TW201800671A - Electric blower and electric vacuum cleaner equipped with the same characterized by having high efficiency over a wide air volume range and promoting the suction force over a wide air vacuum range - Google Patents

Abstract

Provided is a compact lightweight electric blower that is high efficiency over a wide air volume range. At the same time, provided is an electric vacuum cleaner that promotes the suction force over a wide air vacuum range. Including: an electric motor part having a rotator and a stator, a housing having an opening at one end thereof and receiving said electric motor part, a rotation shaft disposed at said rotator, the rotation blades fixed on the rotation shaft, a partition plate arranged at the side of said electric motor part of the rotation blades, an opening side arranged at said housing, and a blade shell body covering said rotation blades. A flow passage is formed between the outer peripheries of said rotation blades and said blade shell body; the housing and the blade shell body are made of resin; and the end part of the blade shell body and the end part of the housing are engaged with each other.

Description

Electric blower and electric vacuum cleaner equipped with the same

The present invention relates to an electric blower and an electric vacuum cleaner equipped with the same.

As a small electric blower for a conventional electric vacuum cleaner, it is disclosed in Japanese Patent Application Laid-Open No. 2010-281231 (Patent Document 1). This patent document 1 describes "equipped with: an impeller having a diagonal flow type blade; a motor driving a rotating shaft to which the impeller is fixed; and an air guide for guiding the air flow generated by the impeller to have an air path on the outer periphery of the motor The air guidance system is a wind path that continuously expands and extends the cross section of the wind path from upstream to downstream, and is divided into plural in the direction of extension and is constituted. "

Further, as a conventional electric blower for an electric vacuum cleaner, Japanese Patent Application Laid-Open No. 2001-17358 (Patent Document 2) is known. This Patent Document 2 describes that "the impeller directly connected to the motor and a diffuser located downstream of the impeller are arranged. The impeller system is a diagonal flow type, the diffuser system is an axial flow type, and it is diffused on the outer periphery of the impeller. The guide plate on the upstream side of the device. "

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2010-281231

[Patent Document 2] Japanese Patent Laid-Open No. 2001-17358

The electric vacuum cleaner is subject to filter blockage or the material of the floor to be cleaned, and the operating air volume varies greatly depending on the operating conditions. Therefore, a wide range of airflow and attractive electric blowers are required by people. .

The electric blowers described in Patent Documents 1 and 2 use an electric motor to rotate an impeller to produce a flow of air. The air flowing in from the suction port of the electric blower is boosted and accelerated by the impeller, and is decelerated between the diffuser blades. As a result, the kinetic energy of the air flowing into the diffuser is converted into pressure energy and the pressure rises. .

The diffuser with a blade is designed to provide excellent pressure recovery at the air volume at the design point, but at a non-design point, the inlet angle of the diffuser blade and the inflow angle of the airflow into the diffuser are not the same, which results in a decrease in the diffuser performance. Therefore, the attractive force of the electric vacuum cleaner has a problem that the air volume is high at a design point, but the air volume is reduced at a non-design point.

A vacuum cleaner driven by a battery (secondary battery), such as a wireless upright or self-propelled type, consumes less power than an electric blower. The maximum air volume is also small. Therefore, when the electric blowers of Patent Documents 1 and 2 are applied to these vacuum cleaners, there is a problem that the maximum air volume is reduced, the garbage transporting capacity is lowered, and even the attractive force of the vacuum cleaner is lowered.

In addition, in the technology described in Patent Document 1, the resin-made air guide is divided into a plurality of directions in the spreading direction, and is configured such that the air guide on the upstream side and the air guide on the downstream side are fitted by fitting. Concave and convex to fit. The upstream air guide system is attached to the motor case, and the downstream air guide system and the fan case system are fitted, and each component is fitted and fixed with an adhesive. Therefore, the assembly is poor, and due to the error in the dimensions of each part, the fan casing may be eccentric or inclined to the rotary shaft and installed, which may cause a problem that the fan casing cannot be maintained at a predetermined position. In addition, if the suction inlet of the impeller and the suction inlet of the fan casing are eccentrically or inclinedly installed, the inlet sealing performance required to suppress the circulating air flow between the impeller inflow portion and the fan casing will deteriorate, resulting in deterioration. The problem of reduced efficiency of electric blowers.

Furthermore, in a general electric blower for an electric vacuum cleaner, the positioning of the fan casing and the impeller is performed by contacting the fan casing with a diffuser blade disposed on the downstream side of the impeller to perform the fan casing Positioning in the direction of the rotation axis. Wide air volume range, especially if the bladeless diffuser is used to improve the efficiency on the large air volume side, positioning of the fan casing becomes difficult, resulting in failure to properly maintain the gap between the fan casing and the inlet of the impeller (inlet seal Performance).

Further, in the technology described in Patent Document 2, a vaneless diffuser portion is disposed between the impeller and the diffuser, and a guide plate is disposed. borrow Here, the swirling speed component of the air flowing out of the impeller can be converted into the axial direction speed component, but the guide plate is supported only by the side surface of the fan casing, so both sides in the direction of the rotation axis are open. Therefore, the air flowing into the guide plate flows to the upstream and downstream sides in the direction of the rotation axis. Therefore, the steering in the guide plate to the downstream side (diffuser side) in the axial direction cannot be smoothly performed, and the loss on the guide plate may increase. And reduce the efficiency of electric blowers. The purpose of the present invention is to solve the above-mentioned problems, improve the reliability of the fitting and maintenance of the fan casing and the motor casing, and further provide a high-efficiency, small and lightweight electric blower in a wide air volume range, and provide a wide air volume range. A small electric vacuum cleaner with increased appeal.

In order to solve the above-mentioned problem, one of the representative electric blowers of the present invention includes a motor unit including a rotor and a stator, a housing having a pre-motor portion opened at one end, and a pre-rotor. A rotating shaft, a rotating blade fixed to the rotating shaft, a partition plate disposed on the motor portion side of the rotating blade, and a fan blade provided on the opening side of the casing of the former to cover the rotating blade of the former A casing; a flow path is formed between the outer peripheral side of the prescriptive rotating blade and the prescriptive fan blade housing; the prescriptive housing and the prescriptive fan blade housing are made of resin, and the end of the prescriptive fan blade housing and the end of the prescriptive fan housing are Can be achieved by fitting.

In order to solve the above-mentioned problems, one of the representative electric blowers of the present invention includes a motor unit including a rotor and a stator, a housing having an opening at one end to accommodate the motor unit described above, and The rotation axis of the preamble rotator, the rotation blade fixed to the rotation shaft, the partition plate disposed on the motor portion side of the prerotation blade, and the opening side of the preamble casing are provided to cover the preamble rotation. The fan casing of the blade; a flow path is formed between the outer periphery of the pre-rotating blade and the pre-fan casing; the guide plate is integrally formed inside the pre-fan casing; the guide plate is connected with the pre-fan blade The top and sides of the shell are connected inside the pre-fan shell. The pre-shell and the pre-fan shell are made of resin. The end of the pre-fan shell and the end of the pre-shell are fittable. Reached.

According to the present invention, the downstream side of the rotating blade is a bladeless diffuser, and by fitting the end portion of the fan casing to the casing, the reliability of the fitting and maintenance of the resin casing and the resin blade casing is maintained. It can be lifted to provide a small and lightweight electric blower, while suppressing the reduction of the inlet sealing performance and maintaining a wide air volume range and high efficiency, thereby providing a small electric vacuum cleaner with enhanced attractiveness in the wide air volume range.

In addition, by reducing the rotation speed component of the airflow flowing from the rotating blades into the rotation axis direction component by the guide plate of the fan casing, the friction loss is reduced, and the turning loss is reduced, which can be used in a wide air volume range. Achieving high efficiency makes it possible to provide a compact electric vacuum cleaner that has increased appeal over a wide air volume range.

The problems, structures, and effects other than the above can be made clear by the following description of embodiments.

1‧‧‧centrifugal impeller

2‧‧‧ divider

3‧‧‧fan blade housing

4‧‧‧air intake

5‧‧‧rotation axis

6‧‧‧ shell

7‧‧‧ rotor core

8‧‧‧ stator core

9‧‧‧ Stator coil

10‧‧‧bearing

11‧‧‧bearing

12‧‧‧ Blade

13‧‧‧bearing cover

13a‧‧‧cooling fan casing

14‧‧‧ Support Department

15‧‧‧Screw hole

16‧‧‧ set screw

17‧‧‧ opening

18‧‧‧ exhaust port

19‧‧‧ Stator core fixing screw

20‧‧‧ protrusion

21‧‧‧Mounting holes

22‧‧‧ claw-shaped protrusions

23‧‧‧ Liner

24‧‧‧ Wheel Plate

25‧‧‧ Blade

26‧‧‧Suction opening

27‧‧‧ concave groove

28‧‧‧through hole

29‧‧‧ Wheel

29a‧‧‧wheel surface

30‧‧‧ Claw

31‧‧‧ on board

32‧‧‧ Surface

33‧‧‧Side

34‧‧‧ Recess

35‧‧‧ Inflow

36‧‧‧ Outflow

37‧‧‧ flange

38‧‧‧Frame

39‧‧‧Screw hole

40‧‧‧inclined

41‧‧‧Mounting Department

42‧‧‧Contact

43‧‧‧Guide Board

100‧‧‧ Electric vacuum cleaner body

200‧‧‧ electric blower

201‧‧‧Air blower department

202‧‧‧Motor Department

[FIG. 1 (a)] An external view of an electric blower according to a first embodiment of the present invention.

[Fig. 1 (b)] A longitudinal sectional view of an electric blower.

[Fig. 2] (a) is a perspective view of the centrifugal impeller according to the first embodiment of the present invention, and (b) is a longitudinal sectional view of the centrifugal impeller.

[Fig. 3] (a) is a perspective view of a fan blade case according to the first embodiment of the present invention, and (b) is a longitudinal sectional view.

[FIG. 4] An explanatory diagram of the air flow of the blower unit according to the first embodiment of the present invention, (a) is an enlarged longitudinal sectional view of the blower unit, and (b) is a cross-section taken along the line AA of the electric blower of FIG. 1 (a); Illustration.

[Fig. 5] (a) is a perspective view of a case according to the first embodiment of the present invention, and (b) is a rear view.

6 (a) is a cross-sectional view taken along the line B-B in FIG. 5 (a), and (b) is a cross-sectional view taken along the line C-C in FIG. 5 (a).

[Fig. 7] (a) is an enlarged view of a portion D shown in Fig. 6 (a), and (b) is an enlarged external perspective view.

8 is a longitudinal sectional view of an electric blower according to a second embodiment of the present invention.

[Fig. 9] (a) is a perspective view of a fan casing according to a second embodiment of the present invention, and (b) is a longitudinal sectional view.

[FIG. 10] An explanatory diagram of an air flow in a blower unit according to a second embodiment of the present invention is a cross-sectional view taken along line E-E in FIG. 8. [FIG.

11 is a longitudinal sectional view of another fan case according to a second embodiment of the present invention.

Fig. 12 is a perspective view of an electric vacuum cleaner to which the electric blower according to the embodiment of the present invention is applied.

13 is a cross-sectional view of a cleaner body in the electric vacuum cleaner of FIG. 12.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In this embodiment, the rotating blade system will be described using a centrifugal impeller.

[Example 1]

The electric vacuum cleaner 300 according to an embodiment of the present invention will be described with reference to FIGS. 12 and 13. FIG. 12 is a perspective view showing an electric vacuum cleaner to which the electric blower of the embodiment is applied. As shown in FIG. 12, 100 is a cleaner body accommodated in a dust collecting chamber 101 for collecting dust and an electric blower 200 (FIG. 13) for generating a suction airflow required for dust collection, and 102 is a cleaner body 100. The holding part 103 is a handle part provided at one end of the holding part 102, and 104 is a switch part provided for the opening and closing of the electric blower 200 in the handle part. A suction nozzle body 105 is attached to the other end of the holding portion 102, and the cleaner body 100 and the suction nozzle body 105 are connected by a connection portion 106. 107 is a charging station for charging the battery unit 108 (FIG. 13).

In the above configuration, when the switch part 104 of the grip part 103 is operated, the electric blower 200 accommodated in the cleaner body 100 is operated to generate a suction airflow. Then, the dust is sucked in from the suction port body 105, and the dust is collected by the connection portion 106 to the dust collecting chamber 101 of the cleaner body 100.

Next, the cleaner body 100 will be described using a cross-sectional view schematically showing the cleaner body 100 in the electric vacuum cleaner shown in FIG. 13. Inside the cleaner body 100 are arranged an electric blower 200 that generates attractive force, a battery unit 108 that drives the electric blower 200, a drive circuit 109, and a dust collecting chamber 101.

The cleaner body 100 is detachable from the holder 102 and can be used as a hand-held cleaner. The cleaner body 100 is provided with a body grip 110 and a suction opening 111. 112 (Fig. 12) is used when the cleaner is used as a hand-held cleaner. The main switch section of the electric blower 200 is turned on and off. The body switch 112 is also operable when the cleaner body 100 is mounted on the holder 102.

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 cross-sectional view of the electric blower shown in (b). The electric fan 200 is roughly divided into a fan unit 201 and a motor unit 202. The blower unit 201 is made of a rotating blade, that is, a centrifugal impeller 1, and a partition plate 2 disposed on the back side of the centrifugal impeller 1, that is, the motor portion 202 side. The fan blade housing 3 is formed. The partition plate 2 is a circular plate, and the inner surface of the fan casing 3 and the outer diameter of the partition plate 2 are formed to allow air to flow into the electricity The circular flow path of the motive part 202. An air suction port 4 is provided on the upper surface of the fan casing 3. The centrifugal impeller 1 is made of a thermoplastic resin and is directly connected to the rotary shaft 5. Here, in this embodiment, the rotating blade, that is, the centrifugal impeller 1 is press-fitted to the rotating shaft 5, but a screw may also be provided at the end of the rotating shaft 5. The centrifugal impeller 1 is fixed using a fixed nut. .

The motor section 202 is composed of a rotor core (rotor) 7 fixed to a rotating shaft 5 housed in a casing 6 and a stator core (fixer) 8 fixed to the casing 6. A stator coil 9 is wound around the stator core 8 to form a phase coil together. The phase coil is electrically connected to the driving circuit 109 provided in the electric blower 200.

The rotor core 7 is formed at an end on the opposite side to the end to which the centrifugal impeller 1 in the rotating shaft 5 is fixed, and is made of a rare earth-based bonded magnet. Rare-earth bonded magnets are made by mixing rare-earth magnetic powder with an organic binder. As the rare earth-based bonded magnet system, for example, thorium iron nitrogen magnet, neodymium magnet, or the like can be used. The rotor core 7 is integrally formed with the rotation shaft 5.

In addition, in this embodiment, the rotor core 7 is a permanent magnet, but it is not limited to this, and a type of commutatorless motor, that is, a reluctance motor or the like can also be used.

Bearings 10 and 11 are provided between the centrifugal impeller 1 and the rotor core 7, and the rotary shaft 5 is rotatably supported. A blade 12 is arranged 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 blade 12 are enclosed by a bearing cover 13. The housing 6 is made of synthetic resin and has a bearing A support portion 14 to which the cover 13 is fixed. On the outer periphery of the bearing cover 13, cooling fins for cooling the bearings 10 and 11, that is, a plurality of cooling fan cases 13 a that are long in the rotation axis direction. The bearing cover 13 is made of a non-magnetic metal material, and is integrated with the resin case 6 by insert molding.

An end portion of the support portion 14 of the resin case 6 is formed with a screw hole 15 extending in the direction of the rotation axis. The screw hole 15 can be screwed with the fixing screw 16, and the partition plate 2 is fixed to the resin case 6 by screwing the fixing screw 16.

An annular flow path is formed between the inner surface of the fan casing 3 and the outer periphery of the partition plate 2. The outer diameter of the partition plate 2 is set so that the area of the annular flow path is larger than the area of the exit of the centrifugal impeller 1. Thereby, it is possible to suppress an increase in the flow velocity in the annular flow path portion, that is, an increase in the loss in the annular flow path portion. In addition, by making the area of the annular flow path larger than the exit area of the centrifugal impeller 1 and setting the outer diameter of the partition plate 2 to be larger than the outer diameter of the centrifugal impeller 1, the partition plate 2 and the fan casing 3 are made larger. It can play the role of a bladeless diffuser, thus improving the efficiency of the blower.

By placing the partition plate 2 on the back side of the centrifugal impeller 1, that is, the motor portion 202 side, to suppress disturbance of the air flow in the motor portion 202 caused by the centrifugal impeller 1, and to suppress an increase in the flow path loss of the motor portion 202, The friction loss of the circular plate of the centrifugal impeller 1 can be reduced.

The casing 6 is provided with an opening 17 through which air flows into the casing 6, and an exhaust port 18 that exhausts air to the outside of the electric blower 200. The stator core 8 arranged at the end of the casing 6 is fixed by a screw. The wire 19 is fixed to the case 6.

Next, the flow of air in the electric blower 200 will be described. When the motor unit 202 is driven to rotate the rotating blade, that is, the centrifugal impeller 1, air flows into the air inlet 4 of the fan casing 3 and flows into the centrifugal impeller 1. The inflowing air is boosted and accelerated in the centrifugal impeller 1 and flows out from the outer periphery of the centrifugal impeller 1. The air flow flowing from the centrifugal impeller 1 flows into the motor portion 202 through an annular flow path formed from the inner surface of the fan casing 3 and the outer periphery of the partition plate 2.

The air that has flowed into the motor section 202 flows into the inside of the case 6 through the opening 17 of the case 6. With this inflow of air, the cooling fan case 13 a of the bearing cover 13 is cooled, and the bearings 10 and 11 are cooled through the bearing cover 13. The rotor core 7, the stator core 8, and the stator coil 9 are cooled and discharged to the outside. Thereby, each part in the casing 6 is cooled. Part of the airflow flowing into the casing 6 is discharged from the exhaust port 18 of the casing 6 to the outside.

A protrusion 20 is provided at an end of the fan blade housing 3, and a mounting hole 21 is provided to fix the fan blade housing 3 to the casing 6. A claw-shaped protrusion 22 is attached to an end portion on the side of the blower portion 201 of the casing 6, and is fitted to the mounting hole 21 of the fan casing 3.

Next, a blower unit 201 according to this embodiment will be described using FIGS. 2 to 4. FIG. 2 (a) is a perspective view of a centrifugal impeller according to an embodiment of the present invention, (b) is a cross-sectional view of a centrifugal impeller, and FIG. 3 (a) is a perspective view of a fan casing according to the present invention. (b) is a cross-sectional view, and FIG. 4 is an explanatory diagram of an air flow of a blower unit in an embodiment of the present invention, and (a) is a blower unit (B) is a cross-sectional view taken along the line A-A of the electric blower in FIG. 1 (a).

First, FIG. 2 is used to explain the rotating blade, that is, the centrifugal impeller 1 in one embodiment of the present invention. The centrifugal impeller 1 according to an embodiment of the present invention is composed of a lining plate 23, a hub plate 24, and a plurality of blades 25. The hub plate 24 and the blade 25 are integrally formed of a thermoplastic resin. A liner plate 23 made of a thermoplastic resin is formed in a central portion and has a circular suction opening 26 for sucking air.

A recessed groove 27 is formed on the flow surface of the lining plate 23 at a position corresponding to the blade 25, and is extended to the outer diameter side. A through-hole 28 is provided in the concave groove 27. A convexly shaped hub 29 is formed in the center of the hub plate 24 and is inserted and fixed by the rotation shaft 5. The blades 25 integrally formed with the hub plate 24 are provided at equal intervals in the circumferential direction, and have a blade shape that recedes from the inner diameter side toward the outer side in the radial direction toward the rotation direction. The hub 29 has a hub curved surface 29a formed in a radial direction from the axial direction. A protruding claw 30 and a rib for welding are formed on the upper surface of the blade 25. The protruding claws 30 of the blade 25 and the through holes 28 of the lining plate 23 and the concave grooves 27 of the lining plate 23 are engaged with the blade 25, and the claws 30 and the welding ribs are joined by welding to form Centrifugal impeller 1.

Since the welding rib is fused in the concave groove 27, the volume of the welding rib can be made smaller than the volume of the gap when the blade 25 is inserted into the concave groove 27. That is, the molten resin material can be prevented from overflowing from the flow path of the centrifugal impeller 1. In addition, since the welding ribs of the blades 25 are fused and welded to the lining plate 23, leakage airflow between the blades 25 can be prevented. in In this embodiment, although the through hole 28 is provided in the lining plate 23 to position the lining plate 23 and the blades 23, it is not limited to this, and it can also be designed into a shape of a non-through recess, as long as it can communicate with the blade 25 If the claws 30 are used for positioning the fitted lining plate 23 and the blades 25, no matter what the shape is.

