CN110805573B

CN110805573B - Centrifugal fan

Info

Publication number: CN110805573B
Application number: CN201911277098.4A
Authority: CN
Inventors: 张仲曦; 黄奇; 赵小喜; 游思林; 包国斌; 衡红; 麦吉昌
Original assignee: Sichuan Desheng Group Vanadium Titanium Co Ltd
Current assignee: Sichuan Desheng Group Vanadium Titanium Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2021-10-12
Anticipated expiration: 2039-12-12
Also published as: CN110805573A

Abstract

The invention discloses a centrifugal fan which comprises a hub, a middle disc, blades and a front disc, wherein the middle disc and the front disc are in an annular disc shape coaxial with the hub, the middle disc is fixedly connected to the hub, two axial sides of the middle disc are respectively provided with the front disc, and the blades which are clamped and fixed by the middle disc and the front disc and are distributed at intervals along the circumferential direction of the hub axis are arranged between the middle disc and the front disc. The centrifugal fan has a structure of front disk-blade-middle disk-blade-front disk, has good aerodynamic performance and mechanical performance, prolongs the service life, reduces the maintenance frequency of workers, ensures the efficient operation of an impeller assembly of the centrifugal fan, improves the overall safety performance of the fan and reduces the use and maintenance cost of fan equipment.

Description

Centrifugal fan

Technical Field

The invention relates to the technical field of fans, in particular to a centrifugal fan.

Background

The centrifugal fan is mainly composed of a casing, an inlet collector, an impeller, a motor and other parts, and the impeller rotating at high speed is used for accelerating gas, then decelerating and changing the flow direction so as to convert kinetic energy into potential energy (pressure). In a single stage centrifugal fan, the gas enters the impeller from an axial direction, changes to a radial direction as it flows through the impeller, and then enters the diffuser. In diffusers, the gas changes flow direction and the increase in conduit cross-sectional area slows the gas flow, which converts kinetic energy into pressure energy. The pressure increase occurs primarily in the impeller and secondarily in the diffusion process, in a multistage centrifugal fan, with a return flow to bring the air flow into the next impeller, creating a higher pressure.

The impeller is a core component of the centrifugal fan, the pneumatic performance of the existing centrifugal fan impeller is low, the required flow and pressure are difficult to meet, the structural stability of the impeller is poor, the service life of the impeller is short, frequent maintenance and replacement are needed, the maintenance cost is high, and the normal production efficiency is influenced.

Disclosure of Invention

The invention aims to solve the technical problems and provide a technical task of improving the prior art, and provides an impeller assembly of a centrifugal fan, which solves the problems of poor structural stability, low pneumatic performance, frequent maintenance and high cost of the impeller of the centrifugal fan in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides an impeller subassembly of centrifugal fan, includes wheel hub, well dish, blade and front plate, well dish, front plate are the annular disc with the wheel hub axle center, well dish fixed connection on wheel hub, be provided with a front plate respectively in well axial both sides, set up between well dish and front plate by fixed and a plurality of blades along the circumference interval distribution in wheel hub axle center of both centre grippings. The impeller assembly of the centrifugal fan forms a front disc-blade-center disc-blade-front disc structure, the structure is high in strength and good in stability, the impeller assembly is not easy to damage and long in service life, maintenance frequency and cost are reduced, gas enters the impeller assembly from two axial ends and is discharged after being changed into a radial direction from the impeller assembly, pneumatic performance is good, operation efficiency is high, and the required flow and pressure can be met.

Furthermore, the radial middle area of the surfaces of the two axial sides of the middle disc is provided with a thickened reinforcing plate, so that the structural strength and stability of the middle disc are improved, and the deformation and damage of the middle disc are avoided.

Furthermore, the axial both sides of well dish are still consolidated through conical plate and wheel hub and are connected, and conical plate, well dish and wheel hub constitute triangle reinforced structure on the axial direction of wheel hub, effectively improve structural stability, increase of service life.

Furthermore, the blade is made of a composite plate with a wear-resistant layer, the surface hardness HRC is greater than 56, the wear resistance of the blade is improved, the wear of the blade is reduced, and the service life of the blade is prolonged.

Furthermore, the blades are in an arc shape which deviates from the radial direction of the hub, the pneumatic performance is good, the operation efficiency is high, and the required flow and pressure can be met.

Furthermore, the width of the blade along the axial direction of the hub is reduced outwards along the radial direction, the pneumatic performance is good, and the required flow and pressure are met.

Further, the both sides surface of well dish still is provided with the backplate that sets up along the arc route of blade, can improve the structural strength of well dish, and the backplate plays the effect of consolidating the support to the blade simultaneously, improves the structural stability of blade, avoids blade and well junction fracture, increase of service life to appear.

Furthermore, the guard plate is divided into two sections along the length direction of the arc-shaped path, the thickness of the guard plate close to the radial inner side is larger than that of the guard plate close to the radial outer side, and the structural stability is good.

Furthermore, the guard plate is provided with holes distributed at intervals along the arc-shaped path, so that the weight is reduced, and the running load is reduced.

Furthermore, the peripheral edge of the center plate is provided with a notch groove positioned between adjacent blades, so that the weight of the center plate is reduced, and the pneumatic performance can be improved.

Compared with the prior art, the invention has the advantages that:

the impeller assembly of the centrifugal fan has good aerodynamic performance and mechanical performance, adopts a wear-resistant treatment technology, prolongs the service life, reduces the maintenance frequency of workers, ensures the efficient operation of the impeller assembly of the centrifugal fan, improves the overall safety performance of the fan, and reduces the use and maintenance cost of fan equipment.

Drawings

FIG. 1 is a schematic view of the overall structure of an impeller assembly assembled within a casing;

FIG. 2 is a side view of the impeller assembly;

FIG. 3 is a schematic view of the structure of the surface direction of the middle tray;

FIG. 4 is a schematic view of detail A in FIG. 3;

fig. 5 is a schematic view of the mounting gap between the collector and the front disk of the impeller assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The impeller assembly of the centrifugal fan disclosed by the embodiment of the invention has the advantages of good pneumatic performance, fan efficiency improvement, structural stability, long service life and maintenance frequency and cost reduction.

As shown in fig. 1 to 4, an impeller assembly of a centrifugal fan mainly includes a hub 54, a middle disc 51, blades 52 and a front disc 53, wherein the middle disc 51 and the front disc 53 are annular discs coaxial with the hub 54, the middle disc 51 is fixedly connected to the hub 54, two axial sides of the middle disc 51 are respectively provided with one front disc 53, a plurality of blades 52 which are clamped and fixed by the middle disc 51 and the front disc 53 and are distributed at intervals along the circumferential direction of the axis of the hub 54 are arranged between the middle disc 51 and the front disc 53, the blades 52 are connected with the middle disc 51 and the front disc 53 by welding, and the impeller assembly 5 forms a structure of front disc-blade-middle disc-blade-front disc, which has high strength and good stability, and the blades are not easily deformed or damaged;

in this embodiment, the hub 54 of the impeller assembly 5 is fixed in the middle of the main rotating shaft 2 in a sleeving manner, the main rotating shaft 2 penetrates into the casing 4, the whole impeller assembly is located inside the casing 4, the casing 4 is provided with an air inlet and an air outlet, the casing 4 is internally fixed with a current collector 3, the outlet of the current collector is over against the front disc 53, the current collectors 3 are respectively arranged at two axial sides of the impeller assembly 5, the casing 4 is provided with two air inlets which are respectively communicated with the inlets of the two current collectors 3, and the air outlet of the casing 4 is arranged on a radial area opposite to the impeller assembly 5;

specifically, thickened reinforcing plates 55 are arranged in the radial middle regions of the surfaces of the two sides of the middle disc 51, the structural strength of the radial middle regions of the middle disc 51 is enhanced, namely the structural strength of the joint of the middle disc 51 and the hub 54 is enhanced, the middle disc 51 is prevented from deforming and breaking, the middle disc 51 and the reinforcing plates 55 are made of 16Mn materials, specifically, the reinforcing plates 55 are in a circular ring shape and comprise a first reinforcing plate located on one side of the middle disc 51, a second reinforcing plate located on the other side of the middle disc 51 and a third reinforcing plate located on the periphery of the circumference of the second reinforcing plate, the thickness of the second reinforcing plate is larger than that of the first reinforcing plate and the third reinforcing plate, and through holes for the bolts connected with the hub 54 to penetrate through are formed in the first reinforcing plate and the second reinforcing plate; the two axial sides of the middle disc 51 are fixedly connected with the hub 54 through conical plates 56 in a circular truncated cone shape, and the conical plates 56 are made of wear-resistant composite plates, so that the wear resistance is improved, and the service life is prolonged;

