JPS6357099A - Drum type drier - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drum dryer that can be used for clothes dryers, dry cleaning machines, etc. that dry hotel linens, hospital standard bedding, etc. after washing them. It is something.

(Conventional technology) In the laundry industry, used dirty towels, sheets, wrappers, and other pieces of cloth (hereinafter referred to as linen) received from hotels, hospitals, etc. are processed and shipped as clean linen to hotels, hospitals, etc. are doing. The processing steps are (1) washing, (2)
) Dehydration, (3) Drying, and (4) Finishing. Items that need to be completely dried, such as towels, are processed in +11 to (3). Items that require ironing, such as sheets and wrappers, are processed in steps (1) to (4) ( However, step (3) is a short-time process.

That is, since sheets, wrappers, etc. are ironed in a subsequent process, a short drying process, for example 2 to 3 minutes, is sufficient, but towels need to be completely dried in the drying process.

If this drying is insufficient, there is a risk of mold forming on the surface of the towel, and in such a case, customers will complain about discomfort when using the towel at a hotel or the like. Therefore, the laundry industry takes great care in drying towels and the like. For this reason, the drying process generally takes about 25 to 30 minutes.

On the other hand, when looking at linen processing costs, the running costs account for less than 5% in the washing and dehydration processes, and more than 95% in the drying process. This is due to the fact that drying water requires more energy than washing and dehydrating, and also because energy usage efficiency is low.

In the conventional drying method, the linen that has been washed and dehydrated is placed in a rotating drum, and then the linen is placed inside the drum while rotating the drum at a rotational speed where the centrifugal acceleration on the inner circumference of the drum is less than the gravitational acceleration IG. The linen is lifted by a beater etc. fixed to the drum, and the linen is allowed to fall under its own weight from above the drum, while hot air is blown into the drum to dry the linen. For this reason, the efficiency of hot air usage is different from hot air that gives heat to the linen, loses its energy, lowers its temperature, and is discharged outside the drum, whereas hot air is often discharged outside the drum without applying heat to the linen. , which caused a decline in energy usage efficiency.

(Problems to be Solved by the Invention) The conventional drum dryer described above simply blows hot air into the linen floating in the rotating drum, so it takes a long time to dry the linen. Was. For example, 25 to 30 minutes were required to completely dry a towel.

Therefore, it has been desired to shorten the process.

In addition, the drying energy usage efficiency is usually 30-45%.
Generally, it is about 35%, which causes problems such as a lot of waste. Therefore, it has been desired to improve usage efficiency. This was because the hot air was applied to the linen while it was lifted and suspended in the air in the rotating drum, so the thermal energy of the hot air did not sufficiently act on the linen.

The present invention has been proposed to solve the above-mentioned conventional problems.

(Means for Solving the Problems) For this reason, the present invention provides a device for drying clothes etc. placed in a rotating drum, in which a heating jacket is fixed to the outer periphery of the rotating drum, and the centrifugal acceleration at the inner periphery of the drum is but,
It is designed to dry by operating at a rotational speed where the gravitational acceleration is 1G or more, and this is a means to solve the problem.

(Function) A heating jacket is fixed to the outer periphery of the rotating drum.The heating jacket increases the temperature of the outer periphery of the drum, and the linen is heated by contact with the outer periphery of the drum, and the centrifugal acceleration at the inner periphery of the drum is 1G or more than the gravitational acceleration. Operate at the rotation speed.

(Example) The present invention will be described below with reference to the embodiments shown in the drawings. Figs. It is rotatable while maintaining the rotation axis 3, and is driven by a transmission path consisting of a pulley 4 fixed to a rotating shaft 3, a drive belt 5, and a drive pulley 6 fixed to a motor 7. Further, the outer periphery of the drum has a corrugated shape, a heating pipe 1G is fixed to the concave portion thereof, and a hole 19 is bored in the convex portion. Reference numeral 2 denotes an outer body which has a cylindrical or polygonal shape and is placed outside the drum 1. A drum support 8 consisting of a bracket and bearings providing the drum rotation axis 3 is fixed to one side, and the drum support 8 is fixed to the other side. A blowing part 9 for supplying water, steam, heated air, etc. into the inside of the air conditioner 1 is fixed.

The driving pulley 6 is fixed to the motor 7 and transmits the rotational force of the motor to the drum rotating shaft 3 via the belt 5 and the pulley 4. Further, the motor 7 is a power source for driving the drum 1, and the rotation speed is set by a speed variable device 30. The drum support 8 is made up of a bracket and bearings, and supports the rotating shaft 3 of the drum.

The blowing part 9 is fixed to one side of the drum outer body 2, and feeds water, steam, heated air, etc. into the drum 1, and has a ring shape and has an opening 20 on the inner peripheral surface. Further, the drum 1 has a structure that prevents the supplied heating medium such as water, steam, heated air, etc. from leaking to the outside.

The heating pipe 1G is fixed to the outer circumferential portion of the drum 1, and heated steam or heated oil is fed into this pipe to heat the outer circumferential surface of the drum.

11 is a pipe for the heating medium feeder, and rotary seal 1
The heated steam or heated oil supplied through the rotary shaft 3 passes through the inside of the rotary shaft 3 and is supplied to the vibrator 11 . The structure is such that a heat medium is supplied from this pipe 11 to a heating pipe 1G fixed to the outer peripheral surface of the drum 1.

12 is a heating medium return pipe, and the heated steam or heated oil supplied into the heating pipe 1G heats the outer peripheral surface of the drum 1 and heats the linen in contact with this outer peripheral surface,
The heated steam becomes condensed water, and the temperature of the heated oil decreases. A pipe 12 for returning the condensed water or used oil is fixed in the space between the inner peripheral surface of the drum 1 and the beater 17. The rotary seal 13 is rotatably attached to the rotating shaft 3 in order to feed a heat medium for heating the outer peripheral surface of the drum 1 and return the used heat medium. Further, the rotary seal 13 is fixedly attached, and the heated steam or heated oil feed pipe 14,
A condensate or used oil return pipe 15 is installed.

14 is a heating pipe 1G fixed to the outer peripheral surface of the drum 1
A feed pipe for sending heated steam or heated oil to
16 opens when putting linen into the drum 1, washes it,
The door is closed during the dehydration and drying process, and the inner surface of the door is in close contact with the blowing part 9 of the outer body 2 of the drum, so that water, steam,
The structure is such that heated steam and the like do not leak to the outside of the outer shell 2. Reference numeral 17 denotes a beater composed of a plurality of chevron-shaped plates (Fig. 3) attached to the inner peripheral surface of the drum 1.
The rotation of the drum has the effect of lifting the linen upwards, and a heating medium feeding speed pipe 11 and a return vibrator 12 are attached to the space between the beater 17 and the inner peripheral surface of the drum.

A seal 18 is fixed to the drum outer shell 2 and has a structure that slides on the outer circumferential surface of the drum 1. The outer shell allows heated steam, heated air, etc. supplied from the blowing section 9 into the drum 1 to enter the drum 1. It has the role of preventing leakage to 2.

19 is a hole with a diameter of several dragons drilled on the outer circumferential surface of drum 1,
In the washing process, washing water, detergent, etc. enter and exit the drum 1 and the outer shell 2. Further, in the dewatering process, as the drum 1 is rotated at high speed, water shaken off from the linen is discharged into the outer shell through the holes. Furthermore, in the drying process, the heated air supplied into the drum 1 supplies energy into the drum 1 to dry the linen, and then this air is discharged from the hole 19 into the outer shell 2 and then discharged to the outside of the machine. Ru. Reference numeral 20 denotes an opening formed in the inner circumferential surface of the blowing section 9, through which heated steam, heated air, etc. are supplied into the drum 1. 21 is a water supply pipe that sends washing water into the drum 1; 22 is used to drain water from the drum outer body 2 during the washing process or during the dewatering process; whether or not the water is being drained is determined by opening and closing the damper 23; Control. Also, 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 transferred from the outer shell 2 to the drain pipe 2.
2 and is discharged to a drain 32 outside the machine. Furthermore, the damper 23 is closed when no water is being drained from the outer shell 2.

24 is a heater, when supplying heated air into the drum 1,
The air in the room is heated by the same heater 24 and sent by a blower or the like (not shown). This heater generally exchanges heat between steam or heating oil and room air. Reference numeral 25 denotes a duct for sending air heated by the heater 24 or heated steam supplied from a pipe (not shown) into the drum 1, and the air or steam is guided into the blowing section 9 through the duct, and is guided through the opening. 20 into the drum 1. Reference numeral 26 is an exhaust port provided in a part of the outer shell 2 of the drum for discharging the air inside the outer shell 2 to the outside of the machine. 27 is a lint filter, and the air exhausted from the drum 1 contains a large amount of linen lint.

Therefore, by passing the air discharged through the exhaust port 26 through the lint filter 27, the lint contained in the exhaust air is captured.

28 is an exhaust duct for discharging the exhaust gas from which lint has been removed through the lint filter 27 to the outside of the machine. The speed variable device 30 is a device for adjusting the rotational speed of the motor 7, and controls the drum 1 to be rotated at an optimal speed in each of the washing process, dehydration process, and drying process.

31 is a vibration isolator, and the drum 1, outer shell 2, etc. are suspended on the vibration isolator.

Next, the operation of the embodiment configured as above will be explained. First, to explain about washing, a certain amount of water is supplied into the drum 1 and the outer shell 2 from the water supply pipe 21. Since holes 19 are open on the outer peripheral surface of the drum 1, water supplied into the drum 1 passes through the holes 19 and accumulates in the outer shell 2, and the water level inside the drum 1 gradually rises. Then, the water level is checked with a water level detection device (not shown), and the water supply is stopped when the water level reaches a certain level. Next, the door 16 is opened and linen is manually fed into the drum 1. Note that the linen may be supplied automatically using a conveyor or the like, or the linen may be fed into the drum 1 after being put into the drum 1, or the linen may be fed into the drum 1 while water is being fed.

Next, the motor 7 is driven to rotate the drum 1 at a constant rotation. Repeated rotation of the drum 1 in forward and reverse directions is effective in preventing linen from tangling. Further, detergent and auxiliary agents are supplied into the drum l from a detergent and auxiliary agent supply device (not shown) to perform pre-washing.

When the pre-washing is completed, the damper 23 is opened and the washing water used for the pre-washing is discharged into the drain groove 32 through the drain pipe 22, and a sensor (not shown) detects after a certain period of time or when the pre-washing water has been drained. and close the damper 23.

Next, in the same way, wash water is supplied into drum 1 up to a certain water level,
Further, detergent and auxiliary agents are supplied into the drum 1 from a detergent and auxiliary agent supply device (not shown). Here, heated steam or heated oil is sent from the feed pipe 14 into the heating pipe IO fixed to the outer peripheral surface of the drum 1. Drum 1 is motor 7
Since the heating pipe 1G is immersed in the supplied water, the temperature of the washing water can be increased. When the temperature of washing water exceeds a certain value, the supply of heated steam or heated oil is automatically stopped. In addition, if the amount of washing water is large and it takes time to heat up the washing water with only the amount of heat supplied from the feed pipe 14, steam may be blown directly into the water in the outer shell 2, or the outer shell 2 may be covered with a steam jacket, etc. Indirect heating may also be used.

The rotation speed of the drum 1 can be varied by controlling the speed variable device 30 to vary the rotation speed of the motor 7.

In addition, when the laundry is lifted above the drum 1 by the beak 17 and dropped, the mechanical force caused by the impact with the water surface, and furthermore, the drum 1 is vibrated by a vibration device (not shown), and the relative speed between the linen and the washing water is increased. By forcibly increasing the washing time, the washing time can be shortened. In this way, main washing is performed in warm water, and then the drum 1 is rotated at a medium speed to shake off the washing water adhering to the linen by centrifugal force. At this time, naturally, the damper 23 is opened to drain the washing water from the drain pipe 22 to the outside of the machine.

Thereafter, the damper 23 is closed and water is supplied into the drum 1 again to perform a rinsing process. This rinsing step may be similar to the washing step. Once the rinsing process, which involves repeated supply and drainage of washing water, is completed, the next step is the dehydration process.

Next, to explain the dewatering process, the drum 1 is controlled by the speed variable device 30 to have a speed of 1 to 1.5 on the inner circumference of the drum.
It is operated by rotating under the acceleration of G. Thereby, 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, and the water adhering to the linen is discharged to the outside from the hole 19 of the drum 1 due to centrifugal force. is discharged to.

Further, at the same time as the dehydration process begins, or during the rinsing process, heated steam or heated oil is supplied to the heating pipe 1G fixed to the outer periphery of the drum 1 to raise the outer circumferential temperature of the drum 1. The linen is heated by contacting the inner peripheral surface of the drum 1. On the other hand, steam is supplied through the duct 25 from a pipe (not shown). The supplied steam passes through the blowing section 9 and is blown onto the linen in the drum 1 from the opening 20, increasing the temperature of the linen. The supply of heated steam is stopped in the middle of the dehydration process, and instead of this, heated air is similarly supplied to the linen in the drum 1. This results in drum 1
The temperature of the linen inside gradually rises to 70-80°C.

Since the surface tension of water decreases as the water temperature rises, the dehydration effect in centrifugal dehydration can be increased by about 20%. It is effective to replace the inner and outer layers of linen in the drum 1 during centrifugal dewatering, that is, to lower the rotational speed once to 1 to 1.5G and rotate at true speed again to obtain a uniform dewatering effect. .

Next, drying will be explained. Here, the rotational speed of the drum will be expressed in terms of gravitational acceleration G.

Here, R is the radius of the drum (m), and n is the number of rotations (rpm) of the drum. Rotation speed less than 1G, preferably 0
．． When the linen is lifted upward by the beater 17 fixed to the drum 1 with a force of 7 to 0.8G and allowed to fall under its own weight, the linen is pressed against the drum by the centrifugal force because its own weight is slightly greater than the force of the drum. It becomes floating inside. Air heated by the heater 24 is supplied into the drum 1 from the opening 20 of the blowing section 9 through the duct 25. Next, the rotation speed of the drum is set to 16 or more, for example, 1 GG, and the linen is pressed against the outer periphery of the drum by centrifugal force to heat the linen by contact. These are combined as shown in Figure 6 and dried. Since contact heating is much more efficient in drying linen than convection heating using hot air, the rotational speed of the drum is changed as shown in Figure 6. By contacting and heating, drying efficiency can be improved. This also contributes to shortening the drying process.

According to test results, the energy usage efficiency in contact heating is about 60 to 70%, which is significantly higher than the 35% efficiency in convection heating using hot air.

Also, during the drying process, steam or heating oil for heating the outer periphery of the drum is supplied from the feed tube 14 to the rotary seal 13.
It is sent into the heating pipe 1G through the heating pipe 1G, and continues to heat the outer circumferential surface of the drum 1. If the temperature of the outer circumferential surface of the drum 1 becomes too high and causes damage to the linen, the temperature of the outer circumferential surface of the drum 1 is measured with a thermometer (not shown), and the temperature of the heated steam or heated oil to be supplied is automatically adjusted. adjust.

In the embodiments described above, a combination of a contact heating method using a heating jacket fixed to the outer periphery of the rotating drum and a hot air drying method in which hot air is blown into the drum from an opening has been described. The blowing part 9 and the opening part 20 may be deleted and only the former may be used.

In addition to contact heating using a heating jacket fixed to the outer periphery of the rotating drum, pressurized hot air is blown from the opening inside the drum while the linen is being contact-heated by centrifugal force, and the linen is being heated in contact with the drum. By performing ventilation drying by passing hot air through, the drying efficiency can be improved to about 70%. Note that hot air for ventilation drying may be sent into the drum using a blower or the like. The outer circumferential portion of the drum may be made to have a negative pressure so that the pressure difference between the inside of the drum and the outside of the drum causes the flow from the inside to the outside of the drum. Furthermore, the same effect can be obtained even if the hot air for ventilation drying is sent from the outer periphery of the drum toward the inside in the same manner as described above.

In addition, in the above embodiment, the case of washing with water was explained, but
It is also applicable to dry cleaning machines that use organic solvents such as perchlorethylene. Alternatively, far infrared rays can be generated by attaching ceramics to the inner periphery of the rotating drum, or by coating the inside of the drum with ceramics and heating it with a heating jacket fixed to the outer periphery of the drum, which can be used as drying energy. good. In this case, it is effective to shorten the drying time.

Further, in the above case, a method has been described in which the outer peripheral surface of the drum is heated by a drum jacket fixed to the drum, but the same effect can be obtained by heating the outer peripheral surface of the drum by another means.

In addition, the present invention continuously performs each process of washing, dehydration, and drying in one step.
In addition to the above-mentioned embodiment in which the process is carried out using a stand-up machine, it is also applicable to a drum-type dryer that functions only as a dryer.

(Effects of the Invention) Since the present invention is configured as explained in detail above,
By combining linen drying with contact heating with a heated drum and heating with hot air while the linen is suspended in the drum, drying time can be shortened from about 25 minutes to about 15 minutes. I can do it. Furthermore, by combining contact heating and hot air heating, the efficiency of energy use required for drying can be improved from about 35% to about 55%, which can greatly contribute to energy saving. Furthermore, by combining contact heating and ventilation heating,
Energy usage efficiency can be improved to approximately 70%.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of a drum dryer showing an embodiment of the present invention, Figure 2 is an enlarged view of section A in Figure 1, and Figure 3 is B in Figure 2.
-B cross-sectional view, Figure 4 is a view taken in the direction of arrow C in Figure 2, Figure 5 is a cross-sectional view of Figure 1.
Figure 6 is a front view of the dryer shown in Figure 6, showing the number of rotations of the rotating drum and the change in the pattern of gravitational acceleration proportional to the square of the number of rotations.
It is an explanatory diagram showing an example. Explanation of main parts of the figure 1 Rotating drum 2 - Drum outer body 10 - Heating vibrator 11 - Heating medium feed speed pipe 12 - Heating medium return pipe 13 - Rotary seal 19 - Hole 24 -11-Heater 25/-Duct Patent Applicant: Mitsubishi Heavy Industries, Ltd. Figure 1

Claims (1)

[Claims] In a device that dries clothes, etc. placed in a rotating drum, a heating jacket is fixed to the outer periphery of the rotating drum, and the drum is operated at a rotation speed such that the centrifugal acceleration at the inner periphery is 1 G or more than the gravitational acceleration. A drum dryer characterized by: