CN104964721B - The gas flow structure of mass air flow sensor - Google Patents
The gas flow structure of mass air flow sensor Download PDFInfo
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- CN104964721B CN104964721B CN201510385785.3A CN201510385785A CN104964721B CN 104964721 B CN104964721 B CN 104964721B CN 201510385785 A CN201510385785 A CN 201510385785A CN 104964721 B CN104964721 B CN 104964721B
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- 238000005259 measurement Methods 0.000 claims abstract description 57
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 230000000630 rising effect Effects 0.000 claims description 19
- 230000007704 transition Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000000739 chaotic effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008246 gaseous mixture Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002510 pyrogen Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention provides a kind of gas flow structure of mass air flow sensor, including matrix and top cover, top cover to be fastened on matrix；The relative air inlet in position and gas outlet, and the split channel and Measurement channel connected with air inlet and gas outlet are provided with described matrix, the split channel and Measurement channel are separated by a central protuberance；The both sides of air inlet are provided with chamfering so that air inlet is round and smooth to be extended out in horn-like；By the gas that air inlet enters after the shunting tip shunting of central protuberance, split channel is partly into, another part enters Measurement channel；The straightway position correspondence of split channel and central protuberance, straight sidewall of the gas along split channel both sides into split channel are gradually tapered up to gas outlet from upstream to downstream.The present invention has carried out particular design to gas flow structure so that the measurement result using the mass air flow sensor of the gas flow structure is more accurate, and when air velocity changes, its high low speed measurement sensitivity is more balanced.
Description
Technical field
The invention belongs to auto-parts field, and in particular to a kind of gas flow structure of mass air flow sensor.
Background technology
With the raising required engine automobile exhaust emissions, increasing engine is using accurate air mass flow
Meter metering is into the air capacity of engine, and Engine ECU is according to the basic fuel delivery of air flow meter signal initial setting, to meet
The various operating mode air-fuel ratios of engine, and then ensure requirement of the various operating modes of engine to gaseous mixture.
Thermal air flowmeter is one kind in mass air flow sensor, and it is to utilize pyrogen and the tested air in air-flow
Between heat exchange relationship measure a kind of sensor of current MAF.Its operation principle is：By heater element
It is placed among air-flow, with air heat exchange occurs for its surface, and some parameters of heat exchange are carried out by sensor circuit
Detection, and the gas flow near heater element is obtained, so as to extrapolate the gas flow of whole pipeline.
Thermal air flowmeter generally comprises supporter and measuring cell, and the supporter is arranged on such as engine suction
In the side wall of pipeline, and the gas flow structure passed through with supplied gas；The measuring cell includes a sensor, for detecting
The change of air-flow, the temperature change of the sensor surface caused by its change by air-flow velocity measure air mass flow.By
It is to carry out heat exchange degree with air draught to judge air flow rate, therefore inlet air by detection heater element in sensor
Flow regime can have large effect to the measurement result of sensor.
Current thermal air flowmeter is usually present the problem of such when carrying out flow measurement, i.e., in air velocity
When relatively low, air mass flow is smaller, and the sensitivity of sensor detection changes in flow rate is higher；And when air velocity is higher, air stream
Measure it is larger, sensor detection changes in flow rate sensitivity it is relatively low.Therefore this mass air flow sensor when air velocity changes,
It is unbalanced because of high low speed measurement sensitivity, measurement accuracy can be influenceed.
The content of the invention
The present invention be directed to above-mentioned the deficiencies in the prior art, there is provided it is a kind of can make mass air flow sensor sensitivity it is more equal
The gas flow structure of the higher mass air flow sensor of weighing apparatus, accuracy of measurement.
The present invention is achieved through the following technical solutions：
A kind of gas flow structure of mass air flow sensor, including matrix and top cover, the top cover are fastened on matrix and formed
The gas flow structure；
It is characterized in that：It is provided with the relative air inlet in position and gas outlet in described matrix, and with air inlet and going out
The split channel and Measurement channel that gas port connects, the split channel and Measurement channel are separated by a central protuberance；
The circumference of the central protuberance includes a straightway, an entrance curve section, a measurement arc section and an outlet
The junction of curved section, the straightway and entrance curve section forms a shunting tip, and the entrance curve section passes through S type transition
Straightway and measurement arc section are linked together；The exit curve will measure arc section and straightway by the transition of S types
Link together, the junction of the exit curve and straightway forms one and confluxed tip；
The both sides of the air inlet are provided with chamfering so that air inlet is round and smooth to be extended out in horn-like；Entered by air inlet
Gas through central protuberance shunting tip shunting after, be partly into split channel, another part enters Measurement channel；It is described
The straightway position correspondence of split channel and central protuberance, into straight sidewall of the gas along split channel both sides of split channel
Gradually tapered up from upstream to downstream to gas outlet.
Preferably, horizontal flow channel, longitudinal main channel and the horizontal outflow that the Measurement channel includes being sequentially communicated are logical
Road；
The horizontal flow channel corresponds to the entrance curve fragment position of central protuberance, and the horizontal flow pass corresponds to
The exit curve fragment position of central protuberance；
Raised measurement arc section centered on one side wall of longitudinal main channel, one and institute are provided with another side wall
State measurement arc section radian and unanimously, towards opposite curved surface, the centre position of the curved surface be provided with a breach, the breach is used
In insertion sensor chip；
A rising step is provided with the bottom surface of longitudinal main channel, passes through slope between the rising step and bottom surface
Transition；The position corresponding with rising step is provided with one with rising ledge structure identical decline step on the top cover；Institute
State and leave gap between the bottom of breach and rising step；
The structure of the Measurement channel cause top cover fasten after, into Measurement channel gas first along horizontal inflow
The curvilinear sidewall of passage both sides, keep cross-sectional area it is constant flow to longitudinal main channel；Afterwards due to surveying in longitudinal main channel
Arc section, curved surface are measured, rise step and declines the limitation of step so that the gas of entrance is first in left and right directions and above-below direction
From large to small, then that changes from small to big flow to horizontal flow pass, and along the curvilinear sidewall of horizontal flow pass both sides, keeps horizontal
Sectional area it is constant flow to gas outlet；Converge and flow out in gas outlet through split channel and Measurement channel.
Preferably, a through hole is offered on the bottom surface of the Measurement channel, corresponding position also offers on the top cover
One through hole, the sizes of two through holes is identical, central axis overlaps.
The present invention has the advantages that：
1st, to having carried out particular design from gas flow structure, extraneous gas enters the present invention from horn-like air inlet first
Enter, be split into two-way through shunting tip, wherein bending enters horizontal flow channel all the way, curve is provided with horizontal flow channel
Side wall, gas can effectively be guided so that chaotic gas gradually tends towards stability；It is main logical that gas bending afterwards enters longitudinal direction
Road, longitudinal main channel have approximate Double bell-mouth structure of air, gas can first be compressed and amplified again, finally logical via laterally outflow
The curvilinear sidewall outflow in road；This kind of structure make it that the gas stabilization of flows through sensor chip position is more preferable, and then causes air
The measurement result of flowmeter is more accurate.
2nd, gas flow structure of the present invention is by shunting the sophisticated gas distribution by entrance into two-way, gas flow rate
The air-flow ratio of split channel and Measurement channel is about 2: 8 when relatively low；When gas flow rate is higher, the gas of split channel is fast
Speed outflow, makes the space of surrounding form certain negative pressure, so that the gas ratio into Measurement channel increases, is surveyed through experiment
3: 7 can be risen to by 2: 8 by determining the air-flow ratio of split channel and Measurement channel, so that when air velocity is higher, sensing
The sensitivity of device chip detection changes in flow rate improves.
3rd, gas flow structure of the present invention inserts sensor by being provided on the curved surface of longitudinal main channel
The breach of chip, and leave certain interval between the bottom of breach and rising step so that dust can flow through from bottom gap,
Prevent the impurity such as dust from being collided with sensor chip surface, play a part of protecting sensor chip and filtering, so as to
So that measurement data is more accurate.
4th, gas flow structure of the present invention is by shunting the sophisticated gas distribution by entrance into two-way, this shunting
Setting can stop that large particulate matter enters Measurement channel, and better working environment can be provided for sensor chip.
Brief description of the drawings
Fig. 1 is the structure chart of the gas flow structure；
Fig. 2 is the structure chart inserted in matrix after sensor chip；
Fig. 3 is the structure chart of matrix；
Fig. 4 is the structure chart of top cover；
The implication of each label is as follows in figure：
Matrix 1, top cover 2, air inlet 3, gas outlet 4, split channel 5, Measurement channel 6, central protuberance 7, sensor chip
8th, through hole 9, horizontal flow channel 61, longitudinal main channel 62, horizontal flow pass 63, curved surface 64, rising step 65, decline step
66th, straightway 71, entrance curve section 72, measurement arc section 73, exit curve 74, shunting tip 75, tip 76 of confluxing.
Embodiment
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
As Figure 1-4, the invention provides a kind of gas flow structure of mass air flow sensor, including matrix 1 and top cover
2, the top cover 2, which is fastened on matrix 1, forms the gas flow structure；Matrix 1 and top cover 2 can be split-type structural,
It can be integral structure.
The gas flow structure is used in mass air flow sensor, when air flows through the gas flow structure, is placed in the gas
Sensor core sector-meeting in flow passage structure detects to some parameters, so as to calculate the air mass flow of whole pipeline.
The present invention is improved only for gas flow structure, and the gas flow structure is except can be used for mass air flow sensor
Outside, it can be also used for any sensor device for thering is fluid media (medium) to flow through.
The relative air inlet 3 in position and gas outlet 4 are provided with described matrix 1, and it is equal with air inlet 3 and gas outlet 4
The split channel 5 and Measurement channel 6 of connection, the split channel 5 and Measurement channel 6 are separated by a central protuberance 7；
The circumference of the central protuberance 7 includes a straightway 71, an entrance curve section 72, one measurement arc section 73 and
The junction of one exit curve 74, the straightway 71 and entrance curve section 72 forms a shunting tip 75, and the entrance is bent
Line segment 72 is linked together straightway 71 and measurement arc section 73 by the transition of S types；The exit curve 74 passes through S type mistakes
Cross and measurement arc section 73 links together with straightway 71, the junction of the exit curve 74 and straightway 71 forms one
Conflux tip 76；
The both sides of the air inlet 3 are provided with chamfering so that air inlet 3 is round and smooth to be extended out in horn-like；Entered by air inlet 3
The gas entered is partly into split channel 5, it is logical that another part enters measurement after the shunting of shunting tip 75 of central protuberance 7
Road 6；
The split channel 5 and the position correspondence of straightway 71 of central protuberance 7, into the gas edge shunting of split channel 5
The straight sidewall of the both sides of passage 5 is gradually tapered up to gas outlet 4 from upstream to downstream；
The Measurement channel 6 includes horizontal flow channel 61, longitudinal main channel 62 and the horizontal flow pass being sequentially communicated
63；
The horizontal flow channel 61 corresponds to the position of entrance curve section 72 of central protuberance 7, the horizontal flow pass
63 correspond to the position of exit curve 74 of central protuberance 7；
The measurement arc section 73 of projection 7 centered on one side wall of longitudinal main channel 62, is provided with another side wall
One unanimously, towards opposite curved surface 64, the centre position of the curved surface 64 is provided with a breach with the measurement arc section radian,
The breach is used to insert sensor chip 8；
A rising step 65 is provided with the bottom surface of longitudinal main channel 62, is led between the rising step 65 and bottom surface
Cross sloped transition；The position corresponding with rising step 65 is provided with one with rising the structure identical of step 65 on the top cover 2
Decline step 66；Gap is left between the bottom of the breach and rising step 65；
The structure of the Measurement channel 6 cause top cover 2 fasten after, into Measurement channel 6 gas first along transverse direction
The curvilinear sidewall of the both sides of flow channel 61, keep cross-sectional area it is constant flow to longitudinal main channel 62；Afterwards in longitudinal main channel
Due to measurement arc section 73, curved surface 64, the limitation for rising step 65 and decline step 66 in 62 so that the gas of entrance is in left and right
First from large to small, then that changes from small to big flow to horizontal flow pass 63 for direction and above-below direction, and along horizontal flow pass
The curvilinear sidewall of 63 both sides, keep cross-sectional area it is constant flow to gas outlet 4；Through split channel 5 and Measurement channel 6 in gas outlet
4 convergence outflows.
Preferably, a through hole 9 is offered on the bottom surface of the Measurement channel 6, corresponding position also opens up on the top cover 2
There is a through hole 9, the sizes of two through holes 9 is identical, central axis overlaps, and can so prevent the gas flow structure in air-flow
Howling is sent when flowing through.
The present invention can change into that various ways are apparent to one skilled in the art, and such change is not considered as
Depart from the scope of the present invention.All such technical staff to the field obviously change, and are included within this right
Within the scope of it is required that.
Claims (2)
1. a kind of gas flow structure of mass air flow sensor, including matrix (1) and top cover (2), the top cover (2) are fastened on matrix
(1) the gas flow structure is formed on；
It is characterized in that：The relative air inlet in position (3) and gas outlet (4), and and air inlet are provided with described matrix (1)
(3) split channel (5) and Measurement channel (6) connected with gas outlet (4), the split channel (5) and Measurement channel (6) are logical
A central protuberance (7) is crossed to separate；
The circumference of the central protuberance (7) includes a straightway (71), an entrance curve section (72), a measurement arc section
(73) and an exit curve (74), the straightway (71) and the shunting of junction formation one of entrance curve section (72) are sophisticated
(75), the entrance curve section (72) is linked together straightway (71) and measurement arc section (73) by the transition of S types；It is described
Exit curve (74) will measure arc section (73) by the transition of S types and be linked together with straightway (71), the exit curve
The junction of section (74) and straightway (71) forms one and confluxed sophisticated (76)；
The both sides of the air inlet (3) are provided with chamfering so that air inlet (3) is round and smooth to be extended out in horn-like；By air inlet (3)
The gas of entrance is partly into split channel (5), another part enters after shunting sophisticated (75) shunting of central protuberance (7)
Enter Measurement channel (6)；The split channel (5) and straightway (71) position correspondence of central protuberance (7), into split channel
(5) straight sidewall of the gas along split channel (5) both sides is gradually tapered up to gas outlet (4) from upstream to downstream；
Horizontal flow channel (61), longitudinal main channel (62) and the horizontal outflow that the Measurement channel (6) includes being sequentially communicated are logical
Road (63)；
The horizontal flow channel (61) corresponds to entrance curve section (72) position of central protuberance (7), and the laterally outflow is logical
Road (63) corresponds to exit curve (74) position of central protuberance (7)；
The measurement arc section (73) of raised (7) centered on one side wall of longitudinal main channel (62), set in another side wall
There is one unanimously, towards opposite curved surface (64), the interposition of the curved surface (64) to be installed with described measurement arc section (73) radian
A breach is equipped with, the breach is used to insert sensor chip (8)；
A rising step (65) is provided with the bottom surface of longitudinal main channel (62), the rising step (65) is between bottom surface
Pass through sloped transition；The position corresponding with rising step (65) is provided with one and tied with rising step (65) on the top cover (2)
Structure identical declines step (66)；Gap is left between the bottom of the breach and rising step (65)；
The structure of the Measurement channel (6) cause top cover (2) fasten after, into Measurement channel (6) gas first along horizontal stroke
To the curvilinear sidewall of flow channel (61) both sides, keep cross-sectional area it is constant flow to longitudinal main channel (62)；Afterwards in longitudinal direction
Due to measurement arc section (73), curved surface (64), the limitation for rising step (65) and decline step (66) in main channel (62) so that
In left and right directions and above-below direction first from large to small, then that changes from small to big flow to horizontal flow pass (63) to the gas of entrance,
And along the curvilinear sidewall of horizontal flow pass (63) both sides, keep cross-sectional area it is constant flow to gas outlet (4)；It is logical through shunting
Road (5) and Measurement channel (6) converge in gas outlet (4) to flow out.
2. the gas flow structure of mass air flow sensor according to claim 1, it is characterised in that the Measurement channel (6)
Bottom surface on offer a through hole (9), corresponding position also offers a through hole (9), two through holes (9) on the top cover (2)
Size is identical, central axis overlaps.
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| CN201510385785.3A CN104964721B (en) | 2015-06-30 | 2015-06-30 | The gas flow structure of mass air flow sensor |
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| CN201510385785.3A CN104964721B (en) | 2015-06-30 | 2015-06-30 | The gas flow structure of mass air flow sensor |
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| CN104964721B true CN104964721B (en) | 2017-12-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204730899U (en) * | 2015-06-30 | 2015-10-28 | 蔡丰勇 | The gas flow structure of air flowmeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60120339T2 (en) * | 2001-01-05 | 2007-06-06 | NGK Spark Plug Co., Ltd., Nagoya | Gas flow measurement device |
| DE10135142A1 (en) * | 2001-04-20 | 2002-10-31 | Bosch Gmbh Robert | Device for determining at least one parameter of a medium flowing in a line |
| JP2002333347A (en) * | 2001-05-08 | 2002-11-22 | Ngk Spark Plug Co Ltd | Distributary flow meter |
| JP2003090750A (en) * | 2001-09-19 | 2003-03-28 | Ngk Spark Plug Co Ltd | Flow rate/flow velocity measuring apparatus |
| JP5178148B2 (en) * | 2007-10-31 | 2013-04-10 | 日立オートモティブシステムズ株式会社 | Heating resistor type air flow measuring device |
| DE102008049843B4 (en) * | 2008-10-01 | 2010-10-14 | Continental Automotive Gmbh | Air mass sensor |
| DE102008052404B4 (en) * | 2008-10-21 | 2014-05-28 | Continental Automotive Gmbh | Method for producing a mass flow sensor device |
| DE102010020264A1 (en) * | 2010-05-28 | 2011-12-01 | Continental Automotive Gmbh | Air flow sensor |
| JP5170209B2 (en) * | 2010-10-28 | 2013-03-27 | 株式会社デンソー | Flow measuring device |
| JP5632881B2 (en) * | 2012-06-15 | 2014-11-26 | 日立オートモティブシステムズ株式会社 | Thermal flow meter |
| JP6114673B2 (en) * | 2013-09-30 | 2017-04-12 | 日立オートモティブシステムズ株式会社 | Thermal flow meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204730899U (en) * | 2015-06-30 | 2015-10-28 | 蔡丰勇 | The gas flow structure of air flowmeter |
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Effective date of registration: 20200312 Address after: 325204 No.1, Jixiang Road, Tangxia Town, Ruian City, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Baian Technology Co., Ltd Address before: Auspicious Road North Industrial Park, 325204 Zhejiang city of Wenzhou province Ruian City Tangxia No. 1 Patentee before: Cai Fengyong |