JPS61102928A - Temperature controller of warm air drying apparatus - 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 [Field of Application of the Invention] The present invention relates to an improvement of a temperature control device in a hot air drying device.

[Technical background of the invention]

In recent years, private parts washing devices have been installed in toilet bowls, which are equipped with a washing means that sprays washing water at an appropriate temperature and a drying means that uses warm air to dry the private parts that have been washed with the washing water.
Toilet bowls with private parts cleaning devices have come into use, which allow for hygienic post-treatment by cleaning and drying private parts without having to touch one's hands.

As a cleaning means for this type of device, for example, a solenoid valve is installed between the water supply source and a nozzle for jetting cleansing water placed in the toilet bowl, and a heating device is installed in which a heater and a temperature sensor are housed in the case. The heater is connected to a power source via a switching element, and the cleaning water flowing into the heating device is instantly heated to a set temperature (approximately 38 ℃).
°C), and the cleaning water is spouted from the nozzle by controlling the energization of the switching element based on the difference between the detection signal of the temperature sensor that detects the temperature of the heated cleaning water and the reference signal of the set temperature. There is an instant heating method that controls the temperature to keep it constant.

In addition, as a drying means, near the nozzle for jetting cleaning water,
A fan connected to an electric motor, a heater that heats the air blown by the fan, and a temperature sensor for detecting the temperature of the hot air are housed and arranged in a case that has an air outlet that blows hot air toward a local area. An electric motor is connected to the power source, and a heater is connected via a switching element to heat the air blown by the fan and send out warm air from the outlet, and the temperature sensor's detection signal and standard settings are set. The heater is configured to send out hot air by controlling the energization of the heater by comparing the temperature with a reference signal (approximately 45° C.).

[Problems with background technology]

However, in the private parts washing device, the temperature control of the washing water is controlled to always maintain the set temperature because it cleans sensitive private parts. The hot air needed to dry the private parts of the body is only needed to dry the private parts, so the heater is simply turned on and off when the temperature reaches around the standard temperature. For this reason, when the 1ri wind drying device is started after washing the private parts, as shown in Figure 7,
The temperature of the warm air overshoots before it stabilizes at the target temperature, and as a result, immediately after drying begins, the user feels hot in the vicinity of their private parts, which may cause discomfort to the user.

The overshoot of this hot air temperature is +3 T'fA
It is about 15°C higher than the temperature, and the time is about 1 to 2 seconds.

The causes of this overshoot are that it takes time for the blower electric motor to rotate at a constant speed after starting up, and that the temperature detection time is delayed due to the thermal response time of the temperature sensor for detecting the temperature of the hot air. Possible causes include temperature rise due to residual heat from the heater.

Therefore, immediately after starting the hot air drying device, the heater is fully energized and rapidly heats the air around it, and this heated air is controlled by a temperature sensor such as a thermistor whose resistance changes greatly depending on the temperature. Before the temperature is detected, a slight breeze generated by the fan driven and rotated by the blower electric motor, which has not yet reached stable rotation, is blown near the local area, so it is inevitable that the hot air dryer will
Warm air with a temperature slightly higher than the target temperature will be blown out for a while. For this reason, for example, a system has been developed in which multiple heaters are installed and the energization capacity of the heaters is varied using a changeover switch to heat the air and obtain hot air, but it is not possible to finely adjust the temperature of the hot air. Therefore, it is insufficient to provide the drying effect of warm air that is comfortable for the user l), and
This has the drawback of forcing the user to perform complicated switch operations.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, and sets the first set temperature of hot air to be lower than a standard temperature suitable for drying (hereinafter referred to as target temperature) when the heater of the hot air drying device starts energizing. When the temperature of the hot air reaches the first set temperature, the heater is turned off, and when the heater is turned on again, the temperature of the hot air is increased from the first set temperature at the start of energization to the target temperature. By maintaining the temperature, the gap between the detected temperature and the target temperature due to the response delay of the temperature sensor is minimized, and the overshoot of the hot air temperature during the initial energization of the heater caused by the response delay of the temperature sensor is prevented. The present invention provides a temperature control device for a hot air drying device.

