JPH02197784A - 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 a pressure in a cooling system by means of a defrosting period deciding means and an integrating timer, and automatic switching operation is effected. CONSTITUTION:A title control device is formed such that defrosting periods during the daytime and the night are switched between each other by means of first and second switches 24 and 25, and when defrosting operation during the night is set once by a 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, during operation in the daytime, a pressure in a cooling system is detected by a pressure sensor 30, and a pressure P1 is compared with a pressure P0 inputted to a pressure deciding means 31 by a pressure deciding means 31. A time in which it is decided that P1 is higher than P0 is counted by a computing timer 32, 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 effected according to operation time during the daytime.

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 control device for a showcase or the like mentioned above will be described below with reference to the drawings.

FIG. 3 is a block diagram of a conventional Schiller case control device, and FIG. 4 is an operation 70-chart thereof.

In FIG. 3, 1 is an evaporator temperature detection means for detecting the temperature of the evaporator, and 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. 4
is a defrosting timer that sets the defrosting time, and receives the signal from the defrosting start control means 3 as input. 6 is a first control means which inputs the signals of the defrost start control means 3 and the defrost timer 4;
controls the defrost heater.

Reference numeral 7 denotes a refrigerator temperature detection means for detecting the temperature inside the refrigerator. 8
The control temperature setting means sets a target temperature for control 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.

10 is a second control means which includes the first control means 5 and the comparison means 9.
The signal is input to control 11 compressors.

The operation of the showcase control device configured as described above will be explained below using the operation flowchart of FIG. 4.

First, when the power is turned on, the defrosting cycle timer 2 starts operating in step (the integrated time of the defrosting cycle timer is set to to). Next, in step b, the internal temperature detection means 7 and the control temperature setting means 8 each determine the internal temperature T.

and the control target temperature T1 are manually input to the comparison means 9, and in step C, the comparison means 9 compares the internal temperature T0 and the control target temperature T1, and if formula (1) is satisfied, the The signal S1 is output to the control M11 means 1o of No. 2, and the compressor 11 is turned ON L. Otherwise,
Turn off the compressor 11.

To〉T1 ・・・・・・・・・・・・
(1) Next, in step e, input the defrost cycle timer 2 to the defrost cycle timer cumulative time 70 to the defrost start control unit 3, and set the defrost cycle timer cumulative time 70 to the defrost start control unit 3. If the defrosting cycle time t1 is satisfied, the process proceeds to step f. Otherwise, the logic proceeds to step b.

t0≧t1・・・・・・・・・・・・
......@) In step f, the evaporator temperature T2 is input from the evaporator temperature detection means 1 to the defrosting start control means 3, and in step q, the defrosting start control means 3 sets the evaporator temperature T2 in advance. If the defrosting start temperature T3 is satisfied, the process proceeds to step h. Otherwise, the logic proceeds to step a.

T2<T3・・・・・・・・・・・・
(3) In step h, the defrost start control means 3 outputs the signal S2 to the defrost time timer 4, and the count of the defrost time timer 4 is started. t2).

Next, in step 1, the defrost start control means 3 outputs a signal S to the first control means 5, outputs a signal S4 to the defrost heater 6 and second control means 1o, and turns off the compressor 11. Start frost operation. Next, in step J, the defrosting time timer cumulative time t2 is input from the defrosting time timer 4 to the first control means 5, and the
The defrost time t3 set in the control means 5 is compared with the defrost time t3 set in the control means 5, and if formula (4) is satisfied, the defrost heater 6 is advanced to ○FFL step a in step k, otherwise, the process goes to step i. Advance the logic.

t2≧t3 Problem to be Solved by the Invention However, in the above-mentioned conventional configuration, the amount of frost formation is The defrosting operation is more likely to be started in the living room, where there are many rooms, which has the drawback of causing the temperature inside the showcase to rise during business hours in the living room.

The present invention solves the above-mentioned conventional problems, and automatically switches the defrosting cycle at night to reduce the frequency of defrosting during business hours in the living room. It is an object of the present invention to provide a control device for a showcase that prevents an increase in the internal temperature of an L-case.

Means for Solving the Problems To achieve this object, the S/Yaw case control device of the present invention comprises a first switch and a second switch, respectively, for starting and canceling the night operation of the showcase, and a cooling system. a pressure sensor that detects the internal pressure, a pressure determination means that receives the signal from the pressure sensor as an input, an evaporator temperature detection means that detects the temperature of the evaporator, and the first switch and the second switch. The signal is input. a switch input determining means; a first timer receiving a signal from the switch input determining means; a second timer receiving a signal from the first timer; a switch input determining means;
A defrosting system using the timer and second timer signals as inputs.
a defrosting cycle determining means which receives the signals of the integration timer and the defrosting mode determining means; a defrosting cycle timer which receives the signals of the defrosting cycle determining means; The defrost control means receives a signal from a defrost period timer and controls a defrost heater.

Effect: With this configuration, the defrosting cycle determining means and the integration timer can set the defrosting cycle separately for the home and at night, depending on the pressure within the cooling system, and automatically switch the operation.

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 20 denotes an internal temperature detection means for detecting the internal temperature of the refrigerator, which outputs a signal S1°, and 21 a side-turning temperature setting means for setting an opening/opening target temperature, which outputs a signal S11. ,2
Reference numeral 2 denotes a comparing means which inputs the signals "10" and "S11" from the internal temperature detecting means 20 and the control@temperature setting means 21, and outputs a signal S12.

23 is a first control means, which receives the signal S1 from the comparison means 22;
Enter ゜. 24 is a "th switch" which outputs a signal S13 indicating the start of night defrosting operation.

26 is a second switch that outputs a signal S14 indicating cancellation of the night defrosting operation. Reference numeral 26 denotes switch input determination means, which detects the signal S from the first switch 24 and the second switch 25.
13 and signal S14 are input, and signals S and 6 are output. 2
7 is a first timer which inputs the signal S16 from the switch input determination means 26 and outputs the signal "16"; 28 is a second timer which inputs the signal $16 from the first timer 27 and outputs the signal S1 Outputs □. 29 is a defrosting mode determining means;
Signal Sf from the first timer 27 and second timer 28
6 and S1□ and outputs a signal S18. 30 is a pressure sensor that outputs a signal S19. Reference numeral 31 denotes pressure determination means, which inputs No. 13 S19 from the pressure sensor 30 and outputs a signal S2°. 32 is an integration timer that inputs the signal from the defrosting mode determining means 29 (this signal is input to the signal S
18). The signal 533 that outputs the signal 21 receives the signal S18 from the defrosting mode determining means 29 and the signal 21 from the integration timer 32, and outputs the signal S2□. 32 is a defrosting cycle timer which inputs the signal JiJ-822 from the defrosting cycle determiner 833 and outputs a signal S23. 3
Reference numeral 5 denotes an evaporator temperature detection means for detecting the temperature of the evaporator, which outputs a signal S24.

36 is a defrosting start control means which inputs the respective signals S from the defrosting cycle timer 34 and the evaporation AG temperature detecting means 36, and outputs a signal S25.

23 + 24 37 is the defrosting timer and the signal S from the defrosting start restriction means 36
26 and outputs a signal S26. 38 is a second control means which inputs the signals S26 and "28 from the defrost start control means 36 and the defrost timer 37, and outputs the signal S2□.Here, the defrost start control means 36, the defrost timer 37
The 20th control means 38 is referred to as a defrosting control means 39. 4
0 is a defrost heater, which is controlled by υ○N10FF by a signal S27 from the second control means 38. 39 is a compressor, the first control means 23 is the comparison means 22. Respective signals S12 and 27 from the second control means 38
0N10FF control is performed by the input and output signal S29.

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

First, when the power is turned on, the signal S13 from the first switch 24 is inputted to the switch input determination means 26 in step 1, and it is determined whether or not the first switch 24 has a force υN. If is ON, proceed to step 2; otherwise, proceed to step 6. In step 2, the switch input determining means 26 outputs the signal $16' as the first signal.
is output to the timer 27, and the first timer 27 starts (the count time of the first timer 27 is set to time t1°). Next, in step 3, the first tie-r27
The signal S16' is outputted to the second timer 28, and the second
The timer 28 starts (the count time of the second timer 280 is set to time '11). Next, in step 4, the defrosting mode determining means 29 receives the signals S", S", and S1□ from the switch input determining means 26, the first timer 27, and the second timer 28, respectively, and The mode is set to night. Next, in step 6, the signal 521 from the integration timer 32 (at this time, the count time of the integration timer 32 is set to time t12),
The signal 818' from the defrosting mode determining means 29 is input to the defrosting cycle determining means 33, and the timer time (this is referred to as t13) of the defrosting cycle timer 34 is determined by the calculation formula shown in equation 4. The timer time t at this time is defined as the nighttime defrosting cycle timer time t14.

t = f(t12) ・・・・・・・・・
...I) Here, f(t12) is the integration timer 32
This is a function determined by the count time t12.

Next, in steps etc., the switch input determination means 26
The signal S14 from the second switch 26 is inputted to the step 26, and it is determined whether or not the second switch 26 is turned on. If the second switch 26 is turned on, the process proceeds to step 7. Otherwise, the process proceeds to step 12. .

Next, in step 7, the switch input determination means 26
A signal S16' is output from the first timer 27 to the first timer 27.
The timer 27 is reset. Next, in step 8, the first timer 27 sends the υ signal S16' to the second timer 28.
and the second timer 28 is reset. Next, in step 9, the defrosting mode determining means 29 includes the switch input determining means 26, the first timer 27, and the second type 2.
8 to signal 816'', signal S16//, signal S
1□ is input, and the weight removal/6 mode is determined for the living room.

Next, in step 1o, the defrosting mode determining means 29 outputs a signal S18' to the integration timer 32, and the integration timer 32 is reset.

Next, in step 11, the signal 818' from the defrosting mode determining means 29 is input to the defrosting period determining means 33, and the timer time t13 of the defrosting period timer 34 is set to the living room defrosting period timer '15. Next, in step 12, the defrosting mode determining means 29 receives the signal 81 from the first timer 27.
6' is input to check whether the first timer 27 is counting or in the reset state. If it is counting, the logic advances to step 4; if it is in the reset state, the logic advances to step 9.

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

Next, in step 14, the internal temperature detection means 20 and the control temperature setting means 21 input the signal S1° and the signal S11 to the comparison means 22, respectively.

The internal temperature at this time is "10", and the control target temperature is "il". In step 16, the inner thickness temperature T1° and the control target temperature T11 are compared, and if the formula 6) is satisfied, the process proceeds to step 16; otherwise, the process proceeds to step 18.

T10＞”11 ・・・・・・・・・
(6) In step 16, the comparison means 22
As a result, the signal S1° is outputted to the first control means 23, and the signal S28 is outputted from the first control means 23 to the compressor 41, which turns on the compressor 42. Next, in step 17, the pressure sensor 3o outputs the pressure P1 in the cooling system as a signal S19. Next step 1
At step 8, the pressure determining means 31 detects the signal 519 (pressure is P) output from the pressure sensor 30 and the pressure P input into the pressure determining means 31 in advance. If the equation (e) is satisfied, the process proceeds to step 19; otherwise, the process proceeds to step 21.

Pl〉Po・・・・・・・・・・・・
...(7) In step 19, the pressure determination means 31
A signal S2o is output from the integration timer 32 to the integration timer 32, and the integration timer starts counting (count time t12).

Next, in step 2o, the comparison means 22 sends the signal S12 to the first control means 23.
8 is output to the compressor 41 and turns off the compressor 41. Next, in step 21, the pressure determination means 31
A signal S21 is output from the integration timer 32 to stop the integration timer 320 counting.

Next, in step 22, the signal S23 from the defrosting cycle timer 34 is input to the defrosting start control means 36, and it is determined whether or not the timer time '13 of the defrosting cycle timer 34 is counting. If the count has increased, the defrosting cycle timer 34 is reset in step 23 and the process proceeds to step 24. If the count has not increased, the logic returns to step 14.

Next, in step 24, the evaporator temperature detection means 35 pass signal S24 is input to the defrosting start control means 36. The temperature of the evaporator at this time is set to 12. Then, in step 25, the evaporator temperature T1□ is compared with the defrosting start temperature T13 preset in the defrosting start control means 36.
), the logic proceeds to step 25; otherwise, the logic proceeds to step 1.

T1゜＜T13・・・・・・・・・・・・
...) In step 26, a signal S26' is output from the defrosting start control means 36 to the defrosting timer 37,
Counting of the defrosting timer 37 is started (the accumulated time of this defrosting timer 37 is set as ti6). Next step 2
At step 7, the defrosting start control means 36 and the second control means 38
A signal 826' is outputted from the second control means 38 to the defrost heater 40, and the defrost heater 4o is energized. \Signal 82□' is the first
The control means 23 outputs a signal S28 to the compressor 41 to stop the compressor 41 and start defrosting operation.

Next, in step 28, the signal $26 is input from the defrost timer 37 to the second control means 38, and the defrost timer 37
If the cumulative time t16 satisfies the equation 9) compared with the depletion time t17 set in advance in the second control means 38, in step 29, the defrost heater 4o
The second control means 38 outputs a signal 82□' to stop the defrost heater 40 and proceeds to step 3o. Otherwise, the logic proceeds to step 27.

th18≧t1□・・・・・・・・・
(9) In step 3o, the second timer 28 inputs the signal S1□ to the defrosting mode determining means 29, and sets the count time t11 of the second timer 28 and the defrosting mode in advance. The time set in the determining means 29'
18, if the equation (1o) is satisfied, the second timer 28 is reset and the process proceeds to step 31; otherwise, the logic proceeds to step 6.

