A non-powered and efficient oil fume purification and treatment equipment

Abstract

The present invention discloses a non-powered and efficient oil fume purification treatment device in the field of oil fume purification, comprising a support frame and an oil fume treatment cylinder, the oil fume treatment cylinder being fixedly connected to the top of the support frame, an oil-water separation box being provided at the bottom of the support frame, three partitions being evenly fixed in the middle of the oil-water separation box, one of the partitions being fixedly connected to a cover plate above the oil-water separation box, a bottom guide pipe being provided at the bottom of the oil fume treatment cylinder penetrating the support frame and the cover plate, and a groove being provided on the partition in the middle of the oil-water separation box. The provision of a check pipe 5-10 cm above the bottom of the delivery pipe in the present invention can prevent the oil fume inside the delivery pipe from flowing back when the machine is shut down, causing water mist to flow back into the equipment and causing equipment erosion, thereby protecting the equipment. Secondly, the oil fume purification treatment operation can be achieved without the use of power equipment throughout the entire process, which is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to the field of unpowered oil fume purification, in particular to unpowered and efficient oil fume purification processing equipment. Background Art

[0002] Oil fume purification refers to the treatment of oil fume exhaust gas. In some industrial processing occasions, oil fume purifiers are mainly used for oil fume purification in plastic processing workshops, oil splash heat treatment workshops, oil mist lubrication workshops, workpiece welding workshops, and olefin oil boiler emissions.

[0003] However, existing large-scale oil fume purifiers require significant power and energy consumption, resulting in low efficiency, high noise levels, frequent and difficult cleaning, a high risk of fire, a short lifespan, high malfunction rates, and susceptibility to damage. When the equipment is shut down, water mist in the pipes can flow back into the equipment, causing short circuits and corrosion damage. Therefore, those skilled in the art have provided a non-powered, highly efficient oil fume purification device to address the problems identified in the background art. Summary of the Invention

[0004] The purpose of the present invention is to provide a non-powered and efficient oil fume purification and treatment device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The top of the oil fume purifier is connected with the oil fume treatment cylinder, and an oil-water separation box is arranged at the bottom of the oil fume treatment cylinder, and three partitions are evenly fixed in the middle of the oil-water separation box, one of which is fixedly connected to a cover plate above the oil-water separation box, and a bottom guide pipe is arranged at the bottom of the oil fume treatment cylinder, which passes through the support frame and the cover plate. A groove is provided on the partition in the middle of the oil-water separation box, and a semicircular baffle is fixedly connected to one side of the baffle, and a gap of 5-10 cm is formed between the semicircular baffle and the bottom of the oil-water separation box. A drainage pipe 1 communicating with the inside of the oil-water separation box is fixedly connected to a side wall of the bottom of the oil-water separation box, and a water outlet pipe 1 is fixedly connected to the upper side of the drainage pipe 1. An oil outlet pipe 1 is fixedly connected to the upper side wall adjacent to the oil-water separation box and the drainage pipe 1, and corresponding valves are fixedly connected to the oil outlet pipe 1 and the drainage pipe 1.

[0007] Preferably, a top guide pipe is provided on the top of the oil fume treatment cylinder, and a mixed cooling flue gas liquefaction elbow provided inside the oil fume treatment cylinder is connected between the top guide pipe and the bottom guide pipe. The mixed cooling flue gas liquefaction elbow is classified into three structures, such as Figure 7-9As shown, there are S-shaped pipe, spiral coil and spiral square pipe structures respectively.

[0008] Preferably, a water inlet pipe is provided above the side wall of one side of the oil fume treatment cylinder, a diversion pipe connected to the top guide pipe is connected above the water inlet pipe through a tee, a drain pipe 2 is provided at the bottom of the water inlet pipe, and a return pipe is provided on the side wall of the oil fume treatment cylinder opposite to the water inlet pipe.

[0009] Preferably, the return pipe and the water inlet pipe are welded to the oil fume treatment cylinder and are connected to the oil fume treatment cylinder, and the water inlet pipe, the second drain pipe and the return pipe are all provided with stop valves.

