CN116006703A - Regulator - Google Patents

Abstract

The invention provides a regulator capable of preventing deformation of a valve seat without strict management of dimensional accuracy and very fine assembly. A regulator for reducing a high-pressure fluid to a desired pressure, comprising a main body (10A) having a passage (20) formed therethrough, a pressure reducing chamber (23) formed by dividing the passage (20), an atmospheric pressure chamber (24), a pressure regulating chamber (25), an inlet cover (30), an annular valve seat (100), a valve seat holding portion including a fitting concave portion (26) and a fitting convex portion (33), a piston (50), and a pressure regulating spring (60), wherein the valve seat (100) has an annular groove formed on an inner peripheral surface or an outer peripheral surface thereof.

Description

Regulator

Technical Field

The present invention relates to a piston regulator used when depressurizing a high-pressure fluid to a desired pressure, and more particularly, to a valve seat structure.

Background

Conventionally, a regulator, which is a device for reducing pressure of a high-pressure fluid to a desired pressure, is known, and is used as a pressure regulating device for supplying high-pressure fuel such as CNG (compressed natural gas: compressed natural gas) stored in a fuel tank to an engine, and the method is roughly classified into a diaphragm type and a piston type.

For example, japanese patent application laid-open No. 2007-146875 (patent document 1), japanese patent application laid-open No. 2013-41375 (patent document 2), japanese patent application laid-open No. 2019-67216 (patent document 3) and the like describe a piston type regulator in which the level of the primary pressure applied to the piston and the secondary pressure opposing the primary pressure is adjusted and set to a desired secondary pressure.

Fig. 9 to 11 show an example of a piston type regulator in which one open end of a cylindrical passage 20 formed in a body 10A made of metal, hard synthetic resin, or the like is defined as an input side 21 for high-pressure fluid, the other open end is defined as an output side 22 for pressure-regulated fluid, an inlet cover 30 and an outlet cover 40 are fastened to the input side 21 and the output side 22 by fastening members 32 and 42 such as a stopper screw, respectively, the inlet cover 30 having an inlet 31 for introducing fluid in an airtight state, and the outlet cover 40 having an outlet 41 for taking out fluid in an airtight state.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24, and a pressure regulating chamber 25, the high-pressure fluid introduced from the introduction port 31 is decompressed in the decompression chamber 23, and then regulated to a predetermined pressure in the pressure regulating chamber 25, and discharged from the discharge port 41.

A fitting recess 26 is formed in the input side 21 of the passage 20, the fitting recess 26 has an annular holding piece 27, a cylindrical fitting convex portion 33 is formed on the opposite side of the inlet 31 in the inlet cover 30, a valve seat holding portion is constituted by the fitting recess 26 and the fitting convex portion 33, and an annular valve seat 100 made of an elastic material such as resin or rubber is fitted between the fitting recess 26 and the fitting convex portion 33, and is pressed and held in the axial direction.

On the output side 22 of the passage 20 is provided: a piston 50 including a valve body 51 that is in contact with or separated from the valve seat 100, and disposed slidably in the axial direction in the passage 20, and dividing the pressure reducing chamber 23, the atmospheric pressure chamber 24, and the pressure regulating chamber 25; and a pressure regulating spring 60 that biases the piston 50 toward the output side 22.

In the regulator 3, in order to prevent the floating and offset of the valve seat 100 and the leakage of the fluid due to the tolerance in manufacturing, etc., the length of the fitting convex portion 33 is formed longer than the length of the fitting concave portion 26 minus the thickness of the valve seat 100, and the valve seat 100 is held in a state of being loaded with a predetermined pressure by being pressed by the fitting convex portion 33.

However, in the annular valve seat 100 formed of an elastic material, the outer portion 104 of the seat surface 102 in contact with the valve body 51, which is in contact with the annular retainer 27, is supported by the annular retainer 27 so as not to be deformable, but the inner portion 105 not in contact with the annular retainer 27 is deformable, so that the valve seat 100 may be deformed in the valve body 51 direction by the pressing force of the fitting convex portion 33.

Fig. 11 is a diagram showing a state in which the valve seat 100 is deformed in the direction of the valve body 51 by the pressing force of the fitting protrusion 33, and if such deformation of the seat surface 102 occurs, the contact between the valve seat 100 and the valve body 51 becomes uneven, and there is a possibility that a functional loss due to a leakage defect or the like may occur.