[Summary of the Invention] The present invention provides a method for controlling heating when the temperature of the hot air reaches a first set temperature that is slightly lower than the target temperature (in this case, when the heater starts energizing,
In other words, immediately after the heater is energized, the sensor itself has not been warmed up, so there is a delay in response, and the temperature actually detected by the temperature sensor is lower than the target temperature (approximately The temperature of the hot air is around 45°C. ), the power to the heater is temporarily stopped.

(At this time, the first set temperature is set at approximately 37°C. In other words, when determining the first set temperature, the temperature of the hot air does not exceed the target temperature due to overshoot that occurs when the heater starts energizing.) ), then,
Start energizing the heater again and raise the temperature of the hot air to the target temperature (at this point, the temperature sensor is heated, so there is almost no response delay, and the temperature of the hot air can be inspected almost accurately. ) and controls the heater's energization to maintain that temperature, thereby sending out warm air at an appropriate temperature that does not cause discomfort to the user of the hot air drying device. shall be.

[Embodiments of the invention]

An example in which the present invention is implemented in a hot air drying device attached to a private parts cleaning device will be described below with reference to FIGS. 1 to 6.

In Figures 4 and 5, 1 is a toilet seat with a lid attached to the toilet bowl 2, and a horizontally long box 3 is attached to the back of the toilet seat 2. Inside this box 3 is a water supply pipe connected to a water supply source (not shown). 4 to a position suitable for squirting cleansing water toward the private parts via the solenoid valve 5, a nozzle (v6) is attached to the tip of the water supply pipe 4, and a A cleaning water heating device 9 containing a hollow ceramic heater 8 housed in a cylindrical case 7 is connected via piping, and the cleaning water flowing through the heating device 9 is instantaneously set by the heater 8. A cleaning device A case 10 has a blower outlet for blowing warm air toward a local area near the case 10, a blower 11 has a fan connected to the case 10, a heater 12 for heating the air stretched in front of the blower 11, and a case 10 in the vicinity of the blower outlet. Temperature sensor 13 attached to
and a warm air drying device Y containing the same. Further, an insulated heater H for heating is provided on the back surface of the toilet seat 1, and a toilet lid 14 is further provided on the top surface of the toilet seat 1 to close the top surface of the toilet seat 1 when the toilet bowl 2 is not in use. It is pivoted so that it can be opened and closed. A toilet seat 1 is provided in the box body 3.
A control box 3 (incorporated) is formed to extend on the side of the control box 3, and on the top surface of the control box 3, push buttons of push button switches 81 to S3 are displayed, for example, "wash", "dry", and "toilet seat". In addition, in the control box 3, a control device for a cleaning device X, which is not shown in this embodiment, and a control device 15 for a hot air drying device Y, which will be described later, are housed and installed. The power source for the solenoid valve 5, heating device 9, and hot air drying device Y1 is connected to a commercial AC power source via a connecting terminal (plug) 16t attached to the end of a cord led out from the box body 3. (For example, AClooV) 17.

Next, the control device 15 of the hot air drying device Y will be explained.

18 is a power supply circuit connected to the connection terminal 16; 19 is a resistance-voltage conversion circuit connected to the temperature sensor 13 and converts the change in resistance value detected by the temperature sensor 13 into a voltage; and 20 is a temperature Standard target temperature of wind (approximately 45°C)
A reference value setting circuit that sets an output corresponding to the voltage in terms of voltage, 21
is a comparative soft circuit incorporating a comparator CP1 with an open collector output, and a resistor - is connected to the inverting input terminal of the comparator CPI.
The output Vt from the voltage conversion circuit 19 is input, the output VIE from the reference value setting circuit 20 is input to the non-inverting input terminal, and when these two inputs are compared, vta vao is obtained.
The open collector output transistor is turned on and current flows from the output terminal of the comparator CPi into its interior, and conversely,
When vt (vay), the open collector output transistor is turned off and a V level μ signal is output from the output terminal of the comparator CPU. 22 has clear and preset inputs. The flip-flop circuit includes a TK flip-flop F1, and its input terminal is connected to the output terminal of the comparator circuit 21. 23 is a set temperature switching circuit connected between the output terminal of the JK flip-flop FF and the non-inverting input terminal of the comparator CPl. When the output from the TSUDE FF is input, the non-inverting input terminal of the comparator OP1 receives a voltage slightly lower than the voltage corresponding to the target temperature output from the reference value setting circuit 20, that is, lower than the target temperature. The first set temperature (approximately 37℃
) is input. 24 is a zero-cross detection circuit that receives the output of the full-wave rectified waveform from the power supply circuit 18 and sends out a pulse signal at the zero point of the input waveform; 25 is a gate drive connected to each output terminal of the comparator circuit 21 and the zero-cross detection circuit 24; In the circuit, when the push-button switch S2, which is a drying switch, is turned on, the pulse signal output from the gate drive circuit 25 zero-cross detection circuit 24 and the constant voltage 1iiVccI supplied from the power supply circuit 18 cause a switching element ThK such as a triac, and a gate. Send a signal. 26 is a drying instruction circuit connected to the push button switch S2.

Next, the specific circuit configuration of the control device 15 will be explained in more detail with reference to FIG.

The power supply circuit 18 includes a power transformer Tr connected to the connection terminal 16, a diode bridge DB having an AC input terminal connected to the secondary side of the transformer Tr, and a diode D inserted in series with the DC output terminal of the diode bridge DB.
and a voltage regulator AVR, and the diode glitch D.
A smoothing capacitor C is inserted in parallel with the DC output terminal of B, and a constant voltage power supply Vcc is supplied as an operating power supply to each of the circuits described above after lowering the voltage of the commercial power supply and full-wave rectification. The resistance-voltage conversion circuit 19 is connected between the constant voltage power supply Vcc and the ground.
A resistor R1 and a temperature sensor 13 are inserted in series, and a contact point T1:Ie between these resistors R1 and the temperature sensor 13 is set as an output terminal, and from this output terminal, the temperature of the hot air detected by the temperature sensor 13 is adjusted. Output V divided by resistance value and resistor R1
t force; sent out. The reference value setting circuit 20 is connected to a constant voltage power supply V.
A resistor R2 and a variable resistor VR are inserted in series between cc and ground, and the connection end between these resistors R2 and variable resistor VR is the output terminal, and from this output terminal, the standard target temperature (approximately An output corresponding to 45°C) is set by voltage. The comparison circuit 21 connects the output terminal of the resistance-voltage conversion circuit 19 to the inverting input terminal of the open collector output comparator CPI, and connects the output terminal of the reference value setting circuit 20 to the non-inverting input terminal of the comparator CP1. , the output terminal of the comparator CPI is connected to a constant voltage power supply 'V through a resistor R3.
Connected to cc. Then, when the input of the comparator CPI is V'K vS, the signal of π level from the output terminal is v
When t2 ■E/), t lebel force is applied. The flip-flop circuit 22 connects the J and PC input terminals of the JK7 flip-flop FF to the constant voltage power supply Vcc, the OK input terminal is connected to the output terminal of the comparator CPI, and a relay x1 is connected between the constant voltage power supply Vcc and the ground. Normally open contact
A capacitor C1 and a resistor R5 are inserted in series, and a capacitor ■ [ is connected to the OL input terminal of the TK flip-flop FF, and a diode DI cathode whose anode is connected to the OL input terminal is connected to a constant voltage power supply. Connect to Vca. The output terminal Q of the JK flip-flop FF is connected to the input terminal of a set temperature switching circuit 23, which will be described later, and the other output terminal Q is connected to the JK flip-flop FF.
configured by connecting to the PR input terminal, and the JK
In the flip-flop FF, if a π-level signal is always input to the input terminal of J, the output terminals Q and Q will change to the previous state (for example, from Q to ? level, from Q to π Suppose that a level signal is outputted) is inverted from B (a π level signal is output from Q, and a π level signal is output from Q). However, the input to the PR input terminal! level signal, even if input is applied to the OK input terminal, the output terminal Q. The output signal from Q does not change and Q
From π level, from Q! level signals are output respectively, and when a π level signal is input to the OL input terminal, even if an input is applied to the OK input terminal, the output signals from the output terminals Q and Q do not change. , Q to Froebel, Q
A signal at the π level is output.

