CN114060720A

CN114060720A - Combination valve for hydrogen supply system of unmanned aerial vehicle

Info

Publication number: CN114060720A
Application number: CN202010759030.6A
Authority: CN
Inventors: 刘彦杰; 何湘; 孙吉党
Original assignee: Rugao Hanhydrogen New Energy Technology Co ltd
Current assignee: Rugao Hanhydrogen New Energy Technology Co ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2022-02-18

Abstract

The invention discloses a combination valve for an unmanned aerial vehicle hydrogen supply system, which comprises: the valve body is communicated with the high-pressure gas cylinder and is provided with a gas charging port and a gas outlet, and the gas outlet is communicated with the downstream electric pile of the hydrogen fuel cell unmanned aerial vehicle; a pressure relief system disposed within the valve body, a one-way valve disposed within the valve body at the inflation port; a stop valve communicated with a fluid passage between the high-pressure gas cylinder and the inlet of the pressure reducing system; the pressure relief device and the pressure sensor are communicated with the high-pressure gas cylinder; the pressure reducing system adopts a two-stage pressure reducing mode, and the one-way valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve and the pressure relief device are approximately arranged in the same plane. The invention integrates the stop valve, the two-stage pressure reducing valve, the one-way valve and the glass bead TPRD into a whole, and through the combined design of all components, the layout in the valve body is compact and reasonable, and meanwhile, the product has light weight, convenient installation, reliable sealing, long service life and stable outlet pressure.

Description

Combination valve for hydrogen supply system of unmanned aerial vehicle

Technical Field

The invention relates to a valve, in particular to a combined valve suitable for a hydrogen supply system of a hydrogen fuel cell unmanned aerial vehicle.

Background

The appearance of the unmanned aerial vehicle provides a lot of convenience for the life of people, and the unmanned aerial vehicle is widely applied to various industries of the society, but the problem that researchers are very painful due to the too short endurance time of the unmanned aerial vehicle is always solved.

Traditional unmanned aerial vehicle adopts the lithium cell as the power supply mostly, but the continuation of the journey only can maintain about 20 minutes, and needs often to dismantle, change the battery, very consuming time hard. In order to solve the problem, researchers explore two brand-new power sources, so that the efficiency of the unmanned aerial vehicle can be greatly improved; firstly, use hydrogen fuel cell to replace the lithium cell, can support unmanned aerial vehicle continuous operation, secondly use laser emitter to supply power for unmanned aerial vehicle, the laser beam from ground transmission is changed into power by the receiver on the fuselage, can support unmanned aerial vehicle to work always almost.

In the technical field of unmanned aerial vehicles, the hydrogen fuel cell unmanned aerial vehicle is not only green and environment-friendly, but also has sufficient fuel supply, can realize all-weather flight, further makes large-scale popularization and use possible, the cylinder valve used for connecting the high-pressure gas cylinder and the hydrogen fuel cell in the hydrogen fuel cell unmanned aerial vehicle is a key part, the stability of supplying hydrogen to the hydrogen fuel cell is directly influenced by the quality of the cylinder valve, the use efficiency of the hydrogen in the high-pressure gas cylinder and the working safety of the unmanned aerial vehicle are related, the cylinder valve in the existing hydrogen fuel cell unmanned aerial vehicle is not high in integration level and large in size, is not beneficial to the flight of the unmanned aerial vehicle, also the performance is relatively poor in the aspect of the stability control to hydrogen, and the flow supply of hydrogen is not good, and the hydrogen utilization ratio is not high, and unstable hydrogen supply also can produce certain potential safety hazard to unmanned aerial vehicle's work, and the cylinder valve that adopts at present can not satisfy fuel cell unmanned aerial vehicle's needs far away.

Disclosure of Invention

The invention mainly aims to solve the problems of low integration level, large volume, unstable hydrogen supply, potential safety hazard and the like of the cylinder valve for the existing hydrogen fuel cell unmanned aerial vehicle.

