Multi-contact magnetic arc extinguishing structure

Abstract

The utility model discloses a kind of multi-contact magnetic blow arc extinguishing structure, including base assembly, arc separation chamber and blow arc magnetic steel, the blow arc magnetic steel is detachably installed in arc separation chamber, and arc separation chamber and base assembly are slidably connected and clamped fixedly to form arc extinguishing structure, the base assembly and arc separation chamber are equipped with the arc separation grid corresponding to position, and arc extinguishing structure is assembled to the relay, and arc separation grid divides every group of contact of relay into separate arc separation space after the relay.The utility model can provide blow arc magnetic field and arc separation chamber for snap relay, accelerate to extinguish arc generated in the process of breaking large current load of relay, improve the load capacity of relay;Arc separation chamber and base assembly are simple and firm to install, reach the effect of limit stable, and the volume of blow arc magnetic steel is flexible and variable, different types of blow arc magnetic steel can be selected according to use environment, so that the load performance of relay can meet more application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of relay magnetic blowout arc extinguishing technology, specifically a multi-contact magnetic blowout arc extinguishing structure. Background Technology

[0002] Currently, magnetic blowout arc extinguishing structures are mostly used in high-power relays in fields such as new energy, power grids, and aerospace. Snap-action relays rarely incorporate magnetic blowout arc extinguishing structures. High-power relays, due to their large breaking voltage and high operating speed requirements, are mostly direct-acting structures, and typically have one or two sets of normally open contacts.

[0003] In many practical applications, such as industrial control and rail transportation, relays are used to control signal switching, requiring them to have multiple sets of contacts to facilitate the control and feedback of multiple signals. Multi-contact relays are mostly of the snap-action or balanced armature type electromagnetic structure, offering flexible contact configurations. Although their operating speed is slower than direct-acting relays, their performance is sufficient for most applications. However, due to the complex contact structure, diverse contact types, and limited internal space, multi-contact relays rarely feature magnetic blowout extinguishing mechanisms. This limits their load-carrying capacity, restricting their application to low-current scenarios. The few multi-contact relays that do feature magnetic blowout extinguishing mechanisms suffer from cumbersome component assembly and limitations in increasing the size of the blowout magnet due to structural constraints, thus hindering the improvement of magnetic field strength. Utility Model Content

[0004] In view of the above-mentioned shortcomings and deficiencies, this utility model provides a multi-contact magnetic blowout arc extinguishing structure, which can provide an arc-blowing magnetic field and an arc-isolating device for a snap-action relay, accelerate the extinguishing of the arc generated by the relay during the interruption of a large current load, and improve the load-carrying capacity of the relay.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A multi-contact magnetic blowout arc extinguishing structure includes a base assembly, an arc-isolating chamber, and an arc-blowing magnet. The arc-blowing magnet is detachably installed in the arc-isolating chamber. The arc-isolating chamber is slidably connected to the base assembly and snap-fitted to form the arc extinguishing structure. The base assembly and the arc-isolating chamber are provided with corresponding arc-isolating grids. After the arc extinguishing structure is assembled to the relay, the arc-isolating grids divide each group of contacts of the relay into a separate arc-isolating space.

[0007] The arc-isolating chamber includes an arc-shaped plate and a U-shaped plate connected thereto. A rectangular groove is provided on one side of the arc-shaped plate, which together with the U-shaped plate forms a rectangular hollow for installing the arc-blowing magnet. The inner sides of the rectangular groove and the corresponding U-shaped plate are provided with protrusions.

[0008] The arc radius of the arc plate is determined according to the relay coil. An arc barrier is provided on one side of the arc plate, and a buckle is provided on one side of the U-shaped plate. The edges of the barbed part of the buckle are rounded.

[0009] The base assembly has a groove in the middle, and a slot that engages with the arc-isolating chamber is provided in the groove. The end of the slot is chamfered. Guide grooves that slide with the arc-isolating chamber are provided on both sides of the groove, and a base arc-isolating grid corresponding to the arc-isolating grid of the arc-isolating chamber is provided.

[0010] The base assembly has two openings between each of the two adjacent arc-blocking grids for the contact group to pass through.

[0011] The base arc-blocking grid and the base assembly are integrally injection molded, and both the base assembly and the arc-blocking chamber are made of high-temperature resistant plastic material.

[0012] This utility model has the following beneficial effects and advantages:

[0013] This utility model's multi-contact relay magnetic blowout arc-extinguishing structure provides a blowing magnetic field and an arc-isolating chamber for snap-action relays, accelerating the extinguishing of the arc generated during the interruption of high-current loads and improving the relay's load-carrying capacity. The arc-isolating chamber and base assembly are simple and robust to install, achieving a stable limiting effect. Furthermore, the blowout magnet's volume is flexible and variable, allowing for the selection of different types of blowout magnets according to the application environment, enabling the relay's load-carrying performance to meet a wider range of application scenarios. Simultaneously, the assembly of the blowout magnet and arc-isolating chamber with the relay is simple and reliable, avoiding the cumbersome assembly steps and repeated positioning required in some existing relay blowout structures, thus improving product consistency and manufacturability during the relay manufacturing process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the magnetic blowout arc extinguishing mechanism of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the base assembly of this utility model;

[0016] Figure 3 This is a schematic diagram of the guide groove structure of the base assembly of this utility model;

[0017] Figure 4 This is a cross-sectional schematic diagram of the base assembly of this utility model;

[0018] Figure 5 This is a schematic diagram of the arc-isolating chamber of this utility model;

[0019] Figure 6 This is a schematic diagram of the snap-fit ​​structure of the arc-isolating chamber of this utility model;

[0020] Figure 7 This is a schematic diagram of the assembly of the arc-isolating chamber and the arc-blowing magnet of this utility model;

[0021] Figure 8 This is a schematic diagram of the assembly process of the arc-isolating chamber and the base assembly of this utility model;

[0022] Figure 9 This is a schematic diagram of the relay assembly.

[0023] Figure 10 This is a schematic diagram of the relay magnetic circuit.

[0024] Figure 11 This is a schematic diagram of the magnetic circuit and base assembly.

[0025] Among them, 11 is the base assembly, 11a is the guide groove, 11b is the slot, 11c is the top groove, 11d is the base arc-blocking grid, and 11e is the contact group; 12 is the arc-blocking chamber, 12a is the U-shaped plate, 12b is the buckle, 12c is the arc plate, 12d is the convex hull, and 12e is the arc-blocking grid; 13 is the arc-blowing magnet; 21 is the moving contact plate assembly, 22 is the coil, 23 is the yoke; and 31 is the screw. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings. Figure 1 As shown, this utility model is a multi-contact magnetic blowout arc extinguishing structure, including a base assembly 11, an arc-isolating chamber 12, and an arc-blowing magnet 13. The arc-blowing magnet 13 is detachably installed in the arc-isolating chamber 12. The arc-isolating chamber 12 is slidably connected to the base assembly 11 and snap-fitted to form an arc extinguishing structure. The base assembly 11 is provided with a base arc-isolating grid 11d, and the arc-isolating chamber 12 is provided with an arc-isolating grid 12e corresponding to the position of the base arc-isolating grid 11d. After the arc extinguishing structure is assembled to the relay, the arc-isolating grid divides each group of contacts of the relay into a separate arc-isolating space. The base arc-isolating grid 11d and the base assembly 11 are integrally injection molded. Both the base assembly 11 and the arc-isolating chamber 12 are made of high-temperature resistant plastic material, which can prevent contact arc erosion and has a certain elasticity to facilitate assembly.

[0027] Specifically, such as Figures 2-4 As shown, each of the two adjacent arc-isolating grids 12e of the base assembly 11 has two openings for the contact group 12e to pass through. The base assembly 11 is provided with a base arc-isolating grid 11d corresponding to the arc-isolating grids 12e of the arc-isolating chamber 12, which provides three-sided arc isolation for the contact group 11e in the base assembly 11. The base arc-isolating grid 11d and the base 11 are integrally injection molded using thermosetting plastic material, which can withstand high temperatures while ensuring the molding size and strength of the parts, preventing the contact arc from burning the base during the relay's load interruption process.

[0028] The base assembly 11 has a groove in the middle, and a slot 11b that engages with the buckle 12b of the arc-isolating chamber 12 is provided in the groove. The end of the slot 11b has a chamfered structure. Guide grooves 11a that slide and connect with the arc-isolating chamber 12 are provided on both sides of the groove. The opening of the guide groove 11a has a chamfered structure to facilitate the initial positioning of the arc-isolating chamber 12 during insertion.

[0029] More specifically, such as Figure 1 , 5 As shown in Figure 6, the arc-isolating chamber 12 includes an arc-shaped plate 12c and a U-shaped plate 12a connected thereto. The arc-shaped plate 12c is designed with an arc-shaped structure to avoid interference with the relay coil. A rectangular groove is provided on one side of the arc-shaped plate 12c, which, together with the U-shaped plate 12a, forms a rectangular cutout for installing the arc-blowing magnet. Both the rectangular groove and the corresponding U-shaped plate 12a have protrusions 12d on their inner sides.

[0030] The convex hull 12d is a limiting structure that fixes the arc-isolating chamber 12 and the arc-blowing magnet 12. By changing the size of the convex hull 12d, the arc-isolating chamber 12 can be adapted to arc-blowing magnets of different sizes, thereby providing the relay with different arc-blowing magnetic field strengths, enabling the relay to meet the application needs of more scenarios.

[0031] The arc curvature of the arc plate 12c is determined according to the coil 22 of the relay. An arc-blocking grid 12e is provided on one side of the arc plate 12c, and a buckle 12b is provided on one side of the U-shaped plate. The edge of the barb part of the buckle 12b is rounded to avoid edge damage during assembly. At the same time, the rounded corner structure also helps the barb slide down to the bottom of the final arc-blocking chamber slot 11b.

[0032] like Figure 7-8 As shown, the arc-blowing magnet 13 has a square structure and is placed in the rectangular slot of the arc-isolating chamber 12 to cooperate with it. Then, it is inserted into the base assembly 11 together with the arc-isolating chamber 12.

[0033] like Figure 9-10 As shown, the moving contact piece assembly 21 in the relay magnetic circuit assembly is in contact with the contact group 11e in the base assembly 11, and the arc surface of the arc isolation chamber 12 faces the coil 22, which serves to protect the coil 22.

[0034] like Figure 11 As shown, the relay magnetic circuit assembly and the base assembly 11 are fixedly connected by two screws to form the complete relay unit.

[0035] When using this utility model, the arc-blowing magnet 13 is first inserted into the rectangular groove of the arc-isolating chamber 12. The two ends of the pole face of the arc-blowing magnet 13 are aligned with the rectangular groove of the arc-isolating chamber 12. The six protrusions 12d are slightly interference-fitted with the arc-blowing magnet 13 so that the arc-blowing magnet 13 will not fall out of the arc-isolating chamber 12 after it is positioned.

[0036] The arc-isolating chamber 12 with the arc-blowing magnet 13 is then inserted into the base assembly 11.

[0037] The base arc-isolating grid 11d of the base assembly 11 isolates the four groups of contacts separately, realizing electrical isolation between the contacts of each group of relays, so that each group of contacts does not affect each other during the process of breaking the arc.

[0038] The arc-isolating chamber 12 is inserted downward from the top of the base assembly 11. The arc-isolating chamber U-shaped plate 12a slides downward along the guide groove 11a of the base assembly 11, and then the arc-isolating chamber buckle 12b contacts the arc-isolating chamber slot 11b. Since the top surface of the arc-isolating chamber slot 11b has a chamfered structure and the arc-isolating chamber 12 parts as a whole have a certain degree of elasticity, the barbed bevel and barbed rounded corner of the arc-isolating chamber buckle 12b can forcefully pass through the arc-isolating chamber slot 11b under the action of external force.

[0039] After the arc-isolation chamber buckle 12b passes through the arc-isolation chamber slot 11b, the arc-isolation chamber 12 component elastically resets, and the barbed surface of the arc-isolation chamber buckle 12b engages with the bottom surface of the arc-isolation chamber slot 11b, thereby fixing the arc-isolation chamber buckle 12b in place. After the position of the arc-isolation chamber buckle 12b is fixed, the upper end of the arc-isolation chamber arc plate 12c contacts the arc-isolation chamber top groove 11c of the base assembly 11, thereby achieving the upper and lower limit of the arc-isolation chamber 12 in the base assembly 11.

[0040] Meanwhile, since the arc-isolating chamber 12 slides along the arc-isolating chamber guide groove 11a on both sides of the base assembly 11, the arc-isolating chamber guide groove 11a limits the arc-isolating chamber 12 in four directions (front, back, left, and right). Therefore, when the arc-isolating chamber buckle 12b and the arc-isolating chamber slot 11b are properly engaged, the arc-isolating chamber 12 is limited in all directions by the base assembly 11, and the arc-isolating chamber 12 can be firmly fixed on the base assembly 11.

[0041] The arc-blocking grid 12e and the base arc-blocking grid 11d are flush after the arc-blocking chamber 12 and the base 11 are assembled, together dividing each group of contacts into a separate arc-blocking space. The arc-shaped structure of the arc-blocking chamber 12 avoids the risk of coil interference, guides the arc moving under the influence of the arc-blowing magnetic field to the outside of the relay, increases the arc length, accelerates the arc extinguishing, and prevents the arc from burning other internal components of the relay.

[0042] The yoke 23 in the relay magnetic circuit assembly has two threaded through holes. The magnetic circuit assembly and the base assembly 11 are fixed by two round-headed Phillips screws 31 passing through the two through holes on the base assembly 11 and engaging with the two threaded holes on the yoke 23, thereby completing the assembly of the entire relay.

[0043] The tail of the moving contact assembly 21 is soldered to one end of the wire, and the other end of the wire is soldered to the corresponding terminal in the base assembly 11, so that the external signal can flow to the moving contact assembly through the terminal of the base assembly 11, thereby forming a circuit between the moving contact assembly 21 and the contact group 11e in the base assembly 11 to connect or disconnect the external signal.

[0044] After the entire machine is assembled, the arc surface of the arc-isolating chamber 12 faces the coil 22. The arc surface design prevents the arc-isolating chamber 12 from interfering with the coil 22 after assembly, and also blocks the electric arc that is stretched to the inside and outside sides under the magnetic force of the arc-blowing magnet 13 during the relay arcing process, thus preventing the electric arc from burning the coil during the relay arcing process.

[0045] The arc-blowing magnet operates on the principle that the arc-blowing magnet 13 will generate a magnetic field around itself from the N pole to the S pole. When the relay contact group breaks the load and generates an arc, the current carried by the arc will generate a Lorentz force against the base assembly 11 under the action of the arc-blowing magnet's magnetic field. Therefore, the arc will move in the direction away from the base under the action of the Lorentz force, and the arc length will increase, thereby increasing its contact cooling area with the air and accelerating the extinguishing speed of the arc.

Claims

1. A multi-contact magnetic blowout arc extinguishing structure, characterized in that: The device includes a base assembly, an arc-isolating chamber, and an arc-blowing magnet. The arc-blowing magnet is detachably installed in the arc-isolating chamber. The arc-isolating chamber is slidably connected to the base assembly and snap-fitted to form an arc-extinguishing structure. The base assembly and the arc-isolating chamber are provided with corresponding arc-isolating grids. After the arc-extinguishing structure is assembled to the relay, the arc-isolating grids divide each group of contacts of the relay into a separate arc-isolating space.

2. The multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: The arc-isolating chamber includes an arc-shaped plate and a U-shaped plate connected thereto. A rectangular groove is provided on one side of the arc-shaped plate, which together with the U-shaped plate forms a rectangular hollow for installing the arc-blowing magnet. The inner sides of the rectangular groove and the corresponding U-shaped plate are provided with protrusions.

3. The multi-contact magnetic blowout arc extinguishing structure according to claim 2, characterized in that: The arc radius of the arc plate is determined according to the relay coil. An arc barrier is provided on one side of the arc plate, and a buckle is provided on one side of the U-shaped plate. The edges of the barbed part of the buckle are rounded.

4. The multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: The base assembly has a groove in the middle, and a slot that engages with the arc-isolating chamber is provided in the groove. The end of the slot is chamfered. Guide grooves that slide with the arc-isolating chamber are provided on both sides of the groove, and a base arc-isolating grid corresponding to the arc-isolating grid of the arc-isolating chamber is provided.

5. The multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: The base assembly has two openings between each of the two adjacent arc-blocking grids for the contact group to pass through.

6. The multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: The base arc-blocking grid and the base assembly are integrally injection molded, and both the base assembly and the arc-blocking chamber are made of high-temperature resistant plastic material.

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