Natural village sewage purification device

Abstract

The utility model discloses a natural village sewage purification device which comprises a storage cylinder, a purification assembly is arranged in the storage cylinder and comprises a cylinder cover, the cylinder cover is arranged in an opening in the top end of the storage cylinder in a threaded mode, and a filter plate and a piston plate are arranged in the storage cylinder from top to bottom in a sliding mode. And a plurality of pressure limiting valves are fixedly arranged on the peripheral wall of the middle part of the storage cylinder in a circumferential array in a penetrating manner. In the use process of the improved natural village sewage purification device, impurities in domestic sewage can be filtered out and fermented into waste for use, part of the purified sewage can be directly injected into soil in a vegetable field to complete irrigation of the vegetable field when needed, and the other part of the purified sewage can be directly injected into the soil in the vegetable field to complete irrigation of the vegetable field when needed. The device is high in sewage utilization rate, consumables do not need to be replaced in the using process of the device, the cost is low in the using process of the device, and the device can be well suitable for being used in natural villages.

Description

Technical Field

[0001] This utility model relates to the technical field of sewage purification devices, and in particular to a sewage purification device for natural villages. Background Technology

[0002] A natural village is a settlement formed naturally by villagers living together in a certain natural environment over a long period of time. It is one or more settlements formed naturally by families, clans, or other reasons. In the process of people living in a natural village, a large amount of sewage will inevitably be generated. This sewage is generally directly diverted through pipes to a general sewage purification device for storage.

[0003] Existing wastewater purification devices generally purify wastewater into qualified water for discharge or reuse through physical or chemical filtration. During the use of these devices, filter cartridges or chemical agents generally need to be replaced regularly, resulting in high wastewater purification costs and making them unsuitable for use in natural villages. Utility Model Content

[0004] The purpose of this utility model is to provide a sewage purification device for natural villages, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sewage purification device for natural villages, including a storage cylinder, a purification component inside the storage cylinder, the purification component including a cylinder cover, the cylinder cover being threaded into the top opening of the storage cylinder, a filter plate and a piston plate being slidably arranged from top to bottom inside the storage cylinder, a plurality of pressure limiting valves being fixedly installed in a circular row on the outer peripheral wall of the middle part of the storage cylinder, and a plurality of one-way valves being fixedly installed in a circular row on the outer peripheral wall of the top of the storage cylinder;

[0006] The storage cylinder is equipped with an adjustment mechanism for adjusting the vertical position of the filter plate and the piston plate;

[0007] A connecting mechanism is provided at the center of the filter plate for power connection between the filter plate and the adjustment mechanism.

[0008] Preferably, the bottom side of the filter plate is provided with a plurality of limiting blocks in a circumferential array, and each limiting block is fixedly connected to the inner wall of the storage cylinder, and the pressure limiting valve is located below the limiting blocks.

[0009] Preferably, the adjusting mechanism includes a threaded rod, which is vertically positioned at the axial center inside the storage cylinder. The bottom end of the threaded rod is threaded through the piston plate and inserted into the cylinder wall of the storage cylinder, where it is rotatably connected. Two guide rods are provided opposite to each other on the outer periphery of the threaded rod, and the bottom end of each guide rod is fixedly connected to the inner bottom wall of the storage cylinder. The guide rods slide through the filter plate and the piston plate. A driving component is provided on the outer periphery of the top of the threaded rod, and a limiting component is provided inside the threaded rod.

[0010] Preferably, the connecting mechanism includes a collar, which is threaded onto the outer periphery of the threaded rod and rotatably passes through the filter plate. A plurality of air storage grooves are formed on the outer periphery of the collar. A positioning groove in the shape of a quarter sphere is formed at the position corresponding to the air storage groove on the filter plate. A piston rod is slidably installed in the air storage groove. A ball is rotatably installed in the piston rod, and the end of the ball close to the corresponding positioning groove is inserted into the corresponding positioning groove and contacts the inner wall of the corresponding positioning groove.

[0011] Preferably, the driving component includes a knob that is rotatably mounted on the top side of the storage cylinder and located on the outer periphery of the cylinder cover. A gear is fixedly mounted on the bottom end of the knob, and the gear is in clearance fit with the inner wall of the storage cylinder. A toothed ring is sleeved on the outer periphery of the top end of the threaded rod, and the inner ring wall of the toothed ring is rotatably connected to the inner wall of the storage cylinder through a bearing. The toothed ring is meshed with the gear, and the top end of the threaded rod is fixedly connected to the inner ring wall of the toothed ring through several connecting rods.

[0012] Preferably, the limiting member includes a square rod with an L-shaped configuration, the top end of the threaded rod having a groove, and the bottom of the square rod being inserted into the groove and slidably connected to the inner wall of the groove. The upper and lower ends of the square rod are in contact with the bottom side of the cylinder cover and the top side of the filter plate, respectively.

[0013] This utility model has the following beneficial effects:

[0014] This improved wastewater purification device for natural villages can filter out impurities from domestic sewage and ferment it into waste for use. Some of the purified sewage can be directly injected into the soil in the vegetable garden when needed to irrigate the garden. Another part of the purified sewage is vaporized into water vapor to simulate drip irrigation for the vegetable garden. The wastewater utilization rate is high, and no consumables need to be replaced during the use of the device. The cost of using the device is low, and it can be well adapted to the use of natural villages. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of the overall structure of this utility model;

[0017] Figure 2 This is a perspective view of the overall structure of this utility model;

[0018] Figure 3 This is a perspective view of the storage cylinder of this utility model after it has been inverted;

[0019] Figure 4 This is a right view of the internal structure of the storage cylinder of this utility model;

[0020] Figure 5 This is a perspective view of the overall structure of the threaded rod, gear ring, and gear of this utility model.

[0021] Figure 6 This is a perspective view of the internal structure of the collar of this utility model;

[0022] Figure 7 This is a perspective view of the internal structure of the filter plate of this utility model;

[0023] Figure 8 This is a perspective view of the internal structure of part of the threaded rod of this utility model.

[0024] In the diagram: 1. Storage cylinder; 2. Purification assembly; 21. Cylinder cover; 22. Filter plate; 23. Piston plate; 24. Pressure relief valve; 25. Check valve; 3. Adjustment mechanism; 31. Threaded rod; 32. Drive component; 321. Knob; 322. Gear; 323. Gear ring; 324. Connecting rod; 33. Limiting component; 331. Slide groove; 332. Square rod; 34. Guide rod; 4. Connecting mechanism; 41. Collar; 42. Gas storage tank; 43. Positioning groove; 44. Piston rod; 45. Ball bearing; 5. Limiting block. Detailed Implementation

[0025] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] This utility model provides a technical solution: (Refer to...) Figure 1 - Figure 4The present invention discloses a sewage purification device for a natural village, including a storage cylinder 1, a purification component 2 inside the storage cylinder 1, the purification component 2 including a cylinder cover 21, the cylinder cover 21 being threaded into the top opening of the storage cylinder 1, a filter plate 22 and a piston plate 23 being slidably arranged from top to bottom inside the storage cylinder 1, a plurality of pressure limiting valves 24 being fixedly installed in a circular row on the outer peripheral wall of the middle part of the storage cylinder 1, and a plurality of one-way valves 25 being fixedly installed in a circular row on the outer peripheral wall of the top of the storage cylinder 1.

[0027] The storage cylinder 1 is equipped with an adjustment mechanism 3, which is used to adjust the vertical position of the filter plate 22 and the piston plate 23;

[0028] A connecting mechanism 4 is provided at the center of the filter plate 22 for power connection between the filter plate 22 and the adjusting mechanism 3.

[0029] In this embodiment, please refer to Figure 3 As shown, several gas exchange holes are formed on the bottom side of the storage cylinder 1 to allow free gas exchange between the bottom of the storage cylinder 1 and the outside. This prevents the piston plate 23 from moving inside the storage cylinder 1 and creating a negative pressure chamber at the bottom, which would affect the upward movement of the piston plate 23 within the storage cylinder 1. Please refer to [reference needed]. Figure 2 and Figure 4 As shown, a water inlet is fixedly installed through the cylinder cover 21 for connecting the external sewage drain pipe to the inside of the storage cylinder 1. Please refer to [reference needed]. Figure 2 - Figure 4 As shown, specifically: the domestic sewage generated by a single household in the natural village is introduced into the storage tank 1 through the sewage drain pipe and the water inlet. A certain amount of soil needs to be laid on the top side of the filter plate 22 to enhance the filtration intensity of the filter plate 22. The sewage entering the storage tank 1 falls directly onto the soil on the top side of the filter plate 22. The soil and the filter plate 22 intercept most of the impurities in the sewage and place them on the top side of the filter plate 22. The water slowly permeates the soil, passes through the holes of the filter plate 22, and falls into the bottom of the storage tank 1 for storage.

[0030] Please refer to Figure 2 and Figure 4 As shown, when the vegetable garden needs watering, the height of the piston plate 23 is adjusted upward by the cooperation of the adjusting mechanism 3 and the connecting mechanism 4. At this time, since the water flow in the holes and gaps of the filter plate 22 is very small, most of the water is pushed out of the storage cylinder 1 through the pressure relief valve 24. The water pushed out by the pressure relief valve 24 is directly injected into the soil in the vegetable garden to replenish the water in the soil, thereby completing the irrigation of the vegetable garden.

[0031] The debris placed on the top side of the filter plate 22 ferments into fertilizer over time. During the fermentation process, the temperature inside the storage cylinder 1 rises. At this time, some of the water at the bottom of the storage cylinder 1 evaporates into water vapor and is discharged through the one-way valve 25 to the top of the storage cylinder 1. After the water vapor comes into contact with the vegetables in the vegetable garden, most of the water vapor condenses on the vegetables and falls onto the ground of the vegetable garden to replenish the moisture in the soil near the vegetable garden, simulating the drip irrigation operation of the vegetable garden. The wastewater utilization rate is high, and no consumables need to be replaced during the use of the device. The cost of using the device is low and it can be well adapted to the use of natural villages.

[0032] In a further preferred embodiment of this utility model, such as Figure 4 As shown, the bottom side of the filter plate 22 is provided with a number of limiting blocks 5 in a circular array, and each limiting block 5 is fixedly connected to the inner wall of the storage cylinder 1. The pressure relief valve 24 is located below the limiting block 5.

[0033] In this embodiment, please refer to Figure 4 As shown, after the filter plate 22 moves down to the corresponding position, it will not continue to move down due to the mutual contact between the filter plate 22 and the limiting block 5, so as to avoid the filter plate 22 moving down too far and affecting the storage space of sewage in the storage cylinder 1.

[0034] In a further preferred embodiment of this utility model, such as Figure 4 and Figure 5 As shown, the adjusting mechanism 3 includes a threaded rod 31, which is vertically positioned at the axial center inside the storage cylinder 1. The bottom end of the threaded rod 31 is threaded through the piston plate 23 and inserted into the cylinder wall of the storage cylinder 1, where it is rotatably connected to the cylinder wall. Two guide rods 34 are provided on the outer periphery of the threaded rod 31, and the bottom end of each guide rod 34 is fixedly connected to the inner bottom wall of the storage cylinder 1. The guide rods 34 slide through the filter plate 22 and the piston plate 23. A driving member 32 is provided on the outer periphery of the top of the threaded rod 31, and a limiting member 33 is provided inside the threaded rod 31.

[0035] In this embodiment, please refer to Figure 4 and Figure 5 As shown, the threaded rod 31 can be rotated by the drive component 32. At this time, due to the mutual contact between the guide rod 34 and the filter plate 22 and the piston plate 23, the piston plate 23 and the filter plate 22 will not be rotated together during the rotation of the threaded rod 31, thereby driving the piston plate 23 and the filter plate 22 to move up or down. The device is easy to operate.

[0036] In a further preferred embodiment of this utility model, such as Figure 4 - Figure 7As shown, the connecting mechanism 4 includes a collar 41, which is threaded onto the outer periphery of the threaded rod 31 and rotates through the filter plate 22. Several air storage grooves 42 are opened on the outer periphery of the collar 41. A positioning groove 43 with a quarter spherical shape is opened on the filter plate 22 at the position corresponding to the air storage groove 42. A piston rod 44 is slidably installed in the air storage groove 42. A ball bearing 45 is rotatably installed in the piston rod 44. The end of the ball bearing 45 close to the corresponding positioning groove 43 is inserted into the corresponding positioning groove 43 and contacts the inner wall of the corresponding positioning groove 43.

[0037] In this embodiment, please refer to Figure 5 and Figure 7 As shown, during the rotation of the threaded rod 31, the limiting member 33 constrains and limits the filter plate 22, and the filter plate 22 and the limiting block 5 abut against each other, so the filter plate 22 cannot continue to move upward. At this time, because the ball 45 abuts against the inner wall of the positioning groove 43, the ball 45 can be squeezed out of the positioning groove 43 along the outer arc wall of the ball 45, so that the rotating threaded rod 31 drives the collar 41 to rotate freely in the filter plate 22, so that the threaded rod 31 will not get stuck.

[0038] In a further preferred embodiment of this utility model, such as Figure 2 , Figure 4 and Figure 5 As shown, the driving component 32 includes a knob 321, which is rotatably mounted on the top side of the storage cylinder 1 and located on the outer periphery of the cylinder cover 21. A gear 322 is fixedly mounted on the bottom end of the knob 321, and the gear 322 is clearance-fitted with the inner wall of the storage cylinder 1. A toothed ring 323 is sleeved on the outer periphery of the top end of the threaded rod 31, and the inner ring wall of the toothed ring 323 is rotatably connected to the inner wall of the storage cylinder 1 through a bearing. The toothed ring 323 is meshed with the gear 322, and the top end of the threaded rod 31 is fixedly connected to the inner ring wall of the toothed ring 323 through several connecting rods 324.

[0039] In this embodiment, please refer to Figure 2 , Figure 4 and Figure 5 As shown, the operator rotates the knob 321, which drives the gear 322 to rotate. It should be noted that the knob 321 can be replaced with an electric drive structure to reduce the operator's workload when using the device. The rotating gear 322 drives the threaded rod 31 to rotate synchronously through the gear ring 323 and the connecting rod 324. Since the diameter of the gear 322 is much smaller than the diameter of the gear ring 323, the driving force applied by the knob 321 to the threaded rod 31 can be greatly enhanced, thereby reducing the operator's workload when using the device.

[0040] In a further preferred embodiment of this utility model, such as Figure 4 , Figure 5 and Figure 8As shown, the limiting member 33 includes a square rod 332 with an L-shaped shape. The top end of the threaded rod 31 is provided with a sliding groove 331, and the bottom of the square rod 332 is inserted into the sliding groove 331 and slidably connected to the inner wall of the sliding groove 331. The upper and lower ends of the square rod 332 are in contact with the bottom side of the cylinder cover 21 and the top side of the filter plate 22, respectively.

[0041] In this embodiment, please refer to Figure 4 and Figure 8 As shown, when the cylinder cover 21 is not unscrewed from the top opening of the storage cylinder 1, the filter plate 22 remains stable in the storage cylinder 1 due to the mutual contact between the square rod 332 and the cylinder cover 21, the collar 41 and the filter plate 22, as well as the mutual contact between the filter plate 22 and the limiting block 5. After the cylinder cover is unscrewed from the storage cylinder 1, the square rod 332 can slide upward in the sliding groove 331, and the threaded rod 31 can drive the filter plate 22 to move upward normally to cope with the use of the device at different times.

[0042] Working principle: When installing this improved natural village sewage purification device, the operator first digs a pit of the corresponding size in the middle of the vegetable garden, then puts the storage cylinder 1 into the pit, and makes the one-way valve 25 located on the top side of the ground. Then, the soil is filled into the gap between the storage cylinder 1 and the inner wall of the pit, and the storage cylinder 1 is buried in the middle of the vegetable garden.

[0043] After the storage cylinder 1 is installed, the operator unscrews the cylinder cover 21 from the top opening of the storage cylinder 1. Then, the operator turns the knob 321 to drive the gear 322 to rotate, and drives the threaded rod 31 to rotate through the gear ring 323 and the connecting rod 324. Due to the mutual contact between the guide rod 34 and the filter plate 22 and the mutual contact between the ball 45 and the inner wall of the positioning groove 43, the rotating threaded rod 31 pushes the filter plate 22 and the piston plate 23 upward. After the operator adjusts the filter plate 22 to the appropriate position, the operator sprinkles an appropriate amount of soil on the filter plate 22 from the top opening of the storage cylinder 1. Due to the interception of the soil by the filter plate 22, the soil is spread on the top side of the filter plate 22. Then, the operator turns the knob 321 in the opposite direction to push the filter plate 22 downward until the filter plate 22 contacts the limit block 5. Finally, the drain outlet of the sewage drain pipe is connected to the water inlet, and the installation of the device is completed.

[0044] During the use of the device, domestic sewage generated by each household in the natural village is introduced into the inlet through the sewage drain pipe, and then into the storage tank 1. The sewage entering the storage tank 1 is directly exposed on the soil on the filter plate 22. Due to the interception of the soil and filter plate 22, the debris such as vegetable scraps and feces in the sewage are trapped on top of the soil and stored there, while the water seeps through the soil and falls into the bottom of the storage tank 1 through the holes in the filter plate 22. When the vegetable garden needs watering, the operator turns the knob 321 to push the filter plate 22 and piston plate 23 upward. Due to the mutual abutment between the square rod 332 and the cylinder cover 21, the collar 41 and the filter plate 22, the filter plate 22 and the collar 41 cannot move upward. At the same time, due to the mutual abutment between the ball bearing 45 and the inner wall of the positioning groove 43, it can move along the roller. The outer arc wall of the ball 45 squeezes the ball 45 out of the positioning groove 43, so that the rotating threaded rod 31 drives the collar 41 to rotate freely in the filter plate 22. The position of the filter plate 22 remains unchanged, while the piston plate 23 slowly moves up to push the water at the bottom of the storage cylinder 1 upward. When the water level in the storage cylinder 1 moves to below the filter plate 22, the water flow through the holes and gaps of the filter plate 22 is extremely small, so most of the water is pushed out of the storage cylinder 1 through the pressure relief valve 24. The water pushed out through the pressure relief valve 24 is directly injected into the soil in the vegetable garden to replenish the water in the soil, thus completing the irrigation of the vegetable garden. After the irrigation of the vegetable garden is completed, the operator turns the knob 321 in the opposite direction to make the piston plate 23 move down to reset. The remaining water is still stored at the bottom of the storage cylinder 1.

[0045] During the storage of debris trapped on the top side of filter plate 22, due to the closed environment inside storage cylinder 1, the debris ferments inside storage cylinder 1, causing the temperature inside storage cylinder 1 to rise. At this time, some water at the bottom of storage cylinder 1 evaporates into water vapor. Since the pressure relief valve 24 cannot generate a sufficient pressure difference, the water vapor will not be discharged from the pressure relief valve 24. However, due to the pressure difference between the top and bottom of storage cylinder 1, the water vapor flows into the top of storage cylinder 1 through the holes of filter plate 22 and the gaps between debris. During the process of water vapor passing through debris, some water vapor condenses into water and dissolves in the debris to replenish the moisture in the debris. Subsequently, the remaining water vapor is discharged through one-way valve 25 to the surrounding area of ​​the top of storage cylinder 1. After the water vapor comes into contact with the vegetables in the vegetable garden, most of the water vapor condenses on the vegetables and drips onto the surface of the vegetable garden to replenish the moisture in the soil near the vegetable garden, simulating the drip irrigation operation of the vegetable garden.

[0046] After the waste in the storage cylinder 1 has fermented into fertilizer, the operator unscrews the cylinder cover 21 and then turns the knob 321 to push the filter plate 22 upward. As the cylinder cover 21 is removed, the mutual contact between the square rod 332 and the cylinder cover 21 disappears. During the upward movement of the filter plate 22, the square rod 332 moves upward in the sliding groove 331 at the same time to release the limiting constraint state of the filter plate 22. When the waste on the filter plate 22 is close to the top opening of the storage cylinder 1, the operator uses a shovel or manure scoop or other tools to take out the fertilizer from the top opening of the storage cylinder 1 for use.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A natural village sewage purification device comprising a storage cylinder (1), characterized in that: The storage cylinder (1) is internally provided with a purification assembly (2), the purification assembly (2) includes a cylinder cover (21), the cylinder cover (21) is threadedly arranged in the top opening of the storage cylinder (1), the filter plate (22) and the piston plate (23) are slidably arranged in the storage cylinder (1) from top to bottom, a plurality of pressure limiting valves (24) are fixedly and penetratively arranged on the outer circumferential wall of the middle part of the storage cylinder (1) in a circumferential array, a plurality of one-way valves (25) are fixedly and penetratively arranged on the outer circumferential wall of the top of the storage cylinder (1) in a circumferential array. The storage cylinder (1) is provided with an adjusting mechanism (3) for adjusting the vertical position of the filter plate (22) and the piston plate (23). A connecting mechanism (4) is arranged at the central position in the filter plate (22) for power connection between the filter plate (22) and the adjusting mechanism (3).

2. A natural village sewage purification device according to claim 1, characterized in that: A plurality of limiting blocks (5) are arranged in a circumferential array on the bottom side of the filter plate (22), and each limiting block (5) is fixedly connected with the inner wall of the storage cylinder (1), and the pressure limiting valve (24) is located below the limiting block (5).

3. A natural village sewage purification device according to claim 2, characterized in that: The adjusting mechanism (3) includes a threaded rod (31), the threaded rod (31) is vertically arranged at the axial position in the storage cylinder (1), the bottom end of the threaded rod (31) is threadedly penetrated through the piston plate (23) and inserted into the cylinder wall of the storage cylinder (1) and rotationally connected with the cylinder wall of the storage cylinder (1), two guide rods (34) are oppositely arranged on the outer circumferential side of the threaded rod (31), and the bottom end of each guide rod (34) is fixedly connected with the inner bottom wall of the storage cylinder (1), the guide rods (34) are slidably penetrated through the filter plate (22) and the piston plate (23), a driving member (32) is arranged on the outer circumferential side of the top of the threaded rod (31), and a limiting member (33) is arranged in the threaded rod (31).

4. A natural village sewage purification device according to claim 3, characterized in that: The connecting mechanism (4) includes a sleeve ring (41), the sleeve ring (41) is threadedly sleeved on the outer circumferential side of the threaded rod (31), and the sleeve ring (41) is rotationally penetrated through the filter plate (22), a plurality of gas storage grooves (42) are oppositely arranged on the outer circumferential wall of the sleeve ring (41), a positioning groove (43) in the shape of a quarter of a sphere is arranged on the filter plate (22) at the position corresponding to the gas storage groove (42), a piston rod (44) is slidably arranged in the gas storage groove (42), a ball (45) is rotationally arranged in the piston rod (44), and the end of the ball (45) close to the corresponding positioning groove (43) is inserted into the corresponding positioning groove (43) and in contact with the inner wall of the corresponding positioning groove (43).

5. A natural village sewage purification device according to claim 4, characterized in that: The driving piece (32) comprises a knob (321) which is arranged through the top side of the storage cylinder (1) and is located on the outer circumferential side of the cylinder cover (21), the bottom end of the knob (321) is fixedly provided with a gear (322), the gear (322) is in clearance fit with the inner wall of the storage cylinder (1), the outer circumferential side of the top end of the threaded rod (31) is sleeved with a tooth ring (323), the inner ring wall of the tooth ring (323) is rotatably connected with the inner wall of the storage cylinder (1) through a bearing, the tooth ring (323) is in meshing connection with the gear (322), and the top end of the threaded rod (31) is fixedly connected with the inner ring wall of the tooth ring (323) through a plurality of connecting rods (324).

6. A natural village sewage purification device according to claim 5, characterized in that: The limiting piece (33) comprises a square rod (332) which is arranged in the shape of an L letter, the top end of the threaded rod (31) is provided with a sliding groove (331), the bottom of the square rod (332) is inserted into the sliding groove (331) and is in sliding connection with the inner wall of the sliding groove (331), and the upper and lower ends of the square rod (332) are respectively in contact with the bottom side of the cylinder cover (21) and the top side of the filter plate (22).

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