CN100397534C - automatic transfer switch - Google Patents

Abstract

The invention relates to a power transfer switching device, in particular to an automatic transfer switching device. It includes common and spare circuit breakers and an operating mechanism, wherein the operating mechanism includes a motor output shaft, a turntable, left and right shaft levers, left and right rocker arms, a limit wheel, and a bracket. Its purpose is to design an automatic transfer switch appliance with thin thickness and small volume. Compared with the prior art, the present invention has the advantages of simple and compact structure, super miniaturized volume, stable operation during operation, reliable mechanical interlock, long service life and easy manufacture.

Description

automatic transfer switch

technical field

The invention relates to a power transfer switching device, in particular to an automatic transfer switching device.

Background technique

Automatic power transfer switch, also known as "automatic transfer switch electrical appliances", is suitable for high-rise buildings, hospitals, shopping malls, banks, fire protection, chemical industry, metallurgy and other places that require uninterrupted normal power supply, and completes the dual-circuit power supply system (two mains or One-way mains + generator) or three-circuit power supply system (two-way mains + generator) power supply is automatically converted to ensure the reliability of power supply for important users. With the improvement of living standards, people have higher and higher requirements for the reliability of power supply, and automatic power transfer switches have gradually become indispensable equipment for power supply systems.

Automatic power transfer switches can be divided into two levels: PC level or CB level. PC level is an automatic power transfer switch that can be connected, carried, but not used to break short-circuit current. Class CB is an automatic power transfer switch equipped with an over-current release. Its main contacts can be connected and used to break the short-circuit current, and generally have an overload protection function at the same time. The size, cost and price of the PC-level automatic power transfer switch and the CB-level automatic power transfer switch are comparable. However, PC-level automatic power transfer switches do not have short-circuit protection and overload protection functions, so protection components (such as circuit breakers or fuses) must be added to distribution lines, and general CB-level automatic power transfer switches themselves have short-circuit protection and overload protection functions, so The distribution box (cabinet) composed of CB-level automatic power transfer switches is smaller in size and lower in cost, and its usage far exceeds that of PC-level.

The main components of CB level automatic power transfer switch are: controller, operating mechanism and two circuit breakers.

The ultra-miniaturization of automatic power transfer switch is the technical development direction in this field today, and the main point to overcome the miniaturization of automatic power transfer switch is the miniaturization of the operating mechanism. The current operating mechanism includes electromagnetic type and single motor type, single motor bidirectional The operating mechanisms currently include "turntable-slider two-way operating mechanism", "turntable-swing rod two-way operating mechanism" and "gear-slider two-way operating mechanism". Due to the structural limitations of the turntable, swing rod, gear, skateboard and other components, the size is relatively large , so that these single-motor operating mechanisms and electromagnetic operating mechanisms cannot achieve ultra-miniaturization.

Contents of the invention

The purpose of the present invention is to design a thin, small and exquisite automatic transfer switch electric appliance.

In order to achieve the above object, the present invention adopts the following technical solutions: an automatic transfer switch electrical appliance, including common and standby circuit breakers and an operating mechanism, which is characterized in that the operating mechanism includes a motor output shaft, a turntable, left and right shaft-shaped levers, a left , right rocker arm, limit wheel, bracket, the cross section of the limit wheel is composed of two semicircular surfaces with different radii, the bracket is connected between the common and standby circuit breakers, the limit wheel is coaxial with the turntable, and Connected with the output shaft of the motor, the left and right shaft-shaped levers are symmetrically arranged on the turntable, the fulcrums of the left and right rocker arms are symmetrically connected to the bracket, and the left and right shaft-shaped levers slide with one end of the left and right rocker arms respectively Connection, the other ends of the left and right rocker arms are plugged into the special-shaped holes on the flanges of the left and right operating handles, and the end face of the rocker arm facing the limit wheel is a smooth arc surface, which is connected to the larger radius arc of the limit wheel The surface constitutes the rocker limit device.

Since the connection point between the rocker arm and the operating handle is lower than the top of the circuit breaker, the overall height of the operating mechanism is reduced; secondly, the limit device directly uses the rocker part to reduce the number of parts. At the same time, the limit wheel is located in the middle of the turntable, occupying very little space Space, and the two ends of the rocker arm and the shaft-shaped lever and the operating handle are connected by plugging, and the distance between them is very short, which reduces the space occupied. Therefore, the adoption of the technical solution makes the thickness of the automatic transfer switch electrical appliance thinner and smaller, and the requirement of ultra-miniaturization of the automatic transfer switch is truly realized.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a top view of the structure of this embodiment.

Fig. 2 is an enlarged view of part A in Fig. 1 .

Figure 3a is a front view of the turntable structure.

Fig. 3b is a top view of Fig. 3a.

Figure 4a is the front view of the handle structure of the left operating mechanism.

Fig. 4b is a sectional view along B-B in Fig. 4a.

Fig. 5 is a structural schematic diagram of the left rocker arm part.

Fig. 6a is a schematic diagram of the left and right rocker arms in the state of left closing and right opening.

Fig. 6b is a schematic diagram of the left and right rocker arms in the state of left split and right split.

Fig. 6c is a schematic diagram of the left and right rocker arms in the state of left opening and right closing.

Detailed ways

As shown in Fig. 1 and Fig. 2, the present embodiment includes common and standby circuit breakers 2, 3 and an operating mechanism, wherein the operating mechanism includes a motor output shaft 12, a turntable 9, left and right axial levers 8, 10, a left , right rocker arm 7,11, limit wheel 15, operating mechanism handle 1,4, support 6. The support 6 is connected between the common and standby circuit breakers 2,3, and the fulcrums of the left and right rocking arms 7,11 are symmetrically connected to the support 6.

As shown in Fig. 3a-Fig. 3b, the turntable 9 is made up of two turntable plates 16, 17 up and down. Connected, the left and right shaft-shaped driving rods 8, 10 are symmetrically arranged on the turntable, and the cross section of the limit wheel 15 is composed of two semicircular surfaces with different radii.

As shown in Figure 5, one end of the left and right rocker arms 7, 11 is respectively provided with a through groove 21, which cooperates with the left and right shaft-shaped driving rods 8, 10 to form a sliding connection, and faces the limit wheel 15 The rocking arm end face 22 is a smooth arc surface, and it forms the rocking arm limiting device with the arc surface of the larger radius of the limiting wheel.

As shown in Figures 4a-4b, the left and right operating mechanism handles 1 and 4 are folded at 90° at the left and right ends, the middle part of the handle is a curved concave groove 20, and the circuit breaker handle 5 is inserted in the concave groove 20 for assembly. Convenient, the two ends of the flange are hinged on the side of the circuit breaker, the rotation axis of the handle of the operating mechanism and the rotation axis of the handle of the circuit breaker are on the same straight line, the left and right operating mechanism handles 1, 4 flanged special-shaped holes 19 and the left and right The other ends of the right rocking arm 7,11 are plugged in.

As shown in Fig. 2 and Fig. 3b, a shaft 13 is arranged on the circumference of the turntable 9, and two limit switches 14 are installed below the turntable 9, and the shaft 13 and the limit switch 14 cooperate to correspond to the rotation position of the turntable 9. 9 The rotation angle is electrically limited.

When the left circuit breaker (generally connected to the common power supply) needs to be closed, the motor output shaft 12 rotates counterclockwise to drive the turntable 9 to rotate counterclockwise, and the left shaft-shaped lever 8 drives the left rocker arm 7 to rotate clockwise, so that The handle 1 of the left operating mechanism and the handle of the circuit breaker rotate upward to complete the closing action of the left circuit breaker. At the same time, the arc surface with a larger radius of the limit wheel 15 in the turntable 9 and the smooth arc end surface 22 of the right rocker arm work together to make The circuit breaker on the right is locked in the OFF state (as shown in Figure 6a).

When the circuit breaker on the right side (generally connected to the standby power supply) needs to be closed, at this time, the left and right rocker arms are in the state shown in Figure 6a (that is, the circuit breaker is left closed and right opened), and the motor output shaft 12 rotates clockwise to drive the turntable 9 Rotate clockwise, drive the left rocker arm 7 to rotate counterclockwise through the left shaft-shaped lever 8, and make the left operating mechanism handle 1 and the circuit breaker handle rotate downward to complete the opening action of the left circuit breaker, so that the left and right circuit breakers Both are in the opening state (as shown in Figure 6b), the turntable 9 continues to rotate clockwise, the right shaft-shaped lever 10 drives the right rocker arm 11 to rotate counterclockwise, and the right operating mechanism handle 4 and the circuit breaker handle rotate upward The closing action of the right circuit breaker is completed, and at the same time, the limit wheel 15 in the turntable 9 and the left rocker arm 7 work together to lock the left circuit breaker in the opening state (as shown in Figure 6c). vice versa.

To sum up, the present invention has the advantages of simple structure, thin thickness, small volume, less mechanism consumables, easy manufacture, and low cost; the switch has low noise, stable action, no impact on the handle of the circuit breaker, reliable mechanical interlock, and no damage to the circuit breaker. Two-way power supply short-circuit failure, long service life. Because all the components making up the operating mechanism are small in volume and compact in structure, the present invention has ultra-small volume.

Claims (4)

1. automatic transfer switching electric appliance, comprise commonly used and back-up breaker (2,3) and operating mechanism, it is characterized in that operating mechanism comprises motor output shaft (12), rotating disk (9), a left side, right axle shape driving lever (8,10), a left side, right rocking arm (7,11), position-limited wheel (15), support (6), the cross section of described position-limited wheel (15) is made up of the semi circular surface of two different radiis, support (6) is connected commonly used and back-up breaker (2,3) between, position-limited wheel (15) is coaxial with rotating disk (9), and be connected with motor output shaft (12), a left side, right axle shape driving lever (8,10) be arranged symmetrically on the rotating disk, a left side, right rocking arm (7,11) fulcrum symmetry axis is connected on the support (6), a left side, right axle shape driving lever (8,10) respectively with a left side, right rocking arm (7,11) end is slidingly connected, a left side, right rocking arm (7,11) other end and a left side, right operating grip (1,4) irregularly-shaped hole on the flanging (19) is pegged graft, with position-limited wheel (15) rocking arm end face (22) in opposite directions be smooth arc, the cambered surface than long radius of it and position-limited wheel (15) constitutes the rocking arm stopping means.

2. automatic transfer switching electric appliance according to claim 1, it is characterized in that left and right operating grip (1,4) two ends, the left and right sides are with 90 ° of flangings, the flanging two ends are hinged on the side of circuit breaker, and the handle middle part is curved shape Baltimore groove (20), and circuit breaker handle (3) is inserted in the Baltimore groove (20).

3. automatic transfer switching electric appliance according to claim 2 is characterized in that an end of described left and right rocking arm (7,11) all has groove (21) respectively, and matching to constitute with described left and right axle shape driving lever (8,10) is slidingly connected.

4. automatic transfer switching electric appliance according to claim 3 is characterized in that described rotating disk (9) is made up of two disk plates (16,17) up and down, and position-limited wheel (15) is located between two disk plates.

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