Annular metal seal, annular metal seal mounting structure, and annular metal seal mounting method

Abstract

To stably exhibit intrinsic performance of an annular metal seal by reliably tightening the annular metal seal between flat surfaces.SOLUTION: An annular metal seal 10 comprises a seal body 10a comprising a protrusion 11 in which at least one corner part corresponding to a corner R of a seal groove 4 is sharp. While a positioning ring 20 is sandwiched between the seal groove and a side surface on at least one of the inner diameter side and the outer diameter side of the seal body 10a, the positioning ring 20 is in contact with an inside side surface 4a of at least a portion of the seal groove 4. While the sharp protrusion 11 of the seal body 10a is separated from the corner R of the seal groove 4, the annular metal seal 10 is fitted into the seal groove 4. A first member 1 and a second member 2 are tightened to deform the annular metal seal 10, and thereby the inside and the outside of the annular metal seal 10 are sealed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an annular metal seal, a mounting structure for an annular metal seal, and a mounting method for an annular metal seal. [Background technology]

[0002] Conventionally, as shown in Figures 4 and 5, there has been known an annular metal seal mounting structure 103 having an annular metal seal 110 that is sandwiched between a first plane 101a of a first member 101 and a second plane 102a of a second member 102 and is pressed by bringing the first plane 101a and the second plane 102a closer to each other (see, for example, Patent Document 1).

[0003] 1, a conventional annular metal seal 110 is formed with a number of circumferentially continuous protrusions 111-114. A reaction force generated in the annular metal seal 110 generates high contact pressure between the annular metal seal 110 and the first flat surface 101a and the second flat surface 102a, thereby isolating the inside A and the outside B of the annular metal seal 110 and sealing the target fluid (gas, liquid, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-100362 A (particularly, FIG. 3) Summary of the Invention [Problem to be solved by the invention]

[0005] The annular metal seal 110 is designed on the assumption that it will be sandwiched between the first plane 101a and the second plane 102a. However, in actual use, it is often used by fitting it into a seal groove 104 carved in the first member 101, for example as shown in FIG. 5. Depending on the positional relationship between the annular metal seal 110 and the seal groove 104, it may not be possible to tighten it between the planes.

[0006] That is, this is the case where one of the pointed protrusions 111-114 of the annular metal seal 110 abuts against a corner portion (hereinafter also referred to as a corner R) of the seal groove 104. The corner R of the seal groove 104 is usually an unavoidable shape when machining the seal groove 4. In such a case, the following problems may occur.

[0007] (1) The position of the annular metal seal 110 is not stable when it is fastened, and the reaction force or contact surface pressure is not generated normally.

[0008] (2) The corners slide radially, causing damage in the path direction connecting the areas to be sealed, which causes leakage.

[0009] The present invention has been made in consideration of the above points, and its object is to ensure that the annular metal seal can stably exhibit its inherent performance by securely clamping the annular metal seal between flat surfaces. [Means for solving the problem]

[0010] In order to achieve the above object, in the present invention, the protrusions of the annular metal seal are forcibly spaced a predetermined distance from the side wall of the seal groove.

[0011] in particular, In the mounting structure of the annular metal seal of the first invention, A mounting structure for an annular metal seal in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between the inside and outside of the annular metal seal, The annular metal seal is a seal body having a protrusion with a sharp edge at least one of whose corners corresponds to a corner of the seal groove; With a positioning ring sandwiched between at least one of the inner diameter side and the outer diameter side of the seal body, the annular metal seal is fitted into the seal groove in a state in which the positioning ring abuts against an inner side surface of at least a portion of the seal groove and a sharp protrusion of the seal body is spaced away from a corner portion of the seal groove; The inside and outside of the annular metal seal are sealed by fastening the first member and the second member together to deform the annular metal seal.

[0012] According to the above configuration, by sandwiching the positioning ring, the positioning ring abuts against at least a part of the inner side surface of the seal groove, and a gap is secured between the side surface of the seal body on the pointed ridge side and the tip of the pointed ridge, so that the pointed ridge does not come into contact with the corner of the seal groove. Therefore, the position of the annular metal seal is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, the corner does not slip in the radial direction, and the path direction connecting the areas to be sealed is not scratched, and no leakage occurs. "The positioning ring abuts against at least a part of the inner side surface of the seal groove" means that the positioning ring may abut only part of the circumference, not the entire circumference.

[0013] In the second invention, in the first invention, The radial thickness of the positioning ring is equal to or greater than the radius of the corner of the seal groove.

[0014] According to the above-mentioned configuration, the positioning ring abuts against at least a portion of the inner side surface of the seal groove, so that the sharp protrusion of the annular metal seal is reliably spaced apart from the corner portion (corner R).

[0015] In a third aspect of the present invention, in the first or second aspect of the present invention, The height of the positioning ring is equal to or greater than the depth of the seal groove minus the radius of the corners of the seal groove and is equal to or less than 0.75 times the height of the annular metal seal.

[0016] According to the above-mentioned configuration, by clamping the positioning ring of an appropriate height, the sharp protrusion of the annular metal seal is reliably spaced apart from the corner portion (corner R).

[0017] The method for mounting the annular metal seal according to the fourth aspect of the present invention comprises the steps of: A method for installing an annular metal seal, in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between an inside and an outside of the annular metal seal, comprising: an annular metal seal including a seal body having a protrusion with at least one corner thereof being sharp, the protrusion corresponding to a corner portion of the seal groove; preparing a positioning ring having an outer diameter smaller than the inner diameter of the seal body or a positioning ring having an inner diameter larger than the outer diameter of the seal body; the positioning ring is brought into contact with an inner side surface of at least a portion of the seal groove, and the annular metal seal is fitted into the seal groove in a state in which the pointed protrusion of the seal body is spaced away from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal.

[0018] According to the above configuration, by sandwiching the positioning ring, the positioning ring abuts against at least a part of the inner side surface of the seal groove, and a gap is secured between the side surface of the seal body on the pointed ridge side and the tip of the pointed ridge, so that the pointed ridge does not come into contact with the corner of the seal groove. Therefore, the position of the annular metal seal is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, the corner does not slip in the radial direction, and the path direction connecting the areas to be sealed is not scratched, so that no leakage occurs.

[0019] In addition, in the fifth invention, An annular metal seal that is fitted into an annular seal groove of a first member and is pressed and deformed by a second member, a seal body having a protrusion with at least one corner sharpened to correspond to a corner of the seal groove; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, A gap is provided between the side surface of the positioning projection on the side of the pointed ridge of the seal body and the tip of the pointed ridge to prevent contact with the corner portion of the seal groove.

[0020] According to the above configuration, the positioning protrusion is provided so that the positioning protrusion abuts against at least a part of the inner side surface of the seal groove, and a gap is secured between the side surface of the seal body on the pointed ridge side and the tip of the pointed ridge, so that the pointed ridge does not come into contact with the corner of the seal groove. Therefore, the position of the annular metal seal is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, the corner does not slip in the radial direction, and the path direction connecting the areas to be sealed is not scratched, and no leakage occurs. "The positioning protrusion abuts against at least a part of the inner side surface of the seal groove" means that the positioning protrusion may abut only a part of the circumferential direction, not the entire circumference.

[0021] In the sixth aspect of the present invention, in the fifth aspect of the present invention, The seal body has an X-shaped cross section, The positioning projection is provided at the height direction middle of at least one of the inner diameter side and the outer diameter side of the seal body.

[0022] According to the above-mentioned configuration, the sharp protrusions are reliably prevented from coming into contact with the corners of the seal groove with a simple structure.

[0023] In the mounting structure of the annular metal seal of the seventh invention, A mounting structure for an annular metal seal in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between the inside and outside of the annular metal seal, The annular metal seal is a seal body having a protrusion with at least one corner sharpened to correspond to a corner of the seal groove; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, the annular metal seal is fitted into the seal groove in a state in which the positioning projection abuts against at least a portion of an inner side surface of the seal groove and a sharp protrusion of the seal body is spaced from a corner portion of the seal groove; The inside and outside of the annular metal seal are sealed by fastening the first member and the second member together to deform the annular metal seal.

[0024] According to the above configuration, the positioning protrusion is provided so that the positioning protrusion abuts against at least a part of the inner side surface of the seal groove, and a gap is secured between the side surface of the seal body on the pointed ridge side and the tip of the pointed ridge, so that the pointed ridge does not come into contact with the corner of the seal groove. Therefore, the position of the annular metal seal is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, the corner does not slip in the radial direction, and the path connecting the areas to be sealed is not damaged, so that no leakage occurs.

[0025] In an eighth aspect of the present invention, in the seventh aspect of the present invention, The amount of radial projection of the positioning projection is equal to or greater than the radius of the corner portion of the seal groove.

[0026] According to the above configuration, the positioning projection abuts against at least a portion of the inner side surface of the seal groove, thereby reliably separating the sharp protrusion of the annular metal seal from the corner portion (corner R).

[0027] In a ninth aspect of the present invention, in the seventh or eighth aspect of the present invention, The height of the positioning projection is equal to or greater than the height of the annular metal seal minus twice the radius of the corner of the seal groove and is equal to or less than 0.75 times the height of the annular metal seal.

[0028] According to the above-mentioned configuration, by providing a positioning protrusion of an appropriate height, the sharp protrusion of the annular metal seal is reliably spaced apart from the corner portion (corner R).

[0029] In the tenth invention, a method for mounting an annular metal seal is provided. A method for installing an annular metal seal, in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between an inside and an outside of the annular metal seal, comprising: a seal body having a protrusion with at least one corner sharpened to correspond to a corner of the seal groove; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, preparing an annular metal seal having a gap between a side surface of the positioning projection on the side of the seal body facing the pointed protrusion and a tip of the pointed protrusion; the positioning projection is brought into contact with an inner side surface of at least a portion of the seal groove, and the annular metal seal is fitted into the seal groove in a state in which the pointed protrusion of the seal body is spaced away from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal.

[0030] According to the above configuration, the positioning protrusion is provided so that the positioning protrusion abuts against at least a part of the inner side surface of the seal groove, and a gap is secured between the side surface of the seal body on the pointed ridge side and the tip of the pointed ridge, so that the pointed ridge does not come into contact with the corner of the seal groove. Therefore, the position of the annular metal seal is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, the corner does not slip in the radial direction, and the path connecting the areas to be sealed is not damaged, so that no leakage occurs. Effect of the Invention

[0031] As described above, according to the present invention, the annular metal seal can be reliably clamped between flat surfaces, thereby allowing the annular metal seal to stably exhibit its inherent performance. [Brief description of the drawings]

[0032] [Figure 1] FIG. 3 is an enlarged cross-sectional view taken along line II in FIG. [Diagram 2]1 is a perspective view showing an annular metal seal and its periphery according to a first embodiment. [Diagram 3] FIG. 11 is a cross-sectional view according to a second embodiment, corresponding to FIG. [Figure 4] FIG. 11 is a perspective view showing an outline of a tightening structure for an annular metal seal according to a conventional example. [Diagram 5] FIG. 5 is an enlarged cross-sectional view taken along line VV in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0034] (Embodiment 1) 1 and 2 show an annular metal seal mounting structure 3 including an annular metal seal 10 according to a first embodiment of the present invention.

[0035] In this mounting structure 3 for annular metal seal, the annular metal seal 10 is fitted into annular seal groove 4 of a first member 1 and is pressed and deformed by a second member 2, thereby sealing an inside A and an outside B of the annular metal seal 10. In this embodiment, the configurations of the first member 1 and the second member 2 are not specifically described, but may be, for example, a flange portion at the connection portion of a pair of pipes.

[0036] The annular metal seal 10 of this embodiment has a seal body 10a including, for example, four pointed ridges 11, 12, 13, and 14 on the upper and lower side surfaces. The annular metal seal 10 is made of, for example, stainless steel, nickel alloy, copper, etc. This embodiment is directed to an X-ring having an X-shaped cross section and four ridges 11, 12, 13, and 14, but is not limited to this cross-sectional shape.

[0037] 1, in the mounting structure 3 of the annular metal seal of this embodiment, the positioning ring 20 is sandwiched between the seal body 10a and the outer diameter side surface 10b, the positioning ring 20 is in contact with the inner side surface 4a of the seal groove 4, and the annular metal seal 10 is fitted into the seal groove 4 with the pointed protrusion 11 of the seal body 10a separated from the corner portion (hereinafter also referred to as corner R) of the seal groove 4. In this state, the first member 1 and the second member 2 are fastened together to deform the annular metal seal 10, thereby sealing the inside A and the outside B of the annular metal seal 10.

[0038] Although not shown, the positioning ring 20 may be in contact with the inner side surface 4a of the seal groove 4 with the positioning ring 20 sandwiched between the inner diameter side surface of the seal body 10a.

[0039] Here, the radial thickness W2 of the positioning ring 20 is equal to or greater than the radius r0 of the corner R of the seal groove 4 (W2≧r0). Moreover, the height H2 of the positioning ring 20 is equal to or greater than the depth H0 of the seal groove 4 minus the radius r0 of the corner R of the seal groove 4, and is equal to or less than 0.75 times the height H1 of the annular metal seal 10 (H0-r0≦H2≦0.75H1). These dimensional relationships are desirable for the annular metal seal 10 to function properly.

[0040] In the embodiment, the seal groove 4 has an outer diameter D0 = 17.80 mm, a groove depth H0 = 0.7 mm, and a groove width W0 ≧ 1.5 mm, the annular metal seal 10 has an outer diameter D1 = 17.0 mm, a height H1 = 0.8 mm, and a radial thickness W1 = 0.8 mm, and the positioning ring 20 has an outer diameter D2 = 17.65 mm, a height H2 = 0.6 mm, and a radial thickness W2 = 0.25 mm.

[0041] In this embodiment, the positioning ring 20 having an appropriate dimensional relationship is clamped so that the pointed protrusion 11 of the annular metal seal 10 is reliably spaced apart from the corner R.

[0042] -How to install the annular metal seal- First, the seal body 10a and the positioning ring 20 are prepared as the annular metal seal 10 of this embodiment.

[0043] Next, the positioning ring 20 is abutted against the inner side surface 4a of the seal groove 4, and the annular metal seal 10 is fitted into the seal groove 4 with the pointed protrusion 11 of the seal body 10a separated from the corner R of the seal groove 4.

[0044] Next, the first member 1 and the second member 2 are fastened together to deform the annular metal seal 10, thereby sealing the inside A and the outside B of the annular metal seal 10.

[0045] At this time, in this embodiment, by sandwiching the positioning ring 20, the positioning ring 20 abuts against the inner side surface 4a of the seal groove 4, and a gap S is secured between the outer diameter side surface 10b of the seal body 10a on the side of the pointed ridge 11 and the tip of the pointed ridge 11, so that the pointed ridge 11 does not come into contact with the corner R of the seal groove 4. Therefore, the position of the annular metal seal 10 is stable when tightened, and a reaction force or contact surface pressure is normally generated. In addition, there is no radial slip at the corner R, and no damage is caused in the path direction connecting the areas to be sealed, so no leakage occurs.

[0046] As described above, according to this embodiment, the annular metal seal 10 is reliably clamped between flat surfaces, thereby allowing the annular metal seal 10 to stably exhibit its inherent performance.

[0047] Generally, a backup ring is used to prevent an O-ring or the like from protruding from a groove or getting stuck in a gap, and generally has a height greater than or equal to the depth of the groove, which differs from the positioning ring 20 of this embodiment.

[0048] (Embodiment 2) Fig. 3 shows a second embodiment of the present invention, which differs from the first embodiment in that it does not have a positioning ring 20. In this embodiment, the same parts as those in Figs. 1 and 2 are denoted by the same reference numerals and detailed description thereof will be omitted.

[0049] Specifically, in this embodiment, the annular metal seal 10' itself is characterized in that the positioning ring 20 is not sandwiched, but a protrusion is provided on the annular metal seal 10' side.

[0050] That is, the positioning protrusion 20' protrudes from at least one of the inner diameter side and the outer diameter side of the seal body 10a'. In this embodiment, as shown in Fig. 3, the positioning protrusion 20' protrudes from the outer diameter side surface 10b' of the seal body 10a'.

[0051] The seal body 10a' has an X-shaped cross section, and a positioning projection 20' is provided at the middle in the height direction of an outer diameter side surface 10b' of the seal body 10a'.

[0052] A radial projection amount W3 of this positioning projection 20' is equal to or greater than the radius r0 of the corner R of the seal groove 4 (W3≧R0).

[0053] The height H3 of the positioning protrusion 20' is greater than or equal to the height H1 of the annular metal seal 10 minus twice the radius r0 of the corner R of the seal groove 4 and is less than or equal to 0.75 times the height H1 of the annular metal seal 10 (H1-2r0≦H3≦0.75H1).

[0054] In the mounting structure 3' of the annular metal seal of this embodiment, the annular metal seal 10 is fitted into the seal groove 4 with the positioning projection 20' in contact with the inner side surface 4a of the seal groove 4 and the pointed ridge 11 of the seal body 10a' separated from the corner R of the seal groove 4, and the first member 1 and the second member 2 are fastened to deform the annular metal seal 10, thereby sealing the inside A and the outside B of the annular metal seal 10. A gap S' is provided between the outer diameter side surface 10b' of the positioning projection 20' on the side of the pointed ridge 11 of the seal body 10a' and the tip of the pointed ridge 11 to prevent contact with the corner R of the seal groove 4.

[0055] -How to install the annular metal seal- First, an annular metal seal 10' having a positioning projection 20' protruding from an outer diameter side surface 10b' of a seal body 10a' is prepared.

[0056] Next, the annular metal seal 10 is fitted into the seal groove 4 with the positioning projection 20' abutting against the inner side surface 4a of the seal groove 4 and the pointed ridge 11 of the seal body 10a' being spaced away from the corner R of the seal groove 4. At this time, since the positioning projection 20' abuts against the inner side surface 4a of the seal groove 4 and the radial protrusion amount W3 of the positioning projection 20' is equal to or greater than the radius r0 of the corner R of the seal groove 4, the pointed ridge 11 of the annular metal seal 10' is reliably spaced away from the corner R.

[0057] Next, the first member 1 and the second member 2 are fastened together to deform the annular metal seal 10', thereby sealing the inside A and the outside B of the annular metal seal 10'.

[0058] In this embodiment, the positioning protrusion 20' abuts against the inner side surface 4a of the seal groove 4, and a gap S' is secured between the outer diameter side surface 10b' on the pointed protrusion 11 side of the seal body 10a' and the tip of the pointed protrusion 11, so that the pointed protrusion 11 does not come into contact with the corner R of the seal groove 4.

[0059] Therefore, the position of the annular metal seal 10 is stable when it is fastened, and the reaction force or contact surface pressure is normally generated.

[0060] In addition, there is no radial slippage at the corners R, and no damage is caused in the path direction connecting the areas to be sealed, preventing leakage.

[0061] Therefore, the annular metal seal 10' according to this embodiment can also stably exhibit its inherent performance by reliably clamping the annular metal seal 10' between flat surfaces.

[0062] (Other embodiments) The present invention may be configured as follows with respect to the above embodiment.

[0063] That is, in the above embodiment 1, a positioning ring 20 having an inner diameter larger than the outer diameter D1 of the seal body 10a is provided, but a positioning ring 20 having an outer diameter smaller than the inner diameter of the seal body 10a may also be provided and abutted against the inner side wall of the seal groove 4.

[0064] In the above-mentioned second embodiment, the positioning protrusion 20' is provided on the outer diameter side surface 10b' of the annular metal seal 10', but it may be provided on the inner diameter side surface or on both the outer diameter side and the inner diameter side. When the positioning protrusion 20' is provided on the inner diameter side surface, the corner R on the side closer to the center of the seal groove 4 can be avoided.

[0065] It should be noted that the above-described embodiments are essentially preferred examples, and are not intended to limit the scope of the present invention, its applications, or uses. [Explanation of symbols]

[0066] 1 First member 2 Second member 3,3' Mounting structure 4 Seal groove 4a Medial side 10,10' Circular Metal Seal 10a, 10a' Seal body 10b,10b' Outside diameter side 11,12,13,14 Projections 20 Positioning ring 20' Positioning protrusion 101 First member 101a 1st plane 102 Second member 102a 2nd plane 104 Seal groove 110 Annular metal seal 111~114 Projections

Claims

1. A mounting structure for an annular metal seal in which an inner side and an outer side of the annular metal seal are sealed by being pressed and deformed by a second member while the annular metal seal is fitted into an annular seal groove of a first member, The annular metal seal is a seal body having a protrusion having a sharp edge at least on one of its upper and lower surfaces corresponding to a corner of the seal groove, the seal body having a side surface that is linear in cross section including a side surface of the protrusion, In the seal body, an annular positioning ring is sandwiched between the linear cross-sectional side surface of at least one of the inner diameter side and the outer diameter side, the annular metal seal is fitted into the seal groove in a state in which the positioning ring abuts against an inner side surface of at least a portion of the seal groove and a sharp protrusion of the seal body is spaced away from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal.

2. A mounting structure for an annular metal seal comprising:

2. The radial thickness of the positioning ring is equal to or greater than the radius of the corner of the seal groove.

2. The mounting structure for an annular metal seal according to claim 1.

3. The height of the positioning ring is equal to or greater than the depth of the seal groove minus the radius of the corner of the seal groove and is equal to or less than 0.75 times the height of the annular metal seal.

3. The mounting structure for an annular metal seal according to claim 1 or 2.

4. A method for installing an annular metal seal, in which the annular metal seal is fitted into an annular seal groove of a first member and is pressed and deformed by a second member to seal between an inside and an outside of the annular metal seal, comprising: an annular metal seal including a seal body having a protrusion having a sharp edge on at least one of the upper and lower surfaces corresponding to a corner of the seal groove, the seal body having a linear cross-sectional side including a side surface of the protrusion; preparing a positioning ring having an outer diameter smaller than the inner diameter of the seal body or a positioning ring having an inner diameter larger than the outer diameter of the seal body; the positioning ring is brought into contact with an inner side surface of at least a portion of the seal groove, and is brought into contact with at least one of the side surfaces of the seal body that is linear in cross section on the inner diameter side and the outer diameter side, and the annular metal seal is fitted into the seal groove in a state in which a pointed protrusion of the seal body is separated from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal. A method for installing an annular metal seal comprising:

5. An annular metal seal that is fitted into an annular seal groove of a first member and is deformed by being pressed against the seal groove by a flat surface of a second member so as to cover the seal groove, a seal body having a protrusion having a sharp edge at least on one of its upper and lower surfaces corresponding to a corner of the seal groove, the seal body having a linear cross-sectional side including a side surface of the protrusion; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, the positioning projection protruding from the linear cross-sectional side surface; A gap is provided between the side surface of the positioning projection on the side of the pointed protrusion of the seal body and the tip of the pointed protrusion to prevent contact with a corner portion of the seal groove. Annular metal seal.

6. The positioning protrusion is provided at the height direction midpoint of the cross-sectionally straight side surface on the inner diameter side and the outer diameter side of the seal body.

6. The annular metal seal according to claim 5.

7. 1. A mounting structure for an annular metal seal, in which an annular metal seal is fitted into an annular seal groove of a first member, and a flat surface of a second member is pressed against and deformed so as to cover the seal groove, thereby sealing an inside and an outside of the annular metal seal, The annular metal seal is a seal body having a protrusion having a sharp edge at least on one of its upper and lower surfaces corresponding to a corner of the seal groove, the seal body having a linear cross-sectional side including a side surface of the protrusion; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, the positioning projection protruding from the linear cross-sectional side surface; the annular metal seal is fitted into the seal groove in a state in which the positioning projection abuts against at least a portion of an inner side surface of the seal groove and a sharp protrusion of the seal body is spaced from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal.

2. A mounting structure for an annular metal seal comprising:

8. The radial projection of the positioning projection is equal to or larger than the radius of the corner of the seal groove, so that the sharp protrusion of the seal body is spaced apart from the corner of the seal groove.

8. The mounting structure for an annular metal seal according to claim 7.

9. The height of the positioning projection is equal to or greater than the height of the annular metal seal minus twice the radius of the corner of the seal groove and equal to or less than 0.75 times the height of the annular metal seal, thereby separating the sharp protrusion of the seal body from the corner of the seal groove.

9. The mounting structure for an annular metal seal according to claim 7 or 8.

10. A method for installing an annular metal seal, in which the annular metal seal is fitted into an annular seal groove of a first member, and a flat surface of a second member is pressed against and deformed so as to cover the seal groove, thereby sealing between an inside and an outside of the annular metal seal, comprising: a seal body having a protrusion having a sharp edge at least on one of its upper and lower surfaces corresponding to a corner of the seal groove, the seal body having a side surface that is linear in cross section including a side surface of the protrusion; a positioning projection protruding from at least one of the inner diameter side and the outer diameter side of the seal body, the positioning projection protruding from the linear cross-sectional side surface; preparing an annular metal seal having a gap between a side surface of the positioning projection on the side of the seal body facing the pointed protrusion and a tip of the pointed protrusion; the positioning projection is brought into contact with an inner side surface of at least a portion of the seal groove, and the annular metal seal is fitted into the seal groove in a state in which the pointed protrusion of the seal body is spaced away from a corner portion of the seal groove; The first member and the second member are fastened together to deform the annular metal seal, thereby sealing the inside and outside of the annular metal seal. A method for installing an annular metal seal comprising:

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