Fig. 12 to 14 show an example of a piston adjuster similar to the example shown in fig. 9 to 11, and the valve seat holding portion for holding the valve seat and the piston are different in structure.

That is, in the regulator 4, the valve seat 110 is held by the disk-shaped valve seat holding member 70 mounted between the inlet cover 30 and the main body 10B, and the piston 80 includes the tubular valve body 81, and the valve body 81 contacts the valve seat 110 to open and close the fluid passage 83.

In the attachment of the valve seat 110 to the valve seat holding member 70, the valve seat 110 is inserted into the valve seat holding hole 71, and the fixing screw 73 having the head 74 having a diameter larger than that of the center hole 111 of the valve seat 100 is screwed into the screw hole 72, whereby the valve seat 110 is held in a state loaded with a predetermined pressure by being pressed by the head 74.

However, with respect to the annular valve seat 110 formed of an elastic material, the outer portion 114 of the seat surface 112, which is not in contact with the head 74, of the seat surface 112 in contact with the valve body 81 is deformed in the direction of the valve body 81 by the tightening force of the set screw 73.

Fig. 14 is a diagram showing a state in which the valve seat 110 is deformed in the direction of the valve body 81 by the fastening force of the fixing screw 74, and if such deformation of the seat surface 112 occurs, the contact between the valve seat 110 and the valve body 81 becomes uneven, and there is a possibility that a functional loss may occur due to a leakage defect or the like.

In the regulator 3 and the regulator 4, if the problem of deformation of the valve seat is to be avoided without changing the component configuration, the dimensional accuracy of each component needs to be strictly controlled, and it takes time and effort to assemble, which results in a problem of increased cost.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 2007-146875

Patent document 2: japanese patent laid-open No. 2013-41375

Patent document 3: japanese patent application laid-open No. 2019-67216

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made to solve the problems of the conventional regulator, and an object of the present invention is to provide a regulator that can prevent deformation of a valve seat without strict management of dimensional accuracy and very fine assembly.

Means for solving the problems

In order to solve the above-described problems, the present invention provides a regulator for reducing a pressure of a high-pressure fluid to a desired pressure, comprising: a main body, a passage penetrating the main body, a decompression chamber, an atmospheric pressure chamber, a pressure regulating chamber, and an annular valve seat formed in this order by dividing the passage from the input side to the output side, the passage having one end as an input side of a fluid and the other end as an output side of the fluid, a center hole formed in the center of the passage at a position closer to the input side than the decompression chamber, a valve seat holding portion for holding the valve seat while being pressed in an axial direction, a piston including a valve body in contact with or separated from the valve seat, the valve body being arranged so as to be slidable in the passage in the axial direction and dividing the decompression chamber, the atmospheric pressure chamber, the pressure regulating chamber, and a pressure regulating spring for biasing the piston toward the output side; the valve seat is formed with an annular groove on an inner peripheral surface or an outer peripheral surface.

According to the above-described invention, the annular groove formed in the valve seat absorbs the pressing force, and the seat surface in contact with the valve body is not deformed, so that deformation of the valve seat can be prevented without requiring strict management of dimensional accuracy and very precise assembly.

Further, an inlet cap having a fluid inlet and a cylindrical fitting protrusion is attached so as to communicate the inlet with an inlet side of the passage, the annular groove is formed on an outer peripheral surface of the valve seat, the fitting protrusion is formed so as to protrude to an opposite side of the inlet, and the valve seat holding portion includes: the fitting convex portion and the fitting concave portion are formed on the input side of the passage, have an inner diameter substantially equal to an outer diameter of the valve seat, and have an annular holding piece formed to protrude inward at an opening end portion in the output side direction; the length of the fitting convex portion is formed longer than the length obtained by subtracting the thickness of the valve seat from the length of the fitting concave portion, and the valve seat is fitted between the fitting concave portion and the fitting convex portion, and is pressed and held, in which case, the valve seat can be reliably held with a relatively simple structure, which is particularly preferable.

Further, when the depth of the annular groove is equal to or greater than the protruding width of the annular retainer, the pressing force can be absorbed by the annular groove more reliably, and the seat surface in contact with the valve body is not deformed.

Furthermore, the piston of the present invention preferably includes: the valve core is contacted with or separated from the valve seat; an inlet-side piston unit that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber; an outlet-side piston unit that divides the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber; and a fluid passage communicating the decompression chamber and the pressure regulating chamber.

The inlet cover having an inlet for fluid is attached so as to communicate the inlet with the inlet side of the passage, the annular groove is formed in the inner peripheral surface of the valve seat, and the valve seat holding portion is a disk-shaped valve seat holding member attached between the inlet cover and the main body, and includes: a valve seat holding hole having an inner diameter substantially corresponding to an outer diameter of the valve seat, a screw hole formed continuously and coaxially with the valve seat holding hole, a set screw formed with a head having a diameter larger than a diameter of a center hole of the valve seat, screwed with the screw hole, and a through hole formed around the valve seat holding hole for passing a fluid therethrough; the valve seat is fitted into the valve seat holding hole, pressed and held by the fixing screw, and in this case, the valve seat can be reliably held with a relatively simple structure, which is particularly preferable.

Further, when the depth of the annular groove is equal to or greater than the protruding width of the head portion of the fixing screw, the pressing force can be absorbed by the annular groove more reliably, and the seat surface in contact with the valve body is not deformed.

Furthermore, the piston in the present invention preferably includes: a valve element that is in contact with or separated from the valve seat and that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber; a piston section dividing the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber; and a fluid passage penetrating through the valve body and communicating the pressure reducing chamber and the pressure regulating chamber.

In addition, it is preferable that the annular groove is formed so as to be parallel to a seat surface in contact with the valve body, and is easy to mold, capable of being appropriately deformed, and easy to absorb a pressing force.

Effects of the invention

According to the present invention, the annular groove formed in the valve seat absorbs the pressing force, and the seat surface in contact with the valve body is not deformed, so that deformation of the valve seat can be prevented without strict management of dimensional accuracy and very precise assembly.

Drawings

Fig. 1 is a sectional view showing a preferred embodiment in the present invention.

Fig. 2 is an enlarged partial cross-sectional view illustrating an assembly process in the embodiment shown in fig. 1.

Fig. 3A and 3B are perspective views showing the valve seat in the embodiment shown in fig. 1, and a perspective view with a part cut away.

Fig. 4A to 4C are partial enlarged sectional views showing a deformation process of the valve seat in the embodiment shown in fig. 1.

Fig. 5 is a cross-sectional view showing a different piston used in the embodiment shown in fig. 1.

Fig. 6 is a cross-sectional view showing different embodiments of the present invention.

Fig. 7 is an exploded cross-sectional view showing the valve seat and the valve seat holding member in the embodiment shown in fig. 6.

Fig. 8A and 8B are explanatory views showing a deformation process of the valve seat in the embodiment shown in fig. 6.

Fig. 9 is a cross-sectional view showing an example of a conventional piston adjuster.

Fig. 10 is a partially enlarged sectional view showing an assembly process in the conventional example shown in fig. 9.

Fig. 11 is a partially enlarged sectional view showing a deformed state of the valve seat in the conventional example shown in fig. 9.

Fig. 12 is a cross-sectional view showing a different example of a conventional piston adjuster.

Fig. 13 is an exploded cross-sectional view showing the valve seat and the valve seat holding member in the conventional example shown in fig. 12.

Fig. 14 is a partially enlarged sectional view showing a deformed state of the valve seat in the conventional example shown in fig. 12.

Description of the reference numerals

1. 2, 3, 4 regulators, 10A, 10B main body, 11 communication hole, 20 passage, 21 input side, 22 output side, 23 depressurization chamber, 24 atmospheric pressure chamber, 25 depressurization chamber, 26 fitting recess, 27 annular holding piece, 30 inlet cover, 31 introduction port, 32 fastener, 33 fitting projection, 40 outlet cover, 41 take-out port, 42 fastener, 43 rod, 50 piston, 51 valve core, 52 inlet side piston portion, 53 outlet side piston portion, 54 fluid passage, 55 sealing member, 56 sealing member, 57 conduction hole, 60 pressure regulating spring, 70 valve seat holding member, 71 valve seat holding hole, 72 screw hole, 73 fixing screw, 74 head, 75 through hole, 80 piston, 81 valve core, 82 piston portion, 83 fluid passage, 84 sealing member, 85 sealing member, 100 valve seat, 101 central hole, 102 seat surface, 103 back surface, 104 outer side portion, 105 inner side portion, 106 outer peripheral surface, 107 annular groove, 110 valve seat, 111 central hole, 112 seat surface, 113 back surface, 114 outer side portion, 115 inner side portion, 116 inner peripheral surface, 117 annular groove, D1 annular groove, depth of depth D2 of annular groove, depth L2, length of the fitting recess, length L2 protruding from the length L, and length L2 protruding from the fitting recess, 1 length L, length of the depth L2 protruding from the annular groove.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 to 4C are diagrams showing a preferred embodiment in the present invention. The same reference numerals are given to the same constituent parts as those of the conventional example shown in fig. 9 to 11, and description will be given.

In the regulator 1, one of the open ends of a tubular passage 20 formed through a body 10A made of metal, hard synthetic resin, or the like is defined as an input side 21 for a high-pressure fluid, the other open end is defined as an output side 22 for the fluid subjected to pressure regulation, an inlet cover 30 and an outlet cover 40 are fastened to the input side 21 and the output side 22 by fastening members 32 and 42 such as stopper screws, respectively, the inlet cover 30 having an inlet 31 for introducing the fluid in an airtight state, and the outlet cover 40 having an outlet 41 for taking out the fluid in an airtight state.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24, and a pressure regulating chamber 25 in this order from the input side 21 to the output side 22, and the high-pressure fluid introduced from the introduction port 31 is decompressed in the decompression chamber 23, and then regulated to a predetermined pressure in the pressure regulating chamber 25 and discharged from the discharge port 41. Further, reference numeral 11 is a communication hole for communicating the atmospheric pressure chamber 24 with the external space of the main body 10A so that the pressure in the atmospheric pressure chamber 24 is equal to the atmospheric pressure.

A fitting recess 26 is formed in the input side 21 of the passage 2, and the fitting recess 26 has an annular holding piece 27 formed to protrude inward at an opening end in the direction of the output side 22.

A cylindrical fitting protrusion 33 is formed on the inlet cover 30 on the opposite side of the inlet 31.

The fitting recess 26 and the fitting protrusion 33 constitute a valve seat holding portion, and an annular valve seat 100 is fitted and held between the fitting recess 26 and the fitting protrusion 33, and the valve seat 100 is formed of an elastic material such as resin or rubber, and has an outer diameter substantially corresponding to the inner diameter of the fitting recess 26 and capable of being inserted into the fitting recess 26.

The valve seat 100 has an annular shape in which a center hole 101 is formed, and has a seat surface 102 that contacts the valve body 51 of the piston 50 and a back surface 103 opposite thereto, and the seat surface 102 on the periphery of the center hole 101 has a chamfer shape (see fig. 3A and 3B).

The outer diameter of the fitting convex portion 33 is formed to be substantially equal to the inner diameter of the fitting concave portion 26 and to be capable of being inserted into the fitting concave portion 26, and the length L1 of the fitting convex portion 33 is formed to be longer than the length L3 obtained by subtracting the thickness T1 of the valve seat 100 from the length L2 of the fitting concave portion 26.

In this way, in order to prevent the floating and offset of the valve seat 100 and the leakage of the fluid due to the tolerance in manufacturing or the like, the length L1 of the fitting convex portion 33 is formed longer than the length L3, whereby the valve seat 100 is pressed by the fitting convex portion 33 and held in a state of being loaded with a predetermined pressure.

A piston 50 and a pressure regulating spring 60 that biases the piston 50 toward the output 22 are provided on the output side 22 of the passage 2, and the piston 50 is disposed in the passage 20 so as to be slidable in the axial direction and divides the pressure reducing chamber 23, the atmospheric pressure chamber 24, and the pressure regulating chamber 25.

The piston 50 includes: a valve body 51 which is in contact with or separated from the valve seat 100; an inlet-side piston portion 52 that divides the pressure reducing chamber 23 and the atmospheric pressure chamber 24 in the passage 20; an outlet-side piston portion 53 that divides the atmospheric pressure chamber 24 and the pressure regulating chamber 25 in the passage 20; and a fluid passage 54 that communicates the pressure reducing chamber 23 and the pressure regulating chamber 25. Further, reference numeral 55 is a sealing member that is fitted over the inlet-side piston portion 52, and reference numeral 56 is a sealing member that is fitted over the outlet-side piston portion 53.

The pressure regulating spring 60 is set to a strength balanced with a pressure load received by the piston 50, is installed in the atmospheric pressure chamber 24, contacts the outlet side piston portion 53 of the piston 50, and biases the main body 10A and the piston 50 in a direction to separate them from each other.

The operation of the regulator having the above-described structure will be described below.

First, when a high-pressure fluid is introduced from the introduction port 31, the fluid flows into the decompression chamber 23 through the center hole 101 formed in the valve seat 100.

At this time, as an initial stage, the piston 50 is pressed by the pressure regulating spring 60, and the valve seat 100 is opened to be separated from the valve body 51, and the fluid flows into the pressure regulating chamber 25 through the fluid passage 54.

Thereafter, as the pressure in the pressure regulating chamber 25 increases due to the fluid flowing into the pressure regulating chamber 25, the piston 50 is pressed toward the inlet side 21, and when the pressure in the pressure regulating chamber 25 reaches a predetermined pressure, the valve seat 100 is brought into contact with the valve body 51, and the inflow of the fluid is shut off.

When the fluid in the pressure regulating chamber 25 is discharged from the discharge port 41 and the pressure in the pressure regulating chamber 25 decreases, the piston 50 is pressed by the pressure regulating spring 60, and the valve seat 100 is returned to the open state separated from the valve body 51.

By repeating the above operation, the pressure of the fluid to be discharged is kept constant by changing the gap area between the valve seat 100 and the valve body 51.

The point different from the regulator 3 shown in fig. 9 to 11 is that an annular groove 107 having a predetermined depth and width toward the center is formed in the outer peripheral surface 106 of the valve seat 100 made of an elastic material such as resin or rubber.

By forming the annular groove 107, when the valve seat 100 is pressed by the fitting protrusion 33 in the axial direction, the annular groove 107 can be deformed by absorbing the pressing force, and thus the deformation of the seat surface 102 can be suppressed.

At this time, the depth D1 of the annular groove 107 is equal to or greater than the protruding width W1 of the annular holding piece 27, whereby the pressing force can be absorbed by the annular groove 107 more reliably, and the seat surface 102 in contact with the valve body 51 is not deformed.

The following describes a deformation process of the valve seat based on fig. 4A to 4C.

First, fig. 4A is a diagram showing a state in which the inlet cover 30 is attached to the main body 10A and is pressed into contact with the back surface 103 of the valve seat 100 by the fitting protrusion 33, and thereafter, by tightening the fastener 32, the whole inlet cover 30 is moved in the direction of the main body 10A, and a pressing force is applied to the valve seat 100 by the fitting protrusion 33.

Fig. 4B is a diagram showing a state in which the fastener 32 is tightened and the installation of the inlet cover 30 is completed, and as shown in this diagram, a wall surface on the seat surface 102 side in the annular groove 107 is curved and deformed so as to be close to the back surface 103 side, whereby the pressing force of the fitting convex portion 33 can be absorbed.

Fig. 4C is a diagram showing a state in which the fastener 32 is tightened and the inlet cap 30 is mounted on the assumption that the length of the fitting convex portion 33 is longer than that of fig. 4B, and as shown in this diagram, the wall surface on the seat surface 102 side in the annular groove 107 is curved and deformed so as to be closer to the rear surface 103 side, whereby the pressing force of the fitting convex portion 33 can be absorbed.

Fig. 5 is a diagram showing an embodiment using a different piston based on the embodiment shown in fig. 1 to 4C, and the overall configuration and operation are substantially the same as those of the embodiment shown in fig. 1 to 4C, but the structures of the piston and the outlet cover are different.

In the present embodiment, a through hole 57 having the same inner diameter as the valve seat diameter is provided in the center axis of the valve body 51, and the rod 43 protruding from the outlet cover 40 is inserted into the through hole 57 in an airtight state, so that the load due to the fuel inlet pressure applied to the piston 50 can be offset, and the pressure at the fuel outlet can be stabilized by the fuel inlet pressure.

Fig. 6 and fig. 8A and 8B are cross-sectional views showing different embodiments of the present invention, and the same components as those of the conventional example shown in fig. 12 to 14 are denoted by the same reference numerals and are described.

In the regulator 2, one of the open ends of a tubular passage 20 formed through a body 10B made of metal, hard synthetic resin, or the like is defined as an input side 21 for a high-pressure fluid, the other open end is defined as an output side 22 for a pressure-regulated fluid, the inlet cover 30 and the outlet cover 40 are fastened to the input side 21 and the output side 22 by fastening members 32 and 42 such as stopper screws, respectively, the inlet cover 30 has an inlet 31 for introducing a fluid in an airtight state, and the outlet cover 40 has an outlet 41 for taking out a fluid in an airtight state.

The passage 20 is divided into a decompression chamber 23, an atmospheric pressure chamber 24, and a pressure regulating chamber 25, the high-pressure fluid introduced from the introduction port 31 is decompressed in the decompression chamber 23, and then regulated to a predetermined pressure in the pressure regulating chamber 24, and discharged from the discharge port 41. Further, reference numeral 11 is a communication hole for communicating the atmospheric pressure chamber 24 with the external space of the main body 10B so that the pressure in the atmospheric pressure chamber 24 is equal to the atmospheric pressure.

A disk-shaped valve seat holding member 70 is attached between the inlet cover 30 and the main body 10B on the input side 21 of the passage 2, and the valve seat 110 is held by the valve seat holding member 70, which is a valve seat holding portion.

The valve seat holding portion 70 includes: a valve seat holding hole 71 having an inner diameter substantially corresponding to an outer diameter of the valve seat 110; a screw hole 72 formed continuously with the valve seat holding hole 71; a set screw 73 having a head 74 formed with a diameter larger than that of a center hole 111 of the valve seat 110 and screwed into the screw hole 72; and a through hole 75 for fluid to pass through.

With respect to the attachment of the valve seat 110 to the valve seat holding member 70, the valve seat 110 is inserted into the valve seat holding hole 71, and the fixing screw 73 having the head 74 having a diameter larger than that of the center hole 111 of the valve seat 110 is screwed into the screw hole 72, whereby the valve seat 110 is held in a state in which a predetermined pressure is applied by being pressed by the head 74.

The valve seat 110 has a ring shape with a center hole 111, and has a seat surface 112 contacting the valve element 81 and a back surface 113 opposite thereto.

The output side 22 of the passage 2 is provided with a piston 80 and a pressure regulating spring 60 for biasing the piston 80 toward the output side, and the piston 80 is disposed slidably in the axial direction in the passage 20 and divides the pressure reducing chamber 23, the atmospheric pressure chamber 24, and the pressure regulating chamber 25.

The piston 80 includes: a valve element 81 that is in contact with or separated from the valve seat 110 and that divides the interior of the passage 20 into the decompression chamber 23 and the atmospheric pressure chamber 24; a piston 82 that divides the interior of the passage 20 into the atmospheric pressure chamber 24 and the pressure regulating chamber 25; a fluid passage 83 penetrating the valve body 81 and communicating the pressure reducing chamber 23 with the pressure regulating chamber 25. Further, reference numeral 84 denotes a sealing member that is externally fitted to the valve element 81, and reference numeral 85 denotes a sealing member that is externally fitted to the piston portion 82.

The pressure regulating spring 60 is set to a strength balanced with a pressure load received by the piston 80, is installed in the atmospheric pressure chamber 24, and contacts the piston portion 82 of the piston 80, and biases the main body 10B in a direction to separate the piston 80 from each other.

The point of difference from the regulator 4 shown in fig. 12 to 14 is that an annular groove 117 is formed in an inner peripheral surface 116 of a valve seat 110 made of an elastic material such as resin or rubber, and the annular groove 117 has a predetermined depth and width toward the center.

By forming the annular groove 117, when the valve seat 110 is pressed by the head 74 of the fixing screw 73 in the axial direction, the annular groove 117 absorbs the pressing force and deforms, whereby the deformation of the seat surface 112 can be suppressed.

At this time, the depth D2 of the annular groove 117 is equal to or greater than the protruding width W2 of the head 74, whereby the pressing force can be absorbed by the annular groove 117 more reliably, and the seat surface 112 in contact with the valve body 81 is not deformed.

The following describes a deformation process of valve seat 110 based on fig. 8A and 8B.

First, fig. 8A is a diagram showing a state in which the set screw 73 is screwed into contact with the seat surface 112 of the valve seat 110 until the head 74 is brought into contact with the seat surface 112, and thereafter, by tightening the set screw 73, the set screw 73 is moved in the depth direction, and a pressing force is applied to the valve seat 110 by the head 74.

Fig. 8B is a diagram showing a state in which the fixing screw 73 is screwed and the fixation of the valve seat 110 is completed, and as shown in this diagram, a wall surface on the seat surface 112 side in the annular groove 117 is curved and deformed so as to be close to the back surface 113 side, whereby the pressing force of the head 74 can be absorbed.

In each embodiment of the present invention, it is preferable that the annular groove formed in the valve seat is formed parallel to the seat surface in contact with the valve body, because the annular groove is easily formed, can be appropriately deformed, and is easily absorbed by the pressing force.

As described above, according to the present invention, the annular groove formed in the valve seat absorbs the pressing force, and the seat surface in contact with the valve body is not deformed, so that the valve seat can be prevented from being deformed without requiring strict management of dimensional accuracy and very precise assembly.

Claims (8)

1. A regulator for reducing pressure of a fluid at a high pressure to obtain a fluid adjusted to a desired pressure, comprising:

the main body is provided with a plurality of grooves,

a passage penetrating the main body, one end being a fluid input side and the other end being a fluid output side,

a decompression chamber, an atmospheric pressure chamber, and a pressure regulating chamber formed in this order by dividing the passage from the input side to the output side,

an annular valve seat located on the input side of the pressure reducing chamber in the passage, a center hole being formed in the center,

a valve seat holding portion for pressing and holding the valve seat in the axial direction,

a piston including a valve body contacting or separating from the valve seat, configured to be slidable in an axial direction in the passage and to divide the decompression chamber, the atmospheric pressure chamber, the pressure regulating chamber, and

a pressure regulating spring that biases the piston toward the output side;

the valve seat is formed with an annular groove on an inner peripheral surface or an outer peripheral surface.

2. A regulator according to claim 1, characterized in that,

an inlet cover having a fluid inlet and a cylindrical fitting projection formed so as to project toward the opposite side of the inlet is attached so as to communicate the inlet with the inlet side of the passage, and the annular groove is formed on the outer peripheral surface of the valve seat,

the valve seat holding portion includes:

the fitting convex part, and

a fitting recess formed on the input side of the passage, having an inner diameter substantially equal to an outer diameter of the valve seat, and having an annular holding piece formed to protrude inward at an opening end in the output side direction;

the length of the fitting convex portion is longer than the length obtained by subtracting the thickness of the valve seat from the length of the fitting concave portion,

the valve seat is fitted between the fitting concave portion and the fitting convex portion, and is pressed and held.

3. The adjuster according to claim 2, wherein the depth of the annular groove is above the protruding width of the annular retaining tab.

4. A regulator according to claim 2 or 3, characterized in that,

the piston includes:

the valve core is contacted with or separated from the valve seat;

an inlet-side piston unit that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;

an outlet-side piston unit that divides the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber; and

and a fluid passage communicating the decompression chamber and the pressure regulating chamber.

5. A regulator according to claim 1, characterized in that,

an inlet cover having an inlet for fluid is attached so as to communicate the inlet with the inlet side of the passage, and the annular groove is formed on the inner peripheral surface of the valve seat,

the valve seat holding portion is a disk-shaped valve seat holding member mounted between the inlet cover and the main body, and includes:

a valve seat holding hole having an inner diameter substantially corresponding to an outer diameter of the valve seat,

a screw hole formed continuously and coaxially with the valve seat holding hole,

a fixing screw having a head with a diameter larger than that of the central hole of the valve seat, screwed with the screw hole, and

a through hole formed around the valve seat holding hole for fluid to pass through;

the valve seat is fitted into the valve seat holding hole, pressed and held by the set screw.

6. The adjuster as set forth in claim 5 wherein the depth of said annular groove is above the protruding width of the head of said set screw.

7. A regulator according to claim 5 or 6, characterized in that,

the piston includes:

a valve element that is in contact with or separated from the valve seat and that divides the interior of the passage into the decompression chamber and the atmospheric pressure chamber;

a piston section dividing the interior of the passage into the atmospheric pressure chamber and the pressure regulating chamber; and

and a fluid passage formed through the valve body and communicating the pressure reducing chamber and the pressure regulating chamber.

8. The regulator according to any one of claims 1 to 7, wherein the annular groove is formed in parallel with respect to a seat surface in contact with the spool.

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