WO2020019636A1

WO2020019636A1 - Evaporator and air conditioning unit

Info

Publication number: WO2020019636A1
Application number: PCT/CN2018/121166
Authority: WO
Inventors: 王铁强; 胡东兵; 石群红; 陈增辉; 胡海利
Original assignee: 珠海格力电器股份有限公司
Priority date: 2018-07-25
Filing date: 2018-12-14
Publication date: 2020-01-30
Also published as: CN108844258B; CN108844258A

Abstract

Provided are an evaporator and an air conditioning unit. In the evaporator, a first group of heat exchange pipes (41) and a second group of heat exchange pipes (42) are provided inside a housing (10), and the second group of heat exchange pipes (42) are located below a liquid distributor (30). A first group of liquid equalizing pipes (51) are provided inside the housing (10) and are located between the first group of heat exchange pipes (41) and the second group of heat exchange pipes (42). The diameter of the heat exchange pipes of the first group of liquid equalizing pipes (51) is less than the diameter of the heat exchange pipes of the first group of heat exchange pipes (41). The distribution density of the heat exchange pipes of the first group of liquid equalizing pipes (51) is greater than the distribution density of the heat exchange pipes of the first group of heat exchange pipes (41).

Description

Evaporator and air-conditioning unit

This application is based on an application with a CN application number of CN201810829283.9 and an application date of July 25, 2018, and claims its priority. The disclosure of this CN application is incorporated herein as a whole.

Technical field

The present disclosure relates to the technical field of refrigeration equipment, and in particular, to an evaporator and an air-conditioning unit.

Background technique

In air-conditioning refrigeration systems, pressure vessels are the main components, such as evaporators, condensers, oil separators, flashers, etc. With the continuous development of technological level, products with higher heat exchange capacity have more advantages and competitiveness in the case of small price and cost differences. Through the research on heat exchange capacity, it is found that the evaporator has undergone significant technological changes. Currently, shell and tube heat exchangers have dry evaporators, full liquid evaporators, and falling film evaporators. From the perspective of the future, The development of the falling film evaporator is considerable, and it is developing rapidly in the industry.

However, there are still many technical bottlenecks in the falling film evaporator, and there is still great potential in the heat exchange capacity. The existing liquid dispenser structures have various structures and the structure is basically mature. However, the design of the liquid distributor structure alone can only guarantee the heat exchange uniformity in the upper area of the heat exchanger, and cannot cover the entire heat exchange area. Therefore, the design of the heat transfer structure of the falling film evaporator still needs to be improved.

Summary of the Invention

The embodiments of the present disclosure provide an evaporator and an air conditioning unit to solve the technical problem of low uniformity of heat exchange existing in the evaporator in the prior art.

An embodiment of the present application provides an evaporator, including: a housing; a liquid inlet and an air outlet provided on the housing; and a liquid distributor provided on an upper portion of the housing and corresponding to the liquid inlet, the liquid distribution The device is used to disperse the refrigerant passed through the liquid inlet; the first heat exchange tube group is arranged in the shell and is located below the liquid distributor; the second heat exchange tube group is arranged in the shell and is located in the first exchange Below the heat pipe group; the first liquid equalizing pipe group is disposed in the casing and is located between the first heat exchange tube group and the second heat exchange tube group. The diameter of the heat exchange tubes of a heat exchange tube group, and the distribution density of the heat exchange tubes of the first liquid equalization tube group are greater than the distribution density of the heat exchange tubes of the first heat exchange tube group.

In some embodiments, the evaporator further includes a second homogenizing tube group, and the second homogenizing tube group is disposed in the housing and is located between the liquid distributor and the first heat exchange tube group. The diameter of the heat exchange tube is smaller than that of the first heat exchange tube group, and the distribution density of the heat exchange tubes of the second homogenization tube group is greater than that of the first heat exchange tube group.

In some embodiments, the evaporator further includes a superheated heat exchange tube group. The superheated heat exchange tube group is disposed in a lower portion of the casing and is located below the second heat exchange tube group.

In some embodiments, the evaporator further includes a third homogenizing tube group, the third homogenizing tube group is disposed in the casing, and is located between the second heat exchanging tube group and the superheating heat exchanging tube group. The diameter of the heat exchange tube of the group is smaller than that of the superheated heat exchange tube group, and the distribution density of the heat exchange tube of the third homogenization tube group is greater than that of the superheated heat exchange tube group.

In some embodiments, the evaporator further includes a booster tube group. The booster tube group is disposed in the casing and is located below the superheated heat exchange tube group. The diameter of the heat transfer tube, the distribution density of the heat transfer tube of the synergistic tube group is greater than that of the superheated heat transfer tube group.

In some embodiments, the evaporator further includes a first drying tube group and a second drying tube group, and the first drying tube group and the second drying tube group are respectively distributed on two sides in the casing.

In some embodiments, the first heat exchange tube group, the second heat exchange tube group, and the superheated heat exchange tube group are distributed in the middle of the width direction of the casing.

In some embodiments, the first homogenizing tube component is two parts, the first part is close to the first heat exchange tube group, and the second part is close to the second heat exchange tube group.

In some embodiments, the evaporator is a falling film evaporator.

The application also provides an air-conditioning unit including an evaporator, and the evaporator is the above-mentioned evaporator.

In the above embodiment, after the refrigerant flows through the first heat exchange tube group, the refrigerant will fall on the first liquid equalization tube group. Due to the small diameter and large distribution density of the heat exchange tubes of the first homogenizing tube group, when the refrigerant flows through the first homogenizing tube group, it will be randomly distributed more evenly by the heat exchanging tubes of the first homogenizing tube group. , So that the refrigerant can be homogenized again, and the refrigerant can evenly fall on the second heat exchange tube group for heat exchange. In this way, the heat exchange uniformity of the evaporator is improved, and the overall heat exchange efficiency is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings constituting a part of this application are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure, and do not constitute an improper limitation on the present disclosure. In the drawings:

1 is a schematic cross-sectional structure diagram of Embodiment 1 of an evaporator according to the present disclosure;

FIG. 2 is a schematic cross-sectional structure diagram of a second embodiment of an evaporator according to the present disclosure.

detailed description

In order to make the objectives, technical solutions, and advantages of the present disclosure more clear, the present disclosure is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present disclosure and the description thereof are used to explain the present disclosure, but are not intended to limit the present disclosure.

It has been found that when the liquid refrigerant enters the casing 10 through the liquid inlet 21, it will be evenly distributed on the heat exchange tube group by the liquid distributor 30. As the liquid refrigerant is continuously evaporated on the heat exchange tube group. Affected by the gaseous refrigerant, the uniformity of the distribution of the liquid refrigerant will be worse, which will lead to the worsening of the heat transfer uniformity.

FIG. 1 illustrates a first embodiment of an evaporator of the present disclosure. The evaporator includes a casing 10, a liquid inlet 21 and an air outlet 22, and the liquid inlet 21 and the air outlet 22 are disposed on the casing 10. The evaporator further includes a liquid distributor 30, a first heat exchange tube group 41, a second heat exchange tube group 42 and a first liquid equalization tube group 51. The liquid distributor 30 is disposed on the upper portion of the casing 10 and communicates with the liquid inlet. Corresponding to the port 21, the liquid distributor 30 is used to disperse the refrigerant passed through the liquid inlet 21. The first heat exchange tube group 41 and the second heat exchange tube group 42 are disposed in the casing 10, and the second heat exchange tube group 42 is located below the liquid distributor 30. The first homogenizing tube group 51 is disposed in the casing 10 and is located between the first heat exchanging tube group 41 and the second heat exchanging tube group 42. The heat exchanging tube diameter of the first homogenizing tube group 51 is smaller than the first The diameter of the heat exchange tubes of the heat exchange tube group 41, and the distribution density of the heat exchange tubes of the first liquid homogeneous tube group 51 are greater than the distribution density of the heat exchange tubes of the first heat exchange tube group 41.

Applying the technical solution of the present disclosure, after the refrigerant flows through the first heat exchange tube group 41, the refrigerant will fall on the first homogenizing tube group 51. Due to the small diameter and large distribution density of the heat exchange tubes of the first homogenizing tube group 51, when the refrigerant flows through the first homogenizing tube group 51, it will be randomly distributed by the heat exchange tubes of the first homogenizing tube group 51. The ground is more uniform, so that the refrigerant can be homogenized again, and the refrigerant can evenly fall on the second heat exchange tube group 42 for heat exchange. In this way, the heat exchange uniformity of the evaporator is improved, and the overall heat exchange efficiency is improved.