Further, when the inputs to the PR input terminal and the CL input terminal are both π level signals, the OL input terminal is given priority and output from Q to t level. The set temperature switching circuit 23 includes a common emitter transistor Q1, a resistor R6 inserted between the collector of this transistor Q1 and the non-inverting input terminal of the comparator CP1,
It consists of a resistor R7 inserted between the output terminal Q of the flip-flop FF and a resistor R8 inserted between the base of the transistor and ground. The transistor Q1 outputs #E! from the output terminal Q of the JK flip-flop FF! (by turning on the transistor R), the resistor Re is connected to the resistor 12.
d! As a result, the output from the reference value setting circuit 20 drops because the resistor R6 is inserted in parallel with the resistor 12, and this dropped output v from the comparator CPi is input to the non-inverting input terminal of

That is, when the Tofunjistor Q is turned on, a voltage corresponding to the first set temperature (approximately 37°C), which is slightly lower than the voltage corresponding to the target temperature, is input to the non-inverting input terminal of the comparator CP1. That will happen. The zero-cross detection circuit 24 includes a transistor lead with a common emitter, a diode D1 whose anode is connected to the V-ctor and a cathode connected to the output terminal of the comparator CPl, a transistor Q, and a wood cutter at the base of 217). A resistor 110 is inserted between the anode of this diode A' and the DC output terminal of the diode bridge DB, and a resistor R9 is inserted between the base of the transistor and ground. With the collector of the transistor Q2 as the output terminal,
Outputs a pulse signal synchronized with the zero point of AC. The gate drive circuit 25 includes a pair of light emitting diodes LEDI,
LED2 and light receiving element “PEI.

The base of the transistor Q3 is connected to the collector of the transistor of the zero-cross detection circuit 24 and the anode of the diode D1, and the collector of the transistor and the constant voltage power supply Vcc are connected to each other. Light emitting diodes LEDl and LED2 of the photocoupler PC are inserted in series between them via a resistor R11, while a switching element Tk)+
7) A photocoupler PC is installed between the gate and the first anode.
The light receiving elements PEI and PE2 are inserted in antiparallel through a resistor R12. Further, the emitters of the transistors Q and 3 are connected to the anode of a diode D4 whose cathode is connected to the push button switch S2. The first anode of the switching element TIYI is connected to the connection terminal 16 via the heater 12, and the 27th node is directly connected to the connection terminal 1.
6, and the blower 11 is in parallel with the switching element Tll. Connect to the connection terminal 16 via the normally open contact X2a of V-XI. The connection point with the switch S2 and the constant voltage power supply Vcc
Insert relay x1 in series between
A diode D5 is connected between the terminals of the push button switch S2 to start the blower 11 and to start energizing the heater 12.

The pushbutton switches 81 to 81 are configured to be closed when pressed for the first time, and are unclosed when pressed once again.

Next, the operation will be explained.

After the private part has been cleaned by the private part cleaning device, when the user presses the push button switch S2 labeled "Dry" on the top surface of the control box 3a at point tm in FIG. 3, the transistor Q3 of the gate drive circuit 25 is activated. Is it from comparator CPn? When a level signal is output and a pulse signal is sent from the zero cross detection circuit 24 to the base of the transistor Q3, it turns on, and the constant voltage power supply Vcf3 connects the resistor R11 → photocoupler PC → the collector-emitter of the transistor Q, 3. A current flows between → diode D4 → pushbutton switch S2 → ground, and the light emitting diode LEDL of the photocoupler PC.

LED 2 emits light, and the light receiving element PEI receives this light.

When PE2 is turned on, a gate current flows through the gate of the switching element TI'fl, turning on the switching element Th, and energization of the heater 12 is started. Said push button switch 8
By turning on, υ relay x1 is also energized and its normally open contact
a, close Xla.

