Self-cascade heat regenerator based on micro-channel heat exchanger

Abstract

The utility model discloses an auto-cascade heat regenerator based on a micro-channel heat exchanger. The auto-cascade heat regenerator comprises a compressor, the heat exchanger and an evaporator. The output end of the compressor is condensed through the condenser and returns to the input end of the compressor after passing through the heat exchanger; the heat exchanger precools a refrigerant in the evaporator through regenerative heat, and the heat exchanger is a micro-channel heat exchanger. The input end and the output end of the evaporator are connected with the heat exchanger through pipelines, and the pre-cooled refrigerant passes through the evaporator and is evaporated for refrigeration. According to the utility model, the refrigerant at the evaporator end is precooled through the micro-channel heat exchanger, the refrigerant before throttling at the evaporator end is effectively precooled in a cascade backheating manner, and the temperature of the refrigerant at the evaporator end is effectively reduced, so that the refrigeration temperature of the evaporator is greatly reduced, and the air conditioner has the characteristics of simple structure and good refrigeration effect.

Description

Technical Field

[0001] The utility model relates to the field of cascade regenerators, in particular to a self-cascade regenerator based on a microchannel heat exchanger. Background Art

[0002] Regenerator is also called gas-liquid heat exchanger. In the Freon refrigeration system, the refrigerant vapor coming out of the evaporator is used to cool the high-pressure liquid before entering the evaporator, so that the refrigerant liquid is supercooled and the vapor is superheated. The characteristic of the regenerator is that the cold and hot fluids flow alternately through the same flow channel space, and the fluids achieve heat exchange through direct contact with the regenerator filler. From the perspective of the heat exchanger, due to the large volume heat capacity of the filler, large heat exchange area, and small resistance along the way, the regenerator has the advantages of simple and compact structure and high heat exchange efficiency. At the same time, since the cold and hot fluids flow alternately through the same flow channel space, the cold gas can sublimate the solid phase deposited on the surface of the filler during the hot blowing period when passing through the regenerator, creating the self-cleaning characteristics of the regenerator. From the perspective of system thermal efficiency, the heat recovery process achieved by the regenerator can often improve the thermal efficiency of the system.

[0003] With the development of industry, the demand and requirements for high and low temperature tests in scientific research, medical treatment, electronics, chemical industry and other industries are getting higher and higher, requiring lower refrigeration temperature, faster cooling rate, and temperature shock in a wider temperature range, making the application of -80℃ refrigeration technology common. At present, the cost of cascade refrigeration (two-stage cascade, three-stage cascade) is relatively high. The existing single-separation and multi-stage separation cascade refrigeration systems have complex structures, large unit sizes, high production costs, and certain defects. Utility Model Content

[0004] The utility model aims to provide a self-cascade regenerator based on a microchannel heat exchanger to improve the refrigeration effect while having a simple structure.

[0005] In order to solve the above technical problems, the utility model provides a self-cascade regenerator based on a microchannel heat exchanger, comprising a compressor, a heat exchanger and an evaporator;

[0006] The output end of the compressor is condensed by the condenser and returns to the input end of the compressor after passing through the heat exchanger;

[0007] The heat exchanger utilizes heat recovery to precool the refrigerant in the evaporator, and the heat exchanger is a microchannel heat exchanger;

[0008] The input end and the output end of the evaporator are connected to the heat exchanger through pipelines, and the precooled refrigerant passes through the evaporator and performs cooling by evaporation.

[0009] Furthermore, an oil separator is provided between the compressor and the condenser.

[0010] Furthermore, the oil separator is used to separate oil and liquid from the compressor, and the oil output end of the oil separator is connected to the compressor.

[0011] Furthermore, a first drying filter is provided between the condenser and the heat exchanger.

[0012] Furthermore, a second drying filter is provided between the heat exchanger and the input end of the evaporator.

[0013] Furthermore, a throttling device is provided between the second drying filter and the input end of the evaporator.

[0014] Furthermore, the throttling device is an expansion valve or a capillary tube.

[0015] Furthermore, the refrigerant is a mixed refrigerant.

[0016] Compared with the prior art, the utility model has at least the following beneficial effects:

[0017] The utility model precools the refrigerant at the evaporator end through a microchannel heat exchanger, and effectively precools the refrigerant before throttling at the evaporator end by a cascade heat recovery method, effectively lowers the temperature of the refrigerant at the evaporator end, thereby greatly lowering the refrigeration temperature of the evaporator, and has the characteristics of simple structure and good refrigeration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the overall structure of the self-cascade regenerator based on the microchannel heat exchanger. DETAILED DESCRIPTION

[0019] The following will be combined with a schematic diagram to describe the self-cascade regenerator based on a microchannel heat exchanger of the present invention in more detail, wherein the preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art can modify the present invention described herein, while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art, and not as a limitation to the present invention.

[0020] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] like Figure 1As shown, the embodiment of the utility model proposes a self-cascade regenerator based on a microchannel heat exchanger 3, including a compressor 1, a heat exchanger 3 and an evaporator 4.

[0022] Specifically, the output end of the compressor is condensed by the condenser 2 and returns to the input end of the compressor 1 after passing through the heat exchanger 3 .

[0023] The heat exchanger 3 utilizes heat recovery to precool the refrigerant in the evaporator 4 , and the heat exchanger 3 is a microchannel heat exchanger 3 .

[0024] The input end and the output end of the evaporator 4 are connected to the heat exchanger 3 through pipelines, and the precooled refrigerant passes through the evaporator 4 and is cooled by evaporation.

[0025] In this embodiment, the refrigerant is compressed into high-temperature and high-pressure gas in the compressor 1, enters the condenser 2, and after being condensed to room temperature in the condenser 2, enters the heat exchanger 3, and the refrigerant at the evaporator 4 end is cooled again in the heat exchanger 3, and then enters the evaporator 4 for refrigeration. After the refrigerant is refrigerated in the evaporator 4, it enters the heat exchanger 3 for pre-cooling cycle. At the same time, the refrigerant on the compressor 1 side enters the input end of the compressor 1. Since the refrigerant at the evaporator 4 end is pre-cooled in the heat exchanger 3, the limit refrigeration temperature of the evaporator 4 is effectively reduced.

[0026] It should be noted that the refrigerant uses a mixed working fluid. In addition, the microchannel heat exchanger 3 has a channel equivalent diameter of 10-1000μm. There are dozens of fine flow channels in the flat tube of this heat exchanger 3, which are connected to the circular header at both ends of the flat tube. A partition is set in the header to divide the flow channel of the heat exchanger 3 into several processes. The heat exchanger 3 uses a microchannel heat exchanger 3, which can greatly reduce the size of the overall regenerator, thereby facilitating layout and installation.

[0027] Furthermore, an oil separator 5 is provided between the compressor 1 and the condenser 2 .

[0028] Specifically, the oil separator 5 is used to separate oil from liquid in the compressor 1 , and an oil output end of the oil separator 5 is connected to the compressor 1 .

[0029] The oil separator 5 can separate the lubricating oil in the high-pressure refrigerant vapor discharged from the compressor 1 to ensure safe and efficient operation of the system. According to the oil separation principle of reducing the air flow speed and changing the air flow direction, the oil particles in the high-pressure vapor can be separated under the action of gravity.

[0030] Furthermore, a first drying filter 6 is provided between the condenser 2 and the heat exchanger 3, and a second drying filter 7 is provided between the heat exchanger 3 and the input end of the evaporator 4. The first drying filter 6 and the second drying filter 7 play the role of filtering impurities and drying water.

[0031] Furthermore, a throttling device 8 is provided between the second drying filter 7 and the input end of the evaporator 4 .

[0032] Specifically, the throttling device 8 throttles and reduces the pressure of the high-pressure refrigeration to ensure the pressure difference between the condenser 2 and the evaporator 4, so that the liquid refrigerant in the evaporator 4 absorbs heat and evaporates at the required low pressure, thereby achieving the purpose of refrigeration and temperature reduction.

[0033] In a specific embodiment, the throttling device 8 is an expansion valve or a capillary tube.

[0034] Compared with the prior art, the utility model has at least the following beneficial effects:

[0035] The utility model precools the refrigerant at the evaporator end through a microchannel heat exchanger, and effectively precools the refrigerant before throttling at the evaporator end by a cascade heat recovery method, effectively lowers the temperature of the refrigerant at the evaporator end, thereby greatly lowering the refrigeration temperature of the evaporator, and has the characteristics of simple structure and good refrigeration effect.

[0036] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A self-cascade regenerator based on a microchannel heat exchanger, characterized in that: Includes compressor, heat exchanger and evaporator; The output end of the compressor is condensed by the condenser and returns to the input end of the compressor after passing through the heat exchanger; The heat exchanger utilizes heat recovery to precool the refrigerant in the evaporator, and the heat exchanger is a microchannel heat exchanger; The input end and the output end of the evaporator are connected to the heat exchanger through pipelines, and the precooled refrigerant passes through the evaporator and performs cooling through evaporation.

2. The self-cascade regenerator based on a microchannel heat exchanger according to claim 1, characterized in that: An oil separator is provided between the compressor and the condenser.

3. The self-cascade regenerator based on microchannel heat exchanger according to claim 2, characterized in that: The oil separator is used to separate oil from liquid in the compressor, and an oil output end of the oil separator is connected to the compressor.

4. The self-cascade regenerator based on a microchannel heat exchanger according to claim 1, characterized in that: A first drying filter is arranged between the condenser and the heat exchanger.

5. The self-cascade regenerator based on a microchannel heat exchanger according to claim 1, characterized in that: A second drying filter is arranged between the heat exchanger and the input end of the evaporator.

6. The self-cascade regenerator based on a microchannel heat exchanger according to claim 5, characterized in that: A throttling device is provided between the second drying filter and the input end of the evaporator.

7. The self-cascade regenerator based on a microchannel heat exchanger according to claim 6, characterized in that: The throttling device is one of an expansion valve and a capillary tube.

8. The self-cascade regenerator based on microchannel heat exchanger according to claim 1, characterized in that: The refrigerant is a mixed refrigerant.

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