BG67539B1 - Spring-loaded energy accumulator for power switch of step voltage regulator - Google Patents

Abstract

The load-bearing body of the spring-loaded energy accumulator as per the present invention is composed of an upper carrying element (1), a lower carrying element (2) and several connecting vertical columns (3). The upper carrying element (1) has a ring (4) which is bolted to the circular bottom (6) of the power switch contact system (5). At one end of the case there is a vertically arranged axle (8) with a locking mechanism (9) mounted above said axle (8). Rested on bearings under the locking mechanism (9) are a left lever (19) and a right lever (20) with tails (21) and switching springs (23) stretched between them. Rested on bearings under the levers of axle (8) is a loading arm (24) at the end of which there is an axle (25) which carries a rolling bearing (26). Rested on bearings in the middle of the bottom (8) is a drive shaft (14) with a transverse two-arm lever (15). On one of said arms there is a locking tail (16) which interacts with the locking mechanism (9). Fixed to the other arm is an axle (17) with a second rolling bearing (18) which is identical with bearing (26). The two bearings (18, 26) are accommodated between the inner butts of the two levers (19, 20). The lower carrying element (2) has a bracket (31) which carries a bearing (30) with a loading pulley (29). In the figure the bracket is turned to 90° for the sake of clarity. Mounted on the pulley (29) is an axle (28) with a bearing which carries one of the ends of a loading bar (27). The other end of the bar (27) is connected to the axle (25) of the loading arm (24). In the centre of the pulley (29) there is a profiled hole (32) which is coupled to a known actuator.

Description

(54) SPRING ENERGY ACCUMULATOR FOR VOLTAGE STEP-UP REGULATOR POWER SWITCH

Field of technique

The invention relates to a step regulator that is built into power transformers with on-load voltage regulation. The main unit of the step regulator is the power switch, which is installed in an oil pan. It contains a contact system, a spring energy accumulator and resistors. According to the location in relation to the contact system, there are two options - a spring energy accumulator that is mounted above the contact system and one located below it. In step regulators with star center regulation, there are six pass-through insulators with current-carrying hearts located on the periphery at the bottom of the oil pan. Between them is placed a spring-loaded energy accumulator, which is installed under the contact system. This necessitates the use of a battery with small dimensions.

Prior art

A spring energy accumulator /1/ installed under the contact system of the power switch is known. It contains two tension-operated switching springs. One end of these springs is connected by a cross-member and a pin slide attached to one arm of a two-armed lever mounted on the lower end of a vertical shaft driving the power switch contact system. The other end of the lever is fixed in one of the two end positions by a locking mechanism. Coaxially on the drive shaft, towards the bottom of the contact system, is a bearing drive arm, on the outer end of which the traverse of the other end of the switching springs is caught. The drive arm has a tail which is coupled to an articulated four-link mechanism mounted on the bottom of the oil pan.

A disadvantage of this spring energy accumulator is that it is relatively complex and takes up a lot of space, since the mechanisms rotate within the entire circle. Another drawback is that the charging mechanisms are mounted to the bottom of the oil pan and are difficult to access for inspection and inspection. A disadvantage is that there are sliding elements.

Another spring energy accumulator /2/ is known, which has a more compact design. It contains a support housing to which two parallel support axles are mounted. Two mirror-positioned sleds slide on them on both sides. Attached to the outer ends of the slides are two tension switching springs mounted coaxially on the axles. Between the inner faces of the carriages there are two rolling bearings located one below the other. One of them is mounted on the end of a loading lever, which is connected to a loading rod and an eccentric located on the supporting body. The other rolling bearing is mounted to one arm of a double-arm shifter connected to the drive shaft of the contact system. The other arm is blocked in the end positions by a blocking mechanism.

A disadvantage of this spring energy accumulator is that great precision is required in the manufacture and assembly of the elements in order to limit the friction when sliding the sleds on the axles. Another disadvantage is that rolling bearings are loaded locally during loading and switching, which is not favorable for them. A disadvantage is that it is difficult to replace the springs.

A third spring energy accumulator /3/ is also known, in which all friction pairs are hinged. It contains two axles mounted on a circular flange. On the axles, two levers are mounted on one end, on the other end of which switching springs are mounted. Between the axles, a third axle is mounted on the round flange, on which is mounted a drive lever with a cantilever bearing. Below it on the axis is a bearing locking mechanism consisting of two locking thumbs and a locking spring. In the middle of the circular flange is a bearing drive shaft of the contact system. Attached to the top of this shaft, above the round flange, is a double-arm lever, which also has a cantilevered bearing on one arm. This bearing and the drive lever bearing are located one below the other and are spanned by the faces of two brackets from the two levers. The locking mechanism fixes the second arm of the lever connected to the drive shaft in one of two end positions. The drive lever is connected by a rod to a pulley that makes a 180° rotation in one shift.

A disadvantage of this spring energy accumulator is that it is not suitable for installation under the contact system of the power switch and is therefore used in structures with a location above the contact system. A disadvantage is that it has relatively large overall dimensions.

Technical essence of the invention

The object of the invention is to create a spring energy accumulator for a power switch of a step voltage regulator, which has a simplified construction and reduced overall dimensions, so that it can be installed under the contact system of smaller power switches. At the same time, there should be no sliding pairs and it should be built on the basis of hinged joints.

The task is solved by a spring energy accumulator containing a supporting housing with a locking mechanism installed in it, interacting with a two-armed lever, caught on the lower end of a drive shaft of a contact system of a power switch. There are two more levers, bearing on axles and connected by switching springs. The springs are tensioned by a loading lever with a rolling bearing connected by a loading rod to an eccentric washer. There is also a second rolling bearing, the two bearings being located one below the other between the faces of the two axle-bearing levers.

According to the invention, the supporting body is composed of an upper flat support and a lower flat support connected by a certain number of columns. There are four of them in the example. At one end of the supporting body there is a vertical axis braced between the two supports. Up on the axle next to the upper flat carrier is a bearing locking mechanism with a left locking pin and a right locking pin. On the outside, the thumbs have tails with a compression spring mounted between them. The spring presses the thumbs from the inside against a locking key attached to the upper carrier. Left and right levers are mounted on the axle under the locking mechanism, which at their free end have tails connected to switching springs. At the bottom of the axle, above the lower flat support, is a bearing loading arm with an axle attached to its free end carrying a rolling bearing. The upper flat support has a ring which is connected by screw connections to a metal circular bottom of a contact system of a power switch. In the middle of the bottom is a bearing drive shaft with a two-armed lever attached to it, which on one arm has a tail, which is alternately blocked by the left thumb or the right thumb of the blocking mechanism. On the other arm of the double-linker is a splined axle with a rolling bearing of the same size as the rolling bearing above. The two bearings are located next to each other at different levels between the inner faces of the left lever and the right lever. The axle located at the end of the loading arm is connected by a loading rod to a drive pulley, which is supported on a bracket from the lower flat support. The washer has a profiled central opening which is coupled to a known actuator. The loading rod is caught by a rolling bearing at a certain radius of the drive pulley. On each of the two levers, on the side of the axle on which they are mounted, a plate is attached, designed to release the locking mechanism when the switching springs are fully tensioned.

The advantage of the spring energy accumulator according to the invention is that it has a simple and compact design. It can be installed under the contact systems of various types of power switches, which are built into oil pans with insulated wires passing through the bottom. Another advantage is that there are no sliding joints in the construction, and all connections are hinged with rolling bearings. This provides great mechanical wear resistance. Another advantage is that the shift springs are accessible and easily replaceable.

Explanation of the attached figures

An exemplary embodiment of the spring energy accumulator for a power switch of a step voltage regulator according to the invention is shown in the attached figures, of which:

figure 1 is a longitudinal section (A-A) through the middle of the spring energy accumulator;

figure 2 - cross-section (C-C) under the upper girder;

figure 3 - cross section (D-D) above the two rolling bearings and the loading lever;

figure 4 - longitudinal section (B-B), perpendicular to section A-A.

Examples of implementation of the invention

In the attached figures, the spring energy accumulator is presented in the middle position for easier drawing. It contains a supporting structure of an upper flat support 1 and a lower flat support 2, connected by a certain number of columns 3. The upper support has a connecting ring 4, which by means of screw connections is coupled to a known contact system 5, supported by a circular metal bottom 6 and an insulating cylinder 7. At one end of the supporting structure along the A-A axis, between the two supports 1 and 2, a metal axis 8 is fixed, on which a blocking mechanism consisting of a left blocking thumb 9 and a right blocking thumb 10, which have tails 11, is mounted above. connected to a spring 12 working under pressure. Through it, the two locking thumbs 9 and 10 are pressed against a key 13 attached to the upper carrier 1. A shaft 14 switching the contact system is mounted in the middle of the bottom 6. At its lower end, the shaft 14 has a transverse two-armed lever 15, which has a locking tail 16 on one arm, and an axle 17 with a rolling bearing 18 on the other arm. In both end positions, the tail 16 is blocked by the corresponding thumb 9 or 10. The rolling bearing 18 is located between a left lever 19 and a right lever 20, bearing on an axis 8. At their outer ends, the levers 19 and 20 have tails 21 and 22, between which are mounted one or more switching springs 23, working in tension. The springs 23 have lugs through which they join the tails 21 and 22.

At the lower end of the axis 8, above the lower carrier 2, is a bearing loading arm 24, at the end of which is fixed an axis 25 with a second rolling bearing 26. It is located between the levers 19 and 20 under a bearing 18. Below the axis 25 is a bearing one end of a loading rod 27, which at its other end is connected by a pin 28 to a pulley 29, bearing 30 on a bracket 31 of the lower carrier 2. In the middle of the pulley 29 there is a profile opening 32, which is connected to a known actuator, not shown. A plate 33 with a vertical pin 34 is attached to the left arm 19, and a plate 35 with a vertical pin 36 is attached to the right arm 20.

For greater clarity in fig. 1, the console 31 with the parts mounted on it is rotated by 90°.

The operation of the spring energy accumulator is as follows.

In one end position, the tail 16 is clamped by the left thumb 9. The levers 19 and 20 are rotated clockwise at an angle of about 15°. Pin 28 is at outer dead center and channel 32 is in a perpendicular position. Washer 29 begins to rotate clockwise. The loading rod 27 moves the axis 25 in a counter-clockwise direction and a bearing 26 rotates the left lever 19 in the same direction, while the right lever 20 is held by a bearing 18. The springs 23 are stretched. After rotating the washer 29 by about 160°, the pin 34 presses on the tail 11 of the left lever 19 and it releases the lever 15. A jump change follows under the influence of the bearing 18. The washer 29 reaches the inner dead center. Each time the pulley 29 is turned 180°, one switch is made.

Claims (1)

A spring energy accumulator for a power switch of a step voltage regulator comprising a support housing with a locking mechanism mounted therein, interacting with a two-armed lever engaged on a drive shaft, two levers connected by switching springs, a charging eccentric pulley with a charging rod connected to a charging lever and two rolling bearings located between the two levers one above the other, characterized in that the supporting body is composed of an upper flat support (1) and a lower flat support (2) connected by a certain number of columns (3), in one end of the supporting body between the two supports (1, 2) is a reinforced axis (8) on which a locking mechanism with a left locking thumb (9) and a right locking thumb (10), a left lever (19) and a right a lever (20) connected by switching springs (23), a loading arm (24) with an axle (25) at its end, on which are mounted a loading roller bearing (26) and the end of a loading rod (27), the other end of which is connected with a pulley (29) rotating through 180° during one shift, and on one arm of a two-armed lever (15) from a drive shaft (14) an axle (17) with a second rolling bearing (18) is fixed, as the two rolling the bearings (18, 26) are located next to each other between the inner faces of the left lever (19) and the right lever (20)