KR100210078B1 - Coolant control device of multi assembled airconditioner - Google Patents

Abstract

The present invention relates to a refrigerant control apparatus for a multi-combination type air conditioner and includes a compressor (22), a condenser (24), a refrigerant distributor (26), a large capacity indoor unit (30), first and second low capacity indoor units And a bypass portion 28 is provided between the outlet of the condenser 24 and the inlet of the compressor 22 so that the bypass portion 28 is disposed between the evaporator A, It is possible not only to improve the cooling capacity by appropriately supplying the refrigerant to the evaporator of each indoor unit without using the receiver, but also to perform the cooling suitable for the size of the room.

Description

Refrigerant control device of multi-combination type air conditioner

More particularly, the present invention relates to a refrigerant control apparatus for a multi-combination type air conditioner in which a refrigerant discharged from an evaporator of a plurality of indoor units having different capacities is compressed and condensed in one outdoor unit, The present invention relates to a refrigerant control apparatus for a multi-combination type air conditioner that distributes the refrigerant to an evaporator of each indoor unit using a valve, a capillary tube, and a bypass tube.

Generally, a rotary compressor or a scroll compressor is mainly used as a compressor of an air conditioner. The rotary compressor is mainly used in a small-capacity air conditioner with a small capacity, and a receiver is installed.

On the other hand, a scroll compressor is mainly used in a multi-combination type air conditioner having a large capacity. However, if the receiver is not provided in the scroll compressor, the receiver must be installed separately.

Since the present invention relates to a multi-combination type air conditioner, the term 'compressor' described in the following description means a scroll compressor.

As shown in FIG. 1, one conventional 7-balance indoor unit 3 and two 9-balance indoor units 5 and 7 are connected to one outdoor unit 1, respectively.

As shown in FIG. 2, the conventional multi-combination air conditioner includes a compressor 11 for compressing low-temperature and low-pressure gas refrigerant and discharging high-temperature and high-pressure gas refrigerant, (13) for cooling the high-temperature and high-pressure gas refrigerant discharged from the compressor (11) and liquefying the refrigerant into liquid refrigerant of room temperature and high pressure, and discharging the liquid refrigerant of room temperature and high pressure discharged from the condenser (13) Pressure liquid refrigerant flowing through the first to fourth solenoid valves SV10, SV11, SV12, and SV13 and the first to fourth solenoid valves SV10, SV11, SV12, and SV13 to expand the low- First to fourth capillaries C10, C11, C12 and C13 which are converted into liquid refrigerant of the first to third indoor units 3, 5 and 7 and flow out to the evaporators D, E and F of the first to third indoor units 3, 5 and 7, Low-pressure gas refrigerant vaporized in the evaporators (D, E, F) of the first to third indoor units (3, 5, 7) It is configured, including the receiver (15) for supply to the compressor (11) for separating the sheets.

In the conventional multi-combination type air conditioner configured as described above, the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is converted into a liquid refrigerant of normal temperature and high pressure in the condenser 13 and is supplied to the first to fourth solenoid valves SV10, SV11, SV12, and SV13.

The first to fourth solenoid valves SV10, SV11, SV12, and SV13 are opened and closed by a controller (not shown) so that the liquid refrigerant of room temperature and high pressure, which is discharged from the condenser 13, Low temperature and low pressure liquid refrigerant expanded through the first to fourth solenoid valves SV10, SV11, SV12, and SV13 and the first to fourth capillaries C10, C11, C12, and C13 flows through the first to third indoor units 3 and 5 E and F of the first to third indoor units 3, 5 and 7 in accordance with the operating states of the first to third indoor units 3,

At this time, when only a small capacity indoor unit is in operation, the liquid refrigerant of room temperature and high pressure discharged from the condenser 13 is supplied to the bypass solenoid valve SV-BY and the bypass capillary C- BY) to the receiver (15).

The low-temperature and low-pressure refrigerant supplied to the evaporators D, E and F of the first to third indoor units 3, 5 and 7 through the first to fourth capillaries C10, C11, C12 and C13 Liquid refrigerant is evaporated in the evaporators D, E and F of the first to third indoor units 3, 5 and 7 to be converted into low-temperature and low-pressure gas refrigerants. At this time, the first to third indoor units (D, E, F) of the evaporator (3, 5, 7) is lowered and the cooled air is supplied to the room by rotating the blowing motor.

Since the low-temperature and low-pressure gas refrigerants evaporated in the evaporators D, E and F of the first to third indoor units 3, 5 and 7 are mixed with some liquid refrigerant as described above, The liquid refrigerant is separated from the liquid refrigerant through the receiver 15. The gas refrigerant separated by the liquid receiver 15 is sucked into the compressor 11 and is discharged to the compressor 11 at a high temperature, Pressure gas refrigerant.

At this time, the first to fourth solenoid valves SV10, SV11, SV12, and SV13 and the bypass solenoid valve SV-BY are opened and closed by a controller (not shown) as shown in Table 1 below.

That is, when all of the indoor units 3, 5, and 7 are operated at the same time, the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is converted into the liquid refrigerant of normal temperature and high pressure in the condenser 13, And flows into the evaporator (D) of the first indoor unit (3) through the first capillary (C10), the second solenoid valve (SV11) and the second capillary (C11) The refrigerant flows into the evaporator E of the second indoor unit 5 through the first capillary tube C10, the third solenoid valve SV12 and the third capillary tube C12, High pressure liquid refrigerant flows into the evaporator F of the third indoor unit 7 through the first capillary tube C10 and the fourth solenoid valve SV13 and the fourth capillary tube C13.

At this time, the bypass solenoid valve SY-BY is closed.

When two of the indoor units 3, 5, and 7 are operated at the same time, the high-temperature, high-pressure gas refrigerant discharged from the compressor 11 is converted into the liquid refrigerant of normal temperature and high pressure in the condenser 13, Two of the two evaporators A, B and C are connected through the first capillary C10 via two solenoid valves SV11, SV12 and SV13 and capillaries C11, C12 and C13 connected thereto, ).

At this time, the bypass solenoid valve SY-BY is closed.

When only one of the indoor units 3, 5 and 7 is operated, the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 is converted into the liquid refrigerant of normal temperature and high pressure in the condenser 13, One of the evaporators A, B and C is connected via the first solenoid valve SV10 to one of the solenoid valves SV11, SV12 and SV13 and one of the capillaries C11, C12 and C13 connected thereto, ).

At this time, the bypass solenoid valve SY-BY is open.

However, in the conventional multi-combination type air conditioner as described above, there is a problem that the manufacturing cost is increased because only a small capacity indoor unit is installed to prevent the inflow of liquid refrigerant and control of the refrigerant amount during operation.

In addition, since the bypass pipe and the refrigerant distributing device are designed to be suitable for a multi-combination type air conditioner in which three wall-mounting indoor equipments are combined, in the multi-combination type air conditioner combining a large-capacity type air conditioner and a small- It is difficult to set the capillary length and the optimum cycle configuration.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a refrigeration system capable of improving the cooling capacity by appropriately supplying refrigerant to a plurality of indoor units having different capacities without using a receiver, And to provide a refrigerant control device for a multi-combination type air conditioner which can be used in a refrigeration cycle.

In order to achieve the above object, the present invention provides a multi-combination type air conditioner in which a large capacity indoor unit and first and second small capacity indoor units are connected to a single outdoor unit,

A compressor, a condenser, a refrigerant distribution unit, and an evaporator of each of the indoor units are sequentially installed to form a closed cycle, and a bypass unit is provided between an outlet of the condenser and an inlet of the compressor.

FIG. 1 is a schematic diagram of a conventional multi-combination type air conditioner. FIG.

Fig. 2 is a detailed diagram of a conventional multi-combination type air conditioner.

FIG. 3 is a schematic diagram of a multi-combination type air conditioner according to the present invention; FIG.

FIG. 4 is a detailed system diagram of a multi-combination type air conditioner according to the present invention; FIG.

