A new type of corrugated pipe structure of corrosion-resistant material

Abstract

The utility model discloses a novel corrugated pipe structure of corrosion -resistant material, including pipe body and corrugated section, the corrugated section evenly distributes and is located on the pipe body, the corrugated section includes wave trough, wave crest and peak valley connecting section, wave trough recess is located in the pipe body setting, wave crest protrudes and is located in the pipe body setting, the peak valley connecting section is located between wave trough and wave crest, the pipe body and corrugated section are placed when installing, the tangent of wave crest and wave trough forms angle, the angle is less than the placement angle of pipe body and corrugated section with pipe center axis as reference, through the adjustment to the corrugated shape, effectively reduce the condensation of condensate in the corrugated place and store, reduce the concentration of halogen element, to realize the flow of condensate, prevent condensate from condensing and storing at the corrugated place, avoid the problem of point corrosion failure at the corrugated place.

Description

Technical Field

[0001] This utility model belongs to the field of corrugated pipe technology, and specifically relates to a new type of corrugated pipe structure made of corrosion-resistant material. Background Technology

[0002] Exhaust bellows are typically installed between the engine's EGR cooler and the EGR valve, or between the valve and the intake manifold. Their main functions are to transport exhaust gases, absorb mechanical vibrations, and compensate for installation misalignments. During use, due to the bellows' inherent structure (wavy shape with varying elevations), condensation easily forms at the corrugations under high and low temperature conditions. Furthermore, the use of oils or additives introduces halogen elements (primarily Cl and S) into the exhaust gases. These halogen levels increase with the presence of condensation, and once a certain concentration is reached, pitting corrosion occurs at the corrugations, thus reducing their lifespan.

[0003] Traditional exhaust bellows are usually designed to be placed at an angle to the engine to prevent condensation and storage of water through gravity. However, in actual use, due to the characteristics of the bellows (wavy shape), the lowest point is always formed at the corrugations, which creates the conditions for condensation and storage of water.

[0004] The commonly used material for vent bellows is 304 stainless steel. The corrosion resistance of this material relies on the formation of a dense chromium oxide passivation film on the metal surface, which isolates the metal from the corrosive medium. Halogen (Cl) ions, with their small ionic radius and strong penetrating power, easily adsorb at defects on the passivation film surface. Furthermore, Cl preferentially adsorbs onto the metal surface, replacing oxygen in the oxide and transforming the passivation film into easily soluble metal oxides, thus completely destroying the passivation film. With the continuous accumulation of Cl, pitting corrosion extends deeper until it penetrates the metal wall, leading to pitting corrosion failure. Therefore, a novel corrugated pipe structure made of corrosion-resistant material is proposed. Utility Model Content

[0005] The purpose of this invention is to overcome the problem in existing technologies where condensate accumulates at the corrugated parts of the corrugated pipe, causing pitting corrosion that can eventually penetrate the metal wall and lead to pitting corrosion failure. This invention provides a novel corrugated pipe structure made of corrosion-resistant material, which ensures that the lowest point of the product is not located at the corrugated part by adjusting the placement angle of the corrugated pipe. This prevents condensate from condensing and accumulating at the lowest point of the corrugations.

[0006] To achieve the above objectives, this utility model provides a novel corrugated pipe structure made of corrosion-resistant material, comprising a pipe body and corrugated sections. The corrugated sections are evenly distributed on the pipe body, and each corrugated section includes troughs, crests, and peak-trough connecting sections. The troughs are recessed within the pipe body, the crests are protruding within the pipe body, and the peak-trough connecting sections are located between the troughs and crests. The pipe body and corrugated sections are installed at an angle, and the angle formed at the tangent points of the crests and troughs is smaller than the placement angle of the pipe body and corrugated sections, with the central axis of the pipe as a reference.

[0007] Preferably, the pipe body and corrugated section are made of 904L, 2205, 444 or 625 material, and the use of corrosion-resistant material to make the corrugated pipe improves the corrosion resistance of the corrugated pipe itself.

[0008] Preferably, the peak-valley connecting segments, peaks, and troughs are arranged alternately.

[0009] The beneficial effects of this utility model are:

[0010] This invention uses highly corrosion-resistant materials such as 904L, 2205, 444, or 625 to improve the corrosion resistance of the corrugated pipe while ensuring its flexibility and rigidity.

[0011] In addition, by adjusting the shape of the corrugations, the condensation and storage of condensate at the corrugations can be effectively reduced, the concentration of halogen elements can be lowered, the flow of condensate can be achieved, the condensation and storage of condensate at the corrugations can be prevented, and the pitting corrosion failure at the corrugations can be avoided. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the corrugated pipe structure made of corrosion-resistant material according to this utility model.

[0013] Figure 2 This is a diagram showing the placement of a corrugated pipe structure made of corrosion-resistant material, as described in this utility model.

[0014] Figure 3 This utility model is a structural diagram of the corrugated section of a corrugated pipe structure made of corrosion-resistant material.

[0015] In the diagram: 1. Pipe body; 2. Corrugated section; 3. Valley; 4. Crest; 5. Peak-valley connection section. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1-3The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, specific orientation structure, or operation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figure 1 , 2 and Figure 3 As shown, this embodiment provides a novel corrugated pipe structure made of corrosion-resistant material, including a pipe body 1 and corrugated sections 2. The corrugated sections 2 are evenly distributed on the pipe body 1. Each corrugated section 2 includes troughs 3, crests 4, and peak-trough connecting sections 5. The peak-trough connecting sections 5, crests 4, and troughs 3 are arranged alternately. The troughs 3 are recessed within the pipe body 1, and the crests 4 are protruding within the pipe body 1. The peak-trough connecting sections 5 are located between the troughs 3 and crests 4. The pipe body 1 and the corrugated sections 2 are installed at an angle (as shown below). Figure 2 (The angle is 68.6°), forming a certain angle at the tangent point between wave crest 4 and wave trough 3. This formed angle (such as...) Figure 3 The angle is 64.5°, with the central axis of the pipeline as the reference, and should be smaller than the placement angle of the pipeline (as follows). Figure 2 (Angle 68.6°).

[0019] Specifically, the tube body 1 and the corrugated section 2 are made of 904L, 2205, 444 or 625 material.

[0020] In this embodiment, the corrugated pipe is tilted so that the tangent points of the crests 4 and troughs 3 form a certain angle. This angle is based on the central axis of the pipe and is smaller than the placement angle of the pipe.

Claims

1. A novel corrugated pipe structure made of corrosion-resistant material, comprising a pipe body (1) and corrugated sections (2), wherein the corrugated sections (2) are evenly distributed on the pipe body (1), and the corrugated sections (2) include troughs (3), peaks (4) and peak-trough connection sections (5), wherein the troughs (3) are recessed and disposed on the pipe body (1), the peaks (4) are protruding and disposed on the pipe body (1), and the peak-trough connection sections (5) are disposed between the troughs (3) and the peaks (4). The pipe body (1) and the corrugated sections (2) are installed at an angle, wherein the tangent between the peaks (4) and the troughs (3) forms an angle, wherein the angle is based on the central axis of the pipe and is less than the placement angle of the pipe body (1) and the corrugated sections (2).

2. The novel corrosion-resistant corrugated pipe structure according to claim 1, characterized in that, The tube body (1) and the corrugated section (2) are made of 904L, 2205, 444 or 625 material.

3. The novel corrosion-resistant corrugated pipe structure according to claim 1, characterized in that, The peak-valley connecting section (5), peak (4) and valley (3) are arranged alternately.

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