Optionally, in the technical solution of this embodiment, the liquid inlet 21 and the air outlet 22 are provided on the top of the housing 10. As another optional implementation manner, the liquid inlet 21 and the air outlet 22 may also be provided. On the side of the casing 10.

It should be noted that both the homogenizing tube group and the heat exchange tube group are also composed of heat exchange tubes that can perform evaporative heat exchange.

As shown in FIG. 1, preferably, in the technical solution of the first embodiment, the evaporator further includes a superheated heat exchange tube group 60. The superheated heat exchange tube group 60 is disposed in the lower portion of the casing 10 and is located at the second heat exchange. Below the tube group 42. During the use of the evaporator, the refrigerant that has not been vaporized by the heat exchange tube group will accumulate in the lower part of the casing 10, and the superheated heat exchange tube group 60 located in the lower part of the casing 10 will exchange heat with this part of the refrigerant. This part of the refrigerant is also allowed to evaporate into a gaseous refrigerant.

During the use of the evaporator, the phenomenon of suction and liquidation occurs when the liquid refrigerant evaporates, which is not conducive to sufficient heat exchange. As shown in FIG. 1, as a preferred implementation manner, in the technical solution of the first embodiment, the evaporator further includes a booster tube group 70. The booster tube group 70 is disposed in the casing 10 and is located in the superheat heat exchanger. Below the tube group 60. The diameter of the heat exchange tubes of the booster tube group 70 is smaller than the diameter of the heat transfer tubes of the superheated tube group 60, and the density of the heat transfer tubes of the booster group 70 is greater than the density of the heat transfer tubes of the superheated tube group 60. The synergistic tube group 70 provided below the superheated tube group 60 can not only add an evaporation process to facilitate immersion heat exchange, but also because the tube diameter of the synergistic tube group 70 is small and the heat transfer tube has a high density. The characteristics can make the thickness of the liquid film on the synergy tube group 70 thinner than that of the superheated heat exchange tube group 60, and the space in the casing 10 can be used to arrange the heat exchange tubes more fully, so that the heat exchange tubes can be arranged to the maximum, saving The space occupied by the heat exchanger increases the heat exchange area and fully heat exchanges.

It should be noted that the booster tube group and the heat exchange tube group are also composed of heat exchange tubes that can perform evaporation heat exchange.

More preferably, the evaporator further includes a first drying tube group 81 and a second drying tube group 82, and the first drying tube group 81 and the second drying tube group 82 are respectively distributed on two sides in the casing 10. By arranging the first drying tube group 81 and the second drying tube group 82 on both sides of the casing 10, a drying process can be added to the airflow channel, so that the refrigerant is more fully gasified.

Optionally, in the technical solution of the first embodiment, as shown in FIG. 1, the first heat exchange tube group 41, the second heat exchange tube group 42, and the superheated heat exchange tube group 60 are distributed in the width direction of the casing 10. The middle. More preferably, the first heat exchange tube group 41 is located in the upper middle portion of the casing 10, and the second heat exchange tube group 42 is located in the lower middle portion of the casing 10. In this way, the space in the casing 10 can be used reasonably to arrange the heat exchange tubes.

When the technical solution of the first embodiment is used, after the liquid refrigerant enters the casing 10 through the liquid inlet 21, the liquid distributor 30 is evenly distributed on the first heat exchange tube group 41 for evaporation. The remaining liquid refrigerant drips from the first heat exchange tube group 41 to the first liquid equalization tube group 51. Through the first liquid equalization tube group 51, the refrigerant can be evaporated and distributed more evenly. The refrigerant will drip on the second heat exchange tube group 42 for evaporation, and the remaining refrigerant drops will be collected on the lower part of the casing 10 and evaporated by the superheated heat exchange tube group 60 and the efficiency tube group 70, and at the same time, the efficiency will be increased. The tube group 70 also prevents the refrigerant in the lower portion of the casing 10 from being sucked and liquid. The first drying tube group 81 and the second drying tube group 82 located on both sides of the inside of the casing 10 dry the refrigerant in the air flow channel, so that the refrigerant is more fully vaporized. The gaseous refrigerant generated during the evaporation process is discharged through the air outlet 22 on the top of the casing 10.

FIG. 2 shows a second embodiment of the evaporator of the present disclosure. Compared with the first embodiment, the technical solution of the second embodiment is different in that the evaporator further includes a second homogenizing tube group 52. The second liquid equalizing tube group 52 is disposed in the casing 10 and is located between the liquid distributor 30 and the first heat exchange tube group 41. The diameter of the heat exchange tube of the second liquid equalization tube group 52 is smaller than that of the first heat exchange tube group 41. The heat distribution tube density of the second liquid equalization tube group 52 is larger than that of the first heat exchange tube group 41. Distribution density of heat exchange tubes. After the refrigerant is distributed from the liquid distributor 30, it falls on the second homogenizing tube group 52, is evaporated by the second homogenizing tube group 52, and better homogenizes, so that the refrigerant can be more evenly distributed to the first heat exchange The tube group 41 improves the heat exchange uniformity of the evaporator.

As a more preferred embodiment, the evaporator further includes a third homogenizing tube group 53. The third homogenizing tube group 53 is disposed in the casing 10 and is located in the second heat exchange tube group 42 and the superheated heat exchange tube. Between group 60. The heat exchange tube diameter of the third homogenization tube group 53 is smaller than that of the superheated heat exchange tube group 60. The heat exchange tube distribution density of the third homogenization tube group 53 is greater than that of the superheated heat exchange tube group 60. Tube distribution density. The liquid refrigerant evaporated by the second heat exchange tube group 42 will fall on the third homogenization tube group 53 and be evaporated and better homogenized, so that the refrigerant can be more evenly distributed to the superheated heat exchange tube group. 60, improve the heat exchange uniformity of the evaporator.

As shown in FIG. 2, the first heat exchange tube group 41 is located in the upper middle portion of the casing 10, and the second heat exchange tube group 42 is located in the lower middle portion of the casing 10. Preferably, the first liquid equalizing tube group 51 is divided into two parts, the first part is close to the first heat exchange tube group 41, and the second part is close to the second heat exchange tube group 42.

In the technical solution of the second embodiment, after the liquid refrigerant enters the casing 10 through the liquid inlet 21, the liquid distributor 30 is evenly distributed on the second homogenizing tube group 52, and is evaporated and homogenized by the second homogenizing tube group 52. Then, it falls on the first heat exchange tube group 41 for evaporation. The remaining liquid refrigerant drips from the first heat exchange tube group 41 to the first liquid equalization tube group 51. Through the first liquid equalization tube group 51, the refrigerant can be evaporated and distributed more evenly. The refrigerant will drip on the second heat exchange tube group 42 for evaporation. The non-evaporated liquid refrigerant will continue to fall, falling on the third homogenizing tube group 53, and being evaporated and homogenized by the third homogenizing tube group 53, so that the refrigerant can be more evenly distributed to the superheated heat exchange tube group 60. on. The remaining refrigerant drips and collects in the lower part of the casing 10 and is evaporated by the superheated heat exchange tube group 60 and the booster tube group 70. At the same time, the booster tube group 70 also prevents the refrigerant in the lower portion of the casing 10 from sucking and liquid . The first drying tube group 81 and the second drying tube group 82 located on both sides of the inside of the casing 10 dry the refrigerant in the air flow channel, so that the refrigerant is more fully vaporized. The gaseous refrigerant generated during the evaporation process is discharged through the air outlet 22 on the top of the casing 10.

It should be noted that the above technical solution of the evaporator is particularly suitable for a falling film evaporator. The first heat exchange tube group 41, the second heat exchange tube group 42 and the superheated heat exchange tube group 60 may be large heat exchange tubes with the same diameter or large heat exchange tubes with different diameters. The first liquid equalizing tube group 51, the second liquid equalizing tube group 52, the third liquid equalizing tube group 53, the synergistic tube group 70, the first drying tube group 81, and the second drying tube group 82 can be small-sized replacement tubes of the same diameter. The heat pipes can also be small heat exchange pipes with different diameters.

The present disclosure also provides an air conditioning unit including the evaporator described above. The above-mentioned evaporator air conditioner unit can make the liquid refrigerant more evenly distributed during the evaporation process, and effectively prevent the phenomenon of suction and liquid, which is conducive to protecting the service life of the compressor, improving the evaporation efficiency of the liquid refrigerant, and thereby improving Operating efficiency of air-conditioning units.

The above are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the embodiments of the present disclosure may have various modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of this disclosure shall be included in the protection scope of this disclosure.

Claims

An evaporator, comprising:

Shell (10);

The liquid inlet (21) and the air outlet (22) are arranged on the casing (10);

A liquid distributor (30) is disposed in the upper part of the casing (10) and corresponds to the liquid inlet (21). The liquid distributor (30) is used for the liquid inlet ( 21) Disperse the refrigerant flowing in;

A first heat exchange tube group (41), arranged in the casing (10), and located below the liquid distributor (30);

A second heat exchange tube group (42) is disposed in the casing (10) and is located below the first heat exchange tube group (41);

A first homogenizing tube group (51) is disposed in the casing (10) and is located between the first heat exchange tube group (41) and the second heat exchange tube group (42). The diameter of the heat exchange tube of the first liquid equalizing tube group (51) is smaller than the diameter of the heat exchange tube of the first liquid equalizing tube group (41), and the heat exchange tube of the first liquid equalizing tube group (51) The distribution density is greater than the distribution density of the heat exchange tubes of the first heat exchange tube group (41).
The evaporator according to claim 1, wherein the evaporator further comprises a second homogenizing tube group (52), and the second homogenizing tube group (52) is disposed in the casing (10) And is located between the liquid distributor (30) and the first heat exchange tube group (41), and the heat exchange tube diameter of the second liquid equalization tube group (52) is smaller than that of the first heat exchange tube group The diameter of the heat exchange tubes of the heat pipe group (41), and the distribution density of the heat exchange tubes of the second homogenization pipe group (52) is greater than the distribution density of the heat exchange tubes of the first heat exchange tube group (41).
The evaporator according to claim 1, characterized in that the evaporator further comprises a superheated heat exchange tube group (60), the superheated heat exchange tube group (60) provided in the casing (10) The lower part is located below the second heat exchange tube group (42).
The evaporator according to claim 3, wherein the evaporator further comprises a third homogenizing tube group (53), and the third homogenizing tube group (53) is disposed in the casing (10) Inside, and is located between the second heat exchange tube group (42) and the superheated heat exchange tube group (60), and the heat exchange tube diameter of the third homogenization tube group (53) is smaller than the superheated The diameter of the heat exchange tubes of the heat exchange tube group (60), and the distribution density of the heat exchange tubes of the third homogenization tube group (53) is greater than the distribution density of the heat exchange tubes of the superheated heat exchange tube group (60).
The evaporator according to claim 3, wherein the evaporator further comprises a booster tube group (70), the booster tube group (70) is disposed in the casing (10) and is located at Below the superheated heat exchange tube group (60), the diameter of the heat exchange tube of the efficiency enhancement tube group (70) is smaller than the diameter of the heat exchange tube of the superheated heat exchange tube group (60). The distribution density of the heat exchange tubes of the tube group (70) is greater than the distribution density of the heat exchange tubes of the superheated heat exchange tube group (60).
The evaporator according to claim 3, wherein the evaporator further comprises a first drying tube group (81) and a second drying tube group (82), the first drying tube group (81) and all The second drying tube group (82) is respectively distributed on two sides in the casing (10).
The evaporator according to claim 3, wherein the first heat exchange tube group (41), the second heat exchange tube group (42), and the superheated heat exchange tube group (60) are distributed in The middle of the casing (10) in the width direction.
The evaporator according to claim 1, wherein the first homogenizing tube group (51) is divided into two parts, a first part is close to the first heat exchanging tube group (41), and a second part It is close to the second heat exchange tube group (42).
The evaporator according to any one of claims 1 to 8, wherein the evaporator is a falling film evaporator.
An air conditioning unit includes an evaporator, wherein the evaporator is the evaporator according to any one of claims 1 to 9.