JPH06338237A - Sealed contact device - Google Patents

Abstract

PURPOSE:To alleviate shock force to be applied to bellows when a contact is switched by interposing an elastic member between a sealing plate and a flange of a bellows protecting flame, which are positioned near each other. CONSTITUTION:When a sealing container 1 is pressingly driven at one end 11a of a movable shaft 11 projected from a through-hole 4a formed on a sealing plate 4 by a driving member such as an electromagnet, a movable contact 10 is driven via a contact-pressure spring 15 abutting against a flange 13a of a bellows protecting frame 13 so that a movable contact point 10a abuts against a fixed contact point 8a. Thereafter, when the end 11a of the movable shaft 11 is further pressingly driven, the movable contact 10 cannot be moved while the bellows protecting frame 13 fixed to the movable shaft 11 can be moved, thus contracting the contact-pressure spring 15 via an elastic member 14, where this force serves as a contact pressure. In the case where the movable shaft 11 is not pressingly driven, the movable contact 10 is returned to the original state by a return spring 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed contact device suitable for relays for power loads, electromagnetic switches and the like.

[0002]

2. Description of the Related Art Conventionally, there is a sealed contact device of this type having a structure shown in FIG. This is a sealed container in which the opening side of a bottomed box-shaped container body Aa is hermetically sealed with a sealing plate Ab to form an airtight space for housing contacts.
A, fixed contacts C and C with fixed contacts D and D, and movable contact F with movable contacts G and G that contact and separate from fixed contacts D and D.
And a bellows B, one end of which is hermetically fixed to the sealing plate Ab, and the other end of the bellows B, which is axially movable by being driven from the outside of the sealing container A by the one end Ia protruding from the sealing plate Ab. Has a movable shaft I that is airtightly linked to the movable shaft I, and a flange Ja that extends in the direction orthogonal to the movable shaft I near the sealing plate Ab so that the bellows B is surrounded by a bottom portion at the other end. A cylindrical bellows protection frame J with a fixed bottom and a coil that urges the movable contact F in the direction in which the contacts are abutted by being compressed by the flange Ja of the bellows protection frame J when the movable shaft I is driven. Shaped contact spring
H and a return spring K that biases the movable contact F in the direction in which the contacts open.

The operation is such that the movable shaft I has one end Ia sealed in a container.
When it is driven from the outside of A and is moved in the axial direction, the coil-shaped contact pressure spring H is compressed by the flange Ja of the bellows protection frame J and urges the movable contact F in the direction in which the contacts abut. Contact pressure is secured. Then, when the movable shaft I is no longer driven, the movable contact F is pushed back by the urging force of the return spring K and the contacts are opened.

[0004]

In the above-mentioned conventional sealed contact device, when the movable contact F is pushed back by the urging force of the return spring K when the contacts are separated, The bellows protection frame J is also accelerated in the same direction via the contact pressure spring H. Then, the flange Ja of the bellows protection frame J
Is extended near the sealing plate Ab of the sealing container A, it collides with the sealing plate Ab, and the impact force is transmitted to the bellows B that is airtightly linked to the movable shaft I, and the bellows B There is a risk of damage or deterioration of airtightness.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealed contact device capable of relaxing the impact force applied to the bellows when the contacts are opened.

[0006]

In order to solve the above-mentioned problems, according to a first aspect of the present invention, contacts are accommodated by hermetically sealing the opening face side of a bottomed box type container body with a sealing plate. A sealed container having an airtight space for holding, a fixed contact provided with a fixed contact, a movable contact provided with a movable contact that comes in contact with and separated from the fixed contact, and one end is airtightly joined to the sealing plate. A bellows, a movable shaft hermetically linked to the other end of the bellows so that one end protruding from the sealing plate can be moved in the axial direction by being driven from the outside of the sealing container, and is sealed in a direction orthogonal to the movable shaft. The bellows protection frame, which has a flange extending near the plate and is fixed to the movable shaft so as to surround the bellows, and the movable shaft is driven to compress the flange of the bellows protection frame so that the contact contacts. Coil-shaped contact pressure spring that urges the movable contact in the contact direction, and the movable contact In the sealed contact device including a return spring contact is biased in a direction to the separable and a, are the configuration in which the elastic member is disposed between the sealing plate and the flange portion of the bellows protective frame.

According to a second aspect of the present invention, a projecting portion is interposed between at least one of the elastic member and the sealing plate or the flange portion of the bellows protection frame.

According to a third aspect of the present invention, at least one of the flange portion of the sealing plate or the bellows protection frame is
A restricting portion that restricts the position of the elastic member in the direction orthogonal to the movable axis is provided.

According to a fourth aspect of the present invention, the elastic member is configured such that a fitting piece that fits into the bellows protection frame is extended in parallel with the movable shaft.

[0010]

According to the first aspect of the present invention, when the movable contact is pushed back by the urging force of the return spring when the contacts are separated, the bellows protection frame is also moved by the inertial force through the contact spring. However, since the elastic member is arranged between the sealing plate and the collar portion of the bellows protection frame which are located close to each other, the collar portion of the bellows protection frame is cushioned by the elastic member. The impact force applied to the bellows is relieved because it is collided with the sealing plate.

According to the second aspect of the invention, the elastic member collides with the flange of the sealing plate or the bellows protection frame via the projection, so that the cushioning force of the elastic member becomes large and the bellows increases. The impact force applied to is further alleviated.

Further, according to the third aspect of the present invention, the regulating portion provided on at least one of the flange portion of the sealing plate or the bellows protective frame regulates the position of the elastic member in the direction orthogonal to the movable axis. The elastic member does not move due to vibrations or the like to prevent the operation of the bellows.

According to the fourth aspect of the invention, since the fitting piece extending parallel to the movable shaft and provided on the elastic member is fitted to the bellows protection frame, the elastic member also moves due to vibration or the like. Does not interfere with the operation of the bellows.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a sealed container, which is a container body 2 having a bottomed box shape with one surface opened by a heat-resistant material such as ceramic, and a thin metal cylinder provided with corrugated folds to form a bellows shape. The formed bellows 3, a sealing plate 4 having a through hole 4a in the center and a ventilation hole 4b at an appropriate place, a bellows retainer 5 and the like constitute an airtight space.

More specifically, in the container body 2, a flat insulating plate 7 made of a heat-resistant material such as ceramic is fitted to a step portion 2b provided one step lower inside the opening surface peripheral edge portion 2a. A sealing plate 4 formed of 42 alloy or the like covering the insulating plate 7 is airtightly bonded to the end surface of the peripheral edge portion 2a of the opening surface of the container body 2. At this time, the sealing plate 4 and the insulating plate 7
The through hole 4a and a through hole 7a having a diameter larger than that of the through hole 4a are respectively provided in the center of the through holes 4a and 7a.
So that the bellows 3 is hermetically sealed, the bellows 3 is hermetically joined to the movable plate 11 described later through the sealing plate 4 with one end sandwiched by the bellows retainer 5 and the long cylindrical cap 3a fitted with the other end. .

In this way, the airtight space of the sealed container 1 is formed, and an electrically insulating gas such as hydrogen gas is enclosed from the vent hole at a pressure of, for example, about 2 atm, and then the vent hole is formed. Are sealed.

Reference numerals 8 and 8 denote two fixed contacts, which are formed by bending a copper plate material into a substantially L shape, and fixed contacts 8a are fixed to the outside of one of the fixed contacts, respectively, and are made of ceramics. One side is supported by an insulating support member 9 formed of a heat resistant material.

Reference numeral 10 denotes a movable contact, which is formed of a copper-based plate material into a substantially flat plate shape, and has movable contacts 10a, 10a provided at both ends thereof at intervals allowing contact with and separation from the fixed contacts 8a, 8a.

Reference numeral 11 denotes a movable shaft, one end 11a of which protrudes from the through hole 4a of the sealing plate 4 and the other end 11b of which is fitted so as to surround the movable contact 10 and a bellows protection frame 13 described later. It is fixed to the bottom. Also bellows
Long cylindrical drive cap 3a with the other end of 3 hermetically joined
Is fitted on the movable shaft 11 through the through hole 4a of the sealing plate 4 and the through hole 7a of the insulating plate 7, and then caulked by a recess 11a provided on the outer periphery of the movable shaft 11 in the middle in the longitudinal direction. That is,
The movable shaft 11 is airtightly bonded and fixed to the other end of the bellows 3 via the drive cap 3a.

Reference numeral 13 is a bellows protection frame, which is made of a metal material.
The movable shaft 11 is formed in a cylindrical shape with a bottom and has a flange 13a extending outside the opening, and by fixing the bottom to the other end 11b of the movable shaft 11 as described above, The bellows 3 is coaxially surrounded, and the collar portion 13a is arranged so as to extend inside the through hole 7a of the insulating plate 7 and in the direction orthogonal to the movable shaft 11 near the sealing plate 4. Set up.

Reference numeral 14 denotes an elastic member, which is made of an elastic material such as rubber and is formed in a disk shape having a through hole 14a having an inner diameter larger than the outer peripheral diameter of the bellows 3 in the center thereof. It is fitted inside the collar 7a and between the collar 13a and the sealing plate 4.

Reference numeral 15 is a contact pressure spring, which is formed in a coil shape and is compression-suspended between the flange portion 13a of the bellows protection frame 13 and a contact pressure spring receiver 15a fixed to the movable contact 10. The movable contact 10 is driven in the axial direction of the movable shaft 11 via the spring 15.

Reference numeral 16 is a return spring, which is formed in a coil shape and is inserted into the center hole 9a of the insulating support member 9 so that the return spring 16 can guide the cylindrical return spring frame 16a into the center hole 9a. Be fitted. While the return spring frame 16a is positioned by inserting the tip of the movable contact holder 12 into the upper hole, the return force of the return spring 16 pushes up the movable contact 10 in the direction in which the contacts are separated. There is.

The operation of this device is as shown in FIG.
When one end 11a of the movable shaft 11 protruding from the through hole 4a of 4 is pressed and driven by a driving member such as an electromagnet from the outside of the sealed container 1, the movable contact 10 comes into contact with the flange 13a of the bellows protection frame 13. Driven by the contact pressure spring 15, the movable contacts 10a, 10a
Contacts the fixed contacts 8a, 8a. When one end 11a of the movable shaft 11 is further pressed and driven thereafter, the movable contact 10 cannot move, whereas the bellows protection frame 13 fixed to the movable shaft 11 is fixed.
Moves to compress the contact pressure spring 15, and the force becomes contact pressure. Then, when the movable shaft 11 is no longer driven to be pressed, the return spring 16 pushes the movable contact 10 back to restore the original state. Then, the arc generated between the contacts at the time of restoration is extended by the magnetic field of the magnetic means (not shown) and extinguished.

In such a sealed contact device, when the movable contact 10 is pushed back by the urging force of the return spring 16 when the contacts are separated, the bellows protection frame 13 and the contact spring 15 are also pushed by the inertial force. Although it is accelerated in the same direction via, the elastic member 14 is disposed between the sealing plate 4 and the flange portion 13a of the bellows protection frame 13 which are located close to each other, and therefore the bellows protection frame 13 The collar portion 13a is buffered via the elastic member 14 and is a sealing plate.
Since it collides with 4, the impact force applied to the bellows 3 is relaxed, and the bellows 3 is not damaged or the airtightness is not deteriorated.

Next, a second embodiment will be described below with reference to FIG. This is different from the first embodiment only in part of the shape of the sealing plate 4. That is, in the sealing plate 4, a plurality of protrusions 4b capable of contacting the elastic member 14 are projected from the back side surface at positions symmetrical to the movable shaft 11.

In this sealed contact device, the bellows protection frame 13 is urged by the urging force of the return spring 16 when the contacts are opened.
When the collar portion 13a of the above collides with the sealing plate 4 through the elastic member 14, the sealing plate 4 and the elastic member 14 do not collide with each other on a flat surface as in the first embodiment, but rather with the sealing surface. Since the protrusion 4b provided on the plate 4 contacts the elastic member 14, the cushioning force of the elastic member 14 increases, and the impact force applied to the bellows 3 is further alleviated.

A modification of the second embodiment is shown in FIGS. 3 and 4.
Shown in. FIG. 3 shows a plurality of protrusions that can contact the elastic member 14.
13b is provided on the collar portion 13a of the bellows protection frame 13,
Further, FIG. 4 shows a plurality of protrusions 14b, 14c on both sides of the elastic member 14, which are capable of contacting the sealing plate 4 and the flange 13a of the bellows protection frame 13.
Are provided respectively. So these things are
Similar to the second embodiment, at least one of the elastic member 14 and the sealing plate 4 or the flange portion 13a of the bellows protection frame 13 is
Since the respective projections are interposed, the buffering force of the elastic member 14 at the time of opening the contact also becomes large.

Next, a third embodiment will be described below with reference to FIG. This is different from the first embodiment only in part of the shape of the sealing plate 4. That is, in the sealing plate 4, a plurality of restricting portions 4b whose inner surface is positioned to fit the outer peripheral end of the disk-shaped elastic member 14 are projected at positions symmetrical with respect to the movable shaft 11.

In this sealed contact device, the sealing plate 4
Since the restricting portion 4c provided on the position restricts the position of the elastic member 14 in the direction orthogonal to the movable shaft 11, the elastic member 14 does not move due to vibration or the like and interfere with the operation of the bellows 3.

FIG. 6 shows a modification of the third embodiment.
This is an elastic member in the direction orthogonal to the movable shaft 11.
A regulating portion 13c for regulating the position of 14 is provided at the end of the collar portion 13a of the bellows protection frame 13, and the action and effect thereof are the third.
It is similar to the embodiment.

Next, a fourth embodiment will be described below with reference to FIG. This is different only in the shape of the elastic member 14 from the first embodiment. That is, the disc-shaped elastic member 14 has a fitting piece 14d that fits on the inner peripheral surface of the opening of the bellows protection frame 13 having a cylindrical shape and has a movable shaft on the inner peripheral edge of the central through hole 14a.
It is formed to extend parallel to 11.

In such a sealed contact device, the elastic member
Since the fitting piece 14d is fitted to the inner peripheral surface of the opening of the bellows protection frame 13 and the position of the fitting piece 14d in the direction orthogonal to the movable shaft 11 is regulated, the movement of the fitting piece 14d may be hindered by movements such as vibrations. Nothing.

FIG. 8 shows a modification of the fourth embodiment.
The disk-shaped elastic member 14 has a fitting piece 14e that fits on the outer peripheral end surface of the flange portion 13a of the rose protection frame 13 and extends parallel to the movable shaft 11 around the outer peripheral edge of the fitting piece 14e. The effect is similar to that of the fourth embodiment.

[0036]

According to the first aspect of the present invention, when the movable contact is pushed back by the urging force of the return spring when the contacts are separated, the bellows protection frame also receives the same force through the contact spring due to its inertial force. However, since the elastic member is arranged between the sealing plate and the collar portion of the bellows protection frame which are located close to each other, the collar portion of the bellows protection frame is cushioned by the elastic member. The impact force applied to the bellows is relieved because it is collided with the sealing plate.

According to the second aspect of the invention, since the elastic member collides with the flange of the sealing plate or the bellows protection frame via the protrusion, the buffering force of the elastic member becomes large and is applied to the bellows. The impact force is further alleviated.

According to the third aspect of the present invention, since the regulating portion provided on at least one of the flange portion of the sealing plate or the bellows protection frame regulates the position of the elastic member in the direction orthogonal to the movable axis, the elastic member is elastic. The member does not move due to vibration or the like to prevent the operation of the bellows.

Further, according to the present invention, since the fitting piece extending in parallel to the movable shaft and provided on the elastic member is fitted to the bellows protection frame, the elastic member also moves due to vibration or the like and the bellows is also moved. Does not interfere with the operation of.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a first embodiment of the present invention.

FIG. 2 is a front sectional view showing a main part of a second embodiment of the present invention.

FIG. 3 is a front sectional view showing a modification example of the above.

FIG. 4 is a front sectional view showing a modification example of the above.

FIG. 5 is a front sectional view showing an essential part of a third embodiment of the present invention.

FIG. 6 is a front sectional view showing a modification example of the above.

FIG. 7 is a front sectional view showing an essential part of a fourth embodiment of the present invention.

FIG. 8 is a front sectional view showing a modification example of the above.

FIG. 9 is a front sectional view showing a conventional example.

[Explanation of symbols]

 1 Sealing container 2 Container body 3 Bellows 4 Sealing plate 4b Projection part 4c Control part 8 Fixed contact 8a Fixed contact 10 Movable contact 10a Movable contact 11 Movable shaft 11a One end 11b The other end 13 Bellows protection frame 13a Collar part 13b Protrusion 13c Regulator 14 Elastic member 14b Projection 14c Projection 14d Fitting piece 14e Fitting piece 15 Contact spring 16 Return spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kosei Kimura 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works Co., Ltd.

Claims (4)

[Claims] 1. A sealed container in which an opening side of a bottomed box type container body is hermetically sealed with a sealing plate to form an airtight space for storing contacts, and a fixed contact provided with fixed contacts. A child, a movable contact provided with a movable contact for contact with and separated from a fixed contact, a bellows one end of which is hermetically joined to a sealing plate, and one end of which protrudes from the sealing plate is driven from the outside of the sealing container. A movable shaft which is airtightly linked to the other end of the bellows so as to be movable in the axial direction, and a flange portion which extends in the direction orthogonal to the movable shaft near the sealing plate so as to surround the bellows. A bellows protection frame fixed to the coil, a coil-shaped contact pressure spring that biases the movable contactor in the direction in which the contact is abutted by being compressed by the flange portion of the bellows protection frame when the movable shaft is driven, and the movable contactor. In a sealed contact device equipped with a return spring for urging the contact in the direction of opening the contact. A sealed contact device, wherein an elastic member is disposed between the sealing plate and the flange portion of the bellows protection frame. 2. The sealed contact device according to claim 1, wherein at least one of the elastic member and the flange of the sealing plate or the bellows protection frame is provided with a protrusion. . 3. The flange portion of the sealing plate or the bellows protection frame is provided with at least one regulating portion for regulating the position of the elastic member in the direction orthogonal to the movable axis. The sealed contact device according to claim 1. 4. The sealed contact device according to claim 1, wherein the elastic member has a fitting piece that fits into the bellows protection frame and extends in parallel with the movable shaft.