JPH0337098Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a refrigerated vending machine that defrosts the internal temperature and defrosts at predetermined time intervals, and also defrosts each time a product is loaded.

[Conventional technology]

A refrigeration vending machine that sells frozen products unmanned runs a refrigeration cycle in which refrigerant from a compressor 1 passes through a condenser 8, a capillary reach tube 9, an evaporator 2, and returns to the compressor 1, as shown in Figure 2. The inside of the freezer inside the machine is cooled by the evaporator 2. However, in frozen vending machines that handle chilled products such as ice cream and frozen foods, the temperature inside the chamber must be maintained at around -20℃ at all times, but moisture from stored items and outside air can enter the chamber. As a result, frost gradually builds up inside the evaporator 2, the capacity of the evaporator 2 decreases, and the temperature inside the refrigerator tends to rise. Therefore, Japanese Patent Application Publication No. 1987-
In Publication No. 165466, as shown by the dotted line in Figure 2,
The high-temperature gaseous refrigerant from the compressor 1 is sent directly to the evaporator 2 via the electromagnetic valve 5, and the internal fan 4 is stopped to perform defrosting. Conventionally, this defrosting method was implemented in the 1970s.
In Publication No. 22592, as shown in Fig. 3, a temperature controller 3 that has a built-in timer that becomes operational when the power source 10 is turned on detects the temperature inside the refrigerator using a temperature sensor.
By using the output, the contact 12 connected to the compressor 1 is disconnected, thereby stopping the operation of the compressor 1 and controlling the temperature. Also, Jikko 49-
In Publication No. 29482, as shown in FIG. 3, the output of a built-in timer at specified intervals switches the contact 13 to stop the refrigerator fan 4, and causes current to flow through the solenoid valve 5 and into the evaporator 2 through the valve. Defrosting was initiated by directly passing high-temperature gaseous refrigerant. Therefore, in this case, defrosting is performed while the compressor 1 is in operation. When the amount of heat of the gaseous refrigerant is insufficient, a heater may be used in combination. The compressor is always in operation during defrosting. When the defrosting is finished and the temperature is suitable for freezing, and the output of the temperature sensor or the timer reaches the defrosting release time, the contact 13 switches to close the solenoid valve 5, cut off the heater 6, and rotate the fan 4 in the refrigerator. Normal temperature control is performed.

[Problem that the invention attempts to solve]

However, in a vending machine, the product loading door is opened and closed each time the product is replaced or replenished, and the shutter or delivery door is opened and closed each time the product is sold, supplying and discharging the product. Therefore, when sales of products are active, the supply and release of products increases, the door opens and closes many times, and the rotation of the fan 4 inside the vending machine causes the cold air inside the vending machine to escape to the outside, and the outside air to flow inside, reducing moisture. The outside air containing the evaporator is cooled and condensed, increasing the amount of frost on the evaporator 2, making it difficult to maintain the freezing temperature unattended.

[Means for solving problems]

The purpose of the present invention is to eliminate such drawbacks of the conventional vending machine by providing a contact point that connects and disconnects in conjunction with the closing or opening of the product loading door for supplying products, thereby disconnecting the power supply to the temperature controller 3. The purpose is to stop the compressor 1 and the refrigerator fan 4 at the same time to prevent the cold air inside the refrigerator from escaping to the outside, and to reduce power consumption during this time.

That is, the present invention has a refrigeration cycle in which the surrounding area is cooled in an evaporator 2 using refrigerant from a compressor 1, and a temperature controller 3 that becomes operational when power is supplied.
A product vending machine equipped with a freezer that stops an internal fan 4 depending on the internal temperature and time interval, guides the refrigerant directly to the evaporator 2 with a solenoid valve 5, or defrosts it with a heater 6. A refrigerated vending machine in which contacts 7 and 7' which are closed when the product loading door for supplying the product is closed and opened when the door is opened are inserted into the temperature controller 3 and the power supply circuit to the internal fan. We aim to provide the following.

[Effect]

When the product loading door is open, contact 7 is open, temperature controller 3 is inactive, and contact 7'
When the refrigerator is opened, the fan inside the refrigerator also stops, preventing the cold air inside the refrigerator from escaping to the outside.

〔Example〕

As shown in the circuit diagram of FIG. 1, the embodiment of the refrigerated vending machine of the present invention has a power transformer 11 that supplies power to the temperature controller 3 in the conventional circuit.
A contact 7 which is closed when the product loading door is closed and opened when the product loading door is opened is inserted into the power supply circuit.

If you open the product loading door now, the contact 7 will open and the power to the temperature controller 3 will be cut off and it will be in an inoperable state.
When the contact 12 of the compressor 1 is opened, the compressor 1 is stopped. In this case, the internal fan 4 is also stopped by the opening of the contact 7' which interlocks with the contact 7, thereby preventing cold air from escaping to the outside.

When the product loading is completed and the product loading door is closed, the contacts 7 and 7' are closed and the temperature controller 3 enters the operating state, but at this time the temperature inside the refrigerator reaches the preset temperature (for example -5°C). ) or more, contact 13
will start defrosting instead. The release is performed by a timer or sensor built into the temperature controller.

[Effect of idea]

As described above, according to the present invention, cold air does not escape when the door is opened, which greatly contributes to the energy saving of this type of refrigeration system.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of an embodiment of a refrigerated vending machine according to the present invention, Fig. 2 is a defrosting circuit diagram using a high temperature gaseous refrigerant in a conventional refrigeration cycle, and Fig. 3 is a conventional refrigeration circuit diagram. It is an electric circuit diagram in the machine. The symbols shown in the drawings indicate the following. 1: Compressor, 2: Evaporator, 3: Temperature controller,
4: Internal fan, 5: Solenoid valve, 6: Heater, 7:
Contact, 7': Contact linked to 7, 8: Condenser,
9: Capillary reach tube, 10: Power supply, 11:
Transformer, 12: Contact, 13: Contact.

Claims (1)

[Scope of utility model registration request] It has a refrigeration cycle in which the surrounding area is cooled by an evaporator 2 using refrigerant from a compressor 1, and a temperature controller 3 that becomes operational when power is supplied controls an internal fan 4 according to the internal temperature and time interval. In a product vending machine equipped with a freezer that stops and directs the refrigerant to the evaporator 2 with a solenoid valve 5 or defrosts it with a heater 6, when the product loading door for supplying the product is closed, contact 7 that closes and opens when open;
7' is inserted into the temperature controller 3 and the power supply circuit for the refrigerator fan 4 and the heater 6 or the solenoid valve 5, and the temperature controller switches the power supply to the refrigerator fan 4 to the heater at a temperature higher than a preset temperature. 6 and a switch 13 for switching between the electromagnetic valves 5 and 5, and a switch 12 connected to the compressor for stopping the compressor 1 when the temperature controller 3 is de-energized.