CN116293048B

CN116293048B - Large valve servomotor for gas pipeline

Info

Publication number: CN116293048B
Application number: CN202310564813.2A
Authority: CN
Inventors: 张邦柱; 唐磊; 刘家林; 赵胜
Original assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Current assignee: Luzhou Synthetic Hydraulic Parts Co ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-08-04
Anticipated expiration: 2043-05-19
Also published as: CN116293048A

Abstract

The invention relates to a large valve servomotor of a gas pipeline, and belongs to the technical field of valve auxiliary machinery. A large valve servomotor for a gas pipeline comprises a cylinder body with a first cavity and a second cavity. One end of the telescopic piece is positioned between the first cavity and the second cavity, and the other end of the telescopic piece is rotationally connected with the valve body. The housing is mounted on the cylinder and has a first receiving chamber in communication with the first chamber and a second receiving chamber in communication with the second chamber. The shell and the cylinder body are provided with a first liquid conveying channel which is communicated with the second cavity and the inside of the shell. The mounting rod is mounted within the housing. The closing piece is sleeved on the mounting rod. The opening and closing assembly is sleeved on the mounting rod, and the outer wall of the opening and closing assembly and the inner wall of the shell enclose to form a first accommodating cavity and a second accommodating cavity. The opening and closing component is internally provided with an infusion channel communicated with the first accommodating cavity. The inner wall of the infusion channel is provided with a first infusion hole. The elastic piece both ends are installed respectively on the inner wall of casing and the one end that the subassembly was kept away from first holding chamber that opens and shuts.

Description

Large valve servomotor for gas pipeline

Technical Field

The invention belongs to the technical field of valve auxiliary machinery, and particularly relates to a large valve servomotor for a gas pipeline.

Background

The valve is generally installed when the gas pipeline is laid out, so that the gas pipeline is closed during maintenance and overhaul, and the diameters of the gas pipelines are different due to different application amounts of different users to the gas, so that the large-sized pipelines are required to be applied to the large-sized valves to open and close. The large valve needs larger thrust to be opened, so a corresponding servomotor is generally arranged to assist the large valve to be opened or closed.

According to the patent issued by the applicant, the publication number CN216555612U of the large valve servomotor of the gas pipeline is searched, and the large valve servomotor of the gas pipeline comprises a servomotor cylinder body, a pin shaft, a cylinder barrel and a base; the bottom of the servomotor cylinder body is provided with a hinge ring; oil flow channels are respectively formed at the two ends of the pin shaft, and cylinder barrels are sleeved outside the two ends of the pin shaft; annular grooves are formed in positions, corresponding to the oil flow channels, of the cylinder barrels on the two sides, and oil ports are formed in positions, corresponding to the annular grooves, of the cylinder barrels on the two sides; each oil port is respectively connected with a seamless steel pipe, wherein the seamless steel pipe on one side is communicated with a rod cavity of the servomotor cylinder body through a first elbow, and the seamless steel pipe on the other side is communicated with a rod-free cavity of the servomotor cylinder body through a second elbow.

However, the prior art represented by the above patent still has the following technical problems:

it cannot set the pressure in the cylinder barrel, so when the gas valve is rusted or stuck, the following situation occurs: 1. the telescopic rod is forced to extend or retract to drive the gas valve to rotate, so that the gas valve is damaged. 2. The telescopic rod cannot extend and retract, so that the pressure in the cylinder barrel is too high, and cylinder explosion occurs.

Disclosure of Invention

The invention provides a large valve servomotor of a gas pipeline, which is used for solving the technical problems.

In order to achieve the above purpose, the present invention is realized by the following technical scheme: a large valve servomotor for a gas pipeline comprises a cylinder body, a telescopic piece, a shell, a mounting rod, a closing piece, an opening and closing assembly and an elastic piece. The cylinder body is provided with a first cavity and a second cavity which are respectively communicated with the two infusion tubes of the hydraulic pump. One end of the telescopic piece is positioned in the cylinder body and between the first cavity and the second cavity, and the other end of the telescopic piece is rotationally connected with the valve body. The housing is mounted on the cylinder and has a first receiving chamber in communication with the first chamber and a second receiving chamber in communication with the second chamber. The shell and the cylinder body are provided with a first liquid conveying channel which is communicated with the second cavity and the inside of the shell. The mounting rod is mounted within the housing. The closing piece is sleeved on the mounting rod and is positioned in the first accommodating cavity. The opening and closing assembly is sleeved on the mounting rod and slides relative to the mounting rod, and a first accommodating cavity and a second accommodating cavity are formed by surrounding the outer wall of the opening and closing assembly and the inner wall of the shell. The opening and closing component is internally provided with an infusion channel communicated with the first accommodating cavity. The inner wall of the infusion channel is provided with a first infusion hole corresponding to the first liquid feeding channel. The opening and closing assembly slides to a direction close to the first accommodating cavity so as to separate the first liquid conveying channel and the first transfusion hole. And the closure member is inserted into the infusion channel to separate the infusion channel from the first accommodating cavity. The elastic piece both ends are installed respectively on the inner wall of casing and the one end that the subassembly was kept away from first holding chamber that opens and shuts. The elastic piece stretches to drive the opening and closing assembly to move towards the direction close to the first accommodating cavity.

Through the structure, the large valve servomotor of the gas pipeline can set the pressure in the cylinder body, and when the pressure in the cylinder body is higher than the set pressure value, the pressure in the cylinder body is relieved, so that the gas valve is prevented from being damaged due to forced rotation, and the situation that the cylinder body is exploded due to overlarge pressure is prevented. Specifically, when the valve body can normally rotate, the hydraulic pump conveys hydraulic oil into the first cavity through any one of the infusion pipes, so that the hydraulic pressure in the second cavity is lower than that in the first cavity, a pressure difference is formed between the first cavity and the second cavity to enable the telescopic member to retract, and meanwhile the hydraulic oil in the second cavity leaves the second cavity through the other infusion pipe and returns to the hydraulic pump. The hydraulic pump is used for conveying hydraulic oil into the second cavity through the other infusion tube, so that the hydraulic pressure in the first cavity is lower than that in the second cavity, a pressure difference is formed between the first cavity and the second cavity to enable the telescopic piece to stretch, and meanwhile the hydraulic oil in the first cavity leaves the first cavity through any infusion tube and returns to the hydraulic pump. The telescopic piece stretches and retracts to drive the valve body to rotate.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the first cavity through any infusion tube. The hydraulic pressure in the first cavity rises and drives the hydraulic pressure in the first accommodating cavity to rise. Thereby creating a hydraulic pressure differential between the first and second receiving chambers. The hydraulic pressure of the first accommodating cavity is larger than that of the second accommodating cavity, so that the opening and closing assembly overcomes the supporting force of the elastic piece and moves in the direction away from the first cavity, the first liquid conveying channel moves in the direction close to the first liquid conveying hole, and one end of the liquid conveying channel in the first accommodating cavity moves in the direction away from the closing piece. And then the hydraulic pump continuously conveys hydraulic oil into the first cavity through any infusion tube, so that the pressure in the first cavity and the first accommodating cavity is further increased, the opening and closing assembly is driven to continuously move in the direction away from the first cavity, the first liquid conveying channel is communicated with the first infusion hole, the closing piece is separated from the infusion channel, the first accommodating cavity and the second cavity are communicated through the infusion channel, the first liquid conveying channel and the first infusion hole, the first cavity and the second cavity are communicated, hydraulic oil in the first cavity enters the second cavity, the hydraulic pressure in the first cavity is reduced, and the situation that the cylinder body is exploded and the telescopic piece is forcibly retracted to cause damage to the valve body is prevented.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the second cavity through the other infusion tube. The hydraulic pressure in the second cavity rises and drives the hydraulic pressure in the second accommodating cavity to rise. So that the pressure on the inner wall of the second accommodating cavity becomes larger. Therefore, the outer wall of the opening and closing assembly positioned in the second cavity moves in the direction away from the first cavity, and the opening and closing assembly overcomes the supporting force of the elastic piece and moves in the direction away from the first cavity. Thereby the first liquid conveying channel moves towards the direction close to the first liquid conveying hole, and one end of the liquid conveying channel positioned in the first accommodating cavity moves towards the direction far away from the closure piece. And then the hydraulic pump continuously conveys hydraulic oil into the second cavity through the other infusion tube, so that the pressure in the second cavity and the second accommodating cavity is further increased, the opening and closing assembly is driven to continuously move in the direction away from the first cavity, the first liquid conveying channel and the first infusion hole are communicated, the closing piece is separated from the infusion channel, the first accommodating cavity and the second cavity are communicated through the infusion channel, the first liquid conveying channel and the first infusion hole, the first cavity and the second cavity are communicated, hydraulic oil in the second cavity enters the first cavity, the hydraulic pressure in the second cavity is reduced, and the situation that the cylinder body is exploded and the telescopic piece is forcibly stretched out to damage the valve body is prevented.

Optionally, the opening and closing assembly includes a transmission member, a first upper sleeve, and a second upper sleeve. One end of the transmission piece is sleeved outside the mounting rod. An infusion channel is arranged at one end of the transmission piece, which is close to the first accommodating cavity, a first infusion hole which radially penetrates through the transmission piece is arranged on the inner wall of the infusion channel, and the installation rod is inserted into the infusion channel. One end of the elastic piece, which is far away from the inner wall of the shell, is arranged on the transmission piece. The first upper sleeve is sleeved outside one end of the transmission part, which is positioned in the first accommodating cavity. The outer peripheral side of the transmission piece is provided with a first upper boss, and a first upper annular groove corresponding to the first upper boss is arranged in the first upper sleeve. The transmission piece moves towards the direction close to the first accommodating cavity, so that the first upper boss is abutted with the bottom of the first upper annular groove, and the first upper sleeve moves along the direction close to the first accommodating cavity. The second upper sleeve is sleeved outside the first upper sleeve. The outer circumference side of the second upper sleeve is abutted with the inner wall of the shell, and the outer circumference side of the first upper sleeve is provided with a second upper boss. The second upper sleeve is internally provided with a second upper annular groove corresponding to the second upper boss. The first upper sleeve moves towards the direction close to the first accommodating cavity so that the second upper boss is abutted with the bottom of the second upper annular groove, the second upper sleeve moves along the direction close to the first accommodating cavity, and the first accommodating cavity is formed by surrounding the first upper sleeve, the second upper sleeve, the transmission piece, the closing piece and the inner wall of the shell. The design of the first upper sleeve and the second upper sleeve enables an operator to adjust the area of the inner wall of the first accommodating cavity which can move along with the transmission piece by fixing the first upper sleeve and the second upper sleeve relative to the shell, and the larger the area of the inner wall of the first accommodating cavity which can move along with the transmission piece is, the smaller the liquid pressure in the first accommodating cavity is required to move the transmission piece.

Optionally, the opening and closing assembly further comprises a first lower sleeve and a second lower sleeve. The first lower sleeve is sleeved outside the transmission part. The end face of the first lower sleeve, which faces the first accommodating cavity, is positioned in the second accommodating cavity. The outer peripheral side of the transmission piece is provided with a first lower boss, and the first lower sleeve is internally provided with a first lower annular groove corresponding to the first lower boss. The transmission piece moves towards the direction close to the first accommodating cavity, so that the first lower boss is abutted with the bottom of the first lower annular groove, and the first lower sleeve moves along the direction close to the first accommodating cavity. The second lower sleeve is sleeved outside the first lower sleeve. The outer periphery side of the second lower sleeve is abutted with the inner wall of the shell, and the end face of the second lower sleeve, which faces the first accommodating cavity, is positioned in the second accommodating cavity. The outer peripheral side of the first lower sleeve is provided with a second lower boss, and a second lower annular groove corresponding to the second lower boss is arranged in the second lower sleeve. The first lower sleeve moves towards the direction close to the first accommodating cavity so that the second lower boss is abutted with the bottom of the second lower annular groove, and the second lower sleeve moves along the direction close to the second accommodating cavity. The first lower sleeve, the second lower sleeve, the transmission piece and the inner wall of the shell are surrounded to form a second accommodating cavity. The design of the first lower sleeve and the second lower sleeve enables an operator to adjust the area of the inner wall of the second accommodating cavity which can move along with the transmission member by fixing the first lower sleeve and the second lower sleeve relative to the shell, and the larger the area of the inner wall of the second accommodating cavity which can move along with the transmission member is, the smaller the liquid pressure in the second accommodating cavity is required to move the transmission member.

Optionally, the opening and closing assembly further includes an upper positioning member and a lower positioning member. An upper locating hole is formed in the shell, a first upper through hole corresponding to the upper locating hole is formed in the first upper sleeve, a second upper through hole corresponding to the first upper through hole is formed in the second upper sleeve, and an upper blind hole corresponding to the second upper through hole is formed in the transmission piece. One end of the upper locating piece sequentially penetrates through the upper locating hole, the second upper through hole and the first upper through hole and is located in the upper blind hole, so that the transmission piece, the first upper sleeve and the second upper sleeve are fixed relative to the shell. The shell is provided with a lower positioning hole, a first lower through hole corresponding to the lower positioning hole is formed below the first lower sleeve, a second lower through hole corresponding to the first lower through hole is formed below the second lower sleeve, and a lower blind hole corresponding to the second lower through hole is formed below the transmission piece. One end of the lower locating piece sequentially penetrates through the lower locating hole, the second lower through hole and the first lower through hole and is located in the lower blind hole, so that the transmission piece, the first lower sleeve and the second lower sleeve are fixed relative to the shell.

Optionally, a first scale line is formed on the outer peripheral side of the upper positioning member, and the first scale line sequentially increases in a direction approaching the transmission member with zero as a reference. The second scale marks are arranged on the outer peripheral side of the lower locating piece and sequentially increase in the direction approaching the transmission piece by taking zero as a reference. The design of the first scale line and the second scale line enables an operator to know the position relation between one end of the upper locating piece located in the shell and the upper locating hole, the second upper through hole, the first upper through hole and the upper blind hole through the first scale line exposed out of the shell, so that whether the transmission piece, the first upper sleeve and the second upper sleeve are fixed relative to the shell is judged. Meanwhile, an operator can know the position relation between one end of the lower locating piece, which is positioned in the shell, and the lower locating hole, the second lower through hole, the first lower through hole and the lower blind hole through the second scale mark exposed out of the shell, so that whether the transmission piece, the first lower sleeve and the second lower sleeve are fixed relative to the shell is judged.

Optionally, the housing comprises an outer shell and a seal. The shell is installed on the cylinder body, has the first connecting channel of intercommunication first cavity and shell inside and the second connecting channel of intercommunication shell inside and second cavity on shell and the cylinder body. The installation pole coaxial arrangement is in the shell, and first upper sleeve, second upper sleeve, driving medium, closure member and the inner wall of shell enclose to establish and form first accommodation chamber. One end of the first connecting channel is positioned in the first accommodating cavity. The sealing element is arranged in the shell and sleeved outside the transmission element. The sealing element is located between the first upper sleeve and the first lower sleeve, the second lower sleeve, the transmission element and the inner wall of the shell enclose to form a second accommodating cavity. One end of the second connecting channel is positioned in the second accommodating cavity, and the first liquid conveying channel sequentially penetrates through the sealing element, the shell and the cylinder body along the radial direction of the sealing element and is communicated with the second cavity. The first liquid conveying channel is positioned between the first connecting channel and the second connecting channel.

Optionally, the large valve servomotor of the gas pipeline further comprises two limiting blocks. The two limiting blocks are arranged in the cylinder body and distributed along the axis of the cylinder body. One end of the telescopic piece, which is positioned in the cylinder body, is positioned between the two limiting blocks, and the two limiting blocks are positioned between the first connecting channel and the first liquid conveying channel.

Optionally, the large valve servomotor of the gas pipeline further comprises a three-way valve. The sealing piece and the shell are provided with a second liquid conveying channel communicated with the inside and the outside of the shell, and the transmission piece is provided with a second transfusion hole corresponding to the second liquid conveying channel. The transmission piece moves to the direction close to the first accommodating cavity so as to separate the second liquid conveying channel from the second liquid conveying hole. The three-way valve is provided with a liquid inlet channel communicated with the second liquid feeding channel, and a first liquid outlet channel and a second liquid outlet channel communicated with the liquid inlet channel. The three-way valve is respectively communicated with two infusion tubes of the hydraulic pump through the first liquid outlet channel and the second liquid outlet channel.

Optionally, the three-way valve includes a valve housing, a rotary member, a first diaphragm, a second diaphragm, and a valve body. The rotation piece rotates and installs in the valve casing, and the periphery side of rotation piece and the inner wall butt of valve casing. The periphery side of the rotating piece is provided with a first storage groove and a second storage groove along the axial direction of the rotating piece. One end of the first partition plate is arranged on the inner wall of the valve casing, and the other end of the first partition plate is inserted into the first storage groove and is abutted with the bottom of the first storage groove. The first storage groove consists of a first liquid cavity and a first air cavity. The first baffle is located between first liquid chamber and the first gas chamber, and arbitrary transfer line is linked together with first liquid chamber. One end of the second partition board is arranged on the inner wall of the valve shell, and the other end of the second partition board is inserted in the second storage groove and is abutted with the bottom of the second storage groove. The second storage groove consists of a second liquid cavity and a second air cavity, the second partition plate is positioned between the second liquid cavity and the second air cavity, and the other infusion tube is communicated with the second liquid cavity. The valve body is coaxially arranged on the rotating piece, the valve body and the valve shell are provided with a liquid inlet channel, a first liquid outlet channel and a second liquid outlet channel, wherein the first liquid outlet channel is communicated with any infusion tube, the second liquid outlet channel is communicated with another infusion tube, and the valve body rotates relative to the valve shell so as to be communicated with the first liquid outlet channel and separate the second liquid outlet channel or be communicated with the second liquid outlet channel to separate the first liquid outlet channel.

Optionally, the three-way valve further comprises a first baffle and a second baffle. The first baffle is arranged in the first liquid cavity, and the first baffle are respectively positioned at two sides of any infusion tube. The second baffle is arranged in the second liquid cavity, and the second baffle are respectively positioned at two sides of the zero-one infusion tube.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a large valve servomotor of a gas pipeline according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a large valve servomotor for a gas pipeline according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a large valve servomotor for a gas conduit at a second station in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an opening and closing assembly provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a housing provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view of the assembled housing and opening and closing assembly according to the embodiment of the present invention;

FIG. 7 is a cross-sectional view of a large valve servomotor for a gas conduit at a third station according to an embodiment of the present invention;

FIG. 8 is an enlarged view of FIG. 7 at A1;

fig. 9 is an enlarged view at B1 in fig. 7;

FIG. 10 is an enlarged view at C1 of FIG. 7;

FIG. 11 is a cross-sectional view of a large valve servomotor for a gas pipeline at a fourth station according to an embodiment of the present invention;

FIG. 12 is an enlarged view at A2 in FIG. 11;

FIG. 13 is an enlarged view at B2 in FIG. 11;

FIG. 14 is an enlarged view at C2 of FIG. 11;

FIG. 15 is a cross-sectional view of a cylinder and telescoping member assembled in accordance with an embodiment of the present invention;

FIG. 16 is a schematic view of a rotor according to an embodiment of the present invention;

FIG. 17 is a schematic view of a valve body according to an embodiment of the present invention;

FIG. 18 is a partial cross-sectional view of a three-way valve provided by an embodiment of the present invention;

FIG. 19 is a cross-sectional view taken along the path D-D in FIG. 18;

FIG. 20 is a cross-sectional view taken along the path E-E in FIG. 18;

FIG. 21 is a cross-sectional view taken along the path D-D of FIG. 18 with the three-way valve in a second station;

FIG. 22 is a cross-sectional view taken along the path E-E of FIG. 18 with the three-way valve in the second station;

FIG. 23 is a cross-sectional view taken along the path D-D of FIG. 18 with the three-way valve in a third station;

FIG. 24 is a cross-sectional view taken along the path E-E of FIG. 18 with the three-way valve in the third station.

In the figure:

1-a cylinder body; 101-a first cavity; 1011-first connection; 102-a second cavity; 1021-a first liquid feed channel; 1022-a second link; 1023-a second liquid feed channel; 11-limiting blocks; 2-telescoping members; 21-a mounting plate; 3-a housing; 301-a first accommodation chamber; 302-a second accommodation chamber; 31-a housing; 311-upper positioning holes; 312-lower locating holes; 32-a seal; 4-mounting a rod; 41-a closure; 5-an opening and closing assembly; 501-an infusion path; 502-a first infusion hole; 503-a second infusion hole; 504-mounting holes; 51-a transmission member; 511-a first upper boss; 512-first lower boss; 513-upper blind holes; 514-lower blind hole; 52-a first upper sleeve; 521-a first upper ring groove; 522-a second upper boss; 523-first upper via; 53-a second upper sleeve; 531-a second upper ring groove; 532-second upper through holes; 54-a first lower sleeve; 541-a first lower ring groove; 542-a second lower boss; 543-first lower through hole; 55-a second lower sleeve; 551-second lower ring groove; 552-a second lower via; 56-upper positioning piece; 57-lower positioning piece; 6-elastic members; 7-a three-way valve; 701-liquid inlet channel; 702-a first liquid outlet channel; 703-a second liquid outlet channel; 71-a valve housing; 72-rotating member; 721-a first storage tank; 7211-a first fluid chamber; 7212-a first air cavity; 722-a second storage tank; 7221-a second liquid chamber; 7222-a second air chamber; 723-a communication groove; 73-a first separator; 74-valve body; 75-a second separator; 76-a first baffle; 77-a second baffle; 8-a first infusion tube; 81-a second infusion tube.

Detailed Description

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Examples:

In order to solve the above technical problems, the present embodiment provides a large valve servomotor for a gas pipeline, as shown in fig. 1 and 2, which includes a cylinder 1, a telescopic member 2, a housing 3, a mounting rod 4, a closing member 41, an opening and closing assembly 5, and an elastic member 6. It should be noted that the cylinder 1 is rotatably mounted on the ground. The cylinder 1 has a first chamber 101 and a second chamber 102 communicating with two fluid lines of a hydraulic pump, respectively, as shown in fig. 2. For convenience of description, the two infusion pipes of the hydraulic pump are respectively named as a first infusion pipe 8 and a second infusion pipe 81, wherein the first infusion pipe 8 is communicated with the first cavity 101, and the second infusion pipe 81 is communicated with the second cavity 102. The mounting plate 21 is installed on one end of the telescopic member 2, and the mounting plate 21 is located in the cylinder body 1 and located between the first cavity 101 and the second cavity 102 so as to isolate the first cavity 101 and the second cavity 102, and the other end of the telescopic member 2 is rotationally connected with the valve body. The housing 3 is mounted on the cylinder 1 and has a first accommodation chamber 301 communicating with the first chamber 101 and a second accommodation chamber 302 communicating with the second chamber 102. The housing 3 and the cylinder 1 are provided with a first liquid feeding passage 1021 which communicates the second chamber 102 with the interior of the housing 3. The mounting rod 4 is mounted within the housing 3.

The closing member 41 is sleeved on the mounting rod 4 and is positioned in the first accommodating cavity 301. The opening and closing component 5 is sleeved on the mounting rod 4 and slides relative to the mounting rod 4, a first accommodating cavity 301 and a second accommodating cavity 302 are formed by surrounding the outer wall of the opening and closing component 5 and the inner wall of the shell 3, and the outer wall of the opening and closing component 5 in the second accommodating cavity 302 is positioned on the inner wall of the second accommodating cavity 302 far away from the first accommodating cavity 301. The opening and closing assembly 5 is provided with an infusion channel 501 communicated with the first accommodating cavity 301. A first transfusion hole 502 corresponding to the first liquid feeding passage 1021 is formed in the inner wall of the transfusion passage 501. As shown in fig. 2, the opening and closing assembly 5 slides along the direction N3 toward the direction approaching the first accommodating cavity 301, so as to block the first liquid feeding channel 1021 and the first liquid feeding hole 502. And allows the closure member 41 to be inserted into the fluid channel 501 to block the fluid channel 501 from the first receiving chamber 301. The two ends of the elastic piece 6 are respectively arranged on the inner wall of the shell 3 and one end of the opening and closing component 5 away from the first accommodating cavity 301. The elastic member 6 stretches to drive the opening and closing assembly 5 to move along the direction N3 towards the direction approaching the first accommodating cavity 301.

