Split type all-year-round refrigeration air conditioner and refrigeration system

Abstract

The utility model relates to refrigeration equipment technical field discloses a kind of split type all-year-round refrigeration air conditioners, including indoor unit, its shell interior is provided with evaporator, throttling element, intermediate heat exchanger and compressor, the intermediate heat exchanger includes the first flow channel and second flow channel of interthermal conduction;The evaporator, throttling element, first flow channel and compressor are sequentially communicated to form refrigerant circulation loop;The shell of indoor unit is provided with inner machine air inlet and inner machine fan;Outdoor unit, its shell interior is provided with radiator, the radiator with the second flow channel is communicated to form brine circulation loop;The shell of outdoor unit is provided with outer machine air inlet and outer machine fan respectively. The utility model is integrated in the interior of indoor unit by core component, and is communicated by intermediate heat exchanger and outdoor radiator, effectively solve the problem of condensing pressure deficiency caused by low temperature under severe cold weather, realize the stable and efficient refrigeration performance of all year round.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, and in particular to a split-type year-round refrigeration air conditioner and refrigeration system. Background Technology

[0002] In frigid northern regions during winter (e.g., -30°C to -40°C), heat-generating equipment rooms such as computer rooms require continuous cooling and heat dissipation year-round. Traditional split-type air conditioners have their compressors and condensers located in the outdoor unit. When the ambient temperature drops below -10°C, the refrigerant pressure becomes too low, causing frequent low-pressure protection shutdowns. Even with inverter technology, they cannot operate normally below -15°C. The core issue is that the low temperature causes the compressor lubricating oil to become viscous when the outdoor compressor is not working, leading to lubrication deterioration and difficulty in starting the compressor. Simultaneously, the extremely low ambient temperature results in excessively low condensing temperature and pressure, preventing the refrigerant from completing an effective condensation cycle.

[0003] Therefore, the current problem is that it is difficult to ensure that core components such as compressors can operate stably at extremely low temperatures, making it difficult to achieve the goal of year-round cooling. Summary of the Invention

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the problem in the prior art that it is difficult to ensure that the core components can still be stably cooled at extremely low temperatures, and it is difficult to achieve cooling all year round.

[0005] To solve the above-mentioned technical problems, this utility model provides a split-type year-round cooling air conditioner, comprising: The indoor unit has an evaporator, a throttling element, an intermediate heat exchanger, and a compressor inside its casing. The intermediate heat exchanger includes a first flow channel and a second flow channel, which conduct heat to each other. The evaporator, the throttling element, the first flow channel, and the compressor are connected in sequence through pipes to form a refrigerant circulation loop. The indoor unit casing has an indoor unit air inlet and an indoor unit fan. The outdoor unit has a radiator installed inside its casing. The radiator is connected to the second flow channel through a pipe to form a refrigerant circulation loop. An outdoor unit air inlet and an outdoor unit fan are respectively installed at both ends of the outdoor unit casing.

[0006] In one embodiment of this utility model, the exhaust port of the compressor is connected to the inlet of the first flow channel; the outlet of the first flow channel is connected to the inlet of the throttling element; the outlet of the throttling element is connected to the inlet of the evaporator through a connecting pipe; and the outlet of the evaporator is connected to the suction port of the compressor through a connecting pipe.

[0007] In one embodiment of this utility model, the refrigerant circuit is provided with a circulation pump and a pressure stabilizing tank connected in the housing of the indoor unit, the outlet of the second flow channel is connected to the inlet of the circulation pump, and the outlet of the circulation pump is connected to the radiator; the pressure stabilizing tank is connected to the connecting pipe between the second flow channel and the circulation pump.

[0008] In one embodiment of the present invention, an indoor unit air duct is formed inside the casing of the indoor unit, and the evaporator is located on the airflow path between the indoor unit air inlet and the indoor unit fan. The indoor unit fan drives the airflow to enter the indoor unit air duct from the indoor unit air inlet and then exit after passing through the evaporator.

[0009] In one embodiment of this utility model, an outdoor unit air duct is formed inside the casing of the outdoor unit. The airflow driven by the outdoor unit fan enters the outdoor unit air duct through the outdoor unit air inlet and passes through the radiator before being discharged.

[0010] In one embodiment of this utility model, a partition is provided inside the housing of the indoor unit, and the edge of the partition is sealed to the inner wall of the housing of the indoor unit.

[0011] In one embodiment of this utility model, the indoor unit air inlet is located on the side wall of the indoor unit housing above the partition.

[0012] Based on the same concept, this utility model also provides a refrigeration system, including the split-type year-round refrigeration air conditioner, for indoor refrigeration.

[0013] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects: This invention relates to a split-type year-round cooling air conditioner that integrates core components such as the compressor and intermediate heat exchanger inside the indoor unit. It also constructs a closed refrigerant circuit connected to the outdoor radiator via the second flow channel of the intermediate heat exchanger, solving the problem of traditional air conditioners shutting down due to insufficient condensing pressure caused by low temperatures in extremely cold weather. Because the compressor and other critical equipment are entirely located indoors, the direct interference of outdoor low temperatures on the refrigerant circulation circuit is isolated, ensuring continuous and stable cooling in extremely low-temperature environments. Simultaneously, it meets the needs of situations where wind and sand are prevalent in the northwest, making fresh air heat exchange inconvenient, and where year-round cooling is required between heat-generating equipment, thus achieving year-round cooling. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. Figure 1 This is a schematic diagram of the structure of the split-type year-round cooling air conditioner in this embodiment of the present invention; Figure 2This is a flowchart illustrating the refrigerant heat exchange and circulation process in the refrigeration process of this utility model embodiment; Figure 3 This is a flowchart illustrating the heat exchange and circulation process of the refrigerant in the refrigeration process of this utility model embodiment; Figure 4 This is a schematic diagram of the structure of a split-type year-round cooling air conditioner with an added partition in an embodiment of this utility model.

[0015] Explanation of reference numerals in the instruction manual: 1. Indoor unit; 2. Outdoor unit; 11. Evaporator; 12. Throttling element; 13. Intermediate heat exchanger; 14. Compressor; 15. Indoor unit air inlet; 16. Indoor unit air duct; 17. Indoor unit fan; 18. Circulation pump; 19. Baffle; 21. Radiator; 22. Outdoor unit fan; 23. Outdoor unit air duct; 24. Outdoor unit air inlet; 131. First flow channel; 132. Second flow channel; 181. Pressure stabilizing tank. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention. Example

[0017] Reference Figure 1 As shown, the split-type year-round cooling air conditioner of this embodiment includes: an indoor unit 1, wherein an evaporator 11, a throttling element 12, an intermediate heat exchanger 13, and a compressor 14 are disposed inside the casing of the indoor unit 1, the intermediate heat exchanger 13 includes a first flow channel 131 and a second flow channel 132, the first flow channel 131 and the second flow channel 132 conducting heat to each other; the evaporator 11, the throttling element 12, the first flow channel 131 and the compressor 14 are connected in sequence through pipes to form a refrigerant circulation loop; an indoor unit air inlet 15 and an indoor unit fan 17 are disposed on the casing of the indoor unit 1; and an outdoor unit 2, wherein a radiator 21 is disposed inside the casing of the outdoor unit 2, the radiator 21 and the second flow channel 132 are connected through pipes to form a refrigerant circulation loop; an outdoor unit air inlet 24 and an outdoor unit fan 22 are respectively disposed at both ends of the casing of the outdoor unit 2.

[0018] The split-type year-round cooling air conditioner of this embodiment completely encloses the refrigerant circulation system in the indoor environment and uses an intermediate heat exchanger 13 to achieve heat exchange. This design can avoid the problem of the refrigerant circulation system being unable to operate stably due to the low temperature environment in severe cold weather. By introducing a secondary refrigerant circulation system, the outdoor unit 2 only undertakes the function of secondary refrigerant circulation cooling, thereby reducing the structural complexity inside the outdoor unit 2. At the same time, since fresh air is not introduced for heat exchange in winter, the influence of external sand and salt spray on the indoor environment is isolated.

[0019] The exhaust port of the compressor 14 is connected to the inlet of the first flow channel 131; the outlet of the first flow channel 131 is connected to the inlet of the throttling element 12; the outlet of the throttling element 12 is connected to the inlet of the evaporator 11 through a connecting pipe; and the outlet of the evaporator 11 is connected to the suction port of the compressor 14 through a connecting pipe.

[0020] Reference Figure 2 As shown, during the refrigeration cycle, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 14 first enters the first flow channel 131, and exchanges heat with the refrigerant in the second flow channel 132 through the heat-conducting wall of the intermediate heat exchanger 13, thereby achieving refrigerant condensation. Subsequently, the condensed liquid refrigerant flows through the throttling element 12 to reduce its pressure, forming a low-temperature and low-pressure state, and enters the evaporator 11, where it absorbs heat from the indoor air and completely vaporizes. Finally, the gaseous refrigerant returns to the suction port of the compressor 14 through the connecting pipe, forming a closed loop.

[0021] An indoor unit air duct 16 is formed inside the casing of the indoor unit 1. The evaporator 11 is located on the airflow path between the indoor unit air inlet 15 and the indoor unit fan 17. The indoor unit fan 17 drives the airflow to enter the indoor unit air duct 16 from the indoor unit air inlet 15 and then exit after passing through the evaporator 11.

[0022] Specifically, hot indoor air enters the casing of the indoor unit 1 through the air inlet 15 and flows through the fins of the evaporator 11, where it exchanges heat with the refrigerant in the evaporator 11. After releasing heat, the hot air is discharged by the indoor unit fan 17, thereby reducing the indoor temperature. The refrigerant in the evaporator 11 absorbs heat from the high-temperature air, transforming into a medium-temperature, low-pressure gas (approximately 10-15°C), and enters the compressor 14 through a connecting pipe. The compressor 14 compresses the medium-temperature, low-pressure gas from the evaporator 11 into a high-temperature, high-pressure gas (approximately 80-90°C), and delivers it to the intermediate heat exchanger 13. The high-temperature, high-pressure gas enters the first flow channel 131, releases heat to the refrigerant in the second flow channel 132, and condenses into a medium-temperature, high-pressure liquid (approximately 35-45°C). This liquid refrigerant then enters the throttling element 12, where it is depressurized and transformed into a medium-temperature, low-pressure gas-liquid two-phase state (approximately 5-10°C), and enters the evaporator 11 through a connecting pipe. Inside the evaporator 11, the refrigerant re-vaporizes and absorbs heat from the indoor air, forming a cycle.

[0023] The throttling element 12 can be an electronic expansion valve, a capillary tube, or a thermal collision valve. It forces the medium-temperature, high-pressure liquid refrigerant from the first flow channel 131 to be throttled and depressurized through a narrow flow channel, transforming it into a medium-temperature, low-pressure gas-liquid two-phase state, thus creating the necessary conditions for the efficient vaporization of the refrigerant in the evaporator 11.

[0024] Reference Figure 3As shown, in this embodiment of the split-type year-round cooling air conditioner, the refrigerant circuit is connected to a circulation pump 18 and a pressure stabilizing tank 181 within the casing of the indoor unit 1. The outlet of the second flow channel 132 is connected to the inlet of the circulation pump 18, and the outlet of the circulation pump 18 is connected to the radiator 21. The pressure stabilizing tank 181 is connected to the connecting pipe between the second flow channel 132 and the circulation pump 18, which ensures the stability of the pressure at the inlet of the circulation pump 18.

[0025] The refrigerant can be an ethylene glycol solution. After heat exchange with the high-temperature refrigerant in the first channel 131 within the second channel 132, the high-temperature ethylene glycol solution is driven by the circulation pump 18 and flows out from the outlet of the second channel 132 into the pressure stabilizing tank 181 to stabilize the flow rate and pressure. Subsequently, the ethylene glycol solution is pressurized by the circulation pump 18 and transported to the radiator 21. Within the radiator 21, heat is released to the outdoor air through the finned tube wall, causing the ethylene glycol solution to drop to a medium-low temperature. The medium-low temperature ethylene glycol solution eventually returns to the inlet of the second channel 132. While flowing through the second channel 132, it absorbs heat from the high-pressure refrigerant in the first channel 131 through heat conduction, and is heated back to a high-temperature ethylene glycol solution, completing the closed loop.

[0026] The pressure stabilizing tank 181 dynamically balances the volume fluctuations of the ethylene glycol solution caused by drastic temperature changes through an elastic air bladder diaphragm structure, maintains a stable inlet pressure of the circulating pump 18, eliminates the risk of cavitation, and ensures a constant flow rate.

[0027] In this embodiment of the split-type year-round cooling air conditioner, an outdoor unit air duct 23 is formed inside the casing of the outdoor unit 2. The outdoor unit fan 22 drives the airflow to enter the outdoor unit air duct 23 through the outdoor unit air inlet 24 and then exit after passing through the radiator 21.

[0028] The outdoor unit fan 22 drives ambient air into the outdoor unit air duct 23, through the fins of the radiator 21, absorbs the heat from the high-temperature ethylene glycol solution inside the radiator 21, and after completing the heat exchange, it is discharged from the outdoor unit fan 22 into the atmospheric environment.

[0029] Specifically, in the outdoor unit air duct 23, the airflow is restricted to a specific path; after the outdoor unit fan 22 is started, outside air enters from the inlet of the outdoor unit air duct 23, flows along it across the surface of the fins of the radiator 21, and is then discharged from the outlet.

[0030] In this embodiment of the split-type year-round cooling air conditioner, the outdoor unit fan 22 is equipped with a temperature sensor. The temperature sensor is interlocked with the outdoor unit fan 22 for control. When the ambient temperature is too low, the outdoor unit fan 22 can be stopped or its airflow reduced.

[0031] In practical use, when the outdoor temperature is low in winter, the compressor 14 can start normally and cool; when the circulation pump 18 is turned on, the heat generated by the indoor compressor can be conducted to the outside under the action of the circulation pump 18, and the heat in the pipeline can be dissipated normally. Correspondingly, the low temperature outside can be conducted to the first flow channel 131 through the refrigerant, which can improve the indoor cooling effect; when the outdoor temperature is high in summer, the heat generated in the refrigerant circulation loop needs to be reduced by the external radiator 21, and the outdoor fan needs to be turned on to ensure that the heat in the loop can be transferred quickly.

[0032] Traditional split-type air conditioners' outdoor unit fan 22 operates solely based on preset programs or manual settings, unable to dynamically adjust its speed according to ambient temperature. This solution, however, achieves real-time matching of heat dissipation intensity and ambient temperature through closed-loop control of a temperature sensor and the outdoor unit fan 22. This avoids system shutdowns caused by abnormal condensing pressure under low-temperature conditions and reduces the risk of dust and salt mist intruding into the room when using fresh air cooling.

[0033] The circulating pump 18 can be a variable frequency pump. In winter, when the outdoor temperature is low, the flow rate of the circulating pump 18 is reduced, which affects the heat exchange between the second flow channel 132 and the high-temperature and high-pressure gas, thereby stabilizing the condensing temperature and achieving the best cooling effect. In summer, when the outdoor temperature is high, the flow rate of the circulating pump 18 is increased, which affects the heat exchange between the second flow channel 132 and the high-temperature and high-pressure gas, thereby stabilizing the condensing temperature and achieving the best cooling effect. Example

[0034] The split-type year-round cooling air conditioner of this embodiment, based on the same cooling principle as Embodiment 1, has a partition 19 inside the indoor unit 1, and the edge of the partition 19 is sealed to the inner wall of the indoor unit 1; the air inlet 15 of the indoor unit is opened at the side wall of the indoor unit 1 above the partition 19.

[0035] Reference Figure 4 As shown, a horizontal partition 19 is installed inside the indoor unit 1. The outer edge of the partition 19 is airtightly connected to the inner wall of the indoor unit 1 through a sealing ring, dividing the indoor unit 1 into independent upper and lower chambers. The evaporator 11 and the intermediate heat exchanger 13 are located in the upper chamber of the partition 19, while the compressor 14, the circulating pump 18, and the pressure stabilizing tank 181 are located in the lower chamber. An indoor air inlet 15 is opened on the side wall of the indoor unit 1 above the partition 19, allowing high-temperature indoor air to enter the upper chamber of the indoor unit 1, flow through the fins of the evaporator 11, and exchange heat with the internal low-temperature refrigerant.

[0036] When the split-type year-round cooling air conditioner is cooling in summer, the compressor 14 and the circulation pump 18 will generate heat. The partition 19 can prevent the temperature of the airflow from increasing first and then decreasing as it passes through the evaporator 11 after entering the indoor unit 1 and passing through the compressor 14 and the circulation pump 18. This solution reduces the cooling load of the compressor 14 and improves the cooling effect. Example

[0037] This utility model provides a refrigeration system, including the split-type year-round refrigeration air conditioner described in Embodiment 1 and Embodiment 2, for indoor refrigeration.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A split-type year-round cooling air conditioner, characterized in that, include: The indoor unit has an evaporator, a throttling element, an intermediate heat exchanger, and a compressor inside its casing. The intermediate heat exchanger includes a first flow channel and a second flow channel, which conduct heat to each other. The evaporator, the throttling element, the first flow channel, and the compressor are connected in sequence through pipes to form a refrigerant circulation loop. The indoor unit casing has an indoor unit air inlet and an indoor unit fan. The outdoor unit has a radiator installed inside its casing. The radiator is connected to the second flow channel through a pipe to form a refrigerant circulation loop. An outdoor unit air inlet and an outdoor unit fan are respectively installed at both ends of the outdoor unit casing.

2. The split-type year-round cooling air conditioner according to claim 1, characterized in that: The compressor's exhaust port is connected to the first flow channel inlet; the first flow channel outlet is connected to the throttling element inlet; the throttling element outlet is connected to the evaporator inlet via a connecting pipe. The evaporator outlet is connected to the compressor suction port via a connecting pipe.

3. The split-type year-round cooling air conditioner according to claim 1, characterized in that: The refrigerant circulation loop is connected to a circulation pump and a pressure tank within the casing of the indoor unit. The outlet of the second flow channel is connected to the inlet of the circulation pump, and the outlet of the circulation pump is connected to the radiator. The pressure tank is connected to the connecting pipe between the second flow channel and the circulation pump.

4. The split-type year-round cooling air conditioner according to claim 1, characterized in that: An indoor unit air duct is formed inside the casing of the indoor unit. The evaporator is located on the airflow path between the indoor unit air inlet and the indoor unit fan. The indoor unit fan drives the airflow to enter the indoor unit air duct from the indoor unit air inlet and then exit after passing through the evaporator.

5. The split-type year-round cooling air conditioner according to claim 1, characterized in that: An outdoor unit air duct is formed inside the casing of the outdoor unit. The airflow driven by the outdoor unit fan enters the outdoor unit air duct through the outdoor unit air inlet and passes through the radiator before being discharged.

6. The split-type year-round cooling air conditioner according to claim 1, characterized in that: The indoor unit has a partition inside its housing, and the edge of the partition is sealed to the inner wall of the indoor unit's housing.

7. The split-type year-round cooling air conditioner according to claim 6, characterized in that: The indoor unit's air inlet is located on the side wall of the indoor unit's casing, above the partition.

8. A refrigeration system, characterized in that: Includes the split-type year-round cooling air conditioner as described in any one of claims 1 to 7, used for indoor cooling.

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