CN2172515Y - Worm-gear double lead screw liquid varistor - Google Patents

Abstract

The utility model provides a worm-gear double lead screw liquid varistor, which belongs to electromechanical equipment for starting motors with high power. The utility model is the improved design of the existing liquid varistor. The moving electrode gearing device of the utility model not only has a motor or a hand-operating speed reducer, but also has a worm-gear and lead screw gearing structure. The utility model is characterized in that three pairs of moving electrodes and stationary electrodes are arrayed in '-'-shaped in a box body; the moving electrodes are fixed on a cross beam; two lead screws are fixedly connected with the cross beam; two screw nuts which are screwed with the lead screws are arranged to support in a bearing seat; a worm-wheel which is connected with the upper steel body of the screw nut shaft is arranged by the same axis of two worms which are meshed with two screw nuts; a worm shaft is fixedly connected with the output shaft of the speed reducer.

Description

Worm-gear double lead screw liquid varistor

The utility model relates to the liquid rheostat that is used for winding-type motor starting, be specially adapted to that starting power is the winding-type motor of 850-3200KW under the full load condition.

Liquid rheostat is widely used in high-power as a kind of known technology, wound motor starting field is to solve its starting problem under the full load fully loaded transportation condition.And the moving electrode mechanical driving device of known liquid rheostat generally adopts chain drive or pull bar transmission dual mode.The defective that chain drive exists is to take up room greatly, and forward and backward switches that lag time is long, and processing safety is poor, is difficult for sealing and causes dust to enter liquid easily having increased the liquid changing number of times, otherwise will reduce the electric property etc. of liquid rheostat.The shortcoming of pull bar transmission is that the straight line that the rotation of rocking arm, connecting rod can not change the electrode pull bar completely into moves, and any point on the pull bar comes down to a circular motion than long radius, and this has just caused moving electrode that displacement is also arranged in the horizontal direction.Increased the resistance of motion between the drive disk assembly, be difficult to realize apart from displacement greatly between dynamic and static electrode.Known liquid rheostat, its three electrodes are the general triangular arranged that adopts in casing, this is had advantages such as compact conformation during less than 500W by actuating motor power, and when being higher than 500KW by actuating motor power, rotor current will be above 550A during starting, thereby require the stroke of electrode in the rheostat to increase, electrode area increases, amount of liquid increases, the impulse current that the short circuited rotor circuit is produced when preventing liquid superheat and proceed-to-send is excessive, and three electrode structures of rounded projections arranged want to enlarge stroke of electrode and electrode diameter causes three moving electrode radial displacements easily, and the increase amount of liquid will make the casing volume that is square enlarge, to enlarge than its width with general equipment such as electrical control cabinet, and be difficult to install.

The utility model purpose is, for overcoming above-mentioned known technology defective, provide a kind of worm gear pairs transmission two screw type liquid rheostats, make every effort to improvement design by the moving electrode mechanical driving device, make this liquid rheostat satisfy the above power of 500W, the requirement of coiling electric motor starting, guarantee stable drive, reliable, accurate (making moving electrode not have additional displacement), further be the power that reduces drive motors, be easy to realize the sealing of fluid box, so make that this liquid resistance utensil has that life cycle is long, operation, maintenance, equal characteristics easily.

The technical scheme that adopts that achieves the above object is: the two screw type liquid rheostats of this worm gear pairs transmission, comprise the casing that is loaded with resistor fluid liquid, the casing internal fixation has the insulating cylinder of three circulation liquid, be fixed with stationary electrode respectively in the tube, and corresponding with it three moving electrodes that are provided with, quiet, moving electrode forms three equivalences and variable resistor that can the equivalent liquid that changes in the insulating cylinder of liquid is housed, be used for changing moving, relative distance between stationary electrode and realize becoming the mechanical driving device of resistance, but this device includes the reductor by the driving motor manual actuation, it is characterized in that: moving in the insulating cylinder of said three circulation liquid and the tube, stationary electrode is yi word pattern and arranges in casing; Three moving electrodes are fixed on the crossbeam by pull bar separately; Be positioned at center pull rod two ends symmetry on the crossbeam and be connected with two rhizoid thick sticks, two leading screws are outstanding holds separately that screw thread is combined with nut axis, two nut axis rolling bearing what respectively are fixed in the bearing pedestal above the casing, also axis hole setting-in and key steel body are connected with worm gear to two nut axis axle heads separately, respectively with the coaxial formation worm shaft that is provided with of two worm screws of two worm gears engagements, worm shaft by on the axle bed supporting what casing and one axle head and speed reducer output shaft be connected.

Fig. 1 is the two screw type liquid rheostat organigrams of this worm gear pairs transmission.

Fig. 2 is the vertical view of Fig. 1.

The embodiment that provides below in conjunction with accompanying drawing further describes.As shown in the figure, this liquid rheostat includes casing (1), is loaded with the liquid (2) as resistor fluid in the casing (1), and liquid (2) generally selects for use certain density aqueous sodium carbonate as resistance liquid.Casing (1) internal fixation has the insulating cylinder (3) with plastic production of three circulation liquid, and three insulating cylinders (3) bottom all has liquid-through hole (4) and circulates in order to liquid.Three insulating cylinders (3) bottom all is fixed with stationary electrode (5), corresponding three moving electrodes (6) that are provided with three stationary electrodes (5), be fixed with pull bar (7) on each moving electrode (6) respectively, three stationary electrodes (5) all are electrically connected on three lead terminals (9) that are fixed on above the casing (1) respectively by lead-in wire (8), by lead terminal (9) three variable resistors that form in this liquid rheostat are serially connected in by in the rotor loop of three phases of actuating motor during work.The above is the essential structure of liquid rheostat, and its aufbauprinciple, operation principle, electrical connection etc. are public technology category, no longer describes in detail.

This liquid rheostat technical characterstic is the improvement design to the moving electrode mechanical driving device.This mechanical driving device includes driving motor (10), reductor (11) with this motor (10) output shaft mechanical connection, reductor (11) one side shaft ends are equipped with the empty axle of clutch (12), and handwheel (13) is to realize hand, electronic switching and manual operation, this part also belongs to the conventional mechanical design, and wherein reductor (11) can be selected worm reduction gear for use.This mechanical driving device that improves after designing realizes that purpose adopts one of technological means, be that said three insulating cylinder (3) and the dynamic and static electrodes in the tube of circulating liquid are the arrangement of " one " font in casing (1), and the uniform crossbeam (14) that is fixedly connected on of three pull bars (7) that is connected in respectively on three moving electrodes (6) is gone up so that be the connection of steel body between three moving electrodes (6).The employing technological means that achieves the goal also is included in and has adopted worm gear pairs transmission and mariages thick stick drive structure form in the moving electrode mechanical driving device, promptly on crossbeam (14), be positioned at center pull rod (7) two ends symmetry and be connected with two leading screws (15), two leading screws are outstanding holds separately that screw thread is combined with nut axis (16), two nut axis (16) are fixed in the top bearing pedestal (18) of casing (1) by bearing (17) rolling bearing what respectively, two nut axis (16) axle head also separately the axle, hole setting-in and be connected with worm gear (20) by key (19) steel body, constitute worm shaft (21) with coaxial setting of two worm screws of two worm gears (20) engagement respectively, worm shaft (21) supports on the what casing (1) and one axle head and reductor (11) output shaft fixed connection by axle bed (22).Coaxial steel body connected after wherein worm shaft (21) can be made two worm screws as shown in Figure 2.Also be fixed with oil storing tube (23) in the casing (1), and oil storing tube is built-in with lubricating oil (24) and is used for the lubricated of screw mandrel (15).

The course of work of this moving electrode mechanical driving device is: ［ the empty axle of clutch this moment (12) is in electronic position when driving motor (10) rotates, handwheel (13) is thrown off ］, through reductor (11) deceleration worm shaft (21) is rotated, driving worm gear (20) rotates, nut axis (16) is rotated, can not move axially and to rotate because of nut axis (16) is subjected to bearing (17) axial limiting, then making screw thread screw leading screw (15) on it makes up or down (during the motor counter-rotating) straight line relative to it and moves, driving moving electrode (6) moves up or down, change moving, the static anode-cathode distance, make liquid height variation between the two poles of the earth, thereby change its resistance, to realize by the starting electrical control of actuating motor.

The worm gear pairs transmission double lead-screw formula liquid rheostat that the utility model provides has as follows Advantage: because adopting " one " word crossbeam, electrode " word " is arranged, and crossbeam adopts double lead-screw transmission and worm gear pairs transmission, can guarantee reliably the suitable speed of equilibrium of three electrodes, and steadily mobile, the transmission resistance is little, and drive power required is littler. The casing width that forms also can match with general electrical control equipment. This liquid rheostat stroke can reach 450MM, and electrode diameter can reach 320MM, and amount of liquid can increase more than 3 times by relatively known rheostat in the casing, thereby applicable to the starting of 850～3200KW heavy-duty motor. This structure liquid rheostat box sealing is thorough, can prolong liquid changing cycle and whole rheostatic service life, also has easy to operate, reliable, safe advantage.

Claims (1)

1, the two screw type liquid rheostats of a kind of worm gear pairs transmission, comprise the casing that is loaded with resistor fluid liquid, the casing internal fixation has the insulating cylinder of three circulation liquid, be fixed with stationary electrode respectively in the tube, and corresponding with it three moving electrodes that are provided with, quiet, moving electrode forms three equivalences and can the equivalent liquid variable resistor that changes in the insulating cylinder of liquid is housed, be used for changing moving, relative distance between stationary electrode and realize becoming the mechanical driving device of resistance, this device includes the reductor by driving motor or manual actuation, it is characterized in that: moving in the insulating cylinder of said three circulation liquid and the tube, stationary electrode is " word " type and arranges at casing; Three moving electrodes are cemented on the crossbeam by pull bar separately; Be positioned at center pull rod two ends symmetry on the crossbeam and be connected with two rhizoid thick sticks, two leading screws are outstanding holds separately that screw thread is combined with nut axis, two nut axis rolling bearing what respectively are fixed in the bearing pedestal above the casing, also axis hole setting-in and key steel body are connected with worm gear to two nut axis axle heads separately, respectively with the coaxial formation worm shaft that is provided with of two worm screws of two worm gears engagements, worm shaft by on the axle bed supporting what casing and one axle head and speed reducer output shaft be connected.

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