CN107654418A - The centrifugal blower for preventing inner air from flowing back - Google Patents

Abstract

The invention discloses a kind of centrifugal blower for preventing inner air from flowing back, belong to heating installation, existing wind warms up type bathroom heating device and is only capable of to specific direction or local blowing ratio, influence the comfort of people, bathroom is slower by the cold speed to warm, the present invention provides a kind of centrifugal blower for being suitable to 360 ° of air-out and preventing inner air from flowing back, it is by the way that centrifugal wind wheel is placed in cylindrical shell body, and one end closing of cylinder shell, other end mount support component, bracket component is provided with the air inlet for being located at middle part and is looped around the second ring-type air-out passage of air inlet periphery, centrifugal wind wheel has a lower surface, lower surface and the roundabout cooperation of bracket component, to prevent inner air from flowing back, reduce wind loss, improve air output, reduce noise.

Description

The centrifugal blower for preventing inner air from flowing back

Technical field

The invention belongs to heating installation, and in particular to a kind of centrifugal blower for preventing inner air from flowing back.

Background technology

It is all that air is flowed through into rectangle ptc heater to realize heating that wind, which warms up type bathroom heating device, above market, then with fixation Direction or the direction controlling wind direction air-out by adjusting shutter, air-out direction can only keep a direction or in waving shape, Last warm air spreads to bathroom, and the warmer spread again after this warm wind air-out has a disadvantage that：

1. easily making bathroom heating skewness or only keeping local warm wind, the comfort of people is influenceed.

2. heating is slower by the cold speed to warm by bathroom.

3. air outlet against human body blow when, heating easily make one with water evaporation it is too fast, absorb human heat it is very fast, hold Easily cause human body uncomfortable.

The content of the invention

The technical problem to be solved in the present invention and the technical assignment proposed are to overcome existing wind to warm up type bathroom heating device to be only capable of A kind of the defects of to specific direction or local blowing ratio, there is provided centrifugation wind for being suitable to 360 ° of air-out and preventing inner air from flowing back Machine.

To reach above-mentioned purpose, the of the invention centrifugal blower for preventing that inner air from flowing back, including by it is motor-driven from Heart wind wheel, it is characterized in that：Described centrifugal wind wheel is placed in a cylindrical shell body, and one end of the cylinder shell is closed, be another One end mount support component, described bracket component are provided with the air inlet for being located at middle part and are looped around outside the air inlet The the second ring-type air-out passage enclosed, described centrifugal wind wheel have a lower surface, described lower surface and described support group The roundabout cooperation of part.

As optimization technique means：The lower surface is arcuate surface, and the outward flange of the lower surface is higher than inner edges；Institute The bracket component stated has inner concave；The inner concave matches to form described roundabout cooperation with described arcuate surface, described Inner concave and arcuate surface between form roundabout gap.

As optimization technique means：The size in the roundabout gap is 2-8mm.

As optimization technique means：The bracket component has an annular groove, and the inward flange of the lower surface stretches into described Annular groove form described roundabout cooperation.

As optimization technique means：The bracket component includes upper inner support, and described annular groove is located at described upper interior branch On frame.

As optimization technique means：The bracket component includes upper inner support, the mask with the upper inner support assembling, institute State the position that inner support is combined with mask and be collectively forming described annular groove.

As optimization technique means：The bracket component has a raised ring side, and described ring skirt is under described End face forms described roundabout cooperation.

As optimization technique means：Described centrifugal wind wheel is coaxially disposed with cylinder shell.

As optimization technique means：The external port of the second ring-type air-out passage tilts in bell mouth shape to periphery.

The present invention is by the way that centrifugal wind wheel is placed in cylindrical shell body, and one end closing, the other end dress of cylinder shell With bracket component, bracket component is provided with the air inlet for being located at middle part and is looped around the second ring-type air-out of air inlet periphery Passage, centrifugal wind wheel have a lower surface, lower surface and the roundabout cooperation of bracket component, to prevent inner air from flowing back, drop Low wind loss, air output is improved, reduce noise.

Brief description of the drawings

The centrifugal blower that Fig. 1 a are the present invention applies a kind of structural representation on warmer；

Air flow direction schematic diagram during the shown warmer work that Fig. 1 b are Fig. 1 a；

Fig. 2 is the ring-type electric heater assembling structure schematic diagram of warmer embodiment one of the present invention；

Fig. 3 is the structural representation of the upper support arm of warmer embodiment one of the present invention；

Fig. 4 is the structural representation of the upper inner support of warmer embodiment one of the present invention；

Fig. 5 is the structural representation of the lower support arm of warmer embodiment one of the present invention；

Fig. 6 is the structural representation of the lower inner support of warmer embodiment one of the present invention；

Fig. 7 is that the ring-type electric heater of warmer embodiment one of the present invention keeps the schematic diagram in gap with external annulus, internal ring wall；

Fig. 8 is the ring-type electric heater and the schematic diagram of upper inner support assembling of warmer embodiment one of the present invention；

Fig. 9 a are the lower inner support and the schematic diagram of lower support arm assembling of warmer embodiment one of the present invention；

Fig. 9 b are Fig. 9 a A portions enlarged diagram；

Figure 10 is that the ring-type electric heater of warmer embodiment one of the present invention and upper inner support, lower inner support, lower support arm assemble Schematic diagram；

Figure 11 a be ring-type electric heater and the upper inner support of warmer embodiment one of the present invention, lower inner support, lower support arm, on The schematic diagram of support arm assembling；

Figure 11 b are Figure 11 a B portions enlarged diagram；

Figure 12 is a kind of schematic diagram of structure of ring-type electric heater of the present invention；

Figure 13 is the schematic diagram of another structure of ring-type electric heater of the present invention；

Figure 14 is the schematic diagram of centrifugal blower inner air backflow；

Figure 15 is that the centrifugal blower of the present invention prevents the structural representation that inner air flows back；

The centrifugal blower that Figure 16 a are the present invention applies another structural representation on warmer；

Air flow direction schematic diagram during the shown warmer work that Figure 16 b are Figure 16 a；

Figure 17 a be ring-type electric heater and the upper inner support of the embodiment two of warmer of the present invention, lower inner support, lower support arm, The schematic diagram of one section view position of upper support arm assembling；

Figure 17 b be ring-type electric heater and the upper inner support of the embodiment two of warmer of the present invention, lower inner support, lower support arm, The schematic diagram of another section view position of upper support arm assembling；

The centrifugal blower that Figure 18 is the present invention applies the 3rd structural representation on warmer；

Label declaration in figure：

01- motors；

02- centrifugal wind wheels：21- wheel hubs, 22- centrifugal flabellums, 23- lower surfaces；

03- cylinder shells, 31- arcuation guide surfaces, 32- the first ring-type air-out passages；

04- bracket components：41- air inlets, 42- the second ring-type air-out passages, 43- inner concaves, 44- annular grooves, the upper inner supports of 45-, The upper support arms of 46-, inner support under 47-, support arm under 48-, 49- masks, 410- rings side, 411- outboard containments side, on the inside of 412- Binding side, 413- external annulus, 414- internal ring walls, 415- gaps, positioning bar in 416-, the outer positioning bars of 417-, the upper outer wing plates of 418-, Wing plate in 419- is upper, outer wing plate under 420-, interior wing plate under 421-, 422- locating slots, the screw columns of 423- first, 424- first are logical Hole, the through holes of 425- second, the screw columns of 426- second, 427- third through-holes, 428- fourth holes, 429- support arms；

05th, 05a, 05b- ring-type electric heater：51a, 51b- gas channel, 52a, 52b- radiator, 53-PTC potsherds, 54a, 54b- ring electrodes, 55a, 55b- radiating fin, 56- binding posts；

The roundabout gaps of 06-.

Embodiment

Below in conjunction with Figure of description, the present invention will be further described.

The centrifugal blower for preventing inner air backflow of the present invention, is the heater block for forming warmer, therefore hereafter tie Closing whole warmer prevents the centrifugal blower that inner air flows back from illustrating the present invention.

As shown in Fig. 1 a, Figure 16 a, Figure 18, three kinds of structures of the warmer of 360 ° of air-out of the invention are respectively illustrated, this two Kind structure has common structure and can realize same function, and to avoid repeating, hereinafter the common ground of three is given To illustrate together, the difference part to three illustrates respectively：

The warmer of 360 ° of air-out, including the centrifugal wind wheel 02 driven by motor 01, centrifugal wind wheel 02 are placed in a cylindrical shell In body 03, the first ring-type air-out passage 32, the upper end of cylinder shell 03 are formed between centrifugal wind wheel 02 and cylinder shell 03 Closing, lower end mount support component 04, bracket component 04 are provided with the air inlet 41 for being located at middle part and are looped around air inlet Second ring-type air-out passage 42 of periphery, the external port of the second ring-type air-out passage 42 is air outlet, and air inlet 21 is corresponding to be centrifuged The end face of wind wheel 02, the second ring-type air-out passage 42 is connected with the first ring-type air-out passage forms full section ring-type air-out passage, entirely Duan Huanzhuan air-out passages are built-in with ring-type electric heater 05.Described motor, it can be got up as shown in Figure 1a with a case cover, Can also be exposed as illustrated in fig 16 a.

The warmer, as shown in Fig. 1 b and Figure 16 b, motor 01 drives centrifugal wind wheel 02 to rotate, by room air from air intake Mouth 41 sucks and through full section ring-type air-out passage（That is the first ring-type air-out passage, the second ring-type air-out passage 42）Discharge, it is indoor Air flows through ring-type electric heater 05 and is heated, so circulation, and indoor air circulation is heated, so as to realize heating.Fig. 1 b, The flow direction for the air-flow that the direction of arrow in Figure 16 b, Figure 14, Figure 15 is indicated.

It is achieved in air-heating bathroom heater and heating is diffused into bathroom with 360 ° of to all the winds air-out, allows heating to be evenly distributed, Heating skewness will not be caused or keep local warm wind.Bathroom is accelerated by the cold speed to warm.Realize air-heating bathroom heater with Give people to warm oneself from the mode of surrounding parcel human body, warm wind will not dry against human body, improve the comfort of people.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to increase mobility of the air in housing, avoiding the formation of vortex reduces stream Amount, the upper end that cylinder shell 03 is closed are provided with arcuation guide surface 31, and the center of curvature of arcuation guide surface is located at cylinder shell Inner side.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to increase the suction of centrifugal wind wheel, centrifugal wind wheel 02 includes and motor connection Wheel hub 21 and the centrifugal flabellum 22 being connected with wheel hub, centrifugal flabellum 22 are hypsokinesis centrifugal flabellum.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to prevent inner air from flowing back, wind loss is reduced, improves heating air output, Noise is reduced, centrifugal wind wheel 02 has a lower surface 23, lower surface 23 and 04 roundabout cooperation of bracket component, increases inner air The resistance of backflow, to prevent inner air backflow.

Referring to Fig. 1 a, Figure 16 a, Figure 18, lower surface 23 is arcuate surface, and the outward flange of lower surface 23 is higher than inner edges；Branch Frame component 04 has inner concave 43；Inner concave 43 matches to form roundabout cooperation with arcuate surface, between inner concave 43 and arcuate surface Roundabout gap 06 is formed, the roundabout gap 06 is ensureing increase inner air backflow resistance, preventing inner air backflow（It is internal empty Gas flows back referring to Figure 14, prevents inner air backflow referring to Figure 15）While, avoid centrifugal wind wheel lower surface 23 and bracket component 04 contact and ensure centrifugal wind wheel can smooth rotation, can also avoid caused by the foozle and rigging error of parts Centrifugal wind wheel lower surface contacts interference with bracket component.The size in roundabout gap is generally 2-8mm.

Bracket component 04 has an annular groove 44, and the inward flange of lower surface 23 stretches into annular groove 44 and forms roundabout cooperation.Specifically , bracket component 04 includes upper inner support 45, and annular groove 44 is on upper inner support 45（Referring to Fig. 1 a, Figure 18）；Or support group Part 04 includes upper inner support 45, the mask 49 with the assembling of upper inner support, the common shape in position that upper inner support 45 is combined with mask 49 Into annular groove 44（Referring to Figure 16 a）.

In order to prevent inner air from flowing back, wind loss is reduced, improves heating air output, reduces noise, bracket component 04 Also there is a raised ring side 410（Referring to Fig. 1 b, Fig. 2）, ring side 410 forms roundabout cooperation around lower surface 23, as schemed institute Show that the raised ring side 410 is located on upper inner support 45.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to realize uniform air-out, centrifugal wind wheel 02 is coaxially set with cylinder shell 03 Put.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to realize more preferable heating effect, air-out direction is set to be prevented away from air inlet The air that air inlet causes air inlet to flow out with air outlet short circuit directly flows back to air outlet, outside the second ring-type air-out passage 42 The air outlet of port tilts in bell mouth shape to periphery, avoids warm wind from being dried against human body, improves the comfort of people, allows heating It is evenly distributed, accelerates bathroom by the cold speed to warm, realize that air-heating bathroom heater gives people to warm oneself in a manner of wrapping up human body from surrounding.