5 to 11 are views showing the refrigerant flow according to the operating state of the indoor unit in the multi-combination type air conditioner according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

20: outdoor unit 22: compressor

24: condenser 26: refrigerant distributor

28: Bypass unit 30: Large capacity indoor unit

40: first low capacity indoor unit 50: second low capacity indoor unit

A: Evaporator of large capacity indoor unit B: Evaporator of the first small capacity indoor unit

C: Evaporator of the second low capacity indoor unit

SV1 to SV6: First to sixth solenoid valves

SV-BY: Bypass solenoid valve

C1 to C4: first to fourth capillaries C-BY: bypass capillary tube

3 is a schematic view of the multi-combination type air conditioner according to the present invention. The multi-combination type air conditioner according to the present invention is a multi-combination type air conditioner according to the present invention, in which one outdoor unit 20 is equipped with a large capacity indoor unit 30 of 20 equilibrium, Two small capacity indoor units 40 and 50 are connected, respectively.

4, the refrigerant control apparatus according to the present invention includes a compressor 22, a condenser 24, a refrigerant distribution unit 26, a large capacity indoor unit 30, first and second The bypass unit 28 is installed between the outlet of the condenser 24 and the inlet of the compressor 22 while the evaporators A, B and C of the small capacity indoor units 40, As shown in Fig.

The compressor 22 compresses the low temperature and low pressure gas refrigerant sucked from the evaporator A, B and C of the large capacity indoor unit 30 and the first and second small capacity indoor units 40 and 50 to generate high temperature and high pressure And the gas refrigerant is discharged to the condenser 24.

The condenser 24 is configured to cool the high temperature and high pressure gas refrigerant discharged from the compressor 22 and convert it into liquid refrigerant of room temperature and high pressure and discharge the refrigerant to the refrigerant distributor 26 and the bypass 28 .

The refrigerant distributor 26 selectively expands the liquid refrigerant of normal temperature and high pressure discharged from the condenser 22 into liquid refrigerant of low temperature and low pressure and supplies the liquid refrigerant of low temperature and low pressure to the large capacity indoor unit 30 And the evaporators A, B, and C of the first and second small capacity indoor units 40 and 50, respectively.

The bypass unit 28 bypasses the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 by the compressor 22 and supplies the refrigerant to the large capacity indoor unit 30 through the refrigerant distribution unit 26, And the amount of the low-temperature and low-pressure liquid refrigerant flowing into the evaporators (A, B, C) of the second small capacity indoor units (40, 50).

The refrigerant distributor 26 is connected to the inlet of the first to fourth valves SV1, SV2, SV3 and SV4 in common to the outlet of the condenser 24 and the first solenoid valve SV1, The inlet ports of the first and second solenoid valves SV5 and SV6 are connected to the outlet of the first capillary tube C1 and the outlet port of the first capillary tube C1, And the inlet ports of the second and third capillaries C2 and C3 are connected to the outlets of the fifth and sixth solenoid valves SV5 and SV6 respectively and the second and third capillaries C2 and C3 are connected, The evaporators C and B of the second and first small capacity indoor units 50 and 40 are connected to the outlet of the third solenoid valve SV3 while the inlet of the fourth capillary C4 is connected to the outlet of the third solenoid valve SV3, The evaporator A of the large-capacity indoor unit 30 is commonly connected to the fourth solenoid valve SV4 and the fourth capillary C4. The large capacity indoor unit 30 is connected to the capillary (Not shown) is incorporated.

The inlet of the bypass solenoid valve SV-BY is connected to the outlet of the condenser 24 and the outlet of the bypass solenoid valve SV-BY is connected to the outlet of the bypass solenoid valve SV- (C-BY), and an outlet of the bypass capillary (C-BY) is connected to an inlet of the compressor (22).

The operation of the liquid refrigerant control device of the multi-combination type air conditioner according to the present invention will be described in detail.

The high-temperature and high-pressure gas refrigerant discharged from the compressor 22 is converted into liquid refrigerant of normal temperature and high pressure in the condenser 24 and is supplied to the first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, do.

The first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, and SV6 are opened and closed by a controller (not shown) Low-pressure liquid refrigerant expanded through the first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, and SV6 and the first to fourth capillaries C1, C2, C3, Capacity indoor unit 30 and the first and second small capacity indoor units 40 and 50 in accordance with the operating states of the indoor unit 30 and the evaporators A, B and C of the first and second small capacity indoor units 40 and 50, And is appropriately supplied to the evaporator (A, B, C).

At this time, when only a small capacity indoor unit is operated, the liquid refrigerant of normal temperature and high pressure discharged from the condenser 24 is supplied to the bypass solenoid valve SV-BY and the bypass capillary C- BY to the compressor 22.

The refrigerant is supplied to the evaporator (A, B, C) of the large capacity indoor unit 30 and the first and second small capacity indoor units 40, 50 through the first to fourth capillaries C1, C2, Low temperature and low pressure liquid refrigerant is evaporated in the evaporator (A, B, C) of the large capacity indoor unit 30 and the first and second low capacity indoor units 40, 50 to be converted into low temperature and low pressure gas refrigerant The air temperature of the evaporators A, B and C of the first indoor unit 30 and the second indoor unit 40 is lowered by the heat of evaporation and the cooled air is supplied to the room by rotating the blowing motor .

The low temperature and low pressure gas refrigerant vaporized in the evaporator (A, B, C) of the large capacity indoor unit 30 and the first and second small capacity indoor units 40 and 50 as described above is sucked into the compressor 22, (22) to be compressed again into gas refrigerant of high temperature and high pressure.

At this time, the first to sixth solenoid valves SV1, SV2, SV3, SV4, SV5, and SV6 and the bypass solenoid valve SV-BY are controlled by a controller (not shown) do.

That is, when both the large-capacity indoor unit 30 having the capillary (not shown) and the first and second small capacity indoor units 40 and 50 are operated, as shown in FIG. 5, The high-temperature and high-pressure gas refrigerant in the high-capacity indoor unit 30 is cooled in the condenser 24 and converted into liquid refrigerant at room temperature and high pressure, and then is supplied to the evaporator A And the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is supplied to the first solenoid valve SV1 and the first capillary tube C1, the sixth solenoid valve SV6 and the third capillary tube C3 And the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 flows through the first solenoid valve SV1 and the first capillary tube C1, Is introduced into the evaporator (C) of the second small capacity indoor unit (50) through the fifth solenoid valve (SV5) and the second capillary tube (C2).

The low-temperature and low-pressure liquid refrigerant introduced into the evaporator (A, B, C) of the large-capacity indoor unit 30 and the first and second small capacity indoor units 40, 50, as described above, The refrigerant is evaporated in the evaporators A, B and C of the two small capacity indoor units 40 and 50 to be converted into low temperature and low pressure gas refrigerant and then sucked into the compressor 22 to be converted into high temperature and high pressure gas refrigerant It is compressed again.

When the large capacity indoor unit 30 and the first small capacity indoor unit 40 having the capillary tube (not shown) are operated simultaneously, as shown in FIG. 6, the high- The refrigerant is cooled in the condenser 24 and is then converted into liquid refrigerant at room temperature and high pressure and then introduced into the evaporator A of the large capacity indoor unit 30 through the fourth solenoid valve SV4, And then flows into the evaporator A of the large capacity indoor unit 30 through the fourth solenoid valve SV4 and the liquid refrigerant of room temperature and high pressure discharged from the condenser 24 Is introduced into the evaporator (B) of the first small capacity indoor unit (40) through the first solenoid valve (SV1), the first capillary (C1), the sixth solenoid valve (SV6) and the third capillary tube (C3).

The low-temperature and low-pressure liquid refrigerant introduced into the large-capacity indoor unit 30 and the evaporators A and B of the first small capacity indoor unit 40 as described above flows through the large capacity indoor unit 30 and the evaporator A , B) to be converted into low-temperature and low-pressure gas refrigerant, then sucked into the compressor (22) and compressed again by the compressor (22) into high temperature, high pressure gas refrigerant.

When the large capacity indoor unit 30 and the second small capacity indoor unit 50 each having a capillary tube (not shown) are operated simultaneously, as shown in FIG. 7, the high- The refrigerant is cooled in the condenser 24 and is then converted into liquid refrigerant at room temperature and high pressure and then introduced into the evaporator A of the large capacity indoor unit 30 through the fourth solenoid valve SV4 and discharged from the condenser 24 The liquid refrigerant at room temperature and high pressure is supplied to the first solenoid valve SV1 through the first capillary tube C1, the fifth solenoid valve SV5 and the second capillary tube C2, (C).

The low-temperature and low-pressure liquid refrigerant introduced into the evaporators A and C of the large-capacity indoor unit 30 and the second low-capacity indoor unit 50 as described above flows through the evaporator A And C, and is then converted into a low-temperature and low-pressure gas refrigerant, sucked into the compressor 22, and compressed again into a high-temperature, high-pressure gas refrigerant in the compressor 22.

When the first and second low capacity indoor units 40 and 50 are operated simultaneously, as shown in FIG. 8, the high-temperature, high-pressure gas refrigerant discharged from the compressor 22 is cooled in the condenser 24, The refrigerant is introduced into the evaporator B of the first small capacity indoor unit 40 through the second solenoid valve SV2, the sixth solenoid valve SV6 and the third capillary C3, And liquid refrigerant of normal temperature and high pressure discharged from the condenser 24 is supplied to the second small capacity indoor unit 50 through the second solenoid valve SV2, the fifth solenoid valve SV3, and the second capillary C2, Of the evaporator (C).

The low temperature and low pressure liquid refrigerant introduced into the evaporators B and C of the first and second small capacity indoor units 40 and 50 is supplied to the evaporators B and C of the first and second small capacity indoor units 40 and 50, And is then sucked into the compressor 22 and compressed again by the compressor 22 to the high-temperature, high-pressure gas refrigerant.

On the other hand, when the large-capacity indoor unit 30 having a capillary tube (not shown) is operated alone, the high-temperature and high-pressure gas refrigerant discharged from the compressor 22 is discharged from the condenser 24 And is then transferred to the evaporator (A) of the large-capacity indoor unit (30) through the fourth solenoid valve (SV4).

The low temperature and low pressure liquid refrigerant introduced into the evaporator A of the large capacity indoor unit 30 is evaporated in the evaporator A of the large capacity indoor unit 30 to be converted into low temperature and low pressure gas refrigerant, And is compressed again by the compressor 22 into the high-temperature, high-pressure gas refrigerant.

When the first low-capacity indoor unit 40 is operated alone, the high-temperature, high-pressure gas refrigerant discharged from the compressor 22 is cooled in the condenser 24 as shown in FIG. 10, And then flows into the evaporator B of the first small capacity indoor unit 40 through the second solenoid valve SV2, the sixth solenoid valve SV6 and the third capillary C3.

The low-temperature and low-pressure liquid refrigerant introduced into the evaporator (B) of the first low capacity indoor unit (40) is evaporated in the evaporator (B) of the first required quantity indoor unit (40) and converted into low temperature and low pressure gas refrigerant , The refrigerant is sucked into the compressor (22) and compressed again by the compressor (22) into a gas refrigerant of high temperature and high pressure.

At this time, a part of the liquid refrigerant of normal temperature and high pressure discharged from the condenser 24 flows into the compressor 22 through the bypass solenoid valve SV-BY and the bypass capillary C-BY. The liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is bypassed to the compressor 22 through the bypass solenoid valve SV-BY and the bypass capillary C-BY to cool the first small capacity indoor unit 40, The amount of liquid refrigerant flowing into the evaporator (B) of the evaporator can be controlled.

11, when the second low-capacity indoor unit 50 is operated alone, the high-temperature, high-pressure gas refrigerant discharged from the compressor 22 is cooled in the condenser 24, Refrigerant and then flows into the evaporator C of the second small capacity indoor unit 50 through the second solenoid valve SV2, the fifth solenoid valve SV5 and the second capillary C2.

The low-temperature and low-pressure liquid refrigerant introduced into the evaporator (C) by the second small capacity indoor unit (50) is evaporated in the evaporator (C) of the second low capacity indoor unit (50) and converted into low temperature and low pressure gas refrigerant , The refrigerant is sucked into the compressor (22) and compressed again by the compressor (22) into a gas refrigerant of high temperature and high pressure.

