KR100543941B1 - Small-sized refrigerator with a defroster using cycle-conversion - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a defrosting apparatus for a refrigerating table, and in particular, a small refrigerator using a capillary tube to enable a defrosting by converting a refrigeration cycle, but to enable stable operation without damaging the compressor.

I. The technical problem to be solved by the invention.

Currently defrosting means that defrosting is possible only by the change of cycle only in a cycle that is equipped with a large refrigeration unit, that is, a compressor, a condenser, an evaporator, a receiver, an accumulator, an oil separator, an expansion valve, and a fluid shutoff solenoid valve. In the refrigerator of the present invention, defrosting by cycle conversion is virtually impossible because cycles of all such configurations cannot be provided.

All. Summary of the Solution of the Invention.

Therefore, in the present invention, the cycle is converted into an electron valve by using two capillaries, and as a simple structure, defrosting by cycle conversion is easy and does not cause a compressor or the like.

la. Important uses of the invention

       Compact refrigeration table.

Description

Small-sized refrigerator with a defroster using cycle-conversion}

1 is a circuit diagram showing a refrigeration cycle of a small refrigerator in a direct cooling.

Figure 2 is a circuit diagram showing a defrost means in a cycle conversion method in direct cooling.

3 is a circuit diagram of the present invention.

Figure 4 is a circuit diagram showing a defrost system by the heating means in the conventional intercooling

5 is a circuit diagram of a defrost system by cycle conversion in a conventional intercooled cooling system.

Explanation of symbols on the main parts of the drawing

1: compressor 2: condenser

3: evaporator 4: capillary

5: dryer 6: liquid separator

7: electronic valve 8: branch pipe

The present invention relates to a defrosting apparatus of a small refrigerator (aka: refrigeration table), and in particular, even in a small refrigerator of a direct cooling type using a capillary tube, the defrosting cycle can be easily performed and the defrosting can be easily performed without damaging the compressor. It is possible.

In the case of the direct-cooling refrigerator now, the internal affinity is a lot of freezing capacity is reduced, the machine operation time is increased, the power consumption will increase.

In addition, such sexuality is impossible to clean the interior, the interior is unclean, unhygienic, the recent kitchen has been required defrost means even in the direct cooling type, that is, a small refrigeration table that hygiene requires the highest priority.

When defrosting by adopting the current cycle conversion method, as shown in Figs. 4 and 5, the evaporator is mounted only in an intercooling system in which a fan is mounted on the evaporator to blow cold air. A refrigerant that is separated from a condenser to condense the gas of high pressure and high pressure into a liquid of high temperature and high pressure, an evaporator to lower the temperature in the refrigerator, and a receiver to separate moisture from the vaporized refrigerant. Accumulators, oil separators, expansion valves, and fluid shut-off solenoid valves, etc., must be completely equipped to separate liquids from the gas to allow defrosting by cycle conversion.

This is because high temperature and high pressure gas refrigerant is introduced into the evaporator by defrosting the cycle, and after the defrosting, the high temperature and high pressure gas refrigerant can be introduced into the compressor. This is only possible if the compressor is completely equipped with a compressor condenser evaporator receiver accumulator oil separator expansion valve and a fluid circuit breaker solenoid valve.

In addition, a separate device that maintains the pressure of the evaporator at a constant pressure during defrosting, that is, to check the pressure to be equipped with a part for adjusting the gas amount.

However, in a small refrigeration table of direct cooling, practical use is impossible because none of these devices can be mounted and there is nothing suitable for the small capacity.

Therefore, during the cycle conversion in the direct cooling type, if there is no receiver and the receiver shutoff solenoid valve, pressure control is impossible, and high pressure gas flows into the compressor, causing damage to the compressor.

And such devices such as receivers, oil separators or accumulators are suitable for large-capacity of inter-cooling, which is not practical in direct cooling, especially in refrigeration tables of less than 1/2 horsepower.

Therefore, the present invention is to be applied to the refrigeration table of the refrigeration table having a capacity of less than 1/2 horsepower while allowing defrosting by the change of cycle and to enable the stable operation of the compressor, by using two capillaries and an electron valve The cycle can be converted only by the opening and closing of the electromagnetic valve, so that the defrosting by the cycle conversion is easy and does not affect the compressor.

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

       First, the same reference numerals are given to the same components as the conventional ones.

Figure 1 is a circuit diagram showing the configuration of the basic cycle and the defrost cycle of the present invention, the configuration according to the circuit diagram above, first, by suction compression of the low-temperature low-pressure gas refrigerant to increase the pressure and temperature to close the distance between the molecules at room temperature Compressor 1 for easy liquefaction in condenser 2 and condenser 2 for condensing the gas refrigerant of high temperature and high pressure compressed by compressor 1 with liquid refrigerant of high temperature or high pressure A filter drier 5 for removing water or foreign matter contained in a liquid refrigerant having a high temperature or low pressure high pressure condensed in the condenser 2 and a liquid refrigerant having a high temperature or low temperature high pressure filtered by the filter drier 5. By the capillary tube 4 and the capillary tube 4 so as to adiabaticly expand into a low-temperature low-pressure liquid refrigerant to facilitate evaporation in the evaporator 3. Refrigeration cycle in which the low-temperature and low-pressure gaseous refrigerant generated by evaporation in the evaporator 3 and the evaporator 3 so as to absorb the latent heat of evaporation in the evaporator 3 to induce a cooling action are introduced into the compressor 1. In the present invention, between the evaporator and the compressor, a liquid separator 6 connected in series with the electron valve 7 and a capillary tube 4a are provided in series with the filter drier 5a in parallel with the electron valve between the evaporator and the liquid separator. A gas refrigerant having a high temperature and high pressure directly flows into the evaporator 3 by opening and closing the electron valve 7a through the electron valve 7a using the branch pipe 8 between the compressor 1 and the condenser 2. The coolant line 3a is formed so as to defrost the evaporator.

At this time, each of the electronic valve (7, 7a) is to be controlled in a separate control box (9), such control is to be automatically defrosted by the setting of the defrost time or by setting the defrost time of a certain interval Will be.

The configuration of such a control box is an extremely well known technique generally used in the electronic control industry, and such a technique can use various known techniques.

Therefore, when defrosting is to be performed, the electron valve 7a connected by the branch pipe 8, which is closed during the normal refrigeration cycle, is opened and the electron valve 7 mounted between the evaporator 3 and the liquid separator 6 is closed. While the high temperature and high pressure gas refrigerant is introduced into the evaporator 3 through the refrigerant line 3a, defrosting is performed. Before being sucked into the compressor (1) by heat exchange and then filtered through the dryer (5a) and then converted into a liquid refrigerant of low temperature and low pressure through the capillary (4a), flowed into the liquid separator (6) and evaporated in the liquid separator at low temperature. Heat exchanged with the low-pressure gas refrigerant is the gas refrigerant is introduced into the compressor (1).

In addition, when the electron valve 7a and the refrigerant line 3a formed by the branch pipe 8 between the compressor 1 and the condenser 3 open the electron valve 7a, the gas refrigerant having a high temperature and high pressure is the condenser 2. The reason why only the evaporator 3 flows into the evaporator 3 through the electron valve 7a is caused by a capillary tube 4 connected to the dryer 5 in the condenser 2 so that the pressure is naturally reduced. 7a) is introduced into the evaporator 3 through the refrigerant line 3a.

In addition, the high temperature and high pressure gas refrigerant introduced in this way is a heat exchange to the low-temperature high-pressure liquid refrigerant by the defrost of the evaporator (3), capillary tube to convert the heat exchange is made into a low-temperature low-pressure liquid refrigerant to facilitate evaporation While passing through (4a), only the low-temperature low-pressure gas refrigerant in the liquid separator 6 is introduced into the compressor (1).

Since the liquid separator 6 does not have a large temperature variation in a small refrigeration table, the liquid separator 6 is not required in a general refrigeration cycle for refrigeration. 6) is a necessary means, such a liquid separator (6) is a low-pressure low-pressure gas refrigerant is to be sucked into the compressor (1) even in the refrigeration cycle for refrigeration is to enable a more stable operation.

In addition, the low-temperature, high-pressure gas refrigerant evaporated in the evaporator during the refrigeration cycle is the only low-temperature low-pressure gas refrigerant is introduced into the compressor from the liquid separator through the open electronic valve (7) without flowing to the capillary tube.

This is because of the pressure difference that occurs naturally.

Therefore, in the defrosting system of the present invention, stable operation of the compressor can be achieved while defrosting is achieved by conversion of cycles using only two capillaries, two electronic valves, and a liquid separator only in the configuration of a small refrigerator applied to a refrigeration table for storing food. It becomes possible.

Claims (1)

A compressor (1) for compressing a low-temperature low-pressure gas refrigerant into a high-temperature high-pressure gas refrigerant, a condenser (2) for condensing the high-pressure high-pressure gas refrigerant into a low-temperature high-pressure liquid refrigerant, and the low-temperature high-pressure liquid refrigerant The filter dryer (5) for filtering and the capillary tube (4) and the liquid refrigerant at low temperature and low pressure to insulate and expand the liquid refrigerant at low temperature and high pressure to cool the liquid refrigerant at low temperature and low pressure to facilitate evaporation. In a small refrigeration cycle in which the evaporator 3 absorbs and induces a cooling action and the low-temperature low-pressure gas refrigerant generated by evaporation is sucked into the compressor 1, between the evaporator and the compressor, an electron valve 7 and A liquid separator 6 connected in series is formed, and a capillary tube 4a is formed in series with the filter drier 5a in parallel with the electronic valve 7 between the evaporator and the liquid separator, and is connected with the compressor 1. Cycle transformation characterized in that the refrigerant line (3a) is formed so that the high-temperature, high-pressure gas refrigerant is introduced directly into the evaporator (3) through the electromagnetic valve (7a) by using the branch pipe (8) between the shaft (2). Small refrigerator having defrost means by.

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