JP2018066306A - Electric blower and electric cleaner equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower which is small and light-weight, achieves high reliability in a wide air quantity range, is highly efficient, and achieves improvement of suction force in the wide air quantity range, and to provide an electric cleaner equipped with the electric blower.SOLUTION: An electric blower has: an electric motor including a rotor and a stator; a rotary shaft rotatably provided; the rotor integrally molded with one end part of the rotary shaft; a rotor blade attached to the other end part of the rotary shaft; and bearings attached to the rotary shaft in between the rotor and the rotor blade and includes: a bearing cover enclosing the bearings; a housing integrally molded with the bearing cover; a partition plate disposed at the electric motor side of the rotor blade; and a fan casing which is provided at the rotor blade side of the housing and covers the rotor blade. An annular passage is formed between the outer periphery side of the partition plate and the housing and an opening is provided at a part of an outer periphery part of the fan casing.SELECTED DRAWING: Figure 1a

Description

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

  A conventional electric blower for a vacuum cleaner is disclosed in Japanese Patent Application Laid-Open No. 2001-271794 (Patent Document 1).

  In this patent document 1, “a motor that is covered by a bracket and rotationally drives an impeller, a diffuser portion that is provided on the outer periphery of the impeller, has a plurality of stationary blades on the surface, and is formed between adjacent stationary blades; An electric motor that has a fan case that includes an impeller and is attached to a bracket, and cools the motor by airflow generated by the impeller. A part of the airflow that has passed through the diffuser section is released to the outside of the fancase. The electric blower is set such that S1 ≦ S2, where S1 is the total area of the slits and S2 is the total area of the exhaust ports provided in the bracket.

JP 2001-271794 A

  Since the electric airflow greatly changes depending on the operating conditions such as clogging of the filter and the material of the floor to be cleaned, an electric blower having a strong suction force in a wide airflow range is required.

  The electric blower described in Patent Document 1 creates an air flow by rotating an impeller with an electric motor. The air flowing in from the suction port of the electric blower is boosted and accelerated by the impeller and decelerated between the vanes of the diffuser arranged on the outer periphery of the impeller, so that the kinetic energy of the air flowing into the diffuser is converted into pressure energy. The pressure is further increased.

  The vaned diffuser can perform excellent pressure recovery at the design point air flow, but at non-design point air flow, the diffuser performance may be reduced due to the mismatch between the inlet angle of the diffuser blade and the inflow angle of the air flow into the diffuser. is there. For this reason, the suction force of the vacuum cleaner is high near the design point air volume, but may decrease at the non-design point air volume.

  A cleaner driven by a battery (secondary battery) such as a cordless stick type or a self-propelled electric vacuum cleaner that autonomously runs in a predetermined cleaning area (for example, indoors) consumes less power and has a maximum airflow. small. Therefore, when the electric blower of patent document 1 is applied to these vacuum cleaners, there existed a subject that the dust conveyance capability fell by the fall of the maximum air volume, and the suction power of the vacuum cleaner fell.

  In addition, a plurality of slits provided in the fan case can exhaust a part of the air flowing out from the diffuser without passing through the inside of the housing in which the motor is stored, so that the efficiency of the electric blower can be improved. Since the air is rapidly expanded from the section and exhausted to the outside, there is a concern that the exhaust resistance of the slit is large and the cost for improving the efficiency of the electric blower is small.

In consideration of motor cooling, S1 ≦ S2 where S1 is the total area of the exhaust port of the fan case and S2 is the total area of the exhaust port of the motor housing (bracket), but from the diffuser outlet to the return guide vane. There is no description of the bent channel inlet area, and if the bent channel inlet area is small, the motor cooling may not be sufficiently performed even if the motor housing exhaust port area S2 is larger than the fan case exhaust port area S1. there were. Furthermore, in order to increase the bent flow path inlet area without deteriorating the diffuser performance, there is a problem that the fan casing diameter needs to be increased and the size is increased.
In addition, since a plurality of slits are provided on the outer periphery of the fan casing, blade-passing frequency noise (rotation frequency x number of impeller blades) due to interference between the impeller and the diffuser, and fluid noise generated by air flow from the slits. Released. Therefore, since noise is emitted from the entire outer periphery of the electric blower, there is a problem that the noise of the electric blower and the vacuum cleaner equipped with the electric blower increases.

  Further, a part of the air flowing out from the diffuser outlet is exhausted to the outside through the slit of the fan casing, and the remaining air becomes the following curved flow on the meridian surface. First, it turns about 90 ° in the curved flow path and flows in the direction of the rotation axis. Thereafter, it is further turned by approximately 90 ° to become a radially inward flow and flows into the return guide vane. The flow that has passed through the return guide vane is further turned by approximately 90 ° to become an axial flow, flows into the motor housing, cools the motor in the motor housing, is bent in the radial direction from the exhaust port of the motor housing, and is discharged to the outside. To do.

  In this way, the air flowing out from the diffuser outlet is diverted to the axial flow in the curved flow path, becomes the radial inward flow in the return guide vane, flows further in the axial direction in the motor housing, and flows in the radial direction in the exhaust port. Turn to. For this reason, the flow is disturbed on the downstream side of the diffuser, bending loss and the like increase, and there is a problem that the efficiency of the electric blower decreases.

  An object of the present invention is to solve the above-mentioned problems, and to efficiently cool a bearing and a motor of an electric blower, improve the efficiency of the electric blower, and achieve a small and lightweight electric blower that is highly efficient in a wide air volume range. It is to provide a small vacuum cleaner and a self-propelled electric vacuum cleaner while providing the suction force in a wide air volume range.

