JP2521943Y2 - Refrigeration / refrigerator temperature abnormality detection device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature abnormality detecting device for detecting an abnormal temperature in a refrigerator during cooling of a refrigerator or refrigerator.

[0002]

2. Description of the Related Art As a conventional apparatus for detecting a temperature abnormality of a refrigerator / refrigerator, as shown in FIG.
B, the internal temperature during cooling is detected, and when the detected temperature DT becomes higher than the allowable range TB, as shown by the solid curve in the figure, a time e after a predetermined time elapses from the time s In general, when the detected temperature DT is out of the allowable range TB, it is generally determined that an abnormality has occurred, an abnormal signal is output, and an alarm device is operated.

In the example shown in FIG. 2, in the case of the curve shown by the broken line in the figure, the detected temperature DT is again increased within the predetermined time from the time point s when the detected temperature DT becomes higher than the allowable range TB. , The abnormal signal is not output and no alarm is issued.

[0004]

However, in the above-mentioned conventional apparatus, since the magnitude of the abnormality, that is, the magnitude of the temperature difference is not taken into consideration at all, the state where the apparatus is not cooled down at all due to a failure of the refrigerator or the like is considered. Even if it is, the alarm signal is not output and the alarm device is not operated until a certain time (usually about one hour) has elapsed. For this reason, when the alarm is issued, the temperature of the stored product itself rises, which has a disadvantage that the quality of the stored product is greatly affected and deteriorated.

[0005] In order to solve such a situation, it is conceivable to shorten the time until the output of the abnormal signal. However, this has a disadvantage that erroneous operation frequently occurs due to a temperature rise due to opening and closing of a door.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator / refrigerator capable of accurately reporting an abnormal temperature in a refrigerator during cooling without adversely affecting a frozen / refrigerated product. An object of the present invention is to provide a temperature abnormality detection device.

[0007]

Means for Solving the Problems To achieve the above object, in claim 1, means for detecting the temperature inside the refrigerator during cooling and means for comparing the detected temperature with a preset allowable temperature range are provided. In a refrigerator / refrigerator temperature abnormality detection device that outputs an abnormality signal and notifies the occurrence of an abnormality when the detected temperature is outside the allowable range temperature, the time when the detected temperature is outside the allowable range temperature is measured. Means, means for calculating the difference between the detected temperature and the permissible range temperature, and a product of the time measurement time and the calculated temperature difference at the time, and an abnormal signal when the calculation result is equal to or greater than a preset value. Output means.

According to a second aspect of the present invention, the means for outputting the abnormal signal calculates a product of the unit time and the calculated temperature difference at the time of counting each time a predetermined unit time is measured, and further calculates the product at that time. An integrated value of the product is calculated, and an abnormal signal is output when the calculated result is equal to or greater than a preset value.

Further, in the present invention, a means is provided for outputting an abnormal signal when the detected temperature is outside the allowable range for a predetermined time even if the product is lower than a set value.

[0010]

According to the first aspect, the detected inside temperature is compared with a preset allowable range temperature. As a result of this comparison, when the detected temperature is out of the allowable range temperature, the time is continuously measured while the detected temperature is out of the allowable range temperature, and the temperature difference between the detected temperature and the allowable range temperature is calculated. Then, the product of the temperature difference and the measured time is calculated.

Here, if the calculated product is equal to or greater than a preset value, an abnormality signal is issued assuming that there is an abnormality in the internal temperature, and it is notified that an abnormality has occurred.

According to the present invention, the detected internal temperature is compared with a preset allowable temperature range. As a result of this comparison, when the detected temperature is out of the allowable range temperature, the timer is repeatedly performed for each predetermined unit time set in advance, and the product of the unit time and the calculated temperature difference at the time of the clock is calculated. The integrated value of the product at that time is calculated.

Here, when the calculated integrated value is equal to or larger than a preset value, an abnormality signal is issued assuming that there is an abnormality in the internal temperature, and it is notified that an abnormality has occurred.

According to the third aspect, even if the product is lower than the set value, if the detected temperature is outside the allowable range for a predetermined period of time, an abnormality signal is issued and an abnormality occurs. You will be notified that you have done so.

[0015]

FIG. 1 is a block diagram showing an embodiment of a temperature abnormality detecting device for a refrigerator / refrigerator according to the present invention. In FIG. 1, 1 is a temperature sensor, 2 is a temperature comparing unit, 3 is a cooling mode / defrosting mode switch (hereinafter, referred to as a mode switching unit), 4 is a gate unit, and 5,6. Is a timer, 7 is a calculation unit, 8
Is a first abnormal signal generator, 9 is a second abnormal signal generator,
Reference numeral 10 denotes an alarm device.

The temperature sensor 1 detects the temperature DT in the moving refrigerator.
Is detected. The temperature comparison unit 2 detects the detection temperature DT of the temperature sensor 1 and a preset allowable variation range TB of the internal temperature.
Is compared with the maximum value TBh, and when the detected temperature DT becomes higher than the allowable maximum value TBh, a difference signal DF having a level corresponding to the difference between them is output.

The gate section 4 receives the elapsed signal P from the timer 5.
The difference signal DF from the temperature comparison unit 2 is passed only during the input of S. The timer 5 counts a predetermined time t ₁ from the time when the operation mode becomes the cooling mode, and outputs the elapsed signal PS to the gate unit 4 after counting the time t ₁ . Note that the timer 5
It is reset when the power is turned off or when the operation mode is switched from the cooling mode to the defrosting mode, and the output of the elapsed signal PS is stopped.

The timer 6 has a difference signal D via the gate unit 4.
The timing operation is started in response to the input of F, and a timing signal TS indicating the timing is output to the arithmetic unit 7 and the second abnormal signal generating unit 9. The timer 6 is reset when the power is turned off, the input of the difference signal DF is stopped, or the reset signal RS is input by the arithmetic unit 7.

The arithmetic unit 7 receives the time signal TS of the timer 6 and outputs the unit time Δt
(For example, one minute), the timer 6
Counts the unit time Δt N (where N = 1, 2, 2,
.., N), that is, the time-up count N is stored, and the reset signal RS is output to the timer 6. Also,
In parallel with this, the temperature difference ΔT _N between the detected temperature DT and the maximum allowable value TBh is based on the difference signal DF via the gate unit 4.
(= DT−TBh), and further calculates the temperature difference ΔT _N
(ΔT _N × Δ)
t) is calculated, the integrated value X is calculated based on the following equation (1), and the result is output to the first abnormal signal generator 8 as a signal MP.

[0020]

(Equation 1)

The first abnormal signal generating section 8 compares the integrated value X indicated by the output signal MP of the calculating section 7 with a preset reference value TH, and when the integrated value X becomes equal to or greater than the reference value TH. Output the abnormal signal WG1 to the alarm device 10.

The second abnormal signal generator 9 obtains the number N of times that the timer 6 has counted the unit time Δt in the same manner as the arithmetic unit 7 based on the input of the time signal TS of the timer 6. It calculates a product t _X of the unit time Δt and the predetermined time t is set the integration time t _X is previously
_{If it is 2} (for example, 90 minutes) or more, an abnormal signal WG2 is output to the alarm device 10.

The alarm device 10 includes an abnormality display unit (not shown) or the like, and notifies that there is an abnormality in the refrigerator temperature by the abnormality display unit or the like when the abnormality signal WG1 or WG2 is input. Next, the operation of the above configuration will be described with reference to the flowchart of FIG.

When the mode switch 3 is in the cooling mode (S
1), the timer 5 from the switching time Star - collected by, counting of the predetermined time t ₁ is performed (S2). In step S2, if measurement of the predetermined time t ₁ has been completed, passed signal P
S is output to the gate unit 4.

On the other hand, the temperature inside the refrigerator during cooling is measured by the temperature sensor 1.
(S3), and the detected temperature DT is input to the temperature comparing unit 2. In the temperature comparison unit 2,
A comparison is made between the preset allowable maximum value TBh and the input detected temperature DT (S4). In step S4, if the detected temperature DT is higher than the maximum allowable value TBh, the difference signal DF having a level corresponding to the difference between the two is output from the temperature comparing section 2 to the gate section 4.

The input of the elapsed signal PS and the difference signal DF to the gate unit 4 outputs the difference signal DF to the timer 6, the arithmetic unit 7, and the second abnormal signal generator 9. Difference signal DF
Is input to the timer 6 (S5), and the clock signal TS is output to the calculation unit 7 and the second abnormal signal generation unit 9.

When the arithmetic unit 7 determines that the timer 6 has timed the unit time Δt based on the input of the time signal TS of the timer 6 (S6), it stores the number N of times-up (S7) and resets the reset signal. RS is output to the timer 6, and the timer 6 is reset (S8). Further, the arithmetic unit 7, the calculation of the temperature difference ΔT _N (= DT-TBh) between the detection temperature DT by entering the difference signal DF and allowable maximum value TBH is performed (S9), then the temperature difference [Delta] T _N And timer 6
Is calculated with the unit time Δt (ΔT _N × Δt) (S10). Further, the integrated value X is calculated based on the above equation (1) (S11), and the result is used as the signal MP as the first signal MP. Is output to the abnormal signal generator 8.

Further, in the second abnormal signal generating section 9, the number of times N that the timer 6 has counted the unit time Δt is obtained by the timer 6 in the same manner as the calculating section 7 by inputting the clock signal TS.
The product t _{X of the} number N of times up and the unit time Δt is calculated (S12).

In the first abnormal signal generator 8 to which the signal MP is input, the integrated value X indicated by the input signal MP is compared with a preset reference value TH (S13), and the value indicated by the output signal MP is changed. The abnormality signal WG <b> 1 is output to the alarm device 10 when the value becomes equal to or more than the reference value TH. In the alarm device 10, the abnormality display unit and the like are driven by the input of the abnormality signal WG1, and it is notified that there is an abnormality in the refrigerator temperature (S14).

On the other hand, in step S13, it determines that the integrated value X indicated by an output signal MP is lower than the reference value TH, and the integrated time t _X has reached the time t ₂ when the second abnormal signal generator 9 is calculated If it is determined that there is no (S1
5) Return to step S1.

If it is determined in step S15 that the accumulated time t _X has measured the time t ₂ , the abnormal signal WG2 is output from the second abnormal signal generator 9 to the alarm device 1
Output to 0. Accordingly, the process proceeds to step 14, and the fact that the internal temperature is abnormal is notified.

If the cooling mode is switched from the cooling mode to the defrosting mode in step S1, or if the detected temperature DT becomes equal to or lower than the allowable maximum value TBh in step S4, a timer for the difference signal DF is set. 6. Since the inputs to the arithmetic unit 7 and the second abnormal signal generating unit 9 are stopped, they are reset and return to the initial state (S16).

As described above, in this embodiment, the product (ΔT _N × Δt) of the temperature difference ΔT _N between the allowable maximum temperature TBh and the detected temperature DT in the refrigerator and the unit time Δt of the timer 6 is calculated. The integrated value X is calculated to issue an internal temperature abnormality alarm. This is because, in fact, the abnormality alarm needs to be issued in a short time as the degree of abnormality is large, specifically, as the temperature difference ΔT is large, but when the degree of abnormality is small, urgency is not so required. It depends.

As a result, as shown by the broken line in FIG. 4, even if the conventional apparatus cannot be notified as an abnormality although the degree of the abnormality is large, it can be accurately notified as an abnormality.

For example, if the reference value TH is 300 degrees / minute, the temperature difference ΔT at which the degree of abnormality is large is 15 degrees when the temperature difference ΔT is 20 degrees.
The abnormality can be notified in minutes (corresponding to point A in FIG. 4), and if the temperature difference ΔT at which the degree of abnormality is small is 5 degrees, the abnormality can be notified 60 minutes later (point B in FIG. 4). Equivalent).

The product of the temperature difference ΔT _N and the time Δt (Δ
Even when T _N × Delta] t integrated value X of) does not reach the reference value TH, if the integration time T _X becomes a predetermined time t ₂ or more, the abnormality alarm through the second abnormal signal generator 9 Because it is emitted, it is possible to know that an abnormality has occurred before the storage item is seriously damaged.

[0037]

As described above, according to the first aspect, it is possible to accurately notify the temperature abnormality in the refrigerator during cooling before adversely affecting the frozen / refrigerated product.

Further, according to the second aspect, there is an advantage that malfunctions due to opening and closing of the door can be suppressed, and the temperature inside the refrigerator can be monitored in a practical manner.

According to the third aspect, the occurrence of an abnormality can be notified before the frozen or refrigerated product is seriously damaged irrespective of the degree of the abnormality.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a temperature abnormality detection device for a refrigerator / refrigerator according to the present invention.

FIG. 2 is an explanatory diagram of a conventional example.

FIG. 3 is a flowchart for explaining the operation of the present invention.

FIG. 4 is a diagram for explaining the effect of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Temperature sensor 2 ... Temperature comparison part 3 ... Cooling mode / defrosting mode switching device 4 ... Gate part 5, 6 ... Timer 7 ... Calculation part 8 ... First abnormal signal generation part 9 ... No. 2 abnormal signal generator 10 ... alarm device

Claims (3)

(57) [Scope of request for utility model registration] 1. A device for detecting a temperature in a refrigerator during cooling, and a unit for comparing the detected temperature with a preset allowable temperature range, wherein an abnormal signal is output when the detected temperature is outside the allowable temperature range. And a means for measuring the time during which the detected temperature is outside the allowable temperature range, and a means for calculating a difference between the detected temperature and the allowable temperature range. And a means for calculating a product of the measured time and the calculated temperature difference at the time, and outputting an abnormal signal when the calculated result is equal to or greater than a preset value. Temperature abnormality detection device. 2. The means for outputting an abnormal signal calculates a product of the unit time and the calculated temperature difference at the time of measurement every time a predetermined unit time is measured, and further calculates an integrated value of the product at that time. 2. The freezing / refrigerator temperature abnormality detecting device according to claim 1, wherein the temperature is calculated and an abnormal signal is output when the calculated result is equal to or greater than a preset value. 3. Even if the product is lower than a set value,
3. The refrigerator / refrigerator temperature abnormality detecting device according to claim 1, further comprising means for outputting an abnormality signal when the detected temperature is outside the allowable range for a predetermined time.