CN211425782U

CN211425782U - Fuel cell system part leakage detection device

Info

Publication number: CN211425782U
Application number: CN202021575939.8U
Authority: CN
Inventors: 刘帅锋; 罗欣; 谷军; 郭洋; 沈晓明
Original assignee: Henan Yuqing Power Co ltd
Current assignee: Henan Yuqing Power Co ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2020-09-04
Anticipated expiration: 2030-08-03

Abstract

The utility model discloses a fuel cell system spare part leakage detection device, including supporting box, host computer, mounting panel, first gaseous subassembly, the gaseous subassembly that collects of second, fuel cell stack, gas control subassembly and nitrogen cylinder, the inside fixed mounting of supporting box has fuel cell stack, and the top fixed mounting of supporting box has the host computer, the one end fixedly connected with mounting panel at supporting box top, the utility model discloses the beneficial effect who reaches is: the utility model discloses a detection of spare part is realized to the control of electrical part to the host computer, break-make through controlling different spare parts, reach each spare part on the collection piecemeal and detect one by one and the purpose that the collection piecemeal detected simultaneously, the feedback value through observing the device has realized the control of pressure and flow simultaneously, and increased automatically controlled devices such as flowmeter, solenoid valve, make the leak hunting process more convenient, the testing result is more accurate, communication between host computer and the device has been realized, thereby very big improvement detection efficiency.

Description

Fuel cell system part leakage detection device

Technical Field

The utility model relates to a spare part leak testing device, in particular to fuel cell system spare part leak testing device belongs to detection device technical field.

Background

In the existing life, a fuel cell is a chemical device which directly converts chemical energy of fuel into electric energy, also called an electrochemical generator, and is a fourth power generation technology after hydroelectric power generation, thermal power generation and atomic power generation, single parts need to be subjected to one-by-one leakage detection before assembly in the detection of leakage of gas and antifreeze parts of a fuel cell system, and the currently adopted common method is to detect the quality of the parts by adopting a nitrogen cylinder and an external silica gel tube, and the detection method has the defects of complicated butt joint of the parts, inaccurate leakage detection, low efficiency and the like, so that an efficient and accurate system part leakage detection device is needed.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome prior art's defect, provide a fuel cell system spare part leak testing device.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model relates to a fuel cell system spare part leakage detection device, including supporting box, host computer, mounting panel, first gas set subassembly, second gas set subassembly, fuel cell stack, gas control subassembly and nitrogen cylinder, the inside fixed mounting of supporting box has the fuel cell stack, the top fixed mounting of supporting box has the host computer, the one end fixed connection at supporting box top has the mounting panel, the one end of the outside of mounting panel far away from the host computer is provided with first gas set subassembly, first gas set subassembly includes first gas set subassembly, the one end fixed connection of the outside of mounting panel far away from the host computer has first gas set subassembly, the outside of first gas set subassembly has set gradually solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, fifth solenoid valve and sixth solenoid valve, the hydrogen gas circulation pump is arranged at one end, away from the first gas collecting and partitioning block, of the first electromagnetic valve, the gas humidifier is arranged between one ends, away from the first gas collecting and partitioning block, of the second electromagnetic valve and one end, away from the first gas collecting and partitioning block, of the third electromagnetic valve, the first flow meter is arranged at one end, away from the first gas collecting and partitioning block, of the first exhaust electromagnetic valve, the second gas collecting and partitioning block is arranged at one end, away from the first gas collecting and partitioning block, of the outer side of the mounting plate, the gas control assembly is arranged between the first gas collecting and partitioning block and the second gas collecting and partitioning block, and one end of the gas control assembly is connected with a nitrogen gas bottle through a pipeline.

