Secondary valve seat assembly for gas pressure reducing device

Abstract

The application relates to a secondary valve seat assembly structure of a gas pressure reducing device. The secondary valve seat assembly structure of the gas pressure reducing device comprises a primary valve shell, a primary valve cavity is arranged in the primary valve shell, a primary valve core is arranged in the primary valve cavity; a secondary valve shell is detachably connected to the primary valve shell, and the primary valve shell and the secondary valve shell jointly form a secondary valve cavity, a secondary valve core is arranged in the secondary valve cavity; the secondary valve seat assembly structure further comprises a valve core plug-in seat which is a separate component, is detachably fixed on the primary valve shell, and can be disassembled from the secondary valve cavity; a through hole is arranged on the valve core plug-in seat, one end of the through hole close to the primary valve core faces the primary valve cavity, and the other end away from the primary valve core is used for guiding and plugging the corresponding end of the secondary valve core; a secondary valve seat is arranged in the through hole, and the secondary valve seat is used for adapting to the secondary valve core to realize opening degree adjustment when the secondary valve core moves in the axial direction. The above scheme can conveniently disassemble and maintain the secondary valve seat.

Description

Technical Field

[0001] This invention relates to the assembly structure of a two-stage valve seat in a gas pressure reducing device. Background Technology

[0002] In the control technology of on-board hydrogen energy systems for hydrogen fuel cell vehicles, the gas pressure reduction device is a key component. Currently, with the rapid development of the new energy vehicle market, hydrogen fuel cell vehicles are gradually becoming an important direction for addressing the energy resource crisis and environmental crisis. However, for hydrogen fuel cell vehicles, the pressure of the hydrogen storage system determines the hydrogen storage capacity. Currently, a relatively high-pressure hydrogen storage system can reach a pressure of 70 MPa, while the hydrogen input pressure required by the fuel cell stack is only 1-2 MPa. Therefore, a gas pressure reduction device is needed between the hydrogen storage system and the fuel cell stack for pressure reduction. Current gas pressure reduction devices often include a two-stage pressure reduction structure.

[0003] Existing gas pressure reducing devices, such as the valve assembly for a gas storage system disclosed in patent document CN211423455U, include a valve body, a primary pressure reducing valve, and a secondary pressure reducing valve connected sequentially to the valve body. The primary pressure reducing valve includes a primary valve housing with a primary valve chamber containing a primary valve core. The secondary valve housing is detachably connected to the primary valve housing, forming a secondary valve chamber with the primary valve housing, and contains a secondary valve core. For the secondary pressure reducing valve, its secondary valve seat is located within the primary valve chamber. Therefore, when assembling the secondary pressure reducing valve, or when only maintenance of the secondary pressure reducing valve is required, the primary pressure reducing valve needs to be disassembled, making disassembly and maintenance inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide a secondary valve seat assembly structure for a gas pressure reducing device, which allows for convenient disassembly and maintenance of the secondary valve seat.

[0005] The present invention adopts the following technical solution:

[0006] The secondary valve seat assembly structure of the gas pressure reducing device includes:

[0007] The first-stage valve body contains a first-stage valve chamber, and the first-stage valve chamber contains a first-stage valve core.

[0008] The secondary valve housing is detachably connected to the primary valve housing, and together with the primary valve housing, they form the secondary valve chamber, which contains the secondary valve core.

[0009] The secondary valve seat assembly structure also includes:

[0010] The valve core insert is a separate component that can be detachably fixed to the primary valve housing and can be disassembled and installed from the secondary valve chamber.

[0011] The valve core cartridge seat is provided with a through hole. The end of the through hole closer to the first-stage valve core faces the first-stage valve cavity, and the end farther away from the first-stage valve core is used for guiding the corresponding end of the second-stage valve core for insertion.

[0012] A secondary valve seat is provided inside the through hole. The secondary valve seat is used to adapt to the secondary valve core to achieve opening adjustment when the secondary valve core moves axially.

