DE2325378A1 - FLUID-TIGHT PIPE CONNECTING DEVICE - Google Patents

Description

DR. MÜLLER-BORe DIPL-PHYS, DR. MANlYZ DiPL.-CHEM. DR. DEUFEL DIPL.-iNG. FINSTERWALD DIPL.-ING. GRÄMKOW

Munich, the te. MAY 1173

Hl / f e - G 2326 '

]? lui dicht e pipe connection device

The invention relates to a fluid-tight pipe connection device.

It is known to attach a pipe to a pipe block, by welding the pipe directly to the pipe block or brazed or by a threaded coupling device is used ^ to which a packing or seal is assigned to connect the pipe to the pipe block and creating a fluid-tight connection between them.

The subject of the invention is a device for connecting a pipe to a pipe block provided with an ep.ner opening, which does not require welding or brazing and the tube against axial movement and rotational movement is mechanically fixed relative to the tube block in a tight relationship relative to the tube block will.

The invention is illustrated below with reference to the drawing, for example described; in this shows:

309849/0933

2325.37a

Fig. 1 is an end view of a device for connecting a Tube with a tube block according to the invention,

Pig. 2 shows a sectional view along line 2 - 2 in FIG. 1,

Mg. 3> 4 · »5 and 6 illustrations of the four successive ones Steps required to manufacture the pipe connector

Fig. 7 is a sectional view of a second embodiment an expanded pipe joint according to the invention, in which the configuration of the on a block pipe attached pipe is illustrated, 'and

Fig. 8 to. 12 successive views of the process steps, the device used to produce the pipe connection shown in FIG. 7.

According to FIGS. 1 and 2, a tube 10 is relatively thin-walled Construction made of a suitable ductile or bendable material, for example aluminum, on a pipe block 12 attached, which also consists of a suitable material, for example aluminum, and a separate element, as shown, it is part of a manifold assembly with a multitude of pipes attached to it can be. The tube 10 is attached to the tube block 12 in a manner to be described below so that it is against an axial movement and a rotational movement relative to the pipe block 12 is fixed or is retained, wherein a sealing ring or a sealing sleeve or a sealing washer 14 is arranged so that there is a seal between the tube 10 and the tube block 12 provides.

According to the drawing, the pipe block 12 is durchge-. existing. Countersunk or counterbore provided, the two

309849/0933

2925373

opposite first and second holes with • different Includes dimensions extending from opposite front and rear surface portions or walls 12 a or 12 b of the Eohrblocks extend and coaxially meet mist a shoulder provided therebetween. !The first Bore forms a cylindrical wall section 1; 6 with a diameter that is significantly larger than the Ifenn outside diameter of the tube 10 is, and this bore extends from the wall 12 a and ends at a radially ' inwardly extending wall 18 which can extend at any suitable angle to the axis of the counterbore and in the The embodiment described is shown at right angles to this, and the second 'bore forms a cylindrical one Wall section 20 with a reduced diameter, which extends from the wall 12 b. The diameter of the cylindrical wall portion 20 is slightly larger than the nominal outer diameter of the pipe 10 to aarin the pipe slidably received during assembly for a purpose to be described below.

The cylindrical vault section 20 also points in the circumferential direction extending, spaced axial slots or notches 22 to radially outwardly extending Anti-twist lock 24- on the outside of the tube 10 in the Take up pipe block 12, whereby the pipe-against rotation

'S

is held relative to the pipe block. In the illustrated In the embodiment, the slots or notches 22 are provided in the form of right-angled indentations or partial grooves, two rows with three bars per row are provided. Ball recesses, long slots, or others not shown Bore recesses can alternatively be used to lock the pipe in the direction of rotation in the pipe block.

The tube 10, which has a suitable desired nominal outer diameter after being inserted into the pipe block

309849/0933

232537a

with an outer annular bead or stepped part 26 on this, which rests against the surface 12 b on one side of the block '12, a section 28 with an enlarged diameter, which rests against the cylindrical wall part 20 of the pipe block and carries the outer anti-twist bolt 24 on it, a second outer ring bead or stepped part 30, the circumference of which contacts the cylinder wall 16, and a cylindrical one free end part 32 provided with the desired diameter, the si.ch away from the surface 12 a of the pipe block extends *

The sealing ring or washer 14, which or which on the outer surface of the portion 28 with enlarged Diameter of the pipe 10 is arranged, is preferably an O-sealing ring, but can be a ring seal of any suitable cross-section made of a compressible material and suitable for this purpose is dimensioned. In addition, the O-ring seal 14 is like used in the illustrated embodiment, a "crush" or "press (jam)" type seal, dgfoei inserting the tube 10 into the tube block 12, this seal is in sealing contact against the surface of one side of the bead 30 and is pressed or wedged against the wall sections 16 and 18 of the pipe block.

In FIGS. 3 to 6, the working steps are illustrated, those for assembling the pipe 10 with the pipe block 12 according to the invention are required, these steps are described below:

According to FIG. 3, the pipe 10 is inserted into the bore of the pipe block 12 and the O-ring seal 14 is inserted over the free end of the pipe and positioned on this in a position in contact against the radial wall 18 in the counterbore in your Tube block 12 moved. In the illustrated embodiment

309849/0933

2325379

the Eohr 10 is fixed relative to the pipe block 12 by a stationary Bückwulst-Press- or Pormeinrichtung 40, which has a bead hollow roughness 42, wherein the. free end portion 32 of the ear 10 extends over a distance X, as shown in Pig. 3 is shown, extends from the front surface 12 a of the Eohrblockes 12 and the * Eohrblock 12 at a distance Y ^: from the Eückwulst-Pornieinrichtung 40 is arranged.

The next one, in Pig. 4, an expanding mandrel 44 of suitable diameter is passed through the step illustrated in FIG Inner diameter of the Eohres 10 from its free end inserted, forcing the pipe material to extrude into the axial slots or notches 22 and the anti-rotation locks 24 to form on the outer circumference of the ear, and at the same time the portion 28 with enlarged Diameter of the ear is formed so that a plague fit between this ear section 28 and the cylindrical wall part 20 of the ear block 12 exi-stiert. According to the drawing is the expanding mandrel 44, which has a tapered head or ball head 46 at its free end, at its opposite end End attached to a mandrel block 48, which can engage the fiohrblock 12 to prevent the penetration of the expander mandrel to limit it 44 in the ear 10. To the same Time is the part of the Eohres 10, which is from the Eückwulst pressing device 40 extends out, and the ear block 12 is forced by the mandrel block 48 to pass through the distance Y to move and the bulge 26 in the cavity 42 of the Eückwulst-Pormeinrichtung to build. Subject of the drawing is an annular cavity 50 in the mandrel block 48 in the area of Base of the expanding mandrel 44 provided to the free end portion 32 of the ear during this work step.

Tray pig. 5 is then a G-rößenfestlegungs-Pormeinrichtung 52 with an annular Pormhohlraum, 5 ^ ^m i 't a desired

309849/09 3 3

Inside diameter used to be the outside diameter of the free End portion of the tube .10 to the correct diameter for the front bead former 56, which is in the final Work step is used.

In the final step illustrated in Fig. 6, a front bead former 56 is used to form the annular To form bead 30 in front of the sealing ring 14 · and to capture it completely in the pipe block 12. Is preferred the front bead former 56 with a support mandrel 58 and an annular cavity 60 of the desired outer diameter or inner diameter is provided around the free end portion 32 of the tube 10 to give the correct dimension in the desired manner, the support mandrel 58 also being used to ensure that the tube does not collapse inwardly during the formation of the bead 30. The depth of the cavity 60 'is provided so that the free end surface of the tube from the front bead former 56 on the bottom wall 62 of the cavity is touched when the front bead former is moved to the right in FIG. 6 to form the bead 30.

Depending on the desired final diameter of the free end portion 32 of the tube, that illustrated in FIG Work step omitted if desired The entire dimensional shaping of the free end part of the tube is carried out in the working step shown in FIG will. Depending on the intended application of the device according to the invention for connecting a pipe ' with a pipe block, the bead 26 can be omitted, since the anti-rotation rule 24- also a certain axial support as also provide a swivel mount between the pipe and the pipe block.

According to FIGS. 7 "to 12, a pipe 10 is in accordance with the invention

309849/0933

Way, attached to a Eohrblock 12, with a 0-input -. seal or a sealing washer 14- is arranged so
that it provides a seal between the pipe 10 and the pipe block 12. The Eohr 10 is preferably made of a thin-walled construction and made of a suitable ductile or deformable material, for example aluminum. The ear block 12 can be made of any suitable material,
as desired, for example of aluminum when used in conjunction with an aluminum pipe, and the pipe block may be a separate element as shown or it may be part of a pipe manifold assembly having a plurality of pipes attached thereto.

According to the drawing, the Eohrblock 12 is provided with a through counterbore or counterbore or stepped bore, which consists of opposing first and second bores of different dimensions. from opposite surface parts or walls 12 a and 12 b of the
Eohrblockes extend from and coaxially meet a shoulder or Eadialwand 16. The first, from the wall 12 a from extending hole has a diameter
which is substantially larger than the nominal outer diameter of the Eohres 10 to a cylindrical wall portion 18 with a
Provide diameter A, as shown in FIG. The second, reduced diameter bore defines a cylindrical wall portion 20 of diameter B, as shown in Pig. 8, which extends from the wall 12b of the ear block, the diameter of the cylindrical wall portion 20 preferably being only slightly larger than the nominal outer diameter of the ear 10 to accommodate the ear therein during the assembly of the ear to the ear block in FIG a manner to be described below in a sliding manner. The shoulder or radial wall 16 extends from the cylindrical wall portion 18 under an appropriate one
Angle to the axis of the counterbore radially inward, this

309849/0933

Angle in the illustrated embodiment is a right Angle is.

The cylindrical wall portion 18 is provided with spaced-apart in the circumferential direction AxaiIschlitzen or notches 22 to accommodate the radially outwardly extending anti-rotation bars, which are subsequently formed on the outside of the ^v Rohres.10, whereby this tube against rotation relative to the tube block is held. The axial slots or notches 22 can be provided in the cylindrical wall section 20 in an alternative manner not shown. In the illustrated embodiment, the slots or notches 22 are in the form of drawn keyways or slots, there being six such slots in the illustrated embodiment. These slots have a suitable axial length, but do not extend over the full axial length of the cylindrical wall section 18, so that a suitable section 18 a without teeth remains therein, which acts as a seating surface for the sealing ring 14. Thus, the first bore in the tube block can be referred to as a partially splined bore. ■

The pipe 10, which has a desired nominal outer diameter, is after insertion into the pipe block 12 with an annular bead or stepped part 26, which against the Surface 12 b of the pipe block 12 applies, a first section 28 with a slightly enlarged ring diameter in the Ifestsitz with the cylinder wall section 20 of the pipe block, a second section 30 with an enlarged ring diameter in an interference fit enlarged with the cylinder wall portion 18 of the tube block, an inclined annular portion 32 between them Sections 28 and 30 and a free end portion 34 · with a desired suitable diameter provided.

309.849 / 0933

The outer surface of the inclined annular portion 32, the radial wall 16 and the section 18 a of the pipe block 12 form an annular sealing ring cavity. ■ with. predetermined dimensions for the sealing ring. or the Sealing washer 14 to achieve the desired compression of the sealing ring . Provide, so that a fluid-tight seal between the tube 10 and the tube block 12 is created. The sealing ring or washer 14, the or the is arranged in this sealing ring cavity is preferably an O-ring seal, but can also be a sealing ring be of any suitable cross-section, - made of compressible Material exists and is suitably dimensioned for the intended purpose.

According to FIGS. 8 to 12, in which the preferred sequence of .Work steps necessary to assemble the tube 10 with the Pipe block 12 are required to form the device shown in Fig. 7, these steps are as follows:

According to Fig. 8, the pipe 10 is inserted into the stepped bore of the pipe block 12, with the O-ring seal 14 over the free end of the tube is positioned and on this in a position in abutment against the radial wall 16 in the counterbore is moved in the pipe block 12. In the illustrated embodiment, the tube 10 is relative to the tube block 12 fixed or held in place by a stationary bulge former 40 with a bead cavity 42, wherein the free end portion 34- des.Rohres 10 over a distance X, as it. is shown in this figure, from the 'front surface 12 a of the tube block extends from and the tube block 12 is disposed at a distance Y from the bulge former 40.

In the next step, which is illustrated in FIG. 9, an expanding mandrel 44 through the inside diameter of the tube

3.09849 / 0933

* 10 inserted from its free end, with the material is forced to extrude into the axial slots or notches-22 and the anti-twist locks 24 on the outer circumference of the pipe to form, and at the same time making the sections 28 and 30 with enlarged diameter and the inclined annular portion 32 formed between them will; while the portions 28 and 30 are shaped with an enlarged diameter so that they have an interference fit between the The drilling material of these sections and the cylindrical wall sections 20 and 18, respectively, form.

Tray pig. 9, the expanding mandrel 44 has a ball nose 48 a at its free end, a section 48 b with a first diameter and a section 48 d with a second diameter with an inclined shoulder part 48 c in between, the second diameter portion 48d at its base on a mandrel block 46 as shown is fixedly attached or formed integrally with this. The diameter of the sections 48 b and 48 d with the first or the second diameter and their lengths as well as the length and the angle of the inclined shoulder section 48 c are chosen so that the desired interference fit between the pipe material and the pipe block material is obtained, the shape and the dimensions of the sealing ring cavity by the inclined shoulder portion 48 c and the penetration depth of the expanding mandrel to be determined in the pipe; the penetration depth is in the illustrated embodiment by attacking the Controlled area of the mandrel block 46 on the tube block. With this arrangement to form the inclined annular portion 32 of the tube relative to the radial wall 16 and the cylindrical wall portion 18 can be a specific predetermined compression of the O-ring seal 14 can be obtained. The mandrel block 46 is provided with an annular cavity, the base of the portion 48 d with the second Surrounding diameter of the expanding mandrel to the free end portion of the pipe extending from the surface 12 a of the pipe block

309849/0933

from extends to include during this step.

According to FIG. 9, if the expanding mandrel 44 with the mandrel block 46 is moved from left to right in this figure, the Tube 10 is extruded in the manner described and enlarged and touched when the expanding mandrel 44 is in the tube and in the · Block counterbore abuts the ground, the surface 46 a of the mandrel block the Rohrbloek 12 and forces it to move through the to move the above-explained distance Y to the right in FIG. 9 against the bulge forming device 40 and thereby the annular bulge 26 in the cavity 42 in the bulging back forming device 40 to form. '

10 and 11, one or more G-size-measuring molding devices 50 and 50 a _5, each of which has annular mold cavities 52 and 52 a, are then used to adjust the outside diameter of the free end portion of the pipe to a desired predetermined value To contract the outer diameter. , "

In the final work step illustrated in FIG becomes a sizing forming device 54- mi ^ a mandrel 56, which may be an expanding mandrel, and with a ring-like mold cavity 58 with the desired inner diameter, Outer diameter and desired depth used, the free end portion 34 · of the tube with a desired particular configuration of the inside diameter and the outside diameter. .

Depending on the final diameter desired of the free end portion 34- of the tube 10 can be one of the two working steps illustrated in FIGS. 10 and 11 or these two working steps can be eliminated, whereby the entire size formation of the free Encbeiles des

309849/0933

Tube is carried out in the work step illustrated in Fig. Λ2 ■. In addition, the working step shown in FIG. 12 can also "be omitted if a resizing of the free end of the pipe is not desired. Depending on the intended application of the device according to the invention for connecting a pipe to a pipe block, the bead 26 can be omitted," since the anti-rotation bolts 24 also provide a certain axial securing as well as a rotational safeguard between the tube and the tube block ".

3 0 9849/0933

Claims (6)

Godparents fb an sayings Fluid-tight Üohrverbindungseinrichtung, thereby g e mark h η e t that a pipe block (12) with a circular stepped opening is provided by two coaxial ^ cylindrical wall sections with different diameter is formed, which is from the assigned opposite sides (12 a, 12 b) of the block and meet at an intermediate shoulder with one of the wall sections being keyed (22) has that a tube (10) extends through the stepped opening extends and two annular extensions (30, 28) having different diameters that have a Firmly fit each with one of the two wall sections of the stepped opening form, τι / obei one of the extensions (28, Fig. 1-6; 30, Fig. 7-12) with the keyways (22) in Engages, and that one of the extensions (30, Fig. 1-6, 30/32, Fig. 7-12) of the tube with the shoulder (18, Fig. 1-6: 16, Fig. 7-12) and the wall portion of the block with the larger diameter an annular cavity for receiving a sealing ring (14 ·) surrounding the pipe. 2. Device according to claim 1, characterized in that net that the keyways (22) are directed axially. 309849/0933 Dr. Müller-Bore 33 Braunschweig, Am Bürgerpark β Telephone (0531) 73887 Dr. Mtnltz Dr. Deufal Dipl.-Ing. Finiterwald 8 Munich 22, Rbbert-Koch-StraUe 1 Telephone (0811) 283845, Telex 5-22050 mbpat Bank: Zentralkau · Bayer. Volksbankan, Munich, account number se22 Poeticheck: Manchen 95486 Dipl.-Ing. Grimkov 7 Stuttgart'Bad Cannttatt, MarktatraB 3 Telephone (0711) 587281 3. Device according to claim 1 and 2, characterized in that the tube has a third annular Extension (26) in contact with the side (i2 b) of the block which is opposite to the side (12 a), from which the wall section with a larger Diameter of the stepped opening occurs. 4. Device according to claim 3 _? thereby geke η η show η et that the extension (30, Fig. 1-6; 32, S ¹ Ig. 7-12) of the pipe, which closes the sealing ring cavity ^, and the third extension (26) is annular Bulges are. 5. A method for producing a fluid-tight pipe connection device, thereby gekerinz ei chnet that a circular stepped opening (Fig. 7-12) is made in a pipe block (12), which is formed by two coaxial cylindrical wall sections with different diameters, which meet at an intermediate radial shoulder, the larger of the wall from sections with keyways is provided that a tube (10) is fixed in the opening, and an O-ring (14) is arranged around the tube and positioned against the radial wall that a stepped mandrel (44) with two sections (48b, 48d) with different diameters, which are connected by an inclined shoulder (48c), is inserted into the tube, so that the tube is expanded and thereby two annular extensions ( 30, 28) are formed with different diameters, each of which engages one of the wall sections (22, - 20) of the block opening and of which an extension (30) with engages the keyways (22) and that the mandrel is inserted in such a way that the inclined shoulder (48c) of the mandrel forms an inclined annular portion (32) on the tube, 309849/0933 the one with the larger section (18) and the radial one Shoulder (16) of the stepped opening an O-Bing (14) forming the receiving cavity. 6. The method according to claim 5 _5, characterized eichn et that on the drill (S ¹ Ig. 7-12) an annular bead (26) is formed which rests against the side (12b) of the block from which it is the smaller diameter portion of the stepped opening extends inward. 309849/0933