Improved Compression Seal Gas Gasket and Sealing System

Abstract

The present invention relates to a compression seal gasket. The compression seal gasket (14, 141) includes a body portion (141) that extends generally flat or in a plane, the body portion (141) including an inner surface (22, 32), an outer surface (20, 30), and end faces (24, 26, 34, 36), the end faces defining the extent of the gasket along an axis (AA') perpendicular to the plane, connecting the inner surface and the outer surface, the gasket being made of an elastomeric material, the body portion having a first length (L 14 ) along the axis (AA'), at least one of the inner surface and the outer surface being provided with a lip (141) having a second length (l 14 ) along the axis (AA') perpendicular to the plane, the second length (l 14 ) being shorter than the first length (L 14 ).

Description

Technical Field

[0001] The present invention relates to a compression seal gasket designed to be difficult for gas and / or external water or water vapor to permeate. This seal gasket is used at the connection between two components in medium-voltage and high-voltage gas-insulated devices.

Background Art

[0002] Among medium-voltage and high-voltage devices, there are devices having hollow components in which conductors are arranged.

[0003] The hollow component is filled with an insulating gas, which insulates the conductor carrying current at high voltage from the hollow component at ground potential.

[0004] The insulating gas can also withstand the electric field applied to the short intervals between the conductors arranged within the component.

[0005] The connection between two components has, for example, a tubular portion of each component and a seal gasket arranged between the tubular portions.

[0006] In known embodiments, the seal gasket is made of an elastomer and is compressed between components (for example, between two tubular components or between one tubular component and a flat plate).

[0007] When compressed by two components, elastic deformation occurs in the gasket, improving the airtightness of the connection.

[0008] However, the gasket is generally made of an elastomer that is permeable to the insulating gas.

[0009] One object of the present invention is to provide a seal gasket with a sufficiently low permeability in order to reduce the leakage amount of the completed device.

[0010] The goal is to achieve a leakage rate of less than 0.5% by volume per year for the entire device, as described in the relevant IEC standards for switchgear (for example, IEC 62271-203 for gas-insulated switchgear).

[0011] This improvement is particularly interesting because the industry is transitioning to insulating gases composed of gases or gas mixtures, and these insulating gases may leak differently due to the different properties of the new molecules used compared to the mainstream SF6 gas that has been used for decades.

[0012] In particular, the gas used as an alternative to SF6 is a gas called "g3" that contains heptafluoroisobutyronitrile mixed with a diluent gas containing carbon dioxide and oxygen. CO2 has a tendency to leak easily. O2 and N2 also leak, but not as easily as CO2. These three gases leak more easily than SF6. These leaks are a problem because CO2 has an adverse impact on the environment. Furthermore, it is necessary to replenish the lost gas, which further increases the cost of maintenance work.

[0013] Another object of the present invention is to provide an improved sealing gasket with significantly low permeability to heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-(CAS No 756-12-7)) and / or CO2 and / or O2 and / or N2, and / or water or water vapor. The sealing gasket is used particularly in gas-insulated devices of the above type or gas-insulated devices described in the present application, and more generally in high-voltage or medium-voltage components (such as circuit breakers, switches, circuit breakers, or gas-insulated lines) implemented in medium-voltage or high-voltage applications.

[0014] In fact, such gases are - heptafluoroisobutyronitrile alone, or heptafluoroisobutyronitrile mixed with O2 and / or CO2 and / or N2 - and / or heptafluoroisopropyl trifluoromethyl ketone alone, or heptafluoroisopropyl trifluoromethyl ketone mixed with O2 and / or CO2 and / or N2, - or CO2 alone, or CO in a mixture with O2 and / or N2 2、 - N2 alone, or N2 in a mixture with O2 and / or CO2 can be included.

[0015] Furthermore, since H2O is not desirable inside such a device, another object of the present invention is to provide a sealing gasket that reduces, limits, or avoids the penetration of H2O from the outside of such a gas-insulated device implemented in medium-voltage or high-voltage applications.

Prior Art Documents

Patent Documents

[0016]

Patent Document 1

Summary of the Invention

[0017] The present invention relates to a gasket, a sealing gasket, a sealing system, a sealing gasket system, a compressed sealing gasket, or a compressed sealing gasket system (any of these expressions can be used in the remainder of this specification), and the gasket, the sealing gasket, the sealing system, the sealing gasket system, the compressed sealing gasket, or the compressed sealing gasket system has a body portion that extends generally flat or in a plane, includes an inner surface and an outer surface, and includes a body portion made of an elastomeric material, and the body portion has a first length (or a first thickness) (L) along an axis perpendicular to the plane 14) and at least one of the inner surface and the outer surface includes a lip having a second length (or second thickness) along the axis perpendicular to the plane, and the second length (or second thickness) is shorter than the first length (or first thickness).

[0018] The lip provides a small surface area against gas and / or water penetrating in a direction included in the plane of the main body portion. The lip and the main body portion are preferably homogeneous with respect to composition.

[0019] Permeation (where molecules pass through the gasket by diffusion) is related to the surface area under pressure. Since the lip has a small length or thickness in the direction along the axis perpendicular to the surface on which the gasket spreads, the surface area for permeation is small.

[0020] The main body portion has a large length in the direction along the axis and can cope with aging, thermal expansion, manufacturing tolerances, handling in the factory, and environmental constraints.

[0021] The gasket, seal gasket, seal gasket system, compression seal gasket, compression seal gasket system according to the present invention can efficiently seal heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-(CAS No 756-12-7)) and / or CO2 and / or O2 and / or N2 and / or oxygen-containing compounds and / or water vapor and / or leakage of inflowing water and / or leakage of inflowing water vapor. For example, in applications using a gas containing both CO2 and a fluorine compound (heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone) at a pressure between 1 bar and 20 bar, it can efficiently seal the leakage.

[0022] According to a preferred embodiment, the lip has a higher compression ratio or average compression ratio than the main body portion (141).

[0023] Preferably, - The first length (or the thickness of the gasket) is a value between 2 mm and 25 mm, - And / or the second length is a value between 0.5 mm and 5 mm.

[0024] The gasket, sealing gasket, sealing gasket system, compression sealing gasket, compression sealing gasket system according to the present invention can have an inner dimension (dimension of the inner part of the gasket) having a value, for example, between 40 mm (or 100 mm) and 500 mm (or 1300 mm).

[0025] For example, when the gasket has an annular shape, the inner diameter of the gasket can have a value between 40 mm or 100 mm and 500 mm or 1300 mm.

[0026] The gasket, sealing gasket, sealing gasket system, compression sealing gasket, compression sealing gasket system according to the present invention is adapted to the joint between both components, and at least one of the components includes a recess including a first part for receiving the main body part and, optionally, a second part for receiving the lip.

[0027] Each of the above parts can have a rectangular shape, and the length of the first part along the axis perpendicular to the plane of the gasket is equal to, longer than, or shorter than the length of the second part along the axis.

[0028] In a specific embodiment of the gasket, sealing gasket, sealing gasket system, compression sealing gasket, or compression sealing gasket system according to the present invention, - The outer surface and the inner surface are parallel and / or coaxial with each other, - And / or, the gasket has an annular shape, an oval shape, or an elliptical shape in a plane perpendicular to the axis (AA').

[0029] In another embodiment of the gasket, seal gasket, seal gasket system, compressed seal gasket, and compressed seal gasket system according to the present invention, at least one of the outer surface, the inner surface, and the end surface that defines the axial range of the gasket and connects the inner surface and the outer surface has a wavy or corrugated shape.

[0030] In a specific embodiment of the gasket, seal gasket, seal gasket system, compressed seal gasket, and compressed seal gasket system according to the present invention, lips can be provided on each of the inner surface and the outer surface.

[0031] In another specific embodiment of the gasket, seal gasket, seal gasket system, compressed seal gasket, or compressed seal gasket system according to the present invention, the lip has a surface that is perpendicular to the axis and extends in the same plane as one of the end surfaces of the end surface, and the gasket is "L"-shaped.

[0032] In another specific embodiment of the gasket, seal gasket, seal gasket system, compressed seal gasket, or compressed seal gasket system according to the present invention, the length (or thickness) L of the main body 14 can be made larger than the distance between the inner surface and the outer surface of the main body (the distance measured in a plane perpendicular to the axis AA' or the plane of the gasket). This applies to the "L"-shaped gasket, but also to other embodiments.

