A capacitor composite switching switch and a capacitor compensation unit

Abstract

This application relates to an electrical switch device, in particular to a capacitor composite switching switch and a capacitor compensation unit. The key technical points of its technical solution are that it is arranged in an oil tank, and the oil tank is connected with an oil inlet pipe; it includes a mounting base plate arranged in the oil tank, an oil switch, a vacuum switch and a moving-end impactor arranged on the mounting base plate; the oil switch and the vacuum switch are connected in series; when the composite switching switch is closed, the moving-end impactor causes the oil switch to be closed first, and then causes the vacuum switch to be closed within a preset time; when the composite switching switch is opened, the moving-end impactor causes the vacuum switch to be opened first, and then causes the oil switch to be opened within a preset time; the function of such a design is that when the composite switching switch is opened, the vacuum switch is opened first, and then the oil switch is caused to be opened after a preset time interval. Since the circuit has been disconnected by the vacuum switch at this time, no arc will be generated in the oil switch at this time, achieving the purpose of maintenance-free.

Description

Technical Field

[0001] This application relates to an electrical switch device, in particular to a capacitor composite switching switch and a capacitor compensation unit. Background Art

[0002] Currently, vacuum contactors and vacuum circuit breakers are mostly used for switching capacitors in 10 kV systems. However, both types of vacuum switches are prone to contact re-ignition within a specific time after disconnection. Contact re-ignition will generate overvoltage, which will cause serious harm to electrical equipment, reduce the service life of capacitors, and even pose a risk of explosion.

[0003] During the process of using an oil switch to switch a capacitor bank, there will be no phenomenon of re-ignition. However, the arc generated when cutting off the capacitor will carbonize the insulating oil. Therefore, the oil switch needs to be maintained regularly, and the maintenance cost is relatively high. Therefore, the oil switch is gradually not suitable for most maintenance-free occasions. Summary of the Invention

[0004] In order to make the switching switch neither generate re-ignition nor generate an arc, this application provides a capacitor composite switching switch and a capacitor compensation unit.

[0005] The capacitor composite switching switch provided by this application adopts the following technical solution:

[0006] A capacitor composite switching switch is arranged in an oil tank, and the oil tank is connected with an oil inlet pipe; it includes a mounting base plate arranged in the oil tank, an oil switch, a vacuum switch and a moving-end impactor arranged on the mounting base plate; the oil switch and the vacuum switch are connected in series;

[0007] When the composite switching switch is closed, the moving-end impactor makes the oil switch close first, and then makes the vacuum switch close within a preset time;

[0008] When the composite switching switch is opened, the moving-end impactor makes the vacuum switch open first, and then makes the oil switch open within a preset time.

[0009] By adopting the above technical solution, before the composite switching switch closes and opens, the operator fills a certain amount of insulating oil into the fuel tank through the inlet pipe, so that the oil switch and the vacuum switch can be immersed in the insulating oil; when the composite switching switch closes, the moving end impactor makes the oil switch close first, and then makes the vacuum switch close within a preset time; when the composite switching switch opens, the moving end impactor makes the vacuum switch open first, and then makes the oil switch open within a preset time; the function of such a design is that when the composite switching switch opens, the vacuum switch opens first, and at this time the arc extinguishing of the vacuum switch is completed in the vacuum tube, and then after a preset time interval, the oil switch is made to open. Since the circuit has been disconnected by the vacuum switch at this time, the oil switch will not generate an arc at this time, thus avoiding the possibility of the insulating oil being carbonized due to the high-temperature arc, and further achieving the purpose of maintenance-free; at the same time, since the disconnection of the first switch generates an isolation port, and the vacuum switch and the oil switch are in series, one end of the vacuum tube will be suspended, and the recovery voltage across the two ends of the vacuum tube is not enough to cause the vacuum switch to reignite, thus achieving the purpose that the switching switch does not generate reignition.

[0010] Preferably, the oil switch includes a first static contact arranged on the mounting base plate, a second static contact arranged on one side of the first static contact, and a first moving contact slidably connected to the mounting base plate along the extension line of the first static contact and the second static contact. The first moving contact is slidably connected to both the first static contact and the second static contact, and the first moving contact is fixedly connected to the moving end impactor; the vacuum switch includes a vacuum tube arranged on one side of the second static contact, a third static contact arranged in the vacuum tube, and a second moving contact arranged on the side of the third static contact close to the first moving contact; the first static contact is connected to the wiring terminal, the second static contact is connected to the second moving contact, and the third static contact is connected to another wiring terminal; the moving end impactor is connected to the first moving contact, and the connection line between the moving end impactor and the second moving contact is parallel to the sliding direction of the first moving contact; the time taken for the first moving contact to connect to both the first static contact and the second static contact is less than the time taken for the second moving contact to connect to the third static contact.

[0011] By adopting the above technical solution, when the composite switching switch opens, first the moving end impactor will separate from the second moving contact, so that the vacuum switch opens; at the same time, since the time taken for the first moving contact to connect to both the first static contact and the second static contact is less than the time taken for the second moving contact to connect to the third static contact, after a period of time, the first moving contact will separate from the second static contact, so that the oil switch opens; such a design realizes the interval opening of the oil switch and the vacuum switch, thus avoiding the possibility of the oil switch generating an arc and the vacuum switch reigniting, and achieving the purpose of maintenance-free and no reignition.

[0012] Preferably, it further includes a fixed frame disposed on one side of the vacuum tube close to the moving end impactor; the second moving contact includes a moving end conductive rod extending into the fixed frame; the vacuum switch further includes a first connecting rod disposed at one end of the moving end conductive rod away from the third static contact and connected to the moving end conductive rod, a contact piece disposed at one end of the first connecting rod away from the moving end conductive rod and outside the fixed frame, a first conductive piece disposed in the fixed frame and fixedly connected to the first connecting rod, and a return spring disposed between the first conductive piece and the vacuum tube; there is a gap between the contact piece and the fixed frame.

[0013] By adopting the above technical solution, when the vacuum switch is closed, the moving end impactor moves towards the direction close to the fixed frame. Along with the movement of the moving end impactor, the contact piece will move towards the direction close to the fixed frame against the elastic force of the return spring. At this time, the moving end conductive rod will also move towards the direction close to the third static contact; when the contact piece fits with the fixed frame, the moving end conductive rod will also be connected to the third static contact, so that the vacuum switch is closed; when the vacuum switch is opened, the moving end impactor moves away from the fixed frame. Along with the movement of the moving end impactor, under the action of the return spring, the return spring will drive the conductive piece to move towards the direction close to the contact piece until the moving end conductive rod is separated from the third static contact, so that the vacuum switch is opened.

[0014] Preferably, the moving end impactor includes a limiting frame disposed on the mounting base plate, two impact members symmetrically arranged along the center line of the limiting frame and disposed in the limiting frame, and a first buffer spring disposed between the two impact members; the impact member includes a connecting shaft slidably connected to the limiting frame, impact pieces fixedly connected to both ends of the connecting shaft, and a limiting shaft fixedly connected to the end surface of the impact piece located in the limiting frame and away from the connecting shaft. The buffer spring is sleeved on the limiting shaft and abuts against the impact piece; the extending direction of the connecting shaft is parallel to the sliding direction of the first moving contact.

[0015] By adopting the above technical solution, when the vacuum switch is closed, the moving end impactor moves towards the direction close to the contact piece. Along with the movement of the moving end impactor, the impact piece close to the contact piece will collide and fit with the contact piece. When the contact piece fits with the side surface of the fixed frame, the vacuum switch will be closed; such a design makes the collision between the impact piece and the contact piece an elastic collision, avoiding the possibility of a hard collision between the impact piece and the contact piece, and ensuring the effective service life of the impact piece and the contact piece; at the same time, when the contact piece is impacted by the moving end impactor, when the available stroke of the electromagnet is less than the stroke of the vacuum tube plus the deformable stroke of the first buffer spring, the first buffer spring can deform to enable the electromagnet to act normally in place, avoiding the possibility that the electromagnet still has not acted in place after the contact piece fits with the side surface of the fixed frame, and ensuring the normal development of subsequent operations.

[0016] Preferably, the first moving contact includes a fixing piece disposed on the mounting base plate, second conductive pieces disposed on both sides of the fixing piece and slidably connected to the first static contact and the second static contact, and a fixing member passing through the fixing piece and the second conductive pieces; the fixing member includes a second connecting rod passing through the fixing piece and the two second conductive pieces, a fitting piece disposed on the side of the second conductive piece away from the fixing piece and fixedly connected to the second connecting rod, a blocking piece disposed on the side of the other second conductive piece away from the fixing piece and threadedly connected to the second connecting rod, and a second buffer spring disposed between the blocking piece and the second conductive piece; the fitting piece is in contact with the second conductive piece.

[0017] By adopting the above technical solution, when there are bumps at the positions where the first static contact or the second static contact contacts the second conductive piece, the provided second buffer spring facilitates the two second conductive pieces to move slightly in a direction away from each other, so that the first moving contact can more smoothly achieve a sliding connection with the first static contact and the second static contact.

[0018] Preferably, it further includes a moving-end insulator disposed on the mounting base plate and slidably connected to the mounting base plate; the first moving contact is disposed on the moving-end insulator, and the moving-end impactor is disposed on the moving-end insulator.

[0019] By adopting the above technical solution, it avoids the possibility that the oil switch and the moving-end impactor directly contact the mounting base plate, thereby reducing the possibility of electric leakage. The operation safety is improved.

[0020] Preferably, it further includes an electromagnet disposed on the mounting base plate and a transmission plate disposed on one side of the electromagnet and fixedly connected to the electromagnet; a controller is disposed on one side of the fuel tank; the moving-end insulator is fixedly connected to the transmission plate; the controller is electrically connected to the electromagnet.

[0021] By adopting the above technical solution, when the composite switching switch closes, the controller sends a closing signal to the electromagnet, the electromagnet drives the transmission plate to move in a direction close to the electromagnet, the transmission plate drives the moving-end insulator to move in a direction close to the electromagnet, and the moving-end insulator drives the moving-end impactor to move in a direction close to the electromagnet, thereby achieving closing; when the composite switching switch opens, the controller sends an opening signal to the electromagnet, the electromagnet drives the transmission plate to move in a direction away from the electromagnet, and the transmission plate drives the moving-end insulator and the moving-end impactor to move in a direction away from the electromagnet, thereby achieving opening.

[0022] Preferably, it further includes a slider fixedly connected to the end face of the moving-end insulator close to the mounting base plate, and a sliding groove for the slider to slide is formed on the end face of the mounting base plate close to the moving-end insulator.

[0023] By adopting the above technical solution, the arranged slider and the opened chute avoid the possibility of direct contact between the moving-end insulator and the mounting base plate, thus facilitating the smoother sliding of the moving-end insulator.

[0024] Preferably, it further includes a static-end insulator fixedly connected to the mounting base plate, and the first static contact, the second static contact and the fixing frame are all fixedly connected to the static-end insulator; a secondary outgoing line cover is sleeved on the oil inlet pipe and a secondary sealing terminal arranged in the oil tank; the controller is electrically connected to the secondary sealing terminal, and the electromagnet is electrically connected to the secondary sealing terminal; a waterproof joint for secondary outgoing line is arranged on the secondary outgoing line cover, and the waterproof joint for secondary outgoing line is electrically connected to the secondary sealing terminal.

