CN114141588A - Circuit protection switch and electrical equipment - Google Patents

Abstract

The utility model provides a circuit protection switch belongs to the electrical equipment field. The circuit protection switch comprises a base, a conductive sheet assembly, a button and a heart-shaped groove mechanism; the conducting strip assembly comprises a first static contact and a bimetallic strip, the first static contact is connected with the base, one end of the bimetallic strip is connected with the base, and the other end of the bimetallic strip is opposite to the first static contact; the button is positioned on one side of the bimetallic strip away from the first static contact; the heart-shaped groove mechanism is positioned between the bimetallic strip and the button, and the shifting piece is connected with the heart-shaped groove mechanism and the bimetallic strip and used for separating or contacting the bimetallic strip and the first static contact piece in the process of pressing the button. By pressing the switch, the on-off state of the circuit can be changed. And the bimetallic strip can deform when the circuit is overloaded, so that the bimetallic strip is separated from the first static contact to cut off the circuit, the circuit protection switch can control the on-off of the circuit through the button, and the circuit can be cut off when the circuit is overloaded, so that the circuit is prevented from being damaged due to the overload of the circuit.

Description

Circuit protection switch and electrical equipment

Technical Field

The disclosure relates to the field of electrical equipment, in particular to a circuit protection switch and electrical equipment.

Background

A circuit protection switch is a switching device that is triggered by pressing. By pressing the button, the button is pressed or bounced, so that the on/off of the circuit can be switched.

The circuit protection switch has a simple structure, a static contact piece and a movable contact piece are arranged in the circuit protection switch, and the movable contact piece can move under the action of the button. When the button is in the bounce state, the movable contact piece is separated from the static contact piece, so that the circuit is cut off. When the button is in a pressed state, the movable contact piece is contacted with the static contact piece, so that the circuit is connected.

Because the on-off of the movable contact is controlled by the button, the movable contact cannot protect the circuit from overload, so in order to prevent the circuit from overload, an overload protector or a fuse is usually required to be arranged in the circuit, which causes the increase of parts in the circuit, the increase of welding points and the complexity of a circuit.

Disclosure of Invention

The embodiment of the disclosure provides a circuit protection switch and electrical equipment, which can prevent a circuit from being overloaded. The technical scheme is as follows:

in one aspect, an embodiment of the present disclosure provides a circuit protection switch, which includes a base, a conductive sheet assembly, a button, a heart-shaped groove mechanism, and a paddle;

the conducting strip assembly comprises a first static contact and a bimetallic strip, the first static contact is connected with the base, one end of the bimetallic strip is connected with the base, and the other end of the bimetallic strip is opposite to the first static contact;

the button is positioned on one side of the bimetallic strip, which is far away from the first static contact;

the heart-shaped groove mechanism is positioned between the bimetallic strip and the button, is connected with the button and is used for locking the button in a bouncing state or a pressing state;

the poking piece is connected with the heart-shaped groove mechanism and the bimetallic strip and used for enabling the bimetallic strip to be separated from or contacted with the first static contact piece in the process of pressing the button.

Optionally, the toggle piece is configured to rotate in a first direction when the button is pressed in a sprung state, so that the bimetal piece is in contact with the first static contact piece;

when the button is pressed in a pressed state, the button rotates along the first direction to enable the bimetallic strip to be in contact with the first static contact or rotates along a second direction to enable the bimetallic strip to be separated from the first static contact, and the second direction is opposite to the first direction.

Optionally, the heart-shaped groove mechanism comprises a projection and a connecting rod, the bottom surface of the projection is connected with the base, the top surface of the projection is provided with a track groove, one end of the connecting rod is provided with a bent part, the bent part is located in the track groove, and the other end of the connecting rod is connected with the button;

the shifting piece is rotatably connected with the protruding block, and the bent part moves along the track groove in the process of pressing the button so as to drive the shifting piece to rotate.

Optionally, along the first direction, the trajectory groove has a first inflection point, a second inflection point, a third inflection point and a fourth inflection point;

when the bent part is located at the first inflection point, the button is in the bouncing state, and the bimetallic strip is separated from the first static contact;

when the bent part is positioned at the second inflection point, the bimetallic strip is contacted with the first static contact piece;

when the bending part is positioned at the third inflection point, the button is in a pressed state;

when the bending part is located at the fourth inflection point, the bimetallic strip is separated from the first static contact.

Optionally, a connection portion of the pick and the bump is located on one side of the third inflection point close to the bimetal, and is located between the second inflection point and the fourth inflection point.

Optionally, the poking piece comprises a poking part and a main body part, the poking part is respectively connected with the main body part and the bimetallic strip, the main body part is opposite to and connected with the top surface of the bump, the main body part is provided with an opening matched with the track groove, and the opening is sleeved outside the bending part.

Optionally, the rotation axis of the main body part is located at one side of the track groove and the opening close to the bimetallic strip;

when the button is pressed down in a pressing state, the poking sheet rotates along the first direction, and the interface is a plane where the rotating axis and the third inflection point are located; when the intersection line of the first guide side wall and the second guide side wall is positioned on one side of the interface close to the second inflection point, and the button is pressed in a pressed state, the poking sheet rotates along the second direction.

Optionally, one end of the poking part, which is far away from the main body part, is provided with a bayonet, and the bayonet is clamped with the bimetallic strip.

Optionally, the button includes a key cap and a light-emitting structure, the light-emitting structure is located on one side of the key cap close to the heart-shaped groove mechanism, the conducting strip assembly further includes a second static contact, the second static contact is connected with the base, the circuit protection switch further includes a first elastic conducting piece and a second elastic conducting piece, the first elastic conducting piece is located between the bimetallic strip and the button and is respectively connected with the bimetallic strip and the light-emitting structure, and the second elastic conducting piece is located between the second static contact and the button and is respectively connected with the second static contact and the light-emitting structure.

Optionally, the first and second resilient conductive members are on opposite sides of the heart-shaped slot mechanism.

Optionally, the light emitting structure includes a circuit board and a light emitting device, the circuit board is located on one side of the key cap close to the heart-shaped groove mechanism, the light emitting device is located on one side of the circuit board close to the key cap, and the first elastic conductive member and the second elastic conductive member are connected to one side of the circuit board far away from the key cap.

Optionally, the button further comprises a light guide member, the key cap has a light hole, and the light guide member is located in the light hole and opposite to the light emitting device.

On the other hand, the embodiment of the present disclosure further provides an electrical apparatus, which includes the circuit protection switch as described in the foregoing aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

through set up heart-shaped groove mechanism and bimetallic strip in circuit protection switch, heart-shaped groove mechanism links to each other with the button, and the plectrum links to each other with heart-shaped groove mechanism and bimetallic strip for through press switch, can drive bimetallic strip and first static contact separation or contact by the plectrum, with the break-make state that changes the circuit. And the bimetallic strip can deform when the circuit is overloaded, so that the bimetallic strip is separated from the first static contact to cut off the circuit, the circuit protection switch can control the on-off of the circuit through the button, and the circuit can be cut off when the circuit is overloaded, so that the circuit is prevented from being damaged due to the overload of the circuit.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a circuit protection switch provided in an embodiment of the present disclosure;

fig. 2 is an exploded schematic diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 3 is a schematic structural diagram of a circuit protection switch provided in an embodiment of the present disclosure;

fig. 4 is a state diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 5 is a state diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 6 is a state diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 7 is a state diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 8 is a schematic structural diagram of a circuit protection switch provided in an embodiment of the present disclosure;

fig. 9 is a state diagram of a circuit protection switch according to an embodiment of the disclosure;

fig. 10 is a state diagram of a circuit protection switch provided by an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a bimetal provided by the embodiment of the present disclosure;

fig. 12 is an exploded schematic view of a button according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

Fig. 1 is a schematic structural diagram of a circuit protection switch according to an embodiment of the present disclosure. As shown in fig. 1, the circuit protection switch includes a switch body 100 and a push button 30. The push button 30 is connected to the switch body 100, and the push button 30 can be pushed or popped up with respect to the switch body 100.

As shown in fig. 1, the switch main body 100 includes a base 10, a conductive sheet assembly 20, a heart-shaped slot mechanism 40, and a paddle 43.

The base 10 includes a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 are relatively buckled to form an accommodating space for accommodating the conductive sheet assembly 20, the heart-shaped slot mechanism 40 and the pull tab 43, and the base 10 provides a corresponding installation base and insulation protection for the button 30, the conductive sheet assembly 20, the heart-shaped slot mechanism 40 and the pull tab 43.

The conductive plate assembly 20 includes a first stationary contact plate 21 and a bimetal plate 22. The first stationary contact piece 21 is connected to the base 10. The bimetal 22 has one end connected to the base 10 and the other end opposite to the first static contact 21.

Fig. 2 is an exploded schematic structure diagram of a circuit protection switch according to an embodiment of the present disclosure. As shown in fig. 2, the first static contact piece 21 has a static contact 211 at a position opposite to the bimetal piece 22, and the bimetal piece 22 has a movable contact 221 at a position opposite to the first static contact piece 21. When the bimetal strip 22 contacts the first static contact 21, the movable contact 221 contacts the static contact 211 to close the circuit, and when the bimetal strip 22 is separated from the first static contact 21, the movable contact 221 is separated from the static contact 211 to open the circuit.

Illustratively, the fixed contact 211 and the movable contact 221 are both silver contacts, and the metal silver has good electrical conductivity, so that the resistance between the fixed contact 211 and the movable contact 221 is low, and danger caused by over-high temperature at the contact position of the fixed contact 211 and the movable contact 221 is avoided.

A portion of the first stationary contact 21 protrudes with respect to the base 10 to facilitate connection of the wires. A terminal lug 23 is connected to one end of the bimetal 22 connected to the base 10. For example, the bimetal 22 and the lug plate 23 are connected by a copper rivet 231. A portion of the terminal metal piece 23 protrudes with respect to the base 10 to facilitate connection of the lead. For example, the first static contact 21 and the bimetal 22 are connected in series in the live line. The portion of the first stationary contact 21 outside the base 10 is connected to the live wire and the terminal plate 23 is connected to the wire connected to the electric appliance.

The push button 30 is located on the side of the bimetal blade 22 remote from the first static contact 21. The heart-shaped slot mechanism 40 is located between the bimetal blade 22 and the push button 30 and is connected to the push button 30. The heart-shaped slot mechanism 40 is used to lock the push button 30 in either the sprung or depressed state. When the push button 30 is pressed, and when released, the push button 30 springs up to be in a sprung state, and at this time, the push button 30 is pressed again, and when released, the heart-shaped groove mechanism 40 locks the push button 30 so that the push button 30 cannot spring up and is held in the pressed state.

The pick 43 is connected to the heart-shaped groove mechanism 40 and the bimetal 22 for separating or contacting the bimetal 22 from the first static contact 21 during pressing of the button 30.

Through set up heart-shaped groove mechanism and bimetallic strip in circuit protection switch, heart-shaped groove mechanism links to each other with the button, and the plectrum links to each other with heart-shaped groove mechanism and bimetallic strip for through press switch, can drive bimetallic strip and first static contact separation or contact by the plectrum, with the break-make state that changes the circuit. And the bimetallic strip can deform when the circuit is overloaded, so that the bimetallic strip is separated from the first static contact to cut off the circuit, the circuit protection switch can control the on-off of the circuit through the button, and the circuit can be cut off when the circuit is overloaded, so that the circuit is prevented from being damaged due to the overload of the circuit.

In the disclosed embodiment, the pick 43 is configured to rotate in a first direction when the push button 30 is pressed in the sprung state, bringing the bimetal 22 into contact with the first static contact 21; when the push button 30 is pressed in a pressed state, it is rotated in a first direction to bring the bimetal 22 into contact with the first stationary contact 21, or rotated in a second direction to separate the bimetal 22 from the first stationary contact 21, the second direction being opposite to the first direction.

That is, when the circuit is in the off state, the push button 30 is pushed to close the circuit protection switch, so that the dial 43 is rotated to drive the bimetal 22, and the bimetal 22 is brought into contact with the first static contact 21 to close the circuit. When the circuit protection switch is turned off by pressing the button 30 while the circuit is on, the driver 43 is rotated in the opposite direction to drive the bimetal 22, so that the bimetal 22 is separated from the first static contact 21 to break the circuit. When the circuit is disconnected due to overload, the push button 30 is pushed to rotate the dial 43, so that the bimetal 22 is reset, the bimetal 22 and the first static contact 21 are restored to contact with each other, and the circuit is reconnected.

As shown in fig. 2, the heart-shaped slot mechanism 40 includes a projection 41 and a link 42. The bump 41 is connected to the base 10 at the bottom and has a track slot 411 at the top. The top surface of the bump 41 has a heart-shaped groove, a protrusion is provided in the middle of the groove, and the side wall of the heart-shaped groove and the side wall of the protrusion form a track slot 411.

The bump 41 protrudes from the first housing 11, and in a height direction in which the bump 41 protrudes relative to the first housing 11, a surface of the bump 41 away from the first housing 11 is a top surface of the bump 41, and a surface opposite to the top surface is a bottom surface of the bump 41.

One end of the link 42 has a kink portion 421, the kink portion 421 is located in the track slot 411, and the other end of the link 42 is connected to the button 30.

The pulling plate 43 is rotatably connected to the top surface of the protrusion 41, the pulling plate 43 is connected to the bimetal 22, and the bending portion 421 moves along the track slot 411 to drive the pulling plate 43 to rotate during the process of pressing the button 30.

During the pressing of the button 30, the button 30 drives the link 42, so that the bending portion 421 of the link 42 moves in the track slot 411. The kink portion 421 moves to different positions of the track slot 411, so that the button 30 is in different states, such as a pressed state and a sprung state. During the movement of the connecting rod 42, the bimetal 22 is driven by the shifting piece 43, so that the bimetal 22 is separated from or contacted with the first static contact piece 21. Thus, by pressing the button 30, it is possible to make the moving contact 221 contact with the stationary contact 211 to make the electric circuit on, or to make the moving contact 221 separate from the stationary contact 211 to break the electric circuit off. When the load of the circuit is too high, the bimetal 22 deforms, the movable contact 221 is separated from the fixed contact 211, and the switch is disconnected, and then the push button 30 is pressed to drive the shifting piece 43 to reset the bimetal 22.

Fig. 3 is a schematic structural diagram of a circuit protection switch according to an embodiment of the present disclosure. At least the second housing 12 and the paddle 43 are omitted from fig. 3. As shown in fig. 3, the track slot 411 is heart-shaped. In a first direction, e.g., counterclockwise as shown in fig. 3, the tracking slot 411 has a first inflection point 411a, a second inflection point 411b, a third inflection point 411c, and a fourth inflection point 411 d. The second inflection point 411b and the fourth inflection point 411d are respectively located at both sides of a line connecting the first inflection point 411a and the third inflection point 411 c. The first inflection point 411a and the third inflection point 411c are two stable positions, and when the kink portion 421 of the link 42 is located at the two stable positions, the push button 30 can be locked. The second inflection point 411b and the fourth inflection point 411d are two transition positions, and when the button 30 is pressed by an external force, the bending portion 421 of the link 42 can move to the second inflection point 411b or the fourth inflection point 411d, and after the external force is removed, the bending portion 421 of the link 42 can move to the third inflection point 411c or the first inflection point 411a along the track slot 411.

Fig. 4 to 7 are schematic diagrams of states of a circuit protection switch according to an embodiment of the disclosure. Fig. 4 to 7 show the cycle of the operation when the button 30 is pressed without overload on the circuit. The figure shows a rough movement locus of the kink portion 421 in the process of pressing the button 30. The button 30 is in a sprung state (as shown in fig. 4), the button 30 is depressed (as shown in fig. 5), the button 30 is locked in the depressed state (as shown in fig. 6) after release, the button 30 is depressed again (as shown in fig. 7), and the button 30 returns to the sprung state (as shown in fig. 4) after release.

As shown in fig. 4, when the bent portion 421 of the link 42 is located at the first inflection point 411a, the push button 30 is in the sprung state, and the bimetal 22 is separated from the first static contact piece 21. At this time, the circuit protection switch is in an open state, and the circuit is cut off.

As shown in fig. 5, when the bent portion 421 of the connecting rod 42 is located at the second inflection point 411b, the bimetal 22 contacts the first static contact piece 21. When the button 30 is pressed by an external force, the kink portion 421 moves to the second inflection point 411b, the button 30 is in an unstable state, and the bimetal 22 is reset by the toggle piece 43, so that the circuit is turned on again.

As shown in fig. 6, when the bent portion 421 of the link 42 is located at the third inflection point 411c, the push button 30 is pressed, and the bimetal 22 contacts the first static contact piece 21. When the push button 30 is in the sprung state, the push button 30 is pressed to cause the kink portion 421 to reach the second inflection point 411 b. When the external force is removed, the kink portion 421 moves to the third inflection point 411c, and the heart groove mechanism 40 locks the button 30 in the pressed state. When the load in the circuit is small and is not enough to deform the bimetal 22, the bimetal 22 contacts with the first static contact 21, and the circuit protection switch is in a connected state.

As shown in fig. 7, when the kink portion 421 of the link 42 is located at the fourth inflection point 411d, the bimetal 22 is separated from the first stationary contact 21. When the circuit needs to be manually cut off, the button 30 is pressed to move the bending portion 421 of the connecting rod 42 from the third inflection point 411c to the fourth inflection point 411d so as to drive the shifting piece 43 to move, so that the bimetal piece 22 is separated from the first static contact piece 21, and the circuit is cut off. When the button 30 is released, the bending portion 421 of the link 42 moves to the first inflection point 411a, and the circuit breaker returns to the state shown in fig. 4.

Fig. 8 is a schematic structural diagram of a circuit protection switch according to an embodiment of the present disclosure. At least the second housing 12 is omitted in fig. 8. As shown in fig. 8, the paddle 43 includes a toggle portion 431 and a main body portion 432. The toggle part 431 is connected to the main body part 432 and the bimetal 22, respectively. The main body portion 432 is opposite to and connected to the top surface of the bump 41, the main body portion 432 has an opening 432a matching with the track slot 411, and the opening 432a is sleeved outside the bending portion 421. The inner wall of the opening 432a is engaged with the bending portion 421 to drive the shifting piece 43 to rotate.

During the process of pressing the button 30, the button 30 drives the link 42 to move the kink portion 421 in the track slot 411. In the moving process of the bending portion 421, the bending portion contacts with the inner wall of the opening 432a, and the shifting piece 43 is shifted by the inner wall of the opening 432a, so that the shifting piece 43 rotates, and the bimetal 22 is driven to move.

The connection portion of the pulling portion 43 and the protrusion 41 is located on a side of the third inflection point 411c close to the bimetal 22 and between the second inflection point 411b and the fourth inflection point 411 d. During the pressing of the button 30, the kink portion 421 enables the dial 43 to rotate in a first direction when pushing the dial 43 from a side near the second inflection point 411b, and the kink portion 421 enables the dial 43 to rotate in an opposite second direction when pushing the dial 43 from a side near the fourth inflection point 411 d.

As shown in fig. 8, the rotation axis m of the main body 432 is located on the side of the track slot 411 and the opening 432a close to the bimetal 22.

Illustratively, the body portion 432 and the bump 41 are connected by a pin 433. The pin 433 is located at a side of the track groove 411 and the opening 432a close to the bimetal strip 22.

The inner wall of the opening 432a has a tapered projection 4321 near the rotation axis m, and the tapered projection 4321 has a first guide sidewall 4321a and a second guide sidewall 4321 b. Wherein the first guide sidewall 4321a is adjacent to the second inflection point 411b, and the second guide sidewall 4321b is adjacent to the fourth inflection point 411 d. The first and second guide sidewalls 4321a and 4321b serve to guide a movement direction of the kink portion 421 of the link 42.

Fig. 9 and 10 are schematic diagrams of states of a circuit protection switch provided in an embodiment of the present disclosure. Fig. 8 to 10 show a process in which the bimetal 22 is reset when the circuit protection switch is turned on due to overload of the circuit. In fig. 8, when the push button 30 is pressed, the bimetal 22 contacts the first stationary contact 21, and the circuit protection switch is turned on. As shown in fig. 9, when the bimetal 22 is deformed due to an excessive load in the circuit, the bimetal 22 is separated from the first stationary contact 21, and the circuit protection switch is turned off to break the circuit. The button 30 is still in a depressed state. In order to turn on the circuit protection switch again, the bimetal 22 needs to be reset, and fig. 10 shows a rough movement trace of the bending portion 421 when the bimetal 22 is reset. As shown in fig. 10, when the button 30 is pressed, the bent portion 421 of the link 42 pushes the toggle piece 43 to rotate along the first direction, so as to drive the bimetal 22, and the bimetal 22 contacts with the first static contact 21 again, so that the circuit protection switch is turned on. After releasing the button 30, the button 30 returns to the depressed state (as shown in fig. 8).

The position of the intersection line of the first guide sidewall 4321a and the second guide sidewall 4321b with respect to the boundary surface n (see fig. 8) is different, and the guide sidewall acting on the bent portion 421 is also different during the pressing of the push button 30, so that the dial 43 can be rotated in different directions. The boundary surface n here refers to the plane on which the rotation axis m and the third inflection point 411c lie.

In the embodiment of the disclosure, when the intersection line of the first guiding sidewall 4321a and the second guiding sidewall 4321b is located on the side of the dividing plane n close to the fourth inflection point 411d, and the button 30 is pressed in the pressed state, the shift piece 43 rotates in the first direction, so that the shift piece 43 drives the bimetal 22 to contact with the first static contact 21. When the button 30 is pressed while the intersection of the first guiding sidewall 4321a and the second guiding sidewall 4321b is located at the side of the dividing plane n close to the second inflection point 411b, the striking plate 43 rotates in the second direction, so that the striking plate 43 drives the bimetal 22 to separate from the first static contact 21.

As shown in fig. 8 and 9, when the kink portion 421 of the connecting rod 42 is located at the third inflection point 411c and the bimetal 22 is separated from the first static contact piece 21, an intersection line of the first guide sidewall 4321a and the second guide sidewall 4321b is located on a side of the dividing plane n close to the fourth inflection point 411d, and the first guide sidewall 4321a is located between the kink portion 421 and the rotation axis m. When the bimetal 22 contacts the first static contact piece 21, an intersection line of the first guide side wall 4321a and the second guide side wall 4321b is located on a side of the dividing surface close to the second inflection point 411b, and the second guide side wall 4321b is located between the bending portion 421 and the rotation axis m.

Referring to fig. 9 and 10, pressing the button 30 at the kink 421 at the third inflection point 411c moves the kink 421 of the link 42 into contact with the tapered protrusion 4321. Since the first guide sidewall 4321a is located between the kink portion 421 and the rotation axis m at this time, the kink portion 421 moves to contact with the first guide sidewall 4321a after leaving the third inflection point 411 c. The first guide sidewall 4321a is close to the second inflection point 411b, and the bending portion 421 moves to the second inflection point 411b along the first guide sidewall 4321a under the action of the first guide sidewall 4321 a. And the pulling plate 43 is pushed by the bending portion 421 to rotate towards the first direction, so that the bimetal 22 contacts with the first static contact 21, and the resetting of the bimetal 22 is completed. When the external force for pressing the button 30 is removed, the kink portion 421 returns to the third inflection point 411c to keep the button 30 in the pressed state, and the state of the circuit protection switch can be referred to fig. 8.

In the case where the circuit is not overloaded, referring to fig. 8, the kink portion 421 is located at the third inflection point 411c, the bimetal 22 is in contact with the first stationary contact piece 21, the second guide sidewall 4321b is located between the kink portion 421 and the rotation axis m, and when the push button 30 is pressed, the kink portion 421 moves to be in contact with the second guide sidewall 4321b after being separated from the third inflection point 411 c. The second guide sidewall 4321b is close to the fourth inflection point 411d, and the bending portion 421 moves to the fourth inflection point 411d along the second guide sidewall 4321b under the action of the second guide sidewall 4321 b. And the toggle piece 43 is pushed by the bending portion 421 to rotate in the second direction, so that the bimetal 22 is separated from the first static contact piece 21, thereby actively breaking the circuit, and at this time, the state of the circuit protection switch can refer to fig. 7. When the external force for pressing the button 30 is removed, the kink portion 421 moves to the first inflection point 411a, so that the button 30 is maintained in the sprung state. When the bent portion 421 contacts the side wall of the opening 422a on the side away from the rotation axis m at the first inflection point 411a, the toggle piece 43 is held in this state, and the bimetal 22 is separated from the first static contact piece 21, and the state of the circuit protection switch can be referred to fig. 4.

The shape of the opening 422a can be obtained by simulation or the like, so that when the button 30 is pressed, the bending portion 421 of the connecting rod 42 can drive the pulling piece 43 to rotate, thereby controlling the bimetal strip 22.

As shown in fig. 8, an end of the toggle part 431 away from the main body part 432 is provided with a bayonet 431 a. The bayonet 431a is engaged with the bimetal 22.

Referring to fig. 2, the base 10 has a catching groove 11a, and one end of the bimetal 22 is caught in the catching groove 11a to fix the bimetal 22. The bayonet 431a of the toggle part 431 is in clamping connection with the other end of the bimetallic strip 22, and when the toggle piece 43 rotates, the toggle part 431 drives the bimetallic strip 22 to move through the bayonet 431 a.

Fig. 11 is a schematic structural diagram of a bimetal provided in an embodiment of the present disclosure. As shown in fig. 11, the middle portion of the bimetal 22 has a pre-deformation region 222, when the bimetal 22 contacts the first static contact 21, the pre-deformation region 222 protrudes to a side away from the first static contact 21, and at this time, the protruding pre-deformation region 222 can generate a certain stress, so that the bimetal 22 has a tendency to bend toward the side where the first static contact 21 is located, and the bimetal 22 is urged to keep contact with the first static contact 21. When the bimetal strip 22 is separated from the first static contact 21, the pre-deformation region protrudes to one side close to the first static contact 21, and at the moment, the protruding pre-deformation region 222 can generate certain stress, so that the bimetal strip 22 has a tendency of bending to one side away from the first static contact 21, and the bimetal strip 22 is enabled to be separated from the first static contact 21.

Illustratively, the pre-deformation region 222 may be formed by stamping.

Referring to fig. 2, the circuit protection switch further includes a support plate 25. As shown in fig. 3, the supporting plate 25 is located on the side of the bimetal 22 close to the first static contact 21 and corresponds to the pre-deformation region 222. The support plate 25 is connected to the base 10. When the bimetal 22 is in contact with the first static contact 21, a gap is formed between the support plate 25 and the predeformed area 222. When the bimetal 22 is separated from the first static contact 21, in the process of pressing the button 30 to make the bimetal 22 approach the first static contact 21, the pre-deformation region 222 is firstly protruded to the side where the first static contact 21 is located, and the pre-deformation region 222 gradually approaches the support plate 25. After the pre-deformation area 222 is contacted with the supporting plate 25, the bimetal 22 continues to approach the first static contact piece 21, the pre-deformation area 222 is gradually deformed under the support of the supporting plate 25, and after the critical position is exceeded, the deformation direction of the pre-deformation area 222 is changed to be convex towards one side far away from the first static contact piece 21.

Referring to fig. 2, the button 30 includes a key cap 31 and a light emitting structure 32. The light emitting structure 32 is located on a side of the key cap 31 adjacent the heart-shaped groove mechanism 40. The light emitting structure 32 can emit light after being energized, so that the state of the circuit can be indicated by the light emitting structure 32.

The conductive sheet assembly 20 further includes a second stationary contact 24, and the second stationary contact 24 is connected to the base 10. The second stationary contact 24 partially protrudes with respect to the base 10 to facilitate connection of the electric wires. For example, the second stationary contact 24 may be connected to neutral.

The circuit protection switch further comprises a first resilient conductive member 51 and a second resilient conductive member 52. A first resilient conductive member 51 is positioned between the bimetal 22 and the button 30, the first resilient conductive member 51 being connected to the bimetal 22 and the light emitting structure 32, respectively. A second resilient conductive member 52 is positioned between the second stationary contact 24 and the button 30, the second resilient conductive member 52 being connected to the second stationary contact 24 and the light emitting structure 32, respectively.

When the circuit protection switch is connected to the circuit, the first static contact 21 is connected to the live wire, and the second static contact 24 is connected to the neutral wire. By providing the light emitting structure 32, the first elastic conductive member 51 and the second elastic conductive member 52 connect the light emitting structure 32 to the circuit, when the bimetal 22 contacts the first static contact 21 and the circuit is switched on, the current flows through the light emitting structure 32 through the first elastic conductive member 51 and the second elastic conductive member 52, so that the light emitting structure 32 emits light to indicate the state of the circuit, and the user can know the state of the circuit protection switch conveniently. In addition, the first and second elastic conductive members 51 and 52 can also provide a force to make the button 30 bounce.

As shown in fig. 3, a first resilient conductive member 51 and a second resilient conductive member 52 are located on opposite sides of the heart-shaped slot mechanism 40.

The first elastic conductive member 51 and the second elastic conductive member 52 are disposed at both sides of the heart-shaped groove mechanism 40, so that the connection portion of the heart-shaped groove mechanism 40 and the push button 30 is located between the first elastic conductive member 51 and the second elastic conductive member 52, and thus the acting force of the connecting rod 42 on the push button 30 and the acting force of the first elastic conductive member 51 and the second elastic conductive member 52 on the push button 30 are more easily balanced, and the push button 30 is more stable. And the first elastic conductive member 51 and the second elastic conductive member 52 are separated by the heart-shaped groove mechanism 40, so that the first elastic conductive member 51 and the second elastic conductive member 52 are far away from each other, the safety can be improved, and the risk of short circuit of the first elastic conductive member 51 and the second elastic conductive member 52 can be reduced.

Illustratively, the first and second resilient conductive members 51, 52 are both electrically conductive springs. Such as a metal spring.

As shown in fig. 3, the inner wall of the first casing 11 may have a plurality of limiting plates 111, and the limiting plates 111 are located at the sides of the first elastic conductive member 51 or the second elastic conductive member 52 to limit the first elastic conductive member 51 or the second elastic conductive member 52 laterally, so as to prevent the first elastic conductive member 51 and the second elastic conductive member 52 from bending laterally.

Fig. 12 is an exploded schematic view of a button according to an embodiment of the present disclosure. As shown in fig. 12, the light emitting structure 32 includes a circuit board 321 and a light emitting device 322, the circuit board 321 is located on one side of the key cap 31 close to the heart-shaped groove mechanism 40. The light emitting device 322 is located on a side of the circuit board 321 near the key cap 31.

The light emitting device 322 is integrated on the circuit board 321 and directly disposed in the button 30, which is beneficial to reducing the volume of the circuit protection switch. Illustratively, the light emitting device 322 may be a light emitting diode.

As shown in fig. 12, the button 30 further includes a key cap seat 34, and the key cap seat 34 is connected to the key cap 31. The keycap base 34 has a stopper protrusion 341 thereon. The circuit board 321 further has a limiting hole 321 a. The limiting protrusion 341 is located in the limiting hole 321a, and the limiting protrusion 341 is matched with the limiting hole 321a to limit the circuit board 321, so that the circuit board 321 can be more stably connected with the keycap 31.

A first and a second elastic conductive member 51, 52 are connected to a side of the circuit board 321 remote from the key cap 31.

As shown in fig. 12, a first conductive pattern 3211 and a second conductive pattern 3212 are formed on a surface of the circuit board 321 away from the light emitting device 322, i.e., a surface close to the first elastic conductive member 51 and the second elastic conductive member 52. The first conductive pattern 3211 and the second conductive pattern 3212 are exposed conductive structures on the surface of the circuit board 321, such as metal sheets. The first and second conductive patterns 3211 and 3212 are connected to the light emitting devices 322 on the circuit board 321.

Illustratively, the first conductive pattern 3211 and the second conductive pattern 3212 are each rectangular.

The first elastic conductive member 51 is electrically contacted with the first conductive pattern 3211, and the second elastic conductive member 52 is electrically contacted with the second conductive pattern 3212. The first and second elastic conductive members 51 and 52 can maintain the electrical connection of the circuit board 321 with the conductive sheet assembly 20. When the moving contact 221 contacts with the fixed contact 211, the circuit is switched on, and the first elastic conductive member 51 and the second elastic conductive member 52 connect the circuit board 321 into the circuit, so that the light emitting device 322 on the circuit board 321 is electrified to emit light.

As shown in fig. 12, the button 30 further includes a light guide 33. The key cap 31 has a light hole 31a, and the light hole 31a can be seen in fig. 2. The light guide 33 is located in the light transmission hole 31a, and the light guide 33 is opposite to the light emitting device 322.

The light emitted from the light emitting device 322 is irradiated to the light guide 33, so that the light guide 33 is illuminated, and the light is emitted outward from the light transmission hole 31 a. The light guide part 33 is arranged to enable the light emitted by the light emitting structure 32 to be more uniform and softer, and prevent the light emitted by the light emitting device 322 from being too concentrated and dazzling.

In other examples, at least a portion of the keycap 31 is made of a light-conducting material. The light emitting device 322 is opposed to the portion of the key cap 31 made of the light guide material. For example, the key cap 31 is made of light-conducting material, and when the light emitted from the light emitting device 322 is irradiated to the key cap 31, the key cap 31 will be illuminated to indicate the state of the circuit protection switch.

As shown in fig. 12, the key cap 31 includes a top wall and a side wall, and a cylindrical structure with a closed top end and an open bottom end is formed by the top wall and the side wall. The light guide 33 is located in the space enclosed by the top wall and the side walls.

The light-transmitting hole 31a is located on the top wall of the key cap 31. The number of the light-transmitting holes 31a may be one, or two or more.

The embodiment of the disclosure also provides an electrical apparatus, which includes the circuit protection switch.

The circuit protection switch is arranged in the electrical equipment, so that the circuit can be manually switched off or switched on, and can be switched off when the circuit is overloaded, and the circuit is prevented from being damaged due to overload.

By way of example, the electrical device may be, but is not limited to, an electrical outlet, a power cabinet, a charging post, an air conditioner, a television.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A circuit protection switch is characterized by comprising a base (10), a conducting strip assembly (20), a button (30), a heart-shaped groove mechanism (40) and a shifting piece (43);

the conducting strip assembly (20) comprises a first static contact piece (21) and a bimetallic strip (22), the first static contact piece (21) is connected with the base (10), one end of the bimetallic strip (22) is connected with the base (10), and the other end of the bimetallic strip is opposite to the first static contact piece (21);

the button (30) is positioned on one side of the bimetallic strip (22) far away from the first static contact piece (21);

the heart-shaped groove mechanism (40) is positioned between the bimetallic strip (22) and the button (30), is connected with the button (30), and is used for locking the button (30) in a bouncing state or a pressing state;

the shifting piece (43) is connected with the heart-shaped groove mechanism (40) and the bimetallic strip (22) and is used for separating or contacting the bimetallic strip (22) and the first static contact piece (21) in the process of pressing the button (30).

2. The circuit protection switch according to claim 1, wherein the paddle (43) is configured to rotate in a first direction when the button (30) is pressed in a sprung state, bringing the bimetal (22) into contact with the first stationary contact (21);

when the button (30) is pressed in a pressed state, the bimetal (22) is rotated in the first direction to contact the first static contact piece (21), or the bimetal (22) is rotated in a second direction opposite to the first direction to separate the first static contact piece (21).

3. The circuit protection switch according to claim 2, wherein the heart-shaped slot mechanism (40) comprises a protrusion (41) and a link (42), the bottom surface of the protrusion (41) is connected to the base (10), the top surface of the protrusion has a track slot (411), one end of the link (42) has a bending portion (421), the bending portion (421) is located in the track slot (411), and the other end of the link is connected to the button (30);

the shifting piece (43) is rotatably connected with the protruding block (41), and in the process of pressing the button (30), the bending part (421) moves along the track groove (411) to drive the shifting piece (43) to rotate.

4. A circuit protection switch according to claim 3, characterized in that in said first direction said tracking slot (411) has a first inflection point (411a), a second inflection point (411b), a third inflection point (411c) and a fourth inflection point (411 d);

when the bending part (421) is located at the first inflection point (411a), the button (30) is in the bouncing state, and the bimetallic strip (22) is separated from the first static contact strip (21);

when the bending part (421) is located at the second inflection point (411b), the bimetal (22) is in contact with the first static contact piece (21);

when the bending part (421) is located at the third inflection point (411c), the button (30) is in a pressed state;

when the bending part (421) is located at the fourth inflection point (411d), the bimetal (22) is separated from the first static contact piece (21).

5. The circuit protection switch according to claim 4, wherein the connection point of the toggle piece (43) and the protrusion (41) is located on the side of the third inflection point (411c) close to the bimetal (22) and between the second inflection point (411b) and the fourth inflection point (411 d).

6. The circuit protection switch according to claim 5, wherein the toggle member (43) comprises a toggle portion (431) and a main body portion (432), the toggle portion (431) is connected to the main body portion (432) and the bimetal (22), respectively, the main body portion (432) is opposite to and connected to the top surface of the protrusion (41), the main body portion (432) has an opening (432a) matched with the track groove (411), and the opening (432a) is sleeved outside the bending portion (421).

7. The circuit protection switch according to claim 6, wherein the rotation axis (m) of the main body portion (432) is located on a side of the track groove (411) and the opening (432a) close to the bimetal (22);

the inner wall of the opening (432a) has a tapered projection (4321) near the rotation axis (m), the tapered projection (4321) has a first guide side wall (4321a) and a second guide side wall (4321b),

when the button (30) is pressed down when the intersection line of the first guide side wall (4321a) and the second guide side wall (4321b) is located on one side of a dividing plane (n) close to the fourth inflection point (411d), the poke sheet (43) rotates along the first direction, and the dividing plane (n) is a plane on which the rotation axis (m) and the third inflection point (411c) are located; when the intersection line of the first guide side wall (4321a) and the second guide side wall (4321b) is positioned on the side of the dividing plane (n) close to the second inflection point (411b), and the button (30) is pressed in a pressed state, the poking piece (43) rotates along the second direction.

8. The circuit protection switch according to claim 6, wherein an end of the toggle portion (431) away from the main body portion (432) has a bayonet (431a), and the bayonet (431a) is engaged with the bimetal (22).

9. A circuit protection switch according to any of claims 1 to 8, wherein said push button (30) comprises a key cap (31) and a light emitting structure (32), said light emitting structure (32) being located on a side of said key cap (31) adjacent to said heart-shaped channel means (40), said conductive sheet assembly (20) further comprising a second static contact (24), said second static contact (24) being connected to said base (10), said circuit protection switch further comprising a first resilient conductive member (51) and a second resilient conductive member (52), said first resilient conductive member (51) being located between said bimetal (22) and said push button (30) and being connected to said bimetal (22) and said light emitting structure (32), respectively, said second resilient conductive member (52) being located between said second static contact (24) and said push button (30), are connected to the second static contact (24) and the light emitting structure (32), respectively.

10. An electrical apparatus comprising a circuit protection switch according to any one of claims 1 to 9.

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