Gas dew point flow control and switching device

Abstract

The utility model discloses a gas dew point flow control and switching device, relates to the field of fuel cells, and solves the problems of how to improve the high and low dew point adjustment efficiency of a fuel cell test system and reduce the cost. Comprising a gas filtering unit, a flow control unit and a switching unit which are sequentially connected, wherein the switching unit outputs gas into two paths; according to the utility model, a flow controller is replaced by a low-cost method of the proportional valve and the flow meter, the dew-point temperature of gas entering a galvanic pile is adjusted by controlling the flow ratio of the gas through the method of the proportional valve and the flow meter, and the quick flow distribution of dry gas and wet gas in a fuel cell test system is realized by utilizing the three-way valve; the switching speed of the gas at high and low dew points is increased, the response speed is high, and the energy consumption of the system is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of fuel cells and relates to a gas dew point flow control and switching device. Background Art

[0002] Fuel cells are the fourth generation of power generation technology after nuclear power. They can directly convert chemical energy into electricity, unaffected by the Carnot cycle, and are characterized by high efficiency and cleanliness. Due to the unique characteristics of the proton exchange membrane fuel cell (PEMFC), fuel cell humidification is required to increase power generation. Fuel cell test systems are designed to evaluate and test fuel cell performance and are used in fuel cell development and testing.

[0003] During fuel cell development and testing, simulation of various operating environments and parameters is essential. High dynamic response is key to accurate testing and evaluation. While the test system provides a suitable operating environment for the fuel cell, its ability to switch dew points under different operating conditions is crucial for evaluating the fuel cell's response speed and performance under varying operating conditions. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to improve the efficiency of high and low dew point regulation of a fuel cell test system and reduce the cost.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A gas dew point flow control and switching device comprises a gas filter unit, a flow control unit, and a switching unit; the gas filter unit, the flow control unit, and the switching unit are connected in sequence, wherein the switching unit divides the gas into two branches;

[0007] The flow control unit comprises a first proportional valve (31), a second proportional valve (32), a third proportional valve (33), a fourth proportional valve (34), a first flow meter (35), a second flow meter (36), a third flow meter (37), and a fourth flow meter (38); one end of the first proportional valve (31), one end of the second proportional valve (32), one end of the third proportional valve (33), and one end of the fourth proportional valve (34) are connected to the gas filter unit, the other end of the first proportional valve (31) is connected to one end of the first flow meter (35), the other end of the second proportional valve (32) is connected to one end of the second flow meter (36), the other end of the third proportional valve (33) is connected to one end of the third flow meter (37), the other end of the fourth proportional valve (34) is connected to one end of the fourth flow meter (38), and the other end of the first flow meter (35), the other end of the second flow meter (36), the other end of the third flow meter (37), and the other end of the fourth flow meter (38) are connected to the switching unit.

[0008] The utility model adopts a low-cost method of a proportional valve plus a flow meter to replace a flow controller, and is suitable for a low-cost test system for a high-power fuel cell stack. The method of the proportional valve plus the flow meter is used to control the flow ratio of the dry gas and the gas entering the humidification box to adjust the dew point temperature of the gas entering the fuel cell stack, thereby accelerating the switching speed of the gas at high and low dew points and achieving a fast response speed. At the same time, the common proportional valve for dry and wet gases and the flow meter are used to increase the flow range of the dry and wet gases, thereby reducing the number of flow meters used.

[0009] Preferably, the gas filtration unit comprises a filter (1) and a first pressure sensor (2); the filter (1) is connected to one end of the first pressure sensor (2), and the other end of the first pressure sensor (2) is connected to one end of a first proportional valve (31), one end of a second proportional valve (32), one end of a third proportional valve (33), and one end of a fourth proportional valve (34).

[0010] Beneficial effect: Filter the input gas.

[0011] Preferably, the switching unit comprises a first three-way valve (7) and a second three-way valve (8); the input end of the first three-way valve (7) is connected to the other end of the second flowmeter (36), the input end of the second three-way valve (8) is connected to the other end of the third flowmeter (37), one of the output ends of the first three-way valve (7) and one of the output ends of the second three-way valve (8) are connected to the other end of the first flowmeter (35) to output gas, and the other output end of the first three-way valve (7) and the other output end of the second three-way valve (8) are connected to the other end of the fourth flowmeter (38) to output gas.

[0012] Beneficial effects: The three-way valve is used to realize the flow distribution of dry gas and wet gas in the fuel cell test system, thereby improving the utilization rate of system components and reducing the size of the occupied space, greatly improving the use efficiency of the equipment and further reducing the cost of the system.

[0013] Preferably, the first proportional valve (31), the second proportional valve (32), the third proportional valve (33), and the fourth proportional valve (34) are all electromagnetic proportional valves.

[0014] Preferably, the first three-way valve (7) and the second three-way valve (8) are pneumatic valves or electric valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a flow chart of a gas dew point flow control and switching device according to the first embodiment of the present invention;

[0016] Figure 2 This is a connection structure diagram of a gas dew point flow control and switching device according to the first embodiment of the present invention. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0018] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0019] Example 1

[0020] like Figure 1 As shown, this is a flow chart of a gas dew point flow control and switching device according to the first embodiment of the present invention; it includes a gas filtration unit, a flow control unit, and a switching unit connected in sequence; wherein the switching unit outputs two gas paths, one for the dry gas branch and the other for the wet gas branch.

[0021] like Figure 2 As shown, this is a connection structure diagram of a gas dew point flow control and switching device according to the first embodiment of the present invention; the gas filtration unit includes a filter 1 and a first pressure sensor 2; the flow control unit includes a first proportional valve 31, a second proportional valve 32, a third proportional valve 33, a fourth proportional valve 34, a first flow meter 35, a second flow meter 36, a third flow meter 37, and a fourth flow meter 38; the switching unit includes a first three-way valve 7 and a second three-way valve 8.

