Static contact of switch
By designing conductive blocks and open slot structures on the stationary contact, the arc is ensured to enter the arc-extinguishing chamber quickly, solving the problem of excessive arc duration and improving the switch's lifespan and breaking performance.
Patent Information
- Application Number
- CN202423321764.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
The existing switch contact system cannot quickly enter the arc-extinguishing chamber when the current is interrupted, resulting in an excessively long arc duration, which burns the contact system and affects the switch's lifespan and breaking performance.
Design a static contact structure including a conductive block and a lead-out bar. The conductive block is provided with a static arc contact and an open slot. The current is guided to the bottom of the static arc contact through the open slot to ensure that the arc enters the arc extinguishing chamber quickly. The static arc contact is fixed by welding process and is made of silver-based alloy material.
The electric arc enters the arc-extinguishing chamber quickly, shortening its duration, reducing contact system burn-out, and improving switch life and breaking performance.
Smart Images
Figure CN223884319U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to low voltage electrical apparatus technical field, and specifically relates to a static contact of switch. BACKGROUND
[0002] Switch, especially disconnecting switch as important low voltage electrical apparatus, realizes the control of the combination and separation of the current carrying, to meet the management of the power supply network on-off.
[0003] With the development of new energy, the high voltage application scene of frame circuit breaker (or disconnecting switch) is more and more. Frame circuit breaker (or disconnecting switch) usually includes contact system and arc extinguishing chamber, and arc is generated when contact system is disconnected, and the arc moves upward into the arc extinguishing chamber and is extinguished in the arc extinguishing chamber. For frame circuit breaker (or disconnecting switch), the arc has a large energy, therefore, if the arc is generated from the contact system, it cannot quickly enter the arc extinguishing chamber, which will cause serious burnout of the contact system, thereby reducing the service life of the whole switch and not suitable for the demand of high service life in new energy occasions. At the same time, the slow speed of the arc entering the arc extinguishing chamber will also lead to the overlong arc survival time, which will cause the failure of switch breaking.
[0004] In view of the above prior art, the applicant has made beneficial design to the contact structure of the existing switch, and the technical scheme to be introduced below is generated in this background. CONTENT OF THE UTILITY MODEL
[0005] The utility model relates to a static contact of switch, which can regulate the current direction flowing into the static arc contact point, thereby maximizing the upward electromagnetic force of the arc, enabling the arc to quickly enter the arc extinguishing chamber, shortening the arc survival time, reducing the burnout of the arc on the contact system, improving the service life of the switch and the breaking performance of the switch.
[0006] The utility model is accomplished in the following way, a static contact of switch, including conductive block, the conductive block includes contact cooperation block and outgoing line row, the contact cooperation block is equipped with static arc contact point, the outgoing line row is located static arc contact point below, the upper limit of contact cooperation block is opened a pair of open slot, a pair of open slot is located static arc contact point both sides, the open slot penetrates the thickness direction of contact cooperation block.
[0007] In one specific embodiment of the utility model, the open slot extends through the static arc contact point.
[0008] In another specific embodiment of the utility model, the contact cooperation block and the outgoing line row constitute a "T" shape arrangement and are integrally formed.
[0009] In another specific embodiment of the utility model, the static arc contact is located between the pair of static main contacts in the width direction of the contact matching block; in the height direction of the contact matching block, the pair of static main contacts are in the same height direction, and the height of the static arc contact is greater than the height of the static main contacts, and the three form a "pin" shape.
[0010] In another specific embodiment of the utility model, the static arc contact is located between the pair of static main contacts in the width direction of the contact matching block; in the height direction of the contact matching block, the pair of static main contacts are in the same height direction, and the height of the static arc contact is greater than the height of the static main contacts, and the three form a "pin" shape.
[0011] In another specific embodiment of the utility model, the switch comprises an arc extinguishing chamber, the arc extinguishing chamber comprises a pair of interval plates arranged at intervals and extending downwards, and an arc passage is formed between the pair of interval plates; a pair of abutting grooves are further arranged on the contact matching block, one side of the pair of interval plates close to the static contact abuts in the pair of abutting grooves, the static arc contact is located inside the arc passage, and the static main contact is located outside the arc passage.
[0012] In another specific embodiment of the utility model, the static arc contact is a silver-based alloy and is fixed on the contact matching block through a welding process.
[0013] In another specific embodiment of the utility model, the static arc contact is formed by the corresponding convex part of the contact matching block.
[0014] In another specific embodiment of the utility model, the switch further comprises a moving contact, the moving contact comprises a moving contact piece and a contact cover, the moving contact piece is rotatably arranged on a contact support of the moving contact, and the contact cover is fixedly installed on the contact support; a gap notch is arranged on the lower edge of the contact matching block, the gap notch corresponds to the contact cover, and the contact cover and the gap notch are gap-fitted.
[0015] In another specific embodiment of the utility model, a fixing hole is further arranged on the contact matching block, the fixing hole is a pair of fixing holes and is respectively arranged on the left and right outer sides of the pair of opening grooves.
[0016] The utility model discloses a static contact piece and arc extinguishing chamber structure, the static contact piece and arc extinguishing chamber structure has the advantages that: the static contact piece includes the contact cooperation piece, and a pair of open grooves are arranged on the upper edge of the contact cooperation piece, and the pair of open grooves are located at the two sides of the static arc contact point, so that the current flowing into the static arc contact point can flow out of the static arc contact point, the maximum of the electromagnetic force of the traction arc is guaranteed, the arc can quickly enter the arc extinguishing chamber, the arc survival time is shortened, the burning loss of the arc to the contact system is reduced, the service life of the switch is improved, and the breaking performance of the switch is improved. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is the structure schematic diagram of the static contact piece of the utility model;
[0018] Figure 2 is the structure schematic diagram of the static contact piece of the utility model;
[0019] Figure 3 is the structure schematic diagram of the arc extinguishing chamber of the utility model;
[0020] Figure 4 is the structure schematic diagram of the static contact piece of the utility model;
[0021] Figure 5 is the structure schematic diagram of the static contact piece of the utility model;
[0022] Figure 6 is the structure schematic diagram of the static contact piece of the utility model;
[0023] Figure 7 is the structure schematic diagram of the bottom plate of the utility model.
[0024] In the drawing: 1. static contact piece, 11. conductive block, 111. contact cooperation piece, 112. outgoing line row, 12. static contact point, 121. static main contact point, 122. static arc contact point, 13. give place gap, 14. open groove, 15. fixed hole, 16. abutting groove;2. moving contact, 21. moving contact piece, 211. long contact piece, 2111. moving arc contact point, 212. short contact piece, 2121. moving main contact point, 22. contact cover, 221. bulge;3. arc extinguishing chamber, 31. interval plate, 32. side wall;4. bottom plate, 41. pole cavity, 42. through hole, 43. cooperation concave cavity, 44. mounting hole, 45. positioning boss, 46. screw hole;100. static arc leading piece. DETAILED DESCRIPTION
[0025] The utility model discloses a static contact piece and arc extinguishing chamber structure, the static contact piece and arc extinguishing chamber structure has the advantages that: the static contact piece includes the contact cooperation piece, and a pair of open grooves are arranged on the upper edge of the contact cooperation piece, and the pair of open grooves are located at the two sides of the static arc contact point, so that the current flowing into the static arc contact point can flow out of the static arc contact point, the maximum of the electromagnetic force of the traction arc is guaranteed, the arc can quickly enter the arc extinguishing chamber, the arc survival time is shortened, the burning loss of the arc to the contact system is reduced, the service life of the switch is improved, and the breaking performance of the switch is improved.
[0026] In the following description, the directional or positional concepts of up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and are only used to facilitate the description of the technical solutions provided by the utility model and simplify the description, and therefore cannot be understood as a special limitation on the technical solutions provided by the utility model.
[0027] As Figure 1 , the switch includes a contact system, the contact system includes a static contact 1, a moving contact 2, and an arc extinguishing chamber 3 is arranged above the contact system. The switch further includes a shell, the shell includes a base (not shown) and a bottom plate 4, the base and the bottom plate 4 are spliced to form the shell. The shell is internally provided with a contact cavity, the contact system is installed in the contact cavity, and the arc extinguishing chamber 3 is installed at an opening above the contact cavity.
[0028] Generally, the static contact 1 is fixedly installed on the bottom plate 4, and the moving contact 2 is rotatably installed on the base. When the base and the bottom plate 4 are spliced, the moving contact 2 and the static contact 1 are also installed in place.
[0029] As Figure 2 , the static contact 2 is fixedly installed on the bottom plate 4 by screws, a static arc guiding piece 100 is installed above the static contact 2, a lower end of the static arc guiding piece 100 is fixedly connected with the static contact 2, and an upper end, i.e. an extension end, of the static arc guiding piece 100 extends into the arc extinguishing chamber 3. The static arc guiding piece 100 can guide the arc to quickly enter the arc extinguishing chamber 3.
[0030] As Figure 3 , the arc extinguishing chamber 3 includes a pair of spaced apart and downwardly extending spacer plates 31, a pair of side walls 32 and a plurality of grid fins (not shown) arranged between the pair of side walls 32. The plurality of grid fins are spaced apart from each other. An arc passage is formed between the pair of spacer plates 31, and the pair of spacer plates 31 protrude out of the arc extinguishing chamber 3 and extend towards the contact system.
[0031] As Figure 4The moving contact 2 comprises a moving contact piece 21 and a contact cover 22. The moving contact piece 21 is rotatably arranged on a contact support of the moving contact 2, and the contact cover 22 is fixedly arranged on the contact support. The moving contact piece 21 comprises a long contact piece 211 and a short contact piece 212. The long contact piece 211 has a greater extension length than the short contact piece 212. The head of the long contact piece 211 is arranged in an arc channel of the arc extinguishing chamber 3, and the short contact piece 212 is arranged outside the arc extinguishing chamber 3. An arc contact 2111 is arranged on the long contact piece 211, and a main contact 2121 is arranged on the short contact piece 212. The arc contact 2111 is arranged inside the arc channel, and the main contact 2121 is arranged outside the arc channel. The contact cover 22 is provided with a protrusion 221.
[0032] A partition plate 31 is arranged between the long contact piece 211 and the short contact piece 212, and cooperates with the contact cover 22 to isolate the long contact piece 211 from the short contact piece 212.
[0033] As Figure 5 、 Figure 6 Fig. 1 is a schematic view of a static contact 1. The static contact 1 comprises a conductive block 11. The conductive block 11 is usually made of copper material with excellent conductive performance. The static contact 1 further comprises a static contact 12. The static contact 12 is fixedly arranged on the conductive block 11.
[0034] The conductive block 11 comprises a contact fitting block 111 and a wire outlet row 112. Preferably, the contact fitting block 111 and the wire outlet row 112 are integrally formed. The contact fitting block 111 and the wire outlet row 112 are arranged in a "T" shape. Of course, the contact fitting block 111 and the wire outlet row 112 can also be arranged separately. In this case, the two are usually fixed by screws. The contact fitting block 111 is used to cooperate with the moving contact 2, and the wire outlet row 112 is used for electrically connecting the static contact 1 with the outside or other components of the switch.
[0035] The static contact 12 further comprises a static main contact 121 and a static arc contact 122. Specifically, the static main contact 121 and the static arc contact 122 are both mounted on the contact matching block 111. In the embodiment, the static main contact 121 is a pair of contacts, which are arranged apart from each other, and the static arc contact 122 is a single contact. In the width direction, the static arc contact 122 is located between the pair of static main contacts 121, and the three form a "pin" shape. The pair of static main contacts 121 are at the same height direction on the conductive block 11, and the height of the static arc contact 122 is greater than that of the static main contact 121, that is, the static arc contact 122 is located higher than the static main contact 121 in the extension direction of the conductive block 11 towards the arc-extinguishing chamber 3. The static arc contact 122 is located inside the arc passage, and the static main contact 121 is located outside the arc passage.
[0036] In the present application, the static arc contact 122 should be understood in a broad sense. The static arc contact 122 can be a silver-based alloy and be fixed on the contact matching block 111 by a welding process, or the static arc contact 122 can be formed by the corresponding convex part of the contact matching block 111, in which case the material of the static arc contact 122 is consistent with that of the contact matching block 111, which is a copper-based alloy.
[0037] The static main contact 121 is in contact with the dynamic main contact 2121 for current carrying, and the static arc contact 122 is in contact with the dynamic arc contact 2111 for arc striking and current carrying.
[0038] The contact matching block 111 is substantially rectangular, and a clearance notch 13 is arranged on the lower edge of the contact matching block 111. The clearance notch 13 corresponds to the contact cover 22, and the contact cover 22 is always in small gap cooperation with the clearance notch 13 during the movement of the dynamic contact 2, that is, the two do not contact. Preferably, the clearance notch 13 corresponds in shape to the raised part 221, and in the embodiment, the clearance notch 13 is square.
[0039] A pair of open grooves 14 are arranged on the upper edge of the contact matching block 111, and the open grooves 14 are located on both sides of the static arc contact 122. The open grooves 14 extend downward from the upper edge of the contact matching block 111, and preferably, the open grooves 14 extend through the static arc contact 122. The open grooves 14 pass through the thickness direction of the contact matching block 111, that is, the open grooves 14 are through grooves, which pass through the front surface of the contact matching block 111 on which the static arc contact 122 is mounted and the back surface of the contact matching block 111 away from the static arc contact 122.
[0040] A fixing hole 15 is arranged on the contact fitting block 111, and a screw is screwed into the bottom plate 4 through the fixing hole 15 to fix the contact fitting block 111 on the bottom plate 4. The fixing hole 15 is a pair of holes arranged on the left and right sides of the pair of open grooves 14.
[0041] A pair of abutting grooves 16 is arranged on the contact fitting block 111. The abutting grooves 16 are half grooves, and the pair of abutting grooves 16 is arranged on the left and right sides of the static arc contact 122 and between the pair of static main contacts 121.
[0042] Continued to see Figure 5 , Figure 6 When the static contact 1 and the dynamic contact 2 break the current, the arc is generated on the static arc contact 122 and the dynamic arc contact 2111. Due to the arrangement of the pair of open grooves 14, the current near the static arc contact 122 cannot flow to the outgoing line row 112 from the left and right sides of the static arc contact 122, and must flow to the outgoing line row 112 from the bottom of the static arc contact 122, thereby converging the current and guiding the current flow, thereby ensuring that the electromagnetic force F on the static arc contact 122 is necessarily upward, and the upward electromagnetic force F can push the arc upward and quickly enter the arc extinguishing chamber 3.
[0043] As Figure 7 , the bottom plate 4 is a schematic view of the bottom plate 4. The bottom plate 4 is usually made of thermosetting material, such as DMC or BMC, and the bottom plate 4 is a three-pole shell, wherein one pole in the middle is empty, and a plurality of partition plates are extended on the bottom plate of the bottom plate 4 to divide the bottom plate 4 into a plurality of pole cavities 41. In this embodiment, the two poles on which the static contact 1 is installed are located on the left and right sides.
[0044] A through hole 42 is arranged on the pole cavity 41, and the through hole 42 is used for the outgoing line row 112 to pass through, that is, the static contact 1 is installed in the pole cavity 41, and the outgoing line row 112 on the static contact 1 passes through the through hole 42 to the outside of the bottom plate 4 for electrical connection.
[0045] A fitting recess 43 is arranged on the pole cavity 41, and the fitting recess 43 is not a through cavity, that is, the fitting recess 43 does not communicate with the outside of the bottom plate 4. The fitting recess 43 is used to correspond to the accommodation notch 13 and cooperate with the protruding part 221 on the contact cover 22, and the outside cavity of the fitting recess 43 cooperates with the lower part on the contact cover 22.
[0046] The pole cavity 41 is further provided with a mounting hole 44, which is correspondingly matched with the fixing hole 15, and is used for mounting the static contact 1, in particular, the contact matching block 111 of the static contact 1 is matched with the bottom plate 4.
[0047] Above the pole cavity 41, a positioning boss 45 and a screw hole 46 are arranged, which are both matched with the upper end of the static arc guiding piece 100, wherein the positioning boss 45 is clamped into the hole in the upper end of the static arc guiding piece 100, and plays a positioning role, and the screw hole 46 is used for fixing the upper end of the static arc guiding piece 100.
[0048] When the static contact 1 and the arc extinguishing chamber 3 are both mounted in place, a pair of spacer plates 31 on the arc extinguishing chamber 3 abut against a pair of abutting grooves 16 on one side of the static contact 1. The static arc contact 122 and the static main contact 121 are separated, that is, the static arc contact 122 is located between the pair of spacer plates 31, and the static main contact 121 is located outside the spacer plates 31.
Claims
1. A stationary contact of a switch, comprising a conductive block (11), said conductive block (11) comprising a contact mating block (111) and a wire outlet row (112), said contact mating block (111) being provided with a stationary arc contact (122), said wire outlet row (112) being located below said stationary arc contact (122), characterized in that: A pair of opening grooves (14) are provided at the upper edge of the contact fitting block (111). The pair of opening grooves (14) are located on both sides of the static arc contact (122), and the opening grooves (14) penetrate through the thickness direction of the contact fitting block (111).
2. A stationary contact of a switch according to claim 1, characterized in that: The opening groove (14) extends past the static arc contact (122).
3. A stationary contact of a switch according to claim 1, characterized in that: The contact fitting block (111) and the outgoing line row (112) are arranged in a "T" shape and integrally formed.
4. A stationary contact of a switch according to claim 1, characterized in that: A pair of static main contacts (121) are further installed on the contact fitting block (111). The pair of static main contacts (121) are spaced apart from each other, and there is one static arc contact (122). The opening groove (14) is located above the static main contacts (121).
5. A stationary contact of a switch according to claim 4, characterized in that: In the width direction of the contact fitting block (111), the static arc contact (122) is located between the pair of static main contacts (121); in the height direction of the contact fitting block (111), the pair of static main contacts (121) are in the same height direction, and the height of the static arc contact (122) is greater than the height of the static main contacts (121), and the three form a "pin" shape.
6. A stationary contact of a switch according to claim 5, characterized in that: The switch includes an arc extinguishing chamber (3). The arc extinguishing chamber (3) includes a pair of spaced apart and downwardly extending spacer plates (31). An arc channel is formed between the pair of spacer plates (31); a pair of abutting grooves (16) are further provided on the contact fitting block (111). One side of the pair of spacer plates (31) close to the static contact (1) abuts in the pair of abutting grooves (16). The static arc contact (122) is located inside the arc channel, and the static main contact (121) is located outside the arc channel.
7. A stationary contact of a switch as defined in claim 1, characterized in that: The static arc contact (122) is made of a silver-based alloy and is fixed on the contact fitting block (111) by a welding process.
8. A stationary contact of a switch according to claim 1, characterized in that: The static arc contact (122) is formed by a corresponding convex portion of the contact fitting block (111).
9. A stationary contact of a switch according to claim 1, characterized in that: The switch further includes a moving contact (2). The moving contact (2) includes a moving contact piece (21) and a contact head cover (22). The moving contact piece (21) is rotatably arranged on the contact support of the moving contact (2), and the contact head cover (22) is fixedly installed on the contact support; a让位缺口 (13) is provided on the lower edge of the contact fitting block (111). The让位缺口 (13) corresponds to the contact head cover (22), and the contact head cover (22) is in clearance fit with the让位缺口 (13).
10. A stationary contact of a switch according to claim 1, characterized in that: A pair of fixing holes (15) are further provided on the contact fitting block (111). The pair of fixing holes (15) are respectively located on the left and right outer sides of the pair of opening grooves (14).