KR200144285Y1 - Multi air conditioner - Google Patents

Abstract

The present invention relates to a multi-air conditioner, in a multi-air conditioner for cooling a plurality of spaces by installing a plurality of indoor units corresponding to one outdoor unit, a condenser assembly comprising a compressor and a plurality of heat exchangers for compressing a refrigerant in the outdoor unit is installed, A plurality of heat exchangers are paired one by one, and a plurality of first pipes for connecting the refrigerant inflow side of the pair of heat exchangers to the compressor, and a plurality of first solenoid valves selectively operated in the first pipes are installed. A plurality of second pipes which connect the remaining heat exchanger to the indoor unit of the pair of heat exchangers and branch from two to two parts, and a plurality of third solenoid valves selectively installed on both sides of the plurality of second pipes for branching; A plurality of third branches branched from one of the branch pipes of the plurality of second pipes and connected to the compressor; A plurality of fourth solenoid valves selectively installed on a second pipe between the indoor unit at a point where the pipe, the plurality of third pipes and the plurality of second pipes are connected, and a plurality of connecting pairs of heat exchangers; A fourth pipe, a second solenoid valve installed in the fourth pipe and selectively operated, and a plurality of capillary tubes provided at both ends of the second solenoid valve are provided to prevent overcooling from occurring around the evaporator of the indoor unit. Accumulators and receivers are unnecessary, which can reduce costs.

Description

Multi air conditioner

The present invention relates to a separate air conditioner, and more particularly, to a multi air conditioner (multi air conditioner) provided with a plurality of indoor units in the outdoor period.

In general, a separate air conditioner using a cooling cycle liquefies a refrigerant compressed in a compressor of an outdoor unit in a condenser and vaporizes it again in an evaporator of an indoor unit through an expansion valve. By cooling the room.

The multi-type air conditioner, which is a kind of the separate air conditioner, typically installs one outdoor unit outdoors, and indoors are installed in each of a plurality of spaces to be cooled to cool the room.

The configuration of such a multi-type air conditioner is schematically shown in FIG.

In the outdoor unit OU, a compressor CP for compressing a low pressure gas refrigerant into a high pressure gas refrigerant is installed, and the compressed refrigerant is liquefied into a high pressure liquid refrigerant in the condenser CN. The condensation heat generated at this time is discharged to the outside by a heat radiating fan (not shown), and the liquefied high-pressure liquid refrigerant is supplied by a plurality of solenoid valves SN installed in an outdoor unit OU via a receiver tank (RT). It selectively flows into each indoor unit IU1 to 3.

Then, the high pressure liquid refrigerant is pressure-falled into the low pressure liquid refrigerant from the expansion valve EX installed in each indoor unit. This low pressure liquid refrigerant is vaporized into low-pressure gas refrigerant in the evaporator (EP1 ~ 3) installed in each indoor unit (IU1 ~ 3), absorbing heat around the evaporator (EP1 ~ 3) to cool the air Generate. The cold air is blown into each room by a blowing fan (not shown) installed in each indoor unit IU1 to 3 to cool the room.

The vaporized low pressure gas refrigerant is filtered from the accumulator (AC), and the liquid component contained in the refrigerant is introduced into the compressor (CP).

However, in the conventional multi-air conditioner, when the indoor unit is selectively used among the plurality of indoor units IU1 to 3, the refrigerant is circulated only to the indoor unit to be used without the refrigerant being circulated to the unused indoor unit. That is, since the refrigerant circulated by the compressor CP has to have a predetermined action in the evaporators EP1 to 3 installed in the plurality of indoor units IU1 to 3, the capacity or the amount of the refrigerant of the compressor CP may be several to the indoor units IU1 to 3. 3) is made on the basis of use. Therefore, if the indoor unit is selectively used, the liquid refrigerant that is not evaporated in the supercooling and the evaporator is introduced into the compressor in the refrigerant circulating the evaporator in the indoor unit to be used to cause damage to the compressor.

In addition, since the accumulator (AC) and the receiver (RT) must be installed so that the refrigerant can be smoothly changed and circulated, the cost increases.

The present invention is to solve such a conventional problem, it is possible to prevent the overcooling in the evaporator installed in the indoor unit to be selectively used, the capacity of the condenser can be properly selected and the evaporator installed in each indoor unit can function properly. Another object of the present invention is to provide a multi-air conditioner, which enables a smooth refrigerant circulation even when an accumulator or a receiver is not used.

1 is a block diagram of a separate type air conditioner according to a preferred embodiment of the present invention

<Description of the code | symbol about the principal part of drawing>

100 input unit 200 processing unit

300: control unit

In order to achieve the above object, the present invention is a multi-air conditioner for cooling by installing a plurality of indoor units corresponding to one outdoor unit, the compressor is installed in the outdoor unit to compress the refrigerant, and is provided in the outdoor unit consists of a plurality of heat exchangers A plurality of first pipes for connecting the condenser assembly, a plurality of heat exchangers in pairs and connecting the refrigerant inflow side of the pair of heat exchangers to the compressor, and a plurality of first pipes installed selectively in the first pipes. A plurality of second pipes which connect the solenoid valve, the remaining heat exchanger in the pair of heat exchangers to the indoor unit and branch from two to two parts, and a plurality of third selectively installed on both sides of the plurality of second pipes. Branched from one of the solenoid valves and the branched pipes of the plurality of second pipes and connected to the compressor A plurality of fourth solenoid valves installed on a second pipe between the indoor units and selectively operated at a point where the plurality of third pipes, the plurality of third pipes and the plurality of second pipes are connected, and a pair of heat exchangers And a plurality of fourth pipes, a second solenoid valve installed on the fourth pipe and selectively operated, and a plurality of capillary tubes provided at both ends of the second solenoid valve.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 2 shows a multi-air conditioner comprising first, second and third rooms in which the first, second and third evaporators are installed, and an outdoor unit in which the condenser and the compressor are installed.

In the outdoor unit 100 to be installed outdoors, a compressor 10 for compressing a low-pressure steam refrigerant into a high-pressure steam refrigerant is installed, and the compressor 10 is provided with a first pipe 20. Branched to each other, the first solenoid valves 21a to 21c are provided at each branched branch.

In addition, the third pipes 25a to 25c are also installed at the portion where the refrigerant flows into the compressor 10, and the third pipes 25a to 25c collect the refrigerant flowing from the subdivided portion into a single compressor 10. To get into

In addition, in the outdoor unit 100, a condenser assembly 90 for condensing the high-pressure steam refrigerant compressed by the compressor 10 into the high-pressure liquid refrigerant is installed, and the condenser assembly 90 includes six parts of the first to sixth parts. Heat exchangers 91a to 91f are formed, and these first to sixth heat exchangers 91a to 91f are paired with first and second heat exchangers 91a and 91b, and similarly, third, fourth and fifth and sixth. The heat exchanger 91c, 91d, 91e, 91f is paired. In each of the paired heat exchangers, the first, third and fifth heat exchangers 91a, 91c and 91e become condensers for condensing the high-pressure vapor refrigerant and converting it into a high-pressure liquid refrigerant. The six heat exchangers 91b, 91d and 91f condense the high pressure steam refrigerant or vaporize the low pressure liquid refrigerant into the low pressure steam refrigerant.

Thus, between the heat exchangers (91a ~ 91f) that are in contact with each other to install a heat insulating material (95) to prevent heat transfer.

The first and second heat exchangers 91a and 91b, the third and fourth heat exchangers 91c and 91d, and the fifth and sixth heat exchangers 91e and 91f are connected to the connection tube 97. Second solenoid valves 99a to 99c are installed in the respective connection tubes 97, and the capillary tube 98 is connected to both of the second solenoid valves 99a to 99c.

In addition, the second pipes 30 are connected to the second, fourth, and sixth heat exchangers 91b, 91d, and 91f to flow out the refrigerant by branching in two directions. , 2, 3 indoors (200a ~ 200c) of the first, 2, 3 evaporators (210a ~ 210c) are connected, and the two second pipes 30 are branched to each of the third solenoid valve (31aa) (31ab) 31ba, 31bb, 31ca and 31cb are provided.

In addition, the third pipe (25a ~ 25c) is branched again in any one of the two pipes branched from the second pipe 30, the third pipe (25a ~ 25c) is connected to the compressor 10 again And fourth solenoid valves 41a to 41c in the second pipes 30 between the first, second and third evaporators 210a to 210c of the first, second and third rooms 200a to 200c at the branching points. Is installed.

Meanwhile, a plurality of service valves 50 are installed in the case 101 forming the exterior of the outdoor unit 100 so that the second, fourth and sixth heat exchangers 91b and 91d (inside the outdoor unit 100 are installed) ( The second pipes 30 connected to the 91f) are connected to each other, and the sub pipes 201 are installed in the evaporators 210a to 210c of the indoor units 200a to 200c. The valve 50 is connected correspondingly.

Then, in the plurality of sub-pipes 201 connected to the first, second and third evaporators 210a to 210c inside the first, second and third indoor chambers 200a to 200c, the refrigerant flows into the evaporator at a high pressure. First, second and third expansion valves 60 are provided to pressure-tighten the liquid refrigerant and change it into a low pressure liquid refrigerant.

In the multi-air conditioner having the above-described structure, for example, when the first indoor unit 210a is operated, the compressed high-pressure steam refrigerant passes through the first solenoid valve 21a to allow the first heat exchanger ( 91a) and then through the second solenoid valve 99a and into the second heat exchanger 91b, as shown in FIG. 3A, in these first and second heat exchangers 91a and 91b. It is converted to a high pressure liquid refrigerant.

This high-pressure liquid refrigerant has a valve 31ab on the compressor 10 side and a fourth solenoid valve 41a of the third solenoid valves 31aa and 31ab, and the third solenoid valves 31aa and 31ab. Since the valve 31aa of the indoor unit 200a side is open, it passes through the indoor unit side valve 31aa of the 3rd solenoid valve, and flows into the 1st indoor chamber 200a.

The high pressure liquid refrigerant flowing into the first chamber (200a) is pressure-strengthened to the low pressure liquid refrigerant in the first expansion valve (60), and the low pressure liquid refrigerant passes through the first evaporator (210a) to vaporize Converted to gas refrigerant. Accordingly, cold air is formed around the first evaporator 210a, and is blown into the room by a blower fan (not shown).

For example, when the second chamber 200b is not operated, the high pressure steam refrigerant passing through the first solenoid valve 21b is transferred to the high pressure liquid refrigerant from the third heat exchanger 91c serving as a condenser. This high-pressure liquid refrigerant is converted into a low-pressure liquid refrigerant while passing through the capillary tube 98 because the second solenoid valve 99b is closed, as shown in Fig. 3B. The low pressure liquid refrigerant flows into the fourth heat exchanger 91d serving as an evaporator and vaporizes into a low pressure gas refrigerant. The low pressure gas refrigerant is opened to the compressor 10 side of the third solenoid valve 31bb. After passing through, the fourth solenoid valve 41b is closed and flows back into the compressor 10.

In the multi-air conditioner having such a structure, the refrigerant compressed in the compressor 10 continues to circulate inside the condenser assembly 90 even when there is an indoor unit which is not operated among the first, second, and third indoor chambers 200a to 200c. As in the multi-air conditioner of the indoor unit, the refrigerant is concentrated in the evaporator of the indoor unit in operation to prevent supercooling from occurring around the evaporator.

Also, even if several indoor units are operated, heat exchangers corresponding to each indoor unit are installed so that proper circulation of the refrigerant is possible, and since the state of the refrigerant is smoothly changed, the accumulator and receiver are unnecessary, thereby reducing the cost. You can get it.

As described above, the multi-air conditioner according to the present invention can smoothly change the state of the refrigerant, can reduce the cost of the product by reducing the parts, thereby greatly improving the reliability of the product compared to the conventional product.

Claims (2)

In a multi-air conditioner for cooling by installing several indoor units corresponding to one outdoor unit 100, A compressor (10) installed in the outdoor unit (100) for compressing a refrigerant; A condenser assembly 90 installed in the outdoor unit 100 and comprising a plurality of heat exchangers; A plurality of first pipes 20 for pairing the plurality of heat exchangers 91a to 91f and connecting a side into which the refrigerant flows from the pair of heat exchangers to the compressor 10; A plurality of first solenoid valves 21a to 21c installed in the first pipe 20 and selectively operated; A plurality of second pipes 30 which connect the remaining heat exchanger to the indoor unit among the pair of heat exchangers and branch from two portions to two portions; A plurality of third solenoid valves (31aa) (31ab) (31ba) (31bb) (31ca) (31cb) installed on both sides of the plurality of second pipes (30) and selectively operated; A plurality of third pipes 25a to 25c branched from one of the pipes branched from the plurality of second pipes 30 and connected to the compressor 10; A plurality of selectively installed on the second pipe 30 between the indoor units 200a to 200c from a point where the plurality of third pipes 25a to 25c and the plurality of second pipes 30 are connected. Fourth solenoid valves 41a to 41c; A plurality of connection pipes (97) connecting the pair of heat exchangers; Second solenoid valves 99a to 99c installed in the plurality of connection pipes 97 and selectively operated; And a plurality of capillary tubes (98) provided at both ends of the second solenoid valves (99a to 99c). The method of claim 1, Multi-air conditioner, characterized in that to prevent the heat transfer by installing a heat insulating material (95) between the plurality of heat exchangers (91a ~ 91f).