Arc extinguishing structure of direct-current isolating switch
By using an elastic spacer structure in the DC isolating switch to cut off the arc, the problem of excessive arc length and difficulty in cutting off when the DC arc is broken is solved, and effective arc cutoff is achieved when the dynamic contact and the static contact are broken, reducing the contact The point burns to ensure the normal operation of the switch.
Patent Information
- Application Number
- CN202420018119.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-03
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-03
AI Technical Summary
When the DC arc is broken, due to the existence of critical load current, the arc length is long and not easy to pull toward the arc extinguishing chamber, resulting in burning and damage to the contacts, affecting the normal operation of the switch.
The elastic spacer structure is adopted. When the moving contact and the static contact are separated, the free end of the spacer extends into between the two to cut off the arc, and the arc entry and segmentation effect is enhanced by the arc-induced plate and lead angle design.
Effectively cut off small arcs, reduce contact burns, and ensure reliable operation of the switch.
Smart Images
Figure CN222190521U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of direct current isolating switches, and in particular to an arc extinguishing structure of a direct current isolating switch. Background Art
[0002] At present, DC switches mainly use grids to divide the arc for arc extinguishing, that is, the contacts of multi-pole products are connected in series and the contacts are disconnected at the same time, so that the high DC voltage is evenly distributed on the contacts in series, reducing the arc voltage of each contact. In addition, some products use magnetic blowing or air blowing to pull the arc to the arc extinguishing chamber, and cut off the arc and cool it through arc extinguishing grids. In theory, due to the electromagnetic field force F=BIL on the DC arc, the greater the current, the greater the electromagnetic field force, which is conducive to pulling the arc to the arc extinguishing chamber, and the smaller the electromagnetic field force, it is not conducive to pulling the arc to the arc extinguishing chamber.
[0003] Since DC arcs do not have a zero point like AC arcs, it is difficult to extinguish the arc when breaking the circuit. In power generation, the current is not stable. When a small current passes through, due to the existence of critical load current, the critical length of the DC arc is significantly longer than that of the AC arc, and the arc is small and not easy to be pulled into the arc extinguishing chamber. Even if the arc can be successfully broken at the beginning, after multiple openings and closings, it is very easy to cause contact burnout and make the switch unable to work normally. Summary of the invention
[0004] In order to solve the above problems, the present disclosure provides an arc extinguishing structure of a DC isolating switch.
[0005] Specifically, the technical solution of the present disclosure is:
[0006] A DC disconnector arc extinguishing structure comprises a static contact, a moving contact and an arc extinguishing chamber, wherein the static contact and the moving contact are located below the arc extinguishing chamber, and the arc extinguishing chamber has an opening for the power arc to enter on the side facing the static contact and the moving contact. The arc extinguishing structure also comprises a partition, one end of which is located in the arc extinguishing chamber, and the other end is bridged on the moving contact, the end of the partition bridged on the moving contact is the free end of the partition, and the partition is elastic. When the moving contact and the static contact are closed, the free end of the partition is located between the arc extinguishing chamber opening and the moving contact, and when the moving contact and the static contact are disconnected, the free end of the partition extends between the moving contact and the static contact to cut off the arc.
[0007] In one embodiment, an opening is provided in the middle of the partition, and a plurality of arc-striking plates and a lead angle are arranged in sequence in the arc extinguishing chamber. The lead angle is provided on the side of the plurality of arc-striking plates farther from the static contact, and a groove is provided on the lower edge of the arc-striking plate. The upper edge of the opening is not higher than the bottom of the groove, and the lower edge of the opening is not lower than the lead angle.
[0008] In one embodiment, a slot is provided inside the arc extinguishing chamber, and a pin facing the static contact is provided on the partition corresponding to the slot, and the pin is inserted into the slot.
[0009] In one embodiment, a plurality of arc-striking plates arranged in sequence are provided in the arc-extinguishing chamber, and a spacer is provided between two adjacent arc-striking plates which are far from the static contact.
[0010] In one embodiment, 18 arc-striking plates are arranged in sequence in the arc-extinguishing chamber, the arc-striking plate closest to the stationary contact is the first arc-striking plate, and the spacer is arranged between the 11th arc-striking plate and the 12th arc-striking plate.
