CN217062190U

CN217062190U - Hydrogen fuel cell decompression combination valve

Info

Publication number: CN217062190U
Application number: CN202220622429.4U
Authority: CN
Inventors: 孙吉党; 何湘
Original assignee: Suzhou Qipan Technology Co ltd
Current assignee: Suzhou Qipan Technology Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-07-26
Anticipated expiration: 2032-03-21

Abstract

The utility model relates to the technical field of valves, concretely relates to hydrogen fuel cell decompression combination valve. The pressure relief valve comprises a housing, the casing in be provided with the check valve, check valve and temperature pressure relief device intercommunication, the check valve communicates with each other with the stop valve, the stop valve is connected with the relief pressure valve, check valve, temperature pressure relief device, stop valve and relief pressure valve all set up in the casing. The beneficial effects of the utility model reside in that: the utility model discloses integrateed check valve, TPRD temperature pressure release, when ambient temperature reached 110 ℃ + -5 ℃, inside glass bubble was broken, and the passageway is opened to gaseous extrusion plunger, and the inside gas of gas cylinder flows from the passageway of opening. The pressure sensor interface is directly communicated with the inside of the gas cylinder, the gas pressure in the gas cylinder can be monitored at any time, the existing pressure reducing valve can monitor the pressure only after the stop valve is opened, meanwhile, the whole structure is optimized, and compared with similar products, the weight is reduced by more than 25%.

Description

Hydrogen fuel cell decompression combination valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to hydrogen fuel cell decompression combination valve.

Background

Present hydrogen fuel cell for unmanned aerial vehicle decompression combination valve all possesses the relief pressure valve, the stop valve, multiple functions such as check valve, the valve installation dispersion of these multiple single functions, adopt the pipeline to connect mostly between each single function valve, greatly increased hydrogen fuel cell's dead weight, unmanned aerial vehicle's time of endurance and work load have been reduced, simultaneously because the existence of pipe joint, the inevitable meeting of connection between them increases the risk of revealing, there is the hidden danger in unmanned aerial vehicle's use.

The existing valve simultaneously has the problems of insufficient necessary functional parts of the valve body, heavy weight, incapability of meeting the use requirement of outlet pressure and flow and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hydrogen fuel cell decompression combination valve, it can solve that current valve pipeline connects many, the weight is heavy, export pressure and flow can not reach operation requirement scheduling problem.

The technical scheme of the utility model as follows: the utility model provides a hydrogen fuel cell combination valve that reduces pressure, includes the casing, the casing in be provided with the check valve, check valve and temperature pressure bleeder mechanism intercommunication, the check valve communicates with each other with the stop valve, the stop valve is connected with the relief pressure valve, check valve, temperature pressure bleeder mechanism, stop valve and relief pressure valve all set up in the casing.

The casing in open and to have first passageway, first passageway in be equipped with the check valve, the check valve include inflation inlet and one-way valve seat, one-way valve core subassembly and check valve spring, inflation inlet and one-way valve seat connect the one end at first passageway, it has the through-hole to open in inflation inlet and the one-way valve seat, the lower terminal surface and the one-way valve core subassembly of inflation inlet and one-way valve seat form sealedly, the inflation inlet blanking cover is connected in inflation inlet and one-way valve seat, the below of inflation inlet blanking cover is equipped with the inflation inlet filter, is provided with the one-way valve core subassembly in the first passageway of the casing that is located inflation inlet and one-way valve seat lower part, the one end endotheca that the one-way valve core subassembly is close to inflation inlet and one-way valve seat is equipped with the end cap, the other end of one-way valve core subassembly is opened has the blind hole, the blind hole endotheca check valve spring is equipped with.

The first passageway in be located the below of check valve and be provided with temperature pressure relief device, temperature pressure relief device include the plunger, glass bubble and block, the plunger sets up in the first passageway in the lower part of the casing that is located check valve core subassembly, open the lower part of plunger have with glass bubble appearance matched with blind hole, insert the upper portion of glass bubble in the blind hole, the below of glass bubble is the block, it has a horn mouth form through-hole to open on the block, the block is fixed the glass bubble between block and plunger, the block is connected with the casing.

The casing open and to have the second passageway, the one end of second passageway in install the stop valve, the stop valve including connecting the lock nut in the second passageway, install the nut in the lock nut, the nut is connected with the valve rod, the valve rod is shaft-like structure, the head of valve rod is the round platform form, the second passageway in close contact with of the shaft-like portion of valve rod and casing, form the space between the head of its round platform form and the passageway of casing, the below of valve rod is provided with the disk seat, the disk seat intermediate position has one and valve rod head matched with round hole.

The pressure reducing valve comprises a first-stage high-pressure reducing valve and a second-stage low-pressure reducing valve.

The first-stage high-pressure reducing valve comprises a high-pressure valve seat, a high-pressure valve core sleeve, a high-pressure valve core and a high-pressure seal head, wherein the high-pressure valve seat is arranged below the valve seat of the stop valve, an inclined hole is formed in the high-pressure valve seat, the high-pressure valve core sleeve is arranged below the high-pressure valve seat, a circular groove is formed in the top of one end of the high-pressure valve core sleeve and communicated with the inclined hole of the high-pressure valve seat, a cavity structure is arranged in the middle of the high-pressure valve core sleeve, the high-pressure valve core is arranged in the cavity structure, the high-pressure seal head is arranged below the high-pressure valve core sleeve and connected with a second channel, and the high-pressure valve core sleeve and the high-pressure valve core are limited in a second channel between the high-pressure seal head and the high-pressure valve seat of the shell.

The second-stage pressure reducing valve comprises a low-pressure end cover, a low-pressure valve rod assembly, a low-pressure spring, a low-pressure valve sleeve and a low-pressure valve seat, wherein the low-pressure end cover is connected with a blind hole in a first boss of the shell, a through hole is formed in the middle of the low-pressure end cover, the lower portion of the low-pressure end cover is sleeved in the low-pressure valve sleeve, the low-pressure valve rod assembly is arranged in a cavity between the bottom of the low-pressure end cover and the low-pressure valve sleeve, a rod-shaped portion of the low-pressure valve rod assembly is sleeved in an inward protruding flange of the low-pressure valve sleeve, a through hole is formed in the middle of the low-pressure valve rod assembly, a through hole vertically communicated with the through hole in the rod-shaped portion of the low-pressure valve rod assembly is formed in the rod-shaped portion of the low-pressure valve rod assembly, an end matched with the shape of the cavity is arranged in the cavity, a circular groove is formed in the bottom of the low-pressure valve sleeve, the low-pressure valve seat is arranged in the circular groove, and a step-shaped through hole is formed in the middle of the low-pressure valve seat.

The shell is provided with a first protruding portion and a second protruding portion, and a third protruding portion is arranged on one side face of the shell between the first protruding portion and the second protruding portion.

The second bulge is internally provided with a blind hole, and an inlet filter is arranged in the blind hole.

And the third bulge is used as a pressure sensor interface and is directly connected with the inside of the gas cylinder.

The beneficial effects of the utility model reside in that: the utility model discloses integrateed check valve, TPRD temperature pressure release, when ambient temperature reached 110 ℃ +/-5 ℃, inside glass bubble was broken, and the passageway is opened to gaseous extrusion plunger, and the inside gaseous passageway outflow of following the opening of gas cylinder. The pressure sensor interface is directly communicated with the inside of the gas cylinder, the gas pressure in the gas cylinder can be monitored at any time, the existing pressure reducing valve can monitor the pressure only after the stop valve is opened, meanwhile, the whole structure is optimized, and compared with similar products, the weight is reduced by more than 25%.

Drawings

Fig. 1 is a schematic view of an angle of a pressure reducing combination valve for a hydrogen fuel cell according to the present invention;

fig. 2 is a schematic view of an angle of a pressure reducing combination valve for a hydrogen fuel cell according to the present invention;

fig. 3 is a cross-sectional view of a pressure reducing combination valve for a hydrogen fuel cell according to the present invention;

fig. 4 is a cross-sectional view of a pressure reducing combination valve for a hydrogen fuel cell according to the present invention.

