Control valve of rapid hydraulic operating mechanism

Abstract

The utility model relates to a quick hydraulic operating mechanism control valve, which comprises a control valve assembly and an electromagnetic repulsion tripping device, the control valve assembly comprises a valve seat and a valve core, and the valve seat is provided with a low-pressure oil port, a variable oil port and a high-pressure oil port which are arranged along the moving direction of the valve core. The electromagnetic repulsion tripping device comprises a tripping device frame body and a connecting rod connected in the tripping device frame body in a sliding mode, a main repulsion disc and an auxiliary repulsion disc are fixedly connected to the connecting rod, a main branch coil, a closing coil and an auxiliary branch coil are fixedly connected to the tripping device frame body, and the connecting rod is coaxially connected with the valve element. Compared with a conventional circuit breaker, the circuit breaker provided by the utility model has stronger applicability in a converter transformer inlet wire switch application scene, the on-off time is shortened to be within 25ms from the original 50ms, a fault can be quickly cleared, and the circuit breaker is suitable for quickly clearing an anti-deflagration fault of an extra-high voltage converter transformer.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, specifically point to a kind of quick hydraulic operating mechanism control valve. BACKGROUND

[0002] With the expansion of power system scale and the rapid growth of power grid system load, the short-circuit current of power system increases year by year, and large short-circuit current has threatened the safe operation of power grid equipment. In order to quickly remove the fault short-circuit current and better protect the power grid equipment, in recent years, the quick circuit breaker has become the focus of attention and research in the industry. High-voltage and ultra-high-voltage quick circuit breakers need to be matched with high-power quick hydraulic operating mechanisms, and the research and development of quick control valves is the key to realizing the quick action function of the operating mechanism.

[0003] The opening time of conventional high-voltage circuit breakers is generally about 20 milliseconds, and the opening time of new quick circuit breakers needs to be shortened to a few milliseconds. The opening time can be divided into two parts: the control action time of the operating mechanism and the opening time of the circuit breaker movement. Due to the large movement quality of high-voltage and ultra-high-voltage circuit breakers, the operation power itself is very large, and the opening time shortened by increasing the opening speed is relatively small, so it is more critical to shorten the control action time of the operating mechanism. The conventional control valve generally uses a solenoid valve for control, and the action time is relatively long. For example, the invention disclosed in the patent with the publication number CN112820576A can realize quick action, but due to the limitation of oil flow speed and the power of the driving module, the action time cannot be greatly improved. If the time needs to be greatly shortened, a new quick action control valve must be designed. SUMMARY

[0004] The utility model provides a kind of quick hydraulic operating mechanism control valve for the deficiency of prior art, solve the problem that existing conventional circuit breaker exists that electromagnet responds slowly, action time is long, and opening speed is limited.

[0005] The utility model is realized by the following technical scheme, provide a kind of quick hydraulic operating mechanism control valve, including control valve assembly and electromagnetic repulsion force tripping device, the control valve assembly includes valve seat and valve core, the electromagnetic repulsion force tripping device includes tripping device frame body and the connecting rod slidingly connected in tripping device frame body, the connecting rod is coaxially connected with valve core.

[0006] As optimization, the valve seat is opened with low-pressure oil port, variable oil port and high-pressure oil port arranged along the moving direction of valve core, the valve seat is fixedly connected with right valve core seat, the valve core is fixedly connected with A1 piston, A1 piston right side forms A1 cavity with right valve core seat, and the valve seat is opened with through-flow oil channel communicating A1 cavity and variable oil port.

[0007] As optimization, a large-flow one-way valve which opens in the direction of the A1 cavity is communicated between the A1 cavity and the variable oil port.

[0008] As optimization, a left valve core seat is fixed in the valve seat, and an A3 piston and an A2 piston are further fixed on the valve core, the left side of the A3 piston and the left valve core seat form an A3 cavity, the right side of the A2 piston is communicated with the left side of the A3 piston through a communication hole, the right side of the A2 piston and the right valve core seat form an A2 cavity in the open state, the A2 cavity is communicated with the high-pressure oil port, the pressure receiving cross-sectional areas of the A3 piston, the A2 piston and the A1 piston are S3, S2 and S1 respectively, and S1

[0009] As optimization, a plurality of through-flow oil channels are arranged circumferentially.

