A dual-stage dual-core reverse osmosis pure water machine

Abstract

This utility model relates to the field of pure water machine technology and discloses a dual-stage dual-core reverse osmosis pure water machine, including a casing. A cleaning mechanism is provided inside the casing for cleaning the filter element. A storage mechanism is provided on the rear side of the casing, and a reverse osmosis component is located on the left side of the cleaning mechanism. The cleaning mechanism includes a primary high-pressure pump, the bottom of which is fixedly connected to the bottom right end of the inner side of the casing. A filter cartridge is fixedly connected to the front of the primary high-pressure pump, and a servo motor is fixedly connected to the top of the filter cartridge. A PP filter element is fixedly connected to the output end of the servo motor. In this utility model, a soft brush is used to clean the surface of the filter element, and compressed gas is sprayed through a nozzle to blow off the brushed dirt and discharge it through the drain port. This achieves efficient cleaning of the PP filter element, effectively removing surface dirt to prevent clogging, ensuring filtration efficiency, and extending the service life of the filter element.

Description

Technical Field

[0001] This utility model relates to the field of pure water machine technology, and in particular to a dual-stage dual-core reverse osmosis pure water machine. Background Technology

[0002] As an advanced water purification device, the dual-stage dual-core reverse osmosis water purifier has emerged and plays a key role in various scenarios, gradually becoming an important choice for ensuring water safety and quality.

[0003] The dual-stage dual-core reverse osmosis water purifier adopts a unique dual-stage reverse osmosis technology and dual-core processing mode. Through the synergistic work of two stages of reverse osmosis membranes, the raw water is deeply purified. The first stage reverse osmosis membrane initially filters out most of the impurities, heavy metal ions, bacteria, viruses and other harmful substances in the water. After the first stage of treatment, the water enters the second stage reverse osmosis membrane for more refined filtration, further improving the water quality and greatly increasing the quality of pure water produced.

[0004] When the raw water quality is poor, containing a large amount of colloids, organic matter, and calcium and magnesium ions with high hardness, ordinary two-stage reverse osmosis devices will experience membrane fouling problems. This not only significantly reduces filtration efficiency but also leads to a decline in the quality of the produced water. Existing technologies have added multiple filtration methods in the pretreatment stage, such as removing large particulate impurities through multi-media filters and adsorbing organic matter and residual chlorine through activated carbon filters. This greatly reduces the impurities in the raw water entering the reverse osmosis device. However, the PP filter cartridges of water purifiers become clogged due to the accumulation of dirt after prolonged use. Manual cleaning requires frequent disassembly, is cumbersome, and is not thorough, which in turn affects filtration efficiency and reduces the service life of the equipment. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a dual-stage dual-core reverse osmosis water purifier, which aims to improve the problem of incomplete filter cleaning affecting filtration efficiency in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-stage dual-core reverse osmosis pure water machine, including a casing, a cleaning mechanism is provided inside the casing for cleaning the filter element, and a storage mechanism is provided on the rear side inside the casing.

[0007] The cleaning mechanism includes a primary high-pressure pump, the bottom of which is fixedly connected to the bottom right end of the inner side of the casing. A filter cartridge is fixedly connected to the front of the primary high-pressure pump, a servo motor is fixedly connected to the top of the filter cartridge, and a PP filter element is fixedly connected to the output end of the servo motor. Soft brushes are fixedly connected to both the left and right sides inside the filter cartridge. An air pipe is connected to the top left end of the inner side of the filter cartridge, and a nozzle is connected to the bottom end of the air pipe. A scraper is fixedly connected to the bottom end of the PP filter element. A sewage discharge component is provided at the right end of the filter cartridge. A primary filtration component is provided at the bottom inner side of the casing. A reverse osmosis component is provided on the left side of the cleaning mechanism, and a water outlet component is provided at the top of the reverse osmosis component.

[0008] As a further description of the above technical solution:

[0009] The sewage discharge assembly includes a sewage discharge pipe, the left end of which is connected to the bottom right side of the filter bucket, and a control valve is rotatably connected to the middle of the inner side of the sewage discharge pipe.

[0010] As a further description of the above technical solution:

[0011] The primary filtration assembly includes multiple filter canisters, the bottoms of which are fixedly connected to the inner bottom rear end of the housing. The tops of the two filter canisters on the left are connected to a conveying pipe, and the other ends of the two conveying pipes are respectively connected to the tops of the two filter canisters on the right.

[0012] As a further description of the above technical solution:

[0013] The reverse osmosis assembly includes two pure water tanks. The bottoms of the two pure water tanks are fixedly connected to the left and right ends of the bottom of the inner side of the casing, respectively. The tops of the two pure water tanks are connected to a second delivery pipe. The right ends of the two second delivery pipes are connected to a reverse osmosis cylinder. The right ends of the two reverse osmosis cylinders are connected to a third water delivery pipe. The bottom end of the third water delivery pipe on the left side is connected to a secondary high-pressure pump.

[0014] As a further description of the above technical solution:

[0015] The water outlet assembly includes a water outlet pipe, the bottom end of which is connected to the top left side of the left pure water tank, and the other end of which is connected to a water outlet head. A drain box is fixedly connected to the front left side of the housing.

[0016] As a further description of the above technical solution:

[0017] The right end of the secondary high-pressure pump is fixedly connected to the left end of the right pure water tank, and the right end of the third water supply pipe on the right side is connected to the bottom left side of the filter bucket.

[0018] As a further description of the above technical solution:

[0019] The storage mechanism includes a storage door, the upper and lower sides of which are fixedly connected to the upper and lower rear ends of the inner side of the housing, respectively. The upper and lower rear ends of the inner side of the housing are provided with sliding grooves, and a sliding door is slidably connected between adjacent sliding grooves. An observation window is fixedly connected to the front side of the sliding door. Screws are fixedly connected to the upper and lower ends of the rear side of the housing. Compression springs are slidably connected to the outer front ends of the two screws. The same brush is slidably connected to the outer middle of the two screws. Adjusting nuts are threadedly connected to the outer rear ends of the two screws. A fixing component is provided on the left side of the sliding door.

[0020] As a further description of the above technical solution:

[0021] The fixing assembly includes two fixing plates. The right sides of the two fixing plates are respectively fixedly connected to the left side of the sliding door and the left rear end of the housing. The same pin is slidably connected inside the two fixing plates. A top plate is fixedly connected to the outer rear end of the pin, and a return spring is slidably connected to the outer middle of the pin.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, a servo motor drives the PP filter element to rotate, a soft brush inside the filter barrel brushes its surface, compressed gas delivered by the air pipe is sprayed through the nozzle to blow off the dirt brushed off, and a rotating scraper scrapes off the dirt and discharges it through the drain pipe. This achieves efficient cleaning of the PP filter element, effectively removes surface dirt to prevent clogging, ensures filtration efficiency, reduces the frequency of manual cleaning, improves maintenance convenience, and extends the service life of the filter element.

[0024] 2. In this utility model, the sliding door is opened and closed by sliding along the slide groove. Rotating the adjusting nut compresses the compression spring, so that the brush is in close contact with the sliding door and the observation window for cleaning. When closing the door, pulling the pin compresses the reset spring. After aligning with the fixing plate, the spring is released and the reset spring pushes the pin into the fixing plate for fixation. This realizes convenient opening and closing of the machine housing space and door cleaning, reduces space occupation, improves observation clarity and equipment maintenance convenience. Attached Figure Description

[0025] Figure 1 This is a front view of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model;

[0026] Figure 2 This is a perspective view of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model;

[0027] Figure 3 This is a schematic diagram of the sliding door structure of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model;

[0028] Figure 4 for Figure 3 Enlarged view of point A;

[0029] Figure 5 This is a schematic diagram of the chute structure of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model;

[0030] Figure 6 This is a schematic diagram of the filter tank of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model;

[0031] Figure 7 This is a cross-sectional view of the filter cartridge of a dual-stage dual-core reverse osmosis pure water machine proposed in this utility model.

[0032] Legend:

[0033] 1. Housing; 2. Cleaning mechanism; 201. Primary high-pressure pump; 202. Filter cartridge; 203. Servo motor; 204. PP filter element; 205. Soft brush; 206. Air pipe; 207. Nozzle; 208. Scraper; 209. Sewage discharge assembly; 2091. Sewage discharge pipe; 2092. Control valve; 210. Primary filtration assembly; 2101. Filter tank; 2102. Delivery pipe one; 3. Storage mechanism; 301. Storage door; 302. Slide rail; 303. Sliding door; 304. Observation window; 305. Screw; 306. Compression spring; 307. Brush; 308. Adjusting nut; 309. Fixing assembly; 3091. Fixing plate; 3092. Pin; 3093. Top plate; 3094. Return spring; 211. Reverse osmosis assembly; 2111. Pure water tank; 2112. Delivery pipe two; 2113. Reverse osmosis cylinder; 2114. Water delivery pipe three; 2115. Secondary high-pressure pump; 212. Water outlet assembly; 2121. Water outlet pipe; 2122. Water outlet head; 2123. Drain box. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figure 2 , Figure 6 and Figure 7 The present invention provides an embodiment of a dual-stage dual-core reverse osmosis pure water machine, including a housing 1. The housing 1 is provided with a cleaning mechanism 2 inside, which is used to clean the filter element and ensure the filtration efficiency of the filter element. The housing 1 is provided with a storage mechanism 3 on the rear side inside, which makes it easier to open the housing 1, reduce the space occupied, and improve the convenience of use.

[0036] The cleaning mechanism 2 includes a primary high-pressure pump 201, whose bottom is fixedly connected to the bottom right end of the inner side of the casing 1, providing power for the water flow. A filter cartridge 202 is fixedly connected to the front of the primary high-pressure pump 201, providing installation space for the filter components. A servo motor 203 is fixedly connected to the top of the filter cartridge 202, providing power for the rotation of the PP filter element 204. The output end of the servo motor 203 is fixedly connected to the PP filter element 204 for preliminary filtration of impurities in the water. Soft brushes 20 are fixedly connected to both the left and right sides inside the filter cartridge 202. 5. The surface of the PP filter element 204 is brushed when it rotates. The top left end of the inner side of the filter barrel 202 is connected to an air pipe 206, which is used to transport compressed gas to provide an air source for cleaning. The bottom end of the air pipe 206 is connected to a nozzle 207. The nozzle 207 sprays compressed gas when the PP filter element 204 rotates, so that the dirt brushed off the surface is blown to the bottom, enhancing the cleaning effect. The bottom end of the PP filter element 204 is fixedly connected to a scraper 208, which rotates with the filter element to scrape the dirt to the sewage discharge component 209, improving the dirt removal efficiency.

[0037] A sewage discharge assembly 209 is provided at the right end of the filter tank 202. The sewage discharge assembly 209 includes a sewage discharge pipe 2091. The left end of the sewage discharge pipe 2091 is connected to the bottom right side of the filter tank 202 for discharging dirt. A control valve 2092 is rotatably connected to the middle inner side of the sewage discharge pipe 2091 to control the opening and closing of the sewage discharge pipe 2091. A primary filtration assembly 210 is provided at the bottom inner side of the housing 1 for preliminary filtration of the raw water. The primary filtration assembly 210 includes multiple filter tanks 2101. The bottom of the multiple filter tanks 2101 is fixedly connected to the rear end of the bottom inner side of the housing 1 to provide a container for the filter medium. The top of the two filter tanks 2101 on the left side is connected to a conveying pipe 2102 for conveying the filtered water. The other end of the two conveying pipes 2102 is connected to the top of the two filter tanks 2101 on the right side, respectively, to achieve multi-stage primary filtration.

[0038] Specifically, the filter tank 2101 of the primary filtration component 210 performs preliminary filtration of the raw water. The raw water is continuously transported through the delivery pipe 2102. The first-stage high-pressure pump 201 provides power to make the water flow into the filter bucket 202. The PP filter element 204 performs preliminary filtration of impurities in the water. When the PP filter element 204 needs to be cleaned, the servo motor 203 drives the PP filter element 204 to rotate. The soft brush 205 in the filter bucket 202 brushes its surface. The compressed gas delivered by the air pipe 206 is sprayed through the nozzle 207 to blow off the brushed dirt. The scraper 208 at the bottom of the PP filter element 204 rotates with it to scrape the dirt to the bottom of the filter bucket 202. The control valve 2092 on the drain pipe 2091 is opened to discharge the dirt.

[0039] Reference Figure 3 , Figure 4and Figure 5 The storage mechanism 3 includes a storage door 301, whose upper and lower sides are fixedly connected to the upper and lower rear ends of the inner side of the housing 1, respectively, providing an installation base for the sliding door 303. Slide grooves 302 are provided on both the upper and lower rear ends of the inner side of the housing 1, providing a path for the sliding door 303 to slide. A sliding door 303 is slidably connected between adjacent slide grooves 302, allowing for opening and closing control of the internal space of the housing 1. An observation window 304 is fixedly connected to the front of the sliding door 303 for easy observation of the interior. Screws 305 are fixedly connected to the upper and lower ends of the rear side of the housing 1, providing a mounting base for the compression spring 306 and the brush 307. The sliding door 303 and the observation window 304 are cleaned by a support structure. Compression springs 306 are slidably connected to the outer front ends of the two screws 305 to provide elasticity for the brush 307. The same brush 307 is slidably connected to the middle of the outer sides of the two screws 305 to clean the surface of the sliding door 303 and the observation window 304 while storing the brush. Adjusting nuts 308 are threaded to the outer rear ends of the two screws 305. By rotating the adjusting nuts 308, the compression springs 306 are compressed, so that the brush 307 is in close contact with the sliding door 303 to enhance the cleaning effect. A fixing component 309 is provided on the left side of the sliding door 303 to fix the sliding door 303.

[0040] The fixing assembly 309 includes two fixing plates 3091. The right sides of the two fixing plates 3091 are fixedly connected to the left side of the sliding door 303 and the left rear end of the housing 1, respectively, to provide an insertion position for the pin 3092. The same pin 3092 is slidably connected inside both fixing plates 3091 to fix the two fixing plates 3091. The outer rear end of the pin 3092 is fixedly connected to a top plate 3093 to transmit the elastic force of the return spring 3094. The middle outer part of the pin 3092 is slidably connected to the return spring 3094 to provide the return force for the pin 3092. By pulling the pin 3092, the top plate 3093 compresses the return spring 3094, aligning the two fixing plates 3091. When the pin 3092 is released, the return spring 3094 rebounds, allowing the pin 3092 to insert into the rear fixing plate 3091, thus completing the fixing of the sliding door 303 and ensuring the stability of the sliding door 303.

[0041] Specifically, when the storage mechanism 3 is working, the sliding door 303 slides along the slide groove 302 of the housing 1 to open and close the internal space of the housing 1. The adjusting nut 308 on the rotating screw 305 compresses the compression spring 306, so that the brush 307 is in close contact with the surface of the sliding door 303 and the observation window 304 for cleaning. When the sliding door 303 is closed, the latch 3092 is pulled to drive the top plate 3093 to compress the return spring 3094. After aligning the two fixing plates 3091, the latch 3092 is released. The return spring 3094 rebounds and pushes the latch 3092 to insert into the rear fixing plate 3091, thus completing the stable fixation of the sliding door 303. The storage door 301 provides storage space for the sliding door 303.

[0042] Reference Figure 1 , Figure 2 and Figure 6 The reverse osmosis assembly 211 includes two pure water tanks 2111. The bottoms of the two pure water tanks 2111 are fixedly connected to the left and right ends of the bottom of the inner side of the casing 1, respectively, for storing treated pure water. The tops of both pure water tanks 2111 are connected to a second delivery pipe 2112 for transmitting pure water. The right ends of both delivery pipes 2112 are connected to a reverse osmosis cylinder 2113 for reverse osmosis filtration. The right ends of both reverse osmosis cylinders 2113 are connected to a third water delivery pipe 2114 for transmitting water to be filtered. The bottom end of the left water delivery pipe 2114 is connected to a secondary high-pressure pump 2115 to provide power for the water flow. The water delivery pipe 2114 introduces the filtered water into the reverse osmosis cylinder 2113 through the secondary high-pressure pump 2115, and after passing through the reverse osmosis cylinder 2113, the filtered water is filtered and then filtered. After infiltration, the water enters the pure water tank 2111 for multi-stage purification. The top of the pure water tank 2111 on the left side is equipped with a water outlet component 212 for pure water output. The water outlet component 212 includes a water outlet pipe 2121. The bottom end of the water outlet pipe 2121 is connected to the top left side of the pure water tank 2111 on the left side to guide the pure water out. The other end of the water outlet pipe 2121 is connected to a water outlet head 2122 for easy collection of pure water. A drain box 2123 is fixedly connected to the front left side of the casing 1 to collect dripping water droplets and keep it clean. The right end of the secondary high-pressure pump 2115 is fixedly connected to the left end of the pure water tank 2111 on the right side to ensure stable installation. The right end of the right water supply pipe 2114 is connected to the bottom left side of the filter bucket 202 to achieve stable delivery of filtered water.

[0043] Specifically, when the reverse osmosis component 211 is working, the secondary high-pressure pump 2115 provides power and introduces water into the reverse osmosis cartridge 2113 for filtration through the water supply pipe 3 2114. The water treated by reverse osmosis enters the pure water tank 2111 for storage through the delivery pipe 2 2112. The right water supply pipe 3 2114 stably delivers water to the filter cartridge 202. The pure water in the pure water tank 2111 on the left is output from the water outlet 2122 through the water outlet pipe 2121. The drain box 2123 collects the dripping water droplets, realizing multi-stage purification, pure water storage and convenient output.

[0044] Working principle: First, the raw water undergoes preliminary filtration in the primary filtration unit 210's filter tank 2101. It is then continuously transported through the first delivery pipe 2102. A first-stage high-pressure pump 201 powers the water flow into the filter cartridge 202, where the PP filter element 204 performs preliminary filtration of impurities. A second-stage high-pressure pump 2115 powers the water through the third water delivery pipe 2114, introducing it into the reverse osmosis cartridge 2113 for filtration. The treated water then enters the pure water tank 2111 for storage via the second delivery pipe 2112. The third water delivery pipe on the right side... 2114 stably delivers water to filter bucket 202. Pure water from the pure water tank 2111 on the left is output from the outlet head 2122 through the outlet pipe 2121. The drain box 2123 collects the dripping water droplets. When cleaning the PP filter element 204, the servo motor 203 drives it to rotate. The soft brush 205 brushes the surface. The compressed gas from the air pipe 206 is sprayed through the nozzle 207 to blow away the dirt. The scraper 208 scrapes the dirt to the bottom of the filter bucket 202. The control valve 2092 of the drain pipe 2091 is opened to discharge the dirt.

[0045] Furthermore, when the storage mechanism 3 is working, the sliding door 303 slides along the slide groove 302 of the housing 1 to open and close the internal space of the housing 1. The screw 305 on the rear side of the housing 1 provides support for the compression spring 306 and the brush 307. Rotating the adjusting nut 308 compresses the compression spring 306, so that the brush 307 is in close contact with the surface of the sliding door 303 and the observation window 304 for cleaning. When fixing the sliding door 303, pulling the pin 3092 drives the top plate 3093 to compress the return spring 3094. After aligning the fixing plate 3091 on the left side of the sliding door 303 with the fixing plate 3091 of the housing 1, the pin 3092 is released. The return spring 3094 rebounds and pushes the pin 3092 to insert into the rear fixing plate 3091, completing the stable fixing of the sliding door 303. The storage door 301 provides a storage base for the sliding door 303.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-stage double-core reverse osmosis pure water machine comprising a casing (1), characterized in that: The housing (1) is provided with a cleaning mechanism (2) inside, which is used to clean the filter element. The housing (1) is provided with a storage mechanism (3) on the rear side inside. The cleaning mechanism (2) includes a primary high-pressure pump (201). The bottom of the primary high-pressure pump (201) is fixedly connected to the bottom right end of the inner side of the housing (1). A filter barrel (202) is fixedly connected to the front side of the primary high-pressure pump (201). A servo motor (203) is fixedly connected to the top of the filter barrel (202). A PP filter element (204) is fixedly connected to the output end of the servo motor (203). Soft brushes (205) are fixedly connected to the left and right sides inside the filter barrel (202). The top left end of the inner side of the 02) is connected to an air pipe (206), the bottom end of the air pipe (206) is connected to a nozzle (207), the bottom end of the PP filter element (204) is fixedly connected to a scraper (208), the right end of the filter bucket (202) is provided with a sewage discharge component (209), the bottom of the inner side of the housing (1) is provided with a primary filter component (210), the left side of the cleaning mechanism (2) is provided with a reverse osmosis component (211), and the top of the reverse osmosis component (211) is provided with a water outlet component (212).

2. The dual-stage dual-core reverse osmosis water purifier according to claim 1, characterized in that: The sewage discharge assembly (209) includes a sewage discharge pipe (2091), the left end of which is connected to the bottom right side of the filter bucket (202), and a control valve (2092) is rotatably connected to the middle inner side of the sewage discharge pipe (2091).

3. The dual-stage dual-core reverse osmosis water purifier according to claim 1, characterized in that: The primary filtration assembly (210) includes multiple filter canisters (2101). The bottom of each filter canister (2101) is fixedly connected to the rear end of the inner bottom of the housing (1). The top of the two filter canisters (2101) on the left side is connected to a first conveying pipe (2102). The other end of the two first conveying pipes (2102) is connected to the top of the two filter canisters (2101) on the right side, respectively.

4. The dual-stage dual-core reverse osmosis water purifier according to claim 1, characterized in that: The reverse osmosis assembly (211) includes two pure water tanks (2111). The bottoms of the two pure water tanks (2111) are fixedly connected to the bottom left and right ends of the inner side of the casing (1). The tops of the two pure water tanks (2111) are connected to the second delivery pipe (2112). The right ends of the two delivery pipes (2112) are connected to the reverse osmosis cylinder (2113). The right ends of the two reverse osmosis cylinders (2113) are connected to the third water delivery pipe (2114). The bottom end of the third water delivery pipe (2114) on the left side is connected to the secondary high-pressure pump (2115).

5. The dual-stage dual-core reverse osmosis water purifier according to claim 4, characterized in that: The water outlet assembly (212) includes a water outlet pipe (2121), the bottom end of which is connected to the top left side of the left pure water tank (2111), and the other end of which is connected to a water outlet head (2122). A drain box (2123) is fixedly connected to the front left side of the housing (1).

6. The dual-stage dual-core reverse osmosis water purifier according to claim 4, characterized in that: The right end of the secondary high-pressure pump (2115) is fixedly connected to the left end of the right pure water tank (2111), and the right end of the right water supply pipe (2114) is connected to the bottom left side of the filter bucket (202).

7. The dual-stage dual-core reverse osmosis water purifier according to claim 1, characterized in that: The storage mechanism (3) includes a storage door (301). The upper and lower sides of the storage door (301) are fixedly connected to the upper and lower rear ends of the inner side of the housing (1). The upper and lower rear ends of the inner side of the housing (1) are provided with sliding grooves (302). A sliding door (303) is slidably connected between the two adjacent sliding grooves (302). An observation window (304) is fixedly connected to the front side of the sliding door (303). A screw (305) is fixedly connected to the upper and lower ends of the rear side of the housing (1). A compression spring (306) is slidably connected to the front end of the outer side of the two screws (305). The same brush (307) is slidably connected to the middle of the outer side of the two screws (305). An adjusting nut (308) is threadedly connected to the rear end of the outer side of the two screws (305). A fixing component (309) is provided on the left side of the sliding door (303).

8. The dual-stage dual-core reverse osmosis water purifier according to claim 7, characterized in that: The fixing component (309) includes two fixing plates (3091). The right sides of the two fixing plates (3091) are respectively fixedly connected to the left side of the sliding door (303) and the left rear end of the housing (1). The same pin (3092) is slidably connected inside the two fixing plates (3091). The outer rear end of the pin (3092) is fixedly connected to the top plate (3093). The middle outer part of the pin (3092) is slidably connected to the return spring (3094).

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