JPH04120585U - Temperature abnormality detection device for freezers and refrigerators - Google Patents

Abstract

(57) [Summary] [Purpose] To notify of abnormal temperature inside the refrigerator during cooling before it adversely affects frozen/refrigerated products. [Configuration] The temperature comparison unit 2 compares the internal temperature detected by the temperature sensor 1 and a preset allowable range temperature TBh, and if the detected temperature DT is outside the allowable range temperature TBh, at that point The unit time Δt is continuously set by the timer 6 while the detected temperature DT is outside the allowable range temperature TBh.
At the same time, the calculation unit 7 calculates the unit time Δ
Find the temperature difference ΔT _N between the detected temperature DT and the allowable range temperature TBh every t measurements, calculate the product of this temperature difference ΔT _N and the unit time Δt, calculate the integrated value X of this product, and calculate the integrated value If X is greater than or equal to a preset value TH, it is assumed that there is an abnormality in the temperature inside the refrigerator, and the first abnormality signal generating section 8 generates an abnormality signal WG1 to notify via the alarm device 10 that an abnormality has occurred.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a temperature abnormality detection system that detects abnormalities in the internal temperature of freezers and refrigerators during cooling. This invention relates to a detection device.

0002

[Conventional technology]

As a conventional temperature abnormality detection device for freezers and refrigerators, as shown in Figure 2, The suitable temperature range for storage of stored goods set in advance is defined as the permissible temperature fluctuation range TB for the internal temperature. , detects the internal temperature during cooling and detects that the detected temperature DT is higher than the allowable range TB. In this case, as shown by the solid curve in the figure, a preset point is reached from that point s. If the detected temperature DT is outside the allowable range TB even after a certain period of time e has elapsed, an abnormality will occur. It is common for devices to determine that a problem has occurred, output an abnormal signal, and activate an alarm device. be.

0003 In addition, in the example of Fig. 2, in the case of the curve shown by the broken line in the figure, the detected temperature DT is permissible. The detected temperature will be detected again within a preset period of time from the time s when it becomes higher than the range TB. Since the degree DT has returned to within the allowable range TB, no abnormal signal is output and no alarm is issued. I can't do it.

0004

[Problem that the idea aims to solve]

However, with the above-mentioned conventional device, it is difficult to determine the degree of abnormality, that is, the temperature difference. Since the size is not considered at all, even if the refrigerator does not cool at all due to a malfunction such as a refrigerator, etc. Even if the condition is abnormal, the abnormal signal will not be output until a certain period of time (usually about an hour) No output and alarm device will not operate. Therefore, when an alarm is issued, stored items are The disadvantage is that the temperature of the product itself increases, which greatly affects its quality and causes it to deteriorate. was there.

[0005] To solve this situation, it is possible to shorten the time it takes for the abnormal signal to be output. This is possible, but this has the disadvantage that malfunctions occur frequently due to temperature rises caused by opening and closing doors, etc. There is a point.

[0006] This invention was made in view of the above circumstances, and its purpose is to Refrigeration system that can accurately notify temperature abnormalities inside the refrigerator during cooling without adversely affecting the product. An object of the present invention is to provide a temperature abnormality detection device for a refrigerator.

[0007]

[Means to solve the problem]

In order to achieve the above object, claim 1 includes means for detecting the temperature inside the refrigerator during cooling. , and a means for comparing this detected temperature with a preset allowable range temperature. , outputs an abnormal signal when the detected temperature is outside the permissible temperature range to notify that an abnormality has occurred. The detected temperature is outside the permissible temperature range of the temperature abnormality detection device for freezers and refrigerators. and a means for calculating the difference between the detected temperature and the allowable range temperature. , calculate the product of the measured time and the calculated temperature difference at that time, and calculate the result of this calculation. means for outputting an abnormal signal when the value exceeds a preset value.

[0008] Further, in claim 2, the means for outputting the abnormality signal is arranged at a preset location. For each fixed unit time measurement, calculate the product of the unit time and the calculated temperature difference at the time of measurement. , further calculates the integrated value of the product at that point, and this calculation result is calculated in advance. An abnormal signal is now output when the value exceeds the set value.

[0009] Further, in claim 3, even if the product is lower than a set value, the detected temperature is set to a predetermined value. A means is provided to output an abnormal signal if the value is continuously outside the allowable range.

0010

[Effect]

According to claim 1, the detected internal temperature is within a preset allowable range temperature. compared to As a result of this comparison, if the detected temperature is outside the allowable range, From this point on, the detected temperature will continue to be counted while it is outside the allowable temperature range. The temperature difference between the temperature and the allowable range temperature is determined, and the product of this temperature difference and the clock time is calculated. It will be done.

[0011] If the calculated product is greater than the preset value, there is an abnormality in the internal temperature. If so, an abnormality signal is generated to notify that an abnormality has occurred.

0012 Further, according to claim 2, the detected internal temperature is within a preset tolerance range. compared to ambient temperature. As a result of this comparison, if the detected temperature is outside the allowable range , time is repeatedly measured every preset predetermined unit time, and The product of the calculated temperature difference at the time of measurement is calculated, and then The integrated value of the product is calculated.

[0013] Here, if the calculated integrated value is greater than or equal to the preset value, the temperature inside the refrigerator will change. An abnormality signal is issued to notify that an abnormality has occurred.

[0014] Further, according to claim 3, even if the product is lower than the set value, the detected temperature is If the value continues to be outside the allowable range for a specified period of time, an abnormality signal will be issued and an abnormality will occur. You will be notified that the

[0015]

【Example】

FIG. 1 is a block diagram showing an embodiment of the temperature abnormality detection device for freezers and refrigerators according to the present invention. FIG. In Figure 1, 1 is a temperature sensor, 2 is a temperature comparison unit, and 3 is a cooling unit. mode/defrosting mode switching device (hereinafter referred to as mode switching section), 4 is a gate section, 5, 6 is a timer, 7 is a calculation section, 8 is a first abnormal signal generation section, and 9 is a second abnormal signal generation section. Section 10 is an alarm device.

[0016] The temperature sensor 1 detects the temperature DT inside the moving refrigerator. The temperature comparison section 2 The maximum of the detected temperature DT of sensor 1 and the preset allowable fluctuation range TB of the internal temperature. When the detected temperature DT becomes higher than the maximum allowable value TBh, A difference signal DF having a level corresponding to the difference between the two is output.

The gate section 4 allows the difference signal DF from the temperature comparison section 2 to pass only while the timer 5 is inputting the elapsed signal PS. The timer 5 measures a predetermined time t ₁ from the time when the operation mode becomes the cooling mode, and outputs a progress signal PS to the gate section 4 after counting the time t ₁ . Note that the timer 5 is reset and stops outputting the elapsed signal PS when the power is turned off or the operation mode is switched from the cooling mode to the defrosting mode.

[0018] The timer 6 starts timing operation upon input of the difference signal DF via the gate section 4, A clock signal TS indicating the clock time is output to the calculation section 7 and the second abnormal signal generation section 9. Ru. Note that the timer 6 is activated when the power is cut off, the input of the difference signal DF is stopped, or the calculation unit 7 resets the timer 6. It is reset by inputting the set signal RS.

If the calculation unit 7 determines that the timer 6 has clocked a preset unit time Δt (for example, 1 minute) based on the input of the clock signal TS of the timer 6, the calculation unit 7 calculates the number of times the timer 6 has clocked the unit time Δt. N (where N=1, 2, . . . , n), that is, the number of time-up times N is stored, and a reset signal RS is output to the timer 6. In parallel, the temperature difference ΔT _N (=DT - TBh) between the detected temperature DT and the allowable maximum value TBh is determined based on the difference signal DF via the gate section 4, and this temperature difference Calculate the product (ΔT _N ×Δt) of ΔT _N and the unit time Δt measured by timer 6, calculate the integrated value X based on the following formula (1), and use the result as the signal MP to detect the first abnormality. It is output to the signal generator 8.

