Lightweight double-layer pipe

Abstract

The utility model relates to the technical field of core rolling pipes, in particular to a light-weight double-layer pipe which comprises an inner pipe, an outer pipe and a pin, first annular protrusions are arranged on the outer side faces of the two ends of the inner pipe in the circumferential direction, second annular protrusions are arranged on the outer side face, between the first annular protrusions, of the inner pipe in the circumferential direction, and the number of the second annular protrusions is larger than or equal to 1. The outer diameter of the first annular protrusion and the outer diameter of the second annular protrusion are both equal to the inner diameter of the outer pipe, the first annular protrusion and the second annular protrusion are both integrally formed with the inner pipe, the outer pipe is arranged on the outer side of the inner pipe in a sleeving mode, the inner side face of the outer pipe is fixedly bonded with the first annular protrusion and the second annular protrusion, and a counter bore is formed in the outer side face of the first annular protrusion. Through holes are formed in the positions, corresponding to the counter bores, of the outer pipe, the pins are inserted into the through holes and the counter bores to be fixed, the ends of the pins are flush with the outer side face of the outer pipe, and the connecting structure is good in bending resistance and light in weight.

Description

Technical Field

[0001] This utility model relates to the field of core tube technology, specifically to a lightweight double-layer tube. Background Technology

[0002] After production, copper and aluminum foil need to be smoothly wound onto a core tube. The core tube is made of fiberglass. Because copper and aluminum foil have high density, the weight after winding is relatively heavy. Therefore, it is necessary to increase the wall thickness of the core tube to enhance its bending resistance. However, this results in a very heavy core tube, which is inconvenient to handle. Utility Model Content

[0003] To address the aforementioned technical shortcomings, this invention provides a lightweight double-layer tube with good bending resistance and light weight.

[0004] This utility model discloses a lightweight double-layer tube, including an inner tube, an outer tube, and a pin. A first annular protrusion is circumferentially arranged on the outer surface of both ends of the inner tube. A second annular protrusion is circumferentially arranged on the outer surface of the inner tube between the first annular protrusions. The number of second annular protrusions is greater than or equal to one. The outer diameters of the first and second annular protrusions are equal to the inner diameter of the outer tube. The first and second annular protrusions are integrally formed with the inner tube. The outer tube is sleeved on the outside of the inner tube, and the inner surface of the outer tube is bonded and fixed to the first and second annular protrusions. A countersunk hole is provided on the outer surface of the first annular protrusion. A through hole is provided on the outer tube corresponding to the countersunk hole. The pin is inserted into the through hole and the countersunk hole for fixation, and the end of the pin is flush with the outer surface of the outer tube.

[0005] The principle of the above technical solution is that the inner tube and the outer tube are separated by the first and second annular protrusions, which makes it lighter and thicker overall. The first and second annular protrusions can provide effective support. At the same time, the first and second annular protrusions are integrally formed with the inner tube, and the inner side of the outer tube is bonded and fixed to the first and second annular protrusions. The first annular protrusion is fixed to the outer tube by a pin, making its overall structure stable and thus giving it good bending resistance.

[0006] When the length of the double-layer tube is short, the number of the second annular protrusion is equal to 1. The second annular protrusion is located in the middle of the outer side of the inner tube. Reducing the number of the second annular protrusion can save costs while ensuring sufficient support.

[0007] When the double-layer tube is long, the number of second annular protrusions is equal to 2. The second annular protrusions are evenly arranged on the outer surface of the inner tube between the first annular protrusions, so that it has sufficient support.

[0008] The lightweight double-layer tube obtained by this invention has the following advantages: stable overall structure, good bending resistance, and light weight. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of Embodiment 1 of the present invention;

[0010] Figure 2 This is a cross-sectional view of Embodiment 2 of the present invention. Detailed Implementation

[0011] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0012] Example 1:

[0013] like Figure 1 As shown, this utility model discloses a lightweight double-layer tube, including an inner tube 1, an outer tube 3, and a pin 5. A first annular protrusion 4 is circumferentially arranged on the outer surface of both ends of the inner tube 1. A second annular protrusion 2 is circumferentially arranged at the middle position of the outer surface of the inner tube 1 between the first annular protrusion 4 and the second annular protrusion 2. The outer diameters of the first annular protrusion 4 and the second annular protrusion 2 are equal to the inner diameter of the outer tube 3. The first annular protrusion 4 and the second annular protrusion 2 are integrally formed with the inner tube 1. The outer tube 3 is sleeved on the outside of the inner tube 1, and the inner surface of the outer tube 3 is bonded and fixed to the first annular protrusion 4 and the second annular protrusion 2. A countersunk hole is provided on the outer surface of the first annular protrusion 4. A through hole is provided on the outer tube 3 corresponding to the countersunk hole. The pin 5 is inserted into the through hole and the countersunk hole for fixation, and the end of the pin 5 is flush with the outer surface of the outer tube 3.

[0014] The principle of the above technical solution is that the inner tube 1 and the outer tube 3 are separated by the first annular protrusion 4 and the second annular protrusion 2, which makes the weight lighter and the overall wall thickness thicker. The first annular protrusion 4 and the second annular protrusion 2 can provide effective support. At the same time, the first annular protrusion 4 and the second annular protrusion 2 are integrally formed with the inner tube 1, and the inner side of the outer tube 3 is bonded and fixed to the first annular protrusion 4 and the second annular protrusion 2. The first annular protrusion 4 is fixed to the outer tube 3 by the pin 5, so that the overall structure is stable and thus it has good bending resistance.

[0015] Example 2:

[0016] like Figure 2As shown, this utility model discloses a lightweight double-layer tube, including an inner tube 1, an outer tube 3, and pins 5. A first annular protrusion 4 is circumferentially arranged on the outer surface of both ends of the inner tube 1. A second annular protrusion 2 is circumferentially arranged on the outer surface of the inner tube 1 between the first annular protrusions 4. The number of second annular protrusions 2 is equal to 2. The second annular protrusions 2 are evenly arranged on the outer surface of the inner tube 1 between the first annular protrusions 4. The outer diameter of the first annular protrusion 4 and the outer diameter of the second annular protrusion 2 are equal to the inner diameter of the outer tube 3. The first annular protrusion 4 and the second annular protrusion 2 are integrally formed with the inner tube 1. The outer tube 3 is sleeved on the outside of the inner tube 1, and the inner surface of the outer tube 3 is bonded and fixed to the first annular protrusion 4 and the second annular protrusion 2. A countersunk hole is provided on the outer surface of the first annular protrusion 4. A through hole is provided on the outer tube 3 corresponding to the position of the countersunk hole. The pin 5 is inserted into the through hole and the countersunk hole for fixation. The end of the pin 5 is flush with the outer surface of the outer tube 3.

[0017] The principle of the above technical solution is that the inner tube 1 and the outer tube 3 are separated by the first annular protrusion 4 and the second annular protrusion 2, which makes the weight lighter and the overall wall thickness thicker. The first annular protrusion 4 and the second annular protrusion 2 can provide effective support. At the same time, the first annular protrusion 4 and the second annular protrusion 2 are integrally formed with the inner tube 1, and the inner side of the outer tube 3 is bonded and fixed to the first annular protrusion 4 and the second annular protrusion 2. The first annular protrusion 4 is fixed to the outer tube 3 by the pin 5, so that the overall structure is stable and thus it has good bending resistance.

Claims

1. A lightweight double-wall pipe, characterized by comprising: The utility model relates to a kind of pipe connector, including inner tube (1), outer tube (3), pin (5), the outer side of the both ends of inner tube (1) is provided with one annular protrusion (4) along the circumference, one annular protrusion (4) between the outer side of inner tube (1) is provided with two annular protrusions (2) along the circumference, the number of two annular protrusions (2) is greater than or equal to 1, the outer diameter of one annular protrusion (4), the outer diameter of two annular protrusions (2) are equal with the inner diameter of outer tube (3), one annular protrusion (4), two annular protrusions (2) are integrally formed with inner tube (1), outer tube (3) is set in the outer side of inner tube (1) and the inner side of outer tube (3) is bonded and fixed between one annular protrusion (4), two annular protrusions (2), the outer side of one annular protrusion (4) is provided with counterbore, outer tube (3) is provided with through hole on the position corresponding to counterbore, pin (5) is inserted in through hole and counterbore and is fixed, the end of pin (5) is flush with the outer side of outer tube (3).

2. The lightweight double-wall tube according to claim 1, wherein The number of two annular protrusions (2) is equal to 1, and two annular protrusions (2) are located at the middle position of the outer side of inner tube (1).

3. The light-weighted double-pipe according to claim 1, characterized by The number of two annular protrusions (2) is equal to 2, and two annular protrusions (2) are evenly arranged on the outer side of inner tube (1) between one annular protrusion (4).

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