JPH01215361A - Centrifugal liquid removing device - Google Patents

Abstract

PURPOSE:To improve the liq. removing performance of the title device and to reduce the drying energy and drying time by specifying the angle of the conical wall surface to the direction of the exerted centrifugal force. CONSTITUTION:The angle theta of the conical wall surface 17a of the rotary drum 1 to the direction F of the exerted centrifugal force is controlled to 90-160 deg.. As a result the water content of the washing after centrifugal liq. removal can be remarkably reduced as compared with the conventional method, the water content in the drum can be practically uniformized, the drying time is reduced, overdrying can be prevented, the sticking of the washing to the inner surface of the drum is prevented, and the centroid of the unbalanced load on the drum can be approached to the centroid of the drum.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to, for example, a dehydration (washing) tank in a domestic washing machine, a commercial water washer, a dry cleaner, or various other centrifugal dehydrators for industrial use. The present invention relates to an applicable centrifugal dewatering tank.

It can also be applied to fully automatic washing, dehydrating, and drying machines for domestic and industrial use that continuously perform washing, dehydration, and drying.

[Conventional technology]

A rotating drum type dehydrating device that uses centrifugal force to remove liquid can be used in household washing machines, commercial washing machines, dry cleaners that use organic solvents, or centrifugal dehydrators for general industrial use. , the basic structure related to liquid removal is the same. Therefore, here, the prior art will be explained using a domestic washing machine as an example.

That is, in the prior art, as shown in FIGS. 7(a) and 7(b), the dehydration tank 1a has a circular cross-sectional shape and an aperture ratio of 10 to 10.
A rotating drum 2a consisting of a circumferential wall of a 2096 perforated plate, and a rotating shaft 3a that supports and rotates this rotating drum 2a.
, a motor 4a that drives the rotating shaft 3a, and the like. 9a is a hole penetrating the wall surface 7a, 10a is a drain pipe disposed at the bottom of the dehydration tank 1a, and 40a is a vibration-proof rubber interposed between the motor 4a and the machine base.

The washed laundry 5a is transferred from the washing tub (not shown) to the dehydration tub 1a, the lid 6a is closed, and the required time is set using a timer switch (not shown), etc., and the rotating drum 2a is activated by the motor. 4a, the washing object 5a is rotated at high speed, and the water in the washing object 5a is discharged from a circumferential wall surface 7a made of a perforated plate or the like concentric with the rotation center axis of the rotary drum 2a.

Regarding the above-mentioned prior art, the present inventor set the laminated cotton cloth 5'a on the inside of the circumferential wall surface 7a to the same thickness as shown in FIG. The moisture content of each sheet of the laminated cotton cloth 51a was measured. As a result, as shown in FIG. 9, the water content of the cotton cloth 5'a near the circumferential wall surface 7a is about twice that of the cotton cloth 5'a away from the circumferential wall surface 7a, that is, the cotton cloth 5' near the rotation axis. The rate was shown.

This is because, in FIG. 8, the circumferential wall surface 7a is perpendicular to the direction 8a in which centrifugal force acts.

This is because the water held between the cotton cloth 51a and the circumferential wall surface 7a is swamped by the wall surface and is prevented from moving and cannot be removed. On the other hand, the water in the cotton fabric 5Ia, which is one circumferential wall surface 7a away, passes through the capillaries in the cotton fabric layer 5Ia and moves smoothly in the direction of action 8a of the centrifugal force, so as to move toward the center of the rotating drum 2a as shown in FIG. The moisture content of the cotton fabric 5'a near the circumferential wall surface 7a is lower than that of the cotton fabric 5'a near the circumferential wall surface 7a.

Furthermore, the moisture content of the cotton fabric 51a near the circumferential wall surface 7a tends to increase as the thickness of the cotton fabric layer 51a decreases. This is a cotton fabric layer 5'a (circumferential wall surface 7
This is thought to be because the weight of the layer farthest from a) is small and the squeezing effect is reduced.

[Problem to be solved by the invention]

As mentioned above, conventional dehydration equipment.

Since the circumferential wall surface 7a of the rotating drum 2a and the direction 8a in which the centrifugal force acts are perpendicular to each other, the water to be washed 5a near the circumferential wall surface 7a is not sufficiently drained, which is estimated based on the magnitude of the centrifugal force. It has a fundamental defect in that it does not exhibit sufficient dehydration performance. Also, as a matter of course, extra energy and time are spent on drying the washed items after dehydration.

The present invention has been made to solve these problems, and provides a centrifugal dewatering device that exhibits the original dewatering performance and at the same time reduces energy and time spent during drying. This is what I am trying to do.

[Means to solve the problem]

Therefore, in the present invention, the wall surface of the rotating drum is constructed as a wall surface that is not perpendicular to the direction of action of centrifugal force, and the angle of the drum shape is set at an angle of 90° to 160°, which solves the above problem. It is intended as a solution to this problem.

[Effect]

The main reason for the moisture content distribution in the cotton fabric layer as shown in Figure 9, that is, the abnormally high moisture content near one circumferential wall surface, is as follows.
As mentioned above, the circumferential wall surface extends parallel to the drum rotation center axis, and the direction of action of centrifugal force and the circumferential wall surface are perpendicular to each other, resulting in poor drainage. Therefore.

Basically, should all or part of the circumferential wall be shaped so that it is not parallel to the drum rotation center axis?

Alternatively, instead of making the circumferential wall surface a simple circle, it is possible to take any means of making the circumferential wall surface into a shape that does not intersect at right angles to the direction of action of the centrifugal force.

Therefore, by adopting these measures, the liquid that collects at a position away from the holes on the drum wall is affected by centrifugal force, flows toward the wall at a predetermined angle, and is easily discharged from the nearby holes. This greatly reduces the moisture content of the deliquified material after treatment.

At this time, the water content can be reduced by reducing the angle of the chevron, but in the case of a machine where laundry clings to the drum and performs washing, dewatering, and drying in one process, from these points of view, it is necessary to have a desirable angle. I understand.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show an embodiment of the invention.

First, to explain the example shown in Fig. 1, Fig. 1(a) is a side sectional view of the deliquing tank and a part of the drive shaft, and Fig.
FIG. 2 is a sectional view taken along line A-A.

As is clear from the figure, the liquid removal tank 12 according to this embodiment
a is circular at any position in the plane cross section, but the axis of rotation 1
In a longitudinal cross section taken including section 3a, the wall/surface 17a and the axis of rotation 13a form a predetermined angle. In the illustrated example, the entire deliquid tank 12a has a urn-like shape with a bulge in the middle in the height direction.

Here, with respect to the acting direction F of the centrifugal force, the liquid removal tank 12 a
The chevron-shaped angle of the wall surface 17a is θ (as shown in Fig. 1(a)).
shall be. Figures 4 and 6 show data obtained by measuring the residual water percentage of the cotton fabric layer while changing the angle θ of the mountain shape.

These are the towels that were dehydrated at 350 G for 4 minutes. Here, G represents rotational acceleration.

27Il:n 2 G = 9.8 x (6o) R Ni drum radius (m) n
It can be calculated using the number of drum rotations (rpm).

As shown in FIG.
), the cotton fabric layer with a moisture content of 8 ㎡ has an angle of 120°
°, it becomes 6596, and 1596 water can be expelled from the cotton cloth. Furthermore, if this angle is set to 60°, the water content becomes 6096, which is an improvement of 2096 compared to the conventional method.

On the other hand, as shown in Fig. 6, in the case of the apparatus of the present invention, even the cotton cloth near the wall of the dehydrating drum can be sufficiently dehydrated, and furthermore, the water content distribution after dewatering in the direction of the center of the rotating drum is large. There is no change, and the dehydration effect is increasing overall.

That is, in the conventional drum, there is a large unevenness in the water content between the circumferential wall surface of the drum and toward the center of the drum, and the water content is high, with a water content of 9096 on the circumferential wall of the drum and 6596 toward the center of the drum.

However, if the drum angle (θ) is 120°,
The difference in moisture content between the drum circumferential wall surface 7096 and the drum center direction 6396 is small, and the overall value is small.
In other words, it was found that the water was dehydrated efficiently.

On the other hand, FIG. 5 shows as an index whether a cotton fabric layer such as a towel sticks to the drum wall surface or the force required to peel off the cotton fabric layer when the drum crest angle θ is changed.

That is, when the chevron angle is 180' (conventional drum), when peeling perpendicular to the direction of centrifugal force acting on the drum (
When peeling off with a force of about 10 (for vertical use) or a force in a direction perpendicular to the direction of centrifugal force (horizontal pulling), the drum has a hole 19a that penetrates the wall for draining water, so there is a hole in this hole. It is difficult to remove by horizontal pulling because the cotton fabric layer is embedded, but
The cotton fabric layer is peeled off with a force of about 70', whereas if the chevron angle is set to a small value 1, for example 60', it will peel off at a force of 180'.
, 240, which is close to or above the index 2°, the cotton fabric layer clings to the drum wall surface and cannot be peeled off without applying force from the outside, making it impractical.

Therefore, in order to improve the moisture content compared to conventional drums and prevent sticking to the drum,
It has been found that it is practical to set the angle θ of the drum ridge shape to 90' to 160°, preferably 120' to 150°.

Next, an embodiment in which the washing, dehydrating, and drying steps shown in FIGS. 2 and 3 are performed continuously will be described.

Rotating drum: A cylindrical rotating drum that is rotatable while keeping the rotating shaft 3 substantially horizontal, and includes a pulley 4 fixed to the rotating shaft, a driving V-belt 5. It is driven by a transmission path of a driving pulley 6 fixed to a motor 7. Holes 19 for ventilation and water passage are provided in the outer cylindrical surface 10 of the drum.

2: Outer body: Located outside the drum.

A drum support 8 consisting of a bracket and bearings that support the drum rotating shaft 3 is fixed to one side, and water and steam are poured into the drum 1 on the other side.

A blowing section 9 for supplying heated air and the like is fixed.

3: Rotating shaft: It is fixed to the drum 1 and serves as a drum driving shaft.

4: F''-9... This is a pulley for driving the drum 1 and is fixed to the 1-rotation shaft 3.

5: Belt...For transmitting power to drive the drum l.

6: Pulley...... is fixed to the motor 7, and transfers the rotational force of the motor to the belt 5. It is transmitted to the drum rotating shaft 3 via the pulley 4.

7: Motor: A power source for driving the drum 1, and the rotation speed is set by the speed variable device 30.

8. Drum support: Consists of plackets and bearings, and supports the rotating shaft 3 of the drum.

9: Blower unit: Fixed to the inlet of the drum outer shell 2, and feeds water, steam, heated air, etc. into the drum 1. It has a ring shape and has an opening 20 on its inner peripheral surface.

The drum 1 has a structure that prevents the supplied heating medium, such as water, steam, or heated air, from leaking to the outside.

]O: Outer cylindrical surface...the outer periphery of the drum 1, the outer cylindrical surface 1
0 is provided with a hole 19 for ventilation 1 and water passage.

The cross section of the outer cylinder surface perpendicular to the direction of the rotational axis is circular;
As shown in FIG. 2, the axial cross section has a chevron-shaped angle θ.

12: Laundry: Towels, sheets, shirts, etc. that are washed, dehydrated, and dried.

15: Duct: As shown in Fig. 1, it is fixed to the side of the drum outer shell 2, and feeds heated air into the drum 1.

16: Door...When putting linen into drum 1,
It opens and remains closed during the washing, spin-drying, and drying processes. The inner surface of the door is in close contact with the blowing part 9 of the outer shell 2 of the drum, and the structure is such that water, steam, heated steam, etc. do not leak to the outside of the outer shell 2.

17: Beater: A plurality of chevron-shaped plates attached to the outer cylindrical surface 10 of the drum 1, which have the effect of lifting the linen upward as the drum 1 rotates.

18: Seal: It is fixed to the drum outer body 2 and has a structure that slides on the outer cylindrical surface 10 of the drum 1. It serves to prevent heated steam, heated air, etc. supplied into the drum 1 from the blowing section 9 from leaking into the outer shell 2 entering the drum 1.

19: Hole: A hole in the diameter bottom part made on the outer circumferential surface of the drum 1, during the washing process, the inside of the drum 1 and the outer body 2
Washing water, detergent, etc. are brought in and out.

In the dewatering process, as the drum 1 rotates at high speed, water shaken off from the linen is discharged into the outer shell through these holes.

In the drying process, heated air supplied into the drum 1 supplies energy into the drum 1 to dry the linen, after which the air is discharged through the holes 19 into the outer shell 2 and out of the machine.

20: Opening: A hole drilled in the inner peripheral surface of the blowing section 9, through which heated steam, heated air, etc. are supplied into the drum 1.

21: Water supply pipe...This is a pipe that feeds water for submersion into the drum l.

22: Drain pipe: Used to drain water from the drum outer shell 2 during the washing process or during the dewatering process, and controls whether water is drained by opening or closing the damper 23.

23: Damper...When draining water from the outer shell 2, the damper 23 opens, and the washing water in the outer shell 2 and the water shaken off by dehydration are discharged from the outer shell 2 to the drainage groove 32 outside the machine. . The damper 23 is closed when no water is being drained from the outer shell 2.

24: Heater: When supplying heated air into the drum 1, a blower (not shown) sucks air from outside the machine, and the heater 24 heats indoor air and sends it into the drum 1. The heater is generally of a type that exchanges heat between steam or heating oil and room air.

26: Exhaust port: Provided in a part of the outer shell 2 of the drum, and is an opening for discharging the air inside the outer shell 2 to the outside of the machine.

27: Lint filter...The air exhausted from inside the drum l contains a large amount of linen lint. For this purpose, the air discharged through the exhaust port 26 is passed through the lint filter to capture the lint contained in the exhaust air.

28: Exhaust duct: This is a duct for discharging the exhaust gas from which lint has been removed through the lint filter 27 to the outside of the machine.

30: Speed variable device: This is a device for adjusting the rotational speed of the motor 7, and is controlled so that the drum 1 is rotated at an optimal speed in each of the washing process and the dehydration process.

31: Vibration isolator: The drum 1, outer shell 2, etc. are suspended on the vibration isolator.

32-2 drain groove: This is a groove for draining water discharged from the drain pipe 22 to the outside.

According to the embodiment configured in this way, the (washing) water supply pipe 2
Drum water from 1 to 1. A certain amount of water is supplied into the outer shell 2. Since the drum 1 has holes 19 on its outer circumferential surface, water supplied into the drum 1 passes through the holes 19 and accumulates inside the outer shell 2.
The water level in drum 1 gradually rises. The water level is checked with a water level detection device (not shown), and water supply is stopped when the water level reaches a certain level. The door 16 is opened and linen is fed into the drum 1. The motor 7 is driven to rotate the drum l at a constant rotation. Repeated forward and reverse rotation of the drum 1 is effective in preventing linen from getting tangled.

Detergent and auxiliary agents are supplied to drum 1 from a detergent and auxiliary agent supply device (not shown).
Supply the water inside the tank and perform pre-washing. Once the pre-washing is finished,
Open the damper 23 and drain the washing water used for pre-washing into the drain pipe 2.
After a certain period of time or when a sensor (not shown) detects that the prewash water has been completely drained, the damper 23 is closed.

Next, in the same way, wash water is supplied into the drum l up to a certain water level,
Further, a detergent auxiliary agent is supplied into the drum l from a detergent/auxiliary agent supplying device (not shown).

Here, a steam nozzle (not shown) is operated to blow steam into the water in the outer shell 2 to raise the temperature of the washing water to a certain temperature. The rotation speed of the motor 7 can be varied by controlling the speed variable device 30 to rotate the drum l. When the laundry is lifted above the drum 1 by the beater 17 and dropped, the mechanical force caused by the impact with the water surface is further applied, and the drum 1 is vibrated by a vibration device (not shown) to change the relative velocity between the linen and the washing water. By forcibly increasing the size, the washing time can be shortened. ) The main washing is performed in warm water in this way, and then the drum 1 is rotated at medium speed to shake off the washing water adhering to the linen using centrifugal force. At this time, naturally, the damper 23 is opened to drain the washing water from the discharge pipe 22 to the outside of the machine. After this, the damper 23 is closed and water is supplied into the drum 1 again to remove soot and
Carry out the cutting process. The rinsing process may be similar to the washing process. Once the rinsing process, which involves repeatedly supplying and draining washing water, begins the dehydration process.

The (dewatering) drum 1 is controlled by a speed variable device 30 and is operated at a rotation rate in which the inner periphery of the drum receives an acceleration of 1 to 1.5 G. Because of this, the linen contained in the drum 1 can be distributed almost uniformly on the inner peripheral surface of the drum 1. After reaching this state, the drum 1 is rotated at high speed.

The water adhering to the linen is removed by centrifugal force from hole 1 in drum 1.
9 to the outside, and this water is drained from the outer shell 2 to the drain pipe 22.
It is then ejected from the aircraft.

Here, the results of testing by changing the drum angle θ are as already described in FIGS. 4 to 6. That is,
If θ is 60°, the water content after dehydration will be 6096,
The value can be 2096 smaller than the conventional value. On the other hand, as shown in FIG. 2(b), it was found that there was a problem in that the object to be washed 12 stuck to the outer cylindrical surface of the drum and did not fall automatically even when the dewatering process was completed.

For this reason, the angle of the chevron was made larger than 1°.

It was found that the items to be washed after dehydration fall freely when a slight impact occurs, for example, by activating a brake device (not shown) while the drum is rotating to suddenly stop the drum, and the practicality of this method has been confirmed.

Furthermore, in the case of a chevron-shaped drum as shown in Fig. 2, the items to be washed 12
is pushed out in the F direction by centrifugal force during the dehydration process,
It tries to concentrate on the part where the drum diameter is large, that is, the top of the mountain on the outer cylinder surface. For this reason, vibrations caused by unbalanced loads within the washing drum, which is a common problem in the dewatering process, are eliminated.

It was also found that the Motoyama-type drum has a structure in which an unbalanced load is generated at or near the center of gravity, making it ideal for suppressing vibrations during the dewatering process.

(dry) Near the end of the dehydration process, the heater 24 adds water.

The heated air is transferred to the duct 15. It is supplied into the drum 1 via the blowing section 9, and the drying process is directly carried out. At this time, if the items 12 to be washed are stuck inside the drum 1 as shown in FIG. That is impossible.

That is, in order to perform washing, dehydration, and drying in one step, it is important to be able to peel off the dehydrated object 12 from the outer cylindrical surface 10 of the drum 1 without manual intervention.

The number of revolutions of the drum is less than 16, preferably 0.7-0.8
Let it be G. A temperature or humidity sensor (not shown) is attached to the exhaust port 26, and when it detects that the temperature or humidity has become constant, the drying process is completed.

In the above-mentioned embodiments, the case where the number of ridges on the drum is one is explained, but the same effect can be achieved even if there is a plurality of ridges on the drum.

Further, although the case of washing with water has been described, it can also be applied to a dry cleaning machine using an organic solvent such as perchlorethylene.

〔Effect of the invention〕

According to the present invention, the moisture content of laundry after centrifugal dehydration can be greatly improved compared to the conventional method, and the distribution of moisture content within the drum can be made nearly uniform, thereby reducing the drying time. It can shorten the drying time and prevent overdrying, and also has various excellent effects such as preventing laundry from sticking in the drum and identifying unbalanced loads on the drum near the center of gravity of the drum. .

[Brief explanation of the drawing]

The first part shows a rotating drum that is an embodiment of the present invention, and FIG. Another embodiment of the present invention is shown in the same figure (
a) is an explanatory diagram of the main parts showing the cross section of the rotating drum and its driving configuration, FIG. Figure 4 is an explanatory diagram of the test results showing the drum angle and moisture content.
Fig. 5 is an explanatory diagram showing the test results of the drum angle and peeling force index, Fig. 6 is an explanatory diagram showing the moisture content distribution of the present invention and the conventional device, and Fig. 7 is the explanatory diagram of the conventional dehydrator. Figure (a) is a side cross-sectional view, figure (b) is a cross-sectional view taken along line A-A in (a), Figure 8 is an explanatory diagram as seen from the plane of the rotating drum during the dehydration test, and Figure 9 is a conventional apparatus. It is an explanatory view of dehydration test results. 1.2a...Rotating drum, 10...Outer barrel surface, 17
a...Wall surface of rotating drum, F...Direction of action of centrifugal force, 12...Object to be washed, θ...Champ angle.

Claims (1)

[Claims] A centrifugal dewatering device characterized in that the wall surface of the rotating drum is configured with a chevron-shaped wall surface that opens at an angle of 90° to 160° with respect to the direction of action of centrifugal force.