CN110763867B - Pipeline speed measuring device - Google Patents
Pipeline speed measuring device Download PDFInfo
- Publication number
- CN110763867B CN110763867B CN201911241034.9A CN201911241034A CN110763867B CN 110763867 B CN110763867 B CN 110763867B CN 201911241034 A CN201911241034 A CN 201911241034A CN 110763867 B CN110763867 B CN 110763867B
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- pitot tube
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- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 238000009434 installation Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 5
- 230000000670 limiting effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000002441 reversible effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
- G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
- G01P5/165—Arrangements or constructions of Pitot tubes
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Pipeline Systems (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention provides a pipeline speed measuring device. Comprises a frame and three speed measuring mechanisms which are sequentially arranged on the frame along the height direction; the speed measuring mechanism comprises a Pitot tube and a linear module; the three linear modules are distributed in an angle mode; the three linear modules extend in the length direction and intersect with the circle center of the measured pipeline, each linear module is provided with a pitot tube on a sliding block, the pitot tube can conduct linear motion along the length direction of the linear module, wind speeds of different pipe diameter positions of the measured pipeline are measured, 60-degree intervals are reserved between two adjacent linear modules, and coverage of measuring points of all areas in the measured pipeline is achieved. According to the invention, three linear modules are arranged every two at 60 degrees, the pitot tube is arranged on the sliding block of the linear module and slides along the length direction of the linear module, and full coverage measurement is carried out on radial measuring points of the circular pipeline; the accuracy of the measuring position of the pitot tube and the consistency of repeated measurement are ensured by controlling the movement of the linear module, and the accuracy of the measuring result is improved.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a pipeline speed measuring device.
Background
Pitot tubes, also known as pitot tubes or tachometers, are instruments that calculate flow rate by measuring the difference between the total pressure and the static pressure of a fluid. When the flow measurement in the air duct adopts a pitot tube traversing method, 24 or more measuring points are arranged under one working condition, as shown in fig. 2; the traditional measurement mode adopts a single pitot tube to measure the wind speed in the pipeline, so that the speed measurement work of all measurement points is completed, and the manual measurement workload is very large; and the radial positioning precision, the positioning precision of the measuring angle and the repeatability of the measurement of the pipeline of the pitot tube are difficult to ensure during manual measurement, and the measurement result is adversely affected.
In view of the foregoing, there is a need for a device for measuring speed of a pipeline to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a pipeline speed measuring device which is used for solving the problems of measuring a plurality of speed measuring points by using a Pitot tube and guaranteeing the position accuracy of measuring points.
In order to achieve the above purpose, the invention provides a pipeline speed measuring device, which comprises a frame and three speed measuring mechanisms sequentially arranged on the frame along the height direction;
The speed measuring mechanism comprises a Pitot tube and a linear module; the three linear modules are distributed in an angle mode; the three linear modules extend in the length direction and intersect with the circle center of the measured pipeline, each linear module is provided with a pitot tube on a sliding block, the pitot tubes can conduct linear motion along the length direction of the linear modules, wind speeds of different pipe diameter positions of the measured pipeline are measured, and the coverage of measuring points of all areas in the measured pipeline is achieved.
Preferably, the rack comprises a screw rod mechanism, and an upper mounting frame, a middle mounting frame and a lower mounting frame which are sequentially arranged along the height direction of the screw rod mechanism; the three linear modules are respectively arranged on the upper mounting frame, the middle mounting frame and the lower mounting frame, the space between every two adjacent linear modules is 60 degrees, and the length direction of the linear module at the middle position is parallel to the horizontal plane.
Preferably, the upper mounting frame, the middle mounting frame and the lower mounting frame all comprise detachable mounting frames; the three mounting frames are sequentially mounted on the screw rod mechanism along the height direction.
Preferably, the connection part of the mounting frame and the screw rod mechanism is provided with paired fixing nuts for adjusting and fixing the height positions of the upper mounting frame, the middle mounting frame and the lower mounting frame.
Preferably, the mounting frame is provided with kidney-shaped holes along the length direction for adjusting the horizontal distance between the upper mounting frame, the middle mounting frame and the lower mounting frame relative to the detected pipeline.
Preferably, the speed measuring mechanism further comprises a positioning block and a pitot tube pressing block; the positioning block is arranged on the linear module sliding block, and the pitot tube is horizontally arranged on the positioning block and is pressed and fixed by the pitot tube pressing block.
Preferably, the upper surface of the positioning block is provided with a positioning groove matched with the mounting end of the pitot tube.
Preferably, the linear module is provided with a travel limit switch for limiting the movement range of the linear module sliding block and preventing the pitot tube from impacting the pipe wall of the detected pipeline in the movement process.
Preferably, a control box is arranged on the rack; and a linear module motor controller is arranged in the control box and used for controlling the forward and reverse rotation of the linear module motor to realize the pushing and withdrawing of the pitot tube.
Preferably, the bottom of the frame is provided with movable casters for rapidly moving the device.
The technical scheme of the invention has the following beneficial effects:
(1) According to the invention, three linear modules with 60-degree intervals are arranged, the pitot tube is arranged on the sliding block of the linear module, and the pitot tube slides along the length direction of the linear module, so that the device can perform full-coverage measurement on radial measuring points of a circular pipeline; the accuracy of the measuring position of the pitot tube and the consistency of repeated measurement are ensured by controlling the movement of the linear module, and the accuracy of the measuring result is improved.
(2) In the invention, the upper mounting frame, the middle mounting frame and the lower mounting frame are mounted on the screw rod mechanism through the mounting frames, and the mounting frames can be adjusted in the vertical direction of the screw rod mechanism, so that the vertical heights of the upper mounting frame, the middle mounting frame and the lower mounting frame are adjusted; the upper mounting frame, the middle mounting frame and the lower mounting frame can realize the adjustment of the horizontal positions of the upper mounting frame, the middle mounting frame and the lower mounting frame relative to the pipeline to be tested by adjusting the mounting positions among the upper mounting frame, the middle mounting frame, the lower mounting frame and the mounting frames; the wind speed measurement is convenient for pipelines with different pipe diameters and different height positions.
(3) According to the invention, the positioning block is provided with the positioning groove matched with the interface end of the Pitot tube, so that each Pitot tube can be ensured to be installed in place, and the influence on a measurement result caused by the installation error of the Pitot tube is prevented.
(4) According to the invention, the linear module motor controller and the touch screen are arranged in the control box, so that the movement of the linear module sliding block can be conveniently controlled, the push and the return of the pitot tube are realized, the automatic positioning of the pitot tube is realized, the intelligent operation of measurement is realized, and the workload of measurement staff is reduced.
In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of a pipe speed measuring device;
FIG. 2 is a diagram of a flow measurement point arrangement within a circular pipe;
FIG. 3 is a schematic view of the mounting structure;
FIG. 4 is a schematic view of the structure of the upper mounting ramp;
FIG. 5 is a schematic view of the structure of the middle mounting plate;
FIG. 6 is a schematic view of the lower mounting ramp;
FIG. 7 is a schematic diagram of the use of a pitot tube in combination with a locating block.
The device comprises a frame 1, a frame 11, a screw rod mechanism 12, an upper mounting frame 121, an upper mounting inclined frame 13, a middle mounting frame 131, a middle mounting plate 14, a lower mounting frame 141, a lower mounting inclined frame 15, a mounting frame 16, a fixing nut 17, a control box 2, a speed measuring mechanism 21, a pitot tube 22, a linear module 221, a travel limit switch 23, a positioning block 24, a pitot tube pressing block 3 and a measured pipeline.
Detailed Description
Embodiments of the invention are described in detail below with reference to the attached drawings, but the invention can be implemented in a number of different ways, which are defined and covered by the claims.
Referring to fig. 1 to 7, a pipe speed measuring device is provided, and the embodiment is applied to circular pipe speed measurement.
A pipeline speed measuring device comprises a frame 1 and three speed measuring mechanisms 2 which are sequentially arranged on the frame 1 along the height direction;
Referring to fig. 1, the tachometer mechanism 2 comprises a pitot tube 21 and a linear module 22; the three linear modules 22 are distributed in an angle mode, the length directions of the three linear modules 22 extend to cross the circle center of the measured pipeline 3, a standard L-shaped Pitot tube 21 is mounted on each linear module 22 sliding block, the Pitot tube 21 can conduct linear motion along the length direction of the linear modules 22, the speed measuring end of the Pitot tube 21 is opposite to the fluid direction, wind speeds of different pipe diameter positions of the measured pipeline 3 are measured, and the coverage of measuring points of all areas in the measured pipeline 3 shown in FIG. 2 is achieved.