In order to achieve the purpose of the invention, the invention provides a combination valve for a hydrogen supply system of an unmanned aerial vehicle, which comprises:

the valve body is communicated with the high-pressure gas cylinder and is provided with a gas charging port and a gas outlet, and the gas outlet is communicated with the downstream electric pile of the hydrogen fuel cell unmanned aerial vehicle;

a pressure relief system disposed within the valve body, a one-way valve disposed within the valve body at the inflation port;

a stop valve communicated with a fluid passage between the high-pressure gas cylinder and the inlet of the pressure reducing system; the pressure reducing system, the one-way valve and the stop valve are approximately in the same plane.

As a further improvement, the pressure reducing system, the one-way valve and the stop valve are arranged in a way of being approximately surrounded in the same plane.

As a further improvement, the pressure reducing system adopts a two-stage pressure reducing system, and comprises a first pressure reducing valve and a second pressure reducing valve which are sequentially arranged along the direction from the inflation inlet to the air outlet, the outlet of the second pressure reducing valve is communicated to the air outlet, the hydrogen output is more stable through two-stage pressure reduction, the pressure reducing form of the two-stage pressure reducing valves can be adjusted according to requirements, the hydrogen outlet pressure is adjusted through two-stage pressure reduction, and the direct impact on the galvanic pile is avoided. Because the multistage pressure reduction is adopted, the pressure reduction capacity of the system is more stable, the pressure regulation is more reliable, even if the pressure of an air source is lower, the stable output can be still ensured, and the output in the full flow range is stable.

As a further improvement, the filter is arranged at the air inflation opening and/or the inlet of the first pressure reducing valve, so that impurities can be effectively filtered, and the anti-pollution capacity of the system is stronger.

As a further improvement, the combination valve further includes a pressure relief device communicated with the high-pressure gas cylinder, as a preferred embodiment, the pressure relief device is a temperature-sensing pressure relief device, such as a glass bead TPRD, once the gas pressure in the high-pressure gas cylinder exceeds a rated pressure, the high-pressure gas in the high-pressure gas cylinder breaks through the glass bead to communicate with the outside of the valve body, so as to perform pressure relief to prevent explosion of the high-pressure gas cylinder.

As a further improvement, the stop valve is provided with a stop valve handle exposed outside the valve body, and the stop valve handle is rotated to control the on-off of the hydrogen supply fluid channel.

As a further improvement, the valve body is embedded with a high-pressure sensor interface and a high-pressure inflation interface, the high-pressure sensor interface can be directly connected with a pressure sensor, and the high-pressure inflation interface is arranged at the inflation port.

As a further improvement, the check valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve and the pressure relief device are arranged in the same plane, preferably, the check valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve and the pressure relief device are uniformly arranged in a surrounding manner at a certain angle.

As a further improvement, the axes of the check valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve and the pressure relief device are arranged in the same plane.

As a further improvement, the axes of the check valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve and the pressure relief device are respectively arranged in the same plane in an intersecting manner.

The invention integrates the stop valve, the two-stage pressure reducing valve, the one-way valve and the glass bead TPRD into a whole, and through the combined design of all components, the layout in the valve body is compact and reasonable, and meanwhile, the product has light weight, convenient installation, reliable sealing, long service life and stable outlet pressure.

Drawings

In order that the contents of the invention may be more readily understood, further illustrative descriptions of the invention are provided below with reference to the accompanying drawings and examples.

Fig. 1 is a schematic structural diagram according to an embodiment of the present invention.

Fig. 2 is a top view structural diagram of an embodiment of the present invention.

FIG. 3 is a schematic view of an embodiment of the section A-A in FIG. 1.

FIG. 4 is a schematic view of an embodiment of a section B-B in FIG. 1.

