JP2012085836A - Washing and drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing and drying machine improved in blowing performance and noise performance of an air blower.SOLUTION: The washing and drying machine comprises: a rotary drum 53; a water tank 52; a motor 54; and an air blower 62 including an impeller 1, a casing 2 housing the impeller 1, and a driving fan motor 3 rotating the impeller 1. The impeller 1 includes a main plate 1a, an annular shroud 1b and a plurality of blades 1c. A front edge center 1h corresponding to substantially the center of a front edge 1d of each of the blades 1c is formed in a substantially arc shape protruding inward beyond an inside diameter of an inlet port 2a of the casing 2. A front edge upper portion 1g corresponding to an upper portion of the front edge 1d is formed by a part of an arc of a circle centering at a point where a center in a rib thickness of the inlet port 2a crosses a lower edge of the inlet port. A point where the front edge 1d is in contact with the main plate 1a is disposed in a position closer to an outer peripheral side than the front edge center 1h. Therefore, a length of an air channel disposed on a side of the main plate 1a of the blade 1c is thus made shorter than a length of an air channel disposed on a side of the shroud 1b, so that blowing performance may be improved and NZ noise may be reduced due to uniform distribution of blowing air velocity.

Description

  The present invention relates to a washing / drying machine that achieves improved air blowing performance and noise reduction in a drying operation.

  Conventionally, in this type of washer / dryer, a multi-blade turbo fan configuration has been proposed in order to reduce the noise of a centrifugal blower composed of an impeller, a casing that encloses the impeller, and a drive motor that rotates the impeller. (For example, refer to Patent Document 1).

  FIG. 9 and FIG. 10 are configuration diagrams of a blower of a conventional washer-dryer described in Patent Document 1, FIG. 9A is a plan view of a multiblade turbofan, and FIG. 10 (a) is a plan view of the blowing means, and (b) is a side view.

  9 and 10, the air blowing means includes a multi-blade turbo fan 104 including a main plate 101, an annular support plate (shroud) 102 disposed opposite to the main plate 101, and a large number of receding blades 103, and a multi-blade turbo fan. A casing 108 having a bell mouth-shaped suction port 105 on the side of a support plate (shroud) 102 that accommodates 104 and surrounding the multi-blade turbofan 104 with a spiral wall surface 107 with the f tongue 106 as a starting point. It is configured.

  On the other hand, in the air blowing means as described above, the efficiency and noise performance are good, but pressure and air volume are difficult to be generated, and it is necessary to increase the number of blades and increase the number of blades. A configuration in which the shape of the blade is three-dimensional has not been proposed (see, for example, Patent Document 2).

  FIG. 11 is a perspective view of a turbofan of a conventional blower described in Patent Document 2.

  In FIG. 11, the turbo fan is disposed between a hub plate 21 rotated by a motor (not shown), an annular shroud 22 provided at a position facing the hub plate 21, and the hub plate 21 and the shroud 22. And a plurality of blades 23. The blade 23 has a wing shape and the surface thereof is formed in a three-dimensional shape, and the front edge 24 which is an end portion on the inner peripheral side is on the rotational direction side with respect to the rear edge 25 which is an end portion on the outer peripheral side. Further, the rear edge 25a on the hub plate 21 side is arranged in the rotational direction more than the rear edge 25b on the shroud 22 side.

JP 2008-104478 A JP 2007-170331 A

  However, in the method of increasing the number of blades in order to improve the blowing performance as in the conventional configuration described in Patent Document 1, if the number of blades is increased more than necessary, the efficiency and noise performance are reduced, and the blowing performance is reduced. It becomes difficult to achieve both. In addition, in the conventional configuration described in Patent Document 2, there is a fear that the dynamic balance performance may be deteriorated by creating a complicated shape such as a three-dimensional shape blade, and an increase in production cost is concerned. .

  This invention solves the said conventional subject, and it aims at providing the washing-drying machine which has the air blower which improved the ventilation performance and reduced the noise at low cost.

  In order to solve the above-described problems, the present invention provides a washing and drying machine according to the present invention, wherein a rotating drum formed in a bottomed cylindrical shape, a water tank that rotatably includes the rotating drum, and the rotating drum are driven to rotate. A motor, and a blower that blows drying air into the water tank and the rotating drum are provided. The blower rotates the impeller, a casing that includes the impeller and includes a suction port and a discharge port, and the impeller. The impeller includes a main plate to which a rotation shaft is fixed, an annular shroud disposed to face the main plate, and a plurality of blades disposed between the main plate and the shroud. The blade has a front edge central portion of a substantially central portion of the front edge portion formed in a substantially arc shape projecting inward from the inner diameter of the suction port, and the front edge portion and the main plate Contacts The upper edge of the front edge is positioned on the outer peripheral side of the center of the front edge, and the upper part of the front edge is a substantially circular arc of a circle with a predetermined radius R centering on the intersection of the rib thickness center of the suction port and the lower end of the suction port It is a part formed. As a result, the air blowing performance is improved, the blown air velocity distribution from the shroud side of the blade to the main plate side is made uniform, the shroud side upper end of the blade inner peripheral front edge during rotation of the impeller, and the casing The interference sound with the suction port tip can be reduced, and thereby noise during operation can be reduced.

  The blower of the present invention does not have an impeller in a complicated shape, can improve the blowing performance at low cost, and can reduce annoying noise such as blade passing frequency sound.

The longitudinal cross-sectional view of the washing-drying machine in embodiment of this invention Schematic sectional view of the blower of the washer / dryer Partial enlarged sectional view showing the blade shape of the blower of the washing and drying machine External perspective view of the blower of the washer / dryer The block diagram seen from the suction side of the blower of the washing and drying machine Explanatory drawing of the flow of the wind inside the blower of a general washing and drying machine such as Patent Document 1 Noise frequency analysis diagram of the washing and drying machine in the embodiment of the present invention Noise frequency analysis diagram when the partial shape of the blower of the washing and drying machine in the embodiment of the present invention is experimentally abolished (A) The top view of the multiblade turbofan of the ventilation means of the conventional washing-drying machine described in patent document 1, (b) The side view (A) The top view of the ventilation means of the washing and drying machine, (b) The side view The perspective view of the turbofan of the conventional air blower described in patent document 2

  A first invention includes a rotating drum formed in a bottomed cylindrical shape, a water tank that rotatably includes the rotating drum, a motor that rotationally drives the rotating drum, a drying tank in the water tank and the rotating drum. The blower includes an impeller, a casing including the impeller and having a suction port and a discharge port, and a driving fan motor that rotates the impeller. Is composed of a main plate to which the rotation shaft is fixed, an annular shroud disposed opposite to the main plate, and a plurality of blades disposed between the main plate and the shroud, and the blade is substantially the front edge portion. The central portion of the front edge of the central portion is formed in a substantially arc shape protruding to the inner peripheral side from the inner diameter of the suction port, and the contact point of the front edge portion and the main plate is on the outer peripheral side of the front edge central portion. Located in the The outer diameter of the blade is increased by forming the upper part of the edge part of a substantially circular arc of a circle with a predetermined radius R centering on the intersection of the rib thickness center of the suction port and the lower end of the suction port. In addition, the air passage between the blades of the impeller can be made longer, the pressure conversion efficiency can be improved at low cost, the air blowing performance can be improved, and the air passage on the shroud side of the blade is made longer than the main plate side. As a result, the distribution of the blown wind speed can be made uniform, the noise performance can be improved, and the annoying noise such as the blade passing frequency sound can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description. Further, the present invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a washing / drying machine according to an embodiment of the present invention.

  In FIG. 1, a water tub 52 is swingably disposed inside a washing machine main body 51, and a rotary drum 53 is rotatably disposed in the water tub 52. It is rotationally driven by a motor 54 attached thereto.

  The washing / drying machine according to the present invention automatically controls the motor 54, the water supply system 55, the drainage system 56, the drying system 57, etc. shown in FIG. A so-called washing / drying machine having a function of performing a process and a drying process is configured.

  The water supply system 55 can supply water into the water tank 52 in a timely manner as shown by a solid line arrow a through a water supply path 75 by opening and closing a water supply valve (not shown), and can be supplied to the detergent container 58 using the water supply. The detergent previously put in by the user can be put into the water tank 52 together with tap water in a timely manner.

  The drainage system 56 is a drainage connected to a drainage port 71 formed in the lower part of the water tank 52 as indicated by a one-dot chain line arrow b when necessary at the end of the washing process, the end of the rinsing process, etc. by opening and closing the drain valve 59. It is installed in the filter case 67 through the pipe 60, collects lint, passes through a drainage filter 61 that can be removed from the outside, and then drains out of the machine via a connection hose 72 and a drain valve 59. It is like that. A drainage groove 76 is formed at the inner lower part of the side wall of the water tank 52 so as to be easily drained to the drainage port 71.

  The rotary drum 53 is directly connected to a motor 54 fixed to the outer bottom portion of the water tank 52 by a rotary shaft 63 arranged so as to be inclined substantially horizontally or downwardly from the horizontal direction. The clothes thrown into the rotating drum 53 from the section are stirred and washed. The open / close door 64 is sealed and opened through a sealing material 66 attached to the opening edge 65 of the water tank 52.

  The drying system 57 circulates the air in the water tank 52 and the rotating drum 53 by the blower 62 having the driving fan motor 3 as shown by a broken line arrow c in FIG. In the drying system 57, a filter (not shown) that collects and removes dust from the yarns, a dehumidifying part (not shown) that dehumidifies the introduced air after dust removal, and a high temperature that is exhausted to heat the dehumidified air. It has a heating part (not shown) etc. used as air.

  The mode such as the driving course and various functions are selected by inputting from the operation panel 73 provided at the upper front of the washing machine body 51, and the control means 74 displays the display means on the operation panel 73 based on the input information (FIG. When the operation start is set by an input setting means (not shown) on the operation panel 73, a water level detecting means (not shown) for detecting the water level in the water tank 52 is displayed. ) And the like, and the operation of the motor 54, drain valve 59, water supply valve (not shown), driving fan motor 3, etc. is controlled to perform operations such as washing, rinsing, dehydration, and drying processes. .

  FIG. 2 is a schematic cross-sectional view of the blower of the washing and drying machine in the embodiment of the present invention, FIG. 3 is a partially enlarged cross-sectional view showing the blade shape of the blower, and FIG. 4 is an external view of the impeller of the blower. A perspective view and FIG. 5 are the block diagrams which looked at the air blower from the suction side.

  2 to 5, the impeller 1 is included in a casing 2 having a bell mouth-like suction port 2 a and a discharge port 2 b, and a driving fan motor 3 that rotates the impeller 1 includes a drive shaft 5 in the casing 2. The impeller 1 is loosely fitted in the casing hole 2c provided in the housing, the impeller 1 is attached to the drive shaft 5, and the outer peripheral portion is interposed through the plurality of vibration isolators 4 so that the casing 2 and the driving fan motor 3 do not directly contact each other. The casing 2 is fixed with a plurality of screws 6.

  Here, the impeller 1 is made of aluminum and has a main plate 1a to which the rotation shaft is fixed, an annular shroud 1b disposed to face the main plate 1a, and a plurality of blades disposed between the main plate 1a and the shroud 1b. 1c.

  The shroud 1b is gradually formed upward toward the inner periphery, and the shroud inner peripheral portion 1e formed in the innermost peripheral portion is substantially cylindrical and has a substantially cylindrical suction port formed in the central portion of the casing 2. The tip end 1f of the shroud inner peripheral portion 1e is located above the lower end 2d of the suction port 2a.

  The front edge portion 1d on the inner peripheral side of the blade 1c is connected to the main plate 1a and the contact point C by the shroud 1b and the contact point B, and the front edge upper portion 1g on the shroud 1b side above the front edge portion 1d is connected to the suction port 2a. It is formed by a part of a circular arc of a circle with a radius R centering on the intersection O between the rib thickness center and the lower end 2d. Further, the front edge central portion 1h of the substantially central portion of the front edge portion 1d is formed in a substantially arc shape protruding toward the inner peripheral side, and is located further on the inner peripheral side than the inner diameter of the suction port 2a. The contact C between the front edge 1d and the main plate 1a is positioned on the outer peripheral side of the front edge central portion 1h, and the air path distance on the main plate 1a side of the blade 1c is made shorter than the shroud 1b side. In addition, as for the lower end part 2d of the suction inlet 2a, the corner | angular part of the rib thick part is formed on the circular arc.

  The operation and action of the washing / drying machine configured as described above will be described below.

  FIG. 6 is a diagram showing the flow of air inside a blower of a general washing and drying machine including Patent Document 1, but, as shown in FIG. 6, in the drying process, by the operation of the drive fan motor 3, Since the wind that has entered from the suction side is suddenly bent substantially at right angles toward the blade 32, the blade 32 on the shroud 31 side that can be bent more rapidly has a substantially central portion of the front edge portion 34. Since the lower part protrudes to the inner peripheral side, the wind is less likely to flow compared to the main plate 33 side. For this reason, the blown air speed is non-uniform, and a flow A is generated in which the air once discharged from the rear edge 35 on the main plate 33 side of the blade 32 flows to the shroud 31 side of the blade 32, which increases noise. It becomes the factor of.

  In the blower of the washing and drying machine according to the embodiment of the present invention, the front edge central portion 1h of the substantially central portion of the front edge portion 1d of the blade 1c is formed in a substantially arc shape protruding toward the inner peripheral side, and the front edge portion 1d is formed. And the contact C between the main plate 1a and the main plate 1a side of the blade 1c are shorter than the shroud 1b side by positioning the contact C between the main plate 1a and the front edge central portion 1h. Begins to flow. Thereby, the blown air speed can be made uniform.

  Further, the front edge upper portion 1g of the front edge portion 1d is formed by a part of a circular arc having a radius R centering on the intersection O between the rib thickness center portion of the suction port 2a and the lower end portion 2d, that is, Since the front edge is shaped like a hollow, the distance between the front edge upper portion 1g and the lower end portion 2d of the suction port 2a is widened, thereby increasing the blade passing frequency sound (NZ sound). Can be prevented.

  FIG. 7 is a noise frequency analysis diagram of the washing / drying machine according to the embodiment of the present invention. FIG. 8 is a graph showing experimental results of the above-mentioned leading edge punching at 28 blades and a drive rotational speed of 9000 rpm. FIG. 8 is a noise frequency analysis diagram when abandoned, but in FIG. 8, a remarkable NZ sound is observed in the vicinity of about 4200 Hz surrounded by a broken line. Thereby, it can be demonstrated that the increase in the NZ sound can be prevented by the shape of the front edge upper portion 1g of the front edge portion 1d in the present embodiment.

  In the present embodiment, the washing / drying machine has been described. However, a drying machine having no washing function may be used.

  As described above, in the present embodiment, it is possible to increase the air passage between the blades of the impeller without increasing the outer diameter of the blade of the impeller of the blower, thereby improving the pressure conversion efficiency at low cost. In addition to improving the air blowing performance, by making the air passage on the shroud side of the blade longer than the main plate side, it is possible to make the blown air velocity distribution uniform, improve the noise performance, and further improve the blade passing frequency. Annoying noise such as sound (NZ sound) can be reduced.

  As described above, the washing / drying machine according to the present invention is improved in blowing performance and noise performance at low cost, and is used for other washing / drying machines or clothes drying machines having blowing means of a drying device. Applicable to.

DESCRIPTION OF SYMBOLS 1 Impeller 1a Main plate 1b Shroud 1c Blade 1d Front edge 1g Front edge upper part 1h Front edge center 2 Casing 2a Suction port 2b Discharge port 3 Driving fan motor 52 Water tank 53 Rotating drum 54 Motor 62 Blower

Claims (1)

A rotating drum formed in a cylindrical shape with a bottom; a water tank that rotatably includes the rotating drum; a motor that rotationally drives the rotating drum; and a blower that blows drying air into the water tank and the rotating drum. The blower includes an impeller, a casing that includes the impeller and includes a suction port and a discharge port, and a driving fan motor that rotates the impeller, and the impeller has a fixed rotation shaft. And a plurality of blades disposed between the main plate and the shroud, wherein the blade is a front edge center of a substantially central portion of the front edge portion. And forming the contact portion between the front edge portion and the main plate on the outer peripheral side with respect to the front edge central portion, and forming the front portion The top of the edge Washing and drying machine, characterized in that formed in substantially an arc of part of a circle of predetermined radius R centered on the intersection of the rib thickness center and the suction port lower end of the suction port.

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