WO2023029314A1

WO2023029314A1 - Secondary valve seat assembly structure of gas pressure reduction device

Info

Publication number: WO2023029314A1
Application number: PCT/CN2021/142122
Authority: WO
Inventors: 刘寅春; 胡绍文; 姜林; 谭光辉; 郭凯风; 郭昊
Original assignee: 亚普汽车部件（开封）有限公司
Priority date: 2021-09-02
Filing date: 2021-12-28
Publication date: 2023-03-09
Also published as: CN115727172A

Abstract

A secondary valve seat assembly structure of a gas pressure reduction device, comprising: a primary valve housing (21), which is internally provided with a primary valve cavity (25), a primary valve core (214) being provided in the primary valve cavity (25); a secondary valve housing (31), being detachably connected to the primary valve housing (21), the secondary valve housing (31) and the primary valve housing (21) jointly defining a secondary valve cavity (33), and the secondary valve cavity (33) being internally provided with a secondary valve core (34). The secondary valve seat assembly structure further comprises: a valve core insertion seat (41). The valve core insertion seat (41) is a separate component and is detachably fixed on the primary valve housing (21), and can be disassembled from and assembled in the secondary valve cavity (33). A through hole (42) is formed in the valve core insertion seat (41), the end of the through hole (42) close to the primary valve core (214) faces the primary valve cavity (25), and a corresponding end of the secondary valve core (34) is inserted into the end of the through hole away from the primary valve core (214) in a guiding manner; the through hole (42) is internally provided with a secondary valve seat (36), and the secondary valve seat (36) is adapted to the secondary valve core (34) to achieve opening adjustment when the secondary valve core (34) moves in an axial direction.

Description

Secondary valve seat assembly structure of gas decompression device

technical field

The invention relates to a secondary valve seat assembly structure of a gas decompression device.

Background technique

In the control technology of the on-board hydrogen energy system of hydrogen fuel cell vehicles, the gas decompression device is a key component. At present, with the rapid development of the new energy vehicle market, hydrogen fuel cell vehicles have gradually become an important exploration direction to solve the energy resource crisis and environmental crisis. However, for hydrogen fuel cell vehicles, the pressure of the hydrogen storage system determines the amount of hydrogen stored. The hydrogen storage pressure of a current higher-pressure hydrogen storage system can reach 70Mpa, while the hydrogen input pressure required by the stack is only 1Mpa. -2Mpa, so a gas decompression device needs to be installed between the hydrogen storage system and the stack for decompression. The current gas decompression device often includes a two-stage decompression structure.

The gas decompression device in the prior art, for example, the valve assembly for the gas storage system disclosed in the patent document CN211423455U, includes a valve body, a primary decompression valve and a secondary decompression valve sequentially connected to the valve body . The first-stage pressure reducing valve includes a first-stage valve casing, which is provided with a first-stage valve chamber inside, and a first-stage valve core is arranged in the first-stage valve chamber; the second-stage valve casing is detachably connected to the first-stage valve casing, and forms a The secondary valve cavity is provided with a secondary valve core in the secondary valve cavity. For the secondary pressure reducing valve, its secondary valve seat is set in the primary valve cavity, therefore, when assembling the secondary pressure reducing valve, or only need to maintain the secondary pressure reducing valve, it is necessary to place the primary pressure reducing valve The pressure valve is disassembled, which is inconvenient for disassembly and maintenance.

Contents of the invention

The purpose of the present invention is to provide a secondary valve seat assembly structure of a gas decompression device, which can conveniently disassemble and maintain the secondary valve seat.

Adopt following technical scheme among the present invention:

The secondary valve seat assembly structure of the gas decompression device, including:

A first-level valve casing, with a first-level valve cavity inside, and a first-level valve core inside the first-level valve cavity;

The secondary valve casing is detachably connected to the primary valve casing, together with the primary valve casing, forms a secondary valve cavity, and a secondary valve core is arranged in the secondary valve cavity;

The secondary valve seat assembly structure also includes:

Valve core insertion seat, the valve core insertion seat is a separate component, detachably fixed on the primary valve casing, and can be disassembled from the secondary valve cavity;

A through hole is provided on the valve core insertion seat, the end of the through hole close to the primary valve core faces the primary valve chamber, and the end far away from the primary valve core is used for guiding and inserting the corresponding end of the secondary valve core;

A secondary valve seat is arranged in the through hole, and the secondary valve seat is adapted to the secondary valve core to realize opening adjustment when the secondary valve core moves axially.

Beneficial effects: adopting the above-mentioned technical scheme, the valve core insertion seat can be detachably fixed on the primary valve casing, and can be disassembled from the secondary valve cavity. In the hole, it can be adapted to the secondary valve core to meet the needs of the secondary decompression. When the secondary valve seat needs to be disassembled and maintained, the secondary valve cavity can be opened directly to operate the valve core insertion seat. Compared with existing technologies, it is easier to realize the disassembly and maintenance of the secondary valve seat.

As a preferred technical solution: the hole wall of the through hole is provided with a valve seat support platform, the valve seat support platform forms a support surface facing the first-stage valve core, and the second-stage valve seat is supported on the valve seat support. on stage;

There is also a valve seat crimping piece in the through hole, and the valve seat crimping piece is provided with an external thread, which is fixed in the through hole through the external thread, and the secondary valve seat is pressed and fixed on the valve seat support platform;

The valve seat crimping part is provided with a communication hole, so that the space on both sides of the valve seat crimping part in the axial direction communicates.

Beneficial effect: adopting the above technical scheme, the secondary valve seat is crimped and fixed by the valve seat crimping piece, which is convenient for installation and reliable for fixing.

As a preferred technical solution: the secondary valve seat includes:

Supporting ring, one end of which faces away from the first-stage valve core is supported on the valve seat supporting platform;

A sealing block, located on the side of the support ring close to the primary spool, is used to block the opening at the corresponding end of the secondary spool;

The portion of the support ring located on the radially outer side of the sealing block is provided with a communication channel, and the communication channel connects the two axial sides of the sealing block.

Beneficial effects: by adopting the above technical solution, the support ring can support the sealing block to a certain height, so that it is convenient to set up a communication channel to connect the two axial sides of the sealing block, conveniently ensure the passage of gas, and is convenient to manufacture.

As a preferred technical solution: the end of the support ring close to the primary valve core is provided with an inturned part, and the inner hole of the support ring includes a large-diameter section located on the side of the inverted part facing away from the primary valve core. The aperture of the aperture section is larger than the inner diameter of the inverting part;

The inversion part is provided with an axial through hole, and the axial through hole communicates with the large-aperture section, and forms the communication channel together with the large-aperture section.

Beneficial effects: adopting the above-mentioned technical scheme, the large-aperture section can ensure the gas circulation area, and the processing is convenient.

As a preferred technical solution: the sealing block is arranged separately from the supporting ring, an inner ring platform is provided at the central opening of the inversion part, and the sealing block is supported on the inner ring platform.

Beneficial effects: the adoption of the above technical solution can achieve radial positioning of the sealing block through the inner ring platform, and is beneficial to reduce the axial dimension of the secondary valve core, thereby better realizing the miniaturization and weight reduction of the gas decompression device.

As a preferred technical solution: the end of the through hole away from the primary valve core is provided with a valve core sealing ring;

The through hole has an annular sealing section, and the annular sealing section is located on the side of the valve seat support platform facing away from the primary valve core;

The inner diameter of the end of the supporting ring facing away from the first-stage valve core is smaller than the inner diameter of the annular sealing section, and the end face of the supporting ring and the annular sealing section together form a sealing ring groove for the installation of the valve core sealing ring.

Beneficial effect: adopting the above-mentioned technical scheme, when installing the valve core sealing ring, the valve core sealing ring can be directly installed into the annular sealing section from the lower end of the valve core insertion seat, and then the secondary valve seat and the valve seat crimping parts are installed. Compared with putting the sealing ring of the valve core into the annular sealing groove after being bent and deformed, the sealing ring of the valve core does not need to be deformed, the installation is convenient, and damage to the sealing ring of the valve core can be avoided.

As a preferred technical solution: the outer peripheral surface of the support ring is provided with an external thread, which is connected to the through hole of the valve core insertion seat through the external thread.

Beneficial effects: the adoption of the above technical solution can realize the adjustment of the position of the support ring, thereby realizing the adjustment of the secondary decompression pressure.

As a preferred technical solution: external threads are provided on the outer peripheral surface of the valve core inserting seat, and are fixed on the primary valve housing through external threads.

Beneficial effects: the adoption of the above-mentioned technical solution can facilitate the installation of the valve core insertion seat.

As a preferred technical solution: the primary valve core is pressed against the valve core insertion seat under the action of the primary pressure regulating spring.

Beneficial effects: by adopting the above technical scheme, the valve core insertion seat can adjust its own position through the external thread, thereby adjusting the compression amount of the primary pressure regulating spring, and realizing the adjustment of the primary decompression pressure.

As a preferred technical solution: the end of the first-stage valve core close to the second-stage valve core has a sealing insertion section, and the sealing insertion section is inserted into the end of the through hole close to the first-stage valve core, and is connected with the through hole Sealed by a sealing ring.

Beneficial effect: adopting the above technical scheme, both the first-stage valve core and the second-stage valve core can be sealed through the through hole on the valve core insertion seat, without considering the sealing problem outside the valve core insertion seat, which is beneficial to reduce the number of sealing rings , Improve sealing reliability and reduce costs.

As a preferred technical solution: the outer peripheral surface of the valve core insertion seat is provided with external threads, which are fixed in the threaded holes provided on the primary valve casing through external threads;

A communication groove is provided on the outer peripheral surface of the valve core insertion seat and/or the inner wall of the threaded hole, the communication groove extends along the axial direction of the threaded hole, one end communicates with the secondary valve cavity, and the other end communicates with the primary valve cavity ;

A gas channel is provided on the primary valve core or between the primary valve core and the inner wall of the primary valve cavity, so that the communication groove communicates with the breathing channel on the primary valve shell or the secondary valve shell.

Beneficial effects: the installation of the valve core insertion seat can be conveniently realized by adopting the above-mentioned technical scheme, and the communication groove can be conveniently set, so that the first-stage valve chamber and the second-stage valve chamber can be connected with the first-stage valve casing or the second-stage valve casing at the same time. The breathing channel is connected, which is beneficial to save the breathing valve on the breathing channel and is convenient for processing.

Description of drawings

Fig. 1 is the schematic diagram of the embodiment 1 of the secondary valve seat assembly structure of the gas decompression device in the present invention;

Figure 2 The partial enlarged view of the secondary valve seat in Figure 1.

The names of the components corresponding to the corresponding reference marks in the figure are: 11. Air intake joint; 12. Air inlet; 21. Primary valve housing; 22. Fixing hole; 23. Primary valve seat; 24. Filter element; 25. Primary valve cavity; 26. Valve port; 27. Axial channel; 28. Radial channel; 29. Primary pressure regulating spring; 210. Cylindrical support part; Stop step; 213, breathing channel; 214, primary valve core; 31, secondary valve casing; 32, air outlet; 33, secondary valve chamber; 34, secondary valve core; 35, axial through channel; 36, Secondary valve seat; 37, support ring; 38, sealing block; 39, inversion part; 310, inner ring platform; 311, large aperture section; 312, annular support step; 313, secondary pressure regulating spring; 41. Valve core insertion seat; 42. Through hole; 43. Valve seat support platform; 44. Valve seat crimping piece; 45. Ring sealing section; 46. Valve core sealing ring; 47. Communication hole; 48. Connecting groove; 51. Crimping sleeve.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that relative terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and No such actual relationship or order between these entities or operations is necessarily required or implied. Moreover, the terms "comprising", "comprising", or any other variation thereof, where the terms may appear, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, the possible occurrence of an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

In the description of the present invention, unless otherwise clearly specified and limited, the term "has to be" that may appear should be understood in a broad sense, for example, the object of "has to be" can be a part of the body, or it can be separated from the body Arranged and connected on the body, the connection can be detachable or non-detachable. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

Below in conjunction with embodiment the present invention is described in further detail.

Embodiment 1 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The gas decompression device in this embodiment is a high-pressure hydrogen decompression valve for vehicles, which is used in hydrogen energy vehicles. As shown in FIG. 1 , the decompression device for a vehicle includes an air intake joint 11 , a primary valve casing 21 , a secondary valve casing 31 and a crimping sleeve 51 . The inlet joint 11 is provided with an air inlet 12, which is used to connect with the hydrogen storage system for the entry of hydrogen at a higher pressure; the secondary valve housing 31 forms an outlet joint, on which an outlet 32 is provided for decompression to the set point. Hydrogen at constant pressure is discharged. The gas inlet 12 and the gas outlet 32 of the gas decompression device are located on a straight line, forming a straight-through structure, which is convenient for processing and has small gas flow resistance.

In order to facilitate a clear description of the embodiment of the present invention, hereinafter, the end of the gas decompression device provided with the inlet joint 11 is taken as the lower end, and the end provided with the secondary valve housing 31 is taken as the upper end, which is consistent with the orientation shown in FIG. 1 . Of course, the above-mentioned "up" and "down" are not used to limit the actual placement or use state of the gas decompression device. The gas decompression device can be arranged horizontally, inclined or vertically. When vertically arranged, the air inlet joint 11 One end can also be facing up.

The primary valve casing 21 constitutes the valve body of the gas decompression device, on which a fixing hole 22 is provided for fixing the gas decompression device. A first-stage valve seat 23 is crimped and fixed on the first-stage valve casing 21, and a filter element 24 is arranged between the first-stage valve seat 23 through the air inlet joint 11. The filter element 24 is a hollow cylindrical structure with a U-shaped longitudinal section; the air inlet joint 11 It is fixed on the primary valve casing 21 by screws. The first-stage valve casing 21 is provided with an axial opening, and the axial opening and the first-stage valve seat 23 together form a first-stage valve chamber 25, and the first-stage valve chamber 25 is provided with a first-stage valve core 214, and the first-stage valve core 214 The lower end of the lower end is provided with an inserting section, and the inserting section is guided and inserted in the valve core jack on the first-level valve seat 23, and forms a sealing fit with the first-level valve seat 23 by the first-level valve core sealing ring. A valve port 26 is provided at the bottom of the spool socket, and a sealing block is embedded on the lower end surface of the first-stage spool 214, and the sealing block is used to cooperate with the valve port 26 to form a certain opening to reduce pressure. The inside of the primary spool 214 is provided with a flow channel for leading to the secondary decompression assembly. The flow passage includes an axial channel 27 and a radial channel 28, the radial channel 28 is arranged on the small diameter section below the primary spool sealing ring, the ring between the outer end and the primary spool 214 and the wall of the spool socket hole The gap communicates, and the inner end communicates with the axial channel 27. A primary pressure regulating spring 29 is provided between the primary valve core 214 and the primary valve seat 23 for realizing primary pressure reduction.

The top of the primary valve casing 21 is provided with a cylindrical support portion 210 , and the secondary valve casing 31 is fastened to the cylindrical support portion 210 on the primary valve casing 21 . The outer circumference of the primary valve casing 21 is provided with a crimping sleeve 51, and the crimping sleeve 51 is provided with an internal thread, which is fixed on the cylindrical support part 210 through the internal thread to realize the fixing of the secondary valve casing 31. The casing 31 together with the primary valve casing 21 forms a secondary valve cavity 33 . The secondary valve cavity 33 is provided with a secondary valve core 34, the lower end of the secondary valve core 34 is also provided with an insertion section, and the upper end is a disc-shaped structure, which guides and cooperates with the inner wall of the secondary valve housing 31. A sealing ring is provided on the outer peripheral surface of the structure for sealing with the secondary valve housing 31 . The axial center of the secondary spool 34 is provided with an axial through passage 35, and the lower end opening of the axial through passage 35 is used to fit with the secondary valve seat 36 to realize the opening when the secondary spool 34 moves axially. adjust.

As shown in Figure 2, the secondary valve seat 36 is arranged on the valve core insertion seat 41. The valve core insertion seat 41 is a separate component and is a sleeve structure. The outer peripheral surface of its lower end is provided with external threads, which are fixed on a The secondary valve housing 21 can be installed and disassembled from the secondary valve cavity 33 . In order to improve the fixing reliability of the valve core insertion seat 41, the first-stage valve housing 21 is provided with a cylindrical protrusion, and the inner wall of the cylindrical protrusion is provided with an external thread, which can lengthen the valve core insertion seat 41. The length of the threaded connection with the primary valve housing 21. The inner hole of the spool insertion seat 41 forms a through hole 42 , the lower end of the through hole 42 communicates with the primary valve chamber 25 , and the upper end is used for guiding and inserting the corresponding end of the secondary spool 34 .

A valve seat support platform 43 is provided in the through hole 42 of the valve core insertion seat 41 . The valve seat support platform 43 forms a downward support surface, and the secondary valve seat 36 is supported on the valve seat support platform 43 . There is also a valve seat crimping piece 44 inside the through hole 42, and the valve seat crimping piece 44 is provided with an external thread, which is fixed in the through hole 42 through the external thread, and the secondary valve seat 36 is pressed and fixed on the valve seat support platform. 43 on.

The secondary valve seat 36 is an assembly, including a support ring 37 and a sealing block 38 . The upper end of the support ring 37 is supported on the valve seat support platform 43 , the lower end of the support ring 37 is provided with an inversion part 39 , and an inner ring platform 310 is provided at the central opening of the inversion part 39 . The inner hole of the support ring 37 includes a large-diameter section 311 located on the upper side of the inversion portion 39 , and the large-aperture section 311 is arranged in the axial middle of the support ring 37 , and its diameter is larger than the inner diameter of the inversion portion 39 . The inversion part 39 at the lower end of the support ring 37 is provided with an axial through hole 314, the axial through hole 314 communicates with the large aperture section 311, and forms a communication channel with the large aperture section 311, and the communication channel connects the upper and lower sides of the sealing block 38 connected. The outer peripheral surface of the support ring 37 is provided with an external thread, which is connected to the through hole 42 of the valve core insertion seat 41 through the external thread, and the position adjustment of the support ring 37 can be realized through the thread during use, thereby realizing the adjustment of the secondary decompression pressure. adjust.

The sealing block 38 is used to block the lower end opening of the secondary spool 34. The sealing block 38 is provided with an annular support step 312, which is supported on the inner ring platform 310 by the annular support step 312. The support ring 37 can make the sealing block 38 relatively The valve seat support platform 43 is lifted so that its upper side is below the upper end surface of the support ring 37 to provide a space for the gas to be decompressed to pass through. The sealing block 38 can be supported by the inner ring platform 310 on the support ring 37 to form a radial positioning of the sealing block 38, and it is beneficial to reduce the axial dimension of the secondary valve seat 36, thereby reducing the cost of the entire gas decompression device. Axial dimensions and weight.

The sealing block 38 is press-fitted and fixed by the valve seat crimping piece 44. Compared with the prior art, which fixes the sealing block 38 on the mounting seat of the sealing block 38 through the screw passing through the center of the sealing block 38, screw production and installation can be avoided. Inconvenience and other issues.

The through hole 42 of the valve core insertion seat 41 has an annular sealing section 45 , and the annular sealing section 45 is located at the upper end of the valve seat supporting platform 43 . The upper end of the supporting ring 37 is provided with an inner flange, so that the inner diameter of the upper end is smaller than the inner diameter of the annular sealing section 45, and the upper end surface of the supporting ring 37 and the annular sealing section 45 jointly form a sealing ring groove, and the corresponding valve core sealing ring 46 is installed on the The groove of the sealing ring is used to form a sealing fit with the secondary valve core 34 . Preferably, the inner diameter of the inner flange at the upper end of the support ring 37 is slightly larger than the outer diameter of the insertion section of the primary valve core 214 , which can avoid affecting the insertion of the primary valve core 214 . When installing the spool sealing ring 46, the spool sealing ring 46 is directly packed into the annular sealing section 45 from the lower end of the spool insertion seat 41, and then the secondary valve seat 36 and the valve seat crimping part 44 are installed, compared to passing through The sealing ring 46 of the valve core is bent and deformed and put into the annular sealing groove without deformation of the sealing ring 46 of the valve core, which is convenient for installation and can avoid damage to the sealing ring 46 of the valve core. Of course, in order to ensure the passage of gas, the valve seat crimping part 44 is provided with communication holes 47, and the communication holes 47 are evenly distributed along the circumferential direction, so that the spaces on both sides of the valve seat crimping part 44 are connected in the axial direction, and the upper end of the valve seat crimping part 44 There is a boss in the center of the boss, and the outer peripheral space of the boss forms an airflow buffer space, which is conducive to reducing the airflow resistance and ensuring the smooth passage of the airflow. When the upper and lower positions of the support ring 37 are adjusted by threads, in order to ensure the integrity of the sealing ring groove, an adjusting gasket can be arranged on the upper end of the support ring 37 .

