JP2020063753A - Seal ring - Google Patents

Abstract

To provide a seal ring with a small set load.SOLUTION: A metal seal ring 1 which is pressed between two cylinder members 2 and 3 to seal a gap between the cylinder members 2 and 3, comprises two plate members 10 and 11 forming an annular shape. Radial ends 10a, 11a of the plate members 10, 11 are hermetically connected to each other, and the other ends 10b and 11b are configured to be separated from each other in an axial direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a metal seal ring.

  In the field of sealing a sealed fluid in a closed space, a housing for containing the sealed fluid is composed of a plurality of tubular members, and a gap between two connected tubular members is sealed in a circumferential direction. As a material, a seal ring that is narrowed between tubular members is generally used.

  In particular, a metal seal ring having excellent heat resistance, cold resistance, and pressure resistance is used in an environment such as high temperature, low temperature, and high pressure where a seal ring such as a rubber packing cannot be used. For example, the metal seal ring disclosed in Patent Document 1 is formed into a C-shape in cross section by punching out a metal plate having a predetermined plate thickness in an annular shape and pressing the metal plate. This seal ring bends and compresses in a direction in which the radial ends approach each other when the axial pressure is narrowed between the tubular members, so that the gap between the tubular members extends in the circumferential direction. It is designed to be sealed.

Japanese Patent Laid-Open No. 2001-12609 (page 3, FIG. 2)

  However, in the conventional seal ring as in Patent Document 1, one metal plate is bent by press working to be formed into a C-shape in cross section, and the seal ring is formed between the cylindrical members. When the axial pressure is narrowed with, the force is applied in the direction to bend the seal ring so as to further crush it, so the repulsive force of the seal ring is large and the set load of the seal ring is large. .

  The present invention has been made in view of these problems, and an object thereof is to provide a seal ring with a small set load.

In order to solve the above problems, the seal ring of the present invention,
A metal seal ring which is pressed between two tubular members to seal a gap between the tubular members,
It is characterized in that it is provided with two plate members that form an annular shape, and one end in the radial direction of the plate members is joined in a sealed manner, and the other ends are axially separated from each other.
According to this feature, the two plate members can be bent separately with the joint between the one ends of the plate members and the vicinity thereof as bending points, so that when the seal ring is narrowed in the axial direction between the tubular members. It is possible to provide a seal ring having a small repulsive force and a small set load.

Preferably, the plate members are joined in a state where one ends of the plate members are in surface contact with each other.
According to this, since one ends of the plate members are in surface contact with each other, it is easy to bend the plate member.

Preferably, one ends of the plate members are caulked.
According to this, one end of the plate member can be easily fixed to each other.

Preferably, the one plate member is formed to be longer in the radial direction than the other plate member, and one end of the one plate member is bent to one end side of the other plate member and caulked and coupled. There is.
According to this, caulking can be easily performed using the plate member.

Preferably, at least the caulking portions between the ends of the plate member are plated.
According to this, the sealing property of the caulking portion can be improved.

Suitably, the other end side of the said plate member is formed with the annular convex part which protrudes in an axial direction outer side.
According to this, the sealability is improved by the annular convex portion coming into contact with the tubular member.

Preferably, the outer diameter side ends of the plate member are hermetically joined to each other, and the inner diameter side ends of the plate member are configured to be axially separated from each other.
According to this, the inner diameter side end portions of the plate member expand in the axial direction under the pressure of the sealed fluid housed inside the tubular member, so that the sealing performance is improved.

Preferably, the inner diameter side ends of the plate member are hermetically joined to each other, and the outer diameter side ends of the plate member are axially separated from each other.
According to this, the outer diameter side end portions of the plate member expand in the axial direction under the pressure of the sealed fluid housed outside the tubular member, so that the sealing performance is improved.

FIG. 3 is a cross-sectional view showing a state in which the seal ring according to the first embodiment of the present invention is installed between housings. 5 is a cross-sectional view showing the structure of the seal ring in Example 1. FIG. (A)-(c) is an important section sectional view showing a process until a seal ring is installed between housings. It is a principal part expanded sectional view which shows the state of the seal ring installed between the housings. It is sectional drawing which shows the structure of the seal ring in Example 2 of this invention. It is sectional drawing which shows the modification of a fastening member.

  Modes for carrying out the seal ring according to the present invention will be described below based on Examples.

  The seal ring according to the first embodiment will be described with reference to FIGS. 1 to 6.

