CN214470338U

CN214470338U - Novel sleeve pipe heat exchanger connection structure

Info

Publication number: CN214470338U
Application number: CN202120422093.2U
Authority: CN
Inventors: 雷龙超; 赵芬香; 朱利坤; 王红中; 长浩; 郭涛; 李海莉; 钱胜辉; 尚雪盛; 张少辉; 张云鹏; 赵学宏; 王颖; 李笑亚
Original assignee: Luoyang Zhida Petrochemical Engineering Co ltd
Current assignee: Luoyang Zhida Petrochemical Engineering Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-10-22
Anticipated expiration: 2031-02-25

Abstract

A novel double-pipe heat exchanger connecting structure comprises a connecting outer pipe and a connecting inner pipe coaxially sleeved in the connecting outer pipe, wherein the connecting outer pipe comprises a middle bridging outer bent pipe, two ends of the middle bridging outer bent pipe are respectively communicated with one end of a first outer bent pipe, the other end of each first outer bent pipe is communicated with one end of a second outer bent pipe through a first outer elbow, and the other end of the second outer bent pipe is communicated with the second outer elbow; the connecting inner pipe comprises a middle bridging inner bent pipe coaxially sleeved in the middle bridging outer bent pipe, two ends of the middle bridging inner bent pipe are communicated with one end of each first inner bent pipe respectively, the other end of each first inner bent pipe is communicated with one end of each second inner bent pipe through each first inner elbow, and the other end of each second inner bent pipe is communicated with the corresponding second inner elbow. The utility model discloses a wavy connection outer tube and connection inner tube make the pipeline wholly be circular arc transition form, can reduce the fluid resistance of shell side medium, can provide bigger heat transfer area again, also easily nondestructive test.

Description

Novel sleeve pipe heat exchanger connection structure

Technical Field

The utility model belongs to the technical field of the double tube heat exchanger, in particular to novel double tube heat exchanger connection structure.

Background

In the petrochemical industry, there are many devices to use the double-pipe heat exchanger, the common structural style of the existing double-pipe heat exchanger is shown in fig. 1, the connection form of the inner and outer sleeves is shown in fig. 2 (fig. 2 is an enlarged view of a part a in fig. 1), a shell-side heat exchange medium is arranged in the outer pipe 1, and a medium which needs to be heated or cooled is arranged in the inner pipe, so that two adjacent outer pipes 1 do not wrap the inner pipe 2 at the corner connection part, the upper and lower adjacent outer pipes 1 are welded and communicated through a connecting pipe 3, and the end part of the outer pipe is plugged by a plugging plate 4, and the structure has the following defects: (1) and the medium flow in the shell side is not smooth. The shell side is an outer pipe, the pipe side is an inner pipe, the outer pipe 1 is disconnected at the joint and is sealed by a blocking plate 4 and is welded and communicated through a connecting pipe 3, so that the flowing direction of a shell side medium is bent at a right angle, the fluid resistance is increased, and even if impurities exist in the medium, the blockage of the shell side can be caused. (2) The manufacture is difficult. The connection parts of the outer pipe 1, the inner pipe 2 and the shell pass blocking plate 4 are possibly overlapped due to too small gaps, so that two welding seams or welding seam heat affected zones are difficult to ensure, and meanwhile, the nondestructive testing cannot be realized due to the narrow space position. (3) The inner pipe 2 is exposed outside at the turning joint to influence heat exchange, and meanwhile, the connection part between the outer pipes does not have a substantial heat exchange effect due to the fact that the connection part is not wrapped on the turning section of the inner pipe, and the heat exchange area is equivalently reduced. The above-mentioned double pipe heat exchanger has great defects and shortcomings in its structure at the two side turning connecting sections, and further improvement is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel double tube heat exchanger connection structure has solved double tube heat exchanger and has connect the problem that heat exchange efficiency is low, the fluid resistance is big and manufacturing process is difficult at the outer tube.

The purpose of the utility model and the technical problem thereof are realized by adopting the following technical scheme. According to the utility model provides a novel double-pipe heat exchanger connection structure, including connecting outer tube and coaxial cover establish the connecting inner tube in connecting the outer tube, the connecting outer tube includes middle bridge connection outer bend, middle bridge connection outer bend both ends communicate with one end of first outer bend respectively, the other end of each first outer bend is linked together through first outer bend and second outer bend one end, the other end of second outer bend communicates with second outer bend; the connecting inner pipe comprises a middle bridging inner bent pipe coaxially sleeved in the middle bridging outer bent pipe, two ends of the middle bridging inner bent pipe are communicated with one end of each first inner bent pipe respectively, the other end of each first inner bent pipe is communicated with one end of each second inner bent pipe through each first inner elbow, and the other end of each second inner bent pipe is communicated with the corresponding second inner elbow.

The purpose of the utility model is further realized by adopting the following technical measures.

In an embodiment of the invention, the middle bridge-connected outer bent pipe, the middle bridge-connected inner bent pipe, the first outer bent pipe, the second outer bent pipe, the first inner bent pipe, and the second inner bent pipe are U-shaped bent pipes.

In the above connection structure, the first outer elbow, the second outer elbow, the first inner elbow and the second inner elbow are all 90 ° elbows.

In the aforementioned connection structure, the two first outer bends are symmetrically arranged with respect to the axis of symmetry of the intermediate bridging outer bend.

Borrow by above-mentioned technical scheme, the utility model discloses a wavy connection outer tube and connection inner tube, and the pipeline is the circular arc transition form on the whole, can reduce the fluid resistance of shell side medium, can provide bigger heat transfer area again to it is more convenient to make, also easily nondestructive test.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

Fig. 1 is a block diagram of a prior art double pipe heat exchanger.

Fig. 2 is a schematic view of the connection structure of adjacent flat outer tubes of a conventional double tube heat exchanger at a corner.

Fig. 3 is a schematic structural diagram of the present invention.

Fig. 4 is an exploded schematic view of the present invention.

Fig. 5 is a structural diagram of the connection inner tube of the present invention.

[ description of reference ]

5-straightening the outer tube; 6-straight inner tube;

10-connecting an outer tube; 20-connecting the inner tube;

101-intermediate bridge outer bend; 102-a first outer bend; 103-a first outer bend; 104-a second outer bend; 105-a second outer bend;

201-intermediate bridge inner bend; 202-a first inner bend; 203-a first inner bend; 204-a second inner bend; 205-second inner bend.

Detailed Description

The following detailed description is to be read in connection with the drawings and the preferred embodiments.

Referring to fig. 3 and 4, a novel connection structure of a double-pipe heat exchanger is used for connecting two adjacent and parallel straight outer pipes 5 on the double-pipe heat exchanger and straight inner pipes 6 in the straight outer pipes, the connection structure is integrally located at the corner connection position of the adjacent straight outer pipes 5, the connection structure comprises a connection outer pipe 10 and a connection inner pipe 20 coaxially sleeved in the connection outer pipe, and the connection outer pipe and the connection inner pipe are both in a wave-shaped tubular structure and are formed by adopting a sectional type welding and communicating processing technology.

Specifically, the connecting outer pipe 10 includes a middle bridging outer bent pipe 101, two ends of the middle bridging outer bent pipe 101 are respectively communicated with one end of a first outer bent pipe 102, the other end of each first outer bent pipe 102 is communicated with one end of a second outer bent pipe 104 through a first outer elbow 103, the other end of the second outer bent pipe 104 is communicated with one end of a second outer elbow 105, and the other end of each second outer elbow 105 is communicated with an existing straight outer pipe 5, so that the two adjacent straight outer pipes 5 are communicated with each other.

The connecting inner pipe 20 includes a middle bridge inner bent pipe 201 coaxially sleeved in the middle bridge outer bent pipe 101, two ends of the middle bridge inner bent pipe 201 are respectively communicated with one end of one first inner bent pipe 202, and each first inner bent pipe 202 is coaxially arranged inside the corresponding first outer bent pipe. The other end of each first inner bend 202 is communicated with one end of a second inner bend 204 through a first inner bend 203, the first inner bend 203 is coaxially arranged inside the corresponding first outer bend, and the second inner bend 204 is coaxially arranged inside the corresponding second outer bend. The other end of the second inner bend 204 is communicated with one end of a second inner bend 205, the second inner bend 205 is coaxially arranged inside the corresponding second outer bend, and the other end of each second inner bend 205 is communicated with one straight inner pipe 6, so that the two adjacent straight inner pipes 6 are communicated with each other.

