JPH0745852Y2 - Sealed contact device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed contact device, and more particularly to a sealed contact device that is preferably implemented in a power load switching mechanism such as an electrode switching relay.

2. Description of the Related Art In general, contact devices used for power load switching mechanisms with large load currents suffer from contact wear and welding due to arcs when the load current, especially DC current, is interrupted, which reduces the reliability and life of the device. There was a problem.

In order to solve such a problem, an insulating gas such as hydrogen gas is sealed in a high pressure, and a contact is opened and closed in a hermetically sealed container, so that the insulating gas has a cooling ability and a sealing container. A sealed contact device having a structure in which a generated arc is quickly extinguished by an arc blowout action of a permanent magnet arranged outside is conceivable.

FIG. 4 is a sectional view showing the structure of such a sealed contact device 1 of a conventional example, and FIG. 5 is a sectional view taken along the section line V-V in FIG. The configuration and operation of the sealed contact device (hereinafter referred to as the contact device) 1 will be described with reference to FIGS. 4 and 5. The contact device 1 includes, for example, a body portion 2 formed of an insulating material such as ceramics, and end plates 3 and 4 which are fixed by covering both axial end portions of the body portion 2 formed of a metal material. The part 2 and the end plates 3 and 4 form a sealed container 5.

A fixed shaft 6b made of a metal material and having a fixed contact 6a fixed thereto is fitted into a fitting hole 4a provided in one end plate 4 and fixed by caulking or the like to form a fixed electrode 6. A trachea 7 is further connected to the end plate 4, and an insulating gas such as hydrogen gas having a large thermal conductivity from the trachea 7 through a vent hole 4b provided in the end plate 4 prevents an airtight space in the sealed container 5. 8
At a pressure higher than the atmospheric pressure (for example, 2 atmospheric pressure). After that, the trachea 7 is crimped to seal the airtight space 8,
The conductor wire 9 is connected to form a connection terminal 10. The end plate 4 is made of an insulating material such as ceramics,
An insulating member 11 having an insertion hole 11a for the fixed shaft 6b is provided inside the body 2 and the end plate 4 so as to be inscribed therein.

On the surface of the other end plate 3 on the airtight space 8 side, the insulating member
An insulating member 12 made of the same material as 11 is fixed, and insertion holes 3a and 12a provided in the end plate 3 and the insulating member 12, respectively.
The movable contact 13a is made of a metal material and fixed to the tip,
A movable shaft 13b, to which a connecting terminal 13c is formed and a conductor 14 is connected, is inserted through the other end.

The movable contact 13a and the movable shaft 13b integrally form a movable electrode 13, and a cylindrical tube through which the movable shaft 13b penetrates on the outer surface of the end plate 3 at the peripheral edge of the insertion hole 3a. The body 15 is arranged, and surrounds the movable shaft 13b inside the cylindrical body 15, one end of which is the movable shaft 13b, and the other end is the cylindrical body 15 and the bellows pressing plate 1.
A bellows-shaped bellows 16 that is airtightly coupled to the 7 is arranged. As a result, the airtight space 8 in the sealed container 5 is shielded from the outside and hermetically sealed. The bellows pressing plate 17 is provided with a guide cylinder 17a that slidably holds the movable shaft 13b.

The fixed contact 6a and the movable contact 13a are substantially disk-shaped symmetrical with each other, and permanent magnet pieces 18a, 18b are arranged outside the body portion 2 in the thickness direction (left and right direction in FIG. 5) of both. The yoke member 19 is arranged so as to surround it.

In the contact device 1 having such a structure, the movable shaft 13
When b is pressed in the direction indicated by arrow A (downward in FIG. 4) by pressing means (not shown), fixed contact 6a and movable contact 6a
13a comes into contact with and conducts. When the pressing force is removed, the movable shaft 13b receives a force in the direction opposite to the arrow A (upward in FIG. 4) generated on the bellows 16 due to the pressure difference between the inside and outside of the sealed container 5, and the movable contact 13a becomes the fixed contact 6a. And the contacts are cut off. An arc that causes damage to the contact is generated at the time of this interruption, but in the contact device 1, the generated arc is rapidly cooled by the cooling capacity of hydrogen gas sealed in the sealing container 5 at high pressure,
Further, the permanent magnets 18a, 18b arranged outside the sealing container 5 extinguish the arc in a short time by the magnetic blowout action based on the Lorentzer to the arc, so that the life of the contact is extended and the reliability is improved. .

