JPH03247967A - Multi-room separate air conditioner - Google Patents

Abstract

PURPOSE:To eliminate stay of the refrigerant of a room heat exchanger which stops its operation during the cooling and heating operation, improving reliability and reducing the number of components, by a method wherein a multi-room kit has branching parts of refrigerant provided respectively on the liquid pipe side and the gas pipe side of a room unit, a solenoid valve arranged between the branching part on the liquid pipe side and a connecting part of the room unit, and an expansion mechanism and a check valve which are arranged in parallel to the solenoid valve. CONSTITUTION:During operation of cooling, a refrigerant in a refrigeration cycle circulates through a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion mechanism 4, check valve 5, another expansion mechanism 13, a solenoid valve 7a, a room heat exchanger 6a, the four-way valve 2 and the compressor 1 in this order, and cools the room air. At this time, the refrigerant does not flow into a room heat exchanger 6b which does not operate. On the other hand, during the operation of heating, the refrigerant in the refrigeration cycle circulates through the compressor 1, the four-way valve 2, the room heat exchanger 6a, the solenoid valve 7a, a further expansion mechanism 8a, another check valve 9a, and the expansion mechanisms 13 and 4, the outdoor heat exchanger 3, the four-way valve 2 and the compressor 1 in this order, and heats the room air. At this time, the refrigerant flows into the room heat exchanger 6b which does not operate, but passes the expansion mechanism 8b and the check valve 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-chamber peripherally separated air conditioner.

(Prior Art) FIG. 3 is a diagram showing a refrigeration cycle of a conventional multi-chamber peripherally separated air conditioner disclosed in, for example, Japanese Patent Laid-Open No. 62-225867.

In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an expansion mechanism, and 5 is a check valve.

These elements 1 to 5 constitute an outdoor unit. Reference numeral 6 denotes a plurality of indoor heat exchangers connected in parallel to the outdoor unit, and these heat exchangers constitute the indoor unit. Reference numeral 13 denotes a multi-room kit disposed between the indoor unit and the outdoor unit, and one unit is connected to each unit.

In the multi-room kit 13, 11 is a refrigerant branch part provided on the gas pipe side of the indoor heat exchanger 6; 12 is a refrigerant branch part provided on the liquid pipe side of the indoor heat exchanger 6; 10 is a solenoid valve, an expansion mechanism, and a check valve disposed between the connection part on the liquid pipe side of the indoor heat exchanger 6 and the branch part 12, and 10 is the connection part on the gas pipe side of the indoor heat exchanger 6 and the branch part. This is a solenoid valve disposed between the parts 11 and 11.

Next, the operation will be explained.

During cooling operation, the refrigerant in the refrigeration cycle is supplied to the compressor 1,
The four-way valve 2, the outdoor heat exchanger 3, the expansion mechanism 4, the check valve 5, the solenoid valve 7, the expansion mechanism 8, the indoor heat exchanger 6, the solenoid valve 10, the four-way valve 2, and the compressor 1 are circulated in this order, and the indoor cooling the air.

In addition, during heating operation, the refrigerant in the refrigeration cycle is supplied to the compressor 1, four-way valve 2, solenoid valve 10, indoor heat exchanger 6, expansion mechanism 8, check valve 9, solenoid valve 7, expansion mechanism 4, outdoor heat The exchanger 3, four-way valve 2, and compressor 1 are circulated in this order to heat indoor air.

Note that at this time, the solenoid valve 7 of the indoor heat exchanger 6 to be operated.
10 is a solenoid valve 7 of the indoor heat exchanger 6 which is open and does not operate.
10 closes.

(Problems to be Solved by the Invention) As described above, the conventional multi-chamber peripherally separated air conditioner has the solenoid valves 7 on both sides of the liquid pipe side and the gas pipe side of the indoor heat exchanger 6. lO
Because of this, there is a problem in that refrigerant remains in the indoor heat exchanger 6 which is not operating especially during heating, impairing operational reliability. Furthermore, since two solenoid valves are provided as described above, the number of parts increases and the cost becomes high.