In addition, a convex portion 24 a is provided on the outer periphery of the back side of the blade 25 of the hub plate 24, and the convex portion 24 a is cut by rotating the centrifugal impeller 1 to perform balance correction. Thereby, the unbalance amount of the centrifugal impeller 1 can be reduced, and vibration or noise can be reduced.

Next, a fan blade housing 3 according to an embodiment of the present invention will be described with reference to FIG. 3. In one embodiment of the present invention, the fan blade housing 3 covers the rotating blades, that is, the centrifugal impeller 1 from the outside, and includes: an upper plate 31 having a circular shape in a bird's eye view; and a continuous upper plate 31. A curved surface 32 extending in the axial direction from the peripheral edge portion of the plate 31 and an annular side plate 33 extending from the curved surface portion 32. A protrusion 20 is provided on an end portion of the side plate 33 of the fan casing 3 on the upper plate 31 side, and a mounting hole 21 for fixing the fan casing 3 to the casing 6 is provided.

An air suction port 4 is provided in the center of the upper plate 31 of the fan casing 3. A recessed portion 34 is provided on the outer diameter side than the air suction port 4, and a suction opening 26 of the centrifugal impeller 1 is arranged in the recessed portion 34. The centrifugal impeller 1 is arranged such that the tip of the fan casing 3 and the tip of the suction opening 26 of the centrifugal impeller 1 have a small gap, and has a suction opening for the air pressurized by the centrifugal impeller 1 to the centrifugal impeller 1 The structure that the amount of air circulating on the 26 side becomes smaller. By providing a sealing member in the recessed portion 34, the sealing effect can be improved, and the blower efficiency can be further improved.

Next, the air flow of the blower unit according to the first embodiment of the present invention will be described using FIG. 4. When the electric motor is driven to rotate the rotating blade, that is, the centrifugal impeller 1, air flows into the centrifugal impeller 1 from the air suction port 4 of the fan casing 3. The air flowing into the centrifugal impeller 1 flows in the direction of the rotating shaft 5 like the inflow airflow 35, and is turned into a radial airflow. Hereinafter, the airflow from the air suction port 4 to the rotation axis 5 is referred to as an axial airflow. The pressure is increased and increased in the centrifugal impeller 1, and the centrifugal impeller 1 becomes an outflow airflow 36. The outflow airflow 36 is a component of the airflow in the direction of rotation, which will hit the inner surface of the fan casing 3, while turning and turning to the axial direction airflow, from the inner surface of the fan casing 3 and the outer periphery of the partition plate 2. The formed annular flow path flows into the casing 6. Since the fan blade housing 3 has a curved surface 32, it can smoothly turn into an axial airflow, and the loss can be reduced. This can improve the efficiency of the blower. In addition, since a diffuser with blades is not used, high efficiency can be obtained in a wide range of air volume other than the design point air volume.

Next, the motor unit 202 according to the first embodiment of the present invention will be described using FIGS. 5 to 7. Fig. 5 (a) is a perspective view of a housing according to an embodiment of the present invention, Fig. 5 (b) is a rear view, and Fig. 6 (a) is a cross-sectional view taken along the line BB of Fig. 5 (a), (b) FIG. 5 (a) is a cross-sectional view taken along the line CC, FIG. 7 (a) is an enlarged view of a portion D shown in FIG. 6 (a), and (b) is an enlarged external perspective view.

The housing 6 is made of synthetic resin, and includes a support portion 14 for fixing a bearing cover 13 in which the bearings 10 and 11 are enclosed. The support portion 14 has a slightly double cylindrical shape and is located inside the front portion of the housing 6. In support A substantially cylindrical portion 14 a inside 14 is fixed to a bearing cover 13 made of a non-magnetic metal material. The slightly cylindrical portion 14 b on the outer periphery of the bearing cover 13 is provided with a plurality of cooling fan cases 13 a that are long in the direction of the rotation axis for cooling the bearings 10 and 11, and are supported by the housing 6. The portion 14 is integrally formed. The cooling fan case 13a is provided on the outer periphery of the bearing cover 13 and has a complicated shape. Therefore, it can be manufactured by a die-casting method to reduce the production cost and obtain high-precision accuracy. The material used for the bearing cover 13 and the cooling fan case 13a is preferably an aluminum alloy which is a non-magnetic metal and has a high thermal conductivity.

An end portion of the support portion 14 of the resin case 6 is formed with a screw hole 15 extending in the direction of the rotation axis. The screw hole 15 can be screwed with the fixing screw 16, and the partition plate 2 is fixed to the casing 6 by the screwing of the fixing screw 16. The outer peripheral portion of the support portion 14 is connected to the frame body 38 having a substantially cylindrical shape via a flange 37. The flange 37 of the frame 38 is provided with a screw hole 39 for fixing the stator core 8 at a certain end. The screw hole 39 can be screwed with the fixing screw 19, and the stator core 8 is fixed to the casing 6 by screwing the fixing screw 19. In addition, a claw-shaped protrusion 22 is provided at an end portion on the side of the blower portion 201 in the frame 38, and is fitted and connected to the mounting hole 21 of the fan casing 3. Thereby, the positioning accuracy in the direction of the rotation axis 5 of the blade housing 3 can be ensured, and the end portion of the resin blade housing 3 and the end portion of the resin housing 6 can be reliably fitted and held. By improving the positioning accuracy of the centrifugal impeller 1 and the fan casing 3, the gap between the centrifugal impeller 1 and the recess 34 of the fan casing 3 can be reduced, and the performance of the electric blower 200 can be improved and the performance during mass production can be reduced. Staggered. Centrifugation The impeller 1 and the fan casing 3 do not contact each other, and a highly reliable electric blower 200 can be provided.

