CN218563782U - Ejector - Google Patents

Abstract

The utility model provides an ejector, which comprises an ejector body; a moving member movable in an axial direction of the injector body and including an armature at least partially disposed within the receiving chamber and a conduit body having a proximal end connected to the armature; the first reset assembly is arranged in the ejector body and comprises a limiting part and a second elastic part; the limiting part is arranged on the proximal end side of the accommodating cavity and keeps axially and relatively static with the injector body, and the second elastic piece is arranged between the moving part and the limiting part; and the needle valve can move along the axial direction of the injector body so as to enable the far end part of the injector body to be in an opening state or a blocking state, a stop block is formed at the near end of the needle valve, and the near end face of the stop block is used for being in contact with or separated from the far end face of the catheter body. The ejector has good use performance.

Description

Ejector

Technical Field

The utility model relates to an internal-combustion engine technical field specifically is to relate to an ejector.

Background

One prior art injector 100 for combustible fluid media is shown in fig. 1. The injector 100 includes a hollow injector body 110, an armature 120, a reset assembly 130, and a needle 140. An annular accommodating cavity (not labeled in the figures) is formed on the inner wall of the injector body 110, the armature 120 is at least partially arranged in the accommodating cavity, the armature 120 can move in the accommodating cavity along the axial direction, and the armature 120 further has an inner hole 121 which penetrates through the axial direction. The reset assembly 130 includes a movable seat 131 and a reset elastic member 132, the movable seat 131 is movably disposed in the injector body 110 and located below the armature 120, and a second fluid hole 133 is disposed on the movable seat 131. The upper end of the elastic return element 132 is connected to the lower end of the movable seat 131, and the lower end of the elastic return element 132 is connected to the inner wall of the injector body 110. The upper end of needle valve 140 with armature 120 connects, just the upper end part of needle valve 140 still has fluid passage 141, just be formed with on the lateral wall of needle valve 140 with the first fluid hole 142 of fluid passage 141 intercommunication, the lower extreme of needle valve 140 passes the sliding seat 131, just needle valve 140 still with sliding seat 131 synchronous motion. The lower end of the needle 140 forms a sealing portion 143, the sealing portion 143 is at least partially located outside the injector body, and an upper end surface of the sealing portion 143 is a slope for abutting against a lower end surface of the injector body 110.

In operation, a combustible fluid medium enters the injector body 110 from the upper end, and flows along the interior cavity of the injector body 110 into the bore 121, then into the fluid passageway 141, then out of the first fluid bore 142, and again into the interior cavity of the injector body 110, and then flows through the second fluid bore 133 and subsequently to the lower end of the interior cavity of the injector body 110. At the same time, the armature 120 moves downward under the action of the electromagnetic force to drive the needle 140 to move downward, and the upper end face of the sealing portion 143 is separated from the lower end face of the injector body 110, thereby allowing the combustible fluid medium to be ejected from the lower end of the injector body 110. When the armature 120 hits the lower end side wall of the accommodation hole, the armature 120 stops moving downward, and during the downward movement of the armature 120, the needle valve 140 also drives the movable seat 131 to move downward to press the return elastic member 132, and the return elastic member 132 deforms and stores elastic potential energy. When the operation needs to be stopped, the electromagnetic force is cancelled, and the return elastic member 132 releases elastic potential energy to push the movable seat 131 to move upward and drive the needle valve 140 to move upward until the upper end face of the sealing portion 143 contacts with the lower end face of the injector body 110 and collides with the lower end face, in which process, the needle valve 140 pushes the armature 120 to move upward. The movement stroke from the initial position to the time when the lower end of the armature 120 and the lower end face of the accommodating cavity move is the axial stroke of the needle valve 140.

When the injector 100 is operated for a long time, the long-term collision of the armature 120 with the lower end face of the receiving chamber causes the lower end face of the receiving chamber to be worn, thereby increasing the axial stroke of the needle valve 140, which causes the distance that the sealing portion 143 of the needle valve moves downward to be increased when the injector 100 is operated, resulting in an increase in the flow area between the lower end face of the injector body 110 and the upper end face of the sealing portion 143. In addition, the lower end surface of the injector 100 is worn by multiple impacts, and the distance between the upper end surface of the seal portion 143 and the lower end surface of the injector 110 is further increased, thereby further increasing the flow area of the fluid. This will cause deviation of the actual flow rate of the injector 100 from the set flow rate, causing problems of insufficient combustion, chattering, excessive gas consumption, slow needle valve opening response, etc. in the internal combustion engine.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an ejector aims at solving the increase of the needle valve stroke that the long-term operation of ejector arouses, and then leads to the actual flow of ejector to be greater than the various problems that set for the flow and cause.

To achieve the above object, the present invention provides an injector having axially opposed proximal and distal ends, the injector comprising:

the inner wall of the injector body is provided with an accommodating cavity;

a moving member movable in an axial direction of the injector body and including an armature at least partially disposed in the accommodation chamber and a conduit body having a proximal end connected to the armature;

the first reset assembly is arranged in the ejector body and comprises a limiting part and a second elastic part; the limiting part is arranged on the proximal end side of the accommodating cavity and keeps axially and relatively static with the injector body, and the second elastic piece is arranged between the moving part and the limiting part; and the number of the first and second groups,

the needle valve can move along the axial direction of the injector body so as to enable the far end part of the injector body to be in an opening state or a blocking state, a stop block is formed at the near end of the needle valve, and the near end face of the stop block is used for being in contact with or separated from the far end face of the catheter body.

Optionally, the catheter body comprises a tube body and a first abrasion part, wherein the proximal end of the tube body is connected with the armature, the distal end of the tube body is connected with the first abrasion part, and the distal end face of the first abrasion part is used for contacting with or separating from the proximal end face of the stopper.

Optionally, the material of the stopper is austenitic stainless steel or martensitic stainless steel.

Optionally, the needle valve includes a needle body, the stopper includes a joint portion and a second wear portion, the joint portion is connected with the needle body, the second wear portion is connected with the joint portion, and a proximal end face of the second wear portion is used for contacting with or separating from a distal end face of the catheter body.

Optionally, the injector further comprises a second reset assembly, the second reset assembly is arranged at the distal end side of the accommodating cavity and comprises a movable seat and a first elastic piece, the proximal end of the first elastic piece is connected with the movable seat, and the distal end of the first elastic piece abuts against the inner wall of the injector body; the movable seat can move along the axial direction of the injector body, and an avoidance hole is formed in the movable seat;

the far end of the needle valve penetrates through the avoidance hole, and the stop block is in contact with the end face of the near end of the movable seat.

Optionally, the distal end of the needle valve further forms a seal portion that is located at least partially outside the injector body, and a proximal end face of the seal portion is in contact with or separated from a distal end face of the injector body.

Optionally, the first resilient member has a stiffness greater than a stiffness of the second resilient member.

Optionally, the axial length of the armature is smaller than the axial length of the accommodating cavity, and a protrusion protruding from a proximal end of the armature is formed on the moving component, and a proximal end face of the protrusion is configured to abut against a distal end of the second elastic member.

Optionally, the injector body comprises an inner support rod; the inner support rod comprises a first section and a second section which are axially connected, the inner diameter of the first section is larger than that of the second section, so that a step surface is formed on the inner wall of the inner support rod, and the step surface forms a far end side wall of the accommodating cavity.

Compared with the prior art, the utility model discloses an ejector has following advantage:

the injector comprises a hollow injector body, a moving part, a first reset assembly and a needle valve, wherein the hollow injector body is provided with a proximal end and a distal end which are axially opposite; the injector body is of a hollow structure, and an accommodating cavity is formed in the inner wall of the injector body; the moving part is capable of moving along the axial direction of the injector body and comprises an armature and a conduit body, the armature is at least partially arranged in the accommodating cavity, and the proximal end of the conduit body is connected with the armature; the first reset component is arranged in the injector body and comprises a limiting part and a second elastic piece, the limiting part is arranged at the proximal end side of the armature and keeps axially relative to the injector body to be static, and the second elastic piece is arranged between the moving part and the limiting part; the needle valve can move along the axial direction of the injector body so as to enable the far end part of the injector body to be in an opening state or a closing state, a stop block is formed on the near end of the needle valve, and the near end face of the stop block is used for being in contact with or separated from the moving end face of the guide pipe body. In more detail, the injector further comprises a second reset assembly, wherein the second reset assembly is arranged at the far end side of the accommodating cavity and comprises a movable seat and a first elastic piece, the near end of the first elastic piece is connected with the movable seat, and the far end of the first elastic piece is abutted against the inner wall of the injector body; the movable seat can move along the axial direction of the injector body, and an avoidance hole is formed in the movable seat; the far end of the needle valve penetrates through the avoidance hole, and the stop block is in contact with the end face of the near end of the movable seat; the distal end of the needle valve also forms a seal portion that is located at least partially outside the injector body, and a proximal end face of the seal portion is in contact with or separated from a distal end face of the injector body. The arrangement is that not only the impact of the armature and the far end side wall of the containing cavity and the impact of the sealing part and the far end of the injector body, but also the impact of the far end of the guide pipe body and the near end of the stop block occur in the injector in the long-term operation process, wherein the axial stroke of the needle body and the sealing part is increased due to the abrasion caused by the impact of the armature and the far end side wall of the containing cavity, and further the fluid flow area of the injector is increased due to the impact of the sealing part and the far end face of the injector body, and the axial stroke of the needle body and the sealing part is reduced due to the abrasion caused by the impact of the guide pipe body and the near end of the stop block, so that the abrasion caused by the impact of the guide pipe body and the near end of the stop block on the far end side wall of the armature and the far end face of the sealing part and the injector body is compensated, and the fluid flow area of the injector in the operation is kept in a preset range, and the normal performance of the injector is maintained.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

FIG. 1 is a schematic diagram of an injector provided in the prior art;

fig. 2 is a schematic structural view of an injector provided according to an embodiment of the present invention;

fig. 3 is a schematic view of a catheter body provided in accordance with an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a stopper according to an embodiment of the present invention;

fig. 5 is a schematic view illustrating a fitting relationship between a guide tube body and a stopper of the needle valve according to an embodiment of the present invention.

[ reference symbols are explained below ]:

100. 1000-injector, 110, 1100-injector body, 1110-nipple, 1120-inner support rod, 1121-first section, 1122-second section, 1130-valve sleeve, 1131-step face, 1200-moving part, 120, 1210-armature, 121-inner bore, 1210-body, 1220-conduit body, 1230-projection, 130-reset component, 131, 1310-movable seat, 1311-relief bore, 132-reset spring, 133, 1311-second fluid bore, 140, 1400-needle valve, 141-fluid channel, 142, 1211-first fluid bore, 143, 1430-seal, 1320-first spring, 1330-limit, 1340-second spring, 1212-tube body, 1213 first wear, 1410-needle body, 1420-stop, 1421-joint, 1422-second wear, 1500-magnetic sleeve, 1600-electromagnetic coil, 1700-gland,

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the invention in a schematic manner, and only the components related to the invention are shown in the drawings rather than being drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of the components in actual implementation may be changed at will, and the layout of the components may be more complicated.

Furthermore, each embodiment described below has one or more technical features, and this does not mean that all the technical features in any embodiment need to be implemented simultaneously by using the present invention, or that only some or all the technical features in different embodiments can be implemented separately. In other words, based on the disclosure of the present invention, and according to design specifications or practical requirements, a person skilled in the art can selectively implement some or all of the technical features of any embodiment or selectively implement a combination of some or all of the technical features of a plurality of embodiments, thereby increasing the flexibility of the implementation of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixedly connected, releasably connected, abutted, or integrally connected. Either mechanically or electrically. They may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

To make the objects, advantages and features of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention. The same or similar reference numbers in the drawings identify the same or similar elements.

Fig. 2 is a schematic structural diagram of an injector 1000 according to an embodiment of the present invention. As shown in FIG. 2, the injector 1000 has axially opposite proximal and distal ends, and the injector 1000 includes an injector body 1100, a moving assembly 1200, a first reset assembly, and a needle valve 1400. The injector body 1100 is a hollow structure, and an accommodating cavity (not labeled) is formed on an inner wall of the injector body 1100. The moving member 1200 is movable in the axial direction of the injector body 1100, and includes an armature 1210 and a tube body 1220, the armature 1210 being at least partially disposed in the accommodation chamber, and a proximal end of the tube body 1220 being connected to the armature 1210. The first reset assembly 1300 is disposed in the injector body 1100 and includes a stopper 1330 and a second elastic member 1340. The stopper 1330 is provided on the proximal side of the receiving cavity and is held axially stationary relative to the injector body 1100. The second elastic member 1340 is disposed between the stopper portion 1330 and the armature 1210. The needle valve 1400 is movable in the axial direction of the injector body 1100 to place the distal end of the injector body in an open state or a closed state, and a stopper 1420 is formed at the proximal end of the needle valve 1400, and the proximal end surface of the stopper 1420 is adapted to be brought into contact with or separated from the distal end surface of the guide tube 1410.

Further, the injector 1000 further includes a second reset assembly including a movable seat 1310 and a first elastic member 1320. The movable seat 1310 is provided on the distal end side of the housing chamber and is movable in the axial direction of the injector body 1100. The movable seat 1310 is provided with a relief hole 1311. A proximal end of the first elastic member 1320 is coupled to the movable seat 1310, and a distal end of the first elastic member 1320 is coupled to an inner wall of the injector body 1100. The needle valve 1400 includes a needle body 1410, the stopper 1420 is disposed at a proximal end of the needle body 1410, and a distal end of the needle body 1410 passes through the avoiding hole 1311, so that the stopper 1420 is in end-face contact with a proximal end of the movable seat 1310. In addition, the needle valve further includes a sealing portion 1430, the sealing portion 1430 is connected to a distal end of the needle body 1410 and is at least partially located outside the injector body 1100, and a proximal end surface of the sealing portion 1430 is configured to be in contact with or separated from a distal end surface of the injector body 1100.

It should be noted that, in the present embodiment, the reference to "proximal end" and "distal end" is a set of relative concepts, which indicates the relative orientation, relative position, and direction of each element or action of the injector 1000. Although "proximal" and "distal" are not intended to be limiting, as used herein, "proximal" and "distal" are defined in terms of the direction of flow of the combustible fluidic medium ejected from the injector 1000. In the embodiment described herein, the combustible fluidic medium enters the injector 1000 from the proximal end and exits the injector 1000 from the distal end.

It will be appreciated that the injector 1000 is in an initial state when the injector is in a non-operational state. When the injector 1000 is in the initial state, the distal end face of the catheter body 1220 abuts the proximal end face of the stopper 1420, and the proximal end face of the seal 1430 abuts the distal end face of the injector body 1100, so that the seal 1430 seals the distal end of the injector body 1100 (i.e., the distal end of the injector body 1100 is in a sealed state). The proximal end face of the sealing portion 1430 is preferably beveled.

When the injector 1000 starts to operate, the armature 1210 moves in a proximal-to-distal direction under the action of electromagnetic force, and drives the conduit 1220 to move in a proximal-to-distal direction, so as to drive the stopper 1420 to move in a proximal-to-distal direction, and the stopper 1420 drives the needle 1410 and the sealing portion 1430 to move in a proximal-to-distal direction, so that the proximal end surface of the sealing portion 1430 is separated from the distal end surface of the injector body 1100, so that the distal end portion of the injector body 1100 is in an open state, and a fluid outlet is formed between the sealing portion 1430 and the sidewall of the injector body 1100. During the process of the stopper 1420 moving in the proximal direction and the distal direction, the stopper 1420 also drives the movable seat 1310 to move in the proximal direction and the distal direction, and presses the first elastic member 1320, so that the first elastic member 1320 deforms and stores elastic potential energy.

When the distal end face of the armature 1210 impacts the distal side wall of the receiving chamber, the armature 1210 and the catheter body 1220 do not continue to move in the proximal-to-distal direction, and the fluid flow area of the fluid outlet reaches a maximum. The electromagnetic force is then maintained, so that the proximal end surface of the sealing portion 1430 is separated from the distal end surface of the injector body 1100, and the injector 1000 continues to operate.

The combustible fluid medium flows into the injector 1000 from the proximal end of the injector body 1100, then passes through the armature 1210, the conduit body 1220, the movable seat 1310, and finally reaches the distal end of the injector body 1100, and exits the injector 1000 from the fluid outlet.

When the injector 1000 needs to close the fluid outlet to finish the operation, the process is as follows: the electromagnetic force is removed, such that the first elastic member 1320 releases the elastic potential energy and drives the movable seat 1310 to move in a distal-to-proximal direction, and the stopper 1420 is driven to move in a distal-to-proximal direction by the movable seat 1310. Thus, the needle 1410 and the sealing portion 1430 move in a distal-to-proximal direction under the urging of the stop 1420, and the tube 1410 and the armature 1210 also move in a distal-to-proximal direction under the urging of the stop 1420. When the proximal end face of the sealing portion 1430 impinges upon the distal end face of the injector body 1100 and closes the fluid outlet, the sealing portion 1430 is blocked by the distal end face of the injector body 1100 from continuing to move in the distal-to-proximal direction while the stop 1420 is also restrained from moving in the distal-to-proximal direction. At this time, the proximal end of the armature 1210 abuts against the second elastic member 1340, and the catheter body 1410 and the armature 1210 continue to move in the distal-to-proximal direction under the action of inertia, so that the moving member 1200 presses the second elastic member 1440, and the second elastic member 1440 stores elastic potential energy. When the armature 1210 impacts the proximal sidewall of the receiving chamber, the armature 1210 is constrained by the proximal sidewall of the receiving chamber and the moving member 1220 does not continue to move in the distal-to-proximal direction. Subsequently, the second resilient member 1440 releases its elastic potential and drives the moving member 1200 proximally and distally until the distal end surface of the catheter body 1220 hits the proximal end surface of the stop 1420. At this point, the process of closing the fluid outlet is finished, the injector 1000 is finished operating, and the initial state is returned.

During the above operation, the distal end face of the armature 1210 collides with the distal side wall of the receiving chamber, causing the distal side wall of the receiving chamber to wear by an amount referred to as a first wear amount. The proximal end face of the seal 1430 collides with the distal end face of the injector body 1100, causing the proximal end face of the seal 1430 and/or the distal end face of the injector body 1100 to wear by an amount referred to as a second wear amount. And, the distal end surface of the catheter body 1220 collides with the proximal end surface of the stop 1420, causing the distal end surface of the catheter body 1220 and/or the proximal end surface of the stop 1420 to wear, which is referred to as a third amount of wear. The first amount of wear causes an increase in the axial travel of the needle 1410 and the seal 1430 such that the maximum value of the fluid flow area at the fluid outlet increases when the proximal end face of the seal 1430 is moved away from the distal end face of the injector body 1100 to form the fluid outlet. The second amount of wear causes the distance between the proximal end face of the seal 1430 and the distal end face of the injector body 1100 to further increase in operation of the injector 1000, also causing an increase in the maximum value of the fluid flow area at the fluid outlet. And the third amount of wear results in a reduction in the axial travel of the needle 1410 and the seal 1430, which reduces the maximum value of the fluid flow area of the proximal end face of the seal 1430 away from the distal end face of the injector body 1100 that forms the fluid outlet. That is, the result of the third wear amount is opposite to the result of the first wear amount and the second wear amount, and the two wear amounts can at least partially cancel each other, which is beneficial for keeping the maximum value of the fluid flow area at the fluid outlet within a set range, and especially when the third wear amount is equal to the sum of the first wear amount and the second wear amount, the fluid flow area at the fluid outlet can be maintained at the set maximum value, so that the usability of the injector 1000 is ensured, and the problems of insufficient combustion of the internal combustion engine, shaking, excessive air consumption, slow needle valve opening response and the like are avoided. Furthermore, since the needle valve of the prior art is an integral component (as shown in fig. 1) which is directly connected to the armature and cannot compensate for the wear of the side wall of the receiving chamber and the wear of the sealing portion and the injector body due to the impact wear of the internal parts of the needle valve, the surface hardness of the impact surface is required to be extremely high in order to reduce the wear of the impact surface, and the impact surface is usually required to be hardened. In the solution provided in this embodiment, by providing the split type conduit body 1220 and the needle valve 1400, the fluid flow area change caused by the collision between the conduit body 1220 and the stopper 1420 of the needle valve 1400 (i.e., the collision between the distal end surface of the armature 1210 and the distal end sidewall of the receiving chamber, and the collision between the proximal end surface of the sealing portion 1430 and the distal end surface of the injector body 1100) is compensated, so as to reduce the hardness requirement for the collision surface, simplify the production process to a certain extent, and reduce the cost. And, in order to prevent the increase of the lift of the needle valve 1400 caused by the impact between the distal end surface of the armature 1210 and the distal end sidewall of the receiving cavity, which leads to the decrease of the attraction force of the electromagnetic force to the armature 1210, a certain margin of the electromagnetic force needs to be reserved when designing the magnetic circuit. The injector provided by the embodiment compensates the change of the axial stroke of the needle body 1410 and the sealing part 1430 through the collision of the guide tube body 1220 and the stop block 1420, so that the suction force change caused by the change of the stroke of the needle valve can be reduced or even eliminated, the arrangement of a magnetic circuit is simplified, the size of parts is reduced, and the overall size of the injector is reduced.

In this embodiment, the third amount of wear can be matched to the sum of the first amount of wear and the second amount of wear by appropriate selection of the material of the distal portion of the catheter body 1220 and appropriate selection of the material of the proximal portion of the stop 1420.

For example, wear caused by the impact of the catheter body 1212 and the stop 1420 may only occur on the catheter body 1220. Here, as shown in fig. 3, the catheter body 1220 includes a tube body 1212 and a first abrasion portion 1213, a proximal end of the tube body 1212 is connected to the armature 1210, and a distal end of the tube body 1212 is connected to the first abrasion portion 1213. As such, the distal end of the first abrasion portion 1213 is the distal end of the catheter body 1410, i.e., the distal end of the first abrasion portion 1213 is adapted to contact or separate from the stopper 1420. The first wear portion 1213 has a relatively low hardness and is prone to wear. The material of the first wear portion 1213 includes, but is not limited to, austenitic stainless steel or martensitic stainless steel, and has a hardness of HRC30 to HRC65.

Alternatively, wear from the impact of the catheter body 1220 with the stop 1420 occurs only on the stop 1420. In this regard, the block 1420 may be formed entirely of a material having a relatively low hardness. Alternative materials include, but are not limited to, austenitic stainless steels or martensitic stainless steels, and have hardnesses in the range of HRC30 to HRC65. Alternatively, as shown in fig. 4, the block 1420 includes a joint part 1421 and a second wear part 1422, the joint part 1421 is connected to the needle body 1410, the second wear part 1422 is connected to the joint part 1421, and a proximal end of the second wear part 1422 constitutes a proximal end of the block 1420. The second wear portion 1422 is made of a material having a low hardness and being easily worn. Alternative materials include, but are not limited to, austenitic stainless steels or martensitic stainless steels, and have hardnesses in the range of HRC30 to HRC65.

Still alternatively, wear from the impact of the catheter body 1410 and the stop 1420 occurs on both the catheter body 1220 and the stop 1420 simultaneously. In this regard, as shown in fig. 5, the catheter body 1410 may include the tube body 1212 and the first wear portion 1213, and the stop 1420 may include the engagement portion 1421 and the second wear portion 1422.

In addition, in this embodiment, the stopper 1420 may be sleeved on the outer peripheral surface of the proximal end of the needle body 1410.

The structure of other components of the injector 1000 will be described in detail below. The following structure is merely an optional configuration of other parts of the injector 1000, and is not necessarily selected, and therefore, the present invention should not be construed as being limited thereto.

It will be appreciated that injector body 1100 has a first internal cavity running axially therethrough, which communicates with the receiving cavity. The moving member 1200 has a second lumen extending axially therethrough, and the distal sidewall of the catheter body 1220 further has a first fluid port 1211. The movable seat 1310 is provided with a second fluid hole 1311. The first lumen, the second lumen, the first fluid port 1211, and the second fluid port 1311 are in communication with each other. Thus, the combustible fluid medium enters the first lumen from the proximal end, flows into the distal portion of the first lumen through the second lumen, the first fluid port 1211, and passes through the second fluid port 1311 to the distal end of the first lumen, where the combustible fluid medium exits the injector 1000 when the distal end of the injector body 1100 is opened to form the fluid outlet. The combustible fluid medium is preferably a gaseous combustible fluid medium, such as hydrogen, but may also be various combustible oils.

The injector body 1100 includes a hub 1110, an inner support bar 1120, and valve pockets 1130, with the first internal cavity extending through the hub 1110, the inner support bar 1120, and the valve pockets 1130. The inner support bar 1120 comprises a first segment 1121 and a second segment 1122, the second segment 1122 is connected to a distal end of the first segment 1121, and an inner diameter of the first segment 1121 is greater than an inner diameter of the second segment 1122 so that a first step surface is formed on an inner wall of the inner support bar 1120. The distal end of the hub 1110 nests within the first section 1121 with a gap between the distal end face of the hub 1110 and the proximal end face of the second section 1122 so that the area between the distal end face of the hub 1110 and the first step face constitutes the receiving cavity. In other words, the distal end face of the hub 1110 constitutes the proximal side wall of the receiving cavity, and the first step face of the inner support 1120 constitutes the distal side wall of the receiving cavity. The valve housing 1130 is connected to the distal end of the inner support bar 1120, and a second step surface 1131 is provided on the inner wall of the valve housing 1130.

Further, the injector 1000 further includes a magnetic sleeve 1500, an electromagnetic coil 1600, and a gland 1700. The magnetic sleeve 1500 is sleeved on the outer periphery of the injector body 1100, specifically, the outer periphery of the inner support rod 1120 is sleeved, and a gap is formed between the inner wall of the magnetic sleeve 1500 and the outer wall of the injector body 1100. The electromagnetic coil 1600 is disposed between the magnetic sleeve 1500 and the injector body 1100. The pressing cover 1700 covers the proximal end surface of the magnetic sleeve 1500 and also covers the electromagnetic coil 1600. When electrical energy is provided to the electromagnetic coil 1600, the electromagnetic coil 1600 generates a magnetic field whose magnetic flux forms a closed magnetic circuit through the magnetic sleeve 1500, the gland 1700, the first segment 1121 of the inner support rod 1120, the armature 1210, the second segment 1122 of the inner support rod 1120, and back to the magnetic sleeve 1500, so that the electromagnetic force is present between the second segment 1122 of the inner support rod 1120 and the armature 1210. When the supply of the electric power to the electromagnetic coil 1600 is stopped, the electromagnetic coil 1600 immediately stops generating the magnetic field, and thus the electromagnetic force disappears.

The axial length of the armature 1210 is smaller than that of the accommodating cavity, a protruding portion 1230 protruding from the proximal end of the armature is formed on the moving part, the protruding portion 1230 is at least partially disposed in the first inner cavity, and the proximal end face of the protruding portion 1230 is used for abutting against the distal end of the second elastic member 1320. In this embodiment, as shown in fig. 2, the armature 1210 and the protrusion 1230 may be integrally formed, or they may be separately formed and then integrally connected. In an alternative embodiment, the armature is of a cylindrical configuration, and the proximal end of the tube body extends through the armature and projects from the armature, and the proximal portion of the tube body may form the projection (not shown).

The first elastic member 1320 may be a spring. The proximal end of the first elastic element 1320 may be fixedly connected to or abut against the movable seat 1310. The distal end of the first elastic member 1320 may be fixedly connected to the step surface 1131 of the valve sleeve 1130, or may abut against the second step surface 1131.

The stop 1330 may be a ring of raised structure formed on the inner wall of the hub 1110 or may be a hollow cylindrical sleeve that is bonded, welded or any other suitable means to fit into the first interior cavity and remain axially stationary relative to the hub 1110.

The second elastic member 1340 may also be a spring, and a proximal end thereof may be fixedly connected to the limiting portion 1330. The second resilient member 1340 is less stiff than the first resilient member 1320, such that when the first resilient member 1320 releases its elastic potential and drives the armature 1210 and the catheter body 1220 proximally and distally until the catheter body 1220 impacts the stop 1420, the first resilient member 1320 does not deform and firmly supports the stop 1420, preventing the stop 1420 from moving proximally and distally under the impact force causing the needle 1410 and the sealing portion 1430 to also move distally to reform the fluid outlet.

It is to be understood that the first and second elastic members 1320 and 1340 are in a natural state when the injector 1000 is in the initial state. At this time, a distance between a distal end face of the armature 1210 and a distal end side wall of the housing chamber is larger than zero, and a distance between a proximal end face of the armature 1210 and a proximal end side wall of the housing chamber is larger than zero. Meanwhile, the proximal end surface of the protrusion 1230 abuts against the distal end of the second elastic member 1340. As such, when the electromagnetic coil 1600 initially generates a magnetic field, the armature 1210 moves proximally and distally under the influence of the electromagnetic force. When the electromagnetic coil 1600 stops generating the magnetic field, such that the fluid outlet is closed, the armature 1210 can also move in the distal-to-proximal direction under the influence of inertia and compress the second resilient member 1340.

To sum up, the utility model discloses among the technical scheme that the technique provided, set up the pipe body and needle body into split type structure, and pass through set up the dog on the needle body, so that the pipe body with the striking takes place during the dog contact, and arouses the distal end terminal surface of the pipe body and/or the near-end terminal surface wearing and tearing of dog produce the third wearing and tearing volume, reduce the axial stroke of needle valve, and then reduce fluid outlet's fluid flow area. And the fluid flow area at the fluid outlet is increased by a first abrasion amount caused by the collision of the far end face of the armature and the far end side wall of the containing cavity and a second abrasion amount caused by the collision of the near end face of the sealing part and the far end face of the injector body. That is, the result of the third wear amount and the result of the first wear amount and the second wear amount may be at least partially offset, thereby facilitating the fluid flow area at the fluid outlet to be maintained within a predetermined range, maintaining the usability of the injector, and reducing or even eliminating the problems of slow needle valve opening response, insufficient combustion in the internal combustion engine, chattering, excessive air consumption, slow needle valve opening response, and the like.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. An injector having axially opposed proximal and distal ends, the injector comprising:

the inner wall of the injector body is provided with an accommodating cavity;

a moving member movable in an axial direction of the injector body and including an armature at least partially disposed in the accommodation chamber and a conduit body having a proximal end connected to the armature;

the first reset assembly is arranged in the ejector body and comprises a limiting part and a second elastic part; the limiting part is arranged on the proximal end side of the accommodating cavity and keeps axially and relatively static with the injector body, and the second elastic piece is arranged between the moving part and the limiting part; and the number of the first and second groups,

the needle valve can move along the axial direction of the injector body so as to enable the far end part of the injector body to be in an opening state or a blocking state, a stop block is formed at the near end of the needle valve, and the near end face of the stop block is used for being in contact with or separated from the far end face of the catheter body.

2. The injector of claim 1, wherein the conduit body includes a tube body and a first wear portion, a proximal end of the tube body being connected to the armature, a distal end of the tube body being connected to the first wear portion, a distal end face of the first wear portion being adapted to contact or separate from a proximal end face of the stopper.

3. The injector of claim 1 or 2, wherein the material of the stop is austenitic stainless steel or martensitic stainless steel.

4. The injector of claim 1 or 2, wherein the needle valve comprises a needle body, the stopper comprises an engagement portion and a second wear portion, the engagement portion is connected with the needle body, the second wear portion is connected with the engagement portion, and a proximal end surface of the second wear portion is configured to be brought into contact with or separated from a distal end surface of the catheter body.

5. The injector of claim 1, further comprising a second reset assembly disposed at a distal side of the accommodation chamber and including a movable seat and a first elastic member, a proximal end of the first elastic member being connected to the movable seat, and a distal end of the first elastic member abutting against an inner wall of the injector body; the movable seat can move along the axial direction of the injector body, and an avoidance hole is formed in the movable seat;

the far end of the needle valve penetrates through the avoidance hole, and the stop block is in contact with the end face of the near end of the movable seat.

6. The injector of claim 5, wherein the distal end of the needle valve further forms a seal at least partially external to the injector body, and a proximal end face of the seal contacts or separates from a distal end face of the injector body.

7. The injector of claim 5, wherein the first resilient member has a stiffness greater than a stiffness of the second resilient member.

8. The injector of claim 7, wherein an axial length of the armature is smaller than an axial length of the housing chamber, and a projection projecting from a proximal end of the armature is formed on the moving member, a proximal end face of the projection being adapted to abut a distal end of the second elastic member.

9. The injector of claim 1, wherein the injector body includes an inner support strut; the inner support rod comprises a first section and a second section which are axially connected, wherein the inner diameter of the first section is larger than that of the second section, so that a step surface is formed on the inner wall of the inner support rod, and the step surface forms a far end side wall of the accommodating cavity.

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