JPH06341750A - Hot and cold storage showcase - Google Patents

Abstract

PURPOSE:To treat the trouble of a temperature detecting means and prevent the abnormal rise of a temperature by a method wherein an electric heater for hot storage and a plurality of temperature detecting means are arranged in an upper storage chamber in a hot and cold storage showcase and the exciting of the electric heater is controlled so as to be put ON/OFF in accordance with the heights of respective detecting temperatures. CONSTITUTION:When a power supply switch 41 is put ON, a refrigerating cycle is operated in accordance with the ON of a thermocontrol switch 44 whereby the lower storage chamber in a hot and cold storage showcase is cooled. When a damper for both of upper and lower storage spaces is closed, respective contacts 45a, 45b of a hot and cold storage switching switch 45, operated in conjunction with the closing of the damper, are put ON whereby a thermocontroller 50 is operated. In this case, respective thyristors 61, 62 are put ON/OFF based on respective temperature sensors 21, 31 and respective electric heaters 20, 30 are operated and/or stopped whereby the upper storage chamber is used as a hot storage chamber. When the temperature sensor 21, for example, becomes faulty, the other thermostat 22 is put OFF whereby the excitation of the electric heater 20 can be intercepted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot / cold showcase for storing canned beverages and foods.

[0002]

2. Description of the Related Art A storage room whose four sides are covered with transparent glass plates is divided into upper and lower compartments, and the upper storage room is switched to a refrigerating room or a heating room as needed, and the lower storage room is used as a refrigerating room.・ There is a refrigerated showcase.

In this hot / cold storage showcase, an electric heater for heating and a thermostat as a temperature detecting means are provided on the shelf of the upper storage room, and electric power to the electric heater is controlled to be turned on / off by opening / closing the thermostat. , Keep the temperature of stored goods at the optimum condition. Generally, for canned beverages such as coffee, soup, and soup powder, 50 ℃ ~ 60
A temperature of ° C is considered optimal.

Further, in this temperature control, it is usual to provide an auxiliary thermostat so as to be safe even if the thermostat fails. As the auxiliary thermostat, one having an ON / OFF operating point higher than that of the main thermostat, for example, about 65 ° C. to 75 ° C. is used so that the main thermostat operates when the main thermostat fails and the temperature continues to rise.

[0005]

However, the storage temperature is 65%.
If the temperature exceeds 70 ° C, the contents of the coffee are likely to be altered, and if the temperature exceeds 70 ° C, the can (metal) is hot and cannot be held.

The present invention takes the above circumstances into consideration,
In the hot and cold storage showcases of the first to fourth inventions, abnormal temperature rise can be suppressed even if the temperature detection means fails, which improves safety and also causes deterioration of stored products and hot cans. The purpose is to prevent problems such as being unable to carry.

In the hot and cold storage showcase of the fifth aspect of the invention, abnormal temperature rise can be suppressed even if the temperature detecting means fails, which improves the safety and the quality of stored goods and the cans become hot. The purpose is to prevent problems such as being unable to hold it, and to secure a plurality of temperature control rooms with adjustable temperature.

In the hot and cold storage showcase of the sixth invention, an abnormal temperature rise can be suppressed even if the temperature detecting means fails, which improves the safety and the quality of stored goods and the cans become hot. The purpose is to prevent problems such as being unable to hold the battery, and to improve the durability and reliability of parts related to temperature control.

[0009]

In the hot / cold storage showcase of the first invention, a storage compartment whose side surface is covered with a transparent plate is partitioned into upper and lower parts, and the upper storage compartment is appropriately switched to a refrigerating compartment or a heating compartment. When using the lower storage room as a refrigerating room, a shelf board provided in the upper storage room, an electric heater for heating provided on the shelf board, and a first temperature detection provided on the shelf board Means, first control means for controlling ON / OFF of energization of the electric heater according to the temperature detected by the first temperature detecting means, second temperature detecting means provided on the shelf board, and the first temperature detecting means.
Second control means having an off control point and an on control point lower than those of the control means and controlling on / off of energization of the electric heater according to the temperature detected by the second temperature detection means is provided.

The hot and cold storage showcase of the second invention is the first invention, wherein there are a plurality of shelves, and an electric heater, a first temperature detecting means, and a second temperature detecting means are provided for each of these shelf boards. It was

In the hot and cold storage showcase of the third invention, in the first invention, the ON control point of the second control means is set to room temperature (30 ° C.) or lower. According to a fourth aspect of the present invention, in the first aspect of the present invention, in the first aspect, the first temperature detection means is a temperature sensitive resistance element, and the first temperature control means is provided with a switching element in a current passage to an electric heater. A bimetal thermostat that opens and closes the switching element according to the temperature sensed by the temperature-sensitive resistance element and that senses temperature and opens and closes contacts is used as the second temperature detecting means and the second temperature control means.

In the hot and cold storage showcase of the fifth aspect of the invention, the storage chamber whose side surface is covered with a transparent plate is partitioned into upper and lower parts, and the upper storage chamber is switched to a cold storage chamber or a warm storage chamber as needed. A plurality of shelves provided in the upper storage chamber, electric heaters for heating provided on these shelves, and first temperature detecting means provided on each of the shelves. A plurality of first electric power heaters that turn on and off the electric power to each of the electric heaters according to the temperatures detected by the first temperature detecting means.
The control means, one first operating means for temperature adjustment provided in common to these first controlling means, and the ON / OFF control points of the respective first controlling means in response to the operation of the first operating means. A first temperature adjusting means that shifts to a plurality of stages;
A plurality of second operation means for temperature adjustment provided corresponding to the control means and a shift range of the ON / OFF control points by the first temperature adjustment means are set according to the operation of each of the second operation means. It has a second temperature adjusting means for independently changing each control means, a second temperature detecting means provided on each of the shelves, and an off control point and an on control point lower than those of the first control means. A plurality of second control means for controlling on / off of energization of the electric heater according to the detected temperature of each of the second temperature detecting means.

In the hot and cold storage showcase of the sixth aspect of the invention, the storage chamber whose side surface is covered with a transparent plate is partitioned into upper and lower parts, and the upper storage chamber is used by appropriately switching it to the cold storage chamber or the warm storage chamber. In a refrigerating room, a lamp for illuminating the storage room, a compressor, a condenser, a decompressor,
A refrigeration cycle for refrigeration connected to an evaporator, a condenser fan for circulating external air to the condenser, an evaporator fan for circulating air in the storage chamber to the evaporator, and at least the temperature of the lower storage chamber. A responsive thermo-control switch, a control circuit for heating that connects the compressor, the condenser fan, and the evaporator fan to a power source via the thermo-control switch, and a plurality of sheets provided in the upper storage chamber. Shelf plates, electric heaters for heating provided on these shelves, temperature fuses attached to these electric heaters, energization control elements for controlling energization to each of the electric heaters, and each of the shelves. First provided
It has a temperature detecting means, a thermo control unit for turning on / off each energization control element according to the temperature detected by the first temperature detecting means, and an off control point and a low on control point higher than the thermo control unit. However, a bimetal type thermostat provided on each of the shelves, a changeover switch having a pair of contact points, which is turned on when the upper storage room is used as a warming room, and the contact points of the changeover switch. The thermo-control unit was connected to a power source, and the electric heater was connected to the power line in the thermo-control unit through the energization control elements, the bimetal type thermostats, and the temperature fuses in series.

[0014]

In the hot and cold storage showcase of the first invention, the electric heater for heating on the shelf of the upper storage compartment is energized according to the temperature detected by the first temperature detecting means on the same shelf. First
The control means controls on and off. The shelf board further has a second temperature detecting means, and the second control means controls the on / off of the electric power supply to the electric heater according to the detected temperature of the second temperature detecting means. The energization of the second control means is performed at a higher temperature than that of the first control means, and the energization of the second control means is performed at a lower temperature than that of the first control means.

In the hot and cold storage showcase of the second invention,
Electricity is supplied to the electric heaters for heating provided on the plurality of shelves in the upper storage chamber according to the temperature of each shelf.

In the hot and cold storage showcase of the third invention,
The storage room is at room temperature (30 ° C) when electricity is supplied to the electric heater for heating.
Do the following: In the hot / cold refrigeration showcase of the fourth invention, the switching element is opened / closed according to the sensed temperature of the temperature-sensitive resistance element which is the first temperature detection means, and the opening / closing controls the energization to the electric heater. The energization of the electric heater is controlled by opening and closing the contacts of the bimetal type thermostat which is the temperature detection means and the second temperature control means.

In the hot and cold storage showcase of the fifth invention,
Depending on the detection temperature of the first temperature detection means on each shelf, the electric heater for heating on each shelf of the upper storage room is energized.
The first control means controls ON and OFF, respectively. The on / off control points are shifted in a plurality of steps according to the operation of the first temperature adjusting means, and the shift range of the on / off control points is adjusted according to the operation of the second operating means. Change each method independently. Each shelf further has a second temperature detecting means, and each second control means turns on / off the energization of each electric heater according to the temperature detected by the second temperature detecting means. The energization of the second control means is performed at a higher temperature than that of the first control means, and the energization of the second control means is performed at a lower temperature than that of the first control means.

In the hot and cold storage showcase of the sixth invention,
The operation of the compressor, condenser fan, and evaporator fan is controlled by at least a thermo control switch that responds to the temperature of the lower storage compartment. Further, when the upper storage room is used as a heating room, both contacts of the changeover switch are turned on and the thermo control unit operates. By this operation, the energization of the electric heater for heating on each shelf of the upper storage compartment is controlled to be turned on / off in accordance with the temperature detected by the first temperature detecting means on each shelf. When the upper storage room is not used as a heating room, both contacts of the changeover switch are turned off, and the power supply to the thermo control unit is cut off.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a main body of a hot / cold storage showcase, and an upper storage chamber 4 and a lower storage chamber 5 which are vertically partitioned by a partition slope 3 are provided on a machine parts chamber 2. These storage chambers 4 and 5 are covered with transparent glass plates on four sides, and the air in the lower storage chamber 5 is cooled by the operation of the refrigeration cycle mounted in the machine parts chamber 2 and the inside of the lower storage chamber 5 is cooled. The cool air is circulated in the upper storage chamber 4 by opening a damper (not shown) of the partition slope 3.

The upper storage chamber 4 is provided with a plurality of shelves 6 and 7, of which the shelves 7 are just above the partition slope 3 and are hidden and invisible in FIG. The lower storage room 5 is provided with a plurality of shelf boards 8 and 9.

As shown in FIG. 2, the refrigerating cycle mounted in the machine parts chamber 2 includes a compressor 11, a condenser 12, an expansion valve 13, which is a decompressor, and an evaporator 14, which are sequentially connected to each other, and 11 is a configuration in which the discharged refrigerant 11 is circulated in the direction of the solid arrow in the figure. A condenser fan 15 is provided near the condenser 12, and an evaporator fan 16 is provided near the evaporator 14. The condenser fan 15 sends outside air to the condenser 12, and the evaporator fan 16 circulates the air in the lower storage chamber 4 through the evaporator 14.

The shelves 6 and 7 in the upper storage compartment 4 are shown in FIG. The shelf 6 has a temperature sensor 21 as a first temperature detecting means.
Further, a bimetal type thermostat 22 which is a second temperature detecting means is attached, and a temperature sensor 31 which is a first temperature detecting means and a bimetal type thermostat 32 which is a second temperature detecting means are attached to the shelf plate 7. Temperature sensor 2
A temperature sensitive resistance element, for example, a negative characteristic thermistor is used as 1, 31. Reference numeral 50 is a thermo control unit, which will be described later, and is provided in the machine parts chamber 2.

Electric heaters for heating are attached to the shelves 6 and 7, respectively. This mounting state is shown in FIG. 4, and the electric heater 20 for heating is embedded in the peripheral edge of the shelf plate 6. The shelf board 7 has the same structure (electric heater 3
0).

Similar to the mounting of the electric heater 20 (and 30), the temperature sensors 21 and 31 and the thermostats 22 and 32 described above are also embedded in the shelves 6 and 7. Specific examples of this are shown in FIGS. 4, 5, and 6.

The shelf plate 6 is provided with a heat insulating material 6c between the upper plate 6a and the lower plate 6b, and the mounting member 23 is provided in the heat insulating material 6c.
The temperature sensor 21 and the thermostat 22 are attached via.

The mounting member 23 has a recess 23a for accommodating and holding the temperature sensor 21 and the thermostat 22 in a tandem manner, an L-shaped heater mounting portion 23b existing on one side of a lateral position along the longitudinal direction of the recess 23a, And recess 2
The fixing portion 23c exists on the other side of the lateral position along the longitudinal direction of 3a.

The temperature sensor 21 and the thermostat 22 are fitted into the recess 23a of the mounting member 23 in advance, and the electric heater 20 having a plurality of turns is further mounted on the heater mounting portion 2.
3b, and in that state, the screw 24 is passed through the fixing portion 23c, and the screw 24 is fixed to the upper plate 6a.
By mounting the mounting member 23 on the upper plate 6a.
Is fixed. With this fixing, the temperature sensor 21,
The thermostat 22 and the electric heater 20 are sandwiched between the mounting member 23 and the upper plate 6a. And
By providing the frame member 26 so as to cover the peripheral portion of the shelf board 6, the attachment of the temperature sensor 21 and the thermostat 22 to the shelf board 6 is completed.

The temperature sensor 31 and the thermostat 32 are attached to the shelf board 7 in the same manner. According to such a configuration, the temperature sensor 21 (31) and the thermostat 22 (32) can be collectively attached to the shelf plate 6 (7) by one attachment member 23, and the attachment is simplified.

On the other hand, the machine parts chamber 2 is provided with the control circuit shown in FIG. A series circuit of a lamp 42 and a lighting switch 43 is connected to a commercial AC power source 40 via a power switch 41. The lamp 42 collectively shows the lamps for illuminating the upper storage room 5 and the lower storage room 6, and is turned on by turning on the illumination switch 43. Power supply 40
A condenser fan motor 15M via a power switch 41 and a refrigeration thermo control switch 44;
Evaporator fan motor 16M and compressor motor 11
Connect M.

The thermo control switch 44 is a refrigerating control means for controlling the operation of the refrigeration cycle according to the temperature of the air in the lower storage chamber 5, and in order to keep the temperature in the lower storage chamber 5 at a set value, It senses the temperature inside the storage room and turns on when the sensed temperature is above the set value and turns off when it is below the set value.

A thermo-control unit 50 is connected to the power source 40 via a pair of contacts 45a, 45b of the temperature / refrigeration changeover switch 45. Hot / cold changeover switch 45
Is an operation means for switching whether the upper storage room 4 is used as a heating room or a refrigerating room, and is linked to the opening / closing operation of a damper (not shown) of the partition slope 3 to serve as a heating room. Both contacts 45a and 45b are turned on during use, and both contacts 45a and 45b are turned off during use as a refrigerator.

The thermo control unit 50 has bidirectional thyristors 61 and 62 and control units 71 and 72 mounted on a built-in circuit board, and has a temperature adjusting dial 51 which is a first operating means for temperature adjustment. .
The temperature control dial 51 is for switching the temperature of the stored goods in the upper storage room 4 to three stages of "high", "medium" and "low".

A series circuit of the electric heater 20, the thermal fuse 20a, and the thermostat 22 is connected to the power supply line in the thermo control unit 50 via the bidirectional thyristor 61. The thermal fuse 20a is
It is an accessory to the electric heater 20 and melts when the ambient temperature rises above a set value (above the OFF control point of the thermostat 22).

A series circuit of the electric heater 30, the temperature fuse 30a, and the thermostat 32 is connected to the power supply line in the thermo control unit 50 via the bidirectional thyristor 62. The thermal fuse 30a is
It is an accessory to the electric heater 30, and is blown when the ambient temperature rises abnormally and reaches a set value or higher (a temperature higher than the off control point of the thermostat 32).

The thermostats 22 and 23 function as the second temperature detecting means as described above, and at the same time,
The electric heater 2 is responsive to the temperature detected by the second temperature detecting means.
It also serves as second control means for controlling on / off of energization to 0 and 30.

The temperature sensor 21 and the shift range setting switch 73 which is the second operating means are connected to the control section 71, and the temperature sensor 22 and the shift range setting switch 74 which is the second operating means are connected to the control section 72.

The control section 71 has the following functional means. [1] When the detected temperature of the temperature sensor 21 reaches a predetermined OFF control point, the thyristor 61 is turned off, and when the detected temperature drops to the ON control point (a temperature lower than the OFF control point), the thyristor 61 is turned off. By electric heater 2
A first control means for controlling ON / OFF of energization to 0. In addition,
Regarding the relationship between the on / off control point of the first control means and the on / off control point of the thermostat 22 functioning as the second control means, the off control point of the thermostat 22 is set higher than that of the first control means. However, the ON control point of the thermostat 22 is set lower than that of the first control means. Further, the ON control point of the thermostat 22 is set to a room temperature (30 ° C.) or lower.

[2] The ON / OFF control points of the first control means are set to "high" and "medium" according to the operation of the temperature control dial 51.
Temperature adjusting means for shifting to three stages of "low" and shifting the shift range into a plurality of stages, for example, five stages according to the operation of the shift range setting switch 73.

The control section 72 has the following functional means. [1] The thyristor 62 is turned off when the detected temperature of the temperature sensor 31 reaches a predetermined off control point, and the thyristor 62 is turned off when the detected temperature falls to an on control point (a temperature lower than the off control point). By electric heater 3
A first control means for controlling ON / OFF of energization to 0. In addition,
Regarding the relationship between the on / off control point of the first control means and the on / off control point of the thermostat 32 functioning as the second control means, the off control point of the thermostat 32 is set higher than that of the first control means. However, the ON control point of the thermostat 32 is set lower than that of the first control means. Further, the ON control point of the thermostat 32 is set to a room temperature (30 ° C.) or lower.

[2] The ON / OFF control points of the first control means are set to "high" and "medium" according to the operation of the temperature control dial 51.
Temperature adjusting means for shifting to three stages of "low" and shifting the shift range into a plurality of stages, for example, five stages according to the operation of the shift range setting switch 73.

Such a thermo control unit 5
The appearance of No. 0 is shown in FIGS. 8 and 9. 52 is a built-in circuit board. 53 is a power cord connected to the temperature / refrigeration selector switch 45. 54 and 55 are lead wires connected to the electric heaters 20 and 30 and the thermostats 22 and 32. 56,57
Is a lead wire connected to the temperature sensors 21 and 31.

Next, the operation of the above configuration will be described. Now, it is assumed that the temperature in the lower storage chamber 5 is at or above the set value. When the power switch 41 is turned on in this state, the thermostat control switch 44 is turned on, so that the condenser fan 15, the evaporator fan 16,
And the compressor 11 is started. That is, the refrigeration cycle is turned on, and the air in the lower storage chamber 5 is cooled.

When cooling progresses and the temperature in the lower storage chamber 5 drops below the set value, the thermo control switch 4
4 is turned off and the operation of the refrigeration cycle is interrupted. When the temperature in the lower storage chamber 5 returns to the set value or higher due to this interruption,
The thermo control switch 44 is turned on again to restart the operation of the refrigeration cycle. In this way, the lower storage room 5 is cooled to a substantially constant temperature and functions as a refrigerating room.

If the damper (not shown) of the partition slope 3 is opened, the cold air in the lower storage chamber 5 also flows into the upper storage chamber 4, and the upper storage chamber 4 functions as a refrigerating chamber. in this case,
Since both contacts 45a and 45b of the temperature / refrigeration selector switch 45 are turned off in association with the opening operation of the damper, the thermo control unit 50 does not operate.

On the other hand, when the damper of the partition slope 3 is closed, the cold air in the lower storage chamber 5 does not enter the upper storage chamber 4. In conjunction with this, both contacts 45a of the temperature / refrigeration selector switch 45,
45b turns on, and the thermo control unit 50 operates.

The thermo control unit 50 detects the temperature of the shelves 6 and 7 by the temperature sensors 21 and 31, and turns on and off the thyristors 61 and 62 according to the detected temperature. By turning on and off, the electric heaters 20 and 30 repeatedly generate heat and stop, and the upper storage chamber 4 is warmed to a substantially constant temperature to become a storage chamber.

In this case, as shown in FIG. 10, the temperature of the storage chamber is "high" or "medium" depending on which of the "high", "medium" and "low" positions the temperature control dial 51 is set to.
It can be set to either "Low". Further, with respect to the "high", "medium", and "low" shift ranges, by operating the shift range setting switch 73, five levels of "1" to "5" can be set on the shelf board 6. it can. Further, the "high", "medium" and "low" shift ranges can be set to five levels of "1" to "5" in the shelf 7 portion by operating the shift range setting switch 74. . In other words, the shelf board 6 has 15 steps of temperature control, the shelf board 7 has 15 steps of temperature control, and a total of 75 steps.
It is possible to adjust the temperature in stages.

By the way, it is assumed that the temperature sensor 21 is broken, for example. In this case, since the resistance value of the temperature sensor 21 becomes infinite, the control unit 71 determines that the temperature of the shelf 6 is low and continues to turn on the thyristor 61. In this case, the electricity to the electric heater 20 continues to be supplied and the temperature of the shelf plate 6 continues to rise.

In case of such a failure of the temperature sensor 21, the operation of the thermostat 22 becomes effective. That is,
As shown in FIG. 11, when the temperature of the shelf 6 continues to rise and reaches the off control point of the thermostat 22, the thermostat 22 is turned off there. When the thermostat 22 is turned off, the electric power supply to the electric heater 20 is turned off, and further temperature rise is prevented. After that, the temperature of the shelf plate 6 continues to decrease, but the decrease stops at around room temperature (30 ° C.) and does not reach the ON control point of the thermostat 22.

Therefore, the operation stop of the electric heater 20 is maintained, and the abnormal temperature rise is prevented in advance. This not only improves the safety, but also prevents the deterioration of the stored products and the trouble that the can (made of metal) is hot and cannot be held. Even if the temperature sensor 31 of the shelf 7 fails, the thermostat 32 provides the same safety protection.

Moreover, since the temperature adjusting dial 51 and the shift range setting switches 73 and 74 are provided, it is possible to secure a plurality of temperature controllable heating chambers in the upper storage chamber 4. Therefore, different kinds of goods can be stored at the optimum temperature.

The upper storage chamber 4 is usually used for warming for about three months in a year, and for other relatively long periods, both contacts 4 of the changeover switch 45 are used.
5a and 45b are turned off and the thermo control unit 5
Thyristor 6 because it completely cuts off unnecessary energization to 0
The durability and reliability of circuit components including 1, 62 are improved.

The broken line shown in FIG. 11 is an example of conventional temperature control using an auxiliary thermostat. In the above embodiment, the case where the two shelves 6 and 7 are provided in the upper storage room 4 has been described, but the number of shelves is not limited, and may be appropriately set according to the capacity of the storage room 4 and the type of stored goods. Just set it. If three or four sheets are provided, it is necessary to increase the number of control units for temperature adjustment. Therefore, it is considered to use the case 80 shown in FIG. 12 as the case of the thermo control unit 50. To be

The casing 80 is a main body 8 having an opening at the top.
1, a lid 82 for closing the opening of the main body 81, the main body 8
It is composed of a pair of legs 83 provided on the bottom surface of No. 1 and has a structure in which the temperature adjusting control units 71 and 72 are housed in the main body 81 and the opening is closed by the lid 82. Further, the temperature adjusting dial 51 is attached to the lid 82. Further, the main body 81, the lid body 82, and the leg portion 83 are respectively provided with fixing screw insertion holes 81.
a, 82a, and 83a are provided, a plurality of main bodies 81 are stacked using the leg portions 83 as connecting members, and screwing is performed in the screw insertion holes, so that a few more control units are provided in addition to the control units 71 and 72. A part can be housed.

[0055]

As described above, in the hot and cold storage showcase of the first to fourth inventions, the shelf of the upper storage room has an electric heater for heating, a first temperature detecting means, and a second temperature. A detection unit is provided, and the energization to the electric heater is controlled to be turned on and off according to the detection temperature of the first temperature detection unit, and the energization to the electric heater is controlled to be turned on and off according to the detection temperature of the second temperature detection unit. Since the second control means is turned off at a higher temperature than that of the first control means and the second control means is turned on at a lower temperature than that of the first control means, the temperature detection means fails. However, it is possible to suppress an abnormal temperature rise, thereby improving safety and preventing the deterioration of stored products and the inconvenience that a can cannot be held because it is hot.

In the hot and cold storage showcase of the fifth invention, a plurality of shelves in the upper storage compartment are provided with electric heaters for heating, a first temperature detecting means and a second temperature detecting means, respectively. ON / OFF control of energization to each electric heater according to the detection temperature of the temperature detection means, ON / OFF control of energization to each electric heater according to the detection temperature of each second temperature detection means,
Among these, the energization of the second control means is performed at a higher temperature than that of the first control means, the energization of the second control means is performed at a lower temperature than that of the first control means, and one first operating means for temperature adjustment is used. And a plurality of second operating means are provided, and the first
The on / off control points of each first control means are shifted in a plurality of stages according to the operation of the operation means, and the shift range is independently set for each first control means according to the operation of each second operation means. Since it is configured to change, abnormal temperature rise can be suppressed even if the temperature detection means fails, which improves safety and prevents the deterioration of stored goods and the trouble that the cans are hot and cannot be held. Moreover, it is possible to secure a plurality of heating chambers with adjustable temperature.

In the hot and cold storage showcase of the sixth invention, an electric heater for heating, a thermal fuse, a first temperature detecting means, and a bimetal type thermostat are provided on a plurality of shelves in the upper storage compartment, and A thermo control unit is provided for turning on and off the electric power supply to each electric heater according to the temperature detected by the first temperature detecting means, and further has a pair of contacts, both of which are used as a heating room of the upper storage room. A switching switch to turn on is provided.The thermo control unit is connected to the power supply through both contacts of this switching switch, and each electric heater is connected in series with each bimetal type thermostat and each thermal fuse in the thermo control unit. Since it is connected to the line, it is possible to suppress abnormal temperature rise even if the temperature detection means fails. It can, thereby together thereby improving safety, can prevent a problem can not have hot and deterioration or cans storage products, more can be improved component durability and reliability related to temperature control.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a refrigeration cycle of the same embodiment.

FIG. 3 is a perspective view schematically showing the configurations of a shelf board, a temperature sensor, and a thermostat in the embodiment.

FIG. 4 is a perspective view schematically showing the configurations of a shelf board, an electric heater, a temperature sensor, and a thermostat in the embodiment.

FIG. 5 is a perspective view showing a configuration of a mounting member in the embodiment.

6 is a cross-sectional view showing the internal structure of the shelf board in FIG.

FIG. 7 is a block diagram of a control circuit of the embodiment.

FIG. 8 is an external perspective view of the thermo control unit of the same embodiment.

FIG. 9 is an internal configuration diagram of FIG. 8.

FIG. 10 is a diagram showing a temperature control range of the same embodiment.

FIG. 11 is a diagram showing a temperature change when the temperature sensor of the embodiment is out of order.

FIG. 12 is a perspective view showing a configuration of a modified example of the housing of the thermo control unit in the same embodiment.

[Explanation of symbols]

3 ... partition slope, 4 ... upper storage room, 5 ... lower storage room, 6,
7, 8, 9 ... Shelf plate, 11 ... Compressor, 12 ... Condenser, 14
... Evaporator, 20, 30 ... Electric heater, 21, 31 ... Temperature sensor (first temperature detecting means), 22, 32 ... Bimetal type thermostat (second temperature detecting means, second controlling means), 45 ... Hot / cold storage Changeover switch (operating means), 50
… Thermo control unit, 51… Temperature control dial, 71, 72… Control section.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location G05D 23/24 N 9132-3H H01H 37/04 A 9176-5G (72) Inventor Retsu Kioka Shizuoka Prefecture 336 Tatehara, Fuji City, Toshiba Fuji Factory (72) Inventor Shigeo Miyazaki 336, Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation, Fuji Factory (72) Teruji Mochizuki, 336, Tatehara, Fuji City, Shizuoka Toshiba Fuji Factory, Ltd. (72) Inventor Junichi Sano 336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation Fuji Factory

Claims (6)

[Claims] 1. A warming / cooling show in which a storage room whose side is covered with a transparent plate is divided into upper and lower parts, and the upper storage room is appropriately switched to a refrigerating room or a heating room and the lower storage room is used as a refrigerating room. In the case, a shelf board provided in the upper storage chamber, an electric heater for heating provided on the shelf board, a first temperature detecting means provided on the shelf board, and a temperature detected by the first temperature detecting means. According to the above, first control means for controlling on / off of energization to the electric heater, second temperature detection means provided on the shelf, and an off control point and an on control point lower than the first control means. And a second control means for controlling ON / OFF of energization of the electric heater according to the temperature detected by the second temperature detection means. 2. The shelf according to claim 1, wherein there are a plurality of shelves, and each of these shelves is provided with an electric heater, a first temperature detecting means, and a second temperature detecting means. Case. 3. The ON control point of the second control means is at room temperature (30
C.) or lower, and the hot / cold showcase according to claim 1. 4. The first temperature detecting means is a temperature-sensitive resistance element, and the first temperature control means is provided with a switching element in a current path to the electric heater, and the switching element is set to a temperature sensed by the temperature-sensitive resistance element. It opens and closes according to the second
The temperature / refrigerating showcase according to claim 1, wherein the temperature detecting means and the second temperature control means are bimetal type thermostats that detect a temperature to open and close the contacts. 5. A warming / cooling show in which a storage room whose side surface is covered with a transparent plate is partitioned into upper and lower parts, and the upper storage room is appropriately switched to a refrigerating room or a heating room and the lower storage room is used as a refrigerating room. In the case, a plurality of shelves provided in the upper storage chamber, and an electric heater for heating provided on these shelves,
First temperature detection means provided on each of the shelves, and a plurality of first control means for controlling on / off of energization of each electric heater according to the detected temperature of the first temperature detection means, and the first control means. One first operation means for temperature adjustment provided in common to the control means, and a first operation means for shifting the ON / OFF control points of each of the first control means in a plurality of stages in response to the operation of the first operation means. Temperature adjusting means, a plurality of second operating means for temperature adjustment provided corresponding to each of the first control means, and a shift range of ON / OFF control points by the first temperature adjusting means for each second operation. A second temperature adjusting means for independently shifting each of the first control means in accordance with the operation of the means, a second temperature detecting means provided on each of the shelves, and a higher OFF than the first control means. Detecting each of the second temperature detecting means having a control point and a low ON control point Temperature and refrigerated showcases, characterized in that a plurality of second control means for turning on, off control of energization of the electric heater in accordance with the time. 6. A warming / refrigerating show in which a storage room whose side surface is covered with a transparent plate is partitioned into upper and lower parts, and the upper storage room is appropriately switched to a refrigerating room or a heating room and the lower storage room is used as a refrigerating room. In the case, a lamp for illuminating the storage chamber, a refrigeration cycle for refrigeration connected to a compressor, a condenser, a decompressor, and an evaporator, a condenser fan for circulating outside air through the condenser, and the evaporation A fan for circulating the air in the storage chamber to a container, a thermo control switch that responds to at least the temperature of the lower storage chamber, and the compressor, the condenser fan, and the fan for the evaporator via the thermo control switch. A heating control circuit connected to a power source, a plurality of shelves provided in the upper storage chamber, an electric heater for heating provided on these shelves, and A temperature fuse attached to an electric heater, an energization control element for controlling energization to each of the electric heaters, a first temperature detecting means provided on each of the shelves, and a temperature detected by the first temperature detecting means. Accordingly, a thermo-control unit for turning on / off each energization control element, a bimetal type thermostat having an off-control point and a low on-control point higher than the thermo-control unit and provided on each shelf, and a pair of A changeover switch that has both contacts and is turned on when the upper storage room is used as a warm room, and the thermocontrol unit is connected to a power source through both contacts of the changeover switch,
A hot / cold showcase characterized in that the electric heaters are connected to the power supply line in the thermo control unit through the energization control elements, the bimetal type thermostats, and the temperature fuses in series.