Electromagnetic system and contactor

Abstract

The utility model provides an electromagnetic system and a contactor, the electromagnetic system comprises a holding coil and / or a starting coil, a movable iron core and a static iron core, the movable iron core is connected with a contact pushing part, the opposite end faces of the movable iron core and the static iron core are in concave-convex structure cooperation, and the pushing stroke of the movable iron core is improved. The opposite end faces of the movable iron core and the static iron core are arranged to be in concave-convex structure matching, the pushing stroke of the movable iron core can be improved, compared with a traditional flat head contact mode, when the same gap between the movable iron core and the static iron core is adopted, the pushing stroke of the structure of the scheme is larger through the concave-convex matching mode, and therefore a larger opening distance can be set between the movable contact and the static contact. The voltage bearing capacity of the contactor or the relay is improved, and the contact load capacity is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to an electromagnetic system and a contactor. Background Art

[0002] In the field of high-voltage DC contactors or relays, the current electromagnetic system has a small pushing stroke due to the flat-head contact of the moving and static iron cores in the coil, which leads to a small opening distance of the contacts and low insulation capacity between the normally open and normally closed positions. In response to the above defects, this application is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide an electromagnetic system and a contactor, which can increase the driving stroke of the electromagnetic system and provide support for increasing the contact opening distance and improving the insulation capacity between disconnected contacts.

[0004] In order to solve the above problems, the utility model provides an electromagnetic system, including a coil assembly, the coil assembly includes a holding coil, a starting coil, or only one of the coils is set, the holding coil and the starting coil are installed on the wire rack, and the electromagnetic system also includes a static iron core and a reaction spring; the moving iron core is connected to the contact pushing part, and the relative end faces of the moving iron core and the static iron core are matched with a concave and convex structure to increase the pushing stroke of the moving iron core.

[0005] When the coil generates a magnetic field, the moving iron core moves toward the static iron core under the action of the magnetic field. The moving iron core pushes the moving contact through the contact pushing part, so that the moving contact and the static contact are closed and the circuit is conductive. In this process, the cooperation of the concave and convex structure makes the pushing stroke of the moving iron core larger, thereby enabling a larger opening distance to be set between the moving and static contacts.

[0006] Optionally, a convex shape is provided on the moving iron core, and a concave shape is provided on the static iron core, or the moving iron core is provided with a concave shape, and the static iron core is provided with a convex shape.

[0007] It is preferred that a convex shape is provided on the moving iron core and a concave shape is provided on the static iron core, so that the movement process is more stable.

[0008] According to an embodiment of the present invention, the shape of the pit is a bell-mouth structure, that is, the diameter of the opening is larger than the inner diameter.

[0009] According to an embodiment of the present invention, the width of the protrusion gradually decreases from the outer end to the inner side, which cooperates with the concave shape of the bell-mouth structure to achieve a more stable contact and movement effect.

[0010] Preferably, the longitudinal sections of the concave shape and the convex shape are both trapezoidal, with inclined surfaces on both sides that can play a guiding role and form the above-mentioned convex shape and concave shape.

[0011] Optionally, the cross-sections of the concave shape and the convex shape are both circular. In other embodiments, the cross-sections may be square or other shapes.

[0012] Optionally, the contact pushing portion is a push rod, and one end of the contact pushing portion is mounted in a mounting hole provided in the moving iron core, and the mounting method can be clamping, threaded connection, welding, etc.

[0013] According to an embodiment of the present invention, the electromagnetic system further includes a magnetic field enhancement module, which includes a magnetic conductive plate, a magnetic conductive tube and a yoke.

[0014] A contactor or relay comprising the above electromagnetic system.

[0015] The beneficial effect of the present invention is that by setting the relative end faces of the moving iron core and the static iron core to be matched with a concave-convex structure, the pushing stroke of the moving iron core can be increased. Compared with the traditional flat-head contact method, the concave-convex matching method has a larger pushing stroke when the same gap between the moving and static iron cores is used, thereby enabling a larger opening distance to be set between the moving and static contacts, thereby improving the voltage bearing capacity of the contactor or relay and increasing the contact load capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 Schematic diagram of the overall structure of the electromagnetic system;

[0018] Figure 2 This is a schematic diagram of the connection between the contact pusher and the moving contact module of the electromagnetic system. DETAILED DESCRIPTION

[0019] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0020] Example 1:

[0021] Electromagnetic system, which can be applied to contactors or relays.

[0022] like Figure 1 , including a bobbin 051, a holding coil 052, a starting coil 053, a moving iron core 057, a static iron core 058, a yoke 054, a magnetic plate 055, a magnetic tube 056, and a reaction spring 059.

[0023] The yoke 054, the magnetic plate 055 and the magnetic tube 056 are used to enhance the magnetic field.

[0024] The holding coil 052 and the starting coil 053 are mounted on the wire rack 051, and the moving iron core 057 is connected to the contact pusher 023. In this embodiment, the contact pusher 023 adopts a push rod, which passes through the through hole on the static iron core 058 and is connected to the moving contact module. Figure 2 The moving contact module includes a single-stage moving contact assembly 022 and a contact base 021 , and the contact pushing portion 023 is connected to the contact base 021 .

[0025] The relative end faces of the moving iron core 057 and the static iron core 058 are matched with a concave-convex structure, which improves the pushing stroke of the moving iron core 057. When the contact opening distance is the same, the concave-convex matching method is compared with the traditional flat head contact method, and the gap between the moving and static iron cores is smaller; when the same gap is used, this solution can support a larger contact opening distance.

[0026] Specifically, a protrusion shape 0571 is provided on the moving iron core 057 , the longitudinal section of the protrusion shape 0571 is trapezoidal, and the overall shape can be a truncated cone or a trapezoid, and the push rod is connected to the protrusion shape 0571 .

[0027] A concave shape 0581 is provided on the static iron core 058 , and the longitudinal section of the concave shape 0581 is also trapezoidal, forming a trumpet shape, and its overall shape preferably matches the shape of the convex shape 0571 .

[0028] By providing a convex shape 0571 on the moving iron core 057 and a concave shape 0581 on the static iron core 058, the moving iron core 057 is more stable during movement. Compared with the traditional flat-head contact method of the moving and static iron cores, the concave-convex matching method has a larger pushing stroke, thereby enabling a larger opening distance to be set between the moving and static contacts, thereby improving the voltage bearing capacity of the contactor or relay and increasing the contact load capacity.

[0029] Specifically, holes are provided on the contact surfaces of the moving iron core 057 and the static iron core 058 and reaction springs 059 are placed thereon.

[0030] The operating principle is: the starting coil 053 and the holding coil 052 are energized at the same time or the starting coil 053 is energized before the holding coil 052, and the coils generate a magnetic field; the moving iron core 057 is moved toward the static iron core 058 under the action of the magnetic field, and the moving iron core 057 pushes the moving contact, the moving contact and the static contact to close through the push rod. It is preferably set to a section of overtravel to ensure the contact effect (the overtravel is the section of travel in which the single-stage moving contact assembly is pushed to continue moving after the moving and static contacts contact to produce a certain deformation), the circuit is connected, and then the starting coil 053 is de-energized, and the holding coil 052 keeps the contact conductive with low power consumption; when the holding coil 052 is also de-energized, the moving iron core 057 moves away from the static iron core 058 under the action of the contact spring and the reaction spring 059, and the moving iron core 057 drives the push rod to move, the moving contact is separated from the static contact, and the circuit is disconnected.

[0031] Example 2:

[0032] Different from the embodiment 1, in this embodiment, the moving iron core 057 is provided with a concave shape, and the static iron core 058 is provided with a convex shape.

[0033] A contactor or a relay, comprising the electromagnetic system in any one of the above embodiments.

[0034] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. Electromagnetic system, characterized in that: The invention comprises a holding coil (052) and / or a starting coil (053), a moving iron core (057), a static iron core (058) and a reaction spring (059); the moving iron core (057) is connected to the contact pushing portion (023); the relative end surfaces of the moving iron core (057) and the static iron core (058) are matched with concave and convex structures, thereby improving the pushing stroke of the moving iron core (057).

2. The electromagnetic system according to claim 1, characterized in that: The moving iron core (057) is provided with a convex shape, and the static iron core (058) is provided with a concave shape.

3. The electromagnetic system according to claim 1, wherein: The moving iron core (057) is provided with a concave shape, and the static iron core (058) is provided with a convex shape.

4. The electromagnetic system according to any one of claims 2 to 3, characterized in that: The shape of the pit is a bell-mouth structure.

5. The electromagnetic system according to claim 4, characterized in that: The width of the convex shape gradually decreases from the outer end to the inner side.

6. The electromagnetic system according to claim 5, characterized in that: The longitudinal sections of the concave shape and the convex shape are both trapezoidal.

7. The electromagnetic system according to claim 5 or 6, characterized in that: The cross sections of the concave shape and the convex shape are both circular.

8. The electromagnetic system according to any one of claims 1 to 3, characterized in that: The contact pushing portion (023) is a push rod, and one end of the contact pushing portion (023) is mounted in a mounting hole provided in the moving iron core (057).

9. The electromagnetic system according to any one of claims 1 to 3, characterized in that: The electromagnetic system further comprises a magnetic field enhancement module, which comprises a magnetic conductive plate (055), a magnetic conductive tube (056) and a yoke (054).

10. Contactor, characterized in that: An electromagnetic system comprising any one of claims 1 to 9.

Images