CN217108763U - Marine gas double-wall pipe - Google Patents

Abstract

The utility model discloses a marine gas double-walled pipe, including outer tube (10) and inner tube (20) on this gas double-walled pipe structure be equipped with the elastic support device between outer tube (10) and inner tube (20), its structure is including three elastic support body (30) that set up along inner tube (20) circumference equipartition, elastic support body (30) one end is fixed part (31), and the other end is circular-arc supporting part (32), and three elastic support body (30) enclose through fixed part (31) separately and close the connection with the centre gripping on the outer wall of inner tube (20), the equal elastic support of supporting part (32) of three elastic support body (30) in on the inner wall of outer tube (10), each elastic support body (30) respectively through bolt (51) and self-locking nut (52) and adjacent elastic support body (30) fixed connection. The utility model discloses a triangle-shaped vane type structure sets up and lies in between inner tube and outer tube, and it is many to have the strong characteristics of strong with stability of strong, the space deformation.

Description

Marine gas double-wall pipe

Technical Field

The utility model relates to a shipbuilding technical field especially relates to a marine gas double-walled pipe, and this double-walled pipe is with elasticity inner support separate.

Background

Gas fuels such as methane and ethane have become another main fuel for marine engines due to their high efficiency and clean characteristics. Because such gas fuels are inflammable and explosive, according to the regulations of IGC CODE International Structure and Equipment rules for bulk transport of liquefied gas, a gas supply system of a gas engine must be in the form of a double-walled pipe to prevent gas from leaking into the interior of a cabin, thereby ensuring safe operation of the ship. The gas double-wall pipe comprises an inner pipe and an outer pipe which are coaxially arranged, the inner pipe is used for gas operation, and an annular gap between the inner pipe and the outer pipe is connected with the atmosphere. Because the gas pressure of the inner pipe of the gas double-wall pipe is up to dozens of MPa, and the temperature is as low as minus dozens of degrees, the double-wall pipe is in low-frequency vibration for a long time when a ship runs, and elastic support is needed between the inner pipe and the outer pipe to absorb huge stress and thermal expansion displacement between the inner pipe and the outer pipe caused by temperature difference, pressure difference and vibration; and these vibratory displacements occur over 360 deg. of the pipeline cross-section.

The present prior art, such as the utility model CN 206582416U, discloses an elastic support for a high-pressure gas double-wall pipe, and CN 209959371U discloses a flexible support assembly for a double-wall pipe of a dual-fuel engine, in the above prior art, the basic structural style of the elastic inner support between the double-wall pipes is a two-piece symmetrical structure, and the following problems exist: (1) because two symmetrical structures, the supporting part of the elastic support body of the structure extends for a long distance, and the difference of the elastic coefficient K values of the far end and the root part is large, so that the support has different vibration absorption capacity in the 360-degree direction of the circumference, and the problem that the two adjacent elastic supports are staggered by 90 degrees in the installation direction during installation is solved, but the problem still exists in the position of some bent pipes. (2) The elastic support body is in a full-surrounding structure, is not beneficial to being manufactured in a large scale by adopting a simple die pressing process, and has to be bent step by step, so that the manufacturing cost is increased, and the manufacturing precision is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, in order to solve the problems in the background art, the present invention provides a novel marine double-wall pipe structure. The utility model discloses a marine double-walled pipe structure will receive the balanced stability of atress, realizes the steady operation of gas double-walled pipe. The double-wall pipe has wide application range, the ship tends to be built in a large scale, the caliber of the pipe is increased, and the requirements on the stability, the pressure resistance and the expansion coefficient of the inner pipe support are required to be higher.

