CN112927981B - Opening solenoid for spring-operated mechanism - Google Patents

Abstract

The invention relates to a brake-separating electromagnet of a spring operating mechanism. The brake separating electromagnet of the spring operating mechanism comprises: an electromagnet main body, wherein a coil is arranged inside the electromagnet main body; the movable iron core is arranged in the coil in a penetrating way; the reset spring is used for driving the movable iron core to retreat so as to reset the movable iron core; the delay counterweight is fixed on the rear end face of the movable iron core and is used for increasing the moving mass of the movable iron core so as to reduce the action speed of the movable iron core; the delay counterweight is provided with a spring stop surface which is flush with the end face of the rear end of the movable iron core and is used for supporting the end part of the reset spring. The scheme can easily control the opening time of the operating mechanism.

Description

Opening solenoid for spring-operated mechanism

technical field

The invention relates to an opening electromagnet of a spring operating mechanism.

Background technique

According to the requirements of GB1984-2014, for an arc extinguishing chamber with a DC component of 50% of the rated short-circuit breaking current and a frequency of 50Hz, the opening time of the vacuum circuit breaker should generally be guaranteed to be at least 20ms or more to avoid the current The peak of the amplitude is broken and the arc reignites. If the opening time is too short, the circuit breaker is prone to breakdown when breaking the full-capacity current. When the existing circuit breaker is opened by high-voltage operation, the spring operating mechanism relies on the opening electromagnet to trigger the opening action. The opening electromagnet includes an electromagnet main body, a coil is arranged inside the electromagnet main body, and a moving iron core is pierced in the coil, which is used to reach forward under the drive of the coil to hit the opening pinch plate of the operating mechanism; the opening electromagnet It also includes a return spring, which is used to drive the moving iron core back to realize the reset of the moving iron core.

At present, the opening time of the spring operating mechanism controlled by the electromagnet is generally between 18 and 20ms, which has hidden dangers to the normal breaking of the vacuum circuit breaker. At present, there are mainly three ways to adjust the opening time of the spring operating mechanism: one is to adjust the transmission of the opening module of the spring operating mechanism; The third is to adjust the electromagnet parameters.

However, the first method is more difficult to design and requires life test verification; the second method may lead to unstable low-voltage tripping; the third method requires discussion with the electromagnet manufacturer and multiple verifications.

Contents of the invention

The purpose of the present invention is to provide an opening electromagnet of a spring operating mechanism, which can control the opening time of the operating mechanism relatively easily.

The opening electromagnet of the spring operating mechanism in the present invention adopts the following technical scheme:

Opening solenoid for spring-operated mechanism, consisting of:

The main body of the electromagnet has a coil inside;

The moving iron core is installed in the coil, and is used to extend forward under the drive of the coil to hit the opening pinch of the operating mechanism;

The return spring is used to drive the moving iron core back to realize the reset of the moving iron core;

Also includes:

Delay counterweight, fixed on the rear end face of the moving iron core, is used to increase the moving mass of the moving iron core to reduce the moving speed of the moving iron core;

A spring stop surface is arranged on the time-delay counterweight, and the spring stop surface is flush with the rear end face of the moving iron core for the end support of the return spring.

Beneficial effects: the adoption of the above-mentioned technical solution can decrease the moving speed of the moving iron core by increasing the moving mass of the moving iron core, thereby prolonging the action time. The end faces are flush, which can support the end of the return spring of the opening electromagnet, ensuring that the working length of the return spring is the same as before adding the delay counterweight, so that it is easier to control the opening time of the operating mechanism.

As a preferred technical solution:

The time-delay counterweight is provided with a sinker, and the bottom wall of the sinker is fixedly connected with the rear end face of the moving iron core;

The inner diameter of the sinker is larger than the outer diameter of the return spring, the rear end of the return spring is embedded in the sinker, and the spring stop surface is formed by the bottom wall of the sinker.

Beneficial effects: adopting the above-mentioned technical scheme can avoid excessively increasing the axial space occupation of the moving iron core after adding the time-delay counterweight, and avoid the problem of insufficient space at the opening electromagnet in the spring operating mechanism.

