Fuel cell cooling system

Abstract

The utility model provides a fuel cell cooling system. The main loop comprises a water pump, a first three-way valve, a first pressure sensor, a main particle filter, a second pressure sensor, a main loop switch valve and an electric pile which are sequentially connected in a closed loop manner; the auxiliary loop comprises a water pump, a first three-way valve, a second pressure sensor, a main particle filter, a first pressure sensor, an auxiliary loop switch valve, an auxiliary particle filter, a third pressure sensor, a second three-way valve, a check valve and a water tank which are sequentially connected in a closed loop mode. The main loop, the auxiliary loop, the main particle filter and the auxiliary particle filter are arranged, the valve is adjusted to reversely wash the main particle filter, the auxiliary particle filter is used for collecting impurities washed by the main particle filter, and the problem that in the prior art, the efficiency of cleaning the particle filter in the fuel cell cooling system is low is solved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cell cooling, and in particular to a fuel cell cooling system. Background Art

[0002] The fuel cell system generates electricity through electrochemical reactions inside the stack. To ensure the maximum efficiency of the chemical reaction, the temperature inside the stack needs to be kept within a certain range. The current technology uses liquid cooling (deionized coolant) for cooling. To ensure the cleanliness of the entire cooling system, a particulate filter needs to be added to the coolant inlet of the stack. If the particulate filter intercepts too many impurities and is not cleaned for a long time, the flow resistance of the entire cooling system will increase, the flow rate will decrease, the power and speed of the water pump will increase abnormally, and the pressure of the entire cooling system will also increase. In this case, it is generally necessary to shut down the machine, drain the coolant, disassemble the particulate filter and blow it, and then add coolant and water to degas after reinstallation. This takes a lot of time, that is, the cleaning efficiency is low. Utility Model Content

[0003] The main purpose of the present application is to provide a method to solve the problem of low efficiency of cleaning the particle filter in the fuel cell cooling system in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a fuel cell cooling system is provided, characterized in that it includes: a main circuit, including a water pump, a first three-way valve, a first pressure sensor, a main particulate filter, a second pressure sensor, a main circuit switch valve and a fuel cell stack which are connected in sequence and form a closed loop; an auxiliary circuit, including the water pump, the first three-way valve, the second pressure sensor, the main particulate filter, the first pressure sensor, the auxiliary circuit switch valve, the auxiliary particulate filter, the third pressure sensor, the second three-way valve, a check valve and a water tank which are connected in sequence and form a closed loop.

[0005] Furthermore, the auxiliary particle filter includes a filter screen, a limit switch, an elastic structure, and a filter screen baffle, wherein the elastic structure is located at the bottom of the auxiliary particle filter, and the elastic structure contacts one end of the filter screen close to the bottom of the auxiliary particle filter, and the limit switch contacts the filter screen baffle, wherein when the state of the limit switch changes, the filter screen moves toward the top of the auxiliary particle filter to pop out under the elastic force of the elastic structure.

[0006] Furthermore, the auxiliary particle filter also includes an outer shell and an outer cover, the outer cover is arranged on the opening of the outer shell, the outer shell has a water inlet, a water outlet and a filter slot, one end of the filter baffle is clamped in the filter slot, the water inlet is close to the top of the auxiliary particle filter, and the water outlet is close to the bottom of the auxiliary particle filter.

[0007] Furthermore, the elastic structure is a compression spring.

[0008] Furthermore, the bottom of the filter screen is a raised structure, and the raised structure is embedded in the elastic structure.

[0009] Furthermore, the fuel cell cooling system also includes an emergency circuit, which includes the second three-way valve, the fuel cell stack, and the water pump connected in sequence, wherein the auxiliary circuit is opened when the inlet of the second three-way valve is connected to the first outlet, and the emergency circuit is opened when the inlet of the second three-way valve is connected to the second outlet.

[0010] Furthermore, a connecting pipeline from the first outlet of the first three-way valve to the main particulate filter adopts a reducer, and the main circuit is opened when the inlet of the first three-way valve is connected to the second outlet, and the auxiliary circuit is opened when the inlet of the first three-way valve is connected to the first outlet.

[0011] Further, the thick end of the reducer is connected to the second outlet of the first three-way valve, and the thin end of the reducer is installed on the main particle filter.

[0012] Furthermore, the types of the main circuit switch valve and the auxiliary circuit switch valve are one of the following: electric switch valve, pneumatic switch valve; the types of the first three-way valve and the second three-way valve are one of the following: electric three-way valve, pneumatic three-way valve.

[0013] Furthermore, the types of the first pressure sensor, the second pressure sensor and the third pressure sensor are one of the following: a piezoresistive pressure sensor, a piezoelectric pressure sensor, a capacitive pressure sensor, a magnetoelectric pressure sensor, and a pressure intensity pressure sensor.

[0014] The technical solution of the present application is applied, and the main circuit includes a water pump, a first three-way valve, a first pressure sensor, a main particle filter, a second pressure sensor, a main circuit switch valve and a fuel cell stack which are sequentially connected and form a closed loop; and the auxiliary circuit includes the water pump, the first three-way valve, the second pressure sensor, the main particle filter, the first pressure sensor, the auxiliary circuit switch valve, the auxiliary particle filter, the third pressure sensor, the second three-way valve, a check valve and a water tank which are sequentially connected and form a closed loop. By setting the main circuit and the auxiliary circuit as well as the main particle filter and the auxiliary particle filter, adjusting the valve to reversely flush the main particle filter, and using the auxiliary particle filter to collect impurities flushed from the main particle filter, the problem of low efficiency of cleaning the particle filter in the cooling system of the fuel cell in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1 A schematic structural diagram of a fuel cell system provided according to an embodiment of the present application is shown;

[0017] Figure 2 A schematic structural diagram of an auxiliary particle filter provided according to an embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram of a reducer provided according to an embodiment of the present application is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Water pump; 20. First three-way valve; 30. First pressure sensor; 40. Main particulate filter; 50. Second pressure sensor; 60. Main circuit switch valve; 70. Fuel stack; 80. Auxiliary circuit switch valve; 90. Auxiliary particulate filter; 91. Filter; 92. Limit switch; 93. Elastic structure; 94. Filter baffle; 95. Casing; 96. Outer cover; 97. Water inlet; 98. Water outlet; 99. Filter slot; 100. Third pressure sensor; 110. Second three-way valve; 120. Check valve; 130. Water tank; 140. Reducer. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.

[0024] As introduced in the background art, the efficiency of cleaning the particle filter in the fuel cell cooling system in the prior art is low. In order to solve the problem of low efficiency of cleaning the particle filter in the fuel cell cooling system in the prior art, the present application proposes a fuel cell cooling system.

[0025] The utility model proposes a fuel cell cooling system. Figure 1 and Figure 2 As shown, the fuel cell cooling system includes: a main circuit, including a water pump 10, a first three-way valve 20, a first pressure sensor 30, a main particulate filter 40, a second pressure sensor 50, a main circuit switch valve 60 and a fuel cell stack 70 connected in sequence and forming a closed loop; an auxiliary circuit, including a water pump 10, a first three-way valve 20, a second pressure sensor 50, a main particulate filter 40, a first pressure sensor 30, an auxiliary circuit switch valve 80, an auxiliary particulate filter 90, a third pressure sensor 100, a second three-way valve 110, a check valve 120 and a water tank 130 connected in sequence and forming a closed loop.

[0026] By controlling the first three-way valve 20 and the main circuit switch valve 60 to close the main circuit, and controlling the first three-way valve 20 and the auxiliary circuit switch valve 80 to open the auxiliary circuit, the fuel cell coolant flows in the auxiliary circuit, thereby realizing a back flushing operation on the main particle filter 40, and flushing impurities in the main particle filter 40 into the auxiliary particle filter 90. By determining the pressure difference between the first pressure sensor 30 and the second pressure sensor 50, it is determined whether the back flushing operation on the main particle filter 40 is completed, thereby solving the problem of low efficiency of cleaning the particle filter in the fuel cell cooling system in the prior art.

[0027] In an alternative approach, Figure 2 As shown, the auxiliary particle filter 90 includes a filter screen 91, a limit switch 92, an elastic structure 93, and a filter screen baffle 94. The elastic structure 93 is located at the bottom of the auxiliary particle filter 90, and the elastic structure 93 contacts one end of the filter screen 91 close to the bottom of the auxiliary particle filter 90, and the limit switch 92 contacts the filter screen baffle 94. When the state of the limit switch 92 changes, the filter screen 91 moves toward the top of the auxiliary particle filter 90 to pop out under the elastic force of the elastic structure 93.

[0028] In an alternative approach, Figure 2 As shown, the auxiliary particle filter 90 also includes an outer shell 95 and an outer cover 96. The outer cover 96 is covered on the opening of the outer shell 95. The outer shell 95 has a water inlet 97, a water outlet 98 and a filter slot 99. One end of the filter baffle 94 is stuck in the filter slot 99. The water inlet 97 is close to the top of the auxiliary particle filter 90, and the water outlet 98 is close to the bottom of the auxiliary particle filter 90.

[0029] like Figure 2 As shown, one end of the filter baffle 94 is stuck in the filter slot 99, and the other end of the filter baffle 94 is in contact with the limit switch 92; specifically, when the auxiliary particle filter 90 needs to be cleaned, the outer cover 96 of the auxiliary particle filter 90 is opened, the limit switch 92 is pressed, and the filter 91 is ejected to the top of the auxiliary particle filter 90 under the elastic force of the elastic structure 93. The filter 91 is taken out, and the impurities at the bottom of the filter 91 are cleaned, and then the filter 91 is put back into the auxiliary particle filter 90, the filter baffle 94 is fixed, and the outer cover 96 is closed to complete the cleaning operation of the auxiliary particle filter 90.

[0030] In an optional solution, the elastic structure is a compression spring.

[0031] In an alternative approach, Figure 2 As shown, the bottom of the filter screen 91 is a raised structure, and the raised structure is embedded in the elastic structure 93. Specifically, the raised structure of the filter screen 91 is as follows: Figure 2 As shown, the filter screen 91 is embedded in the elastic structure 93 through the protruding structure, and the protruding structure is also used to collect impurities filtered in the cooling water.

[0032] In an alternative approach, Figure 1 As shown, the fuel cell cooling system also includes an emergency circuit, which includes a second three-way valve 110, a stack, and a water pump 10 connected in sequence, wherein the auxiliary circuit is opened when the inlet of the second three-way valve 110 is connected to the first outlet, and the emergency circuit is opened when the inlet of the second three-way valve 110 is connected to the second outlet. Specifically, when the emergency circuit is needed, the inlet of the first three-way valve 20 is controlled to be connected to the first outlet, the main circuit switch valve 60 is controlled to be closed and the auxiliary circuit switch valve 80 is controlled to be opened, and the inlet of the second three-way valve 110 is controlled to be connected to the second outlet, and the cooling water in the fuel cell cooling system flows in the emergency circuit to cool the stack, and then a circulating emergency circuit is formed from the stack to the water pump 10.

[0033] In an alternative approach, Figure 1 and Figure 3 As shown, the connecting pipeline from the first outlet of the first three-way valve 20 to the main particulate filter 40 adopts a reducer 140. When the inlet of the first three-way valve 20 is connected to the second outlet, the main circuit is opened, and when the inlet of the first three-way valve 20 is connected to the first outlet, the auxiliary circuit is opened.

[0034] In an optional solution, the thick end of the reducer is connected to the second outlet of the first three-way valve, and the thin end of the reducer is installed on the main particle filter.

[0035] Specifically, the structural schematic diagram of the reducer is as follows: Figure 3As shown, the use of the reducer 140 can improve the backwashing efficiency of the main particle filter, and can more quickly flush the impurities in the main particle filter into the auxiliary particle filter.

[0036] In an optional scheme, the types of the main circuit switch valve and the auxiliary circuit switch valve are one of the following: electric switch valve, pneumatic switch valve; the types of the first three-way valve and the second three-way valve are one of the following: electric three-way valve, pneumatic three-way valve.

[0037] In an optional solution, the first pressure sensor, the second pressure sensor and the third pressure sensor are of one of the following types: a piezoresistive pressure sensor, a piezoelectric pressure sensor, a capacitive pressure sensor, a magnetoelectric pressure sensor, and a pressure intensity pressure sensor.

[0038] like Figure 1 As shown, when the fuel cell system is operating normally, the coolant flows in the main circuit, and the main circuit includes a water pump 10, a first three-way valve 20, a first pressure sensor 30, a main particle filter 40, a second pressure sensor 50, a main circuit switch valve 60 and a fuel cell stack 70 that are sequentially connected and form a closed loop; when the main particle filter 40 is backwashed, the coolant flows in the auxiliary circuit, and the auxiliary circuit includes a water pump 10, a first three-way valve 20, a second pressure sensor 50, a main particle filter 40, a first pressure sensor 50, a main circuit switch valve 60 and a fuel cell stack 70 that are sequentially connected and form a closed loop. force sensor 30, auxiliary circuit switch valve 80, auxiliary particle filter 90, third pressure sensor 100, second three-way valve 110, check valve 120 and water tank 130; in emergency, the coolant flows in the emergency circuit, and the emergency circuit includes a water pump 10, a first three-way valve 20, a second pressure sensor 50, a main particle filter 40, a first pressure sensor 30, an auxiliary circuit switch valve 80, an auxiliary particle filter 90, a third pressure sensor 100, a second three-way valve 110, and a fuel cell stack 70, which are sequentially connected and form a closed loop. When the main particle filter 40 needs to be shut down for backwashing, the fuel cell cooling system is switched from the main circuit to the auxiliary circuit. When the main particle filter 40 cannot be shut down for backwashing, the fuel cell cooling system is switched from the main circuit to the emergency circuit. The problem of low efficiency of cleaning the particle filter in the fuel cell cooling system in the prior art is solved.

