A D-tube

Abstract

The utility model relates to the field of pipe fittings, especially a D-shaped pipe, which mainly solves the problems of low installation convenience and poor installation firmness in the prior art, comprising a pipe body with a D-shaped structure in cross section, the pipe body has an arc-shaped part, a rectangular part and a connecting part connecting the arc-shaped part and the rectangular part, the arc-shaped part, the rectangular part and the connecting part are an integral structure, the arc-shaped part has an arc surface with a semicircular structure in cross section, the rectangular part has three flat surfaces with a "" U-shaped structure in cross section, the connecting part has two inclined surfaces, the side wall thickness of the flat surface is 1.2-1.5 times that of the side wall thickness of the arc surface, the inner wall of the flat surface is provided with reinforcing ribs distributed along the axial direction of the pipe body, and the inner wall of the arc surface is provided with at least two spiral flow guide lines.

Description

Technical Field

[0001] This utility model relates to the field of pipe fittings, and in particular to a D-shaped pipe. Background Technology

[0002] Plastic pipe fittings are generally made from synthetic resin, specifically polyester, with the addition of stabilizers, lubricants, and plasticizers, through extrusion processing in a pipe-making machine. They are mainly used for piping in building water supply systems, drainage, ventilation, and sewage systems; underground drainage systems; rainwater pipes; and conduits for electrical wiring. Plastic pipe fittings are divided into two main categories: thermoplastic pipes and thermosetting plastic pipes. Thermoplastic pipes include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and polyoxymethylene (POM) pipes; thermosetting pipes include phenolic plastic pipes.

[0003] Existing plastic pipe fittings all have circular cross-sections. When installing them, the wall needs to be excavated into deep grooves, and there are gaps between parallel pipes. Mortar needs to be filled to ensure the corrosion resistance of the plastic pipe fittings, protect the pipes, and extend their service life. This results in low installation convenience and poor installation stability. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a D-shaped tube, which mainly solves the problems of low installation convenience and poor installation firmness of the existing circular tube.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A D-shaped tube includes a tube body with a D-shaped cross-section. The tube body has an arc-shaped portion, a rectangular portion, and a connecting portion connecting the arc-shaped portion and the rectangular portion. The arc-shaped portion, the rectangular portion, and the connecting portion are integral structures. The arc-shaped portion has an arc surface with a semi-circular cross-section. The rectangular portion has three straight surfaces with a U-shaped cross-section. The connecting portion has two inclined surfaces. The sidewall thickness of the straight surfaces is 1.2 to 1.5 times the sidewall thickness of the arc surface. The inner wall of the straight surfaces is provided with reinforcing ribs distributed along the axial direction of the tube body. The inner wall of the arc surface is provided with at least two spiral guide lines.

[0007] Furthermore, the tube body includes an inner layer, an outer layer, and a metal layer distributed between the inner and outer layers. The metal layer has through holes distributed in a matrix, and the inner and outer layers are connected at the through holes.

[0008] Furthermore, the inner layer and the rectangular portion are provided with rectangular through grooves that extend through the tube in the axial direction.

[0009] Furthermore, a rounded corner structure is provided between adjacent inclined surfaces and straight surfaces, and the transition arc radius of the rounded corner structure is not less than 3mm.

[0010] Furthermore, the angle between the inclined surface of the connecting part and the horizontal plane is 65 to 85 degrees, and the length of the inclined surface accounts for 1 / 10 to 1 / 8 of the height of the pipe body.

[0011] Furthermore, the number of reinforcing ribs is 3 to 5, the rib height is 1.5 to 2.5 mm, the rib width is 4 to 6 mm, and the distance between adjacent reinforcing ribs is 1 / 8 to 1 / 6 of the circumference of the tube.

[0012] Furthermore, the pitch of the spiral guide pattern is 30-50mm, the cross-section of the guide pattern is semi-elliptical, and the height is 0.8-1.2mm.

[0013] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This D-shaped pipe significantly reduces the depth of wall grooves through its D-shaped cross-section, improving the convenience of pre-embedded construction; the differentiated wall thickness design enhances structural strength and effectively resists external pressure; and the built-in reinforcing ribs greatly improve the axial bearing capacity of the pipe body; at the same time, the spiral flow guiding structure optimizes fluid dynamics performance and maintains water conveyance efficiency. Attached Figure Description

[0014] Figure 1 This is a front view structural diagram of an embodiment of the present utility model;

[0015] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0016] Figure 3 This is a three-dimensional structural diagram of the arc-shaped part in an embodiment of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the metal layer in an embodiment of this utility model. Detailed Implementation

[0018] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] The embodiment of this utility model is as follows:

[0020] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a D-shaped tube includes a tube body 1 with a D-shaped cross-section. The tube body 1 has an arc-shaped portion 11, a rectangular portion 12, and a connecting portion 13 connecting the arc-shaped portion 11 and the rectangular portion 12. The arc-shaped portion 11, the rectangular portion 12, and the connecting portion 13 are integral structures. The arc-shaped portion 11 has an arc surface 101 with a semi-circular cross-section. The rectangular portion 12 has three flat surfaces 102 with a U-shaped cross-section. The connecting portion 13 has two inclined surfaces 103. The sidewall thickness of the flat surface 102 is 1.2 to 1.5 times that of the sidewall thickness of the arc surface 101, preferably 1.3 times. The inner wall of the flat surface 102 is provided with reinforcing ribs 2 distributed along the axial direction of the tube body 1. The inner wall of the arc surface 101 is provided with five spiral guide lines 3.

[0021] This D-shaped pipe significantly reduces the depth of wall grooves through its D-shaped cross-section, improving the convenience of pre-embedded construction; the differentiated wall thickness design enhances structural strength and effectively resists external pressure; and the built-in reinforcing ribs 2 greatly improve the axial load-bearing capacity of the pipe body; at the same time, the spiral guide pattern 3 structure optimizes fluid dynamics performance and maintains water delivery efficiency.

[0022] Furthermore, the pipe body 1 includes an inner layer 10, an outer layer 20, and a metal layer 30 distributed between the inner layer 10 and the outer layer 20. The metal layer is made of aluminum. The metal layer 30 has through holes 40 arranged in a matrix. The inner layer 10 and the outer layer 20 are connected at the through holes. The sandwich metal structure improves the overall rigidity of the pipe. The through hole 40 design achieves a stable bond between the layers and prevents delamination. The metal layer 30 effectively blocks gas permeation and extends the service life.

[0023] Furthermore, the inner layer 10 and the rectangular portion 12 are provided with rectangular through grooves 4 that are distributed in the axial direction of the pipe body 1, which enhances the flexibility of the pipe, facilitates on-site bending construction, and forms a stress buffer channel to reduce the risk of joint leakage.

[0024] It is worth noting that a rounded corner structure 5 is provided between adjacent inclined surfaces 103 and flat surfaces 102. The transition arc radius of the rounded corner structure 5 is not less than 3mm, which smooths the transition, reduces stress concentration, improves pressure resistance, optimizes fluid direction, and reduces local turbulence loss.

[0025] Furthermore, the inclined surface 103 of the connecting part 13 forms an angle of 65 to 85 degrees with the horizontal surface 102, preferably 75 degrees. The length of the inclined surface 103 accounts for 1 / 10 to 1 / 8 of the height of the tube body 1, preferably 1 / 10. The specific angle design balances lateral support and material utilization, optimizes the structural weight distribution, and achieves lightweight design.

[0026] In this embodiment, the number of reinforcing ribs 2 is 3 to 5, preferably 5. The rib height is 1.5 to 2.5 mm, preferably 1.8 mm, and the rib width is 4 to 6 mm, preferably 4 mm. The spacing between adjacent reinforcing ribs 2 is 1 / 8 to 1 / 6 of the circumference of the pipe body 1, preferably 1 / 6. The multi-rib configuration enhances the cross-sectional deformation resistance, and the scientific spacing layout ensures a balance between strength and material economy. The pitch of the spiral guide pattern 3 is 30 to 50 mm, preferably 40 mm. The cross-section of the spiral guide pattern 3 is semi-elliptical, with a height of 0.8 to 1.2 mm, preferably 1 mm. The specific pitch design improves the stability of water flow and optimizes the cross-sectional shape to reduce sediment adhesion.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A D-shaped tube, characterized in that: The tube includes a D-shaped cross-section, comprising an arc-shaped portion, a rectangular portion, and a connecting portion connecting the arc-shaped portion and the rectangular portion. The arc-shaped portion, the rectangular portion, and the connecting portion are integrally formed. The arc-shaped portion has an arc surface with a semi-circular cross-section. The rectangular portion has three flat surfaces with a U-shaped cross-section. The connecting portion has two inclined surfaces. The sidewall thickness of the flat surfaces is 1.2 to 1.5 times that of the sidewall thickness of the arc surfaces. The inner wall of the flat surfaces is provided with reinforcing ribs distributed along the axial direction of the tube. The inner wall of the arc surfaces is provided with at least two spiral guide lines.

2. The D-shaped tube according to claim 1, characterized in that: The tube body includes an inner layer, an outer layer, and a metal layer distributed between the inner and outer layers. The metal layer has through holes distributed in a matrix, and the inner and outer layers are connected at the through holes.

3. The D-shaped tube according to claim 2, characterized in that: The inner layer, located on the rectangular portion, has rectangular through grooves that extend along the axial direction of the tube.

4. The D-shaped tube according to any one of claims 1 to 3, characterized in that: A rounded corner structure is provided between adjacent inclined surfaces and straight surfaces, and the transition arc radius of the rounded corner structure is not less than 3mm.

5. The D-shaped tube according to claim 4, characterized in that: The inclined surface of the connecting part forms an angle of 65 to 85 degrees with the horizontal plane, and the length of the inclined surface accounts for 1 / 10 to 1 / 8 of the height of the pipe body.

6. The D-shaped tube according to claim 1, characterized in that: The number of reinforcing ribs is 3 to 5, the rib height is 1.5 to 2.5 mm, the rib width is 4 to 6 mm, and the distance between adjacent reinforcing ribs is 1 / 8 to 1 / 6 of the circumference of the tube.

7. The D-shaped tube according to claim 1, characterized in that: The spiral guide pattern has a pitch of 30-50 mm, a semi-elliptical cross-section, and a height of 0.8-1.2 mm.

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