A vehicle high-pressure hydrogen pressure reducing valve testing device

Abstract

The present invention relates to a vehicle high-pressure hydrogen pressure reducing valve testing device, comprising a gas source and a hydrogen pipeline, a pressure regulating mechanism arranged on the hydrogen pipeline, a pressure reducing valve workpiece to be tested, a first pressure gauge and a flow controller, wherein the hydrogen pipeline comprises a main pipeline connected to the gas source and a bypass arranged on the main pipeline; the pressure regulating mechanism comprises a switch valve, a primary pressure reducing valve, a first hydrogen path switching valve, a secondary pressure reducing valve and a one-way valve arranged on the main pipeline in sequence; a second hydrogen path switching valve is arranged on the bypass, and is connected in parallel with the first hydrogen path switching valve, the secondary pressure reducing valve and the one-way valve. Compared with the prior art, the present invention has the advantages of high measurement accuracy, small measurement error, high degree of automation, and saving of manpower and material resources.

Description

Technical Field

[0001] The invention relates to a device for measuring flow characteristics of a pressure reducing valve, in particular to a device for testing a high-pressure hydrogen pressure reducing valve for a vehicle. Background Art

[0002] With the increasing expansion of the hydrogen energy industry and the large-scale development of hydrogen energy, the optional parts related to hydrogen medium have also greatly increased. However, as hydrogen is a flammable and explosive substance, how to ensure its safety during use has become an inevitable factor. In the field of hydrogen energy, the storage and use of high-pressure hydrogen is the most economical and reasonable way of use under the current technical state, and has been verified by a large number of uses. During the use of high-pressure hydrogen, the pressure reducing valve is required to accurately control the pressure and flow of hydrogen to stabilize it to a pressure and flow suitable for fuel cells. The performance of the pressure reducing valve directly affects the service life of the fuel cell, thereby affecting the life of the fuel cell vehicle.

[0003] Chinese patent CN100573083C discloses a method for continuous measurement of flow characteristics of pneumatic pressure reducing valves. It adopts a pressure reducing valve with a large overflow function as a regulating device for the load pressure or flow of the pressure reducing valve to be measured, and a flow meter with a bidirectional flow measurement function. By setting the flow from the maximum forward flow to the maximum overflow flow, continuous measurement of pressure and flow is achieved, thereby measuring the flow characteristics of the pressure reducing valve. However, when adjusting the outlet flow of the pressure reducing valve to be measured, the patent uses the same pressure regulating pressure reducing valve when the flow is small and when the flow is large. For the pressure increasing valve, its outlet pressure and flow change dynamically. Therefore, it is necessary to select a suitable pressure regulating mechanism according to the specific flow value to obtain a more accurate flow and pressure curve. Therefore, the measurement accuracy of the patented technology cannot meet the requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle high-pressure hydrogen pressure reducing valve testing device in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A vehicle high-pressure hydrogen pressure reducing valve testing device comprises a gas source and a hydrogen pipeline, a pressure regulating mechanism arranged on the hydrogen pipeline, a pressure reducing valve workpiece to be tested, a first pressure gauge and a flow controller.

[0007] The hydrogen pipeline includes a main pipeline connected to the gas source and a bypass arranged on the main pipeline; the pressure regulating mechanism includes a switch valve, a primary pressure reducing valve, a first hydrogen path switching valve, a secondary pressure reducing valve and a one-way valve arranged in sequence on the main pipeline; a second hydrogen path switching valve is provided on the bypass and is connected in parallel with the first hydrogen path switching valve, the secondary pressure reducing valve and the one-way valve.

[0008] The pressure regulating range of the first-stage pressure reducing valve is 21 to 1000 bar, and the pressure regulating range of the second-stage pressure reducing valve is 5 to 70 bar.

[0009] Since the pressure and flow at the outlet of the pressure reducing valve change dynamically, the flow accuracy of the pressure reducing valve will also change as the outlet pressure accuracy changes; when testing the performance of the pressure reducing valve to be tested, when the outlet flow of the pressure reducing valve to be tested is adjusted to the upper limit value, a high-range first-stage pressure reducing valve should be selected, and when the outlet flow of the pressure reducing valve to be tested is adjusted to the lower limit value, a bypass should be used to switch to a low-range second-stage pressure reducing valve; that is, the present invention can select a suitable pressure regulating mechanism according to the set value of the outlet flow of the specific pressure reducing valve to be tested, so that the measured pressure and flow curves have high accuracy; by performing multi-stage pressure structure adjustment, the full-range performance curve of the tested mechanism can be obtained.

[0010] A second pressure gauge is connected to the main line between the gas source and the switch valve, and a third pressure gauge is connected to the bypass line on the intake side of the second hydrogen path.

[0011] The outlet of the flow controller is connected to a safety pressure relief valve, and the outlet of the safety pressure relief valve is connected to a fourth pressure gauge.

[0012] Preferably, the switch valve, the first hydrogen path switching valve, the second hydrogen path switching valve, the first pressure reducing valve and the second pressure reducing valve are all pneumatic valves; the first pressure gauge, the second pressure gauge, the third pressure gauge and the fourth pressure gauge are all pressure sensors.

[0013] The device of the present invention also includes a control mechanism, which includes a controller connected to the first pressure gauge and the flow controller, and an electric valve connected to the controller; the controller is connected to the electric valve circuit, and the electric valve is arranged on the driving gas source pipeline of the switch valve, the first pressure reducing valve, the first hydrogen path switching valve, the second pressure reducing valve, and the second hydrogen path switching valve.

[0014] The electric valves arranged on the driving gas sources of the switch valve, the first hydrogen path switching valve and the second hydrogen path switching valve are high-pressure solenoid valves; the electric valves arranged on the driving gas sources of the first-level pressure reducing valve and the second-level pressure reducing valve are electric regulating valves.

[0015] The set opening pressure of the safety relief valve is 40 bar.

[0016] A fifth pressure gauge is provided at the inlet of the pressure reducing valve workpiece (PR121) to be tested, and the fifth pressure gauge is preferably a pressure sensor.

[0017] The outlets of the first-stage pressure reducing valve and the second-stage pressure reducing valve are both matched and connected with safety valves.

[0018] The main pipe is provided with a filter, and the gas source is connected to the inlet of the filter.

[0019] The flow controller is a mass flow controller, and its adjustment range is 28-1400Ln / Min.

[0020] The method for testing the performance of a hydrogen pressure reducing valve using the device of the present invention is specifically as follows:

[0021] During the test, different pressures of 10 bar, 50 bar, 100 bar, 200 bar, 350 bar, 500 bar, 600 bar and 700 bar are respectively used as the inlet pressure of the workpiece pressure reducing valve. Under a certain inlet pressure of the workpiece pressure reducing valve, the pressure reducing valve to be tested is adjusted to the set pressure value (≤10 bar), and then the mass flow controller is used to control the flow rate of the outlet of the pressure reducing valve workpiece to be tested, and the outlet pressure change of the pressure reducing valve workpiece to be tested is detected. Then, the pressure at the outlet of the pressure reducing valve is adjusted and controlled by the pressurizing valve to be tested, and the flow controller is used to detect the flow change at the outlet of the pressure reducing valve workpiece to be tested, so as to measure the outlet pressure-flow curve; when the mass flow controller controls the flow rate of the outlet of the pressure reducing valve workpiece to be tested to be the lower limit of the measured flow rate, that is, the outlet flow rate is small, the bypass is closed, and the inlet pressure of the workpiece to be tested is adjusted by the secondary pressure reducing valve; when the mass flow controller controls the flow rate of the outlet of the pressure reducing valve workpiece to be tested to be the upper limit of the measured flow rate, that is, the outlet flow rate is large, the bypass is opened, the first hydrogen path switching valve on the main pipe is closed, and the inlet pressure of the workpiece to be tested is adjusted by the primary pressure reducing valve. Finally, 8 outlet pressure-flow curves under 8 inlet pressure conditions were obtained and plotted in the same coordinate system; the temperature of the measuring medium was room temperature, and the flow range of the coordinate system was 0-2000 mL / min.

[0022] In the device of the present invention, the inlet pressure of the pressure reducing valve to be tested is ensured to be the set value by adjusting the settings of the two pressure reducing valves of the main pipeline. In order to ensure the stability and accuracy of the monitoring system, the present invention adopts a multi-stage pressure reducing method, and the secondary pressure reducing valve at the front end of the workpiece to be tested adopts a short range. A pressure sensor, i.e., a fifth pressure gauge, is designed at the front end of the pressure reducing valve to be tested, which is mutually verified with the measured value of the third pressure gauge at the front end of the secondary pressure reducing valve to ensure that the inlet pressure of the pressure reducing valve to be tested meets the set value; the outlet pressure of the pressure reducing valve to be tested is detected by the first pressure gauge, and the flow rate at the outlet of the pressure reducing valve is adjusted by the mass flow controller.

[0023] During the measurement process, the pressure information of the inlet pressure of the workpiece to be measured is collected through multiple pressure transmitters in the device and transmitted to the controller, thereby adjusting the inlet pressure of the workpiece to be measured to the set value; the use of an automated feedback adjustment mechanism greatly saves manpower, and the outlet pressure of the pressure reducing valve workpiece to be measured is recorded in real time through the pressure transmitter installed at the outlet of the pressure reducing valve workpiece to be measured.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] (1) According to the flow rate at the outlet of the pressure reducing valve to be tested, that is, the specific test requirements, the specific hydrogen pipeline and the pressure reducing valve with a specific range are appropriately selected, which greatly improves the accuracy of the measured pressure and flow curves;

[0026] (2) Designing multiple automated pressure transmitters, controllers, and control circuits improves the automation level of the measurement system and saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] In the figure, P1 is the gas source inlet, P2 is the vent, F101 is the filter, PT101 is the second pressure gauge, PT102 is the third pressure gauge, PT103 is the fourth pressure gauge, PT104 is the first pressure gauge, PAV101 is the switch valve, PAV102 is the first hydrogen path switching valve, PAV103 is the second hydrogen path switching valve, PR101 is the first pressure reducing valve, PR102 is the second pressure reducing valve, PR121 is the pressure reducing valve workpiece to be tested, PR111 is the first electric regulating valve, PR112 is the second electric regulating valve, SV111 is the first solenoid valve, SV112 is the second solenoid valve, SV113 is the third solenoid valve, CV101 is a one-way valve, PRV101 is a safety pressure relief valve, FT101 is a flow controller, 1 is a controller, 2 is a driving gas source pipeline, and 3 is a test chamber. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0030] Example

[0031] A vehicle high pressure hydrogen pressure reducing valve testing device, such as Figure 1As shown, it includes a gas source and a hydrogen pipeline, a pressure regulating mechanism arranged on the hydrogen pipeline, a pressure reducing valve workpiece to be tested PR121, a first pressure gauge PT104, a flow controller FT101 and a control mechanism. The hydrogen pipeline is connected to the gas source inlet P1; the pressure reducing valve workpiece to be tested PR121 is placed in the test chamber 3.

[0032] The hydrogen pipeline includes a main pipeline connected to the gas source and a bypass arranged on the main pipeline, and a filter F101 is arranged on the main pipeline, and the gas source is connected to the inlet of the filter F101. The pressure regulating mechanism includes a switch valve PAV101, a first pressure reducing valve PR101, a first hydrogen path switching valve PAV102, a second pressure reducing valve PR102 and a one-way valve CV101 arranged in sequence on the main pipeline; a second hydrogen path switching valve PAV103 is arranged on the bypass, and is connected in parallel with the first hydrogen path switching valve PAV102, the second pressure reducing valve PR102 and the one-way valve CV101, wherein the pressure regulating range of the first pressure reducing valve PR101 is 21 to 1000 bar, and the pressure regulating range of the second pressure reducing valve PR102 is 5 to 70 bar. A second pressure gauge PT101 is connected to the main pipe between the gas source and the switch valve PAV101, and a third pressure gauge PT102 is connected to the bypass on the air inlet side of the second hydrogen path; the outlet of the flow controller FT10 is connected to the safety pressure relief valve PRV101, and the outlet of the safety pressure relief valve PRV101 is connected to the fourth pressure gauge PT103; and the outlet of the mass flow controller FT101 is also connected to the vent P2. The switch valve PAV101, the first hydrogen path switching valve PAV102, and the second hydrogen path switching valve are all pneumatic valves PAV103; the first pressure gauge PT104, the second pressure gauge PT101, the third pressure gauge PT102, and the fourth pressure gauge PT103 are all pressure transmitters.

[0033] In this embodiment, the control mechanism includes a controller 1 connected to the first pressure gauge PT104, the second pressure gauge PT101, the third pressure gauge PT102, the fourth pressure gauge PT103 and the flow controller FT101, and an electric valve connected to the controller 1; the controller 1 is connected to the electric valve circuit, and the electric valve is arranged on the driving gas source pipeline 2 of the switch valve PAV101, the first pressure reducing valve PR101, the first hydrogen path switching valve PAV102, the second pressure reducing valve PR102, and the second hydrogen path switching valve PAV103; due to the first pressure reducing valve PR101 and the second pressure reducing valve PR102, the second pressure reducing valve PR102 and the second hydrogen path switching valve PAV103 are connected to the controller 1; the controller 1 is connected to the electric valve circuit, and the electric valve is arranged on the driving gas source pipeline 2 of the switch valve PAV101, the first pressure reducing valve PR101, the first hydrogen path switching valve PAV102, the second pressure reducing valve PR102 and the second hydrogen path switching valve PAV103; The pressure valve PR102 needs to accurately adjust the pressure value of the pipeline, and the electric valves connected to the two are all electric regulating valves, namely the first electric regulating valve PR111 and the second electric regulating valve PR112; while the switch valve PAV101, the first hydrogen path switching valve PAV102 and the second hydrogen path switching valve PAV103 only need to realize the function of switching the hydrogen path, that is, they only need the function of switching, and the electric valves installed on the driving air source of these three valves are selected as solenoid valves, namely the first solenoid valve SV111, the second solenoid valve SV112 and the third solenoid valve SV113.

[0034] In order to meet the test requirements of different pressures of 10bar, 50bar, 100bar, 200bar, 350bar, 500bar, 600bar, and 700bar as the inlet pressure of the workpiece pressure reducing valve, the maximum pressure of the hydrogen inlet in the present embodiment is 1000bar, the pressure regulation range of the first-stage pressure reducing valve is 21-1000bar, the pressure regulation range of the second-stage pressure reducing valve is 5-70bar, the flow adjustment range of the mass flow controller is 28-1400Ln / min, the pressure of the driving air source of each electric valve is 5-8bar, the flow rate is ≥500Ln / min, the output pressure of the pressure reducing valve workpiece to be tested is set to ≤10bar, and the set opening pressure of the safety pressure relief valve PRV101 is 40bar.

[0035] The device measurement method of the present invention is:

[0036] Different pressures of 10bar, 50bar, 100bar, 200bar, 350bar, 500bar, 600bar, and 700bar are used as the inlet pressure of the workpiece pressure reducing valve, and the pressure reducing valve is adjusted to a pressure value (≤10bar). Then, the mass flow controller at the outlet of the workpiece pressure reducing valve is used to adjust the outlet flow. The first pressure gauge is used to detect the change of the outlet pressure of the workpiece pressure reducing valve, and then the outlet pressure of the workpiece pressure reducing valve is controlled by the detection workpiece pressure reducing valve. The outlet flow is measured by the mass flow controller to obtain a series of pressure-flow corresponding point values, and an outlet pressure-flow curve is formed. Eight curves are drawn under eight inlet pressure conditions, and the eight curves are drawn in the same coordinate system. The outlet pressure of the workpiece pressure reducing valve is ≤10bar, the medium temperature is room temperature, and the flow range is: 0-2000mL / min.

[0037] Since the pressure and flow at the outlet of the pressure reducing valve change dynamically, the flow accuracy of the pressure reducing valve will also change as the outlet pressure accuracy changes. When testing the performance of the pressure reducing valve to be tested, when the outlet flow of the pressure reducing valve to be tested is adjusted to the upper limit value, a high-range first-stage pressure reducing valve should be selected, and when the outlet flow of the pressure reducing valve to be tested is adjusted to the lower limit value, it should be switched to a low-range second-stage pressure reducing valve through a bypass. That is, the device of this embodiment can select a suitable pressure regulating mechanism according to the set value of the outlet flow of the specific pressure reducing valve to be tested, so that the measured pressure and flow curves have high accuracy.

[0038] The device of this embodiment appropriately selects a specific hydrogen pipeline and a pressure reducing valve with a specific range according to the flow rate at the outlet of the pressure reducing valve to be tested, that is, the specific test requirements, thereby greatly improving the accuracy of the measured pressure and flow curves; and designs multiple automated pressure transmitters, controllers, and control circuits, thereby improving the automation level of the measurement system and saving manpower and material resources.

[0039] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A vehicle high-pressure hydrogen pressure reducing valve testing device, comprising a gas source and a hydrogen pipeline, a pressure regulating mechanism arranged on the hydrogen pipeline, a pressure reducing valve workpiece to be tested (PR121), a first pressure gauge (PT104) and a flow controller (FT101), It is characterized in that The hydrogen pipeline includes a main pipeline connected to the gas source and a bypass arranged on the main pipeline; the pressure regulating mechanism includes a switch valve (PAV101), a primary pressure reducing valve (PR101), a first hydrogen path switching valve (PAV102), a secondary pressure reducing valve (PR102) and a one-way valve (CV101) arranged in sequence on the main pipeline; a second hydrogen path switching valve (PAV103) is arranged on the bypass and is connected in parallel with the first hydrogen path switching valve (PAV102), the secondary pressure reducing valve (PR102) and the one-way valve (CV101); The pressure regulating range of the first pressure reducing valve (PR101) is 21-1000 bar, the pressure regulating range of the second pressure reducing valve (PR102) is 5-70 bar, a second pressure gauge (PT101) is connected to the main line between the gas source and the switch valve (PAV101), and a third pressure gauge (PT102) is connected to the bypass line on the intake side of the second hydrogen path switching valve (PAV103). It also includes a control mechanism, which includes a controller (1) connected to the first pressure gauge (PT104) and an electric valve connected to the controller (1); the controller (1) is connected to the electric valve circuit, and the electric valve is arranged on the drive gas source pipeline (2) of the switch valve (PAV101), the first pressure reducing valve (PR101), the first hydrogen path switching valve (PAV102), the second pressure reducing valve (PR102), and the second hydrogen path switching valve (PAV103); When in use, under a certain inlet pressure, the inlet pressure of the pressure reducing valve workpiece (PR121) to be tested is adjusted to a pressure value of ≤10bar, and then the flow controller (FT101) is used to control the outlet flow of the pressure reducing valve workpiece (PR121) to be tested, and the change of the outlet pressure of the pressure reducing valve workpiece (PR121) to be tested is detected. Then, the outlet pressure of the pressure reducing valve workpiece (PR121) to be tested is adjusted and controlled by the pressure reducing valve workpiece (PR121), and the flow controller (FT101) is used to detect the change of the outlet flow of the pressure reducing valve workpiece (PR121) to be tested, so as to measure the outlet pressure-flow curve.

2. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 1, It is characterized in that The outlet of the flow controller (FT101) is connected to the safety pressure relief valve (PRV101), and the outlet of the safety pressure relief valve (PRV101) is connected to the fourth pressure gauge (PT103).

3. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 2, It is characterized in that The switch valve (PAV101), the first hydrogen path switching valve (PAV102), the second hydrogen path switching valve (PAV103), the first pressure reducing valve (PR101), and the second pressure reducing valve (PR102) are all switch valves with pneumatic actuators; the first pressure gauge (PT104), the second pressure gauge (PT101), the third pressure gauge (PT102), and the fourth pressure gauge (PT103) are all pressure sensors.

4. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 1, It is characterized in that The electric valves provided on the driving gas sources of the switch valve (PAV101), the first hydrogen path switching valve (PAV102) and the second hydrogen path switching valve (PAV103) are high-pressure solenoid valves; the electric valves provided on the driving gas sources of the first-stage pressure reducing valve (PR101) and the second-stage pressure reducing valve (PR102) are electric regulating valves.

5. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 1, It is characterized in that A fifth pressure gauge is provided at the inlet of the pressure reducing valve workpiece (PR121) to be tested.

6. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 1, It is characterized in that The outlets of the first-stage pressure reducing valve (PR101) and the second-stage pressure reducing valve (PR102) are both matched and connected with safety valves.

7. A vehicle high-pressure hydrogen pressure reducing valve testing device according to claim 1, It is characterized in that The main pipe is provided with a filter (F101), and the gas source is connected to the inlet of the filter (F101); the flow controller (FT101) is a mass flow controller, and its adjustment range is 28~1400Ln / Min.

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