Permanent magnet driving mechanism for circuit breaker

Abstract

The invention relates to the technical field of electrical control, in particular to a permanent magnet driving mechanism for a circuit breaker. According to the technical scheme, the device comprises a packaging shell, a movable iron core, a control coil, a permanent magnet and an opening and closing adjusting mechanism, the control coil is fixed in the packaging shell, and the permanent magnet is fixed on the outer side of the movable iron core; the opening and closing adjusting mechanism comprises a main adjusting spring, a fine adjusting spring, a main adjusting connecting base, a fine adjusting connecting base and a fixing nut, the main adjusting connecting base and the fine adjusting connecting base are arranged at the two ends of the packaging shell respectively and are in threaded connection with the packaging shell, and the main adjusting spring and the fine adjusting spring abut against the two ends of the movable iron core respectively. The beneficial effects are that the main adjusting spring and the fine adjusting spring are used to abut against two ends of the moving iron core, and the moving iron core can be adjusted in switching-on holding force and switching-off power, so that the switching-off time can be accurately controlled, use scenes of most permanent magnet circuit breakers can be satisfied, and the switching control accuracy of the permanent magnet circuit breakers can be improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical control technology, and in particular to a permanent magnet drive mechanism for a circuit breaker. Background Art

[0002] In the circuit breaker for high-voltage opening and closing control, in order to achieve low-energy rapid triggering of the opening action, a permanent magnet drive mechanism with a permanent magnet and a control coil drive is usually used to drive and control the circuit breaker. The principle is as follows: during the closing movement, the control coil generates a closing direction magnetic field at the moment of power-on, driving the moving iron core to overcome the main adjustment spring and attract the upper package cover, and maintain the closed state to connect the contacts of the circuit breaker. When the working circuit is overcurrent, the control coil generates an opening direction magnetic field at the moment of power-on, and the moving iron core is separated from the upper package cover. Under the action of the magnetic field, the moving iron core moves in the opening direction to open the contacts of the circuit breaker, thereby achieving the purpose of opening. In actual applications, there are strict requirements for the time of opening. If the magnetic field that repels the permanent magnet is generated by the control coil alone, the problem of too long opening time is likely to occur. At present, there is a method of using an opening spring to accelerate the opening action of the moving iron core by using the elastic potential energy of the spring, thereby shortening the opening time. However, this type of structure cannot adjust the opening time according to actual needs. Summary of the invention

[0003] The object of the present invention is to provide a permanent magnet drive mechanism for a circuit breaker, and more particularly to provide a permanent magnet drive mechanism capable of accurately adjusting the opening time of a permanent magnet circuit breaker.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a permanent magnet drive mechanism for a circuit breaker, comprising an encapsulating shell, a moving iron core, a control coil, a permanent magnet and an opening and closing adjustment mechanism, wherein the moving iron core is slidably connected to the encapsulating shell through a driving connecting rod, the control coil, the permanent magnet, the moving iron core and the encapsulating shell are coaxially arranged, the control coil is fixed in the encapsulating shell, and the permanent magnet is fixed on the outside of the moving iron core; the opening and closing adjustment mechanism comprises a main adjustment spring, a fine adjustment spring, and a main adjustment connecting seat and a fine adjustment connecting seat respectively abutting against the main adjustment spring and the fine adjustment spring, the main adjustment connecting seat and the fine adjustment connecting seat are respectively arranged at two ends of the encapsulating shell and are threadedly connected to the encapsulating shell, and the main adjustment spring and the fine adjustment spring are respectively abutted against two ends of the moving iron core.

[0005] Specifically, the main adjustment spring is used to drive the moving iron core to move in the direction of opening the switch, and the fine adjustment spring is used to drive the moving iron core to move in the direction of closing the switch.

[0006] Specifically, the driving connecting rod is divided into a first connecting rod and a second connecting rod and is respectively arranged at the two ends of the moving iron core. The first connecting rod and the second connecting rod respectively pass through the two ends of the packaging shell and are both slidably connected to the packaging shell. Both ends of the moving iron core connected to the first connecting rod and the second connecting rod are provided with abutment grooves. The main adjustment spring and the fine adjustment spring are respectively mounted on the first connecting rod and the second connecting rod and abut against the abutment groove of the moving iron core.

[0007] Specifically, fixing nuts are provided at both ends of the packaging shell, and the fixing nuts at both ends of the packaging shell are respectively matched and connected with threads on the outer sides of the main adjustment connection seat and the fine adjustment connection seat.

[0008] Specifically, the main adjustment connection seat and the fine adjustment connection seat both include a threaded connection portion and a twisting portion and a spring abutment portion arranged at two ends of the threaded connection portion.

[0009] Specifically, the packaging shell includes a shell body and an upper packaging cover and a lower packaging cover arranged at two ends of the shell body. The upper packaging cover and the lower packaging cover are sealed and connected to the shell body by bolts.

[0010] Specifically, both ends of the packaging shell are provided with anti-skid grooves, and the fixing nuts at both ends of the packaging shell are provided with anti-skid parts on the side facing the packaging shell to correspond to the anti-skid grooves of the packaging shell.

[0011] The beneficial effects of the present invention are as follows: by arranging a main adjustment connection seat and a fine adjustment connection seat at both ends of the packaging shell, and using the main adjustment spring and the fine adjustment spring to abut the two ends of the moving iron core, the closing holding force and the opening power of the moving iron core can be adjusted, thereby achieving accurate control of the opening time, which can meet the use scenarios of most permanent magnet circuit breakers and improve the accuracy of electrical switch control. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 Schematic diagram of the overall internal structure of the permanent magnetic drive mechanism used for the circuit breaker when the circuit breaker is closed in the embodiment; Attached Figure 2 Schematic diagram of the overall internal structure of the permanent magnetic drive mechanism used for the circuit breaker in the embodiment when opening. DETAILED DESCRIPTION

[0013] Example 1, reference Figure 1-2A permanent magnet drive mechanism for a circuit breaker comprises an encapsulating shell 1, a moving iron core 2, a control coil 3, a permanent magnet 4 and an opening and closing adjustment mechanism, wherein the moving iron core 2 is slidably connected to the encapsulating shell 1 through a driving connecting rod 21, the control coil 3, the permanent magnet 4, the moving iron core 2 and the encapsulating shell 1 are coaxially arranged, the control coil 3 is fixed in the encapsulating shell 1, and the permanent magnet 4 is fixed on the outside of the moving iron core 2; the opening and closing adjustment mechanism comprises a main adjustment spring 51, a fine adjustment spring 52, and a main adjustment connecting seat 53 and a fine adjustment connecting seat 54 respectively abutting against the main adjustment spring 51 and the fine adjustment spring 52, the main adjustment connecting seat 53 and the fine adjustment connecting seat 54 are respectively arranged at both ends of the encapsulating shell 1 and are threadedly connected to the encapsulating shell 1, and the main adjustment spring 51 and the fine adjustment spring 52 are respectively abutted against the two ends of the moving iron core 2.

[0014] In this embodiment, the packaging shell 1 is used to encapsulate the control coil 3, the permanent magnet 4 and the moving iron core 2, wherein the control coil 3 is fixedly connected in the packaging shell 1, and the permanent magnet 4 is sleeved on the outside of the moving iron core 2 so that the moving iron core has the same magnetic field as the permanent magnet. A driving connecting rod 21 is connected to the moving iron core 2 and the driving connecting rod 21 passes through the packaging shell 1 and is driven and connected to the contacts of the external circuit breaker. When the moving iron core 2 moves, the driving connecting rod 21 can drive the contacts of the external circuit breaker to perform opening and closing actions. Among them, the main adjustment spring 51 and the fine adjustment spring 52 arranged at both ends of the packaging shell 1 are used to abut the moving iron core 2, and the compression amount of the main adjustment spring 51 and the fine adjustment spring 52 can be adjusted through the main adjustment connecting seat 53 and the fine adjustment connecting seat 54, so as to adjust the force applied to the moving iron core 2, wherein the main adjustment spring 51 and the fine adjustment spring 52 provide two elastic forces in opposite directions to the moving iron core 2, and the direction of the sum of the elastic forces applied by the main adjustment spring 51 and the fine adjustment spring 52 to the moving iron core 2 is the direction of driving the moving iron core 2 to move toward the opening direction, that is, the main adjustment spring 51 is used to drive the moving iron core 2 to move in the opening direction, and the fine adjustment spring 52 is used to drive the moving iron core 2 to move in the closing direction. Among them, the elastic coefficient of the main adjustment spring 51 is greater than the elastic coefficient of the fine-adjustment spring 52. The main adjustment spring 51 roughly adjusts the elastic force that the moving iron core 2 is subjected to when the gate is opened, and the fine-adjustment spring 52 finely adjusts the elastic force that the moving iron core 2 is subjected to when the gate is opened, thereby achieving precise adjustment of the elastic force that the moving iron core 2 is subjected to when the gate is opened, thereby achieving precise adjustment of the opening time.

[0015] Specifically, in the present embodiment, the driving connecting rod 21 is divided into a first connecting rod 211 and a second connecting rod 212 and are respectively arranged at the two ends of the moving iron core 2. The first connecting rod 211 and the second connecting rod 212 respectively pass through the two ends of the packaging shell 1 and are both slidably connected to the packaging shell 1. Both ends of the moving iron core 2 connected to the first connecting rod 211 and the second connecting rod 212 are provided with abutment grooves 22. The main adjustment spring 51 and the fine adjustment spring 52 are respectively sleeved on the first connecting rod 211 and the second connecting rod 212 and abut against the abutment grooves 22 of the moving iron core 2.

[0016] Preferably, both ends of the encapsulation shell 1 are provided with fixing nuts 6, and the fixing nuts 6 at both ends of the encapsulation shell 1 are respectively connected with the threads on the outside of the main adjustment connection seat 53 and the fine adjustment connection seat 54. The main adjustment connection seat 53 and the fine adjustment connection seat 54 can be fixed by the fixing nuts 6 to prevent the main adjustment connection seat 53 and the fine adjustment connection seat 54 from loosening during the opening and closing process to affect the opening time.

[0017] Specifically, the main adjustment connection seat 53 and the fine adjustment connection seat 54 both include a threaded connection portion 55 and a twisting portion 56 and a spring abutment portion 57 arranged at both ends of the threaded connection portion 55, wherein the twisting portion 56 is fixedly connected to the threaded connection portion 55, and the spring abutment portion 57 is connected to the threaded connection portion 55 through a threaded structure; the packaging shell 1 includes a shell body 11 and an upper packaging cover 12 and a lower packaging cover 13 arranged at both ends of the shell body 11, and the upper packaging cover 12 and the lower packaging cover 13 are sealed and connected to the shell body 11 by bolts. When assembling the permanent magnet drive mechanism of this embodiment, first screw the threaded connection part 55 of the main adjustment connection seat 53 into the fixing nut 6 and the upper packaging cover 12, screw the threaded connection part 55 of the fine-adjustment connection seat 54 into the fixing nut 6 and the lower packaging cover 13, and then thread the spring abutment part 57 at the end of the threaded connection part 55, and then fix the control coil 3 in the shell body 11, and install the moving iron core 2, the main adjustment spring 51 and the fine-adjustment spring 52, and finally seal the upper packaging cover 12 and the lower packaging cover 13 connected with the main adjustment connection seat 53 and the fine-adjustment connection seat 54 at both ends of the shell body 11 through bolts, so as to complete the overall assembly of the permanent magnet drive mechanism, and adjust the main adjustment connection seat 53 and the fine-adjustment connection seat 54 to the appropriate position, and then tighten the fixing nut 6 to complete the adjustment.

[0018] Specifically, anti-skid grooves 13 are further provided at both ends of the encapsulation shell 1, and the fixing nuts 6 at both ends of the encapsulation shell 1 are provided with anti-skid portions on the side facing the encapsulation shell 1 to correspond to the anti-skid grooves 13 of the encapsulation shell 1. The anti-skid grooves 13 can further prevent the fixing nuts 6 from skidding, thereby improving the installation stability of the main adjustment connection seat 53 and the fine adjustment connection seat 54.

[0019] Of course, the above are only preferred embodiments of the present invention, and are not intended to limit the scope of use of the present invention. Therefore, any equivalent changes made to the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet drive mechanism for a circuit breaker, characterized in that: It includes a packaging shell, a moving iron core, a control coil, a permanent magnet and an opening and closing adjustment mechanism. The moving iron core is slidably connected to the packaging shell through a driving connecting rod. The control coil, the permanent magnet, the moving iron core and the packaging shell are coaxially arranged. The control coil is fixed in the packaging shell, and the permanent magnet is fixed on the outside of the moving iron core. The opening and closing adjustment mechanism includes a main adjustment spring, a fine adjustment spring, and a main adjustment connecting seat and a fine adjustment connecting seat respectively abutting against the main adjustment spring and the fine adjustment spring. The main adjustment connecting seat and the fine adjustment connecting seat are respectively arranged at two ends of the packaging shell and are threadedly connected to the packaging shell. The main adjustment spring and the fine adjustment spring are respectively abutted against two ends of the moving iron core.

2. A permanent magnet drive mechanism for a circuit breaker according to claim 1, characterized in that: The main adjustment spring is used to drive the moving iron core to move in the direction of opening the switch, and the fine adjustment spring is used to drive the moving iron core to move in the direction of closing the switch.

3. The permanent magnet drive mechanism for a circuit breaker according to claim 1, characterized in that: The driving connecting rod is divided into a first connecting rod and a second connecting rod and is respectively arranged at two ends of the moving iron core. The first connecting rod and the second connecting rod respectively pass through the two ends of the packaging shell and are both slidably connected to the packaging shell. Both ends of the moving iron core connected to the first connecting rod and the second connecting rod are provided with abutment grooves. The main adjustment spring and the fine adjustment spring are respectively sleeved on the first connecting rod and the second connecting rod and abut against the abutment groove of the moving iron core.

4. The permanent magnet drive mechanism for a circuit breaker according to claim 1, characterized in that: Both ends of the packaging shell are provided with fixing nuts, and the fixing nuts at both ends of the packaging shell are respectively matched and connected with threads on the outer sides of the main adjustment connection seat and the fine adjustment connection seat.

5. A permanent magnet drive mechanism for a circuit breaker according to claim 4, characterized in that: The main adjustment connection seat and the fine adjustment connection seat both include a threaded connection portion and a twisting portion and a spring abutment portion arranged at two ends of the threaded connection portion.

6. A permanent magnet drive mechanism for a circuit breaker according to claim 5, characterized in that: The packaging shell comprises a shell body and an upper packaging cover and a lower packaging cover arranged at two ends of the shell body. The upper packaging cover and the lower packaging cover are sealed and connected to the shell body by bolts.

7. The permanent magnet drive mechanism for a circuit breaker according to claim 4, characterized in that: Both ends of the packaging shell are provided with anti-skid grooves, and the fixing nuts at both ends of the packaging shell are provided with anti-skid parts on the side facing the packaging shell to correspond to the anti-skid grooves of the packaging shell.

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