JP2022056643A - Blower and washing machine equipped with the same - Google Patents

Abstract

To provide a blower capable of reducing noise without lowering efficiency.SOLUTION: A blower has a rotary shaft 101 that is rotatably provided on an electric motor 100, a centrifugal impeller 300 that is provided on the rotary shaft 101, a bell mouth 57a that is provided at a suction opening 302 of the centrifugal impeller 300, a diffuser 400 that is provided downstream the centrifugal impeller 300, and is composed of a plurality of diffuser vanes 401 disposed in a circumferential direction, a fan casing 52 and a fan cover 51 storing the centrifugal impeller 300 and the diffuser 400, and a non-circular projecting portion 600 that is provided on an inner side of the fan cover 51 and on an outer side in a diametrical direction of the suction port 57 of the fan cover 51.SELECTED DRAWING: Figure 6

Description

The present invention relates to a blower and a washing machine equipped with the blower.

The blower uses an electric motor to rotate the impeller to create an air flow. The air flowing in from the suction port of the blower is boosted and accelerated by the impeller, and decelerated in the stationary flow path, so that the kinetic energy of the inflowing air is converted into pressure energy and the pressure rises. In order to obtain a highly efficient blower, a static flow path that performs good pressure recovery is important. On the other hand, a blower equipped with a blower in a washing machine is required to increase the air volume in order to shorten the drying operation time and reduce wrinkles during drying. Of the methods for increasing the air volume in the limited space inside the housing, increasing the rotation speed of the blower is the most effective method. On the other hand, when the rotation speed of the blower is increased, the noise also increases. In particular, the peak noise caused by the number of blades of the impeller or the number of blades of the diffuser provided downstream thereof is a high frequency of 1 kHz or more, which is very jarring to the ear.

Therefore, it has been necessary for the blower mounted on the washing machine to have both a small size and a large air volume and a low noise level.

There are inventions described in Patent Documents 1 and 2 that realize the noise reduction of the blower.

Patent Document 1 is a patent relating to a blower mounted on an electric vacuum cleaner, but in order to reduce noise, a resonator is provided in a stationary flow path portion to reduce peak noise at a specific frequency.

On the other hand, in the invention described in Patent Document 2, by providing a plurality of holes for communicating the pressure surface and the negative pressure surface at the trailing edge of the blade of the impeller, the wake area of the blade of the impeller can be reduced and the blade noise can be reduced. Have been described.

Japanese Unexamined Patent Publication No. 2020-139408 Japanese Unexamined Patent Publication No. 2020-79567

In the blower of Patent Document 1, the frequency at which noise can be reduced is determined by the design of the resonator. Therefore, if the rotation speed of the blower changes and the frequency of peak noise changes, the resonator does not function. There is no effect on noise. Further, since the resonator is provided in the flow path of the blower, there is a problem that the resonator itself affects the fluid performance and the efficiency of the blower is lowered.

Further, in Patent Document 2, since the force acting from the blade to the fluid is reduced by providing a hole in the blade, the efficiency of the impeller is lowered, and it is necessary to sacrifice the performance of the blower in order to reduce noise. there were.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a blower capable of reducing noise without lowering efficiency.

In order to achieve the above object, the blower of the present invention includes an electric motor, a rotating shaft rotatably provided in the conductive machine, an impeller provided on the rotating shaft, and a bell mouth provided in a suction portion of the impeller. A diffuser composed of a plurality of vanes arranged downstream of the impeller and arranged in the circumferential direction, a fan casing and a fan cover for accommodating the impeller and the diffuser, the inside of the fan cover, and suction of the fan cover. It is configured to have a non-circular protrusion provided on the radial outer side of the mouth.

According to the present invention, it is possible to provide a blower capable of reducing noise without reducing efficiency.

