A heat pump air conditioning system with double regenerative pipe type heat storage

Abstract

The utility model discloses a kind of double heat storage pipe type heat storage heat pump air conditioning systems, and disclosed with a double heat storage pipe type heat storage heat pump air conditioning system, can be continuously heated to indoor when defrosting, improve user experience.A kind of double heat storage pipe type heat storage heat pump air conditioning system includes main system and heat storage system.Main system includes the compressor, four-way valve, indoor heat exchanger, first electronic expansion valve, first solenoid valve, second electronic expansion valve, outdoor heat exchanger, three-way valve and gas-liquid separator connected in sequence.Heat storage system includes first heat storage cycle, second heat storage cycle and heat accumulator, and heat accumulator includes first heat storage pipe and second heat storage pipe.In system heating, phase change heat storage is carried out by heat storage system, and thermal energy is stored in heat accumulator, when system needs defrosting, auxiliary defrosting is carried out by thermal energy in heat accumulator, and then avoid the indoor temperature fluctuation caused by that all thermal energy is output to outdoor heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning system technology, and in particular to an air conditioning system with dual heat storage pipes and heat storage type heat pump. Background Technology

[0002] When a residential heat pump is operating in winter, the outdoor heat exchanger frosts due to its low evaporation temperature, reducing its heat exchange capacity and significantly diminishing its heating effect. Therefore, defrosting is necessary after a period of operation. Traditional heat pump defrosting typically uses a reverse circulation method, changing the refrigerant flow so that the refrigerant discharged from the compressor first defrosts the outdoor heat exchanger, then flows into the indoor heat exchanger, and finally returns to the compressor. During defrosting, because the indoor heat exchanger pipe temperature is low, the indoor heat exchanger fan remains off to prevent cold air from blowing out and causing user discomfort. Therefore, no heat is supplied to the indoor heat exchanger during defrosting, which can easily cause room temperature fluctuations and affect user comfort. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a dual-heat storage tube heat pump air conditioning system that can continuously provide indoor heating during defrosting, thereby improving the user experience.

[0004] A heat pump air conditioning system with dual heat storage pipes according to an embodiment of the present invention includes a main system. The main system includes a compressor, a four-way valve, an indoor heat exchanger, a first electronic expansion valve, a first solenoid valve, a second electronic expansion valve, an outdoor heat exchanger, a three-way valve, and a gas-liquid separator connected in sequence. The four-way valve includes a first valve port, a second valve port, a third valve port, and a fourth valve port. The first valve port is connected to the indoor heat exchanger, the second valve port is connected to the input end of the gas-liquid separator, the third valve port is connected to the three-way valve, and the fourth valve port is connected to the output end of the compressor. The three-way valve includes a fifth valve port, a sixth valve port, and a seventh valve port. The fifth valve port is connected to the third valve port, the sixth valve port is connected to the outdoor heat exchanger, and the seventh valve port is connected to the compressor. The system connects the first valve port to the indoor heat exchanger and includes a heat storage system comprising a first heat storage cycle, a second heat storage cycle, and a heat storage device. The heat storage device includes a first heat storage tube and a second heat storage tube. One end of the first heat storage cycle is connected to the output end of the compressor, and the other end is connected to the output end or input end of the indoor heat exchanger. The first heat storage cycle stores some heat energy in the heat storage device during heating and releases heat energy into the circulating refrigerant to assist in defrosting during defrosting. One end of the second heat storage cycle is connected to the output end of the compressor, and the other end is connected to the output end or input end of the indoor heat exchanger. The second heat storage cycle stores some heat energy in the heat storage device during heating and releases heat energy into the circulating refrigerant to assist in defrosting during defrosting.

[0005] It has at least the following beneficial effects: When the system is heating, phase change heat storage is carried out through the heat storage system, and the heat energy is stored in the heat storage tank. When the system needs to defrost, the heat energy in the heat storage tank is used to assist in defrosting, thereby avoiding indoor temperature fluctuations caused by all the heat energy being output to the outdoor heat exchanger, and improving the user experience.

[0006] According to some embodiments of the present invention, the first heat storage cycle includes a first pipe, a second solenoid valve, a second pipe and a third solenoid valve. One end of the first pipe is connected to the input end of the gas-liquid separator and the other end is connected to one end of the first heat storage tube. The second solenoid valve is disposed on the first pipe. One end of the second pipe is connected to the other end of the first heat storage tube. The other end of the second pipe is connected between the first valve port and the indoor heat exchanger. The third solenoid valve is disposed on the second pipe.

[0007] According to some embodiments of this utility model, the second heat storage cycle includes a third pipe, a fourth pipe, a first bridge pipe, a fourth solenoid valve, a second bridge pipe, and a fifth solenoid valve. One end of the third pipe is connected between the second solenoid valve and the first heat storage tube, and the other end of the third pipe is connected to one end of the second heat storage tube. One end of the fourth pipe is connected to the other end of the second heat storage tube, and the other end of the fourth pipe is connected between the first solenoid valve and the second electronic expansion valve. The fourth solenoid valve is disposed on the fourth pipe. The two ends of the first bridge pipe are respectively connected to the output end of the compressor and the third pipe. The fifth solenoid valve is disposed on the first bridge pipe. One end of the second bridge pipe is connected to the end of the fourth pipe near the second heat storage tube, and the other end of the second bridge pipe is connected to the end of the second pipe near the first heat storage tube.

[0008] According to some embodiments of the present invention, the first heat storage cycle further includes a third bridge pipe and a sixth solenoid valve. One end of the third bridge pipe is connected to the end of the second pipe near the first heat storage pipe, and the other end of the third bridge pipe is connected between the first electronic expansion valve and the first solenoid valve.

[0009] According to some embodiments of this utility model, during heating, the first valve port is connected to the fourth valve port, the second valve port is connected to the third valve port, the fifth valve port is connected to the sixth valve port, the seventh valve port is closed, the first solenoid valve is opened, and the fourth solenoid valve and the sixth solenoid valve are closed.

[0010] According to some embodiments of this utility model, during defrosting, the first valve port is connected to the fourth valve port, the second valve port is connected to the third valve port, the sixth valve port and the seventh valve port are connected, the fifth valve port is closed, the first solenoid valve is closed, and the fourth solenoid valve and the sixth solenoid valve are open.

[0011] According to some embodiments of this utility model, during the heat storage process, when the phase change temperature inside the heat storage device is lower than the first temperature K1 and there is a temperature difference K2 with the exhaust gas of the compressor, the fifth solenoid valve and the third solenoid valve are opened and the second solenoid valve is closed.

[0012] According to some embodiments of this utility model, when the phase change material in the heat accumulator reaches saturation, only the first solenoid valve is opened, while all other solenoid valves are closed.

[0013] According to some embodiments of this utility model, the heat accumulator uses n-octadecane as a phase change material.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0016] Figure 1 This is a system diagram of the heating mode in an embodiment of the present invention;

[0017] Figure 2 This is a system diagram of the defrosting mode in an embodiment of the present invention. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are 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, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Reference Figure 1 and Figure 2 This utility model discloses a heat pump air conditioning system with dual heat storage pipes, including a main system 100 and a heat storage system 200. The main system 100 includes a compressor 110, a four-way valve 120, an indoor heat exchanger 130, a first electronic expansion valve 140, a first solenoid valve 150, a second electronic expansion valve 160, an outdoor heat exchanger 170, a three-way valve 180, and a gas-liquid separator 190, connected in sequence.

[0022] The four-way valve 120 includes a first valve port a, a second valve port b, a third valve port c, and a fourth valve port d. The first valve port a is connected to the indoor heat exchanger 130, the second valve port b is connected to the input end of the gas-liquid separator 190, the third valve port c is connected to the three-way valve 180, and the fourth valve port d is connected to the output end of the compressor 110.

[0023] The three-way valve 180 includes a fifth valve port e, a sixth valve port f, and a seventh valve port g. The fifth valve port e is connected to the third valve port c, the sixth valve port f is connected to the outdoor heat exchanger 170, and the seventh valve port g is connected between the first valve port a and the indoor heat exchanger 130.

[0024] It also includes a heat storage system 200, which includes a first heat storage cycle 210, a second heat storage cycle 220, and a heat storage device 230, which includes a first heat storage tube 231 and a second heat storage tube 232.

[0025] One end of the first heat storage cycle 210 is connected to the output end of the compressor 110, and the other end is connected to the output or input end of the indoor heat exchanger 130. The first heat storage cycle 210 is used to store part of the heat energy in the heat storage unit 230 when heating, and to release the heat energy into the circulating refrigerant to assist defrosting when defrosting.

