JPH0230706Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a temperature control device for a constant temperature storage for preserving articles such as food and fishing bait at a required temperature.

b. Conventional technology Conventionally, for example, when ripening noodles such as udon noodles, it has been said that the flavor is greatly improved by storing them at a certain temperature range for a certain period of time. ), and the control circuit shown in FIG. 5 has generally been adopted to control the temperature in the storage cabinet where such items are stored at a constant level.

That is, in FIG. 5, the inside temperature regulator 9 provided in the control circuit section 11 of the heating heater 5 and the cooling refrigerator 8 has a high temperature side contact 9b and a low temperature side contact 9.
A refrigerator 8 is connected in series to the high temperature side contact 9b, a heater 5 is connected in series to the low temperature side contact 9c, and a fan motor 6 is directly connected to the power supply line 11a. For example, if the high temperature side contact 9b is set to 17°C and the low temperature side contact 9c is set to 13°C, when the refrigerator 8 is activated and the temperature inside the refrigerator falls to 13°C, the low temperature side contact 9c is set to 17°C. The heater 5 is turned on and the temperature inside the refrigerator rises again.
When the temperature reached 17°C, the high temperature side contact 9b was turned on and the refrigerator 8 was activated to lower the temperature inside the refrigerator, and the temperature inside the refrigerator was maintained at about 15°C on average.

c Problems that the invention aims to solve In the conventional configuration as described above, a single temperature controller controls the high and low temperatures inside the storage, and temperature rises and falls are controlled by cooling and heating using a refrigerator and a heater. Because it relied only on repeated alternating operations, one or the other was always in operation, resulting in extremely large power consumption and being uneconomical.

d.Means for solving the problem In order to quickly solve the above-mentioned drawbacks, the present invention has a fan motor, an evaporator, and a heater for an air circulation fan inside the refrigerator, and a compressor outside the refrigerator. In the warehouse temperature control device, the control circuit section has a high temperature side contact and a low temperature side contact. The refrigerator includes an inside temperature controller that detects the temperature inside the storage, and an outside temperature controller that has a high temperature side contact and a low temperature side contact and detects the temperature outside the storage. The compressor is connected between the high-temperature side contacts of the outside temperature regulator, the heater is connected between the low-temperature contacts, and the fan motor is connected between the high-temperature side contacts of the inside temperature regulator and the heater. The present invention is characterized in that a refrigerator internal temperature rise prevention device is connected that cuts off conduction to the fan motor when the low temperature side contact of the refrigerator outside temperature regulator is on.

e Effect: Only when the temperature inside the refrigerator becomes high and the high-temperature side contacts of the temperature controller inside the refrigerator and the temperature controller outside the refrigerator turn on, the refrigerator operates and lowers the temperature inside the refrigerator. The heater operates and raises the temperature inside the refrigerator only when the low-temperature side contacts of the inside temperature controller and the outside temperature controller are turned on. By utilizing this effect, a delay time is given to the operation of the refrigerator and heater, thereby achieving energy saving.

Moreover, the temperature rise prevention device connected to the fan motor is designed to prevent the temperature inside the refrigerator from rising above a set value due to the heat generated by the fan motor. This function prevents the fan motor from operating when

f. Embodiment Hereinafter, a preferred embodiment of the internal temperature control device for a constant temperature storage according to the present invention will be described in detail with reference to the drawings.

Note that parts that are the same as or correspond to those in the conventional example will be described using the same reference numerals.

In FIG. 4, what is designated by the reference numeral 1 is a storage warehouse that is almost box-shaped as a whole, and is insulated with a heat insulating material 1a, and an opening/closing door 3 having a gasket 2 is provided on the front side. There is.

An evaporator 4 is fixed at an upper position inside the storage 1, and a duct 7 having a heater 5 and a fan motor 6 is arranged below the evaporator 4. The duct 7 has a substantially L-shaped cross section as a whole, extends substantially horizontally along the wall surface of the storage 1, and then hangs downward. By driving the fan motor 6, air sucked in from the lower end 7a of the duct 7 circulates within the storage 1 through the path indicated by the arrow.

A refrigerator 8 comprising a compressor 8a, a condenser 8b, a cooling fan 8c, etc. is disposed on the upper surface 1b of the storage 1.

Further, on the upper surface 1b, a lower end 7a of the duct 7 is provided.
an inside temperature regulator 9 connected to an inside temperature sensing section 9a disposed on the refrigerator, and an outside temperature regulator 1 connected to an outside temperature sensing section 10a disposed on the upper surface 1b.
0 are arranged, and each temperature regulator 9 and 10 is
Although not shown, as is well known, the temperature can be set freely.

The heater 5, fan motor 6, refrigerator 8, refrigerator inner temperature regulator 9, refrigerator outer temperature regulator 10, etc. arranged as described above can be electrically connected as shown in FIG. . That is, power line 1
A safety breaker 11b is connected to each of the refrigerators 1a, and the refrigerator 8 is connected in series to the power supply line 11a between the high temperature side contact 9b of the inside temperature regulator 9 and the high temperature side contact 10b of the outside temperature regulator 10. Along with
The heater 5 is the low temperature side contact 9c of the inside temperature regulator 9.
and the low temperature side contact 10c of the outside temperature controller 10 are connected in series to the power supply line 11a,
The fan motor 6 is directly connected to the power supply line 11a.

When connected as shown in Figure 1, the temperature controller 9 inside the refrigerator is 13℃ to 17℃, and the temperature controller outside the refrigerator 10 is 14℃.
~16 DEG C., high temperature is detected by each high temperature side contact 9b, 10b, and low temperature is detected by each low temperature side contact 9c, 10c. That is, when the outside temperature is high, the outside temperature controller 10 closes the high temperature side contact 10b.
is on. When the internal temperature rises and the high temperature side contact 9b of the internal temperature regulator 9 turns on,
The refrigerator 8, that is, the compressor 8a operates to lower the temperature inside the refrigerator by the evaporator 4, and when the temperature inside the refrigerator reaches 13° C., the low temperature side contact 9c of the inside temperature regulator 9 is activated.
is turned on, but since the high temperature side contact 10b of the outside temperature controller 10 is on, the heater 5 does not operate, and the temperature rise inside the refrigerator after the refrigerator 8 is stopped is only due to the influence of the outside temperature. That is, since the external temperature is used and it takes a considerable amount of time for the temperature to rise, only the refrigerator 8 is operated intermittently, and energy saving is achieved by the amount that the heater 5 is not energized.

Further, when the outside air temperature is low, contrary to the above-described operation, the low temperature side contact 10c of the outside temperature regulator 10 is turned on, the internal temperature decreases, and the low temperature side contact 9c of the inside temperature regulator 9 is turned on. When turned on, the heater 5 operates to raise the temperature inside the refrigerator, and when the temperature inside the refrigerator reaches 17°C, the high temperature side contact 9b of the inside temperature regulator 9 turns on, but the temperature outside the refrigerator is not adjusted. Since the low temperature side contact 10c of the container 10 is on, the refrigerator 8 does not operate, and the temperature drop inside the refrigerator after the heater 5 stops operating is only due to the influence of the outside temperature.
Since the external temperature is used, and it takes a considerable amount of time to lower the temperature, only the heater 5 is operated intermittently, and energy saving is achieved by the fact that the refrigerator 8 is not energized.

If only the connection is made as shown in Fig. 1, the fan motor 6 will be constantly driven because it is directly connected to the power supply line 11a, and if the outside temperature is low and the inside temperature is high, Furthermore, the heat generated from the fan motor 6 may cause the temperature inside the refrigerator to exceed a set value.

Therefore, in the embodiment of the present invention shown in FIG. 2, in order to control the heat generated from the constantly operating fan motor 6 in the control circuit section 11 shown in FIG. 1, in order to perform more accurate temperature control. , a device for preventing temperature rise inside the refrigerator described below has been added.

That is, since the basic configuration is the same as that in FIG. 1, the same or corresponding parts will be given the same reference numerals and the explanation thereof will be omitted.

A first relay 12 is connected in parallel to the refrigerator 8, and a second relay 13 is connected to the heater 5.
are connected in parallel, and the first relay contact 12a and the second relay contact 13 of each relay 12, 13
a are connected in parallel with each other and in series between the fan motor 6 and the power supply line 11a.

The above-mentioned temperature rise prevention device includes the first relay 12,
Its contact 12a, second relay 13 and its contact 1
3a.

In the above control circuit section 11 shown in FIG. 2, only when the refrigerator 8 or the heater 5 is activated, only one of the relays 12 and 13 is turned on and the fan motor 6 is activated. For example, when the high temperature side contact 9b of the inside temperature regulator 9 is on and the low temperature side contact 10c of the outside temperature regulator 10 is on, that is, when the outside temperature is low and the inside temperature is high, the fan Since the motor 6 does not operate, the temperature inside the refrigerator does not rise above the set value due to waste heat from the fan motor 6, and the temperature remains at the required 15℃.
It is possible to ensure the temperature inside the refrigerator before and after.

The embodiment shown in FIG. 3 has a different structure from the embodiment shown in FIG. are different. Third
If configured as in the embodiment shown in the figure, the fan motor 6 will be controlled by the inside temperature controller 9 when the outside air temperature is low and the heater 5 is activated, and when the outside air temperature is low and Not only does the fan motor 6 not operate when the temperature inside the refrigerator is high, but also when the outside temperature is high, the fan motor 6 is continuously operated regardless of the temperature controller 9 inside the refrigerator because the terminal 12b is connected to the power supply line 11a. . Therefore, it is possible to flatten the temperature distribution inside the refrigerator as much as possible when the compressor is stopped when the outside air is high temperature.

g. Effects of the invention The internal temperature control device for a constant temperature storage according to the invention has the above-mentioned configuration and function, so when the outside temperature is low, the inside of the refrigerator can be almost completely controlled by intermittently operating only the heater. The temperature is constant, and when the outside temperature is high, the temperature is almost constant by only intermittent operation of the refrigerator, so the temperature can be increased or decreased as much as possible due to the influence of the outside temperature, achieving extremely energy-saving constant temperature storage. In addition, since the fan motor is not operated when the outside temperature is low and the internal temperature is high, it is possible to prevent the internal temperature from rising above the set value due to the heat of the fan motor.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the control circuit section of the internal control device of a constant temperature storage warehouse in which the present invention can be implemented, Fig. 2 is a circuit diagram showing the first embodiment of the present invention, and Fig. 3 is a circuit diagram showing the control circuit section of the internal control device of a constant temperature storage warehouse in which the present invention can be implemented. FIG. 4 is a sectional view showing a constant temperature storage according to the present invention, and FIG. 5 is a circuit diagram showing a conventional control circuit. 1... Storage, 2... Gasket, 3... Door, 4... Evaporator, 5... Heater, 6... Fan motor, 7... Duct, 8... Freezer, 8a...
Compressor, 8b... Condenser, 8c... Cooling fan,
9... Inside temperature regulator, 9a... Inside temperature sensing section,
9b...High temperature side contact, 9c...Low temperature side contact, 10
...Outside temperature regulator, 10a...Outside air temperature sensing section,
10b...High temperature side contact, 10c...Low temperature side contact,
11...Control circuit section, 11a...Power line, 1
2...first relay, 12a...first relay contact,
13...Second relay, 13a...Second relay contact.

Claims (1)

[Scope of utility model registration request] The heater 5 is controlled by the control circuit 11 to maintain a constant temperature inside the storage 1, which has a fan motor 6 for an air circulation fan, an evaporator 4, and a heater 5 inside the storage, and a compressor 8a outside the storage. In the refrigerator internal temperature control device that controls the operation of the compressor 8a, the control circuit section 11 is a refrigerator internal temperature controller that has a high temperature side contact 9b and a low temperature side contact 9c and detects the temperature inside the storage 1. 9, and an outside temperature regulator 10 having a high temperature side contact 10b and a low temperature side contact 10c and detecting the temperature outside the storage 1. The compressor 8a is connected between the high temperature side contacts 9b and 10b, and the heater 5 is connected between the low temperature side contacts 9c and 10c. It is characterized in that an internal temperature rise prevention device 12, 12a, 13, 13a is connected to the side contact 9b and the low-temperature side contact 10c of the outside temperature regulator 10, which disconnects electrical conduction to the fan motor 6 when it is on. Temperature control device for constant temperature storage.