A relay

Abstract

The utility model discloses a relay, belonging to the technical field of switches, comprising a static contact terminal, a moving contact piece, a contact pressure spring, a coil assembly and a plunger core shaft which are installed in a support cover and a shell. The moving contact piece is slidably installed in the inner cavity of the support cover between the contact pressure spring and the static contact terminal. The contact surfaces of the moving contact piece and the static contact terminal relative to each other are provided with convex points. When the moving contact piece contacts the static contact terminal, even if there are tiny foreign objects at the contact positions of the moving contact piece or the static contact terminal, the convex points on the moving contact piece can contact with the surface of the static contact terminal, thereby reducing the sensitivity of the moving contact piece and the static contact terminal to foreign objects and increasing the redundancy of the relay contact in resisting foreign objects. Compared with the prior art, the surface contact between the moving contact piece and the static contact terminal is changed to point contact, the contact area is reduced, the pressure between the moving contact piece and the static contact terminal is increased under the same acting force, and the contact is more easily turned on.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and in particular relates to a relay. Background Art

[0002] At present, the starter in the industry needs to use a relay to control the on and off of the electromagnetic switch. The common structure of a relay is generally composed of a support cover, a static contact terminal, a moving contact piece, a contact pressure spring, a contact return spring, a plunger core shaft, a stop body, a coil and a housing. The moving contact piece is a copper piece that can move freely up and down in the inner cavity formed by the support cover and the static contact terminal to control the on and off of the two static contact terminals. The upper part of the moving contact piece is the contact pressure spring, and the lower part of the moving contact piece is the plunger core shaft. The two work together to control the up and down movement of the moving contact piece. The contact surface between the moving contact piece and the static contact terminal is required to be smooth and free of burrs.

[0003] The moving contacts currently used in traditional relays have the following three problems:

[0004] 1. The moving contact is generally in sheet shape. The moving contact and the static contact terminal are designed to be in surface contact. They are sensitive to foreign matter and have high requirements for the cleanliness of parts. If there are small foreign matter on the moving contact or terminal, the relay contacts will not be able to conduct.

[0005] 2. The contact point between the moving contact piece and the static contact terminal cannot be guaranteed to always be in the same position, which will cause the contact point to be too close to the side wall of the support cover. As a result, although the plunger core shaft and the stop body are closed, the contact resistance between the two static contact terminals is large.

[0006] 3. The moving contact has too much freedom when working. The moving contact is prone to uneven force or random movement and friction with the support cover, resulting in a virtual connection between the static contact terminal and the moving contact, causing large contact resistance or voltage drop. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a relay, which reduces the sensitivity of a moving contact piece and a static contact terminal to foreign matter and increases the redundancy of the relay contact in resisting foreign matter.

[0008] In order to solve the above technical problems, the technical solution of the utility model is:

[0009] A relay comprises a stationary contact terminal, a moving contact piece, a contact pressure spring, a coil assembly and a plunger core shaft installed in a support cover and a shell, wherein the moving contact piece is slidably installed in the inner cavity of the support cover between the contact pressure spring and the stationary contact terminal, and a convex point is arranged on the contact surface of the moving contact piece relative to the stationary contact terminal.

[0010] Furthermore, the movable contact piece is a rectangular sheet-like structure, and four protrusions are provided and are respectively located at the corners of the lower end surface of the movable contact piece.

[0011] Furthermore, a boss is provided on the contact surface of the movable contact piece relative to the contact pressure spring, and the end of the contact pressure spring is sleeved on the boss.

[0012] Furthermore, the boss is arranged at the center position of the upper end surface of the moving contact piece.

[0013] Furthermore, the boss is a continuous annular boss.

[0014] Furthermore, the boss is a discontinuous annular boss.

[0015] Furthermore, the support cover includes a mounting tube portion sleeved on the outer side of the static contact terminal, and the opposite side edges of the moving contact piece are inwardly recessed arc edges, and the arc edges form a avoidance for the mounting tube portion.

[0016] Furthermore, one of the other two side edges of the movable contact piece is provided with a positioning groove for cooperating with a tooling.

[0017] Furthermore, the other two side edges of the movable contact piece are respectively provided with positioning grooves for cooperating with the tooling, and the two positioning grooves are staggeredly arranged on the two side edges of the movable contact piece.

[0018] Furthermore, adjacent edges of the movable contact pieces are transitioned through arcs.

[0019] After adopting the above technical solution, the beneficial effects of the utility model are:

[0020] Since the relay of the utility model includes a static contact terminal, a moving contact piece, a contact pressure spring, a coil assembly and a plunger core shaft installed in a support cover and a housing, the moving contact piece is slidably installed in the inner cavity of the support cover between the contact pressure spring and the static contact terminal, and convex points are arranged on the contact surfaces of the moving contact piece and the static contact terminal relative to each other. When the moving contact piece contacts the static contact terminal, even if there are tiny foreign objects at the contact position of the moving contact piece or the static contact terminal, the convex points on the moving contact piece can contact the surface of the static contact terminal, thereby reducing the sensitivity of the moving contact piece and the static contact terminal to foreign objects and increasing the redundancy of the relay contact in resisting foreign objects. Compared with the prior art, the surface contact between the moving contact piece and the static contact terminal is changed to point contact, the contact area is reduced, the pressure between the moving contact piece and the static contact terminal is increased under the same force, and the contact is easier to conduct. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the initial state of the relay of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the relay coil of the utility model in the energized state;

[0023] Figure 3 It is a structural schematic diagram of the upper end surface of the moving contact piece;

[0024] Figure 4 It is a structural schematic diagram of the lower end surface of the moving contact piece;

[0025] Figure 5 is a top view of the moving contact piece;

[0026] In the figure, 1-support cover, 11-installing tube, 2-static contact terminal, 3-contact pressure spring, 4-moving contact piece, 41-bump, 42-boss, 43-arc edge, 44-positioning groove, 5-housing, 6-coil assembly, 7-stop body, 8-contact return spring, 9-plunger core shaft. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0028] like Figure 1 and Figure 2 As shown together, a relay includes a static contact terminal 2, a moving contact piece 4, a contact pressure spring 3, a coil assembly 6 and a plunger core shaft 9 installed in a support cover 1 and a housing 5, and the moving contact piece 4 is slidably installed in the inner cavity of the support cover 1 between the contact pressure spring 3 and the static contact terminal 2.

[0029] The moving contact piece 4 is limited in the upper and lower positions by the plane inside the support cover 1 and the static contact terminal 2. The contact pressure spring 3 provides the force for the moving contact piece 4 to move downward, and the contact return spring 8 provides the force for the moving contact piece 4 to move upward. In the non-powered state, the contact return spring 8 is greater than the force of the contact pressure spring 3, so the plunger core shaft 9 supports the moving contact piece 4 and prevents it from moving up and down. When the coil assembly 6 starts to be energized, the magnetic field generated causes the plunger core shaft 9 to move downward and close with the stop body 7. At this time, the moving contact piece 4 is subjected to the force of the contact pressure spring 3 to move downward and the static contact terminal 2 is closed. The two static contact terminals 2 are connected, and the relay starts to work.

[0030] like Figure 1 and Figure 2As shown together, a convex point 41 is arranged on the contact surface opposite to the static contact terminal 2 of the moving contact piece 4. When the moving contact piece 4 contacts the static contact terminal 2, even if there is a tiny foreign object at the contact position of the moving contact piece 4 or the static contact terminal 2, the convex point 41 on the moving contact piece 4 can contact the surface of the static contact terminal 2, thereby reducing the sensitivity of the moving contact piece 4 and the static contact terminal 2 to foreign objects and increasing the redundancy of the relay contact in resisting foreign objects. Compared with the prior art, the surface contact between the moving contact piece 4 and the static contact terminal 2 is changed to point contact, the contact area is reduced, the pressure between the moving contact piece 4 and the static contact terminal 2 is increased under the same force, and the contact is easier to conduct.

[0031] like Figure 4 As shown, specifically, the moving contact piece 4 is a rectangular sheet structure, and four protrusions 41 are provided and respectively located at the corners of the lower end surface of the moving contact piece 4, which can ensure the consistency of the contact position between the moving contact piece 4 and the static contact terminal 2. There are multiple contact points between the moving contact piece 4 and the static contact terminal 2 that can resist foreign matter, further reducing the cleanliness requirements for parts and reducing the probability of a large contact resistance between the two static contact terminals 2 when the coil assembly 6 is energized.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown together, a boss 42 is provided on the contact surface relative to the moving contact piece 4 and the contact pressure spring 3, and the end of the contact pressure spring 3 is mounted on the boss 42. The boss 42 fixes the position of the contact pressure spring 3 to ensure the consistency of the contact position of the moving contact piece 4 and the contact pressure spring 3. At the same time, the displacement path of the moving contact piece 4 during operation is limited by the spring, the freedom of movement of the moving contact piece 4 during operation is reduced, and the contact between the moving contact piece 4 and the static contact terminal 2 is more stable.

[0033] Specifically, the boss 42 is arranged at the center of the upper end surface of the movable contact piece 4, that is, the contact position between the contact pressure spring 3 and the movable contact piece 4 is at the center, ensuring that the relative displacement force is uniform. In one embodiment, the boss 42 can be a continuous annular boss 42, and in another embodiment, the boss 42 can also be a discontinuous annular boss 42. When the contact pressure spring 3 is mounted on the boss 42, effective positioning of the two can be achieved.

[0034] like Figures 1 to 5 As shown together, the support cover 1 includes a mounting tube 11 sleeved on the outside of the static contact terminal 2, and the inner cavity for mounting the moving contact piece 4 can be formed between the two mounting tubes 11 and the outer wall of the support cover 1. The two opposite edges of the moving contact piece 4 are arc-shaped edges 43 that are concave inwards, and the arc-shaped edges 43 form a avoidance for the mounting tube 11 to ensure that the moving contact piece 4 is not easy to rub against the mounting tube 11 during the up and down movement. At the same time, the adjacent edges of the moving contact piece 4 are transitioned by arcs, which can avoid interference between the moving contact piece 4 and the support cover 1 during the installation process.

[0035] like Figure 5 As shown, in one embodiment, one side of the other two side edges of the moving contact piece 4 is provided with a positioning groove 44 for cooperating with the tooling, and the tooling cooperates with the positioning groove 44. When the moving contact piece 4 is installed into the support cover 1, the boss 42 faces one side of the contact pressure spring 3 to prevent the installation direction of the upper and lower end surfaces of the moving contact piece 4 from being wrong. In another embodiment, the other two side edges of the moving contact piece 4 are respectively provided with positioning grooves 44 for cooperating with the tooling, and the two positioning grooves 44 are staggered on the two side edges of the moving contact piece 4, that is, as long as the two positioning grooves 44 are not symmetrically arranged on the two side edges of the moving contact piece 4, the error prevention function can be achieved.

[0036] The relay of the utility model arranges convex points on the contact surfaces opposite to the moving contact piece and the stationary contact terminal. When the moving contact piece contacts the stationary contact terminal, even if there are tiny foreign objects at the contact positions of the moving contact piece or the stationary contact terminal, the convex points on the moving contact piece can contact the surface of the stationary contact terminal, thereby reducing the sensitivity of the moving contact piece and the stationary contact terminal to foreign objects and increasing the redundancy of the relay contacts in resisting foreign objects.

[0037] In the description of this specification, it should be understood that the descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the description of this specification, unless otherwise clearly defined, words such as "setting", "installation", and "connection" should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meaning of the above words in this utility model based on the specific content of the technical solution.

[0039] Although the specific implementation methods of the utility model are described above, those skilled in the art should understand that the described embodiments are only part of the implementation methods of the utility model, rather than all the implementation methods, which are only examples, and the protection scope of the utility model is defined by the claims. Those skilled in the art can make various changes or modifications to these implementation methods without departing from the principle and essence of the utility model and without any creative work, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A relay, comprising a stationary contact terminal (2), a moving contact piece (4), a contact pressure spring (3), a coil assembly (6) and a plunger core shaft (9) installed in a support cover (1) and a housing (5), wherein the moving contact piece (4) is slidably installed in the inner cavity of the support cover (1) between the contact pressure spring (3) and the stationary contact terminal (2), characterized in that: A convex point (41) is arranged on the contact surface of the moving contact piece (4) opposite to the stationary contact terminal (2).

2. The relay according to claim 1, characterized in that: The movable contact piece (4) is a rectangular sheet-like structure, and four protrusions (41) are provided and are respectively located at the corners of the lower end surface of the movable contact piece (4).

3. The relay according to claim 2, characterized in that: A boss (42) is provided on the contact surface of the moving contact piece (4) and the contact pressure spring (3) opposite to each other, and the end of the contact pressure spring (3) is sleeved on the boss (42).

4. The relay according to claim 3, characterized in that: The boss (42) is arranged at the center position of the upper end surface of the moving contact piece (4).

5. The relay according to claim 4, characterized in that: The boss (42) is a continuous annular boss (42).

6. The relay according to claim 4, characterized in that: The boss (42) is a discontinuous annular boss (42).

7. The relay according to claim 2, characterized in that: The support cover (1) comprises a mounting tube portion (11) sleeved on the outside of the static contact terminal (2); the opposite side edges of the moving contact piece (4) are inwardly recessed arcuate edges (43), and the arcuate edges (43) avoid the mounting tube portion (11).

8. The relay according to claim 7, characterized in that: One of the other two side edges of the moving contact piece (4) is provided with a positioning groove (44) for cooperating with a tool.

9. The relay according to claim 7, characterized in that: The other two side edges of the moving contact piece (4) are respectively provided with positioning grooves (44) for cooperating with the tooling, and the two positioning grooves (44) are staggeredly arranged on the two side edges of the moving contact piece (4).

10. The relay according to any one of claims 2 to 9, characterized in that: Adjacent edges of the moving contact piece (4) are transitioned through circular arcs.

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