CN112081938A - Piezoelectric driving large-flow fuel valve - Google Patents

Piezoelectric driving large-flow fuel valve Download PDF

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Publication number
CN112081938A
CN112081938A CN202010672844.6A CN202010672844A CN112081938A CN 112081938 A CN112081938 A CN 112081938A CN 202010672844 A CN202010672844 A CN 202010672844A CN 112081938 A CN112081938 A CN 112081938A
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Prior art keywords
valve
valve core
static
oil
disc
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CN202010672844.6A
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CN112081938B (en
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王彬
朱有坤
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
    • F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
    • F16K3/26—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members with fluid passages in the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/32—Means for additional adjustment of the rate of flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F16K31/007—Piezoelectric stacks
    • F16K31/008—Piezoelectric stacks for sliding valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The invention discloses a piezoelectric driving high-flow fuel valve which comprises a valve body, first to third end covers, first to second valve sleeves, first to second static valve discs, first to second fixed rods, a first valve core, a second valve core, a piezoelectric stack and a force transmission assembly. The invention replaces the mode of changing the relative displacement between the slide valve and the valve sleeve by utilizing the stepped annular multi-dimensional throttling channel between the regulating valve core and the static valve disc, greatly improves the flow area, and can improve the output flow of the fuel valve by times under the same opening; the baffle driving mode of the traditional torque motor is replaced by directly driving the valve core by the cylindrical multilayer stacked piezoelectric stack, so that the defects of complex torque motor structure, high installation requirement, poor reliability and the like are avoided; the displacement of the valve core is increased by amplifying the output displacement of the piezoelectric stack, so that the larger flow adjusting range is realized. Meanwhile, the piezoelectric stack is slightly influenced by severe environments such as high temperature and the like, and the adaptability of the fuel valve can be enhanced.

Description

Piezoelectric driving large-flow fuel valve
Technical Field
The invention relates to an oil supply flow control element of an aircraft fuel system, in particular to a piezoelectric drive large-flow fuel valve.
Background
The fuel flow control valve used in the present airplane is mainly a nozzle baffle type electro-hydraulic servo valve and a high-speed switch electromagnetic valve. The electro-hydraulic servo valve has the advantages of complex structure, poor pollution resistance and long-term use as a key control component with extremely high failure rate. The torque motor of the electro-mechanical converter is difficult to improve the driving capability due to the limitation of volume and weight, so that the large-flow and high-pressure fuel output cannot be realized. The high-speed switching electromagnetic valve has the defects of lag, low response speed, dead zone, saturation zone, poor linearity and the like, so that the control precision is poor. The piezoelectric stack is a novel electro-mechanical conversion structure and has the advantages of compact structure, fast response, strong anti-interference capability and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a piezoelectric driving large-flow fuel valve aiming at the defects related in the background technology, wherein a double-valve core and a displacement amplification structure are arranged, the oil passing surface is arranged to be the area of a concentric multi-stage valve port respectively matched with a valve core and a static valve disc, the output flow is greatly improved, and the piezoelectric stack is used for driving, so that the structure of the fuel valve is simplified, and the reliability and the response speed of the fuel valve are improved.
The invention adopts the following technical scheme for solving the technical problems:
a piezoelectric drive high-flow fuel valve comprises a valve body, first to third end covers, first to second valve sleeves, first to second static valve discs, first to second fixed rods, a first valve core, a second valve core, a piezoelectric stack and a force transmission assembly;
the valve body is a T-shaped hollow pipe, the three ends of the valve body are open, and the valve body comprises a transverse pipe and a vertical pipe vertically and fixedly connected with the center of the transverse pipe;
the first end cover and the third end cover are fixedly connected with two ends of the transverse pipe respectively, and the second end cover is fixedly connected with one end of the vertical pipe far away from the transverse pipe;
the center of the inner wall of the transverse pipe is provided with a raised positioning ring, the positioning ring is a gap ring, and the gap of the positioning ring is positioned at the communication position of the transverse pipe and the vertical pipe;
the first valve sleeve and the second valve sleeve are of the same structure and are hollow cylinders with one open end and the other closed end, and the centers of the closed end surfaces are provided with through holes; the first valve sleeve and the second valve sleeve are symmetrically arranged in the transverse pipe, the outer wall of the first valve sleeve is attached to the inner wall of the transverse pipe, one end of the first valve sleeve abuts against the first end cover, the other end of the first valve sleeve abuts against one side of the positioning ring, one end of the second valve sleeve abuts against the third end cover, the other end of the second valve sleeve abuts against the other side of the positioning ring, and the open ends of the first valve sleeve and the second valve sleeve are opposite; the wall thicknesses of the first valve sleeve and the second valve sleeve are more than or equal to the wall thickness of the positioning ring;
the first static valve disc and the second static valve disc are of the same structure and are both cylinders, M annular grooves which correspond to each other one by one are uniformly arranged on two end faces along the radial direction, a plurality of through grooves used for communicating with each other are uniformly arranged between the corresponding annular grooves in the circumferential direction, and M is a natural number which is more than or equal to 1;
the first static valve disc and the second static valve disc are symmetrically arranged in the first valve sleeve and the second valve sleeve, and the outer walls of the first static valve disc and the second static valve disc are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve; one end of the first fixed rod is vertically and fixedly connected with the center of the end face of the first static valve disc close to the closed end of the first valve sleeve, and the other end of the first fixed rod is hermetically and fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve; one end of the second fixed rod is vertically and fixedly connected with the center of the end face of the second static valve disc close to the closed end of the second valve sleeve, and the other end of the second fixed rod is fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve in a sealing manner;
the first valve core and the second valve core have the same structure and respectively comprise an oil inlet part and an oil outlet part, wherein the oil inlet part is a cylinder, M annular grooves which correspond to one another one by one are uniformly arranged on two end faces along the radial direction, and a plurality of through grooves which are used for being communicated with one another are uniformly arranged between the corresponding annular grooves in the circumferential direction; the oil outlet part is a hollow cylinder with an opening at one end and a closed end, and a plurality of through holes for oil to flow out are uniformly arranged on the side wall of the oil outlet part in the circumferential direction; the opening end of the oil outlet part is coaxially and fixedly connected with one end of the oil inlet part, and the outer diameter of the oil outlet part is equal to that of the oil inlet part;
the first valve core and the second valve core are symmetrically arranged in the first valve sleeve and the second valve sleeve, the outer walls of the first valve core and the second valve sleeve are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve, the open end of the oil outlet part of the first valve core is opposite to the open end of the oil outlet part of the second valve core, and the first valve core and the second valve core are positioned between the first static valve disc and the second static valve disc;
when the first valve core oil inlet part is attached to the first static valve disc, the annular groove in the first valve core oil inlet part and the annular groove in the first static valve disc are not communicated in a staggered mode; when the second valve core oil inlet part is attached to the second static valve disc, the annular groove in the second valve core oil inlet part and the annular groove in the second static valve disc are staggered and not communicated with each other;
the inner wall of the transverse pipe is provided with a first annular groove and a second annular groove respectively corresponding to the through hole on the oil outlet part of the first valve core and the through hole on the oil outlet part of the second valve core; a plurality of through holes for communicating the oil outlet part of the first valve core with the through grooves of the first annular groove are uniformly formed in the side wall of the first valve sleeve in the circumferential direction; a plurality of through holes for communicating the oil outlet part of the second valve core with the through grooves of the second annular groove are uniformly formed in the side wall of the second valve sleeve in the circumferential direction;
the side wall of the first valve sleeve between the closed end of the first valve sleeve and the first static valve disc is provided with a first oil conveying hole for oil conveying, and the side wall of the second valve sleeve between the closed end of the second valve sleeve and the second static valve disc is provided with a second oil conveying hole for oil conveying;
the transverse pipe is provided with an oil inlet on the outer wall thereof, and a first pipeline communicated with the oil inlet, a first oil conveying hole and a second oil conveying hole is arranged in the side wall of the transverse pipe;
the outer wall of the transverse pipe is provided with an oil outlet, and a second pipeline communicated with the oil inlet, the first annular groove and the second annular groove is arranged in the side wall of the transverse pipe;
the piezoelectric stack is arranged in the vertical tube, one end of the piezoelectric stack is fixedly connected with the second end cover, and the other end of the piezoelectric stack is fixedly connected with one end of the dowel bar;
the force transmission assembly comprises a force transmission rod, a first roller, a second roller, a spring and a first transmission block, a second transmission block and a third transmission block;
the first and second conducting blocks have the same structure and are both columnar and symmetrically arranged between the first valve core and the second valve core, wherein one end of the first conducting block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the first valve core, and the other end of the first conducting block is connected with one end of the spring; one end of the second conduction block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the second valve core, and the other end of the second conduction block is connected with the other end of the first spring;
the spring is used for providing pre-pressure, so that the oil inlet part of the first valve core is attached to the first static valve disc, and the oil inlet part of the second valve core is attached to the second static valve disc;
the first conducting block and the second conducting block are respectively cut off to form an inclined plane between the spring and the second end cover, the distance between the inclined plane of the first conducting block and the inclined plane of the second conducting block is gradually reduced when the first conducting block and the second conducting block are far away from the second end cover, and the intersection line of the plane where the inclined plane of the first conducting block is located and the plane where the inclined plane of the second conducting block is located is perpendicular to the axis of the transverse pipe and the axis of the vertical pipe;
the rotating shafts of the first roller and the second roller are fixed at one ends, far away from the piezoelectric stack, of the dowel bars and can rotate freely, the first roller is pressed on the inclined surface of the first conducting block, and the second roller is pressed on the inclined surface of the second conducting block;
the piezoelectric stack is used for driving the first roller to press the inclined plane of the first transmission block and the second roller to press the inclined plane of the second transmission block, overcomes the pretension force of the spring, and further adjusts a gap between the oil inlet part of the first valve core and the first static valve disc and a gap between the oil inlet part of the second valve core and the second static valve disc.
As a further optimization scheme of the piezoelectric driving high-flow fuel valve, four arc-shaped through grooves are uniformly arranged between corresponding annular grooves on two end faces of the first static valve disc and the second static valve disc in the circumferential direction to form a cross-shaped fixing rib.
The invention also discloses a flow excitation method of the piezoelectric drive high-flow fuel valve, which comprises the following steps:
step 1), before the piezoelectric stack is powered off, cutting off an oil source; after the piezoelectric stack supplies power, the control voltage of the piezoelectric stack is adjusted to a zero position, the force transmission assembly is located at an initial position, the first roller wheel is separated from the first conducting block, the second roller wheel is separated from the second conducting block, and the first valve core and the second valve core are respectively attached to the first static valve disc and the second static valve disc under the action of the spring;
step 2), adjusting the control voltage of the piezoelectric stack to a preset maximum voltage value, wherein the piezoelectric stack deforms to push the force transmission assembly to move until the first roller wheel is tightly contacted with the first conducting block and the second roller wheel is tightly contacted with the second conducting block, and the output deformation force of the piezoelectric stack is respectively transmitted to the first valve core and the second valve core through the first roller wheel and the second roller wheel, so that the first valve core and the first static valve disc are kept in a tight contact state, and the second valve core and the second static valve disc are kept in a tight contact state; then, an oil source is connected, oil with certain pressure enters a first oil transmission hole and a second oil transmission hole from an oil inlet, and then enters a cavity between a first valve sleeve and a first static valve disc and a cavity between a second valve sleeve and a second static valve disc respectively, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and a fuel valve is in a closed state;
step 3), adjusting the control voltage of the piezoelectric stack to a preset voltage value, wherein the preset voltage value is smaller than a preset maximum voltage value, so that the deformation of the piezoelectric stack is reduced, the force transmission assembly moves away from the conduction block, then the first roller and the first conduction block, and the second roller and the second conduction block are separated, the first valve core moves towards the direction of the second valve core under the action of oil in the first static valve disc, the second valve core moves towards the direction of the first valve core under the action of the oil in the second static valve disc until the first roller and the first conduction block, and the second roller and the second conduction block are in tight contact, and the first valve core and the second valve core stop moving; at the moment, the acting force of the piezoelectric stack on the first valve core and the acting force of the oil liquid on the first valve core and the second valve core are equal in magnitude and opposite in direction; gaps are reserved between the first valve sleeve and the first static valve disc and between the second valve sleeve and the second static valve disc, oil respectively flows into the oil outlet part of the first valve core and the oil outlet part of the second valve core, then flows into the first annular groove and the second annular groove from through holes in the side walls of the oil outlet part of the first valve core and the oil outlet part of the second valve core through grooves in the first valve sleeve and through grooves in the second valve sleeve respectively, and finally is gathered at an oil outlet, and at the moment, the fuel valve is in an open state;
when the control voltage of the piezoelectric stack is adjusted to a zero position, the piezoelectric stack does not have displacement output, the force transmission assembly returns to an initial position along with the displacement output end of the piezoelectric stack, the first valve core and the second valve core move towards the center direction of the transverse pipe under the acting force of oil, the first valve core and the second valve core are separated from the first static valve disc and the second static valve disc respectively to the maximum distance, and the fuel valve reaches the maximum output state;
and 4) adjusting the control voltage of the piezoelectric stack to the maximum value, wherein the deformation of the piezoelectric stack reaches the maximum value, the deformation force is transmitted to the first valve core and the second valve core through the force transmission assembly, so that the first valve core is attached to the first static valve disc, the second valve core is attached to the second static valve disc, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and the fuel valve is closed.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the valve core is directly driven by the piezoelectric stack to replace the original prestage, and the defects of complex structure, high installation requirement, poor reliability and the like of the traditional torque motor are eliminated. Meanwhile, the piezoelectric stack is driven to be slightly influenced by severe environments such as high temperature and the like, the adaptability of the fuel valve can be enhanced, and the response speed is higher;
2. the baffle structure is cancelled, so that the high-frequency flutter and squeal of the thin and long metal plate are avoided, and the system stability is improved;
3. the oil-through surface is set to be the area of a valve port of a concentric multi-stage valve formed by matching the valve core and the static valve disc, the flow area is increased by times under the same opening degree, and the output flow capacity of the whole valve is improved.
Drawings
FIG. 1 is a structural cross-sectional view of the present invention;
FIG. 2 is a schematic view of the first stationary valve disk ring groove structure of the present invention
FIG. 3 is a schematic view of a first valve core according to the present invention;
fig. 4 is a schematic view of the construction of the first valve sleeve of the present invention;
FIG. 5 is a schematic view of a communication structure between an oil inlet and an oil outlet in the present invention;
FIG. 6 is a schematic view of the force transfer assembly of the present invention;
FIG. 7 is a schematic diagram illustrating the principle of displacement amplification in the present invention.
In the figure, 1-a first end cover, 2-a first valve sleeve, 3-a dowel bar, 4-a piezoelectric stack, 5-a second end cover, 6-a second valve sleeve, 7-a third end cover, 8-a second static valve disc, 9-a second valve core, 10-a second conduction block, 11-a spring, 12-an oil outlet, 13-a first conduction block, 14-a first valve core, 15-a first static valve disc, 16-a valve body, 17-an oil inlet, 18-a cross fixing rib, 19-a first roller and 20-a second roller.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
As shown in FIG. 1, the invention discloses a piezoelectric drive high-flow fuel valve, which comprises a valve body, first to third end covers, first to second valve sleeves, first to second static valve discs, first to second fixed rods, a first valve core, a second valve core, a piezoelectric stack and a force transmission assembly.
The valve body is a T-shaped hollow pipe, the three ends of the valve body are open, and the valve body comprises a transverse pipe and a vertical pipe vertically and fixedly connected with the center of the transverse pipe;
the first end cover and the third end cover are fixedly connected with two ends of the transverse pipe respectively, and the second end cover is fixedly connected with one end of the vertical pipe far away from the transverse pipe;
the inner wall of the transverse pipe is provided with a raised positioning ring at the center, the positioning ring is a gap ring, and the gap of the positioning ring is positioned at the communication position of the transverse pipe and the vertical pipe.
The first valve sleeve and the second valve sleeve are of the same structure and are hollow cylinders with one open end and the other closed end, and the centers of the closed end surfaces are provided with through holes; the first valve sleeve and the second valve sleeve are symmetrically arranged in the transverse pipe, the outer wall of the first valve sleeve is attached to the inner wall of the transverse pipe, one end of the first valve sleeve abuts against the first end cover, the other end of the first valve sleeve abuts against one side of the positioning ring, one end of the second valve sleeve abuts against the third end cover, the other end of the second valve sleeve abuts against the other side of the positioning ring, and the open ends of the first valve sleeve and the second valve sleeve are opposite; the wall thicknesses of the first valve sleeve and the second valve sleeve are larger than or equal to that of the positioning ring.
As shown in fig. 2, the first static valve disc and the second static valve disc have the same structure and are both cylinders, M annular grooves corresponding to each other one by one are uniformly formed in the two end faces along the radial direction, a plurality of through grooves for communicating with each other are uniformly formed in the circumferential direction between the corresponding annular grooves, and M is a natural number greater than or equal to 1;
the first static valve disc and the second static valve disc are symmetrically arranged in the first valve sleeve and the second valve sleeve, and the outer walls of the first static valve disc and the second static valve disc are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve; one end of the first fixed rod is vertically and fixedly connected with the center of the end face of the first static valve disc close to the closed end of the first valve sleeve, and the other end of the first fixed rod is hermetically and fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve; one end of the second fixed rod is vertically and fixedly connected with the center of the end face of the second static valve disc close to the closed end of the second valve sleeve, and the other end of the second fixed rod is fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve in a sealing mode.
As shown in fig. 3, the first valve core and the second valve core have the same structure and both include an oil inlet portion and an oil outlet portion, wherein the oil inlet portion is a cylinder, M annular grooves corresponding to one another are uniformly formed in the two end faces in the radial direction, and a plurality of through grooves for communicating with one another are uniformly formed in the circumferential direction between the corresponding annular grooves; the oil outlet part is a hollow cylinder with an opening at one end and a closed end, and a plurality of through holes for oil to flow out are uniformly arranged on the side wall of the oil outlet part in the circumferential direction; the opening end of the oil outlet part is coaxially and fixedly connected with one end of the oil inlet part, and the outer diameter of the oil outlet part is equal to that of the oil inlet part;
the first valve core and the second valve core are symmetrically arranged in the first valve sleeve and the second valve sleeve, the outer walls of the first valve core and the second valve sleeve are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve, the open end of the oil outlet part of the first valve core is opposite to the open end of the oil outlet part of the second valve core, and the first valve core and the second valve core are positioned between the first static valve disc and the second static valve disc;
when the first valve core oil inlet part is attached to the first static valve disc, the annular groove in the first valve core oil inlet part and the annular groove in the first static valve disc are not communicated in a staggered mode; when the second valve core oil inlet portion is attached to the second static valve disc, the annular groove in the second valve core oil inlet portion and the annular groove in the second static valve disc are not communicated in a staggered mode.
The inner wall of the transverse pipe is provided with a first annular groove and a second annular groove respectively corresponding to the through hole on the oil outlet part of the first valve core and the through hole on the oil outlet part of the second valve core; a plurality of through holes for communicating the oil outlet part of the first valve core with the through grooves of the first annular groove are uniformly formed in the side wall of the first valve sleeve in the circumferential direction; a plurality of through holes for communicating the oil outlet part of the second valve core with the through grooves of the second annular groove are uniformly formed in the side wall of the second valve sleeve in the circumferential direction; as shown in fig. 4.
As shown in fig. 5, the first valve sleeve is provided with a first oil delivery hole for delivering oil on the side wall between the closed end of the first valve sleeve and the first static valve disc, and the second valve sleeve is provided with a second oil delivery hole for delivering oil on the side wall between the closed end of the second valve sleeve and the second static valve disc;
the transverse pipe is provided with an oil inlet on the outer wall thereof, and a first pipeline communicated with the oil inlet, a first oil conveying hole and a second oil conveying hole is arranged in the side wall of the transverse pipe;
the outer wall of the transverse pipe is provided with an oil outlet, and a second pipeline communicated with the oil inlet, the first annular groove and the second annular groove is arranged in the side wall of the transverse pipe.
As shown in fig. 6, the piezoelectric stack is disposed in the vertical tube, one end of the piezoelectric stack is fixedly connected to the second end cap, and the other end of the piezoelectric stack is fixedly connected to one end of the dowel bar;
the force transmission assembly comprises a force transmission rod, a first roller, a second roller, a spring and a first transmission block, a second transmission block and a third transmission block;
the first and second conducting blocks have the same structure and are both columnar and symmetrically arranged between the first valve core and the second valve core, wherein one end of the first conducting block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the first valve core, and the other end of the first conducting block is connected with one end of the spring; one end of the second conduction block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the second valve core, and the other end of the second conduction block is connected with the other end of the first spring;
the spring is used for providing pre-pressure, so that the oil inlet part of the first valve core is attached to the first static valve disc, and the oil inlet part of the second valve core is attached to the second static valve disc;
the first conducting block and the second conducting block are respectively cut off to form an inclined plane between the spring and the second end cover, the distance between the inclined plane of the first conducting block and the inclined plane of the second conducting block is gradually reduced when the first conducting block and the second conducting block are far away from the second end cover, and the intersection line of the plane where the inclined plane of the first conducting block is located and the plane where the inclined plane of the second conducting block is located is perpendicular to the axis of the transverse pipe and the axis of the vertical pipe;
the rotating shafts of the first roller and the second roller are fixed at one ends, far away from the piezoelectric stack, of the dowel bars and can rotate freely, the first roller is pressed on the inclined surface of the first conducting block, and the second roller is pressed on the inclined surface of the second conducting block;
the piezoelectric stack is used for driving the first roller to press the inclined plane of the first transmission block and the second roller to press the inclined plane of the second transmission block, overcomes the pretension force of the spring, and further adjusts a gap between the oil inlet part of the first valve core and the first static valve disc and a gap between the oil inlet part of the second valve core and the second static valve disc.
And four arc-shaped through grooves are preferably and uniformly arranged in the circumferential direction between the corresponding annular grooves on the two end surfaces of the first static valve disc and the second static valve disc to form a cross-shaped fixing rib.
The principle of displacement amplification of the present invention is shown in FIG. 7, if the piezoelectric stack outputs a displacement xsTo make the two valve cores respectively move xvTheoretically, the displacement ratio of each valve core to the driver is k = tan beta, and when the beta is smaller than 45 degrees, the amplification of the output displacement of the single-valve-core piezoelectric stack can be realized;
the invention also discloses a flow excitation method of the piezoelectric drive high-flow fuel valve, which comprises the following steps:
step 1), before the piezoelectric stack is powered off, cutting off an oil source; after the piezoelectric stack supplies power, the control voltage of the piezoelectric stack is adjusted to a zero position, the force transmission assembly is located at an initial position, the first roller wheel is separated from the first conducting block, the second roller wheel is separated from the second conducting block, and the first valve core and the second valve core are respectively attached to the first static valve disc and the second static valve disc under the action of the spring;
step 2), adjusting the control voltage of the piezoelectric stack to a preset maximum voltage value, wherein the piezoelectric stack deforms to push the force transmission assembly to move until the first roller wheel is tightly contacted with the first conducting block and the second roller wheel is tightly contacted with the second conducting block, and the output deformation force of the piezoelectric stack is respectively transmitted to the first valve core and the second valve core through the first roller wheel and the second roller wheel, so that the first valve core and the first static valve disc are kept in a tight contact state, and the second valve core and the second static valve disc are kept in a tight contact state; then, an oil source is connected, oil with certain pressure enters a first oil transmission hole and a second oil transmission hole from an oil inlet, and then enters a cavity between a first valve sleeve and a first static valve disc and a cavity between a second valve sleeve and a second static valve disc respectively, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and a fuel valve is in a closed state;
step 3), adjusting the control voltage of the piezoelectric stack to a preset voltage value, wherein the preset voltage value is smaller than a preset maximum voltage value, so that the deformation of the piezoelectric stack is reduced, the force transmission assembly moves away from the conduction block, then the first roller and the first conduction block, and the second roller and the second conduction block are separated, the first valve core moves towards the direction of the second valve core under the action of oil in the first static valve disc, the second valve core moves towards the direction of the first valve core under the action of the oil in the second static valve disc until the first roller and the first conduction block, and the second roller and the second conduction block are in tight contact, and the first valve core and the second valve core stop moving; at the moment, the acting force of the piezoelectric stack on the first valve core and the acting force of the oil liquid on the first valve core and the second valve core are equal in magnitude and opposite in direction; gaps are reserved between the first valve sleeve and the first static valve disc and between the second valve sleeve and the second static valve disc, oil respectively flows into the oil outlet part of the first valve core and the oil outlet part of the second valve core, then flows into the first annular groove and the second annular groove from through holes in the side walls of the oil outlet part of the first valve core and the oil outlet part of the second valve core through grooves in the first valve sleeve and through grooves in the second valve sleeve respectively, and finally is gathered at an oil outlet, and at the moment, the fuel valve is in an open state;
when the control voltage of the piezoelectric stack is adjusted to a zero position, the piezoelectric stack does not have displacement output, the force transmission assembly returns to an initial position along with the displacement output end of the piezoelectric stack, the first valve core and the second valve core move towards the center direction of the transverse pipe under the acting force of oil, the first valve core and the second valve core are separated from the first static valve disc and the second static valve disc respectively to the maximum distance, and the fuel valve reaches the maximum output state;
and 4) adjusting the control voltage of the piezoelectric stack to the maximum value, wherein the deformation of the piezoelectric stack reaches the maximum value, the deformation force is transmitted to the first valve core and the second valve core through the force transmission assembly, so that the first valve core is attached to the first static valve disc, the second valve core is attached to the second static valve disc, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and the fuel valve is closed.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (3)

1. A piezoelectric drive high-flow fuel valve is characterized by comprising a valve body, first to third end covers, first to second valve sleeves, first to second static valve discs, first to second fixed rods, a first valve core, a second valve core, a piezoelectric stack and a force transmission assembly;
the valve body is a T-shaped hollow pipe, the three ends of the valve body are open, and the valve body comprises a transverse pipe and a vertical pipe vertically and fixedly connected with the center of the transverse pipe;
the first end cover and the third end cover are fixedly connected with two ends of the transverse pipe respectively, and the second end cover is fixedly connected with one end of the vertical pipe far away from the transverse pipe;
the center of the inner wall of the transverse pipe is provided with a raised positioning ring, the positioning ring is a gap ring, and the gap of the positioning ring is positioned at the communication position of the transverse pipe and the vertical pipe;
the first valve sleeve and the second valve sleeve are of the same structure and are hollow cylinders with one open end and the other closed end, and the centers of the closed end surfaces are provided with through holes; the first valve sleeve and the second valve sleeve are symmetrically arranged in the transverse pipe, the outer wall of the first valve sleeve is attached to the inner wall of the transverse pipe, one end of the first valve sleeve abuts against the first end cover, the other end of the first valve sleeve abuts against one side of the positioning ring, one end of the second valve sleeve abuts against the third end cover, the other end of the second valve sleeve abuts against the other side of the positioning ring, and the open ends of the first valve sleeve and the second valve sleeve are opposite; the wall thicknesses of the first valve sleeve and the second valve sleeve are more than or equal to the wall thickness of the positioning ring;
the first static valve disc and the second static valve disc are of the same structure and are both cylinders, M annular grooves which correspond to each other one by one are uniformly arranged on two end faces along the radial direction, a plurality of through grooves used for communicating with each other are uniformly arranged between the corresponding annular grooves in the circumferential direction, and M is a natural number which is more than or equal to 1;
the first static valve disc and the second static valve disc are symmetrically arranged in the first valve sleeve and the second valve sleeve, and the outer walls of the first static valve disc and the second static valve disc are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve; one end of the first fixed rod is vertically and fixedly connected with the center of the end face of the first static valve disc close to the closed end of the first valve sleeve, and the other end of the first fixed rod is hermetically and fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve; one end of the second fixed rod is vertically and fixedly connected with the center of the end face of the second static valve disc close to the closed end of the second valve sleeve, and the other end of the second fixed rod is fixedly connected with the through hole in the center of the end face of the closed end of the first valve sleeve in a sealing manner;