[0010] As optimization, a main repulsion disc and a secondary repulsion disc are fixed on the connecting rod, a main split coil, a closing coil and a secondary split coil matched with the secondary repulsion disc are fixed on the tripping device frame body, and the main repulsion disc is located between the main split coil and the closing coil.

[0011] As optimization, the electromagnetic repulsion tripping device further comprises a plurality of oil buffers arranged circumferentially along the connecting rod, and the oil buffers are arranged on the side, away from the secondary split coil, of the secondary repulsion disc.

[0012] As optimization, a connecting piece is connected between the connecting rod and the valve core, and the electromagnetic repulsion tripping device further comprises a bistable holding structure, the bistable holding structure comprises a plurality of sliding blocks arranged circumferentially along the connecting rod, the sliding blocks are slid along the connecting rod and are connected with the connecting piece through a pull plate, and the spring seat is provided with a holding spring for driving the sliding blocks to move towards the connecting piece.

[0013] The utility model discloses the beneficial effects are:

[0014] Compared with the conventional circuit breaker, the fast circuit breaker has strong applicability in the application scene of the converter transformer line switch, the breaking time of the fast circuit breaker is shortened from the original 50ms to within 25ms, the fault can be quickly cleared, and the fast circuit breaker is suitable for quickly clearing the explosion-proof fault of the extra-high voltage converter transformer. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the open state schematic drawing of the utility model;

[0016] Figure 2 It is the open state schematic drawing of the utility model;

[0017] Figure 3The utility model discloses a control valve assembly cross section view of closing state

[0018] Figure 4 The utility model discloses Figure 3 A-A plane cross section view

[0019] Figure 5 The utility model discloses right valve core seat cross section view

[0020] Figure 6 The utility model discloses valve core schematic diagram

[0021] Figure 7 The utility model discloses Figure 3 Top view

[0022] Figure 8 The utility model discloses Figure 8 B-B plane cross section view

[0023] Figure 9 The utility model discloses large flow check valve cross section view

[0024] Figure 10 The utility model discloses electromagnetic repulsion tripping device cross section view

[0025] Figure 11 The utility model discloses bistable holding structure cross section view

[0026] As shown in the figure:

[0027] 1, control valve assembly, 2, electromagnetic repulsion tripping device, 3, valve seat, 4, left pressing plate, 5, right pressing plate, 6, right valve core seat, 6-1, through oil channel, 6-2, communication hole, 6-3, high pressure oil port communication port, 7, left valve core seat, 8, valve core, 8-1, small valve core, 8-2, big valve core, 8-3, A1 piston, 8-4, A2 piston, 8-5, A3 piston, 9, large flow check valve, 9-1, check valve seat, 9-2, valve piece, 9-3, reset spring, 9-4, valve sleeve, 10, sealing plug, 11, opening flow valve core, 12, flow valve core seat, 13, closing flow valve core, 14, nut, 15, bistable holding structure, 15-1, spring pressing plate, 15-2, spring seat, 15-3, pull plate, 15-4, sliding block, 15-5, holding spring, 16, connecting piece, 17, connecting rod, 18, first guide seat, 19, support rod, 20, first guide seat pressing plate, 21, main branch coil, 22, main repulsion disc, 23, closing coil, 24, cover, 25, vice branch coil, 26, vice repulsion disc, 27, second guide seat pressing plate, 28, oil buffer, 29, spacer sleeve, 30, guide sleeve, 32, second guide seat, 33, round nut, 34, oil buffer turnover plug, 35, positioning screw, T, low pressure oil port, P, high pressure oil port, Z, variable oil port. DETAILED DESCRIPTION

[0028] In order to clearly illustrate the technical features of the scheme, the scheme will be described below through specific embodiments.

[0029] As shown in Figures 1-11 The utility model discloses a quick hydraulic operating mechanism control valve, including control valve subassembly 1 and electromagnetic repulsion tripping device 2.

