Low-voltage permanent magnet vacuum feed switch

Abstract

The invention relates to the field of feed switches, in particular to a low-voltage permanent magnet vacuum feed switch. The circuit breaker comprises a housing, a circuit breaker core module and a position adjusting mechanism. The two sides of the upper portion of the shell are communicated with two first power cable leading-in devices and two second power cable leading-in devices respectively, an inlet wire binding post and an outlet wire binding post are arranged in the shell, the inlet wire binding post is electrically connected with an input conductive bus, the input conductive bus is electrically connected with an input connector, the outlet wire binding post is electrically connected with an output conductive bus, and the input connector is electrically connected with an output connector. The output conductive bus is electrically connected with an output connector; the circuit breaker movement module comprises an input contact piece and an output contact piece, the input contact piece faces the input connector, and the output contact piece faces the output connector. According to the invention, electric propulsion and electric pull-out of the circuit breaker core module can be carried out, operation of an underground feed switch can be remotely controlled on the ground, remote debugging and remote maintenance of mine equipment are realized, and an unattended function of a mine is realized.

Description

Technical Field

[0001] The present invention relates to the field of feed switches, in particular to a low-voltage permanent magnet vacuum feed switch. Background Art

[0002] Feeder switches feature a complete flameproof housing and can be used directly in underground coal mine power supply systems. They are available in two types: vacuum-type and air-type. In mines containing explosive gases and coal dust, feeder switches are required as main or branch switches. They can also be used to control the infrequent starting of large-capacity motors.

[0003] For existing conventional feeder switches, when power is cut off, power is supplied, or the movement is inspected, maintenance personnel must be sent to the underground site to manually cut off the power supply, manually disassemble the movement, and manually inspect the equipment movement, which is very inconvenient and has low safety. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the background technology and propose a low-voltage permanent magnet vacuum feeder switch, which can electrically advance and electrically pull out the circuit breaker core module, and can use the ground remote control to operate the underground feeder switch, thereby realizing remote debugging and remote maintenance of mine equipment, realizing the unmanned mine function, and having high safety.

[0005] The technical solution of the present invention is a low-voltage permanent magnet vacuum feeder switch, comprising a housing, a circuit breaker core module and a position adjustment mechanism; two power cable introduction devices 1 and two power cable introduction devices 2 are respectively connected to the two sides of the upper part of the housing, and incoming line terminals and outgoing line terminals are provided inside, the incoming line terminals are electrically connected to the input conductive busbar, the input conductive busbar is electrically connected to the input connector, the outgoing line terminals are electrically connected to the output conductive busbar, and the output conductive busbar is electrically connected to the output connector; the circuit breaker core module includes an input contact and an output contact, the input contact faces the input connector, and the output contact faces the output connector; the position adjustment mechanism is arranged in the housing, driving the circuit breaker core module to move linearly, and simultaneously inserting the input contact into the input connector and the output contact into the output connector, or simultaneously detaching the input contact from the input connector and the output contact from the output connector.

[0006] Preferably, the circuit breaker core module further includes a bracket, an insulating housing mounted on the bracket, a protection unit circuit module, a vacuum tube connected to the input contact, a conductive busbar electrically connected between the vacuum tube and the output contact, a spring mechanism for opening or closing contacts within the vacuum tube, and a trigger assembly for triggering the spring mechanism. Both the input contact and the output contact are disposed through the insulating housing.

[0007] Preferably, the spring mechanism includes a bolt connected to the vacuum tube, a retaining ring arranged at the end of the bolt, sleeve 1 and sleeve 2 mounted on the bolt, and a spring mounted on the outer circumference of the bolt and connected to sleeve 1 and sleeve 2 at both ends respectively.

[0008] Preferably, the trigger assembly includes a limit assembly arranged in an insulating shell, a torsion spring mounted on the limit assembly and limited by the limit assembly at one end, a permanent magnet cylinder arranged in the insulating shell, a pull block connected to the output shaft of the permanent magnet cylinder and having a strip channel, a connecting shaft passing through the strip channel, a connecting frame arranged in the insulating shell and rotated by a rotating shaft, and a push plate arranged on the connecting frame, the bottom of the push plate has a notch for a retaining ring and a sleeve to extend into, the connecting shaft is arranged on the connecting frame, and the other end of the torsion spring is tensioned on the connecting shaft.

[0009] Preferably, the position adjustment mechanism includes a guide rail arranged in the shell, a screw rod rotatably arranged in the shell, a movable seat slidably arranged on the guide rail and threadedly connected to the screw rod, and a power structure for driving the screw rod to rotate, and the movable seat is arranged at the bottom of the circuit breaker core module.

[0010] Preferably, the power structure is a motor.

[0011] Preferably, the power structure includes a clamping column portion arranged at the outer end of the screw rod, a hand-cranked shaft passing through the outer shell, a tensioning spring abutting between the hand-cranked shaft and the outer shell, and an inserting platform portion arranged at the end of the hand-cranked shaft, and the clamping column portion has a clamping slot for inserting the inserting platform portion.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] This invention integrates the circuit breaker mechanism and peripheral components of the equipment into a highly integrated modular unit, resolving the issues of conventional feeder switch mechanisms, such as loose components, complex wiring connections, high failure rates, and the difficulty of disassembly and repair and replacement due to the limitations of dispersed components. While the circuit breaker mechanism module is electrically advanced and extended using a motor, the underground feeder switch can be remotely controlled from the ground, enabling remote debugging and maintenance of mine equipment, unmanned operation, and enhanced safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0016] Figure 3 It is an exploded view of the local structure of the present invention;

[0017] Figure 4 It is a partial structural cross-sectional view of the present invention;

[0018] Figure 5 This is a schematic diagram of the principle structure of the front and rear position adjustment of the circuit breaker core module;

[0019] Figure 6 It is a structural diagram of the circuit breaker core module;

[0020] Figure 7 This is a schematic diagram of the principle structure of controlling the opening and closing state of the contacts inside the vacuum tube through the permanent magnetic cylinder;

[0021] Figure 8 Schematic diagram of the internal structure of the circuit breaker core module.

[0022] Figure numerals: 1, bottom bracket; 2, housing 1; 3, housing 2; 4, partition 1; 5, partition 2; 6, cover; 7, handle; 8, power cable entry device 1; 9, incoming terminal; 10, input conductive busbar; 11, input connector; 12, output connector; 13, output conductive busbar; 14, outgoing terminal; 15, power cable entry device 2; 16, circuit breaker core module; 17, input contact; 18, output contact; 19, vacuum tube; 20, conductive busbar; 21, bolt; 22, retaining ring; 23, sleeve 1; 24, sleeve 2; 25, spring; 26, push plate; 27, insulating plate; 28, connecting frame; 281, rotating shaft; 29, connecting shaft; 30, pull block; 31, permanent Magnetic cylinder; 32. Torsion spring; 33. Sleeve rod; 34. Connecting rod; 35. Auxiliary contact; 36. Fixing plate; 37. Current transformer; 38. Zero sequence transformer; 39. Mounting base; 391. Resistor-capacitor absorption module; 40. Leakage signal transformer; 41. Protection unit circuit module; 411. Module control line output terminal; 42. Bracket; 43. Guide rail; 44. Screw; 441. Column; 45. Moving seat; 46. Motor; 47. Plug-in unit; 48. Hand crank shaft; 49. Tensioning spring; 50. Base; 51. Front door; 52. Human-machine screen; 53. Key box; 54. Hinge; 55. Connecting block; 56. Mounting plate; 57. Control transformer; 58. Control power fuse; 59. Power switch handle. DETAILED DESCRIPTION

[0023] like Figures 1-8 As shown, a low-voltage permanent magnet vacuum feeder switch includes a housing and an electric push-type circuit breaker core module.

[0024] like Figure 1-Figure 3As shown, the housing includes a bottom bracket 1, a shell 1 2 and a shell 2 3. Shell 1 2 is arranged on the bottom bracket 1 and has a main cavity inside. Shell 2 3 is arranged on the top of shell 1 2, and has a wire cavity inside shell 2 3. The lower part of shell 2 3 has a partition 1 4 that separates the wire cavity and the main cavity, and the middle part of shell 2 3 has a partition 2 5 that separates the wire cavity into an inlet cavity and an outlet cavity. The top of shell 2 3 has a top cover assembly for covering the inlet cavity and the outlet cavity respectively. The top cover assembly includes a cover plate 6 that is detachably connected to the top of shell 2 3 and a handle 7 welded to the top of the cover plate 6. The cover plate 6 is installed to the top of shell 2 3 by bolt connection. After unscrewing the bolts, it is convenient to remove it through the handle 7.

[0025] A front door 51 is hinged to one side of the front end of the shell 2 through a hinge 54. The front door 51 is provided with a human-machine screen 52 and a button box 53. The front door 51 is detachably connected to a card table that is snapped on the front end of the shell 2. The card table is a U-shaped structure and can be snapped on the front end of the shell 2 and then screwed on with bolts for connection.

[0026] Two power cable entry devices 8 communicating with the incoming line cavity are respectively provided on both sides of the shell 2 3 , and two power cable entry devices 15 communicating with the outgoing line cavity are respectively provided on both sides of the shell 2 3 . Both power cable entry devices are B5 type cable entry devices for power cable access.

[0027] Five explosion-proof cable entry devices are provided on the front side of the shell 2 3 and are connected to the outlet cavity, namely two A4 type explosion-proof cable entry devices and three A3 type explosion-proof cable entry devices, which are used for control line cable access.

[0028] An incoming terminal 9 and an outgoing terminal 14 are provided on the partition 1 4 inside the shell 2 3. The incoming terminal 9 is electrically connected to the input conductive bus 10, the input conductive bus 10 is electrically connected to the input connector 11, and the outgoing terminal 14 is electrically connected to the output conductive bus 13, and the output conductive bus 13 is electrically connected to the output connector 12.

[0029] The entire interior of the housing is divided into a main chamber, an inlet chamber, and an outlet chamber. This compartmentalizes the circuit breaker mechanism, the input terminals of the inlet terminals, and the output terminals of the outlet terminals, providing independent protection. When the front door 51 is opened to inspect the circuit breaker mechanism module 16, two sets of top cover assemblies cover the inlet and outlet chambers, respectively. When the top cover assembly on top of the inlet or outlet chamber is opened to inspect the power cable and terminal connection, the front door 51 remains closed. This facilitates independent inspection of the circuit breaker mechanism and the terminal and power cable connections.

[0030] like Figure 1 and Figure 2As shown, housing 1-2 houses a control transformer 57 and a control power fuse 58, and a power switch handle 59. The primary side of control transformer 57 is connected to incoming line terminals 9, where it receives power. The secondary side of control transformer 57 is connected to power switch handle 59 via control power fuse 58.

[0031] The electric propulsion type circuit breaker core module includes a circuit breaker core module 16 and a position adjustment mechanism.

[0032] like Figure 6 and Figure 7 As shown, the circuit breaker core module 16 includes a bracket 42, an insulating housing mounted on the bracket 42, a protection unit circuit module 41, an input contact 17 and an output contact 18 extending through the insulating housing, a vacuum tube 19 connected to the input contact 17, a conductive busbar 20 electrically connected between the vacuum tube 19 and the output contact 18, a spring mechanism that opens and closes the contacts within the vacuum tube 19, and a trigger assembly that triggers the spring mechanism. Both the input contact 17 and the output contact 18 are secured to the exterior of the insulating housing with thin nuts and spring washers. The input contact 17 forms a circuit with the output contact 18 via the vacuum tube 19 and the conductive busbar 20. Simply controlling the closing and opening of the vacuum tube 19 allows the feeder switch to be closed and opened, thereby controlling the downstream load. The input contact 17 faces the input connector 11, while the output contact 18 faces the output connector 12. A single input contact 17 and a single vacuum tube 19 constitute an input assembly. Three sets of input assemblies and three sets of output contacts 18 are provided. Correspondingly, three sets of incoming terminal blocks 9, input conductive busbars 10, input connectors 11, output connectors 12, output conductive busbars 13, outgoing terminal blocks 14, and spring mechanisms are provided. A protection unit circuit module 41 is located on one side of the insulating housing. It analyzes the signals used by the switch and determines whether to subsequently drive the switch to open. A module control line output terminal 411 is located on the side of the protection unit circuit module 41. This module control line output terminal 411 connects to the control line output terminal block within the outlet cavity, enabling external control of the feeder switch.

[0033] Rotate the power switch handle 59 clockwise from position 0 to position 1, energizing the control circuits of the device's keypad 53 and the electric-propelled circuit breaker module. When the feeder switch is closed, pressing the closing button on keypad 53 triggers the spring mechanism, which closes the contacts inside the vacuum tube 19. The current path is: incoming cables (3) → power cable entry device 1 8 → incoming terminal 9 → input conductive busbar 10 → input connector 11 (copper sleeve static contact, female) → input contact 17 (copper rod movable contact, male) → circuit breaker module 16 → output contact 18 (copper rod movable contact, male) → output connector 12 (copper sleeve static contact, female) → output conductive busbar 13 → outgoing terminal 14 → power cable entry device 2 15 → outgoing cables (3).

[0034] After the trip button on the key box 53 is pressed, the internal contacts of the vacuum tube 19 are disconnected and the busbar current path is cut off.

[0035] like Figure 7 As shown, the spring mechanism includes a bolt 21 connected to the vacuum tube 19, a retaining ring 22 arranged at the end of the bolt 21, a sleeve 1 23 and a sleeve 24 sleeved on the bolt 21, and a spring 25 sleeved on the outer periphery of the bolt 21 and connected to the sleeve 1 23 and the sleeve 2 24 at both ends respectively.

[0036] The trigger assembly includes a limit assembly disposed within an insulating housing, a torsion spring 32 mounted on the limit assembly and limited at one end by the limit assembly, a permanent magnet cylinder 31 disposed within the insulating housing, a pull block 30 connected to the output shaft of the permanent magnet cylinder 31 and having a strip-shaped channel, a connecting shaft 29 extending through the strip-shaped channel, a connecting frame 28 disposed within the insulating housing and rotatable by a rotating shaft 281, and a push plate 26 mounted on the connecting frame 28. The bottom of the push plate 26 has a notch for the retaining ring 22 and sleeve 23 to extend into. The connecting shaft 29 is mounted on the connecting frame 28, with the other end of the torsion spring 32 tensioned on the connecting shaft 29. The limit assembly includes a sleeve rod 33 and a connecting rod 34 disposed within the insulating housing, as well as a hook block disposed at the end of the connecting rod 34. The hook block has a through hole for inserting one end of the torsion spring 32. The torsion spring 32 is mounted on the outer circumference of the sleeve rod 33. When the permanent magnet cylinder 31 is not energized, the torsion spring 32 pushes the connecting shaft 29 outward, and the connecting shaft 29 pulls the output shaft of the permanent magnet cylinder 31 outward through the pulling block 30. The spring mechanism does not rebound, and the contact in the vacuum tube 19 is in a disconnected state.

[0037] like Figure 7As shown, a fixed plate 36 is installed within the insulating housing, on which an auxiliary contact 35 is mounted. An insulating plate 27, which triggers the auxiliary contact 35, is mounted on the connecting frame 28. When the closing button on the key box 53 is pressed, the coil inside the permanent magnet cylinder 31 is energized. Once the permanent magnet cylinder 31 is energized, the output shaft of the permanent magnet cylinder 31 contracts downward, driving the connecting frame 28 about the rotating axis 281 via the pull block 30 and the connecting shaft 29. This tightens the torsion spring 32, which in turn drives the push plate 26. The push plate 26 compresses the spring 25, triggering the spring mechanism to rebound, closing the open contacts in the vacuum tube 19 and closing the circuit breaker. When the circuit breaker is closed, the insulating plate 27 moves with the connecting frame 28, triggering the auxiliary contact 35 to operate. The auxiliary contact 35 then outputs a switch control signal, transmitting the switch closing / opening signal to other control circuits. The trigger assembly, through the spring mechanism, triggers the opening or closing of the contacts inside the vacuum tube, thereby controlling the opening and closing states.

[0038] like Figure 7 and Figure 8 As shown, the output contact 18 is provided with a current transformer 37, which is used to sample the switch bus current signal. A voltage transformer, a zero-sequence transformer 38, a mounting base 39, and a leakage signal transformer 40 are provided within the insulating housing. The voltage transformer is used to sample the switch bus system voltage signal, the zero-sequence transformer 38 is used to sample the switch bus zero-sequence current signal of ground leakage, and the leakage signal transformer 40 is used to sample the switch bus zero-sequence voltage signal of ground leakage. The mounting base 39 is provided with three RC absorption modules 391, which are used to absorb the back electromotive force of the switch open load.

[0039] The position adjustment mechanism is disposed within the housing and includes a guide rail 43 disposed within the housing 2, a screw 44 rotatably disposed within the housing 2, a movable base 45 slidably disposed on the guide rail 43 and threadedly connected to the screw 44, and a motor 46 that drives the screw 44. A base 50 is disposed within the housing 2, with the guide rail 43 specifically disposed on the base 50 and the screw 44 rotatably disposed on the base 50. The user controls the motor 46 via a human-machine interface 52 or keypad 53, or remotely controls the motor 46 by remotely controlling the output of the protection unit circuit module 41 of the unit through commands from a host computer via the RS485 communication terminal line in the wiring cavity of the unit. The motor 46 can drive the screw 44 in both forward and reverse directions, which in turn drives the movable base 45, which is linearly guided by the guide rail 43. A connecting block 55 is provided on the base 50 , and a mounting plate 56 is provided on the connecting block 55 . The input connectors 11 and the output connectors 12 are both provided on the mounting plate 56 , and the three input connectors 11 arranged side by side are correspondingly located below the three output connectors 12 arranged side by side.

[0040] The movable seat 45 is arranged at the bottom of the circuit breaker core module 16, specifically at the bottom of the bracket 42. The movable seat 45 can drive the circuit breaker core module 16 to move linearly, thereby realizing the purpose of the position adjustment mechanism driving the circuit breaker core module 16 to move linearly, and at the same time, the input contact 17 is inserted into the input connector 11, and the output contact 18 is inserted into the output connector 12 (at this time, the circuit breaker core module 16 is electrically pushed forward, and the contact moves to the position of the working position limit switch inside the main cavity, so that the equipment can be used normally and the equipment can be operated to close or open); or at the same time, the input contact 17 is separated from the input connector 11, and the output contact 18 is separated from the output connector 12 (at this time, the circuit breaker core module 16 is electrically pulled out, and the contact is correspondingly separated from the connector to maintain a safe distance. At this time, the equipment can be repaired). The position of the entire core module is adjusted by the position adjustment mechanism to leave sufficient maintenance operation space, and the contact is separated from the connector during maintenance to ensure that personnel can safely repair the core module.

[0041] In addition, a manual adjustment mechanism can be used to replace the motor 46 to drive the screw 44, or a manual adjustment mechanism can be added as an alternative driving method based on the motor 46. Specifically, the manual adjustment mechanism includes a clamping column 441 provided at the outer end of the screw 44, a hand crank shaft 48 extending through the front door 51, a tensioning spring 49 abutting between the hand crank shaft 48 and the front door 51, and an insertion platform 47 provided at the end of the hand crank shaft 48. The end of the hand crank shaft 48 has a hexagonal notch, and the clamping column 441 has a slot for the insertion platform 47 to be inserted. During manual operation, the user inserts the corresponding tool into the hand-crank shaft 48, pushes the hand-crank shaft 48 forward, compresses the tensioning spring 49, inserts the inserting portion 47 into the slot of the clamping column portion 441, rotates the hand-crank shaft 48, and drives the screw rod 44 to rotate through the inserting portion 47 and the clamping column portion 441 to push or pull out the circuit breaker core module 16, insert the contact into the connector, or remove the contact from the connector.

[0042] The present invention highly integrates the circuit breaker mechanism and peripheral components of the equipment into a modular unit, solving the problems of loose components of conventional feeder switch mechanisms, messy connection lines between components, high failure rate, and the mechanism being limited by scattered components, which makes it difficult to disassemble and extremely inconvenient to repair and replace. The six copper rod-type moving contacts extending from the circuit breaker mechanism module 16 and the six copper sleeve-type static contacts of the main circuit are tightly matched using shafts and sleeves. The shafts and sleeves are electrically pushed forward, electrically pulled out, or manually operated to achieve tight matching. When the motor 46 is used to electrically push and pull out the circuit breaker mechanism module 16, the operation of the underground feeder switch can be remotely controlled from the ground, realizing remote debugging and remote maintenance of mine equipment, and realizing the unmanned mine function with high safety.

[0043] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A low-voltage permanent magnet vacuum feed switch, characterized in that: include: The housing has two power cable introduction devices (1) and two power cable introduction devices (15) connected to the upper sides thereof, and an incoming line terminal (9) and an outgoing line terminal (14) are provided inside. The incoming line terminal (9) is electrically connected to an input conductive busbar (10), the input conductive busbar (10) is electrically connected to an input connector (11), the outgoing line terminal (14) is electrically connected to an output conductive busbar (13), and the output conductive busbar (13) is electrically connected to an output connector (12); A circuit breaker core module (16) includes an input contact (17) and an output contact (18), wherein the input contact (17) faces the input connector (11) and the output contact (18) faces the output connector (12); A position adjustment mechanism is provided in the housing and drives the circuit breaker core module (16) to move linearly, and simultaneously inserts the input contact (17) into the input connector (11) and inserts the output contact (18) into the output connector (12), or simultaneously detaches the input contact (17) from the input connector (11) and detaches the output contact (18) from the output connector (12).

2. A low-voltage permanent magnet vacuum feeder switch according to claim 1, characterized in that: The circuit breaker core module (16) further includes a bracket (42), an insulating shell and a protection unit circuit module (41) arranged on the bracket (42), a vacuum tube (19) connected to the input contact (17), a conductive busbar (20) electrically connected between the vacuum tube (19) and the output contact (18), a spring mechanism for opening or closing the internal contacts of the vacuum tube (19), and a trigger assembly for triggering the spring mechanism to operate. The input contact (17) and the output contact (18) are both arranged through the insulating shell.

3. A low-voltage permanent magnet vacuum feeder switch according to claim 2, characterized in that: The spring mechanism comprises a bolt (21) connected to the vacuum tube (19), a retaining ring (22) arranged at the end of the bolt (21), a sleeve 1 (23) and a sleeve 2 (24) sleeved on the bolt (21), and a spring (25) sleeved on the outer periphery of the bolt (21) and having two ends respectively connected to the sleeve 1 (23) and the sleeve 2 (24).

4. A low-voltage permanent magnet vacuum feeder switch according to claim 3, characterized in that: The trigger assembly comprises a limit assembly arranged in an insulating shell, a torsion spring (32) sleeved on the limit assembly and limited at one end by the limit assembly, a permanent magnet cylinder (31) arranged in the insulating shell, a pull block (30) connected to the output shaft of the permanent magnet cylinder (31) and having a strip-shaped channel, a connecting shaft (29) passing through the strip-shaped channel, a connecting frame (28) arranged in the insulating shell and rotated by a rotating shaft (281), and a push plate (26) arranged on the connecting frame (28), wherein the bottom of the push plate (26) has a notch for a retaining ring (22) and a sleeve (23) to extend into, the connecting shaft (29) is arranged on the connecting frame (28), and the other end of the torsion spring (32) is tensioned on the connecting shaft (29).

5. The low-voltage permanent magnet vacuum feeder switch according to claim 1, characterized in that: The position adjustment mechanism comprises a guide rail (43) arranged in a housing, a screw rod (44) rotatably arranged in the housing, a moving seat (45) slidably arranged on the guide rail (43) and threadedly connected to the screw rod (44), and a power structure for driving the screw rod (44) to rotate. The moving seat (45) is arranged at the bottom of the circuit breaker core module (16).

6. The low-voltage permanent magnet vacuum feeder switch according to claim 5, characterized in that: The power structure is a motor (46).

7. The low-voltage permanent magnet vacuum feeder switch according to claim 5, characterized in that: The power structure comprises a clamping column portion (441) arranged at the outer end of a screw rod (44), a hand crank shaft (48) penetrating the housing, a tensioning spring (49) abutting between the hand crank shaft (48) and the housing, and an inserting platform portion (47) arranged at the end of the hand crank shaft (48). The clamping column portion (441) has a clamping groove for inserting the inserting platform portion (47).

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