The common linear module 22 is provided with a synchronous belt type and a screw rod type, a sliding block is arranged on a belt or the screw rod of the linear module 22, and driven by a motor, the sliding block can do linear reciprocating motion along with the belt or do linear reciprocating motion on the screw rod; the bottom of the linear module 22 is provided with a T-shaped groove and is provided with a nut for realizing the installation of the linear module 22.
Referring to fig. 1, the frame 1 includes a screw mechanism 11, and an upper mounting frame 12, a middle mounting frame 13, and a lower mounting frame 14 sequentially disposed in a height direction of the screw mechanism 11; three said linear modules 22 are mounted on the upper mounting frame 12, the middle mounting frame 13 and the lower mounting frame 14, respectively; the two adjacent linear modules 22 are spaced by 60 degrees, and the length direction of the linear module 22 at the middle position is parallel to the horizontal plane.
Referring to fig. 1, 3 and 4, in this embodiment, the upper mounting frame 12 includes a mounting frame 15 and an upper mounting bracket 121, the upper mounting bracket 121 is mounted on the mounting frame 15, and the linear module 22 is mounted on a linear module mounting surface on which the upper mounting bracket 121 is inclined; the included angle between the linear module installation surface of the upper installation inclined frame 121 and the installation frame installation surface is 60 degrees.
Referring to fig. 1, 3 and 5, in the present embodiment, the middle mounting frame 13 includes a mounting frame 15 and a middle mounting plate 131, the middle mounting plate 131 is mounted on the mounting frame 15, and the linear module 22 is horizontally mounted on a linear module mounting surface of the middle mounting plate 131.
Referring to fig. 1, 3 and 6, in this embodiment, the lower mounting rack 14 includes a mounting rack 15 and a lower mounting inclined rack 141, the lower mounting inclined rack 141 is hoisted on the mounting rack 15, and the linear module 22 is mounted on a linear module mounting surface on which the lower mounting inclined rack 141 is inclined; the included angle between the installation frame installation surface of the lower installation inclined frame 141 and the straight line module installation surface is 60 degrees.
Referring to fig. 4 to 6, kidney-shaped holes are provided on the linear module mounting surfaces of the upper mounting bracket 121, the middle mounting bracket 131 and the lower mounting bracket 141 for mounting the linear modules 22 and performing position adjustment so that the positions of the three linear modules 22 meet the requirements.
Referring to fig. 1, three of the mounting frames 15 are mounted on the screw mechanism 11 in sequence in the height direction; the connection part of the mounting frame 15 and the screw rod mechanism 11 is provided with a pair of fixing nuts 16, and the fixing nuts 16 are respectively positioned on the upper surface and the lower surface of the connection part of the mounting frame 15 and the screw rod and used for adjusting and fixing the height positions of the upper mounting frame 12, the middle mounting frame 13 and the lower mounting frame 14; when the position of the mounting frame 15 is required to be adjusted, the fixing nut 16 on the upper side of the mounting frame 15 is loosened to a proper position when the position of the mounting frame 15 is adjusted upwards, the mounting frame 15 is lifted, and then the fixing nut 16 on the other side of the mounting frame 15 is rotated to realize the lifting of the mounting frame 15; when descending, firstly loosening the fixing nut 16 at the lower side of the mounting frame 15 to a proper position, putting down the mounting frame 15, and then rotating the fixing nut 16 at the other side of the mounting frame 15 to realize the descending of the mounting frame 15; the linear bearing is arranged at the joint of the mounting frame 15 and the polished rod of the screw rod mechanism 11, so that the vertical movement of the mounting frame 15 along the screw rod mechanism 11 is smoother.
Referring to fig. 3, the mounting frame 15 is provided with kidney-shaped holes along the length direction for adjusting the mounting positions of the upper mounting bracket 121, the middle mounting plate 131 and the lower mounting bracket 141, thereby adjusting the horizontal distances of the upper mounting frame 12, the middle mounting frame 13 and the lower mounting frame 14 with respect to the pipe 3 to be tested.
Referring to fig. 1, the tachometer mechanism 2 further comprises a locating block 23 and a pitot tube press block 24; the positioning block 23 is mounted on a slide block of the linear module 22, the pitot tube 21 is horizontally placed on the positioning block 23, and is pressed and fixed by the pitot tube pressing block 24.
The common pitot tube 21 interface end forms have a cross shape, a T shape and a Y shape, the upper surface of the positioning block 23 is provided with a positioning groove matched with the mounting end (i.e. the interface end) of the pitot tube 21, the positioning groove structure can be set to be the cross shape, the T shape or the Y shape according to the structure of the pitot tube 21, see fig. 7, in this embodiment, the pitot tube 21 with the cross-shaped interface end is used, and the positioning block 23 is provided with a cross-shaped positioning groove for ensuring that the pitot tube 21 is mounted in place.
Referring to fig. 1, the linear module 22 is provided with a travel limit switch 221 for limiting the movement range of the slider of the linear module 22, so as to prevent the pitot tube 21 from striking the wall of the pipe 3 to be tested during the movement process, so as not to damage the pitot tube 21 and affect the wind speed measurement result.
Referring to fig. 1, a control box 17 is arranged on the frame 1; the control box 17 is internally provided with a device power supply, a programmable logic controller, a linear module motor controller and a touch screen, the linear module motor controller is used for controlling the forward and reverse rotation of a linear module 22 motor, the push and the return of the pitot tube 21 are realized through the movement of a sliding block, and the programmable logic controller generates the position information of the measuring point in the pipeline through the diameter size of the detected pipeline 3 and the diameter size of the pitot tube 21.
Referring to fig. 1, the bottom of the frame 1 is provided with movable casters for rapidly moving the device.
The using method of the pipeline speed measuring device comprises the following steps:
Step one: installing the linear module 22, the upper mounting frame 12, the middle mounting frame 13 and the lower mounting frame 14 and adjusting positions;
Step two: a measuring hole with a diameter 1-2 mm larger than that of the Pitot tube 21 is formed in the wall of the measured pipeline 3, three Pitot tube 21 measuring ends extend into the measuring hole of the measured pipeline 3, after the direction is adjusted, the interface end of the Pitot tube 21 is mounted on a positioning block 23 of a corresponding linear module 22 and is pressed, and the Pitot tube 21 is connected to a wind speed data acquisition device;
Step three: pushing the sliding block of the linear module 22 to enable the pitot tube 21 to be just contacted with the inner wall of the detected pipeline 3, correspondingly adjusting the two travel limit switches 221 on the linear module 22, and preventing the pitot tube 21 from impacting the pipe wall of the detected pipeline 3 during subsequent operation.
Step four: the device is electrified, the diameter of the detected pipeline 3 and the diameter of the Pitot tube 21 are input on a touch screen of the control box 17, measuring point position information is generated, and wind speed measurement is carried out on each measuring point.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The pipeline speed measuring device is characterized by comprising a frame (1) and three speed measuring mechanisms (2) which are sequentially arranged on the frame (1) along the height direction;
The speed measuring mechanism (2) comprises a Pitot tube (21) and a linear module (22); the three linear modules (22) are distributed in an angle; the length directions of the three linear modules (22) extend to cross the center of a circle of a measured pipeline, a pitot tube (21) is arranged on a sliding block of each linear module (22), the pitot tube (21) can do linear motion along the length direction of the linear module (22), wind speeds of different pipe diameter positions of the measured pipeline are measured, and the coverage of measuring points of all areas in the measured pipeline is realized;
The frame (1) comprises a screw rod mechanism (11) and an upper mounting frame (12), a middle mounting frame (13) and a lower mounting frame (14) which are sequentially arranged along the height direction of the screw rod mechanism (11); the three linear modules (22) are respectively arranged on the upper mounting frame (12), the middle mounting frame (13) and the lower mounting frame (14), the two adjacent linear modules (22) are spaced by 60 degrees, and the length direction of the linear module (22) at the middle position is parallel to the horizontal plane;
The upper mounting frame (12), the middle mounting frame (13) and the lower mounting frame (14) comprise detachable mounting frames (15); the three mounting frames (15) are sequentially arranged on the screw rod mechanism (11) along the height direction;
The connection part of the mounting frame (15) and the screw rod mechanism (11) is provided with a pair of fixing nuts (16) for adjusting and fixing the height positions of the upper mounting frame (12), the middle mounting frame (13) and the lower mounting frame (14);
