System for detecting single hydrogen injection amount of hydrogen injector

Abstract

The invention belongs to the technical field of test equipment, and discloses a system for detecting the single hydrogen injection amount of a hydrogen injector, the system comprises a test tool, a hydrogen collector, an oil tank and a flow meter assembly, the test tool is provided with a gas inlet and an injection orifice, the gas inlet and the injection orifice are respectively used for communicating with the gas inlet end and the injection end of the hydrogen injector, and the flow meter assembly is used for detecting the single hydrogen injection amount of the hydrogen injector. The hydrogen collector is communicated with a gas supply pipe and an exhaust pipe, the gas supply pipe is communicated with the jet orifice and is provided with a first switch valve, the exhaust pipe is provided with a second switch valve, the oil tank is communicated with the hydrogen collector through an oil supply pipe, and the oil supply pipe is provided with an oil pump; the position sensor is used for detecting the position of the piston, the piston and the cylinder jointly form an oil cavity, the hydrogen collector communicates with the oil cavity through a conveying pipe, and a third switch valve is arranged on the conveying pipe. The system for detecting the single hydrogen injection amount of the hydrogen injector can accurately and reliably detect the gas volume flow of single hydrogen injection in the working process of the hydrogen injector.

Description

Technical Field

[0001] The invention relates to the technical field of testing equipment, and in particular to a system for detecting the single hydrogen injection amount of a hydrogen injector. Background Art

[0002] At present, hydrogen energy has two major categories: fuel cells and hydrogen engines. Both types of products require the use of hydrogen injectors, whose function is to provide hydrogen to the system on demand under the drive of the injector controller.

[0003] In the fuel-electric system, hydrogen is supplied to the exchange membrane, and in the hydrogen engine, hydrogen is supplied to the cylinder for combustion. When the hydrogen injector is working, it outputs hydrogen in pulses (non-continuous output). Taking the hydrogen engine as an example, it outputs 300-2500 times per minute. The single output volume is determined by the working conditions, about 20-90 mg each time. Like the gasoline or diesel injectors of traditional internal combustion engines, the single hydrogen injection volume of the hydrogen injector is a very important performance indicator and needs to be precisely controlled. During the research and development and production process, it is necessary to accurately measure the single hydrogen injection volume, that is, the gas volume flow rate of a single hydrogen injection.

[0004] In the prior art, the volume flow rate of gas can be measured by a gear / turbine volume flow meter, but this solution is only applicable to the continuous gas flow and cannot measure the single injection amount under high-frequency pulse injection conditions. Therefore, how to detect the gas volume flow rate of a single hydrogen injection during the pulse hydrogen injection process of a hydrogen injector has become the direction of efforts of technicians in the field. Summary of the invention

[0005] The object of the present invention is to provide a system for detecting the single hydrogen injection amount of a hydrogen injector, which can accurately and reliably detect the gas volume flow rate of a single hydrogen injection during the operation of the hydrogen injector.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The system for detecting the single injection amount of hydrogen from a hydrogen injector comprises:

[0008] A test fixture, used for installing a hydrogen injector, the test fixture is provided with an air inlet and an injection port, the air inlet is used to connect to the air inlet end of the hydrogen injector, and the injection port is used to connect to the injection end of the hydrogen injector;

[0009] A hydrogen collector is connected with a gas supply pipe and an exhaust pipe, the gas supply pipe is connected with the injection port, a first switch valve is arranged on the gas supply pipe, a second switch valve is arranged on the exhaust pipe, and the exhaust pipe is used to discharge the hydrogen in the hydrogen collector;

[0010] An oil tank is connected to the hydrogen collector through an oil supply pipe, and an oil pump is provided on the oil supply pipe;

[0011] The flow meter assembly includes a cylinder, a piston and a position sensor. The piston is retractably arranged in the cylinder. The position sensor is used to detect the position of the piston. The piston and the cylinder together form an oil chamber. The hydrogen collector is connected to the oil chamber through a delivery pipe. A third switch valve is provided on the delivery pipe.

[0012] Preferably, the external air source is connected to the air inlet via a supply pipe, and a pressure gauge is provided on the air supply pipe.

[0013] Preferably, a filter is provided on the supply pipe.

[0014] Preferably, the flow meter assembly further comprises a telescopic drive member for driving the piston to extend and retract.

[0015] Preferably, the flow meter assembly further comprises a pressure sensor, and the pressure sensor is used to measure the pressure of the oil chamber.

[0016] Preferably, an exhaust port is provided above the oil tank, and one end of the exhaust pipe away from the hydrogen collector is connected to the oil tank and to the exhaust port.

