CN217604779U - Connecting pipe and heat exchanger comprising same - Google Patents
Connecting pipe and heat exchanger comprising same Download PDFInfo
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- CN217604779U CN217604779U CN202221547143.0U CN202221547143U CN217604779U CN 217604779 U CN217604779 U CN 217604779U CN 202221547143 U CN202221547143 U CN 202221547143U CN 217604779 U CN217604779 U CN 217604779U
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Abstract
The utility model discloses a connecting pipe and contain its heat exchanger, wherein, the connecting pipe is used for connecting two adjacent heat exchange tubes, the connecting pipe includes flexion and two connecting portion, two connecting portion set up the both ends of flexion, the connecting portion is connected adjacent heat exchange tube, connecting portion with flexion integrated into one piece, the pipe diameter of connecting portion is greater than the pipe diameter of flexion. The connecting pipe adopts the expand tube technology to make the pipe diameter that is located the connecting portion at both ends be greater than the pipe diameter of flexion in order to adapt to the pipe diameter demand of heat exchange tube straight tube for connecting portion insert on the straight tube and link firmly and form sealedly, have that the connection effect is better and joint strength is higher, and the cavity that forms after connecting portion and straight tube rigid coupling is difficult for producing the series flow simultaneously, has longer life.
Description
Technical Field
The utility model belongs to the heat transfer field especially relates to a connecting pipe and contain its heat exchanger.
Background
The heat exchanger is an important component of a gas-fired water heating device. Conventional heat exchangers are essentially oxygen-free copper tanks because oxygen-free copper has good thermal conductivity and is easy to machine and manufacture, but oxygen-free copper has poor corrosion resistance. The stainless steel heat exchanger is made of stainless steel materials and has good oxidation resistance. According to the data of the popularization center of the heat exchange equipment, the stainless steel heat exchanger has better heat transfer effect than the heat exchange effect of the traditional carbon steel heat exchanger, and has longer service life. The stainless steel heat exchanger is widely applied in many fields at present, and has outstanding anti-rust and anti-scaling properties.
However, stainless steel pipes are poor in workability, and the connecting pipes between the heat exchange pipes cannot be bent directly into U-shaped pipes as copper pipes do. 2 stainless steel are adopted in the trade frequently to carry out welded connection's mode with straight tube and connecting portion after tensile, and it has the welding degree of difficulty big, and inside is shone water easily, and it is difficult for detecting to shone water, problem that the yields is low.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that it is big in order to overcome the welding degree of difficulty between the heat exchange tube among the prior art, inside easy cluster water, the difficult defect that detects of cluster water provide a connecting pipe and contain its heat exchanger.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model provides a connecting pipe, the connecting pipe is used for connecting two adjacent heat exchange tubes the connecting pipe includes flexion and two connecting portion, two connecting portion set up the both ends of flexion, connecting portion with flexion integrated into one piece, the pipe diameter of connecting portion at least partly is greater than the pipe diameter of flexion.
In this technical scheme, the connecting pipe adopts the expand tube technology to make the pipe diameter that is located the connecting portion at both ends be greater than the pipe diameter of flexion in order to adapt to the pipe diameter demand of heat exchange tube straight tube for connecting portion insert on the straight tube and link firmly and form sealedly, have that the connection effect is better and joint strength is higher, and the cavity that forms after connecting portion and straight tube rigid coupling is difficult for producing the streaming simultaneously, has longer life.
Preferably, the two connecting portions are arranged in parallel, and two ends of the bending portion face to the same side.
In this technical scheme, in the heat exchanger, install in interior with parallel mode between the heat exchange tube of heat transfer fin, therefore parallel arrangement's connecting portion to and the both ends of the flexion towards same one side all are the adaptability setting made for the installation demand that is adapted to straight tube among the heat transfer fin.
Preferably, the ratio of the pipe diameter of the bending part to the center distance between the two ends of the bending part ranges from 0.45 to 0.65.
In the technical scheme, if the ratio of the pipe diameter of the bending part to the center distance between the two ends of the bending part is too small, the pipe wall of the connecting part is correspondingly thinned when the connecting part is subjected to pipe expansion, and the connecting part is easy to weld through during subsequent welding; in the case where the pipe diameter of the bent portion is thick, it is difficult to bend the bent portion, and particularly, it is difficult to obtain a bent portion having a small distance between both ends thereof, so that it is not possible to satisfy the requirement of connecting two adjacent heat exchange pipes.
Preferably, the connecting part comprises a first section, a second section and a third section which are connected in sequence along the direction away from the end part; wherein the diameter of the second section is gradually reduced towards the direction close to the end part.
In this technical scheme, the diameter of second section diminishes towards the direction that is close to the tip gradually can be convenient for connecting portion and the straight tube butt joint of heat exchange tube.
Preferably, the pipe diameter of the first section ranges from 13mm to 15mm; and/or the pipe diameter of the third section ranges from 13mm to 17mm.
Preferably, the pipe diameter of the bending part ranges from 11mm to 15mm, and/or the wall thickness ranges from 0.8mm to 1.3mm.
Preferably, the material used for the connecting pipe is stainless steel.
In this technical scheme, adopt stainless steel material to make, have better corrosion resistance and heat transfer effect, have longer life simultaneously. And the heat conduction and heat preservation effect of stainless steel is the best, can bear the heating of 650 ℃ to 680 ℃ welding flame for a long time, through even heating in the follow-up welding, the heating temperature is easy to control at the melting temperature of brazing filler metal, avoids welding and wears. And the cost of the stainless steel is lower than that of the copper pipe.
A heat exchanger comprising the connecting tube of any one of the above.
Preferably, the heat exchanger comprises: a plurality of heat transfer fin of interval align to grid, heat transfer fin has seted up a plurality of heat exchange tube mounting hole, heat exchanger includes the heat exchange tube, the heat exchange tube passes each correspond in the heat transfer fin heat exchange tube mounting hole, so that the heat exchange tube is connected on the heat transfer fin, adjacent pass through between the heat exchange tube the connecting pipe is connected.
Preferably, the connecting part and the heat exchange tube are fixed by welding.
In this technical scheme, adopt the welding to link firmly mutually between connecting portion and the heat exchange tube for the welding point is few, has joint strength higher and the difficult advantage that produces and leak.
The utility model discloses an actively advance the effect and lie in: the connecting pipe adopts the expand tube technology to make the pipe diameter that is located the connecting portion at both ends be greater than the pipe diameter of flexion in order to adapt to the pipe diameter demand of heat exchange tube straight tube for connecting portion insert on the straight tube and link firmly and form sealedly, have that the connection effect is better and joint strength is higher, and the cavity that forms after connecting portion and straight tube rigid coupling is difficult for producing the series flow simultaneously, has longer life.
Drawings
Fig. 1 is a schematic structural diagram of a stainless steel tube heat exchanger according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a connection pipe according to an embodiment of the present invention;
fig. 3 is a partially enlarged view of a connecting portion according to an embodiment of the present invention.
Description of reference numerals:
Connecting pipe 10
Bending part 101
Connecting part 102
Second section 1002
Third segment 1003
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a heat exchanger 100, which includes a housing 3 and a plurality of heat exchange fins 2 uniformly arranged at intervals, wherein the heat exchange fins 2 are provided with a plurality of heat exchange tube mounting holes, the heat exchanger 100 includes heat exchange tubes, and the heat exchange tubes pass through corresponding heat exchange tube mounting holes in each heat exchange fin 2, so that the heat exchange tubes are connected to the heat exchange fins, and adjacent heat exchange tubes are connected through a connection tube 10.
In the present embodiment, the connection pipe 10 includes a bending portion 101 and two connection portions 102, the two connection portions 102 are disposed at two ends of the bending portion 101, the connection portions 102 connect two adjacent heat exchange pipes, the connection portions 102 and the bending portion 101 are integrally formed, and a pipe diameter of at least a portion of the connection portions 102 is greater than a pipe diameter of the bending portion 101.
The connecting pipe 10 adopts a pipe expanding process to ensure that the pipe diameter of the connecting part 102 positioned at the two ends is larger than that of the bending part 101 so as to adapt to the pipe diameter requirement of the straight pipe of the heat exchange pipe, so that the connecting part 102 is inserted into the straight pipe to be fixedly connected and sealed, the connecting effect is good, the connecting strength is high, and meanwhile, a cavity formed after the connecting part 102 is fixedly connected with the straight pipe is not easy to generate streaming and has long service life.
In the present embodiment, the material used for the connection pipe 10 is stainless steel. The stainless steel heat exchanger is made of stainless steel materials, has good corrosion resistance and heat exchange effect, and has long service life. And the heat conduction and heat preservation effect of stainless steel is the best, can bear the heating of 650 ℃ to 680 ℃ welding flame for a long time, through even heating in the follow-up welding, the heating temperature is easy to control at the melting temperature of brazing filler metal, avoids welding and wears. And the cost of the stainless steel is lower than that of the copper pipe.
In the present embodiment, the two connecting portions 102 are disposed in parallel, and both ends of the bending portion 101 face the same side and are disposed flush with each other. In the heat exchanger 100, the heat exchange tubes of the heat exchange fins are installed in parallel, so the connecting portions 102 arranged in parallel and both ends of the bent portion 101 facing the same side are both disposed adaptively to the installation requirements of the straight tubes in the heat exchange fins, and secondly, also for the convenience of processing.
It should be noted that, in other alternative embodiments, the end surfaces of the heat exchange tubes in the heat exchanger 100 may not be disposed flush, and may be adapted according to the structure and shape of the heat exchange tubes, which is not limited herein. Correspondingly, for the arrangement of the heat exchange tubes, the portion of the connecting tube 10 abutting against the heat exchange tube is also adaptively adjusted as long as two adjacent heat exchange tubes can be connected, and the arrangement is not particularly limited herein.
In the present embodiment, the ratio of the pipe diameter of the curved portion 101 to the center distance of both ends of the curved portion 101 ranges from 0.45 to 0.65. If the ratio of the pipe diameter of the bending portion 101 to the center distance between the two ends of the bending portion 101 is too small, when the connecting portion 102 is subjected to pipe expansion, the pipe wall of the connecting portion 102 becomes relatively thin, and the pipe wall is easy to weld through during subsequent welding; if the pipe diameter of the bent portion 101 is thick, it is difficult to bend the bent portion 101, and particularly, it is difficult to obtain a bent portion having a small distance between both ends, so that it is not possible to satisfy the requirement of connecting two heat exchange pipes which are adjacent to each other.
In specific implementation, the pipe diameter of the bending part 101 is 13mm, the wall thickness is 0.8mm, and the distance between the two ends of the center of the bending part 101 after bending is 27mm. In alternative embodiments, the diameter of the bend 101 may be in the range of 11mm to 15mm, the wall thickness in the range of 0.8mm to 1.3mm, and the distance between the center and ends of the bend 101 may be in the range of 25 mm to 29mm. The shape of the stainless steel pipe is not particularly limited as long as the stainless steel pipe can be bent and connected with two adjacent heat exchange pipes.
In the present embodiment, the connecting portion 102 includes a first section 1001, a second section 1002, and a third section 1003 that are connected in order in the direction away from the end; wherein the diameter of the second section 1002 gradually decreases toward the end. The diameter of the second section 1002 gradually decreases toward the end, which can facilitate the butt joint of the connection portion 102 and the straight tube of the heat exchange tube.
In specific implementation, the pipe diameter of the first section 1001 is 13mm, and the pipe diameter of the third section 1003 is 17mm, and in other alternative embodiments, the pipe diameter range of the first section 1001 needs to meet 13mm-15mm; the diameter range of the third section 1003 needs to meet 13mm-17mm. The connection portion 102 is not particularly limited as long as it can facilitate the butt connection with the straight pipe of the heat exchange pipe.
It should be noted that, in other alternative embodiments, the end of the connecting portion may also be sleeved with the heat exchange tube straight tube, as long as the connecting portion can be connected with the heat exchange tube straight tube, which is not limited herein.
After the connection pipe 10 is butted with the heat exchange pipe straight pipe, the connection part 102 is fixed with the heat exchange pipe by welding. So that the welding points are few, and the connecting device has the advantages of high connecting strength and difficult water leakage.
Example 2
The present embodiment provides a method for manufacturing a connection tube 10, which includes the following steps:
1. preparing materials: cutting a stainless steel connecting pipe 10 with the original pipe diameter of 13mm and the pipe wall thickness of 0.8mm according to the specification of the heat exchange pipe;
2. manufacturing a bent pipe:
1. inserting the core mold into the connection pipe 10;
2. placing the connecting pipe 10 with the inserted die core in the movable clamp die and the rotary clamp die, and closing and clamping the dies;
3. bending the connecting pipe 10 section around the rotary clamping die by a pipe bending machine head through a guide die;
4. loosening the clamping die and taking out the bent pipe;
3. performing tube expansion processing on the end part of the connecting tube 10:
flaring the end of the connecting pipe 10 by using a flaring device with the diameter of a cylinder being 0.2mm larger than the diameter of the inserted pipe, inserting the cylinder with the bent-diameter head of the flaring device into the port to the forming part, and then pulling out the flaring device to form a connecting part 102 with a larger pipe diameter at the end of the connecting pipe 10;
4. welding:
and embedding a pure copper welding ring at the joint of the connecting pipe 10 and the heat exchange pipe, putting the heat exchanger into a mesh-belt type brazing furnace, and forming after the heat exchanger flows out.
In summary, the heat exchanger provided in embodiment 1 and the method for manufacturing the connection pipe provided in embodiment 2 have the following advantages: the connecting pipe 10 adopts a pipe expanding process to ensure that the pipe diameter of the connecting part 102 positioned at the two ends is larger than that of the bending part 101 so as to adapt to the pipe diameter requirement of the straight pipe of the heat exchange pipe, so that the connecting part 102 is inserted into the straight pipe to be fixedly connected and sealed, the connecting effect is good, the connecting strength is high, and meanwhile, a cavity formed after the connecting part 102 is fixedly connected with the straight pipe is not easy to generate streaming and has long service life.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The utility model provides a connecting pipe, the connecting pipe is used for connecting two adjacent heat exchange tubes, a serial communication port, the connecting pipe includes flexion and two connecting portion, two connecting portion set up the both ends of flexion, connecting portion with flexion integrated into one piece, the pipe diameter of connecting portion at least partly is greater than the pipe diameter of flexion.
2. The connecting tube according to claim 1, wherein the two connecting portions are arranged in parallel, and both ends of the bent portion face the same side.
3. The connecting pipe according to claim 1, wherein a ratio of a pipe diameter of the bent portion to a center distance of both ends of the bent portion ranges from 0.45 to 0.65.
4. The connecting tube of claim 1, wherein the connecting portion includes a first section, a second section, and a third section connected in series in a direction away from the end portion;
wherein the diameter of the second section is gradually reduced towards the direction close to the end part.
5. The connecting tube of claim 4, wherein the first section has a tube diameter in the range of 13mm to 15mm; and/or the pipe diameter of the third section ranges from 13mm to 17mm.
6. A connecting tube according to claim 1, characterized in that the tube diameter of the curve is in the range of 11mm-15mm and/or the wall thickness of the curve is in the range of 0.8mm-1.3mm.
7. The connecting tube of claim 1, wherein the material used for the connecting tube is stainless steel.
8. A heat exchanger, characterized by comprising a connection tube according to any one of claims 1-7.
9. The heat exchanger of claim 8, wherein the heat exchanger comprises: the heat exchanger comprises heat exchange tubes, the heat exchange tubes penetrate through the heat exchange tube mounting holes corresponding to the heat exchange fins, so that the heat exchange tubes are connected to the heat exchange fins, and the adjacent heat exchange tubes are connected through the connecting tubes.
10. The heat exchanger as claimed in claim 8, wherein the connection part and the heat exchange tube are fixed by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221547143.0U CN217604779U (en) | 2022-06-17 | 2022-06-17 | Connecting pipe and heat exchanger comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221547143.0U CN217604779U (en) | 2022-06-17 | 2022-06-17 | Connecting pipe and heat exchanger comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217604779U true CN217604779U (en) | 2022-10-18 |
Family
ID=83589452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221547143.0U Active CN217604779U (en) | 2022-06-17 | 2022-06-17 | Connecting pipe and heat exchanger comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217604779U (en) |
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2022
- 2022-06-17 CN CN202221547143.0U patent/CN217604779U/en active Active
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