JPS5917400A - Control apparatus of dryer - 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] “1′″°””m＋＊　　　　　　　　　j,.

The present invention detects the dry state of clothes and automatically dries them.
.

The present invention relates to a control device for a dryer that ends a drying operation.
□Conventional structure and its problems Conventionally, when drying clothes using a dryer, it was common to set a timer to an appropriate time and operate the dryer. In this case, if the set time is incorrect, there is an inconvenience that drying may be insufficient or overdrying, which may damage the clothes. To solve this inconvenience, various dryness detection devices have been proposed. Although these measures have been implemented, major problems remain. For example, there is a method of detecting the drying state based on the temperature difference between the outside air temperature and the exhaust temperature of the dryer, but in this method, when there are only a small amount of clothes to be dried, the heated outside air is directly exhausted and the clothes are still completely dry. However, there is a problem in which the temperature difference between the outside air and the exhaust air reaches a predetermined value and the operation ends even though the temperature difference between the outside air and the exhaust air reaches a predetermined value. Some devices detect the average resistance value between these electrodes, but
This mainly has the following three problems. The first is that the electrodes for resistance measurement are exposed inside the storage chamber, which is a safety issue.The second is that since high resistance is being measured, the influence of leakage current of the circuit itself becomes large. 3. Since the resistance value detection method can only detect dryness up to about 96%, after that it is necessary to set a relatively long delay time of 10 to 20 minutes to delay the end of drying. Purpose of the Invention The present invention is intended to solve the above-mentioned conventional inconveniences and problems, and to prevent the occurrence of insufficient or overdrying of clothes depending on the type of clothing. Structure of the Invention The present invention detects static electricity generated on the surface of clothing as the clothing dries to detect dryness, and is characterized by the structure of the static electricity detection container.

A common method for detecting static electricity is to measure the potential near the object where static electricity is generated, but in this case, a reference potential must be set separately and the potential difference from that potential must be measured. . Normally, this type of measurement is performed using the ground potential as a reference, but even if electrical appliances such as dryers are equipped with a grounding terminal, some users may not connect them to the ground. Therefore, in order to use the ground potential as a reference, it is possible to use one side of the power line of the equipment used as a reference, but with this method, the polarity of the power plug has a large effect, and the power plug is inserted in the opposite direction. In this case, the reference power line is connected not to the ground but to the side on which the commercial power supply is superimposed, which may make correct measurement difficult.

The present invention attempts to perform rational static electricity detection by using the exterior casing of the dryer, which surrounds the static electricity generating object, as the standard of potential for static electricity measurement.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail. FIG. 1 shows the basic structure of the present invention, in which 1 is the exterior casing of the entire dryer, which is made of a conductive material. 2 is a storage for storing clothes; o3 is an electrode for detecting static electricity provided in the storage 2;
4 is a dryness detection unit that detects the potential difference between the static electricity detection electrode 3 and the exterior housing 1 to detect the amount of static electricity generated on the clothing, and detects when the amount of static electricity generated on the clothing reaches a predetermined level. An output signal is output after a certain period of time has passed. 6 is a drying means such as a heater or a fan for drying the clothes in the storage storage 2; 6 is a drying operation control section that operates to stop the operation of the drying means 6 by receiving an output signal from the dryness detection section 4; It is.

FIG. 2 shows the schematic structure of this embodiment, in which 1 is an exterior casing, 7 is a cylindrical rotating drum with a rotation axis in the horizontal direction, 8 is a fixed wall, and 9 is an opening/closing device for taking clothes in and out. The storage 2, which is a flexible door and stores clothes, is composed of a rotating drum 7, a fixed wall 8, and a door 9. 10 is a heater that heats the outside air taken in; 11 is a storage chamber 2 for storing the outside air;
12 is a motor for rotating the rotary drum 7 and fan 11; 13 is a motor 12;
14 is a belt that transmits the rotational motion of the motor 12 to the fan 11. 016 is a belt filled with the static electricity detection electrode 3. FIG. 3 shows the structure of the sensor unit 16. □It is a built-in sensor unit.

-3 is a static electricity detection electrode, and 16 is a resin layer for electrically insulating the static electricity detection electrode 3 from the clothes to be dried. If this continues, when drying synthetic fibers, etc., the surface of the resin layer 16 will become charged due to friction even if the clothing is not dried, and accurate detection of static electricity will not be possible.
A conductor layer 17 is provided on the surface.

Next, the electrical circuit configuration shown in FIG. 4 will be explained. 1
8 is a power plug, 19 is a power switch, and 20 and 21 are switching elements that control power supply to the motor 12 and heater 10, respectively, which are assumed to be conductive during drying operation. 0 22 is a static electricity detection electrode 3 and When the clothes are not dry, the potential at the position of the static electricity detection electrode 3 is stable, but when the clothes become dry, This electrical potential begins to fluctuate as the clothing becomes electrically charged due to friction. When the drying of the clothes progresses and this potential fluctuation reaches a predetermined level, the static electricity detection section 22 outputs an output signal. Reference numeral 23 denotes a timer part which delays the end of drying by a certain period of time until a completely dry state is reached even if it receives an output signal from the static electricity detection section 22, and outputs an output signal when that period of time has elapsed. The static electricity detection section 22 and the timer section 23 constitute the dryness detection section 4.

When the timer part 23 outputs an output signal, the switching element 21 receives this and stops energizing the heater o. 2
Reference numeral 4 denotes an air blowing time delay section, which energizes the motor 2 for a predetermined period of time even if the output signal of the timer section 23 is generated, thereby lowering the temperature inside the storage warehouse 2.

In addition, the drying operation control section 6 includes switching elements 20 and 21.
and a ventilation time delay section 24.

In addition, 26 is a transformer, and 26 is a power supply circuit, which generates a DC voltage with a positive potential at the positive output side terminal 27 and a negative potential at the ground side terminal 28, and supplies current to the drying detection section 4 and the drying operation control section 6. .

FIG. 6 shows the circuit configuration of the static electricity detection unit 22, where 29 is a terminal for connecting the static electricity detection electrode 3, 3° is a terminal for connecting the exterior housing 1, and 31 is a positive output side terminal 27 of the power supply circuit 26.
32 is the ground terminal 28 of the power supply circuit 26.
Terminal 33 is an output terminal of the static electricity detection section 22. Exterior casing ≦ 1 is also connected to the ground side of the static electricity detection section 22 via the resistor 34;
In order to make the potential of the static electricity detection electrode 3 fixed in the housing inside the exterior housing equal to the potential of the ground side of the static electricity detection unit 22, and to be able to detect the potential of the static electricity detection electrode 3 with reference to the potential of the ground side of the static electricity detection unit 22. It is.

36 and 36 are resistors, 37 is a Zener diode, 3
8 is a capacitor, 39 is an operational amplifier, a resistor 36 is connected between the positive potential side of the power supply of the static electricity detection unit 22 and the positive input terminal of the operational amplifier 39, and a resistor 35, a Zener diode 37, and a capacitor 38 are connected to the operational amplifier 39. The zero resistor 36 and resistor 36 connected between the positive input terminal and the ground side are for applying a predetermined DC bias to the static electricity detection electrode 3, and the Zener diode 37 and capacitor 38 are for protecting the operational amplifier 39. belongs to. Since static electricity is very small in terms of energy, it is necessary to use a high resistance of several MΩ for the resistor 35 and the resistor 36, and it is desirable to use a capacitor 38 with a small capacity of about 100 pF. The potential of the static electricity detection electrode 3 is determined by the operational amplifier 3.
The impedance is lowered by 9 and the operational amplifier 3
Appears on the output terminal of 9.

When the clothes are not dry and are not charged with static electricity, the potential of the static electricity detection electrode 3 is stable at the potential determined by the resistor 36 and the resistor 36, but when the clothes are dry and are not charged with static electricity, the potential of the static electricity detection electrode 3 is stable. , the potential of the static electricity detection electrode 3 begins to fluctuate, and the output terminal voltage of the operational amplifier 39 also begins to fluctuate with the same magnitude.

4o is a resistor, 41 is an electrolytic capacitor, and these are connected in series between the output terminal of the operational amplifier 39 and the ground side. It works to remove harmful noise such as.

42 is an electrolytic capacitor, and 43 is a resistor, which are connected in series between the positive potential side of the electrolytic capacitor 41 and the ground side. A potential signal of the static electricity detection electrode 3 from which harmful noise has been removed is generated on the positive potential side of the electrolytic capacitor 41, but this potential signal is heavily influenced by the DC voltage determined by the resistor 36 and the resistor 36. A differential circuit composed of an electrolytic capacitor 42 and a resistor 43 generates only the variation of this potential signal across the resistor 43.

A diode 44 is connected in parallel with the resistor 43 and performs half-wave rectification of the waveform of the potential fluctuation signal of the static electricity detection electrode 3. 47 is an operational amplifier, and the positive input terminal is diode 4.
Connected to the cathode of 4.

45 and 46 are resistors, the resistor 45 is connected between the negative input terminal of the operational amplifier 47 and the ground side, the resistor 46 is connected between the negative input terminal and the output terminal of the operational amplifier 47, and these resistors 46. Resistance 46. The operational amplifier 47 constitutes an in-phase amplifier circuit, and amplifies the half-wave rectified potential fluctuation signal of the static electricity detection electrode 3 applied to the positive input terminal of the operational amplifier 47.

48 and 49 are resistors, and 50 is an electrolytic capacitor, which generates an average voltage of the half-wave rectified and amplified potential fluctuation signal of the static electricity detection electrode 3 across the resistor 49.

51 is a Zener diode, 62 is a resistor, 63 is a comparator, 64 is a resistor, and the resistor 62 is connected between the positive potential side of the power supply of the static electricity detection unit 22 and the comparator. The resistors 64 are respectively connected between the positive potential side of the power supply and the output terminal of the comparator field. Resistor 52 causes an appropriate current to flow through Zener diode 51, and Zener diode 61 applies its Zener voltage to the inverting input terminal of comparator 53 to set a reference voltage. The resistor 54 is used to set the potential of the output terminal of the comparator 53 to either the positive potential side of the power supply or the ground potential.

When the average voltage of the potential fluctuation signal of the static electricity detection electrode 3 applied to the non-inverting input terminal of the comparator 63 exceeds the Zener voltage of the Zener diode 51 applied to the inverting input terminal of the comparator 530, the voltage at the output terminal of the comparator 53 rises from zero to near the power supply voltage.

That is, at this time, the voltage at the output terminal 33 of the static electricity detection section 22 rises, and the static electricity detection section 22 outputs an output signal.

The voltage at the output terminal 33 of the static electricity detection unit 22 rises.
・When the temperature rises, the timer part 23 starts operating, and thereafter the drying operation is terminated according to the above-mentioned process.0 Effects of the Invention As is clear from the above embodiments, the drying detection structure using static electricity detection of the present invention is effective in controlling the exhaust temperature and Compared to the conventional method of detecting the difference in temperature from the outside air, this method works reliably regardless of the amount or type of cloth, and since static electricity is not generated until the drying rate of clothes reaches close to 1oofb. , the delay time until drying is completed is only about a few minutes, and compared to the method of detecting the resistance value of clothing, it is possible to set a delay time close to the necessary and sufficient delay time, making it a very effective dry detection method. be. Further, according to the present invention, since the potential reference for detecting static electricity generated by clothing is the potential of the exterior casing, the polarity of the power plug and whether or not the user is grounded are not affected. Stable static electricity detection can be performed. Therefore, according to the present invention, it is possible to reliably realize a dryness detection system using this effective static electricity detection method without causing malfunctions, and the present invention is very useful.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of a dryer according to the present invention, and FIG. 2 is a block diagram showing a schematic configuration of a dryer according to an embodiment of the present invention, where (a) is a front view and (b) is a front view. is a longitudinal section,
Figure 3 shows the sensor unit; Figure (a) is a front view, Figure (b) is a sectional view taken along line x-x' in Figure 4 (a), and
The figure is an electrical circuit diagram thereof, and FIG. 6 is an electrical circuit diagram of the static electricity detection section. 1...Exterior casing, 2...Accommodation storage, 3.
...Static electricity detection electrode, 4...Drying detection section, 6...Drying means, 6...Drying operation control section, 7... Rotating drum, 8...Fixed wall, 9...Door, 15...Sensor unit, 20.21...Switching element, 2
2... Static electricity detection section, 23... Timer part, 24... Air blowing time delay section, 26...
...Power supply circuit. Name of agent: Patent attorney Toshio Nakao and one other person 1.
1. . Figure 3 (Q)

Claims (2)

[Claims] (1) An exterior casing made of a conductive material, a storage for storing clothes, a drying means for drying the clothes, a drying operation control section for controlling the operation of the drying means, and fixed in the storage. The amount of static electricity generated on the clothing is detected by detecting a potential difference between a static electricity detection electrode that detects the amount of static electricity generated on the clothing, and the exterior casing and the static electricity detection electrode. and a dryness detection section that outputs an output signal when determining that the clothes are dry, and an output end of the dryness detection section is connected to the drying operation control section,
A control device for a dryer, wherein the drying operation control section is configured to stop the operation of the drying means by receiving an output signal from the dryness detection section. (2) The dryness detection unit is connected to the static electricity detection unit that outputs an output signal when the average value of fluctuations in potential difference between the static electricity detection electrode and the exterior housing exceeds a predetermined value. 2. The dryer control device according to claim 1, further comprising a timer portion which outputs an output signal after a predetermined period of time has elapsed after receiving the output signal of the static electricity detection section.