The upper end of the first-stage spool 214 has a sealing insertion section 211 , which is inserted into the lower end of the through hole 42 of the spool insertion seat 41 , and is sealed with the through hole 42 by a sealing ring. The first-stage spool 214 is plugged into the spool insert seat 41, so that the first-stage spool 214 and the second-stage spool 34 can be sealed through the through hole 42 on the spool insert seat 41, without consideration The external sealing problem of the valve core insertion seat 41 is beneficial to reduce the number of sealing rings, improve sealing reliability and reduce costs. Simultaneously, the diameter of the opening for the installation of the valve core insert seat 41 on the primary valve housing 21 is greater than the outer diameter of the primary valve core 214 and the primary pressure regulating spring 29, so that the primary valve core 214 and the primary pressure regulating spring 29 can also be installed from the upper side of the gas decompression device, and the installation is more convenient. In addition, the primary spool 214 is provided with an annular stopper step 212, the annular stopper step 212 is located below the sealing insertion section 211, and is used to push against the spool insertion seat under the action of the primary pressure regulating spring 29. 41 on. By adjusting the threaded connection position of the spool insert seat 41 on the primary valve housing 21 , the compression amount of the primary pressure regulating spring 29 can be adjusted, thereby realizing the manual pressure adjustment of the primary pressure reducing structure.

In order to prevent the air pressure in the primary valve chamber 25 from changing when the primary valve core 214 moves and affect the movement of the primary valve core 214 , a breathing channel 213 is provided on the side wall of the primary valve housing 21 . The outer peripheral surface of the valve core insertion seat 41 is provided with external threads, which are fixed in the threaded hole provided on the primary valve housing 21 by external threads; the outer peripheral surface of the valve core insertion seat 41 is provided with a communication groove 48, and the communication groove 48 extends along the axial direction of the threaded hole, one end communicates with the secondary valve cavity 33, and the other end communicates with the primary valve cavity 25, so that the primary valve cavity 25 and the secondary valve cavity 33 can share one breathing channel 213, which is beneficial to Reduce parts count and cost. Preferably, there are multiple communication grooves 48 uniformly distributed along the circumference, and there are three communication grooves in this embodiment. Of course, a gas channel should be provided on the primary valve core 214 or between the primary valve core 214 and the inner wall of the primary valve chamber 25, so that the breathing channel 213 communicates with the communication groove 48. In this embodiment, the primary valve core 214 The outer diameter is smaller than the inner diameter of the first-stage valve cavity 25 , forming an annular space with the first-stage valve housing 21 , and the annular space forms a gas channel. In other embodiments, the communication groove 48 may also be provided on the inner wall of the threaded hole provided on the primary valve housing 21 . In addition, in other embodiments, a through hole may also be provided on the annular stopper step 212 of the primary valve core 214 , and the gas passage is formed by means of the through hole.

When assembling the above-mentioned gas decompression device, the primary pressure regulating spring 29, the primary valve core 214, the valve core inserting seat 41 with the secondary valve seat 36 installed, the secondary pressure regulating spring 313, and the secondary pressure regulating spring 313 can be installed sequentially from above. Valve core 34 , secondary valve casing 31 and crimping sleeve 51 . When disassembling and maintaining the secondary decompression assembly, operations can be performed in the reverse order. Compared with the prior art, the secondary valve seat 36 can be easily disassembled and maintained.

During use, high-pressure hydrogen enters the valve port 26 of the first-stage pressure reducing valve through the inlet joint 11 and the filter element 24, and then passes through the radial channel 28 and the axial channel 27 on the valve core to pass through the first-stage valve core 214, acting on a The upper end surface of the first-stage spool 214 pushes the first-stage spool 214 to move down, so that the first-stage spool 214 maintains balance under the joint action of the gas pressure at both ends and the first-stage pressure regulating spring 29, and realizes the first-stage decompression. The decompression is mainly to withstand the impact of gas filling, perform preliminary decompression, and protect the secondary decompression assembly. After the first stage of decompression, the hydrogen enters the secondary valve core 34 from the communication hole 47 on the secondary valve seat 36, and is discharged to the outlet joint through the axial through passage 35 on the secondary valve core 34, and acts on the secondary valve core. The upper end surface of the core 34 pushes the secondary spool 34 to move down, so that the secondary spool 34 maintains balance under the joint action of the gas pressure at both ends and the secondary pressure regulating spring 313, so as to realize the secondary pressure reduction and meet the requirements of gas pressure reduction. The key performance indicators of the device are finally discharged from the outlet channel on the outlet joint.

Embodiment 2 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the secondary valve seat 36 is crimped in the valve core insertion seat 41 through the valve seat crimping piece 44, while in this embodiment, the secondary valve seat 36 The seat is welded and fixed in the cartridge seat of the spool.

Embodiment 3 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the secondary valve seat 36 is an assembly, including a support ring 37 and a sealing block 38, while in this embodiment, the secondary valve seat has an integral structure .

Embodiment 4 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the sealing ring groove for the installation of the valve core sealing ring 46 on the valve core insertion seat 41 is surrounded by the support ring 37 and the valve seat insertion seat, while In this embodiment, the sealing ring groove is an annular groove provided on the inner wall of the through hole of the valve seat insertion seat, and the support ring only plays the role of supporting the sealing block.

Embodiment 5 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the support ring 37 is provided with an external thread, which is threaded into the through hole 42 on the valve seat insertion seat, while in this embodiment, the support ring The outer peripheral surface of the valve is smooth, and it is crimped and fixed in the valve seat inserting seat by means of the valve seat crimping piece.

Embodiment 6 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the insertion section at the upper end of the primary valve core 214 is guided and inserted into the valve core insertion seat 41 and is sealed with the valve core insertion seat 41. However, in this embodiment, the upper end of the primary valve core can also be separated from the valve core insertion seat, and form a guiding and sealing fit with the inner wall of the primary valve cavity.

Embodiment 7 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the valve core insertion seat 41 can form a stop for the primary valve core 214, while in this embodiment, the valve core insertion seat is designed to be The first-stage spools are kept separated from each other, the first-stage valve cavity is provided with a downward supporting step surface, and the supporting step faces the first-stage spool to form a stop.

Embodiment 8 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the valve core insertion seat 41 is provided with an external thread, which is detachably fixed on the primary valve casing 21 through threaded connection, while in this embodiment, The lower end of the valve core insertion seat is provided with a connecting flange, which is fixed on the first-stage valve casing by flanges and screws.

Embodiment 9 of the secondary valve seat assembly structure of the gas decompression device in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the secondary valve core 34 is provided with an axial through passage 35, the secondary valve seat 36 includes a sealing block 38, and the sealing block 38 and the axial through passage 35 is adapted to the lower end opening, and in this embodiment, the structure of the insertion section on the secondary valve core is the same as that of the primary valve core, and the flow passages on it include axial passages and radial passages, and There is a sealing block on the bottom surface, and the structure of the secondary valve seat is the same as that of the primary valve seat. pass. Of course, in other embodiments, the secondary valve seat in this embodiment can also be fixed on the valve core insertion seat by other means, such as welding, or adopting an integrated structure.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the present invention, All should be included in the protection scope of the present invention in the same way.

Claims

The secondary valve seat assembly structure of the gas decompression device, including:

The primary valve casing (21) is provided with a primary valve cavity (25) inside, and a primary valve core (214) is provided in the primary valve cavity (25);

The secondary valve casing (31) is detachably connected to the primary valve casing (21), and together with the primary valve casing (21) forms a secondary valve cavity (33), the secondary valve cavity (33) is provided with Secondary spool (34);

It is characterized in that the assembly structure of the secondary valve seat also includes:

Spool insertion seat (41), the valve core insertion seat (41) is a separate component, detachably fixed on the primary valve casing (21), and can be disassembled from the secondary valve chamber (33);

The spool insert seat (41) is provided with a through hole (42), and the end of the through hole (42) near the primary spool (214) faces the primary valve cavity (25), and is far away from the end of the primary spool (214). One end guides and inserts for the corresponding end of the secondary spool (34);

A secondary valve seat (36) is arranged in the through hole (42), and the secondary valve seat (36) is used to adapt to the secondary valve core (34) so as to realize when the secondary valve core (34) moves axially Opening adjustment.
The two-stage valve seat assembly structure according to claim 1, characterized in that, a valve seat support platform (43) is provided on the hole wall of the through hole (42), and the valve seat support platform (43) is formed toward the The supporting surface of the primary valve core (214), the secondary valve seat (36) is supported on the valve seat support platform (43);

The through hole (42) is also provided with a valve seat crimping piece (44), and the valve seat crimping piece (44) is provided with an external thread, which is fixed in the through hole (42) through the external thread, and the secondary valve Seat (36) is compressed and fixed on the valve seat support platform (43);

The valve seat crimping part (44) is provided with a communication hole (47), so that the space on both sides of the valve seat crimping part (44) in the axial direction communicates.
The secondary valve seat assembly structure according to claim 2, wherein the secondary valve seat (36) comprises:

Support ring (37), its one end facing away from the primary valve core (214) is supported on the valve seat support platform (43);

The sealing block (38), located on the side of the support ring (37) close to the primary spool (214), is used to block the opening at the corresponding end of the secondary spool (34);

The portion of the support ring (37) located radially outside the sealing block (38) is provided with a communication channel, and the communication channel connects both axial sides of the sealing block (38).
The secondary valve seat assembly structure according to claim 3, characterized in that, the end of the support ring (37) close to the primary valve core (214) is provided with an inversion part (39), and the support ring (37) The inner hole includes a large-aperture section (311) located on the side of the inversion part (39) facing away from the primary spool (214), and the aperture of the large-aperture section (311) is larger than the inner diameter of the inversion part (39);

The inversion part (39) is provided with an axial through hole (314), and the axial through hole (314) communicates with the large aperture section (311) to form the communication channel together with the large aperture section (311).
The two-stage valve seat assembly structure according to claim 3 or 4, characterized in that, the sealing block (38) and the support ring (37) are arranged separately, and the center opening of the inversion part (39) An inner ring platform (310) is provided, and the sealing block (38) is supported on the inner ring platform (310).
The secondary valve seat assembly structure according to claim 3 or 4, characterized in that, the end of the through hole (42) away from the primary valve core (214) is provided with a valve core sealing ring (46);

The through hole (42) has an annular sealing section (45), and the annular sealing section (45) is located on the side of the valve seat support platform (43) facing away from the primary valve core (214);

The inner diameter of the end of the supporting ring (37) facing away from the first-stage valve core (214) is smaller than the inner diameter of the annular sealing section (45), and the end face of the supporting ring (37) and the annular sealing section (45) together form a sealed seal. Ring groove for the installation of the spool sealing ring (46).
The secondary valve seat assembly structure according to claim 3 or 4, characterized in that, the outer peripheral surface of the support ring (37) is provided with external threads, and is connected to the valve core insertion seat (41) through external threads. Inside the through hole (42).
According to the secondary valve seat assembly structure according to any one of claims 1 to 4, it is characterized in that, the outer peripheral surface of the valve core insertion seat (41) is provided with external threads, which are fixed on a on the stage valve housing (21).
According to the assembly structure of the secondary valve seat according to any one of claims 1 to 4, it is characterized in that the end of the primary valve core (214) close to the secondary valve core (34) has a sealing insertion section ( 211), the sealing inserting section (211) is plugged into the end of the through hole (42) close to the primary valve core (214), and is sealed with the through hole (42) by a sealing ring.
The secondary valve seat assembly structure according to claim 9, characterized in that, the outer peripheral surface of the valve core insertion seat (41) is provided with external threads, and is fixed on the primary valve housing (21) through external threads In the set threaded hole;

A communication groove (48) is provided on the outer peripheral surface of the valve core insertion seat (41) and/or the inner wall of the threaded hole. The communication groove (48) extends axially along the threaded hole, and one end is connected with the secondary valve chamber ( 33) is communicated, and the other end communicates with the primary valve chamber (25);

A gas channel is provided on the primary valve core (214) or between the primary valve core (214) and the inner wall of the primary valve chamber (25), so that the communication groove (48) and the primary valve housing (21) or the secondary The breathing channel (213) on the valve housing (31) is in communication.