[0011] In one embodiment, the partition gradually widens from the middle thereof toward a direction away from the arc extinguishing chamber.
[0012] Beneficial technical effects of the present disclosure:
[0013] The arc extinguishing structure of the DC disconnector provided by the present disclosure realizes effective cutting off of a small arc generated when a moving contact and a stationary contact are disconnected by means of an elastic spacer. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a structural diagram of an arc extinguishing chamber, an arc striking piece and a spacer according to an embodiment of the present disclosure;
[0015] Figure 2 for Figure 1 The structural diagram of the assembly method of the partition in the arc extinguishing chamber is shown;
[0016] Figure 3 It is a schematic diagram of the position and shape of the spacer when the moving contact and the stationary contact of the present invention are closed;
[0017] Figure 4 It is a schematic diagram of the position and shape of the spacer when the moving contact and the static contact of the present invention are disconnected;
[0018] Figure 5 for Figure 1 Structural diagram showing the relationship between the spacer, the lead angle and the arc-starting plate. DETAILED DESCRIPTION
[0019] The present disclosure is further described in detail below in conjunction with the accompanying drawings and a specific embodiment.
[0020] like Figures 1 to 4 As shown, an arc extinguishing structure of a DC disconnector includes a stationary contact 1, a moving contact 2, an arc extinguishing chamber 3 and a partition 4. The stationary contact 1 and the moving contact 2 are located below the arc extinguishing chamber 3. The arc extinguishing chamber 3 has an opening 31 for the power arc to enter on the side facing the stationary contact 1 and the moving contact 2. One end of the partition 4 is located in the arc extinguishing chamber 3, and the other end is mounted on the moving contact 2. The end of the partition 4 mounted on the moving contact 2 is the free end of the partition 4. The partition 4 is elastic. Figure 3 When the moving contact 2 and the stationary contact 1 are closed, the free end of the partition 4 is located between the opening 31 of the arc extinguishing chamber 3 and the moving contact 2, see Figure 4, when the moving contact 2 is disconnected from the stationary contact 1, the free end of the diaphragm 4 extends between the moving contact 2 and the stationary contact 1 to cut off the small arc. Specifically, in the process from closing to disconnecting of the moving contact 2 and the stationary contact 1, the free end of the diaphragm 4 is gradually flattened due to the elastic restoring force of the diaphragm 4, extends downward, and rotates in the direction away from the stationary contact 1, thereby completing the cutting of the small arc. In this embodiment, when the moving contact 2 is disconnected from the stationary contact 1, the free end of the diaphragm 4 extends in the direction away from the arc extinguishing chamber 3 to a position exceeding the entire contact surface of the moving contact 2, ensuring that the arc is cut off.
[0021] Figure 2 The arc extinguishing chamber 3 is hidden except for the arc baffles on both sides of the opening 31, see Figure 2 In this embodiment, a slot 32 is provided inside the arc extinguishing chamber 3, and a pin 42 facing the static contact 1 is provided on the partition 4 corresponding to the slot 32. The pin 42 is inserted into the slot 32, and the edge of the partition 4 closest to the inside of the arc extinguishing chamber 3 abuts against the arc isolation plate 5 in the arc extinguishing chamber 3. A plurality of arc-striking sheets 6 arranged in sequence are provided in the arc extinguishing chamber 3, and the partition 4 is provided between two adjacent arc-striking sheets 6 far from the static contact 1, so that when the moving and static contacts are closed, the partition 4 will not affect the reliable closing of the moving and static contacts, and when the moving and static contacts are disconnected, the partition 4 can separate the moving and static contacts in time, solving the problem that the critical load current cannot be cut off. The limiting of the slot 32 on the pin 42 and the limiting of the arc isolation plate 5 on the upper edge of the partition 4 can prevent the partition 4 from shifting, realize the reliable assembly of the partition 4, and the assembly process is relatively simple; in other embodiments, other limiting structures can also be provided to realize the assembly of the partition 4. The arc-isolating plate 5 is evenly provided with circular holes for exhaust, which can increase the pressure difference between the inside and outside of the arc-extinguishing chamber 3, facilitate the discharge of high-pressure gas to the outside of the arc-extinguishing chamber 3, and facilitate the arc to enter the arc-extinguishing chamber 3.
[0022] See also Figure 1 The arc extinguishing chamber 3 is composed of two shells. Figure 3 and 4 A flap of the arc extinguishing chamber 3 shell is hidden, exposing the components inside the arc extinguishing chamber 3, see Figure 3 Or 4, in this embodiment, 18 arc-striking pieces 6 are arranged in sequence in the arc-extinguishing chamber 3, the arc-striking piece 6 closest to the stationary contact 1 is the first arc-striking piece, and the spacer 4 is arranged between the 11th arc-striking piece and the 12th arc-striking piece. In other embodiments, the number of arc-striking pieces 6 and the position of the spacer 4 can also be appropriately increased or decreased.
[0023] In this embodiment, an opening 41 is provided in the middle of the partition 4, and a large arc can enter the arc extinguishing chamber 3 from the opening 41. The arc cannot be cut due to the obstruction of the partition 4, so that the arc enters the arc extinguishing chamber 3 and can form a complete circuit. The arc-starting plates 6 divide the voltage layer by layer to finally achieve the arc extinguishing effect.
[0024] In this embodiment, see Figure 1 and5 A groove 61 is provided at the lower edge of the arc striking piece 6 to distort the magnetic flux path generated by the arc current, thereby generating an attraction force that pulls the arc toward the arc striking piece 6, so that the arc quickly enters the arc extinguishing chamber 3 and is divided into series short arcs.
[0025] The opening 41 should not be too large to avoid affecting the strength of the spacer 4. In this embodiment, the upper edge of the opening 41 is not higher than the bottom of the groove 61, and the lower edge of the opening 41 is not lower than the lead angle 7.
[0026] In this embodiment, the spacer 4 is made of V-0 flame retardant grade plastic, gradually widens from the middle toward the direction away from the arc extinguishing chamber 3, and has excellent elasticity, arc cutting performance and flame retardant performance.
[0027] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. It should be noted that any modification, equivalent replacement, improvement, etc. made by a person skilled in the art within the spirit and principle of the present disclosure after reading this specification should be included in the protection scope of the present disclosure.
Claims
1. An arc extinguishing structure of a DC disconnector, comprising a stationary contact, a moving contact and an arc extinguishing chamber, wherein the stationary contact and the moving contact are located below the arc extinguishing chamber, and the arc extinguishing chamber has an opening for the power arc to enter on one side of the stationary contact and the moving contact, Features: It also includes a partition, one end of which is located in the arc extinguishing chamber, and the other end is mounted on the moving contact. The end of the partition mounted on the moving contact is the free end of the partition. The partition is elastic. When the moving contact and the static contact are closed, the free end of the partition is located between the arc extinguishing chamber opening and the moving contact. When the moving contact and the static contact are disconnected, the free end of the partition extends between the moving contact and the static contact to cut off the arc.
2. The arc extinguishing structure of the DC isolating switch according to claim 1, Features: An opening is provided in the middle of the partition, and a plurality of arc-striking plates and a lead angle are arranged in sequence in the arc extinguishing chamber. The lead angle is provided on the side of the plurality of arc-striking plates farther from the static contact, and a groove is provided on the lower edge of the arc-striking plate. The upper edge of the opening is not higher than the bottom of the groove, and the lower edge of the opening is not lower than the lead angle.
3. The arc extinguishing structure of the DC isolating switch according to claim 1, Features: A slot is provided inside the arc extinguishing chamber, and a pin facing the static contact is provided on the partition corresponding to the slot, and the pin is inserted into the slot.
4. The arc extinguishing structure of the DC isolating switch according to claim 1 or 3, Features: The arc extinguishing chamber is provided with a plurality of arc striking pieces arranged in sequence, and a spacer is provided between two adjacent arc striking pieces which are far from the static contact.
5. The arc extinguishing structure of the DC isolating switch according to claim 4, Features: The arc extinguishing chamber is provided with 18 arc-striking pieces arranged in sequence, the arc-striking piece closest to the stationary contact is the first arc-striking piece, and the spacer is provided between the 11th arc-striking piece and the 12th arc-striking piece.
6. The arc extinguishing structure of the DC isolating switch according to claim 1, Features: The partition gradually widens from the middle thereof toward a direction away from the arc extinguishing chamber.