JPS647339B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drying rate detection device for a dryer that detects the drying rate of a material to be dried using a detection electrode installed in a rotating drum.

Traditionally, in drum-type dryers, a pair of detection electrodes are installed inside the rotating drum serving as the drying chamber, and a pair of annular slip rings concentric with the rotation center of the rotating drum are attached to the outer surface of the rotating drum. is electrically connected to the pair of detection electrodes, and a pair of brushes are brought into sliding contact with the pair of slip rings, so that the detection electrodes are connected to the drying material from the pair of brushes as the rotating drum rotates. The electrical resistance value of the clothing detected by contacting the clothing is read out as drying rate data,
A device has been proposed that detects that the clothes have been dried to a predetermined drying rate based on this drying rate data and stops the drying operation. However, the conventional configuration described above has the disadvantage that the sprung is relatively large and has a complicated structure.Furthermore, since the brush is constantly in sliding contact with the sprung, the wear of both is significant, making it difficult to read the drying rate data accurately. was difficult.

The present invention has been made in view of the above circumstances, and its purpose is to install a detection electrode having a contact in a rotating drum, and to connect the detection electrode electrically to the detection electrode so as to respond to the electrical resistance value detected by the detection electrode. A data storage capacitor that stores drying rate data of the material to be dried by discharging is attached to the rotating drum, and the data storage capacitor is connected to the contactor periodically in accordance with the rotation of the rotating drum. By attaching a brush to an appropriate stationary part to read out the dryness rate data stored by the device and charge the data storage capacitor, the contactor of the detection electrode can be made smaller than the conventional slip ring. It is an object of the present invention to provide a drying rate detecting device for a dryer that can be easily constructed and simplified in structure, can minimize abrasion between a contactor and a brush, and can reliably read drying rate data.

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

First, the basic configuration will be described according to FIG. Reference numeral 1 designates a rotary drum serving as a drying chamber rotatably disposed in an outer box (not shown), and a front end plate 2 of the rotating drum 2 has an opening 3 for loading and unloading clothes to be dried at approximately the center thereof, and a peripheral side plate 4. Three buffles 5 are formed at regular intervals and extending in the axial direction to protrude inward. 6 is a mounting board attached to the inner surface of one buttful 5 of the rotating drum 1;
This extends in the axial direction of the rotary drum 1, and its front end passes through the front end plate 2, is curved, and is attached to the front end plate 2 to form an auxiliary base plate 7. Reference numerals 8 and 9 denote a pair of elongated electrodes, which are attached to the mounting board 6 so as to be parallel to each other with a predetermined interval, and their front ends are arranged along the outer surface of the auxiliary board 7. The contacts 10 and 11 are formed in an extended manner. Therefore, since the contacts 10 and 11 form a part of the detection electrodes 8 and 9, respectively, they are electrically connected to the detection electrodes 8 and 9. Reference numeral 12 denotes a mounting member located on the front end plate 2 side of the rotary drum 1 and attached to an outer box which is a suitable stationary part, and on which three brushes 13, 14 and 15 are mounted at a predetermined distance from each other. The proximal end of is attached. In this case, brush 15
The tip of the brush 14 and the rotating drum 1
They are bent so that they are located on the same circumference around the axis, that is, the center of rotation. Each time the rotating drum 1 makes one revolution in the direction of arrow A, the tip of the brush 13 comes into contact with the contactor 10, and the brushes 14 and 15
The tip of the contactor 11 comes into contact with the contactor 11, and the timing of the contact will be described together with the operation described below.

Now, the configuration of the electric circuit will be described according to FIG. 16 is between the detection electrodes 8 and 9 (brushes 10 and 11
A data storage capacitor is connected to the rotary drum 1, for example, on the outer surface of the baffle 5 having the detection electrodes 8, 9. Then, the brush 13 is set to zero potential,
The brush 15 is connected to the DC power supply voltage +V via the resistor 17.
is connected to the power terminal 18 provided with the brush 14
is connected to the input terminal of the determination circuit 19. This determination circuit 19 detects the voltage between the terminals of the capacitor 16, and when the voltage is below a predetermined level, it generates an operation command signal from the output terminal, and when it reaches a predetermined level, it generates a stop command signal. The output terminal is connected to the input terminal of the drive circuit 20. This drive circuit 20 constitutes a control circuit 21 together with the determination circuit 19,
When an operation command signal is given from the determination circuit 19, the electric heater 22 serving as a heat source for supplying hot air into the rotating drum 1 and the drive motor 23 for driving the blower fan (not shown) are energized and activated, and the determination circuit 19 When a stop command signal is given, first the electric heater 22 is cut off, and then the drive motor 23 is cut off after a predetermined period of time. still,
The drive motor 23 also rotates the rotary drum 1 in the direction of arrow A.

Next, the operation of this embodiment having the above configuration will be explained with reference to FIG. When a power switch (not shown) is turned on, first, the determination circuit 19 generates an operation command signal, and based on this, the drive circuit 20 starts to energize the electric heater 22 and the drive motor 23.
Hot air is supplied into the rotary drum 1, and the rotary drum 1 is rotated in the direction of arrow A by the drive motor 23, thereby starting a drying operation. When the rotary drum 1 is rotated in the direction of arrow A, the brushes 13, 14, 15 are
comes into contact with the contacts 10 and 11, but in this case, first the brush 13 contacts (turns on) the contact 10 as shown in figure a, and then the brush 14 comes into contact with the contact 11 as shown in figure b. The brush 15 comes into contact (on) (time t ₁ ), and at this time, as shown in Figure c, the brush 15
is in a non-contact (off) state with respect to the contactor 11. Thereafter, the brush 14 is brought into a non-contact (off) state with respect to the contactor 11 after a short time (time t ₂ ), and then the brush 15 is brought into contact (on) with the contactor 11 after a short time (time t ₃ ). When the brush 15 comes into contact with the contact 11, the power terminal 18, the resistor 17,
The capacitor 16 is charged almost instantaneously through the path of the brush 15, the contact 11, the capacitor 16, the contact 10, and the brush 13, and as shown in Figure d, the detected voltage Va, which is the voltage between its terminals, is a constant high level voltage. (time t ₃ ). Furthermore, after a short period of time, the contact 1 is attached to the brush 13.
Brush 1 is in a non-contact (off) state with respect to 0.
5 becomes in a non-contact (off) state with respect to the contactor 11 (time t ₄ ). Thereafter, as the rotary drum 1 rotates, the clothes to be dried inside are stirred by the buffle 5, but during the stirring, the clothes come into contact with the pair of detection electrodes 8 and 9 intermittently. The pair of detection electrodes 8 and 9 detect the electrical resistance value of the clothing when it comes into contact with the clothing. That is, every time clothing comes into contact with the detection electrodes 8 and 9, the capacitor 1
The charges charged in the clothes are discharged according to the electrical resistance value of the clothing, and the detection voltage Va gradually decreases from a constant voltage. In this case, the electrical resistance value of the clothes is low when the drying rate at the final stage of drying is low, and increases as the drying progresses, that is, as the drying rate increases, and therefore the drying rate of the clothes is low. When the drying rate of the clothes is small, the discharge amount of the capacitor 16 is large every time the clothes come into contact with the detection electrodes 8, 9, and the detection voltage Va decreases significantly.On the other hand, when the drying rate of the clothes is high, the clothes come into contact with the detection electrodes 8, 9. The amount of discharge of the capacitor 16 is small each time the capacitor 16 is discharged, so that the detected voltage Va does not drop so much.As a result, the detected voltage Va of the capacitor 16 indicates the drying rate data of the clothes. The data will be memorized. Therefore, the time t ₄ at the beginning of the drying operation
Thereafter, each time clothing comes into contact with the detection electrodes 8, 9, the detection voltage Va of the capacitor 16 decreases significantly, and finally the capacitor 16 completes discharging and the detection voltage Va becomes zero (0). Thereafter, when the rotating drum 1 makes one revolution in the direction of arrow A, the brushes 13, 14
comes into contact with the contacts 10 and 11 again (time t ₅ ), and the detected voltage Va of the capacitor 16 is read out via the contact 10 and the brush 14 and applied to the determination circuit 19. At this time, since the detected voltage Va is zero, which is lower than the predetermined level, the determination circuit 19 continues to generate the operation command signal. Similarly, the capacitor 16 is charged to a high level when the brush 15 comes into contact with the contactor 11, and the capacitor 16 is discharged when clothing comes into contact with the detection electrodes 8 and 9, that is, the drying rate is a decrease in the detection voltage Va. Detection voltage due to data storage update and brush 14 contacting contactor 11 due to one revolution of rotating drum 1
The reading of Va, that is, the drying rate data, is sequentially and periodically repeated. After that, when the drying rate of the clothes becomes almost complete and the drying rate becomes high, the detection voltage Va charged to a high level in the capacitor 16 will not decrease much even if the clothes come into contact with the detection electrodes 8 and 9. When the brush 14 comes into contact with the contactor 11 and the contactor 11 is read out and inputted to the determination circuit 19, the determination circuit 1
9 starts generating a stop command signal, the drive circuit 20 turns off the electric heater 22, and after a predetermined time, turns off the drive motor 23, thus completing the drying operation.

