CN221226128U - DC contactor and electric device - Google Patents

Abstract

The application relates to a direct current contactor, comprising: the first fixed contact and the second fixed contact; a moving contact; and an arc extinguishing chamber in which a contact surface of the first stationary contact, a contact surface of the second stationary contact, and a moving contact are arranged, the direct current contactor including a first magnet and a second magnet for magnetic arc quenching, a lower end portion of the first stationary contact having a first end surface region and a second end surface region as a contact surface, a lower end portion of the second stationary contact having a first end surface region and a second end surface region as a contact surface, wherein the first magnet is positioned with respect to the first stationary contact such that the first magnet is at least partially arranged directly below the first end surface region of the lower end portion of the first stationary contact, and the second magnet is positioned with respect to the second stationary contact such that the second magnet is at least partially arranged directly below the first end surface region of the lower end portion of the second stationary contact. The present application also relates to an electrical apparatus mounted with the dc contactor.

Description

DC contactor and electric device

Technical Field

The present application relates generally to the field of contactors, and more particularly to a dc contactor, particularly a non-polar dc contactor. Furthermore, the application relates to an electrical device in which the direct current contactor is mounted.

Background

The contactor is widely used as a high-power switching device for power, distribution and power utilization. The contactor can not only switch on and off the circuit, but also has a low voltage release protection effect. Contactors may be used as electronic control devices in automatic control circuits, which are actually "reclosers" that use a smaller current to control a larger current.

In recent years, along with the development of new energy electric vehicles, charging piles and energy storage batteries, the application of high-voltage direct-current contactors is becoming more and more popular, and the high-voltage direct-current contactors become necessary electrical elements for controlling the on-off of circuits in the electric vehicles and the charging piles.

The direct current contactor is one of contactors, and most of the existing direct current contactors adopt a movable reed direct-acting (also called a solenoid direct-acting) scheme, and the principle is that the direct current contactor is driven by a coil, and electromagnetic force is generated through a magnetic circuit with a certain shape around the periphery, so that initial kinetic energy is provided for the connection of a moving contact.

However, the dc contactor generates an arc during the process of joining and breaking, and the arc has a great damage to the dc contactor, which affects the electrical life of the dc contactor. In addition, the higher the connected load voltage is, the more difficult the electric arc is to break, so that the moving and static contacts cannot be separated completely in time, and the electric arc breaking capacity of the contactor is an important standard for measuring the performance of the contactor.

The arc extinguishing mode commonly used in the industry is magnetic quenching, and charged particles are influenced by Lorentz magnetic force in a magnetic field, so that an arc is elongated, and an arc extinguishing effect is achieved. However, the magnetic strength of the currently known "magnetic quenching" is often not large enough, and the quenching effect is poor. Accordingly, it is desirable to further improve the arc breaking capability of the contactor.

Furthermore, due to the production costs and/or installation space, it is also desirable to achieve a cost-effective, simple to produce and/or compact quenching scheme for the dc contactor.

Disclosure of utility model

It is therefore an object of the present application to provide a dc contactor, in particular a non-polar dc contactor, which overcomes at least one of the drawbacks of the prior art, by means of which the arc breaking capacity of the contactor can be further improved. In addition, the dc contactor according to some embodiments of the present application may also achieve an arc extinction scheme that is cost effective, simple to manufacture, and/or compact. Further, the present application aims to provide an electrical apparatus mounted with the dc contactor.

According to a first aspect of the present application, there is provided a direct current contactor comprising: the first fixed contact and the second fixed contact; the movable contact can move towards the first fixed contact and the second fixed contact along a first direction, so that the contact surface of the movable contact is engaged with the contact surface of the first fixed contact and the contact surface of the second fixed contact, and the movable contact can move away from the first fixed contact and the second fixed contact along the first direction, so that the contact surface of the movable contact is disconnected with the contact surface of the first fixed contact and the contact surface of the second fixed contact; and an arc extinguishing chamber in which a contact surface of the first stationary contact, a contact surface of the second stationary contact, and a moving contact are arranged, characterized in that the direct current contactor includes a first magnet and a second magnet for magnetic quenching, a lower end portion of the first stationary contact has a first end surface area and a second end surface area as a contact surface, a lower end portion of the second stationary contact has a first end surface area and a second end surface area as a contact surface, wherein the first magnet is positioned with respect to the first stationary contact such that the first magnet is at least partially arranged directly below the first end surface area of the lower end portion of the first stationary contact, and the second magnet is positioned with respect to the second stationary contact such that the second magnet is at least partially arranged directly below the first end surface area of the lower end portion of the second stationary contact.

In some embodiments, the first magnet has an overlap with a projection of a first end surface region of the lower end of the first stationary contact in the first direction, and the first magnet does not have an overlap with a projection of a second end surface region of the lower end of the first stationary contact in the first direction; and the second magnet has an overlap with a projection of a first end surface area of a lower end portion of the second stationary contact in the first direction, and the second magnet has no overlap with a projection of a second end surface area of a lower end portion of the second stationary contact in the first direction.

In some embodiments, a projection of the first magnet in the first direction is at least sixty percent within a projection of the first end face region of the lower end of the first stationary contact in the first direction; and a projection of the second magnet in the first direction falls within a projection of the first end surface area of the lower end portion of the second stationary contact in the first direction by at least sixty percent.

In some embodiments, at least eighty percent of a projection of the first magnet in the first direction falls within a projection of the first end face region of the lower end of the first stationary contact in the first direction; and a projection of the second magnet in the first direction falls within a projection of the first end surface area of the lower end portion of the second stationary contact in the first direction by at least eighty percent.

In some embodiments, the projection of the first magnet in the first direction falls entirely within the projection of the first end surface region of the lower end of the first stationary contact in the first direction; and the projection of the second magnet in the first direction completely falls into the projection of the first end surface area of the lower end part of the second fixed contact in the first direction.

In some embodiments, the lower end of the first stationary contact is provided with a first void in the region of the first end surface area, such that the first end surface area of the first stationary contact is above the second end surface area as a contact surface; the lower end of the second fixed contact is provided with a second hollow part in the range of the second end surface area, so that the first end surface area of the second fixed contact is positioned above the second end surface area serving as a contact surface.

In some embodiments, the first end surface region of the first stationary contact is raised up a first distance relative to the second end surface region as the contact surface, and the first end surface region of the second stationary contact is raised up a second distance relative to the second end surface region as the contact surface.

In some embodiments, the first distance and the second distance are set in a range of values between 1mm and 5mm or 10mm, respectively.

In some embodiments, the first magnet extends into a first recess of the first stationary contact and the second magnet extends into a second recess of the second stationary contact.

In some embodiments, the lower end of the first stationary contact and the lower end of the second stationary contact are each configured as an L-shaped stepped lower end.

In some embodiments, the first magnet is positioned relative to the first stationary contact such that an upper surface of the first magnet is at least partially disposed above a second end surface region of a lower end of the first stationary contact, and the second magnet is positioned relative to the second stationary contact such that an upper surface of the second magnet is at least partially disposed above a second end surface region of a lower end of the second stationary contact.

In some embodiments, an upper surface of the first magnet is disposed at least partially above the second end surface region of the lower end of the first stationary contact by a third distance; and an upper surface of the second magnet is disposed at least partially above the second end surface region of the lower end of the second stationary contact by a fourth distance.

In some embodiments, the third distance and the fourth distance are set in a range of values between 0.5 millimeters and 2 millimeters or 5 millimeters, respectively.

In some embodiments, the first magnet includes a third recess facing the first stationary contact; and the second magnet includes a fourth cutout facing the second stationary contact; wherein the third recess is arranged at least partially directly below the first recess and the fourth recess is arranged at least partially directly below the second recess.

In some embodiments, the first and third voids are proximate to each other such that the first and third voids at least partially coincide; and the second and fourth pockets are proximate to each other such that the second and fourth pockets at least partially coincide.

In some embodiments, the third cutout of the first magnet is configured such that a longitudinal section of the first magnet forms a square with a U-shaped recess; and the fourth cutout of the second magnet is configured such that a longitudinal section of the second magnet forms a square with a U-shaped recess.

In some embodiments, the arc chute is provided with a first opening into which the second end face region of the lower end of the first stationary contact enters and a second opening into which the second end face region of the lower end of the second stationary contact enters, wherein the first end face region of the lower end of the first stationary contact is seated against a first limit boss formed by the arc chute wall in the arc chute without entering the first opening, and the first end face region of the lower end of the second stationary contact is seated against a second limit boss formed by the arc chute wall in the arc chute without entering the second opening.

In some embodiments, the first magnet is abutted against the first limit boss outside the arc extinguishing chamber, so that the first magnet and the first end face area of the lower end of the first fixed contact are abutted against two sides of the first limit boss adjacent to each other respectively; and the second magnet is leaned against the second limiting boss outside the arc extinguishing chamber, so that the second magnet and the first end surface area of the lower end part of the second fixed contact are respectively leaned against two sides of the second limiting boss adjacent to each other.

In some embodiments, the dc contactor has only a single pair of magnetic blowout magnet pairs formed by the first and second magnets.

In some embodiments, the first magnet and the second magnet are arranged such that the dc contactor forms a non-polar dc contactor.

In some embodiments, the dc contactor includes a drive assembly configured to drive the moving contact in motion within the arc chute.

In some embodiments, four arc extinguishing units are configured in the arc extinguishing chamber, which are respectively located at four corners of the arc extinguishing chamber and are designed identically to each other.

According to a second aspect of the application, an electrical device is provided, characterized in that the electrical device comprises a first conductor, a second conductor and a dc contactor according to some embodiments of the application, the first conductor being in conductive connection with a first stationary contact of the dc contactor and the second conductor being in conductive connection with a second stationary contact of the dc contactor. The direct current contactor according to some embodiments of the present application may be applied to an electric device such as an electric vehicle, a charging device, or a charging pile.

Drawings

The application is described in more detail below with the aid of specific embodiments with reference to the accompanying drawings. The schematic drawings are briefly described as follows:

Fig. 1 illustrates a top view of a dc contactor according to some embodiments of the application;

fig. 2 shows a cross-sectional view of the dc contactor of fig. 1 taken along line A-A;

FIG. 3 shows a cross-sectional view of the DC contactor of FIG. 1 taken along line B-B;

Fig. 4 shows a partial perspective view of the dc contactor of fig. 1, showing the arc chute of the dc contactor;

fig. 5 shows a partial cross-sectional view of the dc contactor of fig. 1, showing the arc chute of the dc contactor;

fig. 6 shows a schematic diagram of a stationary contact of the dc contactor of fig. 1;

FIG. 7 shows a schematic view of a magnet of the DC contactor of FIG. 1;

Fig. 8 shows a schematic diagram of the arc extinction effect of the dc contactor in a first operating state;

fig. 9 shows a schematic diagram of the arc extinction effect of the dc contactor in the second operating state.

Detailed Description

The present application will now be described with reference to the accompanying drawings, which illustrate several embodiments of the application. It should be understood, however, that the application may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein; indeed, the embodiments described hereinafter are intended to provide a more complete disclosure of the present application and to fully illustrate the scope of the application to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments.

It should be understood that the terminology herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present application. All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. Well-known functions or constructions may not be described in detail for brevity and/or clarity.

In this document, spatially relative terms such as "upper," "lower," "left," "right," "front," "rear," "high," "low," and the like may be used to describe one feature's relationship to another feature in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, when the device in the figures is inverted, features that were originally described as "below" other features may be described as "above" the other features. The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the relative spatial relationship will be explained accordingly.

In this document, the term "a or B" includes "a and B" and "a or B", and does not include exclusively only "a" or only "B", unless otherwise specifically indicated.

In this document, the terms "schematic" or "exemplary" mean "serving as an example, instance, or illustration," rather than as a "model" to be replicated accurately. Any implementation described herein by way of example is not necessarily to be construed as preferred or advantageous over other implementations. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the detailed description.

As used herein, the term "substantially" is intended to encompass any minor variation due to design or manufacturing imperfections, tolerances of the device or element, environmental effects and/or other factors.

In this context, the term "part" may be any proportion of parts. For example, it may be greater than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or even 100%, i.e., all.

In addition, for reference purposes only, the terms "first," "second," and the like may also be used herein, and are thus not intended to be limiting. For example, the terms "first," "second," and other such numerical terms referring to structures or elements do not imply a sequence or order unless clearly indicated by the context.

Some embodiments of the present application will now be described in more detail with reference to the accompanying drawings.

As shown in fig. 1 to 7, the direct current contactor 100 may include a first stationary contact 11, a second stationary contact 12, a moving contact 30, and an arc extinguishing chamber 40. The arc chute 40 may be surrounded by insulated arc chute walls 401, 402 (e.g., nylon plastic walls). The lower end 13 of the first stationary contact 11 and the lower end 13 of the second stationary contact 12 may extend into the arc extinguishing chamber 40 such that the contact surface of the first stationary contact 11 and the contact surface of the second stationary contact 12 may remain in the arc extinguishing chamber 40. It should be appreciated that the lower surface of the lower end portion 13 of the first stationary contact 11 may include a first end surface area 111 that is not a contact surface and a second end surface area 112 that is a contact surface. Likewise, the lower surface of the lower end portion 13 of the second stationary contact 12 may include a first end surface region 111 that is not a contact surface and a second end surface region 112 that is a contact surface, see fig. 6.

Also arranged in the arc chamber 40 is a moving contact 30, for example in the form of a moving contact plate. The moving contact 30 is movable in a first direction, i.e. the vertical direction F, towards the first and second stationary contacts 11, 12 such that the contact surface of the moving contact 30 engages with the contact surface 112 of the first stationary contact 11 and the contact surface 112 of the second stationary contact 12. Furthermore, the movable contact 30 can move away from the first stationary contact 11 and the second stationary contact 12 in a first direction, i.e., in the vertical direction F, such that the contact surface of the movable contact 30 is separated from the contact surfaces of the first stationary contact 11 and the second stationary contact 12.

In order to drive the movement of the moving contact 30 within the arc chute 40, the dc contactor 100 may include a drive assembly 29. As shown in fig. 2 and 3, in the present embodiment, the driving assembly 29 may include a push rod 1 and a magnetic control assembly, and the magnetic control assembly may be used to drive the push rod 1 to move, so that the moving contact 30 installed at the upper end of the push rod 1 is engaged with the first fixed contact 11 and the second fixed contact 12, respectively. The magnetic control assembly may be arranged on a support 2, for example in the form of a steel cup, and may comprise a coil assembly (comprising a coil former 3 and a coil 4), a magnetic circuit assembly (for example a bearing 5, a magnetically permeable sleeve 6, a moving core 7, etc.). To handle the operation of the coil assembly, the dc contactor 100 may include a control circuit board 8 (e.g., a PCB circuit board). By manipulation of the control circuit board 8, the coil assembly can generate an electromagnetic effect under which the plunger 7 can move in the vertical direction F. The push rod 1 is able to move with the plunger 7 due to engagement within the plunger 7. The push rod 1 can extend further into the arc extinguishing chamber 40, causing the moving contact 30 on the upper end of the push rod 1 to move forward in the vertical direction F. Advantageously, in order to maintain a smooth and reliable movement, additional travel springs 66 and/or fasteners 65 may be mounted on the push rod 1, the travel springs 66 being used for return of the moving contacts after the coil is powered off. Additionally or alternatively, a contact spring 64 may be mounted for the moving contact 30, said contact spring 64 may apply an initial pressing force to the moving contact. Smooth and reliable movement can on the one hand advantageously promote reliable contact between the moving contact 30 and the stationary contacts 11, 12 and on the other hand can advantageously avoid damage due to undesired collisions between the moving contact 30 and the stationary contacts 11, 12.

It should be understood that the drive assembly for driving the moving contact 30 within the arc chute 40 may have a number of variations and should not be limited to the current embodiment. For example, in some embodiments, the drive assembly may be driven in an electric drive, and the scheme for electric drive may be implemented with reference to schemes known in the art. In some embodiments, the drive assembly may be hydraulically driven, and the solution for hydraulic drive may be implemented with reference to solutions known in the art. Since the specific driving scheme is not central to the present utility model, it is not described in detail herein.

Additionally or alternatively, the dc contactor 100 may include a micro switch 61, a micro switch adapter plate 62, and a micro switch jack 63. The microswitch carrier bar may comprise a first trigger section, which may be arranged above the push rod 1, and a second trigger section, which may be arranged above the microswitch. When the push rod 1 moves upwards and enables the movable contact 30 to be engaged with the fixed contacts 11 and 12, the push rod 1 can drive the first triggering section, and then drive the second triggering section to trigger the switch action of the micro switch. The micro switch adapter plate is provided with a feedback circuit, and the feedback circuit can feed back the current switch state of the micro switch. Thus, the current operating state (e.g., moving contact engaged state or disengaged state) of the dc contactor 100 can be advantageously signaled by a microswitch-based feedback mechanism, which can timely monitor the operating failure of the dc contactor 100.

Next, an arc extinguishing scheme of the dc contactor 100 according to some embodiments of the present application will be described in further detail with reference to the accompanying drawings.

As shown in fig. 2-5, the dc contactor 100 of the present application employs a magnetic blow-out scheme. The dc contactor 100 may include a first magnet 21 and a second magnet 22 for magnetic quenching. Instead of arranging the first magnet 21 and the second magnet 22 outside the first stationary contact 11 and the second stationary contact 12, respectively, in the magnetic quenching scheme of the present application, the first magnet 21 may be positioned with respect to the first stationary contact 11 such that the first magnet 21 is arranged at least partially directly below the first end surface area 111 of the lower end portion 13 of the first stationary contact 11, and the second magnet 22 may be positioned with respect to the second stationary contact 12 such that the second magnet 22 is arranged at least partially directly below the first end surface area 111 of the lower end portion 13 of the second stationary contact 12.

In the present application, "directly below" is understood as: the first magnet 21 and the first stationary contact 11 may be aligned in the vertical direction F instead of being sideways, and the second magnet 22 and the second stationary contact 12 may be aligned in the vertical direction F instead of being sideways. That is, the first magnet 21 overlaps with the projection, i.e., orthographic projection, of the first end surface region 111 of the lower end portion 13 of the first stationary contact 11 in the vertical direction F, and the second magnet 22 overlaps with the projection, i.e., orthographic projection, of the first end surface region 111 of the lower end portion 13 of the second stationary contact 12 in the first direction.

Furthermore, in order to avoid the influence on the stationary-movable-contact engagement, it is advantageous that the projection of the first magnet 21 in the first direction does not overlap with the projection of the second end surface region 112 as the contact surface of the lower end portion 13 of the first stationary contact 11, and that the projection of the second magnet 22 in the first direction does not overlap with the projection of the second end surface region 112 as the contact surface of the lower end portion 13 of the second stationary contact 12. That is, the first magnet 21 is located beside the second end surface area 112 as the contact surface of the first stationary contact 11, and the second magnet 22 is located beside the second end surface area 112 as the contact surface of the second stationary contact 12.

In some embodiments, at least sixty percent of the projection of the first magnet 21 in the first direction falls within the projection of the first end face region 111 of the lower end 13 of the first stationary contact 11 in the first direction; and the projection of the second magnet 22 in the first direction falls within at least sixty percent of the projection of the first end face region 111 of the lower end 13 of the second stationary contact 12 in the first direction.

In some embodiments, at least eighty percent of the projection of the first magnet 21 in the first direction falls within the projection of the first end face region 111 of the lower end 13 of the first stationary contact 11 in the first direction; and the projection of the second magnet 22 in the first direction falls within at least eighty percent of the projection of the first end face region 111 of the lower end portion 13 of the second stationary contact 12 in the first direction.

In some embodiments, the projection of the first magnet 21 in the first direction falls substantially entirely within the projection of the first end face region 111 of the lower end 13 of the first stationary contact 11 in the first direction; and the projection of the second magnet 22 in the first direction falls substantially completely within the projection of the first end surface area 111 of the lower end 13 of the second stationary contact 12 in the first direction.

In the magnetic quenching scheme of the application, the distance between the first magnet 21 and the second magnet 22 is advantageously shortened because the magnets 21, 22 are no longer arranged beside the corresponding stationary contacts 11, 12. The shortened distance between the first magnet 21 and the second magnet 22 is advantageous for improving the magnetic field strength between the magnets, which further improves the magnetic blowout effect. The respective magnet 21, 22 can be arranged next to the second end face region 112 of the stationary contact 11, 12 as contact face, so as to be closer to the arc formation point, the shortened distance from the arc formation point, i.e. the contact face, being advantageous for the magnetic quenching effect. Unexpectedly, the improvement of the arc breaking capacity of the direct current contactor can be significantly improved by shortening the distance between the first magnet 21 and the second magnet 22. Further, such an arrangement may advantageously be obtained by a simple retrofit or a simple manufacturing process, which is certainly advantageous for manufacturing costs. In addition, the shortened spacing between magnets facilitates a compact construction of dc contactor 100. Advantageously, in some embodiments, the dc contactor 100 may have only a single pair of magnetic blowout magnets formed by the first and second magnets 21, 22, which is quite advantageous for both cost savings and compactness of the structure.

Referring to fig. 8 and 9, schematic diagrams of the arc suppressing effect of the dc contactor 100 in a first operating state (first contact polarity connection) and a second operating state (second contact polarity connection), respectively, are shown. In order to realize a non-polar dc contactor, the magnetic faces of the first magnet 21 and the second magnet 22 are oriented towards each other, for example, the N-pole face of the first magnet 21 faces the S-pole face of the second magnet 22 or the S-pole face of the first magnet 21 faces the N-pole face of the second magnet 22, and the magnetic field H is indicated by an arrow. As can be appreciated by reference to the lorentz force F to which the charged particles are subjected in a magnetic field: when the polarity of the contacts changes, good magnetic blowout effect can be realized, and the electric arc between the first fixed contact 11 and the second fixed contact 12 does not have the risk of short circuit. Therefore, the static contact is not limited by polarity any more, the damage caused by reverse connection of the static contact is avoided, and the installation is simpler. With continued reference to fig. 8 and 9, four arc extinguishing units may be configured within the arc extinguishing chamber 40, which may be respectively at four corners of the arc extinguishing chamber 40. Advantageously, the four arc extinguishing units can be designed substantially identically to one another, whereby a symmetrical arc extinguishing unit group is formed.

In order to further improve the magnetic induction of the magnetic blowout and thus the arc breaking capacity of the contactor, the respective stationary contact 11, 12 of the dc contactor 100 according to a further improved embodiment of the present application may be provided with a respective recess 15 or a recess area, as shown in fig. 6, the lower end 13 of the stationary contact 11, 12 of the dc contactor 100 may be provided with a respective recess 15 or a recess area in the region of the first end area 111. In the embodiment of fig. 6, the lower ends 13 of the stationary contacts 11, 12 may be configured as L-shaped stepped lower ends. It should be understood that the form of the hollow 15 may be various, and thus the configuration of the lower end portion 13 of the stationary contact may be various, and is not limited to the current embodiment.

With continued reference to fig. 2 and 6, the lower end 13 of the first stationary contact 11 may be provided with a first void in the region of the first end face region 111, and the lower end 13 of the second stationary contact 12 may be provided with a second void in the region of the second end face region 112. By providing a recess in the region of the first end face region 111 or by removing material from the lower end 13 of the first stationary contact 11 in the region of the first end face region 111, the lower end 13 of the first stationary contact 11 no longer has a flat lower surface, but has a surface contour that is offset up and down. Specifically, the first end surface region 111 of the first stationary contact 11 may be above the second end surface region 112 as a contact surface, and the first end surface region 111 of the second stationary contact 12 may be above the second end surface region 112 as a contact surface. In some embodiments, the first end surface region 111 of the first stationary contact 11 may be lifted up a first distance relative to the second end surface region 112 as a contact surface, and the first end surface region 111 of the second stationary contact 12 may be lifted up a second distance relative to the second end surface region 112 as a contact surface. In some embodiments, the first distance and the second distance may be set within a range of values between 1 millimeter and 10 millimeters, 1 millimeter and 5 millimeters, respectively.

By providing the recess 15 on the lower end 13 of the respective stationary contact 11, 12, the respective magnet 21, 22 can be allowed to rise further in the vertical direction F in the region of the first end region 111, that is to say extend further into the recess 15 of the stationary contact 11, 12, so that the respective magnet (more precisely the upper surface of the magnet) can be arranged further at least partially above the second end region 112 of the lower end 13 of the respective stationary contact. In other words, the respective magnet can be further lifted with respect to the second end surface region 112 as the contact surface, so that the contact position between the moving contact 30 and the stationary contact, i.e., the arc formation position, is further close to the magnet intermediate position. The closer to the magnet intermediate position, the more the magnetic field strength for magnetic quenching will be enhanced, and thus the provision of the void portion allows further improvement of the magnetic quenching effect.

Advantageously, the arrangement of the recess of the stationary contact can be achieved by simple retrofitting or simple manufacturing processes. In addition, the shortened spacing between the magnets and the stationary contact facilitates a compact construction of the dc contactor 100.

In some embodiments, the upper surface of the first magnet 21 may be disposed at least partially above the second end surface region 112 of the lower end portion 13 of the first stationary contact 11 by a third distance; and the upper surface of the second magnet 22 is arranged at least partially above the second end surface region 112 of the lower end 13 of the second stationary contact 12 by a fourth distance, the third and fourth distances may advantageously be set in a numerical range between 0.5 and 5 and 1 and 3mm, respectively.

In some embodiments, the shape and/or size of the recess 15 of the stationary contact 11, 12 may be set reasonably taking into account the stationary contact thermal performance and the arc breaking capability of the dc contactor 100.

According to a further improved embodiment of the application, the respective magnet 21, 22 of the direct current contactor 100 may be provided with a respective recess 25 or hollowed-out area. As shown in fig. 7, the magnet may be formed with a recess on the upper side. In the embodiment of fig. 7, the longitudinal section of the respective magnet may form a square with a U-shaped recess. It should be understood that the form of the recess 25 may be varied, and thus the configuration of the magnet may be varied, and is not limited to the current embodiment. It should be understood that the magnets 21, 22 are not necessarily designed with a recess. In other embodiments, the corresponding magnets of the dc contactor 100 may be configured as square magnets without a recess.

By providing the recess 25 on the upper side of the magnet 21, 22 facing the respective stationary contact 11, 12, the respective magnet can be allowed to further lift in the vertical direction F towards the stationary contact. Advantageously, the recess of the respective magnet may be arranged at least partially directly below the first end surface region 111 of the stationary contact. Further advantageously, the recess 25 of the respective magnet 21, 22 may be arranged at least partially directly below the recess 15 of the stationary contact 11, 12. Thereby, the recess of the magnet and the recess of the stationary contact are close to each other, so that the recess of the magnet and the recess of the stationary contact at least partially coincide.

Accordingly, the corresponding magnet can be further lifted with respect to the second end surface region 112 as a contact surface, so that the contact position between the movable contact 30 and the stationary contact, i.e., the arc formation position, is further close to the magnet intermediate position. The closer to the magnet intermediate position, the more the magnetic field strength for magnetic quenching will be enhanced, and thus the provision of the void portion allows further improvement of the magnetic quenching effect. Furthermore, advantageously, the arrangement of the recess of the magnet can be obtained by simple retrofitting or simple manufacturing processes. In addition, the shortened spacing between the magnets and the stationary contact facilitates a compact construction of the dc contactor 100.

With continued reference to fig. 2 and 5, an assembly scheme of corresponding stationary contacts and corresponding magnets in the dc contactor 100 according to some embodiments of the present application will be described.

The lower end 13 of the first stationary contact 11 and the lower end 13 of the second stationary contact 12 may extend into the arc chute 40. A first opening 43 into which the second end surface region 112 of the lower end portion 13 of the first stationary contact 11 enters and a second opening 44 into which the second end surface region 112 of the lower end portion 13 of the second stationary contact 12 enters may be formed in the arc extinguishing chamber 40. That is, the second end surface region 112 of the lower end portion 13 of the first stationary contact 11 allows further guiding through the first opening 43 in the arc extinguishing chamber 40, and the second end surface region 112 of the lower end portion 13 of the second stationary contact 12 allows further guiding through the second opening 44 in the arc extinguishing chamber 40. Thereby, the second end surface area 112 of the lower end 13 of the corresponding stationary contact can approach the space where the moving contact 30 is located. Conversely, the first end face region 111 of the lower end 13 of the first stationary contact 11 may be seated against the first limit boss 41 formed by the wall of the arc chute 40 within the arc chute 40 without accessing the first opening 43, and the first end face region 111 of the lower end 13 of the second stationary contact 12 may be seated against the second limit boss 42 formed by the wall of the arc chute 40 within the arc chute 40 without accessing the second opening 44. That is, the first end face region 111 of the lower end 13 of the respective stationary contact is not allowed to be guided further through the opening in the arc chute 40. Thus, the first end surface area 111 of the lower end 13 of the corresponding stationary contact cannot access the space where the moving contact 30 is located.

Accordingly, the first magnet 21 may be rested on the first limit boss 41 outside the arc extinguishing chamber 40 such that the first magnet 21 and the first end surface area 111 of the lower end portion 13 of the first stationary contact 11 are respectively rested on both sides of the first limit boss 41 adjacent to each other; and the second magnet 22 may be rested on the second limiting boss 42 outside the arc extinguishing chamber 40 such that the second magnet 22 and the first end surface area 111 of the lower end portion 13 of the second stationary contact 12 are rested on both sides of the second limiting boss 42 adjacent to each other, respectively. The respective magnet can thus abut against the first end face region 111 of the stationary contact on both sides of the limit projection, so that a compact lifting arrangement of the magnet relative to the second end face region 112 is possible. Such a lifting arrangement may improve the magnetic quenching effect and may be obtained by simple retrofitting or simple manufacturing processes, which is undoubtedly advantageous in terms of manufacturing costs.

Although exemplary embodiments of the present application have been described, it will be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present application without departing from the spirit and scope of the application. Accordingly, all changes and modifications are intended to be included within the scope of the present application.

Claims (17)

1. A dc contactor, comprising:

The first fixed contact and the second fixed contact;

the movable contact can move towards the first fixed contact and the second fixed contact along a first direction, so that the contact surface of the movable contact is engaged with the contact surface of the first fixed contact and the contact surface of the second fixed contact, and the movable contact can move away from the first fixed contact and the second fixed contact along the first direction, so that the contact surface of the movable contact is disconnected with the contact surface of the first fixed contact and the contact surface of the second fixed contact; and

An arc extinguishing chamber, wherein the contact surface of the first static contact, the contact surface of the second static contact and the moving contact are arranged in the arc extinguishing chamber,

The direct current contactor is characterized in that the direct current contactor comprises a first magnet and a second magnet for magnetic quenching, the lower end part of the first static contact is provided with a first end surface area and a second end surface area which are contact surfaces, the lower end part of the second static contact is provided with a first end surface area and a second end surface area which are contact surfaces, wherein the first magnet is positioned relative to the first static contact, so that the first magnet is at least partially arranged right below the first end surface area of the lower end part of the first static contact, and the second magnet is positioned relative to the second static contact, so that the second magnet is at least partially arranged right below the first end surface area of the lower end part of the second static contact.

2. The direct current contactor according to claim 1, wherein,

The projection of the first magnet and the first end surface area of the lower end part of the first fixed contact in the first direction is overlapped, and the projection of the first magnet and the second end surface area of the lower end part of the first fixed contact in the first direction is not overlapped; and

The second magnet has an overlap with a projection of a first end surface area of a lower end portion of the second stationary contact in a first direction, and the second magnet has no overlap with a projection of a second end surface area of a lower end portion of the second stationary contact in the first direction.

3. A DC contactor as claimed in claim 2, wherein,

At least sixty percent of the projection of the first magnet in the first direction falls into the projection of a first end surface area of the lower end part of the first fixed contact in the first direction; and

At least sixty percent of the projection of the second magnet in the first direction falls into the projection of the first end surface area of the lower end part of the second fixed contact in the first direction.

4. A DC contactor as claimed in claim 3, wherein,

The projection of the first magnet in the first direction completely falls into the projection of the first end surface area of the lower end part of the first fixed contact in the first direction; and

The projection of the second magnet in the first direction completely falls into the projection of the first end surface area of the lower end part of the second fixed contact in the first direction.

5. A DC contactor as claimed in any one of claims 1 to 4, wherein,

The lower end part of the first fixed contact is provided with a first hollow part in the range of the first end surface area, so that the first end surface area of the first fixed contact is positioned above the second end surface area serving as a contact surface;

The lower end of the second fixed contact is provided with a second hollow part in the range of the second end surface area, so that the first end surface area of the second fixed contact is positioned above the second end surface area serving as a contact surface.

6. The DC contactor as claimed in claim 5, wherein,

The first end surface area of the first static contact is lifted up to a first distance relative to the second end surface area as a contact surface, and

The first end surface area of the second stationary contact is lifted up to a second distance relative to the second end surface area as a contact surface,

Wherein the first distance and the second distance are each set in a numerical range between 1mm and 10 mm.

7. The dc contactor as claimed in claim 5, wherein the first magnet extends into a first recess of the first stationary contact and the second magnet extends into a second recess of the second stationary contact.

8. The direct current contactor according to claim 5, wherein the lower end portion of the first stationary contact and the lower end portion of the second stationary contact are respectively configured as L-shaped stepped lower end portions.

9. The direct current contactor according to claim 5, wherein the first magnet is positioned relative to the first stationary contact such that an upper surface of the first magnet is at least partially disposed above a second end surface area of a lower end portion of the first stationary contact, and the second magnet is positioned relative to the second stationary contact such that an upper surface of the second magnet is at least partially disposed above a second end surface area of a lower end portion of the second stationary contact.

10. The direct current contactor according to claim 9, wherein,

The upper surface of the first magnet is at least partially disposed a third distance above the second end face region of the lower end of the first stationary contact; and

The upper surface of the second magnet is arranged at least partially above the second end surface area of the lower end of the second stationary contact by a fourth distance,

Wherein the third distance and the fourth distance are respectively set in a numerical range between 0.5mm and 5mm.

11. The DC contactor as claimed in claim 5, wherein,

The first magnet comprises a third hollow part facing the first fixed contact; and

The second magnet comprises a fourth hollow part facing the second fixed contact;

Wherein the third recess is arranged at least partially directly below the first recess and the fourth recess is arranged at least partially directly below the second recess.

12. The direct current contactor according to claim 11, wherein,

The first and third hollow portions are adjacent to each other such that the first and third hollow portions at least partially coincide; and

The second and fourth open portions are proximate to each other such that the second and fourth open portions at least partially coincide.

13. The direct current contactor according to claim 11, wherein,

The third cutout of the first magnet is configured such that a longitudinal section of the first magnet forms a square with a U-shaped recess; and

The fourth recess of the second magnet is configured such that a longitudinal section of the second magnet forms a square with a U-shaped recess.

14. The direct current contactor according to claim 5, wherein the arc extinguishing chamber is provided with a first opening into which the second end surface area of the lower end portion of the first stationary contact is entered and a second opening into which the second end surface area of the lower end portion of the second stationary contact is entered, wherein the first end surface area of the lower end portion of the first stationary contact is placed against a first limit boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber without entering the first opening, and the first end surface area of the lower end portion of the second stationary contact is placed against a second limit boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber without entering the second opening.

15. The direct current contactor according to claim 14, wherein,

The first magnet is leaned against the first limiting boss outside the arc extinguishing chamber, so that the first magnet and the first end surface area of the lower end part of the first static contact are respectively leaned against two sides of the first limiting boss adjacent to each other; and

The second magnet is leaned against the second limiting boss outside the arc extinguishing chamber, so that the second magnet and the first end surface area of the lower end part of the second static contact are respectively leaned against two sides of the second limiting boss adjacent to each other.

16. A DC contactor as claimed in any one of claims 1 to 4, wherein,

The direct current contactor only has a single pair of magnetic blowout magnet pairs formed by the first magnet and the second magnet; and/or

The first and second magnets are arranged such that the dc contactor forms a non-polar dc contactor; and/or

The direct current contactor comprises a driving assembly, wherein the driving assembly is configured to drive the moving contact to move in the arc extinguishing chamber; and/or

Four arc extinguishing units are formed in the arc extinguishing chamber, are respectively positioned at four corners of the arc extinguishing chamber and are designed in the same way.

17. Electrical device, characterized in that it comprises a first conductor, a second conductor and a direct current contactor according to one of claims 1 to 16, the first conductor being in conductive connection with a first stationary contact of the direct current contactor and the second conductor being in conductive connection with a second stationary contact of the direct current contactor.