Portable outdoor sound equipment

Abstract

The invention relates to a portable outdoor sound box in the field of sound boxes, which comprises a safety shell, a sounding unit, a sealing plate and a movable box are mounted in the safety shell, and when the camping sound box is used outdoors, a large amount of accumulated water is generated in the area due to rainfall, and the liquid level of the accumulated water in a mounting cavity exceeds the lower end of the movable box, the sound box is opened. The movable box floats upwards in the direction of the sliding rod under the action of buoyancy until the movable box is attached to the sealing plate under the action of accumulated water, a sealed environment is formed for the sound production unit, the sound production unit is not prone to being soaked by rainwater and not prone to being damaged, meanwhile, a pressure sensor detects a pressure signal, and the sound production unit is prevented from being damaged. And adsorption is generated between the sealing plate and the movable box through the electromagnetic block, so that the sealing plate and the movable box can be kept in a sealed state for a long time, frequent opening and closing caused by water level changes in the mounting cavity are not likely to occur, external high-humidity air is not likely to be sucked into the position between the sealing plate and the movable box, and the waterproof performance is improved.

Description

Technical Field

[0001] The present invention relates to an outdoor speaker, and in particular to a portable outdoor speaker used in the field of audio. Background Art

[0002] Camping speakers are portable audio devices designed specifically for outdoor environments. They emphasize portability, long battery life, and outdoor-optimized sound quality. Suitable for camping, hiking, picnics, and other activities, they provide a stable music experience even in challenging natural conditions. Their core goal is to balance portability and functionality, meeting users' needs for sound transmission away from power sources, weather conditions, and open spaces.

[0003] The invention patent CN202420856609.8 specification discloses a camping lamp speaker. By adopting different suspension parts, the camping lamp speaker can choose whether to be equipped with suspension parts according to different usage scenarios. In this way, the camping lamp speaker can have at least three fixing methods, which improves the applicability of the camping lamp speaker. The invention patent CN201720851916.7 specification discloses a multifunctional Bluetooth speaker, which combines the functions of a drinking water cup, a Bluetooth speaker, a camping lamp, and a flashlight into a whole. When people are doing outdoor sports, they can not only enjoy music and provide drinking water at any time, but also provide lighting when camping outdoors.

[0004] In the existing technology, the development direction of camping speakers is mainly towards multi-functions, such as lighting and storage, to meet the usage needs of complex outdoor environments. However, in outdoor use environments, waterproof and dustproof are still the core requirements of camping speakers. Especially during camping, when outdoor activities occur, once heavy rain occurs, it is very easy for camping speakers to get wet and cause irreversible damage. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that during camping or outdoor activities, once heavy rain occurs, it is very easy for camping speakers to get wet and cause irreversible damage.

[0006] In order to solve the above problems, the present invention provides a portable outdoor speaker, comprising a safety shell, the safety shell comprising a shell, a plurality of legs fixedly connected to the lower end of the shell, a mounting cavity is bored in the shell, a sound amplification hole is bored in the side wall of one end of the mounting cavity, a sound amplification unit matching the shell is plugged into the sound amplification hole, a sound producing unit matching the position of the sound amplification unit is fixedly connected to the end of the inner wall of the mounting cavity away from the sound amplification unit, a sealing plate is provided on the upper side of the sound producing unit, the sealing plate is fixedly connected to the inner wall of the mounting cavity, a movable box matching the position and shape of the sealing plate is provided on the lower side of the sound producing unit, and an end of the movable box close to the inner wall of the mounting cavity is fitted with the mounting cavity, the overall density of the movable box is less than the density of water, a pair of sliding rods are plugged into the sealing plate, the lower ends of the sliding rods pass through the sealing plate and the movable box in sequence, and the two sliding rods are threadedly connected to locking nuts at the positions on the lower side of the movable box;

[0007] A maintenance hole is drilled at the lower end of the shell, and a matching bottom cover is connected to the maintenance hole. The bottom cover includes a cover body, and a pair of clamping blocks are fixedly connected to the lower end of the cover body. The cover body and the safety shell are fixedly connected by the clamping blocks. Multiple rainwater gutters are drilled on the cover body, and the multiple rainwater gutters completely penetrate the cover body.

[0008] The sealing plate includes a plate body, a tooth-shaped groove is carved on the lower side of one end of the plate body away from the inner wall of the installation cavity, a sealing gasket and a pressure sensor are fixedly connected to the top plate of the tooth-shaped groove, the pressure sensor passes through the sealing gasket, and a pair of electromagnetic blocks matching the position of the tooth-shaped groove are fixedly connected to the upper end of the plate body. The movable box includes a box body, a pair of magnetic blocks matching the position of the electromagnetic blocks are fixedly connected to the upper end of the box body, and the sealing gasket is adsorbed on the magnetic block when powered on.

[0009] In the above-mentioned portable outdoor speaker, in an environment where water accumulates under heavy rain, the movable box and the sealing plate form a sealed environment for the sound unit, making it difficult for the sound unit to be soaked by rainwater and damaged.

[0010] As a further improvement of the present application, the sound amplification unit includes a speaker body, an end of the speaker body close to the sound unit is fixedly connected to a protective net, and an end of the speaker body away from the protective net is fixedly connected to a fixing ring matching the sound amplification hole, and the fixing ring has a tendency to expand outward, and an elastic sealing ring is fixedly connected to the outer wall of the fixing ring, and the elastic sealing ring is located on the outside of the shell, so that the sound amplification unit as a whole is easy to disassemble and clean, reducing the amount of dust adhesion.

[0011] As a further improvement of the present application, a pair of through holes are opened at the upper end of the plate body to match the pair of sliding rods. The upper ends of the two sliding rods are countersunk, and sealing gaskets matching themselves are placed in the two through holes to increase the sealing performance of the connection between the sealing plate and the sliding rods and reduce the possibility of external water entering the sealed space between the sealing plate and the movable box.

[0012] As a further improvement of the present application, a pair of wear-resistant rings are fixedly connected to the bottom plate of the box body, which are matched with a pair of sliding rods respectively. The outer surfaces of the wear-resistant rings and the sliding rods are smooth, so that when the movable box slides along the sliding rods, the connection between the two is not prone to wear and the sealing of the movable box is not easily affected.

[0013] As another improvement of the present application, a wave-breaking plate is fixedly connected to the lower half of the box body away from the inner wall of the installation cavity. The wave-breaking plate moves away from the box body from bottom to top, which can form a certain barrier to the water surface waves in the shell, and is not easy to directly pass through the gap between the sealing plate and the movable box during the rising process of the movable box.

[0014] As another improvement supplement to the present application, the cross-sectional shape of multiple rain gutters is lightning-shaped, which reduces the impact on the outflow of accumulated water in the installation cavity, while reducing the dust in the outside air from entering the installation cavity through the rain gutters, thereby maintaining the environment inside the installation cavity.

[0015] As another improved supplement to the present application, an attachment layer is fixedly connected to the lower inner wall of the speaker body, and a plurality of capture units are fixedly connected to the upper end of the attachment layer. The plurality of capture units are all in a three-dimensional spiral structure, and two connected capture units are overlapped with each other to form a three-dimensional spatial structure. The capture units are used to capture dust and other debris present in the sound amplification unit.

[0016] As another improvement of the present application, an elastic cavity is bored in the elastic sealing ring, and the elastic cavity is filled with a plurality of filling beads, the sum of the volumes of the filling beads is greater than three-quarters of the space of the elastic cavity, and the dust captured by the capture unit can be released through the vibration generated by the sound waves of the pronunciation unit, so as to regularly clean the dust protected by the capture unit.

[0017] To sum up, when the camping speaker is used outdoors and encounters sudden heavy rain or other situations, when a large amount of water accumulates in the area where the camping speaker is located due to precipitation, the accumulated water enters the installation cavity through the rain gutter. When the water level in the installation cavity exceeds the lower end of the movable box, the movable box will float in the direction of the sliding rod under the action of buoyancy until the movable box fits with the sealing plate under the action of accumulated water, forming a sealed environment for the sound unit, so that the sound unit is not easily soaked by rainwater and is not easily damaged.

[0018] At the same time, when the sealing plate contacts the movable box due to buoyancy and the pressure sensor detects a pressure signal, adsorption is generated between the sealing plate and the movable box through the electromagnetic block, so that the sealing plate and the movable box can remain sealed for a long time, and are not prone to frequent opening and closing due to changes in the water level in the installation cavity, and are not prone to inhaling high-humidity air from the outside into the space between the sealing plate and the movable box.

[0019] Finally, by adding the structure of the attachment layer and the capture unit, the dust near the sound amplification unit can be captured to a certain extent, thereby increasing the dust-proof effect of the safety shell. When the capture unit has been used for a period of time, or the dust capture amount is saturated, the attachment layer and the capture unit can be directly replaced. When routine maintenance is required, the end of the safety shell where the sound amplification unit is installed can be covered on the desktop, and the dust captured by the capture unit can be cleaned using the sound waves generated by the pronunciation unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a portable outdoor speaker according to a first embodiment of the present application; Figure 2 This is a side cross-sectional view of a portable outdoor speaker according to a first embodiment of the present application; Figure 3 for Figure 2 Schematic diagram of the structure at A in the middle; Figure 4 This is a schematic structural diagram of a sealing plate according to a first embodiment of the present application; Figure 5 This is a schematic structural diagram of the activity box according to the first embodiment of the present application; Figure 6 A schematic structural diagram of the sound amplification unit of the first embodiment of this application; Figure 7 A schematic structural diagram of the disassembly plate of the first embodiment of this application; Figure 8 This is a schematic structural diagram of a portable outdoor speaker according to a second embodiment of the present application; Figure 9 A schematic structural diagram of the sound amplification unit of the second embodiment of this application; Figure 10 This is a side sectional view of a sound amplification unit according to a second embodiment of the present application; Figure 11 This is a structural schematic diagram of the cleaning of the sound amplification unit according to the second embodiment of the present application.

[0021] Description of the numbers in the figure:

[0022] 1 Safety shell, 101 shell, 102 installation cavity, 103 support foot, 2 sound unit, 3 sealing plate, 301 plate body, 302 toothed groove, 303 sealing gasket, 304 pressure sensor, 305 through hole 1, 306 electromagnetic block, 4 movable box, 401 box body, 402 wear-resistant ring, 403 magnetic block, 404 wave-proof plate, 5 sliding rod, 6 sound amplification unit, 601 speaker body, 602 protective net, 603 fixing ring, 604 elastic sealing ring, 605 adhesion layer, 606 capture unit, 607 filling beads, 7 bottom cover, 701 cover body, 702 card block, 703 rain gutter. DETAILED DESCRIPTION

[0023] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0024] The first implementation method:

[0025] Figure 1-Figure 7 A portable outdoor speaker is shown, comprising a safety shell 1, which comprises a shell body 101, a plurality of legs 103 being fixedly connected to the lower end of the shell body 101, an installation cavity 102 being bored in the shell body 101, a sound amplification hole being bored on the side wall of one end of the installation cavity 102, a sound amplification unit 6 matching itself being plugged into the sound amplification hole, a sound producing unit 2 matching the position of the sound amplification unit 6 being fixedly connected to the end of the inner wall of the installation cavity 102 away from the sound amplification unit 6, a sealing plate 3 being provided on the upper side of the sound producing unit 2, the sealing plate 3 being fixedly connected to the inner wall of the installation cavity 102, a movable box 4 matching the position and shape of the sealing plate 3 being provided on the lower side of the sound producing unit 2, and an end of the movable box 4 close to the inner wall of the installation cavity 102 being fitted into the installation cavity 102, the overall density of the movable box 4 being less than the density of water, a pair of sliding rods 5 being plugged into the sealing plate 3, the lower ends of the sliding rods 5 sequentially passing through the sealing plate 3 and the movable box 4, and the two sliding rods 5 being located at the lower side of the movable box 4 being threadedly connected with locking nuts;

[0026] A maintenance hole is bored at the lower end of the housing 101, into which a matching bottom cover 7 is connected. The bottom cover 7 includes a cover body 701, a pair of clamping blocks 702 are fixedly connected to the lower end of the cover body 701, and the cover body 701 is fixedly connected to the safety shell 1 through the clamping blocks 702. A plurality of rainwater gutters 703 are bored on the cover body 701, and the plurality of rainwater gutters 703 completely penetrate the cover body 701;

[0027] The sealing plate 3 includes a plate body 301, and a tooth-shaped groove 302 is carved on the lower side of one end of the plate body 301 away from the inner wall of the installation cavity 102. The top plate of the tooth-shaped groove 302 is fixedly connected with a sealing gasket 303 and a pressure sensor 304. The pressure sensor 304 passes through the sealing gasket 303. The upper end of the plate body 301 is fixedly connected with a pair of electromagnetic blocks 306 whose positions match the tooth-shaped groove 302. The movable box 4 includes a box body 401. The upper end of the box body 401 is fixedly connected with a pair of magnetic blocks 403 whose positions match the electromagnetic blocks 306, and the sealing gasket 303 is adsorbed with the magnetic blocks 403 when powered on.

[0028] In the present application, when the camping speaker is used outdoors and encounters sudden heavy rain or the like, when the campers forget to retract the camping speaker while taking shelter from the rain, due to the recessed structural design of the sound amplification unit 6, rainwater from the outside is not easy to enter the shell 101, and even a small amount of rainwater that enters the installation cavity 102 will quickly flow out through the rain gutter 703. When a large amount of water accumulates in the area where the camping speaker is located due to precipitation, the accumulated water enters the installation cavity 102 through the rain gutter 703. When the water level in the installation cavity 102 exceeds the lower end of the movable box 4, the movable box 4 will float in the direction of the slide rod 5 under the action of buoyancy, until the movable box 4 fits with the sealing plate 3 under the action of the accumulated water, forming a sealed environment for the pronunciation unit 2, so that the pronunciation unit 2 is not easily soaked by rainwater, and is not easily damaged.

[0029] When the sealing plate 3 contacts the movable box 4 due to buoyancy, the pressure sensor 304 is squeezed. When the pressure sensor 304 detects a pressure signal, a pair of electromagnetic blocks 306 are activated, and adsorption is generated between the sealing plate 3 and the movable box 4, so that the sealing plate 3 and the movable box 4 can maintain a sealed state for a long time, and are not prone to frequent opening and closing due to changes in the water level in the installation cavity 102, and are not prone to inhaling high-humidity air from the outside into the space between the sealing plate 3 and the movable box 4, thereby increasing the sealing effect of the sealing plate 3 and the movable box 4 and reducing the possibility of erosion of the pronunciation unit 2. The electromagnetic block 306 is powered off half an hour after it is activated. When the pressure sensor 304 still detects pressure, the electromagnetic block 306 resumes power supply, and the sealing plate 3 and the movable box 4 continue to be adsorbed.

[0030] The sound amplifying unit 6 includes a speaker body 601, and the end of the speaker body 601 close to the sound unit 2 is fixedly connected to a protective net 602, and the end of the speaker body 601 away from the protective net 602 is fixedly connected to a fixing ring 603 matching the sound amplifying hole, and the fixing ring 603 has a tendency to expand outward, and an elastic sealing ring 604 is fixedly connected to the outer wall of the fixing ring 603. The elastic sealing ring 604 is located on the outside of the shell 101, so that the sound amplifying unit 6 as a whole is easy to disassemble and clean, reducing the amount of dust adhesion.

[0031] See also Figure 4 A pair of through holes 305 matching the pair of slide rods 5 are bored at the upper end of the plate body 301. The upper ends of the two slide rods 5 are both countersunk, and sealing gaskets matching themselves are placed in the two through holes 305 to increase the sealing performance of the connection between the sealing plate 3 and the slide rods 5 and reduce the possibility of external water entering the sealed space between the sealing plate 3 and the movable box 4.

[0032] See also Figure 5A pair of wear-resistant rings 402 are fixedly connected to the bottom plate of the box body 401, which are matched with a pair of slide bars 5 respectively. The outer surfaces of the wear-resistant rings 402 and the slide bars 5 are smooth, so that when the movable box 4 slides along the slide bars 5, the connection between the two is not prone to wear, and the sealing of the movable box 4 is not easily affected. The lower half of the box body 401 away from the inner wall of the installation cavity 102 is fixedly connected with a wave-breaking plate 404. The wave-breaking plate 404 moves away from the box body 401 from the bottom to the top, which can form a certain barrier to the water waves in the shell 101, and is not easy to directly pass through the gap between the sealing plate 3 and the movable box 4 during the rising process of the movable box 4.

[0033] See also Figure 7 The cross-sectional shape of the multiple rain gutters 703 is lightning-shaped, which reduces the impact on the outflow of accumulated water in the installation cavity 102 and reduces the dust in the outside air from entering the installation cavity 102 through the rain gutters 703, thereby maintaining the environment inside the installation cavity 102.

[0034] The second implementation method:

[0035] Figure 8-9 The sound amplifying unit 6 shown in the figure has an attachment layer 605 fixedly connected to the lower inner wall of the speaker body 601, and a plurality of capture units 606 fixedly connected to the upper end of the attachment layer 605. The plurality of capture units 606 are all in a three-dimensional spiral structure, and two connected capture units 606 overlap each other to form a three-dimensional spatial structure. When dust and other debris at the sound amplifying unit 6 are close to the plurality of capture units 606, they will be captured by the capture units 606. At the same time, the sound waves generated by the sound unit 2 at work will cause the sound amplifying unit 6 to vibrate, thereby causing the captured dust to The connection between the capture unit 606 and the adhesion layer 605 is moved, which effectively prevents the captured dust from being re-raised. At the same time, when it is necessary to continue cleaning the surface of the loudspeaker unit 6, liquid water can be poured on the upper half of the speaker body 601, and the liquid water can be used to move the dust adhered to the surface of the speaker body 601 to the position of the capture unit 606, and then the dust is captured by the capture unit 606 and cleaned together. The elastic sealing ring 604 and the speaker body 601 are bonded by glue, and the adhesion layer 605 and the capture unit 606 can be directly torn off for replacement.

[0036] See also Figure 10-11An elastic cavity is bored in the elastic sealing ring 604, and a plurality of filling beads 607 are filled in the elastic cavity. The sum of the volumes of the filling beads 607 is greater than three-quarters of the elastic cavity space. The end of the safety shell 1 equipped with the sound amplification unit 6 can be covered on a flat table, and then the pronunciation unit 2 is started. The vibration generated by the sound waves of the pronunciation unit 2 is used to release the dust captured by the capture unit 606, which is used to regularly clean the dust protected by the capture unit 606 for daily maintenance. The design of the elastic sealing ring 604 structure can reduce the overall vibration amplitude of the safety shell 1 during the above-mentioned dust cleaning process, thereby increasing the stability of the safety shell 1.

[0037] In this embodiment, by adding the structure of the attachment layer 605 and the capture unit 606, the dust near the sound amplifying unit 6 can be captured to a certain extent, thereby increasing the dust-proof effect of the safety shell 1. When the capture unit 606 has been used for a period of time, or the dust capture amount is saturated, the attachment layer 605 and the capture unit 606 are directly replaced. When daily maintenance is required, the end of the safety shell 1 equipped with the sound amplifying unit 6 can be covered on the desktop, and the dust captured by the capture unit 606 can be cleaned by the sound waves generated by the pronunciation unit 2. There are two ways to clean the dust captured by the capture unit 606: one-time cleaning and daily cleaning. Users can choose according to their own needs.

[0038] In particular, for the sake of convenience of display, the various structures in the drawings of the present application specification are not drawn strictly in proportion. Those skilled in the art can design the size, proportion and shape of each structure according to actual conditions. In particular, the shape of the shell 101 can be designed according to design requirements, such as being designed into the shape of a lantern and a pumpkin lantern, and attaching a lighting function module. This is a well-known technology among those skilled in the art, so it is not disclosed in detail in this application. The larger space inside the installation cavity 102 in this application makes it convenient for users to perform daily maintenance on the internal structure of the installation cavity 102 through the maintenance hole. At the same time, the shell 101 can also be designed to be smaller in size, further increasing the portability of the shell 101. At that time, the difficulty of daily maintenance will be greatly increased due to the relatively tight installation. Those skilled in the art will make choices according to actual needs.

[0039] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A portable outdoor speaker, comprising a safety housing (1), characterized in that: The safety shell (1) comprises a shell (101), a plurality of legs (103) are fixedly connected to the lower end of the shell (101), a mounting cavity (102) is bored in the shell (101), a sound amplification hole is bored on one end side wall of the mounting cavity (102), a sound amplification unit (6) matching the mounting cavity (102) is plugged into the sound amplification hole, a sound unit (2) matching the position of the sound amplification unit (6) is fixedly connected to the end of the inner wall of the mounting cavity (102) away from the sound amplification unit (6), a sealing plate (3) is provided on the upper side of the sound amplification unit (2), and the sealing plate (3) is fixedly connected to the inner wall of the installation cavity (102), a movable box (4) matching the position and shape of the sealing plate (3) is provided on the lower side of the pronunciation unit (2), and one end of the movable box (4) close to the inner wall of the installation cavity (102) is in contact with the installation cavity (102), the overall density of the movable box (4) is less than the density of water, a pair of sliding rods (5) are plugged into the sealing plate (3), the lower ends of the sliding rods (5) pass through the sealing plate (3) and the movable box (4) in sequence, and the two sliding rods (5) are threadedly connected to the position of the lower side of the movable box (4) with locking nuts; A maintenance hole is bored at the lower end of the shell (101), and a bottom cover (7) matching the shell (101) is connected to the maintenance hole. The bottom cover (7) includes a cover body (701), and a pair of clamping blocks (702) are fixedly connected to the lower end of the cover body (701). The cover body (701) and the safety shell (1) are fixedly connected via the clamping blocks (702). A plurality of rainwater gutters (703) are bored on the cover body (701), and the plurality of rainwater gutters (703) completely penetrate the cover body (701). The sealing plate (3) comprises a plate body (301), a tooth-shaped groove (302) is cut on the lower side of one end of the plate body (301) away from the inner wall of the installation cavity (102), a sealing gasket (303) and a pressure sensor (304) are fixedly connected to the top plate of the tooth-shaped groove (302), and the pressure sensor (304) passes through the sealing gasket (303), and a pair of electromagnetic blocks (306) whose positions match the tooth-shaped groove (302) are fixedly connected to the upper end of the plate body (301), and the movable box (4) comprises a box body (401), a pair of magnetic blocks (403) whose positions match the electromagnetic blocks (306) are fixedly connected to the upper end of the box body (401), and the sealing gasket (303) is adsorbed with the magnetic blocks (403) when the power is on.

2. The portable outdoor speaker according to claim 1, characterized in that: The sound amplification unit (6) comprises a speaker body (601), one end of the speaker body (601) close to the sound unit (2) is fixedly connected to a protective net (602), and one end of the speaker body (601) away from the protective net (602) is fixedly connected to a fixing ring (603) matching the sound amplification hole, and the fixing ring (603) has a tendency to expand outward, and an elastic sealing ring (604) is fixedly connected to the outer wall of the fixing ring (603), and the elastic sealing ring (604) is located outside the shell (101).

3. The portable outdoor speaker according to claim 1, characterized in that: A pair of through holes (305) matching a pair of slide bars (5) are bored at the upper end of the plate body (301), the upper ends of the two slide bars (5) are both countersunk, and sealing gaskets matching themselves are placed in the two through holes (305).

4. The portable outdoor speaker according to claim 1, characterized in that: A pair of wear-resistant rings (402) respectively matching a pair of slide bars (5) are fixedly connected to the bottom plate of the box body (401), and the outer surfaces of the wear-resistant rings (402) and the slide bars (5) are both smooth.

5. The portable outdoor speaker according to claim 1, characterized in that: A wave-breaking plate (404) is fixedly connected to the lower half of the box body (401) at one end away from the inner wall of the installation cavity (102), and the wave-breaking plate (404) is away from the box body (401) from bottom to top.

6. The portable outdoor speaker according to claim 1, characterized in that: The cross-sectional shape of the plurality of rain gutters (703) is lightning-shaped.

7. The portable outdoor speaker according to claim 2, characterized in that: The lower inner wall of the speaker body (601) is fixedly connected to an attachment layer (605), and the upper end of the attachment layer (605) is fixedly connected to a plurality of capture units (606), and the plurality of capture units (606) are all in a three-dimensional spiral structure, and two connected capture units (606) overlap each other to form a three-dimensional spatial structure.

8. The portable outdoor speaker according to claim 7, characterized in that: An elastic cavity is bored in the elastic sealing ring (604), and the elastic cavity is filled with a plurality of filling beads (607), and the sum of the volumes of the filling beads (607) is greater than three quarters of the elastic cavity space.

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