JPS63279063A - Simultaneous air-conditioning method at plurality of position - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention provides a heat pump type heat source unit that includes:
The present invention relates to a simultaneous air conditioning method for multiple locations in which a plurality of air conditioning units are connected and each air conditioning unit can perform heating and cooling separately.

(Prior art) Conventionally, various air-conditioning and heating systems have been provided in which a single heat pump type heat source unit is connected to multiple air conditioning units through two pipes, a gas pipe and a liquid pipe, and the refrigerant is directly used. This system is designed to control the temperature of each air conditioning unit and perform all heating or cooling.

(Problems to be solved by the invention) <Problems with the conventional technology> However, as buildings have become larger, the load characteristics between the interior and a portion of the verimeter are often significantly different. .

Therefore, in the above air conditioning system, it is possible to control the temperature of each air conditioning unit, but as mentioned above, all air conditioning units operate only for full heating or full cooling at certain times, so cooling is not necessary. Problems have arisen in that heating is performed in certain areas, or conversely, cooling is performed in areas that require heating.

In view of the above-mentioned problems, the present invention has been developed to connect multiple air conditioning units to one heat pump type heat source unit so that each air conditioning unit can perform heating and cooling separately. It was created with the aim of being able to adequately cope with large buildings, etc., even if the load characteristics between the interior and a portion of the verimeter are significantly different.

[Structure of the Invention] (Means for Solving the Problems) This invention consists of a plurality of air conditioning units each including an indoor heat exchanger, an indoor blower, etc., and a compressor, an outside air heat exchanger, an outside air blower, etc. In a simultaneous air conditioning method for multiple locations in which indoor air conditioning is performed using one heat pump type heat source unit, each air conditioning unit is equipped with the first opening of a three-way valve at one end of the indoor heat exchanger pipe. Alternatively, the pipes are branched into two systems and each pipe is connected with an on-off valve, and the other end of the pipe is connected to a regulating pipe line, and this regulating pipe line connects the first pipe system and the first pipe system. The first pipe system opens when the pressure inside the indoor heat exchanger of the air conditioning unit becomes higher than the pressure on the opposite side of the first pipe system with respect to this heat exchanger. A check valve and a heating opening/closing valve are provided in order to release the condensed liquid refrigerant in that direction, and the second pipe system is provided with a check valve and a heating on/off valve to release the condensed liquid refrigerant in that direction. A check valve and a cooling on/off valve are respectively provided in order to open when the pressure becomes lower than the pressure on the opposite side of the second pipe system and draw the refrigerant into the indoor heat exchanger through the throttle pipe section. The unit includes a high-pressure gas pipe that connects the compressor discharge pipe and the outside air heat exchanger to send gaseous refrigerant, and a high-pressure gas pipe that connects the outside air heat exchanger and the compressor suction pipe to send the gaseous refrigerant. A low-pressure gas pipe to send liquid refrigerant and a liquid pipe to send liquid refrigerant directly from the outside air heat exchanger to each air conditioning unit are provided, and a regulating piping path is interposed between the liquid pipe and the outside air heat exchanger. The line branches into a third pipe system and a fourth pipe system, and the third pipe system opens when the pressure in the outside air heat exchanger becomes higher than the pressure in the liquid pipe to carry the condensed liquid refrigerant. A check valve is provided in the fourth pipe system to release water from the outside air heat exchanger to the liquid pipes, and when the pressure inside the outside air heat exchanger becomes lower than the pressure in the liquid pipes, the pressure is discharged from the liquid pipes through the throttle pipe section. A check valve is provided to suck in the liquid refrigerant, the high pressure gas pipe and the low pressure gas pipe are merged and connected to the outside air heat exchanger, and
An on-off valve is provided between the outside air heat exchanger and the compressor, and a valve is branched from between the on-off valve and the compressor.
The high-pressure gas pipe is connected to the second opening of a three-way valve connected to one end of the pipe line of the indoor heat exchanger, or to one of the pipes branching into two systems, and the low-pressure gas pipe is connected to one end of the pipe line of the indoor heat exchanger, and the low-pressure gas pipe is connected to the second opening of the three-way valve connected to one end of the pipe line of the indoor heat exchanger. and connected to the third opening of a three-way valve connected to one end of the pipe line of the indoor heat exchanger, or to the other side of the pipe branching into two systems,
The liquid pipe is connected to both the discharge port of the first pipe system and the suction port of the second pipe system in the regulating pipe line connected to the air conditioning unit l, and the lower limit pressure of the high pressure gas pipe and the upper limit pressure of the low pressure gas pipe are connected together. Pressure is adjusted by automatically adjusting the compressor to make the former higher and the latter lower based on a constant pressure value, and if the pressure in the high pressure gas pipe exceeds the upper limit pressure value, a The on-off valve of the heat source unit is opened, and when the pressure of the low-pressure gas pipe falls below the lower limit pressure value, the on-off valve of the heat source unit provided on the low-pressure gas pipe is opened, and each air conditioning unit is set to open when heating is required. , connect the first opening and the second opening of the three-way valve, or open one of the on-off valves of the pipe that branches into two systems, and open and close the heating on-off valve, and when cooling is required, the three-way valve opens and closes. The first opening and the third opening of the directional valve are communicated with each other, or the other on-off valve of the pipe that branches into two systems is opened, and the cooling on-off valve is opened and closed, and these are
The above-mentioned problems are solved by appropriately controlling each air conditioning unit depending on the temperature at the location where it is installed indoors.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

That is, the reference numeral 1 shown in the figure is an air conditioning unit, which includes an indoor heat exchanger 2, an indoor blower 3, and the like.

On the other hand, reference numeral 11 shown in the figure is a heat pump type heat source unit, which includes an outside air heat exchanger 12, an outside air blower 13, a compressor 14, and the like.

A plurality of air conditioning units 1 are connected to one heat pump type heat source unit 11 to perform indoor air conditioning at a plurality of locations simultaneously.

In each air conditioning unit 1, a first opening 22 of a three-way valve 21 is connected to one end of a pipe line of an indoor heat exchanger 2, and a regulating pipe line 31 is connected to the other end of the pipe line.

This adjustment piping line 31 includes a first piping system 32 and a second piping system 3.
The pressure inside the indoor heat exchanger 2 of the air conditioning unit 1 is divided into the first pipe system 32 and the first pipe system 32.
A check valve 34 and a heating on/off valve 35 are connected in series so as to open when the pressure on the opposite side of the pipe system 32 becomes higher and release the condensed liquid refrigerant in that direction. The second pipe system 33 is opened to form a throttle pipe section 36 when the pressure inside the indoor heat exchanger 2 becomes lower than the pressure on the opposite side of the second pipe system 33 with respect to the heat exchanger 2. A throttle pipe section 36, a check valve 37, and a cooling on/off valve 38 are connected in series to draw the refrigerant into the indoor heat exchanger 2 through the air conditioner.

On the other hand, the heat source unit 11 includes a discharge pipe 15 of the compressor 14.
A high-pressure gas pipe 4 connects the outside air heat exchanger 12 and sends the gaseous refrigerant, and a low-pressure gas pipe 4 connects the outside air heat exchanger 12 and the suction pipe 16 of the compressor 14 and sends the gaseous refrigerant. and,
A liquid pipe 6 for directly sending liquid refrigerant to each air conditioning unit 1 from the outside air heat exchanger 12 is provided.

A regulating piping path 4 is provided between the liquid pipe 6 and the outside air heat exchanger 12.
1 to intervene.

This adjustment piping line 41 is connected to a third piping system 42 and a fourth piping system 4.
When the pressure inside the outside air heat exchanger 12 becomes higher than the pressure in the liquid pipe 6, the third pipe line system 42 opens to transfer the condensed liquid refrigerant from the outside air heat exchanger 12 to the liquid pipe. A check valve 44 is provided in the fourth pipe system 43 to release water from the liquid pipe 6 through a throttle pipe section 45 when the pressure in the outside air heat exchanger 12 becomes lower than the pressure in the liquid pipe 6. A check valve 46 and a throttle pipe section 45 are connected in series to each other in order to suck liquid refrigerant through the throttle pipe section 45 .

I On the other hand, the high pressure gas pipe 4 and the low pressure gas pipe 5 merge and are connected to the outside air heat exchanger 12, and on-off valves 7.8 are provided between the outside air heat exchanger 12 and the compressor 14, respectively.

The high pressure gas pipe 4 and the low pressure gas pipe 5 are branched from between the on-off valves 7 and 8 and the compressor 14, respectively, and the high pressure gas pipe 4 is connected to one end of the pipe line of the indoor heat exchanger 2. The low pressure gas pipe 5 is connected to the second opening 23 of the connected three-way valve 21.
The compressor 14 is branched off and connected to the third opening 24 of the three-way valve 21 .

The liquid pipe 6 also has an outlet of the first pipe system 32 and an inlet of the second pipe system 33 in the regulating pipe line 31 connected to the air conditioning unit 1, that is, the regulating pipe line 31 and the first pipe line 31. Pipe system 3
2 and the opposite side ports of the indoor heat exchanger 2 are connected together.

On the other hand, the lower limit pressure of the high pressure gas pipe 4 and the upper limit pressure of the low pressure gas pipe 5 are adjusted by automatically adjusting the compressor 14 to make the former higher and the latter lower, based on a constant pressure value. If the pressure in 4 exceeds the upper limit pressure value, high pressure gas pipe 4
The on-off valve 7 of the heat source unit 11 provided in the low pressure gas pipe 5 is opened, and the on-off valve 8 of the heat source unit 11 provided in the low pressure gas pipe 5 is opened when the pressure of the low pressure gas pipe 5 falls below a lower limit pressure value. has been done.

In each air conditioning unit 1, when heating is required, the first opening 22 and second opening 23 of the three-way valve 21 are communicated, and the heating on-off valve 35 is opened and closed, and when cooling is required, the three-way valve 21 is opened and closed. The first opening 22 and the third opening 23 of the directional valve 21
The cooling on-off valve 38 is opened and closed, and these are controlled for each air conditioning unit 1 as appropriate depending on the temperature of the installation location in the room.

The on-off valves 7 and 8, the three-way valve 21, the heating on-off valve 35, and the cooling on-off valve 38 described above are normally electromagnetic valves.

The actual operation will be described next. When performing heating with one air conditioning unit 1, as mentioned above, the three-way valve 21 is operated to communicate the first opening 22 and the second opening 23, and Open the heating on-off valve 35 of the first pipeline system 32.

Then, high-pressure refrigerant gas flows into the indoor heat exchanger 2 from the high-pressure gas pipe 4, and this gas is condensed there to perform heating. The condensed liquid refrigerant flows through the liquid pipe 6 to the heat source unit 11 via the check valve 34 .

In this air conditioning unit 1, when the room temperature rises and reaches a desired temperature, the heating on-off valve 35 is closed to adjust the temperature.

On the other hand, when the air conditioning unit 1 located at a different location from the air conditioning unit 1 performs cooling at the same time as the heating, the three-way valve 21 is operated to open the first opening 22 and the third opening 2.
4, and the cooling on-off valve 38 in the second pipe system 33 is opened.

Then, the liquid refrigerant passes through the check valve 37 from the liquid pipe 6, is sent into the indoor heat exchanger 2 via the throttle pipe section 36, and is evaporated to perform cooling. The evaporated refrigerant flows into the low pressure gas pipe 5 through the three-way valve 21 as a low pressure gas.

Similar to the heating described above, when the room temperature drops and reaches a desired temperature, the cooling on-off valve 38 is closed to adjust the temperature.

