Pipe-in-pipe structure

Abstract

The utility model discloses a pipe-in-pipe structure which comprises an inner pipe and an outer pipe, the outer pipe is arranged on the periphery of the inner pipe in a sleeved mode, a water passing channel is arranged between the periphery of the inner pipe and the inner periphery of the outer pipe, the pipe-in-pipe structure further comprises a connector, the two ends of the inner pipe and the two ends of the outer pipe are inserted into the connector, and a first step face is arranged in the connector. The end face of the inner pipe can be matched with the first step face in an abutting mode, a second step face is further arranged in the connector, the end face of the outer pipe can be matched with the second step face in an abutting mode, the size of a product can be effectively reduced, and the shower rod connector can be well applied to a shower rod.

Description

Technical Field

[0001] The utility model relates to a pipe-in-pipe structure, which is particularly applicable to the design of shower products with a shower column. Background Art

[0002] The water circuit of an American top-inlet shower column requires: a switching valve led from above to below, and then a path is switched from the switching valve to the overhead shower. Currently, two structures can be used on the market. One is that two pipes are arranged side by side in the shower pipe as drainage pipes, so the size of the shower pipe needs to be enlarged to accommodate the two pipes. The other is that a coaxial pipe is connected in the shower pipe as the drainage pipe, so there are certain requirements for the water-passing material of the outer shower pipe, and there is also a risk of scalding people. At the same time, when applied, the switching valve is connected by nuts and connectors, and this method has a high cost. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a pipe-in-pipe structure.

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

[0005] A pipe-in-pipe structure includes an inner pipe and an outer pipe. The outer pipe is sleeved on the outer periphery of the inner pipe. A water-passing channel is arranged between the outer periphery of the inner pipe and the inner periphery of the outer pipe. The structure also includes a connector. Both ends of the inner pipe and the outer pipe are inserted into the connector. The connector is provided with a first step surface, and the end surface of the inner pipe can be in abutting cooperation with the first step surface. The connector is also provided with a second step surface, and the end surface of the outer pipe can be in abutting cooperation with the second step surface.

[0006] In an embodiment of the utility model, a third step surface is further arranged between the first step surface and the second step surface. An inlet hole for communicating the inside and outside of the connector is arranged at the third step surface, and the inlet hole can be communicated with the water-passing channel.

[0007] In an embodiment of the utility model, annular grooves are arranged on the outer periphery of the connector at both axial ends of the third step surface, and sealing rings can be arranged in the annular grooves.

[0008] In an embodiment of the utility model, the major diameter of the first step surface is smaller than the minor diameter of the second step surface. A first inner peripheral wall is formed in the connector between the first step surface and the third step surface, and the first inner peripheral wall can be hermetically connected with the outer peripheral wall of the inner pipe. A second inner peripheral wall is formed in the connector between the second step surface and the third step surface, and the second inner peripheral wall can be hermetically connected with the outer peripheral wall of the outer pipe.

[0009] In an embodiment of the utility model, the minor diameter of the first step surface is not greater than the minor diameter of the inner pipe.

[0010] In the embodiment of the present utility model, the minor diameter of the third step surface is not less than the minor diameter of the outer pipe.

[0011] A pipe-in-pipe structure of the present utility model has the following beneficial effects: After the pipe-in-pipe is sleeved on the shower pipe, its diameter can be made smaller, which can not only reduce costs, but also beautify the appearance. Since the outer pipe does not need to pass water, the risk of scalding can be eliminated. At the same time, during the use of the pipe-in-pipe, the material selection of the outer pipe is more extensive, there is no need to transfer the water flow direction, and the connection is more convenient; the shower outer pipe does not need to be welded, which can also reduce costs; the pipe-in-pipe assembly is directly connected to the switching valve through the outer pipe without nuts and threaded joints, which can also reduce costs. Brief Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a partial exploded view of the present utility model.

[0014] Figure 2 It is a cross-sectional view of the present utility model.

[0015] Figure 3 It is a partial cross-sectional view of the present utility model.

[0016] Figure 4 It is a schematic diagram of the joint in the present utility model. Detailed Embodiments

[0017] To make the purpose, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

[0018] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0019] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0020] In the present utility model, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0022] Referring to the accompanying drawings of the specification, a tube-in-tube structure includes an inner tube 10 and an outer tube 20. The outer tube is sleeved on the outer periphery of the inner tube. A water passage 30 is provided between the outer periphery of the inner tube and the inner periphery of the outer tube. It further includes a joint 40. Both ends of the inner tube and the outer tube are inserted into the joint. A first stepped surface 41 is provided in the joint, and the end surface of the inner tube can be in abutting cooperation with the first stepped surface. A second stepped surface 42 is also provided in the joint, and the end surface of the outer tube can be in abutting cooperation with the second stepped surface. The sizes of these two stepped surfaces are different and are staggeredly distributed.

[0023] Preferably, a third stepped surface 43 is further provided between the first stepped surface and the second stepped surface. An inlet hole 44 that can communicate the inside and outside of the joint is provided at the third stepped surface, and the inlet hole can be connected to the water passage. Annular grooves 45 are provided on the outer periphery of the joint at both axial ends of the third stepped surface. Sealing rings can be arranged in the annular grooves, which can ensure that the two water paths will not be mixed and also ensure the sealing performance of the overall structure.

[0024] Furthermore, the major diameter of the first stepped surface is smaller than the minor diameter of the second stepped surface. A first inner peripheral wall 46 is formed in the joint between the first stepped surface and the third stepped surface, and the first inner peripheral wall can be hermetically connected to the outer peripheral wall of the inner tube. A second inner peripheral wall 47 is formed in the joint between the second stepped surface and the third stepped surface, and the second inner peripheral wall can be hermetically connected to the outer peripheral wall of the outer tube.

[0025] Still further, the minor diameter of the first stepped surface is not greater than the minor diameter of the inner tube. The minor diameter of the first stepped surface can be equal to the minor diameter of the inner tube to allow the water flow to pass straight through. The minor diameter of the third stepped surface is not less than the minor diameter of the outer tube. It can be that the minor diameter of the third stepped surface is greater than the minor diameter of the outer tube.

[0026] The utility model can make the water inlet and outlet pass through the tube assembly inside the tube-in-tube. After applying the product, the outer rod does not contact water. Moreover, the inner tube can be installed as a component into the shower tube, and is fixedly connected to the switching valve and the upper water inlet through the outer tube, enabling the shower tube to have the functions of anti-scalding, no contact between water and hardware fittings, and low price. Through the joint with high and low steps staggered from each other, it is first hermetically connected to the inner tube and then to the outer tube. The joints at the other end also adopt the same connection method to form a tube-in-tube water path with joints at both ends. At the same time, the outer periphery of the inner tube and the outer tube and between the two inner peripheral walls are connected by laser welding. The inner tube and the outer tube can adopt PERT tubes.

[0027] The foregoing description illustrates and describes preferred embodiments of the present utility model. As previously mentioned, it should be understood that the present utility model is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. Any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A tube-in-tube structure, comprising an inner tube and an outer tube, the outer tube being sleeved on the outer periphery of the inner tube, and a water passage being provided between the outer periphery of the inner tube and the inner periphery of the outer tube, characterized in that, It further includes connectors. Both ends of the inner tube and the outer tube are inserted into the connectors. A first stepped surface is provided in the connectors. The end surface of the inner tube can be in abutting cooperation with the first stepped surface. A second stepped surface is also provided in the connectors. The end surface of the outer tube can be in abutting cooperation with the second stepped surface.

2. The pipe-in-pipe structure according to claim 1, wherein, A third stepped surface is further provided between the first stepped surface and the second stepped surface. A water inlet hole communicating the inside and outside of the connector is provided at the third stepped surface. The water inlet hole can be communicated with the water passing channel.

3. A tube-in-tube structure according to claim 2, characterized in that, Annular grooves are provided on the outer periphery of the connectors at the axial two ends of the third stepped surface. Sealing rings can be arranged in the annular grooves.

4. A pipe-in-pipe structure according to any one of claims 2-3, characterized in that, The major diameter of the first stepped surface is smaller than the minor diameter of the second stepped surface. A first inner peripheral wall is formed in the connector between the first stepped surface and the third stepped surface. The first inner peripheral wall can be hermetically connected to the outer peripheral wall of the inner tube. A second inner peripheral wall is formed in the connector between the second stepped surface and the third stepped surface. The second inner peripheral wall can be hermetically connected to the outer peripheral wall of the outer tube.

5. A tube-in-tube structure according to claim 4, characterized in that, The minor diameter of the first stepped surface is not greater than the minor diameter of the inner tube.

6. The pipe-in-pipe structure according to claim 5, characterized in that, The minor diameter of the third stepped surface is not less than the minor diameter of the outer tube.

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