Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets

Definitions

• the invention relates to a valve magnet, comprising a coil and an iron circuit, which are arranged in a housing that can be used in potentially explosive areas.
• Valve magnets of this type have been known for some time and can be seen, for example, from German utility model 90 03 343 or from US Pat. No. 5,138,292.
• Types of protection according to IEC or EN are: “Flameproof encapsulation (EExd)”, “Increased safety (EExe)”, “Overpressure encapsulation (EExp)”, “Intrinsically safety (EExi) “,” oil encapsulation (EExo) “,” sand encapsulation (EExq) “and” encapsulation (EExm) ".
• Construction methods for explosion-proof magnets are also known, in which not only the “pure” types of protection mentioned above are used, but also combinations of these types of protection, such as, for example, the types of protection “potting encapsulation” combined with “increased safety” or “pressure-resistant encapsulation” with “increased security”.
• the object of the invention is to develop an explosion-proof valve magnet of the generic type in such a way that it can be produced easily and inexpensively in the connection area of external lines if the type of protection "flameproof encapsulation" is fulfilled.
• valve magnet of the type described at the outset in that the coil and the iron circuit are embedded in a casting compound which is introduced into a housing part and which prevents the access of an explosive atmosphere to live parts and at the same time serves for fixing and electrical insulation (encapsulation encapsulation ) and that connection elements of the coil are arranged in a housing part which withstands an internal pressure in the event of an explosion and prevents transmission of the explosion to the environment (pressure-resistant encapsulation).
• the great advantage of dividing the housing into two housing parts, one of which fulfills the type of protection "encapsulation” derenid the other of the type of protection "flameproof encapsulation” has the great advantage that the coil and the iron circuit, especially the magnetic sleeve is not part of the pressure-resistant space .
• This part of the housing can thus do without the complex fits that are required for flameproof enclosures because of the flame-proof gap. By avoiding such gaps, which must have a prescribed minimum length, the size of the magnet can also be reduced.
• valve magnet In addition to its simple manufacture, it is also advantageous with such a valve magnet that encapsulated coils and iron circles or magnetic connection sleeves are available as standard parts, which results in a smaller inventory. Nevertheless, the external lines can be connected in a pressure-tightly encapsulated space arranged in the second housing part.
• Fig. 1 shows a valve magnet according to the invention in an exploded view
• Fig. 2 a sectional view of the valve magnet according to the invention shown in Fig. 1.
• a valve magnet shown in FIGS. 1 and 2, comprises a housing 10 which is divided into two housing parts 11, 12.
• a coil 30 and an iron circuit 31 are embedded in a casting compound 20 in the housing part 12 which fulfills the type of protection “encapsulation, EExm”.
• the coil has a through opening 32 for receiving an armature, through which, in a manner known per se, a valve in a Electrical connection elements 41 are also embedded in the potting compound 20, which protrude beyond the potting compound 20 that closes the end of the housing part 12.
• the potting compound 20 serves to keep an explosive atmosphere away as well as for fixing and electrical insulation.
• connection elements 41 for connecting electrical lines for actuating the coil 30 are arranged in the other housing part 11, which fulfills the “flameproof enclosure” type of protection. External lines are introduced into the interior of the flameproof housing part 11 via an opening 14.
• the housing part 11 is closed at the end by a cover 17 which engages with a projection 17a formed on it in an end opening 18 of the housing such that the projection 17a over a predetermined length with the opening 18 complementary to the projection 17a to form a ignition-proof gap overlaps between the projection 17a and the opening 18.
• a seal 60 can be provided, which is arranged between the cover 17 and the housing 10 in the assembled state.
• the housing part 11 is designed in such a way that, in the event of an explosion of an explosive mixture, it can withstand a pressure prescribed by standard regulations and a transmission of the explosion to the surroundings of the housing 10 is prevented.
• valve magnet described above is that the encapsulation encapsulation of the housing part 12 and thus an explosion-proof valve magnet, which fulfills the combined type of protection EExmd (encapsulation encapsulation and flameproof encapsulation), is simple and therefore inexpensive to produce.

Landscapes

• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Magnetically Actuated Valves (AREA)
• Electromagnets (AREA)
• Valve Housings (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7881894

Family Applications (1)

Country Status (5)

Families Citing this family (26)

Citations (3)

Family Cites Families (8)

• 1998
  • 1998-09-23 DE DE19843519A patent/DE19843519A1/de not_active Withdrawn
• 1999
  • 1999-08-19 US US09/806,005 patent/US6752372B1/en not_active Expired - Lifetime
  • 1999-08-19 JP JP2000571469A patent/JP2002525862A/ja active Pending
  • 1999-08-19 DE DE59910076T patent/DE59910076D1/de not_active Expired - Lifetime
  • 1999-08-19 EP EP99953536A patent/EP1116247B1/de not_active Expired - Lifetime
  • 1999-08-19 WO PCT/DE1999/002602 patent/WO2000017895A1/de not_active Ceased
• 2010
  • 2010-03-01 JP JP2010044297A patent/JP4838366B2/ja not_active Expired - Lifetime

Patent Citations (3)

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