CN109958633A

CN109958633A - Multiple-blade centrifugal blower

Info

Publication number: CN109958633A
Application number: CN201810938653.2A
Authority: CN
Inventors: 重田明广
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2017-12-26
Filing date: 2018-08-17
Publication date: 2019-07-02
Anticipated expiration: 2038-08-17
Also published as: JP6844526B2; JP2019113037A; EP3505769B1; ES2871900T3; EP3505769A1; CN109958633B

Abstract

The present invention provides a kind of multiple-blade centrifugal blower, the recycle stream (W ') that its a part for being able to suppress the air-flow (W) blown out from impeller (1) to centrifugal direction is formed by the gap of horn mouth (8) and retaining ring (6) by intake impeller again (1), along retaining ring (6) from air-flow separation when again flowing between blade (5), the noise separated due to the air-flow is reduced.In the multiple-blade centrifugal blower for including impeller (1) and the volute type casing (2) configured in a manner of surrounding impeller (1), the retaining ring (6) of impeller (1) includes: the 1st end face (6a) of retaining ring of most end substantially vertical with the central axis of impeller (1) and as impeller (1)；Holding ring inner surface (6c) that is substantially parallel with the central axis of impeller (1) and being connect with blade (5)；And it is formed in the 1st end face (6a) of retaining ring and keeps the joint face (6e) between ring inner surface (6c).

Description

Multiple-blade centrifugal blower

Technical field

The present invention relates to a kind of multiblade fans as example for the multiple-blade centrifugal blower in air conditioner etc..

Background technique

Existing this multiple-blade centrifugal blower is as shown in Fig. 8, Fig. 9, Figure 10, Figure 11, by volute type casing 101 and impeller 102 It constitutes (referring for example to patent document 1).

Fig. 8 is the perspective view for the existing multiple-blade centrifugal blower recorded in above-mentioned bulletin.

In addition, Fig. 9 is the height side of the central axis and air blow-off outlet by the impeller of existing multiple-blade centrifugal blower The sectional view (X-X ' sectional view of Fig. 8 kind) of the plane at upward substantial middle position.

Figure 10 is the perspective view of the impeller of existing multiple-blade centrifugal blower.

Figure 11 is the partial cross-sectional view in Y-Y ' section of the impeller of existing multiple-blade centrifugal blower in Figure 10.

As shown in Figure 8, Figure 9, it is made of volute type casing 101 and multiple-blade centrifugal impeller 102, wherein volute type casing includes: air Blow-off outlet 103, as the horn mouth 104 of air suction inlet, the air flow circuit 105 of vortex shape and connection air blow-off outlet 103 The tongue 106 of the substantially circular shape of lower part and air flow circuit 105, impeller 102 by volute type casing 101 from bearing 107 Integral mainboard 108, which rises, circlewise constitutes the configuration of multiple blades 109, and will be opposite with horn mouth 104 from being formed in The air that the suction inlet 110 of rotary axis direction one end sucks is blown out between blade 109 to centrifugal direction.In 102 periphery of impeller Axial end portion be provided with the retaining ring 111 for keeping blade 109, and in the volute type casing 101 opposite with retaining ring 111 The tongue 106 on surface is nearby provided with the recess portion 112 wider than retaining ring 111, thus it enables that volute type casing 101 and impeller 102 Gap size is more closer (smaller) than the prior art, and can reduce and noise when existing identical air quantity and consumption electric power.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2013-50031 bulletin

Summary of the invention

Subject to be solved by the invention

As shown in figure 9, in general, in the multiple-blade centrifugal blower with volute type casing, generating the sky blown out from impeller A part of gas W flows again into the recycle stream W ' of impeller by bell-mouthed inside from suction inlet.

But there is a problem of in above-mentioned existing structure it is following, as shown in figure 11, in the partial cross section of retaining ring 111 In figure, when flowing through recycle stream W ' near retaining ring 111 and returning between blade 109, with the central axis Z of impeller 102 substantially Vertical and the 1st end face 111a of retaining ring of the most end as impeller 102 and it is substantially parallel with the central axis Z of impeller 102 and with The separation of air-flow, noise occur for the interconnecting piece 111c that the holding ring inner surface 111b that blade 109 connects is connected substantially at right anglesly Increase.

The method used for solving the problem

It is described existing in order to solve the problems, such as, it is including the leafy of impeller and the volute type casing that is configured in a manner of surrounding impeller In piece centrifugal blower, the retaining ring of impeller includes: the position near end that is substantially vertical with the central axis of impeller and being located at impeller The 1st end face of retaining ring set；Holding ring inner surface that is substantially parallel with the central axis of impeller and being connect with blade；It is protected with being formed in Joint face between the 1st end face of support ring and holding ring inner surface.