As a preferred technical solution:

The time-delay counterweight is provided with screw holes, and the time-delay counterweight is fixed on the rear end surface of the moving iron core by screws.

Beneficial effects: it is convenient to disassemble and assemble by adopting the above-mentioned technical scheme, and it is convenient to select a time-delay counterweight with a suitable weight.

As a preferred technical solution:

The side of the time-delay counterweight facing away from the moving iron core is provided with a counterbore for sinking the head of the screw.

Beneficial effects: the adoption of the above technical solution can further reduce the axial space occupied by the delay counterweight.

Description of drawings

Fig. 1 is a structural schematic view of Embodiment 1 of the opening electromagnet of the spring operating mechanism in the opening state;

Fig. 2 is a structural schematic diagram of the opening electromagnet in Fig. 1 when it is in the closing state;

Fig. 3 is a structural schematic diagram of the delay counterweight in Fig. 1;

The names of the components corresponding to the corresponding reference signs in the figure are: 11. Electromagnet main body; 12. Coil; 21. Moving iron core; 22. Bump block; 31. Return spring; sinking groove; 43, countersunk hole; 44, screw perforation; 51, screw.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that relative terms such as "first" and "second" that may appear in the specific embodiments of the present invention are only used to distinguish one entity or operation from another entity or operation, and No such actual relationship or order between these entities or operations is necessarily required or implied. Moreover, the terms "comprising", "comprising", or any other variation thereof, where the terms may appear, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, the possible occurrence of an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" that may appear should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

In the description of the present invention, unless otherwise clearly specified and limited, the term "has to be" that may appear should be understood in a broad sense, for example, the object of "has to be" can be a part of the body, or it can be separated from the body Arranged and connected on the body, the connection can be detachable or non-detachable. Those skilled in the art can understand the specific meanings of the above terms in the present invention through specific situations.

Below in conjunction with embodiment the present invention is described in further detail.

Embodiment 1 of the opening electromagnet of the spring operating mechanism in the present invention:

As shown in Figure 1 and Figure 2, the opening electromagnet of the spring operating mechanism is the opening electromagnet used by the spring operating mechanism in the vacuum circuit breaker, including the electromagnet main body 11, the moving iron core 21, the return spring 31 and the The time-delay counterweight 41 is transformed on the basis of the existing opening electromagnet. The specific transformation content is to remove the spring seat at the rear end of the original moving iron core 21 and replace the time-delay counterweight 41.

The structure of the electromagnet main body 11 can adopt the structure in the prior art, and a coil 12 is arranged inside, and a moving iron core 21 is pierced in the coil 12 . The front end of the moving iron core 21 passes through the electromagnet main body 11, and a collision block 22 is fixed on the passing part, which is used to extend forward under the drive of the coil 12 to hit the opening pinch of the operating mechanism, thereby realizing the locking of the operating mechanism. The opening action drives the arc extinguishing chamber to complete the opening of the circuit breaker.

As shown in Figure 3, the time-delay counterweight 41 is a disc-shaped structure, and its front side is provided with a sinking groove 42, and the rear side is provided with a countersunk hole 43, and the sinking groove 42 is used for inserting the rear end of the moving iron core 21, and the countersunk head The holes 43 allow the heads of the screws 51 to sink. The center of the sinker 42 is provided with a screw hole 44 for fixing the delay counterweight 41 on the rear end surface of the moving iron core 21 through screws 51 . Return spring 31 is the circuit breaker of the existing opening electromagnet. In order to ensure that the working length of return spring 31 is the same as that before adding delay counterweight 41, the inner diameter of sinking groove 42 is greater than the outer diameter of described returning spring 31, and sinking groove 42 The bottom wall of the groove is flush with the rear end face of the moving iron core 21, for the end of the return spring 31 to enter to provide support for the return spring 31, forming a spring stop surface, replacing the spring seat of the existing opening electromagnet.

When using the patented opening electromagnet, first determine the electromagnetic force required for the opening electromagnet to strike the opening pinch, test the opening time on the basis of the electromagnetic force, and control the opening through the delay counterweight 41 of corresponding quality Time, and increase the electromagnetic force appropriately by changing the number of 12 turns of the coil, so as to ensure the stable opening of low voltage, extend a certain opening time, such as 3-5ms, so that the opening time of the circuit breaker is guaranteed to be above 20ms . In addition, the spring stop surface is flush with the rear end surface of the moving iron core 21, which does not affect the working length of the original return spring 31, and does not significantly increase the overall length of the opening electromagnet, so as to avoid interference with the panel and leave a place for reset. The movement space of the spring 31 ensures the stroke of the opening electromagnet, and because the time-delay counterweight 41 is provided with a sinker 42, it can ensure that the time-delay block has sufficient quality. At the same time, the above structure can facilitate the transformation of the opening electromagnets with different opening performance requirements. Appropriately increasing the electromagnetic force by changing the number of turns of the coil 12 is beneficial for the opening electromagnet to meet the most basic opening requirements. Although the increase of the magnetic force will make the opening easier, but the excessive increase of the electromagnetic force will cause the 30% of the rated voltage of the opening to fail. This standard will fail and the opening time will be too short, which is not conducive to arc extinguishing. The increase in the number of turns of the coil and the use of the delay weight 41 can more easily meet the action requirements of the opening electromagnet, ensuring both the opening time and the normal opening action.

Embodiment 2 of the opening electromagnet of the spring operating mechanism in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the delay counterweight 41 is fixed on the rear end surface of the moving iron core 21 by screws 51, while in this embodiment, the delay counterweight 41 is fixed by riveting On the rear end face of the moving iron core 21. In other embodiments, after the weight of the delay counterweight 41 is determined, it can also be welded to the rear end surface of the moving iron core 21 .

Embodiment 3 of the opening electromagnet of the spring operating mechanism in the present invention:

The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the delay counterweight 41 is a disc structure, while in this embodiment, the delay counterweight includes a base plate, and the front side of the base plate forms a spring stop surface , there are protrusions uniformly distributed along the circumferential direction on the front side of the substrate. Certainly, in other embodiments, the delay counterweight 41 may also be a plate-shaped structure, and in order to ensure that the delay counterweight 41 has a set weight, the radial dimension of the delay counterweight can be increased.

The above is only a preferred embodiment of the application, and is not intended to limit the application. The scope of patent protection of the application is subject to the claims. Any equivalent structural changes made by using the description and accompanying drawings of the application, All should be included in the scope of protection of this application in the same way.

Claims (4)

1. The opening electromagnet of the spring operating mechanism, including: The main body of the electromagnet (11) is provided with a coil (12) inside; The moving iron core (21), which is installed in the coil (12), is used to extend forward under the drive of the coil (12) to hit the opening pinch of the operating mechanism; Return spring (31), used to drive the moving iron core (21) back to realize the reset of the moving iron core (21); It is characterized in that it also includes: Delay counterweight (41), fixed on the rear end surface of the moving iron core (21), used to increase the moving mass of the moving iron core (21) to reduce the action speed of the moving iron core (21); The delay counterweight (41) is provided with a spring stop surface, which is flush with the rear end face of the moving iron core (21), for the end support of the return spring (31); The number of turns of the coil (12) satisfies: based on setting the delay counterweight (41) to increase the moving mass of the moving iron core (21), the number of turns of the coil (12) is increased to increase the electromagnetic force, so as to pass The number of turns of the coil (12) cooperates with the delay counterweight (41) to ensure normal opening action and realize control of opening time. 2. The opening electromagnet according to claim 1, characterized in that, The delay counterweight (41) is provided with a sinker (42), and the bottom wall of the sinker (42) is fixedly connected to the rear end face of the moving iron core (21); The inner diameter of the sinking groove (42) is larger than the outer diameter of the return spring (31), the rear end of the returning spring (31) is embedded in the sinking groove (42), and the spring stop surface is formed by the sinking groove (42) the groove bottom wall is formed. 3. The opening electromagnet according to claim 1 or 2, characterized in that, The delay counterweight (41) is provided with screw holes (44), and the delay counterweight (41) is fixed on the rear end surface of the moving iron core (21) by screws (51). 4. The opening electromagnet according to claim 3, characterized in that, The side of the time-delay counterweight (41) facing away from the moving iron core (21) is provided with a counterbore (43) for sinking the head of the screw (51).