By closing the normally open contact X2a, the blower 11 is also activated and starts blowing air at the same time as the heater 12 is energized. At this time, from the output terminal of the comparator CP1 of the comparison circuit 21, it is immediately after the heater 12 is energized, and furthermore, there is a delay in response of the sensor 13 due to the temperature, and due to the ■Kv■ relationship! A level signal is output (output of CP1 in FIG. 3).

This is because the comparator CPx is an open collector output comparator, and when the voltage is vKv, the open collector output transistor is turned off.

In addition, the flip-flop circuit 22 is activated by excitation of the relay x1.
The normally closed contact Xla inside is also closed. Due to the closing of normally open contact Xla, capacitor C1 becomes resistor R at constant voltage power supply Vcc.
It is charged via 5. At this time, capacitor C1 is not charged at the moment when normally open contact Xxa is closed, so JK
A constant voltage power supply V is connected to the OL input terminal of the flip-flop FF.
ac (a π level signal) is input. Further, as the capacitor C1 is charged by the constant voltage power supply Vcc, the potential between the connection point with the capacitor C etodiode D2 and the ground gradually drops to zero volts. At the moment when a π level signal is input to the OL input terminal of the JK flip-flop FF, a π level signal is output from its output terminal Q (output shown in FIG. 3 Q). Then, ? is output from the output terminal Q of the TK flip-flop FF? The level signal turns on transistor 4 of the set temperature switching circuit 23, so that the potential input to the non-inverting input terminal of the comparator CP1 drops because the resistor R6 is inserted in parallel with the resistor R2. That is, the potential of the first set temperature, which is slightly lower than the potential of the target temperature, is input to the non-inverting input terminal of the comparator CPI. In this way, when the push button switch 321 is turned on, the output Vs from the reference value setting circuit W&20 is temporarily lowered from the target temperature level to the first set temperature Vbell (input of CPI in Figure 3). .

In this way, at the initial stage of energizing the heater 12, the temperature of the hot air is controlled at the first set temperature. and,
The temperature of the hot air is determined by the temperature sensor 13 to the set temperature (approximately 37°
If detected at point C) (at this point, temperature sensor 1
3), an overshoot phenomenon has already occurred, and the temperature of the hot air has reached the target temperature (approximately 45°C) as shown in Figure 6.
), the input to the comparator CP1 of the comparator circuit 21 is in the relationship of Vtl Vs, so from the output terminal, the open collector output transistor is turned on, and the voltage from the constant voltage power supply Vaa is The current flowing through the resistor R3 and the resistor R4 flows into the comparator CPI and the gate drive circuit 25
Since no base current flows through the transistor Q, the transistor Q is turned off. When the transistor 1 is turned off, the switching element Th is also turned off, and the current supply to the heater 12 is temporarily stopped. By stopping the power supply to the heater 12, the temperature of the hot air drops once, and the input to the comparator CPI becomes v-Kv.
■When the relationship returns, a π level signal is output again from the output terminal. (Output of CPI at point tm in FIG. 3) Therefore, the transistor Q3a of the gate drive circuit 25 is turned on by the current synchronized with the zero cross supplied again (output of CPI at point t in FIG. 3),
A gate signal flows to the gate of the switching element Th7), turning on the switching element Tht, and turning on the heater 12' again.
energize. Furthermore, when a π level signal is input again to the OK input terminal of the JK flip-flop FF after a π level signal is output from the output terminal of the comparator CPI,
The signals output from the output terminals Q and Q of the K flip-flop FF are inverted, and the output terminal Q outputs a 1-level signal, and the output terminal Q outputs a π-level signal. Then, the transistor of the set temperature switching circuit 23 is turned off by the π level signal outputted from the output terminal of the JK flip-flop FF. Therefore, the resistor R6 is no longer inserted in parallel with the resistor R2, so the potential at the output terminal of the reference value setting circuit 20 rises from the potential of the first set temperature to the potential of the target temperature (see Fig. 3). CPI at the tn point of
When the potential input to is in the relationship V"K VBtf), a π level signal is continuously output from the output terminal, and at this time, the first drive circuit 25 operates and the heater 12
When the current is turned on and the temperature of the hot air reaches the target temperature, a signal at the high level is output from the output terminal of the comparator CPI because the inputs are in a vqVsQ relationship, so no current flows through the gate drive circuit 25. Therefore, the power supply to the heater 12 is stopped. By repeating such a state, the temperature of the hot air is maintained at the target temperature and is sent out. Also, at this point, the temperature sensor 13 itself is heated by the hot air and the response lag is eliminated, so no overshoot phenomenon occurs and the temperature of the hot air is maintained at the target temperature, as shown in Figure 6. Ru. At this time, since the output terminal Q of the JK flip-flop FF is connected to the PR input terminal, a π level signal is output from the output terminal Q, so that the OK input terminal
Even if the π level or π level signal output from the comparator CPI is input, the outputs of the output terminals Q and Q will not change.

Therefore, once the set value of the warm air temperature is switched from the first set temperature at the start of energization of the heater 12 to the target temperature, it will not be switched to the first "set temperature" again.

That is, in order to change the outputs of the output terminals Q and Q of the JK flip-flop FF, an input signal must be applied to the CL input terminal. This means that when the push-button switch S2 is turned off to stop sending out hot air, and then starts sending out hot air again, the OL input terminal of the JK flip-flop FF? By inputting the level signal, the set value of the hot air temperature can be switched from the target temperature to the first set temperature.

〔Effect of the invention〕

As explained above, the present invention is configured to raise the temperature of the hot air to the target temperature and maintain that temperature, although the heater is fully energized when the heater starts energizing. The present invention has the following effects.

(1) When the heater is initially energized, an overshoot phenomenon occurs (due to the delayed response of the temperature sensor), but when the temperature of the hot air at this point reaches around the target temperature, the energization to the -1 heater is automatically turned off. This prevents the user from feeling uncomfortable at all due to hot air blowing out at a temperature higher than the target temperature.

(2) It takes almost no time to turn off the power to the heater and then turn it on again, so cold air is not blown onto the user when the heater is turned off, making effective use of residual heat from the heater. There is also an advantage that it can be done.

(3) Heater energization control is performed at a stage when the hot air temperature is low (
At this point, the temperature of the hot air has reached around the target temperature due to heater overshoot. ), and then at the target temperature, the temperature sensor has a delay in response to the hot air temperature by the time the heater is energized at the target temperature. Since this has been solved, the problem caused by the delayed response of the temperature sensor when the heater is energized can be solved, and hot air at an appropriate temperature can always be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device showing an embodiment of the present invention;
FIG. 2 is a partially cutaway plan view and side view of a toilet bowl with a private parts cleaning device embodying the control device of the present invention;
FIG. 6 is a temperature characteristic diagram of hot air produced by this device, and FIG. 7 is a custom-made temperature diagram of hot air produced by a conventional device. 12・Heater 13・Temperature sensor 19・Resistance-voltage conversion circuit 20・Reference value setting circuit 21・Ratio I#9 circuit 22・
Flip-flop circuit 23/set temperature switching circuit

Claims (1)

[Claims] A resistance-voltage conversion circuit that converts a resistance value corresponding to the temperature of the hot air detected by the temperature sensor into a voltage, and a reference value setting circuit that outputs a voltage corresponding to the target temperature of the hot air, are connected to both circuits. When the output of the resistance-voltage converter circuit is below the reference value, it outputs an “H” level signal, and when it is above the reference value, it outputs an “H” level signal.
A comparator circuit has a built-in comparator with an open collector output that outputs an L" level signal, and the output terminal of this comparator circuit is connected to a flip-flop circuit containing a JK flip-flop, and the signal is output from the output terminal. "H"
There is a set temperature switching circuit that turns on when a level signal is output, and sends an output corresponding to a temperature lower than the target temperature of hot air to the comparator circuit, and a set temperature switching circuit that turns on when a level signal is output to
The gate drive circuit is equipped with a gate drive circuit that sends a heater energization command to the gate of the switching element by the current supplied from the constant voltage power supply when the push button switch is turned on when the H" level signal is output, and starts energizing the heater. A temperature control device for a hot air drying device, characterized in that the temperature of the hot air is controlled at a temperature slightly lower than the target temperature, and then the temperature of the hot air is raised to the target temperature.