DE10035791A1 - Push plug for fast and detachable connection of pressure medium pipelines - Google Patents

Abstract

The connector comprises a body (4) for connecting pressure medium pipelines (2) which has an insertion opening (6) and a fixed inner sleeve (8) for gripping in the pipe end (2a). A gripping element (12) lies in the insertion opening and is axially movable, for holding the pipe with an inner conical surface or resting step of the housing working together to fix the holding edge (16) against the outer edge of the pipe.

Description

The present invention relates to a plug-in fitting for the detachable connection of a Pressure medium line, consisting of a housing body with a Receiving opening for inserting one end of the line and with one in Housing body in a coaxially extending within the receiving opening Arrangement attached inner sleeve for engaging in the inserted Line end, with a clamping element axially in the receiving opening is slidably mounted for holding the line with an inner cone surface of the housing body cooperates and thereby radially inwards at least one retaining edge positively or positively against the The outer circumference of the line acts.

Such a plug-in fitting for pipe and / or hose lines with a smoother The outer peripheral surface is known from EP 0 247 214 B1. To seal the Line connection is provided that the sleeve-shaped, chuck-like Clamping element at its end facing the insertion opening radially outwards against the wall of the housing receiving opening and radially inwards the line is sealed with a sealing ring. These are sealing rings thereby integrally connected to the tensioning element. The one Snap connection held in the housing body reaches for the radial Support the line in this with circumferential play, because its outer diameter should be slightly smaller than the inside diameter of the line. This Plug-in fittings have proven themselves to be essentially good, however, above all, the  Gaskets connected to the clamping element to form a complex production.

A similar line coupling is known from EP 0 373 272 B1 (in particular FIG. 9), but it is also quite complex to manufacture, since it consists of numerous individual parts. Two sealing rings are provided for sealing, which act on the outer circumference of the inserted line. In other embodiments, the inner sleeve engages with a plurality of ring edges in the line. This ensures the mechanical retention of the line; a tensioning element acting in the generic sense on the outer circumference of the line is not provided here.

Furthermore, a similar connector has already been proposed, in which the Inner sleeve sealingly engages in the line with an annular bead. It is provided, however, that to release or release the line displaceable clamping element and the inner sleeve with the annular bead in such a way are adapted to each other and interact so that the shifts of the clamping element of the ring bead for sealing engagement in the line or is released or released from the inside of the line. This However, the measure requires mobility and, at least in part, one axial slitting of the inner sleeve, which means that the ring bead is not used alone Sealing is sufficient. Rather, in addition between the clamping element and the housing body, a seal must be present, the axial relative movements must allow. Thus, it is also a constructive and manufac- turer lungs-consuming execution.

The present invention has for its object a plug-in fitting to create the generic type described above, which is simple  and inexpensive construction and manufacturability.

According to the invention this is achieved in that the inner sleeve over Connection means is attached circumferentially media-tight in the housing body and preferably with sealants circumferentially media-tight in the line intervenes. According to the invention is thus solely by the sealing engagement of the essentially rigidly held inner sleeve in the line a media-tight Sealing to the outside is guaranteed because the inner sleeve itself is also tight is connected to the housing body. There are special lanyards for this provided that realized in different forms very easily and inexpensively can be. Some advantageous embodiments for this will follow in the following which will be described later.

The inner sleeve preferably has as a sealant on its outer circumference at least one sealing ring bead. In this area and in the axial area between the sealing ring bead and the sealing connection of the inner sleeve with the housing body, the inner sleeve is essentially rigid and consistent closed, d. H. without axial / radial wall openings, formed, whereby a sealing pipe connection without additional, for example on the outside scope of the line acting seals is guaranteed. According to the invention the sealing ring bead with respect to its outer diameter to the Adjusted inner cross-section of the line that the line non-positively on the In NEN sleeve can be plugged on or removed from this again plugged-in state by frictional support of the cable on the Sealing ring bead an internal seal is guaranteed. So the line advantageously inserted quickly and easily and also through again at any time can be easily removed after the tensioning element has been inserted into the The outer circumference of the line releasing position has been brought.  

Further advantageous design features of the invention are in the Subclaims and the following description included.

Based on several preferred shown in the drawings The invention is intended to provide exemplary embodiments and certain design variants are now explained in more detail. Show:

Fig. 1 shows an axial section of a first embodiment of a plug assembly of the invention in the inserted and locked state of a line,

Fig. 2 shows another embodiment of the plug-in fitting also in axial section, but without showing the clamping element and a line,

Fig. 3 is a representation as in Fig. 2 of another embodiment,

Fig. 4 is a view as in FIG. 1 of another embodiment,

Fig. 5 is a sectional view of a channel connector, especially to herein as T-connector, formed push-in fitting,

FIGS. 6 to FIG. 8 further advantageous embodiment variants of the plug-in fitting,

Fig. 9 shows another embodiment in axial section analogous to Fig. 1 with an alternative for the type of connecting means of the inner sleeve and

FIG. 10 is an advantageous development of the plug-in fitting.

In the different figures of the drawing, the same parts are always with the provided with the same reference numerals and are therefore usually only once described.

As can be seen initially in FIGS. 1 to 4, is a plug valve 1 of the invention for the rapid and releasable connection (at least) a pressure medium line 2 (pipe or tubing). The plug-in fitting 1 consists of a housing body 4 with (at least) one receiving opening 6 (see FIGS. 2, 3) and of an inner sleeve 8 which is fastened in the housing body 4 on the side opposite the mouth side of the receiving opening 6 in such a way that it is located extends coaxially through the receiving opening 6 in order to engage for radial support in the inserted line 2 or in the end 2 a thereof ( FIGS. 1 and 4).

The inner sleeve 8 engaging in the line 2 forms a through channel 10 for a pressure medium passed through the line 2 , in particular compressed air in pneumatic systems. Consequently, the inner sleeve 8 has openings 8 a and 8 b at both ends, one opening 8 a in the line 2 and the other opening 8 b in the fastening region of the inner sleeve 8 in the housing body 4 .

For mechanical mounting of the inserted line 2 , a sleeve-shaped clamping element 12 , which surrounds the inserted line 6, is axially displaceably mounted in the manner of a collet or a chuck within the receiving opening 6 such that it cooperates with an inner conical surface 14 of the housing body 4 to hold the line 2 and thereby acts radially inwards with at least one retaining edge 16 in a form-fitting or at least force-fitting manner against the outer circumference of the line 2 . For this purpose, the clamping element 12 is designed to be radially resilient through at least one axial slot. The clamping element 12 can consist of plastic or metal. By the clamping element 12 protruding outward from the receiving opening 6 with an actuating section 18 , it can be manually moved away from the inner conical surface 14 to release the line 6 , so that the holding edge 16 releases the line 2 by radial widening.

According to the invention, the inner sleeve 8 is rigidly fixed in the housing body 4 by means of special connecting means 20 and is media-tight in the circumference. Furthermore, according to the invention, the inner sleeve 8 engages with the sealing means 22 in a circumferentially media-tight manner in the line 2 . Preferably, a rigid, dimensionally stable sealing ring bead 24 is arranged as a sealing means 22 on the outer circumference of the inner sleeve 8 (see in particular FIGS. 2 and 3). This sealing ring bead 24 is adapted to the inner cross section of the line 2 with respect to its largest outer diameter such that the line 2 can be non-positively plugged onto the inner sleeve 8 with a slight elastic expansion or can also be removed therefrom. In the plugged-in state, an inner seal is ensured by the force-fitting support of the line 2 on the sealing ring bead 24 .

As far as the connecting means 20 according to the invention are concerned, in all preferred embodiments they consist of a radially inwardly projecting ring collar 26 of the housing body 4 and a holding section 30 of the inner sleeve 8 which is tightly fastened in an opening 28 of the ring collar 26 . There are now various possibilities for the rigid and tight fastening of the holding section 30 within the opening 28 ( FIG. 1), which will be explained in more detail below.

According to FIG. 1, the holding section 30 of the inner sleeve 8 is firmly bonded and is therefore tightly secured around the circumference in the opening 28 of the housing ring collar 26 . Specifically, it can be a tight bond or weld.

In the embodiments according to FIGS. 2 to 4 of the holding section is held positively 8 of the annular collar 26 of the inner sleeve 30 in the opening 28. For this purpose, the inner sleeve 8 has, on the side of the annular collar 26 facing the line receiving opening 6 , axially abutting contact means on the latter, in particular in the form of a radial annular web 32 (FIGS . 2, 4) or annular bead 34 ( FIG. 3). Fixing means are provided at the opposite end of the holding section 30 , according to FIGS. 2 and 3, for example in the form of a radial, preferably conical, sleeve widening 36 .

According to FIG. 4, the connection means 20 may be advantageously also by a positive locking connection is formed. For this purpose, the holding section 30 of the inner sleeve 8 consists of resilient locking arms formed by axial slots, which engage behind the ring collar 26 in a form-fitting manner.

In the embodiment according to FIG. 9, an annular or sleeve-shaped press-in element 37 , which preferably consists of plastic, is arranged as a connecting means 20 between the holding section 30 of the inner sleeve 8 on the one hand and the housing body 4 or its ring collar 26 on the other hand. On the outer circumferential surface of the holding section 30 of the inner sleeve 8 and / or on the inner circumferential surface of the annular collar 26 of the housing body 4 , extensive retaining ribs 39 can advantageously be provided in the manner of tubular mandrel profiles in such a way that the retaining ribs 39 for pressing and holding into the Press in the material of the press-in element 37 , as a result of which, in particular, a positive fit or at least force fit is achieved. The press-in element 37 advantageously sits on a radially inwardly projecting ring web 41 of the housing body 4 or of the ring collar 26 .

Finally, as an alternative - see in particular FIG. 10 - provision can be made to press the holding section 30 of the inner sleeve 8 firmly and tightly into the opening 28 of the annular collar 26 . For this purpose, the pressed-in surfaces can advantageously have a certain surface structure, for example knurling.

In particular in the embodiments with a form-fitting attachment of the inner sleeve 8 , at least one elastic circumferential seal 38 can additionally be provided, which seals the annular gap between the inner sleeve 8 and the housing body 4 . The peripheral seal 38 expediently sits radially between the housing ring collar 26 and the holding section 30 of the inner sleeve 8 . For this purpose, reference is made to the explanations according to FIGS. 2 to 4. Referring to FIG. 2, the seal 38 is seated in the angular range between the holding portion 30 and the adjacent annular ridge 32 of the inner sleeve 8 in an annular chamber which is formed by an inner chamfer of the annular collar 26th The same also applies to the embodiment according to FIG. 4. According to FIG. 3, the annular collar 26 has an inner, radial annular groove within its opening, in which the peripheral seal 38 is arranged, so that it rests radially on the outer circumference of the holding section 30 .

In a further advantageous embodiment of the invention a counter-cone surface 40 is formed and arranged such that the clamping element 12 is forced radially spreadable for releasing the line 2 by sliding against the counter-conical surface 40 within the housing body. 4 In the embodiments according to FIGS. 2, 4 and 5, the counter-cone surface 40 is advantageously formed on the piece with the inner sleeve 8 ring ridge 32, which also acts as a stop means for the form-locking fastening. In the alternatives according to FIGS. 1 and 3, the counter-conical surface 40 is formed on an axial ring shoulder 42 of the housing body 4 which is made in one piece with the housing ring collar 26 .

As can further be seen from FIGS. 1 and 4, the sealing ring bead 24 of the inner sleeve 8 - viewed in the axial direction of insertion - is arranged approximately in an area in which the retaining edge 16 of the tensioning element 12 also lies in the locking position holding the line 2 . Preferably, however, the retaining edge 16 lies axially somewhat lower in the receiving opening 6 than the sealing ring bead 24 , so that these two functional means ( 16 and 24 ) advantageously mutually support one another both with regard to the sealing effect and with regard to the retaining effect. This means that the retaining edge 16 presses the line 2 radially shortly behind the sealing ring bead 24 against the inner sleeve 8 , which on the one hand improves the seal but also the mechanical holder.

. In the embodiments according to Figures 1 to 4 of the housing body 4 is in each case formed as an insertion cartridge, the peripherally sealed in a bore 44 of a - in principle any - aggregates part 46 is used (see to this Figures 6 to 8..). For this purpose, the housing body 4 has holding and sealing means 50 on its, in particular, cylindrical outer peripheral surface 48 . These are, in particular, ring-shaped toothing elements which can ensure both a mechanical holder and a seal. If necessary, at least one elastic seal can also be provided (not shown).

Regarding now the embodiment of FIG. 5, there is a through connector 52 made of at least two, as shown but is as a T-connector made of three plug valves 1 of the inventive type. A uniform housing body 4 with a corresponding number of line receiving openings 6 is provided.

Since, according to the invention, the housing body 4 and the inner sleeve 8 are two separate, separately produced individual parts in all versions, these parts can consist of basically any materials and material combinations. In order to achieve the best possible rigid support for the line 2 , the inner sleeve 8 is preferably made of metal, for example brass. This also favors the formation of the sleeve widening 36 in the embodiments according to FIGS. 2 and 3. In addition, the contour in the area of the sealing ring bead 24 can also be formed by shaping (upsetting). Basically, it can also be a turned part. For the embodiment according to FIG. 4 with a snap fastening of the inner sleeve 8 , this is expediently made of a suitable plastic.

The housing body 4 can also be made of plastic or metal. Metal is preferably used for the formation as a press-in cartridge according to FIGS . 1 to 4. A suitable plastic can also be used for the embodiment according to FIG. 5.

In Figs. 6 to 8 still specific embodiments thereof are now presented, in each of which the housing body 4 consists of two interconnectable parts, namely a usable particularly in the manner of an insertion cartridge in a bore 44 of any assembly part 46 insert part 4 a and with the line 2 connectable connector 4 b. The type of connection of the line 2 to the connecting part 4 b is basically arbitrary, that is to say actually independent of the embodiments already described above. However, it is preferably one of the designs of the plug-in fitting 1 according to the invention. According to the invention, the insert 4 a is designed such that it can be connected either to the connecting part 4 b or directly to the line 2 . The insert 4 a is thus a connection adapter.

The insert part 4 a and the connecting part 4 b can preferably be connected to one another via a particularly positive locking connection 60 . The insert part 4 a has a receiving opening 6 a, which largely corresponds in its design to the receiving opening 6 provided for the line 2 of the connecting part 4 b. The connecting part 4 b has a sealing section 62 which can be inserted into the receiving opening 6 a of the insert part 4 a. An inner annular groove 64 is formed within the receiving opening 6 a of the insert part 4 a, into which the connecting section 62 of the connecting part 4 b engages with spring-elastic latching elements 66 . For pressure-tight sealing, a radial seal 68 can be arranged between the receiving opening 6 a of the insert part 4 a and the inserted connecting section 62 of the connecting part 4 b. Alternatively or additionally, an axial seal 70 can be arranged between the insert part 4 a and the connecting part 4 b. The axial seal 70 advantageously also holds the connection under a pretension against relative movements.

Due to the design of the insert part 4 a, only the tensioning element 12 needs to be used for the direct connection of the line 2 , since the insert part 4 a is already equipped with the inner sleeve 8 . However, if an indirect line connection is to be made via the connecting part 4 b, the clamping element 12 is removed from the insert part 4 a. The inner sleeve 8 can remain in the insert 4 a.

This configuration achieves a very high degree of application variability.  

The connecting part 4 b can be provided in different variants, in particular with regard to the number and angular orientation of connected lines. Referring to FIG. 6 is a 90 ° elbow, as shown in FIG. 7 by a T-piece and in FIG. 8 by an angle piece with a deflection angle α = 135 °.

As regards the embodiment shown in FIG. 10, it is provided that the housing body 4 has an annular insert part 72 in the region of the mouth side of the receiving opening 6 . This insert part 72 is inserted into the initially cylindrical receiving opening 6, in particular press-fitted, wherein the insert part 72 cooperating with the clamping element 12 the inner cone surface 14 or at least a generally functionally identical (equivalent), radially inwardly projecting step edge or step surface 14 a (Cf. also Fig. 9). The insert part 72 leads to the advantage of easier manufacture and assembly of the plug-in fitting 1 . The insert part 72 can preferably consist of metal, in particular brass, but possibly also of plastic.

The invention is not based on the illustrated and described Embodiments limited, but also includes all within the meaning of the invention equivalent designs. Furthermore, the invention is also not yet limited to the combination of features defined in claim 1, but can also by any other combination of certain characteristics of all overall disclosed individual features can be defined. This means that basic In addition, virtually every single feature of claim 1 is omitted or by at least one individual feature disclosed elsewhere in the application is replaced  can be. In this respect, claim 1 is only a first formulation try to understand for an invention.

Claims (23)

1. plug-in fitting ( 1 ) for the detachable connection of a pressure medium line ( 2 ), consisting of a housing body ( 4 ) with a receiving opening ( 6 ) for inserting one end ( 2 a) of the line ( 2 ) and with one in the housing body ( 4 ) in a coaxially within the receiving opening ( 6 ) extending arrangement attached inner sleeve ( 8 ) for engaging in the inserted line end ( 2 a), wherein in the receiving opening ( 6 ) a clamping element ( 12 ) is axially displaceably mounted so that it for holding the line ( 2 ) cooperates with an inner conical surface ( 14 ) or contact step ( 14 a) of the housing body ( 4 ) and thereby acts radially inwards with at least one retaining edge ( 16 ) in a positive or non-positive manner against the outer circumference of the line ( 2 ), characterized in that the inner sleeve ( 8 ) is rigidly fixed in a media-tight manner in the housing body ( 4 ) by means of connecting means ( 20 ), and - in particular with a seal media ( 22 ) - engages circumferentially in a media-tight manner in the line ( 2 ). 2. Plug-in fitting according to claim 1, characterized in that the inner sleeve ( 8 ) as a sealing means ( 22 ) on its outer circumference has at least one sealing ring bead ( 24 ) which, with respect to its outer diameter, is so fitted to the inner cross section of the line ( 2 ) that the line ( 2 ) can be non-positively plugged onto or removed from the inner sleeve ( 8 ) and an internal seal is ensured when plugged in. 3. Plug-in fitting according to claim 1 or 2, characterized in that the connecting means ( 20 ) from a radially inwardly projecting ring collar ( 26 ) of the housing body ( 4 ) and in an opening ( 28 ) of the ring collar ( 26 ) tightly fastened holding section ( 30 ) of the inner sleeve ( 8 ). 4. Plug-in fitting according to claim 3, characterized in that the holding section ( 30 ) of the inner sleeve ( 8 ) is integrally and thereby tightly secured in the opening ( 28 ) of the housing ring collar ( 26 ). 5. Plug-in fitting according to claim 3, characterized in that the holding section ( 30 ) of the inner sleeve ( 8 ) in the opening ( 28 ) of the annular collar ( 26 ) is held in a form-fitting manner. 6. Plug-in fitting according to claim 5, characterized in that the inner sleeve ( 8 ) on the line receiving opening ( 6 ) facing side of the ring collar ( 26 ) on the latter axially abutting contact means, in particular in the form of a radial annular web ( 32 ) or annular bead ( 34 ), and at the opposite end of the holding section ( 30 ) fixing means, in particular in the form of a radial, preferably conical sleeve expansion ( 36 ). 7. Plug-in fitting according to claim 5, characterized in that the connecting means ( 20 ) are formed by a positive locking connection. 8. Plug-in fitting according to claim 3, characterized in that the holding section ( 30 ) of the inner sleeve ( 8 ) is pressed into the opening ( 28 ) of the ring collar ( 26 ), directly or indirectly via an annular press-in element ( 37 ). 9. Plug-in fitting according to one of claims 1 to 8, characterized in that the inner sleeve ( 8 ) is sealed against the housing body ( 4 ) via at least one elastic peripheral seal ( 38 ). 10. Plug-in fitting according to claim 9, characterized in that the peripheral seal ( 38 ) sits radially between the housing ring collar ( 26 ) and the holding section ( 30 ) of the inner sleeve ( 8 ). 11. Plug-in fitting according to one of claims 1 to 10, characterized in that a counter-cone surface ( 40 ) is arranged within the housing body ( 4 ) such that the clamping element ( 12 ) for releasing the line ( 2 ) by sliding against the counter-cone surface ( 40 ) is radially expandable. 12. Plug-in fitting according to claim 11, characterized in that the counter-conical surface ( 40 ) is formed on an annular web ( 32 ) which is made in one piece with the inner sleeve ( 8 ). 13. Plug-in fitting according to claim 11, characterized in that the counter-conical surface ( 40 ) is formed on an axial ring shoulder ( 42 ) made in one piece with the housing ring collar ( 26 ). 14. Plug-in fitting according to one of claims 1 to 13, characterized in that the sealing means ( 22 ) of the inner sleeve ( 8 ), viewed axially, are arranged approximately in an area in which the retaining edge ( 16 ) of the clamping element ( 12 ) in which the Line ( 2 ) holding position. 15. Plug-in fitting according to one of claims 1 to 14, characterized in that the housing body ( 4 ) is designed as a press-fit cartridge which can be inserted circumferentially tightly into a bore of an aggregate part. 16. Plug-in fitting according to claim 15, characterized in that the housing body ( 4 ) on its outer peripheral surface ( 48 ) has holding and sealing means ( 50 ). 17. Plug-in fitting according to one of claims 1 to 16, characterized in that the housing body ( 4 ) in its for holding the line ( 2 ) with the clamping element ( 12 ) cooperating area is formed in one piece or has a pressed-in insert part ( 72 ) in particular. 18. Through connector ( 52 ), characterized by at least two plug-in fittings ( 1 ) according to one of the preceding claims, wherein the housing body ( 4 ) is a common, in particular one-piece component and has a corresponding number of line receiving openings ( 6 ). 19. Plug fitting, in particular according to one of the preceding claims, consisting of a housing body ( 4 ) with at least one receiving opening ( 6 ) for sealing and lockable against loosening insertion of a line ( 2 ), characterized in that the housing body ( 4 ) consists of two together there are connectable individual parts, namely an insert part ( 4 a) which can be inserted into a bore ( 44 ) of an aggregate part ( 46 ) and a connection part ( 4 b) which can be connected to the line ( 2 ), the insert part ( 4 a) being designed in such a way that it is optionally bindable with the connecting part ( 4 b) or directly with the line ( 2 ) ver. 20. Plug-in fitting according to claim 19, characterized in that the insert part ( 4 a) and the connecting part ( 4 b) can be connected via a particularly positive locking connection ( 60 ). 21. Plug-in fitting according to claim 19 or 20, characterized in that the insert part ( 4 a) has a receiving opening ( 6 a) which largely corresponds in its design to the receiving opening ( 6 ) of the connecting part ( 4 b), the connecting part ( 4 b) has a connecting section ( 62 ) which can be inserted into the receiving opening ( 6 a) of the insert part ( 4 a). 22. Plug-in fitting according to claim 21, characterized in that an inner annular groove ( 64 ) is formed within the receiving opening ( 6 a) of the insert part ( 4 a), into which the connecting section ( 62 ) of the connecting part ( 4 b) with resilient locking elements ( 66 ) intervenes. 23. Plug-in fitting according to claim 21 or 22, characterized in that between the receiving opening ( 6 a) of the insert part ( 4 a) and the inserted connecting section ( 62 ) of the connecting part ( 4 b) a radial seal ( 68 ) and / or between the insert part ( 4 a) and the connecting part ( 4 b) an axial seal ( 70 ) are / is.