CN2639657Y

CN2639657Y - Reducing pipe

Info

Publication number: CN2639657Y
Application number: CN 03284562
Authority: CN
Inventors: 王春廷
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-01
Filing date: 2003-08-01
Publication date: 2004-09-08
Anticipated expiration: 2013-08-01

Abstract

The utility model relates to a reducing pipe which has a shrinking diameter end. The diameter of the shrinking diameter end is less than the tube subject and the shrinking diameter end forms one body with the tube subject. The reducing tube comprises a welding tube with seams; the connection between the pipe fittings is convenient under the precondition of decreasing cost, and at the same time a basic expedite unblocked channel is provided for fluid, so flowing friction of the fluid is reduced and transportation cost is decreased.

Description

A kind of reducer pipe

Technical field:

The utility model relates to a kind of reducer pipe.

Background technique:

Pipe fitting is the member that is used for conveyance fluid, this hollow products is in the conveyance fluid process, its main body pipeline and branch line require to have the pipe fitting of different-diameter usually, and the connection of two kinds of different-diameter pipe fittings needs the pipe joint of reducing or flange plate usually as link, pipe joint or flange plate are the parts that are separated with pipeline, its ways of connecting adopts nesting type to be threaded usually, the tube wall that protrudes in internal surface that the internal surface of its connection part has pipe end to insert causes the fluid of being carried not smooth; Another problem is reduction nipple or flange plate working process relative complex, and needs the realization sealing of sealed member butt joint position when assembling, and then causes the raising of delivery line cost.

Direct rolling reducer pipe, normally for weldless tube, the patented technology that is called " tube mill for synchronously rolling to produce seamless reductor " as the name of CN1093623A bulletin, it is called oneself is to adopt special transmission, rotatable parts and reducing core, on milling train synchronously Rolling Production unidirectional or two-way in the reducing seamless tubular goods.As seen, the rolling mill practice process of this reducing weldless tube is difficult to rolling weldless tube, so its processing cost will be higher than weldless tube.

For seam welded tube is arranged, what it adopted is that the sheet material of predetermined width is made by technologies such as curling and welding, and in the technological process of curling and welding, basically along linear operating, but also do not find directly to make the method and apparatus that seam welded tube is arranged of reducing with regard to existing technology, so do not occur the seam welded tube that has of reducing on the market.

In addition, in with the manufacturing process that seam welded tube making composite pipe is arranged, particularly having seam welded tube to nest together by mechanical drawing with two makes in its operation that becomes a composite monolithic pipe, the termination that need are clamped a pipe with holding element, and then pipe carried out whole drawing, and in the clamping operation, the pipe end diameter that is held is less than tube body, and promptly the termination of pipe needs undergauge, but, in the prior art, in order to make the termination reducing of seam welded tube, adopt usually the pipe end destructiveness is pounded flat process, and blindly pound in the flat program at artificial or equipment, usually pounded the position and enlarged, cause long one section termination to damage, to such an extent as to cause a large amount of wastes of material.

The invention task:

Task of the present utility model provide a kind of make things convenient for pipeline to connect or convenient rolling composite pipe and by the reducer pipe that has seam welded tube to make.

The reducer pipe that the utility model proposed has diameter and forms the undergauge end of one less than tube body and with tube body.

Have a level and smooth changeover portion between described undergauge end and the tube body, the undergauge end also can be provided with internal thread or the outside thread that is connected with pipe fitting where necessary.

The reducer pipe that the utility model proposed, what adopt is the structure that seam welded tube is arranged and make its termination undergauge, and adopted level and smooth changeover portion in the zone of reducing, this structure is convenient to the connection of pipe fitting on the one hand, provide an expedite substantially unimpeded channel to fluid on the other hand, reduce the flowage friction of fluid, thereby reduced transportation expenses; While undergauge end helps holding element and clamps pipe fitting, for the composite pipe that is manufactured with the seam welded tube formation provides convenience.

Description of drawings:

Accompanying drawing 1 is an embodiment's of the utility model a surface structure schematic representation.

Embodiment: referring to Fig. 1, this kind reducer pipe 1 has diameter and forms the undergauge end 12 of one less than tube body 11 and with tube body 11.Undergauge end 12 accounts in 10 centimetres of the pipe ends, and and tube body 11 between have one level and smooth be the changeover portion 13 of arc substantially.For the occasion of conveyance fluid reducer pipe that pipeline uses 1, can be provided with convenient internal thread or the outside thread that is connected with other pipe fitting on the undergauge end 12, this structure promptly makes things convenient for attended operation, also provides an expedite substantially unimpeded channel to fluid simultaneously.

Claims

1, a kind of reducer pipe is characterized in that: this reducer pipe has diameter and forms the undergauge end of one less than tube body and with tube body.

2, reducer pipe according to claim 1 is characterized in that: have a level and smooth changeover portion between described undergauge end and the tube body.

3, reducer pipe according to claim 1 is characterized in that: described undergauge end is provided with internal thread or the outside thread that is connected with pipe fitting.