[0013] Beneficial effects: By adopting the above technical solution, the valve core cartridge seat can be detachably fixed on the primary valve body and can be disassembled and installed from the secondary valve cavity. At the same time, the secondary valve seat is set in the through hole on the valve core cartridge seat, which can be adapted to the secondary valve core to meet the secondary pressure reduction requirements. When it is necessary to disassemble and maintain the secondary valve seat, the secondary valve cavity can be opened directly and the valve core cartridge seat can be operated. Compared with the existing technology, it is easier to disassemble and maintain the secondary valve seat.

[0014] As a preferred technical solution: a valve seat support platform is provided on the wall of the through hole, the valve seat support platform forms a support surface facing the primary valve core, and the secondary valve seat is supported on the valve seat support platform;

[0015] The through hole is also provided with a valve seat crimping component, which has an external thread. The component is fixed in the through hole by the external thread, and the secondary valve seat is pressed and fixed on the valve seat support platform.

[0016] The valve seat crimping component has a connecting hole, which allows the space on both sides of the valve seat crimping component to be connected axially.

[0017] Beneficial effects: By adopting the above technical solution, the secondary valve seat is fixed by pressing with a valve seat crimping component, which is convenient to install and reliable to fix.

[0018] As a preferred technical solution: the secondary valve seat includes:

[0019] The support ring, with its end facing away from the first-stage valve core, is supported on the valve seat support platform;

[0020] The sealing block, located on the side of the support ring near the first-stage valve core, is used to block the corresponding end opening of the second-stage valve core;

[0021] The support ring has a connecting channel on the radially outer part of the sealing block, which connects the two axial sides of the sealing block.

[0022] Beneficial effects: By adopting the above technical solution, the support ring can support the sealing block at a certain height, which makes it easy to set up a connecting channel to connect the two axial sides of the sealing block, conveniently ensuring the passage of gas, and is easy to manufacture.

[0023] As a preferred technical solution: the support ring has an inwardly turned portion at one end near the first-stage valve core, and the inner hole of the support ring includes a large-diameter section located on the side of the inwardly turned portion facing away from the first-stage valve core, the diameter of the large-diameter section being larger than the inner diameter of the inwardly turned portion.

[0024] The inward-turned portion is provided with an axial through hole, which communicates with the large-diameter section and together with the large-diameter section forms the communication channel.

[0025] Beneficial effects: By adopting the above technical solution, the large-diameter section can ensure the gas flow area and is easy to process.

[0026] As a preferred technical solution: the sealing block and the support ring are arranged separately, and an inner ring platform is provided at the center opening of the inward-turned part, and the sealing block is supported on the inner ring platform.

[0027] Beneficial effects: The above technical solution enables radial positioning of the sealing block through the inner ring platform, and helps to reduce the axial dimension of the secondary valve core, thereby better realizing the miniaturization and weight reduction of the gas pressure reducing device.

[0028] As a preferred technical solution: a valve core sealing ring is provided at the end of the through hole away from the primary valve core;

[0029] The through hole has an annular sealing section, which is located on the side of the valve seat support platform facing away from the first-stage valve core.

[0030] The inner diameter of the end of the support ring facing away from the primary valve core is smaller than the inner diameter of the annular sealing section. The end face of the support ring and the annular sealing section together form a sealing groove for the valve core sealing ring to be installed.

[0031] Beneficial effects: By adopting the above technical solution, when installing the valve core sealing ring, the valve core sealing ring can be directly inserted into the annular sealing section from the lower end of the valve core insert seat, and then the secondary valve seat and valve seat crimping parts can be installed. Compared with bending and deforming the valve core sealing ring before inserting it into the annular sealing groove, it is not necessary to deform the valve core sealing ring, making the installation convenient and avoiding damage to the valve core sealing ring.

[0032] As a preferred technical solution: the outer circumferential surface of the support ring is provided with external threads, and is connected to the through hole of the valve core insert seat through the external threads.

[0033] Beneficial effects: The above technical solution can achieve the position adjustment of the support ring, thereby realizing the adjustment of the secondary pressure reduction.

[0034] As a preferred technical solution: the outer circumferential surface of the valve core insert seat is provided with external threads, which are used to fix it to the first-stage valve body.

[0035] Beneficial effects: The above technical solution facilitates the installation of valve core cartridge seats.

[0036] As a preferred technical solution: the primary valve core is pressed against the valve core insert seat under the action of the primary pressure regulating spring.