[0033] Furthermore, the present invention relates to a gasket, a compression seal system, a seal gasket, a seal gasket system, a compression seal gasket, and a compression seal gasket system, which include two gaskets according to the present invention connected in series, and the lip of one of the two gaskets is connected to one of the inner and outer surfaces of the other of the two gaskets. For example, the lip of the inner surface of one of the two gaskets is connected to the outer surface of the other gasket, or the lip of the outer surface of one of the two gaskets is connected to the inner surface of the other gasket.

[0034] Furthermore, the present invention relates to a sealing system, a sealing gasket system, a compression sealing gasket, or a compression sealing gasket system, which includes two components, each component has an end face or an assembly face facing the end face or the assembly face of the other component, at least one of the end faces or the assembly faces has the above-mentioned recess, and at least a part of the gasket, the compression seal gasket, the seal gasket, the seal gasket system, or the compression seal gasket system according to the present invention is disposed in the recess. A part (for example, one or more lips) of the compression seal gasket can be disposed outside the recess.

[0035] Preferably, the gasket, the compression seal gasket, the seal gasket, the seal gasket system, or the compression seal gasket system is axially compressed by the end face or the assembly face.

[0036] The end faces or the assembly faces of the two components may or may not be in contact with each other, for example, at least in the region surrounding the recess and / or the gasket (in this case, a part of the gasket (for example, one or more lips, or at least a part of one or more lips) may not be able to be disposed in the recess).

[0037] The component can form part of the gas-insulated portion of a high-voltage or medium-voltage device, and the gas-insulated portion contains or is intended to contain a gas at a pressure between, for example, 1 bar and 20 bar, and the gas is, for example, at least - a gas such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-(CAS No 756-12-7)), optionally mixed with a gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound or a diluent gas, - or at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound, and includes and / or the gas-insulated portion is or is intended to be surrounded by an external atmosphere containing water and / or water vapor.

[0038] The component is at least partially cylindrical and can be arranged coaxially with respect to the main axis AA', and the end face or mating face of each component extends in a plane perpendicular to the main axis AA'.

[0039] The present invention also relates to a method for insulating the gas-insulated portion of a high-voltage or medium-voltage device, the gas-insulated portion containing, for example, a gas containing at least a fluorine compound (for example, heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone, optionally mixed with a gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor), or the gas contains, for example, at least CO2 and / or O2 and / or N2 and / or a fluorine compound (for example, heptafluoroisobutyronitrile), The gas-insulated portion includes a gasket, a sealing system, a sealing gasket, a sealing gasket system, a compression sealing gasket, or a compression sealing gasket system according to the present invention, and / or the gas-insulated portion is surrounded, or is intended to be surrounded, by an external atmosphere containing water and / or water vapor.

[0040] The present invention also relates to a method for insulating a gas-insulated portion of a high-voltage or medium-voltage device, the gas-insulated portion being at least a gas, - a fluorine compound (e.g., heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone, optionally mixed with a gas or diluent gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor) - or, CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor, containing a gas, and / or the gas-insulated portion is surrounded, or is intended to be surrounded, by an external atmosphere containing water and / or water vapor, The gas-insulated portion includes two components, at least one of the two components having a recess as described above, each of the two components including an end face or an assembly face facing the end face or the assembly face of the other component, and at least a part of a gasket, a compression seal gasket, a seal gasket, a seal gasket system, a compression seal gasket system, or a seal system according to the present invention is disposed in the at least one recess and compressed between the end faces or the assembly faces of the two components.

[0041] The present invention also relates to a method for insulating a gas-insulated portion of a high-voltage or medium-voltage device, wherein the gas-insulated portion contains at least a gas containing CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor and / or a fluorine compound (for example, heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone), and the gas-insulated portion is surrounded by, or is intended to be surrounded by, an external atmosphere containing water and / or water vapor. The gas-insulated portion includes a gasket according to the present invention, a sealing system according to the present invention, a sealing gasket, a sealing gasket system, a compressed sealing gasket, or a compressed sealing gasket system.

[0042] The gas is contained in the device at a pressure between 1 bar and 20 bar.

