JP2011099743A - Displacer recovering device of displacer-type liquid level gage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacer recovering device of a displacer-type liquid level gage for recovering easily a sinked displacer when a length measuring wire breaks. <P>SOLUTION: A storage tank includes a guide pipe 13. The displacer-type liquid level gage includes a length measuring wire 11, which is wound and sent out of a balance driver, provided with a displacer 12. A basket housing portion 21 is formed on the lower end side of the guide pipe 13 of the displacer-type liquid level meter. A recovering basket 22 is housed in the basket housing portion 21. A basket holding device 25 is attached to the length measuring wire 11 and holds and/or detaches the recovering basket 22. A folding portion 22c is formed at an opening portion of the recovering basket 22. The basket holding device 25 includes an arm 27, a rotation memeber 28 rotatably attached to the arm 27, an engaging claw 29 formed on the rotation memeber 28 and engageably with the folding portion 22c. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a displacer type liquid level gauge used for measuring the liquid level of a liquid stored in a storage tank. When a wire connected to a displacer is cut, the displacer with the cut wire is The present invention relates to a displacer recovery device for a displacer type liquid level gauge used for recovery.

  As a kind of liquid level gauge for measuring the liquid level (position of liquid level) in storage tanks of LNG (liquefied natural gas), LPG (liquefied petroleum gas), other liquefied gases, and storage tanks of various liquids, for example A displacer type liquid level gauge having the configuration shown in FIG. 7 is known (see, for example, Patent Document 1).

  The displacer type liquid level gauge I shown in FIG. 7 is provided with a balance driving machine 10 on the upper side of the roof portion 1a of the storage tank 1, and is unwound from a wire drum (not shown) of the balance driving machine 10 and suspended in the storage tank 1. A displacer 12 having a specific gravity greater than that of the stored liquid 4 in the storage tank 1 is attached to the lower end (tip) of the lowered measuring wire 11.

  In the displacer type liquid level gauge I, when the displacer 12 suspended from the length measuring wire 11 is partially immersed in the storage liquid 4 in the storage tank 1, the displacer 12 changes the storage liquid 4 to the storage liquid 4. Buoyancy according to the volume of the submerged part comes to act. Therefore, the tension acting on the length measuring wire 11 that suspends the displacer 12 from the balance driving machine 10 changes with respect to when the displacer 12 is suspended in the air.

  Therefore, the displacer 12 is unwound and unwound by the balance driver 10 in a state in which the tension acting on the length measuring wire 11 is maintained so that the flooding of the displacer 12 is constant. It can be moved up and down accurately following the liquid level of the storage liquid 4. Therefore, when the displacer 12 is lifted and lowered following the liquid level of the storage liquid 4 in this manner, the length of the length measuring wire 11 unwound from the balance driving machine 10 is used to determine whether or not the inside of the storage tank 1 The liquid level of the storage liquid 4 can be measured.

  Further, the displacer type liquid level gauge I avoids the influence on the displacer 12 even when the storage liquid 4 in the storage tank 1 undulates as the storage liquid 4 is received in the storage tank 1. In order to be able to measure the liquid level of the storage liquid 4, a guide pipe 13 extends through the roof portion 1 a of the storage tank 1 to the vicinity of the bottom of the storage tank 1. The displacer 12 is arranged inside (inside) the guide pipe 13. The guide pipe 13 is formed with guide holes 14 at required intervals in the vertical direction so that the liquid level of the stored liquid 4 is the same inside and outside the guide pipe 13.

  Further, a calibration chamber 15 having a maintenance manhole 16 is attached to the upper end portion of the guide pipe 13 via a full-bore gate valve 17, and is attached to a flange 15 a at the upper end portion of the calibration chamber 15. The balance drive machine 10 is attached. The length measuring wire 11 unwound from the balance driving machine 10 passes through the calibration chamber 15 and the gate valve 17 and is connected to the displacer 12 disposed inside the guide pipe 13.

  By the way, in the displacer type liquid level gauge I, when the length measuring wire 11 is cut due to an unexpected situation, the displacement of the displacer 12 cannot be detected, and the liquid level of the stored liquid 4 cannot be measured. Further, when the measuring wire 11 is cut in this way, the displacer 12 sinks to the bottom of the guide pipe 13. In this case, the displacer type liquid level gauge I is not provided with a means for collecting the displaced displacer 12, so that the displacer 12 cannot be collected.

  In addition, when this displacer type liquid level gauge I is provided in a storage tank that is periodically opened and inspected like the LPG storage tank 1, the length measuring wire 11 may be caused by an unexpected situation. Even if it is cut, it is possible to collect the displacer 12 with the length measurement wire 11 cut from the bottom of the guide pipe 13 at the next opening inspection. Therefore, when the period until the next opening inspection is long, the displacer 12 that has been sunk by cutting the length measuring wire 11 is left at the bottom of the guide pipe 13 until the next opening inspection, and the length measuring wire is cut. By connecting 11 to the new displacer 12 as it is or after replacement, the function of the displacer type liquid level gauge I can be recovered and the operation can be continued.

  However, when this displacer-type liquid level gauge I is provided in the LNG storage tank, periodic opening inspection is not performed. Therefore, if the measuring wire 11 is cut due to an unexpected situation, the bottom of the guide pipe 13 There will be no opportunity to collect the displacer 12 that has settled down. Further, when the displacer 12 sunk in the bottom of the guide pipe 13 is left for a long period of time, the broken piece of the measuring wire 11 remaining on the displacer 12 side gradually becomes a pump for discharging LNG from the LNG storage tank. There is also a concern that the suction pump is sucked and a malfunction occurs in the discharge pump.

  Against this background, there has been proposed a displacer collection device that includes means for collecting the displacer 12 in the displacer-type liquid level gauge I having the guide pipe 13 (Patent Document 2). reference). The displacer collection device includes a basket storage portion provided at the lower end side of the guide pipe, the collection basket is stored in the basket storage portion, and a basket holding device capable of holding and releasing the collection basket. It is a thing.

Japanese Utility Model Publication No. 7-20531 JP 2009-14471 A

  However, in the displacer collection device, the basket holding device requires a hanging wire and an operation wire for operating the hook that is locked to the collecting basket and pulls it up. Therefore, it cannot be directly attached to the balance drive machine, and a dedicated temporary winch is required. Therefore, when actually collecting the collection basket, the balance driving machine is once removed and a temporary winch is attached. However, such replacement with a temporary winch is very complicated and an improvement is desired.

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is that when the measuring wire connecting the displacer is cut, it is not necessary to replace the balance drive machine with the temporary winch, It is an object of the present invention to provide a displacer collecting device for a displacer type liquid level gauge that can easily collect a displacer that has sunk.

A displacer recovery device for a displacer-type liquid level gauge according to the present invention comprises a guide pipe that penetrates a roof portion of a storage tank and extends vertically in the storage tank, and is attached to the upper end side of the guide pipe. When a displacer is attached to the tip of the measuring wire that is further unwound, and the displacer is disposed on the liquid level of the stored liquid based on the tension acting on the measuring wire inside the guide pipe with a constant amount of water, The displacer-type liquid level gauge configured to measure the liquid level of the stored liquid in the storage tank based on the length dimension of the measuring wire unwinding from the balance driving machine. A basket storage section is provided on the lower end side, the collection basket is stored in the basket storage section, and the side length that is unwound from the balance drive unit Attached to ear, it includes a basket holding device which is adapted for holding and / or withdrawal of the collecting basket,
In the opening of the collection basket, a folded portion is provided that is folded inward at an acute angle,
The basket holding device has a fixture that is attached to the side wire, three or more arms that are radially connected to the fixture, and one end that is pivotally attached to the lower end of the arm. The rotating member and an engaging claw provided on the other end side of the rotating member so as to be engageable with the folded portion of the collecting basket are characterized in that the rotating member is provided.

