JP5092854B2 - Gas filter, gas cylinder manufacturing method using the same, and gas insulated switchgear manufacturing method - Google Patents

Description

  The present invention relates to a gas filter for injecting clean gas into a sealed container provided in a gas insulated switchgear, for example, a method for manufacturing a gas-filled sealed container manufactured using the same, and a gas insulated switchgear About.

  An airtight container provided in the gas insulated switchgear is filled with an insulating gas having high insulation properties such as SF6 gas. However, if a foreign substance is mixed in the sealed container, the possibility of dielectric breakdown due to the mixed foreign substance increases, so it is desirable to prevent foreign substances from being mixed during gas filling. Filling the insulating gas is performed while attaching a gas filter to a pipe connected to the inside of the sealed container, sending the insulating gas compressed to a high pressure by a pump or the like into the gas filter, and removing foreign matters in the gas (for example, Patent Document 1). The conventional gas filter is composed of a filter body made of a porous membrane, a porous structure or the like, and a cylindrical housing for fixing and supporting the filter body. Many of the housings have a shape that can be connected to the periphery of an opening such as a gas pipe (for example, Patent Document 2).

JP 2000-134735 A (paragraph 0006) Japanese Patent Laid-Open No. 5-31312 (paragraph 0006)

  When a conventional gas filter is attached in the middle of the gas pipe, the flow velocity is reduced due to the blocking by the filter regardless of the direction of the gas flow flowing in the pipe. In addition, when a conventional gas filter is attached in the middle of a gas pipe connected to the sealed container to perform gas filling, the flow rate is also reduced in the exhaust (not requiring filtration) in the sealed container performed before gas filling. Since it falls, it has the subject that the working time required for gas filling becomes long.

  The present invention has been made to solve the above-described problems. By obtaining a gas filter that hardly reduces the flow rate of a gas flow flowing in a specific direction, the work time required for gas filling can be reduced. The purpose is to shorten.

Gas filter according to the present invention, first, it has a second opening, a tubular housing provided with a recess in the periphery of the second opening, accommodated in the inner space of the housing, the first A filtration surface that opposes the opening and a filtration back surface that opposes the second opening, and when gas flows in from the first opening, the filtration back surface is fitted into the recess, and the second When gas flows in from the opening, the filter body that is pushed by the gas flow toward the second opening so as to separate the depression and the back surface of the filter, and guidance that induces the advancement and retraction of the filter body Means, and when the gas does not flow into the gas filter, the depression and the filter body are separated from each other.

The gas filter of the present invention configured as described above includes a filter body that advances and retreats toward the second opening, and when the gas does not flow into the gas filter, the recess and the filter body are arranged apart from each other. Thus, when the gas flows in from the second opening of the housing, the gas flows from the periphery of the filter body, the effect of the shielding by the filter body is alleviated, and a gas filter in which the flow rate does not decrease can be obtained. can get.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the structure of the gas filter of the present invention. FIG. 2 is a cross-sectional view showing the structure of the gas filter of the present invention. In FIG. 1 or FIG. 2, the same reference numerals are assigned to the same or corresponding parts.

  As shown in FIG. 1, the gas filter 100 of the present invention accommodates a filter body 20 made of porous sintered resin having a pore diameter of 200 μm in an internal space 11 of a cylindrical housing 10 made of brass forging material so as to be able to advance and retreat. It is a thing. One end of the cylindrical housing 10 is provided with a first flow path 12a having a first opening 12, and the other end is provided with a second flow path 13a having a second opening 13, respectively. An internal space 11 is provided between the two. The gas flowing in from one end side of these openings flows through the space 11 to the other end side. In the predetermined position 14 of the space 11, for example, a recess 14 a shaped to fit the filtration back surface 20 a of the filter body 20 is provided at a predetermined position (around the second opening) of the housing 10. The filter body 20 can be positioned and arranged at the position 14. The space 11 is provided with a support bar 15 for guiding the filter body 20 to the predetermined position 14, and the support bar 15 is supported by the housing 10. FIG. 2 is a cross-sectional view of the gas filter 100 at a portion corresponding to the one-dot chain line A-A ′ in FIG. 1. The support rod 15 penetrates the filter body 20 to indirectly support the filter body 20 on the housing 10. In the first embodiment, as shown in FIG. 1, an elastic body 16 such as a spring is passed through the support bar 15, and the filter body 20 and the housing 10 are connected by the elastic body 16. By providing the separating means for disposing the 20 stationary positions away from the predetermined position 14, the risk of the filter body 20 and the recess 14 a of the housing 10 being inadvertently condensed and closely contacting is prevented. However, using the elastic body 16 to separate the stationary position of the filter body 20 from the predetermined position 14 is not always necessary when used in an environment where the influence of dew condensation is not a concern.

