Arc extinguish chamber structure of direct current contactor and contactor

Abstract

The arc extinguish chamber structure comprises an outer cover, an adapter ring, a baffle and a static contact, one end of the outer cover is connected with the adapter ring, the baffle is arranged in the outer cover, and the static contact penetrates through one side of the outer cover to be connected. Epoxy resin is poured into the cavity of the outer cover to fix the baffle, and a carried contact material splashed after a direct-current arc is magnetically blown to move and elongated is blocked through the step structure of the groove stroke on the baffle, so that the material is prevented from entering the groove and reaching a metallization layer part on the lower end face of the outer cover, and the contact material is prevented from being damaged. Therefore, the situation that a low-insulation loop is formed between the two static contacts through the metallization layer on the lower end face of the inner wall of the outer cover, and consequently a direct current contactor product fails is avoided, and the durability of the contactor is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of contactors, and in particular relates to an arc extinguishing chamber structure of a DC contactor and a contactor. Background Art

[0002] In a DC contactor, the interrupted DC current does not naturally cross the zero point. To facilitate arc extinguishing, the contact part needs to be sealed in the arc extinguishing chamber cavity, and arc extinguishing methods such as magnetic blowing are used to move and lengthen the arc so that the arc is extinguished. In the process of interrupting the DC current, the contact ablation material is moved and elongated by the magnetic blowing, and the arc splashes onto the inner surface of the arc extinguishing chamber. As a result, after a certain number of interruptions of the DC current, the insulation performance of the inner surface of the arc extinguishing chamber is reduced after being splashed by the arc, which leads to a reduction in the insulation between the contacts, affecting the electrical life of the DC contactor. Therefore, a contactor is needed that can avoid the generation of a low insulation circuit between the two static contacts.

[0003] The patent document with the announcement number CN113963991A discloses a ceramic and epoxy double sealed high voltage DC contactor, including an outer iron core, on which a sealing component, a moving component, a moving contact and a static contact are arranged, the moving component is used to drive the moving contact to move, the sealing component includes a ceramic inner support cover and an epoxy resin poured on the ceramic inner support cover, the ceramic inner support cover is welded with a contact valve ring and a large valve ring by ceramic brazing technology, and the static contact is welded in the contact valve ring. However, the invention does not prevent the arc from splashing onto the inner cavity surface of the arc extinguishing chamber, thereby affecting the service life of the contactor. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an arc extinguishing chamber structure of a DC contactor and a contactor.

[0005] The present invention is achieved through the following technical solutions.

[0006] The invention provides an arc extinguishing chamber structure of a DC contactor, comprising an outer cover, an adapter ring, a baffle and a static contact, wherein one end of the outer cover is connected to the adapter ring, the baffle is arranged in the outer cover, and the static contact penetrates one side of the outer cover for connection.

[0007] Preferably, cavity A, cavity B and cavity C are arranged on the outer cover, cavity B is arranged between cavity A and cavity C, and ribs are arranged on the inner walls on both sides of cavity B.

[0008] Preferably, the upper end surface and the lower end surface of the outer cover are both provided with a metallization layer, and a through hole A is provided on the upper end surface, and the static contact passes through the through hole A through the upper end surface for connection.

[0009] Preferably, the adapter ring is ring-shaped, a connecting ring is arranged on one side of the adapter ring close to the outer cover, and the adapter ring is connected to the outer cover via the connecting ring.

[0010] Preferably, the baffle is U-shaped, a connecting rod is arranged on the baffle, a slot is arranged at one end of the connecting rod, a groove is arranged at the other end of the baffle, and the baffle is connected to the outer cover through the connecting rod.

[0011] Preferably, the groove is arranged in an L shape, and the opening direction of the groove is the same as the opening direction of the slot.

[0012] Preferably, the baffle material includes ceramic or polyimide.

[0013] Preferably, a thin-wall structure is provided on the static contact, and the thin-wall structure is connected to the outer cover.

[0014] A DC contactor comprises an arc extinguishing chamber structure, a moving contact, a transmission component, a magnetic conductor and a sleeve, wherein the moving contact is connected to one end of the transmission component, the transmission component is connected to an armature after passing through an iron core, one side of the magnetic conductor is connected to an outer cover of the arc extinguishing chamber structure, the iron core passes through the magnetic conductor and is connected, the sleeve is connected to the other side of the magnetic conductor, and the iron core and the armature are arranged in the sleeve.

[0015] Preferably, an exhaust pipe is provided on the magnetic conductor, and the exhaust pipe passes through the magnetic conductor for connection; an elastic part A and an elastic part B are provided on the transmission component, and the transmission component passes through the elastic part A and the elastic part B respectively; one end of the elastic part A is connected to the moving contact, and the other end of the elastic part A is connected to the iron core; one end of the elastic part B is connected to the iron core, and the other end of the elastic part B is connected to the armature.

[0016] The beneficial effects of the present invention are:

[0017] The present invention fills epoxy resin into the cavity of the outer cover to fix the baffle, and blocks the contact material carried by the DC arc that is moved by magnetic blowing, stretched and splashed through the step structure of the groove stroke on the baffle, so as to prevent the material from entering the groove and reaching the metallized layer part of the lower end surface of the outer cover, thereby preventing a low insulation loop from being formed between two static contacts through the metallized layer of the lower end surface of the inner wall of the outer cover, which causes the failure of the DC contactor product and improves the durability of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of the outer cover of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the outer cover of the present invention;

[0021] Figure 4 It is a schematic diagram of the structure of the outer cover of the present invention;

[0022] Figure 5 It is a structural schematic diagram of the adapter ring of the present invention;

[0023] Figure 6 It is a structural schematic diagram of the baffle of the present invention;

[0024] Figure 7 It is a structural schematic diagram of the static contact of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the non-arc-extinguishing chamber structural part of the DC contactor of the present invention;

[0026] Fig. 9 is a schematic structural diagram of a DC contactor of Embodiment 2;

[0027] In the figure: 1-outer cover, 101-cavity A, 102-cavity B, 103-cavity C, 104-rib, 105-lower end surface, 106-upper end surface, 107-through hole A, 2-adapter ring, 21-connecting ring, 3-baffle, 31-groove, 32-slot, 33-connecting rod, 4-static contact, 41-thin-wall structure, 5-moving contact, 6-transmission component, 61-elastic part A, 62-elastic part B, 7-magnetic conductor, 8-exhaust pipe, 9-sleeve, 10-core, 11-armature. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0029] Embodiment 1:

[0030] like Figures 1 to 8 As shown, an arc extinguishing chamber structure of a DC contactor includes an outer cover 1, an adapter ring 2, a baffle 3 and a static contact 4. One end of the outer cover 1 is fixedly connected to the adapter ring 2 by brazing, the baffle 3 is arranged in the outer cover 1, and the static contact 4 passes through one side of the outer cover 1 for connection.

[0031] The outer cover 1 is a ceramic cover, and a cavity A101, a cavity B102 and a cavity C103 are arranged on the outer cover 1. The cavity B102 is arranged between the cavity A101 and the cavity C103. Four ribs 104 are arranged on the inner walls on both sides of the cavity B102 for preventing the moving contact 5 from rotating.

[0032] The upper end surface 106 and the lower end surface 105 of the outer cover 1 are both provided with a metallization layer, and a through hole A107 is provided on the upper end surface 106 , and the static contact 4 passes through the upper end surface 106 and is connected via the through hole A107 .

[0033] The adapter ring 2 is annular, and a connecting ring 21 is provided on the side of the adapter ring 2 close to the outer cover 1, and the adapter ring 2 is connected to the outer cover 1 through the connecting ring 21. The connecting ring 21 mainly serves as a connection between the outer cover 1 and the magnetic conductor 7. The connecting ring 21 is a thin-walled structure, which can make the adapter ring 2 have a large elastic deformation and reduce the stress after welding with the outer cover 1.

[0034] The baffle 3 is U-shaped, and a connecting rod 33 is provided on the baffle 3. A slot 32 is provided at one end of the connecting rod 33, and a groove 31 is provided at the other end of the baffle 3. After the baffle 3 is extended into the cavity A101 and the cavity C103 through the connecting rod 33, epoxy resin is poured into the cavity A101 and the cavity C103 to connect and fasten the baffle 3 to the outer cover 1. The slot 32 can form a buckle-like structure with the epoxy resin, effectively preventing the insulating baffle 3 from falling out of the outer cover 1.

[0035] The groove 31 is L-shaped and has a step structure, and the opening direction of the groove 31 is the same as the opening direction of the slot 32. The groove 31 is inverted in the DC contactor, and the opening of the groove 31 faces the guide magnet 7 and the inner wall of the outer cover 1.

[0036] The baffle 3 is made of ceramic or polyimide and has good high temperature resistance and insulation properties.

[0037] The static contact 4 is provided with a thin-walled structure 41, and the thin-walled structure 41 is connected to the outer cover 1. The static contact 4 is a cylindrical structure, and is fixed to the outer cover 1 by brazing. The surface brazed with the outer cover 1 is provided with a thin-walled structure 41, and the thin-walled structure 41 can reduce the stress after welding with the outer cover 1. The static contact 1 and the moving contact 5 form a bridge-type double-break contact pair. When interrupting the direct current, under the action of magnetic blowing, the arc is elongated and deformed from the inside to the outside along the radial direction of the static contact 1.

[0038] The DC contactor includes an arc extinguishing chamber structure, a moving contact 5, a transmission component 6, a magnetizer 7 and a sleeve 9. The moving contact 5 is connected to one end of the transmission component 6. The transmission component 6 passes through the iron core 10 and is connected to the armature 11. One side of the magnetizer 7 is connected to the outer cover 1 of the arc extinguishing chamber structure. The iron core 10 passes through the magnetizer 7 and is connected. The sleeve 9 is connected to the other side of the magnetizer 7. The iron core 10 and the armature 11 are arranged in the sleeve 9.

[0039] An exhaust pipe 8 is arranged on the magnetizer 7, and the exhaust pipe 8 penetrates the magnetizer 7 for connection. An elastic member A61 and an elastic member B62 are arranged on the transmission component 6, and the transmission component 6 penetrates the elastic member A61 and the elastic member B62 respectively. One end of the elastic member A61 is connected to the moving contact 5, and the other end of the elastic member A61 is connected to the iron core 10. The elastic member A61 can be connected to the iron core 10 through a dust cover. One end of the elastic member B62 is connected to the iron core 10, and the other end of the elastic member B62 is connected to the armature 11.

[0040] The moving contact 5 and the static contact 4 form a contact pair, and conduct current when the DC contactor is closed. The transmission component 6 controls the moving contact 5 and the static contact 4 to close and disconnect when the DC contactor is powered on and off. The magnetic conductor 7 is laser welded to the sleeve 9, the magnetic conductor 7 is brazed to the exhaust pipe 8, and the magnetic conductor 7 is laser welded to the adapter ring 2, and the arc extinguishing chamber cavity is formed after the outer cover 1 is added. The exhaust pipe 8 is used to extract the air inside the arc extinguishing chamber cavity.

[0041] Embodiment 2:

[0042] The arc extinguishing chamber structure of a DC contactor and the DC contactor are basically the same as those of Example 1, except that the baffle 3 is not provided.

[0043] like Figure 1 As shown, the arc extinguishing chamber insulation structure of the present invention can make the loop formed by the arc moving and stretching between the moving contact 5 and the static contact 4 unable to cross over the insulating baffle 3 to reach the groove 31 formed by the insulating baffle 3 and the inner wall of the outer cover 1, so that there is a groove 31 with high insulation between the two static contacts 4, so that after breaking the DC current a certain number of times, the insulation performance between the two static contacts 4 still meets the requirements, and the DC current can be broken more times, thereby improving the electrical life of the DC contactor.

[0044] like Fig. 9 As shown, when the contact pair of the DC contactor interrupts the DC current, a DC arc is generated between the moving contact 5 and the static contact 4. The arc moves, stretches and deforms under the action of the Lorentz force under the action of magnetic blowing. The DC arc is stretched to the inner wall of the outer cover 1, connecting the moving contact 5 and the static contact 4. After the arc is stretched to the inner wall of the outer cover 1, the materials of the moving contact 5 and the static contact 4 in the arc are splashed onto the inner wall of the outer cover 1, and the insulation performance of the inner wall of the magnetic outer cover 1 is reduced. Since a metallized layer is designed on the lower end surface 105 of the outer cover 1, a low insulation circuit is formed between the two static contacts 4 through the metallized layer on the lower end surface 105 of the outer cover 1, resulting in failure of the DC contactor product.

Claims

1. An arc extinguishing chamber structure of a DC contactor, characterized in that: The invention comprises an outer cover (1), an adapter ring (2), a baffle (3) and a static contact (4); one end of the outer cover (1) is connected to the adapter ring (2); the baffle (3) is arranged inside the outer cover (1); and the static contact (4) penetrates one side of the outer cover (1) for connection.

2. The arc extinguishing chamber structure of a DC contactor according to claim 1, characterized in that: The outer cover (1) is provided with a cavity A (101), a cavity B (102) and a cavity C (103); the cavity B (102) is provided between the cavity A (101) and the cavity C (103); and ribs (104) are provided on the inner walls of both sides of the cavity B (102).

3. The arc extinguishing chamber structure of a DC contactor according to claim 1, characterized in that: The upper end surface (106) and the lower end surface (105) of the outer cover (1) are both provided with a metallized layer, a through hole A (107) is provided on the upper end surface (106), and the static contact (4) penetrates the upper end surface (106) and is connected via the through hole A (107).

4. The arc extinguishing chamber structure of a DC contactor according to claim 1, characterized in that: The adapter ring (2) is ring-shaped, and a connecting ring (21) is arranged on one side of the adapter ring (2) close to the outer cover (1). The adapter ring (2) is connected to the outer cover (1) via the connecting ring (21).

5. The arc extinguishing chamber structure of a DC contactor according to claim 1, characterized in that: The baffle (3) is U-shaped, a connecting rod (33) is arranged on the baffle (3), a slot (32) is arranged at one end of the connecting rod (33), a groove (31) is arranged at the other end of the baffle (3), and the baffle (3) is connected to the outer cover (1) via the connecting rod (33).

6. The arc extinguishing chamber structure of a DC contactor according to claim 5, characterized in that: The groove (31) is arranged in an L shape, and the opening direction of the groove (31) is the same as the opening direction of the slot (32).

7. The arc extinguishing chamber structure of a DC contactor according to claim 5, characterized in that: The baffle (3) is made of materials including ceramic and polyimide.

8. The arc extinguishing chamber structure of a DC contactor according to claim 1, characterized in that: A thin-walled structure (41) is provided on the static contact (4), and the thin-walled structure (41) is connected to the outer cover (1).

9. A DC contactor according to any one of claims 1 to 8, characterized in that: The invention comprises an arc extinguishing chamber structure, a moving contact (5), a transmission component (6), a magnetizer (7) and a sleeve (9), wherein the moving contact (5) is connected to one end of the transmission component (6), the transmission component (6) passes through an iron core (10) and is connected to an armature (11), one side of the magnetizer (7) is connected to an outer cover (1) of the arc extinguishing chamber structure, the iron core (10) passes through the magnetizer (7) and is connected, the sleeve (9) is connected to the other side of the magnetizer (7), and the iron core (10) and the armature (11) are arranged in the sleeve (9).

10. A DC contactor according to claim 9, characterized in that: An exhaust pipe (8) is provided on the magnetic conductor (7), and the exhaust pipe (8) penetrates the magnetic conductor (7) and is connected; an elastic member A (61) and an elastic member B (62) are provided on the transmission component (6), and the transmission component (6) penetrates the elastic member A (61) and the elastic member B (62) respectively; one end of the elastic member A (61) is connected to the moving contact (5), and the other end of the elastic member A (61) is connected to the iron core (10); one end of the elastic member B (62) is connected to the iron core (10), and the other end of the elastic member B (62) is connected to the armature (11).

Images