The casing 6 may also be provided with a plurality of openings 17 that allow air to flow into the casing 6 and are formed between the flanges 37, and directly exhaust the air without cooling the rotor core 7, the stator core 8, and the stator coil 9. To the external exhaust port 18.

An inclined portion 40 is provided inside the frame body 38. The structure is such that the air flowing out from the annular flow path formed by the inner surface of the fan casing 3 and the outer periphery of the partition plate 2 easily flows into the opening 17 through the inclined portion 40. The air flowing in through the opening 17 hits the cooling fan case 13 a provided in the bearing cover 13. The heat generated by the bearings 10 and 11 is transmitted by heat conduction in a bearing cover 13 made of a non-magnetic metal material, and is radiated by the cooling fan case 13 a, thereby effectively cooling the bearings 10 and 11.

Even if the housing 6 is made of resin, the heat generated in the bearings 10 and 11 can be efficiently dissipated by the cooling fan case 13 a provided in the bearing cover 13, and the bearings 10 and 11 can be effectively cooled. , Can provide highly reliable electric blower 200. Furthermore, since the casing 6 is made of resin, it can be made lighter, and the electric blower 200 can be made lighter. In this embodiment, the bearing cover 13 and the resin case 6 are integrated by insert molding. However, the bearing cover 13 may be pressed into the resin case 6.

As shown in FIG. 7, an end surface on the side of the fan casing 3 of the frame body 38 is formed with a substantially cylindrical mounting portion 41 that fits into the inner surface of the fan casing 3 and a fan casing. The end face of the body 3 is in contact with the contact portion 42. Therefore, the fan case can be easily carried out by the mounting portion 41 and the contact portion 42. 3's positioning. In addition, the claw-shaped protrusions 22 of the frame body 38 have a substantially triangular column shape and one of the substantially quadrangular faces is a claw-shaped protrusion that is mounted on the mounting portion 41 of the frame body 38. The slightly quadrangular surface 22a is formed perpendicular to the rotation axis, and the other slightly quadrangular surface 22b is formed inclined to the rotation axis.

When the blade housing 3 is attached to the housing 6, the end surface of the protrusion 20 of the resin blade housing 3 is in contact with the slightly quadrangular surface 22b of the claw-shaped protrusion 22 formed obliquely. 3 is pushed in to deform the protrusion 20 toward the outer diameter side, and the claw-shaped protrusion 22 is fitted and connected to the mounting hole 21 of the blade housing 3. Once the mounting hole 21 and the claw-shaped projection 22 are fitted and connected, the blade housing 3 is reliably fixed by the slightly quadrangular surface 22 a of the claw-shaped projection 22.

The mounting hole 21 of the resin blade case 3 and the claw-shaped protrusion 22 of the resin case 3 are fitted and connected, and the end surface of the blade case 3 and the contact portion 42 of the case 6 are brought into contact, thereby ensuring the Positioning accuracy in the direction of the rotation axis 5 of the fan casing 3.

By increasing the positioning accuracy of the centrifugal impeller 1 and the rotation axis 5 of the fan casing 3, the gap between the centrifugal impeller 1 and the recess 34 of the fan casing 3 can be reduced, and the performance of the electric blower 200 can be improved and reduced. Performance varies. In addition, the centrifugal impeller 1 and the fan casing 3 do not contact each other, and a highly reliable electric blower 200 can be provided. In this embodiment, the mounting of the fan casing 3 is performed by the mounting holes 21 of the fan casing 3 and the claw-shaped protrusions 22 of the casing 6, but it may also be installed inside the fan casing 3. A female screw is provided on the surface, and a male screw is provided on the outer periphery of the mounting portion 41 of the casing 3, and the blade housing 3 is fixed by the fitting of the screw.

According to the electric blower 200 of the embodiment described above, the area of the annular flow path between the inner surface of the fan casing 3 and the outer periphery of the partition plate 2 is larger than the exit of the centrifugal impeller 1 Since the outer diameter of the partition plate 2 is set in a large area, an increase in the flow velocity in the annular flow path portion, that is, a loss in the annular flow path portion can be suppressed.

In addition, by making the area of the annular flow path larger than the exit area of the centrifugal impeller 1 and setting the outer diameter of the partition plate 2 to be larger than the outer diameter of the centrifugal impeller 1, the partition plate 2 and the fan casing 3 are made larger. It can play the role of a bladeless diffuser, so the efficiency of the blower can be further improved. Thereby, a compact and lightweight electric blower with high efficiency in a wide air volume range can be obtained.

Furthermore, the partition plate 2 is provided on the motor portion 202 side of the centrifugal impeller 1 to suppress the disturbance of the air flow in the motor portion 202 caused by the centrifugal impeller 1 and suppress the increase in the flow path loss of the motor portion 202. The friction loss of the circular plate of the centrifugal impeller 1 can be reduced, and the efficiency of the blower can be improved.

