CN202007882U

CN202007882U - Overdrive gear box for centrifugal fan

Info

Publication number: CN202007882U
Application number: CN2011200567790U
Authority: CN
Inventors: 王中军; 孙正兰; 缪小军
Original assignee: JIANGSU JINTONGLING FLUID MACHINERY TECHNOLOGY Co Ltd
Current assignee: JIANGSU JINTONGLING FLUID MACHINERY TECHNOLOGY Co Ltd
Priority date: 2011-03-07
Filing date: 2011-03-07
Publication date: 2011-10-12
Anticipated expiration: 2021-03-07

Abstract

The utility model provides a single-step overdrive gear box for a centrifugal fan, which has the same structure as a normal gear box. A big spiral angle ranging from 15 degrees to 17 degrees and a smaller tooth width ranging from 80mm to 100mm are adopted. Thrust bearings are connected to two ends of a rotary shaft to substitute thrust disks, and wide diameter ratio of the thrust bearings ranges from 0.4 to 0.65. A shaft seal is an oblique tooth type non-contact comb tooth seal, axial size is reduced, and assembly is convenient. A volute is directly connected with an overdrive box flange, a transition flange is omitted, and the rotary shaft can beneficially remain safe and stable in high-speed rotation. An oil pump gear is connected to a gear box low-speed shaft to transmit power and rotating speed to a main oil pump for lubrication and cooling, and operation space is saved. The overdrive gear box is compact in structure, light in weight, low in cost, reliable in sealing, stable in operation and low in noise, the rotary shaft is high in rotating speed and high in transmitting power, and the overdrive gear box belongs to overload high-speed gear boxes and can be used for connecting impellers with different weights such as aluminum alloy impellers, stainless steel impellers and the like.

Description

The centrifugal blower step-up gear

Technical field

It is to be my company's specification that the utility model provides a kind of single-stage high-speed centrifugal blower step-up gear (hereinafter to be referred as speedup box)

Background technique

This equipment is widely used in the centrifugal blower of installing and using in fields such as chemical industry, electric power, metallurgy, sewage treatment, speedup box be by motor by the lamination flexible coupling drive lower velocity shaft come transmitting torque and and motion, through speedup box the high speed shaft speedup is arrived working speed, impeller directly is connected the axle head of high speed shaft by the high strength pull bar, high speed shaft drives impeller high speed rotating, produce the pressure and the flow that need, to meet the need of market.

Along with market is more and more higher to the requirement of air quantity and pressure, the transmitted power of one-stage centrifugal blower fan and rotating speed require bigger, the centrifugal blower of big flow need be equipped with step-up gear, and this gear-box requires higher to casing intensity, the strength of gear teeth, lubrication system, design bearing and sealing etc.But other enterprises are all inadequate to the dynamic analysis of processing technology of components, assembling, rotor-support-foundation system in researching and developing such product process.

Number of patent application is the disclosed speed-increasing gearbox of wind driven generator of the specification of CN200620068477.4, casing is divided into toggle, upper box and lower box, transition gear axle, output gear shaft all adopt three bearings, though can improve bearing capacity, the easy accessibility of gear-box, but volume is bigger, rotating speed is not high enough, the rate of fault height.

In 2006 " the international academic meeting paper collection of the 15 Chinese mechanism and machine science ", publication " Large-scale Wind Turbines gear-box optimal design and program analysis " literary composition, the transmission scheme that proposes closed planetary gear system is better than the conclusion of 1 grade of planet+2 grade parallel axes, but to the improvement of traditional step-up gear and for proposing concrete solution.

The model utility content

Model utility purpose: overcome the defective that traditional centrifugal blower step-up gear rotating speed and load can not be taken into account, a kind of centrifugal blower step-up gear with heavily loaded high-speed type of large helix angle, low facewidth gear is provided.

Technological scheme: one-stage centrifugal blower fan step-up gear of the present utility model, have the structure of conventional gear-box, gearwheel is connected on the lower velocity shaft, and the tooth of gearwheel has 12 °-18 ° helix angle, the facewidth of 80mm-100mm; It is the high speed radial-thrust bearing of 0.4-0.65 that the high speed shaft two ends connect width-diameter ratio, substitutes thrust disc; The sealing gland of high speed shaft is a plagiodont non-contact comb shaft envelope.

The spiral case of described step-up gear saves counter flange by the direct connect box of spiral case coupling flange, reduces the hron spacing of impeller, helps high speed shaft rotor safety, reliable operation under complex environment.

Also be furnished with oil pump gear on the described gear-box lower velocity shaft, power and rotating speed be delivered to lubricating pump, satisfy the lubricated and cooling of each lubricating point, saved running space by oil pump gear corresponding on the high speed shaft.

The tooth of described gearwheel has 15 °-17 ° helix angle, the facewidth of 85mm-95mm, with the pulling force of balance impeller, has reduced the load of high speed radial-thrust bearing, has reduced the facewidth simultaneously, further saves cost.

The broach height of described plagiodont non-contact comb shaft envelope is staggered, short level decompression, and broach just differs 3mm-7mm.

Beneficial effect: the utlity model has following advantage:

1) design of gears of gear-box has been selected big helix angle, increases gear-driven axial force, with the pulling force of balance impeller, has reduced the load of thrust bearing, has reduced the facewidth simultaneously, saves cost.

2) the high speed rotating shaft two ends have been designed thrust bearing and have been substituted thrust disc, have deducted the operation of match grinding thrust disc, to save cost and man-hour, for batch process provides efficient.

3) because different requirements of customers, the shaft-driven impeller material of high speed is respectively aluminum alloy impeller and stainless steel impeller, their weight differs 3 times nearly, when the utility model can guarantee to connect the impeller of Different Weight such as aluminum alloy impeller and stainless steel impeller all steadily, reliable operation.

4) high speed rotating shaft has adopted reliable non-contact labyrinth seal, has dwindled axial dimension, and easy to assembly; Spiral case directly is connected with the speedup box flange plate, has saved counter flange, to reduce the hron spacing of impeller, helps high speed rotating shaft safety, reliable operation under complex environment.

5) this speedup box has that transmitted power is big, bearing PV value high, rotating speed is high, belongs to heavily loaded high-speed gear box, compact overall structure, characteristics such as in light weight, cost is few, and sealing is reliable, and running is steady, and noise is low.

Description of drawings

Fig. 1 is a general assembly structural representation of the present utility model;

Fig. 2 is a structural representation that contains geared parts of the present utility model.

Among the figure: 1, spiral case coupling flange; 2, sealing gland; 3, high-speed oil seal; 4, the tooth of gearwheel; 5, low speed radial bearing; 6, lower velocity shaft; 7, gearwheel; 8, high speed radial-thrust bearing; 9, lubricated separate system; 10, high speed shaft; 11, oil pump link; 12, lubricating pump; 13, input lamination flexible coupling; 14, casing; 15, oil pump gear.

Embodiment

Select or make the following Component of suitable types and suitable quantity for use: spiral case coupling flange 1, sealing gland 2, high-speed oil seal 3, low speed radial bearing 5, lower velocity shaft 6, gearwheel 7, high speed radial-thrust bearing 8, lubricated separate system 9, high speed shaft 10, oil pump link 11, lubricating pump 12, input lamination flexible coupling 13, casing 14, oil pump gear 15 with tooth 4 of gearwheel.

By illustrated in figures 1 and 2, each component are coupled together.

Wherein, the tooth 4 of gearwheel has 15 ° helix angle, the facewidth of 80mm; Described sealing gland 2 is a plagiodont non-contact comb shaft envelope, and its broach height is staggered, and height differs 3mm.High speed shaft 10 two ends connection width-diameter ratio is 0.4 high speed radial-thrust bearing 8, substitutes thrust disc.The spiral case of described step-up gear directly is connected with speedup casing 14 by spiral case coupling flange 1, has saved counter flange, reduces the hron spacing of impeller.Be furnished with oil pump gear 15 on the described gear-box lower velocity shaft 6, by oil pump gear 15 on the high speed shaft 10 power and rotating speed be delivered to lubricating pump 12, satisfy the lubricated and cooling of each lubricating point, lubricating pump 12 connects by oil pump link 11.

When installing and using, high-voltage motor drives lower velocity shaft 6 rotations by input lamination flexible coupling 12, lower velocity shaft 6 and gearwheel 7 combine and assemble are together, lower velocity shaft 6 is supported by low speed radial bearing 5, bear the radial force of gear transmission, gearwheel 7 is given high speed shaft 10 with moment of torsion and transmission of movement under lower velocity shaft 6 drives, high speed shaft 10 is supported by two ends high speed radial-thrust bearing 8, the axial force of gear and the pulling force of impeller have consumed a part of axial force, still some axial force is born by high speed radial-thrust bearing 8, high speed shaft 10 and impeller are bound up, drives impeller is done work at a high speed, produce powerful air quantity, spiral case directly is bound up on the casing 14 by spiral case coupling flange 1, and the wind that impeller produces produces pressure by spiral case and derives and go.Lubricated separate system 9 arrives each lubricating point with the oily reasonable distribution of lubricating pump 12 outputs, ensures that each lubricating point has enough oil masses and pressure, thereby guarantees this model utility proper functioning.

Claims

1. an one-stage centrifugal blower fan step-up gear has the structure of conventional gear-box, it is characterized in that: gearwheel (7) is connected on the lower velocity shaft (6), and the tooth of gearwheel (4) has 12 °-18 ° helix angle, the facewidth of 80mm-100mm; It is the high speed radial-thrust bearing (8) of 0.4-0.65 that high speed shaft (10) two ends connect width-diameter ratio; The sealing gland (2) of high speed shaft (10) is a plagiodont non-contact comb shaft envelope.

2. one-stage centrifugal blower fan step-up gear according to claim 1 is characterized in that: the spiral case of described step-up gear saves counter flange by the direct connect box (14) of spiral case coupling flange (1), reduces the hron spacing of impeller.

3. one-stage centrifugal blower fan step-up gear according to claim 1, it is characterized in that: also be connected with oil pump gear (15) on the described gear-box lower velocity shaft (6), power and rotating speed be delivered to lubricating pump (12) by oil pump gear (15) corresponding on the high speed shaft.

4. according to claim 1,2 or 3 described one-stage centrifugal blower fan step-up gears, it is characterized in that: the tooth of described gearwheel (4) has 15 °-17 ° helix angle, the facewidth of 85mm-95mm.

5. one-stage centrifugal blower fan step-up gear according to claim 1 is characterized in that: the broach height of described plagiodont non-contact comb shaft envelope is staggered, and broach just differs 3mm-7mm.