In the figure: 1-valve body, 10-charging port, 11-air outlet, 2-one-way valve, 21-one-way valve block cover, 22-one-way valve seat, 23-one-way valve sealing element, 24-one-way valve spring, 25-one-way valve core, 3-stop valve, 31-stop valve seat, 32-stop valve rod, 33-stop valve adapter, 34-stop valve screw, 35-stop valve handle, 4-first pressure reducing valve, 41-first valve seat, 42-first spring, 43-first valve core component, 44-first valve adapter, 45-first top cover, 46-first end cover, 5-second pressure reducing valve, 51-second valve seat, 52-second valve sleeve, 53-second valve core component, 54-second spring, 55-second-stage end cover, 6-glass bead TPRD, 61-TPRD end cap, 62-glass bulb, 63-TPRD valve core, 64-disc spring, 7-pressure sensor, 70-high pressure sensor interface and 8-filter.

Detailed Description

The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The combined valve is used as a key component used in a hydrogen supply system of the hydrogen fuel cell unmanned aerial vehicle, is arranged at the outlet of a high-pressure gas cylinder, and is used for reducing the pressure of high-pressure hydrogen in the gas cylinder and providing stable low-pressure for a downstream galvanic pile.

It should be noted that the unmanned aerial vehicle pursues lightweight in design, requires a small volume, and thus can meet flight requirements of various rows, the existing high-pressure cylinder valve has a large volume or occupied space dimension, is poor in adaptability with the unmanned aerial vehicle, has insufficient safety performance and hydrogen supply stability, and can not meet technical requirements of the hydrogen combustion battery unmanned aerial vehicle far.

In the field of valve technology, a plurality of cavities for mounting each component are generally integrally formed in a valve body, the cavities are communicated through a fluid channel, each component is correspondingly and limitedly mounted on different cavities in the valve body, the components may be disposed inside the valve body, or may be partially disposed inside the valve body, and a portion of the component is exposed outside the valve body, but all of the components may be considered to be connected inside the valve body.

As shown in fig. 1-4, a combination valve for a hydrogen supply system of an unmanned aerial vehicle comprises: the valve body 1 is communicated with a high-pressure gas cylinder and is provided with a gas charging port 10 and a gas outlet 11, and the gas outlet 11 is communicated with a downstream electric pile of the hydrogen fuel cell unmanned aerial vehicle;

the pressure reducing system and the one-way valve 2 are arranged in the valve body 1, and the one-way valve 2 is arranged in the valve body 1 at the inflating port 10;

a stop valve 3 communicated with a fluid passage between the high-pressure gas cylinder and the inlet of the pressure reducing system;

the pressure reducing system, the one-way valve 2 and the stop valve 3 are approximately in the same plane.

As a further improvement, the pressure reducing system, the check valve 2 and the stop valve 3 are arranged substantially around the same plane.

As a further improvement, a connector communicated with the inflation inlet is vertically arranged on one end face of the valve body 1, the connector is connected to the high-pressure gas cylinder to communicate the high-pressure gas cylinder with a fluid channel in the valve body, an O-shaped ring is embedded in a groove on the connector to ensure the connection airtightness with the high-pressure gas cylinder, and the position of the connector can be changed according to the design requirement of the fluid channel, such as the central position of the end face of the valve body.

As a further improvement, the pressure reducing system adopts a two-stage pressure reducing system, and comprises a first pressure reducing valve 4 and a second pressure reducing valve 5 which are sequentially arranged from an inflation inlet 10 to an air outlet 11, an outlet of the second pressure reducing valve 5 is communicated to the air outlet 11, hydrogen output is more stable through two-stage pressure reduction, the pressure reducing form of the two-stage pressure reducing valves can be adjusted according to requirements, hydrogen outlet pressure is adjusted through two-stage pressure reduction, and direct impact on a galvanic pile is avoided. Because the multistage pressure reduction is adopted, the pressure reduction capacity of the system is more stable, the pressure regulation is more reliable, even if the pressure of an air source is lower, the stable output can be still ensured, and the output in the full flow range is stable.

