JPH02197785A - Control device for show case - Google Patents

Abstract

PURPOSE:To reduce defrosting frequency in business hours during the daytime and to prevent the increase of the temperature in a chamber of a show case by a method wherein a defrosting period during the daytime and that during the night are individually set according to the coefficient of operation of a compressor by means of a defrosting period deciding means and an integrating timer, and automatic switching operation is performed. CONSTITUTION:In a title control device, defrosting periods during the daytime and during the night are switched by means of first and second switches 24 and 25. When defrosting operation during the night is set by the first switch 24 by means of first and second timers 27 and 28, defrosting operation during the night can be effected automatically daily at the same time. Further, an operation time of a compressor 39 during daytime operation is counted by an integrating timer 30, and a defrosting time period t14 during the night can be arbitrarily varied according to a time t12. During the night, defrosting operation can be concentratedly performed according to operation time during the daytime, a defrosting frequency during the daytime can be reduced, and the temperature in a chamber of a show case can be prevented from increasing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for controlling the defrosting operation of a showcase.

BACKGROUND OF THE INVENTION In recent years, several types of electronically controlled defrosting operations have been used in showcases.

An example of the conventional showcase control device described above will be described below with reference to the drawings.

FIG. 3 is a block diagram of a conventional control device for a showcase, etc., and FIG. 4 is an operation flowchart thereof.

In FIG. 3, 1 is an evaporator temperature detection means for detecting the temperature of the evaporator. 2 is a defrost cycle timer that counts the defrost cycle time. Reference numeral 3 denotes defrosting start control means, which receives signals from the evaporator temperature detecting means 1 and the defrosting cycle timer 2 as input. A defrosting timer 4 counts the defrosting time, and receives the signal from the defrosting start control means 3 as an input. Reference numeral 5 denotes a first control means, which receives signals from the defrost start control means 3 and the defrost timer 4, and controls the defrost heater 6.

Reference numeral 7 denotes a refrigerator temperature detection means for detecting the temperature inside the refrigerator. 8
The control temperature setting means sets the control temperature target value inside the refrigerator. Reference numeral 9 denotes a comparison means which inputs signals from the chamber temperature detection means 7 and the control temperature setting means 8.

Reference numeral 10 denotes a second control means, which inputs signals from the first control means 5 and comparison means 9, and controls the compressor 11.

The operation of the controller for a showcase or the like constructed as described above will be explained below using the operation flowchart shown in FIG.

First, when the power is turned on, the defrosting cycle timer 2 starts operating in step a (the integrated time of the defrosting cycle timer is set to to). Next, in Mechitsubu b, the internal temperature detection means 7 and the control temperature setting means 8 respectively detect the internal temperature T0.
and the control target temperature T1 are input to the comparison means 9, and in step C, the comparison means 9 multiplies the internal temperature T0 and the control target temperature T1 by 1, and if the formula (1) is satisfied, step d is performed. A signal S1 is outputted to the second control means 1o, and the compressor 11 is turned ONL, and in other cases, the compressor 11f is turned OFF.

To〉T1 ・・・・・・・・・・・・
...(1) Next, in step e, the defrosting start control means 3 receives the defrosting cycle timer 2 and the defrosting cycle timer cumulative time t.
.

is input and compared with the defrosting cycle time t1 set in advance in the defrosting start control means 3. If the expression (2) is satisfied, the logic advances to step f; otherwise, the logic advances to step b.

to≧t1 ・・・・・・・・・Mountain・
- (2) In step f, the evaporator temperature detection means 1
evaporator temperature T2 is input to the defrosting start control means 3,
In step q, the defrosting start control means 3 compares the temperature with the preset defrosting start temperature T3, and if the formula 3) is satisfied, the logic proceeds to step h; otherwise, the logic proceeds to step d.

T2<T3 ・・・・・・・・・・・・
...(3) In step h, the defrosting start control means 3
A signal S2 is output to the defrosting time timer 4, and the counting of the defrosting time timer 4 is started (the integrated time of the defrosting time timer 4 is set as t2). Next, in step i, the defrost start control means 3 outputs a signal S3 to the first control means 5, turns on the defrost heater 6, and at the same time outputs a signal S4 from the first control means 5 to the second control means 10. is output, the compressor 11 is turned off, and the L defrosting operation is started.

Next, in step (, the defrosting time timer integrated time t2 is input from the defrosting time timer 4 to the first control means 5, and the defrosting time t2 set in advance in the first control means 5 is inputted.
If the equation (4) is satisfied, the defrost heater 6 is turned off in step k and the logic proceeds to step a. Otherwise, the logic proceeds to step i.

t2≧t3 ・・・・・・・・・・・・
(4) Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, since the cold and night combination operation is repeated every defrosting cycle time t1 preset in the defrosting start control means 3, the M The present invention solves the above-mentioned problems of the prior art.The defrosting operation is more likely to be started in the living room where there is a large amount of frost, leading to an increase in the temperature inside the showcase during business hours in the living room. The purpose of the present invention is to provide a control device for a showcase that automatically switches the defrosting cycle at night when the user is in the room, reduces the frequency of defrosting during business hours in the living room, and prevents the temperature inside the showcase from rising. shall be.

Means for Solving the Problem To achieve this object, the showcase control device of the present invention includes a first switch and a second switch, respectively, for starting and canceling nighttime operation of the showcase, and a compressor operating time. evaporator temperature detection means for detecting the temperature of the evaporator; switch input determination means for receiving signals from the first switch and the second switch; and the switch input determination means. a first timer inputting the signal of the first timer; a second timer inputting the signal of the first timer; a switch input determining means;
a defrosting mode determining means that receives signals from the timer and the second timer; a defrosting cycle determining means that receives signals from the integrating timer and the defrosting mode determining means; and a signal from the defrosting cycle determining means. The defrost cycle timer receives a signal from the defrost cycle timer as an input, the evaporator temperature detecting means, and a defrost control means receives a signal from the defrost cycle timer as an input and controls a defrost heater.

Function: With this configuration, the defrost cycle determining means and the integration timer can set the defrost cycle separately for storms and nights, depending on the operating rate of the compressor, and automatically switch the defrost cycle.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a showcase control device according to an embodiment of the present invention, and FIG. 2 is an operation flowchart thereof.

In FIG. 1, reference numeral 2o indicates an internal temperature measuring means for detecting the internal temperature of the refrigerator and outputs a signal S1o. 21 is a control temperature setting means for setting a control target temperature, and 622 outputs a signal S1□.
is a comparison means which inputs the signals S1o and S11 from the internal temperature detection means 20 and the control temperature setting means 21, and outputs the signal JriS12. 23 is a first control means to which the signal S12 from the comparison means 22 is input. 24 is a first switch, and a signal indicating the start of night defrosting operation, r, 3;
Outputs S,3. 25 is a second switch which outputs a signal S14 indicating cancellation of the night defrosting operation. Reference numeral 26 denotes switch input determination means, which inputs the signal S13 and the signal S14 from the first switch 24 and the second switch 26, and outputs the signal S.
Outputs 16. 27 is a first timer which inputs the signal S from the switch input determining means 26 and outputs the signal S16. A second timer 28 inputs the signal S16 from the first timer 27 and outputs a signal S1□. 29 is a defrosting mode determining means which inputs signals S16 and S1□ from the first timer 27 and second timer 28 and outputs a signal S18. 30 is an integration timer which inputs signals from the first control means 23 and the defrosting mode determining means 29 (this signal is referred to as signal S19).

