motor protection circuit breaker

Abstract

A motor protection circuit breaker, relating to the field of low-voltage electrical technology, includes an operating mechanism, a contact system, a pressure plate, a mechanism linkage, and an auxiliary linkage. The pressure plate has a pivot end, a driving end, and a connecting portion 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 mechanism 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. The auxiliary linkage has a third linkage end, which is connected to the connecting portion so that the auxiliary linkage can move with the pressure plate. This motor protection circuit breaker transmits the driving force of the operating mechanism and the trigger signal of the accessory through the mechanism linkage and the auxiliary linkage, and the abutment portion of the mechanism linkage acting on the pressure plate is located between the pivot end and the driving end of the pressure plate, realizing the universality of the motor protection circuit breaker in different frame products.

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] For side-mounted auxiliary contact accessories, which are mounted on one side of the circuit breaker body, the operating mechanism presses down on the pressure plate, which directly drives the contacts inside the auxiliary contacts. 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 frame 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 frame 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 that transmits the driving force of the operating mechanism and the trigger signal of the accessory through a mechanism linkage and an auxiliary linkage. The abutment part of the mechanism linkage acting on the pressure plate is set between the pivot end and the driving end of the pressure plate, thereby realizing the universality of the motor protection circuit breaker in different frame products, greatly improving the universality 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, a mechanism linkage, and an auxiliary linkage. The pressure plate has a pivot end, a driving end, and a connecting portion 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 mechanism 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. The auxiliary linkage has a third linkage end, which is connected to the connecting portion so that the auxiliary linkage can move with the pressure plate. This motor protection circuit breaker transmits the driving force of the operating mechanism and the trigger signal of the accessory through the mechanism linkage and the auxiliary linkage, and the abutment portion of the mechanism linkage acting on the pressure plate is located between the pivot end and the driving end of the pressure plate. This achieves the universality of the motor protection circuit breaker in different frame products, greatly improving the commonality of parts and reducing the development cycle and manufacturing cost of different frame products.

[0006] As one possible implementation, it also includes a base, and the operating mechanism includes a top rod that can move up and down, with the first linkage end abutting against the top rod; the auxiliary linkage component also has a fourth linkage end, which is used to link with an accessory disposed on the side of the base.

[0007] As one possible implementation, the base is provided with a mechanism linkage slot and an auxiliary linkage slot, the mechanism linkage is disposed in the mechanism linkage slot, and the auxiliary linkage is disposed in the auxiliary linkage slot; an opening is provided on the side of the base, and the fourth linkage end is linked with the accessory through the opening.

[0008] In one possible implementation, the base has a first limiting part and a second limiting part disposed opposite to each other, and the auxiliary linkage member is located between the first limiting part and the second limiting part, and is clamped and limited by the first limiting part and the second limiting part.

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

[0010] In one possible implementation, the second linkage end and the third linkage end are respectively provided with a first connecting part and a second connecting part, and the connecting part and the abutting part are respectively provided with a third connecting part and a fourth connecting part, and the first connecting part and the second connecting part are detachably fixed to the third connecting part and the fourth connecting part, respectively.

