DE7309528U - COIL IN PARTICULAR EXCITER COIL FOR LYE PUMPS - Google Patents

Description

Coils, in particular excitation coils for lye pumps

The innovation relates to a coil, especially one
Excitation coil for Lauge.npumpen, the coil winding of which before an overmolding for the production of an insulating cover in one of them
Strength corresponding distance to the respective wall of the injection mold is stored in this.

In order to use a known version (DT-Gbm 7 118 519) of an in
In order to be able to ensure good access to the potting compound to be filled to the coil winding from all sides, the inner walls of the lost casting mold have several thin-walled ones protruding into the casting space
Provided webs or ribs on which the bobbin rests and which are embedded in the potting compound in the solidified state. Similar webs or ribs would then also have to be provided on a reusable injection mold if the coil winding is to be provided with an overmolded insulating cover. Those that remain in the insulating cover after the hardened, encapsulated coil has been loosened and correspond to the webs or ribs
However, notches result in weak points in the insulation,
since dirt and moisture can settle in them and
intensified to the formation of leakage currents and thus to short circuits
to lead.

Be a known wrapping process for electrical wound capacitors (DT-OS 1 554 811) are in an injection mold
the insertion of an electrical component separate spacing

73C9528-7.6.73

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Holders inserted, which are intended to prevent the parts to be encased from shifting in the event of one-sided injection pressure. In order to ensure a perfect connection between the spacers and the remaining part of the To achieve coating with thermoplastics, the injection compound is heated to the highest possible temperature in order to create a VerschwelQuny? to achieve the plastic parts.

According to the innovation, a coil of the type mentioned at the outset can be used for a long time with a homogeneous, even when used in moist media Overmolded insulation sheath that ensures reliable insulation can be achieved in a simple manner that the 'produced without a bobbin coil of ring-like Clamping elements is encompassed, the arrangement and wall thickness of the respective thickness of the Iaolierumhüllung to be encapsulated is equivalent to.

Simply constructed injection molds can thus be used for such coils can be used, as special webs or ribs formed on their inner wall are omitted. The insulating cover has a homogeneous, smooth surface since there are no notches in the die corresponding to the webs or ribs of the injection mold finished insulating cover occur. In that the clamping elements encompassing the bobbin are also used as spacers at the same time are, both a shape stiffening of the coil winding is achieved in an advantageous manner as well as each desired thickness of the insulating jacket guaranteed. The ring-like clamping parts are expediently designed to be elastic and interrupted by a respective slot opening in such a way that the clamping elements over the respective part of the bobbin can be slipped over and rest against this self-tightening.

A preferred embodiment of the innovation is characterized by that a material is provided for the clamping elements, the melting temperature of which is lower than the maximum Temperature of the injection molding compound filled into the injection mold such that

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that the ring-like tensioning elements are loosened in their outer layer by the injected molding compound. Appropriately Plastic is used as the material for the clamping elements and in particular for the clamping elements and the injection molding compound, each a thermoplastic with correspondingly different ones 'TcIüpcrä. "ÖUrwer ~ o6ii VOrgoSSIiSIi · -üsdurcll XSu STTSiCllbS.!" j ds.2 d.is The coating of the bobbin lap, which is integrated from injection molding compound and tensioning elements, is completely homogeneous and has a closed surface forms and you can thus ensure a particularly safe insulation over a long period of time without it requires a particularly increased heating of the spray compound during spraying. A polyamide has proven to be the plastic material or a polyacetal proved to be particularly advantageous.

The innovation is explained in more detail below using an exemplary embodiment in the drawing. Therein show in schematic Depiction:

FIG. 1 shows a bobbin winding manufactured without a bobbin in front of άβια 3yxi "tZ6ii

FIG. 2 shows a finished, overmolded body according to FIG. 1

The same parts are provided with the same reference symbols in the figures.

Figure 1 shows a double-U-shaped manufactured without a bobbin Coil winding 1 of an excitation coil for caustic pumps. Terminal lugs 8, 9 are connected to the winding ends 10, 11 of the excitation coil. Over each side of the bobbin wiok 1 each a ring-like tensioning element 2-5 is self-tensioning and slipped around the coil lap 1 in a shape-stiffening manner; to the tensioning elements 2-5 are inherently elastic and matched to the cross-section of each side of the bobbin 1 as well interrupted by a slot opening 6 or 7, such that the clamping elements 2-5 over the respective part of the bobbin 1 can be slipped over and rest against this self-tightening; the slot opening can be elastically deformed by the respective Clamping element must first be opened until it is

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lets the tensioning element slide over the respective side of the bobbin 1, then pich puts the tensioning element with its inner walls on the respective outer sides of the bobbin
self-tightening. Due to the thickness of these clamping elements 2-5, the respective distance between the
Set opulenwickel 1 and the adjacent inner wall of the injection mold.

Figure 2 shows the finished, injected exciter coil with its surrounding., the clamping elements xintegrating, homogeneous injection molding compound and its smooth outer surface, which means that it has high insulation strength for a long time, even when used in a moist medium is guaranteed.

2 figures

6 claims for protection

Claims (6)

- 5 - VPA 73/3046 fZ Sohutz claims 1. Coil, in particular an excitation coil for lye pumps, the coil winding of which before an overmolding for the production of a The insulating cover is stored in the mold at a distance corresponding to its thickness from the respective wall of the injection mold is, characterized in that the bobbin wiokel (1) produced without a bobbin is made up of ring-like clamping elements (2-5) is encompassed, the arrangement and wall thickness of the respective thickness of the insulating sheath to be overmolded is equivalent to" 2. Coil according to claim 1, characterized in that the ring-like 3 tensioning elements (2-5) are elastic and interrupted by a slot opening (6 or 7) each so that the Tensioning elements (2-5) can be slipped over the respective part of the bobbin winding (1) and are self-tensioning on this issue. 3. Coil according to claim 1 and / or 2, characterized in that a material is provided for the clamping parts (2-5), whose melting temperature is lower than the maximum temperature of the injection molding compound filled into the injection mold in such a way that that the tensioning elements (2 - 5) are loosened in their outer layer by the injection molding compound. 4. Coil according to one of claims 1 to 3, characterized in that that the clamping elements (2-5) are made of plastic. 5. Coil according to claim 5 and 4, characterized in that as The material for the clamping elements (2-5) and the injection molding compound are each a polyamide with correspondingly different temperature values is provided. 6. Coil according to claim 3 and 4, characterized in that the material for the clamping elements (2-5) and the injection molding compound - 6 - VPA 73/3046 J / each a polyacetal with correspondingly different temperature values is provided. 730S528-7.6.73