GOVERNOR ASSEMBLY AND ELEVATOR SYSTEM

• US 20190330019A1
• Filed: 04/23/2019
• Published: 10/31/2019
• Est. Priority Date: 04/25/2018
• Status: Active Grant

• Current Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Original Assignee: Otis Elevator Company (Otis Worldwide Corp.)
• Inventors: Shi, Zhengbao
• Granted Patent: US 11,465,881 B2
• Time in Patent Office: Days
• CPC Class Codes: B66B 1/32 effective on braking devices , e.g. acting on electrically controlled brakes brake control H02P, lift brakes per se B66B5/02
• CPC Class Codes: B66B 1/343 Fault-tolerant or redundant control system configuration
• CPC Class Codes: B66B 5/044 Mechanical overspeed governors
• CPC Class Codes: B66B 5/06 electrical
• CPC Class Codes: B66B 7/06 Arrangements of ropes or cables
• CPC Class Codes: B66D 1/56 Adaptations of limit switches

Abstract

A speed governor assembly and an elevator system. The speed governor assembly includes: a sheave; a centrifugal mechanism mounted on the sheave and rotating together with the sheave; an overspeed protection switch at a first distance from a radial outer side of the centrifugal mechanism; a core ring disposed coaxially with the sheave; and a triggering arm rotating together with the core ring; wherein the centrifugal mechanism engages with the core ring and drives the core ring and the triggering arm to rotate when the sheave reaches a second speed, and the rotation of the triggering arm can contact and trigger the overspeed protection switch.

Claims

1. A speed governor assembly, comprising:

a sheave;

a centrifugal mechanism mounted on the sheave and rotating together with the sheave;

an overspeed protection switch at a first distance from a radial outer side of the centrifugal mechanism;

a core ring disposed coaxially with the sheave; and

a triggering arm rotating together with the core ring;

wherein the centrifugal mechanism engages with the core ring and drives the core ring and the triggering arm to rotate when the sheave reaches a second speed, and the rotation of the triggering arm can contact and trigger the overspeed protection switch.

2. The speed governor assembly of claim 1, wherein when the sheave reaches a first speed, the centrifuge mechanism is deployed to a degree such that it can contact and trigger the overspeed protection switch.

3. The speed governor assembly of claim 2, wherein the first distance is set such that a ratio of the first speed to the second speed is in a range of 0.9-1.0, excluding 1.0 preferably, in a range of 0.95-1.0, excluding 1.0.

4. The speed governor assembly of claim 1, wherein the triggering arm is directly connected to the core ring.

5. The speed governor assembly of claim 1, wherein the core ring is connected to a rocker arm, and the triggering arm is connected to the rocker arm.

6. The speed governor assembly of claim 5, wherein the core ring drives the rocker arm to rotate and triggers a mechanical brake device when the sheave reaches the second speed.

7. The speed governor assembly of claim 5, wherein the rocker arm has a first end and a second end, the first end of the rocker arm is connected to the core ring, and the second end of the rocker arm is connected to a safety gear pull rod.

8. The speed governor assembly of claim 7, wherein the triggering arm is connected between the first end and the second end of the rocker arm and extends upwardly.

9. The speed governor assembly of claim 4, wherein the triggering arm is in a shape of plate or column, and the triggering arm has a proximal end for connection with the rocker arm or the core ring and a distal end for triggering the overspeed protection switch.

10. The speed governor assembly of claim 9, wherein the distal end of the triggering arm has an axial extension portion that is aligned with a contact end of the overspeed protection switch.

11. The speed governor assembly of claim 9, wherein the proximal end of the triggering arm is connected to the rocker arm or the core ring through a plurality of bolts.

12. The speed governor assembly of claim 5, wherein the triggering arm and the overspeed protection switch are on the same side of the rotation axis of the sheave.

13. The speed governor assembly of claim 12, wherein the overspeed protection switch is above the triggering arm.

14. The speed governor assembly of claim 1, wherein the centrifugation mechanism comprises a plurality of centrifugal block supports each carrying a centrifugal block, a plurality of connecting rods connected between the plurality of centrifugal block supports and a retaining mechanism holding the plurality of centrifugal block supports together.

15. The speed governor assembly of claim 14, wherein when the sheave reaches the first speed, the centrifugal block support is deployed to a degree such that the overspeed protection switch can be triggered.

16. The speed governor assembly of claim 14, wherein when the sheave reaches the second speed, a roller inside the plurality of connecting rods of the centrifugal mechanism engages with the core ring and drives the core ring to rotate.

17. The speed governor assembly of claim 14, wherein the retaining mechanism is a spring device or a magnetic device.

18. An elevator system, wherein the elevator system is configured with the speed governor assembly according to claim 1.

19. The elevator system of claim 18, wherein the speed governor assembly is mounted to an elevator car.

20. The elevator system according to claim 18, wherein a basic running speed of the car in the elevator system is less than or equal to 1.0 m/s.