JPH03175228A - Air conditioner - Google Patents

Abstract

PURPOSE:To prevent a room temperature from falling at a dash, prevent a sense of cold wind and improve an amenity in a room by providing an outdoor unit with the same number of four-way changeover valves as that of indoor units and sequentially changing over the four-way changeover valves so that defrosting operation is not conducted at the same time in defrosting in heating operation. CONSTITUTION:An outdoor unit 1 is composed of a compressor 2, outdoor heat exchangers 5 divided to the same number as that of indoor units 6, the same number of four-way changeover valves 4 as that of the indoor units 6 and branch tubes 3 which are branched to the same number as that of the indoor units 6 and can join together again. The branch tubes 3 are mounted to the inlet and outlet of the compressor 1 and independent refrigerating cycle circuits are formed while including the four- way changeover valves 4 and the outdoor heat exchangers 5. Thus, since a defrosting operation can be independently performed by each indoor unit 6 in a heating operation, it is possible that only one indoor unit performs a defrosting operation and the other indoor units perform heating operations. Further, a plurality of the indoor units 6 sequentially perform the defrosting operation and, when one indoor unit 6 performs the defrosting operation, the other indoor units perform the heating operations without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air-cooled heat pump type multi-type air conditioner.

[Conventional technology]

In conventional multi-type air conditioners, the refrigeration cycle configured for the outdoor unit compressor consists of a compressor, a four-way switching valve, an outdoor heat exchanger, and multiple indoor heat exchangers. (Hitachi Service Manual PAH-8809
).

[Problem to be solved by the invention]

The above conventional technology does not take into consideration the defrosting required for air-cooled heat pump refrigeration cycles, and there is a problem that multiple indoor units start defrosting operation at the same time, causing the temperature in the room where they are installed to drop all at once. there were.

The purpose of the present invention is to sequentially install indoor units of a multi-type air conditioner.
By switching to defrosting, the temperature in the room where it is installed can be prevented from dropping suddenly, preventing the feeling of cold air and improving indoor comfort.

[Means to solve the problem]

In order to achieve the above object, one aspect of the present invention is to divide the refrigerant cycle piping into the number of indoor units at the compressor discharge pipe of the outdoor unit. The outdoor unit heat exchanger will also be divided into the same number of indoor units. In addition, there are the same number of indoor and outdoor unit connecting pipes as there are indoor units, and these pipes are connected to each other so that they join together at the compressor suction pipe. In other words, the air conditioner shares a compressor and has independent refrigeration cycles for the number of indoor units, and each refrigeration cycle is equipped with a four-way switching valve, making it possible to perform defrosting operations with a single refrigeration cycle.

When defrosting these independent refrigeration cycles, multiple refrigeration cycles are not defrosted at the same time, each refrigeration cycle is defrosted in sequence, and the room where the indoor unit is installed is heated all at once. This prevents the decline in

[Effect]

Each refrigeration cycle is independent, and each refrigeration cycle is provided with a one-way switching valve, so each refrigeration cycle can be operated independently for defrosting. When one refrigeration cycle is in defrosting operation, the other refrigeration cycle is always in heating operation, so the temperature in the room on the indoor machine side does not drop all at once.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The outdoor unit 1 is a compressor 2. Outdoor heat exchanger 5 divided into the same number as the number of indoor units 6. The same number of four-way switching valves as the number of indoor units 6 4. It is composed of branch pipes 3 that can branch and merge in the same number as the number of indoor units 6, and the branch pipes 3 are attached to the entrance and exit of the compressor 1, respectively, and the four-way switching valve 4. An independent refrigeration cycle circuit is formed in each outdoor heat exchanger. In addition, the indoor unit 6 is connected to an indoor heat exchanger 7.
．． It is composed of an expansion mechanism 8. This outdoor unit 1 and a plurality of indoor units 6 are connected through connecting pipes to complete a refrigeration cycle.

Figure 2 shows a conventional refrigeration cycle. The structure of the equipment includes
This is basically the same as in FIG. 1, but the branch to the indoor unit 6' is made in the middle of the continuous piping, and there is only one four-way switching valve 4' in the outdoor unit 1. For this reason, in order to perform defrosting operation during heating operation, when the four-way switching valve 4' is switched, all of the indoor units 6' go into defrosting operation, blowing cold air to the indoor side, and the temperature of the room on the indoor side decreases. It will drop all at once, impairing comfort.

In FIG. 1 of the present invention, although the compressor 1 is shared, it has an independent refrigeration cycle, and each has an independent four-way switching valve 4.
It is now possible to switch between. As a result, when defrosting operation is performed during heating operation, it can be performed for each indoor unit 6, so that only - unit can perform defrosting operation and other indoor units can perform heating operation.

Further, the plurality of indoor units 6 sequentially perform defrosting operation.

-When the unit is in defrosting mode, the remaining indoor units are always in heating mode. Therefore, even though one indoor unit blows out cold air, the other indoor units blow out warm air, so the temperature inside the room does not drop all at once, and comfort is not significantly impaired. do not have.

According to this embodiment, by sequentially performing defrosting operation for each indoor unit in a multi-type air conditioner, the room temperature inside the room does not drop all at once, and comfort during heating operation can be improved. .

〔Effect of the invention〕

According to the present invention, without significantly changing the configuration of one device,
The feeling of cold air from defrosting during heating operation can be alleviated, and comfort can be improved.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a refrigeration cycle according to an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional refrigeration cycle. 1.1'...Outdoor unit, 2,2'...Compressor, 3.3
'...Branch pipe, 4,4'...Four-way switching valve, 5.5'
Mountain outdoor heat exchanger, 6,6'...Indoor unit, 7.7'...
・Indoor heat exchanger, 8, 8'...expansion mechanism.

Claims (1)

[Claims] 1. An air conditioner comprising a plurality of indoor units each including a heat exchanger and a blower, and one outdoor unit including the heat exchanger, the blower, and a compressor, wherein the outdoor unit is connected to the indoor unit. An air conditioner characterized in that the same number of four-way switching valves as the number of indoor units are provided, and when defrosting during heating operation, the four-way switching valves are sequentially switched so that each of the indoor units does not defrost at the same time. .