Uniform air inlet device of solution dehumidification air conditioner

Abstract

The utility model provides a kind of uniform air intake device of solution dehumidification air conditioner, belong to air conditioning technical field;Including:Air conditioner host, the top of air conditioner host is equipped with air inlet, the top of air inlet is equipped with air inlet box, the air inlet box is used to connect external air inlet pipeline, the both ends opening of air inlet box are rotationally connected with air inlet board piece, the inboard of air inlet board piece is equipped with filter plate;The uniform air intake device equipped with the solution dehumidification air conditioner system adopts double firm design, improves the connection reliability between each component.In the connecting portion of air inlet board piece and air inlet box, operator gently pushes L-shaped plug rod, it can be accurately inserted into the insertion slot of fixed seat preset.This time, built-in first spring will immediately produce rebound force, make L-shaped plug rod and fixed seat form tight mechanical engagement, this design not only simplifies installation process, more importantly, it ensures that the connection between air inlet board piece and air inlet box has very high stability.

Description

Technical Field

[0001] This utility model belongs to the field of air conditioning technology, specifically relating to a uniform air intake device for a solution dehumidification air conditioner. Background Technology

[0002] Solution dehumidification air conditioning technology was developed to overcome the low energy efficiency, difficulty in adapting to changes in indoor heat-to-humidity ratio, and air quality issues of traditional air conditioning systems that combine heat and humidity treatment. Traditional air conditioning dehumidifies by cooling air below the dew point, resulting in high energy consumption and a high risk of mold growth. Solution dehumidification utilizes the properties of hygroscopic salt solutions, achieving humidity regulation through direct contact between the solution and air. This process produces no condensation, eradicates mold growth breeding grounds, and the solution itself has bactericidal properties. This technology allows for independent temperature and humidity control, is more energy-efficient, and can utilize low-grade heat sources such as industrial waste heat and solar energy to drive regeneration.

[0003] Chinese Patent Publication No. CN208998205U discloses a uniform air intake device for a solution dehumidification air conditioner. By setting up an air intake box, it provides uniform air intake to the dehumidifier, so that the intake air can more completely and effectively come into full contact with the sprayed solution in the dehumidifier, thereby improving the dehumidification effect. According to the technical solution provided in the embodiment of this application, an inclined plate is set on the side wall of the air intake box. When the solution falls, it splashes out from the inner air intake and falls onto the inclined plate. The solution accumulates in the corner of the inclined plate. When the solution within the angle formed by the inclined plate and the side wall of the dehumidification box reaches the inner air intake, the solution falls back into the solution tank along the inner air intake.

[0004] However, this dehumidifier has a significant design flaw: its air inlet lacks any filtration system. This design flaw allows dust, particulate matter, and other impurities in the air to easily enter the dehumidification system. These contaminants not only adhere to the surface of the dehumidification solution, reducing its moisture absorption capacity and lifespan, but can also accumulate inside the system, eventually clogging critical components such as the spray nozzles, thus significantly reducing the overall efficiency of the dehumidification system. Meanwhile, while some existing air conditioning equipment incorporates an air inlet panel structure with a filter plate installed inside, this design still presents several problems. First, some air inlet panels use a snap-fit ​​connection, which, while convenient for installation and disassembly, is prone to loosening over long-term use, resulting in poor connection stability. Second, the existing connection method between the filter plate and the air inlet panel also poses safety hazards. It typically uses an aluminum sheet structure for fixation, requiring manual bending of the aluminum sheet to secure the filter plate. This fixing method not only easily causes operators to cut their hands during bending, but also, because the aluminum sheet needs to be frequently moved and adjusted, the fixing effect will decrease over time, resulting in loosening and affecting the filtration effect. Utility Model Content

[0005] To address the poor installation stability issue in the existing technology, this utility model provides a uniform air intake device for a solution dehumidification air conditioner. It employs a combination of plug-in components and clamping components to improve the connection effect. The specific technical solution is as follows: A uniform air intake device for a solution dehumidification air conditioner includes: an air conditioning unit; an air inlet is installed on the top of the air conditioning unit; an air inlet box is installed on the top of the air inlet; the air inlet box is used to connect to an external air inlet duct; air inlet plates are rotatably connected to the openings at both ends of the air inlet box; a filter plate is installed on the inner side of the air inlet plate; two sets of plug-in components are installed on the side wall of the air inlet plate; two sets of fixing seats are installed on both sides of the inner wall of the air inlet box; the plug-in components correspond one-to-one with the fixing seats; the plug-in components are adapted to the fixing seats; and the plug-in components are used to fix the air inlet plate to the air inlet box; multiple sets of clamping components are installed on the inner side of the air inlet plate; the clamping components are used to fix the filter plate.

[0006] Preferably, the air inlet panel includes: a connecting frame and a grille plate. The connecting frame is rotatably connected to both ends of the air inlet box via hinges. A grille plate is installed in the middle of the connecting frame. The grille plate is used for uniform air intake. The filter plate is installed inside the connecting frame and located on opposite sides of the two grille plates.

[0007] Preferably, a carrier plate is installed on the inner wall of each of the two openings of the air inlet box, and the carrier plate is used to limit the connection frame.

[0008] Preferably, the plug-in component includes: a U-shaped plate, an L-shaped plug, and a strip opening; two U-shaped plates are installed on one side of the connecting frame, and two strip openings are provided; an L-shaped plug is slidably inserted between the two side plates of the U-shaped plate, and the L-shaped plug corresponds one-to-one with the strip opening; the bent end of the L-shaped plug slidably extends through the strip opening and slidably extends to the middle of the connecting frame.

[0009] Preferably, the U-shaped plate is fixed to the connecting frame by a first screw.

[0010] Preferably, a limiting plate is fixedly mounted on the surface of the L-shaped insert, and a first spring is welded between the limiting plate and the U-shaped plate, the first spring being sleeved on the outside of the L-shaped insert.

[0011] Preferably, the clamping component includes: a connecting block, a sliding groove, and a clamping block. Multiple connecting blocks are equidistantly installed on the inner side of the connecting frame. A sliding groove is provided on the connecting block, and a clamping block is slidably connected in the sliding groove. The clamping block is used to clamp the filter plate.

[0012] Preferably, the connecting block is fixed to the connecting frame by a second screw.

[0013] Preferably, a protrusion is installed on the connecting block, and a second spring is welded between the protrusion and the clamping block. The second spring is located in the groove, and the side of the clamping block near the filter plate has an inclined structure, which is used to guide the filter plate to be inserted into the bottom of the clamping block.

[0014] In addition, the uniform air intake device of the solution dehumidification air conditioner in the above-mentioned technical solution provided by this utility model may also have the following features: a fixing piece is installed at the joint between the filter plate and the clamping block.

[0015] In the above technical solution, the fixing piece is used to prevent the clamping block from directly clamping the filter plate.

[0016] The uniform air intake device for a solution dehumidification air conditioner of this utility model has the following advantages compared with the prior art:

[0017] 1. The uniform air intake device of this solution dehumidification air conditioning system adopts a dual-stabilization design, significantly improving the reliability of the connection between various components. First, at the connection between the air intake plate and the air intake box, the operator only needs to gently move the L-shaped plug to accurately insert it into the preset slot of the fixing seat. At this time, the built-in first spring will immediately generate a rebound force, so that the L-shaped plug and the fixing seat form a tight mechanical engagement. This design not only simplifies the installation process, but more importantly, ensures that the connection between the air intake plate and the air intake box has extremely high stability, effectively preventing loosening during operation.

[0018] 2. Secondly, regarding the fixing of the filter plate, this device employs an innovative spring clamping mechanism. Through the elastic force of the second spring, a specially designed clamping block can firmly lock onto the edge of the filter plate, completely eliminating the risk of the filter plate accidentally detaching from the connecting frame during use. During installation, simply press the filter plate downwards; the edge of the filter plate will contact the inclined surface of the clamping block and generate an interaction force. During this process, the clamping block compresses the second spring. Once the filter plate is fully in place, the rebound force of the second spring will automatically reset the clamping block and firmly lock the filter plate in place. This design ensures both ease of installation and the long-term stability of the filter plate, greatly improving the overall reliability of the air intake device. Attached Figure Description

[0019] Figure 1 A three-dimensional structural schematic diagram of the uniform air intake device for the solution dehumidification air conditioner provided by this utility model;

[0020] Figure 2 A cross-sectional schematic diagram of the air inlet box provided by this utility model;

[0021] Figure 3 for Figure 2Enlarged view of point A;

[0022] Figure 4 A schematic diagram of the structure of the plug-in component provided by this utility model;

[0023] Figure 5 A top view of the clamping component provided by this utility model;

[0024] in, Figures 1 to 5 The reference numerals and component names in the attached drawings are as follows: 1. Air conditioning unit, 2. Air inlet, 3. Air inlet box, 4. Air inlet plate, 5. Connecting frame, 6. Grille plate, 7. Filter plate, 8. Hinge, 9. Carrier plate, 10. Fixing base, 11. Insertion component, 12. Clamping component, 71. Fixing piece, 111. U-shaped plate, 112. First screw, 113. L-shaped insert rod, 114. Strip opening, 115. Limiting plate, 116. First spring, 121. Connecting block, 122. Second screw, 123. Protrusion, 124. Slide groove, 125. Clamping block, 126. Second spring. Detailed Implementation

[0025] The following are specific implementation cases and appendices. Figures 1-5 This invention provides a further description of the present invention, but it is not limited to these embodiments. The present invention provides a technical solution: a uniform air intake device for a solution dehumidification air conditioning system, mainly composed of an air conditioning unit 1, an air inlet 2, an air inlet box 3, and supporting components. The specific structure of the device includes: the air conditioning unit 1 as the core component, with a square air inlet 2 on its top, which is securely connected to the air inlet box 3 above via a flange connection. The air inlet box 3 is made of high-quality galvanized steel plate, and its two ends are equipped with standard interfaces for connecting external air intake ducts, ensuring seamless connection with the ventilation system. Specially designed air inlet plates 4 are rotatably connected to the openings at both ends of the air inlet box 3 via a bearing structure. Each air inlet plate 4 has a removable filter plate 7 embedded inside, which is made of high-efficiency HEPA filter material.

[0026] Regarding the fixing mechanism, two sets of precision-machined plug-in components 11 are symmetrically installed on the side walls of the air inlet panel 4. These components are made of stainless steel to ensure durability. Correspondingly, two sets of high-strength fixing seats 10 are provided on each side of the inner wall of the air inlet box 3. Each fixing seat 10 is precisely positioned and perfectly matched with the plug-in component 11. This plug-in fixing structure not only ensures the stable installation of the air inlet panel 4, but also facilitates quick disassembly during daily maintenance. In addition, multiple sets of elastic clamping components 12 are arranged in the inner space of the air inlet panel 4. These clamping components are designed with spring steel sheets, which can firmly fix the filter plates 7 of different thicknesses, while ensuring the sealing between the filter plates 7 and the air inlet panel 4, effectively preventing airflow leakage. The design of the entire device fully considers the principles of aerodynamics, ensuring uniform airflow distribution and improving the overall operating efficiency of the air conditioning system.

[0027] As a preferred option, the air inlet panel 4 is further composed of two core components: a connecting frame 5 and a grille plate 6. The connecting frame 5 is made of metal and is rotatably connected to the air inlet box 3 at both ends via high-strength hinges 8, facilitating maintenance and cleaning. The grille plate 6 uses a uniformly distributed strip structure and is bolted to the center of the connecting frame 5, ensuring even airflow and providing initial filtration. To improve filtration, a filter plate 7 is specially installed inside the connecting frame 5, positioned between the two grille plates 6, and is removable for periodic replacement or cleaning. The overall design of the air inlet panel 4 ensures both uniform airflow and multi-stage filtration.

[0028] As a preferred option, furthermore, the inner walls of the openings at both ends of the air inlet box 3 are symmetrically equipped with carrier plates 9 for limiting the connecting frame 5. Specifically, at the openings on the left and right sides of the air inlet box 3, a flat metal carrier plate 9 is fixedly installed on the inner wall surface of each opening. These two carrier plates 9 are symmetrically distributed, and their installation positions and dimensions are precisely designed to effectively limit and fix the inserted connecting frame 5, ensuring that the connecting frame 5 is installed accurately and stably in the air inlet box 3.

[0029] As a preferred embodiment, the connector 11 is further composed of three key components: a U-shaped plate 111, an L-shaped insert 113, and a strip-shaped opening 114. Specifically, two U-shaped plates 111 with a U-shaped structure are symmetrically installed on one end face of the connecting frame 5. These two U-shaped plates 111 are arranged in parallel and have the same opening direction. At the same time, two slender strip-shaped openings 114 are precisely machined on the same side of the connecting frame 5. The positions of these openings correspond to the installation positions of the U-shaped plates 111. A sliding guide structure is designed between the two upright plates of each U-shaped plate 111, allowing the L-shaped insert 113 to slide smoothly back and forth between them. The side of the fixing base 10 has a slot adapted to the L-shaped insert 113. It is particularly noteworthy that each L-shaped insert 113 corresponds exactly to one strip-shaped opening 114, and its unique bent end can slide along the length direction of the strip-shaped opening 114. When the L-shaped insert 113 is fully extended, its bent end can not only pass completely through the strip opening 114, but also extend further inward, eventually reaching the central area of ​​the connecting frame 5, thereby achieving a stable connection function.

[0030] As a preferred option, the U-shaped plate 111 is further secured to the upper part of the connecting frame 5 by the first screw 112. This connection method ensures structural stability and facilitates subsequent disassembly and maintenance. Specifically, the bottom of the U-shaped plate 111 has a threaded hole that matches the first screw 112, and the corresponding position of the connecting frame 5 also has pre-drilled mounting holes. When the first screw 112 is screwed in, the U-shaped plate 111 and the connecting frame 5 are tightly connected together, forming a reliable mechanical fixation. This fixing method is not only easy to install but also can withstand a large load, ensuring the stability of the overall structure.

[0031] As a preferred embodiment, the cylindrical surface of the L-shaped insert 113 is securely fitted with an annular limiting plate 115 made of high-strength steel via an interference fit. A helical first spring 116, made of high-quality spring steel, is vertically welded between the limiting plate 115 and the inner wall of the U-shaped support plate 111. The first spring 116 is coaxially and tightly fitted onto the outer circumferential surface of the L-shaped insert 113, with its two ends tightly fitted to the contact surfaces of the limiting plate 115 and the U-shaped plate 111, respectively. This structural design ensures that the spring can be uniformly compressed under force, while limiting the axial displacement range of the L-shaped insert 113.

[0032] As a preferred embodiment, the clamping component 12 is further composed of three key components: a connecting block 121, a sliding groove 124, and a clamping block 125. Specifically, four identical connecting blocks 121 are fixedly installed on the inner side of the connecting frame 5 in an equidistant manner, with these connecting blocks evenly distributed around the inner circumference of the connecting frame. Each connecting block 121 has a precisely machined longitudinally extending sliding groove 124 at its center. The dimensions of the sliding groove 124 are carefully designed to ensure a smooth sliding fit of the clamping block 125 within it. As the component that directly contacts the filter plate 7, the clamping block 125's specially designed clamping end can firmly fix the filter plate 7, ensuring that it will not loosen or shift during operation. The overall structural design of the clamping component 12 ensures both ease of assembly and reliable clamping, providing a strong guarantee for the stable operation of the filter plate 7.

[0033] As a preferred embodiment, the connecting block 121 is further secured to the designated installation position of the connecting frame 5 by a second screw 122. The second screw 122 passes through a pre-drilled mounting hole in the connecting block 121 and precisely engages with the corresponding threaded hole on the connecting frame 5. The two components are tightly connected by rotational tightening, ensuring the stability and reliability of the overall structure. This fixing method facilitates installation and disassembly while ensuring that the connection will not loosen or shift under stress.

[0034] As a preferred embodiment, a raised bump 123 is fixedly installed on the upper surface of the connecting block 121. This bump 123 is made of high-strength metal material to ensure structural stability. A second spring 126, made of high-quality spring steel, is firmly connected to the bump 123 and the adjacent clamping block 125 by welding. The second spring 126 is precisely installed inside the slide groove 124, the dimensions of which perfectly match the spring diameter, ensuring smooth extension and retraction. The side of the clamping block 125 closest to the filter plate 7 is specially machined to form a precise inclined structure. The inclination angle of this inclined surface is precisely calculated to effectively guide the filter plate 7 to slide smoothly into and accurately position itself at the bottom of the clamping block 125. The entire mechanism is rationally designed, and all components fit tightly together, ensuring smooth and reliable installation and removal of the filter plate 7.

[0035] As a preferred option, furthermore, during equipment assembly, a fixing piece 71 is specially installed at the contact point between the filter plate 7 and the clamping block 125. The main function of this fixing piece 71 is to act as a protective isolation layer, effectively preventing the clamping block 125 from directly applying pressure to the filter plate 7 during clamping. This design not only protects the filter plate 7 from damage caused by direct clamping but also ensures a more stable and reliable connection between the two. The installation position of the fixing piece 71 is precisely calculated so that it does not affect the normal function of the filter plate 7 while fully utilizing its buffering and protective role, thereby extending the service life of the filter plate 7 and improving the overall operational stability of the equipment.

[0036] The air conditioning unit, air inlet box, and filter plate in this case are existing technologies, and any air conditioning unit, air inlet box, and filter plate that meet the requirements of this case are acceptable.

[0037] The specific types or circuit structures of the controllers for the electrical components mentioned in this application, as well as the circuit connection relationships between the electrical components and the accurate coordinated control of multiple power components, are all prior art. Therefore, the above content will not be elaborated upon in this application.

[0038] Working Principle: All electrical components described in this application are externally connected to a power supply and control switch during use. After installation, first check the installation, fixation, and safety precautions before use. In actual operation, the user first needs to accurately install the air inlet box 3 at the top of the air inlet 2 of the air conditioning unit 1. During installation, use the matching screws to firmly connect the air inlet box 3 to the air inlet 2, ensuring the sealing and stability between them. Then, align the pre-prepared air inlet pipe with the opening at the top of the air inlet box 3 and tighten it with screws as well. When the system is running, external air first enters the air inlet box 3 through the air inlet pipe, and then passes through two parallel grille plates 6 in sequence. This design effectively disperses the airflow, ensuring that the air enters the air conditioning unit 1 evenly. Simultaneously, the air undergoes fine filtration through two filter plates 7 before entering the unit, effectively intercepting dust and impurities to ensure the cleanliness of the air entering the air conditioner.

[0039] When the filter plate 7 needs to be replaced or cleaned, the operating steps are as follows: First, the air inlet box 3 needs to be removed from the air inlet 2 to provide sufficient working space for subsequent operations. After disassembly, the operator reaches into the inner wall area of ​​the connecting frame 5 to locate the L-shaped insert 113. By pulling the L-shaped insert 113 outward, it slides smoothly within the track of the strip opening 114. During this process, the L-shaped insert 113 will drive the limiting plate 115 to move, thereby stretching the first spring 116 to produce elastic deformation. When the L-shaped insert 113 is completely pulled out of the slot of the fixing seat 10, the connecting frame 5 can be rotated freely to open it, at which point the filter plate 7 will be fully exposed to the operator. Next, the operator needs to simultaneously move the clamps 125 on both sides, which are normally clamped under the action of the second spring 126. When moving them, appropriate force needs to be applied to move the clamps 125 upward and completely retract them into the top space of the connecting block 121, thereby releasing the clamp on the filter plate 7. The filter plate 7 that needs to be replaced can then be easily removed from the connecting frame 5. The removed filter plate 7 can then be cleaned or replaced. When installing a new or cleaned filter plate 7, align it with the inner groove of the connecting frame 5 and then press down evenly. During the pressing process, the edge of the filter plate 7 will contact the inclined surface of the clamping block 125. This inclined surface will guide the clamping block 125 to move outwards, while simultaneously compressing the second spring 126. Once the filter plate 7 is fully in place, the clamping block 125 will automatically reset under the restoring force of the spring, firmly clamping the filter plate 7 in the correct position, completing the entire replacement process.

