CN1315146C - An external mechanical manual opening device of a permanent magnet mechanism - Google Patents

Abstract

The present invention discloses an external mechanical manual switch off device with a permanent magnet mechanism, which comprises a double-eccentric wheel 1, an axle sleeve 2, a supporting base 3, a top cap 4, a wheel axle 5, a torsion spring 6, a connecting joint 7, a joint bolt 8, a torsion spring hanging pin 9, and a torsion spring locking pin 10. The present invention which increases the active pivots of the force has the advantages that the symmetry is good, the force-bearing point is balanced, and the problem that the dynamic iron core deviates from the centre line is overcome.

Description

An external mechanical manual opening device of a permanent magnet mechanism

Technical field

The invention relates to the technical field of power supply and distribution in electric power systems, in particular to an external mechanical manual opening device of a permanent magnet mechanism of a high-voltage switch.

Background technique

The permanent magnet operating mechanism for high-voltage switches that has appeared in recent years has been successfully used in high-voltage and low-voltage switches in power systems due to its simple structure, few parts, and high reliability. At present, the structural types of permanent magnet mechanisms are developing towards diversification, and the disclosure of many patented technologies has promoted the continuous improvement of the technical level of permanent magnet mechanisms. Regardless of the structure type and working mode, the permanent magnet mechanism must have an emergency manual opening function, aiming at achieving reliable manual opening operation even under the condition of power failure. In terms of emergency manual opening, there are currently two methods, one is the magnetic short circuit method; the other is the mechanical cam force method. The published Chinese patents include ZL02205189.9, ZL01125119.0 and so on. These patents have technically solved the problem of emergency manual opening, but these manual opening devices still have certain shortcomings and defects. One is that there is a small air gap between the magnetic short circuit disc and the outer yoke, due to friction After a long period of non-use, the oxidation of air and other reasons lead to the formation of Fe ₃ O ₄ in the air gap. Once the magnetic short-circuit disc is used to manually open the brake, there will be frictional resistance and jamming between the magnetic short-circuit disc and the outer yoke due to Fe ₃ O ₄ , this shortcoming prevents the brake from being opened or affects the opening speed; the second is that the mechanical cam is Single cam, single fulcrum, poor stability during use, mechanical sprain caused by eccentric load. There are few acting points of the force, and the asymmetry of the force on the end face of the moving iron core causes an imbalance, and the moving iron core is deviated from the center line by the external force. The mechanical single cam, single fulcrum, and the overly simple design of the manual opening device are the main reasons for the above-mentioned defects.

Contents of Invention

The purpose of the present invention is to overcome the above-mentioned shortcomings and defects, and provide a more reasonable external mechanical manual opening device suitable for permanent magnet mechanisms of any structure. It increases the fulcrum of the force, has good symmetry, balances the force point, and overcomes the problem that the moving iron core deviates from the center line.

To achieve the above object, the present invention adopts the following technical solutions:

An external mechanical manual opening device of a permanent magnet mechanism, including a double eccentric wheel, a shaft sleeve, a support, a top cap, a wheel shaft, a torsion spring, a connector, a connector bolt, a torsion spring hanger pin, and a torsion spring pin The composed mechanical manual opening device is characterized in that:

①In the above-mentioned mechanical manual opening device, the double eccentric wheel and the wheel shaft are integrated, placed symmetrically on both sides of the force guide rod of the permanent magnet mechanism, and the two ends of the wheel shaft are respectively placed in the shaft holes of the two supports;

②In the above-mentioned mechanical manual opening device, the inner hole of the support is interference-fitted with a bushing, and the support is symmetrically fixed on the upper end plane of the permanent magnet mechanism with bolts;

③The top cap in the above-mentioned mechanical manual opening device is located above the double eccentric wheel, and is fixed on the upper end of the force guide rod of the permanent magnet mechanism. Turning the wheel shaft can make the double eccentric wheel contact with the top cap and make it subject to the active force in the upward direction.

④Put a torsion spring on the right side of the wheel shaft in the above-mentioned mechanical manual opening device. One end of the torsion spring is fixed on the torsion spring pin, and the other end is fixed on the torsion spring pin. The pins are respectively threaded and connected to the axle and the support;

⑤For the wheel shaft in the above mechanical manual opening device, the outer hexagonal square sleeve at the right end is inserted into the inner hexagonal hole at the left end of the connecting head, and the connection is realized by matching the connecting head bolt with the center screw at the right end of the wheel shaft.

