JPS6038859Y2 - Rice low temperature storage - Google Patents

Description

[Detailed description of the invention] The present invention relates to a low-temperature storage warehouse for rice that can store rice while maintaining a certain low temperature and prevent dew from adhering to the rice when transporting the rice.

When storing rice grains such as rice and wheat, it is necessary to keep them at a certain low temperature to prevent quality deterioration.
When transporting rice grains, or when outside air enters the rice low temperature storage due to opening and closing of the door, a phenomenon of condensation in which dew adheres to the rice grains may occur.

This occurs when rice grains are cooled to a temperature below the dew point temperature of the outside air, and when such dew condensation occurs, the quality of rice grains deteriorates, so there is a need for improvement.

The present invention satisfies the above-mentioned demands, and its purpose is to prevent condensation from occurring when the rice stored in the rice low-temperature storage is carried out, and to reduce the temperature inside the rice low-temperature storage. By lowering as low as possible,
The purpose is to prevent quality deterioration of rice grains.

Examples will be described in detail below.

FIG. 1 is a perspective view of an embodiment of the present invention, in which 1 is a low-temperature storage for storing rice 3 that stores rice grains 3 at a certain low temperature, 2 is a door that can be opened and closed, 4 is a door that detects the absolute temperature of outside air, and 4 detects the dew point of outside air. A humidity detecting section that outputs a dew point temperature signal indicating temperature; 5 a temperature detecting section that detects the temperature inside the rice grain low temperature storage 1 and outputting a temperature signal; 6 a dew point temperature signal from the humidity detecting section 4 and a temperature detecting section This is a control unit that controls the operation of the cooler 7 based on the temperature signal from the cooler 7.

Further, FIG. 2 is a block diagram showing the configuration and connection relationship of the humidity detection section 4, temperature detection section 5, and control section 6, and the humidity detection section 4 is held so that it can freely contact the outside air. A heat sensitive element R3 such as a thermistor, a temperature compensating element R8 such as a thermistor kept in an absolutely dry state, and two resistors #29
A bridge circuit that operates from R3, resistor B1 to control the maximum value of current flowing through this bridge circuit, terminal A, 8
The bridge unbalanced voltage appearing between terminals A and 8 is composed of a resistor R2 connected between the amplifier AM
It is applied to the voltage comparator COM in the control section 6 via PI.

The temperature detection section 5 is composed of resistors R6 to R7 and thermistor n, and the bridge unbalanced voltage appearing between terminals C and D is applied to the voltage comparator COM in the control section 6 via the amplifier AMP2. .

Further, the control unit 6 controls the output voltage of the amplifier AMPL to
It is comprised of a voltage comparator COM that outputs a bi-level signal while the output voltage is lower than the output voltage of P2, and a control device 61 that controls the operation of the cooler 7 based on the output signal of the voltage comparator COM.

Note that E and R2 are power supplies.

Moreover, the heat sensitive element Rs. The temperature compensation element R6 is in a self-heating state (approximately 200°C) during operation, and the resistance R2,
The value of R3 is the value of terminal A, 8 in an atmosphere with zero humidity.
The selection is made so that the bridge unbalance voltage appearing between them is zero.

FIG. 3 is a diagram showing the measurement results of measuring the relationship between the bridge unbalanced voltage output from the humidity detection unit 4 and the absolute humidity (a thermistor is used as the heat sensitive element R8 and the temperature compensation element Rc). , as shown in the figure, the bridge unbalance voltage changes approximately in proportion to the absolute humidity of the outside air.

Furthermore, in this case, it has been confirmed through experiments that the humidity changes in proportion to only the absolute humidity, regardless of the temperature of the outside air.

That is, the output voltage of the bridge circuit indicates the absolute humidity of the outside air.

Also, since there is a one-to-one correspondence between the absolute humidity of the outside air and the dew point temperature, the relationship between the dew point temperature of the outside air and the bridge unbalanced output voltage is determined based on Figure 3, as shown in Figure 4. This is shown by solid line A.

That is, the bridge unbalanced voltage output from the bridge circuit increases as the dew point temperature of the outside air increases, and corresponds one-to-one with the dew point temperature of the outside air.

The bridge unbalanced voltage outputted from the humidity detection section 4, that is, the dew point temperature signal indicating the dew point temperature of the outside air, is transmitted to the amplifier AMP.
I to one terminal of the voltage comparator COM.

Further, the other terminal of the voltage comparator COM is connected to the amplifier AMP.
2, a temperature signal indicating the temperature inside the rice grain low temperature storage 1 is applied from the temperature detection section 5.

In this case, the output characteristics of the temperature signal output from the temperature detection section 5 are as shown by the solid line B in FIG.
The resistance values of the resistors R5 to R7 and the thermistor T are set so that the output characteristics of the dew point temperature signal output from the
It is desirable to select the characteristics of It is necessary to select the amplification factors for both so that

As mentioned above, the voltage comparator COM sets the output to bi-level while the output voltage from the amplifier AMPI is lower than the output voltage from the amplifier AMP2. A bi-level signal is applied to the controller 61 while the voltage is lower than .

That is, while the temperature inside the rice grain cold storage 1 is higher than the dew point temperature of the outside air, a bi-level signal is applied to the control device 61, and while the temperature inside the rice grain low temperature storage 1 is lower than the dew point temperature of the outside air, the low level signal is applied. A level signal is applied to controller 61.

Therefore, while a bi-level signal is applied to the control device 61, the cooler 7 is operated, and while a low-level signal is applied to the control device 61, the operation of the cooler 7 is stopped. This prevents dew from adhering to the rice 3 when the rice 3 is taken out from the rice low temperature storage 1 or when outside air enters the rice low temperature storage 1 by opening the door 2. Moreover, since the temperature inside the rice grain low temperature storage 1 can be made as low as possible, the quality of the rice grain 3 can be maintained.

As explained above, the present invention detects the temperature inside the rice low-temperature storage and outputs a temperature signal in a rice low-temperature storage that stores rice at a low temperature, such as rice low-temperature storage 1. A detection unit, a humidity detection unit that detects the absolute humidity of outside air and outputs a dew point temperature signal, and a humidity detection unit that detects the absolute humidity of outside air and outputs a dew point temperature signal, and determines whether the temperature inside the rice low temperature storage is above or below the dew point temperature of outside air based on the temperature signal and the dew point temperature signal. Judgment means such as a voltage comparator COM to judge, when the judgment means judges that the temperature inside the rice low temperature storage is below the dew point temperature of the outside air, the operation of the cooler is stopped and the temperature inside the rice grain storage is stopped and the temperature is above the dew point temperature of the outside air. When it is determined that this is the case, the temperature inside the rice cold storage is always maintained at the lowest temperature within the range higher than the dew point temperature of the outside air because it is equipped with a control device that operates the cooler.

Therefore, according to the low-temperature storage for rice grains of the present invention, rice grains can be stored at a certain low temperature, and dew can be prevented from adhering to the rice grains when the rice grains are transported or when outside air enters the rice grains. It has the advantage of preventing quality deterioration of rice grains.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a block diagram showing the structure and connection relationship of the humidity detection section 4, temperature detection section 5, and control section 6, and Fig. 3 is absolute humidity and output voltage. Figure 4 shows the relationship between dew point temperature and dew point temperature signal.
FIG. 3 is a diagram showing the relationship between temperature and temperature signal. 1 is a rice grain low temperature storage, 2 is a door, 3 is rice, 4 is a humidity detection unit, 5 is a temperature detection unit, 6 is a control unit, 7 is a cooler, 61
is a control device, R1-R7 are resistors, R3 is a thermal element, Ro
is a temperature compensation element, AMP 1 . AMP2 is an amplifier, Th is a thermistor, COM is a voltage comparator, E, R2 is a power supply.

Claims (1)

[Scope of utility model registration request] In a rice low-temperature storage for storing rice at low temperature, a temperature detection section is installed inside the rice low-temperature storage to detect the temperature inside the rice low-temperature storage and outputs a temperature signal, and is installed outside the rice low-temperature storage. , a humidity detection unit that detects the absolute humidity of outside air and outputs a dew point temperature signal; based on the temperature signal and the dew point temperature signal, whether the temperature in the rice low temperature storage is above or below the dew point temperature of the outside air; a determining means for determining, a cooler installed in the rice low-temperature storage and cooling the rice low-temperature storage, and when the determining means determines that the temperature inside the low-temperature storage is equal to or higher than the dew point temperature of the outside air; A rice grain low-temperature storage warehouse characterized by comprising a control device for operating the cooler.