Integrated multi-ejector assembly for fuel cell

Abstract

The utility model relates to an integrated multi-ejector assembly for a fuel cell. The integrated multi-ejector assembly comprises a hydrogen shut-off valve, a hydrogen proportional valve, an ejector body, an ejector outlet and a pressure release valve, an inlet runner, a connecting runner, an injection runner, a hydrogen proportional valve mounting hole and a reflux inlet are formed in the ejector body; a hydrogen shut-off valve is fixed on the ejector body, the number of the injection flow channels is at least two, a hydrogen proportional valve mounting hole is formed in the ejector body corresponding to the position of an air inlet of each injection flow channel, a hydrogen proportional valve is mounted on each hydrogen proportional valve mounting hole, each hydrogen proportional valve is provided with a nozzle, and the nozzles are arranged on the ejector body. And the apertures of the nozzles of all the hydrogen proportional valves are unequal. When the ejector is used, the ejection capacity range of the ejector can be enlarged, meanwhile, the hydrogen turn-off control function and the in-pile pressure overpressure relief function in a hydrogen supply loop are integrated, and the function integration degree is improved; the utility model can effectively save the space of the galvanic pile and reduce the weight of the galvanic pile.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen fuel cells, and specifically discloses an integrated multi-ejector assembly for a fuel cell. Background Art

[0002] An ejector is a hydrogen circulation subsystem at the anode end of a fuel cell that generates a hydrogen reflux function. It can suck out the unconsumed hydrogen in the stack and reflux it. After mixing with the supplied hydrogen, it supplies hydrogen to the stack, enabling the stack to reach a higher anode stoichiometric ratio and preventing flooding.

[0003] In the ejector, the high-pressure hydrogen gas flows through the proportional valve nozzle, and the pressure energy in the fluid is converted into kinetic energy, accelerating the gas flow while reducing the pressure, thereby generating a low-pressure area. The pressure difference between the anode end of the stack and this low-pressure area causes the mixed gas in the stack to be sucked into the ejector. Subsequently, it enters the venturi-shaped flow channel together with the high-speed flowing hydrogen. The gas is fully mixed and the kinetic energy is reconverted into pressure energy, increasing the gas pressure and pushing the mixed gas into the stack.

[0004] The functions of existing ejectors are generally relatively single, only realizing the ejector reflux function. During the use of a fuel cell stack, other components (such as a shut-off valve and a safety valve, etc.) need to be integrated to build the hydrogen supply circuit, resulting in a complex structure, increased design costs, and wasted space. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an integrated multi-ejector assembly for a fuel cell that can increase the ejector capacity range while integrating the hydrogen shut-off control function and the overpressure relief function of the inlet pressure to the stack, and can effectively save the stack space and reduce the stack weight.

[0006] According to the technical solution provided by the utility model, the integrated multi-ejector assembly for a fuel cell includes a hydrogen shut-off valve, a hydrogen proportional valve, an ejector body, an ejector outlet, and a pressure relief valve;

[0007] An inlet flow channel, a connection flow channel, a jet flow channel, a hydrogen proportional valve mounting hole, and a reflux port are formed on the ejector body;

[0008] A hydrogen shut-off valve is fixed on the ejector body. The outlet of the inlet flow channel is connected to the inlet of the hydrogen shut-off valve, and the outlet of the hydrogen shut-off valve is connected to the inlet of the connection flow channel;

[0009] The number of the jet flow channels is at least two. A hydrogen proportional valve mounting hole is formed on the ejector body at the inlet position corresponding to each jet flow channel, and a hydrogen proportional valve is installed on each hydrogen proportional valve mounting hole. The hydrogen proportional valve has a nozzle, and the nozzle apertures of all hydrogen proportional valves are not equal;

[0010] The air outlet of the connecting flow channel is connected to the air inlet of the hydrogen ratio valve, the nozzle of the hydrogen ratio valve is connected to the air inlet of the injection flow channel, and a return port is provided on the ejector body corresponding to the air inlet position of each injection flow channel;

[0011] An ejector outlet is fixed on the ejector body corresponding to the air outlet position of the injection flow channel. An outlet flow channel and a pressure relief flow channel are provided in the ejector outlet. The outlet flow channel has a main air outlet and a pressure relief air outlet;

[0012] The air outlet of the injection flow channel is connected to the air inlet of the outlet flow channel, the pressure relief air outlet of the outlet flow channel is connected to the air inlet of the pressure relief flow channel, and the pressure relief valve is installed in the pressure relief flow channel.

