Switching device

Abstract

The invention relates to a switching device which comprises a tripping execution unit, the tripping execution unit comprises an elastic push rod mechanism and a limiting block, the elastic push rod mechanism comprises a first stroke for accumulating elastic potential energy and a second stroke for releasing the elastic potential energy in the sliding displacement stroke, and the limiting block can be relatively close to or away from the elastic push rod mechanism. The limiting block is relatively close to the elastic push rod mechanism to overlap and limit the elastic push rod mechanism and keep the elastic push rod mechanism in a state of accumulating elastic potential energy, or the limiting block is relatively far away from the elastic push rod mechanism to release the elastic push rod mechanism to pop out of the tripping execution unit so as to trigger the tripping mechanism. The small movement stroke of the limiting block can trigger the large movement stroke of the push rod, and even if the current flowing through the electromagnetic driving mechanism for driving the limiting block is small and the electromagnetic force is weak, high-speed, high-sensitivity and large-force release triggering action can be achieved by means of the elastic release process of the elastic push rod mechanism.

Description

Technical Field

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

[0002] With the popularization of electrical equipment, people's opportunities to contact related equipment have gradually increased, and electrical safety has received more and more 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 tripping execution unit, and the tripping execution unit then pushes the RCD to trip to disconnect the circuit. In the case of no auxiliary power supply, since the input residual current of the current transformer is very small, the secondary side current is very small, and the driving power given to the electromagnetic tripping execution unit is very low. Therefore, the electromagnetic tripping execution unit is required to be very sensitive.

[0003] The existing electromagnetic tripping 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 tripping 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 of the permanent magnet generated by this part of the magnetic flux is greater than the spring force, so that the armature remains in contact with the yoke. When the tripping execution unit 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 spring force, the armature can move upward. The existing tripping execution unit needs to provide a relatively large tripping force (the pushing force of the push rod, usually between 0.2 N and 5 N). However, the coil can only input very little energy (usually at 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 tripping execution unit adopting 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 tripping execution unit. The second problem is that the anti-shock performance is poor when the tripping execution unit is not working, because the force for the armature to remain in contact with the yoke mainly comes from the difference between the magnetic attraction force of the permanent magnet and the 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 having such a trip execution unit based on a trip execution unit with an 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 trip execution unit for triggering the tripping mechanism. The trip execution unit includes an elastic push rod mechanism and a limit block. During the sliding displacement stroke, the elastic push rod mechanism respectively includes a first stroke for accumulating elastic potential energy and a second stroke for releasing elastic potential energy. The limit block can relatively approach or move away from the elastic lever mechanism. By the limit block relatively approaching the elastic push rod mechanism, the elastic push rod mechanism is lapped and limited to keep it in the state of accumulating elastic potential energy, or by the limit block relatively moving away from the elastic push rod mechanism to release the elastic push rod mechanism and pop it out of the trip execution unit to trigger the tripping mechanism.

[0007] In one embodiment, preferably, the trip execution unit further includes a housing. The elastic push rod mechanism includes a push rod and an elastic member. The push rod is slidably connected to the housing. One end of the elastic member acts on the push rod, and the other end acts on a fixed point.

[0008] In one embodiment, preferably, the part where the push rod is slidably connected to the housing is a straight rod part; the part where the push rod is connected to the elastic member is the inner end of the straight rod part located inside the housing, or the inner end of the straight rod part located inside the housing is bent and connected with a bent rod part, and the bent rod part serves as the part where the push rod is connected to the elastic member.

[0009] In one embodiment, preferably, the elastic member is a tension spring, a compression spring, a torsion spring or a clockwork spring.

[0010] In one embodiment, preferably, a lapping part is provided on the elastic push rod mechanism for lapping with the limit block. The limit block is provided with an inclined guiding surface for abutting against the lapping part of the elastic push rod mechanism reset to the potential-accumulating state, so that the lapping part can cross the inclined guiding surface.

[0011] In one embodiment, preferably, a driver is further included for driving the limit block to realize its movement stroke.

[0012] In one embodiment, preferably, the driver is a linear motion driving device or a rotational driving device.

[0013] In one embodiment, it is preferred that an elastic reset member is further included, and the elastic reset member acts on the limit block to achieve the reset of the limit block away from the elastic push lever mechanism and then approaching the elastic push rod mechanism.

[0014] In one embodiment, preferably, the elastic reset element is a tension spring or a compression spring or a torsion spring or a spring.

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

[0016] The present invention has the following beneficial effects: the present invention can lock and release the elastic push rod mechanism through the limit block, so that the small movement stroke of the limit block can trigger the large movement stroke of the push rod, and the limit block only needs to move a short distance to immediately trigger the rapid ejection of the push rod. Therefore, even if the current flowing through the coil of the electromagnetic drive mechanism that drives the limit block is small and the electromagnetic force is weak, the elastic release process of the elastic push rod mechanism can be used to achieve a fast, high-sensitivity, and high-force tripping triggering action. On the other hand, the present embodiment adopts an elastic push rod mechanism as the ejection rod that triggers the tripping mechanism, which can reduce the number of components and make the structure of the tripping execution unit more compact. The present invention adopts a mechanical trigger structure, which has strong vibration and impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0019] Figure 3 Schematic diagram of the tripping execution unit in Example 1 (second, the limit block releases the elastic push rod mechanism);

[0020] Figure 4 is a schematic diagram of the tripping execution unit in Example 1 (third, a push-pull electromagnet is also shown);

[0021] Figure 5 It is a schematic diagram of the tripping execution unit of the switching electrical appliance in Example 2. 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 be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Embodiment 1:

[0025] Referring to Figure 1 shown, as a preferred embodiment of the present invention, a switching electrical appliance is provided, more specifically a 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 push rod mechanism disposed within the housing, such as Figure 2 , 3 . Specifically, the elastic push rod mechanism includes a push rod 1 and an elastic member 3. In this embodiment, the housing of the tripping execution unit 100 serves as a support. The push rod 1 is slidably connected to the housing, and the push rod 1 can slide 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 compression spring in this embodiment. One end of the elastic member 3 acts on the push rod 1, and the other end is fixed at a fixed point within the housing. When the push rod 1 slides in the first direction T1, the elastic member 3 is compressed to store energy, and conversely, the elastic member 3 can also release energy to push the push rod 1 to slide in the second direction T2. Wherein, the stroke of the push rod 1 sliding in the first direction T1 is defined as the first stroke of the elastic push rod mechanism, and this first stroke can enable the elastic push rod mechanism to enter a state of storing elastic potential energy. The stroke of the push rod 1 sliding in the second direction T2 is defined as the second stroke of the elastic push rod mechanism, and the second stroke is the sliding stroke after the elastic push rod mechanism releases elastic potential energy.

[0026] The tripping execution unit 100 further includes a limit block 2. In this embodiment, the limit block 2 is disposed within the housing, and a driver is drivingly connected to the limit block 2, such as Figure 4 . In this embodiment, the driver is a push-pull electromagnet 5. The iron core of the push-pull electromagnet 5 is fixedly connected to the limit block 2. Thus, when the iron core moves reciprocally under the action of the electromagnetic force generated by the coil, it can drive the limit block 2 to move reciprocally. The moving path of the limit block 2 is set to be able to move relatively closer to or farther away from the push rod 1, such as Figure 2 . A latching portion 11 is fixedly provided on the push rod 1. When the limit block 2 moves relatively closer to the push rod 1, it can latch and limit the latching portion 11 and keep the elastic push rod mechanism in a state of storing elastic potential energy, such as Figure 3 . When the limit block 2 moves relatively farther away from the push rod 1, it can release the elastic push rod mechanism, causing the push rod 1 to quickly slide out of the housing in the T2 direction, thereby triggering the tripping mechanism 200.

[0027] In this embodiment, by locking and releasing the elastic push rod mechanism through the limit block 2, the small movement stroke of the limit block 2 can trigger the large movement stroke of the push rod 1. The limit block 2 only needs to move a short distance to immediately trigger the rapid ejection of the push rod 1. Therefore, even if the current flowing through the coil of the push-pull electromagnet 5 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 push rod mechanism. On the other hand, in this embodiment, the elastic push rod mechanism is used as the ejector rod for triggering the tripping mechanism 200. Compared with the scheme of using a swing member to trigger the ejector rod, the number of components can be reduced, and the structure of the tripping execution unit 100 can be made more compact. Moreover, in this embodiment, the push rod 1 is of a straight rod structure, the part of the push rod 1 slidingly connected to the housing is a straight rod portion, and the elastic member 3 is a compression spring acting on the end of the straight rod portion of the push rod 1 located inside the housing, which is also beneficial to the structural compactness of the tripping execution unit 100. This embodiment adopts a mechanical trigger structure, which has strong anti-vibration and anti-impact capabilities.

[0028] The limit block 2 is mobile in this embodiment. In other embodiments, it can also be rotatable, as long as the limit block 2 can move close to or away from the lever swing mechanism 1. And 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.

[0029] The overlapping portion 11 is a convex structure on the push rod 1 in this embodiment. In other embodiments, it can also be replaced with a groove structure.

[0030] In this embodiment, the limit block 2 abuts against the overlapping portion 11 to lock the ejection of the push rod 1. In other embodiments, the limit block 2 and the push rod 1 can adopt other coupling connection and cooperation structures, as long as the limit block 2 at a locked position can form a coupling action with the push rod 1 to prevent the push rod 1 from moving in the second direction T2. For example, in another embodiment, a magnetic attraction portion is fixedly provided on the limit block 2, and a magnetic attraction cooperation portion is fixedly provided on the push rod 1. The magnetic attraction portion of the limit block 2 at the locked position forms a magnetic attraction cooperation and fixation with the magnetic attraction cooperation portion of the push rod 1.

[0031] When the tripping mechanism 200 resets after tripping, it also drives the push rod 1 to reset accordingly. In this embodiment, an elastic reset member 4 is further provided. The limit block 2 is movably connected to the outer housing. One end of the elastic reset member 4 acts on the limit block 2, and the other end acts on the outer housing. The elastic reset member 4 can store energy when the limit block 2 moves relatively away from the push rod 1 to assist the limit block 2 in resetting. Under the action of the elastic reset member 4, the limit block 2 always has a tendency to approach the push rod 1. Therefore, in this embodiment, the limit block 2 is provided with an inclined guiding surface 21, which is used to abut against the overlapping portion 11 of the push rod 1 resetting in the first direction T1. Under the guidance of the inclined guiding surface 21, the overlapping portion 11 resetting in the first direction T1 can push the limit block 2 to move relatively away from the push rod 1. After the overlapping portion 11 passes over the inclined guiding surface 21, the elastic force of the elastic reset member 4 causes the limit block 2 to return to the position of locking the push 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 can also be tension springs in other embodiments, but 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, torsion springs, and clockwork springs.

[0033] Embodiment 2:

[0034] As Figure 5 , this embodiment provides a switching electrical appliance, including a tripping mechanism and a tripping execution unit. This embodiment is generally similar to Embodiment 1, and shows the housing 6 as a support for better understanding. In this embodiment, the limit block 2 is rotatable, and the driver 5A adopts an attracting electromagnetic driving mechanism, including a fixed iron core, a coil, and a yoke. The limit block 2 is made of a magnetic material. When the coil is energized, the iron core attracts the limit block 2 to cause it to rotate, and then releases the limit block 2. The elastic reset member 4A is a tension spring. In this embodiment, the push rod 1A is a bent rod approximately in the shape of an "L", including a straight rod portion slidably connected to the housing 6 and a bent rod portion bent and connected to the inner end of the straight rod portion. The elastic member 3A is a tension spring acting on the bent rod portion.

[0035] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes in form and details made to the present invention 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 push rod mechanism and a limit block. During the sliding displacement stroke, the elastic push rod mechanism includes a first stroke for storing 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 push rod mechanism. By the limit block moving relatively closer to the elastic push rod mechanism, it overlaps and limits the elastic push rod mechanism to keep it in the state of storing elastic potential energy, or by the limit block moving relatively away from the elastic push rod mechanism to release the elastic push rod mechanism and pop it out of the tripping execution unit to trigger the tripping mechanism.

2. The switching device according to claim 1, characterized in that: The tripping execution unit further includes a housing. The elastic push rod mechanism includes a push rod and an elastic member. The push rod is slidably connected to the housing. One end of the elastic member acts on the push rod, and the other end acts on a fixed point.

3. The switching device according to claim 2, characterized in that: The part of the push rod slidably connected to the housing is a straight rod portion; the part of the push rod connected to the elastic member is the inner end of the straight rod portion located inside the housing, or the inner end of the straight rod portion located inside the housing is bent and connected with a bent rod portion, and the bent rod portion is used as the part of the push rod connected to the elastic member.

4. The switching device according to claim 2, characterized in that: The elastic member is a tension spring or a compression spring or a torsion spring or a clockwork spring.

5. The switching device according to claim 1, characterized in that: A lapping portion is provided on the elastic push rod mechanism for lapping with the limit block. An inclined guiding surface is provided on the limit block, and the inclined guiding surface is used to abut against the lapping portion of the elastic push rod mechanism reset to the energy storage state so that the lapping portion can cross the inclined guiding surface.

6. The switching device according to claim 1, characterized in that: It further includes a driver for driving the limit block to realize its movement stroke.

7. The switching device according to claim 6, characterized in that: The driver is a linear motion driving device or a rotational driving device.

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

9. The switching device according to claim 8, characterized in that: The elastic reset member is a tension spring or a compression spring or a torsion spring or a clockwork spring.

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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