CN102563084B - Bypass air sealing structure - Google Patents
Bypass air sealing structure Download PDFInfo
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- CN102563084B CN102563084B CN201110382719.2A CN201110382719A CN102563084B CN 102563084 B CN102563084 B CN 102563084B CN 201110382719 A CN201110382719 A CN 201110382719A CN 102563084 B CN102563084 B CN 102563084B
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Abstract
The invention relates to a bypass air sealing structure, which overcomes the defects that greases in bearings are easily squeezed out and working conditions are deteriorated as an existing air sealing structure has positive-pressure airflow sprayed out of a gap. The bypass air sealing structure comprises a rotary shaft, a fixing seat and a flange, wherein the fixing seat is connected with the rotary shaft through the bearings, and the flange is fixed onto the fixing seat. A straight channel axially communicated with the flange is arranged on the flange, a through hole axially communicated with the channel is arranged on the fixing seat, the channel is communicated with a gap between the rotary shaft and the flange through a branch, a reducer pipe is arranged at the intersection of the channel and the branch, and airflow enters the channel from one end of the channel communicated with the through hole, and is sprayed out of the other end of the channel. The compressed airflow flows through the channel, so that positive pressure is generated on the branch, and impurities entering from the gap are sucked to the channel and are sprayed out of an outlet of the channel along with the airflow. The impurities cannot intrude into the bearings under the action of the factors of dead weight and differential pressure, the compressed airflow is prevented from eroding the bearings, and the working environment of the bearings is prevented from being deteriorated.
Description
Technical field
The present invention relates to a kind of sealing configuration, contaminated bypass air sealing structure is exempted to protect bearing in especially a kind of negative pressure dredging gap that adopts.
Background technique
In machining industry, be equipped with flange outside rotating shaft, be connected between rotating shaft with flange by bearing, rotating shaft is at High Rotation Speed, and flange is in stationary state, and the inner ring of bearing is with rotating shaft synchronous rotary, and outer ring and the flange of bearing fix.There is gap between rotating shaft and flange, there is again pulverous dust or chip, add man-hour in processing district, these impurity to enter in the gap between rotating shaft and flange and to invade in bearing, cause bearing impaired, equipment cisco unity malfunction.Especially cutting on line industry, mortar, in continuous splashing, easilier to invade from gap.
Therefore between rotating shaft and flange, need to arrange seal arrangement prevents the liquid outside rotating shaft or above-mentioned impurity from entering, common sealing means is by two kinds, one is use contact seal material pay the seam, impurity must not be entered, material has various wear-resistant seal circle or felt, but but there is friction, wearing and tearing and heat may be produced, be not suitable for using in high speed, major diameter rotate.Two is adopt pressurized air to spray from gap, namely in gap, there is positive pressure air stream, stop that impurity enters gap, this sealing means does not almost have the friction between rotating shaft and sealing medium and heating to produce, just consume a small amount of pressurized air, be thus widely used in high speed, major diameter rotating environment.
Such as, Patent Office of the People's Republic of China has announced a CN101478190B patent on July 27th, 2011, name is called the air-tight structure design method of electric main shaft of oil grease mill, the air of certain pressure is entered in the annular chamber between baffle plate and front tegillum by the air flue that front-end bearing pedestal is arranged, annular groove is arrived again by radial inclined hole, baffle plate inner circle and front nut cylindrical have gap, front nut designs has saw-tooth grooves corresponding with another annular groove of baffle plate, along with the High Rotation Speed of rotating shaft, pressure air is the airtight seal ring of mineralization pressure in gap and two grooves, stop that cooling liquid and impurity enter rotating shaft.
But adopt positive pressure air stream as sealing, air-flow, except from except the blowout of gap, also enters in the space of bearing from gap, and blow out from this space, the steam of air-flow like this also can invade in bearing, squeezes the grease in bearing on the one hand, can make the degrading of bearing on the other hand.
Summary of the invention
The invention solves existing air-tight structure adopts malleation air-flow to spray from gap, easily make the grease in bearing be squeezed, degrading defect, provide a kind of bypass air sealing structure, adopt negative pressure, air-flow outwards can not blow out from the inboard of bearing, ensure that the grease in bearing stores, also can not worsen the operating mode of bearing.
The technical solution adopted for the present invention to solve the technical problems is: a kind of bypass air sealing structure, the fixed base comprise rotating shaft, being connected by bearing with rotating shaft and the flange be fixed on fixed base, flange is provided with the straight passage that axial direction is communicated with flange, fixed base is provided with the through hole of axial communicating passage, this passage is communicated with the gap between rotating shaft and flange by branch road, passage is provided with reducer pipe with the intersection of branch road, air-flow enters from one end of through hole, sprays from the other end of passage.Logical compressed air stream in passage, passage is straight passage, and reducer pipe is set in passage, airflow passes reducer pipe, cross section reduces gradually, and the flow velocity of air-flow improves gradually, when high velocity air process, branch road place produces negative pressure, and the impurity entered in gap is drawn into branch road and enters into along with air-flow in passage and from the outlet of passage and sprays by this negative pressure; So this compressed air stream and enter air-flow impure in gap and would not enter in bearing, thus make bearing be in normal working environment, bearing both can not be compressed the erosion of air-flow, also can not by the erosion containing impurity air-flow entered in gap, grease in bearing can not be squeezed by air-flow, ensures the working life of bearing.
As preferably, reducer pipe is middle narrow meshed nozzle, and nozzle cross-section is T-shaped, and flange is provided with the shoulder hole with channel coaxial, nozzle is embedded in shoulder hole, and the miner diameter end of nozzle is in the position that crosses of passage and branch road.This is a kind of scheme, and air-flow is through the aperture of nozzle, and the diameter flowed through diminishes, and the flow velocity of air-flow increases, and improves the negative-pressure adsorption ability of branch road, reduces the impurity storage in gap, improves impurity cleaning ability, protection bearing; Nozzle is embedded into shoulder hole, installs more convenient, is sealing, can arranges seal ring between nozzle and the end face of fixed base.
As preferably, the entrance of nozzle is the horn mouth that diameter reduces gradually, and bell-mouthed bigger diameter end is towards air-flow approach axis, and the outlet of nozzle is the horn mouth that diameter increases, and bell-mouthed bigger diameter end is towards air-flow emission direction.The aperture of through hole and nozzle, by horn mouth transition, reduces airflow strikes, and improves air-flow velocity gradually, sprayed after small holes by horn mouth, improves the negative-pressure adsorption ability of branch road.
As preferably, reducer pipe is oviduct, and the bigger diameter end of oviduct is connected with straight tube, and miner diameter end is towards the emission direction of air-flow, and straight tube is connected in the through hole of fixed base, and oviduct is in the connection part of passage and branch road.This is another kind of scheme, and reducer pipe and straight tube are structure as a whole, and is so directly inserted from through hole by straight tube, oviduct is just in time in the intersection of passage and branch road, airflow passes straight tube is also sprayed by the path mouth of oviduct, improves air-flow velocity, improves the negative-pressure adsorption ability of branch road.
As preferably, the axis of passage and through hole is skewed, and the air-flow entry port of through hole is higher than the air-flow ejiction opening of passage.Channel slopes, is subject to the effect of gravity by the impurity that negative pressure is drawn in passage, be also subject to the thrust of air-flow simultaneously, conveniently sprays in passage.
As preferably, the joint between gap and branch road is provided with circular groove, and the radial width of circular groove is greater than the width in gap.Circular groove can as the collection point of impurity, and impurity passes into after circular groove is turned from gap and is inhaled into branch road, improves the mobility of impurity.
As preferably, the external diameter of this circular groove is greater than the external diameter of place, gap annulus, and the internal diameter of this circular groove is less than the internal diameter of the annulus at place, gap.
The invention has the beneficial effects as follows: compressed air stream flows through passage, make branch road produces negative pressure, the impurity entered from gap is drawn onto passage place and sprays with the outlet of air-flow from passage; Deadweight and pressure reduction factor under, impurity would not invade in bearing, also prevent compressed air stream to the erosion of bearing simultaneously, prevent the working environment of bearing from worsening, thus extend the working life of rotating shaft, especially, when rotating shaft working environment exists mortar, rotating shaft can work with maintaining a long-term stability.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the second structural representation of the present invention;
Fig. 3 is the third structural representation of the present invention;
In figure: 1, rotating shaft, 2, bearing, 3, flange, 4, passage, 5, branch road, 6, gap, 7, fixed base, 8, through hole, 9, circular groove, 10, nozzle, 11, horn mouth, 12, aperture, 13, seal ring, 14, shoulder hole, 15, straight tube, 16, oviduct.
Embodiment
Below by specific embodiment, and by reference to the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment 1: a kind of bypass air sealing structure (see accompanying drawing 1), the periphery of rotating shaft 1 is equipped with flange 3, leaves gap 6 between flange and the cylindrical of rotating shaft, is connected between rotating shaft with flange by bearing 2, and bearings is on fixed base 7.Flange is provided with axial straight passage 4, this passage parallels with gap, is also provided with the branch road 5 being communicated with gap and passage in flange.Turning point between branch road and gap is provided with circular groove 9, and the external diameter of circular groove is greater than the external diameter of place, gap annulus, and the internal diameter of circular groove is less than the internal diameter of the annulus at place, gap.Fixed base is provided with through hole 8, through hole and channel coaxial.Passage is provided with shoulder hole 14 towards one end of fixed base, shoulder hole is embedded in the nozzle 10 of the Intermediate Gray aperture 12 of T-shaped, be provided with seal ring 13 between the end face of the bigger diameter end of nozzle and the side of fixed base, the miner diameter end of nozzle is in the position that crosses of passage and branch road.The entrance of nozzle is the horn mouth 11 that diameter reduces gradually, and bell-mouthed bigger diameter end is towards air-flow approach axis, and the outlet of nozzle is the horn mouth that diameter increases, and bell-mouthed bigger diameter end is towards air-flow emission direction.Pressurized gas enters from the entrance of the through hole of fixed base, and the aperture in the middle of nozzle, sprays from the outlet end of passage.Airflow passes aperture place, flow velocity increases, and branch road produces negative pressure.
In rotating shaft high speed rotational operation, impurity especially mortar and liquid all can in branch road negative pressure effect under, enter into along gap between rotating shaft and flange, and enter under the multiple action of gravity, centrifugal force and negative pressure in branch road, and to be mixed in pressurized gas and to spray from channel outlet thereupon simultaneously, impurity like this and air can not enter in bearing, can not corrode bearing, also can not squeeze the grease in bearing.
Embodiment 2: a kind of bypass air sealing structure (see accompanying drawing 2), the periphery of rotating shaft 1 is equipped with flange 3, leaves gap 6 between flange and the cylindrical of rotating shaft, and flange and fixed base 7 fix, a structure of an essay for fixed base and rotating shaft has bearing 2, and one end towards roller end, gap is closed by bearing.Flange is provided with axial straight passage 4, fixed base is provided with through hole 8, through hole and channel coaxial, passage parallels with gap, is also provided with the branch road 5 being communicated with gap and passage in rotating shaft flange.Turning point between branch road and gap is provided with circular groove 9, and the external diameter of circular groove is greater than the external diameter of place, gap annulus, and the internal diameter of circular groove is less than the internal diameter of the annulus at place, gap.Be inserted with straight tube 15 in through hole, the end of straight tube is oviduct 16, and the osculum of oviduct is in the intersection of branch road and passage.Bearing is in the outer end of rotating shaft, and the entrance in gap is towards the medium position of rotating shaft.
In rotating shaft high speed rotational operation, impurity especially mortar and liquid all can enter between rotating shaft and flange along gap, can stop at circular groove place, logical pressurized gas in passage, owing to being straight passage, pressurized gas directly sprays from the other end of passage, and the gas on branch road has been taken away in centre, thus making branch road define negative pressure, the impurity in gap and the impurity in circular groove receive and spray with pressurized gas simultaneously by this negative pressure and centrifugal force and gravity.Impurity like this and air can not enter in bearing, can not corrode bearing, also can not squeeze the grease in bearing.Thus play the effect of hermetic seal.
Embodiment 3: a kind of bypass air sealing structure (see accompanying drawing 3), the periphery of rotating shaft 1 is equipped with flange 3, leaves gap 6 between farad and the cylindrical of rotating shaft, and flange fixed base 7 fixes, a structure of an essay for fixed base and flange has bearing 2, and one end towards roller end, gap is closed by bearing.Flange is provided with axial straight passage 4, fixed base is provided with through hole 8, through hole and channel coaxial, passage parallels with gap, is also provided with the branch road 5 being communicated with gap and passage in rotating shaft flange.Turning point between branch road and gap is provided with circular groove 9, and the external diameter of circular groove is greater than the external diameter of place, gap annulus, and the internal diameter of circular groove is less than the internal diameter of the annulus at place, gap.Be inserted with straight tube 15 in through hole, the end of straight tube is oviduct 16, and the osculum of oviduct is in the intersection of branch road and passage.Axis and the gap of passage and through hole tilt, and the entrance of through hole is higher than the outlet of passage.Bearing is in the outer end of rotating shaft, and the entrance in gap is towards the medium position of rotating shaft.
In rotating shaft high speed rotational operation, impurity especially mortar and liquid all can enter between rotating shaft and flange along gap, can stop at circular groove place, logical pressurized gas in passage, owing to being straight passage, pressurized gas directly sprays from the other end of passage, and the gas on branch road has been taken away in centre, thus making branch road define negative pressure, the impurity in gap and the impurity in circular groove receive and spray with pressurized gas simultaneously by this negative pressure.Oviduct make air-flow by time flow velocity strengthen, thus improve the effect received of negative pressure, impurity is received to branch road more thorough from gap.Also be subject to the forward active force of air-flow, the effect that impurity sprays from channel outlet is more desirable simultaneously.Impurity like this and air can not enter in bearing, can not corrode bearing, also can not squeeze the grease in bearing.Play the effect of hermetic seal simultaneously.
Above-described embodiment is several preferred version of the present invention, not does any pro forma restriction to the present invention, also has other variant and remodeling under the prerequisite not exceeding the technological scheme described in claim.
Claims (5)
1. a bypass air sealing structure, the fixed base (7) comprise rotating shaft (1), being connected by bearing (2) with rotating shaft and the flange (3) be fixed on fixed base, it is characterized in that the straight passage (4) flange being provided with axial direction connection flange, fixed base is provided with the through hole (8) of axial communicating passage, this passage is communicated with the gap (6) between rotating shaft and flange by branch road (5), passage is provided with reducer pipe with the intersection of branch road, air-flow enters from one end of through hole, sprays from the other end of passage; Reducer pipe is middle narrow meshed nozzle, and nozzle cross-section is T-shaped, and flange is provided with the shoulder hole with channel coaxial, nozzle is embedded in shoulder hole, and the miner diameter end of nozzle is in the position that crosses of passage and branch road; Or reducer pipe is oviduct (16), the bigger diameter end of oviduct is connected with straight tube (15), and miner diameter end is towards the emission direction of air-flow, and straight tube is connected in the through hole of fixed base, and oviduct is in the connection part of passage and branch road.
2. bypass air sealing structure according to claim 1, it is characterized in that the entrance of nozzle is the horn mouth that diameter reduces gradually, bell-mouthed bigger diameter end is towards air-flow approach axis, and the outlet of nozzle is the horn mouth that diameter increases, and bell-mouthed bigger diameter end is towards air-flow emission direction.
3. bypass air sealing structure according to claim 1, is characterized in that the axis of passage and through hole is skewed, and the air-flow entry port of through hole is higher than the air-flow ejiction opening of passage.
4. the bypass air sealing structure according to claim 1 or 2 or 3, it is characterized in that the joint between gap and branch road is provided with circular groove (9), the radial width of circular groove is greater than the width in gap.
5. bypass air sealing structure according to claim 4, is characterized in that the external diameter of this circular groove is greater than the external diameter of place, gap annulus, and the internal diameter of this circular groove is less than the internal diameter of the annulus at place, gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110382719.2A CN102563084B (en) | 2011-11-25 | 2011-11-25 | Bypass air sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110382719.2A CN102563084B (en) | 2011-11-25 | 2011-11-25 | Bypass air sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102563084A CN102563084A (en) | 2012-07-11 |
| CN102563084B true CN102563084B (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110382719.2A Expired - Fee Related CN102563084B (en) | 2011-11-25 | 2011-11-25 | Bypass air sealing structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109624116A (en) * | 2019-01-04 | 2019-04-16 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Gauze oscillation system and multi-wire saw equipment |
| CN112337637A (en) * | 2019-08-07 | 2021-02-09 | 赣州力信达冶金科技有限公司 | Method for preventing material from being coarse after being pulverized by airflow |
| CN114770777B (en) * | 2022-04-24 | 2024-04-09 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Swing mechanism with gas fluid sealing structure and multi-wire saw |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6267374A (en) * | 1985-09-19 | 1987-03-27 | Mitsubishi Heavy Ind Ltd | Non-contact type shaft sealing device |
| CN201027986Y (en) * | 2007-02-09 | 2008-02-27 | 北京精雕科技有限公司 | Helical seal device at end of electric principal shaft |
| CN201090743Y (en) * | 2007-09-01 | 2008-07-23 | 江苏科行环境工程技术有限公司 | Air separator pneumatic sealing device |
| CN101216111A (en) * | 2008-01-04 | 2008-07-09 | 洛阳轴研科技股份有限公司 | Method for implementing bearing hermetic sealing for machining inner screw thread copper pipe |
| CN201330851Y (en) * | 2008-12-30 | 2009-10-21 | 洛阳轴研科技股份有限公司 | Air sealing structure of electric main shaft |
| CN201394575Y (en) * | 2009-04-27 | 2010-02-03 | 薛建刚 | High speed wire rod rolling mill shaft head position air or oil gas sealing device |
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- 2011-11-25 CN CN201110382719.2A patent/CN102563084B/en not_active Expired - Fee Related
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| CN102563084A (en) | 2012-07-11 |
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Granted publication date: 20150318 Termination date: 20201125 |