KR100805966B1 - Shared receiver for air conditioner with multi compressors - Google Patents

Abstract

A shared receiver for an air conditioner with multiple compressors is provided to reach a pressure balance state in a compression chamber of a suspended compressor by forming an oil trap between a suction part of the compressor and a shared receiver to block introduction of low pressure from the shared receiver to the suction part of the compressor, instead of using any additional control unit. A shared receiver for an air conditioner with multiple compressors includes a receiver housing(120) having a space for receiving liquid refrigerant, and gas refrigerant, and oil, a suction pipe(122) mounted in the center of the top part of the receiver housing. Discharge pipes(124) are provided at both sides of the suction pipe for discharging the gas refrigerant upward, wherein the discharge pipes are formed in the U-shape for oil trap when the compressors are suspended. An oil recovery pipe(126) is mounted at the lower part of the receiver housing to send oil to the compressors.

Description

SHARE RECEIVER FOR AIR CONDITIONER WITH MULTI COMPRESSORS}

1 is a configuration diagram of an air conditioner having two conventional compressors.

2 is a block diagram of an air conditioner having two compressors according to the present invention.

3 is an enlarged partial view of a portion “A” of FIG. 2 enlarged.

** Explanation of symbols for main parts of the drawing **

100: air conditioner, 110a, 110b: compressor,

120 receiver housing, 122 suction tube,

124: discharge pipe, 126: oil recovery pipe,

128: oil recovery connector, 130: condenser,

140: expansion valve, 150: evaporator,

150a, 150b: inlet pipe, 170a, 170b: accumulator.

The present invention relates to an air conditioner, and more particularly, by using at least two or more compressors to be able to vary the cooling capacity according to the cooling load to improve the oil equal distribution and stop compressor restartability proportional to the refrigerant circulation. The present invention relates to a common receiver for an air conditioner having a plurality of compressors.

An air conditioner is a device that controls air temperature, humidity, air flow, and cleanliness to create a comfortable indoor environment. Recently, two compressors are provided in an outdoor unit to effectively respond to the required refrigeration capacity. An air conditioner with two compressors is used.

1 is a configuration diagram of an air conditioner having two conventional compressors.

As illustrated, the conventional air conditioner 10 includes two compressors 20a and 20b and an outlet tube for guiding compressed gas refrigerant provided in each of the compressors 20a and 20b. 21a and 21b, and oil separators 22a and 22b provided at the ends of the outlet pipes 21a and 21b to separate the gas refrigerant and the oil flowing out from the compressor, and the gas passing through the oil separators 22a and 22b. A connecting pipe 23 for guiding the refrigerant to circulate through the condenser 30, the expansion valve 40, and the evaporator 50 by combining the refrigerant, and the refrigerant passing through the evaporator 50 to each compressor. It is provided on the inlet pipe (24a, 24b) branched from the connecting pipe to be branched inlet, and each of the inlet pipe (24a, 24b) is provided to store the excess refrigerant generated according to the operating capacity of each compressor (20a, 20b) It is connected to the accumulators 60a and 60b, the oil separators 22a and 22b and the inlet pipes 24a and 24b, and hangs in the oil separators 22a and 22b. Capillary tubes 25a and 25b for guiding the oil to the inlet pipes 24a and 24b and dropping the pressure, and the outlet pipes 21a and 21b and the inlet pipes 24a and 24b of the compressors 20a and 20b. It includes a control device (not shown) for controlling the pressure balance by using a solenoid valve (Solenoid Valve).

In the air conditioner, the air conditioner sends the high temperature and high pressure refrigerant from the compressor located at the outdoor side to the condenser, condenses it to medium temperature and high pressure, expands the low temperature low pressure refrigerant in the expansion valve, and then moves to the evaporator. At this time, the evaporator located in the indoor side absorbs the heat from the indoor side and is sent to the accumulator in the outdoor side and then sent to the compressor to compress the cooling process.

In addition, when it is to be operated at the same time or independently due to the change in indoor cooling load, the stopped compressor must be restarted to switch the operation. To this end, the inside of the compression chamber of the compressor is to maintain the pressure balance, in this case, the discharge and suction pipes of the compressor to control the pressure balance using a control device such as a solenoid valve.

In addition, the accumulator has a refrigerant accommodating space inside the accumulator in the mixed refrigerant of gas and liquid from the evaporator so that only the gas refrigerant flows into the suction side of each compressor and supplies oil proportional to the refrigerant intake of each compressor. Do this.

