Assembly type pipe-in-pipe

Abstract

The utility model provides an assembly type pipe-in-pipe. Comprising a bent pipe body, a connecting column arranged at the lower end of the bent pipe body, a water outlet seat arranged at the upper end of the bent pipe body, an outer water cavity formed in the bent pipe body, an inner water pipe arranged between the connecting column and the water outlet seat and located in the outer water cavity, and a water inlet cavity formed in the connecting column and communicated with the inner water pipe. The first water outlet end is arranged on the water outlet base, the first water outlet cavity is formed in the water outlet base and communicates with the first water outlet end and an inner water pipe, the side water cavity is formed in the connecting column and communicates with an outer water cavity, and the second water outlet end is arranged on the water outlet base. The second water outlet cavity is formed in the water outlet base and communicated with the second water outlet end and the outer water cavity, a lower sealing ring is arranged between the connecting column and the bent pipe body, and an upper sealing ring is arranged between the water outlet base and the bent pipe body.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline technical field, concretely relates to an assembly type pipe in pipe. BACKGROUND

[0002] Pipe in pipe refers to a kind of multilayer nested pipeline design, commonly used in double water faucet, it is divided into inner tube and outer tube respectively to transport cold, hot water or different function water flow (such as filtered water or pure water etc.), inner tube and outer tube do not interfere with each other when conveying, can be used in the case of one pipe body to the faucet with two water demand, usually the shape of pipe in pipe is 7 character-shaped elbow pipe.

[0003] As Figure 1 As shown in the prior art, pipe in pipe includes elbow pipe body 1', the connecting column 2' of setting in the lower end of elbow pipe body 1', the water outlet seat 3' of setting in the upper end of elbow pipe body 1', the outer water cavity 4' of being opened in elbow pipe body 1', the inner water pipe 5' of being set between connecting column 2' and water outlet seat 3' and being located in outer water cavity 4', the water inlet cavity 6' of being opened in connecting column 2' and being communicated with inner water pipe 5', the first water outlet end 7' of being set in the water outlet seat 3' and being communicated with inner water pipe 5', the side water cavity 8' of being opened in the connecting column 1' and being communicated with outer water cavity 4', the second water outlet end 9' of being set in the water outlet seat 3' and being communicated with outer water cavity 4', and elbow pipe body 1' is split setting.

[0004] Pipe in pipe needs to be produced separately when producing, and the elbow pipe body, connecting column, water outlet seat and inner water pipe are assembled by welding, in the assembly process of pipe in pipe, the lower end of inner water pipe is welded and fixed on connecting column first, so that water inlet cavity is communicated with inner water pipe, then inner water pipe is bent to be the same as the shape of elbow pipe body, the upper end of inner water pipe is connected with water outlet seat, then split elbow pipe body is wrapped outside inner water pipe, and the connecting position of split elbow pipe body and connecting column, water outlet seat is welded, but the assembly process of the pipe in pipe is complex, needs to be spliced, aligned and welded for many times, and the assembly convenience after pipe in pipe production cannot be improved. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defects and deficiencies of prior art, and provides a kind of assembly type pipe in pipe.

[0006] The utility model discloses a kind of assembled pipe-in-pipe, including elbow body, the connecting column of being set to the lower end of elbow body, the water outlet seat of being set to the upper end of elbow body, outer water cavity being opened in elbow body, inner water pipe being set to between connecting column and water outlet seat and located in outer water cavity, water inlet cavity being opened in connecting column and being communicated with inner water pipe, first water outlet end being set to the water outlet seat, first water outlet cavity being opened in the water outlet seat and being communicated with first water outlet end and inner water pipe respectively, side water cavity being opened in the connecting column and being communicated with outer water cavity, second water outlet end being set to the water outlet seat, second water outlet cavity being opened in the water outlet seat and being communicated with second water outlet end and outer water cavity respectively, characterized in that: the connecting column and the lower end of the elbow body gap fit, the water outlet seat and the upper end of the elbow body gap fit, lower sealing ring is arranged between the connecting column and the elbow body, upper sealing ring is arranged between the water outlet seat and the elbow body, the lower end and the upper end of the inner water pipe are connected with connecting column and water outlet seat respectively by connecting joint, and the inner water pipe is flexible pipe.

[0007] Further improvement is that: the connecting column and water outlet seat are respectively provided with positioning clamping pieces between the lower end and the upper end of the elbow body.

[0008] Further improvement is that: the positioning clamping piece includes positioning clamping hole being opened in the lower end and the upper end of the elbow body respectively and being communicated with outer water cavity, and clamping convex is arranged on the side end face of the connecting column and the water outlet seat respectively and is clamped and connected with the positioning clamping hole.

[0009] Further improvement is that: the clamping convex is provided with elastic member between the side end face of the connecting column and the water outlet seat.

[0010] Further improvement is that: the side end face of the connecting column and the water outlet seat is respectively provided with mounting inner hole, and extrusion sheet is arranged in the mounting inner hole of the side end face of the connecting column and the water outlet seat, and the clamping convex is arranged on the extrusion sheet.

[0011] Further improvement is that: the connecting joint includes step groove being opened in the connecting column and the water outlet seat respectively, sealing ring being opened in the connecting column and the water outlet seat respectively and being located in step groove, embedding block being opened in the connecting column and the water outlet seat respectively and being located in step groove, first through groove being arranged on the embedding block, mounting column being arranged on the embedding block and being located in the first through groove, second through groove being opened in the mounting column, at least two vertical openings being vertically opened in the mounting column and being communicated with the second through groove, and lug being arranged on the mounting column, the end of the lug is inclined surface, the inner circumferential side of the embedding block is provided with avoiding groove, and the inner water pipe is located in step groove through the second through groove and the sealing ring.

[0012] The utility model discloses beneficial effect is: after the separate production of the bend pipe body, connecting column, water outlet seat, inner water pipe, first, the inner water pipe is from the outer water cavity and is inserted into the bend pipe body, then the lower end of inner water pipe is connected with connecting column through connecting joint, then the bend pipe body is inserted into the upper end of connecting column, and then the upper end of inner water pipe is connected with water outlet seat through connecting joint, and then water outlet seat is inserted into the upper end of bend pipe body from outer water cavity, at this time, the gap between bend pipe body and connecting column and water outlet seat is sealed through lower sealing washer and upper sealing washer, and the gap between bend pipe body and connecting column and water outlet seat is tensioned through the setting of sealing washer, and the assembly process can be completed only by splicing, and the assembly convenience after pipe-in-pipe production can be improved.

[0013] Further effect: the connecting column is provided with a sealing ring groove, the lower sealing ring is installed in the sealing ring groove, the water outlet seat is also provided with a sealing ring groove, the upper sealing ring is installed in the sealing ring groove, and the sealing ring groove can prevent the sealing ring from moving, falling off or deviating when the connecting column and the water outlet seat are inserted into the bend pipe body.

[0014] Further effect: the lower sealing ring and the upper sealing ring are used for sealing the gap between the bend pipe body and the connecting column and the water outlet seat, and the gap between the bend pipe body and the connecting column and the water outlet seat is tensioned through the setting of the sealing ring, so that the connecting column and the water outlet seat can be pulled and installed from the bend pipe body, and the sealing property between the bend pipe body and the connecting column and the water outlet seat is improved.

[0015] Further effect: the gap between the connecting column and the water outlet seat and the bend pipe body is matched, so that the lower end of the bend pipe body can rotate relative to the upper end of the connecting column, the position of water outlet can be changed according to customer demand, the water outlet seat can also rotate relative to the upper end of the bend pipe body, the water outlet angle of the water outlet seat is adjusted, and the gap is sealed through the setting of the lower sealing ring and the upper sealing ring, so that the phenomenon of water leakage is prevented.

[0016] Further effect: since the assembly mode in the application does not need to use welding, the connecting column and the water outlet seat and the water outlet pipe can be made of plastic to save cost, the three are assembled by clamping or glued, and if the appearance is improved, a metal sleeve or a metal plating layer can be arranged on the surface of the part.

