CN213363896U - Micro-flow laminar flow sensor - Google Patents
Micro-flow laminar flow sensor Download PDFInfo
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- CN213363896U CN213363896U CN202022415802.2U CN202022415802U CN213363896U CN 213363896 U CN213363896 U CN 213363896U CN 202022415802 U CN202022415802 U CN 202022415802U CN 213363896 U CN213363896 U CN 213363896U
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Abstract
The invention discloses a micro-flow laminar flow sensor, which comprises a shell, a laminar flow element, a through hole baffle and a calculation module, wherein the shell is provided with a plurality of through holes; the laminar flow element is arranged in the shell and is in interference fit with the shell; the surface of the laminar flow element is provided with a groove which traverses the upper surface of the laminar flow element through which the fluid flows; the through hole baffles are respectively arranged at the front end and the rear end of the laminar flow element and are provided with through holes; the calculation module is arranged outside the shell and comprises a differential pressure sensor, a temperature sensor and a calculator; the testing ends of the differential pressure sensor, the pressure sensor and the temperature sensor penetrate through the shell, and the data ends of the differential pressure sensor, the pressure sensor and the temperature sensor are connected with the calculator. The invention solves the technical problems of small error, stable measurement result and high transportability in the prior art.
Description
Technical Field
The utility model relates to a flow measurement field, in particular to micro-flow laminar flow sensor.
Background
The laminar flow sensor is designed based on Hagen-Poiseuille Law (Hagen-Poiseuille Law) and is a measuring tool for accurately measuring small micro-flow. The laminar flow sensor in the prior art utilizes various modes to design flow elements, converts a turbulent disorder state of fluid into a laminar state, but has the problems of poor stability and low precision in actual use at different degrees. In addition, in the field of micro-flow measurement, the traditional flow sensor is hardly used under the working conditions of micro-flow and high pressure. Although some technologies can realize tiny flow measurement under high temperature and high pressure, the precision can not meet the requirements of modern manufacturing industry, and the technical problems of large error and unstable measurement exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a micro flow laminar flow sensor solves among the prior art small flow laminar flow sensor error big, measure unstable technical problem.
The utility model adopts the technical proposal that: a micro-flow laminar flow sensor comprises a shell, a laminar flow element, a through hole baffle and a calculation module;
the laminar flow element is arranged in the shell and is in interference fit with the shell; the surface of the laminar flow element is provided with a groove which traverses the upper surface of the laminar flow element through which the fluid flows;
the through hole baffles are respectively arranged at the front end and the rear end of the laminar flow element and are provided with through holes;
the calculation module is arranged outside the shell and comprises a differential pressure sensor, a temperature sensor, a pressure sensor and a calculator; the testing ends of the differential pressure sensor, the temperature sensor and the pressure sensor penetrate through the shell, and the data ends of the differential pressure sensor, the temperature sensor and the pressure sensor are connected with the calculator.
Furthermore, a testing hole is formed in the top of the shell, and the differential pressure sensor, the pressure sensor and the temperature sensor penetrate into the shell through the testing hole.
Furthermore, the through hole is formed in the middle-lower position of the through hole baffle and is positioned in the same vertical plane with the groove.
Furthermore, the distance between the through hole baffles arranged at the front end and the rear end of the laminar flow element and the laminar flow element is 0.02-5 mm.
Further, the laminar flow element and the shell are in interference fit.
Further, the groove is arranged in the middle of the upper surface.
Compared with the prior art, the micro-flow laminar flow sensor adopting the technical scheme has the advantages that: small error, stable measuring result and high portability.
Drawings
FIG. 1 is a schematic cross-sectional view of a microfluidic laminar flow sensor;
FIG. 2 is a schematic perspective view of a laminar flow element in a microfluidic laminar flow sensor;
FIG. 3 is a cross-sectional view of a laminar flow element in a microfluidic laminar flow sensor;
fig. 4 is a schematic diagram of a through-hole baffle in a microfluidic laminar flow sensor.
Detailed Description
As shown in fig. 1 to 4, a micro flow laminar flow sensor includes a housing 1, a laminar flow element 2, a through-hole baffle 8, and a calculation module 3;
the laminar flow element 2 is arranged inside the shell 1 and is in interference fit with the shell 1; the surface of the laminar flow element 2 is provided with a groove 7, and the groove 7 transversely penetrates through the upper surface of the laminar flow element 2 through which fluid flows;
the through hole baffles 8 are respectively arranged at the front end and the rear end of the laminar flow element 2, and the through hole baffles 8 are provided with through holes 9;
the calculation module 3 is arranged outside the shell 1 and comprises a pressure sensor 4, a temperature sensor 5, a differential pressure sensor 10 and a calculator 6; the testing ends of the pressure sensor 4, the differential pressure sensor 10 and the temperature sensor 5 penetrate through the shell 1, and the data ends of the pressure sensor 4, the differential pressure sensor 10 and the temperature sensor 5 are connected with the calculator 6.
It should be noted that the groove 7 and the inner wall of the through hole baffle 8 disposed in front of the laminar flow element 2 form a channel at the fluid inlet end, the groove 7 and the inner wall of the casing 1 form a channel for testing, and the groove 7 and the inner side of the through hole baffle 8 disposed in back of the laminar flow element 2 form a channel at the outlet end. The other scheme is that the groove 7 is composed of three sections of grooves arranged on three surfaces of the laminar flow element 2, the three surfaces are sequentially arranged on one surface of the laminar flow element 2 facing to the fluid direction, the laminar flow element 2 is tightly attached to one surface of the calculation module, the surface of the laminar flow element 2 departing from the fluid direction, and the grooves arranged on the 3 surfaces are connected end to form the groove 7. In fact, the fluid enters the laminar flow element 2 through the through hole 9, and then enters the channel formed by the laminar flow element 2 and the shell 1, and the channel is a laminar flow channel, and the fluid is in a laminar flow state in the channel. The main object of detection of the test ends of the pressure sensor 4 and the differential pressure sensor 10 is the fluid in the flow passage section.
Further, a testing hole is formed in the top of the shell 1, and the pressure sensor 4, the temperature sensor 5 and the differential pressure sensor 10 penetrate into the shell 1 through the testing hole. The through hole 9 is arranged at the middle lower position of the through hole baffle 8 and is positioned in the same vertical plane with the groove 7. The main purpose of the through hole 9 is to introduce a fluid into the groove 7 in order to bring the fluid into a laminar state for acquiring measurement data by means of the pressure sensor 4 and the differential pressure sensor 10. Of course, the through hole 9 is located on the same vertical plane as the groove 7 to reduce the resistance of the fluid entering the groove, but this is not the only solution, and the through hole 9 is located at other positions, as long as the purpose of introducing the fluid can be achieved, and the purpose of measurement can be achieved.
Further, the distance between the through hole baffle plates 8 arranged at the front end and the rear end of the laminar flow element 2 and the laminar flow element 2 is 0.02-5 mm. The laminar flow element 2 and the shell 1 are in interference fit. The interference fit mode has a plurality of modes, and the interference fit can be realized by adding a medium, such as a rubber sleeve or an adhesive, and the interference fit can also be realized by expanding with heat and contracting with cold or other modes. The position of the groove 7 on the surface of the laminar flow element 2 does not directly affect the measurement accuracy and results, but experiments have shown that it is easier to manufacture and install in the middle, and therefore the specific position of the surface on which the groove 7 is located is not particularly required. It can be seen from the schematic diagram that the grooves 7 are in the same vertical plane, but if they are not in the same vertical plane, they are also within the protection scope of the present invention. For example, the grooves 7 are not in a horizontal and vertical state, but have a certain slope, and the grooves of three faces are inclined lines after being expanded. Because the utility model discloses an aim at realizing the laminar flow state of low discharge, laminar flow purpose can be realized equally to this kind of example, so should be contained within the scope of protection of the utility model.
Compared with the prior art, the micro-flow laminar flow sensor adopting the technical scheme has the advantages that: small error, stable measuring result and high portability.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A micro-flow laminar flow sensor is characterized by comprising a shell (1), a laminar flow element (2), a through hole baffle (8) and a calculation module (3);
the laminar flow element (2) is arranged inside the shell (1) and is in interference fit with the shell (1); the surface of the laminar flow element (2) is provided with a groove (7), and the groove (7) transversely penetrates through the upper surface of the laminar flow element (2) through which fluid flows;
the through hole baffles (8) are respectively arranged at the front end and the rear end of the laminar flow element (2), and the through hole baffles (8) are provided with through holes (9);
the computing module (3) is arranged outside the shell (1) and comprises a pressure sensor (4), a temperature sensor (5), a differential pressure sensor (10) and a calculator (6); the pressure sensor (4) and the temperature sensor (5) and the differential pressure sensor (10) are arranged at the testing end and penetrate through the shell (1), and the data ends of the pressure sensor (4), the differential pressure sensor (10) and the temperature sensor (5) are connected with the calculator (6).
2. The microfluidic laminar flow sensor according to claim 1, characterized in that a test hole is provided at the top of the housing (1), through which the pressure sensor (4), the differential pressure sensor (10) and the temperature sensor (5) penetrate into the housing (1).
3. The microfluidic laminar flow sensor according to claim 2, wherein the through-hole (9) is provided at a position intermediate and lower than the through-hole baffle (8) and in the same vertical plane as the groove (7).
4. The micro flow laminar flow sensor according to any of claims 1, 2 or 3, characterized in that the distance between the through-hole baffles (8) provided at the front and rear ends of the laminar flow member (2) and the laminar flow member (2) is 0.02 to 5 mm.
5. The microfluidic laminar flow sensor according to claim 4, characterized in that the laminar flow element (2) is an interference fit with the housing (1).
6. The microfluidic laminar flow sensor according to claim 5, wherein the groove (7) is provided in the middle of the upper surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022415802.2U CN213363896U (en) | 2020-10-27 | 2020-10-27 | Micro-flow laminar flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022415802.2U CN213363896U (en) | 2020-10-27 | 2020-10-27 | Micro-flow laminar flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213363896U true CN213363896U (en) | 2021-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022415802.2U Active CN213363896U (en) | 2020-10-27 | 2020-10-27 | Micro-flow laminar flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213363896U (en) |
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2020
- 2020-10-27 CN CN202022415802.2U patent/CN213363896U/en active Active
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