A method for medium-resistant weathering rack test of high-pressure gas pressure reducer

Abstract

This invention relates to the field of high-pressure gas pressure regulators and discloses a bench test method for the medium resistance and weather resistance of high-pressure gas pressure regulators, comprising the following steps: Step 1: Prepare the test piece, compressed air, and working medium; Step 2: Seal the high-pressure gas inlet, install a shut-off valve at the low-pressure gas outlet, and install an inlet / outlet solenoid valve and a pressure gauge at the MAP connector; install a miniature camera in the low-pressure chamber to capture the state of the test piece; Step 3: Introduce the working medium into the low-pressure chamber through the low-pressure gas outlet, and close the shut-off valve after reaching the specified pressure value; Step 4: Introduce compressed air into the test chamber, and begin the test after the test conditions are met, using the inflation and deflation of compressed air to achieve the movement of the tested piece; Step 5: Stop the test, open the shut-off valve, and release the working medium. Only a small amount of working gas is needed to make the test state close to the actual working state, improving the accuracy of the test results.

Description

Technical Field

[0001] This invention relates to the field of high-pressure gas pressure regulators, and more specifically to a bench test method for the resistance of high-pressure gas pressure regulators to media and weathering. Background Technology

[0002] A high-pressure gas pressure reducer is a device that reduces the pressure of high-pressure combustible gas in a vehicle-mounted gas cylinder to the low-pressure gas pressure required by a fuel cell or internal combustion engine. When the inlet pressure or outlet load changes, the regulator can automatically adjust to maintain the outlet pressure within the set range, thereby achieving the function of reducing pressure and stabilizing the outlet pressure.

[0003] In existing technologies, to test the reliability and stability of high-pressure gas pressure regulators, it is necessary to conduct media compatibility tests on the non-metallic components (including diaphragms) inside the pressure regulator (test component). This presents four problems: ① The media compatibility of the non-metallic components inside the pressure regulator is directly assessed by static pressurized immersion followed by microscopic observation and measurement of mass and volume changes. In this method, the diaphragm sample is in a static state, which differs greatly from the dynamic working state in actual operation and cannot reflect the media resistance characteristics under real-world usage scenarios. ② In traditional pressure regulator bench durability tests, compressed air is used instead of the working medium to simulate its working state. High-pressure compressed air is input at the pressure regulator inlet, and low-pressure gas meeting the rated output pressure is output at the pressure regulator outlet. In a laboratory environment, due to reasons such as test safety, test cost, test environmental protection, and test operability, it is difficult to use a sufficient amount of actual working medium for bench tests of individual pressure regulators. ③ Under high pressure and high flow rate, traditional testing methods make it difficult to visualize and monitor the failure process of seals in contact with the working medium, and it is impossible to observe the actual failure process and lack data support for failure analysis; ④ The composition and impurities of combustible gases such as natural gas vary greatly in my country and around the world, resulting in significant differences in compatibility with non-metallic parts. Under traditional component-level bench testing methods, it is difficult to identify the actual compatibility and weather resistance of non-metallic parts with the working medium. The pressure reducer can only be mounted on an engine bench or a vehicle for durability verification, which is very time-consuming and costly. Summary of the Invention

[0004] The present invention aims to provide a bench test method for the resistance to media and weathering of high-pressure gas pressure regulators, which requires only a small amount of working gas to make the test conditions close to the actual working conditions, thereby improving the accuracy of the test results.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a bench test method for the medium resistance and weather resistance of a high-pressure gas pressure reducer, wherein the test piece includes a housing, and the housing is provided with an elastic element, a diaphragm, a valve stem, and a valve plate. The housing is divided into a low-pressure chamber, a high-pressure chamber, and a test chamber. The elastic element is disposed in the test chamber. The diaphragm is used to separate the low-pressure chamber and the test chamber. The diaphragm drives the valve plate to move up and down through the valve stem, thereby controlling the flow rate between the low-pressure chamber and the high-pressure chamber through the valve plate. The test chamber is provided with a MAP connector, the low-pressure chamber is provided with a low-pressure gas outlet, and the high-pressure chamber is provided with a high-pressure gas inlet; the method includes the following steps:

[0006] Step 1: Prepare the test piece, compressed air, and working medium;

[0007] Step 2: Seal the high-pressure gas inlet, install a shut-off valve at the low-pressure gas outlet, and install a solenoid valve and pressure gauge at the MAP connector; install a miniature camera in the low-pressure chamber to capture images of the tested component's status.

[0008] Step 3: Input the working medium into the low-pressure chamber through the low-pressure gas outlet. After reaching the specified pressure value, close the shut-off valve.

[0009] Step 4: Introduce compressed air into the test chamber. Once the test conditions meet the requirements, begin the test.

[0010] Step 5: Stop the test, open the shut-off valve, and release the working medium;

[0011] Step 6: Open the solenoid valve to release the compressed air;

[0012] Step 7: Remove the miniature camera and extract the data.

[0013] The beneficial effects of this plan are:

[0014] 1. In the existing technology of high-pressure gas pressure regulators, high-pressure gas passes through the high-pressure gas inlet and the high-pressure chamber in sequence, and then passes through the valve plate to reduce pressure before entering the low-pressure chamber. When the pressure in the low-pressure chamber is too low, the elastic element presses down the diaphragm, and the diaphragm drives the valve plate to move downward through the valve stem, thereby increasing the flow rate of high-pressure gas. Conversely, when the pressure in the low-pressure chamber is too high, the gas in the low-pressure chamber pushes the diaphragm upward, and the diaphragm drives the valve plate to move upward through the valve stem, thereby reducing the flow rate of high-pressure gas. This is the existing technology and is similar to the principle of a pressure regulating valve.

[0015] In existing tests on the resistance to media and weathering of pressure regulator components, for ease of observation, non-metallic test components such as diaphragms are usually placed directly into pressurized gas for testing, rather than being installed inside the pressure regulator assembly for testing.

[0016] In this scheme, in order to make the test medium and the actual working medium closer, the low-pressure chamber is filled with gas that is consistent with the actual working state. However, since it is not an on-site test, the working gas that can be obtained is limited. Therefore, the working gas cannot be allowed to form a flow state to change the shape of the diaphragm at any time. Only the working gas in a closed state can be used, which can achieve the goal of requiring only a small amount of working gas.

[0017] 2. To make the diaphragm more closely resemble its dynamic state during operation rather than only allowing for static testing, this scheme introduces compressed air into the test chamber, enabling the diaphragm and valve stem to move up and down as they would during normal operation. While maintaining the internal assembly relationship and component condition of the pressure reducer without change, the contact state between the diaphragm and other non-metallic components in the pressure reducer and the working medium, as well as the actual working conditions, are completely consistent. This effectively complements traditional compatibility testing, avoiding the shortcomings of traditional compatibility testing where non-metallic components do not move, resulting in significant differences from actual operating conditions.

[0018] In actual operation, the test chamber is used to accommodate the elastic element and is not a separate chamber added in this solution. The MAP connector is the connector for the engine vacuum tube and is used to ensure that the test chamber is connected to the outside world.

[0019] 2. In the laboratory environment, the working medium in the low-pressure chamber is in a static and non-flowing state. The bench test system can accurately adjust, monitor and collect data on its pressure, and collect, save and analyze images of easily failed parts such as diaphragms in real time. This enables automatic monitoring of the entire test process, monitors the changes in failure modes, provides effective data support for failure analysis, reduces blind spots in the supervision of the test process, and reduces the labor intensity of test personnel.

[0020] 3. In the laboratory environment, the low-pressure working gas chamber of the high-pressure gas pressure reducer is filled with the working medium according to the specified pressure value. The working medium is retained in this chamber by a shut-off valve, so as to achieve a completely closed and lossless flammable working medium during the test, which greatly reduces the test cost and eliminates the risks to test safety and environmental protection.

[0021] 4. In the laboratory environment, the compressed air required for this bench test is from the factory's conventional gas source, and the working medium is the gaseous fuel used in the engine, both of which are readily available. More importantly, the composition and impurities of combustible gases such as natural gas vary greatly in my country and worldwide, resulting in significant differences in compatibility with non-metallic components. Traditional methods make it difficult to obtain sufficient quantities of working medium from end-users for laboratory verification. This testing method only requires collecting normally used working medium from the end-user and adding it to the low-pressure working gas chamber of the test piece, and the amount used is very small. This provides a low-cost and easily implemented solution for the global, off-site simulation verification of high-pressure gas pressure regulators for working media.

[0022] Furthermore, in step two, the venting pipeline is prepared. The solenoid valves include an intake solenoid valve, an exhaust solenoid valve, and a three-way pipe. The compressed air source, the intake solenoid valve, the three-way pipe, and the MAP connector are connected in sequence. The venting pipeline, the exhaust solenoid valve, and the three-way pipe are connected in sequence.

[0023] Furthermore, in step two, a light source is prepared and installed in the low-pressure chamber. The light source is used to illuminate the area captured by the miniature camera.

[0024] Furthermore, in step four, the test piece is placed in conventional testing equipment.

[0025] Furthermore, in step two, a first pressure gauge is installed between the tee and the MAP connector, and a second pressure gauge is installed between the shut-off valve and the low-pressure gas outlet.

[0026] Furthermore, in step four, after the test begins, the intake solenoid valve and exhaust solenoid valve are opened and closed cyclically, so that the test chamber is ventilated and vented at a prescribed rhythm to ensure that the diaphragm and valve stem conform to the actual working motion state.

[0027] Furthermore, in step five, if the tested component is found to have a defect as captured by the miniature camera, the test is paused, and after inspection and judgment, the test can be continued or terminated.

[0028] Furthermore, in step five, if the tested component is found to be defective as captured by the miniature camera, the test is paused when the value of the second pressure gauge is lower than the specified value. After investigating the factors causing the pressure drop, the test can be continued or terminated.

[0029] Furthermore, in step five, if the tested component captured by the miniature camera has no defects and the value of the second pressure gauge is higher than the specified value, the test is stopped when the number of opening and closing cycles of the intake solenoid valve and the exhaust solenoid valve reaches the specified requirement.

[0030] Furthermore, in step two, a controller is prepared, which is connected to the intake solenoid valve, the exhaust solenoid valve, the first pressure gauge, the second pressure gauge, the light source, and the miniature camera.

[0031] The controller is used to control the intake solenoid valve and the exhaust solenoid valve according to the first pressure gauge, so that the pressure in the compression chamber is the same as the pressure under the actual working condition.

[0032] The controller is used to control the brightness of the light source, thereby making the image from the miniature camera clearer.

[0033] This solution also has the following effects:

[0034] 1. The pressure inside the test chamber is changed by the intake solenoid valve and the exhaust solenoid valve. The pressure inside the test chamber is monitored by the first pressure gauge. The test chamber is repeatedly filled with air and exhausted, thereby realizing the dynamic change of the diaphragm by changing the pressure inside the test chamber.

[0035] 2. To ensure the strength of the casing, the casing is usually made of opaque material. Therefore, the light inside the casing is dim, and a light source needs to be added to facilitate the miniature camera to capture images. The intensity of the light source can be adjusted according to the actual situation.

[0036] 3. In this solution, the shell can be placed in any conventional testing equipment to obtain test conditions, such as high and low temperature environment and vibration environment. In the laboratory environment, the bench test system can be used with conventional testing equipment such as high and low temperature environment test chamber and vibration test bench. The high pressure gas pressure reducer can be used to carry out three comprehensive environmental tests on the test bench with actual working medium and motion state. Before being installed on the engine bench or vehicle durability verification, product risks can be identified in advance, reducing the test cycle and cost.

[0037] 4. In the existing technology, it is necessary to observe whether there is a defect in the tested component after the test is completed, and it is not clear when the defect will appear. The test time after the defect appears is meaningless. However, in this solution, the test is stopped immediately once the tested component has a defect, so the time when the defect appears can be determined, saving time and improving test efficiency.

[0038] 5. When the reading on the second pressure gauge is lower than the specified value, it indicates that there is a leak in the working gas. The test should be stopped immediately to prevent waste of working gas, save time, and improve efficiency. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of an embodiment;

[0040] Figure 2 This is a schematic diagram of the structure of an embodiment;

[0041] Figure 3 Flowchart for an embodiment; Detailed Implementation

[0042] The following detailed description illustrates the specific implementation method:

[0043] The reference numerals in the accompanying drawings include: housing 1, elastic element 11, diaphragm 12, valve stem 13, valve plate 14, low-pressure chamber 2, low-pressure gas outlet 21, high-pressure chamber 3, high-pressure gas inlet 31, test chamber 4, MAP connector 41, light source 51, miniature camera 52, inlet solenoid valve 61, exhaust solenoid valve 62, three-way pipe 63, first pressure gauge 71, second pressure gauge 72, plug 8, and shut-off valve 9.

