JPH05133643A - Air conditioner - Google Patents

Abstract

PURPOSE:To realize a concurrent operation of two room coolers or heaters, an operation of one room cooler or heater and a mixture operation of room cooler/heater by providing two indoor units and one outdoor unit, branching a gas tube for connecting the indoor units and the outdoor unit, and connecting one to a four-way valve through a switching valve, the suction side of a compressor and the other to the four-way valve and the second indoor unit through a switching valve. CONSTITUTION:A gas side tube 12 of a first indoor heat exchanger 9 is branched, one of the branched tubes is connected to a four-way valve 3 and a second indoor heat exchanger 11 through a switching vale 14. The other of the branched tubes of the tube 12 is connected to the valve 3 and the suction side of a compressor 2 through a switching valve 17. An electronic expansion valve 5 of a main flowrate controller and electronic expansion valves 6, 7 of first, second flowrate controllers are provided at the intermediate between an outdoor heat exchanger 4 and the exchangers 9, 10. With the structure, a mixture operation of room heater/cooler can be executed, in addition to a concurrent operation of two room coolers and heaters and an operation of one room cooler/heater by switching the valve 3, controlling of the controllers 5, and 6, 7 and switching of the valves 14, 17 in combination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has two outdoor units.
It relates to a multi-room air conditioner that connects two indoor units, especially with perimeter air conditioning for intelligent buildings,
For air conditioning in the interior zone where the internal load such as OA exhaust heat is high,
It relates to an air conditioner that can be operated at the same time.

[0002]

2. Description of the Related Art In recent years, OA has been used in intelligent buildings and the like.
The internal load increases due to exhaust heat and the like, and it is required to perform cooling in the interior zone while performing heating in the perimeter zone to cope with the external air load even in winter.

Conventionally, this type of air conditioner has been disclosed in Japanese Unexamined Patent Publication No.
The configuration shown in Japanese Patent No. 133761 has been common.
The configuration will be described below with reference to FIG.

As shown in the figure, a compressor 102, heat source side heat exchangers 103a and 103b, and a main use side heat exchanger 104 are provided in a main unit 101 installed in a perimeter zone in a room. The sub-units 105 and 106 have sub-use side heat exchangers 107 and 108, and the heat source side heat exchanger 103.
a, b, main-use side heat exchanger 104, and sub-use side heat exchanger 1
A compressor 10 and a high pressure gas pipe 110, one end of which is connected to a refrigerant discharge pipe 109 of the compressor 102.
The low pressure gas pipe 112 connected to the second refrigerant suction pipe 111 and the switching valves 113a-d, 114a-b, 115, respectively.
A liquid pipe 117 connected to the other ends of the heat source side heat exchangers 103a and 103b while being branched and connected via a to b and 116a to b.
The main-use heat exchanger 104 and the sub-use-side heat exchangers 107, 1
The refrigerant decompressors 118a to 118c are provided on the branched liquid pipes 117a to 117c, respectively.

In the case of cooling the perimeter zone and the interior zone at the same time in the above structure, one of the switching valves 113a and 1 of the heat source side heat exchangers 103a and 103b, respectively.
13c is opened, the other switching valves 113b and 113d are closed, one switching valves 114a, 115a and 116a of the main and auxiliary heat exchangers 104, 107 and 108 are closed, and the other switching valves 114b, 115b and 116b are opened. The refrigerant discharged from the compressor 102 is discharged by the discharge pipe 10
9, switching valves 113a and 113c, heat source side heat exchanger 103
Flowing in the order of a and b, and after being condensed and liquefied here, they are distributed to each of the refrigerant decompressors 118a to 118c through the liquid pipe 117, and decompressed here. And the heat exchangers 104 and 10 on the main and sub-use sides
After evaporating at 7, 108, the switching valves 114b, 115
b, 116b are sucked into the compressor 102 through the low pressure gas pipe 112 and the suction pipe 111 in order. Thus, as the evaporator, the main use side heat exchanger 104 cools the perimeter zone and the sub use side heat exchangers 107 and 108 simultaneously cool the interior zone.

Next, when the perimeter zone is heated and the interior zone is cooled in the winter season, the switching valves 113b and 1b of the heat source side heat exchangers 103a and 103b, respectively.
13d is opened, the other switching valves 113a and 113c are closed, one switching valves 114a, 115a and 116a of the main and auxiliary heat exchangers 104, 107 and 108 are opened, and the other switching valves 114b, 115b and 116b are closed. The refrigerant discharged from the compressor 102 is discharged by the discharge pipe 10
9, the switching valves 114a, 115a, 116a, the main-use side heat exchanger 104, and the sub-use side heat exchangers 107, 108 in order, and after condensing and liquefying, each refrigerant decompressor 118a-.
The pressure is reduced at c. After passing through the liquid pipe 117 and evaporating in the heat source side heat exchangers 103a and 103b, the changeover valves 113b and 1b
13d, the low-pressure gas pipe 112, and the suction pipe 111 are sequentially sucked into the compressor 102. In this way, the main-use side heat exchanger 104 heats the perimeter zone, and the sub-use side heat exchangers 107 and 108 cool the interior zone.

[0007]

In such a conventional air conditioner, many switching valves are required to realize many operating conditions. Also, three pipes, a high pressure gas pipe, a low pressure gas pipe and a liquid pipe, are required from the main unit in the perimeter to the sub unit in the interior zone. Therefore, there is a problem that the structure becomes complicated and the complexity increases in construction.

The present invention solves the above-mentioned problems, and does not use a plurality of switching valves, and the main unit on the perimeter side to the sub-unit of the interior zone has two pipes similar to the conventional pipes, and the structure is simple. It is an object of the present invention to provide an air conditioner that can be simplified and simplified in construction.

[0009]

In order to achieve the above object, the present invention is directed to a compressor, a four-way valve, an outdoor heat exchanger, a main flow control device, first and second flow control devices, etc. A heat pump type air conditioner comprising an outdoor unit consisting of, a first indoor unit consisting of a first indoor heat exchanger and the like, and a second indoor unit consisting of a second indoor heat exchanger, A first branch pipe for branching the gas pipe into two in a pipe on the gas side connecting the first indoor unit and the outdoor unit in the outdoor unit, and one of the first branch pipes. Via the first switching valve,
The second branch pipe for connecting to the gas side pipe from the second indoor unit and the other of the first branch pipes are second pipes.
The third branch pipe for connecting to the suction pipe that connects the four-way valve and the suction portion of the compressor via the switching valve is provided.

[0010]

With the above-described structure, the present invention is particularly suitable for perimeter air conditioning of intelligent buildings and air conditioning of interior zones where internal load such as OA exhaust heat is high. By performing the combination of the control of the second flow rate control device and the opening and closing of the first and second switching valves, simultaneous operation of two units for cooling and heating, one unit operation for each, and the perimeter zone in winter It is possible to perform a mixed heating / cooling operation of heating and cooling of the interior zone.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, in the outdoor unit 1, a compressor 2, a four-way valve 3 for switching the flow paths of the refrigerant during cooling and heating, an outdoor heat exchanger 4, an outdoor heat exchanger 4 and outdoor air are provided. A blower (not shown) for heat exchange, a main flow controller such as an electronic expansion valve 5, a first flow controller such as an electronic expansion valve 6, and a second flow controller such as an electronic expansion valve 7 are provided. It is provided. The first indoor unit 8 includes a first indoor heat exchanger 9 and a blower (not shown) for exchanging heat between the indoor heat exchanger 9 and indoor air, and is connected to the outdoor unit 1 by a pipe. ing. Similarly, the second indoor unit 10 includes a second indoor heat exchanger 11 and a blower (not shown) for exchanging heat between the indoor heat exchanger 11 and the indoor air. It is connected. The gas side pipe 12 of the first indoor unit is provided with a first branch pipe 13 for bifurcating the gas side pipe 12 of the first indoor unit. A first switching valve, for example, a solenoid valve 14 is provided on one side of the first branch pipe 13, and is connected to the gas side pipe 15 of the second indoor unit via the first solenoid valve 14. A second branch pipe 16 is provided for this purpose. The pipe connected and joined by the second branch pipe 16 is connected to one end of the four-way valve 3. A second switching valve such as the solenoid valve 1 is provided on the other side of the first branch pipe.
7 is provided, and a third branch pipe 19 for connecting a suction pipe 18 through which the refrigerant is sucked from the four-way valve 3 to the compressor 2 via the second electromagnetic valve 17 is provided. ing.

A driving operation will be described with the above configuration. Now, it is assumed that the first indoor unit 8 air-conditions the interior zone and the second indoor unit 10 air-conditions the perimeter zone. First and second indoor units 8,
When 10 performs cooling at the same time, the four-way valve 3 is switched as shown by the solid line in FIG. 1, and the first solenoid valve 14 is opened and the second solenoid valve 17 is closed. The refrigerant gas that has become high temperature and high pressure by the compressor 2 passes from the discharge pipe 20 through the four-way valve 3 as shown by the solid line arrow, enters the outdoor heat exchanger 4, and exchanges heat with the outdoor air to be condensed and liquefied. After passing through the main electronic expansion valve 5, the condensed and liquefied refrigerant is branched into two by a branch pipe 21, one of which is controlled by a first electronic expansion valve 6 so as to control a predetermined refrigerant flow rate and at the same time decompressed to generate a first indoor heat. The inside of the room is cooled by entering the exchanger 9 and evaporating and evaporating. Similarly, the other of the two branched by the branch pipe 21 is depressurized at the same time by controlling the predetermined refrigerant flow rate by the second electronic expansion valve 7, enters the second indoor heat exchanger 11, and evaporates and vaporizes the interior of the room. To cool. The refrigerant evaporated and vaporized in the first indoor unit 8 is
It is returned to the outdoor unit 1 by the gas side pipe 12 of the first indoor unit, and is fed from the first branch pipe 13 to the first solenoid valve 14
While being returned via the second side unit, the gas side pipe 15 of the second indoor unit merges with the second branch pipe 16, enters one end of the four-way valve 3, is sucked into the compressor 2 through the suction pipe 18, and is connected to the perimeter. It is possible to cool the zone and the interior zone at the same time.

In order to perform the cooling operation of the first indoor unit 8 by one unit in the interior zone, the blower (not shown) of the second indoor unit 10 in the perimeter zone is stopped and the second electronic expansion valve is operated. 7 is controlled so that the refrigerant does not flow, and a predetermined refrigerant flow rate is controlled by adjusting the rotation speed of the compressor 2 and the opening degree of the first electronic expansion valve 6 to perform one cooling operation. it can. Similarly, the perimeter zone, that is, the cooling 1 of the second indoor unit 10
In order to perform the stand operation, the blower (not shown) of the first indoor unit 8 in the interior zone is stopped and the first indoor unit 8 is stopped.
The electronic expansion valve 6 is controlled so as to be closed so that the refrigerant does not flow, and a predetermined refrigerant flow rate is set to the rotation speed of the compressor 2 and the second refrigerant.
By controlling the opening degree of the electronic expansion valve 7, the single cooling operation can be performed.

The refrigerant from the first indoor unit is the first
The second indoor unit 1 is opened by opening the second solenoid valve 17 and opening the second branch valve 19 through the third branch pipe 19.
You may join with the refrigerant from 0.

Next, the driving operation during heating in winter will be described.
In order to perform the simultaneous heating operation of the interior and perimeter zones, first, the four-way valve 3 is switched during heating so that the refrigerant flows as shown by the broken line, and the first solenoid valve 14 is opened and the second solenoid valve 17 is opened. To close. The refrigerant discharged from the compressor 2 is discharged from the discharge pipe 20 as indicated by a broken arrow.
Then, after passing through the four-way valve 3, by the second branch pipe 16,
The refrigerant is split into the first indoor unit 8 and the second indoor unit 10, respectively. Refrigerant to the first indoor unit 8 is transferred from the first solenoid valve 14 and the first branch pipe 13 to the first
After passing through the gas side pipe 12 of the indoor unit, the first indoor heat exchanger 9 is condensed and liquefied to heat the interior zone. Similarly, the refrigerant to the second indoor unit passes through the third branch pipe 16 and the gas side pipe 15 of the second indoor unit to be condensed and liquefied in the second indoor heat exchanger 11 to heat the perimeter zone. .. The refrigerant condensed and liquefied in the first indoor unit 8 and the second indoor unit 10 passes through the first electronic expansion valve 6 and the second electronic expansion valve 7, respectively, and merges in the branch pipe 21, and then the main electronic expansion valve. The pressure is reduced by 5 and is evaporated and vaporized by the outdoor heat exchanger 4, and is sucked into the compressor 2 through the four-way valve 3 and the suction pipe 18 to heat two units simultaneously. When the heating load of the perimeter zone is larger than that of the interior zone, the second electronic expansion valve 7 is arranged so that a large amount of the refrigerant flows through the second indoor unit 10 of the perimeter zone while controlling the rotation speed of the compressor 2. May be controlled in the opening direction and in the closing direction of the first expansion valve 6.

In order to perform the heating operation only in the interior zone, the blower (not shown) of the second indoor unit is stopped from the above state, and the refrigerant is not accumulated in the pipe of the second electronic expansion valve 7. As described above, the second electronic expansion valve 7 may be controlled at the required minimum opening degree, and the rotation speed of the compressor 2 and the opening degree of the first electronic expansion valve 6 may be controlled according to the load in the interior zone. Further, in order to perform only the heating operation of the perimeter zone, the first solenoid valve 14 is closed from the state of the heating operation and the first electronic expansion valve 6 is controlled to the required minimum opening degree to cope with the load of the perimeter zone. And the number of revolutions of the compressor 2 and the second
The opening degree of the electronic expansion valve 7 may be controlled.

Next, the operation of the cooling / heating mixed operation of heating the perimeter zone and cooling the interior zone in the winter will be described. Most of the heating loads in recent intelligent buildings are external air loads, and the perimeter zone is heated, and the interior zone where OA exhaust heat is high is cooled by an air conditioning system. First, the four-way valve 3 is switched during heating so that the first solenoid valve 14 is closed and the second solenoid valve 17 is opened. The refrigerant discharged from the compressor 2 is the discharge pipe 2
0, after passing through the four-way valve 3, from the second branch pipe 16 to the second
The refrigerant flows to the second indoor unit 10 in the perimeter zone through the gas side pipe 15 of the indoor unit, and is condensed and liquefied in the second indoor heat exchanger 11 to perform heating.
After the condensed and liquefied refrigerant passes through the second electronic expansion valve 7,
The branch pipe 21 divides the flow into the outdoor heat exchanger 4 side and the first indoor unit 8 side in the interior zone. The refrigerant flowing to the outdoor heat exchanger 4 side is decompressed by the main electronic expansion valve 5, evaporated and vaporized by the outdoor heat exchanger 4, and then flows from the four-way valve 3 to the suction pipe 18. The refrigerant flowing to the first indoor unit 8 side is decompressed by the first electronic expansion valve 6 and evaporated and vaporized in the first indoor heat exchanger 9, thereby cooling the interior zone. The evaporated and evaporated refrigerant flows from the gas side pipe 12 of the first indoor unit to the first branch pipe 13 and the second solenoid valve 1.
7 and the third branch pipe 19 to join the suction pipe 18, and the refrigerant is sucked into the compressor 2 together with the refrigerant from the outdoor heat exchanger 4. In this way, by heating in the perimeter zone and cooling in the interior zone, it becomes possible to cope with intelligent buildings with uneven loads. Especially when the cooling load in the interior zone becomes high, the first electronic expansion valve 6 is opened in the direction in which the main electronic expansion valve 5 is tightened so that the flow rate of the refrigerant flows to the first indoor heat exchanger 9 more. By controlling the direction, the heating capacity of the perimeter zone is increased by increasing the amount of heat recovery in the interior zone, and the suction pressure of the compressor can be made higher than in normal heating, so the outside air temperature decreases. Even if the capacity is not lowered, the temperature and time for starting frost formation of the outdoor heat exchanger can be improved as compared with the conventional case.

As described above, according to the air conditioner of the embodiment of the present invention, the gas pipe is branched into two in the outdoor unit in the gas side pipe connecting the first indoor unit and the outdoor unit. And a second branch pipe for connecting one of the first branch pipes to the gas side pipe from the second indoor unit via the first electromagnetic valve, First
By providing the third branch pipe for connecting the other of the two branch pipes to the suction pipe connecting the four-way valve and the suction part of the compressor through the second solenoid valve, the cooling of the perimeter zone and the interior zone is achieved. In addition to the simultaneous operation of heating and heating, cooling of either the perimeter zone or interior zone, and operation of one heating unit, two electromagnetic heating and cooling operations that allow heating of the perimeter zone and cooling of the interior zone in winter It can be realized with a simple structure with only valves, and two pipes can be connected to the air conditioner in the interior zone, which simplifies workability.

Although two indoor units are shown for the outdoor unit in the embodiment, an outdoor unit and a perimeter zone such as a wall-through type air conditioner installed in a perimeter zone of a building, such as a wall-through air conditioner. The same effect can be obtained by integrating the first indoor unit that air-conditions and connecting only the second indoor unit that air-conditions the interior zone with two pipes.

[0021]

As is apparent from the above embodiments, according to the present invention, this gas pipe is branched into two in the outdoor unit in the gas side pipe connecting the first indoor unit and the outdoor unit. And a second branch pipe for connecting one of the first branch pipes to the gas side pipe from the second indoor unit via the first switching valve. , The third branch pipe for connecting the other of the first branch pipes to the suction pipe that connects the four-way valve and the suction portion of the compressor via the second switching valve, thereby providing the perimeter zone and the interior Simultaneous operation of cooling and heating of zones, and cooling and heating of either the perimeter zone or interior zone 1
In addition to being able to operate as a stand, mixed cooling and heating operation that can heat the perimeter zone and cool the interior zone in winter can be realized with a simple structure with only two switching valves, and as a pipe to the air conditioner in the interior zone. Since it is possible to use two connecting pipes, it is possible to provide an air conditioner which is effective in simplifying the structure and simplifying construction.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of a conventional air conditioner.

[Explanation of symbols]

 1 Outdoor Unit 2 Compressor 3 Four-way Valve 4 Outdoor Heat Exchanger 5 Main Flow Control Device (Main Electronic Expansion Valve) 6 First Flow Control Device (First Electronic Expansion Valve) 7 Second Flow Control Device (Second Electronic expansion valve) 8 first indoor unit 9 first indoor heat exchanger 10 second indoor unit 11 second indoor heat exchanger 12 gas side piping of first indoor unit 13 first branch pipe 14 1st switching valve (1st solenoid valve) 15 2nd indoor unit gas side piping 16 2nd branch pipe 17 2nd switching valve (2nd solenoid valve) 18 suction pipe 19 3rd branch pipe

Claims (1)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger, a main flow rate control device, an outdoor unit including first and second flow rate control devices, a first indoor heat exchanger, and the like. In a heat pump type air conditioner including a first indoor unit and a second indoor unit including a second indoor heat exchanger, the first indoor unit and the outdoor unit are provided in the outdoor unit. A first branch pipe for branching the gas pipe into two and one of the first branch pipes through a first switching valve in a gas side pipe connecting
The second branch pipe for connecting to the gas side pipe from the second indoor unit and the other of the first branch pipes are second pipes.
An air conditioner provided with a third branch pipe for connecting to the suction pipe connecting the four-way valve and the suction portion of the compressor via the switching valve.