Double buckle pipe connector and manufacturing method thereof

Abstract

The present invention discloses a double-buckle tube connector, comprising an inner tube, a metal double-buckle tube, and an inner and outer seals arranged at the ends of the inner tube. The metal double-buckle tube is sleeved on the outside of the inner tube, the inner seal is tightly fitted on the end of the inner tube, and the outer seal is tightly fitted on the outside of the metal double-buckle tube. The inner wall of the inner seal forms an annular protrusion outwardly, and the protrusion corresponds to the concave portion of the inner wall of the metal double-buckle tube. In the double-buckle tube connector using the above technical solution, after the protrusion enters the concave portion, the outer wall of the metal double-buckle tube is pressed outward against the inner wall of the outer seal, thereby forming a clamping structure to prevent the metal sleeve from falling off from the inner seal or the outer seal. In addition, an injection molded part is also provided inside the inner seal, and the outer wall of the injection molded part enters the groove formed inside the protrusion, which can strengthen the strength of the inner seal on the one hand, and strengthen the connection between the inner seal and the inner tube on the other hand, to prevent the inner tube from being pulled off. The present invention also provides a manufacturing method for the double-buckle tube connector.

Description

Technical Field

[0001] The invention relates to bathroom accessories, in particular to a double-buckle pipe connector and a manufacturing method thereof. Background Art

[0002] The stainless steel double-buckle tube installed on the outside of the flexible hose body is used to protect the inner tube of the hose to prevent corrosion and aging. Since the double-buckle tube has good flexibility, it can bend and rotate with the inner tube and is flexible to use. The hose body generally used in faucets, sanitary ware, and shower water connections mostly adopts a stainless steel double-buckle structure, which can be bent and rotated with the inner tube. The stainless steel tube body is bright and neat and is deeply loved by consumers.

[0003] like Figure 1 As shown, the currently known connection structure of the double buckle tube is composed of an outer buckle sheet 400 and an inner buckle sheet 300. The front end of the outer buckle sheet 400 is bent downward to form an outer buckle, and the end of the inner buckle sheet 300 is bent upward to form an inner buckle. The metal double buckle tube 2 is buckled and installed between the outer buckle sheet 400 and the inner buckle sheet 300, and is buckled with the outer buckle and the inner buckle. The inner tube 1 is installed on an expansion joint 100. However, the buckling method of the outer buckle and the inner buckle of this structure has poor stability. The metal double buckle tube 2 is very easy to fall off due to external force, and the inner tube 1 will also be disengaged from the expansion joint 100 due to elastic fatigue. Summary of the invention

[0004] The object of the present invention is to provide a double buckle pipe connector. Another object of the present invention is to provide a method for manufacturing the double buckle pipe connector.

[0005] According to one aspect of the present invention, there is provided a double-buckle tube connector, comprising an inner tube, a metal double-buckle tube, and an inner sleeve and an outer sleeve arranged at the end of the inner tube, the metal double-buckle tube sleeve being arranged on the outside of the inner tube, the inner sleeve being tightly fitted on the end of the inner tube, the outer sleeve being tightly fitted on the outside of the metal double-buckle tube, the inner wall of the inner sleeve forming an annular protrusion outwardly, the protrusion corresponding to the concave portion of the inner wall of the metal double-buckle tube, after the protrusion enters the concave portion, the outer wall of the metal double-buckle tube is pressed outwardly against the inner wall of the outer sleeve, thereby forming a clamping structure to prevent the metal double-buckle tube from falling off from the inner sleeve or the outer sleeve.

[0006] Furthermore, the inner sealing sleeve is arranged inside the inner tube, and the raised portion protrudes toward the side wall of the inner tube and fits the side wall of the inner tube with the inner wall of the metal double buckle tube.

[0007] Preferably, the inner wall of the inner envelope is provided with a plurality of annular protrusions.

[0008] Furthermore, an injection molded part is provided inside the inner envelope, and an outer wall of the injection molded part enters into a groove formed inside the raised portion.

[0009] Furthermore, a nut is provided at one end of the outer envelope, and the outer end diameter of the outer envelope or the injection molded part is increased to form a restriction portion that restricts the passage of the nut. The nut slides or rotates outside the outer envelope but cannot pass through the restriction portion.

[0010] Furthermore, a trumpet-shaped interface is provided at the other end of the outer envelope, and an internal thread is provided inside the trumpet-shaped interface. The large end of the trumpet-shaped interface faces outward, and the small end slides or rotates outside the outer envelope. The diameter of the outer end of the outer envelope or the injection molded part increases to form a restricting part that restricts the small end of the trumpet-shaped interface from passing through.

[0011] Preferably, the outer end of the injection molded part has a planar gasket, and the planar gasket is arranged on the top end of the injection molded part.

[0012] The double-buckle tube connector adopting the above technical solution has a protrusion on the side wall of the inner sleeve corresponding to the concave part on the inner wall of the metal double-buckle tube. After the protrusion enters the concave part, the outer wall of the metal double-buckle tube is pressed outward against the inner wall of the outer sleeve, thereby forming a clamping structure to prevent the metal sleeve from falling off from the inner sleeve or the outer sleeve. In addition, an injection molded part is also provided inside the inner sleeve, and the outer wall of the injection molded part enters the groove formed inside the protrusion, which can strengthen the strength of the inner sleeve on the one hand, and strengthen the connection between the inner sleeve and the inner tube on the other hand, to prevent the inner tube from being pulled off.

[0013] According to another aspect of the present invention, a method for manufacturing a double-buckle pipe connector is provided, which mainly comprises the following steps:

[0014] S1. Put the inner tube, the metal double-buckle tube and the outer envelope on the outside of the inner envelope in sequence;

[0015] S2, using an expansion mold to extend into the inner envelope and expand at a predetermined position, so that the inner wall of the inner envelope forms an annular convex portion outward, and the position of the convex portion corresponds to the concave portion of the inner wall of the metal double buckle tube;

[0016] S3, transferring the expanded semi-finished product to the injection molding equipment, performing secondary injection molding on the interior of the inner envelope to form an injection molded part, and the outer wall of the injection molded part enters the groove formed on the inner side of the raised part.

[0017] Preferably, in step S3, a nut or a trumpet-shaped interface is passed through the outside of the outer envelope, and then secondary injection molding is performed.

[0018] Preferably, in step S1, a nut or a trumpet-shaped interface is also passed through the outside of the outer envelope. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the structure of the existing double buckle pipe connection structure.

[0020] Figure 2 The figure is a schematic structural diagram of a double buckle tube according to an embodiment of the present invention.

[0021] Figure 3 for Figure 2 A cross-sectional view of the double buckle tube shown.

[0022] Figure 4 for Figure 3 An enlarged view of the portion shown in A.

[0023] Figure 5 for Figure 2 Assembly drawing of the double buckle tube shown. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] Figures 2 to 5 The double-buckle pipe connector according to one embodiment of the present invention is schematically shown. As shown in the figure, the device comprises an inner pipe 1, a metal double-buckle pipe 2, and an inner seal 3 and an outer seal 4 arranged at the ends of the inner pipe 1.

[0026] The metal double-buckle sleeve 2 is arranged on the outside of the inner tube, and the inner sealing sleeve 3 is tightly fitted inside the end of the inner tube 1.

[0027] The outer envelope 4 is tightly fitted onto the outside of the metal double buckle tube 2 .

[0028] The inner wall of the inner envelope 3 forms an annular protrusion 31 outwardly.

[0029] The protrusion 31 corresponds to the concave portion 21 on the inner wall of the metal double buckle tube 2 .

[0030] After the protrusion 31 enters the recess 21 , the outer wall of the metal double buckle tube 2 is pressed outward against the inner wall of the outer envelope 4 , thereby forming a clamping structure to prevent the metal double buckle tube 2 from falling off from the inner envelope 3 or the outer envelope 4 .

[0031] The inner sealing sleeve 3 is arranged inside the inner tube 1 , and the raised portion 31 protrudes toward the side wall of the inner tube 1 and fits the side wall of the inner tube 1 with the inner wall of the metal double buckle tube 4 .

[0032] In this embodiment, a plurality of annular protrusions 31 are provided on the inner wall of the inner sealing sleeve 3 .

[0033] An injection molded part 5 is also provided inside the inner envelope 3. The injection molded part 5 and the inner envelope 3 are integrally formed.

[0034] The outer wall of the injection molded part 5 enters the groove formed inside the raised portion 31 .

[0035] A mesh nut 6 is provided at one end of the outer envelope 4, and a trumpet-shaped interface 7 is provided at the other end.

[0036] The outer end diameter of the outer sleeve 4 or the injection molded part 5 is increased to form a restriction portion for restricting the passage of the mesh nut 6 . The mesh nut 6 slides or rotates outside the outer sleeve 4 , but cannot pass through the restriction portion.

[0037] The trumpet-shaped interface 7 has internal threads inside.

[0038] The trumpet-shaped interface 7 has a large opening facing outwards, and a small opening sliding or rotating outside the outer envelope 4 .

[0039] The outer end diameter of the outer sleeve 4 or the injection molded part 5 is increased to form a restriction portion that restricts one end of the small opening of the trumpet-shaped interface 7 from passing through.

[0040] The outer end of the injection molded part 5 has a flat gasket 8, which is arranged at the top of the injection molded part 5. The flat gasket 8 is used for sealing connection between the double buckle pipe connector and the shower head or water heater.

[0041] The manufacturing method of the double-buckle pipe connector in the present invention mainly comprises the following steps:

[0042] S1, placing the inner tube 1, the metal double buckle tube 2 and the outer envelope 4 on the outside of the inner envelope 3 in sequence;

[0043] S2, using an expansion mold to extend into the inner envelope 3, and expand at a predetermined position, so that the inner wall of the inner envelope 3 forms an annular protrusion 31 outward, and the position of the protrusion 31 corresponds to the concave portion 21 of the inner wall of the metal double buckle tube 2;

[0044] S3, transferring the expanded semi-finished product to the injection molding equipment, performing secondary injection molding on the interior of the inner envelope 3 to form an injection molded part 5, and the outer wall of the injection molded part 5 enters the groove formed on the inner side of the protrusion 31.

[0045] The mesh nuts 6 or trumpet-shaped interfaces 7 at both ends of the double-buckle pipe connector can be installed on the double-buckle pipe connector in two ways:

[0046] (1) In step S3, the mesh nut 6 or the trumpet-shaped interface 7 is inserted outside the outer envelope 4, and then secondary injection molding is performed. This method is suitable for the case where the restriction portion is formed by the injection molded part 5.

[0047] (2) In step S1, the mesh nut 6 or the trumpet-shaped interface 7 is also inserted outside the outer envelope 4. This method is suitable for the case where the outer envelope 4 is used to form the restriction portion. When inserting, the inner tube 1 and the metal double buckle tube 2 are first sleeved outside the inner envelope 3 in sequence, and then the mesh nut 6 or the trumpet-shaped interface 7 is sleeved outside the outer envelope 4, and finally the envelope 4 is sleeved outside the metal double buckle tube 2.

[0048] In the double-buckle tube connector adopting the above technical solution, a protrusion 31 corresponding to the concave portion 21 on the inner wall of the metal double-buckle tube 2 is provided on the side wall of the inner sleeve 3. After the protrusion 31 enters the concave portion 21, the outer wall of the metal double-buckle tube 2 is pressed outward against the inner wall of the outer sleeve 4, thereby forming a clamping structure to prevent the metal sleeve 2 from falling off from the inner sleeve 3 or the outer sleeve 4. In addition, an injection molded part 5 is also provided inside the inner sleeve 3, and the outer wall of the injection molded part 5 enters the groove formed inside the protrusion 31, which can strengthen the strength of the inner sleeve 3 on the one hand, and can also strengthen the connection between the inner sleeve 3 and the inner tube 1 on the other hand, to prevent the inner tube 1 from being pulled off.

[0049] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A double-buckle tube connector, comprising an inner tube, a metal double-buckle tube, and an inner and outer seals arranged at the ends of the inner tube, wherein the metal double-buckle tube is sleeved on the outside of the inner tube, the inner seal is tightly sleeved inside the end of the inner tube, and the outer seal is tightly sleeved on the outside of the metal double-buckle tube, and the inner wall of the inner seal forms an annular protrusion outwardly, and the protrusion corresponds to the concave portion of the inner wall of the metal double-buckle tube. After the protrusion enters the concave portion, the outer wall of the metal double-buckle tube is pressed outwardly against the inner wall of the outer seal, thereby forming a clamping structure to prevent the metal double-buckle tube from falling off from the inner seal or the outer seal; The inner envelope is also provided with an injection molded part, and the outer wall of the injection molded part enters into the groove formed on the inner side of the raised part; A nut is provided at one end of the outer envelope, and the outer end diameter of the outer envelope or the injection molded part is increased to form a restriction portion for restricting the passage of the nut. The nut slides or rotates outside the outer envelope and cannot pass through the restriction portion.

2. The double-buckle pipe connector according to claim 1, characterized in that: The inner sealing sleeve is arranged inside the inner tube, and the protrusion protrudes toward the side wall of the inner tube and fits the side wall of the inner tube with the inner wall of the metal double buckle tube.

3. The double-buckle pipe connector according to claim 2, characterized in that: The inner wall of the inner seal is provided with a plurality of annular protrusions.

4. The double-buckle pipe connector according to claim 1, characterized in that: A trumpet-shaped interface is provided at the other end of the outer envelope, and an internal thread is provided inside the trumpet-shaped interface. The large end of the trumpet-shaped interface faces outward, and the small end slides or rotates outside the outer envelope. The outer end diameter of the outer envelope or the injection molded part is increased to form a restriction portion that restricts the small end of the trumpet-shaped interface from passing through.

5. The double-buckle pipe connector according to claim 4, characterized in that: The outer end of the injection molded part is provided with a plane gasket, and the plane gasket is arranged on the top end of the injection molded part.

6. A method for manufacturing a double-buckle pipe connector, for manufacturing the double-buckle pipe connector as claimed in any one of claims 1 to 5, mainly comprising the following steps: S1. Arrange the inner tube, the metal double-buckle tube and the outer envelope in order outside the inner envelope; S2, using an expansion mold to extend into the interior of the inner envelope and expand it at a predetermined position, so that an annular convex portion is formed outwardly on the inner wall of the inner envelope, and the position of the convex portion corresponds to the concave portion of the inner wall of the metal double buckle tube; S3, transferring the expanded semi-finished product to an injection molding device, and performing secondary injection molding on the interior of the inner envelope to form an injection molded part, wherein the outer wall of the injection molded part enters the groove formed on the inner side of the raised portion.

7. The method for manufacturing a double-buckle pipe connector according to claim 6, characterized in that: In step S3, a nut or a trumpet-shaped interface is inserted into the outside of the outer envelope, and then secondary injection molding is performed.

8. The method for manufacturing a double-buckle pipe connector according to claim 6, characterized in that: In step S1, a nut or a trumpet-shaped interface is also inserted into the outside of the outer envelope.

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