CN216199225U

CN216199225U - Anti-surge structure of double-suction impeller shaft disc of centrifugal fan

Info

Publication number: CN216199225U
Application number: CN202122751950.6U
Authority: CN
Inventors: 邱发平
Original assignee: Guangzhou Xinfeng Fan Co ltd
Current assignee: Guangzhou Xinfeng Fan Co ltd
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-04-05
Anticipated expiration: 2031-11-10

Abstract

The utility model discloses a double-suction impeller shaft disc anti-surge structure of a centrifugal fan, wherein an impeller comprises a shaft disc, two front discs, a middle disc arranged between the two front discs, a plurality of blades arranged between the middle disc and the front discs and two reinforcing guide plates; one end of each of the two reinforcing guide plates is connected to the two sides of the middle disc, the other end of each of the two reinforcing guide plates is connected to the two ends of the shaft disc, and the reinforcing guide plates are arranged obliquely relative to the middle disc. The double-suction impeller shaft disc anti-surge structure is characterized in that reinforcing guide plates are arranged on two sides of a middle disc, air enters from two sides of an impeller, the reinforcing guide plates can guide and rectify air flows entering from two sides, vortex is prevented from being formed at the air inlet position of the impeller, the efficiency of a centrifugal fan is effectively improved, the reinforcing guide plates can also play a role in increasing strength, surge of the centrifugal fan during operation is reduced, operation noise is reduced, the metal use fatigue resistance of the impeller is improved, and the service life is prolonged.

Description

Anti-surge structure of double-suction impeller shaft disc of centrifugal fan

Technical Field

The utility model relates to an anti-surge structure of a double-suction impeller shaft disc of a centrifugal fan.

Background

The shaft disc and the middle disc of the double-suction impeller of the existing centrifugal fan are fixed by bolts or riveting, rivets or bolts, retaining washers and the like need to be configured, and the bolts or the rivets are easily abraded, washed and fixed by the influence of temperature and media when the centrifugal fan runs for a long time, and are also easily loosened; in addition, the double-suction impeller of the existing centrifugal fan has no anti-surge structure and no flow guide device, airflow forms vortex after air inlet, and the efficiency of the fan is reduced.

SUMMERY OF THE UTILITY MODEL

According to one aspect of the utility model, a double-suction impeller shaft disc anti-surge structure of a centrifugal fan is provided, wherein the impeller comprises a shaft disc, two front discs, a middle disc arranged between the two front discs, a plurality of blades arranged between the middle disc and the front discs and two reinforcing guide plates; one ends of the two reinforcing guide plates are respectively connected to two sides of the central disc, the other ends of the two reinforcing guide plates are respectively connected to two ends of the shaft disc, and the reinforcing guide plates are obliquely arranged relative to the central disc.

The double-suction impeller shaft disc anti-surge structure is characterized in that reinforcing guide plates are arranged on two sides of a middle disc, air enters from two sides of an impeller, the reinforcing guide plates can guide and rectify air flows entering from two sides, vortex is prevented from being formed at the air inlet position of the impeller, the efficiency of a centrifugal fan is effectively improved, the reinforcing guide plates can also play a role in increasing strength, surge of the centrifugal fan during operation is reduced, operation noise is reduced, the metal use fatigue resistance of the impeller is improved, and the service life is prolonged.

In some embodiments, the vane has an air intake face that is an arcuate face.

From this, set up the inlet surface of blade into the effect that the arcwall face can play the water conservancy diversion, prevent that the swirl from producing, improve centrifugal fan's energy efficiency ratio.

In some embodiments, a tangent to the arc apex of the air intake surface is at a first angle to the axial direction of the impeller.

In some embodiments, the first angle is between 5 ° and 8 °.

In some embodiments, the central disc is arranged along the radial direction of the impeller, and one end of the central disc is welded and fixed on the shaft disc.

Therefore, the loosening failure of bolt or rivet fixing between the shaft disc and the central disc can be prevented.

In some embodiments, the angle of inclination between the reinforcing baffle and the centerpan is between 12 ° and 15 °.

From this, will strengthen the slope of guide plate and set up and can play better water conservancy diversion effect, can form triangle-shaped bearing structure simultaneously, intensity and stability are better.

In some embodiments, the blade has a chamfered surface that conforms to the reinforcing baffle.

In some embodiments, the chamfer is at a second angle from a radial direction of the impeller, the second angle being the same as the angle of inclination between the reinforcing baffle and the centerdisk.

In some embodiments, one end of the reinforcing baffle is welded to the middle disc, and the other end of the reinforcing baffle is welded to the shaft disc.

Therefore, the reinforced guide plate is more firmly connected with the middle disc and the shaft disc, and the strength is ensured.

Drawings

FIG. 1 is a schematic partial cross-sectional view of a double suction impeller hub anti-surge structure for a centrifugal fan according to some embodiments of the present invention;

FIG. 2 is a schematic view of a blade structure of an anti-surge structure of a double suction impeller hub of a centrifugal fan according to some embodiments of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1 schematically shows a centrifugal fan double suction impeller hub anti-surge structure according to an embodiment of the present invention. As shown, the double suction impeller 100 of the centrifugal fan (not shown) includes a shaft disk 110, two front disks, a middle disk 140 disposed between the two front disks, a plurality of blades 170 disposed between the middle disk 140 and the front disks, and two reinforcing guide plates;

as shown in fig. 1, a hub 110 is provided at a central position of the impeller 100 for connecting the impeller 100 with a driving motor (not shown) of a centrifugal fan, so that the impeller 100 is rotated by a driving force of the driving motor.

As shown in fig. 1, the two front disks are a first front disk 120 and a second front disk 130, respectively, the first front disk 120 and the second front disk 130 are respectively disposed on two sides of an axial L of the impeller 100, and the center positions of the first front disk 120 and the second front disk 130 are air inlets, that is, both sides of the axial L of the impeller 100 can intake air. The front disc is provided with a straight line section and an arc section which are connected and arranged, the arc section is arranged at one end close to the shaft disc 110 in the radial direction R of the impeller 100, the straight line section is arranged at one end far away from the shaft disc 110, and the straight line section is obliquely arranged relative to the radial direction R of the impeller 100.

As shown in fig. 1, the middle disc 140 is disposed between the first front disc 120 and the second front disc 130, the middle disc 140 is disposed along the radial direction R of the impeller 100, and one end of the middle disc 140 is welded and fixed to the middle portion of the sidewall of the shaft disc 110, so that the loosening failure of the bolt or rivet fixing between the shaft disc 110 and the middle disc 140 can be prevented, and the surge during the operation of the fan can be reduced.

As shown in fig. 1, two reinforcing baffles are a first reinforcing baffle 150 and a second reinforcing baffle 160, respectively, one end of the first reinforcing baffle 150 is connected to one side of the middle disc 140, the other end is connected to one end of the side wall of the shaft disc 110 along the axial direction L, one end of the second reinforcing baffle 160 is connected to the other side of the middle disc 140, the other end is connected to the other end of the side wall of the shaft disc 110 along the axial direction L, the first reinforcing baffle 150 is obliquely arranged with respect to the middle disc 140 at an angle c of 12 ° -15 °, preferably 13 °, that is, the first reinforcing baffle 150 and the second reinforcing baffle 160 are symmetrically arranged with respect to the middle disc 140, the cross section of the first reinforcing baffle 150 and the second reinforcing baffle 160 along the axial direction L is formed into a substantially conical shape, which can form a triangular support structure with the middle disc 140 and the shaft disc 110, the strength and stability are better.

Be provided with the enhancement guide plate in the both sides of mesodial 140, impeller 100 is two sides admit air, strengthen the effect that the guide plate can cross the air current that gets into to both sides and play water conservancy diversion and rectification, avoid forming the swirl in impeller 100 air inlet department, effectively improve centrifugal fan's efficiency, strengthen the effect that the guide plate can also play the gaining in strength, reduce the surge of centrifugal fan when the operation, reduce the running noise, improve impeller 100 metallic use antifatigue, increase of service life.

Furthermore, one end of the reinforcing guide plate is welded and fixed with the middle disc 140, and the other end of the reinforcing guide plate is welded and fixed with the shaft disc 110, so that the reinforcing guide plate is more firmly connected with the middle disc 140 and the shaft disc 110, and the strength is ensured.

As shown in fig. 1 and 2, the plurality of blades 170 are disposed between the first front plate 120 and the middle plate 140 and between the second front plate 130 and the middle plate 140, the plurality of blades 170 are uniformly disposed along the circumferential direction, the blades 170 have air inlet surfaces 171, the air inlet surfaces 171 are surfaces of the blades 170 close to the hub 110, the air inlet surfaces 171 are arc surfaces 171, and the air inlet surfaces 171 of the blades 170 are arranged as the arc surfaces 171, so that the function of guiding flow is achieved, vortex generation is prevented, surge and noise generated by collision between vortex flow and the blades 170 are reduced, and the energy efficiency ratio of the centrifugal fan is improved.

