TWI677629B - Electric blower and electric vacuum cleaner with electric blower - Google Patents

Abstract

In the wide air volume area, the electric blower is highly efficient and small and lightweight, and the noise and wing pass frequency noise are also small and the sound quality is good. It is provided in a state of suppressing the performance variation during mass production and Provided is a small-sized electric vacuum cleaner that has improved attractiveness in a wide air volume area, has a small operating sound, and has a good sound quality.

The system includes: a motor including a rotor and a stator; a housing having one end opened to accommodate the motor; a rotating shaft provided at the rotor; and a rotating wing fixed to the rotating shaft. And a division plate arranged at the aforementioned motor side of the rotary wing; and a plurality of diffusion wings arranged at the outer periphery of the rotary wing provided at the opening side of the casing; and a fan case, The diffusion wings cover the diffusion wings. The throats are formed by adjoining wings. The throats are formed at the trailing edge side of the wings, which is closer to the center of the chord length of the adjacent wings. The number is 15 ~ 17.

Description

Electric blower and electric vacuum cleaner with electric blower

[0001] The present invention relates to an electric blower and an electric vacuum cleaner equipped with the electric blower.

[0002] Japanese Patent No. 5903756 (Patent Document 1) is disclosed as a blower of the prior art. [0003] This Patent Document 1 describes "a centrifugal compressor used in a vacuum cleaner, which is provided with a fan van and a diffuser, and operates between a low flow rate and a high flow rate. In a low flow rate, it flows out from the fan van at a first flow angle. In a high flow rate, it flows out of the fan van at a second flow angle. The first flow angle and the second flow flow. The angle difference is at least 20 degrees. The diffuser is provided with a plurality of radial vanes. In order to perform a positive pressure recovery between the aforementioned low flow rate and the aforementioned high flow rate without stalling, the aforementioned radius The number of directional leaves is 15 to 20, and the actual degree of the radial direction leaves is 0.6 to 0.8. The radius ratio of the radial direction leaves from the leaf entrance to the fan van exit is not If it is over 1.5, the fan blade car rotates at a speed exceeding 80krpm in both the low flow rate and the high flow rate. [Prior Art Document] [Patent Document] [0004] [Patent Document 1] Japanese Patent No. 5903756

[0005] The electric vacuum cleaner greatly changes the operating air volume due to the operating conditions such as the clogging of the filter screen and the material of the floor to be cleaned. Therefore, it is attractive for a wide range of air volume. There is a demand for strong electric blowers. In addition, the wing passing frequency noise obtained from the product of the number of fan blades and the number of rotations of the impeller is related to the sound quality during operation, and it is required to be able to reduce it. [0006] Although the diffuser with a fan blade can perform excellent pressure recovery at the design point air volume, at the non-design point air volume, it is caused by the inlet angle of the diffuser fan blade and the direction of the air flow toward the diffuser. If the inflow angle is not the same, the performance of the diffuser will be reduced. Therefore, although the attractive force of the electric vacuum cleaner is high at the design point air volume, it is reduced at the non-design point air volume. [0007] Generally, a vacuum cleaner driven by a battery (secondary battery), such as a wireless upright type or a self-propelled walking type, has a small power consumption and a maximum air volume. Therefore, there is a problem that when the filter is clogged, the dust transfer ability is reduced and the attractive force of the vacuum cleaner is reduced. Furthermore, a wireless upright type or a vacuum cleaner driven by a battery (secondary battery) requires a small size and light weight. For an electric blower installed in a vacuum cleaner, it is required to simultaneously achieve "in a wide air volume" Within the range, the attraction is strong "," small ", and" the wing passing frequency noise during operation is small ".

Patent Document 1 describes "the diffuser is provided with a plurality of radial vanes, and in order to perform a positive pressure recovery between the low flow rate and the high flow rate without causing stall, the radial direction vanes The number of blades is 15 to 20, and the actual degree of the radial direction leaf is 0.6 to 0.8. The radius ratio of the radial direction leaf from the leaf entrance to the fan van exit is less than 1.5. "Patent Document 1 describes a centrifugal compressor equipped with a diffuser." The diffuser mounted on the centrifugal compressor can obtain a positive pressure recovery within the operating range without causing stall. In addition, it states that "the actual degree is preferably in the range of 0.6 to 0.65". Here, the real degree is a value obtained by dividing "the wing chord length of the diffusion wing" by "the circumferential distance between adjacent wings at the entrance radius of the diffusion wing (installation interval)".

Since the above-mentioned centrifugal compressor has a small solid degree of 0.8 or less, it can obtain a wide operating range. However, it is conceivable that there is still room for improvement in the efficiency of the blower. Also, when the degree of solidity is small, the chord length system becomes small. Therefore, if the maximum thickness of the wing is not set to be large for resin molding, the resin system becomes difficult to flow during molding, and It is easy to produce short shots or whiskers, and it may cause the performance to be uneven. Furthermore, if the maximum thickness of the wing is increased, the resistance of the wing is increased, and there is a problem that the blower efficiency is reduced.

The object of the present invention is to solve the above-mentioned problems, and at the same time as improving the efficiency, it is also possible to achieve mass productivity and sound quality improvement caused by reduction of operating sound and reduction of wing passage frequency noise. That is to say, it is an electric blower that is highly efficient in a wide air volume area, is small and lightweight, and has low noise and wing pass frequency noise. The sound quality is also good. It suppresses performance variations during mass production. It provides a small-sized electric vacuum cleaner with a small operating sound and a good sound quality, which improves the attractiveness in a wide air volume area.

In order to solve the above-mentioned problems and achieve the above-mentioned objects, for example, the constitution described in the scope of patent application is adopted.

The present invention includes many means for solving the above-mentioned problems, but if one of them is listed, it is achieved by the following configuration: that is, the motor is provided with a rotor and a stator; and The housing is opened at one end and accommodates the aforementioned motor; and the rotary shaft is provided at the aforementioned rotor; and the rotary wing is fixed at the rotary shaft; and the division plate is arranged at the rotary wing The motor side; and a plurality of diffusion wings provided at the outer periphery of the rotary wing at the opening side of the housing; and a fan case covering the diffusion wings, the diffusion wings being adjacent to each other. The throat part is formed by wings, and the throat part is formed at the trailing edge side more than the center of the chord length of the adjacent wings, and the number of the diffusion wings is 15-17.

[0013] According to the present invention, in addition to being able to achieve high efficiency, it is possible to achieve mass productivity and improvement in sound quality due to reduction in operating sound and reduction in wing passage frequency noise. That is, it is an electric blower that is highly efficient in a wide range of air volume, small and lightweight, and has low noise and wing pass frequency noise. The sound quality is also good. It suppresses performance variations during mass production. It can provide a small electric vacuum cleaner with a small operating sound and a good sound quality, which can improve the attraction in a wide air volume area. [0014] Problems, structures, and effects other than those described above will become clearer based on the following description of the embodiments.

[0016] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. [Embodiment 1] [0017] An electric vacuum cleaner 400 according to an embodiment of the present invention will be described with reference to FIGS. 7 and 8. [0018] In the following, the series will be described as an example of a case in which the electric vacuum cleaner 400 can be used in a charging type suitable for switching between an upright type and a handheld type. Various types of electric vacuum cleaners, such as the upright type or the handheld type. [0019] FIG. 7 shows an electric vacuum cleaner equipped with the electric blower in this embodiment, (a) is a perspective view when the electric vacuum cleaner is used as an upright type, and (b) is a electric vacuum cleaner as a handheld type Side view when it comes to use. [0020] As shown in FIG. 7 (a), the electric vacuum cleaner 400 is provided with a vacuum cleaner body 409, a dust collecting chamber 401 that contains dust as dust, and a suction airflow required to collect the dust. The electric blower 200 (FIG. 1) and the telescopic tube 402 are provided freely and retractably with respect to the cleaner body 409; and the upright grip 403 is installed at one end of the telescopic tube 402; and the switch section 404 It is arranged at the upright grip 403 and is configured to open and close the power of the electric blower 200. [0021] The electric vacuum cleaner 400 shown in FIG. 7 (a) is in an upright state, the telescopic tube 402 is extended, and the upright grip 403 is fixed to the opposite side of the cleaner body 409 via the telescopic tube 402. status. In addition, the suction body 405 is attached to the other end of the cleaner body 409, and the cleaner body 409 and the suction body 405 are connected by the connection part 406. [0022] The electric vacuum cleaner 400 shown in FIG. 7 (b) is in a hand-held state, the telescopic tube 402 is housed in the cleaner body 409, and the upright grip 403 is configured to work with the cleaner body 409 through the telescopic tube 402. Close to the state. In this state, instead of using the upright grip 403, a hand grip 407 disposed at the cleaner body 409 is used to facilitate cleaning in the hand-held state. Further, an suction body (clearance nozzle) 408 is attached to the other end portion of the cleaner body 409, and the cleaner body 409 and the suction body 408 are connected by a connection portion 406. In the above-mentioned electric vacuum cleaner 400, the electric blower 200 (refer to FIG. 1) housed in the cleaner body 409 is driven by operating the switch part 404 of the upright grip 403, and generates a suction airflow. After that, the dust is sucked in from the suction nozzles 405 and 408, and the dust is collected in the dust collection chamber 401 of the cleaner body 409 through the connection portion 406. [0023] FIG. 8 is a longitudinal sectional view of a vacuum cleaner body equipped with the electric blower in this embodiment. In addition, FIG. 8 shows a state where the suction port body 408 is detached from the cleaner body 409 in a hand-held state. As shown in FIG. 8, generally, the inside of the cleaner body 409 is provided with an electric blower 200 that generates an attractive force, a battery unit 410 that supplies power to the electric blower 200, and a drive circuit 411. The air sucked in from the suction nozzles 405 and 408 (refer to FIG. 6 (a), (b)) is sent to the collector disposed in front of the electric blower 200 through a flow path provided in the cleaner body 409. The dust chamber 401 collects dust in the dust chamber 401. In addition, the air after the dust is separated in the dust collecting chamber 401 is discharged from an exhaust port (not shown) formed in the cleaner body 409 through the electric blower 200 and the driving circuit 411 to external. [0024] Next, the electric blower 200 will be described with reference to the external view of the electric blower shown in FIG. 1 (a) and the longitudinal sectional view of the electric blower shown in (b). This electric blower 200 is roughly divided into a blower section 201 and a motor section 202. The blower unit 201 is composed of a centrifugal fan van 1 which is a rotary wing, and a division plate 2 is arranged at a motor unit 202 which is a centrifugal fan van 1 inside the centrifugal fan van 1. A fan case 3 made of resin is provided with a diffuser wing 23 arranged at the outer peripheral portion to accommodate the diffuser wing. The zoning plate 2 is formed by an inner surface of the fan case 3 and an outer peripheral end 2 a of the zoning plate 2 to form an annular flow path 25 through which air flows into the motor portion 202. An air suction port 4 is provided above the fan case 3. The centrifugal fan van 1 is made of a thermoplastic resin and is directly connected to the rotating shaft 5. Here, in this embodiment, although the centrifugal fan van 1 which is a rotary wing is press-fitted and fixed to the rotating shaft 5, it is also possible to set screws at the end of the rotating shaft 5 and use fixing Screw nut to fix the centrifugal fan van 1. [0025] The motor unit 202 is composed of a rotor center 7 fixed at a rotating shaft 5 housed in the housing 6, and a stator center 8 fixed at the housing 6. A stator winding 9 is wound around the stator center 8 to form a phase winding together. The phase winding is electrically connected to a driving circuit 109 provided in the electric blower 200. [0026] The rotor center 7 is formed at the end of the rotating shaft 5 opposite to the end to which the centrifugal fan van 1 is fixed, and is made of a rare-earth bonded magnet. Rare earth based magnets are made by mixing rare earth based magnetic powder with an organic binder. As the bonding magnet of the rare earth system, for example, a gadolinium iron magnet or a neodymium magnet can be used. The rotor center 7 is integrally formed at the rotating shaft 5. [0027] In this embodiment, although a permanent magnet is used at the rotor center 7, the system is not limited to this, and a reluctance motor, which is one of the brushless motors, may be used. [0028] Between the centrifugal fan van 1 and the rotor center 7, bearings 10 and 11 are provided, and a rotating shaft 5 is rotatably supported. A spring 12 is disposed between the bearing 10 and the bearing 11 in a compressed state, and a preload is applied to the bearing 10 and the bearing 11. The bearings 10 and 11 and the spring 12 are enclosed in a bearing cover 13. The housing 6 is made of synthetic resin and includes a support portion 14 for fixing the bearing cover 13. On the outer periphery of the bearing cover 13, there are provided cooling fins 13a having a plurality of long sides in the rotation axis direction as cooling radiators for the bearings 10 and 11. The bearing cover 13 is made of a non-magnetic metal material, and is integrated with the resin case 6 by insert molding. [0029] A screw hole 15 extending in the direction of the rotation axis is formed at an end portion of the support portion 14 of the resin case 6. The fixing screw 16 can be screwed on the screw hole 15. By the screwing of the fixing screw 16, the zoning plate 2 is fixed at the resin case 6. [0030] A circular flow path 25 is formed between the inner surface 3a of the fan case 3 and the outer peripheral end 2a of the zoning plate 2. At the division plate 2, a plurality of diffusion wings 23 are provided in the circumferential direction with the rotation axis 5 as a center. In addition, the area of the annular flow path formed between the inner surface 3a of the fan case 3 and the outer peripheral end 2a of the zoning plate 2 is set to be larger than the exit area of the centrifugal fan van 1. This suppresses an increase in the flow velocity at the annular flow path portion and an increase in the loss at the annular flow path portion. In addition, the diffusion wing 23 of the zoning plate 2 is at the design point, so that the airflow flowing from the centrifugal fan van 1 and the wing inlet angle are slightly consistent with each other, and the speed component of the airflow rotation direction is made by the diffusion wing 23 Reduced, by this, to improve the effect of the diffuser and improve the efficiency of the blower. [0031] Furthermore, by arranging the zoning plate 2 at the side of the motor portion 202 which is inside the centrifugal fan vehicle 1, the airflow in the motor portion 202 caused by the centrifugal fan vehicle 1 can be adjusted. The disturbance is suppressed to suppress the increase of the flow path loss of the motor unit 202, and the friction loss of the disc of the centrifugal fan vehicle 1 can be reduced.

The casing 6 is provided with an opening 17 for allowing air to flow into the casing 6 and an exhaust port 18 for exhausting air to the outside of the electric blower 200. The stator center 8 arranged at the end of the case 6 is fixed to the case 6 by a fixing screw 19.

Next, the flow of air in the electric blower 200 will be described. When the motor unit 202 is driven to rotate the centrifugal fan vehicle 1 as a rotary wing, air flows in from the air suction port 4 of the fan case 3 and flows into the centrifugal fan vehicle 1. The inflowing air is boosted and accelerated in the centrifugal fan van 1, and flows out from the outer periphery of the centrifugal fan van 1. The airflow flowing from the centrifugal fan van 1 flows along the wings when passing through the diffuser wings 23, and the velocity component in the direction of rotation of the airflow is reduced. The airflow flowing from the diffusion wing 23 flows into the motor portion 202 from the annular flow path 25 formed by the inner surface of the fan case 3 and the outer peripheral end 2 a of the zoning plate 2.

The air flowing into the motor section 202 flows into the inside of the casing 6 through the opening 17 of the casing 6. As a result of this inflow of air, the cooling fins 13 a of the bearing cover 13 are cooled, and the bearings 10 and 11 are cooled through the bearing cover 13. The rotor center 7, the stator center 8, and the stator winding 9 are cooled and discharged to the outside. Thereby, each part in the case 6 is cooled. A part of the airflow flowing into the casing 6 is discharged to the outside from the exhaust port 18 of the casing 6. In addition, the number of rotations of the motor is 80,000 to 100,000 min ^-1 .

