Connector of household faucet

Abstract

The invention belongs to the technical field of submersible pump manufacturing, and particularly relates to a household faucet connector which comprises a tubular table top fixing part and a tubular movable meshing part, at least three meshing hooks are arranged on the circumferential face of the upper end of the table top fixing part, auxiliary hooks matched with the meshing hooks are arranged on the circumferential face of the lower end of the movable meshing part, each meshing hook is in a 7 shape, and the auxiliary hooks are connected with the table top fixing part. An elastic sealing ring is coaxially arranged between the lower end of the movable meshing portion and the upper end of the table top fixing portion, when the auxiliary hooks are meshed with the meshing hooks, the elastic sealing ring is squeezed, and the gap between every two adjacent meshing hooks is larger than or equal to the length of the transverse portion of the 7-shaped auxiliary hook. And a first external thread is arranged on the circumferential surface of the upper end of the movable meshing part and above the auxiliary hook, so that the problem of how to bring convenience to a user for components (namely the movable meshing part and the water faucet) above a table top is solved.

Description

Technical Field

[0001] This application belongs to the field of home furnishing product manufacturing technology, specifically a connector for a home faucet. Background Technology

[0002] Currently, household faucets are fixedly installed on countertops (such as sinks) and secured with nuts. Therefore, when the style or color of the faucet doesn't match the room's decor and needs replacement, the entire set must be disassembled. This is because the countertop mounting section that secures the faucet is fixed, and the water pipe runs through this section to connect to the faucet. While the faucet can rotate, the water pipe cannot, making it prone to tangling and damage. Disassembly requires loosening the nuts securing the faucet at the bottom of the countertop and removing it from the bottom up. However, the space under the countertop is limited, making this inconvenient. Therefore, a faucet design is needed that allows for easy installation and removal of components above the countertop. Summary of the Invention

[0003] The purpose of this application is to address the shortcomings of existing technologies by designing a connector for a household faucet that uses a hook on the fixed part of the countertop and a secondary hook on the movable engaging part to work with an elastic sealing ring, thereby solving the problem of how to facilitate the user to disassemble and replace parts above the countertop.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] A connector for a household faucet includes a tubular countertop fixing part and a tubular movable engaging part. The upper circumferential surface of the countertop fixing part is provided with at least three hooks, and the lower circumferential surface of the movable engaging part is provided with a secondary hook that mates with each hook. Each hook is shaped like a "7", and each secondary hook is shaped like an inverted "7". An elastic sealing ring is coaxially arranged between the lower end of the movable engaging part and the upper end of the countertop fixing part. When the secondary hook engages with the hooks, the elastic sealing ring is compressed. The gap between two adjacent hooks is greater than or equal to the length of the transverse portion of the "7" shape of the secondary hook. The upper circumferential surface of the movable engaging part is provided with a first external thread above the secondary hook.

[0006] Preferably, the angle between the vertical and horizontal portions of the bite hook is an obtuse angle, and the angle between the vertical and horizontal portions of the secondary hook is also an obtuse angle; the end face of the free end of the horizontal portion of each bite hook is a first inclined surface, the first inclined surface is parallel to the second inclined surface of the vertical portion of the bite hook that is provided with the first inclined surface facing away from the horizontal portion, the end face of the free end of the 7-shaped horizontal portion of each secondary hook is a third inclined surface, and the inclined surface on the side of the 7-shaped vertical portion of each secondary hook facing away from the horizontal portion is a fourth inclined surface.

[0007] Preferably, both the second and fourth inclined surfaces are arc-shaped inclined surfaces.

[0008] Preferably, the horizontal portion of the 7-shaped biting hook has a plurality of first teeth on the side facing the vertical portion, and the horizontal portion of the 7-shaped biting hook has a plurality of second teeth that cooperate with the first teeth on the side facing the vertical portion. All the first teeth are arranged around a virtual circle A, the center of which is on the central axis of the table fixing part. All the second teeth are arranged around a virtual circle B, the center of which is on the central axis of the movable biting part. The deformation range of the elastic sealing ring is greater than the tooth height of the first teeth, and the deformation range of the elastic sealing ring is greater than the tooth height of the second teeth.

