CN111059322B - Pneumatic servo valve with air-floating sliding pair - Google Patents
Pneumatic servo valve with air-floating sliding pair Download PDFInfo
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- CN111059322B CN111059322B CN201911354415.8A CN201911354415A CN111059322B CN 111059322 B CN111059322 B CN 111059322B CN 201911354415 A CN201911354415 A CN 201911354415A CN 111059322 B CN111059322 B CN 111059322B
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- valve
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- valve core
- pneumatic servo
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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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
- F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
- F16K11/07—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides
- F16K11/0708—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members with cylindrical slides comprising means to avoid jamming of the slide or means to modify the flow
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves
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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
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0083—For recording or indicating the functioning of a valve in combination with test equipment by measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention belongs to the field of pneumatic valves and discloses a pneumatic servo valve with an air-floating sliding pair. The pneumatic servo valve is internally provided with an air-floating type sliding pair and comprises a valve core and a valve sleeve, wherein the valve core is arranged in the valve sleeve, air-floating type valve shoulders are arranged at two ends of the valve core and are cylindrical, a blind hole communicated with a central hole of the valve core is arranged in the middle of the valve core, a plurality of grooves communicated with the blind hole are formed in the air-floating type valve shoulders along the circumferential direction, each groove and the inner wall of the valve sleeve form a static pressure supporting cavity, when gas is introduced into the central hole of the valve core, the gas enters the static pressure supporting cavity, and the valve core is suspended in the valve sleeve through the pressure of the gas in the static pressure supporting cavity, so that the friction between the valve core and the inner wall of the valve. The invention solves the problems of low sensitivity of the valve core action and short service life caused by the friction and the abrasion between the sliding pairs of the valve core and the valve sleeve of the traditional pneumatic servo valve, and simultaneously improves the control precision and the dynamic response of the pneumatic servo valve.
Description
Technical Field
The invention belongs to the field of pneumatic valves, and particularly relates to a pneumatic servo valve with an air-floating sliding pair.
Background
The pneumatic technology has the advantages of low cost, clean energy, no pollution, easy operation and the like because the working medium is compressed air, and is widely applied to various fields of modern industry. The performance of the pneumatic servo system depends to a large extent on the control accuracy, dynamic and static performance of the pneumatic servo valve used, and therefore, it is important to improve the performance of the pneumatic servo valve by improving the parameters and indexes of the pneumatic servo valve.
In recent decades, the pneumatic servo valve is rarely researched at home and abroad, and particularly, no scholars propose the pneumatic servo valve with an air floating type sliding pair, the pneumatic servo valve is used as a high-response and high-precision precise component, a static pressure supporting structure is applied to reduce the friction and the wear between a valve core and a valve sleeve, the valve core action sensitivity of the pneumatic servo valve is improved, and the service life of the pneumatic servo valve is prolonged. The pneumatic servo valve has wide application prospect in the control field with higher requirements on control precision and dynamic response, in particular to the aerospace and national defense military field.
The air-floating sliding pair mainly adopts a static pressure supporting structure. The hydrostatic bearing is characterized in that fluid with certain pressure is supplied between friction surfaces by an external fluid pressure source and is loaded by hydrostatic pressure to reduce friction damping. At present, the structure of the static pressure bearing is widely adopted in the industries of metallurgy, electric power, mechanical manufacturing, aviation, aerospace and hydraulic pressure, and is mainly applied to precise and ultra-precise manufacturing equipment, such as ultra-precise machine tools, photoetching machines, high-speed spindles, micro-turbine engines, zero-gravity simulation systems, medical equipment and the like. For the hydraulic industry, hydrostatic bearings are mainly used in hydraulic cylinders and plunger pumps. The Chinese invention patent (CN108895056A) provides a hydraulic cylinder of a static pressure cavity supporting and guiding device, which is provided with two static pressure supporting cavities, two damping holes and two leakage grooves and has the characteristics of simple structure, low friction, high frequency response, long service life, high reliability and no external leakage. The invention patent (CN105673478A) in China is a slipper pair based on static pressure support, a sufficient and stable oil film is formed between the slipper pair and a swash plate, the friction coefficient is reduced, the phenomenon that the slipper pair is abraded due to unstable oil pressure and inaccurate structure is relieved, and the technical defects that the conventional axial plunger motor is large in friction coefficient, large in energy loss, easy to abrade, short in service life and low in mechanical efficiency are overcome.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides the pneumatic servo valve with the air-floating type sliding pair, the air-floating type valve shoulders are arranged at the two ends of the valve core, so that the valve core floats in the valve sleeve through a static pressure supporting cavity formed by the air-floating type valve shoulders and the valve sleeve after air is introduced into the valve core, the frictional contact with the valve sleeve is avoided, the problems of low action sensitivity and short service life of the valve core caused by frictional wear between the sliding pair of the valve core and the valve sleeve of the conventional pneumatic servo valve are solved, and the control precision and the dynamic response of the pneumatic servo valve are improved.
To achieve the above object, according to the present invention, there is provided a pneumatic servo valve with an air-floating slide pair, the pneumatic servo valve having the air-floating slide pair disposed therein, wherein:
the air-floating sliding pair comprises a valve core and a valve sleeve, the valve core is arranged in the valve sleeve, air-floating valve shoulders are arranged at two ends of the valve core, the air-floating valve shoulder is arranged in the valve sleeve and is in clearance fit with the valve sleeve, the air-floating valve shoulder is cylindrical, a blind hole communicated with the central hole of the valve core is arranged in the middle of the air-floating valve shoulder, the air-floating valve shoulder is provided with a plurality of grooves communicated with the blind holes along the circumferential direction, each groove and the inner wall of the valve sleeve form a static pressure supporting cavity, when gas is introduced into the central hole of the valve core, the gas enters the static pressure supporting cavity through the blind hole, an air film is formed between the air floating type valve shoulder and the inner wall of the valve sleeve, the pressure of air in the static pressure supporting cavity acts on the valve core, and the valve core is suspended in the valve sleeve through the cooperation of the static pressure supporting cavities, so that the friction between the valve core and the inner wall of the valve sleeve during the transverse movement of the valve core is reduced.
Further preferably, a damping hole and a processing hole are arranged between the groove and the blind hole, the communication between the groove and the blind hole is realized through the damping hole and the processing hole, the damping hole is used for ensuring the pressure of the static pressure supporting cavity, and the processing hole is used for connecting the damping hole and the groove and is convenient for processing the damping hole.
Further preferably, the number of the grooves is even, and when gas is discharged from the grooves, the balance of the valve core in all directions is ensured.
Further preferably, the number of the grooves is 4, and the range of an included angle formed by a connecting line of the end point of the groove in the width direction and the center of the valve core is 20-90 degrees.
Further preferably, the pneumatic servo valve is a three-position five-way servo valve or a three-position three-way valve.
Further preferably, the pneumatic servo valve further comprises a driving unit and a displacement detection unit, the driving unit is connected to one end of the valve core and used for driving the valve core to move transversely in the valve sleeve, and the displacement detection unit is used for detecting the transverse displacement of the valve core in real time.
Further preferably, the driving unit and the displacement detection unit are respectively connected with a controller, the displacement detection unit transmits a detection result to the controller, and the controller regulates and controls the driving unit to drive the valve core to move.
In general, the above technical solutions contemplated by the present invention can achieve the following advantageous effects compared to the prior art.
1. According to the pneumatic servo valve, the air-floating valve shoulder is arranged on the valve core, the plurality of grooves are arranged on the circumference of the air-floating valve shoulder, the grooves and the inner wall of the valve sleeve form a cavity, namely a static pressure bearing cavity, when air is introduced into the valve core, the air enters the cavity formed by the grooves and the valve sleeve to carry out static pressure support on the valve core, and an air film formed by the air is formed between the valve shoulder and the valve sleeve, so that the valve core is not in direct contact with the inner wall of the valve sleeve, the friction force of the valve core during transverse movement is reduced, the friction damping is reduced, the abrasion phenomenon of the valve core and the valve sleeve is reduced, the action sensitivity of the valve core is improved, and the service life and;
2. according to the invention, the number of the grooves is set to be 4, and the range of an included angle formed by a connecting line of the end point of the width direction of each groove and the circle center is 20-90 degrees, so that on one hand, the number of the holes is controlled within a certain number, the processing complexity is reduced, and on the other hand, the static pressure supporting effect of gas on the valve core within the range of the included angle is ensured;
3. the damping hole is set, the diameter of the damping hole is related to the valve body, the valve core and the valve sleeve, the damping hole is mainly used for guaranteeing the pressure in the static pressure supporting cavity, the diameter of the damping hole cannot be too large or too small, the pressure in the static pressure supporting cavity cannot be guaranteed if the damping hole is too large, the valve core is directly jacked if the pressure in the static pressure supporting cavity is too small, and static pressure balance cannot be achieved.
Drawings
FIG. 1 is a perspective cutaway view of an air-float valve shoulder constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a top cross-sectional view of an air-float valve shoulder in a valve housing constructed in accordance with a preferred embodiment of the present invention;
FIG. 3 is a schematic illustration of an air-float valve shoulder constructed in accordance with a preferred embodiment of the present invention in a valve housing;
FIG. 4 is a schematic cross-sectional view of an air-float valve shoulder in a valve housing constructed in accordance with a preferred embodiment of the present invention;
FIG. 5 is a cross-sectional view of an air-float valve shoulder constructed in accordance with a preferred embodiment of the present invention;
fig. 6 is a schematic diagram of a pneumatic servo valve constructed in accordance with a preferred embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the method comprises the following steps of 1-a displacement sensor, 2-a fastening nut, 3-a displacement sensor mounting seat, 4-a displacement sensor positioning plate, 5-a valve core, 6-a valve sleeve, 7-an O-shaped sealing ring, 8-a valve body, 9-a motor positioning sleeve, 10-a driving unit, 11-a controller, 12-a groove, 13-a damping hole, 14-a blind hole, 15-a processing hole, 16-an air inlet hole, 17-a valve cavity and 18-an air floating valve shoulder.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 2, a pneumatic servo valve with an air-float type sliding pair, in which an air float is arranged as a sliding pair, wherein: the air-floating type sliding pair comprises a valve core 5 and a valve sleeve 6, wherein the valve core 5 is arranged in the valve sleeve 6, air-floating type valve shoulders 18 are arranged at two ends of the valve core 5 and are arranged in the valve sleeve 6 and are in clearance fit with the valve sleeve, the air-floating type valve shoulders 18 are cylindrical, a blind hole 14 communicated with a central hole of the valve core is arranged in the middle of the valve shoulders, a plurality of grooves 12 communicated with the blind hole 14 are arranged on the air-floating type valve shoulders along the circumferential direction, each groove 12 and the inner wall of the valve sleeve 6 form a static pressure bearing cavity, when air is introduced into the central hole of the valve core, the air enters the static pressure bearing cavity through the blind hole, an air film is formed between the air-floating type valve shoulders and the inner wall of the valve sleeve, the pressure of the air in the static pressure bearing cavity acts on the valve core, and the valve core is suspended in the valve sleeve through the cooperation of the, so as to reduce the friction between the valve core and the inner wall of the valve sleeve when the valve core moves transversely.
