CN112443526A - Circuit breaker, hydraulic control valve and hydraulic operating mechanism - Google Patents
Circuit breaker, hydraulic control valve and hydraulic operating mechanism Download PDFInfo
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- CN112443526A CN112443526A CN202011156166.4A CN202011156166A CN112443526A CN 112443526 A CN112443526 A CN 112443526A CN 202011156166 A CN202011156166 A CN 202011156166A CN 112443526 A CN112443526 A CN 112443526A
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- repulsion
- valve
- pilot valve
- hydraulic control
- pilot
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/24—Power arrangements internal to the switch for operating the driving mechanism using pneumatic or hydraulic actuator
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to a circuit breaker, a hydraulic control valve and a hydraulic operating mechanism, wherein the hydraulic control valve comprises a main valve and a pilot valve, the hydraulic control valve also comprises a repulsion mechanism, the repulsion mechanism is used for acting on a pilot valve core to open the pilot valve, the repulsion mechanism comprises a repulsion plate and a repulsion coil, the repulsion coil is mutually exclusive with the repulsion plate after being electrified, and the repulsion plate acts on the pilot valve core to open the pilot valve. The hydraulic control valve is provided with the repulsion mechanism, the repulsion coil and the repulsion coil of the repulsion mechanism act on the pilot valve core, the repulsion coil of the repulsion mechanism and the repulsion coil repel each other to push the repulsion coil to act, the repulsion coil acts on the pilot valve core to enable the pilot valve core to be opened quickly, the response time of the repulsion mechanism is short, and the problem that the existing hydraulic control valve is slow in response due to the fact that the pilot valve is driven by the power of the lifting electromagnet is solved.
Description
Technical Field
The invention relates to a circuit breaker, a hydraulic control valve and a hydraulic operating mechanism.
Background
The hydraulic operating mechanism is widely applied to a high-voltage circuit breaker, and in the hydraulic operating mechanism, a hydraulic control valve is a component for receiving and converting a control signal by the mechanism, which not only determines the opening and closing positions of the hydraulic operating mechanism, but also greatly influences the opening and closing speed of the hydraulic operating mechanism. The main valve of the existing hydraulic control valve usually adopts a differential valve structure with two positions and three ways, the two positions respectively correspond to the opening position and the closing position of the breaker, and the three oil ports are respectively a normal-high pressure oil port (P port), a normal-low pressure oil port (T port) and a control oil port (Z port).
In general, a main valve of a hydraulic control valve receives a switching command of a control end through an electromagnetic pilot valve. When the closing pilot valve is electrified, the connected oil path is connected, high-pressure oil flows into the main valve control cavity from the high-pressure oil port (P port) through the closing pilot valve, the valve core of the main valve is pushed to move, and closing action of the control valve is realized. Similarly, when the main valve core is at the closing position corresponding to the circuit breaker, after the opening pilot valve is electrified, the connected oil path is connected, the high-pressure oil flows into the normal-low pressure oil port (T port) from the main valve control cavity of the main valve core through the opening pilot valve, and the main valve core moves under the pushing of the high-pressure oil at the end part, so that the opening action of the control valve is realized.
The currently used pilot valve is usually driven by an electromagnet, a typical structure of the currently used pilot valve is shown in fig. 1, the electromagnet comprises a coil 101 and a movable iron core 102, the pilot valve comprises a return spring 201 and a valve core 202, after the coil 101 is electrified, the movable iron core 102 is driven to move to push the valve core 202, so that the pilot valve is opened, after a control command is finished, the valve core 202 is reset under the action of the return spring 201, and an oil chamber is disconnected with the oil chamber again. In practical application, it usually takes 6-7ms from the electrification of the coil 101 to the opening of the valve plug 202, and the switching of the valve plug 202 opening to the main valve plug position usually takes 5-6ms, so that the whole action takes a long time.
Therefore, the current mode of increasing the response time of the hydraulic control valve is basically focused on selecting an electromagnet with higher power, but is limited by the hard regulations that a power grid user cannot open the pilot valve at the upper limit of the power of the electromagnet and at 30% of rated voltage, and the like, and the problem that the hydraulic control valve is relatively short in corresponding time due to the fact that the effect of increasing the power of the electromagnet is poor still exists.
Disclosure of Invention
The invention aims to provide a hydraulic control valve, which is used for solving the technical problem that the current hydraulic control valve has long response time; in addition, the invention also aims to provide a hydraulic operating mechanism using the hydraulic control valve; the invention also aims to provide a circuit breaker using the hydraulic control valve.
The hydraulic control valve adopts the following technical scheme:
a main valve including a main valve body and a main valve spool;
the pilot valve comprises a pilot valve core, and the pilot valve core acts to open and close the pilot valve so as to control the action of the main valve core;
the hydraulic control valve further comprises a repulsion mechanism, the repulsion mechanism is used for acting on the pilot valve core to open the pilot valve, the repulsion mechanism comprises a repulsion plate and a repulsion coil, the repulsion coil is mutually exclusive with the repulsion plate after being electrified, and the repulsion plate acts on the pilot valve core to open the pilot valve.
Has the advantages that: the hydraulic control valve is provided with the repulsion mechanism, the repulsion coil and the repulsion coil of the repulsion mechanism act on the pilot valve core, the repulsion coil of the repulsion mechanism and the repulsion coil repel each other to push the repulsion coil to act, the repulsion coil acts on the pilot valve core to enable the pilot valve core to be opened quickly, the response time of the repulsion mechanism is short, and the problem that the response of the hydraulic control valve is slow due to the fact that the power of an electromagnet is increased at present is solved.
Furthermore, the hydraulic control valve comprises an electromagnet, the electromagnet is used for acting on the pilot valve core, and the repulsion plate is in transmission fit with the movable iron core of the electromagnet so as to act on the pilot valve core through the movable iron core or directly act on the pilot valve core; when the pilot valve needs to be opened, the repulsion mechanism and the electromagnet jointly drive the pilot valve core to open the pilot valve.
Has the advantages that: the repulsion plate and the electromagnet act on the pilot valve core together, the response time of the electromagnet is long, the response time of the repulsion plate is short, the attenuation is fast, the acting time of the electromagnet on the pilot valve core is longer than that of the repulsion mechanism on the pilot valve core, the electromagnet can be used for keeping the pilot valve core on for a long time, and the action of the main valve core can be better guaranteed to be in place.
Further, the repulsion plate is arranged on the movable iron core. The repulsion plate is connected with the movable iron core, so that the assembly is convenient.
Furthermore, one end of the movable iron core is used for being matched with the pilot valve core in a pushing mode, and the other end of the movable iron core is connected to the center of the repulsion plate. The acting force of the repulsion plate and the movable iron core on the pilot valve core is collinear, and the stability is good.
Further, the repulsion coil is arranged on the side, back to the movable iron core, of the repulsion plate. The repulsion coil is convenient to install.
Further, repulsion mechanism includes the casing, repulsion coil and repulsion dish all set up in the casing, move the iron core and stretch into in the casing and be connected with repulsion dish, and the casing can protect repulsion coil, improves life.
Further, the main valve is two three-way valves, is equipped with normal low pressure chamber, normal high pressure chamber, main valve working chamber, main valve control chamber in the main valve body, and the main valve body is equipped with the normal high pressure hydraulic fluid port that communicates with normal high pressure chamber, the normal low pressure hydraulic fluid port that communicates with normal low pressure chamber and the working fluid port that communicates main valve working chamber intercommunication and operating mechanism actuating cylinder, and the main valve case has the low pressure operating condition who makes normal low pressure chamber and main valve working chamber intercommunication, still has the high pressure operating condition who makes normal high pressure chamber and main valve working chamber intercommunication, the pilot valve sets up at least two, at least one of them is the separating brake pilot valve, and at least one is closing pilot valve, and separating brake pilot valve is used for communicating normal low pressure chamber and main valve control chamber, and closing pilot valve is used for communicating.
Furthermore, a power supply capacitor is arranged on a power supply loop of the repulsion mechanism, and the repulsion coil is powered by the power supply capacitor. The capacitor power supply is convenient to control and low in cost.
The technical scheme of the hydraulic operating mechanism of the invention is as follows:
the hydraulic pressure operating mechanism includes operating mechanism action hydro-cylinder and hydraulic control valve, and hydraulic control valve includes:
a main valve including a main valve body and a main valve spool;
the pilot valve comprises a pilot valve core, and the pilot valve core acts to open and close the pilot valve so as to control the action of the main valve core;
the hydraulic control valve further comprises a repulsion mechanism, the repulsion mechanism is used for acting on the pilot valve core to open the pilot valve, the repulsion mechanism comprises a repulsion plate and a repulsion coil, the repulsion coil is mutually exclusive with the repulsion plate after being electrified, and the repulsion plate acts on the pilot valve core to open the pilot valve.
Has the advantages that: the hydraulic control valve is provided with the repulsion mechanism, the repulsion coil and the repulsion coil of the repulsion mechanism act on the pilot valve core, the repulsion coil of the repulsion mechanism and the repulsion coil repel each other to push the repulsion coil to act, the repulsion coil acts on the pilot valve core to enable the pilot valve core to be opened quickly, the response time of the repulsion mechanism is short, and the problem that the response of the hydraulic control valve is slow due to the fact that the power of an electromagnet is increased at present is solved.
Furthermore, the hydraulic control valve comprises an electromagnet, the electromagnet is used for acting on the pilot valve core, and the repulsion plate is in transmission fit with the movable iron core of the electromagnet so as to act on the pilot valve core through the movable iron core or directly act on the pilot valve core; when the pilot valve needs to be opened, the repulsion mechanism and the electromagnet jointly drive the pilot valve core to open the pilot valve.
Has the advantages that: the repulsion plate and the electromagnet act on the pilot valve core together, the response time of the electromagnet is long, the response time of the repulsion plate is short, the attenuation is fast, the acting time of the electromagnet on the pilot valve core is longer than that of the repulsion mechanism on the pilot valve core, the electromagnet can be used for keeping the pilot valve core on for a long time, and the action of the main valve core can be better guaranteed to be in place.
Further, the repulsion plate is arranged on the movable iron core. The repulsion plate is connected with the movable iron core, so that the assembly is convenient.
Furthermore, one end of the movable iron core is used for being matched with the pilot valve core in a pushing mode, and the other end of the movable iron core is connected to the center of the repulsion plate. The acting force of the repulsion plate and the movable iron core on the pilot valve core is collinear, and the stability is good.
Further, the repulsion coil is arranged on the side, back to the movable iron core, of the repulsion plate. The repulsion coil is convenient to install.
Further, repulsion mechanism includes the casing, repulsion coil and repulsion dish all set up in the casing, move the iron core and stretch into in the casing and be connected with repulsion dish, and the casing can protect repulsion coil, improves life.
Further, the main valve is two three-way valves, is equipped with normal low pressure chamber, normal high pressure chamber, main valve working chamber, main valve control chamber in the main valve body, and the main valve body is equipped with the normal high pressure hydraulic fluid port that communicates with normal high pressure chamber, the normal low pressure hydraulic fluid port that communicates with normal low pressure chamber and the working fluid port that communicates main valve working chamber intercommunication and operating mechanism actuating cylinder, and the main valve case has the low pressure operating condition who makes normal low pressure chamber and main valve working chamber intercommunication, still has the high pressure operating condition who makes normal high pressure chamber and main valve working chamber intercommunication, the pilot valve sets up at least two, at least one of them is the separating brake pilot valve, and at least one is closing pilot valve, and separating brake pilot valve is used for communicating normal low pressure chamber and main valve control chamber, and closing pilot valve is used for communicating.
Furthermore, a power supply capacitor is arranged on a power supply loop of the repulsion mechanism, and the repulsion coil is powered by the power supply capacitor. The capacitor power supply is convenient to control and low in cost.
The technical scheme of the circuit breaker comprises the following steps:
the circuit breaker includes hydraulic pressure operating mechanism, and hydraulic pressure operating mechanism includes operating mechanism actuating cylinder and hydraulic control valve, and hydraulic control valve includes:
a main valve including a main valve body and a main valve spool;
the pilot valve comprises a pilot valve core, and the pilot valve core acts to open and close the pilot valve so as to control the action of the main valve core;
the hydraulic control valve further comprises a repulsion mechanism, the repulsion mechanism is used for acting on the pilot valve core to open the pilot valve, the repulsion mechanism comprises a repulsion plate and a repulsion coil, the repulsion coil is mutually exclusive with the repulsion plate after being electrified, and the repulsion plate acts on the pilot valve core to open the pilot valve.
Has the advantages that: the hydraulic control valve is provided with the repulsion mechanism, the repulsion coil and the repulsion coil of the repulsion mechanism act on the pilot valve core, the repulsion coil of the repulsion mechanism and the repulsion coil repel each other to push the repulsion coil to act, the repulsion coil acts on the pilot valve core to enable the pilot valve core to be opened quickly, the response time of the repulsion mechanism is short, and the problem that the response of the hydraulic control valve is slow due to the fact that the power of an electromagnet is increased at present is solved.
Furthermore, the hydraulic control valve comprises an electromagnet, the electromagnet is used for acting on the pilot valve core, and the repulsion plate is in transmission fit with the movable iron core of the electromagnet so as to act on the pilot valve core through the movable iron core or directly act on the pilot valve core; when the pilot valve needs to be opened, the repulsion mechanism and the electromagnet jointly drive the pilot valve core to open the pilot valve.
Has the advantages that: the repulsion plate and the electromagnet act on the pilot valve core together, the response time of the electromagnet is long, the response time of the repulsion plate is short, the attenuation is fast, the acting time of the electromagnet on the pilot valve core is longer than that of the repulsion mechanism on the pilot valve core, the electromagnet can be used for keeping the pilot valve core on for a long time, and the action of the main valve core can be better guaranteed to be in place.
Further, the repulsion plate is arranged on the movable iron core. The repulsion plate is connected with the movable iron core, so that the assembly is convenient.
Furthermore, one end of the movable iron core is used for being matched with the pilot valve core in a pushing mode, and the other end of the movable iron core is connected to the center of the repulsion plate. The acting force of the repulsion plate and the movable iron core on the pilot valve core is collinear, and the stability is good.
Further, the repulsion coil is arranged on the side, back to the movable iron core, of the repulsion plate. The repulsion coil is convenient to install.
Further, repulsion mechanism includes the casing, repulsion coil and repulsion dish all set up in the casing, move the iron core and stretch into in the casing and be connected with repulsion dish, and the casing can protect repulsion coil, improves life.
Further, the main valve is two three-way valves, is equipped with normal low pressure chamber, normal high pressure chamber, main valve working chamber, main valve control chamber in the main valve body, and the main valve body is equipped with the normal high pressure hydraulic fluid port that communicates with normal high pressure chamber, the normal low pressure hydraulic fluid port that communicates with normal low pressure chamber and the working fluid port that communicates main valve working chamber intercommunication and operating mechanism actuating cylinder, and the main valve case has the low pressure operating condition who makes normal low pressure chamber and main valve working chamber intercommunication, still has the high pressure operating condition who makes normal high pressure chamber and main valve working chamber intercommunication, the pilot valve sets up at least two, at least one of them is the separating brake pilot valve, and at least one is closing pilot valve, and separating brake pilot valve is used for communicating normal low pressure chamber and main valve control chamber, and closing pilot valve is used for communicating.
Furthermore, a power supply capacitor is arranged on a power supply loop of the repulsion mechanism, and the repulsion coil is powered by the power supply capacitor. The capacitor power supply is convenient to control and low in cost.
Drawings
FIG. 1 is a schematic diagram of a pilot valve and an electromagnet in a prior art;
FIG. 2 is a schematic structural view of a hydraulic control valve according to embodiment 1 of the present invention (the repulsive force mechanism is not shown);
FIG. 3 is a diagram showing the relationship between a pilot valve and an electromagnet in the hydraulic control valve according to embodiment 1 of the present invention;
in fig. 1: 101-a coil; 102-a movable iron core; 201-a return spring; 202-a valve core;
in fig. 2 and 3: 1-a main valve; 11-a main valve body; 111-a normally low pressure chamber; 112-a normal pressure cavity; 113-main valve working chamber; 114-main valve control chamber; 115-normal high pressure oil port; 116-normal and low pressure oil ports; 117-working oil port; 12-a main valve spool; 201-opening the brake pilot valve; 202-a switching-on pilot valve; 21-a pilot valve body; 22-pilot spool; 23-a pilot return spring; 3-an electromagnet; 31-a movable iron core; 32-electromagnet coils; 41-a housing; 42-repulsion coil; 43-repulsive force disk.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Embodiment 1 of the hydraulic control valve of the present invention:
the hydraulic control valve includes a main valve and a pilot valve, wherein the main valve and the pilot valve are both in the prior art, as shown in fig. 2 and fig. 3, the main valve 1 is a two-position three-way valve including a main valve body 11 and a main valve spool 12 disposed in the main valve body 11, the main valve body 11 is provided with a normal-low pressure chamber 111, a normal-high pressure chamber 112, a main valve working chamber 113, and a main valve control chamber 114, the main valve body 11 is provided with a normal-high pressure port 115 (P port) communicated with the normal-high pressure chamber 112, a normal-low pressure port 116 (T port) communicated with the normal-low pressure chamber 111, and a working port 117 (Z port) communicated with the main valve working chamber 113 for supplying oil to the operating mechanism control circuit, the main valve spool 12 has a low pressure working state for communicating the normal-low pressure chamber 111 with the main valve working chamber 113.
When the main valve spool 12 controls the main valve working chamber 113 to communicate with the normal-high pressure chamber 112, the main valve working chamber 113 outputs high-pressure oil to the operating mechanism actuating cylinder through the working port 117, the hydraulic operating mechanism performs a closing operation, when the main valve spool 12 controls the main valve working chamber 113 to communicate with the normal-low pressure chamber 111, the high-pressure oil of the operating mechanism actuating cylinder flows back to the normal-low pressure chamber 111 through the working port 117 and then flows back to the oil tank, and the hydraulic operating mechanism performs a opening operation.
In this embodiment, the main valve spool 12 is controlled by a pilot valve, as shown in fig. 2, two pilot valves are provided, one of the two pilot valves is an opening pilot valve 201, and the other one is a closing pilot valve 202, the opening pilot valve 201 is used for communicating the normal low pressure chamber 111, the main valve control chamber 114 and the main valve working chamber 113, and the closing pilot valve 202 is used for communicating the normal high pressure chamber 112 and the main valve control chamber 114. As shown in fig. 2, when the main valve spool 12 is at the open position corresponding to the breaker, and the close pilot valve 202 is charged, the connected oil path is closed, and high-pressure oil flows from the normal-pressure oil port 115 through the close pilot valve 202 into the main valve control chamber 114 at the right end of the main valve spool 12, and pushes the main valve spool 12 to move leftward, thereby realizing the close operation of the hydraulic control valve. Similarly, when the main valve spool 12 is at the closing position corresponding to the breaker, after the opening pilot valve 201 is electrified, the connected oil path is connected, the high-pressure oil flows from the main valve control chamber 114 at the right end of the main valve spool 12 to the normal-low pressure oil port 116 through the opening pilot valve 201, and the main valve spool 12 moves to the right under the pushing of the high-pressure oil at the left end, thereby realizing the opening operation of the hydraulic control valve.
In order to increase the response speed of the hydraulic pilot valve, the pilot valve is improved in this embodiment, as shown in fig. 3, the pilot valve includes a pilot valve body 21 fixed on a main valve body 11, a pilot valve spool 22 and a pilot return spring 23 are arranged in the pilot valve body 21, the pilot valve spool 22 is operated to open and close the pilot valve to control the operation of the main valve spool 12, an electromagnet 3 is arranged on the pilot valve body 21, the electromagnet 3 includes a movable iron core 31 and an electromagnet coil 32, the movable iron core 31 is used for being in pushing fit with the pilot valve spool 22 to push the pilot valve spool 22 to open the pilot valve, and the pilot valve maintained after being opened is in a conducting state until the operation of the main valve spool.
In order to increase the response speed of the hydraulic control valve, the hydraulic control valve in this embodiment includes a repulsion mechanism, the repulsion mechanism includes a housing 41, a repulsion coil 42 and a repulsion disk 43 are disposed in the housing 41, the repulsion disk 43 is a metal disk, the repulsion coil 42 is connected to a power supply loop, and a power supply capacitor C is connected in series to the power supply loop.
The repulsive force disc 43 and the repulsive force coil 42 are arranged in the moving direction of the pilot spool 22, wherein the repulsive force coil 42 is provided on the side of the repulsive force disc 43 facing away from the pilot spool 22. One end of the movable iron core 31 extends into the housing 41, the repulsive force disc 43 is fixed at one end of the movable iron core 31 extending into the housing 41, and the other end of the movable iron core 31 is a pushing matching end in pushing matching with the pilot valve core 22. In this embodiment, the repulsion plate 43 is a circular plate, the center of the repulsion plate 43 is fixed at the end of the movable iron core 31, and the coil of the movable iron core 31 and the repulsion coil 42 are arranged along the extending direction of the movable iron core 31, so that the electromagnet 3 and the repulsion force mechanism are collinear.
When a brake opening command or a brake closing command is sent, the electromagnet coil 32 is electrified, the switch K connected with the repulsion coil 42 is closed, and the power supply capacitor C starts to electrify the repulsion coil 42, a reverse induced current is generated in the repulsion coil 43 due to severe current change, a huge repulsion force is generated between the repulsion coil 42 and the repulsion coil 43 to push the repulsion coil 43 to move, and the repulsion coil 43 pushes the movable iron core 31 to move to open the pilot valve. Because the repulsion plate 43 can move for 2-3ms under the action of repulsion force, the pilot valve can be quickly opened within 2-3ms, and the time for opening the pilot valve is shortened by 4-5ms compared with the prior art that the pilot valve is opened by only depending on 6-7ms of the electromagnet coil 32.
Before the main valve core 12 is switched in place, the pilot valve core 22 needs to be kept in an open state all the time, the repulsion force of the repulsion force mechanism is very fast due to the characteristics of the repulsion force mechanism, the attenuation is very fast, the action time of the electromagnet on the pilot valve core is longer than that of the repulsion force mechanism on the pilot valve core, after the repulsion force of the repulsion force mechanism and the electromagnet jointly act to open the pilot valve core, the electromagnet still can keep the action on the pilot valve core after the repulsion force of the repulsion force mechanism is attenuated, so that the pilot valve is kept in a certain open time, and the pilot valve can be kept in a conducting state through. The pilot valve core 22 is opened quickly by means of the pushing force provided by the repulsive force disc 43, and when the repulsive force subsides, the position can be kept by means of the magnetic force provided by the electromagnet coil 32 until the control command is finished after the main valve core 12 moves to the right position.
Because the repulsion plate 43 is required to have a short stroke, the repulsion device and the capacitor for supplying power to the repulsion device can be made smaller, and the volume of the hydraulic operating mechanism is not influenced obviously. The main structure of the main valve 1 and the pilot valve of the hydraulic control valve of the invention is not changed, and the structure is simple.
Embodiment 2 of the hydraulic control valve of the present invention, the hydraulic control valve of this embodiment is different from the structure described in embodiment 1 only in that the plunger is directly connected to the valve core of the pilot valve.
Embodiment 4 of the hydraulic control valve of the present invention is different from the structure described in embodiment 1 only in that a cross bar extending perpendicular to the moving direction of the pilot valve is provided on the part of the pilot valve core extending out of the valve body, two acting points are provided on the cross bar, one of which is engaged with the movable iron core and driven by an electromagnet, and the other is provided with a repulsion disk and driven by a repulsion mechanism.
Embodiment 5 of the hydraulic control valve of the present invention, the hydraulic control valve of this embodiment is different from the structure described in embodiment 1 only in that the repulsion disk is in pushing fit with the plunger, and the repulsion disk is slidably mounted in the housing along the moving direction of the plunger. In other embodiments, the repulsion plate may also be provided with other pushing structures such as a push rod, etc. in pushing cooperation with the movable iron core, or certainly, the pushing structure may also be provided in pushing cooperation with the pilot valve core.
Embodiment 6 of the hydraulic control valve of the present invention is different from the structure described in embodiment 1 only in that in this embodiment, the pilot valve element is acted only by the repulsive force mechanism, and no electromagnet is needed, and since the response time of the repulsive force mechanism is short, the damping channel can be increased to increase the time for the pilot valve element to be reset to close the pilot valve. In other embodiments, the parameters of the repulsion mechanism may also be adjusted to increase the duration of the repulsion mechanism.
In other embodiments, the repulsion mechanism may be exposed, and the housing of the repulsion mechanism may be replaced by a fixing frame.
In other embodiments, the main valves and the pilot valves may be those in CN106783422B, and the number of pilot valves may be adjusted as required.
In the specific embodiment of the hydraulic operating mechanism of the present invention, the hydraulic operating mechanism includes an operating mechanism actuating cylinder and a hydraulic control valve, and the hydraulic control valve has the same structure as the hydraulic control valve described in any of the specific embodiments described above, and details are not repeated.
In a specific embodiment of the circuit breaker of the present invention, the circuit breaker includes a switch body and a hydraulic operating mechanism, the hydraulic operating mechanism includes an operating mechanism actuating cylinder and a hydraulic control valve, and the hydraulic control valve has the same structure as the hydraulic control valve described in any one of the specific embodiments, and details thereof are not repeated.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. A hydraulic control valve comprising:
a main valve including a main valve body and a main valve spool;
the pilot valve comprises a pilot valve core, and the pilot valve core acts to open and close the pilot valve so as to control the action of the main valve core;
it is characterized in that the preparation method is characterized in that,
the hydraulic control valve further comprises a repulsion mechanism, the repulsion mechanism is used for acting on the pilot valve core to open the pilot valve, the repulsion mechanism comprises a repulsion plate and a repulsion coil, the repulsion coil is mutually exclusive with the repulsion plate after being electrified, and the repulsion plate acts on the pilot valve core to open the pilot valve.
2. The hydraulic control valve of claim 1, wherein the hydraulic control valve includes an electromagnet for acting on the pilot valve spool, the repulsion disk being in driving engagement with a plunger of the electromagnet to act on the pilot valve spool through the plunger, or the repulsion disk acting directly on the pilot valve spool;
when the pilot valve needs to be opened, the repulsion mechanism and the electromagnet jointly drive the pilot valve core to open the pilot valve.
3. The hydraulic control valve of claim 2, wherein the repulsive disc is provided on a plunger.
4. A hydraulic control valve according to claim 3 wherein one end of the plunger is adapted for positive displacement engagement with the pilot valve element and the other end of the plunger is connected to the center of the repulsive force plate.
5. The hydraulic control valve of claim 4, wherein the repulsion coil is disposed on a side of the repulsion plate facing away from the plunger.
6. The hydraulic control valve of claim 5, wherein the repulsion mechanism includes a housing, the repulsion coil and the repulsion disk are both disposed in the housing, and the plunger extends into the housing and is connected to the repulsion disk.
7. Hydraulic control valve according to any of claims 1 to 6, the main valve is a two-position three-way valve, a normal low pressure cavity, a normal high pressure cavity, a main valve working cavity and a main valve control cavity are arranged in a main valve body of the main valve, a normal high pressure oil port communicated with the normal high pressure cavity, a normal low pressure oil port communicated with the normal low pressure cavity and a working oil port communicated with the main valve working cavity and communicated with an operating mechanism actuating oil cylinder are arranged on the main valve body of the main valve, a main valve core of the main valve has a low pressure working state enabling the normal low pressure cavity to be communicated with the main valve working cavity and also has a high pressure working state enabling the normal high pressure cavity to be communicated, at least one of the two-way valve is an opening pilot valve and at least one of the two-way valve is a closing pilot valve, the opening pilot valve is used for communicating the normal-low pressure cavity with the main valve control cavity, and the closing pilot valve is used for communicating the normal-high pressure cavity with the main valve control cavity.
8. A hydraulic control valve according to any one of claims 1 to 6 wherein the repulsion mechanism has a supply capacitor in its supply circuit and the repulsion coil is supplied with power from the supply capacitor.
9. A hydraulic actuator comprising an actuator cylinder and a hydraulic control valve, wherein the hydraulic control valve is the hydraulic control valve of any one of claims 1-8.
10. A circuit breaker comprising a hydraulic operating mechanism including an operating mechanism actuator cylinder and a hydraulic control valve, wherein the hydraulic control valve is according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011156166.4A CN112443526B (en) | 2020-10-26 | 2020-10-26 | Circuit breaker, hydraulic control valve and hydraulic operating mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011156166.4A CN112443526B (en) | 2020-10-26 | 2020-10-26 | Circuit breaker, hydraulic control valve and hydraulic operating mechanism |
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| CN112443526A true CN112443526A (en) | 2021-03-05 |
| CN112443526B CN112443526B (en) | 2023-09-29 |
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| CN112443526B (en) | 2023-09-29 |
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