On-off mechanism of circuit breaker

Abstract

The invention provides an on-off mechanism of a circuit breaker. The on-off mechanism comprises a spring, a fixed shaft I, an upper connecting rod, a movable iron core, a driving device and a fixed shaft II, the middle part of the movable iron core is rotationally mounted on the shell through a fixed shaft I, and the movable iron core can axially slide along the fixed shaft I; the spring sleeves the fixed shaft I, one end of the spring is connected with the shell, and the other end of the spring is connected with the upper end surface of the movable iron core; the upper end of the upper connecting rod is rotationally installed on the shell through a second fixing shaft. A wedge-shaped table is arranged at the lower end of the upper connecting rod; the wedge-shaped table can push the movable iron core to slide upwards in the first axial direction of the fixed shaft along with rotation of the upper connecting rod. The driving device is installed on the right side of the upper connecting rod, and the working end of the driving device and the upper connecting rod are located on the same plane. The handle is connected with the upper connecting rod through the U-shaped connecting rod; according to the invention, opening and closing of the circuit breaker are realized through the single driving mechanism, and tripping and opening of the circuit breaker can be realized through the electromagnet when instantaneous current exceeding safety occurs in the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a switching mechanism of a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect the current under normal circuit conditions and close, carry and disconnect the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague. Generally, those above 3kV are called high-voltage electrical appliances. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overloads or short circuits and undervoltage faults, they can automatically cut off the circuit. Its function is equivalent to the combination of fuse switches and over-underheating relays. Moreover, it is generally not necessary to change parts after breaking the fault current. It has been widely used. In the generation, transmission and use of electricity, power distribution is an extremely important link. The distribution system includes transformers and various high and low voltage electrical equipment, and low-voltage circuit breakers are a kind of electrical appliances with large usage and wide application. At present, most circuit breakers still use pure mechanical structures for closing and opening. However, the field of low-voltage electrical appliances is now developing in the direction of intelligence, such as smart homes and 5G communications. As 5G network construction is just beginning, the reliability of intelligent miniature circuit breakers in the power distribution industry needs to be improved in terms of intelligent control. At present, there is a lack of circuit breakers suitable for the intelligent distribution industry. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a circuit breaker on-off mechanism with electromagnet drive.

[0004] The present invention is achieved through the following technical solutions: A circuit breaker on-off mechanism comprises a housing of the circuit breaker; the housing is provided with a closing mechanism, a tripping mechanism and a reset mechanism of the circuit breaker (all of the above are prior art); the circuit breaker on-off mechanism also comprises a spring, a fixed shaft 1, an upper connecting rod, a moving iron core, a driving device and a fixed shaft 2; the middle part of the moving iron core is rotatably mounted on the housing via the fixed shaft 1, and the moving iron core can slide axially along the fixed shaft 1; the spring is sleeved on the fixed shaft 1, one end of the spring is connected to the housing, and the other end is connected to the upper end surface of the moving iron core; the upper end of the upper connecting rod is rotatably mounted on the housing via the fixed shaft 2; the lower end of the upper connecting rod is provided with a wedge-shaped platform, and the lower surface of the moving iron core is provided with an inclined surface matching the wedge-shaped platform; the The wedge-shaped platform can push the moving iron core to slide upward along one axis of the fixed axis as the upper connecting rod rotates; the driving device is installed on the right side of the upper connecting rod, and the working end of the driving device is located in the same plane as the upper connecting rod; the on-off mechanism also includes a handle and a U-shaped connecting rod; the handle is connected to the upper connecting rod through the U-shaped connecting rod, and is used for the opening and closing of the circuit breaker; the lower end of the upper connecting rod is connected to the closing mechanism of the circuit breaker; the lower end of the moving iron core is connected to the tripping mechanism of the circuit breaker; the on-off mechanism of the circuit breaker also includes a yoke; the yoke is installed on the shell on the right side of the lower end of the moving iron core, and is used to rotate the moving iron core when the electromagnetic force becomes larger; the spring is a compression spring or a torsion spring; the driving device is an electromagnet or a linear motor.

