CN203548307U - Axial force balancing device of dual-stage or multistage fan - Google Patents
Axial force balancing device of dual-stage or multistage fan Download PDFInfo
- Publication number
- CN203548307U CN203548307U CN201320546641.8U CN201320546641U CN203548307U CN 203548307 U CN203548307 U CN 203548307U CN 201320546641 U CN201320546641 U CN 201320546641U CN 203548307 U CN203548307 U CN 203548307U
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- stage
- seal
- impeller
- vane wheel
- prime
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Abstract
The utility model relates to the field of fans and in particular relates to a bearing force balancing structure. An axial force balancing device of a dual-stage or multistage fan comprises a front-stage seal, a back-stage seal, a front-stage vane wheel, a back-stage vane wheel and a shell, wherein the front-stage seal is arranged between an air outlet surface of the front-stage vane wheel and the shell; the back-stage seal is arranged between an air inlet surface of the back-stage vane wheel and the shell; airflow blown by the front-stage vane wheel is guided to the back-stage vane wheel through a guide vane; the front-stage seal and the back-stage seal form a movable-static seal pair; and distance between the front-stage seal and an axis of the front-stage vane wheel is greater than distance between the back-stage seal and an axis of the back-stage vane wheel. According to the axial force balancing device of the dual-stage or multistage fan, a sealing device is capable of sealing and dividing a cavity between the front-stage vane wheel and the back-stage vane wheel, so that pressure acting on the side of the back-stage vane wheel is greater than pressure acting on the front-stage vane wheel; and a resultant force opposite to axial thrust can be generated and one part of axial thrust can be offset, so that goal can be realized; axial force can be reduced; required strength of the bearing can be reduced; and service life of the bearing is prolonged.
Description
Technical field
The utility model relates to blower fan field, relates in particular to a kind of trunnion shaft load structure.
Background technique
, in twin-stage or multistage blower fan, between two adjacent impellers, not necessarily have seal arrangement now, even if having, its effect is only also the air-flow between 2 cavitys of isolation.In fact, due to the supercharging of blower fan to air-flow, self can be subject to an axial reaction force, therefore need to use thrust-bearing.Because multistage blower fan end thrust is large, high to bearing requirement, cause bearing short working life, cost is high, and blower fan structure is complicated.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of twin-stage or multistage blower fan axial thrust balancing devices, cavity before and after cutting apart with seal arrangement sealing between level impeller, the pressure that makes to act in the pressure ratio prime of rear class impeller side is larger, just can produce one with reverse the making a concerted effort of end thrust, offset a part of end thrust, reduce the required intensity of bearing, improved bearing life.
The utility model is achieved in that a kind of twin-stage or multistage blower fan axial thrust balancing devices, comprise prime sealing, final-stage seal, prime impeller, rear class impeller and casing, described prime sealing is arranged between the outlet air surface and casing of prime impeller, described final-stage seal is arranged between the windward side and casing of rear class impeller, the air-flow that described prime impeller blows out is by the stator rear class impeller that leads, prime sealing is that static and dynamic sealing is secondary with final-stage seal, and the distance of described prime sealing and prime impeller axis is greater than the distance of final-stage seal and rear class impeller axis.
Described static and dynamic sealing pair is carbocyclic ring, dry gas seals, honeycomb seal, labyrinth seal or brush seal.
Described prime impeller and rear class impeller are on same axis.
The utility model twin-stage or multistage blower fan axial thrust balancing devices are cut apart the cavity between the level impeller of front and back with seal arrangement sealing, supercharging due to prime impeller, axial force is to point to prime impeller from rear class impeller, the pressure that the utility model makes to act in the pressure ratio prime of rear class impeller side is larger, just can produce one with reverse the making a concerted effort of end thrust, offset a part of end thrust, just can realize object, reduce axial force, reduce the required intensity of bearing, improved bearing life.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model twin-stage or multistage blower fan axial thrust balancing devices.
In figure: 1 prime sealing, 2 final-stage seals, 3 prime impellers, 4 rear class impellers, 5 casings, 6 stators.
Embodiment
Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiments are only not used in restriction scope of the present utility model for the utility model is described.In addition should be understood that those skilled in the art can make various changes or modifications the utility model after having read the content of the utility model statement, these equivalent form of values fall within the application's appended claims limited range equally.