It is a vertical sectional view which shows the washing machine which carried out the blower of embodiment. It is an external perspective view which shows the blower of an embodiment. It is an exploded perspective view when the blower of an embodiment is seen from the suction side. It is an exploded perspective view when the blower of an embodiment is seen from the motor side. It is a vertical sectional view of the blower of an embodiment. It is a figure which shows the inside of the fan cover of the blower of an embodiment.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional view showing a washing machine on which the blower of the embodiment is mounted. In the following, a vertical washer-dryer will be described as an example, but it can also be applied to a drum-type washer-dryer having a laundry loading / unloading port formed on the front side.

As shown in FIG. 1, the washing machine S includes an outer frame 1 which is a housing, an outer tub 2 for storing washing water, a rotary tub 3, a drive motor 10, a blower 22 and the like. The outer tank 2 is built in the outer frame 1 and is vibration-proof supported by the outer frame 1. The rotary tank 3 is a washing / dehydrating tank for accommodating laundry such as clothes to be washed and dried, and is provided inside the outer tank 2. Further, the rotary tank 3 is rotatably supported in the outer tank 2.

At the bottom of the rotary tank 3, a stirring blade 4 for stirring and washing the laundry is rotatably provided. The stirring blade 4 is operated to repeat forward rotation / reverse rotation during the washing operation and the drying operation. Further, the stirring blade 4 rotates at high speed together with the rotary tub 3 during the dehydration operation to dehydrate the water contained in the laundry in the rotary tub 3.

The drive motor 10 is provided in the outer frame 1 and drives the stirring blade 4 and the rotary tank 3 to rotate. Further, as the drive motor 10, for example, a DC brushless motor is used. The DC brushless motor is controlled by a vector. In the present embodiment, the stirring blade 4 and the rotary tank 3 are directly rotationally driven by the drive motor 10, but may be driven by using a belt or the like (not shown).

Further, an outer lid 5 is provided on the upper portion of the outer frame 1. The outer lid 5 is provided on a top cover 6 provided on the upper part of the outer frame 1 so as to be openable and closable. An inner lid 34 is provided on the upper portion of the outer tank 2 so as to be openable and closable. By opening the outer lid 5 and the inner lid 34, laundry can be taken in and out of the rotary tub 3.

Further, in the outer frame 1, a water supply unit 7 is provided on the back side of the top cover 6. The water supply unit 7 has a water supply box (not shown) having a plurality of water channels inside, and supplies tap water or bath water from the water supply hose connection port 8 to the outer tank 2. Further, on the front side of the top cover 6, a detergent and finishing agent charging device 35 is provided. The detergent and finishing agent are poured between the outer tank 2 and the rotary tank 3 by the charging hose 36.

Further, the washing machine S is provided with a drying mechanism 9. The drying mechanism 9 circulates and dehumidifies the drying air for drying the laundry in the rotary tub 3. Further, the drying mechanism 9 is mostly occupied by the drying air circulation path. The drying air circulation passage includes a bottom circulation passage 20 connected so as to communicate with the bottom of the outer tank 2, and a dehumidifying vertical passage 21 extending upward from the bottom circulation passage 20.

The suction side of the blower 22 is connected to the upper side of the dehumidifying vertical passage 21. The discharge side of the blower 22 is connected so as to communicate with the return connection circulation path 25. Further, a drying filter 45 is arranged between the blower 22 and the dehumidifying vertical passage 21 to prevent foreign matter from flowing into the blower 22. The details of the blower 22 will be described later.

The return connection circulation path 25 has an upper bellows hose 23, and is connected so as to communicate with the upper part of the outer tank 2 via the upper bellows hose 23. The bottom circulation path 20 also has a lower bellows hose 26, and is connected to the bottom of the outer tank 2 via the lower bellows hose 26.

The lower bellows hose 26 is connected to the bottom drop portion 31 of the outer tank 2. The bottom drop portion 31 communicates with the washing water drainage channel 42 and the washing water circulation water channel 43 via the lower communication pipe 41. A drain valve 44 is provided in the washing water drainage channel 42. A foreign matter removing trap 32 is provided in the washing water circulation water channel 43.

The drain valve 44 is closed during the washing operation and the drying operation. Further, the drain valve 44 is opened at the time of draining the washing water, and the washing water and the rinsing water collected in the outer tub 2 are discharged from the washing water drainage channel 42 to the outside (outside the machine) of the washing machine S.

The washing water circulation water channel 43 is connected to the washing water circulation water vertical water channel 46. The washing water circulating water vertical water channel 46 rises along the outer surface of the outer tub 2 and extends to the upper side of the rotary tub 3 so as to communicate with the washing thread waste removing device 33 provided on the upper side of the rotary tub 3. Be connected.

The washing water and rinsing water collected in the outer tub 2 flow through the washing water circulating water vertical water channel 46 and are poured from the washing thread debris removing device 33 into the rotary tub 3. Since washing and rinsing are performed while this spraying and water injection continues, washing and rinsing are performed with a small amount of water.

Further, the washing machine S includes a water level sensor 47 that detects the water level of the washing water and the rinsing water accumulated in the outer tub 2. An air trap 50 is provided near the bottom of the outer tank 2. An air tube 49 is connected so as to communicate with the air trap 50. A water level sensor 47 is connected to the upper end of the air tube 49 so as to communicate with the upper end. The water level sensor 47 senses the fluctuation of the water level in the outer tank 2 to detect the water level.

Further, in the washing machine S, the centrifugal impeller 300 (see FIG. 2) of the blower 22 rotates, so that the drying air circulates in the rotary tub 3 and dries the laundry in the rotary tub 3. Further, the electric heater 24 (see FIG. 3) of the blower 22 reheats the drying air in which the water is condensed in the dehumidifying region and flows through the rotary tank 3, so that the water in the laundry is further evaporated. The laundry is dried by repeating this water removal in the circulation of the drying air.

FIG. 2 is an external perspective view showing the blower of the embodiment.

As shown in FIG. 2, the blower 22 includes a fan cover 51, a fan casing 52, an electric motor 100, a centrifugal impeller 300, a diffuser 400 (see FIG. 3), and an electric heater 24 (see FIG. 3). .. When the blower 22 is mounted on the washing machine S (see FIG. 1), for example, the fan cover 51 of the blower 22 is installed in the outer frame 1 (see FIG. 1) so as to face substantially downward.

The fan cover 51 is formed with a suction port 57 and an discharge port 58. The suction port 57 is connected to the dehumidifying vertical passage 21 (see FIG. 1) via the drying filter 45 (see FIG. 1). The discharge port 58 is connected to the return connection circulation path 25 (see FIG. 1) of the drying air circulation path.

FIG. 3 is an exploded perspective view of the blower of the first embodiment as viewed from the bell mouth side.

As shown in FIG. 3, the fan cover 51 has an elongated shape in one direction, a suction port 57 is formed on one side in the longitudinal direction, and a discharge port 58 is formed on the other side in the longitudinal direction. The suction port 57 is a circular through hole and faces the center of the suction opening 302 (suction portion) of the centrifugal impeller 300. Further, the suction port 57 is provided with a bell mouth 57a.

The discharge port 58 is a circular through hole and is located on the downstream side of the electric heater 24. Further, the diameter of the discharge port 58 is formed to be larger than the diameter of the suction port 57. Further, the suction port 57 and the discharge port 58 are formed so as to face substantially the same direction.

Further, the fan cover 51 is formed around the suction port 57 with a substantially annular protrusion 51a protruding toward the bell mouth 57a side in the axial direction Ax. The axial direction Ax means the direction in which the rotary shaft 101 rotatably provided in the motor 100 extends. Further, the fan cover 51 has a substantially rectangular protrusion 51b formed at a position where the electric heater 24 is provided.

Further, on the peripheral edge portion of the fan cover 51, screw fixing portions 91 screw-fixed to the fan casing 52 are formed at a plurality of locations.

The fan casing 52 has a shape corresponding to the fan cover 51. When the fan casing 52 and the fan cover 51 are combined, a plurality of diffusers provided between the fan cover 51 and the fan casing 52 downstream of the centrifugal impeller 300 and the centrifugal impeller 300 and arranged in the circumferential direction. The space in which the diffuser 400 and the electric heater 24 configured by the vane 401 (vane) are arranged is formed. That is, the centrifugal impeller 300, the diffuser 400, and the electric heater 24 are housed in the fan casing 52 and the fan cover 51.

Further, the fan cover 51 and the fan casing 52 are provided with a scroll flow path 70 provided on the radial outer side of the centrifugal impeller 300, and the scroll flow path 70 includes a bell mouth 557 and an electric motor 100 in the direction of the rotation shaft 101. It is provided between.

Of the scroll flow paths 70, the scroll flow path 70A is formed on the back side (motor 100 side) where the diffuser 400 is arranged. The flow path width on the tongue end portion 71 side is formed to be narrow, and the flow path width is gradually widened from the tongue end portion 71 in the clockwise direction. The tongue end portion 71 is the starting point of the scroll flow path 70A. The outlet of the scroll flow path 70A is the casing discharge port 59.

Further, the fan casing 52 is formed with an introduction path 72a for introducing air from the scroll flow path 70A to the electric heater 24. The electric heater 24 includes a large number of fins, flows out of the scroll flow path 70A, and heats the air that has passed through the introduction path 72a. The introduction path 72a is configured so that the flow path width widens toward the electric heater 24. More specifically, the introduction path 72a is configured to extend to substantially the same width as the width of the heating portion (the portion in which the fins 24a are arranged) of the electric heater 24. By combining the fan casing 52 and the fan cover 51, an introduction path 72 having a shape along the rectangular heating portion of the electric heater 24 is formed.

Further, in the fan casing 52, a flow path 77 communicating with the discharge port 58 of the fan cover 51 is formed on the downstream side of the electric heater 24. The bottom surface 77a of the flow path 77 is inclined so as to rise toward the discharge port 58.

Further, the fan casing 52 has a shape that protrudes in the width direction so that the position separated from the heating portion (the portion of the fin 24a) of the electric heater 24 does not interfere with the air flow.

Further, in the fan casing 52, a shaft insertion hole 80 into which the rotary shaft 101 of the electric motor 100 is inserted is formed in the center of the scroll flow path 70A. Further, on the outer peripheral edge portion of the fan casing 52, a screw insertion portion 92 through which a screw (not shown) is inserted is formed at a position corresponding to the screw fixing portion 91 of the fan cover 51.

Further, in the fan casing 52, screw holes 93 for fixing the diffuser 400 to the fan casing 52 are formed at a plurality of locations (four locations in the present embodiment) between the shaft insertion hole 80 and the scroll flow path 70. ing. These screw holes 93 are formed so as to surround the shaft insertion hole 80. Further, the fan casing 52 has a circular recess 93a formed on the peripheral edge of the screw hole 93.

Further, the fan casing 52 is formed with a fan casing side groove portion 94A (concave groove portion) on the radial outer peripheral side of the screw hole 93. The fan casing side groove portion 94A is formed in an annular shape between the suction port 57 and the scroll flow path 70A.

The electric motor 100 has a rotating shaft 101 coupled to the centrifugal impeller 300 at the center in the radial direction, and is attached to the fan casing 52. Further, the motor 100 has a rotor (rotor) fixed to the rotary shaft 101, a stator (stator) provided around the rotor, and a bearing that rotatably supports the rotary shaft 101. Further, the motor 100 has a substantially columnar case 102 that houses a rotor, a stator, and a bearing.

The centrifugal impeller 300, which is an impeller, is provided on the rotating shaft 101, and is configured by combining a shroud plate 301, a hub plate 311 and blades 321. The shroud plate 301 has a circular suction opening 302 formed in the center in the radial direction. The hub plate 311 is formed with a shaft hole (not shown) for fixing the rotating shaft 101. The blade 321 is configured such that the shroud plate 301 and the hub plate 311 are sandwiched from both sides in the axial direction Ax.