This invention was made in order to solve the above-mentioned problems, and the refrigerant does not remain in the indoor heat exchanger when the operation is stopped during heating/cooling operation, thus achieving high reliability and reducing the number of parts. It is an object of the present invention to provide a multi-chamber peripherally separated air conditioner that has a small number of rooms and is therefore inexpensive.

[Means for Solving the Problems] A multi-chamber peripherally separated air conditioner according to the present invention includes an indoor unit having a plurality of indoor heat exchangers, and an outdoor unit having a compressor, an outdoor heat exchanger, and an expansion mechanism. , equipped with a multi-room kit that connects the indoor unit and outdoor unit,
In addition, the aforementioned multi-room kit is arranged between the refrigerant branch parts provided on the liquid pipe side and the gas pipe side of the indoor unit, respectively, and the branch part on the liquid pipe side and the connection part of the indoor unit. It has a solenoid valve, an expansion mechanism and a check valve arranged in parallel with the solenoid valve.

[Function] During cooling operation, refrigerant does not flow into the indoor heat exchanger that is not operating. During heating operation, the refrigerant flows into the indoor heat exchanger that is not operating or passes through the expansion mechanism and check valve, so the refrigerant does not remain in the indoor heat exchanger.

Furthermore, since the solenoid valve is installed only on the liquid pipe side of the indoor unit, the number of parts is reduced compared to conventional air conditioners, and costs can be reduced accordingly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows a refrigeration cycle of a multi-chamber peripherally separated air conditioner according to an embodiment. In the figure, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is an expansion mechanism, 5 is a check valve, and 13 is an expansion mechanism. These elements 1 to 5.13 constitute an outdoor unit. Indoor heat exchangers 6a and 6b are connected in parallel to the outdoor unit, and these heat exchangers constitute the indoor unit. 14 is a multi-room kit placed between the indoor unit and outdoor unit.
Both units are connected respectively.

In the multi-room kit 14, 11 is a refrigerant branch part provided on the gas pipe side of the indoor unit, 12 is a refrigerant branch part 7a provided on the liquid pipe side of the indoor unit.

7b is a solenoid valve disposed between the connection part on the liquid pipe side of the indoor heat exchangers 6a and 6b and the branch part 12, and 8a and 9a are solenoid valves 7a.
8b and 9b are expansion mechanisms and check valves arranged in parallel with the electromagnetic valve 7b.

Next, the operation based on the above configuration will be explained.

In both cooling and heating operations, it is assumed that the solenoid valve 7a of the multi-room kit is opened and the solenoid valve 7b of the multi-room kit is closed.

In this way, during cooling operation, the refrigerant in the refrigeration cycle is transferred to the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion mechanism 4, the check valve 5, the expansion mechanism 13, the solenoid valve 7a, and the indoor heat exchanger. The compressor 6a, the four-way valve 2, and the compressor 1 are circulated in this order to cool the indoor air. At this time, the refrigerant does not flow into the indoor heat exchanger 6b whose operation is stopped.

On the other hand, during heating operation, the refrigerant in the refrigeration cycle is transferred to the compressor 1, the four-way valve 2, the indoor heat exchanger 6a, the solenoid valve 7a, the expansion mechanism 8a, the check valve 9a, the expansion mechanism 13.4, and the outdoor heat exchanger. 3. The four-way valve 2 and the compressor 1 are circulated in this order to heat the indoor air. At this time, refrigerant flows into the indoor heat exchanger 6b whose operation is stopped, but the expansion mechanism 8b and the check valve 9b
pass through.

In addition, since the air conditioner of the embodiment has a structure in which the solenoid valves are provided only on the liquid pipe side of the indoor heat exchangers 6a and 6b, the number of solenoid valves is smaller than before, and the cost is reduced accordingly. It is possible to reduce

FIG. 2 shows a refrigeration cycle of a multi-chamber peripherally separated air conditioner according to another embodiment.

This embodiment is an example in which an expansion mechanism 16 is provided between the refrigerant branch part 12 and the connection part of the outdoor knee knit in the multi-room kit of the above embodiment (Fig. 1), and the other configuration is the same as that of the above embodiment. is the same as

That is, in Fig. 2, 1 is a compressor, 2 is a four-way valve,
3 is an outdoor heat exchanger, 4 is an expansion mechanism, 5 is a check valve, and 13 is an expansion mechanism. These elements 1 to 5.13 constitute an outdoor unit. Indoor heat exchangers 6a and 6b are connected in parallel to the outdoor unit, and these heat exchangers constitute the indoor unit. 15 is a multi-room kit disposed between the indoor unit and the outdoor unit, and both units are connected to each other.

In the multi-room kit 15, 11 is a refrigerant branch provided on the gas pipe side of the indoor unit, 12 is a refrigerant branch provided on the liquid pipe side of the indoor unit, and 7a.

7b is a solenoid valve disposed between the connection part on the liquid pipe side of the indoor heat exchangers 6a and 6b and the branch part 12, and 8a and 9a are solenoid valves 7a.
8b and 9b are expansion mechanisms and check valves arranged in parallel with the electromagnetic valve 7b.

16 is an expansion mechanism disposed between the refrigerant branch section 12 and the connection section of the outdoor unit.

The operation is essentially the same as in the above embodiment.

That is, in both cooling and heating operations, it is assumed that the solenoid valve 7a of the multi-room kit cannot be opened and the solenoid valve 7b of the multi-room kit is closed. During the cooling operation, the refrigerant in the refrigeration cycle is 1. Four-way valve 2. The outdoor heat exchanger 3, the expansion mechanism 4, the check valve 5, the expansion mechanism 13.16, the solenoid valve 7a, the indoor heat exchanger 6a, the four-way valve 2, and the compressor 1 are circulated in this order to cool the indoor air. At this time, the refrigerant does not flow into the indoor heat exchanger 6b whose operation is stopped.

On the other hand, during heating operation, the refrigerant in the refrigeration cycle flows through the compressor 1, four-way valve 2. The indoor heat exchanger 6a, solenoid valve 7a, expansion mechanism 8a, check valve 9a, expansion mechanism 16.13.4, outdoor heat exchanger 3, four-way valve 2, and compressor 1 are circulated in this order to heat the indoor air. do. At this time, the refrigerant flows into the indoor heat exchanger 1jt6b whose operation is stopped, but it passes through the expansion mechanism 8b and the check valve 9b.

Furthermore, in the past, adjustment of the optimal gas amount during cooling and heating had to be done by operating the expansion mechanism 4 of the outdoor unit outdoors, which was time-consuming; however, in this embodiment, the multi-room kit 14 This can be easily done indoors by operating the expansion mechanism 16.

This point is an advantage of this embodiment, and is also a difference from the above embodiments.

C Effects of the Invention As described above, according to the present invention, a solenoid valve is provided only on the liquid pipe side of the indoor unit, and an expansion mechanism and a check valve are provided in parallel with the solenoid valve, so that operation can be stopped during heating and cooling operation. The refrigerant does not remain in the indoor heat exchanger, and the number of parts is reduced. Therefore, a highly reliable and inexpensive multi-chamber peripheral air conditioner can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a multi-chamber peripheral air conditioner according to an embodiment of the present invention, FIG. 2 is a block diagram of a multi-chamber peripheral air conditioner according to another embodiment of the invention, and FIG. FIG. 1 is a configuration diagram of a conventional multi-chamber peripherally separated air conditioner. 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4.8a
, 8b, 13.16 are expansion mechanisms, 5°9a, 9b are check valves, 6a, 6b are indoor heat exchangers, 7a, 7b are solenoid valves,
11.12 is a refrigerant branch, and 14.15 is a multi-room kit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An indoor unit having multiple indoor heat exchangers, a compressor,
an outdoor unit having an outdoor heat exchanger and an expansion mechanism;
a multi-room kit to which an indoor unit and an outdoor unit are connected;
It is characterized by having a solenoid valve disposed between the branch part on the liquid pipe side and the connection part of the indoor unit, and an expansion mechanism and a check valve disposed in parallel with the solenoid valve. Separate air conditioner for multiple rooms.