JP2011060709A - Gas recovery device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas recovery device suitable for recovery of insulating gas from a small switch gear especially in a power distribution substation. <P>SOLUTION: The device body 10 of a gas recovery device 1 has a vacuum pump and a main piping portion 20 having a suction side passage 21, an exhaust side passage 22, and a bypass passage 23 formed integrally, and a frame 13 including a handle portion 13C for carrying is attached. With this structure, an operator can carry the vacuum pump and the necessary piping at one time by lifting the device body 10 using the handle portion 13C. Thus, the gas recovery device 1 is superior in portability and workability, and enables the operator to perform gas recovery easily at the installation site of an LDS 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gas recovery apparatus.

SF ₆ gas is filled as an insulating gas inside the breaker of a load disconnector (LDS) often used in outdoor switchgear of distribution substations. However, it has recently been pointed out that SF ₆ gas has a very high greenhouse effect, and since it has a long life until decomposition, it has been designated as an emission control target. For this reason, it is necessary to reliably collect the SF ₆ gas without leaking it into the atmosphere during the LDS deterioration replacement work.

JP 2001-143580 A

However, the warming effect of SF ₆ gas has recently been regarded as a problem, and it was not envisaged at the time when the existing LDS was installed, and it was enclosed in a small LDS. Since the amount of gas generated is very small and it is not necessary to replace the internal gas until the deterioration replacement, the actual situation is that the response to the gas recovery from the LDS is delayed. For large insulated switchgear (GIS) and gas circuit breaker (GCB), it is necessary to vent the internal gas at the time of repair / inspection. However, a gas recovery apparatus suitable for gas recovery from LDS with a very small amount of gas filling has not been developed so far. For these reasons, there is no other way to request the collection of LDS by bringing a shut-off unit into the manufacturer's factory, and much labor and cost are required.
The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a gas recovery apparatus suitable for recovering insulating gas from a small switchgear in a distribution substation. .

  As means for solving the above problems, the gas recovery apparatus of the present invention is a gas recovery apparatus for recovering an insulating gas sealed in a switching facility of a distribution substation, comprising a vacuum pump, An intake-side flow path connected to the intake port of the vacuum pump, an exhaust-side flow path connected to the exhaust port of the vacuum pump, and a bypass between the intake-side flow path and the exhaust-side flow path A main body having a bypass flow path to be connected, a handle body for carrying the vacuum pump integrally, a recovery container for storing the insulating gas, and the switching device And a connecting pipe section that connects between the intake-side flow path and between the exhaust-side flow path and the recovery container.

  The gas recovery apparatus of the present invention is excellent in portability and workability, and is suitable for recovering insulating gas from a small switching facility in a distribution substation.

Overall view of gas recovery device in this embodiment Front view of the main unit Right side view of the main unit Left side view of the main unit Top view of the device body Rear view of the main unit Bottom view of the device body Partial enlarged view showing a connection portion between the LDS and the device side hose Sectional view of the first coupler Partial enlarged view showing the connection part between the device side hose and the device body Sectional view of the second coupler Partial enlarged view showing a connection portion between the apparatus main body and the collection side hose Sectional view of the third coupler

  Hereinafter, an embodiment in which the gas recovery apparatus of the present invention is embodied will be described in detail with reference to FIGS.

The gas recovery apparatus 1 of the present invention is particularly suitable for recovering a small amount of SF ₆ gas enclosed in the shut-off portion of the LDS 50. The apparatus main body 10 for recovering SF ₆ gas and the recovered gas are used. A collection container 38 for storing, a device-side hose 31 that connects the apparatus main body 10 and the gas supply port 51 of the LDS 50, and a collection-side hose 35 that connects the apparatus main body 10 and the collection container 38 are provided.

  The apparatus main body 10 includes a small vacuum pump 11 for sucking gas. Although the thing of a general structure can be used as the vacuum pump 11, when portability is considered, it is preferable that it is small and lightweight so that an operator can carry it alone. A base plate 12 and a pair of left and right frames 13 are attached to the vacuum pump 11. The base plate 12 is formed in a rectangular plate shape from stainless steel, for example, and is fixed to the lower surface side of the vacuum pump 11 with screws.