However, in the conventional air conditioner, when one of the two compressors is selectively operated, and the stationary compressor is to be operated to meet the cooling load, the suction unit of the compressor is commonly used. There was a problem that the pressure imbalance occurs inside the compression chamber of the restart is not good.

In order to solve this problem, the discharge and suction pipes of the compressor are controlled through a solenoid valve and the like, and in this case, an additional control device is required to cause a cost increase.

In addition, when the compressor is selectively operated by the cooling load, the accumulator sucks the refrigerant from the upper portion and discharges the refrigerant to the lower portion, so that the oil stored in the lower portion of the accumulator flows into the stationary compressor through the oil return hole, causing oil dropping. There was a problem that occurred.

In addition, in order to balance the high pressure in the compressor housing with the low pressure on the suction side, the compressor stopped after the operation flows into the low pressure side of the accumulator. At this time, the oil inside the compressor housing flows into the accumulator to operate. Inflow to the compressor side, there was a problem that the oil pull phenomenon occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and restarts the compressor stopped for pressure equalization, so that the inside of the compression chamber of the stopped compressor can reach the pressure balance state in a short time and the common receiver can be reached. The purpose is to achieve cost savings by constructing an oil trap in between to block the inflow of low pressure from the common receiver to the compressor suction side without a separate control device.

In addition, another object of the present invention is to form a different discharge structure of the refrigerant and the oil in the common receiver for supplying oil proportional to the refrigerant intake amount to prevent damage to the compressor due to the oil pull phenomenon to improve the reliability of the product It is.

In addition, another object of the present invention is to place the common receiver on the suction side of the accumulator front end of the compressor so that oil dropping phenomenon does not occur in the common receiver.

In order to solve the above technical problem, a receiver for an air conditioner having a plurality of compressors according to the present invention, which includes at least two compressors having different capacities, forms a receiver for forming one air conditioning cycle. An air conditioner provided, comprising: a receiver housing having a space for accommodating liquid refrigerant, gas refrigerant, and oil therein; A suction pipe provided at a central portion of an upper side of the receiver housing; A discharge tube provided to discharge gas refrigerant to an upper side in both directions with a center of the suction tube; And an oil return pipe provided at a lower portion of the receiver housing so as to send oil to each compressor. Characterized in that it comprises a.

In addition, the discharge tube may be formed in a “U” shape to allow an oil trap, and the lower surface OP of the discharge tube may be lower than the portion OT where the receiver housing and the oil recovery tube are in contact with each other. .

In addition, an oil suction hole is formed at the upper end of the oil return pipe so as to suck the oil contained in the housing.

In addition, the lower side of the discharge pipe and the oil recovery pipe is provided with an oil recovery connection pipe to be connected to each other to be communicated.

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

FIG. 2 is a configuration diagram of an air conditioner having two compressors according to the present invention, and FIG. 3 is an enlarged partial view of the "A" part of FIG.

As shown, the receiver for an air conditioner 100 having a plurality of compressors according to the present invention comprises at least two compressors 110a and 110b having different capacities to form one air conditioning cycle. An air conditioner having a receiver comprising: a receiver housing having a space for accommodating a liquid refrigerant, a gas refrigerant, and an oil therein; A suction pipe 122 provided at an upper center portion of the receiver housing 120; A discharge tube 124 provided to discharge gas refrigerant to the upper side in both directions with the center of the suction tube 122 in the upper direction; And an oil return pipe 126 provided at a lower portion of the receiver housing 120 so as to send oil to the respective compressors 110a and 110b. Characterized in that it comprises a.

That is, the present invention is provided with at least two compressors (110a, 110b) having different capacities that can be operated independently according to the indoor load conditions to form one air conditioning cycle.

In addition, the refrigerant is circulated to the condenser 130, the expansion valve 140, and the evaporator 150, and the connection pipe 160 is provided to provide the refrigerant to the condenser 130, the expansion valve 140, and the evaporator 150. To be guided to the receiver housing 120.

In addition, the inlet pipes 150a and 150b branched from the connecting pipe are provided so that the refrigerant passing through the evaporator 150 is branched into each compressor.

In addition, the accumulators 170a and 170b provided on the respective inlet pipes 150a and 150b may store the excess refrigerant generated according to the operating capacity of the compressors 110a and 110b. At this time, the high pressure in the compressor housing generated by the compressor stopped after operation forms a pressure equilibrium with the low pressure of the compressor suction side, and the receiver housing 120 is moved to the compressor 110 to prevent the oil from occurring due to the oil being drawn toward the suction side. It is preferable to prevent the oil from pulling up to the receiver housing by being configured to be located at the suction side of the front end of the accumulators 170a and 170b.

On the other hand, the inside of the receiver housing 120 to separate the low-pressure gas refrigerant, the liquid refrigerant and oil supplied from the evaporator 150 to be stored. At this time, the suction pipe 122 is provided in the central portion of the upper side of the receiver housing 120 to suck the gas refrigerant, liquid refrigerant and oil from the evaporator 150 side.

Then, the discharge pipe 124 is provided in both directions around the suction pipe 122 provided on the upper side of the receiver housing 120 to discharge the gas refrigerant to the upper side. The discharge pipe 124 is formed in a "U" shape so that the oil trap (Oil Trap) when the compressor is stopped. At this time, the lower surface OP of the discharge pipe 124 is preferably formed to be located lower than the portion (OT) in contact with the receiver housing 120 and the oil recovery pipe 126. This is to reduce the pressure balance time of the stopped compressor.

That is, the low pressure liquid refrigerant, gas refrigerant and oil flowing from the evaporator 150 are introduced into the receiver housing 120 through the suction pipe 122 provided at the upper side of the receiver housing 120. In the receiver housing 120, the gas refrigerant rises to the upper side and flows into the compressors 110a and 110b through the discharge pipe 124, and the liquid refrigerant and the oil sink to the lower side, and the liquid refrigerant rises to the upper side due to the density difference. Always be rearranged to the bottom of the discharge tube (124). According to this structure, the oil supply to the operation compressor can be smoothly implemented by implementing the discharge structure of the refrigerant and the oil separately in the receiver housing 120 to supply the oil in proportion to the refrigerant intake amount. In addition, it is possible to prevent the damage of the compressor due to the oil pulled by blocking the inflow of oil into the stationary compressor.

In addition, when operating simultaneously or independently due to indoor cooling load fluctuations, the suction side and the receiver of the compressor can reach the pressure equilibrium state within the compression chamber of the stopped compressor for a smooth restart. By installing an oil trap between the housings 120, it is possible to achieve the pressure balance of the compressor by blocking the inflow from the receiver housing 120 to the compressor suction side without providing a separate control device.

In addition, the oil return pipe 126 is provided in the lower portion of the receiver housing 120, and separates the liquid refrigerant and the oil by the density difference, and then flows into the compressor which operates only the oil by the principle of Venturi tube. It would be possible. Of course, the oil suction hole 126a is formed at the upper end of the oil return pipe 126 so as to suck the oil contained in the receiver housing 120 so that only oil can be introduced into the compressor to operate. Supply is possible.

In addition, the oil recovery connecting pipe 128 is provided so that the lower side of the discharge pipe 124 and the oil recovery pipe 126 can communicate with the oil to be discharged to the outside of the receiver housing 120.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

According to the receiver for an air conditioner having a plurality of compressors according to the present invention as described above, it is shared with the suction side of the compressor without a separate control unit so that the inside of the compression chamber of the stationary compressor can be reached in a pressure equilibrium state in a short time. An oil trap is formed between the receivers, thereby reducing the inflow of low pressure from the common receiver to the compressor suction side, thereby achieving a pressure balance, thereby achieving cost reduction.

In addition, another effect of the present invention is to form a different discharge structure of the refrigerant and the oil in the common receiver for supplying the oil proportional to the refrigerant intake amount to prevent damage to the compressor due to the oil pull phenomenon to improve the reliability of the product will be.

In addition, another effect of the present invention is that the common receiver is located on the suction side of the accumulator front end of the compressor so that oil dropping does not occur in the shared receiver.

Claims (4)

In an air conditioner having a receiver having at least two compressors having different capacities to form one air conditioning cycle, A receiver housing having a space for accommodating liquid refrigerant, gas refrigerant, and oil therein; A suction pipe provided at a central portion of an upper side of the receiver housing; A discharge tube provided to discharge gas refrigerant to an upper side in both directions toward the center of the suction tube; And An oil return pipe provided at a lower portion of the receiver housing so as to send oil to each compressor; Common receiver for an air conditioner having a plurality of compressors comprising a. The method of claim 1, The discharge pipe is formed in a “U” shape, and the lower surface OP of the discharge pipe is formed so as to be positioned lower than the portion OT where the receiver housing and the oil recovery pipe contact each other. Common receiver for harmonics. The method of claim 1, An air receiver for an air conditioner having a plurality of compressors, wherein an oil suction hole is provided at an upper end of the oil return pipe to suck oil contained in the receiver housing. The method of claim 1, And an oil recovery connecting pipe provided to communicate with the lower side of the discharge pipe and the oil recovery pipe.

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