Telescopic water passing structure of bent pipe and telescopic hardware fitting

Abstract

The utility model provides a water passing structure with a telescopic bent pipe. The water passing structure comprises a bendable upper inner pipe, a water passing connector and a lower inner pipe of an elastic structure with the telescopic length. The upper inner pipe and the lower inner pipe are connected through the water passing connector. The utility model provides the lower inner pipe with the elastic structure, the stretching and shortening of the elastic structure can cause the overall stretching and shortening of the water passing structure, and the structure avoids excessive interfaces, so that the overall sealing performance of the water passing structure is ensured. The utility model further discloses a hardware fitting comprising the bent pipe telescopic water passing structure.

Description

TECHNICAL FIELD

[0001] The present application relates to hardware fittings, in particular to the overall structure of kitchen and bathroom hardware fittings and the component structure thereof. BACKGROUND

[0002] Faucets and shower rods are important hardware fittings. Traditional structures are made of copper or other metals, and after forming, bacteria and scale can easily breed inside with use, hindering continued use, and the overall abandonment causes waste. In addition, some metal fittings are electroplated on the outer surface, and the inner surface may also be electroplated during operation and not be discovered, and water passing through such electroplated materials will be contaminated and not meet environmental protection requirements. CONTENT OF THE UTILITY MODEL

[0003] One purpose of the present application is to solve one of the above problems, and an improved flexible water passing structure of a bent pipe is proposed.

[0004] To achieve the above purpose, an embodiment of the present application proposes a flexible water passing structure of a bent pipe, which comprises an upper inner pipe, a water passing joint and a lower inner pipe; one end of the upper inner pipe is fixed to a first end of the water passing joint; the upper end of the lower inner pipe is fixed to a second end of the water passing joint opposite to the first end; wherein the upper inner pipe is bendable, and the upper inner pipe is made of a flexible material; wherein the lower inner pipe has an elastic structure with a telescopic length.

[0005] In some embodiments, the elastic structure comprises a spiral elastic structure and a linear elastic structure.

[0006] In some embodiments, the linear elastic structure comprises a series of disc-shaped telescopic units.

[0007] In some embodiments, the upper inner pipe comprises a curved inner pipe portion and a straight inner pipe portion in communication with each other, the free end of the straight inner pipe portion serving as the water inlet end of the upper inner pipe, and the free end of the curved inner pipe portion serving as the water outlet end of the upper inner pipe; a first intermediate fastener is further included, which fastens and connects the water inlet end of the upper inner pipe to the first end of the water passing joint from the outer periphery of the upper inner pipe; the first end of the water passing joint has an upper protruding portion that extends into the water inlet end of the upper inner pipe when cooperating with the upper inner pipe, and the upper inner pipe is sleeved on the protruding portion, and the water inlet end of the upper inner pipe is fastened and connected to the upper protruding portion by the first intermediate fastener from the outer periphery of the upper inner pipe, thereby being fixed to the water passing joint.

[0008] In some embodiments, the upper protruding part of the water passing joint comprises an upper protruding mouth connecting the upper inner tube and fixed by the first intermediate fastener, and an upper protruding platform with a larger radial dimension than the upper protruding mouth is arranged at the rear side of the upper protruding mouth, and the upper protruding platform is arranged for connecting the upper outer tube; the water passing joint further comprises a lower protruding part arranged opposite to the upper protruding part, the lower protruding part comprises a lower protruding mouth for connecting the lower inner tube, and the lower protruding mouth is provided with a lower protruding platform with a larger radial dimension at the front side, and the water outlet end of the lower inner tube is coupled and communicated with the second end of the water passing joint (6) through a second intermediate fastener, and the second intermediate fastener is fixed to the lower protruding platform.

[0009] In some embodiments, the outer edge of the upper protruding platform is provided with a connecting structure, such as a thread or a bayonet arranged at the outer edge of the upper protruding platform, and a radially enlarged upper flange is arranged at the rear side of the upper protruding platform, and the front end surface of the upper flange is engaged with the lower end surface of the upper outer tube, for example.

[0010] In some embodiments, the radial dimension of the upper flange is larger than the radial dimension of the upper outer tube.

[0011] Some other embodiments of the present application provide a telescopic hardware fitting, which is a shower rod matched with a bathroom faucet or a water outlet pipe matched with a kitchen faucet; the telescopic hardware fitting comprises the telescopic water passing structure of any one of the above-mentioned embodiments, and an upper outer tube sleeved outside the upper inner tube, the internal configuration of the upper outer tube is consistent with the external configuration of the upper inner tube, and comprises a curved outer tube part and a straight outer tube part connected as a whole; the straight outer tube part is fixedly connected with the water passing joint; a sleeve is frictionally fitted at the outer side of the straight outer tube part as the limiting structure; the sleeve is fixed to the sleeve part of the mounting sleeve in the circumferential direction, and the mounting sleeve further comprises a connecting rod part extending transversely from the sleeve part, and the connecting rod part is fixed to the mounting seat; the length of the sleeve is smaller than that of the sleeve part, and the lower part of the sleeve part of the mounting sleeve is provided with a matching structure for matching with the upper end part of the lower outer tube in a straight tube shape as a whole.

[0012] In some embodiments, a water outlet joint is fixed to the water outlet end of the upper inner tube through a water outlet fastener, and the water outlet joint has an enlarged end part matched with the end surface of the water outlet end of the upper outer tube.

[0013] In some embodiments, the lower end of the lower outer tube is fixedly connected with a water inlet joint, the water inlet joint comprises a base portion and an upper extension portion, the lower outer tube and the lower inner tube are fixedly connected at different height positions of the upper extension portion respectively, and the base portion is sleeved with a water inlet nut; the base portion comprises a bottom support, the diameter of the bottom support is greater than the upper opening of the water inlet nut, the upper extension portion comprises a conical portion and a cylindrical portion; the conical portion is located at the lower outer tube, and the cylindrical portion is fixedly connected with the lower inner tube through a water inlet fastener.

[0014] In some embodiments, the larger radial position of the lower portion matches the lower outer tube, and the smaller radial position of the lower portion matches the upper flange.

[0015] The beneficial effects of the present application include: the water passing inner tube assembly is made of environmentally friendly materials, and all water passing tubes are free of plating or coating. The lower inner tube with elastic structure is provided, the number of interfaces is reduced, and the overall sealing of the water passing inner tube assembly before and after stretching is more easily ensured.

[0016] The above is only a brief summary of the beneficial effects of the present application, and other advantages and effects of the embodiments of the present application will become apparent through the subsequent detailed description of the relevant embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of a telescopic hardware fitting comprising a telescopic water outlet structure with a bent pipe according to an embodiment of the present application.

[0018] Figure 2 is a schematic diagram of the exploded structure of a telescopic hardware fitting comprising a telescopic water outlet structure with a bent pipe according to an embodiment of the present application.

[0019] Figure 3 is a schematic diagram of the structure of a telescopic hardware fitting comprising a telescopic water outlet structure with a bent pipe according to an embodiment of the present application.

[0020] Figure 4 is Figure 3 an enlarged view of part A of the sectional view.

[0021] Figure 5 is Figure 3 an enlarged view of part B of the sectional view.

[0022] Figure 6 is Figure 3 an enlarged view of part D of the sectional view.

[0023] Figure 7 is Figure 3 an enlarged view of part C of the sectional view.

[0024] Figure 8is a structure schematic view of a retractable hardware fitting including the retractable elbow water outlet structure of the present application in a shortened state.

[0025] Figure 9 is a structure schematic view of a retractable hardware fitting including the retractable elbow water outlet structure of the present application in an extended state.

[0026] Figure 10 is a structure schematic view of a retractable hardware fitting including the retractable elbow water outlet structure of the present application in a shortened state.

[0027] Figure 11 is Figure 10 is a structure sectional view of the E part in the middle.

[0028] Figure 12 is a structure schematic view of a retractable hardware fitting including the retractable elbow water outlet structure of the present application in an extended state. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be described below in detail with reference to the accompanying drawings.

[0030] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described in detail below with reference to the accompanying drawings of the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0031] In the embodiments of the present application, the terms “first” and “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0032] In addition, in the embodiments of the present application, the orientation terms such as “up”, “down”, “left” and “right” are defined with respect to the orientation of the components shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0033] In the embodiments of the present application, unless otherwise specified and limited, the term “connection” should be understood in a broad sense, for example, “connection” can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium.

[0034] In the embodiments of the present application, the terms "comprising", "containing" or any other similar words are intended to encompass non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes the elements inherent to such process, method, article or device. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0035] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words such as "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

[0036] Referring to Figure 1 , Figure 2 , Figure 3 , according to an embodiment of the present application, the telescopic tap 200 includes a curved pipe telescopic water passing structure, which includes a bendable upper inner pipe 2, a water passing joint 6 and a lower inner pipe. The water inlet end 23 of the upper inner pipe 2 is coupled and communicated with the first end 61 of the water passing joint 6 through a first intermediate fastener 32, such as a copper ring, and the water outlet end of the lower inner pipe 7 is coupled and communicated with the second end of the water passing joint 6 through a second intermediate fastener 33, such as a copper ring. In this way, a water passing waterway is formed from the lower inner pipe 7 to the water passing joint 6 and to the upper inner pipe 2.

[0037] As shown in Figure 2 , the bendable upper inner pipe 2 includes a curved inner pipe portion 2A and a straight inner pipe portion 2B which are in communication with each other, and the two portions can be integrated. The free end of the straight inner pipe portion 22 serves as the water inlet end 23 of the upper inner pipe, and the free end of the curved inner pipe portion serves as the water outlet end 24 of the upper inner pipe. The upper inner pipe 2 can be made of a material with better flexibility, such as polyethylene (PE), especially a material with a minimum bending radius of 140 mm, such as cross-linked polyethylene (PEX) material, such as PEX-A, PEX-B, PEX-C, etc. Because the internal configuration of the upper outer pipe 1 is generally consistent with the external configuration of the upper inner pipe 2, when the PEX material is used, the upper inner pipe can pass through the curved upper outer pipe at room temperature, and when the PE material is used, the upper inner pipe can pass through the curved upper outer pipe after being heated.

[0038] As shown in Figure 6 , Figure 7As shown, the lower inner tube 7 can include a water inlet interface portion 71, a water outlet interface portion 72, and an elastic structure 73 between the water inlet interface portion 71 and the water outlet interface portion 72. As shown in Figure 2 , Figure 3 As shown, in some embodiments, the elastic structure 73 is a helical elastic tube in a spring-like configuration, which can be formed by, for example, molding modified rubber, silicone, or polymeric materials. When stretched, the elastic tube will elongate, and when the stretching force is removed, the elastic tube will shorten. The elastic structure 73 can be made of rubber, silicone, or other elastic polymeric materials, such as PEX.

[0039] As shown in Figure 7 , the first end of the water pass joint 6 has an upper protruding portion 61 that extends into the water inlet end 23 of the upper inner tube 2 when the two are mated. After the upper inner tube 2 is fitted over the protruding portion 61, the water inlet end 23 of the upper inner tube is fixedly connected to the protruding portion 61 by the first intermediate fastener 32, thereby securing the upper inner tube 2 to the water pass joint 6.

[0040] As shown in Figure 7 , the upper protruding portion 61 of the water pass joint 6 includes an upper protruding mouth 611 that connects the upper inner tube 2 and is secured by the first intermediate fastener 32. On the rear side of the upper protruding mouth 611 (where "rear side" refers to the side that is farther away from the upper inner tube, such as the lower side in any of the drawings, and "front side" refers to the side that is closer to the upper inner tube, such as the upper side in any of the drawings), a radially larger upper boss 612 is provided, which is configured to connect the upper outer tube. To this end, the outer edge of the upper boss 612 can be provided with a connection structure, such as threads or a bayonet, etc. On the rear side of the upper boss 612, a radially enlarged upper flange 613 is provided, and the front end face of the upper flange 613 is, for example, in abutment with the lower end face of the upper outer tube. In some embodiments, the radial dimension of the upper flange 613 is larger than the outer diameter of the upper outer tube 1.

[0041] As shown in Figure 7 , the water pass joint 6 further includes a lower protruding portion 62 that is disposed opposite the upper protruding portion 61. The lower protruding portion 62 includes a lower protruding mouth 621 that is configured to connect the lower inner tube 7. The lower protruding mouth 621 is provided with a radially larger lower boss 622 on the front side, and the second intermediate fastener 33 is fixed to the lower boss 622.

[0042] The basic working principle of the flexible elbow water passing structure is as follows: the lower inner tube 7 is fixed to the water outlet part of the faucet through the water inlet joint 8, and the upper inner tube 2 is driven to move upward through the water passing joint 6 and the lower inner tube 7, so as to lengthen the elastic structure 73 of the lower inner tube 7, thereby realizing the elongation of the flexible elbow water passing structure, and the reverse operation can realize the shortening.

[0043] In some embodiments, as shown in Figure 4 The upper inner tube water outlet end 24 is provided with a water outlet joint 4, which is fixed to the upper inner tube water outlet end 24 through a water outlet fastener 31.

[0044] Figure 1 、 Figure 2 、 Figure 3 The structure diagram of the flexible hardware fitting 200 comprising the flexible elbow water passing structure in the above embodiments is shown, which can be, for example, a shower rod matched with a bathroom faucet, or a water outlet pipe as a kitchen faucet.

[0045] As shown in Figure 1 、 Figure 2 In addition to comprising the flexible elbow water passing structure, the hardware fitting 200 further comprises an upper outer tube 1 sleeved outside the upper inner tube 2, the internal configuration of the upper outer tube 1 is generally consistent with the external configuration of the upper inner tube 2, for example, it can comprise a curved outer tube part 1A and a straight outer tube part 1B connected as a whole. The upper outer tube water outlet end is provided in the curved outer tube part 1A. As shown in Figure 4 The water outlet joint 4 can be made of high-strength material, such as metal material, metal-like material, for example, POM material, and is fixed to the upper inner tube water outlet end 24 through the water outlet fastener 31, for example, the water outlet joint 4 can have an enlarged end portion matched with the end face of the upper outer tube water outlet end. The upper outer tube water outlet end can have an external thread to connect a shower head part.

[0046] As shown in Figure 5 、 Figure 7As shown, the straight outer pipe part 1B is connected with the upper boss 612 to be fixedly connected with the water passing joint, for example by corresponding threads or bayonet structure. A pipe sleeve 10 is frictionally fitted on the outer side of the straight outer pipe part 1B, and the pipe sleeve 10 serves as the limiting structure, which can be made of POM material and is in transition fit or clearance fit with the straight outer pipe part 1B. The pipe sleeve 10 is fixed in the circumferential direction to the sleeve part 121 of the mounting sleeve 12, and the mounting sleeve 12 further includes a connecting rod part 122 extending transversely from the sleeve part 121, which can be fixed to the mounting base 11. The mounting base 11 is fixed laterally, for example to a wall surface. The mounting sleeve 12 and the mounting base 11 can both be made of zinc alloy. As shown in the figure, Figure 5 As shown, the length of the pipe sleeve 10 in the length direction, i.e. the size in the up-down direction, is smaller than that of the sleeve part 121, so that the lower part 1211 of the sleeve part 121 provides a position for connecting with the lower outer pipe 13. For example, the lower part 1211 of the sleeve part 121 of the mounting sleeve 12 is provided with a matching structure, for example threads, which can be matched with the upper end part 131 of the lower outer pipe 13 to be integrated.

[0047] As shown, Figure 6 As shown, the lower end part 132 of the lower outer pipe 13 can be fixedly connected with the water inlet joint 8, which can include a base part 81 and an upper extension part 82, and the lower outer pipe 13 and the lower inner pipe 7 are fixed to different height positions of the upper extension part respectively, and the base part 81 is sleeved with the water inlet nut 9. The water inlet joint 8 is made of high-strength material, for example metal material such as copper, stainless steel, similar metal material such as POM material, etc. The base part 81 can include a bottom support, the diameter of which is larger than that of the upper opening of the water inlet nut 9, and the upper extension part 82 can include a cone part and a column part. The cone part is fixed to the lower end part 132 of the lower outer pipe 13, and the column part is fixed to the water inlet end of the lower inner pipe 7 by a water inlet fastener 34.

[0048] The working principle of the hardware fitting including the flexible elbow water outlet structure of the embodiments of the present application is as follows: the upper inner pipe 2 is inserted into the upper outer pipe 1, the water outlet joint 4 is fixed to the end parts of the upper inner pipe and the upper outer pipe by a water outlet fastener 31, for example a copper ring, to form an upper part; the water inlet end of the lower outer pipe, the water inlet end of the lower inner pipe and the water inlet nut 9 are all fixed to the water inlet joint 8 to form a lower part; the pipe sleeve 10 is fixedly arranged in the mounting sleeve 12; the thin-walled intermediate pipe is matched into the space between the lower inner pipe 7 and the lower outer pipe 13, and then the water passing joint end thereof is connected with the upper inner pipe 2 and the water inlet end of the upper outer pipe to be integrated to realize sliding together in the pipe sleeve 10; finally, the mounting sleeve 12 is fixed to the mounting base 13 by locking with the locking member 14, and the water inlet nut 9 is fixed to the faucet water outlet part.

[0049] like Figure 8 , Figure 9 shown, since Figure 8 As shown, by pulling up the upper outer tube 1, the upper inner tube 2, the water inlet connector 6, and the lower inner tube 7 can move upwards along the lower outer tube 13, thereby extending the length of the entire hardware fitting. In embodiments where the radial dimension of the upper flange 613 is larger than the outer diameter of the upper outer tube 1, when the water inlet connector 6 abuts against the lower end face 1211 of the outer sleeve 121 of the sleeve 10, it can no longer move upwards. Figure 9 The position shown. The telescopic adjustable height can be determined based on the height of the thin-walled intermediate tube 6. For a shower rod, it can be 400mm, and for a faucet rod, it can be shorter.

[0050] Another embodiment of the retractable hardware fitting 200 for the retractable water passage structure with a bend is as follows: Figure 10 , Figure 11 , Figure 12 As shown. In this embodiment, the elastic structure 73 of the lower inner tube 7 can be a linear elastic structure, and the water outlet 72 of the lower inner tube 7 is connected to the water inlet connector. The linear elastic structure can, for example, be composed of series of disc-shaped telescopic units. The disc-shaped telescopic units can, for example, have a configuration of mutually opposing discs or a configuration of a single disc. Straight pipe sections can be provided or not provided between adjacent disc-shaped telescopic units. When stretched, such as Figure 12 As shown, the radial dimension of the disc-shaped telescopic unit decreases while the axial dimension increases, and when compressed, as... Figure 11 As shown, the radial dimension of the disc-shaped telescopic unit increases while the axial dimension decreases.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A retractable water-passing structure with a curved pipe, characterized in that: It includes an upper inner tube (2), a water inlet connector (6), and a lower inner tube (7); one end of the upper inner tube (2) is fixed to the first end of the water inlet connector (6); the upper end of the lower inner tube (7) is fixed to the second end of the water inlet connector (6) opposite to the first end; wherein, the upper inner tube (2) is flexible and is made of flexible material; wherein, the lower inner tube (7) has an elastic structure with a length that can be stretched.

2. The retractable water-passing structure with a curved pipe according to claim 1, characterized in that: The elastic structure includes a spiral elastic structure and a linear elastic structure.

3. The retractable water-passing structure with a curved pipe according to claim 2, characterized in that: The linear elastic structure includes a series of dish-shaped retractable units.

4. The retractable water-passing structure with a curved pipe according to claim 1, characterized in that: The upper inner tube (2) includes a curved inner tube section (21) and a straight inner tube section (22) that are interconnected. The free end of the straight inner tube section (22) serves as the water inlet end (23) of the upper inner tube, and the free end of the curved inner tube section serves as the water outlet end (24) of the upper inner tube. It also includes a first intermediate fastener (32), which securely connects the water inlet end (23) of the upper inner tube (2) to the first end of the water connector (6) from the outer periphery of the upper inner tube (2). The first end of the water connector (6) has an upper protrusion (61) that extends into the water inlet end (23) of the upper inner tube (2) when it is engaged with the upper inner tube (2). After the upper inner tube (2) is sleeved on the protrusion (61), the water inlet end (23) of the upper inner tube is securely connected to the upper protrusion (61) from the outer periphery of the upper inner tube (2) by the first intermediate fastener (32) and then fixed to the water connector (6).

5. The retractable water-passing structure with a curved pipe according to claim 4, characterized in that: The upper protrusion (61) of the water connector (6) includes an upper protrusion (611), which is connected to the upper inner tube (2) and fixed by the first intermediate fastener (32). An upper boss (612) with a radial dimension larger than the upper protrusion (611) is provided on the rear side of the upper protrusion (611). The upper boss (612) is provided to connect to the upper outer tube. The water connector (6) also includes a lower protrusion (62) which is provided opposite to the upper protrusion (61). The lower protrusion (62) includes a lower protrusion (621) for connecting to the lower inner tube (7). The lower protrusion (621) provides a lower boss (622) with a radial dimension larger on the front side. The water outlet end of the lower inner tube (7) is coupled and connected to the second end of the water connector (6) through the second intermediate fastener (33). The second intermediate fastener (33) is fixed to the lower boss (622).

6. The retractable water-passing structure with a curved pipe according to claim 5, characterized in that: The outer edge of the upper boss (612) is provided with a connecting structure, such as a thread or a bayonet provided on the outer edge of the upper boss (612). A radially enlarged upper flange (613) is provided on the rear side of the upper boss (612), and the front end face of the upper flange (613) is engaged with the lower end face of the upper outer tube, for example.

7. The retractable water-passing structure with a curved pipe according to claim 6, characterized in that: The radial dimension of the upper flange (613) is greater than the radial dimension of the upper outer tube.

8. A retractable hardware accessory, used as a shower rod for a bathroom faucet or as a water outlet pipe for a kitchen faucet; characterized in that: The retractable hardware fittings include a bendable retractable water passage structure according to any one of claims 1 to 7, and an upper outer tube (1) sleeved outside the upper inner tube (2). The internal configuration of the upper outer tube (1) is consistent with the external configuration of the upper inner tube (2), including a bent outer tube part (1A) and a straight outer tube part (1B) connected to each other. The straight outer tube (1B) is fixedly connected to the water connector (6); a sleeve (10) serves as a limiting structure with friction fit on the outside of the straight outer tube (1B); the sleeve (10) is fixed in the circumferential direction to the outer sleeve (121) of the mounting sleeve (12), the mounting sleeve (12) also includes a connecting rod (122) extending laterally from the outer sleeve (121), the connecting rod (122) is fixed to the mounting base (11); the sleeve (10) is smaller in length than the outer sleeve (121), the lower part (1211) of the outer sleeve (121) of the mounting sleeve (12) is provided with a fitting structure, which fits together with the upper end (131) of the straight outer tube (13).

9. The retractable hardware accessory according to claim 8, characterized in that: The outlet connector (4) is fixed to the outlet end (24) of the upper inner pipe. The outlet connector (4) is fixed to the outlet end of the upper inner pipe by the outlet fastener (31). The outlet connector (4) has a radially enlarged end, which fits the end face of the outlet end of the upper outer pipe. The lower end (132) of the lower outer tube (13) is fixedly connected to the inlet connector (8). The inlet connector (8) includes a base part (81) and an upper extension part (82). The lower outer tube (13) and the lower inner tube (7) are respectively fixed at different height positions of the upper extension part (82). The base part (81) is fitted with an inlet nut (9). The base part (81) includes a base support. The diameter of the base support is larger than the upper opening of the inlet nut (9). The upper extension part (82) includes a conical part and a cylindrical part. The conical part is fixed to the lower outer tube (13). The cylindrical part is fixed to the lower inner tube (7) by an inlet fastener (34).

10. The retractable hardware accessory according to claim 8, characterized in that: The larger radial position of the lower part (1211) is matched with the lower outer tube, and the smaller radial position of the lower part (1211) is matched with the upper flange (613).

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