JPH0480568A - Multi-chamber type air-conditioning machine - Google Patents

Abstract

PURPOSE:To realize simultaneous room cooling and room heating operations through a simple constitution by a method wherein an outdoor side expansion valve is connected to an indoor side heat exchanger through a first two-way vale, a four-way valve is connected to the indoor side heat exchanger through a second two-way valve while the outdoor side expansion valve is connected to the first two-way valve and the indoor side expansion valve through a two-way bypass valve. CONSTITUTION:An outdoor side expansion valve 6 is connected to indoor side heat exchangers 7a-7c through first two-way valves 13a-13c, a four-way valve 3 is connected to indoor side heat exchangers 7a-7c through second two-way valves 14a-14c and the outdoor side expansion valve 6 is connected to the first two-way valve and the indoor side expansion valves 16a-16c through a bypassing two-way valve 15. The four-way valve 3 is switched or the opening and/or closing or the opening degrees of the outdoor side expansion valve 6, the indoor side expansion valves 6a-6c, the first two-way valves 13a-13c, the second two-way valves 14a-14c and the bypassing two-way valve 15 are controlled in accordance with the operating mode of an outdoor machine 1 whereby room cooling or room heating can be set individually and freely in respective indoor machines 9a-9c and, therefore, the simultaneous operations of room cooling and room heating can be realized.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a multi-room air conditioner that uses air as a heat source, and is equipped with refrigeration cycle control for simultaneously performing cooling operation and heating operation for each room. This invention relates to a multi-room air conditioner.

BACKGROUND OF THE INVENTION Various detailed proposals have already been made regarding conventional multi-room air conditioners for performing cooling and heating operations at the same time. There is a multi-room air conditioner. To describe the basic technology, as shown in FIG. 4, a compressor 2. Four-way valve 3. Outdoor heat exchanger4. Outdoor blower 5. An outdoor expansion valve 6 is installed, and three indoor units 9 each consisting of an indoor heat exchanger 7a+ 7b+ 7c and an indoor fan 8a+ 8bt 8c are installed in parallel to the outdoor unit 1.
a, 9b, and 9c are connected via a refrigerant branch unit 10. Inside this refrigerant branch unit 10 is an indoor unit 9a.
, 9b, 9c, the first expansion valve 11a=llb
, llc, 2nd J11 tension valve 12a.

12 b, 12 c, first two-way valve 13a, 13bt
13 c is installed with second two-way valves 14 a, 14 b, and 14 c, and the outdoor expansion valve 6 and the first two-way valve 13
a, 13 b, 13 c and the first expansion valve 11
,,llb,lie and second expansion valves 12a, 12b, 1
A two-way bypass valve 15 is installed between the valve and the valve 2c.

The compressor 2 has a variable capacity, and the refrigerant flow rate, that is, the capacity, can be changed by changing the operating frequency using an inverter or the like. In addition, the four-way valve 3 allows cooling operation of the outdoor unit 1.
Alternatively, heating operation is switched, and during cooling operation, the refrigerant flows in the direction of the solid line arrow in the figure to form a cooling cycle, and during heating operation, the refrigerant flows in the direction of the broken line in the figure to form a heating cycle.

In such a multi-room air conditioner, the capacity of the compressor 2 is controlled by two-way valves 13a, 13b, and 13c.

14a, 14b, 14c, first expansion valve 11a, 11bt
By switching control of the LLC second expansion valves 12a, 12b, 12C and the outdoor expansion valve 6, the three indoor units 9a
It is possible to set cooling/heating operation for each of t9b and t9c individually.

Problems to be Solved by the Invention However, in the conventional example described above, it is necessary to install two indoor expansion valves for each indoor unit, which increases manufacturing costs and requires separate refrigerant branching from the indoor units. Since it requires a unit, installation space must be secured, and it has the disadvantage of poor construction efficiency.

Therefore, in view of the above problems, the present invention aims to realize simultaneous cooling and heating operation with a simpler configuration.

Means for Solving the Problems Technical means of the present invention for solving the above problems include a compressor, a west valve, an outdoor heat exchanger, and an outdoor blower.

An outdoor unit consisting of an outdoor expansion valve, and a plurality of indoor units each consisting of an indoor heat exchanger, an indoor blower, an indoor expansion valve, a first two-way valve, and a second two-way valve are connected in parallel. forming a refrigeration cycle, connecting the outdoor expansion valve and the indoor heat exchanger via the first two-way valve, and connecting the four-way valve and the indoor heat exchanger to the second The two-way valves are connected to each other, and the outdoor expansion valve and the first two-way valve are connected to each of the indoor expansion valves through a bypass two-way valve. be.

For production The effect of this technical means is as follows.

First, the cooling and heating operation capacities of each indoor unit are compared, and the operation mode of the outdoor unit is determined.

In other words, if (total cooling capacity of the indoor unit) ≧ (total heating capacity of the indoor unit), the outdoor unit will enter cooling operation mode, and if (total cooling capacity of the indoor unit) < (total heating capacity of the indoor unit), the outdoor unit will switch to cooling operation mode. is set to heating operation mode. Each operation mode of the outdoor unit will be explained below. However, when the four-way valve is ON, the refrigerant flows from the compressor discharge side to the outdoor heat exchanger, and from the indoor heat exchanger to the compressor. When the refrigerant is OFF, the refrigerant flows from the compressor discharge side to the indoor heat exchanger, and from the outdoor heat exchanger to the compressor suction side.

<In the case of outdoor unit: cooling operation mode> Fully open the outdoor expansion valve, open the first two-way valve of the indoor unit in heating mode, close the second two-way valve, fully open the indoor expansion valve, and turn on the indoor unit in cooling mode. Close the first three-way valve of the indoor unit.

The second two-way valve is opened, the indoor expansion valve is set to a predetermined opening degree, and the bypass two-way valve is closed. At this time, the high-temperature, high-pressure refrigerant sent from the outdoor heat exchanger passes through the first two-way valve of the indoor unit in heating mode, flows into the indoor heat exchanger, and radiates heat into the room to perform heating operation. After that, the refrigerant passes through the indoor expansion valve of the indoor unit in heating mode, is depressurized by the expansion valve of the indoor unit in cooling mode, and becomes a liquid or two-phase state.The refrigerant absorbs heat from the room in the indoor heat exchanger and cools the room. After operation, it returns to the outdoor unit via the second two-way valve.

However, if the indoor unit is in all-room cooling mode, open the bypass two-way valve, close all first two-way valves, open all second two-way valves, and close all indoor expansion valves to the specified setting. As for the degree of opening, the high-pressure liquid refrigerant sent from the outdoor unit is depressurized by the indoor expansion valve and becomes a liquid or two-phase state, and after absorbing heat from the room in the indoor heat exchanger to perform cooling operation, the high-pressure liquid refrigerant is transferred to the second two-phase Returns to the outdoor unit via the valve.

Outdoor unit: In heating operation mode> Open the outdoor expansion valve to the specified opening and open the first
Close the two-way valve, open the second two-way valve, fully open the indoor expansion valve, open the first two-way valve of the indoor unit in cooling mode, close the second two-way valve, and set the indoor expansion valve to the specified setting. The two-way bypass valve is closed.

At this time, the high-temperature, high-pressure refrigerant sent from the outdoor heat exchanger passes through the second two-way valve of the indoor unit in heating mode, flows into the indoor heat exchanger, radiates heat into the room, and performs heating operation. after that,
The refrigerant passes through the indoor expansion valve and is reduced in pressure by the indoor expansion valve in cooling mode to become a liquid or two-phase state.The refrigerant absorbs heat from the room in the indoor heat exchanger to perform cooling operation, and then is transferred to the first and second stages. Returns to the outdoor unit via the side valve.

However, when the indoor unit is in all-room heating mode, open the two-way bypass valve, close all first two-way valves, open all second two-way valves, and fully open all indoor expansion valves. The high-pressure gas refrigerant sent from the outdoor unit is sent to the indoor heat exchanger via the second two-way valve, and after radiating heat into the room and performing heating operation,
Indoor expansion valve.

Returns to the outdoor unit via a two-way bypass valve.

As described above, by controlling the indoor expansion valve, first two-way valve, second two-way valve, and bypass two-way valve of each indoor unit, simultaneous cooling and heating operation can be achieved. become.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings, and the same components as those in the conventional art will be denoted by the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a refrigeration cycle diagram of a multi-room air conditioner according to an embodiment of the present invention. The multi-room air conditioner of this embodiment has a compressor 2. Four-way valve 3. Outdoor heat exchanger4. Outdoor side blower 5
．． An outdoor unit 1 consisting of an outdoor expansion valve 6, indoor heat exchangers 7a, 7b, and 7C1, and indoor blowers 8al and 8bl, respectively.
8CI indoor expansion valves 16a, 16b, 16c, first two-way valve 13a.

13b, 13c, indoor units 9a, 9b, 9c consisting of second two-way valves 14a, 14b, 14C, and two-way bypass valve 1
5, and eight indoor units 9a, 9b, 9
c is connected in parallel to the outdoor unit 1 to form a refrigeration cycle.

In addition, the outdoor expansion valve 6 and the indoor heat exchanger 7a + 7b
, 7c are connected via the first two-way valves 13a, 13b, 13c, respectively, and the four-way valve 3 and the indoor heat exchangers 7a, 7b
, 7c each as a second two-way valve 14a.

14b, 14C, and for bypass between the outdoor expansion valve 6 and the first two-way valves 13a, 13b, 13C, and between the indoor expansion valves 16a, 16b, 16c. They are connected via a two-way valve 15.

However, when the four-way valve 3 is turned on, the refrigerant flows to the compressor 2.
From the discharge side to the outdoor heat exchanger 4, indoor units 9a, 9b, 9
c side to the compressor 2 suction side, and in the case of OFF, the refrigerant flows from the compressor 2 discharge side to the indoor units 9a, 9b, 9c side, and from the outdoor heat exchanger 4 to the compressor 2 suction side. do.

As shown in the block diagram of the control system in FIG. 2, remote controllers 18a and 18b are provided for each of the indoor units 9a, 9b, and 9e.

The signal from 18c is sent to A/D converter 19. CPU20,D
/A converter 21 etc. is input to the control device 17,
As a result of the necessary calculations, the pressure signal is sent to the four-way valve 3. Each expansion valve 6,
16a, 16b, 16c, each two-way valve 13a, 13b, 1
3c, 14a, 14bj14c, each bypass valve 15. The air is output to each blower 5° 8a, 8b, and 8c.

Next, the operation of the configuration of the embodiment will be explained.

FIG. 3 is a flowchart illustrating the control operation of this embodiment. First, in step 1, each indoor unit 9a, 9b
, 9c, the capacities of the cooling and heating operations are compared in step 2, and the operation mode of the outdoor unit 1 is determined in step 3. In other words, (total cooling capacity of indoor units 9a, 9b, 9c)≧(indoor unit 9
(total heating capacity of indoor units 9a, 9b, 9c), outdoor unit 1 is in cooling operation mode, (total heating capacity of indoor units 9a, 9b, 9c) The machine is set by the control device 17 to heating operation mode. Further, during heating operation, if defrosting operation of the outdoor heat exchanger 4 is required, the heating & defrosting operation mode is set. Then, depending on the operation mode of the outdoor unit 1, the four-way valve 3 is switched, the outdoor expansion valve 6°, the indoor expansion valve 16a, 16b, 16c, the first
Two-way valves 13a, 13b, 13c, second two-way valve 14a.

By controlling the opening/closing or opening degree of the bypass two-way valves 14b, 14c, and 15, the following operation is performed.

The table below shows the two-way valves 13a, 1 in each case in this embodiment.
3b, 13c, 14a, 14kl+14c, expansion valve 6,
16a, 16b, 16c.

And, it is a table of the opening and closing states of the bypass valve 15. This will be explained below with reference to the table below.

(Margin below) Outdoor unit: In case of cooling operation mode> For example, indoor unit 9a is in heating mode and indoor unit 9b is in heating mode.

A case where 9c is in the cooling mode will be explained.

Fully open the outdoor expansion valve 6 and open the first indoor unit 9a in heating mode.
Open the two-way valve 13a, close the second two-way valve 14a, fully open the indoor expansion valve 16a, close the first two-way valves 13b and 13c of the indoor units 9b and 9c in cooling mode, and close the second two-way valve. 14b, 1
4c is opened, the indoor expansion valves 16b and 16c are set to a predetermined opening degree, and the two-way bypass valve 15 is closed. At this time, the high-temperature, high-pressure refrigerant sent from the outdoor heat exchanger 4 passes through the first two-way valve 13at of the indoor unit 9a in heating mode, flows into the indoor heat exchanger 7a, radiates heat indoors, and performs heating operation. After that, the indoor unit 9b is placed in the heating mode.

The refrigerant passes through the indoor expansion valves 16b and 16c of the indoor units 9b and 9c in the cooling mode, and is reduced in pressure to a liquid or two-phase state by the expansion valves 16b and 16C of the indoor units 9b and 9c in the cooling mode, and is then transferred to the indoor heat exchangers 7b and 7c. After absorbing heat from the room and performing cooling operation, it returns to the outdoor unit 1 via the second two-way valves 14b and 14C.

However, when the indoor unit 1 is in the all room cooling mode, the bypass two-way valve 15 is opened and all the first two-way valves 13 a, 13 are closed.
b, 13c closed, all second two-way valves 14a, 1
4b, 14c and all indoor expansion valves 16a, 16
b, 16c are set to predetermined opening degrees, and the high-pressure liquid refrigerant sent from the outdoor unit 1 is passed through the two-way bypass valve 15 to the indoor expansion valves 16a, 16b.

16c, the pressure is reduced to a liquid or two-phase state, and after the indoor heat exchangers 7a, 7b, 7c absorb heat from the room and perform cooling operation, it is transferred to the outdoor unit via the second two-way valves 14a, 14b, 14c. Return to 1.

<Outdoor unit: In heating operation mode> For example, the indoor unit 9a is in the cooling mode and the indoor unit 9b is in the cooling mode.

The case where 9c is the heating mode will be explained.

The outdoor expansion valve 6 is opened to a predetermined degree, and the indoor unit 9b is in heating mode.
, 9c, the first two-way valves 13b and 13c are closed.

Open the second two-way valves 14b and 14c, and open the indoor expansion valve 16b.
16c is fully opened, the first two-way valve 13a of the indoor unit 9a in cooling mode is opened, the second two-way valve 14a is closed, and the indoor expansion valve 1 is opened.
6a to a predetermined opening degree, and furthermore, a two-way bypass valve 15
is closed. At this time, the high-temperature and high-pressure refrigerant sent from the outdoor heat exchanger 4 passes through the second two-way valves 14b and 14c of the indoor units 9b and 9c in the heating mode, and passes through the indoor heat exchangers 7b and 7c.
The heat flows into the room, radiates heat into the room, and performs heating operation. After that, the refrigerant passes through the indoor expansion valves 16b and 16c and is reduced in pressure by the indoor expansion valve 16a in the cooling mode to become a liquid or two-phase state.The refrigerant absorbs heat from the room in the indoor heat exchanger 7a and performs cooling operation. After that, it returns to the outdoor unit 1 via the first two-way valve 13a.

However, when the indoor unit 1 is in the all-room heating mode, the two-way bypass valve 15 is opened and all the first two-way valves 13 a, 13 are opened.
b, 13c closed, all second two-way valves 14a, 1
4b, 14c and all indoor expansion valves 16a, 16
b, 16c are fully opened, the high pressure gas refrigerant sent from the outdoor unit 1 is sent to the indoor heat exchangers 7a + 7b, 7c via the second two-way valves 14a, 14b, 14c, and radiates heat into the room for heating. After operation, the indoor expansion valves 16a, 16
b, 16c.

It returns to the outdoor unit 1 via the two-way bypass valve 15.

As described above, the indoor expansion valves 16a, 16b, 16c are installed in the indoor units 9a, 9b, 9c, respectively.

First two-way valve 13a, 13.13c, second two-way valve 14a,
By controlling 14b, 14c and the two-way bypass valve 15, it is possible to realize simultaneous cooling and heating operations.

As mentioned above, compressor 2. Four-way valve 3. Outdoor heat exchanger 4
．． Outdoor blower 5. Outdoor unit 1 consisting of an outdoor expansion valve 6
and indoor heat exchangers 7a, 7b, 7c, indoor blowers 8a, 8b+ 80. Indoor expansion valve 16a, 1
6b, 16c, first two-way valve 13a, 13, 13c, second
Two-way valve 14a+I4b.

In a multi-room air conditioner equipped with a plurality of indoor units 9a, 9b, 9c consisting of 14c and a two-way bypass valve 15,
A plurality of indoor units 9a, 9b, 9c are connected in parallel to the outdoor unit 1 to form a refrigeration cycle, and the outdoor expansion valve 6 and the indoor heat exchanger are connected in parallel to each other. a+ 7b17c each to the first two-way valve 13
a, 13.13 c are connected through each, and are connected to the four-way valve 3 and the indoor heat exchanger 7a.

7b and 7c are connected through each of the second two-way valves 14a, 14b, and 14c, and between the outdoor expansion valve 6 and the first two-way valves 13a and 13.13c and the indoor expansion valve. 16
a, 16b, and 16c between each of the two-way valve 15 for bypass.
The four-way valve 3 can be switched depending on the operation mode of the outdoor unit 1, and the outdoor expansion valve 6. Indoor expansion valve 1
6a, 16b.

16C1 By controlling the opening/closing or opening degree of the first two-way valves 13a, 13, 13c, the second two-way valves 14a+14b, 14c, and the two-way bypass valve 15, each indoor unit 9a*9 In b-9c, cooling and heating can be freely set individually, and simultaneous operation of cooling and heating can also be realized. In addition, indoor unit 9a +9b
, 9c, the equipment configuration is simple. Therefore, when installing the equipment, it requires almost the same space as conventional equipment, and the workability is also good.

Effects of the Invention As described above, the present invention provides an outdoor unit comprising a compressor, a four-way valve, an outdoor heat exchanger, an outdoor blower, and an outdoor expansion valve;
A multi-room air conditioning system in which a refrigeration cycle is formed by connecting multiple indoor units in parallel, each consisting of an indoor heat exchanger, an indoor blower, an indoor expansion valve, a first two-way valve, and a second two-way valve. , the outdoor expansion valve and the indoor heat exchanger are connected via the first two-way valve, and the four-way valve and the indoor heat exchanger are connected via the second
connected via each two-way valve, and connected to the outdoor expansion valve and the first
The two-way valve and the indoor expansion valve are connected via a two-way bypass valve, and the four-way valve can be switched depending on the operation mode of the outdoor unit, and the outdoor expansion valve and the indoor expansion valve can be connected to each other. , a first two-way valve, and a second two-way valve.

By controlling the opening/closing or the degree of opening of the two-way bypass valve, cooling and heating can be freely set individually in each indoor unit, and cooling and heating can be operated simultaneously. In addition, since the necessary parts are built into the indoor unit,
The equipment configuration is simple, so when installing the equipment, it requires almost the same space as conventional equipment and is easy to install.

[Brief explanation of drawings]

FIG. 1 is a diagram of a refrigeration system for a multi-room air conditioner according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control system of the embodiment.
FIG. 3 is a flowchart explaining the control operation of the embodiment;
FIG. 4 is a diagram of a refrigeration system of a multi-room air conditioner showing a conventional example. 1... Outdoor unit, 2... Compressor, 3... Four-way valve, 4
・・Outdoor heat exchanger, 5...Outdoor blower, 6...
・Outdoor expansion valve, 7a+ 7bt 7C... Indoor heat exchanger, 8a, 8b, 8c ・Indoor blower, 9a, 9b
, 9c... Indoor unit, 13a, 13b, 13e... First two-way valve, 14a, 14b, 14c... Second two-way valve,
15...Two-way valve for bypass valve, 16a, 16b, 16C
...Indoor expansion valve. Agent's name Patent attorney Shigetaka Awano Haka 1 person 1 "Tatosugi table compression four-way valve! Outer V-￥dust each outdoor membrane 1 Slip machine 8α, B6.8c qa, 9b, '?c Chamber r1: J Atsushizu of the interior decoration of the side-running lice

Claims (1)

[Claims] An outdoor unit consisting of a compressor, a four-way valve, an outdoor heat exchanger, an outdoor blower, and an outdoor expansion valve; A refrigeration cycle is formed by connecting a plurality of indoor units consisting of a first two-way valve and a second two-way valve in parallel, and each of the outdoor expansion valve and the indoor heat exchanger is connected to the first
connected via respective two-way valves, the four-way valve and each of the indoor heat exchangers are connected via each of the second two-way valves, and the outdoor expansion valve and the first two-way valve A multi-room air conditioner, characterized in that the air conditioner and each of the indoor expansion valves are connected via a two-way bypass valve.