CN115389195A - Performance testing device for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle - Google Patents
Performance testing device for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle Download PDFInfo
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Abstract
The scheme provides a performance testing device for vehicle-mounted high-pressure valves of a hydrogen fuel cell vehicle, which comprises a pressurization module, a testing module, a high-low temperature module, a medium recycling module and a control module. The high-pressure medium gas is provided by the pressurization module, the medium gas passes through the pressure setting unit and the flow control unit of the test module to realize the control of the pressure, the on-off state, the cycle (duration) time cycle times or the flow parameters after the valve of the medium gas, and then is output to the high-pressure valve piece to be tested in the high-low temperature module, and the medium gas is monitored by the flow control unit and various transmitters by the high-pressure valve piece and then is connected with the inlet of the medium recovery module, thereby realizing the acquisition, storage and automatic analysis of the test process and the test data. The medium recycling module re-sets the medium gas behind the valve of the high-pressure valve to be tested and outputs the medium gas to the pressurization module, so that the medium gas is recycled, and the reliability and durability of the high-pressure valve can be verified with long service life and low cost.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a performance testing device for a vehicle-mounted high-pressure valve of a hydrogen fuel cell vehicle.
Background
Hydrogen fuel cell vehicles are an important aspect of hydrogen energy applications and are considered to be one of the new energy development paths with the most potential development at present. The physical and chemical properties of hydrogen are special, the performance requirements on various high-pressure valves (hydrogen valves for short) using hydrogen media are far higher than those of traditional valves, and in view of the situations that the industry is newer and various standards and specifications are not sound, how to open and close the hydrogen valves based on application conditions and necessary verification is the problem which must be solved at present.
Therefore, how to overcome the above technical drawbacks is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a performance testing device for a vehicle-mounted high-pressure valve of a hydrogen fuel cell vehicle, which can verify the reliability and durability of a hydrogen valve with long service life and low cost.
In order to solve the above technical problem, the present invention provides a performance testing apparatus for vehicle-mounted high-pressure valve of a hydrogen fuel cell vehicle, which is used for performing performance testing on the high-pressure valve, and comprises:
the pressurization module is used for pressurizing the medium gas;
the test module comprises a pressure setting unit and a control unit and is used for adjusting the pressure of the medium gas and controlling the on-off state, the cycle time, the cycle times or the flow after the valve of the medium gas in the test process;
the high and low temperature module is used for providing high and low temperature load for the high-pressure valve;
the medium recovery module is used for recovering medium gas and performing pressure adjustment and buffering;
the control module is used for controlling the opening and closing of the control parts of the test module and the high-low temperature module and analyzing the parameters of the high-pressure valve;
the high-pressure valve is arranged in the inner cavity of the high-low temperature module, the outlet of the pressurization module is communicated with the inlet of the test module, the outlet of the test module is communicated with the inlet of the high-pressure valve through the high-low temperature module, the outlet of the high-pressure valve is communicated with the inlet of the medium recovery module through the high-low temperature module, and the outlet of the medium recovery module is communicated with the inlet of the pressurization module.
Optionally, in the performance testing apparatus for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle,
the leakage detection module is used for detecting whether the medium gas in the high-pressure valve member leaks or not.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the high-pressure and low-temperature testing device is characterized by further comprising an explosion-proof tool arranged in the high-low temperature module, wherein an inner cavity of the explosion-proof tool is used for accommodating the high-pressure valve, the explosion-proof tool is provided with a plurality of interfaces used for being communicated with the outside, and an inlet and an outlet of the high-pressure valve are communicated with the testing module through the interfaces of the explosion-proof tool;
the leak detection module includes:
the vacuum pump is used for vacuumizing the explosion-proof tool;
the helium detector is used for capturing whether medium gas is generated in the explosion-proof tool;
and the mass spectrometer is used for counting and quantitatively measuring the medium leakage rate of the helium detector.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the explosion-proof tool comprises an upper cover and a base which are connected with each other, a sealing ring is arranged between the upper cover and a contact surface of the base, the upper cover is in a dome shape, and the wall thickness of the upper cover is larger than that of the base.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the high-low temperature module comprises a high-low temperature test box, the high-pressure valve piece is arranged in the high-low temperature test box, the high-pressure valve piece is communicated with the test module sequentially through the explosion-proof tool and the pipeline, and the pipeline penetrates through the high-low temperature test box.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the leak detection module includes:
the bubble cup is used for placing the interface of the high-pressure valve;
and the counter is used for counting the number of the bubbles leaked by the high-pressure valve piece through the infrared signal so as to realize qualitative measurement of the leakage rate of the valve.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the booster module includes booster pump and buffer tank, the entry of booster pump is used for letting in medium gas, the export of booster pump with the entry intercommunication of buffer tank, the export of buffer tank with test module's entry intercommunication.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the booster pump at least comprises a first booster pump and a second booster pump which are mutually connected in series.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the pressurizing module further comprises a first cooler arranged between the first booster pump and the second booster pump, and a second cooler arranged between the second booster pump and the buffer tank, wherein the air inlet of the first cooler is communicated with the driving air through the air inlet of the second cooler.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the medium recycling module comprises a buffer tank and a third booster pump, and the output pressure of the third booster pump is in the optimal working pressure interval of the booster pump of the booster module.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the medium recovery module further comprises a flow and back pressure monitoring module used for controlling the starting time of the third booster pump and the coordination of the upstream flow and the downstream flow and the pressure.
Optionally, in the performance testing apparatus for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle,
the control unit of the test module comprises a flow monitoring device and a temperature and pressure monitoring device, the pressure setting unit comprises a main pressure regulating valve, an inlet of the main pressure regulating valve is communicated with an outlet of the pressurization module, an outlet of the main pressure regulating valve is communicated with an inlet of a high-pressure valve, an outlet of the high-pressure valve is communicated with the flow monitoring device and an inlet of the medium recovery module respectively, and the temperature and pressure monitoring device is arranged between the main pressure regulating valve and the high-pressure valve.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
a first actuator is connected in series between the main pressure regulating valve and the high-pressure valve, a second actuator, a third actuator and a fourth actuator are respectively arranged at the downstream of the warm-pressure monitoring device, the downstream of the high-pressure valve and the downstream of the flow monitoring device, and the first actuator, the second actuator, the third actuator and the fourth actuator are all pneumatic valves;
the control unit further comprises an electric controller used for respectively controlling the pressure setting unit, the first actuator, the second actuator, the third actuator and the fourth actuator, the electric controller is used for starting the opening and closing of a valve rod or a valve through driving air, and the electric controller, the temperature and pressure monitoring device and the flow monitoring device are respectively and electrically connected with the control module or in signal connection with the control module.
Optionally, in the performance testing device for vehicle-mounted high-pressure valve member of hydrogen fuel cell vehicle,
the flow monitoring device comprises a front pneumatic valve, a flow meter, an electromagnetic valve, a Laval nozzle, a rear pneumatic valve and a flow monitoring controller, wherein the front pneumatic valve, the flow meter and the rear pneumatic valve are sequentially connected in series, and the flow monitoring controller is used for controlling the front pneumatic valve, the flow meter and the electromagnetic valve.
The performance testing device for the vehicle-mounted high-pressure valve of the hydrogen fuel cell automobile has the beneficial effects that:
the pressure of the medium gas, the on-off state, the circulation (duration) time circulation times or the flow parameters after the valve are controlled by the medium gas provided by the pressurizing module through the pressure setting unit and the flow control unit of the testing module, and then the medium gas is output to the high-pressure valve piece to be tested in the high-low temperature module, and the medium gas is monitored by the high-pressure valve piece through the flow control unit and various transmitters and then is connected with the inlet of the medium recovery module, so that the collection, storage and automatic analysis of the testing process and the testing data are realized. The medium recycling module re-sets the medium gas behind the valve of the high-pressure valve to be tested and outputs the medium gas to the pressurization module, so that the medium gas is recycled, and the reliability and durability of the high-pressure valve can be verified with long service life and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic connection diagram of a device for testing the performance of a vehicle-mounted high-pressure valve of a hydrogen fuel cell vehicle according to the present invention;
FIG. 2 is a schematic diagram of a connection relationship of a boosting module according to the present invention;
FIG. 3 is a schematic diagram of a connection relationship of test modules provided in the present invention;
FIG. 4 is a schematic structural view of an explosion-proof fixture provided by the invention;
fig. 5 is a schematic structural diagram of a flow monitoring device provided in the present invention.
In the upper diagram:
s-a high pressure valve member;
100-a boost module; 110-a first booster pump; 120-a second booster pump; 130-a buffer tank; 140-a first cooler; 150-a second cooler; 160-first temperature and pressure protection device; 170-second temperature and pressure protection devices;
200-a test module; 210-a pressure setting unit; 220-a flow monitoring device; 230-a temperature and pressure monitoring device; 240-a first actuator; 250-a second actuator; 260-a third actuator; 270-a fourth actuator; 280-an electrical controller;
300-a control module; 310-a data processing center;
400-high and low temperature module; 410-explosion-proof tooling;
500-a media recovery module;
600-leak detection module.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is more than two, if there are first and second described for the purpose of distinguishing technical features, but not for indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The core of the invention is to provide a performance testing device for a vehicle-mounted high-pressure valve of a hydrogen fuel cell vehicle, which can verify the reliability and durability of a hydrogen valve with long service life and low cost.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 5, fig. 1 is a schematic connection diagram of a performance testing device for vehicle-mounted high-pressure valves of a hydrogen fuel cell vehicle according to the present invention; FIG. 2 is a schematic diagram of a connection relationship of a boosting module according to the present invention; FIG. 3 is a schematic diagram of a connection relationship of test modules provided in the present invention; FIG. 4 is a schematic structural diagram of an explosion-proof fixture provided by the invention; fig. 5 is a schematic structural diagram of a flow monitoring device provided in the present invention.
When the method is implemented, no experience and technology can be used for reference at home, and the understanding of various foreign related standards in the industry is different due to unclear process definition and unclear parameters, so that unified understanding in the industry cannot be formed. The invention reasonably designs a set of testing device for verifying the reliability and durability of the vehicle-mounted hydrogen high-pressure valve based on the actual use working condition of the part and in combination with the special requirements of the part, and the device can realize the device for verifying the reliability and durability of the hydrogen valve. Hardware support and principle basis are provided for the localization development and verification of the vehicle-mounted hydrogen valve of the hydrogen fuel cell vehicle, and possibility is provided for promoting the domestic 70MPa high-voltage vehicle-mounted hydrogen storage technology to be popularized.
The main design concept of the scheme comprises the following points:
providing a set of accelerated verification method for reliability and durability of high-pressure valve S
Due to the fact that the industry is relatively new, a plurality of hydrogen valve standards are lost, and a test method for the hydrogen high-pressure valve S can be designed only based on the whole vehicle application condition of a hydrogen fuel cell vehicle and the special use requirements of the valve. Considering that the main failure mode of the valve is the wear failure of the internal soft seal, the failure rule of the soft seal is in positive correlation with the total wear distance, the method ensures that the internal structure of the valve bears frequent alternating load by artificially controlling parameters such as pressure ratio, flow, medium on-off state, cycle period and the like before and after the valve, realizes that the valve core frequently does reciprocating motion with the maximum stroke, artificially increases the wear of the internal sealing element with the maximum efficiency, records the cycle times when the valve fails, and has the advantages of
L＝Y×l0，----------------------------1-1
L is the total distance (mm) of abrasion when the valve core fails, Y is the cycle number (times) when the valve fails, and L0 is the distance (mm) of single-time back-and-forth abrasion of the valve core;
by using an empirical calculation formula, the method can be used,
X＝(Y-10000)/2000；------------------------------1-2
y is total cycle number (times), X is service life (years) of the valve
And (1-1) and (1-2) are used as a method for judging the reliability and durability of the valve, and further the service lives of a dynamic seal, a static seal and a valve core and a valve clack of an actuating mechanism in the valve are verified. This test is an accelerated durability test.
In this embodiment, the integrated high and low temperature module 400 can provide temperature load, and also test the reliability and durability of the valve in high and low temperature states based on the working conditions of the vehicle.
(II) high pressure valve piece S verification with minimal cost
The hydrogen valve endurance test needs to adopt hydrogen as a medium, the test cycle number of the hydrogen valve endurance test is 10,000-100,000 times, the order of magnitude is that the single cycle period is about 10 seconds, the two processes of pressurization and release are included, the consumption of the hydrogen is extremely large, and the hydrogen is usually directly discharged into the atmosphere, so that the environment is polluted and the potential safety hazard is caused. The cost required to complete the durability of a hydrogen valve in the industry is typically between 100 and 150 million. In this embodiment, the medium recovery module 500 is designed, the inlet of the module is connected to the post-valve bleed line of the high-pressure valve S to be tested, the pipe introduces the exhaust gas into the buffer tank 130 and the booster pump inside the medium recovery module 500, and the outlet of the medium recovery module 500 is connected to the inlet of the booster module 100. The booster pump of the medium recovery module 500 is particularly selected to be a small-boost-ratio and large-flow pump to match the booster pump with a large-boost-ratio and a small-flow pump in the downstream booster module 100, so that the matching optimization of pressure and flow is realized. In addition, the module is also provided with a pressure and flow monitoring device 220 and corresponding software control logic, so that the efficient and safe recycling of the medium is realized, and the test cost can be reduced to within 15 ten thousand.
In the embodiment, the medium module designed in the integrated scheme of the device realizes the recovery and cyclic utilization of waste gas, the function is not possessed by various valve verification devices in the industry, and the device realizes and realizes good economic effect and environmental effect for the first time.
(III) the problems of high loss and low service life of the pressurizing module 100 are solved, and the long-service-life operation of the equipment is realized
The booster pump is one of the core components of the device and is also a high-loss part. Traditional pressure boost is realized through the booster pump in the trade, and the booster pump work utilizes the principle realization that "big piston promotes little piston", and the reciprocating motion that utilizes the piston inside is realized to the essence, and the dynamic seal in the pump is very big challenge, frequently opens the pump and can greatly consume the life-span of pump, considers that hydrogen valve test cycle number is up to 100, 000, and very big to the consumption of air supply, and this kind of operating mode is very big to the examination of pump.
In this embodiment, the problem of pump life is solved from two aspects. On one hand, the frequency of reciprocating motion of a piston in the pump is increased rapidly due to the high pressure ratio, and the reciprocating times of the pump can be effectively reduced by reducing the pressure ratio. The output pressure of the booster pump selected in the medium recovery module 500 is set within the optimal operating pressure interval of the booster pump of the booster module 100, so that the booster ratio is maintained within a reasonable range; on the other hand, the rapid consumption of the air source can cause the pressure loss of the pump end, and the booster pump is frequently started to compensate the pressure, so that the service life is shortened. In this embodiment, the integration of the pressurization module 100 considers reducing the frequent pressure loss at the pump end, the high-pressure buffer tank 130 is integrated behind the pump, the size and the volume of the buffer tank 130 are smaller than the lowest limit monitored by laws and regulations, and the maintenance of the later-stage equipment is also facilitated.
(IV) solving the post-valve flow control of the high-pressure valve S valve
In this embodiment, a fluid principle of the laval nozzle is innovatively utilized, the laval nozzle is applied to the hydrogen valve testing device first, and accurate control over the medium flow behind the high-pressure valve S is achieved. The Laval nozzle is an actuator of a flow control unit, and only one driving potential of sectional area change is considered in variable-section one-dimensional constant flow according to the principle, and other driving potentials such as friction, heat transfer, gravity and the like are ignored, so that the flow is adiabatic and frictionless, namely, isentropic flow, and a variable-section constant isentropic flow model.
The control equation system of variable cross section one-dimensional constant isentropic flow is as follows:
m＝ρVA＝const----------------------------2-1
dp＝ρVdv------------------------------2-2
d(h+0.5V2)＝0----------------------------2-3
the one-dimensional constant isentropic flow velocity in the convergent channel can only be changed continuously to M =1, i.e. a critical state is reached, after which the flow velocity cannot be increased nor decreased, and this phenomenon in the convergent channel is called flow choking, so that a constant sonic flow nozzle is obtained. The electromagnetic valve is arranged in the spray pipe to control the medium to be switched on and off through PWM, the opening time of the spray pipe in a single period is controlled by adjusting the duty ratio through the controller, and then the flow behind the valve is accurately controlled.
Q＝q*T--------------------------------2-4
Q is the post-valve flow, Q is the volume flow of sonic flow per unit time, and T is the opening time
In this embodiment, in order to obtain a large post-valve flow rate, the flow control unit adopts a plurality of actuators connected in parallel, and through calculation and controller calibration, the upper limit of flow control is greatly improved, and accurate control of the post-valve flow rate is also realized.
(V) quantitative determination and qualitative determination method for micro leakage of high-pressure valve S
In this embodiment, in order to increase the accuracy and sensitivity of the determination of the minute leak rate, a vacuum leak detection method is innovative. A special explosion-proof tool 410 is designed in the high-low temperature module 400, in order to maximize the volume, the shape of a cylindrical dome is specially adopted, an upper cover of the tool is matched with a sealing ring of a base, end face sealing is formed under the action of the self gravity of the upper cover and a bolt, and then a vacuum pump is used for pumping the interior of the tool (a vacuum chamber) to a target vacuum degree, so that the influence of environmental gas is eliminated. When the high-voltage valve S to be detected generates medium leakage, due to Brownian motion of molecules, the medium can be quickly and uniformly distributed in the whole vacuum space at the first time, then is captured by a suction gun of the leak detector, and finally, medium atoms are captured and counted by a counter in a target area through ionization and an electromagnetic accelerator, so that high-sensitivity quantitative determination of micro leakage rate is realized.
In addition, in order to improve the efficiency of detecting the failure of the high-pressure valve piece S, the device connects the characteristic interface of the valve to a beaker, when leakage is generated at the characteristic interface, the leakage can be gathered into bubbles in the beaker, infrared rays can deviate from the targeted receiving device in the floating process of the bubbles to count the bubbles, and the method can provide a qualitative measuring method for the leakage of the valve.
(VI) realizing the protection function of the equipment device
In the implementation case, the characteristics that the hydrogen valve testing period is long in time span, the equipment needs high-strength continuous operation and the like are considered, and the design of an active and passive installation framework of the equipment is specially designed for enabling the equipment to have the function of 24-hour unattended automatic operation.
The framework sets the functions of detection means, fault classification, fault response, equipment scram, over-temperature and over-pressure active protection and the like in a targeted manner by starting from potential risk factors existing in equipment and combining with a specific potential failure mode.
Based on the design concept, the invention provides a performance testing device for a vehicle-mounted high-pressure valve S of a hydrogen fuel cell vehicle, which comprises a pressurization module 100, a testing module 200, a high-temperature module 400, a low-temperature module 400, a medium recovery module 500 and a control module 300.
The pressurization module 100 is used for pressurizing the medium gas.
The test module 200 includes a pressure setting unit 210 and a control unit, and is used for adjusting the pressure of the medium gas and controlling the on-off state, the cycle time, the cycle times or the flow after the valve of the medium gas in the test process.
The high and low temperature module 400 is used to provide high and low temperature load to the high pressure valve S.
The medium recovery module 500 is used for recovering the medium gas and performing pressure adjustment and buffering.
The control module 300 is used for controlling the opening and closing of the control components of the test module 200 and the high and low temperature module 400 and analyzing the parameters of the high-pressure valve piece S. Specifically, the control module 300 is electrically or signal-connected to the respective control components of the test module 200 and the high and low temperature module 400.
The high-pressure valve S is disposed in the inner cavity of the high-low temperature module 400, the outlet of the pressurization module 100 is communicated with the inlet of the test module 200, the outlet of the test module 200 is communicated with the inlet of the high-pressure valve S through the high-low temperature module 400, the outlet of the high-pressure valve S is communicated with the inlet of the medium recovery module 500 through the high-low temperature module 400, and the outlet of the medium recovery module 500 is communicated with the inlet of the pressurization module 100.
The performance testing device for the vehicle-mounted high-pressure valve S of the hydrogen fuel cell vehicle is characterized in that high-pressure medium gas is provided through a pressurizing module 100, the medium gas controls the pressure, the on-off state, the cycle time (duration) cycle times or the post-valve flow parameters of the medium gas through a pressure setting unit 210 and a flow control unit of a testing module 200, and then the medium gas is output to the high-pressure valve S to be tested in a high-low temperature module 400, and the medium gas is monitored by the high-pressure valve S through the flow control unit and various transmitters and then is connected with an inlet of a medium recovery module 500, so that the collection, storage and automatic analysis of a testing process and testing data are realized. The medium recovery module 500 resets the medium gas behind the high-pressure valve S to be tested and outputs the medium gas to the pressurization module 100, so that the medium gas is recycled, and the reliability and durability of the high-pressure valve S can be verified with long service life and low cost.
Preferably, the present invention further comprises a leak detection module 600 for detecting whether the medium gas inside the high-pressure valve element S leaks. In the testing process, the leak detection module 600 can be used for qualitatively and quantitatively detecting the air tightness of the high-pressure valve piece S to be tested.
In a specific form, the present disclosure further designs an explosion-proof fixture 410, the explosion-proof fixture 410 is disposed in the high and low temperature module 400, an inner cavity of the explosion-proof fixture 410 is used for accommodating a high-pressure valve S, the explosion-proof fixture 410 is provided with a plurality of interfaces for communicating with the outside, and an inlet and an outlet of the high-pressure valve S are communicated with the test module 200 through the interfaces of the explosion-proof fixture 410.
The working principle is as above, the leak detection module 600 is composed of a helium detector, a bubble cup, a vacuum pump, a vacuum gauge and the like, and the vacuum pump is sufficient to pump the inside of the tool to a target vacuum degree so as to eliminate the influence of environmental gas, namely the tool can be regarded as a vacuum chamber. The tool in the high-low temperature module 400 is vacuumized through the vacuum pump, the vacuum degree can be controlled below a target value, when the high-pressure valve S to be detected leaks, the medium gas can be captured by a suction gun of the helium detector, and the quantitative measurement and calculation of the medium leakage rate can be obtained through the counting of the mass spectrometer.
