Compact bottom valve structure for movable low-temperature immersed pump matched with LNG (Liquefied Natural Gas) ship and floating device

Abstract

The invention discloses a compact bottom valve structure for a movable low-temperature immersed pump matched with an LNG (Liquefied Natural Gas) ship and a floating device, and relates to the technical field of immersed pumps, in particular to the compact bottom valve structure for the movable low-temperature immersed pump matched with the LNG ship and the floating device. An upper valve body is connected with a pump well flange through a stud and a nut; the positioning structures are respectively arranged on the upper valve body and the suction section of the pump head to limit the pump head to rotate within an allowable range; the gland is assembled at the top end of the valve plate through a bolt b; a runner is arranged in the valve plate, so that the flowing requirement of a medium at a suction end can be met; the eight compression reset structures are uniformly distributed and fixedly mounted at the bottom of the inner side of the upper valve body; the gland is arranged on the compression reset structure, and the opening and the closing of the flow channel on the valve plate are realized through the compression and the reset of the compression reset structure. According to the technical scheme, the problems that in the prior art, a bottom valve spring of an LNG pump used on land is arranged on the outer side of a valve body, the overall appearance is large, and the LNG pump is not suitable for being installed in a compact space on a ship are solved.

Description

Technical Field

[0001] The present invention discloses a compact bottom valve structure for a movable low-temperature submersible pump for an LNG ship or a floating device, relates to the technical field of submersible pumps, and in particular to a compact bottom valve structure for a movable low-temperature submersible pump for an LNG ship or a floating device. Background Art

[0002] At present, there is a blank in China for movable cryogenic submersible pumps for LNG ships and floating devices. In the prior art, the bottom valve spring of the LNG pump is installed on the outside of the valve body, and spring and guide rod mounting holes are added on the outside of the upper valve body and valve plate, which increases its external dimensions.

[0003] In the prior art, the upper valve body of the LNG pump bottom valve is externally connected to the pump well using studs and nuts. To avoid interference between the guide rod and the studs and nuts, the upper valve body is raised to leave enough space for installing the guide rod.

[0004] The space inside the ship is limited. In order to leave more space for other equipment, the equipment needs to be miniaturized and integrated, and the space occupied can be minimized without affecting the function. Therefore, in the prior art, the bottom valve spring of the LNG pump is arranged on the outside of the valve body, which increases the overall shape and height, and is not suitable for installation in the compact space on the ship.

[0005] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of compact bottom valve structure for a movable cryogenic submersible pump supporting LNG ships and floating devices, so as to overcome the problems existing in the prior art. Summary of the invention

[0006] According to the technical problem that the bottom valve spring of the LNG pump for land use proposed in the above-mentioned prior art is arranged on the outside of the valve body, the overall shape is large, and it is not suitable for installation in the compact space on board, a compact bottom valve structure for a movable cryogenic submersible pump for LNG ships and floating devices is provided. The present invention mainly connects the upper valve body with the pump well flange through fasteners. When the pump is running, the movable cryogenic submersible pump can be installed on the bottom valve, and a flow channel is arranged in the valve plate to meet the flow requirements of the medium at the suction end.

[0007] The technical means adopted by the present invention are as follows:

[0008] A compact bottom valve structure for a movable cryogenic submersible pump for LNG ships and floating devices includes: an upper valve body, a valve plate, a gland positioning structure, and a compression reset structure;

[0009] Further, the upper valve body is connected to the pump well flange via studs and nuts;

[0010] Furthermore, the positioning structures are respectively installed on the upper valve body and the suction section of the pump head to limit the rotation of the pump head within the allowable range;

[0011] Further, the gland is assembled on the top of the valve plate by bolts b;

[0012] Furthermore, a flow channel is provided in the valve plate, which can meet the flow requirements of the medium at the suction end;

[0013] Furthermore, the compression-reset structure is composed of eight sets, which are evenly distributed and fixedly installed on the inner bottom of the upper valve body;

[0014] Furthermore, the gland is mounted on the compression-reset structure, and the flow channel on the valve plate is opened and closed by compression and reset of the compression-reset structure.

[0015] Furthermore, the inner hole of the upper valve body is a conical surface, and the pump head of the movable cryogenic submersible pump can be installed on the conical surface when the movable cryogenic submersible pump is in use, and the upper valve body has the function of supporting the movable cryogenic submersible pump.

[0016] A spiral wound gasket is installed between the upper valve body and the pump well flange for sealing.

[0017] Further, the positioning structure includes: an anti-rotation stud a and an anti-rotation stud b;

[0018] Further, the anti-rotation stud a is horizontally arranged on the inner side of the upper valve body;

[0019] Furthermore, there are six anti-rotation studs a, which are evenly distributed and symmetrically arranged in threes;

[0020] Furthermore, there are two anti-rotation studs b, which are symmetrically and vertically installed at the lower part of the suction section of the pump head;

[0021] Furthermore, the anti-rotation stud a and the anti-rotation stud b cooperate to limit the pump head from rotating within an allowable range.

[0022] Further, the compression reset structure includes: a valve stem, a positioning sleeve and a spring;

[0023] Furthermore, the valve stem is vertically assembled on the upper end surface of the bottom inner side of the upper valve body;

[0024] Further, the spring is a compression spring, which is sleeved on the valve stem;

[0025] Furthermore, the positioning sleeve is fixedly installed in the through hole on the gland and sleeved on the valve stem to encapsulate the spring on the valve stem.

[0026] Furthermore, a flooded ring is mounted at the bottom of the upper valve body.

[0027] When the pump is installed on the bottom valve, the suction section contacts the valve plate. Under the gravity of the pump head, the valve plate drops, and the valve plate squeezes the spring through the gland to compress the spring, and the flow channel on the valve plate opens. At this time, the bottom valve is in an open state; after the bottom valve is opened, the medium can enter the interior of the pump through the flow channel in the valve plate.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The present invention provides a compact bottom valve structure for a movable cryogenic submersible pump for LNG ships and floating devices. The bottom valve spring is arranged inside the valve body, which can shorten the axial and radial dimensions of the bottom valve and is suitable for the requirements for equipment structure in ships and floating devices.

[0030] In summary, the technical solution of the present invention solves the problem that the bottom valve spring of the onshore LNG pump in the prior art is arranged on the outside of the valve body, the overall shape is large, and it is not suitable for installation in the compact space on board. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 For the present invention Figure 1 Top view;

[0034] Figure 3 For the present invention Figure 1 Part I: Enlarged view;

[0035] Figure 4 For the present invention Figure 1 Part II: Enlarged view;

[0036] Figure 5 It is a comparison diagram of the working status of the present invention.

[0037] In the figure: 1. upper valve body; 2. anti-rotation stud a; 3. valve plate; 4. stud, nut; 5. spiral wound gasket; 6. bolt b; 7. universal plug ring; 8. valve stem; 9. gland; 10. positioning sleeve; 11. spring; 12. anti-rotation stud b. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] As shown in the figure, the present invention provides a compact bottom valve structure for a movable low-temperature submersible pump for LNG ships and floating devices, including: an upper valve body 1, a valve plate 3, a gland 9 positioning structure, and a compression reset structure; the upper valve body 1 is connected to the pump well flange through a stud and a nut 4; the positioning structure is respectively installed on the upper valve body 1 and the pump head suction section to limit the pump head from rotating within an allowable range; the gland 9 is assembled on the top of the valve plate 3 through a bolt b6; a flow channel is provided in the valve plate 3 to meet the flow requirements of the medium at the suction end; the compression reset structure is eight sets, which are evenly distributed and fixedly installed on the inner bottom of the upper valve body 1; the gland 9 is installed on the compression reset structure, and the opening and closing of the flow channel on the valve plate 3 are realized by compression and reset of the compression reset structure.

[0046] The inner hole of the upper valve body 1 is a conical surface. When the movable cryogenic submersible pump is in use, the pump head can be installed on the conical surface. The upper valve body 1 has the function of supporting the movable cryogenic submersible pump.

[0047] A spiral wound gasket 5 is installed between the upper valve body 1 and the pump well flange for sealing.

[0048] The positioning structure includes: an anti-rotation stud a2 and an anti-rotation stud b12; the anti-rotation stud a2 is horizontally arranged on the inner side of the upper valve body 1; there are six anti-rotation studs a2, which are evenly distributed and symmetrically arranged in threes; there are two anti-rotation studs b12, which are symmetrically installed vertically at the lower part of the suction section of the pump head; the anti-rotation studs a2 and the anti-rotation studs b12 cooperate to limit the rotation of the pump head within an allowable range.

[0049] The compression reset structure includes: a valve stem 8, a positioning sleeve 10 and a spring 11; the valve stem 8 is vertically assembled on the upper end surface of the inner bottom of the upper valve body 1; the spring 11 is a compression spring, which is sleeved on the valve stem 8; the positioning sleeve 10 is fixedly installed in the through hole on the pressure cover 9, and is sleeved on the valve stem 8, so that the spring 11 is encapsulated on the valve stem 8.

[0050] A flooded ring 7 is mounted at the bottom of the upper valve body 1 .

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compact bottom valve structure for a movable cryogenic submersible pump for LNG ships and floating devices, characterized in that: The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship or a floating device comprises: an upper valve body (1), a valve plate (3), a gland (9) positioning structure, and a compression reset structure; The upper valve body (1) is connected to the pump well flange via studs and nuts (4); The positioning structure is respectively installed on the upper valve body (1) and the suction section of the pump head to limit the rotation of the pump head within the allowable range; The gland (9) is assembled on the top of the valve plate (3) by means of bolts b (6); The valve plate (3) is provided with a flow channel, which can meet the flow requirements of the medium at the suction end; The compression reset structure comprises eight sets, which are evenly distributed and fixedly installed on the inner bottom of the upper valve body (1); The pressure cover (9) is mounted on the compression-reset structure, and the opening and closing of the flow channel on the valve plate (3) are achieved through compression and reset of the compression-reset structure.

2. The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship and a floating device according to claim 1 is characterized in that: The inner hole of the upper valve body (1) is a conical surface. When the movable low-temperature submersible pump is in use, the pump head can be installed on the conical surface. The upper valve body (1) has the function of supporting the movable low-temperature submersible pump.

3. The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship and a floating device according to claim 1 is characterized in that: A wound gasket (5) is installed between the upper valve body (1) and the pump well flange for sealing.

4. The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship and a floating device according to claim 1 is characterized in that: The positioning structure comprises: an anti-rotation stud a (2) and an anti-rotation stud b (12); The anti-rotation stud a (2) is horizontally arranged on the inner side of the upper valve body (1); The number of the anti-rotation studs a (2) is six, which are evenly distributed and symmetrically arranged in threes; The anti-rotation studs b (12) are two in number and are symmetrically and vertically installed at the lower part of the suction section of the pump head; The anti-rotation stud a (2) and the anti-rotation stud b (12) cooperate to limit the pump head from rotating within an allowable range.

5. The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship and a floating device according to claim 1 is characterized in that: The compression reset structure comprises: a valve stem (8), a positioning sleeve (10) and a spring (11); The valve stem (8) is vertically assembled on the upper end surface of the inner bottom of the upper valve body (1); The spring (11) is a compression spring, which is sleeved on the valve stem (8); The positioning sleeve (10) is fixedly mounted in the through hole on the gland (9) and is sleeved on the valve stem (8) to encapsulate the spring (11) on the valve stem (8).

6. The compact bottom valve structure for a movable cryogenic submersible pump for an LNG ship and a floating device according to claim 1 is characterized in that: The bottom of the upper valve body (1) is equipped with a flooded ring (7).

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