[0044] Example

[0045] A bench test method for the medium resistance and weather resistance of a high-pressure gas pressure regulator includes a test piece comprising a housing 1. The housing 1 contains an elastic element 11, a diaphragm 12, a valve stem 13, and a valve plate 14. The elastic element 11 is a spring. The housing 1 is divided into a low-pressure chamber 2, a high-pressure chamber 3, and a test chamber 4. The elastic element 11 is disposed within the test chamber 4. The diaphragm 12 separates the low-pressure chamber 2 and the test chamber 4. The diaphragm 12 moves the valve plate 14 up and down via the valve stem 13, thereby controlling the flow rate between the low-pressure chamber 2 and the high-pressure chamber 3. The test chamber 4 is equipped with a MAP connector 41. The low-pressure chamber 2 has a low-pressure gas outlet 21, and the high-pressure chamber 3 has a high-pressure gas inlet 31. The tested components are the diaphragm and other easily failed parts within the test piece. A schematic diagram is shown below. Figure 1 As shown, the experimental inertial mounting structure diagram is as follows: Figure 2 As shown, the flowchart is as follows Figure 3 As shown, it includes the following steps:

[0046] Step 1: Prepare the test piece, compressed air, and working medium; the working medium is usually a combustible gas, such as natural gas.

[0047] Step 2: Prepare the controller, light source 51, image display, and venting pipeline. The solenoid valves include an intake solenoid valve 61, an exhaust solenoid valve 62, and a three-way pipe 63. The light source 51 is an LED light. Install the light source 51 in the low-pressure chamber 2. The light source 51 is used to illuminate the area captured by the miniature camera 52. Connect the compressed air source, intake solenoid valve 61, three-way pipe 63, and MAP connector 41 in sequence. Connect the venting pipeline, exhaust solenoid valve 62, and three-way pipe 63 in sequence. Seal the high-pressure gas inlet 31 with a plug 8. Install a shut-off valve 9 at the low-pressure gas outlet 21 and a solenoid valve at the MAP connector 41. Install the miniature camera 52 in the low-pressure chamber 2. The camera 52 is connected to the image display for signal transmission. The miniature camera 52 is used to capture the state of the diaphragm 12. A first pressure gauge 71 is installed between the three-way pipe 63 and the MAP connector 41, and a second pressure gauge 72 is installed between the shut-off valve 9 and the low-pressure gas outlet 21. The controller is electrically connected to the intake solenoid valve 61, the exhaust solenoid valve 62, the first pressure gauge 71, the second pressure gauge 72, the light source 51, and the miniature camera 52. The controller is used to control the intake solenoid valve 61 and the exhaust solenoid valve 62 according to the first pressure gauge 71, so that the pressure in the compression chamber is the same as the pressure under actual working conditions. The controller is used to control the brightness of the light source 51, so that the image of the miniature camera 52 is clearer.

[0048] Step 3: Input the working medium into the low-pressure chamber 2 through the low-pressure gas outlet 21, and close the shut-off valve 9;

[0049] Step 4: Introduce compressed air into test chamber 4. The pressure of the compressed air should be the same as that of the low-pressure gas chamber. The specific pressure value will vary depending on the product and should be determined according to the requirements of the test outline. Place the shell 1 in a conventional test equipment. Adjust the opening and closing cycle of the compressed air inlet solenoid valve 61 and the exhaust solenoid valve 62 according to the pressure value, test environment conditions, test cycle or number of cycles specified in the test outline. Adjust the temperature and humidity of the high and low temperature environment test chamber, the amplitude and frequency of the vibration table, and the voltage parameters of the controller. Turn on the LED light source 51 and the miniature camera 52 to monitor the pressure gauge pressure and the status of the image from the miniature camera 52 during the test. The conventional test equipment is a high and low temperature environment test chamber or a vibration test bench. After the test conditions meet the requirements, start the test by repeatedly opening and closing the inlet solenoid valve 61 and the exhaust solenoid valve 62, thereby allowing air to enter and exit test chamber 4 multiple times.

[0050] Step 5: If the tested component is found to have a defect as captured by the miniature camera 52, stop the test; if the tested component is found to have no defect as captured by the miniature camera 52, stop the test when the value of the second pressure gauge 72 is lower than the specified value; if the tested component is found to have no defect as captured by the miniature camera 52 and the value of the second pressure gauge 72 is higher than the specified value, stop the test when the number of opening and closing cycles of the intake solenoid valve 61 and the exhaust solenoid valve 62 reaches the specified requirement.

[0051] After the test is stopped, open the shut-off valve 9 to release the working medium;

[0052] Step 6: Open the exhaust solenoid valve 62 to release the compressed air; turn off the light source 51 and the miniature camera 52;

[0053] Step 7: Remove the miniature camera 52 and extract the data. Perform image feature analysis on the image transmitted from the miniature camera 52 to the image display. The miniature camera 52 and the image display use CAN communication and visualization image technology to collect images of gas pressure and easily failed parts in real time during the test process and monitor the change process of failure mode. Disassemble and inspect the performance, appearance and components of the light source 51 and the miniature camera 52.

[0054] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A medium-resistant weather-resistant rack test method for a high-pressure gas pressure reducer, the measured piece comprising a shell, an elastic piece, a diaphragm, a valve rod and a valve plate being arranged in the shell, the shell being divided into a low-pressure chamber, a high-pressure chamber and a test chamber, the elastic piece being arranged in the test chamber, the diaphragm being used to separate the low-pressure chamber and the test chamber, the diaphragm driving the valve plate to move up and down through the valve rod, thereby controlling the flow between the low-pressure chamber and the high-pressure chamber through the valve plate; the test chamber being provided with a MAP joint, the low-pressure chamber being provided with a low-pressure gas output port, and the high-pressure chamber being provided with a high-pressure gas input port; characterized in that, Includes the following steps: Step 1: Prepare the test piece, compressed air, and working medium; Step 2: Seal the high-pressure gas inlet, install a shut-off valve at the low-pressure gas outlet, and install a solenoid valve and pressure gauge at the MAP connector; install a miniature camera in the low-pressure chamber to capture images of the tested component's status. Step 3: Input the working medium into the low-pressure chamber through the low-pressure gas outlet. After reaching the specified pressure value, close the shut-off valve. Step 4: Introduce compressed air into the test chamber. Once the test conditions meet the requirements, begin the test. Step 5: Stop the test, open the shut-off valve, and release the working medium; Step 6: Open the solenoid valve to release the compressed air; Step 7: Remove the miniature camera and extract the data.

2. The bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 1, characterized in that: In step two, prepare the venting pipeline. The solenoid valves include an intake solenoid valve, an exhaust solenoid valve, and a three-way pipe. The compressed air source, intake solenoid valve, three-way pipe, and MAP connector are connected in sequence. The venting pipeline, exhaust solenoid valve, and three-way pipe are connected in sequence.

3. The bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 2, characterized in that: In step two, a light source is prepared and installed in the low-pressure chamber. The light source is used to illuminate the area captured by the miniature camera.

4. The bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 3, characterized in that: In step four, the test piece is placed in a conventional testing device.

5. The bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 4, characterized in that: In step two, a first pressure gauge is installed between the tee and the MAP connector, and a second pressure gauge is installed between the shut-off valve and the low-pressure gas outlet.

6. The bench test method for the resistance to medium and weathering of a high-pressure gas pressure regulator according to claim 5, characterized in that: In step four, after the test begins, the intake solenoid valve and exhaust solenoid valve are opened and closed cyclically, so that the test chamber is inlet and outlet at a prescribed rhythm to ensure that the diaphragm and valve stem conform to the actual working motion state.

7. The bench test method for the resistance to medium and weathering of a high-pressure gas pressure regulator according to claim 6, characterized in that: In step five, if the tested component is found to have a defect as captured by the miniature camera, the test is paused, and after inspection and judgment, the test can be continued or terminated.

8. The bench test method for the resistance to medium and weathering of a high-pressure gas pressure regulator according to claim 7, characterized in that: In step five, if the tested component is found to be defective as captured by the miniature camera, the test is paused when the value of the second pressure gauge is lower than the specified value. After investigating the factors causing the pressure drop, the test can be continued or terminated.

9. A bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 8, characterized in that: In step five, if the tested component is free of defects as captured by the miniature camera and the value of the second pressure gauge is higher than the specified value, the test is stopped when the number of opening and closing cycles of the intake solenoid valve and exhaust solenoid valve reaches the specified requirement.

10. A bench test method for the resistance to media and weathering of a high-pressure gas pressure regulator according to claim 9, characterized in that: In step two, prepare the controller, which is connected to the intake solenoid valve, exhaust solenoid valve, first pressure gauge, second pressure gauge, light source and miniature camera respectively; The controller is used to control the intake solenoid valve and the exhaust solenoid valve according to the first pressure gauge, so that the pressure in the test chamber is the same as the pressure under the actual working condition. The controller is used to control the brightness of the light source, thereby making the image from the miniature camera clearer.

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