Brief Description of the Drawings

[0043]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0044] Figure 1 shows an example of a system according to the present invention to which the gasket according to the present invention, a compression - seal gasket, a seal gasket, a seal - gasket system, a seal system, or a compression - seal gasket system can be applied. The figure shows a part of a high - voltage device including components 10, 10' assembled to each other. Here, each component 10, 10' is represented as a cylindrical and tubular component and extends coaxially with the main axis AA' of the high - voltage device. It can be understood that the two components may have other shapes. For example, the two components may be non - cylindrical tubular parts.

[0045] Alternatively, one or both of the two components may not be tubular parts (e.g., the hole 100 of the gas compartment (Figure 9) closed by the flange 101).

[0046] Alternatively, the gasket according to the present invention, a compression - seal gasket, a seal gasket, a seal - gasket system, a seal system, or a compression - seal gasket system can be used, for example, at the joint between two flanges. Although the following description refers to tubular elements, the present invention is particularly applicable to other pairs of elements, especially pairs of elements where the joint between the elements of the pair must be sealed. - Gases such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also known as 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)- (CAS No 756-12-7)), optionally mixed with a gas or diluent gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound, - Or a gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor, - And / or the incoming water and / or incoming water vapor (the joint is surrounded or intended to be surrounded by an external atmosphere containing water and / or water vapor) Is applied to.

[0047] The gas can have a pressure (P2) between 1 bar and 20 bar (e.g., 5 bar or 15 bar).

[0048] As shown in detail in Figure 2, each component 10 includes an end face (or assembly face) 12, which faces, and in some cases is connected to, the end face (or assembly face) 12' of the other component 10'.

[0049] The gasket, seal system, compression seal gasket, seal gasket, seal gasket system, or compression seal gasket system for connecting components 10, 10' includes a gasket, seal gasket, compression seal gasket, or seal system 14 (hereinafter referred to as the gasket, seal gasket, or seal system) axially disposed between the faces 12 and 12' of the two components 10, 10' (in the example of Figure 9, between the hole 100 and the flange 101). The sealing gasket 14 extends substantially in a plane perpendicular to the axis AA'. In this example and some of the following examples, the sealing gasket has circular symmetry so as to surround the axis AA'.

[0050] The seal gasket or system includes tightening means 30 (e.g., bolts and nuts, or bolt tightening means, etc.) that axially press one component part 10 against the other component part 10'.

[0051] Also, the tightening means 30 axially compresses the seal gasket 14 and makes an airtight connection between the two component parts 10, 10'.

[0052] According to the embodiment shown in FIG. 2, the surfaces 12, 12' of each component part 10, 10' form annular recesses 16, 16' in which at least a part of the seal gaskets 14, 14' is received.

[0053] The total axial depth of the recesses 16 and 16' is smaller than the height of the gasket 14, i.e., the axial height, before the two component parts 10, 10' are assembled (the said height, i.e., the axial height, is measured along the axis AA', i.e., along the axis perpendicular to the plane in which the gasket spreads). When there is only one recess (e.g., recess 16), its axial depth is smaller than the axial height of the gasket 14 before the two component parts 10, 10' are assembled.

[0054] By compressing the gasket 14' by the tightening means 30, axial deformation occurs in the gasket 14, and pressure on the gasket 14 is maintained against the bottom surfaces of the respective recesses 16, 16'.

[0055] As can be seen from FIGS. 3A, 3B, and 4A, the gasket 14 includes a main body portion 141 made of a single material such as, for example, an elastomer (non-limiting examples include unmodified butyl rubber or modified butyl rubber, such as chlorobutyl (CIIR) or bromobutyl (BIIR) rubber).

[0056] Since this elastomer is permeable to the gas for filling the component parts 10, 10', the gas is lost over time.

[0057] As can be seen from FIGS. 3A, 3B, and 4A, a part of the main body portion 141 of the gasket 14 can have a generally rectangular shape along the axial plane including the main axis AA'.

[0058] The main body portion 141 of the gasket 14 includes a radially outer surface 20, a radially inner surface 22, and two flat end faces 24, 26 that define the axial range of the gasket 14 and connect the inner surface 22 to the outer surface 20.

[0059] One or more of the surfaces 20, 22, 24, 26 of the main body portion can be made wavy so as to improve airtightness. The waviness includes (see FIG. 4A) at least one protrusion or top 24a and at least one recess or depression or valley 24b, 24c. This complex shape generates a force that increases the contact pressure of the gasket against the surfaces of the recesses 16 and 16', resulting in a favorable effect for the gas pressure. Alternatively, the outer and inner surfaces and / or the end faces can have different shapes as shown in FIG. 5 and can be made linear (see surfaces 30, 32 or end faces 34, 36).

[0060] - A gas such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-(CAS No 756-12-7)), optionally mixed with a gas or diluent gas containing at least CO2 and / or O2 and / or N2 and / or water vapor and / or an oxygen-containing compound, - Or, a gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor, - And / or, inflowing water and / or inflowing water vapor (the joint or the system is intended to be surrounded by or be surrounded by an external atmosphere containing water and / or water vapor), In order to make it difficult for gas to permeate through the gasket, at least one (or both) of the outer surface 20 and the inner surface 22 may include a lip 142 (an inner lip in the example of FIG. 3A) that can be substantially rectangular in a plane including the axis AA' (as can be seen from FIGS. 3A, 3B, 4A, and 5, other shapes are also possible. For example, as can be seen from FIGS. 11A and 11B, a shape that is at least partially rounded or a shape that is at least partially circular or semi-circular is also possible.). Preferably, the lip and the main body portion have the same composition (referring to the example of the material of the main body portion above, the lip is preferably formed of the same material as the main body portion), and thus, the composition of the gasket is homogeneous.

[0061] The inner lip has a length (or thickness) l measured along an axis parallel to the axis AA'. 14 And has a length l 14 Is shorter than the length (or thickness) L of the main body portion along the same axis 14 For example, the length (or thickness) L 14 Is 50% or less of the length. The smaller the length (or thickness) l 14 (Or cross-sectional area), the better the efficiency.

[0062] For example, the length (or thickness) L of the main body portion 14 Is a value between 3 mm and 25 mm, and the length (or thickness) l of the lip 14 (<L 14 ) Is a value between 0.5 mm and 5 mm.

[0063] The lip 142 has a surface area S2 that is smaller than the surface area S1 of the inner surface 22 and / or the outer surface 21 of a known gasket (FIG. 4B) without the lip 142 with respect to gas (especially the gases in the above list) that penetrates from a direction perpendicular to the axis AA' and / or inflowing water and / or water vapor.

[0064] Permeation (the passage of molecules through the gasket) is related to the surface area under pressure, and since the length l of the lip 142 14 Is small, the surface area S2 for permeation is small.

[0065] In the embodiments of FIGS. 3A and 4A, the lip is an inner lip directed towards the portion of the device having the highest pressure P2 under the use conditions (the external pressure P1 of the device < P2).

[0066] In other embodiments, for example as shown in FIG. 3B, the lip is an outer lip directed towards the outer portion of the device having the lowest pressure P1 under the use conditions. A gasket having an outer lip as shown in FIG. 3B is particularly efficient in restricting or preventing the permeation of water and / or water vapor of H2O from the outside of the device provided with the gasket, and is also efficient for gases (particularly the gases in the aforementioned list) permeating from a direction perpendicular to the axis AA'.

[0067] Although a temporary reversal of the direction of the pressure difference is allowed depending on the design of the present invention, it is preferable that the amplitude is low ((P1 - P2) < 2 bar). It is preferable that the device can withstand a vacuum (the inside of the device (P2) is 0 bar in absolute pressure. The outside of the device (P1) is 1 bar in absolute pressure) before filling..

[0068] The width w of the gasket (the path of the gas passing through the gasket) is measured along an axis perpendicular to the axis AA' in the plane including the axis AA', and the width w is, for example, a value between 4 mm and 10 mm or 40 mm.

[0069] In any embodiment according to the present invention, the width w = w 141 + w 142 where w 141 (w 142 ) is the width of the main body portion 141 (the width of the lip 142), and w 141 and w 142 (for example w 141 ≧ w 142 ) are both in the plane including the axis AA' but are measured along an axis perpendicular to AA'. Preferably, w 142 ≧ 35% × w 141 , or w 141 ≧ w 142 ≧ 35% × w 141(The longer the path of the gas passing through the gasket, the higher the efficiency of the gasket).

[0070] The main body portion 141 performs several functions. It is adapted to maintain sufficient pressure on the surface to ensure airtightness, taking into account thermal expansion, aging deterioration, manufacturing tolerances, and environmental constraints. Also, during the assembly process, the gasket can be easily handled.

[0071] The inner or outer lip 142 preferably has an average compression ratio (for example, between 15% and 40%) that is higher than the average compression ratio of the main body portion 141 of the gasket (for example, between 10% and 25%). Each of the recesses 161, 162 is preferably designed such that the lip is compressed more than the main body portion of the gasket. This allows for reliable and sufficient compression, preferably under all conditions and with respect to the above constraints. Note that in the main body portion, the portion A1 (see FIG. 4A) having the constraints by the recesses 24b, 24c has a lower compression ratio than the largest portion A2.

[0072] The recess of the gasket according to the present invention has a length (or thickness) L 16 measured along an axis parallel to the axis AA' and a first large parallelepiped shape (in the main body portion of the gasket), and has a length (or thickness) l 16 measured along an axis parallel to the axis AA' and a second small parallelepiped shape, where l 16 <L 16 and is a second small parallelepiped shape having.

[0073] Preferably, the ratio l 16 / l 14 is a value between 0.60 and 0.85, and / or the ratio L 16 / L 14 is a value between 0.75 and 0.9.

[0074] Generally, the ratio l 16 / l 14 <L16 / L 14 is preferred (to make the compression rate of the lip higher than that of the main body).

[0075] Figures 6A and 6B show specific embodiments of a gasket or gasket system according to the present invention, and include the following two gaskets according to the present invention connected in series. A first (outer) gasket, (see Figures 6A and 6B): a main body portion 14a (having a length or thickness L 14 and a width w 141 ), and an inner lip 14’a (having a length or thickness l 14 and a width w 142 ), or (see Figure 6B): a main body portion 14a (having a length or thickness L 14 and a width w 141 ), an outer lip 14’a1 (having a length or thickness l 141 and a width w’ 142 ), and an inner lip 14’a (having a length or thickness l 14 and a width w 142 ), the first (outer) gasket, and a second (inner) gasket, (see Figures 6A and 6B): a main body portion 14b (having a length or thickness L’ 14 and a width w’ 141 ), and an inner lip 14’b (having a length or thickness l’ 14 and a width w 142a ), wherein the inner lip 14’a of the first (outer) gasket is connected to the outer surface of the main body portion 14b of the second (inner) gasket, the second (inner) gasket.

[0076] In both embodiments of Figures 6A and 6B, the inner gasket is located on the side of the device having the highest pressure P2 under the operating conditions (the external pressure P1 of the device < P2).

[0077] The first (outer) gasket is the second (inner) gasket (D in Figures 6A and 6B 14b) has a greater length in the horizontal direction than (D in Fig. 6A 14a , D' in Fig. 6B 14a ).

[0078] These two gaskets are adapted to the corresponding double recesses 16a, 16b, 16'a, 16'b as shown in Figs. 6A and 6B.

[0079] The double structure of the gasket or gasket system in Figs. 6A and 6B ensures very high airtightness against the gas on the pressure side of the device (at pressure P2 (>P1)).

[0080] Length or thickness L 14 , l 14 , L' 14 , l' 14、 l 141 each is 、 measured along an axis parallel to the AA' axis.

[0081] l 14 and l 141 each is smaller than the length (or thickness) L 14 , for example, smaller than 50% of the length (or thickness) L 14 .

[0082] l' 14 is smaller than the length (or thickness) L' 14 , for example, smaller than 50% of the length (or thickness) L' 14 .

[0083] Preferably, l 14 = l 141 = l' 14 and / or L 14 = L' 14 .

[0084] The above considerations regarding the width of the main body portion and the width of the lip are applicable to the embodiments of Fig. 6A or Fig. 6B and preferably are as follows. ·w 142 ≧35%×w 141 or w' 142 ≧35%×w141 ; or w 141 ≥ w 142 ≥ 35% × w 141 or w 141 ≥ w’ 142 ≥ 35% × w 141 or w 142 + w’ 142 ≥ 35% × w 141 or w 141 ≥ w 142 + w’ 142 ≥ 35% × w 141 · and / or: w 142a ≥ 35% × w’ 141 or w’ 141 ≥ w 142a ≥ 35% × w’ 141

[0085] Figure 7A is a front view (or a view within the plane of the gasket) in a plane perpendicular to the axis (AA’) of a circular or annular gasket or gasket system according to the present invention. It has an inner diameter D1 (the inner diameter of the lip 141), and the inner diameter D1 can be, for example, a value between 40 mm or 50 mm or 100 mm and 500 mm or 1300 mm. Such a large gasket is more important in terms of airtightness than a normal small gasket (a gasket with a diameter between 10 mm and 40 mm).

