KR100389555B1 - Cooling circuit of multi-air conditioner using capillary tube - Google Patents

Abstract

The present invention provides a refrigerant circuit of a multi-type air conditioner using a capillary tube to realize improved performance while realizing a simple structure by applying a capillary tube as a refrigerant expansion means of the multi-type air conditioner to adjust the flow rate of the refrigerant.

To this end, the present invention is a refrigerant circuit of a multi-type air conditioner in which a single outdoor unit is connected to a plurality of indoor units respectively installed in a plurality of rooms, and a compressor for compressing a refrigerant in a gas state to a high pressure to convert it into a liquid state, and the compressor. 4-way valve for controlling the flow of the refrigerant passing through, a condenser for converting the refrigerant in the gas state passed through the 4-way valve to the liquid state, the valve is opened and closed according to the cooling operation state of each room from the condenser A plurality of capillaries to adjust the flow rate for the refrigerant in the liquid state, and the evaporator to convert the refrigerant passing through the plurality of capillaries into the gas state to absorb the latent heat of the surroundings.

Description

Cooling circuit of multi-air conditioner using capillary tube

The present invention relates to a refrigerant circuit of a multi-type air conditioner using a capillary tube, and more particularly, to apply a capillary tube to a multi-type air conditioner having a plurality of indoor units to a single outdoor unit, thereby simplifying the structure of the refrigerant circuit and improving the cooling capability of the improved performance. It relates to a refrigerant circuit of a multi-type air conditioner using a capillary tube to allow runaway.

In general, air conditioners employed to cool various interiors of buildings or houses to a proper temperature have a centralized type of air conditioning depending on aspects of energy saving, convenience of design and construction, and diversification of office environment. As the individual distributed method is being replaced, a multi-type air conditioner has been developed and commercialized to connect a plurality of indoor units allocated to each room to a single outdoor unit as such individual distributed method.

Unlike the general air conditioner equipped with a single outdoor unit and an indoor unit, the multi-type air conditioner can easily control the overall system including the control of the refrigerant flow rate and the heat exchange amount control according to the connection status of the indoor unit assigned to each room. It is designed to be.

On the other hand, in such a multi-type air conditioner, when the capacity is set in consideration of the maximum load on the indoor units provided in each room as a whole, all the indoor units are operated to cool all the rooms, and only a part of the indoor units are partially operated. When cooling the bay, the flow rate of the refrigerant is adjusted to change the capacity to cope with the load fluctuation.

In order to adjust the flow rate of the refrigerant, in the multi-type air conditioner, an electronic expansion bar that adjusts the flow rate of the refrigerant by adjusting the opening and closing degree of the orifice located between the needle and the cylinder according to the number of pulses of the step motor is applied as the expansion device.

However, the electronic expansion valve applied as the expansion device of the multi-type air conditioner has a complicated configuration for controlling the opening and closing of the valve and the configuration of the related electronic circuits, so that maintenance must be frequently performed, and expensive installation and maintenance costs are required. This takes a disadvantage.

Accordingly, the present invention has been made to solve the above-mentioned disadvantages, and its object is to apply a capillary tube as a refrigerant expansion means of a multi-type air conditioner to adjust the flow rate of the refrigerant, thereby achieving improved performance while realizing a simple structure. It is to provide a refrigerant circuit of a multi-type air conditioner using a capillary tube.

It is another object of the present invention to apply a capillary tube as a refrigerant expansion means of a multi-type air conditioner, and by installing a bypass means made of a capillary tube on the compression means side of the refrigerant, thereby realizing a simple structure, It is to provide a refrigerant circuit of a multi-type air conditioner using a capillary tube to adjust the amount of circulation.

1 is a view showing the configuration of a refrigerant circuit of a multi-type air conditioner using a capillary tube according to an embodiment of the present invention;

2 is a view showing the configuration of a refrigerant circuit of a multi-type air conditioner using a capillary tube according to another embodiment of the present invention.

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

2a, 2b: evaporator, 4: 4-way valve,

6: accumulator, 8: compressor,

12: condenser, 16: cooling fan,

18: receiver, 20a to 20e, 24: capillary tube,

22a to 22d, 26: valve.

According to an embodiment of the present invention to achieve the above object, in the refrigerant circuit of the multi-type air conditioner in which a single outdoor unit is connected to a plurality of indoor units respectively installed in a plurality of rooms, converting a refrigerant in a gas state into a liquid state. Compressor compressed to high pressure, a four-way valve for controlling the flow of refrigerant through the compressor, a condenser for converting the refrigerant in the gas state through the four-way valve into a liquid state, the cooling operation state of each room Capillary tube consisting of a plurality of capillaries for adjusting the flow rate of the liquid refrigerant from the condenser by opening and closing the valve, and an evaporator to convert the refrigerant passing through the plurality of capillaries into a gas state to absorb the latent heat of the surroundings It provides a refrigerant circuit of the multi-type air conditioner using.

In addition, according to another embodiment of the present invention to achieve the above object, in the refrigerant circuit of a multi-type air conditioner in which a single outdoor unit is connected to indoor units each installed in a plurality of rooms having different sizes of spaces, The flow rate of the refrigerant is controlled by opening and closing the valve according to a selective cooling operation state in a room having a different size of space installed between the compressor for compressing the refrigerant to a high pressure to convert the refrigerant into a liquid state. Bypass capillary for bypass control, 4-way valve for controlling the flow of refrigerant passing through the compressor, condenser for converting the refrigerant in the gas state through the 4-way valve to the liquid state, cooling each room A plurality of capillaries and phases for adjusting the flow rate to the liquid refrigerant from the condenser by opening and closing the valve in accordance with the operating state, It provides a refrigerant circuit of a multi-type air conditioner using a capillary tube composed of an evaporator converting the refrigerant passing through a plurality of capillaries into a gas state to absorb the latent heat of the surroundings.

According to the present invention configured as described above, by applying a capillary tube having a low cost and simple structure in place of the electronic expansion valve in the refrigerant circuit of the multi-type air conditioner, the capillary tube according to the cooling operation state of each room where a plurality of indoor units are installed By properly adjusting the flow rate of the refrigerant flowing through the refrigerant circuit, there is no need for additional maintenance, it is possible to retain the cooling capacity of the improved performance even by a capillary tube of low price.

Hereinafter, an embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, Figure 1 is a view showing the configuration of a refrigerant circuit of a multi-type air conditioner using a capillary tube according to an embodiment of the present invention.

As illustrated in FIG. 1, the refrigerant circuit according to an embodiment of the present invention is a multi-type air conditioner so that two indoor units respectively installed in a single outdoor unit and two indoor units may be connected to a single outdoor unit, and each indoor space. The case where the sizes of are the same as will be described as an example.

In the figure, the refrigerant circuit of the present invention includes a plurality of evaporators (2a, 2b; evaporators), a four-way valve (4; 4-way valve), an accumulator (6; accumulator), a compressor (compressor); , Filter 10, condenser 12, condenser 12, fan motor 14, cooling fan 16, receiver 18 (dryer), capillary tube 20a-20e, capillary valve 22a 22d).

The plurality of evaporators 2a and 2b are independently installed in two rooms, and evaporate the liquid refrigerant passing through the plurality of capillaries 20a to 20e and the valves 22a to 22d in a gaseous state. The cooling operation is performed by taking away the latent heat of evaporation in the room, and the four-way valve 4 is for switching the flow of the refrigerant during the cooling or heating operation.

The compressor 8 increases the pressure to change the gaseous refrigerant passing through the accumulator 6 into the liquid state, and the condenser 12 is rotated by the fan motor 14 of the outdoor unit. The latent heat is discharged to the outside through the cooling fan 16 to change the refrigerant from the gas state to the liquid state.

The first and second capillaries 20a and 20b of the plurality of capillaries 20a to 20e are connected in parallel to the receiver 18, and the third and fourth capillaries 20c and 20d are connected to each other in parallel. Among the plurality of valves 22a to 22d, the third capillary tube 20c is connected to both ends of the first valve 22a, and the fourth capillary tube 20d is connected to both ends of the second valve 22b. The five capillary tube 20e is connected between the connection site | part of the 1st valve 22a and the 3rd valve 22c, and the connection site | part of the 2nd valve 22b and the 4th valve 22d.

Here, the plurality of capillary tubes 20a to 20e are in the open / closed state of the valves 22a to 22d in order to allow both rooms to cool or to partially cool one room. Accordingly, the refrigerant flow rate is adjusted to expand the refrigerant converted into the liquid state from the condenser 4 through the receiver 18.

On the other hand, the plurality of capillary tubes (20a to 20e) is the length and the inner diameter is determined by the amount of refrigerant determined from the cooling capacity according to the size of the indoor space, the total refrigerant flow rate of the refrigerant circuit is 0.0333Kg / S When the flow rate supplied to one indoor unit is 0.01427Kg / S and the flow rate supplied to the other indoor unit is 0.01903Kg / S, the length of the first capillary tube 20a is 1 meter (m) and the second capillary tube 20b ) Length is 0.5 meters, the length of the third capillary tube (20c) is 1.2 meters, the length of the fourth capillary tube (20d) is 0.9 meters, the length of the fifth capillary tube (20e) is 0.9 meters to be installed and installed, It is preferable that the inner diameters of the many capillaries 20a to 20e be commonly manufactured to 1.5 millimeters (mm).

According to the present invention, when the refrigerant circuit is initially driven, the plurality of valves 22a to 22d are opened and closed at the same time in consideration of the safety of the system, thereby ensuring the safety of the compressor 8 while ensuring a smooth flow of cold water. It is intended to plan.

Next, the operation of the present invention made as described above will be described in detail with reference to FIG.

First, in a state in which two indoor units respectively installed in two rooms are connected to a single outdoor unit, a plurality of evaporators 2a and 2b installed in each indoor unit change the refrigerant into a gaseous state. The latent heat is taken away to perform cooling.

In that state, the gaseous refrigerant passing through the plurality of evaporators 2a, 2b is compressed by the compressor 8 via the four-way valve 4 and the accumulator 6, and the filter 10 And the condenser 12 through the 4-way valve 4.

The condenser 12 converts the refrigerant compressed to high pressure by the compressor 8 into a liquid refrigerant while discharging latent heat to the outside through the cooling fan 16 which is rotationally driven by the fan motor 16. The refrigerant converted into the liquid state by the condenser 12 passes through the capillaries 20a to 20e through the receiver 18.

The plurality of capillary tubes 20a to 20e may be used to selectively open or close both of the two rooms or to partially open or close the plurality of valves 22a to 22d according to an operation of partially cooling only one room. As a result, the flow rate of the refrigerant can be adjusted.

Meanwhile, the refrigerant passing through the plurality of capillaries 20a to 20e is converted into a gaseous refrigerant while passing through the plurality of evaporators 2a and 2b to perform a cooling operation.

Next, another embodiment of the present invention will be described in detail with reference to the accompanying drawings.

That is, FIG. 2 is a view showing a configuration of a refrigerant circuit of a multi-type air conditioner using a capillary tube according to another embodiment of the present invention, and for components that are substantially similar to the configuration according to an embodiment of the present invention shown in FIG. While the same reference numerals, detailed description thereof will be omitted.

In another embodiment of the present invention as shown in FIG. 2, a case where a single outdoor unit is connected to two indoor units respectively installed in two rooms is described as an example, but the size of each indoor space is different from one example. It will be described as.

In the same figure, in another embodiment of the present invention, a bypass means consisting of a capillary tube 24 and a valve 26 for bypassing the refrigerant between the front and rear ends of the compressor 8 is connected. It is for preventing the difference in flow rates between the two indoor spaces when the sole operation is performed only for cooling a large indoor space and when the single operation is performed only for cooling a small indoor space.

That is, the bypass means consisting of the capillary tube 24 and the valve 26, when driven alone to cool only one indoor space, all the refrigerant is excessively concentrated in any one room while the system is overloaded In order to prevent an increase in power consumption and deterioration of the reliability of the compressor 8, a flow rate of about 20% is bypassed among the flow rates of the refrigerant passing through the compressor 8.

Herein, when the flow rate of the refrigerant passing through the refrigerant circuit is 0.0462 Kg / S, the capillary tube 24 determines the inner diameter of 1 millimeter (mm), and the length thereof is 1.2 meter (m). desirable.

It is a matter of course that the present invention having the above-described embodiments can be embodied in various modifications without departing from the spirit and scope of the embodiments.

As described above, according to the present invention, by employing a capillary tube without applying a conventional solenoid valve as an expansion device to a refrigerant circuit of a multi-type air conditioner, the refrigerant flow rate is increased due to the pressure drop generated by the difference in the inner diameter and the length of the capillary tube. By being able to be adjusted, it is possible to have a cooling capacity of the same performance or improved performance as a conventional electronic expansion valve while employing a capillary tube having a low cost and simple structure, and the separate structure of the capillary tube The effect is that it becomes unnecessary.

Claims (2)

In order to convert a gaseous refrigerant into a liquid state, a compressor is compressed to a high pressure, a four-way valve that regulates the flow of the refrigerant passing through the compressor, and a gaseous refrigerant that has passed through the four-way valve into a liquid state. In the refrigerant circuit of the multi-type air conditioner comprising a condenser for converting, a plurality of evaporators for converting the refrigerant into a gas state to absorb the latent heat of the surroundings, a single outdoor unit is connected to a plurality of indoor units respectively installed in a plurality of rooms, A plurality of capillaries installed between the condenser and the plurality of evaporators to adjust the flow rate of the refrigerant in the liquid state from the condenser; Refrigerant circuit of the multi-type air conditioner using a capillary tube, characterized in that it is provided between the plurality of capillaries, each of the valves for performing a valve operation for adjusting the flow rate for the refrigerant in the liquid state through each capillary tube. In order to convert a gaseous refrigerant into a liquid state, a compressor is compressed to a high pressure, a four-way valve that regulates the flow of the refrigerant passing through the compressor, and a gaseous refrigerant that has passed through the four-way valve into a liquid state. A condenser for converting and a plurality of evaporators for converting the refrigerant into a gaseous state to absorb latent heat of the surroundings, and a refrigerant of a multi-type air conditioner in which a single outdoor unit is connected to indoor units respectively installed in a plurality of rooms having different sizes of spaces. In the circuit, A bypass capillary tube installed between the front and rear ends of the compressor to open and close a valve according to a selective cooling operation state of a room having a different size of a space, thereby bypassing and controlling the flow rate of the refrigerant; A plurality of capillaries installed between the condenser and the plurality of evaporators to adjust the flow rate of the refrigerant in the liquid state from the condenser; Refrigerant circuit of the multi-type air conditioner using a capillary tube, characterized in that it is provided between the plurality of capillaries, each of the valves for performing a valve operation for adjusting the flow rate for the refrigerant in the liquid state through each capillary tube.