To do these simultaneously, the pressure in the high pressure gas pipe 4 and the low pressure gas pipe 5 is automatically adjusted by the compressor 14 so that the former is high and the latter is low.
A regulating piping line 41 disposed between the outside air heat exchanger 12 and the outside air heat exchanger 12 copes with the fluctuation and appropriately sends liquid refrigerant into the outside air heat exchanger 12 to open it and adjust it to maintain a constant level. The pressure difference causes high-pressure refrigerant gas to flow into the indoor heat exchanger 2 during heating, and liquid refrigerant during cooling into the three-way valve 21.
, the heating on-off valve 35, and the cooling on-off valve 38 to flow into the indoor heat exchanger 2.

Then, pressure fluctuations occur inside each of the high-pressure gas pipe 4, low-pressure gas pipe 5, and liquid pipe 6 due to cooling and heating performed separately by each air conditioning unit 1.
It is automatically adjusted by the on-off valve 7, the on-off valve 8, the compressor 14, and the regulating piping line 41, so that the total load at that time is heat exchanged by the outside air heat exchanger 12 of the heat source unit 11. .

In other words, in the conventional case, liquid refrigerant and gas refrigerant are sent.
The external heat source unit and the indoor air conditioning unit were connected using two pipes, but the pipe that sends the gas refrigerant was replaced with the high-pressure gas pipe 4.
and low pressure gas pipe 5 to obtain the pressure difference, operate the multiple valves, and use the pressure difference to allow the refrigerant to flow in the forward and reverse directions, thereby cooling each air conditioning unit 1. ,
Heating can be done separately.

As shown in FIG. 2, the structure of the regulating piping line 31 operated in this way is such that the first piping system 32 has only the check valve 34, and the second piping system 33 has the throttle pipe section 36 and the reverse valve. A stop valve 37 may be connected in series and an on-off valve 39 may be provided between the confluence of the first pipe system 32 and the second pipe system 33 and the liquid pipe 6. As shown in the figure, the first pipe system 32 has a structure in which only a heating on-off valve 35 is arranged, and the second pipe system 33 has a throttle pipe section 36 and a cooling on-off valve 38 connected in series. Even if there is one, it operates in the same way as the regulating piping line 31 in the embodiment described above.

Also, as shown in FIG. 4, instead of the three-way valve 21, the pipes are branched into two systems and on-off valves 27 and 28 are provided in each system.
The high pressure gas pipe 4 is connected to one of the pipes 25, and the other pipe 2
By connecting the low-pressure gas pipes 5 to 6 and opening and closing the on-off valve 27 and the on-off valve 28 as appropriate instead of the three-way valve 21, the same operation as the three-way valve 21 can be achieved. It goes without saying that any structure may be used as long as the valve or the regulating piping line 31 operates in the same manner as described above.

[Effects of the Invention] The present invention configured as described above includes a plurality of air conditioning units 1 including an indoor heat exchanger 2, an indoor blower 3, etc., a compressor 14, an outside air heat exchanger 12, an outside air blower 13, etc. consisting of
In a simultaneous air conditioning method for multiple locations in which indoor air conditioning is performed using one heat pump type heat source unit 11, each air conditioning unit 1 has a pipe at one end of the indoor heat exchanger 2.
The first opening 22 of the three-way valve 21 is connected to pipes 25 and 26 that are branched into two systems and provided with on-off valves 27 and 28, respectively, and a regulating pipe line 31 is connected to the other end of the pipe. This adjustment piping line 31 branches into a first piping system 32 and a second piping system 33, and the first piping system 32 has a pressure inside the indoor heat exchanger 2 of the air conditioning unit 1. When the pressure on the opposite side of the first pipe system 32 becomes higher than that on the opposite side of the heat exchanger 2, a check valve 34 opens to discharge the condensed liquid refrigerant in that direction.
and a heating on/off valve 35 are provided in the second pipe system 33 such that the pressure inside the indoor heat exchanger 2 is the pressure on the opposite side of the second pipe system 33 with respect to this heat exchanger 2. A check valve 37 and a cooling on/off valve 38 are respectively provided in order to open when the temperature becomes lower and draw the refrigerant into the indoor heat exchanger 2 through the throttle pipe section 36. A high-pressure gas pipe 4 connects the discharge pipe 15 of 14 and the outside air heat exchanger 12 and sends a gaseous refrigerant, and the outside air heat exchanger 12
A low-pressure gas pipe 5 is provided to connect the suction pipe 16 of the compressor 14 to send gaseous refrigerant, and a liquid pipe 6 is provided to send liquid refrigerant directly from the outside air heat exchanger 12 to each air conditioning unit 1. A regulating piping path 41 is interposed between the liquid pipe 6 and the outside air heat exchanger 12, and this regulating piping path 41 is arranged as follows. It branches into a J3 pipe system 42 and a fourth pipe system 43, and the third pipe system 42 opens when the pressure inside the outside air heat exchanger 12 becomes higher than the pressure in the liquid pipe 6, and contains the condensed liquid refrigerant. A check valve 44 is provided in order to release the heat from the outside air heat exchanger 12 to the liquid pipe 6, and the fourth pipe line system 43 is provided with a check valve 44 which is closed when the pressure inside the outside air heat exchanger 12 becomes lower than the pressure in the liquid pipe 6. A check valve 46 is provided to suck liquid refrigerant from the liquid pipe 6 through the pipe part 45, and the high pressure gas pipe 4 and the low pressure gas pipe 5 are joined and connected to the outside air heat exchanger 12, and
On-off valves 7 and 8 are provided between the outside air heat exchanger 12 and the compressor 14, respectively, and the high-pressure gas pipe 4 is branched from between the on-off valves 7 and 8 and the compressor 12, respectively. The second of the three-way valve 21 connected to one end of the pipe line of the internal heat exchanger 2
The low pressure gas pipe 5 was connected to the opening 23 or to one pipe 25 of the pipes branching into two systems, and the low pressure gas pipe 5 was branched from the compressor 14 and connected to one end of the pipe line of the indoor heat exchanger 2. A first pipe line in the regulating pipe line 31 connected to the air conditioning unit 1 is connected to the third opening 24 of the three-way valve 21 or the other pipe 26 of the pipes branching into two systems, and the liquid pipe 6 is connected to the third opening 24 of the three-way valve 21 or to the other pipe 26 of the pipes branching into two systems. The discharge port of the system 32 and the suction port of the second pipe system 33 are connected together, and the lower limit pressure of the high pressure gas pipe 4 and the upper limit pressure of the low pressure gas pipe 5 are set such that the former is higher than the latter with respect to a constant pressure value. The compressor 14 is automatically adjusted to lower the pressure, and when the pressure in the high-pressure gas pipe 4 exceeds the upper limit pressure value, the on-off valve 7 of the heat source unit 11 provided in the high-pressure gas pipe 4 is opened to reduce the low pressure. When the pressure of the gas pipe 5 drops below the lower limit pressure value, open the on-off valve 8 of the heat source unit 11 provided in the low pressure gas pipe 5,
In each air conditioning unit 1, when heating is required, the first opening 22 and the second opening 23 of the three-way valve 21 are connected, or
Alternatively, the on-off valve 27 provided in one of the pipes 25 branching into two systems is opened, and the heating on-off valve 3 is opened.
5, and when cooling is required, the first opening 22 and the third opening 24 of the three-way valve 21 are communicated, or the on-off valve 28 provided in the other pipe 26 of the pipes branching into two systems is opened and closed. At the same time, the cooling on-off valve 36 is opened and closed, and these are controlled for each air conditioning unit 1 as appropriate depending on the temperature of the installed location in the room, thereby operating as in the above-described embodiment.

That is, when performing heating with one air conditioning unit 1, as described above, the three-way valve 21 etc. are operated to connect the first opening 22 and the second opening 23, and the first pipe system 32 is operated. Open the heating on-off valve 35.

Then, high-pressure refrigerant gas flows into the indoor heat exchanger 2 from the high-pressure gas pipe line 4, and this gas is condensed there to perform heating. The condensed liquid refrigerant flows through the liquid pipe 6 to the heat source unit 11 via the check valve 34 .

In this air conditioning unit 1, when the room temperature rises and reaches a desired temperature, the heating on-off valve 35 is closed to adjust the temperature.

On the other hand, when the air conditioning unit 1 located at a different location from the air conditioning unit 1 performs cooling at the same time as the heating, the three-way valve 21 and the like are operated to open the first opening 22 and the third opening 24. At the same time, the cooling on-off valve 38 in the second pipe system 33 is opened.

Then, the liquid refrigerant passes through the check valve 37 from the liquid pipe 6, is sent into the indoor heat exchanger 2 via the throttle pipe section 36, and is evaporated to perform cooling. The evaporated refrigerant flows as a low-pressure gas to the low-pressure gas pipe 5 through the three-way valve 21 and the like.

Similar to the above-mentioned heating, when the room temperature decreases and reaches a desired temperature, the cooling on/off valve 38 is closed to adjust the temperature.

To do these simultaneously, the pressure in the high pressure gas pipe 4 and the low pressure gas pipe 5 is automatically adjusted by the compressor 14 so that the former is high and the latter is low.
A regulating piping line 41 disposed between the outside air heat exchanger 12 and the outside air heat exchanger 12 copes with the fluctuation and appropriately sends liquid refrigerant into the outside air heat exchanger 12 to open it and adjust it to maintain a constant level. The pressure difference causes high-pressure refrigerant gas to flow into the indoor heat exchanger 2 during heating, and liquid refrigerant during cooling into the three-way valve 21.
etc., is made to flow to the indoor heat exchanger 2 via the heating on-off valve 35 and the cooling on-off valve 38.

Then, pressure fluctuations occur inside each of the high-pressure gas pipe 4, low-pressure gas pipe 5, and liquid pipe 6 due to cooling and heating performed separately by each air conditioning unit 1.
It is automatically adjusted by the on-off valve 7, the on-off valve 8, the compressor 14, and the regulating piping line 41, so that the total load at that time is heat exchanged by the outside air heat exchanger 12 of the heat source unit 11. be.

In other words, in the conventional case, liquid refrigerant and gas refrigerant are sent.
The external heat source unit and the indoor air conditioning unit were connected using two pipes, but the pipe that sends the gas refrigerant was replaced with the high-pressure gas pipe 4.
By using two pipes, the low-pressure gas pipe 5, and the low-pressure gas pipe 5 to obtain the pressure difference, and operating a multi-valve to utilize the pressure difference to allow the refrigerant to flow in both forward and reverse directions, each air conditioning unit 1 can be cooled and
Heating can be done separately.

Therefore, when heating and cooling using one heat source unit 11 and multiple air conditioning units 1, it was completely impossible with the conventional heating and cooling system that connects with two pipes, a gas pipe and a liquid pipe, and uses refrigerant directly. Separate cooling and heating can be performed for each air conditioning unit 1, and since the structure is not complicated, it can be provided at low cost without increasing costs.

As explained above, according to the present invention, a plurality of air conditioning units are connected to one heat pump type heat source unit so that each air conditioning unit can perform heating and cooling separately. , even if the load characteristics between the inside and a part of the verimeter are significantly different, it can sufficiently cope with it, and has various excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram, and FIGS. 2 to 4 are schematic diagrams of other embodiments of an air conditioning unit and piping and valves connected thereto. 1... Air conditioning unit, 2... Indoor heat exchanger, 3...
・Indoor blower, 4... High pressure gas pipe, 5... Low pressure gas pipe, 6... Liquid pipe, 7... On-off valve, 8... On-off valve,
11...Heat source unit, 12...Outside air heat exchanger, 1
3... Outside air blower, 14... Compressor, 15... Discharge pipe, 16... Suction pipe, 21... Three-way valve, 22... First opening, 23...
Second opening, 24...Third opening, 25...Pipe, 26...
... Pipe, 27... Opening/closing valve, 28... Opening/closing valve, 31... Regulating piping line, 32... First pipeline system, 33...
...Second pipeline system, 34...Check valve, 35...Heating on/off valve, 36... Throttle pipe section, 37...Check valve, 38
...Cooling on-off valve, 39... On-off valve, 41... Regulating piping line, 42... Third pipe system, 43.
... Fourth pipe system, 44... Check valve, 45... Throttle pipe section, 46... Check valve.

