An oil mist purification device

Abstract

The present invention relates to the field of purification technology, and discloses an oil mist purification device. The oil mist purification device includes a housing, a centrifugal impeller and a filter assembly disposed in the housing. An air inlet and an air outlet are provided on the housing, and the air inlet is communicated with the air outlet. The centrifugal impeller is disposed in the housing and is arranged facing the air inlet. The filter assembly is disposed in the housing, and the oil mist waste gas flows through the filter assembly to the air outlet. The filter assembly includes a packing layer, and the packing layer is spaced around the outer periphery of the centrifugal impeller. This oil mist purification device can improve the oil mist removal effect and reduce the filtration resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of purification, and particularly relates to an oil mist purification device. Background Art

[0002] In modern manufacturing, metal cutting fluids are widely used to effectively melt, cool, and clean machined parts. During the use of cutting fluids, processes such as pump circulation, spraying, and intense impact with high-speed rotating tools or workpieces, as well as high-temperature evaporation, will occur. The cutting fluid condenses with other small droplets or particles in the air as nuclei, thus forming oil mist. If these oil mists are not collected and processed in a timely manner, they will affect the normal operation of mechanical equipment, and at the same time, they will also produce a foul smell, causing adverse effects on the respiratory system and skin health of the human body.

[0003] Traditional oil mist purification methods mainly include filtration, centrifugal separation, electrostatic methods, etc. The filtration method has a large filtration resistance, and the filter material is easily blocked, with high maintenance and replacement costs; the centrifugal separation method has an unsatisfactory separation effect for small-particle oil mist; the electrostatic method has extremely high maintenance costs and there is a fire risk, and a fire extinguishing system needs to be equipped.

[0004] Therefore, it is urgent to propose an oil mist purification device to solve the above technical problems in the prior art. Summary of the Invention

[0005] Based on the above, the purpose of the present invention is to provide an oil mist purification device to improve the oil mist removal effect and reduce the filtration resistance.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An oil mist purification device includes a housing, an air inlet and an air outlet are provided on the housing, and the air inlet is communicated with the air outlet. It is characterized in that the oil mist purification device further includes:

[0008] A centrifugal impeller is arranged in the housing, and the centrifugal impeller is arranged opposite to the air inlet;

[0009] A filter assembly is arranged in the housing. The filter assembly includes a packing layer, and the packing layer is arranged around the outer periphery of the centrifugal impeller at intervals. The oil mist waste gas flows through the filter assembly to the air outlet.

[0010] As a preferred scheme of the oil mist purification device, the filter assembly further includes:

[0011] A filter screen and a protective net, the filter screen is annularly arranged around the outer periphery of the centrifugal impeller, the protective net is in a "Ω" shape and is spaced around the outside of the filter screen, both ends of the protective net are respectively connected to the housing, and an accommodation cavity is formed between the filter screen, the protective net and the housing, and a filler is filled in the accommodation cavity to form the filler layer.

[0012] As a preferred solution of an oil mist purification device, it further includes:

[0013] A spray assembly, which is preferably arc-shaped and arranged around the outside of the protective net, and the spray assembly is configured to be able to spray cleaning liquid onto the filter assembly and the centrifugal impeller.

[0014] As a preferred solution of an oil mist purification device, the spray assembly includes:

[0015] A spray pipe, a nozzle, a liquid inlet pipe and a liquid discharge pipe, the spray pipe is preferably arc-shaped and arranged around the outside of the protective net, the nozzle is connected to the spray pipe and is arranged towards the protective net, one end of the liquid inlet pipe is connected to the spray pipe, and the other end extends out of the housing for connecting to an external water source, and one end of the liquid discharge pipe is connected to the bottom of the housing, and the other end is connected to the external environment.

[0016] As a preferred solution of an oil mist purification device, the number of the nozzles is set to be multiple, and the multiple nozzles are spaced apart along the circumferential direction of the spray pipe and are all arranged to extend along the radial direction of the centrifugal impeller.

[0017] As a preferred solution of an oil mist purification device, the spray assembly further includes:

[0018] A leak-proof pipe, which is located outside the housing and is connected to the side wall of the liquid discharge pipe to prevent the oil mist exhaust gas from leaking from the liquid discharge pipe.

[0019] As a preferred solution of an oil mist purification device, the filter assembly further includes:

[0020] A feed pipe, one end of which is connected to the filler layer, and the other end extends out of the housing;

[0021] A discharge port, which is connected to the bottom of the filler layer for discharging the ineffective filler.

[0022] As a preferred solution of an oil mist purification device, it further includes:

[0023] A baffle, which is in a "Ω" shape and is arranged around the outside of the spray assembly, both ends of the baffle are respectively connected to the housing, and ventilation holes are respectively arranged at both ends of the baffle.

[0024] As a preferred solution of an oil mist purification device, it further includes:

[0025] A deodorizing component, which is arranged inside the housing and downstream of the filtering component.

[0026] As a preferred embodiment of an oil mist purification device, it further includes:

[0027] An overflow port, which is opened on the side wall of the housing, and the overflow port is located between the filtering component and the deodorizing component.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides an oil mist purification device, which includes a housing, a centrifugal impeller and a filtering component arranged inside the housing. An air inlet and an air outlet are arranged on the housing and are communicated with each other. The centrifugal impeller is arranged opposite to the air inlet. The filtering component includes a packing layer. By arranging the packing layer around the outer periphery of the centrifugal impeller, the oil mist waste gas entering from the air inlet removes the oil mist under the dual actions of centrifugal collision and filtration, strengthening the removal effect of the oil mist. And since the filtering component including the packing layer is used to replace the traditional filter screen, it can remove the fine-grade oil mist, reduce the filtration resistance and improve the oil mist removal effect. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0031] Figure 1 It is a schematic structural diagram of the oil mist purification device provided by the embodiment of the present invention;

[0032] Figure 2 It is a schematic cross-sectional structural diagram of the side view of the oil mist purification device provided by the embodiment of the present invention.

[0033] In the figure:

[0034] 1 - Housing;

[0035] 2 - Centrifugal impeller;

[0036] 3 - Filtering component; 31 - Packing layer; 32 - Filter screen; 33 - Protective net; 34 - Feed pipe; 35 - Discharge port;

[0037] 4 - Spraying component; 41 - Spray pipe; 42 - Spray head; 43 - Liquid inlet pipe; 44 - Liquid discharge pipe; 45 - Anti-leakage pipe; 451 - Ventilation port; 452 - Liquid discharge port;

[0038] 5 - Baffle; 6 - Deodorization component; 7 - Overflow port; 8 - Primary filter; 9 - Centrifugal motor; 10 - Sealing plate. Detailed implementation mode

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the sake of description, only the parts related to the present invention are shown in the drawings, rather than all the structures.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the non - direct contact between the first and second features but through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0042] In the description of this embodiment, the orientation or positional relationship such as "above", "below", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] Such as Figure 1As shown in the figure, this embodiment provides an oil mist purification device, which includes a housing 1. An air inlet and an air outlet are provided on the housing 1, and the air inlet is communicated with the air outlet. An air inlet area, an oil removal area, a dehumidification area, and a deodorization area are sequentially arranged in the housing 1 along the direction from the air inlet to the air outlet. Specifically, a primary filter screen 8 is arranged in the air inlet area to remove coarse particles larger than 10 μm in the oil mist waste gas. In order to achieve the maximum filtering effect, the primary filter screen 8 is vertically connected to the side wall of the housing 1, and the size of the primary filter screen 8 is adapted to the size of the housing 1. Preferably, the primary filter screen 8 is a metal mesh, which has good impact resistance and dust collection effect.

[0044] As Figure 2 shown, the oil removal area includes a centrifugal impeller 2 and a filter assembly 3. The centrifugal impeller 2 is arranged opposite to the air inlet, and the centrifugal impeller 2 is driven by a centrifugal motor 9. The centrifugal motor 9 is arranged outside the housing 1. The oil mist waste gas flows through the filter assembly 3 towards the air outlet. The filter assembly 3 includes a packing layer 31, a filter screen 32, and a protective net 33. The filter screen 32 is arranged in a ring around the outer periphery of the centrifugal impeller 2. The protective net 33 is in a "Ω" shape and is arranged at intervals outside the filter screen 32. The two ends of the protective net 33 are respectively connected to the housing 1. A receiving cavity is formed between the filter screen 32, the protective net 33, and the housing 1, and the receiving cavity is filled with packing to form the packing layer 31. The filter screen 32 and the protective net 33 are preferably metal meshes. The filter screen 32 made of metal is used for preliminary centrifugal collection of oil mist and blocks the packing to prevent the packing from entering the centrifugal impeller 2 and damaging the centrifugal impeller 2. The oil mist waste gas entering from the air inlet first passes through the primary filter screen 8 for filtration, and then the centrifugal impeller 2 throws the oil mist waste gas onto the filter screen 32 and into the packing layer 31. The oil mist is removed through the centrifugal collision of the filter screen 32 and the packing layer 31, completing the first oil-gas separation. The oil mist waste gas after the first oil-gas separation is filtered through the packing layer 31 under the centrifugal action of the centrifugal impeller 2 for the second oil-gas separation. The gas after removing the oil mist flows into the downstream of the filter assembly 3. Through the double centrifugal collision of the centrifugal impeller 2 and the packing layer 31 and the filtering action of the packing layer 31, the removal effect of the oil mist is strengthened; and since the packing layer 31 is used instead of the traditional filter screen, fine-grade oil mist can be removed, the filtering resistance can be reduced, and the effect of removing oil mist can be improved. In order to ensure that all the gas entering from the air inlet area enters the oil removal area to improve the filtering effect, in this embodiment, the air inlet is arranged perpendicular to the air outlet, the centrifugal impeller 2 is arranged at the junction of the two, the diameter of the filter screen 32 is equal to the diameter of the air inlet, and the width of the filter assembly 3 is equal to the width of the housing 1 to ensure that the oil mist waste gas first passes through the filter assembly 3 for filtration and then flows towards the dehumidification area downstream of the filter assembly 3. Of course, in other embodiments, the position and size of the filter assembly 3 can be designed according to actual needs.

[0045] According to different types of oil mist waste gas and the required oil mist removal effect, the filler can be selected from oil-absorbing fiber fillers and metal, ceramic, polytetrafluoro materials and antibacterial materials that have been treated with oil repellency. Preferably, the filler is a granular filler to prevent the filler layer 31 from being blocked and facilitate the replacement of the filler. Further, the filler layer 31 is divided into one or more layers. When the filler layer 31 is designed as multiple layers, the filler particles in the filler layer 31 become finer from bottom to top. The coarser filler particles at the lower part provide larger pores and sufficient storage space for the penetration and collection of liquid, and the finer filler particles at the upper part fully filter the oil mist waste gas to improve the filtering effect. Moreover, the filler in the filtering component 3 has the advantages of a long service life and a low replacement frequency.

[0046] To facilitate the replacement and replenishment of the filler, the filtering component 3 further includes a feed pipe 34 and a discharge port 35. One end of the feed pipe 34 communicates with the filler layer 31, and the other end extends out of the housing 1. The discharge port 35 is opened on the housing 1 and communicates with the filler layer 31. When the filler fails, the discharge port 35 is opened to discharge the filler from the housing 1. After emptying the filler layer 31, the discharge port 35 is closed, and new filler is filled into the filler layer 31 through the feed pipe 34 to improve the convenience of filler replacement.

[0047] Further, the oil mist purification device further includes a baffle 5. The baffle 5 is arranged in an "Ω" shape around the outside of the filtering component 3. The two ends of the baffle 5 are respectively connected to the housing 1, and ventilation holes are respectively arranged at the two ends of the baffle 5. The baffle 5 can prevent the oil mist waste gas from directly entering the dehumidification area and the deodorization area through the upper filler layer 31, increasing the load of the dehumidification area and the deodorization area. The ventilation holes at both ends of the baffle 5 are used to block the filler and allow the gas after oil removal to flow into the air duct between the "Ω" - shaped baffle 5 and the housing 1 and flow downstream to the dehumidification area. The baffle 5 is preferably made of a metal material. Of course, in other embodiments, the baffle 5 can be composed of a middle plate and two perforated plates. The middle plate is arranged in a superior arc shape around the outside of the filtering component 3. The two perforated plates are connected to the two ends of the middle plate, and both of the two perforated plates are connected to the housing 1. Preferably, both the middle plate and the perforated plates are made of a metal material.

[0048] Further, the oil mist purification device further includes a spray component 4. The spray component 4 is arranged in a superior arc shape around the protection net 33 and the baffle 5 and is connected to the baffle 5. The spray component 4 is configured to be able to spray cleaning liquid onto the filtering component 3 and the centrifugal impeller 2, so that the filtering component 3 is not easily blocked, and the filtering effect is improved and the cleaning function is realized.

[0049] Specifically, the spraying assembly 4 includes a spray pipe 41, a spray head 42, a liquid inlet pipe 43 and a liquid discharge pipe 44. The spray pipe 41 is arranged in a superior arc shape outside the protective net 33. The spray head 42 is connected to the spray pipe 41 and is arranged towards the protective net 33. One end of the liquid inlet pipe 43 is connected to the spray pipe 41, and the other end extends out of the housing 1 for connecting to an external water source. One end of the liquid discharge pipe 44 is connected to the bottom of the housing 1, and the other end is connected to the external environment and is provided with a valve. Arranging the spray pipe 41 in a superior arc shape outside the protective net 33 can prevent the packing in the packing layer 31 from blocking the spray head 42. The spraying assembly 4 has two cleaning modes: spraying during operation and cleaning during shutdown. When the oil mist purification device is in an operating state, the cleaning liquid is introduced into the spray pipe 41 from the liquid inlet pipe 43 and then sprayed towards the filter assembly 3 and the centrifugal impeller 2 through the spray head 42 to clean the packing layer 31, the filter net 32 and the centrifugal impeller 2, ensuring the oil removal efficiency. The oil mist purification device further includes a sealing plate 10 to prevent the cleaning liquid from overflowing. When the oil mist purification device is in a shutdown state after operation, insert the sealing plate 10 and start the spraying assembly 4 to soak and clean the internal components of the device. The self-cleaning function can be realized without disassembling the oil mist purification device. At the same time, the centrifugal impeller 2 can be started for stirring to enhance the cleaning effect. Optionally, according to the chemical properties of the oil mist and the malodorous gas, chemical detergents such as H2SO4, NaOH, and NaClO3 can be added to the cleaning liquid.

[0050] Preferably, a plurality of spray heads 42 are provided. The plurality of spray heads 42 are spaced apart along the circumferential direction of the spray pipe 41 and are all arranged to extend along the radial direction of the centrifugal impeller 2. The two spray heads 42 at both ends of the spray pipe 41 are both arranged downward, so that the cleaning liquid is evenly distributed, enhancing the oil removal effect and the cleaning effect.

[0051] Preferably, the spraying assembly 4 further includes a leak-proof pipe 45. The leak-proof pipe 45 is located outside the housing 1 and is connected to the side wall of the liquid discharge pipe 44 to prevent gas from leaking out of the liquid discharge pipe 44. Preferably, the leak-proof pipe 45 is an inverted U-shaped pipe. The inverted U-shaped pipe is connected to the side wall of the liquid discharge pipe 44, and the height of the inverted U-shaped pipe does not exceed the filter net 32. An air vent 451 is connected to one side of the inverted U-shaped pipe, and a valve is provided at the air vent 451. A valve is also provided at the liquid discharge port 452 of the inverted U-shaped pipe. When the oil mist purification device is operating, the valve on the liquid discharge pipe 44 is closed, and the oil droplets discharged through the filter assembly 3 accumulate in the liquid discharge pipe 44, so that the filtered gas cannot be discharged from the liquid discharge pipe 44. When the liquid level height of the waste liquid in the inverted U-shaped pipe exceeds the top height of the inverted U-shaped pipe and the waste liquid enters the air vent 451, the oil droplets or the cleaning liquid are discharged from the liquid discharge port 452 of the inverted U-shaped pipe.

[0052] Under the above structure, the oil mist waste gas enters the dehumidification area downstream of the oil removal area through the ventilation holes on both sides of the baffle 5 after centrifugal collision and filtration. The dehumidification area includes a dehumidification component, which is used to remove the moisture in the gas to prevent the moisture from affecting the deodorization effect of the deodorization area. The dehumidification component is not shown in the figure. Further, the dehumidification component includes a dehumidification upper orifice plate and a dehumidification lower orifice plate, which are spaced and connected to the inner wall of the housing 1. A desiccant is filled between the dehumidification upper orifice plate and the dehumidification lower orifice plate to form a desiccant layer. The gas flows through the dehumidification lower orifice plate, the desiccant layer, and the dehumidification upper orifice plate in sequence and then flows into the deodorization area downstream of the dehumidification area. Of course, in other embodiments, the dehumidification component can also be composed of a dehumidification box body and a desiccant. The dehumidification box body is connected to the housing 1, the desiccant is filled inside the dehumidification box body, and ventilation holes are provided on both the upper and lower end faces of the dehumidification box body to allow the gas to pass through.

[0053] The deodorization area includes a deodorization component 6 for purifying the dried gas. The deodorization component 6 is arranged between the dehumidification component and the air outlet and is connected to the housing 1. The deodorization component 6 includes a deodorization upper orifice plate and a deodorization lower orifice plate, which are spaced and connected to the housing 1. A deodorant is filled between the deodorization upper orifice plate and the deodorization lower orifice plate to form a deodorant layer. The dried gas flows through the deodorization upper orifice plate, the deodorant layer, and the deodorization lower orifice plate in sequence and then flows towards the air outlet for discharge. Of course, in other embodiments, the deodorization component 6 can also be composed of a deodorization box body and a deodorant. The deodorization box body is connected to the housing 1, the desiccant is filled inside the deodorization box body, and ventilation holes are provided on both the upper and lower end faces of the deodorization box body to allow the gas to pass through. Optionally, the deodorization component 6 can be an activated carbon adsorption component or a plasma deodorization component.

[0054] To prevent the cleaning liquid from entering the dehumidification area and the deodorization area when deeply cleaning the components in the oil removal area, the oil mist purification device further includes an overflow port 7. The overflow port 7 is opened on the side wall of the housing 1, and the overflow port 7 is located between the filter screen 32 and the baffle 5. A valve is provided at the overflow port 7. When the water level of the cleaning liquid is higher than the height of the overflow port 7, the cleaning liquid can automatically drain from the overflow port 7, preventing the cleaning liquid from entering the dehumidification area and the deodorization area and thus affecting the dehumidification effect and the deodorization effect. Preferably, the diameter of the overflow port 7 is larger than the diameter of the liquid inlet pipe 43 to enable the cleaning liquid to be drained in time.

[0055] The following is the working process of the oil mist purification device:

[0056] Close the valves at the drain pipe 44 and the overflow port 7, open the valves at the drain port 452 and the vent port 451 of the inverted U-shaped pipe. Under the action of the centrifugal impeller 2, the oil mist waste gas flows into the air inlet area from the air inlet and is filtered through the primary filter screen 8 to remove coarse particle impurities, and then reaches the centrifugal impeller 2. The oil droplets are separated through the centrifugal collision of the centrifugal impeller 2 and the packing layer 31. The filter screen 32 surrounding the outer periphery of the centrifugal impeller 2 preliminarily collects the separated oil droplets. The gas after centrifugal filtration enters the packing layer 31 for filtration to separate small particle oil droplets. The gas after being filtered by the packing layer 31 flows into the dehumidification area through the vent holes at both ends of the baffle 5. The oil droplets separated twice flow into the drain pipe 44 at the lower part of the packing layer 31 and the inverted U-shaped pipe and are discharged. During the filtration process, if it is necessary to enhance the filtration effect, the cleaning liquid is introduced from the liquid inlet pipe 43 to clean the filter assembly 3 and the centrifugal impeller 2 to enhance the oil removal efficiency. The sprayed cleaning liquid also flows into the drain pipe 44 at the lower part of the packing layer 31 and the inverted U-shaped pipe. When the height of the waste liquid exceeds the height of the inverted U-shaped pipe, the waste liquid automatically discharges from the drain port 452 of the inverted U-shaped pipe. The gas flowing into the dehumidification area is dehumidified by the dehumidification component and then flows into the downstream deodorization area. The gas flowing into the deodorization area is discharged from the air outlet after deodorization and purification.

[0057] When the filtration effect of the packing is significantly reduced or it is necessary to replace the packing with different filtration functions, open the discharge port 35 to discharge the packing in the packing layer 31, and then fill in the new packing through the feed pipe 34 to complete the replacement of the failed packing. When it is necessary to clean the internal components, insert the sealing plate 10 and introduce the cleaning liquid through the liquid inlet pipe 43. At this time, close the valves at the drain pipe 44 and the drain port 452 and the vent port 451 of the inverted U-shaped pipe, and open the valve at the overflow port 7 so that the cleaning liquid soaks and cleans the internal components. At the same time, the centrifugal impeller 2 can be started to increase the cleaning intensity. When the liquid level height of the cleaning liquid exceeds the overflow port 7, the cleaning liquid automatically discharges from the overflow port 7. By controlling the liquid level height of the cleaning liquid, when the liquid level is kept below the overflow port 7, the soaking function is realized; when the cleaning liquid is continuously introduced, the cleaning liquid automatically discharges from the overflow port 7 to realize the flushing mode. When the soaking and cleaning are completed, open the valve of the drain pipe 44 to discharge the cleaning liquid to complete the internal cleaning of the oil mist purification device.

[0058] Note that the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An oil mist removal and purification device, comprising a housing (1), wherein an air inlet and an air outlet are provided on the housing (1), and the air inlet is communicated with the air outlet, and is characterized in that, The oil mist purification device further includes: A centrifugal impeller (2) disposed inside the housing (1), and the centrifugal impeller (2) is disposed opposite to the air inlet; A filter assembly (3) disposed inside the housing (1), the filter assembly (3) includes a packing layer (31), the packing layer (31) surrounds the outer periphery of the centrifugal impeller (2), and the oil mist exhaust gas flows through the filter assembly (3) towards the air outlet; the packing layer (31) is divided into one or more layers. When the packing layer (31) is designed as multiple layers, the packing particles in the packing layer (31) become finer from bottom to top; The filter assembly (3) further includes: A filter net (32) and a protective net (33), the filter net (32) surrounds the outer periphery of the centrifugal impeller (2) in a ring shape, the protective net (33) is in an "Ω" shape and surrounds the outside of the filter net (32) at intervals, both ends of the protective net (33) are respectively connected to the housing (1), and an accommodation cavity is formed between the filter net (32), the protective net (33) and the housing (1), and the accommodation cavity is filled with packing to form the packing layer (31); A spray assembly (4) surrounds the outside of the protective net (33) in a superior arc shape, and the spray assembly (4) is configured to be able to spray cleaning liquid onto the filter assembly (3) and the centrifugal impeller (2).

2. The oil mist removal and purification device according to claim 1, wherein The spray assembly (4) includes: A spray pipe (41), a spray head (42), a liquid inlet pipe (43) and a drain pipe (44), the spray pipe (41) surrounds the outside of the protective net (33) in a superior arc shape, the spray head (42) is communicated with the spray pipe (41) and is disposed towards the protective net (33), one end of the liquid inlet pipe (43) is communicated with the spray pipe (41), and the other end extends out of the housing (1) for connecting to an external water source, and one end of the drain pipe (44) is communicated with the bottom of the housing (1), and the other end is communicated with the external environment.

3. The oil mist purification device according to claim 2, characterized in that, The number of the spray heads (42) is set to be multiple, and the multiple spray heads (42) are spaced apart along the circumferential direction of the spray pipe (41) and all extend along the radial direction of the centrifugal impeller (2).

4. The oil mist removal and purification device according to claim 2, characterized in that The spray assembly (4) further includes: A leak-proof pipe (45) located outside the housing (1) and communicated with the side wall of the drain pipe (44) to prevent the oil mist exhaust gas from leaking from the drain pipe (44).

5. The oil mist purification device according to claim 1, characterized in that, The filter assembly (3) further includes: A feed pipe (34), one end of which is communicated with the packing layer (31), and the other end extends out of the housing (1); A discharge port (35) communicated with the bottom of the packing layer (31) for discharging the ineffective packing.

6. The oil mist purification device according to claim 1, wherein It further includes: A baffle (5) in an "Ω" shape and surrounding the outside of the spray assembly (4), both ends of the baffle (5) are respectively connected to the housing (1), and ventilation holes are respectively provided at both ends of the baffle (5).

7. The oil mist removal and purification device according to claim 1, characterized in that, It further includes: An odor removal assembly (6) disposed inside the housing (1) and located downstream of the filter assembly (3).

8. The oil mist purification device according to claim 7, characterized in that, It further includes: Overflow opening (7), which is opened on the side wall of the housing (1), and the overflow opening (7) is located between the filtering assembly (3) and the deodorizing assembly (6).

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