An environmentally friendly and energy-saving central air conditioner

Abstract

The present invention relates to the technical field of central air conditioners, and more specifically, to an environmentally friendly and energy-saving central air conditioner, comprising a box, wherein a self-cleaning circulation filter device is provided inside the box, and elastic auxiliary devices are provided on both sides of the box; the elastic auxiliary device comprises a slide groove provided on both sides of the outer wall of the box, wherein a bearing seat is slidably connected inside the slide groove, and a first shaft is rotatably connected inside the bearing seat. The present invention provides power through a motor to drive the filter belt to circulate, so that when the air is filtered by the filter belt, the filter belt that has been cleaned is contacted, and the filter belt will not be blocked and the air intake will not be filtered again, thereby ensuring the filtering effect and the stability of the air intake. The power provided by the motor drives the cleaning roller to perform preliminary cleaning on the filter belt, and then the collision block is used to intermittently impact the filter belt above the dust frame, so that the dust that has not been cleaned by the cleaning roller is shaken off into the dust frame.

Description

Technical Field

[0001] The invention relates to the technical field of central air conditioners, in particular to an environmentally friendly and energy-saving central air conditioner. Background Art

[0002] The central air conditioning system consists of one or more cold and heat source systems and multiple air conditioning systems. In terms of air filtration, from the outside to the inside, there are primary filters, medium filters and high efficiency filters. Through the above three-stage filtration, the dust particles in the airflow are filtered step by step from large to small to ensure the cleanliness of the air sent into the barrier environment. In actual operation, in order to maintain the pressure gradient in the barrier environment, the central air conditioning system is running 24 hours a day. In places with strong winds and sand, the airflow carries some relatively large particles such as leaves, catkins, and debris, which makes the primary and medium efficiency filters easy to get dirty and blocked. When the dirt and blockage reach a certain level, the air sent into the room cannot meet the pressure requirements, and the filter must be replaced.

[0003] At present, in areas with strong winds and sand and more debris in the airflow, the cleaning frequency of the primary filter in the central air conditioner is high. Failure to clean it in time will affect the air filtration flow and quality, and increase the filtration pressure of the middle and high-level filters. Therefore, there is an urgent need for a set of effective solutions and equipment to make the external airflow reach a certain cleanliness before passing through the primary filter, thereby reducing the filtration pressure of the filter. The filter only needs to filter dust particles below 1mm, which is an environmentally friendly and energy-saving central air conditioner.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art that is already known to one of ordinary skill in the art. Summary of the invention

[0005] In view of the problems in the prior art, the present invention provides an environmentally friendly and energy-saving central air conditioner.

[0006] The technical solution adopted by the present invention to solve the technical problem is: an environmentally friendly and energy-saving central air conditioner, comprising a box body, a self-cleaning circulation filter device is arranged inside the box body, and elastic auxiliary devices are arranged on both sides of the box body;

[0007] The elastic auxiliary device comprises a slide groove provided on both sides of the outer wall of the box body, a bearing seat is slidably connected inside the slide groove, a first shaft is rotatably connected inside the bearing seat, a spring is fixedly connected to one side of the outer wall of the bearing seat, a positioning piece is fixedly connected to one end of the spring away from the bearing seat, and the positioning piece is fixedly connected to the box body;

[0008] The self-cleaning circulation filtering device comprises a rotating roller rotatably connected to the top of the box body, both ends of the outer circumference of the first shaft are fixedly connected to the first transmission roller, the bottom of the inner cavity of the box body is rotatably connected to the second shaft, both ends of the outer circumference of the second shaft are fixedly connected to the second transmission roller, the outer circumferences of the rotating roller, the first transmission roller and the second transmission roller are rollingly connected to the filter belt, the middle parts of the outer circumferences of the first shaft and the second shaft are rollingly connected to the transmission belt, the bottom of the inner cavity of the box body is rotatably connected to a pressing rod, the pressing rod is rollingly connected to the transmission belt, a cleaning roller is rotatably connected to one side of the inner wall of the box body, the cleaning roller is fitted with the filter belt, one end of the second shaft passes through the box body and is fixedly connected to the first gear, one end of the cleaning roller passes through the box body and is fixedly connected to the second gear, the first gear and the second gear are meshed, and the diameter of the first gear is 2.5 times the diameter of the second gear.

