Vacuum arc extinguishing circuit breaker
By installing a shield and conductive mechanism in the vacuum arc-extinguishing circuit breaker, the electric arc is led to the arc-extinguishing medium for consumption, thus solving the problem of damage to the contacts caused by the vacuum arc and achieving efficient protection of the circuit breaker.
Patent Information
- Application Number
- CN202422904352.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing vacuum arc-extinguishing circuit breakers are prone to generating vacuum arcs when disconnected from a vacuum, which can lead to burn-out of the contact surfaces.
A vacuum is drawn inside the insulating shell, and a shielding cover is installed outside the stationary and moving contacts. A solid arc-extinguishing medium and a conductive mechanism are set up, including a fixed conductive rod and a movable conductive tube. The movable conductive tube is driven to extend and slide by a cable, so that the arc is led to the arc-extinguishing medium for consumption.
It effectively prevents electric arc damage to the insulation shell and contact surface, avoids vacuum arcing, reduces maintenance costs, and improves the reliability of the circuit breaker.
Smart Images
Figure CN223566508U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a vacuum arc extinguishing technology field especially relates to a vacuum arc extinguishing circuit breaker. BACKGROUND
[0002] When the circuit breaker is disconnected, arc is generally generated, and the arc is a kind of gas discharge phenomenon, which can be harmful to cable and circuit breaker itself.Therefore, the circuit breaker often needs to have arc extinguishing function, especially on some high-voltage lines.
[0003] Among them, the most common arc extinguishing methods include oil-cooled arc extinguishing, gas-blast arc extinguishing, metal grid arc extinguishing and vacuum arc extinguishing, etc.Vacuum arc extinguishing has the advantages of fast speed, small noise, small loss to contact, easy maintenance and low cost, and is based on high vacuum degree medium, high insulation strength, high diffusion speed of arc generation and the effect of transverse magnetic field.
[0004] However, when the contact of the general vacuum arc extinguishing circuit breaker is separated in vacuum, the electric contact surface area rapidly decreases, the current is contracted to a certain point or a few points where the contact is just separated, the resistance between electrodes sharply increases, the temperature rapidly rises, resulting in intense field emission and breakdown of gap, and vacuum arc is generated.The vacuum arc is also easy to hit the contact, causing the contact surface to appear burnout and other damages.
[0005] Therefore, it is worth studying and improving to avoid the damage to the contact surface by leading away the vacuum arc. CONTENT OF THE UTILITY MODEL
[0006] Therefore, the utility model provides a vacuum arc extinguishing circuit breaker, which can solve the problem that the vacuum arc extinguishing circuit breaker in the prior art is easy to generate vacuum arc when the contact is separated in vacuum, thereby causing damage to the contact surface.
[0007] In order to achieve the above purpose, the utility model provides a vacuum arc extinguishing circuit breaker, which comprises an insulating shell and static contacts and moving contacts arranged in the insulating shell, the insulating shell is vacuumized, and the vacuum arc extinguishing circuit breaker further comprises:
[0008] A shielding cover is sleeved outside the static contacts and the moving contacts, an accessory part is fixedly connected to the outer side of the shielding cover, and an arc extinguishing medium is arranged in the accessory part;
[0009] A fixed conductive rod is arranged in the accessory part, the fixed conductive rod is connected with the arc extinguishing medium, and a movable conductive pipe is further slidably connected to the fixed conductive rod, the movable conductive pipe is slidably connected in the accessory part, and one end of the movable conductive pipe penetrates through the shielding cover and is located in the shielding cover.
[0010] Further, the static contact is fixedly connected to the inner end of a fixed rod, the fixed rod is fixedly connected to the insulating shell, the movable contact is fixedly connected to the inner end of a movable rod, and the movable rod is slidably connected to the insulating shell.
[0011] Further, the arc-extinguishing medium in the accessory part is a solid arc-extinguishing medium.
[0012] Further, the movable conductive tube is closed at one end in the shielding cover, the other end of the movable conductive tube is open, the movable conductive tube is sleeved on the fixed conductive rod through the open end, and the end of the fixed conductive rod is connected to the arc-extinguishing medium through a wire.
[0013] Further, the movable rod below the movable contact is further fixedly connected with a connecting plate, a sliding plate is arranged below the connecting plate, and the sliding plate is connected to the movable conductive tube through a cable.
[0014] Further, the shielding cover and the accessory part are provided with a movable groove, the sliding plate is slidably connected to the movable groove, and a reset spring one is further arranged in the movable groove.
[0015] Further, the bottom of the sliding plate is further fixedly connected with a limiting rod, and a limiting groove is further arranged in the shielding cover and the accessory part, and the limiting rod is slidably connected to the limiting groove.
[0016] Further, the movable conductive tube is further provided with a protrusion, the cable is connected to the protrusion, a stopper fixedly connected to the shielding cover is further arranged outside the protrusion, and a reset spring two is further arranged between the stopper and the protrusion.
[0017] The utility model discloses the beneficial effect that 1, in the insulating shell vacuumization is used for arc extinguishing, and the shielding cover is set on the outside of static contact and movable contact to protect the insulating shell, prevents static contact and movable contact from separating and produces arc damage to the insulating shell. In order to prevent static contact and movable contact from separating and produces arc damage to the contact itself, set up arc-extinguishing medium and conductive mechanism, are used for arc is led to arc-extinguishing medium and is consumed, avoid vacuum arc and hit on the contact, make the contact surface burn loss.
[0018] 2, the conductive mechanism is composed of fixed conductive rod and movable conductive tube, and the movable conductive tube can be telescopic and slide, after static contact and movable contact separate, the movable conductive tube can be elongated and intervene between static contact and movable contact, and then arc is led to arc-extinguishing medium and is consumed better and more smoothly.
[0019] 3. The telescopic sliding of the movable conducting pipe is driven by the cable, and the other end of the cable is connected to the sliding plate, which is located at the bottom of the connecting plate fixedly connected to the movable rod, so that when the movable rod drives the moving contact to separate from the static contact, the sliding plate is driven to slide downward, and then the movable conducting pipe is driven to slide out by the cable, and is intervened between the static contact and the moving contact. In addition, the reset spring I and the reset spring II can drive the sliding plate and the movable conducting pipe to reset after the static contact and the moving contact are reconnected. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical scheme of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings described below are only the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.
[0021] Figure 1 It is the overall structure principle diagram of the device of the present application.
[0022] Figure 2 It is the internal structure diagram of the insulating shell in the device of the present application.
[0023] Figure 3 It is the internal structure diagram of the device of the present application.
[0024] Figure 4 It is Figure 3 It is the enlarged view of part A in the figure.
[0025] Figure 5 It is Figure 3 It is the enlarged view of part B in the figure.
[0026] In the figure, the mark is:
[0027] 101, insulating shell, 102, fixed rod, 103, movable rod, 104, shield, 105, accessory part, 106, static contact, 107, moving contact, 108, connecting plate, 109, arc extinguishing medium, 110, sliding plate, 111, limiting rod, 112, limiting groove, 113, movable slot, 114, reset spring I, 115, cable, 116, steering wheel, 117, movable conducting pipe, 118, fixed conducting rod, 119, wire, 120, stop block, 121, reset spring II. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the present application more clear and obvious, the following will further illustrate the present application in combination with specific embodiments.
[0029] It should be noted that, unless otherwise defined, technical or scientific terms used in the present application should be understood as their common meanings to those skilled in the art to which the present application belongs. The terms "first", "second" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "including" or "containing" and similar words mean that the elements or objects listed before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The terms "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute position of the described object changes.
[0030] The first aspect of the present application, as shown in Figure 1 , Figure 2 and Figure 3 , in order to protect the circuit breaker from arc damage, a vacuum arc extinguishing mechanism is provided, specifically, the insulating shell 101 of the circuit breaker is evacuated, so that the static contact 106 and the moving contact 107 provided in the insulating shell 101 are in a vacuum environment.
[0031] In addition, the shielding cover 104 is fixedly connected in the insulating shell 101, the shielding cover 104 is sleeved outside the static contact 106 and the moving contact 107, the outer side of the shielding cover 104 is fixedly connected with the accessory part 105, and the arc extinguishing medium 109 is arranged in the accessory part 105.
[0032] Preferably, the shielding cover 104 is made of metal material, and the insulating shell 101 is made of ceramic material or glass material, and the arc extinguishing medium 109 in the accessory part 105 is preferably a solid arc extinguishing medium.
[0033] The static contact 106 is fixedly connected to the inner end of the fixed rod 102, the fixed rod 102 is fixedly connected with the insulating shell 101, and the moving contact 107 is fixedly connected to the inner end of the movable rod 103, and the movable rod 103 is slidingly connected with the insulating shell 101.
[0034] The vacuum in the insulating shell 101 is used for arc extinguishing, and the shielding cover 104 is sleeved outside the static contact 106 and the moving contact 107 to protect the insulating shell 101, so that the arc generated when the static contact 106 and the moving contact 107 separate does not damage the insulating shell 101. In addition, in order to prevent the arc generated when the static contact 106 and the moving contact 107 separate from damaging the contact itself, the arc extinguishing medium 109 and the conductive mechanism are arranged to guide the arc into the arc extinguishing medium 109 to consume it, avoiding the vacuum arc striking on the contact, so that the contact surface is not burned.
[0035] The second aspect of the utility model, as shown in Figure 3 、 Figure 4 and Figure 5 Indicated, in order to prevent the arc produced when the static contact 106 and the moving contact 107 separate from damaging the contact itself, set up the conductive mechanism, and the conductive mechanism is composed of fixed conductive rod 118 and movable conductive pipe 117.Fixed conductive rod 118 is fixedly connected in the accessory part 105, and fixed conductive rod 118 is connected with arc extinguishing medium 109, and movable conductive pipe 117 is slidably connected on fixed conductive rod 118, and movable conductive pipe 117 is also slidably connected in the accessory part 105, and movable conductive pipe 117 is located below the static contact 106, and one end thereof passes through the shield cover 104 and is located in the shield cover 104.
[0036] Preferably, the end of movable conductive pipe 117 in the shield cover 104 is closed, and the other end of movable conductive pipe 117 is open, and movable conductive pipe 117 is sleeved on fixed conductive rod 118 through the open end, and the end of fixed conductive rod 118 is connected with arc extinguishing medium 109 through wire 119.
[0037] Movable conductive pipe 117 will automatically extend when the telescopic sliding moving contact 107 separates from the static contact 106, and intervene between the static contact 106 and the moving contact 107.Specifically, the connecting plate 108 is also fixedly connected on the movable rod 103 below the moving contact 107, the sliding plate 110 is provided below the connecting plate 108, the sliding plate 110 is connected with movable conductive pipe 117 through the cable 115, and the shield cover 104 and the accessory part 105 are provided with movable slot 113, the sliding plate 110 is slidably connected in the movable slot 113, and reset spring one 114 is also provided in the movable slot 113, and the two ends of reset spring one 114 are connected with the sliding plate 110 and the bottom of the movable slot 113 respectively.
[0038] Preferably, the bottom of the sliding plate 110 is also fixedly connected with the limiting rod 111, and the limiting slot 112 is also provided in the shield cover 104 and the accessory part 105, and the limiting rod 111 is slidably connected in the limiting slot 112.Limiting rod 111 and limiting slot 112 can ensure the stability of the sliding plate 110 when sliding.
[0039] And movable conductive pipe 117 is also provided with a protrusion, and the cable 115 is connected to the protrusion, and the protrusion is also provided with a stop block 120 fixedly connected with the shield cover 104, and reset spring two 121 is also connected between the stop block 120 and the protrusion.
[0040] Therefore, when the movable rod 103 drives the moving contact 107 to separate from the static contact 106, the slide plate 110 is driven to slide downward, and then the movable conducting pipe 117 is driven to slide out by the pull cable 115, and is intervened between the static contact 106 and the moving contact 107. Then, the electric arc is better and more smoothly guided to the arc extinguishing medium 109 to be consumed.
[0041] In addition, the reset spring one 114 and the reset spring two 121 can drive the slide plate 110 and the movable conducting pipe 117 to reset after the static contact 106 and the moving contact 107 are reconnected.
[0042] In summary
[0043] 1, vacuum in the insulating shell 101 is used for arc extinguishing, and the shielding cover 104 is sleeved outside the static contact 106 and the moving contact 107 to protect the insulating shell 101 from being damaged by the electric arc generated when the static contact 106 and the moving contact 107 are separated. In addition, in order to prevent the electric arc generated when the static contact 106 and the moving contact 107 are separated from damaging the contact itself, the arc extinguishing medium 109 and the conducting mechanism are arranged to guide the electric arc to the arc extinguishing medium 109 to be consumed, avoiding the vacuum electric arc striking on the contact to cause the contact surface to be burned. The conducting mechanism is composed of the fixed conducting rod 118 and the movable conducting pipe 117, the movable conducting pipe 117 can slide and stretch out, the sliding and stretching out of the movable conducting pipe 117 is driven by the pull cable 115, and the other end of the pull cable 115 is connected to the slide plate 110, the slide plate 110 is located at the bottom of the connecting plate 108 fixedly connected to the movable rod 103, therefore, when the movable rod 103 drives the moving contact 107 to separate from the static contact 106, the slide plate 110 is driven to slide downward, and then the movable conducting pipe 117 is driven to slide out by the pull cable 115, and is intervened between the static contact 106 and the moving contact 107. Then, the electric arc is better and more smoothly guided to the arc extinguishing medium 109 to be consumed. In addition, the reset spring one 114 and the reset spring two 121 can drive the slide plate 110 and the movable conducting pipe 117 to reset after the static contact 106 and the moving contact 107 are reconnected.
[0044] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary, and is not intended to imply that the scope of the utility model includes the claims limited to these examples; under the idea of the utility model, the above embodiments or technical features in different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above. In order to be brief, they are not provided in details.
[0045] The present application is intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any and all such alternations, modifications, equivalents, improvements and the like are intended to be encompassed by the present application.
Claims
1. A vacuum arc-extinguishing circuit breaker, comprising an insulating housing (101) and stationary contacts (106) and moving contacts (107) disposed within the insulating housing (101), wherein the insulating housing (101) is evacuated, characterized in that, The vacuum arc-extinguishing circuit breaker also includes: A shielding cover (104) is sleeved on the outside of the stationary contact (106) and the moving contact (107). An accessory part (105) is fixedly connected to the outside of the shielding cover (104). An arc-extinguishing medium (109) is provided inside the accessory part (105). A fixed conductive rod (118) is provided in the accessory part (105). The fixed conductive rod (118) is connected to the arc extinguishing medium (109). A movable conductive tube (117) is also slidably connected to the fixed conductive rod (118). The movable conductive tube (117) is slidably connected in the accessory part (105) and is located below the stationary contact (106). One end of the movable conductive tube passes through the shield (104) and is located inside the shield (104).
2. The vacuum arc-extinguishing circuit breaker according to claim 1, characterized in that, The stationary contact (106) is fixedly connected to the inner end of the fixed rod (102), the fixed rod (102) is fixedly connected to the insulating shell (101), the moving contact (107) is fixedly connected to the inner end of the movable rod (103), and the movable rod (103) is slidably connected to the insulating shell (101).
3. A vacuum arc-extinguishing circuit breaker according to claim 1, characterized in that, The arc-extinguishing medium (109) in the accessory part (105) is a solid arc-extinguishing medium.
4. A vacuum arc-extinguishing circuit breaker according to claim 1, characterized in that, The movable conductive tube (117) is closed at one end inside the shield (104), and open at the other end. The movable conductive tube (117) is sleeved on the fixed conductive rod (118) through the open end. The end of the fixed conductive rod (118) is connected to the arc extinguishing medium (109) through the wire (119).
5. A vacuum arc-extinguishing circuit breaker according to claim 2, characterized in that, A connecting plate (108) is also fixedly connected to the movable rod (103) below the movable contact (107). A sliding plate (110) is provided below the connecting plate (108). The sliding plate (110) is connected to the movable conductive tube (117) through a cable (115).
6. A vacuum arc-extinguishing circuit breaker according to claim 5, characterized in that, The shield (104) and the accessory (105) are provided with a movable groove (113), the slide plate (110) is slidably connected in the movable groove (113), and a return spring (114) is also provided in the movable groove (113). The two ends of the return spring (114) are respectively connected to the bottom of the slide plate (110) and the movable groove (113).
7. A vacuum arc-extinguishing circuit breaker according to claim 5, characterized in that, The bottom of the slide plate (110) is also fixedly connected to a limiting rod (111), and the shield (104) and the accessory part (105) are also provided with a limiting groove (112), and the limiting rod (111) is slidably connected in the limiting groove (112).
8. A vacuum arc-extinguishing circuit breaker according to claim 5, characterized in that, The movable conductive tube (117) is also provided with a protrusion, the cable (115) is connected to the protrusion, and the outside of the protrusion is also provided with a stop (120) fixedly connected to the shield (104). A second return spring (121) is also connected between the stop (120) and the protrusion.