At the end of the fan box 3, a protrusion 20 is provided, and a mounting hole 21 for fixing the fan box 3 to the casing 6 is provided. A claw-like protrusion 22 is provided at an end portion on the fan unit 201 side of the casing 6 and is fitted and connected to the mounting hole 21 of the fan case 3.

Next, the blower unit 201 of this embodiment example will be described using FIGS. 2 to 3. Fig. 2 (a) is a perspective view of a centrifugal fan van according to one embodiment of the present invention, (b) is a sectional view of a centrifugal fan van, and Fig. 3 is one of the present invention The blower unit in the embodiment is a cross-sectional view taken along the line AA of the electric blower in FIG. 1 (a).

First, using FIG. 2, a centrifugal fan van 1 as a rotating blade in one embodiment of the present invention will be described. The centrifugal fan van 1 according to one embodiment of the present invention is composed of a shroud plate 33 and a hub plate 26 and a plurality of fan blades 27. The hub plate 26 and the blades 27 are integrally formed by a thermoplastic resin. A shield plate 33 made of a thermoplastic resin is formed at a central portion thereof with a ring-shaped suction opening 28 for sucking air.

A concave groove 29 is formed on the pavement of the shroud plate 33 at a position corresponding to the fan blade 27 and extends to the outer diameter side. The concave groove 29 is provided with a through hole 30. At the center of the hub plate 26, a boss 31 having a convex shape in which the rotation shaft 5 is inserted and fixed is formed. The fan blades 27 integrally formed with the hub plate 26 are arranged at regular intervals in the circumferential direction, and are provided with a distance from the inner diameter side toward The shape of the fan blades, which are retracted outward in the radial direction and turned in the direction of rotation. The convex seat 31 is formed with a convex curved surface 31 a so as to extend from the axial direction to the radial direction. On the upper surface of the fan blade 27, a protruding claw 32 and a welding rib are formed. Engage the protruding claws 32 of the fan blade 27 with the through holes 30 of the shroud plate 33, engage the recessed grooves 29 of the shroud plate 33 with the fan blade 27, and engage the claws 32 and the fusion ribs The welding is performed by welding, and thereby the centrifugal fan van 1 is formed. In addition, although there are 8 fan blades shown in the figure, other fan blades can be used.

Since the fused rib is fused in the concave groove 29, the volume of the fused rib is set to be smaller than the volume of the gap when the fan blade 27 is inserted into the concave groove 29. That is, it is possible to prevent the molten resin material from leaking out into the flow path of the centrifugal fan vehicle 1. In addition, since the welding ribs of the blades 27 are melted and fused to the shroud plate 33, the system can prevent the flow that leaks between the blades 27. In this embodiment, although the through-hole 30 is provided at the shroud plate 33 for positioning the shroud plate 33 and the fan blades 27, the system is not limited to this, and may be The shape of the recessed portion that penetrates may be any shape as long as it can fit into the claws 32 of the fan blade 27 and position the shroud plate 33 and the fan blade 27. In addition, convex portions 26a are provided on the outer periphery of the inner surface of the fan blades 27 of the hub plate 26, and the centrifugal fan vehicle 1 is rotated to cut the convex portions 26a to perform balance correction. As a result, the degree of imbalance of the centrifugal fan van 1 can be reduced, and vibration and noise can be reduced. In addition, although FIG. 2 is shown for a closed-type centrifugal fan van provided with a shield plate 33, it is also possible to use an open-type centrifugal fan van without a shield plate 33 or It is a slant-flow fan van which inclines the hub curved surface 31a to the outer periphery of the fan vane in the axial direction regardless of the presence or absence of the shield plate.

Next, a blower 201 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 3. The blower 201 in one of the embodiments of the present invention is provided with 15 diffusion wings 23 arranged at equal intervals in the circumferential direction on the outer periphery of the centrifugal fan van 1 which is a rotary wing. The shape of the diffusion wing 23 in the axial direction is formed from the zoning plate 2 toward the fan case, and is integrally formed with the zoning plate 2 (FIG. 4). The inlet height b3 of the diffuser (the axial dimension of the hub plate on the fan box side of the zoning plate 2 and the front edge of the diffuser wing and the fan box 3b) is set to make it correspond to the flow at the outermost diameter of the impeller. The ratio b3 / b2 between the road height (exit height b2) becomes 1.16 so that the axial direction positions of the zoning plate and the impeller hub plate are slightly consistent with each other. As a result, the deceleration effect of the airflow at the diffuser inlet is improved to make it more efficient, and the performance variation caused by the positional deviation of the impeller shaft direction that is easily generated during mass production is reduced. In addition, the ratio D3 / D2 between the diffuser inlet diameter D3 and the outermost diameter D2 of the impeller is set to 1.1 to achieve both high efficiency and low noise.

Here, the shape of a diffusion wing is demonstrated. The diffuser wing 23 has a stagger angle between the chord length of the wing and a line connecting the front edge of the diffuser and the center of rotation to about 80 degrees. This is relative to the space between the "straight line connecting the trailing edge of the impeller blade with the center of the rotation axis" and the "connection at the pressure surface of the outer edge of the blade" shown in Figure 3. The angled fan blade exit angle β2 is relatively increased to increase the efficiency due to the deceleration in the diffuser. In addition, when a tapered portion or a rounded portion is provided at the outer edge portion of the fan blade, it is only necessary to set the fan blade exit angle at the outer edge portion of the outermost diameter other than these portions as β2 is sufficient. [0042] The diffuser wing 23 is provided with a solid degree obtained by dividing the chord length C (the length from the leading edge 23a of the diffuser wing 23 to the trailing edge 23b) divided by the wing installation interval. Wing shape. In addition, the degree of solidity may be about 1 to 1.3. If the degree of solidity is 1 or more, a slot portion 24 is formed by abutting wings, and the slot portion 24 is provided with being formed adjacently. The characteristic of the center of the wing chord length and closer to the side of the trailing edge 23b enables high efficiency. [0043] In addition, the maximum thickness ratio t / C obtained by dividing the maximum thickness t of the diffusion wing by the diffusion wing chord length C is set to about 8%, so as to simultaneously achieve a thickness that is easy to mold during mass production and Higher efficiency due to lower resistance coefficient. In addition, the maximum thickness ratio is preferably 6 to 12%. With this, even when the operation is performed in an unstable situation such as a rotational stall that is likely to occur under operating conditions on the low air volume side compared to the design point air volume, it is possible to prevent the cause due to repeated stress ( repeated stress). In addition, since the system has a wing shape with a degree of solidity of approximately 1, when the chord length is 9 mm or more, if the maximum thickness is set to 8%, the maximum wing thickness can be ensured to be 0.7 mm or more. It can prevent the generation of whiskers during molding, and can reduce the performance variation during mass production. In addition, the minimum thickness of the diffusion wing 23 is set to be 4% or more of the chord length, and the resin defect at the time of molding is prevented. [0044] The diffusion wing 23 described with reference to FIG. 4 is integrally formed with the zoning plate 2 and is in contact with the fan case 3 located at the opposite side of the zoning plate 2. In addition, at the contact surface 3b of the fan case 3 and the diffusion wing 23, by using a soft material (for example, synthetic rubber) different from the sealing material to make contact, it is possible to make contact with the leakage airflow between the diffusion wings. Suppress, and can improve efficiency. In addition, as shown in FIG. 1, the flow path system of the diffusion wing formed by the fan case 3 and the partition plate 2 is not horizontal, but is a flow path inclined toward the axial direction. This reduces the loss when the airflow sent from the diffusion wing 23 collides with the inner wall 3a of the fan case, and improves efficiency. [0045] Here, in FIG. 5, the influence of the efficiency of the electric blower caused by the solidity of the diffusion wing is shown. In addition, the results of this test are the results when the impeller and diffuser inlet angles are the same. That is, the difference between the diffuser having a practicality close to that of the prior art and the blower of the present embodiment having the diffusion wing 23 is shown. In addition, in Fig. 5, the horizontal axis represents the solidity, and the vertical axis represents the experimental results of the efficiency of the electric blower. Here, the definition of the efficiency of the electric blower in Fig. 5 is obtained by dividing "the product of the suction volume flow rate and the compressibility coefficient and the pressure of the blower" by "the input of the electric blower". According to FIG. 5, it can be known that the efficiency of the blower with a degree of practicality of about 1 to 1.3 is high, and in the case of a diffuser of 0.9 or less as in the prior art, the blower efficiency is reduced. This is because the chord length of the wing is short, so it cannot reduce the deceleration caused by the wing, that is, the speed component of the rotation direction of the airflow from the impeller cannot be reduced. In addition, if the degree of solidity is too large, the friction loss of the wing increases, so the efficiency of the blower decreases. [0046] Next, in FIG. 6, the effect of the electric fan efficiency of the diffuser and the influence of the wing passage frequency noise on the diffuser whose number of the diffuser wing is fixed while the solidity of the diffuser wing is fixed is shown. In addition, this test result is a test result when the impeller and diffuser inlet angles are matched to a solid degree of about 1. The operating rotation number is about 84000 min ^-1 , and the primary component of the wing passage frequency noise is about 11 kHz. In Fig. 6, the horizontal axis represents the number of diffuser wings, and the vertical axis represents the experimental results of the efficiency of the electric blower and the primary component of the frequency noise of the wings. According to FIG. 6, it can be known that if the number of diffusion wings is set to 15, the noise system is the lowest, and the blower efficiency is high. In addition, when the number of diffusion wings is 15, 17, the protruding amount (significant amount) of the frequency band centered on the spoiler noise that is close to the frequency of the primary component of the wing pass frequency noise is Below 6dB, it is helpful for the improvement of sound quality. That is to say, in order to achieve high efficiency and low noise at the same time, it is ideal that the solidity is about 1 to 1.3 and the number of diffusion wings is 15 to 17. [0047] According to the electric blower 200 according to the embodiment of the present invention described above, by having a diffuser having a solid degree of about 1 to 1.3 and a number of diffusion wings of 15 to 17, it is possible to make the follower The velocity component in the direction of rotation of the airflow out of the diffuser wing 23 is reduced to obtain an efficient diffuser effect. The significant amount of frequency noise of the wing is less than 6dB and is small, resulting in low noise and good sound quality. It is possible to suppress the hairiness during molding, and an electric blower capable of reducing variations in mass production performance can be obtained. In addition, by using the electric blower, it is possible to provide a small-sized electric vacuum cleaner having a small operating sound and a good sound quality, which has improved attractiveness in a wide air volume range. [0048] The present invention is not limited to the above-mentioned embodiments, but also includes various modifications. For example, the above-mentioned embodiments have been described in detail for easy explanation of the present invention, and the present invention is not limited to the constituents including all of the above-mentioned descriptions. A part of the configuration of the embodiment can be added, deleted, or replaced with another configuration.

[0049]

1‧‧‧centrifugal fan van

2‧‧‧ zoning board

2a‧‧‧ outside the zoning board

3‧‧‧fan box

3a‧‧‧ Inside surface of fan box

3b‧‧‧The surface of the fan box with the diffuser wing

4‧‧‧air intake

5‧‧‧rotation axis

5a‧‧‧center of rotation axis

6‧‧‧shell

7‧‧‧ rotor center

8‧‧‧ stator center

9‧‧‧ stator winding

10‧‧‧bearing

11‧‧‧bearing

12‧‧‧spring

13‧‧‧bearing cover

13a‧‧‧ cooling fin

14‧‧‧ Support Department

15‧‧‧Screw hole

16‧‧‧ Screw

17‧‧‧ opening

18‧‧‧ exhaust port

19‧‧‧ Stator center fixing screw

20‧‧‧ protrusion

21‧‧‧Mounting holes

22‧‧‧ claw-shaped protrusions

23‧‧‧ Diffusion Wing

23a‧‧‧ leading edge

23b‧‧‧ Trailing Edge of Diffusion Wing

24‧‧‧wing seam

25‧‧‧Circle flow path

26‧‧‧ Hub plate

26a‧‧‧ convex

27‧‧‧Fan leaves

28‧‧‧ Inhalation opening

29‧‧‧ concave groove

30‧‧‧through hole

31‧‧‧ convex seat

31a‧‧‧ convex surface

32‧‧‧ Claw

33‧‧‧shield plate

200‧‧‧ electric blower

201‧‧‧Air blower department

202‧‧‧Motor Department

400‧‧‧ Electric vacuum cleaner body

401‧‧‧ Dust collection room

402‧‧‧Telescopic tube

403‧‧‧ erect grip

404‧‧‧Switch Department

405‧‧‧Suction body

406‧‧‧Connection Department

407‧‧‧Grip

408‧‧‧Suction body (clearance nozzle)

