Fresh air filtering device of air conditioner

Abstract

The invention relates to the technical field of air conditioners, in particular to an air conditioner fresh air filtering device which comprises a switching mechanism used for changing an air circulation channel, the switching mechanism comprises a double-shaft motor fixedly installed in a cavity, and an output shaft of the double-shaft motor is coaxially connected with a plurality of sections of lead screws; the surface of the multi-section lead screw is fixedly connected with a movable frame through a bearing, and a baffle is fixedly installed on the surface of the movable frame through a sliding block. The two sets of cleaning mechanisms are symmetrically arranged in the channel and used for cleaning the filter screen, each cleaning mechanism comprises a strip-shaped plate, and round rods are fixedly installed at the two ends of each strip-shaped plate. Through cooperative use of all parts, when the central air conditioner operates, the air flowing channel can be intermittently replaced, the filtering efficiency and high efficiency of air are guaranteed, the filter screen in the channel can be cleaned, and the service life of the filter screen is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, and in particular to a fresh air filtering device for an air conditioning. Background Art

[0002] Air conditioning, whose full name is air conditioner, is a household appliance or industrial equipment used to regulate indoor air temperature, humidity, cleanliness and air flow rate; it uses the principle of refrigerant circulation to absorb indoor heat and discharge it to the outside, thereby achieving the purpose of lowering indoor temperature; with the development of science and technology, air conditioners are divided into cabinet air conditioners, wall-mounted air conditioners, and central air conditioners, etc., and most of the existing air conditioners have fresh air function, and have the function of detecting carbon dioxide, formaldehyde and PM2.5.

[0003] During the use of existing central air conditioners, due to its single-channel design, all air flows must pass through the same channel. With long-term use, dust, particles and other pollutants in the air will gradually accumulate on the filter device, forming blockage, weakening the original purification effect of the filter device and reducing the quality of air entering the room. At the same time, the single-channel design requires the central air conditioner to be shut down when cleaning the filter device, reducing the continuity and efficiency of air filtration. Summary of the invention

[0004] The purpose of the present invention is to provide an air-conditioning fresh air filtering device to solve the problem in the prior art proposed in the above background technology that long-term use causes clogging of the filtering device, weakening the purification effect, and the single-channel design requires shutdown for cleaning, reducing the continuity and efficiency of air filtration.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air-conditioning fresh air filter device, comprising a filter body, and two groups of channels are opened inside the filter body, an air inlet connected to the channel is opened on one side of the filter body, and two groups of air outlets are symmetrically opened on the other side of the filter body, and the two groups of air outlets are respectively connected to the two groups of channels, and a filter net is fixedly installed on the inner wall of the air outlet, a cavity is opened inside the filter body, a guide groove is opened through the inner wall of the cavity, two groups of vertical grooves connected to the channel are symmetrically opened through the inner wall of the cavity, and the inner walls of the two groups of channels are both provided with vertical grooves away from each other, and the inner walls of the vertical grooves are symmetrically provided with multiple groups of grooves; And a conversion mechanism for changing the air circulation channel, the conversion mechanism includes a double-axis motor fixedly installed inside the cavity, the output shaft of the double-axis motor is coaxially connected to a multi-section screw rod, the surface of the multi-section screw rod is fixedly connected to a moving frame through a bearing, and the surface of the moving frame is fixedly installed with a baffle through a slider.

[0006] Furthermore, the ends of the multi-section screw rods that are away from each other are all provided with matching grooves, and the matching grooves are in a polygonal structure.

[0007] Furthermore, the baffle plate is slidably matched with the guide groove, and flexible sealing strips that can be stretched and contracted are fixedly installed on both sides of the baffle plate, and ends of the flexible sealing strips that are away from each other are fixedly installed on the inner wall of the guide groove.

[0008] Furthermore, it also includes two groups of cleaning mechanisms symmetrically arranged inside the channel and used for cleaning the filter screen, the cleaning mechanism includes a strip plate, two ends of the strip plate are fixedly installed with round rods, a circular groove is opened inside the round rod, a moving rod is slidably matched inside the circular groove, and one end of the moving rod is arranged inside the strip plate, an extrusion block is fixedly installed at one end of the moving rod, a matching block is slidably matched on one side of the extrusion block, a collision rod is fixedly installed at one end of the matching block, a notch is opened on the surface of the collision rod, a rack is fixedly installed on the inner wall of the notch, a gear is meshedly connected on the surface of the rack, a connecting rod is fixedly installed on one side of the gear, a flexible brush is fixedly installed on one end of the connecting rod, and the flexible brush is elastically connected to the surface of the strip plate through a torsion spring, one end of the round rod close to the cavity is movably connected with a telescopic rod, a rotating rod is fixedly installed on the end of the telescopic rod, and the rotating rod is rotatably installed on the inner wall of the cavity, and a matching head is fixedly installed on one end of the rotating rod.

[0009] Furthermore, the circular groove is communicated with the strip plate, and a through groove is penetrated through the inner wall of the circular groove.

[0010] Furthermore, the other end of the moving rod is elastically connected to the inner wall of the circular groove through a connecting spring, and two groups of protruding rods are symmetrically installed on the surface of the moving rod. The protruding rods penetrate the interior of the through groove and are arranged inside the groove, and the protruding rods and the groove are slidably matched.

[0011] Furthermore, two groups of limiting grooves are symmetrically formed on the surface of the collision rod, and limiting blocks are slidably matched inside the limiting grooves, and the limiting blocks are fixedly installed inside the filter body.

[0012] Furthermore, the bottom surfaces of the two groups of channels are provided with dust suction ports, and the dust suction ports are connected to the external negative pressure equipment.

[0013] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects: 1. The present invention provides the air outlet, the dual-axis motor, the baffle and other components that cooperate with each other. When the central air conditioner is in use, the dual-axis motor drives the multi-section screw to move and drives the baffle to move laterally, so that one of the two groups of channels originally arranged in parallel is blocked by the baffle, and the other group of channels becomes the current air circulation path, and starts to filter the air through the filter net arranged inside; as the central air conditioner continues to run, the filter net in the air channel responsible for filtering will gradually accumulate dust, resulting in a decrease in filtering efficiency. At this time, the dual-axis motor is controlled to rotate in the opposite direction, and the baffle is driven to move in the opposite direction by the multi-section screw rod, so that the current filtering channel is blocked and the other group of channels that were previously blocked are opened, so as to realize channel switching and ensure the continuity and high efficiency of air filtration.

[0014] 2. The present invention provides components that cooperate with each other, such as a moving rod, a collision rod and a matching head. When the channel switching is completed, the matching groove close to the blocked channel and the matching head form a stable plug-in state, and with the continuous rotation of the dual-axis motor, the round rod connected to the rotation will start to slide in the vertical groove through the telescopic rod. During the sliding of the round rod, the convex rod will intermittently squeeze and cooperate with the groove, so that the moving rod will drive the extrusion block to move toward the matching block and extrude it, thereby driving the collision rod to extend and hit the frame of the filter, thereby loosening and removing dust attached to the surface of the filter. During the movement of the collision rod, the flexible brush can swing back and forth on the surface of the filter through the cooperation of the rack and the gear, so as to brush off the dust and impurities remaining on the filter, further improving the cleaning effect and extending the service life of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure enlargement in the middle; Figure 4 for Figure 2 Schematic diagram of the plane structure; Figure 5 It is a schematic diagram of the conversion mechanism structure of the present invention; Figure 6 It is a schematic diagram of the cleaning mechanism structure of the present invention; Figure 7 for Figure 6 A magnified schematic diagram of the structure at B in the middle; Figure 8 It is a schematic cross-sectional view of a part of the structure of the cleaning mechanism of the present invention; Fig. 9 It is a schematic diagram of the cross-sectional structure of the collision rod of the present invention.

[0017] In the figure: 1. filter body; 101. air inlet; 102. air outlet; 103. cavity; 104. guide groove; 105. vertical groove; 106. groove; 2. filter screen; 3. conversion mechanism; 301. double-axis motor; 302. multi-section screw rod; 3021. matching groove; 303. moving frame; 304. baffle; 3041. flexible sealing strip; 4. cleaning mechanism; 401. strip plate; 402. Round rod; 4021, round groove; 4022, through groove; 403, moving rod; 404, convex rod; 405, extrusion block; 406, matching block; 407, collision rod; 4071, limit groove; 4072, limit block; 408, notch; 409, rack; 410, gear; 411, connecting rod; 412, flexible brush; 413, telescopic rod; 414, rotating rod; 415, matching head; 5, dust suction port. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Embodiment: An air conditioning fresh air filtering device, such as Figure 1-Figure 9 As shown, it includes a filter body 1, and two groups of channels are opened inside the filter body 1. By setting the two groups of channels, they can be used alternately to ensure the continuity and high efficiency of central air conditioning air filtration; an air inlet 101 connected to the channel is opened on one side of the filter body 1, so that external air can enter the inside of the filter body 1; two groups of air outlets 102 are symmetrically opened on the other side of the filter body 1, and the two groups of air outlets 102 are respectively connected to the two groups of channels, so that the filtered gas can be discharged; Among them, a filter screen 2 is fixedly installed on the inner wall of the air outlet 102, which can filter the air entering the filter body 1 from the outside; a cavity 103 is opened inside the filter body 1, and a guide groove 104 is opened through the inner wall of the cavity 103, and two groups of vertical grooves 105 connected with the channel are symmetrically opened through the inner wall of the cavity 103, and the inner walls of the two groups of channels far away from each other are both provided with vertical grooves 105, and the guide grooves 104 and the vertical grooves 105 are provided to guide and limit the movement; it is worth mentioning that a sealing member, such as a deformable rubber pad, is provided inside the vertical groove 105 opened through the inner wall of the cavity 103, which can play a sealing role and prevent air from entering the interior of the cavity 103; a plurality of groups of grooves 106 are symmetrically opened on the inner wall of the vertical groove 105, and a driving role can be played by setting the grooves 106.

[0021] Combined with Figure 1 -Attached Fig. 9 , by setting a conversion mechanism 3 for changing the air circulation channel, the two groups of channels can be used alternately, so as to facilitate the cleaning of the filter 2 and ensure the continuity and efficiency of air filtration; the conversion mechanism 3 includes a double-axis motor 301 fixedly installed inside the cavity 103, which provides a power source for the alternate use of the channels and the cleaning of the filter 2; the output shaft of the double-axis motor 301 is coaxially connected to a multi-section screw rod 302, and by setting the multi-section screw rod 302, it can rotate synchronously with the double-axis motor 301 to achieve the driving function; the ends of the multi-section screw rods 302 that are far away from each other are provided with matching grooves 3021, and the matching grooves 3021 are polygonal in structure, and the matching grooves 3021 are provided to facilitate the purpose of plug-in; The surface of the multi-section screw 302 is fixedly connected with the moving frame 303 through a bearing, and the moving frame 303 is set, so that the multi-section screw 302 can be laterally displaced; it is worth noting that the bearing is a bearing with friction damping in the prior art, and the bearing can play a connecting role, so that the multi-section screw 302 can drive the moving frame 303 to move, and when the moving frame 303 is blocked, the multi-section screw 302 will rotate alone and will no longer drive the moving frame 303 to move; the surface of the moving frame 303 is fixedly installed with a baffle 304 through a slider, and the baffle 304 is set, so that it can move synchronously with the moving frame 303 to block the two sets of channels; Among them, the baffle 304 is slidably matched with the guide groove 104, and stretchable and shrinkable flexible sealing strips 3041 are fixedly installed on both sides of the baffle 304, and the ends of the flexible sealing strips 3041 away from each other are fixedly installed on the inner wall of the guide groove 104. By setting the flexible sealing strips 3041, the cavity 103 can be sealed to prevent air from entering the interior of the cavity 103.

[0022] Combined with Figure 1-Attached Fig. 9 , and also includes two groups of cleaning mechanisms 4 symmetrically arranged inside the channel and used to clean the filter 2, so that the filter 2 inside the sealed channel can be filtered to remove dust and impurities on the filter 2, further improving the cleaning effect and extending the service life of the filter 2; it is worth noting that the two groups of cleaning mechanisms 4 are arranged near the cavity 103; the cleaning mechanism 4 includes a strip plate 401, and round rods 402 are fixedly installed at both ends of the strip plate 401, and the round rods 402 are arranged inside the vertical groove 105. By setting the round rods 402, the strip plate 401 can be driven to move along the vertical groove 105; it is worth noting that the round rod 402 close to the side of the cavity 103 passes through the vertical groove 105 and extends to the inside of the cavity 103; Among them, a circular groove 4021 is opened inside the round rod 402, and the circular groove 4021 is connected with the strip plate 401. A through groove 4022 is opened through the inner wall of the circular groove 4021. By setting the circular groove 4021 and the through groove 4022, it can play a guiding and limiting role; the inner sliding fit of the circular groove 4021 is equipped with a moving rod 403, and one end of the moving rod 403 is arranged inside the strip plate 401, and the other end of the moving rod 403 is elastically connected to the inner wall of the circular groove 4021 through a connecting spring. By setting the moving rod 403, it can slide from the inside of the circular groove 4021 to the inside of the strip plate 401, and by setting the connecting spring, when the moving rod 403 moves, the connecting spring can be stretched to deform and generate a reaction force, so as to facilitate the subsequent resetting of the moving rod 403.

[0023] Among them, two groups of convex rods 404 are symmetrically installed on the surface of the moving rod 403. The convex rods 404 penetrate the interior of the through groove 4022 and are arranged in the interior of the groove 106, and the convex rods 404 are slidably matched with the groove 106. By setting the convex rods 404, on the one hand, they can be squeezed and matched with the groove 106, so that the moving rod 403 can stretch the connecting spring to move inside the strip plate 401; on the other hand, the moving rod 403 can be limited to ensure that it does not rotate when moving; an extrusion block 405 is fixedly installed at one end of the moving rod 403. By setting the extrusion block 405, it can move synchronously with the moving rod 403 to form an extrusion effect; Among them, one side of the extrusion block 405 is slidably matched with a matching block 406, and by setting the matching block 406, it can move under the extrusion of the extrusion block 405; one end of the matching block 406 is fixedly installed with a collision rod 407, and the collision rod 407 can move synchronously with the matching block 406; it is worth noting that one end of the collision rod 407 is a spherical structure, and the spherical end penetrates the strip plate 401 and is close to the frame of the filter screen 2; two groups of limiting grooves 4071 are symmetrically opened on the surface of the collision rod 407, and the internal sliding of the limiting groove 4071 is matched with the limiting block 4072, and the limiting block 4072 is fixedly installed inside the filter body 1, and by setting the limiting groove 4071 and the limiting block 4072, it can play a limiting role, so that the collision rod 407 will not deflect during the movement.

[0024] The surface of the collision rod 407 is provided with a notch 408, and a rack 409 is fixedly installed on the inner wall of the notch 408. By providing the rack 409, the collision rod 407 can move synchronously with the collision rod 407 to play a driving role; the surface of the rack 409 is meshed with a gear 410, and a connecting rod 411 is fixedly installed on one side of the gear 410. By setting the gear 410 and the connecting rod 411, when the collision rod 407 moves, the meshing of the rack 409 and the gear 410 drives the connecting rod 411 to rotate; one end of the connecting rod 411 is fixedly installed with A flexible brush 412 is elastically connected to the surface of the strip plate 401 through a torsion spring. By setting the flexible brush 412, it can rotate synchronously with the connecting rod 411 to clean the surface of the filter 2. The torsion spring is set so that when the flexible brush 412 rotates, it can be driven to deform and generate a reaction force, so that when the extrusion block 405 is reset, the reaction force generated by the torsion spring drives the flexible brush 412 and the collision rod 407 to reset, thereby achieving the purpose of reciprocating swing of the flexible brush 412 to clean the surface of the filter 2. Among them, one end of the round rod 402 close to the cavity 103 is movably connected with a telescopic rod 413. By setting the telescopic rod 413, the round rod 402 can be stretched when sliding inside the vertical groove 105 close to the cavity 103, thereby ensuring the normal sliding of the round rod 402; a rotating rod 414 is fixedly installed at the end of the telescopic rod 413, and the rotating rod 414 is rotatably installed on the inner wall of the cavity 103. By setting the rotating rod 414, the purpose of positioning can be achieved, and the telescopic rod 413 can be rotated with the rotating rod 414 as the rotation center; a matching head 415 is fixedly installed at one end of the rotating rod 414, and by setting the extrusion block 405, it can cooperate with the matching groove 3021, so that the dual-axis motor 301 drives the rotating rod 414 to rotate through the matching groove 3021.

[0025] The bottom surfaces of the two groups of channels are provided with dust suction ports 5, and the dust suction ports 5 are connected to the external negative pressure equipment. By providing the dust suction ports 5, the cleaned dust can be collected and discharged to the outside.

[0026] Specifically, when the central air conditioner is in use, the dual-axis motor 301 is started to drive the multi-section screw rod 302 to move, so that the movable frame can be driven by the multi-section screw rod 302 to move in any direction in the left and right directions and drive the baffle plate 304 to synchronously move laterally, so that one of the two sets of channels originally arranged in parallel is blocked by the baffle plate 304, and the other set of channels will become an air circulation path. When the air flows through it, the filter screen 2 arranged inside the channel begins to filter the air passing through; as the central air conditioner continues to operate, the filter screen 2 arranged inside the air channel responsible for filtering will gradually accumulate dust, resulting in a decrease in filtering efficiency. At this time, the dual-axis motor 301 is controlled to rotate in the opposite direction, and the baffle plate 304 fixedly connected to the movable frame 303 is driven by the multi-section screw rod 302 to move in the opposite direction, so that the current channel for air filtration is blocked, and the other set of channels that were previously blocked are opened, so as to realize channel switching and ensure the continuity and high efficiency of air filtration; When the channel switching is completed, the matching groove 3021 close to the blocked channel will form a stable plug-in state with the adjacent matching head 415, and the moving frame 303 is blocked. As the dual-axis motor 301 continues to rotate, the multi-section screw 302 will rotate independently under the action of the bearing, and drive the telescopic rod 413 to start rotating with the rotating rod 414 as the rotation center. The rotating telescopic rod 413 will drive the round rod 402 connected to the rotation to start sliding inside the vertical groove 105. During the sliding process of the round rod 402, the protruding rod 404 will intermittently squeeze and cooperate with the groove 106, so that the moving rod 403 drives the extrusion block 405 to move toward the direction of the matching block 406 and squeeze it, thereby driving the collision rod 407 to extend and hit the frame of the filter 2, thereby loosening and removing the dust attached to the surface of the filter 2; During the movement of the collision rod 407, through the cooperation of the rack 409 and the gear 410, the connecting rod 411 drives the flexible brush 412 to swing on the surface of the filter 2, brushing off the dust and impurities remaining on the filter 2, further improving the cleaning effect, thereby extending the service life of the filter 2; when the filter 2 is cleaned, the external negative pressure mechanism will also start to move synchronously, so that the cleaned dust is sucked to the outside from the position of the dust suction port 5.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning fresh air filter device, comprising a filter body (1), wherein the filter body (1) is provided with two groups of channels inside, one side of the filter body (1) is provided with an air inlet (101) connected to the channels, and the other side of the filter body (1) is symmetrically provided with two groups of air outlets (102), and the two groups of air outlets (102) are respectively connected to the two groups of channels, and a filter screen (2) is fixedly installed on the inner wall of the air outlet (102), characterized in that: The filter body (1) has a cavity (103) formed inside, the inner wall of the cavity (103) having a guide groove (104) formed therethrough, the inner wall of the cavity (103) having two groups of vertical grooves (105) connected to the channel formed therethrough symmetrically, and the inner walls of the two groups of channels that are away from each other both have vertical grooves (105), and the inner walls of the vertical grooves (105) have multiple groups of grooves (106) formed therethrough symmetrically; And a conversion mechanism (3) for changing an air circulation channel, the conversion mechanism (3) comprising a dual-axis motor (301) fixedly mounted inside a cavity (103), the output shaft of the dual-axis motor (301) being coaxially connected to a multi-section screw rod (302), the surface of the multi-section screw rod (302) being fixedly connected to a moving frame (303) via a bearing, and a baffle (304) being fixedly mounted on the surface of the moving frame (303) via a slider.

