Switch with improved structure
By setting protrusions on the contact support of the moving contact and staggering the protrusions of the housing, the breakdown problem of air circuit breakers in high-voltage environments is solved, longer creepage distance and electrical clearance are achieved, arc gas leakage is prevented, and the reliability and safety of the circuit breaker are improved.
Patent Information
- Application Number
- CN202520858784.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-04-30
AI Technical Summary
Existing air circuit breakers are prone to contact system breakdown under high voltage environments, especially due to insufficient creepage distance between the moving contact and the hinged arm, which leads to arc gas leakage.
A protrusion is provided on the contact support of the moving contact. The protrusion is located on the side of the contact piece away from the stationary contact and is interlocked with the mating protrusion of the housing. This lengthens the creepage distance between the contact piece head and the hinge arm, increasing the electrical clearance to prevent breakdown.
It effectively prevents breakdown between the moving contact and the hinged arm, hinders the leakage of arc gas, and improves the reliability and safety of the circuit breaker.
Smart Images
Figure CN223884388U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to low voltage electrical apparatus technical field, more particularly in a kind of structure improved switch. BACKGROUND
[0002] As important distribution equipment, air circuit breaker is connected to power supply network, and is used to protect the load under it from damage of fault current. But with the development of new energy, the use of circuit breaker is more and more, and the voltage requirement is also increasing. New requirements are put forward for existing air circuit breaker.
[0003] The circuit breaker includes a contact system, which can be closed or separated to realize the conduction or disconnection of the circuit breaker. The contact system includes a movable contact and a fixed contact. The contact system is located inside the housing of the circuit breaker, and the housing includes a base and a bottom plate. The base and the bottom plate are spliced to form a contact receiving cavity inside them, which is used to accommodate the contact system. The movable contact is provided with a contact piece on the side close to the fixed contact, and a hinge arm is hinged to the back of the movable contact away from the fixed contact. In the actual working environment, a breakdown will occur between the contact piece and the hinge arm. SUMMARY
[0004] The utility model discloses a kind of structure improved switches, and it forms protruding part 111 on the contact support of movable contact, and the protruding part 111 is located on the head of the contact piece 12 side away from the fixed contact 2, to lengthen the creepage distance between the head of movable contact and hinge arm, to prevent the occurrence of breakdown.
[0005] The utility model discloses a kind of structure improved switches, and it forms protruding part 111 on the contact support of movable contact, and the protruding part 111 is located on the head of the contact piece 12 side away from the fixed contact 2, to lengthen the creepage distance between the head of movable contact and hinge arm, to prevent the occurrence of breakdown.
[0006] In one specific embodiment of the utility model, the protruding part extends to the back of the contact support and forms a "┌" shape.
[0007] In another specific embodiment of the utility model, the housing includes a base and a bottom plate, the base has a mating protrusion and an opening, the mating protrusion is located above the opening, and the protruding part is staggered with the mating protrusion.
[0008] In another specific embodiment of the utility model, the top surface cooperates with the matching protrusion, the protruding part is higher than the top surface, and the top surface is below the matching protrusion.
[0009] In another specific embodiment of the utility model, the top surface cooperates with the matching protrusion, the protruding part is higher than the top surface, and the top surface is below the matching protrusion.
[0010] In another specific embodiment of the utility model, the matching protrusion and the protruding part form a first gap.
[0011] In another specific embodiment of the utility model, the matching protrusion and the protruding part form a first gap.
[0012] In another specific embodiment of the utility model, the first gap comprises a gap section and an enlarged section, the gap section and the enlarged section are communicated, the enlarged section is at one end of the first gap close to the second gap, and the gap width d2 of the enlarged section is greater than the gap width d1 of the gap section.
[0013] In another specific embodiment of the utility model, the number of the matching protrusions is two or more, and they are arranged in the direction from the rotation center of the movable contact to the rotating side; correspondingly, the contact support has a number of matching protruding parts.