[0037] Beneficial effects: By adopting the above technical solution, the valve core cartridge seat can adjust its own position through the external thread, thereby adjusting the compression of the first-stage pressure regulating spring and realizing the adjustment of the first-stage pressure reduction.

[0038] As a preferred technical solution: the end of the primary valve core near the secondary valve core has a sealing insertion section, which is inserted into the end of the through hole near the primary valve core and sealed with the through hole by a sealing ring.

[0039] Beneficial effects: By adopting the above technical solution, both the primary valve core and the secondary valve core can be sealed through the through hole on the valve core cartridge seat, without having to consider the sealing problem outside the valve core cartridge seat. This helps to reduce the number of sealing rings, improve sealing reliability, and reduce costs.

[0040] As a preferred technical solution: the outer circumferential surface of the valve core insert seat is provided with external threads, and it is fixed in the threaded hole provided on the first-stage valve body by the external threads;

[0041] A connecting groove is provided on the outer peripheral surface of the valve core insert seat and / or the inner wall of the threaded hole. The connecting groove extends along the axial direction of the threaded hole, with one end communicating with the secondary valve chamber and the other end communicating with the primary valve chamber.

[0042] A gas passage is provided on the primary valve core or between the primary valve core and the inner wall of the primary valve chamber, so that the connecting groove is connected to the breathing passage on the primary valve shell or the secondary valve shell.

[0043] Beneficial effects: The above technical solution can facilitate the installation of valve core cartridge seats and facilitate the setting of connecting grooves, so that the primary valve chamber and the secondary valve chamber can be connected to the breathing channel on the primary valve shell or the secondary valve shell at the same time. This is beneficial to save breathing valves on the breathing channel and facilitates processing. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of Embodiment 1 of the two-stage valve seat assembly structure of the gas pressure reducing device in this invention;

[0045] Figure 2 Figure 1 A magnified view of the secondary valve seat area.

[0046] The names of the components corresponding to the reference numerals in the figure are as follows: 11. Inlet connector; 12. Inlet port; 21. First-stage valve body; 22. Fixing hole; 23. First-stage valve seat; 24. Filter element; 25. First-stage valve chamber; 26. Valve port; 27. Axial channel; 28. Radial channel; 29. ​​First-stage pressure regulating spring; 210. Cylindrical support; 211. Sealing insertion section; 212. Annular stop step; 213. Breathing channel; 214. First-stage valve core; 31. Second-stage valve body; 32. Outlet port; 33. Second-stage valve body; 24. Filter element; 25. First-stage valve chamber; 26. Valve port; 27. Axial channel; 28. Radial channel; 29. ​​First-stage pressure regulating spring; 20. Cylindrical support section; 211. Sealing insertion section; 212. Annular stop step; 213. Breathing channel; 214. First-stage valve core; 31. Second-stage valve body; 32. Outlet port; 33. Second-stage valve body; 24. Filter element; 25. First-stage valve chamber; 26. Filter element; 27. Filter element; 28. Filter element; 29. ​​Filter element; 20. Filter element; 20. Filter element; 21. Filter element; 22. Filter element; 23. Filter element; 24. Filter element; 25. Filter element; 26. Filter element; 27. Filter element; 28. Filter element; 29. ​​Filter element; 20. Filter element; 20. Filter element; 21. Filter element; 22. Filter element; 23. Filter element 34. Secondary valve chamber; 35. Axial through passage; 36. Secondary valve seat; 37. Support ring; 38. Sealing block; 39. Inward turning part; 310. Inner ring platform; 311. Large diameter section; 312. Annular support step; 313. Secondary pressure regulating spring; 314. Axial through hole; 41. Valve core insert seat; 42. Through hole; 43. Valve seat support platform; 44. Valve seat crimping part; 45. Annular sealing section; 46. Valve core sealing ring; 47. Connecting hole; 48. Connecting groove; 51. Crimping sleeve. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0049] It should be noted that the relational terms such as "first" and "second" that may appear in the specific embodiments of the present invention are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising one..." which defines an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0052] The present invention will be further described in detail below with reference to the embodiments.

