Isolating switch with opening and closing position interlocking control mechanism

Abstract

The invention discloses an isolating switch with an opening and closing position interlocking control mechanism, which relates to the technical field of electrical equipment, and comprises a base, two insulators arranged on the base, wiring boards arranged at the end parts of the insulators, and a knife switch used for connecting the two wiring boards, the switch blade is provided with an operating mechanism and a contact point arranged at the end of the switch blade, two clamping grooves are formed in the inner wall of the rotating hole of the wiring board on the side, and the other end of the switch blade makes contact with the other wiring board through the contact point to achieve the opening and closing effect. The interlocking mechanism is arranged on one side of the knife switch and is used for controlling the knife switch so that the knife switch can be operated only when the circuit breaker is in a power-off state; and the contact cleaning mechanism is arranged on the side of the contact and is used for covering the contact to reduce oxidation and cleaning the surface of the contact at the same time when the knife switch is switched on.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to a disconnecting switch with an interlocking control mechanism for opening and closing positions. Background Technology

[0002] High-voltage disconnect switches are important switching devices in the electrical systems of power plants and substations, and must be used in conjunction with high-voltage circuit breakers. Disconnect switches are suitable for indoor installations of three-phase AC 50Hz with a rated voltage of 12kV. They are used to connect, disconnect, or switch lines when high-voltage equipment is under parallel load.

[0003] Its main functions are to ensure the safety of high-voltage electrical appliances and equipment during maintenance and to isolate voltage. It cannot be used to cut off or connect load current or interrupt short-circuit current. It can only be used for certain switching operations that do not generate a strong electric arc. In other words, it does not have an arc-extinguishing function. Since the contacts of the high-voltage disconnector are all exposed to the air and have a clear disconnection point, and since the disconnector does not have an arc-extinguishing device, it cannot be used to cut off load current or short-circuit current. Otherwise, under the action of high voltage, a strong electric arc will be generated at the disconnection point, which is difficult to extinguish on its own and may even cause a flying arc (phase-to-ground or phase-to-phase short circuit), burn out equipment, and endanger personal safety. This is the so-called serious accident of "pulling the disconnector under load".

[0004] Therefore, existing disconnect switches often have an additional opening and closing interlocking control mechanism to prevent equipment damage caused by load opening and closing due to their lack of arc extinguishing function. For this reason, it is necessary to set up a disconnect switch with an opening and closing interlocking control mechanism to prevent equipment burnout caused by working under load. Summary of the Invention

[0005] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. The present invention provides a disconnecting switch with an interlocking control mechanism for opening and closing positions. This solves the problem that existing disconnecting switches lack arc-extinguishing devices, and therefore require an additional interlocking control mechanism to prevent arcing during opening and closing.

[0006] The present invention adopts the following technical solution: a disconnecting switch with an interlocking control mechanism for opening and closing positions, comprising a base, two insulators disposed on the base, a terminal block disposed at the end of the insulators, and further comprising:

[0007] The switch is used to connect two terminal blocks. The switch is equipped with an operating mechanism and a contact point at the end of the switch. Two engaging grooves are formed in the inner wall of the rotating hole of the terminal block on this side. The other end of the switch contacts another terminal block through the contact point to achieve the opening and closing effect.

[0008] An interlocking mechanism is provided on one side of the switch to control the circuit breaker so that it can only be operated when the circuit breaker is de-energized;

[0009] A contact cleaning mechanism is provided on the side of the contact. It is used to cover the contact to reduce oxidation and clean its surface during the opening phase of the switch.

[0010] Furthermore, the operating mechanism includes a fixed block and a deflection block. The fixed block is connected to the knife gate by a fastener, and the deflection block is connected to the fixed block by a rotating shaft. An additional connecting spring is provided between the deflection block and the fixed block for resetting. The end of the deflection block is provided with a hook-shaped structure, and the terminal block used in conjunction with it has grooves.

[0011] Furthermore, the interlocking mechanism includes an interlocking component and a locking control component. The interlocking component includes a telescopic connecting arm and a deflection motor. The telescopic connecting arm and the deflection motor are connected. The end of the telescopic connecting arm is connected to the driven friction rod via a rotating shaft. The driven friction rod is connected to the electrically controlled telescopic rod via a sliding block. A rotating plate is provided on the corresponding end of the switch. The rotating plate deflects synchronously with the switch. A locking control component is provided above the driven friction rod.

[0012] Furthermore, one end of the breaker is connected to one of the terminal blocks via a locking control assembly, enabling it to rotate. The locking control assembly has a rotating shaft and two threaded discs slidably connected to the breaker. Each threaded disc has an engaging block on its inner side, which engages with an engaging groove. The two threaded discs are connected by a bidirectional screw, which is located inside the rotating shaft. The threaded discs and the rotating shaft are slidably connected through each other. The end of the bidirectional screw is connected to a torsion spring friction sleeve, which contacts a driven friction block. A transmission belt is provided on the torsion spring friction sleeve, and the transmission belt and the driven friction block are staggered with respect to the torsion spring friction sleeve.

[0013] Furthermore, the threads on the bidirectional screw are divided into two opposite parts, which can cause the two threaded discs to move relative to each other when the screw rotates.

[0014] Furthermore, the contact cleaning mechanism includes a connecting plate and a driven friction wheel that are connected to the sliding guide block at the other end of the switch. A contact plate is provided below the connecting plate. The driven friction wheel is rotatably connected to the switch. The driven friction wheel and the torsion spring friction sleeve are connected by a transmission belt. The driven friction wheel and the connecting plate are connected by a friction plate.

[0015] Furthermore, the outer surfaces of the driven friction wheel, friction plate, driven friction rod, and torsion spring friction sleeve are all made of high-friction and wear-resistant material.

[0016] Furthermore, the drive motor and the control switch for the electrically controlled telescopic rod are electrically connected to the circuit breaker.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] Firstly, by setting up an additional interlocking control mechanism for opening and closing that works in conjunction with the circuit breaker, the disconnecting switch can only be operated when the circuit breaker is in the open state. Moreover, the operation of this interlocking control mechanism is simple: when the disconnecting switch is closed, the disconnecting switch must be closed before the circuit breaker can be closed; when the circuit breaker is opened, the circuit breaker must be opened first. When the disconnecting switch needs to be operated, the circuit breaker is always in the open state.

[0019] Secondly, by setting up a contact point cleaning mechanism that works in conjunction with the opening and closing interlocking mechanism, this cleaning mechanism can clean the surface oxides during the closing movement, preventing the presence of oxides from causing a decrease in the contact effect of the contact points and indirectly leading to an increase in contact resistance (when the contact resistance increases, the contact point temperature will also rise, accelerating oxidation and ablation).

[0020] Thirdly, during the opening process, the interlocking mechanism automatically locks the switch when the opening angle reaches a certain range, preventing the switch from accidentally falling off after the traction mechanism is removed, thus preventing accidental closing. This improves the safety of the switch during opening, ensuring it remains within a safe range.

[0021] In summary, by setting up an interlocking control mechanism, the disconnecting switch can be guaranteed to be free from arcing during use. Furthermore, through this interlocking control mechanism, when the switch is opened to a certain range... Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a first-view structural diagram of the main body of the present invention;

[0024] Figure 2 This is a schematic diagram of the main body structure from a second perspective of the present invention;

[0025] Figure 3 This is a schematic diagram of the first-view structure of the guillotine switch of the present invention;

[0026] Figure 4 This is a schematic diagram of the second-view structure of the guillotine switch of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0028] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point B;

[0029] Figure 7 This is a second-view structural schematic diagram of the contact cleaning mechanism of the present invention;

[0030] Figure 8 This is an exploded view of the locking control component and wiring board of the present invention;

[0031] Figure 9 This is a schematic diagram of the locking control component and rotating shaft structure of the present invention.

[0032] Figure label:

[0033] 1. Base; 2. Insulator; 3. Terminal block; 31. Engaging groove; 5. Knife switch; 51. Sliding guide block; 52. Contact point; 6. Operating mechanism; 61. Deflection block; 62. Fixing block;

[0034] 4. Interlocking mechanism; 41. Telescopic connecting arm; 42. Deflection motor; 43. Driven friction rod; 44. Electrically controlled telescopic rod; 45. Transmission belt; 46. Locking control assembly; 461. Bidirectional screw; 462. Threaded disc; 463. Engaging block; 464. Torsion spring friction sleeve; 47. Spring contact rod; 48. Rotating plate;

[0035] 7. Contact cleaning mechanism; 71. Driven friction wheel; 72. Friction plate; 73. Connecting plate; 74. Contact plate. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0038] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The following is combined Figures 1 to 9 As shown, this embodiment of the invention provides a disconnecting switch with an interlocking control mechanism for opening and closing positions, including a base 1, two insulators 2 disposed on the base 1, a terminal block 3 disposed at the end of the insulators 2, and further comprising;

[0042] The switch 5 is used to connect two terminal blocks 3. The switch 5 is provided with an operating mechanism 6 and a contact point 52 at the end of the switch 5. Two engaging grooves 31 are opened in the inner wall of the rotating hole of the terminal block 3 on this side. The other end of the switch 5 contacts another terminal block 3 through the contact point 52 to achieve the opening and closing effect.

[0043] Interlocking mechanism 4, which is located on one side of the switch 5, is used to control the switch so that it can only be operated when the circuit breaker is de-energized;

[0044] The contact cleaning mechanism 7 is located beside the contact and is used to cover the contact to reduce oxidation and clean its surface when the switch 5 is open.

[0045] Specifically, the operating mechanism 6 includes a fixed locking block 62 and a deflection locking block 61. The fixed locking block 62 is connected to the knife gate 5 by fasteners. The deflection locking block 61 is connected to the fixed locking block 62 by a rotating shaft. An additional connecting spring is provided between the deflection locking block 61 and the fixed locking block 62 for resetting. The end of the deflection locking block 61 is provided with a hook-shaped structure. The terminal block 3 used in conjunction with it has grooves.

[0046] Specifically, the interlocking mechanism 4 includes an interlocking component and a locking control component 46. The interlocking component includes a telescopic connecting arm 41 and a deflection motor 42. The telescopic connecting arm 41 and the deflection motor 42 are connected. The end of the telescopic connecting arm 41 is connected to the driven friction rod 43 through a rotating shaft. The driven friction rod 43 is connected to the electrically controlled telescopic rod 44 through a sliding block. A rotating plate 48 is provided on the corresponding end of the switch 5. The rotating plate 48 deflects synchronously with the switch 5. The locking control component 46 is provided above the driven friction rod 43.

[0047] Specifically, one end of the switch 5 is connected to one of the terminal blocks 3 via a locking control assembly 46, enabling it to rotate. The locking control assembly 46 has a rotating shaft and two threaded discs 462 that are slidably connected to the switch 5. Each threaded disc 462 has an engaging block 463 on its inner side, which engages with an engaging groove 31. The two threaded discs 462 are connected by a bidirectional screw 461 located inside the rotating shaft. The threaded discs 462 are slidably connected to the rotating shaft. The end of the bidirectional screw 461 is connected to a torsion spring friction sleeve 464, which contacts a driven friction rod 43. A transmission belt 45 is provided on the torsion spring friction sleeve 464, and the transmission belt 45 and the driven friction rod 43 are staggered with the torsion spring friction sleeve 464. The distance between the two engaging grooves 31 determines the opening angle of the switch 5. When the distance changes, the position of the spring abutment rod 47 must be adjusted accordingly to ensure proper contact.

[0048] Specifically, the threads on the bidirectional screw 461 are divided into two opposing parts, which allow the two threaded discs 462 to move relative to each other when the screw rotates. That is, when the bidirectional screw 461 rotates in one direction, the two bidirectional threaded discs 462 will move outward or inward simultaneously. The limiting effect of the two threaded discs 462 is better at this time, avoiding the deviation and tilting of the gate 5 caused by prolonged unilateral limiting.

[0049] Specifically, the contact cleaning mechanism 7 includes a connecting plate 73 and a driven friction wheel 71, which are connected to the sliding guide block 51 at the other end of the switch 5. A contact plate 74 is provided below the connecting plate 73. The driven friction wheel 71 is rotatably connected to the switch 5. The driven friction wheel 71 and the torsion spring friction sleeve 464 are connected by a transmission belt 45. The driven friction wheel 71 and the connecting plate 73 are connected by a friction plate 72.

[0050] Specifically, the outer surfaces of the driven friction wheel 71, friction plate 72, driven friction rod 43, and torsion spring friction sleeve 464 are all made of high-friction, wear-resistant material. This increases the service life by improving the coefficient of friction and wear resistance of the friction material.

