CN201187585Y - High speed switch valve driven by piezo crystal - Google Patents
High speed switch valve driven by piezo crystal Download PDFInfo
- Publication number
- CN201187585Y CN201187585Y CNU2008200843017U CN200820084301U CN201187585Y CN 201187585 Y CN201187585 Y CN 201187585Y CN U2008200843017 U CNU2008200843017 U CN U2008200843017U CN 200820084301 U CN200820084301 U CN 200820084301U CN 201187585 Y CN201187585 Y CN 201187585Y
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- CN
- China
- Prior art keywords
- valve
- spool
- valve body
- piezoelectric crystal
- high speed
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- Expired - Lifetime
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Abstract
The utility model discloses a piezoelectric crystal driven high speed switch valve. Piezoelectric crystals are respectively arranged at both ends of a valve body, a tapered valve and slide valve mixed structure is installed in a valve body hole between the piezoelectric crystals to slide in the hole of a valve sleeve inserted in the valve body and the hole of the valve body, and is provided with a certain overlapping degree of valve ports, damping springs are arranged between a valve core and the valve sleeve and between the valve core and a baffle sheet, and thermal shrinkage sheets are inserted between the piezoelectric crystals and a chosen end cover. The impact property of a piezoelectric crystal executor is utilized to solve the defect of small output displacement of the piezoelectric crystals; the slide valve structure is utilized to reinforce the loading capability and to increase the motion course of the valve core; the dumping springs are arranged to decrease the vibration generated due to the high speed impulsion of the valve core; temperature compensating gauges are added to solve the problem that the piezoelectric crystals are greatly influenced by the temperature, therefore, the high speed switch valve which can simultaneously satisfy the requirements of high speed, high pressure and mass flow is realized.
Description
Technical field
The utility model relates to electric liquid conversion and control element, especially relates to a kind of piezo crystal drive high speed switch valve.
Background technique
High-speed switch valve is as a kind of new digital formula electricity liquid conversion and control element, adopt the pulse flow control mode, realize high-precision pressure, flow control, have that volume is little, reliability is high, antipollution and advantages of simple structure and simple, extensive application prospect and development potentiality.Digital valve realizes trace control to improve response frequency, and high more its control accuracy of frequency response is just high more.
At present, there is the contradiction between high-speed response and high pressure, the big flow in high-speed switch valve.Because the driver of high-speed switch valve mainly is a strong electromagnet at present, the general response time is several milliseconds, and improving electromagnetic force needs more Number of ampere turns, causes the solenoid valve heating, complex structure, volume are bigger, and the response capability that further improves solenoid valve has run into restriction.
The piezoelectric crystal driver is a kind of next-generation drive that development in recent years is got up, and has following characteristics:
1) response is fast, can reach GHz; And the electromagnetic driver frequency response is below hundreds of Hz.
2) ouput force is big, can reach more than the kN, and the electromagnetic driver ouput force is usually below 50N.
3) low in energy consumption, than the low order of magnitude of electromagnetic actuator.
But piezoelectric crystal output displacement only accounts for 0.1% of its length, is generally tens microns, is significantly smaller than hydrovalve spool travel (millimeter level).Therefore, need will could drive spool after its displacement amplification.Methods such as the lever amplification of adopting in the world, the displacement amplification of buckling, hydraulic pressure amplification all do not solve piezoelectric crystal micrometric displacement scale-up problem well at present, cause the flow of piezoelectric crystal digital valve all little.
Simultaneously after the piezoelectric crystal high frequency stretches work a period of time, can produce certain heat, the piezoelectric crystal temperature is risen, thereby produce certain flexible expansion of micron order heat, with itself micron-sized work collapsing length on the same order of magnitude, can cause very big uncontrollable flexible error.Therefore must carry out temperature correction to it.
High-speed switch valve is worked under high frequency sound, and spool high-speed motion bump valve seat has the vibration rebound phenomenon, must increase damping with in elimination.
Summary of the invention
The purpose of this utility model is to provide a kind of piezo crystal drive high speed switch valve, utilize the characteristic of its high frequency sound and high ouput force, solve the contradiction between high-speed switch valve high frequency sound and high pressure, big flow, overcome the low output of piezoelectric crystal displacement simultaneously, the output displacement is to problems such as temperature variation sensitivities.
The technological scheme that its technical problem that solves the utility model adopts is as follows:
The first driver overcoat is housed in valve body one stomidium, in the first driver overcoat first piezoelectric crystal is housed, first piezoelectric crystal is equipped with the first pyrocondensation sheet near an end in the valve body outside, and the first pyrocondensation sheet is embedded in first end cap, in the valve body hole of the first piezoelectric crystal the other end valve pocket is housed; The second driver overcoat is housed in another stomidium of valve body, in the second driver overcoat second piezoelectric crystal is housed, second piezoelectric crystal is equipped with the second pyrocondensation sheet near an end in the valve body outside, the second pyrocondensation sheet is embedded in second end cap, and the other end of second piezoelectric crystal is connected with catch through second damping spring; Spool is contained in the valve body hole, the cylinder sliding parts A of spool one end can slide in the valve pocket hole, the shoulder face of the cone valve part of spool is connected with first damping spring with valve pocket, the cone valve part and the valve port of spool contact, form valve pocket between two cylinder sliding partss being made up of two cylinder sliding partss of the spool the other end, two cylinder sliding partss, can slide in valve body hole, the end face of the spool the other end withstands on the catch end face; Have return opening on the valve body between second damping spring and catch, have the high pressure oil import on the valve body of spool cone valve part, have the outlet of digital valve fluid on the valve body of spool cone valve part and the other end cylinder sliding parts.The outlet of high pressure oil import and fluid can be communicated with, fluid export with two cylinder sliding partss between the valve pocket that forms can be communicated with, the valve pocket that forms between return opening and two cylinder sliding partss can be communicated with.
The beneficial effect that the utlity model has is:
Reach the high frequency sound except utilizing piezoelectric crystal response characteristic fast, that ouput force is big to improve, design a kind of cone valve-guiding valve mixed construction, utilize the impact characteristics of piezoelectric crystal final controlling element to solve the little defective of piezoelectric crystal output displacement; Utilize sliding valve structure to strengthen its carrying load ability and increase its valve core movement stroke; Damping spring is set, reduces the vibration that the spool high speed impact produces; Increase the temperature correction sheet, solve the big problem of piezoelectric crystal temperature influence.Realize a kind of high-speed switch valve that can satisfy high speed, high pressure, big traffic requirement simultaneously.
1) the frequency response response is high, can reach more than the 200Hz;
2) working pressure height can reach 20MPa;
3) output flow is big, can reach 10L/min;
4) carrying load ability is strong;
5) switch performance of valve is not acted upon by temperature changes.
Description of drawings
Accompanying drawing is a piezoelectric crystal digital valve structural principle schematic representation.
Among the figure: 1. piezoelectric crystal, 2. piezoelectric crystal, 3. spool, 4. valve body, 5. valve pocket, 6. end cap, 7. end cap, 8. pyrocondensation sheet, 9. pyrocondensation sheet, 10. driver overcoat, 11. driver overcoats, 12. damping springs, 13. damping spring, 14. seal rings, 15. catch, P1. high-voltage oil liquid import, the outlet of P2. high-voltage oil liquid, Pt. return opening.
Embodiment
As shown in drawings, the utility model is equipped with the first driver overcoat 10 in valve body 4 one stomidiums, first piezoelectric crystal 2 is housed in the first driver overcoat 10, first piezoelectric crystal 2 is equipped with the first pyrocondensation sheet 9 near an end in valve body 4 outsides, the first pyrocondensation sheet 9 is embedded in first end cap 6, in valve body 4 holes of first piezoelectric crystal, 2 the other ends valve pocket 5 is housed; In valve body 4 another stomidiums the second driver overcoat 10 is housed, second piezoelectric crystal 1 is housed in the second driver overcoat 10, second piezoelectric crystal 1 is equipped with the second pyrocondensation sheet 8 near an end in valve body 4 outsides, the second pyrocondensation sheet 8 is embedded in second end cap 6, and the other end of second piezoelectric crystal 2 is connected with catch 15 through second damping spring 12; Spool 3 is contained in valve body 4 holes, the cylinder sliding parts A of spool 3 one ends can slide in valve pocket 5 holes, the shoulder face of the cone valve part of spool 3 is connected with valve pocket 5 usefulness first damping spring 12, the cone valve part and the valve port of spool 3 contact, form valve pocket between two cylinder sliding partss being made up of two cylinder sliding partss of spool 3 the other ends, two cylinder sliding partss, can slide in valve body 4 holes, the end face of spool 3 the other ends withstands on catch 15 end faces; Have return opening on the valve body 4 that second damping spring 12 and catch are 15, have the high pressure oil import on the valve body 4 of spool 3 cone valves parts, have the outlet of digital valve fluid on the valve body 4 of spool 3 cone valves part and the other end cylinder sliding parts.The outlet of high pressure oil import and fluid can be communicated with, fluid export with two cylinder sliding partss between the valve pocket that forms can be communicated with, the valve pocket that forms between return opening and two cylinder sliding partss can be communicated with.Described piezoelectric crystal is PZT piezoelectric crystal heap.
