CN101603878A - The high-sensitivity eddy momentum meter that is used for gasmetry - Google Patents
The high-sensitivity eddy momentum meter that is used for gasmetry Download PDFInfo
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- CN101603878A CN101603878A CNA2009100697378A CN200910069737A CN101603878A CN 101603878 A CN101603878 A CN 101603878A CN A2009100697378 A CNA2009100697378 A CN A2009100697378A CN 200910069737 A CN200910069737 A CN 200910069737A CN 101603878 A CN101603878 A CN 101603878A
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Abstract
The invention discloses a kind of high-sensitivity eddy momentum meter that is used for gasmetry.Concrete structure is that honeycomb ceramics, outer cover and moment of torsion transmitter shaft are connected to an integral body and place in the momentum meter housing, and the housing upper end is fluted, is silicone oil in the groove.The float ring places silicone oil.Positioning disk and momentum meter housing are fastening, and the upper and lower side of positioning disk is equipped with bearing respectively.Demarcating connecting rod is sleeved on the moment of torsion transmitter shaft of positioning disk lower end.Connecting rod one end and moment of torsion transmitter shaft are fastening, and the other end passes momentum meter housing and is connected to two counterweights.Torque sensor is connected in " right-angled intersection axle " mode with the moment of torsion transmitter shaft, and the torque sensor shaft collar is fixed on momentum meter housing lower end.The moment of torsion transmitter shaft rotates and makes sensor produce signal, is used for simulating air-flow and enters the moment of torsion that honeycomb ceramics produces.Change counterweight and can obtain different moments of torsion.The present invention is by settings such as counteract gravity forces, moment of torsion transmission and static demarcatings, and the detection of engine cylinder head system upper airway flow dynamic characteristic is had higher sensitivity and accuracy.
Description
Technical field
The invention belongs to air passage of internal combustion engine Performance Detection technology, when being specifically related to the test of air flue current stabilization, be used to weigh a kind of high-sensitivity eddy momentum meter of engine cylinder head system upper airway flow dynamic characteristic.
Background technology
Engine is in order to obtain good dynamic property, economy and emission performance, require the cylinder head of engine sufficiently high coefficient of flow and suitable swirl ratio must be arranged, roll parameters such as stream compares, so air flue test stand always is exactly the important tool that engine development and engine quality detect.The internal combustion engine gas path flow performance permanent flow test platform comprises worktable, airflow line, the complicated flowing test system of one cover such as orifice flowmeter, eddy current momentum meter, during the test of air passage of internal combustion engine current stabilization, require simulated engine cylinder head valve to open valve continuously or intermittently, at each reference mark, tight test valve opening amount at this moment, gas flow, the pressure reduction at air flue two ends, gas moment of torsion etc. and relevant parameters such as upper airway flow coefficient of discharge, swirl ratio.Wherein the main device of test gas flow, gas torque is flowmeter and eddy current momentum meter.Under each test reference mark, the size of flowmeter survey gas flow, eddy current momentum instrumentation amount torque, these two data have directly determined flow property parameters such as coefficient of flow, the swirl ratio etc. of air flue.
As mentioned above, eddy current momentum meter is one of chief component of air flue test stand, if the accuracy of test result is relatively poor, can directly cause adverse influence to air passage of internal combustion engine exploitation, and currently be used for the momentum meter that the flow measurement of internal combustion (IC) engine cylinder homeostasis is used, generally the small moment of torsion that the air-flow under the especially low valve stroke of air-flow is produced reflects insensitive, measuring accuracy is not high, the reason that causes this result is many-sided, but main cause is a friction force that the imbalance of the gravity of moment of torsion transmission system and moment of torsion transmission system itself causes have been caused gas energy to be delivered in the process of torque sensor energy loss having occurred, and caused reacting in the moment of torsion transmittance process insensitive, although the absolute value of gas energy loss is very little, but the torque value with respect to the especially low valve stroke downstream of gas produces influences still very big.Therefore, high sensitivity momentum meter utilizes buoyancy, has both offset gravity by simple mechanism, is convenient to realize static equilibrium again, thereby part has reduced the gas energy loss, thereby makes the momentum meter have high sensitivity and have more high precision.
Summary of the invention
The object of the present invention is to provide a kind of eddy current momentum meter that is used to weigh engine cylinder head system upper airway flow dynamic characteristic, make it have high sensitivity and high precision.
Below in conjunction with accompanying drawing technical pattern of the present invention and principle are illustrated.High-sensitivity eddy momentum meter mainly is divided into: counteract gravity forces device, torque transmitter and three parts of static demarcating device.The counteract gravity forces device mainly comprises: air-bubble level, moment of torsion transmitter shaft, honeycomb ceramics, outer cover, corresponding fastening bolt, plastic float ring and, the groove on the momentum meter housing etc.; Torque transmitter mainly comprises: momentum meter housing, moment of torsion transmitter shaft, positioning disk, corresponding fastening bolt, bearing, torque sensor, torque sensor shaft collar etc.; The static demarcating device mainly comprises: demarcate connecting rod and pulley etc.
On momentum meter housing top is the counteract gravity forces device.Honeycomb ceramics, outer cover are connected to an integral body by fastening bolt and securing member and moment of torsion transmitter shaft respectively and place in the momentum meter housing, and there is a groove momentum meter housing upper end, and groove is equipped with silicone oil, and the plastic float ring is placed on the silicone oil.For the strength of vortex of measurement gas, the effect of honeycomb ceramics is that the eddy current that enters the momentum meter is converted to the power that rotates around the honeycomb ceramics axle center.When honeycomb ceramics etc. rotates, the gravity that the buoyancy that is produced on silicone oil by the plastic float ring is offset whole moment of torsion transmission system, because be provided with glass window in momentum meter housing upper end, check by view window whether the silicone oil amount is suitable, thereby regulate the size of silicone oil amount with control buoyancy, simultaneously for the axle center that guarantees gravity and moment of torsion transmitter shaft point-blank, the last end face of adjusting the momentum meter by air-bubble level is horizontal all the time.
In momentum meter housing middle part is the torque transfer part branch.Positioning disk is fastening with clamping screw and momentum meter housing, and the upper and lower end of positioning disk is equipped with bearing respectively.The effect of positioning disk is to be used for guaranteeing that the axle center of torque sensor and the axle center of moment of torsion transmitter shaft have good right alignment.Because positioning disk sleeve is contained on the moment of torsion transmitter shaft, thus require positioning disk system and the interior center of momentum meter housing to have very high right alignment, to guarantee the balance of whole moment of torsion transmission system.When air-flow process honeycomb ceramics, because the characteristic of air current flow and the column structure of honeycomb ceramics can produce a torque signal, this signal passes to torque sensor through moment of torsion transmitter shaft.
In momentum meter housing lower end is the static demarcating device.Demarcation connecting rod as radially moment of torsion transmission is sleeved on the moment of torsion transmitter shaft of positioning disk lower end.Demarcate connecting rod and adopted symmetrical structure, fastening with bolt and moment of torsion transmitter shaft, momentum meter housing is passed in the outer end.Torque sensor is fixed on the center of torque sensor shaft collar, and is coaxial with the momentum meter.The torque transfer member of moment of torsion transmitter shaft lower end is suspended in the torque sensor top in " right-angled intersection axle " mode, and torque sensor is fixed on momentum meter housing lower end with shaft collar.Demarcate the link end both sides and be provided with the pulley timing signal, the counterweight bolt is being demarcated the connecting rod outer end, the gravity of counterweight is converted to and demarcates the power of the perpendicular radial direction of connecting rod by the pulley of a side wherein.As counterweight being placed on the pulley of opposite side, can obtain reciprocal moment of torsion.
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present invention.
Fig. 2 disassembles synoptic diagram for torque transmitter.
Fig. 3 is the outside synoptic diagram of static demarcating device.
Fig. 4 is momentum meter output AD quantized value and momentum meter moment of torsion corresponding relation curve.
Embodiment
Below in conjunction with accompanying drawing and by embodiment theory structure of the present invention is described further.
The high-sensitivity eddy momentum meter that is used for gasmetry comprises: honeycomb ceramics, moment of torsion transmitter shaft, outer cover, fastening bolt, momentum meter, pulley etc.Honeycomb ceramics 1 is cylindrical, and honeycomb ceramics places in the outer cover 2, by fastening bolt 3 honeycomb ceramics and outer cover is fixed.Moment of torsion transmitter shaft 4 tops are provided with external thread, and honeycomb ceramics securing member 5 is provided with internal thread, and honeycomb ceramics 1 is concentric fastening with moment of torsion transmitter shaft 4 by center fastening bolt 6 and honeycomb ceramics securing member 5.Loosening on the moment of torsion transmitter shaft for preventing the honeycomb ceramics securing member, honeycomb ceramics securing member 5 is provided with set screw with moment of torsion transmitter shaft 4.Momentum meter housing 7 upper ends are provided with groove 8, and groove is equipped with silicone oil, and plastic float ring 9 places in the groove.Honeycomb ceramics 1 and outer cover 2 are assembled in the momentum meter housing 7.Moment of torsion transmitter shaft 4 is set with positioning disk 10, and positioning disk is fastening with positioning disk clamping screw 11 and momentum meter housing 7, and positioning disk 10 upper and lower sides are equipped with head bearing 12 and lower bearing 13 respectively.Demarcate connecting rod 14 and be set on the moment of torsion transmitter shaft 4 of positioning disk 10 lower ends, it is inner fastening with moment of torsion transmitter shaft 4 with demarcating bar bolt 15 to demarcate connecting rod; Demarcate the connecting rod external end head and pass momentum meter housing 7, demarcate both sides, connecting rod outer end and respectively be provided with a pulley 16, demarcation connecting rod external end head is walked around pulley 16 bolts by cord counterweight 23.Torque sensor 17 is fixed on the center of torque sensor shaft collar 19 by torque sensor bolt 18, and is coaxial with the momentum meter.The torque transfer member 20 of moment of torsion transmitter shaft 4 lower ends is suspended in torque sensor 17 tops in " right-angled intersection axle " mode, does not come in contact between under static state, and torque sensor shaft collar 19 usefulness shaft collar bolts 21 are fastened on momentum meter housing 7 lower ends.Momentum meter housing 7 outer ends are provided with glass window 22, and end face is inlaid with air-bubble level 24 on the momentum meter housing.
Honeycomb ceramics is the capable disc structure of post, earlier assemblings such as honeycomb ceramics, float ring, axle system is finished during assembling, on bearing bracket stand, it is freely rotated its horizontal support.Below the orientation that circumferencial direction is heavier must turn under action of gravity automatically.Show that it does not reach static equilibrium as yet.Can attach the way of counterweight in the framework periphery.Make it to reach static equilibrium.Remove counterweight and claim the actual weight of this counterweight, for example counterweight is 2g, and measuring it is 10mm apart from the distance in axle center, learns that then unbalanced moments is 20g.cm.Paint and mark, indicate position and statically balanced moment values 20g.cm.Take off the float ring,, remove corresponding weight, make it to reach static equilibrium in the paint antimere boring of mark of framework.
Concrete timing signal, the moment of torsion transmitter shaft rotates and contacts with torque sensor by torque transfer member, is used for simulating air-flow and enters the moment of torsion that honeycomb ceramics produces.The weight that changes counterweight 23 can obtain different respective value, counterweight is placed on the pulley of opposite side again, can obtain reciprocal moment of torsion.The weight that changes counterweight then detects again again, the moment of torsion all linear (as Fig. 4) that the numerical value of two groups of data and counterweight weight produce, these data are raw data, and the numerical value that obtains by the experimental evidence torque sensor just can obtain real torque value by differential technique from raw data.
The aperture of present embodiment demarcation connecting rod outer end is 100mm to the distance in moment of torsion transmitter shaft axle center, and 5g counterweight bolt is being demarcated the connecting rod outer end.Honeycomb ceramics drives the moment of torsion of a 5m N.m of moment of torsion transmitter shaft rotation generation, at this moment can obtain a value corresponding from torque sensor, the counterweight of 5g is changed to 10g, can obtain a value corresponding from torque sensor again, the weight that changes counterweight can obtain different numerical value.Then different counterweights is placed on the pulley of another side,, does again as stated above one time, can obtain another and organize reciprocal numerical value to simulate reciprocal moment of torsion.For example: air-flow flows into honeycomb ceramics and has obtained an AD quantized value 11000 by torque sensor, and the AD value representation is exported electric signal with torque sensor and is converted into digital signal, and actual torque value so at this moment is forward (overlook, clockwise) 28mN.m.
Characteristics of the present invention and useful effect are: high sensitivity momentum meter utilizes buoyancy, both supports by simple mechanism The gravity that disappeared is convenient to again realize static balance, thereby part has reduced the gas energy loss, thereby so that the momentum meter had High sensitivity also has more high precision.
Claims (2)
1. high-sensitivity eddy momentum meter that is used for gasmetry, comprise honeycomb ceramics, the moment of torsion transmitter shaft, outer cover, fastening bolt, the momentum meter, pulley, it is characterized in that honeycomb ceramics (1) is for cylindrical, honeycomb ceramics places in the outer cover (2), by fastening bolt (3) honeycomb ceramics and outer cover are fixed, moment of torsion transmitter shaft (4) top is provided with external thread, honeycomb ceramics securing member (5) is provided with internal thread, honeycomb ceramics (1) is concentric fastening with moment of torsion transmitter shaft (4) by center fastening bolt (6) and honeycomb ceramics securing member (5), (4) are provided with set screw between honeycomb ceramics securing member (5) and the moment of torsion transmitter shaft, momentum meter housing (7) upper end is provided with groove (8), groove is equipped with silicone oil, plastic float ring (9) places in the groove, honeycomb ceramics (1) and outer cover (2) are assembled in the momentum meter housing (7), moment of torsion transmitter shaft (4) is set with positioning disk (10), positioning disk is fastening with positioning disk clamping screw (11) and momentum meter (7) housing, positioning disk (10) upper and lower side is equipped with head bearing (12) and lower bearing (13) respectively, demarcating connecting rod (14) is set on the moment of torsion transmitter shaft (4) of positioning disk (10) lower end, it is fastening with moment of torsion transmitter shaft (4) with demarcating bar bolt (15) to demarcate the connecting rod inner termination, demarcate the connecting rod external end head and pass momentum meter housing (7), demarcate both sides, connecting rod outer end and respectively be provided with a pulley (16), demarcation connecting rod external end head is walked around pulley (16) bolt by cord counterweight (23), torque sensor (17) is fixed on the center of torque sensor shaft collar (19) by torque sensor bolt (18), coaxial with the momentum meter, the torque transfer member (20) of moment of torsion transmitter shaft (4) lower end is suspended in torque sensor (17) top in " right-angled intersection axle " mode, and torque sensor shaft collar (19) is fastened on momentum meter housing (7) lower end with shaft collar bolt (21).
2. according to claims 1 described a kind of high-sensitivity eddy momentum meter that is used for gasmetry, it is characterized in that described momentum meter housing (7) outer end is provided with glass window (22), momentum meter housing (7) is gone up end face and is inlaid with air-bubble level (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100697378A CN101603878B (en) | 2009-07-16 | 2009-07-16 | High-sensitivity eddy momentum meter for measuring gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100697378A CN101603878B (en) | 2009-07-16 | 2009-07-16 | High-sensitivity eddy momentum meter for measuring gas |
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| CN101603878A true CN101603878A (en) | 2009-12-16 |
| CN101603878B CN101603878B (en) | 2011-06-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748388A (en) * | 2012-06-30 | 2012-10-24 | 浙江工业大学 | Protective device for air bearing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2624202Y (en) * | 2003-04-30 | 2004-07-07 | 天津大学 | Swirl momentum meter |
| CN101408440A (en) * | 2008-11-26 | 2009-04-15 | 天津大学 | Convenient changing type hole-plate flowmeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748388A (en) * | 2012-06-30 | 2012-10-24 | 浙江工业大学 | Protective device for air bearing |
| CN102748388B (en) * | 2012-06-30 | 2015-05-27 | 浙江工业大学 | Protective device for air bearing |
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| CN101603878B (en) | 2011-06-15 |
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