CN211853121U

CN211853121U - Extension joint

Info

Publication number: CN211853121U
Application number: CN201922493642.0U
Authority: CN
Inventors: 王金三; 邵志超; 刘小军
Original assignee: XIAMEN SANIDENG PLASTICS INDUSTRY CO LTD
Current assignee: XIAMEN SANIDENG PLASTICS INDUSTRY CO LTD
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-11-03
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a by order formula telescopic joint, including sleeve pipe, piston pipe, coupling, gland, first nut and second nut. The threaded connection through sleeve pipe and first nut is in the same place coupling, sleeve pipe and first nut lock joint, and threaded connection through sleeve pipe and second nut is in the same place gland, sleeve pipe and second nut lock joint, and the part between location step and gland constitutes the gliding stroke of location bulge loop, the utility model discloses with the telescopic joint with by the ingenious combination of current formula together, can install and remove, constitute swing joint, for by current formula structure, can connect various systems in a flexible way, it is convenient to maintain, the telescopic joint small in size, flexible stroke is reasonable, low cost.

Description

Extension joint

Technical Field

The utility model relates to a spare part of expansion valve especially relates to a by order formula telescopic joint.

Background

The conventional telescopic joint comprises a sleeve, a piston pipe and two fixed joints, wherein the piston pipe can be connected in the sleeve in a sliding mode along the direction of the sleeve. The inner end of the piston tube extends outwards to form a positioning convex ring, the positioning convex ring is connected in the sleeve in an adaptive mode, the two fixing joints are bonded at the two ends of the sleeve through glue, a sliding range for the positioning convex ring to slide is formed between the two fixing joints, and the outer end of the piston tube extends out of one fixing joint. The fixed joint and the sleeve are bonded by glue, and are fixed and not detachable.

SUMMERY OF THE UTILITY MODEL

The utility model provides a by order formula telescopic joint, it has overcome the not enough that telescopic joint exists among the background art.

The utility model provides an adopted technical scheme of its technical problem is:

the extension joint comprises a sleeve and a piston pipe, wherein the piston pipe can be connected in the sleeve in a sliding manner along the direction of the sleeve; the pipe joint is characterized by also comprising a pipe joint, a gland, a first screw cap and a second screw cap; the first port of the sleeve extends inwards to form a positioning step, the inner port of the pipe joint extends outwards to form a first locked flange, the gland is provided with a second locked flange extending outwards, the outer port of the first screw cap extends inwards to form a first locking flange, and the outer port of the second screw cap extends inwards to form a second locking flange; the pipe joint is abutted to the first end of the sleeve, the first nut is screwed to the first end of the sleeve, and the end surface of the inner end of the pipe joint is abutted to the end surface of the first end of the sleeve and the first locking flange is abutted to the first locked flange through screwing of the first nut and the sleeve; the gland is abutted against the second end of the sleeve, the second nut is screwed at the second end of the sleeve, and the end surface of the inner end of the gland is abutted against the end surface of the second end of the sleeve and the second locking flange is abutted against the second locked flange through screwing of the second nut and the sleeve; the inner end of the piston tube protrudes outwards to form a positioning convex ring, the positioning convex ring is connected to the inner cavity of the sleeve in an adaptive mode, the outer end of the piston tube extends out of the gland and the second screw cap, and the part between the positioning step and the gland forms a sliding path for the positioning convex ring to slide.

In one embodiment: a first sealing ring is arranged between the outer peripheral wall of the positioning convex ring and the inner peripheral wall of the sleeve, and a second sealing ring is arranged between the inner end face of the pipe joint and the outer end face of the positioning step.

In one embodiment: the gland is of an annular structure, and the periphery of the inner end of the annular structure of the gland extends outwards to form the second locking flange.

In one embodiment: the inner end opening inner peripheral wall of the piston tube comprises a first rotary wall section and a conical wall section which is connected with the first rotary wall section and is large in outside and small in inside, and a second rotary wall section is arranged on the inner peripheral wall of the outer end opening of the piston tube.

In one embodiment: the piston tube inner wall further comprises a third wall section of revolution connected between the conical wall section and the second wall section of revolution, the third wall section of revolution having an inner diameter equal to the inner diameter of the conical wall section, and the first wall section of revolution having an inner diameter equal to the inner diameter of the second wall section of revolution.

Compared with the background technology, the technical scheme has the following advantages:

the pipe joint, the sleeve and the first nut are locked together through the threaded connection of the sleeve and the first nut, the gland, the sleeve and the second nut are locked together through the threaded connection of the sleeve and the second nut, and the part between the positioning step and the gland forms the sliding course of the positioning convex ring, so that the defects existing in the background art are overcome, and the following technical effects are generated: firstly, the telescopic joint and the flexible joint are skillfully combined together, can be assembled and disassembled to form a movable connection, is of a flexible structure, can be flexibly connected with various systems, and is convenient to maintain; secondly, the expansion joint is small in size and reasonable in expansion stroke, and the problem of expansion caused by heat and contraction caused by cold of the pipeline can be solved; thirdly, the cost is low.

Drawings

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Fig. 1 is a perspective view of a free telescopic joint according to an embodiment.

Fig. 2 is a schematic cross-sectional view of an embodiment with a telescopic joint at the shortest distance.

FIG. 3 is a schematic cross-sectional view of an embodiment with the telescopic joint at the longest distance.

Fig. 4 is a perspective exploded view of a telescopic joint according to an embodiment.

Detailed Description

Referring to fig. 1 to 4, a telescopic joint of the slip joint includes a sleeve 1, a piston tube 2, a tube connector 3, a gland 4, a first nut 5 and a second nut 6.

The first port of the sleeve 1 extends inwards to form a positioning step 11, and the outer end face of the positioning step 11 is flush with the end face of the first port of the sleeve 1; the inner end of the piston tube 2 protrudes outwards to form a positioning convex ring 21, and the end surface of the positioning convex ring 21 is flush with the end surface of the inner end of the piston tube 2; the inner port of the pipe joint 3 extends outwards to form a first locked flange 31; the gland 4 is of an annular structure, and the periphery of the inner end of the annular structure of the gland 4 extends outwards to form a second locking flange 41; the outer port of the first nut 5 extends inwards to form a first locking flange 51, and the outer port of the second nut 6 extends inwards to form a second locking flange 61.

The pipe joint 3 is abutted against the first end of the sleeve 1, the first nut 5 is screwed at the first end of the sleeve 1, the inner end face of the pipe joint 3 is abutted against the first end face of the sleeve 1 and the first locking flange 51 is abutted against the first locked flange 31 through the screwing of the first nut 5 and the sleeve 1, so that the pipe joint 3, the sleeve 1 and the first nut 5 are locked together. Wherein: the pipe joint 3 is used for connecting external fluid output or input and has a connecting function; the end surface of the inner end of the pipe joint 3 is abutted against the end surface of the positioning step 11 of the sleeve 1.

The positioning convex ring 21 of the piston tube 2 is connected to the inner cavity of the sleeve 1 in an adaptive manner, and the outer end of the piston tube 2 extends out of the gland 4 and the second nut 5, so that the piston tube 2 can be connected in the sleeve 1 in a sliding manner along the direction of the sleeve 1.

The gland 4 abuts against the second end of the sleeve 1, the second nut 6 is in threaded connection with the second end of the sleeve 1, the end face of the inner end of the gland 4 abuts against the end face of the second end of the sleeve 1 and the second locking flange 61 abuts against the second locked flange 41 through the screwing of the second nut 6 and the sleeve 1, and the gland 4, the sleeve 1 and the second nut 6 are locked together. The part between the positioning step 11 and the gland 4 forms the sliding distance of the positioning convex ring 21 of the piston tube 2, the telescopic joint is in the shortest distance when abutting against the positioning convex ring 21, as shown in fig. 2, and the telescopic joint is in the longest distance when abutting against the gland 4, as shown in fig. 3. Wherein: the outer end of the piston tube 2 can also be connected to an external fluid outlet or inlet.

A first sealing ring 12 is arranged between the outer peripheral wall of the positioning convex ring 21 and the inner peripheral wall of the sleeve 1, and two first sealing rings 12 can be arranged according to requirements; and a second sealing ring 13 is arranged between the inner end face of the pipe joint 3 and the outer end face of the positioning step 11, the sealing ring layout is ingenious, the number of the sealing rings is reduced, and the sealing performance is improved.

The inner end inner peripheral wall of the piston tube 2 comprises a first revolving wall section 22 and a conical wall section 23 which is connected with the first revolving wall section 22 and has a large outer part and a small inner part, and the outer end inner peripheral wall of the piston tube 2 is provided with a second revolving wall section 24; the piston tube 2 inner wall further comprises a third section of revolution wall 25 connected between the conical wall section 23 and the second section of revolution wall 24, the third section of revolution wall 25 inner diameter and the conical wall section 23 inner diameter being equal, the first section of revolution wall 22 inner diameter and the second section of revolution wall 24 inner diameter being equal. By adopting the structure, on one hand, the fluid is convenient to be communicated, on the other hand, the fluid flow velocity can be slowed down, and the noise and the vibration are reduced.

The modern expansion joint of this embodiment can promote the product practicality, enlarges application, reduce cost, promotes product competitiveness. The method specifically comprises the following steps: the whole product can be easily disassembled by adopting a combined mode of a sleeve and a nut, so that the maintenance is convenient; the part between the positioning step and the gland forms a sliding stroke for sliding the positioning convex ring, the telescopic stroke is reasonable, the size is smaller, the cost is lower, and the competitiveness of the product is improved; by-order connection is adopted, different systems can be flexibly switched, and the application field is expanded.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

1. The extension joint comprises a sleeve and a piston pipe, wherein the piston pipe can be connected in the sleeve in a sliding manner along the direction of the sleeve; the method is characterized in that: the pipe joint is characterized by also comprising a pipe joint, a gland, a first screw cap and a second screw cap; the first port of the sleeve extends inwards to form a positioning step, the inner port of the pipe joint extends outwards to form a first locked flange, the gland is provided with a second locked flange extending outwards, the outer port of the first screw cap extends inwards to form a first locking flange, and the outer port of the second screw cap extends inwards to form a second locking flange; the pipe joint is abutted to the first end of the sleeve, the first nut is screwed to the first end of the sleeve, and the end surface of the inner end of the pipe joint is abutted to the end surface of the first end of the sleeve and the first locking flange is abutted to the first locked flange through screwing of the first nut and the sleeve; the gland is abutted against the second end of the sleeve, the second nut is screwed at the second end of the sleeve, and the end surface of the inner end of the gland is abutted against the end surface of the second end of the sleeve and the second locking flange is abutted against the second locked flange through screwing of the second nut and the sleeve; the inner end of the piston tube protrudes outwards to form a positioning convex ring, the positioning convex ring is connected to the inner cavity of the sleeve in an adaptive mode, the outer end of the piston tube extends out of the gland and the second screw cap, and the part between the positioning step and the gland forms a sliding path for the positioning convex ring to slide.

2. A slip joint according to claim 1, wherein: a first sealing ring is arranged between the outer peripheral wall of the positioning convex ring and the inner peripheral wall of the sleeve, and a second sealing ring is arranged between the inner end face of the pipe joint and the outer end face of the positioning step.

3. A slip joint according to claim 1, wherein: the gland is of an annular structure, and the periphery of the inner end of the annular structure of the gland extends outwards to form the second locking flange.

4. A telescopic joint according to claim 1, 2 or 3, wherein: the inner end opening inner peripheral wall of the piston tube comprises a first rotary wall section and a conical wall section which is connected with the first rotary wall section and is large in outside and small in inside, and a second rotary wall section is arranged on the inner peripheral wall of the outer end opening of the piston tube.

5. A slip joint according to claim 4, wherein: the piston tube inner wall further comprises a third wall section of revolution connected between the conical wall section and the second wall section of revolution, the third wall section of revolution having an inner diameter equal to the inner diameter of the conical wall section, and the first wall section of revolution having an inner diameter equal to the inner diameter of the second wall section of revolution.