In a preferred embodiment of the present invention, the second gas manifold assembly includes a second gas manifold block, a second gas collection block is fixedly arranged at one end of the outer side of the mounting plate far away from the first gas collection block, the outer side of the second gas collecting and partitioning block is sequentially provided with a seven electromagnetic valve, an eight electromagnetic valve, a nine electromagnetic valve, a ten electromagnetic valve, an eleven electromagnetic valve and a twelve electromagnetic valve, an intercooler is arranged at one end of the No. ten electromagnetic valve, which is far away from the second gas collecting and partitioning block, a gas separator is arranged at one end of the No. eleven electromagnetic valve, which is far away from the second gas collecting and partitioning block, a self-control part is arranged at one end of the twelve-gauge electromagnetic valve, which is far away from the second gas collection and separation block, a second exhaust electromagnetic valve is arranged at one end of the second gas collection and separation block, and a second flowmeter is arranged at one end, far away from the second gas collection and separation block, of the second exhaust electromagnetic valve.

As a preferred scheme of the utility model, gas control assembly includes the nitrogen gas pressure reducer, be provided with the nitrogen gas pressure reducer between first gas set piecemeal and the second gas set piecemeal, first proportional valve, second pressure sensor and first mechanical relief valve have set gradually between nitrogen gas pressure reducer and the second gas set piecemeal, second proportional valve, third pressure sensor and second mechanical relief valve have set gradually between nitrogen gas pressure reducer and the first gas set piecemeal.

As an optimized scheme of the utility model, all be provided with first pressure sensor between No. four solenoid valves, No. five solenoid valves, No. six solenoid valves and the fuel cell stack.

As an optimized proposal of the utility model, the nitrogen pressure reducer is connected with the nitrogen cylinder through a conveying pipeline.

As a preferred scheme of the utility model, first proportional valve, second pressure sensor, third pressure sensor, first exhaust solenoid valve, second exhaust solenoid valve, first flowmeter, second flowmeter, solenoid valve, No. two solenoid valves, No. three solenoid valves, No. four solenoid valves, No. five solenoid valves, No. six solenoid valves, first pressure sensor, No. seven solenoid valves, No. eight solenoid valves, No. nine solenoid valves, No. ten solenoid valves, No. eleven solenoid valves and No. twelve solenoid valves all with upper computer electrical connection.

As a preferred scheme of the utility model, the one end that first gas collection piecemeal was kept away from to No. four solenoid valves, No. five solenoid valves and No. six solenoid valves all is connected with the inlet end of fuel cell stack, the one end that second gas collection piecemeal was kept away from to No. seven solenoid valves, No. eight solenoid valves and No. nine solenoid valves all is connected with the outlet end of fuel cell stack, No. four solenoid valves are hydrogen chamber electric pile inlet solenoid valve, No. five solenoid valves are air chamber inlet solenoid valve, No. six solenoid valves are cooling chamber inlet solenoid valve, No. seven solenoid valves are hydrogen chamber electric pile outlet solenoid valve, No. eight solenoid valves are air chamber outlet solenoid valve, No. nine solenoid valves are cooling chamber outlet solenoid valve.

The utility model discloses the beneficial effect who reaches is: the utility model discloses a detection of spare part is realized to the control of electrical part to the host computer, break-make through controlling different spare parts, reach each spare part on the collection piecemeal and detect one by one and the purpose that the collection piecemeal detected simultaneously, the feedback value through observing the device has realized the control of pressure and flow simultaneously, and increased automatically controlled devices such as flowmeter, solenoid valve, make the leak hunting process more convenient, the testing result is more accurate, communication between host computer and the device has been realized, thereby very big improvement detection efficiency.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of the external structure of the present invention;

fig. 2 is a schematic view of the internal principle of the present invention.

In the figure: 1. a support box; 2. an upper computer; 3. mounting a plate; 4. a first gas manifold assembly; 41. a first gas cluster block; 42. a first electromagnetic valve; 43. a second electromagnetic valve; 44. a third electromagnetic valve; 45. a fourth electromagnetic valve; 46. a fifth electromagnetic valve; 47. a number six electromagnetic valve; 48. a hydrogen circulation pump; 49. a gas humidifier; 410. a first pressure sensor; 411. a first exhaust solenoid valve; 412. a first flow meter; 5. a second gas manifold assembly; 51. a second gas cluster block; 52. a seventh electromagnetic valve; 53. a number eight electromagnetic valve; 54. a solenoid valve No. nine; 55. a ten-gauge solenoid valve; 56. a No. eleven electromagnetic valve; 57. a twelve-gauge electromagnetic valve; 58. an intercooler; 59. a gas separator; 510. self-made parts; 511. a second exhaust solenoid valve; 512. a second flow meter; 6. a fuel cell stack; 7. a gas control assembly; 71. a nitrogen pressure reducer; 72. a first proportional valve; 73. a second pressure sensor; 74. a first mechanical pressure relief valve; 75. a second proportional valve; 76. a third pressure sensor; 77. a second mechanical pressure relief valve; 8. a nitrogen cylinder.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Examples