The first-stage pressure reducing valve 4 comprises a first-stage valve seat 41, a first-stage spring 42, a first-stage valve adaptor 44 and a first-stage end cover 46 which are sequentially arranged along the axis of the first-stage pressure reducing valve, the front end of the first-stage valve adaptor 44 abuts against the first-stage spring 42, the rear end of the first-stage valve adaptor 44 is connected with a first-stage top cover 45, a first-stage valve core assembly 43 is sleeved outside the first-stage spring 42, the first-stage valve adaptor 44 and the first-stage top cover 45, and the first-stage end cover 46 is connected to the end of the first-stage valve core assembly 43.

The second-stage pressure reducing valve 5 comprises a second-stage valve seat 51, a second-stage valve sleeve 52, a second-stage valve core assembly 53 and a second-stage end cover 55 which are sequentially arranged along the axis of the second-stage pressure reducing valve, a second-stage spring 54 is arranged outside the second-stage valve sleeve 52, the outlet of the second-stage pressure reducing valve is communicated to the air outlet, and the second-stage pressure reducing valve 5 adjusts the pressure of the discharged hydrogen again, so that the pressure of the outlet hydrogen is stable, the direct impact on the hydrogen fuel cell is avoided, and the service life of the cell is favorably ensured.

As an embodiment, the two-stage pressure reducing valve structure may adopt an existing conventional structure for reducing the pressure of hydrogen in the hydrogen cylinder twice, in some embodiments, the pressure reducing structures of the two-stage pressure reducing valves may be the same, and the pressure reducing modes of the two-stage pressure reducing valves may also be different.

As a further improvement, the filter 8 is arranged at the position of the inflation inlet 10 or the inlet of the first pressure reducing valve 4, so that impurities can be effectively filtered, and the anti-pollution capacity of the system is stronger.

As a further improvement, the combination valve further comprises a pressure relief device connected to the valve body and communicated with the fluid passage in the valve body, the pressure relief device is used for preventing accidents caused by overhigh temperature or pressure in the high-pressure gas cylinder, and the pressure relief device is communicated to the high-pressure gas cylinder through an independent fluid passage; in some embodiments, the pressure relief device is a temperature-sensing pressure relief device, such as a glass bead TPRD, and once the gas pressure in the high-pressure gas cylinder exceeds the rated pressure, the high-pressure gas in the high-pressure gas cylinder breaks through the glass bead to communicate with the outside of the valve body, so as to perform pressure relief to prevent explosion of the high-pressure gas cylinder.

The glass bead TPRD6 comprises a TPRD valve core 63, a glass bulb 62 and a TPRD end cap 61 which are sequentially arranged along the axis, the tail end of the glass bulb 62 abuts against a groove on the TPRD end cap 61, the tail end of the glass bulb 62 abuts against a groove on the TPRD valve core 63 communicated with a fluid channel, the fluid channel in the valve body 1 is blocked by the glass bulb 62 from the outside of the valve body, and a disc spring 64 is pre-tensioned in the TPRD valve core 63 and the valve body 1, so that the glass bulb 62 is tensioned in a cavity of the glass bead TPRD 6.

When the pressure of gas in the high-pressure gas cylinder exceeds the rated pressure and the temperature in the gas cylinder rises, liquid in the glass bubble 62 is heated and expanded, when the temperature in the gas cylinder rises to the bearing temperature range of the glass bubble, the outer layer glass of the glass bubble 62 is burst, the TPRD valve core 63 loses the supporting force of the glass bubble 62 to the TPRD valve core, and simultaneously moves towards the TPRD end cap 61 under the action of the disc spring 64, so that a fluid channel in the valve body is communicated with the outside.

As a further improvement, the stop valve 3 has a stop valve handle 5 exposed outside the valve body 1, and the on-off of the hydrogen supply fluid passage is controlled by rotating the stop valve handle 35.

