Air conditioner silencer sealing detection equipment

Abstract

The utility model relates to the technical field of silencer sealing detection equipment, and particularly discloses air conditioner silencer sealing detection equipment, which comprises a workbench and an air pumping mechanism, the air pumping mechanism is arranged in the workbench in a penetrating manner, and a supporting structure is arranged below one end of the air pumping mechanism. A first sealing mechanism is arranged above the workbench, two clamping mechanisms are symmetrically arranged below the first sealing mechanism, a limiting structure is arranged on one side of each clamping mechanism, and a second sealing mechanism is arranged at one end of the upper portion of the workbench. The air conditioner silencer sealing detection device can be simultaneously suitable for sealing detection operation of air conditioner silencers with one end bent, one end straight and two ends straight, the application range and the use scene of the detection device are enriched, and the utilization rate of the detection device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of muffler sealing detection equipment, and specifically discloses an air conditioner muffler sealing detection equipment. Background Art

[0002] An air conditioner silencer is a device used to reduce the noise generated when an air conditioning system is running. Its main function and principle is to use components such as sound-absorbing materials, reflective plates and impedance tubes to absorb, reflect and interfere with sound waves, thereby reducing the noise generated when the air conditioning system is running. An air conditioner silencer is usually installed at the air inlet and outlet of the air conditioner to effectively reduce the impact of noise on the indoor environment and improve comfort. In the production process of an air conditioner silencer, an air conditioner silencer sealing detection equipment is usually used to detect the sealing performance of the air conditioner silencer to ensure the quality of the air conditioner silencer. The Chinese patent with the announcement number CN218847547U discloses an air conditioner silencer sealing detection equipment, including a box body, a mounting slide rod frame and a silencer body, a mounting frame is fixedly installed on the top of the box body, a mounting slide rod frame is fixedly installed on the front of the mounting frame, two sets of clamping mechanisms are sleeved and installed on the outer side of the mounting slide rod frame, and the clamping mechanism includes a sliding block, a threaded seat is fixedly installed on the top of the sliding block, a clamping plate is fixedly installed on one side of the threaded seat, and a threaded seat is fixedly installed on the top of the threaded seat. A fixing screw is threadedly installed, and a detection air pipe extending to the inside is fixedly installed on one side of the mounting slide rod frame, and a docking mechanism is fixedly installed on one side of the detection air pipe, and the docking mechanism includes a docking sleeve, threaded sleeves are installed on both sides of the docking sleeve, and a screw extending to the bottom is threadedly installed inside the threaded sleeve, and an arc plate is installed at the bottom of the screw through a rotating shaft, so that the function of clamping and fixing the muffler body according to the size of the muffler body is realized, and the convenience of sealing detection of the muffler body is improved. However, the position adjustment and fixing of the above-mentioned detection equipment are inconvenient. When the position needs to be adjusted, multiple workers are required to carry it, which is not conducive to saving the workers' effort, and the above-mentioned detection equipment is only suitable for sealing detection of air-conditioning mufflers with a straight pipe at one end and a curved pipe at the other end, and is not suitable for air-conditioning mufflers with straight pipes at both ends. To a certain extent, the scope of application and use scenarios of the above-mentioned detection equipment are limited, and the utilization rate of the above-mentioned detection equipment is affected, which is relatively inconvenient. Therefore, in order to solve the above-mentioned problems, the utility model proposes an air-conditioning muffler sealing detection equipment. Utility Model Content

[0003] The utility model aims to provide an air-conditioning muffler sealing detection device, which is easy to move and fix, saves workers' effort, and can be applied to the sealing detection operations of air-conditioning mufflers with a curved pipe at one end, a straight pipe at one end, and straight pipes at both ends, thereby enriching the application scope and usage scenarios of the detection device and improving the utilization rate of the detection device.

