Valve core sealing plug-in structure of vehicle pressure reducing device

Abstract

The application relates to a valve core sealing plug-in structure of a vehicle pressure reducing device. The valve core sealing plug-in structure of the vehicle pressure reducing device comprises a valve cover body, a valve core mounted in a valve core mounting cavity in the valve cover body and guided and assembled; a plug-in section is arranged on the side of the valve core away from the valve cover body, an axial through channel is arranged on the axis of the plug-in section; a cover body connecting seat is provided with a valve core plug-in hole, a plug-in sealing ring groove is arranged on the hole wall of the valve core plug-in hole; a sealing sleeve mounting hole is arranged on the cover body connecting seat, and a sealing sleeve is fixed in the sealing sleeve mounting hole; the valve core sealing plug-in structure further comprises an annular sealing support, the plug-in section of the valve core can pass through the annular sealing support, and the sealing sleeve is pressed on the annular sealing support; at least one of the sealing sleeve or the annular sealing support is provided with an inner ring table, and the inner ring tables jointly enclose the plug-in sealing ring groove. The above scheme can solve the problems of inconvenient installation of the valve core sealing plug-in structure of the vehicle pressure reducing device in the prior art and easy damage of the plug-in section sealing ring.

Description

TECHNICAL FIELD

[0001] The application relates to a valve core sealing plug-in structure of a vehicle pressure reducing device. BACKGROUND

[0002] Fluid pressure reducing devices are used in many fields, for example, in the control technology of hydrogen fuel cell vehicle hydrogen energy system, a high-pressure hydrogen fluid pressure reducing device is a key component. At present, with the rapid development of the new energy vehicle market, hydrogen fuel cell vehicles gradually become an important exploration direction for solving energy resource crisis and environmental crisis. However, for the hydrogen fuel cell vehicle, the pressure of the hydrogen storage system determines the hydrogen storage capacity, and the current higher hydrogen storage system hydrogen storage pressure can reach 70Mpa, while the hydrogen input pressure required by the electric pile is only 1Mpa-2Mpa, so a fluid pressure reducing device needs to be arranged between the gas outlet system and the electric pile for pressure reduction, and the fluid pressure reducing device often includes two-stage pressure reducing valves.

[0003] The fluid pressure reducing device in the prior art, for example, the patent document with the publication number CN211423455U discloses a valve assembly for a gas storage system, which comprises a valve body, a first-stage pressure reducing valve and a second-stage pressure reducing valve connected in sequence on the valve body. The valve cover body of the second-stage pressure reducing valve is provided with a valve core mounting cavity, and a second-stage valve core is guided and assembled in the valve core mounting cavity; the side of the second-stage valve core away from the valve cover body is provided with a plug-in section, and the axis of the plug-in section is provided with an axially-through fluid passage; the valve cover body of the first-stage pressure reducing valve constitutes a cover body connecting seat of the second-stage pressure reducing valve, and is provided with a valve core plug-in hole, the plug-in section of the valve core is guided and plugged into the valve core plug-in hole, and the plug-in section and the hole wall of the valve core plug-in hole are provided with a plug-in sealing ring groove for installing a plug-in sealing ring.

[0004] However, during assembly, the plug-in sealing ring needs to be bent and deformed before being assembled into the plug-in sealing ring groove, which is inconvenient to install and is easy to damage the plug-in sealing ring. SUMMARY

[0005] The application aims to provide a valve core sealing plug-in structure of a vehicle pressure reducing device, which solves the problems of inconvenient installation and easy damage to the plug-in sealing ring of the valve core sealing plug-in structure of the vehicle pressure reducing device in the prior art.

[0006] The valve core sealing plug-in structure of the vehicle pressure reducing device in the application adopts the following technical scheme:

[0007] The valve core sealing plug-in structure of the vehicle pressure reducing device comprises:

[0008] The valve cover body is provided with a valve core mounting cavity in the valve cover body, and a valve core is guided and assembled in the valve core mounting cavity; the side of the valve core away from the valve cover body is provided with a plug-in section, and the axis of the plug-in section is provided with an axially-through passage;

[0009] The cover connecting seat is provided with a valve core insertion hole, an insertion section of the valve core is guided and inserted into the valve core insertion hole, an insertion sealing ring groove is arranged on a hole wall of the valve core insertion hole for installing an insertion section sealing ring;

[0010] The cover connecting seat is provided with a sealing sleeve installation hole, a sealing sleeve is fixed in the sealing sleeve installation hole, and the sealing sleeve is used for guiding and inserting the insertion section of the valve core; the sealing sleeve is in sealing cooperation with the sealing sleeve installation hole;

[0011] The valve core sealing insertion structure further comprises an annular sealing support, the insertion section of the valve core can pass through the annular sealing support, and the sealing sleeve is press-fitted on the annular sealing support;

[0012] An inner ring table is arranged at one end of the sealing sleeve close to the annular sealing support, and the inner ring table and an end surface of the annular sealing support enclose the insertion sealing ring groove; or an inner ring table is arranged at one end of the annular sealing support close to the sealing sleeve, and the inner ring table and an end surface of the sealing sleeve enclose the insertion sealing ring groove; or inner ring tables are arranged at mutually close ends of the sealing sleeve and the annular sealing support, and the inner ring tables of the two enclose the insertion sealing ring groove.

[0013] Beneficial effects: by the inner ring table between the sealing sleeve and the annular sealing support, after the sealing sleeve is installed into the sealing sleeve installation hole arranged on the cover connecting seat and press-fitted on the annular sealing support, the sealing sleeve and the annular sealing support can enclose the insertion sealing ring groove in a split form, the insertion section sealing ring can be pre-installed in the inner ring table without being bent, compared with the prior art, the installation is convenient, the insertion section sealing ring is not easy to be damaged, the insertion section of the valve core can pass through the annular sealing support, the normal guiding and insertion of the valve core are not affected, at the same time, the insertion section sealing ring is arranged on the hole wall of the valve core insertion hole, compared with being arranged on the insertion section of the valve core, the channel wall of the axial through channel on the insertion section does not need to be arranged to be relatively thick, which is beneficial to ensuring the flow area.

[0014] As a preferred technical solution: the annular sealing support is a separate part, and is arranged separately from the cover connecting seat and is assembled on the cover connecting seat.

[0015] Beneficial effects: the above technical solution is convenient for material selection and processing of the annular sealing support.

[0016] As a preferred technical solution: the annular sealing support is supported on a valve seat, the valve seat is provided with a communication hole, the guiding direction of the valve core is the up-down direction, the communication hole penetrates the valve seat along the up-down direction, and the distance between the orifice of the end of the communication hole close to the valve core and the center of the valve seat is greater than the outer diameter of the insertion section;

[0017] The side of the annular sealing support away from the sealing sleeve is provided with a groove, or the side of the valve seat towards the annular sealing support is provided with a groove, the orifice of the communication hole near one end of the valve core communicates with the groove, so that the axial through channel on the valve core communicates with the communication hole.

[0018] Beneficial effects: the groove can ensure that the fluid from the communication hole on the valve seat smoothly enters the axial through channel on the plug-in section, meeting the assembly requirement that the annular sealing support is supported on the valve seat.

[0019] As a preferred technical solution: the annular sealing support is an annular sealing gasket.

[0020] Beneficial effects: the annular sealing support using the annular sealing gasket is conducive to reducing the axial size and weight of the vehicle pressure relief device.

[0021] As a preferred technical solution: the bottom of the sealing sleeve mounting hole is provided with a support ring table, the valve seat is supported on the support ring table, and the valve seat is fixed on the support ring table under the pressure connection of the annular sealing support and the sealing sleeve in sequence.

[0022] Beneficial effects: the above technical solution is convenient for processing and assembly of the valve seat.

[0023] As a preferred technical solution: the plug-in section sealing ring is an O-shaped ring or a Y-shaped sealing ring, and the opening of the Y-shaped sealing ring faces the cover body connecting seat.

[0024] As a preferred technical solution: the sealing sleeve is provided with external threads, and the threads are connected in the sealing sleeve mounting hole.

[0025] Beneficial effects: the above technical solution can conveniently realize the connection of the sealing sleeve, and easily ensure the reliable pressure connection of the sealing sleeve to the annular sealing support.

[0026] As a preferred technical solution: the end of the sealing sleeve away from the cover body connecting seat is provided with a rotary driving structure for connecting an operating tool to drive the sealing sleeve to rotate.

[0027] Beneficial effects: the above technical solution is convenient for installation of the sealing sleeve, and is conducive to ensuring installation reliability.

[0028] As a preferred technical solution: a sleeve body sealing ring is arranged between the outer circumferential surface of the sealing sleeve and the hole wall of the sealing sleeve mounting hole, so that the sealing sleeve and the sealing sleeve mounting hole are sealingly matched.

[0029] Beneficial effects: the above technical solution is convenient for realizing the sealing between the sealing sleeve and the cover body connecting seat, and improves reliability.

[0030] As a preferred technical scheme: the outer circumferential surface of the sealing sleeve is provided with an annular groove, and the annular groove is used for accommodating the sleeve sealing ring; the top opening of the sealing sleeve mounting hole is provided with a large diameter section, and the matching part of the sleeve sealing ring and the sealing sleeve mounting hole is located at the bottom of the large diameter section.

[0031] Beneficial effects: by using the above technical scheme, when the sleeve sealing ring is installed, the large diameter section can avoid the sleeve sealing ring, which is beneficial to reduce the friction between the sleeve sealing ring and the sealing sleeve mounting hole, and can protect the sleeve sealing ring. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a perspective view of the vehicle pressure reducing device corresponding to the valve core sealing plug-in structure of the vehicle pressure reducing device of embodiment 1 in the application Figure 1 ;

[0033] Figure 2 is a perspective view of the vehicle pressure reducing device corresponding to the valve core sealing plug-in structure of the vehicle pressure reducing device of embodiment 1 in the application Figure 2 ;

[0034] Figure 3 is the A-A sectional view of Figure 1 ;

[0035] Figure 4 is the B-B sectional view of Figure 1 ;

[0036] Figure 5 is a functional principle diagram of the vehicle pressure reducing device

[0037] Figure 6 is a structural schematic view of another embodiment of the valve core sealing plug-in structure of the vehicle pressure reducing device in the application

[0038] The names of the components corresponding to the corresponding reference signs in the figures are: 11, air inlet joint; 12, high pressure sensor interface; 21, cover body connecting seat; 22, fixing hole; 23, secondary valve seat mounting cylinder; 24, mounting counterbore; 25, connecting cylinder; 26, breathing passage; 27, breathing valve; 28, connecting passage; 29, support ring table; 31, primary valve seat; 32, boss; 33, valve port; 41, primary valve core; 42, guide section; 43, primary pressure regulating spring; 44, plug-in section; 45, plug-in sealing ring; 46, primary sealing block; 47, flow channel; 48, avoidance port; 51, valve seat compression fitting; 52, air inlet passage; 53, annular protrusion; 54, flange structure; 55, fixing screw; 61, filter element; 62, annular flange; 71, secondary valve seat; 72, secondary valve core; 73, secondary pressure regulating spring; 74, secondary sealing block; 75, conical boss; 76, communication hole; 77, plug-in section sealing ring; 78, axial through passage; 79, plug-in section; 81, annular step; 82, sealing sleeve; 83, annular sealing support; 84, compression sleeve; 85, plug-in sealing ring groove; 86, sealing sleeve mounting hole; 87, groove; 88, operation hole; 89, inner ring table; 91, valve cover body; 92, low pressure sensor interface; 93, safety valve; 94, service port; 95, valve core mounting cavity. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application 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 used to explain the present application and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0040] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] It should be noted that the terms "first" and "second" and the like in the specific embodiments of the present application can only be used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof appearing in the present application are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. The statement "including a……" appearing in the present application does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" appearing in the present application should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the description of the present application, unless otherwise explicitly specified and limited, the term "provided with" appearing in the present application should be understood broadly, for example, the object "provided with" can be part of the body, or arranged separately from the body and connected to the body, which connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] The present application will be further described in detail below in combination with the embodiments.

[0045] Embodiment 1 of the valve core sealing plug-in structure of the vehicle pressure reducing device in the present application:

[0046] The vehicle pressure reducing device in the present embodiment is a high-pressure hydrogen vehicle pressure reducing device, which is used in hydrogen energy vehicles. As shown in Figure 1 and Figure 2 , the vehicle pressure reducing device comprises an air inlet connector 11, a main valve body (i.e. a cover body connecting seat 21), a compression sleeve 84 and an air outlet connector (i.e. a valve cover body 91). The main valve body is provided with a fixing hole 22 for fixing the vehicle pressure reducing device; the main valve body is provided with a primary pressure reducing valve and a secondary pressure reducing valve, which can realize two-stage pressure reduction. As shown in Figure 3 , Figure 4 and Figure 5The high-pressure sensor interface 12 is arranged on the air inlet joint 11. The safety valve 93, the low-pressure sensor interface 92 and the service port 94 are arranged on the air outlet joint formed by the valve cover body 91, and the valve core mounting cavity 95 is arranged in the air outlet joint, for guiding and assembling the secondary valve core 72.