[0013] Preferably, the injection flow channel is in the shape of a Venturi tube.

[0014] Preferably, the air outlet of the hydrogen shut-off valve is directly opposite to the air inlet of the hydrogen ratio valve.

[0015] Preferably, the number of the injection flow channels is two. A hydrogen ratio valve mounting hole is provided on the ejector body corresponding to the air inlet position of each injection flow channel, and a hydrogen ratio valve is installed on each hydrogen ratio valve mounting hole.

[0016] Using the present utility model can integrate the hydrogen shut-off control function and the overpressure relief function of the inlet pressure in the hydrogen supply circuit while increasing the ejector's ejecting capacity range, improving the function integration degree; the present utility model can effectively save the fuel cell space and reduce the fuel cell weight. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present utility model. Detailed Embodiments

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] An integrated multi-ejector assembly for a fuel cell, as Figure 1 shown, which includes a hydrogen shut-off valve 1, a hydrogen ratio valve 2, an ejector body 3, an ejector outlet 4 and a pressure relief valve 5;

[0020] An inlet flow channel 3.1, a connection flow channel 3.2, a jet flow channel 3.3, a hydrogen proportion valve mounting hole 3.4 and a return port 3.5 are formed in the ejector body 3.

[0021] A hydrogen shut-off valve 1 is fixed on the ejector body 3. The air outlet of the inlet flow channel 3.1 is connected to the air inlet of the hydrogen shut-off valve 1, and the air outlet of the hydrogen shut-off valve 1 is connected to the air inlet of the connection flow channel 3.2.

[0022] The number of the jet flow channels 3.3 is at least two. A hydrogen proportion valve mounting hole 3.4 is formed in the ejector body 3 at the position corresponding to the air inlet of each jet flow channel 3.3. A hydrogen proportion valve 2 is mounted on each hydrogen proportion valve mounting hole 3.4. The hydrogen proportion valve 2 has a nozzle, and the nozzle apertures of all the hydrogen proportion valves 2 are not equal to each other.

[0023] The air outlet of the connection flow channel 3.2 is connected to the air inlet of the hydrogen proportion valve 2. The nozzle of the hydrogen proportion valve 2 is connected to the air inlet of the jet flow channel 3.3. A return port 3.5 is formed in the ejector body 3 at the position corresponding to the air inlet of each jet flow channel 3.3.

[0024] An ejector outlet 4 is fixed on the ejector body 3 at the position corresponding to the air outlet of the jet flow channel 3.3. An outlet flow channel 4.1 and a pressure relief flow channel 4.2 are formed in the ejector outlet 4. The outlet flow channel 4.1 has a main air outlet and a pressure relief air outlet.

[0025] The air outlet of the jet flow channel 3.3 is connected to the air inlet of the outlet flow channel 4.1. The pressure relief air outlet of the outlet flow channel 4.1 is connected to the air inlet of the pressure relief flow channel 4.2. The pressure relief valve 5 is mounted in the pressure relief flow channel 4.2.

[0026] The jet flow channel 3.3 is in the shape of a Venturi tube.

[0027] The air outlet of the hydrogen shut-off valve 1 is directly opposite to the air inlet of the hydrogen proportion valve 2, which can make the connection flow channel 3.2 shorter and the pressure loss smaller.

[0028] The working principle of the present invention is described below by taking two hydrogen proportion valves 2 mounted on the ejector body 3 as an example:

[0029] The number of the jet flow channels 3.3 is two. A hydrogen proportion valve mounting hole 3.4 is formed in the ejector body 3 at the position corresponding to the air inlet of each jet flow channel 3.3. A hydrogen proportion valve 2 is mounted on each hydrogen proportion valve mounting hole 3.4.

[0030] When the hydrogen shut-off valve 1 is de-energized, high-pressure hydrogen cannot enter the inlet of the hydrogen proportioning valve 2 through the inlet flow channel 3.1 and the connecting flow channel 3.2. At this time, the ejector body 3 does not work; when the hydrogen shut-off valve 1 is energized, high-pressure hydrogen can enter the hydrogen proportioning valve 3 through the inlet flow channel 3.1 and the connecting flow channel 3.2.

