A three-position isolating grounding switch with a flexible magnetic control mechanism

Abstract

The present invention relates to the technical field of high-voltage switches, and in particular to a three-station isolating grounding switch containing a flexible magnetic control mechanism. The problem that the existing three-station isolating grounding switch requires high precision during assembly, resulting in a slow assembly speed. It includes a fixed shell, the fixed shell is fixedly connected to a fixed plate through a support rod, the fixed plate is fixedly connected to a grounding contact and a connecting contact, the fixed plate is slidably connected to a driving rod, the driving rod is fixedly connected to a sliding cylinder, the sliding cylinder is slidably connected to an insulating rod on the side away from the fixed plate, the insulating rod is fixedly connected to a moving contact, the grounding contact and the connecting contact are both in contact and cooperation with the moving contact, and the insulating rod is rotatably connected to a sliding member. The present invention reduces the difficulty of adjusting the stroke of the driving rod by sliding the sliding member and the insulating rod in the sliding cylinder, saves the time for adjusting the stroke of the driving rod, and quickly completes the assembly process while ensuring the tightness of the fit between the two contacts.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switches, and in particular to a three-position isolating grounding switch containing a flexible magnetic control mechanism. Background Art

[0002] The three-position isolating grounding switch is a mechanical switch commonly used in circuits for closing and opening. The three-position isolating grounding switch is divided into two types: swing type and direct-acting type. The direct-acting three-position isolating grounding switch has a high development prospect due to its advantages such as fewer transmission parts required, simple and efficient stroke, small occupied space, easy sealing and easy production of integrated electrode columns. The direct-acting three-position isolating grounding switch usually needs to adjust the stroke of its internal components during installation. Different strokes are designed for different circuits to ensure that the switch can correctly reach the predetermined position and ensure that there is sufficient contact pressure between adjacent contacts to ensure that adjacent contacts maintain good electrical connection. The existing direct-acting three-station isolating grounding switch is usually wrapped with a sealing layer at the closing point, which is used to slow down the aging rate of components and thereby increase the service life of the device. However, due to the high assembly precision required for the three-station isolating grounding switch and the presence of the sealing layer, the interior of the three-station isolating grounding switch is in a closed state, making it difficult for workers to adjust its internal stroke. During the assembly process, workers can only judge whether the internal components are tightly matched by feeling the pressure transmitted by the internal components during the movement, resulting in a lot of time wasted when workers precisely adjust the stroke of the three-station isolating grounding switch, making it difficult to quickly complete the assembly process. Summary of the invention

[0003] In order to overcome the disadvantages of the existing three-station isolating and grounding switch that high precision is required during assembly, resulting in slow assembly speed, the present invention provides a three-station isolating and grounding switch with a flexible magnetic control mechanism.

[0004] The technical solution is as follows: A three-position isolating grounding switch containing a flexible magnetic control mechanism, comprising a fixed shell, the fixed shell is fixedly connected to a fixed plate through a support rod, the fixed plate is fixedly connected to a grounding contact and a connecting contact, the fixed plate is slidably connected to a driving rod, the driving rod is fixedly connected to a sliding cylinder on a side close to the fixed shell, the sliding cylinder is slidably connected to an insulating rod on a side away from the fixed plate, the insulating rod is fixedly connected to a moving contact, the grounding contact and the connecting contact are both in contact and cooperation with the moving contact, the insulating rod is rotatably connected to a sliding member, the sliding member is slidably connected to the driving rod, the sliding cylinder is slidably connected to the sliding member, a first elastic member is installed between the sliding cylinder and the sliding member, and a flexible magnetic control mechanism for driving the driving rod to slide is provided on the side of the fixed plate away from the fixed shell.

[0005] Preferably, the insulating rod is located in the sliding cylinder and is provided with three groups of through holes distributed circumferentially, each group includes symmetrically distributed through holes, the three groups of through holes on the insulating rod are respectively a first through hole, a second through hole and a third through hole, and the sliding part is provided with a symmetrically distributed fourth through hole, the first through hole, the second through hole and the third through hole are all connected and cooperated with the adjacent fourth through hole, and the first through hole and the third through hole are provided with a one-way valve.

[0006] Preferably, a limiting cylinder is fixedly connected to one side of the fixed shell close to the sliding cylinder, the limiting cylinder is in contact with the sliding cylinder, a connecting piece is connected to the limiting rotation inside the driving rod, the connecting piece is splined to the sliding piece, and the limiting cylinder is provided with symmetrically distributed sliding grooves, and the sliding grooves on the limiting cylinder are in limiting cooperation with the connecting piece.

[0007] Preferably, the flexible magnetic control mechanism includes a fixed rod evenly distributed in the circumferential direction, the fixed rod is fixed to the fixed plate, the fixed rod is threadedly connected with a threaded cylinder, the threaded cylinders evenly distributed in the circumferential direction are jointly limited and slidably connected with a sliding plate, a first static magnetic core is fixedly connected to a side of the fixed plate close to the sliding plate, a first moving magnetic core is fixedly connected to a side of the sliding plate close to the fixed plate, the first static magnetic core and the first moving magnetic core are magnetically matched, an adjusting bolt is threadedly connected to a side of the driving rod close to the sliding plate, a second static magnetic core is fixedly connected to a side of the sliding plate away from the fixed plate, the adjusting bolt is rotatably connected to the second moving magnetic core, the driving rod penetrates the sliding plate, the first static magnetic core, the first moving magnetic core and the second static magnetic core, the second static magnetic core and the second moving magnetic core are magnetically matched, an excitation coil is installed in each of the first static magnetic core and the second static magnetic core, a second elastic member is installed between the first static magnetic core and the first moving magnetic core, and a third elastic member is installed between the second static magnetic core and the second moving magnetic core.

[0008] Preferably, the first static magnetic core and the second static magnetic core are made of flexible magnetron materials with low demagnetization rate, and are easy to be excited and demagnetized by the excitation coil.

[0009] Preferably, the elastic force of the second elastic member is greater than the elastic force of the third elastic member, and the second elastic member and the third elastic member are both in a compressed state in initial states.

[0010] Preferably, the fixed plate is fixedly connected to a first magnetic shielding cover, the sliding plate is fixedly connected to a second magnetic shielding cover and a third magnetic shielding cover, the first static magnetic core and the first moving magnetic core are located between the first magnetic shielding cover and the second magnetic shielding cover, the first magnetic shielding cover and the second magnetic shielding cover are slidably connected, and the second static magnetic core and the second moving magnetic core are located in the third magnetic shielding cover.

[0011] Preferably, the first magnetic shielding cover and the second magnetic shielding cover are combined into an eggshell shape, and the third magnetic shielding cover is also in an eggshell shape.

[0012] Preferably, a guiding mechanism for guiding the moving contact is further included, the guiding mechanism is arranged in the fixed shell, the guiding mechanism includes a sliding shell, the sliding shell is slidably connected to the outer side of the moving contact, a symmetrically distributed fixing ring is fixedly connected to a side of the fixed shell close to the sliding shell, the fixing ring is slidably connected to an extrusion ring, the sliding shell is fixed with symmetrically distributed sliding blocks, the sliding blocks are slidably and extrusion-fitted with the symmetrically distributed extrusion rings, and the fourth elastic member is installed between the fixed ring and the adjacent extrusion ring.

[0013] Preferably, a ball is installed in the sliding shell, and the sliding shell is slidingly connected to the moving contact through the ball inside it. A ball is slidingly connected on the extrusion ring, and the extrusion ring is slidingly connected to the adjacent sliding block through the ball on it, and there is damping between the sliding block and the adjacent ball.

[0014] The beneficial effects of the present invention are as follows: the present invention reduces the difficulty of adjusting the stroke of the driving rod by sliding the sliding member and the insulating rod in the sliding cylinder, saves the time of adjusting the stroke of the driving rod, quickly completes the assembly process, and ensures the tightness of the fit between the two contacts.

[0015] The present invention controls two excitation coils to excite and demagnetize adjacent first static magnetic cores and adjacent second static magnetic cores, and utilizes the magnetic force of the first static magnetic core and the second static magnetic core to drive the driving rod to move. The operation delay is small and the operation accuracy is high, and it is suitable for occasions with fast operation requirements.

[0016] The present invention controls the straightness of the movement of the moving contact by means of components such as a sliding shell, and reduces the wear between the moving contact and the grounding contact and the connecting contact under the premise of assembly errors, thereby ensuring the stable operation of the device and further improving the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0018] Figure 2 It is a three-dimensional structural schematic diagram of the fixed shell, the grounding contact and the connecting contact of the present invention;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the fixed shell, the grounding contact and the moving contact of the present invention;

[0020] Figure 4 It is a cross-sectional view of the fixed shell, the grounding contact and the connecting contact of the present invention;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the driving rod, the sliding cylinder and the insulating rod of the present invention;

[0022] Figure 6 An exploded view of the driving rod, the insulating rod and the sliding member of the present invention;

[0023] Figure 7 is a cross-sectional view of the fixed plate, the sliding plate and the third magnetic shielding cover of the present invention;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the second static magnetic core, the second moving magnetic core and the third magnetic shielding cover of the present invention;

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the second static magnetic core, the second moving magnetic core and the excitation coil of the present invention;

[0026] Fig.10 It is a three-dimensional structural schematic diagram of the grounding contact, the connecting contact and the insulating rod of the present invention;

[0027] Fig.11 It is a schematic diagram of the three-dimensional structure of the fixing ring, the extrusion ring and the sliding block of the present invention;

[0028] Fig.12 It is an exploded view of the fixing ring, the extrusion ring and the sliding block of the present invention.

[0029] Explanation of the accompanying drawings: 1-fixed shell, 2-fixed plate, 3-grounding contact, 4-connecting contact, 5-driving rod, 6-sliding cylinder, 7-insulating rod, 71-first through hole, 72-second through hole, 73-third through hole, 8-moving contact, 9-sliding member, 91-fourth through hole, 10-first elastic member, 11-limiting cylinder, 12-connecting member, 20-fixed rod, 21-threaded cylinder, 22-sliding plate, 23-first static magnetic core, 24-first moving magnetic core, 25-adjusting bolt, 26-second static magnetic core, 27-second moving magnetic core, 28-excitation coil, 29-second elastic member, 30-third elastic member, 31-first magnetic shielding cover, 32-second magnetic shielding cover, 33-third magnetic shielding cover, 40-sliding shell, 41-fixing ring, 42-extrusion ring, 43-sliding block, 44-fourth elastic member. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0031] Embodiment 1: Because the existing direct-acting three-station isolating grounding switch requires high assembly precision, before installing the three-station isolating grounding switch, it is necessary to adjust the formation of the components in the three-station isolating grounding switch according to the specific installation situation to ensure that the three contacts in the three-station isolating grounding switch are closely matched during the connection process, thereby ensuring that the three contacts in the three-station isolating grounding switch maintain a good electrical connection when in contact. However, the status of the components in the existing three-station isolating grounding switch is not easy for the staff to observe, which makes it difficult for the staff to quickly complete the steps of adjusting the stroke of the three-station isolating grounding switch, which in turn makes the structure of the existing three-station isolating grounding switch not easy to quickly complete assembly.

[0032] In view of the above problems, the present invention proposes a three-position isolating grounding switch with a flexible magnetic control mechanism. Figure 1-Figure 6 As shown, it includes a fixed shell 1, a fixed plate 2 is fixedly connected to the right side of the fixed shell 1 through a support rod, a grounding contact 3 and a connecting contact 4 are fixedly connected to the left side of the fixed plate 2, the grounding contact 3 is used to connect the circuit, and the connecting contact 4 short-circuits the circuit to the ground, thereby discharging the residual charge in the circuit, thereby increasing the safety of the maintenance personnel in repairing the circuit, a driving rod 5 is slidably connected in the fixed plate 2, a sliding cylinder 6 is fixedly connected to the left side of the driving rod 5, an insulating rod 7 is slidably connected to the left side of the sliding cylinder 6, a moving contact 8 is fixedly connected to the left side of the insulating rod 7, and the moving contact 8 is controlled to contact with the grounding contact 3 or the connecting contact 4 to control the specific connection state of the circuit. When the moving contact 8 contacts the grounding contact 3, the moving contact 8 is in the grounding position, and when the grounding contact 3 and the connecting contact 4 are not in contact with the moving contact 8, the moving contact 8 is in the isolation position, and the moving contact 8 is in contact with the grounding contact 3. When the connecting contact 4 is in contact, the moving contact 8 is in the connecting position, and the right side of the insulating rod 7 is rotatably connected with a sliding member 9, the sliding member 9 is slidably connected to the driving rod 5, the sliding cylinder 6 is slidably connected to the sliding member 9, and a first elastic member 10 is installed between the sliding cylinder 6 and the sliding member 9. The first elastic member 10 is a spring, and the first elastic member 10 is initially in a stretched and force-storing state. The moving contact 8 is provided with two inclined surfaces symmetrically distributed on the left and right, and the grounding contact 3 and the connecting contact 4 are both squeezed and matched with the adjacent inclined surfaces on the moving contact 8 to increase the coaxiality between the moving contact 8 and the grounding contact 3 and the connecting contact 4, and ensure the connection strength between the moving contact 8 and the grounding contact 3 and the connecting contact 4. A circular contact is provided on the left side of the moving contact 8 to facilitate electrical connection between the two, and a flexible magnetic control mechanism is provided on the right side of the fixed plate 2 to drive the driving rod 5 to slide.

[0033] refer to Figure 5 and Figure 6As shown, the insulating rod 7 is located in the sliding cylinder 6 and is provided with three groups of through holes distributed circumferentially, each group includes two through holes distributed symmetrically, the three groups of through holes on the insulating rod 7 are respectively a first through hole 71, a second through hole 72 and a third through hole 73, and the sliding member 9 is provided with two fourth through holes 91 distributed symmetrically, when the moving contact 8 is near the connecting position, the first through hole 71 is communicated and matched with the adjacent fourth through hole 91, and a one-way valve is provided in the first through hole 71 to prevent the liquid from moving from the right part of the first through hole 71 to the left, when the moving contact 8 is near the isolation position, the second through hole 72 is communicated and matched with the adjacent fourth through hole 91, and when the moving contact 8 is near the grounding position, the third through hole 73 is communicated and matched with the adjacent fourth through hole 91. The hole 91 is connected and matched, and the third through hole 73 is provided with a one-way valve for preventing the liquid from flowing from the right to the left through the third through hole 73. The right side of the fixed shell 1 is fixedly connected to the limiting cylinder 11, and the limiting cylinder 11 is in contact with the sliding cylinder 6. The driving rod 5 is connected with a connecting member 12 for limited rotation. The connecting member 12 is splined with the sliding member 9. Two symmetrically distributed slide grooves are provided in the limiting cylinder 11, and the slide grooves are composed of a left straight groove, a left oblique groove, a middle straight groove, a right oblique groove, and a right straight groove. The left straight groove, the middle straight groove and the right straight groove respectively correspond to the connecting station, the isolation station and the grounding station. The slide groove on the limiting cylinder 11 is limited and matched with the connecting member 12 to control the connecting member 12 to rotate at an appropriate position.

[0034] refer to Figure 7-Figure 9As shown, the flexible magnetic control mechanism includes four fixed rods 20 evenly distributed in the circumferential direction, the four fixed rods 20 are all fixedly connected to the right side of the fixed plate 2, the right side of the fixed rod 20 is threadedly connected with a threaded cylinder 21, the four threaded cylinders 21 are commonly connected with a sliding plate 22 in a limited sliding manner, the right side of the fixed plate 2 is fixedly connected with a first static magnetic core 23, the left side of the sliding plate 22 is fixedly connected with a first moving magnetic core 24, the first static magnetic core 23 and the first moving magnetic core 24 are magnetically matched, the right side of the driving rod 5 is threadedly connected with an adjusting bolt 25 and a fastening bolt, the fastening bolt The bolt is used to limit the adjustment bolt 25. The right side of the sliding plate 22 is fixedly connected to the second static magnetic core 26. The adjustment bolt 25 is rotatably connected to the second moving magnetic core 27. The driving rod 5 penetrates the sliding plate 22, the first static magnetic core 23, the first moving magnetic core 24 and the second static magnetic core 26. The second static magnetic core 26 and the second moving magnetic core 27 are magnetically matched. The first static magnetic core 23 and the second static magnetic core 26 are both installed with an excitation coil 28. The excitation coil 28 is electrically connected to the external control terminal. The first static magnetic core 23 and the second static magnetic core 26 are flexible. The magnetic control material (flexible magnetic control material is a new type of magnetic control material, which has the characteristics of unlimited theoretical magnetic life, easy excitation and demagnetization, and extremely low natural demagnetization rate) is easy to be excited and demagnetized through the excitation coil 28. The flexible magnetic control material has low operating power consumption, which is conducive to integrated design with the drive module. The structure is relatively compact and friendly to the primary and secondary fusion of the electrode column. The first static magnetic core 23 and the first moving magnetic core 24 are slidably connected by a limit pin. A second elastic member 29 is installed between the first static magnetic core 23 and the first moving magnetic core 24. The second elastic member 29 is a spring, and the second static magnetic core 26 is slidably connected to the second moving magnetic core 27 by a limit pin. A third elastic member 30 is installed between the second static magnetic core 26 and the second moving magnetic core 27. The third elastic member 30 is a spring. The elastic force of the second elastic member 29 is greater than the elastic force of the third elastic member 30, and the initial states of the second elastic member 29 and the third elastic member 30 are both in a compressed state, which is used to ensure that when the first static magnetic core 23 is not excited, the distance between the first static magnetic core 23 and the first moving magnetic core 24 is always maintained at the farthest state.

[0035] refer to Figure 7-Figure 9 As shown, a first magnetic shielding cover 31 is fixedly connected to the right side of the fixed plate 2, a second magnetic shielding cover 32 is fixedly connected to the left side of the sliding plate 22, a third magnetic shielding cover 33 is fixedly connected to the right side of the sliding plate 22, the first static magnetic core 23 and the first moving magnetic core 24 are located between the first magnetic shielding cover 31 and the second magnetic shielding cover 32, the first magnetic shielding cover 31 and the second magnetic shielding cover 32 form an eggshell shape to protect internal components from the influence of the external magnetic field, the first magnetic shielding cover 31 and the second magnetic shielding cover 32 are slidably connected, the second static magnetic core 26 and the second moving magnetic core 27 are located in the third magnetic shielding cover 33, and the third magnetic shielding cover 33 is in the shape of an eggshell, which is used to protect internal components from the influence of the external magnetic field.

[0036] The staff installs the device on the control console of the circuit, and then the staff rotates the four threaded cylinders 21 at the same time, and the threaded cylinder 21 moves left and right along the thread between it and the fixed rod 20, changing the position where the threaded cylinder 21 limits the sliding plate 22, thereby changing the stroke length of the sliding plate 22, that is, the distance between the first static magnetic core 23 and the first moving magnetic core 24 (at this time, the first static magnetic core 23 and the first moving magnetic core 24 are always kept at the farthest position at this time under the action of the second elastic member 29), so that the stroke of the sliding plate 22 adapts to the distance between the isolation station in the fixed shell 1 and the connecting contact 4 (connecting station). When the staff adjusts the four threaded cylinders 21 After that, the adjusting bolt 25 is rotated. The adjusting bolt 25 rotates to drive the second moving magnetic core 27 to slide left and right along the thread on the driving rod 5, and the distance between the second moving magnetic core 27 and the second static magnetic core 26 is adjusted (at this time, the second static magnetic core 26 and the second moving magnetic core 27 are always kept at the farthest position at this time under the action of the third elastic member 30), so that the distance between the second static magnetic core 26 and the second moving magnetic core 27 adapts to the distance between the isolation station in the fixed shell 1 and the grounding contact 3 (grounding station). When the staff completes the adjustment, stop rotating the adjusting bolt 25 and screw in the locking bolt on the right side of the driving rod 5 to prevent the adjusting bolt 25 from loosening during use.

[0037] When the staff is ready to connect the circuit, the staff first activates the excitation coil 28 on the second static magnetic core 26 through the control terminal. The excitation coil 28 is energized to excite the second static magnetic core 26. The second static magnetic core 26 attracts the second moving magnetic core 27 to move to the left through magnetic force. The third elastic member 30 is compressed and stores force. During the movement, the second moving magnetic core 27 drives the driving rod 5 to move to the left together through the adjusting bolt 25. The driving rod 5 drives the sliding cylinder 6, the moving contact 8 and the connecting member 12 to move to the left together. The moving contact 8 is separated from the grounding contact 3. At this time, because the fourth through hole 91 is connected to the adjacent third through hole 73, the hydraulic oil on the left side of the third through hole 73 can flow to the right, but the hydraulic oil on the right side of the third through hole 73 cannot flow to the left. Therefore, the first elastic member 10 maintains the power storage state, and the sliding cylinder 6 pushes the insulating rod 7 and the sliding member 9 to move together through the hydraulic oil. The connecting member 12 slides along the right straight groove of the limiting cylinder 11 during the movement. When the connecting member 12 slides to the right oblique groove, the connecting member 12 slides along the right oblique groove. At this time, the connecting member 12 is Driven by the right inclined groove, the connecting member 12 drives the sliding member 9 to rotate together, and the fourth through hole 91 on the sliding member 9 gradually staggers with the adjacent third through hole 73 and rotates toward the adjacent second through hole 72. When the connecting member 12 slides to the contact point between the right inclined groove and the middle straight groove, the fourth through hole 91 is just aligned with and connected to the adjacent second through hole 72. At this time, the hydraulic oil on the left and right sides of the second through hole 72 can flow freely, so the first elastic member 10 shrinks and resets, and the insulating rod 7 and the sliding member 9 are in the first elastic member 1 0, when the elastic force in the first elastic member 10 is exhausted, the insulating rod 7 and the sliding member 9 stop moving, and then the sliding cylinder 6 pushes the insulating rod 7 and the sliding member 9 to move together through the first elastic member 10 during the movement, and the connecting member 12 moves along the middle straight groove until the second static magnetic core 26 fits with the second moving magnetic core 27. At this time, the driving rod 5 and the adjacent parts stop moving, the connecting member 12 is still located at the middle straight groove, and the moving contact 8 is located between the grounding contact 3 and the connecting contact 4, and is in the isolation position.