Further, in the centrifugal impeller 300, the inner diameter end portion of the blade 321 is located radially outside the suction opening 302 (see FIG. 3). Further, the centrifugal impeller 300 is configured such that the outer diameter end portion of the blade 321 substantially coincides with the outer peripheral edge portion of the shroud plate 301 and the outer peripheral edge portion of the hub plate 311.

In the present embodiment, the closed type centrifugal impeller 300 having the shroud plate 301 has been described as an example, but an open type centrifugal impeller in which the hub plate 311 and the blade 321 are integrally molded with resin may be used. As a result, the number of parts can be reduced and the cost can be reduced. In addition, resin molding facilitates three-dimensionalization and improves efficiency. The three-dimensionalization is to form the blade by further twisting it. This makes it possible to further improve efficiency.

Further, in the present embodiment, a turbofan having a rearward blade will be described as an example, but a sirocco fan having a forward blade may be applied. Further, the shape of the impeller is not limited to the centrifugal type, and may be a mixed flow type. By adopting the diagonal flow type, the outer diameter of the impeller can be miniaturized, and the blower 22 can be miniaturized.

FIG. 4 is an exploded perspective view of the blower according to the embodiment of the present invention when viewed from the motor side.

As shown in FIG. 4, in the fan cover 51, a substantially annular scroll flow path 70B is formed on the back side of the annular protrusion 51a (see FIG. 3). The scroll flow path 70B is formed at a position facing the scroll flow path 70A, and is configured so that the flow path width gradually widens from the tongue end portion 71B toward the downstream side. The tongue end portion 71B is the starting point of the scroll flow path 70B, and has a shape that overlaps with the tongue end portion 71A of the fan casing 52 in the axial direction Ax.

Further, the fan cover 51 has a scroll flow path 70B formed on the bell mouth 57a side on which the diffuser 400 is arranged. The scroll flow path 70B is configured such that the flow path width on the tongue end portion 71B side is narrow and the flow path width gradually increases from the tongue end portion 71B in the counterclockwise direction. The tongue end portion 71A is the starting point of the scroll flow path 70A. The outlet of the scroll flow path 70A is the casing discharge port 59.

Further, the fan cover 51 is formed with an introduction path 72b for introducing air from the scroll flow path 70B to the electric heater 24 (see FIG. 3). The introduction path 72b of the fan cover 51 is also configured so that the flow path width widens from the tongue end portion 71B to the downstream, similarly to the introduction path 72a of the fan casing 52. By combining the introduction path 72a of the fan casing 52 and the introduction path 72b of the fan cover 51, the introduction path 72 having a shape along the rectangular heating portion of the electric heater 24 is formed.

Further, on the inside of the fan cover 51, a fan cover side groove portion 94B is formed on the radial outside of the suction port 57, that is, between the suction port 57 and the scroll flow path 70B. The fan cover side groove portion 94B is an annular groove portion.

Further, the bell mouth 57a is screwed and fixed from the inside of the fan cover 51. The seal member 60 is provided in the bell mouth 57a and is arranged so as to face the tip of the suction opening 302 (see FIG. 3) of the centrifugal impeller 300.

Further, inside the fan cover 51, a non-circular protrusion 600 is provided between the suction port 57 and the fan cover side groove portion 94B.
FIG. 5 is a vertical cross-sectional view of the blower in the VV cross section shown in FIG.

As shown in FIG. 5, a bell mouth 57a (bell mouth) is formed at the suction port 57 of the fan cover 51.

A scroll flow path 70 is formed on the outer peripheral side of the diffuser 400. The scroll flow path 70 has a scroll flow path 70A formed on the motor 100 side and a scroll flow path 70B formed on the bell mouth 57a side (suction port 57). In other words, the scroll flow path 70 is formed so as to surround both sides of the axial Ax in the outer peripheral edge portion of the diffuser 400 and the outer peripheral side surface of the diffuser 400.

