Liquid storage structure for improving system capacity

Abstract

The utility model belongs to the technical field of heat pumps, and particularly relates to a liquid storage structure capable of improving system capacity, which comprises an exhaust port, an outdoor heat exchanger, a second inlet, an indoor heat exchanger, a gas-liquid separator, a liquid storage tank and a second one-way valve. One end of the outdoor heat exchanger communicates with one end of the four-way reversing valve, the interior of the four-way reversing valve communicates with a second communicating port, the other end of the outdoor heat exchanger communicates with the first port, the outdoor heat exchanger communicates with one end of the drying filter, and the other end of the drying filter communicates with the first inlet. One end of the liquid storage tank is communicated with the through hole, the other end of the liquid storage tank is communicated with the second outlet, a second inlet is formed in the other side of the second outlet, and the second outlet is communicated with the second port; the working capacity can be improved through refrigeration circulation and heating circulation, and the situation that the degree of supercooling is lost due to the fact that a conventional system is singly provided with a liquid storage tank is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a liquid storage structure for improving system capacity. Background Art

[0002] Refrigeration and heat pump units can achieve cooling in summer and heating in winter through compressors, condensers, evaporators, and throttling mechanisms. In the process of achieving dual cooling and heating, heat pump units usually use a four-way reversing valve to achieve the change of refrigerant flow direction. However, both experiments and theoretical studies have shown that there is a difference in the refrigerant flow rate of air source heat pump systems under cooling conditions and heating conditions. Generally, the refrigerant flow rate under cooling conditions is higher than that under heating conditions. Usually, a liquid storage tank is added to the design of the heat pump system to balance the refrigerant volume under cooling and heating. However, this solution will sacrifice part of the system's capacity under cooling conditions, so it can be improved.

[0003] Therefore, in view of the above problems, a liquid storage structure is proposed to improve the system capacity. Summary of the invention

[0004] In order to make up for the shortcomings of the existing technology, the air source heat pump can store different amounts of refrigerant in cooling and heating conditions, and avoid the loss of supercooling in the liquid storage tank during cooling. This design allows the heat pump system to avoid the loss of supercooling during cooling, reduce the cooling capacity, reduce supercooling during heating, and reduce outdoor heat absorption, which is equivalent to reducing the heat load, which is conducive to improving the cooling and heating capabilities of the system.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a liquid storage structure for improving system capacity described in the utility model includes an exhaust port, an outdoor heat exchanger, a second inlet, an indoor heat exchanger, a gas-liquid separator, a liquid storage tank, and a second one-way valve, wherein the exhaust port is connected to a third connecting port, one end of the outdoor heat exchanger is connected to one end of a four-way reversing valve, and the interior of the four-way reversing valve is connected to the second connecting port, and the other end of the outdoor heat exchanger is connected to the first port, the outdoor heat exchanger is connected to one end of a drying filter, and the other end of the drying filter is connected to the first inlet, one end of the liquid storage tank is connected to a through hole, and the liquid storage tank The other end is connected to the second outlet, and the other side of the second outlet is provided with a second inlet, the second outlet is connected to the second port, the other port of the second inlet is connected to the first outlet, one end of the second one-way valve is connected to the third port, and the other port of the second one-way valve is connected to the first outlet, one end of the indoor heat exchanger is connected to the second port, and the other port of the indoor heat exchanger is connected to the fourth connecting port, one port of the gas-liquid separator is connected to the first connecting port, and the other port of the gas-liquid separator is connected to the compressor, an electronic expansion valve is provided on one side of the drying filter, and a first one-way valve is provided on the other side of the electronic expansion valve.

[0006] Preferably, the liquid storage capacity of the liquid storage tank is sixty percent of the mass of the refrigerant.

[0007] Preferably, the compressor is electrically connected to the liquid storage tank via a wire, and the liquid storage tank is electrically connected to the electronic expansion valve via a wire.

[0008] Preferably, the two ends of the liquid storage tank form a communication structure with the through hole and the second outlet, and the smaller the pressure drop of the liquid storage tank, the more obvious the effect of improving the system capacity.

[0009] Preferably, a refrigeration condition circulation loop structure is formed between the exhaust port, the third connecting port, the second connecting port, the outdoor heat exchanger, the drying filter, the electronic expansion valve, the first one-way valve, the indoor heat exchanger, the fourth connecting port, the first connecting port, the gas-liquid separator and the compressor suction port.

[0010] Preferably, a heating condition circulation loop structure is formed between the exhaust port, the third connecting port, the fourth connecting port, the indoor heat exchanger, the liquid storage tank, the second one-way valve, the electronic expansion valve, the drying filter, the outdoor heat exchanger, the second connecting port, the first connecting port, the gas-liquid separator and the compressor suction port.

[0011] The utility model is beneficial in that:

[0012] 1. The refrigeration cycle and heating cycle of the utility model can improve the working capacity, avoiding the situation where the conventional system only adds a liquid storage tank and causes the loss of supercooling;

[0013] 2. The utility model single expansion valve has the advantage of reducing costs, avoiding the mutual interference of multiple expansion valves, which makes the refrigerant flow of the outdoor heat exchanger uneven, causing some heat exchangers to fail to maximize heat exchange, resulting in the risk of reduced system energy efficiency, and makes the flow distribution before the outdoor heat exchanger more uniform, the pipeline is simple, and the control system development is simplified;

[0014] 3. The use of the one-way valve of the utility model simplifies the development difficulty of the system control part to the greatest extent. The conventional air source heat pump system can meet the control of the system, and two one-way valves are used to control the flow direction of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the connection structure of an air source heat pump device including the structural design provided in an embodiment of the utility model;

[0017] Figure 2 A refrigeration cycle schematic diagram of a self-defrosting jet enthalpy-increasing heat pump device provided in an embodiment of the utility model;

[0018] Figure 3 A heating cycle schematic diagram of a self-defrosting jet enthalpy-increasing heat pump device provided in an embodiment of the utility model.

[0019] In the figure: 1. compressor; 101. exhaust port; 2. four-way reversing valve; 201. first connecting port; 202. second connecting port; 203. third connecting port; 204. fourth connecting port; 3. outdoor heat exchanger; 4. drying filter; 401. first port; 5. electronic expansion valve; 501. first inlet; 502. first outlet; 6. first non-return valve; 601. second inlet; 602. second outlet; 7. indoor heat exchanger; 8. gas-liquid separator; 9. liquid storage tank; 901. second port; 902. third port; 10. second non-return valve; 1001. through hole. DETAILED DESCRIPTION

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

[0021] Embodiment 1

[0022] See also Figures 1 to 3As shown, a liquid storage structure for improving system capacity includes an exhaust port 101, an outdoor heat exchanger 3, a second inlet 601, an indoor heat exchanger 7, a gas-liquid separator 8, a liquid storage tank 9, and a second one-way valve 10, wherein the exhaust port 101 is connected to the third connecting port 203, one end of the outdoor heat exchanger 3 is connected to one end of the four-way reversing valve 2, and the interior of the four-way reversing valve 2 is connected to the second connecting port 202, and the other end of the outdoor heat exchanger 3 is connected to the first port 401, the outdoor heat exchanger 3 is connected to one end of the drying filter 4, and the other end of the drying filter 4 is connected to the first inlet 501, one end of the liquid storage tank 9 is connected to the through hole 1001, and the other end of the liquid storage tank 9 is connected to the second outlet 602, and A second inlet 601 is provided on the other side of the second outlet 602, the second outlet 602 is connected to the second port 901, the other port of the second inlet 601 is connected to the first outlet 502, one end of the second one-way valve 10 is connected to the third port 902, and the other port of the second one-way valve 10 is connected to the first outlet 502, one end of the indoor heat exchanger 7 is connected to the second port 901, and the other port of the indoor heat exchanger 7 is connected to the fourth connecting port 204, one port of the gas-liquid separator 8 is connected to the first connecting port 201, and the other port of the gas-liquid separator 8 is connected to the compressor 1, an electronic expansion valve 5 is provided on one side of the drying filter 4, and a first one-way valve 6 is provided on the other side of the electronic expansion valve 5.

[0023] The liquid storage capacity of the liquid storage tank 9 is 60% of the mass of the refrigerant; both the refrigeration cycle and the heating cycle can improve the working capacity, avoiding the situation in which the conventional system only adds the liquid storage tank 9 and causes the loss of supercooling.

[0024] The compressor 1 is electrically connected to the liquid storage tank 9 through a wire, and the liquid storage tank 9 is electrically connected to the electronic expansion valve 5 through a wire; thereby improving the practicability of the unit under the dual-mode requirements of cooling and heating. Through reasonable adjustment of the liquid storage tank and the expansion valve, the low pressure phenomenon caused by insufficient refrigerant circulation at the suction port of the compressor 1 when the unit is running is guaranteed, and the safe operation of the compressor 1 is guaranteed within a reasonable energy-saving range.

[0025] The two ends of the liquid storage tank 9 form a connecting structure with the through hole 1001 and the second outlet 602, and the smaller the pressure drop of the liquid storage tank 9, the more obvious the effect of improving the system capacity; the single expansion valve has the advantage of reducing costs, avoiding the mutual interference of multiple expansion valves, which makes the refrigerant diversion of the outdoor heat exchanger 3 uneven, causing some heat exchangers to fail to maximize heat exchange, resulting in the risk of reduced system energy efficiency, and makes the diversion before the outdoor heat exchanger 3 more uniform, the pipeline is simple, and the control system development is simplified.

[0026] In the heat pump system using this design, the liquid storage device is a liquid reservoir; the use of a one-way valve simplifies the development difficulty of the system control part to the greatest extent. A conventional air source heat pump system can meet the control of the system, and two one-way valves are used to control the flow direction of the loop.

[0027] A refrigeration condition circulation loop structure is formed between the exhaust port 101, the third connecting port 203, the second connecting port 202, the outdoor heat exchanger 3, the drying filter 4, the electronic expansion valve 5, the first non-return valve 6, the indoor heat exchanger 7, the fourth connecting port 204, the first connecting port 201, the gas-liquid separator 8 and the compressor suction port; thereby facilitating the compressor 1 to complete a refrigeration cycle and continue the next cycle.

[0028] A heating condition circulation loop structure is formed between the exhaust port 101, the third connecting port 203, the fourth connecting port 204, the indoor heat exchanger 7, the liquid storage tank 9, the second one-way valve 10, the electronic expansion valve 5, the drying filter 4, the outdoor heat exchanger 3, the second connecting port 202, the first connecting port 201, the gas-liquid separator 8 and the compressor suction port; it is conducive to completing a heating circuit cycle and continuing the next cycle.

[0029] Working principle: In the above-mentioned air source heat pump system device, a single compressor, a single four-way reversing valve 2, a single outdoor heat exchanger, two one-way valves, a single indoor heat exchanger, and a single electronic expansion valve are used to realize cooling, heating, and self-defrosting conditions. The cooling capacity and heating capacity of the unit cycle are improved by circulating the refrigerant flow path without passing through the liquid storage device in the cooling condition and through the liquid storage device in the heating condition, thereby improving the practicality of the unit under the dual-control requirements of cooling and heating. The reasonable adjustment of the liquid storage device and the expansion valve ensures the low pressure caused by insufficient refrigerant circulation at the suction port of the compressor 1 when the unit is running, and ensures the safe operation of the compressor 1 within a reasonable energy-saving range;

[0030] In this embodiment, for the refrigeration cycle, Figure 2As shown, the arrow in the figure points to the refrigerant circulation direction, and the refrigerant does not flow at the dotted line. The main path of the refrigeration cycle loop is connected in sequence according to the circulation direction: the refrigerant is compressed by the compressor 1 to become a high-temperature and high-pressure gas refrigerant, which is discharged through the exhaust port 101 of the compressor 1, and then flows through the third connecting port 203 of the four-way reversing valve 2 and the second connecting port 202 of the four-way reversing valve 2, and enters the outdoor heat exchanger 3, where it releases heat to the external environment and becomes a low-temperature and high-pressure liquid refrigerant, and then flows through the drying filter. 4 enters the electronic expansion valve 5, where it saves energy and reduces pressure to become a low-temperature and low-pressure two-phase refrigerant, then enters the indoor heat exchanger 7 through the first one-way valve 6, where it absorbs heat from the external environment to become a low-pressure and heated refrigerant, then enters the fourth connecting port 204 of the four-way reversing valve 2, flows out of the four-way reversing valve 2 through the first connecting port 201, enters the gas-liquid separator 8 for gas-liquid separation, then flows into the compressor 1 through the suction pipe to complete a refrigeration cycle, and continues the next cycle;

[0031] In this embodiment, the heating circuit is circulated, such as Figure 3 As shown, the heating cycle is connected in sequence according to the circulation direction: the refrigerant is compressed in the compressor 1 to become a high-temperature and high-pressure gaseous refrigerant, the refrigerant enters the exhaust pipe through the exhaust port 101, passes through the third connecting port 203 of the four-way reversing valve 2 and the fourth connecting port 204 of the four-way reversing valve 2 to enter the indoor heat exchanger 7, releases heat to the external environment at the indoor heat exchanger 7 to become a high-pressure and low-temperature liquid refrigerant, then passes through the liquid storage tank 9 and the second one-way valve 10, flows out of the second one-way valve 10 and enters the electronic expansion valve 5 for throttling and pressure reduction, and then the low-temperature and low-pressure refrigerant flows through the drying process The filter 4 enters the outdoor heat exchanger 3, absorbs external heat to increase the temperature at the outdoor heat exchanger 3, and then flows into the four-way reversing valve 2 through the second connecting port 202 and flows out of the first connecting port 201 to enter the gas-liquid separator 8 for gas-liquid separation. Finally, the low-pressure gas returns to the compressor 1, completing a heating circuit cycle and continuing the next cycle; the expansion valve in this embodiment is an electronic expansion valve 5 or a thermal expansion valve, more preferably an electronic expansion valve 5, and the indoor heat exchanger 7 in this embodiment is a plate heat exchanger, a shell and tube heat exchanger, a sleeve heat exchanger, or an air-to-air heat exchanger, more preferably a plate heat exchanger.

[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A liquid storage structure for improving system capacity, characterized in that: The invention comprises an exhaust port (101), an outdoor heat exchanger (3), a second inlet (601), an indoor heat exchanger (7), a gas-liquid separator (8), a liquid storage tank (9), and a second one-way valve (10); the exhaust port (101) is connected to a third connecting port (203); one end of the outdoor heat exchanger (3) is connected to one end of a four-way reversing valve (2), and the interior of the four-way reversing valve (2) is connected to a second connecting port (202); the other end of the outdoor heat exchanger (3) is connected to a first port (401); the outdoor heat exchanger (3) is connected to one end of a drying filter (4), and the other end of the drying filter (4) is connected to the first inlet (501); one end of the liquid storage tank (9) is connected to a through hole (1001), and the other end of the liquid storage tank (9) is connected to a second outlet (602), and the second outlet (602) is connected to the second outlet (602). ), a second inlet (601) is provided on the other side of the indoor heat exchanger (7), the second outlet (602) is connected to the second port (901), the other port of the second inlet (601) is connected to the first outlet (502), one end of the second one-way valve (10) is connected to the third port (902), and the other port of the second one-way valve (10) is connected to the first outlet (502), one end of the indoor heat exchanger (7) is connected to the second port (901), and the other port of the indoor heat exchanger (7) is connected to the fourth connecting port (204), one port of the gas-liquid separator (8) is connected to the first connecting port (201), and the other port of the gas-liquid separator (8) is connected to the compressor (1), an electronic expansion valve (5) is provided on one side of the drying filter (4), and a first one-way valve (6) is provided on the other side of the electronic expansion valve (5).

2. A liquid storage structure for improving system capacity according to claim 1, characterized in that: The liquid storage capacity of the liquid storage tank (9) is sixty percent of the mass of the refrigerant.

3. A liquid storage structure for improving system capacity according to claim 1, characterized in that: The compressor (1) is electrically connected to the liquid storage tank (9) via a wire, and the liquid storage tank (9) is electrically connected to the electronic expansion valve (5) via a wire.

4. A liquid storage structure for improving system capacity according to claim 1, characterized in that: The two ends of the liquid storage tank (9) form a communication structure with the through hole (1001) and the second outlet (602), and the smaller the pressure drop of the liquid storage tank (9), the more obvious the effect of improving the system capacity.

5. A liquid storage structure for improving system capacity according to claim 1, characterized in that: The exhaust port (101), the third connecting port (203), the second connecting port (202), the outdoor heat exchanger (3), the drying filter (4), the electronic expansion valve (5), the first non-return valve (6), the indoor heat exchanger (7), the fourth connecting port (204), the first connecting port (201), the gas-liquid separator (8) and the compressor suction port form a refrigeration condition circulation loop structure.

6. A liquid storage structure for improving system capacity according to claim 1, characterized in that: The exhaust port (101), the third connecting port (203) port, the fourth connecting port (204) port, the indoor heat exchanger (7), the liquid storage tank (9), the second one-way valve (10), the electronic expansion valve (5), the drying filter (4), the outdoor heat exchanger (3), the second connecting port (202) port, the first connecting port (201) port, the gas-liquid separator (8) and the compressor suction port form a heating condition circulation loop structure.

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