Simple oil fume and dust purification box

Abstract

This invention relates to the field of environmental protection equipment technology, and in particular discloses a simple fume and dust purification box, including a first filter assembly and a second filter assembly. The first filter assembly includes an outer casing containing liquid, with an opening at the top and a drain pipe fixed to the lower side wall of the outer casing. An air inlet groove is machined at the top of the outer casing to facilitate the insertion of a flue gas inlet pipe. The second filter assembly includes an inner casing installed inside the outer casing, with several layers of detachable filter units arranged from bottom to top inside the inner casing. The advantages are: it combines liquid adsorption with multi-layer solid filtration; the liquid can be selected from different media such as clean water or alkaline solution depending on the type of flue gas, effectively adsorbing grease, water-soluble harmful substances, and larger particulate dust; the subsequent multi-layer filter units can further remove water vapor, fine particles, and odor components, achieving targeted treatment of various types of flue gas.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment technology, and in particular to a simple oil fume and dust purification box. Background Technology

[0002] Air pollution problems such as cooking fumes, construction dust, and industrial exhaust are common in daily life. For cooking fume treatment, current technologies mainly rely on the metal filters inside range hoods, which physically trap grease particles. However, these metal filters are ineffective at removing water-soluble odor components, fine dust particles, and gaseous pollutants from the fumes, leaving some pollutants remaining in the filtered gas. For dust pollution from construction sites, common methods include water spraying for dust suppression or using fiber filters. Water spraying has limited effectiveness in removing fine particles and consumes a large amount of water; fiber filters are prone to clogging during use, and cleaning them is cumbersome, usually requiring disassembly and repeated rinsing with special cleaning agents or high-pressure water guns, with filtration efficiency significantly decreasing after multiple cleanings. Both metal and fiber filters are expensive to manufacture and require time and effort to maintain, resulting in consistently high overall operating costs. Therefore, there is an urgent need for a low-cost fume filtration device that is simple in structure, easy to clean and maintain, and can simultaneously treat grease, dust, and odor components.

[0003] Application content

[0004] The present invention proposes a simple oil fume and dust purification box to solve the above problems.

[0005] The technical solution of this invention is implemented as follows:

[0006] A simple fume and dust purification box includes:

[0007] The first filter assembly includes an outer casing for holding liquid inside. The upper end of the outer casing is open, and a drain pipe is fixed on the lower side wall of the outer casing. The interior of the outer casing is divided into a processing chamber and an air inlet chamber by a partition. The air inlet chamber is located at the rear end of the processing chamber and its lower end is connected to the processing chamber. The upper end of the air inlet chamber is closed and has an air inlet groove that facilitates the insertion of the flue gas input pipe.

[0008] The second filter assembly includes an inner box that is detachably installed inside the outer box. The inner box has a cylindrical structure. A second sealing ring is provided at the contact point between the inner box and the outer box. Several layers of detachable filter units are arranged inside the inner box from bottom to top.

[0009] The outer casing contains a liquid for adsorbing impurities in the flue gas, and the second filter assembly can be removed entirely from the outer casing.

[0010] Furthermore, the edge of the air inlet groove is provided with a first sealing ring that matches the outer wall of the flue gas input pipe.

[0011] Furthermore, the processing chamber is equipped with several floating suction devices that float in the liquid. Each floating suction device includes a hollow sphere, and the hollow sphere is covered with a suction layer.

[0012] Furthermore, an injection pipe is provided on the upper side wall of the outer casing.

[0013] Furthermore, two fixing plates are symmetrically fixed on the rear wall of the outer casing.

[0014] Furthermore, a stirring device is provided at the bottom of the outer casing. The stirring device includes a rotating shaft rotatably mounted at the bottom of the outer casing. One end of the rotating shaft extending out of the inner cavity of the outer casing is connected to a drive mechanism. A stirring paddle is installed at the end of the rotating shaft inserted into the inner cavity of the outer casing. A support foot is fixed at the lower end of the outer casing.

[0015] Furthermore, a wall scraping device is provided inside the processing cavity of the outer casing. The wall scraping device includes a support plate fixed in the middle of the processing cavity. Horizontally arranged guide rails are fixed on the front and rear side walls of the processing cavity. Two movable scrapers with their ends slidably mounted on the guide rails are provided inside the processing cavity. The two movable scrapers are respectively distributed on both sides of the support plate. Rubber strips for scraping off stains from the side walls of the processing cavity are fixed on the side walls of the movable scrapers. One end of the movable scraper near the support plate is connected to the support plate as a whole by a spring. The other end of the movable scraper is fixed with a pull rope whose end extends to the outside of the outer casing.

[0016] Furthermore, a limiting clip is fixed on the inner and outer side walls of the outer casing to guide the position of the pull rope, and the hole on the side wall of the outer casing for installing the pull rope is higher than the internal liquid level and a rubber sealing ring is embedded in the hole.

[0017] Furthermore, the filtration unit includes a sponge filter layer and an activated carbon filter layer, which are arranged alternately, with the lower surfaces of the sponge filter layer and the activated carbon filter layer placed on a support mesh plate. The multiple support mesh plates are fixed to the inner wall of the inner box by screws.

[0018] Furthermore, the top of the inner box is detachably connected to a top cover that seals the upper end of the inner box, and the top cover is provided with an exhaust pipe.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0020] First, it adopts a combination of liquid adsorption and multi-layer solid filtration. The liquid can be selected from different media such as water or alkaline solution depending on the type of flue gas, effectively adsorbing grease, water-soluble harmful substances and larger particulate dust. The subsequent multi-layer filtration unit can further remove water vapor, fine particles and odor components, achieving targeted treatment of various types of flue gas.

[0021] Secondly, the inner chamber is slidably installed inside the outer chamber and can be quickly separated from the first filter component by pulling it upwards. This facilitates independent cleaning or replacement of the dirt deposited inside the outer chamber, the inner chamber, and its internal filter unit. The filter unit is detachably placed on the support mesh plate, allowing users to replace the sponge layer or activated carbon layer individually as needed, without the need for complete disposal. In addition, the wall scraping device inside the outer chamber can drive the movable scraper along the guide rail via a pull rope to mechanically remove dirt adhering to the side walls of the treatment chamber. Combined with the adsorption of scum on the liquid surface by the floating suction device, this significantly extends the liquid replacement cycle and reduces maintenance frequency and costs.

[0022] Third, the outer casing can be made of transparent material, which makes it easy to observe the degree of internal liquid contamination in real time and arrange maintenance in a timely manner, further improving the ease of use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is an isometric sectional view of the present invention;

[0025] Figure 2 This is a first perspective view of the present invention;

[0026] Figure 3 This is a second perspective view of the present invention;

[0027] Figure 4 This is a side sectional view of the present invention;

[0028] Figure 5 This is a schematic diagram of the floating vacuum cleaner structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the first filter component of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the second filter component of the present invention.

[0031] The annotations in the attached figures are explained as follows:

[0032] 100. First filter assembly; 101. Outer casing; 102. Fixing plate; 103. Floating suction device; 1031. Hollow sphere; 1032. Suction layer; 104. Stirring device; 105. Wall scraping device; 1051. Support plate; 1052. Guide rail; 1053. Movable scraper; 1054. Pull rope; 1055. Spring; 1056. Limiting clip; 1057. Rubber strip; 106. Support foot; 107. Liquid injection pipe; 108. Sewage discharge pipe; 109. Air inlet slot; 110. First sealing ring; 200. Second filter assembly; 201. Inner casing; 202. Second sealing ring; 203. First filter layer; 204. Second filter layer; 205. Third filter layer; 206. Fourth filter layer; 207. Support mesh plate; 208. Top cover; 209. Exhaust pipe. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1-7 As shown, a simple oil fume and dust purification box includes a first filter assembly 100 and a second filter assembly 200.

[0035] The main body of the first filter assembly 100 is an outer box 101 containing liquid. The outer box 101 is welded from a 3mm thick transparent polycarbonate (PC) sheet to facilitate observation of the contamination level of the liquid inside. The outer box 101 has a rectangular cubic structure, 600mm long, 400mm wide, and 800mm high, with its top completely open. A liquid injection pipe 107 with an inner diameter of 20mm and an outer diameter of 25mm is installed on the upper side wall of the outer box 101, 50mm from the upper edge. The liquid injection pipe 107 is connected to the inside of the box and is used to inject clean water or alkaline solution into the box. A drain pipe 108 with an inner diameter of 25mm and an outer diameter of 32mm is fixed on the lower side wall of the outer box 101, 30mm from the bottom. A ball valve is installed on the drain pipe 108 for discharging waste liquid.

[0036] The outer casing 101 is divided into a processing chamber and an air intake chamber by a vertically arranged partition. The partition is made of the same material as the casing and is 3mm thick. The air intake chamber is located at the rear end of the processing chamber. The lower end of the air intake chamber is connected to the processing chamber. The lower end of the partition is 40mm away from the bottom surface of the outer casing, forming a connection. The upper end of the air intake chamber is closed, and an air intake groove 109 with a diameter of 100mm is machined at the center of the closed end. The air intake groove 109 facilitates the insertion of the flue gas input pipe from top to bottom. A 3mm thick annular first sealing ring 110 is pasted on the inner edge of the air intake groove 109. The first sealing ring 110 is made of silicone rubber and has an inner diameter of 95mm. It forms an interference fit with the outer wall of the flue gas input pipe with a standard outer diameter of 95mm to achieve airtightness.

[0037] The outer casing 101 contains several floating suction devices 103 that float in the liquid. Each floating suction device 103 includes a hollow sphere 1031 with a diameter of 30 mm. The hollow sphere 1031 is molded from foamed polypropylene EPP material with a density of less than 0.1 g / cm³, which has good buoyancy. The hollow sphere 1031 is wrapped with a suction layer 1032, which is a 5 mm thick polyurethane oleophilic sponge. It is bonded to the surface of the sphere with a water-resistant adhesive and is used to absorb grease and scum on the liquid surface.

[0038] On the rear wall of the outer casing 101, i.e. the side wall where the air intake chamber is located, two fixing plates 102 are symmetrically fixed by welding or bolts. The fixing plates 102 are L-shaped stainless steel plates with a cross-sectional size of 100mm×60mm×3mm. At least two mounting holes with a diameter of 10mm are opened on them for fixing the entire device to the wall or bracket.

[0039] The main body of the second filter assembly 200 is an inner box 201 that is slidably installed inside the processing chamber of the outer box 101. The inner box 201 is a cylindrical structure with openings at the top and bottom, and is welded from 304 stainless steel plate with a thickness of 2mm. Its external dimensions are 550mm in length, 350mm in width, and 700mm in height. There is a 5mm gap between the inner box 201 and the inner wall of the processing chamber of the outer box 101. At the contact point between the outer wall of the inner box 201 and the inner wall of the outer box 101, an annular groove is provided around the outer wall of the inner box 201. A second sealing ring 202 is embedded in the groove. The second sealing ring 202 is a silicone O-ring with a cross-sectional diameter of 6mm, which is used to prevent unfiltered gas from short-circuiting through the gap between the two.

[0040] The inner chamber 201 has several layers of removable filter units arranged from bottom to top. Specifically, multiple layers of horizontally arranged support mesh plates 207 are fixed on the inner wall of the inner chamber 201 by screws using M4×8 stainless steel countersunk screws at 100mm intervals. The support mesh plates 207 are made of 304 stainless steel plate with a thickness of 1.5mm and are evenly distributed with round holes with a diameter of 3mm, with an opening rate of 50%. The vertical distance between two adjacent support mesh plates 207 is 100mm.

[0041] On the upper surface of each layer of support mesh 207, a filter unit is placed. The filter unit includes a sponge filter layer and an activated carbon filter layer, which are arranged alternately. That is, starting from the bottom layer, the first filter layer 203 is a sponge filter layer, the second filter layer 204 is an activated carbon filter layer, the third filter layer 205 is a sponge filter layer, the fourth filter layer 206 is an activated carbon filter layer, and so on, for a total of four layers. The sponge filter layer uses polyurethane filter sponge with a pore size of 30 PPI per inch and a thickness of 30 mm. It is cut into a shape that matches the cross-section of the inner cavity of the inner box 201 and placed on the support mesh 207. The activated carbon filter layer uses coconut shell activated carbon with a particle diameter of 2-3 mm, filled in a 25 mm thick mesh nylon bag. Each nylon bag is sized to match the cross-section of the inner cavity of the inner box 201 and is also placed on the support mesh 207.

[0042] In another preferred embodiment of the present invention, a stirring device 104 is provided at the center of the inner bottom of the outer casing 101. The stirring device 104 includes a vertically rotating shaft mounted on the bottom of the outer casing 101. The shaft has a diameter of 15mm and is made of 304 stainless steel. Its lower end passes through the bottom plate of the outer casing 101 and achieves dynamic sealing with the bottom plate through a mechanical seal assembly of model M37G-15 to prevent liquid leakage. The lower end of the shaft extending out of the inner cavity of the outer casing 101 is connected to a geared DC motor driven by an external power source, model ZWPD012012-24, rated voltage 24V, output speed 30rpm. A two-bladed propeller-type stirring paddle with a diameter of 150mm and made of 304 stainless steel is installed at the upper end of the shaft inserted into the inner cavity of the outer casing 101. The stirring device 104 is used to periodically stir the liquid to prevent impurities from accumulating and caking, and to improve the liquid adsorption efficiency.

[0043] In another preferred embodiment of the present invention, the rotating shaft of the stirring device 104 is driven by a hand crank. The hand crank is rotated to drive the rotating shaft to rotate, which in turn drives the stirring paddle to rotate. This means that no electricity is needed during the filtration process of the entire device, making it convenient for outdoor use.

[0044] A support foot 106 is fixed at each of the four corners of the lower end of the outer casing 101. The support foot 106 is a rubber cylinder with a height of 50mm and a diameter of 30mm, and has anti-slip patterns on the bottom, so that the device can be placed stably on the ground.

[0045] In another preferred embodiment of the present invention, a wall scraping device 105 is provided inside the processing cavity of the outer casing 101. The wall scraping device 105 includes a support plate 1051 that is vertically fixed in the middle of the processing cavity, i.e., in the center of the left and right direction. The support plate 1051 is a 304 stainless steel plate with a thickness of 5mm, a height of 550mm, and a width that is the same as the width of the processing cavity. On the front and rear side walls of the processing cavity, a horizontally arranged guide rail 1052 is fixed by countersunk screws. The guide rail 1052 is made of aluminum alloy profile with a trapezoidal cross section, has a length of 500mm, and is installed 250mm away from the lower edge of the outer casing 101.

[0046] Two movable scrapers 1053 are installed inside the processing chamber. The two movable scrapers 1053 are distributed on the left and right sides of the support plate 1051 respectively. The main body of the movable scraper 1053 is a 304 stainless steel plate with a thickness of 2mm and a height of 300mm. In order to reduce the movement resistance, the movable scraper 1053 is evenly distributed with screen holes with a diameter of 10mm and an opening rate of 40%-60%. The two ends of the movable scraper 1053 are provided with matching sliding grooves corresponding to the positions of the guide rail 1052, so that the movable scraper 1053 can move horizontally along the guide rail 1052.

[0047] Each movable scraper 1053 has a rubber strip 1057 fixed on each of its two sides near the front and rear side walls of the processing chamber. The rubber strip 1057 is made of oil- and water-resistant nitrile rubber (NBR), with a wedge-shaped cross section, a thickness that gradually changes from 3 mm at the root to 1 mm at the cutting edge, and a length of not less than 300 mm. It is fixed to the side of the movable scraper 1053 by stainless steel pressure strips and screws. The cutting edge of the rubber strip 1057 is in close contact with the side wall of the processing chamber, and scrapes off the dirt attached to the side wall when the movable scraper 1053 moves.

[0048] Each movable scraper 1053 is connected to the support plate 1051 at one end near the support plate 1051, i.e., the inner end, by a spring 1055. The spring 1055 is a stainless steel tension spring with a free length of 100mm and a spring constant of 5N / mm. Hanging rings are welded to both ends, which are hung on the hooks at the corresponding positions of the inner end of the movable scraper 1053 and the support plate 1051. The spring 1055 applies a pulling force to the movable scraper 1053 toward the support plate 1051, which facilitates the reset of the movable scraper 1053.

[0049] Each movable scraper 1053 has a pull rope 1054 fixed at the other end, i.e., the outer end. The pull rope 1054 is made of nylon-coated steel wire rope with a diameter of 3mm. One end is fixed to the center of the outer end of the movable scraper 1053 by a clamping bolt, and the other end extends horizontally and passes through the hole on the side wall of the outer casing 101 to the outside of the outer casing 101. A plastic pull ring is fixed at the end for easy manual operation. The hole on the side wall of the outer casing 101 is located 100mm above the highest liquid level inside, i.e., 50mm away from the upper edge of the outer casing. The hole has a diameter of 5mm and a silicone rubber sealing ring embedded in the hole. The inner diameter is 3.2mm and the outer diameter is 8mm. The pull rope 1054 passes through the sealing ring to achieve dynamic sealing and prevent gas leakage.

