Vacuum circuit breaker

Abstract

The invention relates to a vacuum circuit breaker. The vacuum circuit breaker comprises a moving contact, a static contact and a hydraulic mechanism, and in a closing state, the output end of the hydraulic mechanism is connected with the moving contact to provide closing retention force for the moving contact. The hydraulic force output by the hydraulic mechanism can be regulated and controlled by controlling the pressure and the flow direction of the liquid, so that the hydraulic force can be output according to the actual electrodynamic force of the moving contact, the direction of the hydraulic force is opposite to that of the electrodynamic force, and the hydraulic force is larger than that of the electrodynamic force, so that the moving contact keeps in contact with the static contact; the problem of unstable contact or poor contact between a moving contact and a static contact is solved, and the closing stability of the vacuum circuit breaker is improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to vacuum circuit breakers. Background Art

[0002] Vacuum Circuit Breaker (VCB) is a high-voltage switchgear that uses a high vacuum environment as an arc extinguishing and insulating medium. It is widely used in power systems for circuit disconnection, closing, and fault protection.

[0003] In a vacuum circuit breaker, the moving contact and the stationary contact in the vacuum interrupter are flat-plate docking structures. When the vacuum circuit breaker is in the closed state, that is, the moving contact and the stationary contact are in conductive contact, the current flowing through will generate a repulsive electromotive force between the moving contact and the stationary contact. In order to avoid the moving contact in contact with the stationary contact being disengaged due to the electromotive force when the current is flowing, resulting in poor contact, an additional closing holding force is required to overcome the electromotive force.

[0004] In the related art, an overtravel spring is arranged on the moving contact, and the overtravel spring is compressed by the overtravel to provide the moving contact with additional closing holding force to overcome the electromotive force and ensure reliable closing. However, the force provided by the overtravel spring during deformation changes linearly with the deformation amount, which is inconsistent with the change of the electromotive force of the moving contact. There is a problem that the electromotive force cannot be completely overcome, so there is still a risk of unstable contact between the moving contact and the stationary contact. Summary of the invention

[0005] Based on this, it is necessary to provide a vacuum circuit breaker to address the problem of unstable contact between the moving contact and the static contact of the existing vacuum circuit breaker.

[0006] A vacuum circuit breaker, comprising:

[0007] Stationary contact;

[0008] The moving contact is arranged along the first direction with the static contact; when the vacuum circuit breaker is in a closed state, the moving contact is in conductive contact with the static contact; when the vacuum circuit breaker is in an open state, the moving contact is disconnected from the static contact;

[0009] The hydraulic mechanism, when in the closed state, the output end of the hydraulic mechanism is connected to the moving contact to provide the moving contact with a holding force pointing from the moving contact to the static contact, and the holding force is greater than the electric force of the moving contact.

[0010] In one of the embodiments, the output end of the hydraulic mechanism is connected to the moving contact, and the hydraulic mechanism is used to drive the moving contact to move closer to or farther away from the static contact to switch between the closed state and the open state.

[0011] In one embodiment, the hydraulic mechanism comprises:

[0012] A hydraulic cylinder, wherein the hydraulic cylinder is slidably connected to a piston rod, and the piston rod is connected to the moving contact;

[0013] A hydraulic pump is connected to the hydraulic cylinder, and is used to pump liquid into the hydraulic cylinder to drive the piston rod to move along the first direction.

[0014] In one embodiment, both ends of the hydraulic cylinder along the first direction are provided with liquid interfaces, and a liquid circuit is connected between the liquid interface and the hydraulic pump;

[0015] The liquid circuit is connected with a pressure control unit.

[0016] In one of the embodiments, the vacuum circuit breaker further comprises a three-way pipe, two connection interfaces of the three-way pipe are respectively connected to the two liquid circuits, and the other connection interface of the three-way pipe is connected to the pressure control unit.

[0017] In one embodiment, the hydraulic mechanism is arranged on one side of the moving contact along a second direction, and the second direction is perpendicular to the first direction;

[0018] The vacuum circuit breaker further includes a transmission mechanism connected between an output end of the hydraulic mechanism and the moving contact to transmit the driving force of the hydraulic mechanism to the moving contact.

[0019] In one embodiment, the transmission mechanism includes a first transmission rod, at least a portion of the first transmission rod is arranged along the second direction, one end of the first transmission rod is connected to the output end of the hydraulic mechanism, and the other end of the first transmission rod is connected to the moving contact.

