CN112583104B - Mining uninterrupted direct current power supply control box - Google Patents
Mining uninterrupted direct current power supply control box Download PDFInfo
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- CN112583104B CN112583104B CN202011385352.5A CN202011385352A CN112583104B CN 112583104 B CN112583104 B CN 112583104B CN 202011385352 A CN202011385352 A CN 202011385352A CN 112583104 B CN112583104 B CN 112583104B
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- air inlet
- power supply
- arc
- extinguishing switch
- air
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/52—Cooling of switch parts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/035—Gas-insulated switchgear
- H02B13/0354—Gas-insulated switchgear comprising a vacuum switch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention relates to the technical field of power control, in particular to a mining uninterrupted direct current power supply control box. The circuit breaker comprises an arc extinguishing switch, an air inlet plug, a locking device, a pre-breaking device and an electromagnetic control device, wherein the arc extinguishing switch is provided with an air suction hole and an air inlet channel, and the air suction hole is communicated with the air suction device. When the arc-extinguishing switch is turned on, the air inlet channel is communicated with the external atmosphere, and the air extractor is used for extracting air from the interior of the arc-extinguishing switch so as to realize ventilation and air exchange and ensure that the arc-extinguishing switch effectively dissipates heat; when the voltage of the main power supply is higher than a preset value, the electromagnetic control device enables the air inlet plug to block the air inlet channel, the air extractor continues to extract air to enable the vacuum degree inside the arc-extinguishing switch to become large, when the vacuum degree inside the arc-extinguishing switch is higher than the preset value, the arc-extinguishing switch is disconnected, and meanwhile arcing is avoided in the vacuum environment inside the arc-extinguishing switch at the moment.
Description
Technical Field
The invention relates to the technical field of power control, in particular to a mining uninterrupted direct current power supply control box.
Background
Uninterruptible power supplies are power supplies that include energy storage devices, and are primarily used to provide continuous power to a portion of equipment that has high requirements for power stability. The uninterruptible power supply is widely applied to the fields of mines, aerospace, national defense, hospitals, emergency lighting systems, railways, nuclear power stations, fire safety alarm systems and the like.
The mining uninterrupted direct current power supply is required to have extremely strong explosion-proof function due to the special environment, and the vacuum circuit breaker for explosion prevention has the problems of difficult heat dissipation and poor explosion-proof performance. It is therefore necessary to provide a vacuum switch having both high explosion protection and good heat dissipation.
Disclosure of Invention
According to at least one defect of the prior art, the invention provides a mining uninterrupted direct current power supply control box, which aims to solve the problems that the existing uninterrupted direct current control power supply is difficult to dissipate heat and has poor explosion-proof performance.
The invention relates to a mining uninterrupted direct current power supply control box which adopts the following technical scheme: the circuit breaker is connected between the main power supply and the load circuit, so that the connection between the main power supply and the load circuit is disconnected when the voltage of the main power supply is higher than a preset value; the circuit breaker comprises an arc extinguishing switch, an air inlet plug, a locking device, a pre-breaking device and an electromagnetic control device;
the air inlet channel is communicated with the outside atmosphere when the arc-extinguishing switch is conducted, and the air exhaust device is used for exhausting air in the arc-extinguishing switch so as to realize ventilation;
the locking device is arranged on the arc-extinguishing switch, and the movable conductive component and the static conductive component of the arc-extinguishing switch are kept electrically connected under the action of air pressure inside and outside the arc-extinguishing switch;
when the voltage of the main power supply is higher than a preset value, the output end of the electromagnetic control device acts and enables the air inlet plug to block the air inlet channel of the arc-extinguishing switch through the transmission device, the pre-breaking device accumulates the force for breaking the movable conductive component and the static conductive component, the air extractor extracts air from the inside of the arc-extinguishing switch, so that the vacuum degree of the inside of the arc-extinguishing switch becomes large, when the vacuum degree of the inside of the arc-extinguishing switch is higher than the preset value, the locking device releases the locking of the movable conductive component under the action of the internal and external air pressure of the arc-extinguishing switch, and the force accumulated by the pre-breaking device breaks the arc-extinguishing switch, so that arcing is avoided in the vacuum environment at the moment inside the arc-extinguishing switch.
