JP2007209419A - Washing/drying machine, and drying machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve excellent drying performance and silentness by using a fan with reduced noise while securing the sufficient quantity of wind even if an air channel for drying has many bends and a large channel resistance. <P>SOLUTION: An impeller 330, as a deformed conventional sirocco fan, has two kinds of vane bodies: a first vane body 334 having only an outer peripheral blade part which is circular as seen from the top, and a second vane body 335 having an inner peripheral blade part of the same shape as of the first vane body 334 extending from the inner side edge of the outer blade part to the inner peripheral side. The vane bodies are annularly disposed so that the second vane bodies 335 are located every integral number of first vane bodies 334. The inner peripheral blade part of the second vane body 335 is nearly triangular with the side facing an inlet as the bottom side, and the distal end on the inner peripheral side is bent to fall in the direction of rotation. With this structure, air can be smoothly taken from the inlet to be fed to the outside, and as the air resistance is small, the noise can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a washing dryer that dries after washing clothes and a drier that dries wet clothes after washing.

  In a laundry dryer such as a drum type laundry dryer, the air in the outer tub containing the laundry is sucked, dehumidified, and heated by a heater to be returned to the outer tub. Thus, a fan is used to generate an air flow in the ventilation path including the outer tub. For example, in the drum-type washing and drying machine described in Patent Document 1, a kind of centrifugal fan generally called a sirocco fan is used as a drying fan. As shown in FIG. 5 of the same document, the sirocco fan has an impeller in which a large number of wing bodies each having a circular arc shape when viewed from above are spaced apart from each other by a predetermined angle and arranged in an annular shape in the same direction as the rotation axis. The air sucked from is discharged in a direction substantially orthogonal to the rotation axis.

  Sirocco fans originally have a relatively large air flow. However, for the convenience of arrangement of each member inside the washing and drying machine, for example, when the bending of the ventilation path is increased or when the heater is arranged in the immediate vicinity of the air discharge port from the fan, the flow path resistance of the ventilation path is large. It becomes difficult to increase the air volume. In a washing and drying machine, when a sufficient air volume cannot be ensured during the drying operation, there are problems such as a long time for the drying operation and insufficient drying. In order to increase the air volume, it is effective to widen the width of each sirocco fan. However, in that case, wind noise increases, and noise in a low frequency region that is difficult to absorb, particularly with a sound absorbing material, increases, making it difficult to maintain quietness. For these reasons, there is a strong demand for a fan structure that can suppress noise while ensuring a sufficient air volume for drying in washing and drying machines and dryers.

  In general, in a washing and drying machine, water is used to dehumidify the moist air discharged from the outer tub, that is, water-cooled dehumidification is performed. There is. In recent years, water-saving is very important in washing and drying machines. For example, in the drum type washing and drying machine described in Patent Document 2, the cooling water used in the drying operation is collected and stored. A water storage tank is arranged in the lower space of the outer tub so that the stored water can be used for easy washing in the next washing. Thus, if it is set as the structure which reuses once used water, a considerable water-saving effect can be anticipated.

  Of course, it is also possible to use the water collected in the water storage tank as cooling water for dehumidification during the drying operation, so that it becomes unnecessary to use tap water during the drying operation, or even if it is used, the amount used Can be suppressed considerably. However, when water once used for dehumidification is collected and repeatedly used for dehumidification, there are the following problems.

  For example, as described in Patent Document 3, in a conventional drum-type washing / drying machine, during drying operation, the temperature of exhaust gas after heat exchange with laundry in the drum and the temperature of cooling water after being used for dehumidification are performed. , And the degree of drying of the laundry is determined based on the temperature difference, thereby controlling the end of the drying operation. When the laundry in the drum dries to some extent, the amount of heat taken away from the heated air supplied into the outer tub decreases, so the exhaust temperature begins to rise gradually. Conversely, the amount of heat given to the cooling water is The temperature of the cooling water starts to gradually decrease due to the decrease. Thereby, since the difference between both temperatures gradually increases, it is possible to detect the end of drying based on the temperature difference as described above.

  However, when tap water is used as the dehumidifying cooling water, the above control is possible on the assumption that the temperature of the supplied cooling water is substantially constant, but the dehumidifying cooling water is recovered. In the case of repeated use, the amount of heat supplied to the cooling water is added with the lapse of time of the drying operation, so that the assumption that the temperature of the supplied cooling water is almost constant is not satisfied. Therefore, when the dryness of the laundry is judged by a conventional method, the variation in the dryness becomes large, and the drying ends in a state where the laundry is not sufficiently dried or conversely becomes too dry. May cause damage to the laundry cloth.

JP 2003-290588 A Japanese Patent No. 2650339 JP 2003-290586 A

  The present invention has been made to solve the above-mentioned problems, and a first object is to generate a sufficient amount of air for drying and at the same time generate noise even when the flow path resistance of the ventilation path is large. Another object of the present invention is to provide a washing / drying machine and a dryer equipped with a fan capable of suppressing the above-described problem.

  The second object of the present invention is to improve the accuracy of the determination of the dryness of the laundry in the water-saving washing and drying machine that collects the dehumidifying cooling water used once and can be used repeatedly. An object of the present invention is to provide a washing / drying machine capable of preventing shortage and excessive drying.

In order to achieve the first object, the first invention is configured to be rotatably provided in an outer tub, and an inner tub in which laundry is accommodated, and both ends connected to the outer tub. Ventilation path, a blower fan for generating an air flow, a heater for heating air to be sent into the outer tub, and a dehumidifying unit for dehumidifying the moist air discharged from the outer tub disposed in the ventilation path The centrifugal fan that sucks air in the axial direction on the inner peripheral side of the impeller that is rotationally driven by a motor and discharges air from the inner periphery to the outer peripheral side of the impeller. Because
The impeller includes a first wing body having only an outer peripheral blade portion having an arc shape when viewed from above, and an inner periphery extending from an inner peripheral edge of the outer peripheral blade portion having the same shape as the first wing body to the inner peripheral side. Two types of wing bodies, the second wing body having the side blade portions, are arranged in an annular shape so as to surround the rotating shaft and the second wing body is located at every integer number of the first wing body. It is characterized by.

A second invention made to achieve the first object includes a drying chamber in which wet laundry is stored, and a fan and a heater for blowing in the heating chamber to supply heated air to the drying chamber. In the dryer having the ventilation path provided, the fan sucks in the axial direction on the inner peripheral side of the impeller rotated and driven by a motor, and discharges air from the inner periphery to the outer peripheral side of the impeller Who is a fan of
The impeller includes a first wing body having only an outer peripheral blade portion having an arc shape when viewed from above, and an inner periphery extending from an inner peripheral edge of the outer peripheral blade portion having the same shape as the first wing body to the inner peripheral side. Two types of wing bodies, the second wing body having the side blade portions, are arranged in an annular shape so as to surround the rotating shaft and the second wing body is located at every integer number of the first wing body. It is characterized by.

  Both the washing and drying machine according to the first invention and the drying machine according to the second invention are characterized by a fan impeller for generating an air flow to be supplied to an inner tub or a drying chamber in which laundry to be dried is stored. It has a typical configuration. That is, in the configuration of the conventional impeller, the wing bodies that surround the rotating shaft and are arranged in an annular shape are all first wing bodies that have only the outer peripheral blade portion having an arc shape when viewed from above. In such a configuration, the second wing body having the inner peripheral side blade portion extending from the inner peripheral side edge portion of the outer peripheral side blade portion having the same shape as the first wing body to the inner peripheral side is every integer number of the first wing body. Is arranged.

  As one embodiment of the first and second inventions, the inner peripheral blade portion of the second wing body has an arc shape when viewed from above, and is connected to the outer peripheral blade portion that is arc shape when viewed from above in a substantially ε shape. It can be configured. Alternatively, the inner wing portion of the second wing body may be configured to be linear when viewed from above.

  In any case, the inner peripheral blades of the second wing body extend to the inner peripheral side, that is, the intake port side formed in the fan casing, and the inner peripheral blades of the second wing body adjacent to each other in the rotational direction. Since the interval between the portions is sufficiently wide and the air resistance is small, more air can be taken in and sent out to the outer peripheral side by the action of the inner peripheral blade portion. Thereby, the air volume can be increased as compared with the conventional configuration. In addition, the inner wing portion of the second wing body acts as a rectifying plate and smoothly guides air to the gap between the outer wing portions of the first wing body and the second wing body, thereby reducing air resistance. Wind noise (noise) can be reduced.

  Further, in the above impeller, the inner peripheral tip of the edge facing the air inlet side formed in the fan casing on the inner peripheral blade part of the second wing body is tilted toward the rotation direction side of the impeller. A bent configuration is preferable.

  According to this configuration, when the impeller rotates, the air contact surface on the inner peripheral blade portion of the second wing body becomes a gently curved concave surface, so that the air flow becomes smoother and the airflow is reduced. It is effective for increasing and reducing noise.

  In the impeller, at least a part of the inner peripheral side blade portion of the second wing body extends to a position corresponding to the inside of the opening of the intake port formed in the fan casing. It may be configured.

  According to this structure, the air located in the immediate vicinity of the outside of the intake port is smoothly sucked into the fan casing, which is effective for increasing the air volume and further reducing noise.

  Furthermore, in the impeller, it is the edge facing the air intake that particularly contributes to an increase in the air volume in the inner peripheral blade portion of the second wing body. Therefore, the edge on the side opposite to the intake port may have a short extension length toward the inner peripheral side, so that the area of the air flow sucked from the intake port and traveling in the direction along the axis is reduced. Noise can be further reduced. For this reason, for example, the inner wing portion of the second wing body may have a substantially triangular shape having a bottom side on the air inlet side formed in the fan casing.

  Furthermore, even if the number of the second wing bodies is too small as compared with the number of the first wing bodies, a sufficient air volume increasing effect cannot be obtained, so that the second wing body is one, two or three of the first wing bodies. It is good to set it as the structure arrange | positioned at equal intervals around the rotation axis.

According to a third aspect of the present invention, which is achieved to achieve the second object, an outer tub is rotatably provided, an inner tub in which laundry is accommodated, and both ends connected to the outer tub. Ventilation path, a blower fan for generating an air flow, a heater for heating air to be sent into the outer tub, and a dehumidifying unit for dehumidifying the moist air discharged from the outer tub disposed in the ventilation path And a storage unit that collects water used for washing and / or used for dehumidification for drying and stores it as intermediate water, and a dehumidifying middle water supply that supplies the intermediate water stored in the storage unit to the dehumidifying unit A washing and drying machine comprising: a means and a dehumidifying tap water supply means for supplying tap water supplied from the outside to the dehumidifying unit;
An exhaust temperature detecting means that is disposed in the ventilation path and detects the temperature of air in the middle of being discharged from the outer tub and heated again by the heater;
Dehumidified water temperature detecting means for detecting the temperature of water after being used for dehumidification in the dehumidifying section;
A cooling water switching control means for controlling the dehumidifying middle water supply means and the dehumidifying tap water supply means so as to switch between cooling water supplied to the dehumidifying unit during drying operation between middle water and tap water;
A means for determining the dryness of the laundry in the inner tub based on the exhaust temperature by the exhaust temperature detecting means and the dehumidified water temperature by the dehumidified water temperature detecting means, the cooling water by the cooling water switching control means A drying operation control means for switching a method of determining the dryness of the laundry in conjunction with the switching;
It is characterized by having.

  In the washer / dryer according to the third aspect of the present invention, as the dehumidifying cooling water during the drying operation, tap water whose temperature is considered to be substantially constant from the beginning to the end of the drying operation, or the temperature gradually increases from the start of the drying operation. It is possible to select either the intermediate water that is supposed to be used, but the drying operation control means determines the dryness of the laundry depending on whether the intermediate water or tap water is used. Change the method of judgment. As a result, the temperature of the dehumidified water after being used for dehumidification (in this specification, the cooling water after being used for dehumidification and the water generated by condensation due to condensation are collectively referred to as dehumidified water). Without being influenced by the situation, it is possible to accurately determine the dryness of the laundry, and it is possible to terminate the drying operation at an appropriate time.

  Specifically, in the washer / dryer according to the third aspect of the invention, the drying operation control means performs washing on the basis of an added value of the exhaust temperature and the dehumidified water temperature when middle water is used as the cooling water for dehumidification. It can be set as the structure which judges the dryness of an object and complete | finishes drying operation.

  When middle water is used as the cooling water as described above, the temperature of the dehumidified water gradually increases as time elapses from the start of the drying operation. In a period in which the exhaust gas temperature rises (so-called “decreasing rate drying period”), the temperature rise rate of the added value of the exhaust gas temperature and the dehumidified water temperature is greater than the exhaust gas temperature itself. Therefore, for example, when it is determined that the laundry has sufficiently dried when the value reaches a certain predetermined value and the end control of the drying operation is performed, the time variation of the end control is reduced. Thereby, insufficient drying and excessive drying can be prevented.

  However, under certain circumstances, such as when the initial temperature of the intermediate water stored in the storage part is quite low, or when the ambient temperature is low and the degree of increase in the dehumidified water temperature is relatively slow even after the drying operation time has elapsed, Even when the laundry is sufficiently dried, there may be a case where the sum of the exhaust temperature and the dehumidified water temperature does not reach a predetermined value, and there is a possibility that the laundry will become too dry. Therefore, when the middle water is used as the dehumidifying cooling water, the drying operation control means controls the end of the drying operation based on the added value of the exhaust temperature and the dehumidified water temperature, and the exhaust temperature It is preferable that the end control of the drying operation based only on the control is executed in parallel.

  According to this configuration, the drying operation is terminated when the exhaust gas temperature reaches another predetermined value even when the added value of the exhaust gas temperature and the dehumidified water temperature does not reach the predetermined value under the specific conditions as described above. By doing so, it is possible to prevent the laundry from being dried too much. Furthermore, abnormally prolonged drying operation time can be prevented.

  In the laundry dryer according to the third aspect of the invention, the drying operation control means can dry the laundry based on the difference between the exhaust temperature and the dehumidified water temperature when tap water is used as the cooling water for dehumidification. It can be set as the structure which judges a condition and complete | finishes a drying operation.

  When tap water is used as cooling water, the temperature of the supplied water can be considered to be almost constant, so the amount of heat given by the dehumidifying unit in the above-mentioned reduced-rate drying period is more than that in the previous period (so-called constant rate drying period). However, the temperature of the dehumidified water tends to decrease. Therefore, the difference between the exhaust temperature and the dehumidified water temperature has a greater temperature change than the exhaust temperature itself. Therefore, for example, when it is determined that the laundry has sufficiently dried when the value reaches a certain predetermined value and the end control of the drying operation is performed, the time variation of the end control is reduced. Thereby, insufficient drying and excessive drying can be prevented.

  In this case, however, the difference between the exhaust temperature and the dehumidified water temperature may not reach a predetermined value even when the laundry is sufficiently dried. Similarly, it is preferable that the end control of the drying operation based only on the exhaust gas temperature is also executed in parallel.

  According to the laundry dryer according to the first invention and the dryer according to the second invention, the laundry can be dried even when the flow path resistance in the ventilation passage for feeding heated air into the outer tub or into the drying chamber is large. It is possible to suppress the operation sound (wind noise) of the fan while ensuring a sufficient air volume. Thereby, it is possible to achieve both good drying performance and quietness in the laundry dryer or dryer.

  Further, according to the laundry dryer according to the third aspect of the present invention, the water (medium water) used for washing and drying dehumidification can be collected and used repeatedly for drying dehumidification. Whether to use medium water or to use tap water supplied from the outside, it is possible to accurately determine the dryness of the laundry stored in the inner tub and terminate the drying operation. it can. Thereby, it is possible to prevent clothes from being damaged due to insufficient drying or excessive drying.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a washing and drying machine according to the present invention and a drum type washing and drying machine as an embodiment of the drying machine will be described with reference to the drawings. FIG. 1 is an external perspective view of a drum-type washing / drying machine according to this embodiment, FIG. 2 is a schematic side sectional view of the drum-type washing / drying machine according to this embodiment, and FIG. FIG. 4 is a rear perspective view of the main part inside the casing of the drum type washing / drying machine of this embodiment.

  The casing 1 forming the outer shape of the drum type washing and drying machine has a substantially box shape as a whole. The front surface 1a of the housing 1 is slightly curved from the upper part to the center part, and is slightly inclined upward. A substantially circular clothing input port 1b is formed there, and the clothing input port 1b extends inside. It can be opened and closed with a laterally openable door 2 that can be seen through. In addition, an operation panel 5 that is elongated in the left and right directions and has various operation keys and indicators arranged thereon is provided on the upper portion of the front surface 1a, that is, on the clothes insertion opening 1b. The drawer type dry filter container 7 is also installed on the right side.

  A water supply hose connection port 3 to which the other end of a water supply hose whose one end is connected to a water tap is connected is arranged on the upper surface 1c of the housing 1, and one end is immersed in the bath water in the bathtub on the right side thereof. A bath water hose connection port 4 to which the other end of the bath water hose is connected is arranged. The water supply hose connection port 3 is formed by exposing a water inlet of a water supply valve 21a described later directly to the upper surface, and the bath water hose connection port 4 is formed by exposing the water inlet of the bath water pump 22 directly to the upper surface. Has been.

  As shown in FIG. 2, an outer tub 10 having a substantially cylindrical peripheral surface is moderately rocked inside the housing 1 by a damper 11 that supports the left and right sides and a spring (not shown) that pulls the upper part. It is held freely. A front surface of the outer tub 10 is formed with an outer tub front surface opening 10a that is open in a circular shape relative to the clothing input port 1b of the housing 1, and a peripheral edge portion of the outer tub front surface opening 10a and a peripheral edge portion of the clothing input port 1b. Are connected by a flat cylindrical packing 12 made of an elastic material such as rubber.

  Inside the outer tub 10, a drum 13 having a substantially cylindrical shape for accommodating laundry is supported by a main shaft 14 that extends in the front-rear direction and is inclined forward. The front end surface of the drum 13 is formed with a drum front opening 13a that is widely opened. When the door 2 is opened, the interior of the drum 13 is passed through the outer tank front opening 10a and the drum front opening 13a from the upper front side. You can peek into it. Here, the inclination angle θ of the central axis C of the drum 13, that is, the central axis of the main shaft 14 is set to about 15 ° with respect to the horizontal line, but this is an example, and the inclination angle θ is about 10 to 30 °, for example. Is set at an appropriate angle.

  The front end of the main shaft 14 is firmly fixed to the rear surface of the drum 13 and is rotatably supported by a bearing 16 of a bearing fixing member 15 attached to the rear surface portion of the outer tub 10. A rotor 172 of an outer rotor type motor (drum motor) 17 is attached to an end portion of the main shaft 14 protruding rearward of the outer tub 10, while a stator 171 of the motor 17 is fixed to the bearing fixing member 15. Yes. The rotor 172 including the permanent magnet is disposed so as to surround the outer peripheral side of the stator 171 including the winding. When a drive current is supplied to the stator 171, the rotor 172 rotates and is identical to the rotor 172 via the main shaft 14. The drum 13 is rotationally driven at a rotational speed of.

  A water supply unit 20 including a water supply valve 21a, a cooling water valve 21b, a bath water pump 22 for bath water supply, a water inlet 23, and the like is disposed in the upper space in the housing 1. The water inlet directed upward of the water supply valve 21 a is the water supply hose connection port 3, and the water inlet directed upward of the bath water pump 22 is the bath water hose connection port 4. A water injection port 23 in which the detergent container 6 can be pulled out is disposed in front of the water supply valve 21a, and the water supplied to the water injection port 23 via the water supply valve 21a and the bath water pump 22 mainly passes through the interior of the detergent container 6. As a result, the water is supplied into the outer tub 10 from the water throat 25 provided at the rear portion of the outer tub 10 through the irrigation pipe 24 connected to the bottom of the water throat 23.

  As described above, the water supplied and stored in the outer tub 10 flows into the drum 13 through the water passage hole 13b. In addition, water discharged from the laundry in the drum 13 during dehydration due to the high-speed rotation of the drum 13 scatters to the outer tub 10 side through the water passage hole 13b. A drain outlet 26 is provided behind the bottom of the outer tub 10, and the drain outlet 26 is connected to an inlet of a drain valve 27. When the drain valve 27 is opened, water stored in the outer tub 10 is stored. Is discharged out of the machine through the drain pipe 28.

  On the other hand, the drain outlet 26 is also connected to the inlet of the water storage valve 41, and when the drain valve 27 is closed and the water storage valve 41 is opened, the water stored in the outer tub 10 is drained from the drain pipe 28. Instead, it flows into the water storage tank 40 having a capacity of about 30 liters, which is installed in the housing 1 below the outer tub 10. Thereby, the water once used for washing can be stored in the water storage tank 40 without discarding. The water storage tank 40 and the water inlet 23 are connected by a circulating water channel 43, and a middle water pump 42 and a water supply circulating valve 44 are provided in the middle.

  In this drum type washing and drying machine, after the final rinse with tap water is executed, the water used for the rinse is stored in the water storage tank 40 without being discarded. The water storage tank 40 is provided with a purification device (not shown) for purifying stored water (middle water), and the action of this purification device suppresses the propagation of germs. When the intermediate water supply is designated at the time of the next washing, the intermediate water pump 42 is operated when the water supply is executed, and the intermediate water stored in the water storage tank 40 is sucked and sent to the water inlet 23 through the circulating water channel 43. Then, it is supplied into the outer tub 10 through the detergent container 6 instead of tap water or bath water. Thereby, the amount of water used for washing can be significantly reduced compared with the past. Moreover, this middle water is utilized also at the time of drying so that it may mention later.

  In order to perform the drying operation, as shown in FIGS. 3 and 4, an air discharge port 31 is provided in the lower rear surface of the outer tub 10, and the ventilation path 32 connected to the air discharge port 31 is located behind the outer tub 10. The air supply port 36 is provided on the upper front surface of the outer tub 10 through the right side and the upper side. In the middle of the ventilation path 32, a drying filter 7 a housed in a drying filter container 7 that can be drawn forward, a fan 33 including an impeller 330 that is driven to rotate by a fan motor 34, and a drying PTC heater 35. Are arranged along the air flow. Further, the inside of the upright portion of the ventilation path 32 is a dehumidifying portion 32a that cools the moist air discharged from the drum 13 and condenses and liquefies the water vapor contained in the air (that is, dehumidifies) 32a. . For this dehumidification, the end of the cooling water hose 29 through which the tap water supplied to the water supply hose connection port 3 flows through the cooling water valve 21b is connected to the upper part thereof. Similarly, for the purpose of dehumidification, a watering chamber 37 having a watering hole 37 a is provided in an upright portion of the ventilation passage 32, and the watering chamber is passed through a dehumidification recirculation valve 45 by a dehumidifying middle waterway 46 branched from the circulation waterway 43. The intermediate water is supplied to 37, and the intermediate water exceeding the amount that can be sprinkled is returned to the water storage tank 40 via the return intermediate water channel 47.

  Thus, during the drying operation, the air flow generated by the fan 33 by driving the fan motor 34 is heated by the PTC heater 35 and then supplied from the air supply port 36 into the outer tub 10. When the heated air passes through the inside of the drum 13, it exchanges heat with the laundry to remove moisture, and flows into the ventilation path 32 through the air outlet 31. Cooling water, which is tap water or medium water, is continuously or intermittently supplied to the dehumidifying part 32a in the upright part of the ventilation path 32, and heated air containing a large amount of water vapor passes through the dehumidifying part 32a. At the same time, water vapor in the air condenses and condenses. Condensed water flows along the inner wall of the ventilation path 32 together with the cooling water after being used for dehumidification, flows into the outer tub 10, exits from the drain outlet 26, and is collected in the water storage tank 40 through the water storage valve 41. The dry air from which water vapor has been removed by the dehumidifying unit 32a circulates through the drying filter 7a, returns to the PTC heater 35 through the fan 33, and so on. Foreign matters such as lint, dust and pollen mixed in the air when passing through the drying filter 7a are removed.

  Next, the structure of the fan 33, which is one of the features of the drum type washer / dryer of this embodiment, will be described in detail. FIG. 5 is an external perspective view (a) of a fan / heater unit in which the fan 33 and the PTC heater 35 are integrated, and an internal perspective view in a state cut by a horizontal plane at a position just below the upper wall surface thereof. is there. The flat casing 100 is formed by joining two members of a lower casing 101 and an upper casing 102 by welding or the like. A circular intake port 104 is formed on the upper wall surface of the casing 100 and is not visible in FIG. 5, but a fan motor 34 is mounted below the lower wall surface of the casing 100 below the intake port 104. Has been.

  Inside the casing 100, an overall disk-shaped impeller 330 is provided as a main part of the fan 33, which is fixed to a rotating shaft that protrudes substantially vertically upward from the lower wall surface immediately below the air inlet 104. The side wall surface of the casing 100 is formed in an arc shape so that an arc-shaped air passage 105 is formed in the gap between the outer peripheral surface of the impeller 330, and the arc-shaped standing wall 103 is continuously formed inside the casing 100. Is formed. The interior of the casing 100 is partitioned into a fan chamber 107 and a heater chamber 108 by the standing wall 103, and a portion where the standing wall 103 is interrupted serves as a discharge port 106 of the fan 33.

  An elongated PTC heater 35 is disposed in the heater chamber 108 so as to lie down, and a discharge port 110 is formed on the lower wall surface of the casing 100 on the opposite side of the discharge port 106 across the PTC heater 35. Further, a rectifying rib 109 is provided in the heater chamber 108 in the vicinity of the discharge port 106 to disperse the air flow discharged from the discharge port 106 and flow to the PTC heater 35. The discharge port 110 is also heated by the PTC heater 108. A rectifying rib 111 for smoothly flowing the air downward is formed.

  FIG. 18 is a plan view of the discharge port 106 as viewed from the fan chamber 107. The discharge port 106 has an upper right corner formed in an oblique shape so that the lower opening width is wider than the upper opening width. As a result, air easily flows from the right discharge port 106b defined by the rectifying rib 109 so as to spread further to the right, and the air flow is appropriately distributed to the PTC heater 35 that is elongated in the horizontal direction. It hits the heater 35. As a result, air can be efficiently heated.

  6 is an external perspective view of an impeller 330 that is a rotating body, FIG. 7 is a top plan view of the impeller 330, FIG. 8 is a front plan view of the impeller 330, and FIG. 9 is a cross-sectional view taken along the line AA ′ in FIG. is there.

  The impeller 330 is sandwiched between a base plate 331 made of a sheet metal having a substantially disc shape and a center bulging upward, a fixed plate 332 that is a donut-shaped sheet metal, and the base plate 331 and the fixed plate 332. And a plurality of (in this example, 36) wing bodies 333 arranged in an annular shape at equal angular intervals (in this example, 10 °). The wing body 333 has two types of shapes, and one is a first wing body 334 including only an outer peripheral blade portion having an arc shape when viewed from above. The other one is a second wing body 335 having an inner peripheral blade portion 335b extending from the inner peripheral edge of the outer peripheral blade portion 335a having the same shape as the first wing body 334 to the inner peripheral side. It is. The shape of the inner peripheral blade portion 335b of the second wing body 335 is a substantially triangular shape whose bottom is the side facing the air inlet 104 (the front side perpendicular to the paper surface in FIG. 7), and the first wing body 334 is formed. As in the case of the top view, it is arcuate in top view, but its curvature is larger than the curvature of the outer blade portion 335a. As a result, the second wing body 335 as a whole has a substantially ε shape in top view.

  Further, the upper edge portion of the inner wing portion 335b of the second wing body 335, that is, the inner peripheral side end portion on the side facing the intake port 104 is the rotational direction of the impeller 330 (the clockwise direction in FIGS. 7 and 9). ) Is twisted to fall. Thereby, when the impeller 330 rotates, the surface that the air impinges on the inner peripheral blade portion 335b is a gently curved concave surface. In addition, as shown in FIG. 7, the inscribed circle at the inner peripheral end of the inner peripheral blade portion 335 b of the second wing body 335 protrudes inward from the inner edge of the intake port 104. Therefore, when the intake port 104 is viewed from directly above the casing 100, a part of the inner peripheral blade portion 335b of the second wing body 335 is exposed.

  In total, there are 36 blade bodies 333, of which 24 are the first blade bodies 334 and 12 are the second blade bodies 335, and there are two first blade bodies 334 in the rotational direction of the impeller 330. They are arranged in such a distribution that one second wing body 335 comes after being continuous. That is, the two first wing bodies 334 are arranged between the two second wing bodies 335 adjacent to each other in the rotation direction over the entire circumference of the impeller 330.

  When the impeller 330 configured as described above is rotationally driven, the air near the intake port 104 is smoothly supplied to the fan chamber 107 by the action of the inner blade 335b of the second wing body 335 that protrudes to the inner side of the intake port 104 in particular. The air flow is divided into three gaps formed between two first wing bodies 334 that are sucked into the interior and sandwiched between two adjacent second wing bodies 335, and then outward. Sent out. Thereby, the air volume can be increased as compared with the impeller having a conventional structure in which only the first wing body 334 is arranged in an annular shape. Further, by making the shape of the inner peripheral blade portion 335b of the second wing body 335 into a substantially triangular shape, wind noise can be suppressed and noise reduction can be achieved, and the air contact surface of the inner peripheral blade portion 335b. Since the air flows more smoothly due to the concave shape, further noise reduction can be achieved.

  The inventor has conducted a demonstration experiment for confirming the effect of increasing the air volume and reducing the noise with respect to the shape of the second wing body 335 and the number of the first wing body 334 and the second wing body 335 in the impeller. FIGS. 10 to 15 are perspective views showing the shape of the impeller used in the experiment. Of these, FIG. 10 is a conventional type, that is, an impeller composed of the first wing body in which all the wing bodies have the above-mentioned configuration. FIG. 11 to FIG. 15 are according to the present invention, and each has a first wing body 334 and a second wing body 335.

  FIG. 17 is a diagram illustrating a difference in characteristic shape of each impeller illustrated in FIGS. 10 to 15 and actual measurement values of noise and air volume. In addition, the rotational speed of the impeller at the time of actual measurement is 4500 rpm.

  In the impeller 330a shown in FIG. 11, the inner wing portion 335b of the second wing body 335 has a bottom length (defined here by the length of the chord of the inner wing portion 335b that is arcuate in top view). The first wing body 334 and the second wing body 335 are each 18 in number, and one first wing body 335 is adjacent between the two second wing bodies 335 in the rotation direction. It is arranged so that the wing body 334 is located. When the inner peripheral blade portion 335b has a bottom length of 10 mm, the inner peripheral blade portion 335b does not protrude inward of the intake port 104 (that is, when the casing 100 is viewed from above, the blade All the body 333 is hidden).

  In the impeller 330b shown in FIG. 12, the shape of the inner peripheral blade portion 335b of the second wing body 335 is not substantially triangular, and the number of the first wing bodies 334 is 24, and the number of the second wing bodies 335 is 12. The two first wing bodies 334 are arranged between the two second wing bodies 335 adjacent to each other in the rotation direction.

  The impeller 330c shown in FIG. 13 has the same shape as the impeller 330 described in the above embodiment, and the inner peripheral blade portion 335b of the second wing body 335 has a substantially triangular shape with a bottom length of 18 mm. . The impeller 330d shown in FIG. 14 has the same shape of the second wing body 335 as the impeller 330c shown in FIG. 13, but the number of the first wing bodies 334 is 27 and the number of the second wing bodies 335 is nine. The three first wing bodies 334 are arranged between the two second wing bodies 335 adjacent to each other in the rotation direction. Further, the impeller 330e shown in FIG. 15 is the same as the impeller 330c shown in FIG. 13 except that the length of the bottom side of the inner peripheral blade portion 335b of the second wing body 335 is extended to 30 mm. When the length of the bottom of the inner peripheral blade portion 335 b is 30 mm, the inner peripheral blade portion 335 b protrudes about 20 mm inward of the intake port 104.

  Comparing the actual measurement results of noise and air volume of the impellers 330a to 330e with the actual measurement result of the conventional impeller, it can be seen that noise can be reduced while ensuring an equal or higher air volume. In particular, in the impeller 330c employed in the configuration of the above embodiment and the impeller 330e in which the length of the bottom side of the inner peripheral blade portion 335b of the second wing body 335 is extended, the noise is reduced by 6 dB or more while the air volume is increased by 10% or more. Can be made. Furthermore, in addition to the effect of reducing the sound pressure of the noise, by providing the second wing body 335 having the inner peripheral blade portion 335b, the flow of the wind noise is changed from the low frequency range to the high frequency range by smoothing the air flow. The phenomenon of migration is confirmed. In general, when sound absorption is performed using a sound absorbing material or the like, even if the sound pressure is the same, there is an advantage that sound in a high frequency range is easier to absorb than sound in a low frequency range. For this reason, adopting each of the components such as the impellers 330a to 330e is advantageous not only in reducing the sound pressure level of noise but also in that noise countermeasures are easy.

  In addition, if the length of the bottom side of the inner peripheral blade portion 335b of the second wing body 335 is further extended, the noise can be further reduced and the air volume can be increased. For example, like the impeller 330f shown in FIG. You may make it connect the inner peripheral front-end | tip part of the inner peripheral side blade | wing part 335b of the wing | blade body 335 in ring shape. This eliminates the shake of the inner peripheral blade portion 335b during rotation, and is particularly effective in reducing noise.

  As described above, in the drum type washing and drying machine of the present embodiment, by using the fan 33 having the impeller 330 having a characteristic configuration, in the ventilation path 32 having a relatively large flow resistance as described above, the flow resistance is relatively large. In addition, a sufficient air volume can be secured and drying can be performed efficiently. Moreover, the noise accompanying it can be reduced and the quietness at the time of drying can be improved.

  Next, an electric system configuration in the drum type washing and drying machine of the present embodiment will be described with reference to FIG. The control unit 50 corresponding to the cooling water switching control means and the drying operation control means in the present invention is mainly composed of a microcomputer including a CPU, a ROM, a RAM, a timer and the like, and is based on a control program stored in the ROM. Then, various controls for performing the operation of each process of washing, rinsing, dehydration and drying are executed.

  A key input signal is given to the control unit 50 from the operation unit 52, and the water level detection unit 54 in the outer tub that detects the water level stored in the outer tub 10 and the water storage that detects the water level in the water storage tank 40. The tank water level detection unit 55, the exhaust temperature sensor (exhaust temperature detection means in the present invention) 38 for detecting the temperature of the air in the ventilation passage 32, and the dehumidified water temperature sensor for detecting the temperature of the dehumidified water (dehumidified water in the present invention) Detection signals are respectively input from the temperature detection means 39). Further, a display unit 53 and a load driving unit 51 are connected to the control unit 50, and the drum motor 17, the fan motor 34, the PTC heater 35, the water supply valve 21a, and the cooling water valve 21b are connected via the load driving unit 51. The operation of the drain valve 27, the water storage valve 41, the middle water pump 42, the feed water recirculation valve 44, the dehumidification recirculation valve 45, and the like is controlled.

  As shown in FIG. 3, the exhaust gas temperature sensor 38 is disposed between the dehumidifying part 32a and the drying filter 7a in the ventilation path 32, and exchanges heat with the laundry in the drum 13 so that the dehumidifying part 32a The air temperature after dehumidification is detected. On the other hand, the dehumidified water temperature sensor 39 is disposed in the ventilation path 32 at a position where the cooling water used for dehumidification and the water condensed and liquefied by dehumidification are mixed (that is, as dehumidified water). Detect the temperature. In the following description, the temperature detected by the exhaust temperature sensor 38 is called the exhaust temperature Ta, and the temperature detected by the dehumidified water temperature sensor 39 is called the dehumidified water temperature Tb.

  Next, characteristic control during the drying operation in the drum type washing and drying machine of the present embodiment will be described. In the drum type washing / drying machine of this example, in addition to using tap water supplied from the outside for dehumidification during the drying operation, the drum type washing / drying machine was used for the final rinse stored in the water storage tank 40. The later water (that is, the middle water) can be reused, and the middle water once used for dehumidification can be reused repeatedly, so that the cooling water used for dehumidification can be selected from tap water or middle water. I have to. When it is desired to use middle water for dehumidification in order to save water, the user sets the middle water dehumidification with the operation unit 52 before the start of the washing / drying operation. FIG. 20 is a flowchart of switching control between middle water dehumidification and tap water dehumidification during a drying operation.

  When the washing operation ends in the course of execution of the automatic operation and the operation moves to the drying operation, the control unit 50 determines whether or not dewatering in the middle water is selected at the start of the drying operation (step S10). And when middle water dehumidification is selected, the drying operation by dehumidification using middle water as cooling water is started (step S11). First, for example, it is determined whether or not supply of intermediate water is possible by checking whether or not sufficient water level is stored in the water storage tank 40 based on a detection signal from the water storage tank water level detection unit 55 ( Step S12). If it is determined that the medium water can be supplied, then the temperature Tr of the medium water is detected (step S13).

  For example, a temperature sensor may be provided so that the temperature Tr of the middle water is immersed in the water stored in the water storage tank 40. Here, the dehumidification recirculation valve 45 is opened and the middle water pump 42 is operated to open the ventilation path. It is assumed that the intermediate water is supplied into 32 and the water temperature of the intermediate water is detected based on the detection temperature of the dehumidified water temperature sensor 39. Then, it is determined whether or not the temperature Tr of the middle water detected at this time is within a predetermined temperature range (for example, 5 to 50 ° C.) (step S14). Execute dry operation using. Then, it is determined whether or not the drying operation has been completed based on predetermined conditions as will be described later (step S15). If the drying operation has not been completed, the process returns to step S12. Therefore, if there is no problem in the supply of the intermediate water and the water temperature, the drying operation is performed using the intermediate water as cooling water until the end of the drying operation. When the drying operation is completed, the control is terminated and the next process is started. Transition.

  When middle water dehumidification is not selected, the process proceeds from step S10 to S17, and a drying operation by dehumidification using tap water as cooling water is started, and it is first determined whether or not tap water can be supplied (step). S18). For example, whether or not tap water can be supplied can be determined based on the difference in temperature detected by the dehumidified water temperature sensor 39 before and after opening the cooling water valve 21b. The detected temperature before opening the cooling water valve 21b is the temperature of the air. Usually, when the tap water is supplied, the temperature changes. Therefore, it is determined that the tap water can be supplied when the temperature difference is a certain value or more. it can. However, since there may be almost no difference between the air temperature and the tap water temperature, if the temperature difference is less than a certain value, the drying operation is tried for a short time with the cooling water valve 21b opened, It may be determined whether or not the difference between the temperature detected by the dehumidified water temperature sensor 39 and the temperature detected by the exhaust temperature sensor 38 increases at that time. If tap water is not supplied during the trial of the drying operation, it can be determined that the supply of tap water is not possible because the temperature difference does not increase.

  If it is determined that tap water can be supplied, a drying operation using tap water as cooling water is executed. For example, when tap water is not supplied due to water shutoff or a water tap being closed, it is impossible to perform dehydration because dehumidification cannot be performed. In that case, the drying operation is stopped (step S20), for example, an abnormality is notified and the process proceeds to the next step.

  After starting the execution of the drying operation using tap water, it is determined whether or not the drying operation has been completed based on a predetermined condition as described later (step S19). If the drying operation has not been completed, the process proceeds to step S18. Return. Therefore, if there is no problem in the supply of tap water, the drying operation using the tap water as cooling water is performed until the end of the drying operation. When the drying operation is completed, the control is terminated and the process proceeds to the next step.

  Even if the intermediate water dehumidification is selected, the intermediate water dehumidification cannot be performed if there is no sufficient amount of water in the water storage tank 40. Further, when the water temperature is too high (for example, 50 ° C. or higher), a sufficient dehumidifying effect cannot be obtained. On the other hand, when the water temperature is too low (for example, 5 ° C. or lower), dehumidification is possible but the air after dehumidification As a result, the temperature of the water drops too much, and it becomes impossible to send heated air of sufficiently high temperature into the outer tub 10, so that the drying efficiency is greatly reduced. Therefore, when it is determined No in Steps S12 and S14 from the beginning of the drying operation or in the middle of the drying operation by dewatering with middle water, the drying operation by dewatering with middle water is stopped and the process proceeds to Step S17, and tap water is used. Automatically switch to dehumidification.

  Now, as described above, in this drum type washing and drying machine, there are a case where middle water is used for dehumidification during the drying operation (medium water dehumidification) and a case where tap water is used (tap water dehumidification), but the drying operation is terminated. In order to determine the timing to perform, the method of determining the dryness of the laundry is switched between dehumidification of medium water and dehumidification of tap water. The reason for such switching will be described later.

  First, the control during the drying operation when dehumidification is performed using tap water as cooling water will be described. When the drying operation is started, the control unit 50 controls the drum motor 17 to rotate forward and reverse at predetermined time intervals via the load driving unit 51 to rotate the drum 13 forward and backward at a low speed. As a result, the laundry is slowly stirred in the drum 13. Further, the drain valve 27 is closed and the water storage valve 41 is opened. Thereby, the water (dehumidified water) discharged from the outer tub 10 is stored in the water storage tank 40. Further, the fan motor 34 is operated at a predetermined rotational speed, and a heating current is supplied to the PTC heater 35. Thereby, the heated air heated by the PTC heater 35 is fed into the outer tub 10 and flows into the drum 13 that is rotationally driven. Further, the cooling water valve 21 b is opened, and supply of tap water into the air passage 32 is started. Thereby, the dehumidification part 32a begins to function. Therefore, when air containing water vapor discharged from the laundry is exchanged heat with the laundry in the drum 13, the air is dehumidified and the dry air returns to the fan 33.

  After the drying operation is started, the control unit 50 detects the exhaust temperature Ta by the exhaust temperature sensor 38 and detects the temperature Tb of the dehumidified water by the dehumidified water temperature sensor 39. Normally, the exhaust temperature Ta and the dehumidified water temperature Tb change with the passage of time of the drying operation as shown in FIG. That is, for a while from the start of the drying operation, most of the heat amount of the heated air is from the drum 13, the laundry, the inner wall of the outer tub 10, or other structures located in the ventilation path 32 through which the heated air passes. It is spent on the temperature rise and does not contribute much to the evaporation of the water contained in the laundry. At this time, both the exhaust temperature Ta and the dehumidified water temperature Tb rise with a relatively large temperature rise rate. This period is a preheating period.

  When the exhaust temperature Ta reaches around a predetermined temperature, the amount of heat applied by the PTC heater 35 and the amount of heat taken away by the laundry are almost in equilibrium, and both the exhaust temperature Ta and the dehumidified water temperature Tb have a gradient of the temperature increase rate. It becomes gentle and keeps almost constant for a while. This is the constant rate drying period. During this constant rate drying period, steam is actively generated from the laundry, and dehumidification in the dehumidifying part 32a is also actively performed. When the laundry is sufficiently moist and heat exchange with high-temperature air is sufficiently performed, the exhaust temperature Ta remains almost constant, but when the laundry is dried and heat exchange cannot be performed sufficiently, The exhaust temperature Ta tends to increase because the amount of heat lost to the exhaust gas decreases. On the other hand, since the amount of water vapor in the air decreases, the amount of heat given to the cooling water also decreases, and the dehumidified water temperature Tb tends to gradually decrease as a whole. This state is a transition from the constant rate drying period to the reduced rate drying period.

  When entering the rate-decreasing period, the exhaust temperature Ta tends to rise and the dehumidified water temperature Tb tends to fall, so the temperature difference between the two increases, and the change rate of the temperature difference suddenly shifts to the rate-decreasing period. growing. Since this temperature difference depends on the amount of heat taken by the laundry in the drum 13, the degree of drying of the laundry can be determined based on this temperature difference. Therefore, the control unit 50 obtains a temperature difference between the exhaust temperature Ta and the dehumidified water temperature Tb, determines that the predetermined drying degree has been reached when the temperature difference exceeds a predetermined threshold Th1, and ends the drying operation. . However, the threshold value Th1 is not constant here, and is set with an inclination so that the threshold value Th1 decreases as the drying operation time elapses. This prevents the drying operation time from becoming abnormally long. After the drying operation is completed, for example, a cool-down operation may be performed in which the heater 35 is turned off and only air blowing is continued. Also, in order to reduce drying deficiencies and uneven drying, control is performed to extend the drying operation time by an appropriate time from the time when the end timing of the drying operation as described above is detected, and then the operation shifts to cool-down operation. You may make it do.

  When performing dehumidification using tap water, since the temperature difference between the exhaust temperature Ta and the dehumidified water temperature Tb suddenly increases when the rate-decreasing drying period is entered as described above, it is determined whether or not a certain threshold value Th1 has been exceeded. There is little variation in the time direction when judging. In other words, this means that the variation in the timing of completion of the drying operation is reduced, so that it is avoided that the drying operation time becomes too short and the drying operation becomes insufficient, or the drying operation time becomes too long and excessive drying occurs. Can do.

  However, when the water temperature supplied from the water tap is considerably high, the temperature difference between the exhaust temperature Ta and the dehumidified water temperature Tb becomes small as a whole, and the drying of the laundry progresses considerably (for example, a drying rate of 100). In some cases, the temperature difference may not reach the threshold value Th1. In such a case, the temperature of the air in the drum 13 may become too high and damage the clothing. In order to prevent this, the control unit 50 performs determination of the drying operation end timing based only on the exhaust temperature Ta in addition to the determination of the drying operation end timing based on the temperature difference between the exhaust temperature Ta and the dehumidified water temperature Tb. And do it.

  The example shown in FIG. 21 is a case where the difference between the exhaust temperature Ta and the dehumidified water temperature Tb exceeds the threshold Th1 before the exhaust temperature Ta exceeds the predetermined threshold Th2, and in this case, the temperature difference is When the threshold Th1 is exceeded, the drying operation is terminated. On the other hand, as shown in FIG. 22, when the exhaust temperature Ta exceeds a predetermined threshold Th2 before the difference between the exhaust temperature Ta and the dehumidified water temperature Tb exceeds the threshold Th1, a predetermined degree of drying at that time It is determined that the temperature has reached the dry operation. The threshold Th2 has an inclination so as to decrease with the elapse of the drying operation time, but the inclination is larger than the threshold Th1. As a result, although the rate of increase in the exhaust temperature Ta during the rate-decreasing drying period is slower than the rate of increase in the difference between the exhaust temperature Ta and the dehumidified water temperature Tb, the drying operation is reliably completed with less variation in the time direction. Can be made.

  Next, the control at the time of the drying operation when dehumidification using middle water as cooling water is performed will be described. After the drying operation is started, the drum 13 is driven to rotate, the fan motor 34 is driven, and the heating current is supplied to the PTC heater 35 as in the case of dehumidification using tap water. However, in this case, instead of opening the cooling water valve 21b, the dehumidification recirculation valve 45 is opened and the middle water pump 42 is operated, so that middle water sucked from the water storage tank 40 is ventilated from the water sprinkling chamber 7. 32 is sprayed. Thereby, the dehumidification part 32a begins to function. Therefore, when air containing water vapor discharged from the laundry is exchanged heat with the laundry in the drum 13, the air is dehumidified and the dry air returns to the fan 33.

  In the case of tap water, the temperature of the supplied water is substantially constant during the drying operation, and it is assumed that the temperature does not increase greatly during the drying operation. On the other hand, when using the middle water as the cooling water, the middle water once used for dehumidification returns to the water storage tank 40 and is repeatedly used. Therefore, the temperature of the cooling water gradually increases as the drying operation proceeds. There is a big difference in that it goes. This is the same even during the rate-of-decreasing drying period, and basically the water temperature does not drop midway like when using tap water. FIG. 23 shows changes in the exhaust temperature Ta and the dehumidified water temperature Tb during the drying operation when middle water is used as the cooling water. As shown in this figure, the dehumidified water temperature Tb continues to rise throughout the preheating period, the constant rate drying period, and the reduced rate drying period. Therefore, even in the rate-decreasing drying period after the laundry is dried to some extent, the difference between the exhaust temperature Ta and the dehumidified water temperature Tb does not increase, and as described above, the determination of the degree of drying based on this temperature difference is not possible. Can not.

  Therefore, in the drum type washing / drying machine of this embodiment, when using middle water, an added value of the exhaust temperature Ta and the dehumidified water temperature Tb is obtained, and when the added value exceeds a predetermined threshold Th3, a predetermined degree of drying is obtained. The control for determining the end timing of the drying operation is changed so as to end the drying operation when it is determined that the value has been reached. As can be seen from FIG. 23, the dehumidified water temperature Tb continues to rise and the exhaust temperature Ta tends to increase at the rate of drying, so that the temporal change in the sum of the two values is simply the exhaust temperature. It becomes larger than the temporal change of Ta. Accordingly, the variation in the time direction when determining whether or not a certain threshold Th3 has been exceeded becomes small, the drying operation time becomes too short and the drying operation becomes too short, or the drying operation time becomes too long and becomes excessively dry. You can avoid that. It is to be noted that the threshold Th3 is also provided with an inclination that decreases with the passage of the drying operation time, similarly to the threshold Th1.

  Even when the intermediate water is used as cooling water, for example, when the temperature of the intermediate water stored in the water storage tank 40 is considerably low at the start of the drying operation, or when the ambient temperature is low, the exhaust temperature Ta and the dehumidification are performed. Even if the water temperature Tb and the added value become smaller as a whole and the laundry is dried considerably (for example, when the drying rate is close to 100%), the added value may not reach the threshold value Th3. Therefore, in this case as well, the control unit 50 determines the drying operation end timing based only on the exhaust temperature Ta in addition to the determination of the drying operation end timing based on the added value of the exhaust temperature Ta and the dehumidified water temperature Tb. Do it.

  The example shown in FIG. 23 is a case where the added value of the exhaust gas temperature Ta and the dehumidified water temperature Tb exceeds the threshold value Th3 before the exhaust gas temperature Ta exceeds the predetermined threshold value Th4. When the value exceeds the threshold Th3, the drying operation is terminated. On the other hand, as shown in FIG. 24, when the exhaust gas temperature Ta exceeds a predetermined threshold value Th4 before the added value of the exhaust gas temperature Ta and the dehumidified water temperature Tb exceeds the threshold value Th3, predetermined drying is performed at that time. It is determined that the degree has been reached and the drying operation is terminated. The threshold Th4 has an inclination so as to decrease as the drying operation time elapses, but the inclination is larger than the threshold Th3. As a result, the rate of increase in the exhaust gas temperature Ta during the reduced rate drying period is slower than the rate of increase in the added value of the exhaust gas temperature Ta and the dehumidified water temperature Tb. Can be terminated.

  By changing the method for determining the end timing of the drying operation between the case of using tap water as the dehumidifying cooling water and the case of using the middle water as described above during the drying operation, the drying of the laundry can be performed in any case. It is possible to accurately determine the degree and to achieve drying without excess or deficiency. In addition, it is possible to avoid an abnormally prolonged drying operation time.

  It should be noted that the above embodiment is an example of the present invention, and it is obvious that even if changes, modifications, and additions are made as appropriate within the scope of the present invention, they are included in the claims of the present application. For example, the above embodiment is a drum-type washing / drying machine, but the first to third inventions also apply to a washing / drying machine having a structure in which an inner tub is rotatably provided around a substantially vertical axis in a vertical outer tub. Can be applied. In addition, since the structure of the drying fan in the above embodiment is not directly related to washing, the second invention can be applied to a dryer that performs only drying.

1 is an external perspective view of a drum type washing and drying machine according to an embodiment of the present invention. The schematic side longitudinal cross-sectional view of the drum type washing-drying machine by a present Example. The schematic block diagram of the part relevant to drying operation in the drum type washing-drying machine by a present Example. The rear perspective view of the principal part inside the housing | casing of the drum type washing-drying machine of a present Example. The external perspective view (a) of the fan / heater unit in the drum type washing / drying machine of a present Example, and the perspective view (b) inside the state cut | disconnected by the horizontal surface of the position just under the upper wall surface. The external appearance perspective view of the impeller which is a component of the fan in the drum type washing-drying machine of a present Example. The upper surface top view of an impeller. The front top view of an impeller. FIG. 9 is a cross-sectional view taken along line A-A ′ in FIG. 8. The perspective view which shows the shape of the conventional impeller. The perspective view which shows the shape of the impeller which is an example of this invention. The perspective view which shows the shape of the impeller which is an example of this invention. The perspective view which shows the shape of the impeller which is an example of this invention. The perspective view which shows the shape of the impeller which is an example of this invention. The perspective view which shows the shape of the impeller which is an example of this invention. The perspective view which shows the shape of the impeller which is an example of this invention. The figure which shows the difference in the characteristic shape of each impeller by an example of this invention, and the measured value of noise and an air volume. The top view which looked at the discharge outlet from the fan chamber. The electric system block diagram of the principal part in the drum type washing-drying machine of a present Example. Flowchart of switching control between middle water dehumidification and tap water dehumidification during drying operation. The figure which shows the temperature change at the time of drying operation at the time of using a tap water as cooling water for dehumidification. The figure which shows the temperature change at the time of drying operation at the time of using a tap water as cooling water for dehumidification. The figure which shows the temperature change at the time of drying operation at the time of using middle water as cooling water for dehumidification. The figure which shows the temperature change at the time of drying operation at the time of using middle water as cooling water for dehumidification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Door 3 ... Water supply hose connection port 10 ... Outer tank 10a ... Outer tank front opening 12 ... Packing 13 ... Drum 14 ... Main shaft 17 ... Drum motor 21b ... Cooling water valve 29 ... Cooling water hose 31 ... Air exhaust Outlet 32 ... Ventilation path 32a ... Dehumidifying part 33 ... Fan 100 ... Casing 101 ... Lower casing 102 ... Upper casing 103 ... Standing wall 104 ... Intake port 105 ... Air passage 106 ... Discharge port 107 ... Fan chamber 108 ... Heater chambers 109, 111 ... Rib 110 ... discharge ports 330, 330a, 330b, 330c, 330d, 330e, 330f ... impeller 331 ... base plate 332 ... fixed plate 333 ... wing body 334 ... first wing body 335 ... second wing body 335a ... outer wing 335b ... Inner peripheral blade 34 ... Fan motor 35 ... PTC heater 36 ... Air supply port 37 ... Sprinkling chamber 37a ... Sprinkling hole 8 ... Exhaust temperature sensor 39 ... Dehumidified water temperature sensor 40 ... Water storage tank 41 ... Water storage valve 42 ... Middle water pump 43 ... Recirculation water channel 44 ... Water supply recirculation valve 45 ... Dehumidification recirculation valve 46 ... Dehumidification middle water channel 47 ... Return middle water channel 50 ... Control part 51 ... Load drive part 55 ... Water tank water level detection part

Claims (13)

An inner tub that is rotatably provided inside the outer tub and in which laundry is accommodated, an air passage connected to both ends of the outer tub, and an air flow disposed in the air passage are generated. In a washer / dryer comprising a blower fan for heating, a heater for heating air sent into the outer tub, and a dehumidifying unit for dehumidifying the moist air discharged from the outer tub, the fan is driven to rotate by a motor A centrifugal fan that sucks air in the axial direction on the inner peripheral side of the impeller and discharges air from the inner periphery to the outer peripheral side of the impeller,
The impeller includes a first wing body having only an outer peripheral blade portion having an arc shape when viewed from above, and an inner periphery extending from an inner peripheral edge of the outer peripheral blade portion having the same shape as the first wing body to the inner peripheral side. Two types of wing bodies, the second wing body having the side blade portions, are arranged in an annular shape so as to surround the rotating shaft and the second wing body is located at every integer number of the first wing body. A washing dryer characterized by. In a dryer having a drying chamber in which wet laundry is stored, and a ventilation path provided with a fan for blowing air and a heater for supplying heated air into the drying chamber, the fan is rotated by a motor. A centrifugal fan that sucks air in the axial direction on the inner peripheral side of the driven impeller and discharges air from the inner periphery to the outer peripheral side of the impeller,
The impeller includes a first wing body having only an outer peripheral blade portion having an arc shape when viewed from above, and an inner periphery extending from an inner peripheral edge of the outer peripheral blade portion having the same shape as the first wing body to the inner peripheral side. Two types of wing bodies, the second wing body having the side blade portions, are arranged in an annular shape so as to surround the rotating shaft and the second wing body is located at every integer number of the first wing body. A dryer characterized by.   The laundry according to claim 1, wherein the inner wing portion of the second wing body has an arc shape when viewed from above, and is connected to the outer wing portion that is arc shape when viewed from above in a substantially ε shape. A dryer or the dryer according to claim 2.   The washing / drying machine according to claim 1, or the drying machine according to claim 2, wherein the inner wing portion of the second wing body is linear when viewed from above.   The inner peripheral tip portion of the second wing body on the inner peripheral side blade portion facing the air inlet side formed in the fan casing is bent so as to fall toward the rotation direction side of the impeller. The laundry dryer according to claim 1, or the dryer according to claim 2.   The inner wing portion of the second wing body, at least a part of the inner rim side thereof, extends to a position corresponding to the inside of the opening of the air inlet formed in the fan casing. The washing dryer according to claim 1, or the dryer according to claim 2.   3. The washing / drying machine according to claim 1, wherein the inner wing portion of the second wing body has a substantially triangular shape having a bottom side on an air inlet side formed in the fan casing. Dryer.   The washing / drying machine according to claim 1, wherein the second wing body is disposed at equal angular intervals around the rotating shaft every two, one, or three of the first wing body. The dryer as described in. An inner tub that is rotatably provided inside the outer tub and in which laundry is accommodated, an air passage connected to both ends of the outer tub, and an air flow disposed in the air passage are generated. A fan for heating, a heater for heating the air sent into the outer tub, a dehumidifying section for dehumidifying the moist air discharged from the outer tub, and water used for washing and / or drying dehumidification And a dehumidifier for supplying dehumidified water to the dehumidifying unit, and a dehumidifying middle water supply means for supplying deionized water to the dehumidifying unit. Tap water supply means, and a washing and drying machine comprising:
An exhaust temperature detecting means that is disposed in the ventilation path and detects the temperature of air in the middle of being discharged from the outer tub and heated again by the heater;
Dehumidified water temperature detecting means for detecting the temperature of water after being used for dehumidification in the dehumidifying section;
A cooling water switching control means for controlling the dehumidifying middle water supply means and the dehumidifying tap water supply means so as to switch the cooling water supplied to the dehumidifying unit during drying operation between middle water and tap water;
A means for determining the dryness of the laundry in the inner tub based on the exhaust temperature by the exhaust temperature detecting means and the dehumidified water temperature by the dehumidified water temperature detecting means, the cooling water by the cooling water switching control means A drying operation control means for switching a method of determining the dryness of the laundry in conjunction with the switching;
A washing and drying machine comprising:   The drying operation control means, when middle water is used as cooling water for dehumidification, determines the dryness of the laundry based on the added value of the exhaust temperature and the dehumidified water temperature, and terminates the drying operation. The washing / drying machine according to claim 9, wherein the washing / drying machine is performed.   The drying operation control means performs end control of the drying operation based on an addition value of the exhaust temperature and the dehumidified water temperature when middle water is used as cooling water for dehumidification, and controls only the exhaust temperature. The washing / drying machine according to claim 10, wherein the end control of the drying operation is also executed in parallel.   When the tap water is used as the dehumidifying cooling water, the drying operation control means determines the dryness of the laundry based on the difference between the exhaust temperature and the dehumidified water temperature, and ends the drying operation. The washing and drying machine according to any one of claims 9 to 11, wherein When the tap water is used as the dehumidifying cooling water, the drying operation control means controls the end of the drying operation based on the difference between the exhaust temperature and the dehumidified water temperature, and based only on the exhaust temperature. The washing / drying machine according to claim 12, wherein the end control of the drying operation is also executed in parallel.

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