An air purifier for chemical waste gas used to protect the environment

Abstract

This invention relates to the field of waste gas treatment technology, and more particularly to an air purifier for chemical waste gas used in environmental protection. The purifier includes a housing, a transmission assembly, filter media, rubber air bladders, and a cleaning assembly. The transmission assembly for filtering waste gas is housed within the housing. Several filter media for filtering waste gas are rotatably connected inside the housing. The transmission assembly is connected to the filter media. Each filter media has a rubber air bladder connected to its underside to enhance the pulse cleaning effect. Each rubber air bladder has an air nozzle. The cleaning assembly for pulse cleaning is located on the housing. This invention achieves the effect of opening the folded layers on the filter media by a lever, and simultaneously, the vibration generated when the filter media contacts the lever shakes off clumps of dust accumulated in the folded layers, reducing dust accumulation in the filter media folded layers, enhancing the air permeability of the filter media, and improving the treatment rate of chemical waste gas.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and in particular to an air purifier for chemical waste gas used to protect the environment. Background Technology

[0002] Pulse jet cleaning industrial dust collectors are high-efficiency and reliable industrial dust removal equipment, mainly used to treat industrial waste gas containing dust impurities, remove dust from the gas to purify the air and protect the environment. This type of dust collector removes the dust accumulated on the surface of the filter material through short bursts of compressed air (i.e., pulse cleaning), thereby keeping the filter bags clean and achieving high-efficiency filtration.

[0003] When using existing pulse-jet industrial dust collectors to clean industrial dust, some dust collectors use HEPA filter media inside. To increase the dust interception and filtration area, HEPA filter media is usually in a multi-layered, fine, longitudinally folded state to increase the capture effect of particulate matter. However, during the dust interception process, dust gradually accumulates in the folded layers on the outside of the filter media, causing the filtration area to gradually decrease and reducing the treatment efficiency of industrial waste gas.

[0004] Furthermore, in existing pulse-jet cleaning industrial dust collectors, when pulse-jet cleaning the filter media, because the pulse airflow is instantaneous, when the pulse airflow impacts the filter media from the inside out, some of the folded layers on the inside of the filter media overlap, causing dust to be trapped in the folded layers on the outside of the filter media and unable to be blown off by the airflow, thus reducing the pulse-jet cleaning effect on the filter media. Summary of the Invention

[0005] To overcome the shortcomings of existing pulse-jet industrial dust collectors where the filter media is easily clogged by dust in the exhaust gas, reducing the treatment efficiency of industrial exhaust gas, and where the folded layers on the outside of the filter media are squeezed and stacked during cleaning, preventing dust from falling off the filter media and reducing the cleaning effect, this invention provides a chemical exhaust gas air purifier for environmental protection.

[0006] The technical solution of the present invention is as follows: a chemical waste gas air purifier for environmental protection, comprising a housing; an air inlet pipe provided on the housing; an exhaust pipe provided on the housing; the exhaust pipe being higher than the air inlet pipe; a waste discharge port provided at the bottom of the housing; further comprising a transmission assembly, filter media, rubber airbags, and a cleaning assembly; a transmission assembly for filtering waste gas is provided inside the housing; several filter media for filtering waste gas are rotatably connected inside the housing; the transmission assembly is connected to the filter media; a rubber airbag for enhancing the pulse cleaning effect is connected to the lower side of each filter media; an air nozzle is provided on each rubber airbag; and a cleaning assembly for performing pulse cleaning is provided on the housing.

[0007] As a preferred embodiment of the present invention, the transmission assembly includes a motor, a gear, and a gear ring; the motor is fixedly connected inside the housing; a gear is fixedly connected to the output end of the motor; a gear ring is fixedly connected to the upper part of each filter material; and each gear ring meshes with a gear.

[0008] As a preferred embodiment of the present invention, the cleaning assembly includes a drive unit, a cover plate, pulse valves, an air tank, rubber hoses, and air blowing pipes; several drive units are fixedly connected to the upper side of the housing; a cover plate is fixedly connected to the telescopic ends of all drive units; the cover plate is located above all filter media; several pulse valves for pulse cleaning of the filter media are fixedly connected to the cover plate; each pulse valve is located inside the corresponding filter media; several air blowing pipes are fixedly connected to the cover plate; each air blowing pipe is located in the middle of the inner side of the filter media; each air blowing pipe is located directly above the corresponding rubber air bladder, and the air is cleaned by blowing... The trachea descends and is inserted into the rubber airbag, which inflates it, causing the airbag to expand the folds on the filter material. A gas tank for storing pulse gas is fixed to the housing. The gas tank is connected to an external air pump. Several rubber hoses are fixed to and connected to the gas tank. Several transmission pipes are connected to each rubber hose. Each transmission pipe is connected to a pulse valve. A solenoid valve is installed on each transmission pipe. An air delivery pipe is connected to each rubber hose. Each air delivery pipe is connected to an air blowing pipe. A solenoid valve is installed on each air delivery pipe.

[0009] As a preferred embodiment of the present invention, it further includes an annular tube; each air blowing tube is fixedly connected to and connected to an annular tube for enhancing the cleaning effect on the filter material; and a number of air outlets are provided on the lower side of the annular tube.

[0010] As a preferred embodiment of the present invention, it further includes a guide; a guide for guiding the air tube to connect with the air nozzle is fixedly attached to the upper side of the nozzle of each rubber airbag.

[0011] As a preferred embodiment of the present invention, the upper and lower parts of each rubber airbag are made of low-elasticity material, so that the longitudinal expansion range of the rubber airbag is small.

[0012] As a preferred embodiment of the present invention, it further includes a pry bar; a plurality of pry bars for prying open the filter media folds are fixedly connected to the upper side of each annular tube; each pry bar is engaged in the corresponding filter media fold.

[0013] As a preferred embodiment of the present invention, two air intake pipes are provided; each air intake pipe is connected to the left and right sides of the housing.

[0014] As a preferred embodiment of the present invention, it further includes a partition; a partition for protecting the gear and gear ring is slidably connected inside the housing; the partition is located below the gear and all gear rings; each filter material passes through the partition vertically.

[0015] As a preferred embodiment of the present invention, it further includes protrusions and elastic elements; a plurality of protrusions are fixedly connected to the lower side of the gear; a plurality of protrusions are provided in the middle of the upper side of the partition plate; a plurality of elastic elements are fixedly connected to the upper side of the partition plate; each elastic element is fixedly connected to the inside of the housing.

[0016] Beneficial effects: This invention enables the folded layers on the filter material to be opened by a prying plate. At the same time, the vibration generated when the filter material comes into contact with the prying plate shakes off the dust clumps accumulated in the folded layers of the filter material, reducing the accumulation of dust in the folded layers of the filter material, enhancing the air permeability of the filter material, and improving the treatment rate of chemical waste gas.

[0017] During the expansion process, the rubber airbag causes the lower end of the filter material to expand, so that the filter material as a whole is shaped into a frustum, which in turn unfolds the folded layers on the filter material, making it easier for the subsequent pulse airflow to blow off the dust and impurities accumulated in the folded layers of the filter material.

[0018] By using baffles to block chemical waste gas, some dust and impurities in the chemical waste gas are prevented from adhering to the gears and gear rings, thus avoiding a reduction in the meshing effect between the gears and gear rings, thereby reducing wear between the gears and gear rings and extending the service life of the equipment.

[0019] The bumps cause the baffle to vibrate continuously within the chamber, which helps to shake off the dust and impurities adhering to the underside of the baffle. This prevents the dust and impurities adhering to the underside of the baffle from being quickly adsorbed onto the filter media during the next filtration cycle, thus avoiding the accelerated clogging of the filter media by dust. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first perspective three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the second perspective three-dimensional structure of the present invention;

[0022] Figure 3 This is a three-dimensional structural diagram of the combined housing, rubber airbag, filter material, transmission assembly, cleaning assembly, and partition of the present invention.

[0023] Figure 4 This is a three-dimensional structural diagram of the rubber airbag, filter material, transmission assembly, guide, and partition plate combination of the present invention.

[0024] Figure 5 This is a three-dimensional structural diagram of the transmission assembly, cleaning assembly, and partition plate assembly of the present invention;

[0025] Figure 6 This is a three-dimensional structural diagram of the filter material, rubber airbag, deflector, annular tube, and guide assembly of the present invention.

[0026] Figure 7This is a top view of the assembly of the deflector, filter material, air blowing pipe, and annular pipe of the present invention;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the motor, gear, partition and protrusion combination of the present invention.

