JPS5828463B2 - loose lunge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loose flange which allows relative axial movement of interconnected connecting tubes and which is fitted with a molded fitting which can be pressed into the connecting part and which can be adjusted.

FIG. 1 is an explanatory diagram showing a loose flange according to a conventional example.

At the end of the first connecting pipe 1, a fixing flange 2 projecting in a ring shape is provided with a packing 3 on the joint surface and is integrated with a fixing bolt 4.

The end of the second connecting pipe 5 is inserted into the inside of the fixed 7 flange 2, and the end face of the first connecting pipe 1 and the second connecting pipe 5 are connected to each other so that the first connecting pipe 1 and the second connecting pipe 5 can move relative to each other in the axial direction. A gap is provided between the second connecting pipe 5 and the inner circumferential surface of the fixed 7 flange 2 and the second connecting pipe 5.
A gap is also provided between the connecting tube 5 and the outer circumferential surface of the end thereof.

Furthermore, in order to prevent pressure water from flowing out through this gap, a molded packing 6 is provided between the inner circumferential surface of the fixed 7 flange 2 and the outer circumferential surface of the second connecting pipe 5. 6 can be adjusted by pushing in the gland 7 with an adjustment bolt 8.

That is, the first connecting pipe 1 button and the second connecting pipe 5 can be relatively moved in the axial direction by expansion and contraction due to temperature differences throughout the year and expansion and contraction due to water pressure.

During this relative movement, the molded packing 6 causes its inner circumferential water sealing surface and outer circumferential water sealing surface to come into sliding contact with the second connecting pipe 5 and the fixed 7 flange 2, causing wear.

Depending on the degree of wear on the molded packing 6, it is possible to suppress water leakage due to wear by adjusting the gland 1 by pushing it.

However, when such a loose flange is used for a long period of time, it is difficult to prevent water leakage 9 by simply pushing the molded packing 6.
There is a problem in that the leakage water 9 drips into the surrounding area, causing staining of the surrounding area and failure of peripheral equipment.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a loose flange that does not allow water to leak to the surrounding area.

The present invention provides a fixing 7 provided at one end of the connecting pipe.
In a loose 7 lange in which a molded packing that can be pressed and adjusted by a gland is installed between the inner surface of the flange and the outer surface of the other end of the connecting pipe, the inner peripheral water sealing surface of the molded packing is attached to at least one of the fixed flange or the gland. Also, a drainage chamber and a drainage channel are provided which communicate with the outer water sealing surface.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 2 and 3 are explanatory diagrams showing an embodiment of the loose 7 lunge according to the present invention.

Water pipe 11 that leads pressure water from the upper dam in a hydroelectric power plant
An inlet valve 12 for blocking or passing water is connected to the end of the water wheel.

The large mouth valve 12 is connected to the water turbine casing 14 via a connecting pipe 13.

A loose flange 20 is installed between the connecting pipe 13 and the turbine casing 14 to absorb the expansion and contraction of the piping system caused by temperature differences throughout the year and the expansion and contraction of the piping system caused by water pressure generated when the large mouth valve 12 is opened and closed. There is.

The loose 7 lunge 20 is constructed as shown in FIG.

That is, at the end of the water turbine casing 14, a fixing flange 22 that protrudes in a ring shape through a packing 21 is attached to the bolt 2.
3, a molded packing 24 is inserted between the inner peripheral surface of the fixed 7 flange 22 and the outer peripheral surface of the connecting pipe 13, and the molded packing 24 pushes the gland 25 into the fixed 7 flange 22 with a bolt 26. This maintains the water sealing function.

The gland 25 is fitted onto the outer periphery of the connecting tube 13, and its end inner circumferential surface is connected to the end inner surface of the fixed 7 flange 22 via a packing 27 in a spigot.

A shim 28 is inserted between the fixed flange 22 and the gland 25, and by removing the shim 28, the bolt 26 can be tightened.

An auxiliary gland 29 is attached to the outside of the gland 25.
0 is held and fixed by the bolt 31, and the packing 30
This completes the water seal between the ground 25 and the connecting pipe 13.

A drainage chamber 32 that communicates with the inner circumferential water sealing surface of the molded packing 24 is formed in the portion of the gland 25 that is fitted into the connecting pipe 13, and a drainage chamber 32 that communicates with the inner peripheral water sealing surface of the molded packing 24 is formed in the opposing gap between the gland 25 and the fixed flange 22. A drainage chamber 33 is formed that communicates with the outer water sealing surface, and the drainage chambers 32 and 33 communicate with a drainage channel 34 provided inside the gland 25.
4 is designed to lead leakage water 36 to the outside via a drain pipe 35.

According to the loose 7 flange 20 according to the above embodiment, the molded packing 24 is worn out due to relative movement between the connecting pipe 13 and the water turbine casing 14, and some water leakage 36 occurs on the inner circumferential water sealing surface and the outer circumferential water sealing surface of the forming packing 24. If this occurs, shim 2
By removing the bolt 8 and tightening the bolt 26, the molded packing 24 can be pushed in through the gland 25, and water leakage 36 can be reduced.

Additionally, if the molded gasket 24 is further worn out due to long-term use and leakage 36 occurs, the leakage 36 will be led out through the drain chambers 32, 33, the drain channel 34, and the drain pipe 35, and the loose 7 langes 20 will be led out. The leakage water 36 will not drip into the surrounding area.

FIG. 4 is an explanatory diagram showing a second embodiment of the loose flange according to the present invention.

This loose flange 20A is different from the button loose flange 20 of the previous embodiment in that it connects the inner circumferential surface of the fixed 7 flange 22A and the outer circumferential surface of the gland 25 with a spigot, and also connects the drain channel 34A of the drain chamber 32 to the gland 25A. The main difference is that the drainage channel 34B of the drainage chamber 33 is formed in the fixed flange 22A, and the other parts are formed in the same manner as in the previous embodiment, and the molded gasket 24 is formed in the same manner as in the previous embodiment. Water leakage from the inner circumferential water sealing surface and the outer circumferential water sealing surface can be drained without dripping to the outside.

As described above, the present invention provides a loose 7 in which a molded packing that can be pressed and adjusted by a gland is attached between the inner surface of a fixed flange provided at one end of the connection pipe and the outer surface of the other end of the connection pipe. In the lunge, at least one of the fixed seven runci and the gland is provided with a drainage chamber and a drainage channel that communicate with the inner and outer water sealing surfaces of the molded packing, so that water leakage from the molded packing is drained to the outside. It has the effect of not dripping.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional loose flange, Fig. 2 is a partial sectional view showing a piping system to which an embodiment of the loose flange according to the present invention is applied, and Fig. 3 is a sectional view of the same loose flange. A sectional view showing one embodiment, and FIG. 4 is a sectional view showing another embodiment of the same loose flange. 20.20A...loose flange, 22.22A...
・Fixed flange, 24... Molded packing, 25° 25
A...Ground, 32.33...Drainage room, 34゜3
4A, 34B... Drainage channel.

Claims (1)

[Claims] 1. In a loose 7 lange in which a molded packing that can be pressed and adjusted by a gland is attached between the inner surface of a fixed flange provided at one end of the connecting pipe and the outer surface of the other end of the connecting pipe, the fixed flange or A loose flange characterized in that at least one of the glands is provided with a drainage chamber and a drainage channel that communicate with an inner circumferential water sealing surface button and an outer circumferential water sealing surface of the molded packing.