JPH0540855Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a hot storage case in which a hot plate equipped with an electric heater is arranged.

(b) Conventional technology The refrigerated case with heating according to Utility Model Publication No. 52-39243 (JPC.70B1) has a heater installed in the shelf,
This heater's control thermostat,
A configuration is shown in which an internal high temperature thermostat and a limit thermostat are electrically connected in series.

(c) Problems to be solved by the invention According to the above-mentioned conventional technology, the inside of the refrigerator is maintained at a predetermined temperature by controlling the supply of electricity to the heater by opening and closing the heater control thermostat. Even if you try to quickly raise the temperature of the refilled product in the refrigerator to the specified temperature in a short time, the heater control thermostat will open even though the limit thermostat and the high temperature thermostat in the refrigerator are closed. As a result, replenishment products could not be heated quickly, resulting in a problem of poor sales turnover of stored products.

(d) Means for solving the problem In order to solve the above problem, this proposal provides a hot plate 7 disposed in the refrigerator interior 6, an electric heater 8 provided on this hot plate, and a They are connected in series to form a first series circuit 12, and have an opening operating temperature and a closing operating temperature lower than the opening operating temperature, and open when the temperature rises to the opening operating temperature. A first temperature switch 9 that closes when the temperature drops to the closing operating temperature.
is connected in _series with the electromagnetic relay A second temperature switch 10 is set to a closing operating temperature lower than the operating temperature, opens when the temperature rises to the opening operating temperature, and closes when the temperature decreases to the closing operating temperature.
, a second normally closed contact X _a2 of the electromagnetic relay connected in parallel to the first temperature switch 9, and a rapid heating switch 16 that energizes the electromagnetic relay. To provide a warm storage case 1 whose operating temperature is set to be higher than the opening operating temperature of a first temperature switch 9.

(E) Action By pressing the rapid heating switch 16, the first
It is possible to start energizing the electric heater 8 through the second normally open contact X _a2 of the electromagnetic relay X, regardless of whether the electric heater 8 is energized or de-energized. The second temperature switch 10, which is closed when the temperature is below the opening temperature of the first temperature switch, can continue energizing the heater until the temperature rises to the opening temperature.

(f) Examples Embodiments of the present invention will be described below based on the drawings.

1 is a heated storage case installed at the counter of a store, etc., and has both upper and lower plates 2 and 3 made of heat insulating plates.
It is composed of a plurality of transparent plates 4 and 5 arranged on the circumferential side, and an interior 6 of the refrigerator is formed by each of these plates. 5 of the transparent plates 4 and 5 acts as a door, and is opened and closed when taking out and taking out products such as canned coffee. Reference numeral 7 denotes a metal hot plate which is placed horizontally in the refrigerator interior 6 and serves as a shelf or bottom plate, and on the back side there are an electric heater 8 arranged in a spiral or meandering manner, a first temperature switch 9, and a second temperature switch 9. A temperature switch 10 is provided. Said first
The temperature switch 9 opens the contact piece 9A when the upper limit value, for example 75°C, is reached, and closes the contact piece 9A when the lower limit value, for example, 55°C, is reached, and the second temperature switch 10 closes the contact piece 9A when the upper limit value, for example, 105°C is reached. Open the contact piece 10A,
When the lower limit value, for example, 75° C. is reached, the contact piece 10A is closed, and the closing operation temperature of the second temperature switch 10 is set to be higher than the opening operation temperature of the first temperature switch 9. That is, the electric heater 8 is energized from the closing operation of the first temperature switch 9 to the opening operation of the second temperature switch 10.

FIG. 1 shows an electric circuit, where 11 is an operation switch, 12 is a first series circuit consisting of the electric heater 8, a first temperature switch 9, and a first safety device 13 consisting of a fuse, and 14 is an electromagnetic relay. X, the first normally open contact that serves as the self-holding contact of this electromagnetic relay
a second series circuit connected in parallel to the first series circuit 12 _, comprising
X _a2 is the electromagnetic relay X connected in parallel to the first temperature switch 9 and the first safety device 13.
A second normally open contact 16 is a pusher connected in series with the electromagnetic relay X and in parallel with the first normally open contact X _a1 , the second temperature switch 10 and the second safety device 15. Button-type rapid heating switch,
PL1 and PL2 are pilot lamps.

The electric heater 8 is energized by turning on the operation switch 11, and by opening and closing the first temperature switch 9, the temperature of the hot plate 7 reaches the third temperature.
As shown in the figure, the temperature is maintained within the set temperature T range. During this control, if you press the rapid heating switch 16,
_Through this switch _, electromagnetic _relay Retained. In this state, even if the first temperature switch 9 is opened, the electric heater 8 is energized through the second normally open contact X _a2 , and in this state, the hot plate 7 is
As shown in the figure, the temperature TH is higher than the set temperature T.
maintained within the range. This electric heater 8 causes the air temperature inside the refrigerator 6 to have the characteristics shown in FIG. 4A.
Incidentally, FIG. 4B shows a curve when the first temperature switch 9 reaches a predetermined temperature.

Therefore, according to such a configuration, when a product such as canned coffee is stored in the chamber 6 and you want to heat it quickly, or when you want to heat a replenishment product quickly, you can press the rapid heating switch 16 to turn on the first heating switch 16. Temperature switch 9
Regardless of the opening operation of the first temperature switch 9, the closing operation temperature is higher than the opening operation temperature of the first temperature switch 9, the second temperature switch 9 is closed at a temperature below this opening operation temperature, and the second temperature switch 9 opens when the temperature rises to the opening operation temperature. temperature switch 1
0, the closing operation of the first normally open contact X _a1 and the second normally open contact X _a2 of the electromagnetic relay By heating the hot plate 7 to a temperature TH higher than a certain set temperature T, the stored products can be raised to their optimum temperature in a short time. In other words, as the heating temperature of the hot plate 7 is rapidly raised, the heat followability of the product placed on the hot plate improves, and the heating time of the product itself becomes faster, leading to early sales of the product. It turns out.

(g) Effects of the invention According to the invention described above, by pressing the rapid heating switch, the second normally open contact of the electromagnetic relay is activated even when the electric heater is not energized or energized through the first temperature switch. is closed, and then the electromagnetic relay is energized by the second temperature switch, which is closed when the closing operation temperature is higher than the opening operation temperature of the first temperature switch and lower than the opening operation temperature of the first temperature switch. By keeping the second normally open contact closed, the electromagnetic heater continues to be energized until the second temperature switch is opened, and as a result, the temperature of the air inside the refrigerator reaches a predetermined temperature within a short period of time. Since the product can be raised, the heating time for replenishment products is shortened, and the turnover rate associated with product sales is improved.

[Brief explanation of the drawing]

The drawings all show examples of the hot storage case according to the present invention, and Fig. 1 is an electric circuit diagram, Fig. 2 is an overall vertical sectional view, Fig. 3 is a temperature characteristic diagram of a hot plate, and Fig. 4 is a diagram showing the temperature characteristics of a hot plate.
The figure shows the temperature characteristics of the air inside the refrigerator. 6... Inside the refrigerator, 7... Hot plate, 8... Electric heater, 9... First temperature switch, 10...
second temperature switch, 12...first series circuit;
14... Second series circuit, 16... Rapid heating switch, X... Electromagnetic relay, X _a1 ... First normally open contact, X _a2 ... Second normally open contact.

Claims (1)

[Scope of utility model registration request] A hot plate disposed inside the refrigerator, an electric heater provided on the hot plate, and a first series circuit connected in series with the electric heater, and having an opening operating temperature and a closing temperature lower than the opening operating temperature. an operating temperature is set, a first temperature switch opens when the temperature rises to the opening operating temperature, and closes when the temperature decreases to the closing operating temperature;
A second series circuit is connected in series with an electromagnetic relay and a first normally open contact of the electromagnetic relay to form a second series circuit in parallel with the first series circuit, and has an opening operation temperature and a closing operation lower than the opening operation temperature. a second temperature switch, which opens when the temperature rises to the opening operating temperature and closes when the temperature falls to the closing operating temperature; and a second temperature switch in parallel with the first temperature switch. a second normally closed contact of the electromagnetic relay connected to the electromagnetic relay; and a rapid heating switch that excites the electromagnetic relay, and sets the closing operating temperature of the second temperature switch to be equal to or higher than the opening operating temperature of the first temperature switch. A warm storage case that is characterized by: