JPH058458Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a refrigeration system that combines a cold storage material with the evaporator of the refrigeration cycle so that a refrigeration effect can be obtained even when the refrigeration cycle is not operating. (Here, this is referred to as a refrigeration system using refrigerant).

[Prior Art] A conventional refrigeration system using a cold storage material uses, for example, an antifreeze solution (freezing point -30°C) consisting of propylene glycol and water, which has a cold storage effect, around an evaporator that constitutes a part of the refrigeration cycle. A stored cold storage material holder is attached as the cold storage material, and the cold storage material and the evaporator are thermally coupled. Therefore, when the refrigeration cycle is in operation, the evaporator cools the inside of the heat-insulating warehouse and the like, and also cools the cold storage material in the cold storage material holder at the same time. After the refrigeration cycle is stopped, the cold storage material holder exerts the cold storage effect of the cold storage material itself. As a result, it has the advantage of being able to cool the inside of the heat-insulating storage for a long period of time.

By the way, in conventional refrigeration systems that use cold storage materials, when defrosting the evaporator, the refrigerant in the refrigeration cycle is reversely circulated and the gaseous refrigerant, which is heated to high temperature and pressure by hot gas, flows directly into the evaporator. , heat the evaporator.

[Problems to be solved by the invention] However, due to the continuation of the cold storage effect, the cold storage material in the cold storage material holder, which has been cooled by heat absorption from the evaporator, is not normally heated in the evaporator for defrosting. This results in the cooling of itself, leading to an effect that hinders defrosting.

Therefore, the amount of heat consumed for defrosting the evaporator is
It is also consumed to heat the cold storage material in the cold storage material holder. During the defrosting operation, an excessive amount of heat must be added until all of the regenerator material rises to a temperature suitable for defrosting the evaporator, which has the drawback of wasting time and consuming a large amount of heat.

Therefore, in view of the above drawbacks, the present invention provides a refrigeration system using a cold storage material that can defrost an evaporator in a short time and economically, without wasting heat or consuming a large amount of time. .

[Means for Solving the Problems] According to the present invention, there is provided a refrigeration cycle that can defrost an evaporator with hot gas, and a cold storage material holder that thermally couples a cold storage material to the evaporator. In a refrigeration system using a cold storage material in which the cold storage material is melted by a certain amount of heat generated from the evaporator, there is provided a tank that is thermally isolated from the evaporator and can store the cold storage material, and the tank is connected to the cold storage material holder. A refrigeration system using a cold storage material, characterized in that a pipe section connected to the tank and the cold storage material holder guides the movement of the cold storage material, and a control device that controls the movement of the cold storage material. A device is obtained.

[Example] Embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the refrigeration system using a cold storage material of this embodiment includes a refrigeration cycle that can be converted into a hot gas circuit. This refrigeration cycle consists of a compressor 1, a four-way switching valve 2 for hot gas circuit conversion, a condenser 3, a capillary tube 4, and a plurality of parallel evaporation pipes 5 serving as evaporators. A cool storage material holder 6 is attached to each evaporation pipe 5. That is, the cold storage material holder 6 covers the periphery of the evaporator pipe 5 at intervals. Furthermore, the upper part of each cold storage material holder 6 is connected to the pipe 2.
They are connected to each other at 0. An antifreeze solution (freezing point -30°C) consisting of propylene glycol and water is injected into the inside of the cold storage material holder 6. Note that an air vent pipe 13 is attached to the upper end of the cold storage material holder 6 in order to ensure smooth inflow and outflow of the cold storage material 7.

An outflow pipe 8 for guiding the outflow of the cold storage material 7 is connected to the lower end of the cold storage material holder 6, and a tank 9 for storing the cold storage material 7 is connected to the lower end of the outflow pipe 8. The outflow pipe 8 has a solenoid valve 1
2 has been inserted. Further, an inflow pipe 10 is connected between the lower end of the tank 9 and the upper end of the cool storage material holder 6. A pump 11 is inserted into the inflow pipe 10. The pump 11 and the solenoid valve 12 act as a control device that controls the movement of the cold storage material 7, as will be explained later. Note that the tank 9 is located sufficiently below the cool storage material holder 6, and is thereby thermally isolated from the evaporation pipe 5. The pump 11 is for returning the cold storage material 7 stored in the tank 9 into the cold storage material holder 6 via the inflow pipe 10. On the other hand, the solenoid valve 12 controls the outflow of the cold storage material 7 from the cold storage material holder 6 to the tank 9. That is, by opening this solenoid valve 12, the cold storage material holder 6
The melted cold storage material 7 inside can be freely dropped into the tank 9 through the outflow pipe 8 and stored therein. Also, the solenoid valve 12 is closed and the cold storage material 7 is closed.
It is also possible to stop the free fall of the cold storage material 7, return the cold storage material 7 from the tank 9 to the cold storage material holder 6 through the inflow pipe 10 by driving the pump 11, and store it in the cold storage material holder 6. Note that here, the outflow pipe 8 and the inflow pipe 10 are collectively referred to as a pipe section.

Next, the operation of the refrigeration cycle will be explained. During normal operation, the refrigerant is pumped along the solid arrow in the diagram.
It is compressed by a compressor 1 and sent to a condenser 3 via a four-way switching valve 2 as a high-temperature, high-pressure gaseous refrigerant. In the condenser 3, the high-temperature, high-pressure gaseous refrigerant is cooled with air, water, etc., and converted into a high-pressure liquid refrigerant. This liquid refrigerant is adiabatically expanded in the capillary reach tube 4 to become a low-pressure liquid refrigerant, flows into an evaporation pipe 5 serving as an evaporator, absorbs heat around the evaporation pipe 5, and evaporates. The evaporated refrigerant returns to the compressor 1 and repeats the same action again.

At this time, the heat absorption by the evaporation pipe 5 cools the cool storage material 7 in the cool storage material holder 6.

On the other hand, when defrosting the evaporation pipe 5, the hot gas circuit is started and the solenoid valve 12 is opened.

By switching the four-way switching valve 2, the hot gas circuit circulates the refrigerant in the opposite direction to the above-mentioned refrigeration cycle, along the dotted line arrow in the figure, and the high-temperature, high-pressure gaseous refrigerant discharged from the compressor 1. , directly into the evaporation pipe 5 and heated. Therefore, since the propylene glycol aqueous solution that is a component of the cold storage material 7 usually has a freezing point of about -30°C, it is easily melted by the heat radiation from the evaporation pipe 5 and flows through the outflow pipe 8 to the tank 9. fall freely within.

Therefore, the amount of heat generated from the evaporator pipe 5 is not used to raise the temperature of the cold storage material 7, but is used only to raise the temperature of the evaporator pipe 5 itself to a temperature suitable for defrosting, so the large amount of heat generated in the conventional method is You can defrost in a short time without wasting time.

When converting the hot gas circuit to a refrigeration cycle, the four-way switching valve 2 is returned to its original position, the refrigerant is circulated in the direction of the solid arrow in the figure, and the solenoid valve 12 is closed. At the same time, the pump 11 is driven to remove the cold storage material 7 stored in the tank 9.
Return to the cold storage material holder 6 through the inflow pipe 10,
Store.

Incidentally, FIG. 2 shows a case where the refrigerating device using a cold storage material according to this embodiment is mounted in a cooling container. 14 is a container treated with heat insulation. A capillary reach tube 4, a tank 9, and a pump 11 of a condenser 3 equipped with a compressor 1, a condenser blower 15 are housed in the bottom of the container 14. A cold storage material holder 6 is installed on the back side of the container 14.
A covered evaporation pipe 5 is attached. Further, 16 is a container internal blower for circulating cold air within the container, 17 is an outlet for discharging the circulating cold air, and 18 is an inlet for sucking the circulating cold air. The container is provided movably by casters 19 on which the container itself is placed.

[Effect of the invention] As explained above, according to the invention, the cold storage material can flow out from the cold storage material holder that stores the cold storage material and is provided at a position that is thermally connected to the evaporator. Therefore, there is no need to raise the temperature of the cold storage material to the temperature suitable for defrosting the evaporator, as in the case of the evaporator. can be defrosted.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a refrigeration system using a cold storage material according to an embodiment of the present invention, and FIG. 2 is a sectional view of a cooling container in which the refrigeration system using a cold storage material according to an embodiment of the present invention is mounted. 1... Compressor, 2... Four-way switching valve, 3...
Condenser, 4... Capillary reach tube, 5... Evaporation pipe, 6... Cold storage material holder, 7... Cold storage material, 8
... Outflow pipe, 9 ... Tank, 10 ... Inflow pipe, 11 ... Pump, 12 ... Solenoid valve, 13 ...
...Air vent pipe, 14...Container, 15...
Condenser blower, 16...Interior blower, 17...
...discharge port, 18...intake port, 19...caster,
20... Connection pipe.

Claims (1)

[Scope of utility model registration request] It has a refrigeration cycle that can defrost the evaporator with hot gas, and a cold storage material holder that thermally connects a cold storage material to the evaporator, and the cold storage material is melted by constant heat generated from the evaporator. A certain refrigeration system using a cold storage material includes a tank that is thermally isolated from the evaporator and capable of storing the cold storage material, and a tank that is connected to the cold storage material holder, and that is connected to the cold storage material holder. A refrigeration system using a cold storage material, characterized in that it is provided with a pipe section that guides the movement of the cold storage material, and a control device that controls the movement of the cold storage material.