[0017] Further effect: when the connecting column and the water outlet base are inserted into the elbow body, the snap protrusions are pushed into the elbow body and adhere to the inner wall by secondary force, the connecting column and the water outlet base are continuously pushed until they completely adhere to the elbow body, then the connecting column and the water outlet base are twisted, the snap protrusions are clamped in the positioning clamping holes, thereby realizing the positioning and slight clamping effect, if the connecting column and the water outlet base need to be rotated, two hands hold the elbow body and the connecting column or the water outlet base and twist in the opposite direction until the snap protrusions are separated from the positioning clamping holes.

[0018] Further effect: when the connecting column and the water outlet base are inserted into the elbow body, the snap protrusions are pushed into the elbow body and adhere to the inner wall by secondary force, the connecting column and the water outlet base are continuously pushed until they completely adhere to the elbow body, then the connecting column and the water outlet base are twisted, the snap protrusions are clamped in the positioning clamping holes, thereby realizing the positioning and slight clamping effect, if the connecting column and the water outlet base need to be rotated, two hands hold the elbow body and the connecting column or the water outlet base and twist in the opposite direction until the snap protrusions are separated from the positioning clamping holes.

[0019] Further effect: when the connecting column and the water outlet base are inserted into the elbow body, the snap protrusions are pushed into the elbow body and adhere to the inner wall by secondary force, the connecting column and the water outlet base are continuously pushed until they completely adhere to the elbow body, then the connecting column and the water outlet base are twisted, the snap protrusions are clamped in the positioning clamping holes, thereby realizing the positioning and slight clamping effect, if the connecting column and the water outlet base need to be rotated, two hands hold the elbow body and the connecting column or the water outlet base and twist in the opposite direction until the snap protrusions are separated from the positioning clamping holes. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Figure 1 is a structure diagram of pipe-in-pipe in the prior art;

[0022] Figure 2 is a structure diagram of the utility model;

[0023] Figure 3 is a front view cutaway view of the bend pipe body, connecting column, water outlet seat, inner water pipe, second water outlet cavity, lower sealing ring, upper sealing ring and side water cavity in the utility model;

[0024] Figure 4 is a structure diagram of the connecting column, water inlet cavity, engaging protrusion and side water cavity in the utility model;

[0025] Figure 5 is a structure diagram of the water outlet seat, first water outlet end, second water outlet end, second water outlet cavity and engaging protrusion in the utility model;

[0026] Figure 6 is a side view cutaway view of the bend pipe body and inner water pipe in the utility model;

[0027] Figure 7 is a cutaway view of the connecting column, water inlet cavity, engaging protrusion, mounting inner hole and extrusion piece in the utility model;

[0028] Figure 8 is a cutaway view of the water outlet seat, first water outlet end, first water outlet cavity, second water outlet end and step groove in the utility model;

[0029] Figure 9 is a cutaway view of the connecting column and connecting joint in the utility model;

[0030] Figure 10 is a structure diagram of the connecting structure in the utility model.

[0031] BRIEF DESCRIPTION OF REFERENCE NUMERALS: bend pipe body 1, connecting column 2, water outlet seat 3, outer water cavity 4, inner water pipe 5, water inlet cavity 6, first water outlet end 7, first water outlet cavity 8, second water outlet end 9, second water outlet cavity 10, lower sealing ring 11, upper sealing ring 12, connecting joint 13, positioning clamping hole 14, engaging protrusion 15, mounting inner hole 16, extrusion piece 17, step groove 131, sealing ring 132, embedded block 133, first through groove 134, mounting column 135, second through groove 136, vertical opening 137, protruding block 138, avoiding groove 139, side water cavity 18. DETAILED DESCRIPTION

[0032] The utility model will be further described in combination with the drawings and specific embodiments.

[0033] Referring to Figures 2 to 10As shown, the technical scheme adopted in the present embodiment is: 1. A fabricated pipe-in-pipe, comprising a bent pipe body 1, a connecting column 2 arranged at the lower end of the bent pipe body 1, a water outlet seat 3 arranged at the upper end of the bent pipe body 1, an outer water cavity 4 opened on the bent pipe body 1, an inner water pipe 5 arranged between the connecting column 2 and the water outlet seat 3 and located in the outer water cavity 4, a water inlet cavity 6 opened on the connecting column 2 and communicating with the inner water pipe 5, a first water outlet end 7 arranged on the water outlet seat 3, a first water outlet cavity 8 opened on the water outlet seat 3 and communicating with the first water outlet end 7 and the inner water pipe 5 respectively, a side water cavity 18 opened on the connecting column 2 and communicating with the outer water cavity 4, a second water outlet end 9 arranged on the water outlet seat 3, a second water outlet cavity 10 opened on the water outlet seat 3 and communicating with the second water outlet end 9 and the outer water cavity 4 respectively, the connecting column 2 is in clearance fit with the lower end of the bent pipe body 1, the water outlet seat 3 is in clearance fit with the upper end of the bent pipe body 1, a lower sealing ring 11 is arranged between the connecting column 2 and the bent pipe body 1, an upper sealing ring 12 is arranged between the water outlet seat 3 and the bent pipe body 1, the lower end and the upper end of the inner water pipe 5 are connected with the connecting column 2 and the water outlet seat 3 respectively through a connecting joint 13, and the inner water pipe 5 is a hose.

[0034] The number of upper sealing ring 12 and lower sealing ring 11 can be one or two or more than two, which can be selected and arranged according to the use condition. The more sealing rings, the better the sealing effect and the greater the tension. The upper sealing ring 12 and the lower sealing ring 11 are elastic sealing rings. The hose of the inner water pipe 5 can be made of PVC, vinyl, silica gel, polyurethane and other materials. The material of the hose is not limited here, as long as it is soft and can transport water flow without affecting normal use. The lower end of the connecting column 2 is inserted into the water outlet end of the faucet. The pipe-in-pipe in the present application has the same use scene as the pipe-in-pipe in the prior art, which will not be described in detail here. The bent pipe body 1 can be a 7-shaped bent pipe or a U-shaped bent pipe. Figure 1 、 Figure 2 、 Figure 7 The first water outlet end and the second water outlet end can be arranged as the water outlet position of the traditional bubbler, so that the first water outlet end and the second water outlet end outlet water from the end of the bent pipe.

[0035] The outlet end is in the form of a traditional water outlet nozzle or water outlet hole. The outlet end only needs to be able to complete the water outlet. When the length of the inner water pipe 5 is set longer, it can also play a similar effect of pulling the faucet. By detaching the water outlet seat 3 from the bent pipe body 1, the inner water pipe 5 is kept connected with the water outlet seat 3, so as to pull the water outlet seat 3 to move.

[0036] The connecting column 2 and the water outlet seat 3 are respectively provided with positioning clamps between the lower end and the upper end of the bent pipe body 1.

[0037] The positioning clamping piece comprises positioning clamping holes 14 respectively arranged at the lower end and the upper end of the elbow pipe body 1 and communicated with the outer water cavity 4, and clamping protrusions 15 respectively arranged at the side end faces of the connecting column 2 and the water outlet seat 3 and clamped and connected with the positioning clamping holes 14.

[0038] In the case that the extrusion piece 17 is not arranged, the clamping protrusion 15 can be arranged as a rubber protrusion, or the arrangement thickness of the clamping protrusion 15 is reduced, and the clamping protrusion 15 is clamped into the elbow pipe body 1 by means of hard extrusion, the arrangement thickness is just enough to slightly clamp the connecting seat and the water outlet seat 3 on the elbow pipe body 1, and when the connecting seat and the water outlet seat 3 are gripped by hands and twisted, the clamping protrusion 15 can be separated from the positioning clamping hole 14.

[0039] The clamping protrusion 15 is arranged with an elastic piece between the side end faces of the connecting column 2 and the water outlet seat 3.

[0040] The side end faces of the connecting column 2 and the water outlet seat 3 are respectively arranged with mounting inner holes 16, the side end faces of the connecting column 2 and the water outlet seat 3 are arranged with extrusion pieces 17 in the mounting inner holes 16, and the clamping protrusions 15 are arranged on the extrusion pieces 17. The extrusion piece 17 is a nylon piece or a plastic piece. A space is formed between the extrusion piece 17 and the side end faces of the connecting column 2 and the water outlet seat 3, and the extrusion piece 17 is deformed to the mounting inner hole 16. In this scheme, the positioning clamping hole 14 is a perforated structure, and if the extrusion piece 17 is not arranged, the perforated structure is not needed.

[0041] The elastic piece can also be a piece-shaped arch-shaped protrusion, the two ends of the piece-shaped arch-shaped protrusion are arranged at the side end faces of the connecting column 2 and the water outlet seat 3, a space is formed in the middle of the piece-shaped arch-shaped protrusion, the clamping protrusion 15 is arranged at the middle position, and when the clamping protrusion 15 is extruded, the extrusion piece 17 is deformed to the middle position.

[0042] The connecting joint 13 comprises stepped grooves 131 respectively arranged on the connecting column 2 and the water outlet seat 3, sealing rings 132 respectively arranged on the connecting column 2 and the water outlet seat 3 and located in the stepped grooves 131, embedded blocks 133 respectively arranged on the connecting column 2 and the water outlet seat 3 and located in the stepped grooves 131, first through grooves 134 arranged on the embedded blocks 133, mounting columns 135 arranged on the embedded blocks 133 and located in the first through grooves 134, second through grooves 136 arranged on the mounting columns 135, at least two vertical openings 137 vertically arranged on the mounting columns 135 and communicated with the second through grooves 136, and protrusions 138 arranged on the mounting columns 135, the end of the protrusion 138 is an inclined face, the inner circumferential side of the embedded block 133 is arranged with an avoiding groove 139, and the inner water pipe 5 passes through the second through groove 136 and the sealing ring 132 and is located in the stepped groove 131.

[0043] The step groove 131 is divided into a small groove and a large groove, the diameter of the small groove is smaller than that of the large groove, the sealing ring 132 is a silica gel ring or a rubber ring, the sealing ring 132 is arranged in the small groove during installation, and the fitting block 133 is arranged in the large groove and is clamped in the large groove by the clamping teeth arranged on the periphery.

[0044] The working principle of the utility model is: after the bent pipe body 1, the connecting column 2, the water outlet seat 3 and the inner water pipe 5 are produced separately, the inner water pipe 5 is inserted into the bent pipe body 1 from the outer water cavity 4, then the lower end of the inner water pipe 5 is connected with the connecting column 2 through the connecting joint 13, then the bent pipe body 1 is inserted into the upper end of the connecting column 2, then the upper end of the inner water pipe 5 is connected with the water outlet seat 3 through the connecting joint 13, then the water outlet seat 3 is inserted into the upper end of the bent pipe body 1 from the outer water cavity 4 (the lower end of the inner water pipe 5 can be connected with the connecting column 2 first, then the inner water pipe 5 is pulled and inserted into the outer water cavity 4 from the bent pipe body 1, then the upper end of the inner water pipe 5 is connected with the water outlet seat 3), at this time, the gap between the bent pipe body 1 and the connecting column 2 and the water outlet seat 3 is sealed by the lower sealing ring 11 and the upper sealing ring 12, and the bent pipe body 1 is tensioned with the connecting column 2 and the water outlet seat 3 by the sealing ring, the assembly process can be completed only by splicing, and the assembly convenience after pipe-in-pipe production can be improved.

[0045] The connecting column 2 is provided with a sealing ring groove, the lower sealing ring 11 is arranged in the sealing ring groove, the water outlet seat 3 is also provided with a sealing ring groove, and the upper sealing ring 12 is arranged in the sealing ring groove, so that the sealing ring can be prevented from moving, falling off or deviating when the connecting column 2 and the water outlet seat 3 are inserted into the bent pipe body 1.

[0046] The lower sealing ring 11 and the upper sealing ring 12 are used for sealing the gap between the bent pipe body 1 and the connecting column 2 and the water outlet seat 3, and tensioning the bent pipe body 1 with the connecting column 2 and the water outlet seat 3 by the sealing ring, so that the connecting column 2 and the water outlet seat 3 can be pulled and installed from the bent pipe body 1, and the sealing property between the bent pipe body 1 and the connecting column 2 and the water outlet seat 3 is improved.

[0047] The gap between the connecting column 2 and the water outlet seat 3 and the bent pipe body 1 is matched, so that the lower end of the bent pipe body 1 can rotate relative to the upper end of the connecting column 2, the position of water outlet can be changed according to the customer's demand, the water outlet seat 3 can also rotate relative to the upper end of the bent pipe body 1, so that the water outlet angle of the water outlet seat 3 is adjusted (since the inner water pipe 5 is a flexible pipe, the rotation of the water outlet seat 3 is not limited), and the gap is sealed by the lower sealing ring 11 and the upper sealing ring 12, so that the phenomenon of water leakage is prevented even in the rotating process of the water outlet seat 3 and the bent pipe body 1.

[0048] Since the assembling mode in the application does not need to use welding, the connecting column 2 and the water outlet seat 3 and the water outlet pipe can be set as plastic parts in order to save cost, and the three are assembled by clamping or glued, and if the metal sleeve or the metal plating layer is set on the surface of the parts in order to improve the appearance.

[0049] When the connecting column 2 and the water outlet seat 3 are inserted into the elbow body 1, the clamping protrusion 15 enters the elbow body 1 and is attached to the inner wall by pushing the connecting column 2 and the water outlet seat 3 by secondary force, and the connecting column 2 and the water outlet seat 3 are continuously pushed until they are completely attached to the elbow body 1, and then the connecting column 2 and the water outlet seat 3 are twisted, so that the clamping protrusion 15 is clamped in the positioning clamping hole 14, thereby realizing the positioning and slight clamping effect, and if the connecting column 2 and the water outlet seat 3 need to be rotated, then the elbow body 1 and the connecting column 2 or the water outlet seat 3 are held by force with both hands and twisted in the opposite direction until the clamping protrusion 15 is separated from the positioning clamping hole 14.

[0050] When the connecting column 2 and the water outlet seat 3 are pushed by force, the clamping protrusion 15 is extruded with the inner wall of the elbow body 1, so that the extrusion piece 17 is slightly deformed in the direction of the mounting inner hole 16, and when the clamping protrusion 15 corresponds to the positioning clamping hole 14, the extrusion piece 17 resets to drive the clamping protrusion 15 to be clamped with the positioning clamping hole 14, which can reduce the friction and extrusion force generated by the extrusion of the clamping protrusion 15 with the inner wall of the elbow body 1, and improve the service life of the elbow body 1 and the clamping protrusion 15; when the positioning clamping hole 14 and the clamping protrusion 15 need to be disengaged, a tool is inserted into the positioning clamping hole 14 to press the clamping protrusion 15 to drive the extrusion piece 17 to deform in the direction of the mounting inner hole 16, so that the positioning clamping hole 14 is disengaged from the clamping cooperation with the clamping protrusion 15, and then the connecting seat or the water outlet seat 3 can be twisted or pulled.

[0051] In the installation, first install the sealing ring 132 in the small groove, then put the embedded block 133 into the large groove to be extruded and fixed, pass the inner water pipe 5 from the position of the second through groove 136 through the installation column 135, then push the embedded block 133 from the position of the first through groove 134 through the inclined surface of the end of the protrusion 138, deform the protrusion 138 inward through the inclined surface and the application of the pushing force, continuously push the installation column 135 until the protrusion 138 is extruded with the inner wall of the sealing ring 132, and when extruding, the protrusion 138 and the installation column 135 are clamped inward through the inner water pipe 5 by the setting of the vertical opening 137, and the installation column 135 is clamped in the step groove 131 by the setting of the embedded block 133; when the inner water pipe 5 needs to be taken out, the inner water pipe 5 is pulled out from the embedded block 133 by pulling the installation column 135 outward, so as to realize the disassembly of the inner water pipe 5, through the setting, the connection of the inner water pipe 5 can be realized only by the clamping mode when assembling the pipe-in-pipe, without welding treatment, and the inner water pipe 5 after clamping is connected with the water inlet cavity 6, compared with the welding which needs to align the water inlet cavity 6, the installation and connection of the inner water pipe 5 can be facilitated.

[0052] The utility model wants to protect is the structure of product, the model of each element is not the content of the utility model protection, also is the known art, the element on the market can be as a kind of assembled pipe-in-pipe selection application as long as it can realize the function described above of the utility model. Therefore, the model of element and other parameters are not described in detail in the utility model. The contribution of the utility model lies in the scientific combination of each element.

[0053] The basic principle and main features of the utility model and its advantages are shown and described above, and those skilled in the art should understand that the utility model is not limited to the above examples, and the above examples and descriptions are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can also have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents. The utility model not described in detail is the known technology of those skilled in the art.

Claims

1. A prefabricated pipe-in-pipe system, comprising a bent pipe body, a connecting post disposed at the lower end of the bent pipe body, a water outlet seat disposed at the upper end of the bent pipe body, an outer water cavity opened on the bent pipe body, an inner water pipe disposed between the connecting post and the water outlet seat and located within the outer water cavity, a water inlet cavity opened on the connecting post and communicating with the inner water pipe, a first water outlet end disposed on the water outlet seat, a first water outlet cavity opened on the water outlet seat and communicating with the first water outlet end and the inner water pipe respectively, a side water cavity opened on the connecting post and communicating with the outer water cavity, a second water outlet end disposed on the water outlet seat, and a second water outlet cavity opened on the water outlet seat and communicating with the second water outlet end and the outer water cavity respectively, characterized in that: The connecting column is clearance-fitted with the lower end of the bend body, the water outlet seat is clearance-fitted with the upper end of the bend body, a lower sealing ring is provided between the connecting column and the bend body, and an upper sealing ring is provided between the water outlet seat and the bend body. The lower and upper ends of the inner water pipe are connected to the connecting column and the water outlet seat respectively through connecting joints. The inner water pipe is a flexible hose.

2. The assembled tube-in-tube according to claim 1, characterized in that: Positioning clips are respectively provided between the connecting column and the water outlet seat and the lower and upper ends of the bend body.

3. The assembled tube-in-tube according to claim 2, characterized in that: The positioning clip includes positioning holes respectively opened at the lower and upper ends of the bend body and connected to the outer water cavity, and engaging protrusions respectively set on the side end faces of the connecting column and the water outlet seat and engaged with the positioning holes.

4. The assembled tube-in-tube according to claim 3, characterized in that: An elastic element is provided between the engaging protrusion and the side end face of the connecting post and the water outlet seat.

5. The assembled tube-in-tube according to claim 4, characterized in that: The elastic element includes: the side end faces of the connecting column and the water outlet seat are respectively provided with mounting inner holes, the side end faces of the connecting column and the water outlet seat are provided with extrusion plates located in the mounting inner holes, and the engaging protrusion is provided on the extrusion plates.

6. The assembled tube-in-tube according to claim 1, characterized in that: The connecting joint includes stepped grooves respectively opened on the connecting post and the water outlet seat, sealing rings respectively opened on the connecting post and the water outlet seat and located in the stepped grooves, fitting blocks respectively opened on the connecting post and the water outlet seat and located in the stepped grooves, a first through groove provided on the fitting block, a mounting post provided on the fitting block and located in the first through groove, a second through groove opened on the mounting post, at least two vertical openings vertically opened on the mounting post and connected to the second through groove, and a protrusion provided on the mounting post. The end of the protrusion is an inclined surface. An avoidance groove is opened on the inner circumference of the fitting block. The inner water pipe passes through the second through groove and the sealing ring and is located in the stepped groove.

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