JPS6136010Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a gasket for an insulating flange that provides electrical insulation at one point in a conduit for conveying fluids such as water, oil, and various other liquids and gases. It is related to.

When applying electrical heating and electrical corrosion protection to a required part of a pipe, the opposite ends of the required target pipe part and the non-target pipe part are used as flanges, and an insulating flange gasket is installed between the joint end surfaces of the flange parts. It is necessary for efficiency and safety to intervene, electrically insulate, and prevent the dispersion of currents such as heating current and anticorrosion current.

Conventionally, this insulating flange gasket has been constructed as shown in FIG. That is, a collar-shaped body made of asbestos is interposed between almost the entire surface of the joint end surface convex parts 2b, 2b and the joint end face recesses 2c, 2c of the flanges 2, 2 provided at the ends of the opposing pipes 1, 1. 3, and from between the convex portions 2b, 2b of the flange joint end surface of the flange-like body 3 to the thick wall surface 3a of the flange-like body 3 on the inner circumferential side of the tube, there is a coating 4 made of Teflon packing or the like. was formed. With this insulating flange gasket, both flange parts 2, 2, that is, both pipes 1,
1 was said to be insulated.

However, when this gasket is used, it has been pointed out that the insulation deteriorates as follows. In other words, if rust occurs and accumulates on the inner circumferential surfaces 2a and 2a of the tubes in the area around the flange portions, and eventually the two rusts are connected, and when a liquid with good conductivity is sent through the tubes 1, 1, the rust on both flange portions. When tightening 2 and 2 with bolts and nuts, cracks may occur in the coating 4, and the liquid etc. sent in the post pipes 1 and 1 that pass through these cracks seep into the asbestos wing-shaped body 3. In this case, if rust occurs and accumulates in the concave portion 2c of the joint end surface of the flange portion, and eventually comes into contact with the asbestos collar-like body 3, in these four cases, the gasket 3 or its vicinity becomes a conductor, and both flange portions 2 , 2, the insulation between the tubes 1, 1 is eventually deteriorated, and a short circuit may occur, causing problems such as a decrease in the efficiency of electrical heating, electrical corrosion protection, etc.

Therefore, this invention was devised in order to solve the problem in view of the above-mentioned circumstances, and it is a synthetic resin gasket in which the insulation distance and area of the opposing tubes 1 and 1 are made as long and wide as possible. Accordingly, it is an object of the present invention to provide a gasket for an insulating flange that ensures the insulation of both pipes 1, 1.

This invention will be explained below using examples. Second
The figure is a front sectional view of this embodiment.

First, its configuration will be explained.

1, 1 are tubes facing each other, and these two tubes 1, 1
Flange portions 2, 2 are formed at opposing ends of. Reference numeral 5 denotes a synthetic resin cylindrical portion having a length to be inserted into the inner circumferential surfaces 2a, 2a of both tubes in the area near the flange portion, and a central portion of the outer circumferential surface of the cylindrical portion 5 is provided with the flanges of both tubes. joint end surfaces 2b, 2b of
A flanged portion 6 made of synthetic resin interposed between the entire surfaces of 2c and 2c is connected at right angles and formed integrally. That is, the insulating flange gasket according to the invention is constituted by the synthetic resin cylindrical portion 5 and the collar-shaped portion 6, and the cross-sectional shape of the gasket is T-shaped.

The outer diameter of the cylindrical portion 5 is made to match the inner diameter of the tubes 1, 1, or to be slightly shorter. In the latter case,
A ring-shaped packing 7 made of a synthetic resin with high plasticity is inserted into the gap created, or a synthetic resin paint is applied. A normal collar-shaped packing 8 such as an O-ring is inserted into the gap between the collar-shaped portion 6 and the convex portion 2b of the joint end surface of the flange portion.

The best synthetic resin to use is FRP (reinforced plastic), with bisphenol-based epoxy resin for room temperature use and Teflon resin for high temperature use.

The production of the insulating flange gasket according to this invention begins with a cylindrical portion 5 with a wall thickness of 3 to 5 mm and a wall thickness of 8 to 5 mm.
The 10 mm wing-shaped portion 6 is individually manufactured from synthetic resin. Next, the cylindrical part 5 is cut to a required length and then inserted into the wing-shaped part 6 to manufacture the product.