  Each of the pair of frames 13 is formed by bending a round bar formed of a metal such as stainless steel, and has a leg portion 13A disposed on the lower surface side of the base plate 12 and extends from the leg portion 13A. It is comprised from the piping attachment part 13B extended along the front surface of the vacuum pump 11, and the handle part 13C extended from the upper end part of the piping attachment part 13B. The pair of leg portions 13 </ b> A are disposed over the entire length of the left and right side edge portions on the lower surface side of the base plate 12, and are fixed to the base plate 12 by welding. The pair of pipe mounting portions 13B extend from the front end of the leg portion 13A so as to incline toward the center (in the direction of approaching each other) as they go upward, and are aligned with each other at a position slightly lower than the upper end position of the vacuum pump 11. Further, it extends upward to a position exceeding the upper end position of the vacuum pump 11. The handle portion 13C extends horizontally from the upper end of the pipe mounting portion 13B toward the rear, and the operator can carry the apparatus main body 10 by grasping and pulling up the handle portion 13C.

  A main piping portion 20 is formed by a pipe on the front surface of the vacuum pump 11. The pipe material is preferably one that is not easily corroded by the gas to be collected, such as stainless steel.

  The main piping section 20 is formed by connecting pipes having necessary shapes such as L-shape and T-shape to each other by welding to form a substantially U-shape as a whole, and a straight pipe is laterally extended from the vicinity of the bottom of the U-shape. One pair of branched shapes are arranged one by one on the left and right sides of the front surface of the vacuum pump 11 so that the sides where the branch pipes are provided face each other. The main piping portion 20 is fixed to the piping mounting portion 13B of the frame 13 via the mounting bracket 14 by welding and screwing.

  In the two U-shaped portions in the main piping portion 20, a narrow tube having a smaller diameter than the pipe used for the U-shaped portion is connected to one of the pair of tip portions (the end portion located on the inner side). The narrow tube extends upward and rearward. The tip of the thin tube provided in one (right side in FIG. 2) main pipe portion 20 is at the inlet 11A of the vacuum pump 11, and the tip of the thin tube provided in the other (left side in FIG. 2) main pipe portion 20 is the vacuum pump 11. Are respectively connected to the exhaust ports 11B. One (the right side in FIG. 2) U-shaped portion and the subsequent narrow tube path is connected to the intake port 11A of the vacuum pump 11 and serves as an intake-side flow channel 21 that is a flow channel of gas sucked into the pump. ing. Further, the path formed by the other U-shaped portion (left side in FIG. 2) and the subsequent narrow tube is connected to the exhaust port 11B of the vacuum pump 11 and an exhaust side flow path 22 which is a flow path of gas discharged from the pump. Is done.

  In the intake-side flow path 21 and the exhaust-side flow path 22, an intake-side opening / closing valve 24, and an end on the opposite side to the side connected to the intake port 11 A and the exhaust port 11 B of the vacuum pump 11, respectively, The exhaust side opening / closing valve 25 is attached by screwing.

Further, the end portions of the two branch pipes are connected to each other by a bypass side on-off valve 26. A path constituted by the pair of branch pipes and the bypass side on-off valve 26 connecting them is a bypass flow path 23 that bypasses between the intake side flow path 21 and the exhaust side flow path 22. The bypass flow path 23 branches from a position slightly upstream of the connection portion with the intake port 11 </ b> A of the vacuum pump 11 in the intake side flow path 21, and is slightly downstream of the connection portion with the exhaust port 11 </ b> B of the vacuum pump 11 in the exhaust side flow path 22. It is configured to be connected to the position. Due to the presence of the bypass passage 23, the SF ₆ gas can be sent to the recovery container 38 by bypassing the vacuum pump 11.

  The collection container 38 is light, can be folded compactly when not in use, etc., can be sealed to prevent the collected gas from leaking, and is corroded by the gas to be collected. It is preferable to satisfy the requirements such as being a difficult material. For example, a gas collection bag such as a Tedlar bag can be used. One end of the collection-side hose 35 is fixed to the collection port of the collection container 38 in an airtight state.

  Moreover, as the apparatus side hose 31 and the collection | recovery side hose 35, it is preferable to use the resin-made tubes which are light and easy to carry. The material of the hoses 31 and 35 is required to be resistant to corrosion by the gas to be collected.

  The gas supply port 51 of the LDS 50 and one end of the device-side hose 31, the connection port (the intake-side on / off valve 24) of the device-side hose 31 and the apparatus body 10, and the exhaust-side channel 22 of the apparatus body 10 The connection port (exhaust-side opening / closing valve 25) and the recovery-side hose 35 can be connected and separated by a joint, respectively. As the joint, for example, a coupler (registered trademark) can be used.

  The first coupler 41 that connects the gas replenishing port 51 of the LDS 50 and the device-side hose 31 includes a first plug 41A that is a male-side joint and a first socket 41B that is a female-side joint. Here, although not shown in detail, the gas supply port 51 of the LDS 50 that is a target of gas recovery by the gas recovery apparatus 1 of the present embodiment has a needle stop valve structure. That is, by removing the cap and rotating the stop valve in the loosening direction, a gap is formed between the valve and the valve seat, and a gas path from the soot tube lid is formed. For this reason, the first socket 41B is connected by removing the cap of the stop valve and screwing it into the stop valve. On the other hand, the first plug 41 </ b> A is connected to one end portion of the equipment side hose 31 via the equipment hose side opening / closing valve 32 and the hose joint 33.

  When the gas replenishing port 51 of the LDS 50 is configured to open and close by rotating the stop valve as described above, when the stop valve is rotated after the device side hose 31 is attached, the device side hose 31 is turned on. May be twisted, which may interfere with the opening / closing operation of the stop valve and gas recovery. In order to avoid such a problem of torsion of the hose, for example, a joint with a twist prevention mechanism having a mechanism that allows rotation around the tube axis of the hose after connection can be used. As such a joint with a torsion prevention mechanism, for example, there is one in which an adapter for connecting a hose is rotatably attached to the joint body.

  The second coupler 42 that connects the end of the intake side flow path 21 of the apparatus main body 10 on the side where the intake side on-off valve 24 is provided and the device side hose 31 is connected to the second plug 42A, which is a male side joint, and the female. It is comprised with the 2nd socket 42B which is a side joint. The second plug 42A is connected to the intake side on-off valve 24 by screwing. On the other hand, the second socket 42B is connected to the other end of the device-side hose 31 (the side opposite to the side to which the first plug 41A is connected) via a hose joint 34.

  The third coupler 43 that connects the end of the exhaust side flow path 22 of the apparatus body 10 on the side where the exhaust side opening / closing valve 25 is provided and the recovery side hose 35 is connected to a third plug 43A, which is a male side joint, and a female. It is comprised with the 3rd socket 43B which is a side joint. The third socket 43B is connected to the exhaust side opening / closing valve 25 by screwing. On the other hand, the third plug 43 </ b> A is connected to one end of the collection side hose 35 (the side opposite to the side fixed to the collection container 38) via the collection hose side opening / closing valve 36 and the hose joint 37.

  In consideration of the simplicity of work at the site, the three couplers 41, 42, 43 are both connected with the insertion of the plugs 41A, 42A, 43A into the sockets 41B, 42B, 43B at the time of connection. It is preferable to employ a so-called one-touch connection type (rapid coupling) in which the locking operation of the locking member that holds the lock is impossible to prevent.

  In the present embodiment, the sockets 41B, 42B, and 43B are closed when the plugs 41A, 42A, and 43A are not connected, and open when the plugs 41A, 42A, and 43A are connected. , 42C and 43C are used. Thereby, socket 41B, 42B, 43B becomes a structure which serves as an on-off valve.

  Next, a method for recovering gas from the LDS 50 using the gas recovery apparatus 1 configured as described above will be described.

  When performing gas recovery, the operator carries the gas recovery device 1 to the site where the LDS 50 is installed and assembles it. Here, the apparatus main body 10 is an integrated body of the vacuum pump 11 and the main piping part 20, and a handle part 13C is attached. Further, the weight of the apparatus main body 10 including the vacuum pump 11, the main piping part 20, and the handle part 13C is a weight that can be carried by one adult. For this reason, the operator can carry the apparatus main body 10 easily by lifting the apparatus main body 10 by holding the handle 13C. Further, the collection container 38 is a gas collection bag that is lightweight and foldable and easy to carry. Thus, since the gas recovery apparatus 1 is excellent in portability, the operator can easily carry the gas recovery apparatus 1 to the site and perform assembly work.

  When assembling, first, after confirming that all the on-off valves 24, 25, 26, 32, and 36 and the stop valves in the gas supply ports 51 of the LDS 50 are closed, the gas supply ports 51 are stopped. The cap is removed from the valve, and the first socket 41B is fixed to the stop valve by screwing. Next, by connecting the first socket 41B and the first plug 41A, the second socket 42B and the second plug 42A, and the third socket 43B and the third plug 43A, respectively, the LDS 50, the apparatus main body 10, and the apparatus main body 10 are collected. The container 38 is connected via the apparatus side hose 31 and the collection | recovery side hose 35, respectively. By connecting the plugs 41A, 42A, 43A, the valves provided in the sockets 41B, 42B, 43B are opened.

