DC contactor and electrical equipment
The enhanced magnetic arrangement in the straight current contactor effectively addresses the challenge of arc suppression in high-voltage applications, improving performance and lifespan by increasing magnetic field strength within the contactor's arc suppression chamber.
Patent Information
- Application Number
- CN202311276728.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-28
- Publication Date
- 2025-03-28
AI Technical Summary
Existing straight current contactors face challenges in effectively breaking electrical arcs due to insufficient magnetic force in existing arc suppression methods, leading to reduced performance and lifespan, particularly under high voltage conditions, and require a cost-effective, compact, and simple arc suppression solution.
The design incorporates a straight current contactor with a unique magnetic arrangement where two magnets are positioned relative to the static and dynamic contactors to enhance magnetic field strength within the arc suppression chamber, allowing for improved arc disruption and utilizing a compact structure.
This configuration significantly enhances the contactor's arc disruption capability, improving performance and lifespan while maintaining cost-effectiveness and structural compactness.
Smart Images
Figure CN119725034A_ABST
Abstract
Description
Technical Field
[0001] The present application generally relates to the field of contactors, and more specifically, to a DC contactor, especially a non-polarity DC contactor. In addition, the present application relates to an electrical device equipped with the DC contactor. Background Art
[0002] As a high-power switching device, contactors are widely used in power, power distribution and power consumption. Contactors can not only connect and disconnect circuits, but also have low-voltage release protection. Contactors can be used as electronic control devices in automatic control circuits. They are actually an "automatic switch" that uses a smaller current to control a larger current.
[0003] In recent years, with the development of new energy electric vehicles, charging piles and energy storage batteries, the application of high-voltage DC contactors has become more and more common, and has become an essential electrical component for controlling the on and off of circuits in electric vehicles and charging piles.
[0004] DC contactor is a type of contactor. Most of the existing DC contactors adopt the dynamic reed direct-acting type (also known as solenoid direct-acting) solution. The principle is that it is driven by a coil and generates electromagnetic force through a magnetic circuit of a certain shape surrounding it, providing initial kinetic energy for the moving and static contacts to be connected.
[0005] However, the DC contactor will generate arcs during the connection and disconnection process, which will cause great damage to the DC contactor and affect the electrical life of the DC contactor. In addition, the higher the load voltage connected, the harder it is to break the arc, which will cause the moving and static contacts to not be completely separated in time. The arc breaking capacity of the contactor is an important criterion for measuring the performance of the contactor.
[0006] The commonly used arc extinguishing method in the industry is "magnetic blow-out arc extinguishing". Charged particles are affected by the Lorentz magnetic force in the magnetic field, which makes the arc elongated to achieve the arc extinguishing effect. However, the magnetic strength of the currently known "magnetic blow-out arc extinguishing" is often not strong enough, and the arc extinguishing effect is not good. Therefore, it is desired to further improve the arc breaking capacity of the contactor.
[0007] In addition, due to the limitation of manufacturing cost and / or installation space, it is also desired to realize a cost-effective, simple to manufacture and / or compact arc extinguishing solution for the DC contactor. Summary of the invention
[0008] Therefore, the purpose of the present application is to provide a DC contactor, especially a non-polar DC contactor, which can overcome at least one defect in the prior art, and by means of the DC contactor, the arc breaking capacity of the contactor can be further improved. In addition, the DC contactor according to some embodiments of the present application can also realize a cost-effective, simple to manufacture and / or compact arc extinguishing solution. In addition, the purpose of the present application is to provide an electrical device equipped with the DC contactor.
[0009] According to a first aspect of the present application, a DC contactor is provided, comprising: a first stationary contact and a second stationary contact; a moving contact, wherein the moving contact can move along a first direction toward the first stationary contact and the second stationary contact so that the contact surface of the moving contact engages with the contact surface of the first stationary contact and the contact surface of the second stationary contact, and the moving contact can move along a first direction away from the first stationary contact and the second stationary contact so that the contact surface of the moving contact is disconnected from the contact surface of the first stationary contact and the contact surface of the second stationary contact; and an arc extinguishing chamber, wherein the contact surface of the first stationary contact, the contact surface of the second stationary contact and the moving contact are arranged in the arc extinguishing chamber. The arc chamber is characterized in that the DC contactor includes a first magnet and a second magnet for magnetically blowing out the arc, the lower end of the first static contact has a first end face area and a second end face area as a contact surface, and the lower end of the second static contact has a first end face area and a second end face area as a contact surface, wherein the first magnet is positioned relative to the first static contact so that the first magnet is at least partially arranged directly below the first end face area of the lower end 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 directly below the first end face area of the lower end of the second static contact.
[0010] In some embodiments, the first magnet overlaps with the projection of the first end face area of the lower end portion of the first static contact in the first direction, while the first magnet does not overlap with the projection of the second end face area of the lower end portion of the first static contact in the first direction; and the second magnet overlaps with the projection of the first end face area of the lower end portion of the second static contact in the first direction, while the second magnet does not overlap with the projection of the second end face area of the lower end portion of the second static contact in the first direction.
[0011] In some embodiments, at least sixty percent of the projection of the first magnet in the first direction falls within the projection of the first end surface area of the lower end of the first stationary contact in the first direction; and at least sixty percent of the projection of the second magnet in the first direction falls within the projection of the first end surface area of the lower end of the second stationary contact in the first direction.
[0012] In some embodiments, at least eighty percent of the projection of the first magnet in the first direction falls within the projection of the first end surface area of the lower end of the first stationary contact in the first direction; and at least eighty percent of the projection of the second magnet in the first direction falls within the projection of the first end surface area of the lower end of the second stationary contact in the first direction.
[0013] In some embodiments, the projection of the first magnet in the first direction completely falls within the projection of the first end surface area 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 within the projection of the first end surface area of the lower end of the second stationary contact in the first direction.
[0014] In some embodiments, the lower end portion of the first stationary contact is provided with a first recessed portion within the range of the first end face area, so that the first end face area of the first stationary contact is above the second end face area serving as the contact surface; the lower end portion of the second stationary contact is provided with a second recessed portion within the range of the second end face area, so that the first end face area of the second stationary contact is above the second end face area serving as the contact surface.
[0015] In some embodiments, the first end surface area of the first stationary contact is lifted upward by a first distance relative to the second end surface area as the contact surface, and the first end surface area of the second stationary contact is lifted upward by a second distance relative to the second end surface area as the contact surface.
[0016] In some embodiments, the first distance and the second distance are respectively set within a numerical range between 1 mm and 5 mm or 10 mm.
[0017] 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.
[0018] In some embodiments, 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 ends.
[0019] In some embodiments, the first magnet is positioned relative to the first stationary contact so that an upper surface of the first magnet is at least partially arranged 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 so that an upper surface of the second magnet is at least partially arranged above a second end surface area of a lower end portion of the second stationary contact.
[0020] In some embodiments, the upper surface of the first magnet is at least partially arranged above the second end surface area of the lower end of the first stationary contact by a third distance; and the upper surface of the second magnet is at least partially arranged above the second end surface area of the lower end of the second stationary contact by a fourth distance.
[0021] In some embodiments, the third distance and the fourth distance are respectively set within a numerical range between 0.5 mm and 2 mm or 5 mm.
[0022] In some embodiments, the first magnet includes a third recessed portion facing the first stationary contact; and the second magnet includes a fourth recessed portion facing the second stationary contact; wherein the third recessed portion is at least partially arranged directly below the first recessed portion, and the fourth recessed portion is at least partially arranged directly below the second recessed portion.
[0023] In some embodiments, the first gap portion and the third gap portion are close to each other so that the first gap portion and the third gap portion at least partially overlap; and the second gap portion and the fourth gap portion are close to each other so that the second gap portion and the fourth gap portion at least partially overlap.
[0024] In some embodiments, the third recess of the first magnet is configured so that the longitudinal section of the first magnet forms a square with a U-shaped recess; and the fourth recess of the second magnet is configured so that the longitudinal section of the second magnet forms a square with a U-shaped recess.
[0025] In some embodiments, the arc extinguishing chamber is provided with a first opening for entry of a second end face region of a lower end portion of a first static contact and a second opening for entry of a second end face region of a lower end portion of a second static contact, wherein the first end face region of the lower end portion of the first static contact is resting on a first limiting boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber and cannot enter the first opening, and the first end face region of the lower end portion of the second static contact is resting on a second limiting boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber and cannot enter the second opening.
[0026] In some embodiments, the first magnet is placed 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 of the first static contact are respectively adjacent to each other on both sides of the first limiting boss; and the second magnet is placed 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 of the second static contact are respectively adjacent to each other on both sides of the second limiting boss.
[0027] In some embodiments, the DC contactor has only a single pair of magnetic blow-out magnets formed by the first magnet and the second magnet.
[0028] In some embodiments, the first magnet and the second magnet are arranged such that the DC contactor forms a non-polarity DC contactor.
[0029] In some embodiments, the DC contactor includes a driving assembly configured to drive the moving contact to move within the arc extinguishing chamber.
[0030] In some embodiments, four arc quenching units are configured in the arc quenching chamber. The four arc quenching units are respectively located at four corners of the arc quenching chamber and are designed identically to one another.
[0031] According to a second aspect of the present 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 present application, wherein the first conductor is conductively connected to a first static contact of the DC contactor, and the second conductor is conductively connected to a second static contact of the DC contactor. The DC contactor according to some embodiments of the present application can be applied to an electrical device, such as an electric vehicle, a charging device or a charging pile. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] The present application will be described in more detail below with reference to the accompanying drawings and by means of specific embodiments. The schematic drawings are briefly described as follows:
[0033] Figure 1 A top view of a DC contactor according to some embodiments of the present application is shown;
[0034] Figure 2 Shows Figure 1 A cross-sectional view of a DC contactor taken along line AA;
[0035] Figure 3 Shows Figure 1 A cross-sectional view of a DC contactor taken along line BB;
[0036] Figure 4 Shows Figure 1 A partial perspective view of a DC contactor of FIG. 1 , wherein an arc extinguishing chamber of the DC contactor is shown;
[0037] Figure 5 Shows Figure 1 A partial cross-sectional view of a DC contactor, showing an arc extinguishing chamber of the DC contactor;
[0038] Figure 6 Shows Figure 1 Schematic diagram of the static contact of the DC contactor;
[0039] Figure 7 Shows Figure 1 Schematic diagram of the magnet of the DC contactor;
[0040] Figure 8 A schematic diagram showing the arc extinguishing effect of the DC contactor in the first operating state is shown;
[0041] Fig. 9 A schematic diagram of the arc extinguishing effect of the DC contactor in the second operating state is shown. DETAILED DESCRIPTION
[0042] The present application will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present application. However, it should be understood that the present application can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present application more complete and fully explain the scope of protection of the present 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 more additional embodiments.
[0043] It should be understood that the terms used herein are only used to describe specific embodiments and are not intended to limit the scope of the present application. All terms (including technical terms and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, well-known functions or structures may not be described in detail.
[0044] As used herein, spatial relational terms such as "upper," "lower," "left," "right," "front," "rear," "higher," "lower," etc. may describe the relationship of one feature to another feature in the accompanying drawings. It should be understood that the spatial relational terms encompass different orientations of the device in use or operation in addition to the orientation shown in the accompanying drawings. For example, features previously described as being "below" other features may now be described as being "above" the other features when the device in the accompanying drawings is turned over. The device may also be otherwise oriented (rotated 90 degrees or in other orientations), and the relative spatial relationships will be interpreted accordingly.
[0045] Herein, the term "A or B" includes "A and B" and "A or B" rather than exclusively including only "A" or only "B", unless specifically stated otherwise.
[0046] In this document, the terms "illustrative" or "exemplary" mean "used as an example, instance or illustration" rather than as a "model" to be exactly copied. Any implementation described exemplarily herein is not necessarily to be construed as preferred or advantageous over other implementations. Moreover, the present application is not limited by any stated or implied theory given in the above technical field, background technology, summary of the invention or detailed description.
[0047] As used herein, the term "substantially" is intended to include any minor variations due to design or manufacturing defects, tolerances of devices or components, environmental influences, and / or other factors.
[0048] In this document, the term "partially" may be any proportion of a portion, such as greater than 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or even 100%, i.e., all.
[0049] In addition, the terms "first", "second" and the like may also be used herein for reference purposes only, and thus are 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 the context clearly indicates otherwise.
[0050] Some embodiments of the present application will now be described in more detail with reference to the accompanying drawings.
[0051] like Figure 1-7 As shown, the DC 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 extinguishing chamber 40 may be surrounded by insulating arc extinguishing chamber walls 401, 402 (e.g., nylon plastic walls). The lower end portion 13 of the first stationary contact 11 and the lower end portion 13 of the second stationary contact 12 may extend into the arc extinguishing chamber 40, so that the contact surface of the first stationary contact 11 and the contact surface of the second stationary contact 12 may be maintained in the arc extinguishing chamber 40. It should be understood that the lower surface of the lower end portion 13 of the first stationary contact 11 may include a first end face area 111 that does not serve as a contact surface and a second end face area 112 that serves as a contact surface. Similarly, the lower surface of the lower end portion 13 of the second stationary contact 12 may include a first end face area 111 that does not serve as a contact surface and a second end face area 112 that serves as a contact surface, see Figure 6 .