[0053] Example 1 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0054] The gas pressure reducing device in this embodiment is a high-pressure hydrogen pressure reducing valve for vehicles, specifically for hydrogen fuel cell vehicles. Figure 1 The vehicle-mounted pressure reducing device includes an inlet connector 11, a primary valve housing 21, a secondary valve housing 31, and a crimping sleeve 51. The inlet connector 11 has an inlet port 12 for connection to a hydrogen storage system, allowing high-pressure hydrogen gas to enter. The secondary valve housing 31 forms an outlet connector with an outlet port 32 for discharging hydrogen gas reduced to a set pressure. The inlet port 12 and outlet port 32 of the gas pressure reducing device are aligned in a straight line, forming a straight-through structure, which facilitates processing and minimizes gas flow resistance.

[0055] To clearly describe the embodiments of the present invention, in the following text, the end of the gas pressure reducing device with the air inlet connector 11 is referred to as the lower end, and the end with the secondary valve housing 31 is referred to as the upper end. Figure 1 The orientation shown in the image is consistent. Of course, the terms "up" and "down" are not used to limit the actual placement or use of the gas pressure reducing device. The gas pressure reducing device can be arranged horizontally, inclined, or vertically. When arranged vertically, one end of the inlet connector 11 can also face upwards.

[0056] The primary valve housing 21 constitutes the valve body of the gas pressure reducing device, and has a fixing hole 22 for fixing the gas pressure reducing device. A primary valve seat 23 is press-fitted and fixed to the primary valve housing 21. A filter element 24 is installed between the primary valve seat 23 and the inlet connector 11. The filter element 24 is a hollow cylindrical structure with a U-shaped longitudinal section. The inlet connector 11 is fixed to the primary valve housing 21 with screws. An axial opening is provided inside the primary valve housing 21, which, together with the primary valve seat 23, forms a primary valve cavity 25. A primary valve core 214 is located inside the primary valve cavity 25. The lower end of the primary valve core 214 has an insert section, which is guided and inserted into the valve core insertion hole on the primary valve seat 23, forming a sealing fit with the primary valve seat 23 through a primary valve core sealing ring. A valve port 26 is provided at the bottom of the valve core insertion hole. A sealing block is embedded on the lower end face of the primary valve core 214. The sealing block cooperates with the valve port 26 to form a certain opening, thereby reducing pressure. The primary valve core 214 has an internal flow channel leading to the secondary pressure reducing assembly. The flow channel includes an axial channel 27 and a radial channel 28. The radial channel 28 is located on a small-diameter section below the primary valve core sealing ring, with its outer end communicating with the annular gap between the primary valve core 214 and the valve core insertion hole wall, and its inner end communicating with the axial channel 27. A primary pressure adjusting spring 29 is provided between the primary valve core 214 and the primary valve seat 23 to achieve primary pressure reduction.

[0057] The top of the primary valve housing 21 is provided with a cylindrical support portion 210, and the secondary valve housing 31 is fastened to the cylindrical support portion 210 on the primary valve housing 21. A press-fit sleeve 51 is fitted around the outer periphery of the primary valve housing 21. The press-fit sleeve 51 has internal threads and is fixed to the cylindrical support portion 210 through the internal threads, thereby fixing the secondary valve housing 31. The secondary valve housing 31 and the primary valve housing 21 together form the secondary valve cavity 33. A secondary valve core 34 is provided inside the secondary valve cavity 33. The lower end of the secondary valve core 34 also has an insertion section, and the upper end has a disc-shaped structure. The disc-shaped structure guides and fits with the inner wall of the secondary valve housing 31. A sealing ring is provided on the outer peripheral surface of the disc-shaped structure to achieve sealing with the secondary valve housing 31. An axial through channel 35 is provided at the axis of the secondary valve core 34. The lower end of the axial through channel 35 is open to fit with the secondary valve seat 36 to adjust the opening degree when the secondary valve core 34 moves axially.

[0058] like Figure 2The secondary valve seat 36 is mounted on the valve core insert seat 41. The valve core insert seat 41 is a separate component, a sleeve structure, with external threads on its lower outer circumference. It is fixed to the primary valve housing 21 by these external threads, allowing for installation and removal from the secondary valve cavity 33. To improve the fixing reliability of the valve core insert seat 41, the primary valve housing 21 has a cylindrical protrusion with external threads on its inner wall, which increases the threaded connection length between the valve core insert seat 41 and the primary valve housing 21. The inner hole of the valve core insert seat 41 forms a through hole 42, the lower end of which communicates with the primary valve cavity 25, and the upper end for guiding the corresponding end of the secondary valve core 34 during insertion.

[0059] A valve seat support platform 43 is provided inside the through hole 42 of the valve core insert 41. The valve seat support platform 43 forms a downward-facing support surface, and the secondary valve seat 36 is supported on the valve seat support platform 43. A valve seat crimping member 44 is also provided inside the through hole 42. The valve seat crimping member 44 has external threads and is fixed inside the through hole 42 by the external threads, pressing and fixing the secondary valve seat 36 onto the valve seat support platform 43.

[0060] The secondary valve seat 36 is an assembly comprising a support ring 37 and a sealing block 38. The upper end of the support ring 37 is supported on a valve seat support platform 43, and the lower end of the support ring 37 has an inwardly turned portion 39, with an inner ring platform 310 at the center opening of the inwardly turned portion 39. The inner bore of the support ring 37 includes a large-diameter section 311 located on the upper side of the inwardly turned portion 39, positioned at the axial center of the support ring 37, with a diameter larger than the inner diameter of the inwardly turned portion 39. An axial through hole 314 is provided on the inwardly turned portion 39 at the lower end of the support ring 37, communicating with the large-diameter section 311 to form a connecting channel that connects the upper and lower sides of the sealing block 38. The outer circumferential surface of the support ring 37 has external threads, which connect to the through hole 42 of the valve core insert seat 41. During use, the position of the support ring 37 can be adjusted via the threads, thereby regulating the secondary pressure reduction.

[0061] The sealing block 38 is used to block the lower opening of the secondary valve core 34. The sealing block 38 is provided with an annular support step 312, which supports it on the inner annular platform 310. The support ring 37 can lift the sealing block 38 relative to the valve seat support platform 43, so that its upper side is located below the upper end face of the support ring 37, providing passage space for the gas to be depressurized. The inner annular platform 310 on the support ring 37 supports the sealing block 38 radially, which helps to reduce the axial dimension of the secondary valve seat 36, thereby reducing the axial dimension and weight of the entire gas depressurization device.

[0062] The sealing block 38 is press-fitted and fixed by the valve seat crimping member 44. Compared with the prior art, which fixes the sealing block 38 to the sealing block 38 mounting base by a screw passing through the center of the sealing block 38, it can avoid problems such as the inconvenience of screw manufacturing and installation.

[0063] The through hole 42 of the valve core insert 41 has an annular sealing section 45, which is located at the upper end of the valve seat support 43. The upper end of the support ring 37 has an inner flange, such that the inner diameter of the upper end is smaller than the inner diameter of the annular sealing section 45. The upper end face of the support ring 37 and the annular sealing section 45 together form a sealing groove, and the corresponding valve core sealing ring 46 is installed in this sealing groove 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 insert section of the primary valve core 214, which can avoid affecting the insertion of the primary valve core 214. When installing the valve core sealing ring 46, it is directly inserted into the annular sealing section 45 from the lower end of the valve core insert 41, followed by the installation of the secondary valve seat 36 and the valve seat crimping member 44. Compared to bending and deforming the valve core sealing ring 46 before inserting it into the annular sealing groove, this method avoids deformation of the valve core sealing ring 46, making installation easier and preventing damage to the valve core sealing ring 46. To ensure gas passage, the valve seat crimping member 44 is provided with connecting holes 47, which are evenly distributed circumferentially, allowing the space on both axial sides of the valve seat crimping member 44 to be connected. Furthermore, a boss is provided at the center of the upper end of the valve seat crimping member 44, and the outer periphery of the boss forms an airflow buffer space, which helps reduce airflow resistance and ensures smooth airflow. When adjusting the vertical position of the support ring 37 via threads, an adjusting shim can be placed at the upper end of the support ring 37 to ensure the integrity of the sealing ring groove.

[0064] The upper end of the primary valve core 214 has a sealing insertion section 211, which is inserted into the lower end of the through hole 42 of the valve core cartridge seat 41 and sealed with the through hole 42 by a sealing ring. The primary valve core 214 is inserted into the valve core cartridge seat 41, allowing both the primary valve core 214 and the secondary valve core 34 to be sealed through the through hole 42 on the valve core cartridge seat 41. This eliminates the need to consider external sealing of the valve core cartridge seat 41, reducing the number of sealing rings, improving sealing reliability, and lowering costs. Simultaneously, the diameter of the opening on the primary valve housing 21 for mounting the valve core cartridge seat 41 is larger than the outer diameter of the primary valve core 214 and the primary pressure regulating spring 29, allowing the primary valve core 214 and the primary pressure regulating spring 29 to also be installed from the upper side of the gas pressure reducing device, making installation more convenient. In addition, the first-stage valve core 214 is provided with an annular stop step 212, which is located below the sealing insertion section 211 and is used to press against the valve core cartridge seat 41 under the action of the first-stage pressure regulating spring 29. By adjusting the threaded connection position of the valve core cartridge seat 41 on the first-stage valve body 21, the compression amount of the first-stage pressure regulating spring 29 can be adjusted, thereby realizing the manual pressure adjustment of the first-stage pressure reducing structure.

[0065] To prevent changes in air pressure within the primary valve chamber 25 from affecting 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 circumferential surface of the valve core insert 41 is provided with external threads, which fix it to the threaded hole on the primary valve housing 21. A connecting groove 48 is provided on the outer circumferential surface of the valve core insert 41, extending axially along the threaded hole. One end of the connecting groove 48 communicates with the secondary valve chamber 33, and the other end communicates with the primary valve chamber 25. This allows the primary valve chamber 25 and the secondary valve chamber 33 to share a single breathing channel 213, which helps reduce the number of parts and lower costs. Preferably, multiple connecting grooves 48 are provided, evenly distributed along the circumference; in this embodiment, three grooves are provided. Of course, a gas passage 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 passage 213 communicates with the connecting groove 48. In this embodiment, the outer diameter of the primary valve core 214 is smaller than the inner diameter of the primary valve chamber 25, forming an annular gap with the primary valve shell 21, and the annular gap forms a gas passage. In other embodiments, the connecting groove 48 can also be provided on the inner wall of the threaded hole provided on the primary valve shell 21. In addition, in other embodiments, a through hole can also be provided on the annular stop step 212 of the primary valve core 214, relying on the through hole to form a gas passage.

[0066] When assembling the above-mentioned gas pressure reducing device, the primary pressure regulating spring 29, the primary valve core 214, the valve core insert 41 with the secondary valve seat 36 installed, the secondary pressure regulating spring 313, the secondary valve core 34, the secondary valve body 31, and the crimping sleeve 51 can be installed sequentially from top. When disassembling and maintaining the secondary pressure reducing assembly, the operation can be performed in reverse order, which makes it easier to disassemble and maintain the secondary valve seat 36 compared with the prior art.

[0067] In operation, high-pressure hydrogen enters the valve port 26 of the primary pressure reducing valve through the inlet connector 11 and filter element 24. It then passes through the radial channel 28 and axial channel 27 on the valve core and flows through the primary valve core 214, acting on its upper surface and pushing it downwards. This balances the primary valve core 214 under the combined action of the gas pressure at its upper and lower ends and the primary pressure regulating spring 29, achieving primary pressure reduction. Primary pressure reduction is mainly to withstand the gas injection impact, providing initial pressure reduction and protecting the secondary pressure reducing assembly. After primary pressure reduction, the hydrogen enters the secondary valve core 34 through the connecting hole 47 on the secondary valve seat 36. It then flows through the axial through channel 35 on the secondary valve core 34 towards the outlet connector, acting on its upper surface and pushing it downwards. This balances the secondary valve core 34 under the combined action of the gas pressure at its upper and lower ends and the secondary pressure regulating spring 313, achieving secondary pressure reduction and meeting the key performance indicators of the gas pressure reducing device. Finally, the hydrogen is discharged through the outlet channel on the outlet connector.

[0068] Example 2 of the two-stage valve seat assembly structure of the gas pressure reducing device in this invention:

[0069] The difference between this embodiment and embodiment 1 is that in embodiment 1, the secondary valve seat 36 is pressed into the valve core insert 41 by the valve seat pressing member 44, while in this embodiment, the secondary valve seat 36 is welded and fixed into the valve core insert 41.

[0070] Embodiment 3 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0071] 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 36 is an integral structure.

[0072] Example 4 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0073] The difference between this embodiment and embodiment 1 is that in embodiment 1, the sealing ring groove on the valve core insert 41 for installing the valve core sealing ring 46 is formed by the support ring 37 and the valve seat insert, while in this embodiment, the sealing ring groove is an annular groove provided on the inner wall of the through hole 42 of the valve seat insert, and the support ring 37 only serves to support the sealing block 38.

[0074] Embodiment 5 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0075] The difference between this embodiment and embodiment 1 is that in embodiment 1, the support ring 37 is provided with external threads and is threadedly connected to the through hole 42 on the valve seat insert, while in this embodiment, the outer circumferential surface of the support ring 37 is smooth and is pressed and fixed in the valve seat insert by the valve seat pressing member 44.

[0076] Embodiment 6 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0077] The difference between this embodiment and embodiment 1 is that in embodiment 1, the upper end of the primary valve core 214 is guided and inserted into the valve core insert seat 41 and sealed with the valve core insert seat 41. In this embodiment, the upper end of the primary valve core 214 can also be separated from the valve core insert seat 41 and form a guided and sealed fit with the inner wall surface of the primary valve cavity 25.

[0078] Embodiment 7 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0079] The difference between this embodiment and embodiment 1 is that in embodiment 1, the valve core insert 41 can block the first-stage valve core 214, while in this embodiment, the valve core insert 41 is designed to remain separate from the first-stage valve core 214, and the first-stage valve cavity 25 is provided with a downward-facing support step surface, which blocks the first-stage valve core 214.

[0080] Example 8 of the secondary valve seat assembly structure of the gas pressure reducing device of the present invention:

[0081] The difference between this embodiment and embodiment 1 is that in embodiment 1, the valve core cartridge seat 41 is provided with external threads and can be detachably fixed to the first-stage valve body 21 by threaded connection, while in this embodiment, the lower end of the valve core cartridge seat 41 is provided with a connecting flange and is fixed to the first-stage valve body 21 by flange and screws.

[0082] Example 9 of the two-stage valve seat assembly structure of the gas pressure reducing device of the present invention:

[0083] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the secondary valve core 34 has an axially penetrating channel 35, and the secondary valve seat 36 includes a sealing block 38, which is adapted to the lower opening of the axially penetrating channel 35. In this embodiment, the structure of the insert section on the secondary valve core 34 is the same as that of the insert section of the primary valve core 214, and its flow channels include an axial channel 27 and a radial channel 28, and a sealing block 38 is provided on the bottom surface. The structure of the secondary valve seat 36 is the same as that of the primary valve seat 23, with a vertically penetrating flow channel at the axial center, and a clearance hole at the axial center of the corresponding valve seat pressing part 44 for gas to pass through. Of course, in other embodiments, the secondary valve seat 36 in this embodiment can also be fixed to the valve core insert seat 41 in other ways, such as welding, or using an integral structure.

[0084] The above description is merely 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 shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. The secondary valve seat assembly structure of the gas pressure reducing device includes: The first-stage valve housing (21) has a first-stage valve chamber (25) inside, and a first-stage valve core (214) is provided inside the first-stage valve chamber (25). The secondary valve housing (31) is detachably connected to the primary valve housing (21) and together with the primary valve housing (21) forms the secondary valve cavity (33), and the secondary valve core (34) is provided in the secondary valve cavity (33). The secondary valve seat assembly structure is characterized by further comprising: Valve core insert (41) is a separate component that can be detachably fixed on the primary valve housing (21) and can be disassembled and assembled from the secondary valve chamber (33). The valve core insert seat (41) is provided with a through hole (42). The end of the through hole (42) near the first-stage valve core (214) faces the first-stage valve cavity (25), and the end away from the first-stage valve core (214) is used for the corresponding end of the second-stage valve core (34) to be inserted. A secondary valve seat (36) is provided inside the through hole (42). The secondary valve seat (36) is used to adapt to the secondary valve core (34) to achieve opening adjustment when the secondary valve core (34) moves axially.

2. The two-stage valve seat assembly structure according to claim 1, characterized in that, A valve seat support platform (43) is provided on the wall of the through hole (42). The valve seat support platform (43) forms a support surface facing the first-stage valve core (214). The second-stage valve seat (36) is supported on the valve seat support platform (43). The through hole (42) is also provided with a valve seat crimping member (44), which has an external thread. It is fixed in the through hole (42) by the external thread, and the secondary valve seat (36) is pressed and fixed on the valve seat support platform (43). The valve seat crimping member (44) is provided with a connecting hole (47) so that the space on both sides of the valve seat crimping member (44) is connected in the axial direction.

3. The secondary valve seat assembly structure according to claim 2, characterized in that, The secondary valve seat (36) includes: The support ring (37) has one end facing away from the first-stage valve core (214) supported on the valve seat support platform (43); The sealing block (38) is located on the side of the support ring (37) near the first-stage valve core (214) and is used to block the corresponding end opening of the second-stage valve core (34); The support ring (37) has a connecting channel on the radially outer part of the sealing block (38), which connects the two axial sides of the sealing block (38).

4. The secondary valve seat assembly structure according to claim 3, characterized in that, The support ring (37) has an inwardly turned portion (39) at one end near the first-stage valve core (214). The inner hole of the support ring (37) includes a large-diameter section (311) located on the side of the inwardly turned portion (39) facing away from the first-stage valve core (214). The diameter of the large-diameter section (311) is larger than the inner diameter of the inwardly turned portion (39). The inward-turned portion (39) is provided with an axial through hole (314), which is connected to the large-diameter section (311) and together with the large-diameter section (311) forms the connecting channel.

5. The secondary valve seat assembly structure according to claim 4, characterized in that, The sealing block (38) and the support ring (37) are arranged separately. The inner ring platform (310) is provided at the center opening of the inward-turned part (39), and the sealing block (38) is supported on the inner ring platform (310).

6. The secondary valve seat assembly structure according to claim 3 or 4, characterized in that, A valve core sealing ring (46) is provided at the end of the through hole (42) away from the first-stage valve core (214). The through hole (42) has an annular sealing section (45), which is located on the side of the valve seat support platform (43) facing away from the first-stage valve core (214). The inner diameter of the end of the support ring (37) facing away from the first-stage valve core (214) is smaller than the inner diameter of the annular sealing section (45). The end face of the support ring (37) and the annular sealing section (45) together form a sealing groove for the valve core sealing ring (46) to be installed.

7. The secondary valve seat assembly structure according to claim 3 or 4, characterized in that, The outer circumferential surface of the support ring (37) is provided with external threads, and is connected to the through hole (42) of the valve core insert seat (41) through the external threads.

8. The secondary valve seat assembly structure according to any one of claims 1 to 4, characterized in that, The valve core insert (41) has an external thread on its outer circumferential surface and is fixed to the first-stage valve body (21) by the external thread.

9. The secondary valve seat assembly structure according to any one of claims 1 to 4, characterized in that, The first-stage valve core (214) has a sealing plug section (211) at one end near the second-stage valve core (34). The sealing plug section (211) is inserted into the through hole (42) at one end near the first-stage valve core (214) and is sealed with the through hole (42) by a sealing ring.

10. The secondary valve seat assembly structure according to claim 9, characterized in that, The valve core insert (41) has an external thread on its outer circumferential surface and is fixed in the threaded hole on the first-stage valve body (21) by the external thread; A connecting groove (48) is provided on the outer peripheral surface of the valve core insert (41) and / or on the inner wall of the threaded hole. The connecting groove (48) extends along the axial direction of the threaded hole, with one end connected to the secondary valve chamber (33) and the other end connected to the primary valve chamber (25). A gas passage is provided on the first-stage valve core (214) or between the first-stage valve core (214) and the inner wall of the first-stage valve chamber (25), so that the connecting groove (48) is connected to the breathing passage (213) on the first-stage valve shell (21) or the second-stage valve shell (31).

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