High speed two position three way hydraulic valve

Abstract

The present invention belongs to the technical field of hydraulic operating mechanism of high-voltage circuit breaker, and relates to a high-speed two-position three-way valve, comprising a main valve body and a pilot valve body connected to each other; a main valve core is provided in a sliding manner in the main valve body, and the limit position of the axial movement of the main valve core is limited by a cone valve, and outer cones are provided at both axial ends of the main valve body, and the outer cones are correspondingly matched with inner cones provided at both axial ends of the inner cavity of the main valve body; the main valve core is a hollow structure, and a pilot valve is installed at one end of the main valve core close to the oil inlet, and a damping oil hole is provided between the working oil port of the main valve core and the control oil cavity of the pilot valve, and the main valve body is also provided with an oil inlet and an oil return port connected to the hollow cavity of the main valve core, and a working oil port is provided at the axial outer end of the main valve body, and the working oil port is connected to the hollow cavity of the main valve core. The two-position three-way valve can meet various working requirements of the hydraulic operating mechanism of the circuit breaker.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic operating mechanisms of high-voltage circuit breakers and relates to a high-speed two-position three-way valve. Background Art

[0002] Sulfur hexafluoride high-voltage circuit breakers are often used in high-voltage power transmission systems to open and close loaded transmission lines. The contacts sealed in sulfur hexafluoride gas require a high-speed operating mechanism to control the opening and closing of the contacts. The hydraulic transmission method has a very fast response and is undoubtedly the best choice for the operating mechanism. Since the speed of contact opening and closing is extremely high, especially during the opening operation, the operating mechanism must separate the contacts in about 20ms, so the instantaneous flow rate of the fluid in the hydraulic operating mechanism is extremely high.

[0003] Since the high-voltage circuit breaker does not work frequently, in order to reduce energy consumption, it is hoped that the pressure oil stored in the accumulator will not leak as much as possible when it is not working.

[0004] To ensure the safety of high-voltage circuit breakers, their open or closed states must be stable and reliable. Even in the event of power failure or voltage loss, the operating mechanism can still reliably maintain the open or closed state.

[0005] The above high speed, large flow, no leakage and bistable state are the requirements of the hydraulic operating mechanism for the control valve. Summary of the invention

[0006] In view of the above problems, the present invention provides a high-speed two-position three-way valve, which can meet various working requirements of the hydraulic operating mechanism of the circuit breaker.

[0007] According to the technical solution of the present invention: a high-speed two-position three-way valve is characterized by comprising a main valve body, a pilot valve body and a high-speed non-leakage pilot solenoid valve integrated on the pilot valve body which are connected to each other in a coordinated manner;

[0008] A main valve core with a hollow structure is provided in the main valve body for sliding cooperation, one axial end of the main valve core and the axial end corresponding to the main valve body form an oil inlet cone valve, and the other axial end of the main valve core and the axial end corresponding to the main valve body form an oil return cone valve;

[0009] An oil inlet, an oil return port and a working oil port are arranged on the main valve body, and the oil inlet cone valve and the oil return cone valve connect the oil inlet or the oil outlet with the working oil port.

[0010] The main valve core is provided with outer cones at both axial ends, and the main valve body is provided with inner cones at both axial ends. The inner cone at one axial end of the main valve body and the outer cone at the same axial end of the main valve core constitute an oil inlet cone valve, and the inner cone at the other axial end of the main valve body and the outer cone at the same axial end of the main valve core constitute an oil return cone valve.

[0011] A pilot valve is installed at one end of the main valve core close to the oil inlet, and a damping oil hole is arranged between the working oil port of the main valve core and the control oil chamber of the pilot valve. The pilot valve core extends into the inner hole of the pilot valve body and is connected to the main valve core. A control oil port is arranged on the pilot valve body to connect to the control oil chamber of the pilot valve body.

[0012] A first protrusion and a second protrusion are arranged on the inner wall of the main valve body, and a boss is arranged on the outer surface of the main valve core. The boss is placed between the first protrusion and the second protrusion, and a first oil chamber and a second oil chamber are formed between the boss and the protrusion. The first oil chamber is connected to the oil inlet, and the second oil chamber is connected to the oil return port.

[0013] The pilot valve body is also provided with a damping hole, and the damping hole is connected with the working oil port and the control oil port.

[0014] The inner hole of the pilot valve body is provided with an installation groove, and the spring positioning device is arranged in the installation groove. The surface of the pilot valve is provided with a groove, and the groove cooperates with the spring positioning device so that in the pressure-loss state, the pilot valve can still be in the open or closed position. A sealing ring is arranged on the side close to the main valve core, and the sealing ring is sealed and cooperated with the inner hole of the pilot valve body.

[0015] The high-speed leakage-free solenoid valve also includes a gate-opening pilot solenoid valve and a gate-closing pilot solenoid valve, the oil outlets of the gate-opening pilot solenoid valve and the gate-closing pilot solenoid valve are respectively connected to the pilot valve control oil port, the oil inlet of the gate-opening pilot solenoid valve is connected to the oil return port, and the oil inlet of the gate-closing pilot solenoid valve is connected to the oil inlet.

[0016] The technical effect of the present invention is that the two-position three-way valve of the present invention can perfectly meet various working requirements of the hydraulic operating mechanism of the circuit breaker, has no leakage when not working, can ensure the safe and reliable opening and closing operation of the high-voltage circuit breaker when working, and the opening state or the closing state is stable and reliable. Even in the power-off or pressure-off state, the operating mechanism can still reliably maintain the opening state or the closing state. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structural principle of the present invention.

[0018] Figure 2 It is a schematic diagram of the closing state of the present invention.

[0019] Figure 3 It is a schematic diagram of the opening state of the present invention.

[0020] Figure 4 It is a schematic diagram of the working state of the present invention. DETAILED DESCRIPTION

[0021] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figures 1 to 4 It includes a main valve core 1, an oil hole 1-1, a boss 1-2, a main valve body 2, a first protrusion 2-1, a second protrusion 2-2, a first oil chamber 2-3, a second oil chamber 2-4, a pilot valve 3, a groove 3-1, a pilot valve body 4, a damping hole 5, a spring positioning device 6, a gate-opening pilot solenoid valve 7, an oil circuit 8, a gate-closing pilot solenoid valve 9, a single-acting operating cylinder 10, an accumulator 11, a one-way valve 12, a high-pressure pump 13, etc.

[0023] like Figures 1 to 4 As shown, the present invention is a high-speed two-position three-way valve, comprising a main valve body 2, a pilot valve body 4 and a high-speed non-leakage pilot solenoid valve integrated on the pilot valve body;

[0024] A main valve core 1 with a hollow structure is provided in a sliding cooperation with the main valve body 2, one axial end of the main valve core 1 and the axial end corresponding to the main valve body 2 form an oil inlet cone valve, and the other axial end of the main valve core 1 and the axial end corresponding to the main valve body 2 form an oil return cone valve;

[0025] The main valve body 2 is provided with an oil inlet P, an oil return port T and a working oil port A. The oil inlet cone valve and the oil return cone valve connect the oil inlet P or the oil outlet T with the working oil port A.

[0026] Outer cones are respectively provided at both axial ends of the main valve core 1, and inner cones are respectively provided at both axial ends of the main valve body 2. The inner cone at one axial end of the main valve body 2 and the outer cone at the same axial end of the main valve core 1 constitute an oil inlet cone valve, and the inner cone at the other axial end of the main valve body 2 and the outer cone at the same axial end of the main valve core 1 constitute an oil return cone valve.

[0027] A pilot valve 3 is installed at one end of the main valve core 1 close to the oil inlet P, and a damping oil hole 1-1 is arranged between the working oil port A of the main valve core 1 and the control oil chamber of the pilot valve 3. The pilot valve core 3 extends into the inner hole of the pilot valve body 4 and is connected to the main valve core 1. A control oil port C is arranged on the pilot valve body 4 to connect with the control oil chamber of the pilot valve body 4.

[0028] The inner wall of the main valve body 2 is provided with a first protrusion 2-1 and a second protrusion 2-2, and the outer surface of the main valve core 1 is provided with a boss 1-2, and the boss 1-2 is placed between the first protrusion 2-1 and the second protrusion 2-2, and a first oil chamber 2-3 and a second oil chamber 2-4 are formed between the boss and the protrusion. The first oil chamber 2-3 is connected to the oil inlet P, and the second oil chamber 2-4 is connected to the oil return port T.

[0029] A damping hole 5 is also provided on the pilot valve body 4 , and the damping hole 5 is connected with the working oil port A and the control oil port C.

[0030] The inner hole of the pilot valve body 4 is provided with a mounting groove, and the spring positioning device 6 is arranged in the mounting groove. The surface of the pilot valve 3 is provided with a groove 3-3, and the groove 3-3 cooperates with the spring positioning device 6. In the pressure-loss state, the pilot valve 3 can still be in the open or closed position. A sealing ring is arranged on the side close to the main valve core 1, and the sealing ring is sealed with the inner hole of the pilot valve body 4.

[0031] The high-speed leakage-free solenoid valve also includes an opening pilot solenoid valve 7 and a closing pilot solenoid valve 9, the oil outlets of the opening pilot solenoid valve 7 and the closing pilot solenoid valve 9 are respectively connected to the control oil port C, the oil inlet of the opening pilot solenoid valve 7 is connected to the oil return port T, and the oil inlet of the closing pilot solenoid valve 9 is connected to the oil inlet P.

[0032] The working principle of the product of the present invention is as follows: the three-way valve has an oil inlet P, an oil return port T, a working oil port A and a control oil port C. Figure 1 As shown, there is a hollow main valve core 1 in the valve body 2, and both ends of the hollow main valve core 1 are leak-free cone valve structures. There is a boss 1-2 in the middle of the valve core 1, and the pressure area of ​​the boss 1-2 is a1, which is connected to the oil inlet P. The main valve core is always subjected to a force in the direction of the pilot valve 3. The control oil chamber of the pilot valve 3 has a pressure area a2, where a2=2a1. When the pilot valve 3 is not subjected to force, the main valve core 1 moves in the direction of the pilot valve, closing the passage between the oil inlet P and the working oil port A, and communicating the working oil port A with the return oil port T. When the pilot valve 3 is subjected to force, the pilot valve 3 overcomes the force acting on the main valve core 1, and pushes the main valve core 1 to move in the opposite direction, so that the oil inlet P communicates with the working oil port A, and closing the passage between the working oil port A and the return oil port T;

[0033] A pilot valve 3 is connected to the main valve 1, and the pilot valve 3 slides in the pilot valve body 4. The opening pilot solenoid valve 7, the oil circuit 8, and the closing pilot solenoid valve 9 integrated on the pilot valve 3 constitute an external control oil circuit.

[0034] Closing status Figure 2 As shown: when the closing pilot solenoid valve 7 is energized, the control oil port C is connected to the oil inlet P, the thrust of the pilot valve 3 overcomes the thrust of the main valve core 1, and moves in the closing direction together with the main valve core 1, closing the passage between the working oil port A and the return oil port T, and the pressure oil is connected to the working oil port A through the oil inlet P and the hollow main valve core 1.

[0035] The opening state is Figure 3 As shown: when the opening pilot solenoid valve 7 is energized, the control oil port C is connected to the return oil port T. Under the action of the main valve 1, the main valve 1 together with the pilot valve 3 moves in the opening direction, connecting the working oil port A and the return oil port T, and closing the passage between the oil inlet port P and the working oil port A.

[0036] In the closed state, the damping hole 5 connects the oil pressure of the working oil port A to the control oil chamber of the pilot valve body 4, forming positive feedback. Even if the closing pilot solenoid valve 9 of the control oil port C loses power and the control oil pressure disappears, as long as the control oil port C is still in the closed state, the position of the main valve core 1 will not move and it will be in a stable closed state. Similarly, when the main valve core 1 is in the open state, the damping hole 5 can also maintain a stable open state.

[0037] A mechanical spring positioning device 6 is also installed on the pilot valve. Even if the external oil pressure P is completely interrupted, the position of the valve core will not change due to the spring positioning device 6. Only the oil pressure pulse of the control oil port C can change the state of the valve core. The mechanical spring positioning device 6 adopts a cylindrical helical spring and is set in the groove of the pilot valve body 4.

[0038] The specific use scheme of the product of the present invention in the hydraulic operating mechanism is as follows: Figure 4 As shown, the working oil port A is connected to the single-acting operating cylinder 10 of the operating mechanism, and the piston rod of the single-acting operating cylinder 10 is connected to the electrical contacts of the high-voltage switch. A high-pressure oil pump inputs oil into the accumulator 11. The high-pressure hydraulic oil stored in the accumulator 11 is enough to make the single-acting cylinder of the operating mechanism reciprocate more than once. When the control valve is stationary, the high-pressure hydraulic oil stored in the accumulator does not lose because the sealing surface of the cone valve has no leakage. When the external command controls the opening and closing of the pilot valve, the high-pressure oil stored in the accumulator quickly rushes into the cylinder, causing the electrical contacts to open and close at high speed.

[0039] When the closing pilot solenoid valve 9 is turned on, the pressure oil stored in the accumulator enters the pilot valve body 4 through the closing pilot solenoid valve 9, pushing the pilot valve 3 and the main valve core 1 into the closing state. The high-pressure oil stored in the accumulator quickly rushes into the operating cylinder through the hollow main valve core 1, pushing the cylinder piston rod to extend quickly, so that the electrical contacts connected to the piston rod are closed. Due to the damping hole 5 in the pilot valve body 4, the control oil port C is connected to the working oil port A. Even if the closing pilot solenoid valve 9 loses power, the operating cylinder can still reliably remain in the closing state.

[0040] In the closed state of the operating mechanism, as long as the opening pilot solenoid valve 7 is connected, the oil pressure in the pilot valve body 4 will be discharged into the oil tank through the opening pilot solenoid valve 7, and the pilot valve core 3 will be pushed to the opening oil return state by the main valve core 1, so that the working oil port A is connected to the oil return port T, and the oil in the rodless chamber of the operating cylinder is rapidly discharged into the oil tank, so that the piston rod is retracted very quickly, and the electrical contact is disconnected at a high speed. Since the damping hole 5 in the pilot valve body 4 connects the control oil port C with the working oil port A, even if the opening pilot solenoid valve 7 loses power, the single-acting operating cylinder 10 can still reliably remain in the open state.

Claims

1. A high-speed two-position three-way valve, characterized in that: It comprises a main valve body (2), a pilot valve body (4) which are connected to each other in a coordinated manner, and a high-speed non-leakage pilot solenoid valve integrated on the pilot valve body; A main valve core (1) with a hollow structure is slidably arranged in the main valve body (2); one axial end of the main valve core (1) and an axial end portion corresponding to the main valve body (2) form an oil inlet cone valve; and the other axial end of the main valve core (1) and an axial end portion corresponding to the main valve body (2) form an oil return cone valve; An oil inlet (P), an oil return port (T) and a working oil port (A) are provided on the main valve body (2); the oil inlet cone valve and the oil return cone valve connect the oil inlet (P) or the oil return port (T) with the working oil port (A); A pilot valve (3) is installed at one end of the main valve core (1) close to the oil inlet (P); a damping oil hole (1-1) is provided between the working oil port (A) of the main valve core (1) and the control oil chamber of the pilot valve (3); the valve core of the pilot valve (3) extends into the inner hole of the pilot valve body (4) and is connected to the main valve core (1); and a control oil port (C) is provided on the pilot valve body (4) to communicate with the control oil chamber of the pilot valve body (4); The pilot valve body (4) is also provided with a damping hole (5), and the damping hole (5) is connected to the working oil port (A) and the control oil port (C); The main valve core (1) is provided with outer cones at both axial ends, and the main valve body (2) is provided with inner cones at both axial ends. The inner cone at one axial end of the main valve body (2) and the outer cone at the same axial end of the main valve core (1) form an oil inlet cone valve, and the inner cone at the other axial end of the main valve body (2) and the outer cone at the same axial end of the main valve core (1) form an oil return cone valve. The inner wall of the main valve body (2) is provided with a first protrusion (2-1) and a second protrusion (2-2); the outer surface of the main valve core (1) is provided with a boss (1-2); the boss (1-2) is disposed between the first protrusion (2-1) and the second protrusion (2-2); a first oil chamber (2-3) and a second oil chamber (2-4) are formed between the boss and the protrusion; the first oil chamber (2-3) is connected to an oil inlet (P), and the second oil chamber (2-4) is connected to an oil return port (T).

2. The high-speed two-position three-way valve according to claim 1, characterized in that: The inner hole of the pilot valve body (4) is provided with a mounting groove, and the spring positioning device (6) is arranged in the mounting groove. The surface of the pilot valve (3) is provided with a groove (3-3), and the groove (3-3) cooperates with the spring positioning device (6). In the depressurized state, the pilot valve (3) can still be in the open or closed position. A sealing ring is provided on the side close to the main valve core (1), and the sealing ring is sealed and cooperated with the inner hole of the pilot valve body (4).

3. The high-speed two-position three-way valve according to claim 1, characterized in that: The high-speed non-leakage solenoid valve comprises an opening pilot solenoid valve (7) and a closing pilot solenoid valve (9), wherein the oil outlets of the opening pilot solenoid valve (7) and the closing pilot solenoid valve (9) are respectively connected to a control oil port (C), the oil inlet of the opening pilot solenoid valve (7) is connected to an oil return port (T), and the oil inlet of the closing pilot solenoid valve (9) is connected to an oil inlet port (P).

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