[0020] In one embodiment, the transmission mechanism further comprises a first transmission assembly, one end of the first transmission assembly is rotatably connected to the output end of the hydraulic mechanism, and the other end of the first transmission assembly is rotatably connected to the first transmission rod;

[0021] The first transmission assembly is used to convert the movement of the output end of the hydraulic mechanism along the first direction into the movement of the first transmission rod along the second direction.

[0022] In one embodiment, the transmission mechanism further includes a second transmission assembly, one end of the second transmission assembly is rotatably connected to an end of the first transmission rod away from the hydraulic mechanism, and the other end of the second transmission assembly is rotatably connected to the moving contact;

[0023] The second transmission assembly is used to convert the movement of the first transmission rod along the second direction into the movement of the moving contact along the first direction.

[0024] In one embodiment, the first transmission assembly includes a first swinging member and a second swinging member arranged at an angle to the first swinging member and fixedly connected; one end of the first swinging member away from the second swinging member is rotatably connected to the output end of the hydraulic mechanism, and one end of the second swinging member away from the first swinging member is connected to one end of the first transmission rod away from the moving contact; and / or,

[0025] The second transmission assembly includes a third swinging member and a fourth swinging member that is arranged at an angle to and fixedly connected to the third swinging member; one end of the third swinging member away from the fourth swinging member is rotatably connected to one end of the first transmission rod away from the hydraulic mechanism, and one end of the fourth swinging member away from the third swinging member is rotatably connected to the moving contact.

[0026] The above-mentioned vacuum circuit breaker includes a moving contact, a static contact and a hydraulic mechanism. In the closed state, the output end of the hydraulic mechanism is connected to the moving contact to provide the moving contact with a closing holding force. By controlling the pressure and flow direction of the liquid, the size of the hydraulic pressure output by the hydraulic mechanism can be adjusted, so that the hydraulic pressure can be output according to the actual electric power of the moving contact, so that the direction of the hydraulic pressure is opposite to that of the electric power, and the size of the hydraulic pressure is greater than the electric power, so that the moving contact and the static contact are kept in contact, so as to solve the problem of unstable contact or poor contact between the moving contact and the static contact, and improve the closing stability of the vacuum circuit breaker. In addition, when the prior art uses an overtravel spring, it is also necessary to use components such as inner diameter guide pins such as a spring cylinder to avoid problems such as skewness, eccentricity, and buckling of the spring, thereby increasing the motion mass of the vacuum circuit breaker. However, the present application does not need to use an overtravel spring, so it can reduce the motion mass of the vacuum circuit breaker and save operating power. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a vacuum circuit breaker provided in one embodiment of the present application.

[0028] Figure 2 for Figure 1 A partial schematic diagram of a vacuum circuit breaker is shown.

[0029] Figure numbers: 110, static contact; 120, moving contact; 130, second transmission rod; 140, moving conductive rod; 150, moving pull rod; 160, static conductive rod; 200, hydraulic mechanism; 210, hydraulic cylinder; 211, liquid interface; 220, piston rod; 230, hydraulic pump; 240, three-way pipe; 250, pressure control unit; 260, liquid circuit; 300, transmission mechanism; 310, first transmission rod; 320, first transmission assembly; 321, first swinging member; 322, second swinging member; 330, second transmission assembly; 331, third swinging member; 332, fourth swinging member. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] See also Figure 1 and Figure 2 As shown, a vacuum circuit breaker provided by an embodiment of the present application includes a static contact 110, a moving contact 120 and a hydraulic mechanism 200; the moving contact 120 and the static contact 110 are arranged along a first direction; when the vacuum circuit breaker is in a closed state, the moving contact 120 is in conductive contact with the static contact 110; when the vacuum circuit breaker is in an open state, the moving contact 120 is disconnected from the static contact 110, and a certain separation distance is maintained between the moving contact 120 and the static contact 110; in the closed state, the output end of the hydraulic mechanism 200 is connected to the moving contact 120 to provide the moving contact 120 with a holding force that automatically points the contact 120 in the direction of the static contact 110, and the holding force is greater than the electric force of the moving contact 120. Figure 1 As shown, the first direction is indicated by arrow X, and the second direction is indicated by arrow Y.

[0037] Among them, the static contact 110 is a relatively stationary component during the opening and closing operations of the vacuum circuit breaker, and the moving contact 120 is a relatively moving component during the opening and closing operations of the vacuum circuit breaker. The conduction and disconnection of the conductive circuit of the vacuum circuit breaker are realized by closing and opening the static contact 110 and the moving contact 120, wherein the static contact 110 and the moving contact 120 are located in the vacuum arc extinguishing chamber of the vacuum circuit breaker.

[0038] In the above-mentioned vacuum circuit breaker, when in the closed state, the output end of the hydraulic mechanism 200 is connected to the moving contact 120 to provide the moving contact 120 with a closing holding force. By controlling the pressure and flow direction of the liquid, the size of the hydraulic pressure output by the hydraulic mechanism 200 can be adjusted, so that the hydraulic pressure can be output according to the actual electric power size of the moving contact 120, so that the hydraulic pressure is opposite to the direction of the electric power, and the size of the hydraulic pressure is greater than the electric power, so that the moving contact 120 and the static contact 110 are kept in contact, so as to solve the problem of unstable or poor contact between the moving contact 120 and the static contact 110, and improve the closing stability of the vacuum circuit breaker. In addition, when the prior art uses an overtravel spring, it is also necessary to use components such as inner diameter guide pins such as spring cylinders to avoid problems such as skewness, eccentricity, and buckling of the spring, thereby increasing the motion mass of the vacuum circuit breaker. However, the present application does not need to use an overtravel spring, so it can reduce the motion mass of the vacuum circuit breaker and save operating power.

[0039] In some embodiments, the voltage level of the vacuum circuit breaker provided in the present application is 252KV.

[0040] See also Figure 1 and Figure 2 As shown, in one embodiment, the output end of the hydraulic mechanism 200 is connected to the moving contact 120, that is, the hydraulic mechanism 200 can drive the moving contact 120 to approach or move away from the static contact 110. When the moving contact 120 moves in the direction close to the static contact 110 and contacts the static contact 110, it corresponds to the closed state; it is ensured that during the closing operation, the moving contact 120 and the static contact 110 quickly stabilize, thereby ensuring the reliability of the live operation of the vacuum circuit breaker, and avoiding multiple arc burning and contact ablation caused by closing bounce between the moving contacts 120 during the live operation of the vacuum circuit breaker. When the moving contact 120 moves in the direction away from the static contact 110 and is disconnected from the static contact 110, and a certain separation distance is maintained between the moving contact 120 and the static contact 110, it corresponds to the open state, so that the vacuum circuit breaker can be switched between the closed state and the open state through the hydraulic mechanism 200 without setting an additional operating mechanism.

[0041] In some embodiments, the vacuum circuit breaker includes a control system, and when the power system detects an abnormal situation, such as a short circuit, overload, etc., a trip signal is sent to the control system of the vacuum circuit breaker. The control system controls the hydraulic mechanism 200 to move so as to push the moving contact 120 away from the static contact 110 quickly, so that the circuit is disconnected, and the moving contact 120 and the static contact 110 maintain a certain distance, so that the vacuum circuit breaker can be opened and closed effectively and quickly. After confirming that the fault has been cleared and power supply can be restored, the control system receives a closing command. The control system triggers the hydraulic mechanism 200 to push the moving contact 120 toward the static contact 110 until the two are in close contact. After the moving contact 120 and the static contact 110 are closed, the current begins to flow through the vacuum circuit breaker and normal power supply is restored.

[0042] See also Figure 1 and Figure 2 As shown, in one embodiment, the hydraulic mechanism 200 includes a hydraulic cylinder 210 and a hydraulic pump 230, the hydraulic cylinder 210 is slidably connected with a piston rod 220, and the piston rod 220 is connected to the moving contact 120; the hydraulic pump 230 is connected to the hydraulic cylinder 210, and the hydraulic pump 230 is used to pump liquid such as hydraulic oil into the hydraulic cylinder to drive the piston rod to move along the first direction X.

[0043] like Figure 2 As shown, in some embodiments, the hydraulic cylinder 210 is a hollow pipe, and the top of the hydraulic cylinder 210 is Figure 2 An opening (not shown in the figure) is provided at the upper part of the hydraulic cylinder 210, and the piston rod 220 passes through the opening and is slidably connected to the inner wall of the hydraulic cylinder 210. In some embodiments, a seal is provided at the opening to ensure the sealing performance of the hydraulic cylinder 210 and prevent liquid from leaking. In some embodiments, the hydraulic pump 230 is an oil pump, and the speed of the piston rod 220 moving along the first direction X can be controlled by controlling the oil output and the oil output pressure of the oil pump. During the closing process, the moving speed of the moving contact 120 relative to the static contact 110 is controlled by controlling the oil output and the oil output pressure; when the moving contact 120 is in conductive contact with the static contact 110, the oil output or the oil output pressure can be reduced, that is, the closing holding force can be less than the closing moving force. During the opening process, the speed of the moving contact 120 separating from the static contact 110 is controlled by controlling the oil output and the oil output pressure, so that the three-stage opening of fast-slow-fast can be better realized, and the control of different separation speeds during the opening process can be better maintained.

[0044] See also Figure 1 and Figure 2 As shown, in one embodiment, the hydraulic cylinder 210 is provided with liquid interfaces 211 at both ends along the first direction X, and a liquid circuit 260 is connected between the liquid interface 211 and the hydraulic pump 230. In some embodiments, one of the liquid interfaces 211 is a liquid inlet interface, and one of the liquid interfaces 211 is a liquid outlet interface. Figure 2 In the illustrated embodiment, the liquid interface 211 at the lower end is a liquid inlet interface, and the liquid interface 211 at the upper end is a liquid outlet interface. The hydraulic pump 230 allows liquid to enter the rodless chamber of the hydraulic cylinder 210, i.e., the lower part of the hydraulic cylinder 210, through the liquid inlet interface at the lower end, thereby pushing the piston rod 220 to move upward. At the same time, the piston rod 220 squeezes the rod chamber, i.e., the upper part of the hydraulic cylinder 210, and the liquid flows back to the hydraulic pump 230 through the liquid outlet interface at the upper end.

[0045] In some embodiments, the hydraulic pump 230 can realize forward and reverse rotation, thereby being able to change the direction of liquid delivery. In some embodiments, the liquid interface 211 at the upper end is a liquid inlet interface, and the liquid interface 211 at the lower end is a liquid outlet interface. The hydraulic pump 230 allows the liquid to enter the rod chamber of the hydraulic cylinder 210, i.e., the upper part of the hydraulic cylinder 210, through the liquid inlet interface at the upper end, thereby pushing the piston rod 220 downward. At the same time, the piston rod 220 squeezes the rodless chamber, i.e., the lower part of the hydraulic cylinder 210, and the liquid flows back to the hydraulic pump 230 through the liquid outlet interface at the lower end.

[0046] See also Figure 2 As shown, in some embodiments, a pressure control unit 250 is connected to the liquid circuit 260. The pressure of the liquid is controlled by a pressure control valve. In some embodiments, the pressure control valve can be a pressure reducing valve. When the output liquid pressure is greater than a preset value, the pressure control unit 250 is opened to achieve pressure relief. For example, when the moving force output by the hydraulic mechanism 200 causes the moving contact 120 to move to contact with the static contact 110, the closing holding force output by the hydraulic mechanism 200 can be less than the moving force, which can be achieved by opening the pressure control unit 250. In some embodiments, the pressure control unit 250 is a pressure relief valve or a relief valve. In some embodiments, solenoid valves are provided on the two liquid circuits 260, and the on and off of the liquid circuits 260 can be controlled by the solenoid valves.

[0047] In some embodiments, the hydraulic pump 230 is an oil pump, and the vacuum circuit breaker also includes an oil tank. The oil pump can be connected to the oil outlet interface of the oil tank through a flange. Through the cooperation of the oil pump and the oil outlet interface, the hydraulic oil in the oil tank is pumped out, and the oil pressure of the pumped hydraulic oil is controlled by the pressure control valve to deliver the hydraulic oil to the hydraulic cylinder 210.

[0048] See also Figure 1 and Figure 2As shown, in one embodiment, the vacuum circuit breaker further includes a three-way pipe 240, two of the connection interfaces of the three-way pipe 240 are respectively connected to two liquid circuits 260, and the other connection interface of the three-way pipe 240 is connected to the pressure control unit 250. For example, when the pressure of the liquid circuit 260 at the lower end needs to be adjusted, the pressure relief control unit is connected to the liquid circuit 260 at the lower end. When the pressure of the liquid circuit 260 at the upper end needs to be adjusted, the pressure relief control unit is connected to the liquid circuit 260 at the upper end. With this arrangement, only one pressure control unit 250 is required to achieve pressure regulation of the two liquid circuits 260.

[0049] See also Figure 1 and Figure 2 As shown, in one embodiment, the hydraulic mechanism 200 is arranged on one side of the moving contact 120 along the second direction Y, and the second direction Y is perpendicular to the first direction X; by arranging the hydraulic mechanism 200 on one side of the moving contact 120 along the second direction, the space occupied by the vacuum circuit breaker along the axial direction can be saved.

[0050] See also Figure 1 and Figure 2 As shown, in some embodiments, the vacuum circuit breaker further includes a transmission mechanism 300, and the transmission mechanism 300 is connected between the output end of the hydraulic mechanism 200 and the moving contact 120 to transmit the driving force of the hydraulic mechanism 200 to the moving contact 120. Since the moving contact 120 and the static contact 110 are arranged in the vacuum interrupter of the vacuum circuit breaker, by providing the transmission mechanism 300, the moving contact 120 and the hydraulic mechanism 200 which are far apart can be connected, so that the hydraulic pressure output by the hydraulic mechanism 200 is transmitted to the moving contact 120, so as to drive the moving contact 120 to move along the first direction.

[0051] In some embodiments, the transmission mechanism 300 includes a first transmission rod 310, at least a portion of which is arranged along the second direction Y, one end of the first transmission rod 310 is connected to the output end of the hydraulic mechanism 200, and the other end is connected to the moving contact 120. Through the first transmission rod 310, the hydraulic pressure output by the hydraulic mechanism 200 is transmitted to the moving contact 120 to drive the moving contact 120 to move. In some embodiments, the first transmission rod 310 may be L-shaped, and when the output end of the hydraulic mechanism 200 moves upward, the first transmission rod 310 moves upward synchronously, thereby causing the moving contact 120 to move upward synchronously.

[0052] See also Figure 1 and Figure 2As shown, in one embodiment, the first transmission rod 310 is arranged along the second direction, for example, the first transmission rod 310 is in a straight line, and the transmission mechanism 300 further includes a first transmission assembly 320, one end of the first transmission assembly 320 is rotatably connected to the output end of the hydraulic mechanism 200, and the other end of the first transmission assembly 320 is rotatably connected to the first transmission rod 310. By providing the first transmission assembly 320, the movement of the output end of the hydraulic mechanism 200 along the first direction X can be converted into the movement of the first transmission rod 310 along the second direction Y.

[0053] See also Figure 1 and Figure 2 As shown, in one embodiment, the first transmission assembly 320 includes a first swinging member 321 and a second swinging member 322 which is arranged at an angle to the first swinging member 321 and is fixedly connected; one end of the first swinging member 321 away from the second swinging member 322 is rotatably connected to the output end of the hydraulic mechanism 200, and one end of the second swinging member 322 away from the first swinging member 321 is connected to one end of the first transmission rod 310 away from the moving contact 120. For example, Figure 2 In the illustrated embodiment, taking the hydraulic mechanism 200 including the piston rod 220 as an example, when the piston rod 220 moves upward relative to the hydraulic cylinder 210, the first swinging member 321 swings clockwise, and since the first swinging member 321 and the second swinging member 322 are fixedly connected, that is, the angle between the two is fixed, the second swinging member 322 is driven to swing clockwise, thereby driving the first transmission rod 310 to move rightward. Conversely, when the piston rod 220 moves downward, the first swinging member 321 is driven to rotate counterclockwise, and the second swinging member 322 is synchronously rotated counterclockwise, thereby driving the first transmission rod 310 to move leftward.

[0054] In other embodiments, the first transmission assembly may include two bevel blocks, which are matched through bevel surfaces, one of which is connected to the piston rod, and the other is connected to the first transmission rod. When the piston rod drives one of the bevel blocks to move upward, the other bevel block can move right along the second direction with the cooperation of the bevel surface, thereby driving the first transmission rod to move right to achieve force transmission.

[0055] See also Figure 1 and Figure 2 As shown, in one embodiment, the transmission mechanism 300 further includes a second transmission assembly 330, one end of the second transmission assembly 330 is rotatably connected to one end of the first transmission rod 310 away from the hydraulic mechanism 200, and the other end of the second transmission assembly 330 is rotatably connected to the moving contact 120; the second transmission assembly 330 is used to convert the movement of the first transmission rod 310 along the second direction Y into the movement of the moving contact 120 along the first direction X. By providing the second transmission assembly 330, the movement of the first transmission rod 310 along the second direction Y can be converted into the movement of the moving contact 120 along the first direction X.

[0056] See also Figure 1 and Figure 2 As shown, in one embodiment, the second transmission assembly 330 includes a third swinging member 331 and a fourth swinging member 332 which is arranged at an angle to and fixedly connected to the third swinging member 331; one end of the third swinging member 331 away from the fourth swinging member 332 is rotatably connected to one end of the first transmission rod 310 away from the hydraulic mechanism 200, and one end of the fourth swinging member 332 away from the third swinging member 331 is rotatably connected to the moving contact 120.

[0057] For example, Figure 2 In the illustrated embodiment, taking the hydraulic mechanism 200 including the piston rod 220 as an example, when the piston rod 220 moves upward relative to the hydraulic cylinder 210, the first swinging member 321 swings clockwise. Since the first swinging member 321 and the second swinging member 322 are fixedly connected, that is, the angle between the two is fixed, the second swinging member 322 is driven to swing clockwise, thereby driving the first transmission rod 310 to move rightward. When the first transmission rod 310 moves rightward, the third swinging member 331 is driven to swing counterclockwise, and the fourth swinging member 332 rotates counterclockwise synchronously with the third swinging member 331, so that the end of the fourth swinging member 332 connected to the moving contact 120 (which may be directly connected or indirectly connected) moves downward, thereby driving the moving contact 120 away from the static contact 110. Conversely, when the piston rod 220 moves downward, the first swinging member 321 is driven to rotate counterclockwise, and the second swinging member 322 is synchronously rotated counterclockwise, thereby driving the first transmission rod 310 to move leftward. When the first transmission rod 310 moves left, it drives the third swinging member 331 to swing clockwise, and the fourth swinging member 332 rotates clockwise synchronously with the third swinging member 331, so that the end of the fourth swinging member 332 connected to the moving contact 120 moves upward, thereby driving the moving contact 120 to move closer to the static contact 110.

[0058] like Figure 1 As shown, in some embodiments, a second transmission rod 130 is disposed between the fourth swing member 332 and the moving contact 120, the fourth swing member 332 is rotatably connected to the second transmission rod 130, and the moving contact 120 is fixedly connected to the second transmission rod 130. Correspondingly, the second transmission rod 130 is driven to move up or down by the transmission mechanism 300 to achieve contact or separation between the moving contact 120 and the stationary contact 110.

[0059] like Figure 1As shown, in some embodiments, the vacuum circuit breaker further includes a moving conductive rod 140 connected to the moving contact 120. In some embodiments, the vacuum circuit breaker further includes a moving pull rod 150 connected to one end of the moving conductive rod 140 away from the moving contact 120. The moving conductive rod 140 is a conductor, and the moving pull rod 150 is an insulator. The moving pull rod 150 and the moving conductive rod 140 can move along the first direction X, thereby controlling the moving contact 120 to move along the first direction X, so as to achieve the closing and opening operations of the vacuum circuit breaker. Specifically, by controlling the moving pull rod 150 to move in the direction in which the moving contact 120 points to the static contact 110, the moving contact 120 moves in the direction close to the static contact 110 until it moves to the closing position, so as to achieve the closing operation. Controlling the moving pull rod 150 to move in the direction in which the static contact 110 points to the moving contact 120, the moving contact 120 moves in the direction away from the static contact 110 until it moves to the opening position, so as to achieve the opening operation. In some embodiments, the vacuum circuit breaker further includes a moving end support member, which is cylindrical and provides support force for the moving conductive rod 140 and the moving pull rod 150 .

[0060] like Figure 1 As shown, in some embodiments, the vacuum circuit breaker further includes a static conductive rod 160 connected to the static contact 110. In some embodiments, the vacuum circuit breaker further includes a vacuum interrupter housing, the static contact 110 and the moving contact 120 are located in the vacuum interrupter housing, and the static conductive rod 160 and the moving conductive rod 140 are both partially located in the vacuum interrupter housing.

