CN219139022U - Cage type well drilling plugging device - Google Patents

Abstract

The utility model discloses a cage sleeve type well drilling plugging device which comprises a box-shaped seat and a cage sleeve fixedly connected to the top of the box-shaped seat, wherein the cage sleeve consists of four vertical supporting rods and a plurality of circular rings, the four vertical supporting rods are fixedly connected to the top of the box-shaped seat at equal intervals in an annular shape, and the plurality of circular rings are all welded and sleeved on the outer sides of the four vertical supporting rods. According to the utility model, through the arrangement of the networking controller, the driving motor, the rotary linkage assembly, the thread driving assembly and the saw-tooth supporting blocks, the four saw-tooth supporting blocks can be synchronously driven to outwards expand or inwards contract and move, so that the device can be conveniently and firmly supported and fixed in a well by using the four saw-tooth supporting blocks which outwards expand and move, the use convenience is improved, the time and the labor are saved, the working efficiency is improved, and through the arrangement of the networking controller, the air pump, the vertical pipe, the electromagnetic valve, the vent pipe and the annular plugging air bag, the annular plugging air bag is conveniently supplied with air to expand and plug the interior of the well, and the annular plugging air bag can be exhausted and removed after the annular plugging air bag is used.

Description

Cage type well drilling plugging device

Technical Field

The utility model relates to the technical field of drilling plugging equipment, in particular to a cage type drilling plugging device.

Background

In the drilling engineering, lost circulation is the phenomenon that drilling fluid leaks into a stratum from a well hole through a crack on the well wall, once lost circulation occurs, the time is delayed, the drilling fluid is lost, and well wall instability can be caused, so that a series of complex conditions and accidents such as well collapse, drilling sticking, blowout and the like are caused; in China, the lost circulation is treated by the lost circulation material as early as 60 th century of 20 th, basic research works are carried out, the development and application of the lost circulation material are greatly developed in decades, and on the basis of conventional cement lost circulation and bridging material lost circulation, tens of lost circulation materials such as a novel composite bridging lost circulation agent, a high-efficiency lost circulation agent, a temporary plugging agent, a chemical lost circulation agent, a single pressure sealing agent and the like are developed; however, the drilling may be leaked again due to high pressure difference, which results in the need of repeated construction.

In this regard, chinese patent publication No. CN207260984U discloses a cage-type well drilling plugging device, which includes a coiled tubing, an expansion sleeve, a cage and a sealing sleeve, wherein the coiled tubing is connected with the expansion sleeve; the cage sleeve comprises a cage column and a locking ring, wherein a ratchet wheel, a pawl and a clamp are respectively arranged at two ends of the locking ring, and the ratchet wheel and the pawl enable the locking ring to expand only; the sealing sleeve is sleeved outside the cage sleeve, and the expansion sleeve is positioned in the cage sleeve; hanging the whole cage sleeve on a continuous small oil pipe by using gas injection expansion of the expansion sleeve, and then sending the continuous small oil pipe to a plugging point of a well drilling; the expansion sleeve continues to inject air, and the cage sleeve and the sealing sleeve are locked on the repair and expansion section well wall cylinder; and the expansion sleeve is taken out after being exhausted, and finally, the leakage section is subjected to cement leakage blocking solidification, so that the leakage blocking position is improved, and the leakage blocking success rate is improved.

According to the patent, the well wall cylinder is repaired and expanded below the well wall position needing repairing and solidifying in advance, and then the cage type well drilling plugging device below the repaired and expanded well wall cylinder position is inflated and expanded to be at the repairing and expanding end, so that plugging is realized, the phenomenon that the pressure in the well is upwards impacted and damaged to the repairing position is prevented, but the device still has some defects:

the well wall cylinder is required to be repaired and expanded in advance before plugging so as to provide a stable environment for the plugging device, but the mode adds repair and expansion work to the well wall, adds additional work undoubtedly, and lacks a structure for fixing the plugging device in the well conveniently and fast, so that time and labor are wasted, and the working efficiency is low.

Disclosure of Invention

The utility model aims to provide a cage type well drilling plugging device which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the cage sleeve type well drilling plugging device comprises a box-shaped seat and a cage sleeve fixedly connected to the top of the box-shaped seat, wherein the cage sleeve consists of four vertical supporting rods and a plurality of circular rings, the four vertical supporting rods are fixedly connected to the top of the box-shaped seat at equal intervals in an annular shape, the plurality of circular rings are all welded and sleeved on the outer sides of the four vertical supporting rods, the outer sides of the plurality of circular rings are adhered and sleeved with the same annular plugging air bag, and the arranged annular plugging air bag is used for plugging in an inflation expansion mode after the cage sleeve is put into a well;

the top of the box-shaped seat is fixedly connected with a vertical pipe, a vent pipe is communicated and fixed between the left side of the vertical pipe and the left side of the inner side of the annular leaking stoppage air bag, the bottom of the vent pipe is communicated and fixed with an electromagnetic valve, a top box is fixedly sleeved on the vertical pipe, an air pump is fixedly installed on the inner wall of the bottom of the top box, an air outlet of the air pump extends into the vertical pipe, a networking controller is fixedly installed on the inner wall of the top box, the electromagnetic valve and the air pump are electrically connected with the networking controller, and the arranged air pump, the vertical pipe and the vent pipe are matched to be used for inflating the annular leaking stoppage air bag;

the four sides of the square seat are respectively provided with a threaded driving component in a rotating way, one end of the threaded driving component, which is far away from the square seat, extends out of the square seat and is fixedly connected with a saw-tooth supporting block, and the four threaded driving components are used for driving the four saw-tooth supporting blocks to expand outwards or contract inwards;

the four screw thread drive assembly is close one end fixedly connected with same rotatory linkage subassembly, and rotatory linkage rod assembly seals the rotation cover and establishes in the standpipe, and fixed mounting has output shaft and rotatory linkage subassembly fixed connection's driving motor on the top inner wall of top box, driving motor and networking controller electric connection, and rotatory linkage subassembly is used for synchronous drive four screw thread drive assembly rotation.

Preferably, the screw driving assembly comprises screw rods and rectangular rods, the four screw rods are respectively connected to four sides of the rectangular seat in a rotating mode, the rectangular rods are sleeved on the corresponding screw rods in a threaded mode, one end, far away from the rectangular seat, of each rectangular rod extends out of the box-shaped seat and is fixedly connected with one side, close to the box-shaped seat, of the corresponding saw-tooth supporting block, the box-shaped seat is sleeved on the four rectangular rods in a sliding mode, and one ends, close to the four screw rods, of each rectangular rod extend into the rectangular seat; the screw rods are matched with the rectangular rods, and the four rectangular rods can be driven to expand outwards or contract inwards when rotating, so that the four saw-tooth supporting blocks are driven to expand outwards or contract inwards, and the four saw-tooth supporting blocks are utilized to expand to be tightly supported and fixed with the inner wall of a well.

Preferably, the rotary linkage assembly comprises a rotating shaft, a first bevel gear and four second bevel gears, wherein the rotating shaft is hermetically sleeved in a vertical pipe in a rotating manner, the bottom end of the rotating shaft extends into a square seat and is fixedly connected with the top of the first bevel gear, the four second bevel gears are respectively meshed with the four sides of the first bevel gear, one ends, close to the four screws, of the four second bevel gears are respectively fixedly connected with one repellent side of the four second bevel gears, the two opposite second bevel gears are symmetrically arranged, and the top end of the rotating shaft is fixedly connected with the bottom end of an output shaft of the driving motor; the rotating shaft, the first bevel gear and the four second bevel gears are matched, the first bevel gear can be driven to rotate through the rotating shaft when the driving motor is started, and the four second bevel gears are driven to rotate through the first bevel gear, so that the four screws are synchronously driven to rotate.

Preferably, two rings of top fixedly connected with of top box, fixedly connected with battery on the bottom inner wall of top box, driving motor, air pump, solenoid valve and networking controller all with battery electric connection, networking controller matches and is provided with cell-phone end APP, and the networking controller of setting plays the effect that makes things convenient for personnel to driving motor, air pump and solenoid valve remote control.

Preferably, the bottom of the inner side of the annular plugging air bag is adhered and sleeved with a lower sealing plate, and the lower sealing plate is fixedly sleeved on the four vertical struts and the vertical tubes.

Preferably, the two opposite rectangular rods are provided with thread grooves at one ends close to each other, and the thread grooves are in threaded connection with the corresponding screw rods.

Preferably, the standpipe internal fixation cover is equipped with two sealed bearings, and sealed bearing's inner circle and the fixed suit in the outside of pivot, and the gas outlet and the breather pipe of air pump are located between two sealed bearings.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the cage type well drilling plugging device, the networking controller, the driving motor, the rotary linkage assembly, the threaded driving assembly and the saw tooth supporting blocks are matched, after the device is lowered to a position needing plugging in a well drilling through an external lifting rope matched lifting ring, the four saw tooth supporting blocks can be driven by the driving motor to synchronously expand outwards, wherein an extrusion supporting state can be formed on the inner wall of the well drilling by utilizing the expansion movement of the four saw tooth supporting blocks, and therefore the device is conveniently, firmly and fixedly supported in the well drilling;

2. this cage type well drilling plugging device, through networking controller, air pump, standpipe, solenoid valve, breather pipe and the annular leaking stoppage gasbag cooperation that sets up, can utilize the networking controller to control the air pump and open to annular leaking stoppage gasbag air feed, make its inflation to the shutoff in the well drilling, and can utilize the solenoid valve to exhaust after the use in order to supply annular leaking stoppage gasbag shrink to this is convenient shifts out after the use.

According to the utility model, through the arrangement of the networking controller, the driving motor, the rotary linkage assembly, the thread driving assembly and the saw-tooth supporting blocks, the four saw-tooth supporting blocks can be synchronously driven to outwards expand or inwards contract and move, so that the device can be conveniently and firmly supported and fixed in a well by using the four saw-tooth supporting blocks which outwards expand and move, the use convenience is improved, the time and the labor are saved, the working efficiency is improved, and through the arrangement of the networking controller, the air pump, the vertical pipe, the electromagnetic valve, the vent pipe and the annular plugging air bag, the annular plugging air bag is conveniently supplied with air to expand and plug the interior of the well, and the annular plugging air bag can be exhausted and removed after the annular plugging air bag is used.

Drawings

FIG. 1 is a schematic overall perspective view of the present utility model;

FIG. 2 is a schematic view of a front cross-sectional structure of the present utility model;

fig. 3 is an enlarged schematic view of the portion a in fig. 2 according to the present utility model.

In the figure: 1. a vertical strut; 2. a circular ring; 3. an annular leaking stoppage air bag; 4. a box-shaped seat; 5. a standpipe; 6. a vent pipe; 7. a rotating shaft; 8. sealing the bearing; 9. a top box; 10. an air pump; 11. a driving motor; 12. a saw tooth support block; 13. a square seat; 14. a first bevel gear; 15. a second bevel gear; 16. a screw; 17. a rectangular bar; 18. a lower sealing plate; 19. an electromagnetic valve; 20. a networked controller.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 3, the cage-sleeve type well drilling plugging device provided by the embodiment comprises a box-shaped seat 4 and a cage sleeve fixedly connected to the top of the box-shaped seat 4, wherein the cage sleeve consists of four vertical supporting rods 1 and a plurality of circular rings 2, the four vertical supporting rods 1 are fixedly connected to the top of the box-shaped seat 4 at equal intervals in a ring shape, the plurality of circular rings 2 are welded and sleeved on the outer sides of the four vertical supporting rods 1, the outer sides of the plurality of circular rings 2 are bonded and sleeved with the same ring-shaped plugging air bag 3, and the arranged ring-shaped plugging air bag 3 is used for plugging in a gas inflation mode after the cage sleeve is put into a well;

the top of the box-shaped seat 4 is fixedly connected with a vertical pipe 5, the bottom of the inner side of the annular plugging air bag 3 is fixedly sleeved with a lower sealing plate 18, the lower sealing plate 18 is fixedly sleeved on the four vertical struts 1 and the vertical pipe 5, the arranged lower sealing plate 18 plays a role in plugging the inside of the annular plugging air bag 3, the left side of the vertical pipe 5 is communicated with the left side of the inner side of the annular plugging air bag 3 and is fixedly provided with a vent pipe 6, the bottom of the vent pipe 6 is communicated with and fixedly provided with an electromagnetic valve 19, the vertical pipe 5 is fixedly sleeved with a top box 9, the bottom inner wall of the top box 9 is provided with a sleeved hole fixedly connected with the outer side of the vertical pipe 5, the top of the top box 9 is fixedly connected with two hanging rings, the arranged hanging rings play a role in bringing convenience for people to hoist and mount in a well by using an external rope, the bottom inner wall of the top box 9 is fixedly provided with an air pump 10, an air outlet of the air pump 10 extends into the vertical pipe 5, the top inner wall of the top box 9 is fixedly provided with a networking controller 20, the electromagnetic valve 19 and the air pump 10 are electrically connected with the networking controller 20;

the inner wall of the top of the box-shaped seat 4 is fixedly connected with a square seat 13, four sides of the square seat 13 are respectively provided with a screw driving component in a rotating way, one end of the screw driving component, which is far away from the square seat 13, extends out of the box-shaped seat 4 and is fixedly connected with a saw tooth supporting block 12, and the four screw driving components are used for driving the four saw tooth supporting blocks 12 to expand outwards or contract inwards; the screw driving assembly comprises screw rods 16 and rectangular rods 17, the four screw rods 16 are respectively and rotatably connected to the four sides of the rectangular seat 13, the four sides of the rectangular seat 13 are respectively provided with a rotating hole, a first bearing is fixedly sleeved in the rotating hole, the inner side of an inner ring of the first bearing is fixedly connected with the outer side of the corresponding screw rod 16, the screw rod 16 is rotatably connected with the rectangular seat 13 through the corresponding first bearing, the effect of rotatably supporting the screw rod 16 is achieved, the rectangular rods 17 are in threaded sleeve connection with the corresponding screw rod 16, the adjacent ends of the two opposite rectangular rods 17 are respectively provided with a threaded groove, the threaded grooves are in threaded connection with the corresponding screw rods 16, the effect of conveniently driving the rectangular rods 17 to move transversely when the screw rod 16 rotates is achieved by utilizing the threaded connection relation between the screw rods 16 and the threaded grooves, one end of the rectangular rod 17 away from the rectangular seat 13 extends out of the box seat 4 and is fixedly connected with one side, close to the box seat 4, of the box seat 4 is slidably sleeved on the four rectangular rods 17, the inner side of the rectangular seat 4 is provided with the rectangular rod 17, the rectangular rod 17 is respectively sleeved on the inner side of the four rectangular rod 16, the rectangular rod 17 is sleeved on the inner side of the rectangular seat 4, and the rectangular rod 17 is transversely sleeved on the rectangular rod 17, and the rectangular rod 17 is slidably sleeved on the rectangular rod 17 through the rectangular rod 17; the four screws 16 are matched with the rectangular rods 17, and when the four screws 16 rotate, the four rectangular rods 17 can be driven to outwards expand or inwards contract, so that the four saw-tooth support blocks 12 are driven to outwards expand or inwards contract, and the four saw-tooth support blocks 12 are utilized to expand to tightly press and support the inner wall of a well, so that the device is conveniently fixed with the inner side of the well;

one end, close to the four screw rods 16, of the same rotary linkage assembly is fixedly connected, the rotary linkage rod assembly is hermetically and rotatably sleeved in the vertical pipe 5, a driving motor 11 with an output shaft fixedly connected with the rotary linkage assembly is fixedly installed on the inner wall of the top box 9, the driving motor 11 is electrically connected with a networking controller 20, a storage battery is fixedly connected on the inner wall of the bottom of the top box 9, the driving motor 11, the air pump 10, the electromagnetic valve 19 and the networking controller 20 are electrically connected with the storage battery, the networking controller 20 is provided with a mobile phone end APP in a matched mode, the networking controller 20 plays a role in facilitating remote control of the driving motor 11, the air pump 10 and the electromagnetic valve 19 by personnel, and the rotary linkage assembly is used for synchronously driving the four screw rods 16 to rotate;

the rotary linkage assembly comprises a rotating shaft 7, a first bevel gear 14 and four second bevel gears 15, the rotating shaft 7 is hermetically and rotatably sleeved in the vertical pipe 5, two sealing bearings 8 are fixedly sleeved in the vertical pipe 5, the inner ring of each sealing bearing 8 is fixedly sleeved with the outer side of the rotating shaft 7, the air outlet of the air pump 10 and the vent pipe 6 are both positioned between the two sealing bearings 8, the two sealing bearings 8 play a role in hermetically and rotatably supporting the rotating shaft 7 and play an effect of intercepting air in the vertical pipe 5 at the upper part and the lower part, the bottom end of the rotating shaft 7 extends into the square seat 13 and is fixedly connected with the top of the first bevel gear 14, movable through holes for the rotating shaft 7 to penetrate are formed in the inner wall of the top of the box-shaped seat 4, the four second bevel gears 15 are respectively meshed with the four sides of the first bevel gears 14, one ends, close to each other, of the four screws 16 are respectively fixedly connected with one side of the four second bevel gears 15, the two opposite second bevel gears 15 are symmetrically arranged, and the top end of the rotating shaft 7 is fixedly connected with the bottom end of an output shaft of the driving motor 11; the rotating shaft 7, the first bevel gear 14 and the four second bevel gears 15 are matched, when the driving motor 11 is started, the first bevel gear 14 can be driven to rotate through the rotating shaft 7, the four second bevel gears 15 are driven to rotate through the first bevel gear 14, so that the four screws 16 are synchronously driven to rotate, and under the action of the symmetrical arrangement of the two opposite second bevel gears 15, the two opposite screws 16 are reversely rotated.

The application method of the embodiment is as follows: the device is bolted to a hanging ring by using an external hanging rope, then the device is lowered to a position needing blocking and interception in a well drilling by using the external hanging rope, then a networking controller 20 is controlled by a mobile phone end APP to control the driving motor 11 to start positively, the driving motor 11 drives the first bevel gear 14 to rotate through a rotating shaft 7, the first bevel gear 14 drives four screws 16 to synchronously rotate through four second bevel gears 15, the four screws 16 rotate to drive four rectangular rods 17 to synchronously expand outwards, the four rectangular rods 17 drive four saw-tooth supporting blocks 12 to synchronously expand outwards, and the four saw-tooth supporting blocks 12 which expand outwards move squeeze and support a well wall from inside to outside, so that the device is convenient, stable and fixed in the well drilling without repairing and expanding work under the squeezing and supporting force, the using convenience is improved, time and labor are saved, and the working efficiency is improved;

when in plugging, the mobile phone end APP is used for controlling the networking controller 20 to control the air pump 10 to be started, the air pump 10 transmits air into the vertical pipe 5, the air enters the annular plugging air bag 3 through the air pipe 6, and the annular plugging air bag 3 expands and is tightly pressed with the well wall along with the air entering, so that plugging and plugging in the well are realized, and the damage to the newly repaired non-solidified position of the well wall caused by upward collusion of the pressure in the well is prevented;

when the device is required to be taken out subsequently, the mobile phone end APP is used for controlling the networking controller 20 to control the electromagnetic valve 19 to be opened and controlling the driving motor 11 to be reversely started, when the electromagnetic valve 19 is opened, gas in the annular plugging air bag 3 is sequentially discharged through the vent pipe 6 and the electromagnetic valve 19, the expansion plugging state is relieved, the annular plugging air bag 3 is contracted, when the driving motor 11 is reversely started, the same principle is adopted, the movement direction of the driving motor 11 is completely opposite to that of the driving motor 11 in the forward starting process, at the moment, the four saw-tooth supporting blocks 12 are converted into inward contraction movement, the supporting state is relieved, and at the moment, the device can be directly pulled out from the well upwards.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (7)

1. The utility model provides a cage well drilling plugging device, includes box shape seat (4) and fixed connection at the cage of box shape seat (4) top, its characterized in that: the cage sleeve consists of four vertical supporting rods (1) and a plurality of circular rings (2), the four vertical supporting rods (1) are fixedly connected to the top of the box-shaped seat (4) at equal intervals in an annular shape, the plurality of circular rings (2) are all welded and sleeved on the outer sides of the four vertical supporting rods (1), and the outer sides of the plurality of circular rings (2) are adhered and sleeved with the same annular plugging air bag (3);

the top of the box-shaped seat (4) is fixedly connected with a vertical pipe (5), the left side of the vertical pipe (5) is communicated with the left side of the inner side of the annular plugging air bag (3) and is fixedly provided with a vent pipe (6), the bottom of the vent pipe (6) is communicated with and is fixedly provided with an electromagnetic valve (19), a top box (9) is fixedly sleeved on the vertical pipe (5), an air pump (10) is fixedly installed on the inner wall of the bottom of the top box (9), an air outlet of the air pump (10) extends into the vertical pipe (5), a networking controller (20) is fixedly installed on the inner wall of the top box (9), and the electromagnetic valve (19) and the air pump (10) are electrically connected with the networking controller (20);

the top inner wall of the box-shaped seat (4) is fixedly connected with a square seat (13), four sides of the square seat (13) are respectively provided with a screw driving component in a rotating mode, and one end, far away from the square seat (13), of the screw driving component extends out of the box-shaped seat (4) and is fixedly connected with a saw-tooth supporting block (12);

the four screw thread drive components are fixedly connected with the same rotary linkage component at one end close to each other, the rotary linkage rod component is hermetically and rotatably sleeved in the vertical pipe (5), the drive motor (11) with an output shaft fixedly connected with the rotary linkage component is fixedly mounted on the inner wall of the top box (9), and the drive motor (11) is electrically connected with the networking controller (20).

2. The caged well plugging device according to claim 1, wherein: the screw drive assembly comprises screw rods (16) and rectangular rods (17), the four screw rods (16) are respectively connected to four sides of the square-shaped seat (13) in a rotating mode, the rectangular rods (17) are arranged on the corresponding screw rods (16) in a threaded mode in a sleeved mode, one ends of the rectangular rods (17) away from the square-shaped seat (13) extend out of the box-shaped seat (4) and are fixedly connected with one sides, close to the box-shaped seat (4), of the corresponding saw-tooth supporting blocks (12), the box-shaped seat (4) is arranged on the four rectangular rods (17) in a sliding mode, and one ends, close to the four screw rods (16), of the rectangular rods are all extended into the square-shaped seat (13).

3. A caged well plugging device according to claim 2, wherein: the rotary linkage assembly comprises a rotating shaft (7), a first bevel gear (14) and four second bevel gears (15), the rotating shaft (7) is hermetically sleeved in the vertical pipe (5), the bottom end of the rotating shaft (7) extends into the square seat (13) and is fixedly connected with the top of the first bevel gear (14), the four second bevel gears (15) are respectively meshed with the four sides of the first bevel gear (14), one ends, close to the four screw rods (16), of the four second bevel gears (15) are respectively fixedly connected with one repulsive side of the four second bevel gears (15), the two opposite second bevel gears (15) are symmetrically arranged, and the top end of the rotating shaft (7) is fixedly connected with the bottom end of an output shaft of the driving motor (11).

4. The caged well plugging device according to claim 1, wherein: the top fixedly connected with rings of top box (9), fixedly connected with battery on the bottom inner wall of top box (9), driving motor (11), air pump (10), solenoid valve (19) and networking controller (20) all with battery electric connection, networking controller (20) are provided with cell-phone end APP in a matched manner.

5. The caged well plugging device according to claim 1, wherein: the bottom of the inner side of the annular plugging air bag (3) is adhered and sleeved with a lower sealing plate (18), and the lower sealing plate (18) is fixedly sleeved on the four vertical struts (1) and the vertical tubes (5).

6. A caged well plugging device according to claim 2, wherein: the two opposite rectangular rods (17) are provided with thread grooves at one ends close to each other, and the thread grooves are in threaded connection with corresponding screw rods (16).

7. A caged well plugging device according to claim 3, wherein: the internal fixation sleeve of the vertical pipe (5) is provided with two sealing bearings (8), the inner ring of the sealing bearings (8) is fixedly sleeved with the outer side of the rotating shaft (7), and the air outlet of the air pump (10) and the vent pipe (6) are both positioned between the two sealing bearings (8).

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