CN210718752U - Variable pitch wound tube type heat exchanger - Google Patents
Variable pitch wound tube type heat exchanger Download PDFInfo
- Publication number
- CN210718752U CN210718752U CN201921047023.2U CN201921047023U CN210718752U CN 210718752 U CN210718752 U CN 210718752U CN 201921047023 U CN201921047023 U CN 201921047023U CN 210718752 U CN210718752 U CN 210718752U
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- heat exchange
- exchange tube
- pitch
- spiral heat
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- 239000012530 fluid Substances 0.000 claims abstract description 47
- 230000008859 change Effects 0.000 claims abstract description 38
- 239000000945 filler Substances 0.000 claims abstract description 10
- 230000008676 import Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 3
- 241001330002 Bambuseae Species 0.000 claims abstract description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 3
- 239000011425 bamboo Substances 0.000 claims abstract description 3
- 239000011295 pitch Substances 0.000 claims description 63
- 238000004804 winding Methods 0.000 claims description 9
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model discloses a variable pitch is around tubular heat exchanger mainly includes a center section of thick bamboo, spiral heat exchange tube bank, filler strip, tube sheet, barrel, pipe case to and shell side fluid import and export takeover and tube side fluid import and export takeover, its characterized in that: the spiral heat exchange tube bundle has three kinds of change forms, one is the gradual change type pitch structure of the same-layer spiral heat exchange tube bundle, the other is the abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle, and the third is the gradual change type pitch structure of the inner-layer and outer-layer spiral heat exchange tube bundles. The screw pitch of the heat exchange tubes in the spiral heat exchange tube bundle is changed according to the phase state change of the shell pass fluid, the shell pass fluid is in a gas state and corresponds to a small screw pitch, and the shell pass fluid is in a liquid state and corresponds to a large screw pitch, so that the convection heat exchange coefficient of the shell pass fluid is improved, the pressure drop of the shell pass fluid is reduced, and the problems that the shell pass fluid has phase change, the fluid distribution in a pipe-wound heat exchanger is uneven, the heat exchange efficiency in unit area is low, the pressure drop is large and the like are solved.
Description
Technical Field
The utility model relates to a heat exchanger technical field especially relates to a variable pitch is around tubular heat exchanger.
Background
Most of the existing tubular heat exchangers are of fin type, tube type or shell-and-tube type, heat pipe type and the like, but most of the tubular heat exchangers have the problems of not compact enough structure, uneven heat exchange and low heat transfer efficiency, and the structure of the heat exchanger needs to be improved to improve the heat exchange performance. The coiled tube type heat exchanger is a heat exchanger formed by arranging a plurality of layers of spiral heat exchange tube bundles between a central cylinder and a shell, and the spiral winding directions of the adjacent inner and outer layers of spiral heat exchange tube bundles are opposite and keep a certain distance. Compared with the traditional tube type heat exchanger, the wound tube type heat exchanger has the advantages of high heat exchange efficiency, compact structure, smaller volume and the like.
The pipe-wound heat exchanger can increase the circulation length of the tube-side fluid in a limited heat exchange space, improve the turbulence degree of the shell-side fluid and effectively improve the heat exchange efficiency; however, in the phase change (for example, boiling of a tube-side liquid or/and condensation of a shell-side steam) heat exchange process, the problems of uneven flow velocity distribution of a shell-side fluid, uneven heat exchange, large change in fluid properties, large pressure drop of the shell-side fluid and the like exist, so that the overall heat exchange effect can be reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a variable pitch wound tube heat exchanger.
The utility model adopts the technical proposal that: the utility model provides a variable pitch is around tubular heat exchanger, mainly includes a center section of thick bamboo, spiral heat exchange tube bank, filler strip, tube sheet, barrel, pipe case to and shell side fluid import and export takeover and tube side fluid import and export takeover, its characterized in that: the spiral heat exchange tube bundle comprises a heat exchange tube, an inner layer spiral heat exchange tube bundle, an outer layer spiral heat exchange tube bundle, a heat exchange tube and a heat exchange tube, wherein the heat exchange tube pitch structure of the spiral heat exchange tube bundle has three change forms, namely a gradual change type pitch structure of the same-layer spiral heat exchange tube bundle, an abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle and a gradual change type pitch structure of the; the pitch of each heat exchange tube is continuously decreased or increased along the axial direction of the heat exchanger, the pitches of the heat exchange tubes at the corresponding positions of the adjacent inner and outer layers of heat exchange tube bundles are equal, and the winding directions of the heat exchange tubes are opposite; in the abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle, the spiral heat exchange tube bundle is divided into an upper section and a lower section, the pitches of the heat exchange tubes of the two sections are different, but the pitch of the heat exchange tube of each section is the same, the pitch of the heat exchange tube at a certain position between the two sections of the spiral heat exchange tube bundle is abrupt change, the pitches of the heat exchange tubes at corresponding positions of the adjacent inner and outer layers of spiral heat exchange tube bundles are equal, and the winding; the gradual change type pitch structure of the inner-layer and outer-layer spiral heat exchange tube bundles gradually increases the pitch of the spiral heat exchange tube bundles from the inner layer to the outer layer, the pitch of the same-layer spiral heat exchange tube bundle is equal, and the winding directions of the adjacent inner-layer and outer-layer spiral heat exchange tube bundles are opposite.
The same-layer spiral heat exchange tube bundle is of a gradual change type pitch structure or an abrupt change type pitch structure, the size of the pitch of the heat exchange tube is changed according to the phase change of the shell pass fluid, the shell pass fluid is in a gas state and corresponds to a small pitch, and the shell pass fluid is in a liquid state and corresponds to a large pitch.
The abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle is characterized in that the position of the abrupt change of the pitch of the heat exchange tube between two sections of the spiral heat exchange tube bundle depends on the position of the phase change of the shell-side fluid.
And a filler strip is arranged between the adjacent inner and outer layers of spiral heat exchange tube bundles, and the distance between the distance grooves of the filler strip is consistent with the pitch of the adjacent outer layer heat exchange tube.
Compared with the prior art, the beneficial effects of the utility model are that: the pitch of the variable-pitch spiral heat exchange tube bundle can be changed according to the phase change position of the shell pass fluid, so that the phenomenon of uneven fluid distribution in the wound tube heat exchanger with phase change of the shell pass fluid is solved, the heat transfer of the shell pass fluid is enhanced, and the overall heat exchange efficiency of the wound tube heat exchanger is improved; secondly, the variable-pitch spiral heat exchange tube bundle can increase the turbulence of the shell pass fluid and further strengthen the heat transfer of the shell pass fluid; thirdly, the variable-pitch spiral heat exchange tube bundle can reduce the pressure drop of shell pass fluid, thereby improving the comprehensive performance of the heat exchanger. In a word, the tube bundle structure of the variable-pitch wound tube type heat exchanger is beneficial to improving the convection heat transfer coefficient of the shell-side fluid, reducing the pressure drop of the shell-side fluid and solving the problems of uneven fluid distribution, low heat exchange efficiency in unit area, large pressure drop and the like of the wound tube type heat exchanger with the phase-change shell-side fluid.
Drawings
Fig. 1 is a gradually-changed pitch structure wound tube type heat exchanger of a same-layer spiral heat exchange tube bundle.
Fig. 2 is a winding tube heat exchanger with an abrupt pitch structure of the same-layer spiral heat exchange tube bundle.
Reference numerals: 1-shell side fluid inlet connection pipe; 2-tube pass fluid outlet connection tube; 3-a pipe box; 4-a tube plate; 5-a central cylinder; 6-a spiral heat exchange tube bundle; 7-ear mount; 8-barrel body; 9-shell-side fluid outlet connection; 10-tube side fluid inlet connection.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
The variable-pitch wound tube type heat exchanger mainly comprises a central tube, a spiral heat exchange tube bundle, a filler strip, a tube plate, a tube body, a tube box, a shell pass fluid inlet and outlet connecting tube and a tube pass fluid inlet and outlet connecting tube. During assembly, firstly, welding and fixing two processed tube plates and a central cylinder, fixing the central cylinder at the central positions of the two tube plates, then placing the central cylinder on a roller driven by a motor, enabling a straight tube to pass through a tube hole in the tube plate at one end, rotating and bending and winding the straight tube into a spiral heat exchange tube under the action of the roller, arranging a filler strip on the bottom layer of each layer of spiral heat exchange tube bundle, and enabling the distance between distance grooves of the filler strips to be used for determining the pitch of the spiral heat exchange tube so as to realize a gradual change type pitch or an abrupt change type pitch; then the heat exchange tube passes through and is fixed in the tube hole at the corresponding position on the tube plate at the other end, the operation is repeated until the installation of the spiral heat exchange tube bundle is completed, and finally, the two ends of the spiral heat exchange tube are respectively welded and fixed with the corresponding tube plates. Then sleeving the cylinder outside the spiral tube bundle, and welding and fixing two ends of the cylinder outside the tube plate; the upper end of the cylinder body is provided with a shell pass fluid inlet connecting pipe, and the lower end of the cylinder body is provided with a shell pass fluid outlet connecting pipe. The upper end tube box and the lower end tube box are respectively welded and fixed with the upper end tube plate and the lower end tube plate, the top end of the upper end tube box is provided with a tube side fluid outlet connecting tube, and the bottom end of the lower end tube box is provided with a tube side fluid inlet connecting tube. And finally, installing the lug type support and other parts at the corresponding position of the heat exchanger.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The utility model provides a variable pitch is around tubular heat exchanger, mainly includes a center section of thick bamboo, spiral heat exchange tube bank, filler strip, tube sheet, barrel, pipe case to and shell side fluid import and export takeover and tube side fluid import and export takeover, its characterized in that: the spiral heat exchange tube bundle comprises a heat exchange tube, an inner layer spiral heat exchange tube bundle, an outer layer spiral heat exchange tube bundle, a heat exchange tube and a heat exchange tube, wherein the heat exchange tube pitch structure of the spiral heat exchange tube bundle has three change forms, namely a gradual change type pitch structure of the same-layer spiral heat exchange tube bundle, an abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle and a gradual change type pitch structure of the; the pitch of each heat exchange tube is continuously decreased or increased along the axial direction of the heat exchanger, the pitches of the heat exchange tubes at the corresponding positions of the adjacent inner and outer layers of heat exchange tube bundles are equal, and the winding directions of the heat exchange tubes are opposite; in the abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle, the spiral heat exchange tube bundle is divided into an upper section and a lower section, the pitches of the heat exchange tubes of the two sections are different, but the pitch of the heat exchange tube of each section is the same, the pitch of the heat exchange tube at a certain position between the two sections of the spiral heat exchange tube bundle is abrupt change, the pitches of the heat exchange tubes at corresponding positions of the adjacent inner and outer layers of spiral heat exchange tube bundles are equal, and the winding; the gradual change type pitch structure of the inner-layer and outer-layer spiral heat exchange tube bundles gradually increases the pitch of the spiral heat exchange tube bundles from the inner layer to the outer layer, the pitch of the same-layer spiral heat exchange tube bundle is equal, and the winding directions of the adjacent inner-layer and outer-layer spiral heat exchange tube bundles are opposite.
2. The variable pitch coiled tube heat exchanger of claim 1, wherein: the same-layer spiral heat exchange tube bundle is of a gradual change type pitch structure or an abrupt change type pitch structure, the size of the pitch of the heat exchange tube is changed according to the phase change of the shell pass fluid, the shell pass fluid is in a gas state and corresponds to a small pitch, and the shell pass fluid is in a liquid state and corresponds to a large pitch.
3. The variable pitch coiled tube heat exchanger of claim 1, wherein: the abrupt change type pitch structure of the same-layer spiral heat exchange tube bundle is characterized in that the position of the abrupt change of the pitch of the heat exchange tube between two sections of the spiral heat exchange tube bundle depends on the position of the phase change of the shell-side fluid.
4. The variable pitch coiled tube heat exchanger of claim 1, wherein: and a filler strip is arranged between the adjacent inner and outer layers of spiral heat exchange tube bundles, and the distance between the distance grooves of the filler strip is consistent with the pitch of the adjacent outer layer heat exchange tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921047023.2U CN210718752U (en) | 2019-07-06 | 2019-07-06 | Variable pitch wound tube type heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921047023.2U CN210718752U (en) | 2019-07-06 | 2019-07-06 | Variable pitch wound tube type heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210718752U true CN210718752U (en) | 2020-06-09 |
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ID=70933307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921047023.2U Expired - Fee Related CN210718752U (en) | 2019-07-06 | 2019-07-06 | Variable pitch wound tube type heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210718752U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285693A (en) * | 2019-07-06 | 2019-09-27 | 郑州大学 | Varying pitch wound tube heat exchanger |
| CN112648864A (en) * | 2020-12-30 | 2021-04-13 | 南京都乐制冷设备有限公司 | Heat exchange device for condensing VOCs gas and working method |
-
2019
- 2019-07-06 CN CN201921047023.2U patent/CN210718752U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285693A (en) * | 2019-07-06 | 2019-09-27 | 郑州大学 | Varying pitch wound tube heat exchanger |
| CN112648864A (en) * | 2020-12-30 | 2021-04-13 | 南京都乐制冷设备有限公司 | Heat exchange device for condensing VOCs gas and working method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200609 |