[0005] Beneficial effects of the present invention: The present invention realizes the opening and closing of the circuit breaker through a single driving mechanism, and when the circuit breaker has an instantaneous current exceeding the safety level, the circuit breaker can be tripped and opened through the electromagnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The present invention is further described in detail below with reference to the accompanying drawings.

[0007] Figure 1 It is a structural schematic diagram of the on-off mechanism of the present invention in the original state.

[0008] Figure 2 It is a structural schematic diagram of the on-off mechanism of the present invention.

[0009] Figure 3 It is a structural schematic diagram of the on-off mechanism of the present invention in a tripped state.

[0010] Figure 4 It is a structural schematic diagram of the upper connecting rod described in the present invention.

[0011] As shown in the figure: 1-spring; 2-fixed shaft one; 3-upper connecting rod; 31-wedge-shaped table; 4-moving iron core; 5-driving device; 6-fixed shaft two; 7-handle; 71-U-shaped connecting rod; 8-housing; 9-yoke; 10-reset spring; 11-reset rod. DETAILED DESCRIPTION

[0012] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0013] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0014] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be noted that the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0015] like Figure 1-Figure 4 The on-off mechanism of the circuit breaker shown includes: a spring 1, a fixed shaft 2, an upper connecting rod 3, a wedge-shaped platform 31, a moving iron core 4, a driving device 5, a fixed shaft 6, a handle 7, a U-shaped connecting rod 71, a housing 8, a yoke 9, a closing mechanism, a tripping mechanism and a reset mechanism.

[0016] The housing 8 of the circuit breaker is a conventional circuit breaker housing, and the housing 8 is equipped with a conventional closing mechanism, a tripping mechanism and a reset mechanism of the circuit breaker; the reset mechanism includes a reset spring 10 and a reset rod 11, and the reset spring 10 is installed on the upper connecting rod 3. The reset spring 10 is used to provide elastic force for resetting, and the reset rod 11 cooperates with the upper connecting rod 3. After the moving contact of the circuit breaker is toggled to trip the mechanism, the operating mechanism is used to reset under the action of the reset spring 10 and the reset rod 11. The principle is the same as that of the patent No. ZL202322214500.2, which is the prior art.

[0017] The handle 7 is slidably mounted in the housing 8 , and the handle 7 is connected to the upper connecting rod 3 via a U-shaped connecting rod 71 , and is used for opening and closing the circuit breaker.

[0018] The middle part of the moving iron core 4 is rotatably mounted on the housing 8 via a fixed shaft 2, and the moving iron core 4 can slide axially along the fixed shaft 2; the lower end of the moving iron core 4 is connected to the tripping mechanism of the circuit breaker.

[0019] The spring 1 is sleeved on the fixed shaft 2, one end of the spring 1 is connected to the housing 8, and the other end is connected to the upper end surface of the moving iron core 4; the spring 1 is a compression spring or a torsion spring, and the spring 1 cooperates with the moving iron core 4 and provides axial pressure and rotational torque to the moving iron core 4.

[0020] The upper end of the upper connecting rod 3 is rotatably mounted on the housing 8 through the fixed shaft 26; the lower end of the upper connecting rod 3 is provided with a wedge-shaped platform 31, and the lower surface of the moving iron core 4 is provided with an inclined surface matching the wedge-shaped platform 31; the wedge-shaped platform 31 can push the moving iron core 4 to slide upward along the fixed shaft 2 as the upper connecting rod 3 rotates; the lower end of the upper connecting rod 3 is connected to the closing mechanism of the circuit breaker; the wedge-shaped platform 31 is not limited to a ladder platform with an inclined surface, and can also be an electromagnet or a linear motor to make the moving iron core 4 reach the upper limit position and the lower limit position.

[0021] The driving device 5 is installed on the right side of the upper connecting rod 3, and the working end of the driving device 5 is located in the same plane as the upper connecting rod 3; the driving device 5 is an electromagnet or a linear motor.

[0022] The yoke 9 is mounted on the housing 1 at the right side of the lower end of the moving iron core 4, and is used to rotate the moving iron core 4 when the electromagnetic force becomes larger.

[0023] The working principle of the present invention is: When the circuit breaker is in the disconnected state, the wedge block 31 on the upper connecting rod 3 is below the moving iron core 4, pushing the moving iron core 4 upward so that the moving iron core 4 and the driving end of the driving mechanism 5 are offset front and back, and then when the driving mechanism 5 is controlled to move to the left, the moving iron core 4 will be offset and contact with the connecting rod 3, so that the connecting rod 3 rotates clockwise around the fixed axis 6, thereby driving the closing mechanism to achieve the connection action, and then the driving mechanism 5 is reset; after the driving mechanism 5 is controlled to be reset, the moving iron core 4 slides axially downward under the pressure of the spring 1, and at this time the moving iron core 4 and the driving end of the driving mechanism 5 are in the same plane, and the driving mechanism 5 is controlled to move to the left and contact with the moving iron core 4, so that the moving iron core 4 moves counterclockwise around the fixed axis 2, thereby driving the tripping mechanism to complete the disconnection action.

[0024] When the circuit breaker is in the on state, a short circuit (abnormal) in the circuit will cause the magnetic force of the yoke 9 on the moving iron core 4 to increase sharply. When the magnetic force is greater than the torque value of the spring 1, the lower end of the moving iron core 4 is attracted by the yoke 9 and approaches the yoke 9, thereby causing the moving iron core 4 to move counterclockwise around the fixed shaft 2, thereby unlocking and tripping the circuit breaker tripping mechanism, completing the tripping and disconnecting action.

[0025] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. Any modifications, equivalent replacements, improvements, etc. made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A circuit breaker on-off mechanism, comprising a circuit breaker housing (8); the housing (8) is equipped with a closing mechanism, a tripping mechanism and a resetting mechanism of the circuit breaker; characterized in that : It also includes a spring (1), a fixed shaft (2), an upper connecting rod (3), a moving iron core (4), a driving device (5) and a fixed shaft (6); the middle part of the moving iron core (4) is rotatably mounted on the housing (8) through the fixed shaft (2), and the moving iron core (4) can slide axially along the fixed shaft (2); the spring (1) is sleeved on the fixed shaft (2), one end of the spring (1) is connected to the housing (8), and the other end is connected to the upper end surface of the moving iron core (4); the upper end of the upper connecting rod (3) is rotatably mounted on the housing (8) through the fixed shaft (6); The lower end of the upper connecting rod (3) is provided with a wedge-shaped platform (31), and the lower surface of the moving iron core (4) is provided with an inclined surface matching the wedge-shaped platform (31); the wedge-shaped platform (31) can push the moving iron core (4) to slide upward along the fixed axis (2) as the upper connecting rod (3) rotates; the driving device (5) is mounted on the right side of the upper connecting rod (3), and the working end of the driving device (5) and the upper connecting rod (3) are located in the same plane; the lower end of the upper connecting rod (3) is connected to the closing mechanism of the circuit breaker; and the lower end of the moving iron core (4) is connected to the tripping mechanism of the circuit breaker.

2. A circuit breaker on-off mechanism according to claim 1, characterized in that : It also includes a yoke (9); the yoke (9) is mounted on the housing (1) on the right side of the lower end of the moving iron core (4) and is used to cause the moving iron core (4) to rotate when the electromagnetic force increases.

3. A circuit breaker on-off mechanism according to claim 1, characterized in that : The spring (1) is a compression spring or a torsion spring.

4. The on-off mechanism of a circuit breaker according to claim 1, characterized in that The driving device (5) is an electromagnet or a linear motor.

5. The on-off mechanism of a circuit breaker according to claim 1, characterized in that The invention also comprises a handle (7) and a U-shaped connecting rod (71); the handle (7) is slidably mounted in the housing (8); the handle (7) is connected to the upper connecting rod (3) via the U-shaped connecting rod (71) and is used for opening and closing the circuit breaker.

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