[0025] By adopting the above technical solution, the arranged secondary sealing terminal plays a role of transition and integration, avoiding the possibility that a variety of electrical components are all individually electrically connected to the controller, and improving the convenience of connection operation; the arranged secondary outgoing line cover and the waterproof joint for secondary outgoing line reduce the possibility of external impurities falling into the oil tank, ensuring the cleanliness of the insulating oil in the oil tank.

[0026] This application also provides a capacitor compensation unit, which includes a capacitor composite switching switch according to any one of claims 1-9, and further includes a protective current transformer arranged on the oil tank and connected to the capacitor composite switching switch, and a reactor arranged above the protective current transformer and integrally cast with the protective current transformer.

[0027] By adopting the above technical solution, the arranged protective current transformer plays a role of current limiting, ensuring the safety of the entire compensation unit; the arranged reactor facilitates providing signals to electrical components and cutting off the faulty circuit when faults such as short circuit and overload occur in the circuit, thus playing a role in protecting the safety of the entire compensation unit.

[0028] In summary, this application has the following technical effects:

[0029] 1. The functions of the arranged oil switch, vacuum switch and moving-end impactor are as follows: when the composite switching switch trips, first the vacuum switch trips, and at this time the arc extinguishing of the vacuum switch is completed in the vacuum tube. Then, after a preset time interval, the oil switch is made to trip. Since the circuit has been disconnected by the vacuum switch at this time, no arc will be generated in the oil switch at this time, thus avoiding the possibility of the insulating oil being carbonized due to high-temperature arc, and further achieving the purpose of maintenance-free; at the same time, since the disconnection of the first switch generates an isolation port, and the vacuum switch and the oil switch are in series, one end of the vacuum tube will be suspended, and the recovery voltage at both ends of the vacuum tube is not sufficient to cause the vacuum switch to reignite, thus achieving the purpose that the switching switch does not generate reignition.

[0030] 2. When the composite switching switch opens, first, the moving-end impactor will separate from the second moving contact, enabling the vacuum switch to open; at the same time, since the time taken for the first moving contact to connect to both the first static contact and the second static contact is less than the time taken for the second moving contact to connect to the third static contact, after a period of time, the first moving contact will separate from the second static contact, enabling the oil switch to open; this design realizes the interval opening of the oil switch and the vacuum switch, thus avoiding the possibility of the oil switch generating an arc and the vacuum switch experiencing reignition, achieving the purpose of maintenance-free operation and no reignition.

[0031] 3. When the vacuum switch closes, the moving-end impactor moves towards the contact piece. Along with the movement of the moving-end impactor, the impact piece close to the contact piece will collide and fit with the contact piece. When the contact piece fits against the side of the fixed frame, the vacuum switch will close; this design makes the collision between the impact piece and the contact piece an elastic collision, avoiding the possibility of a hard collision between the impact piece and the contact piece, ensuring the effective service life of the impact piece and the contact piece; at the same time, when the contact piece is impacted by the moving-end impactor, when the travel of the electromagnet is less than the sum of the travel of the vacuum tube and the deformable travel of the first buffer spring, the deformation of the first buffer spring can enable the electromagnet to operate normally and reach the proper position, avoiding the possibility that the electromagnet still has not reached the proper position after the contact piece fits against the side of the fixed frame, ensuring the normal progress of subsequent operations. Description of the Drawings

[0032] Figure 1 is the structural schematic diagram of the capacitor compensation unit after hiding the cover plate in the embodiment of the present application;

[0033] Figure 2 is Figure 1 the enlarged schematic diagram of the protection current transformer in

[0034] Figure 3 is the structural schematic diagram of the capacitor compensation unit from another perspective after hiding the cover plate in the embodiment of the present application;

[0035] Figure 4 is the partial front view highlighting the capacitor composite switching switch in the embodiment of the present application;

[0036] Figure 5 is the partial bottom view highlighting the positional relationship between the second moving contact and the moving-end impactor in the embodiment of the present application;

[0037] Figure 6 is Figure 5 the enlarged schematic diagram of point B in

[0038] Figure 7 is the partial side view highlighting the capacitor composite switching switch in the embodiment of the present application.

[0039] In the figure, 1 is the fuel tank; 2 is the protective current transformer; 3 is the reactor; 4 is the mounting base plate; 5 is the electromagnet; 6 is the transmission plate; 7 is the moving-end insulator; 8 is the static-end insulator; 9 is the oil switch; 91 is the first moving contact; 911 is the fixing piece; 912 is the second conductive piece; 913 is the fixing member; 9131 is the second connecting rod; 9132 is the fitting piece; 9133 is the blocking piece; 9134 is the second buffer spring; 92 is the first static contact; 93 is the second static contact; 10 is the vacuum switch; 101 is the vacuum tube; 102 is the third static contact; 103 is the second moving contact; 1031 is the moving-end conductive rod; 104 is the first connecting rod; 105 is the contact piece; 106 is the first conductive piece; 107 is the return spring; 11 is the moving-end impactor; 111 is the limiting frame; 112 is the impact member; 1121 is the connecting shaft; 1122 is the impact piece; 1123 is the limiting shaft; 113 is the first buffer spring; 12 is the fixed frame; 13 is the secondary outgoing line cover; 131 is the waterproof joint for secondary outgoing line; 14 is the oil inlet pipe; 15 is the secondary sealing terminal; 16 is the ear plate; 17 is the travel switch. Specific embodiments

[0040] The present application will be further described in detail below with reference to the accompanying drawings.

