DE1240710B - Pipe connection piece - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

F161

German classes: 47f-9

Number: 1240 710

File number: L 42648 XII / 47 f

Filing date: August 6, 1962

Open date: May 18, 1967

Applicant:

L&L Manufacturing Company,

Warren, me. (V. St. A.)

Representative:

Dr.-Ing. H. Fincke, Dipl.-Ing. H. Bohr and Dipl.-Ing. S. Staeger, patent attorneys, Munich 5, Müllerstr. 31

Named as inventor:

Gilbert Thomas Lyon, Warren, Mich. (V. St. A.)

The invention relates to a pipe connector pipe connector

with thread on the inner end that goes into a threaded opening can be screwed in, and a smooth, cylindrical section seen in the axial direction outside of the thread, to which a shoulder 5 extends radially outward adjoins and which, when screwed in, lies radially opposite a smooth inclined surface at the entrance to the opening, in which an elastically deformable, seamless metal sealing ring with a smooth bore provides the smooth section io includes, as well as with its axially outer surface of the shoulder and with its radially outer inclined surface the opening entry inclined surface is opposite, the sealing ring when tightening the threaded connection is elastically twisted into the opening about its 15 circumferential mass axis.

In a known sealing arrangement this
In the relaxed state, the inner surface of the sealing ring is essentially parallel to the smooth cylindrical section of the 20 to be screwed in

Piece, with the contact surface of the sealing ring on

the inclined surface at the entrance of the opening somewhat rigid y

ker inclined than this surface and the contact surface of the sealing ring on the shoulder of the one outward and axially inward inclined, so that the piece to be screwed is inclined inward, or next at the beginning of the tightening of the threaded connector these surfaces of the sealing ring parallel or At the inner end, viewed in the axial direction, they run perpendicular to the opening axis, and the ent of the ring and the speaking surfaces in the inner edge of the outer surface of the ring to be screwed in, viewed in the radial direction, are inclined in opposite directions. Tight fit on the cylindrical smooth surface If with such a design a seal of the connecting piece is brought about and the internal fluid pressure rises, then by further tightening the thread there is a tendency to retract the screwed-in piece
to press outside. This will start the after
internal force at the lower end of the ring
decreased, and there can therefore be flow at this point
penetration between the insert and the sealing ring. In the known device thus penetrates
liquid that has entered the seal is inevitable
further on, creating a certain wedge effect,

whereby the sealing surfaces are pressed apart 40 tightened thread connection under radial den and the seal begins to leak. Compressive stress is. When tightening the thread

It is therefore the object of the invention, namely that the sealing ring takes the leakage connection as a result security against the known devices of its wedging between the smooth cylindrical to increase. Section of connector and smooth

According to the invention, this object is achieved by means of an inclined surface at the entrance of the threaded opening, that before tightening the threaded connection dialer direction a compressive stress, so that the surface of the bore has the smooth cylindrical ab- its exposed end, i.e. its seen axially Section of the connecting piece with its axially internal end face, elastically deformed. at touches the inner edge and the cylindrical loosening of the thread connection is formed drical surface seen in the axial direction after 50 this elastic deformation back, so that at a runs away on the outside and the unwanted slight loosening opposite the shoulder is still an impeccable one axial outer surface of the ring is retained radially after free sealing effect.

connection of the ring over the entire axial extent the inner surface is wedged against the cylindrical, smooth surface.

It is particularly advantageous to make the end of the ring which is on the inside in the axial direction butt, so that a surface extending in the radial direction is created which is essentially perpendicular to the Axis of the connector and the at

3 4

The invention is described below with reference to the knife up to a level which, on the one hand, is true

Drawings explained in more detail. It shows rotation of the pipe connector within

Fig. 1 allows an embodiment of a pipe connection ring, but on the other hand the retaining

Training piece according to the invention in side view, device of the ring in the locked position on the section

however, a sealing ring in section and while ensuring S 24.

rend of attachment to the pipe connector when the ring is pulled inwards, can

is shown, its front edge to a greater extent

F i g. 2 a section of the pipe joint can be pulled as its rear, like this

Piece is shown in sectional view after attaching the in Fig.2. Fig. 2 and 3 are the same sealing ring, i ° probably exaggerated representations because of the therein

F i g. 3 is a partial view of the dimensions contained in the threaded hole.

The ring has a radially outer beveled surface

Piece in sectional view, the sealing 30, the conicity of which is essentially that of the

ring assumes its sealing position, smooth inclined surface 14 at the entrance of the thread

F i g. 4 one opposite FIG. 1 modified opening corresponds to 15 opening; here the conical

guide shape of a pipe connector after the surfaces smooth against each other. The axial outer surface

Invention in side view, 32 of the ring, which the shoulder 34 of the six-

FIG. 5 shows the pipe connection piece from FIG. 4 in angular section 20 of the pipe connection piece

Partial representation as well as in section and facing is a smooth surface. If that

Figo the pipe connection piece and the ring 2 ° pipe connection piece in the thread opening

from F i g. 4 and 5 in the position similar to FIG. 3 is screwed in, will be the smooth surface 32 of the ring

Section as well as partial representation. and the smooth surface 34 of the hexagonal section

In the case of the in FIG. 1 to 3 shown construction 20 to the plant, and the ring is between

a component 10 is shown, which is with an inner of the inclined surface 14 at the entrance of the bore

Threaded hole 12 is provided. The entrance of the 25 shoulder 34 of the hexagonal section and the

The bore is made by a smooth inclined surface 14, a smooth cylindrical section 24 of the pipe connector.

forms. The pipe connector is compressed in Fig. 1 with extension piece. The ring is etched

the reference number 16 provided. The pipe connection table is deformed and twisted around its mass axis.

piece is twisted at its inner end 18 with a thread until it is all around the cylindrical Ab-

provided and has approximately in the middle a not 30 cut 24 is applied.

circular for engagement with a screw. The ring is sufficiently elastic that the

key specific section 20, which six- release of the screw pressure by unscrewing

can be made angular. This hexagonal part of the pipe connector from the threaded opening

has a radially outwardly extending ring in the rearward direction from the pipe connector end Shoulder 34. 35 spring-away. This allows the pipe

The hexagonal section 20 is from the connecting piece into another bore.

threaded inner end 18 can be screwed by a non-screwing, and the ring works in turn

threaded length range of the pipe in a satisfactory manner. When screwing in the

Connector separated. The non-threaded pipe connector in a threaded opening provided length range of the pipe connector 40, the pipe connector rotates within the

comprises a portion 22 of reduced thru-ring, and the ring is frictionally engaged on it

knife held within the opening following the threaded seat. The ring forms

Inner end 18 and a smooth cylindrical seal with the smooth inclined surface on the

Cut 24 of larger diameter near the entrance to the opening, with the smooth cylindrical shape

of the hexagonal part 20. The section 24 is according to 45 section of the connecting piece and with the Schtd-

Fi g. 1 provided with a rib 26, which the ab- ter 34 of the hexagonal section. It is desirable-

cut 24 from the section 22 with reduced value that the sealing stop surfaces

Diameter separates. are surface-coated.

The diameter of the rib26 corresponds to the pipe connection piece can according to FIG

approximated the tip diameter of the threaded so a thread 36 at the opposite end

provided inner end 18 of the pipe connection can be seen. In operation, this can be threaded

piece. The diameter of the section 24 is the inner end 18 of the pipe connection piece as seen in FIG

ringer than that of the rib 26. The sealing ring, with a threaded opening 12 of a component according to FIG. 3

which the pipe connection piece is provided, must be screwed on, and the radially outer screw

the section 24 locked by the rib 26 surface 30 of the ring is in contact with it

held. of the opening entrance bevel 14 is used.

The pipe connection piece 16 itself can be made of these inclined surfaces form a smooth seal,

suitable metal, for example steel, and which have an intervening loss

the sealing ring 28 may as well be prevented from the same fluid. The smooth axial outer surface

Material to be made. Initially, the ring 60 has 32 of the ring is also in immediate sealing

a bore diameter which is sufficient to abut the corresponding smooth shoulder 34

brought around it over the threaded inner end of the hexagonal part and forms a

of the pipe connector 16 and the rib liquid-tight seal therebetween.

strip on section 24, as in When the pipe fitting is inserted into the threaded

Fig. 1 is shown. 65 opening is screwed in and the inclined surfaces 14

When the ring is placed on the section 24 and 30 of the opening or the ring to rest

if it is contracted or brought inwards, the smooth axial outer surface 32 becomes

laced and reduces its bore diameter of the ring not only against the smooth shoulder 34 of the

Claims (1)

hexagonal component pressed, but also the ring contracted radially inward against the cylindrical portion 24 of the Rohmrbmdungsstuckes. Due to the fact that the ring has a small amount of play which allows it to rotate on the section 24, the ring finds its abutment against the opening-entry bevel M and the pipe connector rotates within the ring. To some extent, a polishing action takes place between the tube connector and the ring as the tube connector is screwed into the threaded opening and rotates within the ring. Should a leak occur between the bore surface of the ring and the smooth cylindrical section of the pipe connector, such leakage will continue to be blocked by the seal formed between the axial outer surface 32 of the ring and the shoulder 34 of the pipe connector. The abutment of the ring on the smooth cylindrical section of the pipe connector prevents vibration or breakage of the ring. The embodiment shown in FIGS. 4 to 6 is preferred over the arrangement of FIGS. 1 to 3. In Fig. 4-6, the unthreaded, smooth cylindrical portion of the pipe connector has a uniform diameter over its entire length. The component which is provided with the threaded opening 13 is provided with the reference number 11 and has a smooth inclined surface 15. The pipe connector is as described in connection with FIGS. It has a threaded inner end 17 and a smooth cylindrical section 19 to which a widened hexagonal section 21 adjoins. The hexagonal section 21 has a smooth, radially extending circumferential shoulder 23. A sealing ring is provided which is similar to the ring 30 of FIG. 1 and is designated here by the reference numeral 29. This ring 29 has a bore surface 31 and an axial outer surface 33. The outer surface 33 is arranged essentially perpendicular to the bore surface 31 of the ring. The ring 29 has a radially outer inclined surface 35 which corresponds to the inclined surface 15 at the entrance of the threaded opening. The outer surface 33 merges radially on the outside into an axially inwardly inclined end surface 37. The purpose of this conical end surface 37 is that the outer surface 33 forms only a limited area of engagement with the circumferential shoulder 23 of the hexagonal section 21 of the pipe connection piece. The ring shown in FIGS. 4 to 6 can be a steel ring which can be elastically constricted and deformed. This ring has an initial inner diameter so that it can be slipped over the threaded inner end 17 of the pipe connection piece onto the smooth cylindrical section 19 as shown in FIG. The ring is then narrowed to bring it against the cylindrical section. When the ring is released from the constriction shape, it springs back somewhat so that it is sufficiently free on the cylindrical portion of the pipe connector to allow relative rotation of the pipe connector within the ring. The ring is now held in the locking position on the pipe connector to the extent that it is on the one hand freely rotatable on it, on the other hand surrounds the smooth cylindrical section so tightly that it cannot be displaced over the threaded inner end. This is in FIG. 5 shown. When the ring is drawn in radially inward against the smooth cylindrical portion of the pipe connector, such drawing results in a slight tensioning of the ring so that its axially inner end is drawn together to a greater extent than the outer end. This is in FIG. 5 shown. The illustration in FIG. 5 is exaggerated because it is only a very small amount. Because of this tension, the bore surface of the ring in FIG. 5 is not shown as running parallel to the smooth cylindrical section 19 of the pipe connector. When the pipe connector is screwed into the threaded opening of the component, the ring is wedged between the opening inclined surface 15 of the shoulder 23 of the hexagonal section and the smooth cylindrical section of the pipe connector. The ring forms a tight seal between the conical entrance of the threaded opening and with the smooth shoulder 23 of the hexagonal section of the pipe fitting. The ring rests and thus seals against the smooth cylindrical section of the pipe connector. Details of the description of the drawings that do not contribute to the solution of the inventive problem in the sense of the patent application do not belong to the invention, but are merely explained in more detail for better understanding of the overall arrangement shown. Patent claims: 1. Threaded pipe connector at the inner end that can be screwed into a threaded opening is, and a smooth cylindrical section seen in the axial direction outside the thread, which is followed by a shoulder extending radially outward and the one screwed in State radially opposite a smooth inclined surface at the entrance of the opening, in which an elastically deformable, seamless metal sealing ring with a smooth bore replaces the smooth one Section includes, as well as with its axial outer surface of the shoulder and with its radial outer Inclined surface of the opening entrance inclined surface is opposite, wherein the sealing ring when tightening the threaded connection into the opening around its circumferential mass axis is elastically twisted, characterized in that the bore surface (31) the smooth cylindrical section (19,24) of the connecting piece with its axially inner edge and touched by the cylindrical Surface (19,24), seen in the axial direction, extends outwards, and that of the shoulder (23, 34) opposite axial outer surface (32,33) of the ring radially outwards and axially is inclined inward, so that initially at the beginning of the tightening of the threaded connection on the in seen in the axial direction inner end of the ring and seen in the radial direction