[0047] For the convenience of clearly describing the embodiments of the application, in the following description, the end of the vehicle pressure reducing device provided with the air inlet joint 11 is referred to as the lower end, and the end provided with the air outlet joint is referred to as the upper end, and the direction of the vehicle pressure reducing device is consistent with the direction shown in the drawings. Figure 3 Of course, the above-mentioned "upper" and "lower" cannot be used to limit the actual placement state or use state of the vehicle pressure reducing device. The vehicle pressure reducing device can be arranged horizontally, obliquely or vertically. When arranged vertically, the end of the air inlet joint 11 can also be upward.

[0048] Specifically, as shown in Figure 3 and Figure 4 The valve cavity of the primary pressure reducing valve is arranged on the main valve body, and the main valve body forms the valve cavity shell of the primary pressure reducing valve. The primary valve core 41 and the primary pressure regulating spring 43 are assembled in the valve cavity of the primary pressure reducing valve. The primary valve core 41 is guided upward and downward, and the upper end is supported on the annular stop step arranged on the cover body connecting seat 21. The primary pressure regulating spring 43 is used to provide an upward movement force for the primary valve core 41 to move away from the valve port 33. In order to facilitate the correction of the pressure reduction pressure, the lower end of the primary pressure regulating spring 43 is provided with a primary valve adjusting gasket. The thickness of the primary valve adjusting gasket is 0.1 or 0.2 mm. The adjustment of the pressure reduction pressure is realized by increasing or decreasing the number of primary valve adjusting gaskets. The top of the cover body connecting seat 21 is provided with a secondary valve seat mounting cylinder 23 at the center position for assembling the secondary valve seat 71. The top of the primary valve core 41 is provided with a guide section 42, and the guide section 42 is provided with a sealing ring groove. The sealing ring groove is provided with a sealing ring. The sealing ring makes the guide section 42 and the inner wall of the secondary valve seat mounting cylinder 23 in sliding sealing cooperation.

[0049] The lower end of the cover body connecting seat 21 is provided with a mounting counterbore 24, and the mounting counterbore 24 is embedded with the valve seat 31 of the primary pressure reducing valve. The valve seat 31 of the primary pressure reducing valve is provided with a valve core insertion hole, and the hole bottom of the valve core insertion hole is provided with a valve port 33. The lower end of the primary valve core 41 is provided with an insertion section 44, which is inserted into the valve core insertion hole. The hole wall of the valve core insertion hole and the outer peripheral surface of the insertion section 44 of the valve core are provided with an insertion sealing ring 45. The lower end surface of the primary valve core 41 is embedded with a primary sealing block 46, which is used to cooperate with the valve port 33 to form a certain opening degree and play a pressure reduction role. The inside of the primary valve core 41 is provided with a flow channel 47 for leading to the secondary pressure reducing valve of the vehicle pressure reducing device. The flow channel 47 includes an axial passage and a radial passage. The radial passage is arranged on the small-diameter section below the insertion sealing ring 45, and the outer end communicates with the annular gap between the primary valve core 41 and the hole wall of the valve core insertion hole, and the inner end communicates with the axial passage.

[0050] The outer circumferential surface of the valve seat 31 is a smooth cylindrical surface, and the outer diameter is adapted to the inner diameter of the mounting counterbore 24 to achieve radial positioning. The valve seat 31 can be assembled in place in a relatively translatable manner along the axial direction of the valve core insertion hole. The top end surface of the valve seat 31 is supported on the hole bottom wall of the mounting counterbore 24 to achieve axial positioning. The vehicle pressure reducing device further comprises a valve seat compression member 51, which is an air inlet connector 11. The air inlet connector 11 is provided with an air inlet passage 52, which penetrates the air inlet connector 11 along the axial direction of the valve core insertion hole. The valve port 33 is located on the extension path of the air inlet passage 52, and the air inlet passage 52 is connected to the valve port 33 of the valve seat 31. The end of the valve seat 31 away from the primary valve core 41 is provided with a boss 32, and the boss 32 and the hole wall of the mounting counterbore 24 form an annular gap. The side of the valve seat compression member 51 close to the valve seat 31 is provided with an annular protrusion 53, which is embedded in the annular gap to achieve radial positioning. The upper end surface of the air inlet connector 11 is pressed against the lower end surface of the boss 32 to fix the valve seat 31 on the cover body connecting seat 21. The valve seat compression member 51 is provided with a flange structure 54, and a screw is threaded through the flange structure 54 to fix the valve seat compression member 51 to the cover body connecting seat 21 to form a fixed structure, which fixes the valve seat 31 relative to the cover body connecting seat 21 when assembled in place. To prevent gas leakage from the joint between the air inlet passage 52 and the valve port 33, a sealing ring is provided between the air inlet connector 11 and the valve seat 31, and the sealing ring is arranged in the annular groove on the lower end surface of the valve seat 31. The end surface of the annular protrusion 53 and the valve seat 31 have a gap, which can ensure the compression of the sealing ring on the valve seat 31 and the sealing between the valve seat 31 and the air inlet connector 11.

[0051] The inner end of the air inlet passage 52 of the air inlet connector 11 is embedded with a filter core 61, which is a hollow cylindrical structure with a U-shaped longitudinal section. The opening of the U-shaped filter core 61 faces the valve port 33, and the outer side of the open end of the valve core is provided with an annular flange 62, which is supported on the end of the air inlet connector 11 facing the valve seat 31. The high pressure sensor interface 12 on the air inlet connector 11 is perpendicular to the air inlet passage 52, and the inner end corresponds to the lower end of the filter core 61. The lowermost end of the air inlet connector 11 is provided with an external thread for connecting to a corresponding pipeline.

[0052] The secondary pressure reducing valve is arranged above the primary pressure reducing valve, and comprises a secondary valve seat 71, a secondary valve core 72 and a secondary pressure regulating spring 73. The inner hole of the secondary valve seat mounting cylinder 23 forms a sealing sleeve mounting hole 86 for the sealing sleeve 82. The secondary valve seat 71 is arranged at the bottom of the sealing sleeve mounting hole 86 formed by the secondary valve seat mounting cylinder 23. The lower end of the secondary valve seat 71 is supported on the support ring table 29 on the inner wall of the secondary valve seat mounting cylinder 23, and the upper end is sequentially provided with an annular sealing support 83 and a sealing sleeve 82. The sealing sleeve 82 is provided with external threads on the end surface opposite to the end of the cover body connecting seat 21, and is screwed on the secondary valve seat mounting cylinder 23 and fixed by the annular sealing support 83. The end surface of the sealing sleeve 82 opposite to the end of the cover body connecting seat 21 is uniformly provided with operation holes 88 for inserting an operation tool with a plug-in column to form a rotary driving structure for connecting an operation tool to drive the sealing sleeve 82 to rotate. Of course, in other embodiments, the rotary driving structure can also be other structures, such as an external hexagonal structure. A sleeve body sealing ring is arranged between the sealing sleeve 82 and the inner wall of the secondary valve seat mounting cylinder 23. An annular groove is arranged on the outer circumferential surface of the sealing sleeve 82 for the sleeve body sealing ring. A large diameter section is arranged at the top opening of the sealing sleeve mounting hole 86. The matching part of the sleeve body sealing ring and the sealing sleeve mounting hole 86 is located at the lower part of the large diameter section, which can avoid damage to the sleeve body sealing ring between the sealing sleeve 82 and the secondary valve seat mounting cylinder 23. The side of the secondary valve core 72 opposite to the valve cover 91 is provided with a plug-in section 79 which is guided and plugged into the valve core plug-in hole formed by the sealing sleeve 82 and the annular sealing support 83.

[0053] A secondary sealing block 74 is fixed to the middle part of the secondary valve seat 71 by a screw. A conical boss 75 is arranged on the lower side of the secondary valve core 72 to facilitate machining of a longer threaded hole on the secondary valve seat 71 for screw assembly. A through communication hole 76 is arranged at the radial edge of the secondary sealing block 74. The communication hole 76 penetrates the secondary valve seat 71 in the axial direction. The distance between the communication hole 76 and the center of the secondary valve seat 71 is greater than the outer diameter of the plug-in section 79, so that the gas in the valve cavity of the primary pressure reducing valve can enter the secondary pressure reducing valve.

[0054] The annular sealing support 83 is an annular sealing gasket. The side close to the sealing sleeve 82 is a flat surface, and the side opposite to the sealing sleeve 82 is provided with a groove 87 which is a sunken groove and communicates the communication hole with the radial center position of the secondary valve seat 71. The end of the sealing sleeve 82 close to the annular sealing support 83 is provided with an inner ring table 89 which surrounds the upper end surface of the annular sealing support 83 to form a plug-in sealing ring groove 85. The lower end of the secondary valve core 72 is slidingly sealed and plugged into the secondary valve seat mounting cylinder 23 through the plug-in sealing ring groove 85 between the sealing sleeve 82 and the annular sealing support 83, which guarantees the air tightness and can cooperate with the secondary sealing block 74 on the secondary valve seat 71 to form a certain opening and play a pressure reducing role when moving up and down during use.

[0055] The axial through channel 78 is communicated with the axial through gas outlet channel of the gas outlet joint. In order to reduce the axial size of the pressure reducing device, better realize the light weight and miniaturization, the top of the primary valve core 41 is provided with a relief port 48 which is a trumpet port, and the tapered boss 75 on the lower side of the secondary valve core 72 is embedded in the relief port 48, thereby saving the axial size and being able to play a role of guiding the airflow and reducing the flow resistance. Of course, in other embodiments, the relief port 48 on the top of the primary valve core 41 can also be formed by a cylindrical hole, and the part on the lower side of the secondary valve core 72 for setting the threaded hole can also be a cylindrical structure.

[0056] The low pressure sensor interface 92 and the safety valve 93 on the gas outlet joint are arranged perpendicular to the gas outlet channel, and the service port 94 is also provided on the gas outlet joint.

[0057] The upper part of the cover connecting seat 21 is provided with a connecting cylinder 25 which is coaxially arranged with the secondary valve seat mounting cylinder 23, and the annular space between the two is provided with a secondary pressure regulating spring 73, the lower end of which is directly or indirectly supported on the bottom surface of the annular space, and the upper end is supported on the secondary valve core 72, for providing the secondary valve core 72 with an upward movement force away from the valve port 33. In order to facilitate the correction of the pressure reducing pressure, the lower end of the secondary pressure regulating spring 73 is provided with a secondary valve adjusting gasket, and the thickness of the secondary valve adjusting gasket is 0.1 or 0.2 mm, and the adjustment of the pressure reducing pressure is realized by increasing or decreasing the number of secondary valve adjusting gaskets. The gas outlet joint is buckled on the top of the connecting cylinder 25 and supported on the outer ring table on the connecting cylinder 25, and the connecting cylinder 25 surrounds the valve cavity of the secondary pressure reducing valve. The crimping sleeve 84 is used to crimp the gas outlet joint to the cover connecting seat 21, specifically, the connecting cylinder 25 of the cover connecting seat 21 is provided with an external thread, and the inner wall of the crimping sleeve 84 is provided with an annular step 81, which is used to press the outer ring table provided on the outer circumferential surface of the gas outlet joint when the crimping sleeve 84 is screwed to the connecting cylinder 25, so as to press the secondary valve core 72. Similarly, the secondary valve core 72 can be pressed by the crimping sleeve 84 to avoid rotation of the secondary valve core 72 during assembly, and to avoid damage to the plug-in segment sealing ring 77 between the inner wall of the valve core plug-in hole and the secondary valve core 72 or the sealing ring between the secondary valve core 72 and the gas outlet joint.

[0058] As Figure 4The outer circumferential surface of the cover connecting base 21 is provided with a breathing passage 26 communicated with the valve cavity of the first pressure reducing valve, and the outer end of the breathing passage 26 is provided with a breathing valve 27 for avoiding the influence of the change of the air pressure in the valve cavity on the valve core movement. The bottom surface of the annular space is provided with a connecting passage 28 communicated with the breathing passage 26, so that the valve cavity of the second pressure reducing valve shares the breathing valve 27 with the valve cavity of the first pressure reducing valve, and the structure is compact.

[0059] During assembly, the valve core of the first pressure reducing valve is assembled into the mounting counterbore 24 at the lower end of the cover connecting base 21 in a translational mode, the valve core is supported on the hole bottom of the mounting counterbore 24, then the air inlet joint 11 is press-fitted onto the valve core in a translational mode, the air inlet joint 11 is fixed to the cover connecting base 21 by the fixing screw 55, and the assembly and fixation of the valve seat 31 and the cover connecting base 21 are realized. During assembly of the second pressure reducing valve, the second valve seat 71, the annular sealing support 83 and the sealing sleeve 82 are sequentially assembled into the second valve seat mounting cylinder 23 on the cover connecting base 21, the plug-in section sealing ring 77 is pre-assembled into the inner ring table 89 on the sealing sleeve 82, then the second valve core 72 is translational inserted, and finally the valve cover 91 is covered and fixed by the crimping sleeve 84.

[0060] During use, the high-pressure hydrogen gas enters the valve port 33 of the first pressure reducing valve through the air inlet joint 11 and the filter element 61, then passes through the radial passage and the axial passage on the valve core and passes through the first valve core 41, acts on the upper end surface of the first valve core 41, pushes the first valve core 41 to move downward, and the first valve core 41 is balanced under the combined action of the gas pressure at the upper and lower ends and the first pressure regulating spring 43, so that the first pressure reduction is realized. The hydrogen gas after the first pressure reduction enters the second valve core 72 from the communication hole 76 on the second valve seat 71, is discharged to the air outlet joint through the axial through passage on the second valve core 72, acts on the upper end surface of the second valve core 72, pushes the second valve core 72 to move downward, and the second valve core 72 is balanced under the combined action of the gas pressure at the upper and lower ends and the second pressure regulating spring 73, so that the second pressure reduction is realized, and finally the hydrogen gas is discharged from the air outlet passage on the air outlet joint.

[0061] Embodiment 2 of the valve core sealing plug-in structure of the vehicle pressure reducing device in the application:

[0062] The difference between the present embodiment and embodiment 1 is that in embodiment 1, the annular sealing support 83 for surrounding the plug-in sealing ring groove 85 with the sealing sleeve 82 is a separate part and is arranged separately from the cover connecting base 21 and is assembled on the cover connecting base 21; while in the present embodiment, the annular sealing support 83 and the cover connecting base 21 are an integrated structure, and the second valve seat 71 is installed from below to above the annular sealing support 83, and the installation mode is screw connection.

[0063] Embodiment 3 of the valve core sealing plug-in structure of the vehicle pressure reducing device in the application:

[0064] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the annular sealing support 83 is an annular sealing gasket; while in the embodiment, the annular sealing support 83 is a sleeve structure.

[0065] The embodiment 4 of the valve core sealing plug-in structure of the vehicle pressure reducing device in the application:

[0066] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the secondary valve seat 71 is pressed and fixed by the annular sealing support 83 and the sealing sleeve 82; while in the embodiment, the secondary valve seat 71 and the annular sealing support 83 are an integral structure.

[0067] The embodiment 5 of the valve core sealing plug-in structure of the vehicle pressure reducing device in the application:

[0068] The difference between the embodiment and the embodiment 1 is that, in the embodiment 1, the sealing sleeve 82 is fixed in the sealing sleeve mounting hole 86 on the cover body connecting seat by screw connection, while in the embodiment, the sealing sleeve 82 is welded and fixed on the cover body connecting seat 21, and the sealing sleeve 82 and the sealing sleeve mounting hole 86 are sealed and matched by welding.

[0069] Of course, in other embodiments, the sealing sleeve 82 can also adopt other fixing forms, for example, a flange is arranged on the sealing sleeve 82, and the sealing sleeve 82 is fixed with the cover body connecting seat 21 through the flange and a screw.

[0070] The vehicle pressure reducing device in the above embodiments includes a two-stage pressure reducing valve, and in other embodiments, the vehicle pressure reducing device can only be provided with a one-stage pressure reducing structure. In addition, in the above embodiments, the secondary valve core 72 and the sealing sleeve 82 are sealed through an O-shaped ring, and in other embodiments, as shown in the figure, the plug-in section sealing ring 77 between the secondary valve core 72 and the valve seat 31 pressure sleeve 82 can also be a Y-shaped sealing ring, the cross section of the Y-shaped sealing ring is Y-shaped, the opening is towards the secondary valve seat 71, and the linear self-sealing effect can be formed under the action of high-pressure hydrogen, which is beneficial to reduce the friction and improve the pressure reducing performance of the secondary pressure reducing valve. Figure 6

[0071] The above is only a preferred embodiment of the application, and is not used to limit the application, the patent protection scope of the application is subject to the claims, and any equivalent structural changes made by referring to the content of the specification and the drawings of the application should also be included in the protection scope of the application.​