As shown in fig. 1-2, the utility model provides a fuel cell system parts leak testing device, including supporting box 1, host computer 2, mounting panel 3, first gas collection subassembly 4, second gas collection subassembly 5, fuel cell stack 6, gas control subassembly 7 and nitrogen cylinder 8, the inside fixed mounting of supporting box 1 has fuel cell stack 6, is convenient for better protecting fuel cell stack 6 through supporting box 1; the top of the support box 1 is fixedly provided with an upper computer 2, one end of the top of the support box 1 is fixedly connected with a mounting plate 3, one end of the outer side of the mounting plate 3, which is far away from the upper computer 2, is provided with a first gas collecting and distributing assembly 4, the first gas collecting and distributing assembly 4 comprises a first gas collecting and distributing block 41, one end of the outer side of the mounting plate 3, which is far away from the upper computer 2, is fixedly connected with the first gas collecting and distributing block 41, the outer side of the first gas collecting and distributing block 41 is sequentially provided with a first electromagnetic valve 42, a second electromagnetic valve 43, a third electromagnetic valve 44, a fourth electromagnetic valve 45, a fifth electromagnetic valve 46 and a sixth electromagnetic valve 47, one end of the first electromagnetic valve 42, which is far away from the first gas collecting and distributing block 41, is provided with a hydrogen circulating pump 48, a gas humidifier 49 is arranged between one ends of the second electromagnetic valve 43 and the third electromagnetic valve 44, which are far away, a first flow meter 412 is arranged at one end of the first exhaust solenoid valve 411 far away from the first gas manifold block 41, the exhaust amount is controlled by the better opening time of the first exhaust solenoid valve 411 through the arrangement of the first exhaust solenoid valve 411 and the first flow meter 412, a second gas manifold block 5 is arranged at one end of the outer side of the mounting plate 3 far away from the first gas manifold block 4, and the first gas manifold block 4 and the second gas manifold block 5 are better mounted through the mounting plate 3; a gas control assembly 7 is arranged between the first gas manifold assembly 4 and the second gas manifold assembly 5, and one end of the gas control assembly 7 is connected with a nitrogen gas bottle 8 through a pipeline, so that nitrogen gas can be stored better.

Further, the second gas manifold assembly 5 comprises a second gas manifold block 51, a second gas manifold block 51 is fixedly mounted at one end of the outer side of the mounting plate 3 far away from the first gas manifold block 41, a seventh electromagnetic valve 52, an eighth electromagnetic valve 53, a ninth electromagnetic valve 54, a tenth electromagnetic valve 55, an eleventh electromagnetic valve 56 and a twelfth electromagnetic valve 57 are sequentially arranged at the outer side of the second gas manifold block 51, an intercooler 58 is arranged at one end of the tenth electromagnetic valve 55 far away from the second gas manifold block 51, a gas separator 59 is arranged at one end of the eleventh electromagnetic valve 56 far away from the second gas manifold block 51, a self-control part 510 is arranged at one end of the twelfth electromagnetic valve 57 far away from the second gas manifold block 51, a second exhaust electromagnetic valve 511 is arranged at one end of the second gas manifold block 51, a second flow meter 512 is arranged at one end of the second exhaust electromagnetic valve 511 far away from the second gas manifold block 51, the first gas manifold subassembly 4 and the second gas manifold subassembly 5 are convenient for better butt joint of parts with various specifications and sizes, the first gas manifold block 41 and the second gas manifold block 51 are both six-position eight-hole gas manifold blocks, and the six positions can be connected with silicone tubes with different sizes for jointing parts to be detected with different specifications.

