CN-117606093-B - Central air conditioner

Abstract

The central air conditioner comprises a compressor, an outdoor heat exchanger, a throttling element and two indoor terminals respectively provided with two indoor heat exchangers, wherein the two indoor terminals can work in an evaporation state or a condensation state, the controller is provided with a reheating and dehumidifying control part configured to enable one indoor heat exchanger to work in the evaporation state and the other indoor heat exchanger to work in the condensation state when a reheating and dehumidifying instruction is received, a self-cleaning control part configured to enable the two indoor heat exchangers to work in the evaporation state and then work in the condensation state when a self-cleaning instruction is received, and an intervention control part configured to execute intervention control and start an auxiliary control element to execute function compensation of the reheating and dehumidifying control part and the self-cleaning control part when one of the reheating and dehumidifying control part and the self-cleaning control part is in the working state and the corresponding target indoor terminal is different from the indoor terminal in the working state at present. The invention can solve the contradiction between reheat dehumidification and self-cleaning functions, and avoid the reduction of user experience when linear waiting is performed in a time-sharing mode.

Inventors

• WANG BING
• LI BIAO

Assignees

• 青岛海信日立空调系统有限公司

Dates

Publication Date

20260508

Application Date

20220525

Claims (5)

1. 1. A central air conditioner comprising: A compressor; An outdoor heat exchanger; the system comprises a throttle element, at least two indoor terminals, a control unit and a control unit, wherein each indoor terminal is internally provided with two indoor heat exchangers which can respectively work in an evaporation state or a condensation state; characterized by further comprising: The regulating expansion valve is arranged on a liquid inlet pipeline of the indoor heat exchanger which is connected with the compressor and works in a condensation state when reheat dehumidification control is executed; a controller having: A reheat dehumidification control unit configured to operate one indoor heat exchanger in one indoor terminal in an evaporation state and the other indoor heat exchanger in a condensation state when receiving a reheat dehumidification instruction; The self-cleaning control unit is configured to enable two indoor heat exchangers in one indoor terminal to work in an evaporation state and then work in a condensation state when a self-cleaning command is received, and the intervention control unit is configured to enable the indoor terminal controlled by the self-cleaning control unit to enter the reheating and dehumidification working state when the self-cleaning control unit is executing the self-cleaning working state and the indoor terminal controlled by the self-cleaning control unit is different from the indoor terminal controlled by the reheating and dehumidification control unit, keep the self-cleaning control unit to stop and wait, and adjust an adjusting expansion valve corresponding to the indoor terminal controlled by the self-cleaning control unit from the maximum opening to the target opening so as to enable the surface of the indoor heat exchanger controlled by the self-cleaning control unit to freeze.
2. 2. The central air conditioner according to claim 1, wherein: The intervention control part is configured to execute the following control according to the coil temperature of the indoor heat exchanger working in a condensation state when reheat dehumidification control is executed in the indoor terminal controlled by the self-cleaning control part: Periodically correcting the target opening; When the coil temperature is above the set judging temperature, executing valve closing control on the regulating expansion valve by taking the actual opening of the previous correction period as a reference; and when the coil temperature is lower than the set judgment temperature, performing valve opening control on the regulating expansion valve by taking the actual opening of the previous correction period as a reference.
3. 3. The central air conditioner according to claim 2, wherein: the intervention control part is provided with a plurality of valve closing temperature thresholds lower than the judging temperature and valve closing adjustment amounts which decrease along with the decrease of the valve closing temperature thresholds; When the coil temperature is above the set judgment temperature, selecting a valve closing adjustment amount according to a valve closing temperature threshold value to execute valve closing control on the adjusting expansion valve; The intervention control part is provided with a plurality of valve opening temperature thresholds which are lower than the judging temperature and valve opening adjustment amounts which are increased along with the decrease of the valve opening temperature thresholds; when the coil temperature is lower than the set judgment temperature, the valve opening adjustment amount is selected according to the valve opening temperature threshold value to execute valve opening control on the adjusting expansion valve.
4. 4. The central air conditioner according to claim 1, wherein: the intervention control part is configured to keep the regulating expansion valve in the indoor terminal controlled by the reheating and dehumidification control part at the maximum opening degree when the reheating and dehumidification control part works, the self-cleaning instruction is received and the target indoor terminal corresponding to the self-cleaning instruction is different from the indoor terminal controlled by the reheating and dehumidification control part.
5. 5. The central air conditioner according to claim 1, wherein: the intervention control unit is configured to restore the regulated expansion valve to the maximum opening degree after the reheat dehumidification control unit stops operating.

Description

Central air conditioner The application is based on domestic application number 202210575536.0, application date 2022-05-25, and the name of the application is the divisional application of a central air conditioner. Technical Field The invention relates to the technical field of air conditioning, in particular to a central air conditioner. Background In rainy days at low temperature, the indoor humidity is higher, the temperature sensing degree is further reduced, and the comfort level of a human body is poor. Indoor humidity can be reduced through air conditioner dehumidification, but because the indoor heat exchanger is in the evaporation state when the air conditioner dehumidifies, indoor temperature can be further reduced, and human discomfort is aggravated. In order to solve the problem, the prior art designs and proposes a dehumidifying air conditioner without cooling, and a main heat exchanger and a sub heat exchanger are arranged in an indoor air conditioner terminal. When dehumidification is carried out at low temperature, the main heat exchanger is in an evaporation state to regulate indoor humidity, the auxiliary heat exchanger is in a condensation state to compensate indoor temperature, and the air outlet temperature is constant and dry. However, there is a certain contradiction between the functions of cooling, dehumidifying and self-cleaning, and the operation cannot be performed at the same time. The prior art overcomes the defects that one of the two is allowed to be executed after the execution of the other is completed, which prolongs the waiting time of the user and influences the user experience. The above information disclosed in this background section is only for enhancement of understanding of the background section of the application and therefore it may not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention In order to solve the problem that the prior art has no contradiction between cooling, dehumidifying and self-cleaning functions and can only linearly wait for time-sharing operation, a central air conditioner is designed and provided. In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme: In some embodiments of the invention, a central air conditioner comprises a compressor, an outdoor heat exchanger, a throttling element, at least two indoor terminals, two indoor heat exchangers and a controller, wherein the two indoor heat exchangers can respectively work in an evaporation state or a condensation state, the controller is provided with a reheat dehumidification control part, a self-cleaning control part and an intervention control part, the reheat dehumidification control part is configured to enable one indoor heat exchanger in one indoor terminal to work in the evaporation state and the other indoor heat exchanger in the condensation state when a reheat dehumidification command is received, the self-cleaning control part is configured to enable the two indoor heat exchangers in the one indoor terminal to work in the evaporation state and then work in the condensation state when a self-cleaning command is received, and the intervention control part is configured to execute intervention control and start one auxiliary control element in the indoor terminal in the current working state to execute function compensation of the former when one of the reheat dehumidification control part and the self-cleaning control part is in the working state and the indoor terminal in the current working state when the other indoor terminal is received and the target indoor terminal corresponding to the control command is different from the indoor terminal in the working state. In some embodiments of the present invention, the auxiliary control element is an auxiliary heating element provided in an indoor terminal, and the intervention control unit is configured to keep the reheat dehumidification control unit waiting and starting the auxiliary heating element in the indoor terminal controlled by the reheat dehumidification control unit when the reheat dehumidification control unit is operated, a self-cleaning instruction is received, and a target indoor terminal corresponding to the self-cleaning instruction is different from the indoor terminal controlled by the reheat dehumidification control unit. In some embodiments of the present invention, the intervention control unit is configured to perform control based on a difference between an air supply temperature of an indoor terminal controlled by the reheat dehumidification control unit and a real-time indoor temperature corresponding to the indoor terminal controlled by the reheat dehumidification control unit, wherein when the reheat dehumidification control unit is operated and a self-cleaning instruction is received and a target indoor terminal corresponding to the self-cleaning instruction is different from the indoor termin