[0052] A moving contact 30, for example, a moving contact in the form of a moving contact plate, is also arranged in the arc extinguishing chamber 40. The moving contact 30 can move toward the first stationary contact 11 and the second stationary contact 12 along a first direction, that is, a vertical direction F, so 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. In addition, the moving contact 30 can move away from the first stationary contact 11 and the second stationary contact 12 along the first direction, that is, the vertical direction F, so that the contact surface of the moving contact 30 is disconnected from the contact surface of the first stationary contact 11 and the contact surface of the second stationary contact 12.
[0053] In order to drive the moving contact 30 to move in the arc extinguishing chamber 40, the DC contactor 100 may include a driving component 29. Figure 2 and 3As shown, in the current 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 respectively engaged with the first static contact 11 and the second static contact 12. The magnetic control assembly may be arranged on a bracket 2, such as a bracket in the form of a steel cup, and the magnetic control assembly may include a coil assembly (including a coil skeleton 3 and a coil 4), a magnetic circuit assembly (such as a bearing 5, a magnetic sleeve 6, a moving iron core 7, etc.). In order to control the operation of the coil assembly, the DC contactor 100 may include a control circuit board 8 (such as a PCB circuit board). Through the control of the control circuit board 8, the coil assembly can generate an electromagnetic effect, and the moving iron core 7 can generate movement along the vertical direction F under the electromagnetic effect. The push rod 1 is engaged in the moving iron core 7 and can move with the moving iron core 7. The push rod 1 can further extend into the arc extinguishing chamber 40, prompting the moving contact 30 on the upper end of the push rod 1 to move forward along the vertical direction F. Advantageously, in order to maintain smooth and reliable movement, an additional travel spring 66 and / or a fastener 65 may be installed on the push rod 1, and the travel spring 66 may be used to reset the moving contact after the coil is powered off. Additionally or alternatively, a contact spring 64 may be installed for the moving contact 30, and the 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 caused by unexpected collisions between the moving contact 30 and the stationary contacts 11, 12.
[0054] It should be understood that the drive assembly for driving the moving contact 30 to move in the arc extinguishing chamber 40 can have a variety of variants and should not be limited to the current specific embodiment. For example, in some embodiments, the drive assembly can be driven by electric transmission, and the electric transmission scheme can be implemented with reference to the known schemes in the prior art. In some embodiments, the drive assembly can be driven by hydraulic transmission, and the hydraulic transmission scheme can be implemented with reference to the known schemes in the prior art. Since the specific drive scheme is not the core of the present invention, it will not be described here.
[0055] Additionally or alternatively, the DC contactor 100 may include a micro switch 61, a micro switch adapter plate 62 and a micro switch top rod 63. The micro switch top rod may include a first trigger section and a second trigger section, the first trigger section may be arranged above the push rod 1, and the second trigger section may be arranged above the micro switch. When the push rod 1 moves upward and causes the moving contact 30 to engage with the static contacts 11, 12, the push rod 1 may drive the first trigger section, thereby driving the second trigger section to trigger the switching action of the micro switch. A feedback circuit is provided on the micro switch adapter plate, and the feedback circuit may feedback the current switching state of the micro switch. Thus, the feedback mechanism based on the micro switch may advantageously use a signal to indicate the current operating state of the DC contactor 100 (for example, the engagement state or disconnection state of the moving and static contacts), which may timely monitor the operating faults of the DC contactor 100.
[0056] Next, the arc extinguishing solutions of the DC contactor 100 according to some embodiments of the present application are further described in detail with reference to the accompanying drawings.
[0057] like Figure 2-5 As shown, the DC contactor 100 of the present application adopts a magnetic blow-out arc solution. The DC contactor 100 may include a first magnet 21 and a second magnet 22 for magnetic blow-out arc. Instead of arranging the first magnet 21 and the second magnet 22 on the outside of the first static contact 11 and the second static contact 12 respectively, in the magnetic blow-out arc solution of the present application, the first magnet 21 can be positioned relative to the first static contact 11 so that the first magnet 21 is at least partially arranged directly below the first end surface area 111 of the lower end portion 13 of the first static contact 11, and the second magnet 22 can be positioned relative to the second static contact 12 so that the second magnet 22 is at least partially arranged directly below the first end surface area 111 of the lower end portion 13 of the second static contact 12.
[0058] In the present application, “directly below” should be understood as: the first magnet 21 and the first stationary contact 11 can be aligned in the vertical direction F instead of being on the side, and the second magnet 22 and the second stationary contact 12 can be aligned in the vertical direction F instead of being on the side. In other words, the first magnet 21 overlaps with the projection of the first end face area 111 of the lower end portion 13 of the first stationary contact 11 in the vertical direction F, that is, the orthographic projection, and the second magnet 22 overlaps with the projection of the first end face area 111 of the lower end portion 13 of the second stationary contact 12 in the first direction, that is, the orthographic projection.
