JP2794376B2 - Gas filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates, in general, relates to a gas filter underground type of city gas piping systems, especially those which promote the internal safety supply of builtin gas emergency shut-off valve
Related .

2. Description of the Related Art A conventional manhole-installed gas filter has a gas supply port below an elongated casing, a purging gas outlet opposite to the gas supply port, and a filter cloth element arranged annularly along the inner wall of the casing. The inlet of the purified gas outlet pipe is attached to the center of the pipe in a vertical direction. This conventional structure is shown in FIG. 1, in which screws for fixing and replacing the filter cloth element are mounted above the inlet of the take-out tube. On the other hand, at the time of emergency shutoff, although not shown, an emergency shutoff valve provided in a pipe upstream of the supply port and downstream of the outlet is operated.

[SUMMARY OF THE INVENTION However, to further place the full I le <br/> data and emergency shut-off valve, for emergency shut-off valve
It requires extra space and is inconvenient for maintenance.
You. In addition, piping costs are increased. The object of the present invention is to
Filter installation space and emergency shut-off valve previously required
Space savings, extremely simple structure,
A reliable emergency shut-off valve can be built in, and maintenance can be easily performed at the same time when the filter element is replaced.

According to the present invention, there is provided a gas filter in which the inlet of a purifying gas outlet pipe in a filter housing is vertically upwardly directed, wherein a ball larger than the inlet of the purifying gas outlet pipe and a center of a filter cloth element are provided. A central cavity having a diameter necessary and sufficient to securely adhere to the inlet of the purified gas discharge pipe when the ball is pulled down and provided in the portion ,
And a hoisting machine which raise and lower the ball by the rotation of the operation handle to the filter cloth element central cavity, the winding
The lifter achieves this by being provided at the top within the filter housing .

[Action] In the event of an emergency shutdown, turn the operation handle of the hoist.
Roll the ball to the center of the filter cloth
By pulling the ball down inside,
A ball larger than the mouth easily blocks the inlet of the purge gas outlet.
Go. At this time, the diameter of the center cavity is
Diameter necessary and sufficient to ensure close contact with the inlet of the purge gas outlet pipe
, So that the ball descends easily. Conversely, emergency
To release the disconnection, rotate the operation handle of the hoist
The ball easily in the center of the filter cloth element cavity
Can be Further, the winder is located inside the filter housing.
The size of the conventional filter is
The structure is extremely simple and rigid without changing the structure.
Built-in robust and reliable shut-off valve
At the same time, maintenance can be easily performed at the time of replacement work of the element.

FIG. 2 shows a cross section of an embodiment of the gas filter of the present invention. Reference numeral 1 denotes a gas filter housing, below which there are a supply port 2 for gas to be purified and a purification gas outlet 3. A filter cloth element 4 is provided in an annular shape along the inner wall of the housing, and an inlet 5 of a purified gas outlet pipe is attached to the center of the filter cloth element 4 so as to face upward. The configuration up to this point is exactly the same as that of the conventional type, and is indicated by common numbers in both FIG. 1 and FIG. In the conventional type shown in FIG. 1, a filter cloth element mounting porous bracket 7 is placed at the inlet 5 of the purified gas discharge pipe. In the present invention, the filter cloth element 4 is removed from the casing. The gas was attached from the wall with the holding ring 8 and the gas was prevented from flowing upward with the seal 10, and the upper part of the outlet 5 was a space. Next, similarly to the conventional type in FIG. 1, the filter housing 1 is sealed by the lid 9, but in the present invention,
A ball 13 larger than the purging gas outlet pipe inlet 5; a central cavity having a slightly larger diameter than the 13 diameter of the ball 1 by the rotation of the operation handle 14
3 and a winch for vertically filter cloth element 4 central cavity, the hoisting machine, the upper part of the filter housing 1
It is provided in . The hoist comprises a shaft 11 and a hoist drum 12, and the hoist drum 12 has a wire 1
6, the ball 13 is suspended. Most of the shaft 11, the winding drum 12, the wires 16 and the like are provided in the filter housing. An operation handle 14 is attached to one end of the shaft 11 extending outside the filter housing. The rotation of the handle 14 causes the ball 13 to move up and down the center of the filter cloth element 4 of the winder, and to be brought into close contact with the periphery of the outlet pipe inlet 5 when drawn down (shown by a dotted line). Normally, the ball 13 is wound vertically above the take-out pipe inlet 5, but in an emergency, the ball 13 as a valve body is pulled down by the operation handle 14, and gas is taken out using the periphery of the take-out pipe inlet 5 as a valve seat. Will be shut off. The ball 13 as a valve element is like an iron ball with a rubber lining, and when it is preferable to avoid complete shut-off, the peripheral edge of the outlet pipe inlet 5 serving as a valve seat need not be particularly processed.

According to the gas filter of the present invention , the filter and the emergency shutoff valve are integrated, and the hoist is used as the filter housing.
The filter is installed at the top of the
The space for the emergency shut-off valve, which has been required since then, can be saved . Change
, The size of the conventional filter, without changing the particular structure, since the expression wind the ball, robust and easy very structure, Ru can built reliable shut-off valve. Soshi
Maintenance at the same time as replacing the filter element
It can be easily to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional city gas filter.

FIG. 2 is a sectional view of a city gas filter according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Filter housing 2 ... Gas supply port 3 ... Gas outlet 4 ... Filter cloth element 5 ... Gas outlet pipe inlet 6 ... Gas outlet pipe 9 ... Lid 11 ... Hoisting shaft 12 ... Hoisting drum 13 ... Ball

Claims (1)

(57) [Claims] In a gas filter in which the inlet of a purifying gas outlet pipe in a filter housing is vertically upward, a ball larger than the inlet of the purifying gas outlet pipe and a ball provided at the center of a filter cloth element are pulled. a central cavity having a necessary and sufficient size to securely close contact with the inlet of the purge gas take-out pipe when it was lowered, hoisting raise and lower the ball to the filter cloth element heart cavity by rotation of the operation handle And the winder is provided with the filter casing.
A gas filter provided at an upper part in a body .