JPH0311276A - air conditioner - Google Patents

Abstract

PURPOSE:To enable facility by connecting a plurality of indoor machines to one heat source machine and selectively conducting air conditioning at every indoor machine and simultaneously performing cooling in one indoor machine and heating in the other indoor machine. CONSTITUTION:In a device in which one heat source machine A composed of a compressor 1, a four-way valve 2, a heat source machine side flat exchanger 3, an accumulator 4, etc., and a plurality of indoor machines B, C, D consisting of indoor-side heat exchangers 5, flow controllers 9, etc., are connected through connecting pipings 6, 7, a gas-liquid separator 12 is installed midway on the connecting piping 7, a branching section 10 with valve gears 8 connecting one of a plurality of the indoor machines to the connecting piping 6 or the connecting piping 7 in an exchangeable manner and a branching section connecting the other of a plurality of the indoor machines to the connecting piping 7 through flow controllers 9 connected to the indoor machines are bonded with the gas-liquid separator 12, and a flow controller 13 is connected between the branching section 11 and the gas-liquid separator 12. Accordingly, the flow rate of a refrigerant and the states of a gas end a liquid are controlled properly, and cooling or heating can be operated selectively in the indoor machines and cooling in one of a plurality of the indoor machines and heating in the other can be worked simultaneously.

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 perform heating and cooling selectively for each indoor unit, and can 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 of them are 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 areas that require cooling, or conversely, heating is performed in areas that require cooling. There were problems such as air conditioning being performed in places where air conditioning was required.

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 aims to solve the above-mentioned problems.
In this system, multiple indoor units are connected to one heat source unit, and each indoor unit selectively performs air conditioning and heating, and one indoor unit performs cooling while the other indoor unit performs 1) If it is installed in a large building so that it can be done at the same time, even if the air conditioning load is significantly different between the interior department and part of Verimeta, or between the general office and a computer room or other OA room. The aim is to obtain a multi-room heat positip type air conditioner that can accommodate each type of air conditioner.

[Means to solve the problem]

One heat source device 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. 1. Second
A gas-liquid separator is provided in the middle of the second connection pipe, and one of the plurality of indoor units is connected to the first connection pipe or the second connection pipe. A first branch section equipped with a switchably connected valve device and the other of the plurality of indoor units are connected to the second connection pipe via a first flow control device connected to the indoor unit. A second branch section connected to the second branch section is connected to the gas-liquid separation device, and a second flow rate control device is further connected between the second branch section and the gas-liquid separation device. .

[Effect]

In this invention, in the case of heating mainly in simultaneous cooling and heating operation, high-pressure gas cooling is introduced from the first branch of the first connecting pipe to each indoor unit to be heated, and then 1. A portion of the refrigerant flows from the second branch into the indoor unit to be cooled, and then flows from the first branch into the second connection pipe. Meanwhile, the remaining refrigerant is
flow] flows into the gas-liquid separation device through the control device, merges with the refrigerant that has passed through the cooling indoor unit, flows into the second connection pipe, and returns to the heat source device.

In addition, in the case of mainly cooling, the high-pressure gas is subjected to arbitrary heat exchange with the M source equipment, and flows into the gas-liquid separation device from the second connection pipe as a two-phase state, and the separated gaseous refrigerant is transferred to the first The air is introduced into the indoor unit to be heated through the branch part, performs heating, and flows into the second branch part. .

On the other hand, the remaining liquid refrigerant that flows into the gas-liquid separator and is separated passes through the second flow control device and joins with the refrigerant that has passed through the indoor unit intended for heating at the second branch to cool the room. The air flows into each indoor unit to perform cooling, and then is guided from the first branch through the first connection pipe to the heat source equipment 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 connecting pipe and the first branch to each indoor unit, heated, and then passed from the second branch to the second connecting pipe to the heat source. Return to the machine.

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

〔Example〕

Embodiments 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 are
This figure shows the operating state during cooling/heating operation in one embodiment of the figure. Fig. 2 shows the operating state of cooling or heating only, and Figs. 3 and 4 show the operation of simultaneous cooling/heating operation. FIG. 3 is an operation state diagram showing a heating-dominant mode (when the heating operating capacity is larger than the cooling operating capacity), and FIG. 4 is an operating state diagram showing a cooling-dominant mode (when the cooling operating capacity is larger than the 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 R, but the same applies to a case in which two or more indoor units are connected. .

In Figure 1, (A+ is a heat source device, (Bl, (C1,
(As will be described later, Di is an indoor unit that is connected in parallel to each other and has the same configuration. (As will be described later, El is a first branch, a gas-liquid separation device, a second flow rate control device, and a second flow control device. (1) is a compressor, (1) is a repeater with built-in branch parts, (1) is a
2) is a 4-way valve that switches the refrigerant flow direction of the heat source equipment, (3)
is the heat exchanger on the heat source machine side, (4) is the accumulator, and 8! The heat source M (Al) is connected to the heat source M (]) to (3).

(5) is three indoor heat exchangers, (6) is a heat source machine (Al
The first connection pipes connecting the four-way valve (2) and the relay [fE], (6b) (6(-,), (6d,) are the indoor side of the indoor unit (tel, (C1, (DI)), respectively. Connect the heat exchanger (5) and repeater (-), and connect the first connection pipe (6).
), (A) is the first connection pipe on the indoor unit side corresponding to
The second connection pipe connecting the (7b) and (7c)
, (7d) are the indoor units (Bl, fcl,
CDI indoor heat exchanger (5) and repeater (Tj:I
The second connection pipe on the indoor unit side that connects Yc and corresponds to the second connection pipe (7), (8) is the first connection pipe on the indoor unit side (
6b), (6c), and (6d), a three-way switching valve that is switchably connected to the first connecting pipe (6) or the second connecting pipe (7), and (9) is the indoor heat exchanger. (5
) is connected in close proximity to the outlet side of the indoor heat exchanger (5) and is controlled by Super Heat IT during cooling and subcooling during heating, and the second flow control device on the indoor unit side.
It can be connected to the connecting pipes (7b), (7c), and (7d). 00) is the first connection pipe (6b) on the indoor unit side
, (6c), (6d) and the first connection pipe (6
) or the first branch part consisting of a three-way switching valve (8) that is switchably connected to the second connection pipe (7), (old) is the second connection pipe (7b), (7c) on the indoor unit side. ,
(7d) and the second connecting pipe (7), the second branch part uz is a gas-liquid separator installed in the middle of the second connecting pipe (7), and the gas layer part is a three-way switching valve. (8) No. 10 (
The liquid layer part is connected to the second branch part (a). (131 is a second flow control device that can be opened and closed) connected between the gas-liquid separation device (IZ and the second branch).

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 side, the second connection pipe (7) and the gas-liquid separator UZ.

It passes through the second flow control device G31 in this order, and further passes through the second branch part (1υ, the second connection pipe (7b) on the indoor unit side), (
7C).

(7d), each indoor unit fEIl, ICI,
(Flows into DI. Then, each indoor unit (Bl, (C
1. (The refrigerant that has flowed into Di is connected to each indoor heat exchanger (5)
The pressure is reduced to a low pressure by the first flow rate control device (9) controlled by the amount of superheat of the output [], and the indoor heat exchanger (5) exchanges heat with the indoor air to evaporate and gasify the indoor air. Cool down. This gaseous refrigerant is then transferred to the first connection pipe (6b), (glare), (feed) on the indoor unit side.
is a three-way switching valve (8).

First branch α0. First connection pipe (6), heat source device 4
Compressor (1) via valve (2) and accumulator (4)
A circulation cycle is configured in which air is sucked into the air, and cooling operation is performed. At this time, the 10th (a) of the three-way switching valve (8) is closed;
The 20th (8b) and the 30th (8C) are open circuits.

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 connecting pipe 16), the first branch part -, the three-way switching valve (8), the first connecting pipe on the indoor unit side (6b),
(6c), (ω), and each indoor unit [bl
, FC+, (flows into the DI, exchanges heat with the indoor air, condenses and liquefies, and heats the room.The refrigerant in this liquid state is then refrigerated depending on the amount of subculture at the outlet of each indoor heat exchanger (5). through a first flow control device (9) to be controlled;
Second connection pipe on the indoor unit side (7b), (7c),
(7d) It flows into the second branch OD, merges with it, and further passes through the second flow rate control device 031, where it is connected to either the first flow rate control device (9) or the second flow rate control device (131). On the other hand, the pressure is reduced to a low-pressure two-phase state.Then, the refrigerant reduced to a low pressure passes through the gas-liquid separator u2) and the second connection pipe (7) to the heat source machine (Al heat source machine side heat exchanger). vessel(
3), the refrigerant that evaporates through heat exchange and becomes a gas forms a circulation cycle in which it is sucked into the compressor (1) through the four-way valve (2) of the heat source machine and the accumulator (4). Perform 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 transferred to the first connection pipe (6
) to the relay ffi fEl and the first branch i'! 01, the three-way switching valve (8), the first connection pipe (6b) on the indoor unit side, and (f5c), and flows into each room Iff (Bl, (C)) used for heating, and performs indoor heat exchange. It exchanges heat with indoor air in the container (5) and is condensed and liquefied to heat the room.

This condensed and liquefied refrigerant is then transferred to each indoor heat exchanger (
5) It passes through the first flow rate control device (9) which is controlled by the subcooling amount at the outlet and is in an almost fully open state, and is slightly depressurized before flowing into the second branch 0D. A part of this refrigerant passes through the second connecting pipe (7d) on the indoor unit side and enters the room 1fi fD+ to be cooled, and is controlled by the amount of superheat at the outlet of the indoor heat exchanger (5). After entering the flow rate control device (9) of No. 1 and being depressurized, it enters the indoor heat exchanger (No. 5).
), it exchanges heat, evaporates, becomes a gas, cools the room, and flows into the gas-liquid separator Q2+ via the three-way switching valve (8).

On the other hand, other refrigerants flow into the gas-liquid separator qz through the second branch part αD and the second flow rate control device αJ, which is controlled by the openable and closable high and low pressure values of the second connecting pipe, and are used for cooling. It joins with the refrigerant that has passed through the indoor fi (DI), flows into the second connection pipe (7), flows into the heat source unit side heat exchanger (3) of the heat source unit (c), exchanges heat, and evaporates. Then, the refrigerant forms a circulation cycle in which it is sucked into the compressor (1) through the four-way valve (2) of the heat source device and the accumulator (4), and performs heating-based operation.At this time, ,
Indoor @ (Hl, (3-way switching valve connected to C1 (
8) The 10th (8a) is a closed circuit, the 20th (8b) and the 3rd
0 (8c) is open, and indoor II (Di 20th
(8b) is a closed circuit, and the 10th (written) and 30th (written) 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 transferred to the 1 heat source side Iso heat exchanger (
In 3), an arbitrary amount of heat is exchanged, resulting in a two-phase high temperature and high pressure state, which is sent to the gas-liquid separator 03 of the relay M fEl via the second connection pipe (7). Here, the refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant is transferred to the first branch part α0. It passes through the three-way switching valve (8) and the first connection pipe (fed) on the indoor unit side, flows into the indoor unit fDl to be heated, and exchanges heat with indoor air in the indoor heat exchanger (5). It condenses and liquefies and heats the room 4. In addition, the indoor heat exchanger (
5) The first flow is controlled by the sub-cooling amount at the outlet and is in an almost fully open state.It passes through the control device (9) and is slightly depressurized before flowing into the second branch 0υ.

On the other hand, the remaining liquid refrigerant passes through the second branch (Ill, the second flow control device 03+ controlled by the openable and closable high pressure and low pressure values of the second connecting pipe) to the second branch (Old). The refrigerant flows in and joins with the refrigerant that has passed through the indoor unit to be heated. Then, it passes through the second branch αD, the second connection pipe (7b) on the indoor unit side, and (7c) in this order, and passes through the second branch part αD, the second connection pipe (7b) and (7c) on the indoor unit side,
Bl, (flows into C1. Then, in each room [(B1
, (C) is reduced to a low pressure by the first flow control device (9) which is controlled by the amount of superheat at the outlet of the indoor heat exchanger (5), and then transferred to the indoor heat exchanger (5).
), it exchanges heat with indoor air, evaporates and becomes gas, cooling the room. Further, the refrigerant in the gas state is transferred to the first connection pipes (6b) and (6C) on the indoor unit side, the three-way switching valve (8), and the first branch part 00. First connection pipe (6
), a four-way valve (2) of the heat source device, and an accumulator (4) to form a circulation cycle in which the air is sucked into the compressor (1), and air-conditioning-based operation is performed. At this time, the indoor unit (bl= (C
1. (10th (&) of the three-way switching valve (8) connected to the DJ
)) to 30th (8C) can be opened and closed in the same way as heating biological operation. In the above embodiment, a three-way switching valve (8) is provided to connect the first connection pipe (6b) on the indoor unit side, (f5c) , (
connection) and the first connection pipe (6) or the second connection pipe (7), but as shown in Fig. 5, the two solenoid valves ζ301, (31), etc. Even if an on-off valve is provided and connected in a switchable manner as described above, similar effects can be obtained.

〔Effect of the invention〕

One heat source device, such as a compressor, a four-way valve, a heat exchanger on the heat source side, an accumulator, etc., and multiple indoor units, each consisting of an indoor heat exchanger, a first flow rate control device, etc. 1st. Second
A gas-liquid separator is provided in the middle of the second connection pipe, and one of the plurality of indoor units is connected to the first connection pipe or the second connection pipe. Switching - A first branch section equipped with a valve device connected to the iJ function and the other of the plurality of indoor units are connected to the second connection pipe via a first flow rate control device connected to the indoor unit. A second branch part connected to the gas-liquid separator is connected to the gas-liquid separator, and a second flow rate control device is connected between the second branch part and the gas-liquid separator. It is possible to appropriately control the flow rate and gas and liquid status of indoor units, allowing selective cooling or heating for indoor units, and cooling or heating for one of multiple indoor units.
On the other hand, heating can be operated at the same time.

[Brief explanation of drawings]

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. Fig. 2 is a diagram showing the operating state of cooling or heating only in the embodiment shown in Fig. 1, and Fig. 3 is a diagram showing the operating state of the embodiment shown in Fig. 1 mainly in heating (heating operation capacity is larger than cooling operation capacity). case) operating state diagram,
FIG. 4 is an operating state diagram showing the main cooling operation (when the cooling operation capacity is larger than the heating operation capacity) of the embodiment shown in FIG. 1, and FIG. FIG. 2 is an overall configuration diagram centered on the refrigerant system of the device. In the figure, ()\) is heat source device 1 (bl, (C1
, fD+ is an indoor unit, (E) is a repeater, (1) is a compressor,
(2) is the four-way valve of the heat source machine, (3) is the heat exchanger on the heat source machine side,
(4) is an accumulator, (5) is an indoor heat exchanger, (
6) is the first connection pipe, (61)), (6c),
(6d) is the first connection pipe 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 second connection pipe on the indoor unit side. Three-way switching valve, (9n
α0) is the first branch, old)
is the second branch, uz is the gas-liquid separator, (13I is the second
flow control device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] One heat source device 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. 1. In those connected via the second connection pipe, the above-mentioned second
A first branch that includes a gas-liquid separator in the middle of the connecting pipe, and a valve device that connects one of the plurality of indoor units to the first connecting pipe or the second connecting pipe in a switchable manner. and a second branch section formed by connecting the other of the plurality of indoor units to the second connection pipe via a first flow rate control device connected to the indoor unit. An air conditioner, further comprising a second flow rate control device connected between the second branch section and the gas-liquid separation device.