[0009] Specifically, a plurality of collision blocks are fixed on the outer peripheral surface of the transmission belt in a linear array.

[0010] Specifically, partition plates are fixedly connected on both sides of the inner wall of the box, the partition plates are located between the filter belts, the partition plates are slidably connected to the filter belts, a plurality of rubber rollers in a linear array are rotatably connected on both sides of the inner wall of the box, the rollers and the partition plates clamp the filter belts, the rollers are rollingly connected to the filter belts, a first plate is fixedly connected to one side of the inner wall of the box, a second plate is fixedly connected to one side of the inner wall of the box, and a gap is left between the first plate and the second plate and the box near the filter belt side.

[0011] Specifically, a particle frame is slidably connected to one side of the outer wall of the box, a handle is fixedly connected to one side of the outer wall of the particle frame, a dust frame is fixedly connected to the side of the particle frame away from the handle, the particle frame is located directly below the cleaning roller, and the dust frame is located directly below the transmission belt.

[0012] Specifically, a motor box is fixedly connected to one side of the outer wall of the box body, a motor is fixedly connected inside the motor box, the top end of the motor output shaft is fixedly connected to the first shaft, a baffle is detachably connected to the top of the box body by bolts, a metal wire mesh is fixedly connected to the side of the outer wall of the box body close to the handle, an air inlet duct is fixedly connected to the side of the outer wall of the box body away from the handle, and the air inlet duct is fixedly connected to the inlet of the air conditioning filter.

[0013] Specifically, the filter belt includes a filter mesh, one end of the filter mesh is fixedly connected to a male surface of the Velcro, and the other end of the filter mesh is fixedly connected to a female surface of the Velcro.

[0014] Beneficial effects of the present invention:

[0015] (1) The environmentally friendly and energy-saving central air conditioner described in the present invention is powered by a motor to drive the filter belt to circulate, so that when the air is filtered by the filter belt, it contacts the cleaned filter belt, and will not be filtered again when the filter belt is blocked and the air intake is affected, thereby ensuring the filtering effect and the stability of the air intake.

[0016] (2) The environmentally friendly and energy-saving central air conditioner described in the present invention is powered by a motor to drive a cleaning roller to perform preliminary cleaning on the filter belt, and then uses a collision block to intermittently impact the filter belt above the dust frame, causing the filter belt to vibrate, and the dust that has not been cleaned by the cleaning roller is shaken off into the dust frame, thereby improving the cleaning effect of the filter belt and further improving the filtering effect.

[0017] (3) The environmentally friendly and energy-saving central air conditioner described in the present invention cooperates with the collision block and the filter belt through an elastic auxiliary device, so that when the filter belt vibrates, the filter belt is in a taut state and will not break, thereby preventing the filter belt from being torn and increasing the service life of the filter belt under vibration.

[0018] (4) The filter belt is composed of a Velcro male surface, a Velcro female surface and a filter mesh, which makes it easy to replace the filter belt, is environmentally friendly and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the motor box of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of the box of the present invention;

[0023] Figure 4 It is a partial cross-sectional view of the box body of the present invention;

[0024] Figure 5 It is a schematic diagram of the connection between the transmission belt and the first shaft of the present invention;

[0025] Figure 6 A three-dimensional diagram of the filter belt of the present invention;

[0026] Figure 7 For the present invention Figure 3 A schematic diagram of the structure of part A;

[0027] Figure 8 For the present invention Figure 3 Schematic diagram of the structure of part B;

[0028] Fig. 9 For the present invention Figure 5 Schematic diagram of the C part structure.

[0029] In the figure: 1 box body, 2 self-cleaning circulation filter device, 3 elastic auxiliary device, 4 slide groove, 5 bearing seat, 6 first shaft, 7 spring, 8 positioning plate, 9 rotating roller, 10 first transmission roller, 11 second shaft, 12 second transmission roller, 13 filter belt, 14 transmission belt, 15 collision block, 16 pressing rod, 17 cleaning roller, 18 first gear, 19 second gear, 20 partition plate, 21 roller, 22 first plate, 23 second plate, 24 particle frame, 25 handle, 26 dust frame, 27 motor box, 28 motor, 29 baffle, 30 metal wire mesh, 31 air inlet duct, 32 filter mesh, 33 Velcro male surface, 34 Velcro female surface. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more comprehensive and complete and the concepts of the example embodiments will be fully conveyed to those skilled in the art. The accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0031] In addition, the described features, structures or characteristics may be combined in one or more example embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the example embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced while omitting one or more of the specific details, or other methods, components, steps, etc. may be adopted. In other cases, well-known structures, methods, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.

[0032] like Figure 1-Figure 9 As shown, an environmentally friendly and energy-saving central air conditioner according to the present invention comprises a box body 1, a self-cleaning circulation filter device 2 is provided inside the box body 1, and elastic auxiliary devices 3 are provided on both sides of the box body 1;

[0033] The elastic auxiliary device 3 includes a slide groove 4 opened on both sides of the outer wall of the box body 1, a bearing seat 5 is slidably connected inside the slide groove 4, a first shaft 6 is rotatably connected inside the bearing seat 5, a spring 7 is fixedly connected to one side of the outer wall of the bearing seat 5, and a positioning piece 8 is fixedly connected to one end of the spring 7 away from the bearing seat 5, and the positioning piece 8 is fixedly connected to the box body 1. Through the elastic auxiliary device 3, when the collision block 15 in the self-cleaning circulation filter device 2 collides with the filter belt 13, the filter belt 13 located above the dust frame 26 is squeezed downward, at this time, the filter belt 13 drives the second transmission roller 12, and the second transmission roller 12 drives the second shaft 11 to slide along the slide groove 4, and the second shaft 11 drives the bearing seat 5 close to the motor 28 side, and the bearing seat 5 drives the spring 7 to stretch. When the collision block 15 does not collide with the filter belt 13, the spring 7 drives the bearing seat 5 to reset, so that the filter belt 13 is always in a taut state, and the intermittent collision of the collision block 15 with the filter belt 13 causes the filter belt 13 located above the dust frame 26 to vibrate, and the dust is shaken off into the dust frame 26;

[0034] The self-cleaning circulation filtering device 2 includes a rotating roller 9 rotatably connected to the top of the box body 1, first transmission rollers 10 are fixedly connected to both ends of the outer circumference of the first shaft 6, a second shaft 11 is rotatably connected to the bottom of the inner cavity of the box body 1, and second transmission rollers 12 are fixedly connected to both ends of the outer circumference of the second shaft 11, and filter belts 13 are rollingly connected to the outer circumferences of the rotating roller 9, the first transmission roller 10 and the second transmission roller 12, and a transmission belt 14 is rollingly connected to the middle of the outer circumferences of the first shaft 6 and the second shaft 11, and a plurality of collision blocks 15 are fixed to the outer circumference of the transmission belt 14 in a linear array, a pressing rod 16 is rotatably connected to the bottom of the inner cavity of the box body 1, and the pressing rod 16 is rollingly connected to the transmission belt 14, and a cleaning roller 17 is rotatably connected to one side of the inner wall of the box body 1, and the cleaning roller 17 is in contact with the filter belt 13. One end of the second shaft 11 passes through the housing 1 and is fixedly connected to the first gear 18. One end of the cleaning roller 17 passes through the housing 1 and is fixedly connected to the second gear 19. The first gear 18 and the second gear 19 are meshed. The diameter of the first gear 18 is 2.5 times the diameter of the second gear 19. The second gear 19 and the first shaft 6 are driven to rotate by the first gear 18. The second gear 19 drives the cleaning roller 17 to clean larger impurities or particles on the filter belt 13. The first shaft 6 drives the transmission belt 14, and the transmission belt 14 drives the second shaft 11 to rotate. The second shaft 11 drives the second transmission roller 12 to rotate. The second transmission roller 12 drives the filter belt 13 to roll, and the filter belt 13 circulates to ensure that the housing 1 is always in contact with the clean filter belt 13 for filtration when air is taken in, so as to ensure that the filtration efficiency remains at a normal level.

[0035] Specifically, a plurality of collision blocks are fixed on the outer peripheral surface of the transmission belt in a linear array;

[0036] During the movement of the conveyor belt 14, there is a differential movement between the conveyor belt 14 and the filter belt 13, which causes the transmission belt 14 to drive the collision block 15 to intermittently hit the filter belt 13, causing the filter belt 13 to vibrate. The dust on the filter belt 13 that has not been cleaned by the cleaning roller 17 will fall into the dust frame 26 with the vibration.

[0037] Specifically, partition plates 20 are fixedly connected on both sides of the inner wall of the box body 1, and the partition plates 20 are located between the filter belts 13. The partition plates 20 are slidably connected to the filter belts 13. A plurality of rollers 21 made of rubber in a linear array are rotatably connected on both sides of the inner wall of the box body 1, and the rollers 21 and the partition plates 20 clamp the filter belt 13. The rollers 21 are rollingly connected to the filter belt 13. A first plate 22 is fixedly connected to one side of the inner wall of the box body 1, and a second plate 23 is fixedly connected to one side of the inner wall of the box body 1. A gap is left between the first plate 22 and the second plate 23 near one side of the filter belt 13 and the box body 1, and the filter belt 13 is separated by the partition plates 20. The rollers 21 ensure that the filter belt 13 is tightly attached to the partition plates 20 to ensure the filtering effect. At the same time, the first plate 22 and the second plate 23 reduce the content of external impurities directly entering the box body 1 under the premise of ensuring the normal operation of the filter belt 13.

[0038] Specifically, a particle frame 24 is slidably connected to one side of the outer wall of the box body 1, a handle 25 is fixedly connected to one side of the outer wall of the particle frame 24, and a dust frame 26 is fixedly connected to the side of the particle frame 24 away from the handle 25. The particle frame 24 is located directly below the cleaning roller 17, and the dust frame 26 is located directly below the transmission belt 14. The impurities cleaned from the filter belt 13 are classified and collected through the particle frame 24 and the dust frame 26.

[0039] Specifically, a motor box 27 is fixedly connected to one side of the outer wall of the box body 1, a motor 28 is fixedly connected inside the motor box 27, the top end of the output shaft of the motor 28 is fixedly connected to the first shaft 6, and a baffle 29 is detachably connected to the top of the box body 1 by bolts, a metal wire mesh 30 is fixedly connected to the side of the outer wall of the box body 1 close to the handle 25, and an air inlet duct 31 is fixedly connected to the side of the outer wall of the box body 1 away from the handle 25, the air inlet duct 31 is fixedly connected to the inlet of the air conditioning filter, the output power is provided by the motor 28, and the metal wire mesh 30 is used to prevent larger impurities such as leaves from entering the box body 1, and the preliminarily filtered air is discharged into the air conditioning filter through the air inlet duct 31.

[0040] Specifically, the filter belt 13 includes a filter mesh 32, one end of the filter mesh 32 is fixedly connected to a Velcro male surface 33, and the other end of the filter mesh 32 is fixedly connected to a Velcro female surface 34. The Velcro male surface 33 and the Velcro female surface 34 facilitate the installation and replacement of the filter belt 13.

[0041] The specific implementation method is as follows: the steps of replacing the filter belt 13 are as follows: firstly, the Velcro male surface 33 and the Velcro female surface 34 on the old filter belt 13 to be replaced are torn off, and then the Velcro female surface 34 on the new filter belt 13 is bonded to the Velcro male surface 33 on the old filter belt 13, and then the Velcro female surface 34 on the old filter belt 13 is pulled until the Velcro female surface 34 on the new filter belt 13 extends out from the top of the box body 1, and then the Velcro male surface 33 on the new filter belt 13 is bonded to the Velcro female surface 34;

[0042] During operation: when the central air conditioner starts to work, the outside air passes through the box body 1, enters the air inlet duct 31, and then enters the air conditioner filter. The motor 28 is started, and the motor 28 provides output power to drive the filter belt 13, the transmission belt 14 and the cleaning roller 17 to move. The filter belt 13 moves from the handle 25 side to the elastic auxiliary device 3 side on the box body 1. The cleaning roller 17 rotates continuously to clean the surface of the filter belt 13 passing through. The transmission belt 14 drives the collision block 15 to intermittently impact the filter belt 13 above the dust frame 26. At this time, the elastic auxiliary device 3 ensures the tightness of the filter belt 13, and when the collision block 15 separates from the filter belt 13, it drives the filter belt 13 to reset, so that the filter belt 13 vibrates, and the dust on the filter belt 13 cleaned by the cleaning roller 17 is shaken off into the dust frame 26;

[0043] Technical effects and advantages: The motor 28 provides power to drive the filter belt 13 to circulate, so that when the air is filtered by the filter belt 13, the air contacts the cleaned filter belt 13, and the filter belt 13 will not be blocked to affect the air intake, thereby ensuring the filtering effect and the stability of the air intake;

[0044] The motor 28 provides power to drive the cleaning roller 17 to perform preliminary cleaning on the filter belt 13, and then the collision block 15 intermittently hits the filter belt 13 above the dust frame 26, so that the filter belt 13 vibrates, and the dust that is not cleaned by the cleaning roller 17 is shaken off into the dust frame 26, thereby improving the cleaning effect of the filter belt 13 and further improving the filtering effect;

[0045] The elastic auxiliary device 3 cooperates with the collision block 15 and the filter belt 13, so that when the filter belt 13 vibrates, the filter belt 13 is in a tight state and will not break, thereby preventing the filter belt 13 from being torn, thereby increasing the service life of the filter belt 13 under vibration;

[0046] The filter belt 13 is composed of a Velcro male surface 33, a Velcro female surface 34 and a filter gauze 32, so that the filter belt 13 can be easily replaced, and it is environmentally friendly and low-cost. This embodiment specifically solves the problem in the prior art that in areas with strong winds and sand and more debris in the airflow, the primary filter in the central air conditioner has a high cleaning frequency, and untimely cleaning will affect the air filtration flow and quality, and increase the filtration pressure of the middle and high-level filters. Therefore, there is an urgent need for a set of effective solutions and equipment to enable the external airflow to reach a certain cleanliness before passing through the primary filter, thereby reducing the filtration pressure of the filter, and the filter only needs to filter dust particles below 1mm, which is an environmentally friendly and energy-saving central air conditioner.

[0047] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[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. An environmentally friendly and energy-saving central air conditioner, characterized in that: It comprises a box body (1), wherein a self-cleaning circulation filtering device (2) is provided inside the box body (1), and elastic auxiliary devices (3) are provided on both sides of the box body (1); The elastic auxiliary device (3) comprises a slide groove (4) provided on both sides of the outer wall of the box body (1); a bearing seat (5) is slidably connected inside the slide groove (4); a first shaft (6) is rotatably connected inside the bearing seat (5); a spring (7) is fixedly connected to one side of the outer wall of the bearing seat (5); a positioning piece (8) is fixedly connected to one end of the spring (7) away from the bearing seat (5); and the positioning piece (8) is fixedly connected to the box body (1); The self-cleaning circulating filtering device (2) comprises a rotating roller (9) rotatably connected to the top of the housing (1); first transmission rollers (10) are fixedly connected to both ends of the outer circumference of the first shaft (6); a second shaft (11) is rotatably connected to the bottom of the inner cavity of the housing (1); second transmission rollers (12) are fixedly connected to both ends of the outer circumference of the second shaft (11); filter belts (13) are rollingly connected to the outer circumferences of the rotating roller (9), the first transmission roller (10) and the second transmission roller (12); a transmission belt (14) is rollingly connected to the middle of the outer circumferences of the first shaft (6) and the second shaft (11); and the housing (1) is provided with a plurality of filter belts (13) which are connected to the outer circumferences of the rotating roller (9), the first transmission roller (10) and the second transmission roller (12). ) The bottom of the inner cavity is rotatably connected to a pressing rod (16), the pressing rod (16) is rollingly connected to the transmission belt (14), one side of the inner wall of the box body (1) is rotatably connected to a cleaning roller (17), the cleaning roller (17) is in contact with the filter belt (13), one end of the second shaft (11) passes through the box body (1) and is fixedly connected to a first gear (18), one end of the cleaning roller (17) passes through the box body (1) and is fixedly connected to a second gear (19), the first gear (18) and the second gear (19) are meshed, and the diameter of the first gear (18) is 2.5 times the diameter of the second gear (19); A plurality of collision blocks (15) are fixed on the outer peripheral surface of the transmission belt (14) in a linear array.

2. The environmentally friendly and energy-saving central air conditioner according to claim 1, characterized in that: A partition plate (20) is fixedly connected to both sides of the inner wall of the box body (1), the partition plate (20) is located between the filter belts (13), the partition plate (20) is slidably connected to the filter belt (13), a plurality of rollers (21) made of rubber material in a linear array are rotatably connected to both sides of the inner wall of the box body (1), the rollers (21) and the partition plate (20) clamp the filter belt (13), the rollers (21) are rollingly connected to the filter belt (13), a first plate (22) is fixedly connected to one side of the inner wall of the box body (1), and a second plate (23) is fixedly connected to one side of the inner wall of the box body (1), and a gap is left between the first plate (22) and the second plate (23) and the box body (1) on the side close to the filter belt (13).

3. The environmentally friendly and energy-saving central air conditioner according to claim 1, characterized in that: A particle frame (24) is slidably connected to one side of the outer wall of the box body (1); a handle (25) is fixedly connected to one side of the outer wall of the particle frame (24); a dust frame (26) is fixedly connected to the side of the particle frame (24) away from the handle (25); the particle frame (24) is located directly below the cleaning roller (17); and the dust frame (26) is located directly below the transmission belt (14).

4. The environmentally friendly and energy-saving central air conditioner according to claim 3 is characterized in that: A motor box (27) is fixedly connected to one side of the outer wall of the box body (1), a motor (28) is fixedly connected inside the motor box (27), a top end of an output shaft of the motor (28) is fixedly connected to the first shaft (6), a baffle (29) is detachably connected to the top of the box body (1) via bolts, a metal wire mesh (30) is fixedly connected to the side of the outer wall of the box body (1) close to the handle (25), an air inlet duct (31) is fixedly connected to the side of the outer wall of the box body (1) away from the handle (25), and the air inlet duct (31) is fixedly connected to an inlet of an air conditioner filter.

5. The environmentally friendly and energy-saving central air conditioner according to claim 1, characterized in that: The filter belt (13) comprises a filter mesh (32), one end of the filter mesh (32) being fixedly connected to a Velcro male surface (33), and the other end of the filter mesh (32) being fixedly connected to a Velcro female surface (34).

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