CN212874555U

CN212874555U - Structure for eliminating negative air pressure of anode of fuel cell forklift system

Info

Publication number: CN212874555U
Application number: CN202022105749.6U
Authority: CN
Inventors: 李凯; 朱俊娥; 陈海涛; 赖平化; 欧阳洵
Original assignee: Tianjin New Hydrogen Power Technology Co ltd
Current assignee: Tianjin New Hydrogen Power Technology Co ltd
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2021-04-02
Anticipated expiration: 2030-09-23

Abstract

The utility model discloses an eliminate structure of fuel cell fork truck system positive pole negative pressure, concretely relates to fuel cell technical field, including the fuel cell pile, a tip lateral wall of fuel cell pile is provided with the positive inlet port, one side of positive inlet port is provided with the positive output port, another tip lateral wall of fuel cell pile is provided with the negative output port, one side of negative output port is provided with the negative inlet port, the outside that the tip of positive inlet port is located the fuel cell pile is connected with first trachea, install the proportional valve on the first trachea, the outside that the tip of positive output port is located the fuel cell pile is connected with the second trachea. The utility model discloses a fuel cell system operates when shutting down for a period, keeps a large amount of nitrogen gas at the negative pole and seals with the seal valve, prevents to consume the negative pressure that positive pole hydrogen produced by the internal resistance after the shutdown, has prolonged the life of fuel cell pile, and the part is few, with low costs, simple structure, easily operation.

Description

Structure for eliminating negative air pressure of anode of fuel cell forklift system

Technical Field

The utility model relates to a fuel cell technical field, more specifically say, the utility model relates to an eliminate structure of fuel cell fork truck system positive pole negative pressure.

Background

When a fuel cell system is shut down after running for a period of time, hydrogen with certain pressure can be sealed at the anode, the cathode can continuously provide air to enter the cathode because the air compressor does not have sealing performance, at the moment, hydrogen in the anode can be continuously consumed by the internal resistance of the galvanic pile under the condition of no load, the pressure of the anode can be reduced until negative pressure is generated due to the consumption of the hydrogen, the negative pressure can not only affect an anode pipeline, but also can absorb the air in the cathode through a membrane electrode, so that a hydrogen-air interface can be generated at the anode in the process of restarting, and the service life of the galvanic pile can be affected after multiple times of starting and stopping.

It is therefore a current problem to design a structure that eliminates the negative anode pressure of a fuel cell forklift system.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned defect of prior art, the embodiment of the utility model provides an eliminate structure of fuel cell fork truck system positive pole subatmospheric pressure, when fuel cell system operation shut down for a period, through keeping a large amount of nitrogen gas and sealing with the seal valve at the negative pole, prevent to consume the negative pressure that positive pole hydrogen produced by the internal resistance after shutting down to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a structure for eliminating negative air pressure of an anode of a fuel cell forklift system comprises a fuel cell stack, wherein an anode inlet port is arranged on the outer side wall of one end of the fuel cell stack, an anode outlet port is arranged on one side of the anode inlet port, a cathode outlet port is arranged on the outer side wall of the other end of the fuel cell stack, a cathode inlet port is arranged on one side of the cathode outlet port, a first air pipe is connected to the outer side of the anode inlet port, a proportional valve is arranged on the first air pipe, a second air pipe is connected to the outer side of the anode outlet port, an exhaust valve is arranged on the second air pipe, a third air pipe is connected to the outer side of the cathode outlet port, a cathode backpressure valve is arranged on the third air pipe, and a fourth air pipe is connected to the outer side of the cathode inlet port, and a sealing valve is arranged on the fourth air pipe, and one side, far away from the fuel cell stack, of one end of the fourth air pipe is connected with an air compressor.

In a preferred embodiment, a protective shell is arranged outside the fuel cell stack, and through holes are arranged on the outer wall of the protective shell at positions corresponding to the outside of the male inlet port, the male outlet port, the female outlet port and the female inlet port.

In a preferred embodiment, one end of the first air pipe is connected with the end of the male inlet port through a pipe connector, one end of the second air pipe is connected with the end of the male outlet port through a pipe connector, and sealing rings are arranged at the connection positions of the first air pipe and the second air pipe.

In a preferred embodiment, one end of the third gas pipe is connected with the end of the female outlet port through a pipe connector, one end of the fourth gas pipe is connected with the end of the female inlet port through a pipe connector, and a sealing ring is arranged at the connection position of the third gas pipe and the end of the female inlet port.

In a preferred embodiment, the input port and the output port of the exhaust valve are connected with the second air pipe through flanges, and rubber rings are arranged at the joints.

In a preferred embodiment, an air inlet port of the air compressor is externally connected with an air inlet pipe, and the air compressor is fixedly connected with the mounting frame at the position through a bolt.

