CN213066174U

CN213066174U - Heat exchanger

Info

Publication number: CN213066174U
Application number: CN202021199961.7U
Authority: CN
Inventors: 韩品连; 张坤; 丁振军
Original assignee: Shenzhen Yidong Aviation Technology Co Ltd
Current assignee: Shenzhen Yidong Aviation Technology Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-04-27
Anticipated expiration: 2030-06-24

Abstract

The utility model discloses a heat exchanger belongs to indirect heating equipment technical field, first annular structure including heat transfer main part and two relative settings, the heat transfer main part includes that a plurality of heliciform that are distribute and all connect the heat exchange tube between two first annular structures, the heat exchange tube includes the outer tube and sets up the inner tube in the outer tube, form first fluid runner between inner tube and the outer tube, the inner tube forms the second fluid runner, first passageway and second passageway all have in every first annular structure, every first passageway all feeds through in a plurality of first fluid runners, every second passageway all feeds through in a plurality of second fluid runners. The utility model provides a heat exchanger, heat transfer main part include a plurality of bolt form connection in the heat exchange tube between two first ring structures, not only can increase heat transfer area, can strengthen the torrent effect of fluid in the heat exchange tube moreover to improve heat exchange efficiency. And a plurality of heat exchange tubes are arranged in a bolt shape, so that the volume of the heat exchanger can be reduced, and the structure is simple.

Description

Heat exchanger

Technical Field

The utility model relates to a indirect heating equipment technical field especially relates to a heat exchanger.

Background

A micro-combustion engine is a turbine engine in the form of a back-flow combustor, which typically includes three major parts, a compressor, a combustor and a turbine. Usually, a heat exchanger is arranged outside a combustion chamber of the micro combustion engine, and the heat exchanger is used for preheating intake air and reducing exhaust temperature, reducing emission of nitrogen oxides and simultaneously improving thermal efficiency of the turbine engine.

At present, a heat exchanger applied to a micro-gas turbine is generally formed by stacking a plurality of spaced or nested heat exchange units, and has the disadvantages of complex structure, large volume and low heat exchange efficiency. In order to improve the heat exchange efficiency, the heat exchange efficiency is generally realized by increasing the number of stacked heat exchange units, which increases the volume and weight of the heat exchanger, which obviously does not meet the use requirement of a micro-combustion engine.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heat exchanger to solve the problem that the structure is complicated, heat exchange efficiency is low that the heat exchanger that exists among the prior art exists.

As the conception, the utility model adopts the technical proposal that:

the utility model provides a heat exchanger, includes heat transfer main part and two relative first ring structures that set up, the heat transfer main part includes that a plurality of heliciform that are distributes and connect in two heat exchange tube between the first ring structure, the heat exchange tube include the outer tube with set up in inner tube in the outer tube, the inner tube with form first fluid runner between the outer tube, the inner tube forms the second fluid runner, every all have first passageway and second passageway in the first ring structure, every the first passageway all communicates in a plurality of first fluid runner, every the second passageway all communicates in a plurality of the second fluid runner.

Furthermore, the heat exchange tube also comprises a heat exchange structure, the heat exchange structure comprises a plurality of heat exchange fins arranged along the circumferential direction of the inner tube at intervals, one part of the heat exchange fins is positioned in the second fluid flow channel, and the other part of the heat exchange fins is positioned in the first fluid flow channel.

Further, the heat exchange fins are arc-shaped fins.

Further, the thickness of the heat exchange fin is 0.3 mm.

Further, the radial cross sections of the outer pipe and the inner pipe are both elliptical ring-shaped cross sections.

Further, the wall thickness of the outer pipe and the wall thickness of the inner pipe are both 0.3 mm.

Furthermore, the heat exchanger further comprises two second annular structures which are arranged oppositely, the two first annular structures are located between the two second annular structures, each second annular structure is provided with a third channel, and each third channel is connected to the corresponding second channel.

Furthermore, a hot fluid inlet and a hot fluid outlet are respectively formed in the two first annular structures, and the hot fluid inlet and the hot fluid outlet are respectively communicated with the corresponding first channels; and the two second annular structures are respectively provided with a cold fluid inlet and a cold fluid outlet, the cold fluid inlet and the cold fluid outlet are respectively communicated with the corresponding third channels, and the hot fluid inlet and the cold fluid outlet are positioned on the same axial side of the heat exchange main body.

Further, the heat exchange main body, the two first annular structures and the two second annular structures are integrally formed.

The utility model has the advantages that:

the utility model provides a heat exchanger, heat transfer main part include a plurality of bolt form distributions and all connect the heat exchange tube between two first ring structures, not only can increase heat transfer area, can strengthen the torrent effect of fluid in the heat exchange tube moreover to improve heat exchange efficiency. And a plurality of heat exchange tubes are arranged in a bolt shape, so that the volume of the heat exchanger can be reduced, and the structure is simple.

Drawings

Fig. 1 is a schematic structural diagram of a first view angle of a heat exchanger provided by the present invention;

fig. 2 is a schematic structural diagram of a second view angle of the heat exchanger provided by the present invention;

fig. 3 is a schematic cross-sectional view of a heat exchanger provided by the present invention;

fig. 4 is a partially enlarged schematic view at a in fig. 3.

In the figure:

1. a first cyclic structure; 101. a hot fluid inlet; 11. a connecting pipe;

2. a heat exchange body; 21. a heat exchange pipe; 211. an outer tube; 212. an inner tube; 213. heat exchange fins; 201. a first fluid flow path; 202. a second fluid flow passage;

3. a second annular structure; 301. a cold fluid inlet; 302. and a cold fluid outlet.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 to 4, the present embodiment provides a heat exchanger, which is mainly used for exchanging heat between the inlet and outlet gases of a micro combustion engine, so as to preheat the inlet gas and reduce the temperature of the outlet gas, thereby reducing the emission of nitrogen oxides and reducing the pollution to the environment. Of course, the heat exchanger can also be used in other occasions with heat exchange requirements, and is not particularly limited herein.

In particular, the heat exchanger comprises a heat exchange body 2 and two oppositely arranged first ring structures 1. The heat exchange body 2 comprises a plurality of heat exchange tubes 21 which are distributed spirally and connected between the two first annular structures 1, each heat exchange tube 21 comprises an outer tube 211 and an inner tube 212 arranged in the outer tube 211, a first fluid flow channel 201 is formed between the inner tube 212 and the outer tube 211, a second fluid flow channel 202 is formed by the inner tube 212, a first channel and a second channel are arranged in each first annular structure 1, each first channel is communicated with the plurality of first fluid flow channels 201, and each second channel is communicated with the plurality of second fluid flow channels 202.

It can be understood that the heat exchange main body 2 comprises a plurality of heat exchange tubes 21 which are distributed spirally and are connected between the two first annular structures 1, so that the heat exchange area can be increased, and the turbulence degree of fluid in the heat exchange tubes 21 can be increased, and the heat exchanger has high heat exchange efficiency, simple structure and small volume.

As shown in fig. 1 and 2, the heat exchanger further includes two oppositely disposed second annular structures 3, two first annular structures 1 are located between the two second annular structures 3, each second annular structure 3 has a third channel, and each third channel is connected to a corresponding second channel. In the present embodiment, the heat exchange body 2, the two first annular structures 1, and the two second annular structures 3 constituting the heat exchanger are integrally formed. Specifically, the heat exchanger is integrally manufactured and molded by adopting a brightening, powder spreading and material increasing manufacturing technology, the laser powder spreading and material increasing manufacturing technology is also called as a laser 3D printing technology, and the heat exchanger has the characteristics of flexibility, easiness in realizing intellectualization, short production period, suitability for processing parts with complex structures, good mechanical properties of the produced parts and the like.

Further, a hot fluid inlet 101 and a hot fluid outlet are respectively formed in the two first annular structures 1, and the hot fluid inlet 101 and the hot fluid outlet are respectively communicated with the corresponding first channels; a cold fluid inlet 301 and a cold fluid outlet 302 are respectively formed in the two second annular structures 3, and the cold fluid inlet 301 and the cold fluid outlet 302 are respectively communicated with corresponding third channels. It is understood that the hot fluid inlet 101, the first channel in communication with the hot fluid inlet 101, the first fluid channel 201, the first channel in communication with the hot fluid outlet, and the hot fluid outlet form a hot fluid flow path. The cold fluid inlet 301, the third channel in communication with the cold fluid inlet 301, the second channel of one first annular structure 1, the second fluid channel 202, the second channel of the other first annular structure 1, the third channel in communication with the cold fluid outlet 302, and the cold fluid outlet 302 form a cold fluid channel. The cold fluid and the hot fluid are heat exchanged in the heat exchange tube 21 through the wall of the inner tube 212.

Further preferably, the hot fluid inlet 101 and the cold fluid outlet 302 are located on the same side of the heat exchange main body 2, it can be understood that the first annular structure 1 provided with the hot fluid outlet and the second annular structure 3 provided with the cold fluid outlet 302 are located on the same side of the heat exchange main body 2, the first annular structure 1 provided with the hot fluid inlet 101 and the second annular structure 3 provided with the cold fluid outlet 302 are located on the same side of the heat exchange main body 2, and at this time, the flowing directions of the cold fluid and the hot fluid in the heat exchange tube 21 are opposite, which is beneficial to further improving the heat exchange efficiency. In addition, the hot fluid flow passage can exchange heat again with the cold fluid flowing to the combustion chamber through the space formed by the plurality of heat exchange tubes 21, thereby further improving the heat exchange effect.

Further, the hot fluid inlets 101 and the hot fluid outlets are provided in a plurality, the hot fluid inlets 101 are communicated with the corresponding first channels, and the hot fluid outlets are communicated with the corresponding first channels. Furthermore, the heat exchanger comprises a plurality of connecting pipes 11, each connecting pipe 11 being connected to one hot fluid outlet. The cold fluid inlets 301 and the cold fluid outlets 302 are respectively provided with a plurality of cold fluid inlets 301, the cold fluid inlets 301 are respectively communicated with the corresponding third channels, and the cold fluid outlets 302 are respectively communicated with the corresponding third channels. Through the setting, the complication of the flow state of cold fluid when flowing in the cold fluid channel can be further enhanced, the complication of the flow state of hot fluid when flowing in the hot fluid channel is further enhanced, and the heat exchange efficiency is improved.

Further, in the present embodiment, the radial cross sections of the first annular structure 1 and the second annular structure 3 are both elliptical ring-shaped cross sections. Specifically, the major axis of the ellipse formed by the inner wall of the radial cross section of the first annular structure 1 is 18mm and the minor axis thereof is 10mm, and the major axis of the ellipse formed by the inner wall of the radial cross section of the second annular structure 3 is 12.4mm and the minor axis thereof is 4.4 mm. Of course, in other embodiments, the structures of the first annular structure 1 and the second annular structure 3 may be set according to actual needs, for example, the radial cross sections of the first annular structure 1 and the second annular structure 3 may also be circular cross sections.

As shown in fig. 3 and 4, the heat exchange tube 21 further includes a heat exchange structure, the heat exchange structure includes a plurality of heat exchange fins 213 arranged at intervals along the circumferential direction of the inner tube 212, and a part of the heat exchange fins 213 is located in the second fluid flow channel 202, and another part is located in the first fluid flow channel 201. By providing the heat exchange fins 213, not only the heat exchange area can be increased, but also the turbulence degree of the fluid in the first fluid flow channel 201 and the second fluid flow channel 202 can be further increased, thereby improving the heat exchange efficiency. Further, the heat exchange fins 213 are arc-shaped fins, and the heat exchange area can be increased compared to flat plate fins, with the same length in the radial direction of the inner tube 212. In addition, further preferably, in this embodiment, the thickness of the heat exchange fin 213 is 0.3mm, which not only can ensure that the heat exchange fin 213 has sufficient strength, but also can make the thickness of the heat exchange fin 213 relatively thin, thereby improving the heat exchange effect.