Next, the effect will be explained.

When the cylindrical portion 5 of the insulating flange gasket constructed in this manner is first inserted into the inner circumferential surfaces 2a, 2a of the entire area near the flange portions of opposing pipes, the brim portion 6 is attached to the opposing flanges. It is interposed between almost the entire surface of the joining end surfaces 2b, 2b and 2c, 2c of the parts. Then, the insulating bolts 9 are inserted into holes (not shown) made in the flanges 2, 2 of the tubes and the collar-shaped portion 6 of the gasket, and screwed together with the nuts 10, thereby connecting the flanges of the opposing tubes. The parts 2, 2 are joined together via a gasket.

When the gasket for insulating flanges according to this invention is used in this way, since the insulating distance and area of the opposing pipes 1 and 1 are made as long as possible, both flanges are made of synthetic resin. The insulation of the parts 2, 2, that is, both the tubes 1, 1, becomes very reliable. The problems of gaskets with conventional configurations are solved at once. The details are as follows.

First of all, the inner peripheral surface 2 of the area near the flange part
Since the synthetic resin cylindrical portion 5 of the gasket is inserted into a and 2a, the insulation distance and area of both tubes 1 and 1 are longer and wider, and rust is less likely to occur on these surfaces. Even if rust occurs, it will not accumulate on the surface. Therefore, the two surfaces will not be connected due to rust.

Next, even if a liquid with good conductivity is sent through the tubes 1 and 1, the electrical resistance of the liquid increases because the insulation distance and area of both tubes 1 and 1 are long and wide as described above. However, the conductivity decreases.

Furthermore, when the flanges 2, 2 are tightened with the insulating bolts 9 and nuts 10, cracks occur in the packing 8 due to uneven tightening, etc., and the liquid, etc. sent in the pipes 1, 1 is leaked through the cracks into the gasket. Even if it reaches the wing-shaped portion 6, since this portion is made of synthetic resin, liquid etc. will not penetrate into the inside thereof.

And as, the joint end face recess 2 of the flange part
Even if rust develops and accumulates on the gasket and eventually comes into contact with the wing-shaped portion 6 of the gasket, it will not become a conductor because the portion is made of synthetic resin.

As explained above, the insulating flange gasket according to this invention is constructed by integrating a synthetic resin cylindrical part and a wing-shaped part, so it can be used as a conductor even when used in conduits for conveying various fluids. The insulation of the pipe is very reliable, and the entire area around it does not become a conductor, so there is no possibility of insulation deterioration or
The short circuit condition will be wiped out.

As a result, its mission as a gasket for insulating flanges can be achieved reliably and easily, and the heating current, anti-corrosion current, etc., flow only to the target pipe section and are not dispersed.
The effect of being able to carry out work such as electrical corrosion protection efficiently and safely is truly significant.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a conventional example;
The figure is a front sectional view showing an embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Pipe, 2... Flange part of the pipe, 2a... Inner peripheral surface of the entire flange part of the pipe, 2b... Convex part on the joint end surface of the flange part, 2c... Concave part on the joint end face of the flange part, 3... Conventional gasket for an insulating flange, 3a ...thick side, 4
...Covering, 5. Cylindrical portion of the gasket for insulating flanges according to this invention, 6. Flange-shaped portion of gasket for insulating flanges according to this invention, 7. Ring-shaped packing, 8. Wing-shaped packing, 9. Insulating bolt, 10. ...Natsuto.

Claims (1)

[Scope of utility model registration request] A cylindrical portion 5 made of synthetic resin is inserted into the inner circumferential surfaces 2a, 2a in the vicinity of the flange portions 2, 2 formed at the ends of the opposing tubes 1, 1, and a cylindrical portion 5 made of synthetic resin is inserted into the inner circumferential surfaces 2a, 2a of the entire area around the flanges 2, 2 formed at the ends of the opposing tubes 1, 1. An insulating flange characterized by comprising a flanged portion 6 made of synthetic resin that is connected and integrally formed and is interposed between substantially the entire surface of the joint end surfaces 2b, 2b and 2c, 2c of the opposing flange portions 2, 2. Gasket for.