JPS58163865A - Method of sealing grooved type flange - Google Patents

Abstract

PURPOSE:To obtain stability of long period and high reliability to grooved type flanges of various shapes, by casting liquid sealing material in the groove of the grooved type flange into which an annular bank of one of joint surfaces is fitted, and pressingly mating both joint surfaces after the sealing material is cured. CONSTITUTION:A circular bank 3 on one of flanges is abutted to a sealing material 7 which is made resilient in a groove 5, and then the opposite surfaces of both flanges are pressingly contacted together by fastening a bolt 6 so that sealing is obtained. Since the sealing material 7 is held in a thickness larger than the clearance between the top of the bank 3 and the bottom of the groove 5, the sealing material 7 is partly built up into the gaps each defined between one of the lateral walls of the circular bank 3 and the associated lateral wall of the groove 5 when both flanges are mated at their opposed contacting surfaces 8 in the condition of metal touch. Thereby, the surface pressure exerted to the outer surface of the resilient material 7 given with resiliency, is relaxed so that it is not subjected directly to rigid strain due to flange vibration, thereby liquid leakage due to pumping action may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sealing a grooved flange having a continuous annular part on one side of the seam between two surfaces and a groove corresponding to the part on the other side. Figure 1 is a partial cross-sectional view showing the sealing portion of a conventional grooved flange. In the figure, 1 is a 7-flange having a circular part, 2 is a 7-flange with a groove, 3 is a circular part, 4 is a molded gasket, and 5
indicates a groove, and 6 indicates a bolt.

As shown in Fig. 1, the method of connecting the grooved type 7 flange is to attach a regular molded gasket 4 around the tip of the embankment 3 of the flange l.
There is a known sealing method in which the flange 2 is mounted, set in the groove 5 of the corresponding flange 2 and aligned, and the opposing surfaces are strongly tightened with a port 6.

This method is common for circular pipe flanges that do not have complicated curves, but the protruding height of the circular part of one flange and the depth of the groove of the other flange are made to be the same. It is characterized by the presence of

In this case, sealing is achieved by strong pressure contact between the end face of the molded gasket attached to the circular machine part and the corresponding ground surface of one of the seven flange grooves. If it is returned, a pumping phenomenon occurs on the ground surface, which causes liquid to leak. Furthermore, the molded gasket became brittle due to the reversing of the punching due to vibration, and long-term stability and reliability could not be obtained.

On the other hand, molded gaskets require many steps and labor when molding, and require high level of technical management to ensure uniformity during mass production, which inevitably leads to increased costs.

Therefore, it is rarely used for flanges with complex shapes. The present invention is a sealing method obtained as a result of experimental studies, and provides an excellent sealing method that can provide long-term stability and high reliability with a simple method for grooved flanges of all shapes. That is, the present invention has a structure in which the protruding height of the embankment of one of the seven flange is made shorter than the depth of the groove of the other seven flange opposite to create a clearance when they are combined, and the solid after hardening is placed in the groove. A composition whose main component is liquid rubber or liquid resin with a water content of 95% or more is poured into a thicker layer than the above-mentioned clearance, and the surface is smoothed by self-flowing.
It relates to a method of vulcanizing or reaction hardening by leaving at room temperature or by adding means such as heating or light, and then sealing the flange having one protrusion by contacting the corresponding groove with pressure.

A more detailed explanation will be given below using the drawings.

FIGS. 2 and 3 are partial sectional views showing the filling and sealing portion of the sealing material according to the present invention, specifically showing the joint portion between the cylinder head of an automobile and its cover. In the figure, 7 indicates a sealing material, and the sealing material 7 in FIG. It shows a state in which it is vulcanized or hardened and changed into an elastic body while adhering to the bottom surface.

In addition, in Fig. 2C), the circular part 3 of one flange is brought into contact with the elastic sealing material 7 in the groove 5, and both parts 757) are tightened with the bolts 6.
F) Indicates that seal 1 is applied to the member that presses the opposing surfaces. As can be seen from Fig. 2C) and Fig. 3, the sealing material 7 is held thicker than the clearance between the circular part 3 and the groove part 5, so that both flanges have a metal touch at the contact surface 8 of the opposing surface. By becoming in a state
It rises in the gap created by the side wall of the circular part 3 and the groove part 5. By doing so, the elastic sealing material 7 receives less surface pressure on its surface and is not directly affected by the rigid mold due to the vibration of the flange, thereby preventing leakage of liquid due to the pumping phenomenon.

The sealing material may be a liquid synthetic rubber, synthetic resin, or a composition made of a combination thereof that becomes elastic after vulcanization or curing, such as silicone rubber (either liquid or two-liquid type), polybutadiene rubber. , thiocol, polyurethane, butyl, acrylic resin (including photocurable and anaerobic curable) compositions, epoxy resins, and the like are suitable sealing materials.

The most notable example of the present invention in which it is possible to prevent pumping phenomena and to use a comb bar is as a part of a cylinder head force/sket cover.

As described above, the present invention provides a sealing method with long-term stability and high reliability.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a flange for explaining a conventional grooved flange sealing method, and FIG. 2(a),
(b) and (C) are partial sectional views of the flange for explaining the sealing method according to the present invention, and FIG. FIG. 1.2...flange, 3...machine part, 5...
・Groove, 7...Sealing material

Claims (1)

[Claims] A continuous annular machine part is protruded from one joint surface, and a cut is made slightly wider and deeper than the protruding width and height of the machine part at a position corresponding to the machine part on the other joint surface. A liquid sealing material that has a solid content of 95% or more remaining after hardening and becomes elastic when hardened is poured into the groove of the grooved flange provided with a groove, and after hardening, the sealing material is A sealing method for a grooved flange characterized by drawing contact and pressing both opposing joint surfaces.