FI70465B - ANORDING VID EN KOPPLINGSDEL - Google Patents

Description

70465

The present invention relates to a device for use in a coupling part, comprising a fixed and movably fitted valve body and a longitudinally displaceable sleeve, which in the sealing position is intended to seal against the valve body by a sealing part fitted to the latter, the valve body being formed against which the sleeve rests through its first end in the sealing position, on the other hand by an additional surface connected to a curved surface at one end ending at a tip bent over the sealing element, the outer diameter of which is smaller than the inner diameter of the sleeve between the interior above and the space in which the sealing element is fitted.

It is already known to make said leak-proof switch. as a flat cam switch, characterized in that both coupling parts have cam parts with substantially flat front surfaces which can be easily dried before the coupling parts are connected. In such a leak-free laa canopy coupling, said sleeve is an inner sleeve which in one direction is subjected to the action of a spring and in the other direction movable by means of a second coupling part against said action of the spring. In this case, it is important that the sleeve, in its position where it is not affected by the second coupling part, can settle into the sealing position by the action of said spring and by any pressure of the medium present in the coupling part thus closed. The sealing arrangement must then be such that the coupling force does not become too great when the coupling parts are brought together. The known flat cam coupling also uses a cover sleeve arrangement which is movable with respect to said sleeve and valve body. Said cover sleeve arrangement has an outer surface included in a substantially flat front surface of the coupling part.

70465 In such couplings, it is important to provide a sealing arrangement for the inner sleeve and valve body that provides the required high level of sealing. At the same time, however, the construction of these parts must be such that the manufacturing costs can be considered relatively low.

It is also important that the various parts of the coupling are made in such a way as to prevent the ingress of dirt and foreign particles at the front surfaces of those coupling parts.

The object of the present invention is to provide a device which solves e.g. the problems mentioned above. The new device is mainly characterized in that said radially extending part and the additional surface are connected to each end of the axially extending surface, and that the lower end of the sleeve is formed by a radial end surface resting against the applied support surface in said sealing position and an axially inner surface, against the axially extending surface of the valve body and the sealing element so as to provide in said sealing position a rectangular gap behind the sealing element, in which the sleeve with said lower parts extends completely over the sealing element. is fitted to the valve body with a high degree of fitting, so that the pressing of the sealing element against the inner surface of the sleeve takes place mainly only in the radial direction you.

In further developments of the idea of the invention, it is proposed e.g. that the tip is arranged so that the sealing part is protected against the pressure of the medium. In addition, a closer structure of the support member and the inner sleeve is shown so as to form an appropriate space which in principle exceeds

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3 70465 of the sealing member and is adapted so as to effectively cause the sealing member to deform.

This part is pressed partly directly radially against the radial upper surface of the support member, into a ditch directly radially against the inner wall of the sleeve, thus providing a secure sealing of the substantially radial gap between the valve body and the sleeve.

These further developments also propose improvements to the inner sleeve and valve body structures that are possible thanks to the invention. To this end, it is shown how the support member is to be fitted with respect to opposite parts of the second sleeve formed by the cover sleeve. This second sleeve is arranged outside and movably relative to both the inner sleeve and the valve body. The latter parts can then be included in a flat-spout environment leak-proof switch, in which both switch parts have a quick-connect function.

However, the new device can mainly be considered to be characterized by what is stated in the characterizing part of the following claim 1.

With the help of what is proposed here, an efficient sealing arrangement is obtained, which has technical and economic advantages e.g. in such switches, the other parts of which, thanks to the invention, can also otherwise be given a suitable and economical structure.

Thanks to the new device, only one gap is formed in the substantially flat front surface of the coupling part in question, which significantly reduces the risk of dirt penetrating the system. In addition, the sealing part is placed in a position protected from dirt and foreign particles.

4,70465

The sealing arrangement operates at both low and high pressures, with the latter being up to 30 MPa or more. In the latter case, the sealing arrangement and the sleeve are arranged in such a way that the pressure of the medium itself acts on the sealing part and, by means of the purely axial and radial forces developed here, contributes to an effective sealing.

Thanks to the proposed arrangement, the sleeve does not have to rest on the support member through oblique sealing surfaces, which require a relatively high manufacturing accuracy and a large material thickness of the sleeve.

The presently described embodiment of a device having the features of the invention will be described with reference to the accompanying drawings, in which Figure 1 shows, in longitudinal section and in disconnection, two quick-release coupling parts for hydraulic oil which together form a leaked environmental switch and have substantially flat , Fig. 2 shows a longitudinal section of the coupling parts according to Fig. 1 in a fully connected position, where the coupling has taken place by means of automatic coupling parts of the coupling parts, Fig. 3 shows a longitudinal section and enlarged front parts of the first coupling part (female part) of Figs. 3 parts, Fig. 5 shows a longitudinal section of a modified embodiment of a coupling part according to the invention, and Fig. 6 shows a longitudinal section of a further modified embodiment of the coupling part according to the invention.

Il 70465 5

The clutch according to Figures 1 and 2 comprises a first clutch part 1 and a second clutch part 2, wherein the clutch part 1 consists of a female part and a clutch part 2 of a male part. The switch forms a so-called a flat cam switch having a substantially flat front surface 1a and 2a, respectively, in each switch portion.

Such switches are already known per se, which is why their basic structure and operation will only be explained here in general terms. The first coupling part 1 comprises a valve body which is fixed relative to it and coaxially arranged inside it, which is a so-called arm structure. The inner part 4, partly the outer sleeve or cover sleeve 5, is movably arranged relative to the valve body 3. The outer sleeve 5 is angular at one end and under the influence of a helical spring 6 at the other end, whereby the spring tends to keep the outer sleeve extruded against said front surface 1a.

The valve body includes e.g. a valve head 3a supporting a seal 7. The inner sleeve in its first end portions 4a is intended in the sealing position shown in Fig. 1 to co-operate with said valve head 3a and a sealing ring 7 so as to provide a sealing action between the sleeve 4 and the valve head 3a. The spring 8, preferably a coil spring, acts on the other end parts of the sleeve 4, in particular on the end edge 4b, and tends to keep the inner sleeve in the sealing position. In its upper end parts, the inner sleeve bears a second seal 9, which is a so-called a "back-up" seal of the type known per se. The sleeve 1 is mounted in a first recess Ib of the first coupling part, the sleeve being guided by the first inner wall Ib 'of said recess. The sealing between the sleeve 4 and said inner wall Ib 'takes place by means of said seal 9. Said first space forms a sub-space of the first clutch part 70465, and a part le extending axially inside the first clutch part is formed therein.

The outer sleeve bears in the first coupling part a second space Id, the wall of which is marked Id '. The outer sleeve is guided against this inner wall Id ', and the outermost end position of the outer sleeve is determined by the shoulder 5a therein. The angled part 5b of the outer sleeve is intended to cooperate with the front parts of the second coupling part, by means of which the outer sleeve can thus be pushed inside the first coupling. At a certain degree of insertion, the outer sleeve begins to co-operate with the inner sleeve 4 and takes this with it. The insertion takes place by the interaction of the free end of the angular part 5a and the shoulder 4c, said shoulder being provided by the lower sleeve 4d of the inner sleeve.

The valve body is also provided with a stem portion 3b extending coaxially with respect to the inner sleeve and up to or above the latter upper end surface 4b. At its end facing the valve head 3a, the arm is likewise connected to a flow distribution chamber 3c belonging to the valve body, which has an external thread which is rotatable to the corresponding internal thread le of the coupling part 1.

In the flow distribution chamber, the current coming from the inlet space lf of the coupling part is divided into a plurality of outlets 3c ', 3c ", which may be four, for example, evenly distributed around the central axes 10 of the coupling part. The outlets are still oblique and terminate in the chamber. on oblique surfaces 3b "and 3b '' '. From said outlets, current is led down to space Ib and inside the sleeve 4. In the sealing position of the sleeve, the pressure in the first coupling part affects e.g. the upper end surface 4b of the inner sleeve. The medium is sealed with seals 7 and 9 as described above.

il 7 70465

The first coupling part also includes lock sleeves 11 and 12 known per se, which by means of locking balls 13 and 14 and the second spring 15, respectively, are adapted in a known manner to enable automatic quick-coupling operation in the coupling of the coupling parts 1 and 2.

For this purpose, the second coupling part is provided with a radial outer groove 2b, by means of which cooperation with the locking balls 13 of the first coupling part takes place.

The second coupling part 2 is known in its entirety. It has a radially displaceable valve body 16 which is compressed by a spring 17 towards the front parts of the coupling part. The valve body 16 is mounted coaxially on a cross bearing 18 which rests against the inner wall 2c of the coupling part 2. The valve body 16 is expanded at its free end and sealed with a "back-up" type seal 19.

Fig. 2 shows, among other things, how the flow path is formed between the connected parts 1 and 2, whereby the medium flow is denoted by 20. Although the flow itself can be thought of in the opposite direction, the flow path 20 leads from the space lf through the flow distribution chamber 3c to the inner sleeve 4 and into the space between the arm 3b, further outside the valve heads 3a and 16 and down and through the cross-bearing vanes 18. In the state thus opened, the flow is sealed by means of a seal 9 and a seal 19, which seals the inner sleeve 4 against the outside at the downcomer 4d.

The figure shows in more detail e.g. a strip 21 made of a material of the valve head 3a, which rests on the sealing part 7 in a lowered position, so that the sealing part is securely attached to the valve head. The valve head 3a also supports a radially extending support member 22 which supports 8 70465 a substantially radial support flange or support surface 22a against which the sleeve end 4a is adapted to rest in a straight and parallel end surface 4a 'extending parallel to the surface 22a. The outer tip of the lowered strip 21 and the outer tip of the support member 22 are denoted by the numbers 21 'and 22', respectively.

Referring again to Figure 2, said outer tips 21 'and 22' are also shown here. In this case, it becomes clear that the imaginary straight line drawn between said tips extends completely outside the sealing part or mainly in connection with the tangent of the sealing part which is parallel to said straight line. This gives the sealing part a protected position against the medium flow, which is deflected towards the upper surface 3a 'of the valve head 3a. If the medium is, for example, hydraulic oil, the foreign particles in this oil will not enter the sealing part and cannot adversely affect it.

Figure 2 also shows that the lower parts 4a of the inner sleeve have an internal bevel 4a ", which facilitates the guide of the sleeve to the sealing position by means of the strip tip 21 ', which then also acts as a guide member of the inner sleeve.

The inner sleeve has a simple structure with a straight inner wall 4e and a straight outer wall lowered by a step with a straight lower inlet 4d (Fig. 1).

The support member 22 shown in Figure 3 is relatively sturdy and has a thickness of 0.5-5 mm depending on the type of switch and / or the size of the switch. The plane of the straight radial upper surface 22a is raised at the position of the sealing ring 7, whereby the surface displaced parallel to the surface 22a is denoted by the number 22b. The latter sub-surface joins the inner wall 4a of the inner sleeve as the inner sleeve rests on the support member. Said surface 22b becomes a curved circular sub-surface 22c terminating at the top

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9 70465 to said lowered strip 21. The support member is substantially as thick, preferably slightly thicker, than the free end 5a 'of the angular part 5a of the outer sleeve 5.

Thus, a substantially closed space 23 is formed for the sealing part 7 by means of the sub-surfaces 22b and 22c, the lowered strip 21 and the inner wall 4e. Said closed space communicates with the interior of the sleeve through a slot 24 directed away from the support member 22 and having a width of 0.1-0.2 mm.

The volume of the space 23 is larger than the volume of the sealing part 7, and the sealing part protrudes outside the strip 21 in the radial direction 2 / 5-1 / 10 of its section, which in the present case is circular. The ejection degree is then approx. 1/5.

Thanks to the stepped, radial sealing surfaces 22a and 22b, whereby the end face 4a1 of the sleeve rests against the surface 22a and the surface 22b leaves the inner surface 4e of the sleeve, efficient sealing operation is also obtained at high media pressures acting axially through the gap 24. The sealing part is pressed axially against the surface 22b under the effect of pressure, and the radial forces generated in the sealing part act on the inner surface 4e of the sleeve. In this case, an efficient sealing operation is obtained, and there may be a relatively small material thickness on the core. At low media pressures, the spring 8 ensures that the sleeve is pressed against the support surface 22a, so that the necessary sealing is obtained via the inner wall 4e of the sleeve. The pressure of the medium acts on the end surface 4b of the sleeve and at high pressures together with the spring ensures sufficient contact of the sleeve.

Said free end 5a of the angular part 5c of the outer sleeve 5 is located opposite the free end surface 22d of the support surface, these opposite surfaces having the same height and a gap of 0.1-0.5 mm arranged between them. The substantially flat lower surface 5a '' 'of the angular part, which at its free end joins the flat lower surface of the valve head 3a, is also inclined so as to be inclined inwards / upwards from the outer edge. The angle of inclination α is then 0-15 °, preferably about 5 ° in the case shown.

The outer edge 5a '' 'of the radial part 5a is connected to an inclined surface Ig arranged in the ball holder Ib of the first coupling part, which is about 45 ° with respect to the axis 10 and made of about 1 / 2-2 / 3 of the material of the ball holder Ig. The front surface of the first coupling part thus consists of straight and interconnected sub-surfaces 26 (at the valve end 3a), 5a "(in part 5a), and Ig 'and Ig" (in part Ig). Said inclined surface 5a "in the interconnected position of the coupling parts creates an annular or wedge-shaped space 27 into which small amounts of non-drying dirt, oil, etc. can be pushed aside so as not to interfere with the coupling.

Figure 4 shows a case where the lower surface 5a "is also straight. In this case, the thickness of the support member is denoted by the number 1a and the step between the surfaces 2a and 22b by reference b. The latter distance is 0.1-2.0 mm. The operation of the switch is known. The male part 2 is inserted into the female part, whereby the outer sleeve 5 is pushed in and the seal 19 seals against the inner sleeve when the coupling force opens the valve 16 of the male part 2. At a certain degree of insertion of the outer sleeve, it begins to cooperate with the inner sleeve and pulls Thus, when the parts are locked together, the flow 20 is completely open.

il 11 70465

When the parts are disconnected, the springs 6 and 8 return the sleeves 5 and 4, respectively. The interaction of the seal 19 with the sleeve 4 ceases only after it has sealed against the valve head 3a, after which the outer sleeve 5 as well as the valve of the coupling part 2 return to its end position.

The invention is not limited to the embodiment exemplified above, but may be modified within the scope of the following claims. Thus, the whole valve 3a, 3b, 3c or parts thereof can be adapted to be displaced slightly in the axial direction with respect to the first coupling part. Likewise, the outlet openings of the flow distribution chamber 3c can be arranged farther from the lower opening of the first coupling part, i.e. the outer wall 30111 can be lengthened and the arm 3b can be shortened to the desired extent.

Figures 5 and 6 show further embodiments of a coupling part according to the invention. When the media pressures are high, it may be desirable to relieve the fixed valve body from the forces of the sleeve 4 'and 4 ", respectively, so that the latter does not rest solely on the valve head 3a' and 3a" respectively in the closed position. According to said embodiment, the first coupling part is with a part separating the outer sleeve 5 'and the 5 "spring space, respectively, from the inner sleeve 4', 4" space. This tubular part is fixed to the coupling body by threads 29 and 32, respectively.

Said tubular part bears a flow distributor 29, which according to Fig. 5 can be fastened to the tubular part with a compression fitting or according to Fig. 6 with threads 34. In a corresponding manner, the valve body can be fastened to the flow distributor by means of a compression fitting according to Fig. 5 or by threads 33 according to Fig. 6.

The tubular part is provided at the bottom with a push-in flange which acts as a relief member for the sleeve 4 ', 4 "with a corresponding flange or shoulders located below the sleeve" back-up "type sealing member. The end positions of the sleeve are shown in the figure intact and in broken lines, respectively. In addition, the top of the sleeve has a stop for the associated spring.

Said relief mangles are then arranged in such a way that the sealing action between the sleeve 4 ', 4 "and the valve head 3a', 3a" always certainly starts before the relief. In these embodiments, the outer sleeve 5 ', 5 "is provided with axial slots at its upper end. The slots allow the outer sleeve to be inserted from the front surface of the coupling part during manufacture. During use, the split portions of the outer sleeve may resiliently and then resilient outward.

The structures according to Figures 5 and 6 also enable the relatively simple and inexpensive manufacture of the coupling part in question. The unit consisting of pre-assembled parts can be installed mainly from the rear. Raw material is also saved, so that a simple and inexpensive coupling part is obtained.

The object of the invention enables switches which are suitable for a rational manufacturing method in larger and smaller workplaces.

Claims (10)

Device at a coupling member comprising a fixed or movable valve body (3a, 3b, 3c) and a longitudinally displaceable sleeve (4) which in a sealing position is intended to seal against the valve body via a sealing element arranged thereafter ( 7), wherein the valve body (3a, 3b, 3c) is formed partly with a support member (22) supporting a radially extending support surface (22a) against which the sleeve starts via its front end as it assumes the sealing position and partly with an additional surface (22b) which, to form an insertion space for the sealing member (7), is connected to a pivoted surface (22c) which terminates at its other end with a tab (21) rolled over the sealing member, which is provided with an outer diameter less than the inner diameter of the sleeve such that an axial gap (24) exists between the inner space of the coupling member above the tab and a space (23) in which the sealing element is positioned, characterized in that said radially extending surface (22a) and the additional surface (22b) are connected the end of each of an axially extending surface and the lower part of the sleeve (4) is formed with a radial end surface (4a), which in said sealing position rests with a wide abutment against the support surface (22), and an axial inner surface (4e) , which in the sealing position is opposed to said axially extending surface of the valve body (3a, 3b, 3c) and the sealing element (7), so that in said sealing position there arises a rectangular gap located behind the sealing element (7) at which the sleeve (4) part extends completely past the sealing member (7) to separate the supporting and sealing functions of the sleeve (4) while propagating media pressure propagated by the axial gap (24) with high degree of embedding in the valve body (3a, 3b, 3c) the sealing member (7) so that its pressing against the inner surface of the sleeve (4) takes place mainly in a radial direction only. Il 70465 17 2. Apparatus according to claim 1, characterized in that the rolled-out tab (21) extends over the sealing element, which thereby has an O-ring shape, so that it protrudes in the radial direction outside the tab by 2/5 - 1/10, before - about 1/5, of its cross-section. 3. Device according to claim 1 or 2, characterized in that the hoist (4) is formed with an axially straight inner wall (4e), the first end part (4a) of which supports said radial end edge and cooperates with the sealing element, and that the sleeve is spring-loaded. at its second end portion (4b) with a compression spring (8) acting against the current sleeve end. Device according to claim 1, 2 or 3, wherein the valve body consists of a valve head (3a) supporting a sealing element (7) and a shaft (3b) fixed at its first end which extends coaxially within the sleeve (4). ), characterized in that the sleeve extends in connection to the other end of the shaft which is attached to a flow distributor housing (3c), which is in the valve body, which is in turn fixed in the coupling part so that its orifices (3c ', 3c " ), which leads into the recess (1b) of the first coupling part (1) where the sleeve (4) is stored, is located at the other end part of the sleeve. Device according to any of the preceding claims, wherein a further sleeve, here referred to as the second sleeve (5), is arranged radially outside the first sleeve, hereinafter referred to as the first sleeve (4), and displaceable relative to the coupling part and the first sleeve, characterized thereof, that the support member (22) has an axial straight end edge (22d) opposed to a corresponding straight end edge of the second sleeve (5) with an intermediate gap of 0.1-0.5 mm width, and that the support member (22) exhibits a thickness, e.g. 0.5-5 mm, which substantially corresponds to the thickness of that part of the other