the first valve core and the second valve core have the same structure and respectively comprise an oil inlet part and an oil outlet part, wherein the oil inlet part is a cylinder, M annular grooves which correspond to one another one by one are uniformly arranged on two end faces along the radial direction, and a plurality of through grooves which are used for being communicated with one another are uniformly arranged between the corresponding annular grooves in the circumferential direction; the oil outlet part is a hollow cylinder with an opening at one end and a closed end, and a plurality of through holes for oil to flow out are uniformly arranged on the side wall of the oil outlet part in the circumferential direction; the opening end of the oil outlet part is coaxially and fixedly connected with one end of the oil inlet part, and the outer diameter of the oil outlet part is equal to that of the oil inlet part;
the first valve core and the second valve core are symmetrically arranged in the first valve sleeve and the second valve sleeve, the outer walls of the first valve core and the second valve sleeve are respectively attached to the inner walls of the first valve sleeve and the second valve sleeve, the open end of the oil outlet part of the first valve core is opposite to the open end of the oil outlet part of the second valve core, and the first valve core and the second valve core are positioned between the first static valve disc and the second static valve disc;
when the first valve core oil inlet part is attached to the first static valve disc, the annular groove in the first valve core oil inlet part and the annular groove in the first static valve disc are not communicated in a staggered mode; when the second valve core oil inlet part is attached to the second static valve disc, the annular groove in the second valve core oil inlet part and the annular groove in the second static valve disc are staggered and not communicated with each other;
the inner wall of the transverse pipe is provided with a first annular groove and a second annular groove respectively corresponding to the through hole on the oil outlet part of the first valve core and the through hole on the oil outlet part of the second valve core; a plurality of through holes for communicating the oil outlet part of the first valve core with the through grooves of the first annular groove are uniformly formed in the side wall of the first valve sleeve in the circumferential direction; a plurality of through holes for communicating the oil outlet part of the second valve core with the through grooves of the second annular groove are uniformly formed in the side wall of the second valve sleeve in the circumferential direction;
the side wall of the first valve sleeve between the closed end of the first valve sleeve and the first static valve disc is provided with a first oil conveying hole for oil conveying, and the side wall of the second valve sleeve between the closed end of the second valve sleeve and the second static valve disc is provided with a second oil conveying hole for oil conveying;
the transverse pipe is provided with an oil inlet on the outer wall thereof, and a first pipeline communicated with the oil inlet, a first oil conveying hole and a second oil conveying hole is arranged in the side wall of the transverse pipe;
the outer wall of the transverse pipe is provided with an oil outlet, and a second pipeline communicated with the oil inlet, the first annular groove and the second annular groove is arranged in the side wall of the transverse pipe;
the piezoelectric stack is arranged in the vertical tube, one end of the piezoelectric stack is fixedly connected with the second end cover, and the other end of the piezoelectric stack is fixedly connected with one end of the dowel bar;
the force transmission assembly comprises a force transmission rod, a first roller, a second roller, a spring and a first transmission block, a second transmission block and a third transmission block;
the first and second conducting blocks have the same structure and are both columnar and symmetrically arranged between the first valve core and the second valve core, wherein one end of the first conducting block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the first valve core, and the other end of the first conducting block is connected with one end of the spring; one end of the second conduction block is vertically and fixedly connected with the center of the end face of the closed end of the oil outlet part of the second valve core, and the other end of the second conduction block is connected with the other end of the first spring;
the spring is used for providing pre-pressure, so that the oil inlet part of the first valve core is attached to the first static valve disc and the oil inlet part of the second valve core is attached to the second static valve disc in the non-oil-communication state;
the first conducting block and the second conducting block are respectively cut off to form an inclined plane between the spring and the second end cover, the distance between the inclined plane of the first conducting block and the inclined plane of the second conducting block is gradually reduced when the first conducting block and the second conducting block are far away from the second end cover, and the intersection line of the plane where the inclined plane of the first conducting block is located and the plane where the inclined plane of the second conducting block is located is perpendicular to the axis of the transverse pipe and the axis of the vertical pipe;
the rotating shafts of the first roller and the second roller are fixed at one ends, far away from the piezoelectric stack, of the dowel bars and can rotate freely, the first roller is pressed on the inclined surface of the first conducting block, and the second roller is pressed on the inclined surface of the second conducting block;
the piezoelectric stack is used for driving the first roller to press the inclined plane of the first transmission block and the second roller to press the inclined plane of the second transmission block, overcomes the pretension force of the spring, and further adjusts a gap between the oil inlet part of the first valve core and the first static valve disc and a gap between the oil inlet part of the second valve core and the second static valve disc.
2. The piezoelectric driving high-flow fuel valve according to claim 1, wherein four arc-shaped through grooves are uniformly arranged between corresponding annular grooves on two end faces of the first static valve disc and the second static valve disc in the circumferential direction to form a cross-shaped fixing rib.
3. The flow excitation method of the piezoelectric driven high-flow fuel valve according to claim 1, characterized by comprising the following steps:
step 1), before the piezoelectric stack is powered off, cutting off an oil source; after the piezoelectric stack supplies power, the control voltage of the piezoelectric stack is adjusted to a zero position, the force transmission assembly is located at an initial position, the first roller wheel is separated from the first conducting block, the second roller wheel is separated from the second conducting block, and the first valve core and the second valve core are respectively attached to the first static valve disc and the second static valve disc under the action of the spring;
step 2), adjusting the control voltage of the piezoelectric stack to a preset maximum voltage value, wherein the piezoelectric stack deforms to push the force transmission assembly to move until the first roller wheel is tightly contacted with the first conducting block and the second roller wheel is tightly contacted with the second conducting block, and the output deformation force of the piezoelectric stack is respectively transmitted to the first valve core and the second valve core through the first roller wheel and the second roller wheel, so that the first valve core and the first static valve disc are kept in a tight contact state, and the second valve core and the second static valve disc are kept in a tight contact state; then, an oil source is connected, oil with certain pressure enters a first oil transmission hole and a second oil transmission hole from an oil inlet, and then enters a cavity between a first valve sleeve and a first static valve disc and a cavity between a second valve sleeve and a second static valve disc respectively, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and a fuel valve is in a closed state;
step 3), adjusting the control voltage of the piezoelectric stack to a preset voltage value, wherein the preset voltage value is smaller than a preset maximum voltage value, so that the deformation of the piezoelectric stack is reduced, the force transmission assembly moves away from the conduction block, then the first roller and the first conduction block, and the second roller and the second conduction block are separated, the first valve core moves towards the direction of the second valve core under the action of oil in the first static valve disc, the second valve core moves towards the direction of the first valve core under the action of the oil in the second static valve disc until the first roller and the first conduction block, and the second roller and the second conduction block are in tight contact, and the first valve core and the second valve core stop moving; at the moment, the acting force of the piezoelectric stack on the first valve core and the acting force of the oil liquid on the first valve core and the second valve core are equal in magnitude and opposite in direction; gaps are reserved between the first valve sleeve and the first static valve disc and between the second valve sleeve and the second static valve disc, oil respectively flows into the oil outlet part of the first valve core and the oil outlet part of the second valve core, then flows into the first annular groove and the second annular groove from through holes in the side walls of the oil outlet part of the first valve core and the oil outlet part of the second valve core through grooves in the first valve sleeve and through grooves in the second valve sleeve respectively, and finally is gathered at an oil outlet, and at the moment, the fuel valve is in an open state;
when the control voltage of the piezoelectric stack is adjusted to a zero position, the piezoelectric stack does not have displacement output, the force transmission assembly returns to an initial position along with the displacement output end of the piezoelectric stack, the first valve core and the second valve core move towards the center direction of the transverse pipe under the acting force of oil, the first valve core and the second valve core are separated from the first static valve disc and the second static valve disc respectively to the maximum distance, and the fuel valve reaches the maximum output state;
and 4) adjusting the control voltage of the piezoelectric stack to the maximum value, wherein the deformation of the piezoelectric stack reaches the maximum value, the deformation force is transmitted to the first valve core and the second valve core through the force transmission assembly, so that the first valve core is attached to the first static valve disc, the second valve core is attached to the second static valve disc, at the moment, the annular grooves on the first valve core and the first static valve disc are not communicated in a staggered mode, the annular grooves on the second valve core and the second static valve disc are not communicated in a staggered mode, and the fuel valve is closed.
CN202010672844.6A 2020-07-14 2020-07-14 Piezoelectric driving large-flow fuel valve Active CN112081938B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114427554A (en) * 2021-12-28 2022-05-03 南京航空航天大学 Piezoelectric stack driven slide valve type high-speed switch valve and control method

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Publication number Priority date Publication date Assignee Title
JPS6078179A (en) * 1983-10-04 1985-05-02 Shoketsu Kinzoku Kogyo Co Ltd Hydraulic control valve
CN207945344U (en) * 2018-02-07 2018-10-09 宜昌天宏建筑工程有限公司 A kind of equipment waterproof placing box for building
CN109882618A (en) * 2019-04-08 2019-06-14 宁波大学科学技术学院 Driving type piezoelectric actuator rotary valve
CN110114601A (en) * 2016-12-26 2019-08-09 株式会社富士金 Piezoelectric element drive-type valve and volume control device
CN111120671A (en) * 2020-01-20 2020-05-08 宁波真格液压科技有限公司 Gate valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078179A (en) * 1983-10-04 1985-05-02 Shoketsu Kinzoku Kogyo Co Ltd Hydraulic control valve
CN110114601A (en) * 2016-12-26 2019-08-09 株式会社富士金 Piezoelectric element drive-type valve and volume control device
CN207945344U (en) * 2018-02-07 2018-10-09 宜昌天宏建筑工程有限公司 A kind of equipment waterproof placing box for building
CN109882618A (en) * 2019-04-08 2019-06-14 宁波大学科学技术学院 Driving type piezoelectric actuator rotary valve
CN111120671A (en) * 2020-01-20 2020-05-08 宁波真格液压科技有限公司 Gate valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114427554A (en) * 2021-12-28 2022-05-03 南京航空航天大学 Piezoelectric stack driven slide valve type high-speed switch valve and control method

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