Multi-contact magnetic quenching structure

Abstract

A multi-contact magnetic quenching structure disclosed by the present invention comprises a base assembly, an arc-isolating chamber and arc-blowing magnetic steel, the arc-blowing magnetic steel is detachably installed in the arc-isolating chamber, the arc-isolating chamber and the base assembly are slidably connected and fixedly clamped to form an arc quenching structure, and the base assembly and the arc-isolating chamber are provided with arc-isolating grids at corresponding positions. And after the arc extinguishing structure is assembled to the relay, each group of contacts of the relay are divided into independent arc isolating spaces by the arc isolating gate. According to the invention, an arc blow-out magnetic field and an arc isolation chamber can be provided for the clapper type relay, arc generated by the relay in the process of breaking a large-current load is accelerated to be extinguished, and the on-load capacity of the relay is improved; the arc isolation chamber and the base assembly are installed simply and firmly, the stable limiting effect is achieved, the size of the arc blowing magnetic steel is flexible and variable, different types of arc blowing magnetic steel can be selected according to the use environment, and the load performance of the relay can meet more application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of relay magnetic blowout arc extinguishing, and specifically to a multi-contact magnetic blowout arc extinguishing structure. Background Art

[0002] At present, the relay magnetic blowout arc extinguishing structure is mostly applied to high-power relays in the fields of new energy, power grid, aerospace, etc. There is rarely a magnetic blowout arc extinguishing structure in the clapper-type relay. Due to the large breaking voltage and high requirements for the relay action speed of high-power relays, they are mostly direct-acting structures, and the number and type of carried contacts are mostly one or two sets of normally open contacts.

[0003] In many actual usage scenarios, such as the industrial control field, the rail transit field, etc., the relay is used to control the on-off of signals, and it is required that the relay has multiple sets of contacts to facilitate the control and feedback of multiple sets of signals. The multi-contact relay mostly has a clapper-type or balanced armature electromagnetic structure, and its contact configuration is flexible. Although the action speed is slower than that of the direct-acting relay, the performance is sufficient to meet most application scenarios. However, due to reasons such as the complex contact structure, diverse contact types, and limited internal space of the multi-contact relay, there are very few magnetic blowout arc extinguishing structures configured, which also makes it difficult to improve the load-carrying capacity of the multi-contact relay, and it can only be applied to working scenarios with small currents. There are also problems with a few multi-contact relays configured with magnetic blowout arc extinguishing structures, such as the cumbersome and complex assembly of parts, and the volume of the arc-blowing permanent magnet is difficult to increase due to the structure, thus unable to improve the magnetic field strength. Summary of the Invention

[0004] In view of the above-mentioned disadvantages and deficiencies, the present invention provides a multi-contact magnetic blowout arc extinguishing structure, which can provide an arc-blowing magnetic field and an arc isolation device for the clapper-type relay, accelerate the extinguishing of the arc generated during the breaking of the large-current load by the relay, and improve the load-carrying capacity of the relay.

[0005] In order to achieve the above purpose, the main technical solutions adopted by the present invention include: A multi-contact magnetic blowout arc extinguishing structure, including a base assembly, an arc isolation chamber, and an arc-blowing permanent magnet. The arc-blowing permanent magnet is detachably installed in the arc isolation chamber. The arc isolation chamber is slidably connected to the base assembly and is clamped and fixed to form an arc extinguishing structure. The base assembly and the arc isolation chamber are provided with arc isolation grids corresponding in position. After the arc extinguishing structure is assembled to the relay, the arc isolation grids divide each group of contacts of the relay into separate arc isolation spaces.

[0006] The arc isolation chamber includes an arc-shaped plate and a U-shaped plate connected thereto. A rectangular groove is opened on one side of the arc-shaped plate, and together with the U-shaped plate, it forms a rectangular hollow for installing the arc-blowing permanent magnet. Convex protrusions are provided on the inner sides of the rectangular groove and the corresponding U-shaped plate.

[0007] The arc radian of the arc-shaped plate is determined according to the coil of the relay. An arc isolation grid is provided on one side of the arc-shaped plate, and a buckle is provided on one side of the U-shaped plate. The edge of the barb part of the buckle is a rounded corner structure.

[0008] A groove is provided in the middle of the base assembly. A clamping groove that cooperates with the buckle of the arc isolation chamber is provided in the groove, and the end of the clamping groove is a chamfered structure; guide grooves that are slidably connected to the arc isolation chamber are provided on both sides of the groove, and a base arc isolation grid corresponding to the arc isolation grid of the arc isolation chamber is provided.

[0009] Two openings for passing through the contact group are provided between every two adjacent arc isolation grids of the base assembly.

[0010] The base arc isolation grid and the base assembly are integrally injection-molded, and both the base assembly and the arc isolation chamber are made of high-temperature resistant plastic materials.

[0011] The present invention has the following beneficial effects and advantages: The multi-contact relay magnetic blowout arc structure of the present invention can provide a blowout magnetic field and an arc isolation chamber for the clapper relay, accelerate the extinguishing of the arc generated during the breaking of a large current load by the relay, and improve the load-carrying capacity of the relay. The installation of the arc isolation chamber and the base assembly is simple and firm, achieving the effect of stable positioning. Moreover, the volume of the blowout magnetic steel is flexibly variable, and different types of blowout magnetic steels can be selected according to the use environment, enabling the load-carrying performance of the relay to meet more application scenarios. At the same time, the assembly of the blowout magnetic steel and the arc isolation chamber with the relay is simple and reliable, avoiding the problems of cumbersome steps and repeated positioning during the assembly of the blowout arc structures of some existing relays, and improving the product consistency and processability of the relay during the production process. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall contact magnetic blowout arc structure of the present invention; Figure 2 It is a schematic diagram of the structure of the base assembly of the present invention; Figure 3 It is a schematic diagram of the structure of the guide groove of the base assembly of the present invention; Figure 4 It is a schematic sectional view of the base assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the arc isolation chamber of the present invention; Figure 6 It is a schematic diagram of the buckle structure of the arc isolation chamber of the present invention; Figure 7 It is a schematic diagram of the assembly of the arc isolation chamber and the blowout magnetic steel of the present invention; Figure 8 It is a schematic diagram of the assembly process of the arc isolation chamber and the base assembly of the present invention; Figure 9 It is a schematic diagram of the overall assembly of the relay; Figure 10It is a schematic diagram of the magnetic circuit part of the relay; Figure 11 It is a schematic diagram of the assembly of the magnetic circuit and the base assembly; Figure 12 It is a schematic diagram of the arc-blowing principle.

[0013] Among them, 11 is the base assembly, 11a is the guide groove, 11b is the card slot, 11c is the top groove, 11d is the base arc barrier, 11e is the contact group; 12 is the arc chamber, 12a is the U-shaped plate, 12b is the buckle, 12c is the arc-shaped plate, 12d is the convex hull, 12e is the arc barrier; 13 is the arc-blowing magnet; 21 is the moving contact piece assembly, 22 is the coil, 23 is the yoke; 31 is the screw. Specific implementation mode

[0014] The present invention will be further described below in conjunction with the accompanying drawings of the specification. As Figure 1 shown, the present invention is a multi-contact magnetic arc extinguishing structure, including a base assembly 11, an arc chamber 12 and an arc-blowing magnet 13. The arc-blowing magnet 13 is detachably installed in the arc chamber 12. The arc chamber 12 is slidably connected to the base assembly 11 and fixedly connected by clamping to form an arc extinguishing structure. The base assembly 11 is provided with a base arc barrier 11d, and the arc chamber 12 is provided with an arc barrier 12e corresponding to the position of the base arc barrier 11d. After the arc extinguishing structure is assembled to the relay, the arc barriers divide each group of contacts of the relay into separate arc isolation spaces. The base arc barrier 11d and the base assembly 11 are integrally injection-molded. Both the base assembly 11 and the arc chamber 12 are made of high-temperature resistant plastic materials, which can prevent the contact arc from burning and have a certain elasticity for easy assembly.

[0015] Specifically, as Figures 2 - 4 shown, two openings for passing through the contact group 12e are provided between adjacent two arc barriers 12e of the base assembly 11. The base assembly 11 is provided with a base arc barrier 11d corresponding to the arc barrier 12e of the arc chamber 12 to conduct three-sided arc isolation on the contact group 11e in the base assembly 11. The base arc barrier 11d and the base 11 are integrally injection-molded and made of thermosetting plastic material, which can withstand high temperature while ensuring the molding size and part strength, and prevent the contact arc from burning the base during the process of the relay breaking the load.

[0016] A groove is provided in the middle of the base assembly 11, and a card slot 11b that cooperates with the buckle 12b of the arc chamber 12 is provided in the groove. The end of the card slot 11b is a chamfered structure; guide grooves 11a that are slidably connected to the arc chamber 12 are provided on both sides of the groove, and the mouth of the guide groove 11a is designed with a chamfered structure to facilitate positioning during the initial stage of inserting the arc chamber 12.

[0017] More specifically, as Figure 1 、 5As shown in Figures 6, the arc isolation chamber 12 includes an arc-shaped plate 12c and a U-shaped plate 12a connected thereto. The arc-shaped plate 12c is designed as 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 forms a rectangular hollow with the U-shaped plate 12a for installing the arc-blowing magnet. Convex protrusions 12d are provided on the inner sides of the corresponding rectangular groove and the U-shaped plate 12a.

[0018] The convex protrusions 12d are the limiting structures for fixing the arc isolation chamber 12 and the arc-blowing magnet 12. By changing the size of the convex protrusions 12d, the arc isolation chamber 12 can be adapted to arc-blowing magnets of different sizes, thereby providing different arc-blowing magnetic field intensities for the relay, enabling the relay to meet the application requirements of more scenarios.

[0019] The arc radian of the arc-shaped plate 12c is determined according to the coil 22 of the relay. An arc isolation grid 12e is provided on one side of the arc-shaped plate 12c, and a buckle 12b is provided on one side of the U-shaped plate. The edge of the barbed part of the buckle 12b is a rounded corner structure, which avoids edge damage during the assembly process. At the same time, the rounded corner structure also helps the barbs to slide down to the bottom of the final arc isolation chamber card slot 11b.

[0020] As Figures 7 - 8 shown, the arc-blowing magnet 13 is a square structure, which is placed in the rectangular groove of the arc isolation chamber 12 for cooperation, and then inserted into the base assembly 11 together with the arc isolation chamber 12.

[0021] As Figures 9 - 10 shown, in the relay magnetic circuit assembly, the moving contact piece assembly 21 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, playing a role in protecting the coil 22.

[0022] As Figure 11 shown, the relay magnetic circuit assembly and the base assembly 11 are fixedly connected by two screws to form the whole relay.

[0023] When the present invention is in use, first, the arc-blowing magnet 13 is inserted into the rectangular groove of the arc isolation chamber 12. The two ends of the pole surface of the arc-blowing magnet 13 are aligned with the rectangular groove of the arc isolation chamber 12. The 6 convex protrusions 12d are slightly interference-fitted with the arc-blowing magnet 13, so that the arc-blowing magnet 13 will not fall off from the arc isolation chamber 12 during the subsequent assembly process after being positioned.

[0024] Subsequently, the arc isolation chamber 12 with the arc-blowing magnet 13 is inserted into the base assembly 11.

[0025] The base arc isolation grid 11d of the base assembly 11 separately isolates the four groups of contacts, realizing the electrical isolation between the contact groups of the relay, so that the contact groups do not affect each other during the process of breaking the arc.

[0026] The arc separation chamber 12 is inserted downward from the top of the base assembly 11. The U-shaped plate 12a of the arc separation chamber slides downward along the guide groove 11a of the base assembly 11. Subsequently, the arc separation chamber buckle 12b contacts the arc separation chamber slot 11b. Since the top surface of the arc separation chamber slot 11b is a chamfered structure and the whole part of the arc separation chamber 12 has a certain elasticity, the barb inclined plane and barb fillet of the arc separation chamber buckle 12b can be forced to pass through the arc separation chamber slot 11b under the action of an external force.

[0027] After the arc separation chamber buckle 12b passes through the arc separation chamber slot 11b, the part of the arc separation chamber 12 elastically resets, and the barb plane of the arc separation chamber buckle 12b cooperates with the bottom plane of the arc separation chamber slot 11b, so that the arc separation chamber buckle 12b is fixed. After the position of the arc separation chamber buckle 12b is fixed, the upper end of the arc-shaped plate 12c of the arc separation chamber contacts the arc separation chamber top slot 11c of the base assembly 11, thereby realizing the up and down limit of the arc separation chamber 12 in the base assembly 11.

[0028] At the same time, since both sides of the arc separation chamber 12 slide along the arc separation chamber guide groove 11a of the base assembly 11, the arc separation chamber guide groove 11a limits the arc separation chamber 12 in the front, rear, left and right directions. Therefore, when the arc separation chamber buckle 12b is in place in cooperation with the arc separation chamber slot 11b, the arc separation chamber 12 is limited in all directions by the base assembly 11, and the arc separation chamber 12 can be firmly fixed on the base assembly 11.

[0029] The arc separation grid 12e and the base arc separation grid 11d are in a flush position after the arc separation chamber 12 and the base 11 are assembled, and together separate each group of contacts into separate arc separation spaces. The arc separation chamber 12 has a circular arc structure, which can guide the arc moving under the influence of the arc blowing magnetic field to the outside of the relay while avoiding the risk of coil interference, increasing the arc drawing length to accelerate the arc extinction, and preventing the arc from burning other components inside the relay.

[0030] There are two threaded through holes on the yoke iron 23 of the relay magnetic circuit assembly. The magnetic circuit assembly and the base assembly 11 are fixed by two round head cross screws 31 passing through the two through holes on the base assembly 11 and cooperating with the two threaded holes on the yoke iron 23, thus completing the assembly of the whole relay.

[0031] The tail of the moving contact piece assembly 21 is welded to one end of the wire, and the other end of the wire is welded to the corresponding terminal in the base assembly 11, so that the external signal can flow from the terminal of the base assembly 11 to the moving contact piece assembly, and then the moving contact piece assembly 21 and the contact group 11e in the base assembly 11 form a circuit to play the role of connecting or disconnecting the external signal.

[0032] After the overall assembly, the arc isolation chamber 12 faces the coil 22 with its arc surface. The design of the arc surface enables the arc isolation chamber 12 to avoid interference with the coil 22 after assembly, and at the same time, it can block the arc that stretches inward and outward under the magnetic field force of the arc-blowing magnet 13 during the arcing process of the relay, preventing the arc from eroding the coil during the arcing process of the relay.

[0033] For the arc-blowing principle of the arc-blowing magnet, refer to Figure 12 . The arc-blowing magnet 13 will form a magnetic field from the N pole to the S pole around itself. When the relay contact group breaks the load and generates an arc, the current carried by the arc generates a Lorentz force away from the base assembly 11 under the action of the magnetic field of the arc-blowing magnet. Therefore, the arc will move in the direction away from the base under the action of the Lorentz force, and the arc length increases, so that the contact cooling area between the arc and the air increases, and thus the arc extinction speed is accelerated.

Claims

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

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

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

4. A multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: A groove is provided in the middle of the base assembly. A clamping groove that cooperates with the buckle of the arc isolation chamber is provided in the groove, and the end of the clamping groove is a chamfered structure. Guide grooves for slidably connecting to the arc isolation chamber are provided on both sides of the groove, and a base arc isolation grid corresponding to the arc isolation grid of the arc isolation chamber is provided.

5. A multi-contact magnetic blowout arc extinguishing structure according to claim 1, characterized in that: Two openings for passing through the contact group are provided between every two adjacent arc isolation grids of the base assembly.

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

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