CN116417271A - Rotary electromagnetic driving mechanism, contact switch assembly and switch electrical appliance - Google Patents

Abstract

The invention relates to a rotary electromagnetic driving mechanism, a contact switch assembly and a switch electrical appliance, wherein the rotary electromagnetic driving mechanism comprises a magnetic conduction frame, a coil and an armature, the magnetic conduction frame comprises a closed frame-shaped base body, two opposite first sections of the frame-shaped base body extend respectively to form a static attraction part, the other two opposite second sections of the frame-shaped base body are wound with the coil to magnetize the magnetic conduction frame, the armature is of a strip-shaped swing arm structure and can be rotatably arranged in the frame-shaped base body, and magnetic fluxes generated by the coils wound on the two second sections on the frame-shaped base body are converged to superimpose excitation magnetic fields on the static attraction part, and the static attraction part generates magnetic attraction force couple rotating towards the armature. The invention can effectively improve the output torque of the armature of the rotary electromagnetic mechanism through various improvements of the rotary electromagnetic mechanism, and can meet the requirements of opening and closing speeds of the switching device.

Description

Rotary electromagnetic driving mechanism, contact switch assembly and switch electrical appliance

Technical Field

The invention relates to the field of switching appliances, in particular to a contact assembly and an improvement of an execution assembly structure.

Background

In the switching occasion of the electric loop, a switching device comprising a relay, a contactor, a breaker, an isolating switch and the like is a basic electric element widely applied; it generally comprises: contact switch assembly, coupling assembling, arc extinguishing subassembly, remote signaling subassembly etc.. As a core component for realizing basic functions, the structural design of the contact switch assembly comprising the contact assembly and the execution assembly is closely related to the performance of the contact switch assembly.

Compared with the actuating assembly of the traditional direct-acting electromagnetic driving mechanism, the rotary electromagnetic driving mechanism is an electromagnetic driving mechanism with a novel structure, and mainly utilizes the electromagnetic attraction force of the protruding magnetic attraction part in the frame type electromagnet to attract the armature to rotate, so that a rotary actuating effect is generated. The rotary electromagnetic driving mechanism in the prior art is often limited by the space structure of the switching device and cannot output larger torque, so that the switching device (especially the circuit breaker) cannot meet the switching-on and switching-off speed requirement. Therefore, the rotary electromagnetic driving mechanism needs to be improved and designed, and can output larger torque to meet the requirements of opening and closing speeds of the switching device on the premise of meeting the requirements of space structure limitation, so that the rotary electromagnetic driving mechanism can break short-circuit current and has higher electrical and mechanical life.

Disclosure of Invention

Therefore, in order to solve the above problems, the invention provides a rotary electromagnetic driving mechanism with larger output torque, a contact switch assembly and a switch electrical appliance with optimized structure based on the rotary electromagnetic driving mechanism.

The invention is realized by adopting the following technical scheme:

the invention provides a rotary electromagnetic driving mechanism, which comprises a magnetic conduction frame, coils and an armature, wherein the magnetic conduction frame comprises a closed frame-shaped base body, two opposite first sections of the frame-shaped base body respectively extend to form a static attraction part, the coils are wound on two opposite second sections of the frame-shaped base body to magnetize the magnetic conduction frame, the armature is of a strip-shaped swing arm structure and can be rotatably arranged in the frame-shaped base body, magnetic fluxes generated on the frame-shaped base body by the coils wound on the two second sections are converged to superimpose excitation magnetic fields on the static attraction part, and the static attraction part generates a magnetic attraction couple for the armature to rotate towards the armature.

In one embodiment, the two static attraction units preferably respectively include a magnetic attraction surface facing the armature, and the magnetic attraction surface is an inclined surface arranged in an inclined manner.

In one embodiment, the magnetic attraction surface is an integral inclined surface extending from the first section of the frame-shaped base body to the inside of the frame body in an inclined manner, wherein the integral inclined surface is used as a starting part, so as to maximize the magnetic attraction area and ensure that the armature can be reliably attracted to the closing position.

In one embodiment, the cross section of the static attraction portion is preferably trapezoidal or triangular, so that the static attraction portion gradually contracts from the first section of the frame-shaped substrate to the inside of the frame.

Wherein, in order to enlarge the space between the two static engaging portions to enlarge the mountable space of the armature, in one embodiment, it is preferable that the static engaging portions contract in a direction deviating from the armature.

In order to enlarge the space between the two stationary engaging portions and thus enlarge the mountable space of the armature, it is preferred in one embodiment that the two stationary engaging portions are offset from one another in each case at the location of the frame-shaped base body.

Wherein, in order to maximize the length of the armature so that the armature and the whole magnetic attraction surface achieve a corresponding magnetic attraction of substantially the whole surface, the magnetic attraction area is maximized, in one embodiment, the length of the armature bar-shaped swing arm is preferably approximately equal to the distance between the two magnetic attraction surfaces at the initial portions of the first section of the frame-shaped base body.

In order to ensure the closing reliability of the armature by fitting the armature against the two magnetic attraction surfaces at an appropriate angle, in one embodiment, the magnetic attraction surfaces of the two static attraction parts are inclined planes parallel to each other, and the width of the strip-shaped swing arm of the armature is equal to the parallel interval.

In order to maximize the width of the armature, avoid the armature from interfering with the coil, and enable the coil to be wound with more turns, so as to obtain stronger electromagnetic driving force, in one embodiment, the armature is preferably in a locally missing abdication structure on the other side of the strip-shaped swing arm away from the magnetic attraction surface.

Wherein, based on the manufacturing and installation considerations, in one embodiment, the frame-shaped base body is preferably in a square frame structure, two static attraction parts extend from two parallel first sections of the frame-shaped base body, and the coil is wound on the other two parallel second sections of the frame-shaped base body.

In one embodiment, the magnetic conductive frame preferably further includes at least one group of expansion poles symmetrically expanded outwards at two second sections of the frame-shaped base body, the expansion poles are connected in parallel with the frame-shaped base body, and each expansion pole is wound with a coil so as to simultaneously superimpose the exciting magnetic field of the coil on each expansion pole on the static attraction portion.

In one embodiment, it is preferable that two opposite first sections of the frame-shaped base body extend towards the tail end of the bar-shaped swing arm of the armature respectively, and the auxiliary engaging portion is disposed adjacent to the static engaging portion.

In order to make the magnetic attraction force of the auxiliary attraction part on the armature more stable and balanced in the rotation stroke of the armature, in one embodiment, preferably, the tail end of the bar-shaped swing arm of the armature is of a convex arc-shaped convex structure, and the tail end of the bar-shaped swing arm of the auxiliary attraction part facing the armature is of a matched arc-shaped concave notch.

In order to assist in attracting the armature at the closing position, reduce the current of the coil, and reduce the power loss, in one embodiment, it is preferable that a permanent magnet is further fixedly arranged on the static attraction portion, and the permanent magnet applies permanent magnet attraction to the armature to assist the static attraction portion to attract and fix the armature.

In order to reduce the magnetic attraction of the permanent magnet to the armature during opening and prevent the false operation of the armature, in one embodiment, the permanent magnet is preferably fixedly arranged at the end of the static attraction portion.

In one embodiment, the permanent magnet preferably includes at least a magnetic pole surface coplanar with the magnetic attraction surface, and the static attraction portion is capable of being abutted against the magnetic attraction surface and the magnetic pole surface when the armature is attracted, so that the strip-shaped armature is attracted together by the magnetic attraction surface of the static attraction portion and the magnetic pole surface of the permanent magnet.

Preferably, the rotary electromagnetic drive further comprises a spring return element, which acts directly or indirectly on the armature to return the armature.

In one embodiment, the magnetic conduction frame is preferably formed by butt-jointing and fixing two semi-closed split structures.

Based on the rotary electromagnetic driving mechanism, the invention further provides a contact switch assembly, which comprises a fixed static contact part and a movable dynamic contact part, and further comprises a driving mechanism for driving the dynamic contact part, and the contact system is switched on or off through the movement of the dynamic contact part relative to the static contact part, wherein the driving mechanism is the rotary electromagnetic driving mechanism.

In one embodiment, the static contact portion and the moving contact portion forming the contact assembly are preferably two or more groups, which are driven by the same rotary electromagnetic driving mechanism.

Wherein, in one embodiment, it is preferred that all of the moving contact portions are coaxially connected to the armature of the rotary electromagnetic drive mechanism, based on installation and manufacturing considerations.

Based on the contact type switch assembly, the invention also provides a switch electrical appliance, which comprises the contact type switch assembly for realizing the switch function.

The invention has the following beneficial effects: the invention can effectively improve the output torque of the output piece (namely the armature) of the rotary electromagnetic mechanism through various improvements of the rotary electromagnetic mechanism, and can meet the requirements of opening and closing speeds of the switching device.

Drawings

FIG. 1 is a schematic perspective view of a contact switch assembly of embodiment 1;

FIG. 2 is an exploded view of the structure of the contact switch assembly of embodiment 1;

FIG. 3 is a top view of the contact switch assembly of example 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3 (one, the contact switch assembly is in a closed state);

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 3 (second, contact switch assembly in closed position);

FIG. 6 is a front view of the rotary electromagnetic drive mechanism of embodiment 1 (with the support plate omitted for ease of view, the contact switch assembly in the off state);

fig. 7 is a magnetic force line distribution diagram of the magnetic conductive frame and the armature under the influence of the auxiliary attracting portion in embodiment 1;

fig. 8 is a graph showing the armature attractive force moment by using the design of the auxiliary engaging portion and the design without the auxiliary engaging portion in embodiment 1;

FIG. 9 is a schematic view of the contact switch assembly of embodiment 1 in the open state, wherein the limiting pin is fitted in the waist-shaped hole;

fig. 10 is a schematic view of the contact switch assembly in embodiment 1 in which the limiting pin is fitted in the waist-shaped hole;

FIG. 11 is a top view of the contact switch assembly of example 2;

FIG. 12 is a schematic perspective view of the contact switch assembly of embodiment 3;

FIG. 13 is a cross-sectional view of the contact switch assembly of embodiment 3;

FIG. 14 is a cross-sectional view of the contact switch assembly of example 4;

fig. 15 is a magnetic flux distribution diagram of a flux guiding frame and an armature under the influence of a permanent magnet in example 4.

Detailed Description

For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.

The invention will now be further described with reference to the drawings and detailed description.

Example 1:

referring to fig. 1 to 10, as a preferred embodiment of the present invention, there is provided a contact switch assembly including a contact assembly and an actuating assembly for actuating a switching operation of the contact assembly, wherein the contact assembly includes a fixed stationary contact part 1 and a movable contact part 2, the actuating assembly is a rotary electromagnetic driving mechanism 3 for driving the movable contact part 2, and the movable contact part 2 is driven to move relative to the stationary contact part 1 by the rotary electromagnetic driving mechanism 3, so as to implement contact (closing) or separation (opening) of the movable and stationary contact parts, thereby implementing on or off of the contact switch assembly.

The rotary electromagnetic driving mechanism 3 includes a magnetic conduction frame 31, in this embodiment, the magnetic conduction frame 31 is in a square frame structure, referring to fig. 4, two parallel first sections 31A of the square frame magnetic conduction frame 31 are respectively extended with a protruding static attraction portion 32, and the armature 33 is in a bar-shaped swing arm structure and is rotatably arranged in the magnetic conduction frame 31; specifically, referring to fig. 2, a support plate 4 is fixedly connected to the magnetic carrier 31, and the armature 33 is rotatably pivoted to the support plate 4 via the pivot shaft 5. The coils 34 are wound on the other two parallel second sections 31B of the square frame-shaped magnetic conduction frame 31, so that the magnetic conduction frame 31 is magnetized when the coils 34 are electrified, the winding directions (which can be determined according to the right-hand spiral rule) of the coils 34 on two sides meet the requirement that magnetic fluxes phi 1 and phi 2 generated on the magnetic conduction frame 31 can be converged to overlap the excitation magnetic fields of the two coils 34 on the middle static attraction part 32, and the two static attraction parts 32 generate magnetic attraction couples which rotate towards the static attraction part 32 on the armature 33, so that the armature 33 rotates. The magnetic flux armature generated by the two coils 34 is collected and overlapped on the middle static attraction part 32, so that the magnetic attraction force of the static attraction part 32 to the armature 33 is enhanced, the armature 33 can generate larger torque, the armature 33 is used as an output driving piece of the rotary electromagnetic driving mechanism 3 and is in transmission connection with the movable contact part 2 (the transmission connection mode is described below), the larger torque of the armature 33 means that the movable contact part 2 connected with the armature 33 has a faster closing speed, and the armature 33 can ensure enough torque and speed to rotate the movable contact part 2 to a closing position even if the opening distance of the movable contact part 2 is larger because the torque of the armature 33 is larger, so the contact switch assembly of the embodiment can be provided with larger opening distance. On the other hand, in this embodiment, the torque of the armature 33 is larger, and the opening distance of the opening and closing switch is also larger, so that the characteristics of large torque and large opening distance of the armature 33 can be utilized, when the reset elastic member is set for the armature 33, the reset elastic member with larger elastic coefficient can be matched, and in the process of closing the armature 33, the reset elastic member with larger elastic coefficient is accumulated with larger elastic potential energy through the large torque of the armature 33, so that after the coil 34 is powered off, the reset elastic member with larger elastic potential energy can release more energy to enable the armature 33 to realize quick opening and closing, and the large opening distance of the armature 33 ensures the safety distance of the moving and static contacts at the opening and closing position. Therefore, the contact switch assembly of the embodiment has high switching-on and switching-off speeds and a large switching-off opening distance. Therefore, the contact switch assembly of the embodiment can be used for realizing the frequent on-off function of the switch electrical appliance by virtue of the characteristics of a direct connection simple transmission structure and high on-off speed, and can realize the function of breaking fault current without setting other additional rapid breaking structures (such as a trip link mechanism in a circuit breaker), thereby ensuring the electrical safety performance.

As shown in fig. 5-6, the two static engaging portions 32 respectively include a magnetic engaging surface 321 facing the armature 33, and the magnetic engaging surface 321 is an inclined surface disposed obliquely so as to increase the magnetic engaging area in accordance with the rotation angle of the armature 33. Meanwhile, as a preferred solution, in this embodiment, the extension start portion P of the magnetic attraction surface 321 is located on the first section 31A of the magnetic conductive frame 31, that is, the magnetic attraction surface 321 is an integral inclined plane (not just an unfilled inclined plane on the static attraction portion 32) extending obliquely from the first section 31A of the magnetic conductive frame 31 to the inside of the frame-shaped magnetic conductive frame 31, the magnetic attraction surface 321 makes the cross section of the static attraction portion 32 have a right trapezoid structure, and the design of the integral inclined plane extending obliquely from the first section 31A of the magnetic conductive frame 31 to the inside of the frame can have the maximized magnetic attraction surface to ensure that the armature 33 can be reliably attracted to the closing position. Moreover, although the arrangement of the magnetic attraction surface 321 as an integral inclined surface extending to the edge of the magnetic conduction frame 31 increases the average air gap between the static attraction portion 32 and the armature 33, the attraction force arm is reduced, and the improvement of the attraction force moment is adversely affected, the volume of the static attraction portion 32 towards one side of the armature 33 can be greatly reduced, so that the space between the two static attraction portions 32 is enlarged, and the armature 33 arranged between the two static attraction portions 32 can adopt a structure with larger width (larger cross-sectional area), so that the upper limit of the magnetic saturation of the armature 33 is higher and the oversaturation is not easy to occur; according to the practical tests of the inventor, compared with the structural design of the vertically extending static engaging portion 32 or the static engaging portion 32 with the unfilled corner slope, the torque of the armature 33 is still slightly improved under the same volume structure. That is, although the above-mentioned optimization design has the disadvantage that the force arm of the attraction force of the static attraction portion 32 and the armature 33 is reduced, other improvements can make up for the disadvantage, and the final performance is better.

In this embodiment, the cross section of the static engaging portion 32 is in a right trapezoid shape, so that the static engaging portion 32 gradually contracts from the first section 31A of the magnetically permeable frame 31 to the inside of the frame, so as to ensure that the other side of the static engaging portion 32, which is away from the magnetic engaging surface 321, can be as close to the outermost side of the coil 34 as possible (compared with the static engaging portion 32 having a parallelogram cross section), and the cross section of the static engaging portion 32 may be designed to be a right triangle in other embodiments without considering the optimal design of the end of the static engaging portion 32. In addition, if the upper and lower ends of the coil 34 have a larger margin of safety distance from the first section 31A of the magnetic conductive frame 31, the right-angle sides of the right trapezoid or right triangle may be designed as acute hypotenuses with smaller included angles, so that the cross section of the static attraction portion 32 is a common trapezoid or triangle. Also, in this embodiment, since the static engaging portion 32 is contracted in a direction away from the armature 33, the lateral deviation of the static engaging portion 32 further enlarges the space between the two static engaging portions 32. In this embodiment, the positions of the two static engaging portions 32 are offset, so that the space between the two static engaging portions 32 is further effectively enlarged, and in other embodiments, the two static engaging portions may be offset at the start portion P of the magnetic conductive frame 31, if the structural space allows. Since this embodiment enlarges the space between the two static engaging portions 32, that is, the mountable space of the armature 33, in the case where the mountable space of the armature 33 is large, the armature 33 can adopt a structure with a larger width (larger cross-sectional area), so that the upper limit of magnetic saturation of the armature 33 is higher to achieve a larger torque.

In this embodiment, in cooperation with the overall inclined structure of the magnetic attraction surface 321, the length of the strip-shaped swing arm of the armature 33 is approximately equal to the distance between the initial portions P of the two magnetic attraction surfaces 321 on the first section 31A of the magnetic carrier 31, so that, due to the armature 33 being sufficiently long, even the magnetic attraction surface 321 near the initial portion P can generate a certain attraction action on the armature 33, the armature 33 and the whole magnetic attraction surface 321 achieve a corresponding magnetic attraction of substantially the whole surface, and the magnetic attraction area is maximized.

In order to ensure that the magnetic attraction surfaces 321 attract the armature 33 more reliably, in this embodiment, the magnetic attraction surfaces 321 of the two static attraction portions 32 are inclined planes parallel to each other, and the width of the bar-shaped swing arm of the armature 33 is equal to the parallel interval, so that in the attraction state, the armature 33 can be abutted against the two magnetic attraction surfaces 321 at an adaptive angle, and the reliability of closing is ensured.

In this embodiment, the other side of the bar-shaped swing arm away from the magnetic attraction surface 321 is a partially missing abdication structure, so that the width of the armature 33 is maximized, and meanwhile, the partially missing abdication design can avoid the armature 33 from interfering with the coil 34, and on the other hand, by the arrangement, the coil 34 can be wound with more turns, so that the magnetic conduction frame 31 obtains stronger electromagnetic driving force.

In this embodiment, a square frame-shaped magnetic conductive frame 31 is taken as an example, in other embodiments, the magnetic conductive frame 31 may be a closed frame-shaped substrate with other shapes, for example, a round frame-shaped structure, the static attraction portion 32 may be disposed on two opposite first arc segments of the round frame-shaped magnetic conductive frame, and the coil is wound on the other two opposite second arc segments of the round frame-shaped magnetic conductive frame. The square frame-shaped magnetic conduction frame 31 is adopted in the embodiment, so that the manufacturing and the installation are more convenient.

In addition, referring to fig. 2, in the present embodiment, the magnetic conductive frame 31 is formed by butt-fixing a semi-closed first magnetic conductive frame 311 and a second magnetic conductive frame 312, so as to facilitate the coil 34 to be sleeved in, and each static attraction portion 32 in the present embodiment integrally extends from the first magnetic conductive frame 311 and the second magnetic conductive frame 312 respectively. In a specific implementation manner, the first magnetic conduction frame 311 and the second magnetic conduction frame 312 may be formed by stacking a plurality of substantially E-shaped silicon steel sheets.

Referring to fig. 5 and 6, since the embodiment adopts a design of a larger armature opening distance and a magnetic attraction surface 321 of an inclined plane, an average air gap between the static attraction portion 32 and the armature 33 is increased, especially a distance between the end of the armature 33 and the static attraction portion 32 is increased, in order to compensate for the problem that the average air gap between the static attraction portion 32 and the armature 33 is increased, in this embodiment, an auxiliary attraction portion 36 is further extended from two opposite first sections 31A of the magnetic conductive frame 31 toward the end of the bar-shaped swing arm of the armature 33, and the auxiliary attraction portion 36 is disposed adjacent to the static attraction portion 32. The auxiliary engaging portion 36 is a protrusion having a smaller volume toward the end of the armature 33 on the magnetic carrier 31 than the stationary engaging portion 32, so that the magnetic attraction force of the auxiliary engaging portion 36 to the armature 33 is smaller than the magnetic attraction force of the engaging portion 32 to the armature 33. In the early stage of the rotational stroke in which the stationary engaging portion 32 attracts the armature 33, the auxiliary engaging portion 36 accelerates the armature 33 toward the stationary state by attracting the armature 33The rotation of the engaging portion 32, the auxiliary engaging portion 36, by attracting the armature 33, slows down the rotation of the armature toward the stationary engaging portion 32 at a later stage of the rotational stroke in which the stationary engaging portion 32 attracts the armature 33. 7-8, FIG. 7 shows the distribution of magnetic force lines to the magnetic carrier 31 and the armature 33 after design of the auxiliary attracting portion, the auxiliary attracting portion 36 generating an auxiliary magnetic attraction force F to the armature 33 ₀ And because the auxiliary attraction part 36 is close to the armature 33, the magnetic force line density of the armature 33 in the early-stage closing stroke (i.e. when the air gap is large) is effectively encrypted, and the auxiliary magnetic attraction force F ₀ Moment arm L of (2) ₀ The initial stage is also larger, so that the attractive force moment of the armature 33 in the early-stage closing stroke can be effectively improved. Fig. 8 is a comparison of the design of the auxiliary engaging portion and the design without the auxiliary engaging portion versus the armature engaging moment, and it can be seen that the design of the auxiliary engaging portion 36 in this embodiment has additional dual functions than the design without the auxiliary engaging portion, namely: the method can make the armature 33 fast and slow after closing, thereby improving the torque of the armature 33 in the early-stage stroke of closing (i.e. when the air gap is large), accelerating the closing starting speed, and reducing the torque of the armature 33 in the later-stage stroke of closing (i.e. when the air gap is small), so as to prevent the armature 33 from generating impact rebound when the speed of the armature 33 is too fast.

Preferably, the end of the armature 33 in this embodiment is a convex arc-shaped protrusion structure, and the end of the auxiliary engaging portion 36 near the armature 33 has an arc-shaped concave notch matching the end of the armature 33, so that the magnetic attraction force of the auxiliary engaging portion 36 to the armature 33 is more stable and balanced, the magnetic pole area is larger, and the attraction force is larger in the rotation stroke of the armature 33. The structural form of the end of the auxiliary engaging portion 36 and the structural form of the end of the armature 33 determine the distance between the auxiliary engaging portion 36 and the armature 33, so that the magnitude of the attractive force moment of the auxiliary engaging portion 36 to the armature 33 can be directly affected.

Referring again to fig. 6, by analysis, it can be seen that: the magnetic attraction surface 321 of the static attraction portion 32 is a working main air gap, and the magnetic attraction area and the gap between the static attraction portion and the armature 33 directly influence the magnetic conductance of the working air gap, so that the magnetic flux of the main air gap and the attraction force to the armature 33 are determined. The angle a of inclination of the magnetic attraction surface 321 influences the force arm of the attraction force of the armature 33 in the closing position, since the attraction force direction is perpendicular to the magnetic attraction surface 321. The inclination angle a is between 0 and 90 degrees, and the armature attractive force arm is longest when 90 degrees, but at this time, the armature width D may become very small, so that the armature is easy to saturate, the attractive force moment is not necessarily large, and meanwhile, the width D of the armature is also related to the distance D1 between the static attraction portion 32 and the second section 31B of the magnetic conduction frame 31 and the thickness of the static attraction portion 32 itself, so that different inclination angles of the magnetic attraction surface 321 can be designed according to requirements, and the armature can be matched with other characteristic dimensions to be adaptively designed to meet different design requirements, and the armature is not limited to the dimensions and angles expressed by the illustrations in the embodiment.

Further, the higher the protruding height H0 of the static engagement portion 32 is, the closer the static engagement portion 32 is to the armature, and if the point Q is the point on the static engagement portion 32 closest to the armature 33, the larger the H0 is, the smaller the distance D2 between the point Q and the armature is, and the smaller the D2 is, the static engagement portion 32 attracts the armature F ₁ The greater, but at the same time, the force F of attraction of the point Q on the static attraction portion 32 to the armature is caused ₁ Closer to the center of rotation of the armature 33, so that the point Q on the static attraction portion 32 is at the arm L of the resultant force of the attraction force of the armature ₁ And (3) reducing. From this analysis, it is found that, since the higher the protrusion height H0 of the static engaging portion 32 is, the higher the torque of the armature 33 is not necessarily, so in this embodiment, the lower the protrusion height H0 of the static engaging portion 32 is, the installation space between the two static engaging portions 32 can be enlarged by controlling the protrusion height H0 of the static engaging portion 32 to be lower.

As shown in fig. 1, 2 and fig. 9 and 10, a stop pin 6 is inserted and fixed at the eccentric position of the armature 33, a waist-shaped hole 41 is formed in the support plate 4 at a position corresponding to the stop pin 6, the stop pin 6 is fitted in the waist-shaped hole 41, and when the contact switch is switched on, the stop pin 6 abuts against one end of the waist-shaped hole 41 to limit the switch-off position of the armature 33 (and the movable contact part 2). The magnetic conduction frame 31 is fixedly inserted with a first spring hanging rod 7, one end of a reset tension spring 8 is hooked on the first spring hanging rod 7, the other end of the reset tension spring is hooked on a limiting pin 6, so that when the armature 33 is driven by the rotary electromagnetic driving mechanism 3 to rotate to a closing position, the reset tension spring 8 stretches and stores energy, and after the coil 34 of the rotary electromagnetic driving mechanism 3 is powered off, the armature 33 is reset to a separating position through the elastic force of the reset tension spring 8. As an elastic restoring element, the restoring tension spring 8 can be replaced by other elastic restoring element structures (the installation mode is adaptively changed) in other embodiments, such as a torsion spring, a compression spring, a spring piece, and the like.

The movable contact part 2 is in transmission connection with the armature 33, referring to fig. 1-2, the movable contact part 2 comprises a rotating disc piece 21 and a contact piece 22 arranged in the rotating disc piece 21, the rotating disc piece 21 and the armature 33 are coaxially connected, specifically, two eccentric inserted rods 91 and 92 are simultaneously connected with the rotating disc piece 21 and the armature 33 in a sleeved mode, two ends of the contact piece 22 are provided with movable contacts, and when the movable contact part 2 rotates to a closing position, the movable contacts at two ends of the contact piece 22 are respectively connected with the fixed contacts on the two fixed contact parts 1, so that load communication is realized.

In this embodiment, the movable contact portion 2 and the armature 33 are coaxially connected, that is, directly receive the transmission of the rotary electromagnetic driving mechanism 3 to realize the rotary motion of the movable contact portion 1, so that the transmission efficiency is high, the number of parts is reduced, the transmission connection structure is simple, and the reliability and the service life are greatly improved.

In addition, it should be especially noted that, in this embodiment, the linkage mode of directly coaxially connecting the rotating disc member 21 and the armature 33 is adopted, and no speed reducing mechanism or multiple link mechanisms are provided, so that the torque requirement for the output of the rotary electromagnetic driving mechanism 3 is higher, while in this embodiment, the output torque of the rotary electromagnetic driving mechanism 3 is greatly improved through the structural design of the magnetic conduction frame 31 (including the structure of the static attraction portion 32, the auxiliary attraction portion 36, and the like), so that this embodiment can be realized by adopting a simple transmission structure of directly coaxially connecting the rotating disc member 21 and the armature 33.

And, the turntable 21 and the armature 33 are coaxially connected through the eccentric inserting rods 91 and 92, so that the rotary electromagnetic driving mechanism 3 can be more easily connected with the plurality of moving contact portions 2, for example, in this embodiment, a group of contact assemblies are respectively arranged on two axial sides of the armature 33 (in this embodiment, a group of contact assemblies comprises one moving contact portion 2 and two static contact portions 1), the moving contact portions 2 in the two groups of contact assemblies are simultaneously inserted and connected with the eccentric inserting rods 91 and 92 (that is, all the moving contact portions 2 are coaxially connected with the armature 33), and therefore, an additional structure is not required, and only the connection of the eccentric inserting rods 91 and 92 can be used for realizing that one rotary electromagnetic driving mechanism 3 drives the two moving contact portions 2 to act. In this embodiment, based on the above structural design, two groups of contact assemblies including two moving contact portions 2 and a static contact portion 1 can be disposed in the axial direction of the armature 33, so that the present embodiment has wider application and electrical performance, for example: it can be used to connect two switch breakpoints in parallel in one contact loop, to increase the arc-extinguishing ability, or to form a contact loop for driving two simultaneously (for example, applied to a bipolar breaker).

Example 2:

referring to fig. 11, the present embodiment provides a contact switch assembly, which is substantially similar to embodiment 1, except that in the present embodiment, the rotary electromagnetic driving mechanism 3 is connected in series with four groups of contact assemblies through the inserting rods 91A, 92A, and then one rotary electromagnetic driving mechanism 3A can drive the moving contact portions of the four contact assemblies to act simultaneously. This example can be used to form four contact loops or to connect four switching breakpoints in series in one contact loop to increase arc extinction capability.

Besides the series connection of the two groups of contact assemblies in the embodiment 1 and the series connection of the four groups of contact assemblies in the embodiment, a person skilled in the art can set other numbers of contact assemblies to be connected in series according to actual needs, and the implementation is free from technical barriers.

Example 3:

this embodiment proposes a contact switch assembly, referring to fig. 12 and 13, which is substantially similar to embodiment 1, except that the structure of the coil and the magnetically permeable frame is further expanded on the basis of embodiment 1. In this example, the magnetic conductive frame includes a square frame-shaped matrix 300 (the structure of the square frame-shaped matrix 300 corresponds to the magnetic conductive frame 31 in embodiment 1), at least one set of expansion poles 301 symmetrically expanded outwards at two second sections 31B of the square frame-shaped matrix 300, the expansion poles 301 are connected in parallel to the square frame-shaped matrix 300, each expansion pole 301 is wound with a coil 34, and the winding directions of all coils 34 are such that the magnetic fluxes generated on the magnetic conductive frame are all converged to superimpose the exciting magnetic fields of all coils 34 on the static attraction portion in the middle.

Through the arrangement of the embodiment, the magnetic fluxes generated by the coils on the expansion pole 301 and the frame-shaped base 300 pass through the armature, so that the attractive force of the static attraction part can be effectively increased and the torque of the armature can be improved under the condition that the armature is not saturated. In this embodiment, only one set of expansion poles is amplified, but two or three sets of expansion poles can be amplified according to actual requirements.

The structure of the rotary electromagnetic driving mechanism of the embodiment is more suitable for being applied to occasions with higher torque requirements on the armature, for example, the structure can be applied to the situation that four groups of contact assemblies of the embodiment 2 are connected in series.

Example 4:

with continued reference to fig. 14 and 15, this embodiment provides a contact switch assembly, which is basically similar to embodiment 1, and is different in that a permanent magnet 35 is further fixedly disposed at the end of the static attraction portion 32A, and the permanent magnet 35 applies permanent magnetic attraction to the armature 33A to assist the static attraction portion 32A to attract and fix the armature 33A, and since the permanent magnet 35A is disposed to assist the attraction of the armature 33A in the closing position, the contact switch assembly is not realized by simply relying on the magnetic attraction generated by the coil and the magnetic conductive frame, so that after closing, a larger coil current is not always maintained, and power loss can be reduced.

In this embodiment, the permanent magnet 35 is disposed at the end of the static engaging portion 32A, so that the permanent magnet 35 is closer to the rotation center of the armature 33A, the attractive force arm of the permanent magnet 35 is smaller, and the magnetic attraction of the permanent magnet 35 to the armature 33A is smaller during opening, so as to prevent the erroneous operation of the armature 33. In other embodiments, other permanent magnet structures, such as a C-shaped permanent magnet sleeved on the outer periphery of the static attraction portion 32A, may be used, but this solution occupies a large space, or a layer of permanent magnet is attached to the magnetic attraction surface 321A of the static attraction portion 32A, but this solution increases the air gap between the magnetic attraction surface 321A and the armature 33A, which is not the preferred design solution of the permanent magnet 35 in this embodiment.

In this embodiment, the permanent magnet 35 includes a magnetic pole surface 351 coplanar with the magnetic attraction surface 321A, and when the stationary attraction portion 32A attracts the armature a, the swing arm of the armature 33A is abutted against the magnetic attraction surface 321A and the magnetic pole surface 351, and the magnetic attraction surface 321A and the magnetic pole surface 351 generate attraction force F ₂ And F ₃ Thus, a larger magnetic attraction couple is obtained to the armature 33A, and the armature 33A is reliably attracted to the closing position.

Example 5:

the present embodiment provides a switching device, which includes, in addition to any of the contact switch assemblies of embodiments 1 to 4, other components, such as a connection component, an arc extinguishing component, a remote signaling component, and the like, and generally has a protective outer casing. Since the main improvement point of the switching device of this embodiment is the contact switch assembly, other components can be realized by the prior art means, and the detailed description thereof will not be provided herein. The switching device of the embodiment refers to GB/T5226.1-2019/IEC 60204-1:2016, i.e. an electrical apparatus for switching on or off one or several circuit currents, the specific element form of which may be a circuit breaker, a relay, a disconnector, etc.; the device is particularly suitable for being used in occasions needing frequent switching and/or breaking of large fault current. The switching device of this embodiment includes any of the contact switch assemblies of embodiments 1 to 4, and therefore has the corresponding advantageous effects, and the description thereof will not be repeated.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (22)

1. The rotary electromagnetic driving mechanism comprises a magnetic conduction frame, coils and an armature, wherein the magnetic conduction frame comprises a closed frame-shaped base body, two opposite first sections of the frame-shaped base body extend out of a static attraction part respectively, two opposite second sections of the frame-shaped base body are wound with the coils to magnetize the magnetic conduction frame, and the armature is of a strip-shaped swing arm structure and is rotatably arranged in the frame-shaped base body, and the rotary electromagnetic driving mechanism is characterized in that: the magnetic fluxes generated by the coils wound on the two second sections on the frame-shaped base body are converged to superimpose the exciting magnetic fields on the static attraction part, and the static attraction part generates a magnetic attraction couple rotating towards the armature.

2. The rotary electromagnetic drive according to claim 1, wherein: the two static attraction surfaces respectively comprise a magnetic attraction surface facing the armature, and the magnetic attraction surfaces are inclined planes which are obliquely arranged.

3. The rotary electromagnetic drive according to claim 2, wherein: the magnetic attraction surface is an integral inclined surface which extends from the first section of the frame-shaped base body to the inside of the frame body in an inclined mode.

4. A rotary electromagnetic drive according to claim 3, wherein: the section of the static suction part is trapezoid or triangle, so that the static suction part is gradually contracted from the first section of the frame-shaped matrix to the inside of the frame.

5. The rotary electromagnetic drive according to claim 4, wherein: the static engaging portion contracts in a direction away from the armature.

6. A rotary electromagnetic drive according to claim 3, wherein: the two static attraction parts are respectively staggered at the positions of the frame-shaped base body.

7. A rotary electromagnetic drive according to claim 3, wherein: the length of the armature bar-shaped swing arm is approximately equal to the distance between the two magnetic attraction surfaces at the initial part of the first section of the frame-shaped base body.

8. The rotary electromagnetic drive according to claim 2, wherein: the magnetic attraction surfaces of the two static attraction parts are inclined planes which are parallel to each other, and the width of the strip-shaped swing arm of the armature is equal to the parallel interval.

9. The rotary electromagnetic drive according to claim 1 or 8, wherein: the armature is in a locally missing abdication structure at the other side of the strip-shaped swing arm, which is far away from the magnetic attraction surface.

10. The rotary electromagnetic drive according to claim 1, wherein: the frame-shaped base body is of a square frame-shaped structure, the two static attraction parts extend from two parallel first sections of the frame-shaped base body, and the coil is wound on the other two parallel second sections of the frame-shaped base body.

11. The rotary electromagnetic drive according to claim 1, wherein: the magnetic conduction frame also comprises at least one group of expansion polar posts which are symmetrically and outwards expanded at two second sections of the frame-shaped base body, the expansion polar posts are connected with the frame-shaped base body in parallel, and each expansion polar post is wound with a coil so as to simultaneously superimpose the excitation magnetic field of the coil on each expansion polar post on the static attraction part.

12. The rotary electromagnetic drive according to claim 1, wherein: two opposite first sections of the frame-shaped base body extend out of the tail ends of the strip-shaped swing arms of the armatures respectively to form auxiliary suction parts, and the auxiliary suction parts are arranged adjacent to the static suction parts.

13. The rotary electromagnetic drive according to claim 12, wherein: the tail end of the strip-shaped swing arm of the armature is of a convex arc-shaped bulge structure, and the tail end of the strip-shaped swing arm of the auxiliary suction part, which faces the armature, is of an arc-shaped concave notch matched with the tail end of the strip-shaped swing arm of the armature.

14. The rotary electromagnetic drive according to claim 1, wherein: the static attraction part is also fixedly provided with a permanent magnet, and the permanent magnet applies permanent magnet attraction force to the armature to assist the static attraction part to attract and fix the armature.

15. The rotary electromagnetic drive according to claim 14, wherein: the permanent magnet is fixedly arranged at the end part of the static attraction part.

16. The rotary electromagnetic drive according to claim 15, wherein: the permanent magnet at least comprises a magnetic pole face coplanar with the magnetic attraction face, and when the static attraction part attracts the armature, the armature can be clung to the magnetic attraction face and the magnetic pole face, so that the strip-shaped armature is attracted through the magnetic attraction face of the static attraction part and the magnetic pole face of the permanent magnet.

17. The rotary electromagnetic drive according to claim 1, wherein: the device also comprises an elastic reset piece, wherein the elastic reset piece directly or indirectly acts on the armature to reset the armature.

18. The rotary electromagnetic drive according to claim 1, wherein: the magnetic conduction frame is formed by butt-joint and fixation of two semi-closed split structures.

19. The contact switch assembly comprises a fixed static contact part and a movable dynamic contact part, and further comprises a driving mechanism for driving the dynamic contact part, and the contact system is switched on or switched off by the movement of the dynamic contact part relative to the static contact part, and is characterized in that: the drive mechanism is a rotary electromagnetic drive mechanism according to any one of claims 1 to 17.

20. The contact switch assembly of claim 19, wherein: the static contact part and the dynamic contact part which form the contact assembly are more than two groups and are all driven by the same rotary electromagnetic driving mechanism.

21. The contact switch assembly of claim 20, wherein: all the movable contact parts are coaxially connected with the armature of the rotary electromagnetic driving mechanism.

22. Switching device, including realizing its switching function's contact switch assembly, its characterized in that: the contact switch assembly is the contact switch assembly of any one of claims 19-21.

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