CN109489741A - Fluid flow areal survey device and method - Google Patents
Fluid flow areal survey device and method Download PDFInfo
- Publication number
- CN109489741A CN109489741A CN201710824086.3A CN201710824086A CN109489741A CN 109489741 A CN109489741 A CN 109489741A CN 201710824086 A CN201710824086 A CN 201710824086A CN 109489741 A CN109489741 A CN 109489741A
- Authority
- CN
- China
- Prior art keywords
- pressure
- pressure difference
- fluid flow
- tap
- flow
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring 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
- G01F1/34—Measuring 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
- G01F1/36—Measuring 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention provides a kind of fluid flow areal survey devices, comprising: throttling set, rear and front end are respectively equipped with the first pressure tap and the second pressure tap；Differential pressure pickup, has first interface and second interface, and first interface is connect with the first pressure tap；Solenoid valve, with arrival end, first exit end and second outlet end, the second interface of arrival end and differential pressure pickup is connected, and first exit end is connected to second pressure tap, second outlet end is connected to third pressure tap, and the pressure at third pressure tap is greater than the pressure at second pressure tap；Processor is connect with differential pressure pickup and solenoid valve；Storage medium, stores a plurality of instruction, and processor is made to receive the pressure difference data of differential pressure pickup acquisition when described instruction is executed by processor, and first exit end or the second outlet end of connection solenoid valve are controlled according to pressure difference data.Measuring device of the invention expands the measuring range of flow while guaranteeing measurement accuracy, increases the scope of application of device.
Description
Technical field
The present invention relates to flow detection technical fields, and in particular to a kind of fluid flow areal survey device and method.
Background technique
On the instruments such as lung function instrument, ventilator usually require use flow sensor, mesh on this quasi-instrument use compared with
It is widely differential pressure flow sensor.Differential pressure flow sensor is mainly made of throttling set and differential pressure pickup, common section
Stream device has Venturi tube, orifice plate, nozzle etc., the pressure difference before and after throttling set is measured by differential pressure pickup, then pass through pressure difference
Flow measurement can be realized to calculate uninterrupted.Existing differential pressure flow sensor structure is simple, and measurement is convenient.Due to existing
Differential pressure pickup all have a certain range of measurement error, can make flow occur using the biggish differential pressure pickup of range smaller
When measurement accuracy difference problem；The preferable differential pressure pickup of service precision would generally then make measurement of fluid flow range limited.
Accordingly, it is desirable to provide a kind of fluid flow rate measurement apparatus and measurement method, are guaranteeing differential pressure pickup detection accuracy
While, expand the measuring range of flow.
Summary of the invention
The purpose of the present invention is to provide a kind of fluid flow areal survey device and methods, and solving flow sensor cannot
The problem of taking into account range and detection accuracy.
It is an object of the present invention to provide a kind of fluid flow areal survey devices, comprising:
Throttling set, rear and front end are respectively equipped with the first pressure tap and the second pressure tap；
Differential pressure pickup, has first interface and second interface, and the first interface is connect with first pressure tap；
Solenoid valve has arrival end, first exit end and second outlet end, the arrival end and the second of the differential pressure pickup
Interface connection, the first exit end are connected to second pressure tap, and the second outlet end is connected to third pressure tap, institute
State the pressure that the pressure at third pressure tap is greater than at second pressure tap；
Processor is connect with the differential pressure pickup and solenoid valve；
Storage medium stores a plurality of instruction in the storage medium, and described instruction makes described when being executed by the processor
Reason device receives the pressure difference data of the differential pressure pickup acquisition, and is connected to the first of the solenoid valve according to pressure difference data control and goes out
Mouth end or second outlet end.
Further, the third pressure tap is communicated with the atmosphere.
Further, the throttling set is Venturi tube, and first pressure tap is located at the entrance of the Venturi tube
Section, second pressure tap are located at the venturi of the Venturi tube, and the third pressure tap is located at the expansion of the Venturi tube
Dissipate section.
Further, described device further includes display interface, and the display interface is connected to the processor, for showing
Flow value.
A kind of measurement of fluid flow method using any of the above-described fluid flow areal survey device, comprising the following steps:
S1, determine that the range of flow for obtaining fluid flow by the first pressure difference of measurement is 0 to Q1, determine through the second pressure difference of measurement
The range of flow for obtaining fluid flow is Q1To Q2；The Q1It is the differential pressure pickup maximum range value no more than the first pressure difference
When corresponding flow value, the Q2Corresponding flow value when no more than the second pressure difference being the differential pressure pickup maximum range value；
Pressure difference of first pressure difference between the first pressure tap and the second pressure tap, second pressure difference are the first pressure tap and third
Pressure difference between pressure tap；
S2, fluid is inputted into throttling set；
S3, the solenoid valve first exit end is connected, obtains the first real-time pressure difference；Judge the first real-time pressure difference and the first pressure difference threshold
The relationship of value, first threshold pressure differential are that fluid flow is Q1When collected first pressure difference；First real-time pressure difference≤the
When one threshold pressure differential, fluid flow is determined by the first real-time pressure difference；When first real-time the first threshold pressure differential of pressure difference >, enter step
S4；
S4, second outlet end is connected, obtains the second real-time pressure difference；Judge the relationship of the second real-time pressure difference and the second threshold pressure differential,
Second threshold pressure differential is that fluid flow is Q1When collected second pressure difference；Second real-time pressure difference >=the second threshold pressure differential
When, fluid flow is determined by the second real-time pressure difference；When second real-time the second threshold pressure differential of pressure difference <, return step S3.
Further, the step S3 and S4 is without successive point.
Further, the method also includes providing 0 to Q1The first pressure difference-fluid flow standard in range of flow is bent
Line；And Q1To Q2The second pressure difference-fluid flow standard curve in range of flow；
In the step S2, the fluid flow is that the described first real-time pressure difference is bent in the first pressure difference-fluid flow standard
Corresponding flow value in line；In the step S3, the fluid flow is the described second real-time pressure difference in the second pressure difference-stream
Corresponding flow value in body flow standard curve.
Fluid flow areal survey device provided by the invention, by connecting one between differential pressure pickup and throttling set
A two-bit triplet solenoid valve, can be realized the areal survey of fluid flow.While guaranteeing differential pressure pickup detection accuracy,
Flow measurement range is expanded, the scope of application of fluid flow rate measurement apparatus is increased.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of fluid flow areal survey device in first embodiment of the invention.
Fig. 2 is the partial enlarged view of location A in Fig. 1.
Fig. 3 is the structural schematic diagram of fluid flow areal survey device in second embodiment of the invention.
Fig. 4 is the flow diagram of fluid flow section measuring method of the present invention.
Fig. 5 is the structural schematic diagram of fluid flow rate measurement apparatus in a comparative example of the invention.
Fig. 6 is pressure difference-flow standard curve graph of a comparative example Plays fluid of the invention.
Fig. 7 is the first pressure difference-canonical plotting and the second pressure difference-standard of specific embodiment acceptance of the bid quasi-fluid of the invention
Curve graph.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with drawings and the embodiments,
The present invention will be described in further detail.
With reference to Fig. 1, Fig. 2, first embodiment of the invention provides a kind of fluid flow areal survey device, comprising:
Throttling set 11, rear and front end are respectively equipped with the first pressure tap 111 and the second pressure tap 112；
Differential pressure pickup 12, has first interface and second interface, and the first interface is connect with the first pressure tap 111；
Solenoid valve 13 has arrival end 131, first exit end 132 and second outlet end 133, the arrival end 131 and the pressure
The second interface of gap sensor 12 connects, and the first exit end 132 is connected to second pressure tap 112, and described second goes out
Mouth end 133 is connected to third pressure tap, and the pressure at the third pressure tap is greater than the pressure at second pressure tap 112；
Processor 14 is connect with the differential pressure pickup 12 and solenoid valve 13；
Storage medium 15 stores a plurality of instruction in the storage medium 15, and described instruction makes when being executed by the processor 14
The processor 14 receives the pressure difference data that the differential pressure pickup 12 acquires, and is connected to the electromagnetism according to pressure difference data control
The first exit end 132 of valve 13 or second outlet end 133.
