JPS6199075A - Cooling device for vending machine, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooling device for vending machines, showcases, etc.

Conventional configuration and its problems In recent years, energy conservation in vending machines has become important, especially regarding the cooling device, which accounts for the largest amount of power consumption.
The most commonly used method is to control the internal fan motor to operate the cooling system efficiently.

The conventional cooling device for a vending machine as described above will be explained below with reference to FIGS. 4 to 6. Reference numeral 1 denotes a main body of the vending machine made of a heat insulating wall, and a storage chamber 2 is formed inside the main body 1.

A compressor 3, a condenser 4, a condenser cooling fan motor 6, and the like are arranged at the lower part of the main body 1 to constitute the high-pressure side of the cooling system. Further, the storage chamber 2 is provided with a product storage shelf 6, and an evaporator element and an internal fan motor 8 are arranged in the lower part of the storage chamber 2 to constitute the low-pressure side of the cooling system. Furthermore, a thermostat 9 is installed to detect the temperature of the evaporator 7 and keep the storage chamber 2 at a constant temperature. moreover,
A delay timer 10 whose delay time can be manually adjusted is connected in series with the thermostat 9. Still, the condenser cooling noar/motor 6 and the compressor 3 are each connected in series with the thermostat 9.

Furthermore, the contact 11 of the delay timer 10 and the internal fan motor 8 are connected in series.

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

First, when the temperature of the storage 2 is high and the contact of the thermostat 9 is closed, the compressor 9 and the condenser cooling fan motor 5 are operated, and the delay timer 10 is also energized, its contact 11 is turned ON, and the inside of the refrigerator is The fan motor 8 operates and the storage chamber 2 is cooled. Further, when the thermostat 9 is turned off, the compressor 9 and the condenser cooling fan motor 6 are stopped, and the energization of the delay timer 10 is also stopped. However, since the contact 11 of the delay timer turns off TD minutes after the delay timer stops energizing, the internal fan motor 8 rotates for TD minutes after the thermostat 9 turns off, and then stops. Furthermore, when the temperature of the thermostat 9 rises and it is turned on, the compressor 9, the condenser cooling fan motor 5, and the internal fan motor 8 are operated again, and thereafter the thermostat 9 similarly operates intermittently to cool the storage room.

However, with the above configuration, the outside temperature and storage room 2
Even if the load changes and the temperature change curve of the evaporator 7 changes, the delay time TD is always constant and the internal fan motor 8 is turned off.
The temperature t of the evaporator 7 changes greatly during the F operation, which has the disadvantage that the temperature in the storage chamber cannot be kept constant.

Purpose of the Invention In view of the above-mentioned drawbacks, the present invention provides a cooling device for vending machines, etc., which can achieve efficient energy saving while keeping the temperature of the storage room constant even when the outside temperature and the load on the storage room change. It is something.

Structure of the Invention In order to achieve this object, the cooling device for vending machines, etc. of the present invention detects the temperature of the evaporator and controls the compressor, etc.
The first thermostat of the contact has a characteristic that the operating temperature is within the range of the first thermostat (high temperature OFF temperature is lower than the first thermostat, low temperature ON temperature is higher than the first thermostat) and detects the temperature of the evaporator. It consists of a second thermostat, which controls the internal fan motor with its contacts, and a relay that controls the internal fan motor with its contacts.With this configuration, the compressor, etc. is controlled by the low-temperature OFF contact of the first thermostat, and the high-temperature OFF contact of the first thermostat. The internal fan motor is operated in a delayed manner using the second thermostat, the second thermostat, and the relay, and the second thermostat detects the temperature of the evaporator and stops the internal fan motor, thereby keeping the temperature inside the storage room constant. This will help save energy.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Structures that are the same as those of the prior art will be given the same reference numerals and detailed explanations thereof will be omitted.

In the figure, 12 is the first thermostat, and the common terminal C1
is connected to one end of the power supply. And compressor 3. Each of the condenser cooling fan motors 5 is electrically connected in series with the low temperature OFF contact of the first to most tuft 12 .

13 is a second thermostat having a high temperature OFF contact;
The common terminal C is the height of the first thermostat 12 @OF
It is connected to F contact H1. 14 is a relay, one end of which is connected to the high temperature OFF contact H2 of the second thermostat 13;
The other end is connected to a power source. 15 is a contact of the relay 14, the No contact is connected to the high temperature OFF contact H1 of the first thermostat 12, and the NC contact is connected to the first thermostat 12.
The common terminal C3 is connected to the low temperature OFF contact L1 of the refrigerator fan motor 8.

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

First, when the temperature of the storage compartment 2 is high and the contact of the first thermostat 12 is at the low temperature OFF contact L1, the compressor 3 and the condenser cooling fan motor 6 are operated. In addition, since the contact of the first thermostat 12 is at Ll and the relay 14 is not energized, the relay contact 16 is recessed to the NC side, and the internal fan motor 8 is operated through the low temperature OFF contact L1 of the first thermostat 12. is cooled. J where the low temperature OFF contact L4 of the first thermostat 12 turns OFF-
:l Before, the IE 2 + -% stat 13 is turned ON. (In other words, the low-temperature ON temperature t2L of the second thermostat 13 is set higher than the low-temperature OFF temperature t1L of the first thermostat 12.) Then, when the low-temperature OFF contact L1 of the first thermostat 12 is turned off, the compressor 3 Since the fan motor 5 for cooling the container is stopped and the contact of the second thermostat 13 is ON, the relay 14 is energized and its contact 15 is N.

The internal fan motor 8 is energized from the high temperature OFF contact H1 of the first thermostat through the No contact of the relay contact 15 and continues to rotate. When the temperature of the evaporator rises to t2H, the second thermostat 13 changes to 0FFj,...
1. Since the power supply to the I-sea 14 is cut off and the relay contact 15 moves to the NC side, the internal fan motor 8 stops at this point. When the temperature of the evaporator 7 further rises to tlH, the contact of the first thermostat 12 switches to the low temperature OFF contact L.
1, compressor 12, condenser cooling fan motor 5
is driven. Thereafter, the storage chamber 2 is maintained at a constant temperature by intermittent operation in the same manner.

As described above, according to this embodiment, the first thermostat 1
2. A delay circuit is formed by the second thermostat 13, the relay 14, and its contacts 15, and the internal fan motor 8 can be controlled with a delay, and the internal fan motor 8 can be stopped by the second
Since the temperature of the evaporator 7 can be directly detected and controlled by the thermostat 13, effective energy saving can be achieved while keeping the temperature of the storage chamber 2 constant despite fluctuations in the outside temperature and the load amount of the storage chamber 2. Can be done. Since the operating temperature of the first thermostat 12 and the second thermostat 13 can be adjusted separately, the temperature inside the refrigerator can be adjusted according to market conditions such as sales volume.

Furthermore, by setting the OFF temperature of the second thermostat 13 to 1° C. or higher, the internal fan motor 8 can be operated until the defrosting of the evaporator 7 is completed, thereby ensuring defrosting.

Effects of the Invention As described above, by providing the first thermostat, the second thermostat, and the relay, the present invention performs delay control of the fan motor inside the refrigerator to effectively save energy, and also allows the storage room temperature to be adjusted to the outside temperature or the storage room temperature. It is possible to maintain a constant temperature at all times even when the load in the room changes, and this has great practical effects. .

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of a cooling device for a vending machine according to an embodiment of the present invention, Fig. 2 is a block diagram showing the cooling device of Fig. 1, and Fig. 3 shows the operation of the cooling device of Fig. 1. Flowchart diagram, Figure 4 is a configuration diagram showing a conventional vending machine cooling device,
6 is an electric circuit diagram of FIG. 4, and FIG. 6 is a flowchart showing the operation of FIG. 5. 3... Compressor, 4... Condenser, 7... Evaporator, 8... Internal fan motor, 12...
... 1st thermostat, 13. River... 2nd thermostat, 14. River... Relay. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 1? Figure 2? 〆 Q Figure 3 OFF ON
oF IN Figure 4/z2 Figure 5 Figure 6

Claims (1)

[Claims] A cooling system consisting of a compressor, a condenser, an evaporator, etc., an internal fan motor installed in a storage room in which the evaporator is installed and which forcibly circulates cold air, and a cooling system that operates the compressor at a low temperature
a first thermostat controlled by an FF contact; and a second thermostat connected in series with the high temperature OFF contact of the first thermostat.
a thermostat and a high temperature OF of the first thermostat;
A cooling device for a vending machine or the like, comprising an F contact and a relay that is connected in series with the second thermostat and controls the internal fan motor with the contact.