Through the structure, the large-scale valve servomotor of gas pipeline that this embodiment provided can set up the pressure in the cylinder body 1, when the pressure in the cylinder body 1 is higher than the pressure value of settlement, can carry out the pressure release in the cylinder body 1 to prevent to rotate the gas valve by force and produce the damage to the gas valve, and the too big condition that explodes the jar of cylinder body 1 pressure produces. Specifically, when the valve body can be normally rotated as shown in fig. 15, the hydraulic pump delivers hydraulic oil into the first chamber 101 through the first transfer pipe 8, so that the hydraulic pressure in the second chamber 102 is lower than that in the first chamber 101 to create a pressure difference between the first chamber 101 and the second chamber 102 to retract the expansion member 2 in the N2 direction, while allowing the hydraulic oil in the second chamber 102 to leave the second chamber 102 through the second transfer pipe 81 to return to the hydraulic pump. The hydraulic pump delivers hydraulic oil into the second chamber 102 through the second transfer line 81 such that the hydraulic pressure in the first chamber 101 is lower than that in the second chamber 102 to create a pressure differential between the first chamber 101 and the second chamber 102 to extend the telescopic member 2 in the N1 direction while allowing the hydraulic oil in the first chamber 101 to leave the first chamber 101 through the first transfer line 8 and return to the hydraulic pump. The telescopic member 2 is extended in the direction N1 and retracted in the direction N2 to drive the valve body to rotate.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the first cavity 101 through the first infusion tube 8. The hydraulic pressure in the first chamber 101 increases, and the hydraulic pressure in the first accommodation chamber 301 is driven to increase. Thereby creating a hydraulic pressure difference between the first accommodation chamber 301 and the second accommodation chamber 302. Wherein the hydraulic pressure of the first accommodating chamber 301 is greater than that of the second accommodating chamber 302, as shown in fig. 3, so that the opening and closing assembly 5 overcomes the supporting force of the elastic member 6 and moves in the direction away from the first cavity 101 along the direction N4, so that the first liquid feeding channel 1021 moves in the direction close to the first liquid feeding hole 502 and the end of the liquid feeding channel 501 in the first accommodating chamber 301 moves in the direction away from the closing member 41. Then, the hydraulic pump continuously conveys hydraulic oil into the first cavity 101 through the first infusion tube 8, so that the pressure in the first cavity 101 and the pressure in the first accommodating cavity 301 are further increased, the opening and closing assembly 5 is driven to continuously move in the direction away from the first cavity 101 along the direction N4, the first liquid conveying channel 1021 and the first infusion hole 502 are communicated, the closing piece 41 is separated from the infusion channel 501, the first accommodating cavity 301 and the second cavity 102 are communicated through the infusion channel 501, the first liquid conveying channel 1021 and the first infusion hole 502, the first cavity 101 and the second cavity 102 are communicated, the hydraulic oil in the first cavity 101 enters the second cavity 102, the hydraulic pressure in the first cavity 101 is reduced, and the situation that the cylinder body 1 is exploded and the telescopic piece 2 is forcedly retracted, so that the valve body is damaged is prevented.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the second cavity 102 through the second infusion tube 81. The hydraulic pressure in the second chamber 102 increases and drives the hydraulic pressure in the second receiving chamber 302 to increase. So that the pressure applied to the inner wall of the second receiving chamber 302 becomes large. The outer wall of the opening and closing assembly 5 located in the second cavity 102 moves in the direction away from the first cavity 101 along the direction N4, so that the opening and closing assembly 5 overcomes the supporting force of the elastic piece 6 and moves in the direction away from the first cavity 101 along the direction N4. Thereby moving the first fluid delivery channel 1021 in a direction towards the first fluid delivery aperture 502 and moving the end of the fluid delivery channel 501 within the first receiving chamber 301 in a direction away from the closure member 41. Then, the hydraulic pump continues to convey hydraulic oil into the second cavity 102 through the second infusion tube 81, so that the pressure in the second cavity 102 and the pressure in the second accommodating cavity 302 are further increased, the opening and closing assembly 5 is driven to move continuously along the direction N4 away from the first cavity 101, the first liquid conveying channel 1021 and the first infusion hole 502 are communicated, the closing piece 41 is separated from the infusion channel 501, the first accommodating cavity 301 and the second cavity 102 are communicated through the infusion channel 501, the first liquid conveying channel 1021 and the first infusion hole 502, the first cavity 101 and the second cavity 102 are communicated, hydraulic oil in the second cavity 102 enters the first cavity 101, the hydraulic pressure in the second cavity 102 is reduced, and the situation that the cylinder body 1 is exploded and the expansion piece 2 is forcedly stretched out, so that the valve body is damaged is prevented.

Based on the above, in order to be able to adjust the pressure in the first accommodation chamber 301 when the shutter overcomes the movement of the elastic member 6 in the N4 direction. The opening and closing assembly 5 as shown in fig. 4 includes a transmission member 51, a first upper sleeve 52, and a second upper sleeve 53. One end of the transmission member 51 is sleeved outside the mounting rod 4. An infusion channel 501 is arranged at one end of the transmission member 51 close to the first accommodating cavity 301, a first infusion hole 502 penetrating through the transmission member 51 along the radial direction is arranged on the inner wall of the infusion channel 501, and the mounting rod 4 is inserted into the infusion channel 501. The end of the elastic member 6 remote from the inner wall of the housing 3 is mounted on the transmission member 51. The first upper sleeve 52 is sleeved outside one end of the transmission member 51 located in the first accommodating cavity 301. The transmission member 51 has a first upper boss 511 on the outer peripheral side, and the first upper sleeve 52 has a first upper ring groove 521 therein corresponding to the first upper boss 511. The transmission member 51 moves in a direction approaching the first accommodating chamber 301, so that the first upper boss 511 abuts against the bottom of the first upper ring groove 521, and the first upper sleeve 52 moves in a direction approaching the first accommodating chamber 301. The second upper sleeve 53 is sleeved outside the first upper sleeve 52. The outer peripheral side of the second upper sleeve 53 abuts against the inner wall of the housing 3 as shown in fig. 6, and the outer peripheral side of the first upper sleeve 52 has a second upper boss 522 as shown in fig. 4. The second upper sleeve 53 has a second upper ring groove 531 therein corresponding to the second upper boss 522. The first upper sleeve 52 moves toward the first receiving chamber 301 to make the second upper boss 522 abut against the bottom of the second upper ring groove 531, so that the second upper sleeve 53 moves toward the first receiving chamber 301. As shown in fig. 6, the first upper sleeve 52, the second upper sleeve 53, the transmission member 51, the closing member 41 and the inner wall of the housing 3 enclose a first accommodating chamber 301.

Thus, as shown in fig. 11 and 12, the operator can adjust the area of the inner wall of the first accommodation chamber 301 that can move following the transmission member 51 by fixing the first upper sleeve 52 and the second upper sleeve 53 with respect to the housing 3, the larger the area of the inner wall of the first accommodation chamber 301 that can move following the transmission member 51, the smaller the liquid pressure in the first accommodation chamber 301 that is required to move the transmission member 51.

Based on the above, in order to be able to adjust the pressure in the second receiving chamber 302 when the shutter overcomes the movement of the elastic member 6 in the N4 direction. The opening and closing assembly 5 further comprises a first lower sleeve 54 and a second lower sleeve 55 as shown in fig. 4. The first lower sleeve 54 is sleeved outside the transmission member 51. The end surface of the first lower sleeve 54 facing the first accommodation chamber 301 is located in the second accommodation chamber 302. The transmission member 51 has a first lower boss 512 on the outer peripheral side, and the first lower sleeve 54 has a first lower annular groove 541 therein corresponding to the first lower boss 512. The transmission member 51 moves in a direction approaching the first accommodating cavity 301, so that the first lower boss 512 abuts against the bottom of the first lower annular groove 541, and the first lower sleeve 54 moves in a direction approaching the first accommodating cavity 301. The second lower sleeve 55 is sleeved outside the first lower sleeve 54. As shown in fig. 6, the outer peripheral side of the second lower sleeve 55 abuts against the inner wall of the housing 3, and the end surface of the second lower sleeve 55 facing the first accommodation chamber 301 is located in the second accommodation chamber 302. The first lower sleeve 54 has a second lower boss 542 on the outer peripheral side thereof, and the second lower sleeve 55 has a second lower ring groove 551 therein corresponding to the second lower boss 542. The first lower sleeve 54 moves in a direction approaching the first receiving chamber 301 so that the second lower boss 542 abuts against the bottom of the second lower ring groove 551, and the second lower sleeve 55 moves in a direction approaching the second receiving chamber 302. As shown in fig. 6, the first lower sleeve 54, the second lower sleeve 55, the transmission member 51 and the inner wall of the housing 3 enclose a second accommodating cavity 302.

Thus, as shown in fig. 11 and 13, the operator can adjust the area of the inner wall of the second accommodation chamber 302 that can move following the transmission member 51 by fixing the first lower sleeve 54 and the second lower sleeve 55 with respect to the housing 3, the larger the area of the inner wall of the second accommodation chamber 302 that can move following the transmission member 51, the smaller the liquid pressure in the second accommodation chamber 302 that is required to move the transmission member 51.

Based on the above, in order to enable the first and second lower sleeves 54 and 55 and the first and second upper sleeves 52 and 53 to be fixed with respect to the housing 3. The opening and closing assembly 5 further includes an upper positioning member 56 and a lower positioning member 57 as shown in fig. 6. As shown in fig. 4, an upper positioning hole 311 is formed in the housing 3, a first upper through hole 523 corresponding to the upper positioning hole 311 is formed in the first upper sleeve 52, a second upper through hole 532 corresponding to the first upper through hole 523 is formed in the second upper sleeve 53, and an upper blind hole 513 corresponding to the second upper through hole 532 is formed in the driving member 51. As shown in fig. 4, the housing 3 is provided with a lower positioning hole 312, a first lower through hole 543 corresponding to the lower positioning hole 312 is provided under the first lower sleeve 54, a second lower through hole 552 corresponding to the first lower through hole 543 is provided under the second lower sleeve 55, and a lower blind hole 514 corresponding to the second lower through hole 552 is provided under the driving member 51.

It should be noted that the upper positioning member 56 and the lower positioning member 57 may be bolts, and the upper positioning hole 311 and the lower positioning hole 312 may be threaded holes in threaded engagement with the bolts.

Specifically, as shown in fig. 6, one end of the upper positioning member 56 sequentially passes through the upper positioning hole 311, the second upper through hole 532, and the first upper through hole 523, and is located in the upper blind hole 513, so that the transmission member 51, the first upper sleeve 52, and the second upper sleeve 53 are fixed with respect to the housing 3. One end of the upper positioning member 56, which is illustratively shown in fig. 7 and 8, is positioned in the upper positioning hole 311 in the housing 3 so that the transmission member 51, the first upper sleeve 52, and the second upper sleeve 53 can move in the N4 direction with respect to the housing 3. The end of the upper positioning member 56 located in the housing 3 is located in the second upper through hole 532 as shown in fig. 11 and 12 so that the transmission member 51, the first upper sleeve 52 can move in the N4 direction with respect to the housing 3.

One end of the lower positioning member 57 passes through the lower positioning hole 312, the second lower through hole 552 and the first lower through hole 543 in this order as shown in fig. 6, and is located in the lower blind hole 514, so that the transmission member 51, the first lower sleeve 54, and the second lower sleeve 55 are fixed with respect to the housing 3. The end of the lower positioning member 57 located in the housing 3 is located in the lower positioning hole 312 as shown in fig. 7 and 9 so that the transmission member 51, the first lower sleeve 54, and the second lower sleeve 55 can move in the N4 direction with respect to the housing 3. One end of the lower positioning member 57 located in the housing 3 is located in the second lower through hole 552 as shown in fig. 11 and 13 so that the transmission member 51, the first lower sleeve 54, can move in the N4 direction with respect to the housing 3.

Based on the above-described basis. The upper positioning member 56 has a first scale line formed on the outer peripheral side thereof, and the first scale line sequentially increases in a direction approaching the transmission member 51 with zero as a reference. The lower positioning member 57 is provided on the outer peripheral side with second graduation marks which are sequentially increased in a direction approaching the transmission member 51 with reference to zero. In this way, the operator can know the positional relationship between the end of the upper positioning member 56 located in the housing 3 and the upper positioning hole 311, the second upper through hole 532, the first upper through hole 523 and the upper blind hole 513 through the first scale mark exposed out of the housing 3, so as to determine whether the transmission member 51, the first upper sleeve 52 and the second upper sleeve 53 are fixed relative to the housing 3. Meanwhile, an operator can know the position relationship between one end of the lower positioning member 57 positioned in the housing 3 and the lower positioning hole 312, the second lower through hole 552, the first lower through hole 543 and the lower blind hole 514 through the second scale mark exposed out of the housing 3, so as to judge whether the transmission member 51, the first lower sleeve 54 and the second lower sleeve 55 are fixed relative to the housing 3.

Based on the above-described basis. The housing 3 includes a shell 31 and a seal 32 as shown in fig. 5. The housing 31 is mounted on the cylinder 1, and the housing 31 and the cylinder 1 have a first connection passage 1011 communicating the first chamber 101 with the inside of the housing 31 and a second connection passage 1022 communicating the inside of the housing 31 with the second chamber 102. The mounting rod 4 is coaxially mounted in the housing 31, and the first upper sleeve 52, the second upper sleeve 53, the transmission member 51, the closing member 41 and the inner wall of the housing 31 enclose a first accommodating cavity 301. One end of the first connecting channel 1011 is located in the first accommodating cavity 301. The sealing member 32 is installed inside the housing 31 and is sleeved outside the transmission member 51. The sealing member 32 is located between the first upper sleeve 52 and the first lower sleeve 54, the second lower sleeve 55, the transmission member 51, and the inner wall of the housing 31 enclose the sealing member 32 to form a second accommodating chamber 302. One end of the second connecting channel 1022 is located in the second accommodating cavity 302, and the first liquid feeding channel 1021 sequentially penetrates the sealing member 32, the housing 31 and the cylinder 1 along the radial direction of the sealing member 32 and is communicated with the second cavity 102. The first liquid feeding channel 1021 is located between the first connecting channel 1011 and the second connecting channel 1022.

Based on the above-described basis. As shown in fig. 15, the large valve servomotor of the gas pipeline further comprises two limiting blocks 11. Two limiting blocks 11 are installed in the cylinder 1 and distributed along the axis of the cylinder 1. One end of the telescopic member 2 positioned in the cylinder body is positioned between the two limiting blocks 11, and the two limiting blocks 11 are positioned between the first connecting channel 1011 and the first liquid feeding channel 1021. Specifically, when the telescopic member 2 approaches to the first liquid feeding channel 1021 along the direction N2, it will abut against any one of the limiting blocks 11, so that the mounting plate 21 will not block the first liquid feeding channel 1021, and the first liquid feeding channel 1021 and the second cavity 102 will be blocked. When the telescopic member 2 approaches to the first connecting channel 1011 along the direction N1, it will abut against the other stopper 11, so that the mounting plate 21 will not block the first connecting channel 1011, and the first connecting channel 1011 will be blocked from the first cavity 101.

