CN204879110U - Heavy -calibre stainless steel steel pipe fitting - Google Patents

Abstract

The utility model discloses a large-diameter stainless steel pipe fitting. The base body of the stainless steel pipe fitting is provided with a sealing ring groove and a groove for enhancing the axial strength of the plastic at the pipe end. A wave-shaped sealing ring is arranged in the sealing ring groove, and a polyethylene plastic layer is arranged outside the sealing ring. The end of the pipe is wrapped with polyethylene plastic, one is to compact the sealing ring for sealing, and the other is to match the large-diameter steel-plastic composite pipeline project, and the existing electric melting belt is used for connection. A sealing ring with a certain width and thickness increases the contact area of the sealing surface on the one hand, and on the other hand ensures the compression of the sealing ring to achieve a better sealing effect. The groove at the pipe end on the pipe fitting base body can be used to enhance the axial strength of the plastic at the pipe end, and the utility model can effectively guarantee the strength and pressure bearing capacity of the pipe fitting.

Description

A large diameter stainless steel pipe fitting

technical field

The utility model relates to a novel large-diameter stainless steel pipe fitting.

Background technique

Steel pipe fittings based on known technologies generally include steel pipe elbows, variable diameters and tees, etc., which are mainly used for steel pipes, and the connection forms are mostly welded or flanged. When steel pipe fittings are used for plastic pipes, flange connection is generally used, which requires special pure plastic or steel-plastic flanges with skeletons to be used for connection with steel pipe fittings, which increases costs. When plastic pipes are used When the flange connection is sealed, because the thermal expansion and contraction of the pipe body is greatly affected by the change of the ambient temperature and the temperature of the medium, the flange seal is not reliable when applied to the plastic pipe connection. As time goes by, the probability of flange seal leakage It will increase, which will bring hidden dangers to the safety of pipeline use.

Utility model content

The technical problem to be solved by the utility model is to provide a large-diameter stainless steel pipe fitting with simple structure, convenient connection, good connection sealing performance, which can effectively guarantee the strength and pressure bearing capacity of the pipe fitting, which is used in large-diameter steel-plastic composite pipeline projects matching.

In order to achieve the above technical problems, the technical solution provided by the utility model is: a large-diameter stainless steel pipe fitting, the key technology of which is: it includes a steel pipe fitting base and a polyethylene plastic sheet arranged outside the end of the steel pipe base. The polyethylene plastic layer formed by winding, the pipe end of the steel pipe fitting base is provided with at least two rows of sealing ring grooves and two grooves for enhancing the axial strength of the polyethylene plastic layer, and the sealing ring groove is provided with In the wave-shaped sealing ring, the polyethylene plastic layer is partially embedded in the groove under pressure.

Both the sealing ring and the groove are covered in the polyethylene plastic layer.

The beneficial effects produced by adopting the above technical scheme are: the utility model uses stainless steel pipe fittings as the pipe fitting base, and is provided with a sealing ring, a polyethylene plastic layer and a groove for bearing axial strength at the pipe end, which can effectively protect The strength and pressure bearing capacity of the pipe fittings protect the pipe fittings from corrosion. Compared with the steel vertical ribs that are difficult to weld, the grooves on the steel parts are used here to avoid the welding slag generated by the vertical ribs during the welding process from polluting the steel. The surface of the part can effectively reduce the deformation of the ellipticity of the steel part caused by the vertical rib during the welding process. Among them, a wave-shaped sealing ring is placed at the end of the pipe and wrapped with polyethylene plastic, which can effectively seal the pipe fitting port. Compared with a single O-shaped sealing ring, the wave-shaped sealing ring increases the contact between the sealing ring and the steel parts. The area is beneficial to the sealing effect, and the pressure-holding test results can also explain this problem; when it is matched with a large-diameter steel-plastic composite pipeline project, the existing electric melting belt can be used for connection, which is convenient, reliable and low-cost.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Among them, 1. pipe fitting substrate, 2. polyethylene plastic layer, 3. wave-shaped sealing ring, 4. groove.

Detailed ways

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work.

Referring to accompanying drawing 1, this large-diameter stainless steel pipe fitting uses welded or seamless steel pipe fittings as the pipe fitting base 1 to ensure the pressure bearing capacity of the pipe fittings. The pipe end of the pipe fitting base 1 is sealed with a wave-shaped sealing ring 3 with a certain width and thickness and a polyethylene plastic layer 2 . Place the wave-shaped sealing ring 3 in the sealing groove opened in the pipe of the pipe fitting base 1, wind the polyethylene sheet at the end of the pipe to form a polyethylene plastic layer 2, and use the shrinkage characteristics of polyethylene plastic to realize the sealing of the wave-shaped sealing ring 3 Compact and seal. The pipe end of the pipe fitting base 1 is provided with grooves 4 with a certain depth and width, which are used to enhance the axial strength of the plastic at the pipe end. The number of grooves 4 and their depth and width should be determined according to the actual situation. The steel pipe fittings will be used in large-diameter steel-plastic composite pipeline projects, and the existing electric melting belts will be used for connection. The width of the polyethylene plastic at the pipe end shall meet the welding requirements of the electric heating belt.

During use, the surface of the polyethylene plastic layer 2 needs to be polished to remove scale, and an electric heating belt is used to connect the steel-plastic composite pipe. This large-diameter steel pipe fitting can be used for supporting large-diameter steel-plastic composite pipe engineering, and can well meet the requirements of pressure, anti-corrosion, sealing and connection. The problem of connection and sealing between the above-mentioned steel pipe fittings and plastic pipes is solved.

The pipe fitting base 1 of the utility model is wrapped with polyethylene plastic at the end of the pipe, one is to seal the sealing ring, and the other is to connect with the large-caliber steel-plastic composite pipeline project by using the existing electric melting belt. The wave-shaped sealing ring with a certain width and thickness increases the contact area of the sealing surface on the one hand, and on the other hand ensures the compression of the wave-shaped sealing ring to achieve a better sealing effect. The groove at the pipe end on the pipe fitting base body can be used to enhance the axial strength of the plastic at the pipe end, and the utility model can effectively guarantee the strength and pressure bearing capacity of the pipe fitting.

Parts not described in detail in the utility model belong to the common knowledge of those skilled in the art. The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (2)

1. a large-caliber stainless steel steel pipe fittings, it is characterized in that: it polyvinyl plastics layer (2) be wound by polyvinyl plastics sheet comprising steel pipe fittings matrix (1) and be located at steel pipe fittings matrix (1) pipe end outside, the pipe end of described steel pipe fittings matrix (1) is provided with at least two row's closure gasket groove and two grooves for enhanced polyethylene plastic layer axial strength (4), be provided with wave-like type seal ring (3) in described closure gasket groove, described polyvinyl plastics layer (2) under stress part embeds in groove.

2. large-caliber stainless steel steel pipe fittings according to claim 1, is characterized in that: described seal ring (3) and groove are all coated in polyvinyl plastics layer (2).