DE7338306U - Electromagnetic relay embedded in insulating material - Google Patents

Description

• · ■ ·

HANS SAUER '' ^: · ''.''·' · '" Κ »O #! T # nhof« n b. Min * · «

Tel «« 5-2SI5J

G 73 38 3o6.9 73 / 1o / 1

New description pages 1 to 12 replace the original description pages 1 to 11

Electromagnetic relay embedded in insulating material

The innovation concerns an electromagnetic relay embedded in insulating material, the contact or coil connections of which emerge from the relay body on one side.

Such a relay is known from German utility model 7 144 972, for example. In particular, in this known relay a housing cap surrounding the relay body is provided, which is covered with a base plate on the side on which the connections emerge from the relay body. The space between the housing cap, base plate and relay body is filled with potting compound. As Fig. 1 shows, it is necessary in such a relay to provide an insulating intermediate layer 3 or an insulating spacer 4 between the housing cap 1 and the relay body 2 so that the relay body 2 is somewhat fixed within the housing cap 1 and at the same time also a safe electrical Insulation between the housing cap 1, which can be made of metal, and live parts of the relay, such as the contact terminals 5, is achieved. A more extensive, exact definition of the relay body within the housing cap, which would be desirable from a structural and electrical point of view, could possibly be achieved by appropriate dimensioning of the insulating intermediate layer 3 or the spacer 4. For example, these parts would have to be made thicker. However, measures of this kind cannot be carried out without further ado, because they impair the flow of the potting agent 7 and thus no uniform, bubble-free embedding of the relay body 2 on all sides would be achieved. It also turns out to be in FIG. 1

7338306 17.0475

«Γ · nsiäis as r.sshtsilig * that the sb ^ ne base plate 8 in a separate operation »after the relay body 2 has been encapsulated with potting agent 7» must be connected to the unit obtained in this way.

Furthermore, from the German Auelegeschrift 2 o49 o93 a relay carrier and connection plate for a switching arrangement is known A protective tube contact and other electrical circuit elements are arranged in an elongated central opening in the plate are. This arrangement is cast around in a mold. The protective tube contact mounted on the relay carrier and the electrical circuit elements mentioned are within this operation the Fons set exactly because the relay carrier plate on their Edge of the shape is held in the desired position.

The relay is thus given a defined arrangement within the embedding compound. However, this can only relay _r perform at which the terminals on two sides AU5 exiting the relay body, and are also aligned exactly. Relays, the contact or coil connections of which are led out of the relay body on one side, cannot, however, be embedded in insulating material in a defined position in this way.

The innovation is now based on the task of creating a relay of the type mentioned, which, while avoiding additional design effort, in industrial mass production with regard to its position within narrow tolerances and nevertheless can be easily embedded in insulating material.

According to the innovation, this object is achieved in that the relay surrounded by a housing cap and in this by nose-like projections, one covering the housing cap, with an injection

7338306 04/17/75

Aligns the opening for the base plate provided with the insulating material is, and that the space between the relay body, the housing cap and the base plate is filled with insulating material »Furthermore, the task on which the innovation is based is also solved by this» that the relay is surrounded by a housing cap, that the space between the relay and the housing cap with insulating material is sprayed out, and that the connections of the relay through the embedding material are sealed, or that the relay is encapsulated with insulating material, and that substantially uniform distances are present between the relay body and the plastic casing. The relay, which is surrounded by a housing cap, is used for embedding in Isolierstoff ml », c'är housing cap in a recess of a first Mold half inserted. The free ends of the contact or coil connections become the injection mold during the closing process detected by located in a second half of the mold, provided with substantially conical Einführo ££ nüngen holes and aligned in the order of these holes. The coil or contact connections and the bores are in their cross-section coordinated so that the holes through the connections during the embedding process through which the space between the relay and the housing cap and the second mold half is filled with insulating material for which the embedding material is sealed. If no housing cap is provided, the relay is to be embedded in insulating material in a recess a first mold half arranged such that substantially uniform distances between the relay body and the recess are present and the free ends of the contact or coil connections during the closing process of the injection mold through in a second Mold half located, provided with essentially conical insertion openings detected and in the order these holes are aligned. The coil or contact connections and the bores are so on top of each other in their cross-section matched that the holes are sealed by the connections for the embedding material.

7338306 04/17/75

These measures result in relays which are embedded within a housing cap or which is made of insulating material are exactly positioned. The advantage here is that, compared to the relay cited at the beginning, insulating material parts are used as spacers be spvvvrt and the completely embedded relay is obtained in a single operation. The exact positioning the relay means that the relays obtained have a particularly uniform quality in terms of their electrical values distinguish. As a result of the defined geometric relationships, for example, constant creepage distances between Contacts and housing cap realized so that the dielectric strength of the relay is also fixed within a narrow tolerance range.

For embedding in insulating material, one proceeds with the relays, in which an alignment of the relay body within the housing cap takes place by nose-like projections of the base plate, preferably in such a way that ^ tÜn the housing enclosed relay in a The recess of a first mold half rests and the free ends of the contact or coil connections pass through openings in the base plate protrude, during the closing process of the injection mold through located in a second mold half, with essentially bores provided with conical insertion openings and aligned in the order of these bores, and that the coil or contact connections and the holes in their cross-section are matched so that the holes through the connections during the embedding process for the embedding material are sealed.

This achieves that contact or coil connections that are conditional can be slightly bent by previous manufacturing steps due to the conical insertion openings in the Second mold half located bores are safely detected and also aligned in the order of these bores. Before-

7338306 04/17/75

Drawn refinements of the innovation consist in that the base plate is essentially rectangular and on opposite end areas, transversely to their longitudinal extent extending and protruding into the housing cap has nose-like projections, each of which has the spacing set between the relay body and the Gshäusekappe at least in one direction and that the base plate on the Relay body facing side to define a uniform distance of the relay body from the housing cap in a further direction with one adapted to the contour of the relay body Profile part is provided. This enables the relay to be precisely positioned within the housing cap in a simple manner guaranteed.

According to a further refinement of the innovation, it is provided that that on the base plate, to achieve a uniform support on a circuit board, on the remote from the relay body Side in the area near the edge nose-like projections of the same height are formed. In addition to a secure support of the relay achieved one hereby that there is such a large air gap between the base plate of the relay and the circuit board that when soldering of the relay in a manner known per se at the contact or coil connections, no solder will rise as a result of capillary action can.

If a base plate is completely dispensed with, know be provided that the second mold half has nose-like projections which protrude into the first mold half and each at least the distance between the relay body and the housing cap or the relay body and the recess in the first mold half set in one direction. The relay body learns so, essentially in the same way as through the nose-like Projections of the base plate, until the end of the embedding process, a perfect alignment within the Housing cap.

7338306 04/17/75

Furthermore, it can be useful that projections are formed on the relay body or at least two side slides guided in the first mold half are provided to hold the relay body in the desired position during the embedding phase to spatially fix the relay body relative to the housing cap or the recess in the first mold half . For the same purpose according to further embodiments of the innovation, it is provided that the relay body is provided with at least two guide pins _f which engage into corresponding openings in the housing cap, that at the bottom of the recesses located in the first mold half, at least two projections of the same height to define a defined distance of the relay body are provided, or that at least two equally high projections are formed on the relay body, which engage in two corresponding blind holes in the bottom of the recess located in the first mold half to fix it spatially. Through these measures, provision is made that the relay body is aligned independently of the provided on the base plate or the second mold half η adjusting means in dec recess of the first mold half or in the housing cap.

In order to achieve a uniform support of the relay on a circuit board, the innovation is based on another embodiment provided that the second mold half contains depressions through which nose-like projections of the same height are formed from the embedding material on the relay underside in the region near the edge.