[0017] Preferably, the cylinder is connected to a connecting pipe, a first end of the connecting pipe is connected to the oil chamber, and a second end of the connecting pipe is connected to the oil tank.

[0018] Preferably, a first one-way valve is provided on the connecting pipe, and the first one-way valve is configured to conduct one-way from the oil chamber to the oil tank.

[0019] Preferably, a second one-way valve is provided on the oil supply pipe, and the second one-way valve is configured to conduct one-way from the oil tank to the hydrogen collector.

[0020] Preferably, an accumulator is provided on the delivery pipe.

[0021] Beneficial effects:

[0022] The system for detecting the single hydrogen injection amount of a hydrogen injector provided by the present invention is used to place the hydrogen injector to be tested in a test fixture, and the air inlet and the injection port are respectively connected to the air inlet end and the injection end of the hydrogen injector. Before the test, the first valve and the third valve are closed, and the second valve is opened. The oil pump is operated to pass the oil in the oil tank into the hydrogen collector through the oil supply pipe to fill the hydrogen collector with oil, and the piston of the flow meter assembly is moved downward to the limit position, that is, to the minimum position of the oil chamber. In this process, if there is residual hydrogen in the hydrogen collector, as the oil is gradually filled, the residual hydrogen will move to the exhaust pipe and be discharged. When the oil in the hydrogen collector is full and there is no residual hydrogen, the test can be carried out. The second valve is closed, the first valve and the third valve are opened, the air inlet is connected to the external gas source, the hydrogen injector is working, and the hydrogen is injected into the hydrogen collector through the air supply pipe. The hydrogen enters the hydrogen collector and can push part of the oil in the hydrogen collector into the oil chamber through the delivery pipe, and then lift the piston upward for a certain distance. During the process, the position sensor records the distance the piston moves upward, and calculates the volume of oil corresponding to a single hydrogen injection based on the cylinder size and piston size. Because the entire test circuit is closed, the volume of oil corresponding to a single hydrogen injection is the hydrogen volume flow rate of a single hydrogen injection of the hydrogen injector. The application of this system can accurately and reliably detect the gas volume flow rate of a single hydrogen injection during the operation of the hydrogen injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a system for detecting a single hydrogen injection amount of a hydrogen injector provided by the present invention.

[0024] In the figure:

[0025] 1. Test tooling;

[0026] 2. Hydrogen collector; 21. Gas supply pipe; 22. Exhaust pipe; 23. Oil supply pipe; 231. Oil pump; 232. Second one-way valve; 24. Delivery pipe; 241. Accumulator; 25. Connecting pipe; 251. First one-way valve;

[0027] 31. First switch valve; 32. Second switch valve; 33. Third switch valve;

[0028] 4. Fuel tank; 41. Exhaust port;

[0029] 5. Flow meter assembly; 51. Cylinder; 511. Oil chamber; 52. Piston; 53. Position sensor; 54. Telescopic drive member; 55. Pressure sensor;

[0030] 61. External gas source; 62. Supply pipe; 63. Pressure gauge; 64. Filter element;

[0031] 7. Controller;

[0032] 8. Hydrogen injector. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] This embodiment provides a system for detecting the amount of hydrogen injected by a hydrogen injector in a single injection. Figure 1As shown, the system for detecting the single hydrogen injection amount of the hydrogen injector includes a test fixture 1, a hydrogen collector 2, a fuel tank 4 and a flow meter assembly 5. The test fixture 1 is used to install the hydrogen injector 8. The test fixture 1 is provided with an air inlet and an injection port. The air inlet is used to connect to the air inlet end of the hydrogen injector 8, and the injection port is used to connect to the injection end of the hydrogen injector 8. The hydrogen collector 2 is connected with a gas supply pipe 21 and an exhaust pipe 22. The gas supply pipe 21 is connected to the injection port. The gas supply pipe 21 is provided with a first switch valve 31. The exhaust pipe 22 is provided with a second switch valve 32. The exhaust pipe 22 is used to discharge the hydrogen in the hydrogen collector 2. The fuel tank 4 is connected to the hydrogen collector 2 through an oil supply pipe 23. The oil supply pipe 23 is provided with an oil pump 231. The flow meter assembly 5 includes a cylinder 51, a piston 52 and a position sensor 53. The piston 52 is retractably arranged in the cylinder 51. The position sensor 53 is used to detect the position of the piston 52. The piston 52 and the cylinder 51 together form an oil chamber 511. The hydrogen collector 2 is connected to the oil chamber 511 through a delivery pipe 24. A third switch valve 33 is provided on the delivery pipe 24.

[0038] In this embodiment, the hydrogen injector 8 to be tested is placed in the test fixture 1 during use, and the air inlet and the injection port are connected to the air inlet end and the injection end of the hydrogen injector 8, respectively. Before the test, the first valve and the third valve are closed, and the second valve is opened. The oil pump 231 is operated to pass the oil in the oil tank 4 into the hydrogen collector 2 through the oil supply pipe 23 to fill the hydrogen collector 2 with oil, and the piston 52 of the flow meter assembly 5 is moved downward to the limit position, that is, to the minimum position of the oil chamber 511. In this process, if there is residual hydrogen in the hydrogen collector 2, as the oil is gradually filled, the residual hydrogen will move to the exhaust pipe 22 and be discharged. When the oil in the hydrogen collector 2 is full and there is no residual hydrogen, the test can be carried out, the second valve is closed, the first valve and the third valve are opened, the air inlet is connected to the external gas source 61, the hydrogen injector 8 is working, and the hydrogen is injected into the hydrogen collector 2 through the gas supply pipe 21. The hydrogen enters the hydrogen collector 2 and can push part of the oil in the hydrogen collector 2 into the oil chamber 511 through the delivery pipe 24, and then lift the piston 52 upward for a certain distance. During the process, the position sensor 53 records the distance that the piston 52 moves upward, and calculates the volume of oil corresponding to a single hydrogen injection according to the size of the cylinder 51 and the size of the piston 52. Because the entire test loop is closed, the volume of oil corresponding to a single hydrogen injection is the hydrogen volume flow rate of a single hydrogen injection of the hydrogen injector 8. The application of this system can accurately and reliably detect the gas volume flow rate of a single hydrogen injection during the operation of the hydrogen injector 8.

[0039] In this embodiment, the hydrogen collector 2 is configured as a sealed container.

[0040] In this embodiment, the system for detecting the single hydrogen injection amount of the hydrogen injector includes a controller 7. The controller 7 can be connected to the hydrogen injector 8 for communication, and the controller 7 is connected to the PLC for communication via a cable. The PLC controls the hydrogen injector 8 to perform the injection operation by sending instructions to the controller 7.

[0041] Specifically, a placement groove is provided on the test fixture 1, and the air inlet and the injection port are both connected to the placement groove. The hydrogen injector 8 can be placed in the placement groove.

[0042] In this embodiment, the external gas source 61 is connected to the gas inlet through a supply pipe 62, and a pressure gauge 63 is provided on the supply pipe 62. The pressure gauge 63 is used to detect the pressure of the hydrogen flowing in the supply pipe 62 to ensure that the gas supply pressure is within a set range.

[0043] In this embodiment, a filter 64 is provided on the supply pipe 62. Specifically, the pressure gauge 63 and the filter 64 are sequentially arranged along the flow direction of the hydrogen. The arrangement of the filter 64 can filter out impurities in the supplied hydrogen to ensure the purity of the hydrogen supply.

[0044] In this embodiment, the flow meter assembly 5 further includes a pressure sensor 55, which is used to measure the pressure of the oil chamber 511. During the test, the position of the piston 52 can be controlled according to the pressure of the oil chamber 511 collected by the pressure sensor 55 to ensure that the pressure of the oil chamber 511 is within a set range. Since the oil chamber 511 and the hydrogen collector 2 are connected during the test, it can also ensure that the hydrogen in the hydrogen collector 2 is constant at night.

[0045] In this embodiment, the flow meter assembly 5 also includes a telescopic drive member 54 for driving the piston 52 to extend and retract. By setting the telescopic drive member 54, the extension and retraction of the piston 52 can be automatically controlled. Optionally, the telescopic drive member 54 can be a linear servo module, a telescopic cylinder, or an electric push rod, which is not limited too much here. Taking the telescopic drive member 54 as an electric push rod as an example, the electric push rod includes a fixed rod and a telescopic rod, the fixed rod is fixed to the cylinder 51, the telescopic rod is connected to the piston 52 through the piston rod, and the telescopic rod is extended and retracted relative to the fixed rod, which can drive the piston 52 to extend and retract in the cylinder 51.

[0046] In this embodiment, an exhaust port 41 is provided above the fuel tank 4, and one end of the exhaust pipe 22 away from the hydrogen collector 2 is connected to the fuel tank 4 and the exhaust port 41. The hydrogen in the hydrogen collector 2 is first introduced into the fuel tank 4 through the exhaust pipe 22 during the exhaust process, and then discharged through the exhaust port 41.

[0047] In this embodiment, the cylinder 51 is connected to a connecting pipe 25, a first end of the connecting pipe 25 is connected to the oil chamber 511, and a second end of the connecting pipe 25 is connected to the oil tank 4. Specifically, by providing the connecting pipe 25, when the test is completed, the control piston 52 moves downward, which can squeeze the oil in the oil chamber 511, so that this part of the oil returns to the oil tank 4 through the bypass pipe.

[0048] In this embodiment, the connecting pipe 25 is provided with a first one-way valve 251, and the first one-way valve 251 is configured to conduct one-way flow from the oil chamber 511 to the oil tank 4. By providing the first one-way valve 251, the oil in the connecting pipe 25 is strictly conducted one-way from the oil chamber 511 to the oil tank 4, thereby preventing the oil in the connecting pipe 25 from flowing back.

[0049] In this embodiment, a second one-way valve 232 is provided on the oil supply pipe 23, and the second one-way valve 232 is configured to conduct one-way flow from the oil tank 4 to the hydrogen collector 2. By providing the second one-way valve 232, the oil in the oil supply pipe 23 is strictly conducted one-way from the oil tank 4 to the hydrogen collector 2, thereby preventing the oil in the oil supply pipe 23 from flowing back.

[0050] In this embodiment, an accumulator 241 is provided on the delivery pipe 24. The accumulator 241 is an energy storage device in the hydraulic and pneumatic system. It converts the energy in the system into compression energy or potential energy and stores it at an appropriate time. When the system needs it, it converts the compression energy or potential energy into hydraulic or gas pressure energy and releases it to replenish the system. When the system pressure increases instantaneously, the accumulator 241 can absorb this part of the energy to ensure that the pressure of the entire system is normal.

[0051] In summary, the system for detecting the single hydrogen injection amount of a hydrogen injector provided in this embodiment has a simple structure and strong applicability, and can measure the volume flow rate of a single injection of the hydrogen injector 8 under high-frequency pulse injection conditions.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A system for detecting the amount of hydrogen injected by a hydrogen injector at a single time, characterized in that: include: A test fixture (1) is used to install a hydrogen injector (8), the test fixture (1) is provided with an air inlet and an injection port, the air inlet is used to connect to the air inlet end of the hydrogen injector (8), and the injection port is used to connect to the injection end of the hydrogen injector (8); The hydrogen collector (2) is provided with a gas supply pipe (21) and an exhaust pipe (22) in communication, the gas supply pipe (21) being connected to the injection port, the gas supply pipe (21) being provided with a first switch valve (31), the exhaust pipe (22) being provided with a second switch valve (32), and the exhaust pipe (22) being used to discharge hydrogen in the hydrogen collector (2); An oil tank (4) is connected to the hydrogen collector (2) via an oil supply pipe (23), and an oil pump (231) is provided on the oil supply pipe (23); The flow meter assembly (5) comprises a cylinder (51), a piston (52) and a position sensor (53); the piston (52) is telescopically arranged in the cylinder (51); the position sensor (53) is used to detect the position of the piston (52); the piston (52) and the cylinder (51) together form an oil chamber (511); the hydrogen collector (2) is connected to the oil chamber (511) via a delivery pipe (24); and a third switch valve (33) is provided on the delivery pipe (24).

2. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: The external air source (61) is connected to the air inlet via a supply pipe (62), and a pressure gauge (63) is provided on the air supply pipe (62).

3. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 2, characterized in that: The supply pipe (62) is provided with a filter element (64).

4. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: The flow meter assembly (5) further comprises a telescopic driving member (54) for driving the piston (52) to telescope.

5. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: The flow meter assembly (5) further comprises a pressure sensor (55), wherein the pressure sensor (55) is used to measure the pressure of the oil chamber (511).

6. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: An exhaust port (41) is provided above the oil tank (4), and one end of the exhaust pipe (22) away from the hydrogen collector (2) is connected to the oil tank (4) and to the exhaust port (41).

7. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: The cylinder barrel (51) is connected to a connecting pipe (25), a first end of the connecting pipe (25) is connected to the oil chamber (511), and a second end of the connecting pipe (25) is connected to the oil tank (4).

8. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 7, characterized in that: The connecting pipe (25) is provided with a first one-way valve (251), and the first one-way valve (251) is configured to conduct one-way communication from the oil chamber (511) to the oil tank (4).

9. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: The oil supply pipe (23) is provided with a second one-way valve (232), and the second one-way valve (232) is configured to conduct one-way from the oil tank (4) to the hydrogen collector (2).

10. The system for detecting the single hydrogen injection amount of a hydrogen injector according to claim 1, characterized in that: An accumulator (241) is provided on the delivery pipe (24).

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