[0010] Preferably, the top guide tube is an inverted U-shaped structure, the bottom of the top guide tube is connected to a solid particle separation tube through a flange, the bottom of the solid particle separation tube is connected to a bottom cover through a flange, and there is a stop valve at the bottom to release the separated particulate matter and water, and the solid particle separation tube and the oil fume treatment cylinder are fixedly installed through a support seat.

[0011] Preferably, a buffer bend is connected to one side wall of the solid particle separation tube through a flange, a delivery pipe is connected to the buffer bend through an elbow, the other end of the delivery pipe is connected to a top smoke exhaust pipe through an elbow, a smoke exhaust hood is provided below the top smoke exhaust pipe, and the delivery pipe includes a cooling cavity formed on the wall of the delivery pipe, a cooling water inlet pipe fixed to the lower side of the delivery pipe, and a cooling water outlet pipe fixed to the upper side of the delivery pipe.

[0012] Preferably, a cover body is connected to one side wall of the smoke hood via a hinge, and the cover body and the smoke hood are connected via the locking assembly, which includes a screw with a rotating wheel and a pressing block with a slot in the middle.

[0013] Preferably, a V-shaped angle iron is welded to the smoke hood below the cover body, a bottom oil drain pipe is fixedly connected to a corner below the smoke hood, an inclined baffle is provided in the middle of the smoke hood, the baffle forms an angle of 30 degrees with the horizontal direction, and a guide groove plate is fixedly connected to the inner wall of the smoke hood below the baffle.

[0014] Preferably, a middle oil drain pipe is fixedly connected to the four walls of the smoke hood on one side of the guide trough plate, a top drain pipe is welded to the bottom of the side wall of the smoke pipe, and a stop valve is provided on the top drain pipe and the middle oil drain pipe.

[0015] Preferably, a check pipe is welded on the top of the smoke hood and extends into the inside of the elbow connecting the top smoke extraction pipe and the delivery pipe. The check pipe is 5-10 cm higher than the bottom of the delivery pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the flue gas's own pressure to collect the flue gas through the smoke hood, then pass it through the conveying pipe, and then through the buffer pipe to the solid particle separation pipe for separation and filtration. The flue gas then enters the oil fume treatment cylinder, where it is mixed with water, cooled, and liquefied to form an oil-water mixture. The entire process does not require the use of power equipment to achieve oil fume purification and treatment operations, with high efficiency, energy saving, and environmental protection. The oil-water mixture is separated in the oil-water separation box and reaches an automatic oil-water separation state.

[0018] 2. The baffle in the smoke hood of the present invention can prevent large particles and impurities in the smoke from entering the pipeline and subsequent equipment, reducing the number of cleaning times of the delivery pipe;

[0019] 3. The setting of the check pipe 5-10 cm above the bottom of the delivery pipe in the present invention can prevent the oil smoke inside the delivery pipe from flowing back during shutdown, which causes water mist to flow back into the equipment and cause equipment corrosion, thereby playing a role in protecting the equipment;

[0020] 4. The oil smoke of the present invention can separate the particulate matter and oil stains in the oil smoke through the buffer elbow and solid-liquid particle separation, reducing the particulate matter and oil stains from entering the mixed cooling flue gas liquefaction elbow, reducing the failure rate of the equipment, increasing the service life, and improving the processing efficiency;

[0021] 5. The present invention can transport water to the interior of the mixed cooling flue gas liquefaction bend through a diverter pipe, and mix it with the oil smoke inside the mixed cooling flue gas liquefaction bend. The oil smoke and water are mixed and circulated through a multi-layered circulation pipe that curves and spirals from top to bottom, and then the oil smoke is cooled from the inside. After flushing, mixing, atomizing, cooling, and high-efficiency treatment, it is liquefied into an oil-water mixture. At this time, the flue gas is cleaned, and the treated oil-water mixture flows from the bottom guide pipe into the oil-water separation box for oil-water separation. The cooling water inside the oil smoke treatment cylinder and located outside the mixed cooling flue gas liquefaction bend can achieve cooling of the outside of the mixed cooling flue gas liquefaction bend, which can greatly improve the cooling efficiency of the oil smoke.

[0022] 6. The present invention can utilize the characteristics that water and oil are insoluble and the density of water is greater than that of oil, so that the oil inside the oil-water separation box floats to the top, and then enters the remaining cavities inside the oil-water separation box in turn after being blocked and filtered step by step by the semicircular baffles on one side of the partition, thereby realizing the separation operation of oil and water. The oil outlet pipe 2 can discharge the separated oil to the outside, and the drain pipe 1 can discharge the water inside the oil-water separation box to the outside, thereby achieving the operation of separating oil and water after the oil fume purification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 A cross-sectional view of the smoke hood of the present invention;

[0025] Figure 3 Schematic diagram of the connection between the diverter pipe and the top guide pipe in the present invention;

[0026] Figure 4 It is a cross-sectional view of the oil fume treatment cylinder of the present invention;

[0027] Figure 5 It is a cross-sectional view of the oil-water separation box of the present invention;

[0028] Figure 6 is a cross-sectional view of the delivery pipe of the present invention;

[0029] Figure 7 This is a structural diagram of the S-shaped mixed cooling flue gas liquefaction elbow in the present invention;

[0030] Figure 8 This is a structural diagram of the spiral mixing cooling flue gas liquefaction elbow in the present invention;

[0031] Figure 9 This is a structural diagram of the spiral square tube type mixed cooling flue gas liquefaction elbow in the present invention.

[0032] Figure: 1, support frame; 2, oil-water separation box; 3, partition; 4, semicircular shielding plate; 5, water outlet pipe 1; 6, drain pipe 1; 7, oil outlet pipe 1; 8, trough; 9, cover plate; 10, oil fume treatment cylinder; 11, bottom guide pipe; 12, drain pipe 2; 13, water inlet pipe; 14, return pipe; 15, diversion pipe; 16, top guide pipe; 17, solid particle separation pipe; 18, support base; 19, buffer Bend pipe; 20. Delivery pipe; 2001. Cooling water inlet pipe; 2002. Cooling water outlet pipe; 2003. Cooling chamber; 21. Top smoke exhaust pipe; 22. Smoke exhaust hood; 23. Cover; 24. Locking assembly; 25. V-shaped angle iron; 26. Bottom oil drain pipe; 27. Middle oil drain pipe; 28. Top drain pipe; 29. ​​Check pipe; 30. Baffle; 31. Mixed cooling flue gas liquefaction bend pipe; 32. Guide trough plate. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1 to 9In the embodiment of the present invention, a non-powered and efficient oil fume purification and treatment equipment comprises a support frame 1 and an oil fume treatment cylinder 10. The top of the support frame 1 is fixedly connected to the oil fume treatment cylinder 10. An oil-water separation box 2 is provided at the bottom of the support frame 1. Three partitions 3 are evenly fixed in the middle of the oil-water separation box 2. One of the partitions 3 is fixedly connected to a cover plate 9 above the oil-water separation box 2. A bottom guide pipe 11 is provided at the bottom of the oil fume treatment cylinder 10, which passes through the support frame 1 and the cover plate 9. A groove 8 is provided on the partition 3 in the middle of the oil-water separation box 2. A semicircular shielding plate 4 is fixedly connected to one side of the partition 3. There is a gap of 5-10 cm between the semicircular shielding plate 4 and the bottom of the oil-water separation box 2. The oil-water separation box 2 A drain pipe connected to the inside of the oil-water separation box 2 is fixedly connected to one side wall of the bottom, a water outlet pipe 5 is fixedly connected to one side above the drain pipe, an oil outlet pipe 7 is fixedly connected to the upper side wall of the oil-water separation box 2 adjacent to the drain pipe, and corresponding valves are fixedly connected to the oil outlet pipe 7 and the drain pipe. The characteristics that water and oil are insoluble and the density of water is greater than the density of oil can be utilized to make the oil inside the oil-water separation box 2 float to the top, and then enter the remaining cavities inside the oil-water separation box 2 in turn after being blocked and filtered by the semicircular baffle 4 on one side of the partition 3, thereby realizing the separation operation of oil and water. The oil outlet pipe 7 can discharge the separated oil to the outside, and the water outlet pipe 5 discharges the water after oil and water separation to the outside.

[0035] Among them, the top of the oil fume treatment cylinder 10 is provided with a top guide pipe 16, and the top guide pipe 16 and the bottom guide pipe 11 are connected to the mixing cooling flue gas liquefaction elbow 31 arranged inside the oil fume treatment cylinder 10. The mixing cooling flue gas liquefaction elbow 31 is classified into three structures, such as Figure 7-9 As shown, they are S-shaped pipe, spiral coil and spiral square pipe structures respectively. A water inlet pipe 13 is set above the side wall of the oil fume treatment cylinder 10. The top of the water inlet pipe 13 is connected to the top guide pipe 16 through a tee. A connected diversion pipe 15 is provided, and a drainage pipe 12 is provided at the bottom of the water inlet pipe 13. A return pipe 14 is provided on the side wall of the oil fume treatment cylinder 10 opposite to the water inlet pipe 13. The water inlet pipe 13 can be connected to the external cooling water pipe delivery pipe 20, and the water outlet pipe can be connected to the external cooling water recovery pipeline. The cooling water source can be transported to the inside of the mixed cooling flue gas liquefaction bend 31 through the diversion pipe 15, mixed with the oil fume inside the mixed cooling flue gas liquefaction bend 31, and cooled from the inside. The mixed oil and water flow from the bottom guide pipe 11 into the oil-water separation box 2 for oil-water separation. The cooling water inside the oil fume treatment cylinder 10 located on the periphery of the mixed cooling flue gas liquefaction bend 31 can achieve cooling of the outside of the mixed cooling flue gas liquefaction bend 31, which can greatly improve the cooling efficiency of the oil fume.

[0036] Among them, the return pipe 14 and the water inlet pipe 13 are welded to the oil fume treatment cylinder 10 and are connected to the oil fume treatment cylinder 10. The water inlet pipe 13, the drain pipe 12 and the return pipe 14 are all provided with stop valves.

[0037] Among them, the top guide pipe 16 is an inverted U-shaped structure, and the bottom of the top guide pipe 16 is connected to the solid particle separation pipe 17 through a flange, and the bottom of the solid particle separation pipe 17 is connected to the bottom cover through a flange, and there is a stop valve at the bottom to release the separated particulate matter and water. The solid particle separation pipe 17 and the oil fume treatment cylinder 10 are fixedly installed through the support seat 18. The buffer elbow can play a role in slowing down the oil fume, and can make the solid particles in the oil fume sink to the bottom of the solid particle separation pipe 17, and the solid particles can be removed by opening the bottom cover.

[0038] Among them, a buffer elbow 19 is connected to the one side wall of the solid particle separation tube 17 through a flange, and a delivery pipe 20 is connected to the buffer elbow 19 through an elbow. The other end of the delivery pipe 20 is connected to the top smoke exhaust pipe 21 through an elbow. A smoke hood 22 is provided below the top smoke exhaust pipe 21. The delivery pipe 20 includes a cooling cavity 203 formed on the wall of the delivery pipe 20, a cooling water inlet pipe 2001 fixed on the lower side of the delivery pipe 20, and a cooling water outlet pipe 2002 fixed on the upper side of the delivery pipe 20. The delivery pipe 20 is used to transport oil smoke. The cooling water inlet pipe 2001 and the cooling water outlet pipe 2002 are connected to the external cooling water delivery and collection pipeline, which can transport cooling water to the inside of the cooling cavity 2003 to pre-cool the oil smoke passing through the delivery pipe 20.

[0039] Among them, a cover body 23 is connected to one side wall of the smoke hood 22 through a hinge, and the cover body 23 and the smoke hood 22 are connected through a locking assembly 24. The locking assembly 24 includes a screw with a rotating wheel and a clamping block with a slot in the middle. The locking assembly 24 can be used to quickly install and fix the cover body 23 and the smoke hood 22.

[0040] Among them, a V-shaped angle iron 25 is welded to the smoke hood 22 below the cover body 23, and a bottom oil drain pipe 26 is fixedly connected to a corner below the smoke hood 22. An inclined baffle 30 is provided in the middle of the smoke hood 22, and the baffle 30 forms an angle of 30 degrees with the horizontal direction. A guide groove plate 32 is fixedly connected to the inner wall of the smoke hood 22 below the baffle 30. The V-shaped angle iron 25 can facilitate the collection of filtered oil inside the smoke hood 22.