  In order to solve the above-described problems, one of the typical electric blowers of the present invention includes an electric motor including a rotor and a stator, a rotatable rotation shaft, and one end of the rotation shaft. A bearing cover that includes a rotor to be molded, a rotor blade that is attached to the other end of the rotor shaft, and a bearing that is attached to the rotor shaft between the rotor and the rotor blade. A housing formed integrally with the rotor, a partition plate disposed on the motor side of the rotor blade, and a fan casing provided on the rotor blade side of the housing and covering the rotor blade, and the annular flow between the outer periphery side of the partition plate and the housing This is achieved by forming a path and providing an opening in a part of the outer periphery of the fan casing.

  According to the present invention, the downstream side of the rotor blade is a vaneless diffuser and can operate in a wide air flow range. Furthermore, part of the air that flows out of the rotor blades is exhausted from the opening of the fan casing to the outside, so that the loss of the bent portion can be reduced. To provide a small electric blower that is highly reliable and maintains high electric blower efficiency in a wide air volume range because it can flow into the electric motor section from the road, cool the bearings and motor in the housing and exhaust to the outside. Can do.

  Moreover, since the opening part is provided in one place of the fan casing, noise is radiated from one direction of the opening part. When this electric blower is mounted on a vacuum cleaner, the exhaust air from the opening of the fan casing is arranged so as to be on the floor side of the vacuum cleaner, thereby reducing the suction power in a wide air volume range. A vacuum cleaner and a self-propelled electric vacuum cleaner can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is an external view of the electric blower in the embodiment of the present invention. It is a longitudinal cross-sectional view of an electric blower. It is a schematic diagram showing the annular flow path shape of an electric blower. It is a perspective view of the centrifugal impeller in the example of an embodiment of the present invention. It is a longitudinal cross-sectional view of a centrifugal impeller. It is a perspective view of the fan casing in the example of an embodiment of the present invention. It is a longitudinal cross-sectional view. It is sectional drawing in the DD line of FIG. 3b, and is explanatory drawing which shows the shape of the outer peripheral part of a fan casing. It is an external view of the other fan casing in the example of an embodiment of the present invention. It is explanatory drawing which shows the flow of the air blower part in the example of embodiment of this invention, and is the longitudinal cross-sectional view which expanded the air blower part. It is explanatory drawing which shows the flow of the air blower part in the embodiment of this invention, and is sectional drawing in the EE line | wire of the electric blower of FIG. 1a. It is a perspective view of the housing in the example of an embodiment of the present invention. It is a rear view of the housing in the example of an embodiment of the present invention. It is sectional drawing in the FF line of FIG. 6a. It is sectional drawing in the GG line of FIG. 6a. It is a perspective view of the stick type vacuum cleaner to which the electric blower in the embodiment of the present invention is applied. It is a longitudinal cross-sectional view of the vacuum cleaner of FIG. It is an external appearance perspective view of the self-propelled electric vacuum cleaner to which the electric blower in the embodiment is applied. It is a bottom view of the self-propelled electric vacuum cleaner to which the electric blower in the embodiment is applied. It is sectional drawing of the self-propelled electric vacuum cleaner in the HH line of FIG.

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

  For the electric blower 200 according to one embodiment of the present invention, refer to the external view of the electric blower shown in FIG. 1a, the longitudinal sectional view of the electric blower shown in FIG. 1b, and the schematic diagram of the annular flow path portion shown in FIG. I will explain. The electric blower 200 is roughly divided into a blower unit 201 and an electric motor unit 202. The blower unit 201 includes a centrifugal impeller 1 that is a rotary blade, and a partition plate 2 disposed on the motor unit 202 side that is the back surface of the centrifugal impeller 1, and is made of a resin that houses the centrifugal impeller 1 and the partition plate 2. The fan casing 3 is configured. The partition plate 2 has a disc shape, and an annular flow path 4 (hereinafter referred to as an annular flow path 4) through which air flows into the electric motor unit 202 with the inner surface of the housing 8 and the outer diameter of the partition plate 2 (the hatched portion in FIG. 1c) ) Is formed. A vaneless diffuser is formed between the inner periphery of the centrifugal impeller 1 and the fan casing 3.

An air suction port 5 is provided on the upper surface of the fan casing 3, and an opening 6 is provided on the outer peripheral portion 34 of the fan casing 3 so as to exhaust a part of the air flowing out from the centrifugal impeller 1. The inner diameter of the outer peripheral portion 34 of the fan casing 3 gradually increases from the upstream side in the rotation direction of the opening 6 (arrow shown in FIG. 1c) toward the flow direction of the air flowing out from the centrifugal impeller 1. That is, the inner diameter is the same from the opening end 6a which is the end of the opening 6 toward the rotation direction of the centrifugal impeller 1, but in the present embodiment, the center in the width direction of the opening 6 and the rotation shaft 7 The inner diameter is gradually increased from the point A to the open end 6b, starting from a point A that intersects the fan casing 3 and extending from a line connecting the centers of the two. (See Figure 3c)
The opening 6 is a substantially arc-shaped part that connects the opening end 6a and the opening end 6b with a smooth virtual curve.

  The centrifugal impeller 1 is made of a thermoplastic resin and is directly connected to the rotating shaft 7. Here, in this embodiment, the centrifugal impeller 1 which is a rotary blade is press-fitted and fixed to the rotary shaft 7, but a screw is provided at the end of the rotary shaft 7 and the centrifugal impeller 1 is fixed using a fixing nut. You may do it.

  The electric motor unit 202 includes a rotor core 9 fixed to the rotary shaft 7 housed in the housing 8 and a stator core 10 fixed to the housing 8. A stator winding 11 is wound around the stator core 10 to form a phase winding together. The phase winding is electrically connected to a driving circuit (see FIGS. 9 and 11) provided in the electric blower 200.

  The rotor core 9 is formed at the end of the rotating shaft 7 opposite to the end where the centrifugal impeller 1 is fixed, and is made of a rare earth bond magnet. A rare earth bond magnet is made by mixing a rare earth magnetic powder and an organic binder. As the rare earth bond magnet, for example, a samarium iron nitrogen magnet, a neodymium magnet, or the like can be used. The rotor core 9 is integrally formed with the rotating shaft 7.

  In the present embodiment, a permanent magnet is used for the rotor core 9, but a reluctance motor, which is a kind of non-commutator motor, may be used without being bound by this.

  Bearings 12 and 13 are provided between the centrifugal impeller 1 and the rotor core 9, and the rotary shaft 7 is rotatably supported. A spring 14 is disposed between the bearing 12 and the bearing 13 in a compressed state, and a preload is applied to the bearing 12 and the bearing 13. The bearings 12 and 13 and the spring 14 are contained in a bearing cover 15. The housing 8 is made of synthetic resin and has a support portion 16 for fixing the bearing cover 15. The bearing cover 15 is made of a nonmagnetic metal material and is integrated with the resin housing 8 by insert molding. The bearing cover 15 is preferably made of a material having high thermal conductivity such as an aluminum alloy.

  A screw hole 17 extending in the rotation axis direction is formed at the end of the support portion 16 of the resin housing 8. A fixing screw 18 can be screwed into the screw hole 17, and the partition plate 2 is fixedly installed on the resin housing 8 by screwing the fixing screw 18.

  An annular flow path 4 is formed between the radially inner peripheral surface of the housing 8 and the outer peripheral surface of the partition plate 2. By installing the partition plate 2 on the side of the electric motor unit 202 that is the back surface of the centrifugal impeller 1, the flow loss of the electric motor unit 202 is increased by suppressing the disturbance of the air flow in the electric motor unit 202 by the centrifugal impeller 1. And the frictional loss of the disc of the centrifugal impeller 1 can be reduced.

  In this embodiment, the outer diameter of the centrifugal impeller 1 and the outer diameter of the partition plate 2 are the same. However, by making the outer diameter of the partition plate 2 larger than the outer diameter of the centrifugal impeller 1, the partition plate Since the effect increases as a vaneless diffuser between the fan casing 3 and the fan casing 3, the blower efficiency can be improved.

  The housing 8 is provided with an opening 19 so that air flows into the housing 8 and an exhaust port 20 for discharging the air to the outside of the electric blower 200. The stator core 10 disposed at the end of the housing 8 is fixed to the housing 8 by a fixing screw 21.

  The outer diameter of the partition plate 2 is set so that the area of the annular flow path 4 (the hatched portion in FIG. 1 c) is larger than the area of the opening 6 of the fan casing 3. The circular return path 4 is a portion (shaded portion in FIG. 1c) from the outer peripheral surface of the partition plate 2 to the inner peripheral surface of the housing 8, and the area of the circular return path 4 is the area of that portion. The area of the opening 6 of the fan casing 3 is an area of a substantially arc-shaped portion from the opening end 6a to the opening end 6b.

  Thereby, the air quantity which flows into the annular flow path 4 can be increased more than the air quantity which flows out from the opening part 6 of the fan casing 3, and the electric motor 202 part can be cooled. Further, since a part of the air flowing out from the centrifugal impeller 1 is discharged from the opening 6 of the fan casing 3, the amount of air flowing into the annular flow path 4 is reduced, and the flow rate in the annular flow path 4 is reduced. The increase can be suppressed. Furthermore, the air flowing out from the centrifugal impeller 1 is bent in the direction of the rotation axis in the annular flow path 4, but since the area of the annular flow path 4 is increased, the loss in the annular flow path portion can be reduced. it can. Thus, it is possible to achieve both the downsizing of the fan casing 3 and the suppression of the loss increase in the annular flow path portion.

  Next, the flow of air in the electric blower 200 will be described. When the motor unit 202 is driven to rotate the centrifugal impeller 1 that is a rotary blade, air flows from the air suction port 5 of the fan casing 3 and flows into the centrifugal impeller 1. The air that has flowed in is boosted and accelerated in the centrifugal impeller 1 and flows out from the outer periphery of the centrifugal impeller 1. Between the inner periphery of the centrifugal impeller 1 and the fan casing 3, it acts as a vaneless diffuser. A part of the air flow flowing out from the centrifugal impeller 1 flows out from the opening 6 of the fan casing 3, and the remaining air flow is formed by the inner peripheral surface of the fan casing 3 and the outer peripheral surface of the partition plate 2. It flows into the electric motor part 202 from the annular flow path 4.

  The air that has flowed into the electric motor unit 202 flows into the housing 8 from the opening 19 of the housing 8. The bearing cover 15 is cooled by the inflow air, the bearings 12 and 13 are cooled via the bearing cover 15, and a part of the air cools the rotor core 9, the stator core 10, and the stator winding 11 and is discharged to the outside. Thereby, the electric motor unit 202 in the housing 8 is cooled. A part of the air flow that flows into the housing 8 is discharged to the outside from the exhaust port 20 of the housing 8 without cooling the rotor core 9, the stator core 10, and the stator winding 11. Thereby, the bending loss in the electric motor part 202 can be reduced, and the electric blower efficiency is improved.

  A protrusion 22 is provided at the end of the fan casing 3, and a mounting hole 23 for fixing the fan casing 3 to the housing 8 is provided. A claw-like protrusion 24 is provided at the end of the housing 8 on the blower unit 201 side, and is fitted and connected to the mounting hole 23 of the fan casing 3.

