FR2569818A3 - EXTENSIBLE CONNECTION GROUP FOR HYDRAULIC INSTALLATIONS - Google Patents

Abstract

EXTENSIBLE CONNECTION GROUP FOR HYDRAULIC AND SIMILAR SYSTEMS, CHARACTERIZED IN THAT IT IS CONSTITUTED BY A HOLLOW PART 4 INCLUDING, AT ONE OF ITS ENDS, A HEMISPHERIC SURFACE 6 AND A NUT 7 ALLOWING TO TIGHTEN IT AGAINST THE CONICAL SEAT 30 OF A THREADED ORIFICE 8 OF A VALVE 2 OR ANALOGUE APPARATUS AND CARRYING, AT ITS OPPOSITE END, A THREADED FITTING 5 THAT CAN BE SCREWED INSIDE A THREADED BORE 10 HOUSING FOR FIXING A RADIATOR OR ANALOGUE DEVICE AND CARRYING A FLAT SEAL 12 ENSURING THE WATERPROOFING IN CONTACT WITH THE RADIATOR, THE HOLLOW PART CAN MOVE INSIDE THE THREADED FITTING 5 OVER A DISTANCE BETWEEN A MINIMUM EXTENSION AND A MAXIMUM EXTENSION, THE GROUP IN QUESTION INCLUDING SEALING DEVICES THAT CAN BE TIGHTENED AND ENABLING THE SEALING BETWEEN THE HOLLOW PART 4 AND THE FITTING 5 IN ALL THE POSITIONS TAKEN WHEN THE HOLLOW PART IS MOVING.

Description

1 2569818

  The present invention relates to an expandable connection group for hydraulic installations. In domestic heating installations, radiators supported by the building structures are used which are supplied by pipes.

  with regulating and stop valves.

  For the assembly of these valves to the inlet and return pipes of the radiators, threaded connecting members are used which are tightened by means of bands, tow, pastes or the like.

  applied to threads to seal.

  This operation is usually carried out when the radiator and the pipes are already fixed in their respective positions and the connecting members in question must then be screwed more or less to compensate for the inevitable errors of

  relative position of the radiator and the pipes.

  We proceed by successive attempts by gradually pushing the screwing up to the

desired distance.

  However, this adjustment cannot be made, or can only be carried out in a very limited manner, in the opposite direction, since this operation would adversely affect the seal at the thread; if necessary, dismantle the connection element, re-install the threaded coupling, then screw on the parts again, in a smaller quantity, progressively

up to the correct distance.

  The assembly process which has just been described therefore turns out to be quite long and laborious and strongly influences

  on the cost of assembling the entire iTn.s-

heating].

  The problem that arises is therefore that of putting

  at the point of a connection group which allows an adaptation

  Quick measurement of dimensions at different installation positions for pipes and radiators, easy assembly and the creation of secure sealing devices

and durable.

  The connection elements known so far are composed of several separate elements which must be

  assembled before or during installation of the installation.

  These elements normally include a hollow part comprising a hemispherical end which can be pulled tight by a nut against a conical seat formed in the orifice.

  valve coupling and thus ensuring sealing.

  This seal is fairly good, but can be com-

  promised by possible faults or by damage to the hemispherical surface or to its conical seat which may then no longer be surfaces of revolutioa

flawless.

  We have therefore considered the use of coupling devices comprising elastomers which can be tightened, but these devices, the thickness of which is quite large and which can undergo significant deformations,

don't have a long duration.

  The object of the invention is to produce a connection or connection member which is already mounted in its> 0 essential parts and which has a device for

  fitting located at the orifice of the valve or similar devices

  logues, consisting of a coupling between metal surfaces-

  revolution revolution and able to avoid or compensate

possible surface defects.

  This object is achieved, according to the invention, by the use

3 2569818

  of an expandable connection group for hydraulic or similar installations which is constituted by a hollow part comprising at one of its ends a hemispherical surface and a nut making it possible to tighten it against the conical seat of the threaded orifice of a valve

  or a similar device and comprising at its other end

  mite a threaded connection which can be screwed into a threaded bore connecting a radiator or similar device,

  the hollow part in question being able to penetrate the coupling

  threaded cord over a distance between a minimum limit and a maximum limit, the group in question

  comprising devices ensuring sealing by means of

  rage between the hollow part and the fitting in all

  penetration positions of the hollow part.

  More particularly, the threaded connection in question comprises a first hollow part of polygonal shape.

  and a second cylindrical hollow part and, inside

  laughing, a threaded sleeve screwed onto a thread located at the end of the hollow part in question and comprising an enlarged zone of polygonal surface which can be coupled so as to be able to slide in the axial direction and to be

  blocked in the direction of rotation relative to the first

  first hollow part and a second cylindrical zone acting

  at the end against an annular packing surrounded by

  rant a tapered flared part of the hollow part, this annular lining being able to be pushed by the sleeve on the flared part while ensuring the sealing at the level of the flared part and of the internal cylindrical wall of the fitting following a reciprocal rotation screwing the hollow part and the fitting, any relative rotation

  the sleeve and the threaded connection being impossible.

  This annular packing can be a metal packing, preferably copper, or it can

  be made of elastomeric material.

  In addition to this annular packing, the hollow part includes a seat which can receive an O-ring of elastomeric material ensuring the seal on contact.

  of the inner cylindrical part of the fitting.

  To facilitate assembly, the hollow part has one or more external flats allowing a grip

  by a key or similar device.

  The hemispherical surface of the end of the hollow part is provided with a coating of elastomeric material of limited thickness; this coating of elastomeric material on the hemispherical surface of the end must have a

thickness less than 0.4 mm.

  To facilitate use, the elements that make up

  kill the connection group according to the invention are assembled

  blocked before use, the hollow part comprising an axial stop element preventing any accidental dismantling

of the elements themselves.

  Various other features of the invention res-

  emerge from the detailed description which follows.

  An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing. Figure 1 is a partially sectional view of the

  connection group according to the invention in position of ex-

  maximum tension, the linings not being tightened.

  Figure 2 shows the group of Figure 1 in

  the case where the fittings are tightened on the radiator.

  Figure 3 shows the connection group in posi-

  tion of maximum contraction, the linings being tight.

  As shown in Figure 1, a radiator 1 is coupled

  plé a valve 2 through a group of con-

  nexion 3. This group consists of a hollow part 4 which carries at one of its ends a threaded connection 5 allowing coupling to the radiator and, at its opposite end, a part having a hemispherical surface provided with the nut 7 allowing coupling with the orifice

thread 8 of valve 2.

  In more detail, the threaded connection 5 has an external thread 9 which can be introduced into the threaded bore 10 of the radiator, generally of large diameter, and extended by a flange 11 comprising a seat for a lining 12 made of elastomeric material. capable of sealing when tightening the connector 5, at the surface 13 of the radiator 1. The thickness of the lining 12 and the depth of its seat in the flange They are chosen so that, during tightening, the end surface 14 of the flange 11 comes into contact with the surface 13 of the radiator 1 by compressing the lining 12 by the amount necessary to obtain a suitable seal.

  This device has the advantage of allowing the com-

  optimum pressure of the packing 12, regardless of the amount of tightening torque applied; moreover, the lining 12 is protected in this way against external light which, consequently, does not shorten its duration.

  Inside, the connector 5 has a first part

  tie in the shape of a hexagon 15 or of polygonal shape, and then a hollow cylindrical part 16. In the first part 15, of hexagonal or polygonal shape, of the fitting 5 is inserted a sleeve 17 which has an end 18 widened along a hexagonal or polygonal contour, and coupled so as to be able to move in the axial direction and to be locked in the direction of rotation relative to the

  part 15 and has, inside, a thread 19 for

  before engaging with thread 20 made in the former

end of the hollow part 4.

  The thread 20 has, at a short distance from its end, a flat part 21 which can receive an elastic locking ring 22 preventing any accidental disassembly

of the group before its implementation.

  At the end of the thread 20, the hollow part 4 has a conical widening 23 whose opening angle a must be less than 80. This conical enlarged part contains a deformable sealing ring 24 which must be made of metallic material, for example copper or other materials for fittings which do not practically change over time. In addition to its enlarged conical part 23, the hollow part has a zone

  cylindrical 25 on which is the seat of a gar-

  O-ring 26 ensuring sealing at the level of the

  O10 cylindrical surface 16 of fitting 5.

  The hollow part 4 also comprises a cylindrical part.

  that 27 having a diameter larger than that of part 25

  and having two or more opposite flats 28 allows

  both grip by a wrench for tightening.

  The hollow part 4 ends in the hemispherical surface

  risk 6 on which it is advantageous to apply a surface coating 29 of elastomeric material having a

  reduced thickness not exceeding 0.4 mm and capable of

  think of possible imperfections or deformations of the surface of the conical seat 30 corresponding to the orifice 8 of

  valve 2 without leakage being compromised by use

  lization of a very thick lining of elastomeric material. Between the cylindrical part 27 and the spherical surface 6, the device has an annular relief 31 offering

  pressing the nut 7 during its tightening against the orifice 8.

  Using the connection group according to the invention

  already fully assembled, assembly can be carried out

  radiator 1 and valve 2 in a particular way-

  fast by easily compensating for any differences

  tuelles in the distance between the radiator 1 and the valve

  2 already connected to the installation tubes.

  In fact, with the connection group under minimum length conditions, in which the threaded connection 5 bears against the start of the cylindrical part 27, the connection 5 is fully tightened on the

  radiator, the seal being ensured by the lining 12.

  The connection group can then be extended so that the hollow part 4 can move in the threaded connection 5 until the spherical surface 6 comes into contact with the conical surface 30 of the orifice 8 of the valve 2. A rotation of the hollow body 4, obtained by means of a key applied to the flat 28, causes the hollow part 4 itself to be screwed inside the sleeve 17 which, being unable to rotate because of its polygonal end 18 held by the corresponding polygonal bore 15, acts on the sealing ring 24 by pushing it against the widened conical part 23 until clamping it against the surface 16, as shown in FIG. 2, thus increasing

  the effectiveness of the seal provided by the lining 26.

  The use of a copper ring 24, in particular,

  ensures, even for a long period, excellent water resistance

  chewiness, which can be further improved, in case of possible leaks, even after a fairly long time, by tightening

further the: hollow part 4.

  When the tightening of the hollow part 4 is carried out, the assembly can be completed by definitively tightening the nut 7 on the orifice 8 of the valve 2. The complete movement of the group remains between the maximum shortening indicated by FIG. 3 and the maximum extension represented by FIGS. 1, 2, with enlargement 18 to

  proximity to the bottom surface of polygonal shape 15 to

  beyond which it is no longer possible to extend the

  cord; this displacement can be chosen by giving dimensions

  sions suitable for the lengths of the different parts which constitute the threaded connection 5 and the hollow part 4, so as to easily compensate for position tolerances

  between the valve and the radiator which are generally reali-

  and are easily made superior to those that

  allow traditional techniques.

8 2569818

  The metal gasket 24 also has the function, when tightened, of ensuring a mechanical blocking of the extension of the fitting and consequently of pocketing any det'ormation after assembly, such as for example those which would be due to the pressure internal or mechanical causes, It is obvious, in particular for those skilled in the art, that, although it has been described especially for the coupling of valves and radiators of a heating installation,

  the connection group according to the invention can be used

  read in multiple different applications each

  once it has construction advantages.

Claims (6)

I - Expandable connection group for hydraulic and similar installations, characterized in that it consists of a hollow part (4) comprising, at one of its ends, a hemispherical surface (6) and a nut (7) allowing it to be clamped against the conical seat (30) of a threaded orifice (8) of a valve (2) or of a similar device and carrying, at its opposite end, a threaded connection (5) which can be screwed to the interior of a threaded bore (10) formed for fixing a radiator or similar device and carrying a flat lining (12) ensuring the seal in contact with the radiator, the hollow part being able to move with the inside the threaded connection (5) over a distance between a minimum extension and a maximum extension, the group in question comprising sealing devices which can be tightened and making it possible to seal between the hollow part (4 ) and the fitting (5) in all positions taken when moving of the hollow part.   2 - Connection group according to claim 1, ca-   characterized in that the threaded connection (5) has a first hollow part (15) of polygonal external shape   and a second cylindrical hollow part (16), its interior   laughing containing a threaded sleeve (17) screwed on a file-   tage formed at the end (18) of the hollow body provided with an enlarged zone of polygonal surface which can be coupled so as to be able to move in the axial direction and to be   blocked in the direction of rotation relative to the first   first hollow part and a second cylindrical zone acting   sant at its end on an annular packing (26) surrounding a widened part in the shape of a hollow part, this annular packing being able to be pushed by the sleeve against the widened part so as to seal the enlarged part itself same and on the inner cylindrical wall of the fitting after a rotation -10 22 569 818   relative ensuring the installation of the hollow part and the fitting, any relative rotation between the sleeve and   the threaded connection being impossible.   3 - Connection group according to one of the claims   1 or 2, characterized in that the lining (24) in question is a metal lining, preferably made of copper. 4 - Connection group according to claim 2, characterized in that the annular lining (12) is in elastomeric material.   - Connection group according to one of the claims   1 to 4, characterized in that the hollow part (4) comprises a seat capable of receiving an O-ring (26) made of elastomeric material ensuring the sealing at the level of the   inner cylindrical wall of the fitting.   6 - Connection group according to one of claims   1 to 5, characterized in that the hollow part (4) has one or more external flats (28) allowing a grip   by a key or similar devices.   7 - Connection group according to one of claims   1 to 6, characterized in that the hemispherical surface (6)   located at the end of the hollow body (4) is provided with a   garment of elastomeric material (29) of limited thickness.   8 - Connection group according to claim 7, ca-   characterized in that the coating of material (29) elas-   end of the hemispherical surface thickness less than 0.4 mm.   9 - Connection group according to one of claims   1 to 8, characterized in that the elements which constitute it   are mounted before use, the hollow part (4) comprising an axial stop element (22) pocketing the   accidental dismantling of the elements themselves.