JPH05151870A - Sealed contact device - Google Patents

Abstract

PURPOSE:To prevent a bellows from causing its largeness in size even when a contact is changed into large capacity without flowing a current in a movable shaft by connecting a movable contactor to the bellows-provided movable shaft through a spring relating to a fixed contactor juxtaposed in a sealed vessel. CONSTITUTION:Two fixed contactors 8, 8 of providing fixed contacts 9, 9 are juxtaposed in a sealed vessel 1 of containing a bellows 2 sealing electric insulating gas G filled, and a movable contactor 13 of providing movable contacts 14, 14 is connected to a movable shaft 17, air-tightly fixed to the bellows 2, through a contact pressure spring frame 15. Accordingly, when a cap 21 is pressed by an electromagnet device or the like, the contactor 13 is lowered through the shaft 17 and placed in a contact condition of a contact, but since no current flows in the shaft 17 surrounded by the bellows 2, largeness in size of the shaft 17 and the bellows 2 is not necessary even when electrification capacity is increased, and resetting force of the bellows can be decreased and stabilized. Arc extinguishing performance can be improved by forming both end parts of both the contactors into an arc horn shape.

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 power load relays, electromagnetic switches and the like.

[0002]

2. Description of the Related Art The applicant of the present application has studied this type of sealed contact device for many years and has made various proposals. An example of a typical configuration is shown in FIGS. 6 and 7. is there.
In the figure, A is a sealed container that has a contact housing chamber and a bellows housing chamber to form an airtight space together with a bellows B, G is an electrically insulating gas sealed in the sealed container A at a pressure of about 2 atmospheres, and C Is a fixed contact provided with a fixed contact D in the contact housing chamber, and E is a movable contact F that comes into contact with and separates from the fixed contact D at one end and the middle part is joined to the bellows B and the other end is sealed. It is a movable contactor protruding outside the container.

Specifically, the sealed container A is a rectangular tube-shaped container body Aa, a yoke Ab also serving as a bottom plate, and a ventilation pipe A also serving as a conductive path.
c, an upper lid Ad, a bellows protection cylinder Ae, a bellows retainer Af, etc. A conducting wire Ag is connected to the ventilation pipe Ac, and permanent magnets Ah are arranged opposite to each other at both ends of the yoke Ab. The terminal member H is fixed to the upper end of the movable contact E, and the conducting wire Hg is connected thereto. A bearing J that guides the movable contact F is mounted in the center hole of the bellows retainer Af, and this bearing J is positioned and held by a bearing retainer K fixed to the bellows retainer Af. A coil-shaped return spring L is compression-suspended between the terminal member H and the bearing retainer K, and biases the movable contact E in a direction away from the fixed contact C. This movable contact E is
Normally, it contacts the stopper M and is stationary. Terminal member H
A cap N is fitted on the upper end of the movable contactor E, and the upper end is pressed by a driving member (not shown) such as an electromagnet device.

In such a sealed contact device, normally, the movable contact E is lifted by the enclosed gas pressure or the return spring L and the contact is in a separated state. When a driving member such as an electromagnet device presses the cap N in this state, the movable contactor E moves down against the pressure of the enclosed gas and the spring force of the return spring L, and eventually comes into contact contact state. Next, when the driving member such as the electromagnet device is returned to stop pressing the cap N, the movable contact E
Is lifted by the enclosed gas pressure and the return spring L, and the contact is opened again. During this contact opening operation, an arc is generated between both contacts, but this arc is extinguished by the magnetic blowout action by the Lorentz force generated together with the cooling capacity of the enclosed gas G and the magnetic field of the permanent magnet Ah. The long life and reliability can be improved.

[0005]

The above-mentioned sealed contact device has been able to make a great contribution in terms of the long life of the contact and the improvement of reliability. It is necessary to increase the cross-sectional area of the child, more specifically, the shaft portion surrounded by the bellows, which increases the inner and outer diameters of the bellows. Return force by internal and external pressure difference of the sealing container, [pi × {(Bellows OD + bellows inner diameter) ^2/16} × pressure difference, in because sought, inner and outer diameters of the bellows increases when the greater its return force. Further, the atmospheric pressure difference also changes according to the change of the ambient temperature, but in this case also, the larger the bellows, the larger the fluctuation range of the restoring force. As the restoring force of the bellows increases as described above, the driving force of a driving member such as an electromagnet device must be increased for reliable contact contact operation, and a relay or the like equipped with the driving member also increases in size.

Further, the movement of the terminal member and the conductive wire in accordance with the operation of the movable contact causes a malfunction, and also causes an increase in size in order to secure an operation space.

The present invention has been made in view of the above circumstances, and an object thereof is to seal the bellows with a small restoring force even when the energizing capacity of the contact is increased, so that the bellows does not increase in size. To provide a contact device.

[0008]

In order to solve such a problem, a sealed contact device of the present invention is a sealed container having a contact housing chamber and a bellows housing chamber to form an airtight space with the bellows, and a sealed container. A movable contactor having an electrically insulating gas sealed inside, fixed contacts arranged in parallel in the contact chamber with fixed contacts at the ends, and movable contacts at both ends contacting and separating from each fixed contact. , One end is connected to the movable contactor, the intermediate part is joined to the bellows, and the other end is electrically connected to the fixed contactor and the movable shaft protruding outside the sealing container and protrudes outside the sealing container. A sealed contact device having a fixed electrode.

Further, it is preferable that both ends of both the contacts have an arc horn shape. It is also preferable that the fixed and movable contacts are made of molybdenum.

Further, it is preferable that the movable contact and the movable shaft are connected via a contact pressure spring. Further, it is preferable that the fixed electrode is airtightly fixed to the sealed container via the external force relaxing member.

[0011]

According to this structure, since no current flows through the movable shaft surrounded by the bellows, it is not necessary to enlarge the movable shaft and hence the bellows even if the current-carrying capacity is increased, and the restoring force of the bellows is small and stable. To be made.

If both ends of both contacts are arc horn-shaped, the arc easily extends and the extinguishing performance is further improved.

When the fixed and movable contacts are made of molybdenum, the viscosity of the molybdenum is greater than that of tungsten and the like, so that the arc horn-shaped portion can be covered when the movable contacts are press-formed. ..

Further, when the movable contactor and the movable shaft are connected through the contact pressure spring frame, even if there are two contact contact / separation portions and there is some variation in the contact gap, a substantially uniform contact state is obtained. As a result, the contact pressure is stabilized and variations in the stroke of the drive member can be absorbed.

Further, if the fixed electrode is airtightly fixed to the sealed container via the external force mitigating member, the sealed container becomes less likely to be damaged.

[0016]

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

Reference numeral 1 denotes a sealed container, which has a contact housing chamber 1a and a bellows housing chamber 1b, and forms an airtight space together with the bellows 2. Specifically, the bellows 2, the container body 3, and the ventilation pipe are provided.
4, upper cover 5, bellows protection tube 6, bellows holder 7 and the like.

The container body 3 is made of a heat-resistant insulating material such as ceramics and is formed into a generally rectangular cylinder with a bottom. Vent in the center of the bottom
3a, a withstanding voltage rib 3b is provided around it, and through holes 3c, 3c for fixed electrodes are provided outside thereof. Further, the open side end surface of the tubular portion is a stepped portion 3d inwardly lowered.

The ventilation pipe 4 is joined to the outer surface of the bottom in a state of communicating with the ventilation hole 3a of the container body 3, and after filling the electrically insulating gas G such as hydrogen gas at high pressure (for example, 2 atm). , Crimp and close.

The upper lid 5 is made of 42 alloy or the like and is a container body.
Close the open end of 3. Specifically, first, a square-shaped joining auxiliary member 5a made of 42 alloy or the like is brazed and joined to the open end surface of the container body 3, and then the upper lid 5 is laser-welded to the joining auxiliary member 5a together with a movable shaft and the like described later. .. Top lid 5
A bearing 5b made of ethylene difluoride or the like is mounted in the center of the so as to movably support a movable shaft described later. An insulating plate 5c made of ceramic or the like is placed on the step 3d to insulate the upper lid 5.

The bellows protection cylinder 6 is formed of a metal material into a cylindrical shape with a flange, and the end surface on the side having the flange coaxial with the bearing 5b is brazed to the upper lid 5. Bellows holder 7
Made of a metallic material in a cylindrical shape with a short axial length,
The bellows protection cylinder 6 is brazed to the upper end surface of the bellows protection cylinder 6 so that one end of the bellows, which will be described later, is sandwiched therebetween. A bearing 7b that movably supports a movable shaft, which will be described later, is mounted in the center. The bellows 2 is formed into a bellows shape with a thin metal plate material, one end of which is sandwiched between the bellows protective cylinder 6 and the bellows retainer 7 as described above, and the other end of which is hermetically fixed to a movable shaft described later. ..

