JPH02118372A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To permit the simultaneous and selective cooling and heating operations of a plurality of indoor machines by a method wherein a relaying machine, accommodating a first branching part, a second flow rate control device and a second branching part, is interposed between a heat source machine and a plurality of indoor machines. CONSTITUTION:When the majority of indoor machines is operated for heating upon simultaneous cooling and heating operation, high-temperature high-pressure gas, discharged out of a compressor 1, is sent into a relaying machine E through a first connecting pipeline 6, passes through a first branching part 10, a three-way switching valve 8 and indoor machine side first connecting pipelines 6b, 6c sequentially and flows into respective indoor machines B, C, which are scheduled to effect room heating, to heat rooms by indoor side hat exchangers 5. Then, the condensed and liquefied refrigerant passes through a first flow rate control device 9 almost fully opened and the pressure thereof is reduced slightly, then, flows into a second branching part 11. Then, a part of the refrigerant enters into an indoor machine D, scheduled to effect cooling, through indoor machine side first connecting pipeline 7d and cools the room by entering into the indoor side heat exchanger 5 after passing through the first flow rate control device 9 and reducing the pressure thereof, then, flows into a second connecting pipeline 7 through the three-way change-over valve 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-room heat pump type air conditioner in which a plurality of indoor units are connected to one heat source unit. The present invention relates to an air conditioner that can selectively perform heating and cooling for each indoor unit, or simultaneously perform cooling with one indoor unit and heating with the other indoor unit.

[Conventional technology]

Conventionally, heat pump air conditioners have been common in which multiple indoor units are connected to one heat source unit using two pipes, a gas pipe and a liquid pipe, and each indoor unit performs heating and cooling operation. , or all configured to provide cooling.

[Problem to be solved by the invention]

Conventional multi-room heat pump air conditioners are configured as described above, so all indoor units operate only for heating or cooling, so heating is performed in places where cooling is required, or vice versa. There were issues with air conditioning in places.

In particular, when installed in a large building, the air conditioning load is significantly different between the interior section and a portion of the verimeter, or between a general office and a computer room or other open-aired room, which poses a particular problem.

This invention was made to solve the above-mentioned problems. Multiple indoor units are connected to one heat source unit, and each indoor unit can selectively perform air conditioning or heating. The indoor unit can perform cooling and the other indoor unit can perform heating at the same time, and when installed in a large building, the interior part and part of the Verimeter, or the general office and computer room, etc. can be made OA. Even if the air conditioning loads differ significantly in different rooms, the multi-room heater (
The purpose is to obtain a pump type air conditioner.

[Means to solve the problem]

The air conditioner according to the present invention is one in which one heat source device and a plurality of indoor units are connected via first and second connection pipes, in which one of the plurality of indoor units is connected to the above-mentioned indoor unit. 1
or a first branch part that is switchably connected to the connecting pipe or the second connecting pipe, and the other of the plurality of indoor units through a first flow rate control device connected to the indoor unit. The first branch is connected to a second branch connected to a second connection pipe, and the first branch and the second branch are connected via a second flow rate control device. A relay machine having a built-in branch part, a second flow rate control device, and a second branch part is interposed between the heat source machine and the plurality of indoor units, and the heat source machine and the repeater are connected to each other. The first and second connecting pipes are extended and connected between the two.

[Effect]

In this invention, when heating is the main component in simultaneous cooling and heating operation, high-pressure gas refrigerant is introduced from the first connecting pipe and the first branch into each indoor unit to be heated, and then the refrigerant is A part of the air flows from the second branch into the indoor unit to be cooled, and then flows from the first branch into the second connection pipe.

On the other hand, the remaining refrigerant flows into the second connection pipe through the second flow rate control device, joins with the refrigerant that has passed through the cooling indoor unit, and returns to the heat source device.

In addition, if the main purpose is cooling, the high-pressure gas is exchanged with an arbitrary amount of heat using a heat source device, and a part of the refrigerant is introduced into a two-phase state from the second connecting pipe through the first branch to the indoor unit for heating. It performs heating and flows into the second branch. On the other hand, the remaining refrigerant passes through the second flow rate control device, joins with the refrigerant that has passed through the indoor unit that is attempting to heat the air at the second branch, and flows into each indoor unit that is attempting to cool the air. Thereafter, the heat is guided from the first branch through the first connection pipe to the heat source machine and returns to the compressor.

Furthermore, in the case of only heating operation, the refrigerant is introduced from the heat source device through the first connection pipe and the first branch to each indoor unit, heated, and then transferred from the first branch to the second connection pipe and the heat source device. Return to

In the case of only cooling operation, the refrigerant is introduced from the heat source device through the second connecting pipe and the second branch part to each indoor unit, cooled, and then passed from the first branch part to the first connecting pipe to the heat source. Return to the machine.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to a first embodiment of the present invention. Also, Figures 2 to 4
The figure shows the operating state during cooling/heating operation in the embodiment shown in Fig. 1, Fig. 2 shows the operating state of cooling or heating only, and Figs. 3 and 4 show the operation of simultaneous cooling/heating operation. Figure 3 is an operating state diagram showing heating-dominant operation (when the heating operating capacity is greater than cooling operating capacity), and Figure 4 is an operating state diagram showing cooling-dominant operation (when cooling operating capacity is greater than heating operating capacity). . FIG. 5 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to another embodiment of the present invention.

In this embodiment, a case will be described in which three indoor units are connected to one heat source device, but the same applies to a case in which two or more indoor units are connected.

5) is a heat source unit, and 0), C), and 0) are indoor units that are connected in parallel to each other as described later, and each has the same configuration. @) is a repeater that incorporates a first branch, a second flow control device, and a second branch, as will be described later.

(1) is a compressor, (2) is a four-way valve that switches the refrigerant flow direction of the heat source machine, (3) is a heat exchanger on the heat source machine side, (4) is an accumulator, and the above equipment (1) to (3) is connected to constitute a heat source device (4). (5) is the three indoor heat exchangers, (6) is the first connection pipe that connects the four-way valve (2) of the heat exchanger <A) and the relay machine (port), (6b), (6c ), (6d
) are connected to the indoor heat exchanger (5) and repeater (indoor heat exchanger (5) of indoor m (B), (Q, and (b)), respectively, and the first connecting pipe (
The first connection pipe on the indoor unit side corresponding to (6), the second connection pipe (7) connecting the heat source machine side heat exchanger (3) of the heat source machine (4) and the relay machine (G), ( 7b), (7c), (7d
) connects the indoor heat exchanger (5) and repeater (6) of the indoor units (B), (C), 0)) respectively, and connects the second connection pipe (
7) corresponds to the second connection pipe on the indoor unit side, and (8) corresponds to the first connection pipe on the indoor unit side (6b), (6c), (6d).
and the first connection pipe (6) or the second connection pipe (7)
) side, the three-way switching valve (9) is connected in close proximity to the indoor heat exchanger (5) and the heat exchanger (5)
The first flow control device is controlled by the superheat amount during cooling and the subcooling amount during heating on the outlet side of the air conditioner, and is connected to the second connection pipes (7b) (7c) (7d) on the indoor unit side. . (IQ is the first connection pipe (6b) on the indoor unit side,
(6c), (6d) and the first connecting pipe (6), or
The first branch part consists of a three-way switching valve (8) that is switchably connected to the second connection pipe (7), αυ is the second connection pipe (7b), (7c), (7d) on the indoor unit side. and a second branching part consisting of a second connecting pipe (7), @ is a first branching part Q of the second connecting pipe (7) (a freely openable and closable part connecting the first branching part Q and the second branching part Q). This is a second flow rate control device.

An embodiment of the invention configured in this manner will be described.

First, the case of only cooling operation will be explained using FIG.

That is, as shown by the solid line arrow in the figure, the high temperature and high pressure refrigerant gas discharged from the compressor (1) passes through the four-way valve (2),
After being condensed and liquefied by heat exchange in the heat exchanger (3) on the heat source machine side, it passes through the second connection pipe (7), the second flow rate control device @, and then the second branch Qη and the indoor unit. Pass through the second connection pipes (7b), (7C), and (7d) on the side, and connect to each indoor unit 03.
), (0, (6). Then, each indoor/indoor unit (B
), (C), (L)) The inflowing indoor refrigerant is reduced to a low pressure by the first flow rate control device w1 (9), and is evaporated by exchanging heat with indoor air in the indoor heat exchanger (5). It is gasified and cools the room. Then, this refrigerant in a gas state is transferred to the first connection pipes (6b), (6C), (6C) on the indoor unit side.
d) The air is sucked into the compressor (1) through the three-way switching valve (8), the first branch OQ, the first connection pipe (6), the four-way valve (2) of the heat source device, and the accumulator (4). A circulation cycle is formed, and cooling is performed. At this time, the 10th (8a) of the three-way switching valve (8) is closed, and the 20th (8b) and 30th (8C) are open.

Next, the case of only heating operation will be described using FIG. 2. In other words, the compressor (
1) The high temperature and high pressure refrigerant gas discharged from the 4-way valve (2)
, the first connection pipe (6), the first branch αQ, the three-way switching valve (8), the first connection pipe on the indoor unit side (6b),
(6c), (6d), and each indoor unit (mouse, (0
), it exchanges heat with indoor air, condenses and liquefies, heating the room. Then, the refrigerant in the liquid state passes through the first flow rate control device (9), flows into the second connection pipe (7b) on the indoor unit side, and the second branch part α, where they join together. It further passes through the second flow rate control device @, where the pressure is reduced to a low-pressure two-phase state by either the first flow rate control device (9) or the second flow rate control device (to). Then, the refrigerant that has been reduced in pressure to a low pressure flows into the heat source side root heat exchanger (3) of the heat source device (5) through the second connection pipe (7), where it exchanges heat and evaporates to become a gas. , 4-way valve of heat source machine (2)
, constitutes a circulation cycle in which the air is sucked into the compressor (1) via the accumulator (4), and performs heating operation. At this time, the three-way switching valve (8) is opened and closed in the same manner as in the case of only the cooling operation described above.

A case in which heating is the main component in simultaneous cooling and heating operation will be described with reference to FIG. That is, as shown by the dotted arrow in the figure, the high temperature and high pressure refrigerant gas discharged from the compressor (1) is
It is sent to the relay machine (barrel) through the first connection pipe (6), and then to the first branch αQ, the three-way switching valve (8), and the first connection pipe (6b) on the indoor unit side (6C). The air then flows into the indoor units (B) and (C) that are to be heated, exchanges heat with the indoor air in the indoor heat exchanger (5), and is condensed and liquefied to heat the room. The refrigerant passes through the first flow control device (9) which is in a nearly fully open state, is slightly depressurized, and flows into the second branch part αη.A part of this refrigerant flows through the first connection on the indoor unit side. It passes through the pipe (7d) and enters the indoor unit (6) to be cooled, and then enters the first flow control device (
After entering 9) and being depressurized, it enters the indoor heat exchanger (5) to exchange heat and evaporate into a gas state, which cools the room.
It flows into the second connecting pipe (7) via the three-way switching valve (8).

On the other hand, the other refrigerant flows into the second connection pipe (7) through the second branch Ql) and the second flow rate control device Oka, and joins with the refrigerant that has passed through the indoor unit ■ to be cooled. fever 111
It flows into the first heat source side fence heat exchanger (3), exchanges heat, and evaporates into a gas state. Then, the refrigerant forms a circulation cycle in which the refrigerant is sucked into the compressor (1) through the four-way valve (2) of the heat source device and the accumulator (4), thereby performing heating-dominant operation. At this time, the 10th (8a) of the three-way switching valve (8) connected to )(2) of the indoor unit is closed, and the 20th (8b), g
30 (8C) is open, and the 20th circuit of the indoor unit (b)
(8b) is a closed circuit, and the 10th (8a) and 30th (8c) are open circuits.

A case in which cooling is the main component in simultaneous heating and cooling operation will be described with reference to FIG. 4. That is, as shown by the solid arrow in the figure, the high temperature and high pressure refrigerant gas discharged from the compressor (1) is
An arbitrary amount of heat is exchanged in the heat exchanger (3) on the heat source side, resulting in a two-phase high temperature and high pressure state, which is sent to the repeater (E) via the second connection pipe (7). Then, a part of this refrigerant passes through the first branch αQ1 three-way switching valve (8) and the first connection pipe (6d) on the indoor unit side, and flows into the indoor unit (■) to be heated. It exchanges heat with the indoor air in the inner heat exchanger (5), condenses and liquefies it, and heats the room. Furthermore, it flows into the second branch αη through the first flow rate control device (9) which is in the fully open state. On the other hand, the remaining refrigerant passes through the second flow rate control device U (fully open state), flows into the second branch part Qη, and joins with the refrigerant that has passed through the indoor unit to be heated. and,
Second branch part αη, second connection pipe on the indoor unit side (7b)
The water passes through (7c) and flows into each indoor unit (g) and (2).

