KR100218574B1 - Connection device of high pressure water pipe - Google Patents

Abstract

The present invention relates to a coupling device of the high pressure water pipe (11). The coupling device includes a casing 2 with a casing cutout 4, in which the tension tweezers 8 are arranged to move in the axial direction. The tension tweezers has a plurality of fixing elements 19 inward in the axial direction, and the fixing elements are separated from the fixing position for supporting the high-pressure water pipe 11 by cooperating with the surfaces 32 and 33 on the case side. You can move between them. The fixing element 19 is attached to the manipulation segment 24 via the bend 23, and the manipulation segment is secured to the stop shoulder 37 of the casing 2 using the safety projection 36. This prevents the tension tweezers 8 from being pulled out of the casing cutout 4.

The stationary element is provided with a linear stationary end 48 to smoothly perform the stationary action.

Description

Combination device of pressure medium pipe

1 shows an assembly form of a coupling device, in which the housing is shown in longitudinal section and the pressure medium pipe and sealing ring are only shown in dashed lines.

FIG. 2 is a cross-sectional view of the coupling device of FIG. 1 with the housing omitted in the direction of arrow II, with the collet chuck broken at one point of its circumference to show the shape of the cross section of the bend. FIG.

3 shows the collet chuck of FIGS. 1 and 2, with the housing omitted, taken along the cutting line III-III and viewed from the axial direction.

4 is a view showing the collet chuck shown in FIGS. 1 to 3 along the arrow IV in FIG.

5 is a longitudinal sectional view of the collet chuck taken along cutting line V-V to show the assembling holes.

FIG. 6 is a longitudinal sectional view of one point of the outer circumference of the collet chuck with safety projections, taken along cut line VI-VI of FIG. 3;

* Explanation of symbols for main parts of the drawings

1: coupling device 4: housing cavity

7: outer thread 8: collet chuck

11 pressure medium pipe 12 connection end

19: clamp element 21: housing wall

23: bend portion 24: operating portion

26: coupling bridge 30: working projection

34: insertion direction 35: clamp portion

36: safety protrusion 37: stop shoulder

54: auxiliary hole for assembly 56: distribution

The present invention relates to a coupling device for a pressure medium pipe having a housing provided with a housing cavity, in which one annular collet chuck is movably held in an axial direction. The collet chuck has a plurality of clamp elements arranged continuously in the circumferential direction in the interior region of the housing cavity, more specifically in front of the collet chuck, which clamp elements are inserted into the housing cavity via the collet chuck to provide a pressure medium pipe. Surrounding the circumferential region of the connecting end of the clamp element, the clamp element is also coupled via the actuating portion and the bent portion of the collet chuck which is disposed axially outwardly from these clamp elements and protrudes from the housing cavity, An actuating protrusion is provided that projects radially outward. This actuating protrusion protrudes into a recess formed in the housing wall of the housing cavity, the axially inner side of the region located further radially opposite the bend, surrounded by the stop surface and the axial outer side by the support surface. . As a result, when the collet chuck moves axially outward in the direction opposite to the insertion direction of the connecting and end portions, the actuating protrusion collides with the supporting surface of the axially outer side, and the pivoting movement of the clamp element in the radially inward direction is performed around the bent portion. Occurs in At this time, the clamp portion of the clamp element presses the outer circumference of the inserted connecting end portion. Conversely, when the collet chuck moves inwardly in the axial direction, the pivoting movement of the clamp element outward in the radial direction occurs around the bend, whereby the clamp portion of the clamp element releases the connecting end into which it is inserted.

Coupling devices having this feature are described in US Pat. No. 3,743,326. In this patent, the pressure medium pipe inserted into the housing cavity of the coupling device is fixed by the clamp element, which clamp element has a similar inclination of the inclined surface of the actuating protrusion and of the support surface of the housing so that the clamp element is connected to the housing. It is supposed to be adjacent. When a tensile load is applied to the pressure medium pipe, the clamping force is increased by the interaction of the pressure medium pipe surface with the collet chuck, regardless of the internal pressure of the pressure medium pipe or the load from the outside. Pressing the collet chuck inward axially to disengage causes the clamp element to pivot and move radially outward. In the engagement device of the type described in the prior German patent application No. 40 07 101.4, this release process is well maintained by the contact of the actuating projection with the stop face mounted in front of the housing.

