CN115789999A - Jet cooling heat exchanger - Google Patents
Jet cooling heat exchanger Download PDFInfo
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- CN115789999A CN115789999A CN202211348699.1A CN202211348699A CN115789999A CN 115789999 A CN115789999 A CN 115789999A CN 202211348699 A CN202211348699 A CN 202211348699A CN 115789999 A CN115789999 A CN 115789999A
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Abstract
The invention discloses a jet cooling heat exchanger which comprises a shell and a plurality of heat exchange tubes, wherein the heat exchange tubes are arranged in an array structure to form a heat exchange tube bundle and are used for circulating a cooling working medium with pressure. The heat exchange tube comprises an upstream gradually-reduced tube section, a middle heat exchange tube section and a downstream gradually-expanded tube section, metal fins are arranged on the outer wall of the middle heat exchange tube section to strengthen heat exchange, the middle heat exchange tube section is an equal-diameter heat exchange tube section or a gradually-expanded heat exchange tube section, and aiming at working media with weak compressibility and strong compressibility, the heat exchange tube can be connected end to end by adopting an elbow to form serial arrangement and is arranged in parallel into a multi-flow channel or is arranged in parallel into a multi-flow channel by adopting a plurality of layers of serpentine tubes; the shell is used for fixing the heat exchange tube bundle and forming a cooling space, and cooled fluid flows across the heat exchange tube bundle in the shell to exchange heat. The invention realizes refrigeration by utilizing the fluid with pressure and can be used for recovering the industrial excess pressure.
Description
Technical Field
The invention belongs to the technical field of jet cooling heat exchange devices, and particularly relates to a jet cooling heat exchanger.
Background
Refrigeration/cooling is a common energy consumption process in daily life and industrial processes, has great energy-saving requirements and potential, and has important value and significance for reducing cooling and heat exchange energy consumption and improving the environment by developing a high-efficiency refrigeration heat exchanger.
In the existing refrigeration system, a throttle valve or a capillary tube is usually adopted to realize throttling and cooling of a high-pressure working medium, and then the high-pressure working medium enters a conventional heat exchanger (a shell-and-tube type, a plate type, a sleeve type and the like) to realize refrigeration. However, the throttling process causes great efficiency loss and low refrigeration efficiency, the temperature of the throttled low-temperature fluid is related to throttling equipment and a cooled working medium and is in a nonlinear relationship, the cooling temperature needs to be gradually fed back and adjusted, and the adjusting process is relatively complex and consumes long time.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a jet flow cooling heat exchanger, which solves the technical problems of great loss of efficiency and relatively complex adjustment process caused by the flow throttling process in the existing refrigeration system.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a jet cooling heat exchanger, which comprises a shell and a plurality of heat exchange tubes;
the heat exchange tubes are arranged in an array to form a heat exchange tube bundle, and each heat exchange tube comprises an upstream gradually-reduced tube section, a middle heat exchange tube section and a downstream gradually-expanded tube section;
the heat exchange tube bundle is arranged across the shell, the middle heat exchange tube sections of all the heat exchange tubes are arranged in the shell, and the upstream gradually-reduced tube section and the downstream gradually-expanded tube section are arranged outside the shell;
the working medium inlet end and the working medium outlet end of the heat exchange tube bundle are respectively connected with a cooling working medium pipeline;
and the working medium inlet end and the working medium outlet end of the shell are respectively connected with the cooled fluid pipeline.
Preferably, the heat exchange tube bundle is formed by connecting a plurality of heat exchange tubes end to end in series through elbows to form a serpentine pipeline.
Preferably, the heat exchange tube bundle is formed by arranging a plurality of heat exchange tubes in parallel into a plurality of flow channels, and a fluid distributor is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange.
Preferably, the heat exchange tube bundle is provided with a plurality of layers of serpentine pipelines in parallel to form a multi-channel, and each layer of serpentine pipeline is formed by connecting a plurality of heat exchange tubes end to end through an elbow; and a fluid distributor is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange.
Preferably, the outer wall of the middle heat exchange tube section is provided with a metal fin.
Further preferably, the metal fin is a rectangular metal fin or a wavy metal fin.
Further preferably, the metal fin is fixedly connected with the heat exchange tube in a welding or tube expansion mode.
