Switching device

Abstract

The invention relates to a switching device which comprises a tripping execution unit, the tripping execution unit comprises an elastic lever mechanism and a limiting hasp, the limiting hasp can be relatively close to or far away from the elastic lever mechanism, and the limiting hasp is in lap joint with the elastic lever mechanism and keeps the elastic lever mechanism in a state of accumulating elastic potential energy when the limiting hasp is relatively close to the elastic lever mechanism. The tripping execution unit further comprises an ejector rod, and the ejector rod is used for being pushed by the elastic lever mechanism to be ejected out of the tripping execution unit and triggering the tripping mechanism. According to the invention, the small movement stroke of the limiting hasp can trigger the large movement stroke of the lever swing mechanism, and even if the current flowing through the electromagnetic driving mechanism for driving the limiting hasp is small and the electromagnetic force is weak, the tripping triggering action with high speed, high sensitivity and large force can be realized by means of the elastic releasing process of the elastic lever mechanism.

Description

Technical Field

[0001] The present invention relates to the field of switching electrical appliances, and particularly to a trip execution unit applied to switching electrical appliances. Background Art

[0002] With the popularization of electrical equipment, people have gradually increased opportunities to contact related equipment, and power safety has received increasing attention. In order to effectively prevent the harm of residual current to people and equipment, residual current devices (RCDs) are widely used in important occasions. The RCD has the characteristic of residual current protection action and is independent of the power supply voltage. There is a type of electromagnetic RCD among residual current devices. Generally, when the residual current does not exceed 100 mA, the electromagnetic RCD can be tripped to disconnect the circuit, and it does not require an auxiliary power supply. The electromagnetic RCD uses a current transformer to convert the residual current to the secondary side, and the output of the secondary side is used to drive the electromagnetic trip execution unit, which then pushes the RCD to trip and disconnect the circuit. In the case of no auxiliary power supply, since the residual current input to the current transformer is very small, the secondary side current is very small, and the driving power given to the electromagnetic trip execution unit is very low. Therefore, the electromagnetic trip execution unit is required to be very sensitive.

[0003] The existing electromagnetic trip execution unit includes a yoke, an armature, a push rod, a tension spring, a coil, and a permanent magnet. The armature can rotate on a fulcrum to push the push rod upward. When the electromagnetic trip execution unit is not working, the magnetic flux of the permanent magnet is divided into two parts. One part of the magnetic flux flows through the "permanent magnet short-circuit loop", and the other part flows through the "permanent magnet working loop". The magnetic attraction force of the permanent magnet generated by this part of the magnetic flux is greater than the tension spring force, so that the armature remains in contact with the yoke. When the trip device operates, the coil generates magnetic flux to reduce the magnetic flux of the permanent magnet in the "permanent magnet working loop". When the magnetic attraction force received by the armature is reduced to less than the tension spring force, the armature can move upward. The existing electromagnetic trip execution unit needs to provide a relatively large tripping force (the pushing force of the push rod, usually in the range of 0.2 N to 5 N). However, the coil can only input very little energy (usually in the microvolt-ampere level, about 20 μVA to 1000 μVA). Therefore, the above-mentioned magnetic holding technology is adopted to reduce the coil energy by using magnetic difference. However, there are two problems with the electromagnetic trip execution unit using this magnetic holding technology. The first problem is that the permanent magnet is easily affected by an external magnetic field, resulting in a change in magnetic properties, thereby deteriorating the performance of the trip device. The second problem is that the electromagnetic trip execution unit has poor shock resistance when not working, because the force that keeps the armature in contact with the yoke mainly comes from the difference between the magnetic attraction force of the permanent magnet and the tension spring force, and this force cannot be too large, otherwise the coil also needs to increase the input power. Summary of the Invention

[0004] Therefore, in view of the above problems, the present invention proposes a switching device with a tripping execution unit based on a tripping execution unit with optimized structure.

[0005] The present invention is implemented by the following technical solutions:

[0006] The present invention proposes a switching device, including a tripping mechanism and a tripping execution unit for triggering the tripping mechanism. The tripping execution unit includes an elastic lever mechanism and a limit block. During the swinging stroke of the lever of the elastic lever mechanism, it respectively includes a first stroke for accumulating elastic potential energy and a second stroke for releasing elastic potential energy. The limit block can move relatively closer to or away from the elastic lever mechanism. By the limit block moving relatively closer to the elastic lever mechanism to overlap and limit the elastic lever mechanism and keep it in the state of accumulating elastic potential energy, or by the limit block moving relatively away from the elastic lever mechanism to release the elastic lever mechanism. The tripping execution unit further includes a push rod, which is slidably arranged on the movement path of the second stroke of the elastic lever mechanism and is used to be pushed by the elastic lever mechanism to eject out of the tripping execution unit and trigger the tripping mechanism.

[0007] In one embodiment, preferably, the elastic lever mechanism includes a rotating rod and an elastic member. One end of the elastic member acts on the rotating arm of the rotating rod, and the other end is fixed at a fixed point.

[0008] In one embodiment, preferably, the tripping execution unit further includes a driver for driving the limit block to move relatively closer to or away from the elastic lever mechanism.

[0009] In one embodiment, preferably, the driver is a linear motion driving device or a rotational driving device.

[0010] In one embodiment, preferably, the tripping execution unit further includes an elastic reset member, which acts on the limit block and is used to realize the reset of the limit block moving closer to the elastic lever mechanism after moving away from the elastic lever mechanism.

[0011] In one embodiment, preferably, the limit block is provided with an inclined guiding surface, which is used to abut against the rotating arm of the elastic lever mechanism on the first stroke, so that the rotating arm can cross the inclined guiding surface.

[0012] In one embodiment, preferably, the elastic reset member is a tension spring, a compression spring, a torsion spring or a spring strip.

[0013] In one embodiment, preferably, the moving plane where the limit block is located is parallel to or coincides with the moving plane where the elastic lever mechanism is located.

[0014] In one embodiment, preferably, the activity plane where the limit block is located intersects with the activity plane where the elastic lever mechanism is located.

[0015] In one embodiment, preferably, the switch is a low-voltage switch.

[0016] The present invention has the following beneficial effects: the present invention can lock and release the elastic lever mechanism through the limit block, so that the small movement stroke of the limit block can trigger the large movement stroke of the rotating rod, and the limit block only needs to move a short distance to immediately trigger the rapid ejection of the rotating rod and the push rod. Therefore, even if the current flowing through the electromagnetic drive mechanism that drives the limit block is small and the electromagnetic force is weak, a fast, high-sensitivity, and high-force tripping triggering action can be achieved with the help of the elastic release process of the elastic lever mechanism. The present invention adopts a mechanical triggering structure. When the elastic lever mechanism is in a state of being locked by the limit block, even if there is a large external impact, the elastic lever mechanism will not be released. Therefore, the tripping execution unit has strong anti-vibration and anti-impact capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the switch electrical device in Example 1;

[0018] Figure 2 is a schematic diagram of the tripping execution unit in Example 1 (first, the elastic lever mechanism is restricted in the energy storage state by the limit block);

[0019] Figure 3 is a schematic diagram of the tripping execution unit in Example 1 (second, the limit block releases the elastic lever mechanism);

[0020] Figure 4 is a schematic diagram of a tripping execution unit of a switching device in Example 2;

[0021] Figure 5 It is a schematic diagram of the tripping execution unit of the switching electrical appliance in Example 3. DETAILED DESCRIPTION

[0022] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0024] Embodiment 1:

[0025] Refer to Figure 1 As shown, as a preferred embodiment of the present invention, a switching electrical apparatus is provided, more specifically a low-voltage circuit breaker, which includes a tripping mechanism 200 and a tripping execution unit 100 for triggering the tripping mechanism 200. The tripping execution unit 100 includes a housing and an elastic lever mechanism disposed within the housing. For example Figure 2 、 3 , the elastic lever mechanism specifically includes a rotating rod 1 and an elastic member 3. In this embodiment, the housing of the tripping execution unit 100 serves as a support. The rotating rod 1 is rotatably connected within the housing and can swing about its fulcrum in a first direction T1 and a second direction T2, and the first direction T1 and the second direction T2 are opposite to each other. The elastic member 3 is a tension spring in this embodiment. One end of the elastic member 3 acts on the rotating arm of the rotating rod 1, and the other end is fixed at a fixed point within the housing. When the rotating rod 1 swings in the first direction T1, the elastic member 3 is stretched to store energy. Conversely, the elastic member 3 can also release energy to pull the rotating rod 1 to move in the second direction T2. Among them, the stroke of the rotating rod 1 swinging in the first direction T1 is defined as the first stroke of the elastic lever mechanism, and this first stroke can enable the elastic lever mechanism to enter a state of storing elastic potential energy. The stroke of the rotating rod 1 swinging in the second direction T2 is defined as the second stroke of the elastic lever mechanism, and the second stroke is the swinging stroke after the elastic lever mechanism releases elastic potential energy.

[0026] The tripping execution unit 100 further includes a limiting block 2. In this embodiment, the limiting block 2 is disposed within the housing, and a driver is drivingly connected to the limiting block 2. For example, the driver can be a push-pull electromagnet in this embodiment. The iron core of the push-pull electromagnet is fixedly connected to the limiting block 2, so that when the iron core moves reciprocally under the action of the electromagnetic force generated by the coil, it can drive the limiting block 2 to move reciprocally. The movement path of the limiting block 2 is set to be able to move relatively closer to or farther away from the rotating rod 1. For example Figure 2 , when the limiting block 2 moves relatively closer to the rotating rod 1, it can overlap and limit the rotating rod 1 to keep the elastic lever mechanism in a state of storing elastic potential energy. For example Figure 3 , when the limiting block 2 moves relatively farther away from the rotating rod 1, it can release the elastic lever mechanism, enabling the rotating rod 1 to quickly swing in the T2 direction.

[0027] The tripping execution unit 100 further includes a push rod 7. The push rod 7 is slidably disposed on the movement path of the second stroke of the elastic lever mechanism. In this embodiment, the push rod 7 is slidably connected to the housing of the tripping execution unit 100. When the rotating rod 1 swings in the second direction T2, the rotating rod 1 pushes the push rod 7 to slide out of the housing of the tripping execution unit 100 and triggers the tripping mechanism 200 by means of the outward ejection of the push rod 7, realizing the quick tripping of the switching electrical apparatus.

[0028] In this embodiment, by locking and releasing the elastic lever mechanism through the limiting block 2, the small movement stroke of the limiting block 2 can trigger the large movement stroke of the rotating rod 1. The limiting block 2 only needs to move a short distance to immediately trigger the rapid ejection of the rotating rod 1 and the push rod 7. Therefore, even if the current flowing through the coil of the push-pull electromagnet is small and the electromagnetic force is weak, the fast-speed, high-sensitivity, and high-force tripping trigger action can be achieved by means of the elastic release process of the elastic lever mechanism. Moreover, the present invention adopts a mechanical trigger structure. When the elastic lever mechanism is in the state locked by the limiting block 2, even if there is a large external impact, the elastic lever mechanism will not be released, and it has strong anti-vibration and anti-impact capabilities.

[0029] The limiting block 2 is mobile in this embodiment. In other embodiments, it can also be rotatable, as long as the limiting block 2 can move closer to or away from the rotating rod 1. Moreover, in other embodiments, the driver can also adopt other rotational drive devices or linear drive devices, such as motors, cylinders, other forms of electromagnetic drive structures different from push-pull electromagnets, etc.

[0030] In this embodiment, the limiting block 2 abuts against the rotating arm of the rotating rod 1 to lock and release the rotation of the rotating rod 1. In other embodiments, the limiting block 2 and the rotating rod 1 can adopt other coupling connection and cooperation structures, as long as the limiting block 2 at a locking position can form a coupling effect with the rotating rod 1 to prevent the rotating rod 1 from moving in the second direction T2. For example, in another embodiment, a magnetic attraction part is fixedly arranged on the limiting block 2, and a magnetic attraction cooperation part is fixedly arranged on the rotating rod 1. The magnetic attraction part of the limiting block 2 at the locking position forms a magnetic attraction cooperation and fixation with the magnetic attraction cooperation part of the rotating rod 1.

[0031] When the tripping mechanism 200 resets after tripping, the push rod 7 also moves and resets accordingly. In this embodiment, an elastic reset member 4 is further provided. The limiting block 2 is movably connected to the outer housing. One end of the elastic reset member 4 acts on the limiting block 2, and the other end acts on the outer housing. The elastic reset member 4 can store energy when the limiting block 2 moves relatively away from the rotating rod 1 to assist the limiting block 2 in resetting. Under the action of the elastic reset member 4, the limiting block 2 always has a tendency to move closer to the rotating rod 1. Therefore, in this embodiment, the limiting block 2 is provided with an inclined guiding surface 21, and the inclined guiding surface 21 is used to abut against the rotating arm of the rotating rod 1 that resets in the first direction T1. Under the guidance of the inclined guiding surface 21, the rotating arm of the rotating rod 1 that resets in the first direction T1 can push the limiting block 2 to move relatively away from the rotating rod 1. After the rotating arm of the rotating rod 1 passes over the inclined guiding surface 21, the elastic force of the elastic reset member 4 causes the limiting block 2 to return to the position where it locks the rotating rod 1, and the entire tripping execution unit 100 returns to the energy storage and locking state again.

[0032] The elastic member 3 and the elastic reset member 4 are compression springs in this embodiment, and they can also be tension springs in other embodiments. However, the installation positions need to be changed accordingly to achieve the same effect as this embodiment. Of course, the elastic member 3 and the elastic reset member 4 can also be replaced with other elastic member structures such as elastic sheets and torsion springs.

[0033] Embodiment 2:

[0034] Refer to Figure 4 , this embodiment provides a switching electrical apparatus, including a tripping mechanism and a tripping execution unit. This embodiment is generally similar to Embodiment 1. Among them, the rotating rod 1 in Embodiment 1 includes two rotating arms extending in opposite directions on both sides of its rotation center. The elastic member 3 and the limiting block 2 act on the two rotating arms respectively, while in this embodiment, the elastic member 3B and the limiting block 2B act on one of the rotating arms of the rotating rod 1B simultaneously, and the installation positions are adaptively changed.

[0035] Moreover, the elastic reset member 4B of the limiting block 2B in this embodiment is a clockwork spring. The driver 5 adopts an attracting electromagnetic drive mechanism, including a fixed iron core, a coil, and a yoke. An armature 8 is fixedly connected to the second movable member 2B for cooperating with the driver 5. When the coil is energized, the iron core attracts the armature 8 and the second movable member 2B to cause rotation, thereby releasing the rotating rod 1B.

[0036] Under the structure of this embodiment, the overall configuration of the tripping execution unit is more compact, which helps to reduce the volume of the tripping execution unit.

[0037] Embodiment 3:

[0038] Refer to Figure 5 , this embodiment provides a switching electrical apparatus, including a tripping mechanism and a tripping execution unit, which is generally similar to Embodiment 1. The difference is that in any of the above embodiments, the moving planes where the elastic lever mechanism is located and the limiting block are parallel or coincident. In this structure, the width space occupied by the tripping execution unit is relatively small (the width direction is Figures 2 - 4 any direction of the paper facing inwards), while in this embodiment, the limiting block 2C moves along the width direction of the tripping device, and the moving plane where the limiting block 2C is located intersects with the moving plane where the elastic lever mechanism is located. Although this setting results in a larger width volume occupied by the tripping execution unit, it can reduce the height space occupied by the tripping execution unit.

[0039] Although the present invention has been specifically shown and described in combination with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail without departing from the spirit and scope of the present invention defined by the appended claims all fall within the protection scope of the present invention.

Claims

1. A switching device, comprising a tripping mechanism and a tripping execution unit for triggering the tripping mechanism, characterized in that: The tripping execution unit includes an elastic lever mechanism and a limit block. During the swinging stroke of the lever, the elastic lever mechanism respectively includes a first stroke for accumulating elastic potential energy and a second stroke for releasing elastic potential energy. The limit block can move relatively closer to or farther away from the elastic lever mechanism. By moving relatively closer to the elastic lever mechanism, the limit block overlaps and limits the elastic lever mechanism to keep it in the state of accumulating elastic potential energy, or by moving relatively farther away from the elastic lever mechanism to release the elastic lever mechanism. The tripping execution unit further includes a push rod, which is slidably arranged on the movement path of the second stroke of the elastic lever mechanism and is used to receive the push of the elastic lever mechanism and push outwards beyond the tripping execution unit to trigger the tripping mechanism.

2. The switching device according to claim 1, characterized in that: The elastic lever mechanism includes a rotating rod and an elastic member. One end of the elastic member acts on the rotating arm of the rotating rod, and the other end is fixed at a fixed point.

3. The switching device according to claim 1, characterized in that: The tripping execution unit further includes a driver for driving the limit block to move relatively closer to or farther away from the elastic lever mechanism.

4. The switching device according to claim 3, characterized in that: The driver is a linear motion driving device or a rotational driving device.

5. The switching device according to claim 1, characterized in that: The tripping execution unit further includes an elastic reset member, which acts on the limit block and is used to realize the reset of the limit block to move closer to the elastic lever mechanism after moving away from the elastic lever mechanism.

6. The switching device according to claim 5, characterized in that: The limit block is provided with an inclined guiding surface, which is used to abut against the rotating arm of the elastic lever mechanism in the first stroke so that the rotating arm can cross the inclined guiding surface.

7. The switching device according to claim 5, characterized in that: The elastic reset member is a tension spring, a compression spring, a torsion spring or a clockwork spring.

8. The switching device according to claim 1, characterized in that: The moving plane where the limit block is located is parallel to or coincides with the moving plane where the elastic lever mechanism is located.

9. The switching device according to claim 1, characterized in that: The moving plane where the limit block is located intersects the moving plane where the elastic lever mechanism is located.

10. The switching device according to claim 1, characterized in that: The switching electrical appliance is a low-voltage switching electrical appliance.

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