HK1016365B - Device for the absorption of electrical noise - Google Patents

Description

Absorption device for electrical noise

Technical Field

The invention relates to a device for absorbing electrical noise, which is formed by an element made of a material that absorbs or suppresses noise and arranged around a cable.

Background

It is known that elements made of ferromagnetic material have long been used to reduce the electrical noise on wires (US-PS 3462715).

It has also been proposed to manufacture the element in two parts, made of ferromagnetic material, so that the element can be subsequently placed on the cable. In order to obtain good results as well, the two parts must be in contact.

This can be provided, for example, in the following manner (EP-A-452992): the two half-elements are housed in a casing, the bottom of which has elastic prestressing means to press the two magnetic elements.

Disclosure of Invention

The object of the invention is to provide a device for absorbing electrical noise which is simple in construction and which can be easily inserted into an element made of a material which absorbs or dampens the noise.

In order to achieve this task, the technical solution proposed by the present invention consists in that the means for absorbing electrical noise comprise a housing; the housing is composed of two half housings, in which a component made of a material for suppressing noise is respectively installed; in the assembled state, the two ends of the shell are respectively provided with a hole for passing through the cable; two elements made of the above-mentioned materials; the two elements are arranged in the two half shells; each having a semi-cylindrical groove; forming a closed cylindrical through hole for the cable in the state that the housing is assembled; a fastening device for fastening the components made of the above-mentioned materials in the respective housing half, wherein, for locking the housing in the closed state, at least one housing half is provided with a toothed web, which is in particular designed to co-act with teeth on the other housing half; the housing has two end faces and the fastening means of each housing half has a connecting piece which extends from one end face of the housing to the other and through the semi-cylindrical grooves of the two elements made of the above-mentioned noise-suppressing material.

The device can be installed on a cable to reduce noise by: a component made of a material that suppresses or absorbs noise is placed in the two housing halves and the housing halves are placed around the cable, for example by folding or plugging the housing halves together.

If the two elements are subsequently inserted into the two previously produced housing halves, the assembly can be carried out: two elements made of this material are first placed in the two housing halves and then locked together by means of a respective connecting element. The connector is passed through a semi-cylindrical slot made of ferromagnetic material, and the two halves of the sheath can then be closed around the cable.

The two housing halves can be connected to each other by snap-in means or otherwise, for example by placing a strip of adhesive tape, wire or the like around the outside of the housing.

In particular, in an improved design for the locking housing, a web with teeth is provided on one housing half to interact with the teeth on the other housing half. The housing can be locked in the fine-step position due to the fine teeth, thus counteracting manufacturing errors of the ferromagnetic material elements.

Such webs and teeth can also be provided on both longitudinal sides or end faces, the webs being arranged in particular in such a way that the two housing halves are aligned with one another.

The teeth may optionally be serrated, so that unintentional loosening is prevented.

The two housing halves can likewise be connected by an integral hinge, which is connected to one longitudinal side of the housing halves, respectively, in such a way that the two housing halves can be pivoted from the open position into the closed position.

Here too, a toothed web can be used for locking.

In order to achieve an angular alignment of one of the two elements made of ferromagnetic material, a rigid, in particular rounded, projection can be integrally formed on the bottom of the half-shell, which projection preferably extends over the entire length of the shell. The ferrite element can then be supported with its outer side on the projection and can be turned over to a certain extent about its longitudinal axis.

According to a development of the invention, the connection piece for fixing the ferrite element has a semi-cylindrical shape, so that in the closed state of the housing the connection piece forms a closed cylinder in the two housing halves, which cylinder completely covers the inside of the semi-cylindrical groove of the ferrite element. The longitudinal edges of the two half cylinders of the connecting piece are tightly attached to each other in a closed state, so that the connecting piece is fixed in position.

In order to fix the device to the cable, the invention proposes that at least one of the connecting elements forming the fixing device has an inward projection for fixing the cable. The projections can be made resilient. Likewise, both connecting elements, in particular both half-cylinders, can also have such a projection. This projection is preferably arranged approximately in the middle.

In a development of the invention, the connecting element can be inserted laterally into the two housing halves. But it is also possible to connect the connecting piece to the end face of the half shell by means of an integral hinge.

According to a further development of the invention, the housing halves are injection-molded around the element made of a noise-absorbing material.

According to a further development of the invention, the component is fixed in the housing halves by a force connection of the housing halves, in particular by the shrinkage of the housing material, against the component.

Further features, details and advantages can be taken from the following description of a preferred embodiment of the invention and the accompanying drawings, which are set forth in the description below.

Drawings

FIG. 1 shows a longitudinal section of the device of the invention in the closed state;

FIG. 2 shows a cross-section of the device of FIG. 1;

fig. 3 shows a longitudinal section through one half of the housing in the open state;

FIG. 4 shows a side view of the device corresponding to FIG. 1;

fig. 5 shows a plan view of the second embodiment without the insertion of elements;

FIG. 6 shows a section of the type of construction shown in FIG. 5 corresponding to that of FIG. 3;

FIG. 7 shows a cross-section of the device of FIG. 5 taken along line VI-VI of FIG. 5;

FIG. 8 shows an end view of another construction;

FIG. 9 shows a partial cross-section of one half of the housing in another configuration;

FIG. 10 shows a top view of a modified housing half;

FIG. 11 shows a top view of the connector of the housing half of FIG. 10;

fig. 12 shows a top view of a half of the housing according to fig. 10 in another embodiment;

fig. 13 shows a simplified view corresponding to fig. 12 of another embodiment;

figure 14 shows an enlarged partial cross-sectional view of the locking device between the two housing halves.

Detailed Description

Fig. 1 shows the device according to the invention in an operative state, wherein the cables to be suppressed from electrical noise are still to be described. The device comprises a housing 1 formed by two housing halves 2, 3. The two housing halves 2, 3 are joined in such a way that their open edges overlap one another. The joined housing thus has one through hole 4 aligned with each other at both end faces thereof.

In the half-shell 2, an element 5 made of ferromagnetic material is placed, the length of which is approximately equal to the internal length of the half-shell 2. The element 5 is made of ferromagnetic material, hereinafter referred to as ferrite element, and has a semi-cylindrical slot 6 on one side of the element, which slot extends over the entire length of the ferrite element 5. In the assembled state, the two ferrite elements 5 are arranged opposite one another in such a way that the two semicylindrical slots form a cylindrical through-opening, as shown in fig. 1 and 2. Wherein two adjacent interfaces overlap each other, so that a closed ferrite is formed around the through hole, through which the cable passes.

Referring now to fig. 3, on the two half shells 2, 3 the front end 8 forms, by means of an integral hinge 10, a connecting piece 9, which connecting piece 9 has the shape of a half cylinder, in other words a half tube 11. Approximately at the longitudinal midpoint of the connecting piece 9, an elastic projection 12 is formed, which projects into the groove formed by the half-tube 11 and has two individual small teeth 13.

The second housing half 2, which is situated behind the housing half 3 visible in fig. 3, is likewise hinged to the housing half 3 by means of an integral hinge, and the second housing half 2 also has a connecting piece 9 hinged to an integral hinge 10 in the same manner.

Two ferrite elements 5 are now placed in the two halves of the open housing 2, 3 in the position shown in fig. 3, i.e. one ferrite element 5 is placed in each half of the housing, with the slot 6 facing upwards, i.e. towards the open sides of the two halves 2, 3. The bottom of one of the housing halves 2 has a rounded projection 15 extending in the longitudinal direction of the housing, on which projection 15 the respective ferrite element 5 rests, as shown in the top part of fig. 2. It can also be tilted a little by a certain rolling of the top of the protrusion 15. The two latching connections 9 are then closed until they are located and snap into the slots 6 of the ferrite element 5. The housing is then folded closed by the two housing halves about the hinge 14. On the long side of the housing corresponding to the hinge 14, the half-housing 3 has a web 16 provided with a tooth or a row of teeth on its inner side. Wherein the web 16 is designed such that its inner side is approximately flush with the outer side of the opposite half shell. The second half-shell, the upper half-shell in fig. 2, has a row of teeth 17 in this position, as shown in fig. 4. These teeth are serrated so that it is not possible to release the connecting plate 16 without tools. When the two housing halves 2, 3 are closed, the two housing halves are pressed against one another to such an extent that the two ferrite elements 5 rest against one another at their parting plane 7. In this position, the web 16 is locked relative to the teeth 17. The connecting plate 16 has three connecting strips 16a, b and c, which form the connecting plate 16 on the housing half 3. The free ends of which are integrally connected by a cross bar 18. The web 16 is configured to be located directly adjacent an edge 19 of one half of the housing 3 opposite the other half of the housing 2. This prevents the lock from springing back.

If the device according to the invention is brought together around a cable, the projections 12 rest against the cable sheath, so that the device is fixed to the cable in its entirety by a force connection.

In the locked condition of the housing, the longitudinal edges of the interface of the connecting element 9 are flush with each other.

In the illustrated embodiment, the two housing halves are hinged by an integral hinge 14. The two housing halves can also be made as separate parts and can be fastened, for example, in such a way that one housing half 3 has a respective connecting plate 16 on both longitudinal sides and the other housing half has a corresponding toothing 17 on both sides. This also achieves that the housing is locked into the closed state.

The structural patterns shown in fig. 5 to 7 are different from the foregoing structural patterns, and only the different portions will be described below.

Two transversely extending connecting pieces 25 are formed on the housing halves 22, 23, respectively, a short distance behind the end wall 24, the two pairs of connecting pieces 25 being used to compensate for manufacturing tolerances of the components placed in the housing halves. In this design they replace the centering projections 15 provided on the bottom of one or both housing halves in the design according to fig. 1 to 4.

The end walls 24 of the two housing halves 22, 23 on one side are each formed by an integral hinge 26 with a groove 27 which is substantially U-shaped in cross section. Such a groove serves to fix the element and for this purpose is turned over about the hinge 26. In which the end face 28 opposite the hinge 26 is locked in the housing, details not being shown in the figure.

The bottom of the groove 27 has two projections 29 projecting into the interior of the groove 27 where they are used to secure the cable.

On the longitudinal side of the integral hinge 30 connecting the two half-shells 22, 23, the half-shell 22 has a web 31 provided with teeth or ribs on its inner side.

The corresponding side wall of the other half of the housing 23 likewise has saw-toothed teeth 32 which cooperate with the teeth on the inner side of the web 31.

The teeth 33 on the inner side of the web 31 can be clearly seen from the side view of fig. 6 showing the web 31. The serrations 33 can also be seen in fig. 7.

Fig. 8 shows a further embodiment of the housing formed by the two housing halves 34, 35. The housing formed by the two housing halves 34, 35 is injection molded around the element made of noise-absorbing material placed in a holder, the shrinkage caused by this manufacturing method shrinking the housing a little so that the housing adheres non-rigidly to the outside of the element 5. The tolerances that can occur when the component 5 is made of ferrite material are compensated in this manner of manufacturing the two housing halves, so that a simple latching 36 allows sufficient fastening. In the embodiment of fig. 8, the inner side of the semicylindrical groove 6 of the element 5 can also be covered with a layer of plastic, which is produced together during the injection molding process, but this is not necessary.

In the half-shell shown in fig. 9 for receiving an element made of a material which dampens or absorbs electrical noise, an approximately elastic hook 42 is formed on the side wall 41, which hook forms a barb 43 in the region of its free end. The hook 42 can be used, for example, to fasten the housing 40 to a printed circuit board or to a separate component in such a way that the hook 42 is inserted through a hole or a recess. On the corresponding side wall, not shown in fig. 9, there is a correspondingly shaped, symmetrically arranged hook 42, so that the fixing can be achieved by simple snapping-in. The distance between the bottom edge of the bottom half of the housing 40 and the barb 43 is determined by the general thickness of the printed circuit board.

Fig. 10 and 11 show a detail of a further embodiment in which locking teeth 45 for locking the housing halves 44 are provided in the cutouts 46 in the longitudinal side walls of the housing halves 44. In this case, the webs provided on the other half of the housing are configured to engage in the cutouts 46. The edge of this web slides into the groove 47 formed laterally by the cutout 46, so that not only is a secure guidance of the web ensured when the housing is closed, but also a jamming behind the web in the closed state of the housing is prevented.

On the end wall 49 of the half shell 44 is again a semi-circular hole 50 for the passage of the cable on which the half shell is to be fixed.

The bottom 48 of the half-shell has two ribs 51 extending perpendicular to the line connecting the holes 50, which ribs are used to counteract errors in the ferrite core.

A plurality of projections 52, 53 are provided in the semicircular opening 50 of the end wall 49, wherein the central projection 53 can be shaped like a web.

The ends of the respective end faces of the transverse connection element 9 are co-operated with these projections 52, 53 in accordance with fig. 11. Fig. 11 shows such a transverse connection 9 which is of a construction similar to the connection 9 of the construction of fig. 3, i.e. in the form of a groove or a half-tube. The connecting element has, in its end-side region, a hole 54 which is identical in shape and size to the connecting plate-like projection 53 in the semicircular hole 50 of the half-shell 44.

Notches 56 are formed in both longitudinal edges 55 of the member and cooperate with the locking projections 52, the notches 56 not requiring a line of engagement through the plane of the channel member.

After a ferrite element has been inserted into the housing half 44, the connection element 9 shown in fig. 11 is pushed into the semicircular opening 50, where it is guided and fixed by the cooperation of the projections 52, 53 and the opening 54 or the cutout 56.

Fig. 12 shows the other half shell 57, which corresponds to the half shell 44 of the design shown in fig. 10 and 11, except that the base 58 of the half shell has a longitudinally extending rib 59 instead of the two ribs 51. The cross-sectional shape of the rib 59 corresponds approximately to the cross-sectional shape of the rib 25 of fig. 6, i.e. it is approximately triangular, possibly with a rounded upper edge.

In all the embodiments shown, the two housing halves are provided with elements made of a noise-absorbing material and are folded around the line. Wherein the webs engage more or less in the teeth of the other piece, depending on the actual size of the elements to be placed. These elements may be slightly different sizes due to errors. I.e. in this case the housing can be opened easily with respect to the situation shown in fig. 1, 2 and 4, but in any case it must be ensured that the parting surfaces 7 of the two elements abut against each other.

In the simplified embodiment shown in fig. 13, the two longitudinal sides of the ferrite core 5, i.e. the two sides of the half-cylinder inner bore, bulge slightly, in particular on the side of the housing which is open. The housing has a recess on the open side. In this way, the ferrite core 5 can be fixed in the housing relatively easily, in particular before snapping, which is particularly important for placing and handling the sound-absorbing material.

Fig. 14 shows an enlarged partial cross section of a locking device similar to the version of fig. 11 and 12. The locking tooth 45 arranged in the groove 46 is arranged in this case on the outside of a spring-back web 60. If the connecting element 31 with teeth 33 is now inserted into the groove 46, the web 60 springs back somewhat and therewith grips firmly with the connecting element 31.

A screwdriver or another tool may be used to press against the outside of the connector 31 during opening, thereby causing some inward deformation of the web 60.

Claims (9)

1. The absorption device of electrical noise includes:

1.1 a housing (1);

1.1.1 the housing is composed of two housing halves (2, 3; 34, 35) which are each used for mounting an element (5) made of a material that suppresses noise;

1.1.2 in the assembled state, the two ends of the housing each have a hole (4) for passing a cable;

1.2 two elements (5) made of a material that suppresses noise;

1.2.1 the two elements are arranged in two housing halves (2, 3; 34, 35);

1.2.2 the two elements each have a semi-cylindrical groove (6);

1.2.3 the groove forms a closed cylindrical through-hole for the cable in the assembled state of the housing (1);

1.3 a fixing device for fixing the above-mentioned element (5) made of a material that dampens noise in the respective housing half (2, 3; 34, 35), characterized in that, for locking the housing in the closed state, at least one housing half is provided with a toothed web (16) which is designed to co-act with the teeth (17) on the other housing half (2);

1.4 the housing has two end faces, and the fastening means of each housing half (2, 3; 34, 35) has a connector (9) which extends from one end face to the other end face of the housing (1) and through the semi-cylindrical grooves (6) of the two elements made of the above-mentioned noise-suppressing material.

2. Device according to claim 1, characterized in that the two housing halves (2, 3) are connected to each other at one longitudinal side of the housing by means of an integral hinge (10).

3. A device according to claim 1 or 2, characterized in that, for aligning the element (5) made of said noise-suppressing material, a rounded projection (15) is formed at the bottom of the housing half (2), which projection extends in the longitudinal direction of the housing (1).

4. Device according to claim 1 or 2, characterized in that the connecting piece (9) has the shape of a half-pipe (11).

5. A device as claimed in claim 1 or 2, characterized in that the connecting element (9) has a projection (12) for fixing the housing (1) to the cable.

6. Device according to claim 1 or 2, characterized in that the connecting piece (9) is connected to one end face (8) of the housing halves (2, 3) by means of a further integral hinge (10).

7. Device according to claim 1 or 2, characterized in that the connecting piece (9) is inserted laterally into the housing halves (2, 3).

8. Device according to claim 1 or 2, characterized in that the housing halves (34, 35) are injection-molded around the element (5) made of a material that absorbs noise.

9. Device according to claim 1 or 2, characterized in that the element (5) is fixed in the housing halves (34, 35) by shrinkage of the housing material.