in this embodiment, 10 blades 52 are uniformly arranged along the circumferential direction of the main rotating shaft 2 at intervals, so that good aerodynamic performance is ensured, and the blades 52 are made of a composite plate with a wear-resistant layer, so that the wear resistance is improved, and the wear of the blades is reduced, specifically, the composite plate with the wear-resistant layer can be manufactured by adopting the modes of nano-spraying of hard alloy, sticking of a ceramic plate, welding and riveting of a wear-resistant steel plate, using of a composite steel plate and the like, and the surface hardness HRC is more than 60; in addition, a wear-resistant reinforcing layer 521 is arranged on the end surface of the blade 52 close to the hub 54, so that the wear resistance of the blade is further improved, and the service life is prolonged;

the blades 52 are in an arc-shaped plate-shaped structure inclined to the radial direction of the main rotating shaft 2, the width of the blades 52 in the axial direction of the main rotating shaft 2 is reduced along the radial direction outwards, so that the front disc 53 integrally has a certain taper in the axial direction, the front disc 53 is in butt joint with the current collector 3, the diameter of an outlet of the current collector 3 is smaller than that of the front disc 53 by 8-10 mm, a radial gap is formed between the front disc 53 and an outlet of the current collector 3, good aerodynamic performance is ensured, and the operation efficiency is improved, as shown in fig. 5, when the installation gap between the current collector 3 and the front disc of the impeller assembly 5 is required to be in a cold state, the installation gap between the outlet of the current collector and the upper side of the inlet of the front disc is 7.5-8.5mm, the installation gap between the lower side of the current collector is 3.5-4.5mm, the gaps between the left side and the right side of the front disc are 5.5mm, and the gap between the center line of the air inlet of the machine shell is 2 mm; the two side surfaces of the middle disc 51 are also provided with 10 guard plates 57 arranged along the arc-shaped path of the blades 52, the guard plates 57 are also provided with 10 corresponding to the blades 52, the guard plates 57 can improve the structural strength of the middle disc and effectively improve the structural stability of the blades 52 at the same time, the service life is prolonged, a plurality of holes are arranged on the guard plates 57 at intervals along the arc-shaped path, the weight is reduced, the running load is reduced, the guard plates are divided into two sections along the length direction of the arc-shaped path, and the thickness of the guard plates close to the radial inner side is larger than that of the guard plates close to the radial outer side;

the peripheral edge of the middle disc 51 is provided with a gap 511 positioned between the adjacent blades 52, so that the weight of the middle disc is reduced, the aerodynamic performance is improved, and the edge of the gap 511 close to the protecting plate 57 is an edge along the arc path of the protecting plate 57.

The front disc is provided with a reinforcing piece 531 along the circumferential direction of the front disc, the reinforcing piece 531 comprises an inlet reinforcing piece which is arranged on the edge of a mouth part of the front disc 53, the mouth part of the front disc 53 is far away from the middle disc 51, the inlet reinforcing piece is integrally annular, the cross section of the inlet reinforcing piece is rectangular, the reinforcing piece 531 further comprises an outlet reinforcing piece which is arranged at one end of the front disc 53, which is close to the middle disc 51, the structural strength of the front disc is improved, and the structural stability of the blade is guaranteed.

Carrying out high temperature resistant treatment on the impeller assembly 5, spraying antirust paint containing iron oxide red on the surface, spraying the antirust paint containing iron oxide red on the surface, wherein the thickness of the primer is at least 40-50 mu m, the thickness of the finish paint is at least 60 mu m, and carrying out sand blasting rust removal treatment before spraying; a reinforcing rib of No. 10 channel steel is arranged on the casing, and the casing is in a full-welding left-hand thread form; the number of the stay bars of the casing is determined according to the size of the casing, the stay bars are reserved and cut off after installation and are distinguished by colors, the diameter of the stay bar steel pipe is between 50 and 80mm and cannot be larger than 100mm, full welding is required, and a hinge type manhole door is further arranged on the casing.

Set up the bearing seal subassembly 6 that supplies 2 tip of main pivot to wear out casing 4 on the casing 4, and the device still has the cooling impeller 7 that is located the 6 outsides of bearing seal subassembly on the main pivot 2, cooling impeller 7 is 24.2mm at 2 axial intervals of main pivot with bearing seal subassembly 6 at least, cooling impeller 7 is split type structure, connect into annular whole through the bolt, bearing seal subassembly 6 comprises steel sheet and resistant oil rubber asbestos, the steel sheet is close to casing 4 inboards, resistant oil rubber asbestos is close to the casing outside, resistant oil rubber asbestos is integral non-dissection structure, resistant oil rubber asbestos cover is on main pivot 2, resistant oil rubber asbestos is 5mm along 2 axial thickness of main pivot.