[0086] Alternatively, the gasket or gasket system according to the present invention has an elongated shape, an oval shape, or an ellipsoidal shape (Figure 7B) in a plane perpendicular to the axis (AA’) (or within the plane of the gasket), and has a maximum inner diameter dimension D2, for example, between 40 mm or 50 mm or 100 mm and 500 mm or 1300 mm.

[0087] Generally (for any embodiment of the gasket or gasket system according to the present invention): - The lip extends along the entire length (or the entire inner or outer circumference) of the inner or outer surface of the main body of the gasket. - And / or, the lip is formed of the same material as the main body.

[0088] Figures 8A, 9A, and 9B show modified examples of the present invention at the joint between two parts 10, 10'. These gaskets are "L"-shaped and the lip 142 has a surface 140 which is perpendicular to the AA' axis and extends in the same plane as one of the lateral end faces 24, 26 of the main body portion 142 of the gasket.

[0089] Figure 8B shows the gasket of Figure 8A located within the corresponding "L"-shaped recess. In the embodiment of Figure 8B, only one of the two parts 10, 10' has a recess.

[0090] In the embodiment of Figure 9C, only the main body portion of the gasket of Figure 9A or 9B, or a part of the main body portion, is located within the recess. As can be seen from this figure, the assembly surfaces of the two parts or two components (different from Figures 2, 3A, 3B, 6A, 6B) are not in contact with each other at least in the region around the recess and / or the gasket. More generally (when the gasket is "L"-shaped or other shapes), at least in the region around the recess and / or the gasket, at least a part of the end faces or assembly surfaces of the two components can - be in contact with each other, - or can be made not to contact each other. In this last case, a part of the gasket (for example, one or more lips, or at least a part of one or more lips) does not exist within the recess but can be located, for example, between the assembly surfaces.

[0091] These embodiments of Figures 8A, 8B, 9A - 9C can be adapted, for example, to small gaskets having an inner dimension or inner diameter between 40 mm (or 50 mm) and 200 mm, enabling a more compact mounting than the previously presented embodiments. The small gasket can be replaced with an O-ring and can be incorporated more easily than the gaskets described above in relation to the previous figures.

[0092] As shown in FIGS. 9A to 9C, the main body portion of the gasket according to the present invention has a length L of the main body portion (or thickness or axial height) that is longer than the distance between the inner surface 22 and the outer surface 20 of the main body portion (the distance measured in a plane perpendicular to the axis AA' or in the plane of the gasket). 14 This can be applied to an "L"-shaped gasket, but it can also be applied to other embodiments.

[0093] The gasket according to the present invention can be formed by injecting an unvulcanized (or uncured) material into a mold and then performing a compression step.

[0094] The present invention is applied to, for example, switches, circuit breakers, disconnectors, transformers, surge arresters, or gas-insulated lines.

Explanation of reference numerals

[0095] 14a Main body portion 14b Main body portion 16a Double recess 21 Outer surface 34 End face 100 Hole 101 Flange 140 Surface 161 Recess l14 Length l16 Ratio

Claims

1. A sealing system comprising two components (10, 10', 100, 101) of gas-insulated parts of high or medium voltage equipment, each component (10') having an end face or assembly face (12', 102) facing an end face or assembly face (12, 101) of the other component (10), at least one assembly face including at least one recess (16), at least one compression seal gasket (14, 14') being at least partially disposed in said at least one recess and compressed between the assembly faces (12, 12', 101, 102) of the two components (10, 10'), said compression seal gasket (14, 14') being at least partially disposed in said at least one recess and compressed between said ... １ ) is a body portion (14) that extends generally flat or in a plane. １ ) having a body portion (14) including inner surfaces (22, 32), outer surfaces (20, 30), and end surfaces (24, 26, 34, 36). １ ), the end surface defines the gasket along an axis (AA′) perpendicular to the plane and connects the inner surface and the outer surface, the body portion is made of an elastomeric material, and the body portion has a first length (L 1 ) along the axis (AA′). １４ ), and at least one of the inner surface and the outer surface has a second length (l) along the axis (AA') perpendicular to the plane. １４ ) having a lip (14) １ ), and the second length (l １４ ) is the first length (L １４ ) shorter than the seal system.

