CN201110430Y

CN201110430Y - Pipe connection flange

Info

Publication number: CN201110430Y
Application number: CNU2007200767288U
Authority: CN
Inventors: 张宝铭; 顾卫东; 刘勇; 丁致瑜
Original assignee: Shanghai Water Construction & Engineering Co Ltd
Current assignee: Shanghai Water Construction & Engineering Co Ltd
Priority date: 2007-10-29
Filing date: 2007-10-29
Publication date: 2008-09-03
Anticipated expiration: 2017-10-29

Abstract

The utility model provides a pipe connection flange which comprises a plastic pipe end flange and a cast iron pipe end flange, wherein the plastic pipe end flange is the same as the known plastic pipe end flange structure which is applied in the 'three pieces of flanges' connection method, the cast iron end flange takes a plane disc shape whose inner hole shape is divided into two segments, one segment which is jointed with the cast iron pipe is a straight hole whose diameter is the same as the outer diameter of the cast iron pipe, the other segment is a conical hole whose large end diameter is the same as the inner diameter of the cast iron pipe, and the small end diameter of the conical hole is the same as the plastic pipe joint. The pipe connection flange has the advantages of saving a transition flange, simple structure, convenient assembly, few seal steps and low leakage probability.

Description

A kind of pipeline adpting flange

Technical field

The utility model relates to the water feeding penstock construction technology, is specifically related to a kind of pipeline adpting flange.

Background technique:

The PE plastic tube since the extensive use, often need be connected plastic tube in the pipeline construction in tap water comb engineering with cast iron tube.Ordinary circumstance, the inwall smoother of plastic tube, damping constant is less, and the cast iron tube inwall is more coarse, damping constant is relatively large, therefore under the prerequisite of equal flow, the design bore of unlike material pipeline is different, and promptly the design bore of plastic pipe is less than the design bore of cast-iron pipe.Owing to above reason, in tap water comb engineering, often the water pipe of two kinds of unlike materials, different tube diameters need be connected.The present method that the water pipe of two kinds of unlike materials, different tube diameters is connected is known being commonly called as " three a flanges " method, its structural feature is as shown in Figure 1: in joint for plastic tube 6 one sides a slice is set and moulds pipe end flange 1, in cast iron tube 4 one sides a slice cast iron tube end flange 3 is set, between joint for plastic tube 6 and flange 3, a slice counter flange 2 is set again, liner seal ring 5 between the flange junction plane, connect three flanges with screw and nut, thereby two pipelines are connected.The reason that counter flange 2 wherein is set is: because the plastic tube caliber is less than cast iron tube 4 calibers, the inside and outside footpath of joint for plastic tube 6 end faces is corresponding less, if no counter flange 2, then the surface of contact between joint for plastic tube 6 end faces and the flange is too little, be unfavorable for the setting of seal ring, therefore in order to increase the area of contact between joint for plastic tube 6 end faces and the flange, satisfy the needs that seal ring 5 is provided with, counter flange 2 must be set.

As seen, known at present " three flanges " connecting means, structure more complicated.

The model utility content

The purpose of this utility model provides a kind of pipeline adpting flange, so that the structure that the water pipe of unlike material, different tube diameters is connected is simplified relatively.

The technical solution of the utility model is as follows:

A kind of pipeline adpting flange is by moulding pipe end flange 1 and cast iron tube end flange 7 is formed, mould use in pipe end flange 1 and known " three flanges " connecting means to mould the pipe end flange structure identical, it is characterized in that: described cast iron tube end flange 7 is the flat circle plate-like, hole shape is divided into two sections in it, be connected the Duan Weiyi diameter straight hole identical mutually with cast iron tube 4 with cast iron tube 4 external diameters, another section is a conical bore, the Outside diameter of conical bore is identical with cast iron tube 4 internal diameters, and the end diameter of conical bore is identical with joint for plastic tube 6 internal diameters; The circumferential edges of cast iron tube end flange 7 is provided with the through hole of some mounting screws.

Benefit of the present utility model is: need not to use counter flange, simplify the structure, it is convenient relatively to install; Reduced sealing part simultaneously, leakage probability reduces.

Description of drawings:

Fig. 1 is the principle schematic that known " three flanges " method connects;

Fig. 2 is the utility model structure and use principle schematic representation.

Embodiment

Below in conjunction with drawings and Examples the utility model is described further.

As shown in Figure 2, the utility model is formed by moulding 7 two flanges of pipe end flange 1 and cast iron tube end flange; Be arranged in the flange that pipe end flange 1 is continued to use known " three flanges " connecting means of moulding of joint for plastic tube 6 one ends; The interior hole shape of described cast iron tube end flange 7 is divided into two sections, being connected section mutually with cast iron tube 4 is straight hole, the diameter of straight hole is identical with cast iron tube 4 external diameters, be enclosed within during installation on the cylindrical of cast iron tube 4, and welding mutually, another section is a conical bore, the Outside diameter of conical bore is identical with cast iron tube 4 diameters, the small end of conical bore is connected mutually with joint for plastic tube 6, and the end diameter of conical bore is identical with joint for plastic tube 6 internal diameters; Be provided with seal ring 5 between the end face of cast iron tube end flange 7 and joint for plastic tube 6; The hole that the circumferential edges of cast iron tube end flange 7 was provided with and moulded pipe end flange 1 corresponding mounting screw leads to, and two flanges connect with screw and nut.

The endoporus of described cast iron tube end flange 7 is designed to coniform hole with the end that joint for plastic tube 6 is connected mutually, helps reducing the impact resistance of water.

Obviously, owing to saved counter flange in known " three flanges " connecting means, the structure that makes the water pipe of two kinds of unlike materials, different tube diameters be connected obtains simplifying, and it is convenient relatively to install; Because sealing surface reduces, therefore reduced leakage probability simultaneously.

Claims

1. pipeline adpting flange, by moulding pipe end flange (1) and cast iron tube end flange (7) is formed, it is characterized in that: described cast iron tube end flange (7) is the flat circle plate-like, hole shape is divided into two sections in it, be connected Duan Weiyi diameter and the identical straight hole of cast iron tube (4) external diameter mutually with cast iron tube (4), another section is a conical bore, the Outside diameter of conical bore is identical with cast iron tube (4) internal diameter, the end diameter of conical bore is identical with joint for plastic tube (6) internal diameter, and the hole that the circumferential edges of cast iron tube end flange (7) was provided with and moulded the corresponding mounting screw of pipe end flange (1) leads to.