JPH0520663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device for refrigerators, storage cases, etc.

BACKGROUND ART In recent years, electronic technology has made remarkable advances in the control of refrigerators and the like, and temperature control is now performed by electronic control.

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

FIG. 3 is a block diagram of a conventional temperature control device. FIG. 4 is an operation flowchart of a conventional temperature control device.

In FIG. 3, 1 is a temperature detector that detects the temperature inside the refrigerator and outputs a temperature signal _S1 . Reference numeral 2 denotes voltage conversion means which receives the temperature signal _S1 from the temperature detector 1 and outputs a voltage signal _S2 . 3 is a reference voltage generating means which outputs a reference voltage signal _S3 . Reference numeral 4 denotes a comparison means which inputs the voltage signal S 2 of the voltage conversion means ₂ and the reference voltage signal S 3 of the reference voltage generation means ₃ and outputs a determination signal S ₄ . 5 is a delay timer which starts integration at the same time as the power is turned on and outputs a fixed time delay signal _S5 . Reference numeral 6 denotes a control means which outputs a judgment signal from the comparison means 4.
_S4 and the delay signal _S5 of the delay timer 5 are input, and a control signal _S6 is outputted to control the compressor 7.

Regarding the temperature control device configured as above,
The operation will be explained below using the operation flowchart shown in FIG.

First, when the power is turned on, the delay timer 5 starts integration in step 1 and outputs a fixed time delay signal _S5 to the control means 6 until the integration ends. Next, in step 2, the temperature signal _S1 detected by the temperature detector 1 is input to the voltage conversion means 2. Next, in step 3, the voltage conversion means 2 converts the temperature signal _S1 into a voltage signal _S2 ,
The voltage signal _S2 is input to the comparison means 4. Next, in step 4, a reference voltage signal is generated from the reference voltage generating means 3.
Input S ₃ to comparison means 4. Next, in step 5, the comparison means 4 compares the voltage signal _S2 and the reference voltage signal _S3 , and outputs a determination signal _S4 . At this time, the judgment signal S ₄ is a judgment signal S ₄ ' which means that the temperature detected in step 2 is low when formula (1) is satisfied.
As, when formula (2) is satisfied, the judgment signal S ₄ ″ means that the temperature detected in step 2 is high.
The signal is output to the control means 6 as a signal.

S ₂ ≦S ₃ ...(1) S ₂ >S ₃ ...(2) Next, in step 6, when the delay signal S ₅ is input to the control means 6, a control signal is sent to stop the compressor 7. Output S ₆ ', return to step 2,
If the delay signal _S5 is not input, the process advances to step 7. Next, in step 7, the control means 6 issues a control signal S 6 ' to stop the compressor 7 when the judgment signal S ₄ ' is input, and a control signal S ₆ ' to stop the compressor 7 when the judgment signal S ₄ ' is input. A control signal S ₆ ″ for operating the compressor 7 is outputted, and the process returns to step 2.

Problems to be Solved by the Invention However, in the above conventional configuration, the compressor 7
This is effective in terms of protecting the compressor 7 when the compressor 7 is started immediately after an interruption due to a temporary power outage, etc., when the compressor 7 is in operation, but if the Even when the power is turned on, a certain amount of time is required for the compressor 7 to start operating, so cooling cannot be started smoothly, resulting in a drawback that the cooling of the contents, etc., is delayed.

In view of the above-mentioned problems, the present invention detects the temperature of the evaporator to determine the period during which compressor operation is stopped, and safely and smoothly starts cooling operation.

Means for Solving the Problems A temperature control device of the present invention for solving the above problems includes a first temperature detector that detects the temperature of a compressor and the like and an evaporator of a refrigerator or the like that constitutes a refrigeration cycle; a second temperature detector that detects the temperature inside a refrigerator or the like; a delay timer that starts integration as soon as the power is turned on and generates a delay signal for a certain period of time;
logic determination means for inputting the temperature signal of the first temperature detector and the delay signal of the delay timer when the power is turned on and outputting a timer signal; and the temperature signal of the second temperature detector and the logic determination means. The control means receives the output of the means as an input and outputs a control signal to the compressor.

Effects According to the present invention, with the above-described configuration, the stop time of the compressor is determined by detecting the temperature of the evaporator when the power is turned on, and when there is no need to delay the start of the compressor, the cooling operation is immediately started. I can do it.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are a block diagram and an operation flowchart, respectively, of an embodiment of the temperature control device of the present invention.

8 is a first temperature detector which detects the temperature of the evaporator of the refrigerator and outputs a temperature signal _S7 . 9 is a first voltage conversion means, which converts the temperature signal of the first temperature detector 8;
It inputs _S7 and outputs voltage signal _S8 . 10 is the first
The reference voltage generating means outputs a reference voltage signal _S9 . Reference numeral 11 denotes a first comparing means which inputs the voltage signal S ₈ of the first voltage converting means 9 and the reference voltage signal S ₉ of the first reference voltage generating means 10 and generates a judgment signal.
Output S ₁₀ . 12 is a delay timer and a delay signal S ₁₁
Output. Reference numeral 13 denotes logic judgment means that outputs the judgment signal S10 of the first comparison means ₁₁ and the delay timer 12.
It inputs the delayed signal _S11 and outputs the timer signal _S12 . A second temperature detector 14 detects the temperature inside the refrigerator and outputs a temperature signal _S13 . Reference numeral 15 denotes a second voltage conversion means which receives the temperature signal _S13 from the second temperature detector 14 and outputs a voltage signal _S14 . 16
is the second reference voltage generating means, which generates the reference voltage signal S ₁₅
Output. Reference numeral 17 denotes a second comparing means which inputs the voltage signal S14 of the second voltage converting means ₁₅ and the reference voltage signal S15 of the second reference voltage generating means ₁₆ and outputs a determination signal _S16 . Reference numeral 18 denotes a control means which inputs the timer signal S ₁₂ of the logic judgment means 13 and the judgment signal S ₁₆ of the second comparison means 17;
It outputs a control signal _S17 for controlling the compressor No.9.

An embodiment of the temperature control device of the present invention constructed as described above will be explained using the operation flowchart of FIG. 2.

First, when the power is turned on to the temperature control device of the present invention, the delay timer 12 starts integration in step a and outputs a fixed time delay signal _S11 . Next, in step b, the first temperature detector 8 detects the temperature of the evaporator when the power is turned on and outputs a temperature signal _S7 . Next, in step c, the first voltage conversion means 9 inputs the temperature signal _S7 of the first temperature detector 8, converts it into a voltage signal _S8, and outputs it. Next, in step d, the first reference voltage generating means 10 outputs the reference voltage signal _S9 . Next, in step e, the voltage signal S ₈ of the first voltage converting means 9 and the reference voltage signal S ₉ of the first reference voltage generating means 10 are input to the first comparison means 11, and the judgment signal S ₁₀ is generated. Output. The judgment signal S ₁₀ at this time is (3)
When the equation (4) is satisfied, the judgment signal S ₁₀ ' means that the temperature detected in step b is high, and when the equation (4) is satisfied, the judgment signal S ₁₀ '' means that the temperature detected in step b is low. Output.

S ₈ ≧S ₉ ...(3) S ₈ <S ₉ ...(4) Next, in step f, when the logic judgment means 13 inputs the judgment signal S ₁₀ ' of the first comparison means 11, it outputs a delayed signal. When inputting the timer signal S ₁₂ ′, which means that S ₁₁ is turned off, and the judgment signal S ₁₀ ″, a timer signal S ₁₂ ″, which means that the delay signal S ₁₁ is turned on, is output.

Next, in step g, the second temperature detector 14 detects the temperature inside the refrigerator and outputs a temperature signal _S13 . Next, in step h, the second voltage conversion means converts the temperature signal _S13 from the second temperature detector 14 into a voltage signal _S14 proportional to the temperature and outputs it. Next, in step i, the second reference voltage generating means 16 outputs a reference voltage signal _S15 indicating the temperature at which the temperature inside the refrigerator is high enough to turn on the compressor 19. Next, in step j, the second comparing means 17 compares the voltage signal of the second voltage converting means 15.
_S14 and the reference voltage signal _S15 of the second reference voltage generating means 16 are inputted, and a determination signal _S16 is output. At this time, the judgment signal S ₁₆ is a judgment signal S 16 ′ which means that the temperature detected in step g is high when formula (5) is satisfied, and a judgment signal S ₁₆ ′ which means that the temperature detected in step g is high when formula (6) is satisfied. is output as a judgment signal S ₁₆ ″, which means that the value is low.

S ₁₄ ≧S ₁₅ ...(5) S ₁₄ <S ₁₅ ...(6) Next, in step k, the control means 18 compares the timer signal S _{12 of the logic judgment means 13} with the judgment signal S 16 of the second comparison means _17. is input, and if the timer signal _S12 ' is input, proceed to step l, and the timer signal S12' is input.
When S ₁₂ '' is input, the process proceeds to step m. Next, in step m, the control means 18 outputs the judgment signal S ₁₆ ', S _{16 '} ' from the second comparison means 17.
When the signal is S ₁₆ ', the process advances to step n, and when the determination signal is S ₁₆ '', the process advances to step l.

Next, in step l, the control means 18 outputs a control signal _S17 ' to stop the operation of the compressor 19, and in step g
Return to and repeat the action. In step n, the control means 18 outputs a control signal S ₁₇ '' for operating the compressor 19, and the process returns to step g to repeat the operation.

In this embodiment, the first voltage conversion means 9 and the second voltage conversion means 15 output the voltage signal S 8 and the voltage signal S 14 in proportion to the temperature, but they output the voltage signal S ₈ and the voltage signal S ₁₄ in proportion to the temperature. It is also conceivable that a voltage conversion means for comparison is used, and in this case, the comparison will be made using logic with the inequality signs in equations (3) to (6) reversed.

As described above, according to this embodiment, the first temperature detector 8 detects the temperature of the evaporator, and the temperature detector 8
a first voltage conversion means 9 that converts the temperature signal S ₇ of the voltage into a voltage; a first reference voltage generation means ₁₀ that outputs the reference voltage signal S ₉ ; A first comparison means 11 receives the reference voltage signal S ₉ of the first reference voltage generation means 10 and determines the temperature, and the judgment signal S ₁₀ of the first comparison means 11 and the delay signal S 11 of the delay timer 12 _are input. By providing a logical determination means 13 which receives as an input and outputs a timer signal _S12 in accordance with a determination signal _S10 , when the temperature of the evaporator when the power is turned on is higher than a certain temperature, the compressor 19
It is possible to prevent a start delay when the power is turned on even if the system has been stopped for a sufficiently long time, and to immediately perform a cooling operation according to the temperature inside the refrigerator, thereby ensuring cooling performance.

Effects of the Invention As described above, the present invention includes a first temperature detector that detects the temperature of the evaporator of a refrigerator, etc., in which a compressor or the like constitutes a refrigeration cycle, and a second temperature detector that detects the temperature inside the refrigerator, etc. a temperature detector, a delay timer that starts integration as soon as the power is turned on and generates a fixed time delay signal, a temperature signal of the first temperature detector when the power is turned on, and a delay signal of the delay timer. and a logic determination means for outputting a timer signal, and a control means for inputting the temperature signal of the second temperature detector and the output of the logic determination means and outputting a control signal to the compressor. The system detects the stop time of the compressor before turning on the power based on the temperature of the evaporator, controls the delayed operation of the compressor when the power is turned on, protects the compressor, and when delayed operation is not required. , the compressor can be started immediately, cooling operation can be started smoothly, and the cooling of the food inside can be prevented from slowing down.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the temperature control device of the present invention, Fig. 2 is a flowchart of the operation shown in Fig. 1, Fig. 3 is a block diagram of a conventional temperature control device, and Fig. 4 is Fig. 3 of the same. This is a flowchart. 8...First temperature detector, 12...Delay timer, 13...Logic determination means, 14...Second temperature detector, 18...Control means, 19...Compressor.

Claims (1)

[Claims] 1. A first temperature detector that detects the temperature of an evaporator such as a refrigerator that constitutes a refrigeration cycle with a compressor etc.;
a second temperature detector that detects the temperature inside a refrigerator or the like; a delay timer that starts integration as soon as the power is turned on and generates a fixed time delay signal; and the first temperature detector when the power is turned on. logic determination means that receives a temperature signal from the second temperature detector and a delay signal from the delay timer and outputs a timer signal; and a logic determination means that receives a temperature signal from the second temperature detector and an output from the logic determination means and controls the compressor. A temperature control device comprising a control means for outputting a signal.