JPS63231135A - Multi-type air-conditioning machine - Google Patents

Abstract

PURPOSE:To prevent the deterioration of comfortability during room heating operation, by a method wherein the solenoid valve and the expansion valve of an indoor machine, poor in priority, are closed forcibly when an atmospheric temperature reduces during the room heating operation. CONSTITUTION:Switches 13, 14, which sets the preferential order of indoor machines 5, 6 into a control unit 11, are provided in the title machine and priority is set before starting the operation of the machine. An atmospheric temperature is detected by an atmospheric temperature detector 12 and is inputted into the control unit 11. Then, the solenoid valve 4 and the expansion valve 8 of the indoor machine 6, poor in priority, are closed when the atmospheric temperature reduces and becomes a temperature lower than the set temperature, whereby the circulation of refrigerant for the indoor machine 6 is stopped and the refrigerant is circulated only in the indoor machine 5. The number of sets of operating indoor machines is decreased in this manner when the atmospheric temperature reduces and a room heating capacity is deteriorated; therefore, sufficient warm-air is blown off from the operating indoor machine 5, whereby uncomfortable feeling of feeling cold airflow may be eliminated.

Description

[Detailed description of the invention] [Separate field of application] The invention is a multi-type nitrogen conditioner VC, IF?
The present invention also relates to a control system that is suitable for improving performance when the outside air temperature is low during heating operation.

[Conventional technology]

The conventional device has a VC that performs the dredging chamber cutting based on the air conditioning load detected by the indoor unit as described in Jikai 55-56545. However, the air conditioning load detected indoors is the difference between the set temperature and the control temperature, and does not accurately detect a state in which the performance of the air conditioner decreases.

[Problem that the invention seeks to solve]

In a multi-type air conditioner, multiple indoor units are connected, so depending on the installation method, the total capacity of the indoor unit may exceed the capacity of the outdoor unit. If you perform heating operation in such conditions, even if the operating capacity is equivalent to the capacity of the outdoor unit, the difference between the indoor unit's outlet temperature and suction temperature will become small, causing a feeling of cold air and decreasing comfort. The problem was that it was getting worse.

An object of the present invention is to prevent a decrease in comfort during the above-mentioned heating operation.

[Means for solving problems]

It is well known that in air-cooled heat pump type air conditioners, the heating capacity decreases as the outside air temperature decreases, because the amount of heat absorbed from the outside air decreases. Additionally, in general, when the outside temperature is high, the internal temperature is also low, and heating capacity is not required as much.

The above object is achieved by reducing the number or capacity of operable indoor units as the outside air TIL degree decreases due to the characteristics of these air-cooled heat pump air conditioners.

[Effect]

By setting priorities for each indoor unit, the number or capacity of the indoor units that can be operated is limited when the outside air temperature is low and the heating capacity of the air-cooled heat pump type air conditioner is reduced. Further, the indoor units that can be operated can be arbitrarily selected by the user by setting priorities. This allows the user to maintain the maximum number of vehicles in operation for the purpose without sacrificing comfort.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a refrigeration cycle system and a control system for fully explaining the present invention, and the first is a time chart for explaining the present invention. Here, a heating operation of a multi-type air conditioner including a guide device in two rooms will be explained. The refrigeration vehicle has a compressor 1, a four-way valve 2, a solenoid valve A,
The refrigerant is composed of indoor heat exchangers A and B, expansion valves A and B, outdoor heat exchanger 9, and accumulator 10. During heating operation, the refrigerant circulates through the above-mentioned path, repeats state changes, and heats the indoor unit. Blow out the wind. The heating capacity is
It changes depending on the outside air temperature passing through the outdoor heat exchanger, and when the outside air temperature is low, the capacity decreases, and when it is high, the capacity increases, and the temperature of the hot air blown from the indoor heat exchanger also changes when the outside air temperature is high. It is well known that people can get very high.

In the control device 11, there are switches A and B that set the priority operation order of the indoor units A and B, and it is necessary to set the priority operation order before starting the operation. The outside air temperature is detected by the outside air temperature detector 12vr- and is input to the control device 11. When the outside air temperature is high, Vcri, the solenoid valve 6.7 is opened, the expansion valve 8.9 is also controlled to an appropriate throttling amount, and heating operation is performed in both rooms A and B. When the outside air temperature decreases to below the preset temperature T1, the solenoid valve B1 of the guide machine B with the lower priority setting and the shadow valve B close, and the indoor unit B
Refrigerant supply to the facility has been stopped, and refrigerant is circulated only indoors.

In this way, in situations where the outside temperature drops and the heating capacity decreases. Since the number of operating indoor units is reduced, sufficient warm air is blown out from other operating indoor units, eliminating the discomfort of feeling like cold air. In addition, in the above embodiment, consideration has been given so that when the indoor unit A, which has a high priority, is stopped, the guide machine B, which has a low priority, will not be stopped even if the outside air temperature becomes below T1. There is.

〔Effect of the invention〕

According to the present invention, when the outside air temperature becomes low and the heating capacity decreases, the supply of refrigerant to the indoor units with lower priority is stopped by setting the priority operation order set for each indoor unit. Since the actual number of operating indoor units is reduced, it is possible to increase the difference between the blowout temperature and the suction temperature of the operating indoor units, which has the effect of improving comfort.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a refrigeration cycle system, a control unit, and km for explaining one embodiment of the present invention, and Fig. 2 is a time chart explaining the entire invention.1... Compressor 3
．． 4...''#7L magnetic valve 5, 6... Indoor heat exchanger 7, 8... W tension valve 11... Control device ylt
12...Outside temperature detector 13.14...Switch.

Claims (1)

[Claims] In an air-cooled heat pump air conditioner that consists of one outdoor unit and multiple indoor units, there is a function to set priorities corresponding to the indoor units, a function to detect the outside air temperature, and a refrigerant flow path corresponding to each indoor unit. Equipped with a solenoid valve installed in the indoor unit and an electrically driven expansion valve, during heating operation, when the outside temperature drops, the solenoid valve and expansion valve corresponding to the indoor unit with lower priority are forcibly closed. A multi-type air conditioner characterized by: