Micro-channel type integral refrigerating unit

Abstract

The utility model discloses a micro-channel type integral refrigerating unit which comprises a base, a compressor, a cooling fan, an electromagnetic valve, an evaporator and a condenser. The condenser comprises a condensation heat dissipation shell and a condensation flat pipe; the condensing flat pipes are distributed in a snakelike surrounding mode, the condensing flat pipes are of a flat structure, the surface area in contact with air can be greatly expanded, and the heat exchange capacity is multiplied. The first fins are inserted between the condensation flat pipes through the inserting grooves, the first fins can be conveniently welded and fixed to the U-shaped circularly-distributed second fins on the condensation flat pipes subsequently, the U-shaped bottom faces of the second fins are in the horizontal state and are fixedly welded to the condensation flat pipes, in this way, the contact area between the second fins and the condensation flat pipes can be greatly increased, and therefore the heat exchange effect is improved. The other micro-channel condenser structurally comprises condensing flat tube radiating fins and collecting pipes, two ends of each condensing flat tube are inserted into the collecting pipes according to a certain gap, and the radiating fins are clamped into the gaps of the flat tubes to be welded into a whole.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration unit technology, specifically relating to a microchannel integrated refrigeration unit. Background Technology

[0002] The operation of refrigeration equipment relies on refrigeration units. In order to ensure that the refrigeration equipment can cool down quickly, maintain a constant temperature, and work efficiently and energy-savingly, the structure and system of the refrigeration unit need to be designed.

[0003] A search revealed application number 202321534714.1, which discloses a microchannel heat exchanger comprising: several harmonica tubes; two side plates arranged longitudinally, with the harmonica tubes positioned at the center of the side plates; wherein heat dissipation fins are disposed between adjacent harmonica tubes, and the heat dissipation fins are uniformly arranged along the length of the harmonica tubes. The rectangular corrugated heat dissipation fin design facilitates the formation of airflow channels, preventing clogging of the heat exchange fins. The molecular sieve design enables drying and impurity filtration, contributing to improved reliability of the refrigeration system.

[0004] In the aforementioned patent, the coolant inside the collecting pipe is concentrated inside the collecting pipe and transported to the harmonica tube together, which shortens the movement path of the coolant and thus affects the cooling efficiency. In addition, the traditional round tube condenser is limited by the surface area of ​​the circular cross section. In order to increase the heat exchange, the number of tube rows or the tube length need to be increased, which leads to the expansion of the unit volume and makes it difficult to adapt to the compact installation requirements. At the same time, the connection of the traditional round tube fin is not suitable for the microchannel condenser. Utility Model Content

[0005] The purpose of this invention is to provide a microchannel integrated refrigeration unit to solve the problems of heat exchange efficiency and condenser fin compatibility in existing refrigeration units.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A microchannel integrated refrigeration unit includes a base, a compressor, an evaporator, and a condenser, wherein the compressor is mounted on the base and the condenser is located on the left side of the compressor;

[0008] The condenser includes a condenser heat dissipation shell, and a condenser flat tube is installed inside the condenser heat dissipation shell.

[0009] Preferably, an exhaust fan is located next to the evaporator, and an evaporator cover is installed above the evaporator and the exhaust fan.

[0010] Preferably, the condenser tubes are arranged in a serpentine pattern, with inlet and outlet pipes at both ends, and a plurality of first fins are arranged at equal intervals on the condenser tubes. A variable speed condenser fan is installed on the side of the condenser tubes.

[0011] Preferably, the first fin has a slot on its side, and the width of the slot matches the thickness of the condenser tube.

[0012] Preferably, the condenser flat tube is provided with connecting plates at both ends, and positioning holes are provided on the surface of the connecting plates.

[0013] Preferably, a second fin is connected between the condenser flat tubes, and the second fin is distributed in a U-shape in a circular pattern, with the bottom surface of the "U" shape being horizontal.

[0014] Preferably, a transverse fin is provided on one side of the second fin.

[0015] Preferably, the condenser flat tube has a rectangular sheet shape. A first manifold and a second manifold are installed and connected to both sides of the condenser flat tube. The condenser flat tubes are arranged equidistantly between the first manifold and the second manifold. An inlet pipe and an outlet pipe are installed on the first manifold. Two partition plates are provided inside the first manifold and one partition plate is provided inside the second manifold. A third fin is fixed between the condenser flat tubes.

[0016] Preferably, the third fin is arranged in a U-shaped circular distribution, and the bottom surface of the "U" shape is arc-shaped.

[0017] The technical solution of this utility model has the following beneficial effects:

[0018] 1. The low-temperature, low-pressure gaseous refrigerant in the evaporator is drawn into the compressor and transformed into a high-temperature, high-pressure gas through compression. The high-temperature, high-pressure gaseous refrigerant enters the condenser (condenser flat tube + fin structure), where it is cooled by air and gradually liquefies, releasing heat. The low-temperature, low-pressure refrigerant enters the evaporator and absorbs heat from the surrounding environment, thus lowering the temperature around the evaporator (as cold air is blown out, and the temperature around the evaporator inside the evaporator is discharged through the exhaust fan of this invention). The condenser flat tubes are arranged in a serpentine pattern, and the flat structure of the condenser flat tubes can greatly expand the surface area in contact with air, thus doubling the heat exchange capacity.

[0019] 2. The first fin is inserted between the condenser flat tubes through a slot, which facilitates the subsequent welding and fixing of the first fin onto the condenser flat tube.

[0020] 3. The second fin, distributed in a U-shape, has its bottom surface of the "U" horizontal and is welded and fixed to the condensing flat tube. This significantly increases the contact area between the second fin and the condensing flat tube, thereby improving the heat exchange effect. One end of the horizontal fin is connected to the bend of the condensing flat tube, which can absorb heat while ensuring the connection strength between the condensing flat tube, the horizontal fin, and the second fin, thus improving the vibration resistance.

[0021] 4. The parallel flow design allows for more uniform and stable refrigerant flow within the channels, reducing uneven heat transfer caused by fluid turbulence and local velocity differences. This ensures efficient and continuous heat exchange, further enhancing overall heat transfer performance. The flow distribution via the partitions also improves the coolant's path, thereby increasing cooling efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0025] Figure 3 This is a schematic diagram of the bottom structure of this utility model.

[0026] Figure 4 This is a schematic diagram of the condenser structure of this utility model.

[0027] Figure 5 This is a diagram of the internal structure of the condenser of this utility model.

[0028] Figure 6 This is a schematic diagram of the condenser flat tube structure of this utility model.

[0029] Figure 7 This is a cross-sectional view of the internal structure of the condenser flat tube of this utility model.

[0030] Figure 8 This is an enlarged view of section A of this utility model.

[0031] Figure 9 This is a structural installation diagram of Embodiment 2 of this utility model.

[0032] Figure 10 This is an enlarged view of section B of this utility model.

[0033] Figure 11 This is a schematic diagram of the structure of Embodiment 3 of this utility model.

[0034] Figure 12 This is an enlarged view of point C in this utility model.

[0035] Reference numerals: 10, base; 11, compressor; 12, evaporator cover; 13, evaporator; 14, exhaust fan; 20, condenser; 201, condenser heat dissipation shell; 202, liquid inlet pipe; 203, liquid outlet pipe; 204, condenser flat tube; 205, first fin; 206, slot; 207, connecting plate; 208, positioning hole; 30, variable speed condenser fan; 40, second fin; 401, horizontal fin; 50, first manifold; 501, separator; 502, second manifold; 503, third fin. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0037] Example 1:

[0038] refer to Figures 1-3 A microchannel integrated refrigeration unit includes a base 10, a compressor 11, an evaporator 13 and a condenser 20, wherein the compressor 11 is mounted on the base 10 and the condenser 20 is located to the left of the compressor 11.

[0039] The condenser 20 includes a condenser heat dissipation shell 201, and a condenser flat tube 204 is installed inside the condenser heat dissipation shell 201;

[0040] An exhaust fan 14 is located next to the evaporator 13, and an evaporator box cover 12 is installed above the evaporator 13 and the exhaust fan 14.

[0041] In the above scheme, the working principle of the compressor 11, evaporator 13 and condenser 20 is the existing technical solution, which is summarized here; Compression process: The low temperature and low pressure gaseous refrigerant in the evaporator 13 is drawn into the compressor 11, and is converted into high temperature and high pressure gas by compression work; Condensation process: The high temperature and high pressure gaseous refrigerant enters the condenser 20 (condenser flat tube 204 + fin structure), and is gradually liquefied and releases heat by air cooling. Heat dissipation: The heat of the refrigerant is dissipated to the external environment (e.g., hot air blown out by the outdoor unit of an air conditioner); Throttling process: The high-pressure liquid refrigerant is throttled through the expansion valve (or capillary tube), and the pressure drops sharply, becoming a low-temperature, low-pressure mist mixture (partially liquid + partially gaseous), the purpose of which is to create conditions for the evaporator 13 to absorb heat; Evaporation process: The low-temperature, low-pressure refrigerant enters the evaporator 13, absorbs heat from the surrounding environment (e.g., air inside a refrigerator, air inside an air conditioner), and completely vaporizes into a low-temperature, low-pressure gas, achieving refrigeration; Heat source: The temperature around the evaporator 13 therefore decreases (e.g., cold air is blown out, and the temperature around the evaporator 13 inside the evaporator box cover 12 is discharged by the exhaust fan 14 of this invention).

[0042] Preferred reference Figures 4-8 The condenser flat tube 204 is arranged in a serpentine pattern. The condenser flat tube 204 has an inlet pipe 202 and an outlet pipe 203 at its head and tail. Several first fins 205 are arranged at equal intervals on the condenser flat tube 204. A variable speed condenser fan 30 is installed on the side of the condenser flat tube 204.

[0043] In the above scheme, the high-temperature and high-pressure refrigerant gas is discharged from the compressor 11 and enters the condenser 20 through the liquid inlet pipe 202. At this time, the refrigerant gas has a high temperature and high pressure. The refrigerant gas exchanges heat with the cooling medium in the condenser 20, and the heat is transferred from the refrigerant to the cooling medium, causing the refrigerant gas to gradually cool and condense into a liquid. The condensed liquid refrigerant accumulates at the bottom of the condenser 20 and is discharged through the liquid outlet pipe 203 into the liquid receiver or subsequent throttling device.

[0044] The condenser flat tubes 204 are arranged in a serpentine pattern. The flat structure of the condenser flat tubes 204 can greatly expand the surface area in contact with air, thus doubling the heat exchange capacity.

[0045] The variable speed condenser fan 30 is an EGB5220B motor with adjustable speed and variable direction, which is available on the market.

[0046] This invention allows for precise adjustment of the motor speed according to actual refrigeration needs, resulting in high efficiency and energy saving. The motor in the variable-speed condenser fan 30 possesses precise speed adjustment capabilities, enabling rapid and accurate adjustments based on the real-time operating conditions of the refrigeration system. Furthermore, thanks to its wide speed adjustment range, the motor's operating speed can be flexibly adjusted within a broad range. Additionally, its variable-direction function allows for high-speed backflushing for 60 seconds after power restoration to remove dust from the condenser 20 fins. After 60 seconds, it automatically adjusts to forward rotation. When the condensing pressure exceeds the system setting P1 kg, the fan operates at V1... When the condensing pressure is between P1 and P2 set by the system, the fan speed is V2. When the condensing pressure is below P2, the fan speed drops to V3. After the cooling is finished, the compressor 11 stops, and the variable speed condensing fan 30 stops after a 60-second delay (the specific control method here is reflected in the working process. The actual control is achieved by the circuit program combined with the sensor, which can be understood as a computer control program). The first fin 205 and the condensing flat tube 204 absorb heat through heat transfer, and the variable speed condensing fan 30 can achieve the purpose of rapid heat dissipation.

[0047] Further reference Figure 6 The first fin 205 has a slot 206 on its side, and the width of the slot 206 matches the thickness of the condensing flat tube 204. The first fin 205 is inserted into the condensing flat tube 204 through the slot 206, which facilitates the subsequent welding and fixing of the first fin 205 to the condensing flat tube 204.

[0048] Further reference Figure 6 The condenser flat tube 204 has connecting plates 207 at both ends, and positioning holes 208 are formed on the surface of the connecting plates 207. The connecting plates 207 at both ends are used to contact the inner wall of the condenser heat dissipation shell 201. Bolts are installed inside the positioning holes 208 to facilitate the fixing of the condenser flat tube 204.

[0049] Example 2:

[0050] refer to Figure 9 -and Figure 10 A second fin 40 is connected between the condenser flat tubes 204, and the second fin 40 is distributed in a U-shape in a circular pattern.

[0051] In the above scheme, the second fin 40 with a U-shaped circulating distribution has its bottom surface of the "U" in a horizontal state and is welded and fixed to the condensing flat tube 204. This can greatly increase the contact area between the second fin 40 and the condensing flat tube 204, thereby improving the heat exchange effect.

[0052] Preferred reference Figure 10 A transverse fin 401 is provided on one side of the second fin 40.

[0053] One end of the horizontal fin 401 is connected to the bend of the condenser tube 204, which can absorb heat while ensuring the connection strength between the condenser tube 204, the horizontal fin 401, and the second fin 40, thus improving the vibration resistance.

[0054] Example 3:

[0055] refer to Figure 11 The condenser flat tube 204 is in the shape of a rectangular sheet.

[0056] The condensing flat tube 204 is connected to a first manifold 50 and a second manifold 502 on both sides. The condensing flat tubes 204 are arranged equidistantly between the first manifold 50 and the second manifold 502. The first manifold 50 is equipped with an inlet pipe 202 and an outlet pipe 203. The first manifold 50 is provided with two partition plates 501 inside, and the second manifold 502 is provided with one partition plate 501 inside. A third fin 503 is fixed between the condensing flat tubes 204.

[0057] In the above scheme, Figure 11 In the diagram, the arrows inside the inlet pipe 202 and outlet pipe 203 represent the flow direction of the refrigerant. The arrow inside the first manifold 50 indicates that the refrigerant flows into the condenser flat tube 204 and then into the second manifold 502. The arrow inside the second manifold 502 indicates that the refrigerant flows into the condenser flat tube 204 and then into the first manifold 50. The horizontal dotted line represents the installation position of the partition plate 501. The first manifold 50 has two partition plates 501, which divide the interior of the first manifold 50 into three spaces. The second manifold 502 has one partition plate 501, which divides the interior of the second manifold 502 into two spaces.

[0058] More specifically, the three spaces inside the first manifold 50 are referred to as the "upper and middle-lower" spaces; the two spaces inside the second manifold 502 are referred to as the "top and bottom" spaces.

[0059] First, the refrigerant enters the "upper space" inside the first manifold 50 from the liquid inlet pipe 202. Following the arrow direction in the "upper space," the refrigerant flows into the condenser flat tube 204, then into the "top space" inside the second manifold 502. Following the arrow direction in the "top space," the refrigerant flows into the condenser flat tube 204 again, then into the "middle space" inside the first manifold 50. Following the arrow direction in the "middle space," the refrigerant flows back into the condenser flat tube 204, then into the "bottom space" inside the second manifold 502. Finally, following the arrow direction in the "bottom space," the refrigerant flows into the condenser flat tube 204, then into the "lower space" inside the first manifold 50, and finally exits from the liquid outlet pipe 203, completing one cycle. This flow path of the coolant is improved by the diversion of the separator 501, thereby increasing cooling efficiency.

[0060] Preferably, the third fin 503 is arranged in a U-shaped circular distribution, and its "U"-shaped bottom surface is arc-shaped.

[0061] In this implementation scheme, the condenser flat tubes 204 are arranged in a rectangular sheet shape at equal intervals to form a parallel flow design. High heat exchange efficiency: The parallel flow design allows the refrigerant to flow more evenly and stably within the channel, reducing uneven heat exchange caused by fluid turbulence and local velocity differences. This enables the entire heat exchange process to proceed efficiently and continuously, further enhancing the overall heat exchange performance. Furthermore, due to its compact size, it can be well adapted for installation, meeting the space requirements of diverse equipment for the condenser. Simultaneously, due to its high heat exchange performance, it does not require a large amount of refrigerant to achieve the same cooling effect, unlike traditional condensers, thus reducing refrigerant consumption.

[0062] The specific implementation process of this utility model is as follows:

[0063] Compression process: The low-temperature, low-pressure gaseous refrigerant in the evaporator 13 is drawn into the compressor 11 and converted into a high-temperature, high-pressure gas through compression. Condensation process: The high-temperature, high-pressure gaseous refrigerant enters the condenser 20 (condenser flat tube 204 + fin structure), and is gradually liquefied and releases heat through air cooling. Heat dissipation: The heat of the refrigerant is dissipated to the external environment (e.g., hot air blown out by the outdoor unit of an air conditioner); Throttling process: After condensation, the medium-temperature and medium-pressure liquid refrigerant expands after entering the evaporator through the throttling device. The high-pressure liquid refrigerant is throttled through the expansion valve (or capillary tube), and the pressure drops sharply, becoming a low-temperature and low-pressure mist mixture (partial liquid + partial gas), which aims to create conditions for the evaporator 13 to absorb heat; Evaporation process: The throttled liquid refrigerant enters the evaporator 13, expands and absorbs heat from the surrounding environment (e.g., air inside the refrigerator, air inside the air conditioner), and completely vaporizes into a low-temperature and low-pressure gas, achieving refrigeration. Heat source: The temperature around the evaporator 13 therefore decreases (e.g., cold air is blown out, and the temperature around the evaporator 13 inside the evaporator box cover 12 is discharged by the exhaust fan 14 of this invention).

[0064] The above embodiments are merely exemplary models of this utility model and are not intended to limit this utility model. The scope of protection of this utility model is defined by the claims. Various modifications or equivalent substitutions can be made to this utility model within its substance and scope of protection. Such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this utility model.

[0065] In the description of this utility model, it should be noted that the terms "inner," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the attached circle, or the orientation or positional relationship commonly used when the utility model product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, these terms indicating orientation or positional relationship should not be construed as limitations on this utility model.

[0066] In the description of this utility model, it should be further noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, these terms can refer to a fixed connection, a detachable connection, or an integral connection between components; they can also refer to a mechanical connection or an electrical connection; or they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

Claims

1. A microchannel integrated refrigerant unit comprising a base (10), a compressor (11), an evaporator (13) and a condenser (20), characterized in that: The compressor (11) is mounted on the base (10), and the condenser (20) is on the left side of the compressor (11); The condenser (20) includes a condensation heat dissipation shell (201), and a condensation flat tube (204) is installed inside the condensation heat dissipation shell (201).

2. The micro-channel unitary refrigerant chiller of claim 1, wherein: An exhaust fan (14) is located next to the evaporator (13), and an evaporator box cover (12) is installed above the evaporator (13) and the exhaust fan (14).

3. The micro-channel unitary refrigerant chiller of claim 2, wherein: The condensing flat tube (204) is arranged in a serpentine pattern. The condensing flat tube (204) has an inlet pipe (202) and an outlet pipe (203) at its ends. Several first fins (205) are arranged at equal intervals on the condensing flat tube (204). A variable speed condensing fan (30) is installed on the side of the condensing flat tube (204).

4. The micro-channel unitary refrigerant chiller of claim 3, wherein: The first fin (205) has a slot (206) on its side, and the width of the slot (206) matches the thickness of the condenser flat tube (204).

5. The micro-channel unitary refrigerant chiller of claim 4, wherein: The condenser flat tube (204) is provided with connecting plates (207) at both ends, and positioning holes (208) are provided on the surface of the connecting plates (207).

6. The micro-channel unitary refrigerant chiller of claim 3, wherein: The condenser flat tubes (204) are connected by a second fin (40), which is distributed in a U-shape and has a horizontal bottom surface.

7. The micro-channel unitary refrigerant chiller of claim 6, wherein: A transverse fin (401) is provided on one side of the second fin (40).

8. The micro-channel unitary refrigerant package of claim 1, wherein: The condenser flat tube (204) has a rectangular sheet shape.

9. The micro-channel unitary refrigerant chiller of claim 8, wherein: The condensing flat tube (204) is connected to a first manifold (50) and a second manifold (502) on both sides. The condensing flat tubes (204) are arranged equidistantly between the first manifold (50) and the second manifold (502). The first manifold (50) is equipped with an inlet pipe (202) and an outlet pipe (203). The first manifold (50) is provided with two partition plates (501) inside, and the second manifold (502) is provided with one partition plate (501) inside. A third fin (503) is fixed between the condensing flat tubes (204).

10. The micro-channel unitary refrigerant chiller of claim 9, wherein: The third fin (503) is arranged in a U-shaped circular pattern, and its "U"-shaped bottom surface is arc-shaped.

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