Further, a tangent to the arc apex of the air inlet surface 171 makes a first angle a of 5 ° to 8 °, preferably 8 °, with the axial direction L of the impeller 100.

Further, as shown in fig. 2, the vane 170 has a chamfered surface 172, and the chamfered surface 172 is attached to the reinforcing baffle. The chamfer 172 forms a second angle b (namely the inclination angle of the chamfer 172 and the central disc 140) with the radial direction R of the impeller 100, the second angle b is the same as the inclination angle between the reinforcing guide plate and the central disc 140, the range of the second angle b is also 12-15 degrees, and when the inclination angle c between the reinforcing guide plate and the central disc 140 is 13 degrees, the second angle b is also set to 13 degrees, so that the chamfer 172 can be perfectly attached to the side surface of the reinforcing guide plate, and the airflow can smoothly flow to the blade 170 after being guided by the reinforcing guide plate, thereby preventing surging, noise and the like generated by turbulent flow of the airflow.

Further, the blades 170 are fixed to the front disk, the middle disk 140 and the reinforcing baffle by welding.

The anti-surge structure of the shaft disc 110 of the double-suction impeller 100 is provided with the reinforced guide plates at two sides of the middle disc 140, the impeller 100 is fed at two sides, the reinforced guide plates can play a role in guiding and rectifying air flow entering at two sides, vortex is prevented from being formed at the air inlet part of the impeller 100, the efficiency of a centrifugal fan is effectively improved, the reinforced guide plates can also play a role in increasing strength, surge of the centrifugal fan during operation is reduced, operation noise is reduced, the metal use anti-fatigue degree of the impeller 100 is improved, and the service life is prolonged; the provision of the vane 170 having the arc-shaped surface 171 and the chamfered surface 172 can provide better flow guiding and anti-surge effects.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second", "at least one", are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

The above embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto. There are many variations of the shapes, constructions and principles of the utility model. Therefore, any changes and modifications made without departing from the spirit and scope of the present invention should be covered within the scope of the present invention. Where the term "preferred" is used throughout the present disclosure, it is intended that it be exclusive and mean "preferred", rather than limiting, and that the terms in the claims be given their broadest interpretation consistent with the description of the utility model.

Claims

1. The double-suction impeller shaft disc anti-surge structure of the centrifugal fan is characterized in that the impeller comprises a shaft disc, two front discs, a middle disc arranged between the two front discs, a plurality of blades arranged between the middle disc and the front discs and two reinforcing guide plates;

one ends of the two reinforcing guide plates are respectively connected to two sides of the central disc, the other ends of the two reinforcing guide plates are respectively connected to two ends of the shaft disc, and the reinforcing guide plates are obliquely arranged relative to the central disc.

2. The anti-surge structure for the double suction impeller hub of the centrifugal fan as claimed in claim 1, wherein the blades have an air inlet surface, and the air inlet surface is an arc-shaped surface.

3. The impeller hub antisurge structure of a centrifugal fan double suction impeller of claim 2, wherein a tangent to an arc apex of the air intake surface forms a first angle with an axial direction of the impeller.

4. The impeller hub antisurge structure of a centrifugal fan double suction impeller of claim 3, wherein said first angle is 5 ° -8 °.

5. The anti-surge structure for the shaft disc of the double-suction impeller of the centrifugal fan according to claim 1, wherein the middle disc is arranged along the radial direction of the impeller, and one end of the middle disc is welded and fixed on the shaft disc.

6. The anti-surge structure for the double-suction impeller hub of the centrifugal fan as claimed in claim 5, wherein the inclination angle between the reinforcing baffle and the central disk is 12-15 °.

7. The anti-surge structure for a double suction impeller hub of a centrifugal fan as claimed in claim 6, wherein the blades have chamfered surfaces which are attached to the reinforcing baffle.

8. The centrifugal fan double suction impeller hub anti-surge structure of claim 7, wherein the chamfer makes a second angle with a radial direction of the impeller, the second angle being the same as an angle of inclination between the reinforcing baffle and the center disk.

9. The anti-surge structure for the shaft disc of the double-suction impeller of the centrifugal fan according to claim 1, wherein one end of the reinforcing guide plate is welded and fixed with the middle disc, and the other end of the reinforcing guide plate is welded and fixed with the shaft disc.