Pipe-in-pipe joint fixing device

Abstract

The present invention discloses a pipe joint fixing device in a pipe, comprising an inner pipe and an outer pipe sleeved outside the inner pipe, wherein the inner pipe forms an inner passage, and the inner pipe and the outer pipe form an outer passage; further comprising a fixing mechanism and a connecting sleeve mounted on the outer pipe; the fixing mechanism comprises an inner pipe joint unit, an outer pipe joint and a locking mechanism; the inner pipe joint unit is fixedly mounted on the inner pipe port and the inner pipe joint unit is connected to the inner passage; the outer pipe joint is fixedly mounted on the outer pipe port, and the inner pipe joint unit and the outer pipe joint are fixedly mounted together through the locking mechanism; the fixing mechanism is also provided with a connecting path, and the connecting path connects the cavity between the connecting sleeve and the fixing mechanism and the outer passage. It has the following advantages: the outer pipe joint and the inner pipe joint unit are locked and fixed together through the locking structure to form a whole, the inner pipe and the outer pipe will not move relatively, they cooperate with external mounting or parts such as a shower as a whole, and there is no need to disassemble the outer pipe joint and the inner pipe joint unit during assembly, so it is convenient to assemble and disassemble, and has good sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen and bathroom, and in particular to a pipe joint fixing device in a pipe. Background Art

[0002] The pipe-in-pipe joint fixing device comprises an inner pipe and an outer pipe sleeved outside the inner pipe, wherein the inner pipe forms an inner passage, and the inner pipe and the outer pipe form an outer passage. Existing fixing devices, such as: CN104295816B, a water inlet pipe, comprises a mother pipe and a sub-pipe sleeved inside the mother pipe, wherein the inner cavity of the sub-pipe forms a first passage for conveying a first liquid, and a second passage for conveying a second liquid is formed between the sub-pipe and the mother pipe, wherein a connecting sleeve is sleeved around the outer periphery of the end of the mother pipe, wherein a valve core is provided in the connecting sleeve at the front end of the mother pipe, wherein a middle hole is provided in the middle of the valve core, wherein the sub-pipe passes through the middle hole of the valve core and is sealed with the valve core, and a water outlet connected to the second passage is provided around the valve core. Or, such as: CN205013928U, a tube-in-tube quick-connect structure, comprising an inner tube fixing ring and an outer tube connecting ring, the inner tube fixing ring firmly fixes the inner tube and the joint, the inner tube is arranged in the outer tube, and a joint connected to the water inlet or water outlet is inserted at the end of the outer tube, the outer tube connecting ring is sleeved on the outer peripheral wall of the joint and connected to the water inlet or water outlet, a positioning convex portion is arranged on the outer peripheral side of the outer tube connecting ring, and fixing convex pins are symmetrically arranged on the outer peripheral side of the outer tube connecting ring on both sides of the positioning convex portion, a positioning guide groove matching with the positioning convex portion is arranged on the water inlet or water outlet, a positioning fixing hole matching with the fixing convex pin is arranged on the water inlet or water outlet, a copper sealing sleeve is sleeved on the end of the outer tube, a sealing groove is arranged on the joint, and a sealing ring is arranged on the sealing groove. The above two existing technologies have the following shortcomings: first, the inner tube (sub-tube) is directly connected to the outside world (such as a water supply source or a water outlet terminal), which makes connection inconvenient; second, the inner tube and the outer tube are independently separated, and the inner tube can move relative to the outer tube with a large degree of freedom, which makes installation inconvenient; on the other hand, it needs to be disassembled when changing and washing, and may become loose over time, resulting in the risk of water leakage. Summary of the invention

[0003] The present invention provides a pipe-in-pipe joint fixing device, which overcomes the shortcomings of the pipe-in-pipe joint fixing device in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The invention discloses a pipe joint fixing device in a pipe, comprising an inner pipe and an outer pipe sleeved outside the inner pipe, wherein an inner passage is formed inside the inner pipe and an outer passage is formed between the inner pipe and the outer pipe; the invention also comprises a fixing mechanism and a connecting sleeve mounted on the outer pipe; the fixing mechanism comprises an inner pipe joint unit, an outer pipe joint and a locking mechanism; the inner pipe joint unit is fixedly mounted on the inner pipe port and the inner pipe joint unit is connected to the inner passage; the outer pipe joint is fixedly mounted on the outer pipe port, and the inner pipe joint unit and the outer pipe joint are fixedly mounted together by the locking mechanism; the fixing mechanism is also provided with a connecting passage, and the connecting passage connects the cavity between the connecting sleeve and the fixing mechanism and the outer passage.

