CN1242685A

CN1242685A - Thin sheet casing with sealing elements

Info

Publication number: CN1242685A
Application number: CN 99110497
Authority: CN
Inventors: K·卡默尔; G·科尔布尔; E·穆诺兹; M·维斯特纳
Original assignee: Asea Brown Boveri AG Switzerland
Current assignee: ABB Schweiz Holding AG; ABB Asea Brown Boveri Ltd; ABB AB
Priority date: 1998-07-16
Filing date: 1999-07-16
Publication date: 2000-01-26

Abstract

The sheet-metal casing comprises at least two sheet-metal parts (1, 2) and has a plastic seal (9) arranged in between. A first sheet-metal part (1) is folded over along the seal (9) to form a fold (10) and comes into contact with the second part (2) in such a way that, in addition to the fold, a gap (13) for accommodating the seal (9) forms. The fold (10) ensures good electrical contact between the two parts (1, 2) and thus good screening. At the same time, it defines the width of the gap (13), so that the seal (9) is subjected to defined compression.

Description

The thin sheet casing of band seal

The present invention relates to the described thin sheet casing that has plastic seal of a kind of preorder according to claim.This housing is in particular for externally keeping the airtight and very important electric device of electromagnetic shielding.

Clamp between the thin plate at housing parts in known this type shell structure seal is arranged.Housing parts compresses with regard to facing toward mutually, thereby makes the seal compression.But should avoid excessively strong compression, damage to avoid seal to produce.All can cause unwelcome connection loosening but the compression of seal is too weak or seal takes place to sink.Concerning electromagnetic shielding, must add to be provided with and fill out the contact plate that covers seal clearance.

Therefore task of the present invention comes to this and designs the thin sheet casing of mentioned kind, so that this problem is avoided in simple as far as possible mode.

Task of the present invention is by finishing by the described thin sheet casing of claim 1.One of them housing parts has constituted one and has contacted along the step of this seal and with another housing parts.The selection of this device should make except the next door of the step between these housing parts, form a gap and be used to admit seal.This step has been finished two kinds of functions in this structure: it has guaranteed to form electric contact between these housing parts on the one hand, thereby guarantees good electromagnetic shielding.It has formed Mechanical Contact on the other hand, and thereby is formed on supporting area between these housing parts.If mutually facing to compressing, they just bear corresponding power so with these housing parts, and avoided the transition of seal to compress.

According to the present invention, the structure of seal area can by bending only in other words this housing parts of folding reach, simplified manufacturing like this.Preferably make thin plate curve a flanging this moment, and it has formed step, and has strengthened the marginal zone of thin plate simultaneously.

Preferably make these two housing parts in seal area to interior bending, and form sealing surface, seal just is placed between this sealing surface.Preferably make the inward flange of following housing parts crooked so in addition, so that it covers inside flanging.Reached a kind of shielding preferably thus, and reached anti-under certain condition and leak.

In order to stop water inlet also can design sealing surface so better, it is inwardly risen up.

For making two housing parts, preferably suitable take-up device to be arranged mutually facing to compressing.

Other advantage of the present invention with use by learning in relevant claim and the following the description of the drawings.Be illustrated as:

First kind of version of Fig. 1 by the thin sheet casing seal area of invention;

Second kind of version of Fig. 2 by seal area of the present invention;

Fig. 3 the third by the version with seal area of built-in seal of the present invention;

The 4th kind of version of Fig. 4 by seal area of the present invention.

Implement approach of the present invention:

Fig. 1 has represented by first kind of vertical cross-section by the structure of thin sheet casing of the present invention.Only expressed sealing area in addition.Remaining structure of housing requirement of the electric aspect of each adaptive mechanical in known manner.Housing is made up of thin plate at least in part.But those not merely also should be called thin sheet casing by the housing that thin plate is formed.

Be made up of two

metal sheets

1,2 at situation lower thin sheet housing of the present invention, they are formed by a compatibly crooked plate manufacturing respectively.

Parts

1,2 have externally been isolated the inside 3 of housing.

All curve inwardly along seamed edge 4,5 at 4 two

sheet metal plates

1,2 of seal area, and formed two

parallel sealing surfaces

7,8, plastic seal 9 just is placed between these two sealing surfaces.

Above first housing parts 1 within it edge place folding play 180 ° and form a flanging 10, this flanging is externally sealed by seal 9.Second following housing parts 2 edge within it upwards curves 90 °, constituted a hyoplastron 11.

A take-up device 12 has been arranged in the outside at housing between two

housing parts

1,2, it is

strained housing parts

1,2 relatively.

The take-up device tension time makes flanging 10 press to the sealing surface 8 of second housing parts 2, and has formed reliably between two parts and be electrically connected.Realized shielding action thus to electromagnetism intrusion and electromagnetic emission.Flanging 10 also forms Mechanical Contact between

housing parts

1,2 simultaneously.It has constituted a step 15, and this step extends along seal, and it act as apart from keeper, to form an intersegmental crack 13 between sealing surface 8,9.The size of seal 9 should make it be on the position of mild compression in crack 13 during this time along this step 15.Therefore with the irrelevant compression in accordance with regulations that can guarantee seal 9 of weight of the pulling force and the upper body parts of take-up device 12.

As shown in Figure 1, two

sealing surfaces

7,8 upwards raise towards enclosure interior 4.In case thereby water may flow to inner situation just to have stoped seal 9 to lose efficacy afterwards.

Fig. 2 has represented second kind of version of seal area.Seal 9 is horizontally extending in this case.The structure of seal area is basically corresponding to situation shown in Figure 1.But it is more that hyoplastron 11 bendings herein get, thereby it has formed a groove 14, is used to collect the water that may enter.Flanging 10 constitutes a mechanical step again, and it extends along seal 9.

These two figure have only represented two kinds of possible seal area structures.For example also can imagine, on the housing parts 2 of bottom, constitute this flanging 10 or step 15, a flanging is perhaps arranged respectively on two housing parts.Flanging itself just constitutes a groove separately to collect the water that leakage is oozed in these cases.

Fig. 3 has represented the another kind of structure of implementing of the present invention, and this moment, step 15 was not by a flanging, but was made of a step-like bending point 16 in the thin plate of first housing parts 1.Seal 9 is positioned at side within the contact zone of two housing parts in this structure.

Fig. 4 has represented the structure of a kind of Fig. 3 of being similar at last, but seal 9 is positioned at outside the contact zone of two housing parts.The thin plate of first housing parts is also curved step-likely to form step 15 herein, and this step just provides the place of placing seal 9.

For diagram is simplified, in Fig. 3 and 4, do not express take-up device 12.

Implement between two housing parts, all reached anti-atmospheric action and the good sealing of electric shield, but the manufacturing of housing to be still simple in the structure at all these.

Inside 4. seal areas, 5. first 6. second at ribs of turning back of 2. second housing parts 3. housings of first housing parts of reference symbol table 1. 8. second sealing surfaces of rib 7. first sealing surfaces, 9. seals, 10. flangings, 11. hyoplastrons, 12. take-up devices, 13. gaps, 14. grooves, 15. steps, 16. bending points of turning back

Claims

1. at least by two sheet member (1,2) form and have a thin sheet casing that is arranged in the seal (9) that is made of plastics between these sheet member, it is characterized in that, first sheet member (1) is bent to form a step (16) along seal, and contact with second sheet member (2), so that step (16) next door between first and second sheet member has a gap (13) to be used to place seal (9).

2. by the described thin sheet casing of claim 1, it is characterized in that, first sheet member (1) of housing and second sheet member (2) in seal area (4) in invagination bend into thin sheet casing, thereby they form sealing surface (7 in seal area (4), 8) to place seal (9), herein, seal (9) is between sealing surface.

3. by the described thin sheet casing of claim 2, it is characterized in that the edge of second sheet member (11) bending in seal area (4) also covers this seal area (4) facing to enclosure interior (3).

4. by each described thin sheet casing in the claim 2 or 3, it is characterized in that, above housing has one and below one, in order to prevent that into water is inwardly arranged sealing surface (7,8) facing to top rising.

5. by claim 3 and 4 described thin sheet casings, it is characterized in that, first sheet member (1) is facing to layout above the housing in seal area (4), and second sheet member (2) then arrange facing to the following of housing, and the edge (11) of second sheet member (2) is towards top and bending.

6. by one of front claim described thin sheet casing, it is characterized in that, make first (1) and second (2) sheet member tension together by take-up device (12).

7. by one of front claim described thin sheet casing, it is characterized in that seal (9) externally seals up step (15).

8. by one of front claim described thin sheet casing, it is characterized in that first sheet member is bent to a flanging (10) along seal (9), this flanging has formed step (15).