DK174297B1 - Pressure connection device, luminaire and method of manufacture thereof - Google Patents

Abstract

Press connection of a connection piece of a tap (1) or of a fitting of cast metal to a conduit (5) whose crushing yield point and modulus of elasticity are greater than those of the connection piece (2). The wall thickness of the piece (2) is so dimensioned that it can be pressed onto an elastic conduit (5) adapted to its internal diameter. Since, for example, in the case of a plastic or copper conduit the crushing yield point and the modulus of elasticity of the conduit are smaller than those of the piece (2), an elastic support sleeve is pushed into the pipe, its crushing yield point and modulus of elasticity being greater than those of the piece (2), pressing the plastic conduit sealingly against the piece (2). <IMAGE>

Description

DK 174297 B1

PRESS CONNECTION LAYOUT. FITTING AND PROCEDURE FOR MANUFACTURING THEREOF

The invention relates to a press connection device according to claim 1, a building set 5 according to claim 10, a luminaire according to claim 11, a method for producing a fluid-tight press connection according to claim 15 and a method for producing the luminaire according to claim 17.

The pipe connection plugs and the pipe connection plugs, respectively, on fixtures and fittings 10 of metal castings were heretofore connected to a pipe with an internal or external thread or an internal or external solder end. When installing, for example, a domestic hot water system, the pipes and fittings were screwed together with fittings, thereby sealing the thread with hemp and grease, or brazing, requiring expert cleaning and heating of the parts to be connected. . The mounting was time-consuming and, if not done professionally, could lead to leaks.

For the purpose of thin-walled steel pipes, so-called high-alloy, corrosion-resistant, non-rusting steel press fittings (DE-PS 20 1.187.870) have already been used, whereby a copper ring in the pipe ends and the fitting in electrically conductive contact was further placed in pipe connection (EP-B-0.198.789 - company publication Mannesmann Edelstahlror, "Mannes-mann-Presfitting-System aus nichtrostenden Ståhlen", edition March 1985). These press fittings are made by plastic molding and have spike-shaped ends, each of which receives a sealing ring. The ends of the steel pipes to be connected are pushed into the press fitting and a fitting part located directly in front of the socket located at the fitting end becomes, by means of a special electromechanical pressing tool, into which cylinder a press tray adapted to the nominal diameter is inserted. , adapted with a compressive force of 100 kN, whereby fitting and pipes in this area are almost transformed into a hexagon.

DE-A-16 50 193 discloses a fluid-tight connection between a stirring area with annular sharp-edged structure formed on the tube surface, in which the soft material of a flange having a wedge-like tension over the outer sheath of the flange is squeezed during pressing. The flange is pressed against the structured tube by means of a lowering in such a way that the flange material seals tightly around the surface structures of the pipe area.

The connection known from DE-A 16 50 193 cannot be used in the sanitary installation technique due to the high pressures and the expensive press apparatus which is not portable by an installer to any connection point. The pressure fittings known from DE-PS-1.187.870 and EP-B-0.198.789 can only be used in the sanitary installation technique for connecting pipe lines. The known pressure fittings are not applicable for connecting contact areas with the luminaires. This continues to happen in the way mentioned in the introduction. The plumber must therefore include the necessary material and the corresponding tool both for connecting the pipes with the fixtures in the usual manner and for connecting the pipes by means of press fittings. The various connection techniques further complicate the installation work and the problems already mentioned continue to exist.

The object of the invention is to provide a simple, reliably dense and mechanically strong connection of the kind mentioned in the introduction, which can be manufactured quickly, in which fixtures and fittings of metal castings as well as plastic pipes can be used.

The solution to the task according to the invention with regard to the press-connection device is characterized by those of claim 1, with regard to the construction set, those of claim 10, with regard to the luminaire those of claim 11, the method of manufacturing the luminaire according to the features of claim 17.

30 3 DK 174297 B1 In the following, exemplary embodiments of the invention are explained in more detail with the aid of the drawings. Showing in:

FIG. 1 is a longitudinal section through a section of a luminaire with 5 connecting plugs in which a pipe is in the non-compressed state; FIG. 2 is an enlarged section of the connecting plug with tubes and a section of the fitting jaws of a pliers in the pressed state; FIG. 3 is an enlarged section of a section through the connector along the line III-III of FIG. 2 in the pressed state; FIG. 4 is a longitudinal section through a connection with a support bush; and FIG. 5 is a longitudinal section through a variant of the connection of FIG. 4th

In the embodiment shown in FIG. 1 (not yet compressed) to a luminaire 1 (down valve), there is a pipe 5 in its connecting plug 2. Tube 5 and connection plug 2 are compressed tightly and mechanically by a pressing method described below.

The luminaire 1 and the plug 2 consist of red goods. The pressure limit and the modulus of elasticity for the plaster of red goods are less than for the pipe 5, which consists of non-rusting steel.

(A thrust material can also be used whose pressure limit is equal to the pressure limit of the tube 5). By pressure limit is meant the flow limit of a sample of the material which can be determined by a pressure test. It is defined by the coefficient of a compressive force Ff, in which the increase in a force length change curve during the occurrence of a noticeable, permanent jerk shows an initial volatility and the initial cross section Ao. (In the case of missing or indeterminate volatility, the coefficient of a force F0, 2 which gives a permanent break of 0.2% and the initial cross-section Ao of the sample shall be substituted in this place). The elasticity is a playable ability, here the thrust 2, to abolish the shape and / or volume change caused by a compressive force as described below, except for a permanent plastic transformation.

5 The red goods alloy is a red goods 2 according to DIN 1705 with 2% Sn, 8% Zn and 5%

Pb, which is added nickel, so that the nickel content is 2.2-3.0%. the rest of the alloy is copper. The nickel addition increases the fracture elongation and enables the plastic transformation without cracking by the later described pressing. A nickel content above 3% gives too brittle material. At the high 10 lead content, good machining is possible.

To obtain a high plasticity and elongation at break, the luminaire 1 is glowed after casting at a temperature of 200-500 ° C for one hour.

The wall thickness of the nozzle 2 is so dimensioned, preferably between 1 and 2 mm, that the nozzle 2 can be pressed close to the tube 5 adapted to its internal diameter by means of a pair of pliers and withstand a return of the tube due to its elasticity after the relief. following the pressing with the tongs described below. At the relief after pressing, the elasticity of the tube presses the tube sealing 20 and turns, pull and push firmly against the butt.

In order for the inner surface 6 of the plug 2 to press firmly against the surface of the tube 5, it is turned smooth. The swivel grooves can be seen with the naked eye. At the pressing described below, the pivot grooves are flattened, thus contributing 25 to the seal.

On the outside, the plug 2 has a ring bead 7 and on the inside 6 one into this projecting ring groove 9. The ring groove is also extended. Also in the region of the bead 7 and the ring groove 9, the wall thickness is shaped approximately as in the rest of the butt 2. In the ring groove 9 is inserted a sealing ring 8. The diameter of the sealing ring 8 is dimensioned so that it does not protrude or only to a small extent in the inlaid condition. 5 DK 174297 B1 in addition to the inside 6 so that the tube 5 can be inserted into the plug 2 without damaging the sealing ring 8. Before the insertion, the tube 5 is deburred and, if necessary, beveled.

The annulus 7 has a distance from the free end of the stud 2, this distance being 5 dimensioned such that the end portion 12 of the stud extending beyond the annulus 7 has at least the same width as a jaw 15 and 16 described below on the pliers and is pressed on the tube 5 using this pliers.

At a distance of almost 2/3 of the pipe diameter from the free end of the nozzle 2, the inner surface 10 6 is retracted by approximately the thickness of the tube 5 and then in a ring step 13 passes into the unworked part. The step height is adapted to the pipe wall thickness to largely avoid swirling in the flowing fluid. During the turning, on the one hand, the raw casting skin which would be disturbed by the later pressing is removed, and on the other the precisely visible turning grooves contribute to the seal on the later pressing. Compared to the usual threaded connection described above, the plug according to the invention is provided with a thinner wall thickness in the plug. The wall thickness can already be thinned during casting, as no threading is required. When turning out, the wall thickness is further reduced, so that the lateral 2 at the later mounting is impeccable and 20 without cracks can be pressed with a pair of pliers.