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

[0012] In one possible implementation, a protruding post is provided on the linkage component of the mechanism, and the return spring is sleeved on the protruding post. One end of the return spring abuts against the linkage component of the mechanism, and the other end passes through the pressure plate and abuts against the base 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 pressure plate drives the auxiliary linkage upward, and the auxiliary linkage pushes an accessory located on the side of the motor protection circuit breaker, 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 pressure plate drives the auxiliary linkage downward, the auxiliary linkage separates from the accessory, and the accessory outputs 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 transmits the driving force of the operating mechanism and the trigger signal of the accessory through a linkage mechanism and an auxiliary linkage mechanism. The linkage mechanism acts on the abutment portion of the pressure plate, which is located between the pivot end and the driving end of the pressure plate, forming a lever-like force transmission path. When the operating mechanism operates, 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 mechanism. Since the abutment portion of the linkage mechanism is located between the pivot end and the driving 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 driving end of the pressure plate is equal to the displacement at the abutment portion multiplied by (the distance from the driving end to the pivot end divided by the distance from the abutment portion to the pivot end). Because the distance from the driving end to the pivot end is greater than the distance from the abutment portion to the pivot end, the displacement of the driving end of the pressure plate is amplified. The amplified displacement of the driving 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 motor protection circuit breaker to adapt to contact systems with different stroke requirements: For small-frame products, the required opening distance and overtravel of the contact system are small, eliminating the need for mechanical linkages and auxiliary linkages; the operating mechanism can directly drive the pressure plate to meet the stroke requirements. For large-frame products, the required opening distance and overtravel of the contact system are large; by simply adding mechanical linkages and auxiliary linkages to the operating mechanism of the small-frame 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. Furthermore, due to the independent auxiliary linkage, the movement of the auxiliary linkage driven by the pressure plate can drive the accessories located on the side of the base. Therefore, the motor protection circuit breaker of this application can be equipped with multiple accessories simultaneously. Thus, the operating mechanism and accessories can be universally used in products with different frame currents, significantly improving the commonality of parts and reducing the development cycle and manufacturing cost of different frame 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 One of the structural schematic diagrams of the operating mechanism, mechanism linkage, and pressure plate provided in the embodiments of this application; Figure 8 This is a schematic diagram of the structure of the base and auxiliary linkage provided in the embodiments of this application; Figure 9 One of the structural schematic diagrams of the base, mechanism linkage, and auxiliary linkage provided in the embodiments of this application; Figure 10 A second structural schematic diagram of the base, mechanism linkage, and auxiliary linkage provided in an embodiment 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 One of the structural schematic diagrams of the mechanism linkage, auxiliary linkage, and pressure plate provided in the embodiments of this application; Figure 14 A second schematic diagram of the mechanism linkage, auxiliary linkage, and pressure plate provided in the embodiments of this application; Figure 15 A second schematic diagram of the operating mechanism, linkage components, and pressure plate provided in an embodiment of this application; Figure 16 This is a schematic diagram of the structure of the auxiliary contact provided in the embodiments of this application; Figure 17 This is one of the structural schematic diagrams of the operating mechanism provided in the embodiments of this application in the closed state; Figure 18 This is the second schematic diagram of the operating mechanism in the closed state provided in the embodiments of this application; Figure 19 This is one of the structural schematic diagrams of the operating mechanism in the open state provided in the embodiments of this application; Figure 20 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-Third connecting part; 2d-Fourth connecting part; 3-Side-jointed auxiliary contact; 3a-Push rod; 3a2-Rotation center; 3b1, 3b2-Miniature moving contact; 3c1, 3c2, 3c3, 3c4-Miniature stationary contact; 3d - Contact linkage rod; 3d1 - Contact linkage rod protrusion; 3e - Hook; 4 - Contact system; 4a - Stationary contact; 4b - Moving contact; 4c - Contact support; 4d - Contact spring; 5 - Mechanism linkage component; 5c - First connecting part; 5d - Boss; 5e - Limiting part; 5f - Protrusion; 6 - Return spring; 7 - Auxiliary linkage component; 7a - Fourth linkage end; 7c - Second connecting part; 8 - Base; 8a - Opening; 8b - Mechanism linkage component slot; 8c - Auxiliary linkage component slot; 8d - First limiting part; 8e - Second limiting part. 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 20This application provides a motor protection circuit breaker, including an operating mechanism 1, a contact system 4, a pressure plate 2, a mechanism linkage 5, and an auxiliary linkage 7. The pressure plate 2 has a pivot end 2a, a driving end 2b, and a connecting portion and an abutting 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 mechanism linkage 5 has a first linkage end and a second linkage end. The first linkage end is linked with the operating mechanism 1, and the second linkage end abuts against the abutting portion to push the abutting portion to rotate around the pivot end 2a under the drive of the operating mechanism 1. The auxiliary linkage 7 has a third linkage end, which is connected to the connecting portion so that the auxiliary linkage 7 can move with the pressure plate 2. The motor protection circuit breaker transmits the driving force of the operating mechanism 1 and the trigger signal of the accessory through the mechanism linkage 5 and the auxiliary linkage 7 respectively, and sets the abutment part of the pressure plate 2 between the pivot end 2a and the driving end 2b. This realizes the universality of the motor protection circuit breaker in different frame products, greatly improves the universality of parts, and reduces 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, a mechanism linkage 5, and an auxiliary linkage 7. The operating mechanism 1 serves as the power source for the entire motor protection circuit breaker and is fixedly mounted on the base 8 of the circuit breaker. The pressure plate 2 is rotatably mounted and 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 drive contact system 4. The mechanism linkage 5 is located between the operating mechanism 1 and the pressure plate 2 and has a first linkage end and a second linkage end.

[0024] like Figures 1 to 6 As shown, the first linkage end of the linkage component 5 is linked to the operating mechanism 1, and the second linkage end is linked to the abutment portion. Specifically, the first linkage end of the linkage component 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 motion transmission is guaranteed. For example, the first linkage end maintains 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. Simultaneously, the second linkage end of the linkage component 5 acts directly on the abutment portion of the pressure plate 2 to transmit the driving force to the pressure plate 2. When the operating mechanism 1 operates, its power is transmitted to the linkage component 5 through the first linkage end. The linkage component 5 pushes the abutment portion through the second linkage end, thereby causing the pressure plate 2 to rotate around its pivot end 2a. The above power transmission path relies entirely on the first and second linkage ends of the linkage component 5, resulting in a simple structure that does not depend on any other additional structures of the linkage component 5.

[0025] like Figures 1 to 6As shown, the abutment portion of the linkage 5 acting on the pressure plate 2 is located between the pivot end 2a and the driving end 2b of the pressure plate 2. In other words, this abutment portion is neither at the pivot end 2a (otherwise, no driving torque can be generated) nor at the driving end 2b of the pressure plate 2 (otherwise, the displacement of the driving end 2b is equal to the displacement of the abutment portion, and stroke amplification cannot be achieved), but is located at a position between the two. The driving 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 portion, the lever amplification factor of the pressure plate 2 can be adjusted: the closer the abutment portion is to the pivot end 2a, the greater the amplification factor, that is, the greater the amplification ratio of the displacement of the driving 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 portion is to the driving 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 portion 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 transmits the driving force of the operating mechanism 1 and the trigger signal of the accessory (e.g., the side-mounted auxiliary contact 3) through the mechanism linkage 5 and the auxiliary linkage 7, respectively. The mechanism linkage 5 is positioned between the pivot end 2a and the driving end 2b of the pressure plate 2, forming a lever-like force transmission path. When the operating mechanism 1 is activated, its movable part outputs a driving force with a small displacement, which is transmitted to the abutment of the pressure plate 2 through the mechanism linkage 5. Since the abutment of the mechanism linkage 5 is located between the pivot end 2a and the driving end 2b of the pressure plate 2, the pressure plate 2 rotates around its pivot end 2a after being driven at the abutment. According to the lever principle, the displacement of the driving end 2b of the pressure plate 2 is equal to the displacement at the abutment multiplied by (the distance from the driving end 2b to the pivot end 2a divided by the distance from the abutment to the pivot end 2a). Because the distance from the driving end 2b to the pivot end 2a is greater than the distance from the abutment part to the pivot end 2a, the displacement of the driving end 2b of the pressure plate 2 is amplified. The amplified displacement of the driving end 2b drives the contact support 4c of the contact system 4, thereby realizing the closing or opening of the contacts. This design of the abutment part position allows the same motor protection circuit breaker to adapt to contact systems 4 with different stroke requirements: for small-frame products, the required opening distance and overtravel of the contact system 4 are small, and there is no need to set up the mechanism linkage 5 and auxiliary linkage 7. 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 the contact system 4 are large. It is only necessary to add the mechanism linkage 5 and auxiliary linkage 7 separately on the basis of the small-frame operating mechanism 1, and set the abutment part to a position close to the pivot end 2a. The lever principle can be used to amplify the small displacement output by the operating mechanism 1, thereby driving the driving end 2b of the pressure plate 2 to produce a large displacement to meet the large stroke requirements. Furthermore, due to the independent auxiliary linkage 7, the accessories located on the side of the base 8 can be driven by the movement of the auxiliary linkage 7 driven by the pressure plate 2. Therefore, the motor protection circuit breaker of this application can be equipped with multiple accessories simultaneously. Thus, by simply adding the mechanism linkage 5 and the auxiliary linkage 7, the operating mechanism 1 and accessories (such as the side-mounted auxiliary contact 3) can be universally used in products with different frame currents, without the need to adjust the structural layout of each part of the operating mechanism 1. This significantly improves the universality of parts and reduces the development cycle and manufacturing cost of products with different frame sizes.

[0027] As one possible implementation method, such as Figures 1 to 8 As shown, the motor protection circuit breaker also includes a base 8, and the operating mechanism 1 includes a top rod 1h that can move up and down, with the first linkage end abutting against the top rod 1h; the auxiliary linkage 7 also has a fourth linkage end 7a, which is used to link with the accessories on the side of the base 8.

[0028] It should be noted that the first linkage end of the mechanism linkage 5 directly abuts against the push rod 1h of the operating mechanism 1 to transmit the up and down movement of the push rod 1h, which is simple and reliable. The auxiliary linkage 7 is linked with the accessory (e.g., the side-mounted auxiliary contact 3) through the fourth linkage end 7a. For example, the fourth linkage end 7a can be a protrusion or a fork structure, which contacts the push rod 3a of the side-mounted auxiliary contact 3. When the auxiliary linkage 7 moves up and down with the pressure plate 2, the fourth linkage end 7a pushes or releases the push rod 3a, thereby causing the side-mounted auxiliary contact 3 to output the corresponding closing signal or opening signal.

[0029] As one possible implementation method, such as Figures 1 to 8 As shown, the base 8 is provided with a mechanism linkage slot 8b and an auxiliary linkage slot 8c. The mechanism linkage 5 is provided in the mechanism linkage slot 8b, and the auxiliary linkage 7 is provided in the auxiliary linkage slot 8c. An opening 8a is provided on the side of the base 8, and the fourth linkage end 7a is linked with the accessory through the opening 8a.

[0030] It should be noted that the mechanism linkage slot 8b and the auxiliary linkage slot 8c guide the mechanism linkage 5 and the auxiliary linkage 7 respectively, ensuring that they can only move up and down in the vertical direction and avoiding deviation or jamming. The position of the opening 8a corresponds to the fourth linkage end 7a of the auxiliary linkage 7, so that the fourth linkage end 7a can extend out of the base 8 and cooperate with accessories (such as the push rod 3a of the side-mounted auxiliary contact 3).

[0031] As one possible implementation method, such as Figure 9 As shown, the base 8 has a first limiting part 8d and a second limiting part 8e disposed opposite to each other. The auxiliary linkage 7 is located between the first limiting part 8d and the second limiting part 8e and is clamped and limited by the first limiting part 8d and the second limiting part 8e.

[0032] It should be noted that the first limiting part 8d and the second limiting part 8e are arranged opposite to each other on the base 8, so that the auxiliary linkage 7 is clamped between them. This clamping and limiting structure effectively restricts the degree of freedom of the auxiliary linkage 7 in the direction perpendicular to its movement, preventing the auxiliary linkage 7 from swaying or disengaging during its up-and-down movement. At the same time, the first limiting part 8d and the second limiting part 8e also guide the auxiliary linkage 7, ensuring that the auxiliary linkage 7 always moves smoothly along the preset trajectory, thereby guaranteeing the stability and reliability of signal transmission between the fourth linkage terminal 7a and the accessory, and further improving the operating accuracy of the circuit breaker.

[0033] As one possible implementation method, such as Figure 10 As shown, the motor protection circuit breaker also includes a base 8, and at least one boss 5d is provided on the mechanism linkage 5. At least one sliding groove is provided on the base 8. When the operating mechanism 1 drives the mechanism linkage 5 to move, the boss 5d slides in the sliding groove.

[0034] It should be noted that the linkage component 5 is provided with at least one boss 5d, and the base 8 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 component 5, so that it can only move smoothly in a preset direction (e.g., up and down), avoiding the linkage component 5 from swaying or jamming during movement, thereby ensuring the stability and reliability of power transmission.

[0035] As one possible implementation method, such as Figures 3 to 6 , Figure 13 As shown, the operating mechanism 1 also includes a side plate 1i, and a limiting part 5e is provided on the mechanism linkage 5. The limiting part 5e cooperates with the side plate 1i. When the operating mechanism 1 drives the mechanism linkage 5 to move, the limiting part 5e abuts against the side plate 1i to limit the offset of the mechanism linkage 5.

[0036] 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 component 5 and ensuring that the limiting part 5e abuts against the side plate 1i during movement, the offset of the linkage component 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 push rod 1h is pressed down, ensuring that the linkage component 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.

[0037] As one possible implementation method, such as Figure 13 and Figure 14 As shown, a first connecting part 5c and a second connecting part 7c are respectively provided on the second linkage end and the third linkage end, and a third connecting part 2c and a fourth connecting part 2d are respectively provided on the connecting part and the abutting part. The first connecting part 5c and the second connecting part 7c are detachably fixed to the third connecting part 2c and the fourth connecting part 2d respectively.

[0038] It should be noted that the first connecting part 5c and the second connecting part 7c are detachably fixed to the third connecting part 2c and the fourth connecting part 2d, respectively. For example, the first connecting part 5c and the second connecting part 7c can be configured as a plate-type barb structure, and the third connecting part 2c and the fourth connecting part 2d can be configured as a slot or snap-hole structure. During assembly, the barb can be directly inserted into the slot to complete the fixation. During disassembly, a tool is used to clamp the barb and deform it to remove it. This detachable connection method facilitates the assembly of the motor protection circuit breaker and the disassembly and assembly during subsequent maintenance, reduces the assembly difficulty and maintenance cost, and at the same time ensures the reliability of the connection between the mechanism linkage 5 and the auxiliary linkage 7 and the pressure plate 2.

[0039] As one possible implementation method, such as Figure 5 and Figure 6 , Figure 15 As shown, the motor protection circuit breaker also includes a reset spring 6, which acts on the linkage 5 of the mechanism to push the linkage 5 upward to reset when the motor protection circuit breaker is closed.

[0040] 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.

[0041] As one possible implementation method, such as Figure 5 and Figure 6 , Figure 15 As shown, a protrusion 5f is provided on the linkage component 5 of the mechanism, and a reset spring 6 is sleeved on the protrusion 5f. One end of the reset spring 6 abuts against the linkage component 5 of the mechanism, and the other end passes through the pressure plate 2 and abuts against the base 8 of the motor protection circuit breaker.

[0042] It should be noted that the return spring 6 is positioned by the protruding post 5f to prevent the return spring 6 from tilting or falling off during compression and extension; the return spring 6 passes through the pressure plate 2 and abuts against the base 8, so that the elastic force of the return spring 6 acts directly between the linkage 5 of the mechanism and the base 8, ensuring the stability of the force path and further improving the reliability of the reset of the linkage 5 of the mechanism when closing the circuit.

[0043] As one possible implementation method, such asFigure 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 mechanism linkage 5 is pushed upward by the reset spring 6. The mechanism linkage 5 drives the pressure plate 2 to move upward, and 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 pressure plate 2 drives the auxiliary linkage 7 to move upward, and the auxiliary linkage 7 pushes the setting... Accessories on the side of the motor protection circuit breaker (such as side-mounted auxiliary contact 3) enable the accessory to output a closing signal; when the push rod 1h moves downward, the push rod 1h presses down on the mechanism linkage 5, the mechanism 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 pressure plate 2 drives the auxiliary linkage 7 to move downward, the auxiliary linkage 7 separates from the accessory, so that the accessory outputs an opening signal.

[0044] It should be noted that the motor protection circuit breaker remains completely identical across products with different frame currents, achieving component standardization. The contact system 4 can be designed individually based on the frame current: products with different frame currents have different parameters such as the current-carrying area of ​​the moving contact 4b and stationary contact 4a, and the stiffness of the contact spring 4d. The overall dimensions and stroke requirements of the contact system 4 also differ. 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. This modular design approach allows for the design of the contact system 4 only for different frame products during production, while the motor protection circuit breaker can be uniformly designed and assembled, significantly reducing development cycle and manufacturing costs.

[0045] The closing process is driven by the operating mechanism 1. The internal transmission of 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 of the linkage 5 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. 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 tight contact with the stationary contact 4a, completing the closing process. Simultaneously, the upward movement of the pressure plate 2 drives the auxiliary linkage 7 upwards. The fourth linkage end 7a of the auxiliary linkage 7 pushes the push rod 3a of the side-mounted auxiliary contact 3, causing the internal contacts of the side-mounted auxiliary contact 3 to switch and output a closing signal. During the closing process, the reset spring 6 and the contact spring 4d work together to ensure the speed of closing and the stability of the contact pressure.

[0046] The tripping process is also driven by the operating mechanism 1. The internal transmission of 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 of the linkage 5 drives the abutment part of the pressure plate 2 to move downwards. Since the pressure plate 2 rotates around its pivot end 2a, when the abutment part 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. Simultaneously, the downward movement of the pressure plate 2 drives the auxiliary linkage 7 to move downwards. The fourth linkage end 7a of the auxiliary linkage 7 separates from the push rod 3a of the side-joined auxiliary contact 3. The push rod 3a resets under the action of the internal return spring 6, and the internal contacts of the side-joined 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 side-mounted auxiliary contact 3, thereby realizing the on / off control and status signal output of the circuit breaker.

[0047] 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.

[0048] 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.

[0049] As one possible implementation method, such as Figure 16 As shown, the motor protection circuit breaker also includes a side-mounted auxiliary contact 3, which is mounted on the side of the base 8. The side-mounted auxiliary contact 3 includes a push rod 3a, multiple miniature moving contacts, and multiple miniature stationary contacts. When the push rod 3a is pushed, it can change the connection state between the multiple miniature moving contacts and the multiple miniature stationary contacts to output corresponding closing or opening signals.

[0050] It should be noted that the side-mounted auxiliary contact 3 is hung on the side of the base 8 via hook 3e, enabling quick installation and removal. As an example, the side-mounted auxiliary contact 3 can employ a dual-channel microswitch structure internally. Specifically, it is equipped with two miniature moving contacts 3b1 and 3b2 and four miniature stationary contacts 3c1, 3c2, 3c3, and 3c4. The upper terminal forms a first circuit via miniature stationary contact 3c1, miniature moving contact 3b1, and miniature stationary contact 3c2, while the lower terminal forms a second circuit via miniature stationary contact 3c3, miniature moving contact 3b2, and miniature stationary contact 3c4. The two miniature moving contacts 3b1 and 3b2 are connected via contact linkage rod 3d, allowing for synchronous movement. Push rod 3a is fixed on the rotation center 3a2 of push rod 3a. When push rod 3a is pushed, it pushes the contact linkage rod protrusion 3d1, causing the contact linkage rod 3d to move up and down, thereby driving the two miniature moving contacts 3b1 and 3b2 to contact or separate from the corresponding miniature stationary contacts. When push rod 3a is pushed, the two miniature moving contacts 3b1 and 3b2 separate from the miniature stationary contacts, outputting a trip signal; when push rod 3a is released, the two miniature moving contacts 3b1 and 3b2 contact the miniature stationary contacts, outputting a closing signal. It is understandable that the number of outgoing terminals and the normally open / normally closed state of the contacts can be adjusted according to actual needs, as long as it reflects the opening and closing status of the circuit breaker.

[0051] As one possible implementation method, such as Figures 17 to 20 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.

[0052] 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 the linkage 5 of the mechanism, thereby achieving tripping. When closing, cam 1b rotates counterclockwise, all components move in the opposite direction, and push rod 1h resets upward.

[0053] In summary, the motor protection circuit breaker provided in this application, by setting up a mechanism linkage 5 and an auxiliary linkage 7, and placing the abutment part of the mechanism linkage 5 on the pressure plate 2 between the pivot end 2a and the drive end 2b of the pressure plate 2, allows the same set of motor protection circuit breakers to match contact systems 4 with different stroke requirements through the lever principle, realizing the universality of the operating mechanism 1 and accessories (such as side-mounted auxiliary contacts 3) in different frame current products. The mechanism linkage 5 and auxiliary linkage 7 are guided by the mechanism linkage slot 8b and auxiliary linkage slot 8c in the base 8, ensuring smooth and reliable movement. The optional assist spring 1j allows the same operating mechanism 1 to adapt to the operating force requirements of different frame products, further improving the parts commonality rate. The return spring 6 ensures reliable contact between the mechanism linkage 5 and the push rod 1h, eliminating movement gaps. The detachable connection facilitates assembly and maintenance. Therefore, the development cycle and manufacturing cost of different frame products are significantly reduced.

[0054] 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.

[0055] 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), a mechanism linkage (5), and an auxiliary linkage (7). The pressure plate (2) has a pivot end (2a), a driving end (2b), and a connecting part and an abutting part 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 mechanism linkage (5) has a first linkage end and a second linkage end. The first linkage end is linked with the operating mechanism (1), and the second linkage end abuts against the abutting part to push the abutting part to rotate around the pivot end (2a) under the drive of the operating mechanism (1). The auxiliary linkage (7) has a third linkage end, which is connected to the connecting part so that the auxiliary linkage (7) can move with the pressure plate (2).

2. The motor protection circuit breaker according to claim 1, characterized in that, It also includes a base (8), and the operating mechanism (1) includes a top rod (1h) that can move up and down, and the first linkage end abuts against the top rod (1h); the auxiliary linkage component (7) also has a fourth linkage end (7a), which is used to link with an accessory disposed on the side of the base (8).

3. The motor protection circuit breaker according to claim 2, characterized in that, The base (8) is provided with a mechanism linkage slot (8b) and an auxiliary linkage slot (8c). The mechanism linkage (5) is provided in the mechanism linkage slot (8b), and the auxiliary linkage (7) is provided in the auxiliary linkage slot (8c). The side of the base (8) is provided with an opening (8a), and the fourth linkage end is linked with the accessory through the opening (8a).

4. The motor protection circuit breaker according to claim 2, characterized in that, The base (8) has a first limiting part (8d) and a second limiting part (8e) disposed opposite to each other. The auxiliary linkage (7) is located between the first limiting part (8d) and the second limiting part (8e) and is clamped and limited by the first limiting part (8d) and the second limiting part (8e).

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 component (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 component (5) to move, the limiting part (5e) abuts against the side plate (1i) to limit the offset of the linkage component (5).

6. The motor protection circuit breaker according to claim 1, characterized in that, The second linkage end and the third linkage end are respectively provided with a first connecting part (5c) and a second connecting part (7c), and the connecting part and the abutting part are respectively provided with a third connecting part (2c) and a fourth connecting part (2d). The first connecting part (5c) and the second connecting part (7c) are detachably fixed to the third connecting part (2c) and the fourth connecting part (2d).

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) of the mechanism 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 component (5) of the mechanism 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 component (5), and the other end passes through the pressure plate (2) and abuts against the base (8) 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 mechanism linkage (5) is pushed upward by the reset spring (6), the mechanism 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 pressure plate (2) drives the auxiliary linkage (7) to move upward, the auxiliary linkage (7) pushes the accessory set on the side of the motor protection circuit breaker, so that the accessory outputs a closing signal; When the push rod (1h) moves downward, the push rod (1h) presses down on the mechanism linkage (5), the mechanism 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 pressure plate (2) drives the auxiliary linkage (7) to move downward, the auxiliary linkage (7) 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