Structure of centrifugal switch

Abstract

The invention discloses a structure of centrifugal switch, including: a cylinder type hollow shaft with a motor shaft through, arranged with a flange and formed with guide arms; a shaft mechanism inserted in the back of the flange of the hollow shaft and moving in the axial direction of the hollow shaft and a slide block situated at the back end of the shaft mechanism and forming a shaft lining in the radial direction; the centrifugal brakes with the guide arms passing through the through hole, arranged the left and right sides of the shaft mechanism of the slide block in a hinging mode at the same time and able to turn, and opened under the action of centrifugal force; an extension spring linking two-side centrifugal brakes, making them approach to each other as they are not acted by the centrifugal force and providing return force; a buffer pad provided on the contact surface between the slide block and hollow shaft or on the shaft lining of the slide block. It uses the buffer pad to effectively reduce the produced noise as the brakes act and improve the reliance of the products.

Description

technical field [0001] The invention relates to a centrifugal switch, in particular to a centrifugal switch which reduces the contact noise generated when a switch on a motor in a household electric appliance operates. Background technique [0002] Usually, centrifugal switches are used in electric motors of home appliances such as clothes dryers, such as figure 1 As shown, the electric motor 8 comprises a stator assembly 8b equipped with a main winding wire 9 and an auxiliary winding wire 10 (or starting winding wire). The shaft 7 of the motor of the rotor 8a can rotate inside the stator assembly 8b. [0003] Such as Figure 2a and Figure 2b As shown, a centrifugal force on-off switch, that is, a centrifugal switch 1, is provided on the crankshaft 7 of the motor. [0004] Centrifugal force switch 1 is closed when the motor rotates at a low speed, but as the speed increases, when it reaches 70% to 80% of the synchronous speed, the circuit is disconnected. That is, alth...

AI Technical Summary

Problems solved by technology

[0011] The centrifugal switch 1 of the prior art produces noise when the circuit is disconnected, that is, when the rotating speed of the motor shaft 7 increases, and when the centrifugal force caused acts on the centrifugal brake 4, the head end of the slider 3 will be in contact with the hollow shaft 2. The 210 faces of the flanges collide and produce noise

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