Quick switch

Abstract

The utility model provides a quick switch, and belongs to the technical field of power switch equipment. The quick on-off device is simplified, and the size of the quick on-off device is shortened. A quick switch comprises a pull rod, one end of the pull rod is connected with an arc extinguish chamber, the other end of the pull rod is connected with a movable iron core moving up and down, a permanent magnet, a closing coil driving the movable iron core to move and a repulsion coil are arranged above the movable iron core, a diamagnetic repulsion disc is fixedly arranged on the movable iron core, and the repulsion disc is located in the middle of the movable iron core. The edge of the movable iron core is arranged opposite to the permanent magnet, the closing coil and the repulsive force coil are arranged in an up-down stacked mode, and the permanent magnet is arranged in the peripheral direction of the closing coil and the repulsive force coil. The closing coil, the repulsive force coil and the permanent magnet are integrated right above the movable iron core, the repulsive force coil is matched with the repulsive force disc, the movable iron core is rapidly pushed to move downwards to be separated, the structure is simplified, and meanwhile the size of equipment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power switchgear technology, and specifically to a fast switch. Background Technology

[0002] In power systems, the ability to quickly and reliably disconnect and connect circuits is crucial for ensuring the safe and stable operation of the system. Among them, fast-acting switches (or fast vacuum switches) are widely used in DC power distribution, flexible DC transmission, fault current limiting and other applications with extremely high requirements for breaking speed due to their ability to quickly cut off fault current. They mainly bear the core responsibility of carrying current under normal circuit conditions and quickly and reliably cutting off current under fault conditions (such as short circuit and overload). Their performance directly affects the stability of the entire power grid and the reliability of power supply. With the continuous development of modern power systems, higher requirements have been placed on the switching speed of contactors. In particular, the speed of starting the tripping operation from the issuance of a fault signal to the separation of contacts has become a key factor in determining the success or failure of short circuit current disconnection. In order to improve the switching speed, the existing technology usually uses a four-bar linkage mechanism with springs and hinges as a fast switching device, which achieves the cutting off through the release of mechanical energy. However, this solution has a certain inertial delay and a large impact. In addition, because an additional spring is required, its axial dimension is too long. The related components used to implement this structure are also too complex, resulting in high cost and failure rate, which affects the overall rigidity of the vacuum contactor and its long-term reliability. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a fast switch. The technical problem this invention aims to solve is: how to simplify the fast switching device and shorten its size.

[0004] The objective of this utility model can be achieved through the following technical solution: A fast switch includes a pull rod connected at one end to an arc-extinguishing chamber, and a moving iron core that moves up and down connected at the other end of the pull rod. A permanent magnet, a closing coil for driving the moving iron core, and a repulsion coil are provided above the moving iron core. The moving iron core is characterized in that a repulsion disk with antimagnetic properties is fixed on it. The repulsion disk is located in the middle of the moving iron core and is arranged opposite to the repulsion coil. The edge of the moving iron core is arranged opposite to the permanent magnet. The closing coil and the repulsion coil are stacked vertically. The permanent magnet is located on the outer periphery of the closing coil and the repulsion coil.

[0005] This application, based on existing fast switches, employs a combination of permanent magnets and electromagnetic coils to drive the moving iron core to move rapidly up and down. It uses direct electromagnetic drive for switching on and off, energizing coils at different positions to switch between opening and closing, simplifying the mechanical structure of the cutting device. Specifically, a permanent magnet is placed around the closing coil. When the closing coil is energized, attracting the moving iron core upwards, the permanent magnet assists in the attraction, increasing the upward speed of the moving iron core and maintaining the closed state after the closing coil is de-energized. Furthermore, this application also places a repulsion coil below the closing coil. By positioning the repulsion coil opposite a repulsion disk with antimagnetic properties, energizing the repulsion coil rapidly pushes the repulsion disk downwards, completing the unlocking process.

[0006] It is worth mentioning that, based on this, this application further reduces the size of the cutting device by stacking the closing coil and the repulsion coil on top of each other, placing the permanent magnet around the closing coil and the repulsion coil, and placing the repulsion disk on the moving iron core.

[0007] In the aforementioned fast switch, the repulsion coil is sandwiched between the closing coil and the moving iron core, and is positioned opposite to the repulsion disk. By positioning the repulsion coil between the closing coil and the moving iron core, allowing it to be positioned opposite the repulsion disk, the principle of like poles repelling can be utilized to push the repulsion disk and the moving iron core downwards rapidly, thereby extending their service life.

[0008] In the aforementioned fast switch, the fast on / off device further includes a control circuit. This control circuit is electrically connected to both the closing coil and the repulsion coil. The control circuit controls the energization of either the closing coil or the repulsion coil, driving the moving iron core to move up and down. By controlling the timing of energizing the opening coil or the repulsion coil through the control circuit, efficient opening and closing of the circuit are ensured.

[0009] In the aforementioned fast switch, a tripping coil is also provided circumferentially around the closing coil and the repulsion coil, and the tripping coil is located above the permanent magnet.

[0010] In the aforementioned fast switch, the moving iron core is provided with a guide sleeve, which is located between the pull rod and the repulsion plate. Both the repulsion coil and the trip coil have guide holes located in the center, and the guide sleeve cooperates with these guide holes. The guide sleeve prevents relative displacement of the moving iron core during its up-and-down movement, thus improving the reliability of the drive.

[0011] In the aforementioned fast switch, the fast on / off device further includes a mounting plate and a limiting plate. The limiting plate and the mounting plate are connected by a support column. The closing coil and the repulsion coil are fixed on the mounting plate, and the moving iron core is located between the limiting plate and the repulsion coil. Connecting the mounting plate and the limiting plate by the support column prevents excessive travel of the moving iron core.

[0012] In the aforementioned fast switch, the repulsion coil is a planar helical coil, and a receiving groove for accommodating the planar helical coil is provided below the closing coil.

[0013] In the aforementioned fast switch, when the arc-extinguishing chamber is disconnected, a gap exists between the moving iron core and the permanent magnet, and this gap is connected to the outside environment. By connecting this gap to the outside environment, the impact caused by the upward movement of the moving iron core is reduced.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This solution concentrates the closing coil and repulsion coil above the moving iron core, and places permanent magnets around the closing coil and repulsion coil. The closing coil and permanent magnet work together to drive the moving iron core upward and maintain the closed state using the permanent magnet. The repulsion coil and the repulsion disk on the moving iron core are positioned opposite each other. The repulsion coil pushes the moving iron core with the repulsion disk to quickly separate, thus completing the circuit breaker opening. This eliminates the need for mechanical structures and shortens the volume of the rapid cut-off mechanism. Attached Figure Description

[0016] Figure 1 This is a 3D exploded view of this quick switch;

[0017] Figure 2 This is a 3D exploded view of this quick switch;

[0018] Figure 3 This is a cross-sectional view of the fast switch in the open state;

[0019] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0020] Figure 5 This is a cross-sectional view of the fast switch in the closed state;

[0021] In the diagram, 1. Arc-extinguishing chamber; 2. Pull rod; 3. Moving iron core; 3a. Repulsion plate; 3b. Guide sleeve; 3c. Magnetic suction part; 4. Closing coil; 4a. Guide hole; 4b. Receiving groove; 4c. Shielding cover; 5. Repulsion coil; 6. Permanent magnet; 7. Opening coil; 8. Spacing; 9. Mounting plate; 10. Limiting plate; 11. Support column; Detailed Implementation

[0022] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings. In this application, the fast switch is applied to a vacuum contactor as an example, but the present invention is not limited to these embodiments.

[0023] like Figure 1 and Figure 2 The diagram shows a quick switch, including an arc-extinguishing chamber 1 and a quick-connection device. The arc-extinguishing chamber 1 and the quick-connection device are connected by a pull rod 2. The quick-connection device includes a mounting plate 9, a limiting plate 10, and a moving iron core 3. The moving iron core 3 is located between the mounting plate 9 and the limiting plate 10. The mounting plate 9 and the limiting plate 10 are connected by a support column 11. The moving iron core 3 is provided with a repulsion disk 3a and a guide sleeve 3b. The guide sleeve 3b is located in the middle of the moving iron core 3 and coincides with the central axis of the pull rod 2.

[0024] It is worth mentioning that, such as Figure 2 As shown, the quick switching device also includes a repulsion coil 5 and a closing coil 4. The closing coil 4 and the repulsion coil 5 are stacked one on top of the other. Permanent magnets 6 and opening coils 7 are arranged around the closing coil 4 and the repulsion coil 5. The repulsion coil 5 and the closing coil 4 are located directly above the repulsion disk 3a. The permanent magnets 6 and the opening coils 7 are located directly above the moving iron core 3. The permanent magnets 6 are located directly above the magnetic attraction part 3c on the edge of the moving iron core 3. The central axis of the above components coincides with the central axis of the moving iron core 3 and the pull rod 2.

[0025] like Figure 3 , Figure 4 as well as Figure 5 As shown, a guide hole 4a is provided in the middle of the closing coil 4. The guide hole 4a cooperates with the guide sleeve 3b on the moving iron core 3. The pull rod 2 is located inside the guide sleeve 3b, and the repulsion disk 3a is sleeved outside the guide sleeve 3b and fixed to the upper end face of the moving iron core 3. The closing coil 4 is located above the repulsion coil 5 and has a receiving groove 4b at the bottom to accommodate the repulsion coil 5. The repulsion coil 5 is a planar helical coil. The repulsion coil 5 and the repulsion disk 3a are arranged opposite each other. The permanent magnet 6 is separated from the closing coil 4 and the repulsion coil 5 by a shield 4c. The permanent magnet 6 and the opening coil 7 are provided around the closing coil 4 and the repulsion coil 5. The opening coil 7 is located above the permanent magnet 6.

[0026] like Figure 4 As shown, when the quick-cut-off switch is in the cut-off state, there is a certain distance 8 between the moving iron core 3 and the repulsion disk 3a and the permanent magnet 6 and the repulsion coil 5, and they are connected to the outside world through the distance 8 between the support columns 11.

[0027] like Figure 5As shown, when the quick-cut-off switch is in the energized state, the moving iron core 3 and the repulsion disk 3a move upward, the guide sleeve 3b is fully inserted into the guide hole 4a on the closing coil 4, and the upper surface of the repulsion disk 3a contacts the lower surface of the repulsion coil 5.

[0028] In summary, this application, based on existing mechanical structures that use electromagnets in conjunction with springs to achieve rapid release, adopts a purely electromagnetic control scheme. Existing schemes that combine electromagnetic and mechanical structures to achieve on / off switching typically require numerous mechanical parts to achieve rapid switching. During use, these parts are susceptible to damage due to impacts caused by significant inertial forces, and require sufficient space for normal operation, resulting in a relatively large size. To address these issues, this application provides a purely electromagnetic control scheme. Building upon existing methods that separately control the opening coil 7 and closing coil 4 via control circuits, an additional repulsive coil 5 using a planar helical coil is added. In conjunction with the antimagnetic repulsion disk 3a, during the cutting-off process, the repulsion coil 5 pushes the repulsion disk 3a downward, accelerating the separation of the magnetic attraction part 3c at the edge of the moving iron core 3 from the permanent magnet 6. Specifically, when the fast switching device is in the closed state and the repulsion coil 5 is energized to form an electromagnet, according to Lenz's law, since the repulsion disk 3a is made of antimagnetic copper, a magnetic field opposite to that of the electromagnet will be formed on the repulsion disk 3a when it is in the closed state. Under the repulsive action of the two magnetic fields with the same poles, the moving iron core 3 is pushed downward to separate from the permanent magnet 6, which increases the disconnection speed of the fast switching device, simplifies the mechanical structure of the fast switching device, and improves the stability of use.

[0029] There is a gap between the trip coil 7 and the permanent magnet 6. After the trip coil 7 is energized, it attracts the permanent magnet 6 to move upward, causing the permanent magnet 6 to separate from the moving iron core 3. In the conducting state, there is a certain distance between the permanent magnet 6 and the magnetic attraction part 3c.

[0030] More importantly, this application also stacks the closing coil 4 and the repulsion coil 5 vertically, and provides a receiving groove 4b below the closing coil 4 to house the repulsion coil 5. This prevents relative displacement of the repulsion coil 5. By using a planar helical coil as the repulsion coil 5, not only can the repulsion disk 3a be ensured to work normally, but the axial dimension of the repulsion disk 3a can also be further shortened. Furthermore, this application directly places the permanent magnet 6 and the opening coil 7 outside the closing coil 4 and the repulsion coil 5, and places the permanent magnet 6 and... The tripping coil 7 is separated from the closing coil 4 and the repulsion coil 5 by a shield 4c, reducing the influence of the magnetic field of the permanent magnet 6 on the coil. The closing coil 4, the repulsion coil 5, the permanent magnet 6, and the tripping coil 7 are concentrated above the moving iron core 3 and the repulsion disk 3a. The tripping coil 7 and the permanent magnet 6 are arranged around the closing coil 4 and the repulsion coil 5. Based on satisfying the requirements of fast closing, closing holding, and fast tripping, the axial dimension of the fast switching device is shortened and the structure is simplified by the reasonable arrangement of the above coils and the permanent magnet 6.

[0031] In addition, the moving iron core 3 is provided with a guide sleeve 3b. When the driving iron core 3 moves up and down, it can cooperate with the guide sleeve 3b through the guide hole 4a to avoid large displacement of the moving iron core 3 during the up and down movement, thereby improving the reliability of use.

[0032] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0033] Although this document frequently uses terms such as 1. arc-extinguishing chamber; 2. pull rod; 3. moving iron core; 3a. repulsion disk; 3b. guide sleeve; 3c. magnetic suction part; 4. closing coil; 4a. guide hole; 4b. receiving groove; 4c. shielding cover; 5. repulsion coil; 6. permanent magnet; 7. opening coil; 8. spacing; 9. mounting plate; 10. limiting plate; 11. support column, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

Claims

1. A fast switch, comprising an arc-extinguishing chamber (1) and a pull rod (2) connected at one end to the arc-extinguishing chamber (1), wherein the other end of the pull rod (2) is connected to a movable iron core (3) that moves up and down, and a permanent magnet (6), a closing coil (4) for driving the movable iron core (3) to move, and a repulsion coil (5) are provided above the movable iron core (3), characterized in that, The moving iron core (3) is fixed with a repulsion disk (3a) with antimagnetic properties. The repulsion disk (3a) is located in the middle of the moving iron core (3) and is arranged opposite to the repulsion coil (5). The edge of the moving iron core (3) is arranged opposite to the permanent magnet (6). The closing coil (4) and the repulsion coil (5) are stacked on top of each other. The permanent magnet (6) is located on the outer periphery of the closing coil (4) and the repulsion coil (5).

2. A fast switch according to claim 1, characterized in that, The repulsion coil (5) is sandwiched between the closing coil (4) and the moving iron core (3), and is positioned opposite to the repulsion disk (3a).

3. A fast switch according to claim 2, characterized in that, The quick switching device also includes a control circuit, which is electrically connected to the closing coil (4) and the repulsion coil (5) respectively. The control circuit is used to control the energization of the closing coil (4) or the repulsion coil (5) and drive the moving iron core (3) to move up and down.

4. A fast switch according to claim 3, characterized in that, The closing coil (4) and the repulsion coil (5) are also provided with a closing coil (7) around their circumference, and the closing coil (7) is located above the permanent magnet (6).

5. A quick switch according to any one of claims 1 to 4, characterized in that, The moving iron core (3) is provided with a guide sleeve (3b), which is located between the pull rod (2) and the repulsion disk (3a). The closing coil (4) is provided with a guide hole (4a) located in the middle, and the guide sleeve (3b) cooperates with the guide hole (4a).

6. A fast switch according to any one of claims 1 to 4, characterized in that, The quick switching device also includes a mounting plate (9) and a limiting plate (10). The limiting plate (10) and the mounting plate (9) are connected by a support column (11). The closing coil (4) and the repulsion coil (5) are fixed on the mounting plate (9). The moving iron core (3) is located between the limiting plate (10) and the repulsion coil (5).

7. A fast switch according to claim 6, characterized in that, The repulsion coil (5) is a planar helical coil, and a receiving groove (4b) for accommodating the planar helical coil is provided below the closing coil (4).

8. A fast switch according to claim 6, characterized in that, When the arc-extinguishing chamber (1) is disconnected, there is a gap (8) between the moving iron core (3) and the permanent magnet (6), and the gap (8) is connected to the outside.

9. A fast switch according to claim 1, characterized in that, The repulsion coil (5) and the closing coil (4) are covered with a shield (4c), which is used to block the permanent magnet (6) from the closing coil (4).

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