KR100621182B1 - Air conditioner - Google Patents

Abstract

The present invention relates to an air conditioner capable of stably maintaining a proper oil level of oil contained in a plurality of compressors, comprising: a plurality of compressors arranged in parallel; An oil discharge pipe installed in each of the plurality of compressors to discharge excess oil to the outside; A capillary tube connected to the oil discharge tube; It is connected to the capillary tube, and is configured to include a fungal oil tube for selectively supplying the excess oil discharged to the outside through the oil discharge pipe to the plurality of compressors. Accordingly, not only the oil level of each compressor can be easily secured, but also the homogeneous oil structure is simple, and assemblability can be improved.

Compressor, oil drainage tube, oil, capillary tube, homogenizing line

Description

Air Conditioner {AIR CONDITIONER}

1 is a configuration diagram partially showing the structure of an air conditioner according to the present invention,

Figure 2 is a block diagram showing the flow of oil during the sole operation of the compressor in the air conditioner according to the present invention,

Figure 3 is a block diagram showing the flow of oil during the simultaneous operation of the compressor in the air conditioner according to the present invention.

            <Description of Symbols for Main Parts of Drawings>

          20a: first compressor 20b: second compressor

          30a: 1st oil discharge pipe 30b: 2nd oil discharge pipe

          40a: capillary 1 40b: capillary 2

          50: fungal oil pipe 60a: the first accumulator

          60b: second accumulator 70: oil separator

          80 condenser

The present invention relates to an air conditioner, and more particularly, to an air conditioner capable of stably maintaining a proper oil level of oil contained in a plurality of compressors.

In general, an air conditioner is a device that cools or heats through an endothermic and exothermic action generated by vaporization or liquefaction while a refrigerant circulates a refrigeration cycle composed of a compressor, a condenser, an expansion valve, and an evaporator.

Recently, a separate type air conditioner having a plurality of compressors has been introduced to properly adjust the capacity of a compressor in response to a change in the cooling capacity of an indoor space. That is, only one compressor is driven when a relatively small cooling capacity is required because the indoor / outdoor temperature difference is not large, and a plurality of compressors are driven when a large cooling capacity is required to maintain a large or low indoor temperature. This is to increase the efficiency of the air conditioner.

In particular, when an amount of oil is imbalanced in an air conditioner in which a plurality of compressors are connected in parallel, not only the operation of each compressor may be stable but may also cause damage to the compressor. Therefore, in order to secure the reliability of each compressor according to the change of the compression conditions, it is necessary to control the amount of oil in each compressor that changes according to the operating conditions to secure the appropriate oil level.

Conventionally, an air conditioner equipped with a plurality of compressors, as known in Korean Patent Laid-Open Publication No. 2003-0075197, based on a temperature difference detected by first and second temperature sensors installed on the upper and lower sides of the pressure reducer, the oil in each compressor. After detecting the amount, the on / off valve is selectively turned on / off to supply oil through the oil pipe so as to maintain an appropriate oil level. In addition to this, a number of technologies for the oil conditioner of the air conditioner have been disclosed.

However, the air conditioner having the above structure has a problem that the control method is complicated as well as the homogeneous oil structure for stably maintaining the oil proper oil level of the plurality of compressors.

Therefore, there is a disadvantage in that a large amount of economic costs such as parts and installation costs are required.

The present invention has been made to solve the above problems, and an object thereof is to provide an air conditioner capable of stably securing the oil proper oil level of a plurality of compressors.

In order to achieve the above object, the present invention provides a plurality of compressors arranged in parallel; An oil discharge pipe installed in each of the plurality of compressors to discharge excess oil to the outside; A capillary tube connected to the oil discharge tube; It is characterized in that it is connected to the capillary tube, comprising a fungal oil tube for selectively supplying the excess oil discharged to the outside through the oil discharge pipe to the plurality of compressors.

The fungal oil pipe is preferably branched to be interconnected with the plurality of compressors.

The oil discharge pipe is preferably installed near the oil titration surface of each of the plurality of compressors.

Accumulators are connected to each of the plurality of compressors, and the fungal oil pipe is preferably supplied to the accumulator with excess oil discharged to the outside through the oil discharge pipe.

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

As shown in Figures 1 to 3, the air conditioner according to the present invention and the first and second compressors (20a, 20b); First and second oil discharge pipes 30a and 30b installed in each of the first and second compressors 20a and 20b to discharge excess oil to the outside; First and second capillary tubes 40a and 40b connected to the first and second oil discharge pipes 30a and 30b; It is connected to the first and second capillary tubes 40a and 40b to selectively supply excess oil discharged to the outside through the first and second oil discharge pipes 30a and 30b to the first and second compressors 20a and 20b. It is configured to include a fungal oil pipe (50).

The first and second compressors 20a and 20b are arranged in parallel with different cooling capacities, and serve to compress the refrigerant introduced from the evaporator (not shown) to a high pressure. Discharge pipes 10 for discharging the compressed refrigerant are installed above the first and second compressors 20a and 20b, and the refrigerant discharged through the discharge pipes 10 passes through the oil separator 70 to condenser ( 80).

The first and second accumulators 20a and 20b are connected to the first and second accumulators 60a and 60b, respectively, so that the liquid refrigerant and the gas refrigerant introduced into the interior through the refrigerant pipe 12 can be separated from each other. have.

The oil separator 70 is installed in communication with the discharge pipe 10 and the refrigerant pipe 12 to separate the oil discharged together in the refrigerant discharge process from the first and second compressors 20a and 20b. Resupply to compressors 20a and 20b.

The first and second oil discharge pipes 30a and 30b are installed near the proper oil level of the oil contained in each of the first and second compressors 20a and 20b to discharge the excess oil when the excess oil is generated. .

The fungal oil pipe 50 directly supplies the surplus oil generated in any one of the first and second compressors 20a and 20b to the other in which the amount of refrigerant discharge is relatively large, thereby directly supplying the first and second compressors 20a and 20b. Make sure that the amount of oil in the tank maintains the proper oil level. The fungal milk pipe 50 is formed with a branch point 50a to be connected to the first and second compressors 20a and 20b, and the arrangement structure of the fungal milk pipe 50 can be variously changed as necessary.

The fungal oil pipe 50 supplies the excess oil discharged to the outside through the first and second oil discharge pipes 30a and 30b directly to the first and second compressors 20a and 20b, or the first and second accumulators 60a and 60b) is supplied to the 1st, 2nd compressor 20a, 20b.

The first and second capillaries 40a and 40b have to obtain the diameter and length of the first and second capillaries 40a and 40b according to the first and second compressors 20a and 20b, which can be obtained through experiments. For example, the diameters of the first and second capillaries 40a and 40b are small and long so that the flow resistance is large so that the oil does not flow properly. If the flow resistance is small, the high pressure refrigerant and the oil flow too much, which may affect the performance of the fungal oil system. Because it can.

Hereinafter, the flow of oil according to two compressor operating conditions will be briefly described with reference to FIGS. 2 and 3.

First, in a single operation in which only one of the first and second compressors 20a and 20b is operated, as shown in FIG. 2, the excess oil generated in the first compressor 20a during the operation is the first oil discharge pipe ( It is discharged to the outside through 30a), and the discharged oil flows through the first capillary tube 40a along the fungal oil tube 50.

When the oil flowing along the fungal oil pipe 50 reaches the branch point 50a of the fungal milk pipe 50, it is connected to the first compressor 20a during operation by the pressure difference between the first and second compressors 20a and 20b. By supplying to the first accumulator 60a, the oil supply to the first compressor 20a during operation is made stable, thereby ensuring the proper oil level of the oil.

When the first and second compressors 20a and 20b are operated simultaneously (when the capacity of the first compressor is larger than that of the second compressor), as shown in FIG. 3, the first compressor having a relatively large amount of oil discharge. The oil 20a is difficult to secure proper oil level only with the oil recovered from the oil separator 70 (see FIG. 1), while excess oil is generated in the second compressor 20b having a small oil discharge amount. At this time, the excess oil is discharged to the outside through the oil discharge pipe (30b), the discharged oil flows along the fungal oil pipe (50) via the second capillary pipe (40b). When the oil flowing along the bacteria oil pipe 50 reaches the branch point 50a of the bacteria oil pipe 50, the oil is discharged to the first compressor 20a having a large amount of oil discharge due to the pressure difference between the first and second compressors 20a and 20b. By supplying to the first accumulator 60a which is connected, the proper oil level of each of the first and second compressors 20a and 20b can be secured.

When all the excess oil is transferred from the second compressor 20b having a small amount of oil discharge to the first compressor 20a, the proper oil level of the oil is maintained in the second compressor 20b, so that the high temperature along the fungal oil pipe 50 is maintained. Only high pressure refrigerant gas flows. The refrigerant gas flows only below the amount defined by the capillary tube 40b.

In the above, only the homogeneous structure of the air conditioner in which the two compressors are arranged in parallel has been described. However, this is only an example, and the present invention may be applied to an air conditioner having a plurality of compressors arranged in parallel. Of course.

As described above, according to the present invention, it is relatively easy to secure the oil level of each of the plurality of compressors, and the homogeneous oil structure is simple to improve the assemblability.

In addition, by supplying excess oil directly to the compressor with a lot of oil loss, it is possible to shorten the time according to the fungal oil.

Claims (4)

A plurality of compressors arranged in parallel and having different cooling capacities; An oil discharge pipe installed in each of the plurality of compressors to discharge excess oil to the outside; A capillary tube connected to the oil discharge tube; And a fungal oil pipe connected to the capillary tube to selectively supply excess oil discharged to the outside through the oil discharge pipe to the plurality of compressors based on a pressure difference of the compressor. The method of claim 1, The fungus pipe is branched to be formed to interconnect with the plurality of compressors. The method according to claim 1 or 2, The oil discharge pipe is an air conditioner, characterized in that installed near the oil proper oil level of each of the plurality of compressors. The method of claim 1, An accumulator is connected to each of the plurality of compressors, and the fungal oil pipe is configured to supply the accumulator with excess oil discharged to the outside through the oil discharge pipe.

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