CN218903366U

CN218903366U - Expansion pipe expansion joint device

Info

Publication number: CN218903366U
Application number: CN202222787988.3U
Authority: CN
Inventors: 濮晓明; 张明洪; 吴放明
Original assignee: Wuxi Mingtong Power Accessories Co ltd
Current assignee: Wuxi Mingtong Power Accessories Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-04-25
Anticipated expiration: 2032-10-24

Abstract

The utility model discloses the technical field of tube expansion processing, in particular to a tube expansion joint device which mainly comprises a push rod, an outer sleeve, an expansion block and a sleeve; the outer sleeve is set to have not sealed tubular structure at the end, and the outer sleeve includes interior spring groove and connection boss, and the push rod includes spring and outer spring groove, symmetry and parallel arrangement are at the push rod outer wall, and the expansion block has convex surface, and the expansion block passes through the connection boss bolted connection on first bolt and the outer sleeve, and expansion block and connection boss department are provided with the torsional spring, and the sleeve passes through second bolt and outer sleeve bolted connection, and a plurality of openings are seted up to the sleeve in the side of being close to the connection boss of outer sleeve. Through setting up push rod, outer sleeve, expansion piece and sleeve mutually supporting, through expansion piece point pressure expansion pipe, make the expansion pipe take place plastic deformation, rely on frictional force to carry out the point at the heat exchanger inner wall and press fixedly, for current device, simple structure, the expansion connects reliably, low price, convenient operation.

Description

Expansion pipe expansion joint device

Technical Field

The utility model belongs to the technical field of tube expansion processing, and particularly relates to a tube expansion joint device.

Background

In the production process of the heat exchanger, the heat exchange expansion pipe and the inner wall of the heat exchanger are often required to be expanded and connected in an expansion connection mode. The heat exchange tube commonly used at present is connected with the inner wall of the heat exchanger in a threaded connection or flange connection mode, so that the connection and fixation requirements can be met, however, the structure is complex, and the production cost is high, so that the heat exchange tube is a main disadvantage. The existing expansion joint process uses the expansion bolt principle, after expansion joint is completed, the expansion bolt cannot be retracted, and the inner wall of the heat exchange tube can be damaged when the expansion bolt is reversely pulled out.

For this purpose, an expansion pipe expansion joint device is proposed.

Disclosure of Invention

The utility model aims to provide an expanded pipe fixing device, which mainly solves the problems of complex structure and higher cost of the existing expanded pipe fixing device.

To solve the problems set forth in the background art. The utility model provides the following technical scheme: an expansion pipe expansion joint device comprises a push rod, an outer sleeve, an expansion block and a sleeve; the outer sleeve is arranged to be of a cylindrical structure without a closed bottom, the outer sleeve comprises an inner spring groove and a connecting boss, the inner spring groove is symmetrical and is arranged on the inner wall of the outer sleeve in parallel, the connecting boss is arranged at the left end of the outer sleeve, the push rod comprises a spring and an outer spring groove, the outer spring groove is identical to the inner spring groove of the outer sleeve in shape and size, the spring is symmetrically and parallelly arranged on the outer wall of the push rod, the spring is arranged on the outer spring groove of the push rod and the inner spring groove of the outer sleeve, the push rod is connected with the outer sleeve through the spring, the expansion block is provided with an arc-shaped outer surface, the expansion block is connected with the connecting boss on the outer sleeve through a first bolt, the sleeve is arranged to be of a bottomless cylindrical structure, the sleeve is connected with the outer sleeve through a second bolt, and a plurality of openings are formed in the side face, close to the connecting boss of the outer sleeve.

Further, a baffle is arranged at the right end of the outer sleeve.

Further, the expansion block is arranged to be an arc boss structure.

Further, the sleeve is provided with four openings on the side surface of the connecting boss close to the outer sleeve.

Further, the number of the expansion blocks is four in accordance with the number of the sleeve openings.

Further, the four expansion blocks are uniformly arranged on the outer sleeve.

Further, the front end of the outer sleeve is connected with the sleeve bolt through a second bolt.

Further, the angle of the expansion block jacked by the push rod is 5-30 degrees.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the push rod, the outer sleeve, the expansion block and the sleeve are matched with each other, the expansion block is opened by pushing force of the push rod, the expansion pipe is pressed by the action point of the expansion block, so that the expansion pipe is subjected to plastic deformation, and the expansion pipe is fixed by pressing on the inner wall of the heat exchanger by means of friction force.

Drawings

FIG. 1 is a perspective view showing an initial state of an expanded pipe fixing device;

FIG. 2 is a perspective view of the working state of the expansion pipe fixing device;

FIG. 3 is an exploded view of the expanded pipe fixing device;

FIG. 4 is a cross-sectional view of the expansion anchor of FIG. 1 in an initial operating condition;

FIG. 5 is a cross-sectional view of the expansion fixture of FIG. 3 in a completed operational state;

in the figure: 10. a push rod; 101. an outer spring groove; 11. a spring; 20. an outer sleeve; 201. an inner spring groove; 21. a connecting boss; 22. a first bolt; 23. a nut; 24. a torsion spring; 25. a second bolt; 26. a baffle; 30. a swelling block; 40. a sleeve; 41. an inner wall of the heat exchanger; 42. and (5) expanding the pipe.

Detailed Description

The utility model is further described below with reference to examples.

The following examples are illustrative of the present utility model but are not intended to limit the scope of the utility model. The conditions in the examples can be further adjusted according to specific conditions, and simple modifications of the method of the utility model under the premise of the conception of the utility model are all within the scope of the utility model as claimed.

Referring to fig. 1 to 5, the present utility model provides an expanded pipe fixing device, which includes a push rod 10, an outer sleeve 20, an expansion block 30 and a sleeve 40. The push rod 10 comprises a spring 11 and an outer spring groove 101, the right end of the spring 11 is fixed on the outer spring groove 101 of the push rod 10 through a bolt, and the push rod 10 is in a reset state when not working under the acting force of the spring 11.

Referring to fig. 1 and 5, the outer sleeve 20 includes a baffle 26, a connection boss 21, and an inner spring groove 201. The baffle 26 is arranged on the right side of the outer sleeve 20, and the baffle 26 is fixed on the outer side of the heat exchanger when the outer sleeve 20 is inserted into the expansion tube 42, so that the fixing device can be tightly attached to the outer wall of the heat exchanger to facilitate expansion connection. The connection boss 21 is provided at the left end portion of the outer sleeve 20, and the number of the connection bosses 21 is four. The inner spring groove 201 is formed in the inner wall of the outer sleeve 20, the shape and the size of the inner spring groove 201 are the same as those of the push rod 10, the left end of the spring 11 is connected with the inner spring groove 201 of the outer sleeve 20 through bolts, and the outer sleeve 20 is connected with the push rod 10 through the spring 11 in a spring mode.

Referring to fig. 5, in order to ensure that the expansion tube 42 is gradually plastically deformed, the expansion block 30 is fixed on the inner wall 41 of the heat exchanger, the expansion block 30 is provided with an arc boss structure, the number of the expansion block 30 is four, the number of the expansion block 30 is identical to that of the connection bosses 21, the expansion block 30 and the connection bosses 21 of the outer sleeve 20 are fixedly connected through the first bolts 22, a torsion spring 24 is arranged at the joint of the expansion block 30 and the connection bosses 21, and the expansion block 30 is in a closed state when not working under the acting force of the torsion spring 24. When the expansion block 30 is pushed and contacted by the push rod 10 during operation, 4 expansion blocks 30 are supported and opened by the pushing force of the push rod 10, the acting force of the torsion spring 24 is overcome, the inner wall of the expansion pipe 42 is acted, the expansion pipe 42 is plastically deformed, the expansion block 30 is fixed on the inner wall 41 of the heat exchanger by virtue of friction, the jacking angle of the expansion block 30 by the push rod 10 is 5-30 degrees, and the expansion block 30 can be ensured not to damage the expansion pipe 42 due to overlarge supporting angle.

The sleeve 40 is fixedly connected with the front end of the outer sleeve 20 through the second bolt 25 and the bolt of the outer sleeve 20, so that the expansion block 30 of the fixing device can be conveniently inserted into the expansion pipe 42. The sleeve 40 is provided with a plurality of openings in the side of the connecting boss 21 adjacent to the outer sleeve 20. After the expansion block 30 is spread, the expansion block 30 leaks out from the opening at the side surface of the sleeve 40, and the expansion block 30 is pressed on the inner wall of the expansion pipe 42.

The working principle and the using flow of the utility model are as follows:

when the heat exchange expansion pipe is inserted into the inner wall 41 of the heat exchanger, the fixing device is inserted into the expansion pipe 42 from the head sleeve 40, the baffle 26 is tightly attached to the outer wall of the heat exchanger, the push rod 10 is pushed by the pushing device, the elastic force of the spring 11 is overcome by the push rod 10 in the pushing process, the spring 11 is continuously pushed to be in contact with the expansion block 30, the expansion block 30 overcomes the acting force of the torsion spring 24 under the pushing force of the push rod 10, the expansion blocks 30 at four corners are synchronously and gradually opened by virtue of the supporting force provided by the push rod 10, the point pressure acts on the inner wall of the expansion pipe 42, the expansion pipe 42 is plastically deformed, and the point pressure is fixed on the inner wall 41 of the heat exchanger by virtue of the friction force. After the fixing is completed, the pushing device is removed, and the push rod 10 moves outwards under the action of the spring 11, and the reset state is restored. The expansion block 30 returns to the closed state to complete expansion under the action of the torsion spring 24 under the condition that the support of the pushing force of the push rod 10 is lost, and finally the expansion device is taken out.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An expansion pipe expansion joint device comprises an outer sleeve (20), a push rod (10), an expansion block (30) and a sleeve (40); the method is characterized in that: the outer sleeve (20) is arranged to be of a cylindrical structure with two open ends, the outer sleeve (20) comprises inner spring grooves (201) which are symmetrically and parallelly arranged on the inner wall of the outer sleeve (20) and connecting bosses (21) which are arranged at the left end of the outer sleeve (20), the push rod (10) comprises springs (11) and outer spring grooves (101), the outer spring grooves (101) are identical in shape and size with the inner spring grooves (201) of the outer sleeve (20), the springs (11) are symmetrically and parallelly arranged on the outer wall of the push rod (10), the springs (11) are arranged on the outer spring grooves (101) of the push rod (10) and the inner spring grooves (201) of the outer sleeve (20), the push rod (10) is connected with the outer sleeve (20) through springs (11), the expansion blocks (30) are provided with circular arc-shaped outer surfaces, the expansion blocks (30) are connected with the connecting bosses (21) on the outer sleeve (20) through first bolts (22), torsion springs (24) are arranged at the positions of the expansion blocks (30) and the connecting bosses (21), and the sleeve (40) are arranged to be of a cylindrical structure without bottoms, and connected with the outer sleeve (40) through the second bolts (25).

2. An expanded pipe expansion joint according to claim 1, wherein: the right end of the outer sleeve (20) is provided with a baffle plate (26).

3. An expanded pipe expansion joint according to claim 1, wherein: the sleeve (40) is provided with four openings on the side surface of the connecting boss (21) close to the outer sleeve (20).

4. An expanded pipe expansion joint according to claim 1, wherein: the number of the expansion blocks (30) is four in accordance with the number of the side openings of the sleeve (40).

5. An expanded pipe expansion joint according to claim 1, wherein: the expansion block (30) is arranged to be an arc boss structure.

6. An expanded pipe expansion joint according to claim 1, wherein: the expansion blocks (30) are equally arranged on the boss of the outer sleeve (20).

7. An expanded pipe expansion joint according to claim 1, wherein: the front end of the outer sleeve (20) is connected with the sleeve (40) through a second bolt (25).

8. An expanded pipe expansion joint according to claim 1, wherein: the angle of the expansion block (30) jacked by the push rod (10) is 5-30 degrees.