Further, gas control assembly 7 includes nitrogen gas pressure reducer 71, be provided with nitrogen gas pressure reducer 71 between first gas set piecemeal 41 and the second gas set piecemeal 51, first proportional valve 72 has set gradually between nitrogen gas pressure reducer 71 and the second gas set piecemeal 51, second pressure sensor 73 and first mechanical relief valve 74, second proportional valve 75 has set gradually between nitrogen gas pressure reducer 71 and the first gas set piecemeal 41, third pressure sensor 76 and second mechanical relief valve 77, guarantee through setting up first mechanical relief valve 74 and second mechanical relief valve 77 be convenient for better to spare part, can not cause the condition of spare part damage to take place because of misoperation, simultaneously to gaseous decompression before gaseous entering detection device, decrement and to being surveyed spare part and carry out mechanical protection.

Further, first pressure sensors 410 are arranged between the fourth electromagnetic valve 45, the fifth electromagnetic valve 46 and the sixth electromagnetic valve 47 and the fuel cell stack 6, and the pressure inside the pipeline can be displayed better by arranging the first pressure sensors 410.

Further, nitrogen gas pressure reducer 71 is connected through pipeline with nitrogen cylinder 8, is convenient for better adjusting the size of inlet end pressure through nitrogen gas pressure reducer 71.

Further, the first proportional valve 72, the second proportional valve 75, the second pressure sensor 73, the third pressure sensor 76, the first exhaust solenoid valve 411, the second exhaust solenoid valve 511, the first flowmeter 412, the second flowmeter 512, the first solenoid valve 42, the second solenoid valve 43, the third solenoid valve 44, the fourth solenoid valve 45, the fifth solenoid valve 46, the sixth solenoid valve 47, the first pressure sensor 410, the seventh solenoid valve 52, the eighth solenoid valve 53, the ninth solenoid valve 54, the tenth solenoid valve 55, the eleventh solenoid valve 56 and the twelfth solenoid valve 57 are all electrically connected with the upper computer 2, so that the communication between the upper computer 2 and the device can be better guaranteed, and the whole device can be better controlled.

Further, the ends of the fourth electromagnetic valve 45, the fifth electromagnetic valve 46 and the sixth electromagnetic valve 47 far away from the first gas collecting and partitioning block 41 are all connected with the gas inlet end of the fuel cell stack 6, the ends of the seventh electromagnetic valve 52, the eighth electromagnetic valve 53 and the ninth electromagnetic valve 54 far away from the second gas collecting and partitioning block 51 are all connected with the gas outlet end of the fuel cell stack 6, the fourth electromagnetic valve 45 is a hydrogen cavity stack gas inlet electromagnetic valve, the fifth electromagnetic valve 46 is an air cavity gas inlet electromagnetic valve, the sixth electromagnetic valve 47 is a cooling cavity gas inlet electromagnetic valve, the seventh electromagnetic valve 52 is a hydrogen cavity stack gas outlet electromagnetic valve, the eighth electromagnetic valve 53 is an air cavity gas outlet electromagnetic valve, the ninth electromagnetic valve 54 is a cooling cavity gas outlet electromagnetic valve, the gas inlet of the hydrogen production and gas control cavity stack is facilitated through the fourth electromagnetic valve 45, the gas inlet of the air cavity is facilitated through the fifth electromagnetic valve 46, the gas inlet of the cooling cavity is facilitated through the sixth electromagnetic valve 47, meanwhile, the seventh solenoid valve 52 is convenient for better controlling the air inlet and outlet of the hydrogen cavity stack, the eighth solenoid valve 53 is convenient for better controlling the air outlet of the air cavity, and the ninth solenoid valve 54 is convenient for better controlling the air outlet of the cooling cavity.

