Airtightness detection pipeline structure of fuel cell engine system

Abstract

The utility model relates to the field of fuel cells, in particular to an air tightness detection pipeline structure of a fuel cell engine system. The device comprises a joint, a five-way joint and a return pipe structure, the joint is provided with an air inlet passage and an air outlet passage, two ends of the air inlet passage are respectively communicated with an air inlet pipe and an air delivery pipe, the joint is provided with a medium-pressure sensor for detecting air pressure of the air inlet passage, the air inlet passage of the joint is communicated with a pressure detection component, and the air delivery pipe is provided with a manual switch valve; the five-way connector is provided with an air inlet end, an air outlet end and three flow dividing ends, the air inlet end is communicated with the air conveying pipe, a proportional valve a is arranged at the air inlet end, the three flow dividing ends are respectively communicated with a throttle valve, the three throttle valves are respectively communicated with a throttle valve connector a and two throttle valve connectors b, the throttle valve connector a and the throttle valve connectors b are both communicated with pipe connectors, and the pipe connectors are communicated with the proportional valve a. The pipe joint communicates with a shunt pipe. The valve function and the air tightness of the fuel cell engine system can be accurately detected.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, in particular to an airtight detection pipeline structure for a fuel cell engine system. Background Art

[0002] At present, the hydrogen energy vehicle industry is developing rapidly. As a core product in the whole vehicle, the fuel cell engine system is crucial. Therefore, the production capacity of the fuel cell engine system has become the key to measuring the development of an enterprise, and the detection of the functions and performance of the engine system itself is a key factor affecting the production capacity. At present, there is a lack of technology for accurately detecting the valve function and airtightness of the fuel cell engine system. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the problems in the background art and propose an airtight detection pipeline structure for a fuel cell engine system that can accurately detect the valve function and airtightness of the fuel cell engine system.

[0004] The technical solution of the utility model is an airtight detection pipeline structure for a fuel cell engine system, which includes a joint, a five-way joint, and a return pipe structure; the joint has an air inlet passage and an air outlet passage, the two ends of the air inlet passage are respectively connected with an air inlet pipe and an air delivery pipe, a medium-pressure sensor for detecting the air pressure in the air inlet passage is arranged on the joint, the air inlet passage of the joint is connected with a pressure detection component, and a manual switch valve is arranged on the air delivery pipe; the five-way joint has an air inlet end, an air outlet end, and three shunt ends, the air inlet end is connected with the air delivery pipe, a proportional valve a is arranged at the air inlet end, each of the three shunt ends is connected with a throttle valve, each of the three throttle valves is connected with a throttle valve joint a and two throttle valve joints b, the throttle valve joint a and the throttle valve joints b are both connected with a pipe joint, the pipe joint is connected with a shunt pipe, and the shunt pipe is connected with the fuel cell engine system; the return pipe structure is connected with the air outlet end of the five-way joint.

[0005] Preferably, the pressure detection component includes a pressure gauge and a connecting pipe that connects the pressure gauge with the air inlet passage of the joint.

[0006] Preferably, a pressure sensor is arranged on the throttle valve joint a, the pipe joint corresponding to the throttle valve joint a is connected with a shunt pipe a, and the shunt pipe a is connected with the hydrogen system of the fuel cell engine system; the two pipe joints corresponding to the two throttle valve joints b are respectively connected with a shunt pipe b and a shunt pipe c, the shunt pipe b is connected with the air system of the fuel cell engine system, and the shunt pipe c is connected with the thermal management system of the fuel cell engine system.

[0007] Preferably, the reflux pipe structure includes a three-way joint, a reflux pipe connected between the air outlet end of the five-way joint and one end of the three-way joint, a connecting pipe a and a connecting pipe b respectively connected to the other two ends of the three-way joint, a confluence pipe having two air inlets and one air outlet, a proportional valve b provided between the connecting pipe a and one air inlet of the confluence pipe, and a shut-off valve provided between the connecting pipe b and the other air inlet of the confluence pipe.

[0008] Preferably, the air outlet of the confluence pipe is connected to one end of the air outlet passage of the joint, and the other end of the air outlet passage is connected with an air outlet pipe.

[0009] Compared with the prior art, the utility model has the following beneficial technical effects:

[0010] The utility model can accurately detect the valve function and air tightness before the fuel cell engine system leaves the factory. The whole pipeline has good sealing performance, high detection efficiency and safe detection process. After the air tightness detection is completed, the pressure relief operation is carried out again through the throttle valve and the proportional valve to complete the air tightness detection process. The set pressure gauge, medium pressure sensor and pressure sensor can detect the corresponding gas pressure at each place, avoiding irreversible damage to the hydrogen fuel cell engine system caused by excessive gas pressure. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0012] Reference numerals: 1, air inlet pipe; 2, joint; 3, pressure gauge; 31, connecting pipe; 4, medium pressure sensor; 5, air outlet pipe; 6, gas transmission pipe; 7, manual switch valve; 8, five-way joint; 81, cover plate; 9, proportional valve a; 10, throttle valve; 11, throttle joint a; 12, pressure sensor; 13, throttle joint b; 14, pipe joint; 15, shunt pipe a; 16, shunt pipe b; 17, shunt pipe c; 18, reflux pipe; 19, three-way joint; 20, connecting pipe a; 21, proportional valve b; 22, connecting pipe b; 23, shut-off valve; 24, confluence pipe. Detailed Embodiment

[0013] As Figure 1 shown, a fuel cell engine system air tightness detection pipeline structure proposed in this embodiment includes a joint 2, a five-way joint 8 and a reflux pipe structure.

[0014] The joint 2 has an air inlet passage and an air outlet passage. The two ends of the air inlet passage are respectively connected with an air inlet pipe 1 and a gas transmission pipe 6, and the air inlet pipe 1 is connected with an external gas source. A medium pressure sensor 4 for detecting the air pressure of the air inlet passage is arranged on the joint 2, and the air inlet passage of the joint 2 is connected with a pressure gauge 3 through a connecting pipe 31. A manual switch valve 7 is arranged on the gas transmission pipe 6, and the on-off of the gas transmission passage of the gas transmission pipe 6 is controlled by manually operating the manual switch valve 7.

[0015] The five-way joint 8 is connected with a cover plate 81 on the side. The five-way joint 8 has an air inlet end, an air outlet end and three shunt ends. The air inlet end is communicated with the air delivery pipe 6, and a proportional valve a9 is arranged at the air inlet end. Each of the three shunt ends is communicated with a throttle valve 10. Each of the three throttle valves 10 is communicated with a throttle joint a11 and two throttle joints b13. The throttle joint is connected with the throttle valve 10 by an M6 hexagon flange bolt and sealed with an O-ring. Both the throttle joint a11 and the throttle joint b13 are communicated with a pipe joint 14. There are a total of three pipe joints 14. The pipe joint 14 is communicated with a shunt pipe, and the shunt pipe is communicated with the fuel cell engine system.

[0016] A pressure sensor 12 is arranged on the throttle joint a11. The gas pressure entering the fuel cell engine system can be accurately controlled through the proportional valve a9, the throttle valve 10 and the pressure sensor 12. The pipe joint 14 corresponding to the throttle joint a11 is communicated with a shunt pipe a15, and the shunt pipe a15 is communicated with the hydrogen system of the fuel cell engine system; the two pipe joints 14 corresponding to the two throttle joints b13 are respectively communicated with a shunt pipe b16 and a shunt pipe c17. The shunt pipe b16 is communicated with the air system of the fuel cell engine system, and the shunt pipe c17 is communicated with the thermal management system of the fuel cell engine system. Pipe joints 14 with the same specifications are respectively reserved in the hydrogen system, the air system and the thermal management system of the fuel cell engine system. The pipe joint 14 is an existing quick-connect joint.

[0017] The return pipe structure includes a three-way joint 19, a return pipe 18 communicated between the air outlet end of the five-way joint 8 and one end of the three-way joint 19, a connecting pipe a20 and a connecting pipe b22 respectively communicated with the other two ends of the three-way joint 19, a confluence pipe 24 having two air inlets and one air outlet, a proportional valve b21 arranged between the connecting pipe a20 and one air inlet of the confluence pipe 24, and a shut-off valve 23 arranged between the connecting pipe b22 and the other air inlet of the confluence pipe 24. The air outlet of the confluence pipe 24 is communicated with one end of the air outlet passage of the joint 2, and the other end of the air outlet passage is communicated with an air delivery pipe 5.

[0018] In the above structure, the air inlet pipe 1, the air delivery pipe 5, the air delivery pipe 6, the connecting pipe a20, the connecting pipe b22 and the confluence pipe 24 are all made of stainless steel seamless steel pipes. The ends of the stainless steel seamless steel pipes are communicated with other structures through ferrule joints. The shunt pipe a15, the shunt pipe b16 and the shunt pipe c17 are all made of metal braided mesh steel pipes.

[0019] Working principle: During airtightness detection, close the proportional valve b21 and the shut-off valve 23, and open the manual switch valve 7. The external air source enters the air intake passage of the joint 2 through the intake pipe 1. The pressure gauge 3 and the medium-pressure sensor 4 detect the gas pressure in the air intake passage. The gas enters the five-way joint 8 through the gas transmission pipe 6 and the manual switch valve 7. The pressure of the compressed air is regulated by the proportional valve a9, and the gas pressure entering the fuel cell engine system is monitored by the pressure sensor 12 to ensure that it does not exceed the tolerance limit of the fuel cell engine system. After the pressure reaches the airtightness test condition, close the three throttle valves 10, keep the pressure, and perform airtightness detection on the fuel cell engine system. After the detection is completed, open the three throttle valves 10 and open the proportional valve b21 to discharge the compressed air in the fuel cell engine system through the return pipe 18, the connecting pipe a20, the proportional valve b21, the manifold 24, the air outlet passage of the joint 2, and the outlet pipe 5; if the proportional valve b21 fails, open the shut-off valve 23 to discharge the compressed air through the return pipe 18, the connecting pipe b22, the shut-off valve 23, the manifold 24, the air outlet passage of the joint 2, and the outlet pipe 5 for emergency pressure relief.

[0020] This embodiment can accurately detect the valve function and airtightness of the fuel cell engine system before leaving the factory. The sealing performance of the entire pipeline is good, the detection efficiency is high, and the detection process is safe. By integrating proportional valves and throttle valves to control the external air source entering the fuel cell engine system and keeping the pressure, airtightness detection can be carried out on the entire fuel cell engine system. After the airtightness detection is completed, the pressure is relieved again through the throttle valve and the proportional valve to complete the airtightness detection process. At the same time, the shut-off valve 23 is integrated, and when the proportional valve b21 fails, the pressure can be relieved through the shut-off valve 23. The set pressure gauge 3, medium-pressure sensor 4, and pressure sensor 12 can detect the corresponding gas pressure at each place to avoid irreversible damage to the hydrogen fuel cell engine system caused by excessive gas pressure.

[0021] The above has described the embodiments of the present invention in detail in conjunction with the accompanying drawings. However, the present invention is not limited to this. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the relevant technical field.

Claims

1. A fuel cell engine system airtightness detection pipeline structure, characterized in that: include: A connector (2) having an air inlet passage and an air outlet passage, the two ends of the air inlet passage being connected to an air inlet pipe (1) and an air delivery pipe (6) respectively, a medium pressure sensor (4) for detecting the air pressure of the air inlet passage being arranged on the connector (2), the air inlet passage of the connector (2) being connected to a pressure detection component, and a manual switch valve (7) being arranged on the air delivery pipe (6); A five-way joint (8) having an air inlet end, an air outlet end and three flow-dividing ends, the air inlet end being connected to an air delivery pipe (6), a proportional valve a (9) being arranged at the air inlet end, the three flow-dividing ends being connected to a throttle valve (10) respectively, the three throttle valves (10) being connected to a throttle valve joint a (11) and two throttle valve joints b (13) respectively, the throttle valve joint a (11) and the throttle valve joint b (13) being connected to a pipe joint (14), the pipe joint (14) being connected to a flow-dividing pipe, and the flow-dividing pipe being connected to a fuel cell engine system; The return pipe structure is communicated with the air outlet end of the five-way joint (8).

2. The fuel cell engine system airtightness detection pipeline structure according to claim 1, characterized in that: The pressure detection assembly comprises a pressure gauge (3) and a connecting pipe (31) connecting the pressure gauge (3) with an air intake passage of a joint (2).

3. The fuel cell engine system airtightness detection pipeline structure according to claim 2, characterized in that: A pressure sensor (12) is provided on the throttle joint a (11); a pipe joint (14) corresponding to the throttle joint a (11) is connected to a shunt pipe a (15); the shunt pipe a (15) is connected to a hydrogen system of a fuel cell engine system; two pipe joints (14) corresponding to the two throttle joints b (13) are respectively connected to a shunt pipe b (16) and a shunt pipe c (17); the shunt pipe b (16) is connected to an air system of the fuel cell engine system; and the shunt pipe c (17) is connected to a thermal management system of the fuel cell engine system.

4. The fuel cell engine system airtightness detection pipeline structure according to claim 3, characterized in that: The return pipe structure comprises a three-way joint (19), a return pipe (18) connected between the gas outlet end of the five-way joint (8) and one end of the three-way joint (19), a connecting pipe a (20) and a connecting pipe b (22) respectively connected to the other two ends of the three-way joint (19), a manifold (24) having two gas inlets and one gas outlet, a proportional valve b (21) arranged between the connecting pipe a (20) and one gas inlet of the manifold (24), and a shut-off valve (23) arranged between the connecting pipe b (22) and the other gas inlet of the manifold (24).

5. The fuel cell engine system airtightness detection pipeline structure according to claim 4, characterized in that: The air outlet of the confluence pipe (24) is connected to one end of the air outlet passage of the joint (2), and the other end of the air outlet passage is connected to the air outlet pipe (5).

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