Based on the above, in order to allow the hydraulic pressure to reach the set threshold value, the pressure in the cylinder 1 can be released more quickly. A large valve servomotor for a gas pipeline as shown in fig. 7 and 11 further comprises a three-way valve 7. As shown in fig. 7, the sealing member 32 and the housing 31 are provided with a second liquid feeding channel 1023 communicating the interior of the housing 31 with the outside, and the transmission member 51 is provided with a second liquid feeding hole 503 corresponding to the second liquid feeding channel 1023. The transmission member 51 moves in a direction approaching the first accommodation chamber 301 to block the second liquid feeding path 1023 and the second transfusion hole 503. The three-way valve 7 has a liquid inlet passage 701 communicating with the second liquid feed passage 1023, and a first liquid outlet passage 702 and a second liquid outlet passage 703 communicating with the liquid inlet passage 701. The three-way valve 7 is communicated with the first liquid outlet channel 702 and the first liquid delivery pipe 8, and the second liquid outlet channel 703 is communicated with the second liquid delivery pipe 81. Specifically, as shown in fig. 7 and 11, when the transmission member 51 moves in the direction N4 against the supporting force of the elastic member 6, the first infusion hole 502 and the first liquid feeding path 1021 are communicated with the second infusion hole 503 and the second liquid feeding path 1023, so that the second accommodating chamber 302 is communicated with the liquid feeding path 701 through the first infusion hole 502, the first liquid feeding path 1021, the liquid feeding path 501, the second infusion hole 503 and the second liquid feeding path 1023. At the same time, the closure member 41 is moved away from the fluid pathway 501 such that the first receiving chamber 301 communicates with the fluid inlet pathway 701 through the fluid pathway 501, the second fluid transfer port 503 and the second fluid transfer pathway 1023.

Based on the above-described basis. The three-way valve 7 as shown in fig. 18 includes a valve housing 71, a rotary member 72, a first diaphragm 73, a second diaphragm 75, and a valve body 74. The rotor 72 is rotatably mounted in the valve housing 71, and the outer peripheral side of the rotor 72 abuts against the inner wall of the valve housing 71. As shown in fig. 16, a first storage groove 721 and a second storage groove 722 are formed in the axial direction of the rotor 72 on the outer peripheral side of the rotor 72. As shown in fig. 19, one end of the first diaphragm 73 is attached to the inner wall of the valve housing 71, and the other end of the first diaphragm 73 is inserted into the first storage groove 721 and abuts against the bottom of the first storage groove 721. The first storage tank 721 is composed of a first liquid chamber 7211 and a first air chamber 7212. The first partition 73 is located between the first liquid chamber 7211 and the first gas chamber 7212, and blocks the first liquid chamber 7211 and the first gas chamber 7212. The first infusion tube 8 communicates with the first liquid chamber 7211. One end of the second partition plate 75 is mounted on the inner wall of the valve housing 71, and the other end of the second partition plate 75 is inserted into the second storage groove 722 and abuts against the bottom of the second storage groove 722. The second storage tank 722 is composed of a second liquid cavity 7221 and a second air cavity 7222, a second partition plate 75 is located between the second liquid cavity 7221 and the second air cavity 7222 and cuts off the second liquid cavity 7221 and the second air cavity 7222, and a second infusion tube 81 is communicated with the first liquid cavity 7211. The valve body 74 is coaxially mounted on the rotary member 72 as shown in fig. 18, and the valve body 74 and the valve housing 71 are provided with a liquid inlet passage 701, a first liquid outlet passage 702 and a second liquid outlet passage 703 which are communicated with the liquid inlet passage 701, the first liquid outlet passage 702 is communicated with the first liquid delivery pipe 8, and the second liquid outlet passage 703 is communicated with the second liquid delivery pipe 81 as shown in fig. 20. The valve body 74 rotates in the W2 direction with respect to the valve housing 71 as shown in fig. 24 to communicate with the first fluid passage 702 and to block the second fluid passage 703, and the valve body 74 rotates in the W1 direction with respect to the valve housing 71 as shown in fig. 22 to communicate with the second fluid passage 703 and to block the first fluid passage 702.

As shown in fig. 16, a communication groove 723 is formed in the outer peripheral side of the rotary member 72 to communicate the first air chamber 7212 and the second air chamber 7222.

Specifically, when the hydraulic pump delivers hydraulic oil into the first cavity 101 through the first liquid pipe 8 as shown in fig. 21, the hydraulic oil in the first liquid pipe 8 enters the first liquid cavity 7211 along the direction N6, and the pressure in the first liquid cavity 7211 becomes large, so that the rotating member 72 is driven to rotate along the direction W1, the volume of the first air cavity 7212 becomes small, the volume of the second air cavity 7222 becomes large, the volume of the second liquid cavity 7221 becomes small, the hydraulic oil in the second liquid cavity 7221 enters the second liquid pipe 81 along the direction N8, and the valve body 74 is driven to rotate along the direction W1 to communicate with the second liquid channel 703 and block the first liquid channel 702 as shown in fig. 22. So that the inlet channel 701 communicates with the second infusion tube 81.

When the hydraulic pump delivers hydraulic oil into the second chamber 102 through the second liquid delivery pipe 81 as shown in fig. 23, the hydraulic oil in the second liquid delivery pipe 81 enters the second liquid chamber 7221 along the direction N9, and the pressure in the second liquid chamber 7221 is increased, so that the rotating member 72 is driven to rotate along the direction W2, the volume of the second air chamber 7222 is reduced, the volume of the first air chamber 7212 is increased, the volume of the first liquid chamber 7211 is reduced, the hydraulic oil in the first liquid chamber 7211 enters the first liquid delivery pipe 8 along the direction N7, and the valve body 74 is driven to rotate along the direction W2 to communicate with the first liquid channel 702 and isolate the second liquid channel 703 as shown in fig. 24. So that the inlet channel 701 communicates with the first transfer line 8.

Based on the above, in order to prevent the circumferential side of the rotor 72 from blocking the first liquid chamber 7211 from the first infusion tube 8, and to prevent the circumferential side of the rotor 72 from blocking the second liquid chamber 7221 from the second infusion tube 81. The three-way valve 7 further includes a first flapper 76 and a second flapper 77 as shown in fig. 19. The first baffle 76 is installed in the first liquid chamber 7211, and the first baffle 76 and the first partition 73 are respectively located at both sides of either one of the liquid transfer tubes. The second baffle 77 is installed in the second liquid chamber 7221, and the second baffle 77 and the second baffle 75 are respectively located at both sides of the zero-one infusion tube.

In summary, in the process of closing the valve body, first, as shown in fig. 15, when the valve body can normally rotate, the hydraulic pump delivers hydraulic oil into the first chamber 101 through the first transfer pipe 8, so that the hydraulic pressure in the second chamber 102 is lower than that in the first chamber 101, so that a pressure difference is formed between the first chamber 101 and the second chamber 102 to retract the expansion member 2 in the N2 direction, and simultaneously, the hydraulic oil in the second chamber 102 leaves the second chamber 102 through the second transfer pipe 81 to return to the hydraulic pump. The hydraulic pump delivers hydraulic oil into the second chamber 102 through the second transfer line 81 such that the hydraulic pressure in the first chamber 101 is lower than that in the second chamber 102 to create a pressure differential between the first chamber 101 and the second chamber 102 to extend the telescopic member 2 in the N1 direction while allowing the hydraulic oil in the first chamber 101 to leave the first chamber 101 through the first transfer line 8 and return to the hydraulic pump. The telescopic member 2 is extended in the direction N1 and retracted in the direction N2 to drive the valve body to rotate.