It should be noted that in this embodiment, the heat exchange fins 213 are added to the inner tube 212 only to enhance the heat exchange effect, but in other embodiments, the heat exchange effect may also be enhanced by changing the helical pitch of the plurality of heat exchange tubes 21 of the heat exchange main body 2, or changing the structures of the inner tube 212 and the outer tube 211, or providing the concave-convex structures for enhancing turbulence on both the inner tube 212 and the outer tube 211.

Further, in the present embodiment, both the radial cross sections of the outer tube 211 and the inner tube 212 are elliptical ring-shaped cross sections. Of course, in other embodiments, the radial cross-sections of the outer tube 211 and the inner tube 212 may also be circular cross-sections, rectangular ring cross-sections, and the like. Further, in the present embodiment, the major axis of the ellipse formed by the inner wall of the radial cross section of the outer tube 211 is 18mm, and the minor axis is 10 mm. The inner wall of the radial section of inner tube 212 forms an ellipse having a major axis of 12.4mm and a minor axis of 4.4 mm. In addition, in this embodiment, the wall thickness of inner tube 212 and outer tube 211 is 0.3mm, can guarantee to have sufficient structural strength, can improve the heat transfer effect again. In other embodiments, the thickness of the inner tube 212, the thickness of the outer tube 211, the shape of the inner tube 212, and the shape of the outer tube 211 may be set as needed.

In conclusion, the heat exchanger that this embodiment provided, heat exchange body 2 include a plurality of bolt forms respectively and all connect in the heat exchange tube 21 between two first loop configuration 1, not only can increase heat transfer area, can strengthen the torrent effect of fluid in heat exchange tube 21 moreover to improve heat exchange efficiency. In addition, the heat exchanger has a simple structure, and the plurality of heat exchange tubes 21 are arranged in a bolt shape, so that the volume of the heat exchanger can be reduced.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The heat exchanger is characterized by comprising a heat exchange body (2) and two oppositely arranged first annular structures (1), wherein the heat exchange body (2) comprises a plurality of heat exchange tubes (21) which are distributed spirally and are connected between the two first annular structures (1), each heat exchange tube (21) comprises an outer tube (211) and an inner tube (212) arranged in the outer tube (211), a first fluid flow channel (201) is formed between each inner tube (212) and the outer tube (211), a second fluid flow channel (202) is formed between each inner tube (212), each first annular structure (1) is internally provided with a first channel and a second channel, each first channel is communicated with the plurality of first fluid flow channels (201), and each second channel is communicated with the plurality of second fluid flow channels (202).

2. The heat exchanger of claim 1, wherein the heat exchange tubes (21) further comprise a heat exchange structure comprising a plurality of heat exchange fins (213) spaced circumferentially about the inner tube (212), the heat exchange fins (213) being partially disposed within the second fluid flow channel (202) and partially disposed within the first fluid flow channel (201).

3. The heat exchanger according to claim 2, wherein the heat exchanging fins (213) are arc-shaped fins.

4. A heat exchanger according to claim 3, characterised in that the heat exchange fins (213) have a thickness of 0.3 mm.

5. The heat exchanger according to claim 2, characterized in that the radial sections of the outer tube (211) and the inner tube (212) are both elliptical-annular sections.

6. The heat exchanger according to claim 5, wherein the outer tube (211) and the inner tube (212) each have a wall thickness of 0.3 mm.

7. The heat exchanger according to claim 1, characterized in that it further comprises two oppositely arranged second annular structures (3), both first annular structures (1) being located between the two second annular structures (3), each second annular structure (3) having a third passage, each third passage being connected to a corresponding second passage.

8. The heat exchanger according to claim 7, characterized in that two first ring structures (1) are respectively provided with a hot fluid inlet (101) and a hot fluid outlet, and the hot fluid inlet (101) and the hot fluid outlet are respectively communicated with the corresponding first channels; and cold fluid inlets (301) and cold fluid outlets (302) are respectively formed in the two second annular structures (3), the cold fluid inlets (301) and the cold fluid outlets (302) are respectively communicated with the corresponding third channels, and the hot fluid inlet (101) and the cold fluid outlet (302) are positioned on the same axial side of the heat exchange main body (2).

9. The heat exchanger according to claim 7, characterized in that the heat exchange body (2), the two first annular structures (1) and the two second annular structures (3) are integrally formed.