JPH0534358U - Sealing structure for the flange of containers, etc. - Google Patents

Abstract

(57) [Abstract] [Purpose] With regard to the sealing structure of the flange portion of a container or the like, the permissible deformation amount of the metal sealing material is increased, the corrosion resistance is improved, and the life of the sealing portion is extended. [Structure] A seal structure of a flange portion, which is sealed by a metal seal material sandwiched between both flange surfaces, wherein the metal seal material is formed by covering a seal ring with a titanium coating layer. A titanium coating layer is formed on the surface or the contact surface of the sealing groove with the metal seal material. Since the elastic coefficient of the titanium coating layer is smaller than that of the seal ring or the like, the amount of elastic deformation is increased, the sealing property is enhanced, and titanium improves the corrosion resistance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing structure for a flange portion of a container or the like, and more particularly to a technique for improving the sealing performance of a metal sealing material.

[0002]

[Prior Art]

 In order to secure the sealing property at the mounting part between the container body and the lid that handles high-pressure fluid and at the flange joint part that connects the pipes to each other, the metal seal material sandwiched between both flange surfaces is kept in a pressure contact state. Is done.

FIG. 2 shows a conventional example of a seal structure of the flange portion 3 when the lid 2 is attached to the container body 1. The flange surface 2a of the lid 2 is formed with two concentric seal grooves 2b having different diameters, and a metal seal material 4 is loaded into the seal groove 2b and is fastened by a fastener 5 such as a bolt. The flange surfaces 1a and 2a and the metal seal material 4 are brought into pressure contact with each other to obtain a hermeticity.

[0004]

[Problems to be solved by the device]

 However, with such a seal structure, since the amount of deformation required to maintain the pressed state on the metal seal member 4 depends on the elasticity and hardness of both flange surfaces 1a and 2a and the metal seal member 4. However, when both flange surfaces 1a and 2a are made of, for example, stainless steel, silver and the like, which are relatively softer than this, are the major elements in terms of ensuring sealing performance, but When chlorine or fluorine is contained in the fluid, it becomes insufficient in terms of corrosion resistance and the potential difference with stainless steel becomes large. Therefore, if impurities are present, both flange surfaces 1a and 2a will be corroded. There is a concern that it will be lost.

The present invention has been made in view of such circumstances, and increases the allowable deformation amount. To improve corrosion resistance. To extend the service life. And so on.

[0006]

[Means for Solving the Problems]

 Two means have been proposed to achieve the above objectives. The first means is to use a seal ring made of low alloy steel as the metal seal material in the seal structure of the flange part where the metal seal material sandwiched between both flange surfaces is brought into a pressure contact state to obtain hermeticity. , A structure formed by covering with a titanium coating layer is adopted. The second means is a sealing structure of a flange portion in a container or the like, which is obtained by adding a structure in which a titanium coating layer is formed on the flange surface or the contact surface of the seal groove with the metal sealing material, to the first means. ..

[0007]

[Action]

 In the first means and the second means, when the metal sealing material receives a compressive force, the titanium coating layer is made of a material having a smaller elastic coefficient than the seal ring. Is elastically deformed, and the pressed state is maintained. When the titanium coating layer is formed on the flange surface or the seal groove thereof, the pressure contact state is maintained even by the deformation of this portion. Further, based on the characteristics of the material of titanium, deformation up to a larger stress than that of the seal ring portion is allowed, and corrosion resistance against internal fluid is improved.

[0008]

【Example】

 An embodiment of a seal structure for a flange portion of a container or the like according to the present invention will be described below with reference to FIG. Even in this one embodiment, the case where it is applied to the sealing structure of the flange portion 3 when the lid 2 is attached to the container body 1 described in the prior art is taken as an example. In FIG. 1, reference numeral 2c is a titanium coating layer formed on the inner surface of the seal groove 2b, 2d is a contact surface, 11 is a metal seal material, 11a is a seal ring, and 11b is a titanium coating layer.

The metal seal material 11 shown in FIG. 1 is formed on the surface of the seal ring 11a having a proper wire diameter (for example, wire diameter XX mm) made of low alloy steel such as Inconel 718 material and Inconel 690 material. It is formed by covering the titanium coating layer 11b of about XX μm.