2. The first length (L １４ ) is a value between 3 mm and 25 mm, the seal system according to claim 1.

3. Said second length (l １４ ) is a value between 0.5 mm and 5 mm, the sealing system according to claim 1 or claim 2.

4. l １４ ≤ 50% × L １４ The sealing system according to any one of claims 1 to 3, wherein this is the case.

5. The main body has a first width w １４１ and the lip has a second width w １４２ Both widths are measured along an axis perpendicular to the AA' axis in a plane containing the AA' axis, and w １４２ ≧ 35% × w １４１ The sealing system according to any one of claims 1 to 4, wherein the sealing system is

6. The gasket has a maximum inner dimension (D １ - D ２ ) between 50 mm and 1300 mm, the sealing system according to any one of claims 1 to 5.

7. The lip (14 ２ ) has a higher average compression ratio than the main body (14 １ ), the seal system according to any one of claims 1 to 6.

8. The outer surfaces (20, 30) and the inner surfaces (22, 32) are parallel to each other and / or coaxial with each other, and / or, the gasket has an annular, oval, or elliptical shape in a plane perpendicular to the axis (AA'). The sealing system according to any one of Claims 1 to 7.

9. Each of the inner surface and the outer surface is provided with a lip (14'a, 14'a １ ). The seal system according to any one of claims 1 to 8

10. The sealing system according to any one of Claims 1 to 9, wherein at least one of one of the end faces (24, 26, 34, 36) and the outer surface (20) and the inner surface (22) is wavy.

11. The lip (14 ２ ) has a plane perpendicular to the (AA') axis and extending in the same plane as one of the end faces (24, 26, 34, 36), the sealing system according to any one of claims 1 to 10.

12. Including a second seal gasket (14'), the second seal gasket (14') has a body portion (14 １ ) that extends generally flat or extends in a plane, the body portion (14 １ ) including an inner surface (22, 32), an outer surface (20, 30), and end faces (24, 26, 34, 36), the end faces defining the extent of the gasket along an axis (AA') perpendicular to the plane, connecting the inner surface and the outer surface, the gasket being made of an elastomeric material, the body portion having a first length (L １４ ) along the axis (AA'), at least one of the inner surface and the outer surface having a lip (14 １４ ) having a second length (l １ ) along the axis (AA') perpendicular to the plane, the second length (l １４ ) being shorter than the first length (L １４ ), the two seal gaskets being arranged in series, and a lip (14'a) of one of the two seal gaskets being connected to the inner surface or the outer surface of the other of the two seal gaskets. The compressed seal gasket system according to any one of claims 1 to 11.

13. The gas-insulated portion includes at least a gas - A gas such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)- (CAS No 756-12-7)), optionally at least CO ２ and / or O ２ and / or N ２ and / or a gas containing an oxygen-containing compound or a mixture with a diluent gas - or at least CO ２ and / or O ２ and / or N ２ and / or a gas containing an oxygen-containing compound and / or water vapor containing a gas including, or intended to include, and / or the gas-insulated portion is surrounded by, or intended to be surrounded by, an atmosphere containing water and / or water vapor. The sealing system according to any one of Claims 1 to 12.

14. The sealing system according to any one of Claims 1 to 13, wherein the gas-insulated portion forms part of a switch, a circuit breaker, a disconnector, a transformer, a surge arrester, or a gas-insulated line.

15. A method of insulating a gas-insulated portion of a high-voltage or medium-voltage device, the portion including at least a gas - a gas such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also called 2-butanone, 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-(CAS No 756-12-7)), optionally mixed with a gas containing at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound or a diluent gas, - or at least CO ２ and / or O ２ and / or N ２ and / or a gas containing an oxygen-containing compound and / or water vapor containing a gas including, and / or the gas-insulated portion is surrounded by, or intended to be surrounded by, an atmosphere containing water and / or water vapor. The method, wherein the gas-insulated portion includes the sealing system according to any one of Claims 1 to 14.

16. The method according to Claim 15, wherein the gas is contained in the device at a pressure between 1 bar and 20 bar.

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