The two ends of the main rotating shaft 2 are erected on the bearing assembly 1, the bearing assembly 1 is a rolling bearing, the bearing model is 22244CC, the inner wall of the bearing assembly 1 is provided with a temperature probe and a vibration measuring probe, the working condition of an impeller assembly of the centrifugal fan is monitored in real time, maintenance operation can be carried out in time when temperature and vibration are abnormal, signals detected by the temperature probe and the vibration measuring probe in the field are transmitted to a HIM display interface of a central control cabinet for monitoring by field operators, the operating parameters of the high-temperature centrifugal fan are regulated and controlled in time, and safety accidents are avoided; one end of the main rotating shaft 2 is connected with a motor 9 through a diaphragm coupling 8 for transmission, so that flexible transmission is realized.

The main rotating shaft 2 is of a structure with a thick middle part and two thin ends, and is manufactured by rough machining and finish machining of a 35GrMoA blank forging, the forging is not allowed to have the defects of slag inclusion, air holes, looseness, cracks and the like, and materials need to be subjected to ultrasonic flaw detection and qualified flaw detection data is issued; the main rotating shaft needs to be forged and quenched and tempered after forging, and the mechanical property of the quenched and tempered material needs to meet sigma_b≥850MPa，σ_s≥600MPa，σ₅The concentricity of the outer circles is controlled by cutting off all the outer circles once, wherein the psi is more than or equal to 12 percent, the psi is more than or equal to 45 percent, AKu is more than or equal to 40J, HB is 230-280.

The method comprises the following steps that (1) trial run is carried out before an impeller assembly of the centrifugal fan leaves a factory, the continuous operation time is not less than 1 hour after the bearing temperature is stable, the bearing temperature is not more than 60 ℃, the factory test is only carried out, the temperature rise is not more than 30 ℃, and the bearing vibration is not more than 4.6 mm/S; and the oil in the bearing assemblies was SOVG46, the oil capacity of the individual bearing assemblies was 8.5 liters, and the total flow rate of oil was 8.5L/min.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. A centrifugal fan is characterized by comprising a hub (54), a middle disc (51), blades (52) and a front disc (53), wherein the middle disc (51) and the front disc (53) are annular discs coaxial with the hub (54), the middle disc (51) is fixedly connected to the hub (54), the two axial sides of the middle disc (51) are respectively provided with one front disc (53), a plurality of blades (52) which are clamped and fixed by the middle disc (51) and the front disc (53) and are distributed at intervals along the circumferential direction of the axis of the hub (54) are arranged between the middle disc (51) and the front disc (53), the front disc (53) integrally has a taper in the axial direction, the front disc (53) is butted with a current collector (3), a radial gap is formed between the front disc (53) and an outlet of the current collector (3), a mounting gap between the current collector (3) and the front disc (53) is 7.5-8.5mm in the cold state, the upper side mounting gap between the outlet of the current collector and the inlet of the front disc, the lower side installation gap is 3.5-4.5mm, the left and right side gaps are 5.5mm, the gap between the center line of the machine shell and the center of the air inlet is 2mm, and the center of the air inlet is lower than the center line of the machine shell.

2. The centrifugal fan according to claim 1, wherein a radially central region of both axial side surfaces of the middle disk (51) is provided with a thickened reinforcing plate (55).

3. The centrifugal fan according to claim 1, wherein the two axial sides of the central disc (51) are further connected with the hub (54) in a reinforcing manner through conical plates (56).

4. The centrifugal fan as recited in claim 1, wherein the blades (52) are formed from composite plates having a wear resistant layer.

5. The centrifugal fan of claim 1 wherein the blades (52) are arcuate in shape that is skewed radially of the hub (54).

6. The centrifugal fan of claim 5, wherein the width of the blades in the axial direction of the hub decreases radially outward.

7. The centrifugal fan according to claim 5, wherein both side surfaces of the middle disk (51) are further provided with a guard plate (57) disposed along an arc-shaped path of the blade (52).

8. The centrifugal fan according to claim 7, wherein the shroud (57) is divided into two sections along the length of the arcuate path, the radially inner shroud having a thickness greater than the radially outer shroud.

9. The centrifugal fan according to claim 8, wherein the shroud (57) is perforated with holes spaced along an arcuate path.

10. The centrifugal fan according to any one of claims 1 to 9, wherein the outer peripheral edge of the central disk (51) is provided with a gap groove (511) between adjacent blades (52).