JP2016151282A - Seal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member having a configuration in which its use under a quite low load can be performed and at the same time alignment surfaces of a device are not abutted to each other.SOLUTION: This invention relates to a closed annular seal member 100 installed at a dovetail groove 52 arranged at a first member 51, the first member 51 and a second member 61 oppositely arranged against the first member 51 approach to each other and it is abutted against the second member 61 so as to partition its inside and its outside. The seal member comprises a main body 121 arranged at a bottom surface 53 of the dovetail groove 52; a deforming part 131 connected to the main body 121 at a side opposite to the bottom surface 53 of the dovetail groove 52 of the main body part 121 and arranged to be spaced apart in respect to the main body 121 and a salient 141 arranged at the main body 121 and extending toward the deforming part 131.SELECTED DRAWING: Figure 9

Description

  The present invention generally relates to a sealing material, and more particularly to a sealing material mounted in a dovetail groove.

  Regarding the conventional sealing material, for example, in Japanese Patent Application Laid-Open No. 2006-220229, the mounting property in the dovetail groove is good, the delamination resistance is high, and even if the size is increased, the load is low. There is disclosed a dovetail seal material that can obtain a sufficient sealing force and prevents the generation of particles due to metal touch (Patent Document 1).

  The dovetail groove sealing material disclosed in Patent Document 1 is a closed ring-shaped seal material, and is attached to a sealing portion between one member formed with the closed ring-shaped dovetail groove and the other member. The sealing material includes a sealing material main body mounted in the dovetail groove and a lip portion provided on the outer surface of the sealing material main body protruding outward from the dovetail groove and extending in an oblique direction.

JP 2006-220229 A

  As disclosed in Patent Document 1 described above, a sealing material that is mounted in a trapezoidal dovetail groove is known. The dovetail seal material disclosed in Patent Document 1 is a deformable under a low load when it comes into contact with the seal member main body having a sufficient volume to satisfy the stability after mounting in the dovetail groove and the other member. The lip portion is capable of being configured.

  On the other hand, the environment in which the sealing material is used is rapidly expanding, and it is also necessary to use it at an extremely low load (tightening load) that has not been envisaged until now. However, in the above-described conventional sealing material, when the deformation amount of the lip portion exceeds a certain value, the compressive stress generated in the sealing material starts to reach the highly rigid base portion. At this time, since the reaction force from the sealing material to the other member increases rapidly, it becomes difficult to satisfy the use condition at an extremely low load.

  On the other hand, when the compressive load exceeds the reaction force of the sealing material, it is necessary to avoid a state in which the mating surfaces on the apparatus side come into contact with each other.

  An object of the present invention is to solve the above-described problem, and to provide a sealing material that can be used with an extremely low load and has a configuration in which the mating surfaces on the apparatus side do not come into contact with each other. is there.

  The sealing material is mounted in a dovetail groove provided in the first member, and the first member and the second member arranged to face the first member are relatively close to each other and come into contact with the second member. A closed ring-shaped sealing material that divides the inner side and the outer side of the main body part, the main body part disposed on the bottom surface of the dovetail groove, and the main body part on the opposite side of the main body part from the bottom surface of the dovetail groove And a deformation portion disposed at a predetermined distance from the main body portion, and a convex portion provided on the main body portion and extending toward the deformation portion.

  In another embodiment, the outer side is a high-pressure side and the inner side is a low-pressure side, and the deforming portion is provided so that the deforming portion receives pressure on the high-pressure side and closely contacts the second member side. .

  In another form, the deforming portion is a portion after contacting the convex portion rather than before contacting the convex portion when the contact pressure against the second member is pushed by the second member. Becomes higher.

  In another form, the deforming portion is a lip portion having one end connected to the main body portion and the other end extending toward the outside of the dovetail groove.

  In another embodiment, the deformable portion is a bridge portion having both ends connected to the main body portion and a top portion provided in an arc shape extending toward the outside of the dovetail groove.

  As described above, according to the present invention, it is possible to provide a sealing material that can be used at an extremely low load and has a configuration in which the mating surfaces on the apparatus side do not come into contact with each other.

It is a top view which shows the sealing material in related technology. It is sectional drawing which shows the sealing material along the II-II line | wire in FIG. It is sectional drawing which shows the dovetail in related technology. It is sectional drawing which shows the state with the sealing material shown in FIG. 2, and having been mounted | worn with the groove | channel. It is sectional drawing which shows the usage condition of the sealing material in related technology. 4 is a plan view showing a sealing material in Embodiment 1. FIG. It is sectional drawing which shows the sealing material along the VII-VII line in FIG. It is a 1st sectional view showing the state where there was a sealing material in Embodiment 1, and it was installed in a groove. It is a 2nd sectional view showing the state where there was the sealing material in Embodiment 1, and it was installed in the groove. FIG. 3 is a cross-sectional view showing how the sealing material is used in the first embodiment. 5 is a plan view showing a sealing material in Embodiment 2. FIG. It is sectional drawing which shows the sealing material along the XII-XII line | wire in FIG. FIG. 6 is a cross-sectional view showing a dovetail groove in a second embodiment. It is sectional drawing which shows the state with the sealing material in Embodiment 2, and having been mounted | worn with the groove | channel. FIG. 6 is a cross-sectional view showing a usage pattern of a sealing material in a second embodiment. 10 is a plan view showing a sealing material in Embodiment 3. FIG. It is sectional drawing which shows the sealing material along the XVII-XVII line in FIG. It is sectional drawing which shows the state with the sealing material in Embodiment 3, and having mounted | wore with the groove | channel. FIG. 6 is a cross-sectional view showing a usage pattern in a sealing material according to a third embodiment.

