CN201289830Y - Electrical installation switch device - Google Patents

Abstract

The utility model relates to an electric switch device, in particular to a circuit protection switch. The electric switch device includes a magnetic circuit breaker with an armature, a thermal circuit breaker, fixed and movable contacts, and can be tripped by the thermal circuit breaker and the magnetic circuit breaker. Switch lock comprising an engagement point formed by a release lever and a detent lever which is rotatably mounted in a fixed position and has an elongated hole for guiding the bow, wherein the contact point for opening the contact point in the event of a short circuit The armature can act on the contact lever with movable contacts, and the switch lock can permanently keep the contact lever in the off position. The electrical switching device also includes a switch knob and an intermediate lever. The switch knob is used to manually operate the switch For a lock, the middle lever is hinged at one end to the contact lever and at the other end to a bow, wherein the bow is hinged with at least one leg to the switch knob. The contact rod forms a first component which can be prefabricated into the housing of the mounting switching device and which, after insertion into the housing, is pivotably mounted on a rotational axis which is fixedly connected to the housing. Together with the release lever, the detent lever, the intermediate lever and the bracket, the switch knob forms a second component which can be prefabricated into the housing and which, after insertion, is hingedly connected to the first component at a separation point.

Description

Electrical Installation Switchgear

technical field

The utility model relates to an electrical installation switch device according to the preamble of claim 1, in particular to a circuit protection switch.

Background technique

Mounted switching devices of this type generally have contact points formed by fixed and movable contact pieces, wherein the movable contact piece is held on a pivotably mounted contact lever. Furthermore, installation switchgear of this type includes a magnetic circuit breaker with an armature, and a switch lock with an engagement point tripped by a thermal or magnetic circuit breaker. The engagement point is formed by a release lever and a detent lever which is rotatably mounted in a fixed position and has an elongated hole for guiding the bracket. In the event of a short circuit, the armature can act on the contact lever with the movable contact piece in order to open the contact point, and the switch lock can permanently hold the contact lever in the open position. In addition, this type of installation switch device includes a switch knob and an intermediate lever, the switch knob is used to manually operate the switch lock, and the intermediate lever is hinged on one end with the contact lever and on the other end with the bow, wherein the bow At least one leg is hinged to the switch knob.

In installed switching devices of this type, the contact lever is acted upon by a contact pressure spring which is guided on the contact lever in such a way that it presses the movable contact piece against the fixed contact piece in the ON position. , while pushing the movable contact away from the fixed contact in the disconnected position.

Here, the intermediate lever is the connecting part between the switching mechanism and the contact lever.

In the ON position, the contact lever is held by the intermediate lever which is engaged by the switching mechanism. The engaged switching mechanism clamps a first displacement pivot point of the contact lever in the first position, so that the contact pressure spring can press the contact lever against the stationary contact piece about this first pivot point.

In the released or disconnected position, the intermediate lever is released from the switching mechanism. The switching mechanism is tripped and the first point of rotation is released, so that the contact pressure spring can press the contact lever about the second point of rotation, which is fixed, into the disconnected position, in which the movable contact part is connected to the fixed The contacts are separated.

In the event of thermal or short-circuit current interruption, the switching mechanism is tripped by means of a release lever by the thermal or electromagnetic circuit breaker, so that the switching mechanism can pass from the on state to the off state. Since the disconnection by the tripping switching mechanism is slower than is permissible in the case of quick disconnection due to the inertia of the participating components, the movable contact lever is additionally knocked open directly by the armature for rapid disconnection in the case of electromagnetic rapid disconnection. Open contacts.

Installed switching devices of this type are known, in which the switching mechanism and the contact lever can be assembled in the form of a prefabricated assembly between two plate parts and integrated into the device as a whole when assembling the device. In order to connect the switching mechanism with a thermal and/or magnetic circuit breaker, the trip slide also needs to be inserted later. EP 0144799 A1 shows an example. Here, offsets and inclinations between the individual levers of the switching mechanism can occur due to manufacturing tolerances when assembling the plates. If the contact lever is struck by the fast circuit breaker when the short-circuit is switched off, the contact lever hits a stop located within the range of the plate, so that the plates continue to move relative to each other and, over time, the shifting lever of the switching mechanism The gap between may be too large for accurate functionality. The result may be insufficient shape and positional stability of the contact rod. Furthermore, the production of the switching mechanism is rather complex and expensive due to significant tolerances and riveted connections.

DE 10 2004 055 564 A1 shows a built-in switching device with a switching mechanism, the parts of which are successively inserted into the housing together with the contact rod. Here, the switching mechanism including the contact lever is no longer used as a prefabricated component, but rather it is formed, so to speak, in the housing. The thermal disconnector and the contact lever are located on different sides with respect to the magnetic disconnector, so that in the extension of the switching mechanism, here also the trip slide needs to be mounted separately between the thermal disconnector and the switching mechanism.

This structure should be suitable for fully automated manufacturing, but it requires highly accurate feeding and positioning of parts, which makes manufacturing automation very complex and expensive.

Contents of the invention

It is therefore the object of the present invention to provide a mounting switch device of this type which can be produced not only manually but also fully automatically at low cost and which additionally has a high form and positional stability of the contacts sex.

This object is solved by a mounting switchgear of this type having the features of the characterizing part of claim 1 .

According to the invention, the contact rod constitutes a first component which can be prefabricated into the housing in which the switching device is installed, which component is pivotably mounted on a rotary shaft which is fixedly connected to the housing after being installed in the housing, and Together with the release lever, the detent lever, the intermediate lever and the bow, the switch knob forms a second component which can be prefabricated into the housing and which, after insertion, is hingedly connected to the first component at a separation point. This second component is also referred to below as a link chain.

According to a particularly advantageous embodiment of the invention, the separation point is formed by the connection point between a free end of the intermediate rod and a free end of the contact rod. In this case, the connection point can be formed, for example, by a pin formed at a free end of the contact rod, which engages in a hole provided at a free end of the intermediate rod.

These two components can be manufactured and pre-tested independently of each other. By separating the function of the switch lock with the contact lever in the two components, each component itself can be designed more simply than if all functions are included in a single component. Thus, each of the two inventive assemblies can be manufactured more simply and reliably. The joining is done at the point of separation within the housing. For functionality, only two components need to be put into the housing during assembly. This can be done either simply by hand or with the aid of an automatic manufacturing machine. Here, the requirements on the automatic manufacturing machine are negligible, since only two components need to be manipulated and positioned instead of a large number of individual parts.

According to a particularly advantageous refinement of the invention, in the disconnected position the movement path of the contact lever is limited by the abutment against a stop which is fixedly connected to the housing. The stop absorbs the impact of the contact rod when the contact rod is struck by the magnetic circuit breaker in the event of a short circuit. Therefore, the switching mechanism itself is not loaded by the impact of the contact rod, and no deformation or deflection occurs between the individual rods constituting the switching mechanism, resulting in a durable and precise structure with almost no play.

In a further particularly advantageous embodiment, the installation switching device according to the invention comprises a striker lever which is pivotally mounted in the stationary shaft, via which both the armature and the thermal disconnector act on the release lever. The striker lever thus establishes the connection between the thermal or magnetic circuit breaker and the switch lock with the engagement point. The thermal disconnector and the magnetic disconnector can thus be designed as separate components and installed in the housing independently of one another after the contact rod and the link chain have been installed.

In a particularly advantageous embodiment of the invention, the striker lever can be a double-armed lever, wherein, in another particularly advantageous embodiment, the armature and the thermal circuit breaker act on the first lever arm of the striker lever and When activated, the lever arm is swung so that the second lever arm of the strike lever acts on the lever arm of the release lever and swings this lever arm so that the joint between the release lever and the pawl lever is released.

During almost every switching operation that opens the contacts, whether under rated current load or in the event of a short circuit, an arc briefly occurs at the contact points, which causes local slight burn out. During the service life of such an installed switching device, the thickness of the contacts is thus reduced. The reduction in thickness is compensated for by the subsequent lowering of the contact rod, so that there is a good areal contact between the contact parts even when the thickness of the contact parts is reduced. However, the closer the contact rod is moved towards the fixed contact piece during the subsequent lowering, the lower the contact pressure which enables the contact pressure spring to act on the contact rod. In the absence of sufficient contact pressure there is the danger that the contact resistance in the closed contact becomes too great, so that an impermissibly high degree of heating occurs at the contact, or even a series of small spark discharges . In order to prevent this from happening, the contact rod is prevented from continuing to follow the descent when below a certain thickness of the contact piece.

In known mounted switching devices, the contact piece is designed to be very thick and thus overdimensioned, or the subsequent lowering of the contact rod is limited by the length of the elongated hole in which the contact rod is placed in a positionally fixed second swivel on axis. In the engaged state, ie when the contact lever is pressed against the fixed contact piece about the first pivot point, the second fixed axis of rotation lies in the inner region of the elongated hole. The smaller the thickness of the contact piece becomes, the closer the end of the long hole is to the fixed second rotation axis. When the second stationary axis of rotation finally abuts against the edge of the elongated hole, further pressing of the contact rod onto the stationary contact piece is no longer possible, and the subsequent descent is stopped. However, the contact pressure is already lost by the abutment of the second stationary axis of rotation on the edge of the elongated hole, so that the contact pressure is already reduced to the extent that the follow-up descent is just as reliable. On the other hand, due to manufacturing tolerances when punching the elongated holes, the limit points for following the descent deviate from each other in the individual devices.

In order to improve this situation, in the installation switching device according to the invention, in another particularly advantageous embodiment, the subsequent lowering of the contact rod towards the fixed contact piece is limited by a fixed stop. In a particularly advantageous embodiment, the stop can be formed by a housing projection. The stop can also be realized by a separate mounting part which is fixed in place and positively or even materially connected to the housing. The invention has the advantage of limiting the trailing descent by means of a fixed stop in that no contact pressure is lost and an improved reproducibility of the limit limit from one device to another is achieved. According to the invention, the limiting effect of the follow-down is removed from the elongated hole and assigned to a separate component, namely the stop. As a result, the stop can be optimized for its sole function in terms of its position and embodiment, so that the mounting switchgear according to the invention has an improved performance overall.

In a particularly advantageous embodiment of the invention, the position of the stop in the device corresponds to the movement path of the release lever in such a way that the contact lever does not hinder the pivoting of the release lever when it abuts against the stop.

Further advantageous refinements and developments and further advantages of the invention emerge from the subclaims.

Description of drawings

The utility model as well as further advantageous refinements and developments of the utility model are explained and described in detail with the aid of the drawings which show exemplary embodiments of the utility model.

Fig. 1 shows the internal view of the installation switch device of the present invention when the contact point is disconnected;

Fig. 2 shows the interior view as in Fig. 1 in the manufactured state not yet loaded into the link chain;

Fig. 3 shows the inner view of the mounting switch device of the present invention when the contact points are closed;

Figure 4 shows an exploded view of the link chain;

Figure 5 shows the assembled joint chain as shown in Figure 4;

Figures 6a-d show the various assembly steps when installing the release lever into the switch knob;

Fig. 7 shows a schematic diagram of the follow-up decline of the contact rod limited by a fixed stopper; and

FIG. 8 shows a schematic diagram of the interaction of the crash pin with the crash bar and the direct action of the crash pin on the contact bar.

Detailed ways

Referring now first to FIGS. 1 to 4 .

The installation switching device generally designated by the reference number 10, here a circuit breaker, has a housing which consists of two housing halves, of which only the first housing half 11 is partially shown . The housing half-shell 11 has, like the supplementary, not shown second housing half-shell, a front front wall 12 and two rear front walls, of which only one rear front wall 13 can be seen in FIG. The front facade and the two rear facades are connected to one another by front side walls, of which only one front side wall 14 is visible in the figure. Furthermore, the rear narrow side walls belonging to the housing, as well as the fastening face and the wide face of the housing are not visible in the illustration in FIG. 1 .

Of course, the possibility also exists to use only one housing half-shell, which is closed by means of a cover. In the case of two housing half-shells, the width of each housing half-shell corresponds to half the standard module width. If a single housing half-shell is closed by means of a cover, the housing half-shell accordingly has dimensions selected such that it reaches the module width together with the cover.

A hole 17 is provided in the front face wall 12 through which an operating handle 18 of a switch knob 19 protrudes. The switch knob 19 has a hole which can be regarded as a virtual rotation axis of the switch knob. Fork-shaped projections 21 , 22 are provided on the side diametrically opposite the operating handle 18 , of which only one projection 21 is visible in the illustration in FIG. 1 . The two fork-shaped projections 21 , 22 can be seen in the perspective view of FIG. 6 d. The two protrusions 21 , 22 leave between them a receiving space 23 which is open on one side. Each of the two protrusions 21 , 22 has an eyelet 24 , 25 at its end facing away from the operating handle 18 . The longitudinal center axis of the joystick 18 extends through the center of the eyelets 24 , 25 .

A leg 26 of the U-shaped bow 27 engages with its guide extension 28 in the eyelet 24 , as shown in detail in FIG. 4 . The second leg 29 of the bracket 27 engages with its guide extension 128 in the eye 25 of the second projection 22 of the switching knob 19 .

The bow connection 30 connecting the two U-legs 26 , 29 engages in the two bayonet openings 31 , 32 of the intermediate rod 33 . For this purpose, the intermediate rod 33 has a U-profile at its one end, which terminates in two fork-shaped projections 34, 35, wherein the two fork-shaped projections 34, Each of the projections 35 has a bayonet 31 , 32 respectively at the end.

At the same time, the bow connection 30 engages and passes through the elongated hole 36 of the detent lever 37 which is arranged below the intermediate lever 33 and partly over the two end projections 34 of the intermediate lever 33 , 35 extending within the U-shaped gap between them. The U-shaped bracket 27 is thus guided with its bracket connection 30 in the elongated hole 36 of the detent lever 37 , while the intermediate lever 33 is articulated to the bracket connection 30 by means of its bayonet openings 31 and 32 . Thus, the switch knob 19 , the intermediate lever 33 and the detent lever 37 form an assembly interconnected by the bow 27 .

Formed on both sides on the detent lever 37 are journals 38 , 39 , by means of which journals the detent lever is mounted in the housing of the two half-shells in a stationary and rotatable manner in the two housing halves, Alternatively, in a housing with a single half-shell with a cover, it is mounted stationary and rotatable in the housing half-shells and the cover.

The direction of longitudinal extension of the center lever 33 , the detent lever 37 and the legs 26 , 29 of the bracket 27 is parallel to the broad side of the device housing.

The release lever 40 is rotatably mounted about a fixed shaft 20 . The release lever is designed to be approximately L-shaped, see FIG. 6, wherein its first arm 41 has a joint at its free end, which has an annular hole 42, by means of which the joint can be It is mounted rotatably on a stationary shaft 20 . Its second arm 43 is formed approximately at right angles to the first arm 42 . The first arm 41 has a stop surface 44 approximately in its middle.

The first arm 41 of the release lever 40 has a stop lug 45 on the annular end face of the annular hole 42 . The release lever 40 is inserted with its first arm 41 into the receiving space 23 between the two fork-shaped protrusions 21, 22 of the switch knob 19, so that the central axis of its annular hole 42 is aligned with the central axis of the hole of the switch knob 19. coincide. Here, the hole of the operating handle is located on a flange 120 surrounding the annular hole 42 , on which it is rotatably held. The release lever 40 is held swingably on the shaft 20 , and the switch knob 19 is held swingably on the release lever 40 .

The stop lug 45 clamps the spring 46 .

In this way, the release lever 40 is added to the assembly formed by the connection of the switch knob 19 , the intermediate lever 33 and the detent lever 37 via the bow 27 .

On its free end, the detent lever 37 has a lug 49 which, together with the stop surface 44 on the release lever 40 , forms the engagement point of the switch lock in the engagement position of the release lever 40 . FIG. 3 shows the circuit protection switch 10 including the engaged switching mechanism. In the engaged position, the release lever 40 is pivoted clockwise in the view of FIG. 3 in the direction of the detent lever 37 .

The spring means 46 comprises two protruding arms 47, 48, wherein the arm 47 engages on the switch knob 19 and the arm 48 engages on the release lever 40, which is directed towards its engaged position by the pretensioned spring means 46. direction, ie clockwise in the view of Figure 3, and clamps in the engaged position without the action of opposing forces.

Release lever 40 , switch knob 19 , intermediate lever 33 and detent lever 37 thus form a connected prefabricated assembly, which is also referred to below as link chain 50 . The link chain 50 may be prefabricated and pretested as a single assembled component.

Referring now to FIG. 4, the various steps in assembling the link chain are shown in exploded view. In a first step marked with arrow P1, the leg 29 of the bow 27 is passed through the elongated hole 36 so that the bow connection 30 is guided displaceably in the elongated hole 36 and the detent lever 37 rests on the bow 27. Extends between the two legs 26,39. In a second step marked with arrow P2, the intermediate lever 33 is clamped with its terminal bayonet 31 on the bow connection 30, so that its terminal projections 34, 35 cover and surround the detent lever 37. In the third step marked with arrow P3, the bow 27 is inserted into the eye provided on the protrusion 21, 22 of the switch knob 19 with its guide extension 28, 128 formed on the end of the leg 26, 29. Inside the holes 24,25. Finally, in a fourth step marked with arrow P4, the release lever, in which the spring device 46 has previously been inserted, is inserted into the accommodation space 23 between the fork-shaped protrusions 21, 22 of the switch knob 19 and It is stuck in the containing space.

6a to 6d show further details of the spring device 46 and the assembly of the link chain 50 . The spring device 46 is here a helical spring which, in the region of the joint head at the free end of the first arm 41 of the release lever 40 , is pushed onto the outer peripheral surface of the joint head. The joint head has a collar 51 running approximately in the middle on its outer circumference, which serves as a stop for the helical spring of the spring device 46 . Extending from the flange 51 is a shell-shaped cover surface 52 directed toward the end face of the joint head, so that a gap for receiving and guiding the spring device 46 is formed between the outer peripheral surface of the joint head and the cover surface 52 . The end face of the covering surface 52 extends in the manner of a bevel 53 from the stop edge of the flange 51 to the end face of the annular hole 42 and terminates there in an undercut, thereby forming a holding cutout 54 for the spring arm 47 of the spring device 46 .

As shown in FIG. 6 a , the spring means 46 is pushed onto the outer peripheral surface of the annular hole 42 , so that the protruding spring arm 48 remains in the other undercut on the first arm 41 of the release lever 40 . In the relaxed spring arrangement 46 the second projecting spring arm 47 is approximately at right angles to the first projecting spring arm 48 . To pretension the spring device 46 , the protruding second spring arm 47 is pivoted clockwise along the bevel 53 until it engages in the retaining cutout 54 . The spring device 46 is now pretensioned. According to the view of FIG. 6c, the release lever 40 comprising the pretensioned spring device 46 is now pushed into the receiving space 23 between the two projections 21, 22 of the switch knob 19, the second spring arm 47 is now radially Protrudes from this pretensioned spring arrangement. At the same time, the protruding second spring arm 47 is supported on the intermediate connecting portion 55 of the switch knob 19 extending between the two projections 21 , 22 .

The link chain 50 is thus assembled, its parts are hingedly connected to each other, and the release lever 40 is pretensioned in its engaged position by the spring device 46 .

See Figure 1 again now. The intermediate rod 33 has a hole 60 at its end facing away from the bracket 27 . At this hole, the intermediate rod is articulated to a contact rod 62 by means of a cylindrical pin 61 .

The contact lever 62 is designed as a double-armed lever and is rotatably mounted in the elongated hole 66 on the shaft 63 which is fixedly connected to the first housing half-shell 11, so that the first rod part 64 of the stationary shaft 63 points forward The front wall 12, while the second shaft portion 65 of the stationary shaft 63 points towards the fastening surface of the housing. At the free end of the first shank 64 , this shank has a pin 61 positively connected thereto. This pin 61 thus constitutes the connection point between the link chain 50 and the contact rod 62 .

The first bar 64 has a U-shaped profile comprising a receiving space 67 formed by legs extending substantially parallel to the wide face of the housing, the receiving space is open towards the front side wall 14, and the receiving space has a One leg has a hole so that the receiving space 67 can be accessed from the wide side of the separated housing half-shell in the open housing.

The second shaft 65 has a movable contact piece 68 at its free end.

In the design shown in FIG. 1 , the contact pressure spring 69 pushes the contact rod 62 clockwise around the fixed axis 63 , thus pushing the movable contact piece 68 away from the fixed contact piece 70 . It is supported with one end on the front side wall 14 of the housing and with its other end in the receiving space 67 of the first rod part 64 . Here, the movement path of the contact rod 62 is limited by a stop 71 which is fixedly connected to the first housing half shell, in other words, in the cut-off position, the contact rod 62 abuts against the fixed stop 71 superior. The fixed stop 71 is realized by a pin connected integrally with the housing half-shell, which pin can be produced together with the housing half-shell in an injection molding process, for example.

See Figure 3 now. Here, the line protection switch is shown in the ON position. The operating handle 18 is in the ON position, and the lug 49 on the pawl lever 37 engages with the stop surface 44 on the release lever 40 . The intermediate rod is thus blocked, while the pin 61 at the connection point between the articulated chain 50 and the contact rod 62 now constitutes the axis of rotation of the contact rod 62 . Around this axis of rotation 61 , a contact pressure spring 69 pushes the contact lever 62 counterclockwise, thus ensuring contact between the movable contact piece 68 and the fixed contact piece 70 .

Furthermore, the coil 72 of the magnetic circuit breaker 73 and the metal strip 74 made of a thermal bimetal or shape memory alloy can be seen as part of the thermal circuit breaker 75 . In the arrangement shown in FIGS. 1 and 3 , the contact lever 62 and the contact point formed by the movable and fixed contact pieces 68 , 70 are located between the magnetic circuit breaker 73 and the thermal circuit breaker 75 . In other words, the magnetic disconnector 73 and the thermal disconnector 75 are located on different sides with respect to an imaginary plane extending through the contact rod 62 , which plane is perpendicular to the first housing half-shell 11 .

In the cut-off condition, the magnetic circuit breaker 73 or the thermal circuit breaker 75 should break the engagement point formed by the lug 49 provided on the detent lever 37 and the stop surface 44 provided on the release lever 40, thereby switching The lock is released and the contact lever 62 can be transferred via the contact pressure spring 69 into the open position shown in FIG. 1 . For this, it is necessary to mechanically connect the magnetic and thermal circuit breakers to the release lever 40 . In the embodiment of the present invention shown in FIGS. 1 and 3 , the mechanical connection of the magnetic circuit breaker 73 or the thermal circuit breaker 75 to the release lever 40 is realized by means of a striker lever 77 which is mounted rotatably in a fixed position.

For this purpose, a striker lever 77 designed as a double-armed lever is pivotably mounted on another shaft 76 which is fixedly connected to the housing half-shell 11 .

The first arm portion 78 of the strike lever 77 is directed from the fixed shaft 76 to the fastening surface of the housing. The first arm has an eyelet 79 in which the first leg of the drive bow 80 is movably held.

The second leg of the drive bracket 80 is guided displaceably in a guide groove 81 of the housing. Here, the side walls 82 of the guide groove 81 are designed so deep and the drive bracket 80 is accordingly designed so long that when the metal strip 74 of the thermal disconnector 75 heats up, it follows the direction of the arrow R, ie here When bent counterclockwise, it can pass over the side wall 82 of the guide groove 81 and at the same time pull the drive bow 80 along the direction of the arrow R on the second leg.

By pulling, the transmission bow 80 swings the striker lever 77 clockwise, which therefore acts with its second arm 83 on the release lever 40 in such a way that it counteracts in the direction opposite to the force of the spring device 46 . Oscillating clockwise, the stop face 44 separates from the lug 49 and the engagement point is released.

A corresponding situation takes place during magnetic disconnection. In the event of a short-circuit current, a striker pin driven by the magnetic breaker protrudes over a hole in the end face of the magnetic breaker 73 facing the striker lever 77 and strikes the first arm 78 of the striker lever 77 . As the striker pin strikes from right to left, it also swings the striker bar 76 clockwise, so that the engagement point is thus released.

Furthermore, the strike lever 76 has a lug 84 which protrudes in the direction of the second lever part 65 of the contact lever 62 . If the striker pin now swivels the striker lever 77 clockwise during magnetic disconnection, the lug 84 strikes the contact lever 62 after the engagement point has been released and knocks it into the disconnected position shown in FIG. 1 . Here, the movable contact piece 68 is separated from the fixed contact piece 70 , wherein an arc is generated which is extinguished in an arc quenching device, which is designated here with reference numeral 85 in the figure and is only partially to show. In a known manner, the arc extinguishing device comprises an arc quenching plate stack with a pre-chamber, which can be delimited by a pre-chamber cover parallel to the wide side of the housing, and the arc is guided by means of two arc guides. lead to the pre-chamber.

Here, the impact movement of the contact rod 62 is limited by a fixed stop 71 .

The limitation by means of the fixed stop 71 has the advantage that the shocks transmitted from the striker pin to the contact lever 62 are absorbed by the housing and not by parts of the switch lock. As a result, excessive mechanical loading of the switch lock parts is avoided, so that load-induced deformations and deflections of the switch lock parts also do not occur, while the relative arrangement and position of the individual parts of the switch lock remain as required for reliable function. within narrow tolerances. In particular, it is thus ensured that the contact opening distance can be defined and precisely adjusted and that it does not change over time due to mechanical deformations.

A second protrusion or lug 284 is provided on the striker lever 77 close to the stationary shaft 76 , which is directed toward the contact lever 62 . The second lug 284 is used to limit the swing path of the striker lever 77 when the striker lever 77 is swiveled clockwise in the case of thermal or magnetic cutoff. For this purpose, a second stop 290 is formed in a stationary manner on the inner side of the housing wide area, see FIG. 1 .

The striker lever 77 lies along its longitudinal extent approximately in an imaginary plane which is perpendicular to the housing half-shell 11 and extends through the contact point formed by the movable and fixed contact pieces 68 , 70 . In this way, a compact and space-saving relative arrangement of the subassemblies, ie switch lock, magnetic circuit breaker, thermal circuit breaker, contact lever with contact points, can be achieved.

The switch lock, the contact lever 62 with the contact point, the thermal circuit breaker 75 and the strike lever 77, that is, almost all mechanical moving parts are arranged together in the first half chamber of the housing, which is from a width of the housing. An imaginary plane whose face extends perpendicularly through the midpoint of the axis 20 of the switch knob 19 extends to a narrow face of the housing. The arc quenching device 85 and the magnetic circuit breaker 73 are accommodated in the other half-chamber of the housing, which extends from the above-mentioned imaginary plane to the opposite narrow side of the housing.

In the switched-on position, see FIG. 3 , the drive link 80 and the first arm 78 of the strike lever 77 form an angle of approximately 90°. The second arm 43 of the release lever 40 likewise forms an angle of approximately 90° with the second arm 83 of the strike lever 77 . In addition, the lengths of the first arm portion 78 and the second arm portion 83 of the collision lever 77 are substantially equal. The lever arrangement designed in this way ensures a particularly effective force transmission from the metal band 74 of the thermal disconnector 75 via the transmission bow 80 and the striker lever 77 to the release lever 40, since due to the existing 1:1 lever transmission ratio and the right angle, The tensile force is transmitted undiminished from the drive bracket 80 to the release lever 40 .

See Figure 2 now. There, an assembly step is described in which the contact rod 62 and the contact pressure spring 69 have already been inserted into the housing, but the link chain 50 has not yet been inserted. The assembly takes place in such a way that the contact lever 62 is articulated with its elongated hole on a stationary shaft 63 . The contact pressure spring 69 is then loaded. Here it is advantageous if the first shaft part 64 of the contact rod 62 has a hole in one leg of its U-shaped profile. The contact pressure spring 69 can thus be inserted in a simple manner perpendicular to the housing wide surface into the receiving space 67 of the first rod part 64 , which in particular facilitates automatic assembly. On the housing side, the contact pressure spring 69 is supported on a wedge-shaped projection 86 located on the front side wall 14, wherein the inclination of the support surface 87 relative to the front side wall 14 is selected in such a way that it lies at the contact point of the contact rod. The contact pressure spring 69 is supported on the connection part on the side of the contact rod, so that the contact pressure spring 69 is very large in the connection position of the contact rod 62. It extends somewhat linearly between the front side wall 14 and the contact rod 62 . This ensures a good force transmission from the contact pressure spring 69 to the contact lever 62 and thus a high contact pressure at the contact point.

In the assembly step shown in FIG. 2 , the contact lever is pressed with its second arm 65 against the stop 71 by the contact pressure spring 69 . The contact lever 62 is thus in a well-defined and stable position. This is important because it facilitates the insertion of the link chain 50 as a next assembly step. The joint chain 50 is now inserted in such a way that it is on the one hand articulated and pivotable on the stationary shaft 20 and is also articulated and pivotable on the contact lever 62 by means of the hole 60 of the intermediate lever 33 on the pin 61 of the This mounting is made very easy by the clearly defined position of the contact rod, especially in automatic assembly.

After the joint chain 50 has been installed, the striker bar 77 is finally placed on the stationary shaft 76 and the drive bow 80 engages with its first leg in the hole on the first arm 78 of the striker bar 77 79, and embedded in the guide groove 81 fixedly connected with the housing with its second leg.

Therefore, generally speaking, the mounting switch device of the present invention is designed to be very easy to assemble. By especially in the event of a short-circuit impact on the contact point, a very large impact from the contact rod to the link chain is avoided, the link chain, up to the spring device 46 can be made of plastic parts, which can be easily connected together and clamped to each other. It is not necessary to provide threaded, soldered, welded or riveted connections as is still required in comparable devices of the prior art.

See Figure 7 now. A variant of the mounting switchgear according to the invention is shown schematically here, in which variant the thickness of the fixed and/or movable contacts 168, 170 is greatly reduced due to burnout Next, the subsequent lowering of the contact rod 162 towards the fixed contact piece 170 is limited by the stop 90 which is connected in a stationary manner to the housing half-shell 111 . The stop 90 is designed as a housing projection protruding at a corresponding location within the interior of the housing and is produced together with all other housing components in one injection molding process during the production of the housing half shells by injection molding. The stop can also be realized by a separate, but stationary mounting part that is positively or even materially connected to the housing.

Reference numerals 162 , 168 , 170 designate the contact rod, the movable contact piece and the fixed contact piece when the contact points are closed and without a reduction in thickness due to burning. The contact rods, the movable contact piece and the fixed contact piece are indicated with the reference numerals 162a, 168a, 170a and with broken lines when the contact points are closed and the thickness is reduced due to burnout. It can be seen that where the contact rod 162a is severely burned when the contact points are closed, there is no burning near the striker rod 177 . The contact pressure of the contact pressure spring (not shown in FIG. 7 ) is reduced by the then existing greater distance of the contact rod 162 a from the front side wall 114 of the housing. The subsequent lowering of the contact rod 162a is limited by the stop 90 to values in which a sufficiently high contact pressure is still always ensured by the contact pressure spring. In the event of still greater burnout, the contacts can no longer be closed and the switching device must be replaced. Thus, it is not the case that the switching device is in use and its contacts are closed but do not have a sufficiently high contact pressure. Since in this case an increased contact resistance occurs at the contact points, with the accompanying risk of an impermissibly high degree of heating of the switching device.

The contact pressure spring acts unimpeded on the contact lever until it abuts against the stop. The advantage according to the invention of limiting the trailing descent by means of a fixed stop is that there is no loss of contact pressure and an improved reproducibility of the limit limit from one device to another can be achieved.

Here, the position of the stop 90 relative to the striker lever 177 is selected such that even when the contact lever 162a abuts against the stop 90, the contact lever 162a is connected to the shaft 176 which is pivotably arranged in its fixed position. There is a sufficiently large collision distance 92 between the lugs 184 on the collision bar 177 . Here, the impact distance 92 is so great that in the case of thermal cut-out, when the drive bow is pulled in the direction of arrow P1 in the hole 179 located on the impact lever 177, the impact lever 177 moves clockwise It can also be swung far enough in the direction of arrow P2 to act on the release lever 140 such that the release lever can be swung counterclockwise in the direction of arrow P4 to thereby break the engagement point of the switch lock.

In a variant, the crash lever 177 can also be designed to split along an imaginary plane parallel to the wide surface of the housing. The part facing the inside of the housing half-shell 111 then corresponds to the part 177 shown in FIG. 7 . This part has a lug 184 against which the striker pin 173 of the magnetic circuit breaker 73 acts in the direction of the arrow P5 in the case of a magnetic cut-off. In this variant, the lug 184 can then abut directly against the contact rod 162a without having to observe the collision distance. The mechanical connection to the thermal cutout would take place via the outer part of the striker bar, which has the required strike distance 92 and which is mounted so as to be pivotable or movable relative to the inner part of the striker bar. The impact distance is only necessary in order to allow the impact lever to be caused to pivot by the drive bow engaging in the hole 179 in the event of a thermal cut-off. Here, both the inner and outer parts of the striker bar can act with their second arms on the release lever 140 to break the engagement point of the switch lock when cut off.

The advantage of this variant comprising a split striker bar is that in the case of a magnetic cut-off, the crash contact point proceeds more quickly because the crash bar 177 does not have to first traverse the crash distance 92 in order to strike the contact bar 162 or 162a.

But another kind of modification scheme that does not represent with figure is: bump lever 177 only transmits the motion of the bump pin 173 of magnetic circuit breaker 73 to contact lever 162 or release lever 140, on the contrary, the transmission of the motion of thermal circuit breaker is This is achieved by the direct transmission of the drive bracket to the release lever, that is to say without an intermediary connection of the striker lever, as in the arrangement of the link chain and contact lever otherwise unchanged compared to FIGS. 1 to 3 . In this variant, the drive bow is no longer used as a draw bow, but as a push bow. In this variant, the thermal disconnector is designed in such a way that it bends in the direction of the contact point when it heats up. In the embodiment shown in FIGS. 1 to 3, the metal strip 74 of the thermal cutout 75 bends away from the contact point when it generates heat.

FIG. 8 shows yet another variant of the mechanical connection of the thermal circuit breaker 75 or the magnetic circuit breaker 73 to the release lever. There, the crash contact point is made directly via the crash pin 373 of the circuit breaker 273 without detour via the crash bar 277 . Here, however, the release of the engagement point via the release lever 240 also takes place with the intermediate connection of the striker lever 277 . Thus, a very fast and immediate opening of the contacts in the event of a short circuit is achieved.

The strike lever 277 has a through hole 285 through which the strike pin 373 of the magnetic circuit breaker 273 protrudes. A circumferential collar 374 is formed on the crash pin 373 in the region between the end face of the magnetic disconnector 273 and the crash lever 277 . If now, in the event of a short-circuit current, the crash pin 373 is accelerated by the armature drive of the magnetic circuit breaker 273 towards the crash bar 277 in the direction of the arrow P1, then the crash pin first strikes with the flange 374 the first part of the crash bar 277 One arm 278, so that the first arm swings clockwise around the fixed axis 276 of the crash bar in the direction of arrow P4, and the second arm 283 of the crash bar counterclockwise in the direction of arrow P5 Swing the release lever 240 freely, so that the engagement point of the switch lock is released.

Then, the bump pin 373 continues to move under the condition of driving the bump lever 277 until it hits the contact rod 262 and bumps the contact rod clockwise into the disconnected position along the direction of the arrow P3.

In the case of thermal cut-off, the movement of the metal strip of the thermal disconnector is transmitted via the drive bracket 280 in the pulling direction of the arrow P2 to the striker lever 277 and likewise converted into a clockwise pivoting of the striker lever. In this case, the striker lever 277 does not have a lug facing the contact lever 262 because, as in the other embodiments described above, this lug is only used to strike the contact lever also by means of the striker lever.

Explanation of reference signs:

10 Line protection switch

11, 111, 211 first shell half shell

12 front front wall

13 rear front wall

14,114 front side wall

17 holes

18 joystick

19 switch knob

20 fixed axis

21 protrusion

22 protrusion

23 storage space

24 eyelets

25 eyelets

26 legs

27 Bows

28, 128 guide extension

29 legs

30 Bow connection

31 bayonet

32 bayonet

33 middle pole

34 protrusion

35 protrusion

36 long holes

37 pawl lever

38 Journal

39 Journal

40, 140, 240 release lever

41 First Arm

42 annular hole

43 Second Arm

44 stop surface

45 Stop Lug

46 spring device

47 spring arm

48 spring arm

49 Lug on detent lever

50 link chain

51 Flange

52 cover

53 inclined plane

54 Keep the cut

55 Intermediate connection

60 holes

61 pins

62, 162, 162a, 262 Contact rod

63 axis

64 first shaft

65 second shaft

66 long holes

67 storage space

68, 168, 168a Movable contacts

69 Contact pressure spring

70, 170, 170a fixed contacts

71 block

72 Coils

73, 173, 273 Magnetic circuit breakers

74 metal strap

75 thermal circuit breaker

76, 176 Axes with fixed positions

77, 177, 277 Collision bar

78,278 First arm

79, 179 holes

80, 280 transfer bow

81 guide groove

82 side walls

83,283 Second arm

84, 184, 284 Lugs

85 Arc extinguishing device

86 wedge-shaped protrusion

87 Support surface

90 stop

92 Collision distance

173,373 Collision pins

120 flange

121 holes

284 holes

285 through holes

290 Second stop

374 Flange

Claims (22)

1. Electrical installation switchgear, especially circuit protection switch, the electrical switchgear includes an electromagnetic circuit breaker with an armature, a thermal circuit breaker, a fixed and a movable contact, a thermal circuit breaker and a magnetic circuit breaker Tripped switch lock comprising an articulation point formed by a release lever and a detent lever which is rotatably mounted in a fixed position and has an elongated hole for guiding the bow, wherein for opening in the event of a short circuit The armature of the contact point can act on the contact lever with movable contact pieces, and the switch lock can permanently keep the contact lever in the disconnected position. The electrical switching device also includes a switch knob and an intermediate lever. The switch knob is used for manual To operate the switch lock, the intermediate rod is hinged at one end to the contact rod, and at the other end to the bow, wherein the bow is hinged to the switch knob with at least one leg, characterized in that the contact rod constitutes A first component that can be prefabricated into the housing in which the switching device is installed, which is pivotally mounted on a rotary shaft fixedly connected to the housing after being installed in the housing, and the switch knob and the release lever , the ratchet lever, the intermediate lever and the bow together form a second assembly which can be prefabricated into the housing and which, after loading, is hingedly connected to the first assembly at the separation point. 2. Electrical installation switching device according to claim 1, characterized in that, in the disconnected position, the movement path of the contact lever can be limited by abutting against a stop which is fixedly connected to the housing. 3. Electrical installation switchgear according to claim 1 or 2, characterized in that the separation point is formed by the connection point between a free end of the intermediate rod and a free end of the contact rod. 4. Electrical installation switchgear according to claim 3, characterized in that the bow has a U shape and comprises a bow connection connecting the two U legs and a formed on the free end of the U legs guide extension. 5. Electrical installation switching device according to claim 4, characterized in that the bracket connection is guided displaceably in an elongated hole of the detent lever. 6. The electrical installation switchgear according to claim 5, characterized in that the switch knob has two fork-shaped projections diametrically opposite the operating handle, the two projections leaving a gap between them. A receiving space that is open on one side is formed, wherein one of the described guide extensions of the bracket is held in each of the two protrusions. 7. Electrical installation switchgear according to claim 6, characterized in that the intermediate rod has a U-profile on its end opposite the separation point, the ends of which are two forked The protrusion, and each of the two forked-arranged protrusions 34 , 35 has a bayonet on the end. 8. Electrical installation switchgear according to claim 7, characterized in that the intermediate lever is hinged to the bow connection by means of the bayonet and surrounds the detent lever with its fork-shaped projection. 9. The electrical installation switchgear as claimed in claim 8, characterized in that the first arm of the release lever engages hingedly with the switch knob in the axis of rotation of the switch knob and is protruded by two forks of the switch knob Ministry surrounded. 10. The electrical installation switching device according to claim 9, characterized in that journals designed as extensions are formed on both sides on the detent lever, by means of which the detent lever is seated on the two housing halves. in the shell. 11. The electrical installation switchgear according to claim 1, characterized in that the switchgear comprises a striker lever which is pivotably arranged in a positionally fixed shaft, through which both the armature and the thermal disconnector act on the release lever . 12. The electrical installation switchgear of claim 11, wherein the striker lever is a double-armed lever. 13. Electrical installation switchgear according to claim 12, characterized in that the armature and the thermal cutout act on the first lever arm of the striker lever and swing the first lever arm during action so that the first lever arm of the striker lever The two lever arms act on the lever arm of the release lever and swing the lever arm, so that the engagement point between the release lever and the ratchet lever is released. 14. Electrical installation switchgear according to claim 11, characterized in that the striker bar (77, 177) is designed to separate along an imaginary plane parallel to the wide face of the housing, so that the magnetic circuit breaker (73) On magnetic cut-off it acts on the first part of the striker bar (177) which is on the inside, while on thermal cut-off it acts on the second part of the striker bar (177) which is on the outside. 15. The electrical installation switchgear according to claim 11, characterized in that the pivoting path of the strike lever (77, 177) can be limited by a second fixed stop (290). 16. Electrical installation switchgear according to claim 13, characterized in that the thermal disconnector is connected to the strike lever by means of a drawer bow, and in the closed position of the contact lever the second arm of the release lever is approximately in contact with The drawer bow extends parallel, while the strike lever is approximately at right angles to the drawer bow and the second arm of the release lever. 17. The electrical installation switchgear of claim 16, wherein the armature strikes the striker rod against the contact rod to rapidly strike the contact point. 18. Electrical installation switchgear according to claim 16, characterized in that the armature, when disconnected, first swings the striker lever onto the release lever and then strikes the contact lever to break the contact point. 19. Electrical installation switchgear according to claim 12, characterized in that the armature acts on the first lever arm of the striker lever and swivels the first lever arm when acting so that the second lever arm of the striker lever acts the lever arm of the release lever and swing the lever arm, so that the joint point between the release lever and the pawl lever is released, and the thermal circuit breaker acts directly on the release lever by pushing the bow to release the joint point , or act on the second lever arm of the crash lever by pushing the bow to make it swing. 20. The electrical installation switching device as claimed in claim 1, characterized in that the subsequent lowering of the contact rod towards the fixed contact piece which occurs when the movable contact piece wears is limited by a fixed stop. 21. Electrical installation switchgear according to claim 18, characterized in that the fixed stop is formed by a housing projection. 22. The electrical installation switching device as claimed in claim 19, characterized in that the contact lever is held in such a position by a fixed stop during the following lowering that the pivoting of the release lever does not occur in the event of release. be hindered by the contact rod.

Images