High-efficiency oil mist separating device for heat pump rectification

Abstract

The application discloses a kind of high-efficiency oil mist separation devices for heat pump rectification, it is related to oil mist separation and recovery technical field, including oil mist separation tank and self-cleaning component, and the top of oil mist separation tank is fixedly installed with self-cleaning component.The application uses process, when fan stops due to failure, one-way pressure valve in safety pipeline is opened after reaching pressure threshold in air inlet cavity, and the oil mist in air inlet cavity enters the bottom side end of filter cartridge instead, and the staggered distribution of half cone in the inner wall of filter cartridge forms zigzag labyrinth channel, increases the flow resistance of oil mist, at the same time, when oil mist flows in labyrinth channel, it will constantly collide with the lower surface of half cone, thereby adsorbing small oil in gas on the lower surface of half cone, and under the action of gravity, it is returned to the return main pipe connected to the bottom of oil mist separation tank through return branch pipe, thereby realizing the separation and recovery of oil droplets in oil mist, and the applicability is stronger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil mist separation and recovery, in particular to a high-efficiency oil mist separation device for heat pump rectification. BACKGROUND

[0002] With the rapid development of domestic heat pump rectification process, heat pump compressors are also used more and more frequently. Heat pump compressors are key core equipment in rectification systems, and the reliability, safety and low failure rate of compressors are required to be very high. Heat pump compressors generally use sliding bearings, and the bearings are forcedly lubricated by a thin oil station. However, the temperature of the oil return in the thin oil station is relatively high, so the pressure and temperature in the oil tank are higher than those of the atmosphere. Therefore, the oil tank releases heat and pressure to the outside. If the heat and pressure are not drained and treated, the oil seal of the speed increasing box will leak oil, and a large amount of oil mist and oil droplets will exist on the compressor equipment. The oil mist separation device is installed on CNC machining centers, cleaning machines, die casting machines, CNC lathes and other machining equipment to absorb the oil mist in the machining cavity or oil tank, purify the air and protect the health of workers.

[0003] Although the ordinary oil mist treatment device can separate oil mist, the separation efficiency is only 90%, and when the fan fails, the oil mist cannot pass through the filter element due to the relatively large resistance of the filter element, and is often directly discharged into the air, polluting the surrounding environment, causing health hazards to operators, affecting the safe operation of equipment, and bringing operation risks to enterprises. In addition, the separation filter element in the prior art is easily clogged by impurities wrapped in oil droplets in the long-term use process, and the prior art lacks a corresponding self-cleaning structure, thereby causing the filtration effect of the separation filter element to gradually decrease in long-term use.

[0004] Therefore, in view of the above problems, the present application improves the existing structure and provides a high-efficiency oil mist separation device for heat pump rectification. SUMMARY

[0005] The present application aims to provide a high-efficiency oil mist separation device for heat pump rectification to solve the problems in the background art.

[0006] In order to achieve the above object, the present application provides the following technical scheme: An efficient oil mist separation device for heat pump rectification, comprising an oil mist separation tank and a self-cleaning assembly, the top end of the oil mist separation tank is fixedly installed with the self-cleaning assembly, the self-cleaning assembly comprises an end cover, a fan shell, a partition, a side flow channel, a bearing seat, an impeller, a motor, a magnetic coil and a controller, the end cover is bolted to the top end of the oil mist separation tank, and the fan shell is bolted to the top of the end cover, the partition of annular structure is fixedly installed in the inside of the fan shell, and the side flow channel is arranged on the outside of the partition, the bearing seat is fixedly installed on the inside end of the partition, and the impeller is rotatably installed in the inside of the bearing seat, the impeller is fixedly connected to the output end of the motor, the magnetic coil is arranged in the inside recess gap of the impeller, the controller is connected to the outside of the magnetic coil, the hole diameter of the magnetic coil is larger than the diameter of the output shaft of the motor, and the end of the magnetic coil is fixedly connected to the fan shell.

[0007] Further, the inside bottom end of the oil mist separation tank is fixedly installed with a partition, and the bottom of the partition is provided with an air inlet cavity, the bottom end of the oil mist separation tank is fixedly installed with a reflux main pipe communicated with the air inlet cavity, the end of the reflux main pipe is fixedly connected to an oil tank through a connecting flange, and the connecting flange is internally provided with a foreign matter filter screen.