[0031] When the hydrogen demand of the fuel cell stack is small, the hydrogen proportioning valve 2 of the large-diameter nozzle is de-energized at this time, and the hydrogen proportioning valve 2 of the small-diameter nozzle is energized. High-pressure hydrogen flows through the nozzle of the hydrogen proportioning valve 2, and the pressure energy in the gas is converted into kinetic energy, accelerating the gas flow while reducing the pressure, thereby generating a low-pressure area. A pressure difference is generated between the anode end of the stack and this low-pressure area, causing the mixed gas in the stack to be sucked into the ejector through the return port 3.5, and then enter the injection flow channel 3.3 in the shape of a Venturi tube together with the high-speed flowing hydrogen. The gas is fully mixed and the kinetic energy is converted back into pressure energy, increasing the gas pressure, and pushing the mixed gas through the outlet flow channel 4.1 of the ejector outlet 4 into the stack.

[0032] When the hydrogen demand of the fuel cell stack is large, the hydrogen proportioning valve 2 of the small-diameter nozzle can no longer meet the hydrogen flow requirement of the stack. At this time, the hydrogen proportioning valve 2 of the large-diameter nozzle starts to be energized, and the working principle is the same as above. If the pressure of the outlet flow channel 4.1 of the ejector outlet 4 exceeds the set value of the pressure relief valve 5, to protect the stack and prevent the inlet pressure from being too high, the pressure relief valve 5 opens to discharge the excess mixed gas into the atmosphere.

[0033] Finally, it should be noted that the above specific implementation manners are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An integrated multi-ejector assembly for a fuel cell, characterized by: It comprises a hydrogen shut-off valve (1), a hydrogen proportional valve (2), an ejector body (3), an ejector outlet (4) and a pressure relief valve (5); The ejector body (3) is provided with an inlet flow channel (3.1), a connecting flow channel (3.2), an injection flow channel (3.3), a hydrogen proportional valve mounting hole (3.4) and a reflux port (3.5); A hydrogen shut-off valve (1) is fixed on the ejector body (3), the gas outlet of the inlet flow channel (3.1) is connected to the gas inlet of the hydrogen shut-off valve (1), and the gas outlet of the hydrogen shut-off valve (1) is connected to the gas inlet of the connecting flow channel (3.2); The number of the injection flow channels (3.3) is at least two, and a hydrogen proportional valve mounting hole (3.4) is provided on the ejector body (3) at the air inlet position corresponding to each injection flow channel (3.3), and a hydrogen proportional valve (2) is mounted on each hydrogen proportional valve mounting hole (3.4), the hydrogen proportional valve (2) having a nozzle, and the nozzle apertures of all hydrogen proportional valves (2) are not equal; The gas outlet of the connecting flow channel (3.2) is connected to the gas inlet of the hydrogen proportional valve (2), the nozzle of the hydrogen proportional valve (2) is connected to the gas inlet of the injection flow channel (3.3), and a return port (3.5) is provided on the ejector body (3) at the gas inlet position corresponding to each injection flow channel (3.3); An ejector outlet (4) is fixed on the ejector body (3) at a position corresponding to the air outlet of the injection channel (3.3), an outlet channel (4.1) and a pressure relief channel (4.2) are provided in the ejector outlet (4), and the outlet channel (4.1) has a main air outlet and a pressure relief air outlet; The air outlet of the injection flow channel (3.3) is connected to the air inlet of the outlet flow channel (4.1), the pressure relief air outlet of the outlet flow channel (4.1) is connected to the air inlet of the pressure relief flow channel (4.2), and the pressure relief valve (5) is installed in the pressure relief flow channel (4.2).

2. The integrated multi-ejector assembly for a fuel cell according to claim 1, characterized in that: The jet flow channel (3.3) is in the shape of a Venturi tube.

3. The integrated multi-ejector assembly for a fuel cell according to claim 1, characterized in that: The number of the injection flow channels (3.3) is two, and one of the hydrogen proportional valve mounting holes (3.4) is provided on the ejector body (3) at the air inlet position corresponding to each injection flow channel (3.3), and one hydrogen proportional valve (2) is mounted on each hydrogen proportional valve mounting hole (3.4).

4. The integrated multi-ejector assembly for a fuel cell according to claim 1, characterized in that: The gas outlet of the hydrogen shut-off valve (1) is directly opposite to the gas inlet of the hydrogen proportional valve (2).

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