JPS6033502Y2 - Demand control system for vending machines - Google Patents

Description

[Detailed description of the invention] The present invention relates to temperature control of vending machines, and the set temperature of the temperature controller can be adjusted when the stored items require cooling, especially when the sales volume is low such as at night. The purpose is to reduce power consumption by setting the temperature slightly higher as long as there is no problem with the quality of the stored items, or slightly lower if the stored items require heating.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, 1 is a temperature detection circuit, and 2 is a temperature detection thermistor placed in an article storage chamber (not shown) in the vending machine.

The output 2a of this thermistor 2 is one input terminal of the first and second comparators 3 and 4, and the other input terminals 3b and 4b are resistors for applying a voltage suitable for each set temperature. 5.6.7.8.9 are connected,
Furthermore, a transistor 10 is connected in parallel to the resistor 7.

The comparator 3 is connected to the first and second set temperatures (for example, 6°C
and 8° C.), and the comparator 4 is set to a third set temperature (for example, 12° C.).

This first set temperature is a temperature suitable for selling the stored articles.

Further, the second set temperature is set slightly higher than the first set temperature, and the temperature is not set so high as to affect the quality of the stored articles.

Further, the third set temperature is a temperature at which it is detected that the temperature inside the refrigerator has increased due to new replenishment of articles.

And the first comparator 3 has a transistor 10 that is ONE.
, when the temperature is 6°C or higher, a high level is output from the output terminal 3c, and when the temperature is 6°C or lower, a high level is output from the output terminal 3c.
It outputs a high level from its output terminal 3c when the temperature is below 8°C.

Further, the second comparator 4 outputs a low level signal when the temperature is 12'C or more, and a high level signal when the temperature is 17C or less, to its output terminal 4.
It is issued from c.

The transistor 10 is turned on by a signal from the gate circuit 11.
N.

A switching transistor that is turned off constitutes a switching means that switches between the first set temperature and the second set temperature.

12 is ON and OF by the output of the first comparator 3
A relay coil 13 is connected to the load of this transistor.

13a is a relay switch that is turned on when the relay coil 13 is energized, and is connected to a heat source 14 such as a refrigerator or a heater.

15 is its power source.

16 is, for example, M518 sold by Mitsubishi Electric.
A timer 17 of 45L is provided for a predetermined time (for example, 1
This is a signal device that determines whether or not there are any sales results within a period of time.

A switch 18 that is turned on by a bend signal is connected to the reset terminal 17a of the timer 17, as shown in FIG.

Reference numeral 19 is a CR circuit consisting of a capacitor 19a and a resistor 19b, and is connected to the CR input terminal 17b of the timer 17.

17c is an output terminal, which is the input terminal 11b of the gate circuit 11.
It is connected to the.

Further, the other input terminal 11a of the gate circuit 11 is connected to the output terminal 11a of the second comparator 4.

Next, the operating state in such a configuration will be explained.

Timer 1 is used when sales occur relatively frequently, at least once every predetermined time (one hour), such as during the daytime.
7 is reset each time a sale is made by the switch 18, the timer 17 counts up to a predetermined time T (1 hour).
The output of the timer remains at a low level as shown in FIG. 2, and the output of the gate circuit 11 is not output through the second
A low level is output regardless of the output of the comparator 4, and the transistor 10 is in the ON state.

Therefore, the temperature inside the refrigerator is detected by the thermistor 2, and by the comparator 3, the relay coil 13 is energized and the heat source (freezer) 14 is activated when the temperature is above the first set temperature, that is, 6°C, and the temperature is below 6°C. At this time, the operation of the heat source 14 is stopped.

Next, if the next sale is not performed even after the set time T has elapsed since the previous sale, such as at night, the output of the timer 17 becomes a high level as shown in Figure 2, and once the high level is output, it is reset. The high level remains until a high level signal is input to the terminal 17a.

Therefore, one terminal 11b of the gate circuit 11 is held at a high level.

At this time, if the temperature inside the refrigerator is lower than the third set temperature 12'C, the output of the comparator 4 becomes high, and the gate circuit 11
The output becomes high level and turns off the transistor 10.

Therefore, the temperature inside the refrigerator is detected by the thermistor 2, and the comparator 3 sets the second set temperature, that is, when the temperature is higher than 8°C, the relay coil 13 is excited and the heat source (freezer) 14 is activated, and when the temperature is lower than 8°C. At this time, the operation of the heat source 14 is stopped.

In this way, if there are no sales within a certain predetermined time, the temperature will be set slightly higher. However, when the temperature inside the refrigerator rises due to filling of sales products, etc. 3, the output of the comparator 4 becomes low level, and the input terminal 11a of the gate circuit 11 becomes low level.

Therefore, if no sales are made for a predetermined period of time, that is, even if the output of the timer 17 is at a high level and the input terminal 11b of the gate circuit 11 is at a high level, the output of the gate circuit 11 will be at a low level and the transistor 10 will be turned on. Therefore, the heat source 14 is controlled to be turned on and off at the first set temperature of 6°C.

Note that when the heat source is turned on at the second set temperature of 8°C,
The OFF operation continues until a reset signal, that is, a vent signal, is input to the timer 17.

In the illustrated embodiment, the goods to be sold are exemplified as those that require cooling, but conversely, for items that require heating, the second set temperature is slightly lower than the first set temperature, and the second set temperature is lower than the first set temperature. This is to set the third set temperature.

As mentioned above, the present invention changes the set temperature inside the refrigerator while checking the sales situation within a predetermined period of time, and at night when sales are low, the set temperature is changed to one that consumes less power from the heat source. In addition, if the second set temperature exceeds the allowable range, the heat source is forced to operate and the temperature returns to the first set temperature, thereby preventing any adverse effects on the stored products. This has excellent effects such as reduction in power consumption.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing the operation of the signal generator. 1...Temperature detection circuit, 2...Thermistor, 3゜4...Comparator (temperature setting means)
, 10, 12...transistor, 13...
...Relay coil, 14...Heat source, 17...
···timer.

Claims (1)

[Scope of utility model registration request] A heat source that cools or heats the stored items, a first set temperature that is a temperature suitable for sale, and an operating temperature that is different from the first set temperature and that does not affect the quality of the stored items. The heat source is operated at a second set temperature where the operation interval is set longer than the first set temperature, and a third set temperature at which the internal temperature deviates significantly from the first set temperature and the second set temperature. temperature setting means for operating the heat source at the first set temperature when the temperature reaches the first set temperature; switching means for operating the heat source at a second set temperature when the heat source is not being operated.