Air conditioning system capable of preventing air-cooled heat pump unit from frosting under heating working condition

Abstract

The utility model relates to the technical field of defrosting of air conditioners, in particular to an air-conditioning system capable of avoiding frosting of an air-cooled heat pump unit under the heating working condition, which comprises an outdoor side component and a user side component, and the outdoor side component comprises an evaporator, a primary condenser and a compressor. The evaporator is communicated with the first-stage condenser and the compressor through the control valve assembly, the user side assembly comprises a second-stage condenser and a heat recovery system, and the heat recovery system comprises a split energy recovery exhaust unit and a circulating pump. Compared with a defrosting mode after frosting of a conventional air-cooled heat pump at present, energy consumption generated by defrosting can be directly saved, and the heating operation energy efficiency of the air-cooled heat pump is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of defrosting of air conditioners, in particular to an air conditioning system for preventing frost from forming under heating conditions of an air-cooled heat pump unit. Background Art

[0002] When the air-cooled heat pump is in heating mode, it uses outdoor air as the heat source, lowers the temperature of the refrigerant in the outdoor coil to below the outdoor temperature, exchanges heat with the outdoor air, releases cold air to the outdoor air, absorbs heat from the outdoor air, and then heats the room. Therefore, it has a strong dependence on the environment. When the ambient temperature is low and the humidity is high, when the surface temperature of the outdoor evaporator fins is lower than the dew point temperature of water vapor, condensation will occur on its surface. If the ambient temperature is lower than 0℃, frost will form on the surface of the evaporator, seriously affecting the heat exchange efficiency of the condenser, causing the heating effect to decay and affecting the indoor temperature.

[0003] The current means to solve this problem mainly rely on reverse operation of the system or early heat storage for defrosting, and the need to turn on electric auxiliary heating to assist in electric heating of the indoor air, which consumes a lot of energy and increases operating costs sharply, but the heating effect is still not ideal. Utility Model Content

[0004] The utility model aims to provide an air conditioning system which can avoid frosting of an air-cooled heat pump unit under heating conditions, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The invention discloses an air conditioning system for preventing frosting under heating conditions of an air-cooled heat pump unit. The air conditioning system comprises an outdoor component and a user-side component. The outdoor component comprises an evaporator, a primary condenser and a compressor. The evaporator is respectively connected to the primary condenser and the compressor through a control valve component. The user-side component comprises a secondary condenser and a heat recovery system. The heat recovery system comprises a split energy recovery exhaust fan unit and a circulation pump. The split energy recovery exhaust fan unit is used to recover the energy of indoor exhaust air and transfer it to a circulating medium. The circulation pump is used to drive the circulating medium to flow into the secondary condenser for heat exchange and then flow back to the split energy recovery exhaust fan unit. The secondary condenser is respectively connected to the compressor and the evaporator through the control valve component, and the primary condenser is connected to the secondary condenser.

[0007] Preferably, the control valve assembly includes a first four-way reversing valve and a second four-way reversing valve, and the first four-way reversing valve and the second four-way reversing valve are connected to each other.

[0008] Preferably, the secondary condenser adopts a plate heat exchanger or a shell and tube heat exchanger.

[0009] Preferably, a throttle valve for reducing pressure and cooling is provided between the evaporator and the first four-way reversing valve.

[0010] Preferably, the primary condenser is an air-cooled condenser, and the primary condenser is used for exchanging energy between the outdoor refrigerant and the outdoor air.

[0011] Preferably, the first four-way reversing valve controls the communication between the evaporator and the primary condenser and the compressor, and the second four-way reversing valve controls the communication between the secondary condenser and the compressor and the evaporator.

[0012] Preferably, a primary automatic shut-off valve is provided on the pipeline connecting the secondary condenser with the first four-way reversing valve and the primary condenser, and a secondary automatic shut-off valve is provided on the pipeline connecting the secondary condenser with the first four-way reversing valve.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model utilizes indoor exhaust air energy to avoid frosting in the heating condition of the air-cooled heat pump unit. Compared with the current defrosting method after frosting of conventional air-cooled heat pumps, it can directly save energy consumption caused by defrosting, and greatly improve the heating operation energy efficiency of the air-cooled heat pump; it avoids the attenuation of indoor heating effect caused by defrosting such as compressor reversal and heat storage of conventional air-cooled heat pumps, without any attenuation of heating effect and reduction of quality, and without drainage caused by defrosting; by fully recovering the energy of indoor exhaust air, it can greatly reduce the cold and heat loads of the air-conditioning system, and save the operating energy consumption of the air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a heating working principle diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the refrigeration working principle of the utility model.

[0017] In the figure: 1. evaporator; 2. throttle valve; 3. first four-way reversing valve; 4. second four-way reversing valve; 5. compressor; 6. primary condenser; 7. secondary condenser; 8. circulating pump; 9. split energy recovery exhaust unit; 11. primary automatic shut-off valve; 10. secondary automatic shut-off valve. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1 to Figure 2 , the utility model provides a technical solution:

[0020] An air conditioning system for preventing frost from forming under heating conditions of an air-cooled heat pump unit, the air conditioning system comprising an outdoor component and a user-side component, the outdoor component comprising an evaporator 1, a primary condenser 6 and a compressor 5, the evaporator 1 being connected to the primary condenser 6 and the compressor 5 respectively through a control valve component, the user-side component comprising a secondary condenser 7 and a heat recovery system, the heat recovery system comprising a split energy recovery exhaust fan unit 9 and a circulation pump 8, the split energy recovery exhaust fan unit 9 being used to recover energy from indoor exhaust and transfer it to a circulating medium, the circulation pump 8 being used to drive the circulating medium to flow into the secondary condenser 7 for heat exchange and then flow back to the split energy recovery exhaust fan unit 9, the secondary condenser 7 being connected to the compressor 5 and the evaporator 1 respectively through the control valve component, and the primary condenser 6 being connected to the secondary condenser 7.

[0021] Among them: the secondary condenser 7 adopts a plate heat exchanger or a shell and tube heat exchanger; the primary condenser 6 is an air-cooled condenser, and the primary condenser 6 is used for exchanging energy between the outdoor refrigerant and the outdoor air.

[0022] The control valve assembly includes a first four-way reversing valve 3 and a second four-way reversing valve 4, which are connected to each other. A throttle valve 2 for reducing pressure and cooling is arranged between the evaporator 1 and the first four-way reversing valve 3; the first four-way reversing valve 3 controls the connection between the evaporator 1 and the primary condenser 6 and the compressor 5, and the second four-way reversing valve 4 controls the connection between the secondary condenser 7 and the compressor 5 and the evaporator 1.

[0023] A first-level automatic shut-off valve 11 is provided on the pipeline connecting the secondary condenser 7 with the first four-way reversing valve 3 and the first-level condenser 6, and a second-level automatic shut-off valve 10 is provided on the pipeline connecting the secondary condenser 7 with the first four-way reversing valve 3. Two interlocking automatic shut-off valves are provided. When the heat recovery system is enabled, the first-level automatic shut-off valve 11 automatically opens and the second-level automatic shut-off valve 10 automatically closes; when the heat recovery system is disabled, the first-level automatic shut-off valve 11 automatically closes and the second-level automatic shut-off valve 10 automatically opens. When the heat recovery system is disabled, the valves can be automatically and quickly switched to switch the system to a conventional air-cooled heat pump, which has no effect on the air conditioning effect.

[0024] Working principle:

[0025] Heating workflow: Outdoor side: After the outdoor refrigerant releases heat through the evaporator 1, it flows into the throttle valve 2 for pressure reduction and cooling. After passing through the first four-way reversing valve 3, it flows into the primary condenser 6. After exchanging heat with the outdoor air, it flows into the secondary condenser 7 to exchange heat with the refrigerant medium in the heat recovery system. After passing through the first four-way reversing valve 3, it flows into the second four-way reversing valve 4. After reversing, it flows into the compressor 5. After being pressurized and heated, it flows into the evaporator 1 for the next cycle.

[0026] User side: Circulation pump 8 and split energy recovery exhaust fan unit 9 constitute the heat recovery system on the user side. Split energy recovery exhaust fan unit 9 is responsible for recovering the energy of indoor exhaust air and transferring it to the circulating medium. Circulation pump 8 provides power for the circulating medium of the heat recovery system. Driven by circulation pump 8, the circulating medium flows into secondary condenser 7, exchanges heat with the outdoor refrigerant medium, and then flows back to split energy recovery exhaust fan unit 9 for the next cycle.

[0027] Cooling workflow: Outdoor side: After the refrigerant absorbs heat in the evaporator 1, it passes through the second four-way reversing valve 4 and flows into the compressor 5. After being pressurized and heated, it flows into the first four-way reversing valve 3. After reversing, it flows into the primary condenser 6. After exchanging heat with the outdoor air, it flows into the secondary condenser 7. After exchanging heat with the refrigerant medium in the heat recovery system, it passes through the first four-way reversing valve 3, flows into the throttle valve 2 for pressure reduction and cooling, and flows into the evaporator 1 for the next cycle.

[0028] User side: The circulating pump 8 and the split energy recovery exhaust fan unit 9 constitute the user side heat recovery system. The split energy recovery exhaust fan unit 9 is responsible for recovering the energy of the indoor exhaust air and transferring it to the circulating medium. The circulating pump 8 provides power for the circulating medium of the heat recovery system. Driven by the circulating pump 8, the circulating medium flows into the secondary condenser 7, exchanges heat with the outdoor refrigerant medium, and then flows back to the split energy recovery exhaust fan unit 9 for the next cycle.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air conditioning system for preventing frost from forming in a heating condition of an air-cooled heat pump unit, characterized in that: The air conditioning system comprises an outdoor component and a user-side component. The outdoor component comprises an evaporator (1), a primary condenser (6) and a compressor (5). The evaporator (1) is respectively connected to the primary condenser (6) and the compressor (5) via a control valve component. The user-side component comprises a secondary condenser (7) and a heat recovery system. The heat recovery system comprises a split energy recovery exhaust fan unit (9) and a circulation pump (8). The split energy recovery exhaust fan unit (9) is used to recover the energy of indoor exhaust air and transfer it to a circulating medium. The circulation pump (8) is used to drive the circulating medium to flow into the secondary condenser (7) for heat exchange and then flow back to the split energy recovery exhaust fan unit (9). The secondary condenser (7) is respectively connected to the compressor (5) and the evaporator (1) via a control valve component. The primary condenser (6) is connected to the secondary condenser (7).

2. An air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 1, characterized in that: The control valve assembly comprises a first four-way reversing valve (3) and a second four-way reversing valve (4), and the first four-way reversing valve (3) and the second four-way reversing valve (4) are connected to each other.

3. The air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 1, characterized in that: The secondary condenser (7) is a plate heat exchanger or a shell and tube heat exchanger.

4. The air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 2, characterized in that: A throttle valve (2) for reducing pressure and lowering temperature is provided between the evaporator (1) and the first four-way reversing valve (3).

5. The air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 3, characterized in that: The primary condenser (6) is an air-cooled condenser, and the primary condenser (6) is used for exchanging energy between the outdoor refrigerant and the outdoor air.

6. The air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 4, characterized in that: The first four-way reversing valve (3) controls the communication between the evaporator (1) and the primary condenser (6) and the compressor (5), and the second four-way reversing valve (4) controls the communication between the secondary condenser (7) and the compressor (5) and the evaporator (1).

7. An air conditioning system for preventing frost formation in a heating condition of an air-cooled heat pump unit according to claim 6, characterized in that: A first-stage automatic shutoff valve (11) is provided on the pipeline connecting the secondary condenser (7) with the first four-way reversing valve (3) and the first-stage condenser (6), and a second-stage automatic shutoff valve (10) is provided on the pipeline connecting the secondary condenser (7) with the first four-way reversing valve (3).

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