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CN-114792610-B - Power supply system and switch unit

CN114792610BCN 114792610 BCN114792610 BCN 114792610BCN-114792610-B

Abstract

The application provides a power supply system and a switch unit, wherein the power supply system comprises a switch, the switch comprises a switch unit and an operating mechanism, the switch unit comprises an arc extinguishing function piece, a fixed contact assembly, a moving contact and a first magnet assembly, the arc extinguishing function piece is arranged in the arc extinguishing function piece, the moving contact is arranged in the arc extinguishing function piece and can move relative to the fixed contact assembly, when the operating mechanism receives a brake separating signal, the switch unit is controlled to be disconnected so as to separate the moving contact from the fixed contact assembly, an electric arc is formed between the moving contact and the fixed contact assembly in the process of separating the moving contact from the fixed contact assembly, at least part of magnetic induction lines of the first magnet assembly are intersected with the current direction of the electric arc so as to drive the electric arc to move towards the arc extinguishing function piece, the first magnet assembly comprises a first magnet and a second magnet which are arranged at intervals, the first magnet and the second magnet are jointly used for increasing the movement path of the electric arc and increasing the contact area of the electric arc and the arc extinguishing function piece, and improving the cooling effect of the arc extinguishing function piece on the electric arc.

Inventors

  • SUN JISHENG
  • ZHANG XIUFENG
  • ZHAO FUGAO

Assignees

  • 华为数字能源技术有限公司

Dates

Publication Date
20260512
Application Date
20220402

Claims (15)

  1. 1. A power supply system comprising a control unit, a switch, a dc source and a power variation unit, the switch being electrically connected between the dc source and the power variation unit, the control unit being configured to send a switching-off signal to the switch when the dc source or the power variation unit fails, the switch comprising a switching unit and an operating mechanism, the operating mechanism being configured to receive the switching-off signal and to control the switching unit to be opened or closed, the switching unit comprising: An arc extinguishing function piece; The fixed contact assembly is positioned in the arc extinguishing functional piece and comprises a first fixed contact and a second fixed contact which are arranged at intervals; The moving contact is positioned in the arc extinguishing function piece and can move relative to the fixed contact assembly, the operating mechanism controls the switch unit to be opened when receiving the switching-off signal so as to separate the moving contact from the fixed contact assembly, an electric arc is formed between the moving contact and the fixed contact assembly in the separation process of the moving contact and the fixed contact assembly, the moving contact comprises a first end and a second end which are oppositely arranged, the operating mechanism can control the moving contact to rotate, and when the switch unit is in the closed state, the first end and the second end are respectively connected with the first fixed contact and the second fixed contact so as to conduct current; The first magnet assembly, the direction of at least part of magnetic induction lines of the first magnet assembly intersects with the current direction of the electric arc so as to drive the electric arc to move towards the arc extinguishing function piece, the first magnet assembly comprises a first magnet and a second magnet which are arranged at intervals, the first magnet and the second magnet are jointly used for increasing the movement path of the electric arc and increasing the contact area between the electric arc and the arc extinguishing function piece, the cooling effect of the arc extinguishing function piece on the electric arc is improved, When the switch unit is in the off state, the movable contact rotates to enable the first end to be separated from the first fixed contact, the second end to be separated from the second fixed contact so as to cut off current, a first arc is formed between the first end and the first fixed contact, the first magnet and the second magnet are located on the same side of the arc extinguishing function piece along the radial direction of the arc extinguishing function piece, the first magnet and the second magnet are arranged at intervals along the radial direction or the circumferential direction of the arc extinguishing function piece, the magnetic pole end of the first magnet and the magnetic pole end of the second magnet are close to the first arc, the first magnet and the second magnet are located on one side of the first arc, and the first magnet and the second magnet are used for increasing the movement path of the first arc and increasing the contact area of the first arc and the arc extinguishing function piece.
  2. 2. The power supply system of claim 1, wherein the first magnet and the second magnet are co-aligned to drive the first arc to both move toward the same side of the arc extinguishing function and to increase a path of movement of the first arc and to increase a contact area of the first arc with the arc extinguishing function.
  3. 3. The power supply system of claim 2, wherein the first magnet assembly further comprises a third magnet, the first magnet, the second magnet, and the third magnet all being co-aligned to drive the first arc to all move toward a same side of the arc extinguishing function and to increase a path of movement of the first arc and to increase a contact area of the first arc with the arc extinguishing function.
  4. 4. The power supply system of claim 1, wherein the arc extinguishing function comprises a first sub-function and a second sub-function disposed opposite to each other, the first magnet and the second magnet being arranged in opposite directions, the first magnet being configured to drive a portion of the first arc toward the first sub-function, the second magnet being configured to drive a portion of the first arc toward the second sub-function to increase a path of movement of the first arc, the first magnet being configured to increase a contact area of the first arc with the first sub-function, the second magnet being configured to increase a contact area of the first arc with the second sub-function, such that both the first sub-function and the second sub-function are configured to cool the first arc.
  5. 5. The power supply system of claim 4, wherein the first magnet assembly further comprises a third magnet, the first magnet, the second magnet, and the third magnet being arranged in sequence, the third magnet being arranged in opposition to the second magnet, the third magnet being configured to drive a portion of the first arc toward the first sub-feature to increase a path of movement of the first arc, the third magnet being configured to increase a contact area of the first arc with the first sub-feature to increase a cooling effect of the first sub-feature on the first arc.
  6. 6. The power supply system of claim 4, wherein the first magnet assembly further comprises a third magnet, the first magnet, the second magnet, and the third magnet are sequentially arranged, the second magnet is arranged in a same direction as the third magnet, the third magnet is used for driving a part of the first arc to move towards the second sub-function to increase a movement path of the first arc, and the third magnet is used for increasing a contact area of the first arc and the second sub-function to improve a cooling effect of the second sub-function on the first arc.
  7. 7. The power supply system of claim 4, wherein the first magnet assembly further comprises a third magnet positioned between the first magnet and the second magnet, the third magnet being co-aligned with the first magnet, the third magnet being configured to drive a portion of the first arc toward the first sub-function to increase a path of movement of the first arc, the third magnet being configured to increase a contact area of the first arc with the first sub-function to increase a cooling effect of the first sub-function on the first arc.
  8. 8. The power supply system of claim 1, wherein the direction of extension of the first magnet intersects the direction of extension of the second magnet such that the first magnet assembly drives the first arc more and is capable of reducing the volume of the switch.
  9. 9. The power supply system of claim 1, wherein the first magnet extends in the same direction as the second magnet, and wherein the direction of the magnetic induction lines inside the first magnet and the direction of the magnetic induction lines inside the second magnet intersect to cause the first arc to be proximate to the arc extinguishing function.
  10. 10. The power supply system of claim 1, wherein the first magnet assembly comprises four or more magnets, the four or more magnets comprise the first magnet and the second magnet, the four or more magnets are sequentially arranged, and the directions of magnetic induction lines of the magnets are sequentially different by a preset angle so as to improve the cooling effect on the first arc.
  11. 11. The power supply system of any one of claims 1-10, wherein the switch unit further comprises a second magnet assembly, wherein a second arc is formed between the second end and the second stationary contact when the switch unit is in the open state; the first magnet and the second magnet are positioned on one side of the first arc away from the second arc, and the direction of at least part of magnetic induction lines of the second magnet assembly is intersected with the current direction of the second arc so as to drive the second arc to move; The second magnet assembly further comprises a fourth magnet and a fifth magnet which are arranged at intervals, the fourth magnet and the fifth magnet are located at one side, far away from the first arc, of the second arc, the fourth magnet and the fifth magnet are jointly used for increasing the movement path of the second arc and the contact area between the second arc and the arc extinguishing function piece, so that the second arc is cooled, the cooling effect of the second arc is improved, and the breaking capacity of the switch unit is improved.
  12. 12. The power supply system of claim 11, wherein the first magnet assembly and the second magnet assembly are positioned on both sides of the arc extinguishing function along a radial direction of the arc extinguishing function, and the first magnet assembly is disposed adjacent to the first stationary contact for enhancing a cooling effect on the first arc, and the second magnet assembly is disposed adjacent to the second stationary contact for enhancing a cooling effect on the second arc.
  13. 13. The power supply system of claim 11, wherein the arc extinguishing function includes oppositely disposed first and second sub-functions, the first and second magnet assemblies being located on a side of the first sub-function remote from the second sub-function, and the first magnet assembly being disposed adjacent the first stationary contact and the second magnet assembly being disposed adjacent the second stationary contact for reducing a size of the switching unit.
  14. 14. The power supply system of any of claims 1-10, 12-13, wherein the arc suppressing feature comprises at least one of an insulating housing or a metal grid set.
  15. 15. A switch unit, wherein the switch unit is applied to a switch, the switch includes a knob, a switch unit, and an operating mechanism connected between the knob and the switch unit, the knob can control the switch unit to be opened or closed through the operating mechanism, the switch unit includes: An arc extinguishing function piece; The fixed contact assembly is positioned in the arc extinguishing functional piece and comprises a first fixed contact and a second fixed contact which are arranged at intervals; The movable contact is positioned in the arc extinguishing function piece and can move relative to the fixed contact assembly, when the switch unit is in the closed state, the movable contact is connected and conducted with the fixed contact assembly, when the switch unit is in the open state, the movable contact is separated from the fixed contact assembly, an electric arc is formed between the movable contact and the fixed contact assembly in the separation process, the movable contact comprises a first end and a second end which are oppositely arranged, the operating mechanism can control the movable contact to rotate, and when the switch unit is in the closed state, the first end and the second end are respectively connected with the first fixed contact and the second fixed contact so as to conduct current; The first magnet assembly, the direction of at least part of magnetic induction lines of the first magnet assembly intersects with the current direction of the electric arc so as to drive the electric arc to move towards the arc extinguishing function piece, the first magnet assembly comprises a first magnet and a second magnet which are arranged at intervals, the first magnet and the second magnet are jointly used for increasing the movement path of the electric arc and increasing the contact area between the electric arc and the arc extinguishing function piece, the cooling effect of the arc extinguishing function piece on the electric arc is improved, When the switch unit is in the off state, the movable contact rotates to enable the first end to be separated from the first fixed contact, the second end to be separated from the second fixed contact so as to cut off current, a first arc is formed between the first end and the first fixed contact, the first magnet and the second magnet are located on the same side of the arc extinguishing function piece along the radial direction of the arc extinguishing function piece, the first magnet and the second magnet are arranged at intervals along the radial direction or the circumferential direction of the arc extinguishing function piece, the magnetic pole end of the first magnet and the magnetic pole end of the second magnet are close to the first arc, the first magnet and the second magnet are located on one side of the first arc, and the first magnet and the second magnet are used for increasing the movement path of the first arc and increasing the contact area of the first arc and the arc extinguishing function piece.

Description

Power supply system and switch unit Technical Field The present application relates to the field of switching technologies, and in particular, to a power supply system and a switching unit. Background A switch is an electronic component used to switch on or off current in one or more circuits, and is commonly used in power systems for control and protection, and in turn, generates an arc during the process of switching off the current. The generation of the electric arc prolongs the turn-off time of a circuit, and the electric arc has high temperature, so that the switch is easy to deform and melt, the safe operation of a power supply system is endangered, and casualties and great loss of property are caused. In the use process of the switch, the electric arc needs to be cooled to reduce the harm caused by the electric arc, but in the prior art, the cooling effect on the electric arc is poor, and particularly the electric arc at a higher temperature cannot be cooled effectively. Disclosure of Invention The application provides a power supply system with a switch having a good breaking capability. In a first aspect, the power supply system comprises a control unit, a switch, a direct current source and a power change unit, wherein the switch is electrically connected between the direct current source and the power change unit, the control unit is used for sending a switching-off signal to the switch when the direct current source or the power change unit fails, the switch comprises a switch unit and an operating mechanism, the operating mechanism is used for receiving the switching-off signal and controlling the switch unit to be opened or closed, the switch unit comprises an arc extinguishing function piece, a fixed contact assembly, a moving contact and a first magnet assembly, the fixed contact assembly is positioned inside the arc extinguishing function piece, the moving contact is positioned inside the arc extinguishing function piece and can move relative to the fixed contact assembly, the operating mechanism is used for controlling the switch unit to be opened when the switching-off signal is received, so that the moving contact is separated from the fixed contact assembly, in the process of separating the moving contact from the fixed contact assembly, at least part of the first magnet assembly is used for forming a direction of a line-sensing current, the moving contact and the first magnet assembly are positioned inside the arc extinguishing function piece, the moving contact assembly is positioned inside the arc extinguishing function piece, the moving contact and the moving magnet assembly is used for cooling the arc, and the arc moving magnet assembly is used for increasing the arc cooling and the arc-extinguishing function. The arc is stretched by the magnetic field force of the first magnet and the second magnet, so that the bending degree of the arc is larger, the arc is stretched to be more elongated, and the cooling of the arc is facilitated, on the other hand, the arc is close to the two ends of the fixed contact assembly and the moving contact and is a part with higher temperature in the arc, and the two magnets, namely the first magnet and the second magnet, are arranged, and the areas with the largest magnetic induction linear density in the first magnet and the second magnet are respectively distributed on the side close to the fixed contact assembly and the side close to the moving contact, so that the two ends of the arc close to the fixed contact assembly and the moving contact are positioned at the position with larger magnetic field strength, the magnetic field force of the arc is larger at the part with higher temperature, the movement path of the arc is longer, the cooling efficiency of the arc is improved, on the other hand, the arc is moved to the arc extinguishing function piece through the magnetic field force, the arc extinguishing function piece is used for carrying out secondary cooling on the arc, the breaking capacity of the switch is improved to the maximum, and the function piece has simple structure and lower cost. In one possible implementation manner, the fixed contact assembly comprises a first fixed contact and a second fixed contact which are arranged at intervals, the moving contact comprises a first end and a second end which are arranged oppositely, the operating mechanism can control the moving contact to rotate, when the switch unit is in the closed state, the first end and the second end are respectively connected with the first fixed contact and the second fixed contact so as to conduct current, when the switch unit is in the open state, the moving contact rotates so as to separate the first end from the first fixed contact and separate the second end from the second fixed contact so as to cut off current, a first arc is formed between the first end and the first fixed contact, and the first magnet and the second magnet are positioned on one side of the f