t11≧'18 ・・・・・・・・・・・・
...(1o) Next, in step 31, the signal S16' from the first timer 27 is inputted to the defrosting mode determining means 29, and the count time t1° of the first timer 27 is The time t19 (24 hours) set in the 6-mode determining means 29 is compared, and if the formula (11) is satisfied, the integration timer 32 is reset in step 32, and the first timer 27 is also reset. and restarts to step e. Otherwise, the logic proceeds to step 11.

t1o≧t19 (24 hours) ・・・・・・・・・・・・
(11) As described above, the first switch 24 and the second switch 25 that input the start and release of the night defrosting operation, and the pressure sensor 30 that detects the pressure inside the cooling system.
, a pressure determining means 31 which receives the signal from the pressure sensor 3o, a switch input determining means 26 which receives the signals from the first switch 24 and the second switch 26, and a signal from the switch input determining means 26. First timer 2 as input
7 and a second timer 28 whose input is the first timer 27.
and defrosting mode determining means 29 which receives signals from switch input determining means 26, first timer 27 and second timer 28, and defrosting mode determining means 29 which receives signals from integration timer 32 and defrosting mode determining means 29. By providing the frost cycle determining means 33, the first switch 24 and the second switch 26
The defrosting cycle of Reiya can be changed by the first timer 27 and the second timer 28.
When the nighttime defrosting operation is set in step 4, the nighttime defrosting operation can be automatically performed at the same time every day. Furthermore, the pressure inside the cooling system is detected by the pressure sensor 3o during the stimulative operation, and the detected pressure P1 and the pressure P input into the pressure determination means 31 in advance. The pressure determining means 31 compares Pl with Po, and the integration timer 32 counts the time when Pl is larger than Po, and the nighttime defrosting time period t14 can be arbitrarily changed based on the time t12.
At night, four-turn defrosting can be carried out intensively according to the operating time in the living room, reducing the frequency of defrosting in the living room and preventing a rise in the temperature inside the showcase or the like.

Effects of the Invention As described above, the present invention includes a first switch and a second switch for respectively starting and canceling the night operation of the cooling system, and a pressure case/suction unit for detecting the pressure in the cooling system.
pressure determining means receiving a signal from the pressure sensor; evaporator temperature detecting means detecting the temperature of the evaporator;
switch input determination means that receives signals from the switch and the second switch; a second timer that receives the signal from the first timer; switch input determination means; a first timer and a second timer; a defrosting mode determining means receiving as input the signals of the defrosting mode determining means; an integrating timer receiving the signals of the pressure determining means and the defrosting mode determining means as input; and a defrosting device receiving the signals of the defrosting mode determining means and the integrating timer as inputs. A defrosting cycle timer that receives signals from the cycle determining means and the defrosting cycle determining means, and a defrosting control that receives signals from the evaporator temperature detecting means and the defrosting cycle timer and controls the defrost heater. By inputting a switch, you can change the defrosting cycle at night, and by setting the timer to -degrees, you can automatically defrost at night at the same time every day. The pressure can be detected and changed depending on the time to count that the pressure is above a certain pressure, and with an appropriate defrost cycle at night,
The purpose of the present invention is to realize a control device for a showcase that can perform intensive defrosting, reduce the frequency of defrosting in the living room, 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 70-chart of the showcase control device according to an embodiment of the present invention, and FIG. 3 is a conventional showcase control device. FIG. 4 is a block diagram of the control device of the conventional showcase, and FIG. 4 is an operation flowchart of the conventional control device of the showcase. 24...first switch, 26...second switch, 26...switch input determination means, 27...first timer, 28... . . . Second timer, 29 . . . Defrosting mode determining means, 3
0...Pressure sensor, 31...Pressure determination means, 32...Integration timer, 33...
Defrosting cycle determining means, 34...Defrosting cycle timer 3
6...Evaporator temperature detection means, 39...
Defrost control means, 4o... Defrost heater. Name of agent: Patent attorney Shigetaka Awano and 1 other person 2nd
Diagram (Part 2) Kazu

Claims (1)

[Claims] a first switch and a second switch for respectively starting and canceling the nighttime operation of the showcase; a pressure sensor for detecting the pressure within the cooling system; a pressure determining means that receives a signal from the pressure sensor; evaporator temperature detection means for detecting the temperature of the evaporator, the first switch and the second switch;
a first timer receiving a signal from the switch input determining means; a second timer receiving a signal from the first timer; a defrosting mode determining means which receives as input the signals of the switch input determining means and the first timer and the second timer; an integration timer which receives the signals of the pressure determining means and the defrosting mode determining means; and the defrosting. a defrosting cycle determining unit that receives the signals from the mode determining unit and the integration timer; a defrosting cycle timer that receives the signals from the defrosting cycle determining unit;
A control device for a showcase, comprising: the evaporator temperature detection means; and a defrost control means that receives a signal from a defrost cycle timer and controls a defrost heater.