A vehicle-mounted circuit breaker with pressure-loss protection

Abstract

The utility model provides a kind of vehicle-mounted circuit breaker of pressure loss protection belongs to circuit breaker technical field, it includes shell, static contact, moving contact, coil assembly, armature and moving plate, the coil assembly drives armature to move, the moving plate is slipped in shell and is connected with armature, the moving contact is located in moving plate middle, the static contact is fixed in shell, reset component is equipped between the moving plate and shell inner wall, the reset component includes outer sleeve, inner sleeve and compression spring, the outer sleeve is equipped with linkage inclined groove, the shell is slipped in isolation plate, the isolation plate is equipped with linkage inclined block matched with linkage inclined groove, isolation plate is inserted into contact interval when voltage loss breaking, and it is withdrawn when closing. The utility model realizes contact voltage loss breaking by inclined surface linkage, forms physical isolation in breaking position after contact voltage loss breaking, effectively improves the security and reliability under pressure loss condition.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted circuit breaker technology, specifically to a vehicle-mounted circuit breaker with undervoltage protection. Background Technology

[0002] On-board circuit breakers are critical protective devices in vehicle electrical systems used to connect, carry, and disconnect current under normal circuit conditions, and are widely used in the automotive industry. Unlike conventional molded case circuit breakers, on-board circuit breakers are generally small in size and typically consist of a housing, moving and stationary contacts, an electromagnetic drive mechanism, and a reset mechanism. Under normal energization, the electromagnetic mechanism engages, causing the moving and stationary contacts to close and conduct the circuit. In the event of a voltage loss or fault, the reset mechanism pushes the moving contact to disconnect, thereby ensuring the safety of vehicle electrical use.

[0003] However, existing vehicle-mounted circuit breakers pose safety hazards under under-voltage conditions. When a vehicle's power system experiences a sudden voltage drop or power outage due to a fault, the coil's magnetic field weakens or disappears, and the armature resets under the action of the return spring, separating the moving contact from the stationary contact. However, during this process, the arc generated between the moving and stationary contacts cannot be extinguished in time. Furthermore, the electrical clearance between the contacts after voltage loss is determined solely by the mechanical travel of the moving contact. If the return spring ages or becomes stuck, the contact breaking distance may be insufficient, potentially leading to continuous arcing, severely impacting the safety and reliability of the circuit breaker. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a vehicle-mounted circuit breaker with undervoltage protection.

[0005] The technical solution adopted by this utility model is as follows: This application provides a vehicle-mounted circuit breaker with undervoltage protection, including a housing, a stationary contact, a moving contact, a coil assembly, an armature, and a movable plate. The coil assembly is used to drive the armature to move. The movable plate is slidably disposed within the housing and connected to the armature. The moving contact is disposed in the middle of the movable plate. The stationary contact is fixed within the housing and located on the moving path of the moving contact. Reset components are provided on both sides of the movable plate facing the stationary contact and between the movable plate and the inner wall of the housing. The reset components include an outer sleeve disposed on the movable plate and an inner sleeve disposed on the inner wall of the housing. A compression spring abuts between the two. A linkage groove is provided on the outer sleeve facing the moving contact. Isolation plates are slidably provided on both the left and right sides of the housing towards the opening and closing position of the moving and stationary contacts. The end of the linkage groove near the stationary contact is inclined towards the stationary contact. A linkage block is provided at one end of the isolation plate to slide and cooperate with the linkage groove. When the coil assembly loses pressure and the moving and stationary contacts separate, the two isolation plates extend into the opening and closing position of the moving and stationary contacts. When the moving and stationary contacts close, the two isolation plates retract from the opening and closing position of the moving and stationary contacts.

[0006] In some embodiments, the cross-sections of the linkage groove and the linkage block are T-shaped and compatible.

[0007] In some embodiments, a fixed seat extends inwardly from the housing, the inner sleeve is disposed on the fixed seat, the fixed seat is provided with a threaded hole, an embedded adjusting bolt is disposed in the threaded hole, and one end of the compression spring abuts against the end of the adjusting bolt.

[0008] In some embodiments, a moving contact conductive sheet and a stationary contact conductive sheet are embedded in the housing. The moving contact conductive sheet is connected to the moving contact via a flexible wire, and the stationary contact conductive sheet is electrically connected to the stationary contact.

[0009] In some embodiments, the moving contact conductive sheet and the stationary contact conductive sheet have a terminal block extending outward from the same side of the housing.

[0010] In some embodiments, a guide shaft portion is provided inside the housing along the moving direction of the movable plate, and guide groove portions that slide and cooperate with the guide shaft portion are respectively provided on both sides of the movable plate.

[0011] In some embodiments, the inner wall of the housing is provided with two guide plates facing the position where the moving contact and the stationary contact are separated, the two guide plates form a guide groove, and the isolation plate is slidably disposed along the guide groove.

[0012] In some embodiments, arc-extinguishing plates are provided on both the upper and lower sides of the isolation plate near the moving contact inside the housing. Each arc-extinguishing plate includes a fixed plate portion connected to the housing and an arc-shaped portion coaxially disposed on the outer ring of the moving contact and the stationary contact. The arc-shaped portion has a plurality of openings evenly distributed circumferentially.

[0013] In some embodiments, a viewing window is provided on the housing corresponding to the opening and closing positions of the moving contact and the stationary contact.

[0014] In some embodiments, the outer wall of the housing is provided with grooves on the opposite side of the viewing window and on the left and right sides, and an elastic pad is provided in the groove.

[0015] The beneficial effects of this utility model are as follows: By setting a linkage inclined groove on the outer sleeve and sliding an isolation plate inside the housing, the linkage inclined block at the end of the isolation plate cooperates with the linkage inclined groove, so that when the moving contact and the stationary contact separate, the isolation plate automatically extends into the separation position between them, forming a physical isolation barrier and improving the safety during undervoltage disconnection. At the same time, the compression spring in the reset assembly provides a stable reset force when pressure is lost, ensuring reliable separation of the moving contact. The isolation plate intervenes synchronously, realizing the linkage between undervoltage protection and electrical isolation. The structure is compact and the operation is reliable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0017] Figure 1 This is a schematic diagram of a vehicle-mounted circuit breaker with undervoltage protection according to the present invention; Figure 2 This is a schematic diagram of a vehicle-mounted circuit breaker under pressure protection tripping during underpressure protection according to this utility model. Figure 3 This is a schematic diagram of a vehicle-mounted circuit breaker with undervoltage protection in this utility model when closed; Figure 4 This is a partial schematic diagram of a vehicle-mounted circuit breaker with undervoltage protection according to the present invention; Figure 5 This is a schematic diagram of the arc-extinguishing plate in this utility model; In the figure, 1-housing, 11-fixed base, 12-adjusting bolt, 13-guide shaft, 14-guide plate, 15-viewing window, 16-elastic pad, 2-stationary contact, 3-moving contact, 31-connecting plate, 4-coil assembly, 5-armature, 6-moving plate, 7-reset assembly, 71-outer sleeve, 72-inner sleeve, 73-compression spring, 74-linkage inclined groove, 8-isolation plate, 81-linkage inclined block, 82-second chamfer, 9-arc extinguishing plate, 91-fixed plate, 92-arc-shaped part, 93-opening, 10-first chamfer. Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present the relevant concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of this application.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] Existing vehicle-mounted circuit breakers suffer from problems such as low arc extinguishing efficiency and insufficient contact breaking distance due to aging and jamming of reset components during undervoltage breaking, making it difficult to ensure the safety and reliability of vehicle-mounted power supply.

[0026] Based on the above issues, such as Figures 1 to 5As shown, this utility model proposes a vehicle-mounted circuit breaker with undervoltage protection, including a housing 1, a stationary contact 2, a moving contact 3, a coil assembly 4, an armature 5, and a movable plate 6. The coil assembly 4 is fixedly installed at one end of the inner cavity of the housing 1, and can generate a magnetic field to drive the armature 5 to move axially after being energized. The movable plate 6 is slidably disposed in the housing 1 along the opening and closing direction of the moving and stationary contacts, and one end of it is fixedly connected to the armature 5, and can reciprocate synchronously with the armature 5. The moving contact 3 is fixedly disposed at the middle position of the movable plate 6 facing the stationary contact 2. The stationary contact 2 is fixedly installed on the inner wall of the housing 1 and is located on the moving path of the moving contact 3, and can make close contact with the moving contact 3 to realize circuit conduction.

[0027] A reset assembly 7 is provided on both sides of the movable plate 6 facing the stationary contact 2 and between the movable plate 6 and the inner wall of the housing 1. The reset assembly 7 includes an outer sleeve 71, an inner sleeve 72, and a compression spring 73. The outer sleeve 71 is fixedly disposed on the side end face of the movable plate 6, and the inner sleeve 72 is correspondingly fixedly disposed on the inner wall of the housing 1. The two ends of the compression spring 73 abut against the inner cavities of the outer sleeve 71 and the inner sleeve 72, respectively. When the coil assembly 4 loses pressure and the magnetic field disappears, the spring releases elastic potential energy to push the movable plate 6 to reset, so that the moving contact 3 and the stationary contact 2 can be quickly separated, thereby breaking the circuit. At the same time, the outer sleeve 71 and the inner sleeve 72 can effectively protect the compression spring 73.

[0028] A linkage groove 74 is provided on the side of the outer sleeve 71 facing the moving contact 3. For example, a linkage sleeve is fitted onto the outer wall of the outer sleeve 71, and the linkage groove 74 is disposed on the linkage sleeve. The end of the linkage groove 74 near the stationary contact 2 is inclined towards the stationary contact 2. Isolation plates 8 are slidably disposed on both the left and right sides of the inner cavity of the housing 1. The sliding direction of the isolation plates 8 is perpendicular to the moving direction of the moving plate 6 and extends towards the separation position of the moving contact 3 and the stationary contact 2. A linkage inclined block 81 is provided at the end of the isolation plate 8 near the outer sleeve 71. The linkage inclined block 81 is embedded in the linkage groove 74 and can slide along the groove of the linkage groove 74. The isolation plate 8 is made of insulating material.

[0029] When the coil assembly 4 is energized and attracts the armature 5, the moving plate 6 drives the moving contact 3 to move towards the stationary contact 2. The outer sleeve 71 moves forward synchronously with the moving plate 6. The inclined surface of the linkage groove 74 pushes the linkage block 81 to slide outward, thereby driving the two isolation plates 8 to simultaneously exit the joint position of the moving contact 3 and the stationary contact 2, avoiding the closed path of the contact. When the coil assembly 4 loses voltage and is de-energized, the compression spring 73 pushes the moving plate 6 to move away from the stationary contact 2. The outer sleeve 71 moves backward synchronously with the moving plate 6. The inclined surface of the linkage groove 74 drives the linkage block 81 to slide inward, so that the two isolation plates 8 simultaneously extend into the joint position of the moving contact 3 and the stationary contact 2, forming a physical insulation separation between the moving and stationary contacts.

[0030] With this configuration, the inclined plane linkage structure eliminates the need for additional drive components. The action of the isolation plate 8 is synchronized with the opening and closing of the contacts, resulting in high transmission efficiency and fast response speed. After the circuit breaker is disconnected due to pressure loss, the isolation plate 8 can effectively increase the equivalent electrical clearance between the moving and stationary contacts. Even if the spring 73 experiences fatigue aging or slight jamming, causing insufficient travel of the moving contact 3, the circuit breaker can still block the continuous arcing path through physical separation, thereby enhancing the safety performance of the circuit breaker under pressure loss conditions.

[0031] Specifically, the cross-sections of the linkage inclined groove 74 and the linkage inclined block 81 are T-shaped and compatible. The T-shaped fitting cross-section allows the linkage inclined block 81 to move left and right via the movement of the outer sleeve 71, ensuring the stability and reliability of the transmission connection.

[0032] In some embodiments, a guide shaft portion 13 is provided inside the housing 1 along the moving direction of the moving plate 6, and guide groove portions are respectively provided on both sides of the moving plate 6. The guide groove portions slide in conjunction with the guide shaft portion 13. Through the guiding constraint of the guide shaft portion 13 and the guide groove portions, radial offset can be avoided when the moving plate 6 slides back and forth, ensuring the alignment accuracy of the moving contact 3 and the stationary contact 2. The cross-section of the guide shaft portion 13 and the guide groove portions is arc-shaped or semi-circular, which can reduce the risk of friction jamming and improve the smoothness of the opening and closing action.

[0033] In some embodiments, a fixing seat 11 extends inwardly from the housing 1, and the inner sleeve 72 is fixedly installed on the side of the fixing seat 11 facing the moving plate 6. A through threaded hole is provided on the fixing seat 11, and an embedded adjusting bolt 12 is installed in the threaded hole. One end of the compression spring 73 abuts against the end of the adjusting bolt 12. By rotating the adjusting bolt 12, its depth of insertion into the inner sleeve 72 can be changed, thereby adjusting the pre-compression of the compression spring 73, realizing flexible adjustment of the reset force and the contact breaking speed to adapt to different vehicle circuit parameters and operating conditions. The embedded installation method can make full use of the internal space of the housing 1, making the overall structure more compact.

[0034] In some embodiments, a moving contact conductive sheet and a stationary contact conductive sheet are embedded within the housing 1. The moving contact conductive sheet is electrically connected to the moving contact 3 via a flexible wire, and the stationary contact conductive sheet is directly electrically connected to the stationary contact 2. Further, a terminal block 31 extends outward from the same side of the moving and stationary contact conductive sheets facing the housing 1. The pre-embedded conductive sheet structure improves the insulation and structural integrity of the housing 1. The flexible wire can bend back and forth with the moving contact 3, ensuring continuity of conductivity during movement. The terminal block 31 arranged on the same side facilitates centralized access to external wiring harnesses, improving the ease of on-site installation and wiring.

[0035] In some embodiments, two guide plates 14 are provided on the inner wall of the housing 1 facing the position where the moving contact 3 and the stationary contact 2 are joined. The two guide plates 14 are arranged parallel to each other vertically and form a guide groove. The isolation plate 8 is slidably disposed along the guide groove. The guide groove formed by the guide plates 14 can accurately guide the sliding path of the isolation plate 8 and avoid vertical deviation of the isolation plate 8 during movement.

[0036] Furthermore, arc-extinguishing plates 9 are provided on both the upper and lower sides of the isolation plate 8 near the moving contact 3 inside the housing 1. Each arc-extinguishing plate 9 includes an arc-shaped portion 92 and fixed portions 91 located on both sides of the arc-shaped portion 92. A top cover is provided on the housing 1, and the fixed plate portion 91 and the housing 1 are fixedly connected to the corresponding fixed groove on the top cover. The arc-shaped portion 92 is coaxially arranged around the outer ring of the moving contact 3 and the stationary contact 2, and a plurality of openings 93 are evenly arranged circumferentially on the arc-shaped portion 92. The arc-shaped portion 92 of the arc-extinguishing plate 9 can enclose the arc area when the contacts open and close, guide the arc to spread rapidly along the circumferential openings 93 and cool it down, and accelerate the extinguishing of the arc. Combined with the physical barrier effect of the isolation plate 8, the arc-extinguishing efficiency can be further improved and the service life of the circuit breaker can be extended.

[0037] In some embodiments, a viewing window 15 is provided on the housing 1 corresponding to the opening and closing positions of the moving contact 3 and the stationary contact 2. The viewing window 15 is made of high-strength, high-temperature resistant glass and embedded in the cover plate. Operators can directly observe the opening and closing status of the internal contacts, the degree of ablation, and the operation of the isolation plate 8 through the viewing window 15.

[0038] Furthermore, the outer wall of the housing 1 is provided with grooves on the opposite side and the left and right sides of the viewing window 15, and elastic pads 16 are embedded in the grooves. The elastic pads 16 can provide buffering and shock absorption when the circuit breaker is installed on a vehicle, to offset the vibration and impact during vehicle operation, and to adapt to the complex vibration conditions of the vehicle.

[0039] In some embodiments, such as Figure 4 As shown, both the stationary contact 2 and the moving contact 3 are provided with a first chamfer 10 at their ends, and the isolation plate 8 is provided with a second chamfer 82 at one end near the moving contact 3. The inclined surfaces of the first chamfer 10 and the second chamfer 82 are adapted to each other, so as to avoid hard collision and scratching between the end edge of the isolation plate 8 and the end face of the contact during the process of the isolation plate 8 extending into or out of the contact gap.

[0040] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0041] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0042] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A loss of voltage protected circuit breaker for an electric vehicle, comprising: The device includes a housing, a stationary contact, a moving contact, a coil assembly, an armature, and a movable plate. The coil assembly drives the armature to move. The movable plate is slidably disposed within the housing and connected to the armature. The moving contact is disposed in the middle of the movable plate. The stationary contact is fixed within the housing and located on the moving contact's path. Reset components are provided on both sides of the movable plate facing the stationary contact and between the movable plate and the inner wall of the housing. Each reset component includes an outer sleeve disposed on the movable plate, an inner sleeve disposed on the inner wall of the housing, and a compression spring abutting between the two. A linkage groove is provided on the upper side facing the moving contact. Isolation plates are slidably provided on both the left and right sides of the housing towards the opening and closing position of the moving and stationary contacts. The end of the linkage groove near the stationary contact is inclined towards the stationary contact. One end of the isolation plate is provided with a linkage block that slides and cooperates with the linkage groove. When the coil assembly loses pressure and the moving and stationary contacts separate, the two isolation plates extend into the opening and closing position of the moving and stationary contacts. When the moving and stationary contacts close, the two isolation plates retract from the opening and closing position of the moving and stationary contacts.

2. The loss of voltage protection circuit breaker according to claim 1, wherein, The cross-sections of the linkage inclined groove and the linkage inclined block are T-shaped and compatible.

3. The loss of voltage protection circuit breaker of claim 1, wherein, A fixed seat extends inward from the housing, and the inner sleeve is disposed on the fixed seat. The fixed seat is provided with a threaded hole, and an embedded adjusting bolt is disposed in the threaded hole. One end of the compression spring abuts against the end of the adjusting bolt.

4. The loss of voltage protection circuit breaker of claim 1, wherein, The housing contains a moving contact conductive sheet and a stationary contact conductive sheet. The moving contact conductive sheet is connected to the moving contact via a flexible wire, and the stationary contact conductive sheet is electrically connected to the stationary contact.

5. The loss of voltage protection circuit breaker of claim 4, wherein, A terminal block extends outward from the same side of the housing as the moving contact conductive sheet and the stationary contact conductive sheet.

6. A vehicle-mounted circuit breaker with undervoltage protection according to claim 1, characterized in that, A guide shaft is provided inside the housing along the moving direction of the moving plate, and guide grooves that slide and cooperate with the guide shaft are provided on both sides of the moving plate.

7. The loss of voltage protection circuit breaker of claim 1, wherein, The inner wall of the housing is provided with two guide plates facing the position where the moving contact and the stationary contact are separated and joined. The two guide plates form a guide groove, and the isolation plate is slidably disposed along the guide groove.

8. The loss of voltage protection circuit breaker of claim 7, wherein, Arc-extinguishing plates are provided on both the upper and lower sides of the isolation plate near the moving contact inside the housing. Each arc-extinguishing plate includes a fixed plate portion connected to the housing and an arc-shaped portion coaxially disposed on the outer ring of the moving and stationary contacts. Each arc-shaped portion has several openings in the circumferential direction.

9. The loss of voltage protection circuit breaker of claim 1, wherein, The housing is provided with a viewing window corresponding to the opening and closing position of the moving contact and the stationary contact.

10. The loss of voltage protection circuit breaker of claim 9, wherein, The outer wall of the housing is provided with grooves on the opposite side of the viewing window and on the left and right sides, and elastic pads are provided in the grooves.

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