JPS588974A - Method of displaying temperature of refrigerator, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature display method for a refrigerator, etc., which displays the internal temperature of a cooler such as a refrigerator after defrosting is completed, and also operates a defrost notification means for a predetermined period of time.

Conventionally, in a temperature display method that includes both a display means for displaying the internal temperature of a refrigerator or the like numerically on a display tube, and a notification means for lighting up a diode to notify when the lI is taken, the lJ l11 by recording/notifying means
It was used to notify abnormalities in the temperature inside the refrigerator when 1L was reached, and abnormalities in the temperature inside the refrigerator due to malfunctions of the compressor, steamer air blower, etc. other than during defrosting.

On the other hand, even if defrosting is completed and cooling operation is restarted,
The temperature inside the refrigerator, which rose during emptying, does not immediately drop to the set temperature, and if the display means is operated for a predetermined period of time after 1/2 liter removal is completed, or the 0 display means that was inactive is activated, a high temperature display will indicate the end of lees removal. It is not possible to clearly determine whether the temperature is due to an accompanying temperature or a failure of the moth equipment, and if it is not working, it is impossible to confirm the temperature inside the refrigerator.

The present invention improves the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to the drawings.

(1) is a temperature sensor, such as a transistor, whose collector and base are connected to the output terminal and (-) input terminal of the operational amplifier @tg+ to detect the internal temperature of a refrigerator, etc., and when the temperature of the sensor increases. When the temperature of the sensor decreases, its impedance decreases, and when the temperature of the sensor decreases, its impedance increases. (31 is a resistor connected between the connection point between the base of the temperature sensor (1) and the (-) input terminals of the operational amplifier (2) and the power supply terminal (mu). Determine the reference current. (4) is an operational amplifier connected between the power supply terminals (A) and (211) and supplied with power supply voltage v6 from the power supply terminal (III). The input terminal is an operational amplifier (2)
It is connected to the output terminal of the operational amplifier (21) via an adjustment resistor (51) and a resistor (6) connected between the output terminal and the power supply terminal (Al).The adjustment resistor (5) is When temperature sensor (11 is 0℃)
It is a resistor for making the
This is an adjustment resistor connected to the negative feedback circuit between the output terminal of 1 and the (-) input terminals, and it matches the temperature of the temperature sensor (1), which is sluggish in high temperatures, with the temperature displayed on the display section, which will be described later. and determine the temperature characteristics of the temperature sensor (1).

(8) is the Muha transformation a that converts the analog signal into a digital signal, (9), Q (1 is the Muha transformation aυ that converts the digital signal
This is a decoder driver with a chip that converts the code into a numerical display and outputs it. When a low level signal (hereinafter referred to as the "lower signal") is applied to the terminal aL (13) of the decoder driver 19) and 06 with a latch, the output disappears, and when a high level signal (hereinafter referred to as the "H signal") is applied, the output is output. has a 4-digit fluorescent display tube with 7 segments arranged in a roughly figure-8 shape in each digit as a display means to display the temperature inside the car.For example, the temperature is displayed using two digits on the right and one digit on the other (-). (minus sign), and has a lighting lB114 as a notification means to notify defrosting of the cooler, and is supplied with power from the secondary side of the transformer 4 and the power terminal (II).The A/ml converter (8) is The latch decoder driver (9) is connected to the display layer via ae.

The resistor 1, the fin is connected between the (+1 side input terminal of the operational amplifier 1m) and (4) and the reference voltage terminal - of the Mu/!I converter (8). The adjusting resistance axis that determines the resistance (2) and the resistor (2) are connected in series between the power supply terminal ((m).

01 is lN8I constant contact (to), (to) and movable contact (to)
The fixed contact (to) is connected to the output terminal of the operational amplifier (4), and the li! The fixed contact (2) is between the adjusting resistor al and the resistor -, and the movable contact (2) is between the A/f
It is connected to the input terminal (to) of the fi converter (8),
Possible - When the contact piece (goods) is closed to the fixed contact a, the display section all
Displays the temperature inside the refrigerator, and when closed to the constant contact point I displays the set concentration inside the refrigerator.

(to) is a switch circuit for temperature l1lIIa. (goods) is the operational amplifier l, and (+) the personal cursor is the resistance (to)
The (-) input terminals are connected to the output terminal of the operational amplifier (4) via the adjusting resistor ti9 and between the resistor @. A positive feedback resistor (2) is connected between the output terminal of the ffl amplification sam and the ←) input terminal, and the output terminal is connected to the power supply via the series-connected resistor (11). (terminal body). The base of the ap*g transistor (to) is connected between the resistor (to) and the resistor G1), the collector is connected to the excitation winding (to) of the electromagnetic switch (to), and the emitter is connected to the power supply terminal (AI). (to) is an electromagnetic switch □□
□ is the fixed contact, Oe is the movable contact, and the refrigeration equipment (b)
is interposed in the compressor operating circuit.

− is a Tatsuo timer element for displaying rice cake, which is shown as an example;
@ is a photocoupler consisting of light emitting diode 4 and phototransistor I. The timer element (to) is connected to the voltage source (Bl), is supplied with the power supply voltage, and is connected to the output terminal -
is connected to the display section (In's defrosting light I).The time constant circuit of the resistor and capacitor connected to the timer element is connected to the timer element (to).
This is used to determine the II period, and the resistor is used to stabilize oscillation.

Terminal - is a count and number switching terminal for the timer element (to), and is connected between the resistor and capacitor connected in series between terminals IA) and (!l). The other end of the capacitor is connected to the terminal of the timer element, and a diode is provided in parallel to the resistor.

The actual ivy of the phototransistor ha is connected to the input terminal of the timer element (50) and the inverter (51), and the collector is connected to the voltage terminal (leg), and when the 1 light emitting diode ■ is lit, The inverter (51) is connected to the power terminal (A
), (1B1, and the power supply voltage MAC is supplied from the power supply terminal (1). Also, the output terminal of the inverter (51) is connected to the latch decoder driver (91, fi (It
When the signal from the phototransistor ha is above a predetermined value, an L signal is output, and when it is less than a predetermined value, an iris signal is output to the latch decoder driver (S), α. The input terminal of the inverter (51) and the power supply terminal μ
) is provided with a resistor (52) to stabilize the operation of the inverter (51). (55) is a defrosting circuit. Contact (54) Diode (55)
A series circuit of resistors C56) and (57χ light emitting diodes is connected between the power supply terminals C1 and (DI), and a contact (58) and a heating heater (59) are connected in parallel to the series circuit.
A series circuit is provided with.

Connect a condenser in parallel to the series circuit of the resistor (57) and the light emitting diode? (60) is provided. Contact (54
Both the on (5th day) are controlled by the defrost output of the defrost timer device (61).

The operation of one embodiment of the temperature display method will be described below with reference to the drawings. When the temperature of the S meter (1) decreases due to a decrease in the temperature inside the refrigerator during a cooling operation in a refrigeration cycle such as a refrigeration rate, the impedance of the temperature sensor port (temperature sensor port) increases. Accordingly, the H inputs of the operational amplifier (2) decrease and the output voltage increases. Operational amplification 1111! From I to adjustment resistor (5
) and the resistor (6), the output voltage of the operational amplifier (4) decreases due to the rise in the (-) inputs of the operational amplifier (4). When the movable contact (to) of the changeover switch ■ is closed to the fixed contact (to), the output of the operational amplifier (4) undergoes Mu/D conversion! It is applied to the input terminal of I (81), and the analog signal is converted to a digital signal.

The output of Dfl141 (8) is a decoder driver with a latch (91, (1 (indicated by I) It is replaced with an output that can be displayed numerically by IBaTJ, and it is sent to the display S, and the decreased internal temperature is displayed numerically. Here, when the movable contact piece of the changeover switch QrJ is closed to the fixed contact 123,
The display section αυ displays the set temperature inside the refrigerator. Also, the output of the operational amplifier (4) becomes the (g) input of the operational amplifier (t) via the resistor (to).

The voltage divided by adjustment resistor a and resistor ■ is (-)
Individual input. Here, as the temperature inside the refrigerator decreases, the calculation is amplified!
When the output voltage of 1(4) decreases, the change in the output voltage becomes a change in the (g) inputs of the operational amplifier IIvI via the resistor (to). Furthermore, the output voltage of the operational amplifier (4) decreases,
When the voltage drops to the voltage set by the resistor (wcQ) and the resistor (2), the output voltage of the operational amplifier scm decreases due to the positive feedback action of the resistor (to), and the transistor (to) (jj, l1l) becomes non-conductive. , electromagnetic opening/closing I11aIm movable contact piece (
(To) will open, and the refrigeration equipment will cease operation.

On the other hand, during cooling operation, the contacts (54) and (59) are closed by the defrost output of the defrost timer device (61).
When the 111L heating heater (59) is energized and boxing operation is started, voltage is simultaneously applied to the light emitting diode of the 7 Oto coupler (to), the light emitting diode decoy lights up, and the phototransistor (A1) becomes conductive. , the reset terminal ω of the delay timer element (to) for displaying WI is supplied with a power supply voltage 0 from 1, and the terminal (connection) outputs the electrical voltage MC, and the 1 display part aυ lights up. Enter Iku αno 1
Lights up! Ia- lights up and defrost notification is performed.

At the same time, a signal of a predetermined value or higher is added to the inverter (51), and the output of the inverter (51) becomes a hand signal to the latch decoder driver 191. Q (terminal 1z of I
.

@S is given a mu signal and a decoder driver with a switch (
The output to 914111 disappears, and the temperature display on display section 1 disappears. Time has passed and the timer device (61
Due to the time-up operation of the switch, the contact point (54 people (58)) is opened, and when the ll operation is completed, the light emitting diode turns off, the phototransistor CD becomes non-conducting, and the input of the inverter (51) is the M signal, and the output is the H signal. Therefore, the decoder driver with latch (9).

The ■ signal is applied to terminals αa and aS of a, the decoder driver (9) and the spear output, 1 display ISIm displays the temperature, and at the same time the input to the reset terminal - of the timer element (to) disappears. The timer element (to) starts the timer operation, and waits until the temperature inside the refrigerator drops to the normal temperature after the II operation is completed. For example, 1
If the terminal operates for 5 minutes, the power supply voltage will be output.

Display section II displays the temperature and lights S*- to continuously notify defrost, and also indicates when the temperature inside the refrigerator has risen due to an obvious failure of the compression monitor or the evaporator fan motor during cooling operation. Since no lighting signal is inputted to the display section I, no notification is made for 1iIIL, and only a high temperature display is made. Therefore, it is possible to accurately distinguish between a high temperature display that continues for a predetermined period of time when the cooling operation is restarted after the lightning strike operation has ended, and a high temperature display that occurs due to an abnormality, such as a failure in the compressor's refrigeration cycle or a failure in the evaporator fan motor. can.

When the power is turned on, the voltage applied to the terminal of the timer element is kept low by the charging circuit of the resistor to speed up the counting of the timer element.
7 is prevented if the defrost notification at power-on, which is caused by the circuit configuration of the timer element (to), operates for a predetermined period of time.

The above embodiment will be explained using the lighting part a- provided on the display 111m as a notification means to display the defrosting of the cooler during defrosting and to operate continuously for a predetermined time when the cooling operation is resumed after the completion of defrosting. However, similar effects can be obtained by using other notification means such as a buzzer.

As described above, the Honkamei is equipped with a display means for displaying the internal temperature of a refrigerator, etc., and a notification means for notifying the unpacking of the cooler. When the cooling operation is restarted after defrosting is completed, the display means is activated and the notification means continues to operate for a predetermined period of time. For example compressor,
Accurately judge high temperature indications due to failure of evaporator fan motor, etc.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram of an embodiment of the temperature display method according to the present invention. In the figure, (1) is the temperature sensor, (2), (41, (foundation) is the operational amplifier. (8) is the A/l) converter, 19+, (1G is the f coder driver with latch, and the key υ is the display. Department, @ is NP) 11n
transistor. (to) is an electromagnetic switch, @ is a refrigeration device, @ is a delay timer element for defrosting display, @ is a photocoupler, (!11
) is the inverter, (585) is the defrost circuit, (6
1) is a titer device for defrosting.

Claims (1)

[Claims] 1II, comprising a display means for displaying the internal temperature of a refrigerator or the like, and a notification means for informing that the cooler is in a frost layer;
Temperature display for a refrigerator, etc., characterized in that when the IIL is removed, a notification means is activated and the display means is inactivated, and when cooling operation resumes after the II is removed, the display means is activated and the notification means is continuously operated for a predetermined period of time. Method.