According to this displacer recovery device, the basket holding device is attached to a side long wire that is unwound from the balance drive machine, three or more arms that are radially connected to the fixture in plan view, A rotating member having one end side rotatably attached to the lower end portion, and an engaging claw provided on the other end side of the rotating member and engageable with the folded portion. Therefore, when the length measurement wire is cut unexpectedly and the displacer sinks to the bottom of the guide pipe, the basket holding device is attached to the side length wire without replacing the balance drive machine with a temporary winch. The displacer can be collected by lifting the collection basket with the apparatus.
That is, when the length measuring wire is unexpectedly cut and the displacer sinks to the bottom of the guide pipe, the displacer that has settled is housed in a collection basket housed in the basket housing portion of the guide pipe. Therefore, the basket holding device suspended by operating the balance driving device is lowered, the engaging claw is locked to the folded portion of the collecting basket, and then the basket holding device is raised to raise the collecting basket. The displacer contained in the can be collected.

Further, in the displacer recovery device, the basket holding device is rotatably connected so that the arm is in a state of being hung down and closed from a state of being radially opened with respect to the fixture. Is preferred.
In this way, after the collection basket is pulled up to collect the displacer, when the collection basket is stored again in the basket storage section of the guide pipe, the balance drive unit is operated to suspend the collection basket. The holding device is lowered and positioned in the basket storage portion. And the engagement nail | claw to the folding | returning part of this engagement nail | claw can be cancelled | released by positioning the engaging claw latched by the folding | returning part of the collection | recovery basket further below this folding | returning part. When the locked state is released in this manner, the arm is pivotable with respect to the fixture, and therefore, the arm is suspended from the fixture due to its own weight. Therefore, by raising the basket holding device with the arm closed in this way again, the basket holding device can be lifted without being interfered with the collection basket.

Further, in the displacer collecting device, the basket holding device is a holder that holds the arm in an open state by being attached to the arm with the arm being radially open with respect to the fixture. Is preferably provided.
In this way, when collecting the displacer that has been sunk by lifting the collection basket, the arm is previously opened radially in plan view so that the arm is attached to the arm as described above. The basket for collection can be easily lifted by the basket holding device provided with.

Further, in the displacer recovery device, the inner diameter of the basket housing portion is equal to or smaller than the inner diameter of the roof penetration portion of the storage tank at the upper end portion of the guide pipe. It is preferable to keep it.
In this way, the collection basket stored in the basket storage section can be surely passed through the roof penetrating portion of the guide pipe, and therefore it is more reliable and easy to collect the displacer with the length measuring wire cut. .

Further, in the displacer recovery apparatus, the guide pipe is configured such that the diameter of the roof penetration portion of the storage tank at the upper end of the guide pipe is smaller than the diameter of the portion of the guide pipe located in the storage tank. In addition, it is preferable that the basket storage portion is provided on the lower end side of the guide pipe with a reducer interposed.
In this way, even if the displacer with the length measurement wire cut down sinks to a position displaced from the axial center of the guide pipe, the displacer is guided by the reducer so that the displacer inside the basket storage portion can be recovered. It comes to be securely stored in the basket.

  In the displacer recovery device of the displacer type liquid level gauge according to the present invention, when the length measuring wire is cut and the displacer sinks to the bottom of the guide pipe, the balance drive unit is not replaced with a temporary winch. Since the displacer can be collected by attaching the basket holding device to the long wire and lifting the collection basket with this basket holding device, once the displacer is collected, the balance drive is temporarily removed. Then, complicated work such as attaching a temporary winch is not necessary, and workability can be greatly improved. Further, it is not necessary to provide a temporary winch separately from the balance driving device for collecting the displacer, and therefore, maintenance management of the temporary winch becomes unnecessary, and the cost can be reduced accordingly. Furthermore, the equipment cost required for the temporary winch can be eliminated, and the equipment cost of the entire displacer recovery device can be reduced.