Therefore, the space formed by the container body 3 and the upper lid 5 becomes the contact receiving chamber 1a, and the space formed by the upper lid 5, the bellows protection cylinder 6 and the bellows retainer 7 becomes the bellows receiving chamber 1b.

Numerals 8 and 8 are fixed contacts, which are basically copper-shaped plate members, which are basically formed by a lower horizontal piece 8a, a vertical piece 8b, and an upper horizontal piece 8c in a U shape, and are not fixed. Fixed contacts 9 and 9 are provided at the ends of the horizontal piece 8c. On the lower horizontal piece 8a, female screw 8d
Is engraved. The fixed contacts 8 and 8 of this embodiment are provided with extension pieces 8e and 8e, which are extended from the upper horizontal piece 8c at the end on the side where the fixed contacts 9 and 9 are provided and are bent by about 45 degrees. .. The fixed contacts 9 and 9 are preferably made of molybdenum as a contact material, and fixed to the ends of the fixed contacts 8 and 8 by pressure contact. The contact material needs to have a high melting point, and thus tungsten may be used. However, by using molybdenum having a high melting point and high viscosity, the tip of the end is covered with molybdenum during the pressure contact fixing process. be able to.

Numerals 10 and 10 are fixed electrodes, which are made of a metal material such as oxygen-free copper and have a rod shape which can be inserted into the through holes 3c and 3c, have a large diameter portion 10a in the middle portion, and have a male screw 10d Is engraved. 11, 11 are seat springs, 12 and 12 are external force relaxation members made of copper-based material and having a U-shaped cross section. The seat springs 11 and 11 are provided between the container body 3 and the fixed contact 8 and the stress relaxation member 12 The male screw 10d of the fixed electrode 10 is screwed onto the female screw 10d of the fixed contact 8 in a state where the and 12, are arranged between the container body 3 and the large diameter portion 10a. As a result, the two fixed contacts 8 and 8 are attracted to the fixed electrodes 10 and 10 and pressed by the seat springs 11 and 11, so that they are juxtaposed in the contact housing chamber 1a with the withstanding voltage rib 3b sandwiched between them. It The external force mitigating member 12 and the container body 3, and the external force mitigating member 12 and the large-diameter portion 10a are brazed to each other. Member 12
Absorbs and prevents damage to the brazed joint.

Reference numeral 13 denotes a movable contact, which is formed of a copper-based plate material in the shape of a long plate and has movable contacts 14 and 14 at its both ends which come into contact with and separate from the fixed contacts 9 and 9, respectively. The movable contact 13 of this embodiment is
Extension piece 13e with both ends further extended and bent about 45 degrees,
13e are lined up. As a result, both contacts 8 and 13 of this embodiment have an arc horn shape. Movable contact 14,1
4, preferably molybdenum is used as a contact material, and is fixed by pressure contact to the end of the movable contact 13. Therefore, the movable contact 13
Also, it is possible to cover the tip of the end portion with molybdenum during the pressure fixing process. The movable contact 13 is attached to a contact pressure spring frame described later.

As shown in FIG. 2, reference numeral 15 is a contact pressure spring frame, which is formed in a U shape by the opposing pieces 15a, 15a and the connecting piece 15b, and further protrudes inward from the tips of the opposing pieces 15a, 15a. Piece 15c, 15c
Are installed in series. The distance between the two facing pieces 15a, 15a is a movable contact.
The width is slightly larger than the width of 13, and the end face spacing of the protruding pieces 15c, 15c is smaller than the width of the movable contactor 13. The above-mentioned movable contact 13 is inserted into this contact pressure spring frame 15, and is attached to the contact pressure spring frame 15 while being biased by the contact pressure spring 16. The contact pressure spring frame 15 is fixed to a movable shaft described later. Even if there is some variation in the gap between the two contact points, a substantially uniform contact state is obtained and the contact pressure is stable, and even if the stroke of the drive member varies, it can be absorbed.

Reference numeral 17 denotes a movable shaft, which is movably supported by bearings 5b and 7b in the form of a long cylinder made of a metal material such as oxygen-free copper, and one end thereof is fixed to the contact pressure spring frame 15. As a result, it is connected to the movable contactor 13, the middle portion is airtightly fixed to the other end of the bellows 2, and the other end projects outside the sealing container 1. Since the movable shaft 17 is airtightly fixed to the bellows 2, the sealing container 1 causes the electrically insulating gas G to have a high pressure (for example, 2
It becomes a completely airtight state enclosed with (atmospheric pressure).

Reference numeral 18 denotes a terminal member, which is fixed to the upper end of the movable shaft 17 and further connected to a conductor wire (not shown). 19
Is a coiled return spring, which holds the bellows holder 7 and the terminal member.
It is compression-suspended between 18 and biases the movable shaft 17 in the direction of moving away from the fixed contactor 8. This movable shaft 17
For example, it comes into contact with a stopper 20 fixed to the bellows protection cylinder 6 and stands still. Reference numeral 21 denotes a cap, which is fitted to the upper end portions of the terminal member 18 and the movable shaft 17, and the movable shaft 17 is driven by pressing the upper end portion with a driving member (not shown) such as an electromagnet device. It

In such a sealed contact device, normally, when the enclosed gas pressure and the spring force of the return spring 19 and the spring force of the bellows 2 are in equilibrium, both contacts 9 and 14 have a predetermined contact separation state. It is in. When a driving member such as an electromagnet device pushes the cap 21 in this state, the movable contact 17 descends against the pressure of the enclosed gas and the spring force of the return spring 19, and eventually comes into contact contact state. Next, when the driving member such as the electromagnet device is restored and the cap 21 is no longer pressed, the movable contact 17 is lifted by the enclosed gas pressure and the return spring 19 to be in the contact open state again. This contact opening / closing operation has a so-called two-point breaking contact structure, in which an arc is generated between the two contacts.
This arc is extinguished by the cooling capacity of the enclosed gas G and the generation of high arc voltage by the arc horn-shaped part. The arc moves to the arc horn-shaped portion by the Lorentz force due to the self-induced magnetic field and is elongated.However, when the permanent magnets are arranged facing each other like the conventional one, the magnetic field in the direction perpendicular to the paper surface acts. And move more quickly, and thus a higher arc voltage is generated more quickly. In addition, in the case of this embodiment, since the arc horn-shaped portion is covered with molybdenum which is a high melting point material, movement and extension of the arc are promoted and damage to both contacts 8 and 13 can be reduced. Further, since the movable contact 13 and the movable shaft 17 are connected via the contact pressure spring frame 15, even if there is some variation in the contact gap between the two locations, a substantially uniform contact state can be obtained and the contact pressure can be increased. It is stable, and even if the stroke of the drive member varies, it can be absorbed.

FIG. 3 shows a modification of the fixed contact 8, the fixed electrode 10 and the external force relaxing member 12, in which the seat spring 11 of the previous embodiment is omitted and the fixed contact 8 and the fixed electrode 10 are screwed together. It is fixed. That is, the position of the large-diameter portion 10a of the fixed electrode 10 is moved to the end side, the lower lateral piece 8a of the fixed contact 8 is placed on this and caulked, and it is passed through the through holes 3c, 3c. The external force relaxing member 12 is formed into an L-shaped cross section, and the external force relaxing member 12 and the container body 3 are brazed to the external force relaxing member 12 and the fixed electrode 10. This product can reduce the number of parts.

FIG. 4 shows a modification of the sealed container 1, in particular, the partial structure for enclosing the electrically insulating gas G, in which the ventilation pipe 4 is brazed to the upper lid 5. That is, the container body 3 does not have the vent holes 3a, and the upper lid 5 and the insulating plate 5c have the vent holes 5d and 5e. With this, the shape of the container body 3 is simplified and the ventilation pipe 4 is easily joined.

FIG. 5 shows a modified example of the contacts 9, 14 in which the arc horn-shaped portion is not covered with the contact material as in the case of the previous embodiment.

It should be noted that both ends of both contacts are arc horn-shaped, both ends of both contacts are arc horn-shaped, fixed and movable contacts are made of molybdenum, movable contacts and movable contacts The connection to the shaft via the contact pressure spring frame, the airtight fixing of the fixed electrode to the sealed container via the external force relaxation member, and the like may be appropriately selected and implemented.

[0034]

In the sealed contact device of the present invention, since no current flows through the movable shaft surrounded by the bellows, it is not necessary to increase the size of the movable shaft and therefore the bellows even if the current carrying capacity is increased. The restoring force is small and stable.

If both ends of both contacts are arc horn-shaped, the arc easily extends and the extinguishing performance is further improved.

When the fixed and movable contacts are made of molybdenum, the viscosity of the molybdenum is higher than that of tungsten and the like, so that the arc horn-shaped portion can be covered when the movable contacts are press-contacted to the movable contact. ..

Further, when the movable contactor and the movable shaft are connected via the contact pressure spring frame, even if there are two contact contact / separation portions and there is some variation in the contact gap, a substantially uniform contact state is obtained. As a result, the contact pressure is stabilized and variations in the stroke of the drive member can be absorbed.

Furthermore, if the fixed electrode is airtightly fixed to the sealed container via the external force relaxing member, the sealed container becomes more difficult to be damaged.

Therefore, even if the energizing capacity of the contact is increased, the restoring force of the bellows is small and stabilized, and a sealed contact device that does not cause an increase in size can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the contact pressure spring frame.

FIG. 3 is a vertical cross-sectional view showing a modified example of a fixed contact, a fixed electrode, and an external force relaxing member.

FIG. 4 is a vertical cross-sectional view showing a modified example of a partially enclosed structure of an electrically insulating gas.

FIG. 5 is a vertical cross-sectional view showing a modified example of both fixed and movable contacts.

FIG. 6 is a vertical sectional view showing a conventional example.

FIG. 7 is a vertical cross-sectional view seen from a direction different by 90 °.

[Explanation of symbols]

 1 Sealing container 1a Sealing container contact chamber 1b Sealing container bellows chamber 2 Bellows 3 Container body 4 Vent pipe 5 Top cover 6 Bellows protective cylinder 7 Bellows holder 8 Fixed contact 8e Fixed contact extension piece 9 Fixed Contact 10 Fixed electrode 12 External force absorbing member 13 Movable contact 13e Extension piece of movable contact 14 Movable contact 15 Contact pressure spring frame 16 Contact pressure spring 17 Moveable axis G Electrically insulating gas

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[Procedure amendment]

[Submission date] May 8, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

The bellows protection cylinder 6 is formed of a metal material into a cylindrical shape with a flange, and the end surface on the side having the flange coaxial with the bearing 5b is brazed to the upper lid 5. Bellows holder 7
Made of a metallic material in a cylindrical shape with a short axial length,
The bellows protection cylinder 6 is joined to the upper end surface of the bellows protection cylinder 6 by , for example, laser welding so as to sandwich one end of the bellows described later. A bearing 7b that movably supports a movable shaft, which will be described later, is mounted in the center. The bellows 2 is formed into a bellows shape with a thin metal plate material, one end of which is sandwiched between the bellows protection cylinder 6 and the bellows retainer 7 and the other end of which is hermetically fixed to a movable shaft described later. ..

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Reference numeral 17 denotes a movable shaft, which is movably supported by bearings 5b and 7b in the form of a long cylinder made of a metallic material such as stainless steel , and one end thereof is fixed to the contact pressure spring frame 15.
Thereby, it is connected to the movable contactor 13, the middle part is airtightly fixed to the other end of the bellows 2, and the other end projects outside the sealing container 1. When the movable shaft 17 is airtightly fixed to the bellows 2, the sealed container 1 can prevent the electrically insulating gas G from being pressurized.
It becomes completely airtight by enclosing it (for example, 2 atm).

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

[0028] 18 in the terminal member, is secured <br/> to the upper end of the movable shaft 17. 19 is a coil-shaped return spring, which holds the bellows 7
The movable shaft 17 is spring-biased in a direction in which the movable shaft 17 is separated from the fixed contactor 8 by being compression-suspended between the fixed contactor 8 and the terminal member 18. The movable shaft 17 stands still by abutting a stopper 20 fixed to the bellows protection cylinder 6, for example. Reference numeral 21 denotes a cap, which is fitted to the upper ends of the terminal member 18 and the movable shaft 17, and the movable shaft 17 is driven by pressing the upper end with a driving member (not shown) such as an electromagnet device. It

Claims (5)

[Claims] 1. A sealed container having a contact housing chamber and a bellows housing chamber to form an airtight space together with the bellows, an electrically insulating gas sealed in the sealed container, and a fixed contact provided at an end of the sealed container. Fixed contactors arranged side by side in the storage chamber, and movable contactors provided with movable contacts that come into contact with and separate from each fixed contact at both ends.
One end is connected to the movable contact, the middle part is joined to the bellows, and the other end is a movable shaft protruding outside the sealing container, and a fixed electrode electrically connected to the fixed contact and protruding outside the sealing container. A sealed contact device having: 2. The sealed contact device according to claim 1, wherein both ends of the fixed and movable contacts have arc horn shapes. 3. The sealed contact device according to claim 1, wherein the fixed and movable contacts are made of molybdenum. 4. The sealed contact device according to claim 1, wherein the movable contact and the movable shaft are connected via a contact pressure spring. 5. The sealed contact device according to claim 1, wherein the fixed electrode is airtightly fixed to the sealed container via an external force relaxing member.