CN115614302A

CN115614302A - Air supply device and dust collector with same

Info

Publication number: CN115614302A
Application number: CN202210818769.9A
Authority: CN
Inventors: 布川彩夏; 藤原阳和
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2021-07-15
Filing date: 2022-07-13
Publication date: 2023-01-17
Also published as: JP2023013053A

Abstract

The invention provides an air supply device and a dust collector with the same. The blower includes a rotor blade that rotates around a central axis, a motor that rotates the rotor blade, and a stator blade that is disposed axially below the rotor blade. The stator blade has an inner tube portion extending in the axial direction and a blade portion. The blade portions project radially outward from the outer peripheral surface of the inner cylindrical portion, and are arranged in a plurality of circumferential directions. Each blade portion is divided into an upper blade portion disposed axially above the dividing line and a lower blade portion disposed axially below the dividing line. In circumferentially adjacent upper blade portions, an upper end of an upper blade portion disposed on one circumferential side is disposed apart from a lower end of an upper blade portion disposed on the other circumferential side toward one circumferential side, and in circumferentially adjacent lower blade portions, an upper end of a lower blade portion disposed on one circumferential side is disposed apart from a lower end of a lower blade portion disposed on the other circumferential side toward one circumferential side.

Description

Air supply device and dust collector with same

Technical Field

The invention relates to a blowing device and a dust collector with the blowing device.

Background

A conventional air blower includes a rotor blade that rotates around a central axis, a motor that rotates the rotor blade, and a stator blade that is disposed axially below the rotor blade. The stator blades (vane portions) project radially outward from a radially outer surface of a 1 st casing (inner tube portion) that houses the motor, and are arranged in a plurality of circumferential directions. By disposing the stationary blades adjacent in the circumferential direction in close proximity and forming the stationary blades to be long in the flow direction of the airflow, the airflow can be smoothly circulated (see, for example, patent document 1).

Patent document 1: japanese patent laid-open No. 2020-186653

However, in the conventional blower device, when the stationary blades (blade portions) adjacent to each other in the circumferential direction are arranged close to each other and molded long in the flow direction of the airflow, it is difficult to remove the stationary blades from the mold, and the manufacturing cost may increase.

Disclosure of Invention

The invention aims to provide an air supply device which can easily demold to reduce the manufacturing cost and can smoothly circulate air flow.

An exemplary blower according to the present invention includes a rotor blade that rotates about a central axis, a motor that rotates the rotor blade, and a stator blade that is disposed axially below the rotor blade. The stationary blade has an inner cylinder portion and a blade portion extending in the axial direction. The blade portions project radially outward from the outer peripheral surface of the inner cylindrical portion, and are arranged in a plurality of circumferential directions. The blade portions extend so as to be inclined axially downward toward one circumferential direction. Among the circumferentially adjacent blade portions, the upper end of the blade portion disposed on one circumferential side is disposed on the other circumferential side than the lower end of the blade portion disposed on the other circumferential side. The stationary blade is divided in the axial direction along a dividing line extending in the circumferential direction on the outer peripheral surface of the inner cylindrical portion across the blade portion. Each blade portion is divided into an upper blade portion disposed axially above the dividing line and a lower blade portion disposed axially below the dividing line. In circumferentially adjacent upper blade portions, an upper end of an upper blade portion disposed on one circumferential side is disposed apart from a lower end of an upper blade portion disposed on the other circumferential side toward one circumferential side, and in circumferentially adjacent lower blade portions, an upper end of a lower blade portion disposed on one circumferential side is disposed apart from a lower end of a lower blade portion disposed on the other circumferential side toward one circumferential side.

According to the exemplary invention, it is possible to provide an air blowing device that can be easily released from a mold, reduce manufacturing cost, and smoothly circulate an air flow.

Drawings

Fig. 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of the air blowing device according to the embodiment of the present invention.

Fig. 3 is a perspective view of a stationary blade of the blower according to the embodiment of the present invention.

Fig. 4 is a side view of a stationary blade of the blower according to the embodiment of the present invention.

Fig. 5 is an enlarged side view of a part of a stationary blade of the blower device according to the embodiment of the present invention.

Fig. 6 is an enlarged side view of a part of a stationary blade of the blower according to the embodiment of the present invention.