  As shown in FIG. 1, the seal ring 1 of the embodiment of the present invention is sandwiched between the housings 2 and 3 as cylindrical members, and seals the gap between the housings 2 and 3. The seal ring 1 is a metal seal ring that can be used even in environments such as high temperature, low temperature, and high pressure where rubber packing or the like cannot be used. For example, the seal ring 1 is used when sealing a gap between a bearing housing and a compressor housing in a turbocharger of an automobile under a high temperature and high pressure environment.

  The housings 2 and 3 have a tubular shape, and the sealed fluid F whose temperature and pressure are higher than the pressure of the outside is contained inside. In the housings 2 and 3, flange portions 2a and 3a extending in the radial direction are formed so as to face each other in the axial direction, and the flange portions 2a and 3a are fastened by bolts 4 and nuts 5 at a plurality of positions in the circumferential direction. There is.

  Further, an annular recess 2b that is recessed in the outer radial direction and the axial direction is formed at the edge of the opening on the housing 3 side and the inner diameter side in the housing 2. A cylindrical convex portion 3b that can be inserted into the concave portion 2b is formed at an edge portion of the opening portion of the housing 3 on the housing 2 side and the inner diameter side. By inserting the convex portion 3b into the concave portion 2b, the housing is formed. 2 and 3 are centered. Further, the flange portion 3a of the housing 3 is formed with an annular recess 3c that is recessed in the axial direction, and the seal ring 1 is arranged in the annular recess 3c.

  As shown in FIG. 2, the seal ring 1 is composed of two metal plates 10 and 11 which are annular plate members. The metal plates 10 and 11 of this embodiment are made of stainless steel. The metal plates 10 and 11 may be made of any material, but may be made of a metal containing copper, iron, nickel or the like as a main component or an alloy thereof.

  The metal plates 10 and 11 have outer diameter side end portions 10a and 11a, which are one end in the radial direction, joined to each other in a sealed manner over the circumferential direction. That is, the outer diameter side end portions 10a and 11a are joint portions of the seal ring 1. Specifically, the metal plate 10 is formed to extend longer than the metal plate 11 on the outer diameter side, and the metal plates 10 and 11 are arranged in a state in which the outer diameter side end portions 10a and 11a are stacked in the axial direction. The outer diameter side end portion 10a is bent to the outer diameter side end portion 11a side to be caulked. Further, the axial facing surfaces 10d, 11d of the outer diameter side end portions 10a, 11a are in surface contact with each other in the circumferential direction.

  As described above, since the outer diameter side end portions 10a and 11a of the metal plates 10 and 11 are caulked, the metal plates 10 and 11 are simpler than welded fixing which does not receive high heat at the time of joining and requires work such as deburring. Can be fixed. Further, since the metal plates 10 and 11 can be caulked by utilizing the outer diameter side end portion 10a of the metal plate 10, a separate member is not required for caulking, and the metal plates 10 and 11 can be simply and inexpensively mounted. Can be caulked. In addition, hereinafter, a portion where the outer diameter side end portions 10a and 11a are caulked and joined together may be referred to as a caulked portion 1A of the seal ring 1.

  In addition, the metal plates 10 and 11 extend from the outer diameter side to the inner diameter side. , The inner diameter side end portions 10b and 11b which are the other ends in the radial direction and which are connected to the annular convex portions 10c and 11c. Further, in the metal plates 10 and 11, the intermediate portions 10e and 11e on the inner diameter side of the caulking portion 1A, the annular convex portions 10c and 11c, and the inner diameter side end portions 10b and 11b are respectively directed toward the inner diameter direction. It is bent so as to open in the axial direction. That is, the metal plates 10 and 11 are formed in a V-shaped cross-sectional view that expands in the axial direction toward the inner diameter direction with the end portion on the inner diameter side of the crimped portion 1A as the bending point P3. The apex angle of the V-shape in cross section is 40 °, but the angle is not limited, but 20 ° to 60 ° is preferable because the set load can be reduced and the sealing performance can be secured.

  Further, between the inner diameter side ends 10b, 11b and the intermediate portions 10e, 11e of the metal plates 10, 11, annular convex portions 10c, 11c having a curved surface shape in a sectional view projecting outward in the axial direction are circumferentially formed by pressing. The inner diameter side end portions 10b and 11b are formed so as to extend inward in the axial direction from the tops of the annular protrusions 10c and 11c. In addition, it is preferable that the annular convex portions 10c and 11c are previously formed by press working before caulking the outer diameter side end portions 10a and 11a of the metal plates 10 and 11 for convenience of manufacturing. Since the inner diameter side ends 10b and 11b, the intermediate portions 10e and 11e, and the outer diameter side ends 10a and 11a are linear in cross section, the molding accuracy is excellent.

  Further, the outer surface of the seal ring 1 is plated, and a plated layer 12 is formed across the metal plates 10 and 11. Since the plating layer 12 entirely covers the outer surface of the caulking portion 1A, the sealing property of the caulking portion 1A is improved.

  Next, an installation mode of the seal ring 1 will be described based on FIGS. 3 and 4. First, as shown in FIG. 3 (A), the seal ring 1 is arranged in the annular recess 3c of the housing 3, and the protrusion 3b of the housing 3 is inserted into the recess 2b of the housing 2 so that the flanges of the housings 2 and 3 are inserted. A bolt 4 and a nut 5 are attached to the parts 2a and 3a.

  When the housings 2 and 3 are brought close to each other in the axial direction, the flange portions 2a and 3a come into contact with the seal ring 1 in the natural state, that is, the non-compressed state. Specifically, the end surface 2c of the flange portion 2a on the flange portion 3a side contacts the annular convex portion 10c of the metal plate 10, and the bottom surface 3e of the annular concave portion 3c contacts the annular convex portion 11c of the metal plate 11. Thus, when the seal ring 1 is in the non-compressed state and the flange portions 2a and 3a contact the seal ring 1, the end surface 2c of the flange portion 2a and the end surface 3d of the flange portion 3a on the side of the flange portion 2a are opposed to each other. And are not in contact. That is, the axial thickness dimension L1 of the seal ring 1 in the uncompressed state is larger than the axial depth dimension L2 of the annular recess 3c of the housing 3 (L1> L2).

  Next, as shown in FIG. 3B, when the bolt 4 and the nut 5 are tightened, the housings 2 and 3 approach in the axial direction, and the seal ring 1 is pinched by the housings 2 and 3, so that the seal Ring 1 is compressed. In other words, the elastic restoring force of the seal ring 1 acts on the housings 2 and 3 in a direction in which they are separated from each other in the axial direction.

  More specifically, as shown in FIG. 4, when a force (white thick arrow) that compresses the entire seal ring 1 in the axial direction acts, the annular protrusions 10c and 11c function as action points P1 and P2. Receiving a pressing force from the housings 2 and 3, the boundary between the inner diameter side of the caulked portion 1A, which is the joint portion of the metal plates 10 and 11, and the outer diameter side of the intermediate portions 10e and 11e is set as the bending point P3. 11 are bent and deformed separately and come close to each other in the axial direction.

  As shown in FIG. 3 (C), when the bolt 4 and the nut 5 are further tightened, the housings 2 and 3 come closer to each other in the axial direction while further compressing the seal ring 1, and the end surface 2c of the flange portion 2a and the flange 2a. The end surface 3d of the portion 3a is pressed into contact, and the installation of the seal ring 1 between the housings 2 and 3 is completed. When the seal ring 1 is set, the axial thickness dimension L1 of the seal ring 1 is equal to the axial depth dimension L2 of the annular recess 3c of the housing 3 (L1 = L2).

  Returning to FIG. 4, when the seal ring 1 is installed between the housings 2 and 3, the elastic protrusions (black thick arrows) of the seal ring 1 cause the annular protrusions 10c and 11c to move toward the end surface of the flange 2a. Since 2c and the bottom surface 3e of the annular recess 3c are pressed against each other, the gap between the housings 2 and 3 is sealed. Further, the pressure (black thin arrow) acts in the direction of expanding the metal plates 10 and 11 in response to the pressure of the sealed fluid F contained in the housings 2 and 3, so that the sealing performance of the seal ring 1 is improved. To do.

  As described above, the seal ring 1 according to the embodiment of the present invention is configured by sealingly joining the outer diameter side end portions 10a and 11a of the two metal plates 10 and 11 forming the annular shape. Therefore, the metal plates 10 and 11 can be bent separately with the inner diameter side of the caulking portion 1A, which is the joining portion, as the bending point P3. That is, when the seal ring 1 is pressed in the axial direction between the housings 2 and 3, the metal plate 10 is different from the seal ring configured to have a C-shape in cross section by pressing one metal plate. Since the elastic restoring forces of 11 and 11 are small, the set load can be reduced.

  Furthermore, for example, when the seal ring is formed into a C-shape in cross section by pressing one metal plate, the radial length cannot be increased due to the structural strength, but the seal of the present embodiment is used. Since the ring 1 joins the outer diameter side end portions 10a and 11a of the two metal plates 10 and 11 to each other, a large radial length can be secured regardless of the structural strength. That is, since the distance from the bending point P3 to the action points P1 and P2 can be secured long, the metal plates 10 and 11 can be bent with a small force.

  As described above, since the seal ring 1 can be compressed with a small force, high structural strength of the housings 2, 3 and the bolts 4 and nuts 5 that can withstand the elastic restoring force of the seal ring 1 is not required. That is, the housings 2, 3 and the bolts 4, nuts 5, etc. can be reduced in size.

  Further, since the seal ring 1 is largely compressed with a small force, the dimensional tolerance of the depth of the annular recess 3c in which the seal ring 1 is installed can be made large, so that the housings 2 and 3 can be easily manufactured. You can

  Further, since the radial lengths of the metal plates 10 and 11 are secured to be large, the pressure of the sealed fluid F can be received by the large pressure receiving surface, and the metal plates 10 and 11 can be spread with a strong force. The sealing performance of the seal ring 1 is high.

  The facing surfaces 10d and 11d of the outer diameter side end portions 10a and 11a of the metal plates 10 and 11 are in surface contact with each other. Specifically, the seal ring 1 has the inner diameter side end portions 10b and 11b in a state where the facing surfaces 10d and 11d of the outer diameter side end portions 10a and 11a of the flat metal plates 10 and 11 are brought into surface contact with each other. Since it is bent from the bending point P3 so as to be separated in the axial direction, the metal plates 10 and 11 are bent from the bending point P3 when the seal ring 1 is narrowed in the axial direction between the housings 2 and 3. Cheap. Moreover, since the outer diameter side end portions 10a and 11a of the metal plates 10 and 11 can be joined in a wide range, the joining strength is high.

  Further, in the seal ring 1, since the annular convex portions 10c and 11c having a curved surface in cross section come into contact with the housings 2 and 3, the pressure is concentrated as compared with the case where the inner diameter side end portions 10b and 11b come into surface contact with the housings 2 and 3. In addition to improving the sealing performance, the edge portions of the inner diameter side ends 10b and 11b do not come into contact with the housings 2 and 3, and the housings 2 and 3 can be prevented from being damaged.

  Further, since the annular convex portions 10c and 11c are formed by press working, it is not necessary to form the annular convex portions 10c and 11c by another member, and the annular convex portions 10c and 11c can be easily formed. The annular convex portions 10c and 11c may be configured by fixing another annular member to the metal plates 10 and 11.

  A plating layer 12 is formed on the outer surface of the seal ring 1 by plating. That is, since the plating layer 12 entirely covers the outer surface of the caulking portion 1A, the sealing property of the caulking portion 1A is improved, and the outer surface of the annular convex portions 10c and 11c is also covered. It is possible to improve the familiarity with the housings 2 and 3, and the sealing performance of the seal ring 1 is improved.

  In the present embodiment, the outer diameter side end portions 10a and 11a of the metal plates 10 and 11 are exemplified to be caulked, but the present invention is not limited to this, and, for example, welding or the like. May be joined by.

  Further, in the present embodiment, the form in which the outer surface of the seal ring 1 is plated is exemplified, but the sealed fluid leakage from the caulked portion 1A can be prevented only by the pressure contact force by caulking. Therefore, the seal ring 1 does not need to be plated. Further, when the plating process is applied, it is not necessary to apply it to the entire outer surface of the seal ring 1 as in the present embodiment, and it is sufficient that it is applied to at least the caulked portion 1A.

  The second embodiment of the present invention will be described below. The description of the same configuration as that of the first embodiment and the duplicated configuration will be omitted. As shown in FIG. 5, in the seal ring 100, the inner diameter side end portions 110b, 111b of the metal plates 110, 111 are caulked and the outer diameter side end portions 110a, 111a are axially oriented in the outer diameter direction. It is bent so that it opens to the left and is formed in a V-shape in cross section. That is, the caulking portion 100A is formed on the inner diameter side of the seal ring 100. The seal ring 100 has specifications that are used when the external pressure of the housings 2 and 3 described above is higher than the internal pressure. According to this, the outer diameter side end portions 110a, 111a of the metal plates 110, 111 expand in the axial direction under the pressure of the sealed fluid housed outside the housings 2, 3, so that the sealing performance is improved. To do.

  Note that there are also the following modifications as the housing and the fastening means in the first and second embodiments. As shown in FIG. 6, in the housing 20 of the present modification, the end surface 21 of the flange portion 20a on the side opposite to the housing 30 is inclined so that the thickness thereof becomes thinner toward the outer diameter direction. Similarly, the housing 30 is also inclined such that the end surface 31 of the flange portion 30a on the side opposite to the housing 20 becomes thinner toward the outer diameter direction. The flange portions 20a and 30a have a trapezoidal sectional view in a state where the flange portions 20a and 30a are in contact with each other.

  The band 40 as a fastening means of the housings 20 and 30 in the present modification includes an outer diameter side bottom portion 42 and side portions 41 and 41 extending from both axial ends of the bottom portion 42 so as to expand toward the inner diameter direction. And has a trapezoidal shape in cross section. The band 40 has a C-shape when viewed in the axial direction, and its ends are connected by a screw, and the diameter of the band 40 can be changed by operating the screw (not shown). . By fitting the band 40 onto the flange portions 20a and 30a in the circumferential direction and tightening the screws, the flange portions 20a and 30a are tightened by the band 40. At this time, the side portions 41, 41 of the band 40 are brought into sliding contact with the end faces 21, 31 of the flange portions 20a, 30a, so that the housings 20, 30 are axially close and connected and fixed.

  Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any modifications or additions within the scope of the present invention are included in the present invention. Be done.

  For example, in the above-described embodiment, the form in which the metal plates 10 and 11 are formed in a flat plate shape is illustrated, but the present invention is not limited to this, and the seal ring is bent at the joint between the metal plates as a bending point. If so, the metal plate may be curved. Further, for example, when the metal plate is curved so as to bulge outward in the axial direction, the annular convex portion that comes into contact with the housing does not need to be specially provided.

  Further, in the above-described embodiment, the annular recess 3c for installing the seal ring 1 is provided in the housing 3, but the present invention is not limited to this. For example, the housing 2 may be provided with an annular recess, or the housing may be formed. Shallow grooves may be provided in the holes 2 and 3, respectively, and one annular recess may be formed when the housings 2 and 3 are connected.

  In the above-described embodiment, the metal plates 10 and 11 have been described as examples in which the axial cross section is line-symmetrical with respect to the radial direction. However, for example, one metal plate extends along the radial direction and the other metal plate extends in the radial direction. It may extend in a direction intersecting with, and is not limited to line symmetry.

1 Seal ring 1A Crimped part (joint part)
2,3 housing (cylindrical member)
10, 11 Metal plate (plate member)
10a, 11a Outer diameter side end (one end in the radial direction)
10b, 11b Inner diameter side end (the other end in the radial direction)
10c annular convex portion 12 plated layers 20, 30 housing (cylindrical member)
100 Seal ring 100A Crimped part (joint part)
110,111 Metal plate (plate member)
110a, 111a Outer diameter side end (the other end in the radial direction)
110b, 111b Inner diameter side end (one end in the radial direction)
P1, P2 Action point P3 Bending point

Claims (8)

A metal seal ring which is pressed between two tubular members to seal a gap between the tubular members,
A seal ring comprising two plate members that form an annular shape, one end of which in the radial direction is joined in a sealed manner, and the other end of which is axially separated from each other. .   The seal ring according to claim 1, wherein the plate members are joined in a state where one ends of the plate members are in surface contact with each other.   The seal ring according to claim 1 or 2, wherein one ends of the plate members are caulked.   The one plate member is formed to be longer in the radial direction than the other plate member, and one end of the one plate member is bent to one end side of the other plate member to be caulked. Seal ring described in.   The seal ring according to claim 3 or 4, wherein at least the crimped portions of the plate members at one end are plated.   The seal ring according to any one of claims 1 to 5, wherein an annular convex portion that protrudes outward in the axial direction is formed on the other end side of the plate member.   The outer diameter side end portions of the plate member are hermetically joined to each other, and the inner diameter side end portions of the plate member are configured to be axially separated from each other. Seal ring.   The inner diameter side end portions of the plate member are hermetically joined to each other, and the outer diameter side end portions of the plate member are configured to be axially separated from each other. Seal ring.

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