A test method for a high-speed electric pump immersed in hydrogen peroxide

Abstract

The present invention provides a method for testing a high-speed electric pump immersed in hydrogen peroxide, comprising the following steps: testing the electric pump's phase resistance, insulation resistance, and dielectric strength; verifying the electric pump's appearance and dimensions; testing the electric pump's speed; and maintaining pressure and performance in the electric pump's pipelines. By measuring the electric pump's interphase and insulation resistance, the present invention ensures the product's insulation reliability in advance, effectively preventing products with substandard insulation. A simple liquid flow test system not only verifies the pressure maintenance of the electric pump system's pipelines before testing, effectively preventing mechanical interface sealing failures, but also enables comprehensive performance testing of the electric pump using hydrogen peroxide media, addressing the issue of hydrogen peroxide's easy decomposition and explosion, and ensuring the safety of hydrogen peroxide media testing.

Description

Technical Field

[0001] The present invention relates to a method for testing a high-speed electric pump internally immersed in hydrogen peroxide, belonging to the technical field of high-speed electric pump testing in easily decomposable and corrosion-resistant extreme environments, and specifically to a method for testing a high-speed electric pump internally immersed in a hydrogen peroxide medium (highly corrosive and easily decomposed and exploded at high temperatures) in the field of rocket engines. Background Art

[0002] With the advent of the all-electric drive era, my country's aerospace rocket engines have recently begun developing highly efficient, lightweight electric pumps for all-electric drive. These pumps are primarily used in the engine's fuel delivery system to pump fuel. Compared to traditional compression rocket engine systems, pump-type systems are lighter and more powerful, simplifying the engine system structure and making variable operating condition adjustment easier. The absence of thermal components exposed to high temperatures gives electric pump-type rocket engines advantages in terms of size, volume, weight, and reliability.

[0003] Hydrogen peroxide is a colorless, transparent, liquid inorganic peroxide. High-concentration hydrogen peroxide is gaining increasing attention as a fuel propellant due to its low toxicity, environmental friendliness, and high yield. However, its greatest drawback is its inherent instability. When exposed to light, metal impurities, or alkaline conditions, it decomposes violently to produce water and oxygen, releasing heat. If the heat released is high enough, the reaction becomes uncontrollable and can lead to explosion.

[0004] The rocket engine uses a high-speed electric pump as its power source. The motor and pump utilize an integrated design, with the motor and pump coaxial. The motor drives the pump's impeller at high speed, thereby driving the medium flow and converting electrical energy into high-pressure, high-speed fluid kinetic energy, enabling the rocket engine's fuel delivery. The entire design eliminates the need for high-speed rotating dynamic seals, effectively eliminating the risk of medium segregation caused by localized high temperatures caused by friction pairs. This improves the efficiency of similar electric pumps by 5 percentage points, making it the first hydrogen peroxide electric pump developed in China.

[0005] To date, most electric pumps used in aviation, aerospace, and industrial technology operate in environments with relatively stable media and low rotational speeds (below 20,000 rpm). They serve only as auxiliary circulation systems and are rarely used in the main engine system. Unlike these electric pumps, hydrogen peroxide electric pumps not only have their rotors completely immersed in a highly concentrated hydrogen peroxide medium, but they also rotate at high speeds, reaching speeds of up to 40,000 rpm. Furthermore, their performance must be tested in this operating environment. While there is a wealth of research on electric pumps both domestically and internationally, few studies have examined electric pumps fully immersed in hydrogen peroxide and rotating at high speeds. Furthermore, there are no reports on testing methods for electric pumps in this extreme environment. Summary of the Invention

[0006] To solve the above technical problems, the present invention provides a high-speed electric pump testing method with internal immersion in hydrogen peroxide. This high-speed electric pump testing method with internal immersion in hydrogen peroxide addresses the shortcomings and gaps in existing testing technologies. It can test the performance of hydrogen peroxide electric pump products that are prone to decomposition and explosion in extreme environments, thereby improving product reliability.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a method for testing a high-speed electric pump with its interior immersed in hydrogen peroxide, comprising the following steps:

[0009] ① Test the interphase resistance, insulation resistance, and insulation dielectric strength of the electric pump during assembly. If the test passes, proceed to step ②. Otherwise, the electric pump product fails.

[0010] ② Check the appearance of the assembled electric pump and review the dimensions. If the requirements are met, proceed to step ③. Otherwise, the electric pump product is unqualified.

[0011] ③ Carry out speed test on the electric pump. If the test result meets the design range requirements, proceed to step ④. Otherwise, the electric pump product fails to meet the requirements.

[0012] ④Perform performance test on the electric pump.

[0013] The step ① is divided into the following steps:

[0014] (1.1) Test of interphase resistance: Use a microresistance meter to measure, clamp pin 1 and pin 2 on any two phases of the winding, and obtain the interphase resistance. If the test result meets the design range requirements, proceed to step (1.2), otherwise the electric pump product fails to meet the requirements;

[0015] (1.2) Insulation resistance test: Use an ohmmeter to test the insulation performance of the motor. If the insulation resistance between the motor stator winding and the housing is greater than 1000MΩ, it meets the design requirements and proceeds to step (1.3). Otherwise, the electric pump product is unqualified.

[0016] (1.3) Test of insulation dielectric strength: Use a voltage tester to check. Apply an AC voltage of 50Hz and 1540V RMS voltage between the windings of the electric pump. Then test the insulation resistance according to step (1.2). If there is no arcing, sparking or breakdown during the entire test process, the leakage current is not greater than 5mA, and the insulation resistance between the tested motor stator winding and the housing is greater than 1000MΩ, then the design requirements are met and proceed to step ②. Otherwise, the electric pump product is unqualified.

[0017] In the step (1.1), when the ambient temperature is not 20°C during detection, the conversion is performed using the formula:

[0018] R t =R 20 ×[1+0.0038×(t-20)]

[0019] Among them, R t is the resistance when the ambient temperature is t, R 20 is the resistance when the ambient temperature is 20℃, and t is the ambient temperature.

[0020] In the step (1.2), a 1000V megohmmeter is used to test the insulation resistance between the winding and the housing, and all output terminals of the electrical connector are combined for testing.

[0021] In the step (1.3), the voltage is increased uniformly at a rate of not less than 500 V / s from 0 V to 1540 V, maintained at 1540 V for 1 minute, and then gradually decreased to 0 V.

[0022] The step ② is divided into the following steps:

[0023] (2.1) Check the appearance of the electric pump. If it meets the design requirements, proceed to step (2.2). Otherwise, the electric pump product is unqualified.

[0024] (2.2) Review the external dimensions and use measuring tools that can ensure the dimensional accuracy requirements to check the installation dimensions of the external dimensions. If the design requirements are met, proceed to step ③. Otherwise, the electric pump product will be unqualified.

[0025] In the above step (2.1), the appearance must meet the following conditions:

[0026] a. The surface of the electric pump shall be free of rust, burrs, oil stains, bumps, scratches and peeling of coating;

[0027] b. The fasteners are firmly connected and have no defects;

[0028] c. The nameplate logo is clear and correct;

[0029] d. The pins inside the socket are not bent;

[0030] e. The correspondence between the model, installation position and marking of the socket with the same key position should comply with the requirements of the appearance drawing.

[0031] The step ③ is divided into the following steps:

[0032] (3.1) Remove the pump head of the electric pump and attach reflective paper to the motor shaft of the electric pump. Adjust the controller to make the motor operate under rated conditions. Use an infrared speed meter to measure the actual speed of the electric pump motor by pointing it at the reflective paper on the motor shaft.

[0033] (3.2) If the tolerance between the measured motor speed and the speed required by the electric pump design is ±2%, proceed to step ④; otherwise, the electric pump product is unqualified.

[0034] The step ④ is divided into the following steps:

[0035] (4.1) Install the electric pump on the test bench and perform a sealing and pressure test on the entire piping system. If the test passes, proceed to step (4.2). Otherwise, the electric pump product fails.

[0036] (4.2) The electric pump installed on the test bench is connected to the liquid circuit test system, and the hydrogen peroxide medium is added to the entire system. The electric pump maintains a constant motor speed and controls the valve opening after the pump to achieve load flow control. The parameters are tested using pressure sensors and flow sensors before and after the pump. If the tested pressure and flow after the pump are within the design range, the performance test is passed. Otherwise, the electric pump product fails.

[0037] In the step (4.1), during the entire pressure maintaining process, the data of the pressure gauge and the pressure sensor in front of the pump remain consistent, maintaining the value at 0.8 MPa, the pressure maintaining time is 10 minutes, and the pressure drop does not exceed 0.01 MPa, which meets the requirements of the electric pump system pipeline sealing pressure maintaining test.

[0038] The beneficial effects of the present invention are:

[0039] 1. By measuring the interphase resistance and insulation resistance of the electric pump, the insulation reliability of the product can be guaranteed in advance, effectively eliminating products with substandard insulation;

[0040] 2. The simple liquid flow test system can not only verify the pressure maintenance of the electric pump system pipeline before testing, effectively avoiding mechanical interface sealing failures, but also achieve comprehensive coverage of electric pump performance testing of hydrogen peroxide media, solving the problem of hydrogen peroxide's easy decomposition and explosion, and ensuring the safety of hydrogen peroxide media testing;

[0041] 3. The hydrogen peroxide electric pump flow test bench has the characteristics of high safety, high stability and high sensitivity. The equipment has high testing accuracy and is easy to operate and maintain. It outputs stable power to the test electric pump through the control equipment. The performance data of the electric pump is tested under different working conditions, and the test data is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of the present invention;

[0043] Figure 2 It is a schematic diagram of the connection structure of the hydrogen peroxide electric pump liquid flow test system of the present invention. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0045] Example 1

[0046] like Figure 1 As shown, a high-speed electric pump test method with internal immersion in hydrogen peroxide includes the following steps:

[0047] ① Test the interphase resistance, insulation resistance, and insulation dielectric strength of the electric pump during assembly. If the test passes, proceed to step ②. Otherwise, the electric pump product fails.

[0048] ② Check the appearance of the assembled electric pump and review the dimensions. If the requirements are met, proceed to step ③. Otherwise, the electric pump product is unqualified.

[0049] ③ Carry out speed test on the electric pump. If the test result meets the design range requirements, proceed to step ④. Otherwise, the electric pump product fails to meet the requirements.

[0050] ④Perform performance test on the electric pump.

[0051] The step ① is divided into the following steps:

[0052] (1.1) Test of interphase resistance: Use a microresistance meter to measure, clamp pin 1 and pin 2 on any two phases of the winding, and obtain the interphase resistance. If the test result meets the design range requirements, proceed to step (1.2), otherwise the electric pump product fails to meet the requirements;

[0053] (1.2) Insulation resistance test: Use an ohmmeter to test the insulation performance of the motor. If the insulation resistance between the motor stator winding and the housing is greater than 1000MΩ, it meets the design requirements and proceeds to step (1.3). Otherwise, the electric pump product is unqualified.

[0054] (1.3) Test of insulation dielectric strength: Use a voltage tester to check. Apply an AC voltage of 50Hz and 1540V RMS voltage between the windings of the electric pump. Then test the insulation resistance according to step (1.2). If there is no arcing, sparking or breakdown during the entire test process, the leakage current is not greater than 5mA, and the insulation resistance between the tested motor stator winding and the housing is greater than 1000MΩ, then the design requirements are met and proceed to step ②. Otherwise, the electric pump product is unqualified.

[0055] In the step (1.1), when the ambient temperature is not 20°C during detection, the conversion is performed using the formula:

[0056] R t =R 20 ×[1+0.0038×(t-20)]

[0057] Among them, Rt is the resistance when the ambient temperature is t, R 20 is the resistance when the ambient temperature is 20℃, and t is the ambient temperature.

[0058] In the step (1.2), a 1000V megohmmeter is used to test the insulation resistance between the winding and the housing, and all output terminals of the electrical connector are combined for testing.

[0059] In the step (1.3), the voltage is increased uniformly at a rate of not less than 500 V / s from 0 V to 1540 V, maintained at 1540 V for 1 minute, and then gradually decreased to 0 V.

[0060] The step ② is divided into the following steps:

[0061] (2.1) Check the appearance of the electric pump. If it meets the design requirements, proceed to step (2.2). Otherwise, the electric pump product is unqualified.

[0062] (2.2) Review the external dimensions and use measuring tools that can ensure the dimensional accuracy requirements to check the installation dimensions of the external dimensions. If the design requirements are met, proceed to step ③. Otherwise, the electric pump product will be unqualified.

[0063] In the above step (2.1), the appearance must meet the following conditions:

[0064] a. The surface of the electric pump shall be free of rust, burrs, oil stains, bumps, scratches and peeling of coating;

[0065] b. The fasteners are firmly connected and have no defects;

[0066] c. The nameplate logo is clear and correct;

[0067] d. The pins inside the socket are not bent;

[0068] e. The correspondence between the model, installation position and marking of the socket with the same key position should comply with the requirements of the appearance drawing.

[0069] The step ③ is divided into the following steps:

[0070] (3.1) Remove the pump head of the electric pump and attach reflective paper to the motor shaft of the electric pump. Adjust the controller to make the motor operate under rated conditions. Use an infrared speed meter to measure the actual speed of the electric pump motor by pointing it at the reflective paper on the motor shaft.

[0071] (3.2) If the tolerance between the measured motor speed and the speed required by the electric pump design is ±2%, proceed to step ④; otherwise, the electric pump product is unqualified.

[0072] The step ④ is divided into the following steps:

[0073] (4.1) Install the electric pump on the test bench and perform a sealing and pressure test on the entire piping system. If the test passes, proceed to step (4.2). Otherwise, the electric pump product fails.

[0074] (4.2) The electric pump installed on the test bench is connected to the liquid circuit test system, and the hydrogen peroxide medium is added to the entire system. The electric pump maintains a constant motor speed and controls the valve opening after the pump to achieve load flow control. The parameters are tested using pressure sensors and flow sensors before and after the pump. If the tested pressure and flow after the pump are within the design range, the performance test is passed. Otherwise, the electric pump product fails.

[0075] In the step (4.1), during the entire pressure maintaining process, the data of the pressure gauge and the pressure sensor in front of the pump remain consistent, maintaining the value at 0.8 MPa, the pressure maintaining time is 10 minutes, and the pressure drop does not exceed 0.01 MPa, which meets the requirements of the electric pump system pipeline sealing pressure maintaining test.

[0076] Example 2

[0077] Based on the technical solution of Example 1, and:

[0078] Step 1: First, conduct phase resistance, insulation resistance, and insulation dielectric strength tests on the electric pump during assembly. If the test passes, proceed to step 2. Otherwise, if the test fails, the electric pump product is unqualified.

[0079] Step 2: Check the appearance of the assembled electric pump and review the dimensions. If the requirements are met, proceed to step 3. If not, the electric pump product is unqualified.

[0080] Step 3: Then conduct a speed test on the electric pump. If the test result meets the design range requirements, proceed to step 4. Otherwise, the electric pump product is unqualified.

[0081] Step 4: Finally, conduct the electric pump performance test:

[0082] 4.1. Install the electric pump on the test bench and conduct a sealing and pressure test on the entire piping system. If the test passes, proceed to step 4.2. Otherwise, the electric pump product is unqualified.

