Auxiliary contact structure of small and medium-sized ceramic high-voltage direct-current contactor

Abstract

The utility model is suitable for the technical field of contactors, and provides an auxiliary contact structure of a small and medium-sized ceramic high-voltage direct-current contactor, which comprises a bottom plate, a mounting hole is formed in the center of the bottom plate, an arc extinguishing cover is arranged on one side of the bottom plate, and an auxiliary contact assembly is arranged on one side, far away from the bottom plate, of the arc extinguishing cover. The auxiliary contact assembly comprises a plurality of groups of contacts, a circuit board, a microswitch and a fixing frame, a moving assembly is arranged in the arc extinguishing cover, and the moving assembly comprises an ejector pin base, an ejector pin contact and an elastic assembly. According to the device, the problems of resistance increase and signal stability reduction caused by friction are solved, and the effects of prolonging the service life, improving the connection or disconnection reliability of the auxiliary contact of the contactor, improving the operation stability and saving the cost are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to contactor technical field more specifically, it relates to a kind of auxiliary contact structure of small and medium-sized ceramic high-voltage direct current contactor. BACKGROUND

[0002] Contactor can quickly cut off and connect AC and DC main circuit, realize the start-stop control of motor, electric heater, lighting equipment and other electric power load, is indispensable in electrical automation application A kind of electrical element, contactor includes coil, static core, moving core, main contact, auxiliary contact and the like.

[0003] At present, contactor is usually using elastic spring piece as the element of connecting or disconnecting auxiliary contact, this elastic spring piece needs to ensure its conductivity, so need to be gold-plated or silver-plated on its surface, in actual use process, spring piece needs to be frequently contacted and rubbed with corresponding contact, after long time use, gold-plated, silver on the surface of spring piece gradually wears and loses, leading to the resistance between contact surface increases, signal transmission stability drops.

[0004] Therefore, an auxiliary contact structure of small and medium-sized ceramic high-voltage direct current contactor is proposed to solve the problem of increased resistance and decreased signal stability caused by friction. UTILITY MODEL CONTENT

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an auxiliary contact structure of small and medium-sized ceramic high-voltage direct current contactor that improves the service life, the reliability of the contactor auxiliary contact connection or disconnection, and the operation stability.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] An auxiliary contact structure of small and medium-sized ceramic high-voltage direct current contactor, comprising a bottom plate, the bottom plate is provided with a mounting hole in the center, the bottom plate is provided with an arc extinguishing cover on one side, the arc extinguishing cover is provided with an auxiliary contact assembly away from the bottom plate on the side, the auxiliary contact assembly comprises a plurality of contact heads, a circuit board, a micro switch and a fixing frame, the arc extinguishing cover is provided with a moving assembly inside, the moving assembly comprises a thimble base, a thimble contact and an elastic assembly.

[0008] By adopting the above technical scheme, the thimble base, the thimble contact and the elastic assembly are used to connect or disconnect the auxiliary contact assembly, compared with the original spring piece, the internal elastic assembly can avoid the thimble base from transmitting excessive force to damage the auxiliary contact assembly, thereby improving the service life of the auxiliary contact assembly.

[0009] The utility model further sets up: the motion subassembly still includes magnetic slide, reset spring and push rod, the push rod is inserted in the mounting hole of bottom plate, and its with bottom plate sliding connection, the magnetic slide is installed in push rod far from bottom plate one end, and the magnetic slide is fixedly connected with the push rod.

[0010] The utility model further sets up: reset spring is installed between magnetic slide and bottom plate, the thimble base is installed in push rod far from magnetic slide one end.

[0011] The utility model further sets up: the thimble base far from push rod one side is provided with flange, the thimble contact is inserted in the thimble base inside, the thimble contact is provided with ring platform near push rod one side, be provided with elastic assembly between thimble base and thimble contact, magnetic slide, reset spring, push rod, thimble base, thimble contact and elastic assembly coaxial arrangement.

[0012] The utility model further sets up: multiple contact head is inserted in arc extinguishing cover far from bottom plate one side, the circuit board is connected between multiple contact head, the fixed frame is fixedly connected with circuit board, microswitch is fixedly connected with circuit board.

[0013] The utility model further sets up: circuit board, microswitch and fixed frame all set up in arc extinguishing cover inside, the fixed frame is set up in the arc extinguishing cover inner wall adhesion, microswitch is provided with switch contact near thimble contact one side.

[0014] Through adopting above-mentioned technical scheme, thimble contact and switch contact contact, realize multiple contact head's on or off, compared with the on or off of original spring piece, avoid the mutual friction between spring piece, make on or off more reliable, and the stability of operation is higher.

[0015] Summarized above, the present application includes following at least one beneficial technical effect:

[0016] 1, through thimble base, thimble contact and elastic assembly cooperation realize the on or off of auxiliary contactor assembly, compared with the on or off of original spring piece, the elastic assembly in the interior can avoid the damage of auxiliary contactor assembly by the excessive pushing force of thimble base transmission, improve the service life of auxiliary contactor assembly.

[0017] 2, through thimble contact and switch contact contact, realize multiple contact head's on or off, compared with the on or off of original spring piece, avoid the mutual friction between spring piece, make on or off more reliable, and the stability of operation is higher. DRAWINGS

[0018] Figure 1 It is the structure diagram of auxiliary contactor structure of small and medium-sized ceramic high-voltage direct current contactor in the utility model.

[0019] Figure 2 For Figure 1 Sectional view in A-A section direction.

[0020] Figure 3 For Figure 2 Local enlarged view of B area.

[0021] 1, bottom plate;

[0022] 2, arc extinguishing cover;

[0023] 3, auxiliary contact assembly; 31, contact head; 32, circuit board; 33, micro switch; 331, switch contact;

[0024] 4, movement assembly; 41, magnetic slider; 42, reset spring; 43, push rod; 44, thimble base; 45, thimble contact; 46, elastic assembly. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0027] Embodiment one, please refer to Figures 1-3 The present application provides the following technical solutions:

[0028] Specifically, it refers to an auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor, please refer to Figures 1-2 , comprising a bottom plate 1, the bottom plate 1 is installed with the base of the contactor, the arc extinguishing cover 2 is installed on the bottom plate 1 away from the base of the contactor, the arc extinguishing cover 2 isolates the internal arc, provides a safe power environment, the auxiliary contact assembly 3 is installed on the side of the arc extinguishing cover 2 away from the base of the contactor, the auxiliary contact assembly 3 is used for connecting with the external circuit, the auxiliary contact assembly 3 is used for detecting whether the contactor is attracted or not, the movement assembly 4 is arranged in the arc extinguishing cover 2, the movement assembly 4 receives the magnetic force of the base of the contactor, and controls the auxiliary contact assembly 3 to be connected or disconnected.

[0029] Please refer to Figures 2-3The auxiliary contact assembly 3 comprises a plurality of contact groups 31, a circuit board 32, a micro switch 33 and a fixing frame 34. The plurality of contact groups 31 are inserted on the side of the arc extinguishing cover 2 away from the base plate 1. The circuit board 32 is connected between the plurality of contact groups 31. The fixing frame 34 is fixedly connected with the circuit board 32. The micro switch 33 is fixedly connected with the circuit board 32. The circuit board 32, the micro switch 33 and the fixing frame 34 are all arranged inside the arc extinguishing cover 2. The fixing frame 34 is arranged in close contact with the inner wall of the arc extinguishing cover 2. The micro switch 33 is provided with a switch contact 331 on the side close to the needle contact 45. The micro switch 33 can adopt a standard part of D2LS-11 model or a similar finished micro switch, which has low procurement cost and is easy to replace after damage. The base plate 1 is provided with a mounting hole in the center. The moving assembly 4 comprises a magnetic slider 41, a return spring 42, a push rod 43, a needle base 44, a needle contact 45 and an elastic assembly 46. The magnetic slider 41, the return spring 42 and the push rod 43 are installed inside the base of the contactor. The magnetic slider 41 is fixedly connected with the push rod 43. The return spring 42 is installed between the magnetic slider 41 and the base plate 1. The needle base 44 is installed at the end of the push rod 43 away from the magnetic slider 41. The push rod 43 is inserted into the mounting hole of the base plate 1 and is in sliding connection with the base plate 1. The magnetic slider 41 is installed at the end of the push rod 43 away from the base plate 1 and is fixedly connected with the push rod 43. The needle base 44 is provided with a flange on the side away from the push rod 43. The needle contact 45 is inserted into the needle base 44. The needle contact 45 is provided with a ring table on the side close to the push rod 43. The needle base 44 and the needle contact 45 are provided with the elastic assembly 46 therebetween. The magnetic slider 41, the return spring 42, the push rod 43, the needle base 44, the needle contact 45 and the elastic assembly 46 are coaxially arranged.

[0030] The push rod 43 is further fixedly connected with a main contact piece and a spring buckle. A main contact piece spring is installed between the main contact piece and the spring buckle. When the contactor is attracted, the push rod 43 moves, driving the main contact piece and the spring buckle to move. The main contact piece and the plurality of main contacts are in close contact, realizing the connection of the main circuit. The push rod 43 continues to move in the original direction. The main contact piece spring is compressed, so that the main contact piece is in closer contact with the main contact, reducing the resistance between the contact surfaces.

[0031] In use, the base of the contactor is attracted, the electromagnetic coil inside the base of the contactor generates a magnetic field, the magnetic slider 41 and the push rod 43 are pushed away from the side of the base of the contactor, the reset spring 42 is pressed, the push rod 43 moves synchronously with the needle base 44, the needle contact 45 and the elastic assembly 46 away from the end of the base of the contactor, the needle contact 45 pushes the switch contact 331 to make the micro switch 33 closed, at this time the contact head 31, the circuit board 32 and the plurality of contact heads 31 form a path, but the magnetic slider 41 is still moving away from the base of the contactor at this time, and the moving force is much greater than the maximum thrust that the micro switch 33 can withstand, therefore, after the switch contact 331 is moved to the recessed plane of the micro switch 33, the needle contact 45 is in contact with the surface of the micro switch 33, the elastic assembly 46 is compressed until the magnetic slider 41 is moved into position. The cooperation of the needle base 44, the needle contact 45 and the elastic assembly 46 avoids the damage of the auxiliary contact assembly 3 caused by the excessive thrust of the magnetic slider 41, improves the service life of the auxiliary contact assembly 3, and the needle contact 45 and the switch contact 331 are in a moving relationship, avoiding the problem of increased resistance caused by the mutual friction between the needle contact 45 and the switch contact 331, making the contact of the contactor auxiliary contact more reliable and the stability of the operation higher.

[0032] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

Claims

1. A small and medium-sized ceramic high-voltage DC contactor auxiliary contact structure, comprising a base plate (1), a mounting hole is formed in the center of the base plate (1), and an arc extinguishing cover (2) is arranged on one side of the base plate (1), characterized in that: The arc extinguishing cover (2) is provided with an auxiliary contact assembly (3) away from the bottom plate (1), the auxiliary contact assembly (3) comprises a plurality of contact heads (31), a circuit board (32), a micro switch (33) and a fixing frame (34), the arc extinguishing cover (2) is provided with a movement assembly (4) inside, the movement assembly (4) comprises a thimble base (44), a thimble contact (45) and an elastic assembly (46).

2. The auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor according to claim 1, characterized in that: The movement assembly (4) further comprises a magnetic slider (41), a reset spring (42) and a push rod (43), the push rod (43) is inserted into the mounting hole of the bottom plate (1) and is in sliding connection with the bottom plate (1), the magnetic slider (41) is installed at the end of the push rod (43) away from the bottom plate (1), and the magnetic slider (41) is fixedly connected with the push rod (43).

3. The auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor according to claim 2, characterized in that: The reset spring (42) is installed between the magnetic slider (41) and the bottom plate (1), and the thimble base (44) is installed at the end of the push rod (43) away from the magnetic slider (41).

4. The auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor according to claim 2, characterized in that: The thimble base (44) is provided with a flange away from the push rod (43), the thimble contact (45) is inserted into the thimble base (44), the thimble contact (45) is provided with a ring table close to the push rod (43), the elastic assembly (46) is arranged between the thimble base (44) and the thimble contact (45), and the magnetic slider (41), the reset spring (42), the push rod (43), the thimble base (44), the thimble contact (45) and the elastic assembly (46) are coaxially arranged.

5. The auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor according to claim 1, characterized in that: A plurality of contact heads (31) are inserted into the arc extinguishing cover (2) away from the bottom plate (1), the circuit board (32) is connected between the plurality of contact heads (31), the fixing frame (34) is fixedly connected with the circuit board (32), and the micro switch (33) is fixedly connected with the circuit board (32).

6. The auxiliary contact structure of a small and medium-sized ceramic high-voltage DC contactor according to claim 5, characterized in that: The circuit board (32), the micro switch (33) and the fixing frame (34) are arranged inside the arc extinguishing cover (2), the fixing frame (34) is arranged in abutment with the inner wall of the arc extinguishing cover (2), and the micro switch (33) is provided with a switch contact (331) close to the thimble contact (45).

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