As shown in fig. 3 and 4, the air-float valve shoulder has a plurality of grooves 12, the number of the grooves is even, when gas is discharged from the grooves to ensure the balance of the valve core in all directions, the grooves and the inner wall of the valve housing form a static pressure supporting cavity, the damping hole 13 is connected with the air inlet channel 14 inside the valve core, the air inlet hole 16 is processed in the middle of the valve core, the blind hole 14 is connected with the valve cavity 17 of the pneumatic servo valve, the gas passes through the air inlet hole 16 in the middle of the valve core and the air inlet channel 14 from the valve cavity 17, and then enters the grooves from the damping hole 13, namely enters the static pressure supporting cavity, the air film supporting valve core 5 is formed in the tiny gap between the valve core 5 and the valve housing 6, the friction pair working surface of the valve core 5 and the valve housing 6 is separated, the abrasion generated by the valve core 5 and the valve housing 6.
The number of the grooves 12 in the air-floating valve shoulder is 4, and the included angle formed by the connection line of the end point of the width direction and the center of the valve core ranges from 20 degrees to 90 degrees, as shown in fig. 5, in one embodiment of the present embodiment, the included angle is 45 degrees.
As shown in fig. 2, a machining hole 15 is arranged between each damping hole 13 and the groove 12 of the air-float valve shoulder for assisting in machining the damping hole 13.
As shown in FIG. 2, the valve core 5 has two symmetrical air inlet holes 16 in the middle, which are communicated with the valve core internal channel 14 to provide air for the static pressure supporting structure.
In addition, the static pressure supporting cavity of the invention is also arranged on the inner wall of the valve sleeve, and is not limited to the invention arranged on the valve shoulder.
As shown in fig. 6, in one embodiment of the present invention, the pneumatic servo valve includes a driving unit 10, a three-position five-way spool valve, and a displacement detecting unit, the driving unit is disposed at one end of the three-position five-way spool valve, the displacement detecting unit is disposed at the other end of the three-position five-way spool valve, and the driving unit is positioned with the spool 5 through a sleeve 9.
The three-position five-way pneumatic slide valve comprises a valve body 8, a valve sleeve 6 and a valve core 5, wherein the valve sleeve 6 and the valve core 5 form a sliding pair, two ends of the valve core 5 are provided with cross static pressure air floating valve shoulders, the valve body 8 and the valve sleeve 6 form five annular valve cavities, and radial air static sealing is realized between the annular valve cavities by O-shaped sealing rings 7;
the displacement detection unit comprises a displacement sensor 1, a fastening nut 2, a displacement sensor mounting seat 3 and a displacement sensor positioning plate 4, wherein an internal thread is processed in a center hole at the right end of the valve body 8 and is connected with the displacement sensor mounting seat 3 processed with an external thread through a thread, and the displacement sensor 1 is fixed in the center through hole of the displacement sensor mounting seat 3 through the fastening nut 2; the right end of the valve core 5 is provided with an external thread which is in threaded connection with the displacement sensor positioning plate 4, and the displacement sensor positioning plate 4 is close to the eddy current displacement sensor but is not in contact with the eddy current displacement sensor.
The controller 11 is electrically connected with the driving unit 10 and the displacement sensor 1 through leads respectively, the displacement sensor 1 sends the detected valve core displacement to the controller 11, and the controller 11 amplifies a difference signal comparing the valve core displacement with a displacement instruction signal and sends the difference signal to the driving unit 10 to form closed-loop control of the valve core position.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a pneumatic servo valve with air supporting formula sliding pair which characterized in that is provided with air supporting formula sliding pair in this pneumatic servo valve, wherein:
the air-floating type sliding pair comprises a valve core (5) and a valve sleeve (6), wherein the valve core (5) is arranged in the valve sleeve (6), air-floating type valve shoulders (18) are arranged at two ends of the valve core (5) and are arranged in the valve sleeve (6) and are in clearance fit with the valve sleeve, the air-floating type valve shoulders (18) are cylindrical, a blind hole (14) communicated with a central hole of the valve core is arranged in the middle of the valve shoulders, a plurality of grooves (12) communicated with the blind hole (14) are arranged on the air-floating type valve shoulders along the circumferential direction, each groove (12) and the inner wall of the valve sleeve (6) form a static pressure bearing cavity, when air is introduced into the central hole of the valve core, the air enters the static pressure bearing cavity through the blind hole, an air film is formed between the air-floating type valve shoulders and the inner wall of the valve sleeve, and the pressure of the air in the static pressure bearing cavity acts on, the cooperation of the plurality of hydrostatic bearing chambers allows the valve spool to float within the valve housing, thereby reducing friction with the interior walls of the valve housing during lateral movement of the valve spool.
2. A pneumatic servo valve with an air-floating sliding pair according to claim 1, wherein a damping hole (13) and a machining hole (15) are provided between the groove (12) and the blind hole (14), through which communication between the groove and the blind hole is achieved, the damping hole is used for securing the pressure of the hydrostatic bearing chamber, and the machining hole is used for connecting the damping hole and the groove, and simultaneously, machining of the damping hole is facilitated.
3. Pneumatic servo valve with air-floating sliding pairs according to claim 1, characterised in that the number of grooves (12) is even, so that the balance of the valve spool in all directions is ensured when the gas is discharged from the grooves.
4. The pneumatic servo valve with the air-floating type sliding pair as claimed in claim 1, wherein the number of the grooves (12) is 4, and the included angle formed by the end point of the groove in the width direction and the connecting line of the center of the valve core is in the range of 20-90 °.
5. The pneumatic servo valve with an air-floating slide pair as claimed in claim 1, wherein the pneumatic servo valve is a three-position five-way valve or a three-position three-way valve.
6. The pneumatic servo valve with the air-floating type sliding pair as claimed in claim 1, wherein the pneumatic servo valve further comprises a driving unit and a displacement detection unit, the driving unit is connected to one end of the valve core and is used for driving the valve core to move transversely in the valve sleeve, and the displacement detection unit is used for detecting the displacement of the valve core in the transverse direction in real time.
7. The pneumatic servo valve with the air-floating type sliding pair as claimed in claim 6, wherein the driving unit and the displacement detection unit are respectively connected with a controller (11), the displacement detection unit transmits the detection result to the controller, and the controller regulates and controls the driving unit to drive the valve core to move.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911354415.8A CN111059322B (en) | 2019-12-25 | 2019-12-25 | Pneumatic servo valve with air-floating sliding pair |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911354415.8A CN111059322B (en) | 2019-12-25 | 2019-12-25 | Pneumatic servo valve with air-floating sliding pair |
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| CN111059322A CN111059322A (en) | 2020-04-24 |
| CN111059322B true CN111059322B (en) | 2020-11-17 |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2279994A1 (en) * | 1974-05-03 | 1976-02-20 | Jacottet Paul Ets | NEW HYDROSTATIC SEALING DEVICE |
| DE112005002523A5 (en) * | 2004-11-09 | 2007-07-12 | Luk Lamellen Und Kupplungsbau Beteiligungs Kg | Valve |
| CN1312421C (en) * | 2005-01-18 | 2007-04-25 | 哈尔滨工业大学 | Non-contacting gas commutating valve with aperture stepless regulation |
| CN201306502Y (en) * | 2008-10-17 | 2009-09-09 | 北京工业大学 | Double-phase opposite giant magnetostrictive self-sensing-driven direct force feedback servo valve |
| CN201513406U (en) * | 2009-09-25 | 2010-06-23 | 浙江工业大学 | High-frequency high-flow 2D digital servo valve |
| CN102128205A (en) * | 2010-12-24 | 2011-07-20 | 东莞市尚正机电科技有限公司 | Hydraulic support suspension system for mechanical movement of cylinder with high bearing capacity |
| CN103939467B (en) * | 2014-05-04 | 2017-04-12 | 中国电子科技集团公司第十六研究所 | Air hydrostatic bearing of machine making free piston type reciprocating motion |
| CN206439301U (en) * | 2016-12-16 | 2017-08-25 | 大连海事大学 | A kind of pressurized air slit thrust bearing |
| CN108533559B (en) * | 2018-05-24 | 2019-09-27 | 同济大学 | A kind of rebound jetting type deflector electrohydraulic servo valve with hydrostatic support |
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