[0083] 4.2. Connect the electric pump installed on the test bench to the fluid circuit test system and fill the entire system with hydrogen peroxide. By maintaining a constant motor speed and controlling the valve opening after the pump, the on-load flow rate is controlled. Pressure and flow sensors before and after the pump are used to test parameters. If the pressure and flow after the pump are within the designed range, the test passes; otherwise, the electric pump product fails.

[0084] Test method for step 1 above:

[0085] 1.1 Phase-to-phase resistance test

[0086] According to the definition of internal windings in the electrical interface, use a micro-resistance meter to measure, with pins 1 and 2 clamping any two phases of the winding. The test can be performed with the plug in, but the effect of the plug resistance needs to be considered.

[0087] When the ambient temperature is not 20°C during testing, the conversion is performed according to formula (1).

[0088] R t =R 20 ×[1+0.0038×(t-20)]·····················(1)

[0089] Where:

[0090] t—ambient temperature, °C;

[0091] R t —Resistance at ambient temperature t, Ω;

[0092] R 20 —Resistance at an ambient temperature of 20°C, Ω.

[0093] If the phase-to-phase resistance test results meet the design range requirements, proceed to the 1.2 insulation resistance test step; otherwise, the electric pump product is unqualified.

[0094] 1.2 Insulation resistance test

[0095] When testing the insulation resistance between the winding and the housing using a 1000V megohmmeter, connect all output terminals of the electrical connector together. This test can be performed with the plug connected. When testing the motor's insulation performance using a 1000V megohmmeter, if the insulation resistance between the motor's stator winding and the housing is greater than 1000MΩ, which meets the design requirements, proceed to the insulation dielectric strength test in step 1.3. Otherwise, the electric pump product fails the test.

[0096] 1.3 Test of insulation dielectric strength

[0097] The insulation dielectric strength test method and steps are as follows:

[0098] Use a withstand voltage tester to test the insulation dielectric strength of the electric pump by applying an AC voltage of 50Hz and a root mean square voltage of 1540V between the windings. The voltage is increased uniformly from 0V to 1540V at a rate of not less than 500V / s, maintained at 1540V for 1 minute, and then gradually reduced to 0V.

[0099] After the test, check the insulation resistance again according to the test method in 1.2 Insulation Resistance.

[0100] The test results should meet the requirements that there is no arcing, sparking or breakdown during the entire test process, the leakage current is no more than 5mA (leakage current greater than 5mA is considered to be breakdown); and the insulation resistance between the tested motor stator winding and the casing is greater than 1000MΩ, which meets the design requirements. Then step two can be carried out, otherwise the electric pump product is unqualified.

[0101] Test method for step 2 above:

[0102] 2.1 Visually inspect the appearance of the electric pump.

[0103] The appearance should meet the following requirements:

[0104] The surface of the electric pump should be free of rust, burrs, oil stains, bumps, scratches, and peeling of the coating;

[0105] Fastener connections should be firm and without defects;

[0106] The words on the nameplate should be clear and correct;

[0107] The pins in the socket are not bent;

[0108] The correspondence between the models, installation positions and markings of different key sockets should comply with the requirements of the appearance drawing.

[0109] If the appearance inspection results meet the design requirements, then step 2.2 of reviewing the external dimensions can be carried out; otherwise, the electric pump product is unqualified.

[0110] 2.2 Review of dimensions

[0111] Use a measuring tool that ensures dimensional accuracy to check the installation dimensions of the outline drawing. If the dimensions meet the design requirements, then step three can be carried out. Otherwise, the electric pump product is unqualified.

[0112] Test method for step 3 above:

[0113] First, remove the pump head from the electric pump. Then, attach some reflective paper to the motor shaft extension. Adjust the controller to ensure the motor operates under rated conditions. Use an infrared tachometer to measure the actual speed of the electric pump motor, aiming it at the reflective paper. Following the provisions of Article 3.3 of GJB150.1A, if the measured motor speed is within the tolerance of ±2% of the design speed requirement, proceed to Step 4. Otherwise, the electric pump product is unqualified.

