Quick switching-on mechanism and circuit breaker

Abstract

The invention discloses a rapid switching-on mechanism and a circuit breaker, and relates to the technical field of circuit breakers, the rapid switching-on mechanism comprises a static contact and a moving contact, and the moving contact is pre-tightened in the direction away from the static contact through a first elastic piece. The transmission rod is arranged on the side, away from the moving contact, of the static contact and comprises a first abutting part and a bearing part, the first abutting part is used for abutting against the moving contact and compressing the first elastic piece, and the bearing part is provided with an avoiding groove. The clamping plate is provided with a first transmission part and a second transmission part which are connected with each other. The sliding block is arranged on the clamping plate in a sliding mode and connected with the second transmission piece, and a guide face is arranged on the sliding block. The locking block is arranged on the clamping plate in a sliding mode and comprises a contact end and a second abutting part, the contact end is in sliding fit with the guide face, and the second abutting part abuts against the bearing part. According to the rapid closing mechanism and the circuit breaker, the closing process can be accelerated, and the influence of electric arcs generated in the closing process on all parts of the circuit breaker is reduced.

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] Motor circuit breaker is a circuit breaker specially used to protect motors. It can protect motors from overload, short circuit, phase loss and other faults. During the opening and closing process of the motor circuit breaker, an arc will be generated between the moving contact and the static contact. If the arc exists for a long time, it is easy to burn the surrounding parts.

[0003] Existing motor circuit breakers are usually provided with a fast opening mechanism, which can use the energy storage spring to quickly release energy to separate the moving contact from the static contact when opening is required, so as to speed up the arc extinguishing 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, wherein 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 clamping plate, 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 clamping plate is installed with a first transmission member and a second transmission member connected to each other. The slider is slidably arranged on the clamping plate and connected to the second transmission member, and a guide surface is provided on the slider. The locking block is slidably arranged on the clamping plate, and includes: a contact end and a second abutting portion, the contact end is slidably matched 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 releases and pushes the moving contact to quickly close the static contact.

[0008] By arranging a slider and a locking block on the clamping plate, the locking block can be used to first press the transmission rod at the initial stage of closing, so that the moving contact remains stationary at the initial stage of closing, and then the slider can be used to push the locking block during the closing process. When the closing action is about to end, the locking block is pushed to the second abutment portion and inserted into the avoidance groove of the transmission rod to release the pressing force of the locking block on the transmission rod, so that the first elastic member can be instantly released and push the moving contact to quickly engage with the static contact. 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 arcs.

[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, so that the slider slides in a straight line.

[0010] The slider is manufactured by an integrated molding process and has a high structural strength. By setting a waist-shaped hole on the linkage part of the slider, the second transmission member running through the waist-shaped hole can not only drive the slider to slide by abutting the hole wall, but also change the abutting position to transform the action form of the second transmission member into a linear sliding of the slider, which is beneficial to improve the matching accuracy and reliability 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 clamping plate 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 that are relatively arranged 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 clamping plate. The use of 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 guiding support during reciprocating motion, and can also improve assembly accuracy and meet the requirements of the rapid closing mechanism for motion 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 arranged at the end of the extension section, the sliding block 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.

[0014] The lock block is manufactured by an integrated molding process and has a high structural strength. By providing an extension section on the contact end to match the guide boss provided on the slider, the avoidance space formed between the extension section and the second sliding portion can play an avoidance role for the guide boss during the sliding process, so that the guide boss can always maintain a push effect on the contact end, ensuring accurate and timely linkage between the slider and the lock block, so as to improve the accuracy and reliability of the quick 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] By adopting the matching form of arc surface and inclined surface, the contact surface and the guide surface can always maintain the matching form of 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 effect on the contact surface, but also reduce the friction between the guide surface and the contact surface, so that the slider and the locking 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 clamping plate is provided with a first connecting plate and a second connecting plate in parallel, 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 clamping plate adopt the cooperation form of through hole and sliding rod, which is similar to the cooperation form of common bushing and shaft. This design form can ensure the smooth sliding of the locking block while having the characteristics of simple structure, convenient 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 slide 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 beneficial 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 is beneficial to maintaining the opening state, effectively improving the overall reliability and practicality of the rapid closing mechanism.

[0021] In some examples, the clamping plate is further provided with a limiting boss, the limiting boss 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.

[0022] The setting of the limit boss can cooperate with the limit groove to limit the distance between the locking block and the slider, preventing the contact surface and the guide surface from being in close contact in the open state. A certain gap is retained between the two, which can reduce the force required in the initial stage of closing the switch, 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 a curved 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 applied by the second abutment portion to 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 the present application can effectively increase the closing speed of the circuit breaker and 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 drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of the fast closing mechanism provided in the embodiment of the present application in the open state; Figure 2 A schematic diagram of the structure of the lock block and the slider cooperating in the open state of the fast closing mechanism provided in an embodiment of the present application; 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; Figure 4 A schematic diagram of the structure of the fast closing mechanism provided in an embodiment of the present application in a closed state; Figure 5 A schematic diagram of the structure of the lock block and the slider in the closed state of the fast closing mechanism provided in an embodiment of the present application; Figure 6 A schematic diagram of the structure of a slider provided in an embodiment of the present application; Figure 7 A schematic diagram of the structure of a splint provided in an embodiment of the present application; Figure 8 A schematic diagram of a structure in which a slider and a locking block provided in an embodiment of the present application are slidably installed on a clamping plate; Fig. 9 A schematic diagram of the structure of a lock block provided in an embodiment of the present application; Fig.10 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.

[0029] Description of reference numerals: 1, stationary 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 slide groove; 45, first connecting plate; 46, second connecting plate; 47, slide rod; 48, second elastic member; 49, limiting boss; 5, slide block; 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

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] 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, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Existing motor circuit breakers are usually provided with a fast opening mechanism, that is, the characteristics of the mechanism can be used to quickly separate the moving contact and the static contact during opening, so as to accelerate the extinguishing of the arc and reduce the harm caused by the existence of the arc.

[0036] In the closing process of the existing motor circuit breaker, the operator needs to operate the closing button or knob and other operating parts, and then drive the moving contact to approach and engage the static contact through the transmission mechanism to complete the closing. Since the operation speed is usually slow, the closing speed is also slow, resulting in the arc generated during the closing process existing for too long, affecting the safe use of the motor circuit breaker.

[0037] 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.

[0038] 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 in conjunction with the accompanying drawings.

[0039] 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 1 An 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.

[0040] The static contact 1 is fixedly installed, and the moving contact 2 is movably installed at a position close to the static contact 1. The first elastic member 21 is arranged on the side of the moving contact 2 away from the static contact 1, and the first elastic member 21 can be arranged as a compression spring or a spring washer or other elastic structural member. When the circuit breaker is in the open state, the first elastic member 21 is in a compressed state, and when closing the circuit breaker, the elastic force of the first elastic member 21 can push the push contact 2 to engage the static contact 1 to complete the closing.

[0041] 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 exist for too long, thereby improving the closing speed, reliability and safety of use of the circuit breaker, which is beneficial to increasing the service life of the circuit breaker.

[0042] Please refer to Figures 1 to 5 This embodiment provides a quick closing mechanism, including a transmission rod 3, a clamping plate 4, a slider 5 and a locking block 6.

[0043] 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 .

[0044] The clamping plate 4 is provided with a first transmission member 7 and a second transmission member 8 which are connected to each other.

[0045] The slider 5 is slidably disposed 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 disposed on the clamping plate 4. The slider 5 includes a contact end 61 and a second abutting portion 62. The contact end 61 is slidably matched with the guide surface 531. The second abutting portion 62 abuts against the receiving portion 32.

[0046] When closing the circuit breaker, the first transmission member 7 is driven by an external force, and drives the slider 5 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 releases and pushes the moving contact 2 to quickly close the static contact 1.

[0047] By arranging the slider 5 and the lock block 6 on the clamping plate 4, the lock block 6 can be used to first press the transmission rod 3 at the initial stage of closing, so that the moving contact 2 remains stationary at the initial stage of closing, and then the slider 5 pushes the lock block 6 during the closing process. When the closing action is about to end, the lock block 6 is pushed to the second abutment portion 62 and inserted into the avoidance groove 321 of the transmission rod 3, and the pressing force of the lock block 6 on the transmission rod 3 is released, 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 form can significantly speed up the closing speed, avoid being affected by the operating speed, and effectively reduce the risk of damage caused by the arc existing for a long time during the closing process.

[0048] 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.

[0049] 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.

[0050] 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 , so that the second abutting portion 62 is easily inserted into the avoidance groove 321 .

[0051] Reference Figure 2 and Figure 3 The clamping plate 4 includes a first plate 41 and a second plate 42 which are 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 to transmit the closing force of the operator's control operating member to the first transmission member 7, and then to the second transmission member 8 from the first transmission member 7.

[0052] The slider 5 is slidably mounted on the clamping plate 4, specifically, slidably mounted on the side of the first plate 41 away from the second plate 42. The sliding path of the slider 5 on the clamping plate 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.

[0053] The sliding connection between the slider 5 and the clamping plate 4 can be in the form of a guide rail and the slider 5, or in the form of a shaft and a sleeve, or in other forms of relative sliding. The sliding fit has the characteristics of simple structure, convenient assembly, and efficient transmission.

[0054] 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, so as to increase the closing speed.

[0055] The locking block 6 is also slidably installed on the clamping plate 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 clamping plate 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.

[0056] The sliding connection between the locking block 6 and the clamping plate 4 can be the same as the slider 5, which can be in the form of a guide rail and a sliding block, or in the form of a shaft and a sleeve, or in other forms of relative sliding, with the same technical effect.

[0057] 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.

[0058] The guiding direction of the guide surface 531 can be set to a direction away from the slider 5 or a direction close to the slider 5, both of which are intended to push the lock 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 lock block 6 to slide in a direction away from the slider 5.

[0059] 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 abutment portion 62 gradually approaches the avoidance groove 321 on the receiving portion 32. When the second abutment portion 62 slides to the notch of the avoidance groove 321, the pressing force applied by the second abutment 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 matching form 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.

[0060] 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, so that the slider 5 slides in a straight line.

[0061] The slider 5 is manufactured by an integrated molding process and has a high structural strength. By providing a waist-shaped hole 511 on the linkage portion 51 of the slider 5, the second transmission member 8 passing through the waist-shaped hole 511 can not only drive the slider 5 to slide by abutting against the hole wall, but also change the abutting position to change the action form of the second transmission member 8 into a linear sliding of the slider 5, which is beneficial to improve the matching accuracy and reliability between the second transmission member 8 and the slider 5, and between the slider 5 and the locking block 6.

[0062] Reference Figure 6 The linkage part 51 is arranged at the first end of the slider 5, and the first sliding part 52 is arranged at the second end of the slider 5. The linkage part 51 is wider than the first sliding part 52, and the waist-shaped hole 511 is arranged along the width direction of the linkage part 51. The slider 5 is slidably connected with the clamping plate 4 through the first sliding part 52, and the first sliding part 52 slides linearly on the clamping plate 4, and the sliding direction is perpendicular to the width direction of the linkage part 51.

[0063] In this embodiment, refer to Figure 2 and Figure 3 An arc-shaped through hole 43 is provided on the clamping plate 4, and the second transmission member 8 is installed in the arc-shaped through hole 43 and can move along an arc-shaped trajectory 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.

[0064] 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 against 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.

[0065] The length of the waist-shaped hole 511 determines the maximum stroke of the slider 5, while the width is precisely matched with the diameter of the second transmission member 8, ensuring that there is no excessive gap during the movement and that the movement is smooth. In actual assembly, the inner wall of the waist-shaped hole 511 can be subjected to special surface treatment (such as polishing or plating) to reduce the friction coefficient and increase the service life of the moving parts. This conversion mechanism is more compact than the traditional gear rack structure and is particularly suitable for realizing efficient and reliable motion conversion in the limited space of the circuit breaker.

[0066] 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, and 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 limiting sliding pair.

[0067] The first slide groove 521 and the second slide groove 522 which are arranged opposite to each other cooperate with the third slide groove 44 at the same time, and a bidirectional limiting sliding pair structure can be formed between the first sliding part 52 and the clamping plate 4. The use of this structure can effectively prevent the slider 5 from deflecting or getting stuck during the movement, and the bidirectional force design enables the slider 5 to obtain uniform guiding support during the reciprocating motion, and can also improve the assembly accuracy, and meet the requirements of the rapid closing mechanism for the movement accuracy.

[0068] Specifically, refer to Figure 6 and Figure 7 The first slide groove 521 and the second slide groove 522 are symmetrically arranged on both sides of the first sliding part 52, and the two are distributed in a mirror-symmetrical manner to form two precise guide channels on both sides of the first sliding part 52. Referring to the cross-sectional shape of the first sliding part 52, its cross-sectional shape is an I-shaped. The third slide groove 44 is processed on the clamping plate 4 that cooperates with it. The two opposite side walls of the third slide groove 44 correspond to the first slide groove 521 and the second slide groove 522 respectively. The two side walls are respectively inserted into the first slide groove 521 and the second slide groove 522, and the shapes of the two side walls match the shapes of the first slide groove 521 and the second slide groove 522, so that the first sliding part 52 can maintain a straight line slide along the third slide groove 44.

[0069] The contact surface 612 between the inner wall of the third slide groove 44 and the first slide groove 521 and the second slide groove 522 is precisely machined, and the surface roughness is controlled within Ra0.8 to ensure smooth sliding. At the same time, the contact surface 612 can be treated with special processing, such as hard chrome plating or coating with wear-resistant coating, to enhance wear resistance and extend service life.

[0070] In addition, the sliding pair structure also takes assembly convenience into consideration. The opening size of the first slide groove 521 and the second slide groove 522 is slightly larger than the protruding part of the third slide groove 44, and an appropriate transition fit tolerance is adopted to ensure smooth introduction during assembly and precise fit during operation. This design not only improves production efficiency, but also facilitates later maintenance. In long-term use tests, the sliding pair structure can still maintain good guiding accuracy after tens of thousands of reciprocating motions, which fully verifies its reliability and durability.

[0071] Reference Fig. 9 and Fig.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 arranged at the end of the extension section 611, the slider 5 is provided with a guide boss 53, the guide surface 531 is arranged 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.

[0072] The lock block 6 is manufactured by an integrated molding process and has a high structural strength. By providing an extension section 611 on the contact end 61 to cooperate with the guide boss 53 provided on the slider 5, the avoidance space 613 formed between the extension section 611 and the second sliding portion 63 can play an avoidance role for the guide boss 53 during the sliding process, so that the guide boss 53 can always maintain a push effect on the contact end 61, ensuring accurate and timely linkage between the slider 5 and the lock block 6, so as to improve the accuracy and reliability of the quick closing mechanism.

[0073] Among them, refer to Fig. 9 and Fig.10 The contact end 61 is arranged at the first end of the locking block 6, the second abutting portion 62 is arranged at the second end of the locking block 6, and the second sliding portion 63 is arranged at the middle position of the locking block 6. The extension section 611 in the contact end 61 extends in a direction away from the second sliding portion 63 based on the second sliding portion 63, and the extension section 611 has a bent portion, and an escape space 613 is formed between the bent extension section 611 and the second sliding portion 63. The contact surface 612 is arranged at the end of the extension section 611 away from the second sliding portion 63, so that it is easy to abut against the guide boss 53, so as to achieve the effect of the slider 5 pushing the locking block 6.

[0074] 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.

[0075] Specifically, refer to Fig. 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 against the starting end of the guide surface 531, and the 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 just located in the escape space 613. The use of this structural coordination not only ensures sufficient margin of movement during the movement, but also avoids unnecessary space waste, and facilitates the use of the guide boss 53 to push the contact end 61 during the closing process, so that the locking block 6 slides in the direction away from the slider 5.

[0076] Reference Fig. 9 In some examples, the contact surface 612 is set as a curved surface, and the guide surface 531 is set as an inclined surface. In another example, the contact surface 612 is set as an inclined surface, and the guide surface 531 is set as a curved surface.

[0077] 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 ensure that the guide surface 531 provides a stable push effect on the contact surface 612, and 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 quick closing mechanism.

[0078] The first solution adopts an arc-bevel matching design, in which the contact surface 612 of the contact end 61 of the locking block 6 is processed as a precise arc surface, and 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, and the bevel guide provides a stable guiding force, which is particularly suitable for high-frequency operation occasions.

[0079] The second solution adopts a bevel-arc surface matching design, which is exactly the opposite of the first solution. In this configuration, the contact surface 612 of the locking block 6 is changed to an inclined plane, and the guide surface 531 is processed into an arc surface. The characteristics of this design are that the bevel contact can provide more direct thrust transmission, and the arc surface guide reduces sliding friction, which is more suitable for application scenarios that require greater operating force.

[0080] In actual applications, designers can flexibly choose according to specific needs: for small circuit breakers or occasions requiring light operation, the arc-bevel combination is recommended. For large circuit breakers or occasions that need to withstand greater operating forces, the bevel-arc combination is more suitable.

[0081] Reference Fig. 9 and Fig.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.

[0082] The second sliding portion 63 and the clamping plate 4 use a through hole 631 and a sliding rod 47 in a matching form, which is similar to the common matching form of a sleeve and a shaft. This design can ensure that the locking block 6 slides smoothly 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.

[0083] Specifically, refer to Figures 8 to 10 The through hole 631 is opened in the middle of the second sliding part 63, and the axis of the through hole 631 is in the same straight line 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 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 away from the locking block 6, and the second connecting plate 46 is located on the side of the locking block 6 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 can be fixed to the first plate 41 by bolts or other fixing methods to form a stable supporting structure.

[0084] The two ends of the slide bar 47 are fixed to the first connecting plate 45 and the second connecting plate 46 by threaded connection or press fitting. The slide bar 47 can be set as a square bar or a cylindrical bar. The through hole 631 of the second sliding part 63 is sleeved on the slide bar 47. The shape of the through hole 631 matches the shape of the slide bar 47 to form a stable sliding pair, so that the locking block 6 can slide stably under the push of the slider 5.

[0085] In this embodiment, the slide bar 47 is configured as a cylindrical rod, and the through hole 631 is configured as a round hole, so that the friction between the through hole 631 and the slide bar 47 can be reduced as much as possible, so that the locking block 6 can slide smoothly along the slide bar 47. At the same time, the side of the locking block 6 close to the clamping plate 4 can maintain a small gap with the clamping plate 4 or contact each other, so that the locking block 6 can be prevented from rotating around the slide bar 47, further improving the assembly stability.

[0086] 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.

[0087] 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 in the opposite direction to the thrust force applied by the slider 5 to the lock block 6, which is beneficial 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 when opening the switch, so that the lock block 6 can abut and press the transmission rod 3 through the second abutment 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 is also beneficial to the maintenance of the opening state, effectively improving the overall reliability and practicality of the rapid closing mechanism.

[0088] The second elastic member 48 can be a compression spring or a spring washer or other elastic part. In this embodiment, a compression spring is used, and the compression spring is sleeved on the slide bar 47. One end of the second elastic member 48 abuts against the end surface of the second sliding portion 63 close to the second connecting plate 46, and the other end contacts the inner plane of the second connecting plate 46, maintaining a slight pre-compression in a natural state. This pre-compression design ensures that the locking block 6 is always subjected to an elastic force toward the initial position, eliminating the movement gap.

[0089] Reference Figures 8 to 10 In some examples, the clamping plate 4 is further provided with a limiting boss 49, which is located between the slider 5 and the locking block 6, and the second sliding portion 63 is further provided with a limiting groove 632, which is plugged into and matched with the limiting groove 632 to constrain the travel of the locking block 6.

[0090] 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 the smooth closing operation, and help improve the operational convenience of the quick closing mechanism.

[0091] Specifically, the limiting boss 49 is arranged on the side of the first plate 41 of the clamping plate 4 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 arranged 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.

[0092] 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 limit groove 632 and engages with the limit 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.

[0093] Reference Fig. 9 In some examples, a side of the second abutting portion 62 close to the transmission rod 3 is set as a curved surface.

[0094] 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 not only does not affect the clamping force applied by the second abutment portion 62 to the transmission rod 3, but also reduces 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.

[0095] In an optional embodiment, an arc surface can be set 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 smooth sliding of the second abutment portion 62 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.

[0096] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fast closing mechanism, characterized in that: Applied to a circuit breaker, the circuit breaker comprises 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 fast closing mechanism comprises: A transmission rod is arranged on a side of the static contact away from the moving contact, the transmission rod comprises: 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; A clamping plate is provided with a first transmission member and a second transmission member connected to each other; A slider, slidably disposed 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 disposed on the clamping plate, the locking block comprising: a contact end and a second abutting portion, the contact end is slidably matched 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 is separated 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, so that the slider slides along a straight line.

3. The rapid closing mechanism according to claim 2, characterized in that: The first sliding part is provided with a first sliding groove and a second sliding groove relative to each other, the clamping plate is provided with a third sliding groove matching the first sliding part, 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.

4. The fast 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 sliding block 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; Or the contact surface is set as an inclined surface, and the guide surface is set as a curved surface.

6. The rapid closing mechanism according to claim 4, characterized in that: The second sliding part 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 part is slidably connected to the sliding rod through the through hole.

7. The rapid closing mechanism according to claim 6, characterized in that: The sliding rod is provided with a second elastic member, 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.

8. The rapid closing mechanism according to claim 4, characterized in that: The clamping plate is also provided with a limiting boss, and the limiting boss is located between the sliding block and the locking block. The second sliding part is also provided with a limiting groove, and the limiting boss is plugged 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 as claimed in 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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