Optionally, the arc extinguishing switch comprises an insulating shell, the air suction hole is arranged on the lower side wall of the insulating shell, and the air inlet channel is arranged on the upper side wall of the insulating shell; the air inlet channel comprises a first air inlet hole, a second air inlet hole and a third air inlet hole, the first air inlet hole and the second air inlet hole are vertical and are arranged at intervals, the first air inlet hole penetrates through the upper surface of the insulating shell, the second air inlet hole penetrates through the upper side wall of the insulating shell, and the third air inlet hole is horizontally connected between the first air inlet hole and the second air inlet hole;
the electromagnetic control device drives the air inlet plug to move upwards through the transmission device when the main power supply voltage is higher than a preset value, and the first air inlet and the third air inlet are staggered;
a first reset spring is arranged between the air inlet plug and the second air inlet hole so as to enable the air inlet plug to reset.
Optionally, the pre-breaking device comprises a first connecting tension spring and a transmission sleeve, the transmission sleeve is installed on the movable conductive assembly and is in sliding connection with the movable conductive assembly, the first connecting tension spring is sleeved on the movable conductive assembly and is connected with the movable conductive assembly and the transmission sleeve, when the voltage of the main power supply is higher than a preset value, the electromagnetic control device controls the transmission sleeve to move along the movable conductive assembly through the transmission device, and then pulls the first connecting tension spring away, and the first connecting tension spring accumulates the force for enabling the movable conductive assembly to be far away from the static conductive assembly.
Optionally, the locking device comprises a permanent magnet block, a locking magnetic buckle, a first fixed spring and a second fixed spring, wherein the permanent magnet block is slidably installed in the first air inlet hole, the first fixed spring is connected between the first air inlet hole and the permanent magnet block along the vertical direction, the lower end of the first air inlet hole is communicated with the inside of the insulating shell, the locking magnetic buckle is installed in the movable conductive assembly through the second fixed spring, and the polarities of the two corresponding sides of the permanent magnet block and the locking magnetic buckle are opposite;
the upper side wall of the insulating shell is provided with a sliding hole, the movable conductive assembly penetrates through the sliding hole, the lower side of the third air inlet hole is provided with a locking hole which extends horizontally, the locking hole is communicated with the first air inlet hole and the sliding hole, when the static conductive assembly and the movable conductive assembly are conducted, the permanent magnet block corresponds to the locking magnetic buckle, and the locking magnetic buckle is positioned in the locking hole under the action of magnetic attraction to prevent the movable conductive assembly from moving; when the vacuum degree in the insulating shell is increased and is higher than a preset value, the permanent magnet blocks move downwards against the elastic force of the first fixed springs, the locking magnetic buckle and the permanent magnet blocks are far away from each other and the magnetic force is weakened, and the locking magnetic buckle retreats into the movable conductive assembly under the acting force of the second fixed springs so as to allow the movable conductive assembly to move;
the locking device further comprises a sealing sliding block, and the sealing sliding block is connected below the permanent magnet block.
Optionally, the movable conductive component is provided with a plunger, the plunger is located in the air extraction hole, in a conventional state, the plunger is communicated with the air extraction hole, and after the static conductive component is separated from the movable conductive component, the plunger moves upwards along with the movable conductive component so as to block the air extraction hole, thereby maintaining the vacuum degree inside the insulating shell.
Optionally, the transmission device comprises a transmission rod and a supporting sleeve, the supporting sleeve is movably hinged with the insulating shell through a supporting frame, the transmission rod is slidably inserted into the supporting sleeve, one end of the transmission rod is hinged with the transmission sleeve, and the other end of the transmission rod is connected with the output end of the electromagnetic control device;
the transmission rod is sleeved with a transmission sliding block in a sliding manner, and the transmission sliding block is connected with the air inlet plug through a second reset spring.
Optionally, the output end of the electromagnetic control device is an armature, the electromagnetic control device further comprises an electromagnet and a second connecting tension spring, the electromagnet is fixedly arranged, the armature is arranged on the opposite side of the electromagnet through the second connecting tension spring, and the armature is movably hinged with the transmission rod.
Optionally, the insulating shell includes from last sealed lid of moving end, ceramic body and the sealed lid of quiet end that connects gradually down, quiet conductive component includes static contact and quiet conducting rod, move conductive component and include moving contact and moving conductive rod, quiet conducting rod fixed mounting in sealed lid of quiet end and extend to inside the insulating shell, move conductive rod slidable mounting in sealed lid of moving end, the static contact with the moving contact connect respectively in quiet conducting rod with the inner of moving conductive rod.
Optionally, the outer circumferential surfaces of the fixed contact and the moving contact are both provided with an insulating housing, a shielding housing is arranged in the insulating housing, and the fixed contact and the moving contact are positioned in the shielding housing.
Optionally, the preset voltage of the main power supply is higher than the preset voltage of the standby power supply, the main power supply supplies power to the load circuit in a normal state, and when the voltage of the main power supply is lower than the voltage of the standby power supply, the main power supply is automatically switched to the standby power supply to supply power to the load circuit; and when the voltage of the main power supply rises and is higher than a preset value, the circuit breaker is switched to the standby power supply to supply power to the load circuit.
The beneficial effects of the invention are as follows: according to the mining uninterrupted direct-current power supply control box, the air suction hole and the air inlet channel are formed in the arc extinguishing switch, the inside of the arc extinguishing switch is communicated with the outside, the air suction hole is connected with the upper air suction device, and when the arc extinguishing switch is disconnected, the arc is restrained from generating in a vacuum state, so that an arc extinguishing and explosion preventing effect is achieved; when the arc extinguishing switch is in an on state, the arc extinguishing switch is in a ventilation state, so that the heat dissipation problem is solved. Therefore, the uninterrupted direct-current power supply control box has high explosion-proof performance and high heat dissipation performance, and is high in safety coefficient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, it being understood that these drawings are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a circuit arrangement of a mining uninterruptible DC power supply control box of the present invention;
fig. 2 is a schematic diagram of the overall structure of the arc extinguishing switch according to the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic view of an internal structure of the arc extinguishing switch when closed in the present invention;
fig. 5 is a schematic diagram of an internal structure of the arc extinguishing switch before being opened;
fig. 6 is a schematic diagram of an internal structure of the arc extinguishing switch after the arc extinguishing switch is opened;
FIG. 7 is a schematic diagram of the electromagnetic control device according to the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 4 at B;
fig. 9 is a partial enlarged view of C in fig. 4.
In the figure: 100. a static end sealing cover; 101. an air suction hole; 102. a second communication hole; 200. a movable end sealing cover; 201. a first air inlet hole; 202. a second air inlet hole; 203. a third air inlet hole; 204. a first communication hole; 205. a locking hole; 300. a ceramic tube body; 400. a moving contact; 402. a plunger; 403. a second air inlet; 405. a movable conductive rod; 500. a stationary contact; 501. an insulating housing; 502. a static conductive rod; 600. locking the magnetic buckle; 601. a second fixed spring; 700. a transmission rod; 702. a support sleeve; 800. an air inlet plug; 801. a first air inlet; 802. a second return spring; 803. a transmission slide block; 804. a first return spring; 900. permanent magnet blocks; 901. a sealing slide block; 902. a first fixed spring; 1000. a transmission sleeve; 1001. a first connecting tension spring; 1100. an armature; 1101. the connecting support is connected; 1200. an electromagnet; 1300. a second connecting tension spring; 1400. and (5) mounting a frame.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 9, the mining uninterrupted direct current power supply control box comprises a box body (not shown in the figure), a main power supply (U in the figure 1), a standby power supply (standby battery pack in the figure 1) and a circuit breaker (QS in the figure 1), wherein the circuit breaker is connected between the main power supply and a load circuit, the preset voltage of the main power supply is higher than that of the standby power supply, the main power supply supplies power to the load circuit in a normal state, and the standby power supply is in a floating charge state. When the voltage of the main power supply is lower than that of the standby power supply, the automatic switching is performed by the standby power supply to supply power to the load circuit, and the automatic switching mode can be realized by arranging diodes on the main power supply circuit and the standby power supply circuit, conducting the output on the side with higher voltage, or adopting other modes. When the voltage of the main power supply rises and is higher than a preset value, the circuit breaker disconnects the main power supply from the load circuit, so that the power supply is switched to the standby power supply through the circuit breaker to supply power to the load circuit.
The circuit breaker includes an arc extinguishing switch, an air inlet plug 800, a locking device, a pre-breaking device and an electromagnetic control device. The arc extinguishing switch is provided with an air extraction hole 101 and an air inlet channel which are communicated with the inside of the arc extinguishing switch, and an air extraction device connected with the air extraction hole 101 is arranged outside the arc extinguishing switch and can be an external air pump, such as M in fig. 1. When the arc-extinguishing switch is conducted, the air inlet channel is communicated with the external atmosphere, and the air extractor is used for extracting air from the inside of the arc-extinguishing switch so as to realize ventilation and air exchange and ensure effective heat dissipation of the arc-extinguishing switch. The locking device is arranged on the arc-extinguishing switch, and the movable conductive component and the static conductive component of the arc-extinguishing switch are kept electrically connected under the action of air pressure inside and outside the arc-extinguishing switch.
When the voltage of the main power supply is higher than a preset value, the output end of the electromagnetic control device acts and enables the air inlet plug 800 to block the air inlet channel of the arc extinguishing switch through the transmission device, and enables the pre-breaking device to accumulate the force for breaking the movable conductive component and the static conductive component. The air extractor continues to bleed to the inside of explosion switch to make the inside vacuum grow of explosion switch, when the inside vacuum of explosion switch is higher than the default, locking device releases the locking to moving conductive assembly under the inside and outside atmospheric pressure's of explosion switch effect, and the force of pre-breaking device accumulation makes the explosion switch break off, avoids the arcing under the vacuum environment of the inside this moment of explosion switch simultaneously. The inside of the arc-extinguishing switch is communicated with the outside through the scheme, and is connected with the air extractor, so that the arc is restrained from generating in a vacuum state when the arc-extinguishing switch is disconnected, and the arc-extinguishing and explosion-proof effects are achieved; when the arc extinguishing switch is in an on state, the arc extinguishing switch is in a ventilation state, so that the heat dissipation problem is solved.
In this embodiment, the arc extinguishing switch includes an insulating case, the gas pumping hole 101 is provided at a lower sidewall of the insulating case, and the gas inlet passage is provided at an upper sidewall of the insulating case. The air inlet channel comprises a first air inlet hole 201, a second air inlet hole 202 and a third air inlet hole 203, the first air inlet hole 201 and the second air inlet hole 202 are vertical and are arranged at intervals, the first air inlet hole 201 penetrates through the upper surface of the insulating shell, the second air inlet hole 202 penetrates through the upper side wall of the insulating shell, and the third air inlet hole 203 is horizontally connected between the first air inlet hole 201 and the second air inlet hole 202. The air inlet plug 800 is inserted into the upper end of the second air inlet 202, the air inlet plug 800 is hollow, a first air inlet 801 is formed in the side wall of the air inlet plug 800, when the static conductive component is contacted with the movable conductive component, the first air inlet 801 is communicated with the third air inlet 203, when the main power supply voltage is higher than a preset value, the electromagnetic control device drives the air inlet plug 800 to move upwards through the transmission device, the first air inlet 801 and the third air inlet 203 are staggered, so that an air inlet channel is cut off, the air exhaust device exhausts air from the inside of the insulating shell, and the vacuum degree inside the insulating shell is improved.
A first return spring 804 is provided between the intake plug 800 and the second intake hole 202 to urge the intake plug 800 to return. Specifically, the upper end portion of the second air intake hole 202 is provided with a mounting hole having a diameter larger than that of the second air intake hole 202, the left side of the mounting hole is provided with a placement groove, the outer peripheral wall surface of the air intake plug 800 is provided with a protrusion, the height of the protrusion is smaller than the depth of the placement groove, and the first return spring 804 is vertically connected between the upper limiting surface of the placement groove and the lower surface of the protrusion. In order to facilitate the installation of the air inlet plug 800, a vertical guide groove communicated with the placing groove is arranged on the inner side wall of the installation hole, and the bulge is downwards placed along the vertical guide groove and then rotates to enter the placing groove after reaching the joint of the vertical guide groove and the placing groove.
In this embodiment, the pre-breaking device includes a first connection tension spring 1001 and a transmission sleeve 1000, the transmission sleeve 1000 is mounted on the movable conductive assembly and slidably connected with the movable conductive assembly, and the first connection tension spring 1001 is sleeved on the movable conductive assembly and connected with the movable conductive assembly and the transmission sleeve 1000. When the voltage of the main power supply is higher than a preset value, the electromagnetic control device controls the transmission sleeve 1000 to move upwards along the movable conductive component through the transmission device, and then pulls the first connection tension spring 1001, and the first connection tension spring 1001 accumulates the force for enabling the movable conductive component to be far away from the static conductive component.
In this embodiment, the locking device includes a permanent magnet 900, a locking magnetic buckle 600, a first fixing spring 902 and a second fixing spring 601, where the permanent magnet 900 is slidably mounted in the first air inlet 201, the first fixing spring 902 is vertically connected between the first air inlet 201 and the permanent magnet 900, the lower end of the first air inlet 201 is communicated with the inside of the insulating shell through the first communication hole 204, the locking magnetic buckle 600 is mounted in the movable conductive component through the second fixing spring 601, and polarities of two opposite sides of the permanent magnet 900 and the locking magnetic buckle 600 are opposite.
The upper side wall of the insulating housing is provided with a sliding hole, the movable conductive assembly penetrates through the sliding hole, the lower side of the third air inlet 203 is provided with a locking hole 205 which extends horizontally, and the locking hole 205 is communicated with the first air inlet 201 and the sliding hole. When the static conductive component and the movable conductive component are conducted, the permanent magnet 900 corresponds to the locking magnetic buckle 600, and the locking magnetic buckle 600 is positioned in the locking hole 205 under the action of magnetic attraction to block the movement of the movable conductive component; when the vacuum degree in the insulating case is increased and higher than a preset value, the permanent magnet 900 moves downward against the elastic force of the first fixing spring 902 under the action of the air pressure difference in the insulating case, the locking magnet buckle 600 and the permanent magnet 900 are far away from each other, the magnetic force is weakened, and the locking magnet buckle 600 retreats into the movable conductive assembly under the action of the second fixing spring 601 to allow the movable conductive assembly to move.
In order to improve the sealing effect of the locking device, the locking device further comprises a sealing slide block 901, wherein the sealing slide block 901 is connected below the permanent magnet block 900, the sealing slide block 901 is in sliding connection with the first air inlet hole 201, and the first fixed spring 902 is connected between the sealing slide block 901 and the lower bottom surface of the first air inlet hole 201.
In this embodiment, the movable conductive component is provided with the plunger 402, the plunger 402 is located in the air pumping hole 101, under a conventional state, the plunger 402 is communicated with the air pumping hole 101, after the static conductive component and the movable conductive component are separated, the plunger 402 moves upwards along with the movable conductive component to block the air pumping hole 101, so as to maintain the vacuum degree inside the insulating shell, and the arc extinguishing effect can be still achieved when the movable conductive component and the static conductive component are connected next time. Specifically, a second air inlet 403 is disposed on a side wall of the plunger 402, a second communication hole 102 for communicating the inside of the insulating housing with the first air pumping hole 101 is disposed on a lower side wall of the insulating housing, the second air inlet 403 and the second communication hole 102 are communicated in a conventional state, and after the static conductive component and the dynamic conductive component are separated, the second air inlet 403 and the second communication hole 102 are dislocated to block the air pumping hole 101.
In this embodiment, the transmission device includes a transmission rod 700 and a supporting sleeve 702, a supporting frame is disposed on the insulating shell, the supporting sleeve 702 is movably hinged to the supporting frame, the transmission rod 700 is slidably inserted into the supporting sleeve 702, one end of the transmission rod is hinged to the transmission sleeve 1000, and the other end of the transmission rod is connected to an output end of the electromagnetic control device. The transmission rod 700 is sleeved with a transmission slide block 803 in a sliding manner, the transmission slide block 803 is connected with the air inlet plug 800 through a second reset spring 802, and when the transmission rod 700 rotates anticlockwise downwards, the air inlet plug 800 is pulled to move upwards through the second reset spring 802, and the transmission sleeve 1000 is driven to slide upwards along the movable conductive assembly.
In this embodiment, the output end of the electromagnetic control device is the armature 1100, the electromagnetic control device further includes the electromagnet 1200 and the second connecting tension spring 1300, the electromagnet 1200 is fixedly arranged, the armature 1100 is arranged at the opposite side of the electromagnet 1200 through the second connecting tension spring 1300, and the armature 1100 is movably hinged with the transmission rod 700. A coupling mount 1101 is provided on a sidewall of the armature 1100 to facilitate coupling with the actuator 700. The electromagnetic control device is mounted on the insulating shell of the arc-extinguishing switch through the mounting frame 1400, and the mounting bracket and the insulating shell of the arc-extinguishing switch can be set at proper angles according to the position of the transmission rod 700, so that the reliable transmission of the transmission rod 700 is facilitated. When the voltage of the main power supply rises and is higher than a preset value, the magnetic force of the electromagnet 1200 increases, so that the armature 1100 is driven to move downwards against the pulling force of the second connecting tension spring 1300, and the transmission rod 700 is driven to rotate clockwise and move towards the upper end of the transmission rod 700 along the supporting sleeve 702. When the voltage of the main power source is reduced and is lower than a preset value, the magnetic force of the electromagnet 1200 is weakened, and the armature 1100 is reset under the acting force of the second connection tension spring 1300.
In this embodiment, the insulating case includes a movable end sealing cap 200, a ceramic tube body 300 and a stationary end sealing cap 100 which are sequentially connected from top to bottom, the movable end sealing cap 200 forms an upper sidewall of the insulating case, the stationary end sealing cap 100 forms a lower sidewall of the insulating case, and the insulating case is provided in a split structure for easy installation. The static conductive component comprises a static contact 500 and a static conductive rod 502, the movable conductive component comprises a movable contact 400 and a movable conductive rod 405, the static conductive rod 502 is fixedly arranged on the static end sealing cover 100 and extends to the inside of the insulating shell, the movable conductive rod 405 is slidably arranged on the movable end sealing cover 200, and the static contact 500 and the movable contact 400 are respectively connected to the inner ends of the static conductive rod 502 and the movable conductive rod 405. An installation groove is formed in the outer circular surface of the movable conducting rod 405, a second fixing spring 601 is connected between the locking magnetic buckle 600 and the installation groove, and the locking magnetic buckle 600 is located in the installation groove under the action of the second fixing spring 601. The outer circumferential surface of the movable conductive rod 405 is provided with a collar protruding outward, and a first connection tension spring 1001 is connected between the collar and the transmission sleeve 1000, and the collar is provided to facilitate the installation of the first connection tension spring 1001.
The outer circular surfaces of the fixed contact 500 and the moving contact 400 are provided with insulating shells 501, shielding cases are arranged in the insulating shells, and the fixed contact 500 and the moving contact 400 are positioned inside the shielding cases.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. The utility model provides a mining uninterrupted type DC power supply control box which characterized in that: the circuit breaker is connected between the main power supply and the load circuit, so that the connection between the main power supply and the load circuit is disconnected when the voltage of the main power supply is higher than a preset value; the circuit breaker comprises an arc extinguishing switch, an air inlet plug, a locking device, a pre-breaking device and an electromagnetic control device;
the air inlet channel is communicated with the outside atmosphere when the arc-extinguishing switch is conducted, and the air exhaust device is used for exhausting air in the arc-extinguishing switch so as to realize ventilation;
the locking device is arranged on the arc-extinguishing switch, and the movable conductive component and the static conductive component of the arc-extinguishing switch are kept electrically connected under the action of air pressure inside and outside the arc-extinguishing switch;
when the voltage of the main power supply is higher than a preset value, the output end of the electromagnetic control device acts and enables the air inlet plug to block an air inlet channel of the arc-extinguishing switch through the transmission device, the pre-breaking device accumulates the force for breaking the movable conductive component and the static conductive component, the air extraction device extracts air from the inside of the arc-extinguishing switch to enable the vacuum degree of the inside of the arc-extinguishing switch to be large, and when the vacuum degree of the inside of the arc-extinguishing switch is higher than the preset value, the locking device releases the locking of the movable conductive component under the action of the internal and external air pressure of the arc-extinguishing switch, and the force accumulated by the pre-breaking device breaks the arc-extinguishing switch and avoids arcing in the vacuum environment at the moment inside of the arc-extinguishing switch;
the arc extinguishing switch comprises an insulating shell, the air suction hole is formed in the lower side wall of the insulating shell, and the air inlet channel is formed in the upper side wall of the insulating shell; the air inlet channel comprises a first air inlet hole, a second air inlet hole and a third air inlet hole, the first air inlet hole and the second air inlet hole are vertical and are arranged at intervals, the first air inlet hole penetrates through the upper surface of the insulating shell, the second air inlet hole penetrates through the upper side wall of the insulating shell, and the third air inlet hole is horizontally connected between the first air inlet hole and the second air inlet hole; the electromagnetic control device drives the air inlet plug to move upwards through the transmission device when the main power supply voltage is higher than a preset value, and the first air inlet and the third air inlet are staggered; a first reset spring is arranged between the air inlet plug and the second air inlet hole so as to enable the air inlet plug to reset;
the locking device comprises a permanent magnet block, a locking magnetic buckle, a first fixed spring and a second fixed spring, wherein the permanent magnet block is slidably arranged in the first air inlet hole, the first fixed spring is connected between the first air inlet hole and the permanent magnet block along the vertical direction, the lower end of the first air inlet hole is communicated with the inside of the insulating shell, the locking magnetic buckle is arranged in the movable conductive assembly through the second fixed spring, and the polarities of the two corresponding sides of the permanent magnet block and the locking magnetic buckle are opposite; the upper side wall of the insulating shell is provided with a sliding hole, the movable conductive assembly penetrates through the sliding hole, the lower side of the third air inlet hole is provided with a locking hole which extends horizontally, the locking hole is communicated with the first air inlet hole and the sliding hole, when the static conductive assembly and the movable conductive assembly are conducted, the permanent magnet block corresponds to the locking magnetic buckle, and the locking magnetic buckle is positioned in the locking hole under the action of magnetic attraction to prevent the movable conductive assembly from moving; when the vacuum degree in the insulating shell is increased and is higher than a preset value, the permanent magnet blocks move downwards against the elastic force of the first fixed springs, the locking magnetic buckle and the permanent magnet blocks are far away from each other and the magnetic force is weakened, and the locking magnetic buckle retreats into the movable conductive assembly under the acting force of the second fixed springs so as to allow the movable conductive assembly to move; the locking device further comprises a sealing sliding block, and the sealing sliding block is connected below the permanent magnet block.
2. The mining uninterruptible direct current power supply control box according to claim 1, wherein: the pre-breaking device comprises a first connecting tension spring and a transmission sleeve, the transmission sleeve is installed on the movable conductive assembly and is in sliding connection with the movable conductive assembly, the first connecting tension spring is sleeved on the movable conductive assembly and is connected with the movable conductive assembly and the transmission sleeve, when the voltage of a main power supply is higher than a preset value, the electromagnetic control device controls the transmission sleeve to move along the movable conductive assembly through the transmission device, and then the first connecting tension spring is pulled away, and the first connecting tension spring accumulates the force for enabling the movable conductive assembly to be far away from the static conductive assembly.
3. The mining uninterruptible direct current power supply control box according to claim 1, wherein: the movable conductive assembly is provided with a plunger, the plunger is located in the air exhaust hole, in a conventional state, the plunger is communicated with the air exhaust hole, and after the static conductive assembly is separated from the movable conductive assembly, the plunger moves upwards along with the movable conductive assembly to block the air exhaust hole, so that the vacuum degree inside the insulating shell is maintained.
4. The mining uninterruptible direct current power supply control box according to claim 2, wherein: the transmission device comprises a transmission rod and a support sleeve, the support sleeve is movably hinged with the insulating shell through a support frame, the transmission rod is slidably inserted into the support sleeve, one end of the transmission rod is hinged with the transmission sleeve, and the other end of the transmission rod is connected with the output end of the electromagnetic control device;
the transmission rod is sleeved with a transmission sliding block in a sliding manner, and the transmission sliding block is connected with the air inlet plug through a second reset spring.
5. The mining uninterruptible direct current power supply control box according to claim 4, wherein: the output end of the electromagnetic control device is an armature, the electromagnetic control device further comprises an electromagnet and a second connecting tension spring, the electromagnet is fixedly arranged, the armature is arranged on the opposite side of the electromagnet through the second connecting tension spring, and the armature is movably hinged with the transmission rod.
6. The mining uninterruptible direct current power supply control box according to claim 1, wherein: the insulating shell comprises a movable end sealing cover, a ceramic tube body and a static end sealing cover which are sequentially connected from top to bottom, the static conductive assembly comprises a static contact and a static conductive rod, the movable conductive assembly comprises a movable contact and a movable conductive rod, the static conductive rod is fixedly arranged in the static end sealing cover and extends to the inside of the insulating shell, the movable conductive rod is slidably arranged in the movable end sealing cover, and the static contact and the movable contact are respectively connected to the static conductive rod and the inner end of the movable conductive rod.
7. The mining uninterruptible direct current power supply control box according to claim 6, wherein: the fixed contact and the outer circumferential surface of the moving contact are both provided with insulating covers, shielding covers are arranged in the insulating covers, and the fixed contact and the moving contact are located inside the shielding covers.
8. The mining uninterruptible direct current power supply control box according to claim 5, wherein: the preset voltage of the main power supply is higher than the preset voltage of the standby power supply, the main power supply supplies power to the load circuit in a conventional state, and when the voltage of the main power supply is lower than the voltage of the standby power supply, the main power supply is automatically switched to the standby power supply to supply power to the load circuit; when the voltage of the main power supply rises and is higher than a preset value, the main power supply is disconnected through the circuit breaker, and the standby power supply is switched to supply power for the load circuit.
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