The case 102 of the electric motor 100 is formed with an annular recess 102a around the rotating shaft 101 so that the concave surface faces the fan casing 52 side. A vibration-proof rubber 105 (elastic member) is provided in the recess 102a. The electric motor 100 is attached to the fan casing 52 via the anti-vibration rubber 105. As a result, the vibration generated from the motor 100 can be alleviated.

The non-circular protrusion 600 provided inside the fan cover 51 projects from the fan cover 51 toward the shroud plate 301 of the centrifugal impeller 300. As a result, in the space 601 provided between the centrifugal impeller 300 and the fan cover 51, the distance between the fan cover 51 and the shroud plate 301 in the Ax direction is changed by the protrusion 600. The space 601 provided between the centrifugal impeller and the fan cover 51 is a so-called leak flow path in which the flow boosted by the centrifugal impeller 300 in the blower 22 leaks and returns to the suction opening 302 of the centrifugal impeller 300. Corresponds to.

FIG. 6 is a diagram showing the inside of the fan cover.

As shown in FIG. 6, it is provided inside the fan cover 51 and outside the suction port 57 of the fan cover 51 in the radial direction, and specifically, between the suction port 57 of the fan cover 51 and the groove portion 94B on the fan cover side. Is provided with a non-circular protrusion 600.

The non-circular protrusion 600 is a protrusion that protrudes on the fan cover 51 in the direction of the rotation axis 101 in the leakage flow path existing between the fan cover 51 and the centrifugal impeller 300, which is an impeller, and is a scroll flow. As the cross-sectional area of the flow path of the road 70 changes toward the rotation direction of the centrifugal impeller 300, the radial distance of the outer edge 602 of the non-circular protrusion 600 from the rotation shaft 101 changes.

More specifically, the distance of the outer edge 602 from the axis Ax (the radial distance from the rotation axis 101) is the tongue end portion 71 (71A, 71B) in which the flow path cross-sectional area of the scroll flow path 70 is the tongue portion. It becomes shorter as it becomes larger in the rotation direction of the centrifugal impeller 300 at the base point.

Further, the distance between the outer edge 602 and the outer wall of the scroll flow path 70 becomes longer in the rotation direction of the centrifugal impeller 300 starting from the tongue end portion 71 which is the tongue portion. That is, as the flow path cross-sectional area increases in the rotation direction of the centrifugal impeller 300 starting from the tongue end portion of the scroll flow path 70, the radial distance of the outer edge of the protrusion 600 from the rotation axis 101 increases (becomes longer). ).

In the blower 22 configured in this way, the centrifugal impeller 300 rotates in the W direction (see FIG. 3), so that air is sucked from the suction opening 302 through the bell mouth 57a and then the centrifugal impeller 300. Air (fluid) is discharged from the outer circumference. The discharged air passes through the diffuser 400 and flows into the substantially triangular communication portion 420A on the motor 100 side and the communication portion 420B on the bell mouth 57a side in different directions. Then, it flows into the scroll flow paths 70A and 70B provided on both sides of the diffuser 400 in the axial direction Ax.

The air flowing through the scroll flow paths 70A and 70B passes through the casing discharge port 59 and is introduced into the introduction paths 72a and 72b.

The flow leaked from the connection portion between the centrifugal impeller 300 and the diffuser 400 flows into the space 601 provided between the centrifugal impeller 300 and the fan cover 51. The inflowing flow is accompanied by pressure pulsations caused by interference between the blades 321 of the rotating centrifugal impeller 300 and the diffuser vanes 401 of the stationary diffuser 400. This pressure pulsation affects the blade sound of the blower 22. This pressure pulsation flows into space 601 and causes high pressure fluctuations in space 601. The non-circular protrusion 600 can reduce the amplitude of the pressure fluctuation generated in the space 601 and reduce the blade noise.

