US20230016055A1 - Air blower - Google Patents
Air blower Download PDFInfo
- Publication number
- US20230016055A1 US20230016055A1 US17/951,347 US202217951347A US2023016055A1 US 20230016055 A1 US20230016055 A1 US 20230016055A1 US 202217951347 A US202217951347 A US 202217951347A US 2023016055 A1 US2023016055 A1 US 2023016055A1
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- United States
- Prior art keywords
- air inlet
- case
- air
- impeller
- flow channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/051—Axial thrust balancing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/10—Centrifugal pumps for compressing or evacuating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/052—Axially shiftable rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
Definitions
- the present disclosure relates to an air blower using, for example, a centrifugal fan.
- An air blower using, for example, a centrifugal fan comprises an impeller, motor configured to rotate the impeller, air inlet provided in the rotational axis direction of the impeller, and air outlet arranged in a direction perpendicular to the air inlet.
- a pressure difference is created between the top surface side (air inlet side) and undersurface side relative to the rotational axis direction of the impeller, whereby the motor shaft and impeller are moved in the thrust direction (rotational axis direction) and impeller is brought into contact with the housing of the air blower.
- Patent Literature 1 JP 2006-129638 A
- An embodiment described herein aims to provide an air blower capable of suppressing movement of an impeller thereof in the thrust direction.
- An air blower of this embodiment includes a first case including a first air inlet and a first air outlet, a second case provided inside the first case and including a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet, an impeller being provided inside the second case, a rotational axis of which is made coincident with a central axis of each of the first air inlet and the second air inlet, and serving as a centrifugal fan, a motor being provided inside the second case and to rotate the impeller, a first flow channel provided between the motor and the second case on the opposite side of the first air inlet of the impeller and the second air inlet, and a second flow channel provided between the first case and the second case and communicating with the first flow channel, the first air inlet, and the second air inlet.
- FIG. 1 is a top view showing an air blower according to an embodiment of the present disclosure.
- FIG. 2 is a cross-sectional view along line II-II of FIG. 1 .
- FIG. 3 is a perspective exploded view showing a part of FIG. 1 .
- FIG. 4 is a perspective view showing another part of FIG. 1 .
- FIG. 5 is a view showing a function of FIG. 1 and is a cross-sectional view along line V-V of FIG. 1 .
- FIG. 6 is a cross-sectional view showing a part A of FIG. 5 in an enlarged form.
- FIG. 1 shows an air blower 10 according to this embodiment.
- the air blower 10 comprises a top case 11 serving as a housing, and top case 11 has an approximately cylindrical shape and includes an air inlet (first air inlet) 11 a and air outlet (first air outlet) 11 b .
- the air inlet 11 a is arranged on a top surface of the top case 11 and at a central part thereof, and air outlet 11 b is arranged on a side surface of the top case 11 and in a direction approximately perpendicular to the air inlet 11 a.
- an inner case 12 is provided inside the top case 11 .
- the inner case 12 is divided into a first inner case 12 - 1 on the lower side and second inner case 12 - 2 on the upper side.
- the inner case 12 is not necessarily divided, and may be integrally configured.
- the inner case 12 includes an air inlet (second air inlet) 12 a communicating with the air inlet 11 a of the top case 11 and air outlet (second air outlet) 12 b communicating with the air outlet 11 b of the top case 11 .
- the inner diameter of the air inlet 12 a of the inner case 12 is greater than the inner diameter of the air inlet 11 a of the top case 11 , and air inlet 11 a is arranged inside the air inlet 12 a . Accordingly, the air inlet 11 a and air inlet 12 a are arranged concentric with each other.
- a flow channel (first flow channel) (CH3) to be described later is provided between the inner case 12 and top case 11 . That is, a part of the inner case 12 is separate from an inner surface of the top case 11 and the flow channel (CH3) is formed at this part.
- a base 13 is attached by a plurality of screws 14 .
- a base plate 15 is provided between the lower part of each of the top case 11 and inner case 12 and base 13 .
- the base plate 15 is fixed to the base 13 by a plurality of screws 16 .
- a ring-shaped gasket 18 serving as a sealing member is provided and, also between the circumference of the base plate 15 and base 13 , a ring-shaped gasket 19 serving as a sealing member is provided.
- the gaskets 18 and 19 are each constituted of an elastic body such as rubber. A gap between the top case 11 and base plate 15 is blocked by the gasket 18 and, gap between the base 13 and base plate 15 is blocked by the gasket 19 . Accordingly, the top case 11 and base 13 are sealed up and air is prevented from leaking out of the top case 11 and base 13 .
- an opening portion 15 a is provided at a central part of the base plate 15 and a stator 17 a of a motor 17 is arranged inside the opening portion 15 a .
- the stator 17 a is cylindrical and is accommodated in a concave portion 13 a provided at a central part of the base 13 .
- An inner diameter of the opening portion 15 a of the base plate 15 is equal to or slightly greater than an outer diameter of the stator 17 a and a plurality of concave portions 15 b is provided in an inner circumference of the opening portion 15 a . Accordingly, a plurality of gaps is formed between the base plate 15 and stator 17 a by the plurality of concave portions 15 b.
- a plurality of opening portions 15 c is provided in a circumferential part of the base plate 15 . These opening portions 15 c are positioned outside the inner case 12 and inside the top case 11 and are arranged in a one-to-one correspondence with a plurality of concave portions 13 b provided on the base 13 .
- the concave portions 13 b of the base 13 , concave portions 15 b of the base plate 15 , and opening portions 15 c constitute a flow channel (CH2) communicating with the aforementioned flow channel (CH3) between the inner case 12 and top case 11 .
- the motor 17 is arranged inside the inner case 12 , more specifically, the motor 17 is arranged inside the first inner case 12 - 1 .
- the motor 17 includes the aforementioned stator 17 a , sleeve 17 b , shaft 17 c , bearing 17 d , a plurality of coils 17 e , a plurality of yokes 17 f , rotor holder 17 g , permanent magnet 17 h , and shaft holder 17 i.
- the sleeve 17 b is provided inside the stator 17 a and shaft 17 c is arranged inside the sleeve 17 b .
- the fixed portion of the bearing 17 d is fixed to the inside of the sleeve 17 b and rotating portion of the bearing 17 d is fixed to a first end of the shaft 17 c .
- the shaft 17 c retained by the bearing 17 d inside the sleeve 17 and is retained in the thrust direction by the magnetic force.
- the sleeve 17 b and shaft 17 c may constitute an aerodynamic pressure bearing.
- the plurality of yokes 17 f around which the plurality of coils 17 e is each wound are arranged around the stator 17 a .
- the shaft holder 17 i is fixed to a second end of the shaft 17 c , and rotor holder 17 g is retained inside the shaft holder 17 i .
- the permanent magnet 17 h is cylindrical and is fixed to the inside of the rotor holder 17 g .
- An inner surface of the permanent magnet 17 h is arranged separate from the plurality of yokes 17 f.
- An outer surface of the shaft holder 17 i is separated from an inner surface of the first inner case 12 - 1 , and a gap formed between the outer surface of the shaft holder 17 i and first inner case 12 - 1 constitute a flow channel (CH1).
- CH1 flow channel
- the configuration of the motor 17 is not limited to the above and can be modified.
- An impeller 20 is arranged inside the second inner case 12 - 2 and is attached to an upper part of the shaft holder 17 i.
- the impeller 20 is a centrifugal fan and is, for example, a so-called turbofan.
- the impeller 20 is not limited to the turbofan.
- the impeller 20 comprises an air inlet (third air inlet) 20 a , a plurality of air outlets (third air outlets) 20 b , and plurality of blades 20 c .
- the air inlet 20 a is provided at a central part of the top surface (first surface) 20 d of the impeller 20 , and plurality of air outlets is arranged along the outer circumference of the impeller 20 .
- the plurality of blades 20 is arranged between the top surface 20 d of the impeller 20 and undersurface (second surface) 20 e thereof and between the air inlet 20 a and plurality of air outlets 20 b.
- a ring-shaped protruding portion 20 f is provided on the top surface 20 d of the impeller 20 and around the air inlet 20 a .
- the air inlet 20 a thereof is opposed to the air inlet 11 a of the top case 11 and air inlet 12 a of the inner case 12 .
- Each of the top surface 20 d of the impeller 20 , undersurface 20 e thereof, and side surface thereof in which the air outlets 20 b are provided is separated from the inner surface of the second inner case 12 - 2 and a gap is formed therebetween.
- a ring-shaped concave portion 12 c is provided, and protruding portion 20 f of the impeller 20 is arranged inside the concave portion 12 c .
- a gap communicating with the gap provided between the top surface 20 d of the impeller 20 and inner surface of the second inner case 12 - 2 is formed.
- This gap constitutes a flow channel (second flow channel) (CH4).
- the gap formed by the concave portion 12 c and protruding portion 20 f is made to communicate with the air inlet 11 a of the top case 11 and air inlet 12 a of the inner case 12 .
- the inner surface of the air inlet 11 a of the top case 11 , inner surface of the air inlet 12 a of the inner case 12 , and ring-shaped gap between the protruding portion 20 f of the impeller 20 and concave portion 12 c of the second inner case 12 - 2 are parallel to each other. Accordingly, the direction of air flowing out of the ring-shaped flow channel is parallel to the direction of air flowing into each of the air inlet 11 a of the top case 11 and air inlet 12 a of the second inner case 12 - 2 .
- the gap between the top surface 20 d of the impeller 20 and second inner case 12 - 2 is greater than the ring-shaped gap (gap in the radial direction (direction perpendicular to the rotational axis)) between the protruding portion 20 f of the impeller 20 and concave portion 12 c of the second inner case 12 - 2 , and functions as a valve chamber configured to control the flow of air.
- a gap (a part of the flow channel CH3) similar to that on the top surface 20 d side of the impeller 20 is provided, and the pressure on the top surface 20 d of the impeller 20 and pressure on the undersurface 20 e thereof are equally maintained by the gap on the top surface 20 d side of the impeller 20 and gap on the undersurface 20 e side thereof. Accordingly, movement of the impeller 20 in the thrust direction is suppressed.
- the ring-shaped gap between the protruding portion 20 f of the impeller 20 and concave portion 12 c of the second inner case 12 - 2 is less than the gap between the top surface 20 d of the impeller 20 and second inner case 12 - 2 and functions as a choke (second choke) 21 configured to narrow the flow of air.
- the ring-shaped gap between the inner surface of the air inlet 12 a of the second inner case 12 - 2 and outer surface of the air inlet 11 a of the top case 11 is less than the gap between the undersurface 20 e of the impeller 20 and second inner case 12 - 2 or gap between the top case 11 and inner case 12 and functions as a choke (first choke) 22 configured to narrow the flow of air.
- the ring-shaped choke 21 is arranged outside the air inlet 11 a and air inlet 12 a and direction of the flow of air flowing out of the choke 21 is parallel to the direction of the flow of air sucked from the air inlet 11 a and air inlet 12 a .
- the choke 21 is arranged in parallel with the inner surface of the air inlet 11 a of the top case 11 and inner surface of the air inlet 12 a of the inner case 12 .
- the ring-shaped choke 22 is arranged between the air inlet 11 a and air inlet 12 a and direction of the flow of air flowing out of the choke 22 is parallel to the direction of the flow of air flowing out of the air inlet 11 a , air inlet 12 a , and choke 21 . That is, the choke 22 is arranged in parallel with the choke 21 .
- part of the air inside the inner case 12 is introduced into the air inlet 20 a of the impeller 20 from the part between the air inlet 11 a of the top case 11 and air inlet 12 a of the inner case 12 through the flow channel CH1 between the motor 17 and inner case 12 (first inner case 12 - 1 ), flow channel CH2 extending through the opening portion 15 a and concave portions 15 b of the base plate 15 , concave portions 13 b of the base 13 , and opening portions 15 c of the base plate 15 , flow channel CH3 between the top case 11 and inner case 12 , and choke 22 .
- the air on the lower side of the impeller 20 is guided to the upper side (upper side of the impeller 20 ) of the inner case 12 through the flow channels CH1, CH2, and CH3 and choke 22 and is introduced into the air inlet 20 a of the impeller 20 together with the air introduced from the air inlet 11 a of the top case 11 . Accordingly, it is possible to suppress movement of the impeller 20 in the thrust direction.
- part of the air inside the inner case 12 is introduced into the air inlet 20 a of the impeller 20 through the flow channel CH4 between the top surface (first surface) 20 d of the impeller 20 and inner case 12 (second inner case 12 - 2 ) and choke 21 together with the air passing through the flow channel CH3 and choke 22 and air introduced from the air inlet 11 a of the top case 11 .
- the direction of the air introduced from the choke 21 into the air inlet 20 a of the impeller 20 is made parallel to the direction of the air passing through the choke 22 , and direction of the air introduced from the air inlet 11 a of the top case 11 .
- the flow of air introduced from the air inlet 11 a of the top case 11 , flow of air from the choke 22 , and flow of air from the choke 21 are made to join each other and are introduced into the impeller 20 . Accordingly, it is possible to further suppress movement of the impeller 20 in the thrust direction.
- the air blower 10 includes the top case 11 and inner case 12 provided inside the top case 11 , further, motor 17 and impeller 20 are arranged inside the inner case 12 and, between the inner case 12 and motor 17 and between the top case 11 and inner case 12 , the flow channels CH1, CH2, and CH3 are respectively formed. Accordingly, air leaking from the inner case 12 into the top case 11 is guided to the air inlet 20 a of the impeller 20 from the part between the air inlet 11 a of the top case 11 and air inlet 12 a of the inner case 12 through the flow channels CH1, CH2, and CH3, and choke 22 each provided between the top case 11 and inner case 12 . Accordingly, it is possible to suppress movement of the impeller 20 in the thrust direction and prevent the impeller 20 from coming into contact with the inner case 12 .
- the air blower 10 has a double structure constituted of the top case 11 and inner case 12 . Accordingly, the flow of air created by the rotation of the impeller 20 is discharged from the air outlet 11 b of the top case 11 , and it is possible to prevent air from leaking out of the other portions of the top case 11 .
- the inner case 12 includes a ring-shaped concave portion 12 c around the air inlet 12 a
- impeller 20 includes, around the air inlet 20 a thereof, the ring-shaped protruding portion 20 f to be arranged inside the concave portion 12 c
- ring-shaped choke 21 is formed around the air inlet 11 a and air inlet 12 a by the concave portion 12 c and protruding portion 20 f .
- the direction of air introduced from the choke 21 into the air inlet 20 a of the impeller 20 is made parallel to the direction of the air passing through the choke 22 between the top case 11 and inner case 12 and direction of the air introduced from the air inlet 11 a of the top case 11 . Accordingly, the flow of air introduced from the air inlet 11 a of the top case 11 , flow of air from the choke 22 , and flow of air from the choke 21 are made to join each other and are introduced into the impeller 20 . Accordingly, it is possible to further suppress movement of the impeller 20 in the thrust direction, and prevent the impeller 20 from coming into contact with the inner case 12 .
- the direction of the choke 21 is parallel to the choke 22 , inner circumferential surface of the air inlet 11 a , and inner circumferential surface of the air inlet 12 a . Accordingly, even if the impeller 20 is moved in the thrust direction, the width of the gap between the concave portion 12 c and protruding portion 20 f each constituting the choke 21 is never changed in the direction intersecting the rotational axis. Accordingly, when the rotational speed of the impeller 20 is constant, it is possible to maintain the quantity of air (flow rate of air) to be introduced from the choke 21 into the air inlet 20 a constant, stably suppress movement of the impeller 20 in the thrust direction, and facilitate management of the dimension of the choke 21 .
- the choke 22 is formed by arranging the air inlet 12 a of the second inner case 12 - 2 concentric with the air inlet 11 a of the top case 11 . Accordingly, regarding the choke 22 , as in the case of the choke 21 , even when the second inner case 12 - 2 (inner case 12 ) is arranged out of alignment in the thrust direction relatively to the top case 11 , the width of the choke 22 is never changed in the direction intersecting the rotational axis. Accordingly, it is possible to facilitate management of the dimension of the choke 22 .
- the direction of the air introduced from each of the choke 21 and choke 22 into the air inlet 20 a of the impeller 20 is made parallel to the direction of the air introduced from the air inlet 11 a of the top case 11 . Accordingly, the loss in the flow rate is smaller in comparison with the case where the choke 21 and choke 22 are arranged in the direction (radial direction) perpendicular to the air inlet 11 a of the top case 11 and, furthermore, it is possible to reduce the noise.
- the air introduced from the air inlet 11 a of the top case 11 into the air inlet 20 a of the impeller 20 gradually changes the direction thereof at a right angle toward the air outlets 20 b . Therefore, the flow of air from the choke 22 closer to the air inlet 20 a than the choke 21 joins the flow of air introduced from the air inlet 20 a more smoothly as compared with the flow of air from the choke 21 , and thus the loss in the flow rate and noise are reduced.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An air blower capable of suppressing movement of an impeller in a thrust direction is provided. A first case includes a first air inlet and a first air outlet. A second case includes a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet. An impeller is provided inside the second case. A motor rotates the impeller. A first flow channel is provided between the motor and the second case on the opposite side of the first air inlet and the second air inlet relatively to the impeller. A second flow channel is provided between the first case and the second case and communicates with the first flow channel, the first air inlet, and the second air inlet.
Description
- This application is a continuation of International Application No. PCT/JP2021/005253, filed on Feb. 12, 2021, which claims priority to and the benefit of Japanese Patent Application No. 2020-054420, filed on Mar. 25, 2020 and Japanese Patent Application No. 2020-054421, filed on Mar. 25, 2020. The disclosures of the above applications are incorporated herein by reference.
- The present disclosure relates to an air blower using, for example, a centrifugal fan.
- An air blower using, for example, a centrifugal fan comprises an impeller, motor configured to rotate the impeller, air inlet provided in the rotational axis direction of the impeller, and air outlet arranged in a direction perpendicular to the air inlet. When the impeller is rotated by the motor, a pressure difference is created between the top surface side (air inlet side) and undersurface side relative to the rotational axis direction of the impeller, whereby the motor shaft and impeller are moved in the thrust direction (rotational axis direction) and impeller is brought into contact with the housing of the air blower.
- A technique of eliminating a pressure difference between the top surface and undersurface of the impeller by providing a pressure chamber and valve chamber adjacent to the pressure chamber on each of the top surface and undersurface of the impeller is developed (see, for example, Patent Literature 1 (JP 2006-129638 A)).
- Further, there is a technique of equalizing the pressures at the top surface and undersurface of the impeller by providing a plurality of ring-shaped blade retainer plates on each of the top surface and undersurface of the impeller and discharging the air sucked from the air inlet from the air outlet (see, for example, Patent Literature 2 (JP 4716750 B)).
- An embodiment described herein aims to provide an air blower capable of suppressing movement of an impeller thereof in the thrust direction.
- An air blower of this embodiment includes a first case including a first air inlet and a first air outlet, a second case provided inside the first case and including a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet, an impeller being provided inside the second case, a rotational axis of which is made coincident with a central axis of each of the first air inlet and the second air inlet, and serving as a centrifugal fan, a motor being provided inside the second case and to rotate the impeller, a first flow channel provided between the motor and the second case on the opposite side of the first air inlet of the impeller and the second air inlet, and a second flow channel provided between the first case and the second case and communicating with the first flow channel, the first air inlet, and the second air inlet.
- Additional objects and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the disclosure. The objects and advantages of the disclosure may be realized and obtained by means of the instrumentalities and combinations particularly pointed out hereinafter.
- The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
-
FIG. 1 is a top view showing an air blower according to an embodiment of the present disclosure. -
FIG. 2 is a cross-sectional view along line II-II ofFIG. 1 . -
FIG. 3 is a perspective exploded view showing a part ofFIG. 1 . -
FIG. 4 is a perspective view showing another part ofFIG. 1 . -
FIG. 5 is a view showing a function ofFIG. 1 and is a cross-sectional view along line V-V ofFIG. 1 . -
FIG. 6 is a cross-sectional view showing a part A ofFIG. 5 in an enlarged form. - Embodiments of the present disclosure will be described below with reference to the accompanying drawings. In the drawings, parts identical to each other are denoted by identical reference symbols.