  Next, the blower unit 201 according to the present embodiment will be described with reference to FIGS. 2a is a perspective view of a centrifugal impeller according to an embodiment of the present invention, FIG. 2b is a sectional view of the centrifugal impeller, FIG. 3a is a perspective view of a fan casing 3 according to the present invention, FIG. 3b is a longitudinal sectional view, FIG. 3c is a cross-sectional view taken along the line DD of FIG. 3b and is an explanatory view showing the outer peripheral shape of the fan casing 3, FIG. 4 is an external view of another fan casing 3 in the embodiment of the present invention, and FIG. It is explanatory drawing which shows the flow of the air blower part in one Example, FIG. 5B is explanatory drawing which shows the flow of the air blower part in one Example of this invention, and is E- of the electric blower of FIG. It is sectional drawing in the E line.

  First, a centrifugal impeller 1 which is a rotary blade in an embodiment according to the present invention will be described with reference to FIG. A centrifugal impeller 1 according to an embodiment of the present invention includes a shroud plate 25, a hub plate 26, and a plurality of blades 27. The hub plate 26 and the blades 27 are integrally formed of a thermoplastic resin. The shroud plate 25 made of thermoplastic resin is formed with an annular suction opening 28 for sucking air at the center.

  On the flow path surface side of the shroud plate 25, a concave groove 29 is formed at a position corresponding to the blade 27 and extends to the outer diameter side. A convex boss 30 is formed at the center of the hub plate 26. A collar 31 on which the rotary shaft 7 is inserted and fixed is formed integrally with the boss 30. The tip of the collar 31 has a hexagonal shape. Thereby, when each component is assembled into the electric blower 200, the centrifugal impeller 1 can be easily rotated using a hand or a tool, and the presence or absence of an initial rotation abnormality can be inspected.

  In this embodiment, the hub plate 26 and the collar 31 are integrally formed. However, the hub plate 26 and the collar 31 may be press-fitted and fixed without being caught by this. Moreover, although the edge part of the collar 31 is made into the hexagonal shape, it is not restrained by this and is good also as a 2 surface shape and a cylindrical shape.

  The blades 27 integrally formed with the hub plate 26 are installed at equal intervals in the circumferential direction, and have a blade shape that retreats in the rotation direction from the inner diameter side toward the outer diameter direction. The boss 30 has a curved surface that extends from the axial direction to the radial direction. Protruding claws and welding ribs are formed on the upper surface of the blade 27. The centrifugal impeller 1 is formed by engaging the projection 27 of the blade 27 with the concave groove 29 of the shroud plate 25 and the blade 27 and joining the claw and the welding rib by welding.

Since the welding rib melts in the concave groove 29, the volume of the welding rib is made smaller than the volume of the gap when the blades 27 are inserted into the concave groove 29. That is, it can suppress that the molten resin material protrudes into the flow path of the centrifugal impeller 1. In addition, since the welding ribs of the blades 27 are melted and welded to the shroud plate 25, leakage flow between the blades 27 can be prevented.
In addition, the convex part 26a is provided in the outer periphery by the side of the back surface of the blade | wing 27 of the hub board 26, and balance correction can be performed by rotating the centrifugal impeller 1 and shaving the convex part 26a. Thereby, the amount of unbalance of the centrifugal impeller 1 can be reduced, and vibration and noise can be reduced.

  Next, a fan casing 3 according to an embodiment of the present invention will be described with reference to FIG. The fan casing 3 in one embodiment according to the present invention covers the centrifugal impeller 1 that is a rotary blade from the outside, and is continuous with the circular upper plate portion 32 and the peripheral portion of the upper plate portion 32 in plan view. And a curved surface portion 33 extending in the axial direction, and a substantially annular outer peripheral portion 34 extending from the curved surface portion 33. An opening 6 is provided in the outer peripheral portion 34.

  The inner diameter of the outer peripheral portion 34 of the fan casing 3 is such that the line connecting the center and center on the wide side in the width direction of the opening ends 6a and 6b, which are the ends of the opening 6, extends to the point A where the fan casing 3 intersects. As a starting point, the inner radius r1 of the fan casing 3 in the range B from the point A to the opening end 6a is the same, but the fan casing in the range C from the point A to the opening end 6b which is the end of the opening 6 is the same. The inner radius r2 of 3 gradually increases. That is, the inner radius of the fan casing 3 is r1 <r2. The radius r2 of the fan casing 3 is gradually increased from the point A toward the opening end 6b. The center in the width direction of the opening 6 is defined as 6c as an angle between the opening end 6a and the center in the width direction of the opening 6, and 6d as an angle between the opening end 6b and the center in the width direction. The point where angle 6c = angle 6d is the center in the width direction. In the present embodiment, since the opening end 6a and the opening end 6b are provided in parallel to the rotating shaft 7, the widths of the opening ends 6a and 6b are the same.

  Thus, the vaneless diffuser portion formed on the inner peripheral surface of the centrifugal impeller 1 and the fan casing 3 can reduce the speed of the air flowing out from the centrifugal impeller, so that the kinetic energy is converted into pressure energy. Can be converted, and the fan efficiency can be improved. Further, because of the vaneless diffuser, high efficiency can be obtained in a wide air flow range. Further, although the radius r2 is gradually increased, since the central diameter in the width direction of the opening 6 is small, it is possible to achieve both miniaturization and high efficiency.

  In the present embodiment, the opening 6 is open in a range of approximately 1/6 of the entire circumference of the outer peripheral portion 34. The area of the opening 6 is set to be smaller than the area of the annular flow path 4 formed between the inner surface of the housing 8 and the outer periphery of the partition plate 2. As a result, the amount of air flowing through the annular flow path 4 can be increased more than the amount of air flowing out from the opening 6 of the fan casing 3, the motor 202 can be sufficiently cooled, and further from the opening 6. Since a part of the air flowing out from the centrifugal impeller 1 is discharged, an increase in the flow velocity in the annular flow path 4, that is, an increase in loss in the annular flow path portion can be suppressed, and the fan efficiency is improved. Can be made.

  By rotating the centrifugal impeller 1, blade passing frequency noise (rotation frequency × number of impeller blades) and fluid noise generated by the flow of air are discharged from the opening 6. Since the opening 6 in the present embodiment is approximately 1/6 of the entire circumference of the outer peripheral portion 34, when mounted on a vacuum cleaner, a silent structure can be taken for radiated sound from one direction. That is, it is possible to reduce the sound absorbing material in the main body of the vacuum cleaner, leading to cost reduction of the vacuum cleaner. Furthermore, since the diameter in the center in the width direction of the opening 6 is small, the vacuum cleaner is reduced in size.

  A protrusion 22 is provided at the end of the outer peripheral portion 34 opposite to the upper plate portion 32 of the fan casing 3, and a mounting hole 23 for fixing the fan casing 3 to the housing 8 is provided. An air suction port 5 is provided in the center of the upper plate portion 32 of the fan casing 3. A recess 35 is provided on the outer diameter side of the air suction port 5, and the suction opening 28 of the centrifugal impeller 1 is disposed in the recess 35. The centrifugal impeller 1 is disposed so that there is a small gap between the tip of the suction opening 28 of the fan casing 3 and the centrifugal impeller 1, and the air pressurized by the centrifugal impeller 1 circulates to the suction opening 28 side of the centrifugal impeller 1. It has a structure that reduces the amount of air to be generated. In addition, by providing a sealing member in the recess 35, the sealing effect can be enhanced and the fan efficiency can be further improved.

  In the present embodiment, the opening ends 6a and 6b of the opening 6 provided in the fan casing 3 are formed in parallel with the rotating shaft 7, but as shown in FIG. By widening the opening end 6b in the width direction and forming it obliquely with respect to the rotary shaft 7 when viewed from the side, the blade passing frequency noise generated by the interference between the blade 27 of the centrifugal impeller 1 and the opening end 6b is reduced. Since the phase difference can be generated, the blade passing frequency noise can be reduced in a wide rotational speed range, and the noise of the electric vacuum cleaner can be reduced. The fan casing 3 shown in FIG. 4 has the opening end 6b widened in the width direction, but the same applies even if the opening end 6a side or both sides of the open end 6a and the open end 6b are widened in the width direction. The effect is obtained.

  Next, the flow of the blower unit of the first embodiment according to the present invention will be described with reference to FIG. When the centrifugal impeller 1 that is a rotor blade is rotated by driving the electric motor, the centrifugal impeller 1 flows from the air suction port 5 of the fan casing 3. The air that has flowed into the centrifugal impeller 1 flows in from the direction of the rotating shaft 7 as in the inflow flow 36 and turns into a radial flow. Hereinafter, the flow from the air suction port 5 toward the rotating shaft 7 is referred to as an axial flow. The exhaust flow whose pressure is increased and increased in the centrifugal impeller 1 becomes an outflow flow 37 from the centrifugal impeller 1.

  The outflow flow 37 has a flow component in the swirling direction, hits the inner surface of the fan casing 3, turns to an axial flow while swirling, and is formed on the annular flow path 4 formed by the inner surface of the housing 8 and the outer periphery of the partition plate 2. Into the housing 8. Since the fan casing 3 has the curved surface portion 33, the fan casing 3 can be smoothly turned to the axial flow, and the loss can be reduced. Thereby, fan efficiency can be improved. In addition, since the vaneless diffuser is used, high efficiency can be obtained in a wide air volume region other than the design point air volume.

  A part of the outflow flow 37 from the centrifugal impeller 1 flows in the radial direction from the opening 6 of the fan casing 3 and exhausts to the outside (exhaust flow 38). Thus, the outflow flow 37 from the centrifugal impeller 1 has an exhaust flow path configuration of an axial flow and a radial flow.

  Next, the electric motor unit 202 in the first embodiment of the present invention will be described with reference to FIGS. 6a is a perspective view of a housing according to an embodiment of the present invention, FIG. 6b is a rear view, FIG. 7a is a sectional view taken along line FF in FIG. 6a, and FIG. 7b is taken along line GG in FIG. FIG.

  The housing 8 is made of synthetic resin and has a support portion 16 that fixes a bearing cover 15 that encloses the bearings 12 and 13. The support portion 16 has a substantially double cylindrical shape and is located inside the front portion of the housing 8. A bearing cover 15 is fixed to a substantially cylindrical portion 16 a inside the support portion 16.

  A screw hole 17 extending in the rotation axis direction is formed at the end of the support portion 16 of the resin housing 8. A fixing screw 18 can be screwed into the screw hole 17, and the partition plate 2 is fixedly installed on the housing 8 by the screwing of the fixing screw 18. The outer peripheral portion of the support portion 16 is connected to a substantially cylindrical frame 40 by a bridge 39. A screw hole 41 for fixing the stator core 10 is provided at an end portion of the frame 40 where the bridge 39 is provided. A fixing screw 21 can be screwed into the screw hole 41, and the stator core 10 is fixedly installed on the housing 8 by screwing the fixing screw 21. Further, a claw-like protrusion 24 is provided at an end of the frame 40 on the blower unit 201 side, and is fitted and connected to the mounting hole 23 of the fan casing 3.