[0009] Preferably, the biting hook is provided with three first teeth;

[0010] On the plane of the horizontal portion of the 7-shaped part of the bite hook facing the vertical portion, the distance from the end of the end of the 7-shaped part of the bite hook that is relatively closer to the vertical portion of the bite hook to the end plane of the free end of the vertical portion of the bite hook is greater than the distance from the end of the end of the 7-shaped part of the bite hook that is relatively farther away from the vertical portion of the bite hook to the end plane of the free end of the vertical portion of the bite hook, and the height of each first tooth is equal.

[0011] The secondary hook is provided with three second teeth;

[0012] On the plane of the horizontal portion of the 7-shaped part of the secondary hook facing the vertical portion, the distance from the end of the 7-shaped part closer to the vertical portion of the secondary hook to the end plane of the free end of the vertical portion of the secondary hook is greater than the distance from the end of the 7-shaped part farther away from the vertical portion of the secondary hook to the end plane of the free end of the vertical portion of the secondary hook, and the height of each second tooth is equal.

[0013] Preferably, the upper end of the table fixing part has six hooks arranged in a circumferentially equidistant array on the circumferential surface.

[0014] Preferably, it also includes a fixing nut, and the table fixing part is provided with a second external thread below the hook, and the fixing nut is connected to the table fixing part through the second external thread.

[0015] Preferably, a mounting plate is coaxially sleeved inside the movable engagement part, and an expansion opening is coaxially provided at the upper end of the inner surface of the platform fixing part. The inner diameter of the expansion opening is larger than the inner diameter of the movable engagement part. A protrusion is provided on the circumferential surface of the lower end of the mounting plate. The distance from the side of the protrusion away from the mounting plate to the central axis of the mounting plate is greater than the outer diameter of the mounting plate and less than the inner diameter of the expansion opening. The mounting plate is provided with at least three through holes. The axis of the through holes is parallel to the axis of the movable engagement part. The lower section of the interior of the through hole is provided with internal threads, and the upper section of the interior of the through hole is smooth. A notch is provided on the mounting plate away from the three through holes.

[0016] Preferably, a flange is provided coaxially between the internal thread and the upper end of the through hole.

[0017] Preferably, it further includes an upper mounting tube, which is used to be inserted into the smooth part of the through hole. The lower end of the circumferential surface of the upper mounting tube is coaxially provided with a mounting recess, and a sealing ring is coaxially installed in the mounting recess. The outer diameter of the sealing ring is larger than the outer diameter of the upper mounting tube.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] This application designs a connector for a household faucet by using a hook on the fixed part of the countertop and a secondary hook on the movable engaging part to work with an elastic sealing ring. Compared to a threaded connection between the fixed part of the countertop and the movable engaging part, this design requires less than one turn of the screw, eliminating the need for bottom-up disassembly and replacement. Furthermore, because the angle of rotation during disassembly is minimal, the water pipes will not become tangled or damaged, making the design very convenient. This solves the problem of how to easily disassemble and replace components above the countertop (i.e., the movable engaging part and the faucet). Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this application installed on the mounting platform;

[0021] Figure 2 This is a schematic diagram of the structure of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the tabletop fixing part after it is separated from the movable engagement part in this application;

[0023] Figure 4 for Figure 3 Enlarged view at point E in the middle;

[0024] Figure 5 for Figure 3 Enlarged view at point F;

[0025] Figure 6 This is a structural schematic diagram of the movable interlocking part, the upper mounting tube, and the mounting plate in this application;

[0026] Figure 7 This is a top view of the active occlusal part;

[0027] Figure 8 for Figure 7 Sectional view of AA in the middle;

[0028] Figure 9 This is a schematic diagram showing the connection between the fixed part and the movable engaging part of the tabletop.

[0029] Figure 10 This is a structural diagram showing the tabletop fixing part and the movable interlocking part about to be disassembled and separated.

[0030] Figure 11 This application was installed on a mounting surface and a faucet was installed;

[0031] Figure 12 for Figure 11 A cover was installed inside;

[0032] Figure 13 A schematic diagram to illustrate the shell cover;

[0033] Figure 14 A diagram illustrating the function of the installation disk;

[0034] Figure 15 This is a schematic diagram of the hook structure in this application.

[0035] The components are as follows: 1. Tabletop fixing part; 2. Movable interlocking part; 3. Hook; 4. Secondary hook; 5. Elastic sealing ring; 6. First external thread; 7. First inclined surface; 8. Second inclined surface; 9. Third inclined surface; 10. Fourth inclined surface; 11. First meshing tooth; 12. Second meshing tooth; 13. Fixing nut; 14. Mounting plate; 15. Through hole; 16. Flange; 17. Upper mounting tube; 18. Mounting recess; 19. Mounting tabletop; 20. Second external thread; 21. Notch; 22. Protrusion; 23. Counterweight; 24. Mixing tube; 25. Faucet; 26. Shell cover. Detailed Implementation

[0036] Reference Figure 1 - Figure 15A connector for a household faucet includes a tubular countertop fixing part 1 and a tubular movable engaging part 2. At least three hooks 3 are provided on the circumferential surface of the upper end of the countertop fixing part 1. A secondary hook 4 that mates with each hook 3 is provided on the circumferential surface of the lower end of the movable engaging part 3. Each hook 3 is shaped like a "7", and each secondary hook 4 is shaped like an inverted "7". An elastic sealing ring 5 is coaxially arranged between the lower end of the movable engaging part 3 and the upper end of the countertop fixing part 1. When the secondary hook 4 engages with the hook 3, the elastic sealing ring 5 is compressed. The gap between two adjacent hooks 3 is greater than or equal to the length of the horizontal portion of the "7" shape of the secondary hook 4. A first external thread 6 is provided on the circumferential surface of the upper end of the movable engaging part 3 above the secondary hook 4.

[0037] In this embodiment, the countertop fixing part 1 is first installed on the mounting surface 19, with the hook 3 positioned above the mounting surface 19. Then, when the movable engaging part 2 needs to be installed, it is coaxially placed on the upper end of the countertop fixing part 1, with each secondary hook 4 positioned between two adjacent hooks 3. The movable engaging part 2 is then pressed towards the countertop fixing part 1, causing the elastic sealing ring 15 to deform. The movable engaging part 2 is then twisted, causing the hook 3 to engage the secondary hook 4. This method requires minimal force and few twists to coaxially fix the movable engaging part 2 to the countertop fixing part 1. The first external thread 6 is used to install the faucet 25. After the hook 3 engages the secondary hook 4, the presence of the elastic sealing ring 15 causes a tendency for the countertop fixing part 1 and the movable engaging part 2 bracket to separate, resulting in a stronger engagement between the hook 3 and the secondary hook 4. When replacement is needed, the user can replace the faucet 25 and the movable engagement part 2 together, which is more convenient. The existing technology cannot unscrew the movable engagement part 2, and in many designs, the movable engagement part 2 and the faucet are designed as one piece, so disassembly is very inconvenient. The fit between the hook 3 and the auxiliary hook 4 is simpler than using threads.

[0038] As a preferred embodiment, the angle between the vertical and horizontal portions of the hook 3 is an obtuse angle, and the angle between the vertical and horizontal portions of the sub-hook 4 is also an obtuse angle; the end face of the free end of the horizontal portion of each hook 3 is a first inclined surface 7, the first inclined surface 7 is parallel to the second inclined surface 8 of the vertical portion of the hook 3 that is provided with the first inclined surface facing away from the horizontal portion, the end face of the free end of the 7-shaped horizontal portion of each sub-hook 4 is a third inclined surface 9, and the inclined surface on the side of the 7-shaped vertical portion of each sub-hook 4 facing away from the horizontal portion is a fourth inclined surface 10.

[0039] The obtuse angle design facilitates the engagement between the hook 3 and the secondary hook 4. When installing the movable engagement part 2 and the tabletop fixing part 1, simply press the movable engagement part 2 towards the tabletop fixing part 1, causing the third inclined surface 9 of the secondary hook 4 to contact the first inclined surface 7 of the hook 3. This allows for easy twisting until the hook 3 and secondary hook 4 are properly engaged. During disassembly, press the movable engagement part 2 towards the tabletop fixing part 1 to compress the elastic sealing ring 5, then twist the movable engagement part 2 in the opposite direction. Afterward, the fourth inclined surface 10 on the secondary hook 4 contacts the second inclined surface 8 on the other hook 3. This allows the movable engagement part 2 to move away from the tabletop fixing part 1 during user twisting, enabling the removal of components inserted into the tabletop fixing part 1.

[0040] As a preferred embodiment, both the second inclined surface 8 and the fourth inclined surface 10 are curved inclined surfaces. With this design, when the second inclined surface 8 of an adjacent hook 3 comes into contact with the fourth inclined surface 10 of an adjacent sub-hook 4, the friction can be reduced compared to making both the second inclined surface 8 and the fourth inclined surface 10 flat.

[0041] As a preferred embodiment, the horizontal portion of the 7-shaped hook 3 has several first teeth 11 facing the vertical portion, and the horizontal portion of the 7-shaped secondary hook 4 has several second teeth 12 that engage with the first teeth 11. All the first teeth 11 are arranged around a virtual circle A, the center of which is on the central axis of the table fixing part 1. All the second teeth 12 are arranged around a virtual circle B, the center of which is on the central axis of the movable engagement part 2. The deformation range of the elastic sealing ring 5 is greater than the tooth height of the first teeth 11, and the deformation range of the elastic sealing ring 5 is greater than the tooth height of the second teeth 12. By setting the first teeth 11 and the second teeth 12, the engagement between the hook 3 and the secondary hook 4 is made more robust.

[0042] As a preferred embodiment, each of the bite hooks 3 is provided with three first teeth 11;

[0043] like Figure 15 As shown, on the plane of the horizontal portion of the 7-shaped part of the bite hook 3 facing the vertical portion, the distance from the end of the end of the 7-shaped part of the bite hook 3 that is relatively closer to the vertical portion of the 7-shaped part to the end plane of the free end of the vertical portion of the 7-shaped part of the bite hook 3 is greater than the distance from the end of the end of the 7-shaped part of the bite hook 3 that is relatively farther away from the vertical portion of the 7-shaped part to the end plane of the free end of the vertical portion of the 7-shaped part of the bite hook 3, and the height of each first tooth 11 is equal;

[0044] The secondary hook 4 is provided with three second teeth 12;

[0045] On the plane of the horizontal portion of the 7-shaped part of the secondary hook 4 facing the vertical portion, the distance from the end closer to the vertical portion of the 7-shaped part of the secondary hook 4 to the end plane of the free end of the vertical portion of the 7-shaped part of the secondary hook 4 is greater than the distance from the end farther away from the vertical portion of the 7-shaped part of the secondary hook 4 to the end plane of the free end of the vertical portion of the 7-shaped part of the secondary hook 4, and the height of each second tooth 12 is equal. After this setting, the engagement between the hook 3 and the secondary hook 4 will become increasingly tight, because the distance from the end closer to the vertical portion of the 7-shaped part of the hook 3 to the end plane of the free end of the vertical portion of the 7-shaped part of the hook 3 (let's assume it's Q) is greater than the distance from the end farther away from the vertical portion of the 7-shaped part of the hook 3 to the end plane of the free end of the vertical portion of the 7-shaped part of the hook (3) (let's assume it's P), Q > P. The setting of the first tooth 11 and the second tooth 12 effectively prevents the hook 3 and the secondary hook 4 from falling off.

[0046] As a preferred embodiment, six hooks 3 are arranged in a circumferentially equidistant array on the upper circumferential surface of the tabletop fixing part 1. The evenly distributed six hooks make the connection between the tabletop fixing part 1 and the movable engaging part 2 more stable.

[0047] As a preferred embodiment, a fixing nut 13 is also included. A second external thread 20 is provided on the tabletop fixing part 1 below the hook 3. The fixing nut 13 is connected to the tabletop fixing part 1 via the second external thread 20. By providing the fixing nut 13 to engage with the second external thread 20, it is convenient to install the tabletop fixing part 1 onto the mounting table 19.

[0048] As a preferred embodiment, a mounting plate 14 is coaxially sleeved inside the movable engagement part 2. An expansion opening is coaxially provided at the upper end of the interior of the table fixing part 1. The inner diameter of the expansion opening is larger than the inner diameter of the movable engagement part 2. A protrusion 22 is provided on the circumferential surface of the lower end of the mounting plate 14. The distance from the side of the protrusion 22 away from the mounting plate 14 to the central axis of the mounting plate 14 is greater than the outer diameter of the mounting plate 14 and smaller than the inner diameter of the expansion opening. The mounting plate 14 is provided with at least three through holes 15. The axis of the through holes 15 is parallel to the axis of the movable engagement part 2. The lower section of the interior of the through holes 15 is provided with internal threads, and the upper section of the interior of the through holes 15 is smooth. A notch 21 is provided on the mounting plate 14 away from the three through holes 15. The installation plate 14 facilitates the installation of water pipes within the movable engagement part 12. The design of the three through holes 15 allows two water pipes (hot water pipe and cold water pipe) entering from below the countertop fixing part 1 to pass through two through holes 15 to the top of the countertop fixing part 1 during use, and then connect to the faucet 25. The mixing valve core inside the faucet 25 regulates the water temperature by mixing the water in the hot water pipe and the cold water pipe. The mixed water enters the mixing pipe 24, which is then inserted into the lower part of the installation plate 14 through the remaining through hole 15, and then extends out from the notch 21 to the top of the installation plate 14. A counterweight 23 is set at the lower part of the mixing pipe 24 below the installation plate 14, which allows the mixing pipe 24 to be extended out of the installation plate 14. When not extended, it will retract to the lower part of the installation plate 14 under the action of the counterweight 23. The expansion port allows the mounting plate 14 to rotate relative to the movable engagement part 2 after the movable engagement part 2 is connected to the countertop fixing part 1. This prevents the mounting plate 14 from rotating with the movable engagement part 2 when it is turned, thus avoiding the various water pipes installed on the through hole 15 from getting tangled.

[0049] As a preferred embodiment, a flange 16 is provided coaxially within the through hole 15 between the internal thread and the upper end of the through hole 15. This flange 16 prevents over-insertion when connecting the water pipe.

[0050] As a preferred embodiment, an upper mounting tube 17 is also included. The upper mounting tube 17 is inserted into the smooth portion of the through hole. A mounting recess 18 is coaxially provided at the lower end of the circumferential surface of the upper mounting tube 17. A sealing ring is coaxially installed in the mounting recess 18, and the outer diameter of the sealing ring is larger than the outer diameter of the upper mounting tube 17. The sealing ring on the upper mounting tube 17 is designed to facilitate insertion into the through hole 15. The mounting recess 18 is designed to allow the sealing ring to be installed on the upper mounting tube 17. After the upper mounting tube 17 is installed, it can be directly connected to the water pipe inside the faucet during use.

[0051] Preferably, the device also includes a cover 26, the inner diameter of which is larger than the outer diameter of the movable engaging part 2, so as to cover the secondary hook 4 on the movable engaging part 2 and the bite hook 3 on the table fixing part 1. At the same time, the cover 26 is coaxially provided with a through hole, and the portion of the movable engaging part 2 with the first external thread 6 can pass through the through hole. Therefore, after the device is installed, the cover 26 can cover the secondary hook 4 and the bite hook 3, thereby preventing the secondary hook 4 and the bite hook 3 from being contacted by water or other impurities, thus playing a protective role.

Claims

1. A connector for a household faucet, characterized in that, The device includes a tubular tabletop fixing part (1) and a tubular movable engaging part (2). The upper end of the tabletop fixing part (1) is provided with at least three hooks (3). The lower end of the movable engaging part (3) is provided with a secondary hook (4) that cooperates with each hook (3). Each hook (3) is shaped like a 7. The secondary hooks (4) are all shaped like an inverted 7. An elastic sealing ring (5) is coaxially provided between the lower end of the movable engaging part (3) and the upper end of the tabletop fixing part (1). When the secondary hook (4) engages with the hook (3), the elastic sealing ring (5) is squeezed. The gap between two adjacent hooks (3) is greater than or equal to the length of the transverse part of the 7 shape of the secondary hook (4). The upper end of the movable engaging part (3) is provided with a first external thread (6) above the secondary hook (4).

2. The connector for a household faucet according to claim 1, characterized in that: The angle between the vertical and horizontal portions of the hook (3) is an obtuse angle, and the angle between the vertical and horizontal portions of the sub-hook (4) is also an obtuse angle; the end face of the free end of the horizontal portion of each hook (3) is a first inclined surface (7), the first inclined surface (7) is parallel to the second inclined surface (8) of the vertical portion of the hook (3) with the first inclined surface, which faces away from the horizontal portion; the end face of the free end of the 7-shaped horizontal portion of each sub-hook (4) is a third inclined surface (9), and the inclined surface on the side of the 7-shaped vertical portion of each sub-hook (4) facing away from the horizontal portion is a fourth inclined surface (10).

3. The connector for a household faucet according to claim 2, characterized in that: The second inclined plane (8) and the fourth inclined plane (10) are both arc-shaped inclined planes.

4. The connector for a household faucet according to claim 2, characterized in that: The hook (3) has a number of first teeth (11) on the horizontal part of the 7-shaped part facing the vertical part, and the secondary hook (4) has a number of second teeth (12) on the horizontal part of the 7-shaped part facing the vertical part, which cooperate with the first teeth (11). All the first teeth (11) are arranged around a virtual circle A, the center of which is on the central axis of the table fixing part (1). All the second teeth (12) are arranged around a virtual circle B, the center of which is on the central axis of the movable biting part (2). The deformation range of the elastic sealing ring (5) is greater than the tooth height of the first teeth (11). The deformation range of the elastic sealing ring (5) is greater than the tooth height of the second teeth (12).

5. The connector for a household faucet according to claim 2, characterized in that: The bite hook (3) is provided with three first teeth (11); On the plane of the horizontal portion of the 7-shaped part of the bite (3) facing the vertical portion, the distance from the end of the end of the vertical portion of the 7-shaped part of the bite (3) closer to the vertical portion of the bite (3) to the end plane of the free end of the vertical portion of the 7-shaped part of the bite (3) is greater than the distance from the end of the end of the vertical portion of the 7-shaped part of the bite (3) farther away from the vertical portion of the 7-shaped part of the bite (3) to the end plane of the free end of the vertical portion of the 7-shaped part of the bite (3), and the height of each first tooth (11) is equal; The secondary hook (4) is provided with three second teeth (12); On the plane of the horizontal portion of the 7-shaped part of the sub-hook (4) facing the vertical portion, the distance from the end of the vertical portion of the 7-shaped part of the sub-hook (4) closer to the end of the vertical portion of the 7-shaped part of the sub-hook (4) to the end plane of the free end of the vertical portion of the 7-shaped part of the sub-hook (4) is greater than the distance from the end of the vertical portion of the 7-shaped part of the sub-hook (4) farther away from the end of the vertical portion of the 7-shaped part of the sub-hook (4) to the end plane of the free end of the vertical portion of the 7-shaped part of the sub-hook (4), and the height of each second tooth (12) is equal.

6. The connector for a household faucet according to claim 1, characterized in that: The upper end of the table fixing part (1) has six hooks (3) arranged in a circumferentially equidistant array on the circumferential surface.

7. The connector for a household faucet according to claim 1, characterized in that: It also includes a fixing nut (13), and the table fixing part (1) is provided with a second external thread (20) below the hook (3). The fixing nut (13) is connected to the table fixing part (1) through the second external thread (20).

8. The connector for a household faucet according to claim 1, characterized in that: The movable engagement part (2) is coaxially fitted with a mounting plate (14). The upper end of the inner surface of the table fixing part (1) is coaxially provided with an expansion opening. The inner diameter of the expansion opening is larger than the inner diameter of the movable engagement part (2). The lower end of the mounting plate (14) is provided with a protrusion (22). The distance from the side of the protrusion (22) away from the mounting plate (14) to the central axis of the mounting plate (14) is greater than the outer diameter of the mounting plate (14) and smaller than the inner diameter of the expansion opening. The mounting plate (14) is provided with at least three through holes (15). The axis of the through holes (15) is parallel to the axis of the movable engagement part (2). The lower section of the inside of the through holes (15) is provided with internal threads. The upper section of the inside of the through holes (15) is smooth. The mounting plate (14) is provided with a notch (21) away from the three through holes (15).

9. A connector for a household faucet according to claim 8, characterized in that: A flange (16) is provided coaxially between the internal thread and the upper end of the through hole (15).

10. A connector for a household faucet according to claim 8, characterized in that: It also includes an upper mounting tube (17), which is used to insert into the smooth part of the through hole (15). The lower end of the circumferential surface of the upper mounting tube (17) is coaxially provided with a mounting recess (18), and a sealing ring is coaxially installed in the mounting recess (18). The outer diameter of the sealing ring is larger than the outer diameter of the upper mounting tube (17).

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