It is a figure which shows one Embodiment of the displacer collection | recovery apparatus of the displacer type liquid level gauge of this invention, (a) is principal part sectional drawing which shows the normal operation state of a displacer liquid level gauge, (b) is collection | recovery of a displacer. It is a principal part sectional side view which shows the state which performs. It is a principal part expanded sectional view which expands and shows the collection | recovery basket and basket holding | maintenance apparatus in the apparatus of FIG. It is a figure which shows schematic structure of a basket holding | maintenance apparatus, Comprising: (a) is a side view, (b) is a top view, (c) is a side view in the state without a holder, (d) is a perspective view which shows a holder. It is. (A)-(d) is a figure which shows operation | movement of the engaging claw in a basket holding device. It is principal part sectional drawing which shows the state which has lifted the collection | recovery basket by the basket holding | maintenance apparatus. It is principal part sectional drawing which shows the state which has suspended the collection | recovery basket with the basket holding | maintenance apparatus. It is principal part sectional drawing which shows schematic structure of an example of the displacer collection | recovery apparatus of the conventional displacer type liquid level gauge.

Hereinafter, the displacer collection device of the displacer type liquid level gauge of the present invention will be described in detail.
FIGS. 1A, 1B, and 2 are views showing an embodiment of a displacer recovery device for a displacer type liquid level gauge of the present invention. In these drawings, reference numeral 1 denotes a storage tank. This storage tank 1 stores LNG (liquefied natural gas) 4a as a storage liquid, and has a displacer type liquid level gauge I of the type provided with a guide pipe 13 as in the example shown in FIG. It is. 1A, 1B, and 2, the same components as those in FIG. 7 are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 1A, a basket storage portion 21 is formed at the lower end of the guide pipe 13, and a basket 22 for collecting the displacer 12 is stored in the basket storage portion 21. In the displacer type liquid level gauge I, when the length measuring wire 11 of the balance driving machine 10 is cut and the displacer 12 sinks to the bottom of the guide pipe 13, as shown in FIG. A basket holding device 25 is provided that collects the displacer 12 by lifting the 22.

  The guide pipe 13 has a portion (a roof penetration portion) 13a that penetrates the roof portion 1a of the storage tank 1 at its upper end portion, which is formed in a relatively small diameter. The part 13b to be formed is formed to have a larger diameter than the roof penetrating part 13a. Thereby, in the roof penetration part 13a of the guide pipe 13, the heat input from the outside into the storage tank 1 is suppressed, and a small gate diameter is used as the gate valve 17 connected to the upper side of the roof penetration part 13a. It is supposed to be.

  In addition, a taper portion 13c that gradually increases in diameter from the upper end side toward the lower end side is provided between the roof penetrating portion 13a of the guide pipe 13 and the portion 13b located in the storage tank 1. Thus, a step in the vertical direction is not formed on the peripheral wall surface of the guide pipe 13.

  Further, at the lower end side of the guide pipe 13, a basket storage portion 21 having the same diameter as the roof penetration portion 13 a or a slightly smaller diameter and a depth corresponding to the height of the collection basket 22. However, they are integrally formed through the reducer 19. The reducer 19 is formed by gradually reducing the diameter from the guide pipe 13 to the basket storage portion 21. As shown in FIG. 2, the basket storage portion 21 has, for example, a cross-shaped bottom portion (not shown) at the lower end portion thereof, and holds the collection basket 22 inserted therein from above. It is like that.

  The collection basket 22 has an outer diameter corresponding to the inner diameter of the basket storage portion 21, that is, an outer diameter slightly smaller than this, and has a height dimension substantially equal to the height of the basket storage portion 21. It has a bottom cylindrical shape. In other words, the collection basket 22 has a cylindrical bottom portion 22b attached to the lower end portion of the cylindrical side wall 22a, thereby allowing the LNG 4a to circulate in the collection basket 22. .

  Further, the collection basket 22 is provided with a folded portion 22c that is folded back inward at an acute angle over the entire circumference in the upper end of the side wall 22a, that is, the opening of the collection basket 22. Yes. The folded portion 22c is inclined obliquely downward so as to be substantially flush with the inclined surface formed by the inner wall surface of the reducer 19, and as will be described later, the engaging claw 29 of the basket holding device 25 is engaged from below. It is configured to match.

  The basket holding device 25 is configured to be operable by the balance driving machine 10 via the side long wire 11, and as shown in FIG. 3A, the basket holding device 25 has an annular shape attached to the side long wire 11. An attachment 26 comprising a suspension ring 26a and a cylindrical attachment tube 26b connected to the suspension ring 26a, three arms 27 connected radially to the attachment tube 26b of the attachment 26 in a plan view, The rotating member 28 is rotatably attached to each lower end portion, and the engaging claw 29 is provided on each of the rotating members 28.

  The three arms 27 are connected to the mounting cylinder 26b so as to be pivotable in the vertical direction so that the arm 27 hangs down and closes from a state in which the arm 27 is opened radially to the mounting cylinder 26b. It is. These three arms 27 are arranged at equal intervals in the circumferential direction with respect to the mounting cylinder 26b. Therefore, as shown in the plan view of FIG. 3B, the angle formed by the adjacent arms 27 is made. However, they are arranged radially in plan view so as to be 120 °. With such a configuration, the three arms 27 can be suspended in a well-balanced manner without tilting to one side when the collection basket 22 is lifted or suspended as will be described later. Of course, the number of arms 27 may be four or more as long as the collection basket 22 can be suspended in a well-balanced manner.

  Further, in this embodiment, as shown in FIG. 3A, the arm 27 has three elongated plates 30a, 30b, 30c made of a light metal such as aluminum, which are rotated by pins or the like (not shown). It is configured to be connected so that the rotation location is between the mounting cylinder 26b and the plate body 30a connected thereto, between the plate body 30a and the plate body 30b connected to the lower end side thereof, Further, there are three places between the plate body 30b and the plate body 30c connected to the lower end side thereof. Therefore, at normal times, as shown by the solid line in FIG. 3C, these arms 27 are suspended from the mounting cylinder 26b by their own weight.

  Therefore, in the present embodiment, as shown by a two-dot chain line in FIG. 3A, the arm 27 opens radially with respect to the mounting cylinder 26b in a plan view and hangs down at a predetermined angle. A holding tool 31 that holds the arm 27 in an open state by being detachably attached to the arm 27 is provided. The holder 31 has a Y shape corresponding to the planar shape of the three arms 27 shown in FIG. 3B, and has a substantially isosceles triangle shape in side view as shown in FIG. That is, it is formed by connecting three substantially right triangular plate bodies 31a in a Y shape in plan view. With this configuration, the holding tool 31 is fixedly attached to the three arms 27 with screws or the like, so that the three arms 27 are attached to the mounting cylinder 26b as shown in FIG. It opens radially in plan view and is held in a state where it hangs down at a predetermined angle.

The rotating member 28 is made of an elongated plate material such as stainless steel or a rod material, and one end side of the rotating member 28 is a third plate body 30c constituting the arm 27, that is, the plate body 30c farthest from the mounting cylinder 26b. It is attached to a lower end part (end part on the opposite side to the attachment cylinder 26b) so that rotation is possible.
Further, as shown in FIG. 4A, an engaging claw 29 is integrally attached to the rotating member 28 at the other end on the side opposite to the plate body 30c. The engaging claw 29 has a substantially right triangle shape, and its upper side 29a is an engaging side that engages with the folded portion 22c of the collection basket 22, and the outer oblique side 29b is formed in a substantially arc shape. It is.

Further, as shown in FIG. 3 (a), the three arms 27 are opened radially by a holder 31 and held in a state of hanging down at a predetermined angle. The outer diameter of the planar shape shown in FIG. 3B is formed so as to be approximately equal to the inner diameter of the collection basket 22. Then, as shown in FIG. 4A, the rotating member 28 hangs downward in the vertical direction and has a diameter when viewed in plan, that is, a total of three rotations attached to the three arms 27. The diameter of the circle passing through the moving member 28 is formed to be approximately equal to the inner diameter formed by the inner edge of the folded portion 22 c of the collection basket 22.
Based on such a configuration, the engaging claw 29 is detachably engaged with the folded portion 22c of the collection basket 22 by the turning operation of the turning member 28.

  As shown in FIGS. 1A and 1B, a purge gas supply line 40 and a gas discharge line 41 are connected to the calibration chamber 15. Thereby, when opening the maintenance manhole 16 of the calibration chamber 15, the gate valve 17 is closed to disconnect the calibration chamber 15 from the atmosphere inside the storage tank 1, and then the calibration chamber 15 is filled. The vaporized gas of the LNG 4a can be purged to the gas discharge line 41 by a purge gas 42 such as nitrogen gas supplied from the purge gas supply line 40.

  Since the storage liquid in the storage tank 1 is LNG 4a having a cryogenic temperature of −162 ° C., the members that come into contact with the LNG 4a such as the basket storage portion 21, the collection basket 22, the basket holding device 25, etc. are basically It is made of stainless steel.

  When using the displacer recovery device of the displacer type liquid level gauge having the above-described configuration, as shown in FIG. 1A, the recovery basket 22 is previously placed in the basket storage portion 21 on the lower end side of the guide pipe 13. Keep it in the stowed state. It should be noted that the balance drive unit 10 is attached to the upper side of the calibration chamber 15, and in this state, like the displacer type liquid level gauge I shown in FIG. The liquid level of the LNG 4a in the storage tank 1 is measured based on the amount of unwinding from the balance driving machine 10 of the length measuring wire 11 connected to the displacer 12 arranged on the surface with constant flooding.

  While the displacer type liquid level gauge I is operating in this way, when the length measuring wire 11 is cut due to an unexpected situation, the displacer 12 sinks in the guide pipe 13 and is collected in the basket storage portion 21. In the basket 22 for use, it comes to be accommodated. At that time, since the reducer 19 is provided between the lower end portion of the guide pipe 13 and the basket storage portion 21, even if the displacer 12 sinks at a position off the axial center in the guide pipe 13. The displacer 12 is guided by the reducer 19 so that the displacer 12 is surely accommodated in the collection basket 22 inside the basket storage portion 21.

On the other hand, if the length measuring wire 11 is cut in this way, the tension due to the weight of the displacer 12 does not act on the length measuring wire 11 that is unwound from the balance driving device 10. The cutting of the long wire 11 is easily detected.
When the cutting of the length measuring wire 11 is detected in this way, first, all the length measuring wires 11 unwound from the balance driving device 10 are wound up to the balance driving device 10 side.
Next, after closing the gate valve 17, the vaporized gas of the LNG 4a filled in the calibration chamber 15 is purged.

  Next, the maintenance manhole 16 is opened, and the basket holding device 25 is attached to the lower end portion (tip portion) of the length measuring wire 11 wound up earlier. Here, as the basket holding device 25, as shown by a two-dot chain line in FIG. 3A, a holding tool 31 is attached in advance to the arm 27, whereby the three arms 27 are attached to the mounting cylinder. It is held in a state where it opens radially in plan view with respect to 26b and hangs down at a predetermined angle.

  After the basket holding device 25 is attached in this manner, the maintenance manhole 16 is closed, and the gate valve 17 is opened. Then, the length measuring wire 11 is unwound from the balance driving machine 10 again, and the basket holding device 25 is connected to the guide pipe. 13 is lowered to the inside of the collection basket 22 at the lower end. Then, the outer diameters of the three arms 27 are substantially equal to the inner diameter of the collection basket 22, and the rotating member 28 has an outer diameter substantially equal to the inner diameter formed by the inner edge of the folded portion 22 c of the collection basket 22. Since they are equal, the engaging claws 29 attached to these rotating members 28 are engaged with the folded portion 22c of the collection basket 22 by the rotating operation of the rotating member 28 as shown in FIG.

  That is, when the basket holding device 25 is lowered to the inside of the collection basket 22, as shown in FIG. 4B, the oblique side 29b of the engaging claw 29 comes into contact with the upper surface of the folded portion 22c. When further lowered, the engaging claws 29 slide inward along the slope of the upper surface of the folded portion 22c that is folded at an acute angle as shown in FIGS. 4 (c) and 4 (d). That is, the engaging claw 29 slides inward on the upper surface of the folded portion 22c as the rotating member 28 rotates. When the basket holding device 25 is further lowered and the engagement claw 29 further slides, the engagement claw 29 slides down from the upper surface of the folded portion 22c. Then, the engaging claw 29 falls off from the upper surface of the folded portion 22c, so that the rotating member 28 is rotated downward in the vertical direction by its own weight. Thereby, the engaging claw 29 has its upper side 29a engaged with the inner edge of the folded portion 22c as shown in FIG.

  Therefore, when the engaging claw 29 is engaged with the folded portion 22c as shown in FIG. 2, the length measuring wire 11 unwound by the balance driving machine 10 is wound up again while maintaining the state. As a result, the collection basket 22 can be pulled up as shown in FIG. 5, and therefore the displacer 12 accommodated in the collection basket 22 can be collected. That is, when the collected recovery basket 22 reaches the calibration chamber 15, the balance driver 10 is stopped and the gate valve 17 is closed. Then, after purging the vaporized gas of LNG 4a in the calibration chamber 15, the maintenance manhole 16 is opened, and the displacer 12 accommodated in the lifted collection basket 22 is collected.

  When the displacer 12 is collected in this way, the length measuring wire 11 wound up by the balance driving machine 10 is unwound again in order to store the collection basket 22 in the basket storage unit 21 again. The holder 31 is removed from the 25 arms 27. Thus, even if the holder 31 is removed, the engagement state of the engagement claw 29 with respect to the folded portion 22c of the collection basket 22 is maintained. Therefore, the arm 27 is held in a state in which the plate bodies 30a, 30b, 30c extend in a straight line by the weight of the collection basket 22, and thus is held in the same state as when the holding tool 31 is attached. .

  Subsequently, the maintenance manhole 16 is closed and the gate valve 17 is opened. Then, the length measuring wire 11 wound up by the balance driving machine 10 is unwound, and the collection basket 22 suspended from the basket holding device 25 is stored in the basket storage portion 21 as shown in FIG. Then, after the collection basket 22 reaches the bottom of the basket storage portion 21, the basket holding device 25 is further lowered.

  Then, since the engagement claw 29 is disengaged from the folded portion 22c of the collection basket 22, the arm 27 is rotated by its own weight from the state shown by the two-dot chain line in FIG. 3C to the state shown by the solid line. It moves (down) and closes. Therefore, when it is confirmed that the engagement claw 29 is disengaged in this way, the length measuring wire 11 is again wound up by the balance driving device 10, and then the gate valve 17, the maintenance manhole 16 and the like are operated. Then, the basket holding device 25 is detached from the length measuring wire 11 in the calibration chamber 15.

  Thereafter, the previously collected displacer 12 is attached to the length measuring wire 11, and in that state, the length measuring wire 11 is unwound again by the balance driving device 10, and the displacer 12 is lowered to the liquid level of the LNG 4a. Hold. Thereby, the function of the displacer type liquid level gauge I can be recovered.

  In such a displacer recovery device of the displacer type liquid level gauge I, when the length measuring wire 11 is cut and the displacer 12 sinks to the bottom of the guide pipe 13, the balance driver 10 is replaced with a temporary winch. The displacer 12 can be recovered by attaching the basket holding device 25 to the side long wire 11 and lifting the collection basket 22 by the basket holding device 25. When the battery is collected, a complicated operation such as once removing the balance driving machine 10 and then attaching a temporary winch is not required, and the workability can be greatly improved. Further, it is not necessary to provide a temporary winch separately from the balance drive unit 10 for collecting the displacer 12, so that maintenance management of the temporary winch becomes unnecessary, and the cost can be reduced accordingly. Furthermore, the equipment cost required for the temporary winch can be eliminated, and the equipment cost of the entire displacer recovery device can be reduced.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, the sizes of the displacer 12, the guide pipe 13, the basket storage portion 21, and the collection basket 22 are not limited to the illustrated sizes, and may be appropriately determined according to the actual size of the storage tank 1 and the properties of the liquid to be stored. Can be changed. In addition, regarding the material of each of the above members, a material other than stainless steel can be adopted depending on the properties of the liquid to be stored.

  In addition, the displacer recovery apparatus of the present invention is suitable for use as a displacer recovery apparatus when a displacer type liquid level gauge having a guide pipe 13 is installed in the storage tank 1 of the LNG 4a. The present invention may be applied to a displacer type liquid level gauge I installed in a storage tank 1 for storing liquid.

  Further, with respect to the recovery basket 22, when it is lifted or hung while being held in the basket holding device 25, a stored liquid such as LNG 4a can be flowed so as not to cause a large resistance, and a length measuring wire is used. If the cut end of the length measuring wire 11 attached to the displacer 12 side that sinks into the collection basket 22 when the cut 11 is cut does not pass easily, the bottom 22b is made of a structure other than a mesh such as punching metal. In addition, the side wall 22a may have the same structure as the bottom 22b.

  In addition, the collection basket 22 is prevented from tilting out of balance or swinging like a pendulum when it is lifted or suspended while being held in the basket holding device 25. A balance weight may be provided on the basket 22 or the basket holding device 25.

  DESCRIPTION OF SYMBOLS 1 ... Storage tank, 1a ... Roof part, 4a ... LNG (storage liquid), 10 ... Balance drive machine, 11 ... Measuring wire, 12 ... Displacer, 13 ... Guide pipe, 13a ... Roof penetration part, 13b ... In storage tank 16 ... maintenance manhole, 17 ... gate valve, 19 ... reducer, 21 ... basket storage section, 22 ... collection basket, 25 ... basket holding device, 26 ... fixture, 27 ... arm, 28 ... times Moving member, 29 ... engaging claw, 31 ... holder

Claims (5)

A guide pipe that penetrates the roof of the storage tank and extends in the vertical direction in the storage tank is provided, and a displacer is attached to the tip of the length measuring wire that is unwound from the balance drive attached to the upper end of the guide pipe. The displacer is unwound from the balance driving machine when the displacer is placed on the liquid surface of the stored liquid with constant flooding based on the tension acting on the length measuring wire inside the guide pipe. A displacer type level gauge configured to measure the liquid level of the storage liquid in the storage tank based on the length dimension is provided with a basket storage portion on the lower end side of the guide pipe, and the basket storage portion A collection basket is accommodated, and is further attached to a side long wire that is unwound from the balance driving device, and holds and / or holds the collection basket. It includes a basket holding device to perform the withdrawal,
In the opening of the collection basket, a folded portion is provided that is folded inward at an acute angle,
The basket holding device has a fixture that is attached to the side wire, three or more arms that are radially connected to the fixture, and one end that is pivotally attached to the lower end of the arm. A displacer type comprising: a rotating member; and an engaging claw provided on the other end side of the rotating member so as to be engageable with the folded portion of the collection basket. Displacer collection device for liquid level gauge.   The basket holding device is pivotally connected so that the arm hangs down from a state of opening in a radial manner with respect to the fixture in a suspended state. Displacer-type liquid level gauge displacer recovery device.   The basket holding device includes a holding tool that holds the arm in an open state by being attached to the arm in a state where the arm is radially opened with respect to the mounting tool. The displacer recovery device for a displacer type liquid level gauge according to claim 2.   The inner diameter of the basket storage portion is equal to or smaller than the inner diameter of the roof penetration portion of the storage tank at the upper end portion of the guide pipe. The displacer collection | recovery apparatus of the displacer type liquid level gauge as described in any one of 1-3.   The guide pipe is configured such that the diameter of the roof penetration portion of the storage tank at the upper end of the guide pipe is smaller than the diameter of the portion of the guide pipe located in the storage tank, and the lower end of the guide pipe 5. The displacer recovery device for a displacer type liquid level gauge according to claim 4, wherein the basket storage portion is provided on the side with a reducer interposed.

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