Double-wall pipe

Abstract

The utility model provides a double-wall pipe which comprises an inner pipe and an outer pipe which are coaxially arranged, the double-wall pipe further comprises supporting pieces and contact pieces, the supporting pieces are evenly arranged along the axis of the inner pipe, the supporting pieces are arranged around the inner pipe, and one side of each supporting piece is fixedly connected with the outer wall of the inner pipe; the contact piece is fixedly connected with the side, away from the outer wall of the inner pipe, of the supporting piece, and the contact piece is made of plastic materials. And a tightened connecting band is arranged between every two adjacent contact pieces. The utility model solves the problems that the metal piece and the inner wall of the outer pipe are easy to generate sparks due to friction, the safety of gas transportation is influenced, and the inner pipe and the outer pipe are clamped when being assembled, and improves the practicability and the safety.

Description

Technical Field

[0001] The utility model relates to the technical field of pipelines, in particular to a double-wall pipe. Background Art

[0002] According to the requirements of shipbuilding codes, pipelines for transporting hazardous gas fuels should use double-wall pipes to prevent the possibility of danger caused by leakage. The double-wall pipe is divided into an outer pipe and an inner pipe. The inner pipe transports gas fuel, and the outer pipe is installed outside the inner pipe to form a double-layer protection. There are various support forms between the inner and outer pipes. The spiral elastic support is easy to install and use, but expensive. If a metal part is directly welded to the inner pipe to support the outer pipe, friction is likely to occur between the metal part and the outer pipe, which may cause sparks and pose a danger. In addition, when the inner pipe and the metal part are inserted into the inner part of the outer pipe, the inner pipe and the outer pipe must always be kept coaxial. Otherwise, after the outer pipe is offset, it will be blocked by the metal part, affecting the relative axial movement of the inner pipe and the outer pipe. Summary of the Utility Model

[0003] Aiming at the deficiencies in the prior art, the utility model provides a double-wall pipe, which solves the problems in the prior art that friction is likely to occur between the metal part and the inner wall of the outer pipe, which is likely to generate sparks and affect the safety of gas transportation, and that the inner pipe and the outer pipe will be stuck during assembly.

[0004] According to an embodiment of the utility model, a double-wall pipe includes an inner pipe and an outer pipe arranged coaxially, and further includes a support member and a contact member. The support members are uniformly arranged along the axis of the inner pipe, and a plurality of support members are also arranged around the inner pipe. One side of the support member is fixedly connected to the outer wall of the inner pipe; the contact member is fixedly connected to the side of the support member away from the outer wall of the inner pipe, and the contact member is made of a plastic material; a tightened connecting band is arranged between adjacent contact members.

[0005] Preferably, the support member is a sheet-like structure, the plane where the support member is located passes through the axis of the inner pipe, the support member is welded to the inner pipe, and an installation hole is arranged on one side of the contact member, and one side of the support member is inserted into the installation hole.

[0006] Preferably, a guiding angle is arranged on the side edge of the end face of the contact member close to the inner wall of the outer pipe.

[0007] Preferably, the support member is a block-like structure, and there is an inclined surface on the side of the support member away from the inner pipe. The contact member is slidably connected to the inclined surface, so that when the inner pipe rotates relative to the outer pipe, the contact member slides along the inclined surface from the shorter side of the support member to the longer side.

[0008] Preferably, sliding grooves are arranged on both sides of the support member in the axial direction relative to the inner pipe, and the sliding grooves intersect with the tangent line of the inner pipe; the contact member is slidably connected to the sliding grooves.

[0009] Preferably, the contact member is made of nylon; the support member is made of flat steel; the gap between the contact member and the inner wall of the outer tube is equal to or less than one millimeter; the support member is provided with three or four pieces around the inner tube; the axial spacing distance of the support member along the inner tube is less than three meters.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the structure of the utility model is simple. After the support members are sequentially fixed on the outer wall of the inner tube, the contact members can be fixed at the ends of the support members. When the inner tube is inserted into the outer tube, the contact members made of plastic come into contact with or rub against the inside of the outer tube, thereby reducing or avoiding the risk of spark ignition of the gas. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a schematic diagram of the sliding groove of the utility model.

[0013] In the above-mentioned drawings: 1, inner tube; 2, outer tube; 3, support member; 4, contact member; 5, connecting band; 6, chamfer; 7, sliding groove; 8, inclined surface. Detailed Embodiments

[0014] The technical solutions in the utility model will be further described below with reference to the drawings and embodiments.

[0015] As Figure 1 shown, an embodiment of the utility model provides a double-wall tube, in which the inner tube 1 and the outer tube 2 are coaxially arranged, and further includes a support member 3 and a contact member 4. The support member 3 is uniformly arranged along the axis of the inner tube 1, and several support members 3 are also arranged around the inner tube 1. One side of the support member 3 is fixedly connected to the outer wall of the inner tube 1. The contact member 4 is fixedly connected to the side of the support member 3 away from the outer wall of the inner tube 1, and there is a gap between the other side of the contact member 4 and the inner wall of the outer tube 2. The contact member 4 is made of a plastic material. A tightened connecting band 5 is arranged between adjacent contact members 4.

[0016] When the inner tube 1 is inserted into the outer tube 2, the end face of the contact member 4 away from the inner tube 1 contacts the inner wall of the outer tube 2. When the plastic contact member 4 makes frictional contact with the outer tube 2, no spark will be generated. When the inner tube 1 is inserted into the outer tube 2 and the end of the outer tube 2 is offset, the end of the outer tube 2 will move closer to and contact the inner tube 1. When the end of the outer tube 2 contacts and slides on the outer wall of the inner tube 1, the end of the outer tube 2 will be blocked by the contact member 4 and cannot move forward. The connecting belt 5 prevents the end of the outer tube 2 from contacting the inner tube 1 at the position between the two contact members 4, and the connecting belt 5 prevents the side wall of the end of the outer tube 2 from contacting the inside, avoiding wear on the inner tube 1 when the end of the outer tube 2 rubs against the inside. At the same time, the connecting belt 5 prevents the outer tube 2 from getting stuck when contacting the support member 3 and blocking the inner tube 1 from continuing to move into the outer tube 2. The end of the connecting belt 5 is connected to the end face of the contact member 4 away from the inner tube 1.

[0017] Preferably, the support member 3 is in a sheet-like structure, the plane where the support member 3 is located passes through the axis of the inner tube 1, the support member 3 is welded to the inner tube 1, the contact member 4 is in a block-like structure, and an installation hole is provided on one side of the contact member 4. One side of the support member 3 can be inserted into the installation hole. Using the sheet-like structure to support the support member 3 can avoid increasing the overall weight of the double-wall tube. During installation, the contact member 4 can be sleeved on the end of the support member 3. The installation hole has a certain depth, and when the outer tube 2 rubs against the top of the support member 3, this friction will not drive the contact member 4 and the support member 3 to separate.

[0018] Preferably, a chamfer is provided on the side of the end face of the contact member 4 close to the inner wall of the outer tube 2. When the outer tube 2 moves forward to contact the contact member 4, the axes of the outer tube 2 and the inner tube 1 will move and deviate. The port of the outer tube 2 contacts the chamfer 6 position, and the chamfer 6 plays a guiding role, enabling the contact member 4 to slide into the inner part of the outer tube 2.

[0019] Preferably, the support member 3 is in a block-like structure, and there is an inclined surface 8 on the side of the support member 3 away from the inner tube 1. The contact member 4 is slidably connected to the inclined surface 8, so that when the inner tube 1 rotates relative to the outer tube 2, the contact member 4 slides along the inclined surface 8 from the shorter side to the longer side of the support member 3. When the inner tube 1 is inserted into the outer tube 2 and the inner tube 1 rotates, and then part of the contact member 4 contacts the inner wall of the outer tube 2, the contact member 4 slides along the inclined surface 8, and then the distance between the contact member 4 and the outer tube 2 decreases, making the connection between the inner tube 1 and the outer tube 2 tighter.

[0020] As Figure 2 As shown, preferably, sliding grooves 7 are provided on both sides of the support member 3 in the axial direction relative to the inner tube 1, and the sliding grooves 7 intersect with the tangent line of the inner tube 1. The contact member 4 is slidably connected to the sliding grooves 7. In this embodiment, the included angle between the sliding grooves 7 and the tangent line of the inner tube 1 is ten degrees.

[0021] Preferably, the contact member 4 is made of nylon. The support member 3 is made of flat steel, which is a formed material and can be used after being cut. The clearance between the contact member 4 and the inner wall of the outer tube 2 is equal to or less than one millimeter. When the inner tube 1 is inserted into the outer tube 2, there is a clearance between the contact member 4 and the inner wall of the outer tube 2 to avoid difficult installation. At the same time, the clearance should not be too large to avoid the need for the outer tube 2 to be bent significantly before being supported by the contact member 4. The support member 3 is provided with three or four pieces around the inner tube 1. The number of contact members 4 on the support member 3 is such that the outer tube 2 and the inner tube 1 can remain coaxial. The axial spacing distance of the support member 3 along the inner tube 1 is less than three meters. Dense support members 3 will increase the manufacturing cost. A spacing of three meters between adjacent support members 3 can ensure that the bending beam generated by the outer tube 2 does not contact the outer surface of the inner tube 1.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A double-walled tube, comprising an inner tube (1) and an outer tube (2) arranged coaxially, characterized in that: It also comprises a support member (3) and a contact member (4), wherein the support member (3) is evenly arranged along the axis of the inner tube (1), and a plurality of support members (3) are arranged around the inner tube (1), one side of the support member (3) is fixedly connected to the outer wall of the inner tube (1); the contact member (4) is fixedly connected to the side of the support member (3) away from the outer wall of the inner tube (1), and the contact member (4) is made of plastic material; and a tightened connecting belt (5) is arranged between adjacent contact members (4).

2. A double-walled pipe according to claim 1, characterized in that: The support member (3) is a sheet-like structure, the plane where the support member (3) is located passes through the axis of the inner tube (1), the support member (3) and the inner tube (1) are welded, and a mounting hole is provided on one side of the contact member (4), and one side of the support member (3) is inserted into the mounting hole.

3. A double-walled pipe according to claim 1, characterized in that: A lead-in angle is provided on the side edge of the end surface of the contact piece (4) close to the inner wall of the outer tube (2).

4. A double-walled pipe according to claim 1, characterized in that: The support member (3) is a block-shaped structure. A side of the support member (3) away from the inner tube (1) is provided with an inclined surface (8). The contact member (4) is slidably connected to the inclined surface (8), so that when the inner tube (1) rotates relative to the outer tube (2), the contact member (4) slides along the inclined surface (8) from the shorter side of the support member (3) to the longer side.

5. A double-walled pipe as claimed in claim 4, characterized in that: The support member (3) is provided with sliding grooves (7) on both sides in the axial direction relative to the inner tube (1), and the sliding grooves (7) and the tangent lines of the inner tube (1) intersect; the contact member (4) and the sliding grooves (7) are slidably connected.

6. A double-walled pipe according to claim 1, characterized in that: The contact piece (4) is made of nylon; the support piece (3) is made of flat steel; the gap between the contact piece (4) and the inner wall of the outer tube (2) is equal to or less than one millimeter; three or four support pieces (3) are arranged around the inner tube (1); the support pieces (3) are spaced apart along the axial direction of the inner tube (1) at a distance of less than three meters.

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