The pliers have an upper jaw 15 and a lower jaw 16. Both jaws 15 and 16 have on their pressure surfaces a recess around the bead 7. This is designed so that, when compressed, it first presses on the bead upper edge and then on the bead edge and the few mm cylindrical surfaces removed from the bead 7 on the plug 2. Upon pressing, the sealing ring 8 in the FIG. 2 to the surface of the tube 5 and the length of the nozzle is increased slightly. As seen in FIG. 3, the jaws 15 and 16 form on both sides of the bead 7 in the closed state, as seen in FIG. 3, a hexagon. On pressing, the butt 2 is pressed 30 at each of six places on both sides of the bead 7, the bead 7 being reshaped as a whole. In this impression, the plug 2 is pressed tightly against the tube 5, whereby the places of insertion connect the two parts pivotally, pressurally and tensile.

As both sides of the bead 7 are reshaped, the depth of depression to obtain the necessary turning, compressive and tensile strength can be dimensioned in the area of plastic deformation of the butt 2 so that 5 cracks do not appear in the red goods.

If several luminaires are to be connected with each other from end to end, a short connecting piece is inserted from one end to the other. Both studs are pressed one after the other with the pliers sealing on the pipe piece. The connector cannot be seen from the outside.

The luminaires may also be configured such that the inlet nozzles are formed as bumps with bead 7 and groove 9, with inset sealing ring 8, and the outlet nozzles are designed as pipe nozzles, whereby the outer diameter of the nozzle is adapted to the inside diameter of the inlet nozzle. Such luminaires can be inserted directly into each other without intermediate pieces and can be clamped tightly with the pliers.

Pipes can be connected directly to the input plug, whereas pipes are connected to the outlet plug with a connecting fitting with a bead with sealing ring on each of its ends by pressing with pliers. The input jacks can also be formed as pipe jets, and the outlet jacks can be designed as beads with a bead and sealing ring that can be slid over the input jacks.

If several pieces of pipe are to be connected to each other with straight or bent fittings or branches (T-pieces), the connection plugs of the fittings can be made analogous to those of the fixtures. The ring step 13 is by means of a fitting designed as a sleeve in the middle thereof as a ring step, whereby the milling is carried out from both ends.

The lower pressure limit of the tube 2 relative to the tube 5, as well as the smaller modulus of elasticity of the tube 2 relative to the tube 5, also without a sealing ring 8, creates a close connection between the tube 2 and the tube 5, since the tube 2 is plastic deformed stronger than the tube 5. The elastic tube 5 presses against this plastically deformed 7 connector 2. With the sealing ring 8, a long-term sealing effect is ensured over many decades, especially at high conduction pressures. In dilatation induced movements and forces are maintained by the pressing points on both sides of the bead 7 away from the sealing ring, thereby avoiding any abrasive movements on it.

5 The compression is tight, its long-term density is only increased by the sealing ring.

If there are not too high requirements for the density of the connection, sealing can also be worked only by means of the sealing ring 8, whereby the pressing must only be made so strong that the sealing ring 8 is sufficiently pressed, and so that the stubs and pipes are kept in shape on both sides. of bead 7, for, as already mentioned, 10 to keep movements away from the sealing ring.

Problems, such as those previously encountered using internal and external threads, internal and external solder ends, and the corresponding transition pieces, respectively, are eliminated by the new embodiment.

15

With the invention's fittings and fittings of metal castings, especially of red goods, all connections between the conduits and fittings in a housing installation can be made simply by pressing the pipe connection fitting of the fittings and the fitting respectively to the conduit 5 by means of pliers. The invention thereby utilizes the surprising realization that the metal bonding, preferably an annealed red alloy having a nickel content of 2.2 to 3%, consisting of connecting plugs can deform plastically to a sufficiently mechanical and liquid-tight connection when dimensioning its wall thickness corresponds to suitably thin and pushes it into a tube adapted to its inner diameter without causing it to crack. This is surprising because metal castings, especially red ones, are brittle and so the trade world has so far had the impression that it could not be deformed, at least not without cracking. The luminaire and the fitting according to the invention, respectively, can be made by the usual simple molding technique. The cumbersome deformation (printing) of the previous 30 high-alloy steel press fittings lapses, and the casting technique enables the manufacture of special shapes which cannot be practically manufactured by plastic deformation 8 DK 174297 B1. The invention furthermore enables two luminaires to be connected to each other, the connecting plug of one luminaire being pushed over a fitting pipe fitting adapted to the other luminaire and compressed therewith.

5

As both sides of the bead 7 are pressed with the pressing tool, the depth of the plastic deformation can be kept low, whereby a dense metal connection can be obtained during compression, and the sealing ring then serves only as additional protection for the tightness of high pressure shocks, conduction pressures and shakes.

10 Instead of the steel pipe 5, a pipe 21 of plastic, copper or other material may also be used, the pressure limit and modulus of elasticity being less than that of the plug 2.

Into this tube 21 is pressed, for example, as shown in FIG. 4 in a non-compressed state, a support sleeve 23. The pressure limit and the modulus of elasticity of the support sleeve 23 are greater than for the pipe 21 and greater than for the plug 2.

The material of the support sleeve 23 conforms to the fluid flowing through the tube 21 and the requirements of pressure limit, modulus of elasticity and processability; steel with and without coating is preferred, a bronze or reinforced plastic. The support bushing 23 has a cylindrical bushing tube which narrows toward one end and has a flange 27 at the other end. The constriction is designed so that the support sleeve 23 can be inserted with up to about 20% of its length into the tube 21 and at increased pressure while expanding the tube 21 into it until the flange 27. The support sleeve is fixed in the tube 21. The wall thickness of the sleeve tube 25 decreases. towards its free end to allow 25 less resistance to the flowing water. When mounted, the tube 21 is inserted into the plug 2 with the sealing ring 8 embedded in the ring bead 7, and the plug 2 is pressed against the support bush 23 by means of the jaws 15 and 16 of the tube 21 for support 21 between the pipe 21 and the support bush 23 surface of the sleeve 25 having recesses. The elasticity 30 of the support sleeve 23 presses the tube 21 from the inside to seal, rotate, pull and press firmly after pressing against the inside of the plug 2.

9 DK 174297 B1

For manufacturing reasons, there is often another bead not shown on the butt 2 on the side facing the bump end 7. This second bead may also be shaped as a hexagon. During pressing this second bead must be at least 2-3 mm away from the facing edge of the pressing surface of the pressing jaws 15 and 16. At a shorter distance, small material cracks may appear which appear unsightly on the outside of the plug. but not significantly affect the quality of the press connection. In order to get a flawless compression, any wall reinforcement in the plug must only start after the above distance.

10

Also, as shown in FIG. 5 in the unpressured state, be configured as a double sleeve in which a cylindrical inner sleeve member 33 sits within a cylindrical outer sleeve member 35. The inner and outer sleeve members 33 and 35 are connected to each other by a connecting member 37. In the assembly, the double sleeve 31 is slid. so on the tube 21 that a surface 39 facing the outer sleeve member 35 of the inner sleeve member 33 with a clearance of clearance abuts the inner wall of the tube 21 and a surface 41 facing the inner sleeve member 33 of the outer sleeve member 35 against the tube cap of the tube 21 with a clearance of tolerance.

20

The wall thickness of the inner sleeve 33 decreases towards the end facing away from the connection 37. This reduces the water resistance in the built-in condition. The double sleeve 31 has four radially open openings at the surface 41 at approximately the same distance from each other, notes 43a-d. In the groove 43b, a sealing ring 45 is inserted. During pressing, the plug 2 with its sealing ring 8 is pressed by means of the jaws 15 and 16 of the pliers against the outer surface of the outer sleeve member 35. The outer sleeve member 35 pushes the tube inner surface of the tube 21 into the grooves 43a. , 43c and 43d and against the sealing ring 45. Hereby the tube 21 is connected formally and due to the clamped sealing ring 45 tightly with the double bushing 31. This pipe connection has distinguished itself by tubes of low elasticity and creeping tube material.

