Driving structure of closing resistor and circuit breaker
The driving structure of the closing resistor uses magnetic attraction and a telescopic mechanism to address wear issues, enhancing reliability and durability by accelerating contact closure and delaying opening, ensuring efficient operation.
Patent Information
- Application Number
- CN202410955193.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2044-07-17
AI Technical Summary
The reliability of the driving structure of the closing resistor in circuit breakers is compromised due to wear in the clamping part of the spring-based clamping structure, affecting the performance and longevity of the closing resistor.
A driving structure utilizing magnetic attraction between magnets and a telescopic connecting member, combined with a reset drive mechanism, ensures reliable operation of the closing resistor by accelerating the contact closure and delaying the contact opening, minimizing wear and ensuring quick disconnection.
The magnetic attraction and telescopic mechanism enhance the reliability and durability of the closing resistor, reducing wear and ensuring efficient operation by accelerating contact closure and delaying opening, thereby improving the circuit breaker's performance.
Smart Images
Figure CN118507314B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electrical switches, and in particular to a driving structure of a closing resistor and a circuit breaker. Background Art
[0002] The closing resistor is a resistor connected between the circuit breaker breaks through the auxiliary contacts, which is mainly used to limit the closing overvoltage and excitation surge current. The implementation principle of the closing resistor is that when the circuit breaker is closed, the joint closing resistor is put into use for a certain time (usually several milliseconds) before the main break of the arc extinguishing chamber is closed to suppress the closing surge current and overvoltage, and is automatically cut off or short-circuited several milliseconds after the main break of the arc extinguishing chamber is closed.
[0003] The closing resistor usually needs to be driven by a special driving structure. The driving structure of the closing resistor in the prior art usually includes a spring-based clamping structure. During long-term use, when the clamping part of the clamping structure is worn, the reliability of the driving structure is easily affected. Summary of the invention
[0004] In order to improve the reliability of a driving structure of a closing resistor of a circuit breaker, the present application provides a driving structure of a closing resistor and a circuit breaker.
[0005] The driving structure of the closing resistor and the circuit breaker provided in this application adopt the following technical solutions:
[0006] The driving structure of the closing resistor comprises a static contact connector, a movable moving contact connector and a fixed moving contact connector, wherein the static contact connector is used to connect the static contact of the circuit breaker, and the fixed moving contact connector is used to connect the moving contact of the circuit breaker; the movable moving contact connector is provided with a conductive rod, and the conductive rod can form a sliding contact with the fixed moving contact connector, and the fixed moving contact connector is located on the side of the movable moving contact connector away from the static contact connector; the movable moving contact connector is provided with a reset driving member, and the reset driving member is used to force the movable moving contact connector to approach the fixed moving contact connector; a telescopic connecting member is connected between the movable moving contact connector and the fixed moving contact connector, and the telescopic connecting member is an insulating member, and the fixed moving contact connector can be connected to the movable moving contact connector through a pole The telescopic connection piece in the limited contraction state drives the moving contact movable connection piece close to the moving contact fixed connection piece, and the moving contact fixed connection piece can drive the moving contact movable connection piece away from the moving contact fixed connection piece through the telescopic connection piece in the extreme extension state; the moving contact movable connection piece is provided with a first magnet, and the static contact connection piece is provided with a second magnet; when the moving contact movable connection piece moves toward the static contact connection piece, the magnetic attraction force between the first magnet and the second magnet can drive the moving contact movable connection piece away from the moving contact fixed connection piece; when the first magnet and the second magnet are at the maximum separation distance, the magnetic attraction force between the first magnet and the second magnet is less than the force of the reset drive piece on the moving contact movable connection piece.
[0007] By adopting the above technical solution, when the circuit breaker performs the closing action, the moving contact of the circuit breaker moves toward the static contact. At the same time, the moving contact movable connector and the moving contact fixed connector move toward the static contact connector. As the moving contact movable connector gradually approaches the static contact connector, the magnetic attraction between the first magnet and the second magnet gradually increases, so that the moving contact movable connector overcomes the obstruction of the reset drive and accelerates to approach and abut against the static contact connector. Due to the magnetic attraction between the first magnet and the second magnet, the movement of the moving contact movable connector is accelerated, so that the moving and static contacts of the closing resistor can be turned on before the moving and static contacts of the circuit breaker through the conductive rod, so that the closing resistor can play a role. When the circuit breaker performs the opening action, the moving contact fixed connector drives the moving contact movable connector to leave the static contact connector through the telescopic connector, and at the same time, the magnetic attraction between the first magnet and the second magnet gradually decreases, so that the reset drive can force the moving contact movable connector to retreat and reset.
[0008] In contrast, when the circuit breaker is opened, under the action of the magnetic attraction of the first magnet and the second magnet, the moving and static contacts of the closing resistor are delayed in opening, which is beneficial to reduce the overvoltage during opening.
[0009] The closing resistor is connected and put into operation by utilizing the magnetic attraction between the first magnet and the second magnet, and the problem of wear of the transmission connection part is not likely to occur, which is beneficial to ensuring the reliability of the closing resistor.
[0010] Optionally, the reset drive member is a coil spring, one end of the coil spring is connected to the movable contact connecting member, and the other end of the coil spring is connected to the movable contact connecting member.
[0011] By adopting the above technical solution, when the movable contact connecting piece and the movable contact fixed connecting piece move toward the stationary contact connecting piece, the magnetic attraction between the first magnet and the second magnet gradually increases, thereby overcoming the obstruction of the coil spring, so that the movable contact connecting piece accelerates to move closer to the stationary contact connecting piece. When the movable contact connecting piece is separated from the stationary contact connecting piece, the elastic deformation force of the coil spring forces the movable contact connecting piece to move and reset in the direction close to the movable contact fixed connecting piece.
[0012] Optionally, the telescopic connecting member includes a first sliding rod, a second sliding rod and a limiting structure, the first sliding rod and the second sliding rod are parallel to each other and slidably connected, the first sliding rod is fixedly connected to the moving contact movable connecting member, the second sliding rod is fixedly connected to the moving contact fixed connecting member, and the limiting structure is used to prevent the first sliding rod and the second sliding rod from separating from each other, and the second sliding rod can drive the first sliding rod through the limiting structure.
[0013] By adopting the above technical solution, when the circuit breaker is opened, the moving contact fixed connection piece drives the moving contact movable connection piece through the telescopic connection piece, that is, the moving contact fixed connection piece drives the first slide bar by means of the second slide bar and the limiting structure, and the first slide bar is slidably connected with the second slide bar, so that the telescopic connection piece can guide the movement of the moving contact movable connection piece.
[0014] Optionally, the first slide rod is a tubular structure, the first slide rod is sleeved on the second slide rod, the peripheral wall of the first slide rod is provided with a slit extending along the axial direction, and the end of the slit away from the movable connecting piece of the moving contact is a closed end; the second slide rod is fixedly provided with a limit pin, the limit pin passes through the slit, and the limit pin and the inner surface of the end of the slit away from the movable connecting piece of the moving contact jointly form a limiting effect on the first slide rod and the second slide rod.
[0015] By adopting the above technical solution, the purpose of limiting is achieved between the first slide bar and the second slide bar through the slit and the limit pin, that is, the limit pin and the inner surface of the slit are combined as a limiting structure, which has a simple structure and is easy to install.
[0016] Optionally, an insulating zone is provided on the outer peripheral surface of the conductive rod, the length of the insulating zone is smaller than the total length of the conductive rod, and a spacing is left between the insulating zone and the end of the conductive rod. When the moving contact fixed connector and the static contact connector are in a minimum spacing state, the conductive rod is insulated from the moving contact fixed connector through the insulating zone.
[0017] By adopting the above technical solution, after the circuit breaker is closed in place, when the moving contact fixed connector and the static contact connector are in a minimum spacing state, the conductive rod and the moving contact fixed connector are disconnected from the electrical connection state, so that the closing resistor is quickly disconnected after the circuit breaker is closed.
[0018] Optionally, the conductive rod is a telescopic rod, and the overall structure of the conductive rod is the same as that of the telescopic connecting piece, the conductive rod comprising a third sliding rod and a fourth sliding rod, the third sliding rod being connected to the moving contact movable connecting piece, and the fourth sliding rod being connected to the moving contact fixed connecting piece; the third sliding rod is provided with an insulating reaming hole at one end close to the moving contact movable connecting piece, and the fourth sliding rod is provided with a back-off groove section, and a dimensional margin is left between the back-off groove section and the end of the fourth sliding rod; the end of the fourth sliding rod is provided with an insulating coating; when the moving contact fixed connecting piece and the static contact connecting piece are in a minimum spacing state, the insulating reaming hole and the back-off groove section partially overlap along the axial direction; when the back-off groove section exits the insulating reaming hole, the inner circumference of the third sliding rod contacts the outer circumference of the fourth sliding rod.
[0019] By adopting the above technical solution, the structure of the conductive rod is the same as that of the telescopic connecting piece, so that the conductive rod and the telescopic connecting piece can be processed respectively in the same processing method, which is more convenient.
[0020] Optionally, the reset drive member includes a plumb bob member, the plumb bob member is connected to the movable contact connecting member via a thread, and the movable contact fixed connecting member is provided with a threading hole for the thread to pass through.
[0021] By adopting the above technical solution, the gravity of the plumb bob is used as the main power to drive the movable contact movable connecting member to move and reset. The gravity of the plumb bob is relatively constant, which is conducive to making the power of the reset driving member more durable.
[0022] Optionally, the first sliding rod and the second sliding rod are both pipe fittings, the second sliding rod is plugged into the threading hole, and the wire passes through the first sliding rod, the second sliding rod and the threading hole in sequence.
[0023] By adopting the above technical solution, the wire connecting the plumb bob passes through the first sliding rod and the second sliding rod in sequence, so that the wire is protected by the first sliding rod and the second sliding rod.
[0024] Optionally, the moving contact fixed connecting piece is provided with a rotating guide rod for threading the wire, the rotating guide rod comprises a first guide rod and a second guide rod, the first guide rod is rotatably sleeved and connected to the second guide rod, a bending port is provided at one end of the first guide rod away from the second guide rod, the bending port is rotatably connected to the moving contact fixed connecting piece, and the second guide rod is fixedly connected to the plumb bob at one end away from the first guide rod.
[0025] By adopting the above technical solution, when the plumb member moves up and down with the movement of the movable contact connecting member, the second guide rod can be telescopically moved relative to the first guide rod, so that the lifting and lowering movement of the plumb member is guided, which is conducive to reducing the hanging and shaking of the plumb member, and making the lifting and lowering movement of the plumb member more stable. The first guide rod is rotatably connected to the movable contact connecting member through the bending port, so that the first guide rod and the second guide rod can automatically rotate to a drooping state under the gravity of the plumb member, so that the gravity of the plumb member can play the role of driving the movable contact connecting member as much as possible.
[0026] A circuit breaker comprises a circuit breaker moving contact component, a circuit breaker stationary contact component and a driving structure of a closing resistor as described in any one of the above, wherein the stationary contact connector of the driving structure of the closing resistor is connected to the circuit breaker stationary contact component, and the moving contact fixed connector is connected to the circuit breaker moving contact component.
[0027] In summary, the present application includes at least one of the following beneficial technical effects:
[0028] The closing resistor is connected and put into operation by utilizing the magnetic attraction between the first magnet and the second magnet, and the problem of wear of the transmission connection part is not likely to occur, which is beneficial to ensuring the reliability of the closing resistor.
[0029] The conductive rod is provided with an insulating area. When the circuit breaker is closed in place, the movable contact fixed connector and the static contact connector are in a minimum spacing state. At this time, the conductive rod and the movable contact fixed connector are disconnected from the electrical connection state, so that the closing resistor is quickly disconnected after the circuit breaker is closed.
[0030] The gravity of the plumb bob is used as the main power to drive the movable contact movable connecting member to move and reset. The gravity of the plumb bob is relatively constant, which is conducive to making the power of the reset driving member more durable. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the driving structure of the closing resistor of Example 1 when the movable contact movable connecting piece moves into position.
[0032] Figure 2It is a schematic diagram of the driving structure of the closing resistor of Example 1 when the closing resistor is connected and the moving contact fixed connection piece has not yet moved into position.
[0033] Figure 3 It is a schematic diagram of the driving structure of the closing resistor in Example 1 when both the movable connecting piece of the moving contact and the fixed connecting piece of the moving contact are moved into place.
[0034] Figure 4 yes Figure 1 A magnified partial view of point A in the middle.
[0035] Figure 5 It is a schematic diagram of the driving structure of the closing resistor in Example 2 when the movable contact movable connecting piece moves into position.
[0036] Figure 6 It is a schematic diagram of the driving structure of the closing resistor in Example 3 when the movable contact movable connecting piece moves into position.
[0037] Figure 7 It is a schematic diagram of the driving structure of the closing resistor in Example 4 when the movable contact movable connecting piece moves into position.
[0038] Figure 8 It is a schematic diagram for illustrating the matching relationship between the third sliding bar and the fourth sliding bar in Embodiment 4.
[0039] Description of reference numerals:
[0040] 1. Static contact connector; 21. Moving contact movable connector; 22. Moving contact fixed connector; 221. Through hole; 222. Threading hole; 3. Closing resistor static contact; 4. Closing resistor moving contact; 5. Closing resistor unit; 6. First magnet; 7. Second magnet; 8. Conductive rod; 81. Insulation area; 82. Plastic insulation layer; 83. Third slide bar; 831. Insulation expansion hole; 84. Fourth slide bar; 841 , back-off groove section; 85, insulating coating; 9, reset drive member; 91, plumb member; 92, wire; 10, telescopic connector; 101, first slide bar; 1011, slit; 102, second slide bar; 1031, limit pin; 20, rotating guide rod; 201, first guide rod; 2011, bending port; 202, second guide rod; 30, circuit breaker static contact member; 40, circuit breaker moving contact member. DETAILED DESCRIPTION
[0041] The following is combined with Figure 1-8 This application is described in further detail. Example 1
[0042] The embodiment of the present application discloses a driving structure of a closing resistor. Figure 1The driving structure of the closing resistor includes a static contact connector 1, a moving contact movable connector 21 and a moving contact fixed connector 22. The static contact connector 1 is provided with a closing resistor static contact 3 and a closing resistor unit 5. The static contact connector 1 is used to connect the static contact of the circuit breaker; the moving contact fixed connector 22 is used to connect the moving contact of the circuit breaker. The moving contact movable connector 21 is movably connected to the moving contact fixed connector 22. The moving contact movable connector 21 is located between the moving contact fixed connector 22 and the static contact connector 1. The moving contact movable connector 21 is provided with a closing resistor moving contact 4.
[0043] The moving contact movable connecting piece 21 is provided with a first magnet 6, and the stationary contact connecting piece 1 is provided with a second magnet 7. The first magnet 6 and the second magnet 7 are both permanent magnets. A magnetic attraction force can be formed between the first magnet 6 and the second magnet 7, so that the moving contact movable connecting piece 21 can be accelerated to move toward the stationary contact connecting piece 1.
[0044] Reference Figure 1 , the movable contact connecting piece 21 is provided with a conductive rod 8, and the movable contact fixed connecting piece 22 is provided with a through hole 221 adapted to the conductive rod 8, and the conductive rod 8 can form a sliding contact with the movable contact fixed connecting piece 22. An insulating area 81 is provided on the outer peripheral surface of the conductive rod 8, and the rod diameter of the end of the conductive rod 8 is greater than the rod diameter of the insulating area 81, and the length of the insulating area 81 is less than the total length of the conductive rod 8, and a gap is left between the insulating area 81 and the end of the conductive rod 8. The end of the conductive rod 8 referred to in this embodiment is the end of the conductive rod 8 away from the movable contact connecting piece 21. When the movable contact fixed connecting piece 22 and the static contact connecting piece 1 are in a minimum spacing state, the conductive rod 8 is insulated from the movable contact fixed connecting piece 22 through the insulating area 81. When the end of the conductive rod 8 contacts the through hole 221, the conductive rod 8 is electrically connected to the movable contact fixed connecting piece 22.
[0045] Reference Figure 1 The moving contact movable connector 21 is provided with a reset driving member 9, and the reset driving member 9 is used to force the moving contact movable connector 21 to approach the moving contact fixed connector 22; a telescopic connector 10 is connected between the moving contact movable connector 21 and the moving contact fixed connector 22, and the telescopic connector 10 has telescopic damping, and the telescopic connector 10 is an insulating member. The moving contact fixed connector 22 can drive the moving contact movable connector 21 to approach the moving contact fixed connector 22 through the telescopic connector 10 in the extreme contraction state, and the moving contact fixed connector 22 can drive the moving contact movable connector 21 away from the moving contact fixed connector 22 through the telescopic connector 10 in the extreme extension state.
[0046] When the moving contact movable connecting member 21 moves toward the static contact connecting member 1, the magnetic attraction between the first magnet 6 and the second magnet 7 can drive the moving contact movable connecting member 21 away from the moving contact fixed connecting member 22; when the first magnet 6 and the second magnet 7 are at the maximum separation distance, the magnetic attraction between the first magnet 6 and the second magnet 7 is smaller than the force exerted by the reset drive member 9 on the moving contact movable connecting member 21.
[0047] Combination Figure 1-3 The working principle of the driving structure of the closing resistor in the embodiment of the present application is as follows: when the circuit breaker performs a closing action, the moving contact of the circuit breaker moves toward the static contact. At the same time, the moving contact movable connection member 21 and the moving contact fixed connection member 22 move toward the static contact connection member 1. As the moving contact movable connection member 21 gradually approaches the static contact connection member 1, the magnetic attraction between the first magnet 6 and the second magnet 7 gradually increases, so that the moving contact movable connection member 21 overcomes the obstruction of the reset drive member 9 and accelerates to approach and abut against the static contact connection member 1. Due to the magnetic attraction between the first magnet 6 and the second magnet 7, the movement of the moving contact movable connection member 21 is accelerated, so that the moving and static contacts of the closing resistor can be turned on through the conductive rod 8 before the moving and static contacts of the circuit breaker, so that the closing resistor can play a role; Figure 2 In the state shown, the closing resistors are connected to each other, while the moving and static contacts of the circuit breaker are not yet connected. That is, at this time, the closing resistor is put into operation before the main break of the arc extinguishing chamber is closed, which can suppress the closing inrush current. As the closing action continues, the moving and static contacts of the circuit breaker enter the Figure 3 The conducting state shown, that is, the main break of the arc extinguishing chamber enters the closed state, at which time the closing resistance is short-circuited; when the circuit breaker performs the opening action, the moving contact fixed connection member 22 drives the moving contact movable connection member 21 to leave the static contact connection member 1 through the telescopic connection member 10. During this process, the magnetic attraction force between the first magnet 6 and the second magnet 7 gradually decreases, so that the reset drive member 9 can force the moving contact movable connection member 21 to retreat and reset to approach the moving contact fixed connection member 22.
[0048] Reference Figure 1 and Figure 4 The telescopic connecting member 10 includes a first sliding rod 101, a second sliding rod 102 and a limiting structure. The first sliding rod 101 and the second sliding rod 102 are both tubular structures. The first sliding rod 101 is sleeved on the second sliding rod 102, so that the first sliding rod 101 and the second sliding rod 102 form a sliding connection. The end of the first sliding rod 101 away from the second sliding rod 102 is fixedly connected to the moving contact movable connecting member 21, and the end of the second sliding rod 102 away from the first sliding rod 101 is fixedly connected to the moving contact fixed connecting member 22.
[0049] The peripheral wall of the first slide bar 101 is provided with a slit 1011 extending in the axial direction, and the end of the slit 1011 away from the movable contact connector 21 is a closed end; the second slide bar 102 is fixedly provided with a limit pin 1031, and the limit pin 1031 passes through the slit 1011. The limit pin 1031 and the inner surface of the end of the slit 1011 away from the movable contact connector 21 jointly form a limit effect on the first slide bar 101 and the second slide bar 102 to prevent the first slide bar 101 and the second slide bar 102 from separating from each other, that is, the limit pin 1031 and the inner surface of the slit 1011 away from the movable contact connector 21 jointly serve as a limit structure. When the movable contact fixed connector 22 is away from the static contact connector 1, the second slide bar 102 can drive the first slide bar 101 through the limit structure, and then drive the movable contact connector 21.
[0050] Reference Figure 1 The reset driving member 9 includes a plumb bob 91, which is connected to the movable contact connecting member 21 via a thread 92, and the movable contact fixed connecting member 22 is provided with a threading hole 222 for threading the thread 92. The end of the second slide bar 102 away from the first slide bar 101 is plugged and fixed to the threading hole 222, and the thread 92 passes through the first slide bar 101, the second slide bar 102 and the threading hole 222 in sequence.
[0051] Reference Figure 1 The moving contact fixed connecting piece 22 is provided with a rotating guide rod 20 for threading the wire 92. The rotating guide rod 20 includes a first guide rod 201 and a second guide rod 202. The first guide rod 201 is rotatably sleeved and connected with the second guide rod 202. A bending port 2011 is provided at one end of the first guide rod 201 away from the second guide rod 202. A right angle or an obtuse angle is formed between the bending port 2011 and the main body of the first guide rod 201. The bending port 2011 is rotatably connected to the moving contact fixed connecting piece 22. The end of the second guide rod 202 away from the first guide rod 201 is fixedly connected to the plumb bob 91.
[0052] When the plumb member 91 moves up and down with the movement of the movable contact connecting member 21, the second guide rod 202 can move telescopically relative to the first guide rod 201, so that the lifting and lowering movement of the plumb member 91 is guided, which is conducive to reducing the hanging and shaking of the plumb member 91, and making the lifting and lowering movement of the plumb member 91 more stable. The first guide rod 201 is rotatably connected to the movable contact fixed connecting member 22 through the bending port 2011, so that the first guide rod 201 and the second guide rod 202 can automatically rotate to a drooping state under the gravity of the plumb member 91, so that the gravity of the plumb member 91 can play the role of driving the movable contact connecting member 21 as much as possible.
[0053] The present embodiment also discloses a circuit breaker, comprising a circuit breaker moving contact component 40, a circuit breaker stationary contact component 30 and the above-mentioned driving structure of the closing resistor, wherein the circuit breaker moving contact component 40 has a moving contact, the circuit breaker stationary contact component 30 has a stationary contact, the stationary contact connector 1 of the driving structure of the closing resistor is connected to the circuit breaker stationary contact component 30, and the moving contact fixed connector 22 is connected to the circuit breaker moving contact component 40. Example 2
[0054] The telescopic connecting member 10 and the reset driving member 9 in this embodiment are different from those in the first embodiment.
[0055] Reference Figure 5 In this embodiment, the reset driving member 9 is a coil spring, which is sleeved on the conductive rod 8, one end of the coil spring is connected to the movable contact connecting member 21, and the other end is connected to the movable contact fixed connecting member 22. When the movable contact connecting member 21 is separated from the static contact connecting member 1, the elastic deformation force of the coil spring forces the movable contact connecting member 21 to move toward the direction close to the movable contact fixed connecting member 22 to reset. Example 3
[0056] Reference Figure 6 The difference between this embodiment and embodiment 1 is that the insulating area 81 of the conductive rod 8 is provided with a plastic insulating layer 82, the outer diameter of the plastic insulating layer 82 is the same as the outer diameter of the conductive rod 8, and the outer peripheral surface of the plastic insulating layer 82 is smoothly transitioned to the outer peripheral surface of the end of the conductive rod 8, so that the conductive rod 8 can be in smooth contact with the through hole 221 over the entire length range, so that the relative movement between the conductive rod 8 and the moving contact fixed connector 22 is relatively stable. Example 4
[0057] Reference Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that the conductive rod 8 is a telescopic rod, and the overall structure of the conductive rod 8 is the same as the telescopic connecting member 10. The conductive rod 8 includes a third sliding rod 83 and a fourth sliding rod 84. The structure of the third sliding rod 83 is the same as the first sliding rod 101, and the structure of the fourth sliding rod 84 is the same as the second sliding rod 102. The third sliding rod 83 and the fourth sliding rod 84 are both conductive parts. The third sliding rod 83 is connected to the movable connecting member 21 of the moving contact, and the fourth sliding rod 84 is connected to the fixed connecting member 22 of the moving contact.
[0058] An insulating reaming hole 831 is provided at one end of the third slide bar 83 close to the movable contact connecting piece 21, and the inner diameter of the insulating reaming hole 831 is larger than the inner diameter of the main body of the third slide bar 83; the fourth slide bar 84 is provided with a back-off groove section 841, and the diameter of the back-off groove section 841 is smaller than the diameter of the main body of the fourth slide bar 84, and a size margin is left between the back-off groove section 841 and the end of the fourth slide bar 84; an insulating coating 85 is provided at the end of the fourth slide bar 84; when the movable contact fixed connecting piece 22 and the static contact connecting piece 1 are in the minimum spacing state, the insulating reaming hole 831 and the back-off groove section 841 partially overlap along the axial direction; when the back-off groove section 841 exits the insulating reaming hole 831, the inner circumference of the third slide bar 83 contacts the outer circumference of the fourth slide bar 84.
[0059] In this embodiment, the conductive rod 8 and the telescopic connector 10 have the same structure, so that the conductive rod 8 and the telescopic connector 10 can be processed in the same way, which is more convenient.
[0060] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. The driving structure of the closing resistor is characterized by: It comprises a stationary contact connector (1), a movable contact connector (21) and a movable contact fixed connector (22), wherein the stationary contact connector (1) is used to connect the stationary contact of the circuit breaker, and the movable contact fixed connector (22) is used to connect the movable contact of the circuit breaker; The movable contact connecting piece (21) is provided with a conductive rod (8), and the conductive rod (8) is capable of forming a sliding contact with the movable contact fixed connecting piece (22), and the movable contact fixed connecting piece (22) is located on a side of the movable contact connecting piece (21) away from the static contact connecting piece (1); the movable contact connecting piece (21) is provided with a reset driving piece (9), and the reset driving piece (9) is used to force the movable contact connecting piece (21) to approach the movable contact fixed connecting piece (22); A telescopic connection piece (10) is connected between the movable contact connection piece (21) and the movable contact fixed connection piece (22), and the telescopic connection piece (10) is an insulating piece; the movable contact fixed connection piece (22) can drive the movable contact connection piece (21) to approach the movable contact fixed connection piece (22) through the telescopic connection piece (10) in the extreme contraction state, and the movable contact fixed connection piece (22) can drive the movable contact connection piece (21) to move away from the movable contact fixed connection piece (22) through the telescopic connection piece (10) in the extreme extension state; The telescopic connecting member (10) comprises a first sliding rod (101), a second sliding rod (102) and a limiting structure, wherein the first sliding rod (101) and the second sliding rod (102) are parallel to each other and slidably connected, the first sliding rod (101) is fixedly connected to the movable contact connecting member (21), and the second sliding rod (102) is fixedly connected to the movable contact fixed connecting member (22), and the limiting structure is used to prevent the first sliding rod (101) and the second sliding rod (102) from being separated from each other, and the second sliding rod (102) can drive the first sliding rod (101) through the limiting structure; The movable contact connecting member (21) is provided with a first magnet (6), and the stationary contact connecting member (1) is provided with a second magnet (7); when the movable contact connecting member (21) moves toward the stationary contact connecting member (1), the magnetic attraction between the first magnet (6) and the second magnet (7) can drive the movable contact connecting member (21) away from the movable contact fixed connecting member (22); when the first magnet (6) and the second magnet (7) are at a maximum separation distance, the magnetic attraction between the first magnet (6) and the second magnet (7) is smaller than the force of the reset driving member (9) on the movable contact connecting member (21); The first slide bar (101) is a tubular structure, the first slide bar (101) is sleeved on the second slide bar (102), the peripheral wall of the first slide bar (101) is provided with a slit (1011) extending in the axial direction, and the end of the slit (1011) away from the movable contact connecting piece (21) is a closed end; the second slide bar (102) is fixedly provided with a limit pin (1031), the limit pin (1031) passes through the slit (1011), and the limit pin (1031) and the inner surface of the end of the slit (1011) away from the movable contact connecting piece (21) together form a limit effect on the first slide bar (101) and the second slide bar (102); An insulating area (81) is provided on the outer circumference of the conductive rod (8), the length of the insulating area (81) is less than the total length of the conductive rod (8), a distance is left between the insulating area (81) and the end of the conductive rod (8), and when the movable contact fixed connection piece (22) and the stationary contact connection piece (1) are in a minimum distance state, the conductive rod (8) is insulated from the movable contact fixed connection piece (22) through the insulating area (81); The conductive rod (8) is a telescopic rod. The overall structure of the conductive rod (8) is the same as that of the telescopic connecting piece (10). The conductive rod (8) comprises a third sliding rod (83) and a fourth sliding rod (84). The third sliding rod (83) is connected to the movable contact connecting piece (21), and the fourth sliding rod (84) is connected to the movable contact fixed connecting piece (22). An insulating expansion hole (831) is provided at one end of the third sliding rod (83) close to the movable contact connecting piece (21), and a knife retreat groove section (841) is provided on the fourth sliding rod (84). A dimensional margin is left between the backing groove section (841) and the end of the fourth slide bar (84); an insulating coating (85) is provided at the end of the fourth slide bar (84); when the movable contact fixed connection member (22) and the static contact connection member (1) are in a minimum spacing state, the insulating expansion hole (831) and the backing groove section (841) partially overlap along the axial direction; when the backing groove section (841) exits the insulating expansion hole (831), the inner circumference of the third slide bar (83) contacts the outer circumference of the fourth slide bar (84); The reset drive member (9) comprises a plumb bob member (91), the plumb bob member (91) is connected to the movable contact connecting member (21) via a thread (92), and the movable contact fixed connecting member (22) is provided with a threading hole (222) for the thread (92) to pass through.
2. The driving structure of the closing resistor according to claim 1, characterized in that: The reset drive member (9) is a coil spring, one end of which is connected to the movable contact connecting member (21) and the other end of which is connected to the movable contact fixing connecting member (22).
3. The driving structure of the closing resistor according to claim 1, characterized in that: The first slide bar (101) and the second slide bar (102) are both pipe fittings, the second slide bar (102) is plugged into the threading hole (222), and the silk thread (92) passes through the first slide bar (101), the second slide bar (102) and the threading hole (222) in sequence.
4. The driving structure of the closing resistor according to claim 3, characterized in that: The movable contact fixed connection member (22) is provided with a rotating guide rod (20) for threading the wire (92), the rotating guide rod (20) comprising a first guide rod (201) and a second guide rod (202), the first guide rod (201) and the second guide rod (202) being rotatably sleeved and connected, the first guide rod (201) is provided with a bending port (2011) at one end away from the second guide rod (202), the bending port (2011) is rotatably connected to the movable contact fixed connection member (22), and the second guide rod (202) is fixedly connected to the plumb bob (91) at one end away from the first guide rod (201).
5. A circuit breaker, characterized in that: It comprises a circuit breaker moving contact component (40), a circuit breaker stationary contact component (30) and a driving structure of a closing resistor as claimed in any one of claims 1 to 4, wherein the stationary contact connector (1) of the driving structure of the closing resistor is connected to the circuit breaker stationary contact component (30), and the moving contact fixed connector (22) is connected to the circuit breaker moving contact component (40).