Air source heat pump system with energy storage and defrosting functions

Abstract

The utility model discloses an air source heat pump system with energy storage and defrosting functions, which comprises a compressor, a four-way valve, a condenser, a throttling device, an evaporator, a gas-liquid separator, a liquid storage device and an energy storage device, and the compressor, the four-way valve, the condenser, the liquid storage device, the throttling device and the evaporator are connected in sequence; one end of the energy storage device is connected between the outlet c of the compressor and the condenser; and the other end of the energy storage device is connected between the condenser and the liquid storage device through a pipeline. According to the air source heat pump, on the premise that unit heating is met, the phase change working medium in the energy storage device of the refrigerating system is used for storing heat, when the system meets the defrosting condition, the energy storage device is preferentially used for providing heat needed by defrosting, heat does not need to be taken from the outside, and therefore the influence of defrosting on the tail end temperature is eradicated.

Description

Technical Field

[0001] The utility model relates to the field of new energy, in particular to an air source heat pump system with energy storage and defrosting functions. Background Art

[0002] A major problem of air source heat pump units in winter heating operation is the frosting of the fin heat exchanger. When the fin heat exchanger is frosted, the air flow resistance of the fin heat exchanger will increase, the air volume will decrease, and the heat exchange capacity of the unit will be weakened. There are many defrosting control methods for air source heat pump units in the prior art, including reverse cycle defrosting method, hot gas bypass defrosting method, sensible heat defrosting method, etc. However, these methods essentially use the compressor to do work, and the heat required for defrosting basically comes from the user end, and the heat for defrosting is insufficient. Therefore, it is difficult to achieve on-demand defrosting in actual operation, and the defrosting effect is not ideal. Long-term defrosting will affect the user's comfort experience, and even cause the suction pressure to be too low during the defrosting process, resulting in low-pressure protection shutdown and other problems.

[0003] Therefore, the prior art urgently needs an air source heat pump system that can provide sufficient defrosting heat to prevent the impact of defrosting on the terminal temperature. Utility Model Content

[0004] In order to solve various problems existing in traditional solutions, the utility model provides an air source heat pump system with energy storage defrosting function, the system includes a compressor, a four-way valve, a condenser, a throttling device, an evaporator, a gas-liquid separator, a liquid storage device, and the system also includes an energy storage device;

[0005] The outlet of the compressor is connected to the port b of the four-way valve through a pipeline, the outlet c of the four-way valve is connected to one end of the condenser through a pipeline, the other end of the condenser is connected to one end of the liquid reservoir through a pipeline, the other end of the liquid reservoir is connected to one end of the throttling device through a pipeline, the other end of the throttling device is connected to one end of the evaporator, and the other end of the evaporator is connected to the port a of the four-way valve through a pipeline; the port d of the four-way valve is connected to one end of the gas-liquid separator through a pipeline, and the other end of the gas-liquid separator is connected to the inlet of the compressor through a pipeline;

[0006] One end of the energy storage device is connected to the middle of the C outlet of the compressor and the condenser through a pipeline; the other end of the energy storage device is connected to the middle of the condenser and the liquid storage through a pipeline.

[0007] Furthermore, a first solenoid valve is provided between the C port of the compressor and the condenser.

[0008] Furthermore, a second solenoid valve and a third solenoid valve are respectively provided on both sides of the energy storage device.

[0009] Furthermore, the energy storage device is a coil heat exchanger.

[0010] Furthermore, the system is also provided with a drying filter.

[0011] Furthermore, a fan is arranged next to the evaporator.

[0012] Furthermore, the throttling device is an electronic expansion valve.

[0013] Furthermore, a phase change material is provided in the energy storage device.

[0014] The air source heat pump with energy storage defrosting function provided by the utility model uses the phase change working medium in the energy storage device of the refrigeration system to store heat under the premise of meeting the heating requirements of the unit. When the system reaches the defrosting conditions, the energy storage device is used first to provide the heat required for defrosting, without the need to take heat from the outside, thereby eliminating the impact of defrosting on the terminal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific implementation of the present invention, the following briefly introduces the drawings required for use in the specific implementation or the description of the prior art.

[0016] Figure 1 This is a schematic diagram of the system structure of Example 1 disclosed in the utility model.

[0017] The meanings of the accompanying drawings are: 1 evaporator, 2 throttling device, 3 drying filter, 4 liquid storage device, 5 condenser, 6 first solenoid valve, 7 gas-liquid separator, 8 compressor, 9 four-way valve, 10 fan, 11 energy storage device, 12 second solenoid valve, 13 third solenoid valve. DETAILED DESCRIPTION

[0018] The structure and operation of the utility model patent will be further described in detail below in conjunction with the accompanying drawings. Obviously, the accompanying drawings are provided only for a better understanding of the utility model patent, and they should not be understood as limitations on the utility model patent. Based on the embodiments of the utility model patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first" and "second" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example 1

[0022] Combination Figure 1 As shown, this embodiment discloses an air source heat pump system with energy storage and defrosting function, wherein the system includes a compressor 8, a four-way valve 9, a condenser 5, a throttling device 2, an evaporator 1, a gas-liquid separator 7, a liquid storage device 4, and an energy storage device 11.

[0023] The outlet of the compressor 8 is connected to the b port of the four-way valve 9 through a pipeline, the c outlet of the four-way valve 9 is connected to one end of the condenser 5 through a pipeline, the other end of the condenser 5 is connected to one end of the liquid reservoir 4 through a pipeline, the other end of the liquid reservoir 4 is connected to one end of the throttling device 2 through a pipeline, the other end of the throttling device 2 is connected to one end of the evaporator 1, and the other end of the evaporator 1 is connected to the a port of the four-way valve 9 through a pipeline; the d port of the four-way valve 9 is connected to one end of the gas-liquid separator 7 through a pipeline, and the other end of the gas-liquid separator 7 is connected to the inlet of the compressor 8 through a pipeline.

[0024] One end of the energy storage device 11 is connected to the middle of the outlet c of the compressor 8 and the condenser 5 through a pipeline; the other end of the energy storage device 11 is connected to the middle of the condenser 5 and the liquid storage tank 4 through a pipeline.

[0025] Specifically, a first solenoid valve F1 is provided between the port c of the compressor 8 and the condenser 5 .

[0026] Specifically, a second solenoid valve F2 and a third solenoid valve F3 are respectively disposed on both sides of the energy storage device 11 .

[0027] Specifically, the energy storage device 11 is a coil heat exchanger.

[0028] Specifically, the system is further provided with a drying filter 3 .

[0029] Specifically, a fan 10 is arranged beside the evaporator 1 .

[0030] Specifically, the throttling device 2 is an electronic expansion valve.

[0031] Specifically, the energy storage device 11 is provided with a phase change material.

[0032] The system works as follows:

[0033] When the system is Figure 1 In the heating operation condition shown by the solid arrow, the high-temperature and high-pressure gaseous working medium discharged from the compressor 8 first enters the heat exchange coil of the heat storage device 11 through the solenoid valve F2, and exchanges heat with the heat storage medium outside the heat exchange coil through the heat conduction of the heat exchange coil. The heat storage medium absorbs the heat released during the condensation process of the refrigerant working medium and begins to store heat. After the heat storage is completed, the corresponding valves are closed (F2 and F3 are closed), and F1 is opened, and the system returns to the original heat pump mode for heating. During defrosting, F1 is closed, F2 and F3 are opened, and the four-way valve 9 is reversed. The high-temperature working medium discharged from the compressor 8 is discharged according to the heat pump mode. Figure 1 In the direction indicated by the dotted arrow, it first enters the evaporator 1, heats the fin tube, melts the frost layer on its surface, and achieves the purpose of defrosting. During the defrosting process, the condensed refrigerant passes through the throttling device 2 and becomes a two-phase flow mainly composed of low-temperature and low-pressure liquid working fluid. The two-phase flow working fluid then enters the energy storage device (used as an evaporator) after heat storage. At this time, the heat storage medium after heat storage releases heat to the refrigerant through the coil, accelerating the evaporation of the liquid refrigerant. In this way, the heat stored in the energy storage device 11 is used as the main heat source of the low-level heat source, providing sufficient defrosting heat for defrosting, and completely solving the problem of insufficient heat supply from the low-level heat source during conventional defrosting. The heat storage medium in the specific energy storage device is a phase change material, so that more heat can be stored in a relatively small volume.

[0034] This embodiment can achieve the following technical effects:

[0035] (1) The system is used for mine antifreeze. The system does not need to take heat from the wellhead for defrosting, and will not cause fluctuations in the air supply temperature at the wellhead.

[0036] (2) Since the energy storage device can provide a higher temperature, the unit has high defrosting efficiency, short defrosting time, and improved overall operating efficiency;

[0037] (3) The system can rely on the heat generated by the energy storage device to defrost on a regular basis without stopping the machine. When the evaporator is frost-free, the unit can operate more efficiently.

[0038] The above embodiments are only used to illustrate the present utility model patent, wherein the structure, connection method and manufacturing process of each component can be changed. Any equivalent transformations and improvements based on the present technical solution should not be excluded from the protection scope of the present utility model patent.

Claims

1. An air source heat pump system with energy storage and defrosting function, the system comprising a compressor, a four-way valve, a condenser, a throttling device, an evaporator, a gas-liquid separator, and a liquid storage device, characterized in that: Also includes an energy storage device; The outlet of the compressor is connected to the port b of the four-way valve through a pipeline, the outlet c of the four-way valve is connected to one end of the condenser through a pipeline, the other end of the condenser is connected to one end of the liquid reservoir through a pipeline, the other end of the liquid reservoir is connected to one end of the throttling device through a pipeline, the other end of the throttling device is connected to one end of the evaporator, and the other end of the evaporator is connected to the port a of the four-way valve through a pipeline; the port d of the four-way valve is connected to one end of the gas-liquid separator through a pipeline, and the other end of the gas-liquid separator is connected to the inlet of the compressor through a pipeline; One end of the energy storage device is connected to the middle of the C outlet of the compressor and the condenser through a pipeline; the other end of the energy storage device is connected to the middle of the condenser and the liquid storage through a pipeline.

2. The system according to claim 1, characterized in that: A first solenoid valve is arranged between the C port of the compressor and the condenser.

3. The system according to claim 1, characterized in that: A second solenoid valve and a third solenoid valve are respectively arranged on both sides of the energy storage device.

4. The system according to claim 1, characterized in that: The energy storage device is a coil heat exchanger.

5. The system according to claim 1, characterized in that: The system is also provided with a filter drier.

6. The system according to claim 1, characterized in that: A fan is arranged beside the evaporator.

7. The system according to claim 1, characterized in that: The throttling device is an electronic expansion valve.

8. The system according to claim 1, characterized in that: Phase change material is arranged in the energy storage device.

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