Heating control system and multi-connected air-conditioning system technology realization elements containing it

Technical realization elements:

4. The purpose of this utility model is to provide a heating control system and a multi-connected air-conditioning system containing it, to solve the technical problem of multi-connected low-temperature heating operation in the prior art, and the heat attenuation caused by the accumulation of gas .

5. In order to achieve the above purpose, the present utility model provides the following technical solutions:

6. A heating control system provided by the present utility model includes a heat exchange assembly. The two ends of the high temperature flow path of the heat exchange assembly are respectively connected to the exhaust side and the heating demand side of the compressor, and the heat exchange assembly The two ends of the low-temperature flow path are respectively connected with the gas-liquid separator and the suction side of the compressor.

7. As a further improvement of the present invention, the low-temperature flow path connected to the suction side of the compressor includes a first branch circuit and a second branch circuit arranged in parallel, and the first branch circuit is connected to the suction side of the compressor. On the gas port, the second branch circuit is connected to the enthalpy-increasing gas port of the compressor.

8. As a further improvement of the present utility model, the first branch circuit and the second branch circuit are respectively provided with a first supplemental air solenoid valve and a second supplemental air solenoid valve.

9. As a further improvement of the present invention, a capillary tube and a bypass solenoid valve are provided on the high-temperature flow path close to the discharge side of the compressor.

10. As a further improvement of the present utility model, a liquid discharge electronic expansion valve is provided on the low-temperature flow path near the side of the gas-liquid separator.

11. As a further improvement of the present utility model, it also includes temperature sensors arranged at the inlet pipe of the gas-liquid separator, on the suction side of the compressor and in the environment, and pressure sensors arranged at the inlet pipe of the gas-liquid separator.

12. As a further improvement of the present utility model, the switching states of the first supplemental solenoid valve and the second supplementary solenoid valve are opposite.

13. As a further improvement of the present utility model, the heating control system has two operating states, namely the liquid accumulation state and the liquid accumulation state, when the compressor suction temperature and the gas-liquid separator inlet When the tube temperature is less than the set value, and the difference between the ambient temperature and the evaporation temperature of the gas-liquid separator inlet is greater than the set value, the heating control system is in liquid accumulation

In the air return state, the first air supplement solenoid valve is opened; when the suction temperature of the compressor and the inlet pipe temperature of the gas-liquid separator are less than the set value, and the difference between the ambient temperature and the evaporation temperature at the inlet of the gas-liquid separator is less than When the setting value is set, the heating control system is in a liquid accumulation and air supplement state, and the second air supplement solenoid valve is opened.

14. As a further improvement of the present invention, the heat exchange component is an economizer or a heat exchanger.

15. The utility model provides a multi-line air-conditioning system, which includes a compressor connected by a refrigerant flow path, a plurality of indoor units, outdoor units, and gas-liquid separators arranged in parallel, and a gas-liquid separator installed in the gas-liquid separator. And the heating control system between the compressor and the compressor.

16. The heating control method for indoor heating by the multi-line air conditioning system provided by the present invention includes the following steps:

17. Step 100, heating start: turn on the heating mode of the multi-line air conditioning system to heat the room;

18. Step 200. Normal heating: When the suction temperature of the compressor and the inlet pipe temperature of the gas-liquid separator are greater than the set value, the control system judges that the multi-connected air conditioning system is in normal heating mode, and the discharge electronic expansion valve is closed ; The refrigerant is discharged from the discharge side of the compressor and then led to the indoor side through an oil separator and a four-way valve. The high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature liquid refrigerant through the indoor unit, and then throttled by the heating electronic expansion valve to become gas The refrigerant in the liquid mixed state enters the outdoor unit to further evaporate and exchange heat into a low-pressure gas refrigerant, and finally return to the low-pressure side through the four-way valve, enter the gas-liquid separator, and return to the suction side of the compressor;

19. Step 300. Liquid return state: When the suction temperature of the compressor and the inlet pipe temperature of the gas-liquid separator are less than the set value, the control system judges that there is liquid accumulation in the gas-liquid separator in the multi-connected air conditioning system. The control system controls the discharge electronic expansion valve to open; when the difference between the ambient temperature and the evaporation temperature at the inlet of the gas-liquid separator is greater than the set value, the control system judges that the multi-connected air conditioning system is in the heating operation attenuation state, and the control system controls the first The air supplement solenoid valve is opened; the refrigerant is discharged from the compressor discharge side and then led to the indoor side through an oil separator and a four-way valve. The high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature liquid refrigerant through the indoor unit, and then passes through the heating electronic expansion valve section. After flowing into the gas-liquid mixed refrigerant, it enters the outdoor unit to further evaporate and exchange heat into a low-pressure gas refrigerant, and finally returns to the low-pressure side through the four-way valve, and enters the gas-liquid separator. The flow path enters the heat exchange component and the high temperature and high pressure refrigerant introduced in the high temperature flow path is heated and evaporated, and the heated and evaporated refrigerant returns to the suction port of the compressor through the first branch circuit;

20. Step 400, liquid accumulation state: when the suction temperature of the compressor and the inlet pipe temperature of the gas-liquid separator are less than the set value, the control system determines that there is liquid accumulation in the gas-liquid separator in the multi-connected air conditioning system, The control system controls the discharge electronic expansion valve to open; when the difference between the ambient temperature and the evaporation temperature at the inlet of the gas-liquid separator is less than the set value, the control system judges that the multi-connected air-conditioning system is in the normal heating operation state, and the control system controls the second The air supplement solenoid valve is opened; the refrigerant is discharged from the compressor discharge side and then led to the indoor side through an oil separator and a four-way valve. The high-temperature and high-pressure gaseous refrigerant is condensed into a high-temperature liquid refrigerant through the indoor unit, and then passes through the heating electronic expansion valve section. After flowing into the gas-liquid mixed refrigerant, it enters the outdoor unit to further evaporate and exchange heat into a low-pressure gas refrigerant, and finally returns to the low-pressure side through the four-way valve, and enters the gas-liquid separator. The flow path enters the heat exchange assembly and heats and evaporates the high temperature and high pressure refrigerant introduced in the high temperature flow path. The heated and evaporated refrigerant returns to the air supply port of the compressor through the second branch circuit.

21. Compared with the prior art, this utility model has the following beneficial effects:

22. The multi-line air-conditioning system provided by the present utility model is provided with a heat exchange assembly between the gas-liquid separator and the compressor, so that the refrigerant accumulated in the gas-liquid separator can be discharged from the heat exchange assembly and the high temperature caused by the exhaust gas. The high-pressure refrigerant performs heat exchange to realize the heating and evaporation of the liquid refrigerant, avoiding the attenuation of heating heat caused by the accumulation of liquid in the gas-liquid separator, increasing the circulation of refrigerant during low-temperature heating, reducing the number of defrosting times of the unit, and improving the comfort of heating; The refrigerant stored in the gas-liquid separator is added

After the heat evaporates, you can choose to enter the compressor suction port to increase the air intake, or you can choose to enter the compressor to increase the enthalpy of the intermediate air supplement to increase the intermediate air supplement and increase the heating capacity; the multi-line air-conditioning system provided by the utility model can be set The heat control system forms a dual low-pressure air supplement control system. When heating is running, the outdoor unit heat exchanger is the first low-pressure side, and the gas-liquid separator drains to the heat exchange assembly to form the second low-pressure side. The dual low-pressure separate and independent control can be used Improve the heat exchange capacity, increase the overall low-pressure side evaporation pressure, slow down the attenuation of low pressure, and then slow down the frosting speed, prolong the continuous heating time, reduce the frequency of defrosting, and have higher heating comfort.

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