JPH0424480A - Load amount indicating device for cooling and storing chamber - Google Patents

Abstract

PURPOSE:To inform the amount of load with respect to the cooling capacity of a cooling store chamber to an user to permit the control of the amount of load in the chamber by the user by a method wherein the value of temperature reduction in a predetermined period of time is detected and the value of temperature reduction is compared with a reference temperature reduction value whereby the actual amount of load with respect to a reference amount of load is compared and indicated. CONSTITUTION:When a refrigerant compressor 1 is ON condition under ON/OFF cycle operation and a door is closed for more than 1min, a temperature reducing value DELTATR in a predetermined period of time of 30sec is detected and is stored into a RAM 12 while the temperature reducing value DELTAATR is compared with the reference temperature reducing value DELTATMR of existing data whereby an actual amount of load with respect to a reference amount of load is indicated in a LED 15 by the number of lightening lamps. When defrosting operation is effected or the case except above-described operation, a condition before that is indicated in the LED 15 by the number of lightening lamps. The actual amount of load with respect to the reference amount of load is informed by the indication of such LED 15 while an user judges the existence of excessive cooling capacity at that time based on the informations whereby the receiving amount of food stuff or the like in a refrigerator can be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a load amount display device for a cooling storage that displays an actual load amount relative to a standard load amount.

(B) Conventional technology In the conventional technology described in Japanese Utility Model Application Publication No. 164498/1985, which precedes the present invention, if the internal temperature of the refrigerator does not drop to a predetermined value, a warning indicator is turned on to indicate an abnormal condition. is displayed.

However, this type of conventional technology only displays an abnormal state, and has the disadvantage that it cannot accurately display to the user the actual load amount relative to the standard load amount in the refrigerator.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks and displays the actual load amount with respect to the standard load amount in the refrigerator, thereby determining the amount of load relative to the cooling capacity of the cooling storage. The system notifies the user of the temperature and allows the user to adjust the load inside the refrigerator, thereby allowing foods and the like to be stored at optimal temperatures without suffering from various adverse effects.

(d) Means for Solving the Problems The present invention provides a refrigerated storage warehouse in which the temperature inside the refrigerator is maintained within a predetermined temperature range by detecting the internal temperature with a temperature sensing element and controlling the refrigeration device on and off. By detecting a temperature drop value over a predetermined time within a temperature range and comparing this temperature drop value with a standard temperature drop value, the actual load amount is compared and displayed on the display device with respect to the standard load amount.

(E) Effect According to the present invention, when the load of the cooling storage changes due to overfilling of food etc. to the cooling storage or changes in the outside temperature, the load amount changes compared to the cooling capacity of the cooling storage. The user can therefore easily adjust the food storage amount while having a good impression of the temperature control mechanism with respect to said display device corresponding to various environmental conditions.

(f) Example Next, one embodiment of the present invention will be described.

In FIG. 1, (1) is a refrigerant compressor, which constitutes a part of the refrigeration system provided in the main body of the storage.

(2) is an oscillator that supplies clock pulses to the central processing unit (3). (4) is a door switch that is linked to the opening and closing of the door of the storage main body, and supplies its output signal to the interface (5). (6) is a temperature sensing element for detecting the temperature inside the refrigerator, (7) is a defrosting end temperature sensing element for detecting the end of defrosting of the refrigeration apparatus, and (8) is an input section for setting the temperature inside the refrigerator. The detection signals of each of the elements (6), (7), and (8') are A/
The signal is converted into a digital signal via the D converter (9) and further supplied to the central processing unit #A (3) via the interface (10). The central processing unit (
3) has a ROM (11) and a RAM (12), performs calculations based on various data detected by each of the elements (6), (7), (8), etc., and sends the calculation result signal to the driver (13).
) (14) respectively, and these drivers (1
3) It functions to drive the refrigerant compressor (1) and the display device (15) by (14). The display device t (1
5) is composed of seven LEDs, etc., as described later.

Figure 2 shows a comparison of the actual temperature characteristic curve (R) with the standard temperature characteristic curve (M), with the vertical axis representing the internal temperature (c) and the horizontal axis representing time (1). .

The standard temperature characteristic curve (M) is for a case where the internal load amount is normal, specifically, when the internal load amount matches the cooling capacity of the cooling storage. The temperature characteristic curve (R) (M
), the refrigerant compressor (1) is turned on at Te3 point, which is 2°C higher than the internal temperature set value TCI, and turned off at Te3 point, which is 2°C lower, thereby maintaining the temperature within a predetermined temperature range of 4°C. △
TR is a predetermined time (30 seconds) in the temperature range of 4°C.
This is the temperature decrease value in (TR1 to TR2), which is detected by the temperature sensing element (6) and the like. △TMR is the temperature decrease value of the standard temperature characteristic curve (M) in the predetermined time (30 seconds) (TR1 to TR2) corresponding to the predetermined time (30 seconds) (TR1 to TR2), and O , data memory ROM at I”C intervals.
(11).

FIG. 3 is a flowchart showing the structure and operation of the load amount display device.

In the load amount display device, as soon as the power is turned on,
The temperature data inside the refrigerator is detected by the temperature sensing element (6) and the R
The display data is stored in the TRI area of AM (12), clears the TRI change counter TCOI, door opening/closing counter TCO2, and defrost counter TCO3, and also lights up four of the seven LEDs in sequence in RAM (12). )'s LD
Store in area.

Next, the temperature data inside the refrigerator detected by the temperature sensing element (6) is RA
M (12) is stored in the TR2 area, and the output signal of the indoor temperature setting input section (8) is stored in the A/D converter (9).
), and the set temperature data set at this internal temperature setting input section (8) is stored in the TS area of the RAM (12).

Next, the state of the defrost counter TCO3 that has accumulated the operating time of the refrigerant compressor (1) is detected, and if the accumulated time is 8 hours or more, it is determined that the defrosting operation is in progress, and the defrost control flag C2 is detected. Set the refrigerant compressor charge 11 and reset the flada CO, and also set the temperature sensing element (6) for detecting the defrosting end temperature to 10.
℃ or more, the defrosting counter TCO3 is cleared and P] is reached, and if the cumulative time is less than 8 hours, it is determined that the defrosting operation is not in progress and the defrosting control flag C2 is reset.

After resetting the defrosting control flag C2, RAM (1
Calculations are performed between the data TR2 and the temperature set value data TS in 2), and the flags are changed as follows based on the results.

If TR2-TS≧2℃, refrigerant compressor control flag CO
Set.

If TS-TR2≦2℃, refrigerant compressor control flag CO
Reset.

If the relationship between TS and TR2 is other than the above, the refrigerant compressor control flag CO is maintained at the previous state.

In the case of TR2≦TS+2°C, a flag C1 is set to start on/off cycle operation within a predetermined temperature range of ±2°C.

If TR2>TS+2°C, the operation start flag CI of the on-off cycle is reset.

Next, the states of the refrigerant compressor control flag CO and the on/off cycle operation start flag C1 are detected, and if at least one of them is in the reset state, Pl is reached.

If the flags Co and CI are both set,
It is determined that the refrigerant compressor (]) is on and in off-cycle operation, and the process moves to detecting the state of the door switch (4), and when the door is closed, the door open/close flag C3 is set. set, and if it is not closed, the door open/close flag C3
Clear the door opening/closing counter TCO2 by resetting the
reach. Even if the door is closed, if it has not been open for more than 1 minute, the door open/close counter T
Judging by CO2, PI is reached.

Next, the TRI change counter TCO1 is used for a predetermined period of time (3
0 seconds) has elapsed, and if it has not elapsed, the TRI change flag C4 is set and P2 is reached.

If the predetermined time (30 seconds) has elapsed, calculation is performed between the internal temperature data TRI and TR2.

Specifically, TRl-TR2 is calculated, and the actual temperature drop value as the calculated value △TR is RAM (1
2). Further, the data of the standard temperature characteristic curve (M) that has already been stored is retrieved from the ROM (11), and from this data the predetermined time period (30 seconds) (TRMI to TRM
Extract the data corresponding to 2) and calculate the standard temperature drop value △
It is stored in RAM (12) as TMR data. Furthermore,
The calculation ΔTMR−ΔTR=SD is performed, and the LD data in the RAM (12) is changed as follows based on this SD value.

If SD > 3℃, 7 of the I-EDs installed in parallel will light up in order.

If 3℃≧SD>2℃, 6 LEDs will light up in the same way.

If 2°C≧SD>1°C, similarly, E I) 5 lights.

If 1°C≧SD>-1'C, 1 I-E D- is lit in the same way.

If ℃≧SD＞-2℃, 3 LEDs will light up in the same way.

If ℃≧SD＞-3℃, 2 LEDs will light up in the same way.

If SD≦-3°C, change to one LED lighting.

Next, the data TR2 in the RAM (12) is stored in the TRI, the TRI change counter TCO1 is cleared, and the TRI change flag C4 is reset.

Next, the compressor control flag CO is set to the central processing unit (3).
) to control the refrigerant compressor (1), and the RAM
Output the data LD from (12) and ED (15)
to reach PO.

As shown in (L) above, the load amount display device displays the refrigerant compressor (
1) enters on-off cycle operation and is in the on state and the door is closed for more than 1 minute, detects the temperature drop value ΔTR for a predetermined time (30 seconds) and stores it in RAM (12). By comparing the temperature drop value ΔTR with the standard temperature drop value ΔTMR of existing data, the actual load amount relative to the standard load amount is displayed by the number of LEDs (15) lit. In addition, when the cooling storage is in defrosting operation or in cases other than the above, the previous state is L E D (1
5) Displays the number of lights on. The display of L E D (15) notifies the actual load amount relative to the standard load amount, and based on this notification information, the user can judge whether or not there is a margin in the cooling capacity at the time and store food, etc. The amount of storage inside can be adjusted.

In addition, in the load amount display device, the TRI change counter TC
O1 counts up when the TRI change flag C4 is set, stops counting after a predetermined time (30 seconds) and holds the count, and also defrost counter TC.
O3 counts up when the refrigerant compressor control flag CO is set, stops counting after 8 hours, and holds the count.

(G) Effects of the Invention Since the present invention is configured as described above, when the load amount of the cooling storage changes due to overfilling of the cooling storage, etc. or changes in the outside temperature, the load amount changes to the cooling of the cooling storage. ability to be displayed on the display device, thus giving the user an excellent impression of the temperature control mechanism with respect to said display device corresponding to various environmental conditions, and therefore with excellent display capabilities. It is possible to provide a load amount display device for a cooling storage that can easily notify a user of the amount of load inside the refrigerator and whether or not there is a surplus in cooling capacity.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a characteristic diagram of the internal temperature of a refrigerated storage warehouse equipped with the same embodiment, and FIG. 3 is a flowchart of an embodiment of the present invention. (6)...Temperature sensing element, (15)...Display device, (△
TR)...Temperature drop value, (△TMR)...Standard temperature drop value.

Claims (1)

[Claims] (1) In a refrigerated storage warehouse in which the internal temperature is maintained within a predetermined temperature range by detecting the internal temperature with a temperature sensing element and controlling the refrigeration system on and off, detecting the temperature drop value in the predetermined time within the temperature range. A load display device for a cooling storage, characterized in that the display device compares and displays the actual load amount with respect to the standard load amount by comparing this temperature drop value with a standard temperature drop value.