[0028] The markings in the diagram are as follows: 1-box body, 1001-inlet pipe, 1002-exhaust pipe, 1003-exhaust port, 2-rubber airbag, 2001-air nozzle, 3-dial plate, 101-filter media, 102-motor, 103-gear, 104-gear ring, 201-drive component, 202-cover plate, 203-pulse valve, 204-air tank, 205-rubber hose, 20501-transmission pipe, 20502-air supply pipe, 206-air blowing pipe, 207-ring pipe, 301-guide, 401-partition plate, 40101-protrusion, 501-bulge, 502-elastic component. Detailed Implementation

[0029] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0030] Example 1

[0031] like Figures 1-7 As shown, a chemical waste gas air purifier for environmental protection includes a housing 1; an air inlet pipe 1001 is provided on the housing 1; an exhaust pipe 1002 is provided on the housing 1; the height of the exhaust pipe 1002 is higher than that of the air inlet pipe 1001; and a waste discharge port 1003 is provided at the bottom of the housing 1.

[0032] It also includes a transmission assembly, filter media 101, rubber airbags 2, and a cleaning assembly; the transmission assembly is installed inside the housing 1; several filter media 101 arranged in a ring array are rotatably connected inside the housing 1, and the filter media 101 are made of HEPA material; the transmission assembly is connected to the filter media 101; a rubber airbag 2 is connected to the lower side of each filter media 101; each rubber airbag 2 is provided with an air nozzle 2001; and a cleaning assembly is provided on the housing 1.

[0033] The transmission assembly includes a motor 102, a gear 103, and a gear ring 104; the motor 102 is fixedly connected inside the housing 1; the gear 103 is fixedly connected to the output end of the motor 102; a gear ring 104 is fixedly connected to the upper part of each filter material 101; each gear ring 104 meshes with the gear 103.

[0034] The cleaning assembly includes a drive unit 201, a cover plate 202, a pulse valve 203, an air tank 204, a rubber hose 205, and an air blowing pipe 206. Two symmetrically arranged drive units 201, which are electric push rods, are fixedly attached to the upper side of the housing 1. A cover plate 202 is fixedly attached to the telescopic ends of all drive units 201. The cover plate 202 is located above all filter media 101. Several pulse valves 203 are fixedly attached to the cover plate 202. Each pulse valve 203 is located inside the corresponding filter media 101. Several air blowing pipes 206 are fixedly attached to the cover plate 202. Each air blowing pipe 206 is located in the middle of the inner side of the filter media 101. 206 are all located directly above the corresponding rubber airbag 2; an air tank 204 is fixedly connected to the housing 1; the air tank 204 is connected to an external air pump; four symmetrical rubber hoses 205 are fixedly connected to and connected to the air tank 204; each rubber hose 205 is connected to several transmission pipes 20501; each transmission pipe 20501 is connected to a pulse valve 203; each transmission pipe 20501 is equipped with a solenoid valve; each rubber hose 205 is connected to an air supply pipe 20502; each air supply pipe 20502 is connected to an air blowing pipe 206; each air supply pipe 20502 is equipped with a solenoid valve.

[0035] It also includes an annular tube 207; each air blowing tube 206 is fixedly connected to and connected to an annular tube 207 on its lower side; the lower side of the annular tube 207 is provided with several air outlets arranged in an annular array.

[0036] It also includes a guide 301; a guide 301 is fixedly attached to the upper side of the nozzle 2001 of each rubber airbag 2.

[0037] To ensure that the lateral expansion of the rubber airbag 2 is greater than the longitudinal expansion, and to enhance the expansion effect of the rubber airbag 2 on the folded layer of the filter material 101, the upper and lower parts of each rubber airbag 2 are made of low-elasticity material.

[0038] It also includes a lever plate 3; several lever plates 3 arranged in a ring array are fixedly attached to the upper side of each annular tube 207; each lever plate 3 is inserted into the folded layer of the corresponding filter material 101.

[0039] To ensure that the dust in the exhaust gas adheres evenly to the filter material 101 and to prevent local blockage of the filter material 101, two air inlet pipes 1001 are provided; each air inlet pipe 1001 is connected to the left and right sides of the housing 1.

[0040] This invention solves the problem in existing systems where, due to the longitudinal folding of the filter material 101, dust gradually accumulates in the outer folded layers of the filter material 101 during the interception of dust in chemical waste gas, resulting in a gradual decrease in filtration area and reduced dust removal efficiency. The specific process is as follows:

[0041] When using a pulse-jet industrial dust collector to treat chemical waste gas, the external extraction equipment is first controlled to draw air from the exhaust pipe 1002 into the housing 1, creating a negative pressure inside the housing 1. This draws the chemical waste gas into the housing 1 through the inlet pipe 1001. Once inside the housing 1, the chemical waste gas comes into contact with the filter media 101, where dust particles are intercepted and moved to the outside of the filter media 101. The filtered gas then flows upwards from the center of the filter media 101 to the underside of the cover plate 202, and is finally drawn into the subsequent waste gas treatment process through the exhaust pipe 1002. During the dust interception process in the air, the control motor 102 drives the gear 103 to rotate, which in turn drives the filter material 101 to rotate through the gear ring 104. During the rotation of the filter material 101, each fold layer on the filter material 101 passes through each deflector 3 in sequence. The deflector 3 opens up the fold layers on the filter material 101. At the same time, the vibration generated when the filter material 101 contacts the deflector 3 shakes off the dust clumps accumulated in the fold layers of the filter material 101, reducing the accumulation of dust in the fold layers of the filter material 101, enhancing the air permeability of the filter material 101, and improving the treatment rate of chemical waste gas.

[0042] This invention utilizes the lateral expansion of the rubber airbag 2 to cause the bottom of the filter material 101 to expand laterally, opening up the folded layers on the filter material 101. This solves the problem that, due to the small spacing between the folded layers on the filter material 101, during pulse cleaning, the inner folded layers of the filter material 101 are squeezed and stacked together by the pulse airflow, causing the outer folded layers of the filter material 101 to be squeezed and stacked together, resulting in dust being trapped inside the outer folded layers and unable to be blown off by the airflow, thus reducing the cleaning effect on the filter material 101. The specific process is as follows:

[0043] When a large amount of dust accumulates on the outside of the filter material 101, reducing its air permeability, the air intake pipe 1001 and exhaust pipe 1002 are closed. Then, the control drive 201 lowers the cover plate 202 inside the housing 1, causing the cover plate 202 to move together with the pulse valve 203 to adhere to the upper side of the filter material 101. During the descent of the cover plate 202 and the pulse valve 203, the cover plate 202 also lowers the air blowing pipe 206 and the annular pipe 207 together, causing the air blowing pipe 206 to move closer to the rubber airbag 2. During this process, the guide 301 guides and calibrates the air blowing pipe 206 so that it is inserted into the air nozzle 2001, preventing the air blowing pipe 206 from failing to properly connect with the air nozzle 2001.

[0044] After the air blowing pipe 206 is inserted into the air nozzle 2001, the solenoid valve on the air supply pipe 20502 is opened. Then, the external air pump is controlled to pump gas into the air storage tank 204. After entering the air storage tank 204, the gas is gradually transported through the rubber hose 205 to the air supply pipe 20502, and then through the air supply pipe 20502 and the air blowing pipe 206 into the rubber air bladder 2, causing the rubber air bladder 2 to gradually expand laterally. During the expansion process, the rubber air bladder 2 drives the lower end of the filter material 101 to expand laterally, causing the filter material 101 to transform into a frustum shape. This unfolds the folded layers on the filter material 101, facilitating the subsequent pulsed airflow to blow away the dust and impurities accumulated in the folded layers of the filter material 101. After the layers are unfolded, the solenoid valve on the control transmission pipe 20501 opens, and the control air tank 204 instantly pressurizes the inside of the rubber hose 205, so that the high-pressure gas opens the pulse valve 203 through the transmission pipe 20501, and the pressurized gas is sprayed out to the inside of the deformed filter material 101 to back-flush and clean the unfolded folded layers on the filter material 101. This prevents the folded layers on the filter material 101 from being squeezed and stacked by the pulse airflow, and avoids dust being trapped in the outer folded layers of the filter material 101 and unable to be blown off by the airflow. This enhances the pulse back-flushing cleaning effect on the filter material 101. The dust and impurities blown off the filter material 101 fall downwards and are discharged from the discharge port 1003 to the dust collection equipment for collection.

[0045] When the deformed filter media 101 is cleaned by pulse backflushing, part of the airflow enters the annular pipe 207 through the air blowing pipe 206, and then blows out from the air outlet on the annular pipe 207 towards the lower part of the filter media 101 where it contacts the rubber airbag 2. This solves the problem that the cleaning effect of the pulse airflow ejected from the pulse valve 203 on the lower part of the filter media 101 is low because the lower part of the filter media 101 is far away from the pulse valve 203, and further enhances the pulse backflushing cleaning effect on the filter media 101.

[0046] After the pulse backflushing cleaning of the filter media 101 is completed, the control drive 201 drives the cover plate 202 and pulse valve 203 to rise and separate from the upper side of the filter media 101. During the rising process, the cover plate 202 drives the air blowing pipe 206 to be pulled out from the air nozzle 2001, so that the air blowing pipe 206 is separated from the rubber air bag 2. Then, the external air extraction equipment is controlled to draw the chemical waste gas into the box 1 through the exhaust pipe 1002, and the chemical waste gas is drawn into the box 1 through the air inlet pipe 1001 to continue the chemical waste gas treatment.

[0047] Example 2

[0048] Based on Example 1, such as Figures 3-5 and Figure 8As shown, it also includes a partition 401; the partition 401 is slidably connected inside the housing 1; the partition 401 is located below the gear 103 and all the gear rings 104; each filter material 101 passes through the partition 401 vertically.

[0049] It also includes protrusions 501 and elastic elements 502; several protrusions 501 arranged in a ring array are fixedly connected to the lower side of the gear 103; several protrusions 40101 arranged in a ring array are provided in the middle of the upper side of the partition 401; several elastic elements 502 arranged in a ring array are fixedly connected to the upper side of the partition 401, and the elastic elements 502 are springs; each elastic element 502 is fixedly connected to the inside of the housing 1.

[0050] Furthermore, considering that during the process where motor 102 drives gear 103 to rotate, causing gear 103 to drive filter media 101 to rotate via gear ring 104, some dust and impurities in the chemical waste gas adhere to gear 103 and gear ring 104, resulting in a reduced meshing effect between gear 103 and gear ring 104 and exacerbating wear between them, the specific solution is as follows:

[0051] When filtering chemical waste gas, after the chemical waste gas enters the housing 1, it is blocked by the partition 401 to prevent some dust and impurities in the chemical waste gas from adhering to the gear 103 and the gear ring 104, thereby avoiding a reduction in the meshing effect between the gear 103 and the gear ring 104, and thus reducing the wear between the gear 103 and the gear ring 104 and extending the service life of the equipment.

[0052] The motor 102 drives the gear 103 to rotate, which in turn drives the filter media 101 to rotate via the gear ring 104. The gear 103 also drives the protrusion 501 to rotate. When the protrusion 501 rotates to contact the protrusion 40101, it presses the protrusion 40101 downwards, thereby pressing the partition 401 downwards and simultaneously stretching the elastic element 502. After the protrusion 501 rotates past the protrusion 40101, the protrusion 40101 loses the pressure from the protrusion 501, causing the partition 401 to spring back upwards under the elastic force of the elastic element 502. This process of repeated pressing of the protrusion 40101 by the protrusion 501 completes the process. The continuous vibration of the baffle 401 within the housing 1 helps to shake off the dust and impurities adhering to the lower side of the baffle 401. After cleaning the filter media 101, when continuing the filtration process, this prevents the dust and impurities adhering to the lower side of the baffle 401 from being quickly adsorbed onto the filter media 101, thus avoiding an accelerated cycle of dust clogging of the filter media 101. While the baffle 401 vibrates, it also causes the filter media 101 to vibrate, which helps to shake off the dust and impurities accumulated in the outer folded layer of the filter media 101, reducing the accumulation of dust in the folded layer of the filter media 101, enhancing the air permeability of the filter media 101, and further improving the treatment rate of chemical waste gas.

[0053] It should be understood that the above description is for illustrative purposes only and is not intended to limit the invention. Those skilled in the art will understand that variations of the invention are included within the scope of the claims herein.

Claims

1. A chemical waste gas air purifier for environmental protection, comprising a housing (1); an air inlet pipe (1001) is provided on the housing (1); an exhaust pipe (1002) is provided on the housing (1); the height of the exhaust pipe (1002) is higher than the height of the air inlet pipe (1001); and a waste discharge port (1003) is provided at the bottom of the housing (1); characterized in that: It also includes a transmission assembly, filter media (101), rubber airbags (2) and a cleaning assembly; the housing (1) is equipped with a transmission assembly for filtering exhaust gas; several filter media (101) for filtering exhaust gas are rotatably connected inside the housing (1); the transmission assembly is connected to the filter media (101); each filter media (101) is connected to a rubber airbag (2) for enhancing the pulse cleaning effect on its lower side; each rubber airbag (2) is equipped with an air nozzle (2001); the housing (1) is equipped with a cleaning assembly for pulse cleaning; The cleaning assembly includes a drive unit (201), a cover plate (202), a pulse valve (203), an air tank (204), a rubber hose (205), and an air blowing pipe (206). Several drive units (201) are fixedly connected to the upper side of the housing (1). A cover plate (202) is fixedly connected to the telescopic ends of all drive units (201). The cover plate (202) is located above all filter media (101). Several pulse valves (203) for pulse cleaning of the filter media (101) are fixedly connected to the cover plate (202). Each pulse valve (203) is located inside the corresponding filter media (101). Several air blowing pipes (206) are fixedly connected to the cover plate (202). Each air blowing pipe (206) is located in the middle of the inner side of the filter media (101). Each air blowing pipe (206) is located directly above the corresponding rubber air bladder (2). (206) The rubber airbag (2) is lowered and inflated, causing the rubber airbag (2) to expand the folded layer on the filter material (101); a gas storage tank (204) for storing pulse gas is fixedly connected to the box (1); the gas storage tank (204) is connected to an external air pump; several rubber hoses (205) are fixedly connected to and connected to the gas storage tank (204); several transmission pipes (20501) are connected to each rubber hose (205); each transmission pipe (20501) is connected to a pulse valve (203); a solenoid valve is installed on each transmission pipe (20501); a gas delivery pipe (20502) is connected to each rubber hose (205); each gas delivery pipe (20502) is connected to a blowing pipe (206); a solenoid valve is installed on each gas delivery pipe (20502); It also includes an annular tube (207); each air blowing tube (206) is fixedly connected to and connected to an annular tube (207) for enhancing the cleaning effect on the filter material (101); the annular tube (207) has several air outlets on its lower side; It also includes a pry bar (3); several pry bars (3) for prying open the folded layers of filter material (101) are fixedly attached to the upper side of each annular tube (207); each pry bar (3) is inserted into the folded layer of the corresponding filter material (101).

2. The air purifier for chemical waste gas used to protect the environment according to claim 1, characterized in that: The transmission assembly includes a motor (102), a gear (103) and a gear ring (104); the motor (102) is fixed inside the housing (1); the gear (103) is fixed to the output end of the motor (102); a gear ring (104) is fixed to the upper part of each filter material (101); each gear ring (104) meshes with the gear (103).

3. The air purifier for chemical waste gas used to protect the environment according to claim 2, characterized in that: It also includes a guide (301); a guide (301) is fixed to the upper side of the nozzle (2001) of each rubber airbag (2) for guiding the air tube (206) to connect with the nozzle (2001).

4. The air purifier for chemical waste gas used to protect the environment according to claim 3, characterized in that: The upper and lower parts of each rubber airbag (2) are made of low-elasticity material, which makes the longitudinal expansion range of the rubber airbag (2) smaller.

5. A chemical waste gas air purifier for environmental protection according to claim 4, characterized in that: It also includes a partition (401); the housing (1) has a partition (401) slidably connected inside for protecting the gear (103) and the gear ring (104); the partition (401) is located below the gear (103) and all the gear rings (104); each filter material (101) passes through the partition (401) vertically.

6. The air purifier for chemical waste gas used to protect the environment according to claim 5, characterized in that: It also includes protrusions (501) and elastic elements (502); several protrusions (501) are fixedly connected to the lower side of the gear (103); several protrusions (40101) are provided in the middle of the upper side of the partition (401); several elastic elements (502) are fixedly connected to the upper side of the partition (401); each elastic element (502) is fixedly connected to the inside of the housing (1).

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