Wet-type film forming structure and wet-type fire-retardant smoke hood all-in-one machine with wet-type film forming structure

Abstract

The utility model discloses a wet-type film forming structure and a wet-type fire-retardant smoke hood all-in-one machine with the same. The wet-type film forming structure comprises a pore plate assembly and a water circulation device for conveying water to the pore plate assembly, the pore plate assembly comprises a lower pore plate and an upper pore plate, and lampblack sequentially penetrates through the lower pore plate and the upper pore plate; the water circulation device continuously conveys water to the lower pore plate and forms a water film on the lower pore plate, the thickness of the water film is set to be 8-12 mm, and the flow speed of the oil fume penetrating through the lower pore plate is 8-12 m / s; saturated oil fume gas is in contact with the upper pore plate for cooling and water removal after being in contact with the water film of the lower pore plate for cooling and filtering, the lower pore plate and the upper pore plate are arranged, so that the oil fume purification effect is better, and meanwhile, the water circulation device is arranged to convey water to the lower pore plate and form the water film, so that the oil fume can be in contact with water all the time, and the oil fume is cleaned and cooled.

Description

Technical Field

[0001] This utility model belongs to the field of integrated oil fume purification machines, and relates to a wet film-forming structure and an integrated wet flame-retardant fume hood having the same. Background Technology

[0002] A range hood integrated unit is a kitchen appliance that combines a range hood and oil fume purification. It is installed above the kitchen stove and can quickly remove the waste from the stove combustion and harmful oil fumes, odors, and particulate matter generated during cooking. After multi-stage purification, the waste is discharged outdoors.

[0003] When a range hood is used continuously for an extended period, the intense heat from the cooking fumes will cause the surface temperature of the exhaust duct to become excessively high. If the exhaust duct comes into contact with flammable materials and the surface temperature of the exhaust duct reaches the ignition point of the flammable materials, the flammable materials will be ignited, or a fire may occur during cooking. The fire will then enter the range hood along with the cooking fumes, causing damage to the range hood, leading to a fire, and threatening life and property safety. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a wet film-forming structure, comprising a perforated plate assembly and a water circulation device for supplying water to the perforated plate assembly. The perforated plate assembly includes a lower perforated plate for cooling and filtering oil fumes and an upper perforated plate for removing water from oil fumes. Oil fumes pass sequentially through the lower and upper perforated plates. The holes on the upper perforated plate are arranged in a corrugated pattern, and the upper perforated plate is provided with several corrugated plates, with adjacent corrugated plates having opposite bending directions. The water circulation device continuously supplies water to the lower perforated plate, forming a water film on the lower perforated plate. The thickness of the water film is set to 8-12 mm, and the flow velocity of the oil fumes passing through the lower perforated plate is 8 m / s-12 m / s. After contacting the water film on the lower perforated plate for cooling and filtration, the saturated oil fume gas contacts the upper perforated plate for cooling and water removal.

[0005] More specifically, the lower perforated plate has a number of ventilation holes, and the ventilation holes occupy 33% of the total area of ​​the lower perforated plate.

[0006] More specifically, the diameter of the ventilation hole is set to 3-10mm.

[0007] More specifically, the diameter of the ventilation hole is set to 4.2 mm.

[0008] More specifically, the thickness of the lower perforated plate is set to 0.5-5cm.

[0009] More specifically, the thickness of the lower perforated plate is set to 1 cm.

[0010] More specifically, an overflow pipe is led out from the water supply pipe, and part of the water entering the water supply pipe is discharged through the overflow pipe, while the other part is transported to the lower orifice plate.

[0011] More specifically, a low liquid level sensor and a high liquid level sensor are installed in the water storage tank.

[0012] More specifically, a water inlet is provided on the shell, and the water inlet is connected to the water storage tank.

[0013] More specifically, the water pipe is provided with spray holes, and a blocking component is provided above the water pipe. Water is sprayed from the spray holes toward the blocking component and drips down the orifice plate through the blocking component.

[0014] More specifically, the blocking component includes a first baffle and a second baffle connected together. Both the first baffle and the second baffle are inclined, and water drips from the two baffles down to the orifice plate.

[0015] A wet flame arrestor fume hood integrated machine includes a shell, a wet film-forming structure, and a purification module for purifying oil fumes. The wet film-forming structure is disposed inside the shell. The shell is provided with an air inlet and an air outlet. A fan is provided at the air outlet, and an air intake is provided at the air inlet of the shell.

[0016] More specifically, the purification module includes a wire mesh demister for water removal and filtration, an electric field component for purifying oil fumes, and a UV lamp for removing odors, arranged in sequence.

[0017] This utility model discloses a wet film-forming structure and an integrated wet fire-retardant fume hood, which can achieve the following technical effects: The lower and upper perforated plates allow for two-stage filtration of oil fumes, resulting in better purification. A water circulation device supplies water to the lower perforated plate, forming a water film that remains in a constant state, even after the oil fumes have passed through the lower perforated plate. Water does not flow downwards from the lower perforated plate, ensuring the oil fumes are always in contact with water, cleaning and cooling them, effectively improving the purification efficiency of the downstream oil fumes, and extending the cleaning and maintenance cycle. In case of fire, it can also extinguish the fire, ensuring effective fire suppression and safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 ;

[0020] Figure 3 This is a side view of the structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the water circulation device of this utility model and its cooperation with the upper and lower perforated plates;

[0022] Figure 5 This is a schematic diagram of the lower perforated plate structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the upper perforated plate structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the water supply pipe and the blocking component of this utility model.

[0025] In the diagram: 1. Shell; 11. Cyclone plate; 12. Air intake; 21. Lower perforated plate; 211. Ventilation hole; 22. Upper perforated plate; 31. Water storage tank; 32. Water supply pipe; 33. Spray hole; 34. First baffle; 35. Second baffle; 36. Water pump; 37. Overflow pipe; 38. Overflow port; 39. Water inlet; 5. Fan; 6. Electric field assembly. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this utility model. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 limiting the scope of protection of this utility model. The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0028] A wet film-forming structure includes a perforated plate assembly and a water circulation device for supplying water to the perforated plate assembly;

[0029] A wet flame arrestor fume hood integrated machine, such as Figure 1 , Figure 2As shown, the system includes a housing 1, a wet film-forming structure disposed within the housing 1, a purification module for purifying oil fumes, and a fan 5 for exhaust. The purification module includes a wire mesh demister for water removal and filtration, an electric field component 6 for purifying oil fumes, and a UV lamp for odor removal. The wire mesh demister is an SP wire mesh demister. The electric field component 6 includes a first-stage high-voltage electric field and two-stage low-voltage electric fields. An air inlet and an air outlet are provided on the housing 1. The fan 5 is located at the air outlet. A cyclone plate 11 is provided at the air inlet. Oil fumes in the space enter the housing 1 through the cyclone plate 11, are first filtered by a perforated plate assembly, then filtered by the wire mesh demister to remove water and particulate matter, then undergo three stages of filtration by the electric field component 6, and finally deodorized by the UV lamp before being discharged from the housing 1 by the fan 5. The multi-stage filtration by the perforated plate assembly, electric field component 6, etc., results in better oil fume purification.

[0030] like Figure 1 , Figure 2 as well as Figure 3 As shown, in order to ensure the collection of oil fumes, an air intake 12 is provided at the front end of the housing. Furthermore, the air intake 12 is located around the air inlet. The air intake 12 is provided to facilitate the collection of oil fumes and further adsorb the oil fumes that escape upward.

[0031] like Figure 3 , Figure 4 , Figure 5 as well as Figure 6 As shown, the perforated plate assembly includes a lower perforated plate 21 for cooling and filtering oil fumes and an upper perforated plate 22 for removing water from oil fumes. Oil fumes pass through the lower perforated plate 21 and the upper perforated plate 22 in sequence. There is a space between the upper perforated plate 22 and the lower perforated plate 21 to facilitate the installation of a water circulation device.

[0032] The lower perforated plate 21 includes a lower plate and a plurality of ventilation holes 211 formed on the lower plate. The ventilation holes 211 can be of the same size or different sizes. In this design, the ventilation holes 211 are of the same size. The plurality of ventilation holes 211 are evenly arranged on the lower plate, and the ventilation holes 211 occupy 33% of the lower plate. The diameter of each ventilation hole 211 is set to 3-10mm. The smaller the diameter of the ventilation hole 211, the easier it is to be blocked by oil fumes, and the more frequently it needs to be cleaned, but it is easier to clean. The larger the diameter of the ventilation hole 211, the less likely it is to be blocked, and the fewer times it needs to be cleaned, but the less convenient it is to clean. Therefore, in this design, the diameter of the ventilation hole 211 is set to 4.2mm, which can reduce the frequency of cleaning and ensure that cleaning is convenient.

[0033] If the pressure inside the housing 1 is too high, it will affect the air volume of the fan 5. To ensure the air volume, it is necessary to replace the fan 5 with one with a higher power, which will increase the cost. In this solution, the pressure used for the lower perforated plate 21 needs to be controlled at 100 Pa. Since the thickness of the lower perforated plate 21 will affect the pressure inside the housing 1, the thicker the lower perforated plate 21, the greater the pressure. In order to ensure the pressure inside the housing 1 while ensuring performance, the thickness of the lower perforated plate 21 is set to 0.5-5 cm. In this solution, the thickness of the lower perforated plate 21 is set to 1 cm.

[0034] like Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7 As shown, the water circulation device continuously supplies water to the lower orifice plate 21, forming a water film on it. This water film maintains its membrane state, ensuring that the water does not drip from the ventilation holes 211 after the oil fumes pass through. To maintain the water film's state, the air velocity through the ventilation holes 211 needs to be controlled between 8 m / s and 12 m / s, and the water film thickness needs to be maintained at 8-12 mm. More specifically, the water film thickness should be maintained at 10 mm, and the air velocity through the ventilation holes 211 needs to be controlled at 12 m / s. Oil fumes entering from the air inlet pass through the lower orifice plate 21 and come into contact with the water film on it, intercepting oil and some particulate matter. Simultaneously, the ventilation holes 211 on the lower plate also intercept large particles carried by the oil fumes. When the fumes pass through the lower perforated plate 21, a water film forms on it, causing the temperature of the lower perforated plate 21 to be significantly lower than that of the fumes. This allows for heat exchange between the plate and the fumes, lowering their temperature. If a fire breaks out in the space, the fire will enter the housing 1 along with the fumes. The presence of the water film will extinguish the fire on the fumes, preventing open flames from entering the integrated fume hood and causing damage or even a fire.

[0035] The formula for calculating liquid pressure is P = ρgh, where P is the pressure, ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the liquid. For water, the density ρ is approximately 1000 kg / m³. 3 The acceleration due to gravity g is approximately 9.8 m / s². 2 Therefore, at a pressure of 100 Pa, the corresponding water film height can be calculated using the formula to be approximately 10 mm.

[0036] On a plate of the same area, the same number of ventilation holes 211 are made. The larger the hole diameter, the greater the hole occupancy. Under the condition of using the same fan, the lower the air velocity inside the hole, the smaller the static pressure difference, and according to the liquid pressure formula, the smaller the water film thickness. The following data were obtained from the experiment:

[0037] Ventilation hole diameter (mm) Pore ​​ratio Wind speed inside the ventilation hole static pressure difference Water film thickness φ3.2 25％ 14.2m / s 130pa 14mm φ4.2 33％ 12m / s 100pa 10mm φ5.2 50.5％ 7.4m / s 35pa 4mm φ6.2 67.6％ 5.5m / s 20pa 3mm

[0038] As shown in the table, when the diameter of ventilation hole 211 is set to 5.2mm, the water film thickness is only 4mm, and when the diameter of ventilation hole 211 is set to 6.2mm, the water film thickness is only 3mm. Due to the manufacturing process of sheet metal parts, it is impossible to guarantee that the sheet metal surface is absolutely smooth. When the water film thickness is only 4mm or even 3mm, there may be some areas on the sheet metal parts where the water film cannot be formed, resulting in the inability to filter and clean the oil fumes. Therefore, ventilation hole 211 needs to be selected with a diameter of 4.2mm or 3.2mm. However, since the smaller the hole diameter, the greater the static pressure difference, the higher the requirements for the fan 5 will be, and the higher the cost will be. In order to meet the needs of most manufacturers, a hole diameter of 4.2mm is selected in this solution.

[0039] During the filtration of oil fumes, the oil on the fumes mixes with the water film and sticks to the lower perforated plate 21 over time, making it difficult to clean. Therefore, it is necessary to drain the water from the lower perforated plate 21 in real time. One side of the lower perforated plate 21 is set as the drainage side, and the water on the lower perforated plate 21 is discharged from the drainage side to the water circulation device.

[0040] like Figure 3 , Figure 4 , Figure 5 , Figure 6 as well as Figure 7As shown, the water circulation device includes a water storage tank 31, a water pump 36 installed in the water storage tank 31, and a water delivery pipe 32 connected to the water pump 36. The water pump 36 transports water from the water storage tank 31 to the water delivery pipe 32, and the water flows back to the water storage tank 31 through the lower orifice plate 21, circulating repeatedly. However, during the circulation process, the water film cleans and filters the oil fumes, causing the amount of oil in the water in the water storage tank 31 to gradually increase, sticking to the machine and affecting subsequent cleaning. Therefore, an overflow pipe 37 is provided. One end of the overflow pipe 37 is connected to the water supply pipe 32, and the other end is connected to the overflow port 38. The overflow port 38 is connected to an external drainage tank to treat the water containing oil. When the water in the storage tank flows through the water supply pipe 32, some water will flow to the overflow pipe 37 and eventually flow to the overflow port 38 to be discharged from the storage tank 31. During the drainage process, oil will be discharged at the same time, which can reduce the amount of oil in the storage tank 31. However, at the same time, the amount of water in the storage tank 31 will also decrease, affecting the formation of the water film. Therefore, a water inlet 39 is provided. The water inlet 39 is connected to an external water source to replenish water to the storage tank 31, preventing the amount of water in the storage tank 31 from being too low and affecting the formation of the water film. To better control the water volume in the water storage tank 31, a low-level sensor and a high-level sensor are installed in the water storage tank 31. When the low-level sensor does not detect water, the water inlet 39 starts to fill with water. When the high-level sensor detects water, the water inlet 39 stops filling with water. The positions of the low-level sensor and the high-level sensor are set according to the required water volume.

[0041] After the integrated fume hood is turned on, the water pump installed in the water storage tank 31 starts, supplying water to the water pipe 32. The water pipe 32 sprays water onto the lower orifice plate 21 to form a water film on the lower orifice plate 21. More specifically, the water pipe 32 is provided with spray holes 33. The water in the water pipe 32 is sprayed onto the lower orifice plate 21 through the spray holes 33. The spray holes 33 can be set directly towards the lower orifice plate 21 to spray water directly onto the lower orifice plate 21, or they can be set to face other directions. A blocking element is set in the direction of water spraying, so that water flows from the blocking element to the lower orifice plate 21. The water spray hole 33 is directly opened towards the lower orifice plate 21, which can reduce the number of components. However, if the water is sprayed directly towards the lower orifice plate 21, the water impact will prevent the formation of a water film on the lower orifice plate 21. Therefore, in this solution, the water spray hole 33 is set towards the upper orifice plate 22, and a blocking element is set in the direction of water flow. Water is sprayed from the water spray hole 33 towards the blocking element and drips down the lower orifice plate 21 through the blocking element, forming a water film on the lower orifice plate 21.

[0042] like Figure 3 , Figure 4 as well as Figure 7As shown, the blocking component can be any part capable of blocking water while allowing it to flow down to the lower orifice plate 21. In this embodiment, the blocking component includes a first baffle 34 and a second baffle 35 connected together. Both the first baffle 34 and the second baffle 35 are inclined. Water is sprayed from the spray hole 33 onto the first baffle 34 and the second baffle 35, and then drips from the two baffles down to the lower orifice plate 21, forming a water film on the lower orifice plate 21. The angle between the first baffle 34 and the second baffle 35 is set to be greater than or equal to 30° and less than or equal to 120°, preferably 90°. The arrangement of the first baffle 34 and the second baffle 35 must ensure that the water sprayed from the spray hole 33 does not flow up to the upper orifice plate 22, while the water flows down to the lower orifice plate 21.

[0043] The water supply pipe 32 is positioned above the lower perforated plate 21 and along its length, covering the entire length of the lower perforated plate 21. The water supply pipe 32 can be positioned on the side away from the air inlet or in the middle of the width of the lower perforated plate 21, as long as water covers the entire lower perforated plate 21 and forms a water film on it. The drainage trough is positioned along the length of the lower perforated plate 21. As water continuously flows down the lower perforated plate 21 and forms a water film, it also continuously flows towards the water storage tank 31. The water used for cleaning oil fumes is discharged through the overflow pipe 37. The drainage tank is connected to the overflow port 38, and the wastewater in the water storage tank 31 is directly discharged into the drainage tank for unified disposal. The spray holes 33 are evenly distributed on the water supply pipe 32, ensuring that the water sprayed from the spray holes 33 covers the entire lower perforated plate 21.

[0044] The water supply speed of the water pipe 32 to the orifice plate 21 needs to ensure that one-third of the water in the water storage tank 31 is drained within one hour to prevent oil stains from sticking and to facilitate cleaning and maintenance.

[0045] like Figure 3 , Figure 4 as well as Figure 6As shown, the oil fumes filtered and cooled at the lower perforated plate 21 flow to the upper perforated plate 22. Since the oil fumes flowing from the upper perforated plate 22 pass through the SP wire mesh filter and are then discharged to the electric field component 6, water ingress into the electric field component 6 will affect the purification efficiency. Furthermore, the oil fumes may be wetted at the lower perforated plate 21. Therefore, a water removal operation is required at the upper perforated plate 22. Although the SP wire mesh filter is also installed to remove water from the oil fumes, an upper perforated plate 22 is added to prevent the water from being completely removed by the first-stage water removal system. The upper perforated plate 22 has several layers from top to bottom, each layer having a continuous corrugated plate. The bending direction of each corrugated plate is consistent, but the corrugated plates of adjacent layers are arranged in different directions. Furthermore, the two adjacent corrugated plates bend in opposite directions, and the holes formed on the upper perforated plate 22 are corrugated, with a multi-channel arrangement, resulting in superior filtration of oil fumes and water vapor. This allows for more uniform flow, reduces cleaning frequency, provides high-temperature resistance, extends service life, and allows for repeated cleaning and reuse. It also has low wind resistance and good fire resistance. Setting the two adjacent corrugated plates in opposite bending directions increases airflow turbulence, and the more complex paths of the corrugated plates in different directions prolongs the residence time of oil fumes, improves purification efficiency, disperses oil fume particles, avoids local accumulation, reduces the risk of blockage, and extends equipment life. At the same time, it can better cope with changes in oil fume concentration and airflow speed, maintaining a stable purification effect.

[0046] The fume purification process of the integrated fume hood is as follows:

[0047] When the integrated fume hood is started, the water pump is turned on, causing the water in the water storage tank 31 to flow to the water supply pipe 32, and then through the spray hole 33 to the first baffle 34 and the second baffle 35. The water then flows through the first baffle 34 and the second baffle 35 to the lower perforated plate 21 until a water film is formed on the lower perforated plate 21. The oil fumes in the space enter the interior of the housing 1 through the cyclone plate 11, and the oil fumes escaping upwards are re-absorbed by the air intake 12. They first pass through the lower perforated plate 21, and then through the ventilation hole 211 to filter out large particles on the oil fumes. Then, they pass through the water film to filter out the oil and cool down the oil fumes. If the oil fumes carry flames, the water film can also extinguish the flames to prevent fires. The fumes then flow to the upper perforated plate 22, which filters the water vapor carried by the fumes and then filters the particulate matter again before flowing to the SP wire mesh filter. The SP wire mesh filter filters the water and particulate matter on the fumes. Then, the electric field component 6 performs three-stage filtration. After deodorization by the UV lamp, the purified fumes are discharged from the housing 1 by the fan 5. During the drainage process from the overflow pipe 37, if the low liquid level sensor does not detect water, water is added to the water storage tank 31 through the water inlet until the high liquid level sensor detects water. At this point, the water supply stops to ensure continuous water flow and prevent excessive fumes from carrying on the water film, which would affect cleaning.

[0048] This utility model discloses a wet film-forming structure and an integrated wet fire-retardant fume hood, which can achieve the following technical effects: The lower perforated plate 21 and upper perforated plate 22 allow for two-stage filtration of the oil fumes, resulting in better purification. Simultaneously, a water circulation device supplies water to the lower perforated plate 21, forming a water film. This water film remains in a water film state even after the oil fumes pass through the lower perforated plate 21, preventing water from flowing downwards. This ensures the oil fumes are always in contact with water, effectively cleaning them. Furthermore, if the oil fumes carry flames, they can be extinguished, guaranteeing both fire suppression effectiveness and safety.