[0114] Test method for step 4 above:

[0115] 4.1 Electric pump pipeline pressure maintenance test

[0116] like Figure 2As shown in the schematic diagram of the hydrogen peroxide electric pump flow test system, the electric pump is installed on the test bench and connected to the entire system pipeline. The front-end No. 1 water tank is pressurized by the compressed air cylinder to achieve air source pressure increase to 0.8MPa. The valve in front of the pump is opened and the valve after the pump is closed, so that the pressure is transmitted to the tail end of the electric pump. A pressure sensor is placed before and after the pump respectively. The No. 1 water tank is also placed on a pressure gauge for pressure measurement. During the entire pressure maintenance process, the pressure gauge and the data of the pressure sensor in front of the pump are consistent, basically maintaining a size of 0.8MPa. The pressure maintenance time is 10min, and the pressure drop does not exceed 0.01MPa, which meets the requirements of the electric pump system pipeline sealing pressure maintenance test. Otherwise, the electric pump product is unqualified and the performance test of the immersion hydrogen peroxide electric pump cannot be carried out.

[0117] 4.2 Performance test of electric pump

[0118] like Figure 2 As shown in the schematic diagram of the hydrogen peroxide electric pump flow test system, an electric pump installed on a test bench is connected to the fluid circuit test system. First, hydrogen peroxide is added to water tank No. 1. The valves before and after the pump are closed, and compressed air is used to pressurize water tank No. 1 until the target value is reached. The electric pump speed is regulated by a controller. Control of the valves before and after the pump, as well as data collection and display from the pressure sensors before and after the pump, are all handled by a PLC control unit. The controller regulates the speed of the electric pump until the target speed is reached. The control unit then controls the valve opening to achieve load flow control. The inlet flowmeter provides real-time flow rate feedback, while the pressure sensor after the pump also provides pressure data.

[0119] The test was conducted at 18,000 rpm, 30,000 rpm, and 36,000 rpm, respectively. The flow rate of the electric pump was adjusted from small to large to a total of 29.1 mL / s, 38.8 mL / s, 48.5 mL / s, 58.2 mL / s, 67.9 mL / s, 77.6 mL / s, 87.3 mL / s, 92.2 mL / s, 97 mL / s, 101.9 mL / s, 106.7 mL / s, 111.6 mL / s, and 116.4 mL / s, while recording the pressure change. When the electric pump was running at different speeds, the flow rate changed as shown above. The relationship between the electric pump head, shaft power, and flow rate was obtained, and the electric pump performance curve was plotted. If the electric pump performance data obtained was within the design range, the test passed; otherwise, the electric pump product failed.

