motor protection circuit breaker

Abstract

The application discloses a motor protection circuit breaker and relates to the technical field of low-voltage electrical appliances. The motor protection circuit breaker comprises an operating mechanism, a contact system, a pressing plate and a linkage. The pressing plate has a pivoting end, a driving end and an abutting portion between the pivoting end and the driving end, and the driving end is used for driving the contact system to move. The linkage has a first linkage end and a second linkage end. The first linkage end is linked with the operating mechanism, and the second linkage end is abutted with the abutting portion so as to drive the abutting portion to rotate around the pivoting end under the driving of the operating mechanism. The motor protection circuit breaker sets the linkage and sets the abutting portion between the pivoting end and the driving end of the pressing plate, so that the same set of mechanical structures can match the contact systems with different stroke requirements, the universality of parts is greatly improved, and the development cycle and manufacturing cost of different shell frame products are reduced.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a motor protection circuit breaker. Background Technology

[0002] In traditional low-voltage circuit breakers, especially those protecting motors, the operating mechanism and auxiliary contacts typically employ a one-to-one correspondence design. The operating mechanism directly drives the pressure plate, which in turn moves the contacts of the contact system, thereby achieving the closing and opening of the circuit breaker. Simultaneously, the auxiliary contacts output corresponding switching states via the pressure plate's operating signal.

[0003] In this traditional structure, the output stroke of the operating mechanism is fixed, and the force-bearing point of the pressure plate is usually located at the end of its lever structure. When developing products with different shell currents (i.e., different capacity levels), the stroke requirements (opening distance and overtravel) of the contact system increase with the current, and the original operating mechanism cannot directly match the contact systems of different specifications. Therefore, designers must redesign the operating mechanism, pressure plate, and auxiliary contact mating structure for each shell current, resulting in a wide variety of parts, poor versatility, and significantly increased product development cycle and manufacturing costs. Summary of the Invention

[0004] The purpose of this application is to provide a motor protection circuit breaker, which, by setting a linkage and placing the abutment part between the pivot end and the drive end of the pressure plate, enables the same mechanical structure to match contact systems with different stroke requirements, greatly improving the versatility of parts and reducing the development cycle and manufacturing cost of different frame products.

[0005] The embodiments of this application are implemented as follows: A first aspect of this application provides a motor protection circuit breaker, including an operating mechanism, a contact system, a pressure plate, and a linkage. The pressure plate has a pivot end, a driving end, and an abutment portion located between the pivot end and the driving end. The driving end is used to drive the contact system to move. The linkage has a first linkage end and a second linkage end. The first linkage end is linked to the operating mechanism, and the second linkage end abuts against the abutment portion to push the abutment portion to rotate around the pivot end under the drive of the operating mechanism. This motor protection circuit breaker, by providing a linkage and positioning the abutment portion between the pivot end and the driving end of the pressure plate, allows the same mechanical structure to match contact systems with different stroke requirements, significantly improving the versatility of parts and reducing the development cycle and manufacturing cost of different frame products.

[0006] In one possible implementation, the operating mechanism includes a top rod that can move up and down, and the linkage includes a main body and an extension extending from one side of the main body toward a direction away from the abutting part. The two ends of the main body are a first linkage end and a second linkage end, respectively. The first linkage end abuts against the top rod, and the extension is used to link with an accessory.

[0007] In one possible implementation, the extension is located on the side of the main body closer to the accessory.

[0008] As one possible implementation, it also includes a housing, wherein at least one boss is provided on the linkage member, and at least one sliding groove is provided on the housing accordingly, wherein when the operating mechanism drives the linkage member to move, the boss slides in the sliding groove.

[0009] As one possible implementation, the operating mechanism further includes a side plate, and a limiting part is provided on the linkage member. The limiting part cooperates with the side plate. When the operating mechanism drives the linkage member to move, the limiting part abuts against the side plate to limit the offset of the linkage member.

[0010] As one possible implementation, a first connecting part is provided on the second linkage end, and a second connecting part is correspondingly provided on the abutting part, wherein the first connecting part and the second connecting part are detachably fixed.

[0011] As one possible implementation, a reset spring is also included, which acts on the linkage and is used to push the linkage upward to reset when the motor protection circuit breaker is closed.

[0012] In one possible implementation, the linkage is provided with a protruding post, the return spring is sleeved on the protruding post, one end of the return spring abuts against the linkage, and the other end passes through the pressure plate and abuts against the housing of the motor protection circuit breaker.

[0013] In one possible implementation, the operating mechanism includes a vertically movable push rod, and the contact system further includes a stationary contact, a moving contact, a contact support, and a contact spring. When the push rod moves upward, the linkage is lifted upward by the reset spring, the linkage drives the pressure plate upward, and the contact spring lifts the contact support upward, causing the moving contact to contact the stationary contact to achieve closing. Simultaneously, the linkage pushes the accessory, causing the accessory to output a closing signal. When the push rod moves downward, the push rod presses down on the linkage, the linkage drives the pressure plate downward, and the pressure plate overcomes the spring force of the contact spring to press the contact support downward, causing the moving contact to separate from the stationary contact to achieve opening. Simultaneously, the linkage separates from the accessory, causing the accessory to output an opening signal.

[0014] As one possible implementation, it also includes a detachable and fixed assist spring, and the operating mechanism also includes a side plate; the two ends of the assist spring are respectively used to hang on the side plate and the top rod.

[0015] The beneficial effects of the embodiments of this application include: The motor protection circuit breaker provided in this application forms a lever-like force transmission path by setting up a linkage component and placing the abutment portion of the linkage component between the pivot end and the drive end of the pressure plate. When the operating mechanism is activated, its movable part outputs a driving force with a small displacement, which is transmitted to the abutment portion of the pressure plate through the linkage component. Since the abutment portion of the linkage component is located between the pivot end and the drive end of the pressure plate, the pressure plate rotates around its pivot end after being driven at the abutment portion. According to the lever principle, the displacement of the drive end of the pressure plate is equal to the displacement at the abutment portion multiplied by (the distance from the drive end to the pivot end divided by the distance from the abutment portion to the pivot end). Since the distance from the drive end to the pivot end is greater than the distance from the abutment portion to the pivot end, the displacement of the drive end of the pressure plate is amplified. The amplified displacement of the drive end drives the contact support movement of the contact system, thereby realizing the closing or opening of the contacts. This design of the contact point position allows the same mechanical structure to adapt to contact systems with different stroke requirements: for small-shell products, the required opening distance and overtravel of the contact system are small, eliminating the need for a linkage; the operating mechanism can directly drive the pressure plate to meet the stroke requirements. For large-shell products, the required opening distance and overtravel of the contact system are large; by simply adding a linkage to the operating mechanism of the small-shell product and positioning the contact point near the pivot end, the lever principle can be used to amplify the smaller displacement output by the operating mechanism, thereby meeting the large stroke requirements. As a result, the operating mechanism and accessories can be universally used in products with different shell currents, significantly improving the commonality of parts and reducing the development cycle and manufacturing cost of different shell products. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram illustrating the working principle of the motor protection circuit breaker in the closed state, as provided in the embodiments of this application; Figure 2 A schematic diagram illustrating the working principle of the motor protection circuit breaker in the open state, provided in an embodiment of this application; Figure 3This is one of the structural schematic diagrams of the motor protection circuit breaker provided in the embodiment of this application in the closed state; Figure 4 This is one of the structural schematic diagrams of the motor protection circuit breaker in the open state provided in the embodiments of this application; Figure 5 A second schematic diagram of the motor protection circuit breaker in the closed state provided in the embodiments of this application; Figure 6 A second schematic diagram of the motor protection circuit breaker in the open state provided in the embodiments of this application; Figure 7 This is one of the structural schematic diagrams of the operating mechanism, linkage, and pressure plate provided in the embodiments of this application; Figure 8 This is one of the structural schematic diagrams of the linkage and pressure plate provided in the embodiments of this application; Figure 9 This is the second schematic diagram of the linkage and pressure plate provided in the embodiments of this application; Figure 10 A second schematic diagram of the operating mechanism, linkage, and pressure plate provided in the embodiments of this application; Figure 11 This is one of the structural schematic diagrams of the operating mechanism and the assist spring provided in the embodiments of this application; Figure 12 This is the second schematic diagram of the structure of the operating mechanism and the assist spring provided in the embodiments of this application; Figure 13 This is a schematic diagram of the structure of the auxiliary contact provided in the embodiments of this application; Figure 14 This is one of the structural schematic diagrams of the operating mechanism provided in the embodiments of this application in the closed state; Figure 15 This is the second schematic diagram of the operating mechanism in the closed state provided in the embodiments of this application; Figure 16 This is one of the structural schematic diagrams of the operating mechanism in the open state provided in the embodiments of this application; Figure 17 This is the second schematic diagram of the operating mechanism provided in the embodiment of this application in the open state.

[0018] Icons: 1-Operating mechanism; 1b-Cam; 1d-Upper linkage; 1e-Clutch; 1f-Lower linkage; 1g-Mechanism spring; 1h-Push rod; 1i-Side plate; 1i1-Side plate cam groove; 1i2-Side plate clutch groove; 1j-Assist spring; 2-Pressure plate; 2a-Pivot end; 2b-Drive end; 2c-Second connecting part; 3-Auxiliary contact; 3a-Push rod; 3b-Miniature moving contact; 3c1, 3c2, 3c3-Miniature stationary contact; 4-Contact system; 4a-Stationary contact; 4b-Moving contact; 4c-Contact support; 4d-Contact spring; 5-Linkage component; 5a-First linkage end; 5b-Extension; 5c-First connecting part; 5d-Boss; 5e-Limiting part; 5f-Protruding column; 6-Reset spring. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only some embodiments of this application, not all embodiments. Similar reference numerals and letters in the following drawings indicate similar items. Once an item is defined in one drawing, it does not need to be further defined in other drawings.

[0020] The terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and should not be construed as limiting this application. The terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to connections within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] Please refer to the reference. Figures 1 to 17This application provides a motor protection circuit breaker, including an operating mechanism 1, a contact system 4, a pressure plate 2, and a linkage 5. The pressure plate 2 has a pivot end 2a, a driving end 2b, and an abutment portion located between the pivot end 2a and the driving end 2b. The driving end 2b is used to drive the contact system 4 to move. The linkage 5 has a first linkage end 5a and a second linkage end. The first linkage end 5a is linked with the operating mechanism 1, and the second linkage end abuts against the abutment portion to push the abutment portion to rotate around the pivot end 2a under the drive of the operating mechanism 1. By setting the linkage 5 and placing the abutment portion between the pivot end 2a and the driving end 2b of the pressure plate 2, this motor protection circuit breaker allows the same mechanical structure to match contact systems 4 with different stroke requirements, significantly improving the versatility of parts and reducing the development cycle and manufacturing cost of different frame products.

[0023] It should be noted that, as Figures 1 to 6 As shown, the motor protection circuit breaker includes an operating mechanism 1, a contact system 4, a pressure plate 2, and a linkage 5. The operating mechanism 1 serves as the power source for the entire motor protection circuit breaker and is fixedly mounted on the circuit breaker housing. The pressure plate 2 is rotatably mounted between the operating mechanism 1 and the contact system 4. The pressure plate 2 has a pivot end 2a and a driving end 2b. The driving end 2b is used to directly or indirectly drive the contact support 4c of the contact system 4 to move. The linkage 5 is mounted between the operating mechanism 1 and the pressure plate 2 and has a first linkage end 5a and a second linkage end.

[0024] like Figures 1 to 6 As shown, the first linkage end 5a of the linkage member 5 is linked to the operating mechanism 1, and the second linkage end is linked to the abutment part. Specifically, the first linkage end 5a of the linkage member 5 is used to receive the driving force from the operating mechanism 1. Its specific engagement method can be abutment, connection, or hooking, as long as the motion transmission can be guaranteed. For example, the first linkage end 5a is in contact with the movable part of the operating mechanism 1 (e.g., the push rod 1h) to receive the driving force from the operating mechanism 1; at the same time, the second linkage end of the linkage member 5 acts directly on the abutment part of the pressure plate 2 to transmit the driving force to the pressure plate 2. When the operating mechanism 1 is activated, its power is transmitted to the linkage member 5 through the first linkage end 5a, and the linkage member 5 pushes the abutment part through the second linkage end, thereby causing the pressure plate 2 to rotate around its pivot end 2a. The above power transmission path is entirely realized by the first linkage end 5a and the second linkage end of the linkage member 5, which is simple in structure and does not depend on other additional structures of the linkage member 5.

[0025] like Figures 1 to 6As shown, the abutment is located between the pivot end 2a and the drive end 2b of the pressure plate 2. In other words, the abutment is neither at the pivot end 2a (otherwise, no driving torque can be generated) nor at the drive end 2b of the pressure plate 2 (otherwise, the displacement of the drive end 2b is equal to the displacement of the abutment, and stroke amplification cannot be achieved), but is located at a position between the two. The drive end 2b of the pressure plate 2 directly contacts the contact support 4c of the contact system 4 or is indirectly driven through an intermediate component. By reasonably selecting the specific position of the abutment, the lever amplification factor of the pressure plate 2 can be adjusted: the closer the abutment is to the pivot end 2a, the greater the amplification factor, that is, the greater the amplification ratio of the displacement of the drive end 2b relative to the displacement of the linkage 5, but the greater the driving force required by the linkage 5; the closer the abutment is to the drive end 2b, the smaller the amplification factor, but the smaller the required driving force. This positional layout allows designers to flexibly select the optimal abutment position according to the stroke requirements and operating force requirements of different frame products.

[0026] As described above, the motor protection circuit breaker provided in this application forms a lever-like force transmission path by setting a linkage 5 and placing the linkage 5 on the abutment portion of the pressure plate 2 between the pivot end 2a and the drive end 2b of the pressure plate 2. When the operating mechanism 1 is activated, its movable part outputs a driving force with a small displacement, which is transmitted to the abutment portion of the pressure plate 2 through the linkage 5. Since the abutment portion of the linkage 5 is located between the pivot end 2a and the drive end 2b of the pressure plate 2, the pressure plate 2 rotates around its pivot end 2a after being driven at the abutment portion. According to the lever principle, the displacement of the drive end 2b of the pressure plate 2 is equal to the displacement at the abutment portion multiplied by (the distance from the drive end 2b to the pivot end 2a divided by the distance from the abutment portion to the pivot end 2a). Since the distance from the drive end 2b to the pivot end 2a is greater than the distance from the abutment portion to the pivot end 2a, the displacement of the drive end 2b of the pressure plate 2 is amplified. The amplified drive end 2b displacement drives the contact system 4, which supports the movement of 4c, thereby achieving the closing or opening of the contacts. This design of the contact position allows the same mechanical structure to adapt to contact systems 4 with different stroke requirements: for small-frame products, the required opening distance and overtravel of contact system 4 are small, eliminating the need for linkage 5, and the operating mechanism 1 can directly drive the pressure plate 2 to meet the stroke requirements; for large-frame products, the required opening distance and overtravel of contact system 4 are large, requiring only the addition of linkage 5 to the small-frame operating mechanism 1, and setting the contact part close to the pivot end 2a, which utilizes the lever principle to amplify the small displacement output by the operating mechanism 1, thereby driving the drive end 2b of the pressure plate 2 to produce a larger displacement, meeting the large stroke requirements. Thus, by simply adding linkage 5, the operating mechanism 1 and accessories (such as auxiliary contacts 3) can be universally used in products with different frame currents, without needing to adjust the structural layout of each part of the operating mechanism 1, significantly improving the versatility of parts and reducing the development cycle and manufacturing cost of different frame products.

[0027] As one possible implementation method, such as Figures 1 to 6 As shown, the operating mechanism 1 includes a push rod 1h that can move up and down, and the linkage 5 includes a main body and an extension 5b extending from one side of the main body toward the direction away from the contact part. The two ends of the main body are a first linkage end 5a and a second linkage end, respectively. The first linkage end 5a abuts against the push rod 1h, and the extension 5b is used to link with the accessory.

[0028] It should be noted that the linkage 5 integrates the driving force of the operating mechanism 1 and the triggering action of the accessory (such as the auxiliary contact 3) into one unit through the main body and the extension 5b. The first linkage end 5a serves as the power input end, maintaining contact with the push rod 1h of the operating mechanism 1; the extension 5b serves as the signal output end, used to push the push rod 3a of the auxiliary contact 3; and the second linkage end serves as the power output end, abutting against the abutting part of the pressure plate 2. When the push rod 1h moves up and down, the linkage 5 moves up and down accordingly. On the one hand, the driving force is transmitted to the pressure plate 2 through the cooperation of the first linkage end 5a and the second linkage end; on the other hand, the push rod 3a is pushed or released through the extension 5b, causing the auxiliary contact 3 to output the corresponding closing or opening signal. Through the cooperative design of the main body and the extension 5b, parallel processing of power transmission and signal feedback is achieved, resulting in a compact structure and integrated functions, avoiding the need for separate signal triggering components.

[0029] As one possible implementation method, such as Figures 1 to 6 As shown, the extension 5b is located on the side of the main body near the accessory.

[0030] It should be noted that placing the extension 5b on the side of the main body closer to the accessory can, on the one hand, shorten the transmission path between the extension 5b and the accessory (such as the auxiliary contact 3), so that when the linkage 5 moves up and down, the extension 5b can quickly and accurately push or release the push rod 3a of the auxiliary contact 3, thereby improving the sensitivity of signal feedback; on the other hand, it can make full use of the space inside the housing, avoid interference between the extension 5b and other structures, and make the overall structure more compact and reasonable.

[0031] As one possible implementation method, such as Figure 7 and Figure 8 As shown, the motor protection circuit breaker also includes a housing, and at least one boss 5d is provided on the linkage 5. At least one sliding groove is provided on the housing accordingly. When the operating mechanism 1 drives the linkage 5 to move, the boss 5d slides in the sliding groove.

[0032] It should be noted that the linkage 5 is provided with at least one boss 5d, and the housing is provided with at least one corresponding groove. The cooperation between the boss 5d and the groove serves to guide and prevent rotation. Since the operating mechanism 1 (e.g., the push rod 1h) may generate a small lateral force when moving up and down, the sliding of the boss 5d in the groove can effectively limit the degree of freedom of movement of the linkage 5, so that it can only move smoothly in a preset direction (e.g., up and down), avoiding the linkage 5 from swaying or jamming during movement, thereby ensuring the stability and reliability of power transmission.

[0033] As one possible implementation method, such as Figures 3 to 8 As shown, the operating mechanism 1 also includes a side plate 1i, and a limiting part 5e is provided on the linkage 5. The limiting part 5e cooperates with the side plate 1i. When the operating mechanism 1 drives the linkage 5 to move, the limiting part 5e abuts against the side plate 1i to limit the offset of the linkage 5.

[0034] It should be noted that the operating mechanism 1 also includes a side plate 1i, which serves as a fixed structural component of the operating mechanism 1. By providing a limiting part 5e on the linkage 5 and having the limiting part 5e abut against the side plate 1i during movement, the offset of the linkage 5 in the direction perpendicular to its movement can be further limited. This limiting structure can effectively overcome the lateral force that may be generated when the top rod 1h is pressed down, ensuring that the linkage 5 always remains within the designed movement trajectory, preventing transmission failure or component wear due to excessive offset, and further improving the accuracy and service life of the circuit breaker operating mechanism 1.

[0035] As one possible implementation method, such as Figure 8 and Figure 9 As shown, a first connecting part 5c is provided on the second linkage end, and a second connecting part 2c is provided on the abutting part. The first connecting part 5c and the second connecting part 2c are detachably fixed.

[0036] It should be noted that the first connecting part 5c and the second connecting part 2c are detachably connected. For example, the first connecting part 5c can be configured as a plate-shaped barb structure, and the second connecting part 2c can be configured as a slot or snap-fit ​​structure. During assembly, the barb can be directly inserted into the slot to complete the fixation. During disassembly, a tool can be used to clamp the barb and deform it to remove it. This detachable connection method facilitates the assembly of the motor protection circuit breaker during the production process and the disassembly and assembly during subsequent maintenance, reducing the assembly difficulty and maintenance cost, while ensuring the reliability of the connection between the linkage 5 and the pressure plate 2.

[0037] As one possible implementation method, such as Figure 5 and Figure 6 , Figure 10As shown, the motor protection circuit breaker also includes a reset spring 6, which acts on the linkage 5 to push the linkage 5 upward to reset when the motor protection circuit breaker is closed.

[0038] It should be noted that the return spring 6 is located below or to the side of the linkage 5, always applying an upward elastic force to the linkage 5. When the circuit breaker is closed, the push rod 1h of the operating mechanism 1 is in the upper position. The return spring 6 pushes the linkage 5 upward, keeping it in contact with the push rod 1h, and causing the pressure plate 2 to move upward, thus keeping the contact system 4 closed. During the opening process, the push rod 1h presses down on the linkage 5, overcoming the elastic force of the return spring 6 to press the linkage 5 downward. After opening, the elastic force of the return spring 6 drives the linkage 5 upward to reset, preparing for the next closing operation. The presence of the return spring 6 ensures reliable contact between the linkage 5 and the push rod 1h, eliminates movement gaps, and improves the response speed and reliability of the transmission.

[0039] As one possible implementation method, such as Figure 5 and Figure 6 , Figure 10 As shown, a protrusion 5f is provided on the linkage 5, and a reset spring 6 is sleeved on the protrusion 5f. One end of the reset spring 6 abuts against the linkage 5, and the other end passes through the pressure plate 2 and abuts against the housing of the motor protection circuit breaker.

[0040] It should be noted that the return spring 6 is positioned by the protrusion 5f to prevent it from tilting or falling off during compression and extension. The return spring 6 passes through the pressure plate 2 and abuts against the housing, so that the elastic force of the return spring 6 acts directly between the linkage 5 and the housing, ensuring the stability of the force path and further improving the reliability of the linkage 5 in resetting when the circuit is closed.

[0041] As one possible implementation method, such as Figure 5 and Figure 6 As shown, the operating mechanism 1 includes a push rod 1h that can move up and down, and the contact system 4 includes a stationary contact 4a, a moving contact 4b, a contact support 4c, and a contact spring 4d. When the push rod 1h moves upward, the linkage 5 is pushed upward by the reset spring 6, and the linkage 5 drives the pressure plate 2 to move upward. The contact spring 4d pushes the contact support 4c upward, so that the moving contact 4b contacts the stationary contact 4a to achieve closing. At the same time, the linkage 5 pushes the accessory (such as the auxiliary contact 3) to output a closing signal. When the push rod 1h moves downward, the push rod 1h presses down on the linkage 5, and the linkage 5 drives the pressure plate 2 to move downward. The pressure plate 2 overcomes the elastic force of the contact spring 4d and presses the contact support 4c downward, so that the moving contact 4b separates from the stationary contact 4a to achieve opening. At the same time, the linkage 5 separates from the accessory, so that the accessory outputs an opening signal.

[0042] It should be noted that the contact system 4 can be designed individually according to the size of the frame current: for products with different frame currents, the current-carrying area of ​​the moving contact 4b and the stationary contact 4a, the stiffness of the contact spring 4d, and other parameters are all different, and the overall size and stroke requirements of the contact system 4 are also different. Through the linkage between the drive end 2b of the pressure plate 2 and the contact support 4c, contact systems 4 of different specifications can be driven to achieve closing and opening.

[0043] The closing process is driven by the operating mechanism 1. Internal transmission within the operating mechanism 1 moves the push rod 1h upwards to its uppermost position. The elastic force of the return spring 6 pushes the linkage 5 upwards, and the second linkage end drives the abutment portion of the pressure plate 2 upwards. Since the pressure plate 2 rotates around its pivot end 2a, when the abutment portion moves upwards, the driving end 2b of the pressure plate 2 also moves upwards. Simultaneously, the contact spring 4d of the contact system 4 is in a compressed state, constantly applying an upward elastic force to the contact support 4c. When the driving end 2b of the pressure plate 2 is lifted upwards, the contact support 4c moves upwards under the push of the contact spring 4d, causing the moving contact 4b to make close contact with the stationary contact 4a, completing the closing process. In the closed position, the extension 5b of the linkage 5 simultaneously pushes the push rod 3a of the auxiliary contact 3, causing the internal contacts of the auxiliary contact 3 to switch and output a closing signal. During the closing process, the return spring 6 and the contact spring 4d work together to ensure the speed of closing and the stability of the contact pressure.

[0044] The tripping process is also driven by the operating mechanism 1. Internal transmission within the operating mechanism 1 causes the push rod 1h to move downwards. The push rod 1h overcomes the elastic force of the return spring 6 and presses down on the linkage 5. The second linkage end drives the abutment portion of the pressure plate 2 to move downwards. Since the pressure plate 2 rotates around its pivot end 2a, when the abutment portion moves downwards, the driving end 2b of the pressure plate 2 also moves downwards. The driving end 2b of the pressure plate 2 presses down on the contact support 4c, overcoming the elastic force of the contact spring 4d and pressing the contact support 4c downwards, causing the moving contact 4b to separate from the stationary contact 4a, thus completing the tripping. In the tripped position, the extension 5b of the linkage 5 separates from the push rod 3a of the auxiliary contact 3. The push rod 3a resets under the action of the return spring 6 inside the auxiliary contact 3, and the contacts inside the auxiliary contact 3 switch, outputting a tripping signal. Through the coordination of the above-mentioned closing and opening processes, the motor protection circuit breaker can accurately transmit the movement of the operating mechanism 1 to the contact system 4 and the auxiliary contact 3, thereby realizing the on / off control and status signal output of the circuit breaker.

[0045] As one possible implementation method, such as Figure 11 and Figure 12 As shown, the motor protection circuit breaker also includes a detachable and fixed assist spring 1j, and the operating mechanism 1 also includes a side plate 1i; the two ends of the assist spring 1j are respectively used to hang on the side plate 1i and the top rod 1h.