Instead of radial grooves 43a-d, only a single groove such as groove 43b may be formed to receive the sealing ring 45, while the remaining surface 39 is pierced by several grooves in such a manner that steps and depressions occur. 5, which allows a mold engagement with the pipe inner wall during compression.

Since copper pipes could hitherto only be soldered by a person skilled in the art of corrosion after thorough and careful cleaning, the above-described connection, using the support sleeve 23, provides a substantial work relief 10 and a faster manufacturing ability for the compound. For example, plastic pipes and other pipes with low elasticity can be compressed easily by means of struts 23 and 31, respectively, with struts or fittings as well as with copper pipes.

Instead of pressing the plug 2 in six places on both sides of the bead 7, more or less preferably, more than six pressure locations can also be used.

The right number of printing sites depends on the materials to be compressed and their wall thicknesses.

The thrust 2 can, in the case shown in FIG. 4 and 5 are made of steel or other material, such as plastic.

Claims (17)

1. A press connection device, characterized by a connecting plug (2) on a luminaire (1) or a fitting of metal molding, is pressed onto a pipe (5.21), which pipe in the region of the press connection does not exhibit significant wall thickness changes or is either not is reinforced or provided with a support bush, the pressure limit of the connecting plug (2) being at most equal to the pressure limit of the tube (21) and the supporting bushing (23, 31), respectively, and the modulus of elasticity of the support bushing being greater than the modulus of elasticity of the tube (5) receiving the supporting bushing; the tube (5) and the support bush (23, 31), respectively, attempt to restore their shape to a greater extent than the connecting rod (2) after the pressure pressure active during the printing operation is removed to push the tube down on the plastic deformed connecting plug (2). ), the wall thickness of the connecting plug (2) being dimensioned to withstand the support (15) of the pipe (5) respectively. the recovery (23), which is due to their elasticity after the pressure is removed. Device according to claim 1, characterized in that the connecting plug (2) and the pipe (5) and the supporting bush (23, 31), respectively, are made of different materials and the pressure limit and the modulus of elasticity of the connecting plug (2) are less than the pipe (5). and the support bush (23,31) respectively. Device according to claim 1 or 2, characterized by sealing means (8) between the inner wall of the connecting plug (2) and the outer wall of the pipe (5.21). 25 Device according to any one of claims 1-3, characterized in that the support sleeve (31) has an inner sleeve (33) and an outer sleeve (35) abutting the outer casing of the tube (21). , both of which are compressed molded around the pipe (21), the inner bushing part (33) being connected to the outer bushing part (35) at a connector (37) around the front of the pipe end. Device according to claim 4, characterized by sealing means (45,8) between the inner bushing part (33) and the pipe (21) and / or the outer bushing part (35) and the connecting rod (2). Device according to one of Claims 1 to 5, characterized in that the wall of the connecting plug (2) and the pipe (5.21) is so deformed plastically that a mold engagement exists between them. Device according to one of Claims 1 to 6, characterized in that the connecting plug (2) 10 is pressed on the tube at several points along the circumference at a distance from each other (5.21) or that the tube (5.21) is compressed together. with the support bush (23, 31). Device according to one of Claims 1 to 7, characterized in that the connecting plug (2) 15 has an annular bead (7) on the outside and on the inside one into this protruding ring groove (9) in which a sealing against the pipe is inserted. (5) the sealing ring (8) and the annular bead (7) spaced apart from the free end of the connecting rod (2) and the connecting rod (2) on both sides of the annular bead (7) being compressed into engagement with the tube (5) so that the pipe portion 20 lying between the two compressed parts is secured against axial displacement and against rotation relative to the sealing ring (8). Device according to one of claims 1-8, characterized in that the pipe (5) is a connecting pipe piece formed in one luminaire (1) or the fitting, so that it is possible to make a direct connection with another fitting. Building kit for manufacturing the connector according to one of claims 1 to 9, characterized by a first fitting (1) or a first fitting of metal castings with at least one tubular threadless connection plug (2) and a second fitting or a second fitting having at least one a threadless pipe end piece (5.21) with (25.31) or without a support bushing reinforcement (25, 31), and 11. The luminaire (1) for the kit according to claim 10 for use in the kit according to claim 10, characterized in that it consists essentially of a red alloy 20, preferably with at least approx. 2% Sn, 8% Zn, 5% Pb, 2.2 to 3.0% Ni, and a residual copper, with a tubular thread-free connector (2) of a wall thickness of 25 to 1 mm and no significant changes in and which can be plastically compressed by means of a pliers without cracking and in fluid-tight manner with a pipe end piece (5.21) on another fitting or other fitting of the building set according to claim 10, which pipe pipe is adapted to the inner diameter of the connector (2). Luminaire (1) according to claim 11, characterized in that its connecting plug (2) has at least one ring bead (7) on the outside and 5 on the inside a ring groove (9) which projects into the ring bead and wherein a sealing ring (8) can be hospitalized. 12 DK 174297 B1 Luminaire according to claim 12, characterized in that the annular bead (7) is arranged at a distance from the free end (12) of the connecting rod (2) and the distance is such that both the end portion (12) protrudes over the annular bead (7). ) and the portion of the connecting rod (2) lying on the other side of the bead (7) can be compressed with the tube (5,21) by means of a pair of pliers, the bead (7) being designed to apply the pliers (15, 16) jaws. 13 DK 174297 B1 The inner surface of the connecting plug (2) and the outer surface of the pipe end piece (5) are designed to be assembled only if the clearance is required, the pressure limit of the connecting rod (2) is at most equal to the pipe end piece (5) and the reinforced pipe end piece (21) respectively. that when the pipe end piece (5) is inserted or when the pipe end piece (21) is reinforced, the connecting rod (2) can be deformed plastically without cracking 10 by means of pliers placed thereon and the cross-sectional contour obtained after the deformation cannot be restored at the inserted pipe end piece (5) the resilient restoring force of the reinforced pipe end piece (21). 15 The luminaire according to claim 11, characterized in that the inner surface of the connecting plug (2) on the outside of the pressing area has an annular step (13) so that the pipe end piece (5, 21) can be inserted and the step height preferably corresponds approximately to the pipe wall thickness respectively. the outer diameter of a support bush (23,31) which can be mounted on the pipe end piece. 30 14 DK 174297 B1 Claim 1 or claim 4, characterized in that the connecting plug (2) is pushed into the pipe (5) or the supporting bushing (31) is pressed into the pipe end or the inner or outer bushing parts (33, 35) of the support bushing are placed on the pipe. and the connector (2) is pushed into the tube (21) reinforced by the support sleeve and then the connector is pressed by means of a pliers of plastic deformation against the tube (5) and the tube (21) reinforced with the support sleeve (25). , 31). A method for preparing a fluid-tight press connection according to either Method according to claim 15, characterized in that, during pressing 15, depressions in the connecting rod (2) are pressed at various points which are spaced apart from each other along its circumference, which depressions create a mold enclosure between the connecting rod (2) and the tube ( 5.21), respectively, between the connector (2) and the tube with the support bush (23, 31). Method for producing the luminaire (1) according to claim 11, characterized in that it (1) is molded from a red alloy, preferably with at least about 2% Sn, 8% Zn, 8% Pb, from 2.2 to 3. 0% Ni, the remainder being copper and glowing at a temperature of 200 - 500 ° C for at least one hour, so that its molded connection plug can be pressed plastically by means of pliers without cracking and in fluid-tight manner. a pipe end piece (5.21) on another fitting or other fixture of the building set according to claim 10, said pipe end piece being adapted to the inside diameter of the connecting plug (2).