KR20000019552A - Device for distributing and expanding refrigerants for multiple air conditioner - Google Patents

Abstract

PURPOSE: A device is provided to easily perform the vacuum process of a refrigerant line, the leakage inspection of gas and the filling process of refrigerants. CONSTITUTION: An outdoor unit of an air conditioner is composed of: an outdoor heat exchanger(23) provided on the outlet of a compressor(21) installed inside of an outdoor unit(11); a drier(25) connected to the refrigerant outlet of the outdoor heat exchanger to remove vapor included in refrigerants; and a ventilator arranged on the side of the outdoor heat exchanger to improve the heat exchanging efficiency by forcibly circulating air. The refrigerants passing the outdoor heat exchanger are expanded by passing a sixth capillary tube(61) after a seventh electronic valve(63) to prevent refrigerant liquid from being introduced into the compressor.

Description

Refrigerant Distribution Expansion Device of Multi Air Conditioner

The present invention relates to a multi air conditioner, and more particularly, to a refrigerant distribution expansion device coupled between an outdoor unit and an indoor unit of a multi air conditioner.

In general, an air conditioner installed with one indoor unit having one indoor heat exchanger corresponding to one outdoor unit having one outdoor heat exchanger can be cooled / heated in only one indoor space. There is a problem in that air conditioners must be installed for each indoor space.

In consideration of this point, a plurality of indoor units are installed to correspond to one outdoor unit to develop a multi-air conditioner for cooling / heating a plurality of indoor spaces.

The multi-air conditioner cools / heats a plurality of indoor spaces by combining one outdoor unit and a plurality of indoor units, and a refrigerant distribution expansion device for distributing and expanding a refrigerant by a plurality of capillaries and solenoid valves between the indoor unit and the outdoor unit. Expose the refrigerant from the outdoor unit to distribute to each indoor unit to expand.

These air conditioners are used a lot because they can cool / heat a large number of indoor spaces by combining various types of general detachable indoor units according to indoor spaces to be cooled / heated, thereby improving the compatibility of indoor units and reducing development costs. have.

On the other hand, moisture in the refrigerant cycle causes various failures, and thus, in order to prevent the failure, moisture in the refrigerant line is removed, gas leakage test is performed, and the refrigerant is charged in the refrigerant line. By vaporizing the water in the refrigerant cycle is removed.

In order to perform the vacuum operation, the gas leakage inspection and the refrigerant charging operation, conventionally, a pipe is welded to the refrigerant line before entering the refrigerant distribution expansion device from the high pressure side of the refrigerant, that is, the outdoor unit, and coupled to the end of the pipe. After loosening the nipple and performing the vacuum operation, the end of the pipe was welded to maintain the airtightness of the refrigerant line.

By the way, the welding work of the pipes for the conventional vacuum work, the welding of the end of the pipe to maintain the airtight after the refrigerant charge work is carried out in a narrow space, the operation is easy due to the solenoid valve of the refrigerant distribution expansion device. There was a problem that can not.

In addition, when it is necessary to perform vacuum work again due to the trouble of the refrigerant line, the welded pipe is cut off and welded to the pipe with a new nipple, and then vacuum work has been performed.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a refrigerant distribution expansion device for a multi-air cone that can facilitate the vacuum operation and the gas leakage inspection and refrigerant charging operation of the refrigerant line.

1 is a system diagram showing a multi-air conditioner to which the refrigerant distribution expansion device of the present invention is applied;

Figure 2 is a perspective view showing the heat exchanger portion in the air conditioner outdoor unit to which the refrigerant distribution expansion device of the present invention is coupled.

<Explanation of symbols for the main parts of the drawings>

21 compressor 23 outdoor heat exchanger

25: dryer 35: main expansion means

37; Auxiliary expansion means 65; Service valve

67: connector

The refrigerant distribution expansion device for a multi-air conditioner according to the present invention comprises a plurality of capillary tubes for cooling / heating a plurality of indoor spaces by combining one outdoor unit and a plurality of indoor units, and distributing and expanding a refrigerant between the indoor unit and the outdoor unit. In the refrigerant distribution expansion device of the multi-air cone provided with the solenoid valve, the inlet side of the refrigerant distribution expansion device is characterized in that the service valve is coupled to facilitate the vacuum operation of the refrigerant line.

A coupler is coupled to the outlet side of the service valve so that the connecting pipe is hermetically connected.

Preferably, the refrigerant distribution expansion device includes main expansion means and auxiliary expansion means having different capillary lengths so as to vary the degree of expansion of the refrigerant according to the capacity of the indoor unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a structure in which three indoor units are combined will be described as an example.

As shown in Fig. 1, the outdoor unit 11 having one outdoor heat exchanger and the three first, second and third indoor rooms 13, 15 and 17 each having one indoor heat exchanger distribute refrigerant. It is connected by a refrigerant pipe with a refrigerant distribution expansion device 19 interposed therebetween.

The outdoor unit 11 has an outdoor heat exchanger 23 connected to the discharge port side of the compressor 21 installed therein, and a dryer 25 to remove moisture contained in the refrigerant at the refrigerant outlet side of the outdoor heat exchanger 23. Is connected to one side of the outdoor heat exchanger (23) has a structure in which a blower (not shown) is arranged to increase the heat exchange efficiency by forced convection of air.

The outdoor heat exchanger 23 has three refrigerant inlets and four refrigerant outlets, and the refrigerant outlets formed on the uppermost side of the four refrigerant outlets prevent refrigerant overfill due to the small operation capacity of the indoor unit. Bypass expansion means 27 is connected to expand the refrigerant so as not to flow into the compressor 21 to bypass the refrigerant inlet of the compressor 21.

At this time, the three refrigerant inlets of the outdoor heat exchanger 23 are connected to the outlet of the compressor 21 by a refrigerant pipe, and the three refrigerant outlets of the outdoor heat exchanger 23 are the dryer by a refrigerant pipe. It is connected to the inlet of (25). Therefore, the refrigerant discharged from the compressor 21 branches in three directions and flows in through three refrigerant inlets of the outdoor heat exchanger 23, and the refrigerant passing through the outdoor heat exchanger 23 has three refrigerant outlets. After flowing out through it gathers and flows into the dryer 25.

The said 1st, 2nd, 3rd indoor chamber 13, 15, 17 is equipped with the 1st, 2nd, 3rd indoor heat exchanger 29, 31, 33, respectively.

The refrigerant distribution expansion device (19) is a structure in which a plurality of capillary tubes and solenoid valves are connected in series / parallel, and main expansion means (35) having different capillary lengths so as to vary the degree of expansion of the refrigerant according to the capacity of the indoor unit. And auxiliary expansion means (37).

The main expansion means (35) is a first capillary (39) is disposed to expand the refrigerant flowing into the first indoor heat exchanger (29) from the dryer 25, the refrigerant flowing into the first capillary (39) A first solenoid valve 41 is connected in series with the first capillary tube 39 to shut off / distribute the second, and a second electron in parallel with the first capillary tube 39 and the first solenoid valve 41. A valve 43 is connected, and a second capillary tube 45 is disposed to expand the refrigerant flowing into the second and third indoor heat exchangers 31 and 33 from the dryer 25, and the second capillary tube is disposed. A third solenoid valve 47 is connected to the second capillary tube 45 in series with the second capillary tube 45 to block / flow the refrigerant flowing to the second capillary tube 45, and to the second capillary tube 45 and the third solenoid valve 47. The fourth solenoid valve 49 is connected in parallel with each other.

The auxiliary expansion means 37 is a third capillary tube so as to expand the refrigerant flowing into the first indoor heat exchanger 29 from the first capillary tube 39 or the second solenoid valve 43 of the main expansion unit 35. The first capillary 51 is disposed to expand the refrigerant flowing into the second indoor heat exchanger 31 from the second capillary tube 45 or the fourth solenoid valve 49 of the main expansion part 35. 53, the fifth solenoid valve 55 is connected in series with the fourth capillary tube 53 to block / flow the refrigerant flowing into the fourth capillary tube 53, and the main expansion part 35 The fifth capillary tube 57 is disposed so as to expand the refrigerant flowing into the third indoor heat exchanger 33 from the second capillary tube 45 or the fourth solenoid valve 49. The sixth solenoid valve 59 is connected to the fifth capillary tube 57 in series so as to block / flow the refrigerant flowing therethrough.