According to this embodiment, the detection electrodes 8 and 9 having the contacts 10 and 11 located on the front end plate 2 side of the rotation drum 1 are provided on the inner surface of the buffle 5 of the rotation drum 1. , 9 is attached to the rotating drum 1, and brushes 13, 14, 15 are mounted on the outer box to contact the contacts 10 and 11 every rotation of the rotating drum 1.
is attached, and by contacting the contacts 10 and 11 of the brushes 13 and 14, the detected voltage Va, which is the drying rate data of the capacitor 16, is read out.
Since the capacitor 16 is repeatedly charged, which is the basis of the drying rate data, by contacting the contacts 10 and 11 of the contactors 10 and 15,
11, it can be made smaller and simpler in structure than conventional slip rings,
Also, the brushes 13, 14, 15 are the contacts 10 and 1.
1, the rotating drum 1 periodically makes contact with each rotation of the rotating drum 1, so unlike conventional slit printers and brushes that are in constant contact, there is significantly less wear. There is no difficulty in reading the data, and the data can be read accurately.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but can of course be implemented with appropriate modifications within the scope of the gist.

As described above, the present invention can be made smaller in size and simpler in structure than the contactor of a detection electrode and a conventional slip ring, and can minimize wear between the contactor and the brush. Therefore, it is possible to provide a drying rate detection device for a dryer that has excellent effects such as being able to reliably read drying rate data.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the principle configuration showing one embodiment of the present invention, FIG. 2 is an explanatory diagram of the configuration of an electric circuit of the same embodiment, and FIGS. 3 a to 3 are waveform diagrams of various parts for explaining the operation. . In the drawing, 1 is a rotating drum (drying room), 8 and 9
is a detection electrode, 10 and 11 are contacts, 13 to 1
5 is a brush, 16 is a data storage capacitor, 21
is a control circuit, 22 is an electric heater (heat source), 23 is a drive motor, and Va is a detection voltage (drying rate data).

Claims (1)

[Claims] 1. A rotating drum serving as a drying chamber, a detection electrode having a contact mounted in the rotating drum so as to come into contact with the material to be dried and detect its electrical resistance value, and a detection electrode that is electrically connected to the detection electrode. a data storage capacitor that is attached to the rotating drum and stores drying rate data of the material to be dried by discharging according to the detected electric resistance value of the detection electrode; a brush for reading drying rate data stored in the data storage capacitor and charging the data storage capacitor by periodically contacting the contactor according to the rotation of the dryer. Drying rate detection device.