[0004] The utility model is realized by the following technical solutions:

[0005] An air conditioner muffler sealing detection device comprises a workbench and an air pumping mechanism, wherein the workbench is provided with an air pumping mechanism running through the interior of the workbench, a supporting structure is provided below one end of the air pumping mechanism, a first sealing mechanism is provided above the workbench, two clamping mechanisms are symmetrically provided below the first sealing mechanism, a limiting structure is provided on one side of the clamping mechanism, a second sealing mechanism is provided at the upper end of the workbench, the workbench comprises a carrying plate, a storage box and a first bracket, a controller is provided on one side above the carrying plate, a limiting hole is provided inside the carrying plate, a plurality of supporting legs are provided below the carrying plate, and the A universal brake wheel is connected to the bottom of the supporting leg, a storage box is arranged under the supporting plate, a first bracket is arranged on one side of the storage box, the air pumping mechanism includes an air pump, an air pipe and a connecting pipe, the supporting structure includes an arc plate and a first telescopic rod, the arc plate is rotatably connected to the first telescopic rod below by bolts, the lower end of the first telescopic rod is connected to the supporting plate, the first sealing mechanism includes a second bracket, a second telescopic rod and a second sleeve, the clamping mechanism includes a first connecting plate and a third telescopic rod, the limiting structure includes a second connecting plate and a first limiting plate, and the second sealing mechanism includes a fourth telescopic rod and a third sleeve.

[0006] As a further configuration of the above scheme, the air pump is connected to the first bracket, and an air supply pipe is arranged above the air pump, and the air supply pipe runs through the interior of the supporting plate, and one end of the air supply pipe is connected to a connecting pipe, and a valve is arranged at the end of the connecting pipe close to the air supply pipe, and a pressure gauge is arranged on one side of the valve, and the pressure gauge is connected to the controller and the terminal device through electrical signals, and the end of the connecting pipe away from the air supply pipe is connected to a conical pipe, and the end of the conical pipe away from the connecting pipe is connected to the air-conditioning muffler body, and a first sleeve is arranged on the outside of the conical pipe, and a first elastic sealing ring is connected to the inside of the first sleeve. The above design facilitates the connection between the pumping mechanism and the air-conditioning muffler body, so that the equipment is suitable for the sealing detection operation of air-conditioning mufflers of different models, and can close the valve when the value of the pressure gauge reaches a certain value to keep the connecting pipe, the conical pipe and the inside of the air-conditioning muffler body in a relatively sealed state, so as to facilitate the judgment of whether the air-conditioning muffler is leaking by the change of the value of the pressure gauge.

[0007] As a further configuration of the above scheme, the lower end of the second bracket is connected to the bearing plate, a slide rail is provided at the top of the second bracket, a slider is provided on the outer side of the slide rail, a second telescopic rod is connected below the slider, the telescopic end of the second telescopic rod is connected to a second sleeve, a plurality of second elastic sealing rings with successively decreasing diameters are connected to the inner side of the second sleeve, and the second sleeve is connected to the air-conditioning muffler body through the second elastic sealing ring. The above design can seal the upper end of the air-conditioning muffler body, and is convenient for adjusting the number of the second elastic sealing rings according to the diameter of the pipe at the upper end of the air-conditioning muffler body, thereby ensuring the sealing effect of the upper end of the air-conditioning muffler body, and further ensuring the quality of the sealing detection.

[0008] As a further configuration of the above scheme, an elastic plate is provided on one side of the first connecting plate, and the side of the first connecting plate away from the elastic plate is rotatably connected to the third telescopic rod through a bolt, and the third telescopic rod is connected to the second bracket. The above design facilitates adjusting and fixing the angles of the first connecting plate and the elastic plate according to the model of the air-conditioning muffler, and clamping different models of air-conditioning mufflers while avoiding damage to the air-conditioning muffler.

[0009] As a further configuration of the above scheme, a first limit plate is provided on one side of the second connecting plate, a second limit plate is provided below the first limit plate, the lower end of the second connecting plate is connected to the limit hole, and blocks are provided on both sides of the second connecting plate, and the blocks are engaged with the limit holes. The above design can limit the position of the air conditioner muffler during the placement of the air conditioner muffler, and facilitates the connection of the air pumping mechanism, the clamping mechanism, the first sealing mechanism and the second sealing mechanism with the air conditioner muffler.

[0010] As a further configuration of the above scheme, a mounting seat is provided on the outer side of the fourth telescopic rod, and the mounting seat is connected to the bearing plate. The telescopic end of the fourth telescopic rod is connected to a third sleeve, and a plurality of third elastic sealing rings with successively decreasing diameters are provided inside the third sleeve. The above design can fix the air-conditioning muffler with straight pipes at both ends, and can detect the air-conditioning muffler with straight pipes at both ends. Beneficial Effects

[0011] During the use of the utility model, the use of multiple universal brake wheels makes it convenient to adjust and fix the position of the device, the use of a storage box makes it convenient to take and place related parts in the detection device, standardize the position of parts, and avoid loss of parts, the combination of the tapered tube, the first sleeve and the first elastic sealing ring makes the air pumping mechanism suitable for sealing and fixing the end heads of air-conditioning mufflers of different diameters, the combined use of the first sealing mechanism and the second sealing mechanism makes the device simultaneously suitable for sealing detection operations of air-conditioning mufflers with a curved pipe at one end, a straight pipe at one end, and straight pipes at both ends, enriching the application scope and usage scenarios of the detection device and improving the utilization rate of the detection device, the use of the limiting structure can limit the position of the air-conditioning muffler during the placement of the air-conditioning muffler, facilitate the connection of the air-conditioning muffler with the air pumping mechanism, the first sealing mechanism, the clamping mechanism and other mechanisms, save the time of placing the air-conditioning muffler, and improve the detection efficiency of the air-conditioning muffler. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 is a perspective view of the utility model;

[0014] Figure 2 It is a perspective view of the workbench in the utility model;

[0015] Figure 3 It is a perspective view of the air pump mechanism in the utility model;

[0016] Figure 4 It is a perspective view of the supporting structure in the utility model;

[0017] Figure 5 It is a perspective view of the first sealing mechanism in the utility model;

[0018] Figure 6 It is a perspective view of the clamping mechanism in the utility model;

[0019] Figure 7 It is a perspective view of the limiting structure in the utility model;

[0020] Figure 8 It is a perspective view of the second sealing mechanism in the utility model.

[0021] In the figure: 1, workbench; 2, air pump mechanism; 3, supporting structure; 4, first sealing mechanism; 5, clamping mechanism; 6, limiting structure; 7, second sealing mechanism; 8, controller; 9, air conditioner silencer body; 11, bearing plate; 111, limiting hole; 12, supporting leg; 121, universal brake wheel; 13, storage box; 14, first bracket; 21, air pump; 22, air pipe; 23, connecting pipe; 231, valve; 232, barometer; 24, tapered pipe; 25, first sleeve; 251, first An elastic sealing ring; 31, an arc plate; 32, a first telescopic rod; 33, a bolt; 41, a second bracket; 411, a slide rail; 42, a slider; 43, a second telescopic rod; 44, a second sleeve; 441, a second elastic sealing ring; 51, a first connecting plate; 52, an elastic plate; 53, a third telescopic rod; 61, a second connecting plate; 62, a first limiting plate; 63, a second limiting plate; 64, a block; 71, a fourth telescopic rod; 72, a mounting seat; 73, a third sleeve; 731, a third elastic sealing ring. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 8 , and describes the application in detail with reference to embodiments.

[0024] The embodiment discloses an air conditioner muffler sealing detection device, comprising a workbench 1 and an air pumping mechanism 2, wherein the workbench 1 is provided with the air pumping mechanism 2 running through the interior thereof, a supporting structure 3 is provided below one end of the air pumping mechanism 2, a first sealing mechanism 4 is provided above the workbench 1, two clamping mechanisms 5 are symmetrically provided below the first sealing mechanism 4, a limiting structure 6 is provided on one side of the clamping mechanism 5, a second sealing mechanism 7 is provided at the upper end of the workbench 1, the workbench 1 comprises a carrying plate 11, a storage box 13 and a first bracket 14, a controller 8 is provided on one side above the carrying plate 11, a limiting hole 111 is provided inside the carrying plate 11, a plurality of supporting legs 12 are provided below the carrying plate 11, and the supporting legs 12 are connected below It is connected to a universal brake wheel 121, a storage box 13 is arranged below the supporting plate 11, a first bracket 14 is arranged on one side of the storage box 13, the air pumping mechanism 2 includes an air pump 21, an air pipe 22 and a connecting pipe 23, the supporting structure 3 includes an arc plate 31 and a first telescopic rod 32, the arc plate 31 is rotatably connected to the first telescopic rod 32 below by a bolt 33, the lower end of the first telescopic rod 32 is connected to the supporting plate 11, the first sealing mechanism 4 includes a second bracket 41, a second telescopic rod 43 and a second sleeve 44, the clamping mechanism 5 includes a first connecting plate 51 and a third telescopic rod 53, the limiting structure 6 includes a second connecting plate 61 and a first limiting plate 62, and the second sealing mechanism 7 includes a fourth telescopic rod 71 and a third sleeve 73.

