When sensor of displacement of electric vortex flow is being used to measure equipment in industrial production, because be short time,measure temporarily, because this often won’t notice the correct installation of sensor of displacement of electric vortex flow, cause remarkable test error, to vibration breakdown is diagnosed and the shafting brings a trouble evenly. To raise the validity that equipment vibration checks and dependability. Shen Sai is measured below accuse small the correct installation method that invents sensor of displacement of vortex flow of the cable below the introduction and point.

 

 

 

The bracket of sensor is measuring Zhen Pin to lead must the frequency of the correspondence of top rotate speed of prep above equipment, can make because of bracket resonance measure an outcome otherwise lack fidelity. Bracket of sensor of displacement of vortex flow of cable of provision of American CTC plant is being measured brace up of direction answer from Zhen Pin rate prep above machine the top job frequency of 10 times, this often are achieved hard in be operated actually, general support is measured brace up direction leads prep above 2~3 from Zhen Pin the frequency of rotate speed job of times can be satisfied basically measure brace up requirement.

 

To rise to be led from Zhen Pin, structural support is to use the flat steeliness with thick 6~8mm to become commonly, its cantilever length should not exceed 100mm; to become when cantilever is longer, should use profiled bar, for example angle iron, I-steel, so that increase support effectively,lead from Zhen Pin. In the test become loose to prevent bracket or sensor of displacement of electric vortex flow to happen, bracket must originally closely to go up in the part propping up with good stability, best and fixed in plain bearing liner or bearing go up, the join of sensor of displacement of electric vortex flow and bracket should use the tap on bracket, reoccupy nut screw, do not use the stiletto on bracket to use double nut screw.

 

 

When the sensor of displacement of electric vortex flow of two perpendicular or parallel installation is stood by each other, alternate response produces between them, can make sensor output sensitivity is reduced. To avoid alternate induction, what two sensor cannot lean is too close. To the sensor of displacement of electric vortex flow of different type, ask the numerical value that is apart from between two sensor is different. Too little side direction space basically is sensor head conductor of two side existence, make sensor output sensitivity is reduced apparently. B of correct side direction clearance should is more than or be equal to D (diameter of sensor coping coil) . Measure should consider cold conditions not only to clearance, after considering air cylinder and rotor be heated even expand change. Sensor head appears high C, do not have specific provision commonly, but use according to the spot, c is too small also can make sensor sensitivity is reduced significantly.

 

 

Sensor of all sorts of displacement of model cable vortex flow should be in constant clearance tension (sensor coping and the clearance between the object that be measured, general voltage is indicated on appearance) below the value, its reading just has finer line to spend, must have adjusted suitable initiative space when installing sensor of displacement of electric vortex flow so. Cheng cannot be more than the static maximum of electric report vortex flow sensor 2.5mm, trends issues better to obtain degree of linearity, its work space should be inside 0.3~2.8mm limits, namely voltage of clearance of appearance place directive is 2~16V.

 

 

After rotor rotates to take negative charge with equipment, rotor photograph will produce displacement to sensor. If install sensor of displacement of electric vortex flow in bearing coping, if install,its clearance will reduce; direction is made the same score in bearing water, its clearance depends on; of rotor direction of rotation times when direction of rotation, its clearance depends on installation is in on the right side of left still. To obtain suitable working space to be worth, estimation rotor answers to arrive from the static state when be being installed working rotate speed, journal drive up carries way of unoccupied place 1/2; standard on the head for plain bearing liner about displacement and form of plain bearing liner, plain bearing liner two side clearance and aircrew are slippery sell 0.20mm. Sensor installation is in on the right side of horizontal position, after rotor rotates, clearance C increases; outfit to be in left, d is reduced.

 

Journal produces displacement to divide inside plain bearing liner outside be being concerned with rotate speed, still concern with bear of installation have rendered great service. To the rotor of turbine high pressure with lesser quality and the runner shaft that take reducer, pitching moment action is delivered to fall into steam and gear in the part, can push journal vertebra to a side of plain bearing liner, its displacement value receives the diametical clearance that is bordering on plain bearing liner likely. Adjusting sensor when initiative clearance, went out to want a consideration afore-mentioned outside these elements, consider the greatest oscillatory value and rotor even primitive shake place a value. Initiative clearance should be more than sensor the biggest amplitude that runner shaft agrees to be able to happen and runner shaft are primitive shake 1/2 what place a value.

 

 

From measure an axis brace up for the requirement, axis brace up measure a dot to answer as far as possible stand by place of center of plain bearing liner, but the restriction that often accepts sensor of displacement of vortex flow of electric eddy cable to install the position, must maintain certain distance with plain bearing liner sometimes. By spot vibration the test is reached, measure along with the axis brace up the accretion that the dot is apart from plain bearing liner to be apart from, axial amplitude value will increase. The axis is measured brace up the treatment precision that what dot axial position should consider additionally is runner shaft changing a spot and runner shaft surface guide magnetism is even. Before be being installed formally commonly, had better use dial gauge to detect this a little bit shake place a value.

 

If shake,place a value to be more than 50u;m, should choose additionally measure a place, because of,meet otherwise low speed lower shaft brace up shake place a value too big, make high speed lower shaft brace up indication value appears not to realize an elephant. Runner shaft surface guides magnetism is inhomogenous, use naked eye to cannot be judged directly, be in only expedited runner shaft to shake placing a value is by its outside machinery shakes greatly too after placing what cause greatly, vibration of the runner shaft below certain low speed shakes ability been place is guided by runner shaft surface magnetism all is not caused greatly, remove this kind of trouble, choose the place that measure a place additionally only.

 

 

Press the demand of ISO DIS7919/2 standard, axial Zhen Zhen moves the installation of sensor to should satisfy two bearing sensor to lie on an axial plane, and mutual and perpendicular.