[0022] The hydrogen / air enters the system through one end of the filter 1, and the other end of the filter 1 is connected to one end of the first pressure sensor 2. The other end of the first pressure sensor 2 is connected to one end of the first proportional valve 31, one end of the second proportional valve 32, one end of the third proportional valve 33, and one end of the fourth proportional valve 34. The other end of the first proportional valve 31 is connected to one end of the first flowmeter 35, the other end of the second proportional valve 32 is connected to one end of the second flowmeter 36, the other end of the third proportional valve 33 is connected to one end of the third flowmeter 37, and the other end of the fourth proportional valve 34 is connected to one end of the fourth flowmeter 38. The other end of the first flowmeter 35 is connected to one output end of the first three-way valve 7 and one output end of the second three-way valve 8 to output the first gas path. The other end of the second flowmeter 36 is connected to the input end of the first three-way valve 7, the other end of the third flowmeter 37 is connected to the input end of the second three-way valve 8, and the other end of the fourth flowmeter 38 is connected to the other output end of the first three-way valve 7 and the other output end of the second three-way valve 8 to output the second gas path.

[0023] The first proportional valve 31 , the second proportional valve 32 , the third proportional valve 33 and the fourth proportional valve 34 are pneumatic proportional valves, electromagnetic proportional valves, electric proportional valves and electro-hydraulic proportional valves. In this embodiment, electromagnetic proportional valves are more preferred.

[0024] The first flow meter 35, the second flow meter 36, the third flow meter 37 and the fourth flow meter 38 connected to the rear end of the first proportional valve 31, the second proportional valve 32, the third proportional valve 33 and the fourth proportional valve 34 are used to detect the gas flow, and perform PID adjustment on the opening of the first proportional valve 31 and the second proportional valve 32 at the front end to control the input of the gas flow; at the same time, the outlet flow direction of the second flow meter 36 and the third flow meter 37 is switched and controlled by the three-way valve.

[0025] Preferably, the three-way valve is a pneumatic valve or an electric valve, and the flow capacity in different directions is the same without dead zone.

[0026] The utility model adopts a low-cost method of a proportional valve plus a flow meter to replace a flow controller, which is suitable for a low-cost test system for a high-power fuel cell stack; the flow ratio of the dry gas and the gas entering the humidification box is controlled by the method of the proportional valve plus the flow meter to adjust the dew point temperature of the gas entering the fuel cell stack, thereby accelerating the switching speed of the gas at high and low dew points, having a fast response speed, reducing the energy consumption of the system, and having a low equipment cost; and the method of a proportional valve plus a flow meter and a three-way switching valve is adopted, and the flow distribution requirements of two different gases in the fuel cell test system are realized by using the three-way valve, thereby improving the utilization rate of system components and reducing the size of the space occupied, greatly improving the use efficiency of the equipment, and further reducing the cost of the system; at the same time, the flow range of the dry and wet gases is increased by adding a common proportional valve for dry and wet gases to a flow meter, thereby reducing the number of flow meters used.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A gas dew point flow control and switching device, characterized in that: It includes a gas filtering unit, a flow control unit, and a switching unit; the gas filtering unit, the flow control unit, and the switching unit are connected in sequence, wherein the switching unit divides the gas into two branches; The flow control unit comprises a first proportional valve (31), a second proportional valve (32), a third proportional valve (33), a fourth proportional valve (34), a first flow meter (35), a second flow meter (36), a third flow meter (37), and a fourth flow meter (38); one end of the first proportional valve (31), one end of the second proportional valve (32), one end of the third proportional valve (33), and one end of the fourth proportional valve (34) are connected to the gas filter unit, the other end of the first proportional valve (31) is connected to one end of the first flow meter (35), the other end of the second proportional valve (32) is connected to one end of the second flow meter (36), the other end of the third proportional valve (33) is connected to one end of the third flow meter (37), the other end of the fourth proportional valve (34) is connected to one end of the fourth flow meter (38), and the other end of the first flow meter (35), the other end of the second flow meter (36), the other end of the third flow meter (37), and the other end of the fourth flow meter (38) are connected to the switching unit.

2. A gas dew point flow control and switching device according to claim 1, characterized in that: The gas filtration unit comprises a filter (1) and a first pressure sensor (2); the filter (1) is connected to one end of the first pressure sensor (2), and the other end of the first pressure sensor (2) is connected to one end of a first proportional valve (31), one end of a second proportional valve (32), one end of a third proportional valve (33), and one end of a fourth proportional valve (34).

3. A gas dew point flow control and switching device according to claim 1, characterized in that: The switching unit comprises a first three-way valve (7) and a second three-way valve (8); an input end of the first three-way valve (7) is connected to the other end of the second flowmeter (36), an input end of the second three-way valve (8) is connected to the other end of the third flowmeter (37), one output end of the first three-way valve (7), one output end of the second three-way valve (8) and the other end of the first flowmeter (35) are connected together to output an air path, and another output end of the first three-way valve (7), another output end of the second three-way valve (8) and the other end of the fourth flowmeter (38) are connected together to output another air path.

4. A gas dew point flow control and switching device according to claim 1, characterized in that: The first proportional valve (31), the second proportional valve (32), the third proportional valve (33) and the fourth proportional valve (34) are all electromagnetic proportional valves.

5. A gas dew point flow control and switching device according to claim 3, characterized in that: The first three-way valve (7) and the second three-way valve (8) are pneumatic valves or electric valves.

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