[0030] As shown in Figures 3-9 The control valve subassembly 1 includes valve seat 3 and valve core 8, the valve seat 3 is opened and is arranged low pressure oil port T, variable oil port Z and high pressure oil port P along the direction of movement of valve core 8, as shown in Figure 7 In the embodiment, low pressure oil port T and variable oil port Z are on a straight line, and high pressure oil port P is arranged in a staggered manner.

[0031] The left and right sides of valve seat 3 are bolted with left pressure plate 4 and right pressure plate 5 respectively, and the valve core can be a split structure or a whole structure, for easy processing, preferably a split structure, as shown in Figure 6 In the embodiment, valve core 8 is composed of small valve core 8-1 and large valve core 8-2.

[0032] The valve seat 3 is fixedly connected with right valve core seat 6 and left valve core seat 7, the valve core 8 is fixedly connected with A1 piston 8-3, A2 piston 8-4 and A3 piston 8-5 arranged from right to left, A1 cavity is formed by A1 piston 8-3 right side and right valve core seat 6, A3 cavity is formed by A3 piston 8-5 left side and left valve core seat 7, A2 piston 8-4 right side and A3 piston 8-5 left side are communicated through the communication hole, A2 cavity is formed by A2 piston 8-4 right side and right valve core seat 6 in the open state, and the A2 cavity is communicated with high pressure oil port P, the pressure receiving cross-sectional areas of A3 piston 8-5, A2 piston 8-4 and A1 piston 8-3 are S3, S2 and S1 respectively, and S1 < S2 < S3, S1 + S2 > S3.

[0033] The pressure receiving cross-sectional areas of A3 piston 8-5, A2 piston 8-4 and A1 piston 8-3 are S3, S2 and S1 respectively, since A3 piston 8-5 is completely inserted into the inner hole of left valve core seat 7, the pressure receiving cross-sectional area of A3 piston 8-5 is also the outer diameter cross-sectional area of A3 piston 8-5, since A2 piston 8-4 right end is inserted into the left end opening of right valve core seat 6, the pressure receiving cross-sectional area of A2 piston 8-4 refers to the outer diameter cross-sectional area of the right end insertion part of A2 piston 8-4 minus the cross-sectional area of A1 piston 8-3, and the pressure receiving cross-sectional area of A1 piston 8-3 refers to the outer diameter cross-sectional area of A1 piston 8-3 minus the cross-sectional area of the rod.

[0034] The outer ring of the right valve core seat 6 blocks the high pressure oil port P, and the high pressure oil port communication port 6-3 is opened on the right valve core seat 6 to communicate the high pressure oil port P and the inner cavity of the right valve core seat 6. In the open state, the A2 piston 8-4 moves to the right to block the right valve core seat 6, at this time, the low pressure oil port T and the variable oil port Z are communicated, and the variable oil port Z is low pressure oil.

[0035] The outer ring of the left valve core seat 7 blocks the low pressure oil port T, and a plurality of radial holes are opened on the left valve core seat 7 to communicate the low pressure oil port T and the inner cavity of the left valve core seat 7. In the closed state, the A2 piston 8-4 moves to the left to block the left valve core seat 7, at this time, the high pressure oil port P and the variable oil port Z are communicated, and the variable oil port Z is high pressure oil.

[0036] The right valve core seat 6 is provided with a plurality of through-flow oil channels 6-1 communicating the A1 cavity and the variable oil port Z. The through-flow oil channels 6-1 are circumferentially arranged. In this embodiment, the through-flow oil channels 6-1 are circumferentially arranged in three, and the smallest diameter is φ3mm. The through-flow oil channels 6-1 include radial holes and axial holes, so as to realize the communication between the A1 cavity and the variable oil port Z.

[0037] As shown in Figure 3 , the A1 cavity and the variable oil port Z are communicated with a large flow one-way valve 9 opening to the A1 cavity direction. As shown in Figure 5 , the right valve core seat 6 is provided with a communication hole 6-2 communicating the outlet of the large flow one-way valve 9 and the A1 cavity. As shown in Figure 6 , the large flow one-way valve 9 is composed of a one-way valve seat 9-1, a reset spring 9-3, a valve plate 9-2 and a valve sleeve 9-4. When the mechanism is closed, the large flow one-way valve 9 is opened, and the oil enters the A1 cavity through the large flow one-way valve 9, which improves the oil supplement speed of the A1 cavity. The problem of slow oil supplement of the A1 cavity caused by the bubbles generated by the rapidly flowing oil during closing can be solved. When the mechanism is opened, the large flow one-way valve 9 is closed, and the oil in the A1 cavity flows out through the through-flow oil channel 6-1.

[0038] As shown in Figure 4 , the high pressure oil port P and the low pressure oil port T of the control valve are respectively provided with an open flow valve core 11 and a closed flow valve core 13. The open flow valve core 11 and the closed flow valve core 13 are respectively screwed on the valve core seat flow valve core seat 12. By rotating the open flow valve core 11 and the closed flow valve core 13, the insertion amount thereof is adjusted, so as to adjust the cross-sectional size of the high pressure oil port P and the low pressure oil port T, which is used for adjusting the closing and opening speed. The open flow valve core 11 and the closed flow valve core 13 are respectively provided with a nut 14 as a spare nut to prevent loosening and rotation.

[0039] As shown in Figure 10As shown, the electromagnetic repulsion tripping device 2 comprises a tripping device frame body and a connecting rod 17 slidingly connected in the tripping device frame body, the connecting rod 17 is fixedly connected with the spool 8 through a connecting piece 16, the connecting rod 17 is fixedly connected with a main repulsion disc 22 and a secondary repulsion disc 26, and the main repulsion disc 22 and the secondary repulsion disc 26 are separated by a spacer 29.

[0040] The tripping device frame body is fixedly connected with a main sub-coil 21, a closing coil 23 and a secondary sub-coil 25 matched with the secondary repulsion disc 26, and the main repulsion disc 22 is located between the main sub-coil 21 and the closing coil 23.

[0041] In the embodiment, two opening coils and one closing coil are redundantly arranged in the repulsion tripping device, the main and secondary repulsion discs are sleeved on the connecting rod, the main repulsion disc is located between the main sub-coil and the closing coil, and a spacer is arranged between the two repulsion discs. When any one or both of the main and secondary sub-coils is electrified, the electromagnetic forces generated thereby do not affect each other, that is, when the main sub-coil is electrified, only the main repulsion disc is driven to move, and the secondary repulsion disc is not affected, and vice versa. Moreover, when any one of the sub-coils and the repulsion disc works normally, the electromagnetic repulsion tripping device can drive the control valve to complete the oil path switching and realize rapid opening and closing of the switch. In addition, the electromagnetic repulsion tripping device can also realize the function of rapid closing.

[0042] The tripping device frame body comprises a right pressing plate 5, a first guide seat pressing plate 20, a sleeve 24, a second guide seat pressing plate 27 and the like, and the parts are connected together through support rods and fastened by nuts, so as to fix the electromagnetic repulsion tripping device 2 on the right pressing plate 5.

[0043] The electromagnetic repulsion tripping device 2 further comprises a plurality of oil buffers 28 arranged circumferentially along the connecting rod 17, and the oil buffers 28 are arranged on the side of the secondary repulsion disc 26 away from the secondary sub-coil 25. In the embodiment, a plurality of oil buffers are arranged and uniformly distributed, preferably four, which solves the problems of poor opening and closing buffer of single opening coil, large mechanical impact of the opening and closing valve port and easy damage of the valve port. Through high-frequency camera shooting and observation, it is found that the improved valve core reaches the buffer deceleration effect at the end of movement, without mechanical impact and rebound, and the life test also verifies the good effect.

[0044] The connecting rod 17 of the repulsion tripping device is provided with guide seats at both ends, namely a first guide seat 18 and a second guide seat 32, both of which are fixed on the tripping device frame body. A guide sleeve 30 is arranged on the connecting rod 17 away from the control valve, and the guide seat, the connecting rod and the guide sleeve form a guide system for the movement of the connecting rod 17 in the center of the repulsion tripping device.