It should be noted that throttling set of the invention has no specifically limited, Venturi tube, orifice plate etc. can be.This reality
It applies in example, the throttling set 11 is orifice plate.
Further, the solenoid valve 13 is two-bit triplet solenoid valve.It can be by being connected to first exit end 132 or the second
Realize the pressure difference between measurement different location in outlet end 133.
Fluid flow rate measurement apparatus structure of the invention is simple, by connecting one between differential pressure pickup and throttling set
The areal survey of fluid flow can be realized in a solenoid valve.When flow is smaller, by the first outlet for connecting solenoid valve
End, the pressure difference that differential pressure pickup measures between the first pressure tap and the second pressure tap can accurately reflect the size of fluid flow；When
When flow is larger, by connecting the second outlet end of solenoid valve, at this point, differential pressure pickup measurement is the first pressure tap and third
Pressure difference between pressure tap, since the pressure at third pressure tap is greater than the pressure at the second pressure tap, so that differential pressure pickup
The pressure difference data of acquisition is opposite to be reduced.To expand flow measurement device under the premise of guaranteeing delta pressure sensor accuracy
Range.
For the third pressure tap being connected to 13 second outlet end 133 of solenoid valve, the present invention only needs to meet without specifically limited
Pressure at third pressure tap is greater than the pressure at second pressure tap.It can be set and be connected to throttling set, it can also
To be directly communicated with the atmosphere.The second outlet end 133 of the present embodiment is directly communicated with the atmosphere.When the second outlet of connection solenoid valve
When holding 133, differential pressure pickup acquisition is gauge pressure at the first pressure tap 111, less than the first pressure tap and the second pressure tap it
Between pressure difference, thus the opposite range for expanding flow measurement device.
Further, the fluid fluid areal survey device further includes display interface (not shown), the display
Interface is connect with processor 14, for showing the flow value being calculated through processor.
With reference to Fig. 3, second embodiment of the invention additionally provides a kind of fluid flow areal survey device, with first embodiment
Difference be that the throttling set 21 of the present embodiment is Venturi tube, the first pressure tap 211 is located at entrance, the second pressure tap
212 are located at venturi, and third pressure tap 213 is located at diffuser.
In Venturi tube 21, since the flow velocity at venturi is greater than the flow velocity of diffuser, according to Bernoulli equation, it is known that larynx
Pressure at road is less than the pressure of diffuser, therefore the first pressure difference between the first pressure tap 211 and the second pressure tap 212 is less than
The second pressure difference between first pressure tap 211 and third pressure tap 213.So that the fluid flow areal survey of the present embodiment
Device expands flow measurement range while guaranteeing differential pressure pickup measurement accuracy.
With reference to Fig. 4, third embodiment of the invention provide it is a kind of using any of the above-described embodiment provide device flowed
The method of body flow areal survey, comprising the following steps:
S1, determine that the range of flow for obtaining fluid flow by the first pressure difference of measurement is 0 to Q1, determine through the second pressure difference of measurement
The range of flow for obtaining fluid flow is Q1To Q2；The Q1It is the differential pressure pickup maximum range value no more than the first pressure difference
When corresponding flow value, the Q2Corresponding flow value when no more than the second pressure difference being the differential pressure pickup maximum range value；
Pressure difference of first pressure difference between the first pressure tap and the second pressure tap, second pressure difference are the first pressure tap and third
Pressure difference between pressure tap；
S2, fluid is inputted into throttling set；
S3, the solenoid valve first exit end is connected, obtains the first real-time pressure difference；Judge the first real-time pressure difference and the first pressure difference threshold
The relationship of value, first threshold pressure differential are that fluid flow is Q1When collected first pressure difference；First real-time pressure difference≤the
When one threshold pressure differential, fluid flow is determined according to the described first real-time pressure difference；When first real-time the first threshold pressure differential of pressure difference >, into
Enter step S4；
S4, second outlet end is connected, obtains the second real-time pressure difference；Judge the relationship of the second real-time pressure difference and the second threshold pressure differential,
Second threshold pressure differential is that fluid flow is Q1When collected second pressure difference；Second real-time pressure difference >=the second threshold pressure differential
When, fluid flow is determined according to the described second real-time pressure difference；When second real-time the second threshold pressure differential of pressure difference <, return step S3.
Further, the step S3 and step step S4 has no successive point.
Further, the method also includes providing 0 to Q1The first pressure difference-fluid flow standard in range of flow is bent
Line；And Q1To Q2The second pressure difference-fluid flow standard curve in range of flow.
Further, the obtaining step of the first pressure difference-fluid flow standard curve is as follows: 0 to Q1Range of flow
Interior, the standard flow of different flow in Xiang Suoshu throttling set acquires the first pressure tap and second using the differential pressure pickup
The first pressure difference between pressure tap, the relation curve being fitted between the first pressure difference and standard flow flow obtain the first pressure difference-
Fluid flow standard curve；The obtaining step of the second pressure difference-fluid flow standard curve is as follows: in Q1To Q2Range of flow
It is interior, in Xiang Suoshu throttling set input different flow standard flow, using the differential pressure pickup acquire the first pressure tap and
The second pressure difference between third pressure tap is fitted the relation curve between the second pressure difference and standard flow flow and obtains the second pressure
Difference-fluid flow standard curve.
In the step S2, the fluid flow is the described first real-time pressure difference in the first pressure difference-fluid flow mark
Corresponding flow value in directrix curve；In the step S3, the fluid flow is the described second real-time pressure difference in second pressure
Corresponding flow value in difference-fluid flow standard curve.
Flow section measuring method disclosed by the invention determines fluid stream by the first pressure difference in 0 to Q1 measurement range
Amount；In Q1To Q2Measurement range in, fluid flow is determined by the second pressure difference.With in entire measurement range use identical pressure
Gap sensor acquires the first pressure difference and determines that the technical solution of fluid flow is compared, and measurement method of the invention expands flow measurement
Range.
Below by way of a comparative example and a specific embodiment comparison operation to the beneficial effect of above-described embodiment carry out into
One step explanation.
With reference to Fig. 4, a comparative example of the invention provides a kind of flow measurement device, and not cocurrent flow is inputted into throttling set 31
The standard flow of amount measures throttle orifice rear and front end pressure difference using differential pressure pickup 32, obtains pressure difference-fluid as shown in Figure 5
Flow standard curve: P=0.0594q2- 0.309q + 5.7704.The maximum range of differential pressure pickup 32 is in this programme
1.2KPa, corresponding maximum flow range are 144L/min.
When measuring fluid flow using the flow measurement device of this comparative example, by inputting fluid into throttling set 31,
Real-time pressure difference is measured by differential pressure pickup 32 again, real-time pressure difference is in the pressure difference-fluid flow standard curve P=0.0594q2
Corresponding flow value is fluid flow in -0.309q+5.7704.
