Magnetic control mechanism switch

Abstract

The utility model relates to a magnetic control mechanism switch, and belongs to the technical field of power supply and distribution. The utility model relates to a contact pressure maintaining flexible connection mechanism, which is an integral body formed by three parts and comprises a first hardening part, a flexible part and a second hardening part which are connected in sequence, the insulating pull rod is fixedly connected with the arc extinguish chamber and the contact pressure maintaining flexible connection mechanism; wherein the first hardened part is provided with a first hole used for being fixedly connected with an arc extinguish chamber and an insulating pull rod, and the second hardened part is provided with a second hole used for allowing a fixing bolt of the insulating pull rod to penetrate through. According to the utility model, the contact is provided with the pressure maintaining flexible connection mechanism, and the electromagnetic force generated between the first hardening part and the second hardening part of the pressure maintaining flexible connection mechanism can be used for providing additional maintaining force for the contact when short circuit occurs, so that the contact is effectively prevented from being directly bounced off, and the stability and the safety of the circuit are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power supply and distribution, specifically relates to a magnetic control mechanism switch. BACKGROUND

[0002] A circuit breaker is a kind of fast switching device, which can be closed, carried and opened under normal circuit conditions, and can be closed, carried and opened under abnormal circuit conditions within a specified time. Circuit breakers can be used to distribute power, infrequently start asynchronous motors, and protect power lines and motors. When serious overload or short circuit and under-voltage faults occur, the circuit breaker can automatically cut off the circuit. The operating mechanism of the circuit breaker mainly has three types: electromagnetic mechanism, spring mechanism and permanent magnet mechanism. Their main function is to perform opening and closing operations according to standards to achieve the disconnection and connection of power circuits. In the existing medium-voltage conventional circuit breaker, the contact is easily directly popped open due to insufficient pressure under short circuit conditions, resulting in circuit interruption and equipment damage. This phenomenon not only affects the stability and reliability of the power system, but also may cause safety accidents.

[0003] The traditional contact connection mode cannot provide sufficient holding force under short circuit conditions, so that the contact is easily separated under large current impact, causing sudden interruption of the circuit. In addition, due to the arc generated when the contact is separated, the contact material is further damaged, shortening the service life of the circuit breaker. Therefore, it is necessary to develop a new magnetic control mechanism switch with contact pressure holding soft connection to ensure the stability of the contact and the continuity of the circuit under extreme conditions such as short circuit. SUMMARY

[0004] 1. Problem to be solved

[0005] In view of the problem that the existing circuit breaker simply connects the contact through an insulating pull rod, and the contact is directly popped open under short circuit conditions, which easily causes accidents, the utility model provides a magnetic control mechanism switch. Under short circuit conditions, the electromagnetic force between the conductors is used to provide additional holding force for the contact, ensuring the stability of the contact under short circuit conditions.

[0006] 2. Technical solution

[0007] To solve the above problems, the utility model adopts the following technical solution.

[0008] A magnetic control mechanism switch, comprising:

[0009] An arc extinguishing chamber;

[0010] A contact pressure holding soft connection mechanism, which is composed of three parts as a whole, including a first hardened part, a flexible part and a second hardened part connected in sequence;

[0011] The insulating pull rod is fixedly connected with the arc extinguishing chamber and the contact pressure maintaining soft connection mechanism;

[0012] The first hardening part is provided with a first hole for fixed connection with the arc extinguishing chamber and the insulating pull rod, and the second hardening part is provided with a second hole for passing a fixing bolt of the insulating pull rod.

[0013] Further, the first hardening part and the second hardening part of the contact pressure maintaining soft connection mechanism are oppositely arranged, and the distance between the first hardening part and the second hardening part is 10-30 mm.

[0014] Further, the first hole and the second hole are coaxially arranged.

[0015] Further, the diameter of the second hole is larger than that of the first hole.

[0016] Further, the magnetic control mechanism switch further comprises a driving mechanism for driving the insulating pull rod to control the arc extinguishing chamber to open and close.

[0017] Further, the driving mechanism mainly comprises a static iron core, a dynamic iron core and a driving coil.

[0018] Further, the magnetic control mechanism switch further comprises a controller for sending a long-time pulse current to the driving coil to control the static iron core and the dynamic iron core to attract each other when closing, and sending a reverse short-time pulse current to the driving coil to control the static iron core and the dynamic iron core to separate when opening.

[0019] Further, the magnetic control mechanism switch further comprises a Rogowski coil, and the controller judges a short-circuit current waveform through the Rogowski coil to predict a zero-crossing point.

[0020] Further, the magnetic control mechanism switch further comprises a pole column for accommodating the arc extinguishing chamber, the contact pressure maintaining soft connection mechanism and the insulating pull rod, and the pole column comprises a lower contact arm passing through a center hole of the Rogowski coil.

[0021] Further, the second hardening part is fixedly connected with a circuit in the lower contact arm.

[0022] 3, beneficial effects

[0023] Compared with the prior art, the magnetic control mechanism switch has the beneficial effects that:

[0024] The magnetic control mechanism switch has a pressure maintaining soft connection mechanism, and when short-circuiting, the electromagnetic force generated between the first hardening part and the second hardening part of the pressure maintaining soft connection mechanism can provide additional contact maintaining force for the contact, so that the contact is effectively prevented from directly bouncing away, and the stability and safety of the circuit are enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Fig. 1 is a structural schematic view of the magnetic control mechanism switch in the embodiment;

[0026] Figure 2 Structure diagram of the contact pressure maintaining soft connection mechanism in the embodiment.

[0027] In the figure:

[0028] 1, arc chamber; 2, contact pressure maintaining soft connection mechanism; 201, first hardened part; 202, flexible part; 203, second hardened part; 3, insulating pull rod; 4, Rogowski coil; 5, driving mechanism; 501, static core; 502, moving core; 503, driving coil; 6, controller. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model will be further described in combination with the embodiments.

[0030] The traditional contact connection method cannot provide sufficient holding force when short-circuiting, so that the contacts are easily separated under the impact of large current, causing sudden interruption of the circuit. In addition, the arc generated when the contacts are separated will further damage the contact material and shorten the service life of the circuit breaker. Therefore, it is necessary to develop a new magnetic control mechanism switch for contact pressure maintaining soft connection to ensure the stability of the contacts and the continuity of the circuit under extreme conditions such as short-circuiting. For this purpose, the embodiment provides a magnetic control switch, as shown in Figure 1 The main components include an arc chamber 1, a contact pressure maintaining soft connection mechanism 2 and an insulating pull rod 3. The insulating pull rod 3 is fixedly connected with the arc chamber 1 and the contact pressure maintaining soft connection mechanism 2. When short-circuiting, the electromagnetic force of the pressure maintaining soft connection mechanism can provide additional holding force for the contacts, thereby effectively preventing the contacts from being directly ejected and enhancing the stability and safety of the circuit.

[0031] The arc chamber 1 includes moving and static contacts, which are the core components of the switch and are used to cut off and close the current in the circuit. In the embodiment, the arc chamber 1 is designed as a device capable of withstanding high voltage and large current. In one possible embodiment, the arc chamber 1 adopts a vacuum bubble structure.

[0032] As shown in Figure 2As shown, the contact pressure retaining soft connection mechanism 2 is composed of three parts, in order, the first hardened part 201, the flexible part 202 and the second hardened part 203, which are connected in turn. The first hardened part 201 and the second hardened part 203 are oppositely arranged, and when a short circuit occurs, the first hardened part 201 and the second hardened part 203 have a large current, and a large electromagnetic repulsion force is formed between them. In the case of fixed connection between the second hardened part 203 and the pole column, the first hardened part 201 is subjected to upward electromagnetic repulsion force, thereby making the movable contact remain stable and closed, achieving the purpose of dynamic stability. Specifically, this structure design makes the contact not directly bounce off when the circuit is short-circuited, thereby improving the safety and reliability of the switch. In a possible embodiment, the first hardened part 201 and the second hardened part 203 are oppositely arranged, and the distance between them is controlled to be 10-30 mm, so as to ensure enough space for deformation during opening and closing, while maintaining the stability of the structure.

[0033] In a specific embodiment, the first hardened part 201 is provided with a first hole 204 for fixed connection with the arc extinguishing chamber 1 and the insulating pull rod 3, and the second hardened part 203 is provided with a second hole for passing the fixing bolt of the insulating pull rod 3, so as not to form an electrical conduction point other than the flexible part 202. Specifically, the first hole 204 and the second hole 205 are coaxially arranged, and the diameter of the second hole 205 is greater than that of the first hole 204, which makes the fixing bolt pass smoothly while ensuring the firmness of the connection.

[0034] In order to drive the opening and closing of the arc extinguishing chamber 1, the embodiment further includes a driving mechanism 5, which includes a static iron core 501, a moving iron core 502 and a driving coil 503, for driving the insulating pull rod 3 to control the opening and closing action of the arc extinguishing chamber 1. When the controller 6 issues a closing command, the driving coil 503 receives a long pulse current, so that the static iron core 501 and the moving iron core 502 are attracted, and the closing is completed. Conversely, when the controller 6 issues an opening command, the driving coil 503 receives a reverse short-time pulse current, so that the static iron core 501 and the moving iron core 502 are separated, and the opening is completed. In another possible embodiment, the driving mechanism 5 adopts an electromagnetic repulsion mechanism or a spring operating mechanism.

[0035] Also include including containing arc-extinguishing chamber 1, contact pressure maintaining soft connection mechanism 2 and insulating pull rod 3, the pole column includes upper contact arm and lower contact arm, the second hardened portion 203 is fixedly connected with the line in the lower contact arm, ensure that the electrical connection and mechanical stability between contact pressure maintaining soft connection mechanism 2 and pole column.And controller 6, controller 6 is the control center of switch, is responsible for sending closing and opening command.And the Rogowski coil 4, the Rogowski coil 4 is fixed at the lower contact arm of pole column, makes the lower contact arm pass through the center hole of the Rogowski coil 4, does not affect the normal operation of circuit breaker handcar, can also form a whole with circuit breaker, it is convenient for on-site use.In use, controller 6 judges short-circuit current waveform through the Rogowski coil 4, predicts zero-crossing point, realizes phase-controlled breaking, improves product electric life.

[0036] In practical application, the magnetic control mechanism switch can be installed in the medium-voltage power system for controlling and protecting the circuit.In the normal operation of the system, the electromagnetic force between the first hardened portion 201 and the second hardened portion 203 in the contact pressure maintaining soft connection mechanism 2 is small, which can be ignored, and does not affect the structural stability, when short circuit occurs, the first hardened portion 201 and the second hardened portion 203 in the contact pressure maintaining soft connection mechanism 2 will generate larger electromagnetic repulsion through larger current, so that the first hardened portion 201 is subjected to the thrust towards the moving contact, so that the moving contact can be effectively prevented from bouncing, and the moving contact can be kept stable closing, to achieve the purpose of dynamic stability.Meanwhile, the cooperation of the driving mechanism 5 and the controller 6 ensures that the switch can quickly and accurately complete the opening and closing actions, so as to protect the circuit from damage.

[0037] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements should fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A magnetically actuated mechanism switch, characterized by, The utility model relates to an arc extinguishing chamber (1) and a contact pressure maintaining soft connection mechanism (2) which is composed of three parts and is fixedly connected with the arc extinguishing chamber (1) and an insulating pull rod (3). The utility model relates to an arc extinguishing chamber (1) and a contact pressure maintaining soft connection mechanism (2) which is composed of three parts and is fixedly connected with the arc extinguishing chamber (1) and an insulating pull rod (3). The first hardened part (201) is provided with a first hole (204) for being fixedly connected with the arc extinguishing chamber (1) and the insulating pull rod (3), and the second hardened part (203) is provided with a second hole (205) for being penetrated by a fixing bolt of the insulating pull rod (3). The first hardened part (201) and the second hardened part (203) of the contact pressure maintaining soft connection mechanism (2) are oppositely arranged, and the distance between the two is 10-30 mm. The first hole (204) and the second hole (205) are coaxially arranged.

2. The magneto-mechanical on-off switch of claim 1, wherein, The diameter of the second hole (205) is larger than that of the first hole (204).

3. The magneto-mechanical on-off switch of claim 1, wherein, The utility model further comprises a driving mechanism (5) for driving the insulating pull rod (3) to control the opening and closing of the arc extinguishing chamber (1).

4. The magneto-mechanical on-off switch of claim 3, wherein, The driving mechanism (5) mainly comprises a static iron core (501), a dynamic iron core (502) and a driving coil (503).

5. The magneto-mechanical on-off switch according to any of claims 1-4, characterized in that The utility model further comprises a controller (6) for sending a long-time pulse current to the driving coil (503) to control the static iron core (501) and the dynamic iron core (502) to attract each other when closing, and sending a reverse short-time pulse current to the driving coil (503) to control the static iron core (501) and the dynamic iron core (502) to separate when opening.

6. The magneto-mechanical on-off switch of claim 5, wherein, The utility model further comprises a Rogowski coil (4) for judging the short-circuit current waveform and predicting the zero-crossing point.

7. The magneto-mechanical on-off switch of claim 6, wherein, The utility model further comprises a pole for accommodating the arc extinguishing chamber (1), the contact pressure maintaining soft connection mechanism (2) and the insulating pull rod (3), and the pole comprises a lower contact arm penetrating the center hole of the Rogowski coil (4).

8. The magneto-mechanical on-off switch of claim 7, wherein, The second hardened part (203) is fixedly connected with the circuit in the lower contact arm.

9. The magneto-mechanical on-off switch of claim 8, wherein, ​ 10. The magneto-mechanical on-off switch of claim 9, wherein, ​

Images