As a further improvement, the stop valve 3 comprises a stop valve seat 31, a stop valve rod 32, a stop valve adapter 33 and a stop valve handle 35 which are sequentially arranged along the axis thereof, the end of the stop valve adapter 33 is limited in a groove on the stop valve handle 35, one end of the stop valve rod 32 is connected with a stop valve screw 34 on the stop valve handle 35, a stop valve antifriction gasket (not shown) is arranged between the stop valve screw 32 and the stop valve screw 34, the other end of the stop valve rod 32 passes through the stop valve adapter 33 and abuts against a notch in the stop valve seat 31, which is communicated with a fluid channel, and a plug at the front end of the stop valve rod 32 is adapted to the groove on the stop valve seat 31, so that the opening and closing of the fluid channel between the high-pressure gas cylinder and a pressure reduction system can be controlled; in some embodiments, the stop valve stem 32 may also be directly attached or screwed to the stop valve handle 35.

The invention adopts the unloading type manual stop valve, the screwing torque of the stop valve is smaller under the high-pressure condition, and the control of the stop valve is more labor-saving.

When the high-pressure gas cylinder is charged, the stop valve rod 32 abuts against the stop valve seat 31 by rotating the stop valve handle 35, and the fluid passage is closed; when the high-pressure gas cylinder is used for gas transmission of the hydrogen fuel cell, the stop valve handle 35 is rotated to enable the stop valve rod 32 to be far away from the stop valve seat 31 until a fluid channel between the stop valve 3 and the inlet of the first-stage pressure reducing valve 4 is communicated, and the stop valve is in a normally open state during gas transmission.

In an embodiment, when a high-pressure gas cylinder is used for gas transmission of a hydrogen fuel cell, hydrogen sequentially flows through a stop valve 3, a first pressure reducing valve 4 and a second pressure reducing valve 5 and then is communicated to a hydrogen fuel cell stack through a hydrogen outlet, a pressure sensor 7 monitors the residual amount of the hydrogen in the high-pressure gas cylinder in real time, and the glass beads TPRD6 guarantee the safety of the high-pressure gas cylinder in real time.

As a further improvement, the check valve 2 comprises a check valve seat 22, a check valve spool 25 and a check valve spring 24 which are arranged in sequence along the axial direction of the check valve 2 along the fluid flowing direction, a check valve sealing member 23 is abutted between the check valve seat 22 and the check valve spring 24, and a check ring at the tail part of the check valve spool 25 is abutted against a flange of the check valve sealing member 23 to limit the position; in some embodiments, a check valve plug 21 is connected to the end of the check valve seat 22.

In some embodiments, a high-pressure inflation interface is arranged at the inflation port of the valve body, and the high-pressure inflation interface can be directly communicated with a gas source to perform inflation operation.

When the high-pressure gas cylinder is inflated, high-pressure gas flows through the one-way valve seat 22 and pushes the one-way valve sealing piece 23 to move towards the one-way valve spring 24 until the high-pressure hydrogen is communicated with a fluid channel in the valve body, and the high-pressure hydrogen flows through the one-way valve 2 and then enters the high-pressure gas cylinder.

As a further improvement, a filter is further arranged between the one-way valve 2 and the inflation inlet, preferably, the filter is arranged in a valve body at the inflation inlet to filter hydrogen entering the high-pressure gas cylinder for the first time, and the precision of the filter can be replaced according to requirements.

As a further improvement, the valve body 1 is embedded with a high-pressure sensor interface and a high-pressure inflation interface, the high-pressure sensor interface 70 can be directly connected with the pressure sensor 7, the hydrogen allowance of the high-pressure gas cylinder can be monitored through the pressure sensor 7, and the high-pressure inflation interface is arranged at the inflation port.

As a further improvement, the pressure sensor 7 is disposed or communicated between the high-pressure gas cylinder and the inlet of the first pressure reducing valve 4, and in some embodiments, the pressure sensor 7 may be disposed on a fluid passage before or after the shutoff valve 3.

As a further improvement, the check valve 2, the shutoff valve 3, the first pressure reducing valve 4, and the second pressure reducing valve 5 are arranged substantially in the same plane.

As a further improvement, the axes of the pressure reducing system and the stop valve 53 are in the same plane, and the axes of the check valve 2, the pressure sensor 7 and the glass bead TPRD6 are in the same plane.

As a further improvement, the check valve 2, the stop valve 3, the first pressure reducing valve 4, the second pressure reducing valve 5 and the pressure relief device 6 are arranged substantially in the same plane, and preferably, the axes of the check valve 2, the stop valve 3, the first pressure reducing valve 4, the second pressure reducing valve 5 and the pressure relief device 6 are arranged substantially in the same plane.

As a preferable improvement, the check valve 2, the stop valve 3, the first pressure reducing valve 4, the second pressure reducing valve 5 and the pressure relief device 6 are uniformly arranged around at an angle.

The axes of the check valve 2, the stop valve 3, the first pressure reducing valve 4, the second pressure reducing valve 5 and the pressure relief device 6 are respectively intersected in the same plane and are positioned in the valve body.

By way of example, adjacent components in the valve body are arranged in a staggered mode, namely axes of the components arranged at intervals are in the same plane, for example, axes of the pressure reducing system, the one-way valve and the stop valve are in the same plane, and the pressure sensor and the pressure relief device are in the same plane.

The axes of the partial components in the valve body can be combined according to the requirement to enable some components to be in the same plane, and the axes of the rest components are in the other plane, but for the requirement of installation and space combination, the components in the valve body can be slightly staggered up and down in arrangement, and only the components are approximately in the same plane, and all the components can be in the same plane and the axes of the components are also in the same plane.

In specific implementation, the valve body may be shaped like a triangle, and the check valve 2, the first pressure reducing valve 4, the pressure relief device 6, the second pressure reducing valve 5, the pressure sensor 7, and the stop valve 3 may be sequentially disposed at the vertex and each side of the triangle, and in some embodiments, the triangle is an equilateral triangle.

In other embodiments, the shape of the valve body can also be circular, elliptical, pentagonal, hexagonal, etc., as desired.

As a further improvement, sealing rings are selectively arranged between various valves or assemblies communicated in the valve body and the valve body, so that the air tightness of the valve body is ensured, and the leakage of hydrogen is prevented; meanwhile, as an optional embodiment, the end parts of the components communicated in the valve body can be installed outside the valve body and controlled, for example, the front parts of the first pressure reducing valve, the second pressure reducing valve, the pressure relief device and the one-way valve are arranged in the cavity corresponding to the valve body, and the rear end parts are at least exposed outside the valve body, so that the design is favorable for assembling and maintaining the components of the combined valve, and the arrangement mode between the components and the valve body can be changed according to needs.

In order to meet the rigorous lightweight performance requirement and high-reliability use requirement of a hydrogen supply system, the high-quality and high-performance light aluminum alloy valve body material is adopted, the pressure reducing system, the stop valve, the glass bead TPRD and other valves are highly integrated in the valve body, and the components of the valve body are integrally distributed on a plane, so that the space volume occupied by the combined valve in the vertical direction is greatly reduced, the valve body is thinner and more compact, and the requirement of the hydrogen supply system of an unmanned aerial vehicle can be met.

The invention adopts a two-stage pressure reducing system, and the pressure reducing valve can provide stable pressure supply for the downstream galvanic pile within the inlet pressure range of 0.5-40MPa, thereby prolonging the endurance time of the unmanned aerial vehicle to the maximum extent and ensuring that the hydrogen utilization rate of the gas cylinder can reach 98.75%.

The components in the valve body of the invention are generally in the same plane and arranged in a surrounding mode, so that the volume of the valve body is greatly reduced, such as that the geometric dimension of a combined valve of one embodiment is 120X 90X 62 (mm).

It is obvious to those skilled in the art that various combinations can be implemented on the basis of the above embodiments to obtain different technical solutions, for example, in some embodiments, only the stop valve, the pressure reducing system and the pressure relief device are arranged in the valve body, in this case, a manual stop valve may be arranged at the inflation opening, and in other embodiments, the pressure relief device may also adopt a safety valve. Embodiments obtained by combining the above-described embodiments also belong to the scope of protection of the present invention without departing from the inventive concept.

It is to be understood that the scope of the present invention is not to be limited to the non-limiting embodiments, which are illustrated as examples only. The essential protection sought herein is further defined in the scope provided by the independent claims, as well as in the claims dependent thereon.

Claims

1. A combination valve for an unmanned aerial vehicle hydrogen supply system, comprising: the valve body is communicated with the high-pressure gas cylinder and is provided with a gas charging port and a gas outlet, and the gas outlet is communicated with the downstream electric pile of the hydrogen fuel cell unmanned aerial vehicle;

a pressure relief system disposed within the valve body, a one-way valve disposed within the valve body at the inflation port; characterized in that, the combination valve still includes:

a stop valve communicated with a fluid passage between the high-pressure gas cylinder and the inlet of the pressure reducing system;

the pressure reducing system, the one-way valve and the stop valve are approximately in the same plane.

2. The combination valve of claim 1, wherein the axes of the pressure reducing system, the one-way valve and the stop valve are substantially in the same plane.

3. The combination valve of claim 1, wherein the pressure reducing system comprises a first pressure reducing valve and a second pressure reducing valve arranged in sequence from the inflation inlet to the air outlet.

4. The combination valve for the hydrogen supply system of the unmanned aerial vehicle as claimed in claim 3, wherein the first pressure reducing valve comprises a first-stage valve seat, a first-stage spring, a first-stage valve adaptor and a first-stage end cover which are sequentially arranged along the axis of the first-stage pressure reducing valve, the front end of the first-stage valve adaptor abuts against the first-stage spring, the rear end of the first-stage valve adaptor is connected with a first-stage top cover, and a first-stage valve core assembly is sleeved outside the first-stage spring, the first-stage valve adaptor and the first-stage top cover; and

the second-stage pressure reducing valve comprises a second-stage valve seat, a second-stage valve sleeve, a second-stage valve core assembly and a second-stage end cover which are sequentially arranged along the axis of the second-stage pressure reducing valve, and a second-stage spring is arranged outside the second-stage valve sleeve.

5. The combination valve of claim 1, wherein the stop valve comprises a stop valve seat, a stop valve stem, a stop valve adapter, and a stop valve handle, which are sequentially arranged along an axis of the stop valve, wherein an end of the stop valve adapter is limited in a groove on the stop valve handle, one end of the stop valve stem is connected with a stop valve screw on the stop valve handle, and the other end of the stop valve stem passes through the stop valve adapter and abuts against a notch in the stop valve seat, which is communicated with the fluid passage.

6. The combination valve of claim 3, further comprising a pressure relief device connected to the valve body and in communication with the high pressure cylinder.

7. The combination valve of claim 6, wherein the pressure relief device is made of glass beads TPRD, the glass beads TPRD include a TPRD valve core, a glass bulb and a TPRD end cap sequentially arranged along an axis of the TPRD valve core, a tail end of the glass bulb abuts against a groove on the TPRD end cap, a tail end of the glass bulb abuts against a groove on the TPRD valve core, the groove is communicated with the fluid channel, the glass bulb blocks the fluid channel in the valve body from the outside of the valve body, and a disc spring is pre-tensioned in the TPRD valve core and the valve body.

8. The combination valve of claim 6, wherein the check valve, the stop valve, the first pressure reducing valve, the second pressure reducing valve, and the pressure relief device are arranged substantially in the same plane.

9. The combination valve of any one of claims 1 to 8, wherein the valve body is connected to a pressure sensor communicating with a fluid passage in the valve body.

10. The combination valve of claim 9, wherein a filter is disposed at the inlet of the pressure reduction system and/or a filter is disposed in the valve body at the inflation port.