-
FIG. 1 shows anair blower 10 according to this embodiment. Theair blower 10 comprises atop case 11 serving as a housing, andtop case 11 has an approximately cylindrical shape and includes an air inlet (first air inlet) 11 a and air outlet (first air outlet) 11 b. Theair inlet 11 a is arranged on a top surface of thetop case 11 and at a central part thereof, andair outlet 11 b is arranged on a side surface of thetop case 11 and in a direction approximately perpendicular to theair inlet 11 a. - As shown in
FIG. 2 , inside thetop case 11, aninner case 12 is provided. Theinner case 12 is divided into a first inner case 12-1 on the lower side and second inner case 12-2 on the upper side. However, theinner case 12 is not necessarily divided, and may be integrally configured. Theinner case 12 includes an air inlet (second air inlet) 12 a communicating with theair inlet 11 a of thetop case 11 and air outlet (second air outlet) 12 b communicating with theair outlet 11 b of thetop case 11. - The inner diameter of the
air inlet 12 a of theinner case 12 is greater than the inner diameter of theair inlet 11 a of thetop case 11, andair inlet 11 a is arranged inside theair inlet 12 a. Accordingly, theair inlet 11 a andair inlet 12 a are arranged concentric with each other. - Furthermore, between the
inner case 12 andtop case 11, a flow channel (first flow channel) (CH3) to be described later is provided. That is, a part of theinner case 12 is separate from an inner surface of thetop case 11 and the flow channel (CH3) is formed at this part. - To a lower part of each of the
top case 11 andinner case 12, abase 13 is attached by a plurality ofscrews 14. Between the lower part of each of thetop case 11 andinner case 12 andbase 13, abase plate 15 is provided. Thebase plate 15 is fixed to thebase 13 by a plurality ofscrews 16. - Between a circumference of the
base plate 15 andtop case 11, a ring-shapedgasket 18 serving as a sealing member is provided and, also between the circumference of thebase plate 15 andbase 13, a ring-shapedgasket 19 serving as a sealing member is provided. Thegaskets top case 11 andbase plate 15 is blocked by thegasket 18 and, gap between the base 13 andbase plate 15 is blocked by thegasket 19. Accordingly, thetop case 11 andbase 13 are sealed up and air is prevented from leaking out of thetop case 11 andbase 13. - As shown in
FIG. 2 andFIG. 3 , an openingportion 15 a is provided at a central part of thebase plate 15 and astator 17 a of a motor 17 is arranged inside the openingportion 15 a. Thestator 17 a is cylindrical and is accommodated in aconcave portion 13 a provided at a central part of thebase 13. - An inner diameter of the opening
portion 15 a of thebase plate 15 is equal to or slightly greater than an outer diameter of thestator 17 a and a plurality ofconcave portions 15 b is provided in an inner circumference of the openingportion 15 a. Accordingly, a plurality of gaps is formed between thebase plate 15 andstator 17 a by the plurality ofconcave portions 15 b. - Furthermore, a plurality of opening
portions 15 c is provided in a circumferential part of thebase plate 15. These openingportions 15 c are positioned outside theinner case 12 and inside thetop case 11 and are arranged in a one-to-one correspondence with a plurality ofconcave portions 13 b provided on thebase 13. - The
concave portions 13 b of thebase 13,concave portions 15 b of thebase plate 15, and openingportions 15 c constitute a flow channel (CH2) communicating with the aforementioned flow channel (CH3) between theinner case 12 andtop case 11. - The motor 17 is arranged inside the
inner case 12, more specifically, the motor 17 is arranged inside the first inner case 12-1. The motor 17 includes theaforementioned stator 17 a,sleeve 17 b, shaft 17 c, bearing 17 d, a plurality of coils 17 e, a plurality of yokes 17 f,rotor holder 17 g,permanent magnet 17 h, and shaft holder 17 i. - The
sleeve 17 b is provided inside thestator 17 a and shaft 17 c is arranged inside thesleeve 17 b. The fixed portion of thebearing 17 d is fixed to the inside of thesleeve 17 b and rotating portion of thebearing 17 d is fixed to a first end of the shaft 17 c. The shaft 17 c retained by the bearing 17 d inside the sleeve 17 and is retained in the thrust direction by the magnetic force. Thesleeve 17 b and shaft 17 c may constitute an aerodynamic pressure bearing. The plurality of yokes 17 f around which the plurality of coils 17 e is each wound are arranged around thestator 17 a. The shaft holder 17 i is fixed to a second end of the shaft 17 c, androtor holder 17 g is retained inside the shaft holder 17 i. Thepermanent magnet 17 h is cylindrical and is fixed to the inside of therotor holder 17 g. An inner surface of thepermanent magnet 17 h is arranged separate from the plurality of yokes 17 f. - An outer surface of the shaft holder 17 i is separated from an inner surface of the first inner case 12-1, and a gap formed between the outer surface of the shaft holder 17 i and first inner case 12-1 constitute a flow channel (CH1).
- It should be noted that the configuration of the motor 17 is not limited to the above and can be modified.
