JPH0615381Y2 - Sealed contact device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealed contact device suitably used, for example, in a switch of an electric circuit.

BACKGROUND ART Conventionally, the basic configuration of a contact device used in a circuit switch is that a fixed electrode provided with a fixed contact and a movable contact that comes in contact with / separates from the fixed contact are hermetically sealed in an electrically insulating housing. Was configured. In order to break the circuit in this contact device, the movable contact is separated from the fixed contact. In this separating operation, if the movable contact sways in a manner different from the predetermined displacement manner, it takes a lot of time and time to erase the arc generated between the fixed contact and the movable contact. However, there is a problem in that the realization of a quick circuit opening / closing operation is hindered and the movable contact and the fixed contact are worn by such an arc.

FIG. 5 shows a configuration devised to solve such a problem. The configuration shown in FIG. 5 is the basis of the present invention, and the configuration will be described with reference to FIG. The contact device 1 shown in FIG. 5 includes a body portion 2, a ceiling plate 3 that is fixed by covering both axial end portions of the body portion 2, and a bottom plate 4. The body 2, the ceiling plate 3, and the bottom plate 4 form a housing 5.

The bottom plate 4 is formed with an insertion hole 4a through which a holding member 6 formed of a conductive material in a rod shape is inserted, and a cap 7 for covering the outer side portion of the holding member 6 is arranged. Further, an exhaust hole 8 is formed in the bottom plate 4, and an exhaust pipe 9 is connected thereto. The exhaust pipe 9 supplies and exhausts hydrogen gas and the like into the housing 5. An insulating plate 10 made of, for example, a ceramic material and having an insertion hole 10a through which the holding member 6 is inserted and an exhaust hole 10b communicating with the exhaust hole 8 is arranged on the inner surface of the bottom plate 4.

Further, the ceiling plate 3 is formed with an insertion hole 3a through which the holding member 11 is inserted, and the inner surface of the ceiling plate 3 is
The insulating plate 12, which is also made of a ceramic material and has the insertion hole 12a through which the holding member 11 is inserted, is fixed.

On the outer surface of the ceiling plate 3, one end is fixed to the ceiling plate 3, and the other end is provided with, for example, a tubular guide member 15 having an insertion hole 14 through which the holding member 11 is inserted. Further, the holding member 11 is inserted inside the guide member 15, one end of which is airtightly coupled to the guide member 15, and the other end of which is hermetically joined as shown in FIG. Bellows member 1 made of metal thin film
6 is arranged. In this way, the space 17 in the housing 5 is hermetically sealed from the outside after the exhaust pipe 9 is hermetically shut off.

Here, the bellows member 16 is configured to urge the holding member 11 toward the inside of the housing 5. Therefore, when attempting to separate the movable contact 19 from the fixed contact 18, the holding member 11 is displaced to the outer side of the housing 5 by a configuration not shown. The movable contact 19 is replaced with the fixed contact 18
In order to bring the holding member 11 into contact with the housing 5, the force driving the holding member 11 to the outside of the housing 5 may be removed.

A fixed portion 23 for sandwiching and fixing the movable contact 19 is formed at an end portion of the holding member 11 on the inner side of the housing 5. On the other hand, a fixing portion 20 having a shape symmetrical to the fixing portion 23 is also formed at the inner end of the housing 5 of the holding member 6,
The fixed contact 18 having the same material as the movable contact 19 and the symmetrical shape is fixed. The movable contact 19 and the fixed contact 18 are configured to be in line contact with each other at the central portions in the left-right direction shown in FIG.

A guide portion 3 including a flange portion 29 and a guide tube portion 30 is provided at an end portion of the guide member 15 opposite to the housing 5.
1 is formed. An inner diameter R2 of the insertion hole 14 of the guide tube portion 30 is formed to be substantially equal to or slightly larger than an outer diameter R1 of the shaft portion 11a of the holding member 11, and the shaft portion 11a swings in a direction intersecting the axial direction. Guides so as to be able to reciprocate in parallel along the axial direction without performing. Therefore, the axial length of the guide tube portion 30 of the contact device 1 of this configuration example is formed to be a relatively long dimension. Further, the swinging of the shaft portion 11a as described above is performed by the bellows member 16 described above.
It is also suppressed by the spring force of.

FIG. 6 is a diagram for explaining the swing of the holding member 11 of the contact device 1 shown in FIG. The maximum displacement state of the holding member 11 in the swing is shown by the solid line in FIG. That is, the shaft portion 11a of the holding member 11 abuts on the outer end (upper end in FIG. 6) of the guide tubular portion 30, and the axially different positions of the shaft portion 11a are different with respect to the abutting position and the axis line of the guide member 15. It is realized by being in contact with the guide cylinder portion 30 at the opposite side position. At this time, the outer diameter R of the shaft portion 11a of the holding member 11
1, inner diameter R2 of the guide cylinder portion 30, inner diameter R of the guide member 15
3, the axial length L1 of the guide cylinder portion 30 and the guide cylinder portion 3
0 of the lower end and the distance L2 between the centroid of the movable contact 18 Niyotsute, displacement weight △ _x of the centroid of the movable contact 18 by the swinging of the holding member 11 is expressed by the following equation.

Here, the calculation of the displacement amount Δ _{x in} the first expression is performed based on the principle that the ratio of the corresponding sides of the similar triangle is constant. Further, the intersection of the axis l1 of the holding member 11 (indicated by a chain double-dashed line in FIG. 6) in the normal state and the axis l2 of the holding member 11 at the time of maximum displacement is the intermediate position in the axial direction of the guide cylinder portion 30. Here, for example, R1 = 1.9, R2 = 2.0, R
Assuming 3 = 6.0, L1 = 3.0, L2 = 17,
The △ _x = 0.62 in the first equation.

The contact device 1 shown in FIG.
Although the swinging of the holding member 11 is relatively reduced by providing the above, the swinging is further suppressed in order to improve the performance and prolong the life of the contact device 1 as described above. A configuration is desired.

To solve this problem, for example, JP-A-56-42
Based on the configuration disclosed in 923, it is conceivable to arrange the guide cylinder portion 30 coaxially with the guide member 15 so as to extend toward the ceiling plate 3 in the configuration of FIG.
With this configuration, it is possible to reduce undesired swinging of the holding member to which the movable contact is fixed as much as possible.

However, the configuration proposed in FIG. 5 has another problem. In the configuration of FIG. 5, the fixed contact 1
Metal particles generated when an arc is generated between the movable contact 19 and the movable contact 19 and the inner peripheral surface of the body 2 and the insulating plates 10 and 12.
And the inner peripheral surface of the insertion hole 12a,
Therefore, there is a possibility that the ceiling plate 3 and the outer portion of the holding member 6 or the fixed portion 20 are electrically short-circuited via such adhered metal fine particles, and the insulation performance is deteriorated.

OBJECT The object of the present invention is to provide a sealed contact device which solves the above-mentioned problems and is capable of improving the insulation performance.

According to the present invention, (a) the fixed contact 58, (b) the fixed contact 58 is fixed to the upper end portion, and the rod-shaped first holding member 46 extends downward, and (c) the fixed contact 58 above the fixed contact 58. A movable contact 59 that contacts / separates, (d) a rod-shaped second holding member 51 having the movable contact 59 fixed to its lower end and extending upward, (e) a housing 45, and (e1) a fixed contact 58. An electrically insulating body 42 surrounding the movable contact 59, (e2) a conductive ceiling plate 43 closing the end of the body 42 on the side of the movable contact 59, and (e3) a fixed contact 58 of the body 42. A housing 45 having a conductive bottom plate 44 that closes the end on the side, (f) a first electrical insulating plate 52 fixed to the inner surface of the ceiling plate 43, and (g) an inner surface of the bottom plate 44. And a second electric insulating plate 50 fixed, (h) the second holding member 51, The through holes 43a and 52a formed in the ceiling plate 43 and the first electrical insulating plate 52 are inserted, and (i) the through holes 43a and 52a are surrounded and fixed so as to project outward from the ceiling plate 43. A storage member 55, and (j) a guide member 71 provided at an end of the storage member 55 opposite to the housing 45, including (j1) a flange portion 69 fixed to the storage member 55, and (j2) a flange. And a guide member 71 that is formed integrally with the portion 69, has the second holding member 51 inserted therein so as to be able to move up and down, and has a guide cylinder portion 70 that extends toward the ceiling plate 43. (k) Second electrical insulating plate Reference numeral 50 denotes a small-diameter insertion hole 50a through which the first holding member 46 is inserted outward in the radial direction, and a small-diameter insertion hole 50a that is continuous with the small-diameter insertion hole 50a on the bottom plate 44 side and has a large-diameter insertion hole having a larger diameter than the small-diameter insertion hole 50a. With a hole 50c, (l) on the bottom plate 44 A sealed contact device, characterized in that the exhaust pipe 49 communicating with the large 径挿 hole 50c is connected.

Embodiment FIG. 1 is a sectional view of a sealed contact device 41 according to an embodiment of the present invention. The configuration of the sealed contact device (hereinafter, abbreviated as contact device) 41 will be described with reference to FIG. The contact device 41 is fixed by covering a body portion 42 formed of an electrically insulating material such as a ceramics material or alumina and both axial end portions of the body portion 42, for example, acid-free copper or 4
A ceiling plate 43 formed of a material such as -2 alloy and a bottom plate 44 are included. The body portion 42, the ceiling plate 43, and the bottom plate 44 form a housing 45.

The bottom plate 44 is formed with an insertion hole 47 into which a holding member 46 made of, for example, acid-free copper and having a rod shape is inserted. The outer portion of the housing 45 of the holding member 46 is covered with a cap 73 made of a conductive material. Also the bottom plate 4
4, an exhaust hole 48 is formed, and an exhaust pipe 49 for supplying and exhausting hydrogen gas through the exhaust hole 48 is connected thereto. The exhaust pipe 49 is sealed after exhausting the hydrogen gas and the like enclosed in the housing 45. On the inner surface of the bottom plate 44, an electrical insulating plate 50 made of, for example, a ceramic material and having an insertion hole 50a50c through which the holding member 46 is inserted and an exhaust hole 50b communicating with the exhaust hole 48 is fixed.

Further, the ceiling plate 43 is formed with an insertion hole 43a through which the holding member 51 made of acid-free copper is inserted.
An electrical insulating plate 52, which is also made of a ceramic material and has an insertion hole 52a through which the holding member 51 is inserted, is fixed to the inner surface of the. A storage cylinder 55, in which the holding member 51 is stored, is arranged on the outer surface of the ceiling plate 43 and at the peripheral edge of the insertion hole 43a.

Further, the holding member 51 is inserted inside the storage cylinder 55, one end of which is airtightly coupled to the storage cylinder 55, and the other end of which is airtightly coupled to the holding member 51 as shown in FIG. For example, a bellows member (bellow flam) 56 formed of a metal thin film having a thickness of 20 μm is arranged. In this way, the space 57 in the housing 45 is hermetically sealed from the outside after the exhaust pipe 49 is hermetically shut off.

Here, the bellows member 56 is configured to bias the holding member 51 toward the inside of the housing 45. Therefore, when attempting to separate the movable contact 59 from the fixed contact 58, the holding member 51 is displaced to the outer side of the housing 45 by a configuration not shown. When trying to bring the movable contact 59 into contact with the fixed contact 58, the holding member 51 is used.
It suffices to remove the force that has driven the outer side of the housing 45.

Further, the ceiling plate 4 of the guide cylinder 55 of the shaft portion 51a of the holding member 51
A guide member 71 is provided at an end portion on the side opposite to 3. The guide member 71 is integrally formed with the flange portion 69 fixed to the end portion of the storage cylinder 55 on the side opposite to the ceiling plate 43, and inside the bellows member 56, the shaft portion 51 of the holding member 51.
The guide tube portion 7 that is inserted into the a and extends toward the ceiling plate 43 side.
Including 0 and.

A fixed portion 60 for sandwiching the movable contact 59 is formed at an end portion of the holding member 51 on the inner side of the housing 45. The fixed contact 60 has a substantially disk shape and is made of a material such as tungsten W. 59 is fixed. On the other hand, at the inner end of the housing 45 of the holding member 46, the fixing portion 6 is also provided.
The fixed portion 63 having a shape symmetrical to that of the movable contact 59 is formed.
A fixed contact 58 having a similar material and symmetrical shape is fixed. These movable contact 59 and fixed contact 58
Are configured to be in line contact with each other at the central portions in the left-right direction shown in FIG.

2 is a view showing a normal arrangement state of the holding member 51 of the contact device 41 shown in FIG. 1, FIG. 3 is a view showing an arrangement state of the holding member 51 at the time of swinging, and FIG. It is a figure which shows the basis which calculates the maximum displacement amount of the movable contact 59 of the state of FIG. The swing of the holding member 51 will be described with reference to FIGS. 1 to 4. The maximum displacement state of the holding member 51 during the swing is shown by the solid line in FIG. That is, the holding member 51 is provided at the outer end (upper end in FIG. 1) of the guide tubular portion 70.
Shaft portion 51 a of the guide cylinder portion 70 abuts, and the lower end portion of the guide cylinder portion 70 at the position opposite to the contact position with respect to the axis of the storage cylinder 55 (first
It is realized by being in contact with the lower end of the figure).

At this time, the outer diameter R11 of the shaft portion 51a of the holding member 51, the inner diameter R12 of the guide cylinder portion 70, and the axial length L of the guide cylinder portion 70.
11 and the distance L12 between the upper end of the guide cylinder 70 and the centroid of the movable contact 59, the displacement _{Δx1 of the} centroid of the movable contact 59 due to the swing of the holding member 51 is as follows. Represented. Also, the axis L of the holding member 51 in the normal state
The intersection P1 between 11 and the axis L12 of the holding member 51 at the time of maximum displacement is the axial intermediate position of the guide cylinder portion 70.

That is, here, R11 = 1.9, R12 = 2.0, L1
Assuming that 1 = 6.0 and L12 = 17, the holding member 51
The displacement amount Δ _{x1 of the} centroid of the movable contact 59 when the movable contact 59 is in the maximum displacement state by swinging from the normal position where is not swinging is calculated by the following second equation.

Substituting the above-mentioned numerical values into the second equation, Δ _x1 =
0.23 is obtained. Here, the displacement amount of the second equation Δ _x1
Is calculated based on the principle that the ratio of corresponding sides of the similar triangle is constant. In other words, comparing with the displacement amount Δ _{x in} the case of the configuration example which is the basis of the present invention described with reference to FIG. 5 and Δ _x = 0.62,
With the above-mentioned configuration, in this embodiment, the displacement amount could be suppressed to about 1/3. Therefore, the swinging of the holding member 51 as described above can be suppressed as much as possible, and the arc extinguishing in the contact device 41 can be quickly realized, and in comparison with the basic configuration example shown in FIG. It is possible to prevent the structure from becoming large.

To further describe the above-mentioned configuration, a fixed contact 58 is fixed to the upper end of the holding member 46, and the holding member 46 extends downward. The movable contact 59 is above the fixed contact 58. A movable contact 59 is fixed to the lower end of the holding member 51. The holding member 51 extends upward. The body 42 of the housing 45 surrounds the contacts 58 and 59 and is electrically insulating.
The conductive ceiling plate 43 closes the end of the body 42 on the side of the movable contact 59. The conductive bottom plate 44 is used for the fixed contacts 5 of the body 42.
The end on the 8 side is closed. The holding member 51 has insertion holes 43a formed in the ceiling plate 43 and the first electric insulating plate 52,
52a is inserted. The storage cylinder 55 has the insertion holes 43a, 52.
The ceiling board 43 is fixed so as to surround a and project outward (upward in FIG. 1). The guide member 71 is provided at the end of the housing cylinder 55 on the side opposite to the housing 45 (upper side in FIG. 1). The guide member 71 has a flange portion 69 fixed to the storage portion 55 and a guide cylinder portion 70 integrally formed with the flange portion 69. The guide tube portion 70 is inserted through the holding member 51 so that the holding member 51 can be moved up and down, and extends downward in FIG. 1 toward the ceiling plate 43.

The second electric insulating plate 50 has an insertion hole 50a and another insertion hole 50c. The insertion hole 50a is used as the holding member 46.
Has a small diameter and is inserted radially outward at intervals. The other insertion hole 50c is connected to the insertion hole 50a on the bottom plate 44 side (downward in FIG. 1). The insertion hole 50c has a larger diameter than the insertion hole 50a. The exhaust hole 50b is connected to the insertion hole 50c. The large diameter insertion hole 50 is formed in the bottom plate 44.
The exhaust hole 49 communicating with c is connected. Since the small-diameter insertion hole 50a and the larger-diameter insertion hole 50c are continuously formed in the electric insulating plate 50, the arc generated between the fixed contact 58 and the movable contact 59 is formed. As a result, the metal fine particles at the contacts 58, 59 are scattered and the body portion 42
Even when attached to the inner surfaces of the electric insulating plates 50 and 52, the inner peripheral surface of the large-diameter insertion hole 50c and the step surface 50d formed by these insertion holes 50a and 50c are It becomes difficult for fine metal particles to adhere. Therefore, it is possible to prevent the holding members 46 and 51 from being electrically connected to each other through the bottom plate 44 and the ceiling plate 43, the storage cylinder 55, and the guide member 71.

According to the above-described embodiment, since the guide cylinder portion 70 guides the second holding member 51 to which the movable contact 59 is fixed, swinging of the second holding member 51 is suppressed, It is possible to improve the performance of the present sealed contact device and to extend the life of the device.

Further, according to the present invention, the housing cylinder 55 and the guide member 71 are provided outside the housing 45, and the guide cylinder portion 70 of the guide member 71 allows the second holding member 5 for the movable contact 59.
Since the guide tube 1 is guided, it is possible to easily suppress the swing of the second holding member 51 by mounting the storage cylinder 55 and the guide member 71 in the housing 45. The excellent effect that the present invention can be easily realized in connection with the existing housing 45 is also achieved.

Effect As described above, according to the present invention, the second electric insulating plate 50 fixed to the inner surface of the bottom plate 44 has a small diameter insertion hole 50a.
And a large-diameter large-diameter through-hole 50c connected to the small-diameter through-hole 50a on the side of the bottom plate 44 is formed. Therefore, it is difficult for metal fine particles to adhere to the inner surface of the large-diameter through-hole 50c when an arc occurs. As a result, it is possible to reliably suppress the short circuit due to the metal fine particles between the bottom plate 44 and the ceiling plate 43, and to further improve the insulation performance.

[Brief description of drawings]

FIG. 1 is a sectional view of a contact device 41 according to an embodiment of the present invention, and FIG. 2 is a holding member 5 in a state in which it is not swung in a storage cylinder 55.
1 shows the state of FIG. 1, FIG. 3 shows the arrangement state of the holding member 51 which is in the maximum displacement state in the storage cylinder 55, and FIG. 4 shows the maximum displacement amount of the movable contact 59 in the state of FIG. FIG. 5 is a diagram showing the basis for calculation, FIG. 5 is a cross-sectional view of the contact device 1 having a basic structure of the present invention, and FIG.
It is a figure which shows the basis which calculates the maximum displacement amount of 9. 41 ... Contact device, 46, 51 ... Holding member, 51a ...
... Shaft, 58 ... Fixed contact, 59 ... Moving contact, 70 ...
... guide cylinder part, 70 ... guide cylinder part, 71 ... guide member

Claims (1)

[Scope of utility model registration request] Claims: (a) a fixed contact 58, (b) a fixed contact 58 fixed to the upper end, a rod-shaped first holding member 46 extending downward, and (c) a fixed contact 58 above the fixed contact 58. A movable contact 59 contacting / separating from, a (d) movable contact 59 is fixed to the lower end, and a rod-shaped second holding member 51 extending upward, (e) a housing 45, and (e1) a fixed contact 58. And the movable contact 59, the electrically insulating body 42 surrounding the movable contact 59, (e2) the conductive ceiling plate 43 closing the end of the body 42 on the side of the movable contact 59, and (e3) the fixed contact of the body 42. A housing 45 having a conductive bottom plate 44 that closes the end on the 58 side; (f) a first electrical insulating plate 52 fixed to the inner surface of the ceiling plate 43; and (g) an inner surface of the bottom plate 44. And (2) the second holding member 51 includes: , Through the insertion holes 43a, 52a formed in the ceiling plate 43 and the first electrical insulating plate 52, and (i) surrounding the insertion holes 43a, 52a, protruding outward from the ceiling plate 43 and fixed. And a guide member 71 provided at an end of the housing cylinder 55 opposite to the housing 45. (j1) a flange portion 69 fixed to the housing part 55, and (j2) A guide member 71 that is integrally formed with the flange portion 69, has the second holding member 51 vertically inserted therein, and has a guide cylinder portion 70 that extends toward the ceiling plate 43; and (k) second electrical insulation The plate 50 is connected to the small-diameter insertion hole 50a through which the first holding member 46 is inserted in the radially outward direction with a gap, and the small-diameter insertion hole 50a is continuous on the bottom plate 44 side, and has a larger diameter than the small-diameter insertion hole 50a. Has a through hole 50c, and (l) bottom plate 44 Is sealed contact device, characterized in that the exhaust pipe 49 communicating with the large 径挿 hole 50c is connected.