CN106705270B

CN106705270B - Heat exchanger

Info

Publication number: CN106705270B
Application number: CN201510769832.4A
Authority: CN
Inventors: 董洪洲
Original assignee: Zhejiang Dunan Artificial Environment Co Ltd
Current assignee: Zhejiang Dunan Artificial Environment Co Ltd
Priority date: 2015-11-12
Filing date: 2015-11-12
Publication date: 2020-07-17
Anticipated expiration: 2035-11-12
Also published as: CN106705270A

Abstract

The invention provides a heat exchanger. This heat exchanger includes a plurality of fins (1) and sets up flat pipe (3) in mounting groove (2) between adjacent fin (1), and fin (1) is including heat transfer portion (4), is provided with a plurality of structures of windowing (5) on heat transfer portion (4), along the flow direction of air, in the back half section of heat transfer portion (4), the height of the flat portion (7) that forms between structure of windowing (5) and flat pipe (3) of its downside increases progressively, and the height of structure of windowing (5) decreases progressively. According to the heat exchanger disclosed by the invention, the defect that the defrosting time is increased due to the accumulation of condensed water in the heat exchanger in the prior art can be solved.

Description

Heat exchanger

Technical Field

The invention relates to the technical field of refrigeration air conditioners, in particular to a heat exchanger.

Background

An outdoor heat exchanger for exchanging heat between refrigerant and outdoor air is provided in a refrigerant circuit of an air conditioner. The outdoor heat exchanger functions as an evaporator during a heating operation of the air conditioner. If the refrigerant evaporating temperature in the outdoor heat exchanger is lower than 0 c, moisture in the air is frosted (i.e., frozen) and adheres to the outdoor heat exchanger. Therefore, during the heating operation in a state where the outdoor air temperature is low, the defrosting operation for melting the frost adhering to the outdoor heat exchanger is performed every predetermined time. During the defrosting operation, the high-temperature refrigerant is supplied to the outdoor heat exchanger, and frost adhering to the outdoor heat exchanger is heated and melted by the refrigerant. As a result, the frost adhering to the outdoor heat exchanger is melted into condensed water and discharged from the outdoor heat exchanger.

On the other hand, a heat exchanger in which flat tubes are arranged vertically can be used as an outdoor heat exchanger of an air conditioner. However, in this heat exchanger, since the flat side surfaces of the flat tubes face upward, condensed water is likely to accumulate on the flat tubes. In particular, when a plurality of louver portions are formed on the surface of the fin, condensed water enters and is stored between the elongated slits formed by cutting the louver portions. If the condensed water is accumulated around the fins as described above, the condensed water may prevent the transfer of the hot refrigerant to the frost, and the time required to completely melt the frost may increase.

Disclosure of Invention

The invention aims to solve the defect that the defrosting time is increased due to the accumulation of condensed water in the heat exchanger in the prior art, and provides the heat exchanger.

In order to achieve the technical purpose, the invention provides a heat exchanger which comprises a plurality of fins and flat pipes arranged in installation grooves between the adjacent fins, wherein each fin comprises a heat transfer part, a plurality of window structures are arranged on the heat transfer parts, the height of a flat part formed between each window structure and the flat pipe on the lower side of the window structure is gradually increased along the flowing direction of air in the rear half section of each heat transfer part, and the height of each window structure is gradually decreased.

In the heat exchanger provided by the invention, the height of the flat part formed between the windowing structure and the flat pipe on the lower side of the windowing structure is gradually increased in the rear half section of the heat transfer part, and the area of the flat part is gradually increased along the flow direction of air, so that condensed water gradually accumulated along the flow direction of air can be timely drained away through the flat part with the gradually increased area, the phenomenon that the condensed water is accumulated in large quantity to block the heat self-refrigerant from transferring to frost is avoided, the defrosting efficiency is improved, and the defrosting time is shortened.

Drawings

FIG. 1 is a partial block diagram of a heat exchanger according to a first embodiment of the present invention;

FIG. 2 is a partial block diagram of a heat exchanger according to a second embodiment of the present invention;

FIG. 3 is a schematic view of a fenestration of a heat exchanger in accordance with a first embodiment of the invention;

FIG. 4 is a schematic view of a fenestration of a heat exchanger in accordance with a second embodiment of the invention;

FIG. 5 is a structural view of the flange of the heat exchanger of the embodiment of the present invention; and

fig. 6 is a perspective view of the heat exchanger according to the embodiment of the present invention.

