Novel high-voltage circuit breaker

Abstract

The utility model discloses a novel high-voltage circuit breaker, and relates to the technical field of high-voltage circuit breakers. The circuit breaker comprises a single circuit breaker body, the single circuit breaker body comprises a shell, a static contact, a moving contact, a vacuum arc-extinguishing chamber, an insulator and a permanent magnetic mechanism are arranged in the shell, the upper end of the static contact is connected with an upper wiring terminal, and the lower end of the static contact is inserted into the vacuum arc-extinguishing chamber; the lower end of the moving contact is connected with the permanent magnetic mechanism through an insulator, the upper end of the moving contact is inserted into the vacuum arc-extinguishing chamber in a sliding manner, the moving contact is connected with the lower wiring terminal, and the permanent magnetic mechanism comprises an upper cover body, a lower cover body, a movable main shaft, an inner spring, an outer spring, a fixed end, a movable end, a magnetic ring and a coil structure. According to the novel high-voltage circuit breaker provided by the utility model, an intensive design is adopted, and the permanent magnetic mechanism, the static contact, the moving contact and the vacuum arc-extinguishing chamber can be arranged in the same vertical shell, so that the high-voltage circuit breaker can be applied in a narrow space.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage circuit breakers, in particular to a novel high-voltage circuit breaker. Background Art

[0002] High-voltage circuit breakers are the main control equipment in circuits above 1000KV. In normal operation, they are used to connect or disconnect the load current of the circuit; in case of faults, they are used to quickly disconnect the short-circuit current and cut off the fault. The permanent magnetic mechanism used to control the opening and closing of the switch is the core component of the circuit breaker. In the prior art, the permanent magnetic mechanism is generally not placed in the same housing as the vacuum arc chamber due to its complex structure and large size. Instead, the permanent magnetic mechanism is placed in a separately set drive housing, and the moving contact inserted into the vacuum arc chamber in the circuit breaker is driven to move by a connecting rod. For example, the Chinese invention patent "Single-phase operated three-phase permanent magnetic mechanism indoor high-voltage circuit breaker" with publication number CN104299836A is an external permanent magnetic mechanism structure. The existing design results in a large overall volume of the high-voltage circuit breaker, which cannot be used in narrow space operations such as underground explosion-proof switches. If the existing permanent magnet mechanism is simply designed with reduced dimensions and is placed in the same housing as the vacuum interrupter, the magnetic flux will be reduced, which will reduce the pulling force on the moving contact and will not meet the rapid power-off requirements of the high-voltage circuit.

[0003] In view of this, the applicant has developed a new type of high-voltage circuit breaker, which adopts an intensive design and can arrange the permanent magnet mechanism, static contact, moving contact, and vacuum arc extinguishing chamber in the same vertical housing, so that the high-voltage circuit breaker can be used in a small space. Utility Model Content

[0004] The purpose of the utility model is to provide a novel high-voltage circuit breaker in order to solve the above-mentioned problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of high-voltage circuit breaker, including a single-body circuit breaker, the single-body circuit breaker includes a shell, a static contact, a moving contact, a vacuum interrupter, an insulator and a permanent magnet mechanism are arranged in the shell, the upper end of the static contact is connected to the upper terminal, and the lower end of the static contact is inserted into the vacuum interrupter; the lower end of the moving contact is connected to the permanent magnet mechanism through the insulator, the upper end of the moving contact is slidably inserted into the vacuum interrupter, the moving contact is connected to the lower terminal, and the permanent magnet mechanism includes an upper cover The upper cover body comprises a body, a lower cover body, a movable main shaft, an inner spring, an outer spring, a fixed end head, a movable end head, a magnetic ring and a coil structure, wherein the fixed end head comprises an outer pole body and an inner pole body, the outer pole body and the inner pole body are coaxially fixed to the lower end of the upper cover body from the outside to the inside, and a magnetic ring is installed between the inner pole body and the outer pole body; a plurality of support columns are arranged in an annular array at the lower end of the outer pole body, the lower cover body is fixed at the lower end of the support column, a movable end head is slidably sleeved on the support column between the outer pole body and the lower cover body, and a coil structure is arranged on the inner wall of the movable end head;

[0006] The movable main shaft passes through the upper cover body, the fixed end head, the movable end head and the lower cover body from top to bottom; an annular boss is arranged on the outer wall of the shaft body inside the fixed end head of the movable main shaft; an inner spring is sleeved on the movable main shaft, the upper end of the inner spring is pressed against the annular boss, and the lower end of the inner spring is pressed against the movable end head; an outer spring is sleeved outside the inner spring, the upper end of the outer spring is pressed against the upper cover body or the fixed end head, and the lower end of the outer spring is pressed against the movable end head; the upper end of the movable main shaft is connected to the moving contact through an insulator, and an adjusting nut is installed through a thread on the outer wall of one end of the movable main shaft that passes through the movable end head downward.

[0007] As a further solution of the present invention: the coil structure comprises a coil support, and a coil winding group is wound on the coil support.

[0008] As a further solution of the utility model: the magnetic ring includes more than three permanent magnet blocks, and the permanent magnet blocks are arranged in a ring array around the central axis of the inner body.

[0009] As a further solution of the utility model: a copper sleeve is fixed below the upper cover, the upper end of the outer spring is pressed against the copper sleeve, and the lower end of the outer spring is pressed against the movable end; the inner spring and the outer spring are coaxially mounted and do not interfere with each other during the expansion and contraction process.

[0010] As a further solution of the utility model: the movable end head is in a circular ring shape, and a through hole matching the movable main shaft is provided in the central axis of the movable end head. An inner ring groove and an outer ring groove with open upper ends are coaxially provided on the movable end head from the outside to the inside, and the lower ends of the inner spring and the outer spring are pressed against the lower bottom surface of the inner ring groove, and the coil structure is arranged in the outer ring groove.

[0011] As a further solution of the utility model: a guide hole that passes through the movable end head and matches the number and position of the support columns is opened up and down, and the movable end head is slidably mounted on the support column through the guide hole; the diameter of the guide hole is larger than the outer wall thickness of the outer ring groove and forms a strip groove that passes through the inside and outside.

[0012] As a further solution of the utility model: it also includes a synchronous coupling, which is in the shape of a sleeve with an open upper end and a closed lower end. The upper end of the synchronous coupling is fixed to the lower bottom surface of the movable end head by bolts, and a sleeve cavity is opened in the synchronous coupling. The lower end of the movable main shaft and the adjusting nut are arranged in the sleeve cavity; a connecting hole is opened in the solid shaft part at the lower end of the synchronous coupling.

[0013] As a further solution of the utility model: it also includes a base, three single circuit breakers are installed on the base, and the three single circuit breakers are connected to the three-phase circuit; a controller and a capacitor are arranged on the base, and the controller can control the discharge of the capacitor; when the capacitor is discharged in the forward direction, the three single circuit breakers are synchronously closed, and when the capacitor is discharged in the reverse direction, the three single circuit breakers are synchronously opened.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The novel high-voltage circuit breaker described in the utility model adopts an intensive design, and can arrange the permanent magnet mechanism, the static contact, the moving contact, and the vacuum interrupter in the same vertical housing, so that the high-voltage circuit breaker can be used in a small space.

[0016] 2. The utility model improves the structure of the permanent magnet mechanism to make its design more compact; in particular, the improvement of the movable end structure makes it synchronously contact with the outer pole body and inner pole body of the fixed end, increases the magnetic flux, and improves the driving force for moving the moving contact, making the circuit breaker suitable for high-voltage circuit switching operations of various specifications, and more universal.

[0017] In addition, by specially designing the guide hole opened on the movable end, the diameter of the guide hole is larger than the outer wall thickness of the outer ring groove and a strip groove is formed that runs through the inside and outside, which can further optimize the distribution of magnetic flux lines inside the movable end, reduce eddy currents, and reduce magnetic losses.

[0018] 3. By improving the structure of the synchronous coupling, the three single circuit breakers assembled on the base can be easily disassembled by the synchronous coupling and the position of the adjusting nut on the movable main shaft can be adjusted to make the synchronization rate of the three single circuit breakers higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a single circuit breaker of the utility model;

[0020] Figure 2 It is a schematic diagram of the internal structure of a single circuit breaker of the utility model;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the permanent magnet mechanism of the utility model;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the permanent magnet mechanism of the utility model (excluding the upper cover);

[0023] Figure 5 It is a schematic diagram of the internal structure of the permanent magnet mechanism of the utility model (excluding the coil winding group);

[0024] Figure 6 It is a schematic diagram of the installation structure of the fixed end head and the magnetic ring of the utility model;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the movable end of the utility model;

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of Example 3 of the utility model;

[0027] Fig. 9 It is a schematic diagram of the lateral structure of Example 3 of the utility model.

[0028] In the figure: 1. shell; 2. upper terminal; 3. lower terminal; 4. moving contact; 5. insulator; 6. permanent magnet mechanism; 601. fixed end; 6011. inner pole body; 6012. outer pole body; 602. movable end; 6021. through hole; 6022. inner ring groove; 6023. guide hole; 6024. outer ring groove; 603. adjusting nut; 604. lower cover; 605. support column; 606. upper cover; 607. movable spindle; 608. permanent magnet block; 609. outer spring; 610. inner spring; 611. coil bracket; 7. synchronous coupling; 701. connecting hole; 8. static contact; 9. vacuum arc extinguishing chamber; 10. base; 11. controller; 12. capacitor. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0030] See also Figures 1-2A new type of high-voltage circuit breaker described in the utility model includes a single-body circuit breaker, which includes a shell 1, in which a static contact 8, a moving contact 4, a vacuum interrupter 9, an insulator 5 and a permanent magnet mechanism 6 are arranged. The upper end of the static contact 8 is connected to the upper terminal 2, and the lower end of the static contact 8 is inserted into the vacuum interrupter 9; the lower end of the moving contact 4 is connected to the permanent magnet mechanism 6 through the insulator 5, and the upper end of the moving contact 4 is slidably inserted into the vacuum interrupter 9, and the moving contact 4 is connected to the lower terminal 3.

[0031] like Figure 3-7 As shown, the permanent magnet mechanism 6 includes an upper cover body 606, a lower cover body 604, a movable main shaft 607, an inner spring 610, an outer spring 609, a fixed end 601, a movable end 602, a magnetic ring and a coil structure, wherein the fixed end 601 includes an outer pole body 6012 and an inner pole body 6011, the outer pole body 6012 and the inner pole body 6011 are coaxially fixed on the lower end of the upper cover body 606 from the outside to the inside, and a magnetic ring is installed between the inner pole body 6011 and the outer pole body 6012; a plurality of support columns 605 are arranged in a circular array at the lower end of the outer pole body 6012, the lower end of the support column 605 is fixed with the lower cover body 604, the movable end 602 is slidably mounted on the support column 605 between the outer pole body 6012 and the lower cover body 604, and a coil structure is arranged on the inner wall of the movable end 602.

[0032] A guide hole 6023 is provided on the movable end 602 to pass through the upper and lower parts and matches the number and position of the support column 605. The movable end 602 is slidably mounted on the support column 605 through the guide hole 6023. The diameter of the guide hole 6023 is larger than the outer wall thickness of the outer ring groove 6024 and forms a strip groove passing through the inside and outside.

[0033] The movable main shaft 607 penetrates the upper cover body 606, the fixed end 601, the movable end 602 and the lower cover body 604 from top to bottom. The movable main shaft 607 is located on the outer wall of the shaft body inside the fixed end 601, and an annular boss is arranged. An inner spring 610 is installed on the movable main shaft 607, and the upper end of the inner spring 610 is pressed against the annular boss, and the lower end of the inner spring 610 is pressed against the movable end 602; an outer spring 609 is installed outside the inner spring 610, and the upper end of the outer spring 609 is pressed against the upper cover body 606 or the fixed end 601, and the lower end of the outer spring 609 is pressed against the movable end 602; the upper end of the movable main shaft 607 is connected to the moving contact 4 through the insulator 5, and an adjusting nut 603 is installed on the outer wall of one end of the movable main shaft 607 that passes through the movable end 602 downward through a thread.

[0034] The coil structure includes a coil support 611 , on which a coil winding group is wound.

[0035] The magnetic ring includes ten permanent magnet blocks 608, and the permanent magnet blocks 608 are arranged in a ring array around the central axis of the inner body.

[0036] A copper sleeve is fixed below the upper cover 606, the upper end of the outer spring 609 is pressed against the copper sleeve, and the lower end of the outer spring 609 is pressed against the movable end 602; the inner spring 610 and the outer spring 609 are coaxially mounted and do not interfere with each other during the expansion and contraction process.

[0037] like Figure 7 As shown, the movable end head 602 is in a circular ring shape, and a through hole 6021 matching the movable main shaft 607 is provided on the central axis of the movable end head 602. An inner ring groove 6022 and an outer ring groove 6024 with open upper ends are coaxially provided on the movable end head 602 from the outside to the inside. The lower ends of the inner spring 610 and the outer spring 609 are pressed against the lower bottom surface of the inner ring groove 6022, and the coil structure is arranged in the outer ring groove 6024.

[0038] A guide hole 6023 is provided on the movable end 602 to pass through the upper and lower parts and matches the number and position of the support column 605. The movable end 602 is slidably mounted on the support column 605 through the guide hole 6023. The diameter of the guide hole 6023 is larger than the outer wall thickness of the outer ring groove 6024 and forms a strip groove passing through the inside and outside.

[0039] The working principle of a single circuit breaker is as follows:

[0040] First, the adjusting nut 603 is rotated to make the distance between the adjusting nut 603 and the bottom of the movable end 602 meet the set value of the overtravel. The adjusting nut 603 cooperates with the setting of the inner spring 610, so that even if the moving contact 4 and the stationary contact 8 are worn out after long-term use, the elastic force of the inner spring 610 and the overtravel compensation can be used to push the moving contact 4 to continue to move forward for an overtravel after completing the opening distance movement, so as to ensure that the moving contact 4 and the stationary contact 8 can fully contact each other when closing the circuit breaker, and avoid the open circuit condition of incomplete closure.

[0041] When the coil structure is charged to generate magnetic force, the movable end 602 is attracted by the magnetic ring and moves upward along the support column 605 until it is attracted to the fixed end 601. During the upward movement of the movable end 602, the inner spring 610 can be synchronously driven to move upward and be compressed, and at the same time, an upward thrust is given to the movable main shaft 607. Under the action of this thrust, the movable main shaft 607 drives the insulator 5 and the moving contact 4 to move upward until the moving contact 4 contacts the static contact 8 in the vacuum arc extinguishing chamber 9, completing the closing operation.

[0042] When the power is cut off to the coil structure, the magnetic force weakens and gradually disappears. Since the outer spring 609 is always in a compressed state, the movable end 602 is quickly separated from the fixed end 601 under the strong rebound action of the outer spring 609. When the movable end 602 moves downward along the support column 605, it first moves a preset overtravel, and then contacts the adjusting nut 603 and drives the movable main shaft 607 to move downward through the adjusting nut 603. The movable main shaft 607 can drive the moving contact 4 to quickly separate from the static contact 8 through the insulator 5 to complete the opening operation. Example 2

[0043] like Figure 8 and 9 As shown, in this embodiment, a base 10 is also included, and three single circuit breakers are installed on the base 10, and the three single circuit breakers are connected to the three-phase circuit; a controller 11 and a capacitor 12 are arranged on the base 10, and the controller 11 can control the discharge of the capacitor 12; when the capacitor 12 is discharged in the forward direction, the three single circuit breakers are synchronously closed, and when the capacitor 12 is discharged in the reverse direction, the three single circuit breakers are synchronously opened. Example 3

[0044] like Figure 2 , 3 As shown in Figure 5, in this embodiment, a synchronous coupling 7 is also included. The synchronous coupling 7 is in the shape of a sleeve with an open upper end and a closed lower end. The upper end of the synchronous coupling 7 is fixed to the lower bottom surface of the movable end head 602 by bolts. A sleeve cavity is opened in the synchronous coupling 7, and the lower end of the movable main shaft 607 and the adjusting nut 603 are arranged in the sleeve cavity; a connecting hole 701 is opened in the solid shaft part at the lower end of the synchronous coupling 7.

[0045] By improving the structure of the synchronous coupling 7, the three single circuit breakers assembled on the base 10 can adjust the position of the adjusting nut 603 on the movable main shaft 607 by conveniently disassembling the synchronous coupling 7, so as to make the synchronization rate of the three single circuit breakers higher.

[0046] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A novel high-voltage circuit breaker, comprising a single-unit circuit breaker, the single-unit circuit breaker comprising a housing (1), a stationary contact (8), a moving contact (4), a vacuum interrupter (9), an insulator (5) and a permanent magnet mechanism (6) are arranged in the housing (1), the upper end of the stationary contact (8) is connected to the upper wiring terminal (2), and the lower end of the stationary contact (8) is inserted into the vacuum interrupter (9); the lower end of the moving contact (4) is connected to the permanent magnet mechanism (6) through the insulator (5), the upper end of the moving contact (4) is slidably inserted into the vacuum interrupter (9), and the moving contact (4) is connected to the lower wiring terminal (3), characterized in that: The permanent magnet mechanism (6) comprises an upper cover (606), a lower cover (604), a movable main shaft (607), an inner spring (610), an outer spring (609), a fixed end (601), a movable end (602), a magnetic ring and a coil structure; the fixed end (601) comprises an outer pole body (6012) and an inner pole body (6011); the outer pole body (6012) and the inner pole body (6011) are coaxially fixed to the upper cover (606) from the outside to the inside. A magnetic ring is installed at the lower end of the inner pole body (6011) and the outer pole body (6012); a plurality of support columns (605) are arranged in a circular array at the lower end of the outer pole body (6012); a lower cover body (604) is fixed at the lower end of the support columns (605); a movable end head (602) is slidably sleeved on the support columns (605) between the outer pole body (6012) and the lower cover body (604); and a coil structure is arranged on the inner wall of the movable end head (602); The movable main shaft (607) passes through the upper cover body (606), the fixed end head (601), the movable end head (602) and the lower cover body (604) from top to bottom. The movable main shaft (607) is located in the fixed end head (601) and an annular boss is arranged on the outer wall of the shaft body. An inner spring (610) is mounted on the movable main shaft (607). The upper end of the inner spring (610) is pressed against the annular boss, and the lower end of the inner spring (610) is pressed against the movable end head (602). ); an outer spring (609) is sleeved outside the inner spring (610), the upper end of the outer spring (609) is pressed against the upper cover (606) or the fixed end (601), and the lower end of the outer spring (609) is pressed against the movable end (602); the upper end of the movable main shaft (607) is connected to the movable contact (4) via an insulator (5), and an adjusting nut (603) is threadedly mounted on the outer wall of one end of the movable main shaft (607) that passes through the movable end (602) downward.

2. A novel high voltage circuit breaker according to claim 1, characterized in that: The coil structure comprises a coil support (611), on which a coil winding group is wound.

3. A novel high voltage circuit breaker according to claim 1, characterized in that: The magnetic ring comprises more than three permanent magnet blocks (608), and the permanent magnet blocks (608) are arranged in a ring array around the central axis of the inner body.

4. A novel high voltage circuit breaker according to claim 1, characterized in that: A copper sleeve is fixed below the upper cover (606), the upper end of the outer spring (609) is pressed against the copper sleeve, and the lower end of the outer spring (609) is pressed against the movable end (602); the inner spring (610) and the outer spring (609) are coaxially sleeved and do not interfere with each other during the expansion and contraction process.

5. A novel high voltage circuit breaker according to claim 1, characterized in that: The movable end head (602) is in the shape of a ring. A through hole (6021) matching the movable main shaft (607) is provided on the central axis of the movable end head (602). An inner ring groove (6022) and an outer ring groove (6024) with an open upper end are coaxially provided on the movable end head (602) from the outside to the inside. The lower ends of the inner spring (610) and the outer spring (609) are pressed against the lower bottom surface of the inner ring groove (6022), and the coil structure is arranged in the outer ring groove (6024).

6. A novel high voltage circuit breaker according to claim 5, characterized in that: The movable end head (602) is provided with guide holes (6023) penetrating up and down and matching the number and position of the support column (605), and the movable end head (602) is slidably mounted on the support column (605) through the guide holes (6023); the diameter of the guide holes (6023) is larger than the outer wall thickness of the outer ring groove (6024) and forms a strip-shaped slot penetrating inside and outside.

7. A novel high voltage circuit breaker according to claim 1, characterized in that: The invention also comprises a synchronous coupling (7), wherein the synchronous coupling (7) is in the shape of a sleeve with an open upper end and a closed lower end, the upper end of the synchronous coupling (7) is fixed to the lower bottom surface of the movable end head (602) by means of bolts, a sleeve cavity is provided in the synchronous coupling (7), the lower end of the movable main shaft (607) and the adjusting nut (603) are arranged in the sleeve cavity; and a connecting hole (701) is provided in the solid shaft portion at the lower end of the synchronous coupling (7).

8. A novel high voltage circuit breaker according to claim 1, characterized in that: It also includes a base (10), on which three single-cell circuit breakers are mounted, and the three single-cell circuit breakers are connected to a three-phase circuit; a controller (11) and a capacitor (12) are arranged on the base (10), and the controller (11) can control the discharge of the capacitor (12); when the capacitor (12) is discharged in the forward direction, the three single-cell circuit breakers are synchronously closed, and when the capacitor (12) is discharged in the reverse direction, the three single-cell circuit breakers are synchronously opened.

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