CN2058716U

CN2058716U - Cast-iron pipe orifice with circular section rubber ring

Info

Publication number: CN2058716U
Application number: CN 89213253
Authority: CN
Inventors: 萧德成
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-10-23
Filing date: 1989-10-23
Publication date: 1990-06-27

Abstract

The utility model relates to a cast-iron pipe orifice with a circular section rubber ring, being a cast-iron pipe orifice with a rubber sealing ring. The orifice is composed of the rubber sealing ring whose section is circular, a cast-iron pipe inserting orifice which has a step arranged at the proper point of the outer wall of the cast-iron pipe inserting orifice, and a cast-iron pipe bell orifice which has a step with a conical face at the proper point of the inner wall of the ast-iron pipe bell orifice and has a conical face at the end head point of the inner wall of the ast-iron pipe bell orifice. The flexible orifice of a cast-iron pipe has the advantages of simple structure, easy fabrication, labor saving for mounting and good tightness. Compared with the existing cast-iron pipe with the flexible orifice, the raw material of one cast-iron pipe can be saved by more than 5% (weight). The utility model can be used for a pipeline for conveying pressure fluids of water, gas, etc.

Description

Cast-iron pipe orifice with circular section rubber ring

The utility model belongs to the pipeline field, is a kind of cast iron tube flexible interface with the circular cross-section rubber seal, and this interface structure is simple, leakproofness is strong.

In general, the cast iron tube flexible interface should be simple in structure, processing, easy for installation laborsaving, and leakproofness is good again, but existing cast iron tube flexible interface often can not meet the demands simultaneously.At present domestic two kinds of common cast iron tubes of being with rubber seal are shown in accompanying drawing 1,2.All belong to " cast iron tube of plug-in type (or slipping into formula) wedge-shaped rubber circle interface ".This class flexible interface cast iron tube is because due to the structure.Following problem appears often in construction: the one, and the installation resistance is quite big, work efficiency is low; The 2nd, when installing, socket is inserted partially easily, makes the rubber seal part impaired, influences the interface leakproofness; The 3rd, after installing, can't check whether rubber seal reaches correct working position, or have or not damage, cause the pipe joint leakproofness poor, water leakage ratio height (reaching 20～40%), influences the duration to finish smoothly the pressure testing time long (the used time of pressure testing surpasses the used time of piping erection more than 10 times).In addition, the rubber seal coil structures is special, the processing mold complexity.

The utility model is intended to solve the problem that existing flexible interface cast iron tube exists, and provides a kind of simple in structure, processing, easy for installation laborsaving, the cast iron tube flexible interface that interface work leakproofness is good.

The cast iron tube flexible interface structure that the utility model provides is seen accompanying drawing 3.

In the accompanying drawing 3:

1, socket 2, bellmouth 3, rubber seal

Cast iron pipe flexible interface provided by the utility model is made up of socket (1), bellmouth (2) and rubber seal (3). The cross section of rubber seal (3) is circular. Socket (1) outer wall suitably place has a step, and bellmouth (2) inwall also has one and fits mutually with socket (1) and circular cross-section rubber seal (3) The suitable step with taper seat. In addition, bellmouth (2) inwall end is a conical surface. This conical surface can make diameter greater than the rubber seal (3) of gap width between bell and spigot (1), (2) very successfully nip drum to bell and spigot (1), (2) slit. The circular cross-section rubber seal (3) of coupling is enclosed within cast iron pipe socket (1) termination in advance, aim at cast iron pipe bellmouth (2), by artificial or equipment of small motor pulling equipment, when socket (1) inserts bellmouth (2), make be close to socket (1) termination and bellmouth (2) the termination conical surface circular cross-section rubber seal (3) along the slit nip drum between bellmouth (2) inwall and socket (1) outer wall to the operating position of interface. At this moment, rubber seal (3) is subjected to certain radial compression force and makes cast-iron pipe joint obtain tightness. The extruding degree y of rubber seal (3), the degree of reliability of decision interfaces, y can be calculated as follows:

y＝ (Dy－K)/(Dy) ×100％

In the formula: Dy---the rubber seal diameter of section

K---the width in joint socket slit

When the rating value of extruding degree y is 50%, seal with elastometic washer circle (3) diameter of section equals the twice of joint socket gap width, its interface can keep leakproofness under 20 barometric pressure, and interface is not afraid of sposh and ponding in time floods, installation efficiency height, construction speed are fast, and whether correct but frontier inspection is installed on the limit if looking into interface.The rubber seal (3) of can passing through conical surface on bellmouth (2) the inwall bottom stage plays control socket (1) location, between bellmouth (2) step and socket (1) termination, reserve certain interval, for the extension of cast iron tube when heat expansion, again can with the step acting in conjunction on socket (1) outer wall, guarantee that rubber seal (3) work puts in place.

Rubber seal of the present utility model can adopt some rubber materials with certain strong hardness to make, for example nitrile butadiene rubber, teflon rubber etc.The cast iron pipe fitting joint mouth structure both can adopt the centrifugal pressure casting of founding type, can carry out the machining manufacturing behind the trombone slide again.Large, medium and small type cast iron tube factory all can produce.

The utlity model has simple in structure, easy to process, laborsaving (have only plug-in type wedge-shaped rubber circle interface cast iron tube installing force 1/3rd) is installed, advantage such as construction speed is fast, the interface leakproofness is good, and joint socket is than each short 20 millimeter of joint socket of existing interface cast iron tube, the every 5%(weight that can save material) more than.Can be widely used in the conveyance conduit of plumbing and coal gas equal pressure fluid.

Embodiment:

The rubber seal (3) of circular cross-section is enclosed within on cast iron tube socket (1) termination in advance, aim at the center line of cast iron pipe bellmouth (2) then, by artificial or equipment of small motor pulling equipment, when socket (1) inserts bellmouth (2), make the working position of circular cross-section rubber seal (3) nip drum to interface.

Claims

1, a kind of cast-iron pipe joint with rubber ring, comprise cast iron tube socket (1), bellmouth (2) and rubber seal (3), it is characterized in that cast iron tube socket (1) outer wall appropriate location has a step, it is one suitable for the rubber seal (3) of circle with socket (1) and cross section that cast iron pipe bellmouth (2) inwall also has, the step that has conical surface, and cast iron pipe bellmouth (2) inwall end is the conical surface, rubber seal (3) is enclosed within the termination of cast iron tube socket (1) in advance, aim at cast iron pipe bellmouth (2), by drawing rubber seal (3) nip drum to the working position of cast-iron pipe joint, reach the connection sealing purpose.

2, the cast-iron pipe joint of band rubber ring according to claim 1 is characterized in that rubber seal (2) is to be made by nitrile butadiene rubber, teflon rubber.