Fig. 7 is an enlarged side view of a part of a stationary blade of the blower according to the embodiment of the present invention.

Description of the reference symbols

1: an air supply device; 10: a housing; 11: an air suction port; 12: an air outlet; 13: an air flow path; 20: moving blades; 30: a motor; 31: a shaft; 32a, 32b: a bearing portion; 33: a stator; 34: a rotor; 35: a circuit board; 40: a stationary blade; 41: an inner cylinder part; 41a: an upper surface portion; 41b: a through hole; 42: a blade section; 43: an outer cylinder portion; 45: dividing the lines; 45a, 45b: a bending part; 50: an upper bearing retainer; 51: an outer wall portion; 52: an inner wall portion; 53: an upper support section; 54: an upper holding portion; 60: a lower bearing retainer; 61: a lower holding portion; 62: a lower support portion; 100: a vacuum cleaner; 101: a housing; 102: a nozzle; 103: an air intake part; 104: an exhaust section; 331: a stator core; 332: an insulating member; 333: a coil; 342: a rotor magnet; 411: an upper inner cylinder part; 412: a lower inner cylinder part; 421: an upper blade section; 422: a lower blade section; 431: an upper outer cylinder section; 432: a lower outer cylinder part; j: a central axis; p1: an upper end; p2: a lower end; p3: an upper end; p4: a lower end; s: a gap.

Detailed Description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, a direction parallel to the central axis J of the air blowing device 1 is referred to as an "axial direction", a direction perpendicular to the central axis J of the air blowing device 1 is referred to as a "radial direction", and a direction along an arc centered on the central axis J of the air blowing device 1 is referred to as a "circumferential direction". In the present description, the shape and positional relationship of each portion will be described with respect to the rotor blade 20 with the stator 33 side facing downward in fig. 1, with the axial direction as the vertical direction. The vertical direction is a name used for simplicity of explanation, and does not limit the actual positional relationship and direction in the vacuum cleaner 100.

(1. Integral Structure of vacuum cleaner)

Hereinafter, a vacuum cleaner 100 according to an exemplary embodiment of the present invention will be described. Fig. 1 is a perspective view of a vacuum cleaner 100 according to the present embodiment. The vacuum cleaner 100 is a so-called stick type electric vacuum cleaner, and includes a nozzle 102 at one end of a housing 101, and an air suction unit 103 at a tip of the nozzle 102. An exhaust portion 104 is provided on the other end side of the casing 101. An air passage (not shown) for communicating the air intake unit 103 and the air exhaust unit 104 is formed in the housing 101 and the nozzle 102. A dust collecting unit (not shown), a filter (not shown), and the air blowing device 1 are arranged in this order from the upstream side toward the downstream side in the air passage. That is, the vacuum cleaner 100 has the blower 1.

By driving the blower 1, the air flow sucked from the air intake unit 103 flows through the air passage via the dust collecting chamber and the filter, and is discharged from the exhaust unit 104 to the outside of the casing 101. Dust and other dust contained in the air flow flowing through the air passage is blocked by the filter and collected in the dust collecting part. In addition, the vacuum cleaner 100 may be a robot type, a canister type, or a hand-held type electric vacuum cleaner, in addition to a stick type.

(2. Structure of air supply device)

Fig. 2 is a longitudinal sectional view of the blower 1. The blower 1 includes a casing 10, rotor blades 20, a motor 30, stator blades 40, an upper bearing holder 50, and a lower bearing holder 60. The casing 10 is made of metal, and houses the rotor blades 20, the stator blades 40, the motor 30, the upper bearing holder 50, and the lower bearing holder 60 inside. The casing 10 is formed in a tubular shape, and has an air inlet 11 opened in an upper surface thereof and an air outlet 12 opened in a lower surface thereof. An airflow path 13 connecting the air inlet 11 and the air outlet 12 is formed inside the casing 10. The housing 10 is not limited to metal, and may be molded from resin, for example.

The upper bearing holder 50 has an outer wall portion 51, an inner wall portion 52, an upper holding portion 54, and an upper supporting portion 53. The outer wall 51 is formed in a cylindrical shape and contacts the inner circumferential surface of the housing 10. The inner wall portion 52 is formed in an annular shape, and is disposed radially inward of the outer wall portion 51 with a gap therebetween via a connection portion (not shown). A part of the air flow path 13 is formed between the outer wall portion 51 and the inner wall portion 52 in the radial direction. The upper holding portion 54 is formed in a cylindrical shape, and holds a bearing portion 32a described later therein. The upper support portion 53 extends radially inward from the inner peripheral surface of the inner wall portion 52 and is connected to the upper holding portion 54. In the present embodiment, the upper support portions 53 are provided at 3 positions at equal intervals in the circumferential direction.

The lower bearing holder 60 has a lower holding portion 61 and a lower supporting portion 62. The lower holding portion 61 is formed in a cylindrical shape, and holds a bearing portion 32b described later therein. The lower support portion 62 extends radially outward from the outer peripheral surface of the lower holding portion 61. In the present embodiment, the lower support portions 62 are provided at 3 positions at equal intervals in the circumferential direction.

The rotor blade 20 is made of resin. The rotor blade 20 is disposed axially above the motor 30. The rotor blade 20 is rotated about the central axis J by the motor 30. The rotor blade 20 may be a metal component.

The stationary blades 40 are arranged axially below the rotor blades 20 in the airflow passage 13. By providing the stationary blades 40, the airflow flowing through the stationary blades 40 can be rectified and the airflow in the airflow passage 13 can be smoothly circulated. The shape of the stationary blade 40 will be described in detail later.

The motor 30 rotates the moving blade 20 about the central axis J. The motor 30 includes a shaft 31, a pair of bearing

portions

32a and 32b, a stator 33, a rotor 34, and a circuit board 35.

The stator 33 is disposed radially inward of the outer wall 51 with a gap therebetween. The stator 33 and the outer wall portion 51 are fixed via a projection (not shown) that projects radially inward from the outer wall portion 51. The stator 33 includes a stator core 331, an insulator 332, and a coil 333.

The stator core 331 is formed by stacking electromagnetic steel plates one on top of another, for example. The insulating material 332 is made of resin having insulating properties. The insulator 332 is provided so as to surround the outer surface of the stator core 331. The coil 333 is formed of a conductive wire wound around the stator core 331 with an insulator 332 interposed therebetween.

The rotor 34 rotates about the central axis J with respect to the stator 33. The rotor 34 has a rotor magnet 342. The rotor magnet 342 has a cylindrical shape, and the shaft 31 is fixed inside.

The shaft 31 extends along the central axis J. The shaft 31 is a columnar member made of metal such as stainless steel and extending upward and downward along the shaft.

The pair of bearing

portions

32a and 32b support the shaft 31 rotatably about the center axis J on both sides in the axial direction via the rotor magnet 342. The bearing

portions

32a and 32b are formed of, for example, ball bearings, but may be formed of sleeve bearings or the like.

The circuit board 35 is disposed axially below the motor 30. The circuit board 35 has a disk shape extending in the radial direction around the central axis J, for example. Lead wires of a coil (not shown) are electrically connected to the circuit board 35.

In the blower device 1 having the above-described configuration, when a drive current is supplied to a coil (not shown) of the motor 30 via the circuit board 35, the stator core 331 generates a magnetic flux in the radial direction. The magnetic field generated by the magnetic flux of the stator core 331 and the magnetic field generated by the rotor magnet 342 act to generate a torque in the circumferential direction of the rotor 34. The rotor 34 and the rotor blade 20 rotate about the central axis J by the torque.

When the rotor blade 20 rotates, an airflow is generated, passes through the stationary blades 40 in the airflow passage 13, and is blown out from the blow-out port 12 toward the lower side in the axial direction. At this time, the motor 30 disposed inside the casing 10 is cooled by the airflow flowing through the airflow passage 13.

(3. Construction of stationary blade)

Fig. 3 is a perspective view of the stationary blade 40, and fig. 4 is a side view of the stationary blade 40. In fig. 4, the outer tube 43 is not shown to explain the shape of the blade 42. The stationary blade 40 includes an inner cylinder 41, a blade 42, and an outer cylinder 43. The inner tube portion 41, the vane portion 42, and the outer tube portion 43 are axially divided along a dividing line 45 extending in the circumferential direction.

