KR19990047048A - Refrigerator with STIRLING CYCLE - Google Patents

Abstract

The present invention relates to a refrigerator using a stirling cycle, and more particularly, to lower the power consumption of the refrigerator, and to replace the refrigerant with water to facilitate the replacement of the refrigerant during A / S, and the blower fan has a temperature. It is possible to give efficiency to room temperature control because it is operated according to.

To this end, the present invention provides a freezer compartment cooler 10, a refrigerator compartment cooler 20 connected in series by the freezer compartment cooler and a refrigerant pipe, and cold air emitted from each of the coolers 10 and 20 to circulate into the room. It is installed between the blower fan 7 and the freezing chamber cooler 10 and the refrigerating chamber cooler 20 to repeat the isothermal compression and isothermal expansion to radiate heat in the compression unit and absorb heat in the expansion unit 42. Sterling modular module 40, a heat exchanger (8) installed on the surface of the heat absorbing portion of the sterling modular to cool the refrigerant flowing in the refrigerant pipe, and installed between the sterling modular 40 and the freezer compartment cooler (10) It consists of a circulation pump (9) for forcibly circulating the refrigerant.

Description

Refrigerator using Stirling cycle (ス ｔｉｒｌｉｎｇ ｙｙ ｌｌ)

The present invention relates to the field of refrigerators and, more particularly, to a refrigerator using a stiring cycle.

In general, a refrigerator is a refrigeration refrigerating device that allows food to be kept fresh for a long period of time by reducing the temperature in the refrigerator by repeating a refrigeration cycle of compressing, condensing, expanding and evaporating refrigerant. It is a generalized home appliance used.

The basic configuration of the refrigerator will be described below.

However, components included in the description process are generally known, and thus the illustration is omitted.

The refrigerator includes a compressor for raising and lowering the gas refrigerant of low temperature and low pressure to a high temperature and high pressure state, and a condenser for cooling and condensing the refrigerant of the high temperature and high pressure gas flowing from the compressor into a liquid refrigerant having a temperature of 40 ° C. and a pressure of 9 atm. (Condenser), a capillary tube for depressurizing the refrigerant introduced through the condenser compared to the diameter of the refrigerant tube of the other part, and the air in the refrigerator at a relatively high temperature while evaporating the refrigerant through the capillary at a low temperature and low pressure. It is composed of an evaporator which lowers the inside of the furnace as it is heat exchanged.

The structure of a conventional refrigerator operated by the freezing and refrigerating system is divided into a freezer compartment for storing frozen food and a refrigerating compartment for storing refrigerated food, and a cooler (or heat exchanger) for freezing and refrigerating each chamber. There is usually only one unit behind the freezer compartment.

As described above, in the case of a refrigerator equipped with a single cooler, the freezer air and the refrigerating room air are heat-exchanged at low temperatures as the cooler passes through the cooler. The process is repeated.

However, the refrigerator has no choice but to reduce the freezing and refrigerating efficiency by simultaneously cooling the freezer compartment and the refrigerating compartment by a single cooler.

In addition, as the cold compartment-side cold air is mixed with the freezer compartment cold and introduced into the freezer compartment, the food smell of the refrigerating compartment is transferred to the freezer compartment and soaked in the food stored in the freezer compartment.

Accordingly, refrigerators that double the freezing and refrigerating efficiency and independently cool the freezer compartment and the refrigerating compartment so that the odor in the refrigerating compartment do not transfer to the freezer compartment have been developed. It is roughly classified in parallel.

First, the parallel type is provided with coolers in the freezer compartment and the refrigerating compartment, respectively, and separates the refrigerant tube allowing the refrigerant to be supplied to the freezer compartment cooler and the refrigerant tube for allowing the refrigerant to be supplied to the refrigerator compartment cooler. When cooling the freezer by installing solenoid valves to control the flow, the solenoid valve on the refrigerating compartment is closed to prevent the refrigerant from being supplied to the refrigerating compartment, and the solenoid valve on the refrigerating compartment is opened to allow the refrigerant to be supplied only to the freezer compartment When the cooling system is closed, the solenoid valve on the freezer compartment is closed to block the refrigerant from being supplied to the freezer compartment, and the refrigerator side solenoid valve is opened to allow the refrigerant to be supplied only to the refrigerating compartment.

On the other hand, Figure 1 shows an example of a tandem refrigerator, the configuration of each of the cooler (10), 20 is provided in the freezer compartment (1) and the refrigerating chamber (2), the refrigerant pipe (3) is a compressor (4) ), Condenser (5), capillary tube (6), the freezer compartment cooler (10), the refrigerating compartment cooler (20) to be connected via a single pipe in order.

Since there is no solenoid valve installed in parallel in series, the valve noise can be reduced, and since the refrigerant pipe is disconnected, the configuration can be simplified.

However, the above-described series refrigerators have a higher efficiency than the refrigerators operated by one cooler, but the power consumption is maintained at the same level, and therefore, the development of a refrigerator that can reduce the power consumption is an urgent task.

The present invention has been made to solve the above-mentioned conventional problems, the object is to reduce the power consumption while maintaining the efficiency of the refrigerator the same or more than the conventional.

The present invention for achieving the above object is a freezer compartment cooler, a refrigerator compartment cooler connected in series by the freezer compartment cooler and a refrigerant pipe, a blower fan for circulating the cold air emitted from each of the coolers to the room, Is between the freezer compartment cooler and the refrigerating compartment cooler isothermal compression and isothermal expansion repeated repeated heat dissipation in the compression section and the heat absorbing portion in the expansion section, and installed on the surface of the heat absorbing section of the sterling modular flows inside the refrigerant pipe The present invention provides a refrigerator using a sterling cycle, comprising a heat exchanger for cooling a refrigerant, and a circulation pump installed between the sterling modular and a freezer compartment for forced circulation of the refrigerant.

1 is a schematic configuration diagram of a refrigerator in which a freezer cooler and a refrigerator cooler are connected in series

2 is a schematic diagram of a refrigerator of the present invention using a stirling cycle

3 is a cross-sectional view of a sterling module for achieving a sterling cycle

Explanation of symbols for main parts of the drawings

3: refrigerant pipe 7: blower fan

8 heat exchanger 9 circulation pump

10: freezer cooler 20: refrigerator cooler

40: Stirling Modular 41: Compression part

42: inflation

Hereinafter, the configuration and operation of the refrigerator using a Stirling Cycle will be described in detail with reference to the accompanying FIG. 2.

The refrigerator includes a freezer compartment cooler 10 installed in a freezer compartment, a refrigerator compartment cooler 20 connected in series by the freezer compartment cooler and a refrigerant pipe 3, and cold air emitted from each of the coolers to the room. A free piston sterling cooler installed between the blower fan 7 and 7a and the freezer compartment cooler and the refrigerating compartment cooler to repeat isothermal compression and isothermal expansion to radiate heat in the compression section and endothermic in the expansion section. Piston Stirling Cooler (hereinafter referred to as “sterling modular”) 40, a heat exchanger 8 installed on the heat absorbing part surface of the Stirling modular to cool the refrigerant flowing in the refrigerant pipe 3, and the Stirling. It is provided between the modular 40 and the freezer compartment cooler 10 is composed of a circulation pump (9) for forced circulation of the refrigerant.

The Stirling modular 40, which replaces the conventional compressor 4, is divided into a compression unit 41 and an expansion unit 42 according to the action as shown in FIG.

Compression unit 41 is composed of a cover 410, a motor 411 embedded in the cover, and a piston 412 for reciprocating left and right in the drawing by the motor, the expansion unit 42 The frame 420 constituting the outer appearance, the placer (421) reciprocating left and right reciprocating motion by the compression force and the expansion force of the piston, and is installed on the outer peripheral surface of the displacer accumulates heat It consists of a heat accumulator 422 for this.

In addition, a compression space 43 is formed between the piston 410 and the displacer 421, and an expansion space 44 is formed between the displacer 421 and the frame 420.

Therefore, when a positive voltage of an AC power is applied to the motor 411, the piston 410 is moved to the left in the drawing, and the internal gas is compressed as the volume of the compression space 43 decreases. When the pressure rises as the space is reduced by the ideal gas equation PV = nRT (P: pressure, V: volume, R: constant, T: temperature), the temperature of the compression space 43 increases in proportion to this.

In the compression process, a part of the gas is moved to the expansion space 44 through the heat storage 422, and when the pressure of the compression space 43 exceeds a certain degree, the displacer 421 is moved to the left in the drawing. As the volume of the expansion space 44 is reduced, the gas in the expansion space is temporarily compressed.

At this time, when the motor 411 is switched to the voltage (­), the piston 410 is moved to the right in the drawing while the expansion space 44 rapidly expands and becomes cold.

Since the expansion action is also inversely proportional to the pressure (P) and the temperature (T) by the ideal gas equation PV = nRT, the temperature increases rapidly as the pressure increases.