[0059] In addition, in order to avoid the influence on the engagement of the static and movable contacts, it is advantageous that the projection of the first magnet 21 in the first direction with the second end face area 112 as the contact surface of the lower end portion 13 of the first static contact 11 does not overlap, and the projection of the second magnet 22 in the first direction with the second end face area 112 as the contact surface of the lower end portion 13 of the second static contact 12 does not overlap. In other words, the first magnet 21 is located beside the second end face area 112 as the contact surface of the first static contact 11, and the second magnet 22 is located beside the second end face area 112 as the contact surface of the second static contact 12.
[0060] 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 surface area 111 of the lower end portion 13 of the first stationary contact 11 in the first direction; and at least sixty percent of the projection of the second magnet 22 in the first direction falls within the projection of the first end surface area 111 of the lower end portion 13 of the second stationary contact 12 in the first direction.
[0061] 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 surface area 111 of the lower end portion 13 of the first stationary contact 11 in the first direction; and at least eighty percent of the projection of the second magnet 22 in the first direction falls within the projection of the first end surface area 111 of the lower end portion 13 of the second stationary contact 12 in the first direction.
[0062] In some embodiments, the projection of the first magnet 21 in the first direction basically completely falls within the projection of the first end face area 111 of the lower end portion 13 of the first stationary contact 11 in the first direction; and the projection of the second magnet 22 in the first direction basically completely falls within the projection of the first end face area 111 of the lower end portion 13 of the second stationary contact 12 in the first direction.
[0063] In the magnetic blow-out arc scheme of the present application, since the magnets 21 and 22 are no longer arranged beside the corresponding static contacts 11 and 12, the distance between the first magnet 21 and the second magnet 22 is advantageously shortened. The shortened distance between the first magnet 21 and the second magnet 22 is conducive to improving the magnetic field strength between the magnets, which further improves the magnetic blow-out arc effect. The corresponding magnets 21 and 22 can be arranged next to the second end face area 112 of the static contacts 11 and 12 as the contact surface, so as to be closer to the arc formation position, and the shortened distance with the arc formation position, that is, the contact surface of the contact is conducive to the magnetic blow-out arc effect. Unexpectedly, by shortening the distance between the first magnet 21 and the second magnet 22, the arc breaking capacity of the DC contactor can be significantly improved. Further, this arrangement can be advantageously obtained by simple modification or simple manufacturing process, which is undoubtedly advantageous for manufacturing cost. In addition, the shortened distance between the magnets is conducive to the compact structure of the DC contactor 100. Advantageously, in some embodiments, the DC contactor 100 may have only a single pair of magnetic blow-out magnets formed by the first magnet 21 and the second magnet 22 , which is quite beneficial for cost saving and compact structure.
[0064] Reference Figure 8 and 9 , schematic diagrams showing arc extinguishing effects of the DC contactor 100 in the first operating state (first contact polarity connected) and the second operating state (second contact polarity connected) are respectively shown. In order to realize a non-polar DC contactor, the opposite magnetic surfaces of the first magnet 21 and the second magnet 22 face each other, for example, the N-pole surface of the first magnet 21 faces the S-pole surface of the second magnet 22 or the S-pole surface of the first magnet 21 faces the N-pole surface of the second magnet 22, and the magnetic field H is shown by the arrow. With reference to the Lorentz magnetic force F exerted on the charged particles in the magnetic field, it can be recognized that when the polarity of the contacts changes, a good magnetic blowout arc extinguishing effect can be achieved, and there is no risk of short circuit in the arc between the first static contact 11 and the second static contact 12. Therefore, there is no longer any polarity restriction on the static contacts, which avoids the hazards caused by reverse connection of the static contacts and makes installation easier. Continue to refer to Figure 8 and 9 Four arc extinguishing units may be constructed in the arc extinguishing chamber 40, and the four arc extinguishing units may be respectively located at four corners of the arc extinguishing chamber 40. Advantageously, the four arc extinguishing units may be designed substantially identically to each other, thereby forming a symmetrical arc extinguishing unit group.
[0065] In order to further improve the magnetic induction intensity of the magnetic blow-out arc, and further improve the arc breaking capacity of the contactor, the corresponding static contacts 11, 12 of the DC contactor 100 according to the further improved embodiment of the present application can be provided with corresponding hollow portions 15 or hollowed-out areas, such as Figure 6As shown, the lower ends 13 of the fixed contacts 11, 12 of the DC contactor 100 may be provided with corresponding recesses 15 or hollowed-out areas within the first end face region 111. Figure 6 In the embodiment, the lower end 13 of the stationary contacts 11 and 12 can be configured as an L-shaped stepped lower end. It should be understood that the form of the blank portion 15 can be various, so the configuration of the lower end 13 of the stationary contact can be various and is not limited to the current embodiment.
[0066] Continue to refer to Figure 2 and Figure 6 , the lower end 13 of the first fixed contact 11 may be provided with a first recessed portion within the range of the first end face area 111, and the lower end 13 of the second fixed contact 12 may be provided with a second recessed portion within the range of the second end face area 112. By providing the recessed portion within the range of the first end face area 111 or by removing material from the lower end 13 of the first fixed contact 11 within the range of the first end face area 111, the lower end 13 of the first fixed contact 11 no longer has a flat lower surface, but has a surface contour that is staggered up and down. Specifically, the first end face area 111 of the first fixed contact 11 may be located above the second end face area 112 as a contact surface, and the first end face area 111 of the second fixed contact 12 may be located above the second end face area 112 as a contact surface. In some embodiments, the first end surface area 111 of the first static contact 11 can be lifted upward by a first distance relative to the second end surface area 112 as a contact surface, and the first end surface area 111 of the second static contact 12 can be lifted upward by a second distance relative to the second end surface area 112 as a contact surface. In some embodiments, the first distance and the second distance can be set in a numerical range of 1 mm to 10 mm and 1 mm to 5 mm, respectively.
[0067] By providing a cutout 15 on the lower end 13 of the corresponding stationary contact 11, 12, the corresponding magnet 21, 22 can be further lifted along the vertical direction F within the range of the first end face area 111, that is, further extended into the cutout 15 of the stationary contact 11, 12, so that the corresponding magnet (more precisely, the upper surface of the magnet) can be further at least partially arranged above the second end face area 112 of the lower end 13 of the corresponding stationary contact. In other words, the corresponding magnet can be further lifted relative to the second end face area 112 as the contact surface, so that the contact position between the moving contact 30 and the stationary contact, that is, the arc formation position, is further close to the middle position of the magnet. The closer to the middle position of the magnet, the stronger the magnetic field strength for magnetic arc blowing out will be, so the provision of the cutout allows the magnetic arc blowing out effect to be further improved.
[0068] Advantageously, the arrangement of the recess of the fixed contact can be achieved by simple modification or simple manufacturing process. In addition, the shortened distance between the magnet and the fixed contact is beneficial to the compact structure of the DC contactor 100 .
[0069] In some embodiments, the upper surface of the first magnet 21 can be at least partially arranged above the second end surface area 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 at least partially arranged above the second end surface area 112 of the lower end portion 13 of the second stationary contact 12 by a fourth distance. Advantageously, the third distance and the fourth distance can be set in a numerical range between 0.5 mm and 5 mm and 1 mm to 3 mm, respectively.
[0070] In some embodiments, the shape and / or size of the recess 15 of the fixed contacts 11 , 12 can be appropriately set in consideration of the thermal performance of the fixed contacts and the arc breaking capability of the DC contactor 100 .
[0071] According to a further improved embodiment of the present application, the corresponding magnets 21, 22 of the DC contactor 100 may be provided with corresponding recessed portions 25 or hollowed-out areas. Figure 7 As shown, the magnet can form a recess on the upper side. Figure 7 In the embodiment of the present invention, the longitudinal section of the corresponding magnet can form a square with a U-shaped recess. It should be understood that the form of the blank portion 25 can be various, so the configuration of the magnet can be various and is not limited to the current embodiment. It should be understood that the magnets 21 and 22 are not necessarily designed with blank portions. In other embodiments, the corresponding magnet of the DC contactor 100 can be configured as a square magnet without a blank portion.
[0072] By providing a cutout 25 on the upper side of the magnets 21, 22 facing the corresponding stationary contacts 11, 12, the corresponding magnets can be allowed to be further lifted toward the stationary contacts along the vertical direction F. Advantageously, the cutouts of the corresponding magnets can be at least partially arranged directly below the first end surface area 111 of the stationary contacts. Further advantageously, the cutouts 25 of the corresponding magnets 21, 22 can be at least partially arranged directly below the cutouts 15 of the stationary contacts 11, 12. As a result, the cutouts of the magnets and the cutouts of the stationary contacts are close to each other, so that the cutouts of the magnets and the cutouts of the stationary contacts at least partially overlap.