the mounting frame (15) is provided with waist-shaped holes along the length direction for adjusting the horizontal distance between the upper mounting frame (12), the middle mounting frame (13) and the lower mounting frame (14) relative to the detected pipeline;
The speed measuring mechanism (2) further comprises a positioning block (23) and a pitot tube pressing block (24); the positioning block (23) is arranged on a slide block of the linear module (22), and the pitot tube (21) is horizontally arranged on the positioning block (23) and is pressed and fixed by a pitot tube pressing block (24);
the upper surface of the positioning block (23) is provided with a positioning groove matched with the mounting end of the pitot tube (21);
The upper mounting frame (12) further comprises an upper mounting inclined frame (121), the upper mounting inclined frame (121) is mounted on the mounting frame (15), and the linear module (22) is mounted on a linear module mounting surface on which the upper mounting inclined frame (121) is obliquely arranged; the included angle between the linear module installation surface of the upper installation inclined frame (121) and the installation surface of the installation frame is 60 degrees;
The middle mounting frame (13) further comprises a middle mounting plate (131), the middle mounting plate (131) is mounted on the mounting frame (15), and the linear module (22) is horizontally mounted on a linear module mounting surface of the middle mounting plate (131);
the lower mounting frame (14) further comprises a lower mounting inclined frame (141), the lower mounting inclined frame (141) is hoisted on the mounting frame (15), and the linear module (22) is mounted on a linear module mounting surface on which the lower mounting inclined frame (141) is obliquely arranged; the included angle between the installation frame installation surface of the lower installation inclined frame (141) and the straight line module installation surface is 60 degrees.
2. The device for measuring the speed of the pipeline according to claim 1, wherein the linear module (22) is provided with a travel limit switch (221) for limiting the movement range of the sliding block of the linear module (22) and preventing the pitot tube (21) from striking the wall of the pipeline to be measured in the movement process.
3. A pipeline speed measuring device according to claim 1, characterized in that the frame (1) is provided with a control box (17); the control box (17) is internally provided with a linear module motor controller which is used for controlling the forward and reverse rotation of a linear module (22) motor to realize the pushing and the withdrawing of the pitot tube (21).
4. A pipe speed measuring device according to claim 1, characterized in that the bottom of the frame (1) is provided with movable casters for quick movement of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911241034.9A CN110763867B (en) | 2019-12-06 | 2019-12-06 | Pipeline speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911241034.9A CN110763867B (en) | 2019-12-06 | 2019-12-06 | Pipeline speed measuring device |
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| Publication Number | Publication Date |
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| CN110763867A CN110763867A (en) | 2020-02-07 |
| CN110763867B true CN110763867B (en) | 2024-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911241034.9A Active CN110763867B (en) | 2019-12-06 | 2019-12-06 | Pipeline speed measuring device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113281532A (en) * | 2021-06-16 | 2021-08-20 | 中国船舶工业集团公司第七0八研究所 | Pitot tube convenient for angle adjustment in pipeline and flow velocity measuring method thereof |
| GB2610760B (en) * | 2021-11-17 | 2024-02-28 | Univ Jiangsu | Pressure testing machine for fluid in cavitation generator and testing method using same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210720457U (en) * | 2019-12-06 | 2020-06-09 | 湖南联诚轨道装备有限公司 | Pipeline speed measuring device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2022234C1 (en) * | 1992-08-04 | 1994-10-30 | Николай Иванович Пучков | Device to measure flow rate of working media in pipe-lines |
| CN202850473U (en) * | 2012-10-26 | 2013-04-03 | 北京建工博海建设有限公司 | Triangle supporting frame platform |
| CN204639694U (en) * | 2015-05-19 | 2015-09-16 | 中达电机股份有限公司 | Electric machine stand drilling on inclined surface special tool is shelved |
| CN206409816U (en) * | 2017-01-13 | 2017-08-15 | 温州大学 | A kind of variable diameter straight tube road adaptive robot |
| US10551403B2 (en) * | 2017-06-26 | 2020-02-04 | Dwyer Instruments, Inc. | Pitot tube instrument |
| CN109696558A (en) * | 2018-05-11 | 2019-04-30 | 中电华创电力技术研究有限公司 | It is a kind of for measuring the portable rack of pipeline fluid velocity inside |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210720457U (en) * | 2019-12-06 | 2020-06-09 | 湖南联诚轨道装备有限公司 | Pipeline speed measuring device |
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