High-precision oil cooling machine

Abstract

The application discloses a high-precision oil cooler and relates to the technical field of oil coolers, which is characterized in that the technical key points include a shell and a control module fixedly installed on the shell, a refrigeration circulation structure and an oil filtering structure are arranged in the shell, the oil filtering structure includes a filter shell body fixedly installed on the inner wall of the shell through a fixing buckle, a center cylinder is arranged in the inner cavity of the filter shell body, a shell cover is rotationally and sealingly connected to the top end of the center cylinder, the shell cover is in threaded connection with the shell, a ring-shaped oil box matched with the center cylinder is fixedly installed at the bottom of the shell cover, the ring-shaped oil box, the driving blade and the forced guiding structure of the telescopic oil discharge pipe are combined with the folding filter core rotation, the arc-shaped limiting block, the cleaning shaft ring and the cleaning scraping rod are matched to scrape off impurities, the filter paper support frame is used to fix the filter core form, the disadvantages of the traditional natural flow of oil are solved, uneven impurity adhesion and local blockage are avoided, the filtering efficiency is maintained, and the flow resistance is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil cooler technology, specifically a high-precision oil cooler. Background Technology

[0002] Oil coolers are core temperature control devices for cooling industrial oils such as lubricating oil and hydraulic oil in industrial production. They are widely used in various scenarios requiring stable oil temperatures, such as machine tool processing, hydraulic system operation, and compressor operation. Through a built-in refrigeration system (commonly shell-and-tube or plate heat exchange structures, which have the advantages of large heat exchange area and high heat transfer efficiency), they can efficiently exchange heat with the circulating oil, quickly removing excess heat generated by the oil under high-speed operation and high-pressure conditions. This precisely maintains the oil within the optimal operating temperature range of 30-55℃, fundamentally preventing problems such as viscosity decrease, abnormal flow, oxidation and deterioration, or lubrication failure caused by high oil temperatures. These problems not only accelerate the aging of equipment seals and increase frictional wear of core components, but may also cause sudden shutdown failures. Through precise temperature control, oil coolers can effectively protect key components such as machine tool spindles, hydraulic valve groups, and compressor cylinders, significantly reducing wear and failure rates, ensuring the continuity and stability of the production process, and allowing the equipment to operate efficiently under rated conditions, reducing energy consumption and extending the service life of the entire machine and the oil replacement cycle.

[0003] Typically, the equipment uses a matching gear pump or vane pump to draw out the internal circulating oil, which is then introduced into the cooling circuit of the oil cooler through oil-resistant rubber hoses or stainless steel conduits. The oil entering the oil cooler first flows through the built-in oil filter. The core function of this filter is to intercept impurities such as metal shavings, dust particles, and sludge mixed in with the oil, preventing these contaminants from scratching precision heat exchange components, clogging pipe passages, or interfering with the normal operation of the refrigeration system.

[0004] However, in actual use, the oil lacks a forced guiding structure and flows freely into the oil cavity formed by the filter paper and oil filter, relying solely on its own gravity or system pressure. This natural flow method easily leads to impurities in the oil forming an uneven adhesion layer on the surface of the filter paper, and some areas may even experience early blockage. This not only gradually reduces the filtration efficiency but also increases the oil flow resistance, indirectly affecting the heat exchange effect of the oil cooler and the operational stability of the entire circulation system. Therefore, we propose a new type of high-precision oil cooler. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a high-precision oil cooler that can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-precision oil cooler, comprising a housing and a control module fixedly mounted on the housing, wherein the housing is provided with a refrigeration circulation structure and an oil filtration structure.

[0007] The oil filtration structure includes a filter housing fixedly installed on the inner wall of the outer shell via a fixing buckle. The inner cavity of the filter housing has a central cylinder. A housing cover is rotatably and sealingly connected to the top of the central cylinder, and the housing cover is threadedly connected to the outer shell. An annular oil box adapted to the central cylinder is fixedly installed at the bottom of the housing cover. Several drive blades located within the annular oil box are fixedly installed on the central cylinder. A hollow oil guide pipe communicating with the inner cavity of the annular oil box is fixedly installed at the bottom of the annular oil box. A telescopic spring is fixedly installed on the inner wall of the hollow oil guide pipe via a cross. A telescopic oil drain pipe adapted to the hollow oil guide pipe is fixedly connected to the lower end of the telescopic spring, and the lower end of the telescopic spring is fixedly installed at the top of the telescopic oil drain pipe. The telescopic oil drain pipe is slidably connected to the hollow oil guide pipe. Several oil drain holes are opened on the telescopic oil drain pipe. Several arc-shaped limiting blocks are fixedly installed on the telescopic oil drain pipe. A cleaning collar is rotatably connected to the arc-shaped limiting blocks. Several equally spaced cleaning scrapers are fixedly installed on the inner circular surface of the cleaning collar.

[0008] Preferably, the central cylinder has a plurality of evenly distributed oil leakage holes; the outer circular surface of the cleaning collar has an annular limiting groove, wherein the arc-shaped limiting block is adapted to the annular limiting groove, and the arc-shaped limiting block is rotatably connected in the annular limiting groove.

[0009] Preferably, an oil injection bend that penetrates the housing cover, the annular oil box, and the outer shell is fixedly installed on the housing cover.

[0010] Preferably, a base plate is fixedly installed at the bottom end of the central cylinder, and an oil inlet groove is provided on the base plate; a valve spring is fixedly installed on the inner wall of the central cylinder by a cross, and a bypass valve block adapted to the oil inlet groove is fixedly installed on the valve spring; and a top plate is fixedly installed at the top end of the central cylinder.

[0011] Preferably, a plurality of filter paper support frames adapted to the central cylinder are fixedly installed on the outer side of the central cylinder, and a pleated filter element adapted to the filter paper support frame is provided on the outer side of the filter paper support frame. The pleated filter element is located between the bottom plate and the top plate; the cleaning scraper is adapted to the pleated filter element and contacts the pleated filter element.

[0012] Preferably, the refrigeration cycle structure includes a compressor fixedly installed at the bottom of the inner cavity of the outer casing, a condenser fixedly connected to the compressor via a conduit, a high-precision heat exchanger connected to the output end of the condenser via a conduit, and a refrigerant outlet end of the high-precision heat exchanger fixedly connected to the refrigerant inlet port on the compressor via a conduit.

[0013] Preferably, a rotary joint is fixedly installed at the top of the central cylinder, and the rotary joint is fixedly connected to the oil inlet port of the high-precision heat exchanger through a conduit. The oil outlet port of the high-precision heat exchanger is fixedly connected to a room-temperature oil drain pipe that penetrates the outer shell.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By setting up a ring-shaped oil box, a forced guiding structure that works in conjunction with the drive blades and the telescopic oil drain pipe, and combining it with the rotation of the folded filter element, forced directional injection of oil is achieved, which solves the drawbacks of traditional natural oil flow and avoids uneven adhesion of impurities on the filter element surface.

[0016] 2. By setting arc-shaped limit blocks, cleaning collars and cleaning scrapers, and coordinating the up-and-down reciprocating motion of the telescopic oil drain pipe, impurities on the filter element surface are scraped, preventing localized early blockage, maintaining stable filtration efficiency, and reducing oil flow resistance.

[0017] 3. By setting up a filter paper support frame and a cleaning scraper and cleaning collar in a coordinated structure, the folded structure of the folded filter element can be limited and fixed, ensuring that each fold maintains a regular shape, without the need for additional fixing by applying glue or other methods. Attached Figure Description

[0018] Figure 1 This is a complete structural schematic diagram of the present invention;

[0019] Figure 2 For the present invention Figure 1 Another perspective structural diagram;

[0020] Figure 3 For the present invention Figure 1 A schematic diagram of the cross-sectional structure;

[0021] Figure 4 This is a schematic diagram of the oil filtration structure of the present invention;

[0022] Figure 5 For the present invention Figure 4 A schematic diagram of the cross-sectional structure;

[0023] Figure 6 This is a schematic diagram of the structure of the central cylinder, pleated filter element, and hollow oil guide tube of the present invention.

[0024] Figure 7 For the present invention Figure 5 A partially enlarged structural diagram;

[0025] Figure 8 This is a schematic diagram of the hollow oil guide pipe and telescopic oil drain pipe in this invention;

[0026] Figure 9 For the present inventionFigure 8 A partially enlarged structural diagram.

[0027] In the picture:

[0028] 1. Outer shell; 2. Refrigeration cycle structure; 21. Compressor; 22. Condenser; 23. High-precision heat exchanger; 3. Oil filtration structure; 31. Filter housing; 32. Central cylinder; 33. Housing cover; 34. Annular oil box; 35. Hollow oil guide pipe; 36. Telescopic spring; 37. Telescopic oil drain pipe; 38. Oil drain hole; 39. Arc-shaped limit block; 310. Cleaning collar; 311. Cleaning scraper; 312. Oil injection bend; 313. Base plate; 314. Valve spring; 315. Bypass valve block; 316. Top plate; 317. Filter paper support frame; 318. Folded filter element; 319. Drive blade; 4. Rotary joint; 5. Normal temperature oil drain pipe. Detailed Implementation

[0029] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0030] This invention provides a technical solution:

[0031] Please see Figures 1-9 A high-precision oil cooler includes a housing 1 and a control module fixedly mounted on the housing 1. The housing 1 contains a refrigeration circulation structure 2 and an oil filtration structure 3. The oil filtration structure 3 includes a filter housing 31 fixedly mounted on the inner wall of the housing 1 via a fixing buckle. A central cylinder 32 is located within the inner cavity of the filter housing 31. A housing cover 33 is rotatably and sealingly connected to the top of the central cylinder 32 and is threadedly connected to the housing 1. An annular oil box 34, adapted to the central cylinder 32, is fixedly mounted at the bottom of the housing cover 33. Several drive blades 319 located within the annular oil box 34 are fixedly mounted on the central cylinder 32. A series of drive blades 319 are fixedly mounted on the bottom of the annular oil box 34. A hollow oil guide pipe 35 communicates with the inner cavity of the annular oil box 34. A telescopic spring 36 is fixedly installed on the inner wall of the hollow oil guide pipe 35 by a cross. The lower end of the telescopic spring 36 is fixedly connected to a telescopic drain pipe 37 adapted to the hollow oil guide pipe 35. The lower end of the telescopic spring 36 is fixedly installed on the top end of the telescopic drain pipe 37. The telescopic drain pipe 37 is slidably connected to the hollow oil guide pipe 35. Several oil drain holes 38 are opened on the telescopic drain pipe 37. Several arc-shaped limiting blocks 39 are fixedly installed on the telescopic drain pipe 37. A cleaning collar 310 is rotatably connected to the arc-shaped limiting blocks 39. Several equally spaced cleaning scrapers 311 are fixedly installed on the inner circular surface of the cleaning collar 310.

[0032] After the oil is introduced into the annular oil box 34 through the oil injection bend 312, it impacts the drive blades 319 on the central cylinder 32 (the drive blades 319 can be set to different sizes to facilitate rotation under the push of the oil) and drives the central cylinder 32 to rotate. On the other hand, it flows into the hollow oil guide pipe 35, and through the pressure change, it pushes the telescopic oil drain pipe 37 (which slides up and down with the extension and retraction of the telescopic spring 36). The oil is then sprayed directionally into the rotating folded filter element 318 through the oil drain hole 38. The arc-shaped limit block 39 plays a role in limiting the rotation of the cleaning collar 310. The cleaning scraper 311 on the cleaning collar 310 moves up and down with the telescopic oil drain pipe 37 to scrape the impurities of the filter element. The filter housing 31 provides an installation cavity for the oil filtration structure 3. The housing cover 33 achieves sealing and fixation and cooperates with the outer shell 1 to support the components. The outer shell 1 as a whole supports the refrigeration cycle structure 2, the oil filtration structure 3, and the control module. The control module regulates the entire process.

[0033] In some embodiments, the central cylinder 32 is provided with a plurality of evenly distributed oil leakage through holes; the outer circular surface of the cleaning collar 310 is provided with an annular limiting groove, wherein the arc-shaped limiting block 39 is adapted to the annular limiting groove, and the arc-shaped limiting block 39 is rotatably connected in the annular limiting groove.

[0034] In this embodiment, the filtered oil flows smoothly into the inner cavity of the central cylinder 32 through the evenly distributed oil leakage holes, preparing it for subsequent cooling in the high-precision heat exchanger 23. The annular limiting groove on the outer surface of the cleaning collar 310 is matched with the arc-shaped limiting block 39, and the arc-shaped limiting block 39 is rotatably connected within the annular limiting groove. This not only restricts the axial movement of the cleaning collar 310 but also does not hinder its synchronous rotation with the folded filter element 318, ensuring that the cleaning scraper 311 can always adhere to the filter element surface and stably scrape impurities, thus ensuring a smooth and efficient filtration process.

[0035] In some embodiments, an oil injection bend 312 is fixedly installed on the housing cover 33, penetrating the housing cover 33, the annular oil box 34, and the outer casing 1.

[0036] In this embodiment, the oil injection bend 312 is fixedly installed on the housing cover 33 and passes through the annular oil box 34 and the outer shell 1. During operation, it receives the circulating oil delivered by the equipment's matching oil pump and accurately guides the oil into the inner cavity of the annular oil box 34. Its function is to provide a sealed and directional delivery channel for the oil, preventing oil leakage, and ensuring that the oil can stably impact the drive blade 319 and flow into the hollow oil guide pipe 35, providing a pre-conditioning for the subsequent forced filtration process of the oil.

[0037] Please see Figures 3-5 and Figure 7A base plate 313 is fixedly installed at the bottom end of the central cylinder 32, and an oil inlet groove is provided on the base plate 313; a valve spring 314 is fixedly installed on the inner wall of the central cylinder 32 through a cross, and a bypass valve block 315 adapted to the oil inlet groove is fixedly installed on the valve spring 314; a top plate 316 is fixedly installed at the top end of the central cylinder 32.

[0038] The bottom plate 313 at the bottom of the central cylinder 32 and the top plate 316 at the top cooperate to limit and fix the pleated filter element 318 located between them, ensuring that the filter element rotates stably with the central cylinder 32. Under normal circumstances, the bypass valve block 315, which is pushed up by the valve spring 314, tightly seals the oil inlet groove on the bottom plate 313. When the pleated filter element 318 is accidentally blocked, causing the pressure inside the central cylinder 32 to rise abnormally, the pressure will compress the valve spring 314, causing the bypass valve block 315 to disengage from the oil inlet groove, and the oil will circulate by bypass through the oil inlet groove. The bottom plate 313 and the top plate 316 cooperate to ensure that the pleated filter element 318 is installed firmly, and at the same time, the bypass structure prevents the filter element from being blocked, which could cause system shutdown or a sudden increase in resistance, thus maintaining the continuity of oil circulation and the stability of equipment operation.

[0039] Please see Figures 5-9 A number of filter paper support frames 317 adapted to the central cylinder 32 are fixedly installed on the outside of the central cylinder 32. A pleated filter element 318 adapted to the filter paper support frame 317 is provided on the outside of the filter paper support frame 317. The pleated filter element 318 is located between the bottom plate 313 and the top plate 316. The cleaning scraper 311 is adapted to the pleated filter element 318 and contacts the pleated filter element 318.

[0040] The filter paper support frame 317 is fixedly installed on the outside of the central cylinder 32, and cooperates with the bottom plate 313 and the top plate 316 to limit and fix the folded filter element 318 located between the three. It rotates synchronously with the central cylinder 32. During the rotation, the folded filter element 318 receives the directionally sprayed oil and filters the impurities. The cleaning scraper 311, which is adapted to and in contact with the filter element, moves up and down with the telescopic oil drain pipe 37 to continuously scrape the contaminants attached to the surface of the filter element. Its function is that the filter paper support frame 317 provides internal support for the folded filter element 318 to prevent deformation by high-pressure spray. At the same time, it fixes the folded shape of the filter element without additional glue application. The folded filter element 318 achieves oil impurity interception, and the cleaning scraper 311 reduces the possibility of filter element clogging, together ensuring the uniformity and stability of filtration.

[0041] Please see Figure 3 The refrigeration cycle structure 2 includes a compressor 21 fixedly installed at the bottom of the inner cavity of the outer shell 1. The compressor 21 is fixedly connected to a condenser 22 through a conduit. The output end of the condenser 22 is connected to a high-precision heat exchanger 23 through a conduit. The refrigerant outlet end of the high-precision heat exchanger 23 is fixedly connected to the refrigerant inlet port on the compressor 21 through a conduit.

[0042] When the refrigeration cycle structure 2 is working, after the control module starts, the compressor 21 first compresses the refrigerant and delivers it to the condenser 22 through a conduit for condensation. The condensed refrigerant then enters the refrigerant channel of the high-precision heat exchanger 23 through a conduit, where it completes efficient heat exchange with the filtered oil flowing through it. The refrigerant after heat exchange then flows back to the refrigerant inlet port of the compressor 21 through a conduit, forming a closed-loop cycle. Its function is that the compressor 21 provides power for the refrigeration cycle, the condenser 22 realizes the condensation of the refrigerant, and the high-precision heat exchanger 23 quickly removes excess heat from the oil. The entire structure works in concert to achieve precise cooling of the oil (by adding a high-precision temperature sensor to detect the oil temperature), maintain the optimal operating temperature range of the oil, and ensure stable operation of the equipment.

[0043] Please see Figures 1-3 A rotary joint 4 is fixedly installed at the top of the central cylinder 32. The rotary joint 4 is fixedly connected to the oil inlet port of the high-precision heat exchanger 23 through a conduit. The oil outlet port of the high-precision heat exchanger 23 is fixedly connected to a normal temperature oil drain pipe 5 that penetrates the outer shell 1.

[0044] After the filtered oil enters the inner cavity of the central cylinder 32, it is precisely delivered to the oil inlet port of the high-precision heat exchanger 23 through the rotary joint 4 fixedly installed at its top, ensuring that the central cylinder 32 is sealed and leak-proof during rotation. After the oil is cooled in the high-precision heat exchanger 23, it flows from its oil outlet port into the ambient temperature oil drain pipe 5 fixedly connected to it, and finally flows back into the equipment through the outer shell 1. Its function is that the rotary joint 4 achieves a sealed connection between the rotating parts and the fixed drain pipe to prevent oil leakage, the high-precision heat exchanger 23 completes the heat exchange between the oil and the refrigerant to achieve precise cooling, and the ambient temperature oil drain pipe 5 provides a directional output channel for the cooled oil. The three work together to ensure a smooth closed loop of the "filtration-cooling-circulation" process.

[0045] In practical use, the working principle of this invention is as follows:

[0046] When using this high-precision oil cooler, the internal circulating oil is first extracted by the oil pump that is matched with the equipment, and the oil discharge end of the oil pump is fixedly connected to the oil injection bend 312. The active delivery of oil is achieved by using the forced power provided by the oil pump. After the oil is precisely introduced into the inner cavity of the annular oil box 34 through the oil injection bend 312, it will impact the drive blade 319 fixedly installed on the central cylinder 32. The drive blade 319 will be driven to rotate by hydraulic pressure, which will in turn drive the central cylinder 32 connected to the drive blade 319 to rotate synchronously. The folded filter element 318 fixed on the outside of the central cylinder 32 by the filter paper support frame 317 will also rotate together, laying the foundation for the oil to evenly cover the filter element. On the other hand, the oil entering the annular oil box 34 will continuously flow into the hollow oil guide pipe 35 at the bottom. As the oil continues to accumulate, the pressure in the hollow oil guide pipe 35 will gradually increase. This pressure will overcome the elastic tension of the telescopic spring 36 and cause it to stretch, thereby pushing the telescopic drain pipe 37 fixedly connected to the lower end of the telescopic spring 36 to slide downward along the inner wall of the hollow oil guide pipe 35. Since the total oil output of the oil drain hole 38 opened on the telescopic oil drain pipe 37 is less than the oil inlet of the hollow oil guide pipe 35, it can ensure that the pressure inside the pipe is sufficient to push the telescopic oil drain pipe 37 to extend stably. Moreover, the oil drain hole 38 after extension faces the pleated filter element 318, so that the oil acts on the surface of the rotating pleated filter element 318 in a directional spray manner.

[0047] Under the dual action of rotation of the pleated filter element 318 and directional oil injection, the oil is forced and evenly covered on the entire outer surface of the pleated filter element 318, avoiding the problem of uneven impurity adhesion caused by local oil concentration in traditional methods, and effectively reducing the risk of early local clogging of the filter element. At the same time, to prevent the pleated filter element 318 from deforming due to high-pressure oil injection, the filter paper support frame 317 provides stable internal support for the filter element, while the cleaning collar 310 is rotatably connected to the telescopic oil drain pipe 37 through the arc-shaped limiting block 39. The cleaning scraper 311 on its inner side is in close contact with the surface of the pleated filter element 318, which can not only limit and fix the pleated structure of the pleated filter element 318, ensuring that each pleat maintains a regular shape without the need for additional fixation by means of glue, but also maintain the effective filtration area of ​​the filter element.

[0048] During the oil filtration process, the oil pump's delivery rate is intermittently adjusted, causing the oil pressure within the hollow oil guide tube 35 to change periodically: when the pressure increases, the telescopic drain pipe 37 extends downwards; when the pressure decreases, the telescopic spring 36, under the action of elastic restoring force, pulls the telescopic drain pipe 37 upwards, thereby driving the cleaning collar 310 and the cleaning scraper 311 (which can be made of soft rubber material) to reciprocate up and down along the surface of the pleated filter element 318. Since the cleaning scraper 311 is always in contact with the filter element surface, it continuously scrapes away metal shavings, dust particles, and sludge adhering to the filter element surface during the reciprocating motion, promptly cleaning contaminants from the filter material surface. This prevents impurity accumulation that leads to decreased filtration efficiency and increased flow resistance, significantly improving the stability and service life of the filtration system.

[0049] After being filtered and purified by the pleated filter element 318, the oil enters the inner cavity of the central cylinder 32 through several evenly distributed oil leakage holes (a small pump can be added inside the central cylinder 32 to assist in oil discharge if further improvement in oil discharge efficiency is required). Then, it is precisely guided through a conduit to the oil inlet port of the high-precision heat exchanger 23 via a rotary joint 4 fixedly connected to the top of the central cylinder 32. Simultaneously, the control module activates the refrigeration cycle structure 2: the compressor 21 compresses the refrigerant and delivers it to the condenser 22 for condensation. The condensed refrigerant enters the refrigerant channel of the high-precision heat exchanger 23, where it undergoes efficient heat exchange with the oil flowing through the heat exchanger, quickly removing excess heat generated during equipment operation and achieving precise cooling of the oil. Finally, the oil, cooled to its optimal operating temperature range, flows through the oil outlet port of the high-precision heat exchanger 23 into the ambient temperature oil drain pipe 5, and is discharged back into the equipment, completing the entire "filtration-cooling-circulation" process. In addition, when the pleated filter element 318 becomes accidentally clogged, causing the pressure inside the central cylinder 32 to rise abnormally, the valve spring 314 fixed to the inner wall of the central cylinder 32 by the cross will be compressed, causing the bypass valve block 315 to disengage from the oil inlet groove on the bottom plate 313, so that the oil can circulate normally through the bypass channel.

[0050] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A high-precision oil cooler, characterized in that, It includes a housing (1) and a control module fixedly installed on the housing (1). The housing (1) is provided with a refrigeration cycle structure (2) and an oil filter structure (3). The oil filtration structure (3) includes a filter housing (31) fixedly installed on the inner wall of the outer shell (1) by a fixing buckle. The inner cavity of the filter housing (31) is provided with a central cylinder (32). The top end of the central cylinder (32) is rotatably sealed with a housing cover (33), and the housing cover (33) is threadedly connected to the outer shell (1). The bottom of the housing cover (33) is fixedly installed with an annular oil box (34) adapted to the central cylinder (32). Several driving blades (319) located in the inner cavity of the annular oil box (34) are fixedly installed on the central cylinder (32). The bottom of the annular oil box (34) is fixedly installed with a hollow oil guide pipe (35) communicating with the inner cavity of the annular oil box (34). (35) has a telescopic spring (36) fixedly installed on its inner wall by a cross. The lower end of the telescopic spring (36) is fixedly connected to a telescopic drain pipe (37) that is compatible with the hollow oil guide pipe (35). The lower end of the telescopic spring (36) is fixedly installed on the top end of the telescopic drain pipe (37). The telescopic drain pipe (37) is slidably connected to the hollow oil guide pipe (35). The telescopic drain pipe (37) has several drain holes (38). Several arc-shaped limiting blocks (39) are fixedly installed on the telescopic drain pipe (37). A cleaning collar (310) is rotatably connected to the arc-shaped limiting block (39). Several equally spaced cleaning scrapers (311) are fixedly installed on the inner circular surface of the cleaning collar (310). A plurality of filter paper support frames (317) adapted to the central cylinder (32) are fixedly installed on the outside of the central cylinder (32). A pleated filter element (318) adapted to the filter paper support frame (317) is provided on the outside of the filter paper support frame (317). The cleaning scraper (311) is adapted to the pleated filter element (318) and the cleaning scraper (311) contacts the pleated filter element (318).

2. The high-precision oil cooler according to claim 1, characterized in that: The central cylinder (32) has several evenly distributed oil leakage holes; the outer surface of the cleaning collar (310) has an annular limiting groove, wherein the arc-shaped limiting block (39) is adapted to the annular limiting groove, and the arc-shaped limiting block (39) is rotatably connected in the annular limiting groove.

3. A high-precision oil cooler according to claim 1, characterized in that: An oil injection bend (312) is fixedly installed on the housing cover (33), the annular oil box (34) and the outer shell (1).

4. A high-precision oil cooler according to claim 1, characterized in that: A base plate (313) is fixedly installed at the bottom end of the central cylinder (32), and an oil inlet groove is provided on the base plate (313); a valve spring (314) is fixedly installed on the inner wall of the central cylinder (32) by a cross, and a bypass valve block (315) adapted to the oil inlet groove is fixedly installed on the valve spring (314); a top plate (316) is fixedly installed at the top end of the central cylinder (32), and a pleated filter element (318) is located between the base plate (313) and the top plate (316).

5. A high-precision oil cooler according to claim 1, characterized in that: The refrigeration cycle structure (2) includes a compressor (21) fixedly installed at the bottom of the inner cavity of the outer shell (1). The compressor (21) is fixedly connected to a condenser (22) through a conduit. The output end of the condenser (22) is connected to a high-precision heat exchanger (23) through a conduit. The refrigerant outlet end of the high-precision heat exchanger (23) is fixedly connected to the refrigerant inlet port on the compressor (21) through a conduit.

6. A high-precision oil cooler according to claim 1, characterized in that: A rotary joint (4) is fixedly installed at the top of the central cylinder (32). The rotary joint (4) is fixedly connected to the oil inlet port of the high-precision heat exchanger (23) through a conduit. The oil outlet port of the high-precision heat exchanger (23) is fixedly connected to a normal temperature oil drain pipe (5) that penetrates the outer shell (1).

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