JPH02195132A - Multi-room air cooling and heating device - Google Patents

Abstract

PURPOSE:To make it possible to select freely either cooling operation or heating operation by installing a third auxiliary heat exchanger in parallel with an application side heat exchanger, and a fourth auxiliary heat exchanger which is integrated with said third heat exchanger so as to carry out heat exchange. CONSTITUTION:A heat source side heat exchanger is separated from an application side refrigerant cycle. To the application side refrigerant cycle are installed a main indoor unit 24 having an application side heat exchanger 23. An third auxiliary heat exchanger 26 is installed in parallel to this application side heat exchanger. A fourth heat exchanger 27 which is integrated with the third auxiliary heat exchanger so as to carry out heat exchange, is installed. An auxiliary refrigerant cycle, which is continuously connected with the fourth heat exchange, an auxiliary compressor 28, an auxiliary heat exchanger 31, an auxiliary four way valve 29, and an auxiliary decompression device 30 in a circle, are installed therein. As a result, the auxiliary refrigerant cycle is capable of performing cooling operation or heating operation irrespective of the operation of the heat source side refrigerant cycle and the application side refrigerant cycle. Therefore, an indoor unit f even if it is a single set, is capable of selecting freely either cooling operation or heating operation respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant cycle for a multi-room heating and cooling system.

2. Description of the Related Art A refrigerant cycle for a multi-room air-conditioning system that is separated into a heat source refrigerant cycle and a user-side refrigerant cycle and exchanges heat with an auxiliary heat exchanger is disclosed in Japanese Patent Laid-Open No. 62-238964. It looks like Figure 2. In the figure,
11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger,
14 is a pressure reducing device for cooling; 15 is a heating pressure reducing device; 16 is a check valve that closes the cooling pressure reducing device 14 during heating; 17 is a check valve that closes the heating pressure reducing device 16 during cooling; 1st
These are connected in a ring with an auxiliary heat exchanger to form a heat source side refrigerant cycle. A second auxiliary port exchanger 19 is integrally formed to exchange heat with the first auxiliary heat exchanger 18. 20 is a refrigerant amount adjustment tank that adjusts the amount of refrigeration during cooling and heating.

Reference numeral 21 denotes a refrigerant conveying device which has a reversible characteristic in which the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in an outdoor unit) f. 22a.

22b is a heat exchanger on the user side, which is housed in the indoor units q and h, and is connected to the outdoor unit f through connecting pipes 'tl' and J+3'. The second auxiliary heat exchanger 19 and the refrigerant amount adjustment tank 20. Refrigerant transport device 21, user-side heat exchangers 22a, 22b, and connection piping 'tl'tj, I'
are connected in a ring to form a till refrigerant cycle.

The operation of the multi-room heating and cooling system configured as described above will be explained.

During cooling operation, the refrigerant cycle is indicated by the solid line in the figure. In the refrigerant cycle on the heat source side, high-temperature, high-pressure gas from the compressor 11 passes through the four-way valve 12, radiates heat in the heat exchanger 13 on the heat source side, condenses and liquefies, and passes through the check valve 1θ. The pressure is reduced by the cooling expansion valve 14 through the
Evaporates in the auxiliary heat exchanger 18 and passes through the four-way valve 12 to the compressor 1
Cycle to 2.

At this time, the second auxiliary heat exchanger 19 of the user-side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and the refrigerant amount adjustment tank 20 is The refrigerant is sent to the refrigerant conveying device 21, and by this refrigerant conveying device 21, it is sent to the user-side heat exchanger 22 a s 22 b through the connecting pipe '++, where it is absorbed, evaporated, gasified, and sent to the connecting pipe l'j' to the second auxiliary heat exchanger 19.

On the other hand, during heating operation, the refrigerant cycle is indicated by the broken line in the figure, and in the heat source side refrigerant cycle, the high-temperature, high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger S 18, where it radiates heat. It is condensed and liquefied, the pressure is reduced by the heating pressure reducing device 15 from the check valve 17, and it is endothermically evaporated in the heat source side heat exchanger 13.
It circulates through the four-way valve 12 to the compressor 11. At this time, the second auxiliary heat exchanger 19 of the user-side refrigerant cycle and the first auxiliary heat exchanger 1'9! ! The refrigerant 18 exchanges heat, and the liquid refrigerant in the user side refrigerant cycle is heated and gasified, and the connecting pipe 1 /
, ] / is sent to the user-side heat exchanger 22, where it is heated and liquefied to release heat.
1 and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

Problems to be Solved by the Invention However, in the above configuration, the indoor unit) q rh
can only operate in the same way as outdoor unit) f. For example, if outdoor unit (f) is used for cooling, indoor units q and h can also only be used for cooling.

