Sealing member and submerged pump system

Abstract

This invention provides a sealing member and a submersible pump system capable of suppressing residual gas leakage during pump lifting and lowering. The sealing member 3 of this invention seals the open end 2a of the pump column 2 and suspends and supports the pump when the pump 5 is lifted and lowered. The sealing member includes: a cover plate 10 having a through hole 11 and installed at the open end; a lifting shaft 20 passing through the through hole and lifting and lowering between a rising position and a falling position during pump lifting and lowering; and a telescopic member 30 that extends and retracts according to the lifting and lowering of the lifting shaft. The telescopic member includes: a telescopic cylinder 31 covering the outer peripheral surface of a protruding portion of the lifting shaft extending upward from the cover plate; a first mounting member 32 continuously disposed with the upper end 31a of the telescopic cylinder and mounted on the upper end surface 21b of the lifting shaft; and a second mounting member 33 continuously disposed with the lower end 31b of the telescopic cylinder and mounted on the upper surface 10a of the cover plate.

Description

Technical Field

[0001] This invention relates to a sealing component and a submersible pump system. Prior Technology

[0002] A submersible pump system is used to extract liquefied gases (liquefied natural gas, liquefied ammonia, etc.) from a storage tank (see, for example, Patent Document 1). The pump (submersible pump) of the submersible pump system is housed in a pump column extending from the top plate of the storage tank into the liquefied gas and is immersed in the liquefied gas. A foot valve, which opens by the pump's own weight, is installed at the lower end of the pump column. The upper end of the pump column is liquid-tightly sealed by a cover plate. A lifting shaft for raising and lowering the pump passes through the cover plate and is mounted on it. The lifting shaft and the cover plate are liquid-tightly sealed by a sealing material (e.g., a gland seal).

[0003] In submersible pump systems, for example, the pump may be removed from the storage tank for maintenance. When the pump stops, the pump column is filled with residual liquefied gas and vaporized liquefied gas (vaporized gas). If the cover is removed in this state, there is a technical challenge of leakage of liquefied gas and vaporized gas (hereinafter collectively referred to as "residual gas") to the outside. Most residual gases are flammable or toxic, therefore, residual gases must be removed before removing the cover.

[0004] The residual gas removal system uses a method of introducing inert gases such as nitrogen into the pump column with the foot valve closed. In this method, before introducing the inert gas, the pump is raised by a lifting shaft to close the foot valve. At this time, because the foot valve is closed by raising the lifting shaft, the previous tightness of the sealing material is weakened. As a result, the sealing performance of the sealing material decreases, and a small amount of residual gas may leak to the outside through the gaps in the sealing material. [Previous Technical Documents] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-132619 Summary of the Invention

[0006] [The problem that the invention aims to solve] The present invention aims to provide a sealing component and a submersible pump system that can suppress residual gas leakage during pump lifting and lowering. [Methods for solving problems]

[0007] In one embodiment of the present invention, a sealing member seals the open end of a cylindrical pump column containing a pump immersed in a treatment liquid, and suspends and supports the pump when it is raised or lowered within the pump column. The sealing member comprises: a cover plate having a through hole extending in the vertical direction and installed at the open end to block the open end; a lifting shaft disposed through the through hole and raised or lowered between a rising position and a falling position when the pump is raised or lowered; and a telescopic member that extends or retracts along the axial direction of the lifting shaft according to the raising or lowering of the lifting shaft. The telescopic member comprises: a telescopic cylinder covering the outer peripheral surface of a protruding portion of the lifting shaft that protrudes upward from the cover plate; a first mounting member continuously disposed with the upper end of the telescopic cylinder and mounted on the upper end surface of the lifting shaft; and a second mounting member continuously disposed with the lower end of the telescopic cylinder and mounted on the upper surface of the cover plate.

[0008] One embodiment of the present invention includes a submersible pump system comprising: a pump immersed in a treatment liquid; a cylindrical pump column housing the aforementioned pump; and the aforementioned sealing member. [Effects of the Invention]

[0009] The present invention provides a sealing component and a submersible pump system capable of suppressing residual gas leakage during pump lifting and lowering. Simple Explanation of the Diagram

[0010] Figure 1 is a schematic cross-sectional view showing an embodiment of the submersible pump system of the present invention. Figure 2 is a schematic cross-sectional view showing an embodiment of the sealing member of the present invention. Figure 3 is a schematic dissected view of the sealing component in Figure 2. Figure 4 is a schematic cross-sectional view of the sealing member in Figure 2 when the lifting shaft is in the rising position. Figure 5 is a schematic cross-sectional view showing a modified example of the sealing member of the present invention. Implementation

[0011] The following description, with reference to the accompanying drawings, outlines embodiments of the sealing member and submersible pump system of the present invention. In each drawing, the same symbols are used to denote the same components and elements, and repeated descriptions are omitted. Furthermore, in each drawing, to clearly show the composition of each component, the shape and size of each component are schematically emphasized compared to their actual dimensions.

[0012] In the following explanations and diagrams, "below" refers to the direction of gravity, and "above" refers to the opposite direction of below.

[0013] ●Submersible Pump System● First, the implementation of the submersible pump system of the present invention will be described.

[0014] ●Composition of a submersible pump system Figure 1 is a schematic cross-sectional view showing an embodiment of the submersible pump system of the present invention.

[0015] The submersible pump system 1 is installed in a storage tank T containing liquefied gas Lg, and transports the liquefied gas Lg from the storage tank T to the outside. The submersible pump system 1 includes a pump column 2, a sealing component 3, a support cable 4, a submersible pump (hereinafter referred to as "pump") 5, a foot valve 6, and a collar 7. In this embodiment, the liquefied gas Lg is liquefied ammonia. Liquefied ammonia is one example of the processing liquid in this invention.

[0016] Furthermore, in this invention, the processing liquid is not limited to liquefied ammonia. That is, for example, the processing liquid can also be liquefied natural gas.

[0017] Pump column 2 houses pump 5 and also functions as a liquid transport path for the liquefied gas Lg discharged from pump 5. Pump column 2 is cylindrical in shape. Pump column 2 is configured to pass through the top plate T1 of storage tank T and extends from the top plate T1 into the liquefied gas Lg. A liquid transport path R1 for liquefied gas Lg is connected to the upper outer circumference of pump column 2.

[0018] The sealing member 3 liquid-tightly seals the upper opening end 2a of the pump column 2, and simultaneously suspends and supports the pump 5 via the support cable 4 when the pump 5 is raised or lowered within the pump column 2. The sealing member 3 is an example of the sealing member of the present invention, and its specific configuration is described below.

[0019] When the pump 5 is raised and lowered within the pump column 2, the support cable 4 suspends and supports the pump 5. The support cable 4 is, for example, made of metal wire. The support cable 4 is connected to the lifting shaft 20 and the pump 5, which will be described later.

[0020] Pump 5 discharges the liquefied gas Lg flowing in from the bottom valve 6 into the pump column 2. Pump 5 is, for example, a conventional submersible pump consisting of a multi-stage centrifugal pump and a motor driving the multi-stage centrifugal pump. The power to pump 5 is supplied via a power cable (not shown) connected to the sealing member 3. Pump 5 is housed in the lower part of pump column 2 and is immersed in the liquefied gas Lg.

[0021] The bottom valve 6 opens and closes the lower opening end 2b of the pump column 2. When the pump 5 is housed in the lower part of the pump column 2, the bottom valve 6 is opened by the weight of the pump 5 itself, and when the pump 5 is lifted, it is closed by the spring force of the spring (not shown in the figure).

[0022] The collar 7 secures the lifting shaft 20, described later, to the raised position. The collar 7 is formed by two semi-cylindrical components 7a and 7b. That is, the collar 7 can be disassembled into two semi-cylindrical components 7a and 7b. The collar 7 is a maintenance component used when removing the pump 5; it is not used during pump 5 operation. Therefore, in Figure 1, the collar 7 is indicated by a dashed line.

[0023] ●Composition of sealing components Next, the specific structure of the sealing member 3 (the sealing member of the present invention) will be described.

[0024] Figure 2 is a schematic cross-sectional view showing an embodiment of the sealing member 3. Figure 3 is a schematic dissected view of the sealing component 3. Figure 2 shows the sealing member 3 when the lifting shaft 20 (described later) is in the lowered position. Also, for ease of explanation, Figure 2 also shows the upper part of the pump column 2. Furthermore, in the following description, the bolt holes corresponding to bolts B1 to B5 (described later) are conventional technology, and therefore their description is omitted. Refer appropriately to Figure 1 in the following description.

[0025] The "lowering position" is the position where the lifting shaft 20 is lowered and its downward movement is restricted by the cover plate 10 (described later) (the position shown in Figure 2). The "rising position" is the position where the lifting shaft 20 is raised and the collar 7 can be installed on the sealing member 3 (the position shown in Figure 4). In this embodiment, the rising position is the position where the upward movement of the lifting shaft 20 is restricted by the movement restriction member 90 (described later).

[0026] The sealing component 3 includes a cover plate 10, a lifting shaft 20, a telescopic component 30, an upper sealing component 40, a lower sealing component 50, a shaft sealing component 60, a housing 70, a shaft fixing component 80, a movement limiting component 90, multiple plate mounting bolts B1, multiple telescopic component mounting bolts B2, multiple housing mounting bolts B3, multiple cover mounting bolts B4, and multiple pressing bolts B5.

[0027] The cover plate 10 functions as a cover, blocking the upper opening 2a of the pump column 2. The cover plate 10 is, for example, a circular plate. The cover plate 10 is made of metal such as stainless steel. The cover plate 10 has an insertion hole 11, a sealing groove 12, and a guide member 13.

[0028] The through hole 11 is a through hole that extends through the cover plate 10 in the vertical direction. That is, the through hole 11 extends in the vertical direction within the cover plate 10. The through hole 11 is disposed in the center of the cover plate 10. The through hole 11 is an example of a through hole in the present invention. The through hole 11 has a first hole portion 11a and a second hole portion 11b.

[0029] The first hole 11a is a circular hole. When the lifting shaft 20 is in the lowered position, the lower part of the first shaft portion 21 of the lifting shaft 20 (described later) is inserted into the first hole 11a. The second hole 11b is a circular hole through which the second shaft portion 22 of the lifting shaft 20 (described later) is inserted. The first hole 11a is continuously disposed above the second hole 11b. The first hole 11a and the second hole 11b are arranged concentrically. The inner diameter of the first hole 11a is larger than the inner diameter of the second hole 11b.

[0030] The lower part of the second hole 11b is expanded in two stages to form the embedded part 11c, and the guide member 13 is embedded in the embedded part 11c.

[0031] The sealing groove 12 is an annular groove for the shaft sealing member 60. The sealing groove 12 is concentric with the bottom surface 11d of the first hole 11a.

[0032] The guide member 13 guides the lifting and lowering of the lifting shaft 20. The guide member 13 is cylindrical with a flange at its lower end. The guide member 13 is inserted into the insertion portion 11c of the second hole 11b. The inner diameter of the guide member 13 is approximately the same as the inner diameter of the second hole 11b. The dimensional tolerance (clearance) of the inner diameter of the guide member 13 is smaller than the dimensional tolerance of the inner diameter of the second hole 11b compared to the outer diameter of the lifting shaft 20 (the second shaft portion 22 described later).

[0033] The lifting shaft 20 moves between the rising position and the falling position when the pump 5 is raised and lowered, and supports the pump 5 via the support cable 4. The lifting shaft 20 includes a first shaft portion 21, a second shaft portion 22, a first connecting structural member 23, a second connecting structural member 24, and a nut component 25.

[0034] The first shaft portion 21 restricts the lifting shaft 20 from moving to a position lower than the lowered position. The second shaft portion 22, together with the second hole portion 11b of the cover plate 10, guides the lifting shaft 20. The first shaft portion 21 and the second shaft portion 22 are cylindrical in shape, elongated in the vertical direction. The first shaft portion 21 is continuously arranged above the second shaft portion 22 and forms an integral part with the second shaft portion 22. That is, the first shaft portion 21 and the second shaft portion 22 constitute a single shaft. The first shaft portion 21 and the second shaft portion 22 are arranged concentrically. The outer diameter of the first shaft portion 21 is larger than the outer diameter of the second shaft portion 22 and slightly smaller than the inner diameter of the first hole portion 11a. The outer diameter of the second shaft portion 22 is slightly smaller than the inner diameter of the second hole portion 11b and the guide member 13.

[0035] The first shaft portion 21 has an internal threaded hole 21a. The internal threaded hole 21a opens along the vertical direction on the upper end face 21b of the first shaft portion 21.

[0036] The second shaft portion 22 has a first internal threaded hole 22a and a second internal threaded hole 22b. The first internal threaded hole 22a opens along the vertical direction on the lower end face 22c of the second shaft portion 22. The second internal threaded hole 22b opens along the horizontal direction on the outer peripheral surface of the lower part of the second shaft portion 22.

[0037] The first connecting component 23 is a member that connects to a cable (not shown in the figure) from the elevator (not shown in the figure) when the pump 5 is raised or lowered. The first connecting component 23 has an annular connecting portion 23a and an externally threaded portion 23b extending downward from the connecting portion 23a. The first connecting component 23 is installed on the upper end of the first shaft portion 21 by screwing the externally threaded portion 23b into the internally threaded hole 21a.

[0038] The second connecting member 24 is a component connected to the support cable 4. The second connecting member 24 has an annular connecting portion 24a and an externally threaded portion 24b extending upward from the connecting portion 24a. The second connecting member 24 is installed at the lower end of the second shaft portion 22 by screwing the externally threaded portion 24b into the first internally threaded hole 22a.

[0039] The nut component 25 pushes the first mounting component 32 (described later) toward the upper end face 21b of the first shaft portion 21. The nut component 25 is mounted on the external thread portion 23b of the first connecting member 23.

[0040] The lifting shaft 20 is inserted into the through hole 11 of the cover plate 10 from above and is configured to pass through the through hole 11. The lifting shaft 20 can move up and down between the lowering position and the rising position when the pump 5 is raised and lowered. The second shaft 22 is guided by the guide member 13, thereby allowing the lifting shaft 20 to move up and down smoothly without loosening.

[0041] When the lifting shaft 20 is in the lowered position, the lower part of the first shaft portion 21 is inserted into the first hole portion 11a, and the second shaft portion 22 is inserted through the second hole portion 11b and the guide member 13. At this time, the first shaft portion 21 protrudes upward relative to the cover plate 10, while the second shaft portion 22 protrudes downward (inside the pump column 2) relative to the cover plate 10. On the other hand, when the lifting shaft 20 is in the raised position, the first shaft portion 21 is located above the cover plate 10. The second shaft portion 22 is inserted through the first hole portion 11a, the second hole portion 11b, and the guide member 13, and protrudes vertically relative to the cover plate 10.

[0042] The telescopic member 30 extends and retracts along the axial direction (vertical direction) of the lifting shaft 20, and simultaneously provides a liquid-tight seal between the cover plate 10 and the lifting shaft 20. The telescopic member 30 includes a telescopic cylinder 31, a first mounting member 32, and a second mounting member 33.

[0043] The telescopic cylinder 31 extends and retracts according to the lifting shaft 20. The telescopic cylinder 31 is a continuous cylindrical telescopic component with an annular mountain and valley section in the vertical direction. The telescopic cylinder 31 is made of metal such as stainless steel. The inner diameter of the telescopic cylinder 31 (the inner diameter of the valley section) is larger than the outer diameter of the first shaft portion 21 of the lifting shaft 20. Furthermore, the outer diameter of the telescopic cylinder 31 when extended (the outer diameter of the mountain section) is smaller than the inner diameter of the collar 7.

[0044] The first mounting member 32 mounts the telescopic cylinder 31 to the lifting shaft 20. The first mounting member 32 is continuously positioned above the telescopic cylinder 31 and at its upper end 31a. The first mounting member 32 is ring-shaped. The first mounting member 32 has a through hole 32a and a sealing groove 32b. The outer diameter of the first mounting member 32 is larger than the outer diameter of the telescopic cylinder 31.

[0045] The through hole 32a is a through hole that extends through the first mounting member 32 in the vertical direction. The through hole 32a is located at the center of the first mounting member 32. The inner diameter of the through hole 32a is smaller than the outer diameter of the first shaft portion 21.

[0046] The sealing groove 32b is an annular groove provided with the upper sealing member 40. The sealing groove 32b is concentric with the through hole 32a on the lower surface 32c of the first mounting member 32.

[0047] The second mounting member 33 mounts the telescopic cylinder 31 onto the cover plate 10. The second mounting member 33 is ring-shaped. The second mounting member 33 is continuously disposed below the telescopic cylinder 31 and at the lower end 31b of the telescopic cylinder 31. The second mounting member 33 has a through hole 33a.

[0048] The through hole 33a is a through hole that extends through the second mounting member 33 in the vertical direction. The through hole 33a is located in the center of the second mounting member 33.

[0049] The upper end 31a of the telescopic cylinder 31 is liquid-tightly fused to the lower surface 32c of the first mounting member 32 along its entire circumference. The lower end 31b of the telescopic cylinder 31 is liquid-tightly fused to the upper surface 33b of the second mounting member 33 along its entire circumference. As a result, the telescopic cylinder 31, the first mounting member 32, and the second mounting member 33 are integrally formed. In the radial direction of the first mounting member 32, the sealing groove 32b is positioned further inward than the upper end 31a of the telescopic cylinder 31.

[0050] The second mounting member 33 is fastened to the cover plate 10 by the telescopic member mounting bolt B2, thereby installing the telescopic member 30 onto the upper surface 10a of the cover plate 10. The telescopic cylinder 31 accommodates the portion of the lifting shaft 20 that protrudes upward from the cover plate 10 (hereinafter referred to as the "protruding portion") and covers its outer peripheral surface. The protruding portion changes according to the lifting shaft 20's movement; the protruding portion in the lowered position is part of the first shaft portion 21, and the protruding portion in the raised position is the entire first shaft portion 21 and part of the second shaft portion 22. A space (hereinafter referred to as the "telescopic member internal space S") is formed between the telescopic cylinder 31 and the lifting shaft 20, enclosed by the telescopic cylinder 31. The telescopic member internal space S allows the inner diameter (outer diameter) of the telescopic cylinder 31 to change as the telescopic cylinder 31 extends and retracts.

[0051] The external threaded portion 23b of the first connecting member 23 is inserted into the through hole 32a. The connecting portion 23a of the first connecting member 23 and the nut member 25 are arranged above the first mounting member 32. By locking the nut member 25 which abuts against the upper surface 32d of the first mounting member 32, the first mounting member 32 is pushed downward (first shaft portion 21).

[0052] The upper sealing member 40 is, for example, an O-ring made of fluororesin. The upper sealing member 40 is disposed in the sealing groove 32b of the first mounting member 32. The upper sealing member 40 is positioned between the upper end face 21b of the first shaft portion 21 of the lifting shaft 20 and the lower surface 32c (sealing groove 32b) of the first mounting member 32, providing a liquid-tight seal between them. The sealing performance of the upper sealing member 40 depends on the tightening force of the nut member 25. That is, if the nut member 25 is loosened, the sealing performance decreases; if the nut member 25 is tightened, the sealing performance increases.

[0053] The lower sealing member 50 is, for example, a gasket made of fluoropolymer. The lower sealing member 50 is disposed between the upper surface 10a of the cover plate 10 and the lower surface 33c of the second mounting member 33, providing a liquid-tight seal between them. The sealing performance of the lower sealing member 50 depends on the tightening force of the expansion joint mounting bolt B2. That is, if the expansion joint mounting bolt B2 is loosened, the sealing performance decreases; if the expansion joint mounting bolt B2 is tightened, the sealing performance increases.

[0054] The shaft sealing member 60 is, for example, an O-ring made of fluoropolymer. The shaft sealing member 60 is disposed in the sealing groove 12 of the cover plate 10. When the lifting shaft 20 is in the lowered position, the shaft sealing member 60 is disposed between the bottom surface 11d (sealing groove 12) of the first hole 11a of the cover plate 10 and the lower end surface 21c of the first shaft portion 21 of the lifting shaft 20, liquid-tightly sealing the space between them. The sealing performance of the shaft sealing member 60 depends on the tightening force of the pressing bolt B5, described later. That is, if the pressing bolt B5 is loosened, the sealing performance decreases; if the pressing bolt B5 is tightened, the sealing performance increases.

[0055] When the lifting shaft 20 is in the lowered position, the housing 70 accommodates the first shaft portion 21 and the telescopic member 30. The housing 70 includes a cylindrical portion 71, a first flange portion 72, a second flange portion 73, and a cover portion 74.

[0056] The cylindrical body 71 is cylindrical in shape. The inner diameter of the cylindrical body 71 is larger than the outer diameter (outer diameter of the mountain part) of the telescopic cylinder 31, and also larger than the inner diameter of the collar 7. The inner surface of the lower end of the cylindrical body 71 is enlarged to form a receiving portion 71a that accommodates the second mounting member 33, the lower sealing member 50, and the telescopic mounting bolt B2. In the radial direction of the cylindrical body 71, the upper end of the cylindrical body 71 protrudes outward to form a ring-shaped first flange portion 72. The lower end of the cylindrical body 71 protrudes outward to form a ring-shaped second flange portion 73. That is, the cylindrical body 71, the first flange portion 72, and the second flange portion 73 are integrally formed.

[0057] The cover 74 protects the inside of the cylindrical body 71 from wind and rain. The cover 74 is cap-shaped. The cover 74 is fastened to the first flange 72 of the cylindrical body 71 by the cover mounting bolt B4, thereby covering the upper opening of the cylindrical body 71.

[0058] The second flange 73 is fastened to the cover plate 10 by the housing mounting bolt B3, thereby installing the housing 70 on the upper surface 10a of the cover plate 10. At this time, the second mounting member 33, the lower sealing member 50 and the telescopic member mounting bolt B2 are accommodated in the receiving part 71a.

[0059] When the lifting shaft 20 is in the lowered position, the shaft fixing member 80 fixes the lifting shaft 20 in the lowered position. The shaft fixing member 80 has a peripheral wall portion 81 and a flange portion 82.

[0060] The peripheral wall portion 81 is cylindrical. The outer diameter of the peripheral wall portion 81 is approximately the same as the outer diameter (outer diameter of the mountain portion) of the telescopic cylinder 31. In the radial direction, the upper end of the peripheral wall portion 81 protrudes outward to form a ring-shaped flange portion 82. That is, the peripheral wall portion 81 and the flange portion 82 are integrally formed. The outer diameter of the flange portion 82 is larger than the outer diameter of the telescopic cylinder 31. The peripheral wall portion 81 is inserted into the cylinder portion 71. Without the shaft fixing member 80 being fastened to the housing 70 by the pressing bolt B5, in the vertical direction, the length of the portion of the peripheral wall portion 81 that is lower than the flange portion 82 is longer than the length between the upper end face 70a of the housing 70 and the upper surface 32d of the first mounting member 32. Therefore, the flange portion 82 does not abut against the upper end face 70a of the housing 70.

[0061] The flange 82 is fastened to the housing 70 by the pressing bolt B5, thereby fastening the shaft fixing member 80 to the housing 70. At this time, the first mounting member 32 is pushed downward by the pressing bolt B5 (towards the cover plate 10 and the lifting shaft 20). As a result, the first mounting member 32 pushes the lifting shaft 20 towards the cover plate 10 via the upper sealing member 40 and fixes it in the lowered position. Thus, when the lifting shaft 20 is in the lowered position, the shaft fixing member 80 pushes the lifting shaft 20 towards the cover plate 10 via the first mounting member 32 and the upper sealing member 40 and fixes it in the lowered position.

[0062] The movement limiting member 90 restricts the lifting shaft 20 from moving to a position higher than the raised position. The movement limiting member 90 is, for example, a bolt made of metal such as stainless steel. The movement limiting member 90 is screwed into the second internal threaded hole 22b of the second shaft portion 22. As a result, the movement limiting member 90 is positioned lower than the cover plate 10 and protrudes from the outer peripheral surface of the second shaft portion 22.

[0063] The sealing member 3 constructed in this manner is installed at the upper opening end 2a by fastening the cover plate 10 to the upper opening end 2a of the pump column 2 using plate mounting bolts B1. At this time, a gasket (not shown in the figure) is arranged between the upper opening end 2a and the cover plate 10 to liquid-tightly seal the cover plate 10 and the upper opening end 2a.

[0064] ●The sealing structure formed by the sealing components Next, referring to Figures 1 to 3, the sealing structure formed by the sealing member 3 will be described. The sealing member 3 has a sealing structure that prevents the liquefied gas Lg and the vaporized liquefied gas Lg (hereinafter referred to as "vaporized gas Vg" (see Figure 4; the same below)) inside the pump column 2 from leaking to the outside of the sealing member 3. The sealing structure is composed of a telescopic member 30, an upper sealing member 40, a lower sealing member 50, and a shaft sealing member 60. Regardless of whether the lifting shaft 20 is in the lowering position or the rising position, the sealing structure can prevent the liquefied gas Lg and the vaporized gas Vg from leaking to the outside of the sealing member 3.

[0065] The sealing structure of each position of the lifting shaft 20 will be explained below in conjunction with the operation of the sealing component 3 (mainly the lifting shaft 20).

[0066] During pump 5 operation, the liquefied gas Lg discharged from pump 5 rises within pump column 2 and is supplied to the outside of storage tank T via liquid delivery path R1. Pump column 2 is filled with liquefied gas Lg, and the discharge pressure from pump 5 (e.g., a maximum of 2 MPa) is applied to cover plate 10 and lifting shaft 20. At this time, lifting shaft 20 is in the lowered position and is fixed.

[0067] When the lifting shaft 20 is in the descending position, the liquefied gas Lg seeps into the gap between the second shaft portion 22 of the lifting shaft 20 and the guide member 13, but is blocked by the shaft sealing member 60 and will not leak into the space above the shaft sealing member 60 (the internal space S of the telescopic member). As a result, the aforementioned discharge pressure will not be transmitted to the telescopic member 30, the upper sealing member 40, and the lower sealing member 50.

[0068] Furthermore, when pump 5 stops operating, the liquefied gas Lg remains in pump column 2 at the same height as the liquefied gas Lg in storage tank T. Also, the space above the liquid surface in pump column 2 is filled with vaporized gas Vg. Even in this state, due to the aforementioned sealing structure (especially shaft seal member 60), vaporized gas Vg will not leak into the space above shaft seal member 60 (the internal space S of the telescopic member).

[0069] Pump 5 is periodically (e.g., every few years) removed from the pump column 2 for maintenance. When removing pump 5, the bottom valve 6 must be closed and any residual gas (liquefied gas Lg and vaporized gas Vg) inside the pump column 2 must be removed. As a preparation, pump 5 is raised to a predetermined height inside the pump column 2 by raising the lifting shaft 20 from the lowered position to the raised position.

[0070] As preparation for raising the lifting shaft 20, the cover 74 and shaft fixing member 80 are removed. As a result, the pressing of the pressing bolt B5 is released, and the sealing performance of the shaft sealing member 60 decreases. Therefore, residual gas may leak through the shaft sealing member 60 into the internal space S of the telescopic member. However, the internal space S of the telescopic member is liquid-tightly sealed by the telescopic member 30, the upper sealing member 40, and the lower sealing member 50. Therefore, residual gas will not leak from the internal space S of the telescopic member to the outside of the sealing member 3. In this embodiment, the treatment liquid is liquefied ammonia, and the vaporized gas Vg is ammonia gas, which is flammable and highly toxic to living organisms. Furthermore, ammonia gas is lighter than air, so it is easily inhaled by maintenance workers. The sealing member 3 of the present invention has a sealing structure using the telescopic member 30, and therefore can be applied to difficult-to-handle treatment liquids such as liquefied ammonia.

[0071] Next, a cable (not shown in the figure) from the elevator (not shown in the figure) is connected to the first connecting structure 23 of the lifting shaft 20, and the elevator lifts the lifting shaft 20 to the raised position. At this time, the pump 5 is suspended from the lifting shaft 20 via the support cable 4, and the bottom valve 6 is closed by the spring force of the spring (not shown in the figure).

[0072] Figure 4 shows a schematic cross-section of the sealing component 3 when the lifting shaft 20 is in the raised position. picture.

[0073] When the lifting shaft 20 is raised to the ascending position, the seal formed by the shaft sealing member 60 is released, and the internal space S of the telescopic member communicates with the space inside the pump column 2 through the insertion hole 11. Therefore, residual gas flows into the internal space S of the telescopic member through the insertion hole 11. At this time, the telescopic cylinder 31 extends as the lifting shaft 20 moves. Therefore, the sealing state of the telescopic member 30, the upper sealing member 40, and the lower sealing member 50 over the internal space S of the telescopic member is maintained. Therefore, residual gas will not leak from the internal space S of the telescopic member to the outside of the sealing member 3.

[0074] Furthermore, when the lifting shaft 20 is raised to the upward position, the movement limiting member 90 is abutted against the lower surface 10b of the cover plate 10 to limit the movement of the lifting shaft 20 to a position higher than the upward position. Therefore, the telescopic cylinder 31 will not be over-extended, and technical issues such as damage to the telescopic member 30 (telescopic cylinder 31 or weld joint) will not occur.

[0075] Furthermore, the outer diameter of the telescopic cylinder 31 during extension becomes smaller than that during retraction. On the other hand, as described above, the inner diameter of the collar 7 is larger than the outer diameter of the telescopic cylinder 31 during extension, but smaller than the inner diameter of the cylinder portion 71. Therefore, the collar 7 can be installed between the first mounting member 32 and the first flange portion 72 of the housing 70. When the collar 7 is installed between the first mounting member 32 and the first flange portion 72, the lifting shaft 20 is fixed in the raised position. At this time, the sealing member 3 is suspended and supports the pump 5.

[0076] When the lifting shaft 20 is in the raised position, the lower end face 21c of the first shaft portion 21 separates from the shaft sealing member 60, thus releasing the seal formed by the shaft sealing member 60. Therefore, residual gas flows into the internal space S of the telescopic member through the gap between the second shaft portion 22 and the through hole 11 (guide member 13). However, as described above, the sealing state of the telescopic member 30, the upper sealing member 40, and the lower sealing member 50 over the internal space S of the telescopic member is maintained. Therefore, residual gas will not leak from the internal space S of the telescopic member to the outside of the sealing member 3.

[0077] Next, inactive gas is introduced into pump column 2, allowing residual gas in pump column 2 to return to storage tank T. The subsequent removal of pump 5 is a known procedure, therefore its description is omitted.

[0078] ●Summary According to the embodiment described above, the sealing member 3 includes a cover plate 10, a lifting shaft 20, and a telescopic member 30. The cover plate 10 has an insertion hole 11 extending in the vertical direction and is installed on the upper opening end 2a of the pump column 2 in a manner that blocks the upper opening end 2a. The lifting shaft 20 is configured to pass through the insertion hole 11 and moves between the rising position and the falling position when the pump 5 is raised or lowered. The telescopic member 30 extends and retracts in the axial direction (vertical direction) of the lifting shaft 20 according to the raising and lowering of the lifting shaft 20. The telescopic member 30 includes a telescopic cylinder 31, a first mounting member 32, and a second mounting member 33. The telescopic cylinder 31 covers the outer peripheral surface of the protruding portion in the lifting shaft 20. The first mounting member 32 is continuously configured with the upper end 31a of the telescopic cylinder 31 and is mounted on the upper end surface 21b of the first shaft portion 21. The second mounting member 33 is continuously configured with the lower end 31b of the telescopic cylinder 31 and is mounted on the upper surface 10a of the cover plate 10. According to this configuration, the internal space S of the telescopic component is surrounded by the telescopic member 30. Therefore, even when the lifting shaft 20 moves up and down, the telescopic cylinder 31 will also extend and retract according to the movement of the lifting shaft 20, and the internal space S of the telescopic component is sealed by the telescopic member 30. In this way, the telescopic member 30 prevents leakage of liquefied gas Lg or residual gas when the pump 5 moves up and down in the sealing member 3.

[0079] Furthermore, according to the embodiment described above, the sealing member 3 has an upper sealing member 40 and a lower sealing member 50. The upper sealing member 40 is disposed between the first mounting member 32 and the upper end face 21b of the first shaft portion 21. The lower sealing member 50 is disposed between the second mounting member 33 and the upper surface 10a of the cover plate 10. With this configuration, the space between the first mounting member 32 and the upper end face 21b, and the space between the second mounting member 33 and the upper surface 10a are liquid-tightly sealed. As a result, the internal space S of the telescopic member is liquid-tightly sealed by the telescopic member 30, the upper sealing member 40, and the lower sealing member 50. Therefore, in the sealing member 3, the leakage of liquefied gas Lg or residual gas during the lifting and lowering of the pump 5 is prevented by the telescopic member 30, the upper sealing member 40, and the lower sealing member 50.

[0080] Furthermore, according to the embodiment described above, the sealing member 3 has a shaft sealing member 60 disposed between the cover plate 10 and the lifting shaft 20. The lifting shaft 20 has a first shaft portion 21 and a second shaft portion 22. The second shaft portion 22 has an outer diameter smaller than that of the first shaft portion 21, and is disposed at a lower position than the first shaft portion 21, and is inserted into the insertion hole 11. With this configuration, when the lifting shaft 20 is in the lowered position, the shaft sealing member 60 liquid-tightly seals the lower end face 21c of the first shaft portion 21 and the cover plate 10. As a result, when the lifting shaft 20 is in the lowered position, liquefied gas Lg or residual gas will not leak into the internal space S of the telescopic member. Also, the discharge pressure of the pump 5 will not be transmitted to the telescopic member 30. As a result, the sealing performance of the sealing member 3 is improved, and technical problems such as damage to the telescopic member 30 due to discharge pressure do not occur.

[0081] Furthermore, according to the embodiment described above, the insertion hole 11 includes a first hole portion 11a and a second hole portion 11b. The second hole portion 11b has a smaller inner diameter than the first hole portion 11a and is positioned lower than the first hole portion 11a. When the lifting shaft 20 is in the lowered position, the lower part of the first shaft portion 21 is inserted into the first hole portion 11a. The second shaft portion 22 is inserted into the second hole portion 11b. The shaft sealing member 60 is disposed between the lower end face 21c of the first shaft portion 21 and the bottom face 11d of the first hole portion 11a. With this configuration, when the lifting shaft 20 is in the lowered position, the shaft sealing member 60 liquid-tightly seals the lower end face 21c and the bottom face 11d. As a result, when the lifting shaft 20 is in the lowered position, liquefied gas Lg or residual gas will not leak into the internal space S of the telescopic member. Also, the discharge pressure of the pump 5 will not be transmitted to the telescopic member 30. As a result, the sealing performance of the sealing component 3 is improved, and technical issues such as damage to the telescopic component 30 due to discharge pressure do not occur.

[0082] Furthermore, according to the embodiment described above, the sealing member 3 includes a shaft fixing member 80 that fixes the lifting shaft 20 in the lowered position. The shaft fixing member 80 pushes the lifting shaft 20 towards the cover plate 10 side by pressing the bolt B5. With this configuration, even if the discharge pressure of the pump 5 is applied to the lifting shaft 20, the lifting shaft 20 can be fixed in the lowered position. Also, since the shaft sealing member 60 is pressed between the lower end face 21c of the first shaft portion 21 and the bottom face 11d of the first hole portion 11a, the sealing performance of the shaft sealing member 60 is improved.

[0083] Furthermore, according to the embodiment described above, the sealing member 3 has a movement limiting member 90 to restrict the lifting shaft 20 from moving to a position higher than the rising position. With this configuration, the telescopic cylinder 31 will not over-extend, and technical issues such as damage to the telescopic member 30 will not occur.

[0084] ●Other Implementation Forms● Furthermore, in this invention, the sealing member 3 may not include the shaft sealing member 60. With this configuration, the discharge pressure from the pump 5 can be transmitted to the telescopic member 30, and the leakage of liquefied gas Lg from the internal space S of the telescopic member is prevented by the telescopic member 30, the upper sealing member 40, and the lower sealing member 50. Also, in this configuration, for example, by making the lower end face 21c of the first shaft portion 21 in close contact with the bottom face 11d of the first hole portion 11a, the sealing between them is ensured to a certain extent, and the transmission of discharge pressure can also be suppressed.

[0085] Furthermore, in this invention, the configuration that seals the first mounting member 32 with the lifting shaft 20 is not limited to this embodiment. That is, for example, the first mounting member 32 can also be liquid-tightly mounted to the lifting shaft 20 by welding.

[0086] Furthermore, in this invention, the upper sealing member 40 is not limited to an O-ring. That is, for example, the upper sealing member 40 can also be a ring-shaped gasket.

[0087] Furthermore, in this invention, the sealing groove 32b of the upper sealing member 40 can also be disposed on the upper end surface 21b of the first shaft portion 21.

[0088] Furthermore, in this invention, the configuration for sealing the second mounting member 33 with the cover plate 10 is not limited to this embodiment. That is, for example, the second mounting member 33 can also be liquid-tightly mounted to the cover plate 10 by welding.

[0089] Furthermore, in this invention, the lower sealing member 50 is not limited to a gasket. That is, for example, the lower sealing member 50 can also be an annular O-ring. In this case, for example, the sealing groove on which the lower sealing member 50 is disposed can also be disposed on the upper surface 10a of the cover plate 10 or the lower surface 33c of the second mounting member 33.

[0090] Furthermore, in this invention, the telescopic cylinder 31 can also be integrally formed with the first mounting member 32 and / or the second mounting member 33. According to this configuration, the strength of the telescopic member 30 is increased.

[0091] Furthermore, in this invention, the through hole 11 may not have a first hole portion 11a. In this case, for example, the sealing groove 12 embedded by the shaft sealing member 60 may also be disposed on the upper surface 10a of the cover plate 10.

[0092] Furthermore, in this invention, the sealing groove 12 on which the shaft sealing member 60 is disposed can also be disposed on the lower end face 21c of the first shaft portion 21.

[0093] Furthermore, in this invention, the materials of the telescopic member 30, the upper sealing member 40, the lower sealing member 50, and the shaft sealing member 60 can be appropriately selected according to the processing fluid, and are not limited to this embodiment.

[0094] Furthermore, in this invention, the shaft formed by the first shaft portion 21 and the second shaft portion 22 can also have the same outer diameter from the top to the bottom. That is, for example, the shaft of the lifting shaft 20 can also be formed by only either the first shaft portion 21 or the second shaft portion 22. In this case, for example, the insertion hole 11 only needs to have an inner diameter through which the lifting shaft 20 can be inserted.

[0095] Furthermore, in this invention, an internal thread portion can be formed on the upper part of the inner circumferential surface of the cylindrical portion 71 of the housing 70, and an external thread portion that mates with the internal thread portion can be formed on the outer circumferential surface of the peripheral wall portion 81 of the shaft fixing member 80. With this configuration, the shaft fixing member 80 is screwed into the cylindrical portion 71, thereby allowing the shaft fixing member 80 to push the lifting shaft 20 downward.

[0096] Furthermore, in this invention, the sealing member 3 may not have the movement restriction member 90. In this case, for example, it is sufficient to pre-set the height of the rising position.

[0097] Furthermore, in this invention, the configuration of the movement limiting member 90 is not limited to this embodiment. That is, for example, the movement limiting member 90 may also be composed of a top pin embedded in the lifting shaft 20. Also, for example, the movement limiting member 90 may also be composed of a slide rail with a stop block disposed between the first mounting member 32 and the second mounting member 33.

[0098] Furthermore, in this invention, the cover plate 10 may not have the guide member 13. In this case, for example, the second hole portion 11b may also have the same function as the guide member 13.

[0099] Furthermore, in this invention, the lifting shaft 20 may not be in the raised position, but rather in a holding position located lower than the raised position, and may be fixed by the collar 7. In this case, the lifting shaft 20 is raised to the raised position, and after the collar 7 is configured, it is lowered to the holding position. With this configuration, it becomes easier to configure the collar 7.

[0100] Furthermore, in this invention, a gas path capable of introducing inactive gas into the internal space S of the telescopic member can also be connected to the telescopic member 30. In this case, for example, the gas path can also be connected to the first mounting member 32. According to this configuration, when the lifting shaft 20 is lowered to the lowered position, the liquefied gas Lg or vaporized gas Vg remaining in the internal space S of the telescopic member will be released into the pump column 2. Moreover, by introducing inactive gas into the pump column 2 and the internal space S of the telescopic member at the same time, residual gas will not remain in the internal space S of the telescopic member.

[0101] Furthermore, in this invention, the insertion hole 11 and the guide member 13 may also have a vent groove, which allows the internal space S of the telescopic member to bypass the space inside the pump column 2 when the pressing bolt B5 is released from pressing the shaft seal member 60. In this configuration, air can easily flow into and out of the internal space S of the telescopic member. As a result, the telescopic cylinder 31 can easily extend and retract.

[0102] Furthermore, in this invention, when the flange 82 is fastened to the housing 70 by the pressing bolt B5, the flange 82 may abut against the upper end face 70a of the housing 70, or it may not abut against it. In the former case, the force (pressing force) of the shaft fixing member 80 pressing the first mounting member 32 is uniform in the circumferential direction of the shaft fixing member 80. Also, even if the shaft fixing member 80 is installed and removed multiple times, the pressing force is approximately the same each time. On the other hand, in the latter case, the pressing force can be adjusted, for example, according to the state of the shaft sealing member 60.

[0103] Furthermore, in this invention, the first mounting member 32 can also be integrally formed with the shaft fixing member 80.

[0104] Figure 5 is a schematic cross-sectional view showing a modified example of the sealing member of the present invention. This figure shows the sealing member 3A of this modified example when the lifting shaft 20 is in the raised position. Furthermore, this figure shows that the telescopic member 30A of the sealing member 3A of this modified example includes a first mounting member 34, which has a shape that integrally forms the first mounting member 32 and the shaft fixing member 80 from the previously described embodiment (both refer to Figure 2). Moreover, in this figure, to clearly show the first mounting member 34, only the cross-section of the first mounting member 34 is painted gray. The differences between this modified example and the previously described embodiment will be explained below.

[0105] In this modified example, the first mounting member 34 includes: an annular plate-shaped bottom 34a; a cylindrical peripheral wall portion 34b extending upward from the outer edge of the bottom 34a; and an annular plate-shaped flange portion 34c protruding outward from the upper end of the peripheral wall portion 34b in the radial direction of the bottom 34a. The bottom 34a is continuously disposed above the upper end 31a of the telescopic cylinder 31. The upper end 31a of the telescopic cylinder 31 is liquid-tightly fused to the lower surface 34d of the bottom 34a along the entire circumference of the telescopic cylinder 31. A sealing groove 32b is disposed on the lower surface 34d of the bottom 34a. The outer diameter of the flange portion 34c is larger than the outer diameter (outer diameter of the top part) of the telescopic cylinder 31. According to this configuration, in the lifting shaft When the lifting shaft 20 is in the raised position, the flange 34c protrudes further outward than the telescopic cylinder 31 in the radial direction of the bottom 34a. Therefore, the lifting shaft 20 is fixed in the raised position by installing a cylindrical collar 7A between the flange 34c and the first flange 72 of the housing 70. The collar 7A is composed of two semi-cylindrical components 7Aa and 7Ab. The inner diameter of the collar 7A is larger than the outer diameter of the peripheral wall 34b and smaller than the outer diameter of the flange 34c. By installing the collar 7A between the flange 34c and the first flange 72, the cover plate 10 can be removed from the upper opening end 2a when the lifting shaft 20 is fixed in the raised position (when the pump 5 is raised).

[0106] Furthermore, in this modified example, the cylindrical portion 71, the first flange portion 72, and the second flange portion 73 of the housing 70 can also be divided into two halves along the vertical direction. According to this configuration, after the first mounting member 34 and the second mounting member 33 are welded to the telescopic cylindrical portion 31, the cylindrical portion 71 can accommodate the telescopic member 30.

[0107] ●Implementation Methods of the Invention● Next, referring to the terms and symbols described in the embodiments, the embodiments of the present invention as understood from the above description will be explained below.

[0108] The first embodiment of the present invention is a sealing member (e.g., sealing member 3, 3A) that seals the open end (e.g., upper open end 2a) of a cylindrical pump column (e.g., pump column 2) housing a pump (e.g., liquefied gas lg) immersed in a processing liquid (e.g., liquefied gas lg), and suspends and supports the pump when it is raised or lowered within the pump column. The sealing member comprises: a cover plate (e.g., cover plate 10) having a through hole (e.g., insertion hole 11) extending in the vertical direction and mounted on the open end in a manner that blocks the open end; a lifting shaft (e.g., lifting shaft 20) disposed through the through hole, which moves between a rising position and a falling position when the pump is raised or lowered; and a telescopic mechanism. The member (e.g., telescopic member 30, 30A) extends and retracts along the axial direction of the aforementioned lifting shaft according to the lifting and lowering of the aforementioned lifting shaft. The aforementioned telescopic member includes: a telescopic cylinder (e.g., telescopic cylinder 31) that covers the outer peripheral surface of the protruding portion of the aforementioned lifting shaft that protrudes upward from the aforementioned cover plate; a first mounting member (e.g., first mounting member 32, 34) that is continuously disposed with the upper end (e.g., upper end 31a) of the aforementioned telescopic cylinder and mounted on the upper end surface (e.g., upper end surface 21b) of the aforementioned lifting shaft; and a second mounting member (e.g., second mounting member 33) that is continuously disposed with the lower end (e.g., lower end 31b) of the aforementioned telescopic cylinder and mounted on the upper surface (e.g., upper surface 10a) of the aforementioned cover plate. Based on this configuration, even when the lifting shaft moves up and down, the telescopic cylinder will also extend and retract accordingly, and the gap can be sealed by the telescopic component. As a result, the leakage of residual gas during pump lifting and lowering can be prevented by the telescopic component.

[0109] The second embodiment of the present invention is a sealing member as in the first embodiment, comprising: an upper sealing member (e.g., upper sealing member 40) disposed between the aforementioned first mounting member and the aforementioned upper end face of the aforementioned lifting shaft; and a lower sealing member (e.g., lower sealing member 50) disposed between the aforementioned second mounting member and the aforementioned upper surface of the aforementioned cover plate. Based on this configuration, residual gas leakage during pump lifting and lowering can be prevented by means of telescopic components, upper sealing components, and lower sealing components.

[0110] The third embodiment of the present invention is a sealing member as in the first or second embodiment, having a shaft sealing member (e.g., shaft sealing member 60) disposed between the aforementioned lifting shaft and the aforementioned cover plate. The aforementioned lifting shaft includes: a first shaft portion (e.g., first shaft portion 21); and a second shaft portion (e.g., second shaft portion 22), which has an outer diameter smaller than that of the aforementioned first shaft portion, and is disposed at a position lower than that of the aforementioned first shaft portion, and is inserted into the aforementioned through hole. The aforementioned shaft sealing member is disposed between the lower end face (e.g., lower end face 21c) of the aforementioned first shaft portion and the aforementioned cover plate. Based on this configuration, the sealing performance of the sealing component is improved, and technical issues such as damage to the expansion joint due to discharge pressure will not occur.

[0111] The fourth embodiment of the present invention is a sealing member as in the third embodiment, wherein the aforementioned through hole comprises: a first hole portion (e.g., first hole portion 11a), wherein the lower part of the aforementioned first shaft portion is inserted when the aforementioned lifting shaft is in the aforementioned lowered position; and a second hole portion (e.g., second hole portion 11b), which has an inner diameter smaller than the inner diameter of the aforementioned first hole portion, and is disposed at a position lower than the aforementioned first hole portion, wherein the aforementioned second shaft portion is inserted, and the aforementioned shaft sealing member is disposed between the aforementioned lower end face of the aforementioned first shaft portion and the bottom surface (e.g., bottom surface 11d) of the aforementioned first hole portion. Based on this configuration, the sealing performance of the sealing component is improved, and technical issues such as damage to the expansion joint due to discharge pressure will not occur.

[0112] The fifth embodiment of the present invention is a sealing member as in any of the first to fourth embodiments, which has a shaft fixing member (e.g., shaft fixing member 80) that fixes the aforementioned lifting shaft in the aforementioned lowering position. When the aforementioned lifting shaft is in the aforementioned lowering position, the aforementioned shaft fixing member pushes the aforementioned lifting shaft toward the aforementioned cover plate side via the aforementioned first mounting member. Based on this configuration, the lifting shaft is fixed in the lowering position, and the sealing performance of the shaft sealing component is improved.

[0113] The sixth embodiment of the present invention is a sealing member (e.g., sealing member 3A) as in any of the first to fifth embodiments, wherein the first mounting member (e.g., first mounting member 34) comprises: an annular bottom (e.g., bottom 34a) abutting the upper end of the telescopic cylinder; a wall portion (e.g., peripheral wall portion 34b) extending upward from the outer edge of the bottom portion; and a flange portion (e.g., flange portion 34c) having an outer diameter larger than the outer diameter of the telescopic cylinder, protruding outward from the upper end of the wall portion in the radial direction of the bottom portion. With this configuration, the lifting shaft is fixed in the raised position because a collar is arranged below the flange. As a result, with the lifting shaft fixed in the raised position (the pump is raised), the cover plate can be removed from the upper opening end.

[0114] The seventh embodiment of the present invention is a sealing member as in any of the first to sixth embodiments, which has a movement limiting member (e.g., movement limiting member 90) to limit the aforementioned lifting shaft from moving to a position higher than the aforementioned rising position. Based on this structure, the telescopic cylinder will not stretch excessively, thus avoiding defects such as breakage of the telescopic cylinder or the weld joint.

[0115] The eighth embodiment of the present invention is a submersible pump system comprising: a pump immersed in a treatment liquid; a cylindrical pump column housing the aforementioned pump; and a sealing member as in any of the first to seventh embodiments. Based on this configuration, the leakage of residual gas during pump lifting and lowering can be prevented by using telescopic components.

[0116] 1: Submersible pump system 2: Pump column 2a: Upper open end 2b: Lower open end 3: Sealing components 3A: Sealing components 4: Support cable 5: Pump 6: Bottom valve 7: Collar 7a: Semi-cylindrical component 7A: Collar 7Aa: Semi-cylindrical component 7Ab: Semi-cylindrical component 7b: Semi-cylindrical component 10: Cover plate 10a: Upper surface 10b: Lower surface 11: Through hole (through hole) 11a: First hole 11b: Second hole 11c: Embedded part 11d: Bottom surface 12: Sealing groove 13: Guiding components 20: Lifting Shaft 21: First shaft section 21a: Internal threaded hole 21b: Top surface 21c: Lower end face 22: Second shaft section 22a: First internal thread hole 22b: Second internal thread hole 22c: Lower end face of the second shaft portion 22 23: First structural component 23a: Connecting part 23b: External thread section 24: Second structural component 24a: Connecting part 24b: External thread section 25: Nut component 30: Expansion joint 30A: Expansion Joint 31: Telescopic cylinder 31a: Upper end 31b: Lower end 32: First installation component 32a: Through hole 32b: Sealing groove 32c: Lower surface of the first mounting member 32 32d: Upper surface of the first mounting member 32 33: Second installation component 33a: Through hole 33b: Upper surface of the second mounting member 33 33c: Lower surface of the second mounting member 33 34: First mounting component (shaft fixing component) 34a: Bottom 34b: Peripheral wall (wall part) 34c: Flange portion 34d: Lower surface of bottom 34a 40: Upper sealing component 50: Lower sealing component 60: Shaft seal component 70: Casing 70a: Upper end face of housing 70 71: Cylinder Section 71a: Reception Section 72: First flange portion 73: Second flange portion 74: Cover 80: Shaft fixing component 81: Zhoubi section 82: Flange portion 90: Movement restriction component B1: Plate mounting bolts B2: Expansion joint mounting bolts B3: Housing mounting bolts B4: Cover mounting bolts B5: Press the bolt Lg: Liquefied gas (processing fluid) R1: Liquid delivery path S: Internal space of the telescopic component T: Storage tank T1: Top Plate Vg: vaporized gas

Claims

1. A sealing member that seals the open end of a cylindrical pump column housing a pump immersed in a treatment fluid, and suspends and supports the pump when it is raised and lowered within the pump column, the sealing member comprising: a cover plate having a through hole extending in a vertical direction and mounted on the open end to block the open end; a lifting shaft disposed through the through hole and moving between a raised position and a lower position when the pump is raised and lowered; a telescopic member that extends and retracts axially along the lifting shaft according to the raising and lowering of the lifting shaft; and a shaft sealing member disposed between the lifting shaft and the cover plate; wherein... The aforementioned telescopic member comprises: a telescopic cylinder that covers the outer peripheral surface of the protruding portion of the aforementioned lifting shaft that protrudes upward from the aforementioned cover plate; a first mounting member that is continuously disposed with the upper end of the aforementioned telescopic cylinder and mounted on the upper end surface of the aforementioned lifting shaft; and a second mounting member that is continuously disposed with the lower end of the aforementioned telescopic cylinder and mounted on the upper surface of the aforementioned cover plate; the aforementioned lifting shaft comprises: a first shaft portion; and a second shaft portion having an outer diameter smaller than that of the aforementioned first shaft portion and being disposed at a position lower than that of the aforementioned first shaft portion, and being inserted into the aforementioned through hole; the aforementioned through hole comprises: a first hole portion into which the lower portion of the aforementioned first shaft portion is inserted when the aforementioned lifting shaft is in the aforementioned descending position; The second hole, having a smaller inner diameter than the first hole, is positioned lower than the first hole, and the second shaft is inserted into it. The aforementioned shaft sealing member is disposed between the lower end face of the aforementioned first shaft portion and the bottom face of the aforementioned first hole portion.

2. The sealing member as claimed in claim 1 further comprises: an upper sealing member disposed between the aforementioned first mounting member and the aforementioned upper end face of the aforementioned lifting shaft; and a lower sealing member disposed between the aforementioned second mounting member and the aforementioned upper surface of the aforementioned cover plate.

3. The sealing member as described in claim 1 or 2 further comprises a shaft fixing member for fixing the aforementioned lifting shaft to the aforementioned lowering position, wherein when the aforementioned lifting shaft is in the aforementioned lowering position, the aforementioned shaft fixing member presses the aforementioned lifting shaft to the aforementioned cover plate side via the aforementioned first mounting member.

4. The sealing member as described in claim 1, wherein, The aforementioned first mounting member comprises: an annular plate-shaped bottom that is adjacent to the aforementioned upper end of the aforementioned telescopic cylinder; a wall portion that extends upward from the outer edge of the aforementioned bottom portion; and a flange portion that has an outer diameter larger than the outer diameter of the aforementioned telescopic cylinder and protrudes outward from the upper end of the aforementioned wall portion in the radial direction of the aforementioned bottom portion.

5. The sealing member as described in claim 1 further has a movement limiting member to limit the movement of the aforementioned lifting shaft to a position higher than the aforementioned rising position.

6. A submersible pump system comprising: a pump immersed in a treatment fluid; a cylindrical pump column housing the aforementioned pump; and a sealing member as described in any one of claims 1 to 5.

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