JP4769087B2 - Gas purge device and gas purge method - Google Patents

Description

  The present invention relates to a gas purging apparatus and a gas purging method for replacing a gas in a gas pipe with another gas.

  If a new gas pipe is installed on the existing gas pipe, a part of the existing gas pipe is replaced with a new gas pipe, or a part of the existing gas pipe is abolished, the air in the pipe line Is replaced with gas, or construction is performed to replace gas with air. In these replacement works, a method of purging gas or air in the pipe line from the communication hole drilled in the gas pipe is generally used.

  For example, as described in Patent Document 1, in a gas supply facility for an apartment house, the gas pipe on the upstream side of gas distribution is replaced with a new gas pipe from the gas pipe extending to the apartment house (in the literature, a common vertical pipe). In this case, the purge gas is pushed into the common vertical pipe from the gas meter installed downstream of the new gas pipe, and the gas is supplied from the upstream side of the gas flow through the new gas pipe. The gas in the pipe line is discharged from a communication hole (bypass saddle in the literature) provided in a simple gas pipe.

  In this way, while supplying the purge gas from the gas meter installed on the downstream side of the new gas pipe, the gas is supplied from the upstream side of the gas flow of the new gas pipe and exhausted from the communication hole. It is possible to purge the air in the gas pipe and the air mixed in the common vertical pipe on the downstream side.

Japanese Patent Laying-Open No. 2005-133888 (FIG. 2)

  In such a conventional air purge, the air in the gas pipe can be purged when the gas in a mixed state of air and gas is exhausted from the communication hole. However, when the gas pipe is separated into layers such that the gas moves to the upper layer and the air moves to the lower layer in the gas pipe, the gas layer in the upper layer continues to be released from the communication hole in the conventional air purge, and thus If the predetermined time elapses in such a state, the operator may consider that the purge operation has been completed. If it is considered that the purge operation has been completed in this way, air may remain in the gas pipe, causing troubles such as misfire.

  Also, when purging air from a gas separated into two layers of gas and air, the air with a higher specific gravity is purged after releasing the gas layer with a lower specific gravity. Therefore, there is a problem that the working time for purging becomes long.

  The present invention has been proposed in view of such a problem, and provides a gas purging apparatus and a gas purging method in which the purging operation time is shortened and air does not remain in the gas pipe and there is no possibility of causing trouble such as misfire. The purpose is to provide.

  In order to solve such a problem, the gas purging apparatus of the present invention is inserted through a first communication hole drilled in a gas pipe (for example, the existing gas pipe Tu in the embodiment) and expands in the gas pipe. A partition part that can move to the downstream side of the gas flow while partitioning the inside of the pipe (for example, the new gas pipe Ts in the embodiment), and the gas pressure in the pipe line on the upstream side of the gas flow from the partition part should not be smaller than a predetermined value. A movement control unit that controls the movement of the partition wall to the downstream side of the gas flow is provided, and the partition wall moves through the gas pipe to the downstream side of the gas flow while receiving movement control by the movement control unit, and the gas flow from the partition wall. Replacing the gas in the gas pipe on the downstream side with another gas in the gas pipe on the upstream side of the gas flow from the partition wall while discharging the gas from the second communication hole drilled in the gas pipe on the downstream side of the gas flow from the first communication hole. It is characterized by.

  According to the present invention, the partition wall is moved to the downstream side of the gas flow so that the gas pressure in the pipeline on the upstream side of the gas flow does not become smaller than the predetermined value from the partition wall that can move to the downstream side of the gas flow while partitioning the inside of the gas pipe. Therefore, the gas in the gas pipe on the downstream side of the gas flow from the partition wall is transferred to the other side of the gas pipe on the upstream side of the gas flow by simply moving the partition wall from the upstream side of the gas flow in the gas pipe to the downstream side. The gas can be replaced with For this reason, the gas in the gas pipe on the downstream side of the gas flow from the partition wall can be reliably replaced with the gas in the gas pipe on the upstream side of the gas flow from the partition wall. For this reason, when the gas in the gas pipe on the downstream side of the gas distribution from the partition wall contains air, this gas can be reliably replaced with a gas that does not contain air in the gas pipe on the upstream side of the gas flow from the partition wall, Air does not remain in the gas pipe after the replacement, and it is possible to prevent the occurrence of troubles such as misfire. Even in the case where the gas in the gas pipe on the downstream side of the gas flow from the partition wall is separated into layers, the gas in the gas pipe on the downstream side of the gas flow is compressed by the movement of the partition wall and forced from the second communication hole. Therefore, the operation time for purging the gas can be shortened.

  Further, the movement control unit of the present invention has a string member and can wind up the string member, and the leading end portion of the string member is inserted into the gas pipe from the second communication hole and then into the gas pipe from the first communication hole. Connected to the inserted partition wall and controls the hoisting of the string member so that the gas pressure in the pipe on the upstream side of the gas flow from the partition wall does not become lower than the predetermined value, thereby controlling the movement of the partition wall to the downstream side of the gas flow It is characterized by doing.

  According to this invention, the movement control unit controls the winding of the string member so that the gas pressure in the pipe on the upstream side of the gas flow from the partition wall does not become smaller than the predetermined value, so that the partition wall can Regardless of fluctuations in the gas pressure in the upstream pipe line, it moves only by winding up the string member, so that the movement of the partition wall can be stabilized and gas replacement in the gas pipe can be ensured.

  The movement control unit of the present invention has a suction pipe that is inserted from the second communication hole and can suck the gas in the gas pipe, and the gas pressure in the pipe upstream of the gas flow from the partition wall does not become lower than a predetermined value. In this way, the gas suction by the suction pipe is controlled to control the movement of the partition wall to the gas flow downstream side.

  According to this invention, the movement control unit controls the gas suction by the suction pipe so that the gas pressure in the pipe on the upstream side of the gas flow from the partition wall does not become smaller than the predetermined value, so that the partition wall Regardless of the fluctuation of the gas pressure in the pipe on the upstream side of the flow, the gas moves only by gas suction, so that the movement of the partition wall is stabilized and the replacement of the gas in the gas pipe can be ensured. Further, since the gas is sucked in the pipe line on the downstream side of the gas flow, the replacement with the gas in the pipe line on the upstream side of the gas flow can be made more reliable.

  In addition, the movement control unit of the present invention has a string member and can feed the string member, and the leading end portion of the string member is inserted into the gas pipe from the first communication hole, and then into the gas pipe from the first communication hole. The gas pressure in the pipe line that is connected to the inserted partition wall and that changes due to the movement of the partition wall part that receives the gas pressure in the pipeline upstream of the partition wall and moves downstream of the gas stream does not become lower than a predetermined value. Thus, the feeding of the string member is controlled.

  According to this invention, the movement control unit controls the feeding of the string member so that the gas pressure in the pipeline on the upstream side of the gas flow from the partition unit does not become lower than the predetermined value, so that the partition unit Since it moves under pressure, the contact pressure between the partition wall and the gas pipe inner surface can be reduced. For this reason, the internal pressure which expands a partition part can be made small, and damage to a partition part can be suppressed.

  The partition wall of the present invention regulates the bag body that is inserted from the first communication hole and can be inflated and contracted in the gas pipe, and the bag body that is provided so as to wrap the bag body and expands to a predetermined size. And a shape regulating means.

  According to this invention, since the partition wall portion includes the bag body and the shape regulating means, the bag body expanded in the gas pipe can be maintained at a predetermined size. For this reason, the frictional resistance between the inner surface of the partition wall and the partition wall can be made substantially constant, and the movement amount of the partition wall can be easily set according to the gas pressure in the gas pipe on the downstream side of the gas flow. This makes it easy to control the movement of the partition wall.

  Furthermore, the gas purge method of the present invention is a gas purge method for replacing the gas in the gas pipe with another gas, and a partition wall portion that expands in the gas pipe and moves to the downstream side of the gas flow while partitioning the gas pipe is provided in the gas pipe. Controlling the movement of the partition wall portion to the downstream side of the gas flow so that the gas pressure in the pipeline upstream of the partition wall portion does not become lower than a predetermined value. The step of replacing the gas in the gas pipe on the downstream side of the gas flow from the partition wall with another gas on the upstream side of the gas flow from the partition wall while discharging the gas from the second communication hole drilled on the downstream side of the gas flow from the first communication hole. And a step of shrinking the partition wall in the gas pipeline and taking it out from the second communication hole.

