Sealing structure of LNG (Liquefied Natural Gas) high-pressure axial-flow check valve

Abstract

The utility model relates to the technical field of check valves, in particular to a sealing structure of an LNG (Liquefied Natural Gas) high-pressure axial-flow check valve, which comprises a check valve in bolted connection with a connecting pipe; the first flanges are fixed at the two ends of the check valve; the sealing assembly comprises a mounting ring, a sealing ring and a sealing ring, and the mounting ring is fixed to one side of the first flange; the annular groove is formed in one side of the outer surface of the mounting ring; the first springs are fixed in the annular groove, and the six first springs are distributed in the annular groove at equal intervals; the sealing ring is fixed at one end of the first spring; the connecting pipe is fixed at one end of the check valve; the second flange is fixed to one end of the connecting pipe, a mounting groove is formed in one side of the second flange, the mounting groove corresponds to the mounting ring in the forward direction, and the mounting ring is embedded into the mounting groove. The utility model has the advantages that the multi-sealing structure is adopted, the sealing reliability can be effectively improved, the system stability is enhanced, equipment and pipelines are protected, and the safe and efficient operation of the system is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field, especially a kind of sealing structure of LNG high-pressure axial flow check valve. BACKGROUND

[0002] LNG high-pressure axial flow check valve is a kind of ultra-low temperature, high-pressure valve for liquefied natural gas (LNG) storage and transportation system, check valve is the valve that the opening and closing member is circular valve disc and acts to block the backflow of medium by its own weight and medium pressure, belongs to automatic valve, also called non-return valve, one-way valve, backflow valve or isolation valve, the valve disc movement mode is divided into lift type and swing type, lift type check valve is similar in structure to stop valve, only lacks the valve stem driving valve disc, medium flows from the inlet end, and flows from the outlet end, when the inlet pressure is greater than the sum of the weight of valve disc and its flow resistance, the valve is opened, otherwise, the valve is closed when medium backflows, swing type check valve has a valve disc that is inclined and can rotate around the shaft, and the working principle is similar to that of lift type check valve, check valve is often used as the bottom valve of water pumping device to prevent water backflow, and check valve and stop valve are used in combination to play a safety isolation role.

[0003] In the prior art, check valve and connecting pipe are usually connected by flange and bolt, and there are many bolt holes on the flange, which are locked by bolts;

[0004] However, when check valve is connected with pipeline, only flange sealing is adopted, and if the connection is not completely sealed, fluid leakage and pressure loss will occur, the operating efficiency of the entire pipeline system will be reduced, fluid delivery amount will be reduced, production efficiency will be affected, and in the pipeline system involving flammable, explosive or toxic medium, only flange sealing will cause serious safety accidents, and leaked medium can cause fire, explosion or poisoning, etc. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of sealing structure of LNG high-pressure axial flow check valve, to solve the problem that check valve is connected with pipeline in the above background art, if connection is not completely sealed, fluid leakage and pressure loss will occur, the operating efficiency of the entire pipeline system will be reduced, fluid delivery amount will be reduced, production efficiency will be affected, and in the pipeline system involving flammable, explosive or toxic medium, only flange sealing will cause serious safety accidents, and leaked medium can cause fire, explosion or poisoning, etc.

[0006] To solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] The utility model is a kind of sealing structure of LNG high-pressure axial flow check valve, comprising:

[0008] The check valve is connected with the connecting pipe;

[0009] The first flange is fixed at two ends of the check valve;

[0010] The sealing assembly comprises a mounting ring fixed on one side of the first flange;

[0011] The annular groove is arranged on one side of the outer surface of the mounting ring;

[0012] The first spring is fixed inside the annular groove, and there are six first springs which are equidistantly distributed inside the annular groove;

[0013] The sealing ring is fixed at one end of the first spring;

[0014] The connecting pipe is fixed at one end of the check valve;

[0015] The second flange is fixed at one end of the connecting pipe.

[0016] Optionally, the upper surface of the check valve is fixed with a controller, and the first flange is connected with the second flange, and the outer surfaces of the first flange and the second flange are penetrated by bolts.

[0017] Optionally, the second flange is provided with a mounting groove on one side, and the mounting groove is directly corresponding to the mounting ring, and the mounting ring is immersed in the mounting groove.

[0018] Optionally, the connecting pipe is fixed with a tapered pipe on one side, and the diameter of one end of the tapered pipe is large, and the diameter of the other end is small.

[0019] Optionally, the connecting pipe is fixed with a fixed frame inside, and the electric push rod is fixed on one side of the fixed frame.

[0020] Optionally, the output end of the electric push rod is provided with a sealing block, and the sealing block is immersed in the tip of the tapered pipe.

[0021] Optionally, the dismounting assembly further comprises:

[0022] The mounting hole is arranged on both sides of the output end of the electric push rod;

[0023] The second spring is fixed inside the mounting hole;

[0024] The clamping column is fixed at one end of the second spring.

[0025] Optionally, the sealing block is provided with a clamping groove on one side, and the clamping groove is directly corresponding to the mounting hole, and the tail end of the clamping column extends into the clamping groove.

[0026] Compared with the prior art, the utility model has the advantages of:

[0027] The utility model discloses, through setting up the check valve, controller, first flange and sealing assembly, when connecting pipe is connected on check valve, the second flange is contacted with the first flane, makes the installation ring to be clamped into the inside of installation groove, under the elastic force of first spring, makes sealing ring seal up in the installation groove, then bolt is fixed on the outer surface of first flange and second flange, again through external controller, starts electric push rod, and electric push rod drives sealing block to move, and sealing block blocks up inside conical pipe, and check valve and connecting pipe are sealed up, and multiple sealing structure can effectively improve the sealing reliability, and enhance system stability, and protect equipment and pipeline, and ensure that system is safe and efficient operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduce, obviously, the following description in the drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0029] Figure 1 It is the first view schematic diagram of the utility model;

[0030] Figure 2 It is the sealing assembly structure exploded view of the utility model;

[0031] Figure 3 It is the structure exploded view of the local sealing assembly of the utility model;

[0032] Figure 4 It is the structure diagram of the dismounting assembly of the utility model;

[0033] Figure 5 It is the structure enlarged view of A in the utility model Figure 4 .

[0034] Reference signs:

[0035] 11, check valve;12, controller;13, first flange;

[0036] 2, sealing assembly;21, installation ring;22, annular groove;23, first spring;24, sealing ring;25, connecting pipe;251, second flange;252, installation groove;26, conical pipe;27, fixed frame;28, electric push rod;29, sealing block;

[0037] 3, dismounting assembly;31, mounting hole;32, second spring;33, clamping column;34, clamping groove. DETAILED DESCRIPTION

[0038] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is placed, or the orientation or positional relationship commonly understood by those skilled in the art, which is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a specific orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model.

[0039] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0040] In view of the prior art, if the connection is not completely sealed when the check valve is connected with the pipeline, fluid leakage and pressure loss will occur, the operating efficiency of the entire pipeline system will be reduced, the fluid delivery amount will be reduced, and the production efficiency will be affected, and for pipeline systems involving flammable, explosive or toxic media, only flange sealing can cause serious safety accidents, and the leaked medium can cause fire, explosion or poisoning.

[0041] Please refer to Figures 1 to 5 The embodiment is a sealing structure of an LNG high-pressure axial flow check valve, which comprises:

[0042] The check valve 11 is bolted to the connecting pipe 25.

[0043] The first flange 13 is fixed at both ends of the check valve 11.

[0044] The sealing assembly 2 comprises:

[0045] The mounting ring 21 is fixed to one side of the first flange 13.

[0046] The annular groove 22 is formed on one side of the outer surface of the mounting ring 21.

[0047] The first spring 23 is fixed inside the annular groove 22, and there are six first springs 23, which are equally distributed inside the annular groove 22.

[0048] Sealing ring 24, fixed in one end of the first spring 23;

[0049] Connecting pipe 25, fixed in one end of the check valve 11;

[0050] Second flange 251, fixed in one end of the connecting pipe 25;

[0051] The check valve 11 allows fluid to flow in one direction, that is, from the inlet to the outlet in the fluid system, and closes when the fluid pressure on the outlet side is lower than that on the inlet side, preventing the reverse flow of fluid. The mounting ring 21 mainly provides a basic structure for mounting the sealing ring 24, and the annular groove 22 is used to place the first spring 23, which provides a stable containing space for the first spring 23 and limits the movement range of the first spring 23. The sealing ring 24 tightly fits the surface of the connecting pipe 25 under the elastic force of the first spring 23, preventing fluid leakage along the gap between the connecting pipe 25 and the check valve 11, and ensuring the sealing of the system.

[0052] The upper surface of the check valve 11 is fixed with the controller 12, and the first flange 13 is connected with the second flange 251, and the outer surface of the first flange 13 and the second flange 251 is penetrated by the bolt;

[0053] One side of the second flange 251 is provided with a mounting groove 252, and the mounting groove 252 is in positive correspondence with the mounting ring 21, and the mounting ring 21 is immersed in the mounting groove 252, and one side of the connecting pipe 25 is fixed with the tapered pipe 26, one end of which is large in diameter and the other end is small in diameter;

[0054] The inside of the connecting pipe 25 is fixed with the fixing frame 27, one side of which is fixed with the electric push rod 28, and the output end of the electric push rod 28 is installed with the sealing block 29, and the sealing block 29 is immersed in the tip of the tapered pipe 26;

[0055] The tapered pipe 26 is large in diameter at one end and small in diameter at the other end, which provides guidance for the movement of the sealing block 29. The fixing frame 27 provides stable support and fixed position for the electric push rod 28 and other components, ensuring that the electric push rod 28 will not be displaced or shaken due to external force during operation, and ensuring that the output end of the electric push rod 28 can accurately push the sealing block 29 to perform sealing operation.

[0056] Working principle:

[0057] When the check valve 11 is connected to the connecting pipe 25, the second flange 251 is in contact with the first flange 13, the mounting ring 21 is clamped into the mounting groove 252, the sealing ring 24 seals the mounting groove 252 under the elastic force of the first spring 23, then the bolts are fixed to the outer surfaces of the first flange 13 and the second flange 251, the external controller 12 is started to drive the electric push rod 28, the electric push rod 28 drives the sealing block 29 to move, the sealing block 29 blocks the inside of the tapered pipe 26, and the check valve 11 is sealed with the connecting pipe 25.

[0058] The multiple sealing structure can effectively improve the sealing reliability, enhance the system stability, protect the equipment and the pipeline, and ensure the safe and efficient operation of the system.

[0059] Please refer to Figures 1 to 5 The embodiment is based on the above-mentioned embodiment and further includes:

[0060] The disassembly and assembly assembly 3 includes:

[0061] The mounting hole 31 is arranged on both sides of the output end of the electric push rod 28;

[0062] The second spring 32 is fixed in the mounting hole 31;

[0063] The clamping column 33 is fixed to one end of the second spring 32;

[0064] The clamping groove 34 is arranged on one side of the sealing block 29 and corresponds to the mounting hole 31, and the end of the clamping column 33 extends into the clamping groove 34;

[0065] The mounting hole 31 provides accurate positioning and stable support position for the clamping column 33 and the second spring 32, the second spring 32 is fixed in the mounting hole 31 and connected to the clamping column 33 at one end, and the core function is to provide elastic recovery force for the clamping column 33, to form firm connection through close cooperation with the clamping groove 34, prevent the sealing block 29 from loosening or moving during use, and ensure the sealing effect between the check valve 11 and the connecting pipe 25.

[0066] Working principle:

[0067] After the sealing block 29 is used for a long time, the staff can press the clamping column 33 inward, so that the second spring 32 is compressed in the mounting hole 31, and the clamping column 33 is out of the clamping groove 34, at this time, the sealing block 29 can be removed, and a new sealing block 29 can be installed into the output end of the electric push rod 28, when the clamping column 33 corresponds to the clamping groove 34, the second spring 32 will quickly recover the deformation under the elastic force of the second spring 32, and the clamping column 33 is clamped into the clamping groove 34, which can continuously maintain the sealing effect of the check valve 11;

[0068] The step realizes efficient replacement of the sealing block 29 and continuous guarantee of the sealing effect of the check valve 11 through the precise cooperation of the clamping column 33, the second spring 32 and the clamping groove 34, and improves the convenience of equipment maintenance.

[0069] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application have been described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A seal structure of an LNG high-pressure axial flow check valve, characterized by, The utility model relates to a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

2. The seal structure of a high-pressure LNG axial check valve according to claim 1, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

3. The seal structure of a high-pressure LNG axial check valve according to claim 1, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

4. The seal structure of a high-pressure LNG axial check valve according to claim 1, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

5. The seal structure of a high-pressure LNG axial check valve according to claim 4, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

6. The seal structure of a high-pressure LNG axial check valve according to claim 5, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

7. The seal structure of a high-pressure LNG axial check valve according to claim 6, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly.

8. The seal structure of a high-pressure LNG axial check valve according to claim 7, wherein The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dismounting assembly. The utility model discloses a valve, and particularly relates to a valve with a sealing assembly and a dis

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