Working principle is as follows:
The utility model utilizes piezo actuator high frequency sound, high ouput force characteristic to propose a kind of novel high speed switch valve structure, sees accompanying drawing.High-speed switch valve has 3 hydraulic fluid ports, logical respectively high pressure oil (p
1), load (p
2), fuel tank (p
t); The spool of high-speed switch valve is made up of A, B, C three parts, controls valve port a, b, c respectively.Wherein a is for being the cone valve valve port, the switch of control oil inlet and outlet.B, c are the guiding valve valve port, by its positive under lap opening amount is set, can be after spool to be washed open certain displacement, and certain displacement is opened and remained on to auxiliary spool, closes when spool is closed simultaneously in good time, makes spool remain on stable closed condition.Control high-voltage oil liquid p by 2 piezoelectric crystals 1,2
1With induced pressure p
2Break-make.
Under the normal condition: spool is in pressure p
1Effect under, valve port a, b close, valve port c opens, the valve pocket that forms between return opening and two cylinder sliding partss is communicated with; Since the structure of spool among the figure, pressure p
2To the spool active force near 0.Open spool: piezoelectric crystal 2 gets electric, the above momentary force F of output 2kN
PZT2Impact spool, make spool accelerated motion and open valve port a, induced pressure p rapidly
2Rise rapidly; Simultaneously because spool moves right, make that valve port b opens gradually, valve port c closes gradually, the valve pocket that forms between fluid outlet and two cylinder sliding partss is communicated with, and the interior pressure of valve pocket is raise gradually and near p
2, because the cross-section area of spool B is slightly larger than spool C, whole spool is able to continue to move right under thrust, arrives the terminal point of spool, and in the effect stop motion of spring damping.Close spool: piezoelectric crystal 1 gets electric, the above momentary force F of output 2kN
PZT1Impact spool, make spool accelerated motion left, valve port a and b close gradually, and valve port c opens gradually, and the pressure in the valve pocket reduces rapidly and near tank pressure p
t, causing the directive effect power increase left of whole spool, spool keeps motion state left, and in the effect stop motion of destination county at spring damping.Limit the final output displacement of spool by the displacement of the screw-in end cap amount of being selected into can regulate spool.Pyrocondensation sheet its length after temperature raises reduces to compensate the elongation that the piezoelectric actuator thermal expansion is caused.
This high-speed switch valve utilizes the high ouput force of the instantaneous generation of piezoelectric crystal, promotes spool high speed operation under high pressure, exports big flow (spool travel can reach more than the 0.7mm).Because what utilize is the impact characteristics of piezo crystals height ouput force, its output displacement does not exert an influence to the realization of high-speed switch valve function, therefore overcome the unsettled defective of output displacement under the little and temperature variation of piezoelectric crystal output displacement, solved the contradiction between high-speed switch valve high frequency sound, high pressure, big flow simultaneously.
Claims (2)
1. piezo crystal drive high speed switch valve, it is characterized in that: the first driver overcoat (10) is housed in valve body (4) one stomidiums, in the first driver overcoat (10) first piezoelectric crystal (2) is housed, first piezoelectric crystal (2) is equipped with the first pyrocondensation sheet (9) near an end in valve body (4) outside, the first pyrocondensation sheet (9) is embedded in first end cap (6), in valve body (4) hole of first piezoelectric crystal (2) the other end valve pocket (5) is housed; The second driver overcoat (10) is housed in another stomidium of valve body (4), in the second driver overcoat (10) second piezoelectric crystal (1) is housed, second piezoelectric crystal (1) is equipped with the second pyrocondensation sheet (8) near an end in valve body (4) outside, the second pyrocondensation sheet (8) is embedded in second end cap (6), and the other end of second piezoelectric crystal (2) is connected with catch (15) through second damping spring (12); Spool (3) is contained in valve body (4) hole, the cylinder sliding parts A of spool (3) one ends can slide in valve pocket (5) hole, the shoulder face of the cone valve part of spool (3) is connected with first damping spring (12) with valve pocket (5), the cone valve part and the valve port of spool (3) contact, forming of spool (3) the other end by two cylinder sliding partss, form valve pocket between two cylinder sliding partss, two cylinder sliding partss, can slide in valve body (4) hole, the end face of spool (3) the other end withstands on catch (15) end face; Have return opening on the valve body (4) between second damping spring (12) and catch (15), have the high pressure oil import on the valve body (4) of spool (3) cone valve part, have the outlet of digital valve fluid on the valve body (4) of spool (3) cone valve part and the other end cylinder sliding parts, the high pressure oil import can be communicated with the fluid outlet, the valve pocket that forms between fluid outlet and two cylinder sliding partss can be communicated with, and the valve pocket that forms between return opening and two cylinder sliding partss can be communicated with.
2. a kind of piezo crystal drive high speed switch valve according to claim 1 is characterized in that: described piezoelectric crystal is PZT piezoelectric crystal heap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200843017U CN201187585Y (en) | 2008-03-11 | 2008-03-11 | High speed switch valve driven by piezo crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200843017U CN201187585Y (en) | 2008-03-11 | 2008-03-11 | High speed switch valve driven by piezo crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201187585Y true CN201187585Y (en) | 2009-01-28 |
Family
ID=40310607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200843017U Expired - Lifetime CN201187585Y (en) | 2008-03-11 | 2008-03-11 | High speed switch valve driven by piezo crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201187585Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100535486C (en) * | 2008-03-11 | 2009-09-02 | 浙江大学 | Piezo crystal drive high speed switch valve |
| WO2010135902A1 (en) * | 2009-05-27 | 2010-12-02 | 泸州川油钻采工具有限公司 | High-low pressure pilot valve |
| CN102797721A (en) * | 2012-08-19 | 2012-11-28 | 杭州宇控机电工程有限公司 | Direct-acting large-flow high-speed switching electromagnetic valve |
| CN103047444A (en) * | 2012-12-05 | 2013-04-17 | 昆明理工大学 | Water-base hydraulic electrostriction high speed switch valve |
| CN110762065A (en) * | 2019-10-30 | 2020-02-07 | 燕山大学 | Digital hydraulic actuator system for closed pump valve composite speed regulation and control method thereof |
| CN111629839A (en) * | 2018-02-09 | 2020-09-04 | 阿特拉斯柯普科工业技术(德国)有限公司 | Metering valve |
| CN111946878A (en) * | 2020-08-14 | 2020-11-17 | 哲弗智能系统（上海）有限公司 | Sub-control valve, fire extinguishing device and fire extinguishing system |
-
2008
- 2008-03-11 CN CNU2008200843017U patent/CN201187585Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100535486C (en) * | 2008-03-11 | 2009-09-02 | 浙江大学 | Piezo crystal drive high speed switch valve |
| WO2010135902A1 (en) * | 2009-05-27 | 2010-12-02 | 泸州川油钻采工具有限公司 | High-low pressure pilot valve |
| CN102797721A (en) * | 2012-08-19 | 2012-11-28 | 杭州宇控机电工程有限公司 | Direct-acting large-flow high-speed switching electromagnetic valve |
| CN102797721B (en) * | 2012-08-19 | 2015-02-25 | 杭州宇控机电工程有限公司 | Direct-acting large-flow high-speed switching electromagnetic valve |
| CN103047444A (en) * | 2012-12-05 | 2013-04-17 | 昆明理工大学 | Water-base hydraulic electrostriction high speed switch valve |
| CN111629839A (en) * | 2018-02-09 | 2020-09-04 | 阿特拉斯柯普科工业技术(德国)有限公司 | Metering valve |
| CN111629839B (en) * | 2018-02-09 | 2022-05-31 | 阿特拉斯柯普科工业技术(德国)有限公司 | Metering valve |
| CN110762065A (en) * | 2019-10-30 | 2020-02-07 | 燕山大学 | Digital hydraulic actuator system for closed pump valve composite speed regulation and control method thereof |
| CN111946878A (en) * | 2020-08-14 | 2020-11-17 | 哲弗智能系统（上海）有限公司 | Sub-control valve, fire extinguishing device and fire extinguishing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080311 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |