Medium-resistant and weather-resistant bench test method for high-pressure gas pressure reducer

Abstract

The invention relates to the field of high-pressure gas pressure reducers, and discloses a medium-resistant and weather-resistant bench test method for a high-pressure gas pressure reducer, which comprises the following steps: step 1, preparing a tested piece, compressed air and a working medium; 2, a high-pressure gas input port is plugged, a stop valve is installed at a low-pressure gas output port, and an air inlet and outlet electromagnetic valve and a pressure gauge are installed at an MAP connector; a micro camera is arranged in the low-pressure chamber and is used for shooting the state of the detected part; thirdly, the working medium is input into the low-pressure cavity through a low-pressure gas output port, and after the specified pressure value is reached, the stop valve is closed; step 4, compressed air is introduced into the test chamber, a test is started after test conditions meet regulations, and the movement of the verified part is realized through inflation and deflation of the compressed air; and 5, stopping the test, opening the stop valve, and releasing the working medium. The test state can be close to the actual working state only by a small amount of working gas, and the accuracy of the test result is improved.

Description

Technical Field

[0001] The invention relates to the field of high-pressure gas pressure reducers, and in particular to a medium resistance and weather resistance bench test method for high-pressure gas pressure reducers. Background Art

[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 keep the outlet pressure within the set range, thereby achieving the effect of reducing pressure and stabilizing the outlet pressure.

[0003] In the prior art, in order to test the reliability and stability of high-pressure gas pressure reducers, it is necessary to conduct a medium compatibility test on the non-metallic parts (including diaphragms) in the high-pressure gas pressure reducer (tested part). There are the following four problems: ① The medium compatibility of non-metallic parts in the high-pressure gas pressure reducer is directly determined by static pressure immersion, and then observed under a microscope, and the material is determined by measuring the mass and volume changes. In this way, the diaphragm sample of the pressure reducer is in a static state, which is very different from the dynamic working state during actual operation, and cannot reflect the medium resistance characteristics in the actual use scenario. ② In the traditional pressure reducer bench durability test, compressed air is used instead of the working medium to simulate its working state. High-pressure compressed air is input at the inlet of the pressure reducer, and low-pressure gas that meets the rated output pressure is output at the outlet of the pressure reducer. In the laboratory environment, it is difficult to use a sufficient amount of actual working medium to conduct a bench test of the pressure reducer unit due to reasons such as test safety, test cost, test environmental protection and test operability. ③ Under high pressure and high flow rate, it is difficult to visually monitor the failure process of seals in contact with the working medium using traditional test methods, and the actual failure process cannot be observed, lacking data support for failure analysis; ④ The composition and impurities contained in combustible gases such as natural gas in my country and around the world vary greatly, and the compatibility with non-metallic parts varies greatly. Under traditional component-level bench 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 the engine bench or the whole vehicle for durability verification, and the cycle and cost are very high. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer, wherein the tested part comprises a shell, an elastic part, a diaphragm, a valve stem and a valve plate are arranged in the shell, the shell is divided into a low-pressure chamber, a high-pressure chamber and a test chamber, the elastic part is arranged 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 between the low-pressure chamber and the high-pressure chamber through the valve plate; the test chamber is provided with a MAP joint, the low-pressure chamber is provided with a low-pressure gas output port, and the high-pressure chamber is provided with a high-pressure gas input port; the following steps are included:

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

[0007] Step 2: block the high-pressure gas input port, install a stop valve at the low-pressure gas output port, and install a solenoid valve and a pressure gauge at the MAP joint; install a micro camera in the low-pressure chamber to capture the state of the tested component;

[0008] Step 3: Input the working medium into the low-pressure chamber through the low-pressure gas outlet, and close the stop valve after the specified pressure value is reached;

[0009] Step 4: Pass compressed air into the test chamber and start the test after the test conditions meet the requirements;

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

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

[0012] Step 7: Take out the micro camera and extract the data.

[0013] The beneficial effects of this program are:

[0014] 1. In the prior art of high-pressure gas pressure reducers, high-pressure gas passes through the high-pressure gas inlet and the high-pressure chamber in turn, enters the valve plate to reduce pressure and enters the low-pressure chamber. When the pressure in the low-pressure chamber is too low, the elastic member presses down the diaphragm, and the diaphragm drives the valve plate to move downward through the valve stem, thereby increasing the flow rate of the high-pressure gas; conversely, when the pressure in the low-pressure chamber is too high, the gas in the low-pressure chamber pushes up the diaphragm, and the diaphragm drives the valve plate to move upward through the valve stem, thereby reducing the flow rate of the high-pressure gas. This is the prior art, which is similar to the principle of the pressure regulating valve.

[0015] In existing pressure reducer component-level media and weather resistance tests, for ease of observation, non-metallic test components such as diaphragms are usually directly placed in pressurized gas for testing rather than installing the test components in the pressure reducer 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 a gas consistent with the actual working state. However, since it is not a field test, the working gas available 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 working gas in a closed state can be used, which can achieve the goal of only requiring a small amount of working gas.

[0017] 2. In order to make the diaphragm closer to the dynamic state during operation rather than only static testing, compressed air is introduced into the test chamber in this scheme to enable the diaphragm and valve stem to move up and down as in the normal working state. While maintaining the internal assembly relationship and parts status of the pressure reducer unchanged, the contact state of the diaphragm and other non-metallic parts in the pressure reducer with the working medium and the actual working state are completely consistent, which forms a powerful complement to the traditional compatibility test and avoids the shortcomings of the traditional compatibility test that the non-metallic parts do not move and are greatly different from the actual working conditions.

[0018] In actual working state, the test chamber is used to accommodate elastic parts, and is not a chamber added separately in this scheme. The MAP connector is the connector of the engine vacuum tube, which is used to ensure the connection between the test chamber and 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 the images of the diaphragm and other parts prone to failure in real time, so as to realize automatic monitoring of the entire test process, monitor the change process of the failure mode, provide effective data support for failure analysis, reduce the blind spots of the test process supervision, and reduce the labor intensity of the test personnel.

[0020] 3. In the laboratory environment, the low-pressure working gas chambers in the high-pressure gas pressure reducer are filled with working medium according to the specified pressure value, and the working medium is retained in this chamber with a stop valve, so that the flammable working medium is fully enclosed and loss-free during the test, which greatly reduces the test cost and eliminates the risks of test safety and environmental protection.

[0021] 4. In the laboratory environment, the compressed air required for this bench test is the conventional gas source of the factory, and the working medium is the gas fuel used by the engine, which are both easy to obtain. More importantly, the composition and impurities contained in combustible gases such as natural gas in my country and around the world vary greatly, and the compatibility with non-metallic parts varies greatly. According to traditional methods, it is difficult to take enough working media from end users to the laboratory for verification. Under this test method, it is only necessary to collect the normally used working medium at the end user and add it to the low-pressure working gas chamber of the tested part, and the amount used is very small. This provides a low-cost and easy-to-implement solution for the global remote simulation verification of the working medium of the high-pressure gas pressure reducer.

[0022] Furthermore, in step two, an exhaust pipeline is prepared, the solenoid valve includes 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, and the exhaust pipeline, the exhaust solenoid valve and the three-way pipe are connected in sequence.

[0023] Furthermore, in step 2, a light source is prepared and installed in the low-pressure chamber, and the light source is used to illuminate the area photographed by the micro camera.

[0024] Furthermore, in step 4, the test piece is placed in a conventional test device.

[0025] Furthermore, in step 2, a first pressure gauge is installed between the tee and the MAP connector, and a second pressure gauge is installed between the stop valve and the low-pressure gas outlet.

[0026] Furthermore, in step 4, after the test is started, the air intake solenoid valve and the exhaust solenoid valve are opened and closed cyclically, so that the test chamber is filled with air and exhausted at a prescribed rhythm to ensure that the diaphragm and the valve stem meet the actual working motion state.

[0027] Furthermore, in step five, when the tested component photographed by the micro camera has defects, the test is suspended, and after inspection and determination, the test is continued or ended.

[0028] Furthermore, in step five, if there are no defects in the tested component photographed by the micro camera, when the value of the second pressure gauge is lower than the specified value, the test is suspended, and the factors causing the pressure drop are checked before continuing or ending the test.

[0029] Furthermore, in step five, if the tested component photographed by the micro 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 times of the intake solenoid valve and the exhaust solenoid valve reaches the specified requirements.

[0030] Furthermore, in step 2, a controller is prepared, and the controller is respectively connected to the intake solenoid valve, the exhaust solenoid valve, the first pressure gauge, the second pressure gauge, the light source and the micro camera;

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

[0032] The controller is used to control the brightness of the light source, so as to make the image of the micro camera clearer.