[0039] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0040] A fuel cell cooling system provided in an embodiment includes: a main circuit, including a water pump, a first three-way valve, a first pressure sensor, a main particle filter, a second pressure sensor, a main circuit switch valve and a fuel cell stack connected in sequence and forming a closed loop; an auxiliary circuit, including the water pump, the first three-way valve, the second pressure sensor, the main particle filter, the first pressure sensor, the auxiliary circuit switch valve, the auxiliary particle filter, the third pressure sensor, the second three-way valve, a check valve and a water tank connected in sequence and forming a closed loop. By setting the main circuit and the auxiliary circuit as well as the main particle filter and the auxiliary particle filter, adjusting the valve to reversely flush the main particle filter, and using the auxiliary particle filter to collect impurities flushed from the main particle filter, the problem of low efficiency of cleaning the particle filter in the prior art fuel cell cooling system is solved.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fuel cell cooling system, characterized in that: include: A main circuit, comprising a water pump, a first three-way valve, a first pressure sensor, a main particulate filter, a second pressure sensor, a main circuit switch valve and a fuel cell stack connected in sequence and forming a closed loop; The auxiliary circuit includes the water pump, the first three-way valve, the second pressure sensor, the main particulate filter, the first pressure sensor, the auxiliary circuit switch valve, the auxiliary particulate filter, the third pressure sensor, the second three-way valve, the check valve and the water tank which are connected in sequence to form a closed loop.

2. The fuel cell cooling system according to claim 1, characterized in that: The auxiliary particle filter includes a filter screen, a limit switch, an elastic structure, and a filter screen baffle, wherein the elastic structure is located at the bottom of the auxiliary particle filter, and the elastic structure contacts one end of the filter screen close to the bottom of the auxiliary particle filter, and the limit switch contacts the filter screen baffle, wherein when the state of the limit switch changes, the filter screen moves toward the top of the auxiliary particle filter to pop out under the elastic force of the elastic structure.

3. The fuel cell cooling system according to claim 2, characterized in that: The auxiliary particle filter also includes an outer shell and an outer cover, wherein the outer cover is arranged on the opening of the outer shell, the outer shell has a water inlet, a water outlet and a filter slot, one end of the filter baffle is arranged in the filter slot, the water inlet is close to the top of the auxiliary particle filter, and the water outlet is close to the bottom of the auxiliary particle filter.

4. The fuel cell cooling system according to claim 2 or 3, characterized in that: The elastic structure is a compression spring.

5. The fuel cell cooling system according to claim 2 or 3, characterized in that: The bottom of the filter screen is a convex structure, and the convex structure is embedded in the elastic structure.

6. The fuel cell cooling system according to claim 1, characterized in that: The fuel cell cooling system also includes an emergency circuit, which includes the second three-way valve, the fuel cell stack, and the water pump connected in sequence, wherein the auxiliary circuit is opened when the inlet of the second three-way valve is connected to the first outlet, and the emergency circuit is opened when the inlet of the second three-way valve is connected to the second outlet.

7. The fuel cell cooling system according to claim 1, characterized in that: The connecting pipeline from the first outlet of the first three-way valve to the main particle filter adopts a reducing pipe, and the inlet of the first three-way valve is connected to the second The main circuit is opened when the outlet is connected, and the auxiliary circuit is opened when the inlet of the first three-way valve is connected to the first outlet.

8. The fuel cell cooling system according to claim 7, characterized in that: The thick end of the reducer is connected to the second outlet of the first three-way valve, and the thin end of the reducer is installed on the main particle filter.

9. The fuel cell cooling system according to claim 1, characterized in that: The main circuit switch valve and the auxiliary circuit switch valve are of one of the following types: Electric on / off valve, pneumatic on / off valve; The first three-way valve and the second three-way valve are of one of the following types: Electric three-way valve, pneumatic three-way valve.

10. The fuel cell cooling system according to claim 1, characterized in that: The type of the first pressure sensor, the second pressure sensor and the third pressure sensor is one of the following: Piezoresistive pressure sensor, piezoelectric pressure sensor, capacitive pressure sensor, magnetoelectric pressure sensor, and pressure pressure sensor.

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