[0051] Specifically, the drive motor and the control switch of the electrically controlled telescopic rod 44 are electrically connected to the circuit breaker.

[0052] It should be noted that the drive motor can only operate when the exerciser is powered off.

[0053] Working principle: During use, when the circuit breaker trips, the deflection motor 42 and the electrically controlled telescopic rod 44 are powered. The deflection motor 42 rotates, driving the telescopic connecting arm 41 to deflect (note that the rotation angle of the deflection motor 42 is not 360°; its rotation mainly pushes the driven friction rod 43 to one side). After the telescopic connecting arm 41 deflects, it drives the driven friction rod 43 to move. Since the driven friction rod 43 is laterally restricted by the electrically controlled telescopic rod 44, the movement of the driven friction rod 43 drives the torsion spring friction sleeve 464 to rotate. In the initial stage, the bidirectional screw 461... It will rotate with it. At this time, the threaded disc 462 will move outward due to the thread action of the bidirectional screw 461 (because the threaded disc 462 is slidably connected to the side wall of the gate 5, it will not rotate with it, but will only move horizontally, and the depth of the groove is limited at the same time). When the threaded disc 462 moves to a certain extent, it can no longer move. That is, at this time the locking block 463 has disengaged from the first locking groove 31. However, at this time the driven friction rod 43 and the torsion spring friction sleeve 464 are still in contact. Therefore, the torsion spring friction sleeve 464 will continue to rotate, and the internal torsion spring will store force. When the deflection motor 42 rotates to the limit angle, it will stop rotating.

[0054] At this point, the deflection block 61 and the fixed block 62 are inserted into the groove formed by the traction mechanism (note that the traction mechanism here can be manually pulled or other upward pulling methods). The upward pull of the traction mechanism causes the deflection block 61 to rotate. As the deflection block 61 rotates, its hook-like structure moves off the terminal block 3. As the traction mechanism continues to pull upward, the switch 5 gradually deflects, and the rotating plate 48 follows suit. As the switch 5 continues to deflect, when it reaches a certain angle, the setting... The spring abutment rod 47 on the rotating plate 48 will abut against the driven friction rod 43, pressing the driven friction rod 43 down. At this time, the driven friction rod 43 releases the restriction on the torsion spring friction sleeve 464. The torsion spring friction sleeve 464 reverses under the action of the internal torsion spring, thereby driving the threaded disc 462 to move inward (at this time, the locking block 463 on the thread corresponds to the second locking groove 31). The locking block 463 on the threaded disc 462 that moves inward engages in the locking groove 31, thereby completing the locking of the switch 5 and enabling it to remain in the open state.

[0055] Secondly, when the torsion spring friction sleeve 464 rotates forward, it will drive the driven friction wheel 71 to rotate through the transmission belt 45. Since the initial position of the contact plate 74 cannot move further inward, the driven friction wheel 71 and the friction plate 72 will slip at this time. That is, the contact plate 74 will not move when rotating forward. When the torsion spring friction sleeve 464 rotates in reverse under the action of the torsion spring, the contact plate 74 will eventually move outward. During the movement, it will come into contact with the surface of the contact point 52 to produce a polishing effect. At the same time, it can cover the contact point 52 to prevent the contact point 52 from directly contacting the air, which would lead to accelerated oxidation.

[0056] When a reset is required, the electrically controlled telescopic rod 44 is activated (the fixed end of the electrically controlled telescopic rod 44 is connected to the mounting base via a spring column, allowing it to be pushed downward by the spring-loaded contact rod 47), resetting its height and bringing the driven friction rod 43 into contact with the torsion spring friction sleeve 464. At this time, the deflection motor 42 is activated to continue rotating forward. Through the rotation of the torsion spring sleeve, the contact plate 74 retracts. During the forward rotation, the threaded disc 462 releases its rotation limit. Then, the switch 5 is continuously lowered until it reaches the appropriate position. At this time, the electrically controlled telescopic rod 44 descends, releasing the contact between the driven friction rod 43 and the torsion spring friction sleeve 464. Similarly, the internal torsion spring completes the reset and lock. Then, the deflection motor 42 and the electrically controlled telescopic rod 44 are reset, the circuit breaker is closed, and the deflection motor 42 and the electrically controlled telescopic rod 44 are de-energized.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A disconnector with interlocking control mechanism of opening and closing position, comprising a base (1), two insulators (2) arranged on the base (1), and a terminal plate (3) arranged at the end of the insulator (2), characterized in that: Also includes: A switch (5) is used to connect two terminal blocks (3). The switch (5) is equipped with an operating mechanism (6) and a contact point (52) at the end of the switch (5). The inner wall of the rotating hole of the terminal block (3) on this side has two engaging grooves (31). The other end of the switch (5) contacts the other terminal block (3) through the contact point (52) to achieve the opening and closing effect. The two engaging grooves (31) Interlocking mechanism (4), which is located on one side of the switch (5), is used to control the switch (5) so that it can only be operated when the circuit breaker is de-energized; Contact cleaning mechanism (7) is located on the side of the contact and is used to cover the contact to reduce oxidation and clean its surface when the switch (5) is open.

2. The disconnector with the interlocked control mechanism of the opening and closing positions according to claim 1, characterized in that: The operating mechanism (6) includes a fixed block (62) and a deflection block (61). The fixed block (62) is connected to the switch (5) by fasteners. The deflection block (61) is connected to the fixed block (62) by a rotating shaft. An additional connecting spring is provided between the deflection block (61) and the fixed block (62) for resetting. The end of the deflection block (61) is provided with a hook-shaped structure. The terminal block (3) used in conjunction with it has a groove.

3. The disconnector with the interlocked control mechanism of the opening and closing positions according to claim 1, characterized in that: The interlocking mechanism (4) includes an interlocking component, a locking control component (46), and a spring abutment rod (47). The interlocking component includes a telescopic connecting arm (41) and a deflection motor (42). The telescopic connecting arm (41) and the deflection motor (42) are connected. The end of the telescopic connecting arm (41) is connected to the driven friction rod (43) through a rotating shaft. The driven friction rod (43) is connected to the electrically controlled telescopic rod (44) through a sliding block. A rotating plate (48) is provided on the corresponding end of the switch (5). The rotating plate (48) deflects synchronously with the switch (5). A locking control component (46) is provided above the driven friction rod (43). The spring abutment rod (47) is provided on the rotating plate (48).

4. The disconnector with the interlocked control mechanism of the opening and closing positions according to claim 3, characterized in that: One end of the guillotine (5) is connected to one of the terminal blocks (3) via a locking control assembly (46) to enable it to rotate. The locking control assembly (46) has a rotating shaft and two threaded discs (462) that are slidably connected to the guillotine (5). Each threaded disc (462) has a locking block (463) on its inner side. The locking block (463) works in conjunction with the locking groove (31). The two threaded discs (462) are connected by a bidirectional screw (461). The bidirectional screw (461) is located inside the rotating shaft. The threaded discs (462) are slidably connected to the rotating shaft. The end of the bidirectional screw (461) is connected to a torsion spring friction sleeve (464). The torsion spring friction sleeve (464) contacts the driven friction rod (43), and a transmission belt (45) is provided on the torsion spring friction sleeve (464). The transmission belt (45) and the driven friction rod (43) are staggered with the torsion spring friction sleeve (464).

5. The disconnector having the opening and closing position interlocking control mechanism according to claim 4, characterized in that: The two-way screw (461) is threaded into two opposite parts, and the two threaded discs (462) can move relative to each other when the screw rotates.

6. The disconnector having the opening and closing position interlocking control mechanism according to claim 1, characterized in that: The contact cleaning mechanism (7) comprises a connecting plate (73) connected with the sliding guide block (51) at the other end of the blade (5) and a driven friction wheel (71), the lower end of the connecting plate (73) is provided with a contact plate (74), the driven friction wheel (71) is rotationally connected with the blade (5), the driven friction wheel (71) and the torsional spring friction sleeve (464) are connected through a transmission belt (45), and the driven friction wheel (71) and the connecting plate (73) are connected through a friction plate (72).

7. The disconnector having the opening and closing position interlocking control mechanism according to claim 6, characterized in that: The outer surfaces of the driven friction wheel (71), the friction plate (72), the driven friction rod (43) and the torsional spring friction sleeve (464) are made of high-friction wear-resistant materials.

8. The disconnector having the opening and closing position interlocking control mechanism according to claim 3, characterized in that: The control switch and the circuit breaker of the electric control telescopic rod (44) and the driving motor are electrically connected.

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