Therefore, if there are indoor rooms that require cooling operation and indoor rooms that require heating operation due to the indoor load during the interim period, it is not possible to operate both at the same time, so it is necessary to install a separate heating and cooling system. Therefore, the problem was that the mounting was complicated.

The present invention is directed to the above-mentioned section (j) by providing a multi-room air conditioning/heating system that has a simple configuration, has one outdoor unit, and allows each indoor unit to freely select between cooling operation or heating operation.

Means for Solving the Problems In order to solve the above problems, the multi-room air conditioning system of the present invention separates the heat source sub-refrigerant cycle and the utilization sub-refrigerant cycle,
an outdoor unit that includes the heat source 1 full refrigerant cycle, a second auxiliary heat exchanger for the user-side refrigerant cycle, and a refrigerant transfer device 4; and a main indoor unit that includes the user-side heat exchanger and operates in the same manner as the heat source-side refrigerant cycle. and a third heat exchanger installed in parallel with the user-side heat exchanger and exchanging heat with the user-side refrigerant cycle.
An auxiliary heat exchanger, a fourth auxiliary heat exchanger that is formed integrally with the third auxiliary heat exchanger and exchanges heat, an auxiliary compressor, an auxiliary chamber first exchanger, an auxiliary pressure reducing device, and an auxiliary four-way valve are connected in an annular manner. and an auxiliary indoor unit that is equipped with the third auxiliary heat exchanger and the auxiliary refrigerant cycle and is capable of operating in the same or different manner as the heat source side unit.

Effects According to the present invention, with the above-described configuration, it is possible to select heating and cooling operation for each indoor unit with respect to one outdoor unit.

EXAMPLE Hereinafter, a multi-room air conditioning system according to an example of the present invention will be described with reference to one drawing. FIG. 1 shows a refrigerant cycle of a multi-room air conditioning system according to an embodiment of the present invention.

In the figure, 11 is a compressor, 12 is a four-way valve, 13 is a heat source side heat exchanger, 14 is a cooling pressure reducing device, 16 is a heating pressure reducing device, and 16 is a check that closes the cooling pressure reducing device 14 during heating. Valve 17 is a check valve that closes the pressure reducing device 16 for heating during cooling, and 18 is a first auxiliary heat exchanger, which are connected in an annular manner.

It forms a heat source side refrigerant cycle. A second auxiliary heat exchanger 19 is integrally formed to exchange heat with the first auxiliary heat exchanger 18. 2o is a refrigerant amount adjustment tank that adjusts the amount of refrigeration during cooling and heating. Reference numeral 21 denotes a refrigerant conveying device which has a reversible characteristic such that the outflow direction of the refrigerant is opposite during cooling and heating, and is housed in the outdoor unit 1. 23 is a heat exchanger on the user side, which is housed in the main indoor unit 24 and has main connection piping 251! , 2sb is connected to outdoor 22)f.

26 is a third auxiliary heat exchanger communicating with the main connection pipes 25a and 25b, 27 is a fourth auxiliary heat exchanger that is formed integrally with the third auxiliary heat exchanger and exchanges heat, 28 is an auxiliary compressor,
Reference numeral 29 denotes an auxiliary four-way valve, 30 an auxiliary pressure reducing device, and 31 an auxiliary indoor heat exchanger that can perform heating and cooling using the auxiliary compressor 28. Connection piping 25a
, 25b.

The second auxiliary heat exchanger 19, the refrigerant amount adjustment tank 20, and the refrigerant conveyance device 21. Usage side heat exchanger, third auxiliary heat exchanger and main connection pipes 25a, 25b, auxiliary connection pipe 33a,
33b are connected in an annular manner to form a user-side refrigerant cycle, and the fourth auxiliary heat exchanger 27.degree. auxiliary compressor 28. Auxiliary four-way valve 29. The auxiliary pressure reducing device 30 and the auxiliary indoor heat exchanger 31 are connected in an annular manner to form an auxiliary refrigerant cycle.

The operation of the multi-room heating and cooling system configured as described above will be explained.

During cooling operation, the refrigerant cycle is indicated by the solid line in the figure. In the refrigerant cycle on the heat source side, high-temperature, high-pressure gas from the compressor 11 passes through the four-way valve 12, radiates heat in the heat exchanger 13 on the heat source side, condenses and liquefies, and passes through the check valve. 16 and is depressurized by the cooling expansion valve 14.
It is evaporated in the auxiliary heat exchanger 18 and passed through the four-way valve 12 to the compressor 1.
Cycle to 2.

At this time, the second auxiliary heat exchanger 19 of the user-side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the gas refrigerant in the user-side refrigerant cycle is cooled and liquefied, and passes through the refrigerant amount adjustment tank 2o. The refrigerant is sent to the refrigerant conveying device 21, and by this refrigerant conveying device 21, it is sent to the user-side heat exchanger 23 through the main connecting pipe 26b, where it is endothermically evaporated, gasified, and passed through the main connecting pipe 23a as second auxiliary heat. It will be circulated to the exchanger 19.

Also, the third auxiliary heat exchanger 2 passes through the auxiliary connection pipe 33b.
The liquid refrigerant also flows from the refrigerant transport device 21 to the refrigerant 6, exchanges heat with the fourth auxiliary heat exchanger 27, passes through the auxiliary connection pipe 33a, and flows to the main connection pipe 25a.

At this time, when the auxiliary indoor unit 32 is in cooling operation, in the auxiliary refrigerant cycle, the high temperature and high pressure gas from the auxiliary compressor 28 is passed through the auxiliary four-way valve 29, and the fourth auxiliary heat exchanger 2
It releases heat at T, condenses and liquefies, is depressurized by the auxiliary pressure reducing device 30, is endothermically evaporated and cooled by the auxiliary indoor heat exchanger 31, and is circulated to the auxiliary pressure compressor 28 through the auxiliary four-way valve 29. In addition, when the auxiliary indoor unit 32 is in heating operation, the high-temperature, high-pressure gas from the auxiliary compressor 28 is sent to the auxiliary indoor heat exchanger 31 through the auxiliary four-way valve 29, liquefies heat and heats it, and auxiliary pressure reduction. The pressure is reduced in the device 3o, endothermically evaporated in the fourth auxiliary heat exchanger 27, and passed through the auxiliary four-way valve 29 for auxiliary compression 'F! to 2
Cycle to 8.

On the other hand, during heating operation, the refrigerant cycle is indicated by the broken line in the figure, and in the 1st and 4th source side refrigerant cycle, the high-temperature, high-pressure refrigerant from the compressor 11 is sent from the four-way valve 12 to the first auxiliary heat exchanger 1st, and the heat is radiated. It is condensed and liquefied.

The pressure is reduced from the check valve 17 with the heating vacuum bag a15, the heat is absorbed and evaporated in the heat source side heat exchanger 13, and the air is passed through the four-way valve 12 to the compressor 1.
Cycle to 1. At this time, the second auxiliary heat exchanger 19 of the user-side refrigerant cycle and the first auxiliary heat exchanger 18 exchange heat, and the liquid refrigerant in the user-side refrigerant cycle is heated and gasified, and is used through the connecting pipe 25a. Sent to n1 heat exchange u23,
It is heated, radiates heat, liquefies it, and is sent to the refrigerant conveyance device 21 through the connection pipe 26b, and circulated from the refrigerant amount adjustment tank 20 to the second auxiliary heat exchanger 19.

The third auxiliary heat exchanger 26 also passes through the auxiliary connection pipe 33a.
The gas refrigerant from the refrigerant transport device 21 also flows therein, exchanges heat with the fourth auxiliary heat exchanger 27, passes through the auxiliary connection pipe 33b, and flows to the main connection pipe 26b.

At this time, when the auxiliary indoor unit 32 is in cooling operation, in the auxiliary refrigerant cycle, the high-temperature, high-pressure gas from the auxiliary compressor 28 passes through the auxiliary four-way valve 29 and passes through the fourth auxiliary heat exchanger 27.
It radiates heat and condenses and liquefies, is depressurized in the auxiliary pressure reducing device 30, is endothermically evaporated in the auxiliary indoor heat exchanger "a", 31, is cooled, and is circulated through the auxiliary four-way valve 29 to the auxiliary compressor 28.

As described above, according to this embodiment, the four source-side refrigerant cycles and the user-side refrigerant cycle are separated, and the user-side refrigerant cycle has a main indoor unit that has a user-side heat exchanger, and a A third auxiliary heat exchanger*i is provided at Since it is equipped with an auxiliary refrigerant cycle in which an exchanger, an auxiliary four-way valve, and an auxiliary pressure reducing device are connected in a ring, the auxiliary refrigerant cycle can perform cooling or heating operation regardless of the operation of the heat source side refrigerant cycle and the user side refrigerant cycle. will be possible.

Therefore, with only one outdoor unit, each indoor unit can freely select cooling operation or heating operation.

In the example shown, there is one main indoor unit and one auxiliary indoor unit, but it goes without saying that any number of each may be used.

Effects of the Invention As described above, the present invention provides a heat source side refrigerant cycle and a
The main indoor unit has a user-side heat exchanger in the user-side refrigerant cycle, and a third auxiliary heat exchanger-1 is installed in parallel with this user-side heat exchanger. A fourth unit is formed integrally with the auxiliary heat exchanger to exchange heat.
An auxiliary heat exchanger is provided, and an auxiliary refrigerant cycle is provided in which this fourth auxiliary heat exchanger, an auxiliary compressor, an auxiliary indoor heat exchanger, an auxiliary four-way valve, and an auxiliary pressure reducing device are connected in an annular manner. The auxiliary refrigerant cycle can perform cooling or heating operation regardless of the operation of the user-side refrigerant cycle.

Therefore, with only one outdoor unit, each indoor unit can freely choose between cooling operation or heating operation, and depending on the indoor load such as during the interim period, it may be necessary to perform cooling operation, indoor operation, or heating operation. This has the effect of allowing one outdoor unit to be operated at the same time with a simple configuration when indoors are mixed.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant cycle diagram of a multi-room air-conditioning and heating system d in one embodiment of the present invention, and FIG. 2 is a refrigerant cycle diagram of a conventional multi-room air-conditioning and heating system. 11... Heat source side compressor, 13... Heat source side heat exchanger, 18... First auxiliary heat exchanger, 1.
9... Second auxiliary heat exchanger, 21... Refrigerant conveyance device, 23... User side heat exchanger, 24...
...Main indoor unit, 26...Third auxiliary heat exchanger, 27...Fourth auxiliary heat exchanger, 28.
...1 auxiliary pressure unit, 29... auxiliary four-way valve,
30...Auxiliary pressure reducing device 1.31...Auxiliary indoor heat exchanger, :32...Auxiliary indoor unit, f...Outdoor unit.

Claims (1)

[Claims] A heat source side refrigerant cycle formed by connecting a heat source side compressor, a heat source side four-way valve, a heat source side heat exchanger, a heat source side pressure reducing device, and a first auxiliary heat exchanger in an annular manner, and integrally with the first auxiliary heat exchanger. a user-side refrigerant cycle in which a second auxiliary heat exchanger, a refrigerant transport device, and a user-side heat exchanger are connected in a ring, and a second auxiliary heat exchanger between the heat source-side refrigerant cycle and the user-side refrigerant cycle; an outdoor unit equipped with a refrigerant transfer device, a main indoor unit equipped with a user-side heat exchanger and operated in the same manner as the heat source-side refrigerant cycle, and a main indoor unit that is installed in parallel with the user-side heat exchanger and is connected to the user-side refrigerant cycle. A third auxiliary heat exchanger to be exchanged, a fourth auxiliary heat exchanger formed integrally with this third auxiliary heat exchanger and exchanging heat, an auxiliary compressor, an auxiliary indoor heat exchanger, an auxiliary pressure reducing device, and an auxiliary four-way valve. A multi-room air conditioning/heating system comprising an auxiliary refrigerant cycle connected in an annular manner, and an auxiliary indoor unit that includes the third auxiliary heat exchanger and the auxiliary refrigerant cycle and is capable of operating in the same manner as or different from the heat source side unit.