Method and system for testing service life of pressure reducing valve of oxygen equipment

Abstract

The invention discloses a method and a system for testing the service life of a pressure reducing valve of oxygen equipment. The method comprises the following steps: setting a working load cycle and a temperature load cycle of the pressure reducing valve; wherein the working load cycle comprises single service life test cycle time and the working load cycle number of the service life test; the temperature load cycle comprises a temperature cycle consisting of a high-temperature section, a normal-temperature section and a low-temperature section; and carrying out a life test according to the working load cycles and the temperature load cycles, carrying out the temperature load cycles in each working load cycle, and detecting the performance of the pressure reducing valve, and comparing the performance with expected performance. The working load cycle and the temperature load cycle are simultaneously applied in the service life test of the pressure reducing valve, so that the actual use load of the pressure reducing valve can be more truly simulated, the performance of the pressure reducing valve is compared with an expected effect in each working load cycle, the service life and the performance of the pressure reducing valve of oxygen equipment can be more fully verified, and the test efficiency is improved. The verification reliability is improved, and the fault probability of the oxygen equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the field of oxygen equipment design, and particularly to a method and system for life test of a pressure reducing valve of an oxygen equipment. Background Art

[0002] The oxygen equipment is a chair-mounted oxygen source device, mainly composed of a gas cylinder and a pressure reducing valve. Its main function is to supply oxygen to users emergently; it has the ability to store high-pressure oxygen for a long time when the aircraft is in all states such as parking, taxiing, taking off, climbing, cruising, maneuvering, landing, etc.; it has the ability to fill oxygen on the aircraft, etc. Considering the oxygen supply time and the installation space available on the seat, the gas cylinder of the oxygen equipment stores high-pressure oxygen. The pressure reducing valve of the gas cylinder is connected to a cable and works in an emergency situation, and supplies oxygen to the user through an oxygen supply hose. Since the pressure reducing valve will experience stresses such as high and low temperatures, temperature changes, oxygen pressure, oxygen filling and discharging, and oxygen supply connection during storage and use, its performance and life have a direct impact on the oxygen equipment. Therefore, it is necessary to fully verify the life of the pressure reducing valve under the above conditions.

[0003] Currently, the general method for verifying the life of a pressure reducing valve is a single load application method, such as high and low temperature storage, temperature cycling, and oxygen filling and discharging operation test items. The test operation of a single load is relatively simple, but it cannot verify the working conditions where temperature changes and oxygen filling and discharging operations act on the product simultaneously under actual conditions. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a method and system for life test of a pressure reducing valve of an oxygen equipment, so as to verify the working conditions where temperature changes and oxygen filling and discharging operations act on the product simultaneously under actual conditions, and more fully verify the performance and life of the oxygen equipment.

[0005] For this purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a method for life test of a pressure reducing valve of an oxygen equipment, and the method includes:

[0007] Set the working load cycle and temperature load cycle of the pressure reducing valve; wherein, the working load cycle includes the single life test cycle time and the number of working load cycles of the life test; the temperature load cycle includes a temperature cycle composed of a high temperature section, a normal temperature section, and a low temperature section;

[0008] Conduct a life test according to the working load cycle and temperature load cycle, conduct a temperature load cycle in each working load cycle, and detect the performance of the pressure reducing valve and compare it with the expected performance.

[0009] According to the above solution, conducting a temperature load cycle in each working load cycle is specifically:

[0010] Divide the single-life test cycle time of the workload cycle into high-temperature section time, normal-temperature section time, and low-temperature section time, and perform inflation and deflation respectively during the high-temperature section time, normal-temperature section time, and low-temperature section time.

[0011] According to the above scheme, the number of workload cycles of the life test is calculated by dividing the sum of the total inflation time of the pressure reducing valve, the total deflation time of the pressure reducing valve, the total reset time of the switching mechanism, and the stabilization time of the pressure reducing valve by the single-life test cycle time.

[0012] According to the above scheme, the total inflation time of the pressure reducing valve is obtained by multiplying the single inflation time of the pressure reducing valve by the total number of operations of the pressure reducing valve; the total deflation time of the pressure reducing valve is obtained by multiplying the single deflation time of the pressure reducing valve by the total number of operations of the pressure reducing valve.

[0013] According to the above scheme, the high-temperature section time, normal-temperature section time, and low-temperature section time are set by the actual working time of the oxygen equipment in each temperature section.

[0014] According to the above scheme, the single inflation time of the pressure reducing valve, the single deflation time of the pressure reducing valve, the total number of operations of the pressure reducing valve, the total reset time of the switching mechanism, the stabilization time of the pressure reducing valve, the single-life test cycle time, the high-temperature limit value in the high-temperature section, and the low-temperature limit value in the low-temperature section are obtained by calibration.

[0015] According to the above scheme, the ratio of the inflation time to the deflation time in the high-temperature section time, normal-temperature section time, and low-temperature section time is the ratio of the total inflation time of the pressure reducing valve to the total deflation time of the pressure reducing valve.

[0016] According to the above scheme, nitrogen is used as the inflation and deflation gas for the life test.

[0017] The present invention also provides an oxygen equipment pressure reducing valve life test system, and the system includes:

[0018] A setting module for setting the workload cycle and temperature load cycle of the pressure reducing valve; wherein, the workload cycle includes the single-life test cycle time and the number of workload cycles of the life test; the temperature load cycle includes a temperature cycle composed of a high-temperature section, a normal-temperature section, and a low-temperature section;

[0019] A test module for performing tests according to the workload cycle and temperature load cycle, performing a temperature load cycle in each workload cycle, and detecting the performance of the pressure reducing valve and comparing it with the expected performance.

[0020] The present invention also provides a computer storage medium, which stores a computer program executable by a processor, and the computer program executes a method for testing the life of an oxygen equipment pressure reducing valve described above in the claims.

[0021] The beneficial effects of the present invention are as follows: By simultaneously applying a working load cycle and a temperature load cycle in the life test of the pressure reducing valve, the present invention can more realistically simulate the actual use load of the pressure reducing valve. And by comparing the performance of the pressure reducing valve with the expected effect in each working load cycle, the life and performance of the pressure reducing valve of the oxygen equipment can be more fully verified, the verification reliability can be increased, and the probability of failure of the oxygen equipment can be reduced.

[0022] Furthermore, by using clean and oil-free nitrogen instead of oxygen for the life test of the pressure reducing valve, the present invention avoids the danger caused by filling oxygen during the test process and ensures the safety of the life test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic flow chart of a method for the life test of a pressure reducing valve of an oxygen equipment according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the connection of the test equipment according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of the setting of the test procedure according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] To improve the deficiencies in the existing life verification method with a single load application method, which is relatively simple and cannot verify the working conditions where temperature changes and oxygen filling and discharging operations act on the product simultaneously in actual situations, an embodiment of the present invention proposes a method for the life test of a pressure reducing valve of an oxygen equipment, as Figure 1 shown, the method includes:

[0028] S1. Set the working load cycle and the temperature load cycle of the pressure reducing valve; wherein, the working load cycle includes the single life test cycle time and the number of working load cycles of the life test; the temperature load cycle includes a temperature cycle composed of a high temperature section, a normal temperature section and a low temperature section.

[0029] Specifically, the number of working load cycles n of the life test is calculated by dividing the sum of the total oxygen filling time T1, the total oxygen discharging time T2, the total reset time T3 of the switching mechanism and the stabilization time T4 of the pressure reducing valve by the single life test cycle time T, that is:

[0030] n = (T1 + T2 + T3 + T4) / T

[0031] Among them, the total charging time T1 of the pressure reducing valve is calculated by multiplying the single charging time t1 of the pressure reducing valve by the total number of working times N of the pressure reducing valve;

[0032] The total discharging time T2 of the pressure reducing valve is calculated by multiplying the single discharging time t2 of the pressure reducing valve by the total number of working times N of the pressure reducing valve.

[0033] S2. Conduct a life test according to the working load cycle and the temperature load cycle. Conduct a temperature load cycle in each working load cycle, and detect the performance of the pressure reducing valve and compare it with the expected performance.

[0034] Specifically, conducting a temperature load cycle in each working load cycle is specifically as follows:

[0035] Divide the single life test cycle time of the working load cycle into a high-temperature section time, a normal-temperature section time, and a low-temperature section time, and conduct charging and discharging respectively in the high-temperature section time, the normal-temperature section time, and the low-temperature section time.

[0036] Among them, the high-temperature section time, the normal-temperature section time, and the low-temperature section time are set according to the actual working time of the oxygen equipment in each temperature section.

[0037] In addition, the single charging time t1 of the pressure reducing valve, the single discharging time t2 of the pressure reducing valve, the total number of working times N of the pressure reducing valve, the total reset time T3 of the switching mechanism, the stabilization time T4 of the pressure reducing valve, the single life test cycle time T, the high-temperature limit value W in the high-temperature section 高 and the low-temperature limit value W in the low-temperature section 低 are all obtained through experimental calibration.

[0038] Among them, the ratio of the charging time to the discharging time in the high-temperature section time, the normal-temperature section time, and the low-temperature section time is the ratio of the total charging time of the pressure reducing valve to the total discharging time of the pressure reducing valve.

[0039] Among them, in this embodiment, the proportions of the high-temperature section time, the normal-temperature section time, and the low-temperature section time in each temperature load cycle are a:b:c respectively. Then the high-temperature section time is a(T1 + T2) / (a + b + c), the normal-temperature section time is b(T1 + T2) / (a + b + c), and the low-temperature section time is c(T1 + T2) / (a + b + c); in addition, charging and discharging are both carried out in each temperature section, and the ratio of the charging time to the discharging time in each temperature section is T1:T2.

[0040] In addition, since conducting tests by filling oxygen is somewhat dangerous, to reduce the test danger and ensure test safety, in the embodiments of the present invention, clean and oil-free nitrogen is used to replace oxygen for the test.

[0041] Based on a method for testing the life of a pressure reducing valve for an oxygen equipment according to an embodiment of the present invention, the specific steps of the life test of the pressure reducing valve for the oxygen equipment carried out in this embodiment are as follows:

[0042] like Figure 2 As shown, connect the pressure reducing valve to the pressure gauge and gas source and place it within the effective volume of the test chamber;

[0043] according to Figure 3 The temperature cycle and inflation and deflation time setting test procedures shown;

[0044] Start the test chamber and start timing after the temperature of the test piece stabilizes;

[0045] Start a working load cycle. At time 0, open valve 1 and valve 3, close valve 2, and fill nitrogen with a certain pressure from the oxygen filling port of the pressure reducing valve. The gas is discharged from valve 3. This cycle lasts until time D1, at which time the inflation and deflation are stopped, and the connecting mechanism works. Close valve 1 and valve 3, open valve 2, and fill nitrogen with a certain pressure from the gas cylinder interface of the pressure reducing valve. The oxygen supply hose of the pressure reducing valve is deflated. This cycle lasts until time D2, at which time the inflation and deflation are stopped and the connecting mechanism is reset. The period from time 0 to time D2 is the low temperature section W. 低 From time D2 to time D3, the temperature rises to the medium temperature W at a rate of m℃ / min. 中 , the connection mechanism is reset; where W 中 It is also obtained based on experimental calibration;

[0046] At time D3, valves 1 and 3 are opened, valve 2 is closed, and nitrogen gas of a certain pressure is filled in from the oxygen filling port of the pressure reducing valve, and the gas is discharged from valve 3. This continues until time D4, at which time the inflation and deflation are stopped, and the connecting mechanism works; valves 1 and 3 are closed, valve 2 is opened, and nitrogen gas of a certain pressure is filled in from the gas cylinder interface of the pressure reducing valve, and the oxygen supply hose of the pressure reducing valve is deflated. This continues until time D5, at which time the inflation and deflation are stopped and the connecting mechanism is reset. The period from time D3 to time D5 is the medium temperature section W 中 From D5 to D6, the temperature rises to the high temperature W at a rate of m℃ / min. 高 , the connection mechanism is reset;

[0047] At time D6, valves 1 and 3 are opened, valve 2 is closed, and nitrogen gas of a certain pressure is filled in from the oxygen filling port of the pressure reducing valve, and the gas is discharged from valve 3. This process continues until time D7, at which time the inflation and deflation are stopped, and the connecting mechanism is operated; valves 1 and 3 are closed, valve 2 is opened, and nitrogen gas of a certain pressure is filled in from the gas cylinder interface of the pressure reducing valve, and the oxygen supply hose of the pressure reducing valve is deflated. This process continues until time D8, at which time the inflation and deflation are stopped and the connecting mechanism is reset. The period from time D6 to time D8 is the high temperature section W 高 From time D8 to time T, the temperature drops to the medium temperature W at a rate of m℃ / min. 中 , the switching mechanism is reset, ending a working load cycle. At this time, after the temperature of the test piece stabilizes, the pressure reducing valve performance is tested and compared with the expected performance to verify the life of the pressure reducing valve;

[0048] Start the next working load cycle and repeat the above steps until n life test working load cycles are completed.

[0049] Specifically, when the switch-on mechanism is operated or reset, the inflation or deflation operation is stopped.

[0050] In addition, an embodiment of the present invention further provides an oxygen equipment pressure reducing valve life test system for implementing the oxygen equipment pressure reducing valve life test method described above in an embodiment of the present invention. The system comprises:

[0051] A setting module is used to set the working load cycle and temperature load cycle of the pressure reducing valve; wherein the working load cycle includes the single life test cycle time and the number of working load cycles of the life test; the temperature load cycle includes a temperature cycle consisting of a high temperature section, a normal temperature section, and a low temperature section;

[0052] The test module is used to perform tests based on working load cycles and temperature load cycles, perform temperature load cycles in each working load cycle, and detect the performance of the pressure reducing valve and compare it with the expected performance.

[0053] The various modules or mechanisms of the system are mainly used to implement the various steps of the above method embodiments, which will not be described in detail here.

[0054] In addition, an embodiment of the present invention further provides a computer storage medium storing a computer program executable by a processor, wherein the computer program executes a life test method for a pressure reducing valve of an oxygen equipment as described in the claims above.

[0055] The embodiments of the present invention provide a life test method and system for a pressure reducing valve of an oxygen equipment. By simultaneously applying a working load cycle and a temperature load cycle during the life test of the pressure reducing valve, the actual operating load of the pressure reducing valve can be more realistically simulated. This avoids the conventional method of testing the pressure reducing valve of an oxygen equipment by applying only a single load. By comparing the expected results after each working load cycle test, the life and performance of the pressure reducing valve of the oxygen equipment can be more fully verified, thereby increasing the reliability of the verification and reducing the probability of failure of the oxygen equipment.

[0056] Furthermore, the present invention uses clean, oil-free nitrogen instead of oxygen to perform the life test of the pressure reducing valve, thereby avoiding the danger caused by filling oxygen during the test and ensuring the safety of the life test.

[0057] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0058] The sequence numbers of the steps in the above embodiments do not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0059] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for testing the service life of a pressure reducing valve of an oxygen equipment, characterized in that, The method includes: Setting the working load cycle and temperature load cycle of the pressure reducing valve; wherein, the working load cycle includes the single - life - test cycle time and the number of working load cycles of the life test; the temperature load cycle includes a temperature cycle composed of a high - temperature section, a normal - temperature section, and a low - temperature section; Conducting a life test according to the working load cycle and temperature load cycle, conducting the temperature load cycle in each working load cycle, and detecting the performance of the pressure reducing valve and comparing it with the expected performance.

2. The method for testing the service life of a pressure reducing valve of an oxygen device according to claim 1, characterized in that Conducting the temperature load cycle in each working load cycle specifically means: Dividing the single - life - test cycle time of the working load cycle into a high - temperature section time, a normal - temperature section time, and a low - temperature section time, and conducting inflation and deflation respectively during the high - temperature section time, normal - temperature section time, and low - temperature section time.

3. A method for testing the service life of a pressure reducing valve of an oxygen device according to claim 1, characterized in that, The number of working load cycles of the life test is calculated by dividing the sum of the total inflation time of the pressure reducing valve, the total deflation time of the pressure reducing valve, the total reset time of the switching mechanism, and the stabilization time of the pressure reducing valve by the single - life - test cycle time.

4. A method for testing the life of a pressure reducing valve of an oxygen device according to claim 3, characterized in that, The total inflation time of the pressure reducing valve is obtained by multiplying the single - inflation time of the pressure reducing valve by the total number of operations of the pressure reducing valve; the total deflation time of the pressure reducing valve is obtained by multiplying the single - deflation time of the pressure reducing valve by the total number of operations of the pressure reducing valve.

5. A method for testing the life of a pressure reducing valve of an oxygen device according to claim 2, characterized in that, The high - temperature section time, normal - temperature section time, and low - temperature section time are set according to the actual working time of the oxygen equipment in each temperature section.

6. A method for testing the service life of a pressure reducing valve of an oxygen device according to claim 1 or 3 or 4, characterized in that, The single - inflation time of the pressure reducing valve, the single - deflation time of the pressure reducing valve, the total number of operations of the pressure reducing valve, the total reset time of the switching mechanism, the stabilization time of the pressure reducing valve, the single - life - test cycle time, the high - temperature limit of the high - temperature section, and the low - temperature limit of the low - temperature section are obtained by calibration.

7. A method for testing the service life of a pressure reducing valve of an oxygen device according to claim 2 or 3, characterized in that, The ratio of the inflation time to the deflation time in the high - temperature section time, normal - temperature section time, and low - temperature section time is the ratio of the total inflation time of the pressure reducing valve to the total deflation time of the pressure reducing valve.

8. A method for testing the service life of a pressure reducing valve of an oxygen device according to claim 1, characterized in that, Nitrogen is used as the inflation and deflation gas for the life test.

9. An oxygen equipment pressure reducing valve life test system, characterized in that, The system includes: A setting module for setting the working load cycle and temperature load cycle of the pressure reducing valve; wherein, the working load cycle includes the single - life - test cycle time and the number of working load cycles of the life test; the temperature load cycle includes a temperature cycle composed of a high - temperature section, a normal - temperature section, and a low - temperature section; A test module for conducting a test according to the working load cycle and temperature load cycle, conducting the temperature load cycle in each working load cycle, and detecting the performance of the pressure reducing valve and comparing it with the expected performance.

10. A computer storage medium, characterized in that, It stores a computer program executable by a processor, and this computer program executes a method for the life test of a pressure reducing valve of an oxygen equipment as described in any one of claims 1 - 8.

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