[0049] The water circulation device continuously supplies water to the lower orifice plate 21, the water inlet 39 replenishes water to the water storage tank 31, and the overflow pipe 37 drains water to the outside of the shell 1, ensuring that the water on the lower orifice plate 21 flows in real time and will not stick to the lower orifice plate 21 due to excessive contact with oil fumes, making it difficult to clean.

[0050] A blocking element is provided to receive the water flowing out of the water spray hole 33, so that the water can flow gently down the orifice plate 21 and ensure that a water film can be formed on the lower orifice plate 21.

[0051] The upper perforated plate has 22 channels, which provides better filtration of oil fumes and water vapor, more uniform flow, reduces cleaning frequency, is resistant to high temperatures, has a longer service life, can be repeatedly cleaned and reused, and has low wind resistance and good fire resistance.

[0052] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0054] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A wet film-forming structure, characterized in that: The device includes a perforated plate assembly and a water circulation device for supplying water to the perforated plate assembly. The perforated plate assembly includes a lower perforated plate (21) for cooling and filtering oil fumes and an upper perforated plate (22) for removing water from oil fumes. Oil fumes pass through the lower perforated plate (21) and the upper perforated plate (22) in sequence. The holes on the upper perforated plate (22) are arranged in a wave-like bend. The upper perforated plate (22) is provided with several wave plates. The bending directions of two adjacent wave plates are opposite. The water circulation device continuously supplies water to the lower perforated plate (21) and forms a water film on the lower perforated plate (21). The thickness of the water film is set to 8-12 mm. The flow velocity of oil fumes passing through the lower perforated plate (21) is 8 m / s-12 m / s. After contact with the water film of the lower perforated plate (21) for cooling and filtration, the saturated oil fume gas contacts the upper perforated plate (22) for cooling and water removal.

2. The wet film-forming structure according to claim 1, characterized in that: The lower perforated plate (21) includes a lower plate and a plurality of ventilation holes (211) formed on the lower plate, wherein the ventilation holes (211) occupy 33% of the lower plate.

3. The wet film-forming structure according to claim 2, characterized in that: The diameter of the ventilation hole (211) is set to 3-10 mm.

4. The wet film-forming structure according to claim 3, characterized in that: The diameter of the ventilation hole (211) is set to 4.2 mm.

5. The wet film-forming structure according to claim 1, characterized in that: The water circulation device includes a water storage tank (31), a water pump (36) installed in the water storage tank (31), and a water delivery pipe (32) connected to the water pump (36), which delivers water to the lower orifice plate (21).

6. The wet film-forming structure according to claim 5, characterized in that: An overflow pipe (37) is led out from the water supply pipe (32). A portion of the water entering the water supply pipe (32) is discharged through the overflow pipe (37), and the other portion is transported to the lower orifice plate (21).

7. The wet film-forming structure according to claim 5, characterized in that: A low liquid level sensor and a high liquid level sensor are installed in the water storage tank (31).

8. The wet film-forming structure according to claim 5, characterized in that: The water circulation device also includes a water inlet (39), which is connected to the water storage tank (31).

9. The wet film-forming structure according to claim 5, characterized in that: The water supply pipe (32) is provided with a water spray hole (33). A blocking element is provided in the direction of water flow from the water spray hole (33). Water is sprayed from the water spray hole (33) toward the blocking element and drips onto the lower orifice plate (21) through the blocking element.

10. The wet film-forming structure according to claim 9, characterized in that: The blocking member includes a first baffle (34) and a second baffle (35) connected together, both of which are inclined.

11. A wet-type flame-retardant fume hood integrated machine, characterized in that: It includes a housing (1), a wet film-forming structure as described in any one of claims 1-10, and a purification module for purifying oil fumes. The wet film-forming structure is disposed inside the housing (1). The housing (1) is provided with an air inlet and an air outlet. A fan (5) is provided at the air outlet, and an air intake (12) is provided at the air inlet of the housing (1).

12. The integrated wet flame arrestor fume hood as described in claim 11, characterized in that: The purification module includes a wire mesh demister for water removal and filtration, an electric field component (6) for purifying oil fumes, and a UV lamp for removing odors, arranged in sequence.

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