Movable contact assembly

Abstract

A movable contact assembly comprises a movable contact piece, a plastic head penetrating through the movable contact piece and a spring pressing the movable contact piece downwards, the spring is a tower-type spring, and the diameter of a bottom ring of the spring is smaller than that of a top ring of the spring. The principle of the utility model is as follows: the movable contact assembly adopts the tower-type spring for resetting, the inverted triangle structure of the tower-type spring has good stability, and the tower-type spring has a compensation balance function, can automatically repair and center, and ensures the stable lifting of the movable contact assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to a relay especially a moving contact assembly. BACKGROUND

[0002] The relay generally includes a plastic head, a shell matched with the plastic head, an iron core, a coil, a static contact assembly and a moving contact assembly. For example, a relay disclosed in Chinese patent publication No. CN208240582U includes a plastic head, a shell matched with the plastic head, an iron core, a coil holder, a coil, a static contact assembly and a moving contact assembly. The coil is wound on the coil holder, the coil holder is arranged in the shell, the iron core is arranged in the coil holder, and the iron core is provided with a reset spring. The moving contact assembly includes a contact plastic head arranged above the iron core, a contact sheet arranged on the contact plastic head and a spring for driving the contact sheet to reset. The iron core is moved upward to lift the moving contact assembly and compress the spring. After the iron core is reset, the spring drives the moving contact assembly to move downward and reset by relying on the elastic force of the spring. It can be seen that the reliability of the spring directly affects the reliability of the relay. In the prior art, the spring matched with the moving contact assembly is a common spring, and the top ring and the bottom ring of the spring have the same diameter. The balance of this kind of spring is poor, and the force on both sides of the spring is uneven, which may cause the moving contact assembly to be stuck due to deviation during lifting. SUMMARY

[0003] The utility model solves the technical problems existing in the prior art.

[0004] To solve the above technical problems, the technical scheme of the utility model is as follows: a moving contact assembly includes a moving contact sheet, a plastic head penetrating the moving contact sheet and a spring for pressing the moving contact sheet downward. The spring is a tower spring, and the diameter of the bottom ring of the spring is smaller than that of the top ring. The principle of the utility model is that the moving contact assembly adopts a tower spring for resetting. The inverted triangular structure of the tower spring has good stability, a compensation balance function and automatic repair for centering, thereby ensuring the stable lifting of the moving contact assembly.

[0005] As an improvement, the moving contact sheet and the plastic head are formed by in-mold injection molding.

[0006] As an improvement, the moving contact sheet is circular, and the plastic head penetrates the center of the moving contact sheet.

[0007] As an improvement, the moving contact sheet is a high-conductivity copper sheet, and the plastic head is a high-temperature-resistant plastic part.

[0008] As an improvement, the plastic head includes a disc arranged at the bottom of the moving contact sheet, a pushing protrusion arranged at the bottom of the disc and a connecting protrusion arranged at the top of the moving contact sheet, and the lower end of the spring is sleeved on the connecting protrusion.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] The moving contact assembly uses a tower spring for reset. The inverted triangular structure of the tower spring has good stability, a compensation and balance function, and automatically corrects alignment, ensuring smooth lifting and lowering of the moving contact assembly. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of a relay.

[0012] Figure 2 This is a schematic diagram of a moving contact assembly. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] like Figure 1 As shown, a relay includes a moving contact assembly 1, stationary contact assemblies 2 disposed on both sides of the moving contact assembly 1, an iron core 3 disposed below the moving contact assembly 1, and a coil cooperating with the iron core 3.

[0015] like Figure 1 , 2 As shown, the moving contact assembly 1 includes a moving contact piece 11, a plastic head 12 passing through the moving contact piece 11, and a spring 13 pressing the moving contact piece 11 downwards. The moving contact piece 11 and the plastic head 12 are formed by in-mold injection molding, and the two are firmly connected and durable. The moving contact piece 11 is a high-conductivity copper sheet, and the plastic head 12 is a high-temperature resistant plastic part. This design can enhance the overload capacity of the relay and allow the relay to carry a larger current. The moving contact piece 11 is circular, and the plastic head 12 passes through the center of the moving contact piece 11. The plastic head 12 includes a disc 121 at the bottom of the moving contact piece 11, a pushing protrusion 122 at the bottom center of the disc 121, and a connecting protrusion 123 at the top center of the moving contact piece 11. The lower end of the spring 13 is sleeved on the connecting protrusion 123, the iron core 3 acts on the pushing protrusion 122, and the connecting protrusion 123 serves to fix the lower end of the spring 13 and keep the spring 13 in the center position of the moving contact piece. The spring 13 is a tower spring, with the bottom ring diameter smaller than the top ring diameter, and the lower ring diameter slightly larger than the diameter of the connecting protrusion 123. The principle of this invention: The moving contact assembly uses a tower spring for reset. The inverted triangular structure of the tower spring provides good stability, has a compensation and balance function, automatically corrects alignment, and ensures smooth lifting and lowering of the moving contact assembly.

Claims

1. A moving contact assembly comprising a moving contact blade, a plastic head passing through the moving contact blade, and a spring pressing the moving contact blade downward, characterized in that: The spring is a tower spring, and the diameter of the bottom ring of the spring is smaller than the diameter of the top ring.

2. A moving contact assembly according to claim 1, wherein: The movable contact and the plastic head are formed by in-mold injection.

3. A moving contact assembly as defined in claim 1, wherein: The movable contact is circular, and the plastic head passes through the center of the movable contact.

4. The movable contact assembly of claim 1, wherein: The movable contact is a high-conductivity copper sheet, and the plastic head is a high-temperature-resistant plastic part.

5. The movable contact assembly of claim 1, wherein: The plastic head includes a disc arranged at the bottom of the movable contact, a pushing protrusion arranged at the bottom of the disc, and a connecting protrusion arranged at the top of the movable contact, and the lower end of the spring is sleeved on the connecting protrusion.

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