JPH043376Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The invention consists of a vacuum valve that includes a movable electrode and a fixed electrode, each of which has a contact point, an electromagnet that is normally located below the vacuum valve, and a vacuum valve that includes a movable electrode and a fixed electrode that each have a contact point. It consists of an opening/closing lever equipped with a movable iron core that joins or separates from the fixed iron core by excitation or demagnetization, and when the movable iron core joins or separates from the fixed iron core, the opening/closing lever The present invention relates to a vacuum switch which rotates around a fulcrum shaft and drives the movable electrode to close or open the contacts of the movable electrode and the contacts of the fixed electrode. In this type of vacuum switch, it is important that the opening/closing lever for driving the movable electrode be as simple in construction as possible and that it can reliably perform its prescribed duties.

[Prior art and its problems]

A general vacuum switch as described above is known from the specification of Japanese Patent Application Publication No. 59-54136. In the known vacuum switch, as shown in FIGS. 4 and 5, an opening/closing lever 21 that drives the movable electrode to close or open the contact between the contact and the fixed electrode is made of synthetic resin. The movable iron core 22 is housed inside a recess 29 formed near one end of the molded main body, and one pin 23 and retainers 24 at both ends of the pin 23 are provided to prevent the pin from falling out.
The movable iron core 22 is held by the fulcrum shaft 25, and the movable iron core 22 is rotatable about the fulcrum shaft 25.

On the other hand, the opening/closing lever 21 is attached to the mounting base 28.
A fixed iron core 26 is firmly fixed at a position corresponding to the movable iron core 22 held in the movable iron core 22, and together with an excitation coil 27 surrounding the fixed iron core 26, constitutes the electromagnet. Therefore, by exciting the excitation coil 27 of the electromagnet, the fixed iron core 26 becomes the movable iron core 2.
2, the opening/closing lever 21 resists the force of its tripping spring (not shown) and rotates its fulcrum shaft 25.
The vacuum lever rotates counterclockwise in FIG. A movable electrode (both not shown) of the valve is driven, and a contact point of the movable electrode and a contact point of the fixed electrode (both not shown) are connected with the movable iron core 22 joined to the fixed iron core 26 of the electromagnet. The two contacts are closed by the differential pressure of the vacuum valve and the force of a pressurizing spring (not shown).

However, as is clear from FIGS. 4 and 5, in the opening/closing lever 21, the movable iron core 22 is supported by one pin 23.
Although it has a certain degree of freedom in the direction of rotation around point 3, there is no movement in the horizontal directions, front, back, left, right, etc. Therefore, if the opening/closing lever 21 is positioned with respect to the electromagnet due to the dimensional error, it will not work as it is during suction. A complete joint between the movable core 22 and the fixed core 26 of the electromagnet becomes difficult. Therefore, it is necessary to insert a liner between the fixed core 26 and the mounting base 28 to adjust the posture of the fixed core 26 and to improve the joint between the core 26 and the movable core 22. Furthermore, since the opening/closing lever 21 made of synthetic resin has a structure in which the movable iron core 22 is held by one pin 23, the force acting on the opening/closing lever 21 through the pin 23 is affected by the force in the part where the pin 23 penetrates. There is concern about the mechanical strength of the lever 21, and furthermore, if a hole is formed at the time of molding the lever 21 through which the pin 23 passes through the opening/closing lever 21, the hole will not fit into the mold that is normally divided into upper and lower halves. It is necessary to insert the pin-shaped body from the side to form the mold, which makes the mold expensive, and it is not possible to change the method and create a hole in the opening/closing lever 21 after molding by machining. It is uneconomical because it is complicated and requires extra man-hours.

[Purpose of invention]

In view of the above-mentioned drawbacks of the open/close levers of known vacuum switches, the present invention eliminates concerns about the strength of the part that holds the movable iron core of the open/close lever, which is molded from synthetic resin, and allows the movable iron core to be attached to the holding part. The iron core holding means can be formed at the same time as the opening/closing lever is formed using a simple mold,
Therefore, it is not necessary to form the opening/closing lever by machining after molding, and the opening/closing method is such that the fixed iron core of the electromagnet and the movable iron core are held so that they can completely join each other during suction. An object of the present invention is to provide a vacuum switch equipped with a lever.

[Key points of the idea]

In order to achieve the above object, the present invention provides the vacuum switch mentioned above, in which the movable iron core is housed in a recess formed near one end of the opening/closing lever with an appropriate gap in between, and the back surface thereof is A plate supported by a cushion material having appropriate elasticity disposed on the bottom surface of the recess and held by the opening/closing lever in a recess provided between surfaces that are attracted to the fixed core of the electromagnet. By abutting and supporting the spherical surface of the protrusion formed at approximately the center of the shaped body, the resilient cushion material and the plate-shaped body having the protrusion forming the spherical surface The movable core is allowed to freely move forward, backward, left and right, and the movable core is completely joined to the fixed core when the electromagnet is attracted.

[Example of idea]

Next, the present invention will be explained in detail based on the embodiments shown in the drawings.

As shown in Figures 1 and 2, the movable iron core 2 has a U-shaped cross section (Figure 2) and is a recess formed near one end of the opening/closing lever 1 made of synthetic resin. 3, and at this time, the back surface of the movable iron core 2 has a cushion rubber 10 arranged approximately in the center of the bottom surface of the recess 3 and the rubber 1.
The surface of the electromagnet 12 that is attracted to the fixed core 6 is supported by four cushion springs 11 arranged approximately parallel to the four sides of the back surface of the movable core 2 around the movable core 2. As shown in FIG. 2, the I-shaped movable core restraining plate 9, which is screwed to the lower surface of the opening/closing lever 1 through four screw holes 9b and has a spherical surface 9a formed approximately in the center thereof, forms a U-shape. The concave portion 2b between the leg portions 2a of the movable iron core 2 is abutted and supported by the spherical surface 9a, and the leg portions 2a of the movable iron core 2 are
The opening/closing lever 1 is configured such that the opening/closing lever 1 projects from the lower surface thereof by a predetermined distance.

On the other hand, the fixed core 6 of the electromagnet 12 is formed in a U-shape like the movable core 2, and its legs 6a are attached to the mounting base 8 at positions corresponding to the legs 2a of the movable core 2.
An excitation coil 7 is attached to each leg 6a.

In the opening/closing lever 1 and electromagnet 12 of the vacuum switch according to the present invention configured as described above, by exciting the excitation coil 7, the fixed iron core 6 of the electromagnet 12 attracts the movable iron core 2, and the opening/closing lever 1 is activated. It resists the force of the tripping spring (not shown) and rotates counterclockwise in FIG. A movable electrode (both not shown) of a vacuum valve connected to the end 4 of the lever 1 via appropriate means is driven, and when the movable iron core 2 is joined to the fixed iron core 1, the contact point of the movable electrode is Closing the contacts of the fixed electrode (not shown) of the vacuum valve by the differential pressure of the vacuum valve acting on both contacts and the force of a pressurizing spring (not shown) is a method of conventional vacuum switches. Same as in case.

However, in the opening/closing lever 1 of the vacuum switch related to the present invention, there is an appropriate gap between the movable core 2 and the recess 3 that accommodates the movable core 2, and the movable core 2 is Its back surface is supported by the cushioning rubber 10 and a plurality of cushioning springs 11, and the concave portion 2b between the legs 2a that joins the fixed iron core 6 is connected to the spherical surface 9a of the protrusion of the movable iron core holding plate 9. Since the movable core 2 is abutted and supported, when the movable core 2 is attracted by the electromagnet 12, the movable core 2 can freely change its posture so that the attracting surface of the movable core 2 adapts to the attracting surface of the fixed core 6. Complete joining of the iron core 6 and the movable iron core 2 can be realized.

[Effect of idea]

As explained above, the present invention includes a vacuum valve that includes a movable electrode and a fixed electrode, each of which has a contact point, an electromagnet that is normally located below the vacuum valve, and a fixed electrode that can be fixed by exciting or demagnetizing the electromagnet. It consists of an opening/closing lever equipped with a movable core that connects or disconnects from the iron core, and when the movable core connects or disconnects from the fixed core, the opening/closing lever rotates about its fulcrum axis. In the vacuum switch which drives the movable electrode to close or open the contacts of the movable electrode and the contacts of the fixed electrode, the movable iron core is located in a recess formed near one end of the opening/closing lever. The electromagnet is housed with an appropriate gap in between, the back side of which is supported by a cushion material having appropriate elasticity placed on the bottom of the recess, and the surface that is attracted to the fixed core of the electromagnet. The movable iron core can self-adjust its posture by making the recess provided in the opening/closing lever contact and support the spherical surface of the protrusion formed approximately in the center of the plate-shaped body held by the opening/closing lever. Since it is possible to absorb dimensional errors in positioning the opening/closing lever relative to the electromagnet, it is possible to eliminate the labor of inserting a liner between the fixed core and the mounting base and adjusting the posture of the fixed core during assembly. The manufacturing and assembly of parts has become extremely easy, and since the movable iron core is fixed to the opening/closing lever with at least four vertical screws, the movable iron core holding part of the opening/closing lever body made of synthetic resin can be easily fixed. Concerns about mechanical strength are eliminated, and the holes for the screws can be easily formed using a molding mold that is split into upper and lower halves when molding the opening/closing lever, so the holes can be made by machining after molding the opening/closing lever. This has the effect of improving vacuum switch manufacturing technology and reducing costs, such as eliminating the need to do so.

[Brief explanation of the drawing]

Figures 1 and 2 are a schematic vertical cross-sectional view and a front view of the opening/closing lever and electromagnet of a vacuum switch related to the present invention, and Figure 3 is a schematic perspective view of a movable core holding plate.
FIGS. 4 and 5 show a schematic vertical cross-sectional view and a front view of an opening/closing lever and an electromagnet of a conventional vacuum switch. 1... Opening/closing lever, 2... Movable iron core, 2a...
Leg portion of the movable iron core, 2b... Recessed portion of the movable iron core, 5...
...Fully shaft, 6... Fixed iron core, 7... Excitation coil,
9...Movable core holding plate, 9a...Spherical diagram of the protrusion of the moving iron core holding plate, 10...Rubber for cushion,
11...Cushion spring, 12...Electromagnet.

Claims (1)

[Scope of utility model registration request] A vacuum valve incorporating a movable electrode and a fixed electrode, each having a contact point, an electromagnet usually located below the vacuum valve, and a movable iron core that moves toward and away from the fixed iron core by exciting or demagnetizing the electromagnet. When the movable iron core moves toward and away from the fixed iron core, the opening/closing lever rotates about its fulcrum shaft, and drives the movable electrode to connect its contacts and the In a vacuum switch configured to close or open a contact point of a fixed electrode, the movable iron core is housed in a recess formed near one end of the opening/closing lever with an appropriate gap therebetween; The back surface is supported by a cushion material having appropriate elasticity disposed on the bottom surface of the recess, and the recess provided between the surfaces attracted to the fixed core of the electromagnet is held by the opening/closing lever. 1. A vacuum switch characterized in that the vacuum switch is supported in contact with a spherical surface of a protrusion formed approximately at the center of a plate-like body.