CN101253589B - Switch with case accessory matching with varying pole center distance - Google Patents

Abstract

In order to provide a switch (1) for disconnecting a polyphase alternating current in the medium voltage range, said switch (1) has the same number of pole units (10) as the phases of said alternating current, said pole units being respectively There is a switching tube arranged on a support (11) made of insulating material, the switching tube has switching contacts movable relative to each other, said switching contacts are shared with all pole units (10) by means of a lever mechanism The drivers are connected, wherein the pole units (10) are arranged side by side, and the driver is arranged in a driver housing (2), the front of the driver housing (2) faces away from the pole unit (10), In order for the switch to be able to cost-effectively cover the drive even when the distance between pole centers changes, the invention proposes that the drive housing (2) is extended to the front of the switch by means of an additional cover (12), and that the additional cover A plate (12) is fixed on said drive housing (2).

Description

Switches with housing attachments that match the housing to varying pole center spacing

technical field

The invention relates to a switch for disconnecting a polyphase alternating current in the medium voltage range, said switch having the same number of pole units as there are phases of said alternating current, said pole units each having a pole unit arranged in an insulating material The switching tube on the formed support has switching contacts movable relative to each other, which are connected via a lever mechanism to a drive common to all pole units. Wherein, the pole units are arranged side by side, and the driver is arranged in a driver housing, and the front of the driver housing faces away from the pole units.

Background technique

The known prior art already discloses such switches. Existing switches generally have three switching poles, which are each provided for disconnecting a phase of the alternating current. For this purpose, for example, the switching poles have a common carrier made of insulating material for accommodating switching tubes which each extend in the longitudinal direction between the input connection and the output connection. The input and output interfaces are connected to conductive busbars or output cables. The current flow from the bus bar to the output cable can be stopped by opening the contact of the switch tube.

Existing switches also have a metal support structure for securing the bracket. In this case, the support structure advantageously has a support wall extending substantially planarly. The switching poles are fastened to one side of the supporting wall, a drive common to all switching poles being arranged on the side facing away from the switching poles. The switching movement generated by the drive is usually transmitted to the switching poles via a drive shaft common to all switching poles. For reasons of aesthetics and safety, the shared drive is arranged in a housing-shaped drive housing, which is made, for example, of an inexpensive plastic.

This type of switch is widely applicable to different requirements. Compared with switches with lower operating voltages, the distance between the switch poles arranged next to one another needs to be increased in order to be able to switch properly at high electrical powers, especially at high voltages. In this way, undesired mutual influences between the individual switching poles are avoided. The distance between the poles of a switch is often referred to as the center-to-pole spacing of the switch.

The actuator of the switch and in particular the switch housing should generally be adapted to different pole center distances. This is usually achieved through a larger volumetric design of the entire switch. In contrast, it is also possible only to lengthen the drive shaft, while the switch housing retains its dimensions. However, when using this method, the drive unit is not completely covered by the drive housing, thus causing unacceptable problems for customers. On the other hand, enlarging the drive housing, especially the drive, to match the larger pole center spacing is costly.

Contents of the invention

The problem underlying the invention is to provide a switch of the type mentioned at the outset, by means of which the drive can be cost-effectively covered when the distance between pole centers changes.

The invention solves this technical problem in that the drive housing is extended by means of an additional cover and the additional cover is fastened to the drive housing.

The invention extends the actuator housing of the switch with an additional cover that can be produced inexpensively. In this way it is possible to use a large number of common components and structural components in a series of switches with different pole center distances. According to the invention, the consideration of pole center distances of different sizes results in only a slight increase in the number of required structural parts, so that the manufacturing costs of the switch can be significantly reduced. An additional cover covers the extended drive unit, thereby increasing the safety of the switch and reducing the risk of contamination of the drive unit.

According to the invention, the switch front is expanded cost-effectively. In this case, the additional cover is formed, for example, from a suitable plastic which has the necessary strength so that a simple fastening of the additional cover to the drive housing automatically, that is, without additional mounting reinforcements is possible. Next, the shielding function for the driving device is realized. According to the invention, the front of the drive housing is extended by the additional cover to form a common switch front. The common switching front has the same width as the adjacently arranged pole units.

It is advantageous if the driver housing is arranged centrally with respect to the pole unit, wherein the additional cover has two side covers of the same size, which are each arranged on one side of the driver housing. In this way, the additional cover can be designed to have an almost identical shape and be connected to the drive housing on both sides. For this purpose, the additional cover has, for example, suitable fastening holes. Viewed from the front, this further development of the switch has a symmetrical construction on the front.

The additional cover panels advantageously each have a flat front surface which can be aligned with one another. In this way the symmetry of the front of the switch is increased.

The drive housing advantageously has an openable low-voltage terminal box. According to an advantageous further development, the low-voltage connections converge at one point on the driver housing and are locked by a foldable low-voltage cover. Additional covers can be designed as cable-free trays or similar.

The additional cover is advantageously made of a non-deformable plastic. The non-deformable plastic is, for example, a correspondingly high-strength thermoplastic in order to be able to perform the shielding effect without reinforcing means. However, non-deformable plastic materials are not limited to thermoplastics. For example, fiber-reinforced plastics having a sufficiently high mechanical strength can therefore be used within the framework of the invention.

The additional cover can advantageously be screwed to the drive housing. The screwing of the additional cover to the drive housing results in a particularly simple and mainly detachable fastening, which further reduces costs.

The additional cover can advantageously be designed in the shape of a hood. Such a cap-shaped additional cover has, for example, a thin-walled front wall part which is substantially surrounded by a beaded edge part. The edge part extends, for example, perpendicularly to the wall part and serves on the one hand to fasten the additional cover to the drive housing or to a mounting system for mounting the drive housing and the additional cover. on the common floor, and on the other hand to cover the drives at the sides. In order to provide the necessary inflexibility or mechanical strength, the additional cover according to the invention has, for example, reinforcing ribs.

Advantageously, a grounded metal support frame is provided, wherein the support frame has a support wall extending between the pole unit and the drive, to which the pole unit and the drive housing are fastened. The supporting wall proves to be a fastening structure which can be produced cost-effectively for switches for which the respective pole-center distances have been specified beforehand. The drive with drive housing and the additional cover are fastened on one side of the support wall, while the pole unit is fastened on the other side of the support wall.

Description of drawings

Further expedient refinements and advantages of the invention are the subject matter of the following description with reference to the embodiments of the invention shown in the drawings, in which functionally identical components are provided with the same reference numerals, wherein:

Fig. 1 is the front view of the implementation form of the switch with the smallest center-to-pole spacing according to the present invention;

Fig. 2 shows that the switch as in Fig. 1 is designed to have a medium pole center spacing;

Fig. 3 shows a switch as in Fig. 1 designed to have a maximum pole center spacing.

Detailed ways

FIG. 1 shows a front view of an embodiment of a switch 1 according to the invention. The switch 1 has a switch housing 2 made of a suitable plastic. The switch housing 2 is designed in the shape of a housing and partially surrounds the driver arranged therein. Here, the drive is suspended on a support wall 3 of a support frame, which is fixedly connected to a base plate 4 of the support frame. An openable low-voltage terminal box 5 and a plug 6 are arranged in the upper region of the driver housing, wherein the electrical connections for the electronic components of the switch 1 come together.

Furthermore, a display area of the switch 1 can be seen, in which a keyboard 8 and display elements 9 can be seen, as well as an operating area 7 which can trigger an energy store or display characteristic parameters, for example. On the side of the supporting wall 3 facing away from the driver housing 2 three switching poles 10 arranged next to one another in a plane and having a carrier 11 made of mechanically stable and electrically insulating plastic can be seen.

An input connector for connecting the bus bar, an output connector for connecting the output cable, and a vacuum switch tube extending between the input connector and the output connector are fixed on the bracket 11 . The switch tube has a fixed contact with a fixed position and a movable contact that moves longitudinally relative to the fixed contact. The moving contact is fixed on a free end of the switch rod, and the switch rod protrudes from the housing of the vacuum interrupter airtightly, and is connected with the driver arranged in the driver housing 2 through a pot-shaped insulator. The vacuum interrupter is mounted in the bracket 11 in such a way that the switching lever faces the base part 4 .

FIG. 2 shows a switch as in FIG. 1 , wherein the spacing between the pole units is relatively larger compared to the switch 1 shown in FIG. 1 . In other words, the switch 1 shown in FIG. 2 has a larger pole center distance than the switch shown in FIG. 1 . The increased pole center distance places demands on the individual components of the switch 1 that a larger frame with wider support walls 3 and base plate 4 is required. Furthermore, the drive shaft extending transversely, ie parallel to the base plate 4 and arranged in the driver housing 2 needs to be extended relative to the drive shaft of the switch in FIG. 1 . The driver housing 2 and the driver of the switch shown in Fig. 1 and Fig. 2 are made of almost identical structural parts. It is just that the length of the drive shaft is adapted to the respective pole center distance. In order to cover part of the widened mechanical structure to prevent contamination and dirt when the pole center distance is enlarged, additional cover plates 12 are provided on both sides of the drive housing 2, and the additional cover plates 12 are for example connected to the drive respectively The shell 2 and the bottom plate 4 are screwed on. The length of these additional covers 12 is adapted to the height of the drive housing 2 including the low-voltage terminal box 5 .

FIG. 3 shows a switch 1 as in FIG. 2 with a larger pole center distance. Here too, the dimensions of the support plate 3 and the base plate 4 are adapted to the increased spacing between the switching poles 10 . The driver housing 2 and other parts of the driver except the switch shaft are the same as the corresponding parts in the switches shown in FIGS. 2 and 1 . However, the width of the additional cover 12 is greater than that of FIG. 2 , and this width is adapted to the selected pole-center distance, so that the mechanical structure of the drive is completely hidden. Here, the additional cover 12 is designed here in the form of a hood or a half-shell, the additional cover 12 together with the side walls not shown in FIGS. The shown front wall area extends to the support plate 3 on the rear side.

Claims (8)

1. switch (1) that is used for disconnecting the many phase alternating current in the pressure scope, this switch (1) has the quantity pole unit (10) identical with the number of phases of described alternating current, described pole unit (10) has a switching tube that is fixed on the support of being made by insulating material (11) respectively, this switching tube has the switch contact that can move relative to each other, described switch contact links to each other by a total driver of a leverage and all pole units (10), wherein, described each pole unit (10) is provided with abreast, described driver is arranged in the drive enclosure (2) of a described dorsad pole unit in its front (10), it is characterized in that, described drive enclosure (2) is expanded by means of extra flap (12), and described extra flap (12) is fixed on the described drive enclosure (2).

2. switch according to claim 1 (1),

It is characterized in that, in the middle of described drive enclosure (2) is arranged on respect to described pole unit (10), wherein, described extra flap (12) comprises two onesize side cover plates (12), and described side cover plate (12) is separately positioned on a side of described drive enclosure (2).

3. switch according to claim 1 and 2 (1),

It is characterized in that described each extra flap (12) has a smooth front surface of alignment setting mutually respectively.

4. switch according to claim 1 and 2 (1),

It is characterized in that described drive enclosure (2) has the low pressure terminal box (5) that can open.

5. switch according to claim 1 and 2 (1),

It is characterized in that described extra flap (12) is made of a kind of on-deformable plastics.

6. switch according to claim 1 and 2 (1),

It is characterized in that described extra flap (12) is tightened with described drive enclosure (2).

7. switch according to claim 1 and 2 (1),

It is characterized in that described extra flap is designed to case shape.

8. switch according to claim 1 and 2 (1),

It is characterized in that, be provided with the metal supporting frames (3,4) of a ground connection, wherein, this bracing frame has a supporting walls (3) that extends between described pole unit (10) and driver, described pole unit (10) and described drive enclosure (2) are fixed on this supporting walls (3).

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