  Next, the stop valve of the gas supply port 51 is rotated and opened in a loosening direction. Next, in a state where the operation of the vacuum pump 11 is stopped, the five on-off valves 24, 25, 26, 32 and 36 are sequentially opened from the side close to the gas supply port 51 of the LDS 50. Since the inside of the gas sealing part of the LDS 50 is in a pressurized state of about 0.1 to 0.2 MPa, by opening the valve, the gas inside flows out naturally, and the device side hose 31 and the apparatus main body 10 It flows into the collection container 38 through the main piping part 20 and the collection side hose 35. At this time, the gas cannot pass through the vacuum pump 11 because the vacuum pump 11 is stopped. That is, the stopped vacuum pump 11 plays a role of closing the flow path from the suction side flow path 21 through the inside of the vacuum pump 11 to the discharge side flow path 22, and the gas is collected through the bypass flow path 23. The container 38 is reached. As a result, the gas can be recovered without operating the vacuum pump 11 until the inside of the gas enclosure is depressurized to near atmospheric pressure.

  When the inside of the gas enclosure is reduced to near atmospheric pressure, the bypass side on-off valve 26 is closed and the vacuum pump 11 is operated. As a result, the gas remaining in the gas enclosure is sucked by the vacuum pump 11 and is collected from the intake side flow path 24 through the inside of the vacuum pump 11 and the exhaust side flow path 25 to the collection container 38.

  When all the gases are collected from the gas sealing portion of the LDS 50, the open / close valves 24, 25, 32, and 36 are sequentially closed from the side close to the gas supply port 51 of the LDS 50, and then the vacuum pump 11 is stopped. The end of the recovery can be determined by checking the gauge attached to the LDS 50. The operation may be stopped after the operation is continued for about one minute after the gauge pressure becomes almost zero. Finally, the sockets 41B, 42B, and 43B and the plugs 41A, 42A, and 43A in the three couplers 41, 42, and 43 are separated, and the collection operation is completed.

  In the case of gas recovery from the LDS 50, a small amount of gas is recovered by one recovery operation. Therefore, after the collection operation is performed a plurality of times and the collection container 38 is full, only the collection container 38 and the collection-side hose 35 fixed to the collection container 38 are removed from the apparatus main body 10 and brought into the gas processing facility to be harmless. Can be done.

  As described above, according to the gas recovery apparatus 1 of the present embodiment, the apparatus main body 10 includes the vacuum pump and the main piping section 20 including the intake side flow path 21, the exhaust side flow path 22, and the bypass flow path 23. A frame 13 that is integrated and includes a handle 13C for carrying is attached. According to such a configuration, the operator can carry the vacuum pump and necessary piping at a time by holding the handle portion 13C and lifting the apparatus body 10. Thus, the gas recovery apparatus 1 of this embodiment is excellent in portability and workability, and is extremely suitable for gas recovery from a small switching facility such as the LDS 50.

  In addition, an intake-side on-off valve 24 and an exhaust-side on-off valve 25 are attached to end portions of the intake-side flow path 21 and the exhaust-side flow path 22 that are connected to the equipment-side hose 31 and the recovery-side hose 35, respectively. ing. Further, the device hose 31 has a device hose side opening / closing valve 32 attached to one end thereof, and the other end side attached to a first socket 41B of a first coupler 41 having a valve body therein. In addition, a collection hose side opening / closing valve 36 is attached to the end of the collection side hose 35 opposite to the side fixed to the collection container 38. In this way, in the pipes constituting the gas flow path, all end portions that serve as connection ports with the other side pipes are provided with on-off valves.When separating the connections between the pipes, It is done after closing. According to such a configuration, it is possible to avoid the gas remaining inside the pipe from flowing out into the atmosphere and to reliably recover the gas. Such a gas recovery apparatus 1 is very suitable for easily recovering an insulating gas having a warming effect from a small switching facility such as the LDS 50 without releasing it into the atmosphere.

The gas recovery rate by the gas recovery device was measured.
A gas recovery apparatus having the same configuration as that of the above embodiment was manufactured as the apparatus main body. Also, two pressure-resistant bags made of resin were prepared, one of which was a collection bag and the other was an enclosed bag, and one end of each hose was fixed in an airtight manner.

The weight of the collection bag was measured in advance. Further, after the weight of the encapsulating bag was measured in advance, SF ₆ gas was encapsulated therein, and the weight after enclosing was measured. Thereafter, the hose on the collection bag side was connected to the exhaust side flow path of the apparatus main body, and the hose on the enclosed bag side was connected to the intake side flow path of the apparatus main body. A coupler and an on-off valve were interposed at the connection portion between the hose and the apparatus main body as in the above embodiment.

The vacuum pump of the apparatus main body was operated, and SF ₆ gas sealed in the sealing bag was recovered in the recovery bag. After completion of the collection operation, the on-off valve was closed to separate the hose from the apparatus main body, and the weights of the enclosing bag and the collection bag were measured. Table 1 shows the measured values of the weight of the enclosing bag and the collecting bag before and after the collecting operation. In addition, since the measurement of the weight of an enclosure bag and a collection bag was performed in the state which fixed the hose, the weight of a hose is included in a measured value.

From Table 1, the weight of the SF ₆ gas moved from the encapsulating bag to the collecting bag can be calculated by obtaining the difference in weight between the enclosing bag and the collecting bag before and after the collecting operation. The weight of SF ₆ gas sealed in the sealing bag was 36.05 g, whereas the weight of SF ₆ gas recovered in the recovery bag was 35.92 g. From this result, it was found that there was almost no gas leakage to the outside due to the recovery operation, and a recovery rate of 99% or more could be achieved. Note that 0.13 g of gas, which is the difference between the weight of the encapsulating bag before the collecting operation and the weight of the collecting bag after the collecting operation, is considered to be a residue in the pipe of the apparatus main body.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, a coupler that does not have a built-in valve body on the plug side is used as the coupler. Therefore, the plug is connected to the main piping part and the hose via the on-off valve. However, a structure in which a valve body is incorporated may be used, and the plug may also serve as the valve body.
(2) Conversely, a socket that does not have a built-in valve body may be used and connected to the main piping section or hose via an on-off valve.

DESCRIPTION OF SYMBOLS 1 ... Gas recovery apparatus 10 ... Apparatus main body 11 ... Vacuum pump 11A ... Intake port 11B ... Exhaust port 13C ... Handle part 20 ... Main piping part 21 ... Intake side Flow path 22 ... Exhaust side flow path 23 ... Bypass flow path 24 ... Intake side open / close valve (open / close valve)
25 ... Exhaust side open / close valve (open / close valve)
31 ... Equipment side hose (connection piping part)
32 ... Equipment hose side open / close valve (open / close valve)
35 ... Recovery hose (connecting piping)
36 ... Recovery hose side open / close valve (open / close valve)
38 ... Recovery container 42B ... Second socket (open / close valve)
43B ... 3rd socket (open / close valve)

Claims (5)

A gas recovery device for recovering an insulating gas enclosed in a switching facility of a distribution substation,
A vacuum pump, an intake-side flow path connected to the intake port of the vacuum pump, an exhaust-side flow path connected to the exhaust port of the vacuum pump, and a space between the intake-side flow path and the exhaust-side flow path An apparatus main body integrally provided with a main pipe portion having a bypass flow path that bypasses and connects the vacuum pump, and a handle portion for carrying the vacuum pump,
A collection container for storing the insulating gas;
A gas recovery apparatus comprising: a connecting pipe section that connects between the opening / closing device and the intake side flow path and between the exhaust side flow path and the recovery container.   The gas recovery device according to claim 1, wherein an opening / closing valve is provided at a connection port between the main piping unit and the connecting piping unit and the other piping unit. The main pipe part and the connection pipe part are connected by a joint,
The joint includes a socket provided with a fluid passage inside, a plug provided with a fluid passage inside and connected to the socket, and a locking member that holds the socket and the plug so as not to be detached from each other. The gas recovery device according to claim 1 or 2, wherein the gas recovery device is a quick coupling that is provided with a locking operation of the locking member in association with the connecting operation of the plug and the socket.   A torsion prevention mechanism in which the connecting pipe part and the opening / closing facility are connected by a joint, and the joint allows rotation of the connecting pipe part around the tube axis in a state where the connecting pipe part is connected to the joint. The gas recovery device according to any one of claims 1 to 3, wherein the gas recovery device is a joint with a twist prevention mechanism.   The gas recovery device according to any one of claims 1 to 4, wherein the switchgear is a load disconnector.

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