A high-efficiency automatic exhaust gas removal device for paint production

Abstract

The present invention discloses a highly efficient automatic exhaust gas removal device for paint production, specifically relates to the field of paint processing equipment, including a fixed platform and a plurality of paint production tanks fixedly mounted on the fixed platform, a two-way exhaust duct is provided inside the front end of the fixed platform and an air inlet duct is provided inside the rear end, two bellows arranged front and back are provided on the top of the fixed platform, an exhaust gas treatment mechanism is provided on one side of the bottom of the fixed platform, and an air inlet duct and an exhaust duct are provided on the top of the exhaust gas treatment mechanism. The present invention combines the air inlet duct, the two-way exhaust duct, the exhaust gas treatment mechanism and the fixed platform to draw in and filter the leaked exhaust gas in the space during the paint production process and the exhaust gas generated by the paint production tank 2, and finally forms two upper and lower U-shaped air curtains to be discharged from the front side of the production space, and the blown air curtain and the air curtain formed by the air inlet duct form a closed space to prevent the exhaust gas leaked from the paint production tank or the exhaust gas generated during the discharge from being dispersed into the air.

Description

Technical Field

[0001] The present invention relates to the technical field of paint processing equipment, and more specifically, to a high-efficiency automatic exhaust gas removal device for paint production. Background Art

[0002] A large amount of waste gas is generated during paint production, which contains a large amount of volatile organic compounds, mainly including benzene, toluene, xylene and methyl ethyl ketone, which are extremely harmful to the human body and even have the risk of cancer. Some waste gas is also reproductive toxic, which can cause damage to the genetic material of organisms and may be accumulated through inheritance, affecting future generations.

[0003] However, most of the exhaust systems in the prior art paint production workshops use exhaust fans to remove exhaust gas, which cannot effectively remove toxic substances and particulate impurities in the exhaust gas, causing huge pollution to the environment, and have poor exhaust gas treatment effects and poor practicality.

[0004] The patent with patent application publication number CN 208081437 U discloses a high-efficiency automatic exhaust gas removal device for paint production. By providing an automatic exhaust gas removal device, the high-efficiency automatic exhaust gas removal device for equipment paint production can effectively remove the exhaust gas generated by the equipment during the paint production process, reduce the pollution of toxic substances and particulate impurities in the exhaust gas to the environment, and has high working efficiency and strong practicality.

[0005] However, the above technical solution still has many disadvantages in actual application. For example, the cleaning effect is not good only by using water spray to settle the particles and toxic substances in the exhaust gas and then using activated carbon to adsorb the toxic gas. In addition, the odor of the toxic gas floating in the air cannot be removed well, so its use is limited. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a high-efficiency automatic exhaust gas removal device for paint production. By utilizing an air inlet duct, a two-way exhaust duct, an exhaust gas treatment mechanism and a fixed platform, the leaked exhaust gas in the space during the paint production process and the exhaust gas generated by the paint production tank 2 are sucked in and filtered, and finally two upper and lower U-shaped air curtains are formed and discharged through the front side of the production space. The blown air curtain and the air curtain formed by the air inlet duct form a closed space, which prevents the exhaust gas leaking from the paint production tank or the exhaust gas generated during discharge from being dissipated into the air.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a highly efficient automatic exhaust gas removal device for paint production, comprising a fixed platform and a plurality of paint production tanks fixedly mounted on the fixed platform, a two-way exhaust duct is provided inside the front end of the fixed platform and an air inlet duct is provided inside the rear end, two bellows arranged front and back are provided on the top of the fixed platform, an exhaust gas treatment mechanism is provided on one side of the bottom of the fixed platform, an air inlet duct and an exhaust duct are provided on the top of the exhaust gas treatment mechanism, fans are connected to the air inlet duct and the exhaust duct respectively, and the two fans work in opposite directions, the air inlet duct is connected to the air inlet duct through the bellows on the rear side of the fixed platform, and the exhaust duct is connected to the two-way exhaust duct through the bellows on the front side of the fixed platform;

[0008] The waste gas treatment mechanism includes a box body, and a water tank, an air intake tank and an exhaust tank are arranged inside the box body. The air intake tank and the exhaust tank are arranged at the bottom of the water tank and correspond to two bellows respectively. The exhaust port of the paint production tank is connected with the air intake tank through a pipeline. The air intake tank and the exhaust tank are both movably connected with a filtering mechanism. The filtering mechanism includes a drawer, and the bottom of the drawer is arranged as a mesh structure. A winding shaft is arranged on one side of the drawer and an unwinding shaft is arranged on the other side. A filtering layer is connected between the winding shaft and the unwinding shaft.

[0009] In a preferred embodiment, the two-way exhaust duct includes an upper exhaust duct and a lower exhaust duct, a partition is provided between the upper exhaust duct and the lower exhaust duct, the upper exhaust duct and the lower exhaust duct are connected to the bellows through a three-way pipe, and a solenoid valve is provided on the pipe connecting the three-way pipe to the upper exhaust duct and the lower exhaust duct.

[0010] In a preferred embodiment, a plurality of blowing nozzles are embedded at the top and bottom of the two-way exhaust duct and the top of the air inlet duct. The cross-section of the two-way exhaust duct is set to be U-shaped, and both ends are connected to the end of the air inlet duct but are not connected.

[0011] In a preferred embodiment, a plurality of filter screens are provided inside the water tank, and the plurality of filter screens are arranged sequentially from bottom to top, and the filter screen holes thereon decrease sequentially from bottom to top.

[0012] In a preferred embodiment, a sealed box is fixedly provided on the outer side wall of the box body corresponding to the drawer, a sealing plate is provided between the sealed box and the box body, an opening is provided at the top of the sealing plate for connecting the sealed box and the box body, and the sealing plate is fixedly connected to the box body.

[0013] In a preferred embodiment, a socket is provided at the rear end of the drawer, the socket corresponds to the sealing plate and is movably connected to the sealing plate, a handle is fixedly provided on the front end surface of the drawer, and a sealing ring is fixedly provided on the outer wall of the front end of the drawer.

[0014] In a preferred embodiment, a servo motor is fixedly provided at the front end of the unwinding shaft and the rewinding shaft and a bearing is fixedly provided at the rear end. Sliders are fixedly provided at the front end of the servo motor and the rear end of the bearing. A slot is provided on the inner wall of the drawer corresponding to the slide.

[0015] In a preferred embodiment, the filter layer is wound on a unwinding shaft, and two ends are respectively bonded to the unwinding shaft and the winding shaft, the unwinding shaft is arranged in a sealed box, and the filter layer is specifically an activated carbon fiber cloth.

[0016] In a preferred embodiment, the top of the air intake bin is connected to a bellows located on one side of the air intake duct, and the top of the exhaust bin is connected to a bellows located on one side of the two-way exhaust duct. The bottoms of the air intake bin and the exhaust bin are both provided with intermediate connecting covers, and the intermediate connecting covers are fixedly connected to the box body. The intermediate connecting covers are arranged in a funnel shape, and the bottom end of the intermediate connecting cover at the bottom of the air intake bin is arranged at the bottom of the water bin, and the bottom end of the intermediate connecting cover at the bottom of the exhaust bin is arranged above the water bin.

[0017] Technical effects and advantages of the present invention:

[0018] 1. The present invention utilizes the fans on the air intake duct and the air exhaust duct to extract and transport the waste gas generated by the paint production tank above the fixed platform to the air intake bin, and then filter the waste gas through the photocatalyst liquid in the water bin. The filtered gas enters the exhaust bin and is finally transported to the two-way exhaust duct through the exhaust duct. The wind is divided into two paths through the two-way exhaust duct and blown out through the top and bottom of the front end of the fixed platform respectively, forming a two-way U-shaped wind curtain to isolate the waste gas leaked from the inner paint production tank to prevent it from being discharged into the working environment. The blown wind curtain and the wind curtain formed by the air intake duct form a closed space to prevent the waste gas leaked from the paint production tank or the waste gas generated during the discharge from being dispersed into the air.

[0019] 2. By using the reel and unreel shaft to drive the filter layer to reel in and out, when the filtering effect of the filter layer in the drawer deteriorates, the unreel shaft can be controlled to unreel a new filter layer and the reel shaft can be controlled to reel in the old filter layer, thereby realizing the continuous use of the filter layer. When the filter layer on the unreel shaft is completely used up, the drawer can be pulled out, and the reel and unreel shaft can be taken out by sliding the sliding feet and the slots, and then the filter layer can be removed and replaced with a new filter layer, which is very convenient to use;

[0020] 3. The present invention utilizes activated carbon fiber cloth and photocatalyst liquid to treat waste gas, thereby achieving three-stage filtration of waste gas and achieving better filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the overall appearance diagram of the present invention.

[0022] Figure 2 It is a top view of the fixing platform of the present invention.

[0023] Figure 3 It is a cross-sectional view of the fixing platform of the present invention at the bellows.

[0024] Figure 4 It is a schematic diagram of air intake and exhaust of the fixed platform of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the waste gas treatment mechanism of the present invention.

[0026] Figure 6 It is a schematic diagram of the filtering mechanism structure of the present invention.

[0027] Figure 7 It is a cross-sectional view of a drawer of the present invention.

[0028] The accompanying drawings are marked as: 1 fixed table, 2 paint production tank, 3 two-way exhaust duct, 4 air inlet duct, 5 bellows, 6 exhaust gas treatment mechanism, 61 box, 62 water tank, 63 air inlet tank, 64 exhaust tank, 7 air inlet duct, 8 exhaust duct, 9 filtering mechanism, 91 drawer, 92 winding shaft, 93 unwinding shaft, 94 filtering layer, 10 three-way pipe, 11 blowing nozzle, 12 filter screen plate, 13 sealing box, 14 sealing plate, 15 opening, 16 socket, 17 slider, 18 slot, 19 intermediate connecting cover, 20 fan. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0030] according to Figure 1-7 A high-efficiency automatic exhaust gas removal device for paint production shown in the figure comprises a fixed platform 1 and a plurality of paint production tanks 2 fixedly mounted on the fixed platform 1, a two-way exhaust duct 3 is provided inside the front end of the fixed platform 1 and an air inlet duct 4 is provided inside the rear end, two bellows 5 arranged front and back are provided on the top of the fixed platform 1, an exhaust gas treatment mechanism 6 is provided on one side of the bottom of the fixed platform 1, an air inlet duct 7 and an exhaust duct 8 are provided on the top of the exhaust gas treatment mechanism 6, fans 20 are connected to the air inlet duct 7 and the exhaust duct 8 respectively, and the two fans 20 work in opposite directions, the air inlet duct 7 is connected to the air inlet duct 4 through the bellows 5 on the rear side of the fixed platform 1, and the exhaust duct 8 is connected to the two-way exhaust duct 3 through the bellows 5 on the front side of the fixed platform 1;

[0031] The two-way exhaust duct 3 includes an upper exhaust duct and a lower exhaust duct, a partition is provided between the upper exhaust duct and the lower exhaust duct, the upper exhaust duct and the lower exhaust duct are connected to the bellows 5 through a three-way pipe 10, and a solenoid valve is provided on the pipe connecting the three-way pipe 10 and the upper exhaust duct and the lower exhaust duct;

[0032] A plurality of blowing nozzles 11 are embedded at the top and bottom of the two-way exhaust duct 3 and the top of the air inlet duct 4. The cross section of the two-way exhaust duct 3 is set to be U-shaped, and the two ends are connected to the end of the air inlet duct 4, but not connected;

[0033] The specific implementation method is as follows: when multiple paint production tanks 2 are working, part of the gas generated inside will leak into the air, causing a pungent smell in the air and affecting people's health. At this time, the fan 20 is controlled to work, and the fan 20 on the air intake duct 7 draws external air into the exhaust gas treatment mechanism 6 through the air intake duct 7 and the air intake duct 4 for exhaust gas treatment. The treated and purified air is discharged into the two-way exhaust duct 3 through the exhaust duct 8. The wind forms two U-shaped wind curtains and is discharged through the front side of the fixed platform 1 and the top and bottom of both sides, isolating the entire processing space from the space outside the wind curtain, and preventing the smell of exhaust gas from spreading and affecting the air quality in other spaces. In addition, through the setting of the solenoid valve on the three-way pipe 10, the two-way exhaust duct 3 can be exhausted at the top or bottom separately. The top exhaust is suitable for the paint production process, and the bottom exhaust is suitable for the material unloading process.

[0034] like Figure 5 As shown, the exhaust gas treatment mechanism 6 includes a box body 61, and a water tank 62, an air intake tank 63 and an exhaust tank 64 are arranged inside the box body 61. The air intake tank 63 and the exhaust tank 64 are arranged at the bottom of the water tank 62, and correspond to the two wind boxes 5 respectively. The exhaust port of the paint production tank 2 is connected to the air intake tank 63 through a pipeline, and the air intake tank 63 and the exhaust tank 64 are both movably connected with a filtering mechanism 9;

[0035] The top of the air inlet bin 63 is connected to the bellows 5 located on one side of the air inlet duct 4, and the top of the exhaust bin 64 is connected to the bellows 5 located on one side of the two-way exhaust duct 3. The bottoms of the air inlet bin 63 and the exhaust bin 64 are both provided with an intermediate connecting cover 19, and the intermediate connecting cover 19 is fixedly connected to the box body 61. The intermediate connecting cover 19 is arranged in a funnel shape, and the bottom end of the intermediate connecting cover 19 at the bottom of the air inlet bin 63 is arranged at the bottom of the water bin 62, and the bottom end of the intermediate connecting cover 19 at the bottom of the exhaust bin 64 is arranged above the water bin 62;

[0036] A plurality of filter screens 12 are disposed inside the water tank 62 . The plurality of filter screens 12 are arranged sequentially from bottom to top, and the filter screen holes thereon decrease sequentially from bottom to top.

[0037] The specific implementation method is as follows: during the process of producing paint in the paint production tank 2, the waste gas generated is directly passed into the air intake bin 63 inside the waste gas treatment mechanism 6, and the external air extracted through the air inlet duct 4 is also transported to the air intake bin 63. At this time, the waste gas is preliminarily filtered by the filter mechanism 9 inside the air intake bin 63, and then enters the water bin 62 to generate a large number of bubbles. At this time, the bubbles are defoamed by multiple filter plates 12 respectively, and finally discharged to the top. Since photocatalyst liquid is added to the water bin 62, toxic substances in the waste gas can be adsorbed and particulate objects can be precipitated. The gas after filtering again enters the exhaust bin 64, and is filtered for the last time by the filter mechanism 9 in the exhaust bin 64 and is discharged to the two-way exhaust duct 3 through the exhaust pipe 8, and finally discharged. The entire filtering process is divided into three steps, and the filtering effect is better.

[0038] like Figure 5-7 As shown, the filtering mechanism 9 includes a drawer 91, the bottom of the drawer 91 is set as a mesh structure, a reeling shaft 92 is provided on one side of the drawer 91 and a reeling shaft 93 is provided on the other side, and a filtering layer 94 is connected between the reeling shaft 92 and the reeling shaft 93;

[0039] A sealed box 13 is fixedly provided on the outer side wall of the box body 61 corresponding to the drawer 91, a sealing plate 14 is provided between the sealed box 13 and the box body 61, an opening 15 is provided at the top of the sealing plate 14 for connecting the sealed box 13 and the box body 61, and the sealing plate 14 is fixedly connected to the box body 61;

[0040] The drawer 91 has a socket 16 at the rear end, which corresponds to the sealing plate 14 and is movably connected to the sealing plate 14. A handle is fixedly provided on the front end surface of the drawer 91, and a sealing ring is fixedly provided on the front outer wall of the drawer 91.

[0041] The unwinding shaft 93 and the rewinding shaft 92 are fixedly provided with a servo motor at the front end and a bearing at the rear end, and a slider 17 is fixedly provided at the front end of the servo motor and the rear end of the bearing. A slot 18 is provided on the inner wall of the drawer 91 corresponding to the slider 17;

[0042] The filter layer 94 is wound on the unwinding shaft 93 , and two ends thereof are respectively bonded to the unwinding shaft 93 and the reeling shaft 92 . The unwinding shaft 93 is disposed in the sealing box 13 . The filter layer 94 is specifically an activated carbon fiber cloth.

[0043] The specific implementation method is as follows: when the filter mechanism 9 is working, wind can enter the drawer 91 and be filtered through the filter layer 94. The filter layer 94 is specifically an activated carbon fiber cloth, which has a better adsorption effect. After the filter layer 94 has been used for a period of time, the filtering effect will deteriorate. At this time, the unwinding machine and the reeling machine can be controlled to work, thereby controlling the unwinding shaft 93 to unwind a new filter layer 94 and the reeling shaft 92 to rewind the old filter layer 94, so as to achieve continuous use of the filter layer 94. When the filter layer 94 on the unwinding shaft 93 is completely used up, the drawer 91 can be pulled out, and then the reeling shaft 92 and the unwinding shaft 93 can be taken out by sliding the sliding foot and the slot 18, and then the filter layer 94 can be removed and replaced with a new filter layer 94, which is very convenient to use.

[0044] Working principle of the present invention:

[0045] Refer to the instruction manual Figure 1-4 During paint production, the fan 20 works to draw external air into the exhaust gas treatment mechanism 6 through the air intake duct 7 and the air intake duct 4 for exhaust gas treatment. The treated and purified air is discharged into the two-way exhaust duct 3 through the exhaust duct 8. The wind forms two U-shaped air curtains and is discharged through the front side of the fixed platform 1 and the top and bottom of both sides, isolating the entire processing space from the space outside the air curtain, and preventing the exhaust gas smell from spreading and affecting the air quality in other spaces;

[0046] Refer to the instruction manual Figure 5 During the paint production process of the paint production tank 2, the waste gas generated is directly passed into the air inlet bin 63 inside the waste gas treatment mechanism 6. When the waste gas treatment mechanism 6 is working, the waste gas is initially filtered by the filter mechanism 9 inside the air inlet bin 63, and then enters the water tank 62. The photocatalyst liquid adsorbs the toxic substances in the waste gas and precipitates the granular objects. The filtered gas enters the exhaust bin 64, and is finally filtered by the filter mechanism 9 in the exhaust bin 64. After the last filtration, it is discharged through the two-way exhaust duct 3. The whole filtering process is divided into three steps, and the filtering effect is better.

[0047] Refer to the instruction manual Figure 5-7 After the filter layer 94 has been used for a period of time, the unwinding shaft 93 is controlled to unwind a new filter layer 94 and the reeling shaft 92 is controlled to reel in the old filter layer 94, so as to realize the continuous use of the filter layer 94. When the filter layer 94 on the unwinding shaft 93 is completely used up, the drawer 91 can be pulled out, and the reeling shaft 92 and the unwinding shaft 93 can be taken out by sliding the sliding foot and the slot 18, and then the filter layer 94 can be removed and replaced with a new filter layer 94.

[0048] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0049] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0050] Finally: 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 in the protection scope of the present invention.

Claims

1. A highly efficient automatic exhaust gas removal device for paint production, comprising a fixed platform (1) and a plurality of paint production tanks (2) fixedly mounted on the fixed platform (1), characterized in that: A bidirectional exhaust duct (3) is provided inside the front end of the fixed platform (1) and an air inlet duct (4) is provided inside the rear end; two front and rear air boxes (5) are provided on the top of the fixed platform (1); an exhaust gas treatment mechanism (6) is provided on one side of the bottom of the fixed platform (1); an air inlet duct (7) and an exhaust duct (8) are provided on the top of the exhaust gas treatment mechanism (6); fans (20) are connected to the air inlet duct (7) and the exhaust duct (8) respectively, and the two fans (20) work in opposite directions; the air inlet duct (7) is connected to the air inlet duct (4) through the air box (5) on the rear side of the fixed platform (1); the exhaust duct (8) is connected to the bidirectional exhaust duct (3) through the air box (5) on the front side of the fixed platform (1); the exhaust gas treatment mechanism (6) The invention comprises a box body (61), wherein a water tank (62), an air inlet tank (63) and an air exhaust tank (64) are arranged inside the box body (61), wherein the air inlet tank (63) and the air exhaust tank (64) are arranged on the top of the water tank (62) and correspond to two bellows (5) respectively, wherein the exhaust port of the paint production tank (2) is connected to the air inlet tank (63) via a pipeline, wherein the air inlet tank (63) and the air exhaust tank (64) are both movably connected to a filter mechanism (9), wherein the filter mechanism (9) comprises a drawer (91), wherein the bottom of the drawer (91) is arranged to have a mesh structure, wherein a reeling shaft (92) is arranged on one side of the drawer (91) and an unreeling shaft (93) is arranged on the other side, and a filter layer (94) is connected between the reeling shaft (92) and the unreeling shaft (93); The two-way exhaust duct (3) comprises an upper exhaust duct and a lower exhaust duct, a partition is provided between the upper exhaust duct and the lower exhaust duct, the upper exhaust duct and the lower exhaust duct are connected to the bellows (5) via a three-way pipe (10), and a solenoid valve is provided on the pipe connecting the three-way pipe (10) and the upper exhaust duct and the lower exhaust duct; A plurality of blowing nozzles (11) are embedded in the top and bottom of the two-way exhaust duct (3) and the top of the air inlet duct (4); the cross-section of the two-way exhaust duct (3) is arranged to be U-shaped, and the two ends are connected to the air inlet duct (4) end to end, but not connected.

2. The high-efficiency automatic exhaust gas removal device for paint production according to claim 1 is characterized in that: A plurality of filter screens (12) are arranged inside the water tank (62), and the plurality of filter screens (12) are arranged sequentially from bottom to top, and the filter screen holes thereon decrease sequentially from bottom to top.

3. The high-efficiency automatic exhaust gas removal device for paint production according to claim 1 is characterized in that: A sealed box (13) is fixedly provided on the outer side wall of the box body (61) corresponding to the drawer (91); a sealing plate (14) is provided between the sealed box (13) and the box body (61); an opening (15) is provided at the top end of the sealing plate (14) for connecting the sealed box (13) and the box body (61); and the sealing plate (14) is fixedly connected to the box body (61).

4. The high-efficiency automatic exhaust gas removal device for paint production according to claim 3 is characterized in that: The drawer (91) has a socket (16) at the rear end, the socket (16) corresponding to the sealing plate (14) and movably engaged with the sealing plate (14), a handle fixedly provided on the front end surface of the drawer (91), and a sealing ring fixedly provided on the front outer wall of the drawer (91).

5. The high-efficiency automatic exhaust gas removal device for paint production according to claim 1 is characterized in that: A servo motor is fixedly provided at the front end of the unwinding shaft (93) and the rewinding shaft (92), and a bearing is fixedly provided at the rear end. A slider (17) is fixedly provided at the front end of the servo motor and the rear end of the bearing. A slot (18) is provided on the inner wall of the drawer (91) corresponding to the slider (17).

6. The high-efficiency automatic exhaust gas removal device for paint production according to claim 1 is characterized in that: The filter layer (94) is wound on the unwinding shaft (93), and its two ends are respectively bonded to the unwinding shaft (93) and the reeling shaft (92). The unwinding shaft (93) is arranged in a sealed box (13). The filter layer (94) is specifically an activated carbon fiber cloth.

7. The high-efficiency automatic exhaust gas removal device for paint production according to claim 1 is characterized in that: The top of the air intake bin (63) is connected to a bellows (5) located on one side of the air intake duct (4), and the top of the air exhaust bin (64) is connected to a bellows (5) located on one side of the two-way air exhaust duct (3). The bottoms of the air intake bin (63) and the air exhaust bin (64) are both provided with an intermediate connecting cover (19), the intermediate connecting cover (19) being fixedly connected to the box body (61), the intermediate connecting cover (19) being arranged in a funnel shape, the bottom end of the intermediate connecting cover (19) at the bottom of the air intake bin (63) being arranged at the bottom of the water bin (62), and the bottom end of the intermediate connecting cover (19) at the bottom of the air exhaust bin (64) being arranged above the water bin (62).

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