CN103511468A - Magnetic fluid seal shaft with frictionless angle measurement function - Google Patents
Magnetic fluid seal shaft with frictionless angle measurement function Download PDFInfo
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- CN103511468A CN103511468A CN201310432013.1A CN201310432013A CN103511468A CN 103511468 A CN103511468 A CN 103511468A CN 201310432013 A CN201310432013 A CN 201310432013A CN 103511468 A CN103511468 A CN 103511468A
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- supporting cover
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Abstract
The invention discloses a magnetic fluid seal shaft with a frictionless angle measurement function, and relates to an angle test device of a shaft in a thermal vacuum test. The magnetic fluid seal shaft comprises a transmission shaft, two air flotation sleeves, a non-magnetic base and a magnetic core assembly, wherein the magnetic core assembly, the first air flotation sleeve and the second air flotation sleeve are sleeved on the transmission shaft in sequence from left to right; the transmission shaft is provided with an annular boss in a gap between the first air flotation sleeve and the second air flotation sleeve; an annular coding disc is mounted on the side surface of the annular boss; a blind hole is formed in the annular end surface of the second air flotation sleeve, close to the annular boss; a laser probe is arranged in the blind hole and is over against the annular coding disc. According to the magnetic fluid seal shaft, the magnetic core assembly is utilized for sealing; an air flotation bearing is utilized for supporting; exhaust holes are axially and uniformly formed in the two annular end surfaces of the first and second air flotation sleeves, close to the annular boss; a stable air film is formed between each air flotation sleeve and the annular boss, so that the influence on the measurement precision due to relative friction caused by direct contact between the annular boss and each air flotation sleeve is prevented.
Description
Technical field
The present invention relates to a kind of angle measurement device of thermal vacuum experiment lower shaft, relate in particular to a kind of magnet fluid sealing axle of measuring without rubbing angle that has.
Background technique
Thermal vacuum test refers to the test of checking performance and the function of measured piece under the vacuum of regulation and thermal cycle conditions.Thermal vacuum test not only needs there is the vacuum-simulating system that can simulate outer space vacuum environment, and need to have and can equipment be driven or be loaded with the suffered driving of simulation mechanism and load device, also to possess the ability of the information such as torque, corner and rotating speed of real-time high-precision measuring equipment simultaneously.
In measured piece being reversed to the thermal vacuum test loading, under hot vacuum environment, the reliability decrease of sensor, power equipment, shorten working life, is difficult to control in test process, and therefore often adopting the outer analog system of thermal vacuum is that vacuum tank is tested outward.The outer test of tank refers to the outside that transmits torque to vacuum tank by seal arrangement, and the test of torque is carried out outward at vacuum tank.
Loading as outer in tank and measuring device are fixedly tested by the motor output shaft to be measured in transmission shaft and tank, to analyze each characteristic of motor under hot vacuum environment, if also need to measure the no-load characteristic of motor, in test process, need motor output shaft and transmission shaft to throw off, this difficulty under hot vacuum environment is very large.If measured piece is coupling etc., need the outer loading of two-way shaft and tank and measuring device to be connected.
Thermal vacuum test system often adopts magnetic fluid seal driving device to be connected with measured piece in vacuum tank, rotary magnetic Fluid Sealing axle can meet assurance hot vacuum environment seal request on the one hand, also can realize on the other hand vacuum tank outer to the transmission of power in tank, if number of patent application is 200710068382.1, " magnetofluid seal driving device for vacuum equipment driving shaft " discloses and a kind ofly adopts that testing precision is high, the magnetic fluid seal driving device of good reliability.Number of patent application be 201010243123.X's " device for sealing magnetic fluid " a kind of magnetic sealing means is also disclosed; Because sensor measuring device is positioned at outside thermal vacuum analog system, this has become indirect measurement with regard to making to the measurement of measured piece information in thermal vacuum simulated environment, magnetic fluid seal driving device self friction power consumption is little, but magnet fluid sealing axle both sides need bearings to guarantee not deflect, if use bearings, the frictional force of bearing can produce impact greatly to torque measurement; Measured piece is fixedly linked by the loading outside magnetic fluid seal driving device and tank and measuring device, because measured piece can produce distortion under hot vacuum environment, and measured piece is fixed in tank, distortion can affect being connected of measured piece and magnet fluid sealing axle, make it connect axle center and change, produce the result of the impact tests such as deflection.
Summary of the invention
For the problems such as frictional influence of measured piece deformation in thermal vacuum torsion test and magnetic fluid seal driving device, the invention provides a kind of magnet fluid sealing axle of measuring without rubbing angle that has of eliminating under hot vacuum environment frictional force, that be not subject to measured piece deformation effect.
The technical solution adopted for the present invention to solve the technical problems is: a kind of magnet fluid sealing axle having without rubbing angle measurement, comprise transmission shaft, air supporting cover, nonmagnetic seat, core assembly, described air supporting cover comprises the first air supporting cover and the second air supporting cover, described core assembly, the first air supporting cover, the second air supporting cover is sleeved on transmission shaft from left to right successively, described core assembly and the first air supporting cover, the certain distance in interval between the first air supporting cover and the second air supporting cover, described nonmagnetic cover for seat is contained in the first air supporting cover, the second air supporting cover, on core assembly, described transmission shaft and the first air supporting cover, between the second air supporting cover, there is micro-gap, described nonmagnetic seat is provided with two radial air inlet holes, described radial air inlet hole is logical with the air-inlet cavity that two air supportings put respectively, the external thermal vacuum tank of described nonmagnetic seat left end, nonmagnetic seat is affixed with thermal vacuum tank, described nonmagnetic seat right-hand member is installed end cap, described nonmagnetic seat is positioned at the gap portion of core assembly and the first air supporting cover and the radially uniform bleeder port of gap portion of the first air supporting cover and the second air supporting cover,
The gap portion that described transmission shaft is positioned at the first air supporting cover and the second air supporting cover is provided with annular projection; Described annular projection is near affixed annular coding mask on the second air supporting Tao side; Between described the first air supporting cover and annular projection, the second air supporting cover and annular projection, there is micro-gap; Two annular end faces of described the first air supporting cover and the close annular projection of the second air supporting cover are along being axially uniformly distributed exhaust port; Described the second air supporting cover is provided with a blind hole near the annular end face of annular projection, is provided with a laser probe in blind hole, and laser probe is over against annular coding mask;
Described core assembly comprises two annular magnetic poles, permanent magnet, and described permanent magnet is between two annular magnetic poles, and the internal surface of described annular magnetic pole is provided with utmost point mark of mouth groove, between the micro-gap of described utmost point mark of mouth groove and transmission shaft, is provided with sealing magnetic fluid; Described nonmagnetic seat is provided with the filling hole of magnetic fluid;
Between described nonmagnetic seat and thermal vacuum tank, be provided with a 〇 RunddichtringO, between described two annular magnetic poles and nonmagnetic seat, be provided with and establish the 2nd 〇 RunddichtringO, between described first, second air supporting cover outer ring and nonmagnetic seat, the 3rd 〇 RunddichtringO is installed.
Mentality of designing of the present invention and advantage show: on transmission shaft, be set with core assembly and play sealing effect, but core assembly does not play a supportive role; On transmission shaft, be set with two air supporting covers, by the radial air inlet hole air feed on nonmagnetic seat, can on transmission shaft, form stable air film, two certain distances in air supporting cover interval, transmission shaft is formed to air supporting and support, prevent that transmission shaft from occurring crooked, due to air-floating apparatus frictionless advantage, avoid the impact of the frictional force of plain bearing on torque measurement, further improved testing precision.
Two annular end faces of the first air supporting cover and the close annular projection of the second air supporting cover are along being axially uniformly distributed exhaust port, between two air supporting covers and annular projection, form and stablize air film, prevent the precision that the relative frictional influence that directly contact causes of the gentle empty boasting of annular projection is measured.The effect of annular projection is to reduce friction and prevents the left and right play of transmission shaft.
Under the environment of thermal vacuum, workpiece is subject to high temperature easily to produce distortion, directly in the environment of thermal vacuum, measure and not only can affect the precision of measurement, can also destroy a whole set of measuring device, therefore we are placed on measuring tool outside thermal vacuum layer environment, pass through magnet fluid sealing, prevent the impact of high temperature on measuring device, utilize device for sealing magnetic fluid and seal ring that whole thermal vacuum tank is sealed, transmission shaft is connected by coupling with the output shaft of measured piece in thermal vacuum tank, by laser probe, read the reading on annular coding mask, measure the angle of axle.
Accompanying drawing explanation
Fig. 1 is the structural representation with the magnet fluid sealing axle of measuring without rubbing angle.
Embodiment
Now by reference to the accompanying drawings the present invention is further detailed.
By reference to the accompanying drawings 1, a kind of magnet fluid sealing axle having without rubbing angle measurement, comprise transmission shaft 1, air supporting cover, nonmagnetic seat 2 and core assembly, air supporting cover comprises first air supporting cover the 3 and second air supporting cover 4, core assembly, the first air supporting cover 3, the second air supporting cover 4 is sleeved on transmission shaft 1 from left to right successively, core assembly and the first air supporting cover 3, the certain distance in interval between first air supporting cover the 3 and second air supporting cover 4, nonmagnetic seat 2 is sleeved on the first air supporting cover 3, the second air supporting cover 4, on core assembly, nonmagnetic seat the 2 and first air supporting cover 3, the second air supporting cover 4, between core assembly, do not rotate.
Between transmission shaft 1 and the first air supporting cover the 3, second air supporting cover 4, there is micro-gap, after air inlet, between the first air supporting cover 3 and transmission shaft 1, the second air supporting cover 4 and transmission shaft 1, form stable air film, the certain distance in interval between first air supporting cover the 3 and second air supporting cover 4, transmission shaft 1 is played to the effect of support, core assembly only plays the effect of sealing, can not produce the effect of support.
Core assembly comprises two annular magnetic poles 5, permanent magnet 6, and permanent magnet 6 is between two annular magnetic poles 5, and the internal surface of two annular magnetic poles 5 is provided with utmost point mark of mouth groove, between the micro-gap of utmost point mark of mouth groove and transmission shaft 1, is provided with sealing magnetic fluid; Nonmagnetic seat 2 is provided with the filling hole of magnetic fluid.
Between nonmagnetic seat 2 and thermal vacuum tank, be provided with a 〇 RunddichtringO, between two annular magnetic poles 5 and nonmagnetic seat 2, be provided with and establish the 2nd 〇 RunddichtringO, between first, second air supporting cover outer ring and nonmagnetic seat 2, the 3rd 〇 RunddichtringO is installed.
Outer loading equipemtn is installed on the right side of transmission shaft 1, left side connects the measured piece output shaft in thermal vacuum tank through thermal vacuum tank skin, when installing, first nonmagnetic seat 2 use bolts are arranged on thermal vacuum tank skin, load onto successively core assembly, the first air supporting cover 3, transmission shaft 1, the second air supporting cover 4, end cap 11.The installation of the measured piece in thermal vacuum tank and measured piece output shaft and transmission shaft is carried out at normal temperatures.After whole device is installed, utilize nonmagnetic seat 2 to be provided with the filling hole of magnetic fluid by between the micro-gap of magnetic fluid injector mark of mouth groove and transmission shaft, utilize nonmagnetic seat 2 to be provided with two radial air inlet holes 8 and overlap 4 air feed to first air supporting cover the 3 and second air supporting, be contained in the outer loading device start on transmission shaft 1 right side, after whole unit normal run, laser probe 10 reads out the scale on annular coding mask 9, utilize wire by the data importing equipment of laser probe 10, can complete the measurement to angle.
Claims (1)
1. one kind has the magnet fluid sealing axle of measuring without rubbing angle, comprise transmission shaft, air supporting cover, nonmagnetic seat, core assembly, it is characterized in that: described air supporting cover comprises the first air supporting cover and the second air supporting cover, described core assembly, the first air supporting cover, the second air supporting cover is sleeved on transmission shaft from left to right successively, described core assembly and the first air supporting cover, the certain distance in interval between the first air supporting cover and the second air supporting cover, described nonmagnetic cover for seat is contained in the first air supporting cover, the second air supporting cover, on core assembly, described transmission shaft and the first air supporting cover, between the second air supporting cover, there is micro-gap, described nonmagnetic seat is provided with two radial air inlet holes, described radial air inlet hole is logical with the air-inlet cavity that two air supportings put respectively, the external thermal vacuum tank of described nonmagnetic seat left end, nonmagnetic seat is affixed with thermal vacuum tank, described nonmagnetic seat right-hand member is installed end cap, described nonmagnetic seat is positioned at the gap portion of core assembly and the first air supporting cover and the radially uniform bleeder port of gap portion of the first air supporting cover and the second air supporting cover,
The gap portion that described transmission shaft is positioned at the first air supporting cover and the second air supporting cover is provided with annular projection; Described annular projection is near affixed annular coding mask on the second air supporting Tao side; Between described the first air supporting cover and annular projection, the second air supporting cover and annular projection, there is micro-gap; Two annular end faces of described the first air supporting cover and the close annular projection of the second air supporting cover are along being axially uniformly distributed exhaust port; Described the second air supporting cover is provided with a blind hole near the annular end face of annular projection, is provided with a laser probe in blind hole, and laser probe is over against annular coding mask;
Described core assembly comprises two annular magnetic poles, permanent magnet, and described permanent magnet is between two annular magnetic poles, and the internal surface of described annular magnetic pole is provided with utmost point mark of mouth groove, between the micro-gap of described utmost point mark of mouth groove and transmission shaft, is provided with sealing magnetic fluid; Described nonmagnetic seat is provided with the filling hole of magnetic fluid;
Between described nonmagnetic seat and thermal vacuum tank, be provided with a 〇 RunddichtringO, between described two annular magnetic poles and nonmagnetic seat, be provided with and establish the 2nd 〇 RunddichtringO, between described first, second air supporting cover outer ring and nonmagnetic seat, the 3rd 〇 RunddichtringO is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432013.1A CN103511468B (en) | 2013-09-18 | 2013-09-18 | A kind of have the magnet fluid sealing axle measured without rubbing angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310432013.1A CN103511468B (en) | 2013-09-18 | 2013-09-18 | A kind of have the magnet fluid sealing axle measured without rubbing angle |
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| Publication Number | Publication Date |
|---|---|
| CN103511468A true CN103511468A (en) | 2014-01-15 |
| CN103511468B CN103511468B (en) | 2015-12-23 |
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| CN201310432013.1A Active CN103511468B (en) | 2013-09-18 | 2013-09-18 | A kind of have the magnet fluid sealing axle measured without rubbing angle |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| KR100906072B1 (en) * | 2008-06-11 | 2009-07-03 | 박광준 | Magnetic fluid sealing member and vacuum sealing device including the same |
| CN102345626A (en) * | 2010-07-28 | 2012-02-08 | 龚祺允 | Magnetic fluid sealing device |
| CN203560308U (en) * | 2013-09-18 | 2014-04-23 | 浙江工业大学 | Magnetic fluid seal shaft with frictionless angle measurement |
-
2013
- 2013-09-18 CN CN201310432013.1A patent/CN103511468B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| KR100906072B1 (en) * | 2008-06-11 | 2009-07-03 | 박광준 | Magnetic fluid sealing member and vacuum sealing device including the same |
| CN102345626A (en) * | 2010-07-28 | 2012-02-08 | 龚祺允 | Magnetic fluid sealing device |
| CN203560308U (en) * | 2013-09-18 | 2014-04-23 | 浙江工业大学 | Magnetic fluid seal shaft with frictionless angle measurement |
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| Publication number | Publication date |
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| CN103511468B (en) | 2015-12-23 |
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Effective date of registration: 20181220 Address after: 401120 Guanyan Village, Lianglu Road, Yubei District, Chongqing (9 second and third floors of Lianglu Industrial Park) Patentee after: Chongqing Nandi Spark Plug Manufacturing Co., Ltd. Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui District Six Patentee before: Zhejiang University of Technology |
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