[0041] Referring to Figure 1 and Figure 2 , the present application provides a capacitor compensation unit, including a vertically arranged fuel tank 1, a capacitor composite switching switch arranged in the fuel tank 1, a protective current transformer 2 fixedly connected to the upper end face of the fuel tank 1 and electrically connected to the capacitor composite switching switch, and a reactor 3 arranged above the protective current transformer 2 and integrally cast with the protective current transformer 2. The upper end face of the fuel tank 1 is communicated with a vertical oil inlet pipe 14, and the upper end of the oil inlet pipe 14 is provided with a bolt with a sealing ring; one end of the protective current transformer 2 extends into the fuel tank 1, and a sealing ring is arranged between the protective current transformer 2 and the fuel tank 1; ear plates 16 are fixedly connected to both side surfaces of the fuel tank 1.

[0042] The provided protective current transformer 2 plays a role in current limiting, ensuring the safety of the entire compensation unit; the provided reactor 3 facilitates providing signals to electrical components and cutting off the fault circuit when faults such as short circuits and overloads occur in the circuit, thereby playing a role in protecting the safety of the entire compensation unit; the provided sealing ring reduces the possibility of the insulating oil in the fuel tank 1 leaking out on the one hand, and reduces the possibility of external impurities entering the fuel tank 1 and making the insulating oil in the fuel tank 1 dirty on the other hand, thereby avoiding the possibility of the insulating oil needing to be replaced; the provided ear plates 16 facilitate moving the fuel tank 1.

[0043] Referring to Figure 1 , Figure 2 and Figure 3, the capacitor composite switching switch includes a mounting base plate 4 vertically arranged and fixedly connected to the oil tank 1, an electromagnet 5 arranged on the mounting base plate 4, a transmission plate 6 horizontally arranged on one side of the electromagnet 5 and fixedly connected to the moving iron core of the electromagnet 5, a moving-end insulator 7 arranged on the mounting base plate 4 and slidably connected to the mounting base plate 4, a static-end insulator 8 fixedly connected to the mounting base plate 4, an oil switch 9 arranged on the moving-end insulator 7 and the static-end insulator 8, a vacuum switch 10 arranged on the static-end insulator 8, and a moving-end impactor 11 arranged on the moving-end insulator 7 to enable the oil switch 9 and the vacuum switch 10 to be started and stopped at intervals; the oil switch 9 and the vacuum switch 10 are connected in series; the electromagnet 5 is connected to the mounting base plate 4 by bolts, and the moving-end insulator 7 is connected to the transmission plate 6 by bolts; the capacitor composite switching switch can be provided with one or more groups; the capacitor compensation unit further includes a controller, and the controller is electrically connected to the electromagnet 5.

[0044] When the composite switching switch is closed, the controller sends a closing signal to the electromagnet 5. The electromagnet 5 drives the drive plate 6 to move in the direction close to the electromagnet 5. The drive plate 6 drives the moving-end insulator 7 to move in the direction close to the electromagnet 5. The moving-end insulator 7 drives the moving-end impactor 11 to move in the direction close to the electromagnet 5, first making the oil switch 9 closed. Along with the movement of the moving-end insulator 7, the vacuum switch 10 will also be closed; when the composite switching switch is opened, the controller sends a tripping signal to the electromagnet 5. The electromagnet 5 drives the drive plate 6 to move away from the electromagnet 5. The drive plate 6 drives the moving-end insulator 7 and the moving-end impactor 11 to move away from the electromagnet 5, first making the vacuum switch 10 open. Along with the movement of the moving-end insulator 7, the oil switch 9 will also be opened; the function of such a design is that when the composite switching switch is opened, first the vacuum switch 10 is opened. At this time, the arc extinguishing of the vacuum switch 10 is completed in the vacuum tube 101. Then, after a preset time interval, the oil switch 9 is opened. Since the circuit has been disconnected by the vacuum switch 10 at this time, no arc will be generated in the oil switch 9 at this time, thus avoiding the possibility of the insulating oil being carbonized due to high-temperature arcs, and further achieving the purpose of maintenance-free; at the same time, since the disconnection of the first switch generates an isolation port, and the vacuum switch 10 and the oil switch 9 are in series, one end of the vacuum tube 101 will be suspended, and the recovery voltage across the two ends of the vacuum tube 101 will not be sufficient to cause the vacuum switch 10 to reignite, thus achieving the purpose that the switching switch does not generate reignition; the provided fuel tank 1 facilitates placing both the oil switch 9 and the vacuum switch 10 in the insulating oil, reducing the volume of the composite switching switch; the provided moving-end insulator 7 and static-end insulator 8 avoid the possibility of the oil switch 9, the vacuum switch 10, and the moving-end impactor 11 directly contacting the mounting base plate 4, thereby reducing the possibility of electric leakage. The operating safety is improved; the capacitor composite switching switch can be provided with one or more groups, that is, the capacitor composite switching switch circuit can be designed as one-phase, two-phase, or three-phase, improving the diversity of use.

[0045] Refer to Figure 1 and Figure 3, To facilitate knowing the on / off state of the composite switching switch, the capacitor composite switching switch further includes a travel switch 17 installed on the mounting base plate 4 and located at the end of the drive plate 6 away from the electromagnet 5. The travel switch 17 is located below the drive plate 6 and is electrically connected to the controller. When the composite switching switch is closed, the controller sends a closing signal to the electromagnet 5, and the electromagnet 5 drives the drive plate 6 to move in the direction close to the electromagnet 5. After the composite switching switch is closed, the drive plate 6 and the travel switch 17 will be in a separated state, and the travel switch 17 will feedback the corresponding electrical signal to the controller, and the controller sends a signal to stop running to the electromagnet 5, so that the drive plate 6 stops moving. When the composite switching switch is opened, the controller sends an opening signal to the electromagnet 5, and the electromagnet 5 drives the drive plate 6 to move in the direction away from the electromagnet 5. After the composite switching switch is opened, the drive plate 6 and the travel switch 17 will be in a contacting state. At this time, the travel switch 17 will feedback the corresponding signal to the controller, and the controller sends a signal to stop running to the electromagnet 5, so that the drive plate 6 stops running. The set travel switch 17 can know the position of the drive plate 6 in real time and feedback the corresponding signal to the controller, and the controller can then know the on / off state of the composite switching switch, thus facilitating more precise control of the moving stroke of the drive plate 6.

[0046] Refer to Figure 1 and Figure 3 , To facilitate the electrical connection between the travel switch 17 and the electromagnet 5 and the controller, the capacitor composite switching switch further includes a secondary sealing terminal 15 installed on the upper end surface of the fuel tank 1 and penetrating into the fuel tank 1. The secondary sealing terminal 15 is arranged on one side of the fuel inlet pipe 14. A cable is die-cast in the secondary sealing terminal 15. One end of the cable is electrically connected to the electromagnet 5 and the travel switch 17, and the other end of the cable is electrically connected to the controller. Such a design plays a transitional role and an integrating role, avoiding the possibility of multiple electrical components being separately connected to the controller and improving the convenience of connection operation.

[0047] Refer to Figure 1 and Figure 3 , To improve the sealing performance between the secondary sealing terminal 15 and the fuel tank 1, a pressure plate that abuts against the upper end surface of the fuel tank 1 is installed on the secondary sealing terminal 15. The cross-section of the pressure plate is N-shaped, and fixing bolts that penetrate the pressure plate and the fuel tank 1 and are threadedly connected to the pressure plate and the fuel tank 1 are arranged on both sides of the secondary sealing terminal 15. Such a design is to press the secondary sealing terminal 15, thereby improving the sealing performance between the secondary sealing terminal 15 and the fuel tank 1 and avoiding the possibility of the insulating oil in the fuel tank 1 leaking out from the position of the secondary sealing terminal 15.

[0048] Refer to Figure 1 and Figure 3, in order to reduce the possibility of external impurities entering the fuel tank 1, the capacitor composite switching switch further includes a secondary outgoing line cover 13 covering the secondary sealing terminal 15 and a waterproof joint 131 for secondary outgoing line installed on the side of the secondary outgoing line cover 13. The secondary outgoing line cover 13 is bolted to the fuel tank 1. The provided secondary outgoing line cover 13 reduces the possibility of external impurities entering the fuel tank 1 and ensures the cleanliness of the insulating oil in the fuel tank 1. The provided waterproof joint 131 for secondary outgoing line, on the one hand, facilitates the locking and fixing of the cable provided between the secondary sealing terminal 15 and the controller, and on the other hand, plays a sealing role and reduces the possibility of external impurities entering the fuel tank.

[0049] Refer to Figure 2 and Figure 4 , in order to enable the oil switch 9 and the vacuum switch 10 to start and stop at intervals, the oil switch 9 includes a first moving contact 91 provided on the moving end insulator 7, a first static contact 92 fixedly connected to the static end insulator 8, and a second static contact 93 provided on the side of the first static contact 92 away from the first moving contact 91 and fixedly connected to the static end insulator 8. The first moving contact 91 is slidably connected to both the first static contact 92 and the second static contact 93 along the direction of the connection line of the first static contact 92 and the second static contact 93. The length of the first moving contact 91 is greater than the distance between the end faces of the first static contact 92 and the second static contact 93 that are close to each other. The first static contact 92 is vertically arranged, and a wiring terminal is connected to the upper end of the first static contact 92. The first static contact 92 and the second static contact 93 are perpendicular to each other.

[0050] Refer to Figure 4 , Figure 5 and Figure 6 , the vacuum switch 10 includes a vacuum tube 101 provided on the side of the second static contact 93 away from the mounting base plate 4 and bolted to the static end insulator 8, a third static contact 102 provided in the vacuum tube 101, and a second moving contact 103 provided on the side of the third static contact 102 close to the first moving contact 91. One end of the third static contact 102 extends outside the vacuum tube 101 and is connected to another wiring terminal. The connection between the moving end impactor 11 and the second moving contact 103 is parallel to the sliding direction of the moving end insulator 7. The distance between the end faces of the first static contact 92 and the second static contact 93 that are close to each other is less than the distance between the end faces of the moving end impactor 11 and the second moving contact 103 that are close to each other.

[0051] Before the composite switching switch closes, the first moving contact 91 and the first static contact 92 are in a connected state; when the composite switching switch closes, the controller sends a closing signal to the electromagnet 5, and the electromagnet 5 drives the moving-end insulator 7 to move in the direction close to the electromagnet 5. Along with the movement of the moving-end insulator 7, first of all, the first moving contact 91 will simultaneously connect with the first static contact 92 and the second static contact 93, so that the oil switch 9 is closed; since the distance between the mutually approaching end faces of the first static contact 92 and the second static contact 93 is less than the distance between the mutually approaching end faces of the moving-end striker 11 and the second moving contact 103, at this time only the oil switch 9 is closed; along with the continuous movement of the moving-end insulator 7, the moving-end striker 11 will collide with the second moving contact 103, and then the second moving contact 103 will contact with the third static contact 102, so that the vacuum switch 10 is closed; such a design realizes the interval start of the oil switch 9 and the vacuum switch 10; when the composite switching switch opens, the controller sends a tripping signal to the electromagnet 5, and the electromagnet 5 drives the moving-end insulator 7 to move in the direction away from the electromagnet 5. Along with the movement of the moving-end insulator 7, first of all, the moving-end striker 11 will separate from the second moving contact 103, so that the vacuum switch 10 is opened; since the distance between the mutually approaching end faces of the first static contact 92 and the second static contact 93 is less than the distance between the mutually approaching end faces of the moving-end striker 11 and the second moving contact 103, at this time only the vacuum switch 10 is opened; along with the continuous movement of the moving-end insulator 7, the first moving contact 91 will separate from the second static contact 93, so that the oil switch 9 is opened; such a design realizes the interval opening of the oil switch 9 and the vacuum switch 10, thus avoiding the possibility of the oil switch 9 generating an arc and the vacuum switch 10 reigniting, achieving the purpose of maintenance-free and no reignition.

