JPH08222063A - Switch - Google Patents

Abstract

PURPOSE: To downsize a switch and reduce the cost by improving the structure of a tulip contact. CONSTITUTION: In a switch in which one of opening and closing contact parts is formed of a tulip contact, a tulip contact 1 is formed by cylindrically arranging a plurality of contact elements 3. A gutter spring 4 arranged on the top end outer circumference of the contact elements 3 to add a contact pressure imparts the contact pressure to the contact elements, and also constitutes a part of the top end form of the tulip contact. This gutter has shielding effect because it is an annularly formed spring, the top end of the tulip contact has a form of hardly collecting the electric field. Thus, a shield need not be provided separately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch such as a circuit breaker, a disconnector or a ground switch, and more particularly to a switch in which one of the contact portions is a tulip-shaped contact.

[0002]

2. Description of the Related Art A switch having a conventional tulip-shaped contact is shown in FIG. FIG. 3 shows a contact portion of the switch in cross section. In FIG. 3, 11 is a tulip-shaped contactor, and 12 is a movable contactor. The movable contact 12 is
It is moved in the direction of the arrow by a driving mechanism (not shown) to make contact with or separate from the tulip-shaped contactor 11. FIG. 3 shows a state in which the switch is off.

The tulip-shaped contactor 11 is formed by arranging a plurality of contactors 13 in a cylindrical shape. The tulip-shaped contactor 11 is attached to the fixed contactor base 16 by a garter spring 15 arranged on the outer circumference on the base side.
Further, a contact pressure is applied to the movable contact 12 by the garter spring 14 arranged on the outer periphery of the tip of the contact 13.

A shield 17 is provided to cover the tip and the outer periphery of the tulip-shaped contactor 11 and relax the electric field. This shield 17 is a garter spring 1
4 holds the tip of the tulip-shaped contactor 11 biased inward.

[0005]

In the above conventional switch, when the tulip-shaped contactor 11 and the movable contactor 12 are separated from each other, a voltage is applied between the contactors 11 and 12. At this time, the contact 13 of the tulip-shaped contact 11
Since the tip of the has a shape where the electric field is easily concentrated,
A shield 17 is provided.

As described above, since the tulip-shaped contactor 11 in the conventional switch requires the shield 17,
The price was high due to the production of the shield 17 and the processing of the fixed contact base 16. In addition, since the installation space for the shield 17 is required, the switch is increased in size. It is an object of the present invention to reduce the size and cost of a switch by improving the structure of a tulip-shaped contactor.

[0007]

In order to achieve the above object, the present invention provides a switch in which one of the contact portions to be opened and closed is formed by a tulip-shaped contactor, and the tulip-shaped contactor has a plurality of contactors. The garter springs are arranged in a cylindrical shape, and a garter spring for applying a contact pressure is arranged on the outer circumference of the tip of the garter spring, and the tip of the contactor is formed in an arc shape along the surface of the garter spring. The shape formed by and the tip portion of the contactor is a shape that relieves the concentration of the electric field at the tip portion of the tulip-shaped contactor.

[0008]

The garter spring provided on the tip side of the tulip-shaped contactor applies a force directed inward to the tip of the contactor, and at the same time forms a part of the shape of the tip of the contactor. Since this garter spring is an annular spring, it has a shielding effect, and the tip of the tulip-shaped contactor has a shape in which the electric field is less likely to concentrate. Therefore, it is not necessary to separately provide a shield.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a contact portion of a switch in cross section. Reference numeral 1 is a tulip-shaped contactor, and 2 is a movable contactor. The tulip-shaped contactor 1 is formed by arranging a plurality of contactors 3 in a cylindrical shape, and is attached to a fixed contactor base 6 by a garter spring 5. The fixed contact base 6 has a ring-shaped recess 7 for receiving the contact 3. Further, the garter spring 4 is fitted on the outer circumference of the tip of the contactor 3, and an inward force is applied.

FIG. 1A shows a state in which the movable contactor 2 is separated from the tulip-shaped contactor 1 and the contacts are off.
(B) shows the state where the contact is on. When the movable contactor 2 is separated as shown in FIG. 1A, the contactor 3 is biased inward by the garter spring 4 and contracts, and the inside thereof is supported by the fixed contactor base 6. At this time, the inner diameter of the tulip-shaped contactor 1 is set to be slightly smaller than the outer diameter of the movable contactor 2.

When the contactor 3 contracts inward by the garter spring 4, the adjacent contactors contact each other and do not contract further inward with a certain contraction amount. Therefore, the member that supports the inward deformation of the garter spring 4 can be omitted. When the contact is turned on, the movable contactor 2 is moved from the state of FIG. 1A to the left in the drawing by a driving mechanism (not shown). First, the outer circumference of the tip of the movable contactor 2 is engaged with the inner circumference of the tip of the contactor 3. Further, if the movable contactor 2 moves to the left in the drawing while spreading the contactor 3 biased inward by the garter spring 4 to the outside, the movable contactor 2 will be in the ON state of FIG. 1B. The garter spring 4 gives a contact pressure to the contactor 3.

Details of the contact 3 are shown in FIG. Figure 2 (a)
Is a side view of the contactor 3, and (b) is a front view. Contact 3
Is formed of a conductive material such as copper, and recesses 8 and 9 for receiving the garter springs 4 and 5 are formed at both ends of a small piece having a thickness t and a width w. Rb of these depressions 8 and 9
Is approximately equal to the radius of the garter springs 4 and 5. In addition, the corners of the tip of the contact 3 are rounded, and the radius R
2 is 1/2 or more of the thickness t.

The tip of the contactor 3 is prevented from protruding too much from the surface of the garter spring 4, and the recess 8 for receiving the garter spring 4 is sufficiently formed. The other end side of the contactor 3 can be formed similarly to the tip side. With the above configuration, the shape of the tip portion of the tulip-shaped contactor 1 where the electric field is concentrated is determined by the tip portion of the contactor 3 and the garter spring 4. Therefore, a shield effect can be obtained by making the diameter of the garter spring 4 large enough to reduce the concentration of the electric field, and it is not necessary to separately provide a shield.

Since it is not necessary to separately provide a shield, the production and mounting of the shield can be omitted, and the cost of the switch can be reduced. Also,
Since it is not necessary to dispose a separately provided shield, the switch can be downsized.

[0015]

According to the present invention, the shield of the tulip-shaped contactor which has been conventionally required can be omitted, the cost of the switch can be reduced, and the size of the switch can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a contact portion of an embodiment of a switch according to the present invention.

2A and 2B are a side view and a front view showing a detailed configuration of the contactor of FIG.

FIG. 3 is a sectional view showing a contact portion of a conventional switch.

[Explanation of symbols]

 1 ... Tulip-shaped contactor 2 ... Movable contactor 3 ... Contactor 4, 5 ... Garter spring 6 ... Fixed contactor stand 7, 8, 9 ... Recess

Claims (1)

[Claims] 1. A switch in which one of the contact portions for opening and closing is formed of a tulip-shaped contactor, wherein the tulip-shaped contactor is formed by arranging a plurality of contactors in a cylindrical shape, and the tulip-shaped contactor is formed on an outer periphery of a tip thereof. A garter spring for applying a contact pressure is arranged, the contact is formed in an arc shape along the surface of the garter spring at its tip end,
The switch formed by the garter spring and the tip portion of the contact has a shape that relieves the concentration of the electric field at the tip portion of the tulip-shaped contact.