In the figure: 1 low pressure end cap, 2 low pressure stem assembly, 3 low pressure spring, 4 low pressure valve sleeve, 5 low pressure valve seat, 6 high pressure valve seat, 7 high pressure valve core sleeve, 8 high pressure valve core, 9 high pressure spring, 10 high pressure head, 11 nut, 12 stop nut, 13 valve stem, 14 valve seat, 15 plunger, 16 glass bulb, 17 cap, 18 inflation port block, 19 inflation port filter, 20 inflation port and one-way valve seat, 21 one-way valve core assembly, 22 one-way valve spring, 23 housing, 231 first boss, 232 second boss, 233 third boss, 234 first channel, 235 second channel, 236 third channel, 24 screw with gasket, 25 inlet filter, 26 first seal ring, 27 second seal ring, 28 third seal ring, 29 fourth seal ring, 30 fifth seal ring, 31 sixth seal ring, 32 seventh seal ring, 33 eighth seal ring, 34 ninth seal ring, 35 tenth seal ring, 36 eleventh sealing ring, 37 twelfth sealing ring, 38 thirteenth sealing ring, 39 fourteenth sealing ring, 40 fifteenth sealing ring, 41 plug, 42 oblique hole and 43 end.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the invention. Furthermore, in the description of the present invention, furthermore, "first", "second", "third", and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, connected through an intermediate medium, or connected to the inside of two elements. To one of ordinary skill in the art, the above terms are to be understood as meaning "a plurality" of the present invention as specified in the specification, in the sense of two or more unless specifically limited otherwise.

The utility model provides a hydrogen fuel cell decompression combination valve is with gas charging port, check valve, stop valve, relief pressure valve, Temperature Pressure Relief Device (TPRD), pressure sensor interface, the whole integrations of filter on a valve body.

As shown in fig. 1 and 2, a hydrogen fuel cell pressure reduction combination valve comprises a housing 23, wherein the housing 23 has a rectangular main body structure, a first convex portion 231 (shown in fig. 1) and a second convex portion 232 (shown in fig. 1) are respectively arranged on two sides of the largest area of the housing 23, a third convex portion 233 (shown in fig. 1) is arranged on one side surface of the housing 23 between the first convex portion 231 and the second convex portion 232, the third convex portion 233 is a hexagonal protrusion, an internal thread is arranged in the third convex portion, the internal thread is a pressure sensor interface and is used for connecting a pressure sensor, the hexagon is used for applying a reverse torque when screwing the pressure sensor, a stop nut 12, an inflation inlet blocking cover 18 and a screw 24 with a cushion are connected to one end (shown in fig. 1) of the housing 23, a high-pressure head 10, a high-pressure head 232 and a high-pressure head 24 are connected to the other end (shown in fig. 2) of the housing 23, A cap 17 and a padded screw 24.

As shown in fig. 3, the housing 23 has a plurality of passages formed therethrough, including a first passage 234 and a second passage 235, a check valve is disposed in the first passage 234, the one-way valve comprises an inflation inlet, a one-way valve seat 20, a one-way valve core assembly 21 and a one-way valve spring 22, wherein the charging port and the check valve seat 20 are connected to one end of the first passage 234 of the housing 23 by a screw structure, the inflation inlet and the one-way valve seat 20 are columnar structures, the inflation inlet and the one-way valve seat 20 are internally provided with step-shaped through holes with different diameters, the lower end face of the small hole at the lower end has the function that the inflation inlet and the one-way valve seat 20 form sealing with the one-way valve core assembly 21, the inflation inlet blocking cover 18 is connected in the inflation inlet and the one-way valve seat 20 through a thread structure, the inflation inlet blocking cover 18 has the function that if the one-way valve fails, sealing can be formed, and meanwhile, the inflation inlet plugging cover 18 can be replaced by a special inflation tool for inflation. As shown in fig. 3, the charging port block cover 18 is a rod-shaped structure, the middle of the charging port block cover 18 is a stepped blind hole, the hydrogen storage system of the hydrogen fuel cell unmanned aerial vehicle is charged through the charging port, the charging port block cover 18 is connected to the charging port and the one-way valve seat 20 through a threaded structure, a hexagonal hole is formed in the upper portion of the charging port block cover 18, a charging port filter 19 is arranged below the charging port block cover 18, the charging port filter 19 is located between the bottom of the charging port block cover 18 and the charging port and the one-way valve seat 20, and the charging port filter 19 is a metal sintered filter and is used for cleaning gas during charging; a columnar check valve core assembly 21 is arranged in a first channel 234 of the shell 23 positioned at the lower part of the inflation inlet and the check valve seat 20, a plug 41 with a T-shaped section is sleeved at one end, close to the inflation inlet and the check valve seat 20, of the check valve core assembly 21, a blind hole is formed at the other end of the check valve core assembly 21, a check valve spring 22 is sleeved in the blind hole, and two through holes penetrating through the blind hole are further formed in the side wall surface of the blind hole.

The utility model discloses a hydrogen fuel cell decompression combination valve aerifys the process as follows: before inflation, the inflation inlet plug cover 18 is replaced by a special inflation tool (the inflation tool is used for connecting a pipeline of inflation equipment), an inflation switch of the inflation equipment is opened, gas passes through the pipeline from the inflation equipment, passes through the inflation tool, passes through the inflation inlet filter 19, acts on the plug 41, and then generates downward force (the force is generated by different upstream and downstream pressure differences, the pressure of the inflation equipment is high, and the pressure of a hydrogen storage system is low) after acting on the plug 41, and the force can overcome the spring force of the check valve spring 22, push open the check valve core assembly 21, and enter the hydrogen storage system through a lower channel. When the inflation is completed, the force overcoming the spring force disappears, and the valve core assembly 21 of the one-way valve pushes up the valve core assembly 21 of the one-way valve under the action of the spring force of the one-way valve spring 22, so that the plug 41, the inflation inlet and the valve seat 20 of the one-way valve generate the sealing effect of the one-way valve. And then the switch of the inflation equipment is turned off, the gas release switch of the pipeline is opened, the pressure of the pipeline is released, at the moment, the gas in the hydrogen storage system cannot come out under the sealing effect, the inflation tool is taken down after the pressure of the pipeline is released, the inflation inlet plug 18 is mounted, and the inflation process is completed. When the gas charging is finished, a one-way valve spring 22 is arranged at the lower part of the one-way valve core assembly 21 through the reverse stopping function of the one-way valve, and the gas is stored in a gas cylinder of the hydrogen storage system.

As shown in fig. 3, a temperature and pressure relief device is arranged in the first channel 234 of the housing 23 below the check valve, the temperature and pressure relief device includes a plunger 15, a glass bulb 16 and a cap 17, the plunger 15 is arranged in the first channel 234 at the lower part of the housing 23 of the one-way valve spool assembly 21, an eighth sealing ring 33 is arranged at the contact part of one end (the upper end shown in fig. 3) of the plunger 15 and the first channel 234, a blind hole matched with the shape of the glass bulb 16 is formed at the lower part of the plunger 15, the upper part of the glass bulb 16 is inserted into the blind hole, the cap 17 is arranged below the glass bulb 16, a trumpet-shaped through hole is formed in the cap 17, the glass bulb 16 is fixed between the cap 17 and the plunger 15 by the cap 17, and the cap 17 is connected with the housing 23 through a thread structure.

When a fire disaster happens, when the temperature and pressure relief device reaches 110 +/-5 ℃, the glass bulb 16 is broken, the gas in the hydrogen storage system pushes the plunger 15 to move downwards until the sealing pair of the eighth sealing ring 33 fails, the high-pressure gas in the gas cylinder begins to be released, and secondary disasters are prevented.