[0041] Among them, a middle oil drain pipe 27 is fixedly connected to one side of the guide groove plate 32 on the four walls of the smoke hood 22, and a top drain pipe 28 is welded to the bottom of the side wall of the smoke pipe 21. Both the top drain pipe 28 and the middle oil drain pipe 27 are provided with a stop valve. The guide groove plate 32 can guide the oil blocked inside the smoke hood 22 and discharge it to the outside through the middle oil drain pipe 27.

[0042] Among them, a check pipe 29 is welded on the top of the smoke hood 22 and extends into the inside of the elbow connecting the top smoke pipe 21 and the delivery pipe 20. The check pipe 29 is 5-10 cm higher than the bottom of the delivery pipe 20. The setting of the check pipe 29 can prevent the oil smoke inside the delivery pipe 20 from flowing back when the machine is shut down, causing water mist to flow back into the equipment, causing equipment erosion, and playing a role in protecting the equipment.

[0043] The working principle of the present invention is: when this high-efficiency oil fume processing device is in use, the smoke hood 22 is fixed above the industrial equipment, and the oil fume enters the inside of the smoke hood 22. Under the action of the baffle 30, it can play a role of blocking the flow. The guide groove plate 32 can guide the oil blocked inside the smoke hood 22 to be discharged to the outside from the middle oil discharge pipe 27. The oil fume enters the inside of the delivery pipe 20 from the check pipe 29. The check pipe 29 is 5-10 cm higher than the bottom of the delivery pipe 20. It can avoid the oil fume inside the delivery pipe 20 from flowing back when the machine is stopped, causing water mist to flow back into the equipment, causing equipment erosion, and playing a role of protecting the equipment. The oil fume inside the delivery pipe 20 After the buffering deceleration of the buffer bend 19, the solid particles in the oil smoke can be sunk to the bottom of the solid particle separation tube 17, and the solid particles can be removed by opening the bottom cover. Then, the pure oil smoke enters the mixed cooling flue gas liquefaction bend 31 under the guidance of the top guide pipe 16. The water inlet pipe 13 is connected to the external cooling water pipe delivery pipe 20, and the return pipe 14 is connected to the external cooling water recovery pipe. The cooling water source can be transported to the inside of the mixed cooling flue gas liquefaction bend 31 through the diversion pipe 15 to mix with the oil smoke inside the mixed cooling flue gas liquefaction bend 31. The oil smoke and water are mixed and circulated through the multi-level circulation pipes that bend and spiral from top to bottom, and then the oil smoke is purified from the inside. After cooling, flushing, mixing, atomizing, cooling, and high-efficiency treatment, it is liquefied into an oil-water mixture. At this time, the flue gas is cleaned, and the treated oil-water mixture flows from the bottom guide pipe into the oil-water separation box 2 for oil-water separation. The cooling water inside the oil fume treatment cylinder 10, which is located outside the mixed cooling flue gas liquefaction bend, can achieve cooling of the outside of the mixed cooling flue gas liquefaction bend, which can greatly improve the cooling efficiency of the oil fume. The oil fume is cooled from the inside, and the mixed oil and water flow from the bottom guide pipe 11 into the oil-water separation box 2 for oil-water separation. The cooling water inside the oil fume treatment cylinder 10, which is located outside the mixed cooling flue gas liquefaction bend 31, can achieve cooling of the mixed cooling flue gas liquefaction. The cooling outside of the bend 31 can greatly improve the cooling efficiency of the oil fume. The characteristics of water and oil being insoluble and the density of water being greater than that of oil can be utilized to make the oil inside the oil-water separation box 2 float to the top, and then pass through the step-by-step blocking and filtration of the semicircular baffle 4 on one side of the partition 3, and then enter the remaining cavities inside the oil-water separation box 2 in turn, realizing the separation operation of oil and water. The oil outlet pipe 7 can discharge the separated oil to the outside, the water outlet pipe 5 can discharge the water after the oil and water separation to the outside, and the drain pipe 6 can discharge the water inside the oil-water separation box 2 to the outside, so as to achieve the operation of purifying the oil fume. The oil fume purification operation can be achieved without using any power equipment throughout the process, which is energy-saving and environmentally friendly.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention. For example, the oil fume is mixed and circulated inside the pipe through pipe bends of various materials and shapes and water, and the outside of the circulating pipe is water-cooled to achieve oil fume purification and the use of this principle to achieve the purification purpose should all be covered within the protection scope of the present invention.

Claims

1. A non-powered and efficient oil fume purification and treatment device, comprising a support frame (1) and an oil fume treatment cylinder (10), characterized in that: The top of the support frame (1) is fixedly connected to the oil fume treatment cylinder (10), the bottom of the support frame (1) is provided with an oil-water separation box (2), three partitions (3) are evenly fixed in the middle of the oil-water separation box (2), one of the partitions (3) is fixedly connected to the top of the oil-water separation box (2) with a cover plate (9), the bottom of the oil fume treatment cylinder (10) is provided with a bottom guide pipe (11) that passes through the support frame (1) and the cover plate (9), the partition (3) in the middle of the oil-water separation box (2) is provided with a groove (8), one side of the partition (3) A semicircular baffle (4) is fixedly connected, and a gap of 5-10 cm is provided between the semicircular baffle (4) and the bottom of the oil-water separation box (2). A drainage pipe (6) communicating with the inside of the oil-water separation box (2) is fixedly connected to one side wall of the bottom of the oil-water separation box (2). A water outlet pipe (5) is fixedly connected to one side above the drainage pipe (6). An oil outlet pipe (7) is fixedly connected to one side wall of the oil-water separation box (2) adjacent to the drainage pipe (6). Corresponding valves are fixedly connected to both the oil outlet pipe (7) and the drainage pipe (6). A top guide pipe (16) is provided on the top of the oil fume treatment cylinder (10), and the top guide pipe (16) is an inverted U-shaped structure, and its bottom is connected to a solid particle separation pipe (17) through a flange, and a side wall of the solid particle separation pipe (17) is connected to a buffer elbow (19) through a flange, and the buffer elbow (19) is connected to a delivery pipe (20) through an elbow, and the other end of the delivery pipe (20) is connected to a top smoke extraction pipe (21) through an elbow, and a smoke hood (22) is provided below the top smoke extraction pipe (21), and a check pipe (29) is welded on the top of the smoke hood (22) and extends into the inside of the elbow connecting the top smoke extraction pipe (21) and the delivery pipe (20), and the check pipe (29) is 5-10 cm higher than the bottom of the delivery pipe (20); A mixed cooling flue gas liquefaction bend (31) arranged inside the oil fume treatment cylinder (10) is connected between the top guide pipe (16) and the bottom guide pipe (11), and the mixed cooling flue gas liquefaction bend (31) is an S-shaped pipe, a spiral coil or a spiral square pipe structure; the delivery pipe (20) includes a cooling cavity (2003) formed on the pipe wall, a cooling water inlet pipe (2001) fixed on the lower side, and a cooling water outlet pipe (2002) fixed on the upper side.

2. The oil fume non-powered and efficient purification equipment according to claim 1 is characterized in that: A water inlet pipe (13) is provided above the side wall of one side of the oil fume treatment cylinder (10); a diversion pipe (15) connected to the top guide pipe (16) is connected above the water inlet pipe (13) through a tee; a second drain pipe (12) is provided at the bottom of the water inlet pipe (13); a return pipe (14) is provided on the side wall of the oil fume treatment cylinder (10) opposite to the water inlet pipe (13); and a stop valve is provided on the water inlet pipe (13), the second drain pipe (12) and the return pipe (14).

3. The oil fume non-powered high-efficiency purification equipment according to claim 1 is characterized in that: An inclined baffle (30) with an angle of 30 degrees to the horizontal direction is provided in the middle of the smoke hood (22); a guide trough plate (32) is fixedly connected to the inner wall below the baffle plate (30); a middle oil drain pipe (27) is fixedly connected to one side of the guide trough plate (32) on the surrounding walls; and a bottom oil drain pipe (26) is fixedly connected to a lower corner.

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