Fast closing mechanism and circuit breaker

Abstract

The present application discloses a rapid closing mechanism and a circuit breaker, which relate to the technical field of circuit breakers. The rapid closing mechanism includes: a static contact and a moving contact, wherein the moving contact is pre-tightened in a direction away from the static contact by a first elastic member. A transmission rod is provided on the side of the static contact away from the moving contact, and includes a first abutting portion and a receiving portion, wherein the first abutting portion is used to abut the moving contact and compress the first elastic member, and the receiving portion is provided with an avoidance groove. A splint is provided with a first transmission member and a second transmission member connected to each other. A slider is slidably provided on the splint and connected to the second transmission member, and a guide surface is provided on the slider. A locking block is slidably provided on the splint, and includes a contact end and a second abutting portion, wherein the contact end slides with the guide surface, and the second abutting portion abuts against the receiving portion. The rapid closing mechanism and circuit breaker provided by the present application can speed up the closing process and reduce the impact of the arc generated during the closing process on the various components of the circuit breaker.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a fast closing mechanism and a circuit breaker. Background Art

[0002] A motor circuit breaker is a circuit breaker designed specifically to protect motors from overload, short circuit, phase loss, and other faults. During the opening and closing process, an arc is generated between the moving and stationary contacts of the motor circuit breaker. If this arc persists for a long time, it can easily burn surrounding components.

[0003] Existing motor circuit breakers are usually equipped with a fast tripping mechanism, which can use the energy storage spring to quickly release energy to separate the moving contact and the static contact when tripping is required, so as to speed up the arc extinction and reduce the negative impact caused by the arc.

[0004] However, during the closing process, since there is no fast closing mechanism, the speed at which the moving contact approaches the static contact is directly related to the operating speed. It is easy for the arc to exist for a long time due to the slow operating speed, which causes great harm to various components and affects the service life of the motor circuit breaker. Summary of the Invention

[0005] The purpose of the present application is to provide a fast closing mechanism and a circuit breaker, which can speed up the closing process and reduce the impact of the arc generated during the closing process on various components of the circuit breaker.

[0006] In a first aspect, an embodiment of the present application provides a rapid closing mechanism, which is applied to a circuit breaker. The circuit breaker includes a static contact and a moving contact, and the moving contact is pre-tightened in a direction away from the static contact by a first elastic member. The rapid closing mechanism includes a transmission rod, a splint, a slider and a locking block. The transmission rod is arranged on the side of the static contact away from the moving contact, and includes: a first abutting portion and a receiving portion, the first abutting portion is used to abut the moving contact and compress the first elastic member, and the receiving portion is provided with an avoidance groove. The splint is installed with a first transmission member and a second transmission member connected to each other. The slider is slidably arranged on the splint and connected to the second transmission member, and a guide surface is provided on the slider. The locking block is slidably arranged on the splint, and includes: a contact end and a second abutting portion, the contact end slides in cooperation with the guide surface, and the second abutting portion abuts against the receiving portion.

[0007] When closing the circuit breaker, the first transmission member is driven by external force, and the slider is driven to slide through the second transmission member. The guide surface pushes the contact end to make the locking block slide to the second abutment part and insert into the avoidance groove. The first abutment part disengages from the moving contact, and the first elastic member is released to push the moving contact to quickly close the static contact.

[0008] By providing a slider and a locking block on the clamping plate, the locking block can be used to compress the transmission rod in the initial closing phase, thereby keeping the moving contact stationary. The slider then pushes against the locking block during the closing process. As the closing operation nears completion, the locking block is pushed to the second abutment portion and inserted into the escape groove of the transmission rod, releasing the locking block's pressure on the transmission rod. This allows the first elastic member to instantly release and push the moving contact into rapid engagement with the static contact. This design significantly accelerates closing speed, avoids being affected by operating speed, and effectively reduces the risk of damage caused by arcing.

[0009] In some examples, the slider includes an integrally formed linkage portion and a first sliding portion, the linkage portion is provided with a waist-shaped hole, the second transmission member passes through the waist-shaped hole and selectively abuts against the hole wall to enable the slider to slide in a straight line.

[0010] The slider is manufactured using an integrated molding process, resulting in high structural strength. By providing a waist-shaped hole in the slider's linkage, the second transmission member, which runs through the waist-shaped hole, can not only drive the slider by abutting against the hole wall, but also transform the second transmission member's motion into linear sliding of the slider by changing the abutment position. This helps improve the precision and reliability of the fit between the second transmission member and the slider, and between the slider and the locking block.

[0011] In some examples, the first sliding portion is provided with a first sliding groove and a second sliding groove relative to each other, the splint is provided with a third sliding groove matching the first sliding portion, and the first sliding groove and the second sliding groove are clamped on the inner wall of the third sliding groove to form a bidirectional limiting sliding pair.

[0012] The first and second slide grooves arranged relatively to each other cooperate with the third slide groove at the same time to form a bidirectional limiting sliding pair structure between the first sliding part and the splint. This structure can effectively prevent the slider from deflecting or getting stuck during movement, and the bidirectional force design enables the slider to obtain uniform guide support during reciprocating motion, and can also improve the assembly accuracy and meet the requirements of the rapid closing mechanism for movement accuracy.

[0013] In some examples, the locking block includes an integrally formed contact end, a second sliding portion, and a second abutting portion, the contact end includes an extension section and a contact surface provided at the end of the extension section, the slider is provided with a guide boss, the guide surface is provided on the guide boss, an avoidance space is formed between the extension section and the second sliding portion, the guide boss is adapted to the avoidance space, and the contact surface is in contact with the guide surface.

[0014] The locking block is manufactured using an integrated molding process, resulting in high structural strength. An extension section is provided on the contact end to mate with the guide boss on the slider. The clearance created between the extension section and the second sliding portion provides clearance for the guide boss during sliding, ensuring that the guide boss maintains a constant push against the contact end. This ensures accurate and timely linkage between the slider and locking block, improving the accuracy and reliability of the rapid closing mechanism.

[0015] In some examples, the contact surface is set as a curved surface, and the guide surface is set as an inclined surface, or the contact surface is set as an inclined surface, and the guide surface is set as a curved surface.

[0016] The use of a combination of arc surface and inclined surface can ensure that the contact surface and the guide surface always maintain a line-surface contact. During the relative sliding of the contact surface and the guide surface, it can not only ensure that the guide surface provides a stable push-pushing effect on the contact surface, but also reduce the friction between the guide surface and the contact surface, so that the slider and the lock block can smoothly move relative to each other, thereby improving the stability of the quick closing mechanism.

[0017] In some examples, the second sliding portion is provided with a through hole, the splint is provided with a first connecting plate and a second connecting plate which are parallel to each other, a sliding rod is provided between the first connecting plate and the second connecting plate, and the second sliding portion is slidably connected to the sliding rod through the through hole.

[0018] The second sliding part and the splint adopt the cooperation form of through hole and sliding rod, which is similar to the common cooperation form of sleeve and shaft. This design form can ensure the smooth sliding of the locking block while having the characteristics of simple structure, easy assembly and high stability, which is conducive to the locking block to smoothly complete the closing action during the closing process and ensure that the rapid closing mechanism is stable and reliable.

[0019] In some examples, a second elastic member is provided on the sliding rod, and the second elastic member is located between the second sliding portion and the second connecting plate. When the guide boss pushes against the contact end, the second elastic member is compressed to store energy.

[0020] The setting of the second elastic member can maintain a compressed energy storage state during the closing process. The elastic force applied to the locking block is in the opposite direction to the thrust force applied by the slider to the locking block, which is conducive to clamping the locking block to prevent the locking block from shaking or rotating. At the same time, the locking block can be quickly pushed to reset during opening, so that the locking block can abut and press the transmission rod through the second abutting portion to keep the moving contact and the static contact in the opening state. This design is beneficial to the stability of the closing process and the maintenance of the opening state, effectively improving the overall reliability and practicality of the rapid closing mechanism.

[0021] In some examples, the splint is further provided with a limiting boss, which is located between the slider and the locking block. The second sliding portion is further provided with a limiting groove, and the limiting boss is plugged into the limiting groove to constrain the travel of the locking block.

[0022] The setting of the limiting boss can cooperate with the limiting groove to limit the distance between the locking block and the slider, preventing the contact surface and the guide surface from close contact in the open state, and maintaining a certain gap between the two. This can reduce the force required in the initial stage of closing, facilitate smooth closing operation, and help improve the operational convenience of the quick closing mechanism.

[0023] In some examples, a side of the second abutting portion close to the transmission rod is configured as an arc surface.

[0024] Setting the second abutment portion as an arc surface can keep the contact between the second abutment portion and the transmission rod as line-surface contact. This will not affect the clamping force exerted by the second abutment portion on the transmission rod, but can also reduce the friction between the second abutment portion and the transmission rod, so that the second abutment portion and the transmission rod can slide relative to each other smoothly, which is conducive to the smooth operation of the quick closing mechanism.

[0025] In a second aspect, an embodiment of the present application further provides a circuit breaker, comprising a static contact, a moving contact and the above-mentioned rapid closing mechanism, wherein the moving contact is pre-tightened in a direction away from the static contact by a first elastic member, and the rapid closing mechanism is connected to the moving contact.

[0026] The fast closing mechanism provided in this application can effectively increase the closing speed of the circuit breaker, reduce the risk of arcing between the moving contact and the static contact for too long during the closing process, thereby improving the closing reliability and safety of the circuit breaker, and is conducive to increasing the service life of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the structure of the rapid closing mechanism provided in an embodiment of the present application in an open state;

[0029] Figure 2 A schematic diagram of the structure of the lock block and the slider in the open state of the rapid closing mechanism provided by an embodiment of the present application;

[0030] Figure 3 A schematic diagram of the structure of the fast closing mechanism during the closing process provided in an embodiment of the present application;

[0031] Figure 4 A schematic structural diagram of the fast closing mechanism provided in an embodiment of the present application in a closed state;

[0032] Figure 5 A schematic diagram of the structure of the lock block and the slider in the closed state of the rapid closing mechanism provided by an embodiment of the present application;

[0033] Figure 6 A schematic diagram of the structure of a slider provided in an embodiment of the present application;

[0034] Figure 7 A schematic diagram of the structure of a splint provided in an embodiment of the present application;

[0035] Figure 8 A schematic diagram of the structure of a slider and a locking block provided in an embodiment of the present application being slidably mounted on a splint;

[0036] Figure 9 A schematic structural diagram of a locking block provided in an embodiment of the present application;

[0037] Figure 10 This is a schematic diagram of the structure of the slider and the locking block provided in an embodiment of the present application cooperating on the splint.

[0038] Explanation of reference numerals: 1, static contact; 2, moving contact; 21, first elastic member; 3, transmission rod; 31, first abutting portion; 32, receiving portion; 321, avoidance groove; 4, clamping plate; 41, first plate; 42, second plate; 43, arc-shaped through hole; 44, third sliding groove; 45, first connecting plate; 46, second connecting plate; 47, sliding rod; 48, second elastic member; 49, limiting boss; 5, slider; 51 , linkage part; 511, waist-shaped hole; 52, first sliding part; 521, first slide groove; 522, second slide groove; 53, guide boss; 531, guide surface; 6, locking block; 61, contact end; 611, extension section; 612, contact surface; 613, avoidance space; 62, second abutting part; 63, second sliding part; 631, through hole; 632, limiting groove; 7, first transmission member; 8, second transmission member. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0043] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] Existing motor circuit breakers are usually equipped with a fast tripping mechanism, which can use the characteristics of the mechanism to quickly separate the moving contact and the static contact during tripping, so as to speed up the arc extinction and reduce the damage caused by the existence of the arc.

[0045] The closing process of existing motor circuit breakers requires the operator to operate a closing button or knob, which then drives the moving contact through a transmission mechanism to approach and engage the static contact to complete the closing process. This operation is typically slow, which in turn affects the closing speed. This causes the arc generated during the closing process to persist for an extended period, compromising the safe use of the motor circuit breaker.

[0046] Based on this, the embodiments of the present application provide a fast closing mechanism and a circuit breaker, which can speed up the closing process and reduce the impact of the arc generated during the closing process on various components of the circuit breaker.

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0048] Figure 1 This is a schematic diagram of the structure of the fast closing mechanism provided in the embodiment of the present application in the open state. Figure 1An embodiment of the present application provides a circuit breaker, including a static contact 1, a moving contact 2 and a fast closing mechanism. The moving contact 2 is pre-tightened in a direction away from the static contact 1 by a first elastic member 21, and the fast closing mechanism is connected to the moving contact 2.

[0049] The static contact 1 is fixed, while the moving contact 2 is movably mounted near the static contact 1. A first elastic member 21 is provided on the side of the moving contact 2 facing away from the static contact 1. The first elastic member 21 can be a compression spring, a spring washer, or other elastic member. When the circuit breaker is in the open state, the first elastic member 21 is compressed. When closing the circuit breaker, the elastic force of the first elastic member 21 pushes the moving contact 2 into engagement with the static contact 1, completing the closing process.

[0050] The fast closing mechanism provided in the present application can effectively increase the speed at which the moving contact 2 approaches the static contact 1 during the closing process, and reduce the risk that the arc generated by the moving contact 2 and the static contact 1 during the closing process will last too long, thereby improving the closing speed, reliability and safety of use of the circuit breaker, and is conducive to increasing the service life of the circuit breaker.

[0051] Please refer to Figures 1 to 5 This embodiment provides a rapid closing mechanism, including a transmission rod 3, a clamping plate 4, a slider 5 and a locking block 6.

[0052] The transmission rod 3 is arranged on the side of the static contact 1 away from the moving contact 2. The transmission rod 3 includes a first abutting portion 31 and a receiving portion 32. The first abutting portion 31 is used to abut the moving contact 2 and compress the first elastic member 21. The receiving portion 32 is provided with an avoidance groove 321.

[0053] The clamping plate 4 is provided with a first transmission member 7 and a second transmission member 8 which are connected to each other.

[0054] The slider 5 is slidably mounted on the clamping plate 4 and connected to the second transmission member 8. The slider 5 is provided with a guide surface 531. The locking block 6 is slidably mounted on the clamping plate 4. The slider 5 includes a contact end 61 and a second abutting portion 62. The contact end 61 slidably engages with the guide surface 531, and the second abutting portion 62 abuts against the receiving portion 32.

[0055] When closing the circuit breaker, the first transmission member 7 is driven by an external force, and the slider 5 is driven to slide through the second transmission member 8. The guide surface 531 pushes the contact end 61 to make the locking block 6 slide to the second abutment portion 62 and insert into the avoidance groove 321. The first abutment portion 31 disengages from the moving contact 2, and the first elastic member 21 is released to push the moving contact 2 to quickly close the static contact 1.

[0056] By providing the slider 5 and the locking block 6 on the clamping plate 4, the locking block 6 can be used to first compress the transmission rod 3 at the initial stage of closing, so that the moving contact 2 remains stationary during the initial stage of closing. Then, the slider 5 can be used to push the locking block 6 during the closing process. When the closing operation is about to end, the locking block 6 is pushed to the second abutting portion 62 and inserted into the avoidance groove 321 of the transmission rod 3, releasing the pressing force of the locking block 6 on the transmission rod 3, so that the first elastic member 21 can be instantly released and push the moving contact 2 to quickly engage with the static contact 1. This design can significantly speed up the closing speed, avoid being affected by the operating speed, and effectively reduce the risk of damage caused by the prolonged arc during the closing process.

[0057] Reference Figure 1 and Figure 4 The transmission rod 3 is arranged on the side of the static contact 1 away from the moving contact 2. The transmission rod 3 can abut the moving contact 2 or the contact support for installing the moving contact 2 through the first abutting portion 31 to provide a clamping force, and the direction of the clamping force is opposite to the direction of the elastic force provided by the first elastic member 21.

[0058] In the open state, the transmission rod 3 receives the clamping force provided by the locking block 6 through the receiving portion 32, and then transmits it to the first abutting portion 31. The first abutting portion 31 transmits the clamping force to the moving contact 2, so that the moving contact 2 is located away from the static contact 1 and remains stationary, and the first elastic member 21 remains in a compressed state.

[0059] The avoidance groove 321 provided on the receiving portion 32 is located on the sliding path of the locking block 6 , and the shape and size of the avoidance groove 321 match those of the second abutting portion 62 , making it easy for the second abutting portion 62 to be inserted into the avoidance groove 321 .

[0060] Reference Figure 2 and Figure 3 The clamping plate 4 includes a first plate 41 and a second plate 42 arranged parallel and opposite to each other. The clamping plate 4 is used to install various components. The first transmission member 7 and the second transmission member 8 are movably installed between the first plate 41 and the second plate 42. The first transmission member 7 is used to connect the operating member (such as Figure 1 The closing and opening button in the upper middle part is used as the opening and closing button. The force of the operator controlling the operating member to close the circuit breaker is transmitted to the first transmission member 7, and then transmitted from the first transmission member 7 to the second transmission member 8.

[0061] The slider 5 is slidably mounted on the splint 4, specifically on the side of the first plate 41 away from the second plate 42. The sliding path of the slider 5 on the splint 4 can be a straight line or a curve, as long as the slider 5 can drive the locking block 6 to slide during the sliding process.

[0062] The sliding connection between the slider 5 and the clamping plate 4 can be a guide rail and slider 5 matching form, or a shaft and sleeve matching form, or other matching forms that can achieve relative sliding. The sliding matching form has the characteristics of simple structure, easy assembly, and efficient transmission.

[0063] The slider 5 is directly connected to the second transmission member 8 , which can shorten the transmission distance from the operating member to the slider 5 , so that the slider 5 can respond to the closing operation more promptly and accurately, thereby increasing the closing speed.

[0064] The locking block 6 is also slidably installed on the splint 4, and the installation position of the locking block 6 is also located on the side of the first plate 41 away from the second plate 42. The sliding path of the locking block 6 on the splint 4 can also be a straight line or a curve. The cooperation between the sliding path of the locking block 6 and the sliding path of the slider 5 needs to satisfy the requirement that the locking block 6 can push the slider 5 to slide to the second abutment portion 62 and insert into the avoidance groove 321.

[0065] The sliding connection between the locking block 6 and the splint 4 can be the same as the slider 5, which adopts the matching form of the guide rail and the sliding block, or the matching form of the shaft and the sleeve, or other matching forms that can achieve relative sliding, with the same technical effect.

[0066] Reference Figures 1 to 5 The guide surface 531 provided on the slider 5 can abut against the contact end 61 provided on the locking block 6 during the sliding process, which can not only apply thrust to the contact end 61, but also slide relative to the contact end 61, so that the slider 5 and the locking block 6 always maintain abutment during their respective sliding processes.

[0067] The guiding direction of the guide surface 531 can be set to a direction away from the slider 5 or a direction toward the slider 5, both of which are intended to push the locking block 6 to the direction where the second abutting portion 62 is close to the avoidance groove 321. In this embodiment, the guiding direction of the guide surface 531 during the closing process is a direction away from the slider 5, so as to push the locking block 6 to slide away from the slider 5.

[0068] When performing the closing operation, the closing button in the control operating member is driven by the closing button to drive the first transmission member 7 to move, the first transmission member 7 drives the second transmission member 8, the second transmission member 8 drives the slider 5 to slide, the slider 5 pushes the lock block 6 to slide, and the second abutting portion 62 gradually approaches the avoidance groove 321 on the receiving portion 32. When the second abutting portion 62 slides to the notch of the avoidance groove 321, the pressing force applied by the second abutting portion 62 to the transmission rod 3 is instantly released, and the pressing force of the transmission rod 3 on the moving contact 2 is released at the same time. Under the action of the first elastic member 21, the moving contact 2 quickly engages with the static contact 1 to complete the closing. This form of coordination can avoid the influence of the operating speed on the closing speed. Regardless of whether the operating speed is fast or slow, the fast closing mechanism can ensure that the moving contact 2 engages with the static contact 1 at an appropriate speed, reducing the risk of each component being burned by the arc.

[0069] Reference Figures 2 to 6 In some examples, the slider 5 includes an integrally formed linkage portion 51 and a first sliding portion 52. The linkage portion 51 is provided with a waist-shaped hole 511. The second transmission member 8 passes through the waist-shaped hole 511 and selectively abuts against the hole wall to enable the slider 5 to slide in a straight line.

[0070] The slider 5 is manufactured using an integrated molding process, resulting in high structural strength. By providing a waist-shaped hole 511 in the linkage portion 51 of the slider 5, the second transmission member 8 extending through the waist-shaped hole 511 can not only drive the slider 5 by abutting against the hole wall, but can also transform the movement of the second transmission member 8 into linear sliding of the slider 5 by changing the abutment position. This helps improve the precision and reliability of the fit between the second transmission member 8 and the slider 5, and between the slider 5 and the locking block 6.

[0071] Reference Figure 6 The linkage portion 51 is provided at the first end of the slider 5, and the first sliding portion 52 is provided at the second end of the slider 5. The linkage portion 51 is wider than the first sliding portion 52, and the waist-shaped hole 511 is provided along the width direction of the linkage portion 51. The slider 5 is slidably connected to the clamping plate 4 via the first sliding portion 52, and the first sliding portion 52 slides linearly on the clamping plate 4, with the sliding direction being perpendicular to the width direction of the linkage portion 51.

[0072] In this embodiment, referring to Figure 2 and Figure 3 An arc-shaped through hole 43 is provided on the splint 4. The second transmission member 8 is installed in the arc-shaped through hole 43 and can move along an arc track in the arc-shaped through hole 43 under the drive of the first transmission member 7. The second transmission member 8 is arranged in this way mainly to cooperate with the rotation action of the first transmission member 7. The operating member is subjected to force to drive the first transmission member 7 to rotate, and the second transmission member 8 moves in an arc with the first transmission member 7.

[0073] The waist-shaped hole 511 on the linkage part 51 is connected to the arc-shaped through hole 43, and the second transmission member 8 passes through the arc-shaped through hole 43 and the waist-shaped hole 511. During the movement of the second transmission member 8, the second transmission member 8 drives the slider 5 to slide by pushing the wall of the waist-shaped hole 511, and the slider 5 maintains linear sliding under the action of the first sliding part 52. In this way, the second transmission member 8 can maintain relative movement in the arc-shaped through hole 43 and the waist-shaped hole 511 at the same time, avoiding the occurrence of a dead point of movement between the second transmission member 8 and the slider 5, and ensuring that the slider 5 can slide in a timely and smooth manner.

[0074] The length of the waist-shaped hole 511 determines the maximum stroke of the slider 5, while its width precisely matches the diameter of the second transmission member 8, ensuring smooth movement without excessive play. In actual assembly, the inner wall of the waist-shaped hole 511 can undergo special surface treatment (such as polishing or plating) to reduce friction and increase the service life of the moving parts. This conversion mechanism is more compact than traditional rack-and-pinion structures and is particularly suitable for achieving efficient and reliable motion conversion within the limited space of circuit breakers.

[0075] Reference Figures 6 to 8 In some examples, the first sliding portion 52 is provided with a first sliding groove 521 and a second sliding groove 522 relative to each other, and the splint 4 is provided with a third sliding groove 44 matching the first sliding portion 52. The first sliding groove 521 and the second sliding groove 522 are clamped on the inner wall of the third sliding groove 44 to form a bidirectional limited sliding pair.

[0076] The first slide groove 521 and the second slide groove 522 are arranged opposite to each other and cooperate with the third slide groove 44 at the same time to form a two-way limiting sliding pair structure between the first sliding part 52 and the splint 4. This structure can effectively prevent the slider 5 from deflecting or getting stuck during movement, and the two-way force design enables the slider 5 to obtain uniform guiding support during reciprocating motion, and can also improve the assembly accuracy and meet the requirements of the rapid closing mechanism for movement accuracy.

[0077] Specifically, refer to Figure 6 and Figure 7 The first and second chutes 521, 522 are symmetrically arranged on either side of the first sliding portion 52, and are arranged in a mirror-image manner, forming two precise guide channels on either side of the first sliding portion 52. Referring to the cross-sectional shape of the first sliding portion 52, its cross-sectional shape is an I-beam. A third chute 44 is machined on the corresponding clamping plate 4. The two opposing side walls of the third chute 44 correspond to the first and second chutes 521, 522, respectively. The two side walls are inserted into the first and second chutes 521, 522, respectively, and their shapes match those of the first and second chutes 521, 522, allowing the first sliding portion 52 to maintain linear sliding along the third chutes 44.

[0078] The contact surface 612 between the inner wall of the third chute 44 and the first and second chute 521, 522 is precision machined to a surface roughness of Ra 0.8 or less, ensuring smooth sliding. Furthermore, the contact surface 612 can be treated with special treatments, such as hard chrome plating or a wear-resistant coating, to enhance wear resistance and extend service life.

[0079] Furthermore, the sliding pair structure also takes assembly convenience into consideration. The openings of the first and second chutes 521, 522 are slightly larger than the raised portion of the third chute 44, and appropriate transition fit tolerances are employed to ensure both smooth insertion during assembly and precise fit during operation. This design not only improves production efficiency but also facilitates subsequent maintenance. In long-term testing, the sliding pair structure maintained excellent guiding accuracy after tens of thousands of reciprocating motions, fully demonstrating its reliability and durability.

[0080] Reference Figure 9 and Figure 10 In some examples, the locking block 6 includes an integrally formed contact end 61, a second sliding portion 63, and a second abutting portion 62. The contact end 61 includes an extension section 611 and a contact surface 612 provided at the end of the extension section 611. The slider 5 is provided with a guide boss 53, and a guide surface 531 is provided on the guide boss 53. An avoidance space 613 is formed between the extension section 611 and the second sliding portion 63. The guide boss 53 is adapted to the avoidance space 613, and the contact surface 612 is in contact with the guide surface 531.

[0081] The locking block 6 is manufactured using an integrated molding process, resulting in high structural strength. By providing an extension 611 on the contact end 61 to mate with the guide boss 53 on the slider 5, the clearance space 613 formed between the extension 611 and the second sliding portion 63 provides clearance for the guide boss 53 during sliding. This allows the guide boss 53 to maintain a constant push against the contact end 61, ensuring accurate and timely linkage between the slider 5 and the locking block 6, thereby improving the accuracy and reliability of the rapid closing mechanism.

[0082] Among them, reference Figure 9 and Figure 10 The contact end 61 is provided at the first end of the locking block 6, the second abutting portion 62 is provided at the second end of the locking block 6, and the second sliding portion 63 is provided in the middle of the locking block 6. An extension 611 in the contact end 61 extends away from the second sliding portion 63, and the extension 611 has a bend, forming a clearance space 613 between the bent extension 611 and the second sliding portion 63. A contact surface 612 is provided at the end of the extension 611 away from the second sliding portion 63. This arrangement facilitates abutment against the guide boss 53, thereby achieving a pushing effect of the slider 5 against the locking block 6.

[0083] The guide boss 53 is arranged in the middle position of the slider 5. The thickness of the guide boss 53 is thicker than that of the linkage part 51 and the first sliding part 52. The thickened guide boss 53 can effectively improve the structural strength and prevent the guide surface 531 from bending or being damaged to affect the pushing effect on the locking block 6.

[0084] Specifically, refer to Figure 9 The opening of the escape space 613 formed between the extension section 611 and the second sliding portion 63 faces the direction of the guide boss 53, and the raised end of the guide boss 53 faces the escape space 613. When in the open state, the contact end 61 abuts the starting end of the guide surface 531, while the distal end of the guide surface 531 is located at the raised end of the guide boss 53 closer to the locking block 6. At this time, the guide boss 53 can be perfectly positioned in the escape space 613. This structural coordination ensures sufficient margin of movement during movement while avoiding unnecessary space waste. During the closing process, the guide boss 53 can be used to push the contact end 61, causing the locking block 6 to slide away from the slider 5.

[0085] Reference Figure 9 In some examples, the contact surface 612 is configured as a curved surface, and the guide surface 531 is configured as an inclined surface. In another example, the contact surface 612 is configured as an inclined surface, and the guide surface 531 is configured as a curved surface.

[0086] By adopting the matching form of arc surface and inclined surface, the contact surface 612 and the guide surface 531 can always maintain the matching form of line-surface contact. During the relative sliding of the contact surface 612 and the guide surface 531, it can not only ensure that the guide surface 531 provides a stable push effect on the contact surface 612, but also reduce the friction between the guide surface 531 and the contact surface 612, so that the slider 5 and the locking block 6 can smoothly move relative to each other, thereby improving the stability of the rapid closing mechanism.

[0087] The first solution adopts an arc surface-bevel matching design, in which the contact surface 612 of the contact end 61 of the locking block 6 is processed into a precise arc surface, while the guide surface 531 of the guide boss 53 of the slider 5 is designed as an inclined plane. The advantage of this combination is that the arc surface contact can adaptively adjust the contact point position, while the bevel guide provides a stable guiding force, which is particularly suitable for high-frequency operation occasions.

[0088] The second solution utilizes a beveled-arc design, the opposite of the first. In this configuration, the contact surface 612 of the locking block 6 is replaced with an inclined plane, while the guide surface 531 is machined into a circular arc. This design features beveled contact for more direct thrust transmission, while the arc-shaped guide reduces sliding friction, making it more suitable for applications requiring greater operating force.

[0089] In actual applications, designers can flexibly choose according to specific needs: for small circuit breakers or situations requiring easy operation, the arc-bevel combination is recommended. For large circuit breakers or situations requiring greater operating force, the bevel-arc combination is more suitable.

[0090] Reference Figure 9 and Figure 10 In some examples, the second sliding portion 63 is provided with a through hole 631, a parallel first connecting plate 45 and a second connecting plate 46 are provided on the splint 4, a sliding rod 47 is provided between the first connecting plate 45 and the second connecting plate 46, and the second sliding portion 63 is slidably connected to the sliding rod 47 through the through hole 631.

[0091] The second sliding portion 63 and the splint 4 use a through hole 631 and a slide rod 47 in a matching form, which is similar to the common matching form of a sleeve and a shaft. This design form can ensure the smooth sliding of the locking block 6 while having the characteristics of simple structure, easy assembly and high stability, which is beneficial for the locking block 6 to smoothly complete the closing action during the closing process and ensure that the rapid closing mechanism is stable and reliable.

[0092] Specifically, refer to Figures 8 to 10 The through hole 631 is located in the middle of the second sliding portion 63, and the axis of the through hole 631 is aligned with the sliding direction of the locking block 6. The first connecting plate 45 and the second connecting plate 46 are both located on the side of the first plate 41 facing away from the second plate 42. The first connecting plate 45 and the second connecting plate 46 are arranged in parallel and symmetrically. The first connecting plate 45 is located on the side of the slider 5 facing away from the locking block 6, and the second connecting plate 46 is located on the side of the locking block 6 facing away from the slider 5. The first connecting plate 45 and the second connecting plate 46 can be integrally formed with the first plate 41, or they can be fixed to the first plate 41 using bolts or other fixing methods to form a stable support structure.

[0093] The ends of the slide rod 47 are fixed to the first connecting plate 45 and the second connecting plate 46 via threaded connections or press-fitting. The slide rod 47 can be configured as a square rod or a cylindrical rod. The through hole 631 of the second sliding portion 63 is sleeved onto the slide rod 47. The shape of the through hole 631 matches the shape of the slide rod 47 to form a stable sliding pair, allowing the locking block 6 to slide stably under the push of the slider 5.

[0094] In this embodiment, the slide bar 47 is configured as a cylindrical rod, and the through hole 631 is configured as a circular hole. This minimizes friction between the through hole 631 and the slide bar 47, allowing the locking block 6 to slide smoothly along the slide bar 47. Furthermore, the side of the locking block 6 close to the clamping plate 4 can maintain a small gap or contact with the clamping plate 4, thereby preventing the locking block 6 from rotating around the slide bar 47 and further improving assembly stability.

[0095] Reference Figures 8 to 10In some examples, a second elastic member 48 is provided on the slide rod 47, and the second elastic member 48 is located between the second sliding portion 63 and the second connecting plate 46. When the guide boss 53 pushes against the contact end 61, the second elastic member 48 is compressed to store energy.

[0096] The setting of the second elastic member 48 can maintain the compressed energy storage state during the closing process. The elastic force applied to the lock block 6 is opposite to the direction of the thrust applied by the slider 5 to the lock block 6, which is conducive to clamping the lock block 6 to prevent the lock block 6 from shaking or rotating. At the same time, the lock block 6 can be quickly pushed to reset during opening, so that the lock block 6 can abut and press the transmission rod 3 through the second abutting portion 62, so that the moving contact 2 and the static contact 1 remain in the opening state. This design is beneficial to the stability of the closing process and the maintenance of the opening state, effectively improving the overall reliability and practicality of the rapid closing mechanism.

[0097] The second elastic member 48 can be a compression spring or spring washer, or other elastic component. In this embodiment, a compression spring is used, which is sleeved onto the slide bar 47. One end of the second elastic member 48 abuts the end surface of the second sliding portion 63 near the second connecting plate 46, while the other end contacts the inner surface of the second connecting plate 46. In its natural state, it maintains a slight pre-compression. This pre-compression design ensures that the locking block 6 is always elastically forced toward its initial position, eliminating play.

[0098] Reference Figures 8 to 10 In some examples, the splint 4 is further provided with a limiting boss 49, which is located between the slider 5 and the locking block 6. The second sliding portion 63 is further provided with a limiting groove 632, and the limiting boss 49 is plugged into the limiting groove 632 to constrain the travel of the locking block 6.

[0099] The setting of the limiting boss 49 can cooperate with the limiting groove 632 to limit the distance between the locking block 6 and the slider 5, preventing the contact surface 612 and the guide surface 531 from being in close contact in the open state, and retaining a certain gap between the two. This can reduce the force required in the initial stage of closing the switch, facilitate smooth closing operations, and help improve the operational convenience of the rapid closing mechanism.

[0100] Specifically, the limiting boss 49 is provided on the side of the first plate 41 of the clamping plate 4 facing away from the second plate 42, and the limiting boss 49 is located between the locking block 6 and the slider 5. The limiting groove 632 is provided on the side of the second sliding portion 63 close to the slider 5, and the shape of the limiting groove 632 matches the shape of the limiting boss 49.

[0101] In the open state, the second sliding portion 63 has a movement tendency to approach the slider 5 under the action of the second elastic member 48. At this time, the second sliding portion 63 slides to the limiting groove 632 and engages with the limiting boss 49, thereby limiting the locking block 6 from further approaching the slider 5. This allows the contact end 61 to maintain a gap with the guide boss 53 in the open state, so that at the moment of just closing the switch, no additional friction is generated between the guide boss 53 and the contact end 61, which is beneficial to saving closing force and facilitating closing.

[0102] Reference Figure 9 In some examples, the side of the second abutting portion 62 close to the transmission rod 3 is set to be an arc surface.

[0103] Setting the second abutment portion 62 as an arc surface can keep the contact between the second abutment portion 62 and the transmission rod 3 as line-surface contact, which does not affect the clamping force exerted by the second abutment portion 62 on the transmission rod 3 and can also reduce the friction between the second abutment portion 62 and the transmission rod 3, so that the second abutment portion 62 and the transmission rod 3 can slide relative to each other smoothly, which is conducive to the smooth operation of the quick closing mechanism.

[0104] In an optional embodiment, an arc surface can be provided on the surface of the receiving portion 32 of the transmission rod 3, and the bending direction of the arc surface is toward the avoidance groove 321, and the side of the second abutment portion 62 close to the transmission rod 3 can be set to a plane or an arc surface. This setting form is conducive to the second abutment portion 62 sliding smoothly to the position of the avoidance groove 321, which is conducive to the cooperation between the locking block 6 and the transmission rod 3 in the later stage of closing the switch, thereby ensuring the smooth closing of the switch.

[0105] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A fast closing mechanism, characterized in that: Applied to a circuit breaker, the circuit breaker includes a static contact and a moving contact, the moving contact is pre-tightened in a direction away from the static contact by a first elastic member, and the rapid closing mechanism includes: a transmission rod, provided on a side of the static contact away from the moving contact, the transmission rod comprising: a first abutting portion and a receiving portion, the first abutting portion being used to abut the moving contact and compress the first elastic member, the receiving portion being provided with an avoidance groove; A clamping plate is provided with a first transmission member and a second transmission member connected to each other; A slider, slidably mounted on the clamping plate and connected to the second transmission member, wherein the slider is provided with a guide surface; A locking block is slidably provided on the clamping plate, the locking block comprising: a contact end and a second abutting portion, the contact end is slidably engaged with the guide surface, and the second abutting portion abuts against the receiving portion; When closing the circuit breaker, the first transmission member is driven by an external force, and the slider is driven to slide through the second transmission member. The guide surface pushes the contact end to make the locking block slide to the second abutment portion and insert into the avoidance groove. The first abutment portion disengages from the moving contact, and the first elastic member is released and pushes the moving contact to quickly close the static contact.

2. The rapid closing mechanism according to claim 1, characterized in that: The slider includes an integrally formed linkage portion and a first sliding portion. The linkage portion is provided with a waist-shaped hole. The second transmission member passes through the waist-shaped hole and selectively abuts against the hole wall to enable the slider to slide in a straight line.

3. The rapid closing mechanism according to claim 2, characterized in that: The first sliding portion is provided with a first sliding groove and a second sliding groove relative to each other, and the splint is provided with a third sliding groove matching the first sliding portion. The first sliding groove and the second sliding groove are clamped on the inner wall of the third sliding groove to form a bidirectional limiting sliding pair.

4. The rapid closing mechanism according to any one of claims 1 to 3, characterized in that: The locking block includes an integrally formed contact end, a second sliding portion and a second abutting portion, the contact end includes an extension section and a contact surface arranged at the end of the extension section, the slider is provided with a guide boss, the guide surface is arranged on the guide boss, an avoidance space is formed between the extension section and the second sliding portion, the guide boss is adapted to the avoidance space, and the contact surface is in contact with the guide surface.

5. The rapid closing mechanism according to claim 4, characterized in that: The contact surface is configured as a curved surface, and the guide surface is configured as an inclined surface; Alternatively, the contact surface is configured as an inclined surface, and the guide surface is configured as an arc surface.

6. The rapid closing mechanism according to claim 4, characterized in that: The second sliding portion is provided with a through hole, the clamping plate is provided with a first connecting plate and a second connecting plate which are parallel to each other, a sliding rod is provided between the first connecting plate and the second connecting plate, and the second sliding portion is slidably connected to the sliding rod through the through hole.

7. The rapid closing mechanism according to claim 6, characterized in that: A second elastic member is provided on the sliding rod, and the second elastic member is located between the second sliding portion and the second connecting plate. When the guide boss pushes the contact end, the second elastic member is compressed to store energy.

8. The rapid closing mechanism according to claim 4, characterized in that: The clamping plate is further provided with a limiting boss, which is located between the sliding block and the locking block. The second sliding portion is further provided with a limiting groove, and the limiting boss is plugged into and matched with the limiting groove to constrain the travel of the locking block.

9. The rapid closing mechanism according to claim 1, characterized in that: A side of the second abutting portion close to the transmission rod is configured as an arc surface.

10. A circuit breaker, characterized in that: It comprises a static contact, a moving contact and a rapid closing mechanism according to any one of claims 1 to 9, wherein the moving contact is pre-tightened in a direction away from the static contact by a first elastic member, and the rapid closing mechanism is connected to the moving contact.

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