Fuel cell pressure on-line detection device

Abstract

The application belongs to the technical field of fuel cell detection, and is especially a fuel cell pressure online detection device, which comprises a fuel cell main body, an air inlet pipe one, a backflow pipe, an air inlet pipe two and a discharge pipe are arranged on the fuel cell main body, valves are connected to the air inlet pipe one and the air inlet pipe two, pressure detection assemblies are connected to the two valves, the pressure detection assembly comprises a cross pipe, a branch pipe is arranged on the cross pipe, a coiled pipe is installed on the branch pipe, a diaphragm type pressure sensor is arranged at the end of the coiled pipe away from the branch pipe, and the coiled pipe and the diaphragm type pressure sensor are connected through a gas leakage buffer mechanism. Residual gas in the coiled pipe can be discharged through the gas leakage buffer mechanism, so that the working gas concentration in the whole pressure detection assembly is kept consistent, and therefore, the working gas pressure detected by the diaphragm type pressure sensor can be kept consistent with the working gas pressure entering the fuel cell main body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell detection, and particularly relates to a fuel cell pressure on-line detection device. BACKGROUND

[0002] A fuel cell is a power generation device that directly and efficiently converts the chemical energy of a combustible gas (such as hydrogen, methane, etc.) and an oxidant (such as oxygen) into electrical energy. Among them, a proton exchange membrane fuel cell (PEMFC) has a wide application prospect in the fields of transportation and fixed power generation due to its low working temperature, fast start-up, high energy density and other advantages. The fuel cell stack is the core of the fuel cell system, and its performance, efficiency and service life directly determine the commercialization level of the entire system. During the operation of the fuel cell stack, the inlet pressure of the combustible gas and air is a crucial control parameter.

[0003] The combustible gas and air are separated by a proton exchange membrane. It is necessary to ensure that the pressure on the combustible gas side is slightly higher than that on the air side, so as to prevent the oxygen on the air side from penetrating to the combustible gas side and reacting with the combustible gas on the catalyst surface to generate a local high temperature (burning membrane), which seriously damages the membrane electrode. Generally, this pressure difference is strictly controlled within a very small range.

[0004] In the detection operation of the fuel cell, a diaphragm type pressure sensor is usually added at the combustible gas inlet end and the air inlet end of the fuel cell to detect the pressure of the combustible gas and air entering the fuel cell. However, the diaphragm of the diaphragm type pressure sensor is easily deformed irreversibly due to impact in the moment of contact with high-pressure gas, thereby affecting the detection accuracy of the diaphragm type pressure sensor.

[0005] In the prior art, in order to prevent the gas in the pipeline from impacting the diaphragm type pressure sensor, a coiled tube is usually arranged between the pipeline and the diaphragm type pressure sensor to buffer the high-speed flowing gas. However, air is left in the coiled tube. When the diaphragm type pressure sensor detects the pressure of the combustible gas in the pipeline subsequently, the diaphragm type pressure sensor detects the pressure of the mixed gas of the combustible gas and the air in the coiled tube, rather than the pressure of the pure combustible gas in the pipeline (under the same volume and temperature, the pressure is mainly related to the number of gas molecules, therefore, the pressures generated by different gases under the same volume and temperature are also different), which finally causes the inaccuracy of the detection result. Therefore, a fuel cell pressure on-line detection device is proposed. SUMMARY

[0006] The present application proposes a fuel cell pressure on-line detection device to solve the problems in the prior art.

[0007] In order to achieve the above object, the present application adopts the following technical scheme: a fuel cell pressure on-line detection device, comprising a fuel cell main body, the fuel cell main body is provided with an inlet pipe one, a return pipe, an inlet pipe two and a discharge pipe, the inlet pipe one and the inlet pipe two are both connected with a valve, the two valves are both connected with a pressure detection assembly, the pressure detection assembly comprises a cross pipe, the cross pipe is provided with a branch pipe, the branch pipe is provided with a coiled pipe, one end of the coiled pipe away from the branch pipe is provided with a diaphragm type pressure sensor, the coiled pipe and the diaphragm type pressure sensor are connected through a gas leakage buffer mechanism, the gas leakage buffer mechanism is used for discharging the residual gas in the coiled pipe during the gas input process of the cross pipe to the valve, and reducing the impact of the upward flowing gas on the diaphragm type pressure sensor.

