Hydrogen circulating device of fuel cell

Abstract

The utility model relates to the field of fuel cells, in particular to a hydrogen circulating device of a fuel cell, which comprises an equipment main body, a high-pressure gas inlet, a low-pressure gas inlet, a medium-pressure gas outlet, a mixing chamber, a diffuser and a nozzle, a mixing chamber is arranged between the low-pressure gas inlet and the nozzle, a diffuser is installed on the right side of the mixing chamber, a medium-pressure gas outlet is installed at the tail end of the equipment body, the ejector is provided with three gas inlets and three gas outlets, and the three gas inlets and the three gas outlets comprise the high-pressure gas inlet, the medium-pressure gas outlet and the low-pressure gas suction port. And no moving part is arranged, so that the energy consumption is lower, the vibration noise is lower, and the development and maintenance are easier.

Description

Technical Field

[0001] This utility model relates to the field of fuel cells, and specifically to a fuel cell hydrogen circulation device. Background Technology

[0002] The main function of a fuel cell hydrogen recirculation device is to recirculate unreacted hydrogen from the fuel cell stack back to the hydrogen inlet of the fuel cell stack, thereby improving hydrogen utilization and enhancing the water lubrication level of the fuel cell stack. Specifically, the hydrogen recirculation device reduces hydrogen waste and improves water management by reintroducing unreacted hydrogen into the fuel cell stack. A Chinese patent (authorization announcement number CN215815966 U) discloses a fuel cell hydrogen recirculation device that addresses the temperature and pressure fluctuations of the reactant gas entering the stack during hydrogen recirculation. It utilizes conventional components to avoid hydrogen waste during fuel cell stack operation, offering good economic efficiency. It also solves the problem of water vapor condensing into water in the fuel cell stack exhaust gas, which affects stack operation. However, this design suffers from high hydrogen recirculation pump energy consumption, cannot reuse unreacted hydrogen, and has poor airtightness at the high-pressure inlet. Therefore, those skilled in the art have provided a fuel cell hydrogen recirculation device to address the problems mentioned in the background art. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a fuel cell hydrogen circulation device, including a main body, a high-pressure inlet, a low-pressure inlet, a medium-pressure outlet, a mixing chamber, a diffuser, and a nozzle. The high-pressure inlet is installed at the front end of the main body, the nozzle is installed to the right of the high-pressure inlet, the low-pressure inlet is installed at the lower end of the main body, a mixing chamber is provided between the low-pressure inlet and the nozzle, a diffuser is installed to the right of the mixing chamber, and the medium-pressure outlet is installed at the rear end of the main body.

[0004] Preferably, the main body of the equipment is provided with a connector at the front end, the connector is provided with a sealing groove, and a sealing gasket is installed in the sealing groove;

[0005] Preferably, a No. 1 assembly head is installed on the side of the high-pressure air inlet, and a No. 2 assembly head is installed on the side of the low-pressure air inlet.

[0006] Preferably: a sleeve is installed inside the first assembly head, the sleeve is fixed to the side wall of the inner connector, and four first locking teeth are installed on the other side wall of the inner connector. An elastic sealing element is inserted into the first locking tooth, and the elastic sealing element is simultaneously inserted into the second locking tooth.

[0007] Preferably, the second locking tooth is installed on the side wall of the outer connector, and a plug ring is installed in the middle of the same side of the outer connector. The plug ring is inserted into the inner ring of the elastic seal. A sealing groove is provided between the plug ring and the second locking tooth, and the connecting inner ring of the elastic seal is inserted into the sealing groove.

[0008] The technical effects and advantages of this utility model are as follows:

[0009] 1. The ejector has three inlet and outlet ports: a high-pressure inlet, a medium-pressure outlet, and a low-pressure inlet. Utilizing Bernoulli's principle, it achieves efficient hydrogen circulation. Compared to a hydrogen circulation pump, the hydrogen ejector has no moving parts, resulting in lower energy consumption, less vibration and noise, and easier development and maintenance.

[0010] 2. After the high-pressure gas passes through the nozzle of the ejector, it expands adiabatically, converting pressure into kinetic energy. The flow rate increases but the pressure decreases, forming a low-pressure area in the mixing chamber. Unreacted hydrogen is drawn in and mixed with the high-pressure gas for secondary use. The mixed gas is converted back into pressure energy in the diffuser and finally discharged as a mixed fluid with a pressure higher than the inhaled fluid but lower than the high-pressure driving fluid.

[0011] 3. The main body of the equipment is equipped with a connector at the front end. The connector has a sealing groove and a sealing gasket is installed in the sealing groove. Through the tight connection of the inner connector, the elastic seal and the outer connector, gas leakage can be effectively prevented. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a fuel cell hydrogen recirculation device provided in an embodiment of this application;

[0013] Figure 2 This is a cross-sectional structural schematic diagram of a fuel cell hydrogen recirculation device provided in an embodiment of this application;

[0014] Figure 3 This application provides an embodiment of a fuel cell hydrogen recirculation device. Figure 2 A schematic diagram of structure A;

[0015] Figure 4 This is a partial structural schematic diagram of a fuel cell hydrogen recirculation device provided in an embodiment of this application;

[0016] Figure 5 This application provides an embodiment of a fuel cell hydrogen recirculation device. Figure 4 A schematic diagram of the B structure;

[0017] Figure 6 This is a schematic diagram illustrating the working principle of a fuel cell hydrogen circulation device provided in an embodiment of this application.

[0018] In the diagram: 1. Main body of the equipment; 2. High-pressure air inlet; 3. Low-pressure air inlet; 4. Sealing gasket; 5. Medium-pressure air outlet; 6. Internal connecting parts; 7. Elastic sealing parts; 8. External connecting parts; 101. Connector; 102. Sealing groove; 103. Mixing chamber; 104. Diffuser; 201. Assembly head 1; 202. Nozzle; 301. Assembly head 2; 601. Sleeve; 602. First retaining tooth; 801. Insert ring; 802. Second retaining tooth; 803. Sealing groove. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose. Example

[0020] Please see Figures 1-6 This embodiment provides a fuel cell hydrogen circulation device, including a main body 1, a high-pressure inlet 2, a low-pressure inlet 3, a medium-pressure outlet 5, a mixing chamber 103, a diffuser 104, and a nozzle 202. The high-pressure inlet 2 is installed at the front end of the main body 1, and the nozzle 202 is installed to the right of the high-pressure inlet 2. The low-pressure inlet 3 is installed at the lower end of the main body 1. A mixing chamber 103 is provided between the low-pressure inlet 3 and the nozzle 202. The diffuser 104 is installed to the right of the mixing chamber 103. The medium-pressure outlet 5 is installed at the rear end of the main body 1.

[0021] Specifically, the main body 1 of the equipment is provided with a connector 101 at the first end. The connector 101 is provided with a sealing groove 102. A sealing gasket 4 is installed in the sealing groove 102. A first assembly head 201 is installed on the side end of the high-pressure air inlet 2. A second assembly head 301 is installed on the side end of the low-pressure air inlet 3. A sleeve 601 is installed in the first assembly head 201. The sleeve 601 is fixed to the side wall of the inner connector 6. Four first retaining teeth 602 are installed on the other side wall of the inner connector 6. An elastic seal 7 is inserted into the first retaining tooth 602. The elastic seal 7 is simultaneously inserted into the second retaining tooth 802. The second retaining tooth 802 is installed on the side wall of the outer connector 8. A plug ring 801 is installed in the middle of the same side of the outer connector 8. The plug ring 801 is inserted into the inner ring of the elastic seal 7. A sealing groove 803 is provided between the plug ring 801 and the second retaining tooth 802. The connecting inner ring of the elastic seal 7 is inserted into the sealing groove 803.

[0022] The working principle of this utility model is as follows:

[0023] The ejector has three inlet and outlet ports, including a high-pressure inlet 2, a medium-pressure outlet 5, and a low-pressure intake port 3. By utilizing Bernoulli's theorem, it achieves efficient hydrogen circulation. After the high-pressure gas passes through the nozzle 202 of the ejector, it expands adiabatically, converting pressure into kinetic energy. The flow rate increases but the pressure decreases, forming a low-pressure region in the mixing chamber 103. Unreacted hydrogen is drawn in and mixed with the high-pressure gas for secondary utilization. The mixed gas is converted back into pressure energy in the diffuser 104, and finally a mixed fluid with a pressure higher than the intake fluid but lower than the high-pressure driving fluid is discharged.

[0024] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A fuel cell hydrogen circulation device characterized by comprising: The utility model provides a kind of high-pressure low-pressure mixing device, including equipment body (1), high-pressure air inlet (2), low-pressure air inlet (3), middle-pressure air outlet (5), mixing chamber (103), diffuser (104) and nozzle (202), equipment body (1) first end installs high-pressure air inlet (2), high-pressure air inlet (2) right side installs nozzle (202), equipment body (1) lower end installs low-pressure air inlet (3), and mixing chamber (103) is equipped between low-pressure air inlet (3) and nozzle (202), mixing chamber (103) right side installs diffuser (104), equipment body (1) end installs middle-pressure air outlet (5).

2. A fuel cell hydrogen circulation device according to claim 1, wherein The first end of the equipment body (1) is provided with a connecting head (101).

3. A fuel cell hydrogen circulation device according to claim 2, wherein The connecting head (101) is provided with a sealing groove (102) inside.

4. A fuel cell hydrogen circulation device according to claim 3, wherein The sealing groove (102) is provided with a sealing gasket (4) inside.

5. The fuel cell hydrogen circulation device according to claim 1, wherein The high-pressure air inlet (2) is provided with a first assembly head (201) at the side end, and the low-pressure air inlet (3) is provided with a second assembly head (301) at the side end.

6. A fuel cell hydrogen circulation device according to claim 5, wherein The first assembly head (201) is provided with a sleeve (601) inside, and the sleeve (601) is fixed to the side wall of an inner connecting piece (6). The other side wall of the inner connecting piece (6) is provided with four first clamping teeth (602).

7. A fuel cell hydrogen circulation device according to claim 6, wherein The first clamping teeth (602) are provided with an elastic sealing element (7) inside, and the elastic sealing element (7) is also clamped into the second clamping teeth (802).

8. A fuel cell hydrogen circulation device according to claim 7, wherein The second clamping teeth (802) are fixed to the side wall of an outer connecting piece (8), and the outer connecting piece (8) is provided with an insertion ring (801) at the same side in the middle. The insertion ring (801) is inserted into the inner ring of the elastic sealing element (7).

9. A fuel cell hydrogen circulation device according to claim 8, wherein The insertion ring (801) and the second clamping teeth (802) are provided with a sealing clamping groove (803) therebetween, and the sealing clamping groove (803) is provided with the connecting inner ring of the elastic sealing element (7) clamped therein.

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