Even if as a result, in the connection of the interconnecting piece or joint face of the 1st end face of retaining ring and joint face and holding ring inner surface The separation of air-flow occurs for portion, also will form the gas for being attached to joint face again or keeping ring inner surface and flowing along wall surface Stream.

Therefore, the interconnecting piece of the 1st end face of retaining ring and joint face, with joint face with keep ring inner surface interconnecting piece at blunt Angle connection, so reducing the separation of air-flow compared with the interconnecting piece of connection at a generally normal angle.

Invention effect

Multiple-blade centrifugal blower of the invention, a part being able to suppress in the air-flow blown out from impeller to centrifugal direction are led to It crosses the gap of horn mouth and retaining ring and is again sucked into the recycle stream of impeller along retaining ring from when again flowing between blade, It is separated in joint face with the air-flow for keeping the interconnecting piece of ring inner surface to occur, reduces the noise separated due to the air-flow.

Detailed description of the invention

Fig. 1 is the perspective view of the multiple-blade centrifugal blower of the 1st embodiment of the invention.

Fig. 2 is the A-A ' sectional view of the multiple-blade centrifugal blower of the 1st embodiment of the invention.

Fig. 3 is the B-B ' sectional view of the multiple-blade centrifugal blower of the 1st embodiment of the invention.

Fig. 4 is the perspective view of the impeller of the multiple-blade centrifugal blower of the 1st embodiment of the invention.

Fig. 5 is the partial cross-sectional view in the section C-C ' of the impeller of the 1st embodiment of the invention.

Fig. 6 is the partial cross-sectional view that the arc joint face of the 1st embodiment of the invention obtains the section C-C ' of retaining ring.

Fig. 7 is the amplification stereogram of the blade of the 1st embodiment of the invention.

Fig. 8 is the perspective view of existing multiple-blade centrifugal blower.

Fig. 9 is the X-X ' sectional view of existing multiple-blade centrifugal blower

Figure 11 is the partial cross-sectional view in the section Y-Y ' of the impeller of existing multiple-blade centrifugal blower.

Description of symbols

1 impeller

2 volute type casings

3 mainboards

5 blades

5a blade extension

6 retaining rings

The 1st end face of 6a retaining ring

The 2nd end face of 6b retaining ring

6c keeps ring inner surface

6d keeps ring outer surface

6e joint face

6h arc joint face

7 air blow-off outlets

8 horn mouths (air suction inlet)

Specific embodiment

The multiple-blade centrifugal blower of 1st invention includes: impeller comprising mainboard, the central axis spoke relative to above-mentioned mainboard It is configured at multiple blades of the periphery of above-mentioned mainboard with penetrating shape and in above-mentioned blade opposite with the bonding part of above-mentioned mainboard one The retaining ring of the periphery of the fixed above-mentioned multiple blades in side；With with air blow-off outlet and as air suction inlet it is bell-mouthed, The volute type casing configured in a manner of surrounding above-mentioned impeller, wherein above-mentioned retaining ring includes at least: big with the central axis of above-mentioned impeller Cause the 1st end face of retaining ring of the position near end that is vertical and being located at above-mentioned impeller；It substantially hangs down with the central axis of above-mentioned impeller Straight and the 2nd end face of retaining ring as the position opposite with above-mentioned the 1st end face of retaining ring；It is substantially flat with the central axis of above-mentioned impeller Row and the holding ring inner surface being connect with above-mentioned blade；It is substantially parallel with the central axis of above-mentioned impeller and as above-mentioned impeller most The holding ring outer surface of periphery；And the joint face being formed between above-mentioned the 1st end face of retaining ring and above-mentioned holding ring inner surface.

Thereby, it is possible to inhibit a part in the air-flow blown out from impeller to centrifugal direction to pass through horn mouth and retaining ring Gap and be again sucked into impeller and the recycle stream that is formed along retaining ring from when being again flowed between blade, in joint face and protect The air-flow of the interconnecting piece of support ring inner surface separates, and reduces the noise separated due to the air-flow.

2nd invention is, above-mentioned joint face by above-mentioned retaining ring on the central axis direction of above-mentioned impeller in any position It sets in sectional view obtained by truncation and is formed as arc.As a result, compared with the interconnecting piece of polygon, reduce the 1st end face of retaining ring with Keep the separation of the air-flow of the interconnecting piece of ring inner surface.

In addition, air velocity is slower in general, the separation of air-flow is bigger.Therefore, even if in horn mouth and retaining ring Between space pressure difference is smaller, in slow-footed situation of recycle stream, be also able to suppress the air-flow point in joint face From.

As a result, in the low low-load operating rotated and recycle stream is slower, also it is able to suppress between blade and again flows into When joint face and keep ring inner surface interconnecting piece air-flow, reduce the noise that separates due to the air-flow.

3rd invention is that above-mentioned blade extends to the position with above-mentioned connection face contact.It as a result, will be along retaining ring A part of air-flow is guided to blade.

Therefore, high in the revolving speed of impeller and the case where flowed into along the air-flow of retaining ring with the angle opposite with blade tip Under, also inhibit the disorder of air-flow caused by the collision to blade.

As a result, in the case where the highest high load operating of the revolving speed of impeller, also it is able to suppress along retaining ring flowing When air-flow is flowed into the angle opposite with the end of blade, the separation of air-flow caused by the collision to blade is reduced due to this The noise of air-flow separation.

Hereinafter, the embodiments of the present invention will be described with reference to the drawings.In addition, the present invention is not limited by the embodiment It is fixed.

(embodiment 1)

Fig. 1 is the perspective view of the multiple-blade centrifugal blower of the 1st embodiment of the invention.In addition, Fig. 2 is of the invention The multiple-blade centrifugal blower of 1st embodiment as any position between the horn mouth of air suction inlet and the mainboard of impeller Longitudinal section in, sectional view (A-A ' sectional view in Fig. 1) that the central side from horn mouth side to impeller is seen.

Fig. 3 is that the central axis of the impeller of the multiple-blade centrifugal blower of the 1st embodiment through the invention and air are blown out Sectional view (B-B ' sectional view in Fig. 2) in the plane at the substantial middle position of the short transverse of mouth.

In FIG. 1 to FIG. 4, multiple-blade centrifugal blower is made of impeller 1 and volute type casing 2.

Impeller 1 includes: mainboard 3；It is configured at the approximate centre of mainboard 3 and forms integrated bearing 4 with mainboard 3；Relative to Multiple blades 5 that the central axis of mainboard 3 is configured in a manner of leaning forward relative to direction of rotation M in the periphery of mainboard 3 radially； With the retaining ring 6 of the periphery of the fixed multiple blades 5 of opposite side in the part that blade 5 is engaged with mainboard 3.The pivot on bearing 4 Axis is fixed with the rotary shaft of fan electromotor (not shown).

Volute type casing 2 includes: air blow-off outlet 7；Horn mouth 8 as air suction inlet；Be configured at the periphery of impeller 1 with The tongue 9 of the circular shape of the smallest position in the gap of the inner circumferential of volute type casing 2.

In Fig. 5, retaining ring 6 includes: the holding of most end substantially vertical with the central axis of impeller 1 and as impeller 1 The 1st end face 6a of ring；It is substantially vertical with the central axis of impeller 1 and as the retaining ring the 2nd with the 1st end face relative position 6a of retaining ring End face 6b；Holding ring inner surface 6c that is substantially parallel with the central axis of impeller 1 and being connect with blade 5；It is big with the central axis of impeller 1 Cause parallel and the most peripheral as impeller 1 holding ring outer surface 6d；Be formed in table in the 1st end face 6a of retaining ring and retaining ring Joint face 6e between the 6c of face, and the 1st interconnecting piece 6f of the interconnecting piece with the 1st end face 6a of retaining ring and joint face 6e；With 2nd interconnecting piece 6g of the interconnecting piece of joint face 6e and holding ring inner surface 6c.

In addition, for joint face 6e, preferably in the line and impeller 1 of connection the 1st interconnecting piece 6f and the 2nd interconnecting piece 6g Angle formed by mandrel Z, and be 20 ° to 70 ° degree for the angle D close to 6 side of retaining ring.

In the following, movement, the effect to multiple-blade centrifugal blower formed as described above are illustrated.Firstly, such as Fig. 2 institute Show, is rotated by impeller 1 to direction of rotation M, the air W between multiple blades 5 is discharged by blade 5 to the periphery of impeller 1, collision To after the inner circumferential of volute type casing 2, flowed to direction identical with direction of rotation M along the inner circumferential of volute type casing 2, from air blow-off outlet 7 are blown out.Then, the air pressure decline of 1 inner circumferential of impeller, because of the pressure difference with atmospheric pressure, air is flowed into leaf from horn mouth 8 Wheel 1.

It is blown by this series of air-flow, especially in the multiple-blade centrifugal blower described in present embodiment, The fireballing air being discharged to the periphery of impeller 1 is gradually expanded and fast in the gap with impeller 1 and volute type casing 2 from tongue 9 It is converted into pressure when degree decline, to take into account high air quantity and high static pressure.

After inner circumferential collision as the air stream W and volute type casing 2 of mainstream, a part is directed to the sky between blade 5 The low part of atmospheric pressure and generate recycle stream W ', at this time as shown in figure 3, between the inner surface and impeller 1 for being formed in horn mouth 8 The flow path of gap is in retaining ring 6 after detour, from flowing again into impeller 1 between blade 5.

In the present embodiment, by forming joint face 6e between the 1st end face 6a of retaining ring and holding ring inner surface 6c, The interconnecting piece 6g of the interconnecting piece 6f and joint face 6e of retaining ring the 1st end face 6a and joint face 6e and holding ring inner surface 6c is at blunt Angle connection, so reducing the air-flow for flowing again into impeller 1 compared with the impeller of the interconnecting piece with connection at a generally normal angle Separation.

Therefore, it can be attached to joint face 6e again along the recycle stream W ' that retaining ring 6 flows and keeps ring inner surface 6c On, swimmingly collaborate with mainstream W.

As described above, in the present embodiment, by being formed between the 1st end face 6a of retaining ring and holding ring inner surface 6c The interconnecting piece 6f and joint face 6e of joint face 6e, the 1st end face 6a of retaining ring and joint face 6e and the connection for keeping ring inner surface 6c Portion 6g is connected at obtuse angle, so compared with the interconnecting piece of connection at a generally normal angle, can reduce the separation of air-flow, reduce due to The isolated noise of the air-flow.

In addition, Fig. 6 is the partial cross section in the section C-C ' of the retaining ring of the arc joint face of the 1st embodiment of the invention Figure.

By using the joint face 6h of arc, the joint face with polygon as shown in Figure 6 for the joint face of present embodiment 6e is compared, and reduces the separation of air-flow.

In addition, air velocity is slower in general, the separation of air-flow is bigger.Therefore, even if in horn mouth 8 and retaining ring The difference of the pressure in the space between 6 is smaller, in the slow-footed situation of recycle stream W ', also inhibits the gas in the joint face 6h of arc The separation of stream.

As a result, in the low low-load operating rotated and recycle stream W ' is slower, also it is able to suppress between blade 5 and flows again The air-flow of the interconnecting piece of the joint face 6h and holding ring inner surface 6c of fashionable arc, reduces making an uproar for the separation due to the air-flow Sound.

In addition, Fig. 7 is the stereo amplification figure of the impeller of the 1st embodiment of the invention.

As shown in fig. 7, in the present embodiment, the joint portion of blade 5 and retaining ring 6 is extended to and arc by being arranged The blade extension 5a of the position of joint face 6h contact, by a part from the 1st end face 6a of retaining ring along arc joint face 6h Air-flow is guided to blade 5.

Therefore, though the rotation speed in impeller 1 it is high and along the air-flow of retaining ring 6 with the angle opposite with the end of blade 5 In the case that degree flows into, also inhibit the disorder of air-flow caused by the collision to blade 5.

Even if being also able to suppress in the case where the highest high load operating of the revolving speed of impeller 1 along retaining ring 6 as a result, When the air-flow of flowing is flowed into the angle opposite with the end of blade 5, the separation of air-flow caused by the collision to blade 5 is reduced Because in the noise of air-flow separation.

Industrial availability

As described above, multiple-blade centrifugal blower of the invention, for inhibiting a part for the air-flow being discharged from impeller periphery From being flowed between blade and the recycle stream that is formed can be suitable for air conditioner, air purifier, dry in the separation of retaining ring The purposes such as dry machine, air conditioner for automobile.

Claims

1. a kind of multiple-blade centrifugal blower characterized by comprising

Impeller comprising mainboard, relative to the mainboard central axis be configured at radially the mainboard periphery it is multiple The holding of the periphery of blade and the fixed the multiple blade of opposite side in the blade Yu the bonding part of the mainboard Ring；With with air blow-off outlet and as bell-mouthed, the volute that is configured in a manner of surrounding the impeller of air suction inlet Shell, wherein

The retaining ring includes at least: the position near end that is substantially vertical with the central axis of the impeller and being located at the impeller The 1st end face of retaining ring set；It is substantially vertical with the central axis of the impeller and as the position opposite with the 1st end face of retaining ring The 2nd end face of retaining ring set；Holding ring inner surface that is substantially parallel with the central axis of the impeller and being connect with the blade；With The central axis of the impeller is substantially parallel and the holding ring outer surface of most peripheral as the impeller；Be formed in the holding The 1st end face of ring and the joint face kept between ring inner surface.

2. multiple-blade centrifugal blower as described in claim 1, it is characterised in that:

Joint face section obtained by the retaining ring is truncated at an arbitrary position on the central axis direction of the impeller Be formed as arc in figure.

3. multiple-blade centrifugal blower as claimed in claim 1 or 2, it is characterised in that:

The blade extends to the position with the connection face contact.