CN220647053U

CN220647053U - Nodular cast iron pipe

Info

Publication number: CN220647053U
Application number: CN202322056255.7U
Authority: CN
Inventors: 王观周
Original assignee: Rizhao Zhufu Industry Co ltd
Current assignee: Rizhao Zhufu Industry Co ltd
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2024-03-22
Anticipated expiration: 2033-08-01

Abstract

The utility model provides a spheroidal graphite cast iron pipe, which relates to the technical field of pipelines and comprises a spheroidal graphite cast iron pipe body, wherein a built-in iron pipe is connected inside the spheroidal graphite cast iron pipe body, and a nickel layer is uniformly arranged on the inner wall of the built-in iron pipe; the device makes the spheroidal graphite cast iron pipe body isolated from the internal environment by arranging the built-in iron pipe inside the spheroidal graphite cast iron pipe body, thereby achieving the purpose of impact resistance, bearing larger impact load, improving the protection effect of the spheroidal graphite cast iron pipe body, and arranging the nickel layer on the inner wall of the built-in iron pipe, so that an extremely thin passivation film is formed inside the built-in iron pipe, improving the corrosion resistance of the built-in iron pipe and having high use effect.

Description

Nodular cast iron pipe

Technical Field

The utility model relates to the technical field of pipelines, in particular to a ductile cast iron pipe.

Background

The spheroidal graphite cast iron pipe is a pipe which is cast by casting molten iron with more than 18 numbers through a centrifugal spheroidal graphite cast iron machine at high speed after adding a nodulizer, and is called a spheroidal graphite cast pipe, a spheroidal graphite cast iron pipe and the like for short. The material is mainly used for conveying tap water and is an ideal material for selecting tap water pipelines.

Chinese patent CN205908886U proposes a spheroidal graphite cast iron pipe, chinese patent CN202165705U proposes a spheroidal graphite cast iron pipe; the two spheroidal graphite cast iron pipes are coated, so that the protection effect on the spheroidal graphite cast iron pipes is improved, and the spheroidal graphite cast iron pipes have stronger corrosion resistance; however, in the concrete implementation process, the ductile cast iron pipe is contacted with water, so that the produced water flow impact is large, shrinkage holes and cracks are easy to generate, and the ductile cast iron pipe cannot bear large impact load.

Disclosure of Invention

The utility model aims to solve the problems in the background art, and further provides a spheroidal graphite cast iron pipe.

The technical scheme adopted for solving the technical problems is as follows:

the ductile cast iron pipe comprises a ductile cast iron pipe body, wherein a built-in iron pipe used for bearing a large impact load is connected inside the ductile cast iron pipe body, and a nickel layer is uniformly arranged on the inner wall of the built-in iron pipe so as to form an extremely thin passivation film inside the built-in iron pipe.

Further, the thickness of the nickel layer is 0.1-0.5 mm.

Furthermore, no gap exists between the outer wall of the built-in iron pipe and the inner wall of the nodular cast iron pipe body so as to improve the two ends and the tightness.

Furthermore, the outer surface of the spheroidal graphite cast iron pipe body is sequentially provided with a zinc layer and an asphalt layer from inside to outside so as to enable the spheroidal graphite cast iron pipe body to form a composite protection system outside, and further the protection effect on the spheroidal graphite cast iron pipe body is improved.

Further, the total thickness of the zinc layer and the asphalt layer is not less than 5mm.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the built-in iron pipe is arranged in the spheroidal graphite cast iron pipe body, so that the spheroidal graphite cast iron pipe body is isolated from the internal environment, the purpose of impact resistance is achieved, a larger impact load can be borne, the protection effect of the spheroidal graphite cast iron pipe body is improved, and the nickel layer is arranged on the inner wall of the built-in iron pipe, so that an extremely thin passivation film is formed in the built-in iron pipe, and the corrosion resistance of the built-in iron pipe is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1A;

wherein: 1. a spheroidal graphite cast iron pipe body; 2. an iron pipe is arranged in the steel pipe; 3. a zinc layer; 4. an asphalt layer; 5. and a nickel layer.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. The utility model will be further described with reference to the accompanying drawings and examples:

as shown in fig. 1 and 2, the ductile cast iron pipe comprises a ductile cast iron pipe body 11, wherein an internal iron pipe 22 is connected inside the ductile cast iron pipe body 11, and the internal iron pipe 22 isolates the ductile cast iron pipe body 11 from the internal environment, so that the purpose of impact resistance is achieved, and a large impact load is born; the inner wall of the built-in iron pipe 22 is uniformly provided with a nickel layer 55 to form an extremely thin passivation film inside the built-in iron pipe 22, so that the built-in iron pipe 22 is isolated from air, and thus the corrosion of the atmosphere, alkali and certain acids can be resisted, and the thickness of the nickel layer 55 is 0.1-0.5 mm.

Wherein, no gap exists between the outer wall of the built-in iron pipe 22 and the inner wall of the nodular cast iron pipe body 11 so as to improve the two purposes and the tightness.

The outer surface of the spheroidal graphite cast iron pipe body 11 is sequentially provided with a zinc layer 3 and an asphalt layer 44 from inside to outside so as to form a composite protection system outside the spheroidal graphite cast iron pipe, a thermal spraying method is adopted in the process of spraying the zinc layer 3, namely a low-voltage high-current power supply is adopted in the process of spraying, zinc wires are heated to a molten state, then zinc in the molten state is sprayed into a atomized state by means of compressed air, and the molten state is sprayed to the outer surface of the spheroidal graphite cast iron pipe body 11 in a state of tiny zinc drops; so that in the process of contacting with the external environment, the zinc layer 3 and carbonate and other substances in the soil are combined into an insoluble zinc carbonate protective film, the protective film is tightly adhered to the wall of the nodular cast iron pipe body 11 to form a compact continuous insoluble and impermeable coating, and the asphalt layer 44 coated on the zinc layer 3 can promote the zinc layer 3 to be converted into stable and insoluble zinc salt; and in the process of transporting or installing the ductile cast iron pipe, local damage can occur, the zinc layer 3 is quickly transformed into zinc ions under the action of the primary battery, and the zinc ions migrate through the action of the asphalt layer 44 for sealing pores and cover the damage, so that a stable and insoluble protective zinc layer 3 is formed; in this embodiment, the total thickness of the zinc layer 3 and the asphalt layer 44 is not less than 5mm.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing examples, and that the foregoing description and description are merely illustrative of the principles of this utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a nodular cast iron pipe, includes nodular cast iron body (1), its characterized in that, nodular cast iron body (1) internal connection has built-in iron pipe (2), and the inner wall of built-in iron pipe (2) evenly is equipped with nickel layer (5).

2. A ductile iron pipe according to claim 1, characterized in that the nickel layer (5) has a thickness of 0.1-0.5 mm.

3. A ductile iron pipe according to claim 1 characterized in that there is no gap between the outer wall of the built-in iron pipe (2) and the inner wall of the ductile iron pipe body (1).

4. The ductile iron pipe according to claim 1, characterized in that the outer surface of the ductile iron pipe body (1) is provided with a zinc layer (3) and an asphalt layer (4) from inside to outside.

5. A ductile iron pipe according to claim 4 characterized in that the total thickness of the zinc layer (3) and the bitumen layer (4) is not less than 5mm.