[0020]

[Math 1]

[0021] The first abnormal signal generating section 8 determines whether the integrated value X indicated by the output signal MP of the calculating section 7 is approximately equal to A comparison is made with the previously set reference value TH, and if the integrated value X exceeds the reference value TH, An abnormality signal WG1 is output to the alarm device 10 at the same time.

[0022] The second abnormal signal generation unit 9 receives the timer signal TS from the timer 6 and calculates the number of time-ups N during which the timer 6 has timed the unit time Δt in the same manner as the calculation unit 7, and calculates the number of time-up times N The product t _X of and unit time _Δt is calculated, and if this integrated time _t

[0023] The alarm device 10 is composed of an abnormality display unit (not shown), etc., and outputs an abnormality signal WG1 or In response to the input from WG2, the abnormality display unit or the like notifies that there is an abnormality in the temperature inside the refrigerator. Next, the operation of the above configuration will be explained based on the flowchart of FIG.

[0024] When the mode switch 3 is in the cooling mode (S1), the timer 5 starts from the switching point and measures a predetermined time _t1 (S2). In step S2, when the measurement of the predetermined time _t1 is completed, a progress signal PS is output to the gate section 4.

[0025] On the other hand, the temperature inside the refrigerator during cooling is continuously detected by temperature sensor 1 (S 3) This detected temperature DT is input to the temperature comparison section 2. In temperature comparison section 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 allowable maximum value TBh, In this case, a difference signal DF having a level corresponding to the difference between the two from the temperature comparator 2 is sent to the gate. It is output to section 4.

[0026] By inputting the elapsed signal PS and the difference signal DF to the gate section 4, the difference signal DF is triggered. The signal is output to the timer 6, the calculation section 7, and the second abnormal signal generation section 9. The difference signal DF Timing is started by the input to the timer 6 (S5), and the timing signal TS is sent to the calculation unit 7 and It is output to the second abnormal signal generating section 9.

In the arithmetic unit 7, when it is determined 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 of time-up times N (S7) and sends a reset signal. The RS is output to the timer 6, and the timer 6 is reset (S8). Further, the calculation unit 7 inputs the difference signal DF to calculate the temperature difference ΔT _N (=DT−TBh) between the detected temperature DT and the allowable maximum value TBh (S9), and then this temperature difference ΔT _N The product (ΔT _N ×Δt) of the timer 6 and the unit time Δt is calculated (S10), and the integrated value X is calculated based on the above equation (1) (S11), and the result is the signal MP The signal is output to the first abnormal signal generating section 8 as a signal.

Further, in the second abnormal signal generating section 9, the number of time-up times N in which the timer 6 has timed the unit time Δt is determined in the same way as the calculation section 7 by inputting the clock signal TS, and this number of time-up times N The product _tX of the unit time Δt and the unit time Δt is calculated (S12).

[0029] In the first abnormal signal generation unit 8 to which the signal MP is input, the integrated value indicated by the input signal MP is A comparison is made between X and a preset reference value TH (S13), and the output signal MP When the value indicated by becomes equal to or higher than the reference value TH, an abnormal signal WG1 is output to the alarm device 10. be done. In the alarm device 10, the abnormality display section etc. are driven by the input of the abnormality signal WG1. Then, it is notified that there is an abnormality in the temperature inside the refrigerator (S14).

On the other hand, in step S13, it is determined that the integrated value X indicated by the output signal MP is lower than the reference value TH, and the integrated time _tX calculated by the second abnormal signal generating section 9 reaches time _t2 . If it is determined that it is not (S15), the process returns to step S1.

[0031]Furthermore, in step S15, if it is determined that the cumulative time _tX is equal to the time _t2 , the abnormality signal WG2 is outputted from the second abnormality signal generating section 9 to the alarm device 10. As a result, the process moves to step 14, where it is reported that there is an abnormality in the temperature inside the refrigerator.

[0032] In addition, in step S1, when switching from cooling mode to defrosting mode Or, in step S4, the detected temperature DT has become lower than the maximum allowable value TBh. In this case, the difference signal DF is sent to the timer 6, the calculation unit 7 and the second abnormal signal generation unit 9. Since the input stops, these 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 maximum allowable temperature TBh and the detected internal temperature DT and the unit time Δt of the timer 6 is calculated, and The integrated value X is calculated and an abnormal temperature alarm inside the refrigerator is issued. This means that in reality, the greater the degree of abnormality, specifically the greater the temperature difference ΔT, the shorter the time it is necessary to issue an abnormality alarm, but when the degree of abnormality is small, it is not necessary to issue such an emergency alarm. It depends.

[0034] As a result, as shown by the broken line in Figure 4, even if the degree of abnormality is large with the conventional device, Even if it cannot be reported as an abnormality regardless of the situation, it can be accurately reported as an abnormality. become.

[0035] For example, if the reference value TH is 300 degrees/min, the temperature difference Δ with a large degree of abnormality is When T is 20 degrees, an abnormality can be reported in 15 minutes (corresponding to point A in Figure 4). If the normal small temperature difference ΔT is 5 degrees, an abnormality can be notified after 60 minutes. (corresponding to point B in Figure 4).

Furthermore, even if the integrated value X of the product of the temperature difference ΔT _N and the time Δt (ΔT _N ×Δt) does not reach the reference value TH, if _the integrated time _T Since an abnormality alarm is issued via the second abnormality signal generating section 9, the occurrence of an abnormality can be known before major damage is caused to the stored items.

[0037]

[Effect of the idea]

As explained above, according to claim 1, before the frozen/refrigerated products are adversely affected, Abnormal temperatures inside the refrigerator during cooling can be accurately reported.

[0038] Further, according to claim 2, it is possible to suppress malfunctions caused by opening and closing of doors, etc., and to make the storage suitable for practical use. It has the advantage of being able to monitor the internal temperature.

[0039] Furthermore, according to claim 3, it is possible to significantly affect frozen and refrigerated products regardless of the degree of abnormality. It is possible to notify of an abnormality before it causes serious damage.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a temperature abnormality detection device for a freezer/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 effects of the present invention.

[Explanation of symbols]

1...Temperature sensor 2...Temperature comparison section 3...Cooling mode/defrosting mode switch 4...Gate part 5, 6...timer 7... Arithmetic section 8...First abnormal signal generating section 9...Second abnormal signal generating section 10...Alarm device

Claims (3)

[Scope of utility model registration request] 1. A means for detecting the temperature inside the refrigerator during cooling, and a means for comparing the detected temperature with a preset allowable range temperature, and generates an abnormality signal when the detected temperature is outside the allowable range temperature. In a temperature abnormality detection device for freezers and refrigerators that outputs and notifies the occurrence of an abnormality, means for measuring the time during which the detected temperature is outside the allowable range temperature, and means for calculating the difference between the detected temperature and the allowable range temperature. and a means for calculating the product of the measured time and the calculated temperature difference at that time, and outputting an abnormal signal when the calculated result exceeds a preset value. Temperature abnormality detection device. 2. The means for outputting the abnormality signal calculates the product of the unit time and the calculated temperature difference at the time of measurement every preset predetermined unit time, and further calculates the integrated value of the product at that time. 2. The temperature abnormality detection device for a freezer/refrigerator according to claim 1, wherein the temperature abnormality detection device for a freezer/refrigerator outputs an abnormality signal when the calculated result exceeds a preset value. [Claim 3] Even if the product is a value lower than a set value,
3. A temperature abnormality detection device for a freezer/refrigerator according to claim 1, further comprising means for outputting an abnormality signal when the detected temperature continues to be outside the permissible range for a predetermined period of time.