Small-size self-cleaning magnetic blow-out microswitch

Abstract

The utility model discloses a small-size self-cleaning magnetic blow-out microswitch, and belongs to the technical field of electrical switches. The device comprises a base and an upper cover which are connected with each other, and is characterized in that a pressing piece is hinged to the upper cover, a guide rod is arranged on the upper side of the upper cover in a matched mode through a shaft hole, the lower end of the guide rod extends into the base, and the upper end of the guide rod corresponds to the bottom side of the pressing piece and can be pressed by the pressing piece to move downwards. A common terminal, a normally-open terminal and a normally-closed terminal are connected to the base, a normally-open contact, in the base, of the normally-open terminal is located above a normally-closed contact, in the base, of the normally-closed terminal, and an action elastic piece is connected to the common terminal located in the base. And a common contact at the front end part of the action elastic sheet is positioned between the normally open contact and the normally closed contact. According to the utility model, functions of self-cleaning, magnetic quenching and forced breaking can be realized at the same time, so that the contact is more reliable and safer, and the breaking capacity is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical switches, and particularly relates to a small-volume self-cleaning magnetic blow micro switch. Background Art

[0002] A micro switch is a contact mechanism with a tiny contact interval and a quick-acting mechanism, which performs switch actions with a specified stroke and a specified force, and is covered with a housing and has a driving rod on the outside. Because the contact spacing of its switch is relatively small, it is named a micro switch, also called a quick-acting switch.

[0003] Micro switches are used for automatic control and safety protection in equipment that needs to frequently switch circuits, and are widely used in electronic equipment, instruments, mines, power systems, household appliances, electrical equipment, and military fields such as aerospace, aviation, ships, missiles, and tanks. They have been widely used in the above fields. Although the switches are small, they play an irreplaceable role.

[0004] At present, most of the micro switches on the market do not have a self-cleaning function for contacts, and there is a risk of poor contact. Moreover, most of them are screw-pressed wiring methods, which are cumbersome, time-consuming, and prone to loosening, resulting in poor wiring and causing failures. And existing micro switches generally have defects such as low on-off capacity and small load current when the volume is small. Summary of the Utility Model

[0005] The utility model aims at the above problems, makes up for the deficiencies of the prior art, and provides a small-volume self-cleaning magnetic blow micro switch; the utility model can simultaneously have the functions of self-cleaning, magnetic blow arc extinguishing, and forced breaking, making the contact more reliable and safe and improving the breaking capacity.

[0006] To achieve the above purpose, the utility model adopts the following technical solutions.

[0007] The utility model provides a small-volume self-cleaning magnetic blow micro switch, which includes a base and an upper cover connected to each other. The upper cover is hinged with a pressing piece, a guide rod is arranged on the upper side of the upper cover through shaft hole fit, the lower end of the guide rod extends into the base, the upper end of the guide rod corresponds to the bottom side of the pressing piece and can move downward under the downward pressure of the pressing piece, a common terminal, a normally open terminal, and a normally closed terminal are connected to the base, the normally open contact of the normally open terminal in the base is located above the normally closed contact of the normally closed terminal in the base, an action elastic piece is connected to the common terminal inside the base, the common contact at the front end of the action elastic piece is located between the normally open contact and the normally closed contact, and the end of the guide rod in the base corresponds to the action elastic piece.

[0008] Further, magnetic blocks are provided on both the front and rear sides of the upper cover corresponding to the area between the normally open contact and the normally closed contact.

[0009] Further, the actuating spring piece is clamped into the fulcrum groove provided in the common terminal in the base through the upper fulcrum and the lower fulcrum in the middle thereof, so that the actuating spring piece can achieve elastic movement in the up and down amplitude.

[0010] Further, a forced breaking block is provided on the guide rod, and the front end of the forced breaking block has a downwardly protruding forced breaking contact.

[0011] Advantages of the present utility model.

[0012] The contact of the present utility model can generate a certain frictional movement at the moment of contact, which can remove foreign matters, oxide layers, etc. on the contact surface, making the contact more reliable; the powerful magnetic block can have the function of magnetic arc extinguishing, can multiply the breaking capacity of the switch and improve the electrical life, especially in harsh operating conditions such as DC and inductive loads, the effect is particularly obvious; the setting of the forced breaking block can forcibly separate the contacts by mechanical force in the case where the contacts are stuck due to overload, so as to maintain a high safety and reliability. Description of the drawings

[0013] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0014] Figure 1 It is a schematic diagram of the internal structure of the present utility model.

[0015] Figure 2 It is a schematic diagram of the actuating spring piece of the present utility model in the free state.

[0016] Figure 3 It is a schematic diagram of the actuating spring piece of the present utility model in the actuated state.

[0017] Figure 4 It is a schematic diagram of the external structure of the present utility model.

[0018] Reference numerals in the drawings: 1 is the base, 2 is the upper cover, 3 is the pressing piece, 4 is the guide rod, 5 is the common terminal, 6 is the normally open terminal, 7 is the normally closed terminal, 8 is the normally open contact, 9 is the normally closed contact, 10 is the actuating spring piece, 11 is the common contact, 12 is the magnetic block, 13 is the upper fulcrum, 14 is the lower fulcrum, 15 is the forced breaking block, 16 is the forced breaking contact. Specific embodiments

[0019] As shown in the accompanying drawings, this embodiment provides a magnetically blown microswitch with a small volume and self-cleaning function, which includes a base 1 and an upper cover 2 connected to each other. A pressing piece 3 is hinged on the upper cover 2, and external force can be used to press and move the pressing piece 3 by a certain amplitude.

[0020] A guide rod 4 is arranged on the upper side of the upper cover 2 through shaft-hole fit. The lower end of the guide rod 4 extends into the base 1, and the upper end of the guide rod 4 corresponds to the bottom side of the pressing piece 3 and can be moved downward by the downward pressing of the pressing piece 3.

[0021] A common terminal 5, a normally open terminal 6 and a normally closed terminal 7 are connected to the base 1. The normally open contact 8 of the normally open terminal 6 in the base 1 is located above the normally closed contact 9 of the normally closed terminal 7 in the base 1.

[0022] An actuating spring piece 10 is connected to the common terminal 5 inside the base 1. The structure of the actuating spring piece 10 is a well-known structure (as shown in the figure), and its specific structure will not be elaborated here.

[0023] The actuating spring piece 10 is clamped into the fulcrum groove provided on the common terminal 5 in the base 1 through the upper fulcrum 13 and the lower fulcrum 14 in the middle thereof, so that the actuating spring piece 10 can perform elastic actions with an up-and-down amplitude.

[0024] The common contact 11 at the front end of the actuating spring piece 10 is located between the normally open contact 8 and the normally closed contact 9. The end of the guide rod 4 inside the base 1 corresponds to the actuating spring piece 10, so that the actuating spring piece 10 can be pressed after the guide rod 4 moves downward.

[0025] By pressing the pressing piece 3 to press the guide rod 4, the actuating spring piece 10 generates elastic deformation and stores energy during the pressing process. When the deformation reaches the dead point, the maximum energy is stored. After continuing to press and exceeding the dead point, the spring force of the actuating spring piece 10 will be instantly released and move downward quickly. The common contact 11 on the actuating spring piece 10 quickly contacts the normally open contact 8 on the normally open terminal 6, forming a circuit between the common terminal 5 and the normally open terminal 6.

[0026] After the pressing is withdrawn, the microswitch rebounds and resets through the elastic force of the actuating spring piece 10, generates elastic deformation and stores energy. When the deformation reaches the dead point, the maximum energy is stored. After continuing to rebound and exceeding the dead point, the spring force of the actuating spring piece 10 is instantly released and moves upward quickly. The common contact 11 on the actuating spring piece 10 quickly contacts the normally closed contact 9 on the normally closed terminal 7, forming a circuit between the common terminal 5 and the normally closed terminal 7.

[0027] When pressing or resetting the micro switch, the deformations generated by the upper fulcrum 13 and the lower fulcrum 14 of the action elastic piece 10 in its own structure are different (the deformation of the upper fulcrum 13 is large, and the deformation of the lower fulcrum 14 is almost none), which will generate an action of pulling the common contact 11 on the action elastic piece 10, and then generate a certain amplitude of horizontal movement, so that a certain horizontal friction movement will be generated at the moment of contact of the contacts, which can remove foreign matters, oxide layers, etc. on the contact surface and make the contact reliable. Moreover, the wiring terminal of this micro switch adopts a plug-in wiring method, which is convenient for wiring, firm and reliable, and not easy to loosen.

[0028] Magnets 12 are provided on both the front and rear sides of the upper cover 2 corresponding to the area between the normally open contact 8 and the normally closed contact 9 at the same time, and can generate a strong magnetic field in the contact area. When an arc is generated during the on-off control process of the micro switch connected to an electrical load, the strong magnetic field can instantly "blow out" the arc to achieve the magnetic blow function. Therefore, the micro switch of this utility model patent has a high breaking capacity and electrical life.

[0029] A forced breaking block 15 is provided on the guide rod 4, and the front end of the forced breaking block 15 has a downwardly convex forced breaking contact 16. Even if the contacts are stuck due to overload, they can be forced to separate by mechanical pressing and the thrust of the forced breaking contacts, so as to maintain high safety and reliability.

[0030] It can be understood that the above specific description of the present utility model is only used to illustrate the present utility model and is not limited to the technical solutions described in the embodiments of the present utility model. Those of ordinary skill in the art should understand that the present utility model can still be modified or equivalently replaced to achieve the same technical effect; as long as it meets the use requirements, it is within the protection scope of the present utility model.

Claims

1. A small-volume self-cleaning magnetic blow microswitch, comprising a base (1) and an upper cover (2) connected to each other, characterized in that, A pressing piece (3) is hinged on the upper cover (2). A guide rod (4) is arranged on the upper side of the upper cover (2) through shaft hole fit. The lower end of the guide rod (4) extends into the base (1). The upper end of the guide rod (4) corresponds to the bottom side of the pressing piece (3) and can move downward under the downward pressure of the pressing piece (3). A common terminal (5), a normally open terminal (6) and a normally closed terminal (7) are connected to the base (1). The normally open contact (8) of the normally open terminal (6) in the base (1) is located above the normally closed contact (9) of the normally closed terminal (7) in the base (1). An actuating spring piece (10) is connected to the common terminal (5) inside the base (1). The common contact (11) at the front end of the actuating spring piece (10) is located between the normally open contact (8) and the normally closed contact (9). The end of the guide rod (4) inside the base (1) corresponds to the actuating spring piece (10).

2. The magnetically blown microswitch with small volume and self-cleaning according to claim 1, characterized in that, Magnets (12) are arranged on both the front and rear sides of the upper cover (2) corresponding to the area between the normally open contact (8) and the normally closed contact (9).

3. The miniaturized self-cleaning magnetic blow microswitch according to claim 1, characterized in that, The actuating spring piece (10) is clamped into the fulcrum groove arranged on the common terminal (5) in the base (1) through the upper fulcrum (13) and the lower fulcrum (14) in the middle thereof, so that the actuating spring piece (10) can perform elastic actions with an up-and-down amplitude.

4. A small-volume self-cleaning magnetic blow microswitch according to claim 1, characterized in that, A forced breaking block (15) is arranged on the guide rod (4). The front end of the forced breaking block (15) has a downward protruding forced breaking contact (16).

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