Then, a signal S2° is output. Reference numeral 31 denotes a defrosting cycle determining means, which inputs the signal S18 and the signal S2° from the defrosting mode determining means 29 and the integration timer 30, and outputs a signal S21. 32 is a defrosting cycle timer which inputs the signal S21 from the defrosting cycle determining means 31 and outputs a signal S22. 33 is an evaporator temperature detection means for detecting the temperature of the evaporator, and a signal S2 is provided.
3 is a defrosting start control means which inputs the signals S2° and S23 from the defrosting cycle timer 32 and the evaporator temperature detecting means 33, and outputs a signal S24. A defrosting timer 35 inputs the signal S24 from the defrosting start control means 34 and outputs a signal S26. 36 is a second control means, which includes a defrost start control means 34 and a defrost timer 36.
It inputs the signal S24 and the signal "25" and outputs the signal S26. Here, the defrosting start control means 34 and the defrosting timer 3
5 and the second control means 36 are referred to as a defrosting control means 37.

38 is a defrost heater, which is controlled by the signal S26 from the second control means 36! 1) ON10FF control is disabled.

39 is a compressor, the first control means 23 is the comparison means 22. The respective signal S from the second control means 36
υ0 by the signal S19 which inputs and outputs the signals S2 and S6.
Controlled by N10FF.

The operation of the showcase control device configured as described above will be explained below using the operation flowchart of FIG. 2.

First, when the power is turned on, in step 1, the signal S13 from the first switch 24 is input to the switch input determination 26, and it is determined whether the first switch 24 is turned on or not. If so, proceed to step 2; otherwise, proceed to step 6. In step 2, the switch input determining means 26 outputs the signal S 1s / to the first timer 2T, and the first timer 27 is started. (
The first timer 270 count time is defined as time t1°)
Next, in step 3, the signal 5 from the first timer 27 is
161 is output to the second timer 28, and the second timer 2
8 starts. (The count time of the second timer 28 is assumed to be time t11.) Next, in step 4, in the defrosting mode determining means, the switch input hand means 26. Signals S from the first timer 27 and the second timer 28
15/7m signal S// and signal S17 are input, and the defrosting mode is set to night. Next, in step 5, the signal 52o from the integration timer 3o (the count time of the integration timer 3o at this time is defined as time t12) and the signal S18/ from the defrosting mode determining means 29 are sent to the defrosting cycle determining means 31. The timer time of the defrosting cycle timer 32 (this is set as t13) is determined using the calculation formula shown in equation (5). The timer time t13 at this time is defined as the nighttime defrosting cycle timer time t14.

' 14 = f (t12) """""
--------<Equation Here, f(H2) is a function determined by the counting time t12 of the integration timer.

Next, in step 6, the switch input determination means 26
The signal S14 from the second switch 25 is input to the switch, it is determined whether or not the second switch 25 is turned on, and the second switch 25 is turned on.
If the switch 25 is turned on, the step ends; otherwise, the process goes to step 12.

Next, in step 7, the switch input determination means 26
A signal S 1s / is output to the first timer 2,
The first timer 27 is reset. Next, in step 8, the first timer 27 outputs the multiple signal S16' to the second timer 28, and the second timer 28 is reset.

Next, in step 9, the defrosting mode determining means 29 receives the switch input determining means 26. First timer 27. A signal S tt, a signal S N, and a signal S1□ are inputted from the second timer 28, respectively, and the defrosting mode is determined for the living room.

Next, in step 1Q, the multi-signal S18 from the defrosting mode determining means 29 is output to the integration timer 30, and the integration timer 30 is reset.

Next, in step 11, the signal 818 from the defrosting mode determining means 29 is input to the defrosting cycle determining means 31, and the timer time t13 of the defrosting timer 32 is changed to the living room defrosting cycle timer time t.
Set to 15.

Next, in step 12, the defrosting mode determining means 29
The signal S16 from the first timer 27 is input to
It is checked whether the timer 27 is counting or in the reset state, and if it is counting, the logic advances to step 4, and if it is in the reset state, the logic advances to step 9.

Next, in step 13, the signal S21/ is output from the defrost cycle determining means 31 to the defrost cycle timer 32, and the defrost cycle timer 32 starts counting (timer time t13).
.

Next, in step 14, signals S and S are sent from the chamber temperature detection means 2Q and the control temperature setting means 21, respectively.
11 is input to the comparing means 22, the internal temperature at this time is T1°, and the control target temperature is "11".Step 1
6, the internal temperature T1o and the control target temperature T11
If the formula 6) is satisfied, go to step 16.
Otherwise, proceed to step 18.

T1゜〉T11・・・・・・・・・・・・
...(6) In step 16, the comparison means 22 sends the multiple signal S12 to the first control means 23.
A signal S19/ is output to the compressor 39, turning the compressor 39 ON. Next, in step 17, a signal S19 is sent from the first control means 23 to the integration timer 30.
is output, and the integration timer starts counting (count time t12).

Next, in step 18, the comparison means 22 outputs the signal S.
1□ is outputted to the first control means 23, and a signal S19/ is outputted from the first control means 23 to the compressor 39, turning off the compressor 39. Next, in step 19, a signal S19 is outputted from the first control means 23 to the integration timer 3o, and the counting of the integration timer is stopped.

Next, in step 2o, the signal S22 from the defrosting cycle timer 32 is input to the defrosting start control means 34, and it is determined whether or not the timer time t13 of the defrosting cycle timer 32 is counting. If the count has increased, the defrosting cycle timer 32 is reset in step 21 and the process proceeds to step 22. If the count has not increased, the logic returns to step 14.

Next, in step 22, a signal S23 is input from the evaporator temperature detection means 27 to the defrosting start control means 34. The temperature of the evaporator at this time is assumed to be T12.

Then, in step 23, the evaporator temperature "12" is compared with the defrosting start temperature "13" preset in the defrosting start control means 34, and if the formula (q) is satisfied, step 23
Otherwise, proceed to step 1 3゜TI 2 < T13 ・・・・・・・・・
(7) In step 24, a signal S 24 t is sent from the defrosting start control means 34 to the defrosting timer 35.
is output, and the count of the defrost timer 35 is snorted (the cumulative time of the defrost timer 35 is assumed to be t16). Next, in step 2.5, the defrost control means 34 outputs the second control means 36-・signal S24, the second control means 36 outputs the signal S26/ to the defrost heater 38, and the defrost While energizing the heater, a signal S26 is sent from the second control means 36 to the first control means 23.
A signal S is sent from the first control means 23 to the compressor 39.
19t is output, the compressor 39 is stopped, and defrosting operation is started. Next, in step 26, the second control means 36 receives a signal S2. is entered,
If the cumulative time t16 of the defrost timer 35 is a ratio of 1 to the defrost time t1□ preset in the second control means 36 and satisfies the formula 8), at the end of step 2, a signal is sent to the defrost heater 38. S26/ is output from the second control means to stop the defrost heater, and the logic advances to step 28. Otherwise, the logic advances to step 26.

t16≧t1□ ・・・Pa・・・・・・
- (8) In step 28, the second timer 24 inputs the signal S1□ to the defrosting mode determining means 29, and the second
The count of the timer 24 ↓ time t11 is compared with the time t18 previously set in the defrosting mode determining means 29, and if formula (9) is satisfied, the second timer 28 is reset and the process proceeds to step 2. Otherwise, the logic advances to step 16.

t11≧t18・・・・・・・・・・・・
(9) Next, in step 29, the first timer 27 signal 5161/ is input to the defrosting mode determining means 29, and the count time t1° of the first timer 2γ and the defrosting mode are set in advance. Time t1 set in the determining means 29
9 (24 hours), and if formula (10) is satisfied, the integration timer 3o is reset in step 30, the first timer is reset and restarted, and the process goes to step 6. The logic advances to 11.