  The sealing material in each embodiment based on the present invention will be described below with reference to the drawings. In each embodiment described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

(Related technology)
FIG. 1 is a plan view showing a sealing material in the related art. 2 is a cross-sectional view showing a sealing material along the line II-II in FIG. 1, FIG. 3 is a cross-sectional view showing a dovetail groove in the related art, and FIG. It is sectional drawing which shows the state made.

  With reference to FIGS. 1 to 4, the basic structure of the sealing material 10 in the related art will be described. The sealing material 10 in this related technology is a closed annular sealing material that is mounted in the dovetail groove 52 shown in FIG. The sealing material 10 has a sealing cross section including a main body portion 21 disposed on the bottom surface 53 of the dovetail groove 52 and a lip portion 31 that is bent from an end portion of the main body portion 21 and extends toward the outside of the dovetail groove 52. The seal section has a V-shape in which each of the main body portion 21 and the lip portion 31 extends linearly from a bent position 41 between the main body portion 21 and the lip portion 31. Preferably, the width B1 of the main body portion 21 in the direction orthogonal to the linearly extending direction is preferably larger than the width B2 of the lip portion 31 in the orthogonal direction to the linearly extending direction.

  Next, the structure of the sealing material 10 will be described. The sealing material 10 is a closed annular sealing material and is used to seal between the first member 51 and the second member 61. The sealing material 10 is formed from an elastic member such as rubber. Examples of the rubber material used for the sealing material 10 include fluorine rubber, silicon rubber, and EPDM rubber having a hardness of about 50 to 90 HA. The sealing material 10 has a seal inner diameter Ra.

  The first member 51 and the second member 61 have a mating surface 56 and a mating surface 66, respectively. The first member 51 and the second member 61 are arranged such that the mating surface 56 and the mating surface 66 face each other. For example, a device having the mating surface 56 and the mating surface 66 includes a relief valve. Further, when the high pressure side and the low pressure side (atmosphere side) are partitioned by the sealing material 10, the left side (annular outer side) is the high pressure side and the right side (annular inner side) is the low pressure side in the illustrated cross section. . The same applies to the following embodiments.

  A closed annular dovetail groove 52 is formed in the first member 51. The sealing material 10 is mounted in the dovetail groove 52. The dovetail groove 52 has a groove shape that opens to the mating surface 56 of the first member 51. When the first member 51 is cut by a plane orthogonal to the tangential direction of the dovetail groove 52 extending in a closed ring shape, the dovetail groove 52 has a trapezoidal cross-sectional shape.

  The dovetail groove 52 has a bottom surface 53 and side surfaces 54. The bottom surface 53 extends parallel to the mating surface 56 of the first member 51. The side surface 54 extends in a tapered shape from the opening surface of the dovetail groove 52 on the mating surface 56 of the first member 51 toward the bottom surface 53. The bottom surface 53 and the side surface 54 are connected to each other while being curved.

  In the above description, the dovetail groove 52 in which both the inner diameter side surface 54 and the outer diameter side surface 54 are tapered is described. However, the present invention is not limited thereto, and only the inner diameter side surface 54 is provided in a tapered shape. The sealing material 10 may be attached to the groove.

  When the sealing material 10 is cut by a plane orthogonal to the tangential direction of the sealing material 10 extending in a closed ring shape, the sealing material 10 has a seal cross section including a main body portion 21 and a lip portion 31.

  The main body 21 is disposed on the bottom surface 53 of the dovetail groove 52. The lip portion 31 is bent from the end portion of the main body portion 21 and extends toward the outside of the dovetail groove 52. The seal section of the sealing material 10 is such that the main body portion 21 extends linearly from the bent position 41 between the main body portion 21 and the lip portion 31, and the lip portion 31 is between the main body portion 21 and the lip portion 31. A V-shape that extends linearly from the bent position 41 is formed. The main body portion 21 and the lip portion 31 intersect at an angle smaller than 90 °.

  The main body portion 21 has a distal end portion 22. The distal end portion 22 is provided at the distal end where the main body portion 21 extends linearly from a bending position 41 between the main body portion 21 and the lip portion 31. The distal end portion 22 is disposed immediately above the bottom surface 53 of the dovetail groove 52. The lip portion 31 has a tip portion 32. The lip portion 31 is provided at a tip end where the lip portion 31 extends linearly from a bent position 41 between the main body portion 21 and the lip portion 31. The distal end portion 32 is disposed outside the dovetail groove 52.

  The main body portion 21 extends in a direction parallel to the bottom surface 53 of the dovetail groove 52 from the bent position 41 between the main body portion 21 and the lip portion 31 toward the distal end portion 22. The lip portion 31 extends in a direction parallel to the side surface 54 of the dovetail groove 52 from the bent position 41 between the main body portion 21 and the lip portion 31 toward the distal end portion 32.

  The main body 21 has a front surface 21a and a back surface 21b. The surface 21 a contacts the bottom surface 53 of the dovetail groove 52. The back surface 21b is disposed on the back side of the front surface 21a. The front surface 21a and the back surface 21b extend in parallel to each other. The lip portion 31 has a front surface 31a and a back surface 31b. The surface 31 a contacts the side surface 54 of the dovetail groove 52. The back surface 31b is disposed on the back side of the front surface 31a. The front surface 31a and the back surface 31b employ a structure extending in parallel with each other, but the structure is not limited to this.

  The width B1 of the main body portion 21 in the direction orthogonal to the linearly extending direction is preferably larger than the width B2 of the lip portion 31 in the direction orthogonal to the linearly extending direction. The width B1 of the main body portion 21 is a length between the front surface 21a and the back surface 21b, and the width B2 of the lip portion 31 is a length between the front surface 31a and the back surface 31b of the lip portion 31. In this related technology, the width B1 of the main body portion 21 is equal to the width B2 of the lip portion 31.

  The cross-sectional area of the main body portion 21 is preferably equal to or larger than the cross-sectional area of the lip portion 31. In this related technology, the cross-sectional area of the main body portion 21 is equal to the cross-sectional area of the lip portion 31.

  In this related technique, the length L1 of the main body portion 21 in the linearly extending direction is equal to the length L2 of the lip portion 31 in the linearly extending direction (L1 = L2). The seal material 10 has a seal cross section in which a shape connecting the tip portion 42 at the bent position 41, the tip portion 22 of the main body portion 21, and the tip portion 32 of the lip portion 31 is an isosceles triangle.

  The shapes of the distal end portion 22 and the distal end portion 32 are not particularly limited, but in the case of this related technology, the front surface 21a and the rear surface 21b are connected to each other while being curved at the distal end portion 22, and the front surface 31a and the rear surface 31b are Are connected to each other while curving.

  By making the tip portion 32 of the lip portion 31 into a curved shape, the lip portion 31 can be elastically deformed more smoothly when the sealing member 10 is pressed by the second member 61.

  The curvature radius (seal top) of the distal end portion 32 is preferably greater than 0 and less than or equal to the width B2 / 2 of the lip portion 31, and the curvature radius of the distal end portion 22 is greater than 0 and the width B1 of the main body portion 21 ÷. It is preferable that it is 2 or less.

  The surface 21 a and the surface 31 a are connected to each other while being bent at the bent position 41. The back surface 21 b and the back surface 31 b are connected to each other while being bent at the bent position 41. In this related technology, the curvature radius Rx at the position where the front surface 21a and the front surface 31a are continuous is smaller than the curvature radius Ry at the position where the back surface 21b and the back surface 31b are continuous.

  The curvature radius Rx at the position where the surface 21a and the surface 31a of the sealing material 10 are continuous is preferably greater than or equal to the curvature radius Rz at the position where the bottom surface 53 and the side surface 54 of the dovetail groove 52 are continuous. With such a configuration, the sealing material 10 can be provided along the groove inner diameter of the dovetail groove 52.

  According to such a configuration, the cross-sectional deformation due to the expansion of the sealing material 10 can be suppressed, and the sealing material 10 can be provided in a form along the groove inner diameter of the dovetail groove 52. Thereby, since the sealing material 10 is provided and the groove inner diameter of the groove 52 is tightened with an appropriate pressure, the mounting property of the sealing material 10 in the dovetail groove 52 and the stability of the sealing material 10 after mounting are improved. Can be made.

  The seal height H of the sealing material 10 with respect to the surface 21a of the main body 21 is set to be equal to or higher than the groove height h of the dovetail groove 52 (H ≧ h).

  When the groove angle formed by the bottom surface 53 and the side surface 54 of the dovetail groove 52 is α, the seal angle β formed by the surface 21a of the main body portion 21 and the surface 31a of the lip portion 31 is 0.7α ≦ β ≦ 1. It is preferable to satisfy the 3α relationship.

  According to such a configuration, the sealing material 10 can be provided in a form along the groove inner diameter of the dovetail groove 52. Thereby, when the sealing material 10 is attached to the dovetail groove 52, a state in which the sealing material 10 is hooked on the inner diameter of the groove is obtained, and workability at the time of attachment can be improved. Further, by ensuring the installation property of the sealing material 10 in the dovetail groove 52, it is possible to prevent the sealing material 10 from being twisted in the dovetail groove 52 and falling off from the dovetail groove 52. In this related technology, the sealing angle β of the sealing material 10 is equal to the groove angle α of the dovetail groove 52.

  FIG. 5 is a cross-sectional view showing how the sealing material 10 is used in the related art. With reference to FIG. 1 to FIG. 5, the seal member 10 mounted in the dovetail groove 52 is pressed against the second member 61, thereby sealing between the first member 51 and the second member 61. At this time, a minute gap is formed between the mating surface 56 of the first member 51 and the mating surface 66 of the second member 61. The lip portion 31 comes into contact with the mating surface 66 of the second member 61 and is elastically deformed toward the inside of the dovetail groove 52 by being pressed.

  For example, a relief valve employing the above configuration is used for adjusting the internal pressure of the vacuum vessel. Specifically, the 2nd member 61 as a valve body is urged | biased by the 1st member 51 as a housing | casing which has a connection port with a spring. The first member 51 is provided with a connection port (not shown) at the center position of the annular seal member 10. In relief valves with such specifications, it is required to reduce the pressing load of the compression coil spring to the minimum in order to enable relief with a small differential pressure, and even if the processing accuracy of the relief valve is not high, compression is required. It is required to move the valve body in the closing direction using the biasing force and differential pressure of the coil spring. The sealing material 10 in this related technology is suitably used for such applications.

  However, in the sealing material 10 according to the related art, when the compressive load according to the specifications of the apparatus is constant and the shape and physical properties of the sealing material are uniform, the flange is located when the reaction force between the compressive load and the sealing material 10 is balanced. However, when the compressive load exceeds the reaction force of the sealing material due to variations, the first member 51 and the second member 61 may be allowed to contact each other.

(Embodiment 1)
Next, referring to FIGS. 6 to 9, the sealing material 100 in the first embodiment will be described. 6 is a plan view showing the sealing material 100 in the first embodiment, FIG. 7 is a cross-sectional view showing the sealing material along the line VII-VII in FIG. 6, and FIGS. 8 and 9 are in the embodiment. It is the 1st and 2nd sectional view showing the state where seal material 100 was installed in a slot. Note that the form of the dovetail groove 52 to which the sealing material 100 of the present embodiment is mounted is basically the same as the dovetail groove shown in FIG. Will not be repeated.

  With reference to FIGS. 6 to 9, the basic structure of sealing material 100 in the present embodiment will be described. The sealing material 100 in the present embodiment is a closed annular sealing material mounted in the dovetail groove 52. The sealing material 100 includes a main body part 121 disposed on the bottom surface 53 of the dovetail groove 52, and a lip part as a deformed part that has one end connected to the main body part 121 and has the other end part extending toward the outside of the groove. 131 with a sealing cross section. The lip portion 131 is connected to the main body portion 121 on the side opposite to the bottom surface 53 of the dovetail groove 52 of the main body portion 121 and is disposed at a predetermined distance from the main body portion 121.

  The cross section of the seal has a V shape in which each of the main body 121 and the lip 131 extends linearly from the bent position 141 between the main body 121 and the lip 131. Preferably, the width B1 of the main body 121 in the direction orthogonal to the direction extending linearly is preferably larger than the width B2 of the lip 131 in the direction orthogonal to the direction extending linearly.

  Next, the structure of the sealing material 100 will be specifically described. The sealing material 100 is a closed annular sealing material, and is used to seal between the first member 51 and the second member 61. The sealing material 100 is formed from an elastic member such as rubber. Examples of the rubber material used for the sealing material 100 include fluorine rubber having a hardness of about 50 to 90 HA, silicon rubber, and EPDM rubber. The sealing material 10 has a seal inner diameter Rb.

  When the sealing material 100 is cut by a plane orthogonal to the tangential direction of the sealing material 100 extending in a closed ring shape, the sealing material 100 has a seal cross section including a main body portion 121 and a lip portion 131.

  The main body 121 is disposed on the bottom surface 53 of the dovetail groove 52. The lip 131 is bent from the end of the main body 121 and extends toward the outside of the dovetail groove 52. The sealing section of the sealing material 100 is such that the main body 121 extends linearly from the bent position 141 between the main body 121 and the lip 131, and the lip 131 is between the main body 121 and the lip 131. It forms a V shape extending linearly from the bending position 141. The main body 121 and the lip 131 intersect at an angle smaller than 90 °.

  The main body 121 has a distal end portion 122. The front end 122 is provided at the front end where the main body 121 extends linearly from a bending position 141 between the main body 121 and the lip 131. The distal end portion 122 is disposed immediately above the bottom surface 53 of the dovetail groove 52. The lip part 131 has a tip part 132. The lip portion 131 is provided at a tip end where the lip portion 131 extends linearly from a bending position 141 between the main body portion 121 and the lip portion 131. The distal end portion 132 is disposed outside the dovetail groove 52.

  The main body part 121 extends in a direction parallel to the bottom surface 53 of the dovetail groove 52 from the bent position 141 between the main body part 121 and the lip part 131 toward the distal end part 122. The lip portion 131 extends in a direction parallel to the side surface 54 of the dovetail groove 52 from the bent position 141 between the main body portion 121 and the lip portion 131 toward the distal end portion 132.

  The main body 121 has a front surface 121a and a back surface 121b. The surface 121 a contacts the bottom surface 53 of the dovetail groove 52. The back surface 121b is disposed on the back side of the front surface 121a. The front surface 121a and the back surface 121b extend substantially parallel to each other. The lip 131 has a front surface 131a and a back surface 131b. The surface 131 a contacts the side surface 54 of the dovetail groove 52. The back surface 131b is disposed on the back side of the front surface 131a. The front surface 131a and the back surface 131b extend in parallel to each other.

  The width B1 of the main body 121 in the direction orthogonal to the direction extending linearly is preferably larger than the width B2 of the lip 131 in the direction orthogonal to the direction extending linearly. The width B1 of the main body 121 is the length between the front surface 121a and the back surface 121b, and the width B2 of the lip portion 131 is the length between the front surface 131a and the back surface 131b of the lip portion 131. In the present embodiment, the width B <b> 1 of the main body 121 is provided larger than the width B <b> 2 of the lip 131.

  Furthermore, the front-end | tip part 122 of the main-body part 121 is provided with the convex part 151 extended to the lip part 131 side. The width H2 of the convex portion 151 in the direction orthogonal to the linearly extending direction is preferably larger than the width B1 of the main body 121 in the direction orthogonal to the linearly extending direction.

  The shapes of the front end portion 122, the convex portion 151, and the front end portion 132 are not particularly limited, but in the case of the present embodiment, the front surface 121a and the rear surface 121b are connected to each other while being curved at the front end portion 122 and the convex portion 151, The convex portion 151 is provided with a curved convex surface 152 located on the lip portion 131 side. The surface of the convex surface 152 is continuous with the tip portion 122 and the hypotenuse 151a, and the back surface 121b is also continuous with the hypotenuse 151b. . Further, the front surface 131a and the back surface 131b are connected to each other while being curved at the front end portion 132.

  By making the tip portion 132 of the lip portion 131 into a curved shape, the lip portion 131 can be elastically deformed more smoothly when the sealing member 100 is pressed by the second member 61. In addition, by forming the distal end portion 122 of the main body portion 121 into a curved shape, even if the sealing material 100 is in a state in which the main body portion 121 and the lip portion 131 are reversed and is attached to the groove 52, the second portion. When the sealing material 100 is pressed by the member 61, the main body 121 can be elastically deformed more smoothly. Further, by providing the convex portion 151, the position of the convex portion 151 can be visually confirmed, and the reverse mounting of the sealing material 100 can be prevented in advance.

  The radius of curvature (seal top) of the distal end portion 132 is preferably greater than 0 and less than or equal to the width B2 / 2 of the lip portion 131, and the radius of curvature of the distal end portion 122 is greater than 0 and the width B1 of the main body portion 121 ÷. It is preferable that it is 2 or less. The radius of curvature of the convex 151 may be larger than zero.

  The surface 121a and the surface 131a are connected to each other while being bent at the bending position 141. The back surface 121b and the back surface 131b are connected to each other while being bent at the bending position 141.

  In the sealing material 100 according to the present embodiment, in order to achieve an extremely low load, prevent contact between the first member 51 and the second member 61, and further prevent rolling, (a ) The seal width (L1) is equal to or less than the dovetail groove bottom width (L3), preferably “opening width of dovetail groove 52 (L4) × (1.1 to 1.2)”. It is good to also prevent falling off from the opening. Further, (b) the seal thickness (B1) is preferably “the depth of the groove 52 (h) × (0.2 to 0.4)”. (C) The convex portion height (H2) is preferably equal to or greater than “the groove 52 depth (h) −the seal thickness (B1)”. (D) The base height (B1) is preferably “convex height (H2) × (0.4 to 0.6)”. (E) The seal angle (β) may be “the dovetail groove angle (α) ± 30%”.

  According to such a configuration, the cross-sectional deformation due to the expansion of the sealing material 100 can be suppressed, and the sealing material 100 can be provided along the groove inner diameter of the dovetail groove 52. Thereby, since the sealing material 100 is provided and the groove inner diameter of the groove 52 is tightened with an appropriate pressure, the mounting property of the sealing material 100 in the groove 52 and the stability of the sealing material 100 after mounting are improved. Can be made.

  FIG. 10 is a diagram showing a usage pattern of the sealing material 100 of the present embodiment. With reference to FIGS. 8 to 10, the seal member 100 mounted in the dovetail groove 52 comes into pressure contact with the second member 61, thereby sealing between the first member 51 and the second member 61. At this time, as shown in FIG. 9, the lip 131 comes into contact with the second member 61, and the lip 131 starts to fall toward the first member 51. Thereafter, when the relative distance S between the first member 51 and the second member 61 becomes smaller, the lip portion 131 comes into contact with the convex surface 152 of the convex portion 151.

  At this time, the lip portion 131 has a contact pressure on the second member 61 after the lip portion 131 comes into contact with the convex portion rather than before the lip portion 131 comes into contact with the convex portion 152 when the lip portion 131 is pushed by the second member 61. Becomes higher. That is, the compression reaction force of the sealing material 100 was the compression reaction force of only the lip portion 131 before the lip portion 131 abuts on the convex portion 152, but the lip portion 131 abuts on the convex portion 152. After that, the total compression reaction force of the lip portion 131 and the main body portion 121 is switched.

  As a result, even if a load greater than the reaction force of the sealing material 100 is applied between the first member 51 and the second member 61, the first member 51 and the second member 61 do not come into contact with each other. The minute gap can be surely formed between the mating surface 56 of the first member 51 and the mating surface 66 of the second member 61. Thereby, generation | occurrence | production of the damage | wound to the 1st member 51 and the 2nd member 61, and dusting of the metal powder by contact can be suppressed.

  Moreover, since the convex part 151 is provided in the main-body part 121 of the sealing material 100 of this Embodiment, discrimination | determination with the main-body part 121 provided with the convex part 152 and the lip | rip part 131 becomes easy, and a sealing material It becomes easy to distinguish the directionality when attaching to the 100 groove 52, prevents the body part 121 and the lip part 131 from being reversed, and makes contact with both the inner and outer wall surfaces of the dovetail groove 52. Thus, it is possible to prevent rolling due to generation of torsional torque.

  Furthermore, according to the sealing material 100 in the present embodiment, since the distance between the first member 51 and the second member 61 can be adjusted by adjusting the size of the lip 131, the conventional cross-sectional shape is Compared to the circular O-ring, it is possible to provide a wider sealable range between the first member 51 and the second member 61.

  Furthermore, according to the sealing material 100 in the present embodiment, since the conventional O-ring having a circular cross-sectional shape can be installed in the dovetail groove 52, the sealing material is used as the sealing material in the present embodiment. It is possible to improve the sealing performance between the first member 51 and the second member 61 only by changing to 100.

(Embodiment 2)
The sealing material 200 in Embodiment 2 is demonstrated with reference to FIGS. 11 is a plan view showing the sealing material 200 in the second embodiment, FIG. 12 is a cross-sectional view showing the sealing material 200 along the line XII-XII in FIG. 11, and FIG. 13 is a cross-sectional view showing a dovetail groove FIG. 14 is a cross-sectional view showing a state in which the sealing material 200 according to the second embodiment is installed in a groove.

  With reference to FIGS. 11 to 14, a basic structure of sealing material 200 in the present embodiment will be described. The sealing material 200 in the present embodiment is a closed annular sealing material mounted in the dovetail groove 52 shown in FIG. In the case where the high pressure side and the low pressure side (atmosphere side) are partitioned by the sealing material 200, the left side (annular outer side) is the high pressure side and the right side (annular inner side) is the low pressure side in the illustrated cross section. .

  The sealing material 200 includes a main body portion 240 disposed on the bottom surface 53 of the dovetail groove 52, and a lip portion as a deformed portion that has one end connected to the main body portion 240 and has the other end portion extending toward the outside of the groove. 231 having a sealing cross section. The lip portion 231 is connected to the main body portion 240 on the side opposite to the bottom surface 53 of the dovetail groove 52 of the main body portion 240 and is disposed at a predetermined distance from the main body portion 240.

  As for the seal cross section, the main body portion 240 has a substantially rectangular shape as a whole, and the lip portion 231 protrudes obliquely upward. The most projecting width W1 of the main body 240 is larger than the upper end opening width GW1 of the dovetail groove 52, and the lower end width (flat portion width) W2 and the upper end width (corner perimeter width) W3 are the dovetail groove 52. Is provided smaller than the upper end opening width GW1. In the present embodiment, the most protruded width W1 and convex part height H3 of the main body part 240 are set to substantially the same dimensions.

  Next, the structure of the sealing material 200 will be specifically described. The sealing material 200 is a closed annular sealing material and is used for sealing between the first member 51 and the second member 61. The sealing material 200 is formed from an elastic member such as rubber. Examples of the rubber material used for the sealing material 200 include fluorine rubber, silicon rubber, and EPDM rubber having a hardness of about 50 to 90 HA. The sealing material 200 has a seal inner diameter Rc.

  The first member 51 and the second member 61 have a mating surface 56 and a mating surface 66, respectively. The first member 51 and the second member 61 are arranged such that the mating surface 56 and the mating surface 66 face each other. For example, a device having the mating surface 56 and the mating surface 66 includes a relief valve.

  A closed annular dovetail groove 52 is formed in the first member 51. The sealing material 200 is attached to the dovetail groove 52. The dovetail groove 52 has a groove shape that opens to the mating surface 56 of the first member 51. When the first member 51 is cut by a plane orthogonal to the tangential direction of the dovetail groove 52 extending in a closed ring shape, the dovetail groove 52 has a cross section in which the upper end opening 54a forms the narrowest opening and the opening increases in diameter toward the inside. Has a shape.

  The dovetail groove 52 has a bottom surface 53 and a side surface 54, and has a substantially bowl shape in cross section. The bottom surface 53 extends parallel to the mating surface 56 of the first member 51. The side surface 54 extends downward from the opening surface of the dovetail groove 52 in the mating surface 56 of the first member 51 toward the bottom surface 53. The bottom surface 53 and the side surface 54 are connected to each other while being curved.

  When the sealing material 200 is cut by a plane orthogonal to the tangential direction of the sealing material 200 extending in a closed ring shape, the sealing material 200 has a seal cross section including a main body portion 240 and a lip portion 231.

  The main body 240 is disposed on the bottom surface 53 of the dovetail groove 52. On the bottom surface of the main body 240, a surface 221a having a concave portion recessed toward the inside is provided. The lip portion 231 extends obliquely upward from the inside to the outside of the upper end portion of the main body portion 240. The seal section of the seal material 200 is such that the upper surface of the main body 240 and the lip 231 form a V shape. The upper surface of the main body portion 240 and the lip portion 231 intersect at an angle smaller than 90 °.

  The main body 240 has a front surface 221a and a back surface 221b. The surface 221 a contacts the bottom surface 53 of the dovetail groove 52. The back surface 221b is disposed on the back side of the front surface 221a. The front surface 221a and the back surface 221b extend substantially parallel to each other. The lip portion 231 has a front surface 231a and a back surface 231b. The surface 231 a protrudes outside the dovetail groove 52. The back surface 231b is disposed on the back side of the front surface 231a. The front surface 231a and the back surface 231b employ a structure extending in parallel with each other, but the present invention is not limited to this.

  On the upper surface of the main body portion 240, a convex portion 241 extending toward the lip portion 231 is provided. Although the shape of the convex part 241 and the front-end | tip part 232 is not specifically limited, In the case of this Embodiment, the side surface 241a and the convex part 242 are mutually connected while curving, and the convex part 241 is located in the lip | rip part 131 side. A curved convex surface 242 is provided, and the surface of the convex surface 242 is continuous with the rear surfaces 221b and 241b.

  By making the tip portion 232 of the lip portion 231 into a curved shape, the lip portion 231 can be elastically deformed more smoothly when the sealing member 100 is pressed by the second member 61.

  The radius of curvature (seal top) of the tip 232 is preferably greater than 0 and less than or equal to the width B2 / 2 of the lip 231.

  In the sealing material 200 in the present embodiment, from the viewpoint of realizing a very low load, preventing contact between the first member 51 and the second member 61, and further preventing rolling (a). The corner contact portion width (W3) and the flat portion width (W2) are each preferably “upper end opening width (GW1) × 90%”. (B) The convex portion height (H3) is preferably equal to or greater than “groove depth (GH1) − (seal thickness (B2))”. (C) The height per corner (K1) may be “groove depth (GH1) − (groove opening R or more and 3 × groove opening R or less”. (D) The shape of the back surface 221a may be flat. There should be a dent going inward.

  According to such a configuration, the cross-sectional deformation due to the expansion of the sealing material 200 can be suppressed, and the sealing material 200 can be provided along the groove inner diameter of the dovetail groove 52. Thereby, since the sealing material 200 is provided in a state in which the groove inner diameter of the groove 52 is tightened with an appropriate pressure, the mounting performance of the sealing material 200 in the groove 52 and the stability of the sealing material 200 after mounting are improved. Can be made.

  FIG. 15 is a cross-sectional view showing a usage pattern in the sealing material 200 of the present embodiment. Referring to FIGS. 14 and 15, the seal member 200 mounted in the dovetail groove 52 is pressed against the second member 61, whereby the first member 51 and the second member 61 are sealed. Similarly to the case shown in FIGS. 8 to 10, the lip portion 231 comes into contact with the second member 61, and the lip portion 231 starts to fall toward the first member 51 side. Thereafter, when the relative distance between the first member 51 and the second member 61 is further reduced, the lip portion 231 contacts the convex surface 242 of the convex portion 241.

  At this time, the lip portion 231 has a contact pressure against the second member 61 after the lip portion 231 is in contact with the convex portion 242 rather than before the lip portion 231 is in contact with the convex portion 242 when the lip portion 231 is pressed by the second member 61. Will be higher. That is, the compression reaction force of the sealing material 200 was the compression reaction force of only the lip part 231 before the lip part 231 abuts on the projection part 242, but the lip part 231 abuts on the projection part 242. After that, the total compression reaction force of the lip portion 231 and the main body portion 241 is switched.

  As a result, even if a load greater than the reaction force of the sealing material 200 is applied between the first member 51 and the second member 61, the first member 51 and the second member 61 do not come into contact with each other. The minute gap can be surely formed between the mating surface 56 of the first member 51 and the mating surface 66 of the second member 61. Thereby, generation | occurrence | production of the damage | wound to the 1st member 51 and the 2nd member 61, and dusting of the metal powder by contact can be suppressed.

  In addition, since the main body 240 of the sealing material 200 of the present embodiment has a form in which the main body 240 is easily visible, it is easy to distinguish between the main body 240 and the lip 231 and prevent erroneous mounting. In addition, by making contact with both the inner and outer wall surfaces of the dovetail groove, it is possible to prevent rolling due to generation of torsional torque. Further, since the cross section of the main body 240 is a rectangular shape having a thickness, the mounting property inside the dovetail groove and the prevention of rolling are improved, and the presence of the sealing material 200 due to compression load and torque is provided. It is possible to prevent movement inside the groove. In addition, the same effects as those of the first embodiment can be obtained.

(Embodiment 3)
FIG. 16 is a plan view showing the sealing material 300 in the third embodiment. 17 is a cross-sectional view showing the sealing material 300 along the line XVII-XVII in FIG. Note that the form of the dovetail groove 52 to which the sealing material 300 of the present embodiment is mounted is basically the same as the dovetail groove shown in FIG. Will not be repeated. FIG. 18 is a cross-sectional view showing a state in which the sealing material 300 according to the embodiment is provided and installed in the groove 52.

  With reference to FIGS. 16 to 18, a basic structure of sealing material 300 in the present embodiment will be described. The sealing material 300 in the present embodiment is a closed annular sealing material mounted in the dovetail groove 52 shown in FIG. The sealing material 300 includes a main body portion 321 disposed on the bottom surface 53 of the dovetail groove 52, a convex portion 341 extending upward at the upper end portion of the main body portion 321, and a gap 321v with respect to the convex portion 341. Both ends are connected to the portion 321, and has a seal section having a top portion provided in an arc shape and a bridge portion 331 protruding toward the outside of the groove 52. Further, when the high pressure side and the low pressure side (atmosphere side) are partitioned by the sealing material 300, the left side (annular outer side) is the high pressure side and the right side (annular inner side) is the low pressure side in the illustrated cross section. .

  When the sealing material 300 is cut by a plane orthogonal to the tangential direction of the sealing material 300 extending in a closed ring shape, the sealing material 300 has a seal cross section including a main body portion 321 and a bridge portion 331. As for the seal cross section, the main body portion 321 has a substantially rectangular shape as a whole, and the convex portion 341 and the bridge portion 331 have a triangular shape convex upward. The gap 321v has a shape in which the V shape is turned upside down.

  The sealing material 300 is a closed annular sealing material and is used for sealing between the first member 51 and the second member 61. The sealing material 300 is formed from an elastic member such as rubber. Examples of the rubber material used for the sealing material 300 include fluorine rubber, silicon rubber, and EPDM rubber having a hardness of about 50 to 90 HA. The sealing material 300 has a seal inner diameter Rd.

  The main body 321 is disposed on the bottom surface 53 of the dovetail groove 52. The bridge portion 331 is provided on the upper portion of the main body portion 321 and extends toward the outside of the dovetail groove 52. The bridge portion 331 has a tip portion 332. Further, the bridge portion 331 is provided with a plurality of gas vent holes 331h that allow air to reciprocate between the gap 321v and the outside when the bridge portion 331 is deformed. The sealing material 300 of the present embodiment is provided with gas vent holes 331h at four positions at a pitch of 90 degrees. The number of the gas vent holes 331h is appropriately selected according to the size of the sealing material 300.

  By making the tip portion 332 and the convex portion 341 of the bridge portion 331 into a curved shape, the bridge portion 331 can be elastically deformed more smoothly when the sealing member 300 is pressed by the second member 61.

  In the sealing material 300 in the present embodiment, from the viewpoint of realizing a very low load, preventing contact between the first member 51 and the second member 61, and further preventing rolling, (a) the gap 321v It is preferable to process a plurality of gas vent holes 331h on the high-pressure side. (B) The seal width (L6) is equal to or larger than the opening width (L4) of the dovetail groove 52, preferably the opening width (L4) of the dovetail groove 52 × (1.1 to 1.3). It is also preferable to prevent the dropout from the opening 52. Also, (c) the seal height (SH) is preferably equal to or greater than the “depth of the dovetail groove 52 (h)”. (D) The seal thickness (B2) is preferably “the depth of the dovetail groove 52 (h) × (0.2 to 0.4)”. (E) The height of the convex portion (H6) is preferably equal to or greater than “the depth of the groove 52 (h) −the thickness of the seal (B2)”.

  Further, the inner diameter of the opening width (L4) of the dovetail groove 52> the seal inner diameter (Rd) of the sealing material 300, preferably the seal inner diameter (Rd) = the inner diameter of the opening width (L4) of the dovetail groove 52 × (0.99 to 0.95), the deformation of the cross section due to the expansion of the sealing material 300 can be suppressed, and the sealing material 300 can be provided along the groove inner diameter of the groove 52. Thereby, since the sealing material 300 is provided in a state where the groove inner diameter of the groove 52 is tightened with an appropriate pressure, the mounting property of the sealing material 300 to the groove 52 and the stability of the sealing material 300 after mounting are improved. Can be made.

  FIG. 19 is a cross-sectional view showing a usage pattern in the sealing material 300 of the present embodiment. Referring to FIGS. 18 and 19, the seal member 300 mounted in the dovetail groove 52 is pressed against the second member 61, whereby the first member 51 and the second member 61 are sealed. At this time, the distal end portion 332 of the bridge portion 331 is greatly deformed toward the first member 51 side, and the distal end portion 332 contacts the convex portion 341.

  As in the case shown in FIGS. 8 to 10, the bridge portion 331 contacts the second member 61, and the bridge portion 331 starts to fall toward the first member 51 side. Thereafter, when the relative distance between the first member 51 and the second member 61 is further reduced, the bridge portion 331 contacts the convex portion 341.

  At this time, the bridge portion 331 has a contact pressure against the second member 61 after contacting the convex portion 341 rather than before the bridge portion 331 is pressed against the convex portion 341 when the bridge portion 331 is pushed by the second member 61. Will be higher. That is, the compression reaction force of the bridge portion 331 was only the compression reaction force of the bridge portion 331 before the bridge portion 33 contacted the convex portion 341, but the bridge portion 331 contacted the convex portion 341. After that, the total compression reaction force of the bridge portion 331 and the main body portion 321 is switched.

  As a result, even if a load greater than the reaction force of the sealing material 300 is applied between the first member 51 and the second member 61, the first member 51 and the second member 61 do not come into contact with each other. The minute gap can be surely formed between the mating surface 56 of the first member 51 and the mating surface 66 of the second member 61. Thereby, generation | occurrence | production of the damage | wound to the 1st member 51 and the 2nd member 61, and dusting of the metal powder by contact can be suppressed.

  In the case of the configuration employing the lip portions 131 and 231 shown in the first and second embodiments, when the seal reaction force until the lip portions 131 and 231 come into contact with the convex portions 151 and 241 is low, this By adopting the configuration of the embodiment, as a result of an increase in the deformation area of the distal end portion 332, the seal reaction force can be increased. In addition, the same effects as those of the first and second embodiments can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  51 First member, 52 Dovetail groove, 53 Bottom surface, 54, 241a Side surface, 54a Upper end opening, 56 Matching surface, 61 Second member, 100, 200, 300 Sealing material, 121, 240, 321 Main body portion, 121a, 121a , 131a, 221a, 221a, 231a Front surface, 121b, 121b, 131b, 221b, 231b, 231b, 241b Back surface, 122, 132 Tip portion, 131, 231 Lip portion, 141 Bending position, 151, 241 Convex portion, 151a, 151b Oblique side, 152, 242, 341 convex part, 232, 332 tip part, 321v gap, 331 bridge part, 331h degassing hole.

Claims (5)

The first member is mounted in a dovetail groove provided in the first member, and the first member and the second member disposed to face the first member are relatively close to each other, and contact with the second member to thereby move the inside thereof. A closed annular sealing material that partitions the outside,
A main body disposed on the bottom surface of the dovetail groove;
On the side opposite to the bottom surface of the dovetail groove of the main body portion, the deformation portion is connected to the main body portion and arranged at a predetermined distance from the main body portion,
A convex portion provided on the main body portion and extending toward the deformation portion;
A sealing material. The outside is the high pressure side, the inside is the low pressure side,
The sealing material according to claim 1, wherein the deforming portion is provided so that the deforming portion receives a pressure on a high-pressure side and closely contacts the second member side.   The deformation portion has a higher contact pressure with respect to the second member after contact with the convex portion than before contact with the convex portion by being pressed by the second member. The sealing material according to 1 or 2. The deformation part is
The sealing material according to any one of claims 1 to 3, wherein one end portion is connected to the main body portion, and the other end portion is a lip portion extending toward the outside of the dovetail groove. The deformation part is
The seal material according to any one of claims 1 to 3, wherein both ends of the main body are connected to each other, and a top portion provided in an arc shape is a bridge portion extending toward the outside of the dovetail groove.

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