Circulating filtration type oil filter with variable flow direction and control method thereof

Abstract

The invention discloses a circulating filtration type oil filter with a variable flow direction and a control method thereof, and the oil filter comprises a four-way ball valve which is provided with a first interface, a second interface, a third interface and a fourth interface; the first interface is communicated with the oil tank side; the third interface is communicated with the equipment side; the second connector is communicated with an oil inlet of the gear pump, an oil outlet of the gear pump is communicated with an oil inlet of the filtering assembly, and an oil outlet of the filtering assembly is communicated with the fourth connector. The reverse rotation of the oil conveying direction between the oil tank side and the equipment side can be realized through the four-way ball valve on the premise of not changing the rotation direction of the gear pump and not changing the internal liquid flow direction of the filter, so that the oil can be purified by the filtering assembly no matter whether the oil is injected into the equipment or pumped from the equipment, and the service life of the oil pump is prolonged. Dirty oil is prevented from directly entering an oil tank or equipment.

Description

Technical Field

[0001] This application relates to the field of oil filter technology, and in particular to a variable flow direction circulating filtration oil filter and its control method. Background Technology

[0002] In hydraulic lubrication systems, the cleanliness of the lubricating oil directly affects the operational stability and service life of the equipment. Oil filters, as a commonly used maintenance device, are widely used in scenarios such as adding new oil to equipment, removing old oil from equipment, or circulating and purifying the oil in the tank.

[0003] Currently, traditional oil filters have significant drawbacks in the field of hydraulic lubrication system oil purification: First, they are difficult to implement convenient bidirectional filtration. The equipment is typically unidirectional, requiring disassembly and replacement of pipelines when switching between oil extraction and injection directions, which is cumbersome and prone to leakage and contamination. If the motor is reversed, the unidirectional design of the filter can cause filtration failure. Second, the equipment is bulky and lacks portability. To achieve flow direction switching, complex valve groups and redundant pipelines are often used, resulting in excessive size and weight, making it difficult to adapt to confined spaces or frequently moving work environments. Third, the purification process is simplistic, with limited cleaning efficiency. Conventional single-pass filtration is insufficient for heavily contaminated oils or high cleanliness requirements, and the lack of standardized closed-loop filtration processes makes it difficult to achieve stable and effective improvement in oil cleanliness.

[0004] Therefore, there is an urgent need for a variable frequency speed control oil filter and its control method applicable to multiple scenarios, to solve the problems of complex and bulky pipeline structure, cumbersome bidirectional conveying switching, and inability to maintain effective filtration during reverse conveying of existing oil filter equipment.

[0005] Application content This application provides a variable flow direction circulating filter oil purifier and its control method to solve the above problems.

[0006] On one hand, this application provides a variable flow direction circulating filter oil filter, including: a four-way ball valve (3), the four-way ball valve (3) is provided with a first interface (301), a second interface (302), a third interface (303) and a fourth interface (304); the first interface (301) is used to communicate with the oil tank side (1); the third interface (303) is used to communicate with the equipment side (9); the second interface (302) is connected to the oil inlet of the gear pump (4), the oil outlet of the gear pump (4) is connected to the oil inlet of the filter assembly (6), and the oil outlet of the filter assembly (6) is connected to the fourth interface (304); the four-way ball valve (3) is configured to change the conveying direction of the oil between the oil tank side (1) and the equipment side (9) by switching its internal communication state, while maintaining the flow direction of the oil from the second interface (302) through the gear pump (4) and the filter assembly (6) to the fourth interface (304) unchanged.

[0007] In one implementation of this application, a flow meter (5) for monitoring flow rate is provided between the gear pump (4) and the filter assembly (6).

[0008] In one implementation of this application, a buffer tank (7) for buffer pressure pulsation is provided between the oil outlet of the filter assembly (6) and the fourth interface (304).

[0009] In one implementation of this application, a first shut-off valve (2) is provided between the oil tank side (1) and the first interface (301), and a second shut-off valve (8) is provided between the equipment side (9) and the third interface (303).

[0010] In one implementation of this application, the four-way ball valve (3) has a first working state and a second working state; in the first working state, the first interface (301) is connected to the second interface (302), and the third interface (303) is connected to the fourth interface (304); in the second working state, the first interface (301) is connected to the fourth interface (304), and the third interface (303) is connected to the second interface (302).

[0011] On the other hand, this application also provides a control method for a variable flow direction circulating filter oil filter. When the oil on the equipment side (9) needs to be filtered and transported to the oil tank side (1) using the aforementioned variable flow direction circulating filter oil filter, the following steps are performed: Close the first shut-off valve (2), the second shut-off valve (8), and the gear pump (4); Adjust the four-way ball valve (3) to the second working state so that the first port (301) is connected to the fourth port (304) and the third port (303) is connected to the second port (302); Open the first shut-off valve (2) and the second shut-off valve (8) and start the gear pump (4) so ​​that the oil flows from the equipment side (9) into the four-way ball valve (3) through the third interface (303), then flows out through the second interface (302) and flows through the gear pump (4) and the filter assembly (6) in sequence, and finally returns to the four-way ball valve (3) through the fourth interface (304) and flows out from the first interface (301) to the oil tank side (1).

[0012] In one implementation of this application, the method further includes: when it is necessary to filter the oil on the tank side (1) and then transport it to the equipment side (9), performing the following steps: Close the first shut-off valve (2), the second shut-off valve (8), and the gear pump (4); Adjust the four-way ball valve (3) to the first working state so that the first port (301) is connected to the second port (302) and the third port (303) is connected to the fourth port (304); Open the first shut-off valve (2) and the second shut-off valve (8) and start the gear pump (4) so ​​that the oil flows from the oil tank side (1) into the four-way ball valve (3) through the first interface (301), then flows out through the second interface (302) and flows through the gear pump (4) and the filter assembly (6) in sequence, and finally returns to the four-way ball valve (3) through the fourth interface (304) and flows out to the equipment side (9) from the third interface (303).

[0013] In one implementation of this application, the method further includes: monitoring the oil flow rate through a flow meter (5) and adjusting the speed of the motor driving the gear pump (4) by frequency conversion based on the monitoring results.

[0014] In one implementation of this application, before switching the working state of the four-way ball valve (3), it is determined that the first shut-off valve (2) and the second shut-off valve (8) are in the closed state.

[0015] The variable flow direction circulating filter oil purifier and its control method provided in this application have the following beneficial effects: 1. This application uses a four-way ball valve to reverse the oil delivery direction between the oil tank side and the equipment side without changing the rotation direction of the gear pump or the internal liquid flow direction of the filter. Therefore, it ensures that whether oil is being added to or drawn from the equipment, the oil can be purified by the filter components, preventing dirty oil from directly entering the oil tank or equipment.

[0016] 2. This application allows for the extraction and filtration of old oil from the equipment side to the oil tank via operating mode two first, followed by operating mode one. The oil in the oil tank is then filtered again and reinjected into the equipment. This allows for the same batch of oil to be filtered twice, thereby improving the cleanliness level of the oil.

[0017] 3. This application achieves bidirectional conveying function by using a single four-way ball valve, avoiding the use of complex valve groups and corresponding redundant connecting pipes and joints. Therefore, it can reduce the amount of metal components used, reduce the physical weight and volume of the whole machine, and meet the needs of frequent handling and mobile operations in multiple scenarios. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of the oil path in a variable-direction circulating filter oil purifier (mode 1) provided in this application embodiment; Figure 2 A schematic diagram of the oil path in Mode 2 of a variable-direction circulating filter oil purifier provided in this application embodiment; Figure 3 This is a schematic diagram of the interface distribution of a four-way ball valve provided in an embodiment of this application; Attached reference numerals: 1. Oil tank side; 2. Shut-off valve one; 3. Four-way ball valve; 301. Interface one; 302. Interface two; 303. Interface three; 304. Interface four; 4. Gear pump; 5. Flow meter; 6. Filter assembly; 7. Buffer tank; 8. Shut-off valve two; 9. Equipment side. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application provides a variable flow direction circulating filter oil purifier and its control method. A four-way ball valve allows for reversal of the oil delivery direction between the tank side and the equipment side without changing the rotation direction of the gear pump or the internal liquid flow direction of the filter. This ensures that whether oil is being added to or drawn from the equipment, the oil is purified by the filter assembly, preventing dirty oil from directly entering the tank or equipment. The technical solution proposed in this application will be described in detail below with reference to the accompanying drawings.

[0021] Example 1 This application provides a variable frequency speed control oil filter applicable to multiple scenarios, including: a four-way ball valve 3, which has an interface 301, an interface 302, an interface 303, and an interface 304; the interface 301 is connected to the oil tank side 1; the interface 303 is connected to the equipment side 9; the interface 202 is connected to the oil inlet of the gear pump 4; the oil outlet of the gear pump 4 is connected to the oil inlet of the filter assembly 6; and the oil outlet of the filter assembly 6 is connected to the interface 304; by adjusting the connection state between the interfaces of the four-way ball valve 3, the conveying direction of the oil between the oil tank side 1 and the equipment side 9 is switched, while keeping the flow direction of the oil from the gear pump 4 to the filter assembly 6 unchanged.

[0022] In this embodiment, by switching the position of the valve core inside the four-way ball valve 3, two independent flow circuits can be realized: when the four-way ball valve 3 is in mode one, when interface one 301 is connected to interface two 302 and interface four 304 is connected to interface three 303, an oil supply filtration passage from the oil tank side 1 to the equipment side 9 is formed; when the four-way ball valve 3 is in mode two, when interface three 303 is connected to interface two 302 and interface four 304 is connected to interface one 301, a recovery filtration passage from the equipment side 9 to the oil tank side 1 is formed; therefore, it can be ensured that no matter how the external conveying direction changes, the oil can flow through the gear pump 4 and the filter assembly 6.

[0023] A flow meter 5 is installed between the gear pump 4 and the filter assembly 6, and a buffer tank 7 is installed between the filter assembly 6 and the four-way ball valve 3.

[0024] In this embodiment, by setting a flow meter 5, the oil delivery rate in the pipeline can be monitored in real time, providing feedback data for the variable frequency speed control of the gear pump 4; by setting a buffer tank 7, the hydraulic pulsation generated when the gear pump 4 is working can be effectively absorbed, the pressure fluctuation in the pipeline can be suppressed, and the filtered oil can flow smoothly, avoiding impact on the downstream pipeline.

[0025] A stop valve 1 2 is installed between the oil tank side 1 and the four-way ball valve 3, and a stop valve 2 8 is installed between the oil tank side 1 and the four-way ball valve 3.

[0026] In this embodiment, closing the first shut-off valve 2 and the second shut-off valve 8 first can isolate the equipment side 9 and the oil tank side 1 from the outside, thereby adjusting the connection state of the four-way ball valve 3 under pressureless conditions and preventing oil leakage or accidental splashing during the reversing process.

[0027] Working principle: This application has two working modes during use, specifically: Mode 1: Supply oil from tank side 1 to equipment side 9, see appendix. Figure 1 The specific steps are as follows: First, close shut-off valve 12, shut-off valve 28, and gear pump 4. Then, rotate the four-way ball valve 3 to connect port 1 301 and port 2 302, and port 3 303 and port 4 304. Then, open shut-off valve 12 and shut-off valve 28, and drive gear pump 4. At this time, the oil can flow sequentially along oil tank side 1, shut-off valve 12, four-way ball valve 3 (oil enters from port 1 301 and exits from port 2 302), gear pump 4, flow meter 5, filter assembly 6, buffer tank 7, four-way ball valve 3 (oil enters from port 4 304 and exits from port 3 303), shut-off valve 28, and finally enter equipment side 9. The oil entering equipment side 9 at this time is the oil filtered by filter assembly 6. Mode 2: Transfer the oil from equipment side 9 to oil tank side 1, see appendix. Figure 2 The specific steps are as follows: First, close shut-off valve 12, shut-off valve 28, and gear pump 4. Then, rotate the four-way ball valve 3 to connect port 1 301 and port 4 304 within the four-way ball valve 3, and to connect port 3 303 and port 2 302. Then, open shut-off valve 12 and shut-off valve 28, and drive gear pump 4. At this time, the oil can flow sequentially along equipment side 9, shut-off valve 28, four-way ball valve 3 (oil enters from port 3 303 and exits from port 2 302), gear pump 4, flow meter 5, filter assembly 6, buffer tank 7, four-way ball valve 3 (oil enters from port 4 304 and exits from port 1 301), shut-off valve 12, and finally enter oil tank side 1. The oil entering oil tank side 1 at this time is the oil filtered by filter assembly 6.

[0028] Therefore, when it is necessary to filter the oil in the equipment side 9, firstly, in operating mode 2, the oil in the equipment side 9 is transported to the oil tank side 1. At this time, the filter component 6 can filter the oil. Then, in operating mode 1, the oil in the oil tank side 1 is transported to the equipment side 9. At this time, the filter component 6 can filter the oil again.

[0029] The four-way ball valve model 3 can be used in DN20 (6 points) or DN25 (1 inch) specifications, and its individual weight is controlled at about 1kg, which reduces the weight of the valve body while ensuring the flow rate.

[0030] The gate valve 12 and gate valve 28 models can use DN20 (6 points) or DN25 (1 inch) specifications that match the main oil circuit pipe diameter to ensure consistent connection.

[0031] The gear pump 4 and drive motor model can use the LB-BB20 bidirectional cycloidal gear pump and be driven by the HS130-1300 permanent magnet synchronous motor; the total weight of the combination of the motor and gear pump is only 10.4kg, which is a weight reduction effect compared with the traditional asynchronous motor plus gear pump combination.

[0032] The controller model can be a compact controller adapted to the above permanent magnet synchronous motor, which weighs about 2kg. At the same time, the controller can also be connected to the flow meter 5 signal. Therefore, the controller can adjust the operating frequency of the permanent magnet synchronous motor according to the real-time flow information fed back by the flow meter 5, thereby realizing the frequency conversion speed regulation of the gear pump 4.

[0033] The filter assembly model 6 can use miniaturized and lightweight filter cartridges. The selection criteria are that it can filter large particulate impurities and the flow rate meets the system design requirements, avoiding the use of bulky cast iron housing filters.

[0034] The buffer tank model 7 can use a lightweight 5L tank, weighing approximately 3.26kg. When the buffer capacity requirement is not high, this small capacity size should be selected first to minimize weight (the 10L size of 5.4kg or the 25L size of 9.2kg can also be selected according to the actual working conditions).

[0035] The supporting chassis of this device can be a self-made welded trolley, with an oil pan at the bottom of the trolley, and the overall structure has undergone special weight reduction treatment (such as using hollow tube welding and optimizing the mechanical structure to reduce material usage).

[0036] Therefore, by selecting and optimizing the specific models mentioned above, the total weight of this application can be controlled, thereby achieving lightweighting. This allows the entire oil filter to be easily moved by a trolley, improving the mobility of this application in narrow spaces or complex environments, and thus adapting to the needs of multiple application scenarios.

[0037] Example 2 This embodiment illustrates the control method of the aforementioned variable flow direction circulating filter oil purifier. When it is necessary to filter the oil on the equipment side 9 and then transport it to the oil tank side 1, the following steps are performed: Close the first shut-off valve 2, the second shut-off valve 8, and the gear pump 4; Adjust the four-way ball valve 3 to the second working state so that the first port 301 is connected to the fourth port 304 and the third port 303 is connected to the second port 302; Open the first shut-off valve 2 and the second shut-off valve 8 and start the gear pump 4, so that the oil flows from the equipment side 9 into the four-way ball valve 3 through the third interface 303, then flows out through the second interface 302 and flows through the gear pump 4 and the filter assembly 6 in sequence, and finally returns to the four-way ball valve 3 through the fourth interface 304 and flows out from the first interface 301 to the oil tank side 1.

[0038] When it is necessary to filter the oil on the oil tank side 1 and then transport it to the equipment side 9, the following steps shall be performed: Close the first shut-off valve 2, the second shut-off valve 8, and the gear pump 4; Adjust the four-way ball valve 3 to the first working state so that the first port 301 is connected to the second port 302 and the third port 303 is connected to the fourth port 304; Open the first shut-off valve 2 and the second shut-off valve 8 and start the gear pump 4, so that the oil flows from the oil tank side 1 into the four-way ball valve 3 through the first interface 301, then flows out through the second interface 302 and flows through the gear pump 4 and the filter assembly 6 in sequence, and finally returns to the four-way ball valve 3 through the fourth interface 304 and flows out to the equipment side 9 through the third interface 303.

[0039] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0040] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A variable-flow-direction circulating filtration oil filter, characterized in that, include: A four-way ball valve (3) is provided with a first interface (301), a second interface (302), a third interface (303) and a fourth interface (304); the first interface (301) is used to communicate with the oil tank side (1); the third interface (303) is used to communicate with the equipment side (9); the second interface (302) is connected to the oil inlet of the gear pump (4), the oil outlet of the gear pump (4) is connected to the oil inlet of the filter assembly (6), and the oil outlet of the filter assembly (6) is connected to the fourth interface (304); the four-way ball valve (3) is configured to change the conveying direction of the oil between the oil tank side (1) and the equipment side (9) by switching its internal communication state, while maintaining the flow direction of the oil from the second interface (302) through the gear pump (4) and the filter assembly (6) to the fourth interface (304) unchanged.

2. The variable flow direction circulating filtration oil filter according to claim 1, characterized in that, A flow meter (5) for monitoring flow rate is provided between the gear pump (4) and the filter assembly (6).

3. The variable flow direction circulating filter oil filter according to claim 1, characterized in that, A buffer tank (7) for buffer pressure pulsation is provided between the oil outlet of the filter assembly (6) and the fourth interface (304).

4. The variable flow direction circulating filter oil filter according to claim 1, characterized in that, A first shut-off valve (2) is provided between the oil tank side (1) and the first interface (301), and a second shut-off valve (8) is provided between the equipment side (9) and the third interface (303).

5. A variable flow direction circulating filter oil purifier according to claim 1, characterized in that, The four-way ball valve (3) has a first working state and a second working state; in the first working state, the first interface (301) is connected to the second interface (302), and the third interface (303) is connected to the fourth interface (304); in the second working state, the first interface (301) is connected to the fourth interface (304), and the third interface (303) is connected to the second interface (302).

6. A control method for a variable flow direction circulating filtration oil filter, using the variable flow direction circulating filtration oil filter according to any one of claims 1-5, characterized in that, When it is necessary to filter the oil on the equipment side (9) and then transfer it to the oil tank side (1), the following steps shall be performed: Close the first shut-off valve (2), the second shut-off valve (8), and the gear pump (4); Adjust the four-way ball valve (3) to the second working state so that the first port (301) is connected to the fourth port (304) and the third port (303) is connected to the second port (302); Open the first shut-off valve (2) and the second shut-off valve (8) and start the gear pump (4) so ​​that the oil flows from the equipment side (9) into the four-way ball valve (3) through the third interface (303), then flows out through the second interface (302) and flows through the gear pump (4) and the filter assembly (6) in sequence, and finally returns to the four-way ball valve (3) through the fourth interface (304) and flows out from the first interface (301) to the oil tank side (1).

7. The control method for a variable flow direction circulating filter oil filter according to claim 6, characterized in that, The method further includes: when it is necessary to filter the oil on the tank side (1) and then transport it to the equipment side (9), the following steps are performed: Close the first shut-off valve (2), the second shut-off valve (8), and the gear pump (4); Adjust the four-way ball valve (3) to the first working state so that the first port (301) is connected to the second port (302) and the third port (303) is connected to the fourth port (304); Open the first shut-off valve (2) and the second shut-off valve (8) and start the gear pump (4) so ​​that the oil flows from the oil tank side (1) into the four-way ball valve (3) through the first interface (301), then flows out through the second interface (302) and flows through the gear pump (4) and the filter assembly (6) in sequence, and finally returns to the four-way ball valve (3) through the fourth interface (304) and flows out to the equipment side (9) from the third interface (303).

8. The control method for a variable flow direction circulating filter oil filter according to claim 6, characterized in that, The method further includes: monitoring the oil flow rate through a flow meter (5) and adjusting the speed of the motor driving the gear pump (4) by frequency conversion based on the monitoring results.

9. The control method for a variable flow direction circulating filter oil purifier according to claim 6, characterized in that, Before switching the working state of the four-way ball valve (3), it is determined that the first shut-off valve (2) and the second shut-off valve (8) are in the closed state.

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