Based on the technical scheme, the utility model provides a technical scheme as follows:

the utility model provides a marine gas double-walled pipe, is including outer tube and inner tube on this gas double-walled pipe structure, the inner tube with the axle center set up in the outer tube be equipped with the elastic support device between outer tube and the inner tube, this elastic support device is structural including the three elastic support body that sets up along inner tube circumference equipartition, elastic support body one end is the fixed part, and the other end is circular-arc supporting part, and three elastic support body encloses through fixed part separately and closes the connection with the centre gripping on the outer wall of inner tube, the equal elastic support of supporting part of three elastic support body in on the inner wall of outer tube, each elastic support body is respectively through bolt and auto-lock nut and adjacent elastic support body fixed connection. The elastic support device is arranged between the inner pipe and the outer pipe as a triangular blade type structure, and has the advantages of more supporting points, smaller space deformation and strong stability.

The utility model discloses an in the marine gas double-walled pipe, the fixed part middle part of the elastic support body is equipped with and is circular-arc-shaped arc wall, and the internal diameter of this arc wall slightly is greater than the external diameter of inner tube respectively is equipped with an outside position of buckling at the both ends of arc wall, all is equipped with the confession on every position of buckling the round hole that the bolt passed, one of them buckle the position and connect the supporting part.

The utility model discloses an in marine gas double-walled pipe in the fixed part of the elastic support body, be equipped with the hem at the end of a position of buckling that is not connected with the supporting part, this hem turns over to the fixed part direction on the adjacent elastic support body.

The utility model discloses an in the marine gas double-walled pipe, a position elastic connection of buckling in the fixed part of the elastic support body the supporting part, the diameter of this supporting part slightly is greater than the internal diameter of outer tube, this supporting part supports after elasticity is bent on the inner wall of outer tube.

The utility model discloses an in the marine gas double-walled pipe, the elastic support body is bent by a stainless spring steel band and forms the integral type structure, and this elastic support body is hem, the position of buckling, arc wall, the position of buckling and supporting part respectively from inside to outside, the arc wall and the position of buckling of both sides as the fixed part.

The utility model relates to an among the marine gas double-walled pipe, be equipped with three round hole on the elastic support body, be first round hole, second round hole and third round hole respectively, wherein first round hole is in and keeps away from the position of buckling of supporting part position, second round hole are in the connection the position of buckling of supporting part, the arc cushion is installed to the tip of supporting part, third round hole department on the supporting part with the connection position of arc cushion.

The utility model discloses an in marine gas double-walled pipe arc cushion is installed to the tip of supporting part, the supporting part of the elastic support body contacts through the inner wall of arc cushion and outer tube and realizes elastic support.

The utility model discloses an in marine gas double-walled pipe, be equipped with on the arc cushion with the outside matched with recess of supporting part, the recess as the reverse keying of fluting structure, reduce the fracture that the expend with heat and contract with cold condition caused and drop.

The utility model discloses an in marine gas double-walled pipe, as more optimal design, still be equipped with the reference column on the arc cushion, this reference column imbeds to the third round hole of the elastic support body to be in the same place arc cushion and elastic support body coupling are fixed.

The utility model discloses an in the marine gas double-walled pipe, the preparation material of arc cushion is special fluorine dragon.

Based on the technical scheme, the utility model discloses a marine gas double-walled pipe compares with prior art's gas double-walled pipe structure, has gained following beneficial effect through practical application:

1. the utility model discloses an among the marine gas double-walled pipe, the elastic support device lies in between inner tube and outer tube as the setting of triangle-shaped vane type structure, and the strong point of support is many, and the space deformation is less, and stability is strong to can the huge stress and the thermal energy displacement that the effective absorption double-walled pipe arouse because of difference in temperature, pressure differential, vibration, make the double-walled pipe inner tube more even at 360 holding power that bear of circumference.

2. The utility model discloses an elastic support body is bent by a stainless spring steel band and forms the integral type structure in the marine gas double-walled pipe, and its preparation mould suppression of being convenient for makes easily, economic nature is good to make boats and ships air supply system can long-term safe operation.

3. The utility model discloses a marine gas double-walled pipe product adopts the embedded installation of ASTM material structure and special gasket, has outstanding anti-sway nature, portability and prevents bolt fracture fail safe nature, but wide application in double fuel piping transport items such as LNG ship, double-fuel ship, land tank.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is the internal structure schematic diagram of the marine gas double-wall pipe of the present invention.

Fig. 2 is a sectional view taken along line a-a of fig. 1.

Fig. 3 is a schematic view of the front view structure of the elastic support body in the marine gas double-wall pipe.

Fig. 4 is a view from direction B in fig. 3.

Fig. 5 is a view in the direction of C in fig. 3.

Fig. 6 is the structural schematic diagram of the arc-shaped cushion block in the marine gas double-wall pipe of the utility model.

Fig. 7 is a cross-sectional view taken along line D-D in fig. 6.

FIG. 8 is a graph showing the distribution and the modulus of elasticity K obtained in tests of the double-wall tube of the prior art.

Fig. 9 is a schematic diagram of the elasticity coefficient K and the distribution obtained in the test of the marine gas double-wall pipe of the present invention.

The reference numerals in the figures have the meaning:

10: outer tube, 20: inner tube, 30: elastic support body, 31: fixing section, 32: a support portion; 33: arc-shaped groove, 34: folding, 35: first circular hole, 36: second circular hole, 37: third round hole, 40: arc cushion, 41: groove, 42: positioning post, 51: bolt, 52: self-locking nut

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings. It should be clear that the described embodiments are only some, but not all embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. The present application is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The utility model provides a marine gas double-walled pipe specifically is an adopt marine gas double-walled pipe of three-piece formula elasticity inner support. The structural design can ensure that the supporting force born by the double-wall pipe inner pipe at 360 degrees of the circumference is more uniform, and the arrangement is convenient; the elastic support body structure is convenient for die pressing, easy to manufacture and good in economical efficiency, so that the ship gas supply system can run safely for a long time.

Specifically, as shown in fig. 1 and 2, the present invention is a gas double-wall pipe for a ship, the gas double-wall pipe structure comprises an outer pipe 10 and an inner pipe 20, an elastic support device is arranged between the outer pipe 10 and the inner pipe 20, so that the inner pipe 20 is coaxially arranged in the outer pipe 10, the elastic support device structurally comprises three elastic support bodies 30 which are uniformly distributed along the circumference of an inner tube 20, one end of each elastic support body 30 is used as a fixing part 31, the other end of each elastic support body is used as an arc-shaped supporting part 32, the three elastic support bodies 30 are respectively surrounded and connected through the respective fixing parts 31 to be clamped on the outer wall of the inner tube 20, the supporting parts 32 of the three elastic support bodies 30 are elastically supported on the inner wall of the outer tube 10, and each elastic support body 30 is fixedly connected with the adjacent elastic support body 30 through a bolt 51 and a self-locking nut 52. The elastic support device is arranged between the inner tube 20 and the outer tube 10 as a triangular blade type structure, and has the characteristics of more support points, smaller spatial deformation and strong stability.

As shown in fig. 3 to 5, an arc-shaped groove 33 is formed in the middle of the fixing portion 31 of the elastic support body 30, two ends of the arc-shaped groove 33 are respectively provided with an outward bending portion, each bending portion is provided with a round hole for the bolt 51 to pass through, one bending portion is connected with the supporting portion 32 in the fixing portion 31 of the elastic support body 30, a folded edge 34 is formed at the end of one bending portion which is not connected with the supporting portion 32, and the folded edge 34 is folded toward the fixing portion 31 of the adjacent elastic support body 30 to support. One bending part of the fixing part 31 of the elastic support body 30 is elastically connected to the supporting part 32, the diameter of the supporting part 32 is slightly larger than the inner diameter of the outer tube 10, so that elastic compression pretightening force can be provided, and the supporting part 32 is elastically bent and then supported on the inner wall of the outer tube 10.

As shown in fig. 3, the elastic support body 30 is an integral structure formed by bending a single stainless steel spring strip, the elastic support body 30 includes a folded edge 34, a bent portion, an arc-shaped groove 33, a bent portion and a support portion 32 from the inside to the outside, and the arc-shaped groove 33 and the bent portions on both sides are used as fixing portions 31. The integrally designed elastic support body 30 is convenient for die pressing during manufacturing, and has the characteristics of easy manufacturing and good economical efficiency, so that the ship gas supply system can safely operate for a long time. The elastic support body 32 is provided with three circular holes, namely a first circular hole 35, a second circular hole 36 and a third circular hole 37, wherein the first circular hole 35 is close to the folded edge 34 of the edge, the first circular hole 35 is overlapped with the second circular hole 36 on the adjacent elastic support body 30 for the bolt 51 to pass through, and the bolt 51 is screwed with the self-locking nut 52 to fixedly connect the adjacent elastic support body 30. The second round hole 36 is located at the bending part connected with the support part 32, the second round hole 36 is overlapped with the first round hole 35 on the adjacent elastic support body 30 for the bolt 51 to pass through, and the bolt 51 is screwed with the self-locking nut 52 to fixedly connect the adjacent elastic support body 30. The third circular hole 37 is located at the connecting portion of the support portion 32 and the arc-shaped pad 40.

As shown in fig. 6 and 7, in the marine gas double-wall pipe of the present invention, the arc-shaped pad 40 is installed at the end of the supporting portion 32, and the supporting portion 32 of the elastic support body 30 is in contact with the inner wall of the outer pipe 10 through the arc-shaped pad 40 to realize elastic support. The arc cushion block 40 is provided with a groove matched with the outer side of the supporting part 32, and the groove is used as a slotted reverse locking structure to reduce the fracture and the falling caused by the expansion with heat and contraction with cold. In order to further enhance the connection and fixation, the arc-shaped pad 40 is provided with a positioning post 42, and the positioning post 42 is embedded into the third round hole 37 on the elastic support body 30, so that the arc-shaped pad 40 and the elastic support body 30 are fixed together. The arc cushion block 40 is made of Teflon, and the arc cushion block 40 made of Teflon has good low temperature resistance and ageing resistance.

The utility model discloses a supporting part 32 of elastic support body 30 is shorter than the supporting part among the prior art among the elastic support device to it is three respectively on the circumference, that is to say between outer tube 10 and inner tube 20, elastic support body 30 be provided with threely, a circular supporting layer is constituteed to three elastic support body 30 interconnect nestification. Relative to the three elastic support bodies 30, three fixing parts 31 enclosing into a circular support layer are also arranged, three corresponding supporting parts 32 connected together are also arranged, 3 arc-shaped grooves 33 used for clamping the inner pipe 20 are also arranged, and each arc-shaped groove 33 of the 3 arc-shaped grooves is close to 60 degrees of radian, so that the outer wall of the inner pipe 20 is enclosed into a circle basically. 3 folding edges 34 connected with the 3 arc-shaped grooves 33 are arranged, and three folding edges 34 are folded towards the direction of the fixing part 31 on the adjacent elastic support body 30 to play a supporting role. For the three elastic support bodies 30, 3 first round holes 35, 3 second round holes 36 and 3 third round holes 36 are arranged, wherein the first round holes 35, the second round holes 36 and the third round holes 36 are enclosed into a circular support layer. For three elastic support body 30, arc cushion 40 also is provided with 3, because all be equipped with a recess 41 and a reference column 42 on every arc cushion 40, then the recess 41 on 3 arc cushions 40 also has 3, and 3 reference columns 42 on the arc cushion 40 are provided with 3. Similarly, for the three elastic support bodies 30, the number of the bolts 51 is 3, and the number of the self-locking nuts 52 is 3. Therefore, the elastic coefficient K value in each direction is more uniform and is more stable and reliable in use.

Aiming at the two-piece type support design in the existing design, an elasticity coefficient value experiment is carried out, the obtained elasticity coefficient K value result is shown in fig. 8 and fig. 9, and the figure shows that if the two-piece type elasticity coefficient K value is 60-315 KN/m and the three-piece type elasticity coefficient K value is 235-315 KN/m of a specification support adopted by the experiment, the arrangement is more convenient than the existing two-piece type design, the stress condition is more balanced, and the stress distribution is more uniform. The deformation phenomenon caused by uneven stress distribution is not easy to occur like the prior art.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A fuel gas double-wall pipe for a ship comprises an outer pipe (10) and an inner pipe (20), wherein the inner pipe (20) is coaxially arranged in the outer pipe (10), it is characterized in that an elastic support device is arranged between the outer pipe (10) and the inner pipe (20), the elastic support device structurally comprises three elastic support bodies (30) which are uniformly distributed along the circumference of an inner pipe (20), the elastic support comprises elastic support bodies (30), wherein one end of each elastic support body (30) is a fixing portion (31), the other end of each elastic support body is an arc-shaped supporting portion (32), the three elastic support bodies (30) are connected in a surrounding mode through the fixing portions (31) respectively and clamped on the outer wall of the inner pipe (20), the supporting portions (32) of the three elastic support bodies (30) are elastically supported on the inner wall of the outer pipe (10), and each elastic support body (30) is fixedly connected with the adjacent elastic support body (30) through a bolt (51) and a self-locking nut (52).

2. The marine gas double-walled pipe according to claim 1, wherein the middle of the fixing portion (31) of the elastic support body (30) is provided with an arc-shaped groove (33), the inner diameter of the arc-shaped groove (33) is slightly larger than the outer diameter of the inner pipe (20), two ends of the arc-shaped groove (33) are respectively provided with an outward bending portion, each bending portion is provided with a round hole for the bolt (51) to pass through, and one bending portion is connected with the supporting portion (32).

3. A marine gas double-walled pipe according to claim 2, wherein in the fixing portion (31) of the elastic bracket body (30), a folded edge (34) is provided at an end of a folded portion which is not connected to the support portion (32), and the folded edge (34) is folded toward the fixing portion (31) of the adjacent elastic bracket body (30).

4. The marine gas double-wall pipe according to claim 3, wherein a bent portion of the fixing portion (31) of the elastic bracket body (30) is elastically connected to the supporting portion (32), the diameter of the supporting portion (32) is slightly larger than the inner diameter of the outer pipe (10), and the supporting portion (32) is elastically bent and supported on the inner wall of the outer pipe (10).

5. The marine gas double-walled pipe according to claim 4, wherein the elastic support body (30) is a stainless steel spring strip bent to form an integral structure, the elastic support body (30) is respectively provided with a folded edge (34), a bent portion, an arc-shaped groove (33), a bent portion and a support portion (32) from inside to outside, and the arc-shaped groove (33) and the bent portions on both sides are used as the fixing portions (31).

6. The marine gas double-wall pipe according to claim 5, wherein three circular holes are formed in the elastic support body (30), namely a first circular hole (35), a second circular hole (36) and a third circular hole (37), wherein the first circular hole (35) is located at a bending position away from the support portion (32), the second circular hole (36) is located at a bending position connected with the support portion (32), an arc-shaped cushion block (40) is mounted at an end of the support portion (32), and the third circular hole (37) is located at a connecting position of the support portion (32) and the arc-shaped cushion block (40).

7. The marine gas double-wall pipe according to claim 6, wherein the support portion (32) of the elastic support body (30) is elastically supported by the contact of the arc-shaped spacer (40) with the inner wall of the outer pipe (10).

8. The marine gas double-wall pipe according to claim 7, wherein the arc-shaped spacer (40) is provided with a groove which is matched with the outer side of the support part (32) and is used as a slotted reverse locking structure.

9. The marine gas double-wall pipe as recited in claim 8, wherein the arc-shaped cushion block (40) is further provided with a positioning column (42), and the positioning column (42) is inserted into a third round hole (37) of the elastic support body (30) to fix the arc-shaped cushion block (40) and the elastic support body (30) together.

10. Gas double-walled pipe for ships according to claim 7, 8 or 9, characterized in that the arc-shaped spacer (40) is made of teflon.

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