[0045] In this embodiment, a connecting member 16 connects the connecting rod 17 and the valve core 8. The electromagnetic repulsion tripping device 2 also includes a bistable holding structure 15. The bistable holding structure 15 includes a plurality of sliders 15-4 arranged circumferentially along the connecting rod 17. The sliders 15-4 slide radially in the spring seat 15-2 along the connecting rod 17. The sliders 15-4 are connected to the connecting member 16 through a pull plate 15-3. One end of the pull plate 15-3 is hinged to the slider 15-4, and the other end is hinged to the connecting member 16.

[0046] The spring seat 15-2 contains a retaining spring 15-5 that drives the slider 15-4 to move toward the connector 16. A spring pressure plate 15-1 is fixed to the outside of the spring seat 15-2, and the retaining spring 15-5 is located between the spring pressure plate 15-1 and the slider 15-4.

[0047] How to use this utility model:

[0048] When closing the circuit breaker, such as Figure 10 As shown, the external control power supply energizes the closing coil 23 of the electromagnetic repulsion tripping device 2, generating a pulse current in the coil. The pulse current induces an alternating magnetic field around the coil, generating reverse eddy currents on the electromagnetic repulsion disk. The magnetic field generated by the eddy currents interacts with the magnetic field generated by the coil current to produce an electromagnetic force. Driven by the electromagnetic force, the auxiliary repulsion disk 26 moves to the left, causing the valve core 8 to move to the left. Figure 3 The closed state.

[0049] During the closing process, piston 8-4 of A2 disengages from the valve port of the right valve core seat 6, and variable oil port Z becomes high-pressure oil. At this time, under the action of high-pressure oil, valve plate 9-2 of the high-flow-rate check valve 9 disengages from check valve seat 9-1, and the high-flow-rate check valve 9 opens. Oil enters chamber A1 through the high-flow-rate check valve 9, and at the same time, the high-pressure oil in variable oil port Z also enters chamber A1 through flow passage 6-1. Since chambers A2 and A3 are also connected to the high-pressure oil in high-pressure oil port P, and since S1+S2>S3, the resultant force on valve core 8 is to the left, keeping valve core 8 in the closed position. The closing channel of the control valve opens, realizing the rapid closing action of the mechanism.

[0050] When the opening operation, the external control power supply to the electromagnetic repulsion tripping device 2 main branch coil 21 and vice branch coil 25 power, under the drive of electromagnetic repulsion, vice repulsion disk 26 and main repulsion disk 22 together to the right movement, driving the valve core 8 to the right movement, A2 piston 8-4 and the valve port of left valve core seat 7 is disconnected, variable oil port Z, A1 cavity becomes low pressure oil, at this time the large flow check valve 9 is closed, the liquid of A1 cavity only returns to the variable oil port Z through the through oil passage 6-1, limiting the backflow speed, play the role of buffering the valve core. After opening, A1 cavity becomes low pressure oil, A2 cavity and A3 cavity for high pressure oil, because S2 < S3, so that the valve core remains in the right side of the opening position by the pressure difference, the one-way channel of control valve opens, realizes the mechanism fast opening action.

[0051] As shown in Figure 10 、 11 , when closing operation, connecting piece 16 movement drives the pull plate 15-3 of bistable holding structure 15 to the left movement, slider 15-4 in spring seat 15-2 first upward and then downward movement, closing operation, holding spring 15-5 will control valve is kept in the closing position; similarly, when opening operation, connecting piece 16 movement drives the pull plate 15-3 of bistable holding structure 15 to the right movement, slider in spring seat first upward and then downward movement, opening operation, holding spring will control valve is kept in the opening position, at the same time, can also ensure that the repulsion tripping device connecting rod movement will not rotate.

[0052] In the early stage of the action of the repulsion disk, the larger repulsion force acts on the repulsion disk; in the late stage of the movement of the repulsion disk, in order to reduce the impact of the repulsion disk collision, an external oil buffer 28 is specially arranged, the buffer is redundantly designed, and the buffer gap and the buffer damping of the oil buffer are adjustable, so that the optimal buffering effect is realized. Especially in the late stage of the opening movement of the mechanism, the repulsion disk hits the oil buffer, and the protection effect of the metal seal of the control valve is achieved through the buffering effect of the oil buffer. In the early and late stages of the action of the electromagnetic repulsion tripping device, the repulsion disk and the connecting rod are under great stress, and the mechanical reliability directly affects the reliability of the electromagnetic tripping device.

[0053] Of course, the above description is not limited to the above examples, and the technical features not described in the utility model can be realized by or using the prior art, which will not be repeated here; the above embodiments and drawings are only used to illustrate the technical scheme of the utility model and are not limited to the utility model, the preferred embodiments of the utility model are described in detail, and those skilled in the art should understand that the changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the utility model do not deviate from the purpose of the utility model, and should also belong to the protection scope of the claims of the utility model.

Claims

1. A fast hydraulic operating mechanism control valve characterized by: The control valve assembly (1) comprises a valve seat (3) and a valve core (8), and the electromagnetic repulsion tripping device (2) comprises a tripping device frame body and a connecting rod (17) slidingly connected in the tripping device frame body, and the connecting rod (17) is coaxially connected with the valve core (8).

2. A control valve for a fast hydraulic operating mechanism according to claim 1, characterized in that: The The valve seat (3) is provided with a low-pressure oil port (T), a variable oil port (Z) and a high-pressure oil port (P) arranged along the moving direction of the valve core (8), and the valve seat (3) is fixedly connected with a right valve core seat (6), and the valve core (8) is fixedly connected with an A1 piston (8-3), and the right side of the A1 piston (8-3) forms an A1 cavity with the right valve core seat (6), and the right valve core seat (6) is provided with a through-flow oil channel (6-1) communicating the A1 cavity and the variable oil port (Z).

3. A control valve for a fast hydraulic operating mechanism according to claim 2, characterized in that: The A1 cavity and the variable oil port (Z) are communicated with a large-flow one-way valve (9) opening to the A1 cavity.

4. A control valve for a fast hydraulic operating mechanism according to claim 2, characterized in that: The valve seat (3) is fixedly connected with a left valve core seat (7), and the valve core (8) is further fixedly connected with an A3 piston (8-5) and an A2 piston (8-4), the left side of the A3 piston (8-5) forms an A3 cavity with the left valve core seat (7), the right side of the A2 piston (8-4) is communicated with the left side of the A3 piston (8-5) through a communication hole, the right side of the A2 piston (8-4) forms an A2 cavity with the right valve core seat (6) in the open state, and the A2 cavity is communicated with the high-pressure oil port (P), the pressure receiving cross-sectional areas of the A3 piston (8-5), the A2 piston (8-4) and the A1 piston (8-3) are S3, S2 and S1 respectively, and S1 5. A control valve for a fast hydraulic operating mechanism according to claim 2, characterized in that: The through-flow oil channel (6-1) is provided with a plurality of circumferential arrangements.

6. A control valve for a fast hydraulic operating mechanism according to claim 1, characterized in that: The connecting rod (17) is fixedly connected with a main repulsion disc (22) and a secondary repulsion disc (26), the tripping device frame body is fixedly connected with a main split coil (21), a closing coil (23) and a secondary split coil (25) matched with the secondary repulsion disc (26), and the main repulsion disc (22) is located between the main split coil (21) and the closing coil (23).

7. A control valve for a fast hydraulic operating mechanism according to claim 6, characterized in that: The electromagnetic repulsion tripping device (2) further comprises a plurality of oil buffers (28) arranged circumferentially along the connecting rod (17), and the oil buffers (28) are arranged on the side of the secondary repulsion disc (26) away from the secondary split coil (25).

8. A control valve for a fast hydraulic operating mechanism according to claim 6, characterized in that: The connecting rod (17) and the valve core (8) are connected with a connecting piece (16), and the electromagnetic repulsion tripping device (2) further comprises a bistable retention structure (15), the bistable retention structure (15) comprises a plurality of sliding blocks (15-4) arranged circumferentially along the connecting rod (17), the sliding blocks (15-4) are radially slidingly connected in a spring seat (15-2) along the connecting rod (17), the sliding blocks (15-4) are connected with the connecting piece (16) through a pull plate (15-3), and the spring seat (15-2) is provided with a retention spring (15-5) driving the sliding blocks (15-4) to move to the connecting piece (16).

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