The bypass capturing means 27 is provided with a sixth capillary tube 61 to expand the refrigerant bypassed from the refrigerant outlet side of the outdoor heat exchanger 23 to the refrigerant inlet side of the compressor 21. The seventh solenoid valve 63 is connected in series with the sixth capillary tube 61 to block / flow the refrigerant flowing through the capillary tube 61.

The service valve 65 is coupled to the inlet side of the main expansion means 35, that is, the place past the dryer 25 to facilitate the vacuum operation of the refrigerant line. The service valve 65 is a general on-off valve and is coupled to the branch pipe 66 branched from the refrigerant line.

The connector 67 is coupled to the outlet side of the service valve 65 so as to hermetically connect a connection pipe for vacuum operation or the like.

2 shows an actual perspective view in which an outdoor heat exchanger 23 is connected to the compressor 19 of the present invention, and a refrigerant distribution expansion device 19 is coupled to the outdoor heat exchanger 23 via a dryer 25. .

As shown, the service valve 65 is coupled to the inlet of the main expansion means 35 of the refrigerant distribution expansion device 19.

When the vacuum operation is performed, the service valve 67 is opened, and a vacuum generating means such as a vacuum pump is coupled through the connecting port 67 to vacuum the inside of the refrigerant pipe to remove moisture in the pipeline. When it is completed, if the service valve 65 is locked, the vacuum work is completed without any after work.

In the air conditioner having a plurality of indoor units according to the embodiment of the present invention configured as described above, during the cooling operation, the refrigerant gas of the high temperature and high pressure discharged from the compressor 21 as indicated by arrows in FIG. 1 is subjected to outdoor heat exchange. After entering into the apparatus 23 and cooling and condensing, it is heat-exchanged with the outdoor air. The liquefied high-pressure refrigerant passes through the dryer 23 to remove moisture contained therein, and then the refrigerant distribution expansion device 19 According to the opening and closing of the plurality of solenoid valves provided therein, the liquid is divided into a plurality of capillaries and converted into a low pressure refrigerant liquid by the adiabatic expansion effect of the capillary tube. 17 are introduced into each indoor heat exchanger (29, 31, 33), the refrigerant liquid in each of the indoor heat exchangers (29, 31, 33) is evaporated and exchanged with the indoor air to be converted into refrigerant gas, the refrigerant Gas is back It is introduced into the open compressor 21 to air-conditioning for each room space, the indoor unit yirumyeonseo a cycle that converts to the refrigerant gas of high temperature and high pressure by the compressor 21 is installed at the same time.

At this time, by controlling the solenoid valve provided in the refrigerant distribution expansion device 19 by a control means (not shown), the refrigerant flowing into each indoor unit can be controlled to variously cool the indoor space.

Hereinafter, a method of controlling the refrigerant distribution expansion device 19 for each combination of indoor units operating in accordance with the indoor space to be cooled will be described.

If the first, second, third rooms 13, 15, 17 are to be operated simultaneously, the first, third, fifth, and sixth solenoid valves 41, 47, 55, 59 are opened, and the second And the fourth and seventh solenoid valves 43, 49, and 63 are closed.

Accordingly, the refrigerant passing through the dryer 25 expands while passing through the first solenoid valve 41 and passes through the first capillary tube 39, and passes the second capillary tube 45 past the third solenoid valve 47. Inflate while passing. The refrigerant passing through the first capillary tube 39 expands again while passing through the third capillary tube 51, enters the first indoor heat exchanger 29 of the first chamber 13, and exchanges heat with air. After passing through the fourth capillary tube 53, the refrigerant passing through the capillary tube 45 expands again through the fourth capillary tube 53, and then flows into the second indoor heat exchanger 31 of the second chamber 15 to provide air and air. The refrigerant passing through the second capillary tube 45 at the same time as the heat exchanger is expanded again while passing through the fifth capillary tube 57 through the sixth solenoid valve 59, and then the third chamber heat exchanger 33 of the third chamber 17. As it enters the heat exchanger and heat exchanges with the air, the indoor space in which the first, second, and third indoor rooms 13, 15, and 17 are disposed is cooled. At this time, the refrigerant passing through the outdoor heat exchanger 23 does not bypass the refrigerant inlet of the compressor 21.

If only the first chamber 13 and the second chamber 15 are to be operated at the same time, the second, third, and fifth solenoid valves 43, 47, 55 are opened, and the first, fourth, sixth, 7 The solenoid valves 41, 49, 59, 63 are closed.

Therefore, the refrigerant passing through the dryer 25 expands while passing through the second solenoid valve 43 and passes through the second capillary tube 45 through the third solenoid valve 47. The refrigerant passing through the second solenoid valve 43 expands while passing through the third capillary tube 51, enters the first indoor heat exchanger 29 of the first chamber 13, and exchanges heat with air. After passing through the fourth capillary tube 53, the refrigerant passing through the capillary tube 45 expands again through the fourth capillary tube 53, and then flows into the second indoor heat exchanger 31 of the second chamber 15 to provide air and air. As the heat is exchanged, the indoor space in which the first and second indoor units 13 and 15 are disposed is cooled. At this time, the refrigerant passing through the outdoor heat exchanger 23 is not bypassed to the refrigerant inlet of the compressor 21.

Even when the first indoor unit 13 and the third indoor unit 17 operate in combination, or the second indoor unit 15 and the third indoor unit 17 operate in combination, an appropriate solenoid valve can be opened and operated.

If only the second indoor unit 15 is to be operated, the third, fourth, fifth and seventh solenoid valves 47, 49, 55 and 63 are opened and the first, second and sixth solenoid valves 41, 43, 59) close.

Therefore, the refrigerant passing through the drier 25 expands while passing through the second capillary tube 45 through the third solenoid valve 47 and passes through the fourth solenoid valve 49. After the refrigerant passing through the second capillary tube 45 and the fourth solenoid valve 49 collects and expands while passing through the fourth capillary tube 53 through the fifth solenoid valve 55, the second chamber 15 is disposed. As the second indoor heat exchanger 31 enters and exchanges heat with air, the indoor space in which the second indoor unit 15 is disposed is cooled. At this time, the refrigerant passing through the outdoor heat exchanger 23 expands through the sixth capillary tube 61 after passing through the seventh solenoid valve 63 and then bypasses the refrigerant inlet of the compressor 21 to the refrigerant pipe. It prevents the refrigerant overcharge and the refrigerant liquid flows into the compressor (21).

When only the first indoor unit 13 or the third indoor unit 17 is to be operated, an appropriate solenoid valve can be opened and operated.

As described above, by controlling the respective solenoid valves of the refrigerant distribution expansion device 19, it is possible to control the various first, second, third rooms 13, 15, 17, the service valve 65 By opening and closing the valve, a vacuum operation can be facilitated.

According to the multi-cone refrigerant distribution expansion device according to the present invention, the vacuum operation of the refrigerant line, the gas leakage inspection and the refrigerant charging operation, opening the service valve to perform the vacuum operation, etc. When the vacuum operation is completed, the operation is simply completed because the operation is completed. In addition, the trouble of the refrigerant line can be easily solved regardless of the solenoid valve for distributing the refrigerant.

Claims (3)

By combining one outdoor unit and a plurality of indoor units, a plurality of indoor spaces are cooled / heated, and a plurality of capillaries and solenoid valves are provided to expand and distribute the refrigerant between the indoor unit and the outdoor unit. In the apparatus, Refrigerant distribution expansion device for a multi-air cone, characterized in that the service valve is coupled to the inlet side of the refrigerant distribution expansion device to facilitate the vacuum operation of the refrigerant line. The method of claim 1, Refrigerant distribution expansion device for a multi-air cone, characterized in that the connector is coupled to the outlet side of the service valve so that the connection pipe is hermetically connected. The method of claim 1, The refrigerant distribution expansion device is a refrigerant distribution expansion device for a multi-air cone, characterized in that the main expansion means and the auxiliary expansion means are different from each other in the length of the capillary tube to vary the degree of expansion of the refrigerant in accordance with the capacity of the indoor unit.