Description of reference numerals: 1. a fin; 2. mounting grooves; 3. flat tubes; 4. a heat transfer portion; 5. a windowing structure; 6. an arc-shaped guide part; 7. a flat portion; 8. a leeward side plate; 9. a vertical rib; 10. a connecting rib; 11. a rising part; 12. and (5) flanging.

Detailed Description

The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.

Referring to fig. 1 to 6, the present invention provides a heat exchanger, including a plurality of fins 1 and flat tubes 3 disposed in mounting grooves 2 between adjacent fins 1, the fins 1 include heat transfer portions 4, the heat transfer portions 4 are provided with a plurality of window structures 5, in the rear half section of the heat transfer portion 4 along the flow direction of air, the height of a flat portion 7 formed between the window structure 5 and the flat tube 3 on the lower side thereof increases progressively, and the height of the window structure 5 decreases progressively.

In the heat exchanger of the invention, because the height of the flat part 7 formed between the windowing structure 5 and the flat pipe 3 at the lower side of the windowing structure is gradually increased in the rear half section of the heat transfer part 4, the area of the flat part 7 in unit length is gradually increased along the flowing direction of air, so that the condensed water gradually accumulated along the flowing direction of air can be timely drained through the flat part 7 with the gradually increased area between the windowing structure 5 and the flat pipe 3 at the lower side of the windowing structure, thereby avoiding the phenomenon that the condensed water is accumulated in large quantity to block the transmission of the hot self-refrigerant to frost, improving the defrosting efficiency and shortening the defrosting time.

The height of the flat portion 7 between the window structure 5 and the flat tube 3 on the upper side thereof in the flow direction of the air remains unchanged, since the flat portion 7 here has no influence on the drainage of the condensed water, and therefore no change needs to be made to the flat portion 7 here.

The length direction of the windowing structure 5 is crossed with the flowing direction of the air, so that the air can fully exchange heat through the windowing structure 5 in the flowing process, and the heat exchange efficiency of the heat exchanger is improved. In the present embodiment, the louver structure 5 is a louver structure, and the plurality of louver structures 5 are arranged at intervals in the flow direction of the air.

Referring to fig. 1 in combination, according to a first embodiment of the heat exchanger of the present invention, the height of the fenestration 5 increases in the first half of the heat transfer portion 4 in the direction of flow of the air. In the present embodiment, in the first half, the height of the windward side opening window of the heat transfer portion 4 is smaller than the height of the leeward side opening window, the height of the flat portion between the window structure 5 and the flat tubes 3 on the upper and lower sides decreases along the air flow direction, and the height of the flat portion between the window structure 5 and the flat tubes 3 on the upper side decreases. In the second half, the height of the upper wind side window of the heat transfer portion 4 is greater than the height of the lower wind side window, the height of the flat portion between the window structure and the flat tube 3 on the lower side increases from the upper wind side toward the lower wind side, and the height of the flat portion between the window structure and the flat tube 3 on the upper side is the same.

On the narrow air passage of rectangle that flat pipe 3 and fin 1 constitute, the air cooling that is close to flat pipe 3 is faster, therefore the air that is close to flat pipe 3 is faster more forms the comdenstion water.

Under the refrigeration working condition, the indoor dry bulb temperature is 27 ℃, and the indoor wet bulb temperature is 19 ℃. After the temperature of the humid air flowing through the indoor heat exchanger is reduced to about 15 ℃, water begins to condense. Wherein the water condensed at 15-5 ℃ accounts for about 75% of the total condensed water.

The condensed water formed by the wet air exists in the form of water mist in the air before being adsorbed by the solid surface such as the fin 1 and continues to drift with the wind until being adsorbed by touching the fin 1 or the water film.

Because the temperature difference close to the air inlet is large, the heat exchange amount is large, and therefore the air close to the air inlet can quickly and more form condensed water.

Therefore, the height of the windowing structure 5 at the air inlet can be reduced, the height of a large flat part is reserved between the windowing structure 5 and the flat pipes 3 on the upper side and the lower side, the probability that the water mist meets the fins 1 is reduced, and the water mist continuously floats to the leeward side and is adsorbed by the fins 1 or the water film. Along the structure of windowing 5 that the air flow direction height increases progressively, can guarantee the high minimum of fin 1 of inlet opening department, the probability that the water smoke is adsorbed is minimum, consequently can reduce the probability that humid air forms the comdenstion water in inlet opening department, avoids the water film of windward side or frost layer thickness to increase at the excessive speed, improves the whole heat transfer volume of heat exchanger.

The window opening angle of the window structure 5 located at the front half section of the heat transfer portion 4 increases in the flow direction of the air.

In the first half section of heat transfer portion 4, the upwind side angle of windowing of structure of windowing 5 is less than downwind side angle of windowing, and the angle of windowing is crescent from the upwind side to the downwind side, can reduce the probability that the fin was touched to the water smoke equally for water smoke continues to drift to the downwind side and just is adsorbed by fin or water film.

The window opening angle of the window opening structure 5 at the rear half section of the heat transfer part 4 has two different structures, the first structure is as shown in figure 3, and the window opening angle is increased progressively along the air flowing direction as well as the first half section; second, as shown in fig. 4, unlike the first half, in this embodiment, the window angle of the second half is not changed in the air flow direction, and the opening of the window structure of the second half faces opposite to the first half. For the first structure, after entering from the windowing structure 5, the air always flows along the gap between the two adjacent fins 1 according to the guiding of the windowing structure 5, and for the second structure, after entering from the windowing structure 5, the air flows for a distance along the gap between the two adjacent fins 1 according to the guiding of the windowing structure 5 in the first half section, and then flows back to the original path to continue to advance through the guiding of the windowing structure 5 in the second half section.

In the case of an outdoor heat exchanger used in a heating operation, when the temperature of air passing between fins of the heat exchanger is lower than 0 c, moisture in the air is condensed into water drops or ice particles, i.e., fog or frost. However, water droplets or ice particles continue to drift to the leeward side, and do not adhere to the heat exchanger until they hit fins, tube walls, a water film or a frost layer.

Therefore, by adopting the structure, the thickness of the water film or the frost layer on the upwind side is increased and decreased, and the thickness of the water film or the frost layer on the downwind side is increased and increased, so that the thickness increasing speed of the water film or the frost layer on the surface of the whole heat exchanger tends to be uniform, the whole heat exchange quantity is improved, and the frosting period is prolonged.

The structure of windowing 5 inclines for the vertical direction, and the lower extreme of structure of windowing 5 is closer to the leeward side than the upper end of structure of windowing 5, and the inclination of structure of windowing 5 of telling is between 10 degrees to 30 degrees for the comdenstion water that is located on the fin can flow out through the inclined structure of windowing 5 rapidly, can not gather in structure of windowing 5 department, has avoided the comdenstion water to cause the hindrance to the heat transfer of structure of windowing 5 departments, improves the heat exchange efficiency of structure of windowing 5 departments.

The opening of mounting groove 2 is located the windward side for the entry of mounting groove 2 can not cause the hindrance to air flow, can improve the flow efficiency of air. An opening of the mounting groove 2 is provided with an arc-shaped guide part 6. The arc guide part can form the guide effect to the installation of flat pipe 3, improves flat pipe 3's installation effectiveness.

The tail ends of the heat transfer parts 4 are connected to form a leeward side plate 8 along the air flowing direction, and a plurality of vertical ribs 9 extending along the length direction of the leeward side plate 8 are arranged on the leeward side plate 8. Vertical rib 9 can strengthen leeward curb plate 8's structural strength, and then strengthens the structural strength of whole fin 1.

The fin at the tail end of the flat pipe 3 comprises a connecting rib 10 which is horizontally or obliquely arranged and is connected to the vertical rib 9. The connecting ribs can guide the condensed water flowing down from the flat part 7, and meanwhile, the structural strength of the fin at the tail end of the flat pipe 3 can be enhanced.

The fin 1 is cut with a rising portion 11 rising up with respect to the fin 1, the tip of the rising portion 11 is in contact with the adjacent fin 1, and the upper surface of the rising portion 11 is inclined with respect to the horizontal plane. The rising portion 11 can secure a predetermined interval between two adjacent fins 1, and facilitates mounting and positioning of the fins 1. The upper surface of the rising portion 11 is inclined with respect to the horizontal plane, so that the condensed water on the upper surface of the rising portion 11 can flow downward quickly, and the condensed water accumulation can be avoided. Preferably, two standing portions 11 are provided on diagonal sides of the fins 1, respectively, so that positioning between adjacent fins 1 is more stable and reliable.

The bottom of the fin 1 is provided with a flanging 12, the section formed by the flanging 12 and the fin 1 is C-shaped, the flanging 12 extends from the windward side to the leeward side of the heat transfer part 4, and the height of the flanging 12 increases progressively along the flowing direction of air. At the leeward side, the arc section formed by clinging to the end part of the flat pipe continues to be flanged for about 30 degrees, and condensed water can be guided to flow to the leeward side plate 8 by utilizing the capillary action, so that the condensed water can be discharged in time.

Preferably, the distance between the flanging 12 and the fin 1 where the flanging is located is half of the distance between the adjacent fins 1, so that the flanging 12 and the fin 1 are prevented from interfering with each other while the condensate water is ensured to be discharged quickly.

Referring collectively to fig. 2, a second embodiment of a heat exchanger according to the present invention is substantially the same as the first embodiment except that in the present embodiment, the height of the louver structure 5 is decreased over the entire heat transfer portion 4 in the flow direction of the air. The structure can ensure that the area of the flat part 7 is increased along with the increase of the condensed water all the time, and can ensure the timely discharge of the condensed water.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The heat exchanger is characterized by comprising a plurality of fins (1) and flat pipes (3) arranged in installation grooves (2) between the adjacent fins (1), wherein each fin (1) comprises a heat transfer part (4), a plurality of windowing structures (5) are arranged on the heat transfer part (4), the rear half section of each heat transfer part (4) is arranged along the flowing direction of air, the heights of flat parts (7) formed between the flat pipes (3) of the windowing structures (5) and the lower sides of the windowing structures (5) are gradually increased, and the heights of the windowing structures (5) are gradually decreased.

2. The heat exchanger according to claim 1, characterized in that the height of the window structure (5) increases in the first half of the heat transfer portion (4) in the flow direction of the air; or the height of the windowing structure (5) decreases over the entire heat transfer part (4) in the direction of flow of the air.

3. The heat exchanger according to claim 1, characterized in that the opening angle of the opening structure (5) located in the front half of the heat transfer portion (4) increases in the flow direction of the air.

4. The heat exchanger according to claim 1, characterized in that the windowing structure (5) is inclined with respect to the vertical, and the lower end of the windowing structure (5) is closer to the leeward side than the upper end of the windowing structure (5), and the angle of inclination of the windowing structure (5) is between 10 and 30 degrees.

5. A heat exchanger according to claim 1, characterised in that the opening of the mounting groove (2) is located on the upwind side.

6. The heat exchanger according to claim 5, characterized in that the opening of the mounting groove (2) is provided with an arc-shaped guide (6).

7. The heat exchanger according to claim 1, wherein the ends of a plurality of the heat transfer portions (4) are connected to form a leeward side plate (8) in the air flow direction, and a plurality of vertical ribs (9) extending in the length direction of the leeward side plate (8) are provided on the leeward side plate (8).

8. The heat exchanger according to claim 7, characterized in that the fins (1) at the ends of the flat tubes (3) comprise horizontally or obliquely arranged connecting ribs (10), and the connecting ribs (10) are connected to the vertical ribs (9).

9. The heat exchanger according to claim 1, wherein a rising portion (11) rising with respect to the fin (1) is cut out from the fin (1), a tip of the rising portion (11) is in contact with the adjacent fin (1), and a surface of the rising portion (11) is provided obliquely with respect to a horizontal plane.

10. The heat exchanger according to claim 1, characterized in that the bottom of the fin (1) is provided with a turned-up edge (12), the turned-up edge (12) and the fin (1) form a C-shaped cross section, the turned-up edge (12) extends from the windward side to the leeward side of the heat transfer portion (4), and the height of the turned-up edge (12) increases in the flow direction of the air.