United States or Pakistan ? Vote for the TOP Country of the Week !
This attachment makes it easy to adjust the distance between the rotor and the steam ports, and also concentrates all end thrust on to a point, thereby minimizing friction. The stirrup can be fashioned in a few minutes out of brass strip. Drill the holes for the holding-on screws; drill and tap a hole for the adjusting screw; insert the screw and centre it correctly on the spindle point.
I found out what that conical thing is, by the way. It's a wind-rotor, and under it there's an electric generator. This building generated its own power." "What sort of condition are the generators in?" Penrose asked. "Well, everything's full of dust that blew in under the rotor, of course, but it looks to be in pretty good shape. Hey, I'll bet that's it!
After a touch has been obtained on the top, bottom, and both sides, the total radial blade clearance will be known to equal the thickness of the liners transferred. The position of the rotor is then so adjusted that the radial blade clearance is equalized when the turbine is at operating temperature.
The matter is really worth a thorough investigation. This is a plan view showing the rotor resting in position in the lower half of its casing. Steam enters the cylinder through the passage E. Turning in the direction of the bearing A, it passes through alternate stationary and revolving rows of blades, finally emerging at F and going out by way of G to the condenser or to atmosphere.
Cut out along the lines, and twist the vanes to make an angle of about 60 degree with the central part, and bend the ends slightly backward away from the direction in which the rotor will revolve. Bore a hole in the centre to make a tight fit with the spindle, and place the rotor in position, with piece B in contact on the C side.
The upper screw S is set so that when the rotor exerts a light pressure against it through the thrust block and lever the grooves in the balance pistons are just unable to come in contact with the dummy strips in the cylinder. The lower screw S is then adjusted to permit about 0.008 to 0.010 of an inch freedom for the collar between the grooves of the thrust bearing.
As the expansion proceeds, the passages are made larger by increasing the length of the blades and the diameter of the drums upon which they are carried in order to accommodate the increasing volume. The pressure acting upon the exposed faces of the rows of vanes would crowd the rotor to the left.
The turbo-generator, which constitutes the electrical end of this unit, is totally enclosed to provide for noiseless operation, and forced ventilation is secured by means of a small fan carried by the shaft on each end of the rotor.
The same pressure is maintained in B^1 as in B, and in C^1 as in C by connecting them with equalizing pipes E E. The third equalizing pipe connects the back or right-hand side of the largest dummy with the exhaust passage so that the same pressure exists upon it as exists upon the exhaust end of the rotor.
To secure the first two of these factors the wire should be formed of a number of fine, pure copper wires each of which is insulated and the whole strand then covered with silk. This kind of wire is the best that has yet been devised for the purpose and is sold under the trade name of litzendraht. A new type of variometer has what is known as a basket weave, or wavy wound stator and rotor.
Word Of The Day