KR950013424B1 - A protecting circuit brealeer having a thermo-magnetic sub-assembly - Google Patents

Abstract

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Description

Protection switch incorporating magnetic thermal tripping subsystem

1 and 2 show a partial front view of a closed and open form in response to a short circuit, respectively, in a dipole contact circuit breaker having a magnetic thermal tripping subsystem according to the present invention at each pole.

3 is an enlarged exploded perspective view of a magnetic thermal tripping subsystem related to the electrical connection terminal according to FIG.

4 is a perspective view showing the assembly of the electrical connection terminal and the components of the electromagnetic tripping device after the thermal tripping device is mounted on a substrate in the magnetic thermal tripping sub-system of FIG.

5 is a plan view of a striker lever of the electromagnetic tripping device.

6 is a perspective view of a striker lever coupled to a movable core of an electromagnetic tripping device.

7 is a perspective view of an electromagnetic tripping device / electric connection terminal assembly mounted on a substrate in the magnetic thermal tripping sub-system of FIG.

FIG. 8 is a view similar to FIG. 7 showing a combination of a conductive portion carrying a fixed contact and a magnetic thermal tripping subsystem. FIG.

9 is a perspective view of the contact holder portion in FIG.

10 is a partial perspective view showing the fixed contact point when the contact holder part is turned upside down.

FIG. 11 is a partial view of the circuit breaker of FIG. 1 showing a cross section of a plane through which the movable core of the electromagnetic tripping device slides in a casing which guides the corresponding subsystem when the magnetic thermal tripping subsystem is mounted to the casing. FIG. Figure showing a groove.

* Explanation of symbols for main parts of the drawings

10: protective switch electrical device 11: insulated casing

18,19: Movable contact 20,21: Fixed contact

22,23: conductive part (fixed contact holder part) 26,27: electrical connection terminal

28 bimetal strip thermal tripping device 29 electromagnetic tripping device

30: magnetic heat tripping sub system 41: pivot lever

55: bimetal strip 59: bimetal strip support plate

72: rectangular insulated substrate 73: front end

83: insulating fixing pegs 84: hole

86: winding frame 87,88: flange

90: common pipe 91: control coil

93: movable core (plunger core) 98: coupling fork

103,104 hole 109,110 flange

128: lower surface of the substrate 129: black insulating member

134: coupling means 140: guide rib

142: home

The present invention provides a casing comprising: a) at least one pole current path formed between two electrical connection terminals and provided with at least one movable contact cooperating with a fixed contact; and b) for each pole current path. A self-heating tripping subsystem of; The magnetic thermal tripping sub system includes: 1) a thermal tripping device having one end electrically connected to the fixed contact and a bimetal strip vertically mounted on the plate-shaped conductive support to indicate the opening of the fixed contact in response to an overload current; Wow ; 2) a winding frame of an insulating material in which a control coil is wound around a tube and the movable magnetic core is slidable in response to a short circuit current; and (ii) the movable magnetic core is opened to open the fixed contact in response to a short circuit current. A protective switch electrical device comprising an electromagnetic tripping device with a lever receiving instructions.

Conventionally, in this type of circuit breaker, the magnetic thermal tripping sub-system is relatively large, and since these magnetic thermal tripping sub-systems have difficulty in assembling the thermal tripping device and the striker type electromagnetic tripping device together, There was a problem that the manufacturing process is relatively complicated.

It is an object of the present invention to solve these problems and to provide a magnetically compact tripping subsystem having a common structure for each pole of a switch device of the above-mentioned type in a very compact structure.

It is a further object of the present invention to provide a suitable magnetic thermal tripping subsystem of this type which is easy to assemble and mount in the switch device.

According to the present invention, in the above-described protective switch electric device, the magnetic thermal tripping sub-system has a front end near the fixed contact point, and at the same time, secures and supports the bimetal strip-mounted support part flatly. A board of thin and long insulating material; The lever of the electromagnetic tripping device is pivotably mounted extending axially relative to the bimetal strip over the front end of the substrate.

In a preferred embodiment, the conductive support and the winding frame of the bimetal strip overlap each other and are fixed to the substrate by coupling means, respectively. The two larger surfaces of the bimetallic strip also lie in a plane parallel to the longitudinal direction of the support. The lever is a striker lever for a movable contact supporting portion, and has a coaxial pivot of approximately the same height as the foot of the bimetal strip.

The substrate of the magnetic thermal tripping subsystem and / or the flange of the winding frame have guide ribs slidably formed in the grooves formed in the casing when the magnetic thermal tripping subsystem is mounted in the casing.

Other features, advantages and the like of the present invention will become more apparent from the following detailed description through embodiments related to the accompanying drawings.

In FIGS. 1 and 2, only one pole is shown in these figures, but the protective switch electrical device 10 is a dipole contact low voltage multipole circuit breaker.

The protective switch electrical device 10 is composed of an insulating casing 11 composed of a base 12 and a cover 13, the casing 11 having a protrusion 14 at its front side and a corresponding side at its rear side. A member 15 is provided to snap the device into a standard section.

Each pole of the protective switch electrical device 10 is equipped with two movable contacts 18, 19 arranged on each side of the center plane P, in which the contact bridge 17 is common to all poles. These movable contacts are operated as a result of automatic tripping or manual control in the event of a closed position or overcurrent failure in contact with the respective fixed contacts 20, 21 formed in the respective conductive portions 22, 23, respectively. The contact is configured to occupy one of the open positions away from the fixed contacts 20, 21.

1 and 2, the conductive portion 22 is directly connected to the first electrical connection terminal 26, and the conductive portion 23 is bimetallic strip thermal tripping to provide protection against overcurrent. It is connected to a second electrical connection terminal 27 via a series electrical circuit consisting of a device 28 and a striker type electromagnetic tripping device 29 which provides protection against short circuit current.

According to the present invention, the thermal tripping device 28 and the striker-type electromagnetic tripping device 29 and the electrical connection terminal 27 associated therewith are integrated with the common magnetic tripping sub-system 30 to be described later. Part.

In addition, in FIG. 1 and FIG. 2, the protection switch electric apparatus 10 has the center block plate 32 which the latch type tripping mechanism 31 (henceforth simply a latch) is common to all poles. That is, it is arrange | positioned in the direction perpendicular to the center surface P in a comparatively thin partition plate.

1 is a partial view of an embodiment of the latch 31 in the closed position, the latch 31 being a pivot hook 33 and an opening member 39 for operating the pivot hook 33. Consists of. At this time, the tip of the pivot hook 33 passes through the slot 36 in the side wall 31a of the latch toward the magnetic thermal tripping subsystem (hereinafter simply referred to as "subsystem") 30, Engagement with the bearing surface of the hole 37 near the top of the flat strip member 38 adjacent the side wall 31a.

In this embodiment, the striker of the electromagnetic tripping device 29 of each pole is a pivoting lever 41, which is normally near the bottom of the strip member 38 (FIG. 1). Engaging with the bearing surface of the hole 42 which extends, it extends as far as possible toward the center surface P via the slot 43 formed in the side wall 31a of the latch 31.

In FIG. 1, the contact bridge 17 is biased in the direction of closing the contact by the return spring and pressure spring 44 which presses the bottom of the casing 11 and the contact bridge 17 loads the bridge. At the same time it may be operated in the direction of opening the contact by a plunger 45 forming a member common to all poles, with a number of plungers corresponding to the number of poles.

When a short circuit is detected by the electromagnetic tripping device 29 of each pole, the plunger 45 passes through the strip member 38 which is moved in parallel with the center plane by the traction force exerted when the striker lever is pivoted. It is displaced by the lever 41 (which, after tripping of the latch 31, rotates in a plane approximately crossing the center plane, and the response time of the latch is longer than the strike time of the striker lever 41). The striker lever 41 quickly opens the contact, while at the tripped position the opening member 39 of the latch 31 confirms the opening of the contact and moves in parallel to the center plane (see FIG. 2). .

In Fig. 1, the plunger 45 is coupled to the tripping bridge 48 shown in Figs. 1 and 2, which is operated by the thermal tripping device 28 of each pole in response to the detection of electrical overload. It is also displaced by the opening member 39 of the latch 31 after the latch 31 is tripped by (not shown) or manually.

Therefore, the dipole contact circuit interruption is obtained by each operation mode (circuit interrupt mode or manual switching mode), and the arc extinguishing device 49 is connected to each contact chamber.

1 and 2, an open or " off " pushbutton 50 for tripping the latch 31 and a reset close or " on " pushbutton 51 are disposed on the partition plate 32, It protrudes from the front of the casing 11. Each push button may be replaced with a rocker-type button or a single reset / on / off rotation knob as long as it does not depart from the scope of the present invention.

The strip member 38, the opening member 39 and the striker lever 41 are in the up position under the normal operating conditions (FIG. 1), and the on push button 51 is pressed down. In addition, when the electromagnetic tripping device detects a short circuit, the three members are in the lowered position (FIG. 2), whereas only the opening member 39 is used when the thermal tripping device detects an electrical overload or presses off. It is in the lowered position when the button 50 is pressed down.

In FIG. 3, the thermal tripping device 28 of the subsystem 30 of each pole is made of a conductive material of thickness e lying on the first free end 56 and the plane RR perpendicular to the plane QQ '. A thin, rectangular thin bimetallic strip 55 lying on the plane QQ, having a second end or a foot portion 57 fixed to a substantially rectangular support plate 59 formed by any suitable fixing means. Doing. 3 also shows that larger surfaces 55a and 55b of opposing surfaces of the bimetal strip 55 lie in a plane QQ parallel to the longitudinal direction of the support plate 59.

In the embodiment shown in FIG. 3, furthermore, in the thermal tripping device 28, a heater strip 61 is provided with suitable electrical insulation means, in this embodiment a bimetal strip between the ends 56 and 57. FIG. It is attached to the bimetal strip 55 via a rectangular, electrically insulating thin sleeve 62 almost enclosing 55. In the heater strip 61, the first end 64 is electrically connected to the conductive portion 23 (see FIGS. 1 and 2) mounted with the fixed contact 21, and the second end ( 65 is joined, for example welded, on a bimetallic strip 55 to a feature point near its free end 56.

In the bimetal strip support plate 59, the first portion 67 having a width of l is provided with a heat tripping device 28 at its distal end, and the second portion 68 has two transverse step portions. (69) (only one is shown in FIG. 3), the width is narrower than that of the first portion, and in the support plate 59, the portion 70 bent at 90 ° from the tip of the second portion 68 It is opposite to the bimetallic strip.

3, the length of the said subsystem 30 is longer than the length of the said support plate 59, and the width L is the 1st part 67 of the support plate in which the said bimetal strip 55 is mounted. In the same manner as that, the insulating substrate 72 is formed into a rectangular shape having a remaining end 73 and a rear end 74. In addition, the insulating substrate 72 is formed with an insulating longitudinal lip portion 78, 79 at its vertical edges 76, 77, respectively, and their height h is It is slightly larger than the thickness e of the support plate 59. These lip portions 78 and 79 are formed by assembling the thermal tripping device 28 and its support plate 59, and then supporting plate 59 for supporting the bimetal strip 55 on the upper surface of the substrate ( When mounted flat relative to 81, two transverse steps 69 in the support plate 59 are positioned to be pressed against the respective lip of the substrate 72. Thus, the bimetal strip is placed near the front end 73 of the substrate 72, as shown in FIG. In addition, when the combination of the support plate 59 and the thermal tripping device 28 is mounted on the substrate 72 (see FIGS. 3 and 4), the substrate 72 includes the first portion of the support plate 59. An insulating fixing peg 83 is engaged with the hole 84 in 68.

In addition, in FIG. 3, the striker-type electromagnetic tripping device 29 of the subsystem 30 for each pole has a winding frame 86 formed of an insulating material. Parallel flanges 87 and 88 are separated by the same spacing as the two lip portions 78 and 79, and at the top thereof, as shown in FIGS. 1 and 2, the control coil ( 91 is joined together in the transverse direction by a planar spacer 89 perpendicular to the top surface of the hollow tube 90 on which it is wound.

1 and 2, the electromagnetic tripping device 29 is housed inside the hollow tube 90 of the winding frame, and the cylindrical fixing core 92 and the fixing core 92 are axially oriented. And a magnetic circuit formed by a slidable movable collar 93 which forms a cylindrical plunger arranged in a row. The fixed core 92 is fixed to the upper end of the hollow tube 90 by appropriate means, and the spiral return spring 94 is inserted into the surfaces of the fixed core 92 and the movable core 93 that face each other. It is.

The movable core, ie, the plunger core 93, extends in the axial direction by the tail portion 95 protruding from the cavity tube 90 when the core 93 is in the rest position (see FIG. 1). It is coupled to the striker lever 41 of the electromagnetic tripping device.

In the embodiment shown in FIGS. 3 and 5, the striker lever 41 has two parallel arms 96, 97 (one of which an arm 96 is longer than the other arm 97). 6, the tail 95 of the plunger core 93 is inserted between the two teeth of the coupling fork 98, and is laterally engaged by the coupling fork. Construct a striker arm.

5, each end of each of the flanges 87 and 88 of the winding frame 86 is formed at the base of each of the outer surfaces of the two arms 96 and 97 of the striker lever 41. As shown in FIG. Two coaxial pivots 101 and 102, which are configured to be inserted into respective holes 103 and 104 in 105 and 106, are provided.

In addition, the striker lever 41 is preferably formed of an insulating material.

On the other hand, in FIG. 3, the winding frame 86 of the electromagnetic tripping device 29 is also provided with two parallel portions extending the two flanges 87 and 88 to the rear as part of the spacer 89. One vertical flange 109, 110 is formed, and each of these bases is integrally formed with the substrate 72 at the rear end 74 of the substrate 72 to form the substrate 72. It is connected together in a horizontal direction by a vertical web 112 configured to cooperate with an insulating stud 113 arranged horizontally on the upper surface 81.

3, the electrical connection terminal 27 associated with the subsystem 30 is configured to be received between two flanges 109, 110 of the winding frame 86. As shown in FIG. The electrical connection terminal 27 is in the form of a screw and stirrup in this embodiment, and is connected to the conductive portion 115 as can be seen from FIG. The conductive portion 115 has a flat first branch portion 116 having a threaded hole portion 117 at the center for accommodating the electrical connection terminal 27, and each flange 109 of the winding frame. , Two side protrusions 118 (only one is shown in FIG. 3) that fit into the respective slots 119, 120 at 110. FIG. In addition, the conductive portion 115, the second branch portion 122 configured to be perpendicular to the first branch portion 116 so as to lie side by side with the control coil 91 with respect to the upper end of the hollow tube 90 It also has a third branch portion 123 configured at right angles to the second branch portion 122 so as to partially support it (see FIGS. 1 and 2). In addition, the third branch portion 123 has a portion 124 bent at 90 degrees.

3, when assembling the electrical connection terminal 27 and the striker type electromagnetic tripping device 29, the coil 91 is provided with a control coil 91 around the cavity 90 of the winding frame 86. Inserting the plunger core 93 into the cavity tube 90 and attaching its tail 95 to the striker lever 41, and then attaching the striker lever 41 to the two flanges 87, ( 88) pivotally mount. Next, the return spring 94 and the fixing core 92 are inserted into the cavity 90, and two inside the flanges 109 and 110 of the winding frame are inserted into the slots 119 and 120, respectively. By inserting the protruding portion 118, the conductive portion 115 connected to the electrical connection terminal 27 is fixed to the winding frame 86, and the control of the portion 124 bent at 90 degrees of the conductive portion 115 is performed. One end portion 91a of the coil 91 is supported.

4 shows the assembly of the electrical connection terminal 27 and the striker type electromagnetic tripping device 29. As shown in FIG.

As shown in FIG. 4, after the combination of the support plate 59 and the thermal tripping device 28 is inserted into the substrate 72, the striker-type electromagnetic tripping device 29 and the electrical connection terminal 27 are assembled. The two flanges 87 and 88 of the winding mold 86 are engaged on the two lip portions 78 and 79, and the web 112 of the winding mold 86 is loaded with tenons and tenons. The striker type electromagnetic tripping device 29 / electrical connection terminal combination is mounted on the substrate 72 by engaging with the stud 113 by a coupling fixing means such as the above.

7 shows the subsystem 30 assembled in this way. At this stage, both ends 91a, 91b (see FIG. 3) of the control coil 91 are operated at 90 ° of the conductive portion 115, as shown in FIGS. 1 and 2, in a single operation. Electrical connections, for example, are welded to the curved part 124 and the part 70 of the bimetal strip support plate 59, respectively.

However, the height and position of the insulating fixing pegs 83 (see FIG. 3) are the tails of the plunger core 93 in the rest position, as shown in FIG. 11, when the subsystem 30 is assembled. An end portion of the portion 95 is supported on the peg 83.

In FIG. 7, when the subsystem 30 is assembled, the cavity 90, which houses the bimetal strip 55 and the magnetic circuits of the electromagnetic tripping device 29, is parallel in the cavity plane and pivot lever 41. The striker arm 96 extends axially to one of the larger surfaces of the bimetallic strip 55 and is not obstructed by the bimetallic strip. That is, in the stop position (see FIG. 7), the striker arm 96 is at substantially the same height as the foot of the bimetal strip 55 and extends beyond the front end 73 of the substrate 72.

7 and 8, the lower surface 128 of the substrate 72 has two black shape insulating members 129 near the rear end 74 of the substrate (only one is shown in the figure). The first end branch 130 (Fig. 8) in the plane of the conductive portion 23 shown in Fig. 9 is inserted between these insulating members, and the conductive portion 23 is turned over. In the state, the fixed contact 21 is mounted on the lower surface 131 (see FIG. 10). The front end portion 73 of the substrate 72 is opposed to the first end portion of the conductive portion, that is, the fixed contact holder portion 23, and at the second end portion portion 136 of the plane bent at 90 degrees. It is preferable that the insulating cross member 133 having the coupling means 134 (FIG. 8) coupled with the notch 135 formed is integrally formed with the substrate 72.

Therefore, the fixed contact holder portion 23 forms an integral part with the subsystem 30, as shown in FIG. 8, and when it is fixed to the subsystem 30 (FIG. 8), the fixed contact holder portion 23 is fixed. The second end branch portion 136 of the contact holder portion 23 is electrically connected to, for example, welded to, the first end portion 64 of the heater strip 61 of the heat tripping device 28.

8, longitudinal guide ribs 140 are formed on the flanges 87 and 88 of the winding frame 86 on the substrate 72 of the subsystem 30. 140 is a longitudinal groove formed in the two gap walls 11a and 11b of the casing 11 when the subsystem 30 to which the fixed contact holder portion 23 is fitted is mounted in the casing. 142 (FIG. 11), it is comprised so that it may slide.

1 and 2, after mounting the subsystem 30 provided with the fixed contact holder portion 23 inside the casing 11, the substrate 72 of the subsystem 30 has a center surface P. As shown in FIG. Stretch vertically in a direction perpendicular to the.

Starting from the contact closure position as shown in FIG. 1, the electrical overload detected by the bimetallic strip 55 deflects the bimetallic strip to operate the tripping bridge 48, and controls the control device represented by arrow F. FIG. Operation on the pivot hook 33 releases the hook 33 from the strip member 38. Thereafter, the hook 33 makes the latch 31 pivotable in the clockwise direction and trips, and the opening member 39 moves downward to hit the plunger 45, thereby attracting the contact bridge 17, Go to open the contacts.

On the other hand, when a short circuit is detected by the striker type electromagnetic tripping device 29, the plunger core 93 (FIG. 1) is pulled toward the fixed core 92 and pivots the striker lever 41 coupled thereto. When pivoting, the lever 41 pulls the strip member 38 and moves downwards to open the pivot hook 33 from the strip member, and the open pivot hook 33 pivots clockwise, The latch 31 is tripped. After the latch 31 is tripped, the response time is longer than the strike time of the pivoting lever 41, so that the lever hits the plunger 45, at which time the plunger 45 pulls the contact bridge 17 Opens the contact, which is confirmed by the downward movement of the opening member 39 relative to the plunger 45 (FIG. 2). The combination of the striker lever 41 and the plunger core 93 is returned to the position of FIG. 1 by the return spring 94, and the strip member 38 is raised by the return movement of the striker lever 41. As shown in FIG.

Claims (8)

At least one pole current path formed between two electrical connection terminals 26 and 27 and provided with at least one movable contact 18 or 19 that cooperates with the fixed contact 21; A self-heating tripping subsystem 30 for the pole current path is provided in the casing 11; The self-heating tripping sub system has a bimetal strip 55 having one end electrically connected to the fixed contact and instructing the opening of the fixed contact in response to an overload current to the flat conductive support 59 vertically. The thermal tripping device 28 and the control coil 91 are wound around the tube 90, and in response to the winding frame 86 of the insulating material and the short circuit current configured such that the movable core 93 is slidable in response to the short circuit current. In a protective switch electrical device comprising an electromagnetic tripping device (29) having a lever (41) instructed by the movable core (93) to open a stationary contact, the magnetic thermal tripping subsystem (30) is fixed In addition to having a front end portion 73 near the contact point 21, the substrate 72 of an elongated insulating material for fixing and holding the support portion 59 on which the bimetallic strip 55 is mounted and flat is further provided. remind The lever 41 of the electromagnetic tripping device 29 extends in an axial direction with respect to the bimetal strip 55 beyond the front end 73 of the substrate 72 and is pivotably mounted. Device. 2. The protective switch electrical apparatus according to claim 1, wherein the support part (59) of the bimetal strip and the winding frame (86) overlap each other and are fixed to the substrate (72) by coupling means, respectively. 3. The two larger surfaces 55a, 55b of the bimetallic strip 55 lie in a plane parallel to the longitudinal direction of the support 59, and the lever 41. ) Is a striker lever for a movable contact support. 4. The striker lever (41) according to claim 3, wherein the striker lever (41) is located near the upper surface (81) of the coaxial pivot (101) (102) and (102) of approximately the same height as the foot of the bimetal strip (55). And a member (98) coupled to the movable core. 3. The winding frame (86) according to any one of the preceding claims, wherein the winding frame (86) has two parallel front flanges (87) and (88) with bearings (103) and (104) for pivoting the lever (41), respectively. And two parallel rear flanges (109, 110) for accommodating the connection terminal (27) therebetween. 3. The substrate 72 according to claim 1 or 2, wherein the substrate 72 has a fixing peg 83 inserted into the hole portion 84 in the bimetal strip support 59 on its upper surface 81, so that the substrate 72 has the fixing pegs 83 at the stop position. A protective switch electrical device, characterized in that the movable core (93) is configured to rest on the peg. 3. The substrate 72 has members 129 and 134 for supporting the holder portion 23 on which the fixed contact 21 is mounted, respectively, the lower surface 128 of the substrate 72. A protective switch electrical device, characterized in that provided at the front end (73) side. 6. The magnetic thermal tripping subsystem 30 is disposed in the casing according to claim 5, wherein the substrates 72 of the magnetic thermal tripping subsystem and / or the flanges 87 and 88 of the winding frame 86 are housed in the casing. A protective switch electrical device, characterized in that the guide rib 140 is provided in the groove 142 formed in the casing (11) when mounted.