[0052] Refer to Figure 5 and Figure 6, To enable the vacuum switch 10 to perform closing and opening operations, the capacitor composite switching switch further includes a fixed frame 12 disposed at one end of the vacuum tube 101 near the moving end striker 11 and bolt-connected to the static end insulator 8. The cross-section of the fixed frame 12 is generally in the shape of a door; the second moving contact 103 includes a moving end conductive rod 1031 extending into the fixed frame 12 and slidably connected to the vacuum tube 101; the vacuum switch 10 further includes a first connecting rod 104 disposed at one end of the moving end conductive rod 1031 away from the third static contact 102 and thread-connected to the moving end conductive rod 1031, a contact piece 105 disposed at one end of the first connecting rod 104 away from the moving end conductive rod 1031 and outside the fixed frame 12, a first conductive piece 106 disposed in the fixed frame 12 and fixedly connected to the first connecting rod 104, and a return spring 107 disposed between the first conductive piece 106 and the fixed frame 12; there is a gap between the contact piece 105 and the fixed frame 12, the contact piece 105 is coaxial with the first connecting rod 104 and integrally formed, the first connecting rod 104 is slidably connected to the fixed frame 12, the return spring 107 abuts against both the first conductive piece 106 and the fixed frame 12, and the first conductive piece 106 is electrically connected to the second static contact 93.

[0053] When the vacuum switch 10 closes, the moving end insulator 7 drives the moving end striker 11 to move towards the fixed frame 12 until the moving end striker 11 abuts against the contact piece 105. Then, as the moving end striker 11 continues to move, the contact piece 105 will overcome the elastic force of the return spring 107 and move towards the fixed frame 12. At this time, the moving end conductive rod 1031 will also move towards the third static contact 102; when the contact piece 105 fits with the fixed frame 12, the moving end conductive rod 1031 will also be connected to the third static contact 102, thereby enabling the vacuum switch 10 to close; when the vacuum switch 10 opens, the moving end insulator 7 drives the moving end striker 11 to move away from the fixed frame 12. As the moving end striker 11 moves, under the action of the return spring 107, the return spring 107 will drive the conductive piece to move towards the contact piece 105. At this time, the moving end conductive rod 1031 will be separated from the third static contact 102, thereby enabling the vacuum switch 10 to open; then when the moving end striker 11 is separated from the contact piece 105, the contact piece 105 will also be reset under the action of the return spring 107, thus preparing for the next closing operation.

[0054] Refer to Figure 2 , Figure 4 and Figure 5, in order to reduce the collision force between the moving end impactor 11 and the contact piece 105, the moving end impactor 11 includes a defining frame 111 fixedly connected to the moving end insulator 7 and arranged perpendicular to the first moving contact 91, two impact members 112 arranged symmetrically along the center line of the defining frame 111 and disposed within the defining frame 111, and a first buffer spring 113 disposed between the two impact members 112; the impact member 112 includes a connecting shaft 1121 slidably connected to the defining frame 111, impact pieces 1122 integrally formed at both ends of the connecting shaft 1121 and coaxial with the connecting shaft 1121, and a defining shaft 1123 fixedly connected to the end face of the impact piece 1122 located within the defining frame 111 and remote from the connecting shaft 1121, wherein the defining shaft 1123 is coaxial and integrally formed with the connecting shaft 1121, the extending direction of the connecting shaft 1121 is parallel to the sliding direction of the moving end insulator 7, the first buffer spring 113 is sleeved on the defining shaft 1123 and abuts against the two oppositely arranged impact pieces 1122; the distance between the impact piece 1122 disposed close to the contact piece 105 and the contact piece 105 is less than the distance between the end faces of the two static contacts approaching each other.

[0055] When the vacuum switch 10 is closed, the moving end insulator 7 drives the moving end impactor 11 to move in the direction close to the contact piece 105. Along with the movement of the moving end impactor 11, the impact piece 1122 close to the contact piece 105 will collide and fit with the contact piece 105. After the contact piece 105 is in contact with the side surface of the fixed frame 12, the vacuum switch 10 can be closed; such a design makes the collision between the impact piece 1122 and the contact piece 105 an elastic collision, avoiding the possibility of a hard collision between the impact piece 1122 and the contact piece 105, reducing the possibility of damage to the impact piece 1122 and the contact piece 105 after the collision, thereby ensuring the effective service life of the impact piece 1122 and the contact piece 105; at the same time, when the contact piece 105 is impacted by the moving end impactor 11, when the available stroke of the electromagnet 5 is less than the stroke of the vacuum tube 101 plus the deformable stroke of the first buffer spring 113, the electromagnet 5 can be enabled to act normally in place through the deformation of the first buffer spring 113, avoiding the possibility that the electromagnet 5 still fails to act in place after the contact piece 105 is in contact with the side surface of the fixed frame 12, and ensuring the normal development of subsequent operations.

[0056] Refer to Figure 7, in order to enable the first moving contact 91 to smoothly slide connect with the first static contact 92 and the second static contact 93, the first moving contact 91 includes a fixing piece 911 fixedly connected to the moving-end insulator 7, second conductive pieces 912 arranged on both sides of the fixing piece 911 and in sliding connection with the first static contact 92 and the second static contact 93, and a fixing member 913 passing through the fixing piece 911 and the two second conductive pieces 912; wherein the fixing piece 911 is parallel to the first static contact 92 and the second static contact 93, the end faces of the first static contact 92 and the second static contact 93 close to each other are processed with protrusions, and the first static contact 92 is provided with a groove matching the protrusion; the fixing member 913 includes a second connecting rod 9131 passing through the fixing piece 911 and the two second conductive pieces 912, a fitting piece 9132 arranged on the side of the second conductive piece 912 away from the fixing piece 911 and fitting with the fixing piece 911, a blocking piece 9133 arranged on the side of the other second conductive piece 912 away from the fixing piece 911 and in threaded connection with the second connecting rod 9131, and a second buffer spring 9134 arranged between the blocking piece 9133 and the fixing piece 911, wherein the second connecting rod 9131 is perpendicular to the fixing piece 911; the cross-section of the second conductive piece 912 is generally L-shaped, and the end faces of the two second conductive pieces 912 close to each other are both in contact with the fixing piece 911; the fitting piece 9132 is coaxial and integrally formed with the second connecting rod 9131, and the second buffer spring 9134 is in contact with both the second conductive piece 912 and the blocking piece 9133.

[0057] When the oil switch 9 is closed, the moving-end insulator 7 moves towards the direction close to the second static contact 93, and the two second conductive pieces 912 are in sliding connection with the first static contact 92. As the moving-end insulator 7 moves, the two second conductive pieces 912 will come into contact with the second static contact 93 and become in sliding connection, thereby enabling the oil switch 9 to be closed; when the oil switch 9 is opened, the moving-end insulator 7 moves away from the direction of the second static contact 93, and the oil switch 9 can be opened until the two second conductive pieces 912 are separated from the second static contact 93; when there are bumps at the positions where the first static contact 92 or the second static contact 93 contacts the second conductive piece 912, the provided second buffer spring 9134 facilitates the two second conductive pieces 912 to move slightly away from each other, thereby facilitating the first moving contact 91 to more smoothly slide connect with the first static contact 92 and the second static contact 93; the provided protrusions play a limiting role and reduce the possibility of the first static contact 92 and the second static contact 93 randomly shaking between the two second conductive pieces 912; the shape design of the second conductive piece 912 improves the stability of the connection between the second conductive piece 912 and the fixing piece 911 and reduces the possibility of the second conductive piece 912 randomly shaking.

[0058] Refer to Figure 1 , Figure 3 andFigure 4 To enable the moving-end insulator 7, the first moving contact 91, and the moving-end impactor 11 to achieve good sliding, the capacitor composite switching switch further includes a slider fixedly connected to the end face of the moving-end insulator 7 close to the mounting base plate 4. A sliding groove for the slider to slide is opened on the end face of the mounting base plate 4 close to the moving-end insulator 7. In the embodiment of the present application, the shape of the slider is waist-shaped; when the moving-end insulator 7 moves, the provided slider and the opened sliding groove avoid the possibility of direct contact between the moving-end insulator 7 and the mounting base plate 4, thus facilitating the smoother sliding of the moving-end insulator 7.

[0059] In summary, the usage process of the present application is as follows: when the composite switching switch is closed, the first moving contact 91 and the first static contact 92 are in a connected state. The controller sends a closing signal to the electromagnet 5, and the electromagnet 5 drives the transmission plate 6 to move in the direction close to the electromagnet 5. The transmission plate 6 drives the moving-end insulator 7 to move in the direction close to the electromagnet 5, and the moving-end insulator 7 drives the moving-end impactor 11 to move in the direction close to the electromagnet 5; first, the first moving contact 91 will be connected to both the first static contact 92 and the second static contact 93 simultaneously, so that the oil switch 9 is closed; after a period of time, the impact piece 1122 will collide with the contact piece 105. Along with the continuous movement of the moving-end impactor 11, the contact piece 105 will overcome the elastic force of the return spring 107 and move in the direction close to the fixed frame 12. At this time, the moving-end conducting rod 1031 will also move in the direction close to the third static contact 102; when the contact piece 105 is in contact with the fixed frame 12, the moving-end conducting rod 1031 will also be connected to the third static contact 102, so that the vacuum switch 10 is closed.

[0060] When the composite switching switch is opened, the controller sends an opening signal to the electromagnet 5, and the electromagnet 5 drives the transmission plate 6 to move in the direction away from the electromagnet 5. The transmission plate 6 drives the moving-end insulator 7 and the moving-end impactor 11 to move in the direction away from the electromagnet 5; first, the moving-end insulator 7 drives the moving-end impactor 11 to move in the direction away from the fixed frame 12. Along with the movement of the moving-end impactor 11, under the action of the return spring 107, the return spring 107 will drive the conducting piece to move in the direction close to the contact piece 105. At this time, the moving-end conducting rod 1031 will be separated from the third static contact 102, so that the vacuum switch 10 is opened; then along with the continuous movement of the moving-end insulator 7, the first moving contact 91 will be separated from the second static contact 93, so that the oil switch 9 is opened.

[0061] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A capacitor composite switching switch, characterized in that: It is arranged inside the fuel tank (1), and the fuel tank (1) is connected with an inlet pipe (14); it includes a mounting base plate (4) arranged inside the fuel tank (1), an oil switch (9), a vacuum switch (10) and a moving end impactor (11) arranged on the mounting base plate (4); the oil switch (9) and the vacuum switch (10) are connected in series; When the composite switching switch is closed, the moving end impactor (11) makes the oil switch (9) close first, and then makes the vacuum switch (10) close within a preset time; When the composite switching switch is opened, the moving end impactor (11) makes the vacuum switch (10) open first, and then makes the oil switch (9) open within a preset time; The oil switch (9) includes a first static contact (92) arranged on the mounting base plate (4), a second static contact (93) arranged on one side of the first static contact (92), and a first moving contact (91) slidably connected to the mounting base plate (4) along the extension line direction of the first static contact (92) and the second static contact (93). The first moving contact (91) is slidably connected to both the first static contact (92) and the second static contact (93), and the first moving contact (91) is fixedly connected to the moving end impactor (11); the vacuum switch (10) includes a vacuum tube (101) arranged on one side of the second static contact (93), a third static contact (102) arranged inside the vacuum tube (101), and a second moving contact (103) arranged on the side of the third static contact (102) close to the first moving contact (91); the first static contact (92) is connected to the wiring terminal, the second static contact (93) is connected to the second moving contact (103), and the third static contact (102) is connected to another wiring terminal; the moving end impactor (11) is connected to the first moving contact (91), and the connection line between the moving end impactor (11) and the second moving contact (103) is parallel to the sliding direction of the first moving contact (91); the time taken for the first moving contact (91) to connect to both the first static contact (92) and the second static contact (93) is less than the time taken for the second moving contact (103) to connect to the third static contact (102); It also includes a fixed frame (12) arranged on the side of the vacuum tube (101) close to the moving end impactor (11); the second moving contact (103) includes a moving end conductive rod (1031) extending into the fixed frame (12); the vacuum switch (10) also includes a first connecting rod (104) arranged at the end of the moving end conductive rod (1031) far from the third static contact (102) and connected to the moving end conductive rod (1031), a contact piece (105) arranged at the end of the first connecting rod (104) far from the moving end conductive rod (1031) and outside the fixed frame (12), a first conductive sheet (106) arranged inside the fixed frame (12) and fixedly connected to the first connecting rod (104), and a return spring (107) arranged between the first conductive sheet (106) and the vacuum tube (101); there is a gap between the contact piece (105) and the fixed frame (12); the first conductive sheet (106) is electrically connected to the second static contact (93); The moving-end impactor (11) includes a limiting frame (111) arranged on the mounting base plate (4), two impact members (112) arranged symmetrically along the center line of the limiting frame (111) and disposed within the limiting frame (111), and a first buffer spring (113) disposed between the two impact members (112); the impact member (112) includes a connecting shaft (1121) slidably connected to the limiting frame (111), impact plates (1122) fixedly connected to both ends of the connecting shaft (1121), and a limiting shaft (1123) fixedly connected to the end face of the impact plate (1122) located within the limiting frame (111) and away from the connecting shaft (1121), the buffer spring is sleeved on the limiting shaft (1123) and abuts against the impact plate (1122); the extending direction of the connecting shaft (1121) is parallel to the sliding direction of the first moving contact (91).

2. The composite switching switch for capacitor according to claim 1, characterized in that: The first moving contact (91) includes a fixing plate (911) arranged on the mounting base plate (4), second conductive plates (912) arranged on both sides of the fixing plate (911) and slidably connected to the first static contact (92) and the second static contact (93), and a fixing member (913) passing through the fixing plate (911) and the second conductive plates (912); the fixing member (913) includes a second connecting rod (9131) passing through the fixing plate (911) and the two second conductive plates (912), a fitting plate (9132) arranged on the side of the second conductive plate (912) away from the fixing plate (911) and fixedly connected to the second connecting rod (9131), a blocking plate (9133) arranged on the side of the other second conductive plate (912) away from the fixing plate (911) and threadedly connected to the second connecting rod (9131), and a second buffer spring (9134) arranged between the blocking plate (9133) and the second conductive plate (912); the fitting plate (9132) is in contact with the second conductive plate (912).

3. The composite switching switch for a capacitor according to claim 1, characterized in that: It further includes a moving-end insulator (7) arranged on the mounting base plate (4) and slidably connected to the mounting base plate (4); the first moving contact (91) is arranged on the moving-end insulator (7), and the moving-end impactor (11) is arranged on the moving-end insulator (7).

4. The capacitor composite switching switch according to claim 3, wherein: It further includes an electromagnet (5) arranged on the mounting base plate (4) and a transmission plate (6) arranged on one side of the electromagnet (5) and fixedly connected to the electromagnet (5); a controller is arranged on one side of the fuel tank (1); the moving-end insulator (7) is fixedly connected to the transmission plate (6); the controller is electrically connected to the electromagnet (5).

5. A capacitor composite switching switch according to claim 3, characterized in that: It further includes a slider fixedly connected to the end face of the moving-end insulator (7) close to the mounting base plate (4), and a sliding groove for the slider to slide is formed on the end face of the mounting base plate (4) close to the moving-end insulator (7).

6. The composite switching switch for a capacitor according to claim 1, characterized in that: It further includes a static end insulator (8) fixedly connected to the mounting base plate (4), and the first static contact (92), the second static contact (93) and the fixing frame (12) are all fixedly connected to the static end insulator (8); a secondary outgoing line cover (13) is sleeved on the oil inlet pipe (14), and a secondary sealing terminal (15) is arranged in the oil tank (1); the controller is electrically connected to the secondary sealing terminal (15), and the electromagnet (5) is electrically connected to the secondary sealing terminal (15); a waterproof joint (131) for secondary outgoing line is arranged on the secondary outgoing line cover (13), and the waterproof joint (131) for secondary outgoing line is electrically connected to the secondary sealing terminal (15).

7. A capacitor compensation unit, comprising a capacitor composite switching switch according to any one of claims 1-6, characterized in that: It further includes a protection current transformer (2) arranged on the oil tank (1) and connected to the capacitor composite switching switch, and a reactor (3) arranged above the protection current transformer (2) and integrally cast with the protection current transformer (2).

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