WO2019015163A1 - Hydraulic operating mechanism and switch - Google Patents

Abstract

Provided are a hydraulic operating mechanism and a switch using the hydraulic operating mechanism to achieve adjustment and control of a "close-open" time of a circuit breaker. The hydraulic operating mechanism comprises a working cylinder (7) having a working cylinder piston rod (8), and a main valve (13) for controlling movement of the working cylinder piston rod (8), and a closing valve connected to the main valve (13) by controlling an oil passage. The closing valve is controlled by a closing electromagnet (17). The hydraulic operating mechanism further comprises an auxiliary switch (3) for controlling the opening and closing of a circuit where the closing electromagnet (17) is located. The hydraulic operating mechanism further comprises a signal cylinder (4) that triggers the auxiliary switch (3) during a reciprocating movement of the piston rod. Two chambers of the signal cylinder (4) are respectively in communication with the two chambers of the working cylinder (7). During operation, the piston rod of the signal cylinder (4) can move only when the working cylinder (7) drives the switch to close in position, and the auxiliary switch (3) is triggered to control the power loss of the closing electromagnet (17). The occurrence of the opening of the circuit breaker after the circuit breaker is not closed in position can be avoided, and the control to the "close-open" time of the circuit breaker is realized.

Description

Hydraulic operating mechanism and switch Technical field

The invention relates to a hydraulic operating mechanism and a switch comprising the hydraulic operating mechanism.

Background technique

The hydraulic operating mechanism is generally applied to ultra-high voltage and ultra-high voltage circuit breakers for operating the circuit breaker to perform the opening and closing operations. The hydraulic operating mechanism is characterized by constant charging and high pressure maintenance, instantaneous action, large operating force, high opening speed, quick and stable action, and has the advantage that other operating mechanisms are irreplaceable. According to the energy storage mode, the hydraulic operating mechanism can be divided into a nitrogen storage energy storage hydraulic mechanism and a disc spring energy storage hydraulic mechanism. The disc spring energy storage hydraulic mechanism stores energy through the compression disc reed, the working pressure is high, and the reliability of the domestic disc reed is reliable. And its stability needs long-term verification. In addition, due to the large amount of disc springs and high price, the price of the disc spring energy storage hydraulic mechanism is relatively high. Therefore, the hydraulic operating mechanism of the nitrogen storage method is still commonly used at present. The energy storage device of the nitrogen energy storage hydraulic mechanism is generally applied to various hydraulic systems by compressing the nitrogen storage energy in the pressure storage cylinder, having a simple structure and low cost.

The requirements of the power system for the performance of the circuit breaker are getting higher and higher, and the breaking current of the circuit breaker is getting larger and larger. The circuit breaker generally adopts a pressure-type arc extinguishing chamber, and the squeezing cylinder of the arc extinguishing chamber compresses the SF6 gas and extinguishes it by blowing the air. Arc, breaking circuit. The increase of the breaking current requires that the operating mechanism can meet the requirement of the opening speed of more than ten meters per second proposed by the circuit breaker, and the completion time of the opening and closing action of the circuit breaker is only several tens of milliseconds, and it is necessary to put in such a short time. The speed of the circuit breaker contacts and the entire motion system is accelerated to such a high value, and the opening speed is lowered again to avoid excessive shock vibration at the end of the opening, which requires control in the hydraulic operating mechanism. The valve flow rate should be large, and the transmission efficiency of the hydraulic system should be high to meet the requirements of the opening speed. Secondly, the operating time of the entire hydraulic system should be short to meet the requirements of the opening time. In addition, the buffering characteristics of the hydraulic mechanism should be good. Avoid Parts are damaged and damaged when the opening and closing operations are completed.

The hydraulic operation mechanism of the early circuit breaker generally adopts the method of separate installation of hydraulic components. There are many external pipelines between the components, and there are many sealing links. The overall operation mechanism is complicated in structure, the appearance is not beautiful, and oil leakage is likely to occur during product operation. This structure is currently rarely used. With the advancement of technology, the current hydraulic operating mechanism adopts a modular and integrated design method to combine the functions of each component to simplify the structure of the hydraulic system, improve the transmission efficiency of the hydraulic system, and reduce the external piping. Improve the mechanical performance and sealing performance of the product, reduce the overall structural size of the hydraulic operating mechanism, and make the hydraulic operating mechanism compact, tidy and beautiful.

A utility model patent with the authorization announcement date being July 23, 2014 and the authorization announcement number CN203733655U discloses a hydraulic operating mechanism for opening and closing and a grounding switch using the operating mechanism, the hydraulic operating mechanism The utility model comprises a working rod and a piston rod in the working cylinder. The piston rod can control the switch to open and close, the working cylinder is connected with a three-stage electro-hydraulic control valve, and the three-stage electro-hydraulic control valve comprises a three-stage valve for controlling the movement of the piston rod (ie, the main valve The third-stage valve is connected to the secondary valve through the oil passage, and the secondary valve includes the secondary valve and the closing secondary valve, and the secondary valve and the closing secondary valve pass through the oil passage and the corresponding first-stage valve. The first-stage valve is connected with the closing valve, and the first-stage valve and the closing first-stage valve are electromagnetic reversing valves composed of an electromagnet and a pilot valve. When closing, the closing electromagnet works in turn to close the first-stage valve and close the secondary valve to drive the third-stage valve to move, thereby pushing the piston rod in the working cylinder to displace and realize the closing. The iron work in turn drives the first-stage valve and the secondary valve to drive the third-stage valve to move in the opposite direction, thereby pushing the piston rod in the working cylinder to reverse displacement to realize the opening.

However, when there is a pre-volt fault on the transmission line, the breaker must be opened immediately after closing to quickly cut off the faulty line. If the breaker is not closed, the breaker will be opened, and the breaker's breaking performance will not be guaranteed. The operating mechanism must be able to ensure that the circuit breaker is opened after the switch is in place, that is, to ensure the "shared" time of the circuit breaker. In actual work, the power system requires that the operating mechanism of the circuit breaker must mechanically ensure the "shared" time of the circuit breaker, and the method of using the time delay relay in the electrical control circuit.

Summary of the invention

A first object of the present invention is to provide a hydraulic operating mechanism for effecting adjustment and control of the "shared" time of the circuit breaker.

A second object of the present invention is to provide a switch that uses the hydraulic operating mechanism provided by the present invention.

In order to achieve the above first object, the present invention provides a hydraulic operating mechanism including a working cylinder having a piston rod of a working cylinder, a main valve for controlling movement of the piston rod of the working cylinder, and a joint connected to the main valve through the control oil passage. a gate valve, the closing valve is controlled by a closing electromagnet, and the working cylinder piston rod is movable between a closing position when the cylinder is extended and a closing position when retracting, wherein the hydraulic operating mechanism further comprises An auxiliary switch for controlling on and off of a circuit in which the closing electromagnet is located, the hydraulic operating mechanism further comprising a signal cylinder, the piston rod of the signal cylinder being capable of triggering the auxiliary switch during a reciprocating motion, the signal cylinder The two chambers are respectively in communication with the two chambers of the working cylinder to allow the signal cylinder to interlock with the working cylinder.

Preferably, the hydraulic operating mechanism includes a gate valve connected to the main valve through a control oil passage, the gate valve is controlled by a shutter electromagnet, and the auxiliary switch is further configured to control a loop of the opening electromagnet Broken.

Preferably, a rod cavity of the signal cylinder is in communication with a rod cavity of the working cylinder, and a rodless cavity of the signal cylinder is connected to a rodless cavity of the working cylinder

Preferably, the auxiliary switch is a single-pole double-throw switch for controlling the closing electromagnet and the opening electromagnet or a signal contact for transmitting an indication signal of the circuit breaker at the closing position and the opening position.

Preferably, the hydraulic operating mechanism further includes an accumulator, a fuel tank and an oil pump, the accumulator includes a liquid storage chamber, and a rod cavity of the working cylinder communicates with the liquid storage chamber to form a constant high pressure chamber. The rodless chamber of the working cylinder is capable of communicating with the reservoir or the oil tank through the main valve to form a switching chamber.

Preferably, an intermediate chamber of the main valve is in communication with a switching chamber of the working cylinder, the main valve a right side chamber is connected to the oil tank, a left side chamber of the main valve is connected to the liquid storage chamber, and a valve stem that can move left and right is installed in the main valve, and the valve rod is provided with a stopper portion. When the stopping portion is located at a position between the switching chamber and the liquid storage chamber in the main valve, the stopping portion can cut off a passage between the switching chamber and the liquid storage chamber to communicate between the switching chamber and the oil tank; When the stopping portion is located at a position between the switching chamber and the oil tank in the main valve, the stopping portion can cut off a passage between the switching chamber and the oil tank to communicate between the switching chamber and the liquid storage chamber.

Preferably, the main valve includes a left end cavity at a left end of a spool of the main valve, the closing valve includes a closing primary valve and a closing secondary valve, and the opening valve includes a primary valve and a divided valve a gate secondary valve, the closing secondary valve including a first port connected to a left end cavity of the main valve, a second port connected to a left side cavity of the main valve, and a connection to the closing a third port of the primary valve, wherein the closing secondary valve is opened by the pressure relief of the closing primary valve when the closing primary valve is opened, so that the first port and the second oil are Port opening, the opening secondary valve includes a fourth port connected to the right side cavity of the main valve, a fifth port connected to the left end cavity of the main valve, and a first stage connected to the opening a sixth oil port of the valve, wherein the opening secondary valve is opened by the pressure relief of the first-stage valve when the first-stage valve is opened, so that the fourth oil port and the fifth oil port are connected .

Preferably, the hydraulic operating mechanism further includes a safety valve, a hydraulic switch, an oil pump and an oil pump motor, and an oil inlet and outlet passage of the energy storage device is connected to the safety valve, and the safety valve is connected to the oil pressure switch. An oil inlet and outlet passage of the accumulator is further connected to the oil pump and the oil pump motor, one end of the oil pump is connected to the accumulator, and the other end of the oil pump extends into the oil tank through a first passage, the fuel tank and The oil pumps are also connected by a second passage, and the second passage is provided with a high pressure drain valve.

Preferably, the hydraulic operating mechanism includes a plurality of valve blocks formed in one piece.

Preferably, the plurality of valve blocks comprise a first valve block, a second valve block, a third valve block and a fourth valve block assembled from top to bottom, the working cylinder being integrated on the first valve block The main valve is integrated on the second valve block, and the closing secondary valve is integrated on the third valve block, and the closing level is a valve is integrated on the fourth valve block, the signal cylinder, an accumulator and an oil pump are located at one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block .

Preferably, the first valve block is provided with a connecting passage for connecting the normal high pressure chamber and the main valve of the working cylinder, and the connecting passage is located on a side of the first valve block adjacent to the signal cylinder.

In order to achieve the above second object, the present invention also provides a switch, wherein the switch comprises the hydraulic operating mechanism described in the above technical solution.

A third object of the present invention is to provide a hydraulic operating mechanism and a switch using the hydraulic operating mechanism to achieve adjustment and control of the "shared" time of the circuit breaker.

In order to achieve the above third object, the technical solution of the hydraulic operating mechanism of the present invention is: a hydraulic operating mechanism comprising a working cylinder having a piston rod of a working cylinder, and a main valve for controlling movement of the piston rod of the working cylinder and The closing valve is controlled by the closing electromagnet by controlling the closing valve connected to the main valve of the oil circuit, and the hydraulic operating mechanism further comprises an auxiliary switch for controlling the opening and closing of the circuit of the closing electromagnet, and the hydraulic operating mechanism further comprises a piston rod The signal cylinder of the auxiliary switch is triggered during the reciprocating motion, and the two chambers of the signal cylinder are respectively in communication with the two chambers of the working cylinder.

Further, the closing valve comprises a closing secondary valve and a closing primary valve controlled by the closing electromagnet, and the hydraulic operating mechanism comprises a first valve block, a second valve block, and a first valve block arranged from top to bottom. a three-valve block and a fourth valve block, the working cylinder is integrated on the first valve block, the main valve is integrated on the second valve block, and the closing secondary valve is integrated on the third valve block, The closing primary valve is integrated on the fourth valve block.

Further, the side of the first valve block is provided with an accumulator, a hydraulic switch, a fuel tank, an oil pump and the signal cylinder.

Further, the signal cylinder, the accumulator and the oil pump are located on one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block.

Further, the working cylinder has a rod chamber which is a constant high pressure chamber, and the rodless chamber is a switching chamber which can be switched between a high pressure and a low pressure, and the first valve block is provided with a passage for connecting the normal high pressure chamber and the main valve of the working cylinder. The passage is located on a side of the first valve block adjacent to the signal cylinder.

The technical solution of the switch of the invention is: a switch comprising a hydraulic operating mechanism, the hydraulic operating mechanism comprising a working cylinder having a piston rod of a working cylinder, and a main valve for controlling movement of the piston rod of the working cylinder and by control The closing valve of the oil circuit connected to the main valve, the closing valve is controlled by the closing electromagnet, and the hydraulic operating mechanism further comprises an auxiliary switch for controlling the closing and closing of the closing electromagnet, and the hydraulic operating mechanism further comprises a piston rod in the round trip. The signal cylinder of the auxiliary switch is triggered during the movement, and the two chambers of the signal cylinder are respectively connected to the two chambers of the working cylinder.

Further, the closing valve comprises a closing secondary valve and a closing primary valve controlled by the closing electromagnet, and the hydraulic operating mechanism comprises a first valve block, a second valve block, and a first valve block arranged from top to bottom. a three-valve block and a fourth valve block, the working cylinder is integrated on the first valve block, the main valve is integrated on the second valve block, and the closing secondary valve is integrated on the third valve block, The closing primary valve is integrated on the fourth valve block.

Further, the side of the first valve block is provided with an accumulator, a hydraulic switch, a fuel tank, an oil pump and the signal cylinder.

Further, the signal cylinder, the accumulator and the oil pump are located on one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block.

Further, the working cylinder has a rod chamber which is a constant high pressure chamber, and the rodless chamber is a switching chamber which can be switched between a high pressure and a low pressure, and the first valve block is provided with a passage for connecting the normal high pressure chamber and the main valve of the working cylinder. The passage is located on a side of the first valve block adjacent to the signal cylinder.

The invention has the beneficial effects that the two chambers of the signal cylinder are respectively connected with the two chambers of the working cylinder, and the pressure difference between the two chambers of the working cylinder causes the piston rod of the working cylinder to move to close or close the switch. The gate, because the two chambers of the signal cylinder are respectively connected with the two chambers of the working cylinder, when the working cylinder is working, there is also a pressure difference in the two chambers of the signal cylinder, so that the piston rod of the signal cylinder also goes back and forth. Movement, the piston rod of the signal cylinder in different positions can trigger different states of the auxiliary switch, and realize the time for controlling the opening and closing of the circuit where the electromagnet is closed. When working, when the working cylinder drives the switch to close in position, the piston rod of the signal cylinder can move, trigger the auxiliary switch to control the power loss of the closing electromagnet, and then the electromagnet can be turned off to obtain electricity, avoiding the circuit breaker at Unclosed When the door is opened, the opening is performed, and the control of the "separation" time of the circuit breaker is realized.

DRAWINGS

1 is a schematic diagram of a hydraulic circuit in an embodiment of a hydraulic operating mechanism of the present invention;

Figure 2 is a hydraulic circuit diagram of the main valve, the closing valve, and the opening valve of Figure 1;

Figure 3 is a front elevational view showing an embodiment of the hydraulic operating mechanism of the present invention;

Figure 4 is a left side view of Figure 3;

Figure 5 is a right side view of Figure 3;

Figure 6 is a rear elevational view of Figure 3.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

A specific embodiment of the hydraulic operating mechanism of the present invention is shown in FIGS. 1 to 6 , wherein 1 is an oil pump, 2 is an oil pump motor, 3 is an auxiliary switch, 4 is a signal cylinder, 5 is an energy storage device, 6 is Pressure gauge, 7 is the working cylinder, 8 is the working cylinder piston rod, 9 is the oil pressure switch, 10 is the safety valve, 11 is the fuel tank, 12 is the high pressure oil discharge valve, 13 is the main valve, 14 is the secondary valve of the opening, 15 is the first-stage valve, 16 is the opening electromagnet, 17 is the closing electromagnet, 18 is the closing first-stage valve, 19 is the closing secondary valve, 20 is the control valve, and the control valve 20 includes the above The main valve 13, the secondary valve 14, the first-stage valve 15, the opening electromagnet 16, the closing electromagnet 17, the closing primary valve 18, and the closing secondary valve 19, 21 are speed-regulating screws. 22 is the oil pipe, 23 is the oil vapor separator, 24 is the oil mark, 25 is the low pressure drain valve, 26 is the fourth valve block, 27 is the third valve block, 28 is the second valve block, and 29 is the first valve block. .

1 is a schematic diagram of a hydraulic circuit of the present embodiment, the energy storage device 5 is a nitrogen gas storage device, the bottom of the energy storage device 5 is provided with a nitrogen storage unit, and the upper portion is a liquid storage chamber for storing hydraulic oil, and the liquid storage chamber A pressure gauge 6 is installed on the inlet and outlet oil passages to observe the pressure of the reservoir chamber in and out of the oil passage in real time. The inlet and outlet oil passages of the accumulator 5 are connected with a safety valve 10, and the safety valve 10 is connected with an oil pressure switch 9. The oil inlet and outlet passages of the accumulator 5 are also connected with an oil pump 1 and an oil pump motor 2, one end of the oil pump 1 and the accumulator 5 Connected, another One end projects into the oil tank 11. The low pressure oil is stored in the oil tank 11, and the oil tank 11 and the oil pump 1 are connected through another passage, and the high pressure oil discharge valve 12 is arranged on the passage.

The working cylinder 7 comprises two chambers, the upper part of the working cylinder piston rod 8 has a rod cavity, the lower part is a rodless cavity, and the rod cavity communicates with the liquid storage chamber of the accumulator 5 to form a constant high pressure chamber, and the rodless chamber can be A switching chamber is formed in communication with the reservoir or the oil tank 11, and the switching chamber is in communication with the main valve 13. The main valve 13 is connected to the switching chamber of the working cylinder in the middle, the right side is connected to the oil tank 11, and the left side is connected to the liquid storage chamber of the accumulator 5. The main valve 13 is provided with a valve stem which can be moved left and right, and the valve stem is provided with a valve block. a stop portion, when the valve stem stopper is located between the switching chamber and the liquid storage chamber in the main valve 13, the valve stem stopper can cut off the passage between the switching chamber and the liquid storage chamber to make the switching chamber and the oil tank Interconnected; when the stopper of the valve stem is located at a position between the switching chamber and the oil tank in the main valve 13, the valve stem stopper can cut off the passage between the switching chamber and the oil tank to make the switching chamber and the liquid storage chamber Interconnected.

The hydraulic operating mechanism further includes a valve assembly for controlling the left and right movement of the valve stem of the main valve 13, the valve assembly including a closing solenoid valve and a closing solenoid valve. The opening and closing solenoid valve comprises an opening secondary valve 14 and an opening primary valve 15, and the opening primary valve 15 is controlled by the opening electromagnet 16. The lower chamber of the split secondary valve 14 is connected to the reservoir through the primary valve 15 of the opening, and the upper chamber of the secondary valve 14 is in communication with the main valve. The closing solenoid valve includes a closing secondary valve 19 and a closing primary valve 18, and the closing primary valve 18 is controlled by a closing electromagnet 17. The lower chamber of the closing secondary valve 19 is connected to the reservoir through the closing primary valve 18, and the upper chamber of the closing secondary valve 19 is in communication with the main valve 13.

The signal cylinder 4 is connected in parallel with the working cylinder 7. The upper part of the signal cylinder 4 has a rod cavity, and the rod cavity communicates with the liquid storage chamber of the accumulator 5 and the constant high pressure chamber of the working cylinder 7 to form a constant high pressure of the signal cylinder. The cavity, below the signal cylinder 4 is a rodless cavity, and the rodless cavity communicates with the switching cavity of the working cylinder 7 to form a switching cavity of the signal cylinder. The piston rod (not shown) of the signal cylinder 4 is connected to the auxiliary switch 3. When the piston rod of the signal cylinder 4 is actuated, the auxiliary switch 3 can be switched, and the auxiliary switch 3 can control the control of the closing electromagnet 17 and the opening electromagnet 16 The circuit is turned on and off.

The working process of the hydraulic operating mechanism in this embodiment is as follows:

(1) Energy storage stage: When the pressure of the high pressure circuit in the hydraulic operating mechanism is lower than the set value, the micro switch of the control motor starting and stopping in the oil pressure switch 9 is closed, and the oil pump motor 2 is charged to drive the oil pump 3 to operate. The low-pressure oil in the oil tank 11 enters the liquid storage chamber of the accumulator 5 via the oil pump 3, and the lower nitrogen gas is compressed by the piston in the accumulator 5 to store energy, so that the low-pressure oil in the liquid storage chamber of the accumulator 5 Become high pressure oil. When the pressure of the high pressure oil reaches the rated pressure in the hydraulic operating mechanism, the oil pressure switch 9 controls the oil pump motor 2 to be powered off, and the energy storage process is completed. When the pressure of the high pressure oil in the hydraulic operating mechanism is too high, the safety valve 10 is opened to allow the high pressure oil to enter the oil tank 11. During product commissioning, the high pressure drain valve 12 can be opened to release high pressure oil into the tank.

(2) Closing action: The state of the hydraulic operating mechanism in Fig. 1 is the opening state. The electric control command is applied to the closing electromagnet 17, and the closing electromagnet 17 is energized to open and close the first-stage valve 18, and the high-pressure oil of the lower portion of the closing secondary valve 19 is released by the closing primary valve 18. The spool moves downwards and opens the closing secondary valve. The high pressure oil enters the left end of the rod of the main valve 13 through the closing secondary valve, thereby pushing the valve stem of the main valve 13 to the right to cause the valve stem stopper to cut off the passage between the switching chamber and the oil tank 11 to open the switching chamber and store The passage between the liquid chambers, the high pressure oil enters the switching chamber of the working cylinder 7. At this time, the upper and lower chambers of the working cylinder 7 are all high-pressure chambers and the pressure is the same, but the switching chamber is a rod-free cavity, and the high-pressure chamber has a rod cavity, and the force-receiving area of the rod-free cavity is larger than the force-receiving area of the rod cavity. The working cylinder piston rod 8 is subjected to an upward force to control the circuit breaker to achieve closing.

While the working cylinder 7 is closed, since the chambers of the signal cylinder 4 are respectively in communication with the chamber of the working cylinder 7, and the switching chamber of the working cylinder 7 is in a high pressure state, the switching chamber of the signal cylinder is also in a high pressure state, the signal cylinder The piston rod moves upward under the action of the pressure difference, and drives the auxiliary switch 3 to complete the switching. The auxiliary switch 3 cuts off the closing control circuit, causes the closing electromagnet 17 to lose power and returns, and closes the first stage valve 18 and the closing secondary valve 19 When reset, the main valve 13 is kept in the closed position, so that the circuit breaker is maintained in the closed state, and the closing operation is completed.

(3) Opening action: When the opening is required, the electric control command is applied to the opening electromagnet 16, the opening electromagnet is energized, the opening first stage valve 15 is opened, and the lower part of the secondary valve 14 is opened. High pressure oil pass The first-stage valve is over-pressured, the spool moves downward, and the secondary valve is opened. The high pressure oil at the left end of the rod of the main valve 13 is discharged through the secondary valve 14 and discharged into the oil tank, and the rod of the main valve 13 is moved to the left by the high pressure oil at the right end, and the liquid storage chamber and the switching chamber are cut off. The passage connects the switching chamber to the oil tank 11. At this time, the high pressure chamber pressure of the working cylinder 7 is greater than the pressure of the switching chamber, and the working cylinder piston rod 8 moves downward under the action of the pressure difference, and the circuit breaker is controlled to realize the opening operation.

While the working cylinder 7 is opened, the chamber of the signal cylinder 4 is respectively in communication with the chamber of the working cylinder 7, and when the switching chamber of the working cylinder 7 is in a low pressure state, the switching chamber of the signal cylinder is also in a low pressure state, the signal cylinder The piston rod moves downward under the action of the pressure difference, and at the same time drives the auxiliary switch 3 to complete the switching, the auxiliary switch 3 cuts off the opening control circuit, causes the opening electromagnet 16 to lose power and returns, and opens the first stage valve 15 and the second opening The stage valve 14 is reset, the main valve 13 is maintained at the open position, the circuit breaker is maintained in the open state, and the opening action is completed.

In this embodiment, the two chambers of the signal cylinder are correspondingly connected with the two chambers of the working cylinder, thereby realizing the synchronous action, controlling the time during which the closing electromagnet and the opening electromagnet are energized and de-energized, thereby controlling the circuit breaker. The "shared" time ensures that the circuit breaker can be opened after the switch is closed, which improves the reliability and breaking performance of the circuit breaker.

The closing electromagnet and the opening electromagnet are de-energized while the working cylinder piston rod 8 is moved, and the movement of the working cylinder piston rod 8 is not affected, and the closing electromagnet and the opening electromagnet are prevented from moving in the piston rod 8. After being charged, the electromagnet will be charged for a long time to shorten the life.

As can be seen in Figure 1, the hydraulic operating mechanism includes four upper and lower assembled valve blocks, and the opening primary valve 15 and the closing primary valve 18 are integrated on the fourth valve block 26, and the secondary valve 14 is opened. The closing and closing valve 19 is integrated on the third valve block 27, the main valve 13 is integrated on the second valve block 28, and the working cylinder 7 is integrated in the first valve block 29. The accumulator 5, the oil pump 1, the oil pump motor 2, the auxiliary switch 3 and the signal cylinder 4 are located on the left side of the first valve block 29, and the oil pressure switch 9, the relief valve 10 and the oil tank 11 are located on the right side of the first valve block 29. The upper chamber of the working cylinder is a normally high pressure chamber, and the passage of the normal high pressure chamber and the main valve is located on the left side of the first valve block 29, that is, the side on which the signal cylinder 4 is located.

3 to 6 are external views of the hydraulic operating mechanism of the embodiment, in which the oil vapor separator 23 is mounted on the upper portion of the oil tank 11, and the oil tank 12 is also mounted on the oil tank 11 to understand the low pressure oil in the oil tank 11 in real time. In the storage condition, a high pressure drain valve 12 and a low pressure drain valve 25 are also mounted on the fuel tank 11 for discharging high pressure oil and low pressure oil in the hydraulic operating mechanism. The control valve 20 includes all of the valves in the hydraulic operating mechanism of the present embodiment, and a timing screw 21 is provided at the lower portion of the control valve 20 to adjust the control speed of the control valve. The valve blocks are connected by opening an oil passage, and the working cylinder 7 and the accumulator 5 are connected by a tubing 22.

The hydraulic operating mechanism of the embodiment is centered on the working cylinder 7, and the working cylinder 7 adopts a rectangular parallelepiped structure, and the upper end is connected with a portion of the circuit breaker for connecting with the hydraulic operating mechanism, and a multi-body body is installed at the lower end, and the working cylinder 7 and more The control valve 20, the signal cylinder 4, the auxiliary switch 3, the oil pressure switch 9, the safety valve 10, the oil pump 1, the oil pump motor 2 and the oil tank 11 are respectively mounted on the four sides formed after the whole body connection, and there are two energy storage devices on the periphery. The device 5 is connected to the working cylinder 7 through a tubing 22. In the embodiment, the oil pump 1 and the oil pump motor 2 are integrated into a single unit, and the auxiliary switch 3 and the signal cylinder 4 are combined in a direct connection manner, and the oil pressure switch 9 and the safety valve 10 are integrated into one body, and the high pressure oil discharge valve 12 is integrated. The low-pressure oil drain valve 25 and the oil tank 11 are integrated into one body, and all the components are assembled together with the working cylinder as a center, so that the integration degree of the product is greatly improved, and the product structure is more compact. The structure of the whole product is simplified, the outer dimensions of the whole mechanism are reduced, and the miniaturization and serialization of the operating mechanism are facilitated, the generality of components is improved, and the product cost is reduced.

In this embodiment, the opening and closing valve and the closing secondary valve constitute a closing valve, and the closing primary valve and the closing secondary valve constitute a closing valve.

In this embodiment, the contact of the auxiliary switch can be increased or decreased as needed, and the mode of the auxiliary switch controlling the closing electromagnet and the opening electromagnet can be an ordinary single-pole double-throw switch, that is, the electromagnetic connection is realized by the mechanical connection relationship. The control of the iron and the opening electromagnet can also be used as a signal contact to transmit an indication signal of the circuit breaker at the closing position and the opening position, and the circuit for closing the closing electromagnet and the opening electromagnet is turned on and off by transmitting an indication signal.

In this embodiment, the circuit in which the opening electromagnet and the closing electromagnet are located is a normally closed circuit, and is charged during the opening and closing; in other embodiments, the circuit in which the opening electromagnet and the closing electromagnet are located may also be Open the circuit and lose power when it is closed.

In other embodiments, the accumulator can be other forms of accumulators, such as spring accumulators and the like.

In a specific embodiment of the switch of the present invention, the switch comprises a hydraulic operating mechanism, and the structure of the hydraulic operating mechanism is identical to the structure of the hydraulic operating mechanism embodiment, and the details thereof are not described herein.

The above is only the specific embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the scope of the present invention. within.

In addition, any combination of various embodiments of the invention may be made as long as it does not deviate from the idea of the invention, and it should be regarded as the disclosure of the invention.

Claims (22)

A hydraulic operating mechanism includes a working cylinder having a piston rod of a working cylinder, a main valve for controlling movement of the piston rod of the working cylinder, and a closing valve connected to the main valve through a control oil passage, the closing valve being closed by an electromagnet Controlling that the piston rod of the working cylinder is movable between a closing position when being extended and a closing position when retracting, wherein the hydraulic operating mechanism further comprises: controlling the closing electromagnet An auxiliary switch for turning on and off the circuit, the hydraulic operating mechanism further comprising a signal cylinder, wherein the piston rod of the signal cylinder is capable of triggering the auxiliary switch during a reciprocating motion, and the two chambers of the signal cylinder are respectively associated with the working cylinder The two chambers are correspondingly connected to allow the signal cylinder to interlock with the working cylinder. The hydraulic operating mechanism according to claim 1, wherein said hydraulic operating mechanism comprises a trip valve connected to the main valve by a control oil passage, said trip valve being controlled by a tripping electromagnet, said auxiliary switch It is also used to control the circuit of the opening electromagnet to be turned on and off. The hydraulic operating mechanism according to claim 1, wherein a rod chamber of the signal cylinder is in communication with a rod chamber of the working cylinder, and the rodless chamber of the signal cylinder and the working cylinder are absent. The rod cavity is connected. The hydraulic operating mechanism according to claim 2, wherein said auxiliary switch is a single-pole double-throw switch for controlling a closing electromagnet and a tripping electromagnet or for transmitting a circuit breaker at a closing position and an opening position. The signal contact of the indicator signal. The hydraulic operating mechanism according to claim 1, wherein said hydraulic operating mechanism further comprises an accumulator, a fuel tank and an oil pump, said accumulator comprising a liquid storage chamber, said cylinder having a rod cavity And communicating with the liquid storage chamber to form a constant high pressure chamber, wherein the rodless chamber of the working cylinder can communicate with the liquid storage chamber or the oil tank through the main valve to form a switching chamber. The hydraulic operating mechanism according to claim 2, wherein an intermediate chamber of the main valve is in communication with a switching chamber of the working cylinder, and a right chamber of the main valve is connected to the oil tank, the main a left side chamber of the valve is connected to the liquid storage chamber, and a valve stem that can move left and right is installed in the main valve. The valve stem is provided with a stopping portion capable of cutting off a passage between the switching chamber and the liquid storage chamber when the stopping portion is located at a position between the switching chamber and the liquid storage chamber in the main valve And communicating between the switching chamber and the oil tank; when the stopping portion is located at a position between the switching chamber and the oil tank in the main valve, the stopping portion can cut off the passage between the switching chamber and the oil tank to make the switching chamber Connected to the reservoir. The hydraulic operating mechanism according to claim 6, wherein said main valve comprises a left end chamber at a left end of a spool of said main valve, said closing valve comprising a closing primary valve and a closing secondary valve The opening valve includes a split primary valve and a secondary valve, and the closing secondary valve includes a first port connected to a left end cavity of the main valve and connected to a left side of the main valve a second port of the cavity and a third port connected to the closing stage valve, the closing level valve is opened by the closing level valve when the closing level valve is opened a first oil port and a second oil port, wherein the opening secondary valve includes a fourth oil port connected to the right side cavity of the main valve, and a left end cavity connected to the main valve a fifth oil port and a sixth oil port connected to the first-stage valve of the opening, the opening second-stage valve is opened by the pressure-relief of the first-stage valve when the first-stage valve is opened, The fourth port and the fifth port are connected. The hydraulic operating mechanism according to claim 7, wherein the hydraulic operating mechanism further comprises a safety valve, a hydraulic switch, an oil pump and an oil pump motor, and an oil inlet and outlet passage of the energy storage device and the safety valve Connecting, the safety valve is connected to the oil pressure switch, and the oil inlet and outlet passage of the energy storage device is further connected to the oil pump and the oil pump motor, one end of the oil pump is connected to the energy storage device, and the other end of the oil pump passes through A passage extends into the oil tank, and the oil tank is connected to the oil pump through a second passage, and the second passage is provided with a high pressure oil discharge valve. The hydraulic operating mechanism according to claim 8, wherein said hydraulic operating mechanism comprises a plurality of valve blocks formed integrally. The hydraulic operating mechanism according to claim 9, wherein said plurality of valve blocks comprise a first valve block, a second valve block, a third valve block and a fourth valve block which are assembled from top to bottom. The work a cylinder is integrated on the first valve block, the main valve is integrated on the second valve block, the closing secondary valve is integrated on the third valve block, and the closing primary valve is integrated On the fourth valve block, the signal cylinder, the accumulator and the oil pump are located at one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block. The hydraulic operating mechanism according to claim 10, wherein said first valve block is provided with a connecting passage for connecting a normal high pressure chamber and a main valve of said working cylinder, said connecting passage being located at said A valve block is adjacent to one side of the signal cylinder. A switch characterized in that the switch comprises a hydraulic operating mechanism according to any one of claims 1 to 11. A hydraulic operating mechanism includes a working cylinder having a piston rod of a working cylinder, a main valve for controlling movement of a piston rod of the working cylinder, and a closing valve connected to the main valve through a control oil passage, and the closing valve is closed by an electromagnet Control, characterized in that: the hydraulic operating mechanism further comprises an auxiliary switch for controlling the opening and closing of the circuit of the closing electromagnet, and the hydraulic operating mechanism further comprises a signal cylinder for triggering the auxiliary switch during the reciprocating movement of the piston rod, the signal The two chambers of the cylinder are respectively in communication with the two chambers of the working cylinder. The hydraulic operating mechanism according to claim 13, wherein the closing valve comprises a closing secondary valve and a closing primary valve controlled by said closing electromagnet, and the hydraulic operating mechanism comprises a top to bottom group a first valve block, a second valve block, a third valve block and a fourth valve block, the working cylinder is integrated on the first valve block, the main valve is integrated on the second valve block, and the closing is performed The secondary valve is integrated on the third valve block, and the closing primary valve is integrated on the fourth valve block. The hydraulic operating mechanism according to claim 14, wherein the side of the first valve block is provided with an accumulator, a hydraulic switch, a fuel tank, an oil pump, and the signal cylinder. The hydraulic operating mechanism according to claim 15, wherein the signal cylinder, the accumulator and the oil pump are located on one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block. A hydraulic operating mechanism according to claim 16 wherein there is a rod in the working cylinder The chamber is a constant high pressure chamber, and the rodless chamber is a switching chamber that can be switched between a high pressure and a low pressure. The first valve block is provided with a passage for connecting the normal high pressure chamber of the working cylinder and the main valve, and the passage is located at the first valve. The block is near the side of the signal cylinder. A switch includes a hydraulic operating mechanism including a working cylinder having a piston rod of a working cylinder, a main valve for controlling movement of the piston rod of the working cylinder, and a joint connected to the main valve through the control oil passage The gate valve and the closing valve are controlled by a closing electromagnet, wherein the hydraulic operating mechanism further comprises an auxiliary switch for controlling the closing and closing of the closing electromagnet, and the hydraulic operating mechanism further comprises a piston rod triggering during the reciprocating motion. The signal cylinder of the auxiliary switch, the two chambers of the signal cylinder are respectively connected to the two chambers of the working cylinder. The switch according to claim 18, wherein the closing valve comprises a closing secondary valve and a closing primary valve controlled by said closing electromagnet, and the hydraulic operating mechanism comprises a top to bottom assembly a valve block, a second valve block, a third valve block and a fourth valve block, the working cylinder being integrated on the first valve block, the main valve being integrated on the second valve block, the closing secondary valve Integrated on the third valve block, the closing primary valve is integrated on the fourth valve block. The switch according to claim 19, wherein the side of the first valve block is provided with an accumulator, a hydraulic switch, a fuel tank, an oil pump and said signal cylinder. The switch according to claim 20, wherein the signal cylinder, the accumulator and the oil pump are located on one side of the first valve block, and the oil pressure switch and the oil tank are located on the other side of the first valve block. The switch according to claim 21, wherein the working chamber has a rod chamber which is a constant high pressure chamber, and the rodless chamber is a switching chamber which can be switched between a high pressure and a low pressure, and the first valve block is provided for connection work. The passage of the constant high pressure chamber of the cylinder and the main valve, the passage being located on a side of the first valve block adjacent to the signal cylinder.

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