[0033] This solution also has the following effects:

[0034] 1. The pressure in the test chamber is changed by the air intake solenoid valve and the air exhaust solenoid valve, and the pressure in the test chamber is monitored by the first pressure gauge, so that the test chamber is repeatedly air-intaked and exhausted, thereby realizing the dynamic change of the diaphragm through the pressure change in the test chamber.

[0035] 2. To ensure the strength of the shell, the shell is usually made of opaque materials, so the light inside the shell is dim and an additional light source is needed to facilitate the micro camera to capture images. The intensity of the light source can be adjusted according to actual conditions.

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

[0037] 4. In the prior art, it is necessary to go back and observe whether there are defects in the tested component after the test is completed. It is not clear when the defect occurs, and the test time after the defect occurs is meaningless. However, in this solution, once the tested component has a defect, the test is stopped immediately, so the time when the defect occurs in the tested component can be determined, which saves time and improves test efficiency.

[0038] 5. When the value of the second pressure gauge is lower than the specified value, it means that there is a leakage of the working gas. The test should be stopped immediately to prevent waste of working gas, save time and improve efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0040] Figure 2 It is a structural schematic diagram of an embodiment;

[0041] Figure 3 is a flow chart of an embodiment; DETAILED DESCRIPTION

[0042] The following is further described in detail through specific implementation methods:

[0043] The figure marks in the drawings of the specification include: shell 1, elastic member 11, diaphragm 12, valve stem 13, valve plate 14, low-pressure chamber 2, low-pressure gas output port 21, high-pressure chamber 3, high-pressure gas input port 31, test chamber 4, MAP connector 41, light source 51, micro camera 52, intake solenoid valve 61, exhaust solenoid valve 62, three-way pipe 63, first pressure gauge 71, second pressure gauge 72, plug 8, stop valve 9.

[0044] Example

[0045] A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer, wherein the tested part comprises a shell 1, wherein an elastic part 11, a diaphragm 12, a valve stem 13 and a valve plate 14 are arranged in the shell 1, wherein the elastic part 11 is a spring, and the shell 1 is divided into a low-pressure chamber 2, a high-pressure chamber 3 and a test chamber 4, wherein the elastic part 11 is arranged in the test chamber 4, and the diaphragm 12 is used to separate the low-pressure chamber 2 and the test chamber 4, wherein the diaphragm 12 drives the valve plate 14 to move up and down through the valve stem 13, thereby controlling the flow between the low-pressure chamber 2 and the high-pressure chamber 3 through the valve plate 14; the test chamber 4 is provided with a MAP connector 41, the low-pressure chamber 2 is provided with a low-pressure gas output port 21, and the high-pressure chamber 3 is provided with a high-pressure gas input port 31, and the tested part is the diaphragm and other parts susceptible to failure in the tested part; the schematic diagram is as follows Figure 1 As shown, the test inertia installation structure diagram is as follows Figure 2 As shown in the flow chart, Figure 3 As shown, the following steps are included:

[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 exhaust pipeline. The solenoid valve includes an intake solenoid valve 61, an exhaust solenoid valve 62, and a three-way pipe 63. The light source 51 is an LED lamp. The light source 51 is installed in the low-pressure chamber 2. The light source 51 is used to illuminate the area photographed by the micro camera 52; the compressed air source, the intake solenoid valve 61, the three-way pipe 63 and the MAP connector 41 are connected in sequence, and the exhaust pipeline, the exhaust solenoid valve 62 and the three-way pipe 63 are connected in sequence; use the plug 8 to block the high-pressure gas input port 31, install the stop valve 9 at the low-pressure gas output port 21, and install the solenoid valve at the MAP connector 41; install the micro camera 52 in the low-pressure chamber 2, and connect the micro camera The controller 52 is connected to the image display signal, and the micro camera 52 is used to shoot 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 stop valve 9 and the low-pressure gas output port 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 micro camera 52 respectively; 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 of the compression chamber is the same as the pressure of the actual working state; the controller is used to control the brightness of the light source 51, so that the image of the micro 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 stop valve 9;

[0049] Step 4, pass compressed air into the test chamber 4, the pressure of the test compressed air is consistent with the pressure of the low-pressure gas chamber, the specific pressure value varies according to different products, and is carried out in accordance with the requirements of the test outline; put the shell 1 into the conventional test equipment, and adjust the opening and closing cycle of the compressed air intake 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 box, the amplitude and frequency of the vibration table, and the voltage parameters of the controller, turn on the LED light source 51 and the micro camera 52, and monitor the pressure of the pressure gauge and the state of the image of the micro camera 52 during the test; the conventional test equipment is a high and low temperature environment test box or a vibration test table; start the test after the test conditions meet the requirements, open and close the intake solenoid valve 61 and the exhaust solenoid valve 62 multiple times, so that the test chamber 4 is repeatedly inhaled and exhausted;

