DE102008021768B4 - Electromagnetic release, method for producing an electromagnetic release and circuit breaker with an electromagnetic release - Google Patents

Abstract

Electromagnetic release (23), with a magnetic core (101) and a movable magnet armature (102), with a coil arrangement comprising a coil tube (115), with a magnetic circuit, which has a core yoke plate (103) to which the magnetic core (101) is attached , and a yoke anchor plate (113), through which the armature (102) passes, as well as yoke side parts (112) connecting the core yoke plate (103) and the yoke anchor plate (113), characterized in that the magnetic circuit in its interior comprises an insulating material housing (124) with insulating material plates (127, 128, 129, 130), the coil tube (115) being connected in one piece to the insulating material housing (124), and that the armature (102) in the coil tube (115 ) is guided.

Description

The invention relates to an electromagnetic trigger with a magnetic core and a movable magnetic armature, with a coil arrangement comprising a coil tube, with a magnetic circuit, which has a core yoke plate to which the magnetic core is attached, and a yoke armature plate through which the armature passes, as well the core yoke plate and the yoke-anchor plate connecting yoke side parts comprises, according to the preamble of claim 1. The invention further relates to a method for producing an electromagnetic release according to the invention, as well as an installation switching device with an electromagnetic release according to the invention.

From the DE 1 222 574 A It is known to wrap a thin-walled carrier body to produce a switching coil and then encapsulate, press or cast it with a plastic. From the US 6,377,146 B1 an actuator is known which has a housing relative to which a rod can be moved, an electromagnetic relay being provided for driving the rod, which is arranged in a recess in the housing and has a magnetic coil.

A generic electromagnetic trigger is, for example, from DE 10 2006 024 249 known. It comprises a magnetic core and a magnetic circuit with a movable magnetic armature, with a coil arrangement comprising a coil tube, with a core yoke plate to which the magnetic core is attached, and with a yoke armature plate through which the armature passes, as well as with the core yoke plate and the Yoke side parts connecting yoke anchor plate.

In known magnetic releases, the core is surrounded by a coil tube, which is a cylindrical tube made of an insulating material, for example ceramic, and runs with a uniform diameter between the core yoke plate and the yoke anchor plate. Its inner diameter is matched to the largest outer diameter of the magnetic core. Therefore, there is no fixed guidance between the armature and the interior of the coil tube; rather, the armature protrudes into the coil tube, but can also move transversely to its longitudinal direction. This can lead to contact between the anchor and the yoke, which can result in an undesirable “humming” of the anchor.

In known magnetic triggers, the core is attached to the core yoke plate by riveting in the area of the firing pin guide. The disadvantage of this is that when riveting, the nickel layer of the rivet, which is nickel-plated at this point for corrosion protection reasons, can chip off. This can cause rust to form, which will hinder firing pin travel if it occurs.

In known magnetic triggers, the core yoke plate is attached to the yoke side parts by laser welding. The disadvantage of this is that a weld seam is created, which is complex to produce and can disrupt the magnetic flux.

It is therefore the object of the present invention to further develop a generic electromagnetic trigger in such a way that humming is avoided and it has improved mechanical and magnetic properties.

The task is solved by a generic electromagnetic trigger with the characterizing features of claim 1.

The magnetic circuit includes in its interior an insulating material housing with insulating material plates, the coil tube being connected in one piece to the insulating material housing, and the armature being guided in the coil tube

According to a particularly advantageous embodiment of the invention, the insulating material housing is formed from two housing halves pushed one above the other in a box shape.

According to an advantageous development of the invention, the insulating material housing comprises a support wall for holding the access conductor to the coil arrangement located inside the insulating material housing.

With regard to the coil tube, an advantageous embodiment provides that the coil tube comprises two telescopically nested partial tubes, and that a first partial tube is connected to a first housing half and a second partial tube is connected to the second housing half, so that when the housing halves are pushed one over the other, the partial tubes are also one above the other push.

With regard to the connection of the magnetic core to the core yoke plate, a very advantageous embodiment of the invention provides that the magnetic core is positively and non-positively connected to the core yoke plate by at least two caulkings in its outer peripheral region.

With regard to the connection of the yoke side parts to the core yoke plate, an advantageous embodiment of the invention provides that the yoke side parts are held on the core yoke plate by means of bent retaining tabs.

A method according to the invention for producing an electromagnetic trigger is characterized in that, in order to attach the yoke side parts to the core yoke plate, the core yoke plate is first held in place on the yoke side parts by caulking and then rectangular holding tabs protruding from the yoke side parts are attached to the core -yoke plate must be bent over.

With regard to the method of attaching the magnetic core to the core yoke plate, an advantageous development of the method provides that, in order to attach the magnetic core to the core yoke plate, the end face of the magnetic core is radially riveted to the core yoke plate by caulking at at least two points located on the outer peripheral edge of the magnetic core .

Further advantageous refinements and improvements of the invention and further advantages can be found in the subclaims.

The invention and further advantageous refinements and improvements of the invention will be explained and described in more detail using the drawings, in which an exemplary embodiment of the invention is shown.

• 1 einen Teilschnitt in Richtung einer Längsseite eines erfindungsgemäßen elektromagnetischen Auslösers,
• 2 einen Teilschnitt in Richtung der gegenüberliegenden Längsseite des elektromagnetischen Auslösers gemäß 1,
• 3 schematisch die Innenansicht eines Installationsschaltgerätes mit einem erfindungsgemäßen elektromagnetischen Auslöser, sowie
• 4 und 5 einen Längsschnitt und eine Aufsicht auf die Befestigung des Magnetkerns an der Kern-Jochplatte.

Show it:

• 1 a partial section in the direction of a long side of an electromagnetic trigger according to the invention,
• 2 a partial section in the direction of the opposite long side of the electromagnetic trigger 1 ,
• 3 schematically the interior view of an installation switching device with an electromagnetic release according to the invention, and
• 4 and 5 a longitudinal section and a top view of the attachment of the magnetic core to the core yoke plate.

In the figures, identical or identical components and components are designated with the same reference numerals.

Let it be first of all 3 considered. This schematically shows a top view of an open installation switchgear, a main circuit breaker, as shown in the DE 10 2008 017 472 is described. The DE 10 2008 017 472 should be expressly included here with regard to its disclosure content regarding the structure and function of the installation switching device.

In the view of 4 an intermediate part 500 can be seen in the left half of the device. In the right half of the intermediate part 500, a pocket-like recess is formed, also referred to as a housing section 504, in which an arc extinguishing device 200 is accommodated. The arc extinguishing device 200 is assigned to a main contact point 22. It essentially comprises an arc quenching plate package, which is further described below.

The arc created when the main contact point 22 opens is fed from the main contact point 22 to the arc extinguishing device 200 via a fixed contact guide rail 421, which carries the fixed contact piece 46 at its free end, and an arc guide rail 42 referred to as a counter guide rail.

The right part 502 of the top 501 of the intermediate part 500, on which the arc extinguishing device 200 rests, forms the upper end of a further subspace of the device underneath, into which the arc gases from an isolating contact are introduced.

The arc quenching plate package 200 is open to the left towards the left part 503 of the top 501 of the intermediate part 500, so that the arc gases are directed out of the arc quenching plate package 200 into this partial area. The left part 503 of the top 501 carries webs 401 arranged perpendicular to the rear narrow side 17 of the device and parallel to one another. These form exhaust air channels between them, which lead to exhaust air openings 400 in the rear narrow side 17 of the housing. These exhaust air ducts reduce the pressure created by the arc and the switching gases can escape to the outside through these exhaust air ducts.

The main current path runs, starting from an access terminal, which is arranged under the intermediate part 500 and is therefore shown in the illustration 3 is not visible, via a main thermal bimetal 7 attached to the free end of a busbar 6, further from the free end of the main thermal bimetal 7 via a strand 40 to the counter guide rail 42, from there via a strand 43 to the movable contact piece 44 of the main contact point 22, from the fixed contact piece 46 of the main contact point 22 via a busbar 47 to an impact anchor system 23 and further to a connection terminal 21.

The movable contact piece 44 is located at the free end of a switching lever 221 which is pivotably mounted on a stationary axis 222. This can be pivoted about the axis 222 by means of a control part 223. If the impact anchor system 23 is triggered in the event of a short circuit, then a firing pin 105 shoots out from its upper narrow side and hits the control part 223, whereby it is pivoted counterclockwise and also takes the switching lever 221 counterclockwise, so that the movable contact piece 44 is knocked away from the fixed contact piece 46. During this switching operation, the above-mentioned switching arc occurs at the contact point 22. The main current path is now interrupted.

They will now be 1 and 2 considered, which show the impact anchor system 23, also referred to here as an electromagnetic trigger.

A fixed magnetic core 101 and a movable magnetic armature 102 are assigned to the electromagnetic trigger 23.

The magnetic core 101 is attached to a core yoke plate 103 of an iron circle and has an axial passage 104 through which a striker pin 105 extends, which, driven by the movable armature 102, via the control part 223 onto the contact piece 44 of the contact point 22 (not shown here) affects. There is a hole 107 in the core yoke plate 103 in which the magnetic core 101 is held.

The magnetic core 101 is fastened in the core yoke plate 103 by embossing or by radial riveting in the outer peripheral area, also called the riveting area, of the magnetic core, see also 5 . For this purpose, the magnetic core 101 has on its upper end face 109 a circumferential step 110 with which it rests against the core yoke plate 103 from below. At four rivet points 111 arranged crosswise on the circumference of the magnetic core 101, a positive and non-positive connection between the magnetic core 101 and the core yoke plate 103 is achieved by caulking, also called stamping, see 4 . It has been shown that riveting via 4 stamp points 111 arranged crosswise ensures sufficient mechanical strength with optimal magnetic coupling at the same time.

The advantage of this type of fastening lies in the optimized magnetic transition and the optimized magnetic flux between the core 101 and the core yoke plate 103. Because the riveting is designed as a radial rivet in the outer area of the magnetic core, it has no influence on the running of the firing pin 105 .

The iron circle has yoke side parts 112 which run parallel to the direction of movement of the anchor 102 and which are connected to the core yoke plate 103 and a yoke anchor plate 113 opposite it, the yoke anchor plate 113 having a through opening through which the anchor 102 can reach. In the representation of the 4 For the sake of clarity, only one of the yoke side parts 112 is shown. In the representation of the 1 and 2 The yoke side parts are in front of or behind the drawing plane and therefore cannot be seen. In principle, however, the structure of a magnetic circuit consisting of a core yoke plate, yoke anchor plate and two side parts is known, and in a modified form, for example in DE 10 2006 024 249 A1 shown.

The connection between the core yoke plate 103 and the yoke side parts 112 is produced by laterally caulking the core yoke plate 103 and then bending retaining tabs 114, also called yoke tabs, formed on the yoke side parts 112. Corresponding recesses are provided at the edges in the core yoke plate 103, which correspond in position and shape to the retaining tabs 114 on the yoke side parts. In the example of 1 There are two such retaining tabs 114 attached to each yoke side part. They are rectangular extensions that rise vertically above the core yoke plate 103 when assembled but not yet attached. In a first step, the material of the core yoke plate 103 is now pressed in or caulked a little on both sides of each retaining tab 114. The retaining tabs 114 are clamped in place due to the minimal flow of the material that occurs. This prevents the retaining tabs 114 from slipping when the retaining tabs 114 are subsequently bent over. After bending the retaining tabs 114 onto the core yoke plate 103, a mechanically very strong coupling of the core yoke plate 103 to the yoke side parts 112 is achieved. Because of the upstream clamping during caulking, the mechanical tolerances are very small; a very precise alignment of the core yoke plate 103 on the yoke side parts 112 is achieved.

The advantage of this type of fastening compared to the laser welding known from the prior art is that no welded connection occurs, which brings a significant manufacturing advantage, since a laser weld seam represents a costly manufacturing step, and at the same time achieves high mechanical strength and low magnetic resistance is achieved.

The magnetic core 101 is surrounded by a coil tube 115, and the coil tube 115 is surrounded by a coil winding 116, which has a supply line 117 and a discharge line 118, so that the coil with the coil winding 116 via the supply and the derivative 117, 118 can be switched into the main current path.

The armature 102 engages at least partially in the coil tube 115 and is held in the rest position at a distance from the magnetic core 101 by a spring (not shown here), this distance being between the end faces of the armature 102 and the core 101. In the event of a trip, when a short-circuit current flows through the coil winding 116, the magnetic force of the short-circuit current overcomes the force of the spring and the armature 102 is suddenly moved in the direction of the magnetic core 101, whereby it suddenly acts on the striker pin 105.

The coil tube 115 comprises two telescopically telescoped partial tubes 119, 120. A first partial tube 119 surrounds the magnetic core 101 and also the armature 102 and its inner diameter in its area surrounding the core 101 is adapted to the outer diameter of the magnetic core 101 so that in the partial area of the magnetic core 101, which is adjacent to the core yoke plate 103, there is a press fit between the magnetic core 101 and the inner surface of the first partial tube 119 and the first partial tube 119 is thereby fixed in position by the magnetic core 101.

In the range of movement of the anchor 102, the first partial tube 119 is matched with its inner diameter to the outer diameter of the anchor 102 in such a way that the anchor 102 is slidably guided by the first partial tube 119 in its movement towards the core 101, i.e. there is a very little play between the anchor 102 and the first partial tube 119. The first partial tube 119 therefore guides the anchor 102 towards the core 101. The advantage of this embodiment is that there is almost no offset between the core 101 and the armature 102, thereby enabling a large holding force between the core 101 and the armature 102 in the event of a short circuit.

The first partial tube 119 ends just before the yoke anchor plate 113 and does not penetrate it. As a result, the diameter for the through opening 121 in the yoke anchor plate 113, through which the anchor 102 extends, can be kept very small. This creates only a very small air gap between the yoke anchor plate 113 and the armature 102. This has the advantage that a good magnetic flux is ensured across the very small gap. Due to the above-mentioned close guidance of the anchor 102 in the first partial tube 119, a lateral displacement of the anchor 102 and thereby contact of the anchor 102 with the yoke anchor plate 113 in the through opening 121 is prevented. This means that no “humming” of the armature 102 can occur, since the cause of such armature humming is contact between the armature 102 and the yoke at the through opening 121 in the yoke-anchor plate 113.

The outside diameter of the first partial tube 119 is reduced in the tube half facing the yoke anchor plate 113 compared to the outside diameter in the half facing the core yoke plate 103, so that a step 122 is created at the transition between the two areas on the outer circumference of the first partial tube 119, while the inside diameter is unaffected by it.

In the tube half facing the yoke anchor plate 113, the first partial tube 119 is closely surrounded by a second partial tube 120, so that the first partial tube 119 is closely guided in the second partial tube 120. The outer diameter of the second sub-tube 120 corresponds approximately to the outer diameter of the first sub-tube 119. The first and second sub-tubes 119, 120 are thus telescopically pushed into one another; you can also say that they are nested with one another.

The small gap 123 between the first and second partial tubes 119, 120 advantageously creates an additional air and creepage distance, which further increases the insulation strength of the magnetic release 23.

The interior of the iron circle is lined by an insulating material housing 124, which comprises box-shaped interconnected insulating material plates 127, 128, 129, 130, which are spanned inside by the core yoke plate 103, the yoke side parts 112 and the yoke anchor plate 113 Line the room to the outside. In the in the 1 and 2 In the exemplary embodiment shown, the insulating material housing 124 forms an approximately rectangular box. The magnetic circuit includes two parallel yoke side parts. The broad sides 133 of the insulating material housing 124 rest on the core yoke plate 103 or the yoke anchor plate 113. The long sides of the insulating material housing each rest on a yoke side part; Since these run in front of or behind the drawing plane, they are included in the representation 1 and 2 not visible. The end faces 131, 132 of the insulating material housing are not covered by magnetic circuit parts.

On the end faces 131, 132 of the insulating material housing 124 there are recesses 134 for the passage of the supply and output conductors 117, 118 to the coil winding 116 located inside the insulating material housing 124.

The insulating material housing 124 consists of an upper housing assigned to the core yoke plate and a lower housing assigned to the yoke anchor plate half 125, 126 assembled. The upper housing half comprises a core yoke housing plate 127 and first partial side plates 128, 129 formed approximately vertically thereon. In the exemplary embodiment as in the 1 and 2 shown, the upper housing half 125 forms an approximately rectangular box that is open towards the bottom.

The lower housing half 126 includes a yoke-anchor housing plate 130 and second partial side plates formed approximately vertically thereon. In the in the 1 and 2 In the exemplary embodiment shown, the second partial side plates are located in front of or behind the drawing plane and are therefore not visible in the figure. The lower housing half is essentially open on the end faces 131, 132.

The insulating material housing 124 is assembled by putting the upper housing half 125 over the lower housing half 126. In the area of the long sides, the thickness of the insulating material housing 124 is determined by the total thickness of the upper and lower housing halves 125, 126. The end faces 131, 132 of the insulating material housing 124 are only formed by the end faces of the upper housing half 125. In this way, the upper and lower housing halves 125, 126 are, so to speak, nested together.

The first partial tube 119 of the coil tube 115 is connected to the core yoke housing plate 127 of the upper insulating material housing half 125, and the second partial tube 120 of the coil tube 115 is connected to the yoke-anchor housing plate 130 of the lower insulating material housing half 126.

In this way, the entire interior area of the iron circuit is lined by the insulating material housing 124, in particular also the coil winding 116. The advantage of this embodiment lies in optimal utilization of the coil space and an increased air and creepage distance due to the lining.

The insulating material housing 124 further comprises a support wall 135, which is oriented with its broad side 136 approximately at right angles to the end faces 131, 132, and which is fastened to the yoke-anchor housing plate 130 of the insulating material housing 124 via a web 137. The support wall 135 has corresponding contours in which the discharge busbar 118 to the coil winding 116 is held inside the insulating material housing 124. In this way, the discharge busbar 118 is also at least partially electrically insulated from the outside and is held in a manner that prevents it from rotating or shifting relative to the coil winding 118 and the insulating material housing 124 via the common holder on the insulating material housing 124.

Outwardly projecting cams 138 are formed on the yoke-anchor housing plate 130 and can engage, for example, snap into corresponding recesses in the yoke-anchor plate 113 of the magnetic circuit. These cams 138 act as an integrated assembly aid by allowing the insulating material housing 124 to be placed in the magnetic circuit without any offset. This further increases the mechanical accuracy in the production of the electromagnetic trigger 23 according to the invention. Twisting or displacement of the insulating material housing 124 relative to the magnetic circuit is thus reliably prevented.

Such an electromagnetic trigger 23 can advantageously be produced by first inserting the coil winding 116 into the lower insulating housing half 126, then plugging the upper insulating housing half 125 onto the lower insulating housing half 126 and nesting it along a circumferential housing connecting line and along one the coil tube 115 is connected to the coil tube seam line surrounding the coil tube. The insulating material housing 124 is then inserted into the magnetic circuit, whereby the core 101 is then also connected to the core yoke plate 103 and the armature 102 is passed through the feed-through opening 121 in the yoke anchor plate 113.

