CN110193241B

CN110193241B - MNS type cubical switchboard filter screen cleaning device

Info

Publication number: CN110193241B
Application number: CN201910548014.XA
Authority: CN
Inventors: 史运周; 张素平
Original assignee: Xuzhou Tianjin Electrical Equipment Co ltd
Current assignee: Xuzhou Tianjin Electrical Equipment Co.,Ltd.
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2021-06-08
Anticipated expiration: 2039-06-24
Also published as: CN110193241A

Abstract

The invention provides a MNS type switch cabinet filter screen cleaning device which effectively solves the problems that the existing switch cabinet filter screen is inconvenient to clean, dust is easy to drift, the cleaning is not thorough, the maintenance workload is large, the cleaning efficiency is low, and the maintenance cost is high in the cleaning process; the technical scheme for solving the problem is that the heat dissipation device comprises a main body, wherein heat dissipation holes are formed in the main body, a cover plate is arranged on the main body, and through holes are formed in the cover plate; the main body is provided with a vent, a filter screen is arranged in the vent, racks are arranged on two sides of the vent, a shell is arranged on the outer side of the vent, a rotating shaft is arranged in the shell, a strip plate is arranged at the rear end of the rotating shaft, a hard fiber forming brush is arranged on one side of the strip plate, a first gear is arranged on the shell, and a first bevel gear is arranged in the first gear shell; a pinion is arranged on the rotating shaft, a second gear is arranged on the front side of the shell, and a second bevel gear is arranged in the cavity of the shell; the casing front side has the rectangle box, and the rectangle box has the cylinder shell through a plurality of pipelines and casing intracavity intercommunication, has a plurality of flabellums in the rectangle box, has the ventilation hole in the rectangle box, and there is the baffle the ventilation hole outside.

Description

MNS type cubical switchboard filter screen cleaning device

Technical Field

The invention relates to the technical field of power distribution cabinets, in particular to a MNS type switch cabinet filter screen cleaning device.

Background

In the places with large power consumption and various equipment, such as large-scale factories and large-scale power stations, power distribution cabinets, lighting distribution cabinets, metering cabinets and the like are divided according to functions, so that a plurality of power distribution cabinets are often arranged together for convenience of control and centralized processing, and even a special factory building can be built for the power distribution cabinets. The switch board need keep ventilating with the external world in the use, and ventilation equipment is in its use, and the filter screen of draught fan (forced draught blower) entrance is very volume accumulation dust, uses for a long time easily to lead to the ventilation efficiency to reduce, and indoor long time ventilation is not enough very easily causes the high temperature, causes equipment failure to and lead to the air dirty.

Therefore, the inside and the outside of the power distribution cabinet need to be cleaned regularly in the using process, the side wall of the cabinet body and the filter screen on the side wall need to be cleaned outside, in the prior art, the vent on the cabinet body adopts an iron filter screen, and two methods are adopted for cleaning.

Still some ventilation equipment departments adopt two louver grids and press from both sides the filter screen of packing one deck nylon fiber synthetic resin in the middle of, need when clearing up the filter screen to pull down the screw on the louver grid in the outside one by one, take off the louver grid in the outside and change the intermediate layer filter screen in the middle of, then install outer louver grid, need to twist repeatedly and twist the screw, it is lower to change efficiency to twist repeatedly the in-process, some screws can become invalid, just need to punch the installation again this moment, it is comparatively troublesome.

In the aspect of cleaning the filter screen, some brushes are matched with a dust collector to remove dust, for example, in the patent document with the application number of 201410803451.9, the cleaning brushes are used for removing dust, then the dust collector is fixed below the cleaning brushes to absorb dust, the rotating directions of the cleaning brushes and the gears in the scheme are consistent, the cleaning brushes are not thoroughly cleaned, residual dust exists, repeated operation needs to be carried out repeatedly, the efficiency is low, and the effect is poor; and the dust collector is fixed below, so that the dust can not be collected in time, and the dust is likely to fly everywhere.

To sum up, current filter screen is not convenient for clear up in the ventilation use, and the dust clearance is not thorough, and maintenance work volume is big, and cleaning efficiency is low down, can not in time collect the dust and cause the raise dust, produces adverse effect to other equipment, causes the maintenance cost of filter screen to be high.

Disclosure of Invention

Aiming at the situation, in order to overcome the defects of the prior art, the invention provides the MNS type switch cabinet filter screen cleaning device, which effectively solves the problems that the existing switch cabinet filter screen is inconvenient to clean, dust is easy to float, the cleaning is not thorough, the maintenance workload is large, the cleaning efficiency is low, and the maintenance cost is high in the cleaning process.

The technical scheme for solving the problem is that the power distribution cabinet comprises a power distribution cabinet main body, wherein a plurality of heat dissipation holes are formed in an upper side plate of the main body, a hemispherical cover plate with a downward opening is fixed on the upper side plate of the main body, the outer edge of the cover plate is fixed with the upper side plate of the switch cabinet in a sealing mode, and a through hole is formed in the top end of the cover plate; the side wall of the main body is provided with a horizontal vent, a filter screen is fixed in the vent, a horizontal rack is fixed on each of the upper side and the lower side of the vent, a rectangular shell capable of moving left and right along the vent is arranged on the outer side of the vent, the rear end of the shell is in an open shape, two rotating shafts which are arranged in the front-back direction and can rotate are arranged in the shell, a long strip plate which is perpendicular to the rotating shafts is arranged at the rear end of each rotating shaft and can move radially along the rotating shafts, the rotating shafts can drive the long strip plate to rotate by taking the rotating shafts as centers, one side of the long strip plate, which is close to the filter screen, is provided with first gears which are in one-to-one correspondence with the racks, and first bevel gears which are in; the front end of the rotating shaft penetrates through the shell and is arranged on the front side of the shell, a small gear is fixed on the part of the rotating shaft arranged on the front side of the shell, second gears which correspond to the small gears one by one are arranged on the front side of the shell, a second bevel gear which is coaxial with the second gear is arranged in the cavity of the shell, the second bevel gear can drive the second gear to rotate, and the first bevel gear is meshed with the second bevel gear;

the casing front side have the rectangle box, the rectangle box is through a plurality of pipelines and casing intracavity intercommunication, rectangle box front side is fixed with the coaxial and forward cylinder shell of opening of pivot, the pivot front end is put in the cylinder shell, be fixed with a plurality of flabellums on the part that the cylinder shell was placed in to the pivot, rectangle case front end embedding cylinder shell is interior, there is the ventilation hole in the part that rectangle box embedding cylinder shell is interior, there is the baffle with rectangle box articulated in the ventilation hole outside, opening or closing of baffle control hole, the flabellum rotation can be taken out the raise dust in the casing intracavity through the cylinder shell.

The dust and sundries cleaning device is ingenious in structure, can effectively clean dust and sundries on a filter screen of a power distribution cabinet, is convenient to operate, avoids raising dust, prevents the dust from drifting, can collect the dust and the sundries in time, facilitates maintenance of the switch cabinet, reduces labor capacity, greatly improves cleaning efficiency, and is strong in adaptability and easy to popularize.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a side cross-sectional view of the present invention.

Fig. 3 is a front view of the core mechanism of the present invention.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a front cross-sectional view of the core mechanism of the present invention.

FIG. 6 is a first three-dimensional schematic diagram of a core mechanism according to the present invention.

FIG. 7 is a second three-dimensional schematic diagram of the core mechanism of the present invention.

Detailed Description

The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1 to 7, the power distribution cabinet comprises a power distribution cabinet main body 1, a plurality of heat dissipation holes are formed in an upper side plate of the main body 1, a hemispherical cover plate 2 with a downward opening is fixed on the upper side plate of the main body 1, the outer edge of the cover plate 2 is hermetically fixed with the upper side plate of the power distribution cabinet, and a through hole is formed in the top end of the cover plate 2; the side wall of the main body 1 is provided with a horizontal vent, a filter screen is fixed in the vent, a horizontal rack 3 is fixed on each of the upper side and the lower side of the vent, a rectangular shell 4 capable of moving left and right along the vent is arranged on the outer side of the vent, the rear end of the shell 4 is in an open shape, two rotating shafts 5 which are arranged in the front and back direction and can rotate are arranged in the shell 4, a long strip plate 6 which is vertical to the rotating shafts 5 is arranged at the rear end of each rotating shaft 5, each long strip plate 6 can move along the radial direction of each rotating shaft 5, each rotating shaft 5 can drive each long strip plate 6 to rotate by taking the rotating shaft 5 as the center, one side of each long strip plate 6, which is close to the filter screen, is provided with a hard fiber forming brush, first gears 7 which are in one-to-one correspondence with the racks 3 are; the front end of the rotating shaft 5 penetrates through the shell 4 and is arranged on the front side of the shell 4, a small gear 9 is fixed on the part of the rotating shaft 5 arranged on the front side of the shell 4, second gears 10 which are in one-to-one correspondence with the small gears 9 are arranged on the front side of the shell 4, a second bevel gear 11 which is coaxial with the second gears 10 is arranged in a cavity of the shell 4, the second bevel gear 11 can drive the second gears 10 to rotate, and the first bevel gear 8 is meshed with the second bevel gear 11;

4 front sides of casing have rectangle box 12, rectangle box 12 communicates through a plurality of pipelines and 4 intracavity of casing, rectangle box 12 front side is fixed with 5 coaxial and opening forward's cylinder shells 13 of pivot, 5 front ends of pivot are put in cylinder shells 13, pivot 5 is fixed with a plurality of flabellums on the part of putting in cylinder shells 13, rectangle case front end embedding cylinder shells 13, there is the ventilation hole on the part of rectangle box 12 embedding cylinder shells 13, there is baffle 14 with rectangle box 12 articulated in the ventilation hole outside, opening or closing of baffle 14 control hole, the flabellum rotation can be taken out the raise dust in 4 intracavity of casing through cylinder shells 13.

In order to collect the raised dust in time, the front end of the cylindrical shell 13 is sleeved with a movable cylinder 15, the movable cylinder 15 is in threaded connection with the cylindrical shell 13, the front end of the movable cylinder 15 is provided with a plurality of cloth bags with backward openings, and the cloth bags are made of cloth or felt woven by synthetic fibers, natural fibers or glass fibers.

The central shaft of the first gear 7 penetrates through the side wall of the shell 4 and is coaxially fixed with the first bevel gear 8; the central shaft of the second gear 10 penetrates through the side wall of the shell 4 and is coaxially fixed with the second bevel gear 11.

In order to increase the rotating speed of the rotating shaft 5 and thus achieve the purpose of increasing the dust collection efficiency of the fan blades, the diameter of the first bevel gear 8 is larger than that of the second bevel gear 11, and the diameter of the second bevel gear 11 is far larger than that of the pinion 9.

In order to collect the raised dust in the shell 4 as soon as possible, a plurality of circles of fan blades are uniformly distributed along the axial direction of the rotating shaft 5 on the rotating shaft 5 in the first sleeve and the second sleeve, and the plurality of fan blades in each circle are uniformly distributed in a circumferential manner.

The baffle plate 14 is hinged with the shell 4 through a torsion spring.

In order to realize that the strip plate 6 can move along the radial direction of the rotating shaft 5, and filter screens with different widths can be cleaned, a T-shaped groove 16 along the axial direction of the strip plate 6 is arranged on the strip plate 6, a sliding block 17 is arranged in the T-shaped groove 16, the sliding block 17 is fixed with the end part of the rotating shaft 5, a plurality of through holes are uniformly distributed along the axial direction of the T-shaped groove 16, a positioning hole is arranged on the sliding block 17, the sliding block 17 is fixed on the strip plate 6 through a bolt, and the bolt penetrates through the positioning hole on the sliding block 17 and one of the through holes.

In order to change the filter screen, the vent in place rather than the rectangular cylinder 18 of adaptation, the main part 1 outside is placed in rectangular cylinder 18 one end, rectangular cylinder 18 is placed and is had annular arch on the outer fringe face of the outer one end in 1 chamber of main part in, annular arch and main part 1 are through a plurality of fix with screws, the one end of keeping away from main part 1 in the rectangular cylinder 18 has protruding strip, it has a plurality of blind holes to be close to one of main part 1 in the rectangular cylinder 18, a plurality of wedge 19 that can remove in the blind hole have been placed in the blind hole, be connected with the pressure spring between wedge 19 and the blind hole bottom, there is the interval between wedge 19 and the protruding strip, place the filter screen in the interval, the filter screen can enter into in the interval by one side of wedge 19.

An exhaust fan is arranged on the inner side of the ventilation opening.

It is worth noting that the cylindrical shell 13 is connected with the rear side plate of the shell 4 through a pipeline, the pipeline is made of metal, the vent hole in the rectangular box 12 is positioned at the right side of the fan blade, when the fan blade does not rotate, the baffle 14 closes the vent hole under the action of a torsion spring, when the fan blade rotates and the wind direction is forward, the baffle 14 opens, when the fan blade rotates and the wind direction is backward, the vent hole is closed by the baffle 14, so that the rotation of the fan blade can only generate negative pressure effect in the cavity of the shell 4 and can not blow into the cavity of the shell 4, the effect that the fan blade can collect the raised dust in time in the reciprocating movement process of the shell 4 is realized, and then the raised dust is filtered under the action of a cloth bag, so; in order to increase the efficiency of the fan blades for pumping air, the diameter of the cylindrical shell 13 can be increased under the condition of not interfering the normal operation of other parts, so that the efficiency of the fan blades for pumping raised dust is enhanced; the cloth bag is made of cloth or felt woven by synthetic fibers, natural fibers or glass fibers, dust and impurities are left when the raised dust passes through the cloth bag, and clean air is discharged from the cloth bag; the baffle 14 in the invention can play the role of a one-way valve, only allows the airflow to flow from the shell 4 to the inside of the cylindrical shell 13, and prevents the airflow from flowing reversely; when the filter screen is rotten or damaged, just need to change the filter screen, rectangular cylinder 18 is pulled down this moment to press wedge 19 to its corresponding blind hole in, take out just old filter screen, steadily place new filter screen on a plurality of wedge 19 and press to the interval in, new filter screen can oppress wedge 19 and move to the blind hole in, when the filter screen arrived in the interval, wedge 19 blocks new filter screen in the interval under the effect of pressure spring, install rectangular cylinder 18 on main part 1 according to the original state at last, change and accomplish.

In the initial state of the invention, the strip plate 6 at the upper side is vertical, the strip plate 6 at the lower side is horizontal, and the distance between the two rotating shafts 5 is greater than the length of the strip plate 6 between the two rotating shafts 5, so that the two strip plates 6 can not interfere with each other in the rotating process, and the width of the two brushes can be adjusted.

The pipelines are uniformly distributed on the side wall of the shell 4, so that the dust collection effect is improved, but the pipelines cannot interfere with the normal operation of other parts.

When in use, the movable cylinder 15 is firstly screwed on the cylindrical shell 13, then the device is buckled on the ventilation opening of the power distribution cabinet, the first gear 7 is meshed with the corresponding rack 3, the shell 4 drives the first gear 7 to roll leftwards on the rack 3, the first gear 7 rolls and drives the second bevel gear 11 to rotate through the first bevel gear 8, the second bevel gear 11 rotates and drives the pinion 9 to rotate through the second gear 10, the pinion 9 rotates and drives the rotating shaft 5 to rotate, the rotating shaft 5 rotates and drives the strip plate 6 to rotate, the hard fiber on the rotation of the strip plate 6 cleans the filter screen, meanwhile, the front end of the rotating shaft 5 drives a plurality of fan blades to rotate, wherein the fan blades on the upper side rotate to generate negative pressure in the shell 4, dust in the shell 4 sequentially passes through the pipeline, the rectangular box 12 and the cylindrical shell 13 on the upper side and is finally pumped into the cloth bag on the upper side, the lower spindle 5 with its fan blades rotates to direct the wind to the rear side, and the baffle 14 in the lower spindle blocks the vent hole to prevent the airflow from flowing into the housing 4. When the shell 4 moves rightwards along the rack 3, the upper rotating shaft 5 drives the fan blades to rotate, so that the air flow moves towards the rear side, the vent holes are closed by the baffle plates 14 in the shell under the action of the torsion springs, meanwhile, the lower rotating shaft 5 drives the fan blades to rotate, so that the air flow flows forwards, the vent holes in the lower portion are opened, and raised dust is pumped into the cloth bags in the lower portion.

In the process, when the shell 4 moves leftwards, the baffle 14 at the vent is opened, the raised dust is pumped into the cloth bag above, and the lower baffle 14 blocks the vent to prevent the airflow from moving backwards, so that the dust collection effect is ensured; when the shell 4 moves rightwards, the vent above is blocked by the baffle 14, the vent below is opened, the fan blades below rotate to collect the raised dust in the shell 4 into the cloth bag below, so that the negative pressure environment in the shell 4 can be always generated in the reciprocating motion process of the shell 4, and the raised dust and impurities can be collected into the cloth bag at the lower end of the movable barrel 15.

The invention has the outstanding advantages and remarkable progress that:

1. according to the invention, the rotating shaft 5 drives the strip plate 6 to rotate, so that dust and impurities on the filter screen can be cleaned by the hard fibers, a negative pressure environment in the cavity of the shell 4 is caused by the rotation of the fan blades, raised dust generated in the cleaning process is intensively pumped into the cylindrical shell 13 through the pipeline under the action of the fan blades and then is sent into the cloth bag through the cylindrical barrel, the cloth bag has a filtering function, the cloth bag leaves the dust and impurities and discharges clean air, the raised dust is avoided as far as possible, the dust is effectively prevented from escaping, and the dust and the impurities are reduced from entering the cabinet body.

2. In the invention, in the initial state, the strip plate 6 at the upper side is vertical, the strip plate 6 at the lower side is horizontal, the rotating speeds of the two strip plates 6 are consistent, and the two strip plates 6 can not interfere in the rotating process; the rectangular board 6 can be along the radial movement of the pivot 5 above that, and the regional size that can effective control clearance can adapt to the filter screen clearance of different width.

3. The cylindrical shell 13, the rotating shaft 5, the vent holes and the baffle plate 14 are arranged in two parts, so that the raised dust in the cavity of the shell 4 can be collected and pumped into a cloth bag as soon as possible no matter the shell 4 is leftwards or rightwards, and the dust and impurities in the cleaning process can be collected timely and quickly.

4. According to the invention, the diameter of the first bevel gear 8 is larger than that of the second bevel gear 11, the diameter of the second bevel gear 11 is far larger than that of the pinion 9, so that the rotating shaft 5 is ensured to have enough rotating speed, the fan blades are divided into a plurality of circles, and each circle of the fan blades is provided with a plurality of fan blades, so that the raised dust and sundries in the shell 4 can be rapidly collected in a short time, the flying escape into the cabinet is avoided, the cleaning and sanitation are realized, and the efficiency is high.

5. According to the invention, the dust and sundries on the filter screen can be cleaned without disassembling the filter screen, only two racks 3 are required to be added on the upper side and the lower side of the filter screen of the conventional power distribution cabinet, other parts can be completely separated from the power distribution cabinet, a plurality of power distribution cabinets or a plurality of filter screens are mutually universal, the carrying is convenient, and the management is convenient only by replacing or cleaning the cloth bag according to the condition.

6. Compared with the traditional cleaning mode, the dust-raising cleaning device can effectively prevent dust from raising, not only can prevent dust from entering the power distribution cabinet to cause dust deposition on electrical elements, but also can effectively protect the health of operators, greatly reduce the labor capacity of the operators and facilitate centralized treatment.

In conclusion, the dust and sundries on the filter screen of the power distribution cabinet can be effectively cleaned, the operation is convenient, the dust is prevented from flying, the dust and the sundries can be collected in time, the maintenance of the switch cabinet is convenient, the labor capacity is reduced, the cleaning efficiency is greatly improved, the adaptability is high, and the popularization is easy.

Claims

1. An MNS type switch cabinet filter screen cleaning device is characterized by comprising a switch cabinet main body (1), wherein a plurality of heat dissipation holes are formed in an upper side plate of the main body (1), a hemispherical cover plate (2) with a downward opening is fixed on the upper side plate of the main body (1), the outer edge of the cover plate (2) is hermetically fixed with the upper side plate of a switch cabinet, and a through hole is formed in the top end of the cover plate (2); a horizontal ventilation opening is arranged on the side wall of the main body (1), a filter screen is fixed in the ventilation opening, the upper side and the lower side of the ventilation opening are both fixed with a horizontal rack (3), a rectangular shell (4) capable of moving left and right along the ventilation opening is arranged on the outer side of the ventilation opening, the rear end of the shell (4) is in an open shape, two rotating shafts (5) which are arranged in the front-back direction and can rotate are arranged in the shell (4), long strips (6) perpendicular to the rotating shafts (5) are arranged at the rear ends of the rotating shafts (5), the long strips (6) can move radially along the rotating shafts (5), the rotating shafts (5) can drive the long strips (6) to rotate by taking the rotating shafts (5) as centers, one side of the long strips (6) close to a filter screen is provided with hard fiber forming brushes, first gears (7) corresponding to the racks (3) one by one are arranged on the outer side of the shell (4), and first bevel gears (8) corresponding to the first gears (7) one by one are arranged in; the front end of the rotating shaft (5) penetrates through the shell (4) and is arranged on the front side of the shell (4), a small gear (9) is fixed on the part of the rotating shaft (5) arranged on the front side of the shell (4), second gears (10) which correspond to the small gears (9) one by one are arranged on the front side of the shell (4), a second bevel gear (11) which is coaxial with the second gear (10) is arranged in a cavity of the shell (4), the second bevel gear (11) can drive the second gear (10) to rotate, and the first bevel gear (8) is meshed with the second bevel gear (11);

the dust-removing device is characterized in that a rectangular box (12) is arranged on the front side of the shell (4), the rectangular box (12) is communicated with the cavity of the shell (4) through a plurality of pipelines, a cylindrical shell (13) which is coaxial with the rotating shaft (5) and has a forward opening is fixed on the front side of the rectangular box (12), the front end of the rotating shaft (5) is arranged in the cylindrical shell (13), a plurality of fan blades are fixed on the part of the rotating shaft (5) arranged in the cylindrical shell (13), the front end of the rectangular box is embedded in the cylindrical shell (13), a vent hole is formed in the part of the rectangular box (12) embedded in the cylindrical shell (13), a baffle (14) hinged with the rectangular box (12) is arranged on the outer side of the vent hole, the baffle (14) controls the opening or closing of the hole, and the fan blades can pump out dust in the cavity of the shell;

when the flabellum does not rotate, baffle (14) are closed the ventilation hole under the torsional spring effect, when the flabellum rotated and the wind direction was forward, baffle (14) were opened, when the flabellum rotated and the wind direction was backward, baffle (14) were closed the ventilation hole, the rotation that realizes the flabellum with this can only produce the negative pressure effect to casing (4) intracavity, can not blow to casing (4) intracavity, realized at casing (4) reciprocating motion's in-process, the flabellum homoenergetic was in time collected the raise dust.

2. The MNS type switch cabinet filter screen cleaning device according to claim 1, characterized in that a movable cylinder (15) is sleeved at the front end of the cylindrical shell (1), the movable cylinder (15) is in threaded connection with the cylindrical shell (13), a plurality of cloth bags with backward openings are arranged at the front end of the movable cylinder (15), and the cloth bags are made of synthetic fibers, natural fibers or glass fibers and woven into cloth or felt.

3. The MNS type switch cabinet filter screen cleaning device according to claim 1, characterized in that the rotating shaft (5) in the first sleeve and the second sleeve is provided with a plurality of circles of blades which are uniformly distributed along the axial direction of the rotating shaft (5), and the plurality of blades in each circle are uniformly distributed in a circumferential manner.

4. The MNS type switch cabinet filter screen cleaning device as claimed in claim 1, wherein the long strip plate (6) is provided with a T-shaped groove (16) along the axial direction of the long strip plate (6), a sliding block (17) is arranged in the T-shaped groove (16), the sliding block (17) is fixed with the end portion of the rotating shaft (5), the T-shaped groove (16) is provided with a plurality of through holes uniformly distributed along the axial direction of the T-shaped groove, the sliding block (17) is provided with positioning holes, the sliding block (17) is fixed on the long strip plate (6) through bolts, and the bolts penetrate through the positioning holes in the sliding block (17) and one of the through holes.

5. The MNS type switch cabinet filter screen cleaning device according to claim 1, characterized in that, a rectangular cylinder (18) matched with the vent is placed in the vent, one end of the rectangular cylinder (18) is placed outside the main body (1), an annular bulge is arranged on the outer edge surface of one end of the rectangular cylinder (18) outside the cavity of the main body (1), the annular bulge is fixed with the main body (1) through a plurality of screws, a bulge strip is arranged at one end of the rectangular cylinder (18) far away from the main body (1), a plurality of blind holes are arranged at one end of the rectangular cylinder (18) close to the main body (1), a plurality of wedge blocks (19) capable of moving in the blind holes are placed in the blind holes, a pressure spring is connected between the wedge blocks (19) and the bottom of the blind holes, a gap is formed between the wedge blocks (19) and the bulge strip, a filter screen is placed in the gap, and the filter screen can enter the gap from one side of the wedge blocks (19.