Moving contact assembly of direct current contactor

Abstract

A moving contact assembly of a direct current contactor comprises a push rod and a moving contact, the upper end of the push rod is provided with an insulating base, the insulating base is provided with a contact hoop, the lower portions of the two side walls of the contact hoop are provided with arc protrusions protruding outwards, and a hollow installation cavity is internally provided with a contact positioning piece. A spring is installed between the lower surface of the contact positioning piece and the upper surface of the insulating base, an armature block is installed above the inner wall of the contact hoop, the moving contact is installed between the contact positioning piece and the armature block, contact blocks are arranged on the left side and the right side of the upper surface of the contact positioning piece, and the upper surfaces of the contact blocks make contact with the lower surface of the armature block. The contact positioning piece and the armature block are both metal pieces. According to the utility model, the defects in the prior art are overcome, the contact hoop is arranged, and the arc bulge can be matched with the rib on the inner wall of the ceramic cover of the contact cavity, so that the limiting effect on the whole contact hoop is realized, and the problem that the contact hoop is inclined in the moving process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a moving contact assembly of a DC contactor. Background Art

[0002] The DC contactor is generally composed of an iron core, a coil, an armature, a contact spring, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The armature will overcome the pulling force of the return spring under the action of the electromagnetic force and be attracted to the iron core, thereby driving the moving contact of the armature to close with the static contact (normally open contact). When the coil is powered off, the electromagnetic attraction also disappears, and the armature will return to its original position under the reaction force of the spring, so that the moving contact and the original static contact (normally closed contact) are attracted. In this way, the attraction and release achieve the purpose of conduction and disconnection in the circuit.

[0003] In order to prevent the moving contact assembly from moving in the width direction, the existing technology of the current DC contactor is to provide ribs at the corresponding positions of the inner wall of the contact cavity cover (ceramic cover), and to use the cooperation between the ribs and the surface of the moving contact in the width direction to prevent the moving contact assembly from moving in the width direction. However, since the convex parts of the moving contact assembly are respectively provided on the wings extending outward on both sides, and the upper ends of the wings in the existing technology are free ends, which are equivalent to cantilever structures and are easy to deform, and when the push rod component is deflected to a certain extent, the wings will be squeezed, and the wings are cantilever structures, and the elastic deformation is large, thereby affecting the contact effect of the contacts. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a moving contact assembly of a DC contactor, which overcomes the deficiencies of the prior art. A contact clamp is provided, and a circular arc protrusion can cooperate with the ribs on the inner wall of the ceramic cover of the contact cavity to achieve a limiting effect on the entire contact clamp, thereby avoiding the problem of the contact clamp being skewed during movement.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A moving contact assembly of a DC contactor comprises a push rod and a moving contact, the lower end of the push rod is connected to the moving iron core of the DC contactor, the upper end of the push rod is fixedly mounted with an insulating base, a contact clamp is fixedly mounted on the insulating base, a hollow mounting cavity with front and rear openings is formed between the insulating base and the contact clamp, arc protrusions protruding outward are arranged below the two side walls of the contact clamp, a contact locator is installed in the hollow mounting cavity, a spring is installed between the lower surface of the contact locator and the upper surface of the insulating base, an armature block is installed above the inner wall of the contact clamp, the moving contact is installed between the contact locator and the armature block, contact blocks are arranged on both left and right sides of the upper surface of the contact locator, the upper surface of the contact block is in contact with the lower surface of the armature block, and the contact locator and the armature block are both metal parts.

[0007] Preferably, an auxiliary contact mounting seat is fixedly installed on the upper surface of the contact clamp, auxiliary contact grooves are provided on the left and right sides of the upper surface of the auxiliary contact mounting seat, a spring is installed on the upper surface of the auxiliary contact mounting seat, both ends of the spring are respectively located in the auxiliary contact grooves, and auxiliary contacts are fixedly installed on both ends of the upper surface of the spring.

[0008] Preferably, positioning buckles are provided below both front and rear side surfaces of the auxiliary contact mounting seat, and clamping protrusions are provided on both front and rear sides of the upper surface of the contact clamp, and the positioning buckles are engaged with the clamping protrusions.

[0009] Preferably, positioning protrusions are provided at both left and right ends of the front and rear sides of the contact positioning member, the positioning protrusions are respectively in contact with the front and rear sides of the contact clamp, and the left and right length of the contact positioning member is smaller than the shortest distance between the two arc protrusions.

[0010] Preferably, a positioning hole is provided in the middle of the upper surface of the contact positioning piece, and a positioning block is provided in the middle of the lower surface of the moving contact, and the positioning block matches the positioning hole.

[0011] Preferably, a square hole is provided in the middle of the arc protrusion.

[0012] The utility model provides a moving contact assembly of a DC contactor. It has the following beneficial effects: by providing a contact clamp, and providing an outwardly protruding arc protrusion structure below the two side walls of the contact clamp, the arc protrusion can cooperate with the ribs on the inner wall of the ceramic cover of the contact cavity, thereby achieving a limiting effect on the entire contact clamp, and then effectively avoiding the problem of the contact clamp being skewed during movement. Secondly, during operation, when the short-circuit current flows through the moving contact, the magnetic lines of force around the moving contact gather at the contact locating piece, and the upper surface of the contact locating piece generates a magnetic field, which generates suction on the armature block, thereby preventing the moving contact from being bounced open. Thereby, the short-circuit resistance and impact resistance can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for describing the prior art are briefly introduced below.

[0014] Figure 1 A schematic diagram of the structure of the utility model;

[0015] Figure 2 A schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 A schematic diagram of the structure of the contact clamp in the utility model;

[0017] Figure 4 A schematic diagram of the structure of the contact positioning member in the utility model;

[0018] Description of the numbers in the figure:

[0019] 1. Push rod; 2. Moving contact; 3. Insulating base; 4. Contact clamp; 5. Arc protrusion; 6. Contact positioning piece; 7. Armature block; 8. Contact block; 9. Spring; 10. Auxiliary contact mounting seat; 11. Spring leaf; 12. Auxiliary contact; 13. Positioning buckle; 14. Clamping protrusion; 15. Positioning convex block; 16. Moving iron core; 17. Positioning hole; 18. Positioning block; 19. Square hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0021] Embodiment 1, as Figure 1-4 As shown, a moving contact assembly of a DC contactor includes a push rod 1 and a moving contact 2, the lower end of the push rod 1 is connected to the moving iron core 16 of the DC contactor, an insulating base 3 is fixedly installed on the upper end of the push rod 1, a contact clamp 4 is fixedly installed on the insulating base 3, a hollow installation cavity with front and rear openings is surrounded by the insulating base 3 and the contact clamp 4, arc protrusions 5 protruding outward are arranged below the two side walls of the contact clamp 4, a contact positioning piece 6 is installed in the hollow installation cavity, a spring 9 is installed between the lower surface of the contact positioning piece 6 and the upper surface of the insulating base 3, an armature block 7 is installed above the inner wall of the contact clamp 4, the moving contact 2 is installed between the contact positioning piece 6 and the armature block 7, contact blocks 8 are arranged on both sides of the upper surface of the contact positioning piece 6, the upper surface of the contact block 8 is in contact with the lower surface of the armature block 7, and the contact positioning piece 6 and the armature block 7 are both metal parts.

[0022] Working principle:

[0023] During use, when the coil assembly of the DC contactor is powered on, the moving iron core 16 will move axially along the push rod 1 due to the action of electromagnetic force, and then drive the insulating base 3 to move axially through the push rod 1, so that the moving contact 2 in the inner cavity of the contact clamp 4 contacts or separates from the static contact.

[0024] In this embodiment, by providing a contact clamp 4, and providing an outwardly protruding arc protrusion 5 structure below the two side walls of the contact clamp 4, the arc protrusion 5 can cooperate with the ribs of the inner wall of the ceramic cover of the contact cavity, so as to achieve a limiting effect on the entire contact clamp 4, and then effectively avoid the problem of the contact clamp 4 being skewed during movement. In addition, when assembling, the contact positioning member 6 can be first inserted into the hollow installation cavity from the position of the arc protrusion 5, and then the spring 9 can be installed between the insulating base 3 and the contact positioning member 6, and then the contact positioning member 6 is pressed down, so that there is a space between the contact positioning member 6 and the armature block 7, so that the moving contact 2 can be inserted between the contact positioning member 6 and the armature block 7 for installation and fixation.

[0025] Secondly, during operation, when the short-circuit current flows through the moving contact 2, the magnetic lines of force around the moving contact 2 gather at the contact positioning member 6, and the upper surface of the contact positioning member 6 generates a magnetic field, which generates a suction force on the armature block 7, thereby preventing the moving contact from being bounced. In this embodiment, the contact positioning member 6 and the armature block 7 may be provided with an upper strip-shaped pole shoe and a lower strip-shaped pole shoe that cooperate with each other, respectively, so as to increase the mutual suction force between the contact positioning member 6 and the armature block 7, thereby improving the short-circuit resistance and impact resistance.

[0026] Embodiment 2, as a further preferred solution of embodiment 1, an auxiliary contact mounting seat 10 is fixedly mounted on the upper surface of the contact clamp 4, auxiliary contact grooves are arranged on both sides of the upper surface of the auxiliary contact mounting seat 10, a spring 11 is mounted on the upper surface of the auxiliary contact mounting seat 10, both ends of the spring 11 are respectively located in the auxiliary contact grooves, and auxiliary contacts 12 are fixedly mounted on both ends of the upper surface of the spring 11. Therefore, when the insulating base 3 is driven to move axially by the push rod 1, the auxiliary contact mounting seat 10 will be pushed upward synchronously, so that the auxiliary contacts 12 at both ends of the spring 11 can cooperate with the auxiliary contacts to realize the monitoring of the action state of the main contact, thereby greatly improving the reliability of the DC contactor.

[0027] Embodiment 3, as a further preferred solution of embodiment 2, positioning buckles 13 are provided below both front and rear side surfaces of the auxiliary contact mounting seat 10, and clamping protrusions 14 are provided on both front and rear sides of the upper surface of the contact clamp 4, and the positioning buckles 13 are engaged with the clamping protrusions 14. Therefore, when installing the auxiliary contact mounting seat 10, the auxiliary contact mounting seat 10 can be quickly installed and fixed directly through the cooperation of the positioning buckles 13 and the clamping protrusions 14.

[0028] Embodiment 4, as a further preferred solution of embodiment 1, positioning protrusions 15 are provided at both left and right ends of the front and rear sides of the contact positioning member 6, and the positioning protrusions 15 are in contact with the front and rear sides of the contact clamp 4 respectively, and the left and right length of the contact positioning member 6 is less than the shortest distance between the two arc protrusions 5. Therefore, when installing the contact positioning member 6, the positioning protrusions 15 can be inserted into a suitable position along the position of the arc protrusions 5, so that the positioning protrusions 15 are respectively located on the front and rear sides of the contact clamp 4 for limiting, thereby effectively avoiding the problem of the contact positioning member 6 being skewed during movement.

[0029] Embodiment 5, as a further preferred solution of embodiment 1, a positioning hole 17 is provided in the middle of the upper surface of the contact positioning member 6, and a positioning block 18 is provided in the middle of the lower surface of the moving contact 2, and the positioning block 18 matches the positioning hole 17. By matching the positioning block 18 with the positioning hole 17, the contact positioning member 6 and the moving contact 2 can achieve a limited installation and fixing effect.

[0030] Embodiment 6, as a further preferred solution of embodiment 1, a square hole 19 is provided in the middle of the arc protrusion 5, thereby effectively reducing the material usage and weight of the contact clamp 4.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A moving contact assembly of a DC contactor, characterized in that: The invention comprises a push rod (1) and a moving contact (2), wherein the lower end of the push rod (1) is connected to a moving iron core (16) of a DC contactor, the upper end of the push rod (1) is fixedly mounted with an insulating base (3), a contact clamp (4) is fixedly mounted on the insulating base (3), a hollow mounting cavity with front and rear openings is formed between the insulating base (3) and the contact clamp (4), arc protrusions (5) protruding outward are arranged below the two side walls of the contact clamp (4), and a contact fixed contact (5) is mounted in the hollow mounting cavity. A contact locating member (6) is provided, a spring (9) is installed between the lower surface of the contact locating member (6) and the upper surface of the insulating base (3), an armature block (7) is installed above the inner wall of the contact clamp (4), the moving contact (2) is installed between the contact locating member (6) and the armature block (7), contact blocks (8) are arranged on both the left and right sides of the upper surface of the contact locating member (6), the upper surface of the contact block (8) is in contact with the lower surface of the armature block (7), and the contact locating member (6) and the armature block (7) are both metal parts.

2. The moving contact assembly of a DC contactor according to claim 1, characterized in that: An auxiliary contact mounting seat (10) is fixedly mounted on the upper surface of the contact clamp (4), auxiliary contact grooves are arranged on both left and right sides of the upper surface of the auxiliary contact mounting seat (10), a spring sheet (11) is mounted on the upper surface of the auxiliary contact mounting seat (10), two ends of the spring sheet (11) are respectively located in the auxiliary contact grooves, and auxiliary contacts (12) are fixedly mounted on both ends of the upper surface of the spring sheet (11).

3. The moving contact assembly of a DC contactor according to claim 2, characterized in that: Positioning buckles (13) are provided below the front and rear side surfaces of the auxiliary contact mounting seat (10), and clamping protrusions (14) are provided on the front and rear sides of the upper surface of the contact clamp (4), and the positioning buckles (13) are matched and clamped with the clamping protrusions (14).

4. The moving contact assembly of a DC contactor according to claim 1, characterized in that: The left and right ends of the front and rear side surfaces of the contact positioning member (6) are provided with positioning protrusions (15), the positioning protrusions (15) are respectively in contact with the front and rear side surfaces of the contact clamp (4), and the left and right length of the contact positioning member (6) is less than the shortest distance between the two arc protrusions (5).

5. The moving contact assembly of a DC contactor according to claim 1, characterized in that: A positioning hole (17) is provided in the middle of the upper surface of the contact positioning piece (6), and a positioning block (18) is provided in the middle of the lower surface of the moving contact (2), wherein the positioning block (18) matches the positioning hole (17).

6. The moving contact assembly of a DC contactor according to claim 1, characterized in that: A square hole (19) is provided in the middle of the arc protrusion (5).

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