[0008] Further, the top of the through hole in the middle of the partition is fixedly installed with a coalescing filter element, and the inside cavity of the coalescing filter element is communicated with the air inlet cavity below the partition.

[0009] Further, the coalescing filter element is rotatably installed with a rotating disc through a sealing bearing at the open top end, the bottom of the rotating disc is coaxially connected with an inner wall scraper, and the inner wall scraper is tightly attached to the inner wall of the coalescing filter element.

[0010] Further, the top disc surface of the rotating disc is fixedly connected with a sheet spring, one end of the sheet spring away from the rotating disc is elastically connected with a floating disc, and the floating disc is frictionally driven with the impeller under the magnetic attraction of the magnetic coil after the magnetic coil is energized.

[0011] Further, a first-stage filter cavity is arranged in the outside gap between the coalescing filter element and the oil mist separation tank, and the side wall of the first-stage filter cavity is communicated with the air inlet end of the side flow channel through an air suction pipe.

[0012] Further, a cyclone separator is fixedly installed on the side of the end cover, a spiral inlet pipe is fixedly installed at the top of the cone body of the cyclone separator, and the spiral inlet pipe is communicated with the air outlet end of the side flow channel through an air exhaust pipe.

[0013] Further, a secondary filter cavity is arranged in the inside of the cone body of the cyclone separator, an overflow pipe is vertically communicated with the middle end of the cavity of the secondary filter cavity, and the overflow pipe is externally connected with a bent air outlet.

[0014] Further, the cyclone separator bottom is communicated with a pressure relief protection assembly, the pressure relief protection assembly comprises a filter cartridge, an intercepting filter screen and a half cone, the filter cartridge is communicated with the bottom end of the secondary filtering cavity in the cyclone separator through the intercepting filter screen, and half cones with concave upper sides are staggered distributed on the inner walls of the two sides of the filter cartridge.

[0015] Further, the pressure relief protection assembly further comprises a safety pipeline and a backflow branch pipe, the safety pipeline at the bottom side end of the filter cartridge is communicated with the side end of the air inlet cavity through a one-way pressure valve, and the backflow branch pipe at the middle end of the filter cartridge bottom is communicated with the side wall of the backflow main pipe through a stop valve.

[0016] The application provides a high-efficiency oil mist separation device for heat pump rectification.

[0017] 1、in the use process of the application, when the fan stops due to failure, the one-way pressure valve built in the safety pipeline is opened after the pressure threshold in the air inlet cavity is reached, and the oil mist in the air inlet cavity enters the bottom side end of the filter cartridge through the safety pipeline, the half cones with concave upper sides staggered distributed on the inner walls of the two sides of the filter cartridge form a zigzag labyrinth channel, the oil mist flow resistance is increased, and when the oil mist flows in the labyrinth channel, the oil mist continuously collides with the lower surface of the half cone, so that the small oil in the gas is adsorbed on the lower surface of the half cone, and under the action of gravity, the oil mist is backflowed to the backflow main pipe communicated with the bottom of the oil mist separation tank through the backflow branch pipe, so that the oil droplets in the oil mist are separated and recovered;

[0018] 2、in the use process of the application, in the normal use process, the oil mist passes through the coalescing filter element from inside to outside, most of the oil droplets in the oil mist are intercepted and retained on the inside of the coalescing filter element, and under the action of gravity, the oil mist is backflowed to the oil tank through the backflow main pipe, and the oil mist separated once is sucked into the side flow channel outside the fan shell, is tangentially introduced into the top spiral inlet pipe of the cyclone separator through the exhaust pipe communicated with the air outlet end of the side flow channel, and the gas and oil droplets in the oil mist are further separated by using the rotating airflow principle, the two filtering processes composed of the interception and filtration of the coalescing filter element and the cyclone separation of the cyclone separator further improve the separation effect of the oil mist on the basis of the prior art, and the applicability is stronger.

[0019] 3、The application uses a differential pressure sensor to sense the pressure difference between the inside and outside of the coalescing filter core, when the coalescing filter core is blocked by impurities affecting the filtering effect, the controller supplies power to the magnetic coil to generate magnetism, the magnetic coil further magnetically attracts the floating disc to make the floating disc overcome the elastic force of the sheet-shaped spring and frictionally drive the impeller, the floating disc further rotates the rotating disc located at the opening at the top end of the coalescing filter core through the sheet-shaped spring, so that the rotating disc drives the coaxial inner wall scraper at the bottom to scrape and clean the inner wall of the coalescing filter core, the above self-cleaning process does not need to stop the oil mist separation tank, that is, the self-cleaning operation can be synchronized with the oil mist separation operation and does not interfere with each other, through the self-cleaning operation of the filter surface inside the coalescing filter core, the continuous service life of the coalescing filter core is prolonged, and the oil mist separation effect of the coalescing filter core is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall external state of the device of the application;

[0021] Figure 2 It is a schematic diagram of the overall internal state of the device of the application;

[0022] Figure 3 It is a schematic diagram of the overall cross-sectional structure of the device of the application;

[0023] Figure 4 It is a schematic diagram of the structure of the self-cleaning assembly of the application;

[0024] Figure 5 It is a schematic diagram of part of the structure of the device of the application;

[0025] Figure 6 It is a schematic diagram of the cross-sectional structure of the cyclone separator of the application;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the pressure relief protection assembly of the application.

[0027] In the figure: 1, oil mist separation tank; 2, self-cleaning assembly; 201, end cover; 202, fan housing; 203, partition; 204, side flow channel; 205, bearing seat; 206, impeller; 207, motor; 208, magnetic coil; 209, controller; 3, partition; 4, air inlet cavity; 5, backflow main pipe; 6, connecting flange; 7, impurity filter screen; 8, coalescing filter core; 9, rotating disc; 10, inner wall scraper; 11, sheet-shaped spring; 12, floating disc; 13, primary filter cavity; 14, air suction pipe; 15, cyclone separator; 16, spiral inlet pipe; 17, exhaust pipe; 18, secondary filter cavity; 19, overflow pipe; 20, bent air outlet; 21, pressure relief protection assembly; 2101, filter cartridge; 2102, interception filter screen; 2103, half-cone hopper; 2104, safety pipeline; 2105, backflow branch pipe. DETAILED DESCRIPTION

[0028] The embodiments of the present application will be further described in details below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application

[0029] Please refer to Figures 1 to 5 The present application provides a technical solution: a high-efficiency oil mist separation device for heat pump rectification, comprising an oil mist separation tank 1 and a self-cleaning assembly 2, the top end of the oil mist separation tank 1 is fixedly installed with the self-cleaning assembly 2, the self-cleaning assembly 2 comprises an end cover 201, a fan shell 202, a partition 203, a side flow channel 204, a bearing seat 205, an impeller 206, a motor 207, a magnetic coil 208 and a controller 209, the end cover 201 is bolted to the top end of the oil mist separation tank 1, and the fan shell 202 is bolted to the top middle end of the end cover 201, the partition 203 of annular structure is fixedly installed inside the fan shell 202, and the side flow channel 204 is arranged outside the partition 203, the bearing seat 205 is fixedly installed at the inner side end of the partition 203, and the impeller 206 is rotatably installed inside the bearing seat 205, the impeller 206 is fixedly connected to the output end of the motor 207, the magnetic coil 208 is arranged in the inner side notch gap of the impeller 206, the controller 209 is connected to the magnetic coil 208, and the hole diameter of the magnetic coil 208 is greater than the diameter of the output shaft of the motor 207, and the end of the magnetic coil 208 is fixed to the fan shell 202;

[0030] The specific operation is as follows: the oil mist in the oil tank enters the air inlet cavity 4 below the partition 3, due to the relatively large resistance of the coalescing filter element 8, the oil mist cannot pass through the coalescing filter element 8, and the continuous increase of the oil mist will cause the pressure in the air inlet cavity 4 to increase, when the threshold value is reached, the one-way pressure valve built in the safety pipeline 2104 is opened, and the oil mist in the air inlet cavity 4 enters the bottom side end of the filter cartridge 2101 through the safety pipeline 2104, the staggered distribution of the half-cone buckets 2103 on the inner walls of the two sides of the filter cartridge 2101 forms a zigzag-shaped labyrinth channel, which increases the flow resistance of the oil mist, and at the same time, when the oil mist flows in the labyrinth channel, it will continuously collide with the lower surface of the half-cone bucket 2103, thereby adsorbing the fine oil in the gas on the lower surface of the half-cone bucket 2103, and under the action of gravity, it flows back to the backflow main pipe 5 connected to the bottom of the oil mist separation tank 1 through the backflow branch pipe 2105, thereby realizing the separation and recovery of the oil droplets in the oil mist, and the gas separated from the oil mist passes through the interception filter screen 2102 and enters the secondary filtering cavity 18 inside the cyclone separator 15, and is further discharged to the external environment through the bent air outlet 20 connected to the top of the overflow pipe 19, thereby effectively solving the problem of environmental pollution caused by direct discharge of oil mist when the fan fails to stop in the prior art;

[0031] Please refer to Figures 3 to 5The oil mist separation tank 1 is internally fixed with a partition plate 3 at the bottom end, and an air inlet cavity 4 is arranged below the partition plate 3. The oil mist separation tank 1 is fixed with a return main pipe 5 at the bottom end, which is in communication with the air inlet cavity 4. The end of the return main pipe 5 is fixed with the oil tank through a connecting flange 6, and the connecting flange 6 is internally provided with an impurity filter screen 7. The top of the middle through hole of the partition plate 3 is fixedly installed with a coalescence filter element 8, and the internal cavity of the coalescence filter element 8 is in communication with the air inlet cavity 4 below the partition plate 3. The open top end of the coalescence filter element 8 is rotatably installed with a rotating disc 9 through a sealing bearing, and the bottom of the rotating disc 9 is coaxially connected with an inner wall scraper 10, which is tightly attached to the inner wall of the coalescence filter element 8. The top disc surface of the rotating disc 9 is fixedly connected with a sheet spring 11, and the end of the sheet spring 11 away from the rotating disc 9 is elastically connected with a floating disc 12. The floating disc 12 is frictionally driven with an impeller 206 under the magnetic attraction of a magnetic coil 208 after being energized. An outer gap between the coalescence filter element 8 and the oil mist separation tank 1 is provided with a first filtering cavity 13, and the side wall of the first filtering cavity 13 is in communication with the air inlet end of a side flow channel 204 through an air suction pipe 14.

[0032] Specific operation is as follows. The motor 207 drives the impeller 206 to rotate, so that the air inlet end of the side flow channel 204 sucks the gas in the first filtering cavity 13 through the air suction pipe 14 and generates negative pressure in the oil mist separation tank 1. The oil mist in the oil tank is sucked into the air inlet cavity 4 below the partition plate 3 under the negative pressure attraction, and further enters the internal cavity of the coalescence filter element 8 through the middle through hole of the partition plate 3. The oil mist passes through the coalescence filter element 8 from inside to outside. Most of the oil droplets in the oil mist are intercepted and retained on the inner side of the coalescence filter element 8, and are returned to the oil tank through the return main pipe 5 under the action of gravity. The impurity filter screen 7 arranged in the connecting flange 6 at the end of the return main pipe 5 is used for filtering the oil liquid returned to the oil tank. The oil mist separated once is sucked into the side flow channel 204 outside the fan housing 202, and is tangentially introduced into the top spiral inlet pipe 16 of the cyclone separator 15 through the exhaust pipe 17 in communication with the air outlet end of the side flow channel 204. The gas and oil droplets in the oil mist are further separated by using the principle of rotating airflow. The separated gas in the oil mist is discharged through the bent air outlet 20 at the top end of the overflow pipe 19, and the oil droplets separated twice are attached to the inner wall of the cone of the secondary filtering cavity 18, and are introduced into the filter cartridge 2101 at the bottom of the cyclone separator 15 under the action of gravity. The half-cone buckets 2103 in the filter cartridge 2101 are staggered in up and down directions, and the concave part faces upward, so as not to affect the gravity flow of the oil droplets. The oil droplets are collected through the return branch pipe 2105 and are returned to the oil tank through the return main pipe 5 at the bottom of the oil mist separation tank 1. The two filtering processes composed of the interception and filtration of the coalescence filter element 8 and the cyclone separation of the cyclone separator 15 further improve the separation effect of the oil mist on the basis of the prior art, and have stronger applicability.

[0033] Please refer to Figures 6 to 7The side surface of the end cover 201 is fixedly provided with a cyclone separator 15, the top end of the cone of the cyclone separator 15 is fixedly provided with a spiral inlet pipe 16, the spiral inlet pipe 16 is connected with the gas outlet end of the side flow channel 204 through an exhaust pipe 17, the inside of the cone of the cyclone separator 15 is provided with a secondary filtering cavity 18, the middle end of the cavity of the secondary filtering cavity 18 is vertically connected with an overflow pipe 19, the overflow pipe 19 is externally connected with a bent gas outlet 20, the bottom of the cyclone separator 15 is connected with a pressure relief protection assembly 21, the pressure relief protection assembly 21 comprises a filter cartridge 2101, an intercepting filter screen 2102 and a half-cone 2103, the filter cartridge 2101 is connected with the bottom end of the secondary filtering cavity 18 in the cyclone separator 15 through the intercepting filter screen 2102, the inside walls of the two sides of the filter cartridge 2101 are staggered and distributed with the half-cones 2103 with notches facing upwards, the pressure relief protection assembly 21 further comprises a safety pipe 2104 and a backflow branch pipe 2105, the safety pipe 2104 at the side end of the bottom of the filter cartridge 2101 is connected with the side end of the air inlet cavity 4 through a one-way pressure valve, and the backflow branch pipe 2105 at the middle end of the bottom of the filter cartridge 2101 is connected with the side wall of the backflow main pipe 5 through a stop valve;

[0034] Specific operation is as follows, in the long-term use process, the impurities wrapped in the oil mist will cause the filter channel of the coalescing filter element 8 to be blocked, the differential pressure sensor is used to sense the pressure difference between the inside and outside of the coalescing filter element 8, when the coalescing filter element 8 is affected by the impurities to block the filter effect, the controller 209 supplies power to the magnetic coil 208 to generate magnetism, the magnetic coil 208 further magnetically attracts the floating disc 12 to make the floating disc 12 overcome the elastic force of the sheet-shaped spring 11 to frictionally drive the impeller 206, the floating disc 12 further rotates the rotating disc 9 located at the top opening of the coalescing filter element 8 through the sheet-shaped spring 11 to rotate and drive, so that the rotating disc 9 drives the bottom coaxial inner wall scraper 10 to scrape and clean the inner wall of the coalescing filter element 8, the above-mentioned self-cleaning process does not need to stop the oil mist separation tank 1, that is, the self-cleaning operation can be synchronized with the oil mist separation operation and does not interfere with each other, through the self-cleaning operation of the inside filter surface of the coalescing filter element 8, the continuous use life of the coalescing filter element 8 is prolonged, and the oil mist separation effect of the coalescing filter element 8 is guaranteed.

[0035] It is worth mentioning that the material of the coalescing filter element 8 used in the application is glass fiber or polyester fiber after surface treatment, through the special designed structure, the airflow forms a tortuous channel, forces the liquid droplets to be captured by the superfine fiber under the action of three filtering mechanisms of inertial collision, diffusion interception and direct interception, the liquid surface tension makes the small droplets coalesce into large droplets, due to the action of gravity, the large droplets settle at the bottom of the coalescing filter element 8, so that the filtering effect is realized.

[0036] In summary, in the use of the high-efficiency oil mist separation device for heat pump rectification, during normal use, the motor 207 drives the impeller 206 to rotate, so that the gas in the first-stage filter cavity 13 is sucked into the oil mist separation tank 1 through the suction pipe 14, and a negative pressure is generated inside the oil mist separation tank 1. The oil mist in the oil tank is sucked into the air inlet cavity 4 below the partition plate 3 through the return manifold 5 under the negative pressure, and further enters the inside of the coalescing filter element 8 through the through hole in the middle of the partition plate 3. The oil mist passes through the coalescing filter element 8 from inside to outside, most of the oil droplets in the oil mist are intercepted and retained on the inside of the coalescing filter element 8, and under the action of gravity, the oil mist returns to the oil tank through the return manifold 5. The impurity filter screen 7 arranged in the flange 6 at the end of the return manifold 5 is used to filter the oil liquid returned to the oil tank, and the oil mist separated once is sucked into the side flow channel 204 outside the fan housing 202, and further introduced into the top spiral inlet pipe 16 of the cyclone separator 15 through the exhaust pipe 17 connected to the gas outlet end of the side flow channel 204. The gas and oil droplets in the oil mist are further separated by using the principle of rotating airflow, the separated gas in the oil mist is discharged through the bent gas outlet 20 connected to the top end of the overflow pipe 19, and the oil droplets separated twice adhere to the inner wall of the cone of the secondary filter cavity 18, and under the action of gravity, enter the filter cartridge 2101 connected to the bottom of the cyclone separator 15. The half-cone buckets 2103 arranged in the filter cartridge 2101 do not affect the gravity flow of the oil droplets because the notches are upward, and the oil droplets are collected in the return manifold 5 connected to the bottom of the oil mist separation tank 1 through the return branch pipe 2105, and are returned to the oil tank. The present application further improves the separation effect of the oil mist by the two filtering processes composed of the interception and filtration of the coalescing filter element 8 and the cyclone separation of the cyclone separator 15, and has stronger applicability. When the fan stops due to failure, the oil mist entering the air inlet cavity 4 below the partition plate 3 cannot pass through the coalescing filter element 8 because of the relatively large resistance of the coalescing filter element 8. The continuous increase of the oil mist will cause the pressure in the air inlet cavity 4 to increase, and when the pressure reaches a threshold value, the one-way pressure valve arranged in the safety pipeline 2104 is opened, and the oil mist in the air inlet cavity 4 enters the bottom side end of the filter cartridge 2101 through the safety pipeline 2104. The half-cone buckets 2103 arranged on the inner walls of the filter cartridge 2101 form a zigzag-shaped labyrinth channel, which increases the flow resistance of the oil mist, and when the oil mist flows in the labyrinth channel, it will continuously collide with the lower surfaces of the half-cone buckets 2103, thereby adsorbing the small oil droplets in the gas on the lower surfaces of the half-cone buckets 2103, and under the action of gravity, the oil droplets are returned to the return manifold 5 connected to the bottom of the oil mist separation tank 1 through the return branch pipe 2105, thereby realizing the separation and recovery of the oil droplets in the oil mist. The separated gas in the oil mist enters the secondary filter cavity 18 in the cyclone separator 15 through the interception filter screen 2102, and the separated gas in the oil mist is discharged to the external environment through the bent gas outlet 20 connected to the top of the overflow pipe 19, thereby effectively solving the problem of environmental pollution caused by the direct discharge of oil mist when the fan fails in the prior art.The impurities entrapped in the oil mist can cause the filter channel of the coalescing filter element 8 to be blocked, the differential pressure sensor is used to sense the pressure difference between the inside and outside of the coalescing filter element 8, when the coalescing filter element 8 is blocked by impurities and the filtering effect is affected, the controller 209 is powered to the magnetic coil 208 to generate magnetism, the magnetic coil 208 further magnetically attracts the floating disc 12 to make the floating disc 12 overcome the elastic force of the sheet-shaped spring 11 and frictionally drive the impeller 206, the floating disc 12 further rotates the rotary disc 9 located at the top opening of the coalescing filter element 8 through the sheet-shaped spring 11, so that the rotary disc 9 drives the bottom coaxial inner wall scraper 10 to scrape and clean the inner wall of the coalescing filter element 8, the above-mentioned self-cleaning process does not need to stop the oil mist separation tank 1, that is, the self-cleaning operation can be synchronized with the oil mist separation operation and does not interfere with each other, through the self-cleaning operation of the inner side filter surface of the coalescing filter element 8, the continuous service life of the coalescing filter element 8 is prolonged, and the oil mist separation effect of the coalescing filter element 8 is ensured.

[0037] Embodiments of the application are presented for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the precise forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments were chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A high-efficiency oil mist separating device for heat pump rectification, characterized by comprising: The utility model provides an oil mist separation tank (1) and self -cleaning subassembly (2), oil mist separation tank (1) top fixed installation has self -cleaning subassembly (2), self -cleaning subassembly (2) including end cover (201), fan housing (202), partition (203), side flow channel (204), bearing seat (205), impeller (206), motor (207), magnetic coil (208) and controller (209), end cover (201) bolted on oil mist separation tank (1) top, and end cover (201) top middle end bolted with fan housing (202), the inside middle end of fan housing (202) is fixed with the partition (203) of annular structure, and the outside of partition (203) is equipped with side flow channel (204), the inside end of partition (203) is fixed with bearing seat (205), and bearing seat (205) inside rotation is installed with impeller (206), impeller (206) is fixedly connected to motor (207) output, and the inside recess gap of impeller (206) is equipped with magnetic coil (208), magnetic coil (208) is connected with controller (209), and the middle through -hole aperture of magnetic coil (208) is greater than the diameter of motor (207) output shaft, and the end of magnetic coil (208) is fixed with fan housing (202), the inside bottom of oil mist separation tank (1) is fixed with the baffle (3), and the air inlet cavity (4) is arranged below the baffle (3), the bottom of oil mist separation tank (1) is fixed with the return main pipe (5) communicated with the air inlet cavity (4), and the return main pipe (5) end is fixed with the oil tank through the connecting flange (6), and the connecting flange (6) is built in the impurity filter screen (7), the side of end cover (201) is fixedly installed with cyclone separator (15), and the top of cyclone separator (15) cone is fixed with spiral inlet pipe (16), and spiral inlet pipe (16) is communicated with the air outlet end of side flow channel (204) through the exhaust pipe (17), the bottom of cyclone separator (15) is communicated with pressure relief protection assembly (21), the pressure relief protection assembly (21) includes filter cartridge (2101), intercepting filter screen (2102) and half cone (2103), the filter cartridge (2101) is communicated with the bottom of secondary filtering cavity (18) in cyclone separator (15) through intercepting filter screen (2102), and the inside wall of filter cartridge (2101) both sides is staggered distribution has the half cone (2103) of recess upwards, the pressure relief protection assembly (21) still includes safety pipeline (2104) and return branch pipe (2105), the safety pipeline (2104) of filter cartridge (2101) bottom side end is communicated with the side end of air inlet cavity (4) through one-way pressure valve, and the return branch pipe (2105) of filter cartridge (2101) bottom middle end is communicated with the side wall of return main pipe (5) through stop valve.

2. The high-efficiency oil mist separator for heat pump rectification according to claim 1, characterized by The top of the middle through -hole of baffle (3) is fixedly installed with coalescing filter element (8), and the internal cavity of coalescing filter element (8) is communicated with the air inlet cavity (4) below baffle (3).

3. The high-efficiency oil mist separator for heat pump rectification according to claim 2, characterized in that, The coalescing filter element (8) is rotatably installed with a rotary disc (9) through a sealing bearing at the open top end, and the bottom of the rotary disc (9) is coaxially connected with an inner wall scraper (10), and the inner wall scraper (10) is closely attached to the inner wall of the coalescing filter element (8).

4. The high-efficiency oil mist separator for heat pump rectification according to claim 3, characterized by The top disc surface of the rotary disc (9) is fixedly connected with a sheet spring (11), one end of the sheet spring (11) away from the rotary disc (9) is elastically connected with a floating disc (12), and the floating disc (12) is frictionally driven with an impeller (206) under the magnetic attraction of the magnetic coil (208) after being energized.

5. The high-efficiency oil mist separator for heat pump rectification according to claim 4, characterized in that, An outer gap between the coalescing filter element (8) and the oil mist separation tank (1) is provided with a primary filtering cavity (13), and the sidewall of the primary filtering cavity (13) is connected in communication with the air inlet end of the side flow channel (204) through an air suction pipe (14).

6. The high-efficiency oil mist separator for heat pump rectification according to claim 1, characterized by The inside of the conical body of the cyclone separator (15) is provided with a secondary filtering cavity (18), the middle end of the cavity of the secondary filtering cavity (18) is vertically connected in communication with an overflow pipe (19), and the overflow pipe (19) is connected with a bent air outlet (20).

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