SU48701A1 - Centrifugal Speed Relay - Google Patents

Description

The proposed centrifugal speed relay is of the type of such relays in which centrifugal weights, which are longitudinally displaceable on radially mounted rods of the rotatable part, are assigned to interact at a certain speed with the rotary contact part.

In the proposed relay, in order to increase the accuracy of the relay when it is used as a reverse current relay for electric motors, the parts of the rotatable contact part that interact with the weights are made movable and loaded with springs, so commensurate with respect to the resistance moments and inertia of the contact parts, so that the duration of coupling of the loads with the mentioned parts at high speeds was not sufficient for turning the contact part, but reached the required low speeds.

In the schematic drawing of FIG. 1 shows a partial longitudinal section of the proposed relay; and FIG. 2 is a section along line AB in FIG. one.

The proposed relay can be used as a reverse current relay when braking asynchronous short-circuited motors with a counter current.

Rel.e can be used for reversible and non-reversible engines in order to shut down the engine at speeds close to zero.

. The relay consists of the following parts: 7-bolt, screwed into the motor shaft 20; A 2-rod screwed into the bolt head /, the rod 2 having a rectangular cross-section and provided with a thread at both ends; 5 cylindrical weight with rectangular opening, mounted on rod 2; 4-screw to adjust the pressure of the spring 5; 5-spring, pressing the load 5 to the bolt head /; 6-massive ring, loosely mounted on the roller / 2; ring 6 has four cylindrical cavities located circumferentially and threaded on one side; the diameter of the outlet from the opposite side is somewhat narrowed; the ball in the cylindrical cavity of the ring 6, the ball 7 freely enters the cylindrical cavity on the thread side and cannot pass on the opposite side, since its diameter is larger than the diameter of the said outlet opening; An 8-spring pushing ball 7 into the outlet of the cylindrical cavity; 9-screw, which regulates the pressing of the spring U on the ball 7 Yu-screw, welded to the ring 5; // - nuts serving dp adjusting the flywheel

lf

a ment of the ring b and for displacing the center of gravity relative to the axis

m rotation; / 2-roller, which is loosely mounted ring 6; (5) rack to which the roller / 2 is attached; W cylinder of insulating mass, rigidly connected to ring 6; 15-pin conductive springs; a strut of iztionary material, on which contact springs / 5 are fixed; 17-conductive flat lamella mounted on insulating cylinder 14; 18 and 19 protective casing ;. 20-shaft protected engine.

The relay works as follows. The bolt 7, as stated, is screwed into the engine shaft and rotates with the latter. At rated engine speed, the loads 3 are consumed due to the centrifugal force, so that their lower edges lie higher than the balls 7 of the ring 6.

The ring 6 is mounted loosely on the roller 12 and tends to occupy a certain position corresponding to the lowest center position by means of nuts //

In this position, the contact springs 15 are connected electrically by a lamella 77. It should be borne in mind that there are two separate pairs of springs for forward and reverse.

The ring 6 and the bolt 7 are so positioned that in the lower position of the weights 5 the balls 7 touch the balls and tend to drag the ring 6 behind them. With considerable resistance to rotation, the balls 7 are pressed into the ring 5, and the last remains stationary.

With a small moment of resistance, the ring 6 is entrained with weights 3 and rotates synchronously with it.

At rated engine speed, the load 3 is consumed by the engine and there is no interaction between bolt 7 and ring 6.

When braking the engine and reducing its speed, the loads 5 under the action of the springs 5 are pressed to the head of the bolt 7. At the same time, as the bolt rotates, they periodically touch the balls 7.

With a high engine speed, the torque required to communicate the corresponding acceleration to ring 6 must be large.

As a result, the balls 7 are pressed into the ring 6, the weights 3 pass by, and the ring 6 remains stationary. At low engine speeds, the required acceleration time is reduced (in approximation, proportional to engine speed) and at a speed close to zero, ring 6 will turn and turn off the engine.

The relay is adjusted for the amount of speed at which the engine shuts down, is made by a) changing the pressure of the springs 8 on the balls 7 as you increase the pressure, the speed at which the power goes off increases; when you decrease the pressure, this speed decreases; B) by changing the swing moment of the ring b, by moving the nuts 77; as the flywheel moment increases, the speed at which the engine shuts down decreases .c and vice versa.

Preliminary Invention.

Claims (3)

1. A centrifugal speed relay consisting of centrifugal weights arranged for longitudinal movement on radially mounted rods of a rotatable part and assigned to interact at a certain speed with a rotary contact part, characterized in that, in order to improve the accuracy of the relay in case of use it as a reverse current relay for electric motors, interacting with loads 3 parts 7 of the rotary contact part 6, 14 are made movable and loaded with springs 8, so measured in relation to the moments of resistance and inertia of part b, 14, so that the duration of coupling of loads 3 to parts 7 at high speeds was not sufficient to rotate part 6, 14, but reached the value required for this value at low speeds. 2. In the relay of claim 1, use screws 9 for adjusting the springs 8, loading parts 7. 3.B relay on PP. 1 and 2, the use of adjustable weights to regulate the inertia of the pshorted contact part b, J4. FIG. 2 srig. one