As shown in fig. 3, a stop valve is installed in one end (upper end shown in fig. 3) of the second channel 235 of the housing 23, the stop valve includes a stop nut 12 which is connected in the second channel 235 by a thread, a nut 11 is installed in the stop nut 12, the nut 11 is connected with a valve stem 13, the valve stem 13 is of a rod-shaped structure, two annular grooves are formed in the middle of the valve stem 13, a sealing structure is installed in the annular groove, the sealing structure includes two ninth sealing rings 34, the head of the valve stem 13 is in a circular truncated cone shape, the rod-shaped portion of the valve stem 13 is in tight contact with the second channel 235 of the housing 23, a gap is formed between the circular truncated cone-shaped head and the second channel 235 of the housing 23, a third channel 236 is formed between the second channel 235 and the first channel 234 on the housing 23, one end of the third channel 236 is located on the inflation port and the first channel 234 on the lower portion of the one-way valve seat 20, one end of the third channel 236 is located on the second channel 235 on the lower portion of the valve stem 13, the third channel 236 connects the charging port and the cavity between the one-way valve seat 20 and the first channel with the cavity between the valve rod 13 and the second channel 235, the valve seat 14 is arranged below the valve rod 13, the middle position of the valve seat 14 is provided with a round hole matched with the head of the valve rod 13, the outer side of the valve seat 14 is provided with a ring groove, and the ring groove is internally provided with a tenth sealing ring 35.

The pressure reducing valve in the utility model comprises a first-stage high-pressure reducing valve and a second-stage low-pressure reducing valve, wherein the first-stage high-pressure reducing valve adopts a full unloading type form; the high-pressure valve core 8 is subjected to stress analysis, the acting force of high-pressure gas on the high-pressure valve core 8 before decompression is mutually offset, and no force action is generated in the up-down moving direction of the high-pressure valve core 8. The pressure reducing valve structure ensures that the movable valve core is not influenced by the force generated by the upstream high-pressure gas, the outlet pressure is more stable, and meanwhile, the structure can improve the flow of the valve.

As shown in fig. 3, the first stage high pressure reducing valve is disposed below the valve seat 14 of the stop valve, the first stage high pressure reducing valve includes a high pressure valve seat 6, a high pressure valve core sleeve 7, a high pressure valve core 8 and a high pressure sealing head 10, the columnar high pressure valve seat 6 is disposed below the valve seat 14 of the stop valve, six slant holes 42 uniformly distributed in the circumferential direction are formed in the high pressure valve seat 6, a certain included angle is formed between the slant holes 42 and the axis of the high pressure valve seat 6, in the embodiment of the present invention, the included angle is 30 degrees, the cylindrical high pressure valve core sleeve 7 is disposed below the high pressure valve seat 6, two annular grooves are formed on the side wall surface of the high pressure valve core sleeve 7 contacting with the second channel 235, a twelfth sealing ring 37 is installed in the annular groove, a circular groove is formed at the top of one end of the high pressure valve core sleeve 7, the circular groove is communicated with the slant holes 42 of the high pressure valve seat 6, a cavity structure is formed in the middle of the high pressure valve core sleeve 7, install the high-pressure case 8 of bolt column structure in it, the shaft-like portion of high-pressure case 8 is opened and is had the twice annular, the annular in install eleventh sealing washer 36, the centre of high-pressure case 8 has the through-hole that runs through, the top of its through-hole is the infundibulate, the through-hole of its lower part is the echelonment, middle through-hole diameter is minimum, the head of high-pressure case 8 is opened has the annular, the annular in install thirteen sealing washers 38, the below of high-pressure case cover 7 is high-pressure head 10, high-pressure head 10 passes through the helicitic texture and is connected with the second passageway 235 of casing 23, inject high-pressure case cover 7 and high-pressure case 8 in the second passageway 235 between high-pressure head 10 of casing 23 and high-pressure valve seat 6.

