Magnetic attraction connection type water outlet connector

Abstract

The utility model discloses a magnetic attraction connection type water outlet connector which comprises an installation base, a water outlet head, a flexible hose and a magnetic attraction assembly, and the two ends of the flexible hose are connected with the installation base and the water outlet head respectively. The magnetic attraction assembly is arranged between the installation base and the water outlet head so that the installation base and the water outlet head can be connected in a magnetic attraction mode. The mounting seat is used for connecting a water source; incoming flow of the water source flows through the mounting seat, the flexible hose and the water outlet head in sequence and flows out. By the adoption of the scheme, the water outlet head and the installation base are connected through the magnetic attraction assembly, so that a balancing weight does not need to be arranged, the water outlet head is held by hand more conveniently, and the magnetic attraction connection type water outlet connector is more comfortable to use.

Description

Technical Field

[0001] The utility model belongs to the field of faucets, and particularly relates to a magnetic connection type water outlet connector. Background Art

[0002] A faucet is a switch for controlling the water flow and has the function of saving water. The replacement speed of faucets is very fast, developing from the old cast iron process to the electroplated knob type, and then to the stainless steel single-temperature single-control faucet, stainless steel double-temperature double-control faucet, and kitchen semi-automatic faucet. Now, more and more consumers will comprehensively consider various aspects such as material, function, and shape when purchasing a faucet.

[0003] Among them, the faucet with a pull-out head is the current mainstream type of faucet configured on kitchen sinks and washbasins. By arranging a flexible hose inside the steel pipe of the faucet, one end of the hose extends out of the steel pipe and is connected to the head, and a counterweight is arranged on the hose, so that the hose is pulled inward under the action of the counterweight, thereby ensuring that the head stably abuts against one end of the steel pipe for use in the state of not driving the head. In addition, the user can hold the head for use, so that the head can be manipulated to be in different positions and / or face different directions for a larger range of water outlet use, and the flexible characteristic of the hose can ensure stable water supply to the head in different positions and orientations.

[0004] However, due to the arrangement of the counterweight block, the hose is continuously subjected to the acting force of the counterweight block, and this acting force is transmitted to the head, resulting in a greater acting force required when holding the head by hand, making the hand-held feeling too heavy and affecting the comfort of use. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a magnetic connection type water outlet connector that realizes the connection between the water outlet head and the mounting seat through a magnetic component, so that there is no need to configure a counterweight block, making the hand-held water outlet head lighter and the use more comfortable.

[0006] To achieve the above purpose, the utility model provides the following technical solutions: including a mounting seat, a water outlet head, a flexible hose, and a magnetic component. The two ends of the flexible hose are respectively connected to the mounting seat and the water outlet head; the magnetic component is arranged between the mounting seat and the water outlet head to magnetically connect the mounting seat and the water outlet head; the mounting seat is used for connecting to a water source, and the incoming water flow of the water source flows through the mounting seat, the flexible hose, and the water outlet head in sequence and then flows out.

[0007] The utility model is further configured as follows: the magnetic attraction component includes a first magnet arranged on a mounting base and a second magnet arranged on a water outlet head; a first mounting groove is arranged at one end of the mounting base facing the water outlet head, and the first magnet is arranged in the first mounting groove; a second mounting groove is arranged at one end of the water outlet head facing the mounting base, and the second magnet is arranged in the second mounting groove.

[0008] The utility model is further configured as follows: a first flexible surface sticker is attached to the side of the first mounting groove facing the water outlet to enclose the first magnet in the first mounting groove; a second flexible surface sticker is attached to the side of the second mounting groove facing the mounting seat to enclose the second magnet in the second mounting groove.

[0009] The utility model is further configured as follows: the first flexible surface sticker and the second flexible surface sticker are arranged in a ring shape, and the flexible hose is located at the inner periphery of the first flexible surface sticker and the second flexible surface sticker.

[0010] The utility model is further configured as follows: there are multiple first magnets and first mounting grooves, and each of the first magnets and first mounting grooves is arranged in a ring shape with the flexible hose as the center; the second magnet and the second mounting groove are arranged in a ring shape, and the flexible hose is located at the inner periphery of the second magnet and the second mounting groove.

[0011] The utility model is further configured as follows: a built-in cavity is provided in the mounting seat, a built-in opening is provided at one end of the built-in cavity, the water outlet head is adsorbed on the mounting seat under the action of the magnetic attraction component to close the built-in opening, and the flexible hose is placed in the built-in cavity.

[0012] The utility model is further configured as follows: the water outlet head is provided with a guide portion protruding toward the built-in cavity, the guide portion is provided with a limiting section and a guide section, the guide section is located at the end of the limiting section away from the water outlet head, the outer circumference of the limiting section is cylindrical, and the outer circumference of the guide section gradually shrinks in the direction away from the water outlet head.

[0013] The utility model is further configured as follows: the water outlet head includes a second connecting pipe piece connected to the flexible hose and a locking piece for fixing the second connecting pipe piece; the water outlet head is provided with a connecting socket; the second connecting pipe piece is inserted into the connecting socket from the connecting socket toward one end of the built-in groove; the water outlet head is provided with an abutment portion in the connecting socket; the second connecting pipe piece is inserted into the connecting socket and abuts against the abutment portion for positioning; the outer peripheral wall of the locking piece is threadedly connected to the inner peripheral wall of the connecting socket; the locking piece abuts against the second connecting pipe piece to clamp the second connecting pipe piece between the abutment portion and the locking piece; and the guiding portion is provided on the locking piece.

[0014] The utility model is further configured as follows: a sealing ring is arranged between the abutting portion and the second connecting pipe member.

[0015] The present utility model is further configured as follows: A rotation-limiting surface is provided on the outer periphery of the second connecting pipe fitting, a rotation-limiting cavity adapted to the shape and size of the rotation-limiting surface is provided in the connecting jack, the rotation-limiting surface is fitted to the inner peripheral wall of the rotation-limiting cavity to limit the circumferential rotation of the second connecting pipe fitting, first anti-reverse engaging teeth are arranged in a circumferential arrangement on the end surface of the second connecting pipe fitting that abuts against the locking member, second anti-reverse engaging teeth are arranged in a circumferential arrangement on the end surface of the locking member that abuts against the second connecting pipe fitting, and the first anti-reverse engaging teeth and the second anti-reverse engaging teeth cooperate to restrict the locking member from moving away from the second connecting pipe fitting.

[0016] By adopting the above technical solutions: 1. When there is no need to manipulate and change the position and orientation of the water outlet head, under the action of the magnetic attraction assembly, the water outlet head is stably adsorbed on the mounting base, and the incoming water in the faucet body flows out through the mounting base, the flexible hose, and the water outlet head in sequence. 2. When the water outlet head is held by hand to different positions or different orientations, the suction effect of the magnetic attraction assembly is released, and the mounting base and the water outlet head are stably connected through the flexible hose to ensure stable water supply. In addition, the flexible hose itself is relatively light in weight, so that the gravity feeling of holding is close to the gravity of the water outlet head itself, the gravity feeling of holding is light, and the comfort is better. 3. Since no counterweight block is provided, the flexible hose will not be subjected to the hanging force generated by the counterweight block, thereby playing a protective role for the flexible hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a cross-sectional view of the specific embodiment of the present utility model;

[0019] Figure 2 It is an exploded view of the mounting base in the specific embodiment of the present utility model;

[0020] Figure 3 It is an exploded view of the water outlet head in the specific embodiment of the present utility model;

[0021] Figure 4 is Figure 1 an enlarged view of A in

[0022] Figure 5 is Figure 4 an enlarged view of B in

[0023] Figure 6 It is a part drawing of the second connecting pipe fitting in the specific embodiment of the present utility model;

[0024] Figure 7 This is the part drawing of the locking part in the specific embodiment of the present utility model;

[0025] Figure 8 This is the cross-sectional view of the water outlet head in the specific embodiment of the present utility model;

[0026] Figure 9 This is the assembly drawing of the present utility model assembled on the faucet body.

[0027] Label: 1, faucet body;

[0028] 2, mounting seat;

[0029] 21, first installation groove; 22, first flexible surface sticker; 23, built-in cavity;

[0030] 231, built-in opening;

[0031] 3, water outlet head;

[0032] 31, second installation groove; 32, second flexible surface sticker; 33, connection jack; 34, abutting part;

[0033] 331, rotation limiting cavity;

[0034] 4, flexible hose;

[0035] 5, magnetic attraction component;

[0036] 51, first magnet; 52, second magnet;

[0037] 6, guiding connection part;

[0038] 61, limiting section; 62, guiding section;

[0039] 71, first connecting pipe fitting; 72, second connecting pipe fitting;

[0040] 721, rotation limiting surface; 722, first anti-backflow locking tooth;

[0041] 8, locking part;

[0042] 81, second anti-backflow locking tooth;

[0043] 91, sealing ring; 92, anti-backflow surface; 93, guiding surface. Specific embodiment

[0044] To enable those skilled in the art to better understand the present utility model and thus more clearly define the scope of protection required by the present utility model, the present utility model will be described in detail below with respect to certain specific embodiments of the present utility model. It should be noted that the following are only some specific embodiments of the concept of the present utility model and only a part of the embodiments of the present utility model. The specific and direct descriptions of the relevant structures are only for the convenience of understanding the present utility model, and each specific feature does not of course and directly limit the scope of implementation of the present utility model. Conventional selections and substitutions made by those skilled in the art under the guidance of the concept of the present utility model shall be regarded as within the scope of protection required by the present utility model.

[0045] As Figures 1-9 shown, the present utility model discloses a magnetic adsorption connection type water outlet connector, which includes a mounting base 2, a water outlet head 3, a flexible hose 4, and a magnetic adsorption assembly 5. A threaded head is provided at the upper end of the mounting base 2, so that the mounting base 2 is threadedly connected to a water using device such as a faucet body 1 or a shower head through the threaded head. Among them, the schematic diagram of the mounting base 2 mounted on the faucet body 1 can be referred to Figure 9 shown. The two ends of the flexible hose 4 are respectively connected to the mounting base 2 and the water outlet head 3; the magnetic adsorption assembly 5 is arranged between the mounting base 2 and the water outlet head 3 to magnetically adsorb and connect the mounting base 2 and the water outlet head 3; the liquid from the faucet body 1 flows through the mounting base 2, the flexible hose 4, and the water outlet head 3 in sequence and then flows out.

[0046] Therefore, 1. When there is no need to manipulate and change the position and orientation of the water outlet head 3, under the action of the magnetic adsorption assembly 5, the water outlet head 3 is stably adsorbed on the mounting base 2, and the incoming flow in the faucet body 1 flows out through the mounting base 2, the flexible hose 4, and the water outlet head 3 in sequence. 2. When the water outlet head 3 is held by hand to different positions or different orientation states, the suction effect of the magnetic adsorption assembly 5 is released, and the mounting base 2 and the water outlet head 3 are stably connected through the flexible hose 4 to ensure stable water supply. In addition, the flexible hose 4 itself has a relatively light weight, so that the gravity feeling of holding is close to the gravity of the water outlet head 3 itself, and the gravity feeling of holding is light and the comfort is better. 3. Since no counterweight is provided, the flexible hose 4 will not be affected by the hanging force generated by the counterweight, thus playing a protective role for the flexible hose 4.

[0047] Specifically, the flexible hose 4 is made of silica gel material and is integrally spiral, so that the flexible hose 4 can provide a longer length in the stretched state to make the water supply range of the water outlet head 3 larger, and the flexible hose 4 is more compact in the spiral state and is easy to store.

[0048] Specifically, the magnetic attraction assembly 5 in this embodiment includes a first magnet 51 disposed on the mounting base 2 and a second magnet 52 disposed on the water outlet head 3; a first mounting groove 21 is provided at the lower end of the mounting base 2, and the first magnet 51 is disposed in the first mounting groove 21; a second mounting groove 31 is provided at the upper end of the water outlet head 3, and the second magnet 52 is disposed in the second mounting groove 31.

[0049] The magnetic attraction connection is realized by the attraction of the built-in first magnet 51 and the second magnet 52, and the installation of the magnets is more stable, and the built-in installation method plays a protective role for the magnets.

[0050] Preferably, the first magnet 51 and the second magnet 52 are strong magnets.

[0051] In other embodiments, one of the first magnet 51 and the second magnet 52 can be replaced with an iron plate.

[0052] In addition, a first flexible surface sticker 22 is attached to the side of the first mounting groove 21 facing the water outlet head 3 to enclose the first magnet 51 in the first mounting groove 21; a second flexible surface sticker 32 is attached to the side of the second mounting groove 31 facing the mounting base 2 to enclose the second magnet 52 in the second mounting groove 31. Thus, the first flexible surface sticker 22 and the second flexible surface sticker 32 are used to close the first mounting groove 21 and the second mounting groove 31 to further protect the first magnet 51 and the second magnet 52. In addition, since the first flexible surface sticker 22 and the second flexible surface sticker 32 have flexibility, not only will the first magnet 51 and the second magnet 52 not contact and impact when the water outlet head 3 and the mounting base 2 are attracted, but also there is a buffering effect when the water outlet head 3 and the mounting base 2 are attracted, further playing a protective role for the magnets.

[0053] Among them, the first flexible surface sticker 22 and the second flexible surface sticker 32 can be made of rubber pads or wool pads, etc.

[0054] Preferably, the first flexible surface sticker 22 and the second flexible surface sticker 32 in this embodiment are arranged in a ring shape, and the flexible hose 4 is located inside the first flexible surface sticker 22 and the second flexible surface sticker 32, so that the periphery of the flexible hose 4 is subjected to the action of the first flexible surface sticker 22 and the second flexible surface sticker 32 to ensure stability.

[0055] Specifically, the number of the first magnets 51 and the first mounting grooves 21 in this embodiment is multiple, and each first magnet 51 and the first mounting groove 21 are arranged in a ring shape centered on the flexible hose 4; the second magnet 52 and the second mounting groove 31 are arranged in a ring shape, and the flexible hose 4 is located inside the second magnet 52 and the second mounting groove 31.

[0056] In addition, an internal cavity 23 is provided in the mounting base 2 in this embodiment. An internal opening 231 is provided at one end of the internal cavity 23. The water outlet head 3 is adsorbed on the mounting base 2 under the action of the magnetic attraction assembly 5 to close the internal opening 231, and the flexible hose 4 is placed in the internal cavity 23.

[0057] Therefore, the setting of the internal cavity 23 provides a storage space for the flexible hose 4, plays a protective role for the flexible hose 4, and prevents the flexible hose 4 from being exposed and damaged when the water outlet head 3 and the mounting base 2 are in a suction state.

[0058] In addition, a connecting portion 6 is convexly provided on the water outlet head 3 in this embodiment and faces the internal cavity 23. The connecting portion 6 is provided with a limiting section 61 and a guiding section 62. The guiding section 62 is located at one end of the limiting section 61 away from the water outlet head 3. The outer periphery of the limiting section 61 is cylindrical, and the outer periphery of the guiding section 62 gradually shrinks in a direction away from the water outlet head 3. When the water outlet head 3 is attracted to the mounting base 2, it first aligns through the connecting section, and after the alignment is completed, radial limitation is carried out through the cooperation of the limiting section 61 and the inner peripheral wall of the internal cavity 23, so that the magnetic attraction force between the first magnet 51 and the second magnet 52 is more stable.

[0059] In addition, the water outlet head 3 in this embodiment includes a second connecting pipe member 72 and a locking member 8. The flexible hose 4 is sleeved on the second connecting pipe member 72 to realize the connection of the flow channel. The water outlet head 3 is provided with a connection jack 33. The second connecting pipe member 72 is inserted into the connection jack 33 from the upper end of the connection jack 33. The water outlet head 3 is provided with an abutting portion 34 in the connection jack 33. The second connecting pipe member 72 is inserted into the connection jack 33 and abuts against the abutting portion 34 downward for positioning. The outer peripheral wall of the locking member 8 is threadedly connected to the inner peripheral wall of the connection jack 33, and the locking member 8 abuts against the second connecting pipe member 72 from top to bottom to clamp the second connecting pipe member 72 between the abutting portion 34 and the locking member 8.

[0060] Therefore, the flexible hose 4 and the water outlet head 3 are connected through the second connecting pipe member 72, and the locking member 8 is used to ensure the stable installation of the second connecting pipe member 72 on the water outlet head 3.

[0061] Preferably, the connecting portion 6 in this embodiment is integrally formed on the locking member 8, so that the radial space of the connecting portion 6 overlaps with the radial space of the connection jack 33, and thus the structure is more compact.

[0062] Similarly, a first connecting pipe member 71 is clamped and bonded at the upper end of the internal cavity 23 of the mounting base 2, so that the flexible hose 4 is sleeved on the first connecting pipe member 71 to realize the connection of the flow channel.

[0063] Preferably, a sealing ring 91 is provided between the abutting portion 34 and the second connecting pipe member 72 in this embodiment, so that the sealing effect between the two is better.

[0064] In addition, a rotation-limiting surface 721 is provided on the outer periphery of the second connecting pipe fitting 72 in this embodiment. A rotation-limiting cavity 331 adapted to the shape and size of the rotation-limiting surface 721 is provided in the connection jack 33. The rotation-limiting surface 721 is fitted to the inner peripheral wall of the rotation-limiting cavity 331 to limit the circumferential rotation of the second connecting pipe fitting 72. On the end surface of the second connecting pipe fitting 72 that abuts against the locking member 8, first anti-reverse teeth 722 are arranged in a circumferential arrangement. On the end surface of the locking member 8 that abuts against the second connecting pipe fitting 72, second anti-reverse teeth 81 are arranged in a circumferential arrangement. The first anti-reverse teeth 722 and the second anti-reverse teeth 81 cooperate to restrict the locking member 8 from moving away from the second connecting pipe fitting 72. Therefore, through the cooperation of the rotation-limiting surface 721 and the rotation-limiting cavity 331, the second connecting pipe fitting 72 cannot rotate circumferentially. Thus, during the downward rotation of the locking member 8, the second anti-reverse teeth 81 rotate and sequentially cross the fixed first anti-reverse teeth 722, so that the upward rotation of the locking member 8 is restricted by the cooperation of the first anti-reverse teeth 722 and the second anti-reverse teeth 81, so as to realize that the locking member 8 and the second connecting pipe fitting 72 cannot be disassembled and ensure the stability of the installation of the second connecting pipe fitting 72.

[0065] Specifically, the shapes of the rotation-limiting surface 721 and the rotation-limiting cavity 331 in this embodiment are in a runway shape, and other embodiments may also adopt shapes such as a polygonal prism.

[0066] Preferably, the first anti-reverse teeth 722 in this embodiment are arranged in an arc shape, and the second anti-reverse teeth 81 are arranged in a ring shape, which not only ensures the clamping cooperation between the first anti-reverse teeth 722 and the second anti-reverse teeth 81 in any state, but also prevents the excessive number of the first anti-reverse teeth 722 from making it too difficult for the locking member 8 to rotate.

[0067] Among them, the first anti-reverse teeth 722 and the second anti-reverse teeth 81 are both provided with anti-reverse surfaces 92 parallel to the vertical direction and inclined guiding surfaces 93, so that during the downward spiral process of the locking member 8, the second anti-reverse teeth 81 cross the first anti-reverse teeth 722 through the guiding surfaces 93, and during the upward spiral process of the locking member 8, the second anti-reverse teeth 81 are restricted from crossing the first anti-reverse teeth 722 through the anti-reverse surfaces 92, so as to realize the one-way movement of the locking member 8.

[0068] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A magnetic connection type water outlet connector, characterized in that: The utility model comprises a mounting seat (2), a water outlet head (3), a flexible hose (4), and a magnetic attraction component (5); the two ends of the flexible hose (4) are respectively connected to the mounting seat (2) and the water outlet head (3); the magnetic attraction component (5) is arranged between the mounting seat (2) and the water outlet head (3) to magnetically connect the mounting seat (2) and the water outlet head (3); The mounting seat (2) is used to connect to a water source, and the water source flows through the mounting seat (2), the flexible hose (4) and the water outlet (3) in sequence and then flows out.

2. The magnetic connection type water outlet connector according to claim 1, characterized in that: The magnetic attraction component (5) comprises a first magnet (51) arranged on the mounting seat (2) and a second magnet (52) arranged on the water outlet head (3); A first mounting groove (21) is provided at one end of the mounting seat (2) facing the water outlet head (3), and the first magnet (51) is arranged in the first mounting groove (21); A second mounting groove (31) is provided at one end of the water outlet head (3) facing the mounting seat (2), and the second magnet (52) is arranged in the second mounting groove (31).

3. The magnetic connection type water outlet connector according to claim 2, characterized in that: A first flexible surface sticker (22) is attached to a side of the first installation groove (21) facing the water outlet head (3) so as to seal the first magnet (51) in the first installation groove (21); A second flexible surface sticker (32) is attached to one side of the second installation groove (31) facing the installation seat (2) so as to seal the second magnet (52) in the second installation groove (31).

4. The magnetic connection type water outlet connector according to claim 3, characterized in that: The first flexible surface patch (22) and the second flexible surface patch (32) are arranged in a ring shape, and the flexible hose (4) is located inside the first flexible surface patch (22) and the second flexible surface patch (32).

5. The magnetic connection type water outlet connector according to any one of claims 2 to 4, characterized in that: The number of the first magnets (51) and the first mounting grooves (21) is plural, and the first magnets (51) and the first mounting grooves (21) are arranged in a ring shape with the flexible hose (4) as the center. The second magnet (52) and the second installation groove (31) are arranged in an annular shape, and the flexible hose (4) is located inside the second magnet (52) and the second installation groove (31).

6. The magnetic connection type water outlet connector according to claim 1, characterized in that: The mounting seat (2) is provided with a built-in cavity (23), one end of the built-in cavity (23) is provided with a built-in opening (231), and the water outlet head (3) is adsorbed on the mounting seat (2) under the action of the magnetic attraction component (5) to close the built-in opening (231), and the flexible hose (4) is placed in the built-in cavity (23).

7. The magnetic connection type water outlet connector according to claim 6, characterized in that: The water outlet head (3) is provided with a guide portion (6) protruding toward the built-in cavity (23); the guide portion (6) is provided with a limit section (61) and a guide section (62); the guide section (62) is located at an end of the limit section (61) away from the water outlet head (3); the outer circumference of the limit section (61) is cylindrical; and the outer circumference of the guide section (62) gradually decreases in a direction away from the water outlet head (3).

8. The magnetic connection type water outlet connector according to claim 7, characterized in that: The water outlet head (3) comprises a second connecting pipe member (72) connected to the flexible hose (4) and a locking member (8) for fixing the second connecting pipe member (72). The water outlet head (3) is provided with a connecting socket (33). The second connecting pipe member (72) is inserted into the connecting socket (33) from one end of the connecting socket (33) toward the built-in groove. The water outlet head (3) is provided with an abutment portion (34) located in the connecting socket (33). The second connecting pipe member (72) is inserted into the connecting socket (33) and abuts against the abutment portion (34) for positioning. The outer peripheral wall of the locking member (8) is threadedly connected to the inner peripheral wall of the connecting socket (33). The locking member (8) abuts against the second connecting pipe member (72) to clamp the second connecting pipe member (72) between the abutment portion (34) and the locking member (8). The guide portion (6) is provided on the locking member (8).

9. The magnetic connection type water outlet connector according to claim 8, characterized in that: A sealing ring (91) is provided between the abutting portion (34) and the second connecting pipe member (72).

10. The magnetic connection type water outlet connector according to claim 8, characterized in that: The outer circumference of the second connecting pipe (72) is provided with a limited rotation surface (721), and the connecting socket (33) is provided with a limited rotation cavity (331) whose shape and size are matched with the limited rotation surface (721). The limited rotation surface (721) cooperates with the inner circumferential wall of the limited rotation cavity (331) to limit the circumferential rotation of the second connecting pipe (72). The end surface of the second connecting pipe (72) abutting against the locking member (8) is provided with a first non-return tooth (722) arranged along the circumferential direction, and the end surface of the locking member (8) abutting against the second connecting pipe (72) is provided with a second non-return tooth (81) arranged along the circumferential direction. The first non-return tooth (722) and the second non-return tooth (81) cooperate to limit the locking member (8) from moving in a direction away from the second connecting pipe (72).

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