CN117810759A - Connecting device for rapidly switching star and triangle connection method of three-phase motor - Google Patents

Abstract

The application discloses a connecting device for quick switch three-phase motor star and triangle method relates to the field that the motor detected, and it includes the terminal box, the wiring groove has been seted up to the bottom of terminal box, be provided with the baffle in the terminal box, the baffle will the wiring groove separates into six unit grooves, six the unit groove is 3 lines 2 and arranges, the unit inslot activity is provided with the conducting strip that is used for the electricity connecting wire, terminal box week side is provided with a plurality of magnetism that are used for adsorbing motor housing and inhale the piece. The circuit that current switching three-phase motor star and triangle connect the method is used to this application electricity, and this application can accomplish the electricity of six electric poles on with three-phase asynchronous motor fast and be connected, and the switching knob in the rethread rotatory switching circuit switches two kinds of wiring power supply of three-phase asynchronous motor, improves three-phase asynchronous motor's detection efficiency.

Description

Connecting device for rapidly switching star and triangle connection method of three-phase motor

Technical Field

The application relates to the field of motor detection, in particular to a connecting device for quickly switching a star connection method and a triangle connection method of a three-phase motor.

Background

In the delivery inspection of the three-phase asynchronous motor after assembly, two connection methods of star connection and triangle connection are needed to supply power, working current and working power are obtained, and whether the three-phase motor can be delivered qualified is judged.

The shell of the three-phase asynchronous motor is made of cast iron or stainless steel, three wiring harnesses in the three-phase asynchronous motor form six wiring terminals, the six wiring terminals are uniformly gathered on a wiring board to supply power, the wiring board structure of the three-phase asynchronous motor is shown in fig. 1, two nuts are connected to the upper ends of six wiring poles in a threaded mode, a switching circuit of the detection device is shown in fig. 2, the three-phase motor star-delta switching switch is sold in a finished switch box in the market, the three-phase motor star-delta switching switch internally comprises components such as a circuit board, a relay, a fuse, a capacitor and the like, M in fig. 2 is the three-phase asynchronous motor to be detected, SB3 is a knob switching switch, six wires of the detection device need to be wound between two nuts on the same wiring pole during inspection, the nuts are screwed, the two nuts are made to be close to each other, the wires are clamped, finally the detection device is started to supply power for the three-phase asynchronous motor, the switching switch SB3 is switched to switch the star-delta switching method, the working current and the working power of the motor under the two wiring states are detected respectively, and whether the three-phase asynchronous motor is qualified or not is judged according to the detected working current and working power data.

In the detection, the action of winding six wires on the power connection column and screwing the nuts needs to consume a large amount of time, the motor detection efficiency is low, and the requirement of high-efficiency detection of a large number of motors cannot be met.

Disclosure of Invention

In order to quickly complete the electric connection with six electric connection posts on the three-phase asynchronous motor, the application provides a connecting device for quickly switching between a star connection method and a triangle connection method of the three-phase motor.

The application provides a connecting device for fast switch over three-phase motor star and triangle method adopts following technical scheme:

the utility model provides a connecting device for quick switch three-phase motor star and triangle method, includes the terminal box, the wiring groove has been seted up to the bottom of terminal box, be provided with the baffle in the terminal box, the baffle will the wiring groove is divided into six unit grooves, six the unit groove is 3 row 2 and is listed as and arrange, the unit inslot activity is provided with the conducting strip that is used for the electric connection wire, the terminal box week side is provided with a plurality of magnetism pieces of inhaling that are used for adsorbing the motor casing; the conductive sheet is slidably arranged in the unit groove along the depth direction of the unit groove, six conductive sleeves are fixed in the junction box and correspond to the unit grooves one by one, the conductive sleeves are positioned at the top of the unit groove, the opening of each conductive sleeve faces the conductive sheet, a conductive column in plug-in fit with the conductive sleeve is fixed on the conductive sheet, and a spring for pushing the conductive column to be far away from the conductive sleeve is fixed in each conductive sleeve; the terminal box comprises a terminal box body, wherein one end of the terminal box body, far away from a conductive column, of the conductive sleeve is electrically connected with a lower conductive clamping block, the lower conductive clamping block is fixed in the terminal box body, an upper conductive clamping block is arranged above the lower conductive clamping block in a lifting manner in the terminal box body, a lifting rod is fixed on the upper conductive clamping block, one end, far away from the upper conductive clamping block, of the lifting rod extends out of the terminal box body, a pressure spring for pushing the upper conductive clamping block to compress the lower conductive clamping block is arranged in the terminal box body, and a jack for facilitating insertion of a wire between the upper conductive clamping block and the lower conductive clamping block is formed in the side wall of the terminal box body; a buffering limiting air bag for preventing the spring from being excessively compressed is fixed at the top of the conductive sleeve; the conductive sleeve is a resistance metal sleeve, the buffering limiting air bag is a telescopic air bag, and iodine blocks are filled in the buffering limiting air bag; the one end outer wall that the spacing gasbag of buffering kept away from the electric conduction post is fixed with the conducting strip, the conducting strip is kept away from the one side of the spacing gasbag of buffering is fixed in the top of electric conduction cover, the conducting strip is close to the one side of the spacing gasbag of buffering is fixed with the heat conduction pole, the heat conduction pole extends to in the spacing gasbag of buffering, the heat conduction pole is located be provided with the heat conduction fin on the one end in the spacing gasbag of buffering.

Through adopting above-mentioned technical scheme, in the use, six conducting strips pass through wire electrical connection check out test set, in the time of examining, with the junction box cover in three asynchronous machine's wiring board department, six conducting strips correspond six electric poles on the wiring board respectively, because three-phase machine's casing material is cast iron or stainless steel, the magnetic attraction piece adsorbs the casing, drive the terminal box simultaneously and be close to the casing, electric pole top conducting strip, electric pole and conducting strip contact conduction, in this application, the terminal box is under the magnetic force effect, cover in wiring board department steadily, simultaneously with six terminal contact conduction, improve three-phase asynchronous machine before leaving the factory efficiency of examining greatly; the spring pushes the conductive column away from the conductive sleeve in an idle state, the conductive sheet is not electrified, and the use safety is improved; in the working state, the magnetic attraction block adsorbs the motor shell to drive the junction box to be close to the motor shell, the spring is compressed, the conductive column is inserted into the conductive sleeve, and the conductive column and the conductive sheet are electrified and are in the working state; in the detection process, the lead on the detection equipment needs to be electrically connected with the conductive sleeve, and the lead is convenient to detach and connect with the junction box through the structural design; in normal detection, the conductive sleeve has small voltage to the ground, and generates little heat, and basically does not exceed 100 ℃; in case of misoperation of workers, the circuit is shorted, the conductive sleeve rapidly heats, the temperature can easily exceed 200 ℃, at the moment, the iodine blocks are heated and gasified, the volume is expanded, and the conductive column is pushed to leave the conductive sleeve under the expansion effect of the buffering limiting air bag, so that the short-circuit protection function is realized.

Preferably, the unit slots of the first row and the unit slots of the third row are symmetrically distributed at both sides of the unit slots of the second row, and the widths of the two unit slots of the second row are smaller than those of the two unit slots of the first row.

Through adopting above-mentioned technical scheme, during the use, insert two electric posts in the middle of six electric posts respectively to two unit slots of second row, four remaining unit slots and inside conducting strip surface area are big, under the condition that does not surpass application scope, four remaining electric posts all can insert four remaining unit slots smoothly and with inside conducting strip conductive contact to improve the suitability of this application.

Preferably, the conductive sheet is provided with a folded edge on the peripheral side thereof for facilitating sliding of the conductive sheet in the unit groove.

By adopting the technical scheme, the folded edge guides the conductive sheet to slide in the unit groove, so that the problem of blocking is avoided.

Preferably, four sides of terminal box week side all are provided with and hold the box, the magnetism inhale the piece set up in hold in the box, the opening part that holds the box is provided with flip.

Through adopting above-mentioned technical scheme, the terminal box is when idle, places in the toolbox to and during operation, place in the mill, the magnetic powder of terminal box week side can be adsorbed, in order to avoid magnetic powder to cause harmful effects to detecting, need clear up the magnetic powder on adsorbing, through opening flip, take out the magnetic attraction piece, adsorb the magnetic powder outside holding the box and will drop, clean simple operation and high-efficient.

Preferably, a handle is arranged at the top of the junction box.

Through adopting above-mentioned technical scheme, the terminal box of being convenient for takes.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the shell of the three-phase asynchronous motor is adsorbed by the magnetic attraction block, the junction box is driven to be stably pressed at the junction plate of the three-phase asynchronous motor, the binding posts on the junction plate are pressed with the conducting strips, the junction box is stably contacted with and electrically conducted, the ground detection efficiency is improved, in addition, in the detection process, workers can liberate both hands, and the production efficiency is further improved;

2. by means of the spring, the conductive column is pushed to leave the conductive sleeve in a non-working state, so that the use safety is improved, and then the buffer limiting air bag is arranged in the spring, so that the service life of the spring is prolonged;

3. by arranging the iodine blocks in the springs, the characteristics of high-temperature gasification and volume collision of the iodine blocks are utilized, and after the buffering limiting air bags expand, the conductive columns are pushed to leave the conductive sleeves, so that short-circuit protection is realized, and the use safety is further improved;

4. after the short-circuit protection is triggered, the conducting strip which cannot be pressed down is checked, so that a fault position where the short circuit occurs can be found out quickly;

5. the application mode is as follows: six wires of a three-phase motor star and triangle connection switching circuit are respectively inserted into six jacks at the periphery of a junction box, are electrically conductive and locked between a lower conductive clamping block and an upper conductive clamping block, and then the junction box is covered on a junction plate of a three-phase asynchronous motor, and a switching knob in the switching circuit is rotated to realize power supply for the two connection methods of the three-phase motor.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a conventional three-phase asynchronous motor wiring board;

FIG. 2 is a circuit diagram of a prior art fast switching three-phase motor star and delta connection;

FIG. 3 is a schematic diagram of the overall structure of a connection device for rapidly switching between star and delta connections of a three-phase motor according to an embodiment of the present application;

fig. 4 is a schematic diagram of a connection device for quickly switching between star and delta connection of a three-phase motor according to an embodiment of the present application, which mainly shows a bottom structure;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 3 (the right half of the center line is shown for ease of reference due to the symmetry of the cross-sectional view);

FIG. 6 is an enlarged view of part B of FIG. 5;

reference numerals: 1. a junction box; 2. a partition plate; 3. a unit cell; 4. a conductive sheet; 5. a magnetic suction block; 6. a conductive sleeve; 7. a conductive post; 8. a spring; 9. buffering and limiting air bags; 10. iodine blocks; 11. a heat conductive sheet; 12. a heat conduction rod; 13. a heat conduction fin; 14. a lower conductive clamp block; 15. an upper conductive clamp block; 16. a lifting rod; 17. a pressure spring; 18. a jack; 19. folding edges; 20. a housing case; 21. a flip cover; 22. a handle.

Detailed Description

The present application is described in further detail below in conjunction with figures 3-6.

The embodiment of the application discloses a connecting device for rapidly switching a star connection and a triangle connection of a three-phase motor.

Referring to fig. 3, a connecting device for rapidly switching three-phase motor star and triangle connection method, including terminal box 1, terminal box 1 is cuboid form, terminal box 1 top is fixed with handle 22, so that take terminal box 1, see fig. 4 and 5, wiring groove has been seted up to the bottom of terminal box 1, integrative baffle 2 that is fixed with in terminal box 1, baffle 2 separates the wiring groove into six unit groove 3, baffle 2 includes 2 diaphragm and 1 longitudinal plate, six unit groove 3 are 3 row 2 and arrange, the unit inslot 3 slides along unit groove 3 depth direction and is connected with conducting strip 4, six conducting strip 4 surfaces are the rectangle, conducting strip 4 four turns on one's side and is formed with the hem 19 that is convenient for conducting strip 4 slides in unit groove 3, the hem 19 of single conducting strip 4 four sides all is perpendicular with conducting strip 4 surfaces. Four sides of terminal box 1 week side are all integrative to be fixed with and hold box 20, the terminal box 1 and hold the material of box 20 and be insulating silica gel, hold the bottom that box 20 is close to terminal box 1, and hold box 20 and lie in its planar central line, the opening part rotation that holds box 20 is connected with flip 21, flip 21 keeps away from its axis of rotation department and is provided with the joint convex body, hold box 20 lateral wall offered with joint convex body complex draw-in groove, have placed magnetism in the box 20 and inhale piece 5, magnetism inhale piece 5 and be magnet.

In use, the six conductive sheets 4 are electrically connected with the detection equipment through wires, when in detection, the junction box 1 is covered at the junction plate of the three-phase asynchronous motor, the six conductive sheets 4 respectively correspond to six electric connection columns on the junction plate, as the shell of the three-phase motor is made of cast iron or stainless steel, the magnetic attraction block 5 adsorbs the shell and drives the junction box 1 to be close to the shell, the electric connection columns are propped against the conductive sheets 4, and the conductive sheets 4 supply power for the electric connection columns; the terminal box 1 is when idle, places in the toolbox to and the during operation is placed in the mill, and the magnetic powder of terminal box 1 week side can be adsorbed, in order to avoid magnetic powder to cause harmful effects to the detection, need clear up the magnetic powder on the absorption, through opening flip 21, take out magnetic attraction piece 5, adsorb the magnetic powder outside holding box 20 and will drop, clean simple operation and high efficiency.

Referring to fig. 4 and 5, six electric connection columns on the wiring board are all 3 rows and 2 columns, but motors of different types are adopted, distances between adjacent electric connection columns are different, in order to achieve universality, in the application, two columns of unit slots 3 are symmetrically distributed, the first row of unit slots 3 and the third row of unit slots 3 are symmetrically distributed on two sides of the second row of unit slots 3, the width of the second row of unit slots 3 is smaller than that of the first row of unit slots 3, during use, two electric connection columns in the middle of the six electric connection columns are respectively inserted into the second row of unit slots 3, the surface areas of the other four unit slots 3 and the internal conducting strips 4 are large, and under the condition that the use range is not exceeded, the other four electric connection columns can be smoothly inserted into the remaining four unit slots 3 and are in conductive contact with the internal conducting strips 4.

Six conductive sleeves 6 are fixed in the junction box 1, the six conductive sleeves 6 are in one-to-one correspondence with the six unit slots 3, the conductive sleeves 6 are fixed at the tops of the unit slots 3, the openings of the conductive sleeves 6 face the conductive sheets 4, conductive columns 7 which are in plug-in fit with the conductive sleeves 6 are fixed on the conductive sheets 4, one ends of the conductive columns 7, which are far away from the conductive sheets 4, are arranged into ball heads, so that the conductive columns 7 can be smoothly inserted into the conductive sleeves 6, and springs 8 used for pushing the conductive columns 7 to be far away from the conductive sleeves 6 are fixed in the conductive sleeves 6.

The spring 8 pushes the conductive column 7 away from the conductive sleeve 6 in an idle state, the conductive sheet 4 is not electrified, and the use safety is improved; under the operating condition, the magnetic attraction block 5 adsorbs the motor shell to drive the junction box 1 to be close to the motor shell, the spring 8 is compressed, and the conductive column 7 is inserted into the conductive sleeve 6.

Referring to fig. 5 and 6, a buffer limit air bag 9 for preventing the spring 8 from being excessively compressed is fixed to the top of the conductive sleeve 6, and the buffer limit air bag 9 is coaxially arranged in the middle of the spring 8. The buffer limiting air bag 9 is made of a telescopic air bag, the buffer limiting air bag 9 is made of a high-temperature-resistant material, the buffer limiting air bag 9 is filled with an iodine block 10, the conductive sleeve 6 is a resistance metal sleeve, the resistance of the conductive sleeve 6 is 0.2 omega-2 omega, specific numerical values are determined according to the resistance of a winding in the motor, low resistance is selected as far as possible, and in normal detection, the conductive sleeve 6 has small ground voltage and low heating, and basically does not exceed 100 ℃; in case of misoperation of workers, the circuit is short-circuited, the conductive sleeve 6 rapidly heats, the temperature can easily exceed 200 ℃, at this time, the iodine block 10 is heated and gasified, the volume is expanded, and the conductive column 7 is pushed to leave the conductive sleeve 6 under the expansion action of the buffering limiting air bag 9, so that the circuit protection function is realized.

In order to improve the sensitivity of short-circuit protection, the outer wall of one end of the buffering spacing gasbag 9, which is far away from the electric conduction column 7, is fixed with a heat conducting sheet 11 through high-temperature-resistant glue, one side of the heat conducting sheet 11, which is far away from the buffering spacing gasbag 9, is fixed at the top of the electric conduction sleeve 6 through high-temperature-resistant glue, one side of the heat conducting sheet 11, which is close to the buffering spacing gasbag 9, is fixed with a heat conducting rod 12, the heat conducting rod 12 extends into the buffering spacing gasbag 9, and one end of the heat conducting rod 12, which is positioned in the buffering spacing gasbag 9, is integrally fixed with a heat conducting fin 13.

The one end of electrically conductive cover 6 that keeps away from conductive post 7 is electrically connected with down conductive clamp splice 14, down conductive clamp splice 14 is fixed in terminal box 1, the lift of terminal box 1 in the top of down conductive clamp splice 14 is provided with conductive clamp splice 15, be fixed with the lifter 16 on the conductive clamp splice 15, the one end that the lifter 16 kept away from conductive clamp splice 15 extends terminal box 1, form the round platform tip of inversion, during the use, the workman holds the tip of lifter 16 and lifts, be provided with in the terminal box 1 and be used for promoting conductive clamp splice 15 compress tightly the pressure spring 17 of conductive clamp splice 14 down, pressure spring 17 cover is located on the lifter 16, set up the jack 18 of being convenient for insert the wire between upward conductive clamp splice 15 and the conductive clamp splice 14 down on the lateral wall of terminal box 1 both sides. When the wire clamping device is used, the insulating layers outside six wires of the detection equipment are stripped, the upper conductive clamping block 15 is lifted up through the lifting rod 16, a gap is formed between the upper conductive clamping block 15 and the lower conductive clamping block 14, the end part of the wire is inserted into the corresponding jack 18, the wire is clamped between the upper conductive clamping block 15 and the lower conductive clamping block 14, the power supply connection of the conductive sleeve 6 is realized, and the junction box 1 and the detection equipment are conveniently electrically connected.

The application mode is as follows: six wires of a three-phase motor star and triangle connection switching circuit are respectively inserted into six jacks 18 at the periphery of the junction box 1, are electrically conductive and locked between the upper conductive clamping block 15 and the lower conductive clamping block 14, the junction box 1 is covered on a wiring board of the three-phase asynchronous motor, a switching knob in the switching circuit is rotated to realize power supply for the two connection methods of the three-phase motor, and finally, other equipment is matched to detect various data of the motor to judge whether the motor is qualified.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (5)

1. A connecting device for rapidly switching between a three-phase motor star and a triangle connection method, which is characterized in that: the wiring groove is formed in the bottom of the wiring box (1), a partition plate (2) is arranged in the wiring box (1), the partition plate (2) divides the wiring groove into six unit grooves (3), the six unit grooves (3) are arranged in 3 rows and 2 columns, a conducting strip (4) used for electrically connecting wires is movably arranged in the unit grooves (3), and a plurality of magnetic attraction blocks (5) used for adsorbing a motor shell are arranged on the periphery of the wiring box (1); the conductive sheet (4) slides along the depth direction of the unit groove (3) and is arranged in the unit groove (3), six conductive sleeves (6) are fixed in the junction box (1), the six conductive sleeves (6) are in one-to-one correspondence with the six unit grooves (3), the conductive sleeves (6) are positioned at the top of the unit groove (3), the opening of the conductive sleeves (6) faces the conductive sheet (4), conductive columns (7) which are in plug-in fit with the conductive sleeves (6) are fixed on the conductive sheet (4), and springs (8) used for pushing the conductive columns (7) to be away from the conductive sleeves (6) are fixed in the conductive sleeves (6); the utility model discloses a wire-bonding wire, including terminal box (1), conducting sleeve (6), conducting post (7), terminal box (1), conducting sleeve (16), terminal box (1) are provided with electrically conductive clamp splice (14) down in keeping away from one end of conducting post (7), electrically conductive clamp splice (14) down, electrically conductive clamp splice (14) down is fixed in terminal box (1), in the top of electrically conductive clamp splice (14) down in terminal box (1) go up and down, be fixed with on electrically conductive clamp splice (15) lifting lever (16), the one end of keeping away from on electrically conductive clamp splice (15) lifting lever (16) extends terminal box (1), be provided with in terminal box (1) and be used for promoting last electrically conductive clamp splice (15) compress tightly pressure spring (17) of electrically conductive clamp splice (14), jack (18) convenient for to insert the wire between last electrically conductive clamp splice (15) and the lower electrically conductive clamp splice (14) are seted up to the terminal box (1) lateral wall. A buffering limit air bag (9) for preventing the spring (8) from being excessively compressed is fixed at the top of the conductive sleeve (6); the conductive sleeve (6) is a resistance metal sleeve, the buffering and limiting air bag (9) is a telescopic air bag, and the buffering and limiting air bag (9) is filled with iodine blocks (10); the utility model discloses a buffering spacing gasbag, including buffering spacing gasbag (9), conducting strip (11) are fixed with on the one end outer wall that electric pole (7) was kept away from to buffering spacing gasbag (9), conducting strip (11) are kept away from one side of buffering spacing gasbag (9) is fixed in the top of electrically conductive cover (6), conducting strip (11) are close to one side of buffering spacing gasbag (9) is fixed with heat conduction pole (12), heat conduction pole (12) extend to in buffering spacing gasbag (9), heat conduction pole (12) are located be provided with heat conduction fin (13) on the one end in buffering spacing gasbag (9).

2. A connection device for fast switching three phase motor star and delta connections according to claim 1, characterized in that: the unit grooves (3) of the first row and the unit grooves (3) of the third row are symmetrically distributed on two sides of the unit grooves (3) of the second row, and the widths of the two unit grooves (3) of the second row are smaller than those of the two unit grooves (3) of the first row.

3. A connection device for fast switching three phase motor star and delta connections according to claim 1, characterized in that: the periphery of the conducting strip (4) is provided with a folded edge (19) which is convenient for the conducting strip (4) to slide in the unit groove (3).

4. A connection device for fast switching three phase motor star and delta connections according to claim 1, characterized in that: four sides of terminal box (1) week side all are provided with and hold box (20), magnetic attraction piece (5) set up in hold box (20), the opening part that holds box (20) is provided with flip (21).

5. A connection device for fast switching three phase motor star and delta connections according to claim 1, characterized in that: a handle (22) is arranged at the top of the junction box (1).