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 th

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

Examples

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Example Embodiment

[0026] Example one

[0027] Such as image 3 As shown, it is a schematic structural diagram of an embodiment of the variable frequency multi-connected heat pump system provided by the present invention, which specifically includes: 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 the gas-liquid separator 21 is connected to the first port 1 of the four-way reversing valve 28; the suction end 26 of the compressor 24 is connected to the outlet end 22 of the gas-liquid separator 21, and the discharge end of the compressor 24 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 discharge end 25 of the compressor 24, and the other end is connected to the inlet end 23 of the gas-liquid separator 21 for The refrigerant output from the compressor 24 is throttled by adjusting its opening degree.

[0029] P...

Example Embodiment

[0040] Example two

[0041] On the basis of the system described in the first embodiment and the second embodiment above, the present invention provides a method for controlling the system. details as follows:

[0042] When the system is in the refrigeration start phase, if the suction pressure P of the compressor is detected S Less than or equal to the first threshold, the opening degree of the bypass electronic expansion valve is controlled to be 100%; if the suction pressure of the compressor is P S If it is greater than the first threshold, the opening degree of the bypass electronic expansion valve is controlled to be 0%; specifically, the first threshold may be set to 0.11Mpa, but is not limited to this.

[0043] When the system is in the heating start phase, if one of the following conditions is met, the opening degree of the bypass electronic expansion valve is controlled to 100%; if the following conditions are not met, the opening degree of the bypass electronic expansion v...

Example Embodiment

[0050] Example three

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

[0052] Such as Figure 4 As shown, it is a schematic flow diagram of an embodiment of a method for controlling a variable frequency multi-connected heat pump system provided by the present invention, which specifically includes:

[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. The system is in the refrigeration startup stage. Generally, the existing air conditioning system Cooling start time is within 9 minutes or exhaust temperature Td <90°C. In the refrigeration startup stage, when the suction pressure Ps≦0.11MPa, the opening degree of the bypass electronic expansion valve is controlled to 100% (fully open), so that the refrigerant ...

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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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