  When gas flows in from the first opening 12, the filter body 20 is pressed by the gas flow (wind pressure of the gas flow) and moved to a predetermined position 14 (around the second opening) while being guided by the support rod 15. The filtration back surface 20a is positioned and arranged in the recess 14a. Therefore, all of the gas flowing in from the first opening 12 is passed through the filter body 20, and foreign substances 30 (not shown) having a particle size of 200 μm or more in the gas are removed by the filter body 20 and are clean. The gas flows out from the second opening 13. Needless to say, the foreign matter 30 removed from the gas is accumulated and held on the filtration surface 20b of the filter body 20 (the surface opposite to the filtration back surface 20a).

  On the other hand, when the gas flows in from the second opening 13, the filter body 20 is pressed by the wind pressure of the gas flow, and is guided by the support rod 15 to leave the predetermined position 14. A gap is generated between the filter back surface 20a and the windage loss is reduced while gradually widening the gap (reducing pressure loss). The inflowing gas does not pass through the filter body 20 having a large windage loss, and passes through the space 11 on the downstream side from the periphery of the surface of the filter body 20 with a low windage loss (opened gap) and from the first opening 12. leak. Since the gas flowing through the gas filter 100 at this time flows through a portion having a small windage loss that is not hindered by the filter body 20, the flow rate is hardly reduced.

  Further, the flow velocity of the gas flowing on the surface of the filter body 20 is higher on the upstream filtration back surface 20a than on the leeward filtration surface 20b, and therefore the surface of the filtration back surface 20b becomes negative pressure and turbulence is generated. The extraneous matter 30 accumulated and held on the filtration surface 20b by this turbulent flow is separated from the filtration surface 20b and washed away to the first opening side, that is, the flushing of the filter body 20 is achieved. Is obtained. As a matter of course, since most of the gas flowing in from the second opening does not ventilate the filter body 20, the foreign substances 30 in the gas are not accumulated and held on the filtration back surface 20a. It flows as it is to the first opening.

Embodiment 2. FIG.
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. FIG. 3 is a longitudinal sectional view showing the structure of the gas filter of the present invention. FIG. 4 is a perspective view of a guide ring with a slit used in the gas filter of the present invention. 3 and FIG. 4, the same reference numerals are given to the same or corresponding parts as in FIG. 1 or FIG.

  As shown in FIG. 3, the gas filter 101 according to the second embodiment of the present invention is a guide with a slit instead of the support rod 15 (and the elastic body 16) as compared with the gas filter 100 according to the first embodiment. The only difference from the gas filter of the first embodiment is that the ring 17 is provided in the internal space 11 of the housing 10.

  In the gas filter 101 according to the second embodiment of the present invention configured as described above, the guide ring 17 is housed and disposed leaving the space S between the inner wall surface of the housing 10 and the outer wall surface of the guide ring 17. The inside of the guide ring 17 and the space S are in communication with each other through the slit 17 a of the guide ring 17. The filter body 20 is housed inside the guide ring 17.

  The gas flowing in from the first opening 12 presses the filter body 20 by the wind pressure of the gas flow, and moves the filter body 20 to a predetermined position 14 as in the gas filter 100 of the first embodiment. The filtration back surface 20a is positioned and arranged. As a result, all of the inflowing gas passes through the filter body 20 and flows out from the second opening 13 as a clean gas. Also, in the gas flowing in from the second opening 13, the filter body 20 is pressed by the wind pressure of the gas flow, and a gap is generated between the recess and the filtration back surface 20a. As a result, similarly to the gas filter 100 of the first embodiment, the inflowing gas flows from the gap around the filter body 20 through the slit 17a of the guide ring 17, and further passes through the space 11 on the downstream side to form the first gas. It flows out from the opening 12. Therefore, since the gas flows around the filter body 20 with little windage loss, the gas flow rate hardly decreases. Moreover, the effect that the flushing of the filter body 20 is achieved similarly to the gas filter 100 of Embodiment 1 is also acquired. As described above, the gas filter 101 according to the second embodiment has substantially the same effect as the gas filter 100 according to the first embodiment. However, since the number of parts such as supporting rods to be used is small and it is easy to install, the filter assembly time is as follows. It is more effective in reducing energy consumption.

  The filter body 20 used in the first and second embodiments of the present invention is a filter body made of a porous sintered resin having a pore diameter of 200 μm, but the material is any material such as fluororesin, polypropylene, or ceramics. The hole diameter may be in the range of 0.1 μm to 3 mm, and the same effect as that obtained in the embodiment of the present invention can be obtained. Furthermore, the filter does not necessarily need to remove foreign matters such as particles, and may be one that adsorbs and filters impurity gas or the like. In that case, the apparent amount of adsorption filtration of the impurity gas is increased, and the effect that the service life of the filter body can be increased can be obtained. Further, the housing is not necessarily made of brass forging material, and any material may be used, and the same effect as that obtained in the embodiment of the present invention can be obtained. In addition, although the guide ring 17 used in the second embodiment is provided with a slit, the present invention can be implemented even with an opening that allows the inside of the guide ring 17 and the space S to communicate with each other instead of the slit. It is obvious that the same effect as that obtained in the form can be obtained.

Embodiment 3 FIG.
Hereinafter, the third embodiment of the present invention will be described in detail with reference to the drawings. FIG. 5 is a schematic configuration diagram of a gas sealing apparatus using the gas filter of the present invention. 5 that are the same as or equivalent to those in FIG. 1 or 2 are assigned the same reference numerals.

  As shown in the schematic configuration diagram of FIG. 5, the gas sealing apparatus 1000 using the gas filter of the present invention includes a second opening 13 of the gas filter 100 of the present invention and a sealed container 200 provided in the insulating switchgear 1100. Are connected by a first pipe 350 having a first valve 300 in the middle, and the other first opening 12 and the pump 400 are connected by a second pipe 550 having a second valve 500 in the middle. . The above-mentioned pump 400 is a pump capable of both pressure reduction to near vacuum and gas pressurization such as SF6 gas up to several hundred atmospheres, and in particular, any pump can pressurize and send any gas. is there. If it is difficult to arrange a pump as described above, the same device performance can be obtained by using a pump that can be depressurized or pressurized instead of the pump 400, or using a vacuum cylinder or a high-pressure gas cylinder. It is possible to obtain a gas sealing device having an effect.

  The manufacturing procedure of the gas insulated switchgear 1100 that fills the sealed container 200 of the gas insulated switchgear with SF6 gas will be described below. After opening the first valve 300 and the second valve 500, the pump 400 is operated in a vacuum and evacuated (ST1). The air in the sealed container 200 is exhausted from the pump 400 via the first pipe 350, the gas filter 100, and the second pipe 550. At this time, since the inlet of the air flowing into the gas filter 100 is the second opening 13, the filter body 20 of the gas filter 100 is pushed away from the predetermined position 14 by the wind pressure. Therefore, both the air exhausted from the hermetic container 200 and the foreign matters contained in the air are not filtered from the periphery of the surface of the filter body 20 of the gas filter 100 and go to the first opening 12 through the downstream space 11. And is exhausted from the pump 400. Therefore, the air containing the foreign matter in the sealed container 200 is quickly exhausted. At the same time, it is clear that the foreign matter present on the filtration surface 20b of the gas filter 100 is washed away.

  When the exhaust is finished, first, the second valve 500 is closed. Next, the pump 400 is stopped, and SF6 gas is supplied into the tank in the pump 400 to bring it to atmospheric pressure. After reaching the atmospheric pressure, the pressurization operation of the pump 400 is started and the second valve 500 is opened to supply SF6 gas into the sealed container 200 under pressure (ST2). SF6 gas is pressurized and filled into the sealed container 200 via the pump 400, the second pipe 550, the gas filter 100, and the first pipe 350. At this time, since the inlet of SF6 gas flowing into the gas filter 100 is the first opening 12, the filter body 20 of the gas filter 100 is pushed by the wind pressure and moves to a predetermined position 14. Therefore, both the high-pressure SF6 gas supplied from the pump 400 and the foreign substances contained therein pass through the filter body 20 of the gas filter 100, and the foreign substances 30 having a particle size of 200 μm or more are filtered and removed to obtain a clean gas. Then, the sealed container 200 is pressurized and filled through the second opening 13.

  When the filling is completed, the first valve 300 is closed, the pressurization operation of the pump 400 is stopped (ST3), and then the gas filter 100 is removed from the first pipe 350. This completes the filling of the sealed container 200 with the SF6 gas.

  In the third embodiment of the present invention described above, the manufacturing method of the gas insulated switchgear that fills the sealed container 200 of the gas insulated switchgear with the SF6 gas has been described. However, the sealed container intended for gas filling is the gas insulated switchgear. There is no need to be limited, and for example, a gas cylinder that performs gas filling may be used, or gas may be filled into a sealed container or tank of any other device. On the other hand, the gas to be filled is not necessarily limited to SF6 gas, and any gas may be used, and it is obvious that the same effect as that obtained in the embodiment of the present invention can be obtained.

It is a longitudinal cross-sectional view of the gas filter of Embodiment 1. It is a cross-sectional view of the gas filter of Embodiment 1. It is a longitudinal cross-sectional view of the gas filter of Embodiment 2. It is a perspective view of the guide ring with a slit of Embodiment 2. FIG. It is a schematic block diagram of the gas sealing apparatus of Embodiment 3.

Explanation of symbols

10 Housing 11 Internal space
12 1st opening 13 2nd opening
14 Predetermined position 20 Filter body 100 Gas filter 200 Airtight container
1100 Insulated switchgear

Claims (4)

First, have a second opening, said second cylindrical housing having a recess in the periphery of the opening,
When the gas flows in from the first opening, the hollow is housed in the internal space of the housing and has a filtration surface facing the first opening and a filtration back surface facing the second opening. When the back surface of the filter is fitted and gas flows in from the second opening, the gas flow is pushed toward the second opening so as to move away from the recess and the back surface of the filtration. A filter body ;
Guiding means for guiding advancement and retraction of the filter body;
With
The gas filter, wherein when the gas does not flow into the gas filter, the depression and the filter body are arranged apart from each other . The gas filter according to claim 1, further comprising a separating unit that separates the recess from the filter body . A gas cylinder manufacturing method in which a gas is filled in a sealed container having a pipe communicating with the inside of the container and an open / close valve for restricting a flow path of the pipe, and the gas according to claim 1 or 2 in the pipe. Connecting a second opening of the filter; extracting a gas in the sealed container from the first opening of the gas filter; and injecting the gas into the sealed container from the first opening of the gas filter A method for manufacturing a gas cylinder, comprising: a step; a step of closing the on-off valve; and a step of removing the gas filter from the pipe. A gas insulating switchgear having a sealed container having a pipe communicating with the inside of the container and an open / close valve for restricting a flow path of the pipe, wherein the gas according to claim 1 or 2 is provided in the pipe. Connecting a second opening of the filter; extracting a gas in the sealed container from the first opening of the gas filter; and injecting the gas into the sealed container from the first opening of the gas filter A method for manufacturing a gas insulated switchgear comprising the steps of: closing the open / close valve; and removing the gas filter from the pipe.

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