  Thereby, the positioning accuracy of the fan casing 3 in the direction of the rotation axis 7 can be ensured, and the end portion of the resin fan casing 3 and the end portion of the resin housing 8 can be reliably fitted and held. By improving the positioning accuracy of the centrifugal impeller 1 and the fan casing 3, the variation in the gap between the concave portions 35 of the centrifugal impeller 1 and the fan casing 3 can be reduced, and the performance of the electric blower 200 and the performance during mass production can be reduced. The variation of the can be reduced. Moreover, it is possible to prevent the centrifugal impeller 1 and the fan casing 3 from coming into contact with each other and provide the electric blower 200 with high reliability.

  The housing 8 includes an opening 19 formed between the bridges 39 so that air flows into the housing 8, and an exhaust port 20 that directly discharges air to the outside without cooling the rotor core 9, the stator core 10, and the stator winding 11. Are provided.

  An inclined portion 42 is provided inside the frame 40. Air that flows out from the annular flow path 4 formed by the inner surface of the housing 8 and the outer periphery of the partition plate 2 is structured to easily flow into the opening 19 by the inclined portion 42, and the air that flows in from the opening 19 Collide with 15 The heat generated in the bearings 12 and 13 is transferred by heat conduction to the bearing cover 15 made of a nonmagnetic metal material, and the bearings 12 and 13 are effectively cooled by cooling the bearing cover 15.

  Even if the housing 8 is made of resin, the heat generated in the bearings 12 and 13 can be effectively dissipated through the bearing cover 15, and the bearings 12 and 13 can be effectively cooled, so that the electric motor is highly reliable. A blower 200 can be provided. Furthermore, since the housing 8 is made of resin, the weight can be reduced and the electric blower 200 can be reduced in weight. In this embodiment, the bearing cover 15 and the resin housing 8 are integrated by insert molding, but the bearing cover 15 may be press-fitted into the resin housing 8.

  According to the electric blower 200 of the present embodiment described above, the area of the annular flow path 4 between the inner surface of the housing 8 and the outer periphery of the partition plate 2 is larger than the area of the opening 6 of the fan casing 3. Since the outer diameter of the partition plate 2 is set so that the amount of air flowing into the annular flow path 4 can be made larger than the amount of air flowing out from the opening 6 of the fan casing 3, Can be cooled. Further, since a part of the air flowing out from the centrifugal impeller 1 is discharged from the opening 6 of the fan casing 3, the amount of air flowing into the annular channel 4 is reduced, and the flow rate in the annular channel is reduced. It is possible to suppress an increase, that is, an increase in the loss in the annular flow path portion. Further, since the space between the partition plate 2 and the fan casing 3 acts as a vaneless diffuser, the fan efficiency can be improved in a wide air flow range. Thereby, a small and lightweight electric blower that is highly efficient in a wide air volume range can be obtained.

  Further, by installing the partition plate 2 on the back side of the centrifugal impeller 1 on the side of the electric motor unit 202, the disturbance of the air flow in the electric motor unit 202 by the centrifugal impeller 1 is suppressed, thereby reducing the flow path loss of the electric motor unit 202. The increase can be suppressed, the disc friction loss of the centrifugal impeller 1 can be reduced, and the blower efficiency can be improved.

  Further, by fitting and connecting the mounting hole 23 at the end of the resin fan casing 3 and the claw-shaped protrusion 24 of the resin housing 8, the fan casing 3 can be securely fixed, and the axial direction of the fan casing 3 The positioning accuracy can be ensured. Thereby, the dispersion | variation in the clearance gap between the centrifugal impeller 1 and the recessed part 35 of the fan casing 3 can be made small, and the performance dispersion | variation in the electric blower 200 can be made small. Moreover, it can prevent that the centrifugal impeller 1 and the fan casing 3 contact, and can obtain the electric blower 200 with high reliability.

  Furthermore, since the fan casing 3, the housing 8, and the centrifugal impeller 1 are made of resin, the electric blower 200 can be reduced in weight.

  Next, a stick type vacuum cleaner 300 equipped with the electric blower 200 according to one embodiment of the present invention will be described with reference to FIGS. FIG. 8 shows a perspective view of a vacuum cleaner to which the electric blower of the present embodiment is applied. As shown in FIG. 8, the cleaner body 100 houses a dust collection chamber 101 that collects dust and an electric blower 200 (FIG. 9) that generates a suction airflow necessary for collecting dust. Reference numeral 102 denotes a holding part to which the cleaner body 100 is attached, 103 denotes a grip part provided at one end of the holding part 102, and 104 denotes a switch part for turning on and off the electric blower 200 provided in the grip part. A suction body 105 is attached to the other end of the holding part 102, and the cleaner body 100 and the suction body 105 are connected by a connection part 106. Reference numeral 107 denotes a charging stand for charging the battery unit 108 (FIG. 9).

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

  Next, the vacuum cleaner body 100 will be described with reference to a cross-sectional view schematically showing the stick-type vacuum cleaner 300 shown in FIG. An electric blower 200 that generates suction force, a battery unit 108 that drives the electric blower 200, a drive circuit 109, and a dust collection chamber 101 are disposed inside the cleaner body 100.

  The vacuum cleaner main body 100 can be removed from the holding portion 102 and used as a handy vacuum cleaner. The vacuum cleaner main body 100 is provided with a main body grip portion 110 and a mouth opening 111. 112 (FIG. 8) is a main body switch unit for turning on and off the electric blower 200 when used as a handy cleaner. The main body switch 112 can be operated even when the cleaner main body 100 is attached to the holding unit 102.

  The opening 6 provided in the fan casing 3 of the electric blower 200 is disposed so as to be on the back side of the cleaner main body 100 (on the side opposite to the main body grip 110). When the main body grip part 110 or the grip part 103 is held by hand when cleaning the floor surface, the opening 6 of the electric blower 200 faces the floor surface side, so that noise generated from the electric blower 200 is released to the floor surface side. Is done. For this reason, noise is reduced for the user who performs cleaning in terms of audibility.

  By mounting the electric blower 200 of the present invention on a small vacuum cleaner, the vacuum cleaner can be highly reliable and can be reduced in size and weight, and the suction power can be improved in a wide air volume range with low noise. .

  Next, a self-propelled electric vacuum cleaner 400 according to an embodiment of the present invention will be described with reference to FIGS. 10 and 11. Of the directions in which the self-propelled vacuum cleaner 400 (see FIG. 10a) travels, the side on which the side brush 401 is provided is the front, the vertical upward is the upward, and the direction in which the drive wheels 409 (see FIG. 10b) are facing the left. And on the right. That is, as shown in FIGS. 10 and 11, front and rear, top and bottom, and left and right are defined.

FIG. 10 a is an external perspective view of the self-propelled vacuum cleaner 400 from above, and FIG. 10 b is a bottom view. In FIG. 10, a self-propelled vacuum cleaner 400 is installed at an upper case 402 that is an upper wall (and some side walls), a lower case 403 that is a bottom wall (and some side walls), and a front part. And a bumper 404. A dust collection chamber 405 and a handle 406 for removing the dust collection chamber 405 are provided on the upper surface of the self-propelled electric vacuum cleaner 400. In the upper case 402, an operation button 407 and a display panel 408 for displaying a cleaning mode and the like are arranged.
As shown in FIG. 10 b, drive wheels 409 and a drive mechanism portion 410 for driving the drive wheels 409 are formed on the left and right sides near the center of the lower case 403. A side brush 401 and an auxiliary wheel 411 are formed on the front side of the lower case 403. A suction port 412 is formed on the rear side of the lower case 403.

  The side brush 401 is a brush that guides dust such as a corner of a room outside the main body of the self-propelled vacuum cleaner 400 to the mouthpiece 412, and a part of the brush is a plan view of the self-propelled vacuum cleaner 400. It is exposed from the main unit. The side brush 401 has three bundles of brushes extending radially at 120 ° intervals in plan view, and is disposed on the front left and right of the lower case 403. As the side brush 401 is driven by a side brush motor (not shown), the side brush 401 rotates inward (in the direction of the arrow attached to FIG. 10 b) so that dust is collected on the suction part 412. It has become.

  The auxiliary wheel 411 is an auxiliary wheel for smoothly moving the self-propelled electric vacuum cleaner 400 while keeping the self-propelled electric vacuum cleaner 400 at a predetermined height from the floor surface. The auxiliary wheel 411 is pivotally supported so as to be driven and rotated by a frictional force generated between the auxiliary wheel 411 and the floor surface along with the movement of the self-propelled electric vacuum cleaner 400, and is configured to be freely rotatable 360 ° in the horizontal direction.

  A suction port 412 is formed on the rear side from the center of the lower case 403. The suction port portion 412 is a member in which the suction port 413 is formed and the scraping brush 414 and the rotating brush 415 are accommodated. The scraping brush 414 has flocking on a part or the entire surface thereof, and is lifted about 0.5 mm from the floor surface and supported by the mouthpiece 412.

  The rotating brush 415 has a cylindrical shape and is supported by the suction port 412 so as to be rotatable and removable by a rotating brush motor (not shown). The rotating brush 415 has a plurality of hair transplants. The flocking of the rotating brush 415 includes a plurality of types of flocking such as flocking with different lengths and flocking with different hardness, and each flocking is arranged in a row in a spiral shape with respect to the rotation axis.

  A plurality of exhaust ports 416 for exhausting a part of the exhaust air from the electric blower 200 (see FIG. 11) to the outside are provided at the center of the lower case 403. The exhaust port 416 is formed obliquely so that air flows to the suction port 412 side, and the electric blower 200 (see FIG. 11) is disposed above the exhaust port 416. The inner diameter of the fan casing 3 of the electric blower 200 is gradually increased from the point A that intersects the fan casing 3 with the line connecting the center and the width direction of the opening 6 gradually increasing in the rotational direction of the centrifugal impeller 1. Therefore, the outer diameter of the fan casing 3 on the opening 6 side can be reduced. By mounting the opening 6 on the electric vacuum cleaner 400 with the opening 6 facing the upper side or the lower side of the self-propelled electric vacuum cleaner 400, the outer diameter of the fan casing 3 is not expanded in the height direction of the electric vacuum cleaner 400. As a result, expansion of dimensions can be suppressed.

  In addition, a part of the exhaust air from the electric blower 200 cools the control device 421 (FIG. 11) and the battery unit 419 (FIG. 11), and is exhausted to the outside from the exhaust port 416 and the drive mechanism unit 410.

  In the lower case, floor surface ranging sensors 417 are installed at four positions on the front, rear, left and right sides of the 403. By detecting a large step such as a staircase or the like by the floor distance measuring sensor 417, the self-propelled vacuum cleaner 400 can be prevented from dropping (from the staircase or the like).

  Next, the self-propelled electric vacuum cleaner main body 400 will be described using a cross-sectional view schematically showing the main body of the self-propelled electric vacuum cleaner 400 shown in FIG. An electric blower 200 (see FIG. 1) is disposed at a substantially central portion inside the self-propelled electric vacuum cleaner main body 400. A dust collection filter 418 and a dust collection chamber 405 are disposed on the upstream side of the air flow as viewed from the electric blower 200 and are connected to the suction unit 412. A battery unit 419 is disposed on the electric motor side of the electric blower 200 (the front side of the self-propelled vacuum cleaner 400), and a battery (secondary battery) 420 is accommodated therein. A control device 421 is disposed above the battery unit 419. The electric power from the battery 420 is supplied to the electric blower 200, each sensor, each motor, each drive device, and the control device 421.

  The opening 6 provided in the fan casing 3 of the electric blower 200 is arranged so as to be on the main body upper case 402 side. The exhaust flow from the opening 6 is exhausted from the exhaust port 416 to the floor via the electric blower storage case 422. The air exhausted from the exhaust port 20 of the electric blower 200 cools the control device 421 and the battery unit 419 and is exhausted to the outside from the exhaust port 416 of the self-propelled electric vacuum cleaner 400 and the drive mechanism unit 410. .

  Here, an elastic body 423 is installed on the outer peripheral surface of the electric blower 200. By interposing the elastic body 423 between the electric blower 200 and the electric blower storage case 422, the vibration of the electric blower 200 is attenuated and hardly transmitted to the self-propelled electric vacuum cleaner 400, thereby reducing vibration and noise. it can.

  In the above configuration, when the operation button 407 is operated, the electric blower 200 is operated to generate a suction airflow. Then, dust is sucked from the suction port 413, guided to the dust collection chamber 405, and dust is removed by the dust collection filter 418. The air from which the dust has been removed flows into the electric blower 200 and is exhausted from the opening 6 and the exhaust port 20 of the electric blower 200. The air exhausted from the electric blower 200 is exhausted to the outside from the exhaust port 416 provided in the lower case 403 and the drive mechanism unit 416 of the self-propelled vacuum cleaner 400 via the electric blower storage case 422.

  The air exhausted from the exhaust port 416 of the lower case 403 flows toward the suction port 412 disposed in the lower case 403, and thus acts to transport dust scraped by the side brush 401 to the suction port 412 side. Therefore, the dust collection performance of the self-propelled electric vacuum cleaner 400 is improved.

  Further, since the lower case 403 is provided with the exhaust port 416 directed toward the floor surface, noise generated from the electric blower 200 is released to the floor surface side, so that noise can be suppressed for the user who is indoors. When the opening 6 of the electric blower 200 is arranged so as to face the upper case 402 side, noise radiated from the opening 6 is covered with a double wall of the electric blower storage case 422 and the upper case 402. Therefore, the noise radiated from the electric blower 200 is sound-insulated. Moreover, since the flow path length from the opening part 6 of the electric blower 200 to the exhaust port 416 of the lower case 403 can be increased, noise can be reduced because sound energy is attenuated.

  In this embodiment, the opening 6 of the electric blower 200 is arranged so as to face the upper case 402 side. However, by arranging the opening 6 on the lower case 403 side, the distance between the opening 6 and the exhaust port 416 is shortened. As a result, the exhaust passage loss can be suppressed, and the suction force can be further improved. Further, noise radiated from the upper surface of the upper case 402 can be reduced.

  Moreover, the expansion of the self-propelled vacuum cleaner 400 in the height direction can be suppressed by mounting the opening 6 of the electric blower 200 toward the upper side or the lower side of the vacuum cleaner 400. For this reason, it can enter into places where height is restricted, such as under a bed, and can clean a wide range.

  By mounting the electric blower 200 of the present invention on a self-propelled electric vacuum cleaner, the vacuum cleaner can be highly reliable, reduced in size and weight, and improved in suction power in a wide air volume range with low noise. Can do.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Centrifugal impeller 2 Partition plate 3 Fan casing 4 Ring flow path 5 Air suction inlet 6 Opening part 7 Rotating shaft 8 Housing 9 Rotor core 10 Stator core 11 Stator winding 12 Bearing 13 Bearing 14 Spring 15 Bearing cover 16 Support part 17 Screw hole 18 Screw 19 Opening 20 Exhaust port 21 Stator core fixing screw 22 Protrusion 23 Mounting hole 24 Claw-like protrusion 25 Shroud plate 26 Hub plate 27 Blade 28 Suction opening 29 Concave groove 30 Boss 31 Collar 32 Upper plate portion 33 Curved surface portion 34 Outer peripheral portion 35 Concave portion 36 Inflow flow 37 Outflow flow 38 Radial flow 39 Bridge 40 Frame 41 Screw hole 42 Inclined portion 100 Vacuum cleaner body 200 Electric blower 201 Blower portion 202 Electric motor portion

Claims (6)

  An electric motor including a rotor and a stator; a rotary shaft provided rotatably; the rotor integrally formed at one end of the rotary shaft; and a rotor blade attached to the other end of the rotary shaft; A bearing cover attached to the rotary shaft between the rotor and the rotor blade, the bearing cover including the bearing, a housing integrally formed with the bearing cover, and the electric motor of the rotor blade A partition plate disposed on a side of the housing, and a fan casing provided on the rotor blade side of the housing and covering the rotor blade, wherein an annular flow path is formed between an outer peripheral side of the partition plate and the housing, and the fan An electric blower comprising an opening in a part of an outer peripheral portion of a casing.   The electric blower according to claim 1, wherein the annular flow passage area is larger than the area of the opening of the fan casing.   Extending the line connecting the center of the wide side of the opening in the width direction and the center of the fan casing, the inner diameter of the outer peripheral portion of the fan casing from the point of intersection with the fan casing toward the rotation direction of the rotor blades The electric blower according to claim 1 or 2, characterized by gradually increasing.   The electric blower according to any one of claims 1 to 3, wherein the housing and the fan casing are made of resin.   The vacuum cleaner carrying the electric blower of any one of Claims 1 thru | or 4.   6. The electric vacuum cleaner according to claim 5, wherein an exhaust port provided in a vacuum cleaner body for exhausting exhaust air from an opening of the fan casing of the electric blower is disposed on the floor surface side.

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