A pressure loss detection system for a filter

Abstract

The utility model provides a kind of pressure loss detection system for filter, including oil pool and oil pump, temperature sensor T3 is provided in oil pool, oil pump is bidirectional oil pump, the first inlet and outlet of oil pump extend to the oil liquid in oil pool by pipeline, the second inlet and outlet of oil pump after flow sensor Q1 and pressure sensor P3, again, extend to the oil liquid in the oil pool after first branch, second branch and third branch respectively;Wherein, test station, temperature sensor and pressure sensor are provided on first branch;By being arranged in same temperature control environment bin, reduce the influence of heat exchange to test data;Again, the cleanliness of oil liquid is controlled by first filter in second branch and second filter in third branch, reduce the influence of impurity in oil liquid to the pressure loss of filter to be measured;To improve the pressure loss detection precision of the system to filter to be measured.

Description

Technical Field

[0001] This utility model relates to a test system for filters, specifically a pressure loss detection system for filters. Background Technology

[0002] like Figure 1 As shown, the pressure loss detection system of the electric drive filter currently consists mainly of an oil tank 3, a unidirectional oil supply vane pump M, a pre-pump test station F12, and a post-pump test station F11. A pressure sensor P2 is installed between the vane pump M and the pre-pump test station F12, and a pressure sensor P1 is installed between the vane pump M and the post-pump test station F11. A flow sensor Q1 is installed in the return oil circuit, and a temperature sensor T3 is installed in the oil tank 3. The pre-pump test station F12 and the oil tank 3 are arranged inside the temperature-controlled environment chamber 1, while other technical features are arranged outside the temperature-controlled environment chamber 1, i.e., the external environment 2 with the same atmospheric pressure and temperature.

[0003] When testing a filter press, install it at test station F11 after the pump and leave test station F12 before the pump unused. Adjust the temperature environment chamber 1 and the oil temperature, then start the vane pump M. When both temperature sensor T3 and flow sensor Q1 reach their target values, read the reading of pressure sensor P1, which is the pressure loss value of the filter press under the target operating conditions. When testing a suction filter, install it at test station F12 before the pump and leave test station F11 after the pump unused. Adjust the temperature environment chamber 1 and the oil temperature, then start the vane pump M. When both temperature sensor T3 and flow sensor Q1 reach their target values, read the reading of pressure sensor P2, which is the pressure loss value of the suction filter under the target operating conditions.

[0004] The following defects exist in this process:

[0005] 1. The temperature sensor is only placed inside the oil sump, and the heat exchange of the oil during the flow process is not taken into account. The actual oil temperature reaching the filter is different from the temperature of the temperature sensor T3.

[0006] 2. Only one pressure sensor is installed before the filter. The default pressure after the filter is atmospheric pressure (0 pressure). In reality, there is also pressure in the pipe after the filter, which leads to inaccurate pressure loss measurement.

[0007] 3. The system does not consider the impact of oil cleanliness on the tested filter;

[0008] 4. The filter press is located outside the temperature environment chamber. Due to the influence of heat exchange, the temperature difference before and after it is too large, which leads to inaccurate pressure loss measurement.

[0009] 5. When testing suction filters and pressure filters, the filters need to be arranged at different workstations, which is complicated and inefficient. Utility Model Content

[0010] In view of the problems in the prior art, this utility model provides a pressure loss detection system for filters, aiming to improve the convenience of pressure loss detection.

[0011] A pressure loss detection system for a filter includes an oil tank and an oil pump. The oil tank stores oil and contains a temperature sensor T3. The oil pump is a bidirectional pump. The first inlet and outlet of the pump extend into the oil in the oil tank via pipelines. The second inlet and outlet of the pump, after passing through a flow sensor Q1 and a pressure sensor P3, extend into the oil in the oil tank via a first branch, a second branch, and a third branch, respectively. The first branch is connected in series with a first-loop switch and a test station. On one side of the test station, the first branch is connected in series with a temperature sensor T1 and a pressure sensor P1, while on the other side, the first branch is connected in series with a temperature sensor T2 and a pressure sensor P3. The second branch is connected in series with a second-loop switch and a first filter for testing oil cleanliness. The third branch is connected in series with a third-loop switch and a second filter for filtering the oil. The oil tank, oil pump, pipelines, and the first, second, and third branches are all located within the same temperature-controlled environment chamber.

[0012] Furthermore, the bidirectional oil pump is an electronic pump.

[0013] Furthermore, the first circuit switch, the second circuit switch, and the third circuit switch are all solenoid valves.

[0014] Furthermore, the data display units of flow sensor Q1, temperature sensor T1, temperature sensor T2, temperature sensor T3, pressure sensor P1, and pressure sensor P2 are all located outside the temperature-controlled environment chamber.

[0015] Further, the first circuit switch, the second circuit switch, the third circuit switch, and the data display unit are connected to the computer.

[0016] Furthermore, the first filter is a metal mesh with a precision range of 10μm - 70μm.

[0017] Furthermore, the second filter is a filter paper filter with an accuracy range of 3μm - 20μm.

[0018] The beneficial effects of this utility model are as follows: by setting the system in the same temperature-controlled environment chamber, the impact of heat exchange on test data is reduced; by controlling the cleanliness of the oil through the first and second filters, the impact of impurities in the oil on the pressure loss of the filter under test is reduced; thereby improving the accuracy of the pressure loss detection of the filter under test; and by controlling the forward and reverse rotation of the bidirectional oil pump, the filter press and suction filter can be installed and tested at the same test station, which is convenient for operation and improves work efficiency. Attached Figure Description

[0019] Figure 1 This is a block diagram of a traditional pressure loss detection system;

[0020] Figure 2 This is a system block diagram of the present invention. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0022] A pressure loss detection system for filters, such as Figure 2 As shown, the system includes an oil tank 3 and an oil pump E. The oil tank 3 stores oil and is equipped with a temperature sensor T3 for monitoring the oil temperature. The oil pump E is a bidirectional, electronic pump. The first inlet and outlet of the oil pump E extend through pipelines into the oil in the oil tank 3. The second inlet and outlet of the oil pump E, after passing through a flow sensor Q1 and a pressure sensor P3, extend into the oil in the oil tank 3 via a first branch, a second branch, and a third branch, respectively. The first branch is connected in series with a first-loop switch V1 and a test station F1. On one side of the test station F1, the first branch is connected in series with a temperature sensor T1 and a pressure sensor P1. On the other side of the test station F1, the first branch is connected in series with a temperature sensor T2 and a pressure sensor P3. The second branch is connected in series with a second-loop switch V2 and a first filter F2 for testing the cleanliness of the oil. The first filter F2 is a high-precision metal filter with a precision range of 10 μm. 70μm, sensitive to pressure loss; the third branch is connected in series with the third circuit switch V3 and the second filter F3 for filtering the oil. The second filter F3 is a filter paper filter with an accuracy range of 3μm - 20μm and has dust-holding properties; the oil tank 3, oil pump E, pipeline, first branch, second branch and third branch are all located in the same temperature-controlled environment chamber 1.

[0023] In this embodiment, the first circuit switch V1, the second circuit switch V2, and the third circuit switch V3 are all solenoid valves. To facilitate data reading, the data display units A of the flow sensor Q1, temperature sensor T1, temperature sensor T2, temperature sensor T3, pressure sensor P1, and pressure sensor P2 are all located outside the temperature-controlled environment chamber 1, i.e., the external environment 2 with the same atmospheric pressure and temperature. In other embodiments, the first circuit switch V1, the second circuit switch V2, the third circuit switch V3, and the data display unit A are connected to a computer (PC). The computer is used to control the switching states of the first circuit switch V1, the second circuit switch V2, and the third circuit switch V3 and record the data of the data display unit A to achieve automated control.

[0024] Before testing the filter under test, close the first loop switch V1 and the third loop switch V3, and open the second loop switch V2 and the oil pump E to allow the oil to flow through the first filter F2. Read the total system pressure through the pressure sensor P3 and run for a certain period of time. If the total pressure continues to rise and exceeds the set threshold, it indicates that the first filter F2 is clogged, further indicating that the oil is dirty. If used to test the filter under test, it will affect the pressure loss test results of the filter under test. In this case, it is necessary to open the third loop switch V3 and the oil pump, close the second loop switch V2 and the first loop switch V1, and allow the oil to enter the second filter F3 for fine filtration to capture impurities in the oil and improve the cleanliness of the oil. After running for a period of time, replace the first filter F2 with a new one, open the second loop switch V2, close the third loop switch V3 and the first loop switch F1, and use the new first filter F2 for testing and confirmation. If the first filter F2 is not clogged, it indicates that the oil cleanliness is qualified, and the pressure loss test of the filter under test can be performed.

[0025] When testing the filter press, install the filter press at the test station F1, turn on the first circuit switch V1 and the oil pump E, and the oil pump E will rotate forward. Turn off the second circuit switch V2 and the third circuit switch V3, so that the oil flows through the filter press after passing through the oil pump E, thereby detecting the pressure loss of the filter press. When the flow sensor Q1 is equal to the target value, and the temperatures of the temperature sensors T1, T2 and T3 are all within a reasonable range, the difference between the pressure sensor P2 and the pressure sensor P1 is the actual pressure loss of the filter press.

[0026] When testing the suction filter, install the suction filter at the test station F1, turn on the first circuit switch V1 and the oil pump E, the oil pump E reverses, and the second circuit switch V2 and the third circuit switch V3 are turned off, so that the oil flows through the suction filter and then through the oil pump E, thereby performing pressure loss detection on the suction filter; when the flow sensor Q1 is equal to the target value, and the temperatures of the temperature sensors T1, T2 and T3 are all within a reasonable range, the difference between the pressure sensor P2 and the pressure sensor P1 is the actual pressure loss of the suction filter.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure loss detection system for a filter, comprising an oil tank and an oil pump, wherein the oil tank stores oil, and a temperature sensor T3 is installed in the oil tank, characterized in that: The oil pump is a bidirectional oil pump. The first inlet and outlet of the oil pump extend into the oil in the oil tank via pipelines. The second inlet and outlet of the oil pump, after passing through flow sensor Q1 and pressure sensor P3, extend into the oil in the oil tank via the first branch, second branch, and third branch, respectively. The first branch is connected in series with a first circuit switch and a test station. On one side of the first branch, a temperature sensor T1 and a pressure sensor P1 are connected in series, and on the other side of the first branch, a temperature sensor T2 and a pressure sensor P3 are connected in series. The second branch is connected in series with a second circuit switch and a first filter for testing the cleanliness of the oil. The third branch is connected in series with a third circuit switch and a second filter for filtering the oil. The oil tank, oil pump, pipelines, first branch, second branch, and third branch are all located in the same temperature-controlled environment chamber.

2. The pressure loss detection system for a filter according to claim 1, characterized in that: The bidirectional oil pump is an electronic pump.

3. The pressure loss detection system for a filter according to claim 1, characterized in that: The first circuit switch, the second circuit switch, and the third circuit switch are all solenoid valves.

4. The pressure loss detection system for a filter according to claim 1, characterized in that: The data display units of flow sensor Q1, temperature sensor T1, temperature sensor T2, temperature sensor T3, pressure sensor P1, and pressure sensor P2 are all located outside the temperature-controlled environment chamber.

5. The pressure loss detection system for a filter according to claim 4, characterized in that: The first circuit switch, second circuit switch, third circuit switch, and data display unit are connected to the computer.

6. The pressure loss detection system for a filter according to claim 1, characterized in that: The first filter is a metal mesh with a precision range of 10μm - 70μm.

7. The pressure loss detection system for a filter according to claim 1, characterized in that: The second filter is a filter paper filter with an accuracy range of 3μm - 20μm.

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