JP2009285570A - Strainer - Google Patents

Abstract

To provide a strainer that can easily replace a screen member and prevent the screen member from being wrinkled or damaged.
A strainer for use in unloading or loading a liquid such as liquefied natural gas from a tanker, comprising: a bottomed reinforcing outer cylinder having a plurality of perforated holes; The bottomed reinforcing inner cylinder having a perforation hole and a screen member having a finer filter than the permeation hole, the screen member being narrowed between the reinforcing outer cylinder and the reinforcing inner cylinder. Since it is configured to be held, the screen member can be easily replaced, and the screen member can be prevented from being wrinkled or broken.
[Selection] Figure 1

Description

  The present invention relates to a transport tanker for liquefied natural gas, which is attached to the base of a tanker side liquefied natural gas flow path when unloading or loading liquefied natural gas from a tanker. And a strainer for removing foreign matter.

In general, strainers are widely used to remove dust and foreign substances from liquids. For example, a strainer described in Japanese Patent Application Laid-Open No. 2000-291124 has a swirl separation chamber in which one end portion in the axial direction is closed and a drain port is provided at the other end portion in the axial direction, and a tangent line or a tangent line of the swirl separation chamber. A sewage introduction passage provided in a direction to introduce sewage into the swirl separation chamber, a cylindrical inner strainer corresponding to the drain outlet and attached to the swirl separation chamber, and a tangent line of the swirl separation chamber or A foreign matter discharge passage that is provided near the tangential line and discharges the foreign matter swirling together with the sewage in the swirl separation chamber together with a part of the sewage, and the upstream outlet of the sewage main pipe is connected to the inlet of the sewage introduction passage In addition, a downstream inlet of the sewage main pipe is connected to the drain outlet, and a foreign substance transport pipe is connected to the outlet of the foreign substance discharge passage.
As another strainer, a combination of a screen and a perforated plate has been proposed.
JP 2000-291124 A

  However, the conventional strainer having such a structure is not only used to separate foreign substances such as dust and scum contained in the sewage from the sewage but also unloads crude oil and liquefied natural gas from the tanker. When loading or loading on a tanker, it is attached to the base of the tanker-side liquefied natural gas flow path and used as a garbage collector for unloading and loading pipelines. In that case, the flow rate of liquefied natural gas is extremely fast and the screen (filtering part) has a fine mesh, so the permeation load of crude oil and liquefied natural gas is high, causing wrinkles and breakage of the screen frequently. Existed.

Further, in the case of a strainer configured by combining a screen and a perforated plate, there has been a problem that inspection and replacement work of the screen is difficult because each member is welded.
The present invention has been proposed in view of the above circumstances, and provides a strainer that can prevent wrinkles and breakage of the screen and can improve the efficiency of inspection and replacement of the screen. Objective.

  In order to achieve the above object, the present invention is attached to the base of the liquefied natural gas flow path on the tanker side when unloading the liquefied natural gas from the liquefied natural gas transport tanker or when loading it onto the transport tanker. A bottomed reinforcing outer cylindrical body having a plurality of perforated holes, a bottomed reinforcing inner cylindrical body having a plurality of perforating holes, and a The screen member is provided with a fine filter, and the screen member is sandwiched between the reinforcing outer cylinder and the reinforcing inner cylinder.

  In the present invention, the screen member is a bottomed cylindrical body. In the present invention, the reinforcing outer cylindrical body and the reinforcing inner cylindrical body are formed in a truncated conical shape whose diameter decreases toward the bottom.

  In the present invention, the reinforcing outer cylindrical body, the reinforcing inner cylindrical body, and the screen member have an opening fixed to an annular flange. In the present invention, a plurality of guide ribs project in the radial direction on the outer periphery of the bottom portion of the reinforced outer cylinder whose diameter is reduced.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  In the present invention, when unloading liquefied natural gas from a tanker for transporting liquefied natural gas, or when loading to a tanker for transporting, the strainer is used by being attached to the base of the liquefied natural gas flow path on the tanker side. A bottomed reinforcing outer cylinder having a plurality of perforations, a bottomed reinforcing inner cylinder having a plurality of perforations, and a screen member having a finer filter than the perforations Since the screen member is sandwiched between the reinforcing outer cylinder and the reinforcing inner cylinder, the screen member can be prevented from being wrinkled or damaged. In addition, the efficiency of screen inspection and replacement work can be improved.

  Further, in the present invention, the screen member is a bottomed cylinder, and the reinforcing outer cylinder and the reinforcing inner cylinder are formed in a truncated cone shape whose diameter is reduced toward the bottom. Can be easily attached and removed, and can be easily inspected and replaced.

  In the present invention, since the openings of the reinforcing outer cylinder, the reinforcing inner cylinder, and the screen member are fixed to the annular flange, the screen member is wrinkled even if the flow rate of the liquefied natural gas is high. Or can be prevented from being damaged. In the present invention, since the plurality of guide ribs project in the radial direction on the outer periphery of the bottom portion of the reinforced outer cylinder whose diameter is reduced, it is possible to stabilize the attachment of the strainer.

  The present invention relates to a screen member provided with a bottomed reinforcing outer cylinder body having a plurality of perforation holes, a bottomed reinforcing inner cylinder body having a plurality of perforation holes, and a finer filter than the permeation holes. The screen member is configured to be sandwiched between the reinforcing outer cylinder and the reinforcing inner cylinder, so that the screen member can be easily replaced and inspected, and the screen member is wrinkled or damaged. Can be prevented from occurring.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. 1 is a front view showing an embodiment of a strainer according to the present invention, FIG. 2 is a bottom view of the strainer of the present invention, FIG. 3 is a longitudinal sectional view of the strainer of the present invention, and FIG. 4 is an exploded perspective view thereof. . Here, the strainer 10 is used by being attached to the base of the liquefied natural gas flow path on the tanker side when unloading or loading the liquefied natural gas from the liquefied natural gas transport tanker. A bottomed reinforcing outer cylinder 12 having a plurality of perforation holes 11 formed therein, a bottomed reinforcing inner cylinder 14 having a plurality of permeation holes 13 formed therein, The screen member 15 includes a fine filter, and the screen member 15 is sandwiched between the reinforcing outer cylindrical body 12 and the reinforcing inner cylindrical body 14.

  The reinforcing outer cylinder 12 is formed of a stainless steel or the like that is formed in a truncated cone shape and in which the transmission holes 11 are provided on substantially the entire circumference. The transmission hole 11 is formed, for example, by punching holes in a plate member at a predetermined interval. In addition, a transmission hole 11 is formed in the bottom surface 12a. A plurality of guide ribs 16 project radially from the outer periphery of the bottom portion of the reinforced outer cylinder 12 with a reduced diameter, and a guide plate 17 is attached to the tip thereof. In this embodiment, the guide ribs 16 are attached to the outer periphery of the reinforcing outer cylinder 12 at intervals of 90 degrees, and the outer peripheral position of the guide plate 17 fixed to the tip is the opening 12c (large diameter) of the reinforcing outer cylinder 12. Part) It is comprised so that it may be located on the virtual circle equal to an outer periphery. The guide plate 17 is curved with a curvature substantially equal to the outer periphery of the opening 12c (large diameter portion) of the reinforcing outer cylinder 12. Bolt holes 12 b are formed on the bottom surface 12 a of the reinforced outer cylinder 12 at positions corresponding to the bolt holes 25 formed on the bottom surface of the reinforced inner cylinder 14.

  An annular flange 18 is attached to the outer periphery of the opening 12 c of the reinforcing outer cylinder 12, and a pair of handle members 19, 19 are extended to the outer periphery in the radial direction of the annular flange 18. Bolt holes 21 for fixing the screen member 15 are formed in the annular flange 18. Further, the tip of the handle member 19 is bent at a substantially right angle toward the closed end of the reinforcing outer cylinder. The handle member 19 is formed with a fixing hole 20 for fixing to the tanker base.

  FIG. 5 is a cross-sectional view showing the screen member 15 used in the strainer 10 of the present invention. The screen member 15 is configured by stacking one or more filters 22 finer than the transmission holes 11. For example, the filter 22 is composed of three layers of 20 mesh, 100 mesh, and 20 mesh fibers. Moreover, the 100-mesh filter of the intermediate layer can be changed in the range of 60 to 200 mesh. Furthermore, the filter 22 may be a single layer or two layers. The filter 22 is formed in a truncated cone shape with a bottom, and an annular reinforcing plate 23 having a bolt hole 23a is disposed on a small-diameter bottom surface 22a that forms a closed end. An annular reinforcing ring 24 is disposed on the outer periphery of the large-diameter opening end 22b, and a fixing bolt hole 24a is formed.

  FIG. 6 is an explanatory view showing the reinforced inner cylinder 14 used in the strainer 10 of the present invention, and FIG. 7 is an enlarged cross-sectional view of the main part showing the bottom thereof. Here, the reinforcing inner cylindrical body 14 is formed of a stainless steel or the like that is formed in a truncated cone shape and in which the transmission holes 13 are provided on substantially the entire circumference. The transmission hole 13 is formed, for example, by punching holes in the plate member at a predetermined interval. A transmission hole 13 is also formed in the bottom surface 14a. In the vicinity of the periphery of the bottom surface 14a, bolt holes 25 are formed at positions corresponding to the bolt holes 23a formed on the bottom surface of the screen member 15. Further, a stepped portion 26 is formed on the outer periphery of the bottom portion of the reinforced inner cylinder 14, and is easily fixed to the inner periphery of the bottom portion of the screen member 15 when mounted in the screen member 15. Further, a bolt hole 28 for fixing the fixing ring 27 and the annular flange 18 is formed in the vicinity of the opening (upper end) 14b of the reinforcing inner cylinder 14.

  FIG. 8 is a cross-sectional view showing a fixing ring 27 used in the strainer of the present invention. The fixing ring 27 includes a cylindrical portion 27a attached to the opening 14b of the reinforcing inner cylindrical body 14 and a flange portion 27b protruding in the outer peripheral direction. The cylindrical inner portion 27a has a reinforcing inner cylindrical body. A bolt hole 27c is formed in order to integrally hold the screen 14, the screen member 15, and the reinforcing outer cylinder 12. When the fixing ring 27 configured as described above is mounted on the inner periphery of the annular flange 18, the flange portion 27 b engages with a step portion 18 a formed on the inner periphery of the annular flange 18.

  Next, an assembly procedure of the strainer 10 configured as described above will be described. First, as shown in FIG. 4, an annular flange 18 is attached to the upper end opening, and a screen member 15 is mounted inside a reinforcing outer cylinder 12 having a guide rib 16 attached to the outer periphery of the lower end. 14 is mounted. Further, as shown in FIG. 10, the fixing ring 27 is mounted from the upper end of the reinforced inner cylinder 14 so that the positions of the respective bolt holes 21, 24 a, 27 c, and 28 coincide with each other, and the reinforced inner cylinder 14 with the bolt 29. The screen member 15 and the reinforcing outer cylinder 12 are fixed to the annular flange 18 so as to be integrated.

  Further, as shown in FIG. 9, the bottom surface portion is screwed with a bolt 30 from below to fix the screen member 15 between the reinforcing outer cylinder 12 and the reinforcing inner cylinder 14.

  The strainer 10 configured as described above is a manifold that forms the base of the liquefied natural gas passage when loading the liquefied natural gas transport tanker as shown in FIG. 11 or when unloading the liquefied natural gas from the tanker. 31 is attached by a fixing hole 20 formed in the handle member 19. The strainer 10 is fixed to the peripheral edge of the flange portion 31a of the manifold 31 by tightening bolts and nuts with the bottom surface 12a to which the guide rib 16 and the guide plate 17 are attached as the back end and the large-diameter opening portion 12c as the front side. A loading arm 32 is connected to the opening side of the strainer 10.

  When loading liquefied natural gas from a complex to a tanker, as shown by the arrow A direction in FIG. 11, the connected loading arm 32 conveys the collected liquefied natural gas through a pipeline outside the figure. To do. The transported liquefied natural gas passes through the strainer 10 and flows into the manifold 31, and is loaded into the LNG tank of the tanker via a transport pipe (not shown) connected to the manifold 31. Further, the strainer 10 allows the liquefied natural gas to flow into the inside through the opening 12c and passes through the net-like screen member 15, and filters the liquefied natural gas to be discharged to remove the contained garbage.

  In addition, when unloading liquefied natural gas from a tanker, the strainer 10 removes garbage by passing the liquefied natural gas from the bottom surface 12a in the direction of arrow B to the opening 12c and passing through the net-like screen member 15. To do. Since the screen member 15 is pressed by the reinforcing inner and outer cylinders (punching metal) in the front and rear in the passage direction of the liquefied natural gas, it is possible to prevent the screen from being wrinkled or broken. Furthermore, because the front and rear of the liquefied natural gas passage are pressed by reinforcing inner and outer cylinders (punching metal), the screen will not be greatly deformed even when subjected to a large load (pressure) during filtration. Gas can flow in either direction. The liquefied natural gas from which the trash has been removed is unloaded into a liquefied natural gas storage tank in the factory via a loading arm 32 and a pipeline (not shown) connected to the loading arm.

  Since the strainer 10 can be easily disassembled as shown in FIG. 4, it is possible to easily check and repair the clogged or broken state of the screen member 15.

  In the above embodiment, the case where the diameters of the transmission holes 11 formed in the reinforcing outer cylinder 12 and the transmission holes 13 formed in the reinforcing inner cylinder 14 are the same has been described. The hole diameter may be larger than that of the transmission hole 13. Conversely, the hole diameter of the transmission hole 13 may be formed larger.

FIG. 1 is a front view showing an embodiment of a strainer according to the present invention. FIG. 2 is a bottom view of the strainer. FIG. 3 is a longitudinal sectional view of the strainer. FIG. 4 is an exploded perspective view of the strainer. FIG. 5 is a sectional view showing a screen member used in the strainer. FIG. 6 is an explanatory view showing a reinforcing inner cylinder used in the strainer. FIG. 7 is an enlarged cross-sectional view of the main part showing the bottom of the reinforced inner cylinder. FIG. 8 is a cross-sectional view showing a fixing ring used in the strainer. FIG. 9 is a cross-sectional view of the main part of the bottom part showing the assembled state of the strainer. FIG. 10 is a cross-sectional view of the main part in the vicinity of the opening showing the assembled state of the strainer. FIG. 11 is an explanatory view showing a use state of the strainer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Strainer 11 Transmission hole 12 Reinforcement outer cylinder 12a Bottom surface 12b Bolt hole 12c Opening part 13 Transmission hole 14 Reinforcement inner cylinder body 14a Bottom surface 14b Opening part 15 Screen member 16 Guide rib 17 Guide plate 18 Annular flange 18a Step part 19 Handle member 20 Fixation Hole 21 Bolt hole 22 Filter 23 Reinforcement plate 23a Bolt hole 24 Reinforcement ring 24a Bolt hole 25 Bolt hole 26 Step portion 27 Fixing ring 28 Bolt hole 29 Bolt 30 Bolt 31 Manifold 32 Loading arm

Claims (5)

When unloading liquefied natural gas from a liquefied natural gas transport tanker, or when loading into a transport tanker, a strainer that is attached to the base of the liquefied natural gas flow path on the tanker side,
A bottomed reinforcing outer cylinder having a plurality of perforations formed therein;
A bottomed reinforced inner cylinder with a plurality of perforations, and
A screen member having a finer filter than the transmission hole,
A strainer comprising the screen member sandwiched between the reinforcing outer cylinder and the reinforcing inner cylinder.   The strainer according to claim 1, wherein the screen member is a bottomed cylindrical body.   The strainer according to claim 1 or 2, wherein the reinforcing outer cylindrical body and the reinforcing inner cylindrical body are formed in a truncated cone shape whose diameter is reduced toward the bottom.   The strainer according to any one of claims 1 to 3, wherein an opening of the reinforcing outer cylinder, the reinforcing inner cylinder, and the screen member is fixed to an annular flange.   The strainer according to any one of claims 1 to 4, wherein a plurality of guide ribs project in a radial direction on the outer periphery of the bottom portion of the reinforced outer cylinder whose diameter is reduced.

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