Claims

1. A method for testing a high-speed electric pump with its interior immersed in hydrogen peroxide, characterized in that: The following steps are involved: ① Test the interphase resistance, insulation resistance, and insulation dielectric strength of the electric pump during assembly. If the test passes, proceed to step ②. Otherwise, the electric pump product fails. ② Check the appearance of the assembled electric pump and review the dimensions. If the requirements are met, proceed to step ③. Otherwise, the electric pump product is unqualified. ③ Carry out speed test on the electric pump. If the test result meets the design range requirements, proceed to step ④. Otherwise, the electric pump product fails to meet the requirements. ④Perform performance test on the electric pump; The step ① is divided into the following steps: (1.1) Test of interphase resistance: Use a microresistance meter to measure, clamp pin 1 and pin 2 on any two phases of the winding, and obtain the interphase resistance. If the test result meets the design range requirements, proceed to step (1.2), otherwise the electric pump product fails to meet the requirements; (1.2) Insulation resistance test: Use an ohmmeter to test the insulation performance of the motor. If the insulation resistance between the motor stator winding and the housing is greater than 1000MΩ, it meets the design requirements and proceeds to step (1.3). Otherwise, the electric pump product is unqualified. (1.3) Insulation dielectric strength test: Use a withstand voltage tester to check. Apply an AC voltage of 50 Hz and 1540 V RMS between the windings of the electric pump. Then test the insulation resistance according to step (1.2). If there is no arcing, sparking or breakdown during the entire test, the leakage current is no more than 5 mA, and the insulation resistance between the tested motor stator winding and the housing is greater than 1000 MΩ, then the design requirements are met and proceed to step 2. Otherwise, the electric pump product is unqualified. The step ② is divided into the following steps: (2.1) Check the appearance of the electric pump. If it meets the design requirements, proceed to step (2.2). Otherwise, the electric pump product is unqualified. (2.2) Review the external dimensions and use measuring tools that ensure the dimensional accuracy requirements to check the installation dimensions of the external dimensions. If the design requirements are met, proceed to step ③. Otherwise, the electric pump product is unqualified; The step ③ is divided into the following steps: (3.1) Remove the pump head of the electric pump and attach reflective paper to the motor shaft of the electric pump. Adjust the controller to make the motor operate under rated conditions. Use an infrared speed meter to measure the actual speed of the electric pump motor by pointing it at the reflective paper on the motor shaft. (3.2) If the tolerance between the measured motor speed and the speed required by the electric pump design is ±2%, then proceed to step ④; otherwise, the electric pump product is unqualified; The step ④ is divided into the following steps: (4.1) Install the electric pump on the test bench and perform a sealing and pressure test on the entire piping system. If the test passes, proceed to step (4.2). Otherwise, the electric pump product fails. (4.2) The electric pump installed on the test bench is connected to the liquid circuit test system, and the hydrogen peroxide medium is added to the entire system. The electric pump maintains a constant motor speed and controls the valve opening after the pump to achieve load flow control. The parameters are tested using pressure sensors and flow sensors before and after the pump. If the tested pressure and flow after the pump are within the design range, the performance test is passed. Otherwise, the electric pump product fails.

2. The method for testing a high-speed electric pump with internal immersion in hydrogen peroxide according to claim 1, wherein: In the step (1.1), when the ambient temperature is not 20°C during detection, the conversion is performed using the formula: R t =R 20 ×[1+0.0038×(t-20)] Among them, R t is the resistance when the ambient temperature is t, R 20 is the resistance when the ambient temperature is 20℃, and t is the ambient temperature.

3. The method for testing a high-speed electric pump with internal immersion in hydrogen peroxide according to claim 1, wherein: In the step (1.2), a 1000V megohmmeter is used to test the insulation resistance between the winding and the housing, and all output terminals of the electrical connector are combined for testing.

4. The method for testing a high-speed electric pump with internal immersion in hydrogen peroxide according to claim 1, wherein: In the step (1.3), the voltage is increased uniformly at a rate of not less than 500 V / s from 0 V to 1540 V, maintained at 1540 V for 1 minute, and then gradually decreased to 0 V.

5. The method for testing a high-speed electric pump with internal immersion in hydrogen peroxide according to claim 1, wherein: In the above step (2.1), the appearance must meet the following conditions: a. The surface of the electric pump shall be free of rust, burrs, oil stains, bumps, scratches and peeling of coating; b. The fasteners are firmly connected and have no defects; c. The nameplate logo is clear and correct; d. The pins inside the socket are not bent; e. The correspondence between the model, installation position and marking of the socket with the same key position should comply with the requirements of the appearance drawing.

6. The method for testing a high-speed electric pump with internal immersion in hydrogen peroxide according to claim 1, wherein: In the step (4.1), during the entire pressure maintaining process, the data of the pressure gauge and the pressure sensor in front of the pump remain consistent, maintaining the value at 0.8 MPa, the pressure maintaining time is 10 minutes, and the pressure drop does not exceed 0.01 MPa, which meets the requirements of the electric pump system pipeline sealing pressure maintaining test.

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