JPH07301478A - Cooler for vending machine - Google Patents

Abstract

PURPOSE:To maintain cooling performance by altering the capacities of a fan motor for cooling a condenser and a fan motor for expediting evaporation in response to the refrigerant pressure of a condenser outlet. CONSTITUTION:An evaporator 7, an indoor fan motor 8 for cooling the containing chamber 2 of a body at a predetermined temperature are provided in the chamber 2, and a compressor 3, a condenser 4, a fan motor 5 for cooling the condenser, evaporation expediting unit 6 for evaporating drain in the chamber, a fan motor 9 for expending evaporation, and pressure detecting means 10 for detecting the refrigerant pressure of the outlet of the condenser are provided in a machine room. The cooler for a vending machine comprises an arithmetic processor for storing preset pressure to compare the pressure detected by the means 10, and control means for controlling the motors 5, 9 according to a signal from the processor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an automatic vending machine, which cools the inside of a container for storing products and sells the cooled products.

[0002]

2. Description of the Related Art In recent years, a cooling device for a vending machine is a system for improving the cooling efficiency of a compressor by changing the installation environment of the vending machine, as disclosed in Japanese Utility Model Laid-Open No. 63-104968. Has come to be adopted.

An example of a conventional cooling device for a vending machine will be described below with reference to FIG.

In FIG. 4, reference numeral 1 is a main body having a heat insulating wall, and a storage chamber 2 is formed in the upper part inside. 3 is a compressor, 4 is a condenser, 5 is a fan motor for cooling the condenser, 6 is an evaporation promoter for collecting and evaporating the waste water in the storage chamber 2,
Reference numeral 7 is an evaporator for evaporating and cooling the refrigerant sent from the compressor 3, and 8 is an internal fan motor, which is provided in a machine room below the storage room 2.

The operation of the conventional cooling device for a vending machine configured as described above will be described below.

The refrigerant compressed by the compressor 3 is transferred to the condenser 4
And the fan motor 5 for cooling the condenser, and the air in the storage chamber 2 is evaporated by the evaporator 7. The air cooled by the evaporator 7 is agitated by the internal fan motor 8 to cool the storage chamber 2.

[0007]

However, in the conventional cooling device having the above-described structure, the condenser cooling fan motor 5 is used regardless of whether the refrigerant pressure at the outlet of the condenser 4 is high or low. Has the same ability to stir and cool air, so that when the pressure is low, there is a problem in that the condenser 4 becomes supercooled and the evaporator 7 becomes insufficient in gas, resulting in insufficient cooling. .

According to the present invention, the refrigerant pressure at the outlet of the condenser is changed to a high value and a low value by changing the capacities of the condenser cooling fan motor and the evaporation promoting fan motor. It is an object of the present invention to provide a cooling device for a vending machine that can maintain cooling performance without causing supercooling in the condenser even at low pressure.

[0009]

In order to achieve the above object, a cooling device for a vending machine according to the present invention includes an internal fan motor, a compressor, a condenser for cooling an evaporator and a storage chamber to a constant temperature, A condenser cooling fan motor, an evaporation promoter that collects and evaporates the waste water in the storage chamber, an evaporation promotion fan motor, a pressure detection unit that detects the refrigerant pressure at the outlet of the condenser, and stores a preset pressure, An arithmetic processing unit for comparing with the pressure detected by the pressure detecting unit, and a control unit for controlling the condenser cooling fan motor and the evaporation promoting fan motor by a signal from the arithmetic processing unit.

[0010]

According to the present invention, with the above configuration, the refrigerant pressure at the outlet of the condenser is detected by the condenser pressure detecting means, and this pressure is compared with the predetermined pressure by the arithmetic processing section.
The control means operating by the comparison can control the operation of the condenser cooling fan motor and the evaporation promoting fan motor in response to the signal from the arithmetic processing section, and improve the cooling efficiency. You can

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A cooling device for an automatic vending machine according to an embodiment of the present invention will be described below with reference to FIGS.

1 and 2 show a cooling device for an automatic vending machine according to an embodiment of the present invention, in which the same components as those described as the conventional example are designated by the same reference numerals and detailed description thereof will be given. The description is omitted.

Reference numeral 9 denotes an evaporation-promoting fan motor provided in the machine room, which enhances the capacity of treating wastewater in the refrigerator. Reference numeral 10 is a pressure detecting means for detecting the pressure of the refrigerant at the outlet of the condenser 4. Reference numeral 11 is a setting means for setting the pressure for operating the two fan motors 5, 9. Reference numeral 12 stores the pressure preset by the setting means 11, and the pressure detecting means 10 stores the pressure.
An arithmetic processing unit that stores the pressure detected in step S1 and compares it with the pressure set by the setting unit 11 controls a first relay 14 and a second relay 15 by a signal from the arithmetic processing unit 12. The control means 16 is a contact of the first relay 14, and the condenser cooling fan motor 5 and the evaporation promoting fan motor 9 are connected in parallel between the power supply lines. Reference numeral 17 is a contact of the second relay 15.

The operation of the cooling device for the vending machine configured as described above will be described with reference to FIG.

In step 1, since the condenser cooling fan motor 5 and the evaporation promoting fan motor 9 are controlled, a predetermined pressure A serving as a reference of the pressure detected by the pressure detecting means 10,
B is set by the setting means 11.

Step 2 is a high pressure at which the pressure detected by the pressure detecting means 10 becomes equal to or higher than the pressure A set by the setting means 11, and in step 3, the first relay is performed via the control means 13. 14 and the second relay 15 are excited to open the contact 16 of the first relay 14 and the contact 17 of the second relay 15 to operate the condenser cooling fan motor 5 and the evaporation promoting fan motor 9. To do.

Step 4 is the intermediate pressure at which the pressure detected by the pressure detecting means 10 becomes equal to or higher than the pressure B set by the setting means 11, and in step 5, the first relay is performed via the control means 13. 14 and the second relay 15 are excited, the contact 16 of the first relay 14 is opened, the condenser cooling fan motor 5 is operated, and the second relay 1
The contact 17 of No. 5 is closed to stop the operation of the evaporation promoting fan motor 9.

Step 4 is a low pressure when the pressure detected by the pressure detecting means 10 becomes equal to or lower than the pressure B set by the setting means 11, and in step 5, the first relay is performed via the control means 13. 14 and the second relay 15 are excited, the contact 16 of the first relay 14 is closed to stop the operation of the condenser cooling fan motor 5, and the contact 17 of the second relay 15 is opened to promote evaporation. Fan motor 9
Drive.

As described above, according to this embodiment, the pressure detecting means 10 detects the refrigerant pressure at the outlet of the condenser 4 and sets it by comparing it with the pressures A and B arbitrarily set by the setting means 11. Only when the pressure becomes equal to or higher than A, the condenser cooling fan motor 5 and the evaporation promotion fan motor 9 are operated to accelerate the exhaust heat of the machine room to enhance the cooling effect of the compressor 3 and to improve reliability. It is possible to improve the sex.

Further, the pressure detecting means 10 detects the refrigerant pressure at the outlet of the condenser 4, and compares it with the pressures A and B arbitrarily set by the setting means 11, and is below the set pressure A and above B. At this time, by operating only the condenser cooling fan motor 5, the cooling effect of the compressor 3 can be enhanced and the reliability can be improved.

Further, when the pressure becomes equal to or lower than the set pressure B, only the evaporation promoting fan motor 9 is operated, so that the processing capacity of the waste water in the cold storage can be enhanced, and the evaporation promoting fan motor 9 can be improved. By operating only this, it is possible to prevent supercooling and prevent gas shortage in the evaporator 7.

[0022]

The cooling device for a vending machine of the present invention constructed as described above has the following effects.

An evaporator, an internal fan motor for stabilizing the temperature of the storage chamber, a compressor, a condenser, a fan motor for cooling the condenser, an evaporation promoter for collecting and evaporating the waste water in the storage chamber, and an evaporator. A fan motor for promotion, a pressure detection means for detecting the pressure of the refrigerant at the outlet of the condenser, an arithmetic processing section for storing a preset pressure and comparing it with the pressure detected by the pressure detection means, from this arithmetic processing section Is provided with a control means for controlling the condenser cooling fan motor and the evaporation promotion fan motor, the pressure detecting means detects the refrigerant pressure at the condenser outlet, and the detected pressure is the set pressure. When the pressure is equal to or higher than the two set pressures arbitrarily set by the means, that is, when the pressure is high, the condenser cooling fan motor and the evaporation promoting fan motor are operated so that Enhance the cooling effect of the compressor, thereby improving the reliability.

The pressure detecting means detects the refrigerant pressure at the outlet of the condenser, and when the detected pressure is between the two pressures set, that is, when the pressure is medium, the condenser cooling fan motor is operated. By stopping the operation of the evaporation promoting fan motor, the cooling effect of the compressor can be enhanced and the reliability can be improved.

Further, the pressure detecting means detects the refrigerant pressure at the outlet of the condenser, and when the detected pressure is equal to or lower than two set pressures, that is, when the pressure is low, the condenser cooling fan motor is operated. And the fan motor for evaporation promotion is operated to prevent supercooling in the condenser, it is possible to prevent gas shortage in the evaporator, and reliability can be improved. Wastewater treatment capacity can be improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a cooling device for a vending machine according to an embodiment of the present invention.

FIG. 2 is a block diagram of a cooling device of the same vending machine.

FIG. 3 is a flowchart of a cooling device of the same vending machine.

FIG. 4 is an explanatory view of a conventional vending machine cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Storage chamber 3 Compressor 4 Condenser 5 Condenser cooling fan motor 6 Evaporation promoter 7 Evaporator 8 Internal fan motor 9 Evaporation promotion fan motor 10 Pressure detection means 12 Arithmetic processing unit 13 Control means

Claims (1)

[Claims] 1. An evaporator, an internal fan motor for maintaining a temperature in a storage chamber, a compressor, a condenser, a fan motor for cooling a condenser, an evaporation promoter for evaporating waste water in the storage chamber, an evaporation promotion fan motor, Pressure detection means for detecting the pressure of the refrigerant at the outlet of the condenser, an arithmetic processing section for storing a preset pressure and comparing it with the pressure detected by the pressure detection means, the condenser according to a signal from this arithmetic processing section A cooling device for a vending machine, comprising control means for controlling the cooling fan motor and the evaporation promoting fan motor.