JPH0351671A - Air conditioner - Google Patents

Abstract

PURPOSE:To improve a distributing characteristic of liquid refrigerant by a method wherein a heat exchanging part for performing a beat exchanging operation between a bypassing pipe and the second branch part between the third flow rate control device and a check valve is provided. CONSTITUTION:The first branch part 10 provided with a three-way changing- over valve 8 for connecting one of indoor devices B to D with either one of the first or second connection pipes 6 and 7 in such a way as it may be changed over, and the second branch part 11 for connecting the other indoor device to the second connector pipe 7 through the first flow rate control device 9 are connected through the second flow rate control device 13. One end of a bypassing pipe 14 is connected to the second branch part 11 and the other end of the bypassing pipe 14 is connected to the first and second connector pipes 6 and 7 through the third flow rate control device 15 and to the first and second connector pipes 6 and 7 through check valves 17 and 18 allowing communication only toward the first and second connector pipes 6 and 7. A heat exchanging part 16 for performing a heat exchanging operation between the bypassing pipe 14 and the second branch pipe 11 between the third flow rate control device 15 and the check valves 17 and 18 is provided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] 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, and in particular, the present invention relates to a multi-room heat pump air conditioner in which a plurality of indoor units are connected to one heat source unit. This relates to an air conditioner that can selectively perform heating and cooling for each 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 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 may be performed in areas that require cooling, or vice versa. There was a problem where air conditioning was used in places that needed heating.

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 the general office and a computer room, etc., which is a particular problem. .

This invention was made in order to solve the above-mentioned problems, and it is possible to connect multiple indoor units to one R8 power source unit and selectively control heating and cooling for each indoor unit. 10,000 indoor units can perform cooling while the other indoor unit can perform heating at the same time (if this is possible and installed in a large building,
The interior department, part of Verimeter, or general office department,
To provide a multi-room heat pump type air conditioning system capable of handling even if the air conditioning loads vary significantly in OA rooms such as computer rooms.

[Means to solve the problem]

This invention consists of one heat source machine including a compressor, a four-way valve, a heat exchanger on the heat source machine side, an accumulator, etc., and a plurality of heat source machines including an indoor heat exchanger, a first flow 1 control device, etc. In the case where two or more indoor units are connected via the first and second connection piping, it is possible to switch some of the plurality of indoor units to the first connection piping or the second connection piping. A first branching section equipped with a valve device connected to the indoor unit 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. (This end is connected to the second branch part through the second flow rate control device.)
The branch part f is connected, and the other end is connected to a third flow rate control device,
The third flow rate control device includes a bypass pipe connected to the first and second connecting pipes via a check valve that allows flow only to the first and second connecting pipes. The present invention is characterized in that a heat exchange section is provided for exchanging heat between the bypass pipe between the check valve and the second branch pipe.

[Effect]

In this invention, when heating is the main component in C1 simultaneous cooling and heating operation, high-pressure gas refrigerant is introduced from the first connection pipe and the first branch to each indoor unit that is to be heated, and then the refrigerant 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. - The remaining refrigerant flows into the gas-liquid separation device through the second flow rate control device, joins with the refrigerant that has passed through the cooling indoor unit, flows into the second connection pipe, and returns to the heat source device. Part of the refrigerant is injected from the above-mentioned second branch via the bypass pipe, heat is exchanged in the heat exchange section, and the subcool is applied to the indoor unit that is trying to cool the air conditioner. Inflow.

In addition, in the case of mainly cooling, high-pressure gas is exchanged with an arbitrary amount of heat using a heat source device, and the gaseous refrigerant is introduced into a two-phase state from the second connecting pipe through the first branch to the indoor unit that is to be heated. The air then flows into the second branch for heating. - The remaining liquid refrigerant passes through the second flow rate control device, joins with the refrigerant that has passed through the indoor unit to be heated at the second branch, and flows into each indoor unit to cool the room. Thereafter, the heat is guided from the first branch through the first connection pipe to the heat source machine and returns to the compressor. In the process of flowing a part of the refrigerant from the second branch part to the first connection pipe via the bypass pipe, heat exchange is performed in the heat exchange part, and the refrigerant in the second branch part is The air flows into the indoor unit that is trying to cool down the air by applying sufficient subcooling.