Specifically, in use, the nitrogen gas cylinder 8 is opened to release nitrogen gas therein, a required pressure is set through the nitrogen gas pressure reducer 71, the first proportional valve 72 and the second proportional valve 75 are controlled to set a leak detection pressure of a measured component, and a fuel cell stack leak is detected: firstly, opening a fourth electromagnetic valve 45, wherein the fourth electromagnetic valve 45 is a hydrogen cavity pile air inlet electromagnetic valve, then opening a fifth electromagnetic valve 46, the fifth electromagnetic valve 46 is an air cavity air inlet electromagnetic valve, then opening a sixth electromagnetic valve 47, the sixth electromagnetic valve 47 is a cooling cavity air inlet electromagnetic valve, adjusting a proportional valve to set a three-cavity total pressure value, then adjusting the proportional valve to close an air inlet air source, recording a pressure drop value after a certain time, and detecting pile leakage; opening a fourth electromagnetic valve 45, adjusting the proportional valve to set the pressure value of the hydrogen cavity, then adjusting the proportional valve to close the gas inlet source, recording the pressure drop value after a certain time, and detecting the leakage of the hydrogen cavity of the galvanic pile; opening a fourth electromagnetic valve 45, an eighth electromagnetic valve 53 and a second exhaust electromagnetic valve 511, wherein the eighth electromagnetic valve 53 is an air cavity outlet electromagnetic valve of the stack, a hydrogen cavity keeps a constant pressure value, and the numerical value of a second flowmeter 512 is observed after the hydrogen cavity is stabilized to detect the flow of the serial air cavity of the hydrogen cavity; open No. four solenoid valve 45, No. five solenoid valve 46, No. nine solenoid valve 54 and second exhaust solenoid valve 511, No. nine solenoid valve 54 is the cooling chamber solenoid valve of giving vent to anger, and hydrogen gas chamber and air chamber keep invariable pressure value, observe the numerical value of second flowmeter 512 after the stability, detect hydrogen gas chamber and air chamber cluster cooling chamber flow, other spare parts of detecting system leak: opening the first electromagnetic valve 42, adjusting the proportional valve to set a detection pressure value of the hydrogen circulating pump 48, then adjusting the proportional valve to close an air inlet source, recording a pressure drop value after a certain time, and detecting the leakage condition of the hydrogen circulating pump 48; opening a second electromagnetic valve 43 and a third electromagnetic valve 44, adjusting a proportional valve to set a pressure value detected by a gas humidifier 49, then adjusting the proportional valve to close an air inlet source, recording a pressure drop value after a certain time, and detecting the leakage condition of the gas humidifier 49; the detection of the self-control component 510, the gas separator 59 and the intercooler 58 can be performed according to the above steps, and if the flow values of the system components need to be directly fed back by the first flow meter 412 and the second flow meter 512, the internal volume space of the components need to be confirmed, and the pressure drop value is converted.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuel cell system part leakage detection device comprises a support box (1), an upper computer (2), a mounting plate (3), a first gas collection subassembly (4), a second gas collection subassembly (5), a fuel cell stack (6), a gas control subassembly (7) and a nitrogen gas cylinder (8), and is characterized in that the fuel cell stack (6) is fixedly mounted inside the support box (1), the upper computer (2) is fixedly mounted at the top of the support box (1), the mounting plate (3) is fixedly connected to one end of the top of the support box (1), a first gas collection subassembly (4) is arranged at one end, far away from the upper computer (2), of the outer side of the mounting plate (3), the first gas collection subassembly (4) comprises a first gas collection subassembly (41), and the first gas collection subassembly (41) is fixedly connected to one end, far away from the upper computer (2), of the outer side of the mounting plate (3), a first electromagnetic valve (42), a second electromagnetic valve (43), a third electromagnetic valve (44), a fourth electromagnetic valve (45), a fifth electromagnetic valve (46) and a sixth electromagnetic valve (47) are sequentially arranged on the outer side of the first gas collecting and distributing block (41), a hydrogen circulating pump (48) is arranged at one end, away from the first gas collecting and distributing block (41), of the first electromagnetic valve (42), a gas humidifier (49) is arranged between one ends, away from the first gas collecting and distributing block (41), of the second electromagnetic valve (43) and the third electromagnetic valve (44), a first exhaust electromagnetic valve (411) is arranged at one end of the first gas collecting and distributing block (41), a first flow meter (412) is arranged at one end, away from the first gas collecting and distributing block (41), of the outer side of the mounting plate (3), and a second gas collecting and distributing block (5) is arranged at one end, away from the first gas collecting and distributing block (4), a gas control assembly (7) is arranged between the first gas collector subassembly (4) and the second gas collector subassembly (5), and one end of the gas control assembly (7) is connected with a nitrogen cylinder (8) through a pipeline.

2. The fuel cell system component leakage detection device according to claim 1, wherein the second gas manifold assembly (5) comprises a second gas manifold block (51), a second gas manifold block (51) is fixedly mounted at one end of the outer side of the mounting plate (3) far away from the first gas manifold block (41), a seventh electromagnetic valve (52), an eighth electromagnetic valve (53), a ninth electromagnetic valve (54), a tenth electromagnetic valve (55), an eleventh electromagnetic valve (56) and a twelfth electromagnetic valve (57) are sequentially arranged at the outer side of the second gas manifold block (51), an intercooler (58) is arranged at one end of the tenth electromagnetic valve (55) far away from the second gas manifold block (51), a gas separator (59) is arranged at one end of the eleventh electromagnetic valve (56) far away from the second gas manifold block (51), and a self-control component (510) is arranged at one end of the twelfth electromagnetic valve (57) far away from the second gas manifold block (51) ) One end of the second gas collection and separation block (51) is provided with a second exhaust electromagnetic valve (511), and one end, away from the second gas collection and separation block (51), of the second exhaust electromagnetic valve (511) is provided with a second flow meter (512).

3. The fuel cell system component leakage detection device according to claim 2, wherein the gas control assembly (7) comprises a nitrogen pressure reducer (71), the nitrogen pressure reducer (71) is arranged between the first gas collection and separation block (41) and the second gas collection and separation block (51), a first proportional valve (72), a second pressure sensor (73) and a first mechanical pressure relief valve (74) are sequentially arranged between the nitrogen pressure reducer (71) and the second gas collection and separation block (51), and a second proportional valve (75), a third pressure sensor (76) and a second mechanical pressure relief valve (77) are sequentially arranged between the nitrogen pressure reducer (71) and the first gas collection and separation block (41).

4. The fuel cell system component leakage detection device according to claim 1, wherein a first pressure sensor (410) is arranged between each of the four-number solenoid valve (45), the five-number solenoid valve (46), the six-number solenoid valve (47) and the fuel cell stack (6).

5. A fuel cell system component leakage detecting device according to claim 3, wherein said nitrogen gas pressure reducer (71) is connected to a nitrogen gas cylinder (8) through a delivery pipe.

6. The fuel cell system component leakage detection device according to claim 3, wherein the first proportional valve (72), the second proportional valve (75), the second pressure sensor (73), the third pressure sensor (76), the first exhaust solenoid valve (411), the second exhaust solenoid valve (511), the first flow meter (412), the second flow meter (512), the first solenoid valve (42), the second solenoid valve (43), the third solenoid valve (44), the fourth solenoid valve (45), the fifth solenoid valve (46), the sixth solenoid valve (47), the first pressure sensor (410), the seventh solenoid valve (52), the eighth solenoid valve (53), the ninth solenoid valve (54), the tenth solenoid valve (55), the eleventh solenoid valve (56) and the twelfth solenoid valve (57) are electrically connected to the upper computer (2).

7. The fuel cell system component leakage detection device according to claim 3, wherein the ends of the fourth solenoid valve (45), the fifth solenoid valve (46) and the sixth solenoid valve (47) away from the first gas manifold block (41) are connected to the gas inlet end of the fuel cell stack (6), the ends of the seventh solenoid valve (52), the eighth solenoid valve (53) and the ninth solenoid valve (54) away from the second gas manifold block (51) are connected to the gas outlet end of the fuel cell stack (6), the fourth solenoid valve (45) is a hydrogen cavity stack gas inlet solenoid valve, the fifth solenoid valve (46) is an air cavity gas inlet solenoid valve, the sixth solenoid valve (47) is a cooling cavity solenoid valve, the seventh solenoid valve (52) is a hydrogen cavity stack gas outlet solenoid valve, and the eighth solenoid valve (53) is an air cavity gas outlet solenoid valve, and the nine-number electromagnetic valve (54) is a cooling cavity air outlet electromagnetic valve.