Generally, the pressure in the scroll flow path 70 has a distribution in the rotation direction of the centrifugal impeller 300. At this time, the vicinity of the tongue end portion 71 is the highest, and the pressure gradually decreases toward the rotation direction of the centrifugal impeller 300. Therefore, the amplitude of the pressure fluctuation is the largest in the vicinity of the tongue end portion 71 (71A, 71B), and the amplitude also gradually decreases in the rotation direction of the centrifugal impeller 300. Therefore, the pressure fluctuation flowing into the space 601 is the largest in the vicinity of the tongue end portion 71. In order to suppress this pressure fluctuation, the non-circular protrusion 600 near the tip of the tongue increases the distance of its outer edge 603 from the axis Ax.

On the other hand, if the circular protrusion 600 having a constant outer edge 603 is provided in the space 601, the same pattern of pressure fluctuation occurs in the circumferential direction. It is effective to provide a non-circular protrusion as in the present invention in order to break the pressure fluctuation of the same pattern. At that time, by increasing the distance of the outer edge 603 from the axis Ax near the tip of the tongue described above, fluctuations are suppressed against high pressure fluctuations.

In the present invention, it is possible to reduce the blade noise by suppressing the pressure fluctuation generated in the impeller and the diffuser flow path, which are the main sources of the blade noise of the blower. Further, since the holes and protrusions are not provided in the flow path portion of the impeller or the diffuser flow path, the noise can be reduced without lowering the efficiency.

Further, the blower 22 of the first embodiment is provided in the washing machine S. Thereby, the washing machine S with low noise can be provided.

1 Outer frame 2 Outer tank 3 Rotating tank 22 Blower 51 Fan cover 52 Fan casing 57 Suction port 57a Bellmouth 58 Outlet port 59 Casing discharge port 70, 70A, 70B Scroll flow path 71A, 71B Tongue end (tongue part)
72, 72a, 72b Introductory path 94A Fan casing side groove 94B Fan cover side groove 100 Motor 101 Rotating shaft 300 Centrifugal impeller (impeller)
302 Suction opening (suction part)
400 Diffuser 400a Bottom plate (side wall)
400c diffuser outer bottom surface (side wall)
401, 401A Diffuser vane (vane)
402 Trailing edge 412 Leading edge 420A, 420B, 420C Communication part 460 Diffuser lid part (side wall)
463, 463A Closure 452,462 Rib Ax Axial S Washing machine

Claims (8)

With an electric motor
A rotating shaft rotatably provided on the motor,
The impeller provided on the rotating shaft and
A bell mouth provided in the suction portion of the impeller and
A diffuser provided downstream of the impeller and composed of a plurality of vanes arranged in the circumferential direction,
A fan casing and a fan cover for accommodating the impeller and the diffuser,
A blower having a non-circular protrusion provided inside the fan cover and radially outside the suction port of the fan cover. The blower according to claim 1.
The blower is characterized in that the protrusion is a protrusion protruding in the rotation axis direction on the fan cover in a leakage flow path existing between the fan cover and the impeller. The blower according to claim 1 or 2.
A blower comprising a scroll flow path provided on the radial outer side of the impeller of the diffuser flow path. The blower according to claim 3.
A blower characterized in that the scroll flow path is provided between the bell mouth and the electric motor in the direction of the rotation axis. The blower according to claim 3 or 4.
A blower characterized in that the radial distance of the outer edge of the protrusion from the rotation axis changes as the scroll flow path changes in the flow path cross-sectional area toward the rotation direction of the impeller. The blower according to claim 5.
A blower characterized in that the radial distance of the outer edge of the protrusion from the rotation axis increases as the flow path cross-sectional area increases in the rotation direction of the impeller starting from the tongue portion of the scroll flow path. The blower according to claim 3 or 4.
A blower characterized in that the distance between the outer edge of the protrusion and the outer wall of the scroll flow path is long in the rotational direction starting from the tongue portion of the scroll flow path. A washing machine comprising the blower according to any one of claims 1 to 7.

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