JP2021016513A - Heating unit of rotary drum type dryer - Google Patents

Abstract

To provide a heating unit of rotary drum type dryer capable of supplying warm air efficiently into a rotary drum by being mounted on a back surface side of the rotary drum.SOLUTION: A heating unit of rotary drum type dryer includes: a drying treatment chamber at least including an opening/closing door, a lateral and cylindrical rotary drum for storing an object to be treated and a shell for storing the rotary drum; an exhaust chamber provided on a lower side of a drying treatment chamber and including a lint filter; and a rotary drive mechanism provided on a back surface of the drying treatment chamber, and for rotationally driving the rotary drum. The heating unit includes a gas burner unit, and a duct part provided on an upper side of the gas burner unit, and for guiding the warm air from the gas burner to the rotary drum, and it is provided on the back surface of the drying treatment chamber and on a lateral side of the rotary drive mechanism.SELECTED DRAWING: Figure 8

Description

The present invention relates to a heating unit of a rotary drum dryer such as a rotary drum dryer suitable for installation and use in facilities such as a coin laundry, a dormitory, a hospital, and a nursing home, and a dryer used in a cleaning shop. ..

When cleaning an object to be treated such as clothes, after washing the dirt on the object to be treated completely, the wet object to be treated is forcibly dried with warm air using a drying device without natural drying. , It is known to improve the bactericidal effect.

In this type of drying device, for example, a drying processing chamber partitioned by a shell is formed in a housing, and a rotating drum having a vent in a horizontal state is rotatably provided in the drying processing chamber. A heating unit is provided in the flow path on the upstream side of the hot air inlet provided in the upper part of the drying processing chamber. In addition, a lint filter and a blower (electric fan) are installed in the exhaust flow path connected to the hot air outlet connected to the drying treatment room, and the air in the drying treatment room is exhausted from the exhaust flow path to the outside by the blower, and at the same time, it is generated by the heating unit. The warm air is sucked into the drying chamber from the hot air inlet, and the object to be processed (also referred to as the object to be dried) in the drum is dried by this warm air.

Then, the temperature of the hot air at the hot air inlet is detected by the inlet side temperature sensor, and the gas burner of the heating unit is turned on / off according to the temperature detected from the inlet side temperature sensor, that is, ignition or extinguishing is performed. The temperature in the drying treatment chamber was adjusted by repeating the process (for example, Patent Document 1). The heating unit is designed not only in the upper part of the drying processing chamber but also in a structure provided on the side surface of the rotating drum and a structure provided on the lower side of the rotating drum (for example, Patent Documents 2 and 3).

In the conventional rotary drum type dryer, since the heating unit is provided on the upper part, the side portion, or the lower part of the rotary drum, the hot air supply path between the heating unit and the rotary drum is formed long. Therefore, the warm air from the heating unit cannot be efficiently supplied into the rotating drum. At the same time, it was difficult to visually confirm the ignition of the gas burner in the heating unit, and the maintenance work of the heating unit could not be performed smoothly.

JP-A-2007-260196 Japanese Unexamined Patent Publication No. 2000-271395 JP-A-2019-37590

An object to be solved by the present invention is to provide a heating unit of a rotary drum type dryer which is attached to the back side of the rotary drum and can efficiently supply warm air into the rotary drum.

The heating unit of the rotary drum type dryer of the embodiment includes a drying processing chamber having at least an opening / closing door, a lateral cylindrical rotary drum for accommodating an object to be processed, and a shell for accommodating the rotary drum. A heating unit of a rotary drum type dryer including an exhaust chamber provided on the lower side of the drying treatment chamber and a rotary drive mechanism provided on the back surface of the drying treatment chamber to rotationally drive the rotary drum. The heating unit includes a gas burner unit and a duct portion provided above the gas burner unit and guides warm air from the gas burner to the rotating drum, and is provided on the back surface of the drying processing chamber and said. It is provided on the side of the rotation drive mechanism.

A perspective view and a front view of the rotary drum type dryer according to the embodiment. A perspective view in which the opening / closing door of the drying treatment chamber and the cover of the operation panel and the exhaust chamber are removed according to the embodiment, and a perspective view seen from the back of the drying treatment chamber and the exhaust chamber. (A) is a rear view showing a connection structure between a rotating shaft and a rotating drum according to an embodiment, and (b) is a side view of (a). (A) is a side view of the back plate of the rotating drum according to the embodiment, and (b) is a view of the back plate viewed from the back, showing a hot air intake port from the heating unit. (A) is a top view of the rotary drum according to the embodiment, and (b) is a diagram showing the shape of the ventilation holes formed on the inner peripheral surface of the rotary drum and the second region. The figure which shows the attachment structure of the felt attached to the outer peripheral end of the rotary drum which concerns on embodiment. (A) and (b) are a perspective view and a front view of the heating unit according to the embodiment. Exploded view of the heating unit according to the embodiment. (A) and (b) are a side view of the heating unit according to the embodiment and a sectional view thereof AA. The figure which shows the flow direction of the warm air in the heating unit which concerns on embodiment. The figure which shows the flow of the dry air of the rotary drum type dryer which concerns on embodiment. The figure which shows the replacement of the lint filter of the exhaust chamber which concerns on embodiment. The figure which shows the structure of the control device of the rotary drum type dryer which concerns on embodiment. The flowchart which shows the processing of the control apparatus in the drying process which concerns on embodiment. The flowchart which shows the process of the fan variable speed control in the drying process which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B show a rotary drum type dryer according to an embodiment of the present invention, FIG. 1A shows a perspective view of the rotary drum type dryer 100, and FIG. 1B shows a front view thereof. The housing of the rotary drum type dryer 100 is composed of an operation panel unit 110, a drying processing chamber 120, and an exhaust chamber 130. An opening / closing door 122 that is rotated by a hinge mechanism 124 is attached to the front surface of the drying processing chamber 120 in order to take in and out the object to be processed. The drying processing chamber 120 includes at least a rotating drum for accommodating the object to be processed and a shell for accommodating the rotating drum. The exhaust chamber 130 is provided below the drying processing chamber 120 and includes a lint filter that captures and collects lint in the exhaust gas emitted from the rotating drum.

A CPU board (not shown) is mounted in the operation panel unit 110. A CPU and an operation system circuit are mounted on the CPU board. A switch 112 for fresh blow is provided on the panel portion of the operation panel portion 110. When the customer using the rotary drum type dryer 100 presses the switch 112 before inserting the clothes or the like into the drying processing chamber 120, idle operation is executed for, for example, 15 seconds, and ventilation and cleaning in the drying processing chamber 120 are performed. Will be done. By this operation, the drying processing chamber 120 is kept clean, and the customer can use the rotary drum type dryer 100 with peace of mind. Further, the panel unit of the operation panel unit 110 is provided with a "drying time" display unit that can be used for 100 yen. The "drying time" can be set by remote operation by a centralized settlement machine (not shown) provided near the rotary drum type dryer 100. The time can be easily set (changed) according to the service date of the coin laundry or the laundry, and the service can be provided smoothly.

FIG. 2A shows a perspective view in which the opening / closing door 122 of the drying processing chamber 120 and the covers of the operation panel portion 110 and the exhaust chamber 130 are removed. A laterally-oriented cylindrical rotating drum 200 is rotatably mounted in the drying processing chamber 120. The rotary drum 200 has an open side (also referred to as an opening / closing door side) into which an object to be processed is inserted and a rotary shaft side to which a rotary drive shaft is attached. On the outside of the rotating drum 200, a lateral cylindrical shell (outer body) 205 is provided so as to surround the outer periphery of the drum with a gap between the rotating drum 200 and the outer peripheral surface of the rotating drum 200. Inside the rotating drum 200, a hat 210 is provided to lift wet clothes or the like (object to be processed) to be dried upward from the lower surface of the rotating drum 200. The hat 210 is provided in the depth direction (cylindrical direction) at three or four positions on the circumference at equal intervals according to the size of the rotating drum 200. A lint filter 400 is provided on the upper surface of the exhaust chamber 130 so as to be replaceable in a drawer type. The lint filter 400 is a filter that captures and recovers lint in the exhaust gas emitted from the rotating drum 200.

FIG. 2B is a perspective view showing the back surface of the drying processing chamber 120 and the back surface of the exhaust chamber 130. A rotating shaft 215 of the rotating drum 200 and a pulley 220 fixedly connected to the rotating shaft 215 are attached to substantially the center of the back surface of the drying processing chamber 120. The rotating shaft 215 is rotatably fixedly connected to the back wall portion 217. The pulley 220 is frictionally connected to the pulley 225 of the rotary drum motor (reference numeral 545 in FIG. 13) by the V-belt 230, and the pulley 220 rotates via the V-belt 230 according to the rotation of the pulley 225 to rotate the rotary drum. Rotate 200. A sirocco fan type exhaust fan (blower) 235 is provided on the back surface of the exhaust chamber 130, and the air guided to the exhaust chamber 130 by the rotation of the exhaust fan 235 is exhausted to the outside from the exhaust duct 240.

Further, a heating unit 245 is provided on the right side of the pulley 220 on the back surface of the drying processing chamber 120 (between the rotation drive mechanism described later and the right side plate). Details of the heating unit 245 will be described later. Here, the heating unit 245 is provided on the right side of the pulley 220, but it may be provided on the left side of the pulley 220. By arranging the heating unit 245 on the back surface of the drying treatment chamber 120, the height of the drying treatment chamber 120 can be designed to be low, and from the heating unit 245 to the hot air inlet of the rotary drum 200 in the drying treatment chamber 120. Since the distance can be designed to be short, it leads to cost reduction of products and improvement of drying efficiency. The rotary drive mechanism of the rotary drum motor, pulley 220, 225, and V-belt 230 is provided on the back surface of the drying processing chamber 120, regardless of the structure for rotationally driving the rotary drum 200. good.

Further, an air volume sensor (flow valve) 535 that operates ON / OFF is provided on the lower left side of the back surface of the drying processing chamber 120. When the air volume sensor 535 is attached, it is preferable to fix the air volume sensor 535 with tape or the like so as not to flutter, and to provide a protective sheet between the tape and the air volume sensor 535. Further, an outlet side temperature sensor 530 is provided near the lower left side of the exhaust fan 235 of the exhaust chamber 130. The functions of the air volume sensor 535 and the outlet side temperature sensor 530 will be described later.

Next, the configuration of the rotary drum 200 will be described with reference to FIGS. 3 to 6. FIG. 3A is a rear view showing a connection structure between the rotating shaft 215 and the rotating drum 200, and FIG. 3B is a side view of FIG. 3A. FIG. 4 (a) is a side view of the back plate of the rotating drum according to the embodiment, and FIG. 4 (b) is a view of the back plate as viewed from behind, showing a hot air intake port (opening) from the heating unit. It is a figure which shows. FIG. 5A is a top view of the rotary drum 200, and FIG. 5B is a diagram showing the shape of the ventilation holes formed on the opening / closing door side of the rotary drum 200. FIG. 6 is a diagram showing a mounting structure of felt mounted on the outer peripheral end of the rotating drum 200.

In FIGS. 3A and 3B, the laterally oriented cylindrical rotating drum 200 is surrounded by the shell 205 except for the opening / closing door side. A rotating shaft 215 penetrates the back plate 205a of the shell 205 as viewed from the opening / closing door side, and a circular mounting plate 255 is fixedly connected to the tip 250 of the rotating shaft by welding or the like. One end of the rectangular connecting metal plates 260a to 260d is fixedly connected to the circular mounting plate 255 by welding or the like. Further, the other ends of the rectangular connecting metal plates 260a to 260d are fixedly connected to the outer peripheral surface 200a of the rotating drum 200 facing the back plate 205a of the shell 205 by screws or the like. That is, the rectangular connecting metal plates 260a to 260d constitute a fixing member radially from the rotation axis. As a result, a mechanism is formed in which the rotating shaft 215 is rotated by the rotation of the pulley 220, and the rotating drum 200 is further rotated. The inner peripheral surface 200b inside the back outer peripheral surface 200a of the rotating drum 200 as seen from the opening / closing door side projects toward the opening / closing door side as compared with the outer peripheral surface 200a. That is, the gap formed by the back plate 205a of the shell 205 and the inner peripheral surface 200b of the rotating drum 200 (including a part of the gap between the back plate 205a and the outer peripheral surface 200a) is the warm air blown from the heating unit 245. It becomes a passing path (blower path). In FIG. 3, the inner peripheral surface 200b has a shape protruding toward the opening / closing door side, but the back plate 205a may have a shape protruding toward the rotation shaft side.

FIG. 4 (a) is a side view of the back plate of the rotating drum according to the embodiment, and FIG. 4 (b) is a view of the back plate as viewed from behind, showing a hot air intake port (opening) from the heating unit. It is a figure which shows. FIG. 4 also shows the shapes of the outer peripheral surface 200a of the back plate of the rotating drum 200 and the inner peripheral surface 200b inside the outer peripheral surface 200a. As shown in FIG. 4B, warm air 270 blown from the heating unit 245 is applied to the inner inner peripheral surface 200b centered on the rotation axis, such as wet clothes to be dried in the rotation drum 200 ( A large number of ventilation holes (or through holes, also referred to as perforations) 265 through which warm air passes toward the object to be processed) are formed. The large number of ventilation holes 265 are holes punched on the rotation shaft side by press working, and holes are formed in a grid pattern for each area in which the inner peripheral surface 200b is divided into four equal parts, and dowels are not provided. During press working, make sure that there are no burrs or scratches on the surface, and if burrs are found, remove the burrs. The optimum size of the ventilation holes 265 is about 7 mm. The opening 275 of the shell 205 shown in FIG. 4B is an intake port for warm air 270 blown from the heating unit 245. The warm air 270 taken in from the opening 275 further flows to the inner peripheral surface 200b provided with a step like the warm air 270a to 270b, and is blown toward the ventilation holes 265 in almost the entire area of the inner peripheral surface 200b. ..

As shown in FIG. 4A, the diameter of the inner inner peripheral surface 200b is preferably 50% or more to 80% or less of the diameter of the rotating drum 200. For example, in the case of a large-capacity type in which the diameter of the rotating drum 200 is about 900 mm, the diameter of the inner inner peripheral surface 200b is optimally about 570 mm. Further, even in the small capacity type in which the diameter of the rotating drum 200 is about 760 mm, the diameter of the inner inner peripheral surface 200b is optimally about 570 mm. Further, as shown in FIG. 4A, the gap Sa formed by the back plate 205a of the shell 205 and the inner peripheral surface 200b of the rotating drum 200 is preferably about 40 to 60 mm (optimally 50 mm). Further, the step width Ds between the back outer peripheral surface 200a and the inner peripheral surface 200b thereof is preferably about 20 to 40 mm (30 mm is optimal).

As described above, according to the embodiment, the back plate of the rotating drum 200 is composed of an inner peripheral surface 200b in which a large number of ventilation holes through which warm air passes are formed, and an outer peripheral surface 200a on the outer side of the inner peripheral surface 200b. The inner peripheral surface 200b has a feature of protruding (having a step) toward the opening / closing door side. As a result, warm air can be blown from the ventilation holes 265 in almost the entire region of the inner peripheral surface 200b of the rotary drum 200 toward the object to be processed in the rotary drum 200. The size of the inner peripheral surface 200b of the rotating drum 200 is preferably 25% or more to 65% or less of the total area of the back plate. The outer peripheral surface 200a secures a region for fixing the rectangular connecting metal plates 260a to 260d and a region for fixing the hat 210.

FIG. 5A shows a top view of only the rotating drum 200. As shown in FIG. 5A, the lateral side plate of the rotating drum 200 has a first region 200c on the rotating shaft (rear surface) side and a second region 200d on the opening / closing door side, and has a second region 200d. A large number of ventilation holes 280 through which air (warm air) passes are formed only in the air. That is, the warm air blown from the ventilation holes 265 in almost the entire region of the inner peripheral surface 200b of the rotary drum 200 toward the object to be processed in the rotary drum is blown to the first region 200c without loss. On the other hand, the second region 200d on the opening / closing door side of the rotary drum 200 is an exhaust region in which the air in the rotary drum 200 is exhausted. An exhaust port 290 connecting the drying processing chamber 120 and the exhaust chamber 130 is formed below the second region (exhaust region) 200d on the opening / closing door side of the rotary drum 200. Therefore, the air (warm air whose temperature has dropped) after being blown from the ventilation holes 265 in almost the entire region of the inner peripheral surface 200b of the rotary drum 200 toward the object to be processed in the rotary drum is the first of the rotary drum 200. It passes through the ventilation hole 280 of the second region (exhaust region) 200d through the region 200c, passes through the exhaust port 290 connected to the drying processing chamber 120 and the exhaust chamber 130, and is exhausted (sucked) to the exhaust chamber 130.

FIG. 5B is a diagram showing a detailed shape of the ventilation hole 280 formed in the second region (exhaust region) 200d of the rotary drum 200. As shown in FIG. 5B, the ventilation holes 280 are arranged vertically and horizontally in a staggered manner. The optimum diameter of the ventilation hole 280 is about 8 mm. In addition, the optimum lateral spacing Za (between the centers of the staggered holes) of one vent and the adjacent vents is about 9.2 mm, and the vertical spacing Zb (between the centers of the same row) is also the same. The optimum size is about 12 mm. Further, as shown in the cross-sectional view taken along the line AA, a dowel 280a is formed in the ventilation hole 280 toward the outside. The optimum length of the dowel 280a (in the depth direction) is about 2.5 mm. By forming the dowel 280a, the strength of the second region (exhaust region) 200d of the rotating drum 200 can be secured. That is, during the drying operation, the object to be processed is put into the second region (exhaust region) 200d and rotates. Therefore, when the ventilation hole 280 is merely a through hole, the strength is weakened. On the other hand, in the present embodiment, the strength of the second region (exhaust region) 200d can be increased by forming the dowel 280a.

FIG. 6 is a diagram showing a mounting structure of felt 295 mounted on the outer peripheral end of the rotary drum 200. A gap for rotation is required between the back plate 205a of the shell 205 shown in FIG. 3B and the outer peripheral end of the rotating drum 200 facing the back plate 205a. Felt 295 is provided in a circular shape at all the outer peripheral ends of the rotating drum 200 so as to close this gap. The felt 295 is fixedly connected to the outer peripheral end of the rotating drum 200 by a circular gold plate 298 with rivets or the like. By attaching the felt 295 in this way, it is possible to prevent the warm air in the rotating drum 200 from leaking from the gap formed between the back plate 205a of the shell 205 and the outer peripheral end of the rotating drum 200 facing the shell 205. ..

Next, the configuration of the heating unit mounted beside the rotation drive mechanism will be described with reference to FIGS. 7 to 10. 7 (a) and 7 (b) show a perspective view and a front view of the heating unit 245. FIG. 8 shows an exploded view of the heating unit 245. 9 (a) and 9 (b) show a side view of the heating unit 245 and a cross-sectional view taken along the line AA. FIG. 10 shows the flow direction of warm air in the heating unit 245.

As shown in FIGS. 7A and 7B, the heating unit 245 has the shape of a vertically long cube with an open bottom surface. A gas plug 300 is attached to the bottom surface of the heating unit 245. Further, on the lower side of the front surface, a peep hole 305 for checking the ignition status of the gas burner provided inside is provided.

FIG. 8 shows an exploded view of the heating unit 245 shown in FIG. When the front plate 310 of the heating unit 245 is removed, the burner unit 315 is provided from the lower side to the central portion of the inside, and the duct portion 317 is provided on the upper side of the burner unit 315. The burner unit 315 has a cubic shape, and the hot air outlet 320 on the upper surface thereof forms a narrow hot air outlet by the inclined plate 325. That is, the burner unit 315 has a shape in which the opening area is small toward the upper side. The size of the warm air outlet 320 formed by the inclined plate 325 is preferably about 3/5 to 1/2 of the bottom surface. As a result, the air warmed by the burner unit 315 can be vigorously blown from the warm air outlet 320.

9 (a) and 9 (b) show a side view of the heating unit 245 and a cross-sectional view taken along the line AA. The duct portion 317 above the burner unit 315 is provided with a horizontal plate 330, a vertical plate 335, an inclined plate 340 for mounting the horizontal plate 330 and the vertical plate 335, and a heating unit air outlet 345. The inclined plate 340 is attached to the rear upper surface of the burner unit 315. Further, an inlet side temperature sensor (thermistor) 525 is provided at a position slightly away from the warm air outlet 320 near the horizontal plate 330. The function of the inlet temperature sensor (thermistor) 525 will be described during operation.

FIG. 10 shows the flow direction of warm air in the heating unit 245. The air warmed by the gas burner 350 in the burner unit 315 is blown from the warm air outlet 320, hits the horizontal plate 330 of the duct portion 317, and is pushed back in the forward direction. Then, the warm air mixed with the outside air taken in from the gaps (gap on both sides and the front side) formed between the heating unit 245 and the burner unit 315 hits the vertical plate 335 and rises, and from the heating unit blower port 345 to the rotating drum 200. Air is blown toward the opening 275 of the side shell 205.

FIG. 11 shows the flow of dry air in the rotary drum type dryer 100. As shown in FIG. 11, the air warmed by the gas burner 350 of the heating unit 245 passes through almost the entire region of the inner peripheral surface 200b provided with the step of the rotating drum 200 from the opening 275 shown in FIG. 4A. It passes through the pores 265 and is sprayed toward the object to be processed (object to be dried) in the rotary drum 200. On the other hand, the air exhausted to the exhaust chamber 130 is sucked by the rotation of the sirocco fan type exhaust fan 235 provided on the back surface of the exhaust chamber 130. As a result, the air blown out toward the object to be processed (object to be dried) in the rotary drum 200 is exhausted (sucked) from the exhaust port 290 shown in FIG. 5A into the exhaust chamber 130. A lint filter 400 is provided on the upper surface of the exhaust chamber 130, and lint and the like contained in the exhausted air are removed, sucked into the exhaust fan 235, and exhausted to the outside from the exhaust duct 240.

FIG. 12 is a diagram showing replacement of the lint filter 400 in the exhaust chamber 130. Lint and the like contained in the exhausted air are deposited on the lint filter 400 provided on the upper surface of the exhaust chamber 130. Therefore, it is necessary to replace the lint filter 400 periodically. Therefore, the front lid 130a of the exhaust chamber 130 can be opened, and the lint filter 400 provided on the upper surface thereof can be pulled out and replaced with a new filter.

FIG. 13 is a diagram showing a configuration of a control device 500 of the rotary drum type dryer 100. The control device 500 is mounted on a CPU board housed in the operation panel unit 110 of FIG. The control device 500 is composed of a microcomputer including a CPU 505, a ROM 510, a RAM 515, and the like. The control device 500 safely and efficiently controls the drying process based on the operation course set by the operation panel unit 110 of FIG. The CPU 505 receives detection signals from the inlet side temperature sensor 525, the outlet side temperature sensor 530 (see FIG. 2), and the air volume sensor 535 (see FIG. 2) via the input interface 520. Then, the exhaust fan 235 is driven, the motor 545 of the rotating drum 200 is driven, and the heating unit 245 is controlled via the output interface 540.

A program for performing a drying step based on signals from each sensor or the like is written in the ROM 510. The CPU 505 compares and detects the inlet side temperature detecting means that detects the inlet side temperature by the signal from the inlet side temperature sensor 525, the detection temperature detected by the inlet side temperature detecting means, and the preset control reference temperature. When the temperature is higher than the upper limit of the control reference temperature, a signal to increase the rotation frequency of the exhaust fan 235 is sent, and when the detection temperature is lower than the lower limit of the control reference temperature, the rotation frequency of the exhaust fan 235 is decreased. A fan control means for transmitting a signal to be caused and an outlet side temperature detecting means for detecting the outlet side temperature by the outlet side temperature sensor 530 are provided as a program module. Then, in the drying step, the gas burner 350 of the heating unit 245 is continuously burned while controlling the rotation frequency of the exhaust fan 235 by the inlet side temperature sensor 525 to dry the object to be dried.

FIG. 14 is a flowchart illustrating a processing flow of the control device 500. First, the control device 500 operates the exhaust fan 235 provided on the back surface of the exhaust chamber 130 (step S10). In the present embodiment, the rotation speed of the exhaust fan 235 can be set in four stages (low speed, medium speed, medium high speed, high speed), and the initial rotation speed is set to medium speed.

When the exhaust fan 235 is operated at a medium speed, a negative pressure is generated in the exhaust duct 240, whereby the air in the drying processing chamber 120 is sucked out from the exhaust port 290 (see FIG. 5) and flows into the exhaust chamber 130. Then, filtration (removal of lint and cotton debris) is performed by the lint filter 400 on the way. The filtered air is exhausted from the exhaust duct 240 through the exhaust fan 235 provided on the back surface of the exhaust chamber 130. At this point, the gas burner 350 of the heating unit 245 is not ignited.

If the operation is started at the medium speed of the exhaust fan 235, the control device 500 monitors the air volume sensor 535 (step S20). Then, it is determined whether or not the air volume sensor 535 is turned on (step S30). If it is determined in step S30 that the air volume sensor 535 is not ON (No), the control device 500 is predetermined from the start of operation of the exhaust fan 235 or from the time when the rotation speed of the exhaust fan 235 is changed. It is determined whether or not the determined air volume determination time has elapsed (step S40). This air volume determination time is set to, for example, 15 seconds in the first determination after the start of operation of the exhaust fan 235, and 5 seconds in the determination from the time when the rotation speed of the exhaust fan 235 is changed. If it is determined in step S40 that the air volume determination time has not elapsed (No), the control device 500 returns to step S20 and continues to monitor ON / OFF of the air volume sensor 535.

On the other hand, in step S40, when the control device 500 determines that the air volume determination time has elapsed (Yes), that is, 15 seconds have elapsed from the start of operation of the exhaust fan 235, or the rotation of the previous exhaust fan 235. When it is determined that 5 seconds have passed since the number was changed, it is determined whether or not the current rotation speed of the exhaust fan 235 is high (step S50). If it is determined in step S50 that the current rotation speed is high (Yes), the gas burner 350 is not ignited because the air volume is not sufficiently obtained even after the rotation speed is set to high speed. Then, an error process (step S60) such as notifying the user that the air volume is insufficient is performed, and the drying step is completed.

On the other hand, if it is determined in step S50 that the current rotation speed has not reached the high speed (No), the control device 500 increases the rotation speed of the exhaust fan 235 by one step, for example, from medium speed to medium high speed ( Step S70), the process returns to step S20, and the subsequent processing is performed.

When it is determined in step S30 that the air volume sensor 535 is turned on (Yes), the control device 500 ignites the gas burner 350 of the heating unit 245 (step S70). At this time, since the air volume required for combustion is secured in advance, the gas burner 350 can be smoothly ignited without incomplete combustion. In this way, the warm air heated by the heating unit 245 is guided from the opening 275 (see FIG. 4) into the rotating drum 10 through the ventilation hole of the inner peripheral surface 200b of the rotating drum 200. In the drying process, the rotating drum 200 is rotated in one direction at a predetermined rotation speed to stir the object to be processed, and the object to be processed is exposed to the warm air introduced into the rotating drum 200 (by blowing warm air). Drying operation is performed.

When the gas burner 350 is ignited, the control device 500 controls the temperature on the first inlet side (step S80). In this first inlet side temperature control, on / off control of the gas burner 350 is performed so as to keep the warm air within a predetermined control reference temperature while maintaining the rotation speed of the exhaust fan 235 at a medium speed. Do.

Specifically, the control device 500 monitors the inlet side temperature sensor 525, and the detection temperature T of the inlet side temperature sensor 525 is the upper limit value of the first control reference temperature (first upper limit temperature Tmx1 (for example, 165 ° C.)). If the temperature exceeds the above, the combustion of the gas burner 350 is stopped. When the detection temperature T falls below the lower limit of the first control reference temperature (first lower limit temperature Tmn1 (for example, 125 ° C.)) after the stop, the gas burner 350 is controlled to be ignited again. This first inlet side temperature control is performed for a certain period of time, for example, 5 minutes after the gas burner 350b is ignited.

After performing the first inlet side temperature control for a certain period of time, the process shifts to the fan variable speed control (step S90). In this fan variable speed control, the detection temperature detected by the inlet side temperature sensor 525 is compared with the preset control reference temperature (second control reference temperature) (temperature discrimination), and the detection temperature is the second control reference temperature. When it is higher than the upper limit value (second upper limit temperature Tmx2 (for example, 135 ° C.)), the rotation speed of the exhaust fan 235 is increased. When the detection temperature is lower than the lower limit of the second control reference temperature (second lower limit temperature Tmn2 (for example, 105 ° C.)), control is performed so as to reduce the rotation speed of the exhaust fan 235.

FIG. 15 is a flowchart illustrating a process of fan variable speed control. The control device 500 determines the temperature in steps S200 and S240. That is, in step S200, it is determined whether or not the temperature T detected by the inlet side temperature sensor 525 exceeds the second upper limit temperature Tmx2 (step S200). When it is determined in step S200 that the detection temperature T does not exceed the second upper limit temperature Tmx2 (No), it is determined whether or not the detection temperature T is below the second lower limit temperature Tmn2 (step S240). If it is determined in step S240 that the detection temperature T is not lower than the second upper limit temperature Tmn2 (No), it is considered that the detection temperature T is within the control reference temperature range, and the process returns to step S200 to determine the temperature. To continue.

On the other hand, when it is determined in step S240 that the detection temperature T is below the second upper limit temperature Tmn2 (Yes), the control device 500 is the first determination after the current temperature determination shifts to the fan variable speed control. Whether or not it is determined (step S250). If the temperature determination this time is the first determination (Yes), the process returns to step S200 and the temperature determination is continued without changing the rotation speed of the exhaust fan 235.

If it is determined in step S250 that the current temperature determination is not the first determination (No), the control device 500 reduces the rotation speed of the exhaust fan 235 by one step (step S260). For example, the rotation speed of the exhaust fan 235 is reduced from medium speed to low speed. As a result, the air volume is reduced, so that the inlet side temperature can be raised so as to be within the control reference temperature range. When the rotation speed of the exhaust fan 235 is changed, the control device 500 maintains the rotation speed and suspends the temperature determination until a predetermined holding time (for example, 1 minute) elapses (step S270). .. By providing the holding period after changing the rotation speed in this way, it is possible to prevent unnecessary fluctuations in the rotation speed of the exhaust fan 235.

In this way, after the initial stage of the drying process, the inside of the apparatus becomes warm, so that the inlet temperature may exceed the upper limit temperature. That is, when it is determined in step S200 that the detection temperature T exceeds the second upper limit temperature Tmx2 (Yes), the control device 500 determines whether or not the current rotation speed of the exhaust fan 235 is high (step). S210). In step S210, when the control device 500 determines that the current rotation speed is high (Yes), the air volume may be insufficient due to clogging of the lint filter 400 or the like. Treat as an error. In this case, the control device 500 shifts to the second inlet side temperature control (step S220) without performing the fan variable speed control, and performs the drying step by on / off control of the gas burner 350. That is, in this second inlet side temperature control, as in the first inlet side temperature control, when the detection temperature T of the inlet side temperature sensor 525 exceeds the second upper limit temperature Tmx2, the combustion of the gas burner 350 is stopped. To do. On the other hand, when the detection temperature T falls below the second lower limit temperature Tmn2 after the fire is extinguished, the gas burner 350 is controlled to be ignited again.

On the other hand, in step S210, when it is determined that the current rotation speed has not reached a high speed (No) in the case of the first determination or the like, the control device 500 increases the rotation speed of the exhaust fan 235 by one step (step S230). ). For example, the rotation speed of the exhaust fan 235 is increased from medium to high speed. As a result, the air volume increases, so that the inlet side temperature can be lowered so as to be within the control reference temperature range. When the rotation speed of the exhaust fan 235 is changed, the process proceeds to the temperature determination hold process in step S270.

Even while the temperature determination is pending in step S270, the control device 500 monitors the inlet side temperature sensor 525, and when the detection temperature T exceeds the burner stop reference temperature (for example, 155 ° C.), the gas burner Stop the burning of 350. In this case, the rotation speed of the exhaust fan 235 is forcibly set to a high speed. Further, when the detection temperature T falls below the burner ignition reference temperature (for example, 105 ° C.) after the stop, the gas burner 350 is controlled to be ignited again. If the holding time elapses without the detection temperature T exceeding the burner stop reference temperature, the process returns to step S200 and the same process is performed.

The fan variable speed control is performed as described above. As a result, during normal drying operation, the air volume is increased or decreased by changing the rotation speed of the exhaust fan 235 without controlling the on / off of the gas burner 350 so that it falls within the control reference temperature range. The temperature can be adjusted. As a result, the object to be processed can be efficiently dried while suppressing a sudden change in the temperature inside the shell 205, and as a result, the time required for the drying process can be shortened. Further, even when the air volume is reduced due to the lint filter 400 being slightly clogged, the optimum air volume can be secured by changing the rotation frequency of the exhaust fan 235. As a result, the frequency of cleaning work of the lint filter 400 can be suppressed.

In the series of processing of the fan variable speed control (or the second inlet side temperature control), the control device 500 monitors the outlet side temperature sensor 530, and the detection temperature of the outlet side temperature sensor 530 is predetermined. When the drying reference temperature is reached, the process proceeds to the outlet side temperature control in step S100 of FIG. In this outlet side temperature control, the control device 500 controls on / off of the gas burner 350 so as to maintain a constant temperature while maintaining the rotation speed of the exhaust fan 235 at the time of shifting to the outlet side temperature control. (For example, off at 75 ° C., on at 70 ° C.). When the preset drying time is completed, the combustion of the gas burner 350 is stopped, the drying process is completed, and the process proceeds to the cooling process. In this cooling step, while maintaining the rotation speed of the exhaust fan 235 at the end of the drying step, air is continuously blown into the shell 205 to cool the object to be processed for a predetermined time.

According to the embodiment of the present invention, the heating unit can be attached to the back side of the rotating drum (the side surface of the pulley 215) to guide the warm air into the rotating drum at the shortest distance from the heating unit. The drying operation can be carried out without lowering the temperature. Further, the warm air taken in from the opening can flow to the inner peripheral surface provided with the step and blown into the ventilation holes in almost the entire area of the inner peripheral surface. Further, since a large number of ventilation holes (through holes) for exhaust are formed only in the second region (exhaust region) on the opening / closing door side of the rotating drum, from the upper surface of the back surface of the rotating drum toward the bottom opening on the opening / closing door side. Warm air can be blown (diagonal direction). That is, the warm air is blown (diagonally in the diagonal direction) from the ventilation holes (through holes) formed in almost the entire inner peripheral surface of the back surface of the rotating drum toward the bottom opening on the opening / closing door side. Warm air can be blown while the clothes to be dried (object to be processed) in the drum are falling (the process of being lifted upward from the lower surface of the rotating drum by the hat and falling). As a result, the drying efficiency is increased and the drying work time can be set short.

Further, since the heating unit is attached to the back side of the rotating drum (the side side of the pulley 215), the ignition confirmation of the gas burner and the maintenance of the heating unit can be easily performed.

The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

100 ... Rotating drum type dryer 110 ... Operation panel 110 112 ... Switch 120 ... Drying processing chamber 122 ... Opening and closing door 124 ... Hinge mechanism 130 ... Exhaust chamber 200 ... Rotating drum 200a ... Back outer peripheral surface 200b ... Inner peripheral surface 200c ... No. 1 area 200d ... 2nd area (exhaust area)
205 ... Shell 205a ... Back plate 210 ... Hat 215 ... Rotating shaft 220, 225 ... Pulley 230 ... V belt 235 ... Exhaust fan 240 ... Exhaust duct 245 ... Heating unit 250 ... Tip 255 ... Mounting plate 260a-260d ... Connecting metal plate (Fixing member) 270, 270a to 270c ... Warm air 275 ... Opening 265, 280 ... Vent hole 280a ... Dowel 290 ... Exhaust port
295 ... Felt 298 ... Gold plate 300 ... Gas tap 305 ... Peephole
310 ... Front plate 315 ... Burner unit 317 ... Duct part 320 ... Warm air outlet 325 ... Inclined top plate 330 ... Horizontal plate 335 ... Vertical plate 340 ... Inclined plate 345 ... Heating unit Blower 350 ... Gas burner 400 ... Lint filter 500 ... Control device 505 ... CPU 510 ... ROM 515 ... RAM
520 ... Input interface 525 ... Inlet side temperature sensor 530 ... Outlet side temperature sensor 535 ... Air volume sensor 540 ... Output interface 545 ... Motor

Claims (4)

A drying processing chamber having at least an opening / closing door, a lateral cylindrical rotating drum for accommodating an object to be processed, and a shell for accommodating the rotating drum.
An exhaust chamber provided under the drying treatment chamber and
A rotary drive mechanism provided on the back surface of the drying processing chamber to rotationally drive the rotary drum,
It is a heating unit of a rotary drum type dryer equipped with
The heating unit
A gas burner unit and a duct portion provided on the upper side of the gas burner unit to guide warm air from the gas burner to the rotating drum are provided on the back surface of the drying processing chamber and on the side of the rotation driving mechanism. The heating unit of the rotary drum type dryer provided on the side. The gas burner unit has a shape in which the opening area is small upward due to the inclined plate.
The duct portion has a horizontal plate facing the hot air outlet of the gas burner unit, and a vertical plate that guides the warm air that has passed through the horizontal plate to an air outlet provided at an upper portion, according to claim 1. The heating unit of the rotary drum dryer described. The heating unit of the rotary drum type dryer according to claim 1, wherein the warm air is blown toward the opening of the back plate of the shell facing the air outlet of the duct portion. The heating unit of the rotary drum type dryer according to claim 2, wherein a temperature sensor for measuring the temperature of the hot air is provided near the horizontal plate and at a position away from the hot air outlet of the gas burner unit.