CN210426233U

CN210426233U - Limiting sleeve capable of preventing film of film-coated metal tube from retreating

Info

Publication number: CN210426233U
Application number: CN201920915937.XU
Authority: CN
Inventors: 杨明; 胡亚才; 钱建昌; 茹毅; 石昊
Original assignee: Quzhou Baiqiang New Material Technology Co ltd
Current assignee: Quzhou Baiqiang New Material Technology Co ltd
Priority date: 2019-06-18
Filing date: 2019-06-18
Publication date: 2020-04-28
Anticipated expiration: 2029-06-18

Abstract

The utility model discloses a can prevent stop collar that tectorial membrane tubular metal resonator membrane moved back position, including the stop collar body, it has the hole that link up to open on the stop collar body, and the downthehole wall has the recess. The utility model discloses a stop collar overlaps at the both ends of tectorial membrane tubular metal resonator in the use, prevents because of the tectorial membrane material that frequent heating and cold lead to moves back the position phenomenon.

Description

Limiting sleeve capable of preventing film of film-coated metal tube from retreating

Technical Field

The utility model relates to a heat exchanger technical field especially relates to a can prevent stop collar that tectorial membrane tubular metal resonator membrane moved back position.

Background

The film-coated metal pipe is characterized in that the surface of the metal pipe is coated in a specific mode, and the surface characteristics of the metal pipe are improved through the excellent physicochemical properties of a film material, so that the metal pipe has wider applicability and functions, such as corrosion resistance, scaling resistance, wear resistance and the like. The fluoroplastic steel pipe is taken as an example.

Patent application with publication number CN 105946194 a discloses a method for producing fluoroplastic steel tube. The fluorine plastic steel heat exchange tube is a composite material heat exchange tube used for solving the problems of corrosion, dust accumulation and scaling of the heat exchange tube. It is formed on the surface of metal pipe by soluble Polytetrafluoroethylene (PFA) or other fluoroplastics through hot melting mode and is combined with the metal pipe tightly. Because the fluoroplastic surface is smooth and the chemical property is stable, the fluoroplastic steel heat exchange tube has the characteristics of scale resistance, dust deposition resistance and corrosion resistance outside the tube. A heat exchanger based on a fluoroplastic steel heat exchange tube is called a fluoroplastic steel heat exchanger and is usually used for heat exchange occasions with serious corrosion and dust deposition problems.

In the prior fluoroplastic steel heat exchanger, the fluoroplastic steel pipe and the pipe plate are connected by expansion joint or welding. No matter which kind of connected mode, all need cut off a section with the fluoroplastic film at the tip, utilize expanded joint or welding between metal and the metal to guarantee the leakproofness of being connected of fluoroplastic steel pipe and tube sheet.

However, in the use process of the fluoroplastic steel heat exchanger, the fluoroplastic on the outer surface of the end of the fluoroplastic steel heat exchanger has a recession phenomenon (the fluoroplastic film cannot recover to the original length after being heated or cooled due to different thermal expansion coefficients of the fluoroplastic film and the steel pipe, as shown in fig. 3), which is caused by frequent heating and cooling of the heat exchange pipe in the heat exchange process (the physical and chemical properties of the fluoroplastic film change with time). The fluoroplastic retreats to cause the steel pipe originally wrapped by the fluoroplastic to be exposed to the corrosive environment again, so that the corrosion resistance and the anti-scaling performance of the heat exchanger are difficult to guarantee, and the reliability and the service life of the product are reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that the film of the film-coated metal pipe moves back in the using process, the limiting sleeve capable of preventing the film of the film-coated metal pipe from moving back is provided, the limiting sleeve is coaxially sleeved at two ends of the film-coated metal pipe and tightly hooped on the outer side of the pipe in an expansion connection mode, the problem that the film material on the outer side of the pipe contracts and moves back due to frequent heating and cooling is prevented, the performance of the film-coated metal pipe can be maintained for a long time, and the safety and the reliability of a product are improved.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a can prevent stop collar that tectorial membrane tubular metal resonator membrane moved back, includes the stop collar body, it has the hole that link up to open on the stop collar body, and the downthehole wall has the recess.

Preferably, the groove shape may be a circular arc groove, a U-shaped groove, a wave-shaped groove, or the like.

Preferably, the number of the grooves is 1 or more. The utility model has the advantages that: the limiting sleeve of the utility model is coaxially sleeved outside the film-coated metal pipe, and is tightly hooped outside the pipe through expansion connection, so as to strengthen the lamination of the film-coated material and the steel pipe; the inner wall of the limiting sleeve is provided with a groove structure, so that the outer wall of the metal pipe is protruded when expanded, and the connection among the limiting sleeve, the membrane material and the metal pipe is further enhanced (the membrane material is ensured not to generate relative displacement with the metal pipe when being frequently heated or cooled). The utility model discloses a stop collar overlaps at the both ends of tectorial membrane tubular metal resonator in the use, prevents because of the membrane material that frequent heating and cold lead to moves back the position phenomenon.

Drawings

FIG. 1 is a schematic view of a coated metal tube;

FIG. 2 is a schematic view of the connection of a coated metal tube to a tube sheet (expansion and welding);

FIG. 3 is a schematic drawing showing the film withdrawal of the film-coated metal tube;

FIG. 4 is a schematic view of the structure of the position-limiting sleeve;

FIG. 5 is a schematic view of the assembly of the stop collar with the coated metal tube;

FIG. 6 is a schematic view of the assembly of the coated metal tube as a heat exchange tube and a tube sheet in this example;

FIG. 7 is an enlarged view taken at I in FIG. 6;

in the figure, a metal tube 1, a membrane 2, a limiting sleeve body 3, a hole 4, a groove 5, a shell 6, a left tube plate 7, a right tube plate 8, a coated metal tube 9, a tube plate hole 10, a limiting sleeve 11, a sealing ring 12 and a ring groove 13.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

As shown in fig. 1, it is a schematic view of a coated metal pipe, that is, a film 2 is coated on the outer wall of a metal pipe 1 in a specific manner, and the surface characteristics of the metal pipe are improved by the excellent physicochemical properties of the film material, so that the metal pipe has wider applicability and functions, such as corrosion resistance, scaling resistance, wear resistance and the like.

As shown in FIG. 2, in the prior art, the fluoroplastic steel tube is connected with the tube plate by expansion joint or welding. In any connection mode, a section of the fluoroplastic film is cut off at the end, and welding (shown in (a) in fig. 2) or expansion joint (shown in (b) in fig. 2) between metal is utilized to ensure the connection sealing property of the fluoroplastic steel pipe and the pipe plate.

As shown in fig. 3, the schematic diagram of the film recession of the film-coated metal tube shows that the end of the film-coated metal tube is subjected to the film recession, and the recession causes the tube originally wrapped by the film to be exposed to a corrosive environment again, so that the corrosion resistance and the anti-scaling performance of the heat exchanger are difficult to guarantee, and the reliability and the service life of the product are reduced.

Based on the above problem, as shown in fig. 4, the application provides a stop collar capable of preventing a film of a film-coated metal tube from moving back, which comprises a stop collar body 3, wherein a through hole 4 is formed in the stop collar body 3, and a groove 5 is formed in the inner wall of the hole 4. When the expansion joint device is used, the limiting sleeve coaxially penetrates through the end part of the metal pipe, and a gap is reserved between the inner wall of the limiting sleeve and the outer wall of the metal pipe and used for expansion joint connection. After expansion joint, the outer wall of the metal pipe is tightly attached to the inner wall of the limiting sleeve, so that relative sliding between the outside membrane material and the metal pipe is prevented.

In order to strengthen the effect of limiting the membrane of the stop collar to move back, a groove is formed on the inner wall of the hole of the stop collar. The groove structure can enable the pipe wall to protrude into the groove when the metal pipe and the limiting sleeve are expanded and connected, so that the combination of the metal pipe and the limiting sleeve is enhanced, and the phenomenon of film retreating is inhibited (see figure 5).

In an embodiment of this application, the preferred cylinder tubular structure of stop collar body can choose hollow polygon structure according to actual installation condition for use.

In an embodiment of the present application, the grooves may be circular arc, U-shaped, wave-shaped, and the like, and the number of the grooves may be 1 or more.

In one embodiment of the present application, the material of the stopper sleeve body may be stainless steel such as SUS304 and S2205, or carbon steel such as Q235 and Q345, and preferably SUS304 stainless steel.

Example (b):

the embodiment provides an application of the limit sleeve of the utility model, a shell-and-tube heat exchanger, the heat exchange tube of which adopts a fluoroplastic steel tube, the structure of the central part is shown in figure 6, a shell 6 of the shell-and-tube heat exchanger is provided with a left tube plate 7 and a right tube plate 8, a plurality of fluoroplastic steel tubes 9 are connected between the left tube plate and the right tube plate, the left tube plate 7 and the right tube plate 8 are both provided with tube plate holes 10 with the same number as the fluoroplastic steel tubes, the left end of the fluoroplastic steel tube 9 is arranged on the tube plate hole 10 of the left tube plate in a penetrating way, the right end of the fluoroplastic steel tube 9 is arranged on the tube plate hole 10 of the right tube plate in a penetrating way, the left end and the right end of the fluoroplastic steel tube 9 are coaxially arranged at the end part of the left tube plate and the right tube, the expansion joint is used for expansion joint connection, the outer wall of the metal pipe is tightly attached to the inner wall of the limiting sleeve after expansion joint, and relative sliding between the outside membrane material and the metal pipe is prevented.

At this time, an annular groove 13 for installing a sealing ring 12 needs to be formed in the tube plate hole, and the tube plate hole 10 is connected with the outer wall of the fluoroplastic steel tube 9 through the sealing ring 12, so that the left side and the right side of the tube plate are isolated, as shown in fig. 7.

The heat exchange tube is not limited to a fluoroplastic tube, and any composite tube having a coating on the outer surface of a metal tube can be used.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. The utility model provides a can prevent stop collar that tectorial membrane tubular metal resonator membrane moved back, its characterized in that, includes the stop collar body, it has the hole that link up to open on the stop collar body, and the downthehole wall has the recess.

2. The stop collar capable of preventing the film of the film-coated metal tube from retreating according to claim 1, wherein the groove is in the shape of a circular arc groove, a U-shaped groove or a wave-shaped groove.

3. The stop collar capable of preventing the film of the film-coated metal tube from retreating according to claim 1, wherein the number of the grooves is 1 or more.