As shown in Figure 1, a kind of twin-stage or multistage blower fan axial thrust balancing devices, comprise prime sealing 1, final-stage seal 2, prime impeller 3, rear class impeller 4 and casing 5, described prime impeller 3 and rear class impeller 4 are on same axis, described prime sealing 1 is arranged between the outlet air surface and casing 5 of prime impeller 3, described final-stage seal 2 is arranged between the windward side and casing 5 of rear class impeller 4, the air-flow that described prime impeller 3 blows out is by stator 6 guiding rear class impellers 4, prime sealing 1 is that static and dynamic sealing is secondary with final-stage seal 2, the distance of described prime sealing 1 and prime impeller 3 axis is greater than the distance of final-stage seal 2 and rear class impeller 4 axis.
In the present embodiment, described static and dynamic sealing pair is carbocyclic ring, dry gas seals, honeycomb seal, labyrinth seal or brush seal.
The utility model is arranged in bipolar or multistage blower fan.Each group movable vane and quiet stator are called one-level, one group of static and dynamic sealing are set secondary between adjacent two-stage.
Air-flow is by prime impeller 3, rear class impeller 4, be pressurized the rear generation end thrust F contrary with airflow direction, S1 is the area on prime impeller 3 air-out sides, and P1 is the pressure acting on S1, acts on the pressure F1=P1 * S1 on prime impeller 3 air-out sides; S2 is the area of rear class impeller 4 air intake sides, P2 is the pressure acting on S2, act on the pressure F2=P2 * S2 on rear class impeller 4 air intake sides, the impact of boosting due to stator 6, so P1<P2, by prime sealing 1 is set, final-stage seal 2 makes S1<S2, F1<F2.The resultant direction of F1, F2 is contrary with end thrust F, thereby reaches balancing axial thrust, reduce the number of the object of bearing, extends bearing working life.
Claims (3)
1. a twin-stage or multistage blower fan axial thrust balancing devices, comprise prime sealing (1), final-stage seal (2), prime impeller (3), rear class impeller (4) and casing (5), described prime sealing (1) is arranged between the outlet air surface and casing (5) of prime impeller (3), described final-stage seal (2) is arranged between the windward side and casing (5) of rear class impeller (4), the air-flow that described prime impeller (3) blows out is by stator (6) guiding rear class impeller (4), prime sealing (1) is that static and dynamic sealing is secondary with final-stage seal (2), it is characterized in that: the distance of described prime sealing (1) and prime impeller (3) axis is greater than the distance of final-stage seal (2) and rear class impeller (4) axis.
2. twin-stage as claimed in claim 1 or multistage blower fan axial thrust balancing devices, is characterized in that: described static and dynamic sealing is secondary is carbocyclic ring, dry gas seals, honeycomb seal, labyrinth seal or brush seal.
3. twin-stage as claimed in claim 1 or multistage blower fan axial thrust balancing devices, is characterized in that: described prime impeller (3) and rear class impeller (4) are on same axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546641.8U CN203548307U (en) | 2013-09-04 | 2013-09-04 | Axial force balancing device of dual-stage or multistage fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320546641.8U CN203548307U (en) | 2013-09-04 | 2013-09-04 | Axial force balancing device of dual-stage or multistage fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203548307U true CN203548307U (en) | 2014-04-16 |
Family
ID=50466431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320546641.8U Withdrawn - After Issue CN203548307U (en) | 2013-09-04 | 2013-09-04 | Axial force balancing device of dual-stage or multistage fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203548307U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967827A (en) * | 2013-09-04 | 2014-08-06 | 上海鼓风机厂有限公司 | Double-stage or multi-stage fan axial force balance device |
-
2013
- 2013-09-04 CN CN201320546641.8U patent/CN203548307U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103967827A (en) * | 2013-09-04 | 2014-08-06 | 上海鼓风机厂有限公司 | Double-stage or multi-stage fan axial force balance device |
| CN103967827B (en) * | 2013-09-04 | 2016-01-20 | 上海鼓风机厂有限公司 | Twin-stage or multistage blower fan axial thrust balancing devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140416 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |