KR20020069660A - accumulator structure in the air conditioner - Google Patents

Abstract

PURPOSE: Structure of an accumulator for an air conditioner is provided to improve the reliability of a compressor by delaying the rising of the level of a liquid refrigerant in an accumulator. CONSTITUTION: An accumulator for an air conditioner includes a shell(110), and a discharge pipe(130). A refrigerant discharged from an evaporator flows into the shell through an inlet pipe(120) and suspends therein. The part of the discharge pipe placed in the shell is bent in the U shape. Many intake holes(133a) are formed in the discharge pipe to suck the liquid refrigerant. A gaseous refrigerant inlet port(131a) is placed in the upper inner portion of the shell. Through the gaseous refrigerant inlet port, the gaseous refrigerant flows in. A bent portion(132) having an oil recovery hole(132a) and placed in the lower inner portion of the shell is formed in the discharge pipe. According to the suction holes, the liquid refrigerant is expanded and sucked. Therefore, the level of the liquid refrigerant is prevented from approaching the gaseous refrigerant inlet port.

Description

Accumulator structure in the air conditioner

The present invention relates to an air conditioner, and more particularly, to improve the structure of the accumulator and to delay the increase of the level of the liquid refrigerant inside the accumulator, thereby ensuring the stability of the compressor.

A general air conditioner is divided into a heat pump having cooling and heating functions, and an air conditioner having only cooling functions.

In addition, the air conditioner is divided into a general heat pump and air conditioner having one indoor unit in one outdoor unit, and a multi heat pump and multi air conditioner having a plurality of indoor units in one outdoor unit.

The configuration and operation of such a multi-air conditioner will be described with reference to FIG. 1 as follows.

1 is a block diagram showing the configuration of a conventional multi-air conditioner and a flow of a refrigerant. Referring to this, the outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an accumulator 100, and the like. 20 consists of an indoor heat exchanger 21 and an expansion valve 22.

First, when the air conditioner is cooling, the outdoor heat exchanger 12 of the outdoor unit 10 serves as a condenser for condensing the high temperature / high pressure gaseous refrigerant fed from the compressor 11.

The refrigerant condensed as described above is expanded to a low-temperature / low-pressure gas while passing through the expansion valve 22 and is sent to the indoor heat exchanger 21.

Subsequently, as the refrigerant of the indoor heat exchanger 21 is exchanged with the indoor air, the refrigerant of the indoor heat exchanger 21 is changed into a two-phase refrigerant in which a gaseous state and a liquid state of low temperature / low pressure are mixed.

After the refrigerant passes through the accumulator 100, the refrigerant is sent back to the compressor 11 to form one cycle of the refrigerant.

This air conditioner cooling action is the same as the cooling action of the heat pump will be omitted below.

Next, the heating action of the heat pump is opposite to that of the refrigerant and the heat exchanger as compared with the cooling action of the heat pump.

That is, the refrigerant compressed by the compressor 11 is an indoor heat exchanger 21. Expansion valve (22) Accumulator (100) Flow in the order of the outdoor heat exchanger (12).

At this time, the indoor heat exchanger 21 serves as a condenser for heat exchange between the high temperature and high pressure refrigerant passing through the inside and the indoor air, and the outdoor heat exchanger 12 exchanges the low temperature and low pressure refrigerant and the outdoor air therein. It acts as an evaporator.

In this process, since the frost is generated by heat exchange with the low temperature and humid air of the surroundings, the outdoor heat exchanger 12 performs defrosting operation to reverse the flow of the refrigerant to remove the frost.

That is, when the defrosting operation is performed, the refrigerant is the compressor 11. Outdoor Heat Exchanger (12) Expansion valve (22) The indoor heat exchanger 21 flows in this order.

When the defrosting operation is finished, the heating operation of the heat pump is started again so that the refrigerant is in the compressor (11). Indoor Heat Exchanger (21) Expansion valve (22) Outdoor Heat Exchanger (12) It flows in the order of the accumulator 100.

Meanwhile, the accumulator 100 prevents liquid refrigerant from flowing into the compressor 11 and sends only gaseous refrigerant to the compressor 11 among refrigerants that have completed one cycle.

The structure and operation of the accumulator will be described with reference to FIG. 2 as follows.

FIG. 2 is a cross-sectional view illustrating a structure of the accumulator of FIG. 1 and a state of the refrigerant in the shell. Referring to this, the accumulator 100 communicates with the shell 110 in which an inner space is formed and the inner space of the shell 110. It consists of an inlet pipe 120 and the discharge pipe 130.

The inlet pipe 120 penetrates the upper portion of the shell 110 and is fixed so that its end faces the bottom surface of the shell 110.

In addition, the discharge pipe 130 is formed to have a "∪" shape, the bent portion 132, the oil recovery hole 132a is formed, and extends from one side of the bent portion 132, the gas refrigerant inlet ( It consists of an inlet 131 having a 131a, and the discharge portion 133 extending from the other side of the bent portion 132 to face the inlet 131.

In the discharge tube 130 having such a shape, the gas refrigerant inlet 131a is disposed at an upper portion of the inner space of the shell 110, and the bent portion 132 is disposed at a lower portion of the inner space of the shell 110.

On the other hand, the refrigerant of the evaporator heat exchanged with the indoor air is introduced into the shell 110 through the inlet pipe 120, this refrigerant is located in the liquid state in the lower portion of the inner space of the shell 110, the inner space of the shell 110 Located at the top of each of the gaseous state is separated.

On the other hand, oil is supplied to an apparatus installed inside the compressor 11 to compress the refrigerant, and this oil is recovered by an oil separator (not shown) in the compressor 11.

Even so, because not all oil is filtered by the oil separator, a small amount of unfiltered oil reaches the accumulator 100 after circulating the entire system in a state of being mixed with the refrigerant.

At this time, the oil having a relatively high density is mixed with the refrigerant in the liquid state to be located under the accumulator 100.

As described above, since the gas refrigerant inlet 131a is positioned above the inner space of the shell 110, the gas refrigerant inlet 131a sucks the refrigerant in a gaseous state, and the bent portion 132 in which the oil recovery hole 132a is formed is the shell 110. Because it is located in the lower part of the inner space, it will suck the liquid refrigerant mixed with oil.

The pressure P in the discharge tube 130 is the pressure in the inner space of the shell 110 Since it is lower, the liquid refrigerant passing through the oil recovery hole 132a is expanded while being sucked.

In this way, all the refrigerant in the discharge pipe 130 is sent to the compressor 11 in a gaseous state, and at the same time, the oil in the inner space of the shell 110 is also sent to the compressor 11.

On the other hand, the flow rate of the refrigerant to the accumulator 100 shows a large difference according to the number of the indoor unit 20 in which the multi air conditioner or the multi heat pump is operated.

For example, when only one indoor unit 20 is operated among the plurality of indoor units 20 of the multi-air conditioner, a large amount of liquid refrigerant is present in the accumulator 100, so that the level of the liquid refrigerant is high. Will be on.

At this time, when the level of the liquid refrigerant is higher than the height (H) of the gas refrigerant inlet 131a, the liquid refrigerant may be introduced into the gas refrigerant inlet 131a and the liquid refrigerant may be sent to the compressor 11.

In addition, in the case of the multi-heat pump, the flow of the refrigerant is reversed in the process of performing the defrosting operation to remove the frost generated in the outdoor heat exchanger 12 and then heating again.

At this time, the liquid refrigerant may be introduced into the compressor 11 of the multi heat pump.

As described above, when the liquid refrigerant is sent to the compressor 11 as described above.

First, the operating current of the compressor 11 suddenly rises, and thus the compressor 11 cannot be stably operated, which causes a significant increase in the noise of the compressor 11.

In addition, when more liquid refrigerant is introduced into the compressor 11, since the oil in the compressor 11 is diluted by the liquid refrigerant, the compression part of the compressor 11 is worn out and burnout occurs in the compressor 11. Problems arise.

The present invention has been made to solve the above problems, and its object is to ensure the reliability of the compressor by delaying the increase of the level of the liquid refrigerant in the accumulator inner space.

1 is a block diagram showing the configuration of a conventional multi-air conditioner and the flow of refrigerant.

FIG. 2 is a cross-sectional view illustrating a structure of the accumulator of FIG. 1 and a state of a coolant inside the shell; FIG.

Figure 3 is a cross-sectional view showing the structure of the accumulator and the state of the refrigerant inside the shell according to the present invention.

Figure 4 is a state cross-sectional view showing another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: outdoor unit 11: compressor

12: outdoor heat exchanger 20: indoor unit

21: indoor heat exchanger 22: expansion valve

100: accumulator 110: shell

120: inlet tube 130: discharge tube

131: inlet 131a: gas refrigerant inlet

132: bend portion 132a: oil recovery hole

133: discharge part 133a: suction hole

In order to achieve the above object, the present invention includes a shell in which the refrigerant discharged from the evaporator is introduced through the inlet pipe and the refrigerant accumulates therein; The inside of the shell has a shape bent in the shape of "과" and at the same time a plurality of suction holes are formed to suck the liquid refrigerant, and the gas refrigerant inlet, which is the end thereof, is located in the upper part of the inner space of the shell so that the gas refrigerant is The present invention relates to an accumulator structure for an air conditioner including a discharge pipe having a bent portion which is introduced into a lower portion of a shell inner space and has an oil return hole formed therein.

Since the accumulator structure for the air conditioner according to the present invention is almost similar to the conventional art, the same parts are given the same reference number, and the description thereof will be omitted.

Hereinafter, an accumulator structure for an air conditioner according to the present invention will be described with reference to FIGS. 3 and 4.

Figure 3 is a cross-sectional view showing the structure of the accumulator and the state of the refrigerant in the shell according to the present invention.

Referring to FIG. 3, the accumulator 100 for an air conditioner includes a shell 110 in which refrigerant introduced through an inlet pipe 120 is temporarily stored, and a shell 110 so as to communicate with an inner space of the shell 110. It consists of an inlet pipe 120 and the discharge pipe 130 is fixed to.

A portion of the discharge tube 130 positioned inside the shell 110 has a shape bent with a "∪" and a plurality of suction holes 133a are formed.

The discharge tube 130 has a bent portion 132, an inlet portion 131 having a gas coolant inlet 131a extending from one side of the bent portion 132 and opened, and the other side of the bent portion 132. The discharge unit 133 extends from the opposite side to the inlet 131.

An oil recovery hole 132a is formed in the bent portion 132, and is located below the shell 110, and the gas coolant inlet 131a of the inlet 131 is disposed above the shell 110. Located.

When the water level (H) of the liquid refrigerant reaches the gas coolant inlet (131a) of the discharge pipe 130, as shown in Figure 3 the suction hole (hole) in the discharge pipe 130 portion of the lower level (H) 133a) is preferably formed.

This is because if the liquid refrigerant level is formed higher than the height (H) of the gas refrigerant inlet (131a) from the bottom of the shell 110, the liquid refrigerant is sucked through the gas refrigerant inlet (131a) to the liquid state to the compressor (11) This is because the coolant is supplied.

In addition, the suction hole 133a formed in the discharge tube 130 portion below the water level H has a predetermined interval in the longitudinal direction of the discharge tube 130 and a plurality of suction holes on the circumference of each interval ( 133a).

This is to change the amount of the liquid refrigerant sucked through the suction hole 133a according to the level of the liquid refrigerant formed in the shell 110.

That is, as the level of the liquid refrigerant rises, the suction holes 133a which are immersed in the liquid refrigerant increase, so that more liquid refrigerant can be expanded to the gas state and sent to the compressor 11.

4 is a cross-sectional view illustrating a state in which another embodiment of the present invention is referred to, the gaseous refrigerant sucked into the gas refrigerant inlet 131a of the discharge tube 130 is an inlet 131 and a bent portion 132. And the discharge part 133 are sequentially passed to the compressor 11.

In this process, the flow rate of the gas refrigerant is increased from the gas refrigerant inlet 131a toward the discharge part 133.

Since the flow velocity and the pressure of the refrigerant are inversely related, the pressure in the discharge tube 130 is lowered toward the discharge portion 133 from the gas refrigerant inlet 131a.

That is, as shown in Figure 4 the pressure is Are in a relationship.

Accordingly, in order to change the liquid refrigerant sucked into the discharge tube 130 into a gas state by the pressure difference between the discharge tube 130 and the inside of the shell 110, a plurality of suction holes are provided in the discharge unit 133. It is more preferable to form 133a.

In addition, the suction hole 133a formed in the discharge part 133 has a predetermined interval in the longitudinal direction of the discharge tube 130 and has a plurality of suction holes 133a on the circumference of each interval.

Since the suction holes 133a are formed at predetermined intervals for the same reason as described above, they will be omitted below.

As described above, by forming a plurality of suction holes 133a in the discharge tube 130 of the accumulator 100, it is possible to delay the level of the liquid refrigerant from reaching the gas refrigerant inlet 131a of the discharge tube 130. Can be.

In addition, the refrigerant in the liquid state can be sucked while expanding through the suction hole 133a, so that more gas refrigerant can be supplied to the compressor 11.

In this way, the liquid refrigerant to the compressor 11 can be prevented from flowing in, thereby ensuring the stability of the compressor 11 for the multi-air conditioner.

In addition, when the multi-heat pump is switched to the heating operation after the defrosting operation, the inflow of the liquid refrigerant into the compressor 11 can be prevented.

As described above, the operation of the compressor can be made stable and the efficiency of the air conditioner or the heat pump can be improved.

As described above, the present invention can delay the increase of the level of the liquid refrigerant in the accumulator internal space.

Accordingly, it is possible to prevent the liquid refrigerant from being compressed in the compressor, thereby reducing the noise generated when the liquid refrigerant is compressed, thereby achieving high quality of the multi-air conditioner and the multi-heat pump.

In addition, it is possible to ensure the safety of the compressor by stabilizing the operating current of the compressor.

Claims (4)

A shell into which the refrigerant discharged from the evaporator flows through the inlet pipe and the refrigerant accumulates therein; The inside of the shell has a shape bent in the shape of "∪" and at the same time a plurality of suction holes are formed to inhale while expanding the liquid refrigerant, the end of the gas refrigerant inlet is located in the upper portion of the shell inner space gas An accumulator structure for an air conditioner including a discharge pipe having a coolant introduced therein, and a discharge pipe formed at a lower portion of a shell inner space and having an oil return hole formed therein. The method of claim 1, The discharge pipe is an accumulator structure for an air conditioner, characterized in that the suction hole is formed only in the lower portion of the liquid refrigerant when the liquid refrigerant reaches the gas refrigerant inlet. The method of claim 2, The discharge pipe is an accumulator structure for the air conditioner, characterized in that the suction hole is formed only in the discharge portion extending from the bent portion to the discharge side of the refrigerant. The method of claim 2 or 3, The discharge tube has a predetermined interval along the longitudinal direction of the discharge tube and at the same time a plurality of suction holes formed on the circumference of each interval accumulator structure for air conditioners.