[0006] In one embodiment: the inner tube joint unit includes an inner tube joint and an inner tube sleeve, one end of the inner tube joint is inserted into the inner tube port to achieve fixed installation, one end of the inner tube sleeve is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, and the other end of the inner tube sleeve is tightly sleeved on the outer peripheral wall of the inner tube end.

[0007] In one embodiment: the outer tube joint comprises a locking section and a connecting section, the locking section is inserted into the outer tube port and fixedly connected to the inner wall of the outer tube port, a positioning surface is provided between the connecting section and the locking section, and the positioning surface is closely connected to the end face of the outer tube.

[0008] In one embodiment: it also includes a first buckle, the outer peripheral wall of the outer pipe joint is recessed with an annular groove, the first buckle is sleeved in the annular groove of the outer pipe joint and has a protruding portion extending out of the outer pipe joint, and a limiting surface is provided in the connecting sleeve, and the protruding portion and the limiting surface cooperate.

[0009] In one embodiment: the inner tube joint unit includes an inner tube joint, one end of which is inserted into the inner tube port to achieve fixed installation, and the part of the inner tube joint extending out of the inner tube port is provided with a mating surface facing the inner tube; the locking mechanism includes a second buckle, which is sleeved on the outside of the inner tube joint and positioned between the end face of the outer tube joint and the mating surface.

[0010] In one embodiment, the second buckle includes a C-shaped buckle, and the C-shaped buckle has a notch, and the notch constitutes the above-mentioned connecting path or a part of the connecting path.

[0011] In one embodiment: the second buckle end surface is concavely provided with a groove penetrating inside and outside, and the groove constitutes the above-mentioned connecting path or part of the connecting path.

[0012] In one embodiment: the inner tube joint unit includes an inner tube seal, one end of the inner tube seal is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, the other end of the inner tube seal is tightly sleeved on the outer wall of the inner tube end, and the second buckle is surrounded by the outside of the inner tube seal.

[0013] In one embodiment: the inner tube joint unit includes an inner tube joint and an inner joint, one end of the inner tube joint is inserted into the inner tube port to achieve fixed installation, the inner joint is fixed at the other end of the inner tube joint and the inner tube joint is provided with a convex ring, the locking mechanism includes a locking sleeve, the inner joint is located in the outer tube joint port, the convex ring is pressed against the end surface of the outer tube joint and the locking sleeve is fixed outside the outer tube joint, and the locking sleeve and the end surface of the outer tube joint are locked to the convex ring by locking the locking sleeve and the outer tube joint.

[0014] In one embodiment, the connecting section is provided with a through hole penetrating inside and outside, and the through hole constitutes the above-mentioned connecting path.

[0015] In one embodiment, a flange is convexly provided inside the locking sleeve, and the flange and the end surface of the outer pipe joint are tightly locked to the convex ring by locking the locking sleeve and the outer pipe joint.

[0016] In one embodiment: the inner tube joint unit includes an inner tube seal, one end of the inner tube seal is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, the other end of the inner tube seal is tightly sleeved on the outer wall of the inner tube end, and the outer tube joint is surrounded by the inner tube seal.

[0017] Compared with the background technology, this technical solution has the following advantages:

[0018] The outer pipe joint and the inner pipe joint unit are locked and fixed together through a locking structure to form a whole. The inner pipe and the outer pipe will not move relative to each other. They cooperate with external parts such as the shower head as a whole. There is no need to disassemble the outer pipe joint and the inner pipe joint unit during assembly. The assembly is convenient and the sealing is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 2 is a cross-sectional schematic diagram of a fixing device according to the first embodiment.

[0021] Figure 2 It is a three-dimensional exploded schematic diagram of the fixing device of Example 1.

[0022] Figure 3 It is a structural schematic diagram of an application example of the fixing device of the first embodiment.

[0023] Figure 4 yes Figure 3 Schematic diagram of the local section at point A.

[0024] Figure 5 It is a cross-sectional schematic diagram of the fixing device of the second embodiment.

[0025] Figure 6 It is a three-dimensional exploded schematic diagram of the fixing device of the second embodiment.

[0026] Figure 7 It is a three-dimensional schematic diagram of the second buckle of the fixing device of the second embodiment.

[0027] Explanation of reference numerals: inner tube 1, outer tube 2, inner passage 11, outer passage 21; fixing mechanism 3, inner tube joint unit 31, outer tube joint 32, locking mechanism 33, connecting passage 34; inner tube joint 311, second convex ring 3111, inner joint 312, inner tube sleeve 313; locking section 321, connecting section 322, convex ring 3121, positioning surface 323, annular groove 324; locking sleeve 331, flange 332; connecting sleeve 4, cavity 41, limiting surface 42; first buckle 5.

[0028] The matching surface 3112 , the second buckle 333 , the notch 3331 , and the groove 3332 . DETAILED DESCRIPTION

[0029] Embodiment 1

[0030] For pipe-in-pipe joint fixing devices, please refer to Figure 1 and Figure 2 , including a tube-in-tube, the tube-in-tube including an inner tube 1 and an outer tube 2 sleeved outside the inner tube 1, the inner tube 1 forms an inner passage 11, the inner tube 1 and the outer tube 2 form an outer passage 21, and the inner passage 11 and the outer passage 21 are isolated from each other by the inner tube 1.

[0031] The pipe joint fixing device in the pipe also includes a fixing mechanism 3 and a connecting sleeve 4 mounted on the outer pipe 2. The fixing mechanism 3 includes an inner pipe joint unit 31, an outer pipe joint 32 and a locking mechanism 33; the inner pipe joint unit 31 is fixedly mounted on the port of the inner pipe 1 and is connected to the inner passage 11; the outer pipe joint 32 is fixedly mounted on the port of the outer pipe 2, and the inner pipe joint unit 31 and the outer pipe joint 32 are fixed together through the locking mechanism 33; the fixing mechanism 3 is also provided with a connecting passage 34, and the connecting passage 34 connects the cavity 41 between the connecting sleeve 4 and the fixing mechanism 3 and the outer passage 21.

[0032] The outer tube joint 32 comprises a locking section 321 and a connecting section 322; the locking section 321 is inserted into the port of the outer tube 2 and fixedly connected to the inner wall of the port of the outer tube 2, for example, the outer peripheral wall of the locking section 321 is provided with inverted teeth or threads or barbs or buckles, etc., and the fixing is achieved by the tight fit between these structures and the port of the outer tube 2, and a gap is left between the inner wall of the locking section 321 and the outer wall of the inner tube for water to flow through; the connecting section 322 is partially protruding relative to the locking section 321 to form a positioning surface 323 facing the outer tube between the locking section and the connecting section, and the positioning surface 323 is closely connected to the end face of the outer tube 2, so as to lock and fix the outer tube joint 32 and the outer tube 2. In addition, a sealing ring 325 is provided on the outer tube joint 32.

[0033] The inner tube joint unit 31 includes an inner tube joint 311 and an inner joint 312. One end of the inner tube joint 311 is inserted into the port of the inner tube 1 to achieve fixed installation, which is like the fixed installation structure of the outer tube joint and the outer tube; the inner joint 312 is fixed at the other end of the inner tube joint 311, and the fixed installation is like a threaded connection, so as to lock and fix the inner tube 1, the inner tube joint 311 and the inner joint 312, and the connection between the inner joint, the inner tube joint and the inner waterway. The inner joint 312 is located in the port of the outer tube joint 32, and the outer peripheral wall of the inner joint 312 is convexly provided with a convex ring 3121.

[0034] The locking mechanism 33 includes a locking sleeve 331, the peripheral edge of the end of the locking sleeve 331 extends inward to form an inwardly convex flange 332, the locking sleeve 331 is sleeved with the inner joint 312 and locked to the outer pipe joint 32, and the locking connection is such as a threaded connection; the convex ring 3121 is between the end surface of the outer pipe joint 32 and the flange 332, and the flange and the end surface of the outer pipe joint are locked with the convex ring by locking, so as to lock and fix the outer pipe joint 32, the inner pipe joint 311 and the inner joint 312, and the inner pipe and the outer pipe will not move, which is convenient for overall assembly and does not need to be disassembled when replaced. The connecting section 322 is provided with a through hole that penetrates inside and outside, and the through hole constitutes the above-mentioned connecting path 34. According to needs, the locking mechanism can be directly set between the outer pipe joint and the inner joint, such as a threaded connection or other locking connection.

[0035] The inner tube joint unit 31 includes an inner tube sleeve 313, one end of the inner tube sleeve 313 is tightly sleeved on the part of the inner tube joint 311 extending out of the inner tube 1 port, and the other end of the inner tube sleeve 313 is tightly sleeved on the outer wall of the end of the inner tube 1. The outer tube joint 311 is surrounded by the inner tube sleeve 313, and a gap is left between the outer tube joint 311 and the inner tube sleeve 313. The inner tube sleeve 313 further prevents water flowing to the outer passage from flowing into the inner passage, and prevents water flowing to the inner passage from flowing into the outer passage. The inner and outer waterways are independent of each other and do not affect each other.

[0036] As needed, the outer peripheral wall of the inner pipe joint 311 is also protruding with a second convex ring 3111, the inner joint 312 is locked to the outside of the inner pipe joint 311 and the end is against the first end face of the second convex ring 3111, and one end of the inner tube sleeve 313 is tightly sleeved on the part of the inner tube joint 311 extending outside the inner tube port and is axially positioned by the second end face of the second convex ring.

[0037] The pipe-in-pipe joint fixing device also includes a first buckle 5. The outer peripheral wall of the outer pipe joint 32 is concavely provided with an annular groove 324. The first buckle 5 is sleeved in the annular groove 324 of the outer pipe joint 32 and has a protruding portion extending out of the outer pipe joint. The connecting sleeve 4 is a trumpet-shaped sleeve structure and is provided with a limiting surface 42. The protruding portion and the limiting surface cooperate. The trumpet sleeve is provided with an internal thread that can be threadedly assembled to the outside. When the thread is connected, the first buckle is used to limit the position and achieve locking. The first buckle 5 is a C-shaped buckle.

[0038] In the pipe-in-pipe joint fixing device of this embodiment, the outer pipe joint 32, the inner pipe joint 311 and the inner joint 312 are locked and fixed together to form a whole. The inner pipe and the outer pipe can be used as a whole to be connected to the outside or cooperate with parts such as a shower head, which is convenient to assemble.

[0039] Figure 3 and Figure 4 : is a structural schematic diagram of an application example of the above-mentioned fixing device, the application example is a kitchen pull-out faucet, the pull-out faucet includes a faucet body 61, a main control mechanism 62 arranged on the faucet body 61 and a water pipe 65, the main control mechanism 62 is connected to a cold water pipe 63, a hot water pipe 64 and a mixing waterway to control the water temperature, flow rate and switch through the handle of the main control mechanism 62; the faucet body 61 is also connected to a clean water waterway; one end of the water pipe 65 is connected to the faucet body 61, and the other end passes through the faucet body 61 and is connected to a water outlet terminal 66, the water pipe 65 adopts the above-mentioned pipe-in-pipe structure; the connection between the water pipe 65 and the water outlet terminal 66 adopts the above-mentioned fixing device, and the connection between the water pipe 65 and the main control mechanism 62 adopts the above-mentioned fixing device; the inner passage 11 and the outer passage 21 of the pipe-in-pipe are connected to the clean water waterway and the mixing waterway respectively, or the inner passage 11 and the outer passage 21 are connected to the mixing waterway and the clean water waterway respectively. The water outlet terminal is provided with a switch capable of controlling the water channel of the water outlet terminal corresponding to the purified water channel.

[0040] Embodiment 2

[0041] The pipe-in-pipe joint fixing device is different from the first embodiment in that: Figure 5 , Figure 6 and Figure 7 The inner tube joint unit 31 includes an inner tube joint 311, one end of which is inserted into the port of the inner tube 1 to achieve fixed installation, and the part of the inner tube joint 311 extending out of the inner tube port is provided with a mating surface 3112 facing the inner tube 1; the locking mechanism 33 includes a second buckle 333, which is sleeved on the outside of the inner tube joint 311 and adapted to be positioned between the end face of the outer tube joint 32 and the mating surface 3112. The inner tube joint and the outer tube joint are limited by the second buckle 333 to prevent the relative movement of the two, and to prevent the relative movement of the outer tube and the inner tube, and the second buckle will not squeeze the inner tube and will not affect the flow. The second buckle 333 includes a C-shaped buckle, which has a notch 3331, and the end face of the second buckle 333 is concavely provided with a groove 3332 that penetrates inside and outside, and the notch 3331 and the groove 3332 constitute the above-mentioned connecting path 34. The mating surface 3112 also axially positions one end of the inner tube sleeve 313. The second buckle 333 not only prevents the outer tube and the inner tube from moving relative to each other, but also forms a water passage, thereby simplifying the structure and making it compact.

[0042] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A pipe-in-pipe joint fixing device, comprising an inner pipe and an outer pipe sleeved outside the inner pipe, wherein an inner passage is formed inside the inner pipe, and an outer passage is formed between the inner pipe and the outer pipe; characterized in that: It also includes a fixing mechanism and a connecting sleeve mounted on the outer tube; the fixing mechanism includes an inner tube joint unit, an outer tube joint and a locking mechanism; the inner tube joint unit is fixedly mounted on the inner tube port and the inner tube joint unit is connected to the inner passage; the outer tube joint is fixedly mounted on the outer tube port, and the inner tube joint unit and the outer tube joint are fixed together through the locking mechanism; the fixing mechanism is also provided with a connecting passage, which connects the cavity between the connecting sleeve and the fixing mechanism and the outer passage; the outer tube joint has a locking section and a connecting section, and the locking section is inserted into the outer tube port and fixedly connected to the outer tube port The inner tube joint unit comprises an inner tube joint and an inner joint, one end of the inner tube joint is inserted into the inner tube port to realize fixed installation, the inner joint is fixed at the other end of the inner tube joint and the inner tube joint is provided with a convex ring, the locking mechanism comprises a locking sleeve, the inner joint is located in the outer tube joint port, the convex ring is pressed against the end face of the outer tube joint and the locking sleeve is fixed outside the outer tube joint, and the locking sleeve and the end face of the outer tube joint are locked with the convex ring by locking the locking sleeve and the outer tube joint.

2. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: The inner tube joint unit comprises an inner tube joint and an inner tube sealing sleeve, wherein one end of the inner tube joint is inserted into the inner tube port for fixing, one end of the inner tube sealing sleeve is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, and the other end of the inner tube sealing sleeve is tightly sleeved on the outer peripheral wall of the inner tube end.

3. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: It also includes a first buckle, the outer peripheral wall of the outer pipe joint is recessed with an annular groove, the first buckle is sleeved in the annular groove of the outer pipe joint and has a protruding portion extending out of the outer pipe joint, a limiting surface is provided in the connecting sleeve, and the protruding portion cooperates with the limiting surface.

4. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: The inner tube joint unit comprises an inner tube joint, one end of which is inserted into the inner tube port for fixing, and the part of the inner tube joint extending out of the inner tube port is provided with a mating surface facing the inner tube; the locking mechanism comprises a second buckle, which is sleeved on the outside of the inner tube joint and positioned between the end face of the outer tube joint and the mating surface.

5. The pipe-in-pipe joint fixing device according to claim 4, characterized in that: The second buckle comprises a C-shaped buckle having a notch, and the notch constitutes the above-mentioned connecting path or a part of the connecting path.

6. The pipe-in-pipe joint fixing device according to claim 4, characterized in that: The second buckle end surface is concavely provided with a groove penetrating inside and outside, and the groove constitutes the above-mentioned connecting path or part of the connecting path.

7. The pipe-in-pipe joint fixing device according to claim 4, characterized in that: The inner tube joint unit comprises an inner tube seal, one end of which is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, the other end of which is tightly sleeved on the outer wall of the inner tube end, and the second buckle is surrounded outside the inner tube seal.

8. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: The connecting section is provided with a through hole which penetrates inside and outside, and the through hole constitutes the above-mentioned connecting path.

9. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: A flange is convexly arranged inside the locking sleeve, and the flange and the end surface of the outer pipe joint are tightly locked with the convex ring through the locking connection between the locking sleeve and the outer pipe joint.

10. The pipe-in-pipe joint fixing device according to claim 1, characterized in that: The inner tube joint unit comprises an inner tube seal, one end of which is tightly sleeved on the part of the inner tube joint extending outside the inner tube port, and the other end of which is tightly sleeved on the outer wall of the inner tube end, and the outer tube joint is surrounded by the inner tube seal.

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