  According to the present invention, the partition wall portion inserted from the first communication hole controls the movement of the partition wall portion to the downstream side of the gas flow so that the gas pressure in the pipeline on the upstream side of the gas flow does not become smaller than the predetermined value. By replacing the gas in the gas pipe on the gas flow downstream side from the partition wall with another gas on the gas flow upstream side from the partition wall while discharging from the second communication hole, the gas is taken out from the second communication hole. Even when the gas in the gas pipe on the downstream side of the gas flow from the partition wall contains air, the gas must be reliably replaced with the gas in the gas pipe on the upstream side of the gas flow from the partition wall. Can do. For this reason, air does not remain in the gas pipe line, and it is possible to prevent the occurrence of troubles such as misfire. Further, even when the gas in the gas pipe on the downstream side of the gas flow from the partition wall is separated into layers, the gas in the downstream side of the gas flow is compressed by the movement of the partition wall and forced from the second communication hole. Therefore, the working time for purging the gas can be shortened.

  According to the gas purging apparatus and the gas purging method according to the present invention, the partition wall portion prevents the gas pressure in the pipeline on the upstream side of the gas flow from becoming smaller than a predetermined value from the partition wall portion that can move to the downstream side of the gas flow while partitioning the inside of the gas pipe. By controlling the movement of the gas to the downstream side of the gas flow, it is possible to shorten the purge work time and to prevent the possibility of causing troubles such as misfire due to air remaining in the gas pipe.

  Hereinafter, preferred embodiments of a gas purging apparatus and a gas purging method according to the present invention will be described with reference to FIGS. In this embodiment, an example in which a part of an existing gas pipe (hereinafter referred to as “existing gas pipe”) is replaced with a new gas pipe (hereinafter referred to as “new gas pipe”) is taken as an example. explain. First, before explaining the gas purging method of the present invention, the gas purging apparatus will be explained.

  As shown in FIG. 1 (side view), the gas purging device 1 is inserted from the first communication hole 3 drilled in the existing gas pipe Tu upstream of the new gas pipe Ts and is expanded in the new gas pipe Ts. Then, the partition wall 10 can be taken out from the second communication hole 4 which is moved to the downstream side of the gas flow while partitioning the inside of the new gas pipe Ts and is drilled in the existing gas pipe Tu on the downstream side of the new gas pipe Ts. And a movement control unit 30 that controls the movement of the partition wall 10 toward the downstream side of the gas flow so that the gas pressure in the pipe upstream of the partition wall 10 does not become smaller than a predetermined value.

  As shown in FIG. 2A (partial cross-sectional view), the partition wall 10 has a bag body 11 that can be inflated and contracted in a gas pipe, and a bag body 11 that is provided so as to wrap and expand the bag body 11 to a predetermined size. And shape regulating means 15 for regulating the thickness.

  The bag body 11 is made of a synthetic resin material (for example, polyurethane rubber) and has flexibility, has a substantially rugby ball shape in the inflated state, and is folded in the reduced state to be the first communication hole 3 shown in FIG. And can be taken out through the second communication hole 4 while being inserted into the newly installed gas pipe Ts. The bag body 11 is provided with an air inlet (not shown), and air can be injected into the bag body 11 through a tube connected to the air inlet and the air in the bag body 11 can be discharged. .

  The shape regulating means 15 is configured such that the peripheral surface of the central portion 11a of the bag body 11 inflated in the gas pipe has a predetermined width in the direction in which the pipe extends and contacts the inner face of the gas pipe. It is formed in a substantially rugby ball shape similar to the bag body 11 inflated by arranging and connecting fine wires 16 (for example, piano wires) in a lattice shape. The fine metal wire 16 is folded together with the bag body 11 and can pass through the first communication hole 3 and the second communication hole 4 shown in FIG. The shape restricting means 15 has a size such that the bag body 11 expanded in the gas pipe does not move to the downstream side of the gas flow due to the gas pressure in the gas pipe. For this reason, the partition wall portion 10 installed and expanded in the gas pipe does not move to the downstream side of the gas flow even when the gas pressure in the gas pipe is received.