In a preferred embodiment, the input port and the output port of the cathode backpressure valve are connected with the third gas pipe through flanges, and a rubber pad is arranged at the connection position.

The utility model has the advantages that: the utility model discloses a fuel cell system moves when shutting down for a period, keep a large amount of nitrogen gas and seal with the seal valve at the negative pole, prevent the negative pressure that produces by internal resistance consumption positive pole hydrogen after shutting down, consumption oxygen characteristic has adjusted the shutdown process when utilizing fuel cell pile electricity generation, the nitrogen gas that exists in the negative pole is kept as far as possible, and simultaneously, seal the negative pole after the completion of shutting down, at this moment because the negative pole does not have oxygen to exist, the pile can't produce the electric current, positive pole hydrogen also does not consume, the positive pole can not descend and also can not produce the negative pressure, and then the life of fuel cell pile has been prolonged, and the part is few, low cost, moreover, the steam generator is simple in structure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of an external structure of a fuel cell stack according to the present invention.

FIG. 3 is an enlarged view of portion A of FIG. 1 according to the present invention;

the reference signs are: 1. a fuel cell stack; 2. a male input port; 3. a male port; 4. a female port; 5. a female input port; 6. a first air pipe; 7. a proportional valve; 8. a second air pipe; 9. an exhaust valve; 10. a third air pipe; 11. a cathode back pressure valve; 12. a fourth gas pipe; 13. a sealing valve; 14. an air compressor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The structure shown in fig. 1-3 for eliminating negative pressure of anode of a fuel cell forklift system comprises a fuel cell stack 1, an anode inlet port 2 is arranged on an outer side wall of one end of the fuel cell stack 1, an anode outlet port 3 is arranged on one side of the anode inlet port 2, a cathode outlet port 4 is arranged on an outer side wall of the other end of the fuel cell stack 1, a cathode inlet port 5 is arranged on one side of the cathode outlet port 4, a first air pipe 6 is connected to an end of the anode inlet port 2 positioned on an outer side of the fuel cell stack 1, a proportional valve 7 is installed on the first air pipe 6, a second air pipe 8 is connected to an end of the anode outlet port 3 positioned on an outer side of the fuel cell stack 1, an exhaust valve 9 is installed on the second air pipe 8, a third air pipe 10 is connected to an end of the cathode outlet port 4 positioned on an outer side of the fuel cell stack 1, a cathode valve 11 is installed on the third air pipe 10, a fourth air pipe 12 is connected, a sealing valve 13 is installed on the fourth air pipe 12, and an air compressor 14 is connected to one end of the fourth air pipe 12 away from the fuel cell stack 1.

As shown in fig. 1-2, a protective shell is disposed outside the fuel cell stack 1, and through holes are disposed on outer walls of the protective shell corresponding to the anode inlet port 2, the anode outlet port 3, the cathode outlet port 4 and the cathode inlet port 5, so as to protect the fuel cell stack 1.

As shown in fig. 1, one end of the first gas pipe 6 is connected to the end of the male inlet port 2 through a pipe connector, one end of the second gas pipe 8 is connected to the end of the male outlet port 3 through a pipe connector, and sealing rings are disposed at the joints of the first gas pipe 6 and the second gas pipe 8, so as to facilitate connection between the first gas pipe 6 and the second gas pipe 8.

As shown in fig. 1, one end of the third air tube 10 is connected to the end of the female outlet port 4 through a tube connector, one end of the fourth air tube 12 is connected to the end of the female inlet port 5 through a tube connector, and the joints of the third air tube 10 and the fourth air tube 12 are provided with sealing rings to facilitate connection of the third air tube 10 and the fourth air tube 12.

As shown in fig. 1, the input port and the output port of the exhaust valve 9 are connected with the second air pipe 8 through flanges, and a rubber ring is arranged at the joint, so that the exhaust valve 9 can be conveniently installed, and further the anode pressure and the anode sealing are improved.

As shown in the attached drawing 1, the air inlet port of the air compressor 14 is externally connected with an air inlet pipe, and the air compressor 14 is fixedly connected with the mounting frame at the position through bolts, so that the air compressor 14 is convenient to mount, and an air source is provided for the fuel cell stack 1.

As shown in fig. 3, the input port and the output port of the cathode back pressure valve 11 are connected to the third gas pipe 10 by flanges, and a rubber pad is disposed at the joint, so as to facilitate installation of the cathode back pressure valve 11, and further facilitate improvement of the cathode pressure and cathode sealing of the fuel cell stack 1 in the use process.

The utility model discloses the theory of operation: the utility model relates to a structure for eliminating negative pressure of anode of fuel cell forklift system, the end of the anode inlet port 2 of the fuel cell stack 1 is connected with a first air pipe 6, a proportional valve 7 is arranged on the first air pipe 6, which is convenient for providing hydrogen source for the fuel cell stack 1 and improving hydrogen pressure; the end part of the anode outlet port 3 is connected with a second air pipe 8, and an exhaust valve 9 is arranged on the second air pipe 8, so that the anode pressure and the anode sealing are conveniently improved; the end part of the cathode outlet port 4 is connected with a third gas pipe 10, and a cathode backpressure valve 11 is installed on the third gas pipe 10, so that the cathode pressure and the cathode seal of the fuel cell stack 1 are improved in the using process; a fourth air pipe 12 is connected to the end of the female port 5, which is located at the outer side of the fuel cell stack 1, a sealing valve 13 is installed on the fourth air pipe 12, and an air compressor 14 is connected to one side of the fourth air pipe 12, which is far away from the fuel cell stack 1, so as to provide an air source for the fuel cell stack 1; when the fuel cell system is shut down after operating for a period of time, keeping the load at the working condition of 0.1A/cm2, opening the proportional valve 7 and closing the exhaust valve 9 to maintain the anode pressure, then closing the air compressor 14 and the cathode backpressure valve 11 to consume the oxygen in the cathode, and closing the proportional valve 7 and the sealing valve 13 after operating for one minute to ensure that a large amount of nitrogen is kept at the cathode and sealed by the sealing valve 13 in the shutdown process, so as to prevent the negative pressure generated by the anode hydrogen consumed by internal resistance after shutdown, and adjust the shutdown process by utilizing the characteristics of the oxygen consumed during the power generation of the fuel cell stack 1 to keep the nitrogen in the cathode as much as possible, and simultaneously seal the cathode after the shutdown is completed, at the moment, because the cathode does not have oxygen, the stack cannot generate current, the anode hydrogen is not consumed, the anode cannot drop and generate the negative pressure, thereby prolonging the service life of the fuel, and the parts are few, the cost is low, the structure is simple, and the operation is easy.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are referred to, and other structures can refer to the common design, and under the condition of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

and finally: the above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for eliminating negative air pressure of an anode of a fuel cell forklift system comprises a fuel cell stack (1), and is characterized in that: the fuel cell stack is characterized in that an anode inlet port (2) is arranged on the outer side wall of one end portion of the fuel cell stack (1), an anode outlet port (3) is arranged on one side of the anode inlet port (2), an cathode outlet port (4) is arranged on the outer side wall of the other end portion of the fuel cell stack (1), an cathode inlet port (5) is arranged on one side of the cathode outlet port (4), a first air pipe (6) is connected to the outer side, located on the fuel cell stack (1), of the end portion of the anode inlet port (2), a proportional valve (7) is installed on the first air pipe (6), a second air pipe (8) is connected to the outer side, located on the fuel cell stack (1), of the end portion of the anode outlet port (3), an exhaust valve (9) is installed on the second air pipe (8), a third air pipe (10) is connected to the outer side, located on the fuel cell stack (1), and a cathode back pressure valve (11, the end part of the negative inlet port (5) is positioned on the outer side of the fuel cell stack (1) and is connected with a fourth air pipe (12), a sealing valve (13) is installed on the fourth air pipe (12), and one side, away from the fuel cell stack (1), of one end of the fourth air pipe (12) is connected with an air compressor (14).

2. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: the outside of fuel cell pile (1) is provided with the protecting crust, and the outer wall of protecting crust corresponds the outside position department of positive inlet port (2), positive output port (3), negative output port (4) and negative inlet port (5) and all is provided with the through-hole.

3. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: the one end of first trachea (6) is connected through the pipe connector between the tip of positive inlet port (2), also be connected through the pipe connector between the one end of second trachea (8) and the tip of positive outlet port (3), and its junction all is provided with the sealing washer.

4. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: one end of the third air pipe (10) is connected with the end part of the female outlet port (4) through a pipe connector, one end of the fourth air pipe (12) is connected with the end part of the female inlet port (5) through a pipe connector, and sealing rings are arranged at the connection parts of the third air pipe and the female inlet port.

5. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: the input port and the output port of the exhaust valve (9) are connected with the second air pipe (8) through flanges, and rubber rings are arranged at the joints.

6. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: the air inlet port of the air compressor (14) is externally connected with an air inlet pipe, and the air compressor (14) is fixedly connected with the mounting frame at the position through bolts.

7. The structure of claim 1, wherein the negative air pressure of the anode of the fuel cell forklift system is eliminated by: the input port and the output port of the cathode backpressure valve (11) are connected with the third air pipe (10) through flanges, and a rubber pad is arranged at the joint.