JPS5928997A - Drum type 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 [Technical Field of the Invention] The present invention relates to a drum dryer that uses a rotating drum as a drying chamber, stores clothes, etc. in the rotating drum, and dries the clothes while agitating them through rotation.

(Technical Background of the Invention) In this type of drum dryer, by rotating the rotary drum, the clothes and other items to be dried are scooped up and dropped, stirring and drying the clothes without any problems. I'm trying to get it.

[Problems with background technology]

However, although the stirring action has a certain correlation between the size and amount of cloth and the rotational speed of the rotating drum, conventionally, the rotational speed of the rotating drum is constant, so the amount of cloth is With a small number of sharpeners, clothes etc. will stick to the inner peripheral surface of the rotating drum due to centrifugal force, preventing stirring.
In addition, even if there is a large amount of cloth, there is no so-called cloth swapping between the center and the periphery, and furthermore, in the case of large items such as sheets, they simply roll into a ball in the lower part of the rotating drum. However, there was a problem in that the contact between the hot air and the cloth was limited, resulting in a decrease in drying efficiency.

[Purpose of the invention]

The present invention has been made to eliminate the above-mentioned drawbacks,
The purpose of this drum dryer is to continuously change the rotational speed of the rotating drum from low speed to high speed and back again to low speed to prevent the drying efficiency from drastically decreasing depending on the amount of cloth and the size of the cloth. Our goal is to provide the following.

[Summary of the invention]

The drum-type dry hat of the present invention is equipped with a speed control section, which controls the amount of cloth by continuously and repeatedly changing the rotational speed of the drive motor that drives the rotating drum between a predetermined high speed and a low speed. A good stirring effect of the material to be dried can be obtained regardless of the size of the material.

(Embodiment of the Invention) An embodiment of the present invention will be described below with reference to the drawings, but since the invention does not particularly relate to the structure of the dryer main body itself, these descriptions will be limited to a general description.

First, reference numeral 1 denotes an outer box of the main body of the dryer, which has a group of intake holes 3 and a group of exhaust holes 4 at a position sandwiching the door 2 on the front wall, and inside has a plurality of baffles 5 protruding on the inner peripheral surface. A rotary drum 6 is installed to dry W6a, a hot air generating section 9 consisting of a fan 7 and a heater 8, and a drive motor 10 for driving the rotary drum 6 and the fan 7 are arranged. Then, as shown by arrow a, outside air flows into the outer box 1 through the intake hole group 3.
After being sucked into the fan casing 7a, the hot air is drawn into the fan casing 7a, passes through the heater 8, becomes hot air, passes through the rotating drum 6, and is discharged from the exhaust hole group 4. Reference numeral 11 denotes a bell i~ which is hung between the pulley 10a of the drive motor 10 and the rotating drum 6.

Next, there is a control circuit J5 shown in Fig. 4, where 12 is a plug, 13 is a door switch, and 14 is a furniture switch.This temperature switch 14 detects the exhaust temperature and turns on the heater when the child is abnormally thirsty. 8 is designed to shut off the power. 1
A timer 5 controls the energization time of the heater 8 and the drive motor 10. Reference numeral 16 denotes an inverter that converts a commercial power source into an alternating current of a different frequency, and serves as a variable frequency power source for the drive motor 10. Reference numeral 17 denotes a frequency control section, which obtains time information from the timer 15 and periodically increases or decreases the output frequency of the inverter 16 with time, thereby changing the speed of the drive motor 10. The inverter 16 and frequency control section 17 constitute a speed control section 18.

Next, the operation of the above configuration will be explained. When the timer 15 is set to a predetermined time, the drive motor 10 and heater 8 are energized, and the rotary drum 6 is driven together with the fan 7 to dry the items 19 to be dried, such as clothes, which have been placed in the rotary drum 6 in advance. It will be done.

In this drying operation, the output frequency of the inverter 16 is repeatedly increased and decreased between predetermined frequencies f1 and 12 by the frequency control unit 17, and as a result, the rotational speed of the drive motor 10 is continuously increased and decreased. The increasing and decreasing changes are repeated, and the control characteristics change according to a predetermined control characteristic, for example, a sine wave, as shown in FIG. 5 with time T and speed N. In this embodiment, as shown in FIG. 5, the rotation speed of the rotary drum 6 is 55 revolutions per minute (N1) at frequency 11, and 39 revolutions per minute (N2) at frequency 2, with the average speed being changed every time. minute 4
Since the rotating drum 6 is set to 7 rotations (Na) and 1 period of speed change 1゛1 to 92 seconds, the rotating drum 6 has a high speed N1.
and low speed N2, the process of gradually increasing and then gradually decreasing is repeated.

5- According to this rotating drum 6 whose rotation speed changes continuously and repeatedly between a predetermined high speed and a predetermined low speed in this way, as shown in FIG. 6 (arrows indicate the rotation direction), the following exhibits an effect.

(b) When the amount of cloth is normal, when the rotating drum 6 is at a low speed N2, the cloth 19 moves downward as shown in FIG. 6(A), but as the rotation increases and reaches the average speed Na, the cloth 19 is scooped as shown in FIG. 6(B). Stirring is carried out by raising and falling, and when the rotation further increases to a high speed N1, it clings to the surroundings as shown in FIG. 6(C).

([1) When the amount of cloth is small, the cloth 19 is moved at the average speed Na and higher N1 as shown in Fig. 6 (
As shown in FIG. 6(B), the mixture sticks to the inner peripheral surface of the rotating drum 6, but at low speed N2, stirring is performed as shown in FIG. 6(B).

(c) When the cloth is large or in large quantity, the cloth 19 shifts downward as shown in FIG. 6 (A>) when the average speed is Na, but when the cloth is at a higher speed N1, the stirring shown in FIG. 6 (B) is performed, and In the case of 61 cases where there is a lot of cloth, which alternating changes in Figure 6 (A) and (R),
'', the cloth is also changed.

In this way, regardless of the amount and size of the cloth 19, the cloth 19 moves downward and is stirred during the process of changing the rotational speed of the rotating tram 6, so drying occurs due to the mismatch between the cloth state and the rotational speed. There is no unevenness, so you can dry evenly and efficiently.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and in particular, the speed change characteristic of the rotating drum can be changed to a desired continuous change characteristic, such as a triangular wave characteristic instead of a sine wave.

(Effects of the Invention) As mentioned above, the present invention involves continuously and repeatedly changing the rotational speed of a rotating drum between a predetermined high speed and a predetermined low speed. It is possible to provide a drum-type dryer that can obtain a good stirring effect on the material to be dried regardless of its size.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view, FIGS. 2 and 3 are a schematic vertical side view and a cross-sectional plan view, respectively, and FIG. 4 is a wiring diagram of a control circuit; Fig. 6 is a speed change characteristic diagram of the rotating drum, and Fig. 6 is an explanatory diagram of the action. In the figure, 6 is a rotating drum, 1o is a drive motor, 16I; 1
In the inverter, 17 is a frequency control section, and 18 is a speed control section. Applicant: Tokyo Shibaura Electric Co., Ltd. Fig. 1 Fig. 2 Fig. 3 (C
) Procedural amendment filed September 9, 1980, Patent Application No. 57-138272 to the Commissioner of the Japan Patent Office, Title of invention: Drum dryer 3, Person making the amendment: 4, Agent: 460 Address: Sakae, Naka-ku, Nagoya 4-6-15 Nissan Life Insurance Company Voluntary 6 Column for detailed explanation of the invention in the specification subject to amendment. 7. Contents of the amendment (1) The phrase ``without a groove'' written in the 19th line of page 1 of the middle cylinder of the specification is corrected to ``without evenly''. (2) "Extremely" written on page 2, line 11 of the specification is corrected to "locally."

Claims (1)

[Claims] 1. Equipped with a rotating drum that accommodates the material to be dried, a drive motor that rotates this rotating drum, and a speed control unit that repeatedly changes the rotational speed of this drive motor between a predetermined high speed and a predetermined low speed. A drum dryer made of