The refrigerant that has flowed into each of the indoor units (B) and (C) is then reduced to a low pressure by the first flow control device (9), flows into the indoor heat exchanger (5), and exchanges heat with the indoor air. It evaporates and becomes gas, cooling the room. Furthermore, this gaseous refrigerant is transferred to the first connection pipes (6b) and (6c) on the indoor unit side.
), three-way switching valve (8), first branch part atS, first connection pipe (to 6), four-way valve (2) of heat source equipment, accumulator (
A circulation cycle is configured in which the air is sucked into the compressor (1) via step 4), and air-conditioning-based operation is performed. At this time, indoor unit @(C
) (2), the tenth (8a) of the three-way switching valve (8) connected to
) to (8c) are opened and closed in the same way as in heating-based operation.

In addition, in the above embodiment, a three-way switching valve (8) is provided to connect the first connection pipes (6b), (6c), (6d) on the indoor unit side,
It is connected to the first connection pipe (6) or the second connection pipe (7) in a switchable manner, but as shown in FIG.
Even if two solenoid valves, zero-force on-off valves, etc. are provided and switching control is performed as described in t2 above, similar effects can be obtained.

〔Effect of the invention〕

As explained above, the air conditioner of the present invention is one in which one heat source device and a plurality of indoor units are connected via the eleventh and second connection pipes. A first branch part in which one of the plurality of indoor units is switchably connected to the first connection pipe or the second connection pipe, and the other of the plurality of indoor units is connected to a first flow rate connected to the indoor unit. Connecting to a second branch part connected to a second connecting pipe via a control device, and further connecting the first branch part and the second branch part via a second flow rate control device. , a repeater incorporating the first branch part, the second flow rate control device, and the second branch part is interposed between the heat source machine and the plurality of indoor units, and Since the first and second connecting pipes are connected to the repeater, a plurality of indoor units can be selectively operated for cooling and heating at the same time.

In addition, a repeater can be used to connect a heat source device and multiple indoor units.
Install between the main extension pipes, connect the heat source equipment and the repeater, and connect the repeater and multiple indoor units to each indoor unit.
This can be done with only two pipes, one for the outward and one for the return journey, and the advantages are that the long connection pipes connecting the heat source unit and multiple indoor units are reduced to two compared to the conventional method, and the installation work is easy and the cost is low.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to a first embodiment of the present invention, and FIG. 2 is an operational status diagram of only cooling or heating of the embodiment shown in FIG. 1. Fig. 3 is a diagram of the operation state of the heating main body (when the heating operation capacity is larger than the cooling operation capacity) of the embodiment shown in Fig. 1, and Fig. 4 is the cooling main main unit of the embodiment shown in Fig. 1. (When the cooling operation capacity is larger than the heating operation capacity)
FIG. 5 is an overall configuration diagram centered on the refrigerant system of an air conditioner according to another embodiment of the present invention. In the figure, (G) is the heat source machine, [F]), C), ■) are the indoor units, [F]) is the repeater, (1) is the compressor, (2) is the four-way valve of the heat source machine, (3) is a heat exchanger on the heat source equipment side, (4) is an accumulator, (5) is an indoor heat exchanger, (6) is a first connection pipe, and (6b). (6c) and (6d) are the first connection pipes on the indoor unit side;
(7) is the second connection pipe, (7b), (7c),
(7d) is the second connection pipe on the indoor unit side, (8) is the three-way switching valve, (9) is the first flow rate control device, QI is the first branch, and (b) is the second branch. , @ is the second flow rate control device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. One heat source machine consisting of a compressor, a four-way valve, a heat exchanger on the heat source side, an accumulator, etc., and a plurality of indoor units consisting of an indoor heat exchanger, a first flow rate control device, etc. , connected via a second connection pipe, with a first branch part formed by connecting one of the plurality of indoor units to the first connection pipe or the second connection pipe in a switchable manner; , the other of the plurality of indoor units is connected to a second branch part formed by connecting to a second connection piping via a first flow rate control device connected to the indoor unit, and further a second flow rate is controlled. A repeater that connects the first branch part and the second branch part through a control device and incorporates the first branch part, the second flow rate control device, and the second branch part, The heat source device is interposed between the heat source device and the plurality of indoor units, and the heat source device and the relay device are connected by extending first and second connection pipes. An air conditioner that can be used for cooling and heating simultaneously.