In order to realize the sealing performance of the explosion-proof tool 410 and also achieve an explosion-proof effect, as shown in fig. 4, the whole tool is made of 316L stainless steel, so that hydrogen embrittlement can be effectively prevented. Explosion-proof frock 410 specifically includes upper cover and base two parts, and the upper cover directly adopts flange bolted connection with the base, has the sealing washer between the two, and the frock inner space keeps apart with external world after the bolt-up, and this frock chooses for use the heavy wall thickness in order to increase structural strength and self weight when designing, and the upper cover lid is good the back, utilizes upper cover self weight to do the extrusion sealing washer and realizes sealing, has ingeniously taken into account explosion-proof, also provides the enclosure space for vacuum method leak hunting. And various standard interfaces are reserved on the base, so that the base can be conveniently connected with various valves to be tested.
Of course, the leak detection module 600 also has another method of leak detection, the leak detection module 600 including: the bubble cup is used for placing the interface of the high-pressure valve piece S; and the counter is used for counting the number of the bubbles leaked by the high-pressure valve piece S through the infrared signal, so that the qualitative measurement of the leakage rate of the valve is realized.
The high-pressure valve S related interface is connected into the bubble cup, when the high-pressure valve S to be measured leaks, a certain amount of bubbles can be generated in unit time, and the number of the bubbles can be counted by the counter through infrared signals, so that the qualitative measurement of the leakage rate of the valve is realized.
In one embodiment, the high and low temperature module 400 includes a high and low temperature test chamber, the high pressure valve S is disposed in the high and low temperature test chamber, the high pressure valve S is communicated with the test module 200 through the explosion-proof tool 410 and the pipeline, and the pipeline penetrates through the high and low temperature test chamber.
Specifically, all potential heat sources, ignition sources, are retrofitted outside the bin and are isolated from the bin by explosion proof tooling 410. The heating principle also adopts wind heat and wind cooling with explosion-proof function, and meanwhile, an explosion-proof tool 410 is designed in the high-low temperature module 400, various valve interfaces are reserved in the explosion-proof tool, and the explosion-proof tool can be connected with a high-pressure valve S to be tested through the interfaces. Explosion-proof frock 410 has built a totally enclosed space in arranging high low temperature test box in, through carrying out the evacuation to this space, because explosion-proof frock 410 self design intensity is very strong, can also compromise explosion-proof function. In addition, the high-low temperature test chamber can also provide temperature load, and can be used for carrying out the test of the performance attenuation condition of the hydrogen valve under the high-low temperature load.
In one embodiment, as shown in fig. 2, the pressurizing module 100 includes a pressurizing pump and a buffer tank 130, an inlet of the pressurizing pump is used for introducing the medium gas, an outlet of the pressurizing pump is communicated with an inlet of the buffer tank 130, and an outlet of the buffer tank 130 is communicated with an inlet of the test module 200.
Wherein, the booster pump is used for the medium gas pressure boost, and buffer tank 130 is as the buffer vessel of booster pump and test module 200, can reach the purpose of steady voltage. The medium gas can be filled with high-pressure medium into the buffer tank 130 downstream of the booster module 100 by the booster pump of the booster module.
On the basis of the above-described embodiment, the booster pumps include at least the first booster pump 110 and the second booster pump 120 connected in series with each other. The pressurizing module 100 pressurizes the medium gas twice by the pressurizing pump, and then forms a stable medium gas together with the buffer tank 130 for outputting to the testing module 200.
It should be noted that, the low-pressure medium is pressurized twice, and the medium gas is pressurized from the minimum 10bar to 1000bar by optimizing the flow rate and pressure matching of the double-stage pump by mainly utilizing the principle that a large piston pushes a small piston.
Meanwhile, the boosting module 100 further includes a first cooler 140 disposed between the first and second booster pumps 110 and 120, and a second cooler 150 disposed between the second booster pump 120 and the buffer tank 130, and an inlet port of the first cooler 140 and an inlet port of the second cooler 150 are further communicated with the driving gas.
The driving gas is used for driving each executing piece and is the power for the equipment to act. The tail gas of the driving gas is used for air cooling the pump head of the booster pump, so that the overtemperature of the pump opening caused by high boosting ratio is effectively controlled. Further, a first temperature and pressure guard 160 and a second temperature and pressure guard 170 may be further provided between the first booster pump 110 and the second booster pump 120, and between the second booster pump 120 and the buffer tank 130. Temperature and pressure protection devices are integrated in the pressurizing module 100, so that failures such as over-temperature and over-pressure of the device can be effectively detected, and the failures can be emergently processed by utilizing program optimization.
In another embodiment, the medium recovery module 500 comprises a third booster pump having an output pressure within an optimal operating pressure interval of the booster pumps of the booster module 100.
The booster pumps in the booster module 100 and the medium recovery module 500 are one of the core components of the apparatus, and are also high loss members. Traditional pressure boost is realized through the booster pump in the trade, and the booster pump work of this case utilizes the principle realization of "big piston promotes little piston", and the reciprocating motion that utilizes the piston inside is realized to the essence, and is very big challenge to the dynamic seal in the pump, frequently starts the pump and can greatly consume the life-span of pump, considers that high-pressure valve S tests the cycle number and reaches 100, 000, and very big to the consumption of air supply, and this kind of operating mode is very big to the examination of pump.
Based on the above background, in the present embodiment, the lifetime problem of the booster pump is solved from two aspects. On one hand, the frequency of reciprocating motion of a piston in the pump is increased rapidly due to the high pressure ratio, and the reciprocating times of the pump can be effectively reduced by reducing the pressure ratio. The output pressure of the selected third booster pump in the medium recovery module 500 is set within the optimum operating pressure interval of the booster pumps of the booster module 100, thereby maintaining the booster ratio within a reasonable range; on the other hand, the rapid consumption of the air source can cause the pressure loss of the pump end, and the booster pump is frequently started to compensate the pressure, so that the service life is shortened. In this embodiment, the integration of the pressurization module 100 considers reducing the frequent pressure loss at the pump end, the high-pressure buffer tank 130 is integrated behind the pump, the size and the volume of the buffer tank 130 are smaller than the lowest limit monitored by laws and regulations, and the maintenance of the later-stage equipment is also facilitated.
In addition, the medium recycling module 500 further includes a flow and back pressure monitoring module for controlling the timing of opening the third booster pump and the cooperation of the upstream and downstream flow and pressure.
The medium recovery module 500 can re-input the medium after the valve to be tested into the pressurization module 100 after pressure setting and buffering, and in order to reduce the influence of the backpressure of the medium recovery module 500 on the measurement of the parameter after the valve of the high-pressure hydrogen valve to be tested, the module is provided with a flow and backpressure monitoring module for controlling the pump starting time and the coordination of the upstream flow and the downstream flow and the pressure.
In a specific embodiment, the control unit of the test module 200 includes a flow monitoring device 220 and a temperature and pressure monitoring device 230, the pressure setting unit 210 includes a main pressure regulating valve, an inlet of the main pressure regulating valve is communicated with an outlet of the pressure boosting module 100, an outlet of the main pressure regulating valve is communicated with an inlet of a high pressure valve S, an outlet of the high pressure valve S is respectively communicated with the flow monitoring device 220 and an inlet of the medium recovery module 500, and the temperature and pressure monitoring device 230 is disposed between the main pressure regulating valve and the high pressure valve S.
Correspondingly, the control module 300 at least includes a data processing center 310, the data processing center 310 is configured to control the electrical controller 280, the temperature and pressure monitoring device 230, and the flow monitoring device 220 to perform corresponding operations, and the temperature and pressure monitoring device 230 and the flow monitoring device 220 feed back corresponding detection values to the data processing center 310, so as to implement closed-loop logic control.
A first actuator 240 is connected in series between the main pressure regulating valve and the high-pressure valve element S, a second actuator 250, a third actuator 260 and a fourth actuator 270 are respectively arranged at the downstream of the warm-pressure monitoring device 230, the high-pressure valve element S and the flow monitoring device 220, and the first actuator 240, the second actuator 250, the third actuator 260 and the fourth actuator 270 are all pneumatic valves;
the control unit further comprises an electric controller 280 for respectively controlling the pressure setting unit 210, the first actuator 240, the second actuator 250, the third actuator 260 and the fourth actuator 270, and for opening and closing the valve rod or the valve by driving the air, and the electric controller 280, the temperature and pressure monitoring device 230 and the flow monitoring device 220 are respectively electrically connected or in signal connection with the control module 300.
The electric controller 280 is a plurality of electric proportional valves, can realize stepless regulation of pressure and speed, avoids the impact phenomenon when a normally-open switch type air valve is reversed, and can realize remote control and program control. Specifically, for example, the plurality of electric proportional valves correspond to the pressure setting unit 210, the flow monitoring device 220, and the actuators one by one, the opening degree of the valve rod of the pressure setting unit 210 itself or the valves of the actuators can be adjusted by electric signals, and the pressure setting unit 210 and the actuators can be started by driving gas.
Correspondingly, the downstream of the first actuator 240, the second actuator 250, the third actuator 260 and the fourth actuator 270 is also communicated with a pressure relief pipeline, so that the function of quickly relieving pressure before and after the valve is realized.
In addition, the control module 300 designs a control program and a user interface, and a user realizes manual and automatic control of the self-contained device through the user interface, and in addition, the control module 300 can sample, display and automatically store various characteristic parameters of the valve to be tested, and can perform curve drawing and data analysis on test data, so that the user can conveniently and visually judge the performance of the hydrogen valve.
Based on the above design, the test module 200 adjusts the pressure of the medium air source and controls parameters such as the on-off state of the medium, the cycle time, the cycle times, the flow rate after the valve and the like in the test process through the electric proportional valve, the pneumatic valve, the main pressure regulating device, the flow meter, the proportional valve and the like. The re-adjusted medium can be connected with the front end and the rear end of the hydrogen valve to be tested through the tool inside the high-low temperature module 400, the rear end of the hydrogen valve is connected with the medium return circuit of the test module 200, and the flow monitoring device and the flow control device inside the test module 200 can realize closed-loop control on the flow and the pressure of the medium return circuit.
As shown in fig. 3, the test module 200 of the device for testing the performance of the vehicle-mounted high-pressure valve S of the hydrogen fuel cell vehicle according to the embodiment of the present invention may re-adjust the medium pressure at the rear end of the slave pressurizing module 100, and may control the on-off state of the gas path through the linkage of the electric proportional valve and the pneumatic valve, and in addition, various transmitters integrated therein may acquire the state parameters of the medium pressure, the temperature, the flow rate, and the like before and after the valve of the to-be-tested valve in real time, so as to provide possibility for the analysis of the subsequent test data.
In one embodiment, as shown in fig. 5, the flow monitoring device 220 includes a front pneumatic valve, a flow meter, a solenoid valve, a laval nozzle, and a rear pneumatic valve, which are sequentially arranged in series, and a flow monitoring controller for controlling the front pneumatic valve, the flow meter, and the solenoid valve. Of course, the electromagnetic valves and the laval nozzles are a group of flow control actuators corresponding to each other, and a plurality of groups of flow control actuators can be connected in parallel.
A laval nozzle is a commonly used fluid element, and when the pressure ratio between the inlet and the outlet is greater than the critical pressure ratio, the outlet will create flow choking, i.e. the flow of the compressible fluid in the flow channel no longer varies with the downstream conditions under a given initial condition, when the mass flow rate reaches a maximum value, i.e. the critical flow q. And the total flow Q = Q × t, t is the total circulating time, so that the flow is in direct proportion to the time, and the circulating time is controlled by adjusting the duty ratio driven by the electromagnetic valve, so as to obtain the preset flow value. The flow monitoring device 220 utilizes the physical characteristics of flow congestion to control the flow.
Based on the design, through installation test, the test flow of the device meets the requirements of airtightness test, characteristic test and accelerated durability test, the variable load is born in the valve by controlling the parameters of pressure, flow, medium on-off state, frequency and the like before and after the valve, the executive component does reciprocating motion with the maximum stroke under specific conditions, thereby verifying the fatigue life of the dynamic seal, the static seal, the valve core and the valve clack of the executive mechanism in the valve, the valve with known life attenuation law is used for testing, and the test result meets the objective law.
The medium recovery device can recycle the test waste gas, the reasonable model selection of the booster pump can prolong the service life of the equipment, and the test cost is greatly reduced. According to the conventional test equipment in the industry, the service life of the booster pump is only about 1 year generally, and the booster pump is still intact from 2020 to the present. The testing cost is calculated according to the quotation of the Rugao national motor vehicle detection center, the endurance testing cost of a certain valve element is 80 ten thousand yuan, and the testing cost of the device can be controlled within 15 ten thousand due to the recycling of media.
Valve testing devices commonly used in the industry control the flow behind a valve by using closed-loop logic consisting of a thermal or Coriolis flowmeter, a proportional valve, a control unit and the like, and due to the limitation of the flowmeter principle, the measurement and calculation delay of the flow is large, and the flow behind the valve can not be accurately controlled within 5-15 seconds generally. And because the working range of the proportional valve is limited, the control of the flow is also nonlinear, so that the proportional valve can only be applied to relatively rough tests. The device utilizes the principle characteristic of the Laval nozzle and utilizes the fluid device to solve the problem of accurate control of medium flow.
The device improves the detection sensitivity and accuracy of the airtightness of the hydrogen valve. The measurement of the micro leakage amount of the valve is solved by ingeniously utilizing the closed vacuum space and the molecular Brownian motion created by the tool. In addition, by combining with an empirical detection means, the device also provides a bubble counting method for qualitative test, and is used for occasions with relatively high requirements on detection precision. In practical use, the detection precision of the vacuum method can reach 10 < -9 > mbar.L/s, and the bubble method is suitable for measuring the leakage rate at 10 < -6 > mbar.L/s.
The device also adopts various safety detection means from the hydrogen safety angle, active and passive safety protection strategies are designed for potential failures such as overpressure safety valve relief, high-pressure burst, circuit fault emergency stop, overtemperature thrombolysis relief, hydrogen concentration detection alarm, overall explosion prevention, pressure and temperature transmitter monitoring and the like which may occur, when certain failure occurs, the control module 300 controls and carries out monitoring and logic judgment of relevant parameters according to abnormal data and judgment threshold values of various transmitters, automatically diagnoses and emergently acts on the fault, and has 24-hour unattended testing capability. The device can also automatically collect, store and analyze test data, and provide powerful guarantee for the general law of follow-up research valve performance.
In conclusion, the device is based on the principle that the high-pressure valve S fails, is innovated and invented by combining the application working condition of a hydrogen fuel cell automobile, is long in service life, low in cost, full-automatic and unattended, and is used for verifying the reliability and durability of the high-pressure valve S, corresponding software and hardware facilities are designed, and a new river is created for fully verifying the performance of the high-pressure valve S.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (14)
1. The utility model provides a hydrogen fuel cell car-mounted high pressure valve member capability test device for carry out capability test to high pressure valve member, its characterized in that includes:
the pressurization module is used for pressurizing the medium gas;
the test module comprises a pressure setting unit and a control unit and is used for adjusting the pressure of the medium gas and controlling the on-off state, the cycle time, the cycle times or the flow after the valve of the medium gas in the test process;
the high and low temperature module is used for providing high and low temperature load for the high-pressure valve;
the medium recovery module is used for recovering medium gas and performing pressure adjustment and buffering;
the control module is used for controlling the opening and closing of the control parts of the test module and the high-low temperature module and analyzing the parameters of the high-pressure valve;
wherein, high pressure valve spare is arranged in the inner chamber of high low temperature module, the export of pressure boost module with the entry intercommunication of test module, the export of test module passes through high low temperature module with the entry intercommunication of high pressure valve spare, the export of high pressure valve spare passes through high low temperature module with the entry intercommunication of medium recovery module, the export of medium recovery module with the entry intercommunication of pressure boost module.
2. The device for testing the performance of the vehicle-mounted high-pressure valve of the hydrogen fuel cell vehicle as claimed in claim 1, further comprising a leak detection module for detecting whether the medium gas in the high-pressure valve leaks.
3. The vehicle-mounted high-pressure valve performance testing device for the hydrogen fuel cell vehicle as claimed in claim 2, further comprising an explosion-proof tool arranged in the high and low temperature module, wherein an inner cavity of the explosion-proof tool is used for accommodating the high-pressure valve, the explosion-proof tool is provided with a plurality of interfaces used for being communicated with the outside, and an inlet and an outlet of the high-pressure valve are communicated with the testing module through the interfaces of the explosion-proof tool;
the leak detection module includes:
the vacuum pump is used for vacuumizing the explosion-proof tool;
the helium detector is used for capturing whether medium gas is generated in the explosion-proof tool;
and the mass spectrometer is used for counting and quantitatively measuring the medium leakage rate of the helium detector.
4. The device for testing the performance of the vehicle-mounted high-pressure valve of the hydrogen fuel cell vehicle as claimed in claim 3, wherein the explosion-proof tool comprises an upper cover and a base which are connected with each other, a sealing ring is arranged between the contact surfaces of the upper cover and the base, the upper cover is dome-shaped, and the wall thickness of the upper cover is greater than that of the base.
5. The device for testing the performance of the vehicle-mounted high-pressure valve element of the hydrogen fuel cell vehicle as claimed in claim 3, wherein the high-low temperature module comprises a high-low temperature test box, the high-pressure valve element is arranged in the high-low temperature test box, the high-pressure valve element is communicated with the test module sequentially through the explosion-proof tool and a pipeline, and the pipeline penetrates through the high-low temperature test box.
6. The device for testing the performance of the vehicle-mounted high-pressure valve element of the hydrogen fuel cell vehicle as claimed in claim 2, wherein the leak detection module comprises:
the bubble cup is used for being placed into the interface of the high-pressure valve;
and the counter is used for counting the number of the bubbles leaked by the high-pressure valve piece through the infrared signal so as to realize qualitative measurement of the leakage rate of the valve.
7. The vehicle-mounted high-pressure valve performance testing device for the hydrogen fuel cell vehicle as claimed in claim 1, wherein the pressurizing module comprises a pressurizing pump and a buffer tank, an inlet of the pressurizing pump is used for introducing the medium gas, an outlet of the pressurizing pump is communicated with an inlet of the buffer tank, and an outlet of the buffer tank is communicated with an inlet of the testing module.
8. The hydrogen fuel cell vehicle-mounted high-pressure valve member performance testing device as recited in claim 7, wherein the booster pump comprises at least a first booster pump and a second booster pump which are connected in series with each other.
9. The vehicle-mounted high-pressure valve performance testing device for the hydrogen fuel cell vehicle as claimed in claim 8, wherein the pressurizing module further comprises a first cooler disposed between the first pressurizing pump and the second pressurizing pump, and a second cooler disposed between the second pressurizing pump and the buffer tank, and an air inlet of the first cooler and an air inlet of the second cooler are further communicated with the driving gas.
10. The vehicle-mounted high-pressure valve performance testing device for the hydrogen fuel cell vehicle as claimed in claim 7, wherein the medium recovery module comprises a buffer tank and a third booster pump, and the output pressure of the third booster pump is within an optimal working pressure range of the booster pump of the booster module.
11. The device for testing the performance of the vehicle-mounted high-pressure valve of the hydrogen fuel cell vehicle as claimed in claim 10, wherein the medium recovery module further comprises a flow and back pressure monitoring module for controlling the matching of the opening timing of the third booster pump and the upstream and downstream flow and pressure.
12. The device for testing the performance of the vehicle-mounted high-pressure valve element of the hydrogen fuel cell vehicle as claimed in claim 1, wherein the control unit of the test module comprises a flow monitoring device and a temperature and pressure monitoring device, the pressure setting unit comprises a main pressure regulating valve, an inlet of the main pressure regulating valve is communicated with an outlet of the pressurization module, an outlet of the main pressure regulating valve is communicated with an inlet of the high-pressure valve element, an outlet of the high-pressure valve element is respectively communicated with the flow monitoring device and an inlet of the medium recovery module, and the temperature and pressure monitoring device is arranged between the main pressure regulating valve and the high-pressure valve element.
13. The device for testing the performance of the vehicle-mounted high-pressure valve element of the hydrogen fuel cell vehicle as claimed in claim 12, wherein a first actuator is connected in series between the main pressure regulating valve and the high-pressure valve element, a second actuator, a third actuator and a fourth actuator are respectively arranged at the downstream of the warm-pressure monitoring device, the downstream of the high-pressure valve element and the downstream of the flow monitoring device, and the first actuator, the second actuator, the third actuator and the fourth actuator are all pneumatic valves;
the control unit further comprises an electric controller used for respectively controlling the pressure setting unit, the first actuator, the second actuator, the third actuator and the fourth actuator, the electric controller is used for driving a pneumatic starting valve rod or a valve to be opened and closed, and the electric controller, the temperature and pressure monitoring device and the flow monitoring device are respectively electrically connected or in signal connection with the control module.
14. The device for testing the performance of the vehicle-mounted high-pressure valve element of the hydrogen fuel cell vehicle as claimed in claim 12, wherein the flow monitoring device comprises a front pneumatic valve, a flow meter, a solenoid valve, a laval nozzle and a rear pneumatic valve which are sequentially arranged in series, and a flow monitoring controller for controlling the front pneumatic valve, the flow meter and the solenoid valve.
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| CN202211041224.8A CN115389195A (en) | 2022-08-29 | 2022-08-29 | Performance testing device for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle |
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| CN202211041224.8A CN115389195A (en) | 2022-08-29 | 2022-08-29 | Performance testing device for vehicle-mounted high-pressure valve of hydrogen fuel cell vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116007858A (en) * | 2023-02-16 | 2023-04-25 | 广东国玉科技股份有限公司 | Gas circuit testing device, hydrogen fuel cell leakage detection method and storage medium |
| CN116520212A (en) * | 2023-01-13 | 2023-08-01 | 北京航天试验技术研究所 | Test system applied to high-pressure cold helium solenoid valve |
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2022
- 2022-08-29 CN CN202211041224.8A patent/CN115389195A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520212A (en) * | 2023-01-13 | 2023-08-01 | 北京航天试验技术研究所 | Test system applied to high-pressure cold helium solenoid valve |
| CN116520212B (en) * | 2023-01-13 | 2023-09-08 | 北京航天试验技术研究所 | Test system applied to high-pressure cold helium solenoid valve |
| CN116007858A (en) * | 2023-02-16 | 2023-04-25 | 广东国玉科技股份有限公司 | Gas circuit testing device, hydrogen fuel cell leakage detection method and storage medium |
| CN116007858B (en) * | 2023-02-16 | 2023-05-16 | 广东国玉科技股份有限公司 | Gas circuit testing device, hydrogen fuel cell leakage detection method and storage medium |
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