409‧‧‧Vacuum cleaner body

410‧‧‧battery unit

411‧‧‧Drive circuit

[0015] FIG. 1 (a) is an external view of an electric blower in a first embodiment of the present invention. [Fig. 1 (b)] is a longitudinal sectional view of the electric blower in the first embodiment of the present invention. [Fig. 2] (a) is a perspective view of the centrifugal fan van in the first embodiment of the present invention, and (b) is a longitudinal sectional view of the centrifugal fan van. [Fig. 3] is a diagram showing the blower unit in the first embodiment of the present invention, and is a cross-sectional view taken along the line A-A of the electric blower in Fig. 1 (a). [Fig. 4] is a diagram showing a diffuser of a blower in the first embodiment of the present invention. [Fig. 5] It is a comparison chart of the efficiency of an electric blower in which the blowers in the embodiment of the present invention are combined with a motor and an experiment is performed. [Fig. 6] is a graph comparing the noise of the fan and the efficiency of the electric fan due to the number of diffused wings in the embodiment of the present invention and the primary component of the wing pass frequency. [Fig. 7] is a perspective view of an electric vacuum cleaner to which the electric blower according to the embodiment of the present invention is applied.图 [Fig. 8] is a sectional view of the vacuum cleaner body in the electric vacuum cleaner of Fig. 7.

Claims (6)

An electric blower is characterized by comprising: an electric motor including a rotor and a stator; a casing with one end opened to accommodate the electric motor; and a rotating shaft provided at the rotor; and a rotating wing , Is fixed to the rotating shaft; and the division plate is arranged at the aforementioned motor side of the rotating wing; and a plurality of diffusion wings are arranged at the outer periphery of the rotating wing at the opening side of the housing. And the fan box cover the diffuser wing, the diffuser wing forms a throat portion by adjoining the wing, and the throat portion is formed later than the center of the chord length of the adjacent wing At the edge, the number of the diffusion wings is 15-17, and the area of the annular flow path formed between the inner surface of the fan box and the outer peripheral end of the zoning plate is set to be more centrifugal The outlet area of the fan van is larger, and the end portion on the motor portion side of the fan box is fitted and connected to the end portion on the fan portion side of the casing. An electric blower is characterized by comprising: an electric motor including a rotor and a stator; a casing with one end opened to accommodate the electric motor; and a rotating shaft provided at the rotor; and a rotating wing , Is fixed to the rotating shaft; and the division plate is arranged at the aforementioned motor side of the rotating wing; and a plurality of diffusion wings are arranged at the outer periphery of the rotating wing at the opening side of the housing. And the fan box, covering the diffusion wing, the solidity of the diffusion wing is 1 ~ 1.2, and the diffusion wing is 15 ~ 17, formed on the inner surface of the fan box and the aforementioned The area of the annular flow path between the outer peripheral ends of the zoning plate is set to be larger than the area of the exit of the centrifugal fan van. The end portion on the motor part side of the fan box is fitted and connected to the fan The end of the side. According to the electric blower described in item 1 or 2 of the scope of patent application, wherein the maximum thickness ratio of the aforementioned diffusion wing is formed to be 6 to 12% of the chord length. For the electric blower described in item 1 or item 2 of the scope of patent application, the inlet height of the diffusion wing is larger than the outlet height of the impeller. The electric blower according to item 1 or item 2 of the scope of patent application, wherein the diffusion wing is provided at a flow path that is turned to the axial direction. An electric vacuum cleaner characterized by comprising the electric blower described in any one of claims 1 to 5 of the scope of patent application.