An oil filter sealed electrostatic protection performance test system and method

Abstract

The application discloses a sealed oil filter element electrostatic protection performance test system and method, and solves the problem that existing electrostatic performance test systems are often complex in structure, inconvenient to operate, and cannot meet the test requirements of filters in the nuclear industry and other fields.

Description

Technical Field

[0001] This invention relates to the field of performance testing technology for sealing oil filter elements, and in particular to a system and method for testing the electrostatic protection performance of filter elements. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] In high-risk fields such as the nuclear industry, testing the electrostatic discharge (ESD) protection performance of sealing oil filter elements is an important task. Most sealing oil systems operate in high-flow, high-temperature environments, making them prone to static electricity buildup, which can lead to the following problems:

[0004] 1. Reduced filter efficiency: Static electricity accumulates on the surface of the filter media, attracting tiny impurity particles, which can easily cause local blockage and stress concentration, ultimately damaging the filter media and reducing filtration efficiency.

[0005] 2. Damage to the filter: When static electricity accumulates to a certain level, it can easily cause tip-to-point static electricity, increase the temperature of the filtration system, accelerate the wear and tear of the filter media, and speed up the wear and tear of the filter.

[0006] However, existing electrostatic performance testing systems are often complex in structure, inconvenient to operate, and cannot meet the testing requirements of filters in fields such as nuclear industry. Therefore, there is a need for a simpler and more accurate electrostatic protection performance testing system and method for sealed oil filter elements to solve the above problems. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a filter element electrostatic protection performance testing system.

[0008] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0009] A system for testing the electrostatic protection performance of a sealed oil filter element includes a filtration system and an electrostatic testing system.

[0010] The filtration system includes a power pump and a first filter housing to be tested. The power pump and the first filter housing to be tested are connected by an insulated pipe. The filtration system forms a loop for the circulation of medium oil. The first filter housing to be tested is used to install the filter element to be tested, forming the first filter to be tested.

[0011] The electrostatic testing system includes a first filter under test, a voltmeter, an ammeter, and a grounding system. The voltmeter is connected to both ends of the housing of the first filter under test and is used to detect the electrostatic voltage value generated by the filter under test when the grounding system is disconnected. An ammeter is also connected to the housing of the first filter under test and is connected to the grounding system. When the grounding system is turned on, the electrostatic charge of the first filter under test forms an instantaneous current through the grounding system, and the ammeter is used to detect the current value.

[0012] The electrostatic resistance value is obtained by calculating the ratio of voltage to current, thus determining the electrostatic protection performance of the filter element under test.

[0013] This invention uses a voltmeter and an ammeter to test the filter under test. The filter element under test is installed in the housing of the first filter under test to form the first filter under test. The medium oil flows through the filter under test multiple times in the circulation path of the filtration system. The filter element under test generates static electricity through friction with the filtered oil. The static voltage generated by the first filter under test is measured by the voltmeter and ammeter. The grounding system is turned on to obtain the current of the grounding system. The static resistance value is obtained based on the ratio of the voltage value and the current value. The static resistance of the filter element under test can be obtained through the static resistance. The electrostatic protection performance of the filter element can be obtained through the static resistance. The system has a simple structure, is easy to operate, and has good market application prospects.

[0014] In some embodiments, the electrostatic testing system further includes a capacitance meter connected to both ends of the housing of the first filter under test, for detecting the electrostatic capacitance generated by the first filter under test.

[0015] In some embodiments, the electrostatic protection performance testing system for sealing oil filter elements further includes a control collection system, which includes a power pump and a second filter housing to be tested. The power pump and the second filter housing to be tested in the control collection system are connected by an insulated pipe to form a channel for the circulation of the medium oil.

[0016] In this invention, the first test filter housing of the filtration system is fitted with the filter element to be tested, while the second test filter housing of the control collection system is not fitted with a filter element. The media oil circulates independently in the circulation paths of the filtration system and the control collection system. Static electricity is generated by friction between the pipes and other structures in the circulation paths and the filtered oil. Static electricity is also generated by friction between the test filter element and the filtered oil. After multiple cycles, the static electricity gradually accumulates and diffuses into the media oil. The oil in the two paths is collected separately, and the resistance of the two oils is measured. The difference between the two resistances yields the actual resistance value R of the oil generated by static electricity in the filter element, thus achieving an evaluation of the electrostatic protection performance of the filter element sample. The actual resistance value excludes the resistance value generated by static electricity from friction between the oil, pipes, and the test filter housing, resulting in a more accurate evaluation of the electrostatic protection performance of the filter element sample.

[0017] In some embodiments, the control collection system further includes a blank sampling container connected after the second test filter; used to collect the medium oil after circulation of the control collection system.

[0018] The filtration system also includes a filtrate sampling container, which is connected after the filter to be tested in the filtration system and is used to collect the medium oil after the filtration system has circulated.

[0019] In some embodiments, a grounding switch is also connected between the ammeter and the housing of the filter under test. During the sealing oil circulation process, the grounding switch is disconnected to prevent the loss of electrostatic charge from the filter under test. The grounding switch is closed to open the grounding system, allowing the charge of the filter under test to be released through the ammeter.

[0020] In some embodiments, the electrostatic testing system further includes a DC power supply and a protective resistor. When the amount of static electricity generated by the filter element under normal filtration conditions is difficult to read, an external static electricity is provided by the DC power supply to obtain the resistance and capacitance values ​​of different filter elements under test, and to accurately compare the electrostatic protection performance of different filter elements under test.

[0021] In some embodiments, the housing of the first filter under test is equipped with a rotating component, which rotates the filter element. When the amount of static electricity generated by the filter element under normal filtration is difficult to read, the filter under test can be rotated while the filter element is filtering oil to enhance the static electricity and accurately compare the electrostatic protection performance of different filter elements under test.

[0022] In some embodiments, the filtration system further includes a flow meter to detect the flow rate of the oil pump control circuit, ensuring that the flow rate is not less than 100 L / min.

[0023] In some embodiments, a pressure gauge is also connected to both ends of the housing of the first filter under test in the filtration system to detect the pressure difference between the input and output ends of the filter under test, thereby monitoring the filtration status of the filter element.

[0024] Another objective of the invention is to provide a method for testing the electrostatic protection performance of a sealed oil filter element.

[0025] Another embodiment of the present invention provides the following technical solution:

[0026] A method for testing the electrostatic protection performance of a sealed oil filter element includes:

[0027] (1) Install the filter element to be tested into the housing of the first filter to be tested to form the first filter to be tested. Turn on the power pump in the filter system circuit, turn on the capacitance meter, let the medium oil flow through the filter element at the specified flow rate, circulate it multiple times, and observe and record the data of the capacitance meter and voltage meter.

[0028] (2) Turn on the grounding system and record the instantaneous current of the ammeter. Turn off the grounding system and clear the capacitance meter to zero.

[0029] (3) Rotate the first filter under test according to the set method by rotating the rotating part, and record the data of the capacitance meter and voltmeter;

[0030] (4) Turn on the grounding system, record the instantaneous current of the ammeter, and turn off the capacitance meter;

[0031] (5) Turn on the DC power supply to power the first filter under test and record the data of the voltmeter; after a period of time, turn off the DC power supply, close the grounding switch, open the grounding system, and record the instantaneous current of the ammeter.

[0032] By testing different filter elements according to the above steps, and comparing their electrostatic protection performance under non-rotating, rotating, and external current conditions, the accuracy of filter element performance comparison is improved.

[0033] Another objective of this invention is to provide a method for testing the electrostatic protection performance of a sealed oil filter element.

[0034] Another embodiment of the present invention provides the following technical solution:

[0035] A method for testing the electrostatic protection performance of a sealed oil filter element includes:

[0036] (1) Install the filter element sample to be tested in the filter to be tested, without installing the filter element in the filter to be tested. At the same time, turn on the power pump of the filtration system and the power pump of the control collection system, so that the test medium oil flows through the filter to be tested with the filter element and the filter housing at the specified flow rate.

[0037] (2) After the test medium oil has circulated a certain number of times, open the shut-off valve and collect the test oil into the filtrate sampling container and the blank sampling container.

[0038] (3) Test the resistance of the test oil in the filtrate sampling container and the blank sampling container respectively. Subtract the resistance of the test oil in the blank sampling container from the resistance of the test oil in the filtrate sampling container to obtain the actual resistance value of the filter element due to static electricity.

[0039] The system of this invention uses a combination of a filtration system circulation system and a control collection system to obtain the actual resistance value of the filter element due to static electricity, thereby achieving a quantitative assessment of the electrostatic protection performance of the filter element.

[0040] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0041] 1. The system of the present invention uses the same set of filtration system in a loop, which can not only compare the electrostatic protection performance of different filter elements, but also be used in combination with the control collection system to achieve quantitative evaluation of the electrostatic protection performance of the filter elements. By adding the control collection system, the electrostatic protection performance can be tested and evaluated in different ways, thereby improving the reliability of the test results.

[0042] 2. Depending on the situation, you can select the electrostatic protection performance of the filter element when it is working in a non-rotating state, a rotating state, and under external current conditions. You can also use them in combination to compare the electrostatic protection performance of different filter elements, which is more convenient and accurate.

[0043] 3. By adding a control acquisition system, the electrostatic protection performance can be tested and evaluated in different ways. That is, the filter element can be compared and tested, and the actual static resistance of the filter element can be tested, thus improving the reliability of the test results.

[0044] 4. This invention provides a test system for the electrostatic protection performance of a sealed oil filter, which can quickly and conveniently test the electrostatic protection status of a nuclear sealed oil filter element. It has low manufacturing cost and high application value. Attached Figure Description

[0045] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0046] Figure 1 This is an overall schematic diagram provided by an embodiment of the present invention;

[0047] In the picture:

[0048] 1-1, 1-2, Medium storage tank; 2, Shut-off valve; 3, Power pump; 4-1, 4-2, 4-3, 4-4, Flow meter; 5, First filter to be tested; 6, Filtrate sampling container; 7, Blank sampling container; 8, Second filter to be tested housing; 9, Pressure gauge; 10, DC power supply; 11, Protective resistor; 12, Voltmeter; 13, Capacitance meter; 14, Ammeter; 15, Grounding system; 16, Power switch; 17, Capacitance meter switch; 18, Grounding switch; 19, Blank sampling shut-off valve; 20, Sample sampling shut-off valve.

[0049] The distances or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0050] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0051] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the terms in this invention according to the specific circumstances.

[0052] As described in the background section, existing electrostatic performance testing systems are often complex in structure, inflexible in operation, and cannot meet the testing requirements of filters in fields such as the nuclear industry. To address these technical problems, this invention provides a testing system for the electrostatic protection performance of sealed oil filter elements.

[0053] Example 1

[0054] like Figure 1 As shown, one embodiment of the present invention describes a test system for the electrostatic protection performance of a sealed oil filter element.

[0055] The system includes a media storage tank, a filtration system, an electrostatic testing system, a control collection system, and a controller. The media storage tank comprises two unconnected parts: media storage tank 1-1 and media storage tank 1-2. The media storage tanks store media oil with a conductivity not exceeding 200 μS / m. Media storage tank 1-1 forms a sealed oil circuit with the filtration system, in which the media oil circulates through the filter element. Media storage tank 1-2 also forms a sealed oil circuit with the control collection system, in which the media oil circulates.

[0056] The filtration system includes a power pump 3, a flow meter 4-1, a first filter under test 5, and a shut-off valve 2. The medium storage tank 1-1, shut-off valve 2, power pump 3, flow meter 4-1, and the first filter under test 5 are sequentially connected via insulated pipes to form a sealed oil circuit. The filtration system also includes a flow meter 4-2, with its two ends connected to the output end of the first filter under test and the input end of the medium storage tank, respectively. The filter element under test is installed in the housing of the first filter under test 5. The power pump 3 in the filtration system circuit is turned on, allowing the medium oil to pass through the filter element at a specified flow rate. The power pump 3 controls the oil circuit flow rate to be no less than 100 L / min, circulating the medium oil a certain number of times.

[0057] A branch line is also connected between the flow meter 4-2 and the medium storage tank 1-1. The branch line is connected to the filtrate sampling container 6 and a sample sampling shut-off valve 20 is also connected to the branch line. The sample sampling shut-off valve 20 is set at the front end of the filtrate sampling container 6 and is used to control whether the circulating oil flows into the filtrate sampling container 6.

[0058] A pressure gauge 9 is also connected to both ends of the first filter under test 5 in the filtration system to detect the pressure difference between the input and output ends of the filter under test.

[0059] In the filtration system, a voltmeter 12 is connected to both ends of the first filter under test 5 to detect the electrostatic voltage generated by the first filter under test 5. A capacitance meter 13 is also connected to both ends of the first filter under test 5 through a capacitance meter switch 17. Closing the capacitance meter switch 17 detects the capacitance of the electrostatic charge generated by the first filter under test 5. An ammeter 14 is connected to the first filter under test 5, and the ammeter 14 is connected to the grounding system 15 through a grounding switch 18. When the grounding system 15 is turned on, the instantaneous current passing through the ammeter is recorded. The grounding system 15 consists of multiple metal grounding electrodes buried at a certain depth underground and a grounding body with conductors connecting these grounding electrodes to form a mesh structure. During the sealing oil circulation process, the grounding switch 18 is opened to prevent the loss of electrostatic charge from the first filter under test, and the grounding switch 18 is closed to release the charge of the first filter under test through the ammeter 14.

[0060] The first filter under test 5 is equipped with a rotating component on its outer shell. The filter element is rotated by the rotating component. When the amount of static electricity generated by the filter element under normal filtration is difficult to read, the first filter under test 5 can be rotated while the filter element is filtering oil to enhance the static electricity.

[0061] The control collection system includes a shut-off valve 2, a power pump 3, a flow meter, and a second test filter housing 8. The medium storage tank 1-2, shut-off valve 2, power pump 3, flow meter 4-3, second test filter housing 8, and flow meter 4-4 are sequentially connected by an insulated pipe to form a sealed oil circuit. The second test filter housing 8 is not equipped with a filter element. The power pump 3 in the control collection system circuit is turned on, allowing the medium oil to pass through the test filter 8 at a specified flow rate. The power pump 3 controls the oil circuit flow rate to be no less than 100 L / min, circulating the medium oil a certain number of times.

[0062] The output terminal of the flow meter 4-4 is also connected to a branch line, on which a blank sampling stop valve 19 and a blank sampling container 7 are connected. The blank sampling stop valve 19 is located at the front end of the blank sampling container 7 and is used to control whether the circulating oil flows into the blank sampling container 7.

[0063] A pressure gauge 9 is also connected to both ends of the second test filter housing 8 in the comparison collection system to detect the pressure difference between the input and output ends of the second test filter housing 8.

[0064] The electrostatic testing system includes a filter under test, a voltmeter 12, an ammeter 14, a grounding system 15, a filtrate sampling container 6, and a blank sampling container 7. The grounding system is switched off to allow the medium oil to circulate. A voltmeter 12 and a capacitance meter 13 are connected in parallel across the first filter under test 5 to measure the voltage and capacitance values ​​across it, respectively. An ammeter 14 is also connected to the first filter under test 5 and is connected to the grounding system 15. The grounding system is switched on and the instantaneous current passing through the ammeter is recorded. When the medium oil generates static electricity through friction with the filter element, insulating tube, and other structures, the electrostatic testing system measures the voltage, current, capacitance, or resistance data of the static electricity generated during the filtration process.

[0065] The electrostatic testing system also includes a DC power supply 10 and a protective resistor 11. The protective resistor 11, the DC power supply 10 and the power switch 16 are connected in series at both ends of the first filter housing 5 under test. The power switch 16 is generally in the off state. When the amount of static electricity generated by the filter element under normal filtration is difficult to read, closing the power switch 16 can provide external static electricity to the system from the DC power supply 10.

[0066] The specific testing principle is as follows:

[0067] The first filter element to be tested is installed in the housing of the first filter to be tested 5. The shut-off valve 2 between the medium storage tank 1-1 and the power pump 3 is opened. The sealing oil in the medium storage tank 1-1 circulates through the first filter to be tested along the pipeline 2 using the power provided by the power pump 3. The sealing oil generates static electricity in the pipeline. The voltage and capacitance values ​​of the first filter to be tested are obtained by the voltmeter 12 and the capacitance meter 13. The grounding system 15 is turned on. The current flows through the ammeter 14 instantaneously and the current value is obtained. The controller obtains the static resistance value by calculating the ratio of the voltage value and the current value.

[0068] To test another filter element, replace it with the second filter element and repeat the above steps to obtain the static resistance and capacitance values ​​of the second filter element.

[0069] The controller compares the static resistance values ​​of the first and second filter elements under test, and compares the electrostatic protection performance of the two filter elements when they are working in a non-rotating state. If the static resistance of the two filter elements is close, such as if the difference between the static resistance of the two filter elements is not large, such as less than 1Ω, the controller then compares the size of the static capacitance of the two filter elements. The smaller the capacitance value and the higher the resistance value, the better the electrostatic protection performance of the filter element itself.

[0070] Example 2

[0071] Based on the above embodiments, this embodiment provides a method for testing the electrostatic protection performance of a sealing oil filter element, the specific steps of which are as follows:

[0072] 1. Install the filter element to be tested in the first filter to be tested 5, turn on the power pump 3 in the filtration system circuit, turn on the capacitance meter 13, let the medium oil flow through the filter element at the specified flow rate, circulate it multiple times, and observe and record the data of capacitance meter 13 and voltage meter 12.

[0073] The flow rate of the power pump control oil circuit is 200L / min, and the medium oil circulates 100 times.

[0074] 2. Turn on the grounding system 15 and record the instantaneous current of the ammeter 14. Turn off the grounding system 15 and clear the capacitance meter 13.

[0075] The static resistance of the filter element is calculated by combining the voltage value recorded in step 1 and the current value recorded in step 2. The static resistance is used to evaluate the electrostatic protection performance of the filter element in a non-rotating state.

[0076] 3. Rotate the first filter under test 5 according to the set method, and record the data of capacitance meter 13 and voltmeter 12;

[0077] 4. Turn on the grounding system 15, record the instantaneous current of the ammeter 14, and turn off the capacitance meter 13;

[0078] The static resistance of the filter element is calculated by combining the voltage value recorded in step 3 and the current value recorded in step 4. Both static resistance and capacitance values ​​can be used to evaluate the electrostatic protection performance of the filter element in a rotating state.

[0079] 5. Turn on the DC power supply 10 to power the first filter under test 5, record the data of the voltmeter 12, disconnect the DC power supply after a period of time, turn on the grounding system 15, and record the instantaneous current of the ammeter 14.

[0080] By calculating the electrostatic resistance of the filter element using the voltage and current values ​​recorded in step 5, the electrostatic protection performance of the filter element when it is working under external current conditions is evaluated.

[0081] To compare the two filter elements to be tested, replace the filter element in the housing of the first filter element to be tested and repeat steps 1-5 above.

[0082] The resistance values ​​of the two filter elements under test are compared when they are operating in a non-rotating state, a rotating state, and under external current conditions. A higher resistance value indicates better electrostatic protection performance. If the static resistances of the two filter elements are similar (e.g., less than 1Ω), the static capacitance is compared. A lower capacitance value indicates better electrostatic protection performance. This allows for a comparison of the electrostatic protection performance of different filter elements under these conditions.

[0083] Example 3

[0084] Based on the above embodiments, this embodiment provides another method for testing the electrostatic protection performance of a sealing oil filter element, the specific steps of which are as follows:

[0085] 1. Install the filter element sample to be tested in the first filter element 5, and do not install the filter element in the housing 8 of the second filter element. At the same time, turn on the power pump 3 of the filtration system and the power pump 3 of the control collection system, so that the test medium oil flows through the first filter element 5 and the housing 8 of the second filter element at a specified flow rate.

[0086] 2. After the test medium oil has circulated a certain number of times, open the blank sampling stop valve 19 and the sample sampling stop valve 20 to collect the test oil into the filtrate sampling container 6 and the blank sampling container 7.

[0087] The flow rate of the power pump control oil circuit is 300L / min, and the medium oil is circulated 200 times.

[0088] 3. Test the resistance of the test oil in the filtrate sampling container 6 and the blank sampling container 7 respectively. Record the resistance of the test oil in the filtrate sampling container 6 as R1; record the resistance of the test oil in the blank sampling container 7 as R2.

[0089] The actual resistance value R of the oil generated by static electricity in the filter element is obtained by subtracting the resistance of the test oil in the blank sampling container 7 from the resistance of the test oil in the filtrate sampling container 6, i.e., R = R1 - R2, thereby realizing the evaluation of the electrostatic protection performance of the filter element sample.

[0090] The resistance value obtained in this embodiment excludes the resistance value generated by static electricity from friction between the oil and pipelines and the filter housing under test, thus obtaining a more accurate evaluation of the electrostatic protection performance of the filter element sample.

[0091] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A system for testing the electrostatic protection performance of a sealed oil filter element, comprising a filtration system and an electrostatic testing system. The filtration system includes a power pump and a first filter housing to be tested. The power pump and the first filter housing to be tested are connected by an insulated pipe. The filtration system forms a loop for the circulation of medium oil. The first filter housing to be tested is used to install the filter element to be tested, forming the first filter to be tested. The electrostatic testing system includes a first filter under test, a voltmeter, an ammeter, and a grounding system; the voltmeter is connected to both ends of the housing of the first filter under test and is used to detect the electrostatic voltage value generated by the filter under test when the grounding system is disconnected. An ammeter is also connected to the housing of the first filter under test. The ammeter is connected to the grounding system. When the grounding system is turned on, the electrostatic charge of the first filter under test forms an instantaneous current through the grounding system. The ammeter is used to detect the current value. The electrostatic resistance value is obtained based on the ratio of voltage and current values, and the electrostatic protection performance of the filter element under test is obtained. The electrostatic protection performance testing system for sealed oil filter elements also includes a control collection system, which includes a power pump and a second filter housing to be tested. The power pump and the second filter housing to be tested in the control collection system are connected by an insulated pipe to form a channel for the circulation of the medium oil. The control collection system also includes a blank sampling container, which is connected after the second test filter; Alternatively, the filtration system may further include a filtrate sampling container connected after the filter to be tested in the filtration system; A pressure gauge is also connected to both ends of the filter under test in the filtration system; Alternatively, a pressure gauge can be connected to both ends of the filter under test in the comparison collection system to detect the pressure difference between the input and output ends of the filter under test.

2. The electrostatic protection performance testing system for sealed oil filter elements as described in claim 1, characterized in that, The electrostatic testing system also includes a capacitance meter, which is connected to both ends of the housing of the first filter under test and is used to detect the electrostatic capacitance generated by the first filter under test.

3. The electrostatic protection performance testing system for sealed oil filter elements as described in claim 1, characterized in that, A grounding switch is also connected between the ammeter and the housing of the filter under test. During the sealing oil circulation process, the grounding switch is disconnected to prevent the loss of electrostatic charge from the filter under test. When the grounding switch is closed, the grounding system is turned on, allowing the charge of the filter under test to be released through the ammeter.

4. The electrostatic protection performance testing system for sealed oil filter elements as described in claim 1, characterized in that, The electrostatic testing system also includes a DC power supply and a protective resistor, which is a variable resistor.

5. The electrostatic protection performance testing system for sealed oil filter elements as described in claim 1, characterized in that, The filter housing under test is equipped with a rotating component, which rotates the filter element.

6. A method for testing the electrostatic protection performance of a sealed oil filter element, comprising using a test system for testing the electrostatic protection performance of a sealed oil filter element as described in any one of claims 1-5, characterized in that, include: (1) Install the filter element to be tested in the housing of the first filter to be tested to form the first filter to be tested. Turn on the power pump in the filter system circuit and turn on the capacitance meter. Let the medium oil flow through the filter element at the specified flow rate and circulate it multiple times. Observe and record the data of the capacitance meter and the voltage meter. (2) Turn on the grounding system and record the instantaneous current of the ammeter. Turn off the grounding system and clear the capacitance meter. (3) Rotate the first filter under test according to the set method by rotating the rotating part, and record the data of the capacitance meter and voltmeter; (4) Turn on the grounding system, record the instantaneous current of the ammeter, and turn off the capacitance meter; (5) Turn on the DC power supply to power the first filter under test and record the voltmeter data; After a period of time, disconnect the DC power supply, open the grounding system, and record the instantaneous current of the ammeter.

7. A method for testing the electrostatic protection performance of a sealed oil filter element, comprising using a test system for testing the electrostatic protection performance of a sealed oil filter element as described in any one of claims 1-5, characterized in that, include: (1) Install the filter element sample to be tested in the filter to be tested, without installing the filter element in the filter to be tested. At the same time, turn on the power pump of the filtration system and the power pump of the control collection system, so that the test medium oil flows through the filter to be tested with the filter element and the filter housing at the specified flow rate. (2) After the test medium oil has circulated a certain number of times, open the shut-off valve and collect the test oil into the filtrate sampling container and the blank sampling container; (3) Test the resistance of the test oil in the filtrate sampling container and the blank sampling container respectively. Subtract the resistance of the test oil in the blank sampling container from the resistance of the test oil in the filtrate sampling container to obtain the actual resistance value of the filter element due to static electricity.

Images