TW202421944A - Annular metal seal, installation structure of annular metal seal, and installation method of annular metal seal - Google Patents

Abstract

The invention provides an annular metal seal that is pressed and deformed by a second member while being fitted into an annular seal groove of a first member. The annular metal seal comprises an annular seal body; a pair of upper and lower tapered first protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the outer peripheral corner portions of the seal groove; a pair of upper and lower tapered second protrusions that respectively protrude from the upper and lower surfaces of the seal body and correspond to the inner peripheral corner portions of the seal groove; and a positioning protrusion protruding from at least one side of the outer diameter side and the inner diameter side of the seal body; in which the height of the pair of upper and lower second protrusions from the vertical center is different from the height of the pair of upper and lower first protrusions from the vertical center. According to the present invention, damage to the first member and the second member and load on the tightening bolt are reduced.

Description

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

The present invention relates to an annular metal seal, an installation structure of the annular metal seal and an installation method of the annular metal seal.

At present, a generally annular metal seal 210 is known, such as shown in FIG. 4 (a), which is sandwiched between a pair of parallel flat surfaces 201 and 202. The annular metal seal 210 is composed of a middle base 210a, a first contact protrusion 214 abutting against the upper flat surface 202, and a second contact protrusion 214 abutting against the lower flat surface 201. 211, the first contact protrusion 214 is protruded toward the inner diameter side of the middle base 210a, and the second contact protrusion 211 is protruded toward the outer diameter side of the middle base 210a, and the torsional elastic deformation rotating around the middle base 210a is generated by the pressure received from a pair of flat surfaces 201 and 202 in the installed compressed state (for example, refer to patent document 1). [Prior technical document] [Patent document]

Patent document 1 Japanese Patent No. 4091373

[The problem that the invention wants to solve]

For example, as shown in FIG. 4( b ), after the R-shaped protrusions (the first contact protrusion 214 and the second contact protrusion 211) and the corners 212 and 213 of the annular metal seal 210 asymmetrically arranged on the upper and lower surfaces come into contact with the upper and lower flanges (the flat surfaces 201 and 202 ), the metal material undergoes plastic deformation and generates a reaction force on the upper and lower flanges, thus requiring a very high compressive load. As a result, there is a problem that the damage to the upper and lower flanges increases and the load on the tightening bolts used for tightening increases.

The present invention is completed in view of this point, and its purpose is to reduce the damage to the first component and the second component and the load on the fastening bolt. [Means for solving the problem]

In order to achieve the above object, in the present invention, the shapes of the protrusions on the upper and lower surfaces of the annular metal seal are repeatedly studied.

Specifically, in the first invention, an annular metal seal is taken as the object, and the annular metal seal is deformed by being pressed by a second component while being embedded in an annular sealing groove of a first component. The annular metal seal comprises: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the inner peripheral corners of the sealing groove; and a positioning protrusion, which bulges from the side of at least one of the outer diameter side and the inner diameter side of the sealing body, The height of the upper and lower pairs of second protrusions from the upper and lower centers is different from the height of the upper and lower pairs of first protrusions from the upper and lower centers.

Here, "tapered" means that the tip is tapered compared to the root of the protrusion. With the above structure, the first and second protrusions with tapered tip protruding from the upper and lower surfaces of the annular seal body are deformed in a manner of being compressed from the tip when the annular metal seal is embedded in the annular seal groove of the first component and pressed by the second component. Therefore, compared with protrusions that are not tapered, the load required for deformation is much smaller, reducing damage to the first and second components and the load on the fastening bolts. Since the first and second protrusions on the upper and lower surfaces are deformed to exert sealing performance, leakage between the first and second components can be reliably prevented. In addition, since the positioning protrusion maintains the distance between the inner surface of the sealing groove and the first protrusion or the second protrusion, interference with the R portion of the corner portion of the sealing groove can be prevented, and the sealing performance is stable. In addition, since the height of the upper and lower pairs of second protrusions from the upper and lower centers is different from the height of the upper and lower pairs of first protrusions from the upper and lower centers, when the protrusions of the lower height come into contact with the outside during dropping or handling, the protrusions of the lower height are not easily damaged. Even if the protrusions of the higher height are damaged, the sealing performance can be ensured by the upper and lower protrusions of the lower height.

In the second invention, based on the first invention, the positioning protrusion bulges out from the side surface of the outer diameter side of the sealing body, and the height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers.

With the above structure, the distance between the inner surface of the sealing groove and the first protrusion is maintained by the positioning protrusion, and interference with the R portion of the corner of the sealing groove is prevented, and the sealing performance is stable. In addition, since the height of the second protrusion on the inner diameter side is lower than the first protrusion on the outer diameter side, the second protrusion is not easily damaged when it comes into contact with the outside during falling or handling. Even if the first protrusion is damaged, the sealing performance can be ensured by the upper and lower second protrusions.

The third invention is a mounting structure for an annular metal seal, which is a mounting structure for an annular metal seal that seals the inner and outer sides of the annular metal seal by deforming the annular metal seal when the annular metal seal is pressed by the second component while being embedded in the annular sealing groove of the first component, wherein, the annular metal seal comprises: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the inner peripheral corners of the sealing groove; and A positioning protrusion bulges out from the side surface of at least one of the outer diameter side and the inner diameter side of the seal body, The height of the upper and lower pairs of second protrusions from the upper and lower centers is different from the height of the upper and lower pairs of first protrusions from the upper and lower centers, The annular metal seal is deformed by tightening the first component and the second component, and the inner and outer sides of the annular metal seal are sealed.

With the above structure, the first and second protrusions with tapered front ends protruding from the upper and lower surfaces of the annular seal body are deformed in a manner of being compressed from the front end when the annular metal seal is embedded in the annular seal groove of the first component and pressed by the second component. Therefore, compared with protrusions that are not tapered at the front end, the load required for deformation is much smaller, which reduces damage to the first and second components and the load on the fastening bolts. Since the first and second protrusions on the upper and lower surfaces are deformed to exert sealing performance, leakage between the first and second components can be reliably prevented. In addition, since the positioning protrusion maintains the distance between the inner surface of the seal groove and the first or second protrusion, interference with the R portion of the corner portion of the seal groove can be prevented, and the sealing performance is stable. In addition, since the height of the upper and lower pair of second protrusions from the upper and lower centers is different from the height of the upper and lower pair of first protrusions from the upper and lower centers, the protrusion on the lower side is not easily damaged when it comes into contact with the outside when dropped or handled. Even if the protrusion on the higher side is damaged, the upper and lower protrusions on the lower side can be used to ensure sealing performance.

In the fourth invention, based on the third invention, the positioning protrusion bulges out from the side surface of the outer diameter side of the sealing body, and the height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers.

With the above structure, the distance between the inner surface of the sealing groove and the first protrusion is maintained by the positioning protrusion, and interference with the R portion of the corner of the sealing groove is prevented, and the sealing performance is stable. In addition, since the height of the second protrusion on the inner diameter side is lower than the height of the first protrusion on the outer diameter side, the second protrusion is not easily damaged when it comes into contact with the outside during falling or handling. Even if the first protrusion is damaged, the sealing performance can be ensured by the upper and lower second protrusions.

The fifth invention is a method for installing an annular metal seal, a method for installing an annular metal seal in which the inner and outer sides of the annular metal seal are sealed by the annular metal seal being pressed and deformed by the second component while the annular metal seal is embedded in the annular sealing groove of the first component, wherein, the annular metal seal comprises: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the inner peripheral corners of the sealing groove; and A positioning protrusion bulges out from the side surface of at least one of the outer diameter side and the inner diameter side of the aforementioned seal body, The aforementioned positioning protrusion bulges out from the side surface of the outer diameter side of the aforementioned seal body, The height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers, The installation method of the aforementioned annular metal seal comprises the following steps: Preparing the aforementioned annular metal seal; Making the aforementioned positioning protrusion abut against the outer side surface of the aforementioned sealing groove, and embedding the aforementioned annular metal seal into the aforementioned sealing groove in a state where the first protrusion on the lower surface of the aforementioned seal body is away from the outer peripheral corner of the aforementioned sealing groove; and The aforementioned first component and the aforementioned second component are tightened to deform the aforementioned annular metal seal, thereby sealing the inner and outer sides of the annular metal seal.

With the above structure, the first and second protrusions with tapered front ends protruding from the upper and lower surfaces of the annular seal body are deformed in a manner of being compressed from the front end when the annular metal seal is embedded in the annular seal groove of the first component and pressed by the second component. Therefore, compared with protrusions that are not tapered at the front end, the load required for deformation is much smaller, reducing damage to the first and second components and the load on the fastening bolts. Since the first and second protrusions on the upper and lower surfaces are deformed to exert sealing performance, leakage between the first and second components can be reliably prevented. In addition, the distance between the inner surface of the seal groove and the first protrusion is maintained by the positioning protrusion, preventing interference with the R portion of the corner portion of the seal groove, and the sealing performance is stable. In addition, since the height of the second protrusion on the inner diameter side is lower than the height of the first protrusion on the outer diameter side, the second protrusion is not easily damaged when it comes into contact with the outside during dropping or handling. Even if the first protrusion is damaged, the upper and lower second protrusions can ensure sealing performance. [Effect of the invention]

As described above, according to the present invention, damage to the first member and the second member and load on the fastening bolts can be reduced.

Below, the implementation mode of the present invention is described based on the accompanying drawings.

FIG. 1 shows an annular metal seal mounting structure 3 including an annular metal seal 10 according to an embodiment of the present invention.

In the mounting structure 3 of the annular metal seal, the annular metal seal 10 is pressed and deformed by the second member 2 while being inserted into the annular seal groove 4 of the first member 1, so that the inner side A and the outer side B of the annular metal seal 10 are sealed. In the present embodiment, the structure of the first member 1 and the second member 2 is not specifically described, but the first member 1 and the second member 2 are, for example, annular flange portions at the connection portion of a pair of pipes, and a fastening bolt (not shown) is inserted through the first bolt insertion hole 1a of the first member 1 and the second bolt insertion hole 2a of the second member 2 and a nut is tightened.

As shown in the enlarged view of FIG. 2 , the annular metal seal 10 of the present embodiment has, for example, a seal body 10a, on the upper and lower surfaces of the seal body 10a, first protrusions 11, 12 and second protrusions 13, 14 that gradually taper toward the front end protrude, respectively. The annular metal seal 10 is made of, for example, stainless steel, nickel alloy, copper, or the like.

Specifically, the annular metal seal 10 includes an annular seal body 10a, a pair of first protrusions 11 and 12 protruding from the upper and lower surfaces of the seal body 10a and corresponding to the outer peripheral corner R1 of the seal groove 4, and a pair of second protrusions 13 and 14 protruding from the upper and lower surfaces of the seal body 10a and corresponding to the inner peripheral corner R2 of the seal groove 4. Here, "tapered" means that the tip of the protrusion becomes thinner than the base.

Moreover, the height of the upper and lower pair of second protrusions 13 and 14 from the upper and lower center C is different from the height of the upper and lower pair of first protrusions 11 and 12 from the upper and lower center C. In the present embodiment, in particular, the height of the upper and lower pair of second protrusions 13 and 14 from the upper and lower center C is lower than the height of the upper and lower pair of first protrusions 11 and 12 from the upper and lower center C by h. In the present embodiment, for example, the height of the upper and lower pair of first protrusions 11 and 12 from the upper and lower center C is 0.400 mm, and the height of the upper and lower pair of second protrusions 13 and 14 from the upper and lower center C is 0.375 mm, and h=0.025 mm.

Furthermore, in the annular metal seal mounting structure 3 of the present embodiment, as shown in FIG. 1 , the positioning protrusion 20 bulges out on the outer diameter side surface 10 b of the annular metal seal 10 .

Thus, the seal body 10a is roughly X-shaped in cross section, and the positioning protrusion 20 is provided at the middle of the outer diameter side surface 10b of the seal body 10a in the height direction. The height of the positioning protrusion 20 from the upper and lower center C is, for example, 0.3 mm, the width W from the front end of the first protrusion 11 to the outer diameter side surface 10b of the positioning protrusion 20 is, for example, 0.20 mm, and the radius r0 of the outer diameter side corner R1 is 0.1 mm, so W>r0.

In the mounting structure 3 of the annular metal seal of the present embodiment, the positioning protrusion 20 abuts against the inner side surface 4a of the sealing groove 4, and the annular metal seal 10 is embedded in the sealing groove 4 in a state where the first protrusion 11 at the front end of the sealing body 10a is tapered away from the outer diameter side corner R1 of the sealing groove 4, and the first component 1 and the second component 2 are tightened to deform the annular metal seal 10, thereby sealing the inner side A and the outer side B of the annular metal seal 10.

Furthermore, a gap S is provided between the inner side surface 4a of the seal groove 4 and the front end of the pointed protrusion 11 to prevent contact with the outer diameter corner R1 of the seal groove 4. In the present embodiment, the gap S is maintained at 0.2 mm or more (S>r0).

- Installation method of annular metal seal - First, prepare the annular metal seal 10 mentioned above.

Next, as shown in FIG. 1 , the positioning protrusion 20 is brought into contact with the inner side surface 4a of the seal groove 4, and the annular metal seal 10 is inserted into the seal groove 4 in a state where the first protrusion 11 of the seal body 10a is away from the outer diameter corner R1 of the seal groove 4. At this time, the positioning protrusion 20 is brought into contact with the inner side surface 4a of the seal groove 4, and the radial projection amount W of the positioning protrusion 20 is greater than or equal to the radius r0 of the outer diameter corner R1 of the seal groove 4 (W ≥ r0), so the first protrusion 11 of the annular metal seal 10 is reliably spaced apart from the outer diameter corner R1.

Next, the first member 1 and the second member 2 are tightened by tightening bolts or the like to deform the annular metal seal 10, thereby sealing the inner side A and the outer side B of the annular metal seal 10.

At this time, since the first protrusions 11, 12 and the second protrusions 13, 14 on the upper and lower surfaces are both deformed to exert sealing performance, leakage between the first component 1 and the second component 2 can be reliably prevented.

- Implementation example - FEM (finite element method) analysis is performed on the load applied when the first component 1 and the second component 2 are tightened. The analysis model is set as a two-dimensional axisymmetric analysis, and the material is set as stainless steel and other metal materials with similar mechanical properties. As for the analysis method, the model corresponding to the annular metal seal 210 of the shape shown in Figure 4 is set as a comparative example, and the model of the annular metal seal 10 of the above-mentioned implementation method is set as an implementation example. Then, a pair of upper and lower compression plates corresponding to the first component 1 and the second component 2 are respectively arranged on the upper and lower surfaces of these models.

Then, the interval between the upper and lower compression plates is reduced (set height), so that the annular metal seals of the models corresponding to the annular metal seal 210 of the comparative example and the annular metal seal 10 of the embodiment are deformed respectively. Specifically, for the comparative example and the embodiment, the annular metal seals are compressed from the initial height to the set height of 0.70 mm.

The load characteristics shown in FIG3 are obtained by plotting the correlation between the reaction force generated on the upper and lower compression plates and the setting height.

As shown in FIG4 (b), the annular metal seal 210 of the comparative example, after the R-shaped protrusions (first contact convex portion 214 and second contact convex portion 211) and corner portions 212, 213 asymmetrically arranged on the upper and lower surfaces contact the upper and lower flanges (flat surfaces 201, 202), the metal material is plastically deformed, and a reaction force on the upper and lower flanges is generated at the same time. Therefore, the annular metal seal 210 of the comparative example is tilted and its front end is greatly deformed, as shown in FIG3, requiring a very high compressive load. Therefore, the damage to the upper and lower flanges increases, and the load on the fastening bolts used for fastening increases.

On the other hand, as shown in FIG5(b), in the model of the embodiment, instead of being greatly inclined like the comparative example, only the front end sides of the first ridges 11, 12 and the second ridges 13, 14 where the front ends are tapered are compressed. Therefore, as shown by the solid line in FIG3, a load characteristic with a smaller slope than that of the comparative example can be obtained. That is, the compressive load at the same installation height is greatly reduced.

On the other hand, as a previous example without the positioning protrusion 20 shown in Figure 7, consider an annular metal seal mounting structure 103 having the following annular metal seal 110, which is clamped between the first plane 101a of the first component 101 and the second plane 102a of the second component 102, and is pressed by bringing the first plane 101a and the second plane 102a close to each other.

Here, the annular metal seal 110 without the positioning protrusion 20 is inserted into the seal groove 104 dug out on the first member 101 for use, and one of the sharp protrusions 111 to 114 of the annular metal seal 110 abuts against the outer diameter corner R1 of the seal groove 104. When the seal groove 104 is machined, the outer diameter corner R1 of the seal groove 104 is usually an inevitable shape. Therefore, the following problem may occur.

(1) The position of the annular metal seal 110 is not stable during tightening and cannot generate a reaction force or contact surface pressure normally.

(2) The outer diameter side corner R1 slides in the radial direction, causing damage in the path direction of the connection area to be sealed, resulting in leakage.

However, in the annular metal seal 10 of the present embodiment, as shown in FIG1 , the positioning protrusion 20 maintains a gap S between the inner side surface 4a of the seal groove 4 and the first ridge 11, thereby preventing interference with the outer diameter corner R1 of the seal groove 4. Therefore, the position of the annular metal seal 10 is stable during tightening, and the reaction force or contact surface pressure is normally generated. In addition, there is no radial sliding at the outer diameter corner R1, no damage in the path direction connecting the area to be sealed, no leakage occurs, and the sealing performance is stable.

As described above, in the present embodiment, the first protrusions 11, 12 and the second protrusions 13, 14 with tapered front ends protruding from the upper and lower surfaces of the annular seal main body 10a are deformed in a manner of being compressed from the front end when the annular metal seal 10 is embedded in the annular seal groove 4 of the first component 1 and is pressed by the second component 2. Therefore, compared with the R-shaped protrusions of the comparison example without tapered front ends as shown in FIG. 4, the load required for deformation is very small, thereby reducing damage to the first component 1 and the second component 2 and the load on the fastening bolts.

In addition, since the height of the second protrusions 13 and 14 on the inner diameter side is lower than the height of the first protrusions 11 and 12 on the outer diameter side, when the second protrusions 13 and 14 on the inner diameter side come into contact with the outside during dropping or handling, the second protrusions 13 and 14 on the inner diameter side with a lower height are not easily damaged. Even if the first protrusions 11 and 12 are damaged, the upper and lower second protrusions 13 and 14 can be used to ensure sealing performance.

As described above, according to this embodiment, damage to the first component 1 and the second component 2 and the load on the fastening bolts can be reduced.

(Other implementations) In the present invention, the above-mentioned implementations may also be structured as follows.

That is, in the above-mentioned embodiment, the positioning protrusion 20 bulges on the outer diameter side surface 10b of the seal body 10a, but the positioning protrusion 20' may be bulged on the inner side surface of the inner diameter side of the seal body 10a' as in the annular metal seal 10' shown in Fig. 6. In this case, in order to prevent damage when falling, etc., it is ideal that the height of the second protrusions 13' and 14' on the inner diameter side from the upper and lower center C is lower than the height of the first protrusions 11' and 12' on the outer diameter side from the upper and lower center C. In addition, the positioning protrusion may of course bulge on both the outer diameter side and the inner diameter side.

In the above-mentioned embodiment, the height of the upper and lower second protrusions 13 and 14 on the inner diameter side from the upper and lower center C is made lower than the height of the upper and lower first protrusions 11 and 12 on the outer diameter side from the upper and lower center C, but the height of the upper and lower second protrusions 13 and 14 on the inner diameter side from the upper and lower center C may be higher than the height of the upper and lower first protrusions 11 and 12 on the outer diameter side from the upper and lower center C. In this case, when the protrusions on the side with a lower height come into contact with the outside during dropping or handling, the protrusions on the side with a lower height are less likely to be damaged, and even if the protrusions on the side with a higher height are damaged, the sealing performance can be ensured by the upper and lower protrusions on the side with a lower height. However, the design of lowering the height of the upper and lower pairs of second protrusions 13 and 14 on the inner diameter side to more easily avoid contact with the outside from the upper and lower center C can more reliably prevent damage and ensure the sealing performance based on at least the upper and lower pairs of second protrusions 13 and 14, so it is advantageous.

In addition, the above embodiments are merely preferred examples in nature and are not intended to limit the scope of the invention, its applications or uses.

1: First component 1a: First bolt insertion hole 2a: Second bolt insertion hole 2: Second component 3: Mounting structure 4: Seal groove 4a: Inner side surface 10: Annular metal seal 10a: Seal body 10b: Outer diameter side surface 11, 12: First protrusion 13, 14: Second protrusion 20: Positioning protrusion 101: First component 101a: First plane 102: Second component 102a: Second plane 103: Mounting structure 104: Seal groove 110: Annular metal seal 111-114: Protrusions 201, 202: Flat surface 210: Annular metal seal 211: Second contact convex part 212, 213: Corner part 214: First contact convex part

FIG. 1 is a cross-sectional view showing an annular metal seal mounting structure including an annular metal seal of an embodiment. FIG. 2 is an enlarged cross-sectional view showing an annular metal seal. FIG. 3 is a coordinate diagram showing load characteristics of an embodiment and a comparative example. FIG. 4 is a diagram showing the results of analyzing the compression behavior of the annular metal seal of the comparative example, (a) showing before compression, and (b) showing during compression. FIG. 5 is a diagram showing the results of analyzing the compression behavior of the annular metal seal of the embodiment, (a) showing before compression, and (b) showing during compression. FIG. 6 is a diagram equivalent to FIG. 2 of an annular metal seal of another embodiment. FIG. 7 is a cross-sectional view showing the mounting structure of the annular metal seal including the annular metal seal of the prior art.

1: First part

1a: First bolt insertion hole

2a: Second bolt insertion hole

2: Second part

3: Installation structure

4: Sealing groove

4a: medial side

10: Ring metal seal

10a: Seal body

10b: lateral surface of outer diameter

11, 12: First protrusion

13, 14: Second protrusion

20: Positioning protrusion

Claims (5)

An annular metal seal is deformed by being pressed by a second component while being embedded in an annular sealing groove of a first component, and is characterized in that it has: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the inner peripheral corners of the sealing groove; and a positioning protrusion, which bulges from the side of at least one of the outer diameter side and the inner diameter side of the sealing body, the height of the second protrusions from the upper and lower centers is different from the height of the first protrusions from the upper and lower centers. The annular metal seal of claim 1, wherein the positioning protrusion bulges out from the side of the outer diameter side of the seal body, and the height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers. A mounting structure for an annular metal seal, wherein the annular metal seal is deformed by being pressed by a second component while being embedded in an annular sealing groove of a first component, thereby sealing the inner and outer sides of the annular metal seal, wherein the annular metal seal comprises: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body and correspond to the inner peripheral corners of the sealing groove; and A positioning protrusion bulges out from the side surface of at least one of the outer diameter side and the inner diameter side of the seal body, The height of the upper and lower pairs of second protrusions from the upper and lower centers is different from the height of the upper and lower pairs of first protrusions from the upper and lower centers, The annular metal seal is deformed by tightening the first component and the second component, and the inner and outer sides of the annular metal seal are sealed. The mounting structure of the annular metal seal of claim 3, wherein the positioning protrusion bulges out from the side of the outer diameter side of the seal body, and the height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers. A method for installing an annular metal seal, wherein the annular metal seal is deformed by being pressed by a second component while being embedded in an annular sealing groove of a first component, thereby sealing the inner and outer sides of the annular metal seal, wherein the annular metal seal comprises: an annular sealing body; a pair of first protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the outer peripheral corners of the sealing groove; a pair of second protrusions with tapered front ends, which protrude from the upper and lower surfaces of the sealing body, respectively, and correspond to the inner peripheral corners of the sealing groove; and A positioning protrusion bulges out from the side surface of at least one of the outer diameter side and the inner diameter side of the aforementioned seal body, The aforementioned positioning protrusion bulges out from the side surface of the outer diameter side of the aforementioned seal body, The height of the upper and lower pairs of second protrusions from the upper and lower centers is lower than the height of the upper and lower pairs of first protrusions from the upper and lower centers, The installation method of the aforementioned annular metal seal comprises the following steps: Preparing the aforementioned annular metal seal; Making the aforementioned positioning protrusion abut against the outer side surface of the aforementioned sealing groove, and embedding the aforementioned annular metal seal into the aforementioned sealing groove in a state where the first protrusion on the lower surface of the aforementioned seal body is away from the outer peripheral corner of the aforementioned sealing groove; and The aforementioned first component and the aforementioned second component are tightened to deform the aforementioned annular metal seal, thereby sealing the inner and outer sides of the annular metal seal.