At this time, a part of the liquid refrigerant of normal temperature and high pressure discharged from the condenser 24 flows into the compressor 22 through the bypass solenoid valve SV-BY and the bypass capillary C-BY. The liquid refrigerant of room temperature and high pressure discharged from the condenser 24 is bypassed to the compressor 22 through the bypass solenoid valve SV-BY and the bypass capillary C-BY to cool the second small capacity indoor unit 50 The amount of liquid refrigerant flowing into the evaporator C of the evaporator can be controlled.

As described above, according to the present invention, it is possible not only to improve the cooling capacity by appropriately supplying the refrigerant to a plurality of indoor units having different capacities without using the receiver, but also to perform cooling appropriate to the size of the room.

In the present invention, three indoor units, that is, one large capacity indoor unit of 20 equilibrium and two small capacity indoor units of 7 equilibrium are connected to one outdoor unit. However, the present invention is not limited to this and the capacity of the large capacity indoor unit is not limited to that of the remaining two small capacity indoor units It is applicable when the capacity is larger than the combined capacity.

Claims (9)

In a multi-combination type air conditioner in which a large-capacity indoor unit and a first and a second small capacity indoor unit are connected to one outdoor unit, a compressor, a condenser, a refrigerant distribution unit, and an evaporator of each indoor unit are sequentially installed to form a closed cycle And a bypass unit is provided between an outlet of the condenser and an inlet of the compressor. The refrigerant distributing unit is connected to the outlet of the first to fourth solenoid valves in common to the outlet of the condenser, An inlet port of the first capillary tube is connected to an outlet port of the valve, an inlet port of the fifth and sixth solenoid valves are commonly connected to an outlet port of the second solenoid valve and the first capillary tube, The second and third capillary tubes are respectively connected to the outlets of the second and third capillaries, and the second and third capillary tubes are connected to the outlets of the second and third capillaries, The evaporator of the indoor unit is connected to the outlet of the third solenoid valve, the inlet of the fourth capillary is connected to the outlet of the third solenoid valve, the evaporator of the large capacity indoor unit is commonly connected to the fourth solenoid valve and the fourth capillary, Wherein the capillary tube has a capillary structure. The bypass capillary tube according to claim 1, wherein the bypass portion has an inlet port of a bypass solenoid valve connected to an outlet port of the condenser, an inlet port of a bypass capillary tube is connected to an outlet port of the bypass solenoid valve, Is connected to the inlet of the compressor. The air conditioner according to claim 2, wherein when the large-capacity indoor unit and the first and second small capacity indoor units are operated, the first solenoid valve, the third solenoid valve, the fifth solenoid valve and the sixth solenoid valve are opened And the refrigerant is supplied to the outdoor unit. 3. The multi-combination type air conditioner according to claim 2, wherein the first solenoid valve, the fourth solenoid valve, and the sixth solenoid valve are opened when the large capacity indoor unit and the first small capacity indoor unit operate simultaneously Refrigerant control device. 3. The multi-combination type air conditioner according to claim 2, wherein the first solenoid valve, the fourth solenoid valve, and the fifth solenoid valve are opened when the large capacity indoor unit and the second small capacity indoor unit operate simultaneously Refrigerant control device. 3. The air conditioner according to claim 2, wherein when the first and second small capacity indoor units are operated simultaneously, the second solenoid valve, the fifth solenoid valve and the sixth solenoid valve are opened, controller. 3. The refrigerant control device of the multi-combination type air conditioner according to claim 2, wherein when the large capacity indoor unit is operated alone, the fourth solenoid valve is opened. The air conditioner according to claim 2, wherein when the first small capacity indoor unit is operated alone, a second solenoid valve, a sixth solenoid valve, and a bypass solenoid valve are opened. Device. The air conditioner according to claim 2, wherein when the second small capacity indoor unit is operated alone, a second solenoid valve, a fifth solenoid valve, and a bypass solenoid valve are opened. Device.