[0050] On the inner and outer side walls of the outer casing 101, near the hole of the pull rope 1054, at least one limiter 1056 is fixed. The limiter 1056 is an L-shaped stainless steel stamping part with a thickness of 2mm. A guide hole with a diameter of 3.5mm is opened on its horizontal arm. The pull rope 1054 passes through the guide hole to limit the movement direction of the pull rope 1054 and prevent it from rubbing against the edge of the casing and breaking.

[0051] In another preferred embodiment of the present invention, the top of the inner box 201 is detachably connected to an upper cover 208. The detachable connection is as follows: four circumferentially distributed latches are welded to the outer wall of the upper end of the inner box 201; the upper cover 208 is a 2mm thick stainless steel plate, and stainless steel latches are installed at corresponding positions on its edges; a 3mm thick silicone sealing gasket is also provided between the upper cover 208 and the upper surface of the inner box 201 to ensure sealing; an exhaust pipe 209 is welded to the center of the upper cover 208, the exhaust pipe 209 has an inner diameter of 50mm and a height of 100mm, and is used to lead the purified gas to the outside or the atmosphere.

[0052] The working principle of this invention is as follows: When in use, first select the fixing method according to the installation environment, and use bolts to fix the outer box 101 to the wall or bracket, or place it directly on the ground through the support feet 106.

[0053] Based on the composition and characteristics of the flue gas to be treated, select the appropriate filter liquid: if the flue gas has a high oil content (such as cooking fumes), inject alkaline solution into the outer chamber 101; if the flue gas is mainly dust-containing gas (such as construction dust), inject clean water into the outer chamber 101. The liquid level must completely cover the upper end of the movable scraper 1053 to ensure that the movable scraper 1053 can contact the liquid surface and agitate the liquid when it moves.

[0054] A fan is installed at one end of the flue gas inlet pipe and positioned at the source of the flue gas generation. The other end of the flue gas inlet pipe is passed from top to bottom through the air inlet groove 109 and inserted into the bottom of the outer casing 101. The first sealing ring 110 at the edge of the air inlet groove 109 forms a seal with the outer wall of the pipe to prevent flue gas leakage. After the fan is started, the flue gas is sent through the pipe into the liquid at the bottom of the outer casing 101. The flue gas rises in the liquid in the form of bubbles and comes into full contact with the liquid: impurities such as grease or dust are adsorbed or wetted and settled by the liquid, and some scum is adsorbed by the floating sludge suction device 103 (a hollow sphere 1031 wrapped with a sludge suction layer 1032) floating on the surface of the liquid.

[0055] The gas, after initial purification by the liquid, escapes from the liquid surface and enters the bottom of the inner chamber 201. The gas passes through the multi-layer filter unit on the support mesh plate 207 from bottom to top. Due to the staggered arrangement of the sponge filter layer and the activated carbon filter layer, the gas first passes through the sponge layer to intercept residual water droplets and fine particles, and then passes through the activated carbon layer to adsorb odors and residual organic matter. This process is repeated to achieve deep purification. Finally, the clean gas is discharged through the exhaust pipe 209 on the upper cover 208.

[0056] After a period of use, the operator can manually pull the pull ropes 1054 on both sides of the outer casing 101, causing the movable scraper 1053 to move horizontally along the guide rail 1052 within the processing chamber. The rubber strips 1057 on both sides of the movable scraper 1053 adhere tightly to the front and rear side walls of the processing chamber, scraping off the oil sludge or dust layer attached to the side walls. Simultaneously, the movement of the movable scraper 1053 also agitates the internal liquid, improving the liquid's adsorption efficiency for flue gas. After releasing the pull ropes 1054, the spring 1055 pulls the movable scraper 1053 back to its initial position near the support plate 1051. Furthermore, the stirring device 104 can be periodically activated, rotating the stirring paddle via the shaft to agitate the liquid, preventing impurities from rapidly settling and caking, and enhancing the liquid's adsorption capacity.

