BG66468B1 - Device for short switching of the polar resistors of a step regulator with preselector - Google Patents

Abstract

In individual cases, when switching-over the preselector of a step regulator, it is necessary to use polar resistors (4). Most often they are mounted in an insulating cylinder (3) and located under the selector (1). In most cases, the polar resistors are permanently switched and that is why, their number is significantly growing. Loading of the polar resistors and their number is significantly reduced if they operate only during switching-over the preselector. For this purpose, a device for short switching is used, which is detached in a separate unit (5) and is located below the bottom plate (6) of the preselector. In this way, the structures and the overall dimensions of the selector (1), the preselector (2) and the unit of the polar resistors (4) will not change. There are two versions of the drive mechanism. In the first one, a two-position Maltese gear (18-21) is used, combined with accelerating gear (15-16). To the shaft (20) of the Maltese sector (21), a three-rayed star (22) is fixed, to which contact plates (23) of a movable contact system are mounted. The immovable contact elements (8) are fitted on the insulating cylinder (3) and two insulators (25) are connected to the upper bearing plank (13). Upon rotating the mobile system (9) of the preselector (2), the mechanism will provide contacting to the first step of the Maltese gear and opening in the second step. The second version of the mechanism makes use of a combination of the accelerating gear (15-16) and a cam mechanism.

Description

(54) DEVICE FOR SHORT-TIME SWITCHING ON OF POLE RESISTORS ON A STEP CONTROLLER WITH PRESELECTOR

Field of technology

The invention relates to a step voltage regulator with a preselector and pole resistors, when it is necessary to turn on the pole resistors briefly only during the reversal of the preselector.

BACKGROUND OF THE INVENTION

A device for short-term switching of pole resistors / 1 / is known, built into a preselector and containing a Maltese gear with two fixed positions and fixed and movable contact elements mounted on additional insulating rails of the preselector.

The disadvantage of this device is that it complicates the design of the pre-selector and significantly increases its dimensions. Another disadvantage is that there is no unification with the mass-produced pre-voters. It is also difficult to connect the fixed contact elements of the device with the pole resistors, which are connected as a separate node under the selected.

There is also a device for short-term switching of pole resistors / 2 /, located in the insulating cylinder of the pole resistors above them and below the selected one. In this case, a cam mechanism is used, which is actuated by an elongated drive shaft of the selected.

The disadvantage of this device is that it changes the design of the selected and the node of the pole resistors, which increase in height. Another disadvantage is that the cam mechanism has deteriorated geometric parameters.

Technical essence of the invention

The object of the invention is to provide a device for short-term switching of the pole resistors, which is separated as a separate unit and does not change the design and overall dimensions of the selected, pre-selector and node of the pole resistors. It can also be applied in different sizes of elected and pre-elected.

The problem is solved with a device for short-term switching of the pole resistors, comprising a mechanism for actuating movable contact elements, which are periodically connected or removed from fixed contact elements located on the insulating cylinder of the pole resistors. According to the invention, the device is designed as a separate unit mounted under the lower support plate of the pre-selector and is connected to it by a coupling at the lower bearing of the movable insulating rail of the pre-selector, which activates its movable contact units. The short-term contact mechanism consists of an accelerating gear from a large gear sector and a small gear, to the shaft of which a double Maltese gear is connected. A shaft of the two-position Maltese sector is mounted against the shaft of the dental sector. At the lower end of this shaft, movable contact assemblies are mounted at 120 ° to each other. One fixed contact element is mounted to the insulating cylinder of the pole resistors, and the other two fixed contact elements are attached to insulators connected to the upper support plate of the unit. The connection between the two fixed contact elements on the insulators and the fixed contact elements on the insulating cylinder of the pole resistors is made by wires.

In another variant, the mechanism performing the short-term engagement consists of an accelerating gear, and a disk with a profile cam channel on its periphery is mounted to the shaft of the small gear. A bracket is attached to the lower plate of the unit, on which a two-arm lever is mounted. A roller is mounted on the short arm of the lever, which enters the hump channel. On the long arm are located three movable contact elements, which periodically contact three fixed contact elements attached to the insulating cylinder of the pole resistors.

The advantage of the device for short-term connection of pole resistors of a step regulator according to the invention is that the device is separate as a stand-alone

66468 Bl assembly mounted under the lower plate of the pre-selector. In this case, the constructions and overall dimensions of the selector, pre-selector and pole resistors do not change. Another advantage is that the same device can be used for different sizes of selectors, preselectors and pole resistors.

Explanation of the attached figures

An exemplary embodiment of the device for 1θ short-term switching of pole resistors of a step regulator with a preselector, according to the invention, is shown in the attached figures, of which:

Figure 1 is a longitudinal section through a $ 1 selector with a preselector and pole resistors with a device mounted below the preselector;

figure 2 - cross section through the pre-selector;

figure 3 - cross section through the node of the ² θ pole resistors and the device;

Figure 4 is a diagram of the operation of the device and the preselector;

Figure 5 is a longitudinal section through the device for short-term engagement in 25 variant with a Maltese gear;

Figure 6 is a cross-sectional view through the accelerating gear of the device of Figure 1; 5;

Figure 7 is a cross-sectional view through the Maltese gear of the device of Figure 30; 5;

FIG. 8 is a cross-sectional view through the movable and immovable contact elements of the device of FIG. 5;

Figure 9 is a longitudinal section through a device $ $ for short-term inclusion in a variant with a hump mechanism;

Figure 10 is a cross-section through the hump mechanism of Figure 1; 9;

Figure 11 is an unfolded profile of the hump 40 channel.

Examples of the invention

Known selector 1 (Fig. 1) has a laterally located preselector 2 and mounted below the selector insulating cylinder 3 with pole resistors 4. The short-circuit device 5 is separated as a separate unit and is attached to the lower plate 6 of the preselector 2. It has movable contact elements 7, which contact the fixed contact elements 8 located on the insulating cylinder 3 only during the movement of the drive insulating rail 9 of the pre-selector 2, which carries the movable contact units 10 (Fig. 2). They are in some way in contact with the fixed contact elements 11 of the preselector. The input shaft 12 of the device 5 is coupled to the lower end of the drive rail 9. In FIG. 3 shows a cross section through the node of the pole resistors 4 at a three-phase step regulator (phase, y, ζ). With a single-phase or two-phase selector, the number of movable contact elements 7 and the corresponding fixed contact elements becomes one or two. In FIG. 4 shows the sequence of operation of the pre-selector and the mechanism of short-term switching. The angle alpha corresponds to the rotation of the movable contact node 10 from start to stop (Fig. 2), the angle alpha1 - from the separation of the movable contact node 10 from one fixed contact element 11 to contact with the other fixed contact element and the angle alpha2 - included subwoofers included elements 7 to fixed 8 of the short-circuit device.

A mechanism using a Maltese gear is shown in Figures 5, 6, 7 and 8. The assembly of the device 5 is composed of an upper support plate 13 and a lower support plate 14, between which the mechanism is located. A large gear sector 15 is connected to the shaft 12, which engages with a small gear wheel 16. On the shaft 17 of the small gear wheel 15 is mounted a double Maltese gear 18 with two rollers 19. A shaft 20 with a two-position Maltese sector 21 At the lower end of the shaft 20 there is a three-spoke star 22, which carries the movable contact plates 23 with contact springs 24. One movable contact element 8 is attached to the insulating cylinder 3 of the pole resistors 4, and the other two are located (Fig. 8). insulators 25 attached to the upper plate 13 of the node. Figures 6, 7 and 8 show the contour of the lower plate 6 of the preselector with a dotted line. On the insulating cylinder 3 are mounted the other two fixed contact elements 26, which are connected by wires l

66468 Bl to the contact elements 8 on the insulators 25.

The operation of the Maltese gear mechanism is as follows. The shaft 12 with the tooth sector 15 rotates at an alpha angle. The small gear 16 rotates at a significantly larger angle (eg Zalfa). The aim is for the Maltese sector 21 to have a sufficient stroke to switch on the contact elements 23 to 8 in the first step and to switch them off in the second step (Fig. 8). This is ensured - alpha2> alpha1 (Fig. 4). Without the accelerating gear, structural changes will be required in the pre-selector.

A mechanism using a cam transmission is shown in FIG. 9 and FIG. 10. The known elements have the same numbers. A disk 28 with a cam channel 29 on the periphery is mounted to the shaft 17 of the small gear 16. The disk 28 is shown with a dotted line in order to see the elements behind it. A two-arm lever 32 is mounted on an axis 31 attached to the lower plate 17 of the assembly. On the short arm of the lever there is a roller 33 which enters the cam channel 29. On the long arm of the lever 32 three movable contact plates 23 are mounted. with contact springs 24. The three fixed contact elements 8 are attached to the insulating cylinder 3. In the stationary position (Fig. 9) the roller 33 is in the upper part of the cam channel 29 and the contact units are open. When closing a small corner of the disk 28, the contact nodes (the dotted line) are switched on. In the end position, the roller 33 goes again to the upper end of the cam channel 29 and the contact nodes are open. The accelerating gear 15-16 provides a favorable geometry of the cam channel 29.

The action of the mechanism is also achieved if the disk 28 has a front cam profile, but then the lever 32 must be held in the open position by an additional spring.

Claims (4)

Device for short-term connection of pole resistors of a step regulator with a preselector, comprising a drive mechanism and fixed and movable contact elements, characterized in that it is formed as a separate unit (5), in which a mechanism for making periodic contacting is built-in of the movable contact elements (7) of the unit (5) to the fixed contact elements (8) located on an insulating cylinder (3) bearing pole resistors (4), the unit (5) being mounted under the lower bearing plate (6) of the the preselector (2) and is connected to it by a coupling (12) at the lower bearing of the movable insulating rail (9) for driving the movable contact units (10) of the preselector (2). Device for short-term connection of pole resistors according to claim 1, characterized in that the mechanism for short-term contact consists of an accelerating gear from a large gear sector (15) connected to a small gear (16) to the shaft (17) to which a double Maltese gear (18) is connected, and coaxially to the shaft (12) of the dental sector (15) is a bearing shaft (20) of a two-position Maltese sector (21), as to the lower end of the shaft (20) are mounted at 120 ° relative to each other movable contact units (23), and three fixed contact elements (26) are attached to insulators (25) connected to the upper support plate (13) of the unit (5). Device for short-term switching of pole resistors according to claims 1 and 2, characterized in that one fixed contact element (8) is mounted to the insulating cylinder (3) of the pole resistors (4) and the other two contact elements ) are attached to insulators (25) connected to the upper support plate (13) of the unit (5), as the connection between the two fixed contact elements (8) and the two fixed contact elements (26) located on the insulating cylinder (3) is carried out by wires (27). Device for short-term switching of pole resistors according to claim 1, characterized in that the mechanism for carrying out the short-term switching consists of an accelerating gear (15-16), as to the shaft (17) of the small gear (16) a disk (28) with a profiled cam channel (29) is mounted on its periphery, and a carrier (30) is attached to the lower plate (14) of the shaft (5), on which a two-arm lever (32) with a roller (33) is mounted. , entering the profile channel (29) to the short arm and with three movable contact elements (23) - to 66468 Bl long arm, periodically contacting is three fixed contact elements (8), attached to the insulating cylinder (3) of the pole resistors (4).