Bolt for liquid cargo system

Abstract

The utility model relates to a bolt used for a liquid cargo system, which comprises a supporting mechanism, the supporting mechanism comprises a middle nut, the two ends of the middle nut are respectively provided with a first thread groove and a second thread groove, the middle nut is arranged between two corresponding flanges to be installed, and the first thread groove is communicated with the second thread groove. The length of the middle nut is matched with the distance between two flanges to be installed. The locking mechanism comprises a first bolt and a second bolt, and the first bolt and the second bolt penetrate through one side of the flange to be installed to the other side of the flange to be installed and extend to the first threaded groove and the second threaded groove. By means of the arrangement, when one bolt is replaced, the middle nut does not need to be dismantled, the middle nut can still be tightly connected with the second bolt or the first bolt, and occupied installation space is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bolts, especially a bolt for a liquid cargo system. BACKGROUND

[0002] In the field of liquid cargo transportation and processing, liquid cargo systems are widely used in LPG, LEG, LNG and dual-fuel ships, and their reliability and stability are crucial to the smoothness of protection and the safety of personnel and the environment. A liquid cargo system is usually composed of liquid cargo pipelines, liquid cargo equipment, and valves for controlling flow, and the connection between these components directly affects the performance of the entire system. With the gradual development of intelligent ships, the increase in systems and functions, the types of ship pipeline bolts and valves have further increased, among which the butt-type butterfly valve with double-end screw connection has been widely used.

[0003] The length of the double-end screw used in the traditional installation of the clamping-type butterfly valve is too long, especially in the application scenario of the clamping-type butterfly valve, making it difficult to install in a small space. The traditional installation method of the liquid cargo system for the clamping-type butterfly valve is to insert the double-end screw into the flange bolt hole from either end, and the two nuts are pre-tightened. This type of installation often results in insufficient installation space. SUMMARY

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem of insufficient installation space for the clamping-type butterfly valve and double-end screw in a small space in the prior art, thereby providing a bolt for a liquid cargo system.

[0005] To solve the above technical problems, the utility model provides a bolt for a liquid cargo system, comprising:

[0006] A support mechanism comprising a middle nut, the middle nut having a first threaded groove and a second threaded groove at both ends respectively, the middle nut being arranged between two corresponding flanges to be installed, the length of the middle nut being adapted to the distance between the two flanges to be installed;

[0007] A locking mechanism comprising a first bolt and a second bolt, the first bolt and the second bolt respectively passing from one side of the flange to be installed to the other side and extending to the first threaded groove and the second threaded groove.

[0008] In one embodiment of the utility model, the first bolt and the second bolt each comprise a screw head, a clamping portion and a screw rod connected in sequence, the size of the clamping portion being adapted to the hole size of the flange to be installed, and the axial length of the clamping portion being adapted to the thickness of the flange to be installed.

[0009] In one embodiment of the utility model, the both ends of intermediate nut are respectively provided with protruding parts, the radial length of protruding part and screw head is all greater than the radial dimension of clamping part.

[0010] In one embodiment of the utility model, the first bolt and the second bolt are all external hexagonal bolts, and the head end surfaces of the first bolt and the second bolt are respectively provided with internal hexagonal grooves.

[0011] In one embodiment of the utility model, the protruding parts are annularly arranged on the circumferential sides of the both ends of the intermediate nut, and the side close to the screw head of the protruding part is a plane structure.

[0012] In one embodiment of the utility model, the end parts of the first thread groove and the second thread groove are respectively provided with first guide inclined surfaces, and the clamping parts of the first bolt and the second bolt are respectively provided with second guide inclined surfaces matched with the first guide inclined surfaces.

[0013] In one embodiment of the utility model, the spaces in the first thread groove and the second thread groove are not communicated, and a partition part is arranged between the first thread groove and the second thread groove.

[0014] In one embodiment of the utility model, the thread directions of the first bolt, the second bolt, the first thread groove and the second thread groove are all same.

[0015] In one embodiment of the utility model, the supporting mechanisms and the locking mechanisms are multiple groups, and the multiple groups of supporting mechanisms and locking mechanisms are annularly arranged on the circumferential sides of the to-be-installed double-jacketed butterfly valve.

[0016] The utility model discloses a kind of liquid cargo systems, including above-mentioned a kind of bolt for liquid cargo system.

[0017] In one embodiment of the utility model, the liquid cargo system further includes: a liquid cargo pipeline, a liquid cargo equipment and a double-jacketed butterfly valve, the liquid cargo pipeline and the liquid cargo equipment are respectively sealed and communicated at the two ends of the double-jacketed butterfly valve, and the side close to the liquid cargo pipeline and the liquid cargo equipment is respectively provided with corresponding flanges and connected by connecting bolts.

[0018] The above technical scheme of the utility model has the following advantages compared with prior art:

[0019] The bolt for liquid cargo system has the advantages that it is simple to install and easy to disassemble, when the liquid cargo pipeline or equipment is maintained, the first bolt or the second bolt can be individually removed according to requirements, and the bolt or the nut can be replaced according to different sizes of flanges or butterfly valves, when one of the bolts is replaced, the intermediate nut does not need to be removed, and it can still be tightly connected with the second bolt or the first bolt, and the installation space is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the content of the utility model more easily be clearly understood, below according to the specific embodiment of the utility model and combining with the drawings, the utility model is further explained in detail, wherein

[0021] Figure 1 It is the structural schematic diagram of the liquid cargo system of the utility model;

[0022] Figure 2 It is the structural schematic diagram of the connecting bolt of the utility model;

[0023] Figure 3 It is the structural schematic diagram of the first bolt of the utility model.

[0024] The description of the drawing of the specification is as follows: 1, liquid cargo pipeline;2, flange;3, liquid cargo equipment;4, protruding portion;5, first bolt;6, intermediate nut;7, second bolt;8, clamping type butterfly valve;9, screw head;10, clamping portion;11, first guide inclined surface;12, second guide inclined surface;13, first thread groove;14, second thread groove;15, separation portion;16, screw rod;17, outer hexagon;18, inner hexagon. DETAILED DESCRIPTION

[0025] The utility model is further explained below in combination with the drawings and specific embodiments, so that the person skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model.

[0026] Embodiment 1

[0027] Referring to Figures 1-3 The utility model discloses a bolt for liquid cargo system, including:

[0028] Supporting mechanism, it includes intermediate nut 6, the first thread groove 13 and the second thread groove 14 are set up respectively in the both ends of intermediate nut 6, the intermediate nut 6 is arranged between two corresponding flanges 2 to be installed, and the length of intermediate nut 6 is adapted to the interval of two flanges 2 to be installed.

[0029] Locking mechanism, it includes first bolt 5 and second bolt 7, and first bolt 5 and second bolt 7 respectively from the side of flange 2 to be installed pass to the other side and extend to first thread groove 13 and second thread groove 14.

[0030] The utility model relates to a bolt for liquid cargo system, and the middle nut 6 is supported between two flanges 2 to be installed, and the first bolt 5 and the second bolt 7 play the locking effect. The first bolt 5 and the second bolt 7 are respectively screwed with the first thread groove 13 and the second thread groove 14 on the middle nut 6, the two flanges 2 to be installed are pulled tightly and abut on both ends of the middle nut 6, the flanges 2 to be installed and the clamp type butterfly valve 8 to be installed can be pressed and closely combined, and the first bolt 5 and the second bolt 7 are respectively connected with the two flanges 2 independently at both ends of the middle nut 6, which realizes simple installation and convenient disassembly, when the liquid cargo pipeline 1 or equipment is maintained, the first bolt 5 or the second bolt 7 can be removed individually according to the requirement, the middle nut 6 does not need to be removed, and the second bolt 7 or the first bolt 5 can still be kept in close connection, and the occupation of installation space is reduced.

[0031] Referring to Figure 2 As shown in the figure, the first bolt 5 and the second bolt 7 all include: the screw head 9, the clamping part 10 and the screw rod 16 connected in sequence, the size of the clamping part 10 is matched with the hole size of the flange 2 to be installed, the axial length of the clamping part 10 is matched with the thickness of the flange 2 to be installed, and the first bolt 5 and the second bolt 7 are respectively aligned with the corresponding holes on the flange 2 to be installed. Since the size of the clamping part 10 is accurately matched with the hole size of the flange 2 to be installed, the bolt can be smoothly inserted into the hole of the flange 2, and in the insertion process, the slight interference fit between the clamping part 10 and the hole of the flange 2, the interference amount is usually controlled between 0.01 mm-0.03mm, a certain friction force will be generated, so that the bolt can be preliminarily fixed in the hole of the flange 2 after insertion, preventing it from easily shaking. Continue to tighten the bolt, and the clamping part 10 is completely immersed in the flange 2. Since the axial length of the clamping part 10 is matched with the thickness of the flange 2 to be installed, and is not greater than the thickness of the flange 2 to be installed, when the clamping part 10 is completely immersed in the flange 2, the two ends thereof are flush with or slightly recessed from the two side surfaces of the flange 2, at this time, the clamping part 10 can be stably clamped in the flange 2, providing stable support for the connection of the screw rod 16 and the thread groove of the middle nut 6.

[0032] Referring to Figure 2As shown, the two ends of the intermediate nut 6 are respectively provided with protrusions 4, the radial lengths of the protrusions 4 and the screw heads 9 are greater than the radial dimension of the clamping portions 10, the clamping portions 10 are completely immersed in the flanges 2, and do not affect the abutment of the screw heads 9 or the protrusions 4 with the flanges 2. The protrusions 4 are located at the two ends of the intermediate nut 6, specifically, at the two ends of the intermediate nut 6 opposite to the flanges 2 to be installed. The protrusions 4 can be integrally formed with the intermediate nut 6 to ensure the connection strength between the protrusions 4 and the intermediate nut 6 body, and avoid weak connection points. The shape of the protrusions 4 is generally annular, surrounding the outer periphery of the end of the intermediate nut 6. When the first bolt 5 and the second bolt 7 are respectively inserted into the flange 2 holes from one side of the two flanges 2 to be installed, since the radial lengths of the protrusions 4 and the screw heads 9 are greater than the radial dimension of the clamping portions 10, when the clamping portions 10 are in the flange 2 holes, the end faces of the screw heads 9 and the protrusions 4 can abut and lock from the two ends of the flange 2, respectively.

[0033] Referring to Figure 3 As shown, the first bolt 5 and the second bolt 7 are both hex bolts 17, and the end faces of the screw heads 9 of the first bolt 5 and the second bolt 7 are respectively provided with internal hex 18 grooves. During installation, the operator can select a hex 17 or internal hex 18 wrench according to the working space and tooling conditions, thereby improving the operability in different installation environments and providing convenience for equipment maintenance and replacement.

[0034] Referring to Figure 2 As shown, the protrusions 4 are annularly arranged on the circumferential sides of the two ends of the intermediate nut 6, and the side close to the screw head 9 of the protrusion 4 is a planar structure. The planar structure has a large contact area due to the flatness, thereby avoiding the case of excessive local stress.

[0035] Referring to Figure 2 As shown, the ends of the first threaded groove 13 and the second threaded groove 14 are respectively provided with first guide bevels 11, and the clamping portions 10 of the first bolt 5 and the second bolt 7 are respectively provided with second guide bevels 12 adapted to the first guide bevels 11. When the clamping portions 10 of the bolts approach the first threaded groove 13 and the second threaded groove 14 of the intermediate nut 6, the second guide bevels 12 on the clamping portions 10 are in contact with the first guide bevels 11 at the ends of the threaded grooves. Due to the precise adaptation of the two guide bevels, the second guide bevel 12 slides along the inclined direction of the first guide bevel 11 under the action of the insertion force. The guiding effect of the first guide bevel 11 enables the bolt to automatically align with the central axis of the threaded groove, reduces the operation of manually adjusting the angle of the bolt, avoids the problems of installation difficulty or thread damage caused by the angle deviation between the bolt and the threaded groove, and improves the efficiency and quality of installation.

[0036] Referring to Figure 2As shown, the spaces in the first thread groove 13 and the second thread groove 14 are not communicated, a partition 15 is arranged between the first thread groove 13 and the second thread groove 14, the first bolt 5 is screwed into the first thread groove 13, the second bolt 7 is screwed into the second thread groove 14, the tightening and stress of the two bolts are independent of each other, and one thread groove cannot affect the other one due to changes in the thread groove.

[0037] The thread directions of the first bolt 5, the second bolt 7, the first thread groove 13 and the second thread groove 14 are the same, the first bolt 5 and the second bolt 7 are connected to the flange 2 from the upper and lower sides of the mirror image respectively, when the thread directions are the same, the first bolt 5 and the second bolt 7 are tightened clockwise and counterclockwise respectively, thus according to the installation sequence, the tightening of the latter bolt cannot cause the loosening of the former bolt, but can make the connection more tight.

[0038] The supporting mechanism and the locking mechanism are multiple groups, the multiple groups of supporting mechanisms and locking mechanisms are arranged around the side of the to-be-installed clamped butterfly valve, and the connection strength of the clamped butterfly valve after installation is improved.

[0039] Embodiment 2

[0040] The embodiment discloses a liquid cargo system, which comprises a bolt for a liquid cargo system.

[0041] Reference Figure 1 As shown, the liquid cargo system comprises a liquid cargo pipeline 1, a liquid cargo equipment 3 and a clamped butterfly valve 8, the liquid cargo pipeline 1 and the liquid cargo equipment 3 are respectively sealed and communicated to the two ends of the clamped butterfly valve 8, and the sides close to the liquid cargo pipeline 1 and the liquid cargo equipment 3 are respectively provided with corresponding flanges 2 and are connected through connecting bolts. When the components of the liquid cargo system are positioned and initially placed, the clamped butterfly valve 8 is placed in the middle, the two ends of the clamped butterfly valve 8 can be conveniently connected to the pipeline flanges 2 of the liquid cargo pipeline 1 and the liquid cargo equipment 3, the flanges 2 on the side close to the clamped butterfly valve 8 are aligned with each other, the middle nut 6 is placed between the flanges 2 of the liquid cargo pipeline 1 and the liquid cargo equipment 3, and the position of the middle nut 6 is ensured to be accurate. The first bolt 5 and the second bolt 7 are respectively inserted from the sides of the flanges 2 of the liquid cargo pipeline 1 and the liquid cargo equipment 3 and are screwed into the first thread groove 13 and the second thread groove 14 at the two ends of the middle nut 6.

[0042] Obviously, the above embodiment is only an example for clearly illustrating the present application, and is not a limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A bolt for a liquid cargo system, characterized in that The utility model relates to a flange mounting structure of a butterfly valve, which comprises a supporting mechanism and a locking mechanism. The supporting mechanism comprises a middle nut, and first and second threaded grooves are formed at both ends of the middle nut respectively. The locking mechanism comprises first and second bolts.

2. A stud for use in a liquid cargo system according to claim 1, characterized in that: Both the first and second bolts comprise a screw head, a clamping part and a screw rod connected in sequence.

3. A bolt for use in a liquid cargo system according to claim 2, characterised in that: The size of the clamping part is adapted to the size of the hole of the flange, and the axial length of the clamping part is adapted to the thickness of the flange.

4. A bolt for use in a liquid cargo system according to claim 2, wherein: Both the protrusions and the screw head have a radial length greater than the radial size of the clamping part.

5. A bolt for use in a liquid cargo system according to claim 3, wherein: Both the first and second bolts are hexagonal bolts.

6. A bolt for use in a liquid cargo system according to claim 1, characterized in that: The protrusions are annularly arranged at the circumferential side of both ends of the middle nut.

7. A bolt for use in a liquid cargo system according to claim 1, characterized in that: The side of the protrusion close to the screw head is a flat structure.

8. A bolt for use in a liquid cargo system according to claim 1, characterized in that: First guide inclined surfaces are formed at the ends of the first and second threaded grooves respectively.

9. A stud for use in a liquid cargo system according to claim 2, wherein Second guide inclined surfaces adapted to the first guide inclined surfaces are formed at the clamping parts of the first and second bolts respectively.

10. A bolt for use in a liquid cargo system according to claim 2, characterized in that: The space in the first and second threaded grooves is not connected, and a partition is arranged between the first and second threaded grooves. The thread directions of the first and second bolts, the first threaded groove and the second threaded groove are the same. Internal hexagonal grooves are formed at the end faces of the screw heads of the first and second bolts respectively. The supporting mechanism and the locking mechanism are in multiple groups, and the multiple groups of the supporting mechanism and the locking mechanism are annularly arranged at the circumferential side of the flange of the butterfly valve to be installed.

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