Fluid flow areal survey device described in a specific embodiment of the invention is as shown in Figure 1, the differential pressure pickup
12 maximum range is 1.2KPa, determines the flow Q of the numerical value less than 144L/min1, Q is determined in the present embodiment1For 50L/
min。
In the measurement range that flow is 0 to 50L/min, it is connected to the first exit end 132 of solenoid valve 13, to throttling set
The fluid that different flow is inputted in 11 acquires the first pressure difference data by differential pressure pickup 12, obtains as shown in Figure 6 first
Pressure difference-fluid flow standard curve: P1 = 0.0564q2 + 0.0516q - 0.2209。
When flow is greater than 50L/min, it is connected to the second outlet end 133 of solenoid valve 13, is inputted not into throttling set 11
With the fluid of flow, the second pressure difference data is acquired by differential pressure pickup 12, obtains the second pressure difference-fluid as shown in Figure 6
Flow standard curve: P2 = 0.0256q2+ 0.7916q- 9.06.When the second pressure difference reaches the differential pressure pickup 12 most
When wide range 1.2KPa, the corresponding flow Q in the second pressure difference-fluid flow standard curve2For 202L/min, i.e., the described flow
The maximum range of the measuring flow of areal survey device is 202L/min.Compared with 144 L/min of maximum range of comparative example, this
Invention considerably increases measurement of fluid flow range.
In the present embodiment, the first threshold pressure differential is 142.71Pa, and the second threshold pressure differential is 63.81Pa.Using the present embodiment
Flow areal survey device measures fluid flow, and steps are as follows:
Fluid is inputted into throttling set 11；
The first exit end 132 for connecting solenoid valve 13 measures the first real-time pressure difference by differential pressure pickup 12；First real-time pressure difference
When≤142.71Pa, the first real-time pressure difference is in the first pressure difference-fluid flow standard curve P1 = 0.0564q2 + 0.0516q -
Corresponding flow value is fluid flow in 0.2209；
When the first real-time pressure difference > 142.71Pa, the second outlet end 133 of solenoid valve 13 is connected, is measured by differential pressure pickup 12
Second real-time pressure difference, when the second real-time pressure difference > 63.81Pa, the second real-time pressure difference is in the second pressure difference-fluid flow standard curve
P2 = 0.0256q2Corresponding flow value is fluid flow in+0.7916q- 9.06.It should be noted that in this step,
If acquire second real-time pressure difference≤Pa, returns to previous step and survey the first real-time pressure difference.
The foregoing is merely better embodiments of the invention, are not intended to limit the invention, all of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within spirit and principle.
Claims (7)
1. a kind of fluid flow areal survey device characterized by comprising
Throttling set, rear and front end are respectively equipped with the first pressure tap and the second pressure tap；
Differential pressure pickup, has first interface and second interface, and the first interface is connect with first pressure tap；
Solenoid valve has arrival end, first exit end and second outlet end, the arrival end and the second of the differential pressure pickup
Interface connection, the first exit end are connected to second pressure tap, and the second outlet end is connected to third pressure tap, institute
State the pressure that the pressure at third pressure tap is greater than at second pressure tap；
Processor is connect with the differential pressure pickup and solenoid valve；
Storage medium stores a plurality of instruction in the storage medium, and described instruction makes described when being executed by the processor
Reason device receives the pressure difference data of the differential pressure pickup acquisition, and is connected to the first of the solenoid valve according to pressure difference data control and goes out
Mouth end or second outlet end.
2. fluid flow areal survey device according to claim 1, which is characterized in that the third pressure tap and atmosphere
Connection.
3. fluid flow areal survey device according to claim 1, which is characterized in that the throttling set is venturi
Pipe, first pressure tap are located at the entrance of the Venturi tube, and second pressure tap is located at the larynx of the Venturi tube
At road, the third pressure tap is located at the diffuser of the Venturi tube.
4. fluid flow areal survey device according to claim 1, which is characterized in that described device further includes display circle
Face, the display interface is connected to the processor, for showing flow value.
5. a kind of measurement of fluid flow method of fluid flow areal survey device as described in claim 1, which is characterized in that
The following steps are included:
S1, determine that the range of flow for obtaining fluid flow by the first pressure difference of measurement is 0 to Q1, determine through the second pressure difference of measurement
The range of flow for obtaining fluid flow is Q1To Q2；The Q1It is the differential pressure pickup maximum range value no more than the first pressure difference
When corresponding flow value, the Q2Corresponding flow value when no more than the second pressure difference being the differential pressure pickup maximum range value；
Pressure difference of first pressure difference between the first pressure tap and the second pressure tap, second pressure difference are the first pressure tap and third
Pressure difference between pressure tap；
S2, fluid is inputted into throttling set；
S3, the solenoid valve first exit end is connected, obtains the first real-time pressure difference；Judge the first real-time pressure difference and the first pressure difference threshold
The relationship of value, first threshold pressure differential are that fluid flow is Q1When collected first pressure difference；First real-time pressure difference≤the
When one threshold pressure differential, fluid flow is determined by the first real-time pressure difference；When first real-time the first threshold pressure differential of pressure difference >, enter step
S4；
S4, second outlet end is connected, obtains the second real-time pressure difference；Judge the relationship of the second real-time pressure difference and the second threshold pressure differential,
Second threshold pressure differential is that fluid flow is Q1When collected second pressure difference；Second real-time pressure difference >=the second threshold pressure differential
When, fluid flow is determined by the second real-time pressure difference；When second real-time the second threshold pressure differential of pressure difference <, return step S3.
6. fluid flow section measuring method according to claim 5, which is characterized in that the step S3 and S4 is without successive
Point.
7. measurement of fluid flow method according to claim 5, which is characterized in that the method also includes providing 0 to Q1Stream
Measure the first pressure difference-fluid flow standard curve in range；And Q1To Q2The second pressure difference-fluid flow mark in range of flow
Directrix curve；
In the step S2, the fluid flow is that the described first real-time pressure difference is bent in the first pressure difference-fluid flow standard
Corresponding flow value in line；In the step S3, the fluid flow is the described second real-time pressure difference in the second pressure difference-stream
Corresponding flow value in body flow standard curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710824086.3A CN109489741A (en) | 2017-09-13 | 2017-09-13 | Fluid flow areal survey device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710824086.3A CN109489741A (en) | 2017-09-13 | 2017-09-13 | Fluid flow areal survey device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109489741A true CN109489741A (en) | 2019-03-19 |
Family
ID=65689049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710824086.3A Pending CN109489741A (en) | 2017-09-13 | 2017-09-13 | Fluid flow areal survey device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109489741A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432916A (en) * | 2021-12-30 | 2022-05-06 | 北京航天长峰股份有限公司 | Gas mixing equipment |
| CN114459549A (en) * | 2022-02-10 | 2022-05-10 | 北京强度环境研究所 | Large-range angle self-adaptive uniform-velocity tube flowmeter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071008A (en) * | 1992-09-28 | 1993-04-14 | 范玉久 | Line changeable range flowmeter |
| CN1188231A (en) * | 1997-01-15 | 1998-07-22 | 机械工业部上海工业自动化仪表研究所 | Wide-range differential pressure type flowmeter |
| US6510746B1 (en) * | 1999-07-12 | 2003-01-28 | Ford Global Technologies, Inc. | Gas flow measurement |
| US7568383B2 (en) * | 2004-05-24 | 2009-08-04 | Ford Global Technologies, Llc | Portable vehicle exhaust flow sensor |
| CN106248159A (en) * | 2016-08-08 | 2016-12-21 | 广州七喜医疗设备有限公司 | A kind of device and method improving flow measurement precision |
| CN106525173A (en) * | 2016-11-15 | 2017-03-22 | 中国核动力研究设计院 | Flow measuring device capable of seamlessly switching ranges |
-
2017
- 2017-09-13 CN CN201710824086.3A patent/CN109489741A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071008A (en) * | 1992-09-28 | 1993-04-14 | 范玉久 | Line changeable range flowmeter |
| CN1188231A (en) * | 1997-01-15 | 1998-07-22 | 机械工业部上海工业自动化仪表研究所 | Wide-range differential pressure type flowmeter |
| US6510746B1 (en) * | 1999-07-12 | 2003-01-28 | Ford Global Technologies, Inc. | Gas flow measurement |
| US7568383B2 (en) * | 2004-05-24 | 2009-08-04 | Ford Global Technologies, Llc | Portable vehicle exhaust flow sensor |
| CN106248159A (en) * | 2016-08-08 | 2016-12-21 | 广州七喜医疗设备有限公司 | A kind of device and method improving flow measurement precision |
| CN106525173A (en) * | 2016-11-15 | 2017-03-22 | 中国核动力研究设计院 | Flow measuring device capable of seamlessly switching ranges |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114432916A (en) * | 2021-12-30 | 2022-05-06 | 北京航天长峰股份有限公司 | Gas mixing equipment |
| CN114459549A (en) * | 2022-02-10 | 2022-05-10 | 北京强度环境研究所 | Large-range angle self-adaptive uniform-velocity tube flowmeter |
| CN114459549B (en) * | 2022-02-10 | 2024-05-10 | 北京强度环境研究所 | Large-range angle self-adaptive uniform velocity tube flowmeter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101354273B (en) | Method and device for measuring compound type gas flow | |
| EP2893301B1 (en) | Self-diagnosing differential pressure flow meter | |
| WO2008058872A3 (en) | Device for measuring the total pressure of a flow and method using said device | |
| US8701497B2 (en) | Fluid flow testing system | |
| CN109489741A (en) | Fluid flow areal survey device and method | |
| JP5113722B2 (en) | Flow measuring device | |
| CN109340585A (en) | A kind of pipeline leakage testing and localization method | |
| CN205280157U (en) | Differential pressure formula flow measurement mechanism | |
| CN106706268A (en) | Method and device for measuring viscous resistance coefficient and inertial resistance coefficient of porous medium | |
| CN109211372A (en) | Low pressure critical flow venturi nozzle calibrating installation | |
| US11326921B2 (en) | Flow rate measuring method and flow rate measuring device | |
| CN101349581B (en) | Insert type flow measuring device based on MEMS sensor | |
| CN103791951A (en) | Positive-pressure standard gas flowmeter and positive-pressure standard gas flow metering method | |
| CN106289416B (en) | A kind of critical Venturi nozzle method of calculating flux | |
| CN105181049B (en) | Measurement method, measuring system and the auxiliary measurement system of fluids within pipes flow | |
| CN102590057B (en) | Method for measuring draw resistance value of draw resistance standard rod and method for checking calibration value of draw resistance standard rod | |
| CN201262559Y (en) | Plug-in flow measuring device based on MEMS sensor | |
| CN208366792U (en) | Air permeability detection device | |
| CN105091967B (en) | A kind of flow-measuring method using barrier in pipeline itself or pipeline | |
| CN104502039A (en) | Gas tightness detecting method for fuel gas meter | |
| CN211904339U (en) | On-line detection standard device for small-flow gas flowmeter | |
| CN114252119A (en) | High-precision ultralow-flow bubble flow instrument and flow calibration method | |
| WO2021031217A1 (en) | Wet gas flow measurement method based on coriolis mass flowmeter, and apparatus therefor | |
| CN202599631U (en) | Gas leakage detection system | |
| CN103076068A (en) | Method and device for calibrating flowmeter of anesthesia apparatus |
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 | ||
| CB02 | Change of applicant information |
Address after: Longgang District of Shenzhen City, Guangdong province 518116 Longgang Street Community 6 new road bridge Baolong Baolong Industrial Park building B building 1-3 floor Applicant after: Shenzhen meimeimeichuangyi Medical Technology Co., Ltd Address before: Longgang District of Shenzhen City, Guangdong province 518116 Longgang Street Community 6 new road bridge Baolong Baolong Industrial Park building B building 1-3 floor Applicant before: MEHOW INNOVATIVE Ltd. |
|
| CB02 | Change of applicant information | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190319 |
|
| WD01 | Invention patent application deemed withdrawn after publication |