[0050] Step 5: When the tested component photographed by the micro camera 52 has defects, the test is stopped; if the tested component photographed by the micro camera 52 does not have defects, when the value of the second pressure gauge 72 is lower than the specified value, the test is stopped; if the tested component photographed by the micro camera 52 does not have defects and the value of the second pressure gauge 72 is higher than the specified value, when the number of opening and closing times of the intake solenoid valve 61 and the exhaust solenoid valve 62 reaches the specified requirements, the test is stopped;

[0051] After stopping the test, open the stop 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 micro camera 52;

[0053] Step 7: Take out the micro camera 52 and extract data, perform image feature analysis on the image transmitted by the micro camera 52 to the image display. The micro camera 52 and the image display use CAN communication and visual imaging technology to collect real-time images of the gas pressure and the parts prone to failure during the test, and monitor the change process of the failure mode; disassemble and inspect the performance, appearance and components of the light source 51 and the micro camera 52.

[0054] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer, wherein the tested part comprises a shell, in which an elastic part, a diaphragm, a valve stem and a valve plate are arranged, and the shell is divided into a low-pressure chamber, a high-pressure chamber and a test chamber, wherein the elastic part is arranged in the test chamber, and the diaphragm is used to separate the low-pressure chamber and the test chamber, and the diaphragm drives the valve plate to move up and down through the valve stem, thereby controlling the flow between the low-pressure chamber and the high-pressure chamber through the valve plate; the test chamber is provided with a MAP joint, the low-pressure chamber is provided with a low-pressure gas output port, and the high-pressure chamber is provided with a high-pressure gas input port; characterized in that, The following steps are involved: Step 1: Prepare the test piece, compressed air and working medium; Step 2: block the high-pressure gas input port, install a stop valve at the low-pressure gas output port, and install a solenoid valve and a pressure gauge at the MAP joint; install a micro camera in the low-pressure chamber to capture the state of the component under test; Step 3: Input the working medium into the low-pressure chamber through the low-pressure gas outlet, and close the stop valve after the specified pressure value is reached; Step 4: Pass compressed air into the test chamber and start the test after the test conditions meet the requirements; Step 5: Stop the test, open the stop valve and release the working medium; Step 6: Open the solenoid valve to release the compressed air; Step 7: Take out the micro camera and extract the data.

2. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 1, characterized in that: In step 2, prepare the exhaust pipeline, the solenoid valve includes 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, and the exhaust pipeline, the exhaust solenoid valve and the three-way pipe are connected in sequence.

3. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 2, characterized in that: In step 2, a light source is prepared and installed in the low-pressure chamber. The light source is used to illuminate the area photographed by the micro camera.

4. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 3, characterized in that: In step 4, the test piece is placed in a conventional test device.

5. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 4, characterized in that: In step 2, a first pressure gauge is installed between the tee and the MAP connector, and a second pressure gauge is installed between the stop valve and the low-pressure gas outlet.

6. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 5, characterized in that: In step 4, after the test starts, the air intake solenoid valve and the exhaust solenoid valve are opened and closed cyclically, so that the test chamber is filled with air and exhausted at a prescribed rhythm to ensure that the diaphragm and the valve stem meet the actual working motion state.

7. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 6, characterized in that: In step five, when the tested component photographed by the micro camera has defects, the test is suspended, and after inspection and judgment, the test is continued or ended.

8. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 7, characterized in that: In step five, if the tested component photographed by the micro camera has no defects and the value of the second pressure gauge is lower than the specified value, the test is suspended, and the factors causing the pressure drop are checked before continuing or ending the test.

9. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 8, characterized in that: In step five, if the tested component photographed by the micro 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 times of the intake solenoid valve and the exhaust solenoid valve reaches the specified requirements.

10. A bench test method for medium resistance and weather resistance of a high-pressure gas pressure reducer according to claim 9, characterized in that: In step 2, a controller is prepared, and the controller is respectively connected to the intake solenoid valve, the exhaust solenoid valve, the first pressure gauge, the second pressure gauge, the light source and the micro camera; The controller is used to control the air intake solenoid valve and the exhaust solenoid valve according to the first pressure gauge, so that the pressure of the compression chamber is the same as the pressure in the actual working state; The controller is used to control the brightness of the light source, so as to make the image of the micro camera clearer.

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