[0026] The second heat storage cycle 220 is connected at one end to the output end of the compressor 110 and at the other end to the output or input end of the indoor heat exchanger 130. The second heat storage cycle 220 is used to store part of the heat energy in the heat storage tank 230 when heating and to release the heat energy into the circulating refrigerant to assist defrosting when defrosting.

[0027] The first heat storage cycle 210 includes a first pipe 211, a second solenoid valve 212, a second pipe 213, and a third solenoid valve 214. One end of the first pipe 211 is connected to the input end of the gas-liquid separator 190, and the other end is connected to one end of the first heat storage tube 231. The second solenoid valve 212 is installed on the first pipe 211. One end of the second pipe 213 is connected to the other end of the first heat storage tube 231, and the other end of the second pipe 213 is connected between the first valve port a and the indoor heat exchanger 130. The third solenoid valve 214 is installed on the second pipe 213.

[0028] The second heat storage cycle 220 includes a third pipe 221, a fourth pipe 222, a first bridge pipe 223, a fourth solenoid valve 224, a second bridge pipe 225, and a fifth solenoid valve 226. One end of the third pipe 221 is connected between the second solenoid valve 212 and the first heat storage tube 231, and the other end of the third pipe 221 is connected to one end of the second heat storage tube 232. One end of the fourth pipe 222 is connected to the other end of the second heat storage tube 232, and the other end of the fourth pipe 222 is connected between the first solenoid valve 150 and the second electronic expansion valve 160. The fourth solenoid valve 224 is installed on the fourth pipe 222. The two ends of the first bridge pipe 223 are respectively connected to the output end of the compressor 110 and the third pipe 221. The fifth solenoid valve 226 is installed on the first bridge pipe 223. One end of the second bridge pipe 225 is connected to the end of the fourth pipe 222 near the second heat storage tube 232, and the other end of the second bridge pipe 225 is connected to the end of the second pipe 213 near the first heat storage tube 231.

[0029] The first heat storage cycle 210 also includes a third bridge pipe 215 and a sixth solenoid valve 216. One end of the third bridge pipe 215 is connected to the end of the second pipe 213 near the first heat storage pipe 231, and the other end of the third bridge pipe 215 is connected between the first electronic expansion valve 140 and the first solenoid valve 150.

[0030] It is understood that in this utility model, when the system is heating, phase change heat storage is performed through the heat storage system 200 to store the heat energy in the heat storage unit 230. When the system needs to defrost, the heat energy in the heat storage unit 230 is used to assist in defrosting, thereby avoiding all the heat energy being output to the outdoor heat exchanger 170 and causing indoor temperature fluctuations, thus improving the user experience.

[0031] Reference Figure 2 In an embodiment of this utility model, during heating, the first valve port a is connected to the fourth valve port d, the second valve port b is connected to the third valve port c, the fifth valve port e and the sixth valve port f are connected, the seventh valve port g is closed, the first solenoid valve 150 is opened, and the fourth solenoid valve 224 and the sixth solenoid valve 216 are closed.

[0032] Understandably, in heating mode, the refrigerant sequentially passes through compressor 110, four-way valve 120, indoor heat exchanger 130, first electronic expansion valve 140, first solenoid valve 150, second electronic expansion valve 160, outdoor heat exchanger 170, and three-way valve 180, finally returning to compressor 110 to complete the cycle. This flow control ensures that during heating, the refrigerant can effectively release heat indoors and absorb heat outdoors, achieving efficient heating.

[0033] Reference Figure 1 and Figure 2 In an embodiment of this utility model, during defrosting, the first valve port a is connected to the fourth valve port d, the second valve port b is connected to the third valve port c, the sixth valve port f and the seventh valve port g are connected, the fifth valve port e is closed, the first solenoid valve 150 is closed, and the fourth solenoid valve 224 and the sixth solenoid valve 216 are open.

[0034] In defrost mode, the first solenoid valve 150 is closed, while the fourth solenoid valve 224 and the sixth solenoid valve 216 are opened, creating a branch flow. A portion of the high-temperature, high-pressure gaseous refrigerant flows into the indoor heat exchanger 130 for heating, while the other portion flows through the branch of the three-way valve 180 to the outdoor heat exchanger 170 for defrosting. The medium-temperature, high-pressure liquid refrigerant flowing from the indoor heat exchanger 130 is throttled and depressurized by the first electronic expansion valve 140 before entering the heat storage tank 230 via the sixth solenoid valve 216. Similarly, the medium-temperature, high-pressure liquid refrigerant flowing from the outdoor heat exchanger 170 is throttled and depressurized by the second electronic expansion valve 160 before entering the heat storage tank 230 via the fourth solenoid valve 224. This achieves a rational distribution and utilization of heat, ensuring both effective defrosting and maintaining basic indoor heating.

[0035] Reference Figure 1 and Figure 2 During the heat storage process, when the internal phase change temperature of the heat storage unit 230 is lower than the first temperature K1 and there is a temperature difference K2 between it and the exhaust gas of the compressor 110, the fifth solenoid valve 226 and the third solenoid valve 214 are opened and the second solenoid valve 212 is closed.

[0036] It should be noted that during the heat storage process, the system is in heating mode, the fifth solenoid valve 226 and the third solenoid valve 214 are opened and the second solenoid valve 212 is closed, and part of the refrigerant in the main system 100 enters the heat storage tank 230 for heat storage through the first heat storage cycle 210 and the second heat storage cycle 220.

[0037] In defrost mode, the heat storage unit 230 outputs heat energy to the main system 100 through the first heat storage cycle 210 and the second heat storage cycle 220 for auxiliary heating, thus avoiding a sudden drop in indoor temperature.

[0038] It should be noted that the first temperature K1 and the temperature difference K2 can be set by those skilled in the art according to design requirements. In some embodiments of this utility model, the first temperature K1 is 28 degrees Celsius, and the temperature difference K2 is 10-15 degrees Celsius.

[0039] It is worth noting that in some embodiments of this utility model, when the phase change material in the heat storage 230 reaches saturation, only the first solenoid valve 150 is opened, and all other solenoid valves are closed.

[0040] Understandably, the start and stop of the heat storage process are determined based on the temperature difference between the phase change temperature inside the heat accumulator 230 and the exhaust temperature of the compressor 110. When the temperature difference reaches 10℃-15℃, the heat exchange effect is significant, and the heat storage process is initiated. When the temperature difference is less than 5℃, the heat transfer rate becomes very low, and the heat accumulator 230 can be considered to be approaching or reaching saturation, at which point the heat storage process stops. This intelligent control method based on temperature difference can fully utilize the heat from the compressor exhaust, avoid energy waste, and improve the system's energy efficiency.

[0041] It should be noted that in some embodiments of this utility model, the heat accumulator 230 uses n-octadecane as the phase change material.

[0042] It is understandable that n-octadecane was chosen as the phase change material, as its melting point is about 28°C, which provides a suitable phase change temperature range.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A heat pump air conditioning system with dual heat storage pipes, characterized in that, include: The main system (100) includes a compressor (110), a four-way valve (120), an indoor heat exchanger (130), a first electronic expansion valve (140), a first solenoid valve (150), a second electronic expansion valve (160), an outdoor heat exchanger (170), a three-way valve (180), and a gas-liquid separator (190) connected in sequence. The four-way valve (120) includes a first valve port (a), a second valve port (b), a third valve port (c), and a fourth valve port (d). The first valve port (a) is connected to the indoor heat exchanger (130), the second valve port (b) is connected to the input end of the gas-liquid separator (190), the third valve port (c) is connected to the three-way valve (180), and the fourth valve port (d) is connected to the output end of the compressor (110). The three-way valve (180) includes a fifth valve port (e), a sixth valve port (f) and a seventh valve port (g). The fifth valve port (e) is connected to the third valve port (c). The sixth valve port (f) is connected to the outdoor heat exchanger (170). The seventh valve port (g) is connected between the first valve port (a) and the indoor heat exchanger (130). It also includes a heat storage system (200), which includes a first heat storage cycle (210), a second heat storage cycle (220), and a heat storage device (230), which includes a first heat storage tube (231) and a second heat storage tube (232). One end of the first heat storage cycle (210) is connected to the output end of the compressor (110), and the other end is connected to the output or input end of the indoor heat exchanger (130). The first heat storage cycle (210) is used to store part of the heat energy in the heat storage unit (230) when heating, and to release the heat energy into the circulating refrigerant to assist defrosting when defrosting. One end of the second heat storage cycle (220) is connected to the output end of the compressor (110), and the other end is connected to the output or input end of the indoor heat exchanger (130). The second heat storage cycle (220) is used to store part of the heat energy in the heat storage unit (230) when heating, and to release the heat energy into the circulating refrigerant to assist defrosting when defrosting.

2. The heat pump air conditioning system with dual heat storage pipes according to claim 1, characterized in that, The first heat storage cycle (210) includes a first pipe (211), a second solenoid valve (212), a second pipe (213), and a third solenoid valve (214). One end of the first pipe (211) is connected to the input end of the gas-liquid separator (190), and the other end is connected to one end of the first heat storage tube (231). The second solenoid valve (212) is installed on the first pipe (211). One end of the second pipe (213) is connected to the other end of the first heat storage tube (231), and the other end of the second pipe (213) is connected between the first valve port (a) and the indoor heat exchanger (130). The third solenoid valve (214) is installed on the second pipe (213).

3. The heat pump air conditioning system with dual heat storage pipes according to claim 2, characterized in that, The second heat storage cycle (220) includes a third pipe (221), a fourth pipe (222), a first bridge pipe (223), a fourth solenoid valve (224), a second bridge pipe (225), and a fifth solenoid valve (226). One end of the third pipe (221) is connected between the second solenoid valve (212) and the first heat storage tube (231), and the other end of the third pipe (221) is connected to one end of the second heat storage tube (232). One end of the fourth pipe (222) is connected to the other end of the second heat storage tube (232), and the other end of the fourth pipe (222) is connected to the first solenoid valve (226). Between the first electronic expansion valve (110) and the second electronic expansion valve (160), the fourth solenoid valve (224) is disposed on the fourth pipe (222), the two ends of the first bridge pipe (223) are respectively connected to the output end of the compressor (110) and the third pipe (221), the fifth solenoid valve (226) is disposed on the first bridge pipe (223), one end of the second bridge pipe (225) is connected to the end of the fourth pipe (222) near the second heat storage pipe (232), and the other end of the second bridge pipe (225) is connected to the end of the second pipe (213) near the first heat storage pipe (231).

4. A heat pump air conditioning system with dual heat storage pipes according to claim 3, characterized in that, The first heat storage cycle (210) also includes a third bridge pipe (215) and a sixth solenoid valve (216). One end of the third bridge pipe (215) is connected to the end of the second pipe (213) near the first heat storage pipe (231), and the other end of the third bridge pipe (215) is connected between the first electronic expansion valve (140) and the first solenoid valve (150).

5. A dual-heat-storage tube heat pump air conditioning system according to claim 4, characterized in that, When heating, the first valve port (a) is connected to the fourth valve port (d), the second valve port (b) is connected to the third valve port (c), the fifth valve port (e) and the sixth valve port (f) are connected, the seventh valve port (g) is closed, the first solenoid valve (150) is opened, and the fourth solenoid valve (224) and the sixth solenoid valve (216) are closed.

6. A dual-heat-storage tube heat pump air conditioning system according to claim 4, characterized in that, During defrosting, the first valve port (a) is connected to the fourth valve port (d), the second valve port (b) is connected to the third valve port (c), the sixth valve port (f) and the seventh valve port (g) are connected, the fifth valve port (e) is closed, the first solenoid valve (150) is closed, and the fourth solenoid valve (224) and the sixth solenoid valve (216) are open.

7. A dual-heat-storage tube heat pump air conditioning system according to claim 5, characterized in that, During the heat storage process, when the phase change temperature inside the heat storage unit (230) is lower than the first temperature K1 and there is a temperature difference K2 with the exhaust gas of the compressor (110), the fifth solenoid valve (226) and the third solenoid valve (214) are opened and the second solenoid valve (212) is closed.

8. A heat pump air conditioning system with dual heat storage pipes according to claim 7, characterized in that, When the phase change material in the heat storage device (230) reaches saturation, only the first solenoid valve (150) is opened, and all other solenoid valves are closed.

9. A heat pump air conditioning system with dual heat storage pipes according to claim 1, characterized in that, The heat accumulator (230) uses n-octadecane as the phase change material.

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