Preferably, the intermediate heat exchange tube section is an equal diameter heat exchange tube section or a divergent heat exchange tube section.
Preferably, the working medium inlet end and the working medium outlet end of the heat exchange tube bundle are respectively connected with the cooling working medium pipeline through a cooling working medium connecting flange; the working medium inlet end and the working medium outlet end of the shell are respectively connected with a cooled fluid pipeline through a cooled fluid connecting flange.
Preferably, the heat exchange tube is fixed to the housing by welding.
Compared with the prior art, the invention has the following beneficial effects:
the jet cooling heat exchanger provided by the invention has the advantages that: the first heat exchange tube bundle is combined in an array structure and is used for circulating a cooling working medium with pressure; the second heat exchange tube traverses the shell, the shell is used for fixing the heat exchange tube bundle and forming a cooling heat exchange space in the shell, and the cooled fluid flows in the shell and exchanges heat with the heat exchange tube bundle; thirdly, because the heat exchange tubes are divided into three sections, the middle heat exchange tube section is arranged in the shell, the other two sections are arranged outside the shell, working medium for cooling under pressure flows in from the upstream tapered tube section, the speed is increased, the pressure is reduced, and the temperature is reduced, the obtained low-temperature fluid enters the middle heat exchange tube section and exchanges heat with the cooled fluid in the shell, the speed is increased after the low-temperature fluid absorbs heat, part of absorbed heat can be converted into pressure energy, the low-temperature heat utilization is realized, the pressure drop of the heat exchanger is reduced, the internal energy of the low-temperature fluid is increased, the flow speed of the working medium is further increased, the obtained high-speed fluid flows in the tapered tube section, the pressure is increased, the temperature is reduced, and the high-temperature fluid under pressure is further obtained. In conclusion, the jet cooling heat exchanger provided by the invention can reduce throttling loss in the prior refrigeration technology, improve refrigeration efficiency, control cooling temperature easily, and realize high-efficiency refrigeration of fluid under pressure. In addition, the jet flow cooling heat exchanger provided by the invention is based on the expansion and cooling principle of the nozzle, the working medium with pressure is accelerated, depressurized and cooled through a reducing pipeline to generate cold energy, the low temperature generated by the working medium only depends on the state of high-pressure fluid, the specified low temperature can be obtained only by adjusting the pressure and the temperature of the fluid with pressure in an external system, and the adjusting process is simple. And the high-speed working medium is boosted through the divergent pipeline after heat exchange, so that the throttling loss is reduced compared with the conventional throttling and low temperature generation, and the energy conservation is realized.
Furthermore, the heat exchange tube bundle is formed by connecting a plurality of heat exchange tubes in series end to end through the elbow to form a serpentine pipeline, so that the length of the heat exchange tubes is prolonged, the heat exchange area is increased, and the heat exchange tubes are connected in sequence according to the array structure of the heat exchange tube bundle to ensure the compact structure of the heat exchanger.
Furthermore, the heat exchange tube bundle is provided with a plurality of heat exchange tubes in parallel to form a plurality of flow channels, the working medium flow is large, the heat exchange quantity is large under a smaller heat exchange area, and the heat flux density is high. And a fluid distributor is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange so as to ensure that the working medium is uniformly distributed in each flow passage.
Furthermore, the heat exchange tube bundle is provided with a plurality of layers of serpentine pipelines in parallel to form a plurality of runners, and each layer of serpentine pipeline is formed by connecting a plurality of heat exchange tubes end to end through elbows; and a fluid distributor is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange, so that a large heat exchange area can be obtained, the pipeline loss is reduced, and the size of the heat exchanger is reduced.
Furthermore, the outer wall of the middle heat exchange tube section is provided with metal fins which can strengthen heat exchange, the metal fins are rectangular metal fins or wavy metal fins, the spacing between the metal fins can be adjusted according to specific requirements such as heat exchange power, and the metal fins are fixedly connected with the heat exchange tube in a welding or tube expansion mode.
Furthermore, the middle heat exchange pipe section is an equal-diameter heat exchange pipe section so as to aim at the working medium with weak compressibility; the middle heat exchange pipe section of the heat exchange pipe is a gradually expanding heat exchange pipe section so as to aim at the working medium with strong compressibility.