Reference symbol list

6

busbar

7

Main thermobimetal

17

rear narrow side

21

Access terminal

22

Main point of contact

23

Impact anchor system, electromagnetic trigger

40

strand

42

Counter guide rail

43

strand

44

movable contact piece

46

fixed contact piece

47

busbar

101

Magnetic core

102

Magnetic anchor

103

core yoke plate

104

axial passage

105

firing pin

107

Hole in the core yoke plate

108

Rivet area

109

upper front side

110

Level

111

Rivet point, stamp point

112

Yoke side panel

113

Yoke anchor plate

114

Retaining tab, yoke tab

115

coil tube

116

Coil winding

117

supply line

118

Derivation

119

first partial pipe

120

second partial pipe

121

Through opening in the yoke anchor plate

122

Level

123

gap

124

Insulated housing

125

upper half of the housing

126

lower half of the housing

127

Core yoke housing plate

128

first part side plate

129

first part side plate

130

Yoke anchor housing plate

131

front side

132

front side

133

Broadside

134

recess

135

support wall

136

Broad side of the supporting wall

137

web

138

cam

200

Arc extinguishing device

221

Shift lever

222

stationary axis

223

Control part

400

Exhaust opening

401

web

421

Fixed contact guide rail

500

Intermediate part of the device half

501

Top of the intermediate part

502

right part of the top

503

left part of the top

504

Housing section area

Claims (9)

Electromagnetic release (23), with a magnetic core (101) and a movable magnet armature (102), with a coil arrangement comprising a coil tube (115), with a magnetic circuit, which has a core yoke plate (103) to which the magnetic core (101) is attached , and a yoke anchor plate (113), through which the armature (102) passes, as well as yoke side parts (112) connecting the core yoke plate (103) and the yoke anchor plate (113), characterized in that the magnetic circuit in its interior comprises an insulating material housing (124) with insulating material plates (127, 128, 129, 130), the coil tube (115) being connected in one piece to the insulating material housing (124), and that the armature (102) in the coil tube (115 ) is guided. Electromagnetic trigger after Claim 1 , wherein the insulating material housing (124) is formed from two housing halves (125, 126) pushed one above the other in a box shape. Electromagnetic trigger after Claim 2 , wherein the insulating material housing (124) comprises a support wall (135) for holding the access conductor to the coil arrangement located inside the insulating material housing (124). Electromagnetic trigger after one of the Claims 2 or 3 , wherein the coil tube (115) comprises two telescopically nested partial tubes (119, 120), and wherein a first partial tube (119) is connected to a first housing half (125) and a second partial tube (120) is connected to the second housing half (126), so that when the housing halves (125, 126) are pushed over one another, the partial tubes (119, 120) also push over one another. Electromagnetic trigger according to one of the preceding claims, wherein the magnetic core (101) is positively and non-positively connected to the core yoke plate (103) by at least two caulkings in its outer peripheral region. Electromagnetic trigger according to one of the preceding claims, wherein the yoke side parts (112) are held on the core yoke plate (103) by means of bent retaining tabs (114). Method for producing an electromagnetic trigger (23) according to any one of the preceding claims, wherein for attaching the yoke sides parts (112) on the core yoke plate (103), the core yoke plate (103) is first held on the yoke side parts (112) by caulking and then rectangular holding tabs (114) protruding from the yoke side parts (112) are attached to the core -Yoke plate (103) must be bent over. Method for producing an electromagnetic trigger (23) according to one of Claims 1 until 6 , in order to fasten the magnetic core (101) to the core yoke plate (103) at at least two points located on the outer peripheral edge of the magnetic core (101), the end face of the magnetic core (101) is radially riveted to the core yoke plate (103) by caulking. Circuit breaker, in particular selective main circuit breaker, with at least one contact point and with an electromagnetic trigger (23) according to one of Claims 1 until 6 .

Images