In addition, the protrusions 20 at the end of the resin blade housing 3 are fitted to the mounting holes 21 of the housing 3 and the claw-shaped protrusions 22 of the slightly square pillars of the resin housing 6, so that the claws can be connected by the claws. The substantially quadrangular surface 22 a of the projecting protrusion 22 secures the fan blade housing 3 and ensures the positioning accuracy of the fan blade housing 3 in the axial direction. Thereby, the gap between the centrifugal impeller 1 and the recessed portion 34 of the fan casing 3 can be reduced, the performance of the electric blower 200 can be improved, and the performance gap can be reduced. In addition, the centrifugal impeller 1 and the fan casing 3 do not contact each other, and a highly reliable electric blower 200 can be obtained.

Furthermore, since the fan casing 3, the casing 6, and the centrifugal impeller 1 Since it is made of resin, the electric blower 200 can be made lighter. By installing the electric blower 200 in the electric vacuum cleaner, the reliability of the electric vacuum cleaner can be improved, and the size and weight can be reduced, and the attractiveness can be enhanced in a wide air volume range.

[Example 2]

Next, an example of the second embodiment will be described with reference to FIGS. 8 to 10. Fig. 8 is a longitudinal sectional view of an electric blower according to a second embodiment of the present invention, Fig. 9 (a) is a perspective view of a fan casing, (b) is a longitudinal sectional view, and Fig. 10 is an air flow Explanatory drawing, sectional drawing on the DD line of the electric blower of FIG. The same components as those of the first embodiment having the same basic configuration are denoted by the same reference numerals, and a description thereof will be omitted.

In this embodiment, the blower unit 201 is composed of a rotating blade, that is, a centrifugal impeller 1, and a partition plate 2, which is arranged on the motor portion 202 side of the back of the centrifugal impeller 1, and accommodates the centrifugal impeller 1. 2 is made of a resin fan case 3. The partition plate 2 has a circular plate shape, and an annular flow path through which air flows into the motor portion 202 is formed on the inner surface of the fan casing 3 and the outer diameter of the partition plate 2. A guide plate 43 is integrally formed on the inner surface of the fan case 3. The fan blade housing 3 includes a circular-shaped upper plate 31 in a bird's-eye view, and a circular shape 32 having a curved surface 32 extending in the direction of the rotation axis 5 continuously from the peripheral edge portion of the upper plate 31 and extending from the curved surface portion 32.的 侧板 33。 The side plate 33. The guide plate 43 is connected to the inside of the blade housing 3 of the side plate 33 on the curved surface 32. The guide plate 43 is provided in a cross section perpendicular to the rotation axis 5, and the guide plate 43 and the adjacent guide plate 43 are provided so as not to overlap each other. Home. In addition, the upper plate 31 of the fan casing 3 is provided with an air suction port 4. In addition, the end of the side plate 33 of the fan casing 3 is provided with a protrusion 20, and a mounting hole 21 for fixing the fan casing 3 to the casing 6 is provided. In addition, the area of the annular flow path formed by the inner surface of the fan casing 3 and the outer diameter of the partition plate 2 is set to be larger than the area of the outlet of the centrifugal impeller 1 to set the minutes. The outer diameter of the separator 2.

As shown in FIG. 10, the outflow airflow 36 from the rotating blade, that is, the centrifugal impeller 1 has a swirling velocity component. Therefore, when the guide plate 43 of the fan casing 3 is not provided, the air flowing out of the centrifugal impeller 1 follows the ring formed by the inner surface of the fan casing 3 and the outer periphery of the partition plate 2. The trajectory (length of the flow trace) until the flow path flows into the case 6 is long. By providing the guide plate 43 in the fan casing 3, the swirling speed component of the outflow airflow 36 can be smoothly converted into the rotation axis direction component, the trajectory when passing through the flow path can be shortened, and friction loss can be reduced. This can improve the efficiency of the blower.

In addition, since the guide plate 43 and the adjacent guide plate 43 do not overlap with each other, the area of the flow path on the inlet side formed by the guide plate 43 and the adjacent guide plate 43 is not reduced. Therefore, the flow velocity flowing into the guide plate 43 is not changed, so that the friction loss at the entrance of the guide plate 43 can be reduced. During operation on the airflow side that is larger than the design point, since the guide plate 43 does not overlap, the inlet of the guide plate 43 does not flow faster than the flow velocity from the centrifugal impeller 1, so that the loss. That is, high efficiency can be maintained in a wide air volume range.

In addition, the guide plate 43 is connected to the curved surface 32 of the fan casing 3. It is connected inside the side plate 33, so the strength of the fan casing 3 can be improved, the deformation of the fan casing 3 can be reduced, and the gap between the centrifugal impeller 1 and the recess 34 of the fan casing 3 can be reduced. Thereby, the performance of the electric blower 200 can be improved and the performance variation can be reduced. In addition, the centrifugal impeller 1 and the fan casing 3 do not contact each other, and a highly reliable electric blower 200 can be obtained.

Furthermore, by strengthening the strength of the fan casing 3, even if the plate thickness of the fan casing 3 is not very thick, the natural vibration number of the fan casing 3 can be increased, and weight reduction can be achieved. In addition, since the number of natural vibrations can be increased, vibration and noise can be reduced.

In addition, the partition plate 2 is set so that the area of the annular flow path between the inner surface of the fan casing 3 and the outer periphery of the partition plate 2 is larger than the exit area of the centrifugal impeller 1. The outer diameter can suppress an increase in the flow velocity in the annular flow path portion, that is, a loss in the annular flow path portion.

Furthermore, the partition plate 2 is provided on the motor portion 202 side of the centrifugal impeller 1 to suppress the disturbance of the air flow in the motor portion 202 caused by the centrifugal impeller 1 and suppress the increase in the flow path loss of the motor portion 202. The friction loss of the circular plate of the centrifugal impeller 1 can be reduced, and the efficiency of the blower can be improved.

In addition, although the guide plate 43 is shown as a straight flat plate in the example of this embodiment, it may be arc-shaped from a cross section perpendicular to the rotation axis 5.

Next, another fan case according to the second embodiment of the present invention will be described with reference to FIG. 11. Fig. 11 is a longitudinal sectional view of a fan casing according to the present invention. As shown in FIG. 11, a plurality of guide plates are provided on the inner surface of the fan casing 3. 43 is integrally formed, and the guide plate 43 is connected to the curved surface 32 and the side plate 33 of the blade housing 3 inside the blade housing 3. The length of the guide plate 43 on the side opposite to the side where the guide plate 43 is connected to the curved surface 32 is shorter than the length connected to the curved surface 32. Therefore, other parts are the same as those of the previous embodiment.

On the side with a larger air volume than the design point, the outflow angle of the outflow airflow 36 from the centrifugal impeller 1 becomes larger. In other words, the turning speed component is smaller than the design point or the low air volume side. Therefore, the outflow airflow 36 is blown to the side surface of the guide plate 43 and hits the inner surface of the fan case 3, and is bent sharply in the direction of the rotation shaft 5. By shortening the length of the guide plate 43 on the opposite side of the connection side between the guide plate 43 and the curved surface 32, the air flow from the guide plate 43 to the motor portion 202 can be prevented from being blocked, and the efficiency of the blower portion 201 can be improved on the large air volume side.

The present invention is not limited to the embodiments described above, and may include various modifications. For example, the above-mentioned embodiments are detailed descriptions for easy understanding of the present invention, and are not limited to the above-mentioned structures. In addition, part of the configuration of one embodiment may be replaced with the configuration of another embodiment, and the configuration of another embodiment may be added to the configuration of one embodiment. In addition, a part of the configuration of each embodiment can be added, deleted, or replaced with another configuration.

1‧‧‧centrifugal impeller

2‧‧‧ divider

3‧‧‧fan blade housing

4‧‧‧air intake

5‧‧‧rotation axis

6‧‧‧ shell

7‧‧‧ rotor core

8‧‧‧ stator core

9‧‧‧ Stator coil

10‧‧‧bearing

11‧‧‧bearing

12‧‧‧ Blade

13‧‧‧bearing cover

13a‧‧‧cooling fan casing

14‧‧‧ Support Department

15‧‧‧Screw hole

16‧‧‧ set screw

17‧‧‧ opening

18‧‧‧ exhaust port

19‧‧‧ Stator core fixing screw

21‧‧‧Mounting holes

22‧‧‧ claw-shaped protrusions

31‧‧‧ on board

32‧‧‧ Surface

33‧‧‧Side

43‧‧‧Guide Board

201‧‧‧Air blower department

202‧‧‧Motor Department

Claims (5)

An electric blower includes a motor section including a rotor and a stator, a housing having an opening at one end to accommodate the preamble motor section, a rotation shaft provided on the preamble rotor, and rotation fixed to the rotation shaft. A blade, a partition plate arranged on the motor side of the rotor blade, and a fan casing provided on the opening side of the casing of the rotor, covering the rotor of the rotor, and the outer peripheral side of the rotor and the rotor A flow path is formed between the casings; the prescriptive casing and the predicated casing are made of resin, and the end of the predicated casing and the end of the preformed casing are fittable. An electric blower includes a motor section including a rotor and a stator, a housing having an opening at one end to accommodate the preamble motor section, a rotation shaft provided on the preamble rotor, and rotation fixed to the rotation shaft. A blade, a partition plate arranged on the motor side of the rotor blade, and a fan casing provided on the opening side of the casing of the rotor, covering the rotor of the rotor, and the outer peripheral side of the rotor and the rotor A flow path is formed between the shells; a guide plate is integrally formed inside the pre-fan blade housing; the guide plate is connected to the top and side of the pre-fan blade housing and connected inside the pre-fan blade housing; The prescriptive shell and the prescriptive fan case are made of resin, and the ends of the prescriptive fan case and the end of the prescriptive shell are fittable. The electric blower according to claim 1 or 2, wherein an end portion of the fan blade case is provided with a protrusion, and a mounting hole is provided in the protrusion; a claw-shaped protrusion is provided at the end portion of the former casing; the installation hole and The aforementioned claw-like protrusions are fittable. The electric blower according to any one of claims 1 to 3, wherein the area of the annular flow path between the inner surface of the fan blade housing and the outer periphery of the fan partition plate is set to be larger than that of the fan blade The export area is still large. An electric vacuum cleaner provided with the electric blower as described in any one of Claims 1-4.