Drawings
Fig. 1 is a schematic perspective structural view of a single-channel series-connection jet cooling heat exchanger of a jet cooling heat exchanger disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic perspective view of a multi-channel parallel jet cooling heat exchanger of the jet cooling heat exchanger disclosed in embodiment 2 of the present invention;
fig. 3 is a schematic perspective view of a double-flow-passage series-parallel connection jet cooling heat exchanger of the jet cooling heat exchanger disclosed in embodiment 3 of the present invention;
FIG. 4 is a schematic cross-sectional view of an intermediate heat exchange tube section of the present invention in the form of an equal diameter heat exchange tube section;
FIG. 5 is a schematic cross-sectional view of a gradually expanding heat pipe section of the present invention;
FIG. 6 is a schematic view of a rectangular metal fin heat exchanger tube bundle according to the present invention;
fig. 7 is a schematic structural view of a corrugated metal fin heat exchange tube bundle of the present invention.
Wherein: 1-a cooled fluid connection flange; 2-a shell; 3-cooling working medium connecting flange; 4-heat exchange tube; 5-bending the pipe; 6-a fluid dispenser; 7-rectangular metal fins; 8-wave-shaped metal fins; 9-an upstream tapered pipe section; 10-a downstream divergent section; 11-intermediate heat exchange tube section.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
example 1
Referring to fig. 1, the schematic view of the three-dimensional structure of a single-channel series-connected jet cooling heat exchanger of a jet cooling heat exchanger disclosed by the invention comprises a cooled fluid connecting flange 1, a shell 2, a cooling medium connecting flange 3, a heat exchange tube bundle consisting of a plurality of heat exchange tubes 4 and an elbow 5. The heat exchange tubes 4 are arranged in an array structure and used for circulating a cooling working medium with pressure, and each heat exchange tube 4 comprises an upstream gradually-reduced tube section 9, a middle heat exchange tube section 11 and a downstream gradually-expanded tube section 10; the elbow 5 connects a plurality of heat exchange tubes 4 end to end and is arranged in series to form a snake-shaped pipeline; the inlet end and the outlet end of the heat exchange tube bundle are respectively connected with a cooling working medium pipeline through a cooling working medium connecting flange 3; the heat exchange tube 4 vertically penetrates through the shell 2, the middle heat exchange tube section 11 is arranged in the shell 2 to form a cooling heat exchange space, and the upstream tapered tube section 9, the downstream tapered tube section 10 and the elbow 5 are arranged outside the shell 2; the inlet and outlet ends of the housing 2 are each connected to a cooled fluid line via a cooled fluid connecting flange 1. The flow modes of the cooled fluid and the cooling working medium in the directions shown by the arrows in the figure 1 are distributed in a counter-flow manner on the whole, so that the heat exchange is enhanced.
Preferably, the heat exchange tubes 4 are serially arranged into a serpentine pipeline according to a single channel, the elbows 5 are adopted to connect the heat exchange tubes 4 end to end, the serpentine pipeline is formed by serially connecting, namely, the outlet of the upstream gradually-expanding tube section 9 and the inlet of the downstream gradually-reducing tube section 10 are connected by adopting the 180-degree elbows 5 to form serial arrangement, so that the length of the heat exchange tubes is prolonged, the heat exchange area is increased, and the heat exchange tubes are sequentially connected according to the heat exchange tube bundle array structure to ensure the compact structure of the heat exchanger.
Preferably, the intermediate heat exchange tube section 11 of the jet cooling heat exchanger disclosed in this embodiment 1 may be an equal-diameter heat exchange tube section or a gradually-expanding heat exchange tube section; referring to fig. 4, a cross-sectional view of the intermediate heat exchange tube segment 11 of the present invention is a constant diameter heat exchange tube segment, and the constant diameter heat exchange tube segment is configured for a working medium with weak compressibility; referring to fig. 5, a cross-sectional view of the intermediate heat exchange tube section 11 of the present invention is a schematic sectional view of a divergent heat exchange tube section, which is configured to deal with a working medium with a high compressibility.
Preferably, the outer walls of the upstream tapered pipe section 9, the intermediate heat exchange pipe section 11 and the downstream tapered pipe section 10 of the heat exchange pipe 4 are all of an equal-diameter structure, so that the processing and the installation are convenient, and the heat exchange pipe 4 and the shell 2 are fixed by welding. When the device is used, a working medium for cooling under pressure flows in from the upstream tapered pipe section 9, the speed is increased, the pressure is reduced, the temperature is reduced, the obtained low-temperature fluid enters the middle heat exchange pipe section 11 and exchanges heat with the cooled fluid in the shell 2, the internal energy is increased, the flow speed of the working medium is further increased, the obtained high-speed fluid flows in the downstream tapered pipe section 10, and then the high-temperature fluid under pressure is obtained by pressurizing, increasing the temperature and reducing the speed.
Preferably, metal fins are uniformly arranged on the outer wall of the middle heat exchange tube section 11 in the embodiment 1, so that heat exchange can be enhanced, the metal fins are fixedly connected with the heat exchange tube 4 in a welding mode and are arranged inside the shell 2, and the metal fins can be rectangular metal fins 7 or wavy metal fins 8; fig. 6 is a schematic structural view of a heat exchange tube bundle coupled with rectangular metal fins 7; fig. 7 is a schematic structural diagram of a heat exchange tube bundle coupled with the wavy metal fins 8.
Example 2
Fig. 2 is a schematic perspective view of the multi-channel parallel jet cooling heat exchanger of the jet cooling heat exchanger disclosed in this embodiment 2. Different from embodiment 1, the heat exchange tube bundle of the jet cooling heat exchanger disclosed in embodiment 2 is formed by arranging a plurality of heat exchange tubes 4 in parallel into a multi-channel, and a fluid distributor 6 is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange 3 and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange 3. The cooling working medium is uniformly distributed to each heat exchange tube 4 through the fluid distributor 6 and exchanges heat with the cooled fluid in the shell 2, and the cooling working medium after absorbing heat enters the fluid distributor 6 through the downstream divergent tube section 10 of the heat exchange tube 4 and flows out of the heat exchanger after being mixed.
Example 3
Fig. 3 is a schematic perspective view of a dual-channel series-parallel connection jet cooling heat exchanger of the jet cooling heat exchanger disclosed in this embodiment 3. Different from the embodiment 1, the heat exchange tube bundle of the jet cooling heat exchanger disclosed in the embodiment 3 is formed by arranging two layers of serpentine pipes in parallel to form a plurality of runners, and each layer of serpentine pipe is formed by connecting a plurality of heat exchange tubes 4 end to end through an elbow 5; and a fluid distributor 6 is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange 3 and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange 3. The cooling working medium is uniformly distributed into two layers of serpentine pipelines through the fluid distributor 6, exchanges heat with the cooled fluid in the shell 2, enters the fluid distributor 6 through the downstream divergent pipe section 10 of the heat exchange pipe 4 after exchanging heat, and flows out of the heat exchanger after being mixed. When the heat exchanger is used, a multilayer serpentine pipeline can be designed according to actual heat exchange requirements.
The working principle of the jet flow cooling heat exchanger disclosed by the invention is as follows:
the working medium with pressure enters the heat exchange tube of the jet cooler, the working medium expands in the upstream convergent tube section to reduce the pressure, the temperature and the speed and reach the sonic speed, and the temperature of the working medium is only related to the pressure and the temperature when the working medium enters the heat exchanger; then the high-speed and low-temperature working medium enters the middle heat exchange tube section to absorb heat to generate cold energy, and the pressure of the high-speed working medium is gradually increased under the actions of the friction of the wall surface of the pipeline and the heat absorption of the working medium; and finally, the working medium enters a downstream divergent pipe section for speed reduction and pressure increase, and kinetic energy is further converted into pressure energy, so that energy conservation is realized.
The low-temperature of the jet flow cooling heat exchanger disclosed by the invention is determined by working medium working conditions, and the pressure and the temperature of the working medium entering the jet flow cooling heat exchanger are adjusted in an external system through processes such as a compressor, a valve, heat exchange and the like, so that the required cooling temperature can be directly and quickly obtained in the middle heat exchange pipe section of the heat exchanger, and the refrigerating temperature is convenient and controllable; the pressurized fluid is expanded and cooled through the reducing pipe section, so that very low temperature can be obtained, the heat exchange temperature difference is increased, large heat flux density is obtained, the heat exchange area is reduced, and the heat exchange capacity per unit volume is high. The speed of the cooling working medium is increased after heat absorption, partial absorbed heat can be converted into pressure energy, low-temperature heat utilization is realized, and the pressure drop of the heat exchanger is reduced; can be used for recovering cold energy generated by residual pressure in industrial fluid; and when the evaporator is used in an air conditioning system, a throttle valve is not adopted, so that the refrigeration efficiency is improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A jet flow cooling heat exchanger is characterized by comprising a shell (2) and a plurality of heat exchange tubes (4);
the heat exchange tubes (4) are arranged in an array to form a heat exchange tube bundle, and each heat exchange tube (4) comprises an upstream gradually-reduced tube section (9), a middle heat exchange tube section (11) and a downstream gradually-expanded tube section (10);
the heat exchange tube bundle is arranged across the shell (2), the middle heat exchange tube sections (11) of all the heat exchange tubes (4) are arranged in the shell (2), and the upstream tapered tube section (9) and the downstream tapered tube section (10) are arranged outside the shell (2);
the working medium inlet end and the working medium outlet end of the heat exchange tube bundle are respectively connected with a cooling working medium pipeline;
and the working medium inlet end and the working medium outlet end of the shell (2) are respectively connected with a cooled fluid pipeline.
2. The jet cooling heat exchanger according to claim 1, characterized in that the heat exchange tube bundle is formed by connecting a plurality of heat exchange tubes (4) end to end in series into a serpentine tube by means of elbows (5).
3. The jet cooling heat exchanger according to claim 1, characterized in that the bundle is multi-channeled with a plurality of heat exchanger tubes (4) arranged in parallel, and a fluid distributor (6) is arranged between the inlet end of the bundle and the cooling medium connecting flange (3) and between the outlet end of the bundle and the cooling medium connecting flange (3), respectively.
4. The jet cooling heat exchanger according to claim 1, characterized in that the heat exchange tube bundle is arranged in parallel into a multi-channel by a plurality of layers of serpentine tubes, each layer of serpentine tubes is formed by connecting a plurality of heat exchange tubes (4) end to end by bends (5); and a fluid distributor (6) is respectively arranged between the inlet end of the heat exchange tube bundle and the cooling working medium connecting flange (3) and between the outlet end of the heat exchange tube bundle and the cooling working medium connecting flange (3).
5. The jet cooling heat exchanger according to claim 1, characterized in that the outer wall of the intermediate heat exchange tube section (11) is provided with metal fins.
6. The jet cooling heat exchanger according to claim 5, characterized in that the metal fins are rectangular metal fins (7) or corrugated metal fins (8).
7. The jet cooling heat exchanger according to claim 5, characterized in that the metal fins are fixedly connected with the heat exchange tube (4) by means of welding or tube expansion.
8. The jet cooling heat exchanger according to claim 1, characterized in that the intermediate heat exchange tube section (11) is a constant diameter or a divergent heat exchange tube section.
9. The jet cooling heat exchanger according to claims 1-8, characterized in that the working medium inlet end and the working medium outlet end of the heat exchange tube bundle are connected with a cooling working medium pipeline through a cooling working medium connecting flange (3), respectively; the working medium inlet end and the working medium outlet end of the shell (2) are respectively connected with a cooled fluid pipeline through a cooled fluid connecting flange (1).
10. The jet cooling heat exchanger according to claims 1 to 8, characterized in that the heat exchange tubes (4) are fixed to the shell (2) by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211348699.1A CN115789999A (en) | 2022-10-31 | 2022-10-31 | Jet cooling heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211348699.1A CN115789999A (en) | 2022-10-31 | 2022-10-31 | Jet cooling heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115789999A true CN115789999A (en) | 2023-03-14 |
Family
ID=85434584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211348699.1A Pending CN115789999A (en) | 2022-10-31 | 2022-10-31 | Jet cooling heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115789999A (en) |
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2022
- 2022-10-31 CN CN202211348699.1A patent/CN115789999A/en active Pending
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