Circuit breaker of opening and closing driving mechanism

Abstract

The invention discloses an opening and closing driving mechanism circuit breaker, which relates to the technical field of circuit breakers, and comprises a box body, an insulating cylinder, a vacuum arc-extinguishing chamber and a contact assembly, and further comprises a driving assembly which comprises a driving rod in sliding connection with the box body and is used for driving the contact assembly to be opened or closed; the buffering assembly comprises a supporting block which is located in the box body and is in sliding connection with the driving rod, the driving rod is in sliding connection with the supporting block through a push plate, and an air cylinder is fixed in the supporting block and is used for buffering rapid sliding of the driving rod; the compensation assembly comprises an adjusting cylinder fixedly connected with the air cylinder, the adjusting cylinder is connected with a compensation cylinder through an air pipe, an air guide hole is formed in the adjusting cylinder, and when the driving rod slides, air in the air cylinder is squeezed into the compensation cylinder through the air guide hole to dynamically compensate and buffer sliding of the driving rod; according to the invention, dynamic buffer and compensation can be carried out on contact of the contact.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker with an opening and closing drive mechanism. Background Art

[0002] A circuit breaker is a mechanical switch capable of connecting and disconnecting normal current in a carrying circuit, as well as connecting and disconnecting current under specified abnormal circuit conditions and within a specified timeframe. It automatically disconnects the circuit in the event of a severe overload, short circuit, or undervoltage fault. Its functionality is equivalent to a combination of a fuse-type switch and an over- or under-temperature relay. Furthermore, interrupting the fault current generally requires no component changes, making it widely used.

[0003] Outdoor vacuum circuit breakers generally include a mechanism box and an insulating cylinder at the top of the mechanism box. A vacuum arc chamber is provided in the insulating cylinder. Fixed contacts and moving contacts are correspondingly provided in the vacuum arc chamber. The fixed contacts and moving contacts are used to connect the power supply line and the load line respectively. A transmission mechanism, an operating mechanism and other devices are provided in the mechanism box, and an insulating pull rod is extended into the insulating cylinder through the mechanism box to drive the moving contact to make closing and opening movements. In this process, there is generally a spring energy storage mechanism to store energy to drive the transmission mechanism to complete the closing action. However, when the spring energy storage mechanism does not have a certain buffer after releasing the elastic force, it is easy for the transmission mechanism to drive the moving contact to impact the fixed contact, causing wear of the contacts and poor contact between the contacts. At the same time, elastic fatigue will occur after the spring energy storage mechanism is used for a long time. At this time, the transmission mechanism will not be in place, which will also lead to poor contact between the contacts, resulting in poor contact problems, which can easily cause safety problems.

[0004] Therefore, a circuit breaker with an opening and closing drive mechanism is invented to solve the above problems. Summary of the Invention

[0005] The main purpose of the present invention is to provide a circuit breaker with an opening and closing drive mechanism, which can effectively solve the technical problems in the background technology.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a circuit breaker with an opening and closing drive mechanism, comprising a box, an insulating cylinder, a vacuum interrupter and a contact assembly, and further comprising: a drive assembly, comprising a drive rod slidably connected to the box, for driving the contact assembly to open or close; a buffer assembly comprising a support block located inside the box and slidably connected to the drive rod, the drive rod being slidably connected to the support block via a push plate, an air cylinder being fixed in the support block for buffering the rapid sliding of the drive rod; The compensation component includes an adjusting cylinder fixedly connected to the gas cylinder, the adjusting cylinder is connected to the compensation cylinder through an air pipe, and a plurality of groups of circumferentially distributed air guide holes are provided on the adjusting cylinder. When the driving rod slides, the gas in the gas cylinder is squeezed into the compensation cylinder through the air guide holes, dynamically compensating and buffering the sliding of the driving rod.

[0007] Preferably, the push plate is located between the regulating cylinder and the compensating cylinder, a push rod in sliding connection with the push plate is provided in the air cylinder, and a pressure plate in sliding connection with the air cylinder is fixed on the push rod.

[0008] Preferably, the compensation assembly includes an adjustment block slidably connected to the adjustment cylinder, the adjustment block is fixedly connected to the push plate via an auxiliary rod, and a plurality of air guide grooves connected to the air guide holes are formed on the adjustment block.

[0009] Preferably, the compensation cylinder is slidably connected to two piston plates, an adjusting rod is fixedly connected to the piston plate, the two adjusting rods are slidably connected, and an elastic member is provided between the compensation cylinder and the piston plate.

[0010] Preferably, the diameter of the air guide groove is larger than the diameter of the air guide hole, and the diameters of the multiple groups of air guide holes increase sequentially in a direction approaching the air cylinder.

[0011] Preferably, the gas cylinder is filled with inert gas, and the connection port between the gas pipe and the compensation cylinder is located between the two piston plates.

[0012] Preferably, the driving assembly includes a plurality of rocker arms corresponding to the insulating cylinder and hinged to the driving rod, the rocker arms are hinged with an insulating rod slidingly connected to the insulating cylinder, and the driving rod is provided with a spring energy storage assembly located in the box body, which is used to store energy for the rapid sliding of the driving rod.

[0013] Preferably, the contact assembly includes a static contact located in the vacuum interrupter, the insulating rod extends into the vacuum interrupter and is fixed with a moving contact, and a bellows is sleeved on the insulating rod.

[0014] Preferably, an upper terminal is fixed to one end of the insulating cylinder away from the box body, and a lower terminal is fixed to the middle of the insulating cylinder.

[0015] Preferably, a control assembly slidably connected to the driving rod is fixed in the box body for controlling the release and energy storage of the spring energy storage assembly.

[0016] Technical effects and advantages of the present invention: The present invention adopts the linkage arrangement of the air cylinder, the push plate, the adjusting block, the compensation cylinder and the piston plate. When the driving rod slides rapidly, the inert gas in the air cylinder is squeezed, so that in the process of connecting the air guide holes with different diameters to the air guide grooves, not only can the sliding of the driving rod be buffered to a certain extent, but also the piston plate can be squeezed by the inert gas when the driving rod does not slide into place, so that the adjusting rod can compensate for the sliding of the driving rod to a certain extent, ensuring that the driving rod slides into place and can also provide a certain buffer, and dynamically buffering and compensating the sliding of the driving rod, so that the static contact and the moving contact are more stable when in contact, ensuring the normal operating state, and further improving the service life and safety effect of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a cross-sectional view of the overall structure of the present invention; Figure 3 A cross-sectional view of the overall structure of the present invention from another perspective; Figure 4 Schematic diagram of the structure of the buffer assembly in the present invention; Figure 5 It is a cross-sectional view of the structure of the buffer assembly of the present invention; Figure 6 It is a schematic diagram of the structure of the buffer component and the compensation component in the present invention; Figure 7 It is a schematic diagram of the structure of the compensation component of the present invention.

[0018] In the figure: 1. Box body; 2. Insulation cylinder; 3. Vacuum interrupter; 4. Contact assembly; 401. Static contact; 402. Moving contact; 403. Bellows; 5. Driving assembly; 501. Driving rod; 502. Rocker rod; 503. Insulating rod; 6. Buffer assembly; 601. Support block; 602. Push plate; 603. Air cylinder; 604. Push rod; 605. Press plate; 7. Compensation assembly; 701. Adjustment cylinder; 702. Air pipe; 703. Compensation cylinder; 704. Air guide hole; 705. Adjustment block; 706. Auxiliary rod; 707. Air guide groove; 708. Piston plate; 709. Adjustment rod; 710. Elastic member; 711. Inert gas; 8. Spring energy storage assembly; 9. Upper terminal; 10. Lower terminal; 11. Control assembly. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1 like Figures 1 to 3 As shown, this embodiment provides a circuit breaker with an opening and closing drive mechanism, including a box body 1, an insulating cylinder 2, a vacuum interrupter 3 and a contact assembly 4, and also includes: a drive assembly 5, which includes a drive rod 501 slidably connected to the box body 1, for driving the contact assembly 4 to open or close; the drive assembly 5 includes a plurality of rocker arms 502 corresponding to the insulating cylinder 2 and hinged to the drive rod 501, and an insulating rod 503 slidably connected to the insulating cylinder 2 is hinged on the rocker arm 502, and a spring energy storage assembly 8 located in the box body 1 is provided on the drive rod 501, which is used to store energy for the rapid sliding of the drive rod 501.

[0021] The contact assembly 4 includes a static contact 401 located in the vacuum interrupter 3, an insulating rod 503 extending into the vacuum interrupter 3 and fixed with a moving contact 402, a bellows 403 is sleeved on the insulating rod 503, an upper terminal 9 is fixed at the end of the insulating tube 2 away from the box body 1, and a lower terminal 10 is fixed in the middle of the insulating tube 2. A control assembly 11 is fixed in the box body 1 and is slidably connected to the drive rod 501, which is used to control the release and energy storage of the spring energy storage assembly 8.

[0022] In actual use, first connect the upper terminal 9 and the lower terminal 10. When closing the circuit, it is only necessary to control the spring energy storage component 8 through the control component 11 to release the elastic energy. The control component 11 and the spring energy storage component 8 are both existing technologies. The specific structure and connection method are not repeated here. At this time, the spring energy storage component 8 drives the driving rod 501 to slide along the box body 1 under the action of elastic force, so that the driving rod 501 drives the insulating rod 503 to slide upward along the insulating cylinder 2 through the rocker 502, so that the insulating rod 503 drives the moving contact 402 along the rocker The vacuum interrupter 3 slides in the direction close to the static contact 401, and the bellows 403 located in the vacuum interrupter 3 expands and contracts, which can ensure the vacuum degree in the vacuum interrupter 3 and achieve a better arc extinguishing effect. After the elastic force of the spring energy storage component 8 is released, the moving contact 402 contacts the static contact 401 to complete the closing action. When opening the circuit breaker, it is only necessary to drive the driving rod 501 to slide in the opposite direction through the control component 11 to complete the opening action. At this time, the driving rod 501 can drive the spring energy storage component 8 to store energy again, which facilitates the rapid completion of the closing action.

[0023] Example 2 During use, it was found that during the release of the spring force, due to the excessive impact force and the lack of a certain buffer, the moving contact 402 is likely to quickly impact the static contact 401, resulting in increased wear between the static contact 401 and the moving contact 402, and poor contact problems are likely to occur. At the same time, when the spring works for a long time, elastic fatigue problems will occur, and without certain compensation, the static contact 401 and the moving contact 402 are likely to not be in contact. Therefore, further improvements are made based on the above embodiments.

[0024] like Figures 2 to 7 As shown, the buffer assembly 6 includes a support block 601 located inside the box body 1 and slidably connected to the drive rod 501. The drive rod 501 is slidably connected to the support block 601 through a push plate 602. An air cylinder 603 is fixed in the support block 601 for buffering the rapid sliding of the drive rod 501. The compensation component 7 includes an adjusting cylinder 701 fixedly connected to the gas cylinder 603. The adjusting cylinder 701 is connected to the compensation cylinder 703 through an air pipe 702. A plurality of groups of circumferentially distributed air guide holes 704 are provided on the adjusting cylinder 701. When the driving rod 501 slides, the gas in the gas cylinder 603 is squeezed into the compensation cylinder 703 through the air guide holes 704, thereby dynamically compensating and buffering the sliding of the driving rod 501.

[0025] The push plate 602 is located between the regulating cylinder 701 and the compensating cylinder 703 . A push rod 604 in contact with the push plate 602 is slidably connected in the cylinder 603 . A pressure plate 605 slidably connected with the cylinder 603 is fixed on the push rod 604 .

[0026] The compensation assembly 7 includes an adjustment block 705 slidably connected to the adjustment cylinder 701 . The adjustment block 705 is fixedly connected to the pressure plate 605 via an auxiliary rod 706 . A plurality of air guide grooves 707 communicating with the air guide holes 704 are formed on the adjustment block 705 .

[0027] The compensation cylinder 703 is slidably connected to two piston plates 708 , and an adjustment rod 709 is fixedly connected to the piston plate 708 . The two adjustment rods 709 are slidably connected, and an elastic member 710 is provided between the compensation cylinder 703 and the piston plate 708 .

[0028] The diameter of the air guide groove 707 is larger than the diameter of the air guide hole 704 , and the diameters of the multiple groups of air guide holes 704 increase sequentially toward the direction approaching the air cylinder 603 .

[0029] The gas cylinder 603 is filled with inert gas 711 , and the connection between the gas pipe 702 and the compensation cylinder 703 is located between the two piston plates 708 .

[0030] In actual use, when the spring energy storage assembly 8 drives the driving rod 501 to slide quickly and the spring is in a normal state, the driving rod 501 drives the push plate 602 to slide along the support block 601, so that the push plate 602 gradually contacts the push rod 604. At the same time, under the action of the elastic member 710, the elastic member 710 drives the two adjusting rods 709 to slide along the compensation cylinder 703 through the piston plate 708, so that one of the adjusting rods 709 is always in contact with the push plate 602. When the push plate 602 contacts the push rod 604, the push plate 602 pushes the push rod 604 to drive the pressure plate 605 to slide quickly along the gas cylinder 603. The pressure plate 605 drives the adjusting block 705 to slide quickly along the adjusting cylinder 701 through the auxiliary rod 706. The diameter of the adjusting cylinder 701 is much smaller than the diameter of the gas cylinder 603, and the compensation cylinder 703 is also filled with an inert gas between the two piston plates 708. The inert gas 711 is squeezed into the compensation cylinder 703 through the air pipe 702. At this time, the air guide groove 707 on the adjustment block 705 is connected with the air guide hole 704 in sequence, and a part of the inert gas 711 is squeezed into the compensation cylinder 703 through the air pipe 702 through the air guide groove 707 and the air guide hole 704. At this time, since the spring energy storage component 8 is in a normal state, the air guide groove 707 on the adjustment block 705 is quickly connected with the air guide hole 704 with the smallest diameter, and the diameter of the air guide hole 704 increases in the direction of the air cylinder 603, so that the amount of inert gas 711 squeezed into the compensation cylinder 703 through the air pipe 702 is small. At this time, the buffering resistance provided by the air cylinder 603 to the sliding of the drive rod 501 is very large, so that after the elastic force of the spring energy storage component 8 is released, it can have a certain buffering effect on the sliding of the drive rod 501, thereby avoiding the collision and accelerated wear of the static contact 401 and the moving contact 402, and avoiding the problem of poor contact.

[0031] When the spring energy storage assembly 8 has a certain elastic fatigue and causes the static contact 401 and the moving contact 402 to be out of contact, the driving rod 501 slides and drives the push plate 602 to slide along the support block 601, so that the push plate 602 gradually contacts the push rod 604. At the same time, under the action of the elastic member 710, the elastic member 710 drives the two adjusting rods 709 to slide along the compensation cylinder 703 through the piston plate 708, so that one of the adjusting rods 709 is always in contact with the push plate 602. When the push plate 602 contacts the push rod 604, the push plate 602 pushes the push rod 604 to drive the pressure plate 605 to slide along the air cylinder 603. The pressure plate 605 drives the adjustment block 705 to slide along the adjustment cylinder 701 through the auxiliary rod 706. At this time, the air guide groove 707 on the adjustment block 705 is connected with the air guide hole 704 in sequence.

[0032] At this time, since the air guide groove 707 on the regulating block 705 cannot quickly contact the air guide hole 704 with the smallest diameter, the air guide groove 707 first contacts the air guide hole 704 with the largest diameter, so that a large amount of inert gas 711 in the gas cylinder 603 is squeezed into the compensation cylinder 703 through the air pipe 702. Since the connection between the air pipe 702 and the compensation cylinder 703 is located between the two piston plates 708, the inert gas 711 is filled between the two piston plates 708. Since the two regulating rods 709 are slidably connected, the inert gas 711 pushes one of the piston plates 708 to drive one regulating rod 709 along the other. An adjusting rod 709 slides, so that one of the adjusting rods 709 applies pressure to the push plate 602 under the action of the inert gas 711, so that when elastic fatigue occurs in the spring energy storage component 8, a certain compensation can be made for the sliding of the driving rod 501, so that the driving rod 501 can stably slide to the preset position, so that the static contact 401 and the moving contact 402 are in contact, ensuring a good closing environment. During the sliding process of the driving rod 501, dynamic buffering and pressure compensation can be performed to ensure that the static contact 401 and the moving contact 402 are in contact, avoiding impact wear.

[0033] In summary, through the linkage setting of the air cylinder 603, the push plate 602, the adjusting block 705, the compensation cylinder 703 and the piston plate 708, when the driving rod 501 slides quickly, the inert gas 711 in the air cylinder 603 is squeezed, so that in the process of the air guide holes 704 of different diameters being connected with the air guide grooves 707, not only can it play a certain buffering role in the sliding of the driving rod 501, but also when the driving rod 501 does not slide into place, the inert gas 711 can be used to squeeze the piston plate 708, so that the adjusting rod 709 can compensate for the sliding of the driving rod 501 to a certain extent, ensuring that the driving rod 501 slides into place and can also provide a certain buffer, and dynamically buffering and compensating the sliding of the driving rod 501, so that the contact between the static contact 401 and the moving contact 402 is more stable, ensuring the normal operation state, and further improving the service life and safety effect of the equipment.

[0034] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit breaker with an opening and closing drive mechanism, comprising a housing (1), an insulating cylinder (2), a vacuum interrupter (3) and a contact assembly (4), characterized in that: Also includes: A driving assembly (5), comprising a driving rod (501) slidably connected to the box (1), for driving the contact assembly (4) to open or close; a buffer assembly (6), comprising a support block (601) slidably connected to the driving rod (501), the driving rod (501) being slidably connected to the support block (601) via a push plate (602), and a gas cylinder (603) being fixed in the support block (601) for buffering the rapid sliding of the driving rod (501); The compensation assembly (7) includes an adjusting cylinder (701) fixedly connected to the gas cylinder (603), the adjusting cylinder (701) being connected to the compensation cylinder (703) via an air pipe (702), and a plurality of groups of circumferentially distributed air guide holes (704) being provided on the adjusting cylinder (701). When the driving rod (501) slides, the gas in the gas cylinder (603) is squeezed into the compensation cylinder (703) through the air guide holes (704), thereby dynamically compensating and buffering the sliding of the driving rod (501).

2. A circuit breaker with an opening and closing drive mechanism according to claim 1, characterized in that: The push plate (602) is located between the regulating cylinder (701) and the compensating cylinder (703), a push rod (604) in contact with the push plate (602) is slidably connected in the cylinder (603), and a pressure plate (605) in slidable connection with the cylinder (603) is fixed on the push rod (604).

3. A circuit breaker with an opening and closing drive mechanism according to claim 2, characterized in that: The compensation assembly (7) comprises an adjustment block (705) slidably connected to the adjustment cylinder (701), the adjustment block (705) being fixedly connected to the push plate (602) via an auxiliary rod (706), and a plurality of air guide grooves (707) communicating with the air guide holes (704) are formed on the adjustment block (705).

4. A circuit breaker with an opening and closing drive mechanism according to claim 3, characterized in that: The compensation cylinder (703) is slidably connected to two piston plates (708), an adjustment rod (709) is fixedly connected to the piston plate (708), the two adjustment rods (709) are slidably connected, and an elastic member (710) is provided between the compensation cylinder (703) and the piston plate (708).

5. A circuit breaker with an opening and closing drive mechanism according to claim 4, characterized in that: The diameter of the air guide groove (707) is greater than the diameter of the air guide hole (704), and the diameters of the multiple groups of air guide holes (704) increase sequentially in a direction approaching the air cylinder (603).

6. A circuit breaker with an opening and closing drive mechanism according to claim 5, characterized in that: The gas cylinder (603) is filled with inert gas (711), and the connection port between the gas pipe (702) and the compensation cylinder (703) is located between the two piston plates (708).

7. A circuit breaker with an opening and closing drive mechanism according to claim 6, characterized in that: The driving assembly (5) comprises a plurality of rocker arms (502) corresponding to the insulating cylinder (2) and hinged to the driving rod (501); an insulating rod (503) is hingedly connected to the rocker arms (502) and is slidably connected to the insulating cylinder (2); and a spring energy storage assembly (8) located in the box (1) is provided on the driving rod (501) for storing energy for the rapid sliding of the driving rod (501).

8. A circuit breaker with an opening and closing drive mechanism according to claim 7, characterized in that: The contact assembly (4) comprises a static contact (401) located in the vacuum interrupter (3), the insulating rod (503) extends into the vacuum interrupter (3) and is fixed with a moving contact (402), and a bellows (403) is sleeved on the insulating rod (503).

9. A circuit breaker with an opening and closing drive mechanism according to claim 8, characterized in that: An upper wiring terminal (9) is fixed to one end of the insulating cylinder (2) away from the box body (1), and a lower wiring terminal (10) is fixed to the middle of the insulating cylinder (2).

10. A circuit breaker with an opening and closing drive mechanism according to claim 9, characterized in that: A control assembly (11) is fixed in the box (1) and is slidably connected to the drive rod (501), and is used to control the release and energy storage of the spring energy storage assembly (8).

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