- An
impeller 20 is arranged inside the second inner case 12-2 and is attached to an upper part of the shaft holder 17 i. - As shown in
FIG. 4 , theimpeller 20 is a centrifugal fan and is, for example, a so-called turbofan. However, theimpeller 20 is not limited to the turbofan. - The
impeller 20 comprises an air inlet (third air inlet) 20 a, a plurality of air outlets (third air outlets) 20 b, and plurality ofblades 20 c. Theair inlet 20 a is provided at a central part of the top surface (first surface) 20 d of theimpeller 20, and plurality of air outlets is arranged along the outer circumference of theimpeller 20. The plurality ofblades 20 is arranged between thetop surface 20 d of theimpeller 20 and undersurface (second surface) 20 e thereof and between theair inlet 20 a and plurality ofair outlets 20 b. - Furthermore, on the
top surface 20 d of theimpeller 20 and around theair inlet 20 a, a ring-shaped protrudingportion 20 f is provided. - As shown in
FIG. 2 , in theimpeller 20, in a state where theimpeller 20 is arranged inside the second inner case 12-2, theair inlet 20 a thereof is opposed to theair inlet 11 a of thetop case 11 andair inlet 12 a of theinner case 12. Each of thetop surface 20 d of theimpeller 20,undersurface 20 e thereof, and side surface thereof in which theair outlets 20 b are provided is separated from the inner surface of the second inner case 12-2 and a gap is formed therebetween. - Further, on the inner surface of the second inner case 12-2 and around the
air inlet 12 a, a ring-shapedconcave portion 12 c is provided, and protrudingportion 20 f of theimpeller 20 is arranged inside theconcave portion 12 c. In a state where the protrudingportion 20 f is arranged inside theconcave portion 12 c, between the protrudingportion 20 f andconcave portion 12 c, a gap communicating with the gap provided between thetop surface 20 d of theimpeller 20 and inner surface of the second inner case 12-2 is formed. This gap constitutes a flow channel (second flow channel) (CH4). The gap formed by theconcave portion 12 c and protrudingportion 20 f is made to communicate with theair inlet 11 a of thetop case 11 andair inlet 12 a of theinner case 12. - More specifically, the inner surface of the
air inlet 11 a of thetop case 11, inner surface of theair inlet 12 a of theinner case 12, and ring-shaped gap between the protrudingportion 20 f of theimpeller 20 andconcave portion 12 c of the second inner case 12-2 are parallel to each other. Accordingly, the direction of air flowing out of the ring-shaped flow channel is parallel to the direction of air flowing into each of theair inlet 11 a of thetop case 11 andair inlet 12 a of the second inner case 12-2. - Further, the gap between the
top surface 20 d of theimpeller 20 and second inner case 12-2 is greater than the ring-shaped gap (gap in the radial direction (direction perpendicular to the rotational axis)) between the protrudingportion 20 f of theimpeller 20 andconcave portion 12 c of the second inner case 12-2, and functions as a valve chamber configured to control the flow of air. Between the undersurface 20 e of theimpeller 20 and second inner case 12-2 too, a gap (a part of the flow channel CH3) similar to that on thetop surface 20 d side of theimpeller 20 is provided, and the pressure on thetop surface 20 d of theimpeller 20 and pressure on the undersurface 20 e thereof are equally maintained by the gap on thetop surface 20 d side of theimpeller 20 and gap on the undersurface 20 e side thereof. Accordingly, movement of theimpeller 20 in the thrust direction is suppressed. - The ring-shaped gap between the protruding
portion 20 f of theimpeller 20 andconcave portion 12 c of the second inner case 12-2 is less than the gap between thetop surface 20 d of theimpeller 20 and second inner case 12-2 and functions as a choke (second choke) 21 configured to narrow the flow of air. - Further, the ring-shaped gap between the inner surface of the
air inlet 12 a of the second inner case 12-2 and outer surface of theair inlet 11 a of thetop case 11 is less than the gap between the undersurface 20 e of theimpeller 20 and second inner case 12-2 or gap between thetop case 11 andinner case 12 and functions as a choke (first choke) 22 configured to narrow the flow of air. - In this embodiment, the ring-shaped
choke 21 is arranged outside theair inlet 11 a andair inlet 12 a and direction of the flow of air flowing out of thechoke 21 is parallel to the direction of the flow of air sucked from theair inlet 11 a andair inlet 12 a. In other words, thechoke 21 is arranged in parallel with the inner surface of theair inlet 11 a of thetop case 11 and inner surface of theair inlet 12 a of theinner case 12. - The ring-shaped
choke 22 is arranged between theair inlet 11 a andair inlet 12 a and direction of the flow of air flowing out of thechoke 22 is parallel to the direction of the flow of air flowing out of theair inlet 11 a,air inlet 12 a, and choke 21. That is, thechoke 22 is arranged in parallel with thechoke 21. - (Function)
- The function of the
aforementioned air blower 10 will be described below with reference toFIG. 5 andFIG. 6 . - When the motor 17 is driven and
impeller 20 is rotated, air introduced from each of theair inlet 11 a of thetop case 11 andair inlet 12 a of theinner case 12 is guided to theair inlet 20 a of theimpeller 20 and is discharged from theair outlets 20 b of theimpeller 20,air outlet 12 b of theinner case 12, andair outlet 11 b of thetop case 11. - On the other hand, part of the air inside the
inner case 12 is introduced into theair inlet 20 a of theimpeller 20 from the part between theair inlet 11 a of thetop case 11 andair inlet 12 a of theinner case 12 through the flow channel CH1 between the motor 17 and inner case 12 (first inner case 12-1), flow channel CH2 extending through the openingportion 15 a andconcave portions 15 b of thebase plate 15,concave portions 13 b of thebase 13, and openingportions 15 c of thebase plate 15, flow channel CH3 between thetop case 11 andinner case 12, and choke 22. - As described above, the air on the lower side of the
impeller 20 is guided to the upper side (upper side of the impeller 20) of theinner case 12 through the flow channels CH1, CH2, and CH3 and choke 22 and is introduced into theair inlet 20 a of theimpeller 20 together with the air introduced from theair inlet 11 a of thetop case 11. Accordingly, it is possible to suppress movement of theimpeller 20 in the thrust direction. - Furthermore, part of the air inside the
inner case 12 is introduced into theair inlet 20 a of theimpeller 20 through the flow channel CH4 between the top surface (first surface) 20 d of theimpeller 20 and inner case 12 (second inner case 12-2) and choke 21 together with the air passing through the flow channel CH3 and choke 22 and air introduced from theair inlet 11 a of thetop case 11. Moreover, the direction of the air introduced from thechoke 21 into theair inlet 20 a of theimpeller 20 is made parallel to the direction of the air passing through thechoke 22, and direction of the air introduced from theair inlet 11 a of thetop case 11. Accordingly, the flow of air introduced from theair inlet 11 a of thetop case 11, flow of air from thechoke 22, and flow of air from thechoke 21 are made to join each other and are introduced into theimpeller 20. Accordingly, it is possible to further suppress movement of theimpeller 20 in the thrust direction. - According to the embodiment described above, the
air blower 10 includes thetop case 11 andinner case 12 provided inside thetop case 11, further, motor 17 andimpeller 20 are arranged inside theinner case 12 and, between theinner case 12 and motor 17 and between thetop case 11 andinner case 12, the flow channels CH1, CH2, and CH3 are respectively formed. Accordingly, air leaking from theinner case 12 into thetop case 11 is guided to theair inlet 20 a of theimpeller 20 from the part between theair inlet 11 a of thetop case 11 andair inlet 12 a of theinner case 12 through the flow channels CH1, CH2, and CH3, and choke 22 each provided between thetop case 11 andinner case 12. Accordingly, it is possible to suppress movement of theimpeller 20 in the thrust direction and prevent theimpeller 20 from coming into contact with theinner case 12. - Moreover, the
air blower 10 has a double structure constituted of thetop case 11 andinner case 12. Accordingly, the flow of air created by the rotation of theimpeller 20 is discharged from theair outlet 11 b of thetop case 11, and it is possible to prevent air from leaking out of the other portions of thetop case 11. - Further, according to the embodiment described above, the
inner case 12 includes a ring-shapedconcave portion 12 c around theair inlet 12 a,impeller 20 includes, around theair inlet 20 a thereof, the ring-shaped protrudingportion 20 f to be arranged inside theconcave portion 12 c, and ring-shapedchoke 21 is formed around theair inlet 11 a andair inlet 12 a by theconcave portion 12 c and protrudingportion 20 f. Moreover, the direction of air introduced from thechoke 21 into theair inlet 20 a of theimpeller 20 is made parallel to the direction of the air passing through thechoke 22 between thetop case 11 andinner case 12 and direction of the air introduced from theair inlet 11 a of thetop case 11. Accordingly, the flow of air introduced from theair inlet 11 a of thetop case 11, flow of air from thechoke 22, and flow of air from thechoke 21 are made to join each other and are introduced into theimpeller 20. Accordingly, it is possible to further suppress movement of theimpeller 20 in the thrust direction, and prevent theimpeller 20 from coming into contact with theinner case 12. - Furthermore, the direction of the
choke 21 is parallel to thechoke 22, inner circumferential surface of theair inlet 11 a, and inner circumferential surface of theair inlet 12 a. Accordingly, even if theimpeller 20 is moved in the thrust direction, the width of the gap between theconcave portion 12 c and protrudingportion 20 f each constituting thechoke 21 is never changed in the direction intersecting the rotational axis. Accordingly, when the rotational speed of theimpeller 20 is constant, it is possible to maintain the quantity of air (flow rate of air) to be introduced from thechoke 21 into theair inlet 20 a constant, stably suppress movement of theimpeller 20 in the thrust direction, and facilitate management of the dimension of thechoke 21. - The
choke 22 is formed by arranging theair inlet 12 a of the second inner case 12-2 concentric with theair inlet 11 a of thetop case 11. Accordingly, regarding thechoke 22, as in the case of thechoke 21, even when the second inner case 12-2 (inner case 12) is arranged out of alignment in the thrust direction relatively to thetop case 11, the width of thechoke 22 is never changed in the direction intersecting the rotational axis. Accordingly, it is possible to facilitate management of the dimension of thechoke 22. - Further, the direction of the air introduced from each of the
choke 21 and choke 22 into theair inlet 20 a of theimpeller 20 is made parallel to the direction of the air introduced from theair inlet 11 a of thetop case 11. Accordingly, the loss in the flow rate is smaller in comparison with the case where thechoke 21 and choke 22 are arranged in the direction (radial direction) perpendicular to theair inlet 11 a of thetop case 11 and, furthermore, it is possible to reduce the noise. - More specifically, the air introduced from the
air inlet 11 a of thetop case 11 into theair inlet 20 a of theimpeller 20 gradually changes the direction thereof at a right angle toward theair outlets 20 b. Therefore, the flow of air from thechoke 22 closer to theair inlet 20 a than thechoke 21 joins the flow of air introduced from theair inlet 20 a more smoothly as compared with the flow of air from thechoke 21, and thus the loss in the flow rate and noise are reduced. - Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the disclosure in its broader aspects is not limited to the specific details and representative embodiments shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Claims (8)
1. An air blower comprising:
a first case including a first air inlet and a first air outlet;
a second case provided inside the first case and including a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet;
an impeller being provided inside the second case, a rotational axis of which is made coincident with a central axis of each of the first air inlet and the second air inlet, and serving as a centrifugal fan;
a motor being provided inside the second case and to rotate the impeller;
a first flow channel provided between the motor and the second case on the opposite side of the first air inlet of the impeller and the second air inlet; and
a second flow channel provided between the first case and the second case and communicating with the first flow channel, the first air inlet, and the second air inlet.
2. The air blower of claim 1 , wherein
the first air inlet of the first case includes a first side surface parallel to the central axis, and the second air inlet of the second case includes a second side surface parallel to the first side surface.
3. The air blower of claim 2 , further comprising a second flow channel provided between a first surface of the impeller on the first and second air inlets side and a second surface of the second case opposed to the first surface, and between the second air inlet of the second case and a surface of the impeller opposed to the second air inlet, and communicating with the first air inlet and the second air inlet.
4. The air blower of claim 3 , further comprising:
a base configured to cover a bottom portion of the first case; and
a ring-shaped sealing member provided between the first case and the base.
5. An air blower comprising:
a first case including a first air inlet and a first air outlet;
a second case provided inside the first case and including a second air inlet communicating with the first air inlet and a second air outlet communicating with the first air outlet;
an impeller being provided inside the second case, a rotational axis of which is made coincident with a central axis of each of the first air inlet and the second air inlet, and serving as a centrifugal fan; and
a motor being provided inside the second case and configured to rotate the impeller, wherein
the first air inlet and the second air inlet are arranged concentric with each other, and two side surfaces between the first air inlet and the second air inlet are parallel to the rotational axis and each form a first flow channel which guides air between the first case and the second case to the first air inlet and the second air inlet.
6. The air blower of claim 5 , wherein
the second case includes a ring-shaped concave portion provided around the second air inlet and in a surface thereof opposed to the impeller,
the impeller includes a ring-shaped protruding portion on the first surface thereof on the first and second air inlets side, the ring-shaped protruding portion being arranged inside the concave portion, and
two side surfaces between the concave portion and the protruding portion and parallel to the rotational axis each constitute a second flow channel which guides air on the surface corresponding to the first air inlet and the second air inlet of the impeller to the first air outlet and the second air outlet.
7. The air blower of claim 6 , wherein
a gap of the first flow channel in a direction intersecting the rotational axis at right angles is less than a gap between the first case and the second case, and forms a first choke.
8. The air blower of claim 7 , wherein
a gap of the second flow channel in a direction intersecting the rotational axis at right angles is less than a gap between the surface of the impeller corresponding to the first air inlet and the second air inlet and the second case, and forms a second choke.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2020054420A JP7341935B2 (en) | 2020-03-25 | 2020-03-25 | Blower |
JP2020-054421 | 2020-03-25 | ||
JP2020054421A JP7341936B2 (en) | 2020-03-25 | 2020-03-25 | Blower |
JP2020-054420 | 2020-03-25 | ||
PCT/JP2021/005253 WO2021192708A1 (en) | 2020-03-25 | 2021-02-12 | Blower |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2021/005253 Continuation WO2021192708A1 (en) | 2020-03-25 | 2021-02-12 | Blower |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230016055A1 true US20230016055A1 (en) | 2023-01-19 |
Family
ID=77891160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/951,347 Abandoned US20230016055A1 (en) | 2020-03-25 | 2022-09-23 | Air blower |
Country Status (3)
Country | Link |
---|---|
US (1) | US20230016055A1 (en) |
CN (1) | CN115349059A (en) |
WO (1) | WO2021192708A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5857348A (en) * | 1993-06-15 | 1999-01-12 | Multistack International Limited | Compressor |
US20190345956A1 (en) * | 2017-01-25 | 2019-11-14 | Ihi Corporation | Electric compressor |
US20210180610A1 (en) * | 2018-10-10 | 2021-06-17 | HELLA GmbH & Co. KGaA | Pump, in particular for a liquid circuit in a vehicle |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5395410U (en) * | 1977-01-05 | 1978-08-03 | ||
JPS53150907U (en) * | 1977-05-06 | 1978-11-28 | ||
US7775763B1 (en) * | 2007-06-21 | 2010-08-17 | Florida Turbine Technologies, Inc. | Centrifugal pump with rotor thrust balancing seal |
JP2015028341A (en) * | 2014-08-19 | 2015-02-12 | 三菱電機株式会社 | Motor-driven centrifugal blower, and vacuum cleaner using the same |
-
2021
- 2021-02-12 CN CN202180023946.8A patent/CN115349059A/en active Pending
- 2021-02-12 WO PCT/JP2021/005253 patent/WO2021192708A1/en active Application Filing
-
2022
- 2022-09-23 US US17/951,347 patent/US20230016055A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5857348A (en) * | 1993-06-15 | 1999-01-12 | Multistack International Limited | Compressor |
US20190345956A1 (en) * | 2017-01-25 | 2019-11-14 | Ihi Corporation | Electric compressor |
US20210180610A1 (en) * | 2018-10-10 | 2021-06-17 | HELLA GmbH & Co. KGaA | Pump, in particular for a liquid circuit in a vehicle |
Also Published As
Publication number | Publication date |
---|---|
CN115349059A (en) | 2022-11-15 |
WO2021192708A1 (en) | 2021-09-30 |
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