Accordingly, the cold air of the expansion part 42 is transferred to the heat exchanger 8 installed around the expansion part 42 to maintain a cold state, and the refrigerant passing therethrough is heat-exchanged to a low temperature so as to cool the cooler 10 for the freezer compartment. Flows into.

The refrigerant introduced into the freezer compartment cooler 10 absorbs heat from the room to lower the temperature of the room, and the coolant is introduced into the refrigerator compartment cooler 20 at a temperature slightly higher than that of the freezer compartment cooler 10. The refrigerant introduced into the refrigerating compartment cooler 20 absorbs heat in the refrigerating compartment to lower the room temperature, and at the same time, the refrigerant is absorbed to increase its own temperature.

Thus, the freezing chamber 1 and the refrigerating chamber 2 are cooled down, and the endothermic refrigerant flows back into the Stirling Modular 40 and repeats the circulation process of heat exchange at low temperature. It is cooled until, the power for forcibly circulating the refrigerant is made by a circulation pump (9) located between the freezer compartment cooler (10) and the Stirling modular (40).

On the other hand, the variable speed motor 70 so that the number of revolutions can be added or reduced in accordance with the load (temperature) of each chamber in the freezer compartment side blowing fan 7 and the refrigerating compartment side blower fan 7a for blowing to the indoors for blowing the cold air. Was applied to efficiently control the temperature of each chamber.

That is, when the difference between the indoor set temperature and the current temperature is large due to the temperature sensor (not shown), the rotation speed of each blower fan 7 and 7a is increased to increase the amount of air, thereby rapidly increasing the indoor temperature. If the difference between the set temperature of the room and the current temperature is small by the temperature sensor, the rotation speed of each blower fan (7) (7a) is slowed down to slow down the speed of the room temperature.

As described above, when the efficiency of the refrigerator operated by the Stirring cycle is quantified, in the case of a refrigerator having a capacity of 530 L, the temperature of the compression part 41 is 45 ° C. and the temperature of the expansion part 42 is fixed at −25 ° C. If it is assumed that the input is 45W and the freezing capacity is 80W. At this time, the efficiency is the freezing capacity / input, so when the above value is substituted, 80/45 = 1.77.

On the other hand, the efficiency of the existing steam compression refrigerator is only 1.2, it can be seen that the efficiency is superior.

Accordingly, power consumption is reduced by about 15%, thereby improving the efficiency of the refrigerator.

On the other hand, the working medium (primary medium) for operating the sterling modular 40 is most preferably to use helium (He) having a high specific heat and relatively low boiling point, but if there is an equivalent or more effect is limited to any gas It can be applied without this.

In addition, the coolant (secondary medium) flowing through the coolant tube 3 is the most inexpensive, easy to purchase water is suitable, and can be applied regardless of any material as long as the liquid can be replaced.

In this case, when the water is used as it is, it is preferable to use water mixed with an antifreeze in order to prevent the freezing at 0 ℃.

The refrigerator using the stirling cycle as described above can double the efficiency and reduce the power consumption by about 15% compared to the conventional refrigerator.

In addition, by replacing the refrigerant with water (A), it is possible to facilitate the replacement of the refrigerant during the A / S, as well as the blower fan is added or subtracted according to the temperature it is effective to control the room temperature.

Claims (4)

Freezer cooler, A refrigerator compartment cooler connected in series by the refrigerator compartment cooler and a refrigerant pipe; A blowing fan for circulating cold air emitted from each of the coolers into the room, A sterling modulator installed between the freezer compartment cooler and the refrigerator compartment cooler to repeat isothermal compression and isothermal expansion to radiate heat in the compression unit and endothermic at the expansion unit; A heat exchanger installed on a surface of the heat absorbing portion of the sterling modular to cool the refrigerant flowing in the refrigerant pipe; A refrigerator using a sterling cycle, which is installed between the sterling modular and the freezer compartment cooler and configured with a circulation pump for forced circulation of the refrigerant. The method of claim 1, The working medium of the sterling modular is a refrigerator using a sterling cycle, characterized in that helium. The method of claim 1, Refrigerator using a Stirling cycle, characterized in that the refrigerant contained in the refrigerant pipe is water containing the antifreeze. The method of claim 1, The fan motor that provides the blowing power to the blower fan slows down the rotation speed when the difference between the set temperature in the freezer or refrigerator compartment and the current temperature is small, and slowly decreases the room temperature. When the difference is large, the refrigerator using a sterling cycle, characterized in that to quickly lower the room temperature by increasing the rotation speed.