CN217539095U - Centrifugal fan for preventing air leakage at dynamic seal position between impeller shaft and case - Google Patents
Centrifugal fan for preventing air leakage at dynamic seal position between impeller shaft and case Download PDFInfo
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- CN217539095U CN217539095U CN202221224897.2U CN202221224897U CN217539095U CN 217539095 U CN217539095 U CN 217539095U CN 202221224897 U CN202221224897 U CN 202221224897U CN 217539095 U CN217539095 U CN 217539095U
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- dynamic seal
- air leakage
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Abstract
The utility model relates to a centrifugal fan technical field provides a prevent centrifugal fan of dynamic seal department air leakage between impeller shaft and quick-witted case, including the impeller, the back plate of impeller has a plurality ofly to attach the blade along radial radiation arrangement in the lateral surface, it is rectangular form to attach the blade. The central line of the attached blade is a straight line or a curve. The extension line of the central line of the attached blade is intersected with the axis of the impeller. The utility model discloses can make near dynamic seal near gas pressure be little negative pressure between fan machine incasement impeller axle and the fan box, the phenomenon of fan outside air leakage through dynamic seal between impeller axle and quick-witted case inside the fan when eliminating the fan operation.
Description
Technical Field
The utility model belongs to the technical field of centrifugal fan technique and specifically relates to a prevent centrifugal fan of dynamic seal department air leakage between impeller shaft and quick-witted case.
Background
The centrifugal fan includes a centrifugal blower, a centrifugal fan, and the like. The impeller blades of the existing centrifugal fan are arranged between the front disc and the rear disc, when the fan operates, gas obtains kinetic energy under the thrust action of the blades, flows and flows out along the tangential direction, and meanwhile, negative pressure is generated in a case, so that external gas flows into the fan along an air inlet. The outer side surfaces of the two sides of the impeller, namely the front disc and the rear disc, are flat surfaces or smooth and gentle curved surfaces, and gas is extremely disordered in the case, so that the vortex turbulence phenomenon is easily generated locally, and the instantaneous positive pressure phenomenon is generated locally. Particularly, the instant positive pressure phenomenon is more frequent between the impeller rear disc and the case. Due to the existence of the instant positive pressure phenomenon, the conveyed gas is easy to leak from the seal when the dynamic seal between the impeller shaft and the box body in the case fails.
SUMMERY OF THE UTILITY MODEL
Problem to prior art exists, the utility model provides a prevent centrifugal fan of dynamic seal department air leakage between impeller shaft and quick-witted case can make near dynamic seal gas pressure be little negative pressure between fan machine incasement impeller shaft and the fan box, eliminates the phenomenon of fan when the fan moves inside through dynamic seal between impeller shaft and the quick-witted case to the outside air leakage of fan.
The technical scheme of the utility model is that:
the centrifugal fan is characterized by comprising an impeller, wherein a plurality of auxiliary blades (2) are radially arranged on the outer side surface of a rear disc (1) of the impeller along the radial direction, and the auxiliary blades (2) are in a long strip shape.
Furthermore, the central line of the attached blade (2) is a straight line or a curved line.
Further, the extension line of the central line of the auxiliary blade (2) is intersected with the axis of the impeller.
The utility model has the advantages that:
the utility model discloses a radial radiation of lateral surface at fan wheel back plate arranges a plurality of rectangular forms and attaches the blade, the realization attaches the gas between blade along with the rotatory discharge impeller of impeller and the quick-witted case, make near dynamic seal gas pressure be little negative pressure between quick-witted incasement impeller shaft of fan and the fan box, thereby change the pressure field distribution of quick-witted incasement of fan, eliminate the phenomenon of fan when the fan moves inside leak to the outside of fan through impeller shaft and quick-witted case dynamic seal, the technical problem that near dynamic seal gas pressure receives quick-witted incasement gas turbulence influence appearance malleation phenomenon and leads to leaking out of air between quick-witted incasement impeller shaft of fan and the fan box among the prior art has been solved, and the work efficiency of fan has been promoted, and simple structure, easy manufacturing.
Drawings
Fig. 1 is a schematic structural diagram of an impeller of a centrifugal fan for preventing air leakage at a dynamic seal between an impeller shaft and a case according to an embodiment of the present invention.
In the figure, 1 is a rear disc, 2 is an auxiliary blade, 3 is a main blade, and 4 is a front disc.
Detailed Description
The invention will be further described with reference to the drawings and the following detailed description.
As shown in fig. 1, the centrifugal fan for preventing air leakage at the dynamic seal between the impeller shaft and the chassis of the present invention comprises an impeller, wherein a plurality of auxiliary blades 2 are arranged on the outer surface of a back plate 1 of the impeller along the radial direction, and the auxiliary blades 2 are in a long strip shape.
The central line of the attached blade 2 is a straight line or a curve, that is, the attached blade 2 is a straight strip or a curved strip.
In the present embodiment, as shown in fig. 1, the center line of the attached blade 2 is a straight line, and the extension line of the center line of the attached blade 2 intersects with the axis of the impeller. In this embodiment, the outer side surface of the back plate 1 is a plane, so that the extension line of the center line of the auxiliary blade 2 passes through the center of the outer side surface, and the length of the auxiliary blade 2 is smaller than the difference between the outer circle radius and the inner circle radius of the back plate 1.
In this embodiment, the centrifugal fan further includes a case, an impeller shaft, a bearing, a supporting device, and the like. The machine case is of a volute structure and is provided with an inlet with a central line identical to that of the impeller shaft and an outlet with a central line in the tangential direction of the volute, and the machine case is assembled in a split mode and facilitates installation of the inner impeller. The impeller is arranged in the case, a shaft of the impeller is in dynamic seal with the case, the impeller is provided with a main blade 3 between a front disk 4 and a rear disk 1, and a plurality of auxiliary blades 2 are radially arranged on the outer side surface of the rear disk 1. The impeller shaft is used for transmitting power to drive the impeller to rotate. The bearings are used to assist in the rotation of the impeller shaft. The supporting device is used for supporting the impeller shaft and the like to stably operate. The power device such as the motor or the steam turbine or other heat engines drives the impeller shaft to rotate, and drives the impeller to apply work to the gas, so that the gas flows. The radial auxiliary blades 2 attached to the outer side surface of the impeller rear disc rotate along with the impeller to discharge gas in a gap between the impeller and a case, and micro negative pressure is formed near a dynamic seal between an impeller shaft and a fan box body in the case, so that the distribution of a pressure field in the fan case is changed, the phenomenon that the inside of the fan leaks outside the fan through the dynamic seal between the impeller shaft and the case when the fan operates is eliminated, the technical problem that the gas pressure near the dynamic seal between the impeller shaft and the fan box body in the fan case is influenced by gas turbulence in the case to cause positive pressure phenomenon to cause air leakage in the prior art is solved, the working efficiency of the fan is improved, and the impeller rear disc is simple in structure and easy to manufacture. The utility model discloses an among the centrifugal fan, the gas that is used for carrying can be air, natural gas, hydrogen, carbon dioxide gas or other gases, can carry the gas mixture that has certain dust content.
It is apparent that the above embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The above embodiments are only used for explaining the present invention, and do not constitute a limitation to the scope of the present invention. All other embodiments, which can be derived by those skilled in the art from the above-described embodiments without any creative effort, namely all modifications, equivalents and improvements made within the spirit and principle of the present application, fall within the protection scope of the present invention.
Claims (3)
1. A centrifugal fan capable of preventing air leakage at a dynamic seal position between an impeller shaft and a case is characterized by comprising an impeller, wherein a plurality of auxiliary blades (2) are radially arranged on the outer side surface of a rear disc (1) of the impeller in a radial mode, and the auxiliary blades (2) are in a long strip shape.
2. The centrifugal fan for preventing air leakage at the dynamic seal between the impeller shaft and the case as claimed in claim 1, wherein the center line of the attached blade (2) is a straight line or a curved line.
3. The centrifugal fan for preventing air leakage at the dynamic seal between the impeller shaft and the casing according to claim 1, wherein the extension line of the center line of the attached blade (2) intersects with the axis of the impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221224897.2U CN217539095U (en) | 2022-05-20 | 2022-05-20 | Centrifugal fan for preventing air leakage at dynamic seal position between impeller shaft and case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221224897.2U CN217539095U (en) | 2022-05-20 | 2022-05-20 | Centrifugal fan for preventing air leakage at dynamic seal position between impeller shaft and case |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217539095U true CN217539095U (en) | 2022-10-04 |
Family
ID=83441562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221224897.2U Active CN217539095U (en) | 2022-05-20 | 2022-05-20 | Centrifugal fan for preventing air leakage at dynamic seal position between impeller shaft and case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217539095U (en) |
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2022
- 2022-05-20 CN CN202221224897.2U patent/CN217539095U/en active Active
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