CN109443460A - A kind of Venturi meter - Google Patents

A kind of Venturi meter Download PDF

Info

Publication number
CN109443460A
CN109443460A CN201811600228.9A CN201811600228A CN109443460A CN 109443460 A CN109443460 A CN 109443460A CN 201811600228 A CN201811600228 A CN 201811600228A CN 109443460 A CN109443460 A CN 109443460A
Authority
CN
China
Prior art keywords
aditus laryngis
pipeline section
pressure
section
main leg
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201811600228.9A
Other languages
Chinese (zh)
Inventor
杨豫魁
代子阳
姚旺
张广西
刘学哲
王新校
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
Original Assignee
Weichai Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN201811600228.9A priority Critical patent/CN109443460A/en
Publication of CN109443460A publication Critical patent/CN109443460A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40Details of construction of the flow constriction devices
    • G01F1/44Venturi tubes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a kind of Venturi meters, including main leg, aditus laryngis pipeline section and aditus laryngis pressure pipe, wherein inlet and outlet is provided on main leg, the tube wall of main leg is equipped with high pressure pressure tappings and low pressure pressure tappings;Aditus laryngis pipeline section connect with main leg's co-axial seal and can move relative to main leg along axial reciprocating;The first end of aditus laryngis pressure pipe is connected to low pressure pressure tappings, and second end extends to the mouth of shouting of aditus laryngis pipeline section, and the second end of aditus laryngis pressure pipe can be with the relative movement of aditus laryngis pipeline section and main leg by aditus laryngis pipeline section and main leg's on or off;It can be seen that, above-mentioned Venturi meter with EGR valve function, can throttling set quantity in reduction system, reduce restriction loss, be conducive to promote EGR rate and EGR flow, and valve block is not present, passage section is always ring section, and symmetry is high, flow perturbation is small, fluctuate it is small, make EGR flow it is more uniform, stablize, conducive to improve EGR exhaust flow measurement accuracy.

Description

A kind of Venturi meter
Technical field
The present invention relates to engine EGR technical field, in particular to a kind of Venturi meter.
Background technique
Current EGR engine egr system is in such a way that EGR valve and two part combination of Venturi meter use: EGR valve EGR exhaust flow is controlled, Venturi meter measures EGR exhaust flow.
EGR valve is applied in combination simultaneously with Venturi meter, so that throttling set increases in egr system, the section of egr system Stream loss increases, and is unfavorable for promoting EGR rate and EGR flow, and traditional EGR valve generally adjusts air-flow by valve block, air-flow passes through When valve block, vulnerable to the disturbance of valve block, the measurement of Venturi meter below is interfered, reduces its measurement accuracy.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of Venturi meter, to reduce throttle in egr system Part improves flow measurement precision.
To achieve the above object, the invention provides the following technical scheme:
A kind of Venturi meter, comprising:
Main leg, is provided with import and outlet, along the import to the outlet on the tube wall of the main leg Direction is successively arranged high pressure pressure tappings and low pressure pressure tappings;
Aditus laryngis pipeline section, the aditus laryngis pipeline section is connect with main leg's co-axial seal and the aditus laryngis pipeline section can be relative to institute Main leg is stated to move along axial reciprocating;
Aditus laryngis pressure pipe, the first end of the aditus laryngis pressure pipe are connected to the low pressure pressure tappings, and second end is to the larynx Mouth pipeline section shouts mouth extension, and the second end of the aditus laryngis pressure pipe can be opposite with the main leg's with the aditus laryngis pipeline section It moves the aditus laryngis pipeline section and main leg's on or off.
Preferably, the main leg includes import pipeline section and outlet pipe section, the both ends of the aditus laryngis pipeline section respectively with institute State import pipeline section and outlet pipe section connection, the high pressure pressure tappings, the low pressure pressure tappings and the aditus laryngis pressure Pipe is set in the import pipeline section.
Preferably, the end of the import pipeline section and the outlet pipe section towards the aditus laryngis pipeline section is respectively arranged with company Socket part, the both ends of the aditus laryngis pipeline section are respectively arranged with auxiliary section, the auxiliary section at the both ends of the aditus laryngis pipeline section respectively with it is described The interconnecting piece on interconnecting piece and the aditus laryngis pipeline section on import pipeline section is mating.
Preferably, the interconnecting piece is annular slot, and the auxiliary section is annular plug.
Preferably, the aditus laryngis pressure pipe is L-shaped, and the first end of the aditus laryngis pressure pipe and the low pressure pressure tappings are same Axis setting, second end and the aditus laryngis pipeline section are coaxially disposed.
Preferably, being connected smoothly between the contraction section of the aditus laryngis pipeline section, aditus laryngis and diffuser, it is hourglass-shaped to constitute Channel.
Preferably, the second end of the aditus laryngis pressure pipe is in water-drop-shaped structure, and the small end direction of the water-drop-shaped structure The aditus laryngis pipeline section.
Preferably, rounding off connects between each section outer surface on the aditus laryngis pressure pipe.
It preferably, further include differential pressure pickup, the high pressure test side of the differential pressure pickup is set to the high pressure pressure Mouthful, the low pressure test side of the differential pressure pickup is set to the low pressure pressure tappings.
Preferably, the minimum dimension of the second end of the aditus laryngis pressure pipe is less than the aditus laryngis size of the aditus laryngis pipeline section.
In conclusion Venturi meter provided by the invention includes main leg, aditus laryngis pipeline section and aditus laryngis pressure pipe, In, it is provided with import and outlet on main leg, is successively arranged high pressure pressure along import to export direction on the tube wall of main leg Mouth and low pressure pressure tappings;Aditus laryngis pipeline section is connect with main leg's co-axial seal and aditus laryngis pipeline section can be relative to main leg along axial past Multiple movement, low pressure pressure tappings and high pressure pressure tappings are respectively positioned on the upstream of aditus laryngis pipeline section;The first end and low pressure of aditus laryngis pressure pipe Pressure tappings connection, second end extends to the mouth of shouting of aditus laryngis pipeline section, and the second end of aditus laryngis pressure pipe can be with aditus laryngis pipeline section and master The relative movement of pipeline section by aditus laryngis pipeline section and main leg's on or off, i.e., the second end of aditus laryngis pressure pipe can by with aditus laryngis Flow channels between aditus laryngis pipeline section and main leg are truncated for the cooperation of pipeline section aditus laryngis, the second end and aditus laryngis point of aditus laryngis pressure pipe From when, with the increase of the second end and aditus laryngis distance of aditus laryngis pressure pipe, passage section between aditus laryngis pipeline section and main leg by It is cumulative big;When in use, one side user can utilize aditus laryngis pressure pipe by the relative position of adjusting aditus laryngis pipeline section and main leg Second end adjust the cross-sectional flow area between aditus laryngis pipeline section and main leg, realize the conducting of aditus laryngis pipeline section and main leg or cut Only, the above-mentioned Venturi meter is made to have the function of EGR valve;It is high that another aspect user can acquire entrance by high pressure pressure tappings Pressure, by the low pressure at the aditus laryngis pressure pipe that connect with low pressure pressure tappings acquisition aditus laryngis, user according to the pressure difference measured and this When aditus laryngis pressure pipe present position aditus laryngis pipeline section and main leg between practical cross-sectional flow area, pass through Bernoulli equation, energy Law of conservation and fluid flowing continuity equation etc., can calculate EGR exhaust flow when aditus laryngis pipeline section is in the position, To realize the survey calculation of EGR exhaust flow;It can be seen that above-mentioned Venturi meter is not necessarily to the function of EGR valve EGR valve is additionally set in egr system, can in reduction system throttling set quantity, reduce restriction loss, be conducive to be promoted EGR rate and EGR flow, and valve block is not present in above-mentioned Venturi meter, passage section is always ring section, and symmetry is high, Flow perturbation is small, and fluctuation is small, so that EGR exhaust air-flow is more uniform, stablizes, conducive to the measurement accuracy for improving EGR exhaust flow.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is structural schematic diagram when Venturi meter provided in an embodiment of the present invention is connected;
Fig. 2 is structural schematic diagram when Venturi meter provided in an embodiment of the present invention ends.
Wherein, 1 is main leg;101 be import pipeline section;102 be outlet pipe section;103 be annular slot;1a is high pressure pressure Mouthful;1b is low pressure pressure tappings;2 be aditus laryngis pipeline section;201 be annular plug;2a is aditus laryngis;3 be aditus laryngis pressure pipe;301 be water droplet Shape structure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
Fig. 1 and Fig. 2 are please referred to, Fig. 1 is structural schematic diagram when Venturi meter provided in an embodiment of the present invention is connected, Fig. 2 is structural schematic diagram when Venturi meter provided in an embodiment of the present invention ends.
The embodiment of the invention provides a kind of Venturi meters, including main leg 1, aditus laryngis pipeline section 2 and aditus laryngis pressure Pipe 3.
Wherein, be provided with import and outlet on main leg 1, on the tube wall of main leg 1 along import to export direction successively Equipped with high pressure pressure tappings 1a and low pressure pressure tappings 1b;Aditus laryngis pipeline section 2 is connect with 1 co-axial seal of main leg and aditus laryngis pipeline section 2 can It is moved relative to main leg 1 along axial reciprocating, low pressure pressure tappings 1b and high pressure pressure tappings 1a are respectively positioned on the upper of aditus laryngis pipeline section 2 Trip;The first end of aditus laryngis pressure pipe 3 is connected to low pressure pressure tappings 1b, and second end extends to the mouth of shouting of aditus laryngis pipeline section 2, and aditus laryngis takes Aditus laryngis pipeline section 2 and main leg 1 can be connected or be cut with the relative movement of aditus laryngis pipeline section 2 and main leg 1 by the second end of pressure pipe 3 Only.
In conclusion compared with prior art, Venturi meter provided in an embodiment of the present invention when in use, on the one hand User can utilize the second end of aditus laryngis pressure pipe 3 to adjust aditus laryngis pipe by the relative position of adjusting aditus laryngis pipeline section 2 and main leg 1 Cross-sectional flow area between section 2 and main leg 1 realizes the on or off of aditus laryngis pipeline section 2 and main leg 1, to make above-mentioned literary mound In flowmeter have the function of EGR valve;
Another aspect user can acquire inlet high pressure by high pressure pressure tappings 1a, pass through the larynx connecting with low pressure pressure tappings 1b Mouthful pressure pipe 3 acquires the low pressure at aditus laryngis 2a, and user is according to the pressure difference measured and 3 present position aditus laryngis of aditus laryngis pressure pipe at this time Practical cross-sectional flow area between pipeline section 2 and main leg 1 is flowed by Bernoulli equation, law of conservation of energy and fluid and is connected Continuous property equation etc., can calculate EGR exhaust flow when aditus laryngis pipeline section 2 is in the position, to realize EGR exhaust flow Survey calculation;
It can be seen that function of the above-mentioned Venturi meter with EGR valve, it is not necessary that EGR is additionally arranged in egr system Valve, can in reduction system throttling set quantity, reduce restriction loss, be conducive to promote EGR rate and EGR flow, and above-mentioned Valve block is not present in Venturi meter, and passage section is always ring section, and symmetry is high, and flow perturbation is small, and fluctuation is small, so that EGR exhaust air-flow is more uniform, stablizes, conducive to the measurement accuracy for improving EGR exhaust flow.
The movement of above-mentioned aditus laryngis pipeline section 2 can realize that the driving fills by the driving device being set to outside Venturi meter Setting can be Vidacare corp, such as motor, or piston cylinder.
Preferably, main leg 1 includes import pipeline section 101 and outlet pipe section 102, and import pipeline section 101 connects upstream Equipment, outlet pipe section 102 connect upstream device, and aditus laryngis pipeline section 2 is set between import pipeline section 101 and outlet pipe section 102, aditus laryngis The both ends of pipeline section 2 are connect with import pipeline section 101 and outlet pipe section 102 respectively, high pressure pressure tappings 1a, low pressure pressure tappings 1b and Aditus laryngis pressure pipe 3 is set in import pipeline section 101.
A variety of sides can be passed through between import pipeline section 101 and aditus laryngis pipeline section 2 and between outlet pipe section 102 and aditus laryngis pipeline section 2 Formula realizes movable seal connection, for example grafting, is spirally connected, as depicted in figs. 1 and 2, in embodiments of the present invention, import pipeline section 101 and the end of outlet pipe section 102 towards aditus laryngis pipeline section 2 be respectively arranged with interconnecting piece, the both ends of aditus laryngis pipeline section 2 are respectively set There is auxiliary section, the auxiliary section at the both ends of aditus laryngis pipeline section 2 is respectively and on the interconnecting piece and aditus laryngis pipeline section 2 on import pipeline section 101 Interconnecting piece is mating.Preferably, interconnecting piece is annular slot 103, and auxiliary section is annular plug 201.
In the above-described embodiments, to guarantee sealing, band need to be set between annular slot 103 and annular plug 201.
Above-mentioned technical proposal is advanced optimized, aditus laryngis pressure pipe 3 is L-shaped, and the first end of aditus laryngis pressure pipe 3 takes with low pressure Mouth 1b coaxial arrangement is pressed, second end and aditus laryngis pipeline section 2 are coaxially disposed.As depicted in figs. 1 and 2, aditus laryngis pressure pipe 3 includes along import The connection pipeline section and the center pipeline section axially extending along import pipeline section 101 that pipeline section 101 radially extends connect pipeline section far from center One end of pipeline section is coaxially connected in low pressure pressure tappings 1b, and center pipeline section and import pipeline section 101 are coaxial.Certainly, L shape aditus laryngis pressure pipe 3 be only preferred embodiment provided in an embodiment of the present invention, is actually not limited thereto, and using arc or can not also be advised Then shape etc., the cross-sectional profile of aditus laryngis pressure pipe 3 are also not limited to circle shown in figure, can be streamlined, to subtract Few resistance.
Preferably, as depicted in figs. 1 and 2, in embodiments of the present invention, the contraction section of aditus laryngis pipeline section 2, aditus laryngis 2a with And be connected smoothly between diffuser and constitute hourglass-shaped channel, aditus laryngis can be convenient for using this surface being connected smoothly Cutoff function is realized in the cooperation of pressure pipe 3 and aditus laryngis 2a.
It can cooperate for the second end convenient for aditus laryngis pressure pipe 3 with aditus laryngis 2a to cut aditus laryngis pipeline section 2 and import pipeline section 101 Only, the minimum dimension of the second end of aditus laryngis pressure pipe 3 is less than the aditus laryngis 2a size of aditus laryngis pipeline section 2, so that the of aditus laryngis pressure pipe 3 It is matched that two ends are inserted into aditus laryngis 2a.
To reduce resistance, as depicted in figs. 1 and 2, in embodiments of the present invention, the second end of aditus laryngis pressure pipe 3 is in water droplet Shape structure 301, and the small end of water-drop-shaped structure 301, towards aditus laryngis pipeline section 2, the second segment of aditus laryngis pressure pipe 3 uses water-drop-shaped knot On the one hand the tip of structure 301 can reduce gas-flow resistance, be on the other hand convenient for cooperating with the aditus laryngis 2a in above-described embodiment.
It preferably, can be by rounding off between each section outer surface on aditus laryngis pressure pipe 3 to reduce gas-flow resistance Connection.
Above-mentioned technical proposal is advanced optimized, differential pressure pickup can also be integrated on above-mentioned Venturi meter, is pressed The high pressure test side of gap sensor is set to high pressure pressure tappings 1a, and the low pressure test side of differential pressure pickup is set to low pressure pressure tappings The second end nozzle that 1b, i.e. the low pressure test side of differential pressure pickup stretch to aditus laryngis pressure pipe 3 from low pressure pressure tappings 1b.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one The widest scope of cause.

Claims (10)

1. a kind of Venturi meter characterized by comprising
Main leg, is provided with import and outlet, along the import to the export direction on the tube wall of the main leg It is successively arranged high pressure pressure tappings and low pressure pressure tappings;
Aditus laryngis pipeline section, the aditus laryngis pipeline section is connect with main leg's co-axial seal and the aditus laryngis pipeline section can be relative to the master Pipeline section is moved along axial reciprocating;
Aditus laryngis pressure pipe, the first end of the aditus laryngis pressure pipe are connected to the low pressure pressure tappings, and second end is to the aditus laryngis pipe Section shouts mouth extension, and the second end of the aditus laryngis pressure pipe can be with the relative movement of the aditus laryngis pipeline section and the main leg By the aditus laryngis pipeline section and main leg's on or off.
2. Venturi meter according to claim 1, which is characterized in that the main leg includes import pipeline section and goes out Mouth pipeline section, the both ends of the aditus laryngis pipeline section are connect with the import pipeline section and the outlet pipe section respectively, the high pressure pressure Mouth, the low pressure pressure tappings and the aditus laryngis pressure pipe are set in the import pipeline section.
3. Venturi meter according to claim 2, which is characterized in that the import pipeline section and the outlet pipe section It is respectively arranged with interconnecting piece towards the end of the aditus laryngis pipeline section, the both ends of the aditus laryngis pipeline section are respectively arranged with auxiliary section, institute State the auxiliary section at the both ends of aditus laryngis pipeline section respectively with the connection on the interconnecting piece and the aditus laryngis pipeline section on the import pipeline section Portion is mating.
4. Venturi meter according to claim 3, which is characterized in that the interconnecting piece is annular slot, described to match Conjunction portion is annular plug.
5. Venturi meter according to any one of claims 1-4, which is characterized in that the aditus laryngis pressure pipe is in L Shape, and the first end of the aditus laryngis pressure pipe and the low pressure pressure tappings are coaxially disposed, second end and the aditus laryngis pipeline section are coaxial Setting.
6. Venturi meter according to any one of claims 1-4, which is characterized in that the contraction of the aditus laryngis pipeline section It is connected smoothly between section, aditus laryngis and diffuser and constitutes hourglass-shaped channel.
7. Venturi meter according to claim 6, which is characterized in that the second end of the aditus laryngis pressure pipe is in water droplet Shape structure, and the small end of the water-drop-shaped structure is towards the aditus laryngis pipeline section.
8. Venturi meter according to claim 7, which is characterized in that each section appearance on the aditus laryngis pressure pipe Rounding off connects between face.
9. Venturi meter described in -4 and 7-8 any one according to claim 1, which is characterized in that further include that pressure difference passes Sensor, the high pressure test side of the differential pressure pickup are set to the high pressure pressure tappings, the low pressure detection of the differential pressure pickup End is set to the low pressure pressure tappings.
10. Venturi meter described in -4 and 7-8 any one according to claim 1, which is characterized in that the aditus laryngis pressure The minimum dimension of the second end of pipe is less than the aditus laryngis size of the aditus laryngis pipeline section.
CN201811600228.9A 2018-12-26 2018-12-26 A kind of Venturi meter Pending CN109443460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811600228.9A CN109443460A (en) 2018-12-26 2018-12-26 A kind of Venturi meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811600228.9A CN109443460A (en) 2018-12-26 2018-12-26 A kind of Venturi meter

Publications (1)

Publication Number Publication Date
CN109443460A true CN109443460A (en) 2019-03-08

Family

ID=65537586

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811600228.9A Pending CN109443460A (en) 2018-12-26 2018-12-26 A kind of Venturi meter

Country Status (1)

Country Link
CN (1) CN109443460A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114413979A (en) * 2022-03-30 2022-04-29 潍柴动力股份有限公司 Venturi tube flow measuring method

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764889A (en) * 1953-06-15 1957-01-02 Bopp & Reuther Gmbh An improved flow metering device
JPH0875621A (en) * 1994-08-31 1996-03-22 Tsukasa Sotsuken:Kk Constant flow rate sampling apparatus using variable cross section critical flow venturi tube using movable venturi tube
JPH08159933A (en) * 1994-11-30 1996-06-21 Tsukasa Sotsuken:Kk Exhaust-gas distributor using movable venturi tube
JPH09218062A (en) * 1996-02-13 1997-08-19 Tsukasa Sotsuken:Kk Variable sectional area venturi type flow meter
US20010013245A1 (en) * 1998-07-09 2001-08-16 Honda Giken Kogyo Kabushiki Kaisha Flow rate detector mechanism with variable venturi and exhaust gas sampling method using the same
US6510746B1 (en) * 1999-07-12 2003-01-28 Ford Global Technologies, Inc. Gas flow measurement
CN101333981A (en) * 2007-06-29 2008-12-31 卡特彼勒公司 Onboard method of determining egr flow rate
CN102944271A (en) * 2012-11-27 2013-02-27 银川融神威自动化仪表厂(有限公司) Composite internal and external venturi tube flowmeter
DE102014212854A1 (en) * 2014-07-02 2016-01-21 Robert Bosch Gmbh Flowmeter
CN209570223U (en) * 2018-12-26 2019-11-01 潍柴动力股份有限公司 A kind of Venturi meter

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764889A (en) * 1953-06-15 1957-01-02 Bopp & Reuther Gmbh An improved flow metering device
JPH0875621A (en) * 1994-08-31 1996-03-22 Tsukasa Sotsuken:Kk Constant flow rate sampling apparatus using variable cross section critical flow venturi tube using movable venturi tube
JPH08159933A (en) * 1994-11-30 1996-06-21 Tsukasa Sotsuken:Kk Exhaust-gas distributor using movable venturi tube
JPH09218062A (en) * 1996-02-13 1997-08-19 Tsukasa Sotsuken:Kk Variable sectional area venturi type flow meter
US20010013245A1 (en) * 1998-07-09 2001-08-16 Honda Giken Kogyo Kabushiki Kaisha Flow rate detector mechanism with variable venturi and exhaust gas sampling method using the same
US6510746B1 (en) * 1999-07-12 2003-01-28 Ford Global Technologies, Inc. Gas flow measurement
CN101333981A (en) * 2007-06-29 2008-12-31 卡特彼勒公司 Onboard method of determining egr flow rate
CN102944271A (en) * 2012-11-27 2013-02-27 银川融神威自动化仪表厂(有限公司) Composite internal and external venturi tube flowmeter
DE102014212854A1 (en) * 2014-07-02 2016-01-21 Robert Bosch Gmbh Flowmeter
CN209570223U (en) * 2018-12-26 2019-11-01 潍柴动力股份有限公司 A kind of Venturi meter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114413979A (en) * 2022-03-30 2022-04-29 潍柴动力股份有限公司 Venturi tube flow measuring method

Similar Documents

Publication Publication Date Title
CN109827620A (en) A kind of Venturi meter
KR102144559B1 (en) Metering device for introducing a liquid additive into a stream of main liquid
CN106482794B (en) Venturi flowmeter of EGR engine
CN208310917U (en) A kind of switching segment structure solving S bending nozzle and fanjet matching problem
CN109443460A (en) A kind of Venturi meter
CN209570223U (en) A kind of Venturi meter
CN205280157U (en) Differential pressure formula flow measurement mechanism
CN202631014U (en) Three-curve-airfoil rectifying type air flow device
CN204286515U (en) Quarter bend formula electromagnetic flow transducer
CN204241043U (en) Rectangle differential pressure flowmeter
CN207584074U (en) Venturi ball valve
CN107063364A (en) A kind of shrunk type Venturi meter
CN210346776U (en) Rectangular venturi differential pressure device
CN209589148U (en) High-power engine air mass flow measuring device
CN209446109U (en) A kind of Venturi meter
CN209166536U (en) A kind of special flowmeter of text
CN204718653U (en) A kind of distributed stream gauge
CN209296166U (en) A kind of small-bore pipeline temperature measuring equipment
CN207317878U (en) The fluid circuit of specific rectification form
EP2489993A1 (en) Flow measurement device
CN208567986U (en) A kind of flowmeter
MX2021008511A (en) Improved insertion magnetic meters and methods.
CN209239014U (en) The die casting mold core cooling water structure of Tape dispensers
CN209117081U (en) A kind of bypass measuring device of pipeline water flow amount
CN208207002U (en) VAV box apparatus for measuring air quantity

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination