CN210575770U

CN210575770U - Power-off protection switch

Info

Publication number: CN210575770U
Application number: CN201922116107.3U
Authority: CN
Inventors: 秦仁龙; 倪宗球; 李尚淳; 吴光平; 阮银生
Original assignee: Zhejiang Changlong Electric Co ltd
Current assignee: Zhejiang Changlong Electric Co ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-05-19
Anticipated expiration: 2029-11-29

Abstract

The utility model provides a power-off protection switch, a main switch comprises a normally closed switch and a normally open switch which are arranged in a linkage way and have opposite opening and closing states, the main switch is provided with an initial position and a switching position for driving the normally closed switch and the normally open switch to switch the opening and closing states; the relay is internally provided with a coil, an armature and a relay switch, when the coil is electrified, electromagnetic driving force is generated to attract the armature so as to switch on the relay switch, the relay switch is connected with the normally closed switch in parallel and is connected with the normally open switch in series, the coil is connected with the normally closed switch in series, wherein the normally closed switch and the coil can form a first electrifying loop, and the relay switch, the normally open switch and the load can form a second electrifying loop. When power is suddenly cut off and power is supplied again, the normally closed switch and the relay switch are both in a power-off state, the coil is still in a power-off state, and the second power-on loop where the load is located is also in a power-off state, so that the false start is avoided, and the load can work only by pressing the main switch again at the moment.

Description

Power-off protection switch

Technical Field

The utility model relates to a protection switch technical field, concretely relates to power-off protection switch.

Background

The power-off protection switch is commonly used for electric tools such as electric drills, electric hammers and electric grinders, and after power failure and power re-transmission, the power-off protection switch can prevent the electric tools from being started by mistake, so that equipment and personal safety are protected. However, the existing power-off protection switch has the defects of relatively complex structure and low reliability.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the electronic type power-off protection structure among the prior art is complicated, the reliability is poor to a power-off protection switch that simple structure, reliability are high is provided.

Therefore, the utility model provides a power-off protection switch is suitable for connecting power and load, power-off protection switch includes body, main switch and relay, and main switch sets up in this body, and it has linkage setting, and normally closed switch and normally open switch that the open-close state is opposite, main switch has initial position, and the switching position of being driven by button push rod subassembly, switching the normal closed switch and the normally open switch open-close state, wherein, when in initial position, normally closed switch is in the closed state, normally open switch is in the off-state; the relay is provided with coil, armature and relay switch in it, when the coil circular telegram, produce the electromagnetic drive power actuation armature, so that the relay switch-on, the relay switch with normally closed switch connects in parallel, and with normally open switch establishes ties, the coil with normally closed switch establishes ties, wherein, normally closed switch with the coil can form first circular telegram circuit, the relay switch normally open switch with the load can form the second circular telegram circuit.

One side of the body is provided with a power input connecting piece and a power output connecting piece which are respectively connected with a power input end and an output end, and the other side of the body is provided with a load input connecting piece and a load output connecting piece which are respectively connected with a load input end and an output end.

The body is provided with a circuit board and the relay arranged on the circuit board, the top of the relay is provided with a first pin, a second pin, a third pin and a fourth pin which are matched and spliced with the circuit board, wherein the first pin and the second pin are correspondingly connected with the two ends of the coil respectively, the third pin and the fourth pin are correspondingly connected with the two ends of the relay switch respectively, and the fourth pin is electrically connected with the first pin through the circuit board.

The main switch comprises a moving contact, a normally closed moving contact and a normally open moving contact, the middle part of the moving contact is rotatably arranged on a first connecting piece, and the first connecting piece is provided with a fifth pin electrically connected with the fourth pin; the power input connecting piece is provided with a normally closed stationary contact arranged opposite to the normally closed movable contact and a sixth plug pin electrically connected with the third plug pin, and the load input connecting piece is provided with a normally open stationary contact arranged opposite to the normally open movable contact.

The power output connecting piece with load output connecting piece parallel arrangement, and both pass through the connecting plate and connect, the connecting plate set up perpendicularly in power output connecting piece's extending direction.

And the load output connecting piece is provided with a seventh pin which is electrically connected with the second pin through the circuit board.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a power-off protection switch, including main switch and relay, the main switch includes the linkage setting, and the opposite normal close switch of switching state and normally open switch, the relay, be provided with the coil in it, armature and relay switch, when the coil circular telegram, produce electromagnetic drive power actuation armature, so that the relay switch-on, the relay switch is parallelly connected with the normal close switch, and establish ties with normally open switch, the coil establishes ties with normally close switch, wherein, normally close switch and coil can form first circular telegram return circuit, the relay switch, normally open switch and load can form second circular telegram return circuit. The main switch is electrified at the initial position, a first electrified loop where the normally closed switch and the coil are located is electrified, and after the coil is electrified, electromagnetic driving force is generated to attract the armature so that the relay switch connected with the normally closed switch in parallel is in a closed state; then manually pressing the push rod assembly to move the main switch from the initial position to the switching position, wherein the normally closed switch is in an off state and the normally open switch is in a closed state when the main switch is in the switching position, and the relay switch, the normally open switch and a second current-carrying loop where a load is located are electrified to enable the load to work; when power failure occurs suddenly, the coil cannot generate electromagnetic driving force to attract the armature after power failure, the armature resets under the action of the spring, the relay switch is in an off state, after power is supplied again, the normally closed switch and the relay switch are both in the off state, the coil is still in the off state, and a second power-on loop where the load is located is also in the off state, so that false start is avoided, the main switch needs to be pressed again when the load works, the main switch is recovered to the initial position, the relay switch is driven to be closed after the coil is powered on, the main switch is driven to move to the switching position again, and the second power-on loop where the load is located is switched on. The power-off protection switch has the advantages of simple structure and high reliability.

2. The utility model provides a power-off protection switch, one side of body are equipped with the power input connecting piece and the power output connecting piece of connecting power input end and output respectively, and the opposite side is equipped with the load input connecting piece and the load output connecting piece of connecting load input end and output respectively, and the user of service is difficult for connecing wrong convenient to use like this.

3. The utility model provides a power-off protection switch, main switch includes: the middle part of the moving contact is rotatably arranged on a first connecting piece, and the first connecting piece is provided with a fifth pin electrically connected with the fourth pin; the normally closed movable contact and the normally open movable contact are respectively arranged at two ends of the movable contact, a normally closed stationary contact arranged opposite to the normally closed movable contact and a sixth plug pin electrically connected with the third plug pin are arranged on the power input connecting piece, and a normally open stationary contact arranged opposite to the normally open movable contact is arranged on the load input connecting piece. The driving moving contact rotates, so that the normally open switch and the normally closed switch of the main switch are switched to be in an on-off state.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an explosion structure diagram of the power-off protection switch of the present invention;

FIG. 2 is a first perspective view of FIG. 1 with the housing removed;

FIG. 3 is a second perspective view of FIG. 1 with the housing removed;

FIG. 4 is a third perspective view of FIG. 1 with the housing removed;

FIG. 5 is an exploded view of the circuit board and relay shown in FIG. 4 with the circuit board and relay removed;

FIG. 6 is an exploded view of the circuit board and relay;

FIG. 7 is a circuit schematic of a first power-on loop of the power down protection switch in a power-on state;

fig. 8 is a circuit schematic diagram of the second energizing circuit of the power-off protection switch in an energized state.

Description of reference numerals: 1. a power source; 110. normally closed stationary contacts; 112. a sixth pin; 11. a power input connection; 12. a power output connection; 2. a load; 21. a load input connection; 210. a normally open stationary contact; 22. a load output connection; 23. a connecting plate; 24. a seventh pin; 3. a body; 4. a main switch; 41. a normally closed switch; 410. normally closing the movable contact; 42. a normally open switch; 420. a normally open movable contact; 43. a moving contact; 5. a relay; 6. a coil; 61. a first pin; 62. a second pin; 7. a relay switch; 73. a third pin; 74. a fourth pin; 8. a circuit board; 9. a first connecting member; 91. and a fifth pin.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Examples

The present embodiment provides a power-off protection switch, as shown in fig. 1 to 6, adapted to connect a power source 1 and a load 2, a power-off protection switch pack body 3, a main switch 4, and a relay 5.

As shown in fig. 2 to 4, a power input connector 11 and a power output connector 12 respectively connected to a power input end and a power output end are disposed on one side of the body 3, a load input connector 21 and a load output connector 22 respectively connected to a load input end and a load output end are disposed on the other side of the body 3, the power output connector 12 and the load output connector 22 are disposed in parallel and connected to each other through a connecting plate 23, the connecting plate 23 is vertically disposed in an extending direction of the power output connector 12, a circuit board 8 is disposed on the top of the body 3, and a seventh pin 24 electrically connected to the second pin 62 through the circuit board 8 is disposed on the load output connector 22.

Relay 5 is provided with coil 6, armature and relay switch 7 in it, when 6 circular telegrams of coil, produce the actuation of electromagnetic drive power armature, so that relay switch 7 switches on, relay switch 7 with normally closed switch 41 is parallelly connected, and with normally open switch 42 establishes ties, coil 6 with normally closed switch 41 establishes ties, wherein, normally closed switch 41 with coil 6 can form first circular telegram, relay switch 7 normally open switch 42 with load 2 can form second circular telegram. As shown in fig. 6, a first pin 61, a second pin 62, a third pin 73 and a fourth pin 74 which are adapted to be plugged with the circuit board 8 are disposed on the top of the relay 5, wherein the first pin 61 and the second pin 62 are respectively and correspondingly connected to two ends of the coil 6, the third pin 73 and the fourth pin 74 are respectively and correspondingly connected to two ends of the relay switch 7, and the fourth pin 74 is electrically connected to the first pin 61 through the circuit board 8. In this embodiment, the relay 5 is an electromagnetic relay (it should be noted that the electromagnetic relay is a mature technology in the prior art, and therefore, the internal structure thereof is not described in detail).

The main switch 4 is arranged in the body 3, as shown in fig. 2 and 5, the main switch 4 has a normally closed switch 41 and a normally open switch 42 which are linked and have opposite opening and closing states, the main switch 4 has an initial position, and a switching position which is driven by the button push rod assembly and switches the opening and closing states of the normally closed switch 41 and the normally open switch 42, wherein, when the initial position is reached, the normally closed switch 41 is in a closed state, and the normally open switch 42 is in an open state. In this embodiment, the main switch 4 includes: the movable contact 43, the middle part of which is rotatably mounted on the first connecting piece 9, the first connecting piece 9 is provided with a fifth pin 91 electrically connected with the fourth pin 74; the normally closed moving contact 410 and the normally open moving contact 420 are respectively arranged at two ends of the moving contact 43, the power input connecting piece 11 is provided with a normally closed stationary contact 110 arranged opposite to the normally closed moving contact 410 and a sixth pin 112 electrically connected with the third pin 73, and the load input connecting piece 21 is provided with a normally open stationary contact 210 arranged opposite to the normally open moving contact 420.

The working principle of the disconnection protection switch of the embodiment is as follows:

the main switch 4 is powered on at an initial position, as shown in fig. 7, a first power-on loop where the normally closed switch 41 and the coil 6 are located is powered on (the arrow direction is the current flowing direction), and after the coil 6 is powered on, an electromagnetic driving force is generated to attract the armature, so that the relay switch 7 connected in parallel with the normally closed switch 41 is in a closed state; then, the push rod assembly is manually pressed to move the main switch 4 from the initial position to the switching position, and in the switching position, as shown in fig. 8, the normally closed switch 41 is in the open state, the normally open switch 42 is in the closed state, and the relay switch 7, the normally open switch 42 and a second current-carrying loop in which the load 2 is located are powered on (the arrow direction is the current flowing direction), so that the load 2 works; when power failure occurs suddenly, the coil 6 cannot generate electromagnetic driving force to attract the armature after power failure, the armature resets under the action of the spring, the relay switch 7 is in an off state, after power is supplied again, the normally closed switch 41 and the relay switch 7 are both in the off state, the coil 6 is still in the power failure state, and a second power-on loop where the load 2 is located is also in the off state, so that false start is avoided, the load is required to work at the moment, the main switch 4 needs to be pressed again, the main switch 4 is recovered to the initial position, the coil 6 drives the relay switch 7 to be closed after power is supplied, the main switch 4 is driven to move to the switching position again, and the second power-on loop where the load 2 is located is switched on.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A power fail safe switch adapted to connect a power source (1) and a load (2), the power fail safe switch comprising:

a body (3);

the main switch (4) is arranged in the body (3) and is provided with a normally closed switch (41) and a normally open switch (42) which are arranged in a linkage manner and have opposite opening and closing states, the main switch (4) is provided with an initial position and a switching position which is driven by a button push rod assembly and switches the opening and closing states of the normally closed switch (41) and the normally open switch (42), wherein in the initial position, the normally closed switch (41) is in a closed state, and the normally open switch (42) is in an open state;

relay (5), be provided with coil (6), armature and relay switch (7) in it, when coil (6) circular telegram, produce the electromagnetic drive power actuation armature, so that relay switch (7) switch-on, relay switch (7) with normally closed switch (41) are parallelly connected, and with normally open switch (42) are established ties, coil (6) with normally closed switch (41) are established ties, wherein, normally closed switch (41) with coil (6) can form first circular telegram return circuit, relay switch (7) normally open switch (42) with load (2) can form second circular telegram return circuit.

2. The power failure protection switch according to claim 1, wherein the body (3) is provided with a power input connector (11) and a power output connector (12) at one side thereof for connecting the power input terminal and the power output terminal, respectively, and a load input connector (21) and a load output connector (22) at the other side thereof for connecting the load input terminal and the load output terminal, respectively.

3. The power failure protection switch according to claim 2, wherein a circuit board (8) is arranged on the body (3), and the relay (5) is mounted on the circuit board (8), a first pin (61), a second pin (62), a third pin (73) and a fourth pin (74) are arranged on the top of the relay (5) and are adapted to be plugged with the circuit board (8), wherein the first pin (61) and the second pin (62) are respectively correspondingly connected with two ends of the coil (6), the third pin (73) and the fourth pin (74) are respectively correspondingly connected with two ends of the relay switch (7), and the fourth pin (74) is electrically connected with the first pin (61) through the circuit board (8).

4. The power down protection switch according to claim 3, characterized in that the main switch (4) comprises:

the middle part of the moving contact (43) is rotatably arranged on a first connecting piece (9), and the first connecting piece (9) is provided with a fifth pin (91) electrically connected with the fourth pin (74);

the normally closed movable contact (410) and the normally open movable contact (420) are respectively arranged at two ends of the movable contact (43), the power input connecting piece (11) is provided with a normally closed stationary contact (110) which is arranged opposite to the normally closed movable contact (410) and a sixth plug pin (112) which is electrically connected with the third plug pin (73), and the load input connecting piece (21) is provided with a normally open stationary contact (210) which is arranged opposite to the normally open movable contact (420).

5. The power-off protection switch according to claim 4, characterized in that the power output connector (12) and the load output connector (22) are arranged in parallel and connected by a connecting plate (23), and the connecting plate (23) is arranged vertically in the extending direction of the power output connector (12).

6. The power down protection switch according to claim 5, wherein the load output connector (22) is provided with a seventh pin (24) electrically connected to the second pin (62) through the circuit board (8).