Meanwhile, the operator can adjust the highest pressure in the cylinder 1 by replacing the elastic member 6, and can also adjust the highest pressure in the cylinder 1 by adjusting the relative positions of the upper and lower positioning members 56 and 57 at one end in the housing 31. One end of the upper positioning member 56, which is illustratively shown in fig. 7 and 8, is positioned in the upper positioning hole 311 in the housing 3 so that the transmission member 51, the first upper sleeve 52, and the second upper sleeve 53 can move in the N4 direction with respect to the housing 3. The end of the upper positioning member 56 located in the housing 3 is located in the second upper through hole 532 as shown in fig. 11 and 12 so that the transmission member 51, the first upper sleeve 52 can move in the N4 direction with respect to the housing 3. The end of the lower positioning member 57 located in the housing 3 is located in the lower positioning hole 312 as shown in fig. 7 and 9 so that the transmission member 51, the first lower sleeve 54, and the second lower sleeve 55 can move in the N4 direction with respect to the housing 3. One end of the lower positioning member 57 located in the housing 3 is located in the second lower through hole 552 as shown in fig. 11 and 13 so that the transmission member 51, the first lower sleeve 54, can move in the N4 direction with respect to the housing 3.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the first cavity 101 through the first infusion tube 8. The hydraulic pressure in the first chamber 101 increases, and the hydraulic pressure in the first accommodation chamber 301 is driven to increase. Thereby creating a hydraulic pressure difference between the first accommodation chamber 301 and the second accommodation chamber 302. Wherein the hydraulic pressure of the first accommodating chamber 301 is greater than that of the second accommodating chamber 302, as shown in fig. 3, so that the opening and closing assembly 5 overcomes the supporting force of the elastic member 6 and moves in the direction away from the first cavity 101 along the direction N4, so that the first liquid feeding channel 1021 moves in the direction close to the first liquid feeding hole 502 and the end of the liquid feeding channel 501 in the first accommodating chamber 301 moves in the direction away from the closing member 41. The hydraulic pump then continues to deliver hydraulic oil into the first cavity 101 through the first infusion tube 8, so that the pressure in the first cavity 101 and the pressure in the first accommodating cavity 301 are further increased, and the opening and closing assembly 5 is driven to move continuously along the direction N4 away from the first cavity 101, so that the first liquid delivery channel 1021 and the first infusion hole 502 are communicated, and meanwhile, the closing member 41 is separated from the infusion channel 501, so that the first accommodating cavity 301 and the second cavity 102 are communicated through the infusion channel 501, the first liquid delivery channel 1021 and the first infusion hole 502, so that the first cavity 101 and the second cavity 102 are communicated, and the hydraulic oil in the first cavity 101 enters the second cavity 102.

While second infusion port 503 and second fluid delivery channel 1023 are in communication such that first housing cavity 301 is in communication with fluid inlet channel 701 through infusion channel 501, second infusion port 503 and second fluid delivery channel 1023. When the hydraulic pump delivers hydraulic oil into the first cavity 101 through the first liquid delivery pipe 8 as shown in fig. 21, the hydraulic oil in the first liquid delivery pipe 8 enters the first liquid cavity 7211 along the direction N6, and the pressure in the first liquid cavity 7211 becomes large, so that the rotating member 72 is driven to rotate along the direction W1, the volume of the first air cavity 7212 becomes small, the volume of the second air cavity 7222 becomes large, the volume of the second liquid cavity 7221 becomes small, the hydraulic oil in the second liquid cavity 7221 enters the second liquid delivery pipe 81 along the direction N8, and the valve body 74 is driven to rotate along the direction W1 to communicate with the second liquid channel 703 and isolate the first liquid channel 702 as shown in fig. 22. So that the inlet channel 701 communicates with the second infusion tube 81. Thereby allowing the first chamber 101 to communicate with the second infusion tube 81. So that the hydraulic oil in the first chamber 101 can be returned to the hydraulic pump through the second transfer line 81. So that the hydraulic pressure in the first chamber 101 is reduced to prevent the explosion of the cylinder body 1 and the forced retraction of the telescopic member 2 to damage the valve body.

When the valve body cannot normally rotate due to rust, sliding wires or foreign objects, and the hydraulic pump conveys hydraulic oil into the second cavity 102 through the second infusion tube 81. The hydraulic pressure in the second chamber 102 increases and drives the hydraulic pressure in the second receiving chamber 302 to increase. So that the pressure applied to the inner wall of the second receiving chamber 302 becomes large. The outer wall of the opening and closing assembly 5 located in the second cavity 102 moves in the direction away from the first cavity 101 along the direction N4, so that the opening and closing assembly 5 overcomes the supporting force of the elastic piece 6 and moves in the direction away from the first cavity 101 along the direction N4. Thereby moving the first fluid delivery channel 1021 in a direction towards the first fluid delivery aperture 502 and moving the end of the fluid delivery channel 501 within the first receiving chamber 301 in a direction away from the closure member 41. The hydraulic pump then continues to deliver hydraulic oil into the second cavity 102 through the second infusion tube 81, so that the pressure in the second cavity 102 and the second accommodating cavity 302 further increases to drive the opening and closing assembly 5 to move continuously along the direction N4 away from the first cavity 101, so that the first liquid delivery channel 1021 and the first infusion hole 502 are communicated, and meanwhile, the closing member 41 is separated from the infusion channel 501, so that the first accommodating cavity 301 and the second cavity 102 are communicated through the infusion channel 501, the first liquid delivery channel 1021 and the first infusion hole 502, so that the first cavity 101 and the second cavity 102 are communicated, and the hydraulic oil in the second cavity 102 enters the first cavity 101.

While second infusion port 503 and second fluid delivery channel 1023 are in communication such that second chamber 102 is in communication with fluid intake channel 701 through first fluid delivery channel 1021, first infusion port 502, infusion channel 501, second infusion port 503, and second fluid delivery channel 1023. Meanwhile, as shown in fig. 23, when the hydraulic pump delivers hydraulic oil into the second cavity 102 through the second liquid delivery pipe 81, the hydraulic oil in the second liquid delivery pipe 81 enters the second liquid cavity 7221 along the direction N9, and the pressure in the second liquid cavity 7221 is increased, so that the rotating member 72 is driven to rotate along the direction W2, the volume of the second air cavity 7222 is reduced, the volume of the first air cavity 7212 is increased, the volume of the first liquid cavity 7211 is reduced, the hydraulic oil in the first liquid cavity 7211 enters the first liquid delivery pipe 8 along the direction N7, and the valve body 74 is driven to rotate along the direction W2 to communicate with the first liquid channel 702 and isolate the second liquid channel 703 as shown in fig. 24. So that the inlet channel 701 communicates with the first transfer line 8. So that the second chamber 102 communicates with the first infusion tube 8. So that the hydraulic oil in the second chamber 102 can be returned to the hydraulic pump through the first transfer line 8. So that the hydraulic pressure in the second chamber 102 is reduced to prevent the explosion of the cylinder body 1 and the forced extension of the telescopic member 2, thereby damaging the valve body.

It can be seen from the foregoing that the large valve servomotor for gas pipeline provided in this embodiment can set the pressure in the cylinder 1, and when the pressure in the cylinder 1 is higher than the set pressure value, the pressure in the cylinder 1 is relieved, so as to prevent the gas valve from being damaged due to forced rotation of the gas valve, and the explosion caused by the overlarge pressure in the cylinder 1.

The above description is merely an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present invention, and it is intended to cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A large valve servomotor for a gas pipeline, comprising:

the cylinder body is provided with a first cavity and a second cavity which are respectively communicated with the two infusion tubes of the hydraulic pump;

one end of the expansion piece is positioned in the cylinder body and between the first cavity and the second cavity, and the other end of the expansion piece is rotationally connected with the valve body;

the shell is arranged on the cylinder body and is provided with a first accommodating cavity communicated with the first cavity and a second accommodating cavity communicated with the second cavity, and the shell and the cylinder body are provided with a first liquid conveying channel communicated with the second cavity and the interior of the shell;

A mounting rod mounted within the housing;

the closing piece is sleeved on the mounting rod and is positioned in the first accommodating cavity;

the opening and closing assembly is sleeved on the mounting rod and slides relative to the mounting rod, the outer wall of the opening and closing assembly and the inner wall of the shell are surrounded to form the first accommodating cavity and the second accommodating cavity, an infusion channel communicated with the first accommodating cavity is arranged in the opening and closing assembly, a first infusion hole corresponding to the first liquid conveying channel is formed in the inner wall of the infusion channel, and the opening and closing assembly slides towards the direction close to the first accommodating cavity so as to separate the first liquid conveying channel from the first infusion hole, and the closing piece is inserted into the infusion channel so as to separate the infusion channel from the first accommodating cavity;

and the two ends of the elastic piece are respectively arranged on the inner wall of the shell and one end, far away from the first accommodating cavity, of the opening and closing component, and the elastic piece stretches to drive the opening and closing component to move towards the direction close to the first accommodating cavity.

