Cold energy recovery compensation system suitable for multi-split heat pump

Abstract

The invention relates to the technical field of heat exchange systems, and provides a cooling capacity recovery compensation system suitable for a multi-split heat pump, which comprises a multi-split pump system, a cooling capacity recovery circulating assembly and a refrigerated cabinet assembly, the output end of the economizer communicates with cooling fins and a flash evaporator, and the output ends of the cooling fins communicate with a first filter. According to the invention, the cold energy recovery circulating assembly is arranged, the throttle valve automatically adjusts the opening degree according to the target set value of the temperature of the refrigerated cabinet memorized by the temperature sensor, and the refrigerant temperature is reduced by absorbing the cold energy released by the heat exchanger of the indoor unit by a refrigerant, so that the cold storage and fresh keeping of food are achieved; and the purpose of assisting the refrigerated cabinet in refrigerating and fresh-keeping is achieved, the function that the system is convenient to adjust the temperature is achieved, and therefore the applicability of the cooling capacity recycling and compensating system suitable for the multi-split heat pump in use is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange systems, and in particular to a cold recovery compensation system suitable for a multi-split heat pump. Background Art

[0002] Cold recovery technology is a technology that collects the cold (or heat) generated during the heating (or cooling) process by setting up a cold recovery device in a multi-split heat pump system, and utilizes it in a certain way. In order to further improve energy utilization efficiency, reduce energy waste, and achieve sustainable energy utilization, a cold recovery compensation system suitable for multi-split heat pumps will be used;

[0003] To this end, the patent with the authorization announcement number CN219301041U discloses a cold recovery and reuse system for an air source heat pump outdoor unit, including a controller, a heat pump unit connected to the controller, and a heat exchange water pipe group for heat exchange with the heat pump unit. The water inlet end of the heat exchange water pipe group is connected to a water pump, and the water outlet end of the heat exchange water pipe group is connected to a terminal cold equipment. The heat pump unit is provided with a cold recovery and reuse device. The heat pump unit includes a compressor, a four-way valve, an indoor heat exchange group, a throttle valve, an outdoor heat exchange group, an outdoor evaporative heat exchange group, and a gas-liquid separator connected through a refrigerant pipe. The cold recovery and reuse device includes a three-way valve and a three-way valve. The three-way valve is connected in parallel with the outdoor evaporative heat exchange group through the three-way valve. The controller controls the action or stop of the three-way valve, the outdoor evaporative heat exchange group, and the water pump according to the temperature required by the terminal cold equipment. The outdoor evaporative heat exchange group is used to produce cold water in the heat dissipation mode, and the cold source of the outdoor evaporative group is fully recovered and utilized to reduce energy waste.

[0004] The above-mentioned air source heat pump outdoor unit cold energy recovery and reuse system is connected in parallel with the outdoor unit evaporative heat exchange group of the heat pump unit through a three-way valve. When the chilled water temperature of the chiller is lower than the target water temperature of the heat pump, the controller controls the three-way valve to be energized, the water pump runs, and the indoor heat exchanger is used to produce cold water mode. When the chilled water temperature of the chiller is higher than the target water temperature of the heat pump, the controller controls the three-way valve to lose power, the water pump stops, and the outdoor unit evaporative heat exchange group is used to produce cold water in the heat dissipation mode, fully recovering the cold source of the outdoor unit evaporative group and reducing energy waste. However, when the device is in use, it is inconvenient to adjust the temperature, which easily leads to energy waste, making it less suitable for use. Summary of the invention

[0005] The purpose of the present invention is to provide a cold recovery compensation system suitable for a multi-split heat pump, so as to solve the defect that the existing cold recovery compensation system suitable for a multi-split heat pump is inconvenient to adjust the extraction temperature.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a cold recovery compensation system suitable for a multi-split heat pump, comprising a heat multi-split pump system, a cold recovery cycle component and a refrigerated cabinet component;

[0007] The multi-split pump system is connected as follows: the output end of the indoor unit heat exchanger is connected to the economizer, the output ends of the economizer are respectively connected to the heat sink and the flash evaporator, the output end of the heat sink is connected to the first filter, the output end of the first filter is connected to the outdoor unit heat exchanger, the output end of the outdoor unit heat exchanger is connected to the four-way reversing valve, the first flow path of the flash evaporator is connected to the first compressor, the second flow path of the flash evaporator is connected to the liquid storage device, and the output end of the first compressor is connected to the oil separator;

[0008] The refrigerator consists of: an evaporator, a second compressor, a condenser, a drying filter located inside the cabinet, and a temperature sensor installed on the inner wall of the cabinet;

[0009] The cold recovery cycle component includes a cold medium heat exchange pipeline and a throttle valve.

[0010] Preferably, the output end of the indoor unit heat exchanger is connected to an indoor unit electronic expansion valve, the input end of the economizer is connected to a first electronic expansion valve, and the heat sink and the first filter are respectively connected to an outdoor unit main expansion valve and an outdoor unit auxiliary expansion valve.

[0011] Preferably, the outdoor unit heat exchanger is connected to the liquid reservoir via a four-way reversing valve, and a second electronic expansion valve is connected between the flash evaporator and the liquid reservoir.

[0012] Preferably, the output end of the liquid accumulator is connected to the input end of the first compressor, the first flow path of the oil separator is connected to the indoor unit heat exchanger through a four-way reversing valve, the four-way reversing valve and the indoor unit heat exchanger are connected through a first filter, and the second flow path of the oil separator is connected to the first compressor. In the process of the refrigerant from the outdoor unit heat exchanger to the indoor unit heat exchanger, it passes through the liquid accumulator, the first compressor, the oil separator, and the first filter in sequence, which respectively play the role of gas-liquid separation, isentropic compression, separation of gaseous refrigerant and lubricating oil, and filtering of impurities.

[0013] Preferably, two groups of the cold medium heat exchange pipes are provided, one group of the cold medium heat exchange pipes is located on one side of the indoor unit heat exchanger, and the other group of the cold medium heat exchange pipes is located on one side of the evaporator.

[0014] Preferably, the output end of the cold medium heat exchange pipe on the indoor unit heat exchanger side is connected to the input end of the cold medium heat exchange pipe on the evaporator side through a throttle valve, and the output end of the cold medium heat exchange pipe on the evaporator side is connected to the input end of the cold medium heat exchange pipe on the indoor unit heat exchanger side.

[0015] Preferably, the output end of the evaporator is connected to the input end of the second compressor, the output end of the second compressor is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the drying filter, and the output end of the drying filter is connected to the input end of the evaporator.

[0016] The present invention provides a cooling capacity recovery compensation system suitable for a multi-split heat pump, which has the following advantages:

[0017] By providing a cold recovery circulation component, the throttle valve automatically adjusts the opening according to the temperature sensor memorizing the target temperature setting value of the refrigerator. The cold medium absorbs the cold released by the indoor unit heat exchanger to reduce the refrigerant temperature, thereby achieving the purpose of refrigeration and preservation of food. The throttle valve opening is used to adjust the heat exchange flow rate to achieve the purpose of assisting the refrigerator in refrigeration and preservation, realizing the function of the system to facilitate temperature adjustment, thereby improving the applicability of the cold recovery compensation system suitable for multi-split heat pumps when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system flow of the present invention.

[0019] Explanation of the reference numerals in the figure: 1. Indoor unit heat exchanger; 2. Economizer; 3. Heat sink; 4. First filter; 5. Outdoor unit heat exchanger; 6. Four-way reversing valve; 7. Flash evaporator; 8. First compressor; 9. Liquid storage tank; 10. Oil separator; 11. Cold recovery cycle component; 12. Evaporator; 13. Condenser; 14. Dry filter; 15. Second compressor; 16. Cold medium heat exchange pipeline; a. Indoor unit electronic expansion valve; b. First electronic expansion valve; c. Outdoor unit main expansion valve; d. Outdoor unit auxiliary expansion valve; e. Second electronic expansion valve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a cold recovery compensation system suitable for a multi-split heat pump, comprising a heat multi-split pump system, a cold recovery cycle component 11 and a refrigerated cabinet component;

[0022] The multi-split pump system is composed of the following connections: the output end of the indoor unit heat exchanger 1 is connected to the economizer 2, the output ends of the economizer 2 are respectively connected to the heat sink 3 and the flash evaporator 7, the output end of the heat sink 3 is connected to the first filter 4, the output end of the first filter 4 is connected to the outdoor unit heat exchanger 5, the output end of the outdoor unit heat exchanger 5 is connected to the four-way reversing valve 6, the first flow path of the flash evaporator 7 is connected to the first compressor 8, the second flow path of the flash evaporator 7 is connected to the liquid storage 9, the output end of the first compressor 8 is connected to the oil separator 10, the output end of the indoor unit heat exchanger 1 is connected to the indoor unit electronic expansion valve a, the output end of the economizer 2 is connected to the outdoor unit heat exchanger 5, the output end of the outdoor unit heat exchanger 5 ... The input end is connected with a first electronic expansion valve b, the heat sink 3 and the first filter 4 are respectively connected with an outdoor main expansion valve c and an outdoor auxiliary expansion valve d, the outdoor heat exchanger 5 is connected with a liquid reservoir 9 through a four-way reversing valve 6, the flash evaporator 7 and the liquid reservoir 9 are connected with a second electronic expansion valve e, the output end of the liquid reservoir 9 is connected with the input end of the first compressor 8, the first flow path of the oil separator 10 is connected with the indoor heat exchanger 1 through the four-way reversing valve 6, the four-way reversing valve 6 and the indoor heat exchanger 1 are connected through the first filter 4, and the second flow path of the oil separator 10 is connected with the first compressor 8;

[0023] The refrigerator comprises: an evaporator 12, a second compressor 15, a condenser 13, a drying filter 14 located inside the cabinet, and a temperature sensor installed on the inner wall of the cabinet, the output end of the evaporator 12 is connected to the input end of the second compressor 15, the output end of the second compressor 15 is connected to the input end of the condenser 13, the output end of the condenser 13 is connected to the input end of the drying filter 14, and the output end of the drying filter 14 is connected to the input end of the evaporator 12;

[0024] The cold recovery cycle component 11 includes a cold medium heat exchange pipe 16 and a throttle valve. Two groups of cold medium heat exchange pipes 16 are provided. One group of cold medium heat exchange pipes 16 is located on one side of the indoor unit heat exchanger 1, and the other group of cold medium heat exchange pipes 16 is located on one side of the evaporator 12. The output end of the cold medium heat exchange pipe 16 on the side of the indoor unit heat exchanger 1 is connected to the input end of the cold medium heat exchange pipe 16 on the side of the evaporator 12 through the throttle valve, and the output end of the cold medium heat exchange pipe 16 on the side of the evaporator 12 is connected to the input end of the cold medium heat exchange pipe 16 on the side of the indoor unit heat exchanger 1.

[0025] When the indoor heat exchanger 1 is in cooling mode, the low-temperature, low-pressure liquid refrigerant enters the indoor heat exchanger 1 after throttling and decompression. At this time, the indoor air temperature is higher than the refrigerant temperature. The heavy copper tube of the heat exchanger serves as a passage for the refrigerant. The liquid refrigerant flows in the copper tube. Due to the temperature difference, heat is transferred from the indoor air to the copper tube through the aluminum fins. The aluminum fins increase the heat exchange area and play a key role in enhancing heat transfer. Driven by the indoor unit fan, the air continuously flows through the aluminum fins and the surface of the copper tube. After the heat is transferred to the refrigerant, the liquid refrigerant begins to absorb heat and gradually vaporizes. As the vaporization process proceeds, the temperature of the refrigerant will also rise. However, as long as its temperature is still lower than the indoor air temperature, heat will continue to be absorbed. Finally, the gaseous refrigerant leaves the indoor unit heat exchanger 1 and is compressed for the next cycle. In the heating mode, the flow direction of the refrigerant is changed by the four-way reversing valve 6. At this time, the high-temperature and high-pressure gaseous refrigerant enters the indoor unit heat exchanger 1. The indoor fan blows the heated air into the room to increase the indoor temperature. As the refrigerant continuously releases heat, its own state will gradually change from gas to liquid, and then flow to the outdoor unit heat exchanger 5 through the pipeline for subsequent circulation.

[0026] When the outdoor unit heat exchanger 5 is in cooling mode, the high-temperature, high-pressure gaseous refrigerant flowing out of the indoor unit evaporator enters the outdoor unit heat exchanger 5. At this time, the outdoor unit heat exchanger 5 acts as a condenser. The gaseous refrigerant flows in the copper tube. Since its temperature is higher than the outdoor air temperature, the heat will be transferred from the refrigerant to the copper tube. The aluminum fins quickly dissipate the heat of the copper tube to the surrounding air. The fan of the outdoor unit forces the air to flow through the aluminum fins and the copper tube surface to accelerate the heat dissipation. In this process, the gaseous refrigerant gradually cools and liquefies, completing the process. The heat released from the transition from gas to liquid is taken away by the outdoor air. In the heating mode, the outdoor unit heat exchanger 5 acts as an evaporator, and the liquid refrigerant from the indoor unit condenser (at this time, the indoor unit heat exchanger 1 acts as a condenser) enters the outdoor unit heat exchanger 5 under the action of pressure difference. Since the temperature of the liquid refrigerant is lower than the outdoor air temperature, the heat of the outdoor air will be transferred to the refrigerant through the aluminum fins and copper tubes. After absorbing the heat, the refrigerant gradually vaporizes, and then returns to the indoor unit heat exchanger 1 for the next round of heating cycle.

[0027] Economizer 2 absorbs heat through the throttling evaporation of the refrigerant itself, thereby supercooling another part of the refrigerant to improve the efficiency of the refrigeration cycle. The refrigerant entering economizer 2 is further cooled in economizer 2. In this process, a part of the refrigerant is throttled by the throttling device and evaporates, absorbing the heat of the surrounding high-pressure liquid refrigerant and evaporating into medium-pressure gas, which is then sucked into the middle air supply port of the first compressor 8 to participate in the subsequent compression process. At the same time, the heat absorbed by the evaporated refrigerant causes another part of the refrigerant to be supercooled, that is, its temperature is further reduced and the enthalpy value is correspondingly reduced.

[0028] When the flash evaporator 7 allows the high-pressure saturated liquid to enter the low-pressure space in the flash evaporator 7 through a throttling device such as a pressure reducing valve, the pressure of the liquid decreases rapidly, causing its boiling point to drop below the current temperature. Part of the liquid will rapidly vaporize into steam, while the remaining liquid will become a saturated liquid under the low pressure until both the liquid and the steam reach a saturated state under the pressure.

[0029] In the heating mode, the refrigerant in the indoor unit heat exchanger 1 passes through the indoor unit electronic expansion valve a, the economizer 2, the heat sink 3, the outdoor unit main expansion valve c, the outdoor unit auxiliary expansion valve d, and the first filter 4 in sequence during the process of the refrigerant reaching the outdoor unit heat exchanger 5. The process can be throttled by the indoor unit electronic expansion valve a as the main and the outdoor unit main expansion valve c as the auxiliary, or by the indoor unit electronic expansion valve a as the auxiliary and the outdoor unit main expansion valve c as the main. The refrigerant in the outdoor unit heat exchanger 5 passes through the liquid storage tank 9, the first compressor 8, the oil separator 10, and the first filter 4 in sequence during the process of reaching the indoor unit heat exchanger 1, which respectively play the role of gas-liquid separation, isentropic compression, separation of gaseous refrigerant and lubricating oil, and filtering impurities.

[0030] The system can independently set and adjust multiple rooms based on different demands for heat and humidity loads, making it the first choice for most families today. As a trend in the use of multi-split heat pump air conditioners in large building groups, it is easier to achieve the centralized recovery of cold and heat.

[0031] The throttle valve automatically adjusts its opening according to the target temperature setting value of the refrigerator temperature memorized by the temperature sensor. The cold medium absorbs the cold released by the indoor unit heat exchanger 1 to reduce the temperature of the refrigerant, thereby achieving the purpose of refrigeration and preservation of food. The throttle valve opening is used to adjust the heat exchange flow rate to achieve the purpose of assisting the refrigerator in refrigeration and preservation.

[0032] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cold recovery compensation system suitable for a multi-split heat pump, comprising a heat multi-split pump system, a cold recovery cycle component (11) and a refrigerated cabinet component; The multi-split pump system is connected as follows: the output end of the indoor unit heat exchanger (1) is connected to the economizer (2), the output end of the economizer (2) is respectively connected to the heat sink (3) and the flash evaporator (7), the output end of the heat sink (3) is connected to the first filter (4), the output end of the first filter (4) is connected to the outdoor unit heat exchanger (5), the output end of the outdoor unit heat exchanger (5) is connected to the four-way reversing valve (6), the first flow path of the flash evaporator (7) is connected to the first compressor (8), the second flow path of the flash evaporator (7) is connected to the liquid storage device (9), and the output end of the first compressor (8) is connected to the oil separator (10); Refrigerator composition: The evaporator (12), the second compressor (15), the condenser (13), the drying filter (14) and the inner wall of the cabinet are provided with temperature sensors; Features: The cold recovery cycle component (11) comprises a cold medium heat exchange pipeline (16) and a throttle valve.

2. A cooling capacity recovery compensation system suitable for a multi-split heat pump according to claim 1, characterized in that: The output end of the indoor unit heat exchanger (1) is connected to an indoor unit electronic expansion valve (a), the input end of the economizer (2) is connected to a first electronic expansion valve (b), and the heat sink (3) and the first filter (4) are respectively connected to an outdoor unit main expansion valve (c) and an outdoor unit auxiliary expansion valve (d).

3. The cold recovery compensation system for a multi-split heat pump according to claim 1, characterized in that: The outdoor unit heat exchanger (5) is connected to the liquid storage tank (9) via a four-way reversing valve (6), and a second electronic expansion valve (e) is connected between the flash evaporator (7) and the liquid storage tank (9).

4. The cold recovery compensation system applicable to a multi-split heat pump according to claim 1, characterized in that: The output end of the liquid storage device (9) is connected to the input end of the first compressor (8), the first flow path of the oil separator (10) is connected to the indoor unit heat exchanger (1) through the four-way reversing valve (6), the four-way reversing valve (6) and the indoor unit heat exchanger (1) are connected through the first filter (4), and the second flow path of the oil separator (10) is connected to the first compressor (8).

5. The cold recovery compensation system applicable to a multi-split heat pump according to claim 1, characterized in that: The cold medium heat exchange pipes (16) are provided in two groups, one group of the cold medium heat exchange pipes (16) is located on one side of the indoor unit heat exchanger (1), and the other group of the cold medium heat exchange pipes (16) is located on one side of the evaporator (12).

6. The cold recovery compensation system applicable to a multi-split heat pump according to claim 5, characterized in that: The output end of the cold medium heat exchange pipe (16) on one side of the indoor unit heat exchanger (1) is connected to the input end of the cold medium heat exchange pipe (16) on one side of the evaporator (12) through a throttle valve, and the output end of the cold medium heat exchange pipe (16) on one side of the evaporator (12) is connected to the input end of the cold medium heat exchange pipe (16) on one side of the indoor unit heat exchanger (1).

7. The cold recovery compensation system applicable to a multi-split heat pump according to claim 1, characterized in that: The output end of the evaporator (12) is connected to the input end of the second compressor (15), the output end of the second compressor (15) is connected to the input end of the condenser (13), the output end of the condenser (13) is connected to the input end of the drying filter (14), and the output end of the drying filter (14) is connected to the input end of the evaporator (12).

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