Fitting for connection to at least one pipe

Abstract

A metallic connection with a metal pipe, with a base body made of metal, with at least one supporting body made of metal and formed in one piece with the base body for insertion into a pipe end and with at least one pressing sleeve made of metal and connected to the base body for receiving the pipe end, the supporting body and the pressing sleeve being designed for radial pressing, the supporting body having a first sealing section arranged at the distal end with at least one radially encircling sealing tooth has a holding region adjoining the first sealing section in the axial direction, holding teeth which are distributed around the circumference and extend axially, and a second sealing section adjoining the holding region in the axial direction and having at least one radially extending sealing tooth.

Claims

1. A fitting for a metallic connection with a metal pipe, with a basic body made of metal, comprising: at least one supporting body made of metal and formed in one piece with the basic body for insertion into a pipe end, and with at least one pressing sleeve connected to the basic body and made of metal for receiving the pipe end, wherein the support body and the pressing sleeve are designed for radial pressing, wherein, the supporting body comprises: a first sealing section arranged at the distal end and having at least one radially encircling sealing tooth, a retaining region adjoining the first sealing section in the axial direction and having retaining teeth distributed around the circumference and extending axially, a second sealing section adjoining the retaining region in the axial direction with at least one radially circumferential and radially outwardly projecting sealing tooth, and wherein only a metallic seal is formed between the supporting body and the pressing sleeve with a metal pipe.

2. The fitting according to claim 1, wherein the first sealing section and the second sealing section each have two spaced peripheral sealing teeth.

3. The fitting according to claim 1, wherein the retaining region has at least 10-axially extending holding teeth.

4. The fitting according to claim 1, wherein the at least one pressing sleeve has a cylindrical inner contour and a sectionally cylindrical outer contour, wherein a first portion is formed centrally in the axial direction, a second portion is formed adjacent in the distal direction, and a third portion is formed adjacent opposite to the distal direction, wherein the material thickness of the centrally arranged section is greater than the material thickness of the second portion and the third portion.

5. The fitting according to claim 1, wherein that the metal of the supporting body has a greater hardness than the metal of the pressing sleeve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, the invention is explained by means of preferred embodiments with reference to the drawing. The drawing show

(2) FIG. 1 a first embodiment of a fitting with inserted pipe in longitudinal section,

(3) FIG. 2 the basic body with supporting body of the first embodiment in longitudinal section,

(4) FIG. 3 the basic body with supporting body of the first embodiment in a perspective view,

(5) FIG. 4 the basic body with support body of the first embodiment in cross-section,

(6) FIG. 5 the press sleeve of the first embodiment in longitudinal section,

(7) FIG. 6 the press sleeve of the first embodiment in a perspective view,

(8) FIG. 7 a basic body with supporting body of a second embodiment of a fitting in longitudinal section and

(9) FIG. 8 the basic body of the second embodiment in a perspective view.

DESCRIPTION OF THE INVENTION

(10) In the following description of the various embodiments in accordance with the invention, components and elements with the same function and the same mode of operation are given the same reference signs, even though the components and elements may differ in dimension or shape in the various embodiments.

(11) FIGS. 1 to 6 show a first embodiment of a fitting 2 for making a metallic connection with a metal pipe 4. The fitting 2 has a basic body 6 made of metal and at least one supporting body 8 for insertion into a pipe end 10 of the metal pipe 4, which is made of metal and is formed in one piece with the basic body 6. Furthermore, at least one press sleeve 12 connected to the basic body 6 and consisting of metal for receiving the pipe end 10 is connected to the basic body 6 by means of a mechanical connection 14 consisting of a web 16 formed on the basic body 6 and an inwardly directed collar 18 formed on the press sleeve 12, which embraces the web 16.

(12) The support body 8 and the pressing sleeve 12 are designed for radial pressing, i.e. they can be pressed by a pressing force directed essentially radially inwards. For this purpose, FIG. 1, right-hand side, shows a pressing tool 20 attached to the pressing sleeve 12 from below, the counterpart of which has been omitted on the upper side of the pressing sleeve for better clarity.

(13) According to the invention, the support body 8 has the following elements. A first sealing section 22 is arranged at the distal end of the support body 8, which in the present embodiment has two radially circumferential sealing teeth 24. Furthermore, a retaining area 26 is arranged which is connected to the first sealing section 22 in the axial direction and has retaining teeth 28 which are distributed around the circumference and extend axially. The number of retaining teeth 28 is 16 in the embodiment shown. Furthermore, the supporting body 12 has a second sealing section 30 which adjoins the retaining section 26 in the axial direction and which also has two radial circumferential sealing teeth 32 in the embodiment shown.

(14) As can be seen in FIG. 1 and FIGS. 5 and 6, the press sleeve 12 has an essentially cylindrical inner contour 34 and a sectionally cylindrical outer contour 36. A first section 38 arranged centrally in the axial direction, a second section 40 adjacent in the distal direction and a third section 42 adjacent in the opposite direction are formed, the material thickness of the centrally arranged section 38 being greater than the material thickness of the adjacent sections 40 and 42.

(15) FIG. 1 shows a fitting 2 with two supporting bodies 8 and two press sleeves 12, whereby the fitting 2 is unpressed on the left side and pressed on the right side.

(16) In the unpressed state the pipe end 10 can be inserted and positioned between the outer contour of the support body 8 and the inside of the pressing sleeve 12. In the embodiment shown, the pipe end 10 is widened compared to the rest of the metal pipe 4, so that the inner diameter of the metal pipe 4 and the inner diameter of the support body 8 and thus of the basic body 6 are essentially the same size, so that no reduction of the flow cross-section is produced by the fitting 2 even in the pressed state.

(17) The right side of FIG. 1 shows the fitting 2 in the pressed state, for illustration purposes a part of a pressing tool in the form of a pressing jaw 20 is shown on the underside of the pressing sleeve 12. The inner contour of the press jaw 20 has a projection 50 at each of the axially distal ends, which presses the pipe end 10 together with the press sleeve 12 onto the two circumferential sealing teeth 24 or 32 in such a way that a tight metallic connection is created between the outside of the support body 8 and the inside of the pipe end 10 at both sealing sections 22 and 30. FIG. 1 shows a detail of the metallic connection at the sealing teeth 24 in an enlargement.

(18) The centrally arranged holding area 38 of the press sleeve 12 has been pressed inwards by the press jaw 20, so that the pipe end 10 in this section has been pressed onto the holding teeth 28 of the holding area 26. This secures the press sleeve 12 and the pipe end 10 against torsional moments and gravity forces and prevents or largely prevents unintentional twisting of the pressed connection.

(19) FIGS. 7 and 8 show a fitting 2 of a second embodiment, in which the support body 8 has only one sealing tooth 24 and 32 in both sealing sections 22 and 30. The press sleeve 12 is unchanged from the first embodiment. This fitting also results in a tight and stable metallic connection between the pipe end 10 and the support body 8.

(20) In order to achieve a reliable metallic tight connection, it is intended that the metal of the supporting body 8 has a greater hardness than the metal of the pressing sleeve 12. Thus, the pressing sleeve 12 can be plastically deformed during pressing, while the support body 8 retains its shape to a large extent or completely.