(In case of heating operation [/J only, the refrigerant is supplied from the heat source machine to the
The connecting pipe passes through the first branch and connects four people to each indoor unit.
It is heated and returns to the heat source unit from the second branch through the second connection pipe.

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

Furthermore, in the process of flowing a portion of the refrigerant from the second branch section to the first connection pipe via the bypass pipe, heat exchange is performed in the heat exchange section to cool the refrigerant in the second branch section. One light minute of subcooling flows into the indoor unit that is trying to cool the air.

〔Example〕

Examples 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.

In Figure 1, the prisoners are heat source machines, (B), (Cri,
(D) is an indoor unit connected in parallel to each other, each having the same configuration as described later. (G) is a repeater that incorporates a first branch part, a second flow rate control device, a second branch part, a gas-liquid separation device, and a heat exchange part, 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 (A). (5) is the three indoor heat exchangers, (6) is the first connection pipe that connects the four-way valve (2), which is the root cause of the heat source, and the repeater (to), (6b), (6c),
(6d) Gi'ct'L-inner machine (B), (C)
■) Connect the indoor heat exchanger (5) and the repeater (g),
A first connection pipe on the indoor unit side corresponding to the first connection pipe (6), a second connection pipe that connects the heat source machine side heat exchanger (3), which is the root cause of the heat source, and the relay post, (7b) , (
7c) and (7d) are indoor units (B) iQ and (7d), respectively.
Connect the indoor heat exchanger (5) of 1 connection pipe (6b),
(6c), (6d) and the first connection pipe (6)
Alternatively, the second connecting pipe (a three-way switching valve that can be switched to the power side and connected to the power side, (9) is connected close to the indoor heat exchanger (5) and is connected to the outlet side of the indoor heat exchanger (5) The first flow rate control device is controlled by the superheat amount during cooling and the subcooling amount during heating, and the second connection pipe on the indoor unit side (
7b), (7c), and (7d). (
1G is the first connection pipe (6b), (6c) on the indoor unit side
, (6d) and a three-way switching valve (6d) that is switchably connected to the first connection pipe (6) or the second connection pipe (7).
8) The first branch part consisting of %O is the second connection pipe (
7) is a gas-liquid separation device installed in the middle, the gas layer part is connected to No. 10 (8a) of the three-way switching valve (8), and the liquid layer part is connected to the second branch part (b). It is connected. q3 is the second flow rate control device with an opening/closing point connected between the gas-liquid separator @ and the second branch 0υ, and α fathom is the second branch θυ
and the first connection pipe (6) and the second connection pipe (
(G) is a third flow rate control device installed in the middle of bypass piping 04, αQ is installed downstream of the third flow rate control device in the bypass piping α, and
The second connection pipe (7) on each indoor unit side at branch part 0υ of
b).

(7c), qη is a heat exchanger that performs heat exchange with the confluence part of (7d), and qη is the heat exchanger part α0 of the bypass pipe and the first
A first check valve provided between the connecting pipe (6) of
81 is the heat exchange part αG of the nokui pass piping αG and medicine distribution 2
The first check valve (1) is provided between the connecting pipe (7) and the first check valve (1
7), and the first and second check valve aη ports are both connected from the heat exchanger αG side to the first and second connection pipes (6) and (7) side. An embodiment of the present invention configured in this way (details will be explained below) in which the refrigerant is allowed to flow only to the

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

In other words, the compressor (1) shown in the same figure (as shown by the arrow)
The high-temperature, high-pressure refrigerant gas discharged from the refrigerant gas passes through the four-way valve (2), undergoes heat exchange in the heat exchanger (3) on the heat source side, and is condensed and liquefied. Device C1a, second
flow control device (to), and then the second branch (to).
6), second connection pipe on the indoor unit side (7b), (7c
).