[0057] When the liquid inside the outer casing 101 is heavily contaminated, open the drain pipe 108 to discharge the waste liquid, and then inject fresh liquid through the injection pipe 107. When the filter unit is saturated, open the top cover 208, remove the inner casing 201 from the outer casing 101, remove the screws on the support mesh plate 207, replace the sponge filter layer and activated carbon filter layer in sequence, and then reassemble. At the same time, heavier impurities deposited at the bottom of the outer casing 101 can be manually cleaned, or the floating vacuum cleaner 103 can be removed for cleaning.

[0058] Components not described in detail in this article are existing technologies.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A simple oil fume and dust purification box, characterized in that: include: The first filter assembly (100) includes an outer casing (101) for holding liquid inside. The upper end of the outer casing (101) is open, and a drain pipe (108) is fixed on the lower side wall of the outer casing (101). The outer casing (101) is divided into a processing chamber and an air inlet chamber by a partition. The air inlet chamber is located at the rear end of the processing chamber and its lower end is connected to the processing chamber. The upper end of the air inlet chamber is closed and has an air inlet groove (109) for easy insertion of the flue gas input pipe. The second filter assembly (200) includes an inner box (201) detachably installed inside the outer box (101). The inner box (201) has a cylindrical structure. A second sealing ring (202) is provided at the contact point between the inner box (201) and the outer box (101). Several layers of detachable filter units are provided inside the inner box (201) from bottom to top. The outer casing (101) contains a liquid for adsorbing impurities in the flue gas, and the second filter assembly (200) can be removed from the outer casing (101) as a whole.

2. The simplified oil fume and dust purification box according to claim 1, characterized in that: The edge of the air inlet groove (109) is provided with a first sealing ring (110) that matches the outer wall of the flue gas input pipe.

3. The simplified fume and dust purification box according to claim 1, characterized in that: The processing chamber is equipped with several floating suction devices (103) that float in the liquid. Each floating suction device (103) includes a hollow sphere (1031) and is covered with a suction layer (1032).

4. The simplified oil fume and dust purification box according to claim 1, characterized in that: An injection pipe (107) is provided on the upper side wall of the outer casing (101), and two fixing plates (102) are symmetrically fixed on the rear wall of the outer casing (101).

5. A simple oil fume and dust purification box according to claim 1, characterized in that: A stirring device (104) is provided at the bottom of the outer casing (101). The stirring device (104) includes a rotating shaft rotatably installed at the bottom of the outer casing (101). One end of the rotating shaft extending out of the inner cavity of the outer casing (101) is connected to a driving mechanism. One end of the rotating shaft inserted into the inner cavity of the outer casing (101) is equipped with a stirring paddle. A support foot (106) is fixed at the lower end of the outer casing (101).

6. The simplified oil fume and dust purification box according to claim 1, characterized in that: The outer casing (101) is equipped with a wall scraping device (105) in the processing chamber. The wall scraping device (105) includes a support plate (1051) fixed in the middle of the processing chamber. Horizontally arranged guide rails (1052) are fixed on the front and rear side walls of the processing chamber. Two movable scrapers (1053) are installed in the processing chamber with their ends slidably mounted on the guide rails (1052). The two movable scrapers (1053) are respectively distributed on both sides of the support plate (1051). Rubber strips (1057) for scraping off stains on the side walls of the processing chamber are fixed on both sides of the movable scrapers (1053). One end of the movable scraper (1053) near the support plate (1051) is connected to the support plate (1051) as a whole by a spring (1055). The other end of the movable scraper (1053) is fixed with a pull rope (1054) whose end extends to the outside of the outer casing (101).

7. A simple oil fume and dust purification box according to claim 6, characterized in that: The outer casing (101) has a limiting card (1056) fixed on its inner and outer side walls to guide the position of the pull rope (1054). The hole on the side wall of the outer casing (101) for installing the pull rope (1054) is higher than the internal liquid level and a rubber sealing ring is embedded in the hole.

8. A simple oil fume and dust purification box according to claim 1, characterized in that: The filtration unit includes a sponge filter layer and an activated carbon filter layer, which are arranged alternately. The lower surfaces of the sponge filter layer and the activated carbon filter layer are placed on a support mesh plate (207). The multiple support mesh plates (207) are fixed to the inner wall of the inner box (201) by screws.

9. A simple oil fume and dust purification box according to claim 1, characterized in that: The top of the inner box (201) is detachably connected to a top cover (208) that seals the upper end of the inner box (201), and an exhaust pipe (209) is provided on the top cover (208).

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