2. The large valve servomotor of claim 1, wherein said opening and closing assembly comprises:

The transmission piece is sleeved outside the mounting rod at one end, the infusion channel is formed in one end, close to the first accommodating cavity, of the transmission piece, a first infusion hole penetrating through the transmission piece in the radial direction is formed in the inner wall of the infusion channel, the mounting rod is inserted in the infusion channel, and one end, far away from the inner wall of the shell, of the elastic piece is mounted on the transmission piece;

the first upper sleeve is sleeved outside one end of the transmission piece, which is positioned outside one end of the first accommodating cavity, a first upper boss is arranged on the outer peripheral side of the transmission piece, a first upper annular groove corresponding to the first upper boss is arranged in the first upper sleeve, and the transmission piece moves towards the direction close to the first accommodating cavity so as to enable the first upper boss to be abutted with the bottom of the first upper annular groove, so that the first upper sleeve moves along the direction close to the first accommodating cavity;

the second is gone up the sleeve, and the cover is established outside the first sleeve, the second is gone up telescopic periphery side with the inner wall butt of casing, it goes up the boss to have the second on the telescopic periphery side to go up first, have in the second go up the sleeve with the second that the boss corresponds goes up the annular, first upper sleeve is to being close to first accommodation chamber direction motion so that the second goes up the boss with the bottom butt of annular is gone up to the second, so that the second is gone up the sleeve and is followed and is close to first accommodation chamber direction motion, first upper sleeve the second goes up the sleeve the driving medium the closure with the inner wall circumference of casing is established and is formed first accommodation chamber.

3. The large valve servomotor of claim 2, wherein the opening and closing assembly further comprises:

the first lower sleeve is sleeved outside the transmission piece, the end face of the first lower sleeve, which faces the first accommodating cavity, is positioned in the second accommodating cavity, a first lower boss is arranged on the outer peripheral side of the transmission piece, a first lower annular groove corresponding to the first lower boss is arranged in the first lower sleeve, and the transmission piece moves towards the direction close to the first accommodating cavity, so that the first lower boss is abutted with the bottom of the first lower annular groove, and the first lower sleeve moves along the direction close to the first accommodating cavity;

the second lower sleeve is sleeved outside the first lower sleeve, the outer peripheral side of the second lower sleeve is abutted with the inner wall of the shell, the second lower sleeve faces the end face of the first accommodating cavity and is positioned in the second accommodating cavity, a second lower boss is arranged on the outer peripheral side of the first lower sleeve, a second lower annular groove corresponding to the second lower boss is arranged in the second lower sleeve, the first lower sleeve moves towards the direction close to the first accommodating cavity so that the second lower boss is abutted with the bottom of the second lower annular groove, the second lower sleeve moves towards the direction close to the second accommodating cavity, and the first lower sleeve, the second lower sleeve, the transmission piece and the inner wall of the shell are surrounded to form the second accommodating cavity.

4. A gas pipeline large valve servomotor as in claim 3, wherein said opening and closing assembly further comprises:

the upper positioning piece is provided with an upper positioning hole, a first upper sleeve is provided with a first upper through hole corresponding to the upper positioning hole, a second upper sleeve is provided with a second upper through hole corresponding to the first upper through hole, the transmission piece is provided with an upper blind hole corresponding to the second upper through hole, and one end of the upper positioning piece sequentially penetrates through the upper positioning hole, the second upper through hole and the first upper through hole and is positioned in the upper blind hole so that the transmission piece, the first upper sleeve and the second upper sleeve are fixed relative to the shell;

the lower locating piece, set up down the locating hole on the casing, first lower sleeve down seted up with lower locating hole corresponding first lower through-hole, second lower sleeve down seted up with first lower through-hole corresponding second lower through-hole, the driving medium down seted up with second lower blind hole corresponding lower through-hole, the one end of locating piece passes down the locating hole under the second lower through-hole with first lower through-hole in proper order, and be located in the lower blind hole, so that the driving medium first lower sleeve the second lower sleeve is fixed for the casing.

5. The large valve servomotor of claim 4, wherein a first scale line is formed on the outer peripheral side of the upper positioning member, and the first scale line sequentially increases in a direction approaching the transmission member with zero as a reference; and a second scale mark is arranged on the peripheral side of the lower positioning piece, and the second scale mark is sequentially increased in a direction approaching to the transmission piece by taking zero as a reference.

6. The large valve servomotor for a gas pipeline according to claim 5, wherein said housing comprises:

the shell is arranged on the cylinder body, a first connecting channel which is communicated with the first cavity and the interior of the shell and a second connecting channel which is communicated with the interior of the shell and the second cavity are arranged on the shell and the cylinder body, the mounting rod is coaxially arranged in the shell, the first upper sleeve, the second upper sleeve, the transmission piece, the closure piece and the inner wall of the shell are enclosed to form a first accommodating cavity, and one end of the first connecting channel is positioned in the first accommodating cavity;

the sealing element is installed in the shell and sleeved outside the transmission element, the sealing element is located between the first upper sleeve and the first lower sleeve, the second lower sleeve, the transmission element, the inner wall of the shell and the sealing element are surrounded to form a second accommodating cavity, one end of the second connecting channel is located in the second accommodating cavity, and the first liquid conveying channel sequentially penetrates through the sealing element, the shell and the cylinder body along the radial direction of the sealing element and is communicated with the second cavity, and the first liquid conveying channel is located between the first connecting channel and the second connecting channel.

7. The large valve servomotor for a gas pipeline as set forth in claim 6, further comprising:

two limiting blocks are arranged in the cylinder body and distributed along the axis of the cylinder body, one end of the telescopic piece positioned in the cylinder body is positioned between the two limiting blocks, and the two limiting blocks are positioned between the first connecting channel and the first liquid feeding channel.

8. The large valve servomotor for a gas pipeline as set forth in claim 7, further comprising:

the three-way valve, the sealing member with the second liquid conveying channel that communicates inside the shell and external is had on the shell, seted up on the driving medium with the second transfusion hole that corresponds of second liquid conveying channel, the driving medium is to being close to the direction motion of first holding chamber, in order to separate second liquid conveying channel with the second transfusion hole, the three-way valve have with the second liquid conveying channel be linked together the inlet channel with the first liquid outlet channel and the second liquid outlet channel that the inlet channel is linked together, the three-way valve passes through first liquid outlet channel with the second liquid outlet channel respectively with two transfer lines of hydraulic pump are linked together.

9. The large valve servomotor for a gas pipeline according to claim 8, wherein said three-way valve comprises:

A valve housing;

the rotating piece is rotatably arranged in the valve casing, the outer peripheral side of the rotating piece is in contact with the inner wall of the valve casing, and a first storage groove and a second storage groove are formed in the outer peripheral side of the rotating piece along the axial direction of the rotating piece;

one end of the first partition plate is arranged on the inner wall of the valve casing, the other end of the first partition plate is inserted into the first storage groove and is in butt joint with the bottom of the first storage groove, the first storage groove consists of a first liquid cavity and a first air cavity, the first partition plate is positioned between the first liquid cavity and the first air cavity, and any infusion tube is communicated with the first liquid cavity;

one end of the second partition plate is arranged on the inner wall of the valve casing, the other end of the second partition plate is inserted into the second storage groove and is in butt joint with the bottom of the second storage groove, the second storage groove consists of a second liquid cavity and a second air cavity, the second partition plate is positioned between the second liquid cavity and the second air cavity, and the other infusion tube is communicated with the second liquid cavity;

the valve body is coaxially arranged on the rotating piece, the valve body and the valve shell are provided with the liquid inlet channel, a first liquid outlet channel and a second liquid outlet channel, wherein the first liquid outlet channel and the liquid inlet channel are communicated, the first liquid outlet channel is communicated with any one of the liquid conveying pipes, the second liquid outlet channel is communicated with the other liquid conveying pipe, and the valve body rotates relative to the valve shell so as to be communicated with the first liquid outlet channel and separate the second liquid outlet channel, or is communicated with the second liquid outlet channel and separate the first liquid outlet channel.

10. The large valve servomotor for a gas pipeline according to claim 9, wherein said three-way valve further comprises:

the first baffle is arranged in the first liquid cavity, and the first baffle are respectively positioned at two sides of any infusion tube;

the second baffle is arranged in the second liquid cavity, and the second baffle are respectively positioned at two sides of the zero infusion tube.