(7d), and each indoor unit (8), (('), (
D). Then, each indoor unit +8), ((”),
The refrigerant that has flowed into the first flow rate control device (-) controlled by the outlet of each indoor heat exchanger (5)
9), the air is reduced to a low pressure by the indoor heat exchanger (5), where it exchanges heat with indoor air, evaporates, and gasifies to cool the room. Then, this refrigerant in a gas state is transferred to the first connection pipes (6b), (6c), (6d) on the indoor unit side.
, three-way switching valve (8), first branch tilt, first connection pipe (6), four-way valve of heat source equipment (2), accumulator (4)
) to form a circulation cycle in which air is sucked into the compressor (1) to perform cooling operation. At this time, the 10th (8a) of the three-way switching valve (8) is closed, the 20th (8b) and the 30th (8a) are closed.
8c) is open circuited.

Also, during this cycle, a part of the refrigerant that has passed through the second flow rate control device 03 enters the bypass pipe α and is reduced in pressure to a low pressure by the third flow rate control device a5. And the second
The second connection pipe (7b) on each indoor unit side of the branch part 01)
, (7c), and (7d), the refrigerant that has evaporated through heat exchange with the confluence section passes through the first check valve qη, and then passes through the first check valve qη.
The water enters the connecting pipe (6) of the heat source device, passes through the four-way valve (2) of the heat source machine, the accumulator (4), and is sucked into the compressor (1). At this time, the first connection pipe (6) is at low pressure, and the second connection pipe (7)
Since the pressure is high, it inevitably flows to the first check valve αη side.

- 10,000, the refrigerant in the second branch section 01), which has been cooled by heat exchange in the heat exchange section αG and has been sufficiently subcooled, flows into the indoor units (B), (C), CD) that are being cooled. Next, the case of only heating operation will be described using FIG. 2. That is, as shown by the dotted line arrow in the figure f, the high temperature and high pressure refrigerant gas discharged from the compressor (1) is passed through the four-way valve (2).
), the first connection pipe (6), the first branch part al,
Thirty thousand switching valve (8), first connection pipe on the indoor unit side (6b)
, (εc), (6d), and each indoor unit (B
).

C), flows into (2), exchanges heat with indoor air, condenses and liquefies, heating the room. Then, this liquid refrigerant passes through the first flow rate control device (9) that is controlled by the subcooling amount at the outlet of each indoor heat exchanger (5), and then passes through the second connection pipe (7b) of the indoor reserve. ), (7c), and (7d) flow into the second branch (b), merge, and further pass through the second flow control device (to), where it flows into the first flow control device (
9) or the second flow rate control device, the pressure is reduced to a low pressure two-phase state. The refrigerant, which has been reduced in pressure to a low pressure, passes through the gas-liquid separator (Foundation) and the second connection pipe (7), and then flows into the heat source unit side heat exchanger (3) of the heat source unit (A) for heat exchange. The refrigerant that has evaporated into a gas state is
Compressor (1) via valve (2) and accumulator (4)
A circulation cycle is constructed in which air is inhaled, and heating operation is performed. At this time, the three-way switching valve (8) is opened and closed as in the case of only the cooling operation described above.

Worrying point 3 when heating is the main component in simultaneous cooling and heating operation
This will be explained using figures.

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 repeater ■), and then to the first branch α
Q. Three-way switching valve (8), first connection pipe on the indoor unit side (6)
b) and (6c), flow into each indoor unit (B) and (C) to be heated, and enter the indoor heat exchanger (5).
), it exchanges heat with the indoor air and is condensed and liquefied, heating the room.

This condensed and liquefied refrigerant is then transferred to each indoor heat exchanger (
B), (C) The flow is controlled by the subcooling amount f at the outlet, passes through the first flow rate control device (9) which is in an almost fully open state, and is slightly depressurized before flowing into the second branch part 01). Then, a part of this refrigerant passes through the second connection pipe (7d) on the indoor unit side and enters the indoor unit CD which is attempting to cool the room, and is trapped in the amount of superheat at the outlet of the indoor heat exchanger (2). After entering the first flow rate control device (9) where the pressure is reduced, it enters the indoor heat exchanger (5) where it exchanges heat and evaporates into a gas state that cools the room, and then the three-way switching valve (8) Gas-liquid separation device 0 through
3f flows in.

- 10,000, the other refrigerant flows into the gas-liquid separation device 02 through the second branch part aη and the second flow rate control device (to) which is controlled by the openable and closable high pressure and low pressure values of the second connection pipe. The refrigerant that has passed through the indoor unit D) to be cooled joins with the second refrigerant.
The refrigerant flows into the heat source machine side heat exchanger (3) of the heat source machine (4), exchanges heat, and evaporates into a gas state. A circulation cycle is formed in which air is sucked into the compressor (1) 6ζ via the valve (2) and the accumulator V-tor (4), and heating-based operation is performed.At this time,
The 10th C&L) of the three-way switching valve (8) connected to the indoor units (B) and (c) is closed, and the 20th (8b) and 30th (8th)
c) is closed, and the 20th (8b) of indoor unit (2)
is closed, and the 10th (&L) and 30th (8c) are open.

Also, during this cycle, some of the liquid refrigerant is transferred to the second connection pipes (7b), (7c), (7d) on each indoor unit side.
The refrigerant enters the bypass pipe α◆ from the confluence part, is reduced to a low pressure by the third flow control device (A), and undergoes heat exchange and evaporation in the heat exchange part αG.The refrigerant passes through the second check valve port. Then, the refrigerant enters the second connecting pipe (power), and the heat exchanger (3) on the side of the heat source machine after the heat source flows in, exchanges heat, evaporates, and becomes a gas. It is sucked into the compressor (1) through the valve (2) and the accumulator (4).At this time, the first connecting pipe (6) is at high pressure and the second connecting pipe (7) is at low pressure, so Flow through the second check valve (181@I).

-10,000 The refrigerant in the second branch O◇, which has been cooled by heat exchange in the heat exchange section 00 and has been sufficiently subcooled, flows into the indoor unit D) which is to be cooled.

A case in which air conditioning is mainly used in simultaneous heating and cooling operation will be explained using FIG. 4. That is, as shown by the pointed 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 source side wall heat exchanger (3), resulting in a two-phase high temperature and high pressure state, and the second connection pipe (by force, the relay machine (
G) is sent to the gas-liquid separator Q Pier. And here,
The separated gaseous refrigerant is separated into a gaseous refrigerant and a liquid refrigerant, and the separated gaseous refrigerant is passed through the first branch (IC1 30,000 switching valve (8), then the first connecting pipe (6d) on the indoor unit side, in order) to heat the room. The air flows into the indoor unit 01), exchanges heat with indoor air in the indoor heat exchanger CD), condenses and liquefies, and heats the room. Further, it passes through the first flow rate control device (9) which is controlled by the subcooling amount at the outlet of the indoor heat exchanger D) and is in an almost fully open state, and is slightly depressurized before flowing into the second branch section (6). - The remaining liquid refrigerant flows into the second branch qυζ through the second branch Uυ and the second flow control device CI3, which is controlled by the high and low pressure values that can be opened and closed in the second connecting pipe. Then, it joins with the refrigerant that has passed through the indoor unit D) to be heated. Then, the second branch part 0η, the second connection pipe on the indoor unit side (
7b) and (7c) in order, and connect each indoor unit (B).
, flows into (C). And each indoor unit (B), (
The refrigerant that has flowed into C) is transferred to the indoor heat exchanger (B), (C
) The first flow rate control device (9) which controls the amount of superheat at the outlet (9)I is reduced to a lower pressure, exchanges heat with indoor air, evaporates and gasifies, and cools the room. Furthermore, this refrigerant in a gas state is transferred to the first connection pipe (6b) on the indoor unit side, (6c) the three-way switching valve (8), the first branch part α1, the first connection pipe (6), 4-way valve of heat source machine (
2) A circulation cycle is formed in which the air is sucked into the compressor (1) via the accumulator (4), and three cooling-based operations are performed. At this time, the 10th (8a) to 30th (8th) of the three-way switching valve (8) connected to the indoor unit +B), (C), CD)
c) is opened and closed in the same way as in heating-based operation.

Also, during this cycle, some of the liquid refrigerant enters the bypass pipe α from the confluence part of the second connection pipe on each indoor unit side, is reduced to a low pressure by the third flow rate control device (A), and is heat exchanged. At section αG, the refrigerant that has undergone heat exchange and evaporated is passed through the first check valve α.
η, enters the first connecting pipe (6), passes through the four-way valve (2) of the heat source device, the accumulator (4), and is sucked into the compressor (1). At this time, the first connection pipe (6) is at low pressure, and the second
connecting pipe (force is inevitable due to high pressure (this first check valve α
7) Distribute @. - 10,000, the above-mentioned second branch part 0 which is cooled by heat exchange in the heat exchange part α0 and is sufficiently subcooled.
]) is used in the indoor units (B) and (C) that are trying to cool the room.
).

In addition, in the above embodiment, a three-way switching valve (8) is provided to connect the first connection pipes (6bl, (6c), (6) on the indoor unit side
d) is switchably connected to the first connecting pipe (6) or the second connecting pipe (7), but as shown in Figure 5, the opening and closing of these two solenoid valves ω, 3υ, etc. Even if a valve is provided and connected in a switchable manner as described above, similar effects can be obtained.

〔Effect of the invention〕

As explained above, the air conditioner of the present invention includes a compressor, a four-way valve, a heat exchanger on the heat source side, an accumulator, etc. A plurality of indoor units consisting of devices, etc. are connected to the first. In the one connected via the second connection pipe, the first connection pipe includes a valve device that connects a part of the plurality of indoor units to the first connection pipe or the second connection pipe in a switchable manner. and a second branching part formed by connecting the other of the plurality of indoor units to the second connecting pipe via the first flow rate control device connected indoors. One end is connected to the branch part of the upper drug 2, and the other end allows flow only to the third flow rate control device and the first and second connection piping sides. A check valve connected to the first and second connecting pipes is provided, and a check valve is provided between the third flow rate control device and the check valve. and the second branch.Therefore, heating and cooling can be performed selectively, and one indoor unit can be used for cooling, and the other indoor unit can be used for heating. This can be done at the same time, and the liquid refrigerant can be sufficiently subcooled before being distributed to the indoor units, improving the distribution of the liquid refrigerant.

[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) in one embodiment shown in FIG. 1, and FIG. 5 is an air conditioner according to another embodiment of the present invention. FIG. 2 is an overall configuration diagram centered on the refrigerant system. In the figure, (A) is a heat source device, (B), (Cri), (11
3 is an indoor unit, (Company) is a repeater, (1) is a compressor, (2) 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 the accumulator, (5) is the indoor heat exchanger, (6)
is the first connection pipe (6b). (6cL (6d) is the first connection pipe on the indoor unit side, (7)
are the second connection pipes, (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 control device, Ql is the first branch, (6
) is the second branch, (2) is the second flow control device, qI
9 is the bypass pipe, 0!19 is the third flow rate control device, 0
0 is a heat exchange part, C17), and Gf9 are first and second check valves. In addition, in the figures, the same reference numerals indicate the same or equivalent 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. 2nd
A first connection pipe that is connected via a connection pipe, the first unit having a valve device that connects one of the plurality of indoor units to the first connection pipe or the second connection pipe in a switchable manner.
and a second branch part formed by connecting the other of the plurality of indoor units to the second connection pipe via a first flow control device connected to the indoor unit. One end is connected to the second branch, and the other end allows flow only to the third flow control device and the first and second connecting pipes. a bypass pipe connected to the first and second connection pipes via a check valve, the bypass pipe between the third flow rate control device and the check valve, and the second branch pipe. An air conditioner characterized by being provided with a heat exchange section that exchanges heat between the air conditioner and the air conditioner.