Lubricating oil coalescer regenerative purifier

Abstract

The utility model discloses a kind of lubricating oil coalescence regenerative purification oil filter, it is related to lubricating oil regenerative processing equipment technical field, the oil filter includes tank body, by baffle and support bottom plate, the inside of tank is divided into three function chambers of pretreatment cavity, coalescence dehydration cavity and water storage and drainage cavity: electric heater and multilayer filtration assembly are equipped in pretreatment cavity, realize oil heating and preliminary impurity removal;Coalescence dehydration cavity is equipped with annular distribution's lipophilic hydrophobic coalescence filter element, and the outer side of filter element is surrounded with hydrophobic lipophilic oil-water separation membrane A;Water storage and drainage cavity receives sedimentation moisture through support bottom plate oil permeation hole, purified oil liquid is exported through oil outlet pipe, and separated water is discharged through drain pipe.The utility model adopts vertical integrated tank body design, heating, filtration, coalescence dehydration function is integrated in same tank body, without additional connecting pipeline, reduce the floor area;While simplifying the installation process of equipment, reduce the complex pipeline butt joint, reduce installation cost and time.

Description

Technical Field

[0001] This utility model relates to the technical field of lubricating oil regeneration equipment, and more specifically, to a lubricating oil coalescence regeneration purification filter. Background Technology

[0002] As a key auxiliary material in the operation of industrial equipment, lubricating oil's main functions are to reduce friction and wear between equipment components, lower operating temperatures, and provide rust protection. However, during long-term use, lubricating oil inevitably accumulates various contaminants: on the one hand, mechanical impurities such as metal shavings and dust generated during equipment operation become suspended in the oil, disrupting the continuity of the oil film and exacerbating component wear; on the other hand, moisture in the air easily penetrates the oil, not only causing emulsification and reducing its lubricating performance but also potentially leading to corrosion of internal metal components; furthermore, lubricating oil undergoes oxidation reactions under high temperatures and oxygen, generating oxidation products such as organic acids, gums, and asphaltenes, further deteriorating oil quality and causing key indicators such as viscosity and acid value to exceed usage standards, ultimately necessitating replacement.

[0003] Currently, there are two main methods for handling waste lubricating oil: one is to directly discard it and replace it with new oil, which not only causes serious resource waste but may also pollute the environment; the other is to use regeneration and purification equipment to treat the waste lubricating oil to restore its performance. Existing lubricating oil coalescing regeneration and purification filters generally adopt a "decentralized three-tank design," meaning the heating tank, filtration tank, and dehydration tank are three independent devices, connected by multiple pipelines to facilitate oil transfer between them.

[0004] However, this decentralized structure has many drawbacks: First, the equipment occupies a large area, making installation and layout difficult for companies with limited production space; second, the connection of multiple tanks and pipelines complicates the installation process, requiring professional personnel for pipe connection and sealing, increasing installation costs and time; third, leaks at pipe connections can lead to oil leaks and allow external air, dust, and other impurities to enter the oil, causing secondary pollution; simultaneously, oil residues can remain on the inner walls of pipelines during long-distance transport, reducing oil recovery rates and potentially causing deterioration within the pipelines, contaminating subsequent new oil transports; furthermore, the heating efficiency of decentralized tanks is low. Oil heated in the heating tanks cools down during transport to the filtration and dehydration tanks due to heat dissipation, requiring additional heating devices in the filtration or dehydration tanks to ensure subsequent processing effectiveness, resulting in energy waste and failing to meet the development requirements of energy conservation and emission reduction.

[0005] In view of the shortcomings of the existing technology, there is an urgent need for a lubricating oil coalescence regeneration purification filter that is compact in structure, easy to install, highly efficient in purification and low in energy consumption, so as to solve the problems of large footprint, easy generation of secondary pollution and high energy consumption of existing equipment. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a lubricating oil coalescence regeneration purification filter machine, which solves the problems of the dispersed structure, large overall footprint, and complex installation of existing lubricating oil regeneration equipment. This model integrates the various functional modules of the filter machine, reduces the equipment footprint and pipeline connections, and avoids secondary pollution.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A lubricating oil coalescing regeneration purification oil filter includes a tank, a partition, a supporting base plate, an electric heater, a filter assembly, a coalescing filter element, an oil-water separation membrane, and various control valves.

[0009] The tank is a vertical, integrated cylindrical structure made of 304 stainless steel, possessing excellent corrosion resistance and structural strength, capable of withstanding certain oil pressure and heating temperatures. The internal space of the tank is used to install and support various functional components. An oil inlet is located at the center of the top of the tank, equipped with an oil inlet connector with a filter screen, which allows for preliminary filtration of the waste lubricating oil entering the tank, removing larger impurities. A drain pipe is located at the bottom of the tank, and a control valve B is installed on the drain pipe. Control valve B is a manual ball valve, allowing operators to easily control the discharge of water separated from the storage and drainage chambers.

[0010] Both the partition and the supporting base plate are circular stainless steel plates, horizontally installed inside the tank, dividing the internal space of the tank into three independent and interconnected chambers from top to bottom. The space above the partition is a pretreatment chamber, with a height of 2 / 5 of the total tank height, mainly used for heating and preliminary filtration of the lubricating oil. The space between the partition and the supporting base plate is a coalescing and dehydration chamber, with a height of 2 / 5 of the total tank height, mainly used for coalescing and dehydrating the lubricating oil. The space below the supporting base plate is a storage and drainage chamber, with a height of 1 / 5 of the total tank height, mainly used to collect the water separated from the coalescing and dehydration chamber and discharge it through a drain pipe.

[0011] In the above technical solution, the edge of the partition is fixedly connected to the inner wall of the tank by welding to ensure the seal between the pretreatment chamber and the coalescence dehydration chamber; the edge of the supporting base plate is also welded and fixed to the inner wall of the tank.

[0012] The pretreatment chamber is equipped with an electric heater on its inner wall. The electric heater is a spiral heating coil and is electrically connected to a temperature controller on the outside of the tank, allowing for adjustment of the heating power. The electric heater is installed at the upper-middle part of the pretreatment chamber. Its function is to heat the waste lubricating oil entering the pretreatment chamber, controlling the oil temperature between 60-80℃. This temperature range reduces the viscosity of the lubricating oil, facilitating subsequent filtration and water separation, while preventing oxidation and deterioration of the lubricating oil due to excessively high temperatures.

[0013] A filter assembly is provided in the space below the electric heater. The filter assembly is fixedly installed on the upper surface of the partition by a bracket, and the outer diameter of the filter assembly is adapted to the inner diameter of the tank to ensure that the oil can be filtered by the filter assembly before entering the coalescence and dehydration chamber.

[0014] The coalescing dehydration chamber contains four sets of coalescing filter elements, which are evenly distributed in a ring within the chamber. The distance between adjacent sets of filter elements is equal to ensure uniform oil flow through each filter element. An oil-water separation membrane A surrounds the four sets of filter elements. This membrane A is a ring-shaped structure made of polytetrafluoroethylene (PTFE) with a pore size of 0.2 μm, exhibiting hydrophobic and oleophilic properties. The upper end of the membrane A is sealed to the lower surface of a partition plate, and the lower end is sealed to the upper surface of a supporting base plate, dividing the coalescing dehydration chamber into an inner coalescing zone and an outer separation zone. When oil flows out from inside the coalescing filter elements, the water in the oil coalesces into larger droplets under the action of the filter elements. These droplets settle downwards under gravity, while the oil passes through the oil-water separation membrane A into the outer separation zone, achieving initial oil-water separation.

[0015] The support base plate is provided with oil permeable holes evenly distributed in the inner area of ​​the oil-water separation membrane A, which are used to guide the oil and water in the coalescence zone inside the coalescence dehydration chamber into the storage and drainage chamber. Under the action of gravity, the water droplets that settle in the coalescence zone directly enter the storage and drainage chamber through the oil permeable holes.

[0016] Furthermore, a temperature sensor is installed on the top of the tank near the oil inlet. The monitoring end of the temperature sensor extends vertically into the pretreatment chamber and is located below the oil surface. The temperature sensor is electrically connected to an external temperature controller, which can monitor the temperature of the oil in the pretreatment chamber in real time and transmit the temperature signal to the temperature controller. When the oil temperature reaches the set upper limit (80°C), the temperature controller controls the electric heater to stop heating; when the temperature is lower than the set lower limit (60°C), the temperature controller controls the electric heater to start, thereby realizing automatic control of the oil temperature.

[0017] The outer side of the tank is covered with an insulation layer corresponding to the pretreatment chamber. The insulation layer is made of rock wool and is 50mm thick. The outer side of the insulation layer is also wrapped with a stainless steel protective shell, which can effectively reduce the heat loss of the oil in the pretreatment chamber, reduce the energy consumption of the electric heater, and at the same time prevent the temperature of the outer side of the tank from being too high and causing burns to personnel.

[0018] Furthermore, the filter assembly has a multi-layer structure, consisting of a coarse filter plate, a fine filter plate, and adsorption packing from top to bottom. The coarse filter plate is used to filter larger solid impurities, the fine filter plate is used to filter fine impurities, and the adsorption packing is used to adsorb some of the water and oxidation products (such as organic acids, colloids, etc.) in the oil, thereby improving the cleanliness of the oil.

[0019] Furthermore, the coalescing filter element is vertically arranged and made of a polymer coalescing material (such as polypropylene fiber), possessing oleophilic and hydrophobic properties. An internal stainless steel support frame prevents deformation under oil pressure. The upper end of the coalescing filter element is sealed and embedded in a partition plate, with an O-ring rubber seal at the embedding point. This ensures that oil in the pretreatment chamber can only enter the coalescing dehydration chamber through the interior of the coalescing filter element, preventing oil from flowing directly into the coalescing dehydration chamber without coalescing. The lower end of the coalescing filter element is bolted to a supporting base plate, ensuring the stability of the coalescing filter element during equipment operation.

[0020] Furthermore, a mesh bottom plate is provided at a distance from the bottom of the supporting base plate. The mesh bottom plate is a circular stainless steel filter screen used to support the oil-water separation membrane B. The oil-water separation membrane B is provided between the supporting base plate and the mesh bottom plate. The oil-water separation membrane B has oleophobic and hydrophilic properties.

[0021] Furthermore, an oil outlet pipe is connected to the annular surface of the tank body. The position of the oil outlet pipe corresponds to the position of the coalescing dehydration chamber, and its connection point is close to the supporting base plate to ensure that the purified oil in the separation zone of the coalescing dehydration chamber can be completely discharged. A control valve A is installed at the end of the oil outlet pipe. The control valve A is a check valve, which makes it easy for the operator to control the output flow of the purified oil. At the same time, the valve can be closed when the equipment is stopped to prevent the oil from flowing back.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This utility model adopts a vertical integrated tank design, which integrates heating, filtration, coalescing and dehydration functions into the same tank, eliminating the need for additional connecting pipes. The overall equipment occupies only half the area of ​​existing decentralized equipment, greatly saving space. At the same time, it simplifies the equipment installation process, reduces complex pipe connections, and lowers installation costs and time.

[0024] 2. The integrated structure of this utility model eliminates the sealing hazards of pipeline connections in existing equipment. The oil flows in a closed loop inside the tank and will not come into contact with outside air or dust, effectively avoiding secondary pollution. At the same time, the multi-layer design of the filter components and the setting of adsorption packing can efficiently remove mechanical impurities and oxidation products from the oil. The combination of the coalescing filter element and the double-layer oil-water separation membrane (A, B) improves the water removal rate and significantly enhances the quality of the purified oil.

[0025] 3. The insulation layer on the outside of the pretreatment chamber can reduce heat loss and reduce the energy consumption of the electric heater; at the same time, the integrated structure avoids the temperature loss of oil during pipeline transportation, eliminating the need for additional heating devices and further saving energy.

[0026] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0029] Figure 2 This is an overall sectional view of the present invention.

[0030] Figure 3 This is a front sectional view of the present invention.

[0031] Figure 4 This is a partial cross-sectional view of the upper half of the tank in this utility model.

[0032] Figure 5 This is a partial cross-sectional view of the lower half of the tank in this utility model.

[0033] In the diagram: 1. Oil inlet; 2. Insulation layer; 3. Tank body; 4. Oil outlet pipe; 5. Control valve A; 6. Drain pipe; 7. Control valve B; 8. Temperature sensor; 9. Filter assembly; 91. Coarse filter screen; 92. Fine filter screen; 93. Adsorption packing; 10. Baffle plate; 11. Oil-water separation membrane A; 12. Coalescing filter element; 13. Electric heater; 14. Oil-water separation membrane B; 15. Support base plate; 16. Oil perforation hole; 17. Mesh base plate. Detailed Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0035] Example:

[0036] like Figures 1 to 5 As shown, a lubricating oil coalescence regeneration purification filter includes a tank 3, a partition 10, a supporting base plate 15, an electric heater 13, a filter assembly 9, a coalescing filter element 12, an oil-water separation membrane, and various control valves.

[0037] Tank 3 is a vertical, integrated cylindrical structure made of 304 stainless steel, possessing excellent corrosion resistance and structural strength, capable of withstanding certain oil pressure and heating temperatures. The internal space of tank 3 is used to install and support various functional components. An oil inlet 1 is located at the center of the top of tank 3, equipped with an oil inlet connector with a filter screen, which allows for preliminary filtration of the waste lubricating oil entering tank 3, removing larger impurities. A drain pipe 6 is located at the bottom of tank 3, and a control valve B7 is installed on drain pipe 6. Control valve B7 is a manual ball valve, facilitating operator control of the discharge of water separated from the storage and drainage chambers.

[0038] Both the partition plate 10 and the supporting base plate 15 are circular stainless steel plates, horizontally installed inside the tank body 3, used to divide the internal space of the tank body 3 into three independent and interconnected chambers from top to bottom. Among them, the space above the partition plate 10 is the pretreatment chamber, the height of which is 2 / 5 of the total height of the tank body 3, mainly used for heating and preliminary filtration of lubricating oil; the space between the partition plate 10 and the supporting base plate 15 is the coalescence dehydration chamber, the height of which is 2 / 5 of the total height of the tank body 3, mainly used for coalescence dehydration treatment of lubricating oil; the space below the supporting base plate 15 is the storage and drainage chamber, the height of which is 1 / 5 of the total height of the tank body 3, mainly used to collect the water separated from the coalescence dehydration chamber and discharge it through the drain pipe 6.

[0039] In the above technical solution, the edge of the partition plate 10 is fixedly connected to the inner wall of the tank 3 by welding to ensure the seal between the pretreatment chamber and the coalescing dehydration chamber; the edge of the support base plate 15 is also welded and fixed to the inner wall of the tank 3, and the thickness of the support base plate 15 is 12mm, which is 10mm thicker than the partition plate 10, so as to bear the weight of the coalescing filter element 12 and the oil.

[0040] The pretreatment chamber is equipped with an electric heater 13, which is a spiral electric heating coil. The electric heater 13 is electrically connected to a temperature controller on the outside of the tank 3, allowing for adjustment of the heating power. The electric heater 13 is installed at the upper-middle part of the pretreatment chamber. The function of the electric heater 13 is to heat the waste lubricating oil entering the pretreatment chamber, controlling the oil temperature at 60-80℃. This temperature range can reduce the viscosity of the lubricating oil, facilitating subsequent filtration and water separation, while preventing the lubricating oil from oxidizing and deteriorating due to excessively high temperatures.

[0041] A filter assembly 9 is provided in the space below the electric heater 13. The filter assembly 9 is fixedly installed on the upper surface of the partition 10 by a bracket, and the outer diameter of the filter assembly 9 is adapted to the inner diameter of the tank 3 to ensure that the oil can be filtered through the filter assembly 9 before entering the coalescence dehydration chamber.

[0042] The coalescing dehydration chamber is equipped with four sets of coalescing filter elements 12, which are evenly distributed in a ring within the chamber. The distance between adjacent sets of coalescing filter elements 12 is equal to ensure that the oil flows evenly through each coalescing filter element 12. An oil-water separation membrane A11 is provided around the four sets of coalescing filter elements 12. The oil-water separation membrane A11 has a ring structure, is made of polytetrafluoroethylene, and has a pore size of 0.2μm, exhibiting hydrophobic and oleophilic properties. The upper end of the oil-water separation membrane A11 is sealed to the lower surface of the partition plate 10, and the lower end is sealed to the upper surface of the supporting base plate 15, dividing the coalescing dehydration chamber into an inner coalescing zone and an outer separation zone. When the oil flows out from inside the coalescing filter element 12, the water in the oil coalesces into larger water droplets under the action of the coalescing filter element 12. The water droplets settle downwards under the action of gravity, while the oil enters the outer separation zone through the oil-water separation membrane A11, achieving the initial separation of oil and water.

[0043] Oil permeable holes 16 are evenly distributed on the support base plate 15 in the inner area of ​​the oil-water separation membrane A11. These holes are used to guide the oil and water in the coalescence zone inside the coalescence dehydration chamber into the storage and drainage chamber. Under the action of gravity, the water droplets that settle in the coalescence zone directly enter the storage and drainage chamber through the oil permeable holes 16.

[0044] A temperature sensor 8 is installed on the top of the tank 3 near the oil inlet 1. The monitoring end of the temperature sensor 8 extends vertically into the pretreatment chamber and is located below the oil surface. The temperature sensor 8 is electrically connected to an external temperature controller, which can monitor the temperature of the oil in the pretreatment chamber in real time and transmit the temperature signal to the temperature controller. When the oil temperature reaches the set upper limit of 80°C, the temperature controller controls the electric heater 13 to stop heating; when the temperature is lower than the set lower limit of 60°C, the temperature controller controls the electric heater 13 to start, thereby realizing automatic control of the oil temperature.

[0045] The outer side of the tank body 3 is covered with an insulation layer 2 corresponding to the pretreatment chamber. The insulation layer 2 is made of rock wool and is 50mm thick. The outer side of the insulation layer 2 is also wrapped with a stainless steel protective shell, which can effectively reduce the heat loss of the oil in the pretreatment chamber, reduce the energy consumption of the electric heater 13, and at the same time prevent the temperature of the outer side of the tank body 3 from being too high and causing burns to personnel.

[0046] The filter assembly 9 has a multi-layer structure, consisting of a coarse filter plate 91, a fine filter plate 92, and an adsorption filler 93 from top to bottom. The coarse filter plate 91 is made of stainless steel with a mesh size of 100 mesh, capable of filtering mechanical impurities in the oil with a particle size ≥150μm. The fine filter plate 92 is also made of stainless steel with a mesh size of 300 mesh, further filtering fine impurities in the oil with a particle size ≥50μm. The adsorption filler 93 is located below the fine filter plate 92 and consists of activated alumina particles with a particle size of 3-5mm and a filling thickness of 50mm. Activated alumina has a strong adsorption capacity, capable of adsorbing some of the moisture and oxidation products such as organic acids and colloids in the oil, thus improving the cleanliness of the oil.

[0047] The coalescing filter element 12 is vertically arranged and is made of a high-molecular coalescing material such as polypropylene fiber, which has oleophilic and hydrophobic properties. An internal stainless steel support frame prevents deformation of the filter element under oil pressure. The upper end of the coalescing filter element 12 is sealed and embedded in the partition plate 10, with an O-ring rubber seal at the embedding point. This ensures that the oil in the pretreatment chamber can only enter the coalescing dehydration chamber through the interior of the coalescing filter element 12, preventing oil from flowing directly into the coalescing dehydration chamber without coalescing. The lower end of the coalescing filter element 12 is bolted to the support base plate 15, ensuring the stability of the coalescing filter element 12 during equipment operation.

[0048] A mesh bottom plate 17, a circular stainless steel filter screen, is spaced at the bottom of the supporting base plate 15 to support the oil-water separation membrane B14. The oil-water separation membrane B14, which has oleophobic and hydrophilic properties, is positioned between the supporting base plate 15 and the mesh bottom plate 17. Water flows downwards through the oil-water separation membrane B14 under gravity, while oil cannot pass through it and remains in the coalescence dehydration chamber, being discharged through the oil outlet pipe 4. Water, however, passes through the oil-water separation membrane B14 and the mesh bottom plate 17, is stored in the storage and drainage chamber, and is discharged through the drain pipe 6.

[0049] An oil outlet pipe 4 is connected to the ring surface of the tank body 3. The position of the oil outlet pipe 4 corresponds to the position of the coalescing dehydration chamber, and its connection is close to the support base plate 15 to ensure that the purified oil in the separation zone of the coalescing dehydration chamber can be completely discharged. A control valve A5 is installed at the end of the oil outlet pipe 4. The control valve A5 is a check valve, which makes it easy for the operator to control the output flow of the purified oil. At the same time, the valve can be closed when the equipment is stopped to prevent the oil from flowing back.

[0050] The working process of this lubricating oil coalescing regeneration purification oil filter is as follows:

[0051] Lubricating oil enters the pretreatment chamber through the oil inlet 1. Temperature sensor 8 monitors the oil temperature in real time. When the temperature is below 60℃, the temperature controller controls the electric heater 13 to start and heat the oil to 60-80℃. The oil stays in the pretreatment chamber for 10 minutes. During this period, mechanical impurities are removed by passing through the coarse filter plate 91 and fine filter plate 92 of the filter assembly 9, and some moisture and oxidation products are adsorbed by the adsorption filler 93.

[0052] The pretreated oil enters the filter element through the upper end of the coalescing filter element 12. Under the action of the oleophilic and hydrophobic coalescing filter element 12, the water in the oil coalesces into larger water droplets. The oil flows out from the outside of the filter element and is temporarily stored in the inner area of ​​the oil-water separation membrane A11. The water droplets sink down to the top of the support base plate 15 under the action of gravity.

[0053] Settled water droplets enter the storage and drainage chamber through the oil permeation hole 16 of the supporting base plate 15, while the oil cannot pass through the oil-water separation membrane B14. By opening the control valve B7, the water in the storage and drainage chamber can be discharged from the drain pipe 6. The oil undergoes secondary dehydration treatment through the oil-water separation membrane A11. The oil-water separation membrane A11 is a hydrophobic and oleophilic membrane, allowing oil to pass through while preventing water from passing through. Finally, the control valve A5 is opened, and the purified oil is output from the oil outlet pipe 4.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A lubricating oil coalescence regeneration purification filter, characterized in that, include: The tank body (3) is a vertical integrated tank body (3), which is used to install and support various components. It has an oil inlet (1) at the top and a drain pipe (6) at the bottom. A control valve B (7) is installed on the drain pipe (6). The partition (10) and the supporting base plate (15) are used to divide the internal space of the tank (3). The space above the partition (10) is a pretreatment chamber, the space between the partition (10) and the supporting base plate (15) is a coalescence dehydration chamber, and the space below the supporting base plate (15) is a storage and drainage chamber. The pretreatment chamber is equipped with an electric heater (13) on its inner wall for heating the lubricating oil, and a filter assembly (9) is provided in the space below the electric heater (13). The coalescence dehydration chamber is provided with several sets of coalescence filter elements (12), and the oil-water separation membrane A (11) is provided around the outside of the several sets of coalescence filter elements (12). Oil permeable holes (16) are evenly distributed on the support base plate (15) in the inner region of the oil-water separation membrane A (11) to connect the coalescence dehydration chamber with the storage and drainage chamber.

2. The lubricating oil coalescing regeneration purification filter according to claim 1, characterized in that: A temperature sensor (8) is installed on the top of the tank (3), and the monitoring end of the temperature sensor (8) extends into the pretreatment chamber; The outer side of the tank (3) is covered with a heat insulation layer (2) at the position corresponding to the pretreatment cavity.

3. The lubricating oil coalescing regeneration purification filter according to claim 1, characterized in that: The filter assembly (9) has a multi-layer structure, consisting of a coarse filter plate (91), a fine filter plate (92), and an adsorption filler (93) from top to bottom.

4. The lubricating oil coalescing regeneration purification filter according to claim 1, characterized in that: The coalescing filter element (12) is vertically disposed in the coalescing dewatering chamber. Its upper end is sealed and embedded in the partition plate (10), its upper port is connected to the pretreatment chamber, and its lower end is fixedly connected to the support base plate (15).

5. The lubricating oil coalescing regeneration purification filter according to claim 1, characterized in that: The bottom of the supporting base plate (15) is provided with a mesh base plate (17) at intervals, and an oil-water separation membrane B (14) is provided between the supporting base plate (15) and the mesh base plate (17).

6. The lubricating oil coalescing regeneration purification filter according to claim 4, characterized in that: The tank body (3) is connected to an oil outlet pipe (4) on its annular surface. The position of the oil outlet pipe (4) corresponds to the position of the coalescence dehydration chamber, and its connection is close to the support base plate (15). A control valve A (5) is installed at the end of the oil outlet pipe (4).

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