CN204164569U - A kind of composite steel-plastic pipe fitting not needing secondary sealing - Google Patents

Abstract

The utility model discloses a steel-plastic composite pipe fitting without secondary sealing, which comprises a general pipe body (1), and the general pipe body is a tee, a cross, an elbow and a different-diameter pipe fitting. Contains a steel skeleton (4) welded by thin steel plates uniformly punched and coiled. The general pipe body has multiple pipe ends, and each pipe end is integrally provided with an electrofusion connection structure (2) or/and Flange connection structure (3), the electrofusion connection structure and the flange connection structure are all equipped with a steel skeleton, the electrofusion connection structure, the flange connection structure and the general pipe fittings communicate with each other, and the length of the electrofusion connection structure and the flange connection structure is different. Less than half of the length of the end of the general fitting. Steel-plastic composite pipe fittings do not require secondary sealing, and the connection structure at the end of the matching pipe fittings can be flexibly changed according to the requirements of the construction site for the connection form of the pipeline, so that the construction progress can be accelerated, the pipeline construction efficiency can be improved, the production cost can be reduced, and the product quality can be ensured. Eliminate potential safety hazards in pipeline operation.

Description

A steel-plastic composite pipe fitting without secondary sealing

technical field

The utility model relates to a steel-plastic composite pipe fitting used for connecting steel-plastic composite pipes.

Background technique

In the auxiliary installation of steel-plastic composite pipelines, steel-plastic composite pipe fittings such as tees and elbows for pipeline connection are often used. Due to different construction conditions, in order to meet different construction requirements, the existing tee used for steel-plastic composite pipelines Steel-plastic composite pipe fittings such as elbows and elbows are generally prefabricated into universal semi-finished pipe fittings, and then according to the different requirements of the construction site, the connection ends of the semi-finished pipe fittings are sealed by secondary injection molding to make full-fusion end connection forms or full-flange ends. Connection forms and various sealing combinations of electrofusion and flange hybrid connections. This form of steel-plastic composite pipe fittings can complete the predetermined connection combination in the factory according to the requirements of the site, so as to adapt to different pipeline connection requirements. However, there are the following problems in the production of finished steel-plastic composite pipe fittings in this way; first, it is necessary to pre-seal the required steel-plastic composite pipe fittings in the factory according to the installation requirements of the pipeline at the construction site, which will inevitably affect the construction progress of the construction site , reduce construction efficiency. Second, because this kind of steel-plastic composite pipe fittings is a custom-made form, it is impossible to flexibly change the connection form of pipe fittings on the construction site according to the requirements of the construction site, so it is necessary to increase the inventory to ensure the construction progress, which indirectly increases the pipeline quality. The initial investment, and in order to meet the connection needs of the construction site, the semi-finished steel-plastic composite pipe fittings had to be sealed by secondary injection molding. Due to the increase in processing steps, the steel-plastic composite pipe fittings had quality problems at the seal. The probability increases, but the product quality is lowered, and the safety hazard during pipeline operation is increased.

Utility model content

Aiming at the problems existing in the above-mentioned prior art, the utility model provides a method that can flexibly change the sealing form of the connecting end of the pipe fittings at the construction site according to the requirements of the connection form of the construction pipeline to the pipe fittings, and does not need to carry out the sealing of the connecting ends of the pipe fittings. Steel-plastic composite pipe fittings with secondary sealing. This steel-plastic composite pipe fitting not only improves construction efficiency, reduces the inventory quantity of steel-plastic composite pipe fittings at the construction site, but also eliminates potential safety hazards caused by increasing the product sealing process.

The technical solution adopted for the technical problem to be solved by the utility model is: the steel-plastic composite pipe fitting without secondary sealing includes a general pipe body, and the general pipe body is a three-way, four-way, elbow or different-diameter pipe fitting , the general-purpose pipe body includes a steel skeleton welded by uniform punching and rolling of thin steel plates, and the pipe end of the general-purpose pipe body is integrally provided with an electrofusion connection structure or/and a flange connection structure through electroforming, so Both the electrofusion connection structure and the flange connection structure are provided with a steel skeleton, the electrofusion connection structure, the flange connection structure and the general pipe fittings communicate with each other, and the length of the electrofusion connection structure and the flange connection structure are longer than the general pipe fittings One-half the length of a pipe end.

The pipe end connection form of the general pipe body is a full flange connection form injected together with the general pipe body, and the first half of the pipe fitting end structure in the full flange connection form is in line with the current domestic steel-plastic composite pipe industry. In the flange sealing method one, the outer diameter of the second half of the pipe fitting end structure matches the inner diameter of the electric fusion sleeve pipe fittings in the current steel-plastic composite pipe industry, and the pipe fitting end structure of the full flange connection form The total length is equal to half the length of the matching electrofusion sleeve pipe.

Since the utility model has to wait for the connection form of the original steel-plastic composite pipe fittings to be determined before the corresponding sealing method can be carried out on the pre-produced semi-finished steel-plastic composite pipe fittings according to the requirements, the utility model adopts the method regardless of the construction site. The connection requirements of the plastic composite pipe fittings are in that form, and each end of the steel-plastic composite pipe fittings adopts a full flange connection formed by injection molding together with the pipe fittings. Since the second half of this structural form adopts the current electrofusion connection form in the steel-plastic composite pipe industry, it can be flexibly matched at the construction site according to the needs of the pipeline connection form, that is, if the construction site requires the ports of the pipe fittings to be The flange connection form can be directly connected with the steel-plastic composite pipe fittings of the present utility model. The size of the electrofusion connection structure with the second half is sufficient.

Since the steel-plastic composite pipe fitting of the utility model does not require secondary sealing, and the connection structure form of the end of the matching pipe fitting can be flexibly changed according to the requirements of the construction site for the pipeline connection form, the construction progress can be accelerated, the pipeline construction efficiency can be improved, and the production cost can be reduced. The cost is guaranteed, the product quality is ensured, and the safety hazard of pipeline operation is eliminated.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model when the connecting ends of the three-way pipe fittings are in the form of flanges and electrofusion connections.

Fig. 2 is a structural schematic diagram of the utility model when the connection end of the three-way pipe fitting is in the form of an electrofusion connection structure.

In the figure, 1. Universal pipe body 2. Electrofusion connection structure 3. Flange connection structure 4. Steel skeleton.

Detailed ways

In Fig. 1, the steel-plastic composite pipe fitting without secondary sealing includes a general pipe body 1 as a three-way pipe fitting (also a four-way pipe, an elbow or a different-diameter pipe fitting, etc.), and the general pipe body includes a The steel skeleton 4 is formed by uniform punching and coil welding of thin steel plates and galvanized treatment. The general-purpose pipe body has three pipe ends, and an electrofusion connection structure 2 and a method are integrally provided on each pipe end through electroforming. Blue connection structure 3, the electrofusion connection structure and the flange connection structure are all provided with a steel skeleton, the electrofusion connection structure, the flange connection structure and the general pipe fittings communicate with each other, the length of the electrofusion connection structure and the flange connection structure Both are greater than half of the length of a pipe end of a general pipe fitting. In Fig. 2, the universal pipe body has three pipe ends, two horizontal pipe ends are integrally provided with an electrofusion connection structure 2 by electroforming, and one vertical pipe end is integrally provided with an electrofusion connection by electroforming Structure 2 and flange connection structure 3. The utility model adopts the method of one-time forming with the end sealing structure of the pipe fittings during the production of the steel-plastic composite pipe fittings to form an integral steel-plastic composite pipe fitting. The pipe fitting can flexibly change the connection structure form of the end of the pipe fitting according to the requirements of the connection form on the construction site, and is matched with the connected pipeline. Its specific implementation method is that the steel skeleton 4 of the steel-plastic composite pipe fitting is put into the mold cavity, and the universal pipe body 1 is produced after mold heating, injection, pressure keeping, cooling and other processes. Figure 1 shows that the first half of the three pipe ends of the general pipe body 1 are in the form of flange connection structure 3 and the second half of the pipe ends are in the form of electric fusion connection structure 2 (electrofusion sleeve), and the pipe ends are electrically connected The outer diameter size of the fusion connection structure matches the inner diameter of the electrofusion connection piece to which it is connected. Therefore, if all pipe ends need to be connected with flanges at the construction site, the steel-plastic composite pipe fitting according to Embodiment 1 of the present utility model can be directly put into use. When the construction site requires the connection structure of all steel-plastic composite pipe fittings to be an electrofusion connection structure, it is only necessary to turn the outer diameter of the flange connection structure 3 (flange sleeve) of each pipe end to the end of the pipe end electrofusion connection structure 2. The outer diameter size is enough; if the vertical pipe end of the pipe fittings on site requires a flange connection structure, and the horizontal pipe end uses a mixed form of electrofusion connection structure, the pipe fittings in Figure 2 can be used. Fig. 2 shows that the first half of the two horizontal pipe ends in the general pipe body 1 are in the form of electrofusion connection structure 2, and the connection structure of a vertical pipe end is a combination of electrofusion connection structure and flange connection structure 3.

Claims (1)

1. A steel-plastic composite pipe fitting that does not require secondary sealing, it includes a general pipe body (1), and the general pipe body is a three-way, four-way, elbow or different-diameter pipe fitting, and the general pipe body contains There is a steel skeleton (4) welded by uniform punching and coiling of thin steel plates, and its feature is: the end of the general pipe body is provided with an electrofusion connection structure (2) or/and flange connection through electroforming Structure (3), the electrofusion connection structure and the flange connection structure are all provided with a steel skeleton, the electrofusion connection structure, the flange connection structure and the general pipe fittings communicate with each other, the electrofusion connection structure, the flange connection structure The structural length is greater than one-half of the length of a pipe end of a general pipe fitting.