The first bellying 231 of casing 23 is seted up with the blind hole, the blind hole in install the second level relief valve, as shown in fig. 4, the second level relief valve includes low pressure end cover 1, low pressure valve rod component 2, low pressure spring 3, low pressure valve barrel 4 and low pressure valve seat 5, the passing through threaded connection of blind hole in low pressure end cover 1 and the first bellying 231 of casing 23, the centre of low pressure end cover 1 is the echelonment through-hole, the lower part suit of low pressure end cover 1 is in the low pressure valve barrel 4 of tube-shape, the lower part of low pressure end cover 1 contacts with low pressure valve barrel 4 and opens the annular on it, the annular in install the sealing washer, be provided with the low pressure valve rod component 2 that the cross-section is the T type in the cavity between low pressure end cover 1's bottom and low pressure valve barrel 4, the head of low pressure valve rod component 2 contacts with low pressure valve barrel 4 and opens the annular on it, install the sealing washer in the annular, the shaft-like part suit of low pressure valve rod component 2 is in the inward protruding flange of low pressure valve barrel 4, open in the middle of low pressure valve rod component 2 has the through-hole, the shaft-like portion of low pressure valve rod component 2 contacts with 4 flanges of low pressure valve barrel and opens it there is the annular, the annular in install the sealing washer, still open on the shaft-like portion of low pressure valve rod component 2 rather than the perpendicular communicating through-hole of inside through-hole, open the lower part of the shaft-like portion of low pressure valve rod component 2 has the cross-section to be the cavity of T type, the cavity in be provided with rather than shape assorted end 43, open the bottom of low pressure valve barrel 4 has the circular slot, install low pressure disk seat 5 in the circular slot, it has the annular to open in the middle of the low pressure disk seat 5, open the bottom of low pressure disk seat 5 lateral wall and low pressure valve barrel 4 has the circular slot department of meeting to open on it, the annular in install the sealing washer.

The utility model discloses a stop valve is in first relief pressure valve upper reaches, the stop valve adopt antifriction off-load formula form, promptly, nut 11 and lock nut 12 pass through threaded connection, the screw thread part spraying modeling material, when bearing 35MPa operating pressure, still can easily open, close the operation.

As shown in fig. 1 and 4, the second protruding portion 232 of the housing 23 has a columnar structure with a blind hole therein, the blind hole is internally provided with an inlet filter 25, the inlet filter 25 is a metal sintered filter, and is used for cleaning gas during gas use, the outer side of the end portion of the second protruding portion 232 is provided with two ring grooves, the ring grooves are internally provided with a fifteenth sealing ring 40, and the third protruding portion 233 is used as a pressure sensor interface and is directly connected with the inside of the gas cylinder, so that the gas inside the gas cylinder can be monitored at any time.

The utility model has the characteristics as follows:

the utility model relates to a hydrogen fuel cell decompression combination valve is through carrying out structural optimization with each single function part, with each necessary single function valve height integration in the structure of a valve body for each single function valve is small and exquisite compact, through reasonable overall structure arrangement, with weight control within 215g, reduces by more than 25% compared with like product weight, the effectual time of endurance and the work load that improves unmanned aerial vehicle; the anti-wear unloading structure of the stop valve has the effect that required torque is reduced when the nut 11 (the nut 11 drives the valve rod 13 to move up and down) is screwed to open and close. First order relief pressure valve adopts full off-load formula structure for outlet pressure and the flow that the relief pressure valve can provide are bigger, satisfy unmanned aerial vehicle to the demand of more high-power hydrogen fuel cell pile development, with improvement duration and work load, TPRD's structural style, cartridge formula structrual installation is on the casing, this simple structure, but make full use of casing space, with the inside hollowing out of casing, alleviate whole weight. The pressure sensor and the gas cylinder are directly communicated, the interface of a relevant valve on the market is arranged at the downstream of the stop valve, the pressure sensor can monitor the internal pressure of the gas cylinder only after the stop valve is opened, and the structural channel is arranged at the upstream of the stop valve and is directly communicated with the inside of the gas cylinder to detect the internal pressure.

Claims

1. A hydrogen fuel cell pressure reducing combination valve is characterized in that: the temperature and pressure relief valve comprises a shell, wherein a one-way valve is arranged in the shell, the one-way valve is communicated with a temperature and pressure relief device, the one-way valve is communicated with a stop valve, the stop valve is connected with a pressure reducing valve, and the one-way valve, the temperature and pressure relief device, the stop valve and the pressure reducing valve are all arranged in the shell;

the shell is internally provided with a first channel, the first channel is internally provided with a one-way valve, the one-way valve comprises an inflation inlet, a one-way valve seat, a one-way valve core assembly and a one-way valve spring, the inflation inlet and the one-way valve seat are connected to one end of the first channel, through holes are formed in the inflation inlet and the one-way valve seat, the lower end surfaces of the inflation inlet and the one-way valve seat and the one-way valve core assembly form sealing, an inflation inlet plugging cover is connected to the inflation inlet and the one-way valve seat, an inflation inlet filter is arranged below the inflation inlet plugging cover, the one-way valve core assembly is arranged in the first channel of the shell at the lower part of the inflation inlet and the one-way valve seat, a plug is sleeved at one end, close to the inflation inlet and the one-way valve seat, of the one-way valve core assembly is internally provided with a blind hole, and the other end of the one-way valve core assembly is provided with a one-way valve spring;

2. A hydrogen fuel cell pressure reducing combination valve as defined in claim 1, wherein: the casing open and to have the second passageway, the one end of second passageway in install the stop valve, the stop valve including connecting the lock nut in the second passageway, install the nut in the lock nut, the nut is connected with the valve rod, the valve rod is shaft-like structure, the head of valve rod is the round platform form, the shaft-like portion of valve rod and the second passageway in close contact with of casing, form the space between the head of its round platform form and the passageway of casing, the below of valve rod is provided with the disk seat, the disk seat intermediate position has one and valve rod head matched with round hole.

3. A hydrogen fuel cell pressure reducing combination valve as defined in claim 1, wherein: the pressure reducing valve comprises a first-stage high-pressure reducing valve and a second-stage low-pressure reducing valve.

4. A hydrogen fuel cell pressure reducing combination valve as defined in claim 3, wherein: the first-stage high-pressure reducing valve comprises a high-pressure valve seat, a high-pressure valve core sleeve, a high-pressure valve core and a high-pressure end enclosure, wherein the high-pressure valve seat is arranged below a valve seat of the stop valve, an inclined hole is formed in the high-pressure valve seat, the high-pressure valve core sleeve is arranged below the high-pressure valve seat, a circular groove is formed in the top of one end of the high-pressure valve core sleeve and communicated with the inclined hole of the high-pressure valve seat, a cavity structure is arranged in the middle of the high-pressure valve core sleeve, the high-pressure valve core is arranged in the cavity structure, the high-pressure valve core is arranged below the high-pressure valve core sleeve, the high-pressure end enclosure is connected with a second channel, and the high-pressure valve core sleeve and the high-pressure valve core are limited in a second channel between the high-pressure end enclosure of the shell and the high-pressure valve seat.

5. A hydrogen fuel cell pressure reducing combination valve as defined in claim 3, wherein: the second-stage pressure reducing valve comprises a low-pressure end cover, a low-pressure valve rod assembly, a low-pressure spring, a low-pressure valve sleeve and a low-pressure valve seat, wherein the low-pressure end cover is connected with a blind hole in a first boss of the shell, a through hole is formed in the middle of the low-pressure end cover, the lower portion of the low-pressure end cover is sleeved in the low-pressure valve sleeve, the low-pressure valve rod assembly is arranged in a cavity between the bottom of the low-pressure end cover and the low-pressure valve sleeve, a rod-shaped portion of the low-pressure valve rod assembly is sleeved in an inward protruding flange of the low-pressure valve sleeve, a through hole is formed in the middle of the low-pressure valve rod assembly, a through hole vertically communicated with the through hole in the rod-shaped portion of the low-pressure valve rod assembly is formed in the rod-shaped portion of the low-pressure valve rod assembly, an end matched with the shape of the cavity is arranged in the cavity, a circular groove is formed in the bottom of the low-pressure valve sleeve, the low-pressure valve seat is arranged in the circular groove, and a step-shaped through hole is formed in the middle of the low-pressure valve seat.

6. A hydrogen fuel cell pressure reducing combination valve as defined in claim 1, wherein: the shell is provided with a first protruding part and a second protruding part, and a third protruding part is arranged on one side surface of the shell between the first protruding part and the second protruding part.

7. A hydrogen fuel cell pressure reducing combination valve as defined in claim 6, wherein: the second bulge is internally provided with a blind hole, and an inlet filter is arranged in the blind hole.

8. A hydrogen fuel cell pressure reducing combination valve as defined in claim 6, wherein: and the third bulge is used as a pressure sensor interface and is directly connected with the inside of the gas cylinder.