  In addition, as shown in FIG.2 (b) (side view), the partition part 10 may be formed in the substantially truncated cone shape which lacked the one side edge part of the rugby ball.

  As shown in FIG. 1, the movement control unit 30 that controls the movement of the partition wall 10 configured as described above detects the gas pressure upstream of the gas flow from the partition wall 10 inserted in the newly installed gas pipe Ts. The string member 41 has a gas pressure detecting unit 31 and a string member (for example, a piano wire) 41, and the string member 41 can be wound and unwound, and the leading end of the string member 41 is connected to one side of the shape regulating means 15 of the partition wall 10. A control main body part that is connected to the end part and controls the movement of the partition wall part 10 to the downstream side of the gas flow by controlling the winding of the string member 41 so that the detection value detected by the gas pressure detection part 31 does not become smaller than a predetermined value. 40. The predetermined value is an allowable lower limit value of the gas pressure in the existing gas pipe Tu.

  The gas pressure detection unit 31 includes a sensor unit 32 that detects a gas pressure, and a gas pressure detection main unit 33 that converts a detection value from the sensor unit 32 into a gas pressure value and sends the gas pressure value to the control main unit 40. The detection value detected by the sensor unit 32 is sent to the gas pressure detection main unit 33 through the cable 34, and the gas pressure value sent from the gas pressure detection main unit 33 is sent to the control main unit 40 through the cable 35. .

  The control main body 40 includes a drum 43 that winds the string member 41, a motor (not shown) that rotates the drum 43, and a controller (not shown) that controls driving of the motor according to the gas pressure value sent from the gas pressure detector 31. It has. The controller controls the winding of the string member 41 by controlling the rotation of the drum 43 so that the gas pressure value sent from the gas pressure detecting unit 31 does not become smaller than a predetermined value. For this reason, the gas pressure in the new gas pipe Ts on the upstream side of the gas distribution from the partition wall 10 does not become smaller than a predetermined value.

  Next, a gas purge method for replacing the air in the new gas pipe Ts with gas when a part of the existing gas pipe Tu is replaced with the new gas pipe Ts using the gas purge apparatus 1 described above will be described. First, as shown in FIG. 3A (side view), the first communication hole 3 and the second communication hole 4 are connected to the existing gas pipe Tu on the gas flow upstream side and the gas flow downstream side from the replacement part of the existing gas pipe Tu. Perforate. Then, after the gas bag 50 is inserted into the existing gas pipe Tu from the first communication hole 3 and installed on the upstream side of the gas flow, another gas bag 51 is inserted into the existing gas pipe Tu from the first communication hole 3. Installed on the downstream side of the gas flow. Then, after the gas bag 52 is inserted into the existing gas pipe Tu from the second communication hole 4 and installed on the downstream side of the gas flow, the gas bag 53 is inserted into the existing gas pipe Tu from the second communication hole 4 to gas. Installed on the upstream side of distribution and shuts off the existing gas pipe Tu. Then, a part of the existing gas pipe Tu blocked by these gas bags 50 to 53 is replaced with a new gas pipe Ts.

  Then, as shown in FIG. 3B (side view), the pair of gas bags 51 and 53 inserted inside the existing gas pipe Tu are taken out from the first communication hole 3 and the second communication hole 4, and the tip portion A cable 56 connected to a small parachute 55 is inserted into the existing gas pipe Tu from the first communication hole 3. And low pressure air, CNG gas, etc. are sent from the 1st communicating hole 3, and the parachute 55 is moved to the gas distribution downstream side in the newly installed gas pipe Ts. When the parachute 55 moves near the second communication hole 4, a rod-shaped member (not shown) is inserted from the second communication hole 4, and the parachute 55 is hooked on the rod-shaped member or the like to be taken out. In addition, the cable 56 is passed through the gas conduit between the second communication hole 4 and the second communication hole 4.

  Then, the cable member 56 is connected to the cable member 56 wound around the drum 43 of the control main body 40 and connected to the cable 56 extending from the second communication hole 4, and the cable 56 extending from the first communication hole 3 into the existing gas pipe Tu. The string member 41 is unwound from the drum 43 and passed through the newly installed gas pipe Ts and extended outward from the first communication hole 3, and the string member 41 is inserted into the gas pipe between the first communication hole 3 and the second communication hole 4. Connect to.

  And the front-end | tip part of the string member 41 is connected with the one side edge part of the shape control means 15 of the partition part 10, and the partition part 10 is made into a contracted state and it inserts in the existing gas pipe Tu from the 1st communicating hole 3. Then, as shown in FIG. 3C (side view), the partition wall portion 10 is expanded to block the gas flow between the gas flow upstream side and the downstream side from the partition wall portion 10. The sensor unit 32 is inserted into the existing gas pipe Tu from the first communication hole 3.

  And electric power is supplied to the gas pressure detection part 31 and the control main-body part 40, and these are made into the state which can operate | move. Then, as shown in FIG. 3D (side view), the gas bag 50 installed on the upstream side of the gas flow is removed from the first communication hole 3 and the gas in the existing gas pipe Tu is supplied to the new gas pipe Ts. To do. When the gas bag 50 is removed, the gas pressure in the existing gas pipe Tu acts on the partition wall portion 10, and the partition wall portion 10 is urged downstream of the gas flow. However, since the partition wall portion 10 is expanded so as not to move even when subjected to gas pressure as described above, the partition wall portion 10 does not move downstream of the gas flow. When the gas pressure detection unit 31 detects that the gas pressure in the existing gas pipe Tu on the upstream side of the gas distribution from the partition wall 10 is greater than a predetermined value, the control main body 40 moves the drum 43 in the direction in which the string member 41 is wound up. Rotate. As a result, the partition wall 10 moves in the newly installed gas pipe Ts to the gas flow downstream side. When the gas pressure in the existing gas pipe Tu on the upstream side of the gas flow from the partition wall 10 is to become smaller than a predetermined value, the control main body 40 stops the rotation of the drum 43 and moves to the downstream side of the gas flow in the partition wall 10. Regulate the movement of

  In this way, the partition wall 10 moves from the gas flow upstream side of the newly installed gas pipe Ts to the gas flow upstream side. At the same time, the air in the new gas pipe Ts on the downstream side of the gas flow from the partition wall 10 is discharged from the second communication hole 4 and is replaced with the gas in the existing gas pipe Tu on the upstream side of the gas flow from the partition wall 10. . When the partition wall portion 10 moves close to the second communication hole 4, the partition wall portion 10 contracts and is taken out from the second communication hole 4, and the sensor portion 32 is taken out from the first communication hole 3. Close the communication hole.

  As a result, air does not remain in the newly installed gas pipe Ts, and a situation in which troubles such as misfires occur can be prevented. Further, even when the gas in the new gas pipe Ts on the downstream side of the gas distribution from the partition wall 10 is separated into two layers of gas and air, this layered gas moves to the downstream side of the gas flow. Therefore, the working time for purging the gas can be shortened.

  Further, the partition wall 10 moves only by winding the string member 41 without being affected by the fluctuation of the gas pressure in the pipe upstream of the gas flow, so that the movement of the partition wall 10 is stabilized and newly installed. The replacement of the gas in the gas pipe Ts can be ensured.

  As shown in FIG. 4 (side view), the control main body 40 of the movement control unit 30 has a suction pipe 45 that is inserted from the second communication hole 4 and can suck the gas in the new gas pipe Ts. May be. In this case, the control main body 40 controls the gas suction by the suction pipe 45 so that the gas pressure in the pipe on the upstream side of the gas flow from the partition wall 10 does not become lower than a predetermined value, thereby controlling the gas flow downstream of the partition wall 10. Control movement to.

  In this way, the same effect as that of the control main body 40 provided with the string member 41 described above, that is, the remaining of the air in the newly installed gas pipe Ts can be eliminated, and the purge operation time can be shortened. Since air is sucked in the pipe line on the downstream side of the flow, the replacement with the gas in the pipe line on the upstream side of the gas flow can be made more reliable.

  Further, as shown in FIG. 5 (side view), the control main body 40 of the movement control unit 30 is capable of feeding and unwinding the string member 41, and the leading end of the string member 41 is newly provided from the first communication hole 3. Inserted into the gas pipe Ts and connected from the first communication hole 3 to the partition wall portion 10 inserted into the newly installed gas pipe Ts, receives the gas pressure in the pipeline upstream of the partition wall portion 10 and receives the gas flow downstream. You may make it control feeding of the string member 41 so that the gas pressure in a pipe line which changes with the movement of the partition part 10 which moves to the side may not become smaller than a predetermined value.

  In this way, since the partition wall portion 10 receives the gas pressure in the pipeline and moves, the contact pressure between the partition wall portion 10 and the inner surface of the new gas pipe Ts can be reduced, and the internal pressure of the expanding partition wall portion 10 can be reduced. Damage to the partition wall 10 that can be reduced can be suppressed.

The side view of the gas purge apparatus concerning one embodiment of this invention is shown. The partition part of this gas purge apparatus is shown, FIG. 6A is a partial sectional view of the partition part, and FIG. 5B is another partition part. The side view for demonstrating the gas purge method is shown. The side view of the gas purge apparatus concerning other embodiment of this invention is shown. The side view of the gas purge apparatus concerning other embodiment of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas purge apparatus 3 1st communicating hole 4 2nd communicating hole 10 Partition part 11 Back main body 15 Shape control means 30 Movement control part 41 String member 45 Suction pipe Ts Newly installed gas pipe (gas pipe)
Tu Existing gas pipe (gas pipe)

Claims (6)

A partition wall portion which is inserted from the first communication hole perforated in the gas pipe, expands in the gas pipe and is movable in the gas flow downstream side while partitioning the gas pipe;
A movement control unit for controlling the movement of the partition wall to the gas flow downstream side so that the gas pressure in the pipeline on the gas flow upstream side from the partition wall does not become smaller than a predetermined value;
The partition wall moves to the downstream side of the gas flow while receiving movement control by the movement control unit, and the gas in the gas pipe on the downstream side of the gas flow from the partition wall flows through the first communication hole. A gas purging apparatus, wherein the gas purge device substitutes other gas in the gas pipe on the upstream side of the gas flow from the partition wall while discharging from the second communication hole drilled in the gas pipe on the downstream side.   The movement control unit has a string member and can wind up the string member, and the distal end portion of the string member is inserted into the gas pipe from the second communication hole, and the gas communication pipe is inserted into the gas pipe from the first communication hole. The string member is connected to the partition wall inserted in the pipe, and the hoisting of the string member is controlled so that the gas pressure in the pipe on the upstream side of the gas flow from the partition wall does not become lower than a predetermined value. The gas purging apparatus according to claim 1, wherein the movement of the gas is controlled.   The movement control unit has a suction pipe that is inserted from the second communication hole and can suck the gas in the gas pipe, and the gas pressure in the pipe upstream of the gas flow from the partition wall does not become lower than a predetermined value. The gas purging apparatus according to claim 1, wherein the gas suction by the suction pipe is controlled to control the movement of the partition wall to the gas flow downstream side.   The movement control unit has a string member, and the string member can be drawn out, and a distal end portion of the string member is inserted into the gas pipe from the first communication hole, and the gas communication pipe is inserted into the gas pipe from the first communication hole. The gas pressure in the pipe line, which is connected to the partition wall inserted in the pipe and receives the gas pressure in the pipe line upstream of the partition wall from the partition wall and moves to the downstream side of the gas stream, changes to a predetermined value. The gas purging apparatus according to claim 1, wherein the feeding of the string member is controlled so as not to become smaller.   The partition wall has a shape that restricts the bag body that is inserted through the first communication hole and can be inflated and contracted in the gas pipe, and the bag body that is provided so as to wrap the bag body and expands to a predetermined size. The gas purging device according to claim 1, further comprising a regulating unit. A gas purge method for replacing the gas in the gas pipe with another gas,
Inserting a partition wall portion that expands in the gas pipe and can move to the gas flow downstream side while partitioning the gas pipe from a first communication hole drilled in the gas pipe;
The movement of the partition wall to the downstream side of the gas flow is controlled so that the gas pressure in the pipeline upstream of the partition wall does not become smaller than a predetermined value, Replacing the gas with the other gas upstream of the partition wall part while discharging the gas from the second communication hole perforated on the gas flow downstream side of the first communication hole;
And a step of shrinking the partition wall in the gas pipeline and taking it out from the second communication hole.

Images