JPS6346839Y2 - - 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 provided in a rotating drum. A contact element electrically connected to the detection electrode is provided on the rotating drum, and slides into contact with the contact element according to rotation of the rotating drum, while the detection electrode moves from near a lower position to a predetermined angle in the rotation direction. By arranging a brush at an appropriate stationary position to successively display the detection resistance value of the detection electrode as drying rate data, the accurate drying rate of the object to be dried can be reliably detected with a simple configuration. An object of the present invention is to provide a drying rate detection device for a dryer.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

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 long detection 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 contactors 10 and 11 are formed in such a manner that the contactors 10 and 11 are extended to each other. 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. 12 is rotating drum 1
This is a mounting member attached to an outer box which is a suitable stationary part located on the front end plate 2 side of the brush, and the base ends of two brushes 13 and 14 are attached to this with a predetermined distance from each other. ing. And rotating drum 1
brushes 13 and 1 every time it rotates once in the direction of arrow 15.
The tips of the brushes 4 are adapted to come into sliding contact with the contacts 10 and 11, respectively, but in this case, the tips of the brushes 13 and 1
4 has a detection electrode 8 on the contacts 10 and 11,
The respective positions and length dimensions are set so that as the rotary drum 1 rotates, the rotary drum 9 is in sliding contact with the rotary drum 1 while moving from near the lower position of the rotary drum 1 to a predetermined angle in the direction of the arrow 15.

Now, the configuration of the electric circuit will be described according to FIG. The brushes 13 and 14 are connected to input terminals of a determination circuit 16, and the output terminal of the determination circuit 16 is connected to an input terminal of a drive circuit 17. Then, the determination circuit 16 detects the electrical resistance value between the detection electrodes 8 and 9 via the brushes 13 and 14, and when this exceeds a predetermined value, generates an operation command signal from the output terminal and continuously repeats the predetermined value multiple times. It is designed to generate a stop command signal when the following conditions occur:
Further, when the drive circuit 17 receives an operation command signal from the determination circuit 16, it energizes an electric heater 18, which is a heat source for supplying hot air into the rotary drum 1, and a drive motor 19 (not shown) for driving a blower fan. When a stop command signal is given from the determination circuit 16, the electric heater 18 is first turned off, and then the drive motor 19 is turned off after a predetermined period of time. Incidentally, the drive motor 19 is adapted to also rotate the rotary drum 1 in the direction of the arrow 15.

Next, the operation of this embodiment having the above configuration will be explained. When a power switch (not shown) is turned on, the determination circuit 16 first generates an operation command signal, and based on this, the drive circuit 17 energizes the electric heater 18 and drive motor 19, and hot air is supplied into the rotating drum 1. At the same time, the rotary drum 1 is rotated in the direction of arrow 15 by the drive motor 19, and as a result of this rotation, the baffle 5 located near the lower position scoops up the clothes to be dried inside and moves it to the upper position. By dropping it nearby, it is stirred and the drying operation is started.
Then, when the baffle 5 on the side where the detection electrodes 8 and 9 are provided is at a substantially lower position and scoops up the clothing, the clothing comes into contact with the detection electrodes 8 and 9, and
The detection electrodes 8 and 9 come to detect the electrical resistance value of clothing. In this case, the electrical resistance value of the clothing is low when the drying rate is low and increases as drying progresses, i.e., the drying rate increases, and therefore the electrical resistance value of the clothing is The drying rate data will be shown. The electrical resistance value of the clothing is periodically output and input to the determination circuit 16 each time the brushes 13 and 14 come into sliding contact with the contacts 10 and 11 as the rotary drum 1 rotates in the direction of the arrow 15. However, when the drying rate of the clothes is small, the detected electrical resistance value will exceed the predetermined value,
The determination circuit 16 will continue to generate the operation command signal. Thereafter, when the drying rate of the clothes becomes high when the clothes are almost completely dried, the detected electrical resistance value becomes less than a predetermined value, and the determination circuit 16
generates a stop command signal when it detects that the detected electrical resistance value is less than a predetermined value several times in succession, and the drive circuit 17 cuts off the electric heater 18 and then cuts off the drive motor 19 after a predetermined period of time. The power will come on and the drying operation will end.

By the way, the rotational speed of the rotating drum 1 is normally set so that the centrifugal force applied to the clothing is slightly smaller than the gravity of the clothing, and when the clothing reaches a substantially upper position as the rotating drum 1 rotates, it falls. I'm starting to do that. Then, the Batsuful 5 scoops up this fallen clothing and carries it to the upper position again, so that the clothes are picked up by the Batsuful when the Batsuful 5 is moving from near the lower position to a predetermined angle in the direction of arrow 15, which is the rotation direction. 5 will be most strongly pushed. On the other hand, when detecting the electrical resistance value of clothing with the detection electrodes 8, 9, the greater the contact pressure of the clothing with the detection electrodes 8, 9, the more reliable the detection can be. That is, even if the drying rate of the clothes is constant and the specific resistance of the clothes is the same, the detected electrical resistance values of the detection electrodes 8 and 9 will differ depending on the contact pressure mentioned above. Detection is reliable when the contact pressure is greatest between near the lower position of the rotating drum 1 and a predetermined angle in the rotation direction, but when it is at a position other than this, the contact pressure becomes small and detection becomes uncertain. Become. Therefore, conventionally, the rotating drum 1
A pair of annular slip rings concentric with the center of rotation of the rotating drum 1 are attached to the outer surface of the rotary drum 1, and these are electrically connected to a pair of detection electrodes 8, 9, and a pair of brushes are attached to these pair of slip rings. The detection electrodes 8 and 9 from the pair of brushes contact the clothes to be dried as the rotating drum 1 rotates, and the electrical resistance value of the clothes to be dried is detected as drying rate data. However, this results in the continuous output of certain drying rate data and uncertain drying rate data, resulting in a problem where only uncertain drying rate data can be output one after another. be. On the other hand, according to this embodiment, as described above, the detection electrodes 8 and 9 have the highest contact pressure with respect to the detection electrodes 8 and 9 of clothing between the vicinity of the lower position of the rotating drum 1 and a predetermined angle in the rotation direction. Since the electrical resistance value of the clothing is detected and displayed one after another only when the electrical resistance value of the clothing is large, the electrical resistance value of the clothing can always be detected reliably.

According to the above embodiment, unlike conventional slip rings, the contacts 10 and 11 are not annular and are provided only partially, so that the contacts 10 and 11 are different from conventional slip rings. The brushes 13 and 14 can be made small and have a simple structure, and the brushes 13 and 14 are similar to the contacts 10 and 1.
1 and the rotary drum 1 periodically every rotation, so unlike conventional slip springs and brushes that are in constant contact, there is significantly less wear, and drying rate data continues to be generated due to poor contact due to wear, etc. It does not become difficult and can be performed accurately one after another.

FIG. 3 shows another embodiment of the present invention, in which the same parts as in FIG. 1 are denoted by the same reference numerals, and only the different parts will be explained below. 20 is rotating drum 1
This is a mounting board located between the buttfuls 5, 5 adjacent to the circumferential side plate 4 of the rotary drum 1, which faces the inside and outside of the rotating drum 1, and has detection electrodes 21, 22 on its inner surface. is attached, and contacts 23 and 24 are attached to the outer surface. In this case, the detection electrode 21 and the contact 23 are made of the same conductor, and the detection electrode 22 and the contact 24 are made of the same conductor, and are embedded in the mounting board 20. A mounting member 25 attached to an appropriate stationary portion is located below the rotating drum 1, and this mounting member 25 has brushes 26, 2
The proximal end of No. 7 is attached. Then, each time the rotating drum 1 rotates once in the direction of the arrow 15, the brush 26
The tips of the brushes 26 and 27 come into sliding contact with the contacts 23 and 24, respectively.
and 27 are connected to the contacts 23 and 24 at the ends 21a and 2 on the rotational direction side of the detection electrodes 21 and 22.
The respective positions, lengths, etc. are set so that as the rotary drum 1 rotates, the respective positions and lengths are in sliding contact while moving from the vicinity of the lower position to a predetermined angle in the direction of the arrow 15. Therefore, this embodiment can also provide the same effects as those of the previous embodiment.

In each of the above embodiments, one of the pairs of detection electrode 8 and contactor 10, detection electrode 9 and contactor 11, detection electrode 21 and contactor 23, and detection electrode 22
The rotary drum 1 may also serve as one of the sets of contacts 24.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the gist.

As described above, the present invention can provide a drying rate detecting device for a dryer that has a simple configuration and has a practical effect of being able to reliably detect the accurate drying rate of an object to be dried.

[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 the electric circuit of the same embodiment, and Fig. 3 is an explanatory diagram of the principle configuration showing another embodiment of the invention. It is a diagram. In the drawing, 1 is a rotating drum (drying chamber), 5 is a baffle, 8 and 9 are detection electrodes, 10 and 11 are contacts, 13 and 14 are brushes, 18 is an electric heater (heat source), 19 is a drive motor, 21 and 22 are detection electrodes, 23 and 24 are contacts, and 26 and 27 are brushes.

Claims (1)

[Claims for Utility Model Registration] 1. A rotating drum serving as a drying chamber, a detection electrode provided in the rotating drum that contacts the object to be dried and detects its electrical resistance value, and a detection electrode electrically connected to the detection electrode. and a contactor provided on the rotating drum, and a contactor provided at an appropriate stationary part so that as the rotating drum rotates, the detection electrode slides into contact with the contactor and moves from near a lower position to a predetermined angle in the rotational direction. A drying rate detecting device for a dryer, comprising a brush for successively outputting the detected resistance value of the detecting electrode as drying rate data. 2. The drying rate detection device for a dryer according to claim 1, wherein the detection electrode is provided in a baffle formed on the rotating drum so as to protrude inward.