JPH0257201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flange leakage gas purging method that prevents in-machine gas from leaking from a flange portion of a casing to the outside of the machine.

When handling hazardous gases in turbo compressors, blowers, fans, etc., it is necessary to prevent gas inside the machine from leaking to the outside of the machine. The structure of the casing part of the above-mentioned equipment will be explained with reference to FIG. 1. Horizontal flanges 3 and 4 are integrally fixed to the lower part of the upper casing 1 and the upper part of the lower casing 2, respectively. 3 and 4 are strongly tightened at their contact surfaces with bolts and nuts, so that the internal gas within the casings 1 and 2 does not leak to the outside of the machine. However, for some reason, the tightening force may become loose, or the upper and lower flanges 3 and 4 may become loose.
If the gas is deformed, the gas inside the machine easily leaks to the outside of the machine, which is inconvenient in the conventional type.

The present invention has been made in view of the above-mentioned points of view, with the object of preventing the in-machine gas from leaking to the outside of the machine from the flange contact surface of the casing.

The present invention provides a purge groove that extends continuously around the entire circumference in the longitudinal direction of the flange, which is provided on the flange contact surface of the casing so as to divide the corresponding surface into inside and outside of the machine.
In addition to completely collecting the gas leaking from the in-machine contact surface of the casing flange into the purge groove,
A purge chamber extending in the circumferential direction formed in the shaft penetration part of the casing completely collects the gas leaked from the shaft penetration part into the purge chamber, and the gas collected in the purge groove of the flange is transferred to the casing flange. After guiding the gas to the purge chamber without leaking to the outside from the contact surface on the outside of the machine, the gas collected in the purge chamber is discharged from the purge chamber to a safety zone outside the machine, and the gas is discharged from the purge chamber of the shaft penetrating part to the outside of the machine. A flange leakage gas purge characterized by supplying inert gas at a pressure higher than the pressure of in-machine gas to an inert gas blowing chamber extending in the circumferential direction of the shaft provided in the flange to prevent gas leakage from the shaft penetration part. It is related to the method. Therefore, in-machine gas can be prevented from leaking to the outside of the machine from the flange surface and the shaft penetrating portion.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Horizontal flanges 3 and 4 are integrally fixed to the lower part of the upper casing 1 and the upper part of the lower casing 2, which are divided into two vertically, respectively, and the contact surface of the upper surface of the horizontal flange 4 with the lower surface of the horizontal flange 3 is attached as shown in FIG. As shown in the plan view, a purge groove 5 is provided so as to be located approximately in the center of the horizontal flange 4 in the width direction. A purge groove 6 is provided by notching the contact surface at the end of the horizontal flange 3, and a bolt hole 7 is provided in the horizontal flange 3 through which a bolt 9 is inserted, as shown in FIG. A tap 8 is provided so that the horizontal flanges 3 and 4 can be firmly fastened with bolts 9.

Seal boxes 10 and 11 in the shape of two halves of a ring are fitted into the shaft 30 penetrating portions of the casing that are connected to the ends of the horizontal flanges 3 and 4, and the seal boxes 11 and 11 are fitted with a ring on the abutment surface against the seal box 10. As shown in FIG. 2, a purge groove 12 communicating with the grooves 5 and 6 is provided, and the groove 12 is communicated with a purge chamber 13 formed by seal boxes 10 and 11. A pressure equalizing chamber 14 located on the inside of the machine and an inert gas blowing chamber 15 located on the outside of the machine are provided with the chamber 13 in between.

Labyrinth packings 16, 17, 18, 19 are disposed between the seal boxes 10, 11 and the shaft 30, respectively, and holes 20, 21, which penetrate the seal box 10 in the radial direction as shown in FIG.
22 is provided, the hole 20 is connected to the purge chamber 13, and the hole 21 is connected to the purge chamber 13.
into the pressure equalization chamber 14 and the hole 22 into the inert gas blowing chamber 15.
and a hole 20 in the upper casing 1.
The hole 23 communicating with the hole 23, the hole 24 communicating with the hole 21, and the hole 25 communicating with the hole 22 are made to communicate with each other, and the left and right holes 24, 24 are connected by a pressure equalizing pipe 27, and the left and right holes 2
3 and 23 are connected to a vent pipe 26, and a pipe line 28 for blowing inert gas such as N ₂ gas into the inert gas blowing chamber 15 is connected to the left and right holes 25.
The pipe line 28 is provided with a pressure control valve 29 for detecting the pressure of the gas inside the machine and controlling the pressure inside the inert gas blowing chamber 15 to be slightly higher than the pressure inside the machine.

When the pressure of the gas inside the machine increases and it starts to leak, the gas first starts to leak from the contact surface between the horizontal flanges 3 and 4 on the inside of the machine, but the gas leaking between the horizontal flanges 3 and 4 flows into the groove 5 in the center. , enters the groove 12 of the seal box 11 through the groove 6, and enters the groove 12 of the seal box 11.
It enters the purge chamber 13 provided in the seal boxes 10 and 11 from the purge chamber 13 and enters the holes 20 and 23 from the purge chamber 13.
It is then discharged from the vent pipe 26 to a safe zone.
Therefore, gas does not leak to the outside from the contact surfaces of the horizontal flanges 3 and 4 on the outside of the machine, resulting in extremely high safety.

Furthermore, seal boxes 10 and 11 are provided at the portions where the shaft 30 passes through the upper and lower casings 1 and 2.
A plurality of labyrinth packings 16, 17, 18, 19 are installed between the seal boxes 10, 11 and the shaft 30, and the seal boxes 10, 11
In the inert gas blowing chamber 15 provided at the outer end of the
Since inert gas with a pressure slightly higher than the in-machine gas pressure is supplied, the in-machine gas and the gas led to the purge chamber 13 through the grooves 5, 6, and 12 pass through the inert gas blowing chamber 15 and exit the machine. There will be no leakage.

In addition, in the embodiment of the present invention, a case will be described in which gas leaking from the inboard contact surface of the horizontal flange is guided from the purge groove to the purge chamber of the seal box, and is discharged from the purge chamber to the safety zone via the vent pipe. However, it is also possible to connect a purge line that communicates with a purge groove to a predetermined position of the horizontal flange, and to discharge gas from the purge line to an external safety zone. It is possible to provide the purge grooves on the surface or the contact surfaces of the upper and lower casings, to provide a plurality of purging grooves on one flange, and to make other changes without departing from the gist of the present invention. Of course.

According to the flange leakage gas purging method of the present invention, in-machine gas is guided through the purge groove to the purge chamber formed in the shaft penetration part without leaking to the outside from the contact surface of the horizontal flange, and leaks from the shaft penetration part. Since the in-flight gas is discharged from the purge chamber to the safe area outside the machine, it is possible to safely prevent the in-flight gas from leaking to the outside of the machine from the horizontal flange contact surface. Leakage from the interior to the outside of the aircraft can be safely prevented by inert gas supplied at a pressure higher than the pressure of the cabin gas.
Therefore, an excellent effect of improving safety can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the horizontal flange portion of a conventional casing, FIG. 2 is an explanatory plan view of the horizontal flange portion provided on the lower casing used in the flange leakage gas purging method of the present invention, and FIG. Fig. 2 is a -direction arrow view, Fig. 4 is - of Fig. 2.
The directional view and FIG. 5 are longitudinal cross-sectional views for explaining the portion of the seal box used in the flange leakage gas purging method of the present invention. In the figure, 1 is an upper casing, 2 is a lower casing, 3, 4 are horizontal flanges, 5, 6, 12 are sealing grooves, 13 is a purge chamber, and 26 is a vent pipe.

Claims (1)

[Claims] 1. A purge groove that extends continuously around the entire circumference in the longitudinal direction of the flange, which is provided to divide the corresponding surface into the inside and outside of the casing on the flange contact surface of the casing. At the same time, the purge chamber extending in the circumferential direction formed in the shaft penetrating portion of the casing completely collects the gas leaking from the shaft penetrating portion into the purge chamber, and purges the flange. After the gas collected in the groove is guided to the purge chamber without leaking to the outside from the contact surface of the casing flange on the outside of the machine, the gas collected in the purge chamber is discharged from the purge chamber to a safety zone outside the machine. , and leaking gas from the shaft penetrating portion by supplying inert gas at a pressure higher than the pressure of the in-machine gas to an inert gas blowing chamber extending in the circumferential direction of the shaft provided outside the machine from the purge chamber of the shaft penetrating portion. A flange leakage gas purging method characterized by preventing.