[0038] When the driving rod 5 stops moving, the staff activates the excitation coil 28 on the first static magnetic core 23 through the control terminal. The excitation coil 28 is energized to excite the first static magnetic core 23. The first static magnetic core 23 attracts the first moving magnetic core 24 to move to the left through magnetic force. The second elastic member 29 is compressed and stored. The first moving magnetic core 24 drives the sliding plate 22 and adjacent parts to move to the left together. The sliding plate 22 drives the driving rod 5 to move together through the second static magnetic core 26 and the second moving magnetic core 27 and other parts. The driving rod 5 drives the sliding cylinder 6, the insulating rod 7, the moving contact 8, the sliding member 9 and the connecting member 12 to move to the left together. After the connecting member 12 moves to the junction of the middle straight groove and the left oblique groove, it slides along the left oblique groove. The connecting member 12 drives the sliding member 9 to rotate together. When the connecting member 12 moves to contact with the left straight groove, the connecting member 12 slides along the left straight groove. In the process of the connecting member 12 driving the sliding member 9 to rotate, The same principle mentioned above drives the fourth through hole 91 to be staggered with the adjacent second through hole 72, and connects the fourth through hole 91 with the adjacent first through hole 71. At this time, the hydraulic oil on the left side of the first through hole 71 cannot flow to its right side, and the hydraulic oil on the right side of the first through hole 71 can flow freely to its left side. Subsequently, in the process of the sliding cylinder 6 driving the adjacent components to move to the left, the moving contact 8 first contacts with the connecting contact 4. At this time, the circular contact on the moving contact 8 is electrically connected to the connecting contact 4, and the circuit is connected. Subsequently, in the process of the sliding cylinder 6 driving the adjacent components to move to the left, the insulating rod 7, the moving contact 8 and the sliding member 9 cannot continue to move. During the movement, the sliding cylinder 6 squeezes the hydraulic oil on the right side of the sliding member 9 to flow to its left side, and the first elastic member 10 compresses and accumulates force until the first static magnetic core 23 contacts the first moving magnetic core 24. At this time, the sliding cylinder 6 and the adjacent components stop moving, the connecting member 12 is located in the left straight groove, and the moving contact 8 is located on the connecting station.

[0039] When the circuit is connected, the control terminal periodically magnetizes the two excitation coils 28 to eliminate the possibility of magnetic attenuation of the excitation coils 28. Because the first static magnetic core 23 and the first moving magnetic core 24 are wrapped in the first magnetic shielding cover 31 and the second magnetic shielding cover 32, and the second static magnetic core 26 and the second moving magnetic core 27 are wrapped in the third magnetic shielding cover 33, it is ensured that the first static magnetic core 23 and adjacent components and the second static magnetic core 26 and adjacent components will not generate magnetic interference with each other, and at the same time shield the stray magnetic field in the environment, ensuring that the excitation coil 28 in the device will not fail due to environmental changes.

[0040] When the staff needs to disconnect the circuit, they only need to demagnetize the two excitation coils 28 in turn according to the reverse order of the above excitation sequence. When the excitation coil 28 is demagnetized, the first static magnetic core 23 and the second static magnetic core 26 will lose their magnetism. At this time, the elastic force in the second elastic member 29 and the third elastic member 30 is released, thereby controlling the drive rod 5 and adjacent components to operate in reverse according to the above principle, switching the position of the moving contact 8, and then controlling the connectivity of the entire circuit. Because after the excitation coil 28 is demagnetized, the second elastic member 29 and the third elastic member 30 do not need to overcome the magnetic force during the elastic force release process, and only need to release the energy stored in the spring. When the second elastic member 29 and the third elastic member 30 use springs with smaller elastic force, the elastic force release speed of the second elastic member 29 and the third elastic member 30 will not be affected, which is sufficient to quickly disconnect the circuit and reduce the power consumption of the excitation coil 28 during excitation in disguise.

[0041] Under the action of the one-way valve on the first through hole 71, when the moving contact 8 moves from the isolation position to the connection position, the moving contact 8 first contacts the connection contact 4, and then the insulating rod 7 and the sliding cylinder 6 slide relative to each other, thereby reducing the error when the staff adjusts the stroke of the driving rod 5 and reducing the difficulty of installing the device. When the moving contact 8 moves from the connection position to the isolation position, the sliding cylinder 6 first drives the insulating rod 7 to move (the moving contact 8 first moves away from the connection contact 4), and then the sliding cylinder 6 slides relative to the insulating rod 7, thereby ensuring that the moving contact 8 moves quickly when disconnecting, thereby avoiding the moving contact 8 from moving too slowly, resulting in excessive arcing between the moving contact 8 and the connection contact 4, and causing damage to the moving contact 8.

[0042] Embodiment 2: Because when designing the stroke and position of the contacts of a direct-acting three-position isolating and grounding switch, it is usually necessary to keep the moving contact moving along a horizontal straight line and cooperate with adjacent components at the beginning and end positions of the moving stroke (that is, the axes of the three contacts are on the same line). However, during the production and assembly process of the direct-acting three-position isolating and grounding switch, there are usually installation errors, that is, the axes of the three contacts are not on the same straight line. At this time, there will be greater wear at the fitting points of the three contacts, resulting in a reduction in the service life of the existing direct-acting three-position isolating and grounding switch.

[0043] Based on Example 1, the present invention aims at the above-mentioned problem, referring to Figure 10-12As shown, it also includes a guide mechanism arranged in the fixed shell 1, the guide mechanism is used to guide the moving contact 8, the guide mechanism includes a sliding shell 40 slidably connected to the outside of the moving contact 8, a ball is installed in the sliding shell 40, the sliding shell 40 is slidably connected to the moving contact 8 through the ball inside it, and is used to reduce the friction between the sliding shell 40 and the moving contact 8, the insulating rod 7 is a flexible rod, which is convenient for the moving contact 8 to slide along the sliding shell 40, the left side of the fixed shell 1 is fixedly connected to two fixed rings 41 symmetrically distributed on the left and right, the opposite sides of the two fixed rings 41 are slidably connected to the extrusion rings 42, the sliding shell 40 is fixedly connected to the sliding block 43 symmetrically distributed, and the sliding block 43 is slidably matched and extruded with the two extrusion rings 42. A ball is slidably connected to the extrusion ring 42. The extrusion ring 42 is slidably connected to the adjacent sliding block 43 through the ball. When sliding occurs between the extrusion ring 42 and the adjacent sliding block 43, the wear between the extrusion ring 42 and the adjacent sliding block 43 is reduced. There is damping between the sliding block 43 and the adjacent ball, which makes it easy for the extrusion ring 42 to limit the sliding block 43. When no external force is applied, the relative positions of the sliding block 43, the sliding shell 40 and the two extrusion rings 42 are maintained. A fourth elastic member 44 is installed between the fixed ring 41 and the adjacent extrusion ring 42, and the fourth elastic member 44 is a spring.

[0044] When the control terminal controls the moving contact 8 to change its position, the moving contact 8 slides left and right along the sliding shell 40 under the action of the adjacent balls, ensuring that the moving contact 8 maintains a horizontal path, and the balls fully reduce the friction between the moving contact 8 and the sliding shell 40. If the grounding contact 3 and the connecting contact 4 are completely in the designed position during assembly, the moving contact 8 always moves in a straight line. At this time, the two sliding blocks 43 on the sliding shell 40 remain stationary under the pressure of the adjacent extrusion rings 42 and the balls. If there is an error in the position of the grounding contact 3 and the connecting contact 4 during assembly, the moving contact 8 does not move along the sliding shell 40 during movement. It moves in a straight line. Assuming that the installation position of the connecting contact 4 is higher than the designed position, when the moving contact 8 contacts the connecting contact 4, its upper inclined surface is squeezed by the connecting contact 4, causing the moving contact 8 to gradually move upward, and the moving contact 8 drives the sliding shell 40 and the two sliding blocks 43 to move upward together. At this time, because the insulating rod 7 is a flexible rod, and the sliding block 43 is connected to the adjacent extrusion ring 42 by a ball bearing, the resistance to the upward movement of the moving contact 8 is small. Therefore, the extrusion force between the moving contact 8 and the connecting contact 4 is small, thereby reducing the wear between the moving contact 8 and the connecting contact 4, and reducing the influence of the installation error on the device.

[0045] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-position isolating grounding switch with a flexible magnetic control mechanism, characterized in that: The invention comprises a fixed shell (1), wherein the fixed shell (1) is fixedly connected to a fixed plate (2) via a support rod, the fixed plate (2) is fixedly connected to a grounding contact (3) and a connecting contact (4), the fixed plate (2) is slidably connected to a driving rod (5), a side of the driving rod (5) close to the fixed shell (1) is fixedly connected to a sliding cylinder (6), a side of the sliding cylinder (6) away from the fixed plate (2) is slidably connected to an insulating rod (7), the insulating rod (7) is fixedly connected to a moving contact (8), the grounding contact ( 3) and the connecting contact (4) are both in contact with the moving contact (8), the insulating rod (7) is rotatably connected to a sliding member (9), the sliding member (9) is slidably connected to the driving rod (5), the sliding cylinder (6) is slidably connected to the sliding member (9), a first elastic member (10) is installed between the sliding cylinder (6) and the sliding member (9), and a flexible magnetic control mechanism for driving the driving rod (5) to slide is provided on a side of the fixed plate (2) away from the fixed shell (1); The insulating rod (7) is located in the sliding cylinder (6) and is provided with three groups of through holes distributed circumferentially, each group includes symmetrically distributed through holes, the three groups of through holes on the insulating rod (7) are respectively a first through hole (71), a second through hole (72) and a third through hole (73), the sliding member (9) is provided with a symmetrically distributed fourth through hole (91), the first through hole (71), the second through hole (72) and the third through hole (73) are all communicated with and matched with the adjacent fourth through hole (91), and the first through hole (71) and the third through hole (73) are provided with a one-way valve; A limiting cylinder (11) is fixedly connected to one side of the fixed shell (1) close to the sliding cylinder (6), the limiting cylinder (11) is in contact with and cooperates with the sliding cylinder (6), a connecting piece (12) is connected to the driving rod (5) for limiting rotation, the connecting piece (12) is spline-connected to the sliding piece (9), and symmetrically distributed sliding grooves are provided on the limiting cylinder (11), and the sliding grooves on the limiting cylinder (11) are in limiting cooperation with the connecting piece (12).

2. A three-position isolating grounding switch with a flexible magnetic control mechanism according to claim 1, characterized in that: The flexible magnetic control mechanism comprises a circumferentially uniformly distributed fixed rod (20), the fixed rod (20) being fixedly connected to the fixed plate (2), the fixed rod (20) being threadedly connected to a threaded cylinder (21), the circumferentially uniformly distributed threaded cylinder (21) being jointly limitedly slidably connected to a sliding plate (22), a first static magnetic core (23) being fixedly connected to a side of the fixed plate (2) close to the sliding plate (22), a first moving magnetic core (24) being fixedly connected to a side of the sliding plate (22) close to the fixed plate (2), the first static magnetic core (23) and the first moving magnetic core (24) being magnetically matched, a side of the driving rod (5) close to the sliding plate (22) being threadedly connected to an adjusting bolt (25), the sliding plate (22) being far away from the sliding plate (22) and the first moving magnetic core (24) being magnetically matched, A second static magnetic core (26) is fixedly connected to one side of the fixed plate (2); the adjusting bolt (25) is rotatably connected to a second moving magnetic core (27); the driving rod (5) penetrates the sliding plate (22), the first static magnetic core (23), the first moving magnetic core (24) and the second static magnetic core (26); the second static magnetic core (26) and the second moving magnetic core (27) are magnetically matched; an excitation coil (28) is installed in each of the first static magnetic core (23) and the second static magnetic core (26); a second elastic member (29) is installed between the first static magnetic core (23) and the first moving magnetic core (24); and a third elastic member (30) is installed between the second static magnetic core (26) and the second moving magnetic core (27).

3. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 2, characterized in that: The first static magnetic core (23) and the second static magnetic core (26) are made of flexible magnetic control materials, have a low demagnetization rate, and are easy to be excited and demagnetized by the excitation coil (28).

4. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 2, characterized in that: The elastic force of the second elastic member (29) is greater than the elastic force of the third elastic member (30), and the initial states of the second elastic member (29) and the third elastic member (30) are both in a compressed state.

5. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 3, characterized in that: The fixed plate (2) is fixedly connected to a first magnetic shielding cover (31), the sliding plate (22) is fixedly connected to a second magnetic shielding cover (32) and a third magnetic shielding cover (33), the first static magnetic core (23) and the first moving magnetic core (24) are located between the first magnetic shielding cover (31) and the second magnetic shielding cover (32), the first magnetic shielding cover (31) and the second magnetic shielding cover (32) are slidably connected, and the second static magnetic core (26) and the second moving magnetic core (27) are located inside the third magnetic shielding cover (33).

6. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 5, characterized in that: The first magnetic shielding cover (31) and the second magnetic shielding cover (32) are combined into an eggshell shape, and the third magnetic shielding cover (33) is also in an eggshell shape.

7. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 1, characterized in that: The housing (1) further comprises a guide mechanism for guiding the moving contact (8), the guide mechanism being arranged in the fixed housing (1), the guide mechanism comprising a sliding housing (40), the sliding housing (40) being slidably connected to the outer side of the moving contact (8), a symmetrically distributed fixing ring (41) being fixedly connected to a side of the fixed housing (1) close to the sliding housing (40), the fixing ring (41) being slidably connected to an extrusion ring (42), the sliding housing (40) being fixedly connected to symmetrically distributed sliding blocks (43), the sliding blocks (43) being slidably matched and extrusion matched with the symmetrically distributed extrusion rings (42), and a fourth elastic member (44) being installed between the fixing ring (41) and the adjacent extrusion ring (42).

8. A three-position isolating and grounding switch with a flexible magnetic control mechanism according to claim 7, characterized in that: A ball is installed in the sliding shell (40), and the sliding shell (40) is slidably connected to the moving contact (8) via the ball inside the sliding shell (40), and a ball is slidably connected to the extrusion ring (42), and the extrusion ring (42) is slidably connected to an adjacent sliding block (43) via the ball on the extrusion ring (42), and damping exists between the sliding block (43) and the adjacent ball.

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