Claims

1. A valve core sealing plug structure of a vehicle pressure reducing device, comprising: a valve cover body, a valve core mounting cavity is arranged in the valve cover body, and a valve core is guided and assembled in the valve core mounting cavity; a plug-in section is arranged on a side of the valve core away from the valve cover body, and an axial through channel is arranged at an axial center of the plug-in section; a cover body connecting seat, a valve core plug-in hole is arranged on the cover body connecting seat, the plug-in section of the valve core is guided and plugged into the valve core plug-in hole, a plug-in sealing ring groove is arranged on a hole wall of the valve core plug-in hole, and the plug-in sealing ring groove is used for mounting a plug-in sealing ring of the plug-in section; characterized in that a sealing sleeve mounting hole is arranged on the cover body connecting seat, a sealing sleeve is fixed in the sealing sleeve mounting hole, and the sealing sleeve is used for guiding and plugging the plug-in section of the valve core; the sealing sleeve and the sealing sleeve mounting hole are in sealing cooperation; the valve core sealing plug structure further comprises an annular sealing support, the plug-in section of the valve core can pass through the annular sealing support, the sealing sleeve is press-fitted on the annular sealing support, and the sealing sleeve and an inner hole of the annular sealing support form the valve core plug-in hole; an inner ring table is arranged at one end of the sealing sleeve close to the annular sealing support, and the inner ring table and an end surface of the annular sealing support enclose a split plug-in sealing ring groove; or an inner ring table is arranged at one end of the annular sealing support close to the sealing sleeve, and the inner ring table and an end surface of the sealing sleeve enclose a split plug-in sealing ring groove; or the mutually close ends of the sealing sleeve and the annular sealing support are each provided with an inner ring table, and the inner ring tables of the two enclose a split plug-in sealing ring groove.

2. The cartridge seal splicing structure of claim 1, wherein, The annular sealing support is a separate part and is arranged separately from the cover body connecting seat and is assembled on the cover body connecting seat.

3. The cartridge seal plug-in structure of claim 2, wherein, The valve core sealing plug structure comprises a two-stage valve seat, the annular sealing support is supported on the two-stage valve seat, a communication hole is arranged on the two-stage valve seat, the valve core is a two-stage valve core, the guiding direction of the two-stage valve core is the up-down direction, the communication hole penetrates the two-stage valve seat along the up-down direction, and the distance between the orifice of the end of the communication hole close to the two-stage valve core and the center of the two-stage valve seat is greater than the outer diameter of the plug-in section; a groove is arranged on the side of the annular sealing support away from the sealing sleeve, or a groove is arranged on the side of the two-stage valve seat facing the annular sealing support, the orifice of the end of the communication hole close to the two-stage valve core is communicated with the groove, and the axial through channel on the two-stage valve core is communicated with the communication hole.

4. A cartridge seal spigot structure according to claim 2 or 3, characterised in that, The annular sealing support is an annular sealing gasket.

5. The cartridge seal splicing structure of claim 3, wherein, A support ring table is arranged at the bottom of the sealing sleeve mounting hole, the two-stage valve seat is supported on the support ring table, and the two-stage valve seat is fixed on the support ring table under the press-fitting of the annular sealing support and the sealing sleeve in sequence.

6. The cartridge seal splicing structure of claim 1 or 2 or 3, wherein, The plug-in section sealing ring is an O-shaped ring or a Y-shaped sealing ring, and the opening of the Y-shaped sealing ring faces the cover body connecting seat.

7. The cartridge seal splicing structure of claim 1 or 2 or 3, wherein, An external thread is arranged on the sealing sleeve, and the sealing sleeve is threadedly connected in the sealing sleeve mounting hole.

8. The cartridge seal splicing structure of claim 7, wherein, A rotary driving structure is arranged at one end of the sealing sleeve away from the cover body connecting seat, and an operating tool is connected to the rotary driving structure to drive the sealing sleeve to rotate.

9. The cartridge seal splicing structure of claim 1 or 2 or 3, wherein, A sleeve body sealing ring is arranged between the outer peripheral surface of the sealing sleeve and the hole wall of the sealing sleeve mounting hole, so that the sealing sleeve and the sealing sleeve mounting hole are in sealing cooperation.

10. The cartridge seal splicing structure of claim 9, wherein, An annular groove is arranged on the outer peripheral surface of the sealing sleeve, the sleeve body sealing ring is arranged in the annular groove, a large-diameter section is arranged at the top opening of the sealing sleeve mounting hole, and the cooperation part of the sleeve body sealing ring and the sealing sleeve mounting hole is located at the bottom of the large-diameter section.

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