[0040] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A uniform air intake device for a solution dehumidification air conditioner, comprising: An air conditioning unit (1) is characterized in that an air inlet (2) is installed on the top of the air conditioning unit (1), an air inlet box (3) is installed on the top of the air inlet (2), the air inlet box (3) is used to connect to an external air inlet pipe, and an air inlet plate (4) is rotatably connected to the openings at both ends of the air inlet box (3), and a filter plate (7) is installed on the inner side of the air inlet plate (4). Two sets of plug-in components (11) are installed on the side wall of the air inlet plate (4), and two sets of fixing seats (10) are installed on both sides of the inner wall of the air inlet box (3). The plug-in components (11) correspond one-to-one with the fixing seats (10), and the plug-in components (11) are adapted to the fixing seats (10). The plug-in components (11) are used to fix the air inlet plate (4) on the air inlet box (3). Multiple sets of clamping components (12) are installed on the inner side of the air inlet plate (4), and the clamping components (12) are used to fix the filter plate (7).

2. The uniform air intake device for a solution dehumidification air conditioner according to claim 1, characterized in that, The air inlet plate (4) includes a connecting frame (5) and a grille plate (6). The connecting frame (5) is rotatably connected to both ends of the air inlet box (3) via hinges (8). The grille plate (6) is installed in the middle of the connecting frame (5). The grille plate (6) is used for uniform air intake. The filter plate (7) is installed inside the connecting frame (5) and located on the opposite side of the two grille plates (6).

3. The uniform air intake device for solution dehumidification air conditioning according to claim 2, characterized in that, Carrier plates (9) are installed on the inner walls of the openings at both ends of the air inlet box (3), and the carrier plates (9) are used to limit the connecting frame (5).

4. The uniform air intake device for a solution dehumidification air conditioner according to claim 3, characterized in that, The plug-in component (11) includes: a U-shaped plate (111), an L-shaped plug (113), and a strip opening (114); two U-shaped plates (111) are installed on one side of the connecting frame (5), and two strip openings (114) are provided; an L-shaped plug (113) is slidably inserted between the two side plates of the U-shaped plate (111), and the L-shaped plug (113) corresponds one-to-one with the strip opening (114); the bent end of the L-shaped plug (113) can slidably extend through the strip opening (114) and can slidably extend to the middle of the connecting frame (5).

5. The uniform air intake device for a solution dehumidification air conditioner according to claim 4, characterized in that, The U-shaped plate (111) is fixed to the connecting frame (5) by the first screw (112).

6. The uniform air intake device for a solution dehumidification air conditioner according to claim 4, characterized in that, A limiting plate (115) is fixedly mounted on the surface of the L-shaped insert (113). A first spring (116) is welded between the limiting plate (115) and the U-shaped plate (111). The first spring (116) is sleeved on the outside of the L-shaped insert (113).

7. The uniform air intake device for a solution dehumidification air conditioner according to claim 2, characterized in that, The clamping component (12) includes: a connecting block (121), a sliding groove (124), and a clamping block (125). Multiple connecting blocks (121) are equidistantly installed on the inner side of the connecting frame (5). A sliding groove (124) is provided on the connecting block (121). A clamping block (125) is slidably connected in the sliding groove (124). The clamping block (125) is used to clamp the filter plate (7).

8. The uniform air intake device for a solution dehumidification air conditioner according to claim 7, characterized in that, The connecting block (121) is fixed to the connecting frame (5) by a second screw (122).

9. The uniform air intake device for a solution dehumidification air conditioner according to claim 7, characterized in that, A protrusion (123) is installed on the connecting block (121). A second spring (126) is welded between the protrusion (123) and the clamping block (125). The second spring (126) is located in the slide groove (124). The side of the clamping block (125) near the filter plate (7) has an inclined structure, which is used to guide the filter plate (7) to be inserted into the bottom of the clamping block (125).

10. The uniform air intake device for a solution dehumidification air conditioner according to claim 9, characterized in that, A fixing piece (71) is installed at the contact point between the filter plate (7) and the clamping block (125). The fixing piece (71) is used to prevent the clamping block (125) from directly clamping the filter plate (7).

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