[0008] Preferably, the gas leakage buffer mechanism comprises a circular shell, two ends of the circular shell are respectively provided with a circular pipe one and a circular pipe two, the circular pipe two is used for fixed connection with the end of the coiled pipe, the diaphragm type pressure sensor is fixedly connected with the circular pipe one, and a cylindrical probe extending into the circular shell through the circular pipe one is arranged on the diaphragm type pressure sensor, a sealing ring sleeved outside the cylindrical probe is arranged in the circular pipe one.

[0009] Preferably, the circular pipe two is fixedly installed with a hollow disc two, the hollow disc two is rotatably installed with a screw rod in a penetrating mode, the bottom end of the screw rod is fixedly installed with a paddle, the hollow disc two is threadedly sleeved with a ball sleeve, the hollow disc one is fixedly sleeved on the ball sleeve, the hollow disc one is fixedly sleeved with a ring blocking cylinder which is in sliding connection with the inner wall of the circular shell, and a plurality of gas leakage holes are arranged on the inner wall of the circular shell in a circumferential array mode.

[0010] Preferably, the top end of the screw rod is rotatably installed with a blocking plate, the diameter of the blocking plate is equal to the diameter of the cylindrical probe, the blocking plate is located directly below the cylindrical probe, the same spring is fixedly installed between the blocking plate and the hollow disc one, and the spring is sleeved on the screw rod.

[0011] Preferably, the inner side of the ring blocking cylinder is fixedly installed with a flexible blocking ring, the inner diameter of the flexible blocking ring is equal to the diameter of the cylindrical probe, the top of the flexible blocking ring is flush with the top of the ring blocking cylinder, the bottom of the flexible blocking ring is provided with a taper slope one, and the bottom of the blocking plate is provided with a taper slope two.

[0012] Preferably, a plurality of guide grooves are arranged on the inner wall of the circular shell in a circumferential array mode, and a plurality of guide rods are fixedly installed on the outer side of the ring blocking cylinder in a circumferential array mode, and the plurality of guide rods are slidably installed in the corresponding guide grooves.

[0013] Preferably, the ring filter screen is embeddedly fixedly installed on the outer side of the circular shell, and the ring filter screen is used for covering the plurality of gas leakage holes.

[0014] Preferably, the fuel cell body is internally provided with a proton exchange membrane, both sides of the proton exchange membrane are provided with catalyst layers, and both catalyst layers are provided with gas diffusion layers on the sides away from each other.

[0015] Preferably, when the top end of the flexible stop ring is attached to the top of the circular shell, the bottom end of the cylindrical probe is flush with the bottom of the flexible stop ring.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] By setting the air release buffer mechanism, the residual gas in the coiled pipe can be discharged, and the consistency of the working gas concentration inside the entire pressure detection assembly is ultimately ensured, so that the working gas pressure detected by the subsequent diaphragm type pressure sensor can be consistent with the working gas pressure entering the fuel cell body.

[0018] By setting the air release buffer mechanism between the diaphragm type pressure sensor and the coiled pipe, the gas discharged from the coiled pipe can be prevented from directly impacting the diaphragm on the diaphragm type pressure sensor, thereby providing better protection for the diaphragm type pressure sensor.

[0019] By setting two valves, the working gas pressure can reach the specified pressure and then enter the fuel cell body through the air inlet pipe one and the air inlet pipe two at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A front view structural schematic diagram of a fuel cell pressure online detection device is provided in the present application;

[0021] Figure 2 A structural schematic diagram of a pressure detection assembly in a fuel cell pressure online detection device is provided in the present application;

[0022] Figure 3 A partial side sectional view of a pressure detection assembly in a fuel cell pressure online detection device is provided in the present application;

[0023] Figure 4 A side sectional view of an air release buffer mechanism in a fuel cell pressure online detection device is provided in the present application;

[0024] Figure 5 A front view side sectional view of an air release buffer mechanism and a partial diaphragm type pressure sensor in a fuel cell pressure online detection device is provided in the present application; Figure 1

[0025] Figure 6 A front view side sectional view of an air release buffer mechanism and a partial diaphragm type pressure sensor in a fuel cell pressure online detection device is provided in the present application; Figure 2 ​​

[0026] Figure 7 Figure 1 is a front view of a fuel cell body in a fuel cell pressure on-line detection device according to the present application.

[0027] Figure 1 is a front view of a fuel cell body in a fuel cell pressure on-line detection device according to the present application.

[0028] 11, proton exchange membrane; 12, catalyst layer; 13, gas diffusion layer;

[0029] 71, horizontal pipe; 72, branch pipe; 73, coiled pipe; 74, air release buffer mechanism; 75, diaphragm type pressure sensor; 751, cylindrical probe;

[0030] 741, round housing; 742, round pipe one; 743, round pipe two; 744, air release hole; 745, ring stop cylinder; 746, hollowed-out round disc one; 747, hollowed-out round disc two; 748, ball sleeve; 749, screw rod; 7410, paddle; 7411, flexible stop ring; 7412, taper slope one; 7413, partition plate; 7414, spring; 7415, taper slope two; 7416, ring filter screen; 7417, guide groove; 7418, guide rod; 7419, sealing ring. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0032] Please refer to Figures 1-7 The present application provides a technical solution: a fuel cell pressure on-line detection device, comprising a fuel cell body 1, the fuel cell body 1 is provided with an air inlet pipe one 2, a return pipe 3, an air inlet pipe two 4 and an exhaust pipe 5, the air inlet pipe one 2 and the air inlet pipe two 4 are both connected with a valve 6, the two valves 6 are both connected with a pressure detection assembly 7, the pressure detection assembly 7 comprises a horizontal pipe 71, the horizontal pipe 71 is provided with a branch pipe 72, the branch pipe 72 is installed with a coiled pipe 73, the coiled pipe 73 is provided with a diaphragm type pressure sensor 75 at the end away from the branch pipe 72, the coiled pipe 73 and the diaphragm type pressure sensor 75 are connected through an air release buffer mechanism 74, the air release buffer mechanism 74 is used to release the residual gas in the coiled pipe 73 during the process of inputting gas into the valve 6 through the horizontal pipe 71, and to reduce the impact of the upward flowing gas on the diaphragm type pressure sensor 75.

[0033] Further, the combustible gas and oxygen enter the inside of the fuel cell main body 1 through the gas inlet pipe 2 and the gas inlet pipe 4 respectively to react, the combustible gas after the reaction is recycled through the return pipe 3, the exhaust gas + produced water after the reaction is discharged through the discharge pipe 5, both valves 6 are motor controlled, both valves 6 can be opened and closed synchronously, in the following description, the combustible gas and oxygen can be collectively referred to as working gas.

[0034] The air release buffer mechanism 74 includes a circular shell 741, two ends of the circular shell 741 are respectively provided with a circular pipe one 742 and a circular pipe two 743, the circular pipe two 743 is used for fixedly connected with the end of the coiled pipe 73, the diaphragm type pressure sensor 75 is fixedly connected with the circular pipe one 742, and a cylindrical probe 751 extending into the circular shell 741 through the circular pipe one 742 is arranged on the diaphragm type pressure sensor 75, and a sealing ring 7419 sleeved outside the cylindrical probe 751 is arranged in the circular pipe one 742.

[0035] The hollow disc two 747 is fixedly installed in the circular pipe two 743, the lead screw 749 is rotatably installed in the hollow disc two 747 in a penetrating mode, the paddle 7410 is fixedly installed at the bottom end of the lead screw 749, the ball sleeve 748 is threadedly sleeved on the hollow disc two 747, the hollow disc one 746 is fixedly sleeved on the hollow disc two 747, the ring stop cylinder 745 is fixedly sleeved on the hollow disc one 746 and is in sliding connection with the inner wall of the circular shell 741, and the plurality of air release holes 744 are arranged in a circumferential array on the inner wall of the circular shell 741.

[0036] The baffle plate 7413 is rotatably installed at the top end of the lead screw 749, the diameter of the baffle plate 7413 is equal to the diameter of the cylindrical probe 751, the baffle plate 7413 is located directly below the cylindrical probe 751, the same spring 7414 is fixedly installed between the baffle plate 7413 and the hollow disc one 746, and the spring 7414 is sleeved on the lead screw 749.

[0037] The flexible stop ring 7411 is fixedly installed on the inner side of the ring stop cylinder 745, the inner diameter of the flexible stop ring 7411 is equal to the diameter of the cylindrical probe 751, the top of the flexible stop ring 7411 is flush with the top of the ring stop cylinder 745, the bottom of the flexible stop ring 7411 is provided with a taper slope one 7412, and the bottom of the baffle plate 7413 is provided with a taper slope two 7415.

[0038] Further, the working gas discharged from the ring stop cylinder 745 is discharged from the middle of the flexible stop ring 7411 and impacts on the taper slope two 7415 at the bottom of the baffle plate 7413, and the working gas sprayed upwards is dispersed around, so that the diaphragm on the cylindrical probe 751 is not directly impacted by the working gas, and the diaphragm on the cylindrical probe 751 is better protected.

[0039] The inner wall of the circular shell 741 is provided with a plurality of guide grooves 7417 arranged in a circumferential array. The outer side of the ring baffle 745 is fixedly installed with a plurality of guide rods 7418 arranged in a circumferential array. The plurality of guide rods 7418 are slidably installed in the corresponding guide grooves 7417.

[0040] An embedded and fixed ring filter 7416 is mounted on the outer side of the circular housing 741. The ring filter 7416 is used to cover multiple vent holes 744.

[0041] The fuel cell body 1 has a proton exchange membrane 11 inside, and catalyst layers 12 are provided on both sides of the proton exchange membrane 11. Gas diffusion layers 13 are provided on the side of the two catalyst layers 12 that are far apart from each other.

[0042] When the top of the flexible retaining ring 7411 is in contact with the top of the circular housing 741, the bottom of the cylindrical probe 751 is flush with the bottom of the flexible retaining ring 7411.

[0043] Furthermore, such as Figures 5-6 As shown, the working gas flowing through the second circular tube 743 drives the blade 7410 to rotate. The blade 7410 then drives the lead screw 749 to rotate. The lead screw 749 then drives the hollowed-out disc 746 and the ring retainer 745 to move upward simultaneously through the ball sleeve 748. When the top of the flexible retaining ring 7411 is in contact with the inner wall of the top of the circular shell 741, the flexible retaining ring 7411 is simultaneously fitted onto the outside of the cylindrical probe 751. When working gas is always flowing through the horizontal tube 71, the circular shell 7411... 1. The internal pressure is always maintained. At this time, the compressed spring 7414 will exert downward pressure on the hollow disc 746. If the compressed spring 7414 wants to drive the flexible retaining ring 7411 to move down, the flexible retaining ring 7411 needs to compress the working gas below. However, the downward force on the flexible retaining ring 7411 is not enough to compress the working gas below, thus ensuring that the top of the flexible retaining ring 7411 is always in contact with the inner wall of the top of the circular shell 741.

[0044] When the working gas pressure inside the horizontal tube 71 is zero, the compressed spring 7414 pushes the hollow disc 746 down and fits against the bottom of the circular shell 741. At this time, the inside and outside of the circular shell 741 can be connected through multiple vent holes 744.

[0045] In this embodiment: During detection, two diaphragm pressure sensors 75 are connected to a computer, two valves 6 are closed, and then combustible gas is input into the pressure detection component 7 on the side of the first air inlet pipe 2, and oxygen is input into the pressure detection component 7 on the side of the second air inlet pipe 4. In the following description, combustible gas and oxygen are both referred to as working gas.

[0046] The working gas flows through the cross pipe 71, and is blocked by the valve 6 at the outlet end of the cross pipe 71. The working gas enters the coiled pipe 73 through the branch pipe 72, and is slowed down by the coiled pipe 73. The working gas then enters the circular shell 741 through the second circular pipe 743. In this process, the residual gas in the coiled pipe 73 and the circular shell 741 is pushed out of the multiple gas leakage holes 744 by the working gas, so that only the working gas exists in the entire pressure detection assembly 7.

[0047] As mentioned above, the working gas passing through the second circular pipe 743 drives the paddle 7410 to rotate, which in turn drives the screw rod 749 to rotate. The rotation of the screw rod 749 drives the hollow disc 746 to move upwards through the ball sleeve 748. The hollow disc 746 drives the ring blocking cylinder 745 to move upwards. When the top of the conical slope 7412 that moves upwards with the ring blocking cylinder 745 is in contact with the inner wall of the top of the circular shell 741, the ring blocking cylinder 745 blocks the multiple gas leakage holes 744. At this time, the circular shell 741 is in a closed state, and the pressure of the working gas detected by the cylindrical probe 751 is the pressure of the working gas in the cross pipe 71. In this process, the internal state of the gas leakage buffer mechanism 74 is as shown in Figure 5 converted into Figure 6 ;

[0048] When the pressures of the combustible gas and the oxygen detected by the two pressure detection assemblies 7 are at the target pressure, the two valves 6 can be opened at the same time. Then the combustible gas and the oxygen can enter the inside of the fuel cell main body 1 to react. The reacted combustible gas is recycled through the return pipe 3, and the reacted waste gas + generated water is discharged through the discharge pipe 5.

[0049] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A fuel cell pressure on-line detection device comprising a fuel cell main body (1), characterized by: The fuel cell body (1) is provided with an air inlet pipe (2), a return pipe (3), an air inlet pipe (2) and an exhaust pipe (5), the air inlet pipe (2) and the air inlet pipe (4) are connected with the valve (6), the two valves (6) are connected with the pressure detection assembly (7), the pressure detection assembly (7) includes a cross pipe (71), the cross pipe (71) is provided with a branch pipe (72), the branch pipe (72) is installed with coiled pipe (73), the coiled pipe (73) is provided with a diaphragm type pressure sensor (75) away from the branch pipe (72), the coiled pipe (73) and diaphragm type pressure sensor (75) are connected through the air release buffer mechanism (74), the air release buffer mechanism (74) is used for discharging the residual gas in the coiled pipe (73) during the process of inputting gas into the valve (6) of the cross pipe (71), and reducing the impact of the gas flowing upward on the diaphragm type pressure sensor (75); The air release buffer mechanism (74) includes a circular shell (741), the two ends of the circular shell (741) are respectively provided with a circular pipe (742) and a circular pipe (743), the circular pipe (743) is used for fixed connection with the end of the coiled pipe (73), the diaphragm type pressure sensor (75) is fixedly connected with the circular pipe (742), and the diaphragm type pressure sensor (75) is provided with a cylindrical probe (751) extending into the circular shell (741) through the circular pipe (742), the circular pipe (742) is provided with a sealing ring (7419) sleeved outside the cylindrical probe (751); The circular pipe (743) is fixedly installed with a hollow disc (747), the hollow disc (747) is rotatably installed with a screw rod (749) in a penetrating mode, the bottom end of the screw rod (749) is fixedly installed with a paddle (7410), the hollow disc (747) is threadedly sleeved with a ball sleeve (748), the ball sleeve (748) is fixedly sleeved with a hollow disc (746), the hollow disc (746) is fixedly sleeved with a ring baffle (745) which is slidably connected with the inner wall of the circular shell (741), a plurality of air release holes (744) are arranged in a circumferential array on the inner wall of the circular shell (741); The top end of the screw rod (749) is rotatably installed with a baffle (7413), the diameter of the baffle (7413) is equal to the diameter of the cylindrical probe (751), the baffle (7413) is located directly below the cylindrical probe (751), the same spring (7414) is fixedly installed between the baffle (7413) and the hollow disc (746), and the spring (7414) is sleeved on the screw rod (749).

2. The on-line fuel cell pressure detection device according to claim 1, wherein: The flexible baffle ring (7411) is fixedly installed in the inside of the ring baffle cylinder (745), the inner diameter of the flexible baffle ring (7411) is equal to the diameter of the cylindrical probe (751), the top of the flexible baffle ring (7411) is flush with the top of the ring baffle cylinder (745), and the bottom of the flexible baffle ring (7411) is provided with a taper one (7412).

3. The on-line fuel cell pressure detection device according to claim 1, wherein: A plurality of guide grooves (7417) are arranged in a circumferential array on the inner wall of the circular shell (741), and a plurality of guide rods (7418) are fixedly installed in a circumferential array on the outside of the ring baffle cylinder (745), and the guide rods (7418) are respectively slidably installed in the corresponding guide grooves (7417).

4. The on-line fuel cell pressure detection device of claim 1, wherein: The ring filter screen (7416) is fixedly installed in an embedded manner on the outside of the circular shell (741), and the ring filter screen (7416) is used for covering the plurality of air vent holes (744).

5. The on-line fuel cell pressure detection device of claim 1, wherein: The inside of the fuel cell main body (1) is provided with a proton exchange membrane (11), both sides of the proton exchange membrane (11) are provided with catalyst layers (12), and both sides of the two catalyst layers (12) away from each other are respectively provided with gas diffusion layers (13).

6. The on-line fuel cell pressure detection device of claim 2, wherein: When the top end of the flexible baffle ring (7411) is attached to the top of the circular shell (741), the bottom end of the cylindrical probe (751) is flush with the bottom of the flexible baffle ring (7411).

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