JPH031900A - Dryer - Google Patents

Abstract

PURPOSE:To equalize the time period required for two types of units, which are used in two regions of different power source frequencies, to control the drum stop position, by a method wherein in case a drum is rotated by a very low speed from a certain position and stopped by a position detecting signal, a motor is operated at a very low speed by energizing and de-energizing the motor according to a duty ratio which is determined in accordance with the power source frequency. CONSTITUTION:After a power is on, an operating controller circuit 48 counts the pulses from a wave shaping circuit 54 to judge the power source frequency, and stores it. When a drum stop signal is input, a magnet 24 of a component of a position detector 25 brakes a motor 9 magnetically after detecting a fact that a drum 16 rotates for a specified rotating angle from a fixed position P, and stops the drum temporary just before a certain position where an exit 4a coincides with a drum opening 16a, at a point R, for example. Then, the drum 16 is rotated at a very low speed, however in this case, the motor 9 is energized and de-energized at a duty ratio corresponding to the power source frequency of 50Hz or 60Hz in accordance with the result of judgement on the power source frequency. Thereby, the rotating speeds in a very low speed operation become nearly the same regardless of the power source frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a dryer comprising a drum having an opening in its body that corresponds to an inlet and an inlet of a material to be dried.

(Prior Art) In this type of dryer, for example, a top-loading type dryer, when the rotation of the drum is stopped at the end of the drying operation, a It is necessary to match the entrance and exit of the material to be dried. As an example of such a dryer, there is one that is provided with a position detection means that outputs a detection signal when the entrance and exit of the drying object of the main body coincides with the opening of the drum. In this configuration, when stopping the rotation of the drum, first, upon receiving a detection signal from the position detecting means, electromagnetic braking is applied to the motor that rotationally drives the drum to stop the drum. The stopping position of the drum is such that the opening of the drum has passed the entrance/exit of the main body, so the drum is then reversed, and when a detection signal is received from the position detecting means again, the motor is electromagnetically braked and the drum is stopped. It is to stop it.

(Problem to be Solved by the Invention) However, the conventional configuration described above requires a configuration in which the drum is reversed, so two tension boots are required for the belt that transmits the driving force of the motor to the drum, one in the forward direction and the other in the reverse direction. The disadvantage was that the configuration was complicated.

In order to solve this problem, when the drum rotates only in one direction, and when the drum rotation is stopped, the motor is electromagnetically braked when a detection signal is received from the position detection means, and the drum is stopped in its opening position. After that, the drum is rotated in the same direction at a speed much slower than normal rotation, that is, at a speed at which the drum immediately stops when electromagnetic braking is applied, and then the position is detected again by the position detection means. A conceivable configuration is to electromagnetically brake the motor to stop the drum when a signal is received.

By the way, in general, in this type of dryer, in order to maintain the same rotational speed of the drum even if the power supply frequency is different, the reduction ratio of the speed reduction device installed between the motor and the drum is set to 60Hz. The dryer is designed to be larger than dryers for 50Hz frequency regions. This means that the torque required to rotate the drum is different between a model for 60 Hz and a model for 50 Hz.

However, as mentioned above, when rotating the drum at a slow speed in drum stop position control, the motor is turned on and off at a predetermined duty ratio;
The ratio is the same for different power supply frequencies, so the torque produced by the motor during that period is the same. For this reason,
For areas with a power frequency of 5 OHZ, the dryer has a power frequency of 60 Hz.
Compared to those for the Hz region, there is a problem that the rotation speed when rotating the drum at a slow speed is lower, and the time it takes to rotate at a slow speed becomes longer, which increases the time required for the drum to stop. Ta.

Therefore, an object of the present invention is to provide a dryer in which the time required to control the drum stop position can be made as uniform as possible in two types of models intended for regions with different power supply frequencies, and in which parts such as a microcomputer can be made common. There is something to do.

[Structure of the Invention (Means for Solving the Problems)] The dryer of the present invention includes a drum having an opening in the body that corresponds to the entrance and exit of the material to be dried; and a speed reduction device that reduces the speed and transmits the speed at a speed reduction ratio corresponding to the speed, rotates the drum in one direction, and stops the drum with its opening aligned with the entrance/exit when a drum stop signal is given. In a device that controls the drum stop position as shown in FIG.
There are two types of duty ratios that can be selected depending on the power supply frequency, and after braking by the braking means, the motor is turned on at one of the duty ratios from before the opening of the drum coincides with the entrance/exit. The drum is rotated at a very slow speed by applying an electric current to the drum, and the drum is rotated to a position where the opening of the drum coincides with the entrance/exit. A stop means for applying a braking force to the drum to stop the drum when receiving a detection output from the position detecting means is provided, and when rotating the drum at a slow speed, the duty of the slow speed driving means is adjusted accordingly based on the power supply frequency. -Duty for determining the ratio--The feature is that it is provided with a ratio determining means.

