JP2863880B2 - Clothes dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clothes dryer, and more particularly, to a rotating drum for storing an object to be dried such as clothes, and to send hot air into the rotating drum to dry the same. The present invention relates to a clothes dryer of the type that is discharged by an apparatus.

[0002]

2. Description of the Related Art Conventionally, in a clothes dryer of the type described above, air heated by a heating device is supplied into a rotating drum as hot air by suction of a fan device, and the temperature in the rotating drum is controlled by the temperature of the fan device. The temperature is monitored by an exhaust gas temperature sensor provided in the exhaust duct. Then, the heating device is controlled so that the temperature detected by the exhaust gas temperature sensor becomes the set temperature.

[0003] Further, the heating power of the heating device is gradually reduced as drying proceeds, and when the temperature of the exhaust gas from the rotating drum reaches a set temperature with a predetermined heating power, it is determined that the drying is completed, and the heating by the heating device is performed. The operation is stopped, and then the operation of the fan device is stopped. However, this conventional device may be in an insufficiently dried state, an overdried state, or an overheated state depending on the outside air temperature.

[0004] The degree of drying of the material to be dried is determined by the temperature of the exhaust gas from the rotating drum. As described above, the heating power gradually decreases with the progress of the drying process. Is set to Therefore, the exhaust temperature of the rotating drum is equivalent to the temperature obtained by adding the outside air temperature and the temperature rise due to heating. When the outside air temperature is low, it appears lower, and conversely, when the outside air temperature is high. Appear high.

[0005] Therefore, when the outside air temperature is low, the exhaust temperature may not reach the reference value for judging the end of the drying even though the object to be dried in the rotating drum is dry. In this case, the inside of the rotating drum is in a heated state. Further, depending on how the reference value is set, a situation may occur in which the drying is determined to be completed in an undried state, contrary to the above.

The present invention relates to a "clothing dryer in which heating air supplied by a heating device is supplied to a rotating drum and air in the rotating drum is exhausted from an exhaust duct". Regardless, it is an object of the present invention to be able to accurately determine the end point of drying.

[0007]

The technical means of the present invention for solving the above-mentioned problems includes an exhaust temperature sensor (S ₂ ) for detecting the temperature of the exhaust gas from the rotating drum (10), and an external temperature sensor for detecting the external temperature. (S ₃ ), an intermediate reference temperature setting means for setting an intermediate reference temperature separately irrespective of the detected outside air temperature in order to determine the degree of progress of drying of the object to be dried, and the exhaust gas temperature sensor (S ₂ ) If the detected temperature of the heating device has risen to the intermediate reference temperature, the heating amount control means for stepwise reducing the heating amount by repeating the operation of reducing the heating value of the heating device by a set amount; and A reference value setting means for setting a reference value based on an outside air temperature; and an exhaust gas temperature sensor (S ₂ ) after the heat value has reached a predetermined heat value by decreasing the heat value stepwise. Detected temperature exceeds the reference value "It is provided with a termination determining means for outputting a drying completion signal when. (See Fig. 8)

[0008]

The above technical means operates as follows. When the drying operation starts and the temperature of the exhaust gas from the rotary drum (10) rises and is maintained at or above the intermediate reference temperature, the operation of decreasing the heating amount of the heating device by a set amount is repeated, and the heating amount is reduced. Is gradually reduced. That is, the heating amount of the heating device is reduced stepwise without considering the outside air temperature. Then, the operation of decreasing the heating amount stepwise is completed, and when the heating amount has reached the predetermined heating amount, the object to be dried is in a state of being dried to a predetermined drying degree. Even when the degree of drying of the object to be dried reaches a predetermined drying state, the temperature of the exhaust air from the rotating drum changes as the outside air temperature changes. The reference value for determining the end of drying is determined by the reference value setting means based on the outside air temperature, and the end determination means determines the reference value and the exhaust gas temperature sensor (S
The detected temperature is compared with ₂ ) to determine the end of drying.

Therefore, even if the outside air temperature changes as described above, it is determined that the drying is completed when the exhaust temperature reaches a value corresponding to the change. That is, when the object to be dried is in a predetermined dry state, the heating device is reliably stopped.

[0010]

[Effect] The drying operation is stopped in the completely dry state irrespective of the change in the outside air temperature, and the inconvenience of stopping the drying operation in the undried state and overheating in the rotating drum can be eliminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the configuration of an entire dryer embodying the present invention will be described in detail with reference to FIGS. [Overview of Overall Structure] As shown in FIG. 1, the casing (1) is provided with an opening / closing lid (13) for closing the central opening of the support ring (3) in the center of the front surface in a single-opening manner. The opening / closing lid
One side of (13) is pivotally supported by the front surface of the casing (1) so as to be able to rotate back and forth, and a handle (19) is arranged on the opposite side of the pivot.

In the casing (1), as shown in FIGS. 3 to 3, a rotating drum (10), an intake fan (F), a motor (15) for rotating both of them, and the rotating drum (10). Ten)
A support ring (3) that fits into the front opening of the support drum and supports the front part of the rotating drum (10), and the air supply port (30) of this support ring (3)
A gas burner (31) for supplying heated air through an air supply duct (4) and the above-mentioned intake fan (F) are accommodated and exhausted to the outside of the casing (1) through an exhaust duct (51). Built-in exhaust fan device (5).

As shown in FIG. 1, the rotary drum (10) has a shaft (16) projecting from the center of the rear surface thereof, and a mounting plate (1).
8), the front end of which is rotatably fitted to the outer periphery of a support ring (3) fixed to the casing (1) and supported by the support ring (3). It is rotatably accommodated in the casing (1) in such a manner. The outer peripheral portion of the rotating drum (10) and the motor
The belt is transmitted to the output shaft of (15). This allows
The operation of the motor (15) causes the rotating drum (10) to rotate. The internal structure of the rotary drum (10) is the same as that of the known one, and as shown in FIG. )
The object to be dried (M) is rotated by the chevron (17). Further, even when the amount of the object to be dried (M) is small, it is lifted up by the rotation of the rotary drum (10) and then falls, and the above operation is repeated according to the rotation of the object to be dried (M).

In order to drive the rotary drum (10) to rotate by a motor (15), as shown in FIG.
The belt (19) wound around the trunk of (0) is transmitted to the output pulley (P) of the motor (15) in such a manner that tension is applied by the intermediate wheel. Further, as shown in the figure, the output pulley (P) also transmits a belt to the pulley of the intake fan (F), and the rotary drum (10) and the intake fan (F) are driven by a common motor (15). Is driven to rotate by belt transmission.

[Hot Air Supply Structure] In this embodiment, as shown in FIG. 2, an air supply port (3) provided in the lower right portion of the support ring (3) is provided.
0), a heating air supply heated by a gas burner (31) as a heating device H is supplied into the rotary drum (10). The gas burner (31), as shown in FIG. It is composed of a pair of unit burners (31a) (31a) having continuous holes, and is housed in a burner box (32) that is opened to the side. The nozzle body provided in the burner box (32) and having a nozzle corresponding to each unit burner is connected to a valve device (V) by a pipe (G). The valve device (V) and a hose end (33) serving as a gas inlet to the valve device (V) are fixed to an auxiliary plate (34), and the hose end (33) projects outside the auxiliary plate (34). The auxiliary plate (34) is a right-angled triangular plate, and closes a triangular opening formed by a corner of the rear wall (11) and a rear end of a bottom plate and a rear end of a side plate of the casing (1). The peripheral edge is detachably fixed to the casing (1) or the rear wall (11) by screwing.

As shown in FIG. 2, the gas burner (31) includes an air supply duct (4) connected to an air inlet (30) of a support ring (3).
The air supply duct (4) is disposed in the combustion chamber (41).
As shown in Fig. 4, the front of the casing (1) and the support ring
(3) and a flat communication chamber (43) connecting the fan-shaped discharge chamber (42) and the combustion chamber (41). The combustion chamber (41) extends rearward from the lower rear surface, and the combustion chamber (41) is fixed to the casing (1).

The rear surface of the discharge chamber (42) is provided with a support ring (3).
As shown in FIG. 3, the rear surface of the discharge chamber portion (42) has openings (40) and (40) formed in a certain range from both ends of the fan shape. It is closed during (40). On the surface where the rear surface of the discharge chamber portion (42) is in contact with and coincides with the openings (40) and (40), there are formed open areas (30a) and (30b) in which a number of small through-holes are formed. This opening area functions as the above-described air supply port (30).

Therefore, in this embodiment, the gas burner (31)
Air heated by the combustion chamber (41) and the communication chamber (43)
Is discharged into the rotating drum (10) from the openings (40) and (40) and the opening areas (30a) and (30b) through the rotating drum (10).
(M) is heated by this hot air. In the drying step by heating, since the rotating drum (10) and the suction fan (F) are rotated by the motor (15), the matter to be dried (M) is, of course, agitated and moved. Fan (F)
As a result, the combustion exhaust gas and the heated air from the gas burner (31) are forcibly supplied from the air supply port (30) into the rotary drum (10) through the air supply duct (4).

In order to make the temperature distribution of the hot air heated by the gas burner (31) at the openings uniform, various types of air suction holes and openings are formed at predetermined locations. The combustion chamber (41) is a box extending rearward from the rear surface of the communication chamber (43), and the cross section of the box is one of the corners of a vertically long rectangle (opening (40) (40) (A corner portion located on the side) has an irregular pentagonal cross section in which a certain range is cut off, and an inclined surface (41a) corresponding to the cut portion has an opening.
(40) Turn to (40) side. When the burner box (32) is attached to the rectangular opening (41b) formed in the lower side wall of the inclined surface (41a), the flame hole of the gas burner (31) faces the combustion chamber (41) and faces in the horizontal direction. . The burner box (32) is formed with a large number of small holes in order to sufficiently supply the secondary air for combustion.

The gas burner (3) is provided at the end face of the combustion chamber (41).
A first opening (6) is provided on the side wall of the end face located near the flame hole of (1).
1), a second opening (62) is formed above the first opening, and a large number of first openings are formed near the lower side of the inclined surface (41a) on the side wall between the opening (41b) and the communication chamber (43). As shown in FIG. 5, a large number of second holes (64) and (64) are provided on the wall surfaces facing the holes (63) and (63), respectively.

Further, the combustion chamber on the back of the communication chamber (43)
A number of third holes (65) (65) are formed near the connection with (41) and between the discharge chamber (42). By adopting the air suction system with the above configuration, the hot air generated by the combustion of the gas burner (31) tends to rise due to the air suction effect of the fan device (5) and concentrates on the upper opening (40) side. The hot air which tends to be air-cooled by the suction air from the second opening (62), the first hole (63), the second hole (64), and the third hole (65), and the rising of the hot air As a result, the hot air that has reached the inside of the communication chamber (43) is diffused toward the lower opening (40). As a result,
The temperature distribution of the hot air supplied into the rotary drum (10) from the entire area of the air supply port (30) is made uniform.

The lower side of the second opening (62) has a combustion chamber.
A tongue piece (62a) inclined toward the inside of (31) is formed. Therefore, the air sucked by the suction force of the fan device (5) does not directly act on the combustion flame of the gas burner (31), and the combustion stability is not impaired by the sucked air. A similar tongue piece (61a) is also formed in the first opening (61) on the side adjacent to the combustion portion of the gas burner. Therefore, the suction air from the opening is also supplied into the combustion chamber along the opposed side wall of the combustion section, and the suction air does not adversely affect the combustion edge. Further, the flow of the suction air suppresses the tendency of the combustion exhaust gas to flow to the upper side of the discharge chamber portion (42), whereby the discharge temperature distribution of the hot air from the air supply port (30) is further uniformed. You.

Further, in this embodiment, the rotating drum (10)
Is set clockwise when viewed from the front. Under this condition, the opening range of the air supply port (30) is, as shown in FIG. (Right below the center of the center of (10)).
a) (30b) Each opening range is set to an arc-shaped section having an included angle of about 35 degrees. Therefore, the included angle of the non-opening portion sandwiched between the sections is about 20 degrees.

When the amount of the material to be dried (M) is small, the material to be dried (M) reaches the apex of the rotation locus of the chevron (17) by the rotation of the rotary drum (10), and then is moved downward. However, even in the case of such movement of the object to be dried (M), hot air from the opening area (30a) is effectively supplied to this falling area. On the other hand, when the amount of the material to be dried (M) is large, the material to be dried (M) is rotated in a circular shape in contact with the inner surface of the body of the rotary drum (10). When the dried matter (M) is moved, it is once heated by hot air in the opening area (30b) and then reheated in the opening area (30a).

[Drying end judging device] In this embodiment, in order to judge the drying end point, a clothes temperature sensor (S ₁ ) for detecting the temperature of the clothes in the rotating drum (10) and an exhaust duct (51) are used. Exhaust temperature sensor (S ₂ ) for detecting the exhaust temperature of the vehicle, and an external air temperature sensor (S ₃ ) for detecting the external air temperature.The clothing temperature sensor (S ₁ ) is provided with a support ring (3). It is arranged so as to be exposed on the inner surface and come into contact with the object to be dried (M). Further, the exhaust gas temperature sensor (S ₂ ) is provided in an exhaust pipe of an exhaust duct (51),
The outside temperature sensor (S ₃ ) is located at a position away from the gas burner (31).
In the air suction path to (4), for example, as shown in FIG. 1, it is fixed to a bracket provided near the first opening (61) on the inner wall of the casing (1).

In this embodiment, a microcomputer is used to determine the end of drying using the output from each of the above-mentioned sensors, which is configured to execute a program based on the flowchart shown in FIG. ing. The gas burner (31) reduces the thermal power by 8
In this embodiment, the heating power is gradually reduced in the range from the maximum heating power of the eighth heating power to the fourth heating power that is four steps lower than the maximum heating power.
Each time the inside of the rotary drum (10) drops to a predetermined temperature after the start of drying, the heating power is reduced stepwise from the eighth heating power to the fourth heating power. In addition, the third thermal power ~
The first thermal power is used for drying lingerie and the like.

In order to adjust the heating power, a configuration is employed in which the degree of opening of a motor-operated valve inserted into a gas circuit to a gas burner (31) is changed in accordance with a signal input. Omitted. Hereinafter, the actual drying judgment of this embodiment will be described with reference to the flowchart. When drying is started, the heating power of the gas burner (31) is set to the eighth heating power, and in this state, the drying process proceeds. In step (71), the detected temperature of the clothing temperature sensor (S ₁ ) becomes the first set temperature (74 ° C.) or the detected temperature of the exhaust temperature sensor (S ₂ ) becomes the second set temperature (68 ° C.). Will be monitored, and
When the temperature has risen, the thermal power of the gas burner (31) is reduced from the eighth thermal power to the seventh thermal power.

Then, with this heating power, hot air is supplied into the rotating drum (10), and in step (72), the temperature detected by the clothing temperature sensor (S ₁ ) becomes the third set temperature (76 ° C.) or Whether the detected temperature of the exhaust temperature sensor (S ₂ ) reaches the fourth set temperature (73 ° C.) is constantly monitored, and the setting corresponding to either the clothing temperature sensor (S ₁ ) or the exhaust temperature sensor (S ₂ ) is performed. When the temperature is reached, the thermal power of the gas burner (31) is reduced from the seventh thermal power to the sixth thermal power. Thereafter, each time the clothing temperature sensor (S ₁ ) reaches the third set temperature or the detected temperature of the exhaust gas temperature sensor (S ₂ ) reaches the fourth set temperature, the heating power of the gas burner (31) is reduced by one step. In this embodiment, the function unit in the microcomputer that stores the second set temperature and the fourth set temperature corresponds to the above-mentioned intermediate reference temperature setting means, and the gas burner (31)
.. Corresponds to the heating amount control means described in the section of the technical means described above.

Then, finally, when the heating power of the gas burner (31) is set to the fourth heating power, in step (73),
Reference value based on the output of the outside air temperature sensor (S ₃₎ is set.
This reference value corresponds to the above-mentioned set temperature to be compared with the detected temperature of the exhaust gas temperature sensor (S ₂ ) in the end determination means, and the range from less than 0 ° C. to more than 20 ° C. is divided into six levels. As shown in the figure, a reference value is determined for each outside air temperature range, and the outside air temperature range of the table stored in advance and the detection temperature (T) of the outside air temperature sensor (S ₃ ) are compared, A corresponding reference value is selected and set as a set reference value (T ₀ ). This step (73) corresponds to the aforementioned reference value setting means.

Thereafter, whether or not a predetermined time has elapsed is monitored in step (74), and when the predetermined time has elapsed, in step (75), the detected temperature of the exhaust gas temperature sensor (S ₂ ) and When the temperature is compared with the set reference value (T ₀ ) and the detected temperature of the exhaust gas temperature sensor (S ₂ ) reaches the set reference value (T ₀ ), it is determined that the drying is completed, and the combustion of the gas burner (31) is stopped. Is done. Thereafter, when a certain time has elapsed, the fan device (5) is stopped. Since the set reference value (T ₀ ) is corrected based on the outside air temperature, the end of drying can be accurately determined regardless of the outside air temperature.

In step (75), the exhaust gas temperature sensor (S
Prior to comparing the detected temperature of ₂ ) with the set reference value (T ₀ ), the heating state in which the heat of the gas burner is weakened to the fourth heat is forcibly continued for a certain time. This time is set to the time required for final heating when the amount of the material to be dried is small. In the case of a small amount of drying, the exhaust gas temperature tends to match the temperature of the heating air supply to the inside of the rotating drum. In this case as well, the drying is completed during the above-mentioned forced heating state. It is always completely dry regardless of the quantity of objects.

In the above embodiment, "outside air temperature-reference value"
The outside air temperature range of the table is from “20 ° C or more” to “0 ° C”.
The temperature range of “less than” is divided into six ranges in increments of 5 ° C., but this division can be set arbitrarily. Further, the set reference value may be a function value of the detected temperature of the outside air temperature sensor (S ₃ ). In the above embodiment, a gas burner (31) is used as the superheater H, but may be an electric heater.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX.

FIG. 3 is an exploded view of a main part.

FIG. 4 is an exploded perspective view of the air supply duct (4).

FIG. 5 is a perspective view of the combustion chamber from another direction.

FIG. 6 is a perspective view of a gas burner (31) and a gas circuit unit therefor.

FIG. 7 is a flowchart of a drying end determination device.

FIG. 8 is a diagram illustrating the principle of the present invention.

[Explanation of symbols]

(10) ・ ・ ・ Rotating drum (30) ・ ・ ・ Hot air supply port H ・ ・ ・ ・ Heating device (S ₂ ) ・ ・ ・ Exhaust temperature sensor (8) ・ ・ ・ Timer (S ₃ ) ・ ・ ・ Outside air temperature Sensor

Continued on the front page (72) Inventor Yuji Goto 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi Inside Rinnai Corporation (72) Inventor Tamotsu Yamaoka 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya City Inside Rinnai Corporation (72 Inventor Yoshimi Tsujimoto 2-26, Fukuzumi-cho, Nakagawa-ku, Nagoya-shi Linnai Co., Ltd. (56) References JP-A-60-215400 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , (DB name) D06F 58/28 D06F 58/02

Claims (1)

(57) [Claims] 1. A clothes dryer in which heating air supplied by a heating device is supplied into a rotating drum and air in the rotating drum is exhausted from an exhaust duct. Temperature sensor (S ₂ ) for detecting the outside temperature, outside temperature sensor (S ₃ ) for detecting the outside temperature, and a separate intermediate regardless of the detected outside temperature to determine the degree of progress of the drying of the material to be dried. An intermediate reference temperature setting means for setting a reference temperature, and an operation of reducing a heat generation amount of the heating device by a set amount when the detection temperature of the exhaust gas temperature sensor (S ₂ ) has risen to the intermediate reference temperature. Heating amount control means for decreasing the heating amount stepwise, reference value setting means for setting a reference value based on the detected outside temperature, and decreasing the heating value stepwise. Serial calorific value is not more after a predetermined amount of heat generated clothes drying said detected temperature of the exhaust gas temperature sensor (S ₂₎ has a termination determining means for outputting a drying completion signal when it exceeds the reference value Machine.