t > t (24 hours) ・・・・・・・・・・・・
- (1o) As mentioned above, the first switch 24 and the second switch 25 for inputting the start and cancellation of the night defrosting operation,
an integration timer 3o for accumulating the operating time of the compressuna; a switch input determination means 26 which receives the signals of the first switch 24 and the second switch 25; and a first switch input determination means 26 which receives the signals of the switch input determination means 26. timer 2γ and the first
a second timer 28 whose input is the timer 27; and two defrosting mode determination means whose inputs are the signals of the switch input determination means 26, the first timer 27, and the second timer 28;
The first
The starry night defrosting cycle can be changed by the switch 24 and the second switch 26, and the night defrosting operation can be set by the first timer 27 and the second timer 28. Then, night defrosting operation can be performed automatically at the same time every day. Furthermore, integration timer 30
The operating time of the compressor 39 during operation in the living room is counted, and the night defrosting time period t14 is determined by the time t1□.
can be changed arbitrarily, defrosting operation can be performed intensively at night according to the operating time in the living room,
It reduces the frequency of defrosting in the living room and prevents the temperature inside the showcase from rising.

Effects of the Invention As described above, the present invention includes a first switch and a second switch for starting and canceling the nighttime operation of the showcase, respectively, and an integration timer for integrating the operating time of the compressor.
an evaporator temperature detection means for detecting the temperature of the evaporator; a switch/chi input determination means which receives signals from the first switch and the second switch; and a signal from the mI switch input determination means. a first timer that receives the signal of the first timer as input, a switch input determination means, and a defrosting mode determination unit that receives the signals of the first timer and the second timer as input. a defrosting cycle determining means that receives the signals of the integration timer and the defrosting mode determining means; a defrosting cycle timer that receives the signals of the defrosting cycle determining means; and the evaporator temperature detecting means. By manually inputting the signal from the defrosting cycle timer and providing a defrosting control means that controls the defrost heater, the starry night defying cycle can be changed by inputting a switch, and if set to 91 degrees by timer operation, the defrosting cycle will be set at the same time every day. The defrosting operation can be performed automatically at night, and the defrosting cycle at night can be changed according to the operation time of the living room compressor, and the defrosting can be performed intensively at night at the appropriate defrosting cycle, thereby defrosting the living room. To realize a control device for a showcase that can reduce the frequency and prevent the temperature inside the showcase from rising.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a showcase control device according to an embodiment of the present invention, FIG. 2 is an operation flowchart of a showcase control device according to an embodiment of the present invention, and FIG. 3 is a conventional showcase control device. FIG. 4 is an operational flowchart of a conventional showcase control device. 24...First Nuisochi, 26...Second
switch, 26...Nuinona input determination means,
27...First timer, 28...Second timer, 29...Defrost mode determining means, 30...Integrated evening/f timer, 31...Defrost Cycle determining means, 32...
... Defrost cycle timer 33 ... Evaporator temperature detection means, 37 ... Defrost control means, 38 - ... = Defrost heater. Name of agent: Patent attorney Shigetaka Awano and one other person Figure (Part 3) Figure Figure

Claims (1)

[Claims] a first switch and a second switch for respectively starting and canceling the nighttime operation of the showcase; an integration timer for integrating the operating time of the compressor; an evaporator temperature detection means for detecting the temperature of the evaporator; a switch input determining means that receives signals from the first switch and the second switch; a first timer that receives the signals from the switch input determining means; and a first timer that receives the signals from the first timer. a defrosting mode determining means which receives the signals of the switch input determining means, the first timer and the second timer as inputs, and a defrosting cycle which receives the signals of the integration timer and the defrosting mode determining means as inputs; A defrosting cycle timer that receives the signal from the defrosting cycle determining unit as an input, the evaporator temperature detecting unit, and a defrosting control unit that receives the signal from the defrosting cycle timer as an input and controls the defrost heater. Control device for showcase.