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Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve

An electronic expansion valve, heat pump system technology, applied in heating and cooling combination, refrigerator, refrigeration components, etc., can solve the problem of heat pump system not running normally, thermal comfort characteristics, system energy efficiency reduction, damage to compressors, etc., to achieve real-time Adjustment control, good thermal comfort characteristics, good effect of safe and stable operation of the system

Active Publication Date: 2015-08-19
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a control method for a frequency conversion multi-connection heat pump system and a bypass electronic expansion valve, which is used to solve the problem that the existing frequency conversion multi-connection air conditioning system cannot effectively adjust the system pressure and output capacity according to the system operating state, so that the energy efficiency of the system can be improved. Reduced, may cause the heat pump system not to operate normally and make the indoor thermal comfort characteristics poor, and even damage the compressor

Method used

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  • Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve
  • Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve
  • Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve

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Embodiment 1

[0027] Such as image 3 As shown, it is a schematic structural diagram of an embodiment of a frequency conversion multi-connected heat pump system provided by the present invention, specifically including: a gas-liquid separator 21 , a compressor 24 , a bypass electronic expansion valve 27 and a four-way reversing valve 28 .

[0028] The inlet end 23 of gas-liquid separator 21 is connected with the first port 1 of four-way reversing valve 28; 25 is connected to the third port 3 of the four-way reversing valve 28; one end of the bypass electronic expansion valve 27 is connected to the exhaust port 25 of the compressor 24, and the other end is connected to the inlet port 23 of the gas-liquid separator 21 for The refrigerant output from the compressor 24 is throttled by adjusting its own opening.

[0029] Preferably, an outdoor heat exchanger 29, an outdoor electronic expansion valve 210, a liquid side stop valve 211 and a gas side stop valve 212 may also be included,

[0030] ...

Embodiment 2

[0041] On the basis of the systems described in Embodiment 1 and Embodiment 2 above, the present invention provides a control method for the system. details as follows:

[0042] When the system is in the cooling start-up phase, if the detection knows the suction pressure P of the compressor S is less than or equal to the first threshold, the opening of the bypass electronic expansion valve is controlled to be 100%; if the suction pressure P of the compressor S If it is greater than the first threshold, the opening of the bypass electronic expansion valve is controlled to be 0%; specifically, the first threshold can be set to 0.11Mpa, but it is not limited thereto.

[0043] When the system is in the heating start-up phase, if any of the following conditions is met, the opening of the bypass electronic expansion valve is controlled to 100%; if none of the following conditions are met, the opening of the bypass electronic expansion valve is controlled is 0%; the conditions incl...

Embodiment 3

[0051] A specific embodiment is given below to describe the control method of the above-mentioned variable frequency multi-connected heat pump system in detail.

[0052] Such as Figure 4 As shown, it is a schematic flow chart of an embodiment of the control method of the frequency conversion multi-connected heat pump system provided by the present invention, specifically including:

[0053] When it is determined that the four-way reversing valve is in the power-off state, the second port of the four-way reversing valve is connected to the third port, and the first port is connected to the fourth port, and the system is in the cooling startup stage. The cooling start time is within 9 minutes or the discharge temperature Td<90°C. In the cooling start-up phase, when the suction pressure Ps≦0.11MPa, the opening of the bypass electronic expansion valve is controlled to 100% (full open), so that the refrigerant discharged from the compressor returns to the gas-liquid separation th...

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Abstract

The invention discloses a frequency conversion multi-connected type heat pump system and a control method of a bypass electronic expansion valve. The system comprises a gas-liquid separator, a compressor and the bypass electronic expansion valve; the inlet end of the gas-liquid separator is connected with a first port of a four-way reversing valve; and the suction end of the compressor is connected with the outlet end of the gas-liquid separator, and the exhaust end of the compressor is connected with a third port of the four-way reversing valve. One end of the bypass electronic expansion valve is connected with the exhaust end of the compressor, the other end of the bypass electronic expansion valve is connected with the inlet end of the gas-liquid separator, and the bypass electronic expansion valve is used for throttling refrigerants output by the compressor by adjusting the opening degree. The bypass electronic expansion valve is arranged between the gas-liquid separator and the compressor, and therefore when the system is started, the proper system pressure can be rapidly built, so that the system can work under the optimum pressure state; the surplus capacity of the system can be effectively unloaded, and it is ensured that the system can safely and stably operate; and on the basis that an existing refrigerant piping scheme of the system is not changed, real-time adjustment and control over the capacity unloading amount of the system can be achieved.

Description

technical field [0001] The invention relates to the technical field of frequency conversion multi-connection heat pump systems, in particular to a control method for a frequency conversion multi-connection heat pump system and a bypass electronic expansion valve. Background technique [0002] The frequency conversion multi-connected heat pump system is composed of an outdoor unit and an indoor unit connected by refrigerant pipelines. The outdoor unit is composed of an outdoor heat exchanger, a compressor and other refrigeration accessories; the indoor unit is composed of a fan and a direct evaporator. An outdoor unit can deliver refrigerant liquid to several indoor units through pipelines, and by controlling the refrigerant circulation volume of the compressor and the refrigerant flow rate entering each heat exchanger in the room, it can timely meet the indoor cooling and heating load requirements. [0003] On the one hand, in the initial stage of the system start-up of the ...

Claims

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Application Information

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IPC IPC(8): F25B29/00F25B49/02F25B41/04F25B41/20
CPCF25B29/003F25B49/02F25B41/31
Inventor 刘敏熊志洪刘洋朱海滨
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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