However, such a contact device 1 is excellent in arc extinguishing property, but since the opening force of both contacts at the time of contact disconnection depends on the enclosed gas pressure as described above, the change over time, the influence of ambient temperature or gas leakage. The opening force fluctuates and decreases due to the decrease in the filled gas pressure due to the fixed contact 6a
If the movable contact 13a and the movable contact 13a are not separated from each other and the energized state is maintained, a trouble may occur. In an extreme case, if all the enclosed gas leaks, the above-mentioned opening force does not occur at all, and contact breakage becomes impossible. Further, since the opening force is all transmitted by the bellows 16, it causes fatigue of the bellows 16 and, in turn, is another cause of shortening the life and reliability of the contact device 1.

In order to solve such a problem, for example, the pressing means may be provided with an opening force in the direction opposite to the pressing force, and when the contacts are closed, the opening force may separate the two contacts.

6 is a sectional view of the contact device 1a which is the basis of the present invention, and FIG. 7 is a sectional view taken along the section line VII-VII of FIG. The contact device 1a will be described with reference to these drawings. The contact device 1a is similar to the contact device 1 of the conventional example, and the same reference numerals are given to corresponding parts. In this configuration example, in the contact device 1, the guide cylinder 17a and the movable shaft 13b are surrounded, and a cylindrical compression coil spring (hereinafter, referred to as a coil spring) 20 is provided between the bellows pressing plate 17 and the connection terminal 13c.
It is characterized by the provision of. Ie coil spring 20
Therefore, in addition to the opening force of the bellows 16, a new opening force is used together. That is, it is possible to prevent a decrease in the opening force between the contacts 13a and 6a due to fluctuations in the filled gas pressure, and to eliminate anxiety about reliability when the contact cannot be cut off due to leakage of the filled gas.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the contact device 1a having the above-described configuration example, by mounting the coil spring 20, both contacts 13a,
The length of the drive shaft 13b protruding outwardly from the bellows pressing plate 17 when contacting 6a needs to be at least longer than the axial length when the coil spring 20 is compressed. . That is, since it is necessary to lengthen the movable shaft 13b, the weight of the entire movable electrode 13b increases, the contact device 1a becomes larger, and the increase in weight decreases the opening speed, which occurs. There is a problem that the arc is not extinguished promptly, which causes the contact life to be greatly reduced.

An object of the present invention is to solve the above-mentioned technical problems and to provide a sealed contact device which can be downsized and lightweight and can have a long life.

MEANS FOR SOLVING THE PROBLEMS The present invention is provided with (a) a sealed container 25 in which an airtight space is formed, and (b) a substantially disk-shaped fixing at a tip of a fixed shaft 26b fixed in the sealed container 25. A fixed electrode 26 provided with a contact 26a, and (c) a movable contact 33a having a substantially disk shape, which can freely separate from and separate from the peripheral surface of the fixed contact 26a, is provided at the tip of the movable shaft 33b. The movable electrode 33, which is disposed so that the thickness directions of both 33a coincide with each other, and (d) is fixed to the sealing container 25 by projecting outward,
(B) A cylindrical body 35 into which 33b is inserted, and (e) a movable shaft 33b which is provided in the cylindrical body 35 and which surrounds the movable shaft 33b and has one end fixed to the movable shaft 33b and the other end fixed to the cylindrical body 35. And the movable shaft 33b is inserted into the bellows 36, and the bellows pressing plate 35b is provided at the end of the cylindrical body 35 to which the other end of the bellows 36 is fixed and which closes the end of the cylindrical body 35. (G) The guide member 37, in which the movable shaft 33b is inserted, the end portion thereof penetrates the bellows pressing plate 35b, and the tubular portion 37a extends inwardly of the tubular body 35. An outward flange portion 37b which is continuous with the end portion and spreads on the surface of the bellows pressing plate 35b on the side opposite to the cylindrical body 35.
A guide member 37 attached to the bellows pressing plate 35b, and (h) permanent magnet pieces 38a, 38b arranged in the thickness direction of both the fixed contact 26a and the movable contact 33a, and (i) further (J) An electrically insulating gas is enclosed in the sealing container 25 at a pressure higher than the atmospheric pressure, and the yoke member 39 is arranged so as to surround the permanent magnet pieces 38a, 38b. k) It is provided between the movable shaft 33b protruding to the outside of the cylindrical body 35 and the bellows pressing plate 35b, and spring-biases the movable electrode 33 in a direction away from the fixed electrode 26 so as to be adjacent in the axial direction. The coil portion 46 on the small diameter side has a shape to be housed in the radially inner region of the coil portion 47 on the large diameter side at the time of compression, and the maximum diameter end portion in the axial direction is a flange portion on the bellows pressing plate 35b. The sealed contact device is characterized by including a conical coil-shaped spring 40 surrounding 35b.

Action According to the present invention, the movable shaft projects to the outside of the cylindrical body fixed to the sealed container, and the conical coil spring is interposed between the movable shaft and the cylindrical body. Since the coil portion 46 on the small diameter side adjacent to the axial direction is housed in the radially inner area of the coil portion 47 on the large diameter side, the coil portion at the time of compression is compared with the cylindrical coil spring of the same natural length. The total length of the coil can be sufficiently shortened, and therefore, even if the conical coil spring of the present invention and the cylindrical coil spring have the same number of turns, the natural length in the axial direction is equal to that of the conical coil spring of the present invention. The spring of can be shortened. As a result, the movable shaft required for mounting can be shortened. Therefore, the entire structure of the sealed contact device can be downsized and the weight thereof can be reduced.

By shortening the movable shaft in this way, rattling of the movable shaft can be prevented, and accurate contact between the movable contact and the fixed contact can be ensured. In particular, in the present invention, the movable contact and the fixed contact are substantially disc-shaped, so that when the movable shaft tilts, for example, in a plane parallel to the paper surface of FIG. 2, the lower peripheral edge of the movable contact. Although there is a possibility that the edge, which is the portion, comes into contact with or in the vicinity of the movable contact to easily generate an arc, the present invention uses a conical coil spring to prevent such rattling of the movable shaft. The generation of arcs can be controlled. In particular, when one of the movable contact and the fixed contact has a substantially disk shape, and the contact surface is a flat surface that does not impair the disk shape, that is, as shown in FIG. In the present invention, it is possible to suppress the arc generation as described above when the upper end surface is a flat surface.

Further, in the present invention, since the maximum shear stress applied to the bellows can be reduced by eliminating the runout of the movable shaft in this way, the mechanical life of the bellows can be extended.

Further, according to the present invention, the contact shape is formed into a substantially disc shape, so that abrasion at the time of contact separation can be prevented. That is, according to the present invention, the arc generated when the fixed contact and the movable contact are separated from each other is the permanent magnet piece arranged in the thickness direction of both the fixed contact and the movable contact (left and right direction in FIG. 2). In the magnetic field generated by the Fleming's left-hand rule, the arc causes the arcs of the fixed contact and the movable contact to have flat end faces (end faces parallel to the paper surface of FIG. 1; The arc is generated between the fixed contact and the movable contact between the left and right circular arc surfaces in FIG. 1, and the arc thus generated is generated by the magnetic force in the thickness direction. In the vertical direction (left-right direction in FIG. 1), the arc length becomes longer and the arc is quickly extinguished.

Particularly according to the present invention, the tubular portion 37a of the guide member 37 is
Since it extends inward (downward in FIG. 1), that is, since the tubular portion 37a does not project upward in the tubular body 35 in FIG. The size of the movable shaft 33b can be reduced, the swing of the movable shaft 33b can be shortened to reduce the deflection, and the size of the movable shaft 33b can improve the opening speed.

Further, according to the present invention, the guide member 37 includes the outward flange portion 37.
b, the bellows pressing plate 35b is spread on the surface of the bellows pressing plate 35b on the opposite side, and the end of the guide member 37 is attached to the bellows pressing plate 35b. It becomes easy to securely fix 37 to the bellows pressing plate 35b, and the fixing strength can be increased.

Further in accordance with the present invention, the maximum diameter end portion of the spring 40 in the axial direction (the lower end portion in FIG. 1) surrounds the flange portion 35b on the bellows pressing plate 35b, in other words, the maximum diameter end portion thereof. There is no inconvenience of riding on the flange portion 35b, so that the spring force can be stably applied in the axial direction of the movable shaft 33b.

Embodiment FIG. 1 is a sectional view showing the structure of a sealed contact device 21 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along section line II-II in FIG. The structure and operation of the sealed contact device (hereinafter referred to as the contact device) 21 will be described with reference to FIGS. 1 and 2. The contact device 21 is formed of, for example, a body 22 made of an electrically insulating material such as ceramics and a metal material such as a copper-iron alloy or 42 alloy.
A sealed container 25 is formed by including end plates 23, 24 that are fixed by covering both ends in the axial direction of the body, and that includes the body portion 22 and the end plates 23, 24.

A fixed shaft 26b made of a metal material and having a fixed contact 26a fixed thereto is fitted into a fitting hole 24a provided in one end plate 24, and fixed by caulking or the like to form a fixed electrode 26. A trachea 27 is further connected to the end plate 24, and electrical insulation such as hydrogen gas having a high thermal conductivity or a mixed gas of hydrogen gas and nitrogen gas is provided from the trachea 27 through a vent hole 24b provided in the end plate 24. Gas is sealed in the airtight space 28 in the sealed container 25 at a pressure higher than atmospheric pressure (for example, 2 to 3 atm), the trachea 27 is pressure-bonded to hermetically seal the airtight space 28,
A connection terminal 30 to which the conducting wire 29 is connected is formed. The end plate 24 is made of an insulating material such as ceramics,
An insulating member 31 having an insertion hole 31a for the fixed shaft 26b is provided so as to be inscribed in the body portion 22 and the end plate 24.

On the surface of the other end plate 23 on the airtight space 28 side, the insulating member
An insulating member 32 made of the same material as that of 31 is fixed, and insertion holes 23a and 32 are provided in the end plate 23 and the insulating member 32, respectively.
A movable shaft 33b, which is formed by forming a metal material such as a copper-iron alloy into a rod shape, is inserted through a. A movable contact 33a is fixed to one end of the movable shaft 33b, a flange-shaped connection terminal 33c and a cap 33d made of a synthetic resin material are fixed to the other end, and a conductor 34 is connected to the connection terminal 33c. There is.

The movable contact 33c and the movable shaft 33b integrally form a movable electrode 33, and a cylinder having an insertion hole 35a for the movable shaft 33b on the outer surface of the end plate 23 at the peripheral edge of the insertion hole 23a. Cylindrical body
35 are placed. A bellows formed in a bellows shape by surrounding a movable shaft 33b inside a cylindrical body 35 and forming a corrugated fold on a three-layer thin metal cylinder of nickel-copper-nickel (Ni-Cu-Ni) with corrugated folds. 36 are arranged.

One end of the bellows 36 is attached to the movable shaft 33b by the mounting member 36a near the peripheral edge of the insertion hole 23a, and the other end is attached to the bellows pressing plate 35b provided at the end of the tubular body 35 by laser beam welding or the like. Are integrally and airtightly joined together. A guide member 37 through which the movable shaft 33b is inserted is attached to the bellows pressing plate 35b, and the movable shaft 33b penetrates the inside of the cylindrical body 35 via the guide member 37. By this bellows 36, a sealed container 25
The inner airtight space 8 is shut off from the outside and hermetically sealed.

The fixed contact 26a and the movable contact 33a are substantially disk-shaped symmetrical with each other, and the body portion 22 in the thickness direction (the left-right direction in FIG. 2) of both is fixed.
Permanent magnet pieces 38a and 38b are arranged outside of, and a yoke member 39 surrounds them.

A non-cylindrical coil spring having an elastic force that acts on the movable electrode 33 in a direction away from the fixed electrode 36 is formed between the bellows pressing plate 35b and the connection terminal 33c, for example, phosphor bronze or the like. A separation spring 40 having a conical coil shape is arranged. Due to the spring force of the opening / closing spring 40, the movable shaft 33b always receives a force directed in the direction indicated by the arrow B (upward in FIG. 1).

In the contact device 21 having such a structure, the movable shaft 33
b is pressed by a pressing means (not shown) against the spring force of the opening spring 40 and the opening force of the bellows 36 due to the pressure difference between the inside and outside of the sealing container 25, in the direction indicated by the arrow C (downward in FIG. 1). When pressed, the fixed contact 26a and the movable contact 33a come into contact and conduct. When the pressing force is removed, the movable shaft 33b causes the force in the arrow B direction (upward in FIG. 3) generated on the bellows 36 by the pressure difference between the inside and outside of the sealing container 25 and the spring force of the opening spring 40 in the same direction. The movable contact 33a receives the added force of
And the contacts are cut off.

At the time of this interruption, an arc that causes damage to the contacts 26a, 33a is generated, but in the contact device 21 according to the present embodiment, the generated arc is a mixture of hydrogen gas and nitrogen gas sealed in a sealed container 25 at high pressure. It rapidly cools by the gas cooling capacity, and further extinguishes in a short time by magnetic blowout based on the Lorentz force against the arc generated by the permanent magnets 37a, 37b arranged outside the sealed container 25, and the long life of the contacts 26a, 33a. It has been designed to improve reliability and reliability.

The first feature of this embodiment is that the separation spring 40 is provided as described above, and the separation force acting on the movable shaft 33 at the time of contact breaking is generated by the addition of the gas pressure acting on the bellows 36 and the spring force. That's what I did. The second feature of this embodiment is that
A conical coil spring is used as the opening spring 40. FIG. 3 is a sectional view showing a state in which the separation spring 40, which is such a conical coil spring, is expanded and contracted. With reference also to FIG. 3, the natural state of the opening spring 40 is shown in FIG. 3 (1). A cylindrical coil spring 45 having the same natural length as its natural length L1 is shown by a chain double-dashed line in FIG. The diameters of the wires forming the separation spring 40 and the cylindrical coil spring 45 are both D1, and it is assumed that the coil has n turns.

The total length L2 when the cylindrical coil spring 45 is sufficiently compressed is L2 = n · D1 (1). On the other hand, in the separation spring 40, if the difference Δ between the diameters D2 and D3 of the adjacent coil portions 46 and 47 having different diameters in the sectional view as shown in FIG. 3 is Δ / 2 ≧ D1 (2), The small diameter coil portion 46 is the large diameter coil portion 47.
Will be housed in the radially inner area of the. Therefore, in the case of the opening spring 40 that satisfies the condition of the second equation, the total length L2 at the time of compression becomes equal to the coil diameter D1.

At this point, the length of the movable shaft 33b protruding outward of the bellows pressing plate 35b is not required to be longer than the length of the cylindrical coil spring 45 when compressed, as described in the section of the prior art. Its length can be significantly reduced.

If the opening spring 40 satisfies the condition of the above-mentioned second equation,
With respect to the natural length L1, it can be formed as L1 <nD1 ... (3).
It is possible to reduce the length of the outward protruding portion of the bellows pressing plate 35 of b.

As apparent from FIGS. 1 and 2, the movable contact 33a
And the fixed contact 26a have a substantially disc shape. Therefore, wear of these contacts 33a, 26a at the time of separation is prevented. That is, the arc generated when the fixed contact 26a and the movable contact 33a are separated from each other, in the magnetic field generated by the permanent magnet pieces 38a, 38b arranged in the thickness direction of both of these contacts 26a, 33a. , Fleming's left-handed electromagnetic force acts to prevent the arc from wrapping around both end faces of contact points 26a, 33a (end faces parallel to the paper surface of FIG. 1, left and right end faces of FIG. 2), The arc will be generated between the arc surfaces of both contacts 26a, 33a. The arc thus generated is extended by the magnetic force between the directions (horizontal direction in FIG. 1) perpendicular to the thickness direction (direction perpendicular to the paper surface of FIG. 1),
The arc discharged between the arc-shaped outer peripheral surfaces of the contacts 26a, 33a is extinguished quickly by the arc length rapidly increasing when moving in the left-right direction in FIG. To be done.

The aforementioned spring 40 is composed of the tubular body 35, and hence the bellows pressing plate.
It is interposed between the movable shaft 33b and the connection terminal 33c fixed to the movable shaft 33b.

As is clear from FIG. 1 and FIG. 2, the movable shaft 33 is inserted into the bellows pressing plate 35b, and the end of the bellows 36 is fixed to the upper end of the cylindrical body 35. Block the upper end of the.

The guide member 37 has a tubular portion 37a and an outward flange portion 37b. The movable shaft 33b is inserted into the tubular portion 37a, and the end portion of the tubular portion 37a penetrates the bellows pressing plate 35b and projects and extends inward of the tubular body 35 (downward in FIGS. 1 and 2). . The outward flange portion 37b is continuous with the end portion of the tubular portion 37a and extends onto the surface of the bellows pressing plate 35b on the opposite side (upper side in FIGS. 1 and 2) of the tubular body 35. The thickness direction of both the fixed contact 26a and the movable contact 33a (direction perpendicular to the paper surface of FIG. 1,
The left and right directions in FIG. 2 are arranged so as to coincide with each other.

The maximum diameter end portion of the spring 40 in the axial direction (the lower end portion in FIGS. 1 and 2) is provided on the bellows pressing plate 35b with the flange portion 3
Surrounding 5b, ie the largest diameter end of this spring 40, has a larger diameter than the flange portion 35b.

As described above, according to the present invention, the conical coil spring 40 is provided.
Has a shape in which the coil portion 46a on the small diameter side that is adjacent in the axial direction is housed in the radially inner region of the coil portion 47 on the large diameter side when compressed, so compared with a cylindrical coil spring of the same natural length. Thus, the total length during compression can be shortened. Even if the cylindrical coil spring and the conical coil spring of the present invention have the same number of turns, their natural length in the axial direction is
The conical coil spring of the present invention can be shorter. Therefore, the movable shaft required for mounting can be shortened, and accordingly, the weight of the movable electrode as a whole can be reduced, and the overall structure of the sealed contact device can be made compact and lightweight. Furthermore, since the weight of the movable electrode as a whole can be reduced as described above, the opening speed can be increased and the existence time of the generated arc can be shortened. As a result, it is possible to prolong the service life of the contact, and thus to prolong the service life of the sealed contact device.

Further, according to the present invention, by using the conical coil spring, it is possible to reduce the deflection of the axis of the movable shaft. As a result, the bending of the bellows can be reduced, and the value of the maximum shear stress acting on the bellows can be reduced. Generally, the mechanical life of a bellows is determined by the maximum shear stress applied to the bellows. Therefore, according to the present invention, the conical coil spring is used to prevent the axial line of the movable shaft from fluctuating, so that the mechanical life of the bellows can be extended.

Further, according to the present invention, as described above, the conical coil spring is used to prevent the axial line of the movable shaft from fluctuating, whereby the edge of the movable contact comes into contact with the fixed contact to generate an arc. It is possible to prevent the occurrence of arcing, and it is possible to suppress the occurrence of arc.

Further, according to the present invention, since the fixed contact and the movable contact are substantially disc-shaped, it is possible to quickly extinguish the arc in the magnetic field of the permanent magnet piece. Also, the life can be extended.

Further, according to the present invention, the tubular portion 37a of the guide member 37 extends so as to project inwardly of the tubular body 35, so that the present sealed contact device can be downsized and the deflection of the movable shaft 33b can be reduced. In addition, the excellent effect that the contact opening speed can be improved by being downsized can also be achieved.

Further, according to the present invention, the guide member 37 includes the outward flange portion 37.
The guide member 37 has a bellows pressing plate 35b.
The guide member 37 can be firmly fixed to the bellows pressing plate 35b, and its fixing strength can be increased.

Further, according to the present invention, the maximum diameter end portion of the spring 40 in the axial direction surrounds the flange portion 35b on the bellows pressing plate 35b, that is, the maximum diameter end portion of the spring 40 is the flange portion 35b.
It is not configured to ride on b, so its maximum diameter end is stably positioned on the bellows pressing plate 35b,
Further, the effect that the spring force can be surely applied to the movable shaft 33b without hitting on the flange portion 35b or hitting the flange portion 35b and thus achieving a deliberate operation is also achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a sealed contact device 21 according to an embodiment of the present invention, FIG. 2 is a sectional view taken along section line II-II of FIG. 1, and FIG. A cross-sectional view showing the state when the
FIG. 4 is a sectional view of the sealed contact device 1 of the first conventional example, and FIG.
4 is a sectional view taken along the section line V-V in FIG. 4, FIG. 6 is a sectional view of the sealed contact device 1a having the basic structure of the present invention, and FIG. 7 is a sectional view line in FIG. FIG. 7 is a cross-sectional view seen from VII-VII. 21 …… Sealed contact device, 22 …… Body, 25 …… Sealed container, 26
...... Fixed electrode, 26a ...... Fixed contact, 28 ...... Airtight space, 33
…… Movable electrode, 33a …… Movable contact, 33b …… Movable shaft, 35…
… Cylinder, 36 …… Bellows, 38a, 38b …… Permanent magnets, 40…
… Separation spring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehiko Toguchi 1048, Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor, Shibata, 1048, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Works, Ltd. (56) References Japanese Unexamined Patent Publication No. 62-241212 (JP, A) Actually opened 50-27357 (JP, U) Actually opened 62-43428 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A sealed container 25 in which (a) an airtight space is formed.
(B) a fixed electrode 26 having a substantially disk-shaped fixed contact 26a at the tip of a fixed shaft 26b fixed in the sealed container 25, and (c) a fixed electrode 26a at the end of the movable shaft 33b. A movable contact 33a having a substantially disk shape that can be freely contacted and separated from the peripheral surface of the movable contact 33a is provided, and the fixed contact 26a and the movable contact 33a are arranged so that the thickness directions of both are the same, and (d) the sealing container 25, protruding outward and fixed, movable shaft
(B) A cylindrical body 35 into which 33b is inserted, and (e) a movable shaft 33b which is provided in the cylindrical body 35 and which surrounds the movable shaft 33b and has one end fixed to the movable shaft 33b and the other end fixed to the cylindrical body 35. And the movable shaft 33b is inserted into the bellows 36, and the bellows pressing plate 35b is provided at the end of the cylindrical body 35 to which the other end of the bellows 36 is fixed and which closes the end of the cylindrical body 35. (G) The guide member 37, in which the movable shaft 33b is inserted, the end portion thereof penetrates the bellows pressing plate 35b, and the tubular portion 37a extends inwardly of the tubular body 35. An outward flange portion 37b which is continuous with the end portion and spreads on the surface of the bellows pressing plate 35b on the side opposite to the cylindrical body 35.
A guide member 37 attached to the bellows pressing plate 35b, and (h) permanent magnet pieces 38a, 38b arranged in the thickness direction of both the fixed contact 26a and the movable contact 33a, and (i) further (J) An electrically insulating gas is enclosed in the sealing container 25 at a pressure higher than the atmospheric pressure, and the yoke member 39 is arranged so as to surround the permanent magnet pieces 38a, 38b. k) It is provided between the movable shaft 33b protruding to the outside of the cylindrical body 35 and the bellows pressing plate 35b, and spring-biases the movable electrode 33 in a direction away from the fixed electrode 26 so as to be adjacent in the axial direction. The coil portion 46 on the small diameter side has a shape to be housed in the radially inner region of the coil portion 47 on the large diameter side at the time of compression, and the maximum diameter end portion in the axial direction is a flange portion on the bellows pressing plate 35b. A sealed contact device including a conical coil-shaped spring (40) surrounding 35b.