CN103398813A - Porous nozzle floating plate mechanism used for measuring force - Google Patents
Porous nozzle floating plate mechanism used for measuring force Download PDFInfo
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- CN103398813A CN103398813A CN2013103155692A CN201310315569A CN103398813A CN 103398813 A CN103398813 A CN 103398813A CN 2013103155692 A CN2013103155692 A CN 2013103155692A CN 201310315569 A CN201310315569 A CN 201310315569A CN 103398813 A CN103398813 A CN 103398813A
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Abstract
The invention relates to a porous nozzle floating plate mechanism used for measuring force. The top of the nozzle body of the mechanism is provided with a cylindrical nozzle head in an interference fit mode; the axial center of the nozzle head is provided with a through pressure hole; the pressure hole on the bottom of the nozzle head is provided with a pipe joint; the pipe joint is communicated with one end of a piezometric pipe; the other end of the piezometric pipe is positioned outside the nozzle body; the middle in the nozzle body is provided with a throttling laminate for forming a stable cavity and an air inlet cavity; the bottom of the nozzle body is communicated with an air inlet nozzle; the inner cavity of the nozzle body is the air inlet cavity; the top surface of the nozzle head is provided with a cylindrical floating plate; the nozzle head is made of porous material; two axial end surfaces of the nozzle head are kept at the ventilation state; the side surface of the outer cylinder is an air-proof sealing surface so as to ensure that air only can flow through along the axial direction vertical to the upper end surface and the lower end surface of the nozzle head. Compared with the traditional single-hole air supply nozzle floating plate mechanism, the porous nozzle floating plate mechanism used for measuring the force, which is disclosed by the invention, has the advantages of good working stability, wide measuring range and high measurement precision.
Description
Technical field
The invention belongs to a kind of force sensor technologies field, is a kind of nozzle of Porous for ergometry kickboard mechanism specifically.
Background technology
Chinese patent ZL200810019550.2 has proposed a kind of nozzle kickboard mechanism with single-hole nozzle structure.Nozzle kickboard mechanism is not subjected to the interference with kickboard surface parallel direction acting force along perpendicular to the lip-deep component of kickboard big or small the time for measuring the power on the kickboard surface of acting on, but in use, said nozzle kickboard mechanism stable working range is little, range is little and Surveying Actual Precision unsatisfactory be the problem of bad solution always.Through theoretical and experimental study, find, between nozzle and kickboard in the air film flow field gas flow rate and pressure distribution inequality be to cause nozzle kickboard mechanism's unstability and the unsatisfactory main reason of measuring accuracy, in addition, on nozzle, the pressure surge of venthole porch also affects the accuracy of measurement result.In having the nozzle kickboard mechanism of single-hole nozzle structure, gas enters atmosphere again after the aperture on nozzle is flowed through between nozzle and kickboard, an aperture is externally jet owing on nozzle, only having, speed and the pressure distribution in the air film flow field between nozzle and kickboard are very inhomogeneous, gas flow rate is very high near jet aperture, be easy to occur turbulent flow, thereby make nozzle kickboard mechanism lose stable and can't work, this has limited the efficient working range (range) of nozzle kickboard mechanism greatly; Simultaneously, the pressure distribution between nozzle and kickboard is also inhomogeneous, has affected the accuracy of nozzle kickboard mechanism dynamometry; In addition, in nozzle kickboard mechanism, on nozzle, aperture porch gaseous tension is considered as constant in theory, equal supply gas pressure, but in fact in the whole range ability of nozzle kickboard mechanism, corresponding to the acting force of different sizes on kickboard, the flow of the nozzle kickboard of flowing through mechanism is different, this pressure that can cause aperture porch on nozzle changes to some extent, and aperture porch stream condition is stable not on nozzle, and these factors also cause negative effect to the measuring accuracy of nozzle kickboard mechanism.
Summary of the invention
In order to solve the little and not high defect of measuring accuracy of poor stability, range that single-hole nozzle kickboard mechanism exists, make in the air film flow field between nozzle and kickboard and have uniform velocity distribution and pressure distribution, reduce the fluctuation of nozzle entrance place gas velocity and pressure and to the negative effect that measuring accuracy produces, the invention provides a kind of nozzle of Porous for ergometry kickboard mechanism.
Concrete improvement technical scheme is as follows:
A kind of nozzle of Porous for ergometry kickboard mechanism comprises nozzle body cylindraceous, the top interference fit of nozzle body is provided with columniform head of nozzle, the axial centre of head of nozzle is provided with the pressure tap of perforation, the pressure tap place of head of nozzle bottom is provided with the first pipe adapter, the first pipe adapter is being communicated with an end of piezometric tube, and the other end of piezometric tube is positioned at the nozzle body outside; Middle part in nozzle body has been disposed radially the throttling laminate, and the restrictor layer plate material is the Porous bronze, and the top of throttling laminate is stable cavity, and the below of throttling laminate is inlet chamber, and the nozzle body sidewall of stable cavity is provided with and is communicated with the second outside pipe adapter; The bottom of nozzle body is being communicated with nozzle of air supply, the nozzle body top corresponding with the head of nozzle end face is provided with columniform kickboard, the diameter of kickboard is greater than the diameter of head of nozzle, improvement is: the material of described head of nozzle is porous material, the axial both ends of the surface of head of nozzle keep aeration status, the outside cylinder side is airproof sealing surface, thereby guarantees that gas can only be from the axial flow mistake perpendicular to the head of nozzle upper and lower end face.
Described porous material is factor of porosity greater than 15% powdered metallurgical material, is specially Porous bronze or porous ceramic or Porous Graphite.
Head of nozzle material of the present invention has adopted porous material, and porous material refers generally to factor of porosity greater than 15% powdered metallurgical material, such as Porous bronze, porous ceramic, Porous Graphite etc.Adopt porous material to make nozzle, on whole nozzle face, be evenly distributed with various fine air vents, can thoroughly change the single-point blowing model of cellular type spray nozzle of the gas supply, the gas of Porous nozzle of flowing through has almost unanimously become axia flow, the flow field internal pressure is consistent almost everywhere, and the gas flow rates peak value is obviously less.In the air film flow field, gas velocity is low means that the interval of nozzle kickboard mechanism stable work is large, and between Porous nozzle and the balanced external force that means on pressure tap and kickboard of gas flowfield pressure distribution between kickboard, funtcional relationship is stablized.Secondly, the present invention, by the porous restriction layer is set, had formed a stream pressure and the metastable zone of speed before gas flows to head of nozzle, make gas less in the pressure surge of head of nozzle place, was conducive to improve nozzle kickboard mechanism measuring accuracy.The 3rd, the present invention has set up gas and has flow to head of nozzle pressure survey link before, in order to eliminate the error that produces because of the change of head of nozzle porch gaseous tension in nozzle kickboard mechanism.
Therefore, the present invention can eliminate the defects such as single hole spray nozzle of the gas supply kickboard mechanism stable is poor, and surmounts single hole spray nozzle of the gas supply in the past-kickboard mechanism at aspect of performances such as range, measuring accuracy.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Sequence number in upper figure: kickboard 1, head of nozzle 2, pressure tap 3, the first pipe adapter 4, nozzle body 5, nozzle of air supply 6, inlet chamber 7, piezometric tube 8, gas suspension ring 9, air supporting air admission hole 10, flexible pipe 11, pressure instrumentation 12, stable cavity 13, throttling laminate 14, sleeve 15, the second pipe adapter 16.
Embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.
Embodiment 1
Referring to Fig. 1, a kind of nozzle of Porous for ergometry kickboard mechanism comprises nozzle body 5 cylindraceous, the top interference fit of nozzle body 5 is equipped with columniform head of nozzle 2, head of nozzle 2 materials are the Porous bronze, the factor of porosity of Porous bronze is greater than 15%, the axial both ends of the surface of head of nozzle 2 keep aeration status, and the outside cylinder side adopts plating mode to form airproof sealing surface, thereby guarantee that gas can only be from the axial flow mistake perpendicular to head of nozzle 2 upper and lower end faces; The air inlet face of head of nozzle 2 (following) adopts cut or does not process to keep the original air transmission coefficient of material, the face of giving vent to anger (top) of head of nozzle 2 adopts accurate grinding to process to improve its surface planarity precision and reduces its surface roughness value, and the face of giving vent to anger of head of nozzle 2 through after accurate grinding processing because blockage effect can form one deck tight zone as thin as a wafer that air transmission coefficient is lower, just as the extremely close aperture of porous layer surface uniform distribution one deck; When gas passes through head of nozzle 2 upper surface thin layer, just like by countless orifice restriction devices arranged side by side, obey in theory the aperture flowing law, gas is at the mobile Darcy law of deferring to of the other parts of porous layer.The axial centre of head of nozzle 2 is provided with the pressure tap 3 of perforation, pressure tap 3 places of head of nozzle 2 bottoms are equipped with the first pipe adapter 4, the first pipe adapter 4 is being communicated with an end of piezometric tube 8, the other end of piezometric tube 8 is positioned at nozzle body 5 outsides, and link by flexible pipe 11 and pressure instrumentation 12, in order to pressure instrumentation 12, directly measure the gaseous tension that is positioned at pressure tap 3 exits between nozzle and kickboard 1.The middle part of nozzle body 5 is supported throttling laminate 14 is set by sleeve 15, and the material of throttling laminate 14 adopts the Porous bronze, and its upper and lower surface is not processed the air transmission coefficient that keeps consistent with integral material.the cavity of throttling laminate 14 tops is stable cavity 13, and the cavity of throttling laminate 14 belows is inlet chamber 7, on nozzle body 5 sidewalls of stable cavity 13, is equipped with and is communicated with the second outside pipe adapter 16, the bottom of nozzle body 5 is being communicated with nozzle of air supply 6, has the air-flow of constant pressure after nozzle of air supply 6 flows to air cavity 7, can in inlet chamber 7, form complicated three-dimensional flow, along with varying in size of the directed force F on kickboard 1, the gas flow that flows through nozzle kickboard mechanism is also different, thereby the flowing gas state in inlet chamber 7 and pressure and the velocity distribution state variation larger, but the gas in inlet chamber 7 is after throttling laminate 14 flows to stable cavity 13, throttling action due to throttling laminate 14, make gaseous tension and velocity distribution in stable cavity 13 more even more stable.The second pipe adapter 16 is installed with stable cavity 13, is communicated with on the sidewall of nozzle body 5, flexible pipe 17 is connected the second pipe adapter 16 with pressure instrumentation 12, thereby pressure instrumentation 12 can be measured the pressure in stable cavity 13 in real time.Nozzle body 5 tops corresponding with head of nozzle 2 end faces are provided with columniform kickboard 1, and the diameter of kickboard 1 is greater than the diameter of head of nozzle 2.Circular gas suspension ring 9 is enclosed within the outside of kickboard 1, and guarantee that tolerance clearance is 0.02-0.04mm between the two, on the sidewall of gas suspension ring 9, be evenly equipped with 4 air supporting air admission holes 10, during by 4 air supporting air admission holes 10 of the gas of certain pressure access, can in the gap between kickboard 1 and gas suspension ring 9, produce the air film with certain load-bearing capacity; After installation, head of nozzle 2, kickboard 1 and gas suspension ring 9 are in coaxial state.
during work, gas with constant pressure enters inlet chamber 7 from nozzle of air supply 6, through throttling laminate 14, enter stable cavity 13, again by behind the gap between head of nozzle 2 flow nozzle heads 2 and kickboard 1, entering atmosphere, in this flow process, gas forms the carrying air film kickboard 1 is floated between nozzle and kickboard 1, make kickboard 1 be in complete suspended state, when on kickboard 1, directed force F being arranged, by pressure instrumentation 12, measure respectively the gas pressure value at pressure tap 3 places between nozzle and kickboard 1 and the gaseous tension in stable cavity 13, calculate directed force F along the axial component size of kickboard 1.In the course of work, 9 pairs of kickboards 1 of gas suspension ring radially played the noncontact supporting role, and kickboard 1 can be done vertically without frictional movement, therefore, the directed force F that acts on kickboard 1 is transmitted on the air film between nozzle and kickboard 1 fully and causes that gas film pressure raises along the axial component of kickboard, and the buoyancy institute balance that directed force F is produced by the air film between gas suspension ring 9 and kickboard along kickboard component radially, on the gas film pressure between head of nozzle 2 and kickboard 1 without impact.After the head of nozzle 2 that gas is made by the Porous bronze enters nozzle and kickboard 1 gap, pressure of formation and flowing velocity in nozzle and kickboard 1 are approximate equally distributed air film flow field, not only be conducive to the stable operation range of enlarged nozzle kickboard mechanism, and be conducive to improve the measuring accuracy of nozzle kickboard mechanism.Arranging of throttling laminate 14 formed a pressure and the comparatively stable stable cavity 13 of speed, and this makes at the gaseous tension of the air flow inlet end face of head of nozzle 2 stable, and the pressure while being convenient to accurately measure gas and flow to head of nozzle 2 by pressure instrumentation 12.
Described head of nozzle 2 materials are porous ceramic, and the factor of porosity of porous ceramic is greater than 15%.
The other the same as in Example 1.
Claims (2)
1. the nozzle of the Porous for ergometry kickboard mechanism, comprise nozzle body cylindraceous, the top interference fit of nozzle body is provided with columniform head of nozzle, the axial centre of head of nozzle is provided with the pressure tap of perforation, the pressure tap place of head of nozzle bottom is provided with the first pipe adapter, the first pipe adapter is being communicated with an end of piezometric tube, and the other end of piezometric tube is positioned at the nozzle body outside; Middle part in nozzle body has been disposed radially the throttling laminate, and the restrictor layer plate material is the Porous bronze, and the top of throttling laminate is stable cavity, and the below of throttling laminate is inlet chamber, and the nozzle body sidewall of stable cavity is provided with and is communicated with the second outside pipe adapter; The bottom of nozzle body is being communicated with nozzle of air supply, the nozzle body top corresponding with the head of nozzle end face is provided with columniform kickboard, the diameter of kickboard is greater than the diameter of head of nozzle, it is characterized in that: the material of described head of nozzle is porous material, the axial both ends of the surface of head of nozzle keep aeration status, the outside cylinder side is airproof sealing surface, thereby guarantees that gas can only be from the axial flow mistake perpendicular to the head of nozzle upper and lower end face.
2. a kind of nozzle of Porous for ergometry kickboard according to claim 1 mechanism is characterized in that: described porous material is factor of porosity greater than 15% powdered metallurgical material, is specially Porous bronze or porous ceramic or Porous Graphite.
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| CN201310315569.2A CN103398813B (en) | 2013-07-25 | 2013-07-25 | Porous nozzle floating plate mechanism used for measuring force |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785387A (en) * | 2015-04-24 | 2015-07-22 | 合肥工业大学 | Porous structure nozzle |
| CN105092142A (en) * | 2015-05-15 | 2015-11-25 | 合肥工业大学 | Apparatus for measuring unparallel nozzle and floating plate mechanisms |
| CN105195342A (en) * | 2015-04-24 | 2015-12-30 | 合肥工业大学 | Porous material nozzle with adjustable air permeability |
| CN106556481A (en) * | 2016-11-11 | 2017-04-05 | 合肥工业大学 | Floating nozzle device |
| CN106644182A (en) * | 2016-11-11 | 2017-05-10 | 合肥工业大学 | Float dynamometric device provided with negative pressure groove |
| CN106678179A (en) * | 2017-01-23 | 2017-05-17 | 武汉科技大学 | Cylindrically symmetric internal circumferential jet flow pressure stabilizing chamber supplying gas to high-pressure disc gas bearing |
| CN112729664A (en) * | 2020-12-07 | 2021-04-30 | 清华大学 | Method for determining the internal pressure of a fluid in a porous soft medium |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104785387A (en) * | 2015-04-24 | 2015-07-22 | 合肥工业大学 | Porous structure nozzle |
| CN105195342A (en) * | 2015-04-24 | 2015-12-30 | 合肥工业大学 | Porous material nozzle with adjustable air permeability |
| CN105092142A (en) * | 2015-05-15 | 2015-11-25 | 合肥工业大学 | Apparatus for measuring unparallel nozzle and floating plate mechanisms |
| CN105092142B (en) * | 2015-05-15 | 2018-05-11 | 合肥工业大学 | For measuring the device of not parallel nozzle kickboard mechanism |
| CN106556481A (en) * | 2016-11-11 | 2017-04-05 | 合肥工业大学 | Floating nozzle device |
| CN106644182A (en) * | 2016-11-11 | 2017-05-10 | 合肥工业大学 | Float dynamometric device provided with negative pressure groove |
| CN106644182B (en) * | 2016-11-11 | 2018-11-23 | 合肥工业大学 | Air flotation force measuring device with negative pressure trough |
| CN106556481B (en) * | 2016-11-11 | 2019-01-11 | 合肥工业大学 | floating nozzle device |
| CN106678179A (en) * | 2017-01-23 | 2017-05-17 | 武汉科技大学 | Cylindrically symmetric internal circumferential jet flow pressure stabilizing chamber supplying gas to high-pressure disc gas bearing |
| CN106678179B (en) * | 2017-01-23 | 2018-10-09 | 武汉科技大学 | A kind of jet stream pressure stabilizing cavity circumferential into the column symmetry of high pressure disk gas bearing gas supply |
| CN112729664A (en) * | 2020-12-07 | 2021-04-30 | 清华大学 | Method for determining the internal pressure of a fluid in a porous soft medium |
| CN112729664B (en) * | 2020-12-07 | 2021-11-05 | 清华大学 | Method for determining the internal pressure of a fluid in a porous soft medium |
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Effective date of registration: 20210407 Address after: 245000 No.50, Meilin Avenue, Huangshan Economic Development Zone, Huangshan City, Anhui Province Patentee after: Huangshan Development Investment Group Co.,Ltd. Address before: Tunxi road in Baohe District of Hefei city of Anhui Province, No. 193 230009 Patentee before: Hefei University of Technology |