Referring to Fig. 1 a, Figure 16 a, Figure 18, in order to avoid preventing air inlet 41 and air outlet short circuit, accelerate the heating speed in bathroom Degree, i.e., in order to avoid the warm wind produced by boasting from air outlet is directly sucked by air inlet, bracket component 04 has outboard containment side 411st, inner side binding side 412, the external port of the second ring-type air-out passage, outside are formed between outboard containment side, inner side binding side The edge of binding side 411 is higher than the edge of inner side binding side 412, reduces the backflow that the small rising characteristic of warm air density is brought, The warm wind produced by boasting from air outlet is blocked directly to be sucked by air inlet.

Referring to Fig. 1 a, Figure 16 a, Figure 18, kept at a distance between the external port and air inlet 41 of the second ring-type air-out passage 42, So as to increase the path that the warm wind produced by boasting from air outlet flows to air inlet, so make from air outlet come out warm air as far as possible Keep spreading along air-out direction to bathroom more, hence it is evident that the short-circuit effect for reducing air outlet and air inlet occurs, and accelerates bathroom Heating speed.

04 bracket component includes mask 49, and air inlet 41 is on mask 49.

In order to increase the sectional area of airflow passes ring-type electric heater, ring-type electric heater 05 leads to full section ring-type air-out Gap 415 is kept between the side wall in road 42.Because the presence in the gap 415, air is except can be from the upper of ring-type electric heater Surface enter ring-type electric heater and be heated it is outer, can also directly through gap 415 by the side heat of ring-type electric heater, Allow windage suffered by air to diminish, increase the heating surface (area) (HS of ring-type electric heater, reduce noise, improve adding for ring-type electric heater The thermal efficiency.

Specifically, the side wall of full section ring-type air-out passage is provided with interior positioning bar 416, outer positioning bar 417, interior positioning bar The outer peripheral face positioning of 416 pairs of ring-type electric heaters 05 keeps gap, and outer positioning bar 417 is determined the inner peripheral surface of ring-type electric heater 05 Position keeps gap 415.Moreover, bracket component 04 includes internal ring wall 414, the external annulus 413 around internal ring wall 414, internal ring wall 414 The second ring-type air-out passage 42 is formed between external annulus 413.

Realizing a kind of concrete structure in the gap 416 is：Interior positioning bar 416 is set on the medial surface of external annulus 413（Referring to Fig. 2, Fig. 3）, internal ring wall 414 lateral surface on set outer positioning bar 417（Referring to Fig. 2, Fig. 4）.Now, ring-type electric heater 05 with Described gap 415 is formed between external annulus 413, between ring-type electric heater 05 and internal ring wall 414.It is interior positioning bar 416, outer fixed The width 2-5mm of position muscle 417, that is, the size for thereby determining that gap 415 is 2-5mm, interior positioning bar 416, the thickness of outer positioning bar 417 Spend about 1-5mm.

Referring to Fig. 2, Figure 17 a Figure 17 b, Figure 18, in order to reduce windage, reduce noise, improve the efficiency of heating surface and solve support Because of hanging the problem of being difficult to installation, a kind of structure of bracket component 04 is component：Including fit together upper inner support 45, Upper support arm 46, lower inner support 47, lower support arm 48, upper support arm 46 is around upper inner support 45, and lower support arm 48 is around lower interior Support 47, upper support arm 46, lower support arm 48 form external annulus 413, and upper inner support 45, lower inner support 47 form internal ring wall 414.

In view of the bracket component of said structure, for the ease of assembling ring-type electric heater, outer wing is set on upper inner support 45 Plate 418（Referring to Fig. 4）, the upper surface inward flange of the upper pressure holding ring-type electric heater 05 of outer wing plate 418；In being set on upper support arm 46 Wing plate 419（Referring to Fig. 3）, the upper surface outward flange of the upper interior pressure holding ring-type electric heater 05 of wing plate 419；Set on lower inner support 47 Outer wing plate 420（Referring to Fig. 6）, the lower surface inward flange of the lower pressure holding ring-type electric heater 05 of outer wing plate 420；Set on lower support arm 48 Wing plate 421 in lower（Referring to Fig. 5）, the lower surface outward flange of the lower interior pressure holding ring-type electric heater of wing plate 421.

Upper inner support 45, upper support arm 46, lower inner support 47, lower support arm 48 are assembled together by fastener and by rings Shape electric heater is constrained in the second ring-type air-out passage.So as to make upper inner support, upper support arm, lower inner support, lower support arm, Ring-type electric heater forms an entirety, then this is integrally assembled（Such as pass through fastener）On housing.

Upper inner support, upper support arm, lower inner support, lower support arm, ring-type electric heater are specifically assembled into integral press Following process is carried out：

Ring-type electric heater 05 is enclosed on upper inner support 45 as shown in Figure 8, outer wing plate 418 contacts ring-type electric heater in order Upper surface inward flange and support ring-type electric heater；

As Fig. 9 a, Fig. 9 b assemble lower inner support and lower support arm：The locating slot 422 of lower outer 48 framves is enclosed on lower inner support 47 The first screw column 423 on, make on lower support arm 47 first through hole 424 be aligned the first screw column 423, allow lower inner support 47 with Lower support arm 48 is into being integral；

Under ring-type electric heater together, upper inner support will be assembled shown in Fig. 8 as shown in Figure 10 together with being assembled shown in Fig. 9 a Inner support, the assembling of lower support arm：Second screw column 426 of the upper inner support 45 of the second through hole 425 alignment on lower inner support 47, under The lower surface inward flange of the pressure holding ring-type electric heater of outer wing plate 420；In lower outside the lower surface of the pressure holding ring-type electric heater of wing plate 421 Edge；Upper inner support 45, lower inner support 47, lower support arm 48 are connected to become an entirety with screw；

Overall package shown in finally as shown in Figure 11 a, Figure 11 b by upper support arm and Figure 10：Threeway on upper support arm 46 First through hole 424 on the lower support arm 48 of the alignment of hole 427, the entirety shown in Figure 10 is connected by screw with upper support arm 46 and allowed The upper surface outward flange of the pressure holding ring-type electric heater of wing plate 419 in upper, so as to make ring-type electric heater more constant；So just form Structure shown in Fig. 2.The installation method solves the problems, such as that inner support is difficult to installation because hanging.

Assembling process and structure shown in above-mentioned Fig. 8-11b, not unique implementation, it can also borrow during specific implementation Fastener such as screw is helped to be otherwise attached to fasten by upper support arm, upper inner support, lower inner support, lower support arm.Such as figure 17a, Figure 17 b then show similar assembling fastening means.

Realize that second of concrete structure in the gap 416 is as shown in figure 18：Set on the inwall of cylinder shell 03 default Position muscle 416, internal ring wall 414 lateral surface on set outer positioning bar 417.Now, ring-type electric heater 05 and cylinder shell 03 Described gap is formed between inwall, between ring-type electric heater 05 and internal ring wall 414.

In view of realizing second of concrete structure in the gap 416, bracket component can also use the another kind shown in Figure 18 Structure, the bracket component include the upper inner support 45, lower inner support 47, the support arm 429 that fit together, upper inner support 45, Lower inner support 47 forms internal ring wall 414, and support arm 429 is as external annulus and around internal ring wall 414.

In view of the bracket component of structure shown in Figure 18, for the ease of assembling ring-type electric heater, sets on upper inner support 45 Outer wing plate 418, the upper surface inward flange of the upper pressure holding ring-type electric heater 05 of outer wing plate 418；Set on the inwall of cylinder shell 03 Wing plate 419 in upper, the upper surface outward flange of the upper interior pressure holding ring-type electric heater 05 of wing plate 419；Outer wing is set on lower inner support 47 Plate 420, the lower surface inward flange of the lower pressure holding ring-type electric heater 05 of outer wing plate 420；Interior wing plate 421 is set on support arm 429, under The lower surface outward flange of the interior pressure holding ring-type electric heater 05 of wing plate 421.Moreover, upper inner support 45, lower inner support 47, support arm 429 are assembled together and ring-type electric heater 05 are constrained in into the second ring-type air-out passage 42 to go out with the first ring-type by fastener The channel attached position of wind.

When it is implemented, assembling mask 49 on the lower inner support of embodiment one as shown in Figure 1 a, 1 b, air inlet 21 is located at On mask 49；Or such as Figure 16 a, Figure 16 b, Figure 17 a, Figure 17 b illustrated embodiments two, the lower interior branch of embodiment illustrated in fig. 18 three Mask 49 is integrally formed with frame 45, air inlet is on mask.

As Figure 12, with 13 shown in, ring-type electric heater 05a/05b is integrally annular in shape, its can be completely enclosed ring-type, It can also be disconnected at some position, it has the gas channel 51a/51b axially extended, and gas channel 51a/51b is for stream Vent flow is with to the air-flow flowed through heating.

Specifically, ring-type electric heater 05a, 05b include radiator 52a/52b, radiator 52a/52b is annular in shape, air-flow Passage 51a/51b is formed on radiator 52a/52b.

The radiator 52a/52b of different-diameter is nested together, and is equipped with what is contacted with radiator between adjacent radiator PTC-ceramic piece 53, PTC-ceramic piece is produced heat PTC-ceramic piece supply electric energy and pass to radiator.

Radiator 52a/52b includes the ring electrode 54a/54b and radiating fin 55a/55b being distributed along ring electrode, gas Circulation road is formed in the side of radiating fin, ring electrode connection binding post；Ring electrode is used to supply electricity to PTC-ceramic piece Can, ring electrode typically directly contacts with PTC-ceramic piece, but is not excluded for indirectly to supplying electric energy to PTC-ceramic piece, for example entirely Radiator is by thermal conductivity material（Such as aluminum or aluminum alloy）It is made.Specifically, radiating fin is to make in ring electrode side Wing plate；Or radiating fin 55b is the wavy sheet metal with ring electrode heat conduction configuration（Referring to Figure 13）；Or radiator Gas channel handle type is opened up vertically into the gusset shape radiating fin 55a of isolation gas channel（Referring to Figure 12）.

The ring-type electric heater, makes exhaust air flue more smooth, allows whole ring-type air-out passage to be all heating passage, improves The efficiency of heating surface, installation is easier, saves cost.

Claims (9)

1. the centrifugal blower for preventing inner air from flowing back, including by motor（01）The centrifugal wind wheel of driving（02）, it is characterized in that：Institute The centrifugal wind wheel stated（02）It is placed in a cylinder shell（03）It is interior, the cylinder shell（03）One end closing, the other end dress With bracket component（04）, described bracket component（04）It is provided with the air inlet positioned at middle part（41）And enter described in being looped around Second ring-type air-out passage of air port periphery（42）, described centrifugal wind wheel（02）With a lower surface（23）, under described End face（23）With described bracket component（04）Roundabout cooperation.

2. the centrifugal blower according to claim 1 for preventing inner air from flowing back, it is characterized in that：The lower surface（23）For Arcuate surface, the outward flange of the lower surface are higher than inner edges；Described bracket component（04）With inner concave（43）；In described Concave surface（43）With described arcuate surface（23）Match to form described roundabout cooperation, shape between described inner concave and arcuate surface Into roundabout gap（06）.

3. the centrifugal blower according to claim 2 for preventing inner air from flowing back, it is characterized in that：The roundabout gap（06） Size be 2-8mm.

4. the centrifugal blower according to claim 1 or 2 for preventing inner air from flowing back, it is characterized in that：The bracket component （04）With an annular groove（44）, the lower surface（23）Inward flange stretch into described annular groove（44）Form described roundabout match somebody with somebody Close.

5. the centrifugal blower according to claim 4 for preventing inner air from flowing back, it is characterized in that：The bracket component（04） Including upper inner support（45）, described annular groove（44）Located at described upper inner support（45）On.

6. the centrifugal blower according to claim 4 for preventing inner air from flowing back, it is characterized in that：The bracket component（04） Including upper inner support（45）And the mask of the upper inner support assembling（49）, the upper inner support（45）With mask（49）With reference to Position be collectively forming described annular groove（44）.

7. the centrifugal blower according to claim 1 or 2 for preventing inner air from flowing back, it is characterized in that：The bracket component （04）With a raised ring side（410）, described ring side（410）Around the lower surface（23）Form described roundabout match somebody with somebody Close.

8. the centrifugal blower according to claim 1 for preventing inner air from flowing back, it is characterized in that：Described centrifugal wind wheel （02）With cylinder shell（03）It is coaxially disposed.

9. the centrifugal blower according to claim 1 for preventing inner air from flowing back, it is characterized in that：The second ring-type air-out Passage（42）External port in bell mouth shape to periphery tilt.