JPH11173710A - Defrosting system using exhaust heat of compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To defrost by using exhaust heat of a compressor without separately using energy required for defrosting and save energy by conveying the medium of a medium circulating circuit heated in a heat storage part to an evaporator upon defrosting the evaporator. SOLUTION: A high temperature ad high pressure outlet medium from a compressor 7 flows in a heat storage part 10 before it enters a condenser 8 to perform a heat exchanging between the pipeline of a refrigerant circuit and a heat storage agent and the heat of the outlet refrigerant is stored in the heat storage agent. This heat is applied to a medium through the pipeline of a medium circulating circuit to heat the medium. When frost adheres to an evaporator 3, a pump 13 provided in the medium circulating circuit is operated, so that the heated medium is supplied to the evaporator 3 and it is further circulated. Thus, the temperature of the medium circulating in the evaporator 3 further rises. Accordingly, the evaporator can be easily defrosted by using a heat refrigerant discharged from the compressor without using another energy such as en electric heater for defrosting, so that enery can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerator, a refrigerator,
The present invention relates to a defrost system using exhaust heat of a compressor such as an air conditioner.

[0002]

2. Description of the Related Art Conventionally, when removing frost from an evaporator in a refrigeration circuit, a method using an electric heater or a method of directly sending a hot refrigerant discharged from a compressor to an evaporator for defrosting ( JP-A-4-292762). However, the method using an electric heater is uneconomical because it requires energy for defrosting separately, and the method of directly sending the heat refrigerant discharged from the compressor to the evaporator to defrost is used during defrosting. However, there is also a problem that the operation of the compressor needs to be continued, and that the heat refrigerant may flow back into the compressor.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to use a heat refrigerant discharged from a compressor without using another energy such as an electric heater for defrosting. It is an object of the present invention to provide a defrosting system in which it is not necessary to continue the operation of the compressor during defrosting, and the heat refrigerant does not flow back to the compressor during defrosting.

[0004]

Means for Solving the Problems In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a condenser for compressing refrigerant compressed by a compressor,
A capillary tube, a refrigeration circuit for sequentially feeding to the evaporator and returning to the compressor, a heat storage unit for temporarily storing the exhaust heat of the compressor, and defrosting the evaporator using the heat stored in the heat storage unit. A defrosting circuit that performs the defrosting circuit, and in the defrosting system that uses the exhaust heat of the compressor that appropriately operates the refrigeration circuit and the defrosting circuit, transfers the refrigerant discharged from the compressor to the heat storage unit, A refrigerant circuit for temporarily storing the exhaust heat of the compressor in the heat storage unit and returning the heat to the compressor via the condenser, wherein the defrost circuit circulates a medium between the heat storage unit and the evaporator The dehumidifier is characterized in that the medium in the medium circulation circuit heated by the heat storage unit is transferred to the evaporator for defrosting when the evaporator is defrosted.
In the present invention, a heat storage section is provided on the discharge side of the compressor, and the heat medium heated by the heat stored in the heat storage section is transferred to the evaporator for defrosting when defrosting. Since defrosting is performed using the exhaust heat of the compressor without separately using the energy required for defrosting, there is an energy saving effect, and there is no need to continue operating the compressor during defrosting, and the heat refrigerant is compressed. There is no danger of backflow to the machine. After transferring the refrigerant discharged from the compressor to the heat storage unit,
After the heat exchange through the condenser, the temperature of the refrigerant returning to the compressor can be reduced by returning to the compressor, and the temperature of the refrigerating machine oil in the compressor can be prevented from rising.

In order to solve the above-mentioned problems, a second aspect of the present invention is to provide a refrigeration circuit for sequentially feeding a refrigerant compressed by a compressor to a condenser, a capillary tube, and an evaporator and returning the refrigerant to the compressor, and exhaust heat of the compressor. And a defrost circuit for defrosting the evaporator using heat stored in the heat storage unit, and a compressor for operating the refrigeration circuit and the defrost circuit appropriately. In the defrosting system using heat, after the refrigerant discharged from the compressor is transferred to the heat storage unit and the exhaust heat of the compressor is temporarily stored in the heat storage unit,
A refrigerant circuit that flows to a condenser, wherein the defrost circuit includes a medium circulation circuit that circulates a medium between the heat storage unit and the evaporator, and the medium heated by the heat storage unit during defrosting of the evaporator. It is characterized in that the medium in the circulation circuit is transferred to an evaporator for defrosting. The defrosting system according to claim 1, except that the refrigerant discharged from the compressor is transferred to a heat storage unit, and the exhaust heat of the compressor is temporarily stored in the heat storage unit, and then directly returned to the condenser. It is similar. By doing so, the refrigerant circuit can be simplified.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram illustrating a defrosting system using exhaust heat of a compressor of the present invention. FIG.
It is explanatory drawing explaining the other defrost system using the exhaust heat of the compressor of this invention. FIG. 3 is an explanatory sectional view showing an embodiment of the refrigerator provided with the defrosting system of the present invention. FIG.
In this refrigerator, the refrigerator main body 1 is formed by a heat insulating wall, and the refrigerator main body 1 is provided with a food storage chamber 2 for storing food. Further, an evaporator 3 is provided at a lower portion of the food storage room 2, a duct 4 extending vertically is provided at a back side of the food storage room 2, and a blower fan 5 for circulating cool air is provided at an upper portion of the duct 4. The air cooled by the evaporator 3 is circulated as shown by the solid line arrow in the figure to cool the food storage chamber 2. A machine room 6 is provided below the refrigerator body 1. Inside the machine room 6, a compressor 7,
A condenser 8, a condenser fan 9, and a heat storage unit 10 are installed.
The heat medium heated by the heat stored in the heat storage unit 10 is transferred to the evaporator 3 for defrosting when defrosting. Then, the heat generated in the compressor 7 and the condenser 8 by the condenser fan 9 is discharged out of the machine room 6. In the example of FIG.
Is located on the leeward side of the condenser 3, but the arrangement position is not limited to this, and may be on the leeward side of the condenser 3 or another position in the machine room 6.

FIG. 1 shows a cooling circuit of the refrigerator. The refrigerant in the compressor 7 is supplied to the condenser 8 → the capillary tube 11 → the evaporator 3 → the accumulator 12 → the compressor 7 as shown by a solid arrow in the drawing. And a refrigeration circuit that circulates sequentially,
Thereby, the inside of the food storage chamber 2 is cooled. On the other hand, the refrigerator is provided in a part of the condenser 8 after transferring the refrigerant discharged from the compressor 7 to the heat storage unit 10 and temporarily storing the exhaust heat of the compressor 7 in the heat storage unit 10. A heat exchanger (desuperheater circuit) is passed through the radiator 8a, and then returned to the compressor 7. The medium is circulated between the heat storage unit 10 and the evaporator 3 by a dashed line in the figure and a dashed line in the figure. It has a medium circulation circuit indicated by an arrow. 13 is a pump for circulating the medium.

The heat storage section 10 is filled with a heat storage agent (not shown), and the refrigerant circuit and the medium circulation circuit are arranged in the heat storage agent. The heat exchange is performed in the.

When the refrigeration circuit is operated to cool the food storage chamber 2, the high temperature (for example, about 80
C) The high-pressure refrigerant is first sent to the heat storage unit 10 to store the heat in the heat storage agent in the heat storage unit 10 as shown by the dashed arrow in the figure, and then the radiator 8a provided in a part of the condenser 8 After being cooled by heat exchange (for example, about 50 ° C.), the refrigerant returns to the compressor 7 and the refrigerant returned to the compressor 7 is, as shown by a solid arrow in the figure, a condenser 8 → a capillary tube 11 → an evaporator. By circulating sequentially from 3 → accumulator 12 → compressor 7, the inside of food storage chamber 2 is cooled. Here, the high-temperature and high-pressure refrigerant discharged from the compressor 7 is supplied to the heat storage unit 10 before entering the condenser 8.
Therefore, heat exchange is performed between the pipeline of the refrigerant circuit and the heat storage agent, and the heat of the discharged refrigerant is accumulated in the heat storage agent. At the time of storing heat in the heat storage unit 10, the temperature of the refrigerant returning to the compressor 7 is further reduced by heat radiation from the refrigerant discharged from the compressor 7 and the radiator 8a provided in a part of the condenser 8 from the refrigerant. Therefore, the capacity of the compressor 7 can be improved. Since the heat of the discharged refrigerant has already been accumulated in the heat storage agent of the heat storage unit 10, the heat is added to the medium via the medium circulation circuit and heated.

When the operation of the refrigeration circuit is continued, frost adheres to the evaporator 3. In such a case, when the pump 13 provided in the medium circulation circuit is operated, the heated medium is supplied to the evaporator 3 as shown by the dashed line arrow in the figure as described above.
To the evaporator 3 by the circulation of the medium.
The temperature of the medium circulating in the air further increases. In this way, defrosting of the evaporator 3 is performed efficiently.

As shown in FIG. 2, in another defrosting system using the exhaust heat of the compressor of the present invention, the refrigerant discharged from the compressor 7 is transferred to a heat storage unit 10 to After temporarily storing the exhaust heat in the heat storage unit 10, the heat is directly returned to the condenser 8. It is the same as the defrosting system shown in FIG. 1 except that the refrigerant from the heat storage unit 10 is directly returned to the condenser 8. By doing so, the refrigerant circuit can be simplified.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0013]

According to the defrosting system of the present invention, the defrosting of the evaporator can be easily performed by using the heat refrigerant discharged from the compressor without using another energy such as an electric heater for defrosting. Energy saving can be achieved. In addition, the defrosting system of the present invention does not need to keep the compressor running during defrosting, and has the effect that the heat refrigerant does not flow back to the compressor during defrosting.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a defrosting system of the present invention.

FIG. 2 is an explanatory diagram illustrating another defrosting system of the present invention.

FIG. 3 is an explanatory sectional view showing an embodiment of a refrigerator provided with the defrosting system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Food storage room 3 Evaporator 4 Duct 5 Blow fan 6 Machine room 7 Compressor 7 8 Condenser 8a Radiator 9 Condenser fan 10 Heat storage part 11 Capillary tube 12 Accumulator 13 Pump

Claims (2)

[Claims] A refrigeration circuit for sequentially feeding the refrigerant compressed by the compressor to a condenser, a capillary tube, and an evaporator and returning the refrigerant to the compressor; a heat storage unit for temporarily storing exhaust heat of the compressor;
A defrosting circuit that performs defrosting of the evaporator using heat stored in the heat storage unit, and that uses exhaust heat of a compressor that appropriately operates the refrigeration circuit and the defrosting circuit. A refrigerant circuit that transfers the refrigerant discharged from the compressor to the heat storage unit, temporarily stores the exhaust heat of the compressor in the heat storage unit, and then returns the compressor to the compressor via the condenser. The defrost circuit includes a medium circulation circuit that circulates a medium between the heat storage unit and the evaporator, and transfers the medium of the medium circulation circuit heated by the heat storage unit to the evaporator when the evaporator is defrosted. A defrosting system using the exhaust heat of a compressor, wherein defrosting is performed. 2. A refrigeration circuit for sequentially feeding a refrigerant compressed by a compressor to a condenser, a capillary tube, and an evaporator and returning the refrigerant to the compressor, a heat storage unit for temporarily storing exhaust heat of the compressor,
A defrosting circuit that performs defrosting of the evaporator using heat stored in the heat storage unit, and that uses exhaust heat of a compressor that appropriately operates the refrigeration circuit and the defrosting circuit. A refrigerant circuit that transfers refrigerant discharged from the compressor to the heat storage unit, temporarily stores exhaust heat of the compressor in the heat storage unit, and then flows the refrigerant to a condenser, wherein the defrost circuit includes the heat storage unit. A medium circulation circuit that circulates a medium between the unit and the evaporator, and when defrosting the evaporator, transferring the medium in the medium circulation circuit heated by the heat storage unit to the evaporator for defrosting. A defrosting system that uses the exhaust heat of the compressor.