[0025] like Figure 1 and Figure 3 As shown, the air pump 21 is connected to the first bracket 14, an air delivery pipe 22 is arranged above the air pump 21, the air delivery pipe 22 runs through the interior of the bearing plate 11, one end of the air delivery pipe 22 is connected to a connecting pipe 23, the end of the connecting pipe 23 close to the air delivery pipe 22 is provided with a valve 231, one side of the valve 231 is provided with a pressure gauge 232, the pressure gauge 232 is connected to the controller 8 and the terminal device through an electrical signal, the end of the connecting pipe 23 away from the air delivery pipe 22 is connected to a conical pipe 24, the conical pipe 24 away from the connecting pipe 23 The end is connected to the air-conditioning muffler body 9, and a first sleeve 25 is arranged on the outer side of the conical tube 24. A first elastic sealing ring 251 is connected to the inner side of the first sleeve 25, so that the air pump mechanism 2 and the air-conditioning muffler body 9 are conveniently connected to each other, so that the equipment is suitable for sealing detection operations of air-conditioning mufflers of different models. When the value of the barometer 232 reaches a certain value, the valve 231 can be closed to keep the connecting tube 23, the conical tube 24 and the inside of the air-conditioning muffler body 9 relatively sealed, so that it is convenient to judge whether the air-conditioning muffler is leaking by the value change of the barometer 232.

[0026] like Figure 1 and Figure 5 As shown, the lower end of the second bracket 41 is connected to the bearing plate 11, and a slide rail 411 is provided at the top end of the second bracket 41. A slider 42 is provided on the outer side of the slide rail 411, and a second telescopic rod 43 is connected to the bottom of the slider 42. The telescopic end of the second telescopic rod 43 is connected to a second sleeve 44, and the inner side of the second sleeve 44 is connected to a plurality of second elastic sealing rings 441 with successively decreasing diameters. The second sleeve 44 is connected to the air-conditioning muffler body 9 through the second elastic sealing ring 441, and can seal the upper end of the air-conditioning muffler body 9, so as to facilitate adjusting the number of the second elastic sealing rings 441 according to the diameter of the pipe at the upper end of the air-conditioning muffler body 9, thereby ensuring the sealing effect of the upper end of the air-conditioning muffler body 9, and further ensuring the quality of the sealing detection.

[0027] like Figure 1 and Figure 6 As shown, an elastic plate 52 is provided on one side of the first connecting plate 51, and the side of the first connecting plate 51 away from the elastic plate is rotatably connected to the third telescopic rod 53 through a bolt 33, and the third telescopic rod 53 is connected to the second bracket 41, so as to facilitate adjusting and fixing the angles of the first connecting plate 51 and the elastic plate 52 according to the model of the air-conditioning muffler, and to clamp different models of air-conditioning mufflers while avoiding damage to the air-conditioning muffler.

[0028] like Figure 1 and Figure 7 As shown, a first limiting plate 62 is provided on one side of the second connecting plate 61, a second limiting plate 63 is provided below the first limiting plate 62, the lower end of the second connecting plate 61 is connected to the limiting hole 111, and blocks 64 are provided on both sides of the second connecting plate 61. The blocks 64 are engaged with the limiting holes 111, which can limit the position of the air-conditioning muffler during the placement of the air-conditioning muffler, and facilitate the connection of the air pumping mechanism 2, the clamping mechanism 5, the first sealing mechanism 4 and the second sealing mechanism 7 with the air-conditioning muffler.

[0029] like Figure 1 and Figure 8 As shown, a mounting seat 72 is provided on the outer side of the fourth telescopic rod 71, and the mounting seat 72 is connected to the supporting plate 11. The telescopic end of the fourth telescopic rod 71 is connected to a third sleeve 73. A plurality of third elastic sealing rings 731 with successively decreasing diameters are provided inside the third sleeve 73, which can fix the air-conditioning muffler with straight pipes at both ends and detect the air-conditioning muffler with straight pipes at both ends.

[0030] The air conditioner silencer sealing detection device disclosed in the present embodiment selects the first sealing mechanism or the second sealing mechanism to be used according to the model of the air conditioner silencer to be detected and the direction of the curved and straight pipes before use. When one end of the air conditioner silencer to be detected is a straight pipe and the other end is a curved pipe, the first sealing mechanism needs to be used during the detection process. According to the angle of the straight pipe and the curved pipe, as well as the angle of the air conditioner silencer, the multiple bolts 33 are loosened, the angles of the first sleeve 25, the second sleeve 44, the first connecting plate 51 and the elastic plate 52 are adjusted and fixed, and an air conditioner silencer is picked up and placed between the two clamping mechanisms 5, so that one end of the straight pipe faces upward and one end of the curved pipe faces upward. The end of the bent pipe is slowly extended into the first elastic sealing ring 251 toward the tapered pipe 24, so that the outer wall of the bent pipe squeezes the first elastic sealing ring 251, and at the same time, the end of the tapered pipe 24 is extended into the air conditioner silencer for a distance until the tapered pipe 24 can no longer go deeper, and the controller 8 is used to control the extension of the two third telescopic rods 53 at the same time, so that the two elastic plates 52 clamp the air conditioner silencer, and the number of the second elastic sealing rings 441 is adjusted according to the diameter of the straight pipe, so that the inner diameter of the innermost second elastic sealing ring 441 is smaller than the diameter of the straight pipe, and the positions of the slider 42 and the second telescopic rod 43 are adjusted so that the second sleeve 44 is located directly above the straight pipe. Use the controller 8 to control the extension of the second telescopic rod 43, push the second sleeve 44 and the second elastic sealing ring 441 to slowly move toward the straight pipe direction, so that the outer wall of the straight pipe can seal the straight pipe opening by squeezing the second elastic sealing ring 441 of the innermost circle, adjust the position of the second connecting plate 61, and fix it with the clamping block 64 after one side of the first limiting plate 62 is in contact with the air conditioner silencer body 9, then open the valve 231, use the controller 8 to start the air pump 21, and inject air into the air conditioner silencer body 9 through the air supply pipe 22, the connecting pipe 23 and the tapered pipe 24, and when the value of the barometer 232 is close to a constant value, quickly close the valve 231, turn off the air pump 21, observe the air pressure value within a certain time interval transmitted back by the barometer 232 according to the controller 8 or the terminal device, and judge whether the air conditioner silencer is sealed. If the air pressure value interval meets the ideal interval, the air conditioner silencer has good sealing performance. On the contrary, if it does not meet the ideal interval, the air conditioner silencer has poor sealing performance and needs further inspection. When the inspection is completed, loosen the clamping mechanism 5 and the first sealing mechanism to fix the air conditioner silencer body 9, separate the bent pipe of the air conditioner silencer body 9 from the first sleeve 25 and the tapered tube 24, and repeat the above operation to perform sealing inspection on the air conditioner silencers of the same batch and the same model.

[0031] When both ends of the air-conditioning muffler to be tested are straight pipes, the second sealing mechanism is required to be used, and the number of the third elastic sealing ring 731 is adjusted so that the diameter of the innermost circle of the third elastic sealing ring 731 is slightly smaller than the diameter of the straight pipe. The air-conditioning muffler body 9 is placed between the first sleeve 25 and the third sleeve 73, and one end of the air-conditioning muffler body 9 is connected to the conical tube 24 and the first elastic sealing ring 251. The controller 8 is used to control the extension of the fourth telescopic rod 71 to push the third sleeve 73 and the third elastic sealing ring 731. The third elastic sealing ring 731 is connected to the other end of the air-conditioning muffler body 9. The position of the limiting structure 6 is adjusted so that the second limiting plate 63 fits against one side of the air-conditioning muffler body 9. Then, the above-mentioned pumping and testing operations are repeated to perform sealing testing on the air-conditioning muffler with straight pipes at both ends.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioner muffler sealing detection device, comprising a workbench and an air pump mechanism, characterized in that: An air pumping mechanism is arranged throughout the interior of the workbench, a supporting structure is arranged below one end of the air pumping mechanism, a first sealing mechanism is arranged above the workbench, two clamping mechanisms are symmetrically arranged below the first sealing mechanism, a limiting structure is arranged on one side of the clamping mechanism, a second sealing mechanism is arranged at the upper end of the workbench, the workbench comprises a carrying plate, a storage box and a first bracket, a controller is arranged on one side above the carrying plate, limiting holes are arranged inside the carrying plate, a plurality of supporting legs are arranged below the carrying plate, and a universal brake is connected below the supporting legs. Wheel, a storage box is arranged below the carrying plate, a first bracket is arranged on one side of the storage box, the air pumping mechanism includes an air pump, an air pipe and a connecting pipe, the supporting structure includes an arc plate and a first telescopic rod, the arc plate is rotatably connected with the first telescopic rod below by bolts, the lower end of the first telescopic rod is connected to the carrying plate, the first sealing mechanism includes a second bracket, a second telescopic rod and a second sleeve, the clamping mechanism includes a first connecting plate and a third telescopic rod, the limiting structure includes a second connecting plate and a first limiting plate, and the second sealing mechanism includes a fourth telescopic rod and a third sleeve.

2. The air conditioner muffler sealing detection device according to claim 1, characterized in that: The air pump is connected to the first bracket, and an air pipe is arranged above the air pump, and the air pipe runs through the interior of the supporting plate, and one end of the air pipe is connected to a connecting pipe, and a valve is arranged at the end of the connecting pipe close to the air pipe, and a pressure gauge is arranged on one side of the valve, and the pressure gauge is connected to the controller and the terminal device through electrical signals, and the end of the connecting pipe away from the air pipe is connected to a conical pipe, and the end of the conical pipe away from the connecting pipe is connected to the air conditioner muffler body, and a first sleeve is arranged on the outside of the conical pipe, and a first elastic sealing ring is connected to the inside of the first sleeve.

3. The air conditioner muffler sealing detection device according to claim 1, characterized in that: The lower end of the second bracket is connected to the bearing plate, a slide rail is provided at the top of the second bracket, a slider is provided on the outer side of the slide rail, a second telescopic rod is connected below the slider, a second sleeve is connected to the telescopic end of the second telescopic rod, a plurality of second elastic sealing rings with successively decreasing diameters are connected to the inner side of the second sleeve, and the second sleeve is connected to the air conditioner muffler body through the second elastic sealing ring.

4. The air conditioner muffler sealing detection device according to claim 1, characterized in that: An elastic plate is arranged on one side of the first connecting plate, and a side of the first connecting plate away from the elastic plate is rotatably connected to the third telescopic rod through a bolt, and the third telescopic rod is connected to the second bracket.

5. The air conditioner muffler sealing detection device according to claim 1, characterized in that: A first limiting plate is arranged on one side of the second connecting plate, a second limiting plate is arranged below the first limiting plate, a lower end of the second connecting plate is connected to the limiting hole, and clamping blocks are arranged on both sides of the second connecting plate, and the clamping blocks are engaged and connected with the limiting holes.

6. The air conditioner muffler sealing detection device according to claim 1, characterized in that: A mounting seat is arranged on the outer side of the fourth telescopic rod, and the mounting seat is connected to the bearing plate. A third sleeve is connected to the telescopic end of the fourth telescopic rod, and a plurality of third elastic sealing rings with successively decreasing diameters are arranged inside the third sleeve.

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