JP2004146284A - Sealed electric equipment case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed switch in which a structural member sealing an opening is of light weight and assembling work is made easier. <P>SOLUTION: The sealed switch comprises a case 11 in which an electric equipment body is housed and which has an opening 12 and a lid 15 which closes the opening 12 of the case 11, and a neck 13 and a flange 14 in which the outer circumference of the neck 13 extends outside in parallel with the side face of the case 11 are provided at the opening 12 of the case 11. Guides 16a, 16b on the inner circumference side and the outer circumference side are provided between the opposing faces of the flange 14 and the lid 15 opposed to the flange 14, and an O ring 17 is provided between the guides 16a, 16b on the inner circumference side and the outer circumference side, and a tightening means is provided which, by compressing the O ring 17, makes it adhere closely to the lid 15 and the flange 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
SUMMARY OF THE INVENTION The present invention relates to a sealed electric device that can reduce the weight of a structural material that constitutes a closing member that seals an opening for internal confirmation or an electric device such as a switch in a housing or that facilitates assembly work. It relates to a device housing.
[0002]
[Prior art]
Conventional sealed electric equipment of this type, for example, a switch, has an insulating gas pressurized and sealed in a housing to improve the insulation performance and environmental resistance of the switch, which is the main body of the electric equipment to be housed. . This makes it possible to provide a switch that is not affected by the atmosphere of the outside air and can be installed anywhere.
[0003]
As shown in FIG. 5, the casing 1 of the closed type switch is provided with rectangular openings 2a and 2b for incorporating a switch or the like on both sides of the casing 1, or for checking the inside, A rectangular lid 3 is fixed to the openings 2a and 2b with a plurality of bolts 4 and closed. A bushing hole 5 is provided on the other surface, for example, the upper part of the housing 1, and a bushing for connecting a power supply side and a load side (not shown) is air-tightly fixed therethrough.
[0004]
For example, three switches 6 connected to the bushing are accommodated in the housing 1 and an insulating gas such as dry air is sealed at a gauge pressure of 0.05 MPa or less.
[0005]
In order to seal the openings 2a and 2b, as shown in FIG. 6, a thick flange 7 is fixed around the opening 2a (2b) by welding. Generally, an O-ring groove 8 is provided around the outer periphery, and an O-ring 9 is mounted in the O-ring groove 8, covered with a detachable lid 3, and fixed with a plurality of bolts 4. .
[0006]
The O-ring 9 is known to have a configuration in which an elastic body made of, for example, chloroprene rubber is molded in an annular shape and the compression ratio is maintained at 25% (for example, see Non-Patent Document 1). .).
[0007]
The structural material constituting the closing member that seals the opening 2a (2b) configured as described above has a thicker flange 7 and a constant compression rate of the O-ring 9, so that the lid 3 has a certain size. It must be thick, and there is a problem that it becomes heavy.
[0008]
To solve this, the following technique is known (see Patent Document 1). In this method, an opening is formed with a neck portion and a flange portion integrally extending from the neck portion to the outer periphery, and the flange portion is covered with a thin lid via a gasket. Then, a clamp having a U-shaped cross section is sandwiched between the peripheral portion of the lid and the peripheral portion of the flange portion, and the lid sandwiched between the clamps is pressed with a bolt attached to the clamp, so that the gasket, the lid and the flange portion are brought into close contact with each other. The opening is sealed. However, this method requires accessory parts such as the clamp, and has a problem that the number of parts increases and the assembling work becomes complicated.
[0009]
[Non-patent document 1]
Konno Rubber Co., Ltd. Business Information Catalog, 2001, p. 6
[0010]
[Patent Document 1]
JP-A-2002-171624 (page 3, FIG. 3)
[0011]
[Problems to be solved by the invention]
In the above-described conventional sealed electric equipment housing, the structural material such as the flange 7 and the lid 3 for sealing the openings 2a and 2b becomes thick and heavy, and the number of parts is reduced due to the necessity of accessory parts. There has been a problem that much time is required for assembling work.
[0012]
Therefore, an object of the present invention is to provide a sealed electric device housing which can reduce the weight of a structural material constituting a closing member for sealing an opening and facilitate assembly work.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a sealed switch according to a first aspect of the present invention includes a housing having an electric device main body housed therein and having an opening, and a lid for closing the opening of the housing. The opening of the housing is provided with a neck portion and a flange portion whose outer periphery is parallel to the side surface of the housing and extends outward, and a predetermined portion is provided between a facing surface of the lid and the facing flange portion. A guide provided on the inner peripheral side and an outer peripheral side with an interval between them, an O-ring provided between the guides on the inner peripheral side and the outer peripheral side, and a tightening means for compressing the O-ring and bringing it into close contact with the lid and the flange portion It is characterized by having.
[0014]
According to such a configuration, a flange or a lid of a structural material for closing the opening can be reduced in weight because it is thin, and assembling work becomes easy because the number of parts is small.
[0015]
In addition, a sealed switch according to a second aspect of the present invention includes a housing having an electric device main body housed therein and having an opening, and a lid for closing the opening of the housing. The opening has a neck portion and a flange portion whose outer periphery is parallel to the side surface of the housing and extends outward. A convex portion having a semicircular cross section is provided between the flange portion and an opposing surface of the lid. The gasket is provided on both sides in the circumferential direction, and spacers for holding the gasket are provided on both surfaces of the outer periphery of the convex portion of the gasket, and the convex portions on both surfaces of the gasket are compressed to respectively cover the lid and the flange portion. And a tightening means for bringing the device into close contact.
[0016]
According to such a configuration, a flange or a lid of a structural material for closing the opening can be reduced in weight because it is thin, and assembling work becomes easy because the number of parts is small.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
First, a sealed electric device housing according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a main part showing an opening of a sealed electric device housing according to a first embodiment of the present invention. Note that the overall configuration of the sealed electric device housing having an opening is the same as that shown in FIG.
[0018]
As shown in FIG. 1, the housing 11 around the rectangular opening 12 provided on the side surface of the housing 11 has a neck portion 13 and folded back from the neck portion 13 in parallel to the side surface of the housing 11 to form an outer periphery. It has a rectangular flange 14 extending toward it. On the other hand, a rectangular and thin lid 15 whose peripheral portion is bent in the direction of the opening 12 so as to surround the flange portion 14 and has a U-shaped cross section is detachably attached so as to close the opening 12. Is provided. Ring-shaped guides 16a and 16b are attached to the surface of the lid 15 facing the flange portion 14 by spot welding, for example, on the lid 15 side so as to keep a constant interval between the outer peripheral side and the inner peripheral side. . The inner peripheral side guide 16 b has an outer peripheral surface having a size equal to or greater than the inner peripheral surface of the opening 12.
[0019]
An O-ring 17 having an elastic body made of, for example, chloroprene rubber is mounted between the guides 16a and 16b. The cover 15, the outer guide 16a, and the flange 14 are provided with a plurality of holes through which bolts 18 pass. The O-ring 17 is connected to the plurality of bolts 18 so that the compression ratio becomes 25%. It is fastened with a plurality of nuts 19 and is sandwiched between the flange portion 14 and the lid 15.
[0020]
This tightening is performed until the flange portion 14 and the lid 15 come into close contact with each other via the guides 16a and 16b. For this reason, since the compression ratio of the O-ring 17 is determined by using the guides 16a and 16b having a height lower than the diameter of the O-ring 17, the diameter of the O-ring 17 and the guide 16a are set in advance so that the compression ratio becomes 25%. , 16b may be selected.
[0021]
In addition, the nut 19 may be fixed to the flange 14 side of the surface facing the housing 11 by, for example, spot welding.
[0022]
As described above, the bolt 18 penetrating from the lid 15 to the flange portion 14 via the outer peripheral side guide 16a and the nut 19 constitute a fastening means between the lid 15 and the flange portion 14. Further, since the lid 15 is bent at the peripheral portion, the mechanical strength is improved despite its thinness, and the above-described compression ratio can be sufficiently maintained.
[0023]
Here, the compression ratio of the O-ring 17 may be reduced to 5% to less than 25%. This is because even if the surfaces of the thin lid 15 and the flange portion 14 are slightly distorted, the distortion is corrected by tightening with the bolts 18 so that the surfaces are in close contact with each other. Are in close contact over the entire periphery of each other. Since the compression ratio is determined by the height of the guides 16a and 16b and the diameter of the O-ring 17 as described above, it can be easily adjusted.
[0024]
If the compression ratio is less than 5%, the distortion between the lid 15 and the flange 14 is not sufficiently corrected, and the degree of adhesion of the O-ring 17 is undesirably reduced. On the other hand, when the compression ratio exceeds 25%, the repulsive force of the O-ring 17 over a long period of time is undesirably reduced.
[0025]
As described above, the structural material that seals the opening 12 includes the flange 14, the lid 15, the guides 16 a and 16 b, the O-ring 17, the bolt 18, and the nut 19. Thereby, the insulating gas such as dry air sealed in the box 11 can be sealed.
[0026]
According to the sealed electric device housing according to the first embodiment, the flange portion 14 and the lid 15 of the structural material for sealing the opening 12 for incorporating the electric device main body can be reduced in weight due to the thinness, Also, since the number of parts is small, the assembling work becomes easy. Furthermore, since the O-ring 17 can reduce the compression ratio, the repulsion can be maintained for a long period of time. This makes it possible to obtain a sealed electric device housing capable of stabilizing the degree of sealing in the housing for a long period of time.
[0027]
(Second embodiment)
Next, a closed switch according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view of a main part showing an opening of a sealed electric device housing according to a second embodiment of the present invention.
[0028]
As shown in FIG. 2, the housing 11 around the rectangular opening 12 provided on the side surface of the housing 11 has a neck portion 13 and folded back from the neck portion 13 in parallel to the side surface of the housing 11 to form an outer periphery. It has a rectangular flange 14 extending toward it. On the other hand, a rectangular and thin lid 15 whose peripheral portion is bent in the direction of the opening 12 so as to surround the flange portion 14 and has a U-shaped cross section is detachably attached so as to close the opening 12. Is provided.
[0029]
A gasket 20 formed in a rectangular ring shape having an elastic body made of, for example, chloroprene rubber is inserted between opposing surfaces of the lid 15 and the flange portion 14. The gasket 20 is provided with convex portions 20a and 20b each having a semicircular cross section on both surfaces over the entire circumference.
[0030]
In addition, rectangular spacers 21a and 21b are provided over the entire circumference at portions of the gasket 20 located on the outer peripheral side of the convex portions 20a and 20b. The spacers 21a and 21b are configured to have a height lower than the height up to the tops of the protrusions 20a and 20b. The spacers 21a and 21b may be attached to the lid 15 and the flange portion 14, for example, by spot welding.
[0031]
The cover 15, the flange portion 14, the gasket 20, and the spacers 21a and 21b are provided with holes through which the bolts 18 pass. The gasket 20 has a plurality of protrusions 20a and 20b having a compression ratio of 25%. Of the flange portion 14 and the lid 15.
[0032]
This tightening is performed until the gasket 20 and the spacers 21a and 21b between the flange portion 14 and the lid 15 come into close contact with each other. For this reason, the compression ratio of the projections 20a, 20b is determined by the difference between the deformation of the gasket 20 in close contact with the spacers 21a, 21b and the deformation of the projections 20a, 20b. That is, the amount of these deformations is larger in the convex portions 20a and 20b whose tops are in linear contact than in the gasket 20 having a large area in close contact with the spacers 21a and 21b. Therefore, the heights of the protrusions 20a and 20b and the heights of the spacers 21a and 21b may be selected in advance so that the compression ratio of the protrusions 20a and 20b is 25%.
[0033]
The nut 19 may be fixed to the surface of the flange portion 14 facing the housing 11 by, for example, spot welding.
[0034]
As described above, the bolt 18 penetrating from the lid 15 to the flange portion 14 through the gasket 20 and the spacers 21 a and 21 b provided on both surfaces of the gasket 20 and the nut 19 provide a fastening means between the lid 15 and the flange portion 14. Be composed. Further, since the lid 15 is bent at the peripheral portion, the mechanical strength is improved despite its thinness, and the above-described compression ratio can be sufficiently maintained.
[0035]
Note that the compression ratio may be reduced to 5% to less than 25%. This is because even if the surfaces of the thin lid 15 and the flange portion 14 are slightly distorted, the distortion is corrected by tightening with the bolts 18 so that the surfaces are in close contact with each other. This is because the surfaces 20a and 20b are in close contact with each other over the entire circumference of the opposing surfaces. This compression ratio can be easily adjusted because the amount of deformation is determined by the heights of the spacers 21a and 21b and the projections 20a and 20b as described above.
[0036]
If the compression ratio of the gasket 20 is less than 5%, the distortion of the lid 15 and the flange portion 14 is not sufficiently corrected, and the degree of adhesion between the convex portions 20a and 20b is not preferable. On the other hand, if the compression ratio exceeds 25%, the long-term repulsion of the gasket 20 including the projections 20a and 20b is undesirably reduced.
[0037]
The structural material that seals the opening 12 in this manner is constituted by the flange portion 14, the lid 15, the gasket 20, the spacers 21a and 21b, the bolts 18 and the nuts 19. An insulating gas such as air can be sealed.
[0038]
According to the hermetically sealed electric device housing according to the second embodiment, since the flange portion 14 and the lid 15 of the structural material for sealing the opening 12 for incorporating the electric device main body such as a switch are thin. Since the weight can be reduced and the number of parts is small, the assembling work becomes easy. Further, since the gasket 20 can reduce the compression ratio, the repulsion can be maintained for a long period of time. This makes it possible to obtain a sealed electric equipment housing in which the degree of sealing of the insulating gas is stabilized for a long period of time.
[0039]
In the above-described embodiment, the gasket 20 has the projections 20a and 20b on both sides provided on the inner peripheral side of the bolt 18. However, as shown in FIG. 3 showing the third embodiment, The protrusions of the gasket 22 may be provided on both sides in the circumferential direction with the bolt 18 interposed therebetween. That is, on both surfaces of the gasket 22, the convex portions 22a and 22b on the inner peripheral side and the convex portions 22c and 22d on the outer peripheral side having a semicircular cross section are provided. Here, the heights of the protrusions 22a, 22b and 22c, 22d up to the top are larger than the heights of the spacers 23a, 23b.
[0040]
The lid 15 and the flange 14 are connected to the gasket 22 and the spacer 14 by bolts 18 and nuts 19 via spacers 23a and 23b provided between the inner protrusions 22a and 22b and the outer protrusions 22c and 22d. It is tightened until each of 23a and 23b comes into close contact.
[0041]
As a result, the inner-side protrusions 22a, 22b and the outer-side protrusions 22c, 22d are located on both sides of the bolt 18, so that the inner-side protrusions 22a, 22b and the outer-side protrusions 22c, 22d are formed. Each compression ratio can be balanced, and the degree of sealing can be improved. The compression ratio can be easily adjusted because the height of the spacers 23a and 23b determines the amount of deformation of the projections 22a and 22b and 22c and 22d as described above.
[0042]
As shown in FIG. 4 showing the fourth embodiment, a cylindrical spacer 25 sandwiched between the lid 15 and the flange portion 14 is integrally molded with the gasket 24 at a portion where the bolt 18 of the gasket 24 penetrates. It may be provided. The convex portions 24a, 24b and 24c, 24d having a semicircular cross section are arranged on both sides in the circumferential direction of the gasket 24 with the spacer 25 interposed therebetween. Here, the linear distance between the tops of the protrusions 24a, 24b and the protrusions 24c, 24d is greater than the height of the spacer 25.
[0043]
The bolt 18 and the nut 19 are tightened until the spacer 25 provided between the inner peripheral side convex portions 24a and 24b and the outer peripheral side convex portions 24c and 24d comes into close contact between the flange portion 14 and the lid 15.
[0044]
As a result, the inner peripheral side convex portions 24a, 24b and the outer peripheral side convex portions 24c, 24d are located on both sides of the bolt 18, so that the inner peripheral side convex portions 24a, 24b and the outer peripheral side convex portions 24c, 24d are formed. The compression ratio can be balanced, and the degree of sealing can be further improved. This compression ratio can be easily adjusted because it is determined by the linear distance between the tops of the inner peripheral sides and the outer peripheral sides of the protrusions 24a and 24b and the protrusions 24c and 24d and the height of the spacer 25.
[0045]
It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications without departing from the spirit of the invention. In the first to fourth embodiments, dry air is sealed as an insulating gas in order to improve insulation performance and environmental resistance performance. However, in order to further improve insulation performance, SF6 gas whose dielectric strength is about three times higher than dry air is used. May be enclosed. Further, a mixed gas of SF6 gas / air may be used.
[0046]
Thus, the dielectric strength of, for example, a switch housed in the housing can be improved, so that the overall shape of the sealed electric device can be reduced in size.
[0047]
In the first to fourth embodiments, the opening, the flange extending from the opening to the outer periphery, the lid for closing the opening, and the like are rectangular. However, these may be circular.
[0048]
Thereby, the stress applied to the end surface of the lid and the flange can be made uniform, and the number and strength of bolts for fastening the lid and the flange can be reduced.
[0049]
【The invention's effect】
As described above, according to the present invention, in a sealed electric device housing having an opening for incorporating an electric device main body, the opening has a neck portion and the neck portion is folded back to the side of the housing and directed toward the outer periphery. Since a flange portion is provided, the elastic body is disposed between the facing surface of the lid and the flange portion provided to surround the flange portion, and the opening is closed as a configuration for tightening the gap between the flange portion and the lid. The structural material for closing the opening can be reduced in weight, and the number of parts is small, so that the assembling work can be facilitated. Furthermore, since the compression ratio of the elastic body can be reduced, a resilient force can be maintained for a long time, and a hermetic switch in which the sealing degree of the insulating gas is stabilized for a long time can be obtained. Can be.
[Brief description of the drawings]
FIG. 1 is an essential part cross-sectional view showing an opening of a sealed electric device housing according to a first embodiment of the present invention.
FIG. 2 is an essential part cross-sectional view showing an opening of a sealed electric device housing according to a second embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of a main part showing an opening of a sealed electric device housing according to a third embodiment of the present invention.
FIG. 4 is an essential part enlarged sectional view showing an opening of a sealed electric device housing according to a fourth embodiment of the present invention.
FIG. 5 is a schematic perspective view showing an outline of a sealed switch.
FIG. 6 is an essential part cross-sectional view showing an opening of a housing in a conventional hermetic switch;
[Explanation of symbols]
1, 11 Housing 2a, 2b, 12 Opening 3, 15 Lid 4, 18 Bolt 5, Bushing hole 6, Switch 7, 14, Flange 8, O-ring groove 9, 17 O-ring 13, Neck 16a, 16b Guide 19 Nut 20, 22 , 24 Gaskets 20a, 20b, 22a, 22b, 22c, 22d, 24a, 24b, 24c, 24d Projections 21a, 21b, 23a, 23b, 25 Spacer

Claims (10)

A housing in which the electric device body is housed and has an opening;
A lid for closing the opening of the housing,
The opening of the housing is provided with a neck portion and a flange portion whose outer periphery is parallel to the side surface of the housing and extends outward.
A guide is provided on the inner peripheral side and the outer peripheral side by providing a predetermined interval between the facing surface of the lid facing the flange portion,
An O-ring is provided between the inner and outer guides,
Fastening means for compressing the O-ring and bringing the O-ring into close contact with the lid and the flange portion. The fastening means, a plurality of bolts penetrating from the lid to the flange portion via the outer peripheral side guide,
The enclosure according to claim 1, comprising a plurality of nuts provided on a surface of the flange portion facing the enclosure. The enclosure according to claim 1, wherein a compression ratio of the O-ring is set to be less than 5% to less than 25% by making the height of the guide lower than a diameter of the O-ring. A housing in which the electric device body is housed and has an opening;
A lid for closing the opening of the housing,
The opening of the housing is provided with a neck portion and a flange portion whose outer periphery is parallel to the side surface of the housing and extends outward.
A gasket having a semicircular cross section on both surfaces in the circumferential direction between a surface facing the lid and a surface facing the flange, and a spacer for sandwiching the gasket on both surfaces on the outer periphery of the projection of the gasket. And
Fastening means for compressing the two-sided projections of the gasket and bringing them into close contact with the lid and the flange, respectively. Protrusions of the gasket are provided on both sides of the spacer,
The enclosure according to claim 4, further comprising: a fastening unit that compresses the convex portions on both sides and both sides of the gasket so as to be in close contact with the lid and the flange. The fastening means comprises a plurality of bolts penetrating from the lid to the flange portion via the gasket, spacers provided on both surfaces of the gasket, and a plurality of nuts provided on the flange portion surface facing the housing. The sealed electrical equipment housing according to claim 4 or claim 5, wherein The hermetically sealed electric device according to claim 4, wherein the compression ratio of the convex portion is set to 5% to less than 25% by making the height of the spacer lower than the height of the convex portion. Housing. A housing in which the electric device body is housed and has an opening;
A lid for closing the opening of the housing,
The opening of the housing is provided with a neck portion and a flange portion whose outer periphery is parallel to the side surface of the housing and extends outward.
Between the facing surface of the lid facing the flange portion, a gasket integrally molded with the spacer is provided on both sides in the circumferential direction and on both sides sandwiching the spacer, with a convex portion having a semicircular cross section,
Fastening means for compressing the convex portions on both sides and both sides of the gasket and bringing them into close contact with the lid and the flange portion, respectively. The fastening means, a plurality of bolts penetrating from the lid to the flange portion via the spacer,
The sealed electric device housing according to claim 8, comprising a plurality of nuts provided on the flange portion surface facing the housing. The hermetically sealed electric device according to claim 8, wherein the compression ratio of the convex portion of the gasket is set to be 5% to less than 25% by making the distance between the tops of the double-sided convex portions larger than the height of the spacer. Equipment housing.

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