The inner cylinder portion 41 is formed in a cylindrical shape extending in the axial direction. The upper surface of the inner tube 41 is covered with the upper surface portion 41a, and the lower surface of the inner tube 41 is open. A through hole 41b is opened in the center axis J of the upper surface portion 41 a. The upper surface portion 41a is disposed on the upper surface of the upper bearing holder 50, and the upper holding portion 54 is disposed inside the through hole 41b (see fig. 1). The inner tube portion 41 is disposed radially outward of the inner wall portion 52 of the upper bearing holder 50.

The vane portions 42 project radially outward from the outer peripheral surface of the inner cylindrical portion 41, and are arranged in a plurality in the circumferential direction. The blade portions 42 extend so as to be inclined axially downward toward one circumferential direction (X1 direction). In the present embodiment, the blade portions 42 are arranged at equal intervals in the circumferential direction. Each blade 42 is curved convexly upward in the axial direction.

Among the blade portions 42 adjacent in the circumferential direction, the upper end P1 of the blade portion 42 disposed on one side (the X1 direction side) in the circumferential direction is disposed on the other side (the X2 direction side) in the circumferential direction than the lower end P4 of the blade portion 42 disposed on the other side (the X2 direction side) in the circumferential direction. Thereby, the adjacent blade portions 42 are arranged close to each other in the circumferential direction, and the stationary blades 40 can further rectify the airflow.

The outer tube 43 is formed in a cylindrical shape by connecting the outer peripheral end surfaces of adjacent blade portions 42. The outer tube 43 is disposed in contact with the inner circumferential surface of the housing 10. By providing the outer tube 43, the strength of the blade 42 is improved.

The dividing line 45 extends in the circumferential direction across the blade portions 42 on the outer circumferential surface of the inner cylindrical portion 41 and the outer circumferential surface of the outer cylindrical portion 43. Thereby, the stationary blade 40 is axially divided along the dividing line 45. The dividing line 45 includes a bent portion 45a bent in the axial direction in the blade portion 42 and a bent portion 45b bent in the axial direction in the inner tube portion 41. The bent portions 45a and the bent portions 45b are arranged at equal intervals in the circumferential direction.

Each blade portion 42 is divided into an upper blade portion 421 disposed axially above the dividing line 45 and a lower blade portion 422 disposed axially below the dividing line 45. The inner tube portion 41 is divided into an upper inner tube portion 411 disposed axially above the dividing line 45 and a lower inner tube portion 412 disposed axially below the dividing line 45. The outer tube portion 43 is divided into an upper outer tube portion 431 disposed axially above the dividing line 45 and a lower outer tube portion 432 disposed axially below the dividing line 45.

The upper inner cylindrical portion 411, the upper blade portion 421, and the upper outer cylindrical portion 431 are integrally molded with resin by a mold. At this time, of the upper blade portions 421 adjacent in the circumferential direction, the upper end P1 of the upper blade portion 421 disposed on one side (the X1 direction side) in the circumferential direction is disposed apart from the lower end P2 of the upper blade portion 421 disposed on the other side (the X2 direction side) in the circumferential direction toward the one side (the X1 direction side) in the circumferential direction. This facilitates the removal of the upper blade 421. The distance between the upper end P1 of the upper blade portion 421 and the lower end P2 of the upper blade portion 421 in the circumferential direction is preferably 1mm or more.

The lower inner tube portion 412, the lower blade portion 422, and the lower outer tube portion 432 are integrally molded with resin by a mold. At this time, of the lower blade portions 422 adjacent to each other in the circumferential direction, the upper end P3 of the lower blade portion 422 disposed on one side (the X1 direction side) in the circumferential direction is disposed apart from the lower end P4 of the lower blade portion 422 disposed on the other side (the X2 direction side) in the circumferential direction toward the one side (the X1 direction side) in the circumferential direction. This facilitates the release of the lower blade portion 422.

The stationary blade 40 is formed by axially connecting an upper inner tube 411, an upper blade 421, and an upper outer tube 431, which are integrally molded with resin, and a lower inner tube 412, a lower blade 422, and a lower outer tube 432, which are integrally molded with resin. This makes it possible to easily remove the members constituting the stationary blade 40 from the mold and reduce the manufacturing cost. The adjacent blade portions 42 are disposed close to each other in the circumferential direction, and the blade portions 42 are formed long in the flow direction (axial direction) of the airflow. This can further rectify the airflow. Therefore, the stationary blades 40 can smoothly circulate the airflow.

In the present embodiment, 2 resin molded articles are axially connected to form the stationary blades 40, but 3 or more resin molded articles may be axially connected to form the stationary blades 40.

In each blade 42, the lower end of the upper blade 421 contacts the upper end of the lower blade 422. This can further suppress leakage of the airflow flowing over the blade 42 from the gap in the circumferential direction.

The dividing line 45 has the

bent portions

45a and 45b, and when the upper inner tube portion 411 and the lower inner tube portion 412 are connected, positioning in the circumferential direction can be easily performed. Further, by providing the bent portions 45a in the vane portions 42, the leakage of the airflow flowing through the vane portions 42 from the gap in the circumferential direction can be further suppressed.

(4. Other)

The embodiments of the present invention have been described above. The scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by variously changing the above-described embodiments without departing from the scope of the present invention. Note that the matters described in the above embodiments can be arbitrarily combined as appropriate.

Fig. 5, 6, and 7 are enlarged side views of a part of the stationary blade 40, and show modifications of the blade portion 42. In the present embodiment shown in fig. 4 described above, 1 bent portion 45a is provided in each blade portion 42, but a plurality of bent portions 45a may be provided in each blade portion 42 as shown in fig. 5. This can further suppress leakage of the airflow flowing over the blade 42 from the gap in the circumferential direction.

As shown in fig. 6, each blade 42 may be divided by a straight dividing line 45 without providing the bent portion 45a. This can prevent a gap from being formed between the upper inner tube portion 411 and the lower inner tube portion 412 due to poor accuracy of the bent portion 45a.

As shown in fig. 7, in each blade 42, a gap S may be formed between the lower end of the upper blade 421 and the upper end of the lower blade 422. This can further prevent a gap from being formed between the upper inner tube portion 411 and the lower inner tube portion 412 due to poor accuracy of the joint surface of the lower end of the upper blade portion 421 and the joint surface of the upper end of the lower blade portion 422.

Industrial applicability

The present invention can be used for home electric appliances having an air blower.

Claims

1. An air supply device includes:

a rotor blade that rotates around a central axis;

a motor that rotates the rotor blade; and

stationary blades arranged axially below the rotor blades,

the stator blade has:

an inner cylinder portion extending in an axial direction; and

a plurality of blade portions that protrude radially outward from an outer peripheral surface of the inner cylindrical portion and are arranged in a circumferential direction,

the blade portions extend so as to be inclined toward the lower side in the axial direction as they extend in one circumferential direction,

in the circumferentially adjacent blade portions, an upper end of the blade portion disposed on one circumferential side is disposed on the other circumferential side than a lower end of the blade portion disposed on the other circumferential side,

the stationary blade is divided in the axial direction along a dividing line extending in the circumferential direction on the outer peripheral surface of the inner cylindrical portion across the blade portion,

each of the blade portions is divided into an upper blade portion disposed axially above the dividing line and a lower blade portion disposed axially below the dividing line,

in the circumferentially adjacent upper blade portions, an upper end of the upper blade portion disposed on one circumferential side is disposed apart from a lower end of the upper blade portion disposed on the other circumferential side toward the one circumferential side,

in the circumferentially adjacent lower blade portions, an upper end of the lower blade portion disposed on one circumferential side is disposed apart from a lower end of the lower blade portion disposed on the other circumferential side in the circumferential direction.

2. The air supply arrangement of claim 1,

the dividing line has a bent portion bent in the axial direction at each blade portion.

3. The air supply arrangement of claim 2,

the bent portion is provided in plurality on each blade portion.

4. The air supply device according to any one of claims 1 to 3,

in each of the blade portions, a lower end of the upper blade portion is in contact with an upper end of the lower blade portion.

5. The air supply device according to any one of claims 1 to 3,

in each of the blade portions, a gap is formed between a lower end of the upper blade portion and an upper end of the lower blade portion.

6. The air supply device according to any one of claims 1 to 3,

the stator blade further includes an outer cylindrical portion formed in a cylindrical shape by connecting outer peripheral end surfaces of the adjacent blade portions,

the dividing line extends in a circumferential direction on an outer peripheral surface of the outer cylinder portion, and the outer cylinder portion is divided in an axial direction along the dividing line.

7. A vacuum cleaner is provided, in which,

the vacuum cleaner has the air blowing device of any one of claims 1 to 6.