CN204045416U - A shrapnel type micro switch - Google Patents

Abstract

The utility model relates to the technical field of switches, in particular to a spring plate type microswitch, which comprises a lower cover and an upper cover, wherein the lower cover is provided with an accommodating cavity, a touch mechanism and a button are arranged in the accommodating cavity, the touch mechanism comprises a spring plate mechanism, a normally open contact terminal and a normally closed contact terminal, the normally open contact terminal is provided with a first stationary contact, the normally closed contact terminal is provided with a second stationary contact, one end of a switching piece is provided with a movable contact, the movable contact is positioned between the first stationary contact and the second stationary contact, and the movable contact comprises a first movable contact and a second movable contact; the distance between the first movable contact and the first fixed contact is at least 3 mm; the distance between the second movable contact and the second fixed contact is at least 3 mm; the distance between common terminal and the normally open contact terminal is 3mm at least, the utility model discloses under the prerequisite that the casing size did not change, improve the actuating mechanism for interval increase between movable contact and the stationary contact can bear great magnitude of voltage and return circuit current value, can normally work under the condition of load.

Description

A shrapnel type micro switch

technical field

The utility model relates to the technical field of switches, in particular to a shrapnel type micro switch.

Background technique

The micro switch is a contact mechanism with a small contact interval and a quick action mechanism, which performs switching action with a specified stroke and a specified force. It is covered with a shell and has a drive rod outside. It is relatively small, so it is called micro switch, also known as sensitive switch.

The size of the shell of the micro switch is a standard size. Due to the limitation of the size of the shell, the distance between the moving contact and the static contact of the traditional micro switch is small, and the withstand voltage value and the loop current value are small. , when the loop current value and voltage value are large, the switching effect will not be triggered, and the switch will arc and turn on by itself, which will cause great damage to components, and the working of the switch under load will reduce the service life.

Only spring-type micro-switches in traditional micro switches can avoid the above problems, but the rated current of spring-type micro switches is only 3~5A, which cannot satisfy some high-power components.

Contents of the invention

The purpose of this utility model is to provide a shrapnel type micro switch for the deficiencies of the prior art. Under the premise that the size of the shell does not change, the utility model improves the touch mechanism so that the distance between the movable contact and the static contact is Increased, able to withstand larger voltage values and loop current values, able to work normally under load, and the service life is relatively increased.

In order to achieve the above purpose, a shrapnel type micro switch of the present utility model includes a lower cover and an upper cover for closing the lower cover, the lower cover is provided with a cavity, and a touch mechanism and a button are arranged in the cavity , the touch mechanism includes a shrapnel mechanism, a normally open contact terminal and a normally closed contact terminal, the normally open contact terminal is provided with a first static contact, and the normally closed contact terminal is provided with a second static contact, so The elastic piece mechanism includes a switching piece, a driving piece, a common terminal and a spring piece. A slot is arranged in the middle of the switching piece, and one end of the common terminal is passed through the slot and is engaged with the lower cover. The other end is clamped with the lower cover, one end of the driving piece is inserted through the slot and abuts against the button, the other end of the driving piece is clamped with the common terminal, and the elastic piece is arranged in the slot , one end of the elastic piece is clamped with the common terminal, one end of the elastic piece is in contact with the switching piece, and one end of the switching piece is provided with a moving contact, and the moving contact is located between the first static contact and the second static contact. Between the contacts, the movable contact includes a first movable contact and a second movable contact; when the first movable contact is disconnected from the first static contact, the first movable contact and the first static contact The distance between the points is at least 3mm; when the second moving contact is disconnected from the second static contact, the distance between the second moving contact and the second static contact is at least 3mm; the common terminal and the normally open The distance between the contact terminals is at least 3mm.

Preferably, the common terminal includes a first positioning portion and a second positioning portion that are both engaged with the lower cover, a connecting block for connecting the first positioning portion and the second positioning portion, and the connecting block and the first positioning portion The connecting part is provided with a first card slot, and the second positioning part is provided with a through hole.

Preferably, one end of the slot is provided with a first clamping block for engaging with the driving piece, and the other end of the slot is provided with a first abutting block for abutting against the elastic piece, and the first abutting block Slide rails are provided on both sides of the block.

Preferably, the driving piece includes a driving part that passes through the slot and abuts against the button, and a fixing part that engages with the common terminal, and the driving part of the driving piece is provided with a locking part that engages with the first block. In the second locking slot, the fixing part of the driving piece is provided with a second locking block that is engaged with the through hole.

Preferably, one end of the elastic sheet is provided with a third block engaged with the first slot, and the other end of the elastic sheet is provided with a second abutting block abutting against the first abutting block, and the second Both sides of the abutment block are provided with slide grooves for slide rail sliding fit.

Preferably, the first positioning part, the second positioning part and the connecting block are integrally formed.

Preferably, the driving portion of the driving piece is bent, and the bending angle is 120° to 150°.

Beneficial effects of the utility model: a shrapnel type micro switch, including a lower cover and an upper cover for closing the lower cover, the lower cover is provided with a cavity, and a touch mechanism and a button are arranged in the cavity, so The actuating mechanism includes a shrapnel mechanism, a normally open contact terminal and a normally closed contact terminal, the normally open contact terminal is provided with a first static contact, the normally closed contact terminal is provided with a second static contact, and the shrapnel The mechanism includes a switching piece, a driving piece, a common terminal and an elastic piece. There is a slot in the middle of the switching piece. One end of the common terminal is passed through the slot and is engaged with the lower cover. The other end of the common terminal It is clamped with the lower cover, one end of the driving piece is passed through the slot and abuts against the button, the other end of the driving piece is clamped with the common terminal, and the elastic piece is arranged in the slot. One end of the elastic piece is clamped with the common terminal, one end of the elastic piece is in contact with the switching piece, and one end of the switching piece is provided with a moving contact, and the moving contact is located between the first static contact and the second static contact Between, the movable contact includes a first movable contact and a second movable contact; when the first movable contact is disconnected from the first static contact, the connection between the first movable contact and the first static contact The distance between the second moving contact and the second static contact is at least 3mm; when the second moving contact is disconnected from the second static contact, the distance between the second moving contact and the second static contact is at least 3mm; the common terminal and the normally open contact The distance between the terminals is at least 3mm, which increases the distance between the moving contact and the static contact, can withstand a large voltage value and loop current value, can work normally under load, and has a relatively long service life.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the utility model with the upper cover hidden.

Fig. 2 is a schematic diagram of an exploded structure of the utility model.

Fig. 3 is a schematic cross-sectional structure diagram of the utility model when the button is not pressed.

Fig. 4 is a schematic diagram of the cross-sectional structure of the utility model when the button is pressed.

FIG. 5 is a schematic diagram of a three-dimensional structure of a common terminal of the present invention.

Fig. 6 is a schematic diagram of the three-dimensional structure of the switching sheet of the present invention.

Fig. 7 is a schematic diagram of the three-dimensional structure of the driving plate of the present invention.

Fig. 8 is a schematic diagram of the three-dimensional structure of the shrapnel of the present invention.

The reference signs are:

1—lower cover 2—upper cover 3—button 41—normally open contact terminal

411—the first static contact 42—normally closed contact terminal 421—the second static contact

51—Switch piece 511—Slot 5111—The first block

5112—the first abutment block 5113—slide rail 512—the first moving contact

513—Second moving contact 52—Drive piece 521—Drive part

5211—the second card slot 522—fixed part 5221—the second card block

53—Common terminal 531—First positioning part 532—Second positioning part

533—connection block 534—first card slot 535—through hole

54—shrapnel 541—third block 542—second contact block

543—chute.

Detailed ways

The utility model will be further described below in conjunction with accompanying drawings 1 to 8 and specific embodiments.

As shown in Figures 1 to 8, a shrapnel type micro switch includes a lower cover 1 and an upper cover 2 for closing the lower cover 1, the lower cover 1 is provided with a cavity, and the cavity is provided with Actuating mechanism and button 3, the actuating mechanism includes a shrapnel mechanism, a normally open contact terminal 41 and a normally closed contact terminal 42, the normally open contact terminal 41 is provided with a first static contact 411, and the normally closed contact The terminal 42 is provided with a second static contact 421, the spring mechanism includes a switching piece 51, a driving piece 52, a common terminal 53 and a spring piece 54, and the first positioning part 531, the second positioning part 532 and the connecting block 533 are integrally formed. A slot 511 is provided in the middle of the switching piece 51, one end of the common terminal 53 is inserted through the slot 511 and is engaged with the lower cover 1, and the other end of the common terminal 53 is engaged with the lower cover 1 One end of the driving piece 52 is passed through the slot 511 and abuts against the button 3 , the other end of the driving piece 52 is engaged with the common terminal 53 , and the elastic piece 54 is arranged in the slot 511 , one end of the elastic piece 54 is clamped with the common terminal 53, one end of the elastic piece 54 is in contact with the switch piece 51, and one end of the switch piece 51 is provided with a movable contact, and the movable contact is located at the first static contact Between the point 411 and the second static contact 421, the movable contact includes a first movable contact 512 and a second movable contact 513; when the first movable contact 512 is disconnected from the first static contact 411, the The distance between the first movable contact 512 and the first static contact 411 is at least 3mm; when the second movable contact 513 is disconnected from the second static contact 421, the second movable contact 513 and the second static contact The distance between the contacts 421 is at least 3 mm; the distance between the common terminal 53 and the normally open contact terminal 41 is at least 3 mm.

In this embodiment, by improving the connection structure of the switching piece 51, the driving piece 52, the common terminal 53 and the elastic piece 54, when the first moving contact 512 is disconnected from the first static contact 411, the first moving contact 512 and the second The distance between a static contact 411 is at least 3mm; when the second movable contact 513 is disconnected from the second static contact 421, the distance between the second movable contact 513 and the second static contact 421 is at least 3mm; The distance between the terminal 53 and the normally open contact terminal 41 is at least 3mm, and the distance between the moving contact and the first static contact 411 and the second static contact 421 is equivalent to the increase of the traditional shrapnel type micro switch , so that the utility model can bear a larger voltage value and loop current value, and can work normally under load. The rated current of the utility model is 12A, which is higher than that of the spring type micro switch, and can satisfy some power requirements. For large components, on the premise that the size of the shell does not change, the utility model improves the contact mechanism so that the distance between the moving contact and the static contact increases, which can withstand larger voltage values and loop current values, and can It works normally under load, and the service life is relatively increased.

As shown in FIGS. 3 to 8 , in this embodiment, the common terminal 53 includes a first positioning portion 531 and a second positioning portion 532 that are both engaged with the lower cover 1 , and are used to connect the first positioning portion 531 and the second positioning portion 531 . The connecting block 533 of the second positioning part 532, the connection between the connecting block 533 and the first positioning part 531 is provided with a first card slot 534, the second positioning part 532 is provided with a through hole 535, and the slot 511 One end is provided with a first block 5111 for engaging with the driving piece 52, and the other end of the slot 511 is provided with a first abutment block 5112 for abutting with the elastic piece 54. The first abutment block 5112 Slide rails 5113 are provided on both sides, and the driving piece 52 includes a driving part 521 that passes through the slot 511 and abuts against the button 3 and a fixing part 522 that engages with the common terminal 53. The driving piece 52 The driving part 521 is provided with a second locking slot 5211 that engages with the first locking block 5111 , the fixing portion 522 of the driving piece 52 is provided with a second locking block 5221 that engages with the through hole 535 , and one end of the elastic piece 54 A third clamping block 541 is provided that engages with the first clamping slot 534, and the other end of the elastic piece 54 is provided with a second contacting block 542 that contacts the first contacting block 5112, and the second contacting block Both sides of the 542 are provided with slide rails 5113 sliding slots 543, the operation steps of the utility model: press the button 3, the button 3 will push the driving piece 52 to move downward, and the driving piece 52 drives the switching piece 51 to move downward together At this time, the first moving contact 512 is connected to the first static contact 411, the second moving contact 513 is disconnected from the second static contact 421, the button 3 is released, and the elastic piece 54 and the driving piece 52 are used for reset. , at this time the second movable contact 513 is closed with the second static contact 421, and the first movable contact 512 is disconnected with the first static contact 411. This structural setting is beneficial to increase the firmness of the connection between the components and improve The life of the key increases the number of times the switch is used.

In this embodiment, the driving part 521 of the driving piece 52 is bent and set. As the best implementation mode, its bending angle is 135 degrees. If the bending angle of the driving piece 52 is too small, press the button 3, the button 3 will push the driving piece 52 to move downward, and the driving piece 52 will stop displacement after hitting the inner shell of the upper and lower cover 1. Since the distance between the moving contact and the static contact is relatively large, when the driving piece 52 hits the inner shell of the upper and lower cover 1 Behind the inner shell, the movable contact and the static contact may not be closed; if the bending angle of the driving piece 52 is too large, the elastic reset effect of the driving piece 52 is not strong, so that the switching piece 51 cannot be reset in time. The movable contact is still in a conduction state with the first static contact 411 or the second static contact 421 , which will greatly damage the components.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (7)

1. A shrapnel type micro switch, comprising a lower cover (1) and an upper cover (2) for closing the lower cover (1), the lower cover (1) is provided with a cavity, and the cavity is set There is an actuating mechanism and a button (3), characterized in that the actuating mechanism includes a shrapnel mechanism, a normally open contact terminal (41) and a normally closed contact terminal (42), and the normally open contact terminal (41) is set The first static contact (411), the normally closed contact terminal (42) is provided with a second static contact (421), and the spring mechanism includes a switching piece (51), a driving piece (52), a common terminal (53 ) and shrapnel (54), the middle part of the switching piece (51) is provided with a slot (511), and one end of the common terminal (53) is passed through the slot (511) and is locked with the lower cover (1) connected, the other end of the common terminal (53) is clamped with the lower cover (1), and one end of the driving piece (52) is passed through the slot (511) and abuts against the button (3) , the other end of the driving piece (52) is engaged with the common terminal (53), the elastic piece (54) is set in the slot (511), and one end of the elastic piece (54) is engaged with the common terminal (53) One end of the shrapnel (54) abuts against the switching piece (51), and one end of the switching piece (51) is provided with a moving contact, and the moving contact is located between the first static contact (411) and the second Between two static contacts (421), the movable contacts include a first movable contact (512) and a second movable contact (513); When the first moving contact (512) is disconnected from the first static contact (411), the distance between the first moving contact (512) and the first static contact (411) is at least 3mm; When the second moving contact (513) is disconnected from the second static contact (421), the distance between the second moving contact (513) and the second static contact (421) is at least 3mm; The distance between the common terminal (53) and the normally open contact terminal (41) is at least 3mm. 2. A shrapnel type micro switch according to claim 1, characterized in that: the common terminal (53) includes a first positioning part (531) and a second positioning part (531) that are both engaged with the lower cover (1). part (532), a connection block (533) for connecting the first positioning part (531) and the second positioning part (532), the connection between the connection block (533) and the first positioning part (531) is provided with The first locking slot (534), the second positioning part (532) is provided with a through hole (535). 3. A shrapnel type micro switch according to claim 1, characterized in that: one end of the slot (511) is provided with a first block (5111) for engaging with the driving piece (52), The other end of the slot (511) is provided with a first abutment block (5112) for abutting against the elastic piece (54), and slide rails (5113) are provided on both sides of the first abutment block (5112) . 4. A shrapnel type micro switch according to claim 2 or 3, characterized in that: the driving piece (52) includes a hole that penetrates the slot (511) and abuts against the button (3). The driving part (521) and the fixing part (522) that is engaged with the common terminal (53), the driving part (521) of the driving piece (52) is provided with a second card that is engaged with the first block (5111) slot (5211), the fixing part (522) of the driving piece (52) is provided with a second clamping block (5221) clamped with the through hole (535). 5. A shrapnel type micro switch according to claim 2 or 3, characterized in that: one end of the shrapnel (54) is provided with a third locking block (541) which is engaged with the first slot (534) ), the other end of the elastic piece (54) is provided with a second abutment block (542) abutting against the first abutment block (5112), and the two sides of the second abutment block (542) are provided with sliding Rail (5113) slidingly fits chute (543). 6. The shrapnel type micro switch according to claim 2, characterized in that: the first positioning part (531), the second positioning part (532) and the connecting block (533) are formed integrally. 7 . The shrapnel type micro switch according to claim 4 , characterized in that: the driving part ( 521 ) of the driving piece ( 52 ) is bent, and the bending angle is 120° to 150°.