Multistage backflushing device for lubricating oil production

By using the backwash components and warning components of the multi-stage filtration backwash device produced by lubricating oil, the problem of filter clogging is solved, and the regular cleaning of impurities and timely reminders are achieved, ensuring the filtration effect of lubricating oil and the safety of equipment.

CN224321109UActive Publication Date: 2026-06-05BEIERSDORF(TIANJIN)PETROLEUM & CHEM CORP

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
BEIERSDORF(TIANJIN)PETROLEUM & CHEM CORP
Filing Date
2025-07-10
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

During the lubricating oil production process, the filter screen is prone to clogging after prolonged use, making it difficult to clean impurities and affecting the filtration effect.

Method used

The design incorporates a multi-stage filtration backflushing device for lubricant production. This device uses a backflushing component to achieve reverse flow and clean impurities from the filter screen. It is also equipped with a warning component to alert staff when the filter screen becomes clogged. The device can be cleaned automatically or manually.

Benefits of technology

It effectively prevents impurities from accumulating and clogging over a long period of time, ensuring filtration efficiency, cleaning the filter screen in a timely manner, avoiding equipment failure, and improving production efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides lubricating oil production multistage filter backflush device relates to lubricating oil production filter technical field, include: oil storage tank, the one side of oil storage tank is equipped with secondary filter tank, the one side of secondary filter tank is equipped with primary filter tank, and the one side of oil storage tank is equipped with recovery tank, set up backflush subassembly between oil storage tank and primary filter tank, backflush subassembly includes: oil pump, the pipe of removing impurity a, the pipe of removing impurity b, recovery tank, shunt pipe a, shunt pipe b, guide pipe a and guide pipe b. This kind of filter backflush device can clean the impurity accumulated on the top of filter screen by the setting of backflush subassembly, prevent the impurity from being blocked by long -term accumulation, can also clean the filter screen in primary filter tank or secondary filter tank according to the demand, and through the setting of warning subassembly, can close pipeline solenoid valve and open buzzer when filter cavity is blocked, remind staff.
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Description

Technical Field

[0001] This utility model relates to the field of lubricating oil production filtration technology, specifically a multi-stage filtration backflushing device for lubricating oil production. Background Technology

[0002] Lubricating oil is a substance used to reduce friction between two contacting surfaces and is widely used in machinery, automobiles, industrial equipment, and other fields. It reduces wear by forming a protective film between moving parts, and also provides cooling, rust prevention, cleaning, sealing, and buffering functions. During lubricating oil production, to ensure quality, the oil is often filtered multiple times using a filter screen. However, after prolonged use, impurities accumulate on the filter screen, causing blockages, which are difficult to clean. Utility Model Content

[0003] This utility model aims to overcome the shortcomings of the prior art by providing a multi-stage filtration backflushing device for lubricating oil production. To solve the above problems, the backflushing component allows for the manual and periodic cleaning of impurities accumulated on the top of the filter screen by reverse-flowing lubricating oil, preventing long-term accumulation of impurities and blockage. It can also be used to clean the filter screens inside the primary or secondary filter box as needed. Furthermore, the warning component can close the pipeline solenoid valve and activate the buzzer when the filter chamber is blocked to alert the staff.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage filtration backflushing device for lubricating oil production, comprising: an oil storage tank, a secondary filter box on one side of the oil storage tank, a primary filter box on one side of the secondary filter box, a recovery tank on one side of the oil storage tank, a backflushing assembly disposed between the oil storage tank and the primary filter box, the backflushing assembly comprising: an oil pump, a waste discharge pipe a, a waste discharge pipe b, a recovery tank, a diversion pipe a, a diversion pipe b, a guide pipe a, and a guide pipe b, and an alarm assembly disposed inside the primary filter box and the secondary filter box, the alarm assembly comprising: an indicator light, a buzzer, a pressure sensor, a piston, a spring, and a microcontroller.

[0005] Furthermore, a filter screen is fixedly installed inside the recycling bin, an oil drain pipe is provided on one side of the recycling bin, a discharge pipe is provided on one side of the oil storage tank, an oil inlet pipe is connected to the top of the primary filter box, and a solenoid valve is provided on the oil inlet pipe.

[0006] Furthermore, the primary filter box has a primary filter chamber a and a primary filter chamber b inside. The secondary filter box has a filter chamber a and a filter chamber b inside. An oil pump is fixedly installed on the top of the oil storage tank. An oil pump pipe is fixedly connected to the bottom of the oil pump. The bottom end of the oil pump pipe extends into the interior of the oil storage tank.

[0007] Furthermore, a filter screen a is fixedly installed inside the primary filter chamber a, and a filter screen b is fixedly installed inside the primary filter chamber b. Oil guide pipes a are connected between the primary filter chamber a and the primary filter chamber b, and between the filter chamber a and the filter chamber b. A secondary filter screen a is fixedly installed inside the filter chamber a, and a secondary filter screen b is fixedly installed inside the filter chamber b. An oil guide pipe b is fixedly connected to the bottom of the inner wall of the primary filter chamber b, with one end of the oil guide pipe b extending into the filter chamber a. An oil guide pipe c is fixedly connected to the bottom of the inner wall of the filter chamber b, with one end of the oil guide pipe c connected to the oil storage tank. Solenoid valves are provided on each of the oil guide pipes a, b, and c.

[0008] Furthermore, an oil outlet pipe is connected to one side of the oil pump. One end of the oil outlet pipe is connected to a guide pipe a via a tee pipe, and another end of the oil outlet pipe is connected to a guide pipe b via a tee pipe. Both the guide pipe b and the guide pipe a are connected to a branch pipe a via a tee pipe, and both the guide pipe b and the guide pipe a are connected to a branch pipe b via a tee pipe. Solenoid valves are provided on both the branch pipes a and b. The branch pipe a at one end of the guide pipe b extends into the primary filter chamber a, the branch pipe b at one end of the guide pipe b extends into the primary filter chamber b, the branch pipe a at one end of the guide pipe a extends into the filter chamber a, and the branch pipe b at one end of the guide pipe a extends into the filter chamber b.

[0009] Furthermore, a discharge pipe a is connected to the primary filter chamber a and one side of the inner wall of the filter chamber a, and a discharge pipe b is connected to the primary filter chamber b and one side of the inner wall of the filter chamber b. One end of the discharge pipe b is connected to the discharge pipe a, and both the discharge pipe a and the discharge pipe b are equipped with solenoid valves.

[0010] Furthermore, each of the primary filter chamber a, the primary filter chamber b, the filter chamber a, and the filter chamber b has a squeezing groove on one side of its inner wall. A piston is installed inside the squeezing groove, and a pressure rod is fixedly installed at one end of the piston. A spring cavity is opened on one side of the squeezing groove, and one end of the pressure rod extends into the spring cavity. A placement cavity is opened on one side of the spring cavity, and a top rod is fixedly connected to one end of the pressure rod. One end of the top rod extends into the placement cavity, and a spring is sleeved on the outside of the top rod. A pressure sensor is fixedly installed in the placement cavity.

[0011] Furthermore, both the primary filter box and the secondary filter box are equipped with microcontrollers, buzzers are fixedly installed on the top of both the primary filter box and the secondary filter box, and indicator lights are fixedly installed on the top of both the primary filter box and the secondary filter box.

[0012] This utility model provides a multi-stage filtration backflushing device for lubricating oil production, which has the following beneficial effects:

[0013] The advantage of this utility model is that, by setting up the backwash component, the impurities accumulated on the top of the filter screen can be cleaned manually and periodically by using the reverse-flowing lubricating oil, preventing the impurities from accumulating for a long time and causing blockage. At the same time, the filter screen inside the primary filter box or the secondary filter box can be cleaned as needed.

[0014] Secondly, by setting the warning component, the pipeline solenoid valve can be closed and the buzzer can be turned on when the filter chamber is blocked to remind the staff. At the same time, when the staff cannot respond quickly and the pressure inside the filter chamber continues to increase, the oil pump can be automatically turned on to clean the impurities. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0017] Figure 3 This is a cross-sectional view of the secondary filter box structure of this utility model.

[0018] Figure 4 This is a cross-sectional view of the primary filter box structure of this utility model.

[0019] Figure 5 This is a schematic diagram of the recycling bin structure of this utility model.

[0020] Figure 6 This is a cross-sectional view of the recycling bin structure of this utility model.

[0021] Figure 7 For the present utility model Figure 2Enlarged view of point A.

[0022] Figure 1-7 In the middle section: 1. Oil storage tank; 101. Oil pump; 102. Oil suction pipe; 103. Oil outlet pipe; 104. Guide pipe a; 105. Guide pipe b; 106. Diverter pipe a; 107. Diverter pipe b; 2. Primary filter box; 201. Primary filter chamber a; 202. Primary filter chamber b; 203. Filter screen a; 204. Filter screen b; 205. Microcontroller; 3. Secondary filter box; 301. Filter chamber a; 302. Filter chamber b; 303. 4. Secondary filter a; 304, Secondary filter b; 4. Waste discharge pipe a; 401, Waste discharge pipe b; 5. Oil guide pipe a; 501, Oil guide pipe b; 502, Oil guide pipe c; 503, Oil inlet pipe; 6. Spring cavity; 601, Extrusion groove; 602, Placement cavity; 603, Pressure sensor; 604, Piston; 605, Pressure rod; 606, Push rod; 607, Spring; 7. Indicator light; 701, Buzzer; 8. Recovery box; 801, Filter screen. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] This application provides a multi-stage filtration backflushing device for lubricating oil production. This device, through the backflushing components, allows for the manual, periodic cleaning of impurities accumulated on the top of the filter screen using reverse-flowing lubricating oil, preventing long-term blockage. It also allows for selective cleaning of the filter screens inside the primary or secondary filter box, as needed. Furthermore, an alarm component activates when the filter chamber is blocked, closing the pipeline solenoid valve and sounding a buzzer to alert personnel. The following provides a detailed description of this multi-stage filtration backflushing device for lubricating oil production. It should be noted that the order of description in the following embodiments is not intended to limit the preferred order of the embodiments.

[0026] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] Please see Figure 1-7 The multi-stage filtration backflushing device for lubricating oil production provided in this embodiment includes: an oil storage tank 1, a secondary filter box 3 on one side of the oil storage tank 1, a primary filter box 2 on one side of the secondary filter box 3, and a recovery box 8 on one side of the oil storage tank 1; a backflushing assembly located between the oil storage tank 1 and the primary filter box 2, the backflushing assembly including: an oil pump 101, a waste discharge pipe a4, a waste discharge pipe b401, a recovery box 8, a diversion pipe a106, a diversion pipe b107, a guide pipe a104, and a guide pipe b105; and a warning assembly located inside the primary filter box 2 and the secondary filter box 3, the warning assembly including: an indicator light 7, a buzzer 701, a pressure sensor 603, a piston 604, a spring 607, and a microcontroller 205.

[0028] The backwash component allows for manual, periodic cleaning of the impurities accumulated on the top of the filter screen using reverse-flowing lubricating oil, preventing long-term buildup and blockage. It also allows for cleaning of the filter screens inside the primary filter box 2 or the secondary filter box 3 as needed.

[0029] Secondly, by setting the warning component, the pipeline solenoid valve can be closed and the buzzer 701 can be turned on when the filter chamber is blocked to remind the staff. At the same time, when the staff cannot respond quickly and the pressure inside the filter chamber continues to increase, the oil pump 101 can be automatically turned on to clean the impurities.

[0030] Example 2

[0031] Based on Embodiment 1, a filter screen 801 is fixedly installed inside the recovery box 8. An oil drain pipe is provided on one side of the recovery box 8, and a discharge pipe is provided on one side of the oil storage tank 1. An oil inlet pipe 503 is connected to the top of the primary filter box 2, and a solenoid valve is installed on the oil inlet pipe 503. The primary filter box 2 has a primary filter chamber a201 and a primary filter chamber b202. The secondary filter box 3 has a filter chamber a301 and a filter chamber b302. An oil pump 101 is fixedly installed on the top of the oil storage tank 1, and an oil suction pipe 102 is fixedly connected to the bottom of the oil pump 101, with the bottom end of the oil suction pipe 102 extending into the oil storage tank 1. A filter screen a203 is fixedly installed inside the primary filter chamber a201. A filter screen b204 is fixedly installed inside the primary filter chamber b202. An oil guide pipe a5 is connected between the primary filter chambers a201 and b202, and between the filter chambers a301 and b302. A secondary filter screen a303 is fixedly installed inside the filter chamber a301, and a secondary filter screen b304 is fixedly installed inside the filter chamber b302. An oil guide pipe b501 is fixedly connected to the bottom of the inner wall of the primary filter chamber b202, with one end of the oil guide pipe b501 extending into the filter chamber a301. An oil guide pipe c502 is fixedly connected to the bottom of the inner wall of the filter chamber b302, with one end of the oil guide pipe c502 connected to the oil storage tank 1. A solenoid valve is installed on each of the oil guide pipes a5, b501, and c502.

[0032] During normal lubricating oil filtration, the solenoid valves on oil guide pipes a5, b501, c502, and inlet pipe 503 can be opened by the controller located on one side of the oil reservoir 1. Lubricating oil is then introduced into the inlet pipe 503, allowing it to pass through the primary filter chambers a201 and b202, and through the oil guide pipe b501 into the filter chambers a301 and b302. Finally, it flows into the oil reservoir 1 through the oil guide pipe c502. During this process, filter screens a203, b204, a303, and b304 can filter impurities inside the lubricating oil.

[0033] The oil pump 101 is connected to an oil outlet pipe 103 on one side. One end of the oil outlet pipe 103 is connected to a guide pipe a104 via a tee pipe, and another end of the oil outlet pipe 103 is connected to a guide pipe b105 via a tee pipe. Both guide pipe b105 and guide pipe a104 are connected to a diverter pipe a106 via a tee pipe, and both guide pipe b105 and guide pipe a104 are connected to a diverter pipe b107 via a tee pipe. Solenoid valves are installed on both diverter pipes a106 and b107. One end of the diverter pipe a106 at the guide pipe b105 extends into the primary filter chamber a201. One end of the guide pipe b105 extends into the primary filter chamber b202 via a branch pipe b107. One end of the guide pipe a104 extends into the filter chamber a301 via a branch pipe a106. One end of the guide pipe a104 extends into the filter chamber b302 via a branch pipe b107. A drain pipe a4 is connected to one side of the inner wall of the primary filter chamber a201 and the filter chamber a301. A drain pipe b401 is connected to one side of the inner wall of the primary filter chamber b202 and the filter chamber b302. One end of the drain pipe b401 is connected to the drain pipe a4. Both the drain pipe a4 and the drain pipe b401 are equipped with solenoid valves.

[0034] When it is necessary to periodically clean the impurities accumulated on the top of filters A203, B204, A303, and B304, the operator can use the controller on one side of the oil storage tank 1 to close the solenoid valves on oil guide pipes A5, B501, C502, and 503, and open the solenoid valves on drain pipe A4, diversion pipe A106, drain pipe B401, and diversion pipe B107 as needed. Then, the operator can start the oil pump 1 via the controller. 01. The filtered lubricating oil inside the oil storage tank 1 is drawn and flows through the oil outlet pipe 103 into the guide pipe a104 and guide pipe b105, respectively into the filter chamber a301 and primary filter chamber a201, as well as the filter chamber b302 and primary filter chamber b202. Impurities are carried into the discharge pipe a4 and discharge pipe b401 and flow into the recovery tank 8. At this time, the impurities can be filtered out by the filter screen 801. Then, the lubricating oil is discharged through the oil drain pipe on one side of the recovery tank 8, thus recovering the lubricating oil.

[0035] Example 3

[0036] Based on Embodiment 1, each of the primary filter chambers a201, b202, a301, and b302 has a compression groove 601 on one side of its inner wall. A piston 604 is located inside the compression groove 601, and a pressure rod 605 is fixedly installed at one end of the piston 604. A spring cavity 6 is located on one side of the compression groove 601, and one end of the pressure rod 605 extends into the spring cavity 6. A placement cavity 602 is located on one side of the spring cavity 6, and a top rod 606 is fixedly connected to one end of the pressure rod 605. One end of the top rod 606 extends into the placement cavity 602, and a spring 607 is sleeved on the outside of the top rod 606. A pressure sensor 603 is fixedly installed in the placement cavity 602. Both the primary filter box 2 and the secondary filter box 3 have a microcontroller 205 inside. A buzzer 701 is fixedly installed on the top of both the primary filter box 2 and the secondary filter box 3, and an indicator light 7 is fixedly installed on the top of both the primary filter box 2 and the secondary filter box 3.

[0037] During normal use, the lubricating oil inside the primary filter box 2 and the secondary filter box 3 pushes the piston 604 and the pressure rod 605 towards the pressure sensor 603, thereby squeezing the spring 607 and causing the push rod 606 to press against the pressure sensor 603. When impurities accumulate on filter screens a203, b204, a303, or b304 and cause blockage, the pressure inside the cavity will continuously increase with the continuous input of lubricating oil. At this time, the pressure applied to the pressure sensor 603 by the push rod 606 will also gradually increase. When this pressure reaches a preset threshold, the pressure sensor 603 will generate an electrical signal and transmit it to the microcontroller 205. The microcontroller 205 will then activate the indicator light 7 and the buzzer 701 to alert nearby personnel. If the personnel fail to take appropriate measures in time, causing the pressure inside the cavity to continue to rise, the pressure sensor 603 will... 03 will generate an electrical signal again and transmit it to the microcontroller 205. The microcontroller 205 will close the solenoid valves on the oil guide pipe a5, oil guide pipe b501, oil guide pipe c502 and oil inlet pipe 503, and open the solenoid valves on the drain pipe a4, diverter pipe a106 and drain pipe b401 and diverter pipe b107. It will also start the oil pump 101 to draw lubricating oil from the oil storage tank 1 and clean the primary filter chamber a201, primary filter chamber b202 and filter chamber a3. Impurities inside filter chambers 01 and b302 are backflushed, causing them to enter the recovery tank 8 through discharge pipes a4 and b401. This prevents the primary filter tank 2 and secondary filter tank 3 from exploding due to excessive internal pressure. Finally, the operator can shut off the oil pump 101 through the controller on one side of the oil storage tank 1, thus terminating the cleaning operation of the impurities on the top of filter screens a203, b204, secondary filter screens a303 and b304.

[0038] Furthermore, the pressure sensor 603 is a GZP182 type piezoresistive pressure sensor chip. Its core component is a silicon piezoresistive pressure sensitive chip fabricated using MEMS technology. This pressure sensitive chip consists of an elastic diaphragm and four resistors integrated on the diaphragm. The four piezoresistors form a Wheatstone bridge structure. When pressure is applied to the elastic diaphragm, the bridge generates a voltage output signal that is linearly proportional to the applied pressure. The pressure sensor 603 is a mature and conventional technology in this field, and this solution does not improve the circuit or program of the pressure sensor 603. Therefore, the circuit and signal connection relationship of the pressure sensor 603 will not be described in detail.

[0039] The control program involved in this utility model can be implemented by those skilled in the art based on the same or similar principles in the prior art, and this part is not the innovation of this utility model.

[0040] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0041] The multi-stage filtration backflushing device for lubricating oil production provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A multi-stage filtration backwashing device for lubricating oil production, characterized in that, include: An oil storage tank (1) is provided with a secondary filter box (3) on one side of the oil storage tank (1), a primary filter box (2) on one side of the secondary filter box (3), and a recovery box (8) on one side of the oil storage tank (1). A backflushing assembly is provided between the oil storage tank (1) and the primary filter box (2). The backflushing assembly includes: an oil pump (101), a waste pipe a (4), a waste pipe b (401), a recovery tank (8), a diversion pipe a (106), a diversion pipe b (107), a guide pipe a (104), and a guide pipe b (105). The warning components are located inside the primary filter box (2) and the secondary filter box (3). The warning components include: indicator light (7), buzzer (701), pressure sensor (603), piston (604), spring (607) and microcontroller (205).

2. The multi-stage filtration backwashing device for lubricating oil production according to claim 1, characterized in that, The recycling box (8) is fixedly installed with a filter screen (801). The recycling box (8) has an oil drain pipe on one side and an oil storage tank (1) has a discharge pipe on one side. The primary filter box (2) is connected to an oil inlet pipe (503) at the top and has a solenoid valve on the oil inlet pipe (503).

3. The multi-stage filtration backwashing device for lubricating oil production according to claim 1, characterized in that, The primary filter box (2) has a primary filter chamber a (201) inside, the primary filter box (2) has a primary filter chamber b (202) inside, the secondary filter box (3) has a filter chamber a (301) inside, the secondary filter box (3) has a filter chamber b (302) inside, the oil storage tank (1) is fixedly installed with an oil pump (101) at the top, the oil pump (101) is fixedly connected with an oil suction pipe (102) at the bottom, and the bottom end of the oil suction pipe (102) extends into the oil storage tank (1).

4. The multi-stage filtration backwashing device for lubricating oil production according to claim 3, characterized in that, A filter screen a (203) is fixedly installed inside the primary filter chamber a (201), and a filter screen b (204) is fixedly installed inside the primary filter chamber b (202). Oil guide pipes a (5) are connected between the primary filter chamber a (201) and the primary filter chamber b (202), and between the filter chamber a (301) and the filter chamber b (302). A secondary filter screen a (303) is fixedly installed inside the filter chamber a (301), and a filter screen b (204) is fixedly installed inside the filter chamber b (302). The filter is equipped with a secondary filter screen b (304). The bottom of the inner wall of the primary filter chamber b (202) is fixedly connected to an oil guide pipe b (501). One end of the oil guide pipe b (501) extends into the filter chamber a (301). The bottom of the filter chamber b (302) is fixedly connected to an oil guide pipe c (502). One end of the oil guide pipe c (502) is connected to the oil storage tank (1). Solenoid valves are provided on the oil guide pipe a (5), the oil guide pipe b (501) and the oil guide pipe c (502).

5. The multi-stage filtration backflushing device for lubricating oil production according to claim 3, characterized in that, One side of the oil pump (101) is connected to an oil outlet pipe (103). One end of the oil outlet pipe (103) is connected to a guide pipe a (104) via a tee pipe. The other end of the oil outlet pipe (103) is connected to a guide pipe b (105) via a tee pipe. One end of both the guide pipe b (105) and the guide pipe a (104) is connected to a branch pipe a (106) via a tee pipe. One end of both the guide pipe b (105) and the guide pipe a (104) is connected to a branch pipe b (107) via a tee pipe. The two branch pipes a (106) and the two... Each of the diversion pipes b (107) is equipped with a solenoid valve. One end of the diversion pipe a (106) of the guide pipe b (105) extends into the primary filter chamber a (201). One end of the diversion pipe b (107) of the guide pipe b (105) extends into the primary filter chamber b (202). One end of the diversion pipe a (106) of the guide pipe a (104) extends into the filter chamber a (301). One end of the diversion pipe b (107) of the guide pipe a (104) extends into the filter chamber b (302).

6. The multi-stage filtration backwashing device for lubricating oil production according to claim 3, characterized in that, The primary filter chamber a (201) and the filter chamber a (301) are connected to a drain pipe a (4) on one side of their inner walls. The primary filter chamber b (202) and the filter chamber b (302) are connected to a drain pipe b (401) on one side of their inner walls. One end of the drain pipe b (401) is connected to the drain pipe a (4). Both the drain pipe a (4) and the drain pipe b (401) are equipped with solenoid valves.

7. The multi-stage filtration backflushing device for lubricating oil production according to claim 3, characterized in that, Each of the primary filter chambers a (201), b (202), a (301), and b (302) has a squeezing groove (601) on one side of its inner wall. A piston (604) is provided inside the squeezing groove (601). A pressure rod (605) is fixedly installed at one end of the piston (604). A spring cavity (6) is provided on one side of the squeezing groove (601). One end of the pressure rod (605) extends into the spring cavity (6). A placement cavity (602) is provided on one side of the spring cavity (6). A top rod (606) is fixedly connected to one end of the pressure rod (605). One end of the top rod (606) extends into the placement cavity (602). A spring (607) is sleeved on the outside of the top rod (606). A pressure sensor (603) is fixedly installed in the placement cavity (602).

8. The multi-stage filtration backflushing device for lubricating oil production according to claim 1, characterized in that, Both the primary filter box (2) and the secondary filter box (3) are equipped with a microcontroller (205). Both the primary filter box (2) and the secondary filter box (3) are fixedly installed with a buzzer (701) on the top. Both the primary filter box (2) and the secondary filter box (3) are fixedly installed with an indicator light (7).