The above-mentioned external mechanical manual opening device of the permanent magnet mechanism is characterized in that the torsion spring hanging pin and the torsion spring pin have the function of limiting and resetting under the force of the torsion spring.

The shaft sleeve of the present invention is made of silicon bronze material, and the purpose is to reduce the friction coefficient when the wheel shaft rotates, reduce wear and tear, and improve the service life.

The steel used in the connector and the top cap of the present invention should be quenched, the purpose is to improve the mechanical strength, the inner cavities on the left and right sides of the connector are all hexagonal, and the purpose is to cooperate stably with the outer hexagon of the right end of the wheel shaft and the outer hexagon of the handle transmit external force.

The novelty of the present invention lies in that the matching relationship between the double eccentric wheels, the double supports and the torsion spring solves the fulcrum symmetrical balance of force and the automatic reset function of the eccentric wheels.

Description of drawings

Fig. 1 is an axial half-sectional view of the closing state of a specific embodiment of an external mechanical manual opening device adopting a permanent magnet mechanism of the present invention.

Fig. 2 is a side view of the mechanical manual opening device of the present invention.

An external mechanical manual opening device of a permanent magnet mechanism shown in Figure 1 includes: double eccentric wheels (1), bushing (2), support (3), top cap (4), wheel shaft (5), Torsion spring (6), connector (7), connector bolt (8), torsion spring hanging pin (9), torsion spring pin (10).

Detailed ways

The working process of the embodiment of the present invention is: when manual opening is required, the outer hexagon of the end of the handle is inserted into the inner hexagon of the connector (7) and rotated counterclockwise, at this time, the eccentric wheel (1) applies an external force to the The top cap (4), the top cap (4) moves upward together with the force guide rod of the permanent magnet mechanism, and at this time the remaining holding force of the upper and lower two suction surfaces of the moving iron core of the permanent magnet mechanism is offset, and in the permanent magnet mechanism The opening spring releases energy, and the moving iron core moves upward to reach the end point to complete the opening. At the same time as the brake is opened, the torsion spring (6) on the wheel shaft (5) releases energy and rebounds, and the double eccentric wheel (1) rotates clockwise and returns to the end point. At this time, the torsion spring pin (9) and the torsion spring pin (10) The collision plays the role of limit and reset, and thus completes an opening cycle.

Claims (2)

1, a kind of external mechanical manual brake-separating device of permanent magnet mechanism, comprise double eccentric wheel (1), axle sleeve (2), bearing (3), top cap (4), wheel shaft (5), torsion spring (6), connector (7), connector bolt (8), torsion spring hanging pin (9), the mechanical-manual switching-off device that torsion spring pin (10) is formed is characterized in that:

1. double eccentric wheel in above-mentioned mechanical-manual switching-off device (1) and the integrated making of wheel shaft (5), symmetry is placed on the power guide post both sides of permanent magnet mechanism and two of wheel shaft (5) is inserted respectively in the axis hole of two bearings (3);

2. the endoporus interference fit of the bearing in above-mentioned mechanical-manual switching-off device (3) studs with axle sleeve (2), and bearing (3) is fixed on the last transverse plane of permanent magnet mechanism symmetrically with bolt respectively;

3. the top cap (4) in above-mentioned mechanical-manual switching-off device is positioned at the top of double eccentric wheel (1), and is fixed on the upper end of power guide post of permanent magnet mechanism.Rotating axle (5), double eccentric wheel (1) is contacted with top cap (4) and make its be subjected to upward to active force.

4. the right side of the wheel shaft in above-mentioned mechanical-manual switching-off device (5), put torsion spring (6), one end of torsion spring (6) is fixed on the torsion spring hanging pin (9), on torsion spring pin (10), torsion spring hanging pin (9) and torsion spring pin (10) screw thread cooperation respectively are not linked on wheel shaft (5) and the bearing (3) other end;

5. the wheel shaft (5) in the above-mentioned mechanical-manual switching-off device, its right-hand member outer-hexagonal side cover inserts in connector (7) the left end inner hexagonal hole, and cooperates realization to be connected by connector bolt (8) with the right-hand member center screw thread of wheel shaft (5).

2, the external mechanical manual brake-separating device of a kind of permanent magnet mechanism according to claim 1 is characterized in that torsion spring hanging pin (9) and torsion spring pin (10), has spacing and reset function under the power effect of torsion spring (6).

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