Contact arc extinguishing system of switch

Abstract

A contact arc extinguishing system of a switch belongs to the technical field of low-voltage apparatuses. Comprising a static contact, a moving contact and an arc extinguish chamber, the arc extinguish chamber is located on one side of the static contact and the static contact, the static contact comprises a conductive block, a static arc contact point and a static main contact point, the static arc contact point and the static main contact point are fixed on the conductive block, and the static arc contact point is located on one side, close to the arc extinguish chamber, of the static main contact point; the circuit breaker is characterized in that the two sides of the static arc contact are provided with insulating parts, and the pair of insulating parts is used for preventing electric arc from moving downwards from the two sides of the static arc contact to the static main contact. The arc extinguishing chamber has the advantages that the arc can quickly enter the arc extinguishing chamber, contact ablation is reduced, the service life is prolonged, energy release is reduced, insulation performance reduction is prevented, safety is improved, arc extinguishing efficiency is improved, and breaking capacity is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical apparatus technical field, concretely relates to a contact arc extinguishing system of switch. BACKGROUND

[0002] As important power distribution equipment, air circuit breaker is connected to power supply network and used for protecting the load under it from damage of fault current. With the development of new energy, circuit breaker is used in more and more occasions, and voltage requirement is continuously improved. New requirements are put forward for existing air circuit breaker.

[0003] The circuit breaker comprises a contact system, which can be closed or separated to realize conduction or disconnection of the circuit breaker. The contact system is arranged in the shell of the circuit breaker, and an arc extinguishing chamber is arranged above the contact system. The arc generated on the contact system enters the arc extinguishing chamber and is extinguished in the arc extinguishing chamber. The contact system usually comprises a moving contact and a static contact. In order to accelerate the speed of the arc entering the arc extinguishing chamber, the moving contact comprises an arc contact piece and a main contact piece, and the arc contact piece has a longer extension length than the main contact piece. Correspondingly, the static contact has a static arc contact point corresponding to the arc contact piece and a static main contact point corresponding to the main contact piece, and the static arc contact point is closer to the arc extinguishing chamber than the static main contact point. In actual application, the arc will be transferred from the static arc contact point to the static main contact point, which is not conducive to the arc entering the arc extinguishing chamber quickly, and even causes disconnection failure. SUMMARY

[0004] The utility model discloses a contact arc extinguishing system of switch, which is characterized in that an insulating piece is arranged on both sides of the static arc contact point to prevent the arc from moving downward from both sides of the static arc contact point to the static main contact point, thereby facilitating the arc entering the arc extinguishing chamber.

[0005] The utility model discloses a contact arc extinguishing system of switch, which is characterized in that an insulating piece is arranged on both sides of the static arc contact point to prevent the arc from moving downward from both sides of the static arc contact point to the static main contact point, thereby facilitating the arc entering the arc extinguishing chamber.

[0006] In one specific embodiment of the utility model, the arc extinguishing chamber comprises a pair of side plates, a plurality of grid fins arranged between the pair of side plates and a pair of gas generating pieces, the grid fins are arranged at intervals, and the gas generating pieces are arranged on the side of the grid fins facing the moving contact and the static contact. The insulating piece comprises an extension part, and the extension part is arranged on the gas generating piece.

[0007] In another specific embodiment of the utility model, the arc extinguishing chamber includes a pair of side plates, a plurality of fins arranged between the pair of side plates, the fins are spaced apart from each other, the insulating piece includes an extension, and the extension is arranged on the side plate.

[0008] In another specific embodiment of the utility model, the insulating piece includes an extension end, a gasket is further arranged on the conductive block, the gasket covers the conductive block, the gasket includes two side portions, the two side portions extend downward, and the extension end is formed by the head of the two side portions.

[0009] In another specific embodiment of the utility model, the insulating piece includes an extension end, the extension end is separately arranged, and the extension end is arranged on the conductive block.

[0010] In another specific embodiment of the utility model, the insulating piece includes an extension and an extension end, a gasket is further arranged on the conductive block, the gasket covers the conductive block, the gasket includes two side portions, the two side portions extend downward, and the extension end is formed by the head of the two side portions; the arc extinguishing chamber includes a pair of side plates, a plurality of fins arranged between the pair of side plates and a pair of gas generating pieces, the fins are spaced apart from each other, the gas generating pieces are arranged on the side of the fins facing the moving contact and the stationary contact, the extension is arranged on the gas generating piece, and the extension end is located between the conductive block and the extension.

[0011] In another specific embodiment of the utility model, the extension of the extension and the two side portions is in clearance fit.

[0012] In another specific embodiment of the utility model, the gas generating piece further includes a wrapping portion, and the wrapping portion is attached to the inner side of the fin leg of the fin.

[0013] In another specific embodiment of the utility model, in the direction facing the outer side of the conductive block, the outer side surface of the insulating piece matches the contact surface of the stationary arc contact for contact fit.

[0014] In another specific embodiment of the utility model, the gas generating piece further includes a protruding block, in the array direction of the fin, the extension is located on the side of the protruding block facing the stationary contact, and the width between the two extensions is greater than the width between the two protruding blocks.

[0015] The utility model discloses a structure, has the beneficial effect that: its through setting up insulator at the both sides of static arc contact, prevent the arc from the both sides of static arc contact and move to static main contact point downward, thereby benefit arc fast into arc extinguishing chamber, reduce contact ablation, prolong life, reduce energy release, prevent insulation performance decline, improve security, improve arc extinguishing efficiency, enhance breaking capacity. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is part explosion schematic drawing of the switch of the utility model;

[0017] Figure 2 It is schematic drawing of static contact installation on the bottom plate of the utility model;

[0018] Figure 3 It is schematic drawing of arc extinguishing chamber of the utility model;

[0019] Figure 4 It is schematic drawing of gas production spare of the utility model;

[0020] Figure 5 It is structural schematic drawing of gas production spare and static contact cooperation of the utility model.

[0021] In the drawing: 1. static contact, 11. conductive block, 111. static arc contact, 112. static main contact point, 12. arc -striking piece, 13. gasket 131. side, 1311. extension end, 2. moving contact, 3. arc extinguishing chamber, 31. side plate, 32. grid piece, 33. gas production spare, 331. wrapping part, 3311. fixed part, 332. lug, 333. extension, 334. fitment, 34. downstream separation assembly, 35. arc extinguishing cover, 4. shell, 41. base, 42. bottom plate. DETAILED DESCRIPTION

[0022] The embodiment of the utility model is described in detail below in combination with the drawings, but the description of the embodiment is not the limitation of the technical scheme, and any formal change but not essential change according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0023] In the following description, the concept of directionality (or directionality) of up, down, left, right, front and back is in the position state of the corresponding drawing, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model. Example 1

[0024] As Figure 1The switch includes a circuit breaker and a disconnector, and the switch includes a stationary contact 1, a movable contact 2, an arc extinguishing chamber 3, and a housing 4. The stationary contact 1 and the movable contact 2 are referred to as a contact system. The housing 4 includes a base 41 and a bottom plate 42. The base 41 and the bottom plate 42 are spliced to form a contact accommodating cavity in the interior thereof, and the stationary contact 1 and the movable contact 2 are arranged in the contact accommodating cavity. The arc extinguishing chamber 3 is arranged on one side of the stationary contact 1 and the movable contact 2, specifically, on the side of the opening direction. When the movable contact 2 is separated from the stationary contact 1 and an arc is generated, the arc enters the arc extinguishing chamber 3 and is extinguished in the arc extinguishing chamber 3, so that the arc is extinguished and the circuit connected to the switch is disconnected.

[0025] Generally, the movable contact 2 is arranged to be rotatable on the base 41, and the stationary contact 1 is arranged to be fixed on the bottom plate 42. For a molded case circuit breaker, the movable contact 2 and the stationary contact 1 are arranged on the same base, and a cover is arranged to cover the movable contact 2 and the stationary contact 1.

[0026] As shown in the drawings, Figure 2 The bottom plate 42 is provided with the stationary contact 1. Generally, a pair of stationary contact 1 and movable contact 2 are arranged in one pole of the switch. In this embodiment, the switch is a three-pole switch. Correspondingly, there are three sets of stationary contact 1 and movable contact 2, and each pair of stationary contact 1 and movable contact 2 is arranged in one pole. However, the number of poles of the switch is not limited to three, and the switch can be a two-pole or four-pole switch, and correspondingly, there are two sets of stationary contact 1 and movable contact 2 or four sets of stationary contact 1 and movable contact 2.

[0027] The stationary contact 1 includes an electrically conductive block 11, a stationary arc contact 111 and a stationary main contact 112 fixed on the electrically conductive block 11. The stationary arc contact 111 is arranged on the side of the stationary main contact 112 close to the arc extinguishing chamber 3, and in the drawings, the stationary arc contact 111 is arranged above the stationary main contact 112. Correspondingly, the contact piece of the movable contact 2 includes an arc contact piece and a main contact piece, the arc contact piece is provided with a movable arc contact, and the main contact piece is provided with a movable main contact; the movable arc contact is in contact with the stationary arc contact 111, and the movable main contact is in contact with the stationary main contact 112. Generally, the arc contact piece has a greater extension length than the main contact piece.

[0028] An arc guiding piece 12 is further arranged on the electrically conductive block 11, and the arc guiding piece 12 is arranged above the stationary arc contact 111, and is used to guide the arc of the stationary contact 1 into the arc extinguishing chamber 3.

[0029] The conductive block 11 is further provided with a gasket 13, which covers the conductive block 11. The gasket 13 comprises two side portions 131, which extend downwardly, and the extending heads of the two side portions 131 form extending ends 1311.

[0030] As Figure 3 , the arc-extinguishing chamber 3 comprises a pair of side plates 31 and a plurality of fins 32 arranged between the pair of side plates 31. The fins 32 are spaced apart from each other. The arc-extinguishing chamber 3 further comprises a pair of gas generating members 33, which are arranged on the side of the fins 32 facing the moving contact 2 and the stationary contact 1. Preferably, the gas generating members 33 are arranged on the side of the stationary contact 1. More preferably, the gas generating members 33 wrap at least part of the fin legs of the fins 32.

[0031] The arc-extinguishing chamber 3 is provided with an ionization elimination assembly 34 on the gas outlet side of the fins 32, and is further provided with an arc-extinguishing cover 35 above the ionization elimination assembly 34. The ionization elimination assembly 34 is located between the fins 32 and the arc-extinguishing cover 35. After the arc is extinguished in the array of fins 32, the gas is filtered by the ionization elimination assembly 34 and is discharged outside the arc-extinguishing chamber 3 through the arc-extinguishing cover 35.

[0032] As Figure 4 , the gas generating members 33 comprise a wrapping portion 331, a protrusion 332 and an extending portion 333. The wrapping portion 331 is attached to the inner side of the fin legs of the fins 32. The protrusion 332 protrudes from the gas generating members 33 into the arc-extinguishing chamber. The extending portion 333 extends downwardly from the gas generating members 33.

[0033] More specifically, the wrapping portion 331 further extends a fixing portion 3311 toward the fin legs, which is inserted between the adjacent fin legs and is used for mounting and positioning the fin legs.

[0034] In the array direction of the grid plates 32, a fitting portion 334 is provided on the side of the protrusion 332 corresponding to the moving contact 2, and the fitting portion 334 is attached to the side plate 31. More specifically, in the array direction of the grid plates 32, the extension portion 333 and the fitting portion 334 are located on both sides of the protrusion 332. The extension portion 333 corresponds to one end of the stationary contact 2, while the fitting portion 334 is located at the other end. Furthermore, regarding the corresponding space formed between a pair of gas generating elements 33, the width between the pair of extension portions 333 is greater than the width between the pair of protrusions 332, and the width between the pair of fitting portions 334 is greater than the width between the pair of protrusions 332. More preferably, the width between the pair of fitting portions 334 is greater than the width between the pair of extension portions 333.

[0035] like Figure 5 This is a schematic diagram showing the gas-generating component 33 and the stationary contact 1 being installed together. The extension 333 of the gas-generating component 33 is located on both sides of the arc-initiating plate 12. Preferably, the extension 333 extends beyond the stationary arc contact 111. This arrangement prevents the arc generated on the stationary arc contact 111 from moving downwards from both sides to reach the stationary main contact 112. This arrangement facilitates the upward movement of the arc, thereby facilitating the rapid extinguishing of the arc. Preferably, the extension 333 is square; more preferably, the corners of the extension 333 are rounded. Regarding the placement of the extension 333, it is more effective if the extension 333 is attached to both sides of the stationary arc contact 111.

[0036] Example 2

[0037] In the second embodiment, the two sides 131 of the gasket 13 are located on both sides of the arc-inducing plate 12 and extend downwards, with their extended ends 1311 reaching the areas on both sides of the stationary arc contact 111. Preferably, the extended ends 1311 extend beyond the stationary arc contact 111. This arrangement prevents the arc generated on the stationary arc contact 111 from moving downwards from both sides to reach the stationary main contact 112. This arrangement facilitates the upward movement of the arc, thereby facilitating the rapid extinguishing of the arc.

[0038] Example 3

[0039] In the third embodiment, the two side portions 131 of the gasket 13 do not reach the two side regions of the static arc contact 111, and the extension end 1311 is provided separately from the two side portions 131. The extension end 1311 is provided separately, and is mounted on the conductive block 11 and located in the two side regions of the static arc contact 111. Preferably, the lower edge of the extension end 1311 reaches below the static arc contact 111. This also prevents the arc from moving downward from the two sides of the static arc contact 111 to reach the static main contact 112.

[0040] Embodiment 4

[0041] In the fourth embodiment, the two side portions 131 of the gasket 13 are located on the two sides of the arc striking piece 12 and extend downward, and the extension end 1311 reaches the two side regions of the static arc contact 111. Preferably, the extension end 1311 reaches below the static arc contact 111. At the same time, the extension portion 333 of the gas generating member 33 is located in the two side regions of the arc striking piece 12. Preferably, the extension portion 333 reaches below the static arc contact 111. At this time, the extension portion 333 is located above the extension end 1311 of the two side portions 131. That is, the extension end 1311 of the two side portions 131 is located between the conductive block 11 and the extension portion 333. The extension portion 333 and the extension end 1311 of the two side portions 131 can be in contact or in clearance fit.

[0042] Embodiment 5

[0043] In the fifth embodiment, the extension portion 333 is provided on the side plate 31 of the arc extinguishing chamber, that is, the extension portion 333 is a separate component which is directly provided on the side plate 31. The extension portion 333 is located in the two side regions of the static arc contact 111. Preferably, the lower edge of the extension portion 333 reaches below the static arc contact 111. This also prevents the arc from moving downward from the two sides of the static arc contact 111 to reach the static main contact 112.

[0044] For the above embodiments, the extension portion 333 and the extension end 1311 are collectively referred to as an insulating member. The insulating member includes the extension portion 333 provided on the arc extinguishing chamber 3, and / or the extension end 1311 provided on the static contact 1. The insulating member is located in the two side regions of the static arc contact 111. Preferably, the lower edge of the insulating member reaches below the lower edge of the static arc contact 111. This prevents the arc from moving downward from the two sides of the static arc contact 111 to reach the static main contact 112. Preferably, in the direction toward the outside of the conductive block 11, Figure 5The outer side surface of the insulating piece matches the contact surface of the static arc contact 111 for contact cooperation.

[0045] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

[0046] In summary, the technical scheme provided by the present application makes up for the shortcomings in the prior art, successfully completes the task of the present application, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. A contact arc extinguishing system of a switch, comprising a static contact (1), a dynamic contact (2) and an arc chamber (3), said arc chamber (3) being located at one side of said static contact (1) and dynamic contact (2), said static contact (1) comprising a conductive block (11), a static arc contact (111) and a static main contact (112) fixed on the conductive block (11), said static arc contact (111) being located at the side of said static main contact (112) close to said arc chamber (3); characterized in that: The insulating piece is arranged on both sides of the static arc contact (111), and a pair of the insulating pieces are used to prevent the arc from moving downward from both sides of the static arc contact (111) to the static main contact (112).

2. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The arc extinguishing chamber (3) comprises a pair of side plates (31), a plurality of grid fins (32) arranged between the pair of side plates (31), and a pair of gas generating pieces (33), the grid fins (32) are arranged at intervals, and the gas generating pieces (33) are arranged on the side of the grid fins (32) facing the moving contact (2) and the static contact (1); the insulating piece comprises an extension part (333), and the extension part (333) is arranged on the gas generating piece (33).

3. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The arc extinguishing chamber (3) comprises a pair of side plates (31), a plurality of grid fins (32) arranged between the pair of side plates (31), and the insulating piece comprises an extension part (333), and the extension part (333) is arranged on the side plate (31).

4. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The insulating piece comprises an extension end (1311), and a gasket (13) is further arranged on the conductive block (11), the gasket (13) covers the conductive block (11), the gasket (13) comprises two side portions (131), the two side portions (131) extend downward, and the extension ends (1311) of the two side portions (131) are formed.

5. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The insulating piece comprises an extension end (1311), and the extension end (1311) is arranged on the conductive block (11).

6. An arc quenching system for contacts of a switch according to claim 1, characterized in that: The insulating piece comprises an extension part (333) and an extension end (1311); a gasket (13) is further arranged on the conductive block (11), the gasket (13) covers the conductive block (11), the gasket (13) comprises two side portions (131), the two side portions (131) extend downward, and the extension ends (1311) of the two side portions (131) are formed; the arc extinguishing chamber (3) comprises a pair of side plates (31), a plurality of grid fins (32) arranged between the pair of side plates (31), and a pair of gas generating pieces (33), the grid fins (32) are arranged at intervals, and the gas generating pieces (33) are arranged on the side of the grid fins (32) facing the moving contact (2) and the static contact (1), the extension part (333) is arranged on the gas generating piece (33); and the extension end (1311) is located between the conductive block (11) and the extension part (333).

7. An arc quenching system for contacts of a switch according to claim 6, characterized in that: The extension part (333) is matched with the extension ends (1311) of the two side portions (131) in a gap mode.

8. An arc quenching system for contacts of a switch according to claim 2 or 6, characterized in that: The gas generating piece (33) further comprises a wrapping portion (331), and the wrapping portion (331) is attached to the inner side of the grid fin leg of the grid fin (32).

9. An arc quenching system for contacts of a switch according to claim 1, characterized in that: In the direction facing the outside of the conductive block (11), the outer side surface of the insulating piece is matched with the contact surface of the static arc contact (111) for contact matching.

10. An arc quenching system for contacts of a switch according to claim 8, characterized in that: The gas production part (33) further comprises a protrusion (332), and the extension (333) is located on the side of the protrusion (332) facing the static contact (1) in the array direction of the grid sheet (32), and the width between a pair of the extension (333) is greater than the width between a pair of the protrusion (332).

Images