2. The fresh air filter device for air conditioning according to claim 1, characterized in that: The ends of the multi-section screw rods (302) that are away from each other are each provided with a matching groove (3021), and the matching groove (3021) is in a polygonal structure.

3. The fresh air filter device for air conditioning according to claim 1, characterized in that: The baffle plate (304) is slidably matched with the guide groove (104), and flexible sealing strips (3041) that can be stretched and contracted are fixedly installed on both sides of the baffle plate (304), and the ends of the flexible sealing strips (3041) that are away from each other are fixedly installed on the inner wall of the guide groove (104).

4. The fresh air filter device for air conditioning according to claim 1, characterized in that: The invention also comprises two groups of cleaning mechanisms (4) symmetrically arranged inside the channel and used for cleaning the filter screen (2), the cleaning mechanism (4) comprising a strip plate (401), round rods (402) being fixedly mounted at both ends of the strip plate (401), a round groove (4021) being provided inside the round rod (402), a moving rod (403) being slidably engaged inside the round groove (4021), one end of the moving rod (403) being arranged inside the strip plate (401), an extrusion block (405) being fixedly mounted on one end of the moving rod (403), a matching block (406) being slidably engaged on one side of the extrusion block (405), a collision rod (407) being fixedly mounted on one end of the matching block (406), and a surface of the collision rod (407) being provided. A notch (408) is provided, a rack (409) is fixedly mounted on the inner wall of the notch (408), a gear (410) is meshedly connected to the surface of the rack (409), a connecting rod (411) is fixedly mounted on one side of the gear (410), a flexible brush (412) is fixedly mounted on one end of the connecting rod (411), and the flexible brush (412) is elastically connected to the surface of the strip plate (401) via a torsion spring, a telescopic rod (413) is movably connected to one end of the round rod (402) close to the cavity (103), a rotating rod (414) is fixedly mounted on the end of the telescopic rod (413), and the rotating rod (414) is rotatably mounted on the inner wall of the cavity (103), and a mating head (415) is fixedly mounted on one end of the rotating rod (414).

5. The fresh air filter device for air conditioning according to claim 4, characterized in that: The circular groove (4021) is connected to the strip plate (401), and a through groove (4022) is provided through the inner wall of the circular groove (4021).

6. The fresh air filter device for air conditioning according to claim 5, characterized in that: The other end of the moving rod (403) is elastically connected to the inner wall of the circular groove (4021) via a connecting spring. Two groups of protruding rods (404) are symmetrically mounted on the surface of the moving rod (403). The protruding rods (404) penetrate through the interior of the through groove (4022) and are disposed inside the groove (106). The protruding rods (404) are slidably matched with the groove (106).

7. The fresh air filter device for air conditioning according to claim 4, characterized in that: Two groups of limiting grooves (4071) are symmetrically formed on the surface of the collision rod (407), and limiting blocks (4072) are slidably matched inside the limiting grooves (4071), and the limiting blocks (4072) are fixedly installed inside the filter body (1).

8. The fresh air filter device for air conditioning according to claim 1, characterized in that: A dust suction port (5) is provided on the bottom surfaces of the two groups of channels, and the dust suction port (5) is connected to an external negative pressure device.

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