A disconnector

Abstract

The utility model relates to an isolator, belong to low voltage electric appliance technical field. Including casing, movable contact lever, the movable contact lever rotationally is arranged in the casing, static guide pole and arc extinguishing device, static guide pole is positioned on the casing, and arc extinguishing device is arranged in the casing, and the arc extinguishing device has a passage that is surrounded by arc extinguishing device shell three sides and constitutes, the static guide pole includes the electrically conductive plate that extends to the arc extinguishing device in the rotation plane of the movable contact lever, and the contact part that extends to the passage and the arc leading part that is located the passage outside are constituted on the electrically conductive plate, the movable contact lever is contacted or separates with the contact part in the passage. Advantage: ensure that arc generates and stretches in the passage, and arc jumps from the contact part to the arc leading part under the action of gas blow and magnetic blow, make the burning of arc to the contact part reduce, thereby improve switch reliability and electric life, and the arrangement of arc leading part is located the passage outside, more favorably, lengthen arc, realize quick arc extinguishing.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical technology, specifically relating to an isolating switch. Background Technology

[0002] Disconnect switches are widely used in power distribution and automation systems in industries such as construction, power, and petrochemicals. Their key advantage is that, under specified circuit conditions (usually after the current has been cut off), they establish a safe and visible air gap with sufficient insulation distance, reliably isolating a portion of the circuit from the live components. This ensures the absolute safety of personnel and equipment during maintenance and repair. Specifically, during power outage maintenance of electrical equipment, isolating the equipment from the power source creates a clear disconnect point, preventing safety accidents.

[0003] With the development and utilization of clean energy, the installed capacity and proportion of photovoltaic power generation in the power system have been increasing year by year. The aforementioned disconnecting switch, as an important control and protection device for DC photovoltaic power generation, undertakes the task of connecting and disconnecting current. A disconnecting switch typically includes two stationary contacts and one moving contact. The moving contact performs the task of connecting and disconnecting between the two stationary contacts. When the moving contact (also called "moving contact rod") and the stationary contact (also called "stationary conductor rod") are separated (i.e., disconnected), an electric arc is generated. The electric arc can damage the contacts and pose a safety hazard to the use of the disconnecting switch.

[0004] Given that the arc breaking process includes the arc breaking initiation stage, the arc generation stage, the arc transfer and elongation stage, and the arc extinction stage, it is of great significance to explore arc spatial control measures. The technical solution to be introduced below is generated in this context. Utility Model Content

[0005] The objective of this invention is to provide an isolating switch that significantly reduces the burning of the contact parts by electric arc, significantly improves reliability and electrical life, and can quickly extinguish the arc.

[0006] The present invention achieves its objective as follows: a disconnecting switch includes a housing; a moving contact rod rotatably disposed within the housing; a stationary guide rod and an arc-extinguishing device. The stationary guide rod is positioned on the housing, and the arc-extinguishing device is disposed within the housing. The arc-extinguishing device has a channel formed by the housing on three sides. The stationary guide rod includes a conductive plate extending toward the arc-extinguishing device within the rotation plane of the moving contact rod. The conductive plate has a contact portion extending into the channel and an arc-inducing portion located outside the channel. The moving contact rod contacts or separates from the contact portion within the channel.

[0007] Preferably, an arc-spraying nozzle is formed on the housing at a position corresponding to the channel, and the arc-initiating part is located between the channel and the arc-spraying nozzle.

[0008] Preferably, the static guide rod further includes a conductive rod, one end of which extends into the housing to form a conductive plate mating end, and the other end of which extends out of the housing to form a wiring end. The conductive plate is mated with the conductive plate mating end or is formed by folding at the conductive plate mating end.

[0009] Preferably, the conductive plate is arranged perpendicularly to the mating end of the conductive plate. A first boss and a second boss are formed on one side of the mating end of the conductive plate. A conductive plate embedding rib groove is formed between the first boss and the second boss. A first boss cavity is formed on the conductive plate at a position corresponding to the first boss, and a second boss cavity is formed at a position corresponding to the second boss. The first and second boss cavities are separated by the conductive plate embedding rib. The first boss cavity is fitted with the first boss, the second boss cavity is fitted with the second boss, and the conductive plate embedding rib is fitted with the conductive plate embedding rib groove.

[0010] Preferably, a groove is formed between the contact portion and the arc-starting portion, the groove extending toward the mating end of the conductive plate and biased in a direction away from the terminal to form a U-shaped current path on the conductive rod and the contact portion.

[0011] Preferably, a guide section is formed on the side of the contact portion facing the moving contact rod, and the thickness of the guide section is less than the thickness of the contact portion.

[0012] Preferably, an arc-initiating sharp angle is formed on the side of the arc-initiating portion facing the arc-extinguishing device.

[0013] Preferably, a housing positioning groove is formed in the middle of the conductive rod and at corresponding positions on the front and rear sides, and the static guide rod is positioned on the housing by the housing positioning groove.

[0014] Preferably, the arc-extinguishing device is symmetrically distributed relative to the rotation plane of the moving contact rod. The arc-extinguishing device further includes a magnetic assembly, which includes a central permanent magnet, a pair of side permanent magnets disposed on both sides of the central permanent magnet, and a back magnetic plate connecting the pair of side permanent magnets and the central permanent magnet. The outer shell of the arc-extinguishing device covers the magnetic assembly, which includes a central arc-blocking plate, a pair of arc-blocking plates disposed on both sides of the central arc-blocking plate, and a pair of back plates connecting the pair of arc-blocking plates and the central arc-blocking plate. The channel is formed between the pair of arc-blocking plates, and the central arc-blocking plate divides the side of the channel near the pair of back plates into a pair of arc-blowing slits. The internal magnetic fields of the central permanent magnet and the side permanent magnets are opposite in direction but parallel to the rotation plane of the moving contact rod, so that the electric arc enters one of the arc-blowing slits.

[0015] Preferably, the outer shell of the arc-extinguishing device is made of a gas-generating material, and the back magnetic plate is made of a magnetically conductive material.

[0016] The technical solution provided by this utility model has a conductive plate on the stationary guide rod that extends into the arc-extinguishing device within the rotation plane of the moving contact rod. The conductive plate has a contact portion extending into the channel and an arc-initiating portion located outside the channel. The moving contact rod contacts or separates from the contact portion within the channel, ensuring that the arc is generated and stretched within the channel. Under the action of air blowing and magnetic blowing, the arc jumps from the contact portion to the arc-initiating portion, reducing the burning of the contact portion by the arc, thereby improving the reliability and electrical life of the switch. Furthermore, the arrangement of the arc-initiating portion located outside the channel is more conducive to lengthening the arc and achieving rapid arc extinguishing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the interior of the housing of the disconnect switch of this utility model; Figure 2 This is a schematic diagram of the contact system of the disconnecting switch of this utility model; Figure 3 for Figure 1 and Figure 2 A schematic diagram of the overall structure of the static guide rod is shown. Figure 4 for Figure 1 and Figure 2 The diagram shows an embodiment of the static guide rod where the conductive rod and the conductive plate cooperate. Figure 5 for Figure 1 The diagram shows a detailed structural diagram of the arc-extinguishing device.

[0018] In the diagram: 1. Shell, 11. Arc nozzle; 2. Moving contact rod, 21. Moving contact rod rotating bracket; 3. Stationary guide rod, 31. Conductive rod, 311. Conductive plate mating end, 3111. First boss, 3112. Second boss, 3113. Conductive plate embedded rib groove, 312. Wiring terminal, 313. Shell positioning groove, 32. Conductive plate, 321. Contact part, 3211. Conductive plate first boss cavity, 3212. Conductive plate second boss cavity, 3213. Conductive plate embedded rib, 3214. Inlet section, 3215. Groove, 3216. Inclined surface, 322. Arc ignition part, 3221. Arc ignition part sharp corner; 4. Arc extinguishing device, 40. Channel, 401. Arc blowing slit, 41. Arc extinguishing device shell, 411. 412. Intermediate partition plate, 413. Arc-blocking plate, 42. Back plate, 42. Magnetic assembly, 421. Intermediate permanent magnet, 422. Side permanent magnet, 423. Back magnetic conductive plate, L1. First direction, L2. Second direction, I. Current. Detailed Implementation

[0019] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0020] Since there is one pair of stationary guide rods 3, all directional or orientational concepts involving up, down, left, right, front, and back in the following description will be based on... Figure 1 The position of the stationary guide rod 3 located on the right is taken as the reference, and therefore it should not be construed as a special limitation on the technical solution provided by this utility model.

[0021] Please see Figure 1 and Figure 2 And combined Figure 5 The diagram shows a housing 1, which is generally rectangular in shape. It also shows a pair of movable contact rods rotatably mounted within the housing 1. A rotating support 21 for the movable contact rods is located at the center of the housing 1, meaning the pair of movable contact rods passes through the rotating support 21. The two ends of each movable contact rod extend to the outer circumference of the rotating support 21 and simultaneously contact or separate from a pair of stationary guide rods 3, which will be mentioned later. The diagram also shows a pair of stationary guide rods 3 and an arc-extinguishing device 4. The stationary guide rods 3 are positioned on the housing 1, and the arc-extinguishing device 4 is disposed within the housing 1. The arc-extinguishing device 4 has a channel 40 formed by three sides of an arc-extinguishing device housing 41. Figure 5 Show).

[0022] Please see Figure 3 and Figure 4 And combined Figure 1 The key technical points of the technical solution provided by this utility model are as follows: the aforementioned static guide rod 3 includes a conductive plate 32 extending into the aforementioned arc extinguishing device 4 within the rotation plane of the aforementioned moving contact rod 2. The conductive plate 32 has a contact portion 321 extending into the aforementioned channel 40 and an arc-inducing portion 322 located outside the aforementioned channel 40. The aforementioned moving contact rod 2 contacts or separates from the aforementioned contact portion 321 within the aforementioned channel 40.

[0023] Preferably, by Figure 1 As shown, an arc-spraying nozzle 11 is provided on the aforementioned housing 1 at a position corresponding to the aforementioned channel 40, and the aforementioned arc-inducing part 322 is located between the aforementioned channel 40 and the arc-spraying nozzle 11.

[0024] The aforementioned static guide rod 3 also includes a conductive rod 31. One end of the conductive rod 31 extending inside the aforementioned housing 1 forms a conductive plate mating end 311, while the other end extending outside the housing 1 forms a wiring end 312. The conductive plate 32 is mated with the conductive plate mating end 311 or is folded open at the conductive plate mating end 311. Figure 2 The current I is also indicated by a dashed line.

[0025] The embodiment provided in this utility model is a clamping contact system, in which there is a pair of moving contact rods 2, which are stacked in the rotational axis of the moving contact rods 2, and a gap is provided between the pair of moving contact rods 2. When the moving and stationary contacts are closed, the contact part 321 is embedded in the gap, that is, the contact part 321 is clamped between the pair of moving contacts 2. Since the clamping contact system is conventional technology, it will not be described in detail.

[0026] The conductive plate 32 is arranged perpendicularly to the conductive plate mating end 311, that is, the plane where the conductive plate 32 is located is perpendicular to the plane where the conductive plate mating end 311 is located, and the sides of the conductive plate 32 and the conductive plate mating end 311 are in contact. A first boss 3111 and a second boss 3112 are formed on one side of the aforementioned conductive plate mating end 311. A conductive plate embedding rib groove 3113 is formed between the first and second bosses 3111 and 3112. A conductive plate first boss cavity 3211 is formed on the conductive plate 321 at a position corresponding to the aforementioned first boss 3111, and a conductive plate second boss cavity 3212 is formed at a position corresponding to the aforementioned second boss 3112. The first and second boss cavities 3211 and 3212 are separated by the conductive plate embedding rib 3213. The conductive plate first boss cavity 3211 is fitted with the aforementioned first boss 3111, the conductive plate second boss cavity 3212 is fitted with the aforementioned second boss 3112, and the conductive plate embedding rib 3213 is fitted with the aforementioned conductive plate embedding rib groove 3113. The fitted parts are welded and fixed.

[0027] Depend on Figure 3 and Figure 4 As shown, a groove 3215 is formed between the aforementioned contact portion 321 and the aforementioned arc-starting portion 322. The groove 3215 extends toward the aforementioned conductive plate mating end 311 and is biased in a direction away from the aforementioned wiring end 312, thereby forming a U-shaped current path on the conductive rod 31 and the contact portion 321.

[0028] The aforementioned gap is formed between the ends of the pair of moving contact rods 2 extending to the outer circumference of the moving contact rod rotating support 21. An inlet section 3214 is formed on the side of the aforementioned contact portion 321 facing the aforementioned moving contact rod 2. Figure 4As shown), the thickness of the guide section 3214 is less than the thickness of the contact portion 321. When the aforementioned moving contact rod 2 and the stationary guide rod 3 form a contact tendency, the aforementioned guide section 3214 first enters the gap between a pair of moving contact rods 2, thereby guiding the clamping contact between the next pair of moving contact rods 2 and the contact portion 321.

[0029] The end of the aforementioned arc-inducing part 322, that is, the end facing the arc-extinguishing device 4, is provided with an arc-inducing sharp angle 3221.

[0030] A housing positioning groove 313 is formed in the middle of the conductive rod 31 and at corresponding positions on the front and rear sides. The conductive rod 31 is positioned on the aforementioned housing 1 by the housing positioning groove 313, and the stationary guide rod 3 is thus positioned.

[0031] Please see Figure 5 The aforementioned arc-extinguishing device 4 has a structure symmetrically distributed relative to the rotation plane of the moving contact rod 2. The arc-extinguishing device 4 includes a magnetic assembly 42, which includes a central permanent magnet 421, a pair of side permanent magnets 422 disposed on both sides of the central permanent magnet 421, and a back magnetic guide plate 423 connecting the pair of side permanent magnets 422 and the central permanent magnet 421. The aforementioned arc-extinguishing device housing 41 covers the aforementioned magnetic assembly 42, which includes a central arc-separating plate 411, and a back magnetic guide plate 423 disposed on the central arc-separating plate 411. 1. A pair of arc-blocking plates 412 on both sides and a pair of back plates 413 connecting the pair of arc-blocking plates 412 and the middle partition arc plate 411. The aforementioned channel 40 is formed between the pair of arc-blocking plates 412. The middle partition arc plate 411 divides the side of the channel 40 near the pair of back plates 413 into a pair of arc-blowing slits 401. The aforementioned middle permanent magnet 421 and the side permanent magnet 422 have opposite internal magnetic field directions but are both parallel to the rotation plane of the aforementioned moving contact rod 2, so that the electric arc enters one of the arc-blowing slits 401.

[0032] In this embodiment, the outer shell 41 of the aforementioned arc-extinguishing device is made of gas-generating material, and the aforementioned back magnetic plate 423 is made of magnetic material.

[0033] In another embodiment, the aforementioned conductive plate 32 is folded and unfolded at the conductive plate mating end 311 of the aforementioned conductive rod 31, thus forming an integral structure of the conductive plate 32 and the conductive rod 31.

[0034] When the moving contact rod 2 rotates relative to the housing 1 toward the side away from the stationary guide rod 3, it can cooperate with the stationary guide rod 3 to open the circuit. When the moving contact rod 2 rotates relative to the housing 1 toward the side closer to the stationary guide rod 3, it can cooperate with the stationary guide rod 3 to close the circuit. The aforementioned arc-extinguishing device 4 is located on the side away from the center of rotation of the moving contact along the arc-shaped rotation path of the moving contact. When the switch is open, an arc is generated at the contact part. The arrangement of the contact part 321 within the channel 40 ensures that when the arc is generated within the channel 40, the magnetic field generated by the magnetic circuit composed of the permanent magnet and the magnetic guide plate guides and stretches the arc into one of the arc-extinguishing narrow slits 401. Since the material of the arc-extinguishing device housing 41 can be a non-magnetic material that generates gas and is arc-resistant, the gas generated by the arc increases the internal gas pressure of the arc-extinguishing device. Furthermore, due to the arc-spraying nozzle 11 on the housing 1, a pressure difference is generated between the inside of the arc-extinguishing device 4 and the arc-spraying nozzle 11, causing the arc to bend towards the arc-spraying nozzle 11. Since the arc-initiating part 322 of the stationary guide rod 3 is located between the arc-extinguishing device 4 and the arc-spraying nozzle 11, the bent arc jumps towards the arc-initiating part, thereby reducing the burning of the contact part and improving the service life of the switch. Moreover, the arrangement of the arc-initiating part 312 outside the channel 40 is more conducive to lengthening the arc and achieving rapid arc extinguishing. Furthermore, since a groove 3215 is provided between the aforementioned contact part 321 and the arc-initiating part 322, the aforementioned groove 3215 causes the current flowing through the stationary contact to form a... Figure 2 The U-shaped current path shown constitutes a magnetic blowout effect, which accelerates the bending of the electric arc toward the nozzle 11, making it more conducive to lengthening the electric arc.

[0035] Because the end of the aforementioned arc-initiating part 322 forms a sharp angle 3221, the electric field strength of the equipotential body will concentrate at the sharp angle. Therefore, the arc root is more likely to stay at the sharp angle of the arc-initiating part 322 where the electric field strength is concentrated. This structural design makes it easier for the arc on the contact part 321 to jump to the arc-initiating part 322. Since an inlet section 3214 is formed on the side of the aforementioned arc-initiating part 322 facing the moving contact rod 2, and the thickness of the inlet section conductor of the inlet section 3214 is less than the thickness of the conductor of the conductive plate 32, when the moving contact rod 2 is about to contact the stationary guide rod 3, as mentioned above, the inlet section 3214 first enters the gap formed between the contact ends of the pair of moving contact rods 2 extending to the outer circumference of the moving contact rod rotating support 21, ensuring smooth contact between the moving and stationary contacts.

[0036] Since one side of the contact portion 321 is provided with a slope 3216 to form a slope transition section, when the moving contact rod 2 and the stationary guide rod 3 separate, the slope transition section separates from the moving contact first compared with other parts of the contact portion 321, so that the area on the contact portion 321 that generates an electric arc is close to the arc-initiating portion 322, which is conducive to the electric arc jumping towards the arc-initiating portion 322.

[0037] See Figure 2When the stationary guide rod 3 does not include the arc-initiating part 322, the arc is drawn along the first direction L1; when the stationary guide rod 3 includes the arc-initiating part 322, the arc is drawn along the second direction L2 due to the presence of the arc-initiating part 322. In this way, on the one hand, after the arc jumps from the contact part of the stationary guide rod 3 to the arc-initiating part 322, the burning of the contact part by the arc is reduced, thereby improving the life of the switch. On the other hand, the length of the arc is increased, improving the arc extinguishing capability.

[0038] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A disconnecting switch, comprising a housing (1); a moving contact rod (2) rotatably disposed within the housing (1); a stationary guide rod (3); and an arc-extinguishing device (4), the stationary guide rod (3) being positioned on the housing (1), the arc-extinguishing device (4) being disposed within the housing (1), and the arc-extinguishing device (4) having a channel (40) formed by three sides of an arc-extinguishing device housing (41), characterized in that: The stationary guide rod (3) includes a conductive plate (32) extending toward the arc-extinguishing device (4) in the rotation plane of the moving contact rod (2). The conductive plate (32) has a contact portion (321) extending into the channel (40) and an arc-inducing portion (322) located outside the channel (40). The moving contact rod (2) contacts or separates from the contact portion (321) in the channel (40).

2. The disconnecting switch according to claim 1, characterized in that: An arc nozzle (11) is provided on the housing (1) at a position corresponding to the channel (40), and the arc-inducing part (322) is located between the channel (40) and the arc nozzle (11).

3. The disconnecting switch according to claim 1, characterized in that: The static guide rod (3) also includes a conductive rod (31). One end of the conductive rod (31) extending into the housing (1) is configured as a conductive plate mating end (311), and the other end of the conductive rod (31) extending out of the housing (1) is configured as a wiring end (312). The conductive plate (32) is mated with the conductive plate mating end (311) or is formed by folding at the conductive plate mating end (311).

4. A disconnecting switch according to claim 3, characterized in that: The conductive plate (32) is arranged perpendicularly to the conductive plate mating end (311). A first boss (3111) and a second boss (3112) are formed on one side of the conductive plate mating end (311). A conductive plate embedding rib groove (3113) is formed between the first and second bosses (3111, 3112). A conductive plate first boss embedding cavity (3211) is formed on the conductive plate (32) at a position corresponding to the first boss (3111). The position of the second protrusion (3112) forms a conductive plate second protrusion cavity (3212). The first and second protrusion cavities (3211, 3212) are separated by a conductive plate embedding rib (3213). The conductive plate first protrusion cavity (3211) is fitted with the first protrusion (3111), the conductive plate second protrusion cavity (3212) is fitted with the second protrusion (3112), and the conductive plate embedding rib (3213) is fitted with the conductive plate embedding rib groove (3113).

5. A disconnecting switch according to claim 3, characterized in that: A groove (3215) is formed between the contact portion (321) and the arc-starting portion (322). The groove (3215) extends toward the conductive plate mating end (311) and is biased in a direction away from the terminal (312) to form a U-shaped current path on the conductive rod (31) and the contact portion (321).

6. A disconnecting switch according to claim 1, characterized in that: An inlet section (3214) is formed on the side of the contact portion (321) facing the movable contact rod (2), and the thickness of the inlet section (3214) is less than the thickness of the contact portion (321).

7. A disconnecting switch according to claim 1, characterized in that: An arc-inducing sharp corner (3221) is formed on the side of the arc-inducing part (322) facing the arc-extinguishing device (4).

8. A disconnecting switch according to claim 3, characterized in that: A housing positioning groove (313) is formed in the middle of the conductive rod (31) and at corresponding positions on the front and rear sides, and the static guide rod (3) is positioned on the housing (1) by the housing positioning groove (313).

9. A disconnecting switch according to claim 1, characterized in that: The arc-extinguishing device (4) is symmetrically distributed with respect to the rotation plane of the moving contact rod (2). The arc-extinguishing device (4) also includes a magnetic assembly (42), which includes a central permanent magnet (421), a pair of side permanent magnets (422) disposed on both sides of the central permanent magnet (421), and a back magnetic plate (423) connecting the pair of side permanent magnets (422) and the central permanent magnet (421). The outer shell (41) of the arc-extinguishing device covers the magnetic assembly (42), which includes a central arc-separating plate (411) and a back magnetic plate (423) disposed on the central arc-separating plate (411). A pair of arc-blocking plates (412) on both sides and a pair of back plates (413) connecting the pair of arc-blocking plates (412) and the middle partition arc plate (411), the channel (40) is formed between the pair of arc-blocking plates (412), and the middle partition arc plate (411) divides the side of the channel (40) near the pair of back plates (413) into a pair of arc-blowing slits (401); the internal magnetic field direction of the middle permanent magnet (421) and the side permanent magnet (422) is opposite but parallel to the rotation plane of the moving contact rod (2) so that the electric arc enters one of the arc-blowing slits (401).

10. A disconnecting switch according to claim 9, characterized in that: The outer shell (41) of the arc extinguishing device is made of gas-generating material, and the back magnetic plate (423) is made of magnetic material.

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