DE19752528A1 - Plug and socket type tube connector, esp. for plastic tubes, - Google Patents

Abstract

A plug and socket type tube connector (50.1), esp. for plastic tubes, has a two part connecting piece (30.1) with an external thread (32) onto which a screw-on housing (1) with an internal thread (36) is screwed. A first set of seals (11,12,13) on the housing (1) seals between the outer wall of the tube (4) and the inner wall of the housing (1) and a second sealing arrangement (10) seals the outer wall of the connector (30.1) with the inner wall of the screw-on housing (1). The connector part (30.1) includes both an existing conical connector piece (15) with an internal conical surface (38) and an external thread (32) and also a separate sealing and holding adaptor (2) with an external conical surface (7), an annular seal (8) and an annular sealing and holding groove (5) with an engaging lip (6) in front on the outside. An annular chamber (34) in the adaptor (2) receives the inserted tube end (4). Assembly is effected by inserting the adaptor piece (2) into the screw-on housing (1) and holding together using the second seal (10) which engages with the holding groove (5). The screw-on housing (1) with inserted adaptor (2) is then screwed onto the conical connector piece (15). In a design variation the connector piece forms a screw-in connector with an additional external thread and has a similar sealing and holding groove (5) with engaging lip (6) as the adaptor (2) in the first design for gripping the second sealing system (10) when the housing (1) is screwed on.

Description

TECHNICAL AREA

The present invention relates to a connecting device device for plastic pipelines, with a connecting device tion with a first external thread and an annular space into which a pipe end from the outside until it touches a stop is pluggable, a screw-on housing with an internal thread for screwing onto the first external thread of the connection direction, first sealant, for sealing between the Outer wall of the tube and the inner wall of the screw housing and second sealant for sealing the outer wall the connection device with the inner wall of the screw-on house.

Such devices, often referred to as plug-in connections in particular in the area of air brake systems built-in. Here, these devices must have pressures of up to endure up to 20 bar (including safety surcharge). This ensures a permanently reliable seal and simple che connectivity sought.

Such connectors are also for example Connection of pressure lines to pressure vessels or Ventilge housing used. The connector with arranged in it Support sleeve is usually screwed to a connector and then the pipe is inserted into the junction box plugged. This enables a very simple pipe plug Enough.  

STATE OF THE ART

A connection fitting is known in which a tapered pin is loosely inserted in a connector and when ver screw the connector with the connector in axial direction is fixed, the reaction force of the Thread preload is transmitted via the taper pin. For The screw connection is sealed with a soft seal, between the face of the connector and through the connection element and the tapered contact surface Chen is arranged. In addition, a support sleeve is in front act that the tube end when inserting into the connecting arm door leads. With this connection fitting, the clamping is the Soft seal from the manufacturing tolerances of the connection connecting piece, the taper and the components of the connecting element ment dependent, since the distance between the face and of the contact surfaces determined by the dimensions of these parts becomes. The soft seal is also supported the threads of the internal thread and the external thread, which may Leaks can result. Such Connection fitting is only for connection to a so-called. Cone connection, which is normally standardized, is suitable.

A generic connection fitting for plastic pipes is characterized in that a taper on a sleeve is attached, which is sealed against a mounting hole tet and is fixed in a connection element such that when Unscrew the connecting element from the connecting piece Transfer axial movement of the internal thread to the taper pin gene and that the taper in a recess Seals the ring that can be pressed against the wall of the tapered bore is. The sleeve is captive with the connection ment connected. This connection fitting is only for this purpose suitable to connect to the known cone connection to deliver.  

PRESENTATION OF THE INVENTION

The present invention is based on the above State of the art, the task or the technical problem based on a connector plug available ask which variable application possibilities under allows different types of connections, but one permanent functional reliability, economical use guaranteed and constructive simplicity and also the use of conventionally standardized connecting pieces enables.

The connector device according to the invention is by the Features of independent claim 1 given. Beneficial Refinements and developments are the subject of dependent claims.

The connector device of the invention is characterized in that the Connection device as a known Konusan closing unit with internal cone and the first external thread and designed as a separate sealing and holder adapter unit is, the adapter unit has a corresponding outer cone with sealants and on the outside a sealing and Holding groove with upstream against the connection direction Has grid lip, such that the adapter unit sealing can be releasably inserted into the screw-on housing by when inserting the second sealant releasably into the Snap the sealing and retaining groove into place, and the screw-on housing with inserted adapter unit sealingly releasable on the cone can be screwed on, or the connection set up as a screw-in housing with a further external ge winch is formed and on the outside a sealing and holding only with the grid in the opposite direction lip has, such that the second sealant at up  screwed screw-on housing in the sealing and removable Snap the groove into place.

In a first preferred embodiment, the Annular space in the adapter unit is designed as an annular bore.

Another preferred embodiment with regard to the two This distinguishes ten alternative connection options that the annular space in the screw-in housing by a Blind hole and a support arranged in the hole sleeve with reduced through-hole compared to the blind hole knife is formed.

One particularly cheap in terms of production and one embodiment ensuring permanent functionality is characterized in that the storage of the support sleeve in trained the blind hole as a fit or press fit det.

A particularly advantageous development of the invention according connector for pipes stands out characterized in that the sealing and holding groove with against the Connection direction upstream grid lip in the open end rich of the annulus is present on the outside.

According to the invention, the connector device can be detachable Combination plug device on the one hand in a variant as an open screw connector or in a variant as screw-in connector are used. To implement this com combination only three components are required, namely the screw-on housing, the sealing and holding adapter and that Screw-in housing. The connector is in both versions via the grid lip in cooperation with the sealing and retaining groove detachable. The sealing and retaining ring takes care of the screw-on version, d. H. in connection with the sealing and  Holding adapter, both the sealing function and the holding function for the sealing and holding adapter. When screwing in The sealing and retaining ring takes over the sealing connection function for screw-on housing.

Preferred is the material for the existing components Brass used.

Further embodiments and advantages of the invention result themselves by the features listed in the claims and by the exemplary embodiments specified below. The features of the claims can be in any way can be combined as far as they are not open visually exclude each other.

BRIEF DESCRIPTION OF THE DRAWING

The invention and advantageous embodiments and Wei In the following, further developments of the same are based on that in the Drawing illustrated examples described and he purifies. The can be found in the description and the drawing the features can be used individually or in groups arbitrary combination can be applied according to the invention. It demonstrate:

Fig. 1 shows a schematic exploded view of a terminal plug-in device designed as a cone with Aufschraubverbindung terminal, a sealing and Halteadap ter and a Aufschraubgehäuse, wherein above the line system is a sectional view and below the line system is a view representation is selected,

Fig. 2 shows a schematic representation of the apparatus according to Fig. 1 in a connected state,

Fig. 3 is a schematic exploded view of a connector device, designed as a screw-in connection with a screw-in housing and a screw-on housing, a longitudinal section above the system line and a view below the system line being selected and

Fig. 4 is a schematic representation of the connector device of FIG. 3 in the connected state.

WAYS OF CARRYING OUT THE INVENTION

In Fig. 1, a connector 50.1 for a pipe 4 is shown in an exploded state, which consists of a two-part connection unit 30.1 and a screw-on housing 1 . The connection direction is shown schematically in the figures by an arrow A.

The connection device 30.1 consists of a standardized DIN 24 ° cone connection unit 15 which has a first external thread 32 and an inner cone 38 in the front area facing the screw-on housing 1 , which widens in the opposite direction to the connection A. The second component of the device 30.1 is a sealing and holding adapter 23 which can be detachably latched into the interior of the screw-on housing 1 .

The adapter 2 has an open annular space 34 , seen from the connection direction A, which is formed by an annular bore. On the inside of the annular space 34 there is a hollow support sleeve 9 , the diameter of which is slightly smaller than the diameter of the tube 4 . The annular space 34 has in its bottom area a pipe stop 14 up to which the pipe 4 can be inserted into the annular space 34 in the connecting direction in the connected state.

On the outside, a raster lip 6 is formed on the adapter 2 from the open end region of the annular space 34 , which follows a sealing and holding groove 5 as seen in the connection direction A. In the further course in connection direction A, the outer contour of the adapter 2 is designed as an outer cone 7 , specifically in connection direction A with a decreasing diameter, such that the outer cone 7 of the adapter 2 comes into contact with the inner cone 38 of the cone unit 15 in the closed state. Finally, a groove 42 is also present in the outer surface of the outer cone 7 , within which a cone ring 8 is arranged for sealing purposes.

On the right front edge area, the screw-on housing 1 has a pipe guide bore 19 , the inside diameter of which is only slightly larger than the outside diameter of the pipe 4 .

The screw-on housing 1 has on the inside in connection direction A seen from the right first a step groove 44 , within which first a sealing and dirt ring 13 with a relatively large diameter and then immediately a sealing ring 12 with a smaller diameter is arranged.

In the further course seen in connection direction A, the inner wall of the connection housing 1 has conically widening clamping surfaces 17 . In this conical clamping surface area 17 , a cutting ring 3 with cutting teeth 16 is arranged, the task of which is to secure the pipe in the connected state against being pulled out. This is ensured by the fact that the cutting ring 3 is slotted and lies movably in the screw-on housing 1 . By inserting the plastic tube 4 , the cutting ring then expands. After reaching the insertion depth on the pipe stop 14, the cutting teeth 16 clamp the plastic pipe. When pressure loading or by pulling on the tube, the cutting ring 3 is clamped over the conical clamping surfaces 17 , the cutting teeth 16 cut into the outer wall of the tube 4 and secure its position.

Directly after the cutting ring 30 is seen in the connection direction A, another groove 46 inside, in which a further sealing ring 11 is arranged.

In the further course of the inner wall of the screw-on housing 1 in the connection direction A, a sealing and holding ring 10 is arranged at a distance from the sealing ring 11 in a further groove 48 , this sealing and holding ring 10 when the sealing and holding adapter 2 is inserted into the screw-on housing 1 the grid lip 6 slides away and releasably engages in the sealing and holding groove 5 of the adapter 2 .

Finally, in the further course of the inner wall of the screw-on housing 1 there is an internal thread 36 which can be screwed onto the external thread 32 of the cone connection unit 15 . Between the sealing and retaining ring 10 and the internal thread 36 there is also a radially extending inner stop surface 20 which comes to a stop with a corresponding counter stop surface 49 on the sealing and holding adapter 2 when the screw-on screw-on housing 1 is screwed on.

On the outside, the screw-on housing 1 has a hexagonal contour 47 at the level of the internal thread 36 , so that a tool can be used for screwing on in a simple manner.

As already mentioned, the sealing and holding adapter 2 is first inserted into the interior of the screw housing 1 when the connection is being made and is releasable within the screw housing 1 by snapping the sealing and holding ring 10 together with the inner stop surface 20 and the counter stop surface 49 locked in position and a tight connection between the inner wall of the Aufschraubgehäu ses 1 and the outer wall of the adapter 2 achieved. In this state, the screw-on housing 1 with the sealing and holding adapter 2 is screwed onto the cone connection unit 15 . The conical outer contour 7 of the sealing and holding adapter 2 is pressed into the inner cone 38 of the cone connection unit 15 , the tightness being ensured by pressing the conical ring 8 together .

If the screw-on housing 1 is screwed onto the cone connection unit 15 , the pipe 4 can be connected in connection direction A in a simple manner. For this purpose, the pipe 4 is inserted through the pipe guide bore 19 into the interior of the screw-on housing 10 . The tube 4 is guided further over the support sleeve 9 , penetrates into the annular space 34 up to the tube stop 14 . The rings 11 , 12 , 13 seal against the outer contour of the tube 4 . The cutting ring 3 with its cutting teeth 16 secures the tube 4 against being pulled out.

In the illustrated version, the Aufschraubgehäuse 1 can be for a Aufschraubsteckverbindung in connection with the sealing and holding adapter 2 is used. The plug connection can be released via the grid lip 6 in cooperation with the sealing and holding groove 5 . In this screw-on version, the sealing and holding ring 10 takes on both the sealing function and the holding function for the sealing and holding adapter 2 .

In FIG. 3, the second version is shown how the same Aufschraubgehäuse 1 can be used for a Einschraubsteckverbindung with a screw-21st

The screw-on housing 1 is identical to the Aufschraubge housing 1 of FIGS . 1 and 2. The same components have the same reference numerals and will not be explained again.

The connection device 50.2 according to FIGS. 3 and 4 has, as already mentioned, the screw-on housing 1 and a connection device 30.1 which is formed as a screw-in housing 21 . Seen in connection direction A, the screw housing 21 initially has essentially the same outer contours as the adapter unit 2 according to FIG. 1. An annular space 34 is also present here, this annular space 34 being formed in that the screw-in housing initially has a blind hole, into which a hollow support sleeve 23 is inserted up to a stop 27 . From this stop 27 , the stepped bore is designed as a press fit bearing for the support sleeve 23 .

Just like the sealing and holding adapter 2 , the screw housing 21 seen from the open end of the annular space 34 in the connection direction A on the outside first has a grid lip 6 with an adjoining sealing and holding groove 5 . Seen in the further course in connection direction A, the outer contour of the screw-in housing 21 has a first external thread 32 , which is designed such that the internal thread 36 of the screw-on housing 1 can be screwed on. In another Ver running the outer contour in connection direction A of the A has screw housing 21 has a protruding hexagonal contour 31 and subsequently a further external thread 40 over which the screw-in housing 21 can be connected to a not shown internal thread of a pressure vessel.

For sealing purposes, the left end face in FIG. 3 of the protruding hexagon cone has an annular screw-in device 22 . On the opposite of the connection direction A opposite end of the protruding hexagon 31 , a stop surface 28 is present, the surface 24 comes in contact with the screwed on screw housing 1 with the left end face outer stop 24 of the screw housing 1 .

The sealing and locking function related. Of the tube 4 employed is stet ensu when screwed onto the screw-in housing 21 Aufschraubgehäuse 1 in the same manner as in the embodiment according to FIGS. 1 and 2. Also in this type of connection, the connector on the Raster lip 6 in cooperation with the sealing and holding groove 5 releasable. In the screw-in connector solution shown, the sealing and retaining ring 10 takes on the sealing function of the screw-in housing 21 . According to the invention it is thus possible, please include, one and the same Aufschraubgehäuse 1 for an on schraubsteckverbindung in conjunction with a sealing and holding adapter 2 as well as for a Einschraubsteckverbindung with screw-21 insert. The connector is detachable in both versions.

Claims (7)

1. connector ( 50.1 , 50.2 ) for pipes ( 4 ), in particular plastic pipes, with

• - A connection device ( 30.1 , 30.2 ) with
  • - A first external thread ( 32 ) and
  • - an annular space ( 34 ) into which a pipe end can be inserted from the outside until it abuts a stop ( 14 , 25 ),
• - A screw-on housing ( 1 ) with
  • - an internal thread ( 36 ) for screwing onto the first external thread ( 32 ) of the connection device ( 30.1 , 30.2 ),
  • - First sealing means ( 11 , 12 , 13 ) for sealing between the outer wall of the tube ( 4 ) and the inner wall of the screw-on housing ( 1 ) and
  • - second sealing means ( 10 ) for sealing the outer wall of the connection device ( 30.1 , 30.2 ) with the inner wall of the screw-on housing ( 1 ),
  characterized in that the connection device ( 30.1 ) is designed as a known cone connection unit ( 15 ) with an inner cone ( 38 ) and the first external thread ( 32 ) and as a separate sealing and holder adapter unit ( 2 ), the adapter unit ( 2 ) has a corresponding outer cone ( 7 ) with sealing means ( 8 ) and has a sealing and holding groove ( 5 ) on the outside with a raster lip ( 6 ) pre-mounted against the connection direction (A), such that the adapter unit ( 2 ) is sealingly detachable in the screw-on housing ( 1 ) can be used by releasably engaging the second sealant ( 10 ) in the sealing and retaining groove ( 5 ) during the insertion process, and the screw-on housing ( 1 ) with a set adapter unit ( 2 ) sealingly releasably on the con usable connection unit ( 15 ) can be screwed on, or - the connection device ( 30.2 ) is designed as a screw-in housing ( 21 ) with a further external thread ( 40 ) and on the outside eitig a sealing and retaining groove (5) opposite to the mounting direction (A) upstream grid lip (6), such that the second sealing means (10) engage in screwed Aufschraubgehäuse (1) is sealingly detachably in the sealing and retaining groove (5) .

2. Device according to claim 1, characterized in that the annular space ( 32 ) in the adapter unit ( 2 ) is designed as a ring bore. 3. Apparatus according to claim 1, characterized in that the annular space ( 34 ) in the screw-in housing ( 21 ) is formed by a blind hole and a support sleeve ( 23 ) arranged in the blind hole with a reduced diameter. 4. The device according to claim 3, characterized in that the mounting of the support sleeve ( 23 ) in the blind hole is designed as a fitting or press-fit mounting. 5. The device according to one or more of the preceding claims, characterized in that the sealing and holding groove ( 5 ) with against the connection direction (A) upstream grid lip ( 6 ) in the open end region of the annular space ( 34 ) is present on the outside. 6. The device according to claim 2, characterized in that a support sleeve ( 9 ) is then present on the annular space ( 34 ). 7. The device according to claim 3 and / or 4, characterized in that the blind hole is formed as a stepped bore with a stop surface ( 27 ).