CN115388056A - Pressure trigger type pilot-operated switch valve - Google Patents
Pressure trigger type pilot-operated switch valve Download PDFInfo
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- CN115388056A CN115388056A CN202210808954.XA CN202210808954A CN115388056A CN 115388056 A CN115388056 A CN 115388056A CN 202210808954 A CN202210808954 A CN 202210808954A CN 115388056 A CN115388056 A CN 115388056A
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- 239000003921 oil Substances 0.000 claims description 268
- 230000003068 static effect Effects 0.000 claims description 36
- 239000010720 hydraulic oil Substances 0.000 claims description 17
- 230000001960 triggered effect Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000005672 electromagnetic field Effects 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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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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- 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
- F15B13/01—Locking-valves or other detent i.e. load-holding devices
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Abstract
The invention provides a pressure trigger type pilot-operated switch valve, wherein a pressure trigger cavity of a pressure trigger is arranged in an electromagnet device of the switch valve, the pressure trigger is arranged in an oil cavity of a pilot valve and slides left and right to form a hydraulic lock cavity at the position of the pressure trigger, a load cavity B at the left side of the pressure trigger and a load cavity F at the right side of the pressure trigger, the pressure trigger cavity can be communicated with the hydraulic lock cavity when the pressure trigger slides, an electric control signal of the switch valve is linked with the switch valve through a pressure signal, and the starting condition of the pressure trigger is associated with the power-on state of an electromagnet of the switch valve; the opening condition of the switch valve is associated with the equilibrium state of the left side pressure and the right side pressure of the pressure trigger; the invention can ensure that the switch valve can be opened only after the pressure difference between the front end and the rear end of the valve port of the switch valve is reduced by controlling the linkage structure of the pressure trigger and the electromagnet, thereby avoiding the condition that the valve port pressure difference is not reduced and the switch valve is opened to cause larger valve port throttling loss.
Description
Technical Field
The invention relates to the technical field of switch hydraulic sources, in particular to a pressure trigger type pilot-operated switch valve.
Background
With the great trend of energy conservation and emission reduction to global industrial development, the hydraulic industry is continuously developed towards green and efficient directions under the influence of the energy conservation and emission reduction, one of the main manifestations is the development of the digital hydraulic field in recent years, and the switching hydraulic source technology is one of the cores of the development.
In the conventional switching hydraulic source technology, a switching valve is controlled by using a Pulse Width Modulation (PWM) technology, so that the energy stored in a flywheel of a hydraulic sensor element such as a hydraulic motor with the flywheel can be periodically released to an output end of a system, or the energy stored in the system energy source can be periodically stored in the flywheel, and the periodic charging and discharging energy can obtain the effect similar to the PWM voltage regulation in the power electronic technology, thereby achieving the purpose of increasing and decreasing the voltage of the system.
The work flow of the switching hydraulic source is summarized as follows: one end of a liquid induction motor with a flywheel is connected to a hydraulic oil source, and the other end of the liquid induction motor is respectively connected to an oil tank oil source and a load end through two switch valves; when an oil source switch valve of an oil tank is opened and a load end switch valve is closed, the pressures at two ends of a liquid sensing motor with a flywheel are unbalanced, the pressure of a hydraulic oil source is greater than the pressure of the oil source of the oil tank, and the liquid sensing motor with the flywheel starts to accelerate; when the flywheel in the liquid induction motor with the flywheel stores certain energy through accelerated rotation, the oil source switch valve of the oil tank is closed, the load end switch valve is opened, and at the moment, hydraulic oil supplied to the load end is supplied by a hydraulic oil source and the liquid induction motor with the flywheel in series; at this time, the hydraulic motor with the flywheel corresponds to a hydraulic pump, and therefore the supply pressure at the load end is greater than the pressure of the hydraulic oil source, and the pressure is increased.
However, in the boosting process, pressure difference exists before and after the opening of the valve port of the switching valve at the load end, so that throttling loss exists in the opening and closing processes of the switching valve, and the transformation efficiency of the switching hydraulic source is influenced.
In order to further improve the transformation efficiency of switching hydraulic sources, hydraulic soft switching technology has emerged in recent years. The hydraulic soft switch is realized by connecting an energy accumulator and a one-way valve in parallel in front of a switch valve at a load end. In the switch hydraulic source loop, when the oil tank oil source end switch valve is closed, the front end oil path of the load end switch valve is switched from the oil tank oil source to the pressure oil source, and the pressure of the front end oil path of the load end switch valve rises at the moment because the pressure oil source is connected in series with the liquid induction motor with the flywheel. When the pressure at the front end of the valve port of the load-end switch valve rises to exceed the pressure at the rear end of the valve port, the one-way valve connected with the switch valve in parallel is pushed open, so that the front end and the rear end of the valve port of the switch valve are connected, the pressure difference between the front end and the rear end of the valve port of the switch valve is minimum, the switch valve can be opened with small throttling loss, and the energy accumulator is used for temporarily storing part of oil which passes through the switch valve which is not completely opened in the opening process of the switch valve. For example, chinese patent No. CN202110557022.8 discloses a hydraulic soft switching transformer for realizing pressure rise and drop, which absorbs and shunts part of oil through an energy accumulator and a check valve connected in parallel to a bypass oil path of four switching valves, so as to reduce the oil passing through the switching valves which are not completely opened, thereby reducing throttling loss.
However, the hydraulic circuit controlled by the switch valve has the disadvantages that: the minimum throttling loss can be realized only by opening the switch valve when the front-back pressure difference of the valve port of the switch valve is minimum, and if the switch valve cannot be opened at the most proper time node, the opening of the switch valve can bring large throttling loss. Therefore, the HYDRAULIC circuit IN the field of HYDRAULIC SOFT switches has a high requirement on the opening and closing time nodes and the opening and closing sequence of the switch, for example, IN a HYDRAULIC SOFT switch circuit proposed IN the paper "SOFT SWITCH IN SWITCH INANCED HYDRAULIC CICUITS" published by the Proceedings of the BATH/ASME 2016 Symposium on Fluid Power and Motion Control IN 2016, the load end switch valve and the oil tank end switch valve are matched IN an opening and closing mode, so that the shared energy accumulator arranged at the front ends of the load end switch valve and the oil tank end switch valve can be periodically charged and discharged, pressure resonance IN front of the switch valve is caused, and low-pressure-difference opening of the switch valve is achieved. Therefore, the opening and closing control signal of the switching valve is required to be designed according to the pressure resonance change condition of the energy accumulator, the switching valve is opened when the pressure difference between the front end and the rear end of the valve port of the switching valve is minimum, and if external interference exists, the system cannot open and close the switching valve according to a correct time sequence, the hydraulic soft switching device cannot reduce the throttling loss when the switching valve is opened and closed, and on the contrary, the pressure at the front end of the valve port of the switching valve abnormally fluctuates due to incorrect charging and discharging energy of the energy accumulator, so that larger throttling loss is caused.
Therefore, the switch valve which can combine the pressure signals in front of and behind the valve port of the switch valve with the electric control signals of the electromagnet of the switch valve to realize linkage control is an urgent need in the field of hydraulic soft switching.
Disclosure of Invention
The invention provides a pressure trigger type pilot-operated switch valve which can be opened only after the pressure difference between the front end and the rear end of a valve port of the switch valve is reduced by controlling a linkage structure of a pressure trigger and an electromagnet, and avoids the condition that the valve port is opened without reducing the pressure difference, so that the larger valve port throttling loss is caused.
The invention adopts the following technical scheme.
A pressure trigger type pilot-operated switch valve is characterized in that a pressure trigger cavity of a pressure trigger is arranged in an electromagnet device of the switch valve, the pressure trigger is arranged in an oil cavity of a pilot valve and slides left and right to form a hydraulic lock cavity at the position of the pressure trigger, a load cavity B on the left side of the pressure trigger and a load cavity F on the right side of the pressure trigger, the pressure trigger cavity can be communicated with the hydraulic lock cavity when the pressure trigger slides, an electric control signal of the switch valve is linked with a pressure signal of the switch valve, and the starting condition of the pressure trigger is associated with the power-on state of an electromagnet of the switch valve; the open condition of the switching valve is associated with the equilibrium state of the left and right pressures of the pressure trigger.
The switch valve comprises a working loop, a switch valve body (17), a switch valve upper cover (5), a pilot valve cover (3), a pilot valve body (1) and a pressure trigger (2) arranged inside the pilot valve body (1);
the working loop comprises a load end oil path and a load end oil path, and an oil source of the load end oil path is periodically switched between a pressure oil source and an oil source of an oil tank according to the working requirement of the current working loop; the pressure oil source is a high-pressure oil source of a switch valve; the oil source of the oil tank is a low-pressure oil source of a switch valve;
one end of the load end oil way is connected with a load end connecting hole (K) of the switch valve body (17), and the other end of the load end oil way is connected with a load end pressure hole (A) at the left end of the pilot valve body (1);
one end of the loading end oil way is connected with a loading end connecting hole (L) of the switch valve body (17), and the other end of the loading end oil way is connected with a loading end pressure hole (I) at the right end of the pilot valve bonnet (3);
the pilot valve body (1) is connected with an oil tank oil way through an unloading hole (H), and the pilot valve body (1) is connected with a pressure trigger containing cavity (J) in the switch valve body (17) through a trigger oil way (G).
A main valve core (16) is arranged at the valve body (17) part of the switch valve, a movable armature (12) of a switch valve electromagnet is arranged in the middle of the main valve core (16), and a piston (9) is arranged at the tail end of the main valve core (16); the piston (9) is arranged in a static armature (11) of the switch valve electromagnet, a spring (6) is arranged in the static armature (11), a magnetic resistance sleeve (7) is arranged around the static armature (11), and an electromagnetic coil (8) is arranged around the magnetic resistance sleeve (7); static armature (11), piston (9), spring (6), hinder magnetic sleeve (7), solenoid (8) set up in ooff valve upper cover (5), ooff valve upper cover (5) enclose into pressure jointly with static armature (11), piston (9) and trigger and hold chamber (J), pressure trigger holds the inside hydraulic oil that is full of chamber (J).
The pilot valve body (1) is a hollow column, and a load end pressure hole (A) is formed in the left end face of the pilot valve body; a trigger oil way (G) is arranged in the middle of the lower side of the pilot valve body (1), and an unloading hole (H) is arranged at the right end of the trigger oil way (G); the right end face of the pilot valve body (1) is a matching face of the left end face of the pilot valve cover (3), and a screw hole is formed in the matching face; the right end surface of the inner side of the pilot valve cover (3) is a cylindrical concave platform; and a loading end pressure hole (I) is formed in the lower end of the pilot valve cover (3).
The pilot valve body (1) and the left end face of the pressure trigger (2) form a load containing cavity (B); the middle parts of the pilot valve body (1) and the pressure trigger (2) form a hydraulic lock containing cavity (E); the pilot valve cover (3) and the right end face of the pressure trigger (2) form a loading cavity (F).
The pilot valve body is a hollow cylinder, the inside left end face of the hollow cylinder is a cylindrical concave table for setting a load end pressure hole, the right end face of the pilot valve body is a fitting surface of the left end face of the pilot valve cover, and screw holes are formed in the fitting surface.
The pressure trigger (2) is a cylinder with an H-shaped section along the axis, an annular oil way (C) is processed at the left end of the pressure trigger (2), and a pressure trigger oil way (D) is processed inside the pressure trigger (2); an opening hole connected with a pressure signal oil way (D) is formed in the annular oil way (C), and an oil way formed by the pressure signal oil way (D) and the inner opening hole of the annular oil way (C) is an L-shaped section oil way; the right end of the pressure signal oil way (D) is provided with a hole on the right end surface of the pressure trigger (2); the pressure trigger (2) can move left and right in a cavity formed by the pilot valve body (1) and the pilot valve cover (3).
The upper end of the pressure trigger accommodating cavity (J) is provided with an opening which is communicated with a trigger oil way (G) at the lower end of the pilot valve body (1), and the trigger oil way (G) is communicated with the pressure trigger accommodating cavity (J) through the opening to form a hydraulic lock of the main valve of the switch valve.
A magnet-resisting ring (15) is arranged in a groove on the upper end surface of the switch valve body (17), and the magnet-resisting ring (15) is of a concave annular structure; a magnetic conduction ring (13) is arranged on the concave annular surface of the magnetic resistance ring (15);
a closed-loop magnetic circuit is formed among the switch valve upper cover (5), the magnetic conduction ring (13), the movable armature (12) and the static armature (11).
A working method of a pressure trigger type pilot operated switch valve adopts the pressure trigger type pilot operated switch valve, and comprises the following steps;
step S1: a pressure trigger type pilot-operated switch valve opening preparation stage: the pressure trigger (2) is arranged in the pilot valve body (1), the right end face of the pressure trigger (2) is tightly attached to the pilot valve cover (3), the pressure trigger (2) blocks a loading end pressure hole (I) at the lower end of the pilot valve cover (3), a left end annular oil way (C) of the pressure trigger (2) is communicated with a trigger oil way (G) at the lower end of the pilot valve body (1), and the trigger oil way (G) is communicated with a pressure trigger accommodating cavity (J) through an opening at the upper end of the pressure trigger accommodating cavity (J);
step S2: the pressure trigger type pilot-operated switch valve is opened in the first stage: when a load end oil path is switched from an oil source of an oil tank to a pressure oil source, and meanwhile, a solenoid coil (8) is subjected to high-pressure excitation, so that current in the solenoid coil (8) rises, an electromagnetic field generated by the solenoid coil (8) forms a closed-loop magnetic circuit among an upper cover (5) of a switch valve, a magnetic conductive ring (13), a movable armature (12) and a static armature (11), so that the static armature (11) attracts the movable armature (12) to move upwards and drives a main valve spool (16) to move upwards, the main valve spool (16) drives a piston (9) at the upper end of the main valve spool (16) to move upwards, hydraulic oil in a pressure trigger accommodating cavity (J) sequentially passes through a trigger oil path (G) -annular oil path (C) -pressure signal oil path (D) to a cylindrical concave table on the inner end surface of the right side of a pilot valve cover (3) and pushes a pressure trigger (2) to move leftwards;
and step S3: and a second stage of opening the pressure trigger type pilot-operated switch valve: when the pressure trigger (2) moves to a certain stroke leftwards, the connection between the left end annular oil way (C) of the pressure trigger (2) and the pressure trigger accommodating cavity (J) is cut off through the trigger oil way (G), meanwhile, the loading end pressure hole (I) blocked by the pressure trigger (2) at the lower end of the pilot valve cover (3) is opened to be communicated with the loading end oil way, when the oil pressure of the loading end oil way is smaller than that of the loading end oil way, the pressure trigger (2) is pushed back rightwards until the oil pressure of the loading end oil way is larger than that of the loading end oil way, and the pressure trigger (2) is further pushed leftwards;
and step S4: the third stage of the pressure trigger type pilot-operated switch valve is opened: when the pressure trigger (2) moves leftwards continuously to a preset stroke, the pressure trigger cavity (J) is connected to an oil tank oil circuit sequentially through a trigger oil circuit (G), a hydraulic lock cavity (E) and an unloading hole (H), at the moment, hydraulic oil in the pressure trigger cavity (J) is unloaded, a main valve hydraulic lock of the switch valve is released, the movable armature (12) is further attracted by the static armature (12) to move upwards under the action of a magnetic field of the electromagnetic coil (8), and a valve core (16) of the main valve is driven to move upwards, so that the main valve of the switch valve is completely opened;
step S5: a pressure triggering type pilot-operated switch valve closing stage: when the electromagnetic coil (8) is de-energized, an electromagnetic field disappears, attraction force between the movable armature (12) and the static armature (13) disappears, the piston (9) moves downwards under the action of the spring (6), the piston (9) drives oil to make the oil be replenished to the pressure trigger containing cavity (J) from an oil tank oil way, meanwhile, the piston (9) drives the main valve spool (16) to return to a closing position of the switch valve, when a load end oil way is switched from a pressure oil source to an oil tank oil source, the pressure of a load containing cavity (B) on the left side of the pilot valve body (1) is larger than the pressure of a load containing cavity (F) on the right side of the pilot valve cover (3), and the pressure trigger is pushed back to the rightmost end of the pilot valve cover;
step S6: the steps S1 to S5 are repeated, and the linkage structure of the pressure trigger and the electromagnet is controlled to ensure that the switching valve can be opened only after the pressure difference between the front end and the rear end of the valve port of the switching valve is reduced, so that the condition that the switching valve is opened without reducing the pressure difference of the valve port is avoided, and the larger valve port throttling loss is caused.
The invention has the beneficial effects that:
1) The invention adopts the electric control signal and the pressure signal as the trigger signal for the secondary opening of the switch valve, thereby obviously reducing the throttling loss of the valve port and improving the working efficiency of the switch valve. The pressure triggering cavity arranged in the electromagnet is used for linking the electric control signal and the pressure signal of the switch valve. Whether the switch valve electromagnet is electrified or not is used as a starting condition of the pressure trigger; whether the front pressure and the rear pressure of the pressure trigger are balanced or not is used as the opening condition of the switch valve, the switch valve is ensured to be opened when the front pressure difference and the rear pressure difference of the valve port are lower, and the working efficiency of the switch valve is improved.
2) The hydraulic lock mechanism formed by the closed containing cavities ensures the accuracy of the two-stage opening sequence of the switch valve and improves the working reliability of the switch valve. When the switch valve electromagnet is not electrified, the hydraulic lock mechanism is in a locking state, even if pressure fluctuation exists outside, the electromagnetic valve can be ensured to be in a closing state, and the pressure trigger is not triggered. The switch valve can be opened only when the switch valve receives the electric control signal and the front and back pressure of the valve port meets the opening condition, so that the accuracy, the applicability and the fault tolerance of the opening time sequence of the switch valve are ensured.
3) The pressure trigger mechanism designed by the invention can meet the working requirement only by acquiring the pressure signal and shunting a small amount of flow of the main oil way, and reduces the influence on the system due to the addition of the pilot part of the switch valve.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a left side schematic view of the present invention;
FIG. 2 isbase:Sub>A schematic cut-away view of section A-A of FIG. 1;
FIG. 3 is another cutaway schematic view of section A-A of FIG. 2;
FIG. 4 is a schematic bottom view of the present invention;
FIG. 5 is a schematic sectional view taken along section B-B of FIG. 4;
fig. 6 is a schematic view of the pressure-triggered pilot operated switch valve in the initial state in step S1;
FIG. 7 is a schematic diagram illustrating the switching of the load-side oil path from the tank oil source to the pressure oil source in step S2;
FIG. 8 is a schematic view of the pressure trigger being moved to the far left by the hydraulic pressure in step S3;
in the figure: 1-a pilot valve body; 2-a pressure trigger; 3-a pilot valve cover; 4-pilot valve sealing ring; 5, opening and closing the valve upper cover; 6-a spring; 7-magnetic resistance sleeve; 8-a solenoid coil; 9-a piston; 10-piston seal ring; 11-a static armature; 12-a moving armature; 13-a magnetically conductive ring; 14-a switching valve seal ring; 15-a magnetic resistance ring; 16-a main valve spool; 17-a switching valve body;
a-a load end pressure port; b-a load chamber; c-annular oil way; d-pressure signal oil circuit; e-a hydraulic lock chamber; an F-loading chamber; g-trigger oil circuit; an H-relief hole; i-a loading end pressure port; a J-pressure trigger chamber; k-load end connection hole; l-loading end connection hole.
Detailed Description
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in the figure, a pressure trigger type pilot operated switch valve is characterized in that a pressure trigger cavity of a pressure trigger is arranged in an electromagnet device of the switch valve, the pressure trigger is arranged in an oil cavity of a pilot valve and slides left and right to form a hydraulic lock cavity at the position of the pressure trigger, a load cavity B on the left side of the pressure trigger and a load cavity F on the right side of the pressure trigger, the pressure trigger cavity can be communicated with the hydraulic lock cavity when the pressure trigger slides, an electric control signal of the switch valve is linked with the switch valve through a pressure signal, and the starting condition of the pressure trigger is associated with the power-on state of an electromagnet of the switch valve; the open condition of the switching valve is associated with the equilibrium state of the left and right pressures of the pressure trigger.
The switch valve comprises a working loop, a switch valve body 17, a switch valve upper cover 5, a pilot valve cover 3, a pilot valve body 1 and a pressure trigger 2 arranged in the pilot valve body 1;
the working circuit comprises a load end oil circuit and a load end oil circuit, and an oil source of the load end oil circuit is periodically switched between a pressure oil source and an oil source of an oil tank according to the working requirement of the current working circuit; the pressure oil source is a high-pressure oil source of a switch valve; the oil source of the oil tank is a low-pressure oil source of a switch valve;
one end of the load end oil path is connected with a load end connecting hole K of the switch valve body 17, and the other end of the load end oil path is connected with a load end pressure hole A at the left end of the pilot valve body 1;
one end of the loading end oil path is connected with a loading end connecting hole L of the switch valve body 17, and the other end of the loading end oil path is connected with a loading end pressure hole I at the right end of the pilot valve cover 3;
the pilot valve body 1 is connected with an oil tank oil way through an unloading hole H, and the pilot valve body 1 is connected with a pressure trigger cavity J in the switch valve body 17 through a trigger oil way G.
A main valve core 16 is arranged at the valve body 17 part of the switch valve, a movable armature 12 of a switch valve electromagnet is arranged in the middle of the main valve core 16, and a piston 9 is arranged at the tail end of the main valve core 16; the piston 9 is arranged in a static armature 11 of the switch valve electromagnet, a spring 6 is arranged in the static armature 11, a magnetic resistance sleeve 7 is arranged around the static armature 11, and an electromagnetic coil 8 is arranged around the magnetic resistance sleeve 7; the static armature 11, the piston 9, the spring 6, the magnetic resistance sleeve 7 and the electromagnetic coil 8 are arranged in the switch valve upper cover 5, the static armature 11 and the piston 9 jointly enclose a pressure trigger containing cavity J, and the pressure trigger containing cavity J is filled with hydraulic oil.
The pilot valve body 1 is a hollow column, and a load end pressure hole A is formed in the left end face of the pilot valve body; a trigger oil way G is arranged in the middle of the lower side of the pilot valve body 1, and an unloading hole H is formed in the right end of the trigger oil way G; the right end face of the pilot valve body 1 is a matching surface of the left end face of the pilot valve cover 3, and a screw hole is formed in the matching surface; the right end surface of the inner side of the pilot valve cover 3 is a cylindrical concave platform; and, the lower extreme that is located pilot valve gap 3 is equipped with loading end pressure hole I.
The pilot valve body 1 and the left end face of the pressure trigger 2 form a load cavity B; the middle parts of the pilot valve body 1 and the pressure trigger 2 form a hydraulic lock containing cavity E; the pilot valve cover 3 and the right end face of the pressure trigger 2 form a loading cavity F.
The pilot valve body is a hollow cylinder, the inside left end face of the hollow cylinder is a cylindrical concave table for setting a load end pressure hole, the right end face of the pilot valve body is a fitting surface of the left end face of the pilot valve cover, and screw holes are formed in the fitting surface.
The pressure trigger 2 is a cylinder with an H-shaped section along the axial line, an annular oil way C is processed at the left end of the pressure trigger 2, and a pressure trigger oil way D is processed inside the pressure trigger 2; an opening connected with a pressure signal oil way D is formed in the annular oil way C, and an oil way formed by the pressure signal oil way D and the inner opening of the annular oil way C is an oil way with an L-shaped section; the right end of the pressure signal oil path D is provided with a hole on the right end face of the pressure trigger 2; the pressure trigger 2 can move left and right in a cavity body formed by the pilot valve body 1 and the pilot valve cover 3.
The upper end of the pressure trigger containing cavity J is provided with an opening which is communicated with a trigger oil path G at the lower end of the pilot valve body 1, and the trigger oil path G is communicated with the pressure trigger containing cavity J through the opening to form a hydraulic lock of a main valve of the switch valve.
A magnet-resisting ring 15 is arranged in a groove on the upper end surface of the switch valve body 17, and the magnet-resisting ring 15 is of a concave annular structure; a magnetic conduction ring 13 is arranged on the concave annular surface of the magnetic resistance ring 15;
a closed-loop magnetic circuit is formed among the switch valve upper cover 5, the magnetic conductive ring 13, the movable armature 12 and the static armature 11.
A working method of a pressure trigger type pilot operated switch valve adopts the pressure trigger type pilot operated switch valve, and comprises the following steps;
step S1: a pressure trigger type pilot-operated switch valve opening preparation stage: the right end face of a pressure trigger 2 arranged in the pilot valve body 1 is tightly attached to the pilot valve cover 3, a loading end pressure hole I positioned at the lower end of the pilot valve cover 3 is blocked by the pressure trigger 2, a left end annular oil way C of the pressure trigger 2 is communicated with a trigger oil way G at the lower end of the pilot valve body 1, and the trigger oil way G is communicated with a pressure trigger containing cavity J through an opening at the upper end of the pressure trigger containing cavity J;
step S2: the pressure triggering type pilot-operated switch valve opens the first stage: when a load end oil path is switched from an oil source of an oil tank to a pressure oil source, and simultaneously, the electromagnetic coil 8 is subjected to high-pressure excitation to enable the current in the electromagnetic coil 8 to rise, an electromagnetic field generated by the electromagnetic coil 8 forms a closed-loop magnetic circuit among the upper cover 5 of the switch valve, the magnetic conductive ring 13, the movable armature 12 and the static armature 11, so that the static armature 11 attracts the movable armature 12 to move upwards and simultaneously drives the main valve core 16 to move upwards, the main valve core 16 drives the piston 9 at the upper end of the main valve core 16 to move upwards, hydraulic oil in the pressure trigger accommodating cavity J is sequentially transmitted to a cylindrical concave table on the inner end face of the right side of the pilot valve cover 3 through the trigger oil path G-annular oil path C-pressure signal oil path D, and the pressure trigger 2 is pushed to move leftwards;
and step S3: and a second stage of opening the pressure trigger type pilot-operated switch valve: when the pressure trigger 2 moves leftwards to a certain stroke, the connection between the left end annular oil path C of the pressure trigger 2 and the pressure trigger accommodating cavity J is cut off through the trigger oil path G, meanwhile, the loading end pressure hole I blocked by the pressure trigger 2 at the lower end of the pilot valve cover 3 is opened to be communicated with the loading end oil path, when the oil pressure of the loading end oil path is smaller than that of the loading end oil path, the pressure trigger 2 is pushed back rightwards until the oil pressure of the loading end oil path is larger than that of the loading end oil path, and the pressure trigger 2 is further pushed leftwards;
and step S4: a third stage of opening the pressure-triggered pilot-operated switch valve: when the pressure trigger 2 moves leftwards continuously to a preset stroke, the pressure trigger cavity J is connected to an oil tank oil circuit sequentially through a trigger oil circuit G, a hydraulic lock cavity E and an unloading hole H, at the moment, hydraulic oil in the pressure trigger cavity J is unloaded, a main valve hydraulic lock of the switch valve is released, the movable armature 12 is further attracted by the static armature 12 to move upwards under the action of a magnetic field of the electromagnetic coil 8 and drives a valve core 16 of the main valve to move upwards, and the main valve of the switch valve is completely opened;
step S5: pressure trigger type pilot operated switch valve closing stage: when the electromagnetic coil 8 is de-energized, the electromagnetic field disappears, the attraction force between the movable armature 12 and the static armature 13 disappears, the piston 9 moves downwards under the action of the spring 6, the piston 9 drives oil to be replenished to the pressure trigger cavity J from an oil tank oil way, meanwhile, the piston 9 drives the main valve spool 16 to return to the closing position of the switch valve, when a load end oil way is switched from a pressure oil source to an oil tank oil source, the pressure of a load cavity B on the left side of the pilot valve body 1 is greater than the pressure of a loading cavity F on the right side of the pilot valve bonnet 3, and the pressure trigger is pushed back to the rightmost end of the pilot valve bonnet;
step S6: the steps S1 to S5 are repeated, and the linkage structure of the pressure trigger and the electromagnet is controlled to ensure that the switching valve can be opened only after the pressure difference between the front end and the rear end of the valve port of the switching valve is reduced, so that the condition that the switching valve is opened without reducing the pressure difference of the valve port is avoided, and the larger valve port throttling loss is caused.
Example (b):
in this example, a pressure-triggered pilot-operated switching valve includes a pilot valve body 1 and a pressure trigger 2 disposed inside the pilot valve body 1, wherein a load end pressure hole a is disposed at the left end of the pilot valve body 1, a trigger oil passage G and an unloading hole H are disposed at the lower end of the pilot valve body 1, and a load end pressure hole I is disposed at the lower end of a pilot valve cover 3; the trigger oil path G is connected with the pressure trigger accommodating cavity J through an opening on the switch valve upper cover 5; the pressure trigger cavity J consists of a switch valve upper cover 5, a static armature 11 and a piston 9; an electromagnetic coil 8 is arranged around the static armature 11 and the valve body 17 of the switch valve, and the electromagnetic coil 8 surrounds the magnetic resistance sleeve 7; a spring 6 is arranged in the pressure trigger accommodating cavity J, a piston 9 is arranged below the spring 6, the piston 9 is connected with a main valve core 16 through threads, and the middle part of the main valve core 16 is connected with a movable armature 12 through threads;
the main valve core 16 is arranged in the switch valve body 17; the valve core 16 of the main valve can move up and down under the driving of the movable armature 12, so that the load end K of the valve body 17 of the switch valve is communicated with or disconnected from the load end L, and the switch valve is opened or closed; the piston 9 can move up and down under the driving of the movable armature 12, and the piston 9 can compress and release the spring 6 through the movement of the piston; the joint of the upper switch valve cover 5 and the switch valve body 17 is sealed by a switch valve sealing ring 14; the connecting part of the switch valve upper cover 5 and the switch valve body 17 is provided with a magnetic conductive ring 13 and a magnetic resistance ring 15.
In this embodiment, the pressure trigger 2 is a cylinder with an H-shaped cross section along an axis, an annular oil path C is arranged at the left end of the pressure trigger 2, the annular oil path C is communicated with a pressure signal oil path D, and the right end of the pressure signal oil path D is communicated with the loading cavity F; the left end surface of the pressure trigger 2 and the pilot valve body 1 form a load cavity B; the right end face of the pressure trigger 2 and the pilot valve cover 3 form a loading cavity F; the middle part of the pressure trigger 2 is concave cylinder and the pilot valve body 1 form a hydraulic lock cavity E.
As shown in fig. 5, a pressure hole a at the load end at the left end of the pilot valve body 1 is connected with an oil path at the load end through threads; an unloading hole H at the lower end of the pilot valve body 1 is connected with an oil way of an oil tank through threads; a pressure hole I at the loading end of the lower end of the pilot valve cover 3 is connected with an oil way at the loading end through threads; a connecting hole K of a load end at the left end of the switch valve body 17 is connected with an oil way of the load end through threads; and a connecting hole L at the loading end at the right end of the switch valve body 17 is connected with an oil way at the loading end through threads.
As shown in fig. 6 to 8, the method of operating the pressure-triggered pilot operated switch valve may be performed as follows:
(1) As shown in fig. 6, when the pressure-triggered pilot operated on-off valve is in the initial state, the solenoid 8 is not energized; the right end face of the pressure trigger 2 is tightly attached to the right end face of the inner side of the pilot valve cover 3; the pressure signal oil way D, the annular oil way C, the trigger oil way G and the pressure trigger cavity J are filled with hydraulic oil; the spring 6 is uncompressed and the main valve spool 16 is in a closed state; a loading end pressure hole I at the lower end of the pilot valve body 1 is connected with a loading end oil way (an oil tank oil source), and the oil tank oil source is a low-pressure oil source; a connecting hole L at the loading end of the right end of the switch valve body 17 is connected with an oil source (an oil source of an oil tank) at the loading end;
(2) As shown in fig. 7, the charging-end oil passage (tank oil source) is switched to the charging-end oil passage (pressure oil source), which is a high-pressure oil source; when the electromagnetic coil 8 is electrified, a magnetic field is generated, and the electromagnetic field enables the upper cover 5 of the switch valve, the magnetic conductive ring 13, the movable armature 12 and the static armature 11 to form a closed-loop magnetic circuit; under the action of an electromagnetic field, the movable armature 12 is attracted by the static armature 11 and is stressed to move upwards, the movable armature 12 drives the main valve element 16 to move upwards, the main valve element 16 drives the piston 9 to move upwards, the piston 9 compresses the spring 6, and meanwhile, hydraulic oil in the pressure trigger accommodating cavity J is transmitted to the right end face of the inner side of the pilot valve cover 3 and the right end face of the pressure trigger 2 through the trigger oil way G-the annular oil way C-the pressure signal oil way D-the loading accommodating cavity F so that the pressure trigger 2 is stressed to move leftwards, and the pressure hole I at the loading end is opened; at this time, when the pressure trigger 2 moves leftwards to the position where the annular oil path C and the trigger oil path G are cut off, and the pressure of the loading end oil path (pressure oil source) is smaller than that of the loading end oil path, the hydraulic pressure applied to the left end face of the pressure trigger 2 is greater than that applied to the right end face of the pressure trigger 2, and the pressure trigger 2 is pushed rightwards again until the pressure of the loading end oil path (pressure oil source) is greater than that of the loading end oil path, and the pressure trigger 2 continues to move leftwards;
(3) As shown in fig. 8, when the pressure trigger 2 moves to the leftmost end under the action of hydraulic pressure, the pressure trigger chamber J is connected to the hydraulic lock chamber E through the trigger oil passage G, and the hydraulic lock chamber E is connected to the oil passage of the oil tank through the unloading hole H, at this time, the pressure trigger chamber J unloads, the hydraulic lock of the main valve of the switching valve is released, the movable armature 12 drives the valve core 16 of the main valve to continue moving upward under the action of electromagnetic force, so that the load end connection hole K in the valve body 17 of the switching valve is communicated with the load end connection hole L, and the main valve of the switching valve is opened;
(4) As shown in fig. 6, when the loading end oil path (pressure oil source) is switched to the loading end oil path (oil source in the oil tank), the hydraulic pressure of the left end face of the pressure trigger 2 is greater than the hydraulic pressure of the right end face of the pressure trigger 2, the pressure trigger 2 moves rightward under the action of the hydraulic pressure, and at the same time, the electromagnetic coil 8 is de-energized, the magnetic field disappears, so that the attraction force between the movable armature 12 and the static armature 11 disappears, the piston 9 moves downward under the action of the spring 6, the piston 9 supplements the hydraulic oil from the oil path in the oil tank to the unloading hole H to the hydraulic lock chamber E to the trigger oil path G to the pressure trigger chamber J, and at the same time, the piston 9 drives the main valve core 16 of the main valve to move downward, the main valve of the switching valve is closed, and the pressure trigger 2 returns to the rightmost end of the pilot valve to wait for the next circulation;
(5) Repeating the steps (1) - (4) in this way, the switching process of the switching valve controlled by the energizing signal of the electromagnetic coil and the pressure difference between the front and the back of the valve port is completed.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (10)
1. A pressure-triggered pilot operated switch valve, characterized in that: a pressure trigger cavity of a pressure trigger is arranged in an electromagnet device of the switch valve, the pressure trigger is arranged in an oil cavity of the pilot valve and slides left and right to form a hydraulic lock cavity at the position of the pressure trigger, a load cavity B at the left side of the pressure trigger and a load cavity F at the right side of the pressure trigger, the pressure trigger cavity can be communicated with the hydraulic lock cavity when the pressure trigger slides, an electric control signal of the switch valve is linked with the switch valve through a pressure signal, and the starting condition of the pressure trigger is associated with the power-on state of the electromagnet of the switch valve; the open condition of the switching valve is associated with the equilibrium state of the left and right pressures of the pressure trigger.
2. A pressure triggered pilot operated switch valve as set forth in claim 1 wherein: the switch valve comprises a working circuit, a switch valve body (17), a switch valve upper cover (5), a pilot valve cover (3), a pilot valve body (1) and a pressure trigger (2) arranged inside the pilot valve body (1);
the working circuit comprises a load end oil circuit and a load end oil circuit, and an oil source of the load end oil circuit is periodically switched between a pressure oil source and an oil source of an oil tank according to the working requirement of the current working circuit; the pressure oil source is a high-pressure oil source of a switch valve; the oil source of the oil tank is a low-pressure oil source of a switch valve;
one end of the load end oil way is connected with a load end connecting hole (K) of the switch valve body (17), and the other end of the load end oil way is connected with a load end pressure hole (A) at the left end of the pilot valve body (1);
one end of the loading end oil way is connected with a loading end connecting hole (L) of the switch valve body (17), and the other end of the loading end oil way is connected with a loading end pressure hole (I) at the right end of the pilot valve bonnet (3);
the pilot valve body (1) is connected with an oil tank oil way through an unloading hole (H), and the pilot valve body (1) is connected with a pressure trigger containing cavity (J) in the switch valve body (17) through a trigger oil way (G).
3. A pressure trigger type pilot operated switch valve according to claim 2, wherein: a main valve core (16) is arranged at the valve body (17) part of the switch valve, a movable armature (12) of a switch valve electromagnet is arranged in the middle of the main valve core (16), and a piston (9) is arranged at the tail end of the main valve core (16); the piston (9) is arranged in a static armature (11) of the switch valve electromagnet, a spring (6) is arranged in the static armature (11), a magnetic resistance sleeve (7) is arranged around the static armature (11), and an electromagnetic coil (8) is arranged around the magnetic resistance sleeve (7); static armature (11), piston (9), spring (6), hinder magnetic sleeve (7), solenoid (8) set up in ooff valve upper cover (5), ooff valve upper cover (5) enclose into pressure jointly with static armature (11), piston (9) and trigger and hold chamber (J), pressure trigger holds the inside hydraulic oil that is full of chamber (J).
4. A pressure trigger type pilot operated switch valve according to claim 3, wherein: the pilot valve body (1) is a hollow column, and a load end pressure hole (A) is formed in the left end face of the pilot valve body; a trigger oil way (G) is arranged in the middle of the lower side of the pilot valve body (1), and an unloading hole (H) is arranged at the right end of the trigger oil way (G); the right end face of the pilot valve body (1) is a matching face of the left end face of the pilot valve cover (3), and a screw hole is formed in the matching face; the right end surface of the inner side of the pilot valve cover (3) is a cylindrical concave platform; and a loading end pressure hole (I) is arranged at the lower end of the pilot valve cover (3).
5. The pressure-triggered pilot operated switch valve according to claim 4, wherein: the pilot valve body (1) and the left end face of the pressure trigger (2) form a load containing cavity (B); a hydraulic lock containing cavity (E) is formed by the middle parts of the pilot valve body (1) and the pressure trigger (2); the pilot valve cover (3) and the right end face of the pressure trigger (2) form a loading cavity (F).
6. The pressure-triggered pilot operated switch valve according to claim 4, wherein: the pilot valve body is a hollow cylinder, the inside left end face of the hollow cylinder is a cylindrical concave table for setting a load end pressure hole, the right end face of the pilot valve body is a fitting surface of the left end face of the pilot valve cover, and screw holes are formed in the fitting surface.
7. A pressure trigger type pilot operated switch valve according to claim 5, wherein: the pressure trigger (2) is a cylinder with an H-shaped section along the axis, an annular oil way (C) is processed at the left end of the pressure trigger (2), and a pressure trigger oil way (D) is processed inside the pressure trigger (2); an opening hole connected with a pressure signal oil way (D) is formed in the annular oil way (C), and an oil way formed by the pressure signal oil way (D) and the inner opening hole of the annular oil way (C) is an L-shaped section oil way; the right end of the pressure signal oil way (D) is provided with a hole on the right end face of the pressure trigger (2); the pressure trigger (2) can move left and right in a cavity formed by the pilot valve body (1) and the pilot valve cover (3).
8. A pressure trigger type pilot operated switch valve according to claim 5, wherein: the upper end of the pressure trigger accommodating cavity (J) is provided with an opening which is communicated with a trigger oil way (G) at the lower end of the pilot valve body (1), and the trigger oil way (G) is communicated with the pressure trigger accommodating cavity (J) through the opening to form a hydraulic lock of the main valve of the switch valve.
9. A pressure triggered pilot operated switch valve according to claim 8, characterized in that: a magnet-resisting ring (15) is arranged in a groove on the upper end surface of the switch valve body (17), and the magnet-resisting ring (15) is of a concave annular structure; a magnetic conduction ring (13) is arranged on the concave annular surface of the magnetic resistance ring (15);
a closed-loop magnetic circuit is formed among the switch valve upper cover (5), the magnetic conduction ring (13), the movable armature (12) and the static armature (11).
10. A method of operating a pressure-triggered pilot operated switch valve, using the pressure-triggered pilot operated switch valve as set forth in claim 9, characterized in that: the working method comprises the following steps;
step S1: a pressure trigger type pilot-operated switch valve opening preparation stage: the pressure trigger (2) is arranged in the pilot valve body (1), the right end face of the pressure trigger (2) is tightly attached to the pilot valve cover (3), the pressure trigger (2) blocks a loading end pressure hole (I) at the lower end of the pilot valve cover (3), a left end annular oil way (C) of the pressure trigger (2) is communicated with a trigger oil way (G) at the lower end of the pilot valve body (1), and the trigger oil way (G) is communicated with a pressure trigger accommodating cavity (J) through an opening at the upper end of the pressure trigger accommodating cavity (J);
step S2: the pressure trigger type pilot-operated switch valve is opened in the first stage: when a load end oil path is switched from an oil source of an oil tank to a pressure oil source, and meanwhile, a solenoid coil (8) is subjected to high-pressure excitation, so that current in the solenoid coil (8) rises, an electromagnetic field generated by the solenoid coil (8) forms a closed-loop magnetic circuit among an upper cover (5) of a switch valve, a magnetic conductive ring (13), a movable armature (12) and a static armature (11), so that the static armature (11) attracts the movable armature (12) to move upwards and drives a main valve spool (16) to move upwards, the main valve spool (16) drives a piston (9) at the upper end of the main valve spool (16) to move upwards, hydraulic oil in a pressure trigger accommodating cavity (J) sequentially passes through a trigger oil path (G) -annular oil path (C) -pressure signal oil path (D) to a cylindrical concave table on the inner end surface of the right side of a pilot valve cover (3) and pushes a pressure trigger (2) to move leftwards;
and step S3: and a second stage of opening the pressure trigger type pilot-operated switch valve: when the pressure trigger (2) moves to a certain stroke leftwards, the connection between the annular oil circuit (C) at the left end of the pressure trigger (2) and the pressure trigger containing cavity (J) is cut off through the trigger oil circuit (G), meanwhile, the loading end pressure hole (I) at the lower end of the pilot valve cover (3) which is blocked by the pressure trigger (2) is opened to be communicated with the oil circuit at the loading end, when the oil pressure of the oil circuit at the loading end is smaller than that of the oil circuit at the loading end, the pressure trigger (2) is pushed back rightwards until the oil pressure of the oil circuit at the loading end is larger than that of the oil circuit at the loading end, and the pressure trigger (2) is further pushed leftwards;
and step S4: a third stage of opening the pressure-triggered pilot-operated switch valve: when the pressure trigger (2) moves leftwards continuously to a preset stroke, the pressure trigger cavity (J) is connected to an oil tank oil circuit sequentially through a trigger oil circuit (G), a hydraulic lock cavity (E) and an unloading hole (H), at the moment, hydraulic oil in the pressure trigger cavity (J) is unloaded, a main valve hydraulic lock of the switch valve is released, the movable armature (12) is further attracted by the static armature (12) to move upwards under the action of a magnetic field of the electromagnetic coil (8), and a valve core (16) of the main valve is driven to move upwards, so that the main valve of the switch valve is completely opened;
step S5: pressure trigger type pilot operated switch valve closing stage: when the electromagnetic coil (8) is de-energized, an electromagnetic field disappears, attraction force between the movable armature (12) and the static armature (13) disappears, the piston (9) moves downwards under the action of the spring (6), the piston (9) drives oil to make the oil be replenished to the pressure trigger containing cavity (J) from an oil tank oil way, meanwhile, the piston (9) drives the main valve spool (16) to return to a closing position of the switch valve, when a load end oil way is switched from a pressure oil source to an oil tank oil source, the pressure of a load containing cavity (B) on the left side of the pilot valve body (1) is larger than the pressure of a load containing cavity (F) on the right side of the pilot valve cover (3), and the pressure trigger is pushed back to the rightmost end of the pilot valve cover;
step S6: the steps S1 to S5 are repeated, and the linkage structure of the pressure trigger and the electromagnet is controlled to ensure that the switching valve can be opened only after the pressure difference between the front end and the rear end of the valve port of the switching valve is reduced, so that the condition that the switching valve is opened without reducing the pressure difference of the valve port is avoided, and the larger valve port throttling loss is caused.
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| CN202210808954.XA CN115388056A (en) | 2022-07-11 | 2022-07-11 | Pressure trigger type pilot-operated switch valve |
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| CN202210808954.XA CN115388056A (en) | 2022-07-11 | 2022-07-11 | Pressure trigger type pilot-operated switch valve |
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