[0073] Therefore, the corresponding magnet can be further lifted relative to the second end face area 112 as the contact surface, so that the contact position between the moving contact 30 and the static contact, that is, the arc formation position, is further close to the middle position of the magnet. The closer to the middle position of the magnet, the stronger the magnetic field strength for magnetic arc blowing will be, so the setting of the blank portion allows the magnetic arc blowing effect to be further improved. In addition, advantageously, the setting of the blank portion of the magnet can be obtained by simple modification or simple manufacturing process. In addition, the shortened spacing between the magnet and the static contact is conducive to the compact structure of the DC contactor 100.
[0074] Continue to refer to Figure 2 and 5 , introduces the assembly scheme of the corresponding static contacts and the corresponding magnets in the DC contactor 100 according to some embodiments of the present application.
[0075] The lower end portion 13 of the first static contact 11 and the lower end portion 13 of the second static contact 12 may extend into the arc extinguishing chamber 40. A first opening 43 for the second end surface area 112 of the lower end portion 13 of the first static contact 11 to enter and a second opening 44 for the second end surface area 112 of the lower end portion 13 of the second static contact 12 to enter may be formed in the arc extinguishing chamber 40. That is, the second end surface area 112 of the lower end portion 13 of the first static contact 11 allows further guidance through the first opening 43 in the arc extinguishing chamber 40, and the second end surface area 112 of the lower end portion 13 of the second static contact 12 allows further guidance through the second opening 44 in the arc extinguishing chamber 40. Thus, the second end surface area 112 of the lower end portion 13 of the corresponding static contact can approach the space where the moving contact 30 is located. On the contrary, the first end surface area 111 of the lower end portion 13 of the first static contact 11 can be placed on the first limiting boss 41 formed by the wall of the arc extinguishing chamber 40 in the arc extinguishing chamber 40 and cannot enter the first opening 43, and the first end surface area 111 of the lower end portion 13 of the second static contact 12 is placed on the second limiting boss 42 formed by the wall of the arc extinguishing chamber 40 in the arc extinguishing chamber 40 and cannot enter the second opening 44. In other words, the first end surface area 111 of the lower end portion 13 of the corresponding static contact is not allowed to be further guided through the opening in the arc extinguishing chamber 40. As a result, the first end surface area 111 of the lower end portion 13 of the corresponding static contact cannot approach the space where the moving contact 30 is located.
[0076] Correspondingly, the first magnet 21 can be placed against the first limiting boss 41 outside the arc extinguishing chamber 40, so that the first magnet 21 and the first end face area 111 of the lower end portion 13 of the first static contact 11 are respectively placed adjacent to each other on both sides of the first limiting boss 41; and the second magnet 22 can be placed against the second limiting boss 42 outside the arc extinguishing chamber 40, so that the second magnet 22 and the first end face area 111 of the lower end portion 13 of the second static contact 12 are respectively placed adjacent to each other on both sides of the second limiting boss 42. As a result, the corresponding magnet can be closely attached to the first end face area 111 of the static contact on both sides of the limiting boss, thereby allowing the lifting arrangement of the magnet relative to the second end face area 112 to be realized in a compact manner. This lifting arrangement can improve the magnetic blowout arc extinguishing effect, and this lifting arrangement can be obtained by simple modification or simple manufacturing process, which is undoubtedly beneficial to manufacturing cost.
[0077] Although the exemplary embodiments of the present application have been described, it should 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 present application in essence. Therefore, all changes and modifications are included in the protection scope of the present application.
Claims
1. DC contactor, including: A first stationary contact and a second stationary contact; A moving contact, wherein the moving contact can move along a first direction toward the first stationary contact and the second stationary contact so that a contact surface of the moving contact engages with a contact surface of the first stationary contact and a contact surface of the second stationary contact, and the moving contact can move along the first direction away from the first stationary contact and the second stationary contact so that a contact surface of the moving contact is disconnected from a contact surface of the first stationary contact and a contact surface of the second stationary contact; and An arc extinguishing chamber, wherein a contact surface of a first stationary contact, a contact surface of a second stationary contact and a moving contact are arranged in the arc extinguishing chamber, It is characterized in that the DC contactor includes a first magnet and a second magnet for magnetic arc extinguishing, the lower end of the first static contact has a first end face area and a second end face area as a contact surface, and the lower end of the second static contact has a first end face area and a second end face area as a contact surface, wherein the first magnet is positioned relative to the first static contact so that the first magnet is at least partially arranged directly below the first end face area of the lower end 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 directly below the first end face area of the lower end of the second static contact.
2. The DC contactor according to claim 1, characterized in that: The projections of the first magnet and the first end surface area of the lower end of the first stationary contact in the first direction overlap, while the projections of the first magnet and the second end surface area of the lower end of the first stationary contact in the first direction do not overlap; and The second magnet overlaps with a projection of a first end surface area of a lower end portion of the second stationary contact in the first direction, while the second magnet does not 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. The DC contactor according to claim 2, characterized in that: At least 60 percent of the projection of the first magnet in the first direction falls within the projection of the first end surface area of the lower end of the first stationary contact in the first direction; and At least 60 percent of the projection of the second magnet in the first direction falls within the projection of the first end surface area of the lower end portion of the second stationary contact in the first direction.
4. The DC contactor according to claim 3, characterized in that: The projection of the first magnet in the first direction completely falls within the projection of the first end surface area 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 within the projection of the first end surface area of the lower end portion of the second stationary contact in the first direction.
5. The DC contactor according to any one of claims 1 to 4, characterized in that: A first recess is provided at the lower end of the first fixed contact within the range of the first end face region, so that the first end face region of the first fixed contact is located above the second end face region serving as the contact surface; The lower end of the second fixed contact is provided with a second recess in the region of the second end face region, so that the first end face region of the second fixed contact is located above the second end face region serving as a contact surface.
6. The DC contactor according to claim 5, characterized in that: The first end surface area of the first fixed contact is lifted upward by a first distance relative to the second end surface area as the contact surface, and The first end surface area of the second fixed contact is lifted upward by a second distance relative to the second end surface area as the contact surface. The first distance and the second distance are respectively set within a numerical range between 1 mm and 10 mm.
7. The DC contactor according to claim 5, characterized in that: 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 DC contactor according to claim 5, characterized in that: The lower end portion of the first fixed contact and the lower end portion of the second fixed contact are respectively configured as L-shaped stepped lower end portions.
9. The DC contactor according to claim 5, characterized in that: The first magnet is positioned relative to the first stationary contact so that an upper surface of the first magnet is at least partially arranged 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 so that an upper surface of the second magnet is at least partially arranged above a second end surface area of a lower end portion of the second stationary contact.
10. The DC contactor according to claim 9, characterized in that: The upper surface of the first magnet is arranged at least partially above the second end surface area of the lower end of the first stationary contact by a third distance; and The upper surface of the second magnet is at least partially arranged above the second end surface area of the lower end of the second stationary contact by a fourth distance, The third distance and the fourth distance are respectively set within a numerical range between 0.5 mm and 5 mm.
11. The DC contactor according to claim 5, characterized in that: The first magnet includes a third cutout portion facing the first stationary contact; and The second magnet includes a fourth recessed portion facing the second stationary contact; The third cutout is at least partially arranged directly below the first cutout, and the fourth cutout is at least partially arranged directly below the second cutout.
12. The DC contactor according to claim 11, characterized in that: The first gap portion and the third gap portion are close to each other, so that the first gap portion and the third gap portion at least partially overlap; and The second recessed portion and the fourth recessed portion are close to each other, so that the second recessed portion and the fourth recessed portion at least partially overlap.
13. The DC contactor according to claim 11, characterized in that: The third cutout of the first magnet is configured such that a longitudinal cross section of the first magnet forms a square with a U-shaped recess; and The fourth recess of the second magnet is designed such that a longitudinal cross section of the second magnet forms a square with a U-shaped recess.
14. The DC contactor according to claim 5, characterized in that: The arc extinguishing chamber is provided with a first opening for the second end face area of the lower end portion of the first static contact to enter, and a second opening for the second end face area of the lower end portion of the second static contact to enter, wherein the first end face area of the lower end portion of the first static contact is resting on a first limiting boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber and cannot enter the first opening, and the first end face area of the lower end portion of the second static contact is resting on a second limiting boss formed by the arc extinguishing chamber wall in the arc extinguishing chamber and cannot enter the second opening.
15. The DC contactor according to claim 14, characterized in that: The first magnet is placed 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 of the first static contact are placed adjacent to each other on both sides of the first limiting boss; and The second magnet is placed 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 of the second stationary contact are placed adjacent to each other on both sides of the second limiting boss.
16. The DC contactor according to any one of claims 1 to 4, characterized in that: The DC contactor has only one pair of magnetic blow-out magnets formed by the first magnet and the second magnet; and / or The first magnet and the second magnet are arranged so that the DC contactor forms a non-polarity DC contactor; and / or The DC 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 quenching units are formed in the quenching chamber, which are respectively located at four corners of the quenching chamber and are designed identically to one another.
17. Electrical equipment, characterized in that The electrical device comprises a first conductor, a second conductor and a DC contactor according to any one of claims 1 to 16, wherein the first conductor is electrically connected to a first stationary contact of the DC contactor, and the second conductor is electrically connected to a second stationary contact of the DC contactor.