For the titanium coating layer 11b, for example, a coating material prepared by kneading pure Ti powder with a binder paste is applied to the surface of the seal ring 11a, followed by irradiation with a CO ₂ laser and firing. Then, the surface is machined. Further, the coating layer 2c is also formed by the same method.

With such a seal structure, when the metal seal material 4 is sandwiched between the two flange surfaces 1a and 2a and compressed by the flange surface 1a and the contact surface 2d, the metal seal material 4 receives a compressive force and thereby receives the metal. The sealing material 4 is elastically deformed, so that the sealing property is brought into a pressure contact state.

In this case, since the titanium coating layer 11b has a smaller elastic coefficient than the seal ring 11a, a large amount of the titanium coating layer 11b is elastically deformed so that the flange surface 1a and the contact surface 2d are not deformed. On the other hand, the pressure contact state is maintained. When the seal ring 11a is Inconel 718 material, the elastic modulus is 2.1 × 10 ⁴ kg / mm ^{2 The} yield stress is 91 kg / mm ² . When the titanium coating layer 11b is a Ti alloy (Ti-7Al-4Mo), the elastic modulus is 1.19 × 10 ⁴ kg / mm ^{2 The} yield stress is 105 kg / mm ² . Therefore, the titanium coating layers 11b and 2c are more easily elastically deformed than the seal ring 11a and the flange surface 1a, and the pressure contact state between the flange surface 1a, the contact surface 2d, and the metal seal material 11 should be good. You can

In addition, the titanium coating layers 11b and 2c are very strong against seawater and chloride ions due to the material, and are improved in corrosion resistance against internal fluids as compared with the above-mentioned silver and carbon steel. As a result, deformation up to a large stress is allowed.

<Other Embodiments> In the present invention, the following technique can be adopted instead of the embodiment. (1) The target flange part is the flange joint part of the pipe. (2) Forming a titanium coating layer on one or both of the flange surfaces. (3) To form a titanium coating layer in the gap portion of the flange surface that requires particularly corrosion resistance.

[0015]

[Effect of the device]

 As described above, according to the seal structure of the flange portion in the container or the like according to the present invention, a seal ring made of a low alloy steel as a metal seal material is formed by covering a titanium coating layer with a flange surface or Since the titanium coating layer is formed on the contact surface of the seal groove with the metal seal material, the following effects can be obtained. (1) Because the titanium coating layer has a smaller elastic coefficient than the seal ring or the flange surface, elastic deformation is likely to occur, and the allowable deformation amount increases. The holding property of all the pressed state is improved, and the sealing property can be improved. (2) By forming the titanium coating layer on the flange surface or the seal groove thereof, the corrosion resistance of that portion can be improved. (3) The allowable amount of deformation of the metal seal material is large, making it easier to follow changes in temperature and pressure, and improving corrosion resistance, thereby extending the service life of the seal portion. it can.

[Brief description of drawings]

FIG. 1 is a front sectional view of an essential part showing an embodiment of a seal structure for a flange portion of a container or the like according to the present invention.

FIG. 2 is a front sectional view showing a conventional example of a seal structure for a flange portion of a container or the like.

[Explanation of symbols]

 1 Container body 1a Flange surface 2 Lid 2a Flange surface 2b Seal groove 2c Titanium coating layer 2d Contact surface 3 Flange portion 11 Metal seal material 11a Seal ring 11b Titanium coating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koki Nakanishi Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa 1 Ishikawajima Harima Heavy Industries Co., Ltd. Yokohama No. 1 Factory

Claims (2)

[Scope of utility model registration request] 1. A seal structure for a flange portion, wherein a metal seal material sandwiched between both flange surfaces is brought into a pressure contact state to obtain a hermeticity, wherein the metal seal material is a seal ring made of low alloy steel. A sealing structure for a flange portion in a container or the like, which is formed by covering a titanium coating layer. 2. The seal structure for a flange portion of a container or the like according to claim 1, wherein a titanium coating layer is formed on a contact surface of the flange surface or a seal groove thereof with the metal seal material.