[0046] It should be noted that the auxiliary spring 1j is an optional external spring. For small-frame products, the operating force provided by the internal mechanism spring 1g of the operating mechanism 1 is sufficient to drive the contact system 4, so the auxiliary spring 1j is not required. For large-frame products, since the contact spring 4d of the contact system 4 has greater stiffness, a greater operating force is required for reliable opening. In this case, the auxiliary spring 1j can be hung between the side plate 1i and the push rod 1h. The auxiliary spring 1j provides additional tension or compression during the opening process, helping the push rod 1h overcome the increased reaction force. Apart from the auxiliary spring 1j, all other components of the operating mechanism 1 are exactly the same as those of the small-frame product. This optional auxiliary spring 1j design allows the same operating mechanism 1 to be adapted to the force requirements of different frame products by simply adding accessories, further improving the versatility of parts.

[0047] As one possible implementation method, such as Figure 13 As shown, the auxiliary contact 3 includes a miniature moving contact 3b and multiple miniature stationary contacts; when the push rod 3a is pushed, it can change the connection state between the miniature moving contact 3b and the multiple miniature stationary contacts to output a corresponding closing signal or opening signal.

[0048] It should be noted that the auxiliary contact 3 uses a micro switch structure internally. For example, the auxiliary contact 3 has three output terminals, corresponding to three miniature stationary contacts, denoted as miniature stationary contact 3c1, miniature stationary contact 3c2, and miniature stationary contact 3c3. One end of the miniature moving contact 3b is fixedly connected to the miniature stationary contact 3c1, while the other end is a free end that can swing under the drive of the push rod 3a. When the push rod 3a is not pushed (i.e., in the open state), the free end of the miniature moving contact 3b contacts the miniature stationary contact 3c3, making the miniature stationary contact 3c1 and miniature stationary contact 3c3 conduct, while the miniature stationary contact 3c1 and miniature stationary contact 3c2 do not conduct. At this time, an open signal is output. When push rod 3a is pushed by extension 5b of linkage 5 (i.e., in the closed state), the free end of miniature moving contact 3b contacts miniature stationary contact 3c2, causing miniature stationary contact 3c1 to conduct with miniature stationary contact 3c2, while miniature stationary contact 3c1 and miniature stationary contact 3c3 do not conduct. At this time, a closing signal is output. Through this switching method, auxiliary contact 3 can clearly reflect the open / closed state of the circuit breaker. It is understandable that the number of outgoing terminals can be increased according to actual needs to output multiple sets of signals, such as one set for local indication and another set for remote monitoring.

[0049] As one possible implementation method, such as Figures 14 to 17 As shown, the operating mechanism 1 includes a cam 1b, an upper connecting rod 1d, a trip latch 1e, a lower connecting rod 1f, and a push rod 1h. In the closed state, the cam 1b rotates clockwise, causing the upper connecting rod 1d to slide, which in turn causes the trip latch 1e to rotate clockwise. The lower connecting rod 1f then drives the push rod 1h to move downward to achieve the opening of the circuit.

[0050] It should be noted that the operating mechanism 1 adopts a four-bar linkage structure, which has the advantages of reliable operation, fast breaking speed, and long mechanical life. In the closed position, cam 1b is at the first angle, upper connecting rod 1d is located on the right side of side plate cam groove 1i1, trip latch 1e is located on the right side of side plate trip latch groove 1i2, and push rod 1h is in the upper position. When a tripping command is received, cam 1b rotates clockwise, driving upper connecting rod 1d to slide to the left along cam 1b groove. Upper connecting rod 1d drives trip latch 1e to rotate clockwise around its axis. Trip latch 1e drives push rod 1h downward through lower connecting rod 1f. Push rod 1h presses down on linkage 5, thereby achieving tripping. When closing, cam 1b rotates counterclockwise, all components move in the opposite direction, and push rod 1h resets upward.

[0051] In summary, the motor protection circuit breaker provided in this application, by setting a linkage 5 and placing the linkage 5 on the abutment of the pressure plate 2 between the pivot end 2a and the drive end 2b of the pressure plate 2, allows the same mechanical structure to match contact systems 4 with different stroke requirements through the lever principle, achieving universality of the operating mechanism 1 and accessories (such as auxiliary contacts 3) in different frame current products. The structural design of the linkage 5 enables parallel processing of power transmission and signal feedback, resulting in a compact structure and integrated functions. The optional assist spring 1j allows the same operating mechanism 1 to adapt to the operating force requirements of different frame products by adding accessories, further improving the parts commonality rate. The return spring 6 ensures reliable contact between the linkage 5 and the push rod 1h, eliminating movement gaps. Therefore, the development cycle and manufacturing cost of different frame products are significantly reduced.

[0052] The above description is merely an optional embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately. At the same time, the various embodiments of this application can be combined with each other. As long as they do not violate the spirit of this application, they should also be regarded as the content disclosed in this application.

Claims

1. A motor protection circuit breaker, characterized in that, The device includes an operating mechanism (1), a contact system (4), a pressure plate (2), and a linkage (5). The pressure plate (2) has a pivot end (2a), a driving end (2b), and an abutment portion located between the pivot end (2a) and the driving end (2b). The driving end (2b) is used to drive the contact system (4) to move. The linkage (5) has a first linkage end (5a) and a second linkage end. The first linkage end (5a) is linked with the operating mechanism (1), and the second linkage end abuts against the abutment portion to push the abutment portion to rotate around the pivot end (2a) under the drive of the operating mechanism (1).

2. The motor protection circuit breaker according to claim 1, characterized in that, The operating mechanism (1) includes a top rod (1h) that can move up and down. The linkage (5) includes a main body and an extension (5b) extending from one side of the main body toward the direction away from the abutting part. The two ends of the main body are the first linkage end (5a) and the second linkage end, respectively. The first linkage end (5a) abuts against the top rod (1h). The extension (5b) is used to link with the accessory.

3. The motor protection circuit breaker according to claim 2, characterized in that, The extension (5b) is located on the side of the main body near the accessory.

4. The motor protection circuit breaker according to claim 1, characterized in that, It also includes a housing, on which at least one boss (5d) is provided, and on which at least one sliding groove is provided. When the operating mechanism (1) drives the linkage (5) to move, the boss (5d) slides in the sliding groove.

5. The motor protection circuit breaker according to claim 1, characterized in that, The operating mechanism (1) also includes a side plate (1i). The linkage (5) is provided with a limiting part (5e). The limiting part (5e) cooperates with the side plate (1i). When the operating mechanism (1) drives the linkage (5) to move, the limiting part (5e) abuts against the side plate (1i) to limit the offset of the linkage (5).

6. The motor protection circuit breaker according to claim 1, characterized in that, The second linkage end is provided with a first connecting part (5c), and the abutting part is provided with a corresponding second connecting part (2c). The first connecting part (5c) and the second connecting part (2c) are detachably fixed.

7. The motor protection circuit breaker according to claim 1, characterized in that, It also includes a reset spring (6), which acts on the linkage (5) to push the linkage (5) upward to reset when the motor protection circuit breaker is closed.

8. The motor protection circuit breaker according to claim 7, characterized in that, The linkage (5) is provided with a protrusion (5f), and the reset spring (6) is sleeved on the protrusion (5f). One end of the reset spring (6) abuts against the linkage (5), and the other end passes through the pressure plate (2) and abuts against the housing of the motor protection circuit breaker.

9. The motor protection circuit breaker according to claim 7, characterized in that, The operating mechanism (1) includes a push rod (1h) that can move up and down, and the contact system (4) also includes a stationary contact (4a), a moving contact (4b), a contact support (4c), and a contact spring (4d). When the push rod (1h) moves upward, the linkage (5) is pushed upward by the reset spring (6), the linkage (5) drives the pressure plate (2) to move upward, the contact spring (4d) pushes the contact support (4c) upward, so that the moving contact (4b) contacts the stationary contact (4a) to achieve closing, and at the same time the linkage (5) pushes the accessory, so that the accessory outputs a closing signal; When the push rod (1h) moves downward, the push rod (1h) presses down on the linkage (5), the linkage (5) drives the pressure plate (2) to move downward, the pressure plate (2) overcomes the elastic force of the contact spring (4d) and presses down on the contact support (4c), so that the moving contact (4b) separates from the stationary contact (4a) to realize the circuit breaker opening. At the same time, the linkage (5) separates from the accessory, so that the accessory outputs the circuit breaker opening signal.

10. The motor protection circuit breaker according to claim 2, characterized in that, It also includes a detachable and fixed assist spring (1j), and the operating mechanism (1) also includes a side plate (1i); the two ends of the assist spring (1j) are respectively used to hang on the side plate (1i) and the top rod (1h).

Images