Oil mist treatment device for industrial equipment

Abstract

The invention discloses an oil mist treatment device for industrial equipment. The oil mist treatment device sequentially comprises a main machine with an inner filter element, an extension body and an outer filter element from bottom to top, the main machine further comprises a cylindrical shell, a motor and an impeller. The inner cavity of the shell is divided into an upper area and a lower area by the flat partition wall; the motor is fixed in the upper area along the central axis of the shell. The impeller is located in the lower area and connected to the output end of the lower end of the motor. The inner wall of the shell is provided with an upper spiral oil duct located in the upper area and a lower spiral oil duct located in the lower area, the upper area is provided with an annular cavity, the inner side of the annular cavity is provided with an annular air outlet wall, the upper spiral oil duct is located in the annular cavity, and the bottom of the annular cavity is communicated with the lower area; an annular outlet is formed in the inner side of the annular cavity, and a buffer distance is formed between the lower edge of the annular outlet and the horizontal partition wall; the inner filter element is annular and is attached to the annular outlet; the expansion body is provided with an expansion cavity with the inner diameter gradually reduced from top to bottom, and the inner diameter of the lower portion of the expansion cavity is the same as the inner diameter of the shell. And the outer filter element is arranged above the expansion body with the upper opening.

Description

Technical Field

[0001] This invention relates to the field of environmental purification equipment, and more specifically to an oil mist treatment device for industrial equipment. Background Technology

[0002] Oil mist treatment equipment is an indispensable environmental protection tool in machining, industrial cleaning, and other fields. It is mainly used to collect and purify mixtures of oil mist, water mist, and dust generated during processes such as cutting, grinding, and forging. Its core function is to prevent harmful aerosols from spreading into the workshop environment, protect the health of operators, maintain stable equipment operation, and meet increasingly stringent environmental emission requirements. Technological development in this type of equipment mainly focuses on improving oil-gas separation efficiency, extending filter media life, optimizing maintenance convenience, and adapting to complex working conditions.

[0003] Patent document CN108744817A discloses an oil mist treatment device with a double spiral, including a base and a cylinder connected to the base. The bottom end of the cylinder is provided with an air inlet, the inner wall of the cylinder is provided with an upper spiral and a lower spiral, and an oil outlet is connected through the side wall of the cylinder. A partition is detachably connected in the cylinder. The second lug of the partition is connected to the first lug of the inner side wall of the cylinder with a second bolt. A motor is provided at the upper end of the partition. A rotating shaft fixedly connected to the output end of the motor passes through the partition. An impeller is concentrically connected to the bottom end of the rotating shaft. A filter element is detachably connected to the upper end of the cylinder by fasteners.

[0004] Patent document CN119926088B discloses a high-efficiency oil mist filtration device, including a shell, an interception mechanism, and a power mechanism. The interception mechanism is located inside the shell, and the bottom of the shell is connected to the oil mist outlet of the device. The power mechanism is located at the top of the shell and drives the interception mechanism to operate. The interception mechanism includes a mesh cylinder and multiple blades. The top of the mesh cylinder is connected to the output end of the power mechanism. Multiple sets of pushing mechanisms are provided inside the mesh cylinder. Each set of pushing mechanisms corresponds to one blade and is located on the windward side of the blade. The pushing mechanism includes multiple scrapers and a circulation component. The multiple scrapers are all fixedly connected to the circulation component and are evenly distributed on the outside of the circulation component. A linkage mechanism is provided on the bottom side of the shell, and the multiple sets of circulation components rotate under the drive of the linkage mechanism.

[0005] In practical applications, these oil mist filtration devices have been abandoned by companies in the production process either because of their poor oil removal effect or because the filter elements need to be replaced frequently and the cost is too high. Summary of the Invention

[0006] To address the shortcomings of existing solutions, this invention provides an oil mist treatment device for industrial equipment that offers better oil filtration and separation / purification effects.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an oil mist treatment device for industrial equipment, which includes, from bottom to top, a main body with an inner filter element, an extension body and an outer filter element; The main unit also includes a cylindrical housing, a motor, and an impeller; a mist inlet pipe is connected to the bottom center of the housing; The housing is provided with a horizontal partition wall, which divides the housing cavity into an upper region and a lower region. The motor is fixed in the upper region along the central axis of the housing, and the impeller is located in the lower region and connected to the output end of the lower end of the motor; The inner wall of the housing is provided with an upper spiral oil passage located in the upper region and a lower spiral oil passage located in the lower region. The upper spiral oil passage and the lower spiral oil passage have an L-shaped cross section to form a spiral baffle on the inner side. The upper and lower spiral oil passages have opposite spiral directions and converge at the junction of the two zones. The housing is provided with an oil outlet at the junction of the upper and lower spiral oil passages. The upper region is provided with an annular cavity, the inner side of the annular cavity is provided with an annular air outlet wall, the upper spiral oil passage is located in the annular cavity, and the bottom of the annular cavity is connected to the lower region; The inner side of the annular cavity near the horizontal partition wall is provided with an annular outlet, and there is a buffer distance between the lower edge of the annular outlet and the horizontal partition wall. The inner filter element is annular and is disposed against the annular outlet, and both the top and bottom of the inner filter element are sealed; the inner side of the inner filter element is provided with the annular air outlet wall; The expansion body has an expansion cavity whose inner diameter gradually decreases from top to bottom, and the lower inner diameter of the expansion cavity is the same as the inner diameter of the housing; the outer filter element is disposed above the expansion body with the upper opening.

[0008] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the cross-section of the expansion body is square, the expansion body includes a funnel part and a vertical part, the inner cavity of the funnel part forms the expansion cavity, and the outer filter element is square and is fitted in the inner cavity of the vertical part.

[0009] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the housing is provided with a partition wall connected in a horizontal folding manner, the partition wall includes a first horizontal partition wall, a vertical partition wall and a second horizontal partition wall; the inner filter element is located below the second upper partition wall; The horizontal partition wall has an outer annular wall at its outer edge. The vertical partition wall and the outer annular wall are located on the same circumference. The annular outlet is formed between the outer annular wall and the vertical partition wall. A circumferential gap is provided between the inner annular wall and the spiral baffle wall.

[0010] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the horizontal partition wall is provided with an inner annular wall located inside the outer annular wall and concentric with it; an installation groove is formed between the outer annular wall and the inner annular wall, and the inner filter element is disposed in the installation groove.

[0011] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: the annular air outlet wall is embedded between the inner annular wall and the inner circumferential surface of the inner filter element, and the inner annular wall and the outer annular wall block the lower part of the annular air outlet wall and the inner filter element.

[0012] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is that the inner annular wall and the outer annular wall are of equal height and the height is one-third of the inner filter element.

[0013] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the oil outlet is provided with an oil outlet pipe, and the oil outlet pipe is arranged tangentially along the shell.

[0014] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: a filter screen is provided at the entrance of the mist inlet pipe into the housing.

[0015] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is that the external filter element is a glass fiber filter.

[0016] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the outer filter element consists of multiple arrayed and horizontally stacked vertical filter plates, the vertical filter plates are wavy, and wavy filter channels are formed between adjacent vertical filter plates.

[0017] Compared with existing technologies, the beneficial effects of this invention are as follows: the extension body allows the oil mist to undergo secondary separation before entering the outer filter element at the final end, resulting in better oil extraction and a significantly longer service life for the outer filter element. The L-shaped spiral oil channel, with its spiral baffle, provides a vertical impact surface for oil droplets in the rotating airflow, increasing inertial collision efficiency. This makes it easier for droplets to adhere after impact, and the resulting liquid film flows downwards along the wall. Furthermore, the buffer distance between the lower edge of the annular outlet and the horizontal partition ensures that the airflow must rise axially to a certain height before radially entering the filtration zone. This significantly increases the effective residence time of oil mist particles in the strong swirling flow field, representing a fundamental structural optimization for improving the overall oil extraction rate. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0019] Figure 1 This is a schematic diagram of an oil mist treatment device for industrial equipment. Figure 2 A cross-sectional perspective view of an oil mist treatment device for industrial equipment; Figure 3 A cross-sectional view of an oil mist treatment device for industrial equipment; Figure 4 This is a schematic diagram of the airflow in an oil mist treatment device for industrial equipment. Figure 5 An exploded view of an oil mist treatment device for industrial equipment; Figure 6 An exploded view of an oil mist treatment device for industrial equipment; Figure 7 A schematic diagram of the main unit of an oil mist treatment device for industrial equipment; Figure 8 This is a schematic diagram of the housing of an oil mist treatment device for industrial equipment.

[0020] 1. Inner filter element; 2. Main unit; 3. Expansion body; 4. Outer filter element; 5. Housing; 6. Motor; 7. Impeller; 8. Mist inlet pipe; 9. Horizontal partition wall; 10. Upper zone; 11. Lower zone; 12. Upper spiral oil passage; 13. Lower spiral oil passage; 14. Spiral baffle wall; 15. Oil outlet; 16. Annular cavity; 17. Annular air outlet wall; 18. Annular outlet; 19. Expansion cavity; 20. Oil outlet pipe; 21. Filter screen; 22. Funnel section; 23. Vertical section; 24. First horizontal partition wall; 25. Vertical partition wall; 26. Second horizontal partition wall; 27. Outer annular wall; 28. Inner annular wall; 23. Annular support section; 30. Isolation wall; 40. Support frame. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0022] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and should not be considered as limitations on this invention.

[0024] like Figure 1-3 As shown, this embodiment provides an oil mist treatment device for industrial equipment, which, from bottom to top, includes a main unit 2 with an inner filter element 1, an extension body 3, and an outer filter element 4. The main unit 2 is supported by a support frame 40.

[0025] like Figure 1-3 As shown in Figures 5-6, the main unit 2 also includes a cylindrical housing 5, a motor 6, and an impeller 7. A mist inlet pipe 8 is connected to the middle of the bottom of the housing 5. A horizontal partition 9 is provided inside the housing 5, which divides the inner cavity of the housing 5 into an upper section 10 and a lower section 11.

[0026] like Figure 1-3 As shown in Figures 5-6, the motor 6 is fixed in the upper region 10 along the central axis of the housing 5, and the impeller 7 is located in the lower region 11 and connected to the output end of the lower end of the motor 6. The inner wall of the housing 5 is provided with an upper spiral oil passage 12 located in the upper region 10 and a lower spiral oil passage 13 located in the lower region 11. The cross-sections of the upper spiral oil passage 12 and the lower spiral oil passage 13 are L-shaped to form a spiral baffle 14 on the inner side. The upper spiral oil passage 12 and the lower spiral oil passage 13 have opposite spiral directions and converge at the junction of the two regions. The housing 5 is provided with an oil outlet 15 at the confluence of the upper spiral oil passage 12 and the lower spiral oil passage 13.

[0027] like Figure 2-4 As shown in Figure 7, the upper region 10 has an annular cavity 16, and an annular air outlet wall 17 is provided on the inner side of the annular cavity 16. The upper spiral oil passage 12 is located inside the annular cavity 16, and the bottom of the annular cavity 16 communicates with the lower region 11. An annular outlet 18 is provided on the inner side of the annular cavity 16 near the horizontal partition wall 9, and there is a buffer distance between the lower edge of the annular outlet 18 and the horizontal partition wall 9. The inner filter element 1 is annular and is disposed against the annular outlet 18, and both the upper and lower parts of the inner filter element 1 are sealed. An annular air outlet wall 17 is provided on the inner side of the inner filter element 1.

[0028] like Figure 1-5 As shown, the expansion body 3 has an expansion cavity 19 whose inner diameter gradually decreases from top to bottom, and the lower inner diameter of the expansion cavity 19 is the same as the inner diameter of the housing 5. The outer filter element 4 is disposed above the upper open expansion body 3.

[0029] It should be noted that the traditional cylindrical docking filtration method is prone to causing the rotating airflow to continue to the inner filter element 1 and the outer filter element 4, producing the "rope core effect", that is, the airflow is concentrated through the central area of ​​the filter element, resulting in excessive local load on the filter medium, uneven utilization rate, and rapid increase in pressure drop.

[0030] like Figure 4 As shown, in this embodiment, after the airflow passes through the strong swirling centrifugal separation area of ​​the inner filter element 1, it still carries a small amount of fine oil mist particles. The arrangement of the expansion body 3 and the expansion cavity 19 ensures that this part of the oil does not directly enter the outer filter element 4.

[0031] Within the expansion chamber 19, as the cross-section gradually expands, both the axial and tangential velocities of the airflow rapidly decrease. This reduction in velocity means a decrease in the airflow's ability to carry droplets. Larger droplets or those that have coalesced begin to detach from the airflow line under gravity, settling directly onto the inner wall of the expansion body 3 and flowing back, thus completing secondary coarse separation before entering the final external filter element 4. This also results in better oil mist treatment and significantly extends the service life of the external filter element 4.

[0032] Furthermore, upon entering the expander 3, the high-speed rotating airflow is disrupted by the sudden movement away from the wall and the change in pressure gradient, disrupting the original forced vortex structure. A relatively low-turbulence region, or stagnation region, is formed in the central or near-wall area of ​​the expander cavity 19. In this stagnation region, the airflow velocity decreases, but turbulent pulsations still exist. According to the theory of turbulent coalescence, the movement path of fine droplets in this region is complex, and the relative velocity increases, leading to a significant increase in the collision frequency between droplets. Small droplets coalesce into larger droplets through collisions. As the droplet size increases, the inertial force strengthens. This makes them more easily intercepted by the filter element fibers or captured through inertial collisions when they subsequently flow through the outer filter element 4, rather than flowing around the filter element fibers with the airflow, thus improving the oil filtration effect.

[0033] Furthermore, traditional spiral oil channels are two-dimensional guide vanes, whose main function is to guide the airflow rotation. In this embodiment, the L-shaped structure adds a vertical spiral baffle 14, which has several key functions.

[0034] First, the spiral baffle 14 provides a vertical impact surface for oil droplets in the rotating airflow. As the oil droplets and particles follow the airflow, they cannot bypass this surface due to inertia, thus increasing the efficiency of inertial collisions and resulting in collision capture.

[0035] Second, a low-velocity boundary layer forms near the vertical baffle surface, making it easier for droplets to adhere after impact and for the resulting liquid film to flow downwards along the wall. The L-shaped structure places the liquid film within the wake region or boundary layer of the main airflow, significantly reducing the aerodynamic shear force and effectively suppressing re-atomization. Under the combined action of gravity and the tangential component of the airflow, the liquid film is stably guided to the oil outlet 15.

[0036] Third, the gap between the L-shaped structure and the inner filter element 1 effectively creates a quasi-static settling zone. According to two-phase flow theory, the centrifugal force in the main swirling zone throws particles towards the wall, and some small particles may be re-entrained by the airflow. The gap, decoupled from the main helical guide, experiences a decrease in tangential velocity, forming a region with low turbulence intensity. Here, the airflow velocity decreases, and the relative velocity of the droplets decreases, but the turbulent vortices provide collision opportunities for the droplets. According to the theory of turbulent coalescence, the collision frequency in isotropic turbulence is proportional to the square root of the turbulent energy dissipation rate. Fine droplets undergo Brownian motion, turbulent diffusion, and velocity gradient-driven collisions, coalescing into larger droplets with an increased Stokes number. At lower tangential velocities, gravity settling becomes more prominent. This region effectively becomes a gravity-assisted settling chamber, allowing the coalesced droplets to fall directly rather than be re-carried upstream by the airflow, effectively enhancing the cascade separation effect.

[0037] In addition, such as Figure 4 As shown, from the perspective of aerosol separation, there is a buffer distance between the lower edge of the annular outlet 18 and the horizontal partition 9, which changes the flow field structure and particle trajectory within the equipment. The traditional design features a fully transparent annular outlet wall 17 and annular outlet 18. The rising airflow in the lower zone 11 can enter radially after passing the horizontal plane of the horizontal partition 9, causing some oil mist particles to short-circuit into the filtration zone due to insufficient centrifugal separation. After sealing the lower part, the lower part of the upper spiral oil passage 12 is transformed into a forced swirling pipe with a single axial outlet. All airflow must move axially to the upper opening of the annular outlet wall 17 to achieve radial flow. That is, all airflow must rise axially to a certain height before radially entering the filtration zone. The axial velocity component is restricted, significantly increasing the effective residence time of oil mist particles in the strong swirling flow field. According to Stokes' law, the centrifugal settling efficiency of particles is proportional to the residence time. Increased residence time directly improves the centrifugal separation efficiency for particles of various sizes. More importantly, this creates a forced swirling zone, increasing the number of rotations the particles undergo within the spiral channel, resulting in more effective centrifugal acceleration. At the same time, the axial velocity component is constrained, reducing particle escape caused by turbulent diffusion.

[0038] This structure eliminates potential localized low-pressure zones in the lower section, resulting in a more stable static pressure distribution throughout the spiral section and reducing abnormal localized eddies or jets caused by pressure differentials. It forces all oil mist particles to undergo a complete, bottom-up spiral trajectory, ensuring full treatment of the particle group by the centrifugal force field and preventing partial bypassing without sufficient separation. This improvement enhances the thoroughness of the pretreatment stage, ensuring that the vast majority of the liquid phase load is initially removed before entering the filtration unit, representing a fundamental structural optimization for improving overall oil yield.

[0039] like Figure 1 , 8 As shown, the oil outlet 15 is equipped with an oil outlet pipe 20, which is tangentially arranged along the housing 5. According to the principle of momentum, the liquid can be smoothly ejected from the oil outlet 15 due to its own rotational inertia. This not only reduces the oil discharge resistance and achieves rapid oil discharge, avoiding the accumulation of oil in the housing 5, but also effectively prevents the high-speed rotating airflow from leaking directly from the oil outlet 15, achieving a liquid seal-like effect.

[0040] like Figure 8 As shown, a filter screen 21 is installed at the point where the mist inlet pipe 8 enters the housing 5. This creates a physical barrier before the oil mist-containing gas enters the high-speed rotating impeller 7 and the spiral channel. It can intercept large particulate impurities, fibers, or any metal debris in the air, preventing them from impacting or jamming the high-speed rotating impeller 7 and avoiding equipment damage. At the same time, it can also disperse larger turbulent air masses, making the airflow distribution into the housing 5 more uniform, which is beneficial to the stable establishment of the subsequent swirling flow field.

[0041] like Figure 1-5 As shown, preferably, the cross-section of the expander 3 is square. The expander 3 includes a funnel portion 22 and a vertical portion 23. The inner cavity of the funnel portion 22 forms an expander cavity 19, and the outer filter element 4 is square and fits inside the inner cavity of the vertical portion 23. Preferably, the bottom of the vertical portion 23 has an annular support portion 230 for supporting the outer filter element 4. More preferably, the four corners of the cross-section of the funnel portion 22 are rounded, and the radius of the rounded corners gradually increases from bottom to top. When the circular cross-section is changed to a square cross-section, the airflow suddenly enters the square cross-section from the circular cross-section, generating strong vortices and flow separation in the four corner regions. These secondary flows drastically dissipate the rotational angular momentum of the airflow. The change in cross-sectional shape disrupts the axisymmetry, forcing the airflow to redistribute. Ideally, the square cross-section outlet can form a flatter axial velocity profile, providing uniform intake conditions for the subsequent cubic outer filter element 4 and avoiding local airflow short-circuiting or overload.

[0042] As a preferred option, the outer filter element 4 is a glass fiber filter. The outer filter element 4 consists of multiple horizontally stacked, arrayed vertical filter plates, which are wavy, forming wavy filtration channels between adjacent vertical filter plates. The wavy filter element significantly increases the filtration surface area. According to the single-fiber filtration efficiency model, for oil mist particles dominated by inertial collision and interception mechanisms, the filtration efficiency is positively correlated with the fiber surface area. More importantly, the wavy structure forms a tortuous flow channel, increasing the tortuosity of the airflow path through the filter element. This increases the contact time and enhances the inertial collision efficiency by changing the streamline direction. Simultaneously, since the first two stages of pretreatment have removed most of the droplets, the particle load entering the filter element is greatly reduced, the load increase on the filter element surface is slow, and the pressure drop rise rate is reduced, thereby extending the filter element's lifespan.

[0043] like Figure 2-4 As shown in Figures 6 and 7, the housing 5 has an isolation wall 30 connected in a horizontal-folded manner. The isolation wall 30 includes a first horizontal partition 24, a vertical partition 25, and a second horizontal partition 26. Preferably, the isolation wall and the annular air outlet wall 17 are an integral component. The inner filter element 1 is located below the second upper partition. The "horizontal-folded" isolation wall structure, that is, from horizontal to vertical and then back to horizontal, together with the annular wall of the housing 5 and the horizontal partition 9, forms an annular cavity 16. Through physical obstruction, the airflow undergoes a certain swirling separation before entering the filtration stage. At the same time, placing the inner filter element 1 below the second upper partition clarifies the installation position of the filter element, so that the air inlet surface of the filter element faces the buffered airflow area, avoiding the high-speed airflow directly scouring the surface of the filter element, which helps to extend the service life of the inner filter element 1.

[0044] like Figure 2-4 As shown, the outer edge of the horizontal partition 9 is provided with an outer annular wall 27. The vertical partition 25 and the outer annular wall 27 are located on the same circumference, and an annular outlet 18 is formed between the outer annular wall 27 and the vertical partition 25. A circumferential gap is provided between the inner annular wall 28 and the spiral baffle 14. The outer annular wall 27 acts as a barrier. It prevents the liquid film on the inner wall of the annular cavity 16 from directly flowing into the inner filter element 1, forcing the oil to flow along the spiral oil passage to the oil outlet 15. At the same time, it is also a component that forms a buffer distance. The outer annular wall 27 cooperates with the inner wall of the housing 5 or related structures to restrict the airflow channel.

[0045] like Figure 2-4As shown in Figure 7, an inner annular wall 28 is provided on the horizontal partition 9, located inside and concentric with the outer annular wall 27. A mounting groove is formed between the outer annular wall 27 and the inner annular wall 28, and the inner filter element 1 is disposed in the mounting groove. The annular air outlet wall 17 is embedded between the inner annular wall 28 and the inner circumferential surface of the inner filter element 1, and the inner annular wall 28 and the outer annular wall 27 cover the lower part of the annular air outlet wall 17 and the inner filter element 1. This further strengthens the installation strength of the inner filter element 1 and the annular air outlet wall 17, and also makes each structure detachable, which facilitates the replacement and cleaning of the inner filter element 1 and the annular air outlet wall 17.

[0046] Preferably, such as Figure 2 , 7 As shown, the inner annular wall 28 and the outer annular wall 27 are of the same height, and their height is one-third of that of the inner filter element 1. This one-third ratio is an optimized value obtained through experiments. If there is too little obstruction, it will not be able to force the airflow upward and prevent short circuits; if there is too much obstruction, it will result in an insufficient air intake area, excessively high local air velocity, increased wind resistance, and may even cause local overload of the filter element. Therefore, this optimized value finds a balance between ensuring sufficient airflow residence time and maintaining low air intake velocity and pressure drop, thus ensuring both pretreatment efficiency and protection of the filter element.

[0047] This invention provides an oil mist treatment device for industrial equipment. Specific examples are used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. An oil mist treatment device for industrial equipment, characterized in that: From bottom to top, it includes the main unit with an inner filter, the expansion body, and the outer filter; The main unit also includes a cylindrical housing, a motor, and an impeller; a mist inlet pipe is connected to the bottom center of the housing; The housing is provided with a horizontal partition wall, which divides the inner cavity of the housing into an upper region and a lower region. The motor is fixed in the upper region along the central axis of the housing, and the impeller is located in the lower region and connected to the output end of the lower end of the motor; The inner wall of the housing is provided with an upper spiral oil passage located in the upper region and a lower spiral oil passage located in the lower region. The upper spiral oil passage and the lower spiral oil passage have an L-shaped cross section to form a spiral baffle on the inner side. The upper and lower spiral oil passages have opposite spiral directions and converge at the junction of the two zones. The housing is provided with an oil outlet at the junction of the upper and lower spiral oil passages. The upper region is provided with an annular cavity, the inner side of the annular cavity is provided with an annular air outlet wall, the upper spiral oil passage is located in the annular cavity, and the bottom of the annular cavity is connected to the lower region; The inner side of the annular cavity near the horizontal partition wall is provided with an annular outlet, and the lower edge of the annular outlet has a buffer distance with the horizontal partition wall. The inner filter element is annular and is disposed against the annular outlet, and both the top and bottom of the inner filter element are sealed; the inner side of the inner filter element is provided with the annular air outlet wall; The expansion body has an expansion cavity whose inner diameter gradually decreases from top to bottom, and the lower inner diameter of the expansion cavity is the same as the inner diameter of the housing; the outer filter element is disposed above the upper open expansion body.

2. The oil mist treatment device for industrial equipment according to claim 1, characterized in that: The cross-section of the expander is square, and the expander includes a funnel portion and a vertical portion. The inner cavity of the funnel portion forms the expander cavity, and the outer filter element is square and is fitted inside the inner cavity of the vertical portion.

3. The oil mist treatment device for industrial equipment according to claim 1, characterized in that: The housing is provided with partition walls connected in a horizontal folding manner. The partition walls include a first horizontal partition wall, a vertical partition wall, and a second horizontal partition wall. The inner filter element is located below the second upper partition wall. The horizontal partition wall has an outer annular wall at its outer edge. The vertical partition wall and the outer annular wall are located on the same circumference. The annular outlet is formed between the outer annular wall and the vertical partition wall. A circumferential gap is provided between the inner annular wall and the spiral baffle wall.

4. The oil mist treatment device for industrial equipment according to claim 1, characterized in that: The horizontal partition wall is provided with an inner annular wall located inside the outer annular wall and concentric with it; an installation groove is formed between the outer annular wall and the inner annular wall, and the inner filter element is disposed in the installation groove.

5. The oil mist treatment device for industrial equipment according to claim 4, characterized in that: The annular air outlet wall is embedded between the inner annular wall and the inner circumferential surface of the inner filter element, and the inner and outer annular walls block the lower part of the annular air outlet wall and the inner filter element.

6. The oil mist treatment device for industrial equipment according to claim 5, characterized in that: The inner and outer annular walls are of equal height, and their height is one-third of that of the inner filter element.

7. The oil mist treatment device for industrial equipment according to claim 1, characterized in that: The oil outlet is provided with an oil outlet pipe, which is arranged tangentially along the shell.

8. The oil mist treatment device for industrial equipment according to claim 1, characterized in that: A filter screen is provided at the point where the mist inlet pipe enters the housing.

9. An oil mist treatment device for industrial equipment according to claim 1, characterized in that: The external filter element is a glass fiber filter.

10. An oil mist treatment device for industrial equipment according to claim 1, characterized in that: The outer filter element consists of multiple arrayed and horizontally stacked vertical filter plates, which are wavy, forming wavy filter channels between adjacent vertical filter plates.

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