Hydrogen Recycling System for Fuel Cell Stack of UAV and Its Control Method

Abstract

The present invention provides a hydrogen circulation system for a fuel cell stack of an unmanned aerial vehicle and a control method thereof. The system includes: a fuel cell stack; a compression chamber with both end faces open, one end face forming an input end of the compression chamber and the other end face forming an output end of the compression chamber; a drain port on the compression chamber, disposed near a one-way double-layer air intake device; when water in the compression chamber flows out through the drain port, there is no contact between the push rod and the one-way double-layer air intake device; a push rod that extends into the compression chamber through the input end of the compression chamber and fits with the inner wall of the compression chamber; a one-way double-layer air intake device; when water in the compression chamber flows into the drainage device, the one-way double-layer air intake device is opened under the thrust of the push rod to supply compressed hydrogen into the transition supercharging storage cylinder; a transition supercharging storage cylinder, whose output end is sequentially connected to a one-way intake valve, a three-way valve, and an intake port of the fuel cell stack; and a hydrogen source. The present invention integrates the functions of hydrogen circulation, hydrogen supercharging, and hydrogen humidification.

Description

Technical Field

[0001] The present invention belongs to the technical field of fuel cell stacks, and particularly relates to a hydrogen circulation system for a fuel cell stack used in an unmanned aerial vehicle and a control method thereof. Background Art

[0002] Developing hydrogen circulation technology for fuel cells used in unmanned aerial vehicles can not only increase the endurance of the unmanned aerial vehicle, but also respond to the policy of energy conservation and emission reduction.

[0003] The existing technology still has the following defects: 1. Currently, fuel cells use hydrogen to carry water out of the hydrogen stack, which will cause a large amount of tail gas to be generated. Most of these tail gases are discharged into the atmosphere, which is likely to cause waste of energy. If the tail gas is to be recovered, a large amount of water in the tail gas needs to be removed, and the existing methods have a high cost and are difficult to be applied in the industry. The hydrogen circulation pump is too heavy and not suitable for being assembled on an unmanned aerial vehicle, and the parasitic power generated is relatively large, which is not conducive to endurance. 2. To improve the efficiency of the fuel cell stack, it is often necessary to add an appropriate amount of moisture to the hydrogen for humidification, and a humidifying device is usually adopted, but this will increase the cost and system complexity. 3. In the mainstream tail gas recovery scheme, in order to meet the requirement of the fuel cell stack for hydrogen pressure, the recovered hydrogen needs to pass through a hydrogen compression device before it can be mixed with the hydrogen released from the hydrogen source or introduced into the fuel cell stack. However, the hydrogen compression device has disadvantages such as increasing the total cost of the equipment, increasing the complexity of the system, and increasing the total weight of the equipment, and is not suitable for being assembled on an unmanned aerial vehicle.

[0004] Therefore, how to achieve the organic unity of hydrogen circulation, hydrogen pressurization, and hydrogen humidification is one of the relatively key research directions at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydrogen circulation system for a fuel cell stack used in an unmanned aerial vehicle and a control method thereof, which integrate the functions of hydrogen circulation, hydrogen pressurization, and hydrogen humidification. To achieve the above purpose, the technical solution adopted is as follows:

[0006] A hydrogen circulation system for a fuel cell stack used in an unmanned aerial vehicle includes:

[0007] A fuel cell stack 10, whose exhaust port is connected to the input port on a compression chamber 30 through an intake electromagnetic valve 130, and whose intake port receives hydrogen;

[0008] The compression chamber 30 has both end faces open, one end face forms the input end of the compression chamber 30, and the other end face forms the output end of the compression chamber 30;

[0009] The drain port on the compression chamber 30 is arranged close to a one-way double-layer intake device 90; when the water in the compression chamber 30 flows out through the drain port, the push rod 35 does not contact the one-way double-layer intake device 90; wherein, the drain port is sequentially connected to a water inlet electromagnetic valve 110 and a drainage device 120;

[0010] The push rod 35 extends into the compression chamber 30 through the input end of the compression chamber 30 and fits against the inner wall of the compression chamber 30;

[0011] The one-way double-layer air intake device 90 is fixed to the output end of the compression chamber 30. When it is closed, it can seal the output end of the compression chamber 30, and when it is opened, it connects the output end of the compression chamber 30 and the input end of the transition supercharging gas storage cylinder 80;

[0012] When the water in the compression chamber 30 flows into the drainage device 120, the one-way double-layer air intake device 90 is opened under the thrust of the push rod 35 to supply the compressed hydrogen into the transition supercharging gas storage cylinder 80;

[0013] The output end of the transition supercharging gas storage cylinder 80 is sequentially connected to the one-way intake valve 70, the three-way valve 60, and the intake port of the fuel cell stack 10;

[0014] And the hydrogen source 50, whose output end is connected to the three-way valve 60.

[0015] Preferably, the one-way double-layer air intake device 90 includes:

[0016] A pipe 901, one end of which is fixed to the output end of the compression chamber 30, and the other end is connected to the transition supercharging gas storage cylinder 80 through a connecting pipe;

[0017] And the first layer and the second layer, which are distributed along the axial direction of the pipe 901; the first layer is arranged close to the compression chamber 30, and the second layer is arranged close to the transition supercharging gas storage cylinder 80;

[0018] The first layer includes a plurality of rigid sheets distributed along the circumferential direction of the pipe 901, and adjacent rigid sheets are in contact with each other to close the one-way double-layer air intake device 90;

[0019] The large end of the rigid sheet is fixed to the inner wall of the pipe, and its small end protrudes towards the second layer. The adjacent small ends are in contact with each other to prevent the hydrogen in the transition supercharging gas storage cylinder 80 from flowing back into the compression chamber 30;

[0020] The second layer is used to seal the pipe 901 and includes a plurality of flexible sheets distributed along the circumferential direction of the pipe 901, and adjacent flexible sheets are in contact with each other;

[0021] The large end of the flexible sheet is fixed to the inner wall of the pipe 901, and its small end protrudes towards the transition supercharging gas storage cylinder 80; adjacent flexible sheets are in contact with each other to seal the pipe 901.

[0022] Preferably, the rigid sheet and the flexible sheet have the same structure; the flexible sheet is rotated 60° clockwise relative to the corresponding rigid sheet

[0023] Preferably, one end of the push rod 35 facing the unidirectional double-layer intake device 90 is a cone, and the cone contacts the center of the first layer to open the first layer.

[0024] A method for controlling hydrogen circulation in a fuel cell stack for an unmanned aerial vehicle, comprising the following steps:

[0025] Step 1: The hydrogen-water mixture sequentially enters the compression chamber 30 through the exhaust port of the fuel cell stack 10 and the intake solenoid valve 130. As the mixture continuously enters, the internal pressure of the compression chamber 30 continuously increases;

[0026] When the pressure reaches the preset value, the intake solenoid valve 130 closes, and the push rod 35 in the compression chamber 30 starts to move towards the intake end of the transition supercharging gas storage cylinder 80 to compress the hydrogen in the compression chamber 30;

[0027] During the compression process, the air pressure in the compression chamber 30 increases, and the water vapor adheres to the inner wall of the compression chamber 30 due to gravity, increased pressure, and the compressed space, and continuously converges in front of the push rod 35 as the push rod 35 advances, forming liquid water;

[0028] Step 2: The water inlet solenoid valve 110 is opened, and the water in the compression chamber 30 flows into the drainage device 120;

[0029] Step 3: The push rod 35 sequentially pushes open the first layer and the second layer of the unidirectional double-layer intake device 90, and the compressed hydrogen and the remaining liquid water enter the transition supercharging gas storage cylinder 80;

[0030] Step 4: When the hydrogen pressure in the transition supercharging gas storage cylinder 80 reaches the value required for the one-way intake valve 70 to intake, the one-way intake valve 70 is conducted and intersects with the hydrogen released from the hydrogen source 50 through the subsequent three-way valve 60, and finally they are all introduced into the intake port of the fuel cell stack 10.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] 1. During the process of realizing hydrogen circulation, hydrogen supercharging and hydrogen humidification are realized.

[0033] Among them, hydrogen humidification means, on the one hand, having sufficient contact with water when being compressed in the compression chamber, and on the other hand, the loss of water in the transition supercharging gas storage cylinder 80. When the unmanned aerial vehicle flips and the fuselage vibrates during flight in the air, the water in the transition supercharging gas storage cylinder 80 will come into full contact with the hydrogen, thereby continuously humidifying the hydrogen.

[0034] 2. The cooperation between the push rod 35 and the unidirectional double-layer intake device 9 can solve the problem of unfavorable drainage caused by the attitude change of the unmanned aerial vehicle.

[0035] Unidirectional means that hydrogen cannot flow back into the compression chamber 30. The flaps of the soft layer (the second layer) of the unidirectional double-layer intake device fit tightly together because of their softness. At the same time, as the pressure in the transition supercharging gas cylinder 80 continuously increases, the soft layer is further squeezed.

[0036] The drainage is not affected by the attitude of the drone, which refers to the function of the push rod. The water acting is the water in the compression chamber. For example, the drone can perform complex movements such as climbing at a 90-degree elevation angle or flying straight for 90° clockwise rotation, and the duration is unknown. At this time, if there is no push rod and only the compression chamber, during this period, water will accumulate on one side of the compression chamber. When returning to the normal attitude, due to the limited water intake capacity of the drainage device, a large amount of water may be forced into the transition supercharging gas cylinder 80 (water can squeeze open the unidirectional double-layer intake device).

[0037] 3. The hydrogen processed by the compression chamber 30, the unidirectional double-layer intake device 90, and the transition supercharging gas cylinder 80 contains moisture, which can play a humidifying effect, improving the reaction efficiency and reducing the cost of the humidifier.

[0038] 4. The connecting device between the compression chamber 30 and the transition supercharging gas cylinder 80 is the unidirectional double-layer intake device 90. The second layer makes up for the softness of the material with higher strength, and the first layer reduces the possibility that the flaps will overly sink into the compression chamber due to the retraction of the push rod, improving the reliability of mechanical operation.

[0039] 5. The connecting device between the compression chamber 30 and the transition supercharging gas cylinder 80 is the unidirectional double-layer intake device 90, which achieves the opening and closing effect through the reciprocating movement of the push rod without generating parasitic power.

[0040] The design of the unidirectional double-layer intake device can be opened by the push rod, which further demonstrates the value of the push rod from the perspective of not generating parasitic power. In the prior art, solenoid valves are used, and solenoid valves will generate parasitic power.

[0041] The system supercharging is completed by using the compression chamber 30, the push rod 35, the unidirectional double-layer intake device 9, the unidirectional intake valve 70, and the transition supercharging gas cylinder 80, eliminating the compressor, thus not generating the additional cost of the compressor.

[0042] Specifically, relying on the cooperation of the compression chamber 30, the push rod 35, and the unidirectional double-layer intake device 9 can continuously pressurize the gas in the transition supercharging gas cylinder 80, while the unidirectional intake valve 70 and the transition supercharging gas cylinder 80 can ensure the final pressure when releasing hydrogen, so that after mixing with the hydrogen released from the hydrogen source, it can meet the pressure requirement of the fuel cell stack for the incoming hydrogen. (The unidirectional intake valve can set the pressure limit). Brief Description of the Drawings

[0043] Figure 1Schematic diagram of the hydrogen circulation system for a fuel cell stack used in a drone;

[0044] Figure 2 Example diagram of the circulation principle of the hydrogen circulation system for a fuel cell hydrogen stack used in a drone;

[0045] Figure 3 Flow chart of the hydrogen circulation control method for a fuel cell stack used in a drone;

[0046] Figure 4 Schematic diagram of a certain flexible sheet of the second layer in the one-way double-layer intake device.

[0047] Among them, 10 - fuel cell stack; 130 - intake solenoid valve;

[0048] 100 - pressurized storage device, 30 - compression chamber; 35 - push rod; 90 - one-way double-layer intake device, 901 - pipeline; 80 - transition pressurized storage cylinder;

[0049] 110 - water inlet solenoid valve; 120 - drainage device; 70 - one-way intake valve; 60 - three-way valve; 50 - hydrogen source. Specific implementation manner

[0050] The hydrogen circulation system for a fuel cell stack used in a drone and its control method of the present invention will be described in more detail below with reference to the schematic diagrams, in which the preferred embodiments of the present invention are shown. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as a broad guidance for those skilled in the art and not as a limitation to the present invention.

[0051] As Figures 1 - 2 , the hydrogen circulation system for a fuel cell stack used in a drone includes: a fuel cell stack 10, a pressurized storage device 100, a drainage device 120, and a hydrogen source 50.

[0052] The pressurized storage device 100 includes: a compression chamber 30, a push rod 35, a transition pressurized storage cylinder 80, and a one-way double-layer intake device 90.

[0053] The specific structure of the hydrogen circulation system for a fuel cell stack used in a drone is as follows:

[0054] The fuel cell stack 10, its exhaust port is connected to the input port on the compression chamber 30 through an intake solenoid valve 130, and its intake port receives hydrogen.

[0055] There is a pressure sensor on the connection channel between the intake electromagnetic valve 130 and the compression chamber 30. The pressure sensor sends the pressure signal to the controller. The controller receives the pressure signal transmitted by the pressure sensor, performs the logical operations stored internally in advance, and then outputs the corresponding control signals to control the intake electromagnetic valve 130, the push rod 35, and the water inlet electromagnetic valve 110.

[0056] When the intake electromagnetic valve 130 is opened, since the connection channel is connected to the compression chamber 30 through the input port on the compression chamber 30, the pressure on the connection channel is equal to the pressure in the compression chamber 30.

[0057] The compression chamber 30 has both end faces open. One end face forms the input end of the compression chamber 30, and the other end face forms the output end of the compression chamber 30.

[0058] The drain port on the compression chamber 30 is arranged close to the one-way double-layer intake device 90.

[0059] When the water in the compression chamber 30 flows out through the drain port, the push rod 35 does not contact the one-way double-layer intake device 90. Among them, the drain port is connected to the water inlet electromagnetic valve 110 and the drainage device 120 in sequence.

[0060] The push rod 35 extends into the compression chamber 30 through the input end of the compression chamber 30 and fits against the inner wall of the compression chamber 30.

[0061] One end of the push rod 35 facing the one-way double-layer intake device 90 protrudes to open the one-way double-layer intake device 90. Specifically, the push rod 35 can be an electric push rod.

[0062] The one-way double-layer intake device 90 is fixed to the output end of the compression chamber 30. When it is closed, it can seal the output end of the compression chamber 30. When it is opened, it connects the output end of the compression chamber 30 and the input end of the transition supercharging gas storage cylinder 80.

[0063] The one-way double-layer intake device 90 is opened under the thrust of the push rod 35 after the water in the compression chamber 30 flows into the drainage device 120, so that the compressed hydrogen can enter the transition supercharging gas storage cylinder 80.

[0064] The output end of the transition supercharging gas storage cylinder 80 is connected to the intake port of the fuel cell stack 10 through the one-way intake valve 70 and the three-way valve 60 in sequence.

[0065] The hydrogen source 50, its output end is connected to the three-way valve 60 through the pressure reducing valve in sequence.

[0066] Specifically, the one-way double-layer air intake device 90 has two layers. The second layer rotates clockwise by a certain angle on the basis of the first layer, so that the gaps between the two layers are blocked from each other to prevent gas from escaping. The structure of the first layer of the one-way double-layer air intake device 90 is set (the pressure required to push open the first layer structure needs to meet certain requirements), so that the one-way double-layer air intake device 90 can only be pushed open by the push rod 35, and cannot be pushed open by the hydrogen gas pressurized in the compression chamber 30. Moreover, its structure design imitating the human heart valve further ensures that it can only open towards the transition pressurized gas storage cylinder 80.

[0067] As Figure 4 , the one-way double-layer air intake device 90 includes:

[0068] A pipeline 901, one end of which is fixed to the output end of the compression chamber 30, that is, fixed to the end face of the compression chamber 30, and the other end is connected to the transition pressurized gas storage cylinder 80 through a connecting pipe.

[0069] The first layer and the second layer are distributed along the axial direction of the pipeline 901. The first layer is arranged in the direction close to the compression chamber 30, and the second layer is arranged close to the transition pressurized gas storage cylinder 80. Both the first layer and the second layer are a bionic design imitating the human heart valve.

[0070] The first layer includes a number of rigid sheets distributed circumferentially along the pipeline 901, and adjacent rigid sheets are in contact with each other to close the one-way double-layer air intake device 90.

[0071] The large ends of the rigid sheets are fixed to the inner wall of the pipeline, and their small ends protrude towards the second layer. The adjacent small ends are in contact with each other, which is convenient for the push rod to push open, reducing resistance and power loss.

[0072] Preferably, the rigid sheet is fan-shaped.

[0073] More specifically, the rigid sheet is made of 304 stainless steel or other materials meeting the actual requirements.

[0074] The rigid sheet is relatively thin, and its thickness is designed and tested according to specific application scenarios. It can be 0.5 mm or other values to achieve the deformation and reset of the rigid sheet.

[0075] The second layer is used to seal the pipeline 901 and includes a number of flexible sheets distributed circumferentially along the pipeline 901, and adjacent flexible sheets are in contact with each other.

[0076] The large ends of the flexible sheets are fixed to the inner wall of the pipeline, and their small ends protrude towards the transition pressurized gas storage cylinder 80. The adjacent flexible sheets are in contact with each other to seal the pipeline 901 and prevent the hydrogen gas in the transition pressurized gas storage cylinder 80 from flowing back into the compression chamber 30.

[0077] Preferably, the flexible sheet is fan-shaped. The flexible sheet is made of rubber or other materials that meet the actual requirements. The flexible sheet is relatively thick, and its thickness is designed and tested according to specific application scenarios, and can be 3 times that of the rigid sheet or other values.

[0078] Furthermore, the structures of the rigid sheet and the flexible sheet are the same. The flexible sheet corresponding to the rigid sheet (corresponding along the axial direction of the pipeline 901) is rotated clockwise by 60° relative to the rigid sheet, further improving the airtightness of the compression chamber 30.

[0079] As Figure 2 shown, the working principle of the hydrogen circulation system of the fuel cell stack for drones:

[0080] The hydrogen-water mixture sequentially enters the compression chamber 30 through the exhaust port of the fuel cell stack 10 and the intake solenoid valve 130. As the mixture continuously enters, the internal pressure of the compression chamber 30 continuously increases. When the pressure (measured by the pressure sensor on the aforementioned connection channel) reaches the preset value, the intake solenoid valve 130 closes, and the push rod 35 in the compression chamber 30 starts to move towards the intake end of the transition supercharging gas storage cylinder 80 to compress the hydrogen in the compression chamber 30.

[0081] During the compression process, the push rod 35 will closely fit with the compression chamber 30. As the hydrogen pressure continuously increases, water vapor will adhere to the inner wall of the compression chamber 30 due to gravity, increased pressure, and the compressed space, and continuously converge in front of the push rod 35 as the push rod 35 advances, forming liquid water, and this part of the water is located in the compression chamber 30.

[0082] Before the push rod 35 pushes open the one-way double-layer intake device 90, the water intake solenoid valve 110 opens, and the water in the compression chamber 30 flows into the drainage device 120.

[0083] After that, the round cone shape at the front end of the push rod 35 sequentially pushes open the first layer and the second layer of the one-way double-layer intake device 90, and the compressed hydrogen and the remaining liquid water will enter the transition supercharging gas storage cylinder 80.

[0084] When the hydrogen pressure in the transition supercharging gas storage cylinder 80 reaches the value required for the one-way intake valve 70 to intake, the hydrogen will squeeze open the one-way intake valve 70, and intersect with the hydrogen released from the hydrogen source 50 through the subsequent three-way valve 60, and finally enter the intake port of the fuel cell stack 10 together.

[0085] Among them, the hydrogen source 50 releases hydrogen, and after passing through the pressure reducing valve, it intersects with the hydrogen at the three-way valve 60, and the mixed gas can meet the hydrogen pressure requirements of the fuel cell stack 10.

[0086] Among them, as the hydrogen gushes out, the pressure in the transition supercharging gas storage cylinder 80 drops rapidly. When it is less than the value required for the one-way intake valve 70 to intake, the one-way intake valve 70 automatically closes.

[0087] The water in the transition supercharged gas storage cylinder 80 can achieve a balance between loss and replenishment.

[0088] The loss refers to the water consumed for hydrogen humidification, that is, the water vapor entering the fuel cell stack 10 along with hydrogen.

[0089] Specifically, the loss means that when the drone flips and the fuselage vibrates during flight in the air, at this time, the water in the transition supercharged gas storage cylinder 80 will come into full contact with hydrogen, and then continuously humidify hydrogen. As hydrogen enters the next stage, the water will be correspondingly lost.

[0090] The replenishment refers to the water vapor and residual liquid water entering along with hydrogen when the one-way double-layer air intake device 90 is pushed open.

[0091] The intake pressure value of the one-way intake valve 70 is adjusted according to the power of different fuel cell stacks 10 and the specific pressure of the hydrogen source 50. Among them, the intake pressure value of the one-way intake valve 70 is designed based on the reduced hydrogen pressure value released by the hydrogen source (the value of the pressure reducing valve is determined in advance) and the value required by the fuel cell stack (known).

[0092] The hydrogen circulation control method for the fuel cell stack of the drone specifically includes:

[0093] The operation time of the push rod 35 for one time is T, and the compression time and the retraction time are the same;

[0094] S101. Obtain the pressure value in the compression chamber 30 and determine whether it is greater than or equal to the preset value;

[0095] If it is not greater than or equal to the preset value, the controller keeps the intake solenoid valve 130 open;

[0096] If it is greater than or equal to the preset value, the controller controls the intake solenoid valve 130 to close, and the push rod 35 starts to operate, and at this time t = 0;

[0097] S201. At the moment of t = (13 / 32)T, the controller controls the water inlet solenoid valve 110 to open, After t = (5 / 64)T, the water inlet solenoid valve 110 closes;

[0098] S301. At the moment of t = (33 / 64)T, the controller controls the water inlet solenoid valve 110 to open again, After t’ = (5 / 64)T, the water inlet solenoid valve 110 closes;

[0099] S401. At the moment of t = T, the controller controls the intake solenoid valve 130 to open.

[0100] Among them, at the moment of t = 0, the controller controls the intake solenoid valve 130 to close, which can ensure the airtightness of the compression system when the push rod 35 compresses.

[0101] At the moment of t = (13 / 32)T, the controller controls the water inlet solenoid valve 110 to open for the first drainage. This drainage does not completely drain all the water. A small amount of water will start to enter the transition supercharging gas storage cylinder 80 when the one-way double-layer air intake device 90 is pushed up at the moment of t = (1 / 2)T, maintaining the dynamic balance between the replenishment and loss of the water therein.

[0102] At the moment of t = (33 / 64)T, the controller controls the water inlet solenoid valve 110 to open for the second drainage, further ensuring that all the water is drained, creating physical space for the next cycle, and at the same time avoiding an increase in the drainage pressure in the next cycle.

[0103] The above is only the preferred embodiment of the present invention and does not impose any limitation on the present invention. Any person skilled in the art within the technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent substitution or modification and other changes to the technical solution and technical content disclosed by the present invention, all of which fall within the content of the technical solution of the present invention and still belong to the protection scope of the present invention.

Claims

1. A hydrogen circulation system for a fuel cell stack of an unmanned aerial vehicle, characterized in that Comprising: A fuel cell stack (10), whose exhaust port is connected to the input port on the compression chamber (30) through an intake electromagnetic valve (130), and whose intake port receives hydrogen; The compression chamber (30), both of whose end faces are open, one end face forms the input end of the compression chamber (30), and the other end face forms the output end of the compression chamber (30); The drain port on the compression chamber (30) is arranged close to the one-way double-layer intake device (90); when the water in the compression chamber (30) flows out through the drain port, there is no contact between the push rod (35) and the one-way double-layer intake device (90); wherein, the drain port is sequentially connected to a water inlet electromagnetic valve (110) and a drainage device (120); The push rod (35) extends into the compression chamber (30) through the input end of the compression chamber (30) and fits with the inner wall of the compression chamber (30); The one-way double-layer intake device (90) is fixed to the output end of the compression chamber (30), which can close the output end of the compression chamber (30) when it is closed, and connect the output end of the compression chamber (30) and the input end of the transition supercharging gas storage cylinder (80) when it is opened; When the water in the compression chamber (30) flows into the drainage device (120), the one-way double-layer intake device (90) is opened under the thrust of the push rod (35) to supply the compressed hydrogen into the transition supercharging gas storage cylinder (80); The output end of the transition supercharging gas storage cylinder (80) is sequentially connected to a one-way intake valve (70), a three-way valve (60) and the intake port of the fuel cell stack (10); And a hydrogen source (50), whose output end is connected to the three-way valve (60).

2. The hydrogen circulation system of the fuel cell stack for the unmanned aerial vehicle according to claim 1, wherein The one-way double-layer intake device (90) includes: A pipeline (901), one end of which is fixed to the output end of the compression chamber (30), and the other end is connected to the transition supercharging gas storage cylinder (80) through a connecting pipe; And the first layer and the second layer, which are distributed along the axial direction of the pipeline (901); the first layer is arranged close to the compression chamber (30), and the second layer is arranged close to the transition supercharging gas storage cylinder (80); The first layer includes a plurality of rigid sheets distributed along the circumferential direction of the pipeline (901), and adjacent rigid sheets are in contact with each other to close the one-way double-layer intake device (90); The large end of the rigid sheet is fixed to the inner wall of the pipeline, and its small end protrudes towards the second layer, and adjacent small ends are in contact with each other to prevent the hydrogen in the transition supercharging gas storage cylinder (80) from flowing back into the compression chamber (30); The second layer is used to seal the pipeline (901), and includes a plurality of flexible sheets distributed along the circumferential direction of the pipeline (901), and adjacent flexible sheets are in contact with each other; The large end of the flexible sheet is fixed to the inner wall of the pipeline (901), and its small end protrudes towards the transition supercharging gas storage cylinder 80; adjacent flexible sheets are in contact with each other to seal the pipeline (901).

3. The hydrogen circulation system of the fuel cell stack for the drone according to claim 2, characterized in that, The rigid sheet and the flexible sheet have the same structure; the flexible sheet is rotated 60° clockwise relative to the corresponding rigid sheet.

4. The hydrogen circulation system for a fuel cell stack of a drone according to claim 2, characterized in that, One end of the push rod (35) facing the one-way double-layer intake device (90) is a cone, and the cone contacts the center of the first layer to open the first layer.

5. A hydrogen circulation control method for a fuel cell stack of an unmanned aerial vehicle, which adopts the hydrogen circulation system for the fuel cell stack of the unmanned aerial vehicle described in any one of claims 1 to 4, characterized in that, Including the following steps: Step 1: The hydrogen-water mixture enters the compression chamber (30) successively through the exhaust port of the fuel cell stack (10) and the intake solenoid valve (130). As the mixture continuously enters, the internal pressure of the compression chamber (30) continuously increases; When the pressure reaches the preset value, the intake solenoid valve (130) closes, and the push rod (35) in the compression chamber (30) starts to move towards the intake end of the transition supercharging gas storage cylinder (80) to compress the hydrogen in the compression chamber (30); During the compression process, the air pressure in the compression chamber (30) increases. The water vapor adheres to the inner wall of the compression chamber (30) due to gravity, increased pressure, and the compressed space, and continuously converges in front of the push rod (35) as the push rod (35) advances, forming liquid water; Step 2: The water inlet solenoid valve (110) opens, and the water in the compression chamber (30) flows into the drainage device (120); Step 3: The push rod (35) successively pushes open the first layer and the second layer of the one-way double-layer intake device (90), and the compressed hydrogen and the remaining liquid water enter the transition supercharging gas storage cylinder (80); Step 4: When the hydrogen pressure in the transition supercharging gas storage cylinder (80) reaches the value required for the one-way intake valve (70) to intake, the one-way intake valve (70) conducts, and intersects with the hydrogen released from the hydrogen source (50) through the subsequent three-way valve (60), and finally together enters the intake port of the fuel cell stack (10).

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