KR20020029140A - System of Anti-Inflow of Liquid working fluid in Direct Cooling Type Refrigerator - Google Patents

Abstract

PURPOSE: A system for preventing inflow of fluid refrigerant of direct cooling type refrigerator is provided to prevent fluid refrigerant flowing out of an evaporator from flowing into a compressor. CONSTITUTION: A system includes a compressor(32); a condenser(34); capillaries(38a,38b); multiple evaporators(40a,40b); and accumulators(42a,42b). The compressor compresses refrigerant. The condenser condenses refrigerant having pass the compressor. The capillaries decompress refrigerant condensed by the condenser. The evaporators are installed to be directly exposed in storage compartments and evaporate refrigerant expanded by the capillaries. The accumulators prevent fluid refrigerant, flowing out of the evaporators, from flowing into the compressor.

Description

System of Anti-Inflow of Liquid working fluid in Direct Cooling Type Refrigerator}

The present invention relates to a direct-cooling refrigerator, and more particularly, to a liquid refrigerant inflow preventing system of a direct-cooling refrigerator for preventing the introduction of the liquid refrigerant to the compressor in the direct-cooling refrigerator refrigeration cycle.

Typically, the refrigerator is classified into an intercooled refrigerator and a direct cooled refrigerator according to a method of cooling the air in the storage space.

The intercooled refrigerator is a structure that indirectly cools the storage space by forcibly circulating the air in the storage space by the operation of a blower fan to the evaporator. The former is mostly applied to large refrigerators because of its excellent cold air efficiency, and the latter is applied to small refrigerators.

The present invention relates to such a direct-cooling refrigerator, and a conventional direct-cooling refrigerator according to the present invention will be described.

1 and 2 is a block diagram showing a refrigeration cycle of a conventional direct-cooling refrigerator.

As shown in Fig. 1 and Fig. 2, a compressor 2 for adiabatic compression of a low pressure refrigerant constitutes a conventional direct cooling refrigeration cycle. A condenser 4 for condensing and liquefying the refrigerant passing through the compressor 2 is connected to the compressor 2 through the refrigerant pipe 5.

The condenser 4 is connected to a plurality of evaporators 10a, 10b installed to be exposed in the storage space. The evaporators 10a and 10b generate cold air to take heat contained in food in the storage space.

Capillary tubes 8a and 8b for reducing the liquid refrigerant flowing into the evaporators 10a and 10b to facilitate evaporation of the refrigerant in the evaporators 10a and 10b are provided between the condenser 4 and the evaporators 10a and 10b. Is installed.

In addition, valves 6 and 16 are provided between the condenser 4 and the capillary tubes 8a and 8b to open and close the refrigerant passages flowing through the one compressor 2 to the plurality of evaporators 10a and 10b. .

In the refrigeration cycle shown in Figure 1 the valve consists of a three-way valve (6). The three-way valve 6 is provided to connect the outlet side refrigerant line 5 of the condenser 4 and the inlet side refrigerant line 5a, 5b of the capillary tubes 8a, 8b.

In the refrigeration cycle shown in Figure 2, the valve is composed of a plurality of two-way valve (16).

And the refrigerant pipe connected to the rear end of the evaporator (10a, 10b) is connected to the compressor (2), compressor (2) → condenser (4) → capillary (8a, 8b) → evaporator (10a, 10b) → compressor A refrigeration cycle connected to (2) is formed.

Therefore, as shown in FIGS. 1 and 2, in the case of the direct-cooling refrigerator equipped with a plurality of evaporators 10a and 10b, the open control operation of the three-way valve 6 or the plurality of two-way valves 16 is performed. Depending on the compressor (2) → condenser (4) → capillary (8a) → evaporator (10a) → compressor (2) consists of a refrigeration cycle or the compressor (2) → condenser (4) → capillary (8b) → evaporator (10b) → refrigeration cycle is connected to the compressor (2) or the compressor (2) → condenser (4) → capillary (8a, 8b) → evaporator (10a, 10b) → compressor ( A refrigeration cycle connected to 2) is configured.

Next will be described the operation of the refrigeration cycle of the conventional direct-cooling refrigerator configured as described above.

When the operation of the refrigeration cycle is required, a microcomputer (not shown) drives the compressor 2 to generate a high temperature, high pressure refrigerant. The refrigerant generated in the compressor 2 is transferred to the condenser 4 through the refrigerant pipe 5, and the refrigerant condenses while releasing heat to the surroundings while passing through the condenser 4.

The refrigerant passing through the condenser 4 is transferred to the capillary tubes 8a and 8b, which pass through the open three-way valve 6 or the plurality of two-way valves 16. The three-way valve 6 or the two-way valve 16 is controlled to be opened and closed by a microcomputer (not shown). Therefore, the refrigerant passing through the condenser 4 is supplied to the capillary tubes 8a and 8b through the three-way valve 6 or the plurality of two-way valves in the open state.

That is, when only the refrigerant pipe 5a or only the refrigerant pipe 5b is opened, the refrigerant is supplied only to the evaporators 10a and 10b associated with the refrigerant pipe 5a (or 5b) in the open state.

The capillary tubes 8a and 8b control the refrigerant in a state where it is easy to evaporate the evaporators 10a and 10b by reducing the high pressure liquid refrigerant. The refrigerant passing through the capillary tubes 8a and 8b deprives evaporators 10a and 10b of heat inside the chamber and vaporizes, and consequently cool cold air is supplied into the chamber.

In the above process, cold air is supplied to the inside of the refrigerator by the evaporators 10a and 10b, and the refrigerant which is changed into a gas state is introduced into the compressor 2, thereby forming a refrigeration cycle. At this time, the refrigerant circulates the refrigeration cycle while changing from high temperature high pressure to low temperature low pressure. The refrigeration cycle is a heat exchange while the refrigerant circulates between the condenser and the evaporator.

However, the refrigeration cycle of the conventional direct cooling refrigerator configured as described above causes the following problems.

The liquid refrigerant discharged from the capillary tubes 8a and 8b is vaporized while absorbing external heat while passing through the evaporators 10a and 10b. Therefore, most of the phase of the refrigerant passing through the evaporators 10a and 10b is gas, and the gas refrigerant enters the compressor 2.

However, the evaporators 10a and 10b do not suck the heat necessary to vaporize the refrigerant 100% from the outside due to the efficiency of the evaporator itself and the frost attached to the evaporator. Therefore, some of the refrigerant passing through the evaporators 10a and 10b cannot be vaporized and remain in a liquid state.

The liquid refrigerant not vaporized in the evaporators 10a and 10b flows into the compressor 2. When the liquid refrigerant flows into the compressor 2 as described above, the reliability of the compressor 2 is lowered.

In other words, the refrigerant mixed with gas and liquid increases the amount of work required by the compressor than the pure gas refrigerant and decreases the efficiency of the compressor. In addition, a problem occurs that corrosion occurs as the liquid refrigerant flows into the compressor.

And when liquid refrigerant flows into the compressor 2, there exists a possibility of breaking of the compressor 2 suction valve.

In addition, when the liquid refrigerant flows into the compressor, noise is generated when the compressor is driven, and thus a disadvantage may not be provided to the refrigerator user.

It is an object of the present invention to provide a direct cooling refrigerator having a refrigeration cycle in which liquid refrigerant from the evaporator is not introduced into the compressor.

1 is a block diagram showing a direct-cooling refrigerator refrigeration cycle according to the prior art.

2 is a block diagram showing another direct-cooling refrigerator refrigeration cycle according to the prior art.

Figure 3 is a block diagram showing an embodiment of a direct-cooling refrigerator refrigeration cycle according to the present invention.

Figure 4 is a block diagram showing another embodiment of a direct-cooling refrigerator refrigeration cycle according to the present invention.

Explanation of symbols on the main parts of the drawings

2,32 ............. Compressor 4,34 ......... Condenser

5,5a, 5b, 35,35a, 35b ... Refrigerant line 6,36 ......... 3-way valve

16, 46 ... 2 way valve 8a, 8b, 38a, 38b capillary

10a, 40a, ........ Refrigerator Evaporator 10a, 40b ... Freezer Evaporator

42a, 42b ........ Accumulator

Liquid refrigerant inflow prevention system of the direct-cooling refrigerator according to the present invention for achieving the above object, the compressor for compressing the refrigerant; A condenser for condensing the refrigerant passing through the compressor; A capillary tube for depressurizing the refrigerant condensed by the one condenser; a plurality of evaporators installed directly in the storage space to evaporate the refrigerant expanded by the capillary tube; And an accumulator for preventing the liquid refrigerant flowing out of the evaporator from flowing into the compressor.

According to the configuration as described above, the liquid refrigerant from the evaporator can be prevented from flowing into the compressor.

The liquid refrigerant inflow prevention system of the direct cooling refrigerator is characterized in that it comprises a three-way valve for selectively opening and closing the refrigerant pipe flowing through the compressor to the plurality of evaporators.

The liquid refrigerant inflow prevention system of the direct-cooling refrigerator is characterized in that it comprises a plurality of two-way valve for opening and closing the refrigerant pipe flowing through the compressor to the plurality of evaporators.

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

3 and 4 is a block diagram showing a refrigeration cycle of the direct-cooling refrigerator according to the present invention.

As shown in FIG. 3 and FIG. 4, the compressor 32 which adiabatic-compresses low-pressure refrigerant comprises the direct cooling refrigeration cycle. In addition, a condenser 34 for condensing and liquefying the refrigerant passing through the compressor 32 is connected to the compressor 32 through the refrigerant pipe 35.

The condenser 34 is connected to a plurality of evaporators (40a, 40b) installed exposed in the storage space. The evaporators 40a and 40b generate cold air to take heat contained in food in the storage space.

Capillary tubes 38a and 38b for reducing the liquid refrigerant flowing into the evaporators 40a and 40b to facilitate evaporation of the refrigerant in the evaporators 40a and 40b are provided between the condenser 34 and the evaporators 40a and 40b. Is installed.

The accumulates 42a and 42b are connected to the rear ends of the evaporators 40a and 40b. The accumulators 42a and 42b separate the low-temperature refrigerant passing through the evaporators 40a and 40b into a gaseous refrigerant and a liquid refrigerant to prevent the liquid refrigerant from entering the compressor 32. .

Further, valves 36 and 46 for opening and closing the refrigerant passages flowing through the one compressor 32 to the plurality of evaporators 40a and 40b are installed between the condenser 34 and the capillary tubes 38a and 38b. .

The valve according to the first embodiment consists of a three-way valve 36. The three-way valve 36 is provided to connect the outlet side refrigerant line 35 of the condenser 34 and the inlet side refrigerant lines 35a and 35b of the capillary tubes 38a and 38b. The three-way valve 36 is configured to selectively open and close the refrigerant pipes 35a and 35b connected to the plurality of evaporators 40a and 40b under the control of a microcomputer (not shown).

In addition, the valve according to the second embodiment includes a plurality of two-way valves 46. The two-way valve 46 is installed in each of the refrigerant pipes 35a and 35b connected to the plurality of evaporators 40a and 40b under the control of a microcomputer (not shown) to selectively select the refrigerant pipes 35a and 35b. Open and close by

And a refrigerant pipe connected to the rear end of the accumulator 42 is connected to the compressor 32, the compressor 32 → condenser 34 → capillary (38a, 38b) → evaporator (40a, 40b) → A refrigeration cycle is formed, which is connected to the cumulate 42 → compressor 32.

Accordingly, as shown in FIGS. 3 and 4, in the case of a direct-cooling refrigerator having a plurality of evaporators 40a and 40b, the open control operation of the three-way valve 36 or the plurality of two-way valves 46 is performed. Depending on the compressor 32, the condenser 34, the capillary 38a, the evaporator 40a, the accumulator 42a, the compressor 32 is connected to the compressor 32, or the compressor 32 → a condenser 34 → capillary 38b → evaporator 40b → accumulator 42b → a refrigeration cycle connected to the compressor 42, or the compressor 32 → condenser 34 → capillary ( 38a, 38b) → evaporators 40a, 40b → accumulators 42a, 42b → a refrigeration cycle connected to the compressor 32.

Next will be described the operation of the liquid refrigerant inflow prevention system of the direct-cooling refrigerator configured as described above.

When the operation of the refrigeration cycle is required, the microcomputer (not shown) drives the compressor 32 to generate a high temperature, high pressure refrigerant. The refrigerant passing through the compressor 32 is transferred to the condenser 34 through the refrigerant pipe 35, and the refrigerant condenses while releasing heat to the surroundings.

The refrigerant passing through the condenser 34 is delivered to the capillary tubes 38a and 38b, and passes through the three-way valve 36 or the plurality of two-way valves 46. The three-way valve 36 or the plurality of two-way valves 46 are controlled to be opened and closed by a microcomputer (not shown). Therefore, the refrigerant passing through the condenser 34 is supplied to the capillaries 38a and 38b through the three-way valve 36 or the plurality of two-way valves 46 which are in an open state.

That is, when only the refrigerant pipe 35a or only the refrigerant pipe 35b is opened, the refrigerant is supplied only to the evaporators 40a and 40b associated with the refrigerant pipe 35a (or 35b) in the open state.

The capillary tubes 38a and 38b control the liquid refrigerant under high pressure and adjust the amount of refrigerant to flow at a constant rate so that the capillaries 38a and 38b are easily evaporated in the evaporators 42a and 42b. The coolant vaporizes heat in the refrigerator by the evaporators 40a and 40b, and as a result, cold air is generated in the storage space.

In the evaporators 40a and 40b, the refrigerant is not 100% vaporized, so some of the refrigerant remains in a liquid state. As described above, the refrigerant in which the liquid state and the gas state are mixed is discharged from the evaporators 40a and 40b and introduced into the accumulates 42a and 42b.

The accumulates 42a and 42b are provided at the front end of the compressor 32 to separate the liquid refrigerant and the gas refrigerant from the mixed refrigerant of the liquid and gas, and send only the gas refrigerant to the compressor 32. As described above, the accumulators 42a and 42b are installed at the front end of the compressor 32 to prevent the liquid refrigerant not vaporized from the evaporators 40a and 40b from entering the compressor 32. The gas refrigerant introduced into the compressor 32 is compressed again, and then the refrigeration cycle process is repeated.

In addition, when the refrigeration cycle is operated at a low temperature, the condenser 34 is condensed well, while the evaporator is relatively less evaporated, so the amount of refrigerant passing through the evaporators 42a and 42b is smaller than the amount passed through the condenser. For example, if the amount of refrigerant in the condenser 34 is 100, the amount of refrigerant in the evaporators 40a and 40b is relatively smaller than the amount of refrigerant in the condenser 100. When there is a shortage of refrigerant at the low temperature as described above, the accumulates 42a and 42b further have excess refrigerant, and thus serve to compensate for the insufficient refrigerant in the refrigeration cycle.

The embodiment of the present invention is only one embodiment of the technical idea of the present invention, and of course, other modifications are possible within the technical idea of the present invention.

The present invention having the configuration as described above is expected the following effects.

By installing the accumulator between the evaporator and the compressor to prevent the liquid refrigerant flow into the compressor, it is possible to increase the refrigerant compression efficiency of the compressor and to prevent corrosion inside the compressor to increase the reliability of the compressor.

In addition, by installing the accumulator as described above it is possible to solve the lack of refrigerant at low temperatures.

Claims (3)

A compressor for compressing the refrigerant; A condenser for condensing the refrigerant passing through the compressor; A capillary tube for reducing the refrigerant condensed by the one condenser; A plurality of evaporators installed directly exposed to the storage space to evaporate the refrigerant expanded by the capillary; And an accumulator for preventing the liquid refrigerant flowing out of the evaporator from being introduced into the compressor. The system of claim 1, further comprising a three-way valve for selectively opening and closing the refrigerant passage flowing through the compressor to the plurality of evaporators. The system of claim 1, further comprising a plurality of two-way valves for opening and closing a refrigerant pipe flowing through the compressor to the plurality of evaporators.