However, if the pressure medium pipe connected to the housing cavity is subjected to very strong tensile load axially outward, there is a risk that the collet chuck cannot be reliably supported in the housing cavity because the clamp element is abnormally bent inwardly. In this case the collet chuck comes out of the housing cavity with the pressure medium pipe and the coupling is released. Even in this extreme case, damage may occur that adversely affects reuse in the contact area between the housing and the clamp element.

It is therefore an object of the present invention to improve the coupling arrangement of the kind described above so that it can be simply assembled under all operating conditions, ensures reliable operation, and in particular ensures reliable support of the connected pressure medium pipe.

This aim is to allow one or more opposing safety projections to project radially outward from the actuating portion 24 of the clamp element in an area adjacent the inner surface of the housing cavity, the stop shoulders being secured to the housing axially outwardly. This is solved by being surrounded by.

Typically, the clamp element interacts with the support surface to reliably support the collet chuck in the housing of the coupling device. The safety projection does not interfere with the axial movement of the collet chuck to the extent necessary to engage and release the pressure medium pipe. Even when the collet chuck is pulled out of the housing cavity due to an excessively strong tension load, the safety protrusion abuts against the stationary shoulder fixed to the housing to prevent the collet chuck from moving further in the axial direction. In this case, the inserted pressure medium pipe remains reliably undamaged by severe restraint, and the tensile load is effectively received by the safety protrusion and the stop shoulder. Since the safety projections are arranged in the actuating part, they do not affect the clamp elements and the bends.

In order to distribute the force evenly, it is desirable to provide a plurality, in particular two safety projections, at equal intervals around the collet chuck. Since the stop shoulder is formed in an annular shape, the collet chuck rotates freely without being disturbed by the housing. A structurally very preferred solution is that the stop shoulder is formed by the side of the recess provided in the housing wall of the housing cavity, into which the safety projection at least partially protrudes. In addition, it is an advantage that the safety protrusion is formed as a snap element so that its rear end is fastened to the stop shoulder by snapping or engaging, so that a reliable separation is ensured by the simplest assembly.

The clamp portion of the clamp element has a clamp edge extending linearly in the area provided to contact the outer circumferential surface of the pressure medium pipe, by which the clamp action of the clamp element is effectively effected. This clamp edge allows clamping to be performed at high surface pressure when the pressure medium pipe is inserted. Further, in order to more easily improve the bending and pulling action, it is effective to form the bending portion as a coupling bridge in which the inner and outer contours are linear in cross section.

In order to ensure simple assembly, the actuating part of the collet chuck has at least one assembling auxiliary hole penetrating in the axial direction, the axial inside of the assembling auxiliary hole communicating with the distribution area of the clamp element located radially outside of the bend. do. Thus, prior to assembly, the clamp element can be easily guided into the housing cavity, for example, by inserting a pin-shaped assembly auxiliary member into the assembly auxiliary hole to press the back of the clamp element, while radially inward as necessary. Allow it to bend.

In order to help understanding of the present invention, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 shows the coupling device 1 as a whole with a housing 2 which is provided with a housing cavity 4 open towards the assembly side 3. A conduit 5 is connected to the housing cavity 4 continuously coaxially, which terminates at the stationary side 6 opposite the assembly side 3. A part of the housing in which the conduit 5 is arranged is formed with an outer thread 7 so that the housing is fixed by a valve or the like in a suitable screw hole not shown in detail. By such a known method, the coupling device can be flexibly coupled.

In the embodiment, the substantially annular sleeved collet chuck 8 is held movable along the longitudinal axis 9 of the housing cavity 4. The connection hole 10 delimited by the collet chuck penetrates the pressure medium pipe 11 (shown in dashed lines only) in such a way that the front face of the connection end 12 of the pressure medium pipe is inserted into the housing cavity 4. can do.

At the same time, a sealing element 17, such as a double lip shaped sealing ring, shown only by a dashed line, is disposed opposite the axial front of the collet chuck 8 inside the housing cavity 4. It is fixed between the housing step 16. This sealing element closely surrounds the connecting end 12, and the insertion depth of the front face 18 which is inserted deeper at the connecting end can be limited by the housing step.

The collet chuck 8 has a plurality of clamp elements 19, which in the axial direction of the front face of the collet chuck continuously at equal intervals in the circumferential direction 20 shown by arrows in the region inside the housing cavity 4. It is arranged inside. These clamp elements can fix the pressure medium pipe 11 coaxially opposite the collet chuck 8, which also encloses the housing wall 21 of the housing 2 surrounding the outer periphery of the housing cavity 4. ), The pressure medium pipe 11 is finally fixed against the housing 2.

Within the scope of the present invention, a housing cavity and / or fixing side 6 or other securing means may be provided which incorporates a collet chuck in the coupling device.

Each clamp element 19 disposed adjacent in the circumferential direction 20 is separated from each other at the split point 22, which in the embodiment is formed in a slit-like manner, so that the clamp elements 19 interfere with each other. Can move radially without work. Further, the bent portion 23 (FIGS. 1, 5 and 6) protrudes further outward in the axial direction from each clamp element 19, so that the sleeved portion of the collet chuck 8 disposed behind it. (Hereinafter referred to as the actuating section 24). The flexure 23 allows the clamp element 19 to pivot easily in the direction shown by the double arrow 25 in FIG. 6, which will be described later. The radial cross-sectional area of the bend 23 is smaller than the cross-sectional area of the connection area between the clamp element 19 and the actuating 24. However, these areas are all integrally molded from plastic. In an embodiment, this cross-sectional area reduction area is formed as a coupling bridge 26. The collet chuck 8 is shown as a completely independent component part in its entirety.

In particular, as shown in FIGS. 5 and 6, each clamp element 19 has an actuating protrusion 30 which projects radially outward. With the collet chuck 8 assembled to the coupling device, this actuating protrusion 30 is formed in an annular recess extending coaxially with respect to the longitudinal axis 9, in the region of the inner circumferential surface of the housing wall 21 of the housing cavity 4. 31) and partially protrude into. In the embodiment, the recesses 31 are formed directly in the housing wall 21, but they may be formed in other places in different ways.

Each actuating protrusion 30 is arranged further radially outward than the flexure 23 or the coupling bridge 26. The portion of each actuating protrusion 30 disposed in the recess 31 forms the surface portion of the recess 31, the axially inward stop face 32 of the housing and the axially outer support of the housing. It is surrounded by the face 33. As clearly shown in FIG. 1, these surface portions have similar inclinations to the surface of the truncated conical portion in which larger axial regions are arranged against each other. In the specific structure shown in FIG. 1, the contour of the cross section of the concave portion is V-shaped, where the inclination with respect to the longitudinal axis 9 is steeper than that of the support surface 33.

The radially inner region of the clamp element 19 has a clamp portion 35 which acts against its outer circumferential surface to clamp the pressure medium pipe 11. As shown in FIGS. 2-6, in the case of the collet chuck 8 with no pipe fitted, the cross-sectional area of the clamp element surrounded by the clamp part 35 is usually surrounded by the actuating part 24. It is slightly smaller than the cross-sectional area of the connecting hole 10 which is present, and the diameter of this connecting hole is almost similar to the outer diameter of the pressure medium pipe 11 to be connected. As a result, when inserting the connecting end 12 of the pressure medium pipe into the housing cavity 4 while the collet chuck 8 is assembled to the coupling device, the clamp portion 35 of the clamp element 19 It is pressed or pivoted radially outward around the bend. In this case, since the clamp part 35 is elastically suspended like the spring through the bend part 23, the clamp force which presses the connection edge part 12 is generated in the clamp part 35. FIG.

In addition, if the collet chuck 8 further moves axially outward in the direction opposite to the insertion direction 34 of the connecting end 12 during operation, for example, the pressure medium pipe 11 and the conduit 5 by compressed air. Due to the internal pressure of) the working projection 30 is joined with respect to the support surface 33. Thus, since the clamp element 19 is pivoted or stretched inwards based on the flexibility of the region of the bend 23, the clamp portion 35 plays an original role of strongly clamping the connecting end 12.

To loosen the connection, it is only necessary to move the collet chuck in the insertion direction 34, which is effective by moving the operating part 24 protruding from the housing cavity 4. As a result of this movement, the actuating projection 30 escapes the support surface 33 and instead presses the stop surface 32. The clamp element 19 is thus pivoted outwards (in the direction of the double arrow 25), whereby the cross section of the clamp portion is widened so that the connecting end 12 can be easily separated.

The actuating protrusion 30 and the stop face 32 function to reliably stop the collet chuck 8. However, the collet chuck 8 is subjected to a very strong force acting in the opposite direction to the insertion direction 34 by, for example, a tensile load of the pressure medium pipe 11 connected to the collet chuck via the clamp portion 35. When provided, it is advantageous to provide additional safety means to prevent the collet chuck 8 from escaping from the housing cavity 4. In this embodiment, in addition to the actuating protrusions 30, two safety protrusions 36 are provided on the actuating portion 24 opposite to each other in an area adjacent to the inner surface of the housing cavity 4. Is projected radially outward from the corresponding portion of the collet chuck 8 area opposite the longitudinal axis, and is surrounded by a stop shoulder 37 fixed to the housing. In this embodiment the stop shoulder 37 is formed by the side of the annular recess 39 recessed in the housing wall 21 of the housing cavity 4, into which the safety projection 36 protrudes. . The stop shoulder 37 is formed in an annular shape and surrounds the operating part 24 coaxially.

One safety protrusion may be sufficient, but it will be appreciated that any number of safety protrusions 36 can be installed. Placing the safety protrusions at equal intervals around the actuator 24 is advantageous for evenly transmitting the force.

The arrangement of the actuating protrusion 30, the support surface 33, the safety protrusion 36 and the stop shoulder 37 is such that the safety protrusion 36 is not connected to the stop shoulder 37 during normal operation. It is desirable not to interfere with the clamping release action through the support surface 33. Thus, when the clamp element 19 is in the clamping position with respect to the connecting end 12 and the actuating protrusion 30 and the support surface 33 are in contact with each other, that is, the actuating protrusion 30 is inserted into the recess 31. If present, the collet chuck 8 must be moved in the direction opposite to the insertion direction 34 with respect to the connecting end 12 inserted, so that the safety protrusion 36 is positioned at the stop shoulder 37.

The safety projection 36 is formed of a snap element as in the embodiment, and when assembled, it is very easy to assemble into the inner region of the stop shoulder 37 along the axial direction by snapping. In the structures shown in FIGS. 1 and 6, the safety protrusion 36 extending along the outer circumference of the actuating portion 24 extends radially outward while being inclined in the axial direction from the outer circumference of the actuating portion. It has a contour similar to a hook as shown in the longitudinal section view of 6 degrees. A space 47 is provided between the inclined portion 40 and the portion 44 of the operating portion 24 facing the inclined portion radially inwardly, whereby the inclined portion 40 is formed by the portion ( Can be bent as far inward in the radial direction as possible.

When inserting the collet chuck 8 into the housing cavity 4, the safety protrusion automatically bends when the safety protrusion 36 comes into contact with it through the stop shoulder 37. The inclined portion 40 is returned to the initial position by its elasticity characteristic and prevents the stop shoulder 37 from moving in this initial position.

The region disposed axially outward of the stop shoulder 37 of the housing 2 forms a guide 45, which actuates 24 which are located axially outward with respect to the safety projection 36. The side of the collet chuck is stabilized while surrounding the cylindrical portion 46 and guiding the axial movement of the portion. The safety protrusion 36 protrudes beyond the outer circumference of the cylindrical portion 46, and the inclined portion is narrowed in the intermediate space 47 so that the radially outer region of the inclined portion 40 is in line with the outer circumference of the cylindrical portion 46. It can be bent inward in the radial direction until it is arranged almost coaxially.

The safety protrusion 36 does not block when the collet chuck moves in the insertion direction 34. In any case of simple assembly and high load, the collet chuck is reliably controlled.

The radially inward facing side of the clamp portion 35 has a clamp edge 48, which extends linearly, preferably tangentially, with respect to the surface area of the connecting end 12 into which it is inserted. Can also be used under operating conditions. Accordingly, the clamp edge 48 is located along the regular polygonal line as a whole when viewed in the axial direction in the direction of the arrow IV. Since a high surface pressure is generated at the clamp edge at the clamping position, the clamp edge 48 is stuck or buried in the flexible wall at the connecting end. This type of clamp element is also effective for the coupling device without the safety protrusion 36, so that when the safety protrusion is added, a fairly strong bearing force can be safely transmitted to the housing 2, so that the collet chuck 8 is connected to the housing cavity ( There is no risk of falling out of 4).

Since the above-described coupling bridge 26 is linear in both radially inner and outer cross sections similar to the clamp edge 48 as shown in FIG. 2, the inner surface 49 and the outer surface of the coupling bridge 26 are linear. (50) is also located along the regular polygonal line in the axial direction. Thus, since the refraction process of turning the clamp element by forming the cross section in a rectangle or trapezoid can be made even with a small force, most of the applied force can be used as the original clamping force.

As shown in FIG. 2, it can be seen that the connection hole 10 is also formed in a polygon. The edges of these polygons are arranged in parallel along the axial direction.

The collet chuck 8 should be configured to withstand high stresses, but it is also important to be configured for simple mounting in the housing 2. For this purpose, other effective methods except safety protrusions and polygonal edges have been proposed. The method comprises a plurality of assembly auxiliary holes 54 open to the clamp element 19 inward and outward along the axial direction in the actuating section 24, as shown in FIGS. 2, 3 and 5. ) To provide. In the embodiment the assembling auxiliary hole 54 is linearly formed along the longitudinal axis 9 and formed in the shape of a drilled hole with a closed circumference, one or more being arranged in each clamp element 19.

The outlet 55 provided axially inward of the assembling auxiliary hole 54 of the operating part 24 opposes the axially outwardly facing back 56 of each clamp element 19 in which it is disposed. In the embodiment shown in FIG. 5, the recess 57 extends between the outlet 55 and the back 56, the radial volume of which becomes smaller due to the coupling bridge 26 located in this region. . The outlet 55 is located radially outward of each bend 23 arranged.

The assembling auxiliary hole 54 is fitted so that the assembling auxiliary member 51 of its cross-sectional shape can be fitted, and this auxiliary member is preferably formed in a pin shape as shown by the dashed-dotted line in FIG. Do. Prior to assembling the collet chuck 8 into the housing cavity 4, the assembly auxiliary member along the direction of the arrow 58 from the inlet 59 opposite the clamp element 19 to the assembly aperture hole 54 ( 51 is inserted and the backing 56 is pressed against the end 60 protruding from the outlet, the clamp element 19 disposed in the bend 23 is radially circumferentially around the bend 23 in the direction of the arrow 61. It will turn inside. In this way, while the collet chuck is mounted in the insertion direction 34, the clamp element can hold the collet chuck in an assembly position that is pivoted more radially inward compared to the conventional clamping position by the movement of its back 56, The collet chuck can be easily inserted into the housing cavity 4 through the stop shoulder 37 and the support surface 33 in this assembly position.

Since several assembling auxiliary members 51 are constituted by one device, all the clamp elements 19 can be held together in the assembly position by their corresponding members.

Assembling auxiliary holes may be provided for each clamp element, or one assembly auxiliary hole may be arranged in a plurality of clamp elements. In the latter case, the assembling auxiliary hole 54 is formed into a bow-shaped slit so that a part thereof extends along the circumference of the collet chuck. In addition, for example, the assembling auxiliary hole 54 may be formed as a groove-shaped recess formed in the outer circumferential surface of the operating portion 24.

Claims (12)

A coupling device for a pressure medium pipe (11) with a housing, the housing (2) having a housing cavity (4); An annular collet chuck 8 is movably held in this housing cavity, the collet chuck having a plurality of clamp elements 19 arranged continuously in the circumferential direction in an inner region of the housing cavity 4. ; These clamp elements are inserted into the housing cavity 4 through the collet chuck 8 to enclose the outer circumferential region of the connecting end of the pressure medium pipe 11, and these clamp elements are also arranged axially outward of these clamp elements so that the housing The actuating part 24 and the bent part 23 of the collet chuck 8 protruding from the cavity 4 are coupled to each other, and each clamp element 19 also has a radially outwardly actuating protrusion ( 30) is provided; This actuating protrusion protrudes into a recess formed in the housing wall of the housing cavity 4, the axially inner side of the region located further radially opposite the flexure 23 by the stop face 32, and The axially outer side is surrounded by the supporting surface 33, so that the actuating projection is the axially outer supporting surface when the collet chuck 8 moves axially outward in the direction opposite to the insertion direction 34 of the connecting end. Impinge on (33) such that the clamp element (19) pivots radially inward around the bend so that at the clamping position the clamp portion (35) of the clamp element (19) presses the outer periphery of the inserted end On the contrary, when the collet chuck 8 moves inwardly in the axial direction, the clamping element 19 pivots radially outwardly around the bend 23 so that the inserted end part is released. In the coupling device of a pressure medium pipe, the actuating section 24 is provided with a safety protrusion 36 projecting radially outwardly opposite each other in the axial direction in an area adjacent to the inner surface of the housing cavity 4. And the safety projection is enclosed by a stop shoulder (37) fixed to the housing in an axial outward direction. 2. The coupling device according to claim 1, wherein the operating portion (24) is provided with a plurality of safety protrusions (36), and these safety protrusions are arranged at equal intervals in the circumferential direction (20). A coupling device according to any one of the preceding claims, characterized in that the stop shoulder (37) is annularly formed and surrounds the actuating section (24). The stop shoulder 37 is formed by a side of a recess formed in the housing wall 21 of the housing cavity 4, in which the safety projection 36 protrudes at least partially into the recess. Combined device characterized in that. 2. The inserted connecting end 12 according to claim 1, wherein the clamp element 19 is in the clamping position with respect to the connecting end 12 and when the actuating protrusion 30 and the support surface 33 are still in contact. When the collet chuck 8 moves in the direction opposite to the insertion direction 34, the safety protrusion 36 and the stop shoulder () are brought into contact with the stop shoulder 37 disposed by traveling. 37) A coupling device, characterized in that an axial relative position is set between. 2. The engagement device according to claim 1, wherein the safety projection (36) is formed as a snap element, which can be arranged in the axially inner region of the stop shoulder (37) by snapping. 7. The safety projection (36) according to claim 6, wherein the safety projection (36) is formed to be inclined in the axial direction from the actuating portion (24) and projects radially outwardly, and the safety projection is a stop shoulder (37) during assembly of the collet chuck (8). And elastically bent radially towards the actuating portion (24) for a short time while passing through, and returning radially outward again after passing the stop shoulder (37). 2. The clamp portion (35) of claim 1, wherein the clamp portion (35) has a clamp edge (48) extending linearly, said clamp edge (48) being positioned along an imaginary polygon line as viewed in the longitudinal axis (9) direction. Combined device characterized in that. 2. The bent part (23) according to claim 1, wherein the bent part (23) is formed by a joining bridge (26) extending between the clamp element (19) and the actuating part (24), the joining bridge being radially inward and outward when viewed in cross section. All of which are formed in a linear contour, whereby both the inner surface (49) and the outer surface (50) of the coupling bridge (26) are located along an imaginary polygonal line. 2. The actuating part (24) according to claim 1, wherein the actuating part (24) has one or more assembly auxiliary holes (54) axially penetrating radially outward of the connecting hole (10) for receiving the pressure medium pipe (11) to be joined. In this assembling auxiliary hole, an outlet 55 is formed inside the axial direction, and the outlet is provided with a distribution 56 of the clamp element 19 located radially outward with the bent portion 23 interposed therebetween. It is disposed to face each other, and the assembling auxiliary member 51 can be inserted through this assembly auxiliary hole in the axial direction, and the collet chuck 8 is inserted into the insertion direction 34 using the assembling auxiliary member. The engagement device characterized in that the collet chuck is held in the assembled position by inserting and moving the back portion 56 of the clamp element 19 further radially inward towards the clamping position. 12. A coupling device according to claim 10, wherein an assembling auxiliary hole (54) of an actuating portion (24) is arranged for each clamp element (19). 12. The joining device according to any one of claims 10 and 11, wherein the assembling auxiliary hole (54) is formed in the form of a drill hole in which the circumference is closed.