DE7321781U - Multi-phase relay for controlling contactors - Google Patents

Description

ΓATB HTANWAI-T

DXFL. ING. K. HOLZEH AUGSBURG

KLeEB-STBABBB IA space*. «I» f «

W.

Augsburg, June 7, 1973

Westinghouse Electric Corporation, Westinghouse Building, Gateway Center, Pittsburgh, Allegheny County, Pennsylvania 15222, V.St _e A _e

Multi-phase relays for controlling contactors

The innovation concerns a multi-phase relay for controlling contactors, with the relay in one of its Operating position holding release, also with the release depending on predeterminable overload limit values and phase asymmetry limits in the sense of a

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opening the contactor actuating means »each have bimetals assigned to a phase and bendable in the same direction, and with a sliding piece arrangement for converting the bimetal bends into a release movement of the release

Thermal overload contactors that protect against overload interrupt a multi-phase circuit are already known "

The aim of the innovation is to solve the problem, in the case of a multi-phase relay, of the general type set out at the beginning Kind of providing a release mechanism that is as simple as possible in terms of its structure and which is nevertheless reliable works and responds faster to overload conditions which cause phase asymmetry than to overload conditions which do not affect the phase symmetry

In terms of solving this problem, such a multi-phase relay according to the innovation is characterized by: that the sliding piece arrangement consists of two mutually parallel sliding pieces and one on one of the two Sliding pieces can be swiveled around a fixed pivot point · »

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steered lever exists, which the latter acts directly on the trigger at a point distant from its pivot point, and that one sliding piece has parts resting on the more strongly expanding sides of the bimetals and the other sliding piece has parts resting on the less stretching sides of the bimetals and on a point located between the pivot point of the lever and its point of application on the O trigger in the direction of the trigger on Lever engages in such a way that with simultaneous deflection of all bimetals a straight shift of the entire sliding piece arrangement and with a deflection of less than all bimetals a shift of the said other sliding piece relative to said one sliding piece and consequently a pivoting movement of the lever results.

A preferred spatial form of the innovation is

for example, with reference to the attached drawings.

Pig, Fig. 1 is a side view showing

like a thermally actuated relay according to the innovation alongside a contactor can be arranged,

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Pig «2 a front view of the relay

after the innovation,

Fig »3 is a plan view of the innovation

proper relays,

Fig. 4 is a rear view of the innovation

appropriate relay,

Fig. 5 is also a rear view of the

Relay according to the innovation, but in the tripped state,

6 along a horizontal section

the line VI-VI in Fig. M,

FIG. 7 shows one of FIG. 6 corresponding

Representation, but in a different operating position, and

8 is an exploded view of a

the bimetal elements

Fig «1 shows an electrical control device or a thermally actuated relay 10 in conjunction with a

I contactor 12 for switching a load, for example a three-phase motor 0 The relay and the contactor are electrically connected to one another by an electrical connection 14 running between terminals 16 and 18 The contactor is constructed in the usual way, like it is shown, for example, in U.S. Patent 3,368,171.

Referring to Figure 4, the relay 10 comprises a molded insulating housing 20 having a front wall 22, a upper wall 24, a bottom wall 26 and opposing side walls 28 and 30 on »These Walls form an open cavity 32 for receiving the functional parts of the relay. The cavity 32 is made of three chambers separated by insulating partitions 34, 36 and 38 cast in one piece with the housing are. As FIGS. 2 and 3 show, the partitions 34, 36 and 38 extend over the top wall 24 and over a part of the front wall 22 of the housing 20 and delimit spaces in each of which one, in each case one phase associated line connection is arranged. Each line connection has an approximately L-shaped connection piece which through an opening in the upper wall 24 of the housing 20 protrudes through into the cavity 32, where it is fastened by means of a screw 42. The housing 20 is

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provided with a lid 44 (Fig * 1 and 3), which means Screws 46 are fastened, which are screwed into Q threaded holes 48 (Fig. 4)

The relay mechanism located in cavity 32 includes an operating mechanism 50 and an actuating mechanism 52 which are suitably secured in the housing are «The working mechanism 50 has an electric conductive, L-shaped frame 54, which is through a Opening in the upper wall 24 extends through to the front side (FIG. 2), where it forms a connection piece provided with a connection screw 56. The frame 54 is fastened to the front wall 22 by means of a screw 58 and has two protruding parallel prongs 60 and 62 (Fig. 4) which serve to attach other parts of the working mechanism 50, for example one Adjusting lever 64, a release lever or · compensation bimetal 66, a contact carrier 68, a back part «· Pin 70 and a compression spring 72 ″ The working mechanism is used to press and lift the contact carrier 68 with a movable contact 76 to or from a stationary contact 74 for the purpose of opening and closing of a circuit

Fixed contact 74 is on the top

a U-shaped connector 78 mounted, the The lower end is fastened to a connection tab 80, the latter extending through an opening in the front wall 22 (Pig · 2) where it has a clamping screw 82 · The adjustment lever 64 is pivotally mounted on the prong 60 and has a lower end portion 84 which is bent at substantially a right angle and is provided with a slot is provided, in which the release lever or the! Compensations · » bimetallic 66 is pivotally mounted «The adjusting lever 64 is assigned an adjusting knob 86, which is rotatable in the upper Wall 24 of the housing 20 is mounted and has a cam surface 88 cooperating with the upper end of the adjusting lever 64, so that the position of the lever 64 accordingly different currents can be adjusted, as indicated by the dashed line position 64a in Fig. 4 shows « Adjustment knob 86 is described in more detail in US Pat. No. 3,265,831.

The trip lever 66 has a bent upper part which, in its latched position, rests on the upper end of the contact carrier 68, as shown in FIG Contact carrier 68 under the

Influence of the compression spring 72 can assume its uppermost position. A compression spring 94 arranged between the release lever 66 and the partition wall above the end part 84 of the adjusting lever 64 urges the release lever 66 into its latched position (Fig. 4). The lower end of the release lever 66 acts with it a slide assembly, generally designated 92, as will be described later.

The upper end of the contact carrier 68 is in three parts namely, a central part 96 and side parts 98 located on one side of the prong 62, of which only one is shown and which are located on the other side of the tine 62 · The tine 62 thus leads the Contact carrier 68 when this under the pressure of the spring for the purpose of opening the contacts 74 and 76 upwards moves and when the contact carrier when pressing down the reset pin 70 for the purpose of closing the contacts and 76 is moved downward. Contacts 74 and 76 can be in be connected in the known way in the excitation circuit of the contactor.

At a distance from the fixed contact 74 is another

Fixed contact 100 arranged, with which the movable contact 76 closes when the contact carrier 68 is released by the release lever 66 and contacts 76 and 76 open under the pressure of spring 72. The contact sits on a connection lug 102 which extends through an opening in the front wall 22 of the housing 20 and is provided with a clamping screw 104 for connecting the contact to a circuit, for example to a Alarm circuit for displaying the tripping status of relay 10,

Although the release lever 66 is shown as a simple lever, it can be designed as a bimetal and then serves in a known way to compensate for the ambient temperature,

When the contact carrier 68 is released by the release lever 66 and is therefore in the position shown in FIG Moved position, the end 68a of the contact carrier 68 takes the reset pin 70 at its lower end and moves move it into a position indicating the release state, in which the other end of the reset pin 70 continues from protrudes from the relay housing and thus visibly indicates the triggering status of the relay «To reset the relay and to close contacts 74 and 76, the reset

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pen 70 by hand against the spring pressure of spring 72 depressed until the upper end of the central portion 96 of the contact carrier is below the end portion 90 of the trip lever 66, so that the spring 94 the trip lever returns to its original position, in which it is over the upper end of the central part 96 of the contact carrier engages and thereby locks the contact carrier 68 in its closed position shown in FIG Reset pushes a protruding over the lower end of the reset pin 70 projection 70a the spring-like Connector 78 down on which the fixed contact 74 is mounted, and holds this contact in his Open position. When releasing the reset pin 70 a compression spring 10U lifts the reset pin so far, that the spring-like connection lase 78 with the fixed Contact 74 in the closed position with contact 76 back · * » can spring »

The actuation mechanism of the relay has a bimetal 52 and a sliding piece arrangement 92 for converting the bimetal bends into a triggering movement of the triggering lever 66 for each phase. The bimetals 52 are each provided with an electrical connection device that has a

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Connection piece 112, a clamping screw 114 (Fig. 3 and 4), a flexible conductor piece 116 and a connecting piece 118. The bimetals themselves consist of a heating » element 106, the actual bimetal 108 and one intermediate insulating washer 110, as shown in FIG. 8 · Furthermore, each bimetal 52 has a mounting bracket 120, an insulating washer 122, a O electrically conductive washer 124, an insulating piece 126, an intermediate piece 128, two insulating sleeves 160, another insulating washer 132 and screws 134 and 136 on «The screw 134 is in a hole 138 of the connecting piece 118 and the screw 136 in a hole 140 of the Mounting bracket 120 screwed in · The mounting bracket 120 is fastened to the connecting piece 40 by means of the screw 42 · The The circuit through the actuation mechanism 52 extends from the connector socket 112 through the cable 116, the Connecting piece 118 and through the screw 134 to the intermediate piece 128, then through the straight leg of the bimetal downwards and the liriken side of the bimetal upwards, bright through the electrically conductive washer 124, from since through the left and right legs of the heating element 106, through the mounting bracket 120 and to the

Connector 40 "If an overcurrent flows through the heating element 106, the bimetal 108 bends (in FIG.

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To the right). According to FIG. 8, the bimetals 108 instruct their lower ends each have a projection 142 which cooperates with the sliding piece arrangement 92 "

As can best be seen from FIGS. 6 and 7, the sliding piece arrangement 92 consists of two sliding pieces 144 and 146 and a lever 148. The lever is mounted on the sliding piece 146 so as to be pivotable about a fixed pivot point and engages with a projection 162 directly on it Release lever 66 on. The sliding pieces 144 and 146 shown as flat parts, which are displaceable in the same plane, have parts 150, 152 and 156, 158 and 160, which each interact with the approaches of the bimetals 108. The lugs 150, 152 and 154 of the sliding piece 144 lie directly on the less stretching sides of the bimetal and the lugs 156, 158 and 160 of the sliding piece 146 lie directly on the more stretching sides of the bimetal between pivot point 168 and protrusion 162 of the lift. ¹ 3 148 located shoulder 164 of the lever on «On its side facing the sliding piece 144, the lever 148 has a recess 166 (FIG. 4) which receives the transverse part 154 of the sliding piece 144.

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The actuation mechanism just described works as follows: If a symmetrical overload occurs in all phases of the circuit, all bimetals (of which it is assumed that their more stretching sides are on the right in FIGS. 4 to 7) bend to the right and the applied to the parts 150, 152 and 154 of the sliding piece 142 approaches the bimetals also push the sliding piece 144 to the right. This displacement of the sliding piece 144 is transmitted via the lever 148 to the other sliding piece 146, which, if it is not held back, moves together with the sliding piece 144 Sliding pieces 144 and 146 in the sense of releasing the release lever 66 into its notched position shown in FIG. 6 with dot-dash lines 66a, so that the relay opens.

If the bimetals 108 cool after the relay has been triggered, they slide on the parts 156 to 160 of the sliding piece 146 abutting lugs 142 of the bimetals restores the entire sliding piece assembly to its original, in Fig. 6 position shown back, so that the relay can be reset in the manner described above «

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When an asymmetrical overload condition occurs, only the bimetals assigned to the overloaded phases bend, while the bimetals assigned to the other phases remain in their normal position Sliding piece 144 cooperate, the latter also to the right in the manner described above, however, since the extension 142a of the bimetal which is assigned to the non-overloaded phase and therefore does not bend bears against part 156 of the sliding piece 146 and prevents it from being displaced together with the sliding piece 144, The sliding piece 144 moves relative to the sliding piece 146 and presses against the lever 148 at 164 so that it pivots it to the right about its pivot point 168. This causes the release lever 66 to operate in the manner described above with regard to the symmetrical overload condition, but much faster in its not pivoted to the left position, since the point 162 acting on the release lever 66 now executes a rotary movement instead of a straight-line movement, because the speed of the release movement is the ratio of the distance a (Fig. 7) between points 168 and 162 to distance b between points and 164 directly proportional to «As asymmetrical overload ·»

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conditions very destructive to consumers «for example Electric motors, which can work, the accelerated response of the relay to asymmetrical overloads is extremely advantageous"

Thus a manual triggering of the relay is possible, the sliding piece 144 of the space \ J shown form a manually operable, from the relay case protruding part, as shown in FIGS. 4 to 7 is.

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Claims (4)

Protection claims 1 · Multi-phase relay for controlling contactors, with a release that holds the relay in one of its operating positions, and also with the release as a function of predeterminable overload limit values and phase asymmetry limit values in the sense of opening the contactor actuating means that are each assigned to a phase and bimetals that can be bent in the same direction, and with a sliding piece arrangement for converting the bimetal bends into a triggering movement of the trigger, characterized in that the sliding piece arrangement (92) consists of two sliding pieces (144 ₉ 146) which can be moved parallel to one another and one on one of the two sliding pieces (146) about a fixed pivot point (168) pivotably articulated _ lever (148) consists, the latter on one of his The fulcrum remote point (162) engages directly on the trigger (66), and that the one sliding piece to the itself more stretching sides of the bimetals (108) parts (156, 158, 160) and the other sliding piece (144) has on the less stretching sides of the bimetallic parts (150, 152, 154) and on one between the pivot point of the lever and its point of application on the trigger point (164) in the direction of the trigger - 16 - attacks towards the lever in such a way that with simultaneous deflection of all bimetals there is a straight shift the entire sliding piece arrangement and with a deflection of less than all bimetals a shift of said other sliding piece relative to said one sliding piece and consequently a pivoting movement of the Lever results. / 2. Multi-phase relay according to claim 1, characterized in that the two sliding pieces (144, 146) as flat parts are formed and can be moved in a common plane «/ 3 · Multi-phase relay according to claim 1 or 2, characterized in that said other sliding piece (144) has a manually operable projection which enables the trigger (66) to be triggered by hand. / 4. Multi-phase relay according to claim 3, characterized in that the manually operable projection of the the other sliding piece (144) protrudes through a housing opening from the housing (20) accommodating the contactor /