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Multi-connected air conditioning outdoor unit, multi-connected air conditioning system and small load operation control method thereof

A multi-connected air conditioner and outdoor unit technology, which is applied in the direction of air conditioning system, heating and ventilation control system, heating and ventilation safety system, etc. It can solve the problems of affecting user comfort, increasing system oil discharge, affecting system reliability, etc. problems, to achieve the effect of improving the reliability of the system operation, increasing the evaporation temperature, and improving the comfort of use

Inactive Publication Date: 2016-10-05
FOSHAN HECAI TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this practice will cause frequent start and stop of the external unit, which will seriously affect the comfort of users. At the same time, it will increase the oil discharge of the system, make it difficult to return oil, and affect the reliability of the system.

Method used

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  • Multi-connected air conditioning outdoor unit, multi-connected air conditioning system and small load operation control method thereof
  • Multi-connected air conditioning outdoor unit, multi-connected air conditioning system and small load operation control method thereof
  • Multi-connected air conditioning outdoor unit, multi-connected air conditioning system and small load operation control method thereof

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Embodiment Construction

[0044] The present invention will be further described below through specific embodiments.

[0045] A multi-connected air-conditioning system and a control method for its small-load operation, such as figure 1The multi-connected air conditioning system shown includes: a compressor 100 having an exhaust port 101 and an air return port 102; a first check valve 110, the input end 111 of the first check valve 110 is connected to the The exhaust port 101 of the compressor 100 is connected; the first four-way valve 120, the first four-way valve 120 has a first port 121, a second port 122, a third port 123 and a fourth port 124; A four-way valve 130, the second four-way valve 130 has a first port 131, a second port 132, a third port 133 and a fourth port 134, the first port 131 of the second four-way valve 130 and the first port 131 After the first interface 121 of a four-way valve 120 is connected in parallel, it is connected to the output end 112 of the first one-way valve 110; th...

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Abstract

The invention discloses a multi-connected air-conditioning outdoor unit, a multi-connected air-conditioning system and a control method for its small-load operation. The multi-connected air-conditioning outdoor unit includes: a compressor, a first one-way valve, a first four-way valve, The second four-way valve, the first outdoor heat exchanger, the second outdoor heat exchanger, the first electronic throttling component, the second electronic throttling component, the gas side shut-off valve, the liquid side shut-off valve and the second one-way valve. When it is detected that the evaporation temperature of the indoor heat exchanger is low, the system is in low-load cooling operation. By switching part of the outdoor heat exchanger to the evaporator, bypassing part of the refrigerant, unloading part of the capacity output of the compressor, and increasing the low pressure of the system, Increase the evaporation temperature of the indoor heat exchanger, prevent the indoor unit from freezing without stopping the machine, and solve the problem of excessive output of the large-displacement compressor under small load operation, avoid frequent system start-up and stop, and improve user comfort and safety. System operation reliability.

Description

technical field [0001] The invention belongs to the field of electrical appliances, and relates to a multi-connected air conditioner, in particular to a multi-connected air conditioner outdoor unit, a multi-connected air conditioner system and a control method for small-load operation thereof. Background technique [0002] With the development of multi-connection technology, in order to improve the comfort of users, the length of multi-connection piping is getting longer and longer, the number of indoor units is increasing, and the number of outdoor units is required to be larger and larger. The compressor that matches the outdoor unit The displacement is also getting bigger and bigger. For multi-connected systems, variable frequency compressors are generally used, but the variable frequency compressors have a minimum operating frequency. For the volume compressor, the capacity output is still too large, which will cause the low pressure to be low, and the evaporation temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F1/06F24F11/00
Inventor 不公告发明人
Owner FOSHAN HECAI TECH SERVICE
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