KR940009568B1 - Defrosting device of refrigerator by stirling cycle module - Google Patents

Abstract

The apparatus eliminates the frost on a cooling part by connecting a defrosting tube to a heat radiation tube, abd making the high temp coolant water of a Sterling cooler radiator flow in the defrosting tube for an every predefined time. The defrosting apparatus comprises the defrosting tube (15) slantedly/screwedly wound around the cooling part (6) of the Sterling cooler (4); the heat radiation tube (8) having an entrance (8a)/an exit (8b) connected to both ends of the defrosting tube (15); 3-way valves (16, 17) installed on the two tube connection parts; a timer (18), connected to the 3-way direction valve, recovering the cooling part at a predefined time; a defrosting water guide means (20); a screwed guide (22).

Description

Defroster of Sterling Cycle Refrigerator

1 is a cross-sectional view of a conventional sterling cycle refrigerator.

2 is a block diagram of a conventional defrosting apparatus.

3 is a cross-sectional view of a sterling cycle refrigerator according to the present invention.

4 is a plan view of main parts of the present invention.

* Explanation of symbols for main parts of the drawings

1: refrigerator body 4: sterling cooler

6: cooling part 7: heat radiating part

8: heat dissipation tube 8a, 8b: inlet and outlet

11: drip tray 13: driving motor

14: motor housing 15: defrost tube

16, 17: 3-way valve 18: timer device

20: defrost water guide means 21: inclined guide piece

The present invention relates to a defrosting apparatus for a stir cycle refrigerator, and more particularly, to a defrosting apparatus for a stir cycle refrigerator, which enables the frost generated in the cooling portion of the sterling cooler to be easily removed using its own heat generated from the heat radiating portion. .

Conventional refrigerators use a Rankine cycle to circulate refrigerant through closed pipes to cool the air. The compressor condenses the refrigerant in the condenser and evaporates it through the expansion valve and the evaporator to cool the evaporator. On the other hand, the cooling is performed by circulating the cold air heat-exchanged around the evaporator to the freezer compartment and the refrigerating compartment by an air circulation fan, wherein the air around the evaporator passes through the evaporator to provide the heat of evaporation to the refrigerant and Is cooled.

Conventional refrigerators as described above have a serious adverse effect on air pollution, such as the refrigerant (C-12 R-12) destroys the air ozone layer, and the use of such refrigerants has recently been regulated. Was done.

Therefore, the present inventors have devised to solve the above-mentioned conventional defects, and use a stirling cycle module as a cooler to cool the air and circulate the cooled air to the article storage room with a cold air circulation fan. The present invention has been applied to patent applications Nos. 90-22023, 22305, and 22308 to develop a Stirring Cycle Type Refrigerator which does not require a refrigerant by cooling an article such as food.

However, such a conventional sterling cycle refrigerator has a defect that deteriorates the heat transfer effect due to frost on the cooling unit, which is a cold air generating unit, when the sterling module that is generated, that is, the sterling cooler is operated for a long time.

Therefore, a defrosting device for melting the frost of the cooling unit, which is a cold air generating unit, is required. FIG. 1 is a cross-sectional view showing a stir cycle refrigerator equipped with such a defrosting device, and FIG. 2 is a defrosting device configuration diagram. The freezing chamber 2 and the refrigerating chamber 3 are provided in the main body 1, and the sterling cooler 4 for generating cold air, and the cold air circulation fan 5 for circulating cold air are provided. The Stirling Cooler (4) has a cooling unit (6) and a heat dissipation unit (7). The heat dissipation unit (7) is connected to a heat dissipation tube (8), and the defrost heater (9) is wound on the cooling unit (6). The defrost heater 9 is controlled to be operated by the defrost timer 10. At the lower end of the sterling cooler 4 is provided with a water support 11 for collecting the water of frost melted by the defrosting action.

In the figure, 8a, 8b shows the coolant inlet and outlet, 12 shows the insulation plate, 13 shows the drive motor, 14 shows the motor housing.

The Stirling cycle refrigerator configured as described above generates cold air from the cooling unit 6 of the Stirling Cooler 4 as the driving motor 13 operates. The cold air is cooled by the cold air circulation fan 5 and the freezing chamber 2. The heat circulated to the refrigerating compartment 3 and released from the heat radiating unit 7 are cooled by the cooling water. When the Stirling Cooler 4 is operated, frost starts to form in the Cooling Unit 6, and when it reaches a predetermined time and is formed at a predetermined thickness, the Stirring Cooler 4 is stopped and the Cooling Unit is operated by the timer device 10. (6) The defrost heater 9 mounted on the surface operates to melt frost and water is collected in the water support 11 located at the bottom.

The defrosting apparatus of the conventional sterling cycle refrigerator attempted as described above has a defect in that an electric heating heater, which consumes a lot of power and is expensive, needs to be used as a defrost heater to remove frost generated in the cooling unit.

The present invention has been devised to solve the above-mentioned conventional defects. The defrosting tube is installed in the cooling section of the sterling cooler, and the defrosting tube is connected to the heat dissipation tube. The frost tube melts and removes the cooling part by flowing to the defrost tube at regular intervals, while the frost melted water flows to the outer circumferential wall of the sterling cooler to cool the radiator and the driving motor and then evaporate to cool the sterling cooler. The defrosting of the portion to its own heat source by a simple structure, and by cooling the heat radiating portion and the drive motor to improve the ability to generate cold air This invention will be described in detail by the accompanying drawings as follows.

3 and 4 show the configuration of the defrosting apparatus according to the present invention. As shown in the drawing, the heat dissipation tube 8 is connected to the heat dissipation unit 7 of the sterling cooler 4, and the sterling cooler 4 is shown. Defrost tube (15) is wound around the cooling unit (4) of the) and both ends of the defrost tube (15) are connected to the inlet and outlet (8a) (8b) side of the heat dissipation tube (8), respectively, An automatic three-way valve (16) (17) is provided to form another cooling water closed circuit surrounding the cooling section (6). The defrost tube 15 is spirally wound around the cooling unit 6 so that no water remains inside when the cooling water line is closed, and the automatic three-way valve 16 and 17 are connected to the timer device 18. Controlled. In addition, the main surface of the sterling cooler (4) is provided with defrost water guide means 20 for guiding the water melted by the frost from the cooling unit 6 to the bottom, and the bottom of the sterling cooler (4) for collecting defrost water Pedestal 11 is provided.

The defrost water guide means 20 is provided with an inclined guide 21 at the lower end of the cooling unit 6 for collecting the defrost water of the cooling unit 6, the water collected by the inclined guide 21 is a sterling cooler (4) Cooling while flowing down the wall surface of the) is to install the spiral guide 22 to fall on the drive motor (13). And the water support 11 is installed directly under the motor housing 14 to evaporate the final water collected by the heat of the drive motor housing (14). 19 shows a rotation direction adjusting device for adjusting the rotation direction of the drive motor 13, 23 shows a cooling water circulation pump.

According to the present invention as described above, when the sterling cooler 4 forms a stirring cycle according to the operation of the driving motor 13, the cooling unit 6 is cooled to generate cold air, and the surface of the cooling unit 6 in the normal operating state. The temperature is below 30 ° or less, and when the heat is exchanged by contacting the surface of the cooling unit 6 of the Stirling Cooler 4 with high temperature (about 5 ° C.) warm air in the refrigerator, the surface of the cooling unit 6 has frost. Will be created. When the Stirling Cooler 4 is operated for a predetermined time, the automatic three-way valves 16 and 17 are operated by the timer device 18 so that the high-temperature cooling water exiting the radiating portion 7 of the Stirling Cooler 4 is the heat dissipation tube. Instead of going to (8), it flows to the defrost tube (15) surrounding the cooling section (6).

After the defrost time has elapsed, the automatic three-way valve (16) (17) is operated by the timer device (18) so that the heat dissipation tube (8) forms a closed circuit, and the melted frost water is applied to the inclined guide piece (21). By collecting the upper portion of the drive motor 13 flows down along the high temperature wall to move to the water support 11, the amount is reduced. That is, the defrost water passes through the spiral inclined guide piece 21 while cooling the outer wall of the heat dissipation part 7 and the driving motor housing 14, and part of the defrost water is collected in the water support 11 to drive the motor 13. It is evaporated slowly by heat radiation.

As described above, the present invention eliminates the frost generated in the cooling unit of the sterling cooler by using a simple device as its own heat source without using an external device such as an electric heating heater, which is expensive and consumes a lot of power. In terms of benefits, the defrosting water is used to cool the heat dissipation unit and the driving motor, thereby improving the performance and cold air generating ability of the driving motor and eliminating the need for treating the defrosting water separately.

Claims (6)

The defrost tube 15 is wound around the cooling section 6 of the stirling cooler 4 installed in the stirling cycle refrigerator, and both ends of the defrosting tube 15 are inlet and outlet 8a and 8b sides of the heat dissipation tube 8. The defrosting apparatus of the Stirring cycle refrigerator, characterized in that the connection to both ends of the automatic three-way valve (16) (17) is configured to defrost the cooling unit (6) with radiant cooling water. 2. The defrosting apparatus according to claim 1, wherein the defrosting tube (15) is wound in a spiral inclined around the cooling section (6) of the Stirling cooler (4). The method of claim 1, wherein the automatic three-way valve (16, 17) is connected to the timer device 18, the cooling unit 6 is configured to regenerate every predetermined time with a radiant cooling water of the stirling cycle refrigerator Defrosting device. According to claim 1, characterized in that the defrost water guide means for guiding the defrost water of the cooling unit 6 to the lower water support 11 on the outer peripheral surface of the sterling cooler (4) Defrosting device for a sterling cycle refrigerator. According to claim 4, The defrost water guide means 20 is installed by the inclined guide 21, the inclined guide 21 is installed in the lower end of the cooling unit 6 to collect the defrost water of the cooling unit (6) The defrosting apparatus of the stir cycle refrigerator, characterized in that the spiral guide 22 is installed so that water flows down along the high temperature wall of the stirling cooler (4) and then falls on the driving motor (13). The water base 11 according to any one of claims 1 to 5, wherein the water collecting base 11 for collecting water is installed directly under the motor housing 14, so that the final water collected is evaporated by the heat of the motor housing 14. Defrosting apparatus for a sterling cycle refrigerator characterized in that.