Claims (1)

[Claims] 1. A plurality of air conditioning units including an indoor heat exchanger, an indoor blower, etc., and a heat pump type heat source unit including a compressor, an outside air heat exchanger, an outside air blower, etc. In a simultaneous air conditioning method for multiple locations, each air conditioning unit is equipped with the first opening of a three-way valve at one end of the pipe line of the indoor heat exchanger, or branched into two systems and provided with an on-off valve for each. The provided pipes are connected to each other, and a regulating pipe line is connected to the other end of the pipe line, and this regulating pipe line branches into a first pipe line system and a second pipe line system, and the first pipe line The system is provided with an opening to discharge condensed liquid refrigerant in that direction when the pressure in the indoor heat exchanger of the air conditioning unit becomes higher than the pressure on the opposite side of the first line system to the heat exchanger. A check valve and a heating opening/closing valve are provided in the second pipe system, and the pressure inside the indoor heat exchanger is lower than the pressure on the opposite side of the second pipe system with respect to the heat exchanger. The heat pump type heat source unit is equipped with a check valve and an air-conditioning on/off valve to open and draw the refrigerant into the indoor heat exchanger through the throttle pipe section. A high-pressure gas pipe connects the air heat exchanger to the compressor and sends gaseous refrigerant, a low-pressure gas pipe connects the outside air heat exchanger and the compressor suction pipe and sends the gaseous refrigerant, and the outside air heat exchanger connects to each air conditioner. A liquid pipe that directly sends liquid refrigerant to the unit is provided, and a regulating pipe line is interposed between the liquid pipe and the outside air heat exchanger, and this regulating pipe line is connected to a third pipe system and a fourth pipe line. The third pipe system is equipped with a non-return check that opens when the pressure inside the outside air heat exchanger becomes higher than the pressure in the liquid pipes and releases the condensed liquid refrigerant from the outside air heat exchanger to the liquid pipes. A check valve is provided in the fourth pipe system to suck liquid refrigerant from the liquid pipe through the throttle pipe when the pressure in the outside air heat exchanger becomes lower than the pressure in the liquid pipe. The high-pressure gas pipe and the low-pressure gas pipe are connected to the outside air heat exchanger, and an on-off valve is provided between the outside air heat exchanger and the compressor, and an on-off valve is provided between the on-off valve and the compressor. The high-pressure gas pipe is connected to the second opening of a three-way valve connected to one end of the pipe of the indoor heat exchanger, or to one of the pipes branching into two systems, and the low-pressure gas pipe is The liquid pipe is connected to the third opening of the three-way valve connected to one end of the pipe line of the indoor heat exchanger, or to the other side of the pipe branching into two systems, and the liquid pipe is connected to the third opening of the three-way valve connected to one end of the pipe line of the indoor heat exchanger. The discharge port of the first pipe system and the suction port of the second pipe system are connected together, and the lower limit pressure of the high-pressure gas pipe and the upper limit pressure of the low-pressure gas pipe are set such that the former is higher than the latter, based on a constant pressure value. If the pressure in the high-pressure gas pipe exceeds the upper limit pressure value, the on-off valve of the heat source unit installed on the high-pressure gas pipe will be opened, and the pressure in the low-pressure gas pipe will be lowered. When the pressure drops below the lower limit value, the on-off valve of the heat source unit provided in the low-pressure gas pipe is opened, and in each air conditioning unit, when heating is required, the first opening and the second opening of the three-way valve are communicated. Or, at the same time, one of the on-off valves of the pipe that branches into two systems is opened, and the heating on-off valve is opened and closed, and when cooling is required, the first opening and the third opening of the three-way valve are communicated. Alternatively, the other on-off valve of the pipe that branches into two systems is opened, and the cooling on-off valve is opened and closed, and these are controlled for each air conditioning unit as appropriate depending on the temperature of the installation location in the room. Simultaneous air conditioning method for multiple locations.