CN103321945A - Efficient Z-type labyrinth seal fan - Google Patents
Efficient Z-type labyrinth seal fan Download PDFInfo
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- CN103321945A CN103321945A CN2013102488138A CN201310248813A CN103321945A CN 103321945 A CN103321945 A CN 103321945A CN 2013102488138 A CN2013102488138 A CN 2013102488138A CN 201310248813 A CN201310248813 A CN 201310248813A CN 103321945 A CN103321945 A CN 103321945A
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- air intake
- intake pipe
- impeller
- housing
- efficient
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Abstract
The invention relates to an improved technology of a fan device, in particular to an efficient Z-type labyrinth seal fan which comprises a casing, wherein an air inlet and an air outlet are arranged on the casing, a spindle in the casing extends out of the casing, the spindle is provided with an impeller and placed in the casing, an air inlet tube is further arranged in the casing, one end of the air inlet tube is connected with the air inlet of the casing, and the other end of the air inlet tube is in butt joint with the throat portion of the impeller. The efficient Z-type labyrinth seal fan is characterized in that the end of the air inlet tube butting against the throat portion of the impeller is of a cylindrical structure, an outer stair structure is designed on the outer circumferential surface of the cylindrical structure, the small-diameter section of the outer stair structure is arranged at the outer end, an annular sleeve is welded at the outer end of the throat portion of the impeller, an inner stair structure is arranged on the annular sleeve, the large-diameter end of the inner stair structure is arranged at the outer end, the inner stair structure of the annular sleeve and the outer stair structure of the air inlet tube form a Z-type labyrinth seal structure, and certain gap is reserved between the two stair structures. The efficient Z-type labyrinth seal fan solves the problem that a traditional fan is large in air leakage and seriously affects the efficiency and is suitable for improvement of various fans.
Description
Technical field
The present invention relates to the improvement technology of Fan Equipment, especially a kind of efficient Z-type labyrinth sealing blower fan.
Background technique
Blower fan mainly forms (referring to Fig. 1) by housing 1, intake grill 10, exhaust outlet, air intake pipe 4, main shaft, draught fan impeller 2.When blower fan worked, housing and air intake pipe were state of rest, and draught fan impeller is the High Rotation Speed state, must reserve the gap between draught fan impeller throat and air intake pipe, and the large young pathbreaker of this gap is the key of fan operation efficient.When the impeller High Rotation Speed, have the negative pressure district at air intake pipe place and the positive pressure district in the housing.Under the effect of pressure reduction, this gap leaks out generation, and the large young pathbreaker of inleakage directly affects the utilization efficiency of blower fan.In traditional design, the throat of impeller is the air intake pipe osculum end outside that directly is enclosed within the horn mouth formula, for guaranteeing the High Rotation Speed of impeller, usually the monolateral gap between impeller throat and the air intake pipe is about 2.7% of air intake pipe butt end external diameter, the 4-72-11NO.8D type blower fan general take the market is example, its total head is about 1900Pa, and flow is about 20000m
3/ h, impeller throat internal diameter is 0.58m, and air intake pipe docking end outer diameter is 0.55m, and the monolateral gap of its air intake pipe and draught fan impeller throat is 0.015m.
According to Bernoulli's law;
V=(2p×ρ
-1+2gh)
1/2?……………Ⅰ
In the I formula, total head p=1900Pa; Air density ρ=1.29kg/m
3; The water column density h=0.19m of 1900Pa; Gravity acceleration g=9.8m
2/ s
In data substitution formula, calculate, the wind speed in the gap between air intake pipe and draught fan impeller throat is: 54.3m/s
S=(D
1 2-D
2 2)?×3.14/4?……………Ⅱ
In the II formula, D
1Impeller throat internal diameter is 0.58m; D
2Air intake pipe butt end external diameter is 0.55m
In data substitution formula, the cross-section area in the gap of air intake pipe and draught fan impeller throat is: 0.0266m
2
By Q=V * S, with I, the substitution of II formula can get, the inleakage Q=54.3 in the gap of intake grill and draught fan impeller throat * 0.0266 * 3600=5200m
3/ h
In sum, the leak out loss of 4-72-11NO.8DC type blower fan in the gap of the air intake pipe that is about 15mm and draught fan impeller throat is up to η=5200/20000=26%.
The shortcoming of conventional fan is as from the foregoing: because mold pressing air intake pipe precision is low, must adopt excessive air intake pipe and draught fan impeller throat gap, cause blower fan to leak out seriously, greatly reduce the efficient of blower fan.
Summary of the invention
It is large that purpose of the present invention will solve existing blower fan inleakage exactly, has a strong impact on the problem of fan efficiency, and a kind of efficient Z-type labyrinth sealing blower fan is provided.
Concrete scheme of the present invention is: improve for conventional fan, it has housing, establish intake grill and exhaust outlet on the housing, main shaft is housed in the housing stretches out outside, impeller is housed on the main shaft places housing, air intake pipe also is housed in the housing, one end of air intake pipe connects the housing intake grill, the other end docks with impeller throat, it is characterized in that: the cylindrical structure in butt end of described air intake pipe and impeller throat, the cylinder periphery is designed with outer ledge structure, and the reduced diameter section of outer ledge structure is positioned at the outer end, described impeller throat outer end is welded with the annular cover, annular puts and is shaped with interior ledge structure, and the enlarged diameter section of interior ledge structure is positioned at the outer end, and the outer ledge structure suit of the interior ledge structure of annular cover and air intake pipe consists of the Z-type labyrinth seal structure, and keep certain interval between two ledge structures, to guarantee the rotary work of impeller.
1% of monolateral gap between the interior ledge structure of the cover of annular described in the present invention and the outer ledge structure of air intake pipe≤air intake pipe butt end external diameter.
Air intake pipe described in the present invention is monolithic cylinder shape structure, or the two-part structure, and namely the Butt Section is that columnar structured+outer section is bell-mouth structure of air.
The present invention concentrates on studies through the inventor to have found this drawback of seriously leaking out of conventional fan for a long time, and has broken through the traditional design scheme, has proposed the present invention program.The present invention designs ingenious, structure is very simple, improve cost extremely low, effect is very outstanding, adopts " Z " type labyrinth seal structure in the situation of identical gap, and inleakage can reduce more than 1/2, adopt the present invention program can also conveniently carry out fine finishing, make below the monolateral gap 2mm of Z-type structure of impeller throat and air intake pipe joint, then the inleakage of blower fan of the present invention will be reduced to 1% by 26%, and effect is very surprising.There is more than one hundred million Fans market in the whole nation, can predict popularization of the present invention and will bring huge commercial value and energy-saving and cost-reducing great social benefit.
Description of drawings
Fig. 1 is the partial structurtes schematic diagram of conventional fan;
Fig. 2 is the partial structurtes schematic diagram of blower fan of the present invention;
Fig. 3 is the I place zoomed-in view among Fig. 2.
Among the figure: 1-housing, 2-impeller, 3-gap, 4-air intake pipe (traditional), 5-impeller throat, 6-air intake pipe (modified model), 7-annular cover, 8-interior ledge structure, 9-outer ledge structure, 10-intake grill.
Embodiment
Adopt the present invention program that 4-75-11N0.8D type blower fan is improved, referring to Fig. 2,3, it has housing 1, housing 1 is provided with intake grill 10 and exhaust outlet, main shaft is housed in the housing 1 stretches out housing 1 outside, impeller 2 is housed on the main shaft to be placed housing 1 (figure exhaust outlet and main shaft not to provide, belong to conventional design), air intake pipe 6 also is housed in the housing 1, one end of air intake pipe 6 connects housing 1 intake grill 10, the other end docks with impeller throat 5, particularly: described air intake pipe 6 (can also be designed to the two-part structure for monolithic cylinder shape structure, be that the butt end is columnar structured+outer section bell-mouth structure of air or other form structure), the cylinder periphery is designed with outer ledge structure 9, the reduced diameter section of outer ledge structure is positioned at the outer end, described impeller throat 5 outer ends are welded with annular cover 7, be shaped with interior ledge structure 8 on the annular cover 7, the enlarged diameter section of interior ledge structure 8 is positioned at the outer end, the interior ledge structure 8 of annular cover 7 consists of the Z-type labyrinth seal structure with the outer ledge structure of air intake pipe 69 suits, and keep certain interval 3 between two ledge structures, to guarantee the High Rotation Speed work of impeller 2.
The butt end external diameter of the air intake pipe 6 in this blower fan still keeps 0.55m, take the finish turning processing technology, guarantee the interior step of annular cover and air intake pipe outer step joint (" Z " shape structure place) monolateral gap 3 for 2mm(be the air intake pipe external diameter 0.364%), then the joint clearance cross section is long-pending is reduced to 0.003 ㎡ by 0.0226 ㎡, and the flowage friction force coefficient of ' Z ' type maze-type structure increases to 2.91(and gets by handbook is poor), loss η=54.3 * 0.003 * 3600/ (20000 * 2.91)=1% of then leaking out; The fan operation power loss is reduced to 1% by 26%.
In the above-described embodiments, as the monolateral gap with step in the annular cover and the outer step joint of air intake pipe be processed as 5mm(be the air intake pipe external diameter 0.91%), blower fan leaks out to lose and is about 8% as calculated, less than original 1/3.
In the above-described embodiments, be processed as 15mm such as the monolateral gap with the outer step joint of step and air intake pipe in the annular cover, comparable conventional construction reduces the loss of leaking out more than 1/2 as calculated.
Therefore the loss as long as " Z " type of employing sealing configuration just can decrease leaks out, certainly preferably the monolateral gap of the outer step joint of step and air intake pipe in the annular cover is worked into≤the air intake pipe external diameter 1%, under the high speed rotating and fine finishing permission situation that guarantee impeller, the little gap of trying one's best can be reduced the loss of leaking out to greatest extent.
Claims (3)
1. efficient Z-type labyrinth sealing blower fan, has housing, establish intake grill and exhaust outlet on the housing, main shaft is housed in the housing stretches out outside, impeller is housed on the main shaft places housing, air intake pipe also is housed in the housing, one end of air intake pipe connects the housing intake grill, the other end docks with impeller throat, it is characterized in that: the cylindrical structure in butt end of described air intake pipe and impeller throat, the cylinder periphery is designed with outer ledge structure, and the reduced diameter section of outer ledge structure is positioned at the outer end, described impeller throat outer end is welded with the annular cover, annular puts and is shaped with interior ledge structure, and the enlarged diameter section of interior ledge structure is positioned at the outer end, and the outer ledge structure suit of the interior ledge structure of annular cover and air intake pipe consists of the Z-type labyrinth seal structure, and keep certain interval between two ledge structures, to guarantee the High Rotation Speed work of impeller.
2. efficient Z-type labyrinth sealing blower fan according to claim 1 is characterized in that: 1% of the monolateral gap between the interior ledge structure of described annular cover and the outer ledge structure of air intake pipe≤air intake pipe butt end external diameter.
3. efficient Z-type labyrinth sealing blower fan according to claim 1, it is characterized in that: described air intake pipe is monolithic cylinder shape structure; Or the two-part structure, namely the Butt Section is that columnar structured+outer section is bell-mouth structure of air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102488138A CN103321945A (en) | 2013-06-21 | 2013-06-21 | Efficient Z-type labyrinth seal fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102488138A CN103321945A (en) | 2013-06-21 | 2013-06-21 | Efficient Z-type labyrinth seal fan |
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| Publication Number | Publication Date |
|---|---|
| CN103321945A true CN103321945A (en) | 2013-09-25 |
Family
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|---|---|---|---|
| CN2013102488138A Pending CN103321945A (en) | 2013-06-21 | 2013-06-21 | Efficient Z-type labyrinth seal fan |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204347Y (en) * | 1993-10-25 | 1995-08-02 | 沈佐华 | Structure for low-leakaged cup-jointing aspiration entry and impeller of centrifugal ventilator |
| JPH11343996A (en) * | 1998-04-02 | 1999-12-14 | Miura Co Ltd | Labyrinth seal structure of fluid machinery |
| JP2002106351A (en) * | 2000-09-28 | 2002-04-10 | Toyo Radiator Co Ltd | Seal structure of fan |
| CN1350619A (en) * | 1999-05-11 | 2002-05-22 | 西门子公司 | Side channel machine |
| US6450765B1 (en) * | 2000-06-19 | 2002-09-17 | Caterpillar Inc. | Sealing system for a centrifugal fan |
-
2013
- 2013-06-21 CN CN2013102488138A patent/CN103321945A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2204347Y (en) * | 1993-10-25 | 1995-08-02 | 沈佐华 | Structure for low-leakaged cup-jointing aspiration entry and impeller of centrifugal ventilator |
| JPH11343996A (en) * | 1998-04-02 | 1999-12-14 | Miura Co Ltd | Labyrinth seal structure of fluid machinery |
| CN1350619A (en) * | 1999-05-11 | 2002-05-22 | 西门子公司 | Side channel machine |
| US6450765B1 (en) * | 2000-06-19 | 2002-09-17 | Caterpillar Inc. | Sealing system for a centrifugal fan |
| JP2002106351A (en) * | 2000-09-28 | 2002-04-10 | Toyo Radiator Co Ltd | Seal structure of fan |
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Application publication date: 20130925 |