[0014] In another specific embodiment of the utility model, the contact support further comprises a cavity, and the head of the short contact piece is embedded in the cavity.
[0015] In another specific embodiment of the utility model, the movable contact further comprises a hinged arm, the hinged arm is hinged to the back of the contact support away from the contact piece, one end of the hinged arm is hinged to the contact support, and the other end is connected with the operating mechanism of the switch.
[0016] The utility model has the beneficial effects that: first, the protruding part is formed on the contact support of the movable contact, the protruding part is on the side of the head of the contact piece away from the fixed contact, thereby lengthening the creeping distance between the head of the movable contact and the hinged arm, and preventing the occurrence of breakdown; second, the protruding part and the matching protrusion on the base stagger and cooperate, which can lengthen the electrical gap between the head of the contact piece and the hinged arm, and hinder the overflow of arc gas to the hinged arm, thereby preventing the occurrence of breakdown. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 The switch explosion schematic view of the utility model is shown in the figure;
[0018] Figure 2 The moving contact explosion schematic view of the utility model is shown in the figure;
[0019] Figure 3 The one side three-dimensional schematic view of the contact support of the utility model is shown in the figure;
[0020] Figure 4 The other side three-dimensional schematic view of the contact support of the utility model is shown in the figure;
[0021] Figure 5 The base schematic view of the utility model is shown in the figure;
[0022] Figure 6 The schematic view of the contact support and the base cooperation of the utility model is shown in the figure;
[0023] In the figure: 1. moving contact, 11. contact support, 111. protruding part, 1111. first protruding part, 1112. second protruding part, 112. cavity, 113. partition, 114. spring accommodating cavity, 115. side plate accommodating cavity, 116. positioning groove, 117. mounting cavity, 12. contact piece, 121. long contact piece, 122. short contact piece, 13. side plate, 14. contact cover, 15. insulating blocking piece, 151. first blocking piece, 152. second blocking piece, 16. outgoing line row, 17. mounting seat, 18. hinged arm; 2. static contact; 3. shell, 31. base, 311. cooperation protrusion, 312. opening, 32. bottom plate; 4. arc extinguishing chamber; 100. top surface; 200. first gap, 201. gap section, 202. amplification section; 300. second gap. DETAILED DESCRIPTION
[0024] The specific embodiments of the utility model are described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any formal but not substantial changes according to the concept of the utility model should be regarded as the protection scope of the utility model.
[0025] In the following description, the concepts of directionality (or directionality) such as up, down, left, right, front and back are described in the position state corresponding to the 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.
[0026] For example, Figure 1The switch comprises an isolating switch and a circuit breaker. The switch comprises a contact system, the contact system comprising a moving contact 1 and a stationary contact 2, the moving contact 1 swinging to contact or separate from the stationary contact 2 to realize the closing or separation of the switch. The switch further comprises a housing 3 and an arc extinguishing chamber 4.
[0027] The housing 3 comprises a base 31 and a bottom plate 32, the base 31 and the bottom plate 32 being spliced to form the housing 3. Generally, the base 31 and the bottom plate 32 are fixed by screwing.
[0028] Specifically, the moving contact 1 is mounted on the base 31, and the stationary contact 2 is mounted on the bottom plate 32. The moving contact 1 is rotatably arranged, and the stationary contact 2 is fixedly arranged. The arc extinguishing chamber 4 is located at the gas outlet side of the contact system, and the arc generated on the moving contact 1 and the stationary contact 2 enters the arc extinguishing chamber 4 and is extinguished inside the arc extinguishing chamber 4.
[0029] As shown in Figure 2 is a schematic view of the moving contact 1. The moving contact 1 comprises a contact support 11, a contact piece 12, a side plate 13 and a contact cover 14. The contact piece 12 is rotatably arranged on the contact support 11. Specifically, the contact piece 12 can be directly rotatably arranged on the contact support 11, or rotatably arranged on the side plate 13 which is fixedly arranged on the contact support 11. Both of the above belong to the contact piece 12 rotatably arranged on the contact support 11. The contact cover 14 is mounted on the front side of the contact piece 12, i.e. the side away from the contact support 11. The side plate 13 is made of metal and is a pair, mounted on both sides of the contact support 11. An insulating blocking piece 15 is mounted on the outer side of each side plate 13. Thus, the insulation of the moving contact 1 is improved, i.e. to prevent the side plate 13 from being punctured by other metal parts.
[0030] The contact support 11 is made of insulating material, such as DMC, BMC and other thermosetting materials.
[0031] Specifically, the contact piece 12 comprises long contact pieces 121 and short contact pieces 122, the long contact pieces 121 and the short contact pieces 122 being arranged side by side, more specifically, the long contact pieces 121 being located in the middle and the short contact pieces 122 being located on both sides of the long contact pieces 121, more specifically, the long contact pieces 121 being a plurality of pieces arranged side by side, and the short contact pieces 122 being a plurality of pieces divided into two groups and located on both sides of one group of long contact pieces 121. Generally, the long contact pieces 121 are arc contact pieces, and the short contact pieces 122 are main contact pieces.
[0032] The side plate 13 is a metal side plate. Thus, the side plate 13 has better strength, and the side plate 13 is installed on both sides of the contact support 11 to provide installation and positioning effects for other components of the movable contact 1.
[0033] The contact cover 14 is made of an insulating material, preferably a thermoplastic material. The contact cover 14 is clamped into position from the front side of the contact piece 12, and the two sides are clamped with the side plates 13. Thus, the installation of the contact cover 14 is completed. This installation method replaces the original fastening method using threaded parts, improving the installation efficiency.
[0034] The insulating blocking piece 15 is a plate material, including a first blocking piece 151 and a second blocking piece 152, and the first blocking piece 151 and the second blocking piece 152 are respectively installed on the two outer sides of a pair of side plates 13.
[0035] Continued to see Figure 2 The movable contact 1 further includes a wire outlet row 16, a mounting seat 17, and a hinged arm 18. The wire outlet row 16 is located at one end of the rotation center of the movable contact 1, the mounting seat 17 is installed on the wire outlet row 16 and fixed with the base 31, so that the wire outlet row 16 is fixed relative to the base 31. The wire outlet row 16 is conductively connected to one end of the contact piece 12 through a conductive soft connection (not shown).
[0036] The hinged arm 18 is hinged at one end to the contact support 11, and the other end is connected to the operating mechanism (not shown) of the switch. After the operating mechanism of the switch operates, the hinged arm 18 drives the movable contact 1 to operate. Specifically, the hinged arm 18 is hinged to the back of the contact support 11 away from the contact piece 12.
[0037] As Figure 3 , Figure 4 , a schematic view of the contact support 11 is shown. The contact support 11 includes a protruding part 111 and a cavity 112. The contact piece 12 is placed in the cavity 112, and the protruding part 111 cooperates with the head of the contact piece 12. The protruding part 111 is located on the side of the head of the contact piece 12 away from the stationary contact 2. The protruding part 111 is used to lengthen the creepage distance of the head of the contact piece 12 to the hinged arm 18. Thus, the occurrence of breakdown is prevented.
[0038] In the embodiment, the protruding part 111 comprises a first protruding part 1111 corresponding to the long contact piece 121 and a second protruding part 1112 corresponding to the short contact piece 122. Since the short contact piece 122 is located on both sides of the long contact piece 121, the second protruding part 1112 is two and located on both sides of the first protruding part 1111. Preferably, the first protruding part 1111 and the second protruding part 1112 are integrally formed.
[0039] In combination Figure 5 The bottom wall of the base 31 has a matching protrusion 311 and an opening 312, and the matching protrusion 311 is located above the opening 312. The matching protrusion 311 has a shape extending inward of the base 31 relative to the bottom wall of the base 31. The opening 312 is used for the passage of the articulated arm 18, that is, the side of the opening 312 towards the base 31 is the moving contact 1, and the side of the opening 312 towards the outside is the operating mechanism (not shown) of the switch.
[0040] The protruding part 111 extends to the back of the contact support 11, forming a "┌" shape. The contact support 11 has a top surface 100 matched with the base 31, preferably, the top surface 100 is a circular arc surface, which can realize better matching effect with the base 31, that is, reduce the space between them. The protruding part 111 is higher than the top surface 100. That is, the top surface 100 is located below the matching protrusion 311, and the protruding part 111 is located above the matching protrusion 311, forming staggered matching. This kind of matching can significantly lengthen the creepage distance between the head of the contact piece 12 and the articulated arm 18, thereby preventing the occurrence of breakdown, at the same time, can lengthen the electrical gap between the head of the contact piece 12 and the articulated arm 18, hinder the arc gas overflowing to the articulated arm 18, thereby preventing the occurrence of breakdown.
[0041] The protruding part 111 can also extend upward and beyond the upper edge of the head of the contact piece 12, which can also lengthen the creepage distance after matching with the matching protrusion 311 of the base 31.
[0042] The contact support 11 also has a spacer 113 connected or combined on the contact support 11 and inserted into the gap in the adjacent contact piece 12.
[0043] The contact support 11 also has a spring accommodating cavity 114 for accommodating a contact spring (not shown), and the extended end of the contact spring abuts against the contact piece 12.
[0044] The contact support 11 has a side plate accommodating cavity 115 on both sides, which is used for the matching installation of the side plate 13; meanwhile, the insulating cover 15 covers the side plate 13 and is also placed in the side plate accommodating cavity 115.
[0045] The contact support 11 also has a positioning groove 116 on the end face of the side facing the stationary contact 2, which is used for the plug-in matching of the two side portions of the contact cover 14.
[0046] The contact support 11 has a mounting cavity 117 on the back, which is used for the penetration of one end of the articulated arm 18 and is articulated with the contact support 11.
[0047] As shown in Figure 6 When the movable contact 1 is in the off-to-position state, it matches with the base 31.
[0048] The matching protrusion 311 is embedded between the top surface 100 and the convex portion 111, thereby lengthening the electrical gap between the head of the contact piece 12 and the articulated arm 18. Specifically, a first gap 200 is formed between the matching protrusion 311 and the convex portion 111. The existence of the first gap 200 makes the movable contact 1 better match with the base 31 when the movable contact 1 is a moving part. A second gap 300 is formed between the matching protrusion 311 and the top surface 100.
[0049] The first gap 200 and the second gap 300 are in communication.
[0050] Preferably, the first gap 200 includes a gap section 201 and an enlarged section 202, which are in communication, and the enlarged section 202 is located at one end of the first gap 200 close to the second gap 300. The gap width d2 of the enlarged section 202 is greater than the gap width d1 of the gap section 201. The enlarged section 202 is used to accommodate the particles generated from the movable contact 1. The particles placed in the enlarged section 202 can prevent the particles from being stuck in the gap section 201 and affecting the mobility of the movable contact 1. Preferably, d1 is between 0.5 mm and 2 mm; d2 is between 1 mm and 5 mm.
[0051] Preferably, an acute angle is formed between the first gap 200 and the second gap 300, and more specifically, the acute angle extends towards the inner side of the base 31.
[0052] In the above embodiment, the convex part 111 is located at the back side of the contact 12, and the contact 12 comprises a long contact 121 and a short contact 122, the convex part 111 can be located only at the back side of the long contact 121, or the convex part 111 is located only at the back side of the short contact 122, or the convex part 111 is located at the back side of the long contact 121 and the short contact 122, all of which can improve the insulation of the moving contact 1 and prevent the occurrence of breakdown.
[0053] If the contact 12 only comprises the short contact 122, the convex part 111 corresponds to all the short contacts 122, that is, the convex part 111 is located at the back side of the short contact 122.
[0054] In the embodiment, the head of the short contact 111 is embedded into the cavity 112, and the creepage distance between the short contact 111 and the hinged arm 18 can also be lengthened.
[0055] As another embodiment, the matching protrusions 311 are two or more, which are arranged in the direction from the rotation center of the moving contact 1 to the rotating side; correspondingly, the contact support 11 has a number of matching convex parts 111, and the convex parts 111 and the matching protrusions 311 are matched with each other, at this time, a better breakdown prevention effect can be achieved.
[0056] In summary, the technical scheme of the utility model makes up for the defects in the prior art, successfully completes the utility model task, and truly realizes the technical effects described in the technical effect column above.
Claims
1. A structurally improved switch comprising a movable contact (1), a stationary contact (2) and a housing (3), said movable contact (1) and stationary contact (2) being arranged inside said housing (3), said movable contact (1) comprising a contact support (11) and a contact blade (12), said contact blade (12) being arranged rotatably on said contact support (11), characterized in that: The contact support (11) comprises a top surface (100) at the rotating end, and a protrusion (111) is arranged on the top surface (100), and the protrusion (111) is located at the side of the head of the contact piece (12) away from the fixed contact (2).
2. A structurally improved switch as claimed in claim 1, wherein: The protrusion (111) extends outwards to the back of the contact support (11) and forms a "┌" shape.
3. A structurally improved switch as claimed in claim 2, wherein: The shell (3) comprises a base (31) and a bottom plate (32), the base (31) is provided with a matching protrusion (311) and an opening (312), the matching protrusion (311) is located above the opening (312), and the protrusion (111) is staggered with the matching protrusion (311).
4. A structurally improved switch as claimed in claim 1, wherein: The contact piece (12) comprises a long contact piece (121) and a short contact piece (122), and the short contact piece (122) is located on both sides of the long contact piece (121); the protrusion (111) is located on the back side of the long contact piece (121) or the protrusion (111) is located on the back side of the long contact piece (121) and the short contact piece (122).
5. A structurally improved switch as claimed in claim 3, wherein: The top surface (100) is matched with the matching protrusion (311), the protrusion (111) is higher than the top surface (100), and the top surface (100) is located below the matching protrusion (311).
6. A structurally improved switch as claimed in claim 5, wherein: A first gap (200) is formed between the matching protrusion (311) and the protrusion (111).
7. A structurally improved switch as claimed in claim 6, wherein: A second gap (300) is formed between the matching protrusion (311) and the top surface (100), and the first gap (200) and the second gap (300) are communicated.
8. A structurally improved switch as claimed in claim 7, wherein: The first gap (200) comprises a gap section (201) and an enlarged section (202), the gap section (201) and the enlarged section (202) are communicated, the enlarged section (202) is located at one end of the first gap (200) close to the second gap (300), and the gap width d2 of the enlarged section (202) is greater than the gap width d1 of the gap section (201).
9. A structurally improved switch as claimed in claim 3, wherein: The number of the matching protrusions (311) is two or more, which are arranged in the direction from the rotating center of the movable contact (1) to the rotating side; correspondingly, the number of the protrusions (111) on the contact support (11) is matched.
10. A structurally improved switch as claimed in claim 4, wherein: The contact support (11) further comprises a cavity (112), and the head of the short contact piece (122) is embedded in the cavity (112).
11. A structurally improved switch as claimed in claim 1, wherein: The movable contact (1) further comprises a hinged arm (18), the hinged arm (18) is hinged to the back of the contact support (11) away from the contact piece (12), one end of the hinged arm (18) is hinged to the contact support (11), and the other end is connected with an operating mechanism of a switch.