Furthermore, it is an embodiment of the innovation that a relay at least partially surrounding ferromagnetic, embedded with the relay in insulating material and completely with the iturer outside Shielding cap covered with insulating material is provided. This gives relays that are both electrically isolated and magnetically

are shielded from the outside. In the event that it is a reed relay, there is a disruptive mutual influence prevented and also used the otherwise lost leakage flux to increase the efficiency of the relay.

To make it easier to cast around the shielding cap during the embedding process is provided according to a further embodiment of the innovation that the shielding cap is essentially cuboid and is provided on at least one side with openings suitable for the passage of the insulating material.

The innovation is shown below with reference to in the drawings Embodiments explained in more detail.

In detail shows

Fig. 2 is aligned by means of a base plate in the housing cap Relay,

Fig. 3 is a perspective view of the base plate used in Fig. 2,

4 shows a relay embedded in insulating material without a base plate,

5 shows a relay held in position with the aid of sideshifts during the embedding phase,

6 shows a relay with nose-like projections on its relay body are molded,

Fig. 7 an embedded in insulating material, «? Relay that has neither a housing cap nor a base plate ,

7338306 17.G4.75

8 shows a relay provided with a ferromagnetic shielding cap, and FIG

9 shows a section through the relay shown in FIG. 8 along the line IX-IX

The relay shown in Fig. 2 is surrounded by a housing cap 1 and by nose-like projections 6, one of the housing cap 1 covering base plate 8 aligned. For this purpose, as FIG. 2 clearly shows, the thickness of the nose-like Projections 6 chosen so that the space between the housing cap 1 and the relay body 2 is filled by them. Further Details of the base plate 8, such as an injection opening 9 for the insulating material and openings 1o for contact 5 or coil connections 11 can be seen from FIG. 3. The substantially rectangular base plate 8 also has a profile part 12 which is adapted to the contour of the relay body 2 and is to achieve a uniform support on a The circuit board is provided with nose-like projections 13 in the area close to the edge on the side facing away from the real body. For embedding in insulating material 7, the relay enclosed by the housing is received in a recess of a first mold half. The free Ends of the contact 5 or coil connections 11, which pass through the openings 1o, the diameter of which is about two to three times as large as that of the connections 5, 11, protrude through the base plate 8 during the closing process of the injection mold through conical insertion openings located in a second mold half provided holes safely detected and aligned in the order of these holes. This is a through previous manufacturing steps caused slight bending of the connections 5, 11 compensated again without additional manufacturing effort. aside from that the holes are made through the connections during the embedding process 5, 11 sealed for the insulating material. The embedding of the housing cap 1 exactly through the base plate 8

7338306 17.0A.75

directed relay body 2 takes place, for example, in an injection molding process. For this purpose, the insulating material 7 is passed through the injection opening 9 injected so that the space between the rice body 2, the housing cap 1 and the base plate 8 are completely filled is. The connections 5, 11 are conical on the root side Bumps 14 embedded from insulating material. After the relay body 2 through the nose-like projections 6 and the profile part 12 of the base plate 8 is fixed in three dimensions, in this exemplary embodiment of the invention, the The intermediate insulating layer 3 still shown in FIG. 2 is omitted.

In the case of the relays shown in FIGS. 4 and 5, the relay body is 2 also arranged in a housing cap 1 and embedded in insulating material 7 therein. The housing cap is on one 1 covering base plate 8 is omitted. For embedding in insulating material 7, the relays according to FIGS. 4 and 5 are in a recess a first mold half 26 is arranged. When the two-part mold is closed, the free ends of the contact or coil connections become 11, as already described, by conical insertion openings located in a second mold half 17 15 provided holes 16 detected and aligned in the order of these holes 16. At the same time, the holes 16 are through the connections 5, 11 sealed for the insulating material. In the embodiment shown in Fig. 4 are to determine the distance of the relay body 2 from the inner walls of the housing cap 1, before leaps 18, 19, 2o formed in such a way that they abut on the one hand against the inner wall of the housing cap 1 on the other hand the flow of the Do not interfere with insulating material 7. If an insulating intermediate layer 3 is used, it is in the area of the projections 19 provided with a recess through which the projections 19 protrude. As an alternative to the projections 18, 19, 2o serving to align the relay body 2, the second half of the shape is nose-like Projections are provided which protrude into the first mold half

- Io -

7338306 17.B4.75

-Io -

and · each determine the distance between the relay body 2 and the goose cap 1 in at least one direction. The nasal V & r "prüng" d ·? When the relay is completely embedded, the second mold halves leave trough-like depressions 21 between the contact connections 11 and the housing cap 1, so that particularly long creepage distances are obtained and thus a high insulation strength is achieved. In contrast, in the relay shown in FIG. 5, at least two side slides 22 guided in the first mold half 26 are provided for the exact spatial definition of the relay body 2, which hold the relay body 2 in the desired position during the embedding phase. In addition, two projections 23 of the same height are formed on the relay body 2, which, in order to fix it spatially, engage in two corresponding blind holes 24 in the bottom of the recess 27 located in the first mold half 16. After the embedding process, the projections 23 protruding from the relay are cut off. In the relays shown in FIGS. 4 and 5, the side on which the connections 5, 11 emerge from the relay body is formed by the second mold half 17. Through the conical insertion openings 15 in the second mold half 17 the connections 5, 11 during the embedding process are surrounded conically at their exit points with potting material 7, for example thermoplastic material, whereby the creepage distances are lengthened. Furthermore, the second mold half 17 contains depressions through which nose-like projections 25 of the same height from embedding material are formed on the relay underside to achieve a uniform support of the relay on a circuit board in the area near the edge.

The relays shown in FIGS. 6 to 9 do not have a housing cap embedded directly in insulating material 7. For this purpose, the relay body 2 is in a recess 27 of a first mold half 26 in such a way arranged that there are essentially uniform distances between the relay body 2 and the recess 27. When shown in Fig. 6

- 11 -

7333306 April 17th «

• ■ - * Λ

shown relays this is achieved by the fact that the relay body 2 two projections 28 of the same height are formed, which contribute to its spatial Fixation in two corresponding blind holes in the bottom of the recess 27 located in the first half of the mold 26. As shown in FIG. 7, the relay body 2 can also be fixed spatially by means of projections 39 of the same height take place in the second mold half 17.

As in the exemplary embodiments already described, are also in the relay shown in Fig. 6 to Fig. 9, the free ends the contact 5 or coil connections 11 through insertion openings 15 detected by holes 16 in the second mold half 17 and in the Aligned order of these holes * Ports 5, 11 and holes 16 are matched to one another in their cross-section so that the holes 16 for the Embedding material 7 are sealed. The embedding material 7 is thermoplastic and is through one in the second Mold half 17 (Fig. 6) or in the first mold half 26 (Fig. 7) located channel 29 is injected. When you open the form, it will completely embedded relay ejected by ejector 3o in the second mold half 17 (Fig. 6).

Compared to the relay shown in Fig. 6 and Fig. 7, this is shown in Fig. shown by a ferromagnetic with embedded in insulating material 7 Shield cap 31 surround. The shielding cap 31 is included also completely covered with insulating material 7 on its outside. The embedding of the relay body 1 and the sheathing of the shield cap

31 are carried out in one work step, so a defined spatial Distance of the relay body 2 from the shielding cap 31 on the one hand and a uniform sheathing of the shielding cap 31 with Insulating material 7, on the other hand, are guaranteed, are guide bolts

32 are provided which penetrate the housing cap 31 in bores and engage in corresponding openings in the injection mold. So-

- 12 -

7338306 04/17/75

ΊΡ,

if it is a reed relay, as shown in FIG. 9, the distance between the shielding cap 31 and flux-conducting components, such as the pole pieces 33 or a permanent magnet 34 selected greater than the distance between the shielding cap from the clamping point 38 of the movable contact tongue 36 and thus the flow conditions for the relay are optimized. In this way one achieves that the force with which the contact tongue 36 arranged within the coil former 35 rests against the fixed mating contacts 37, enlarged and so that the contact reliability is increased and the contact resistance is reduced. Since the shielding cap 31 on its outside also is completely surrounded by insulating material 7, on the one hand, a separate grounding of the shielding cap 31 can be dispensed with, on the other hand it is impossible for the cap to accidentally make contact with an adjacent component or something else live part takes place.

12 claims for protection
9 figures

7338306 i7.0i.75

Claims (12)

G 73 38 3o6.9 "73 / 1O / 1 New protection claims 1-12 (replace the original protection claims 1-17) 1. Electromagnetic relay embedded in insulating material, the contact or coil connections of which emerge from the relay body on one side, characterized in that the relay is surrounded by a housing cap (1) and in this by nose-like projections (6), one of the housing cap (1 ) covering, with an injection opening for the insulating material (7) provided base plate (8) is aligned and that the space between the relay body (2), the housing cap (1) and the base plate (8) with insulating material (7) is filled out. 2. Electromagnetic relay embedded in insulating material, the Kc.itakt- or coil connections of which emerge from the relay body on one side, characterized in that the relay is surrounded by a housing cap (1), that the space between the relay and the housing cap (1 ) is injected with insulating material (7), and that the connections (5), (11) of the relay are sealed by the embedding material. 3. Electromagnetic relay embedded in insulating material, the contact or coil connections of which emerge from the relay body on one side, characterized in that ⁴ the relay is encapsulated with insulating material, and that there are essentially uniform distances between the relay body (2) and the plastic casing 4. Embedded in insulating material electromagnetic relay according to claim 1 , characterized in that the base plate (8) is essentially rectangular and at opposite - 14 - 7338306 04/17/75 overlying end areas / transversely to their longitudinal extent extending and protruding into the housing cap (1) has nose-like projections (6), which in each case the distance between the relay body (2) and the housing cap (1) at least set in one direction. 5. Electromagnetic relay embedded in insulating material according to claim 1 or 4, characterized in that the base plate (8) on the side facing the relay body (2) to define a uniform distance between the relay body (2) and the housing cap (1) in a further direction with one of the contour of the relay body adapted profile part (12) is provided. 6. In insulating material embedded electromagnetic relay, according to one of claims 1,4 or 5, characterized in that on the base plate (8) to achieve a uniform support on a circuit board on the side facing away from the relay body (2) in the randnahan area nose-like projections (13) are molded to the same height. 7. In insulating material embedded electromagnetic relay, according to one of claims 2 or 3, characterized in that the relay body (2) projections (18), (19), (2o) for determining its distance from the inner walls of the housing cap (1) is integrally formed are. 8. Xn insulating material embedded electromagnetic relay, according to claim 2, characterized in that for the spatial definition of the relay body (?,) This is provided with at least two Fi.'hrun.gs- bolts (24) which in corresponding openings in the housing cap (1) intervene. 9. In insulating material embedded electromagnetic relay, according to claim 3, characterized in that the relay body (2) - 15 - 7338306 04/17/75 T ^ gTii_rt-2t £ iis z-zi. c> slightly high pre ~ prür * ~? (? 6) * u iieKssn spatial definition opposite the plastic coating are molded. 10. Electromagnetic relay embedded in insulating material, according to one of claims 2, 3 or 7 to 9, characterized in that nose-like projections (25) of the same height from the embedding material on the relay underside to achieve a uniform support of the relay on a circuit board in the area near the edge (7) are molded. 11. Insulating material embedded electromagnetic relay according to any one of the preceding claims, characterized in that a relay is at least partially surrounding the ferromagnetic, embedded in insulating material with the relay (7) and completely on its outer side with insulating material (7) covered shielding cap (31) is provided. 12. An electromagnetic relay embedded in insulating material, according to claim 11, characterized in that the shielding cap (31) is essentially cuboid and is provided on at least one side with openings suitable for the passage of the insulating material (7). 7338306 17.0475