In this embodiment, the middle bridge outer elbow, the middle bridge inner elbow, the first outer elbow, the second outer elbow, the first inner elbow, and the second inner elbow are all U-shaped elbows. The first outer elbow, the second outer elbow, the first inner elbow and the second inner elbow are all 90-degree elbows. All the bent pipes or the connection form between the bent pipes and the bent heads are welded, so that the integral sealing performance of the connection structure is ensured.

Referring to fig. 3, the two first outer bends 102 are arranged axisymmetrically with respect to the middle bridging outer bend 101, and are symmetrically arranged between the two first outer bends, between the two second outer bends, and between the two second outer bends; correspondingly, the connecting inner tubes are also arranged in a symmetrical structure, and the details are not repeated here. Therefore the utility model discloses connection structure is the axisymmetric structure on the whole, and its symmetry axis is the symmetry axis of middle bridging outer return bend promptly to be convenient for dock with two different straight outer tubes that are parallel to each other, adapt to the current common casing heat exchanger pipeline and lay the form.

Borrow by above-mentioned structural design, the utility model discloses a connect the outer tube and all be the wavy pipeline structure that meanders with connecting the inner tube, the smooth transition of turning, make full use of the space and effectively prolong the pipeline distance, can reduce the fluid resistance of medium in the outer tube, can provide bigger inside and outside pipe heat transfer area again to the preparation is got up more conveniently, easily carries out nondestructive test.

It is worth to be noted that, in the process of manufacturing the present invention, the bent pipes and the elbows in the connecting inner pipe are welded and communicated in sequence to form the state shown in fig. 5; then, each part for connecting the outer pipes (namely the middle bridging outer pipe, the first outer bent pipe, the first outer elbow, the second outer bent pipe and the second outer elbow) is cut into two halves along the minimum maximum bending radius, sleeved outside the corresponding coaxial part for connecting the inner pipes and subjected to butt welding, and finally, the adjacent parts for connecting the outer pipes are subjected to butt welding to form the state shown in fig. 3. The welding seams are butt welding seams, the structure is good, the welding quality is easy to guarantee, and nondestructive testing is convenient to carry out.

In another embodiment, the connecting inner tube 20 may also be formed integrally, that is, formed integrally as shown in fig. 5, which avoids welding between the bent pipes and between the bent pipes, and the sealing performance of the pipeline will be further improved.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art can easily modify, change or modify the above embodiments according to the technical spirit of the present invention without departing from the scope of the present invention.

Claims

1. The utility model provides a novel double-pipe heat exchanger connection structure which characterized in that: comprises a connecting outer pipe and a connecting inner pipe coaxially sleeved in the connecting outer pipe,

the connecting outer pipe comprises middle bridging outer bent pipes, two ends of each middle bridging outer bent pipe are respectively communicated with one end of each first outer bent pipe, the other end of each first outer bent pipe is communicated with one end of each second outer bent pipe through each first outer bent pipe, and the other end of each second outer bent pipe is communicated with the corresponding second outer bent pipe;

the connecting inner pipe comprises a middle bridging inner bent pipe coaxially sleeved in the middle bridging outer bent pipe, two ends of the middle bridging inner bent pipe are communicated with one end of each first inner bent pipe respectively, the other end of each first inner bent pipe is communicated with one end of each second inner bent pipe through each first inner elbow, and the other end of each second inner bent pipe is communicated with the corresponding second inner elbow.

2. The novel double-pipe heat exchanger connecting structure according to claim 1, wherein: the middle bridge connection outer bent pipe, the middle bridge connection inner bent pipe, the first outer bent pipe, the second outer bent pipe, the first inner bent pipe and the second inner bent pipe are all U-shaped bent pipes.

3. The novel double-pipe heat exchanger connecting structure according to claim 1, wherein: the first outer elbow, the second outer elbow, the first inner elbow and the second inner elbow are all 90-degree elbows.

4. The novel double-pipe heat exchanger connecting structure according to claim 2, characterized in that: the two first outer bends are symmetrically arranged with respect to the axis of symmetry of the intermediate bridging outer bend.