(Operation) According to the above means, when stopping the rotation of the drum, the drum is braked after a drum stop signal is given, and the drum is rotated at a slow speed from just before the fixed position where the entrance and exit coincide with the opening, When a detection signal is received from the position detection means, the drum is braked and stopped. Therefore, since the drum is not reversed, the configuration can be simplified. In this case, when rotating the drum at a slow speed, the duty ratio of the slow speed driving means is determined based on the power supply frequency, and the motor is turned off in accordance with this duty ratio to rotate the drum at a slow speed. For this reason, if the drum stop position control described above is performed in two types of models with different power supply frequencies and therefore different reduction gear ratios and motor starting torques, it is possible to control the motor speed according to the power supply frequency when the drum rotates at very low speed. Since starting torque is obtained, the rotational speed during slow rotation can be made almost the same regardless of the power supply frequency, and the time during slow rotation can be made uniform.

(Embodiment) First, in FIG. 2, reference numeral 1 denotes a main body, for example, an outer box, which is composed of an outer box main part 2 and a cover 3 that closes a rear opening of the outer box main part 2. The outer box main portion 2 includes an upper cover portion 4 and a body portion 5 having a substantially U-shaped cross section. As shown in FIG. 4, the upper cover portion 4 is formed with an entrance 4a for storing items to be dried, such as clothing, and thus the outer box 1 is provided with the entrance 4a, for example, on the upper surface. Further, the upper cover part 4 is provided with a lid 6 for opening and closing the entrance/exit 4a, and
An operation panel 7 shown in FIG. 5 is provided. Now, A shown in FIG. 3 is a unit covered by the above-mentioned outer box 1, and this unit A will be described below.

In FIG. 3, 8 is a plywood made of plastic, for example, and 9 is a motor fixed to the base plate 8 via a motor support 10. One support plate 11 is erected at the rear end of the base plate 8 by screwing. Also, the base plate 8
At the front end of the support plate 11, the other support plate 12 is erected with screws, facing the support plate 11. 13 is a casing, which has its front and rear lower ends supported by support plates 11 and 12.
The support arms 11a and 12a protrude from the support arms 11a and 12a, respectively, and are supported by screws. This casing 13 has
For example, a double-winged fan 14 is rotatably disposed. Reference numeral 15 denotes a drum support member, which has support arm portions 11b (
(only one of which is shown) is supported by screws, respectively.

Reference numeral 16 denotes a drum for storing the material to be dried, which has a shaft portion 17 provided at the center of the right side surface in FIG. is rotatably provided between the drum support member 15 and the casing 13 by being supported by the drum support member 15 via a bearing 19 . Now, the above drum 1
An opening 16a (see FIG. 4) that corresponds to and has the same size as the entrance/exit 4a is formed in the body of the drum M2.
0 is provided so as to be slidable in the circumferential direction (see FIG. 3). Reference numeral 21 denotes a pressing member that slidably presses the drum lid 20, and this is attached to the body of the drum 16.

Here, a mounting member 2 is attached to the upper end of the drum support member 15.
2 is provided in a protruding manner to face the body of the drum 16. 23 is, for example, a reed switch disposed on the back surface of the mounting member 22 so as to face the presser member 21 of the drum 16, and 24 is a magnet attached to the presser member 21 to form a pair with the reed switch 23. , these reed switch 23 and magnet 24 constitute a position detection means 25. This position detection means 25 is
When the entrance/exit 4a and the opening 16a match, that is, when the magnet 24 approaches the reed switch 23, an on signal, which is a detection signal, is output, and at other times, an off signal is output. Incidentally, 26 and 27 are reinforcing plates that extend between the casing 13 and the drum support member 15 and are screwed together.

In addition, when the fan 14 rotates in the casing 13, as shown in FIG. 4, the warm air inside the drum 16 is sucked into the left side of the fan 14 through the filter set 28 and the intake port (not shown), and After being guided to the casing cover 29 also shown in FIG. brought back inside. At the same time, the air outside the outer box 1 is sucked into the right side of the fan 14 in FIG. 4 from the outside air intake port 3a of the cover 3 through the intake cover 34, and as described above, After exchanging heat with the air from the drum 16 flowing on the left side,
The outside air is discharged from the outside air outlet 8a of the base plate 8. The air from the drum 16 is dehumidified by the heat exchange, and the water generated by the dehumidification is discharged to the outside from the drainage hole 30a provided at the bottom of the connecting duct 30 and the drainage hole 8b of the base plate 8. There is. A belt 37 for driving the drum is passed between a pulley 35 and a tension pulley 36 attached to the rotating shaft of the motor 9 and the drum 16, and the motor 9 moves the drum 16 in one direction, for example. It is designed to be rotationally driven in the direction of arrow B shown in FIG.

In addition, a pulley 3 attached to the rotating shaft of the motor 9
A belt 40 for driving the fan is passed between the pulley 39 of the fan 14 and the motor 9, and the fan 14 is rotationally driven by the motor 9. Furthermore, in FIG. 4, reference numeral 41 denotes an electrode disposed at the bottom of the drum support member 15 facing into the drum 16, which outputs an electric signal in accordance with the cloth resistance.

On the other hand, in FIG. 5 showing the operation panel 7, 42 is a start/stop switch, 43 is a heater changeover switch, 44 is a power switch, and 45 to 47 are indicator lamps such as light emitting diodes.

Now, in FIG. 1 showing the electrical configuration, numeral 48 is an operation control circuit for controlling the drying operation, which includes a microcomputer, and in addition to the drying operation control function, a braking means and a slow speed operation means. , a stopping means, and a duty ratio determining means. The operation control circuit 48 receives switch signals from the start/stop switch 42 and the heater changeover switch 43 as well as a detection signal from the position detection means 25.

4 is a clock pulse generation circuit that provides a clock pulse to the operation control circuit 48, and 50 is a dryness detection circuit, which detects the dryness of the object to be dried based on the electric signal given from the electrode 41. When the dryness detection value reaches a predetermined value, a dryness determination signal is given to the operation control circuit 48.

51 is a drive circuit for driving the motor 9 and heater 33; 52
53 is a rectifier circuit that applies a DC power supply voltage to the operation control circuit 48, and a lid open/close detection switch that detects whether the lid 6 is opened or closed. Here, 54 is a waveform shaping circuit, which generates a pulse every time it detects a zero crossing of a sine wave of the AC power source, and supplies the pulse to the operation control circuit 48.

Next, the operation of the above configuration will be explained with reference also to FIGS. 6 and 7.

FIG. 7 shows the contents of the portion of the control program stored in the operation control circuit 48 that stops the rotation of the drum 16, that is, the functions of the braking means, slow speed driving means, stopping means, and duty ratio determining means. There is. When the start/-time stop switch 42 is operated to start the drying operation, first, the time t required for the drum 16 to rotate by a predetermined rotation angle, for example, 0.7 rotations, is calculated. Specifically, based on the detection signal from the position detection device 25, it is necessary for the drum 16 to rotate once, that is, for the magnet 24 to rotate from the home position at point P in FIG. 6 until it reaches the home position again. Steps 81 to S to measure time T (i.e. rotation period)
6), let time t be the value obtained by multiplying that time T by 0°7 (
Step S7).

Then, such calculation of the time t is repeated until the drum stop signal is input (proceed to rNOJ in step S8). Further, for example, after the power is turned on prior to the drying operation, the operation control circuit 48 receives a pulse from the waveform shaping circuit 54 and determines whether the power frequency is 50H2 or 60Hz by counting the pulses. , and stores the determination result.

Now, when the drying operation ends or when the start/- stop switch 42 is operated to temporarily stop the drying operation and a drum stop signal is input, the magnet 24 is positioned at point P in FIG. It is detected that the drum 16 rotates by 0.7 rotations from the normal position of the drum 16. In this case, when time t has elapsed after the drum 16 reached the home position, the drum 16 rotates 0.7 rotations at that point, and the magnet 24 is located at the point Q in FIG. 6, and the above detection is performed. is done (step S2.S3.S9) and
At this point, by electromagnetically braking the motor 9, for example by energizing the motor 9 in a half-wave for 1.5 seconds (step 510), the drum 16 is moved near the front of the home position where the entrance 4a and the opening 16a coincide. For example, in FIG. 6, the magnet 24 is temporarily stopped at a point R, which is a position before point P. Note that the time for electromagnetically braking the motor 9 (1.5 seconds in this case) may be set as appropriate depending on the rotational speed of the drum 16, that is, the time T.

Subsequently, after the above-mentioned time stop, the drum 16 is rotated at a slow speed until it reaches the fixed position. In this case, it is determined whether the power supply frequency is 50H2 or not based on the determination result of the power supply frequency. Step 51
2) When the frequency is 50Hz, the duty ratio is to turn on the motor 9 for 0.06 seconds and turn it off for 0.1 seconds (power frequency 5
The drum]-6 is rotated at a slow speed by turning off the power at a duty ratio corresponding to 0 Hz (step 813). On the other hand, when the power supply frequency is not 50Hz, that is, when it is 60Hz, the motor 9 is turned on and off for 0.03 seconds and off for 0°1 seconds (duty ratio corresponding to the power supply frequency of 60H2). The drum 16 is rotated at a slow speed (step 514). As a result, even if there are two types of models in which the reduction ratio of the reduction gear is different due to the difference in the power supply frequency and the starting torque of the motor 9 is different, the motor 9 is energized and disconnected at the corresponding duty ratio, and the drum 16 rotates at a very slow speed, so the rotational speed during slow rotation is almost the same regardless of the power supply frequency. This rotational speed is a speed at which the drum 16 immediately stops if the motor 9 is electromagnetically braked. After this, when the drum 16 reaches the home position, i.e. the sixth
In the figure, when the magnet 24 reaches point P from point R,
When the entrance/exit 4a and the opening 16a match, the position detection means 2
5 outputs an ON signal, and the motor 9 is electromagnetically braked. For example, the motor 9 is energized in a half-wave for 0.5 seconds (step 515), so that the drum 16 is turned on with the entrance 4a and the opening 16a aligned. rotation stops.

According to this embodiment having such a configuration, when the rotation of the drum 16 is stopped, after receiving the ON signal from the position detection means 25, the drum 16 is rotated until the time t has elapsed so that the drum 16 is at a fixed position. The drum 16 is rotated 0°7 rotations from the position, and at this point, that is, when it is detected that the drum 16 has rotated to the point Q (see Fig. 6), the motor 9 is electromagnetically braked, and the drum 16 is rotated 0°7.
6 is stopped at a point R (see FIG. 6), which is a position near the regular position where the entrance/exit 4a and the opening 16a coincide, and then the drum 16 is rotated at a slow speed to detect the position detecting means 25. When an ON signal is received from the motor 9, the motor 9 is electromagnetically braked to stop the drum 16. Therefore, since the drum 16 is not inverted, a reversing configuration is not required and the configuration can be simplified. In this case, when rotating the drum 16 at a slow speed, the duty ratio of the slow speed driving means is determined based on the power frequency, and the motor 9 is energized at this duty ratio to rotate the drum 16 at a slow speed. let

Therefore, even in two types of models where the reduction ratio of the reduction gear and the starting torque of the motor 9 are different due to different power frequencies, if the drum stop position control described above is performed, it is possible to adjust the speed according to the power frequency when the drum 16 rotates at a very low speed. Since the starting torque of the motor 9 can be obtained, the rotational speed during slow rotation can be made almost the same regardless of the power supply frequency, and the time for slow rotation can be made uniform. As a result, the time required to control the drum stop position can be made as similar as possible regardless of the region where the power supply frequency is different. The operation control circuit 48 for controlling the drum stop position can be shared by two types of dryers for regions with different power supply frequencies, and parts such as a microcomputer that constitute the operation control circuit 48 can be shared. can.

In the above embodiment, a point P, which is the position where the entrance/exit 4a and the opening 16a coincide, and a point R, which is in the vicinity of this position.
The drum] 6 is rotated at a very low speed for a short period of time, so
The time required for stopping can be shortened. In particular, in this case, when stopping the drum 16, the motor 9 is electromagnetically braked, so the braking force is stronger than when stopping the motor by cutting off the power, and the drum 16 can be controlled to stop accurately at a fixed position. obtain. In this case, since the braking force is strong, the speed during slow simultaneous rotation can be set to a certain degree of speed, and the time required to stop can be further shortened.

Furthermore, since only one position detection means 25 is provided,
The configuration can be simplified.

Further, in the above embodiment, the position detecting means 25 is constituted by the reed switch 23 and the magnet 24, but it is not limited to this, and may be constituted by, for example, a Hall element and a magnet.

FIG. 8I and FIG. 9 show a second embodiment of the present invention, in which the same parts as in the first embodiment are given the same reference numerals, and different parts will be explained.

In FIG. 8, 55 is an operation control circuit, which includes a microcomputer, and in addition to the drying operation control function, has the functions of braking means, slow speed operation means, stopping means, and duty ratio determining means. have. Reference numeral 56 denotes a frequency discrimination signal output circuit, which supplies a discrimination signal corresponding to the power supply frequency to the operation control circuit 55. in particular,
The frequency discrimination signal output circuit 56 has a power supply frequency of 50Hz.
When the high level discrimination signal is
A low-level discrimination signal is given when . In this case, for example, during manufacturing, the power supply frequency is 50Hz.
For regional products, a DC voltage of 5V is applied to the input terminal of the operation control circuit 55, and the power supply frequency is 60V.
For those for the Hz region, the input terminal of the operation control circuit 55 is configured to be grounded.

In this second embodiment, as shown in FIG. 9, when the drum] 6 is rotated at a slow speed, the power supply frequency is
When determining whether or not the frequency is 0 Hz, the determination is made based on the determination signal from the frequency determination signal output circuit 56 (step 516). Here, if the discrimination signal is at a high level, the power supply frequency is 50Hz, and in this case, the motor 9
The drum 16 is rotated at a slow speed by turning on and off the power at a duty ratio of 0.606 seconds on and 0.1 seconds off (step 81).
3). On the other hand, if the discrimination signal is at low level 5, the power supply frequency is 60Hz, so in this case, the motor 9 is set to 0.
．． 03 seconds on, 0. The drum 16 is rotated at a slow speed by turning off the power at a duty ratio of OFF for ] seconds (step 514).
.

Therefore, in this second embodiment as well, substantially the same effects as in the first embodiment can be obtained.

[Effects of the Invention] As is clear from the above description, the present invention has two types of duty ratios that can be selected depending on the power supply frequency, and by turning the motor on and off at one of the above duty ratios. Since the configuration is provided with a slow speed operation means for rotating the drum at a slow speed, and a duty ratio determining means for determining a duty ratio of the slow speed operation means based on the power supply frequency when rotating the drum at a slow speed, the power source Even in the case of two types of models intended for regions with different frequencies, the time required to control the drum stop position can be made as uniform as possible, and furthermore, parts such as a microcomputer can be used in common, which is an excellent effect.

[Brief explanation of the drawing]

1 to 7 show a first embodiment of the present invention, in which FIG. 1 is an electrical configuration diagram, FIG. 2 is an overall perspective view, and FIG. 3 is a state with the outer box removed. FIG. 4 is a perspective view, FIG. 4 is a longitudinal sectional rear view of the entire system, FIG. 5 is a front view of the operation panel, FIG. 6 is a schematic longitudinal sectional side view for explaining the operation, and FIG. 7 is a flowchart. 8 and 9 are a diagram corresponding to FIG. 1 and a diagram corresponding to FIG. 7, respectively, showing a second embodiment of the present invention. In the drawing, 1 is the outer box (main body), 4a is the entrance/exit, 16 is the drum, 16a is the opening, 25 is the position detection means, 48° 5 is the operation control circuit (braking means. Slow speed operation means. Stopping means. Duty) - ratio determination means).

Claims (1)

[Claims] 1. A drum that has an opening in its body that corresponds to the entrance and exit of the material to be dried in the main body, and a speed reducer that reduces and transmits the rotation of a motor to this drum at a speed reduction ratio that corresponds to the power frequency. The drum is rotated in one direction, and when a drum stop signal is given, the drum stop position is controlled so that the drum is stopped with its opening aligned with the entrance/exit, after the drum stop signal is given. It has a braking means for braking the drum, and has two types of duty ratios that can be selected depending on the power supply frequency, and after braking by the braking means, the motor is driven by one of the above from before the opening of the drum coincides with the entrance/exit. a slow-speed operation means for rotating the drum at a very slow speed by turning on and off electricity at a duty ratio of; a position detection means for outputting a detection signal when the drum is rotated to a position where the opening of the drum coincides with the entrance/exit; stopping means for applying a braking force to the drum to stop the drum when receiving a detection output from the position detecting means during slow rotation; and when rotating the drum at slow speed, the slow speed operation is based on the power supply frequency. A dryer comprising: duty ratio determining means for determining a duty ratio of the means.