[0061] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A vacuum circuit breaker, characterized in that: The vacuum circuit breaker comprises: Stationary contact (110); A moving contact (120) is arranged along a first direction with the stationary contact (110); when the vacuum circuit breaker is in a closed state, the moving contact (120) is in conductive contact with the stationary contact (110); when the vacuum circuit breaker is in an open state, the moving contact (120) is disconnected from the stationary contact (110); A hydraulic mechanism (200), wherein in the closed state, an output end of the hydraulic mechanism (200) is connected to the moving contact (120) to provide the moving contact (120) with a holding force in a direction from the moving contact (120) to the stationary contact (110), and the holding force is greater than the electric force of the moving contact (120).

2. The vacuum circuit breaker according to claim 1, characterized in that: The output end of the hydraulic mechanism (200) is connected to the moving contact (120), and the hydraulic mechanism (200) is used to drive the moving contact (120) to move closer to or farther away from the static contact (110) so as to switch between the closing state and the opening state.

3. The vacuum circuit breaker according to claim 2, characterized in that: The hydraulic mechanism (200) comprises: A hydraulic cylinder (210), wherein the hydraulic cylinder (210) is slidably connected to a piston rod (220), and the piston rod (220) is connected to the moving contact (120); A hydraulic pump (230) is connected to the hydraulic cylinder (210), and the hydraulic pump (230) is used to pump liquid into the hydraulic cylinder (210) to drive the piston rod (220) to move along the first direction.

4. The vacuum circuit breaker according to claim 3, characterized in that: The hydraulic cylinder (210) is provided with liquid interfaces (211) at both ends along the first direction, and a liquid circuit (260) is connected between the liquid interface (211) and the hydraulic pump (230); The liquid circuit (260) is connected to a pressure control unit (250).

5. The vacuum circuit breaker according to claim 4, characterized in that: The vacuum circuit breaker further comprises a three-way pipe (240), two connection interfaces of the three-way pipe (240) being respectively connected to the two liquid circuits (260), and the other connection interface of the three-way pipe (240) being connected to the pressure control unit (250).

6. The vacuum circuit breaker according to any one of claims 1 to 5, characterized in that: The hydraulic mechanism (200) is arranged on one side of the moving contact (120) along a second direction, and the second direction is perpendicular to the first direction; The vacuum circuit breaker further comprises a transmission mechanism (300), wherein the transmission mechanism (300) is connected between an output end of the hydraulic mechanism (200) and the moving contact (120) so as to transmit the driving force of the hydraulic mechanism (200) to the moving contact (120).

7. The vacuum circuit breaker according to claim 6, characterized in that: The transmission mechanism (300) comprises a first transmission rod (310), at least a portion of the first transmission rod (310) being arranged along the second direction, one end of the first transmission rod (310) being connected to an output end of the hydraulic mechanism (200), and the other end being connected to the moving contact (120).

8. The vacuum circuit breaker according to claim 7, characterized in that: The transmission mechanism (300) further comprises a first transmission assembly (320), one end of the first transmission assembly (320) being rotationally connected to the output end of the hydraulic mechanism (200), and the other end of the first transmission assembly (320) being rotationally connected to the first transmission rod (310); The first transmission assembly (320) is used to convert the movement of the output end of the hydraulic mechanism (200) along the first direction into the movement of the first transmission rod (310) along the second direction.

9. The vacuum circuit breaker according to claim 8, characterized in that: The transmission mechanism (300) further comprises a second transmission assembly (330), one end of the second transmission assembly (330) being rotationally connected to an end of the first transmission rod (310) away from the hydraulic mechanism (200), and the other end of the second transmission assembly (330) being rotationally connected to the moving contact (120); The second transmission assembly (330) is used to convert the movement of the first transmission rod (310) along the second direction into the movement of the moving contact (120) along the first direction.

10. The vacuum circuit breaker according to claim 9, characterized in that: The first transmission assembly (320) comprises a first swinging member (321) and a second swinging member (322) which is arranged at an angle to the first swinging member (321) and is fixedly connected; one end of the first swinging member (321) away from the second swinging member (322) is rotationally connected to the output end of the hydraulic mechanism (200), and one end of the second swinging member (322) away from the first swinging member (321) is connected to one end of the first transmission rod (310) away from the moving contact (120); and / or, The second transmission assembly (330) comprises a third swinging member (331) and a fourth swinging member (332) arranged at an angle to and fixedly connected to the third swinging member (331); an end of the third swinging member (331) away from the fourth swinging member (332) is rotationally connected to an end of the first transmission rod (310) away from the hydraulic mechanism (200), and an end of the fourth swinging member (332) away from the third swinging member (331) is rotationally connected to the moving contact (120).

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