CN114294278B - Piezoelectric driving hydraulic resistance array pilot-operated flow servo valve - Google Patents
Piezoelectric driving hydraulic resistance array pilot-operated flow servo valve Download PDFInfo
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- CN114294278B CN114294278B CN202111362802.3A CN202111362802A CN114294278B CN 114294278 B CN114294278 B CN 114294278B CN 202111362802 A CN202111362802 A CN 202111362802A CN 114294278 B CN114294278 B CN 114294278B
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Abstract
The invention discloses a piezoelectric driving hydraulic resistance array pilot flow servo valve which comprises a valve body, a valve core, a first return spring and a piezoelectric control module, wherein the valve core is arranged on the valve body; the piezoelectric control module comprises a piezoelectric stack, a second return spring, a baffle plate and a follow-up piston. The invention utilizes the piezoelectric control module to drive the piston to change the liquid resistance of the outlet of the control oil way, thereby realizing the control of the pressure change in the oil cavity of the oil way, further pushing the valve core to move correspondingly through the pressure difference, achieving the purpose of adjusting the flow of fuel oil, and utilizing the displacement sensor to carry out electric feedback, and realizing the adjustment of the displacement of the valve core. The invention has simple structure, reduces the total weight of the valve to a certain extent and can improve the reliability of the valve.
Description
Technical Field
The invention relates to the technical field of fluid control valves, in particular to a piezoelectric driving hydraulic resistance array pilot flow servo valve.
Background
The servo valve is a key element in servo control, and is a hydraulic control valve which receives an analog electric signal and correspondingly outputs a modulated flow and pressure. The servo valve has the advantages of fast dynamic response, high control precision, long service life and the like, and is widely applied to servo control systems in the fields of aviation, aerospace, ships, metallurgy, chemical engineering and the like. However, the traditional servo valve consists of a permanent magnet torque motor, a nozzle, a baffle plate, a valve core, a valve sleeve and a control cavity, the structure is complex, the manufacturing cost is high, and the requirements on the quality and the cleanliness of oil are high, so that a novel servo valve with a simple structure and quick response is urgently needed to meet the requirement on fuel regulation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a piezoelectric driving hydraulic resistance array pilot-operated flow servo valve aiming at the defects related in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a piezoelectric driving hydraulic resistance array pilot flow servo valve comprises a valve body, a valve core, a first return spring and a piezoelectric control module;
the valve body is internally provided with a valve cavity, a control cavity, an operation cavity and a cooling cavity, wherein the valve cavity, the control cavity, the operation cavity and the cooling cavity are all cylindrical, and the control cavity, the operation cavity and the cooling cavity are coaxial in sequence;
the valve core is arranged in the valve cavity and comprises a central rod and first to fourth piston heads, wherein the first to fourth piston heads are sequentially and coaxially fixedly connected through the central rod and can freely slide in the valve cavity; the first to fourth piston heads divide the valve chamber into first to fifth oil chambers in sequence;
the first return spring is arranged in the fifth oil cavity, one end of the first return spring is abutted against the end wall of the valve cavity, and the other end of the first return spring is abutted against the fourth piston head of the valve core;
the side wall of the valve body is provided with an A hole, a P hole, a B hole and an O hole which are communicated with the valve cavity, wherein the A hole is communicated with the third oil cavity, the B hole is communicated with the fourth oil cavity, the P hole and the O hole are respectively and correspondingly arranged at the positions of a third piston and a fourth piston when the valve core is at a zero position, the side wall of the valve body is also provided with a first oil port at the position of the third piston when the valve core is at the zero position, and the side wall of the valve body is provided with a second oil port at the position of a fifth oil cavity;
a first pipeline used for communicating the first oil cavity with the second oil cavity, a second pipeline used for communicating the first oil cavity with the cooling cavity, a third pipeline used for communicating the second oil cavity with the end wall of the control cavity far away from one side of the operation cavity, a fourth pipeline used for communicating the side wall of the control cavity with the middle part of the second pipeline, a fifth pipeline used for communicating the P hole with the middle part of the first pipeline, a sixth pipeline used for communicating the O hole with the first oil port, a seventh pipeline used for communicating the O hole with the second oil port and an eighth pipeline used for communicating the cooling cavity with the fifth oil cavity are arranged in the valve body;
the two ends of the first pipeline are both provided with fixed liquid resistors, and one end of the second pipeline close to the first oil cavity is also provided with a fixed liquid resistor;
the hole P is communicated with an external oil source as an oil inlet, the hole O is communicated with an external oil return box as an oil return hole, the hole A is connected with a port on the rodless side of the single-rod hydraulic cylinder to be driven, and the port B is connected with a port on the rod side of the single-rod hydraulic cylinder to be driven;
the fifth oil cavity is communicated with an external oil return tank through a seventh pipeline all the time; the third oil cavity is always communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole A, and the fourth oil cavity is always communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole B;
when the valve core is in a zero position, the hole P and the hole O are closed;
when the valve core is driven to move towards the fourth piston head direction from the first piston head, the third oil cavity is communicated with an external oil source through a hole P, the fourth oil cavity is communicated with an external oil return box through a hole O, and the sixth pipeline is closed;
when the valve core is driven to move towards the first piston head direction by the fourth piston head, the third oil cavity is communicated with an external oil source through a sixth pipeline and a P hole, and the fourth oil cavity is communicated with the external oil source through the P hole;
first through holes communicated with each other are formed between the control cavity and the operation cavity along the axis of the control cavity, and second through holes communicated with each other are formed between the operation cavity and the cooling cavity along the axis of the operation cavity;
the piezoelectric control module comprises a piezoelectric stack, a second return spring, a baffle plate and a follow-up piston;
the piezoelectric stack is arranged in the cooling cavity, one end of the piezoelectric stack is abutted against the end wall of the cooling cavity far away from the second through hole, and the other end of the piezoelectric stack extends into the operation cavity from the second through hole and is fixedly connected with one side of the baffle; a water-resisting layer is arranged on the outer side of the piezoelectric stack, and the piezoelectric stack is in sealed sliding connection with the cooling cavity at the second through hole;
the piston head of the follow-up piston is arranged in the control cavity, and a piston cylinder of the follow-up piston extends into the operation cavity from the first through hole and is fixedly connected with the other side of the baffle; the second return spring is sleeved on the piston rod of the servo piston, one end of the second return spring abuts against the end wall, far away from the second through hole, of the operation cavity, and the other end of the second return spring abuts against the baffle;
the piezoelectric stack is used for driving the follow-up piston to slide in the control cavity so as to control the opening and closing degree of the fourth pipeline between the control cavity and the third pipeline, and further the pressure difference between the first oil cavity and the second oil cavity is adjusted to drive the valve core to slide.
As a further optimization scheme of the piezoelectric driving hydraulic resistance array pilot flow servo valve, a dynamic sealing GREEN ring is arranged between a piston rod of the follow-up piston and the first through hole.
As a further optimization scheme of the piezoelectric driving hydraulic resistance array pilot-operated flow servo valve, the piezoelectric driving hydraulic resistance array pilot-operated flow servo valve further comprises a displacement sensor, wherein the displacement sensor is arranged on the side wall of the first oil cavity far away from the second oil cavity and used for measuring the displacement of the valve core.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the indirect driving force amplification of medium isolation is realized by using a hydraulic power device, and the high-frequency piezoelectric driving capability is amplified to push the valve core of the servo valve to move;
2. the design is simple, the structure is greatly simplified, the total weight of the valve is reduced to a certain extent, and the reliability of the valve can be improved;
3. because the response of the piezoelectric driver is fast, the valve plug is driven to move, and the overall response speed of the servo valve is fast.
Drawings
FIG. 1 is a schematic cross-sectional view of the internal structure of the present invention;
FIG. 2 isbase:Sub>A schematic cross-sectional view taken along plane A-A of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic cross-sectional view taken along plane B-B of FIG. 1 in accordance with the present invention;
FIG. 4 is a simulated flow-duty cycle characteristic of a servo valve of the present invention;
FIG. 5 is a simulated amplitude-frequency and phase-frequency characteristic diagram of a servo valve of the present invention.
In the figure, 1-a first piston head, 2-a second piston head, 3-a third piston head, 4-a fourth piston head, 5-a central rod, 6-a first oil chamber, 7-a second oil chamber, 8-a third oil chamber, 9-a fourth oil chamber, 10-a fifth oil chamber, 11-a control chamber, 12-an operation chamber, 13-a cooling chamber, 14-a first return spring, 15-a first pipe, 16-a second pipe, 17-a third pipe, 18-a fourth pipe, 19-a fifth pipe, 20-a sixth pipe, 21-a seventh pipe, 22-an eighth pipe, 23-a fixed hydraulic resistance, 24-a piezoelectric stack, 25-a baffle plate, 26-a second return spring, 27-a follow-up piston and 28-a displacement sensor.
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.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, and/or section from another. Thus, a first element, component, and/or section discussed below could be termed a second element, component, or section without departing from the teachings of the present invention.
Referring to fig. 1, 2 and 3, the invention discloses a piezoelectric driving hydraulic resistance array pilot flow servo valve, which comprises a valve body, a valve core, a first return spring and a piezoelectric control module, wherein the valve core is arranged on the valve body;
the valve body is internally provided with a valve cavity, a control cavity, an operation cavity and a cooling cavity, wherein the valve cavity, the control cavity, the operation cavity and the cooling cavity are all cylindrical, and the control cavity, the operation cavity and the cooling cavity are coaxial in sequence;
the valve core is arranged in the valve cavity and comprises a central rod and first to fourth piston heads, wherein the first to fourth piston heads are sequentially and coaxially fixedly connected through the central rod and can freely slide in the valve cavity; the first to fourth piston heads divide the valve chamber into first to fifth oil chambers in sequence;
the first return spring is arranged in the fifth oil cavity, one end of the first return spring is abutted against the end wall of the valve cavity, and the other end of the first return spring is abutted against the fourth piston head of the valve core;
the side wall of the valve body is provided with an A hole, a P hole, a B hole and an O hole which are communicated with the valve cavity, wherein the A hole is communicated with the third oil cavity, the B hole is communicated with the fourth oil cavity, the P hole and the O hole are respectively and correspondingly arranged at the positions of a third piston and a fourth piston when the valve core is at a zero position, the side wall of the valve body is also provided with a first oil port at the position of the third piston when the valve core is at the zero position, and the side wall of the valve body is provided with a second oil port at the position of a fifth oil cavity;
a first pipeline used for communicating the first oil cavity with the second oil cavity, a second pipeline used for communicating the first oil cavity with the cooling cavity, a third pipeline used for communicating the second oil cavity with the end wall of the side, far away from the operation cavity, of the control cavity, a fourth pipeline used for communicating the side wall of the control cavity with the middle of the second pipeline, a fifth pipeline used for communicating the P hole with the middle of the first pipeline, a sixth pipeline used for communicating the O hole with the first oil port, a seventh pipeline used for communicating the O hole with the second oil port, and an eighth pipeline used for communicating the cooling cavity with the fifth oil cavity are arranged in the valve body;
the two ends of the first pipeline are both provided with fixed liquid resistors, and one end of the second pipeline close to the first oil cavity is also provided with a fixed liquid resistor;
the hole P is communicated with an external oil source as an oil inlet, the hole O is communicated with an external oil return box as an oil return hole, the hole A is connected with a port on the rodless side of the single-rod hydraulic cylinder to be driven, and the port B is connected with a port on the rod side of the single-rod hydraulic cylinder to be driven;
the fifth oil cavity is communicated with an external oil return tank through a seventh pipeline all the time; the third oil cavity is communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole A, and the fourth oil cavity is communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole B;
when the valve core is in a zero position, the hole P and the hole O are closed;
when the valve core is driven to move towards the fourth piston head direction from the first piston head, the third oil cavity is communicated with an external oil source through a P hole, the fourth oil cavity is communicated with an external oil return box through an O hole, and the sixth pipeline is closed;
when the valve core is driven to move towards the first piston head direction by the fourth piston head, the third oil chamber is communicated with an external oil source through a sixth pipeline and a P hole, and the fourth oil chamber is communicated with the external oil source through the P hole;
first through holes communicated with each other are formed between the control cavity and the operation cavity along the axis of the control cavity, and second through holes communicated with each other are formed between the operation cavity and the cooling cavity along the axis of the operation cavity;
the piezoelectric control module comprises a piezoelectric stack, a second return spring, a baffle plate and a follow-up piston;
the piezoelectric stack is arranged in the cooling cavity, one end of the piezoelectric stack is abutted against the end wall of the cooling cavity far away from the second through hole, and the other end of the piezoelectric stack extends into the operation cavity from the second through hole and is fixedly connected with one side of the baffle; a water-resisting layer is arranged on the outer side of the piezoelectric stack, and the piezoelectric stack is hermetically and slidably connected with the cooling cavity at the second through hole;
the piston head of the follow-up piston is arranged in the control cavity, and the piston cylinder of the follow-up piston extends into the operation cavity from the first through hole and is fixedly connected with the other side of the baffle; the second return spring is sleeved on a piston rod of the servo piston, one end of the second return spring abuts against the end wall, far away from the second through hole, of the operation cavity, and the other end of the second return spring abuts against the baffle;
the piezoelectric stack is used for driving the follow-up piston to slide in the control cavity so as to control the opening and closing degree of the fourth pipeline between the control cavity and the third pipeline, and further the pressure difference between the first oil cavity and the second oil cavity is adjusted to drive the valve core to slide.
And a dynamic sealing GREEN is arranged between the piston rod of the follow-up piston and the first through hole.
The invention can further comprise a displacement sensor which is arranged on the side wall of the first oil cavity far away from the second oil cavity and used for measuring the displacement of the valve core.
When the piezoelectric driving hydraulic resistance array pilot-operated flow servo valve needs to be opened, a sinusoidal excitation voltage is applied to the piezoelectric stack, the piezoelectric stack deforms, the deformation acts on the baffle plate so as to push the piston rod of the follow-up piston to move, the area of an outlet oil way of the second oil cavity is changed after the piston head of the follow-up piston moves, and therefore the pressure inside the second oil cavity is changed; when the valve core is driven to move towards the first piston head direction by the fourth piston head, the third oil cavity is communicated with an external oil source through a sixth pipeline and a P hole, and the fourth oil cavity is communicated with the external oil source through the P hole; the pressure difference between the hole A and the hole B pushes the single-rod hydraulic cylinder to work.
By controlling the size of the sine excitation voltage, the deformation amount of the piezoelectric stack can be controlled, and then the opening degree of an outlet oil way of the second oil cavity is controlled, so that adjustment is realized.
When the piezoelectric driving hydraulic resistance array pilot flow servo valve needs to be closed, voltage application to the piezoelectric stack is stopped, control oil in the control oil path returns to the oil return tank through the O hole, the servo piston returns to the initial position under the action of the second return spring, the pressure in the first cavity and the pressure in the second cavity are equal, and the valve core returns to the initial position under the action of the first return spring.
The piezoelectric stack is arranged in the cooling cavity and is cooled through return oil.
As shown in fig. 4, after the modeling of the piezoelectric-driven hydraulic resistance array pilot flow servo valve is simulated, a flow-duty ratio characteristic curve of the servo valve is obtained, and it can be found that the valve has good linearity and a small saturation region exists at a high duty ratio.
As shown in fig. 5, the amplitude-frequency characteristic of the servo valve is obtained after the modeling of the piezoelectric driving hydraulic resistance array pilot flow servo valve is simulated, and the amplitude frequency is 30Hz when the amplitude ratio is-3 db; the phase frequency characteristic of the servo valve is that the phase frequency is 30Hz when the phase angle is-90 deg.
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 examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, 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 driving liquid resistance array pilot-operated flow servo valve is characterized by comprising a valve body, a valve core, a first return spring and a piezoelectric control module;
the valve body is internally provided with a valve cavity, a control cavity, an operation cavity and a cooling cavity, wherein the valve cavity, the control cavity, the operation cavity and the cooling cavity are all cylindrical, and the control cavity, the operation cavity and the cooling cavity are coaxial in sequence;
the valve core is arranged in the valve cavity and comprises a central rod and first to fourth piston heads, wherein the first to fourth piston heads are sequentially and coaxially fixedly connected through the central rod and can freely slide in the valve cavity; the first to fourth piston heads divide the valve chamber into first to fifth oil chambers in sequence;
the first return spring is arranged in the fifth oil cavity, one end of the first return spring is abutted against the end wall of the valve cavity, and the other end of the first return spring is abutted against the fourth piston head of the valve core;
the side wall of the valve body is provided with an A hole, a P hole, a B hole and an O hole which are communicated with the valve cavity, wherein the A hole is communicated with the third oil cavity, the B hole is communicated with the fourth oil cavity, the P hole and the O hole are respectively and correspondingly arranged at the positions of a third piston and a fourth piston when the valve core is at a zero position, the side wall of the valve body is also provided with a first oil port at the position of the third piston when the valve core is at the zero position, and the side wall of the valve body is provided with a second oil port at the position of a fifth oil cavity;
a first pipeline used for communicating the first oil cavity with the second oil cavity, a second pipeline used for communicating the first oil cavity with the cooling cavity, a third pipeline used for communicating the second oil cavity with the end wall of the control cavity far away from one side of the operation cavity, a fourth pipeline used for communicating the side wall of the control cavity with the middle part of the second pipeline, a fifth pipeline used for communicating the P hole with the middle part of the first pipeline, a sixth pipeline used for communicating the O hole with the first oil port, a seventh pipeline used for communicating the O hole with the second oil port and an eighth pipeline used for communicating the cooling cavity with the fifth oil cavity are arranged in the valve body;
the two ends of the first pipeline are both provided with fixed liquid resistors, and one end of the second pipeline close to the first oil cavity is also provided with a fixed liquid resistor;
the hole P is communicated with an external oil source as an oil inlet, the hole O is communicated with an external oil return box as an oil return hole, the hole A is connected with a port on the rodless side of the single-rod hydraulic cylinder to be driven, and the port B is connected with a port on the rod side of the single-rod hydraulic cylinder to be driven;
the fifth oil cavity is communicated with an external oil return tank through a seventh pipeline all the time; the third oil cavity is always communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole A, and the fourth oil cavity is always communicated with a joint on the rodless side of the single-rod hydraulic cylinder to be driven through the hole B;
when the valve core is in a zero position, the hole P and the hole O are closed;
when the valve core is driven to move towards the fourth piston head direction from the first piston head, the third oil cavity is communicated with an external oil source through a P hole, the fourth oil cavity is communicated with an external oil return box through an O hole, and the sixth pipeline is closed;
when the valve core is driven to move towards the first piston head direction by the fourth piston head, the third oil chamber is communicated with an external oil source through a sixth pipeline and a P hole, and the fourth oil chamber is communicated with the external oil source through the P hole;
first through holes communicated with each other are formed between the control cavity and the operation cavity along the axis of the control cavity, and second through holes communicated with each other are formed between the operation cavity and the cooling cavity along the axis of the operation cavity;
the piezoelectric control module comprises a piezoelectric stack, a second return spring, a baffle plate and a follow-up piston;
the piezoelectric stack is arranged in the cooling cavity, one end of the piezoelectric stack is abutted against the end wall of the cooling cavity far away from the second through hole, and the other end of the piezoelectric stack extends into the operation cavity from the second through hole and is fixedly connected with one side of the baffle; a water-resisting layer is arranged on the outer side of the piezoelectric stack, and the piezoelectric stack is hermetically and slidably connected with the cooling cavity at the second through hole;
the piston head of the follow-up piston is arranged in the control cavity, and the piston cylinder of the follow-up piston extends into the operation cavity from the first through hole and is fixedly connected with the other side of the baffle; the second return spring is sleeved on a piston rod of the servo piston, one end of the second return spring abuts against the end wall, far away from the second through hole, of the operation cavity, and the other end of the second return spring abuts against the baffle;
the piezoelectric stack is used for driving the follow-up piston to slide in the control cavity so as to control the opening and closing degree of the fourth pipeline between the control cavity and the third pipeline, and further the pressure difference between the first oil cavity and the second oil cavity is adjusted to drive the valve element to slide.
2. The piezoelectric driven hydraulic resistance array pilot operated flow servo valve according to claim 1, wherein a dynamic sealing Gray ring is arranged between the piston rod of the follower piston and the first through hole.
3. The piezoelectric actuated hydraulic resistor array pilot operated flow servo valve as claimed in claim 1, further comprising a displacement sensor disposed on a side wall of the first oil chamber remote from the second oil chamber for measuring displacement of the spool.
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| CN202111362802.3A CN114294278B (en) | 2021-11-17 | 2021-11-17 | Piezoelectric driving hydraulic resistance array pilot-operated flow servo valve |
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| CN202111362802.3A CN114294278B (en) | 2021-11-17 | 2021-11-17 | Piezoelectric driving hydraulic resistance array pilot-operated flow servo valve |
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| CN114294278B true CN114294278B (en) | 2022-10-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201602482A (en) * | 2014-02-24 | 2016-01-16 | Fujikin Kk | Piezoelectric linear actuator, piezoelectrically driven valve, and flow rate control device |
| EP3269950A1 (en) * | 2016-07-14 | 2018-01-17 | Wagner GmbH & Co. KG | Control valve for supplying one or more nozzles with a pressurized fluid |
| CN108843639A (en) * | 2018-06-04 | 2018-11-20 | 江苏理工学院 | A kind of novel piezoelectric ceramic type jet action valve valve group |
| CN112594243A (en) * | 2020-12-14 | 2021-04-02 | 上海航天控制技术研究所 | Piezoelectric type electro-hydraulic servo valve and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11608840B2 (en) * | 2018-08-21 | 2023-03-21 | Michael Yuan | Piezoelectric ring bender servo valve assembly for aircraft flight control actuation and fuel control systems |
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- 2021-11-17 CN CN202111362802.3A patent/CN114294278B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201602482A (en) * | 2014-02-24 | 2016-01-16 | Fujikin Kk | Piezoelectric linear actuator, piezoelectrically driven valve, and flow rate control device |
| EP3269950A1 (en) * | 2016-07-14 | 2018-01-17 | Wagner GmbH & Co. KG | Control valve for supplying one or more nozzles with a pressurized fluid |
| CN108843639A (en) * | 2018-06-04 | 2018-11-20 | 江苏理工学院 | A kind of novel piezoelectric ceramic type jet action valve valve group |
| CN112594243A (en) * | 2020-12-14 | 2021-04-02 | 上海航天控制技术研究所 | Piezoelectric type electro-hydraulic servo valve and control method thereof |
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