A microgauge

Abstract

The application discloses a micro measurement meter, and relates to the technical field of sensors, which comprises a pipeline channel group and a sensor group; the pipeline channel group comprises a first pipeline and a second pipeline; the second pipeline is connected in series in the first pipeline, and the cross-sectional area of the second pipeline is smaller than that of the first pipeline; the sensor group comprises a first pressure sensor and a second pressure sensor; the first pressure sensor is connected with the first pipeline and used for measuring the pressure in the first pipeline; and the second pressure sensor is connected with the second pipeline and used for measuring the pressure in the second pipeline. The micro measurement meter designed in the application can realize smaller range measurement effect and is suitable for the scene with extremely slow flow rate in the microfluidic field.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a micro-measuring instrument. Background Technology

[0002] In modern industry and scientific research, accurate measurement of fluid or gas flow rate / velocity is crucial. Traditional gas flow meters, such as glass rotor flow meters, while widely used in some applications, are typically designed to measure large gas flow rates and have some inherent limitations. For example, glass rotor flow meters usually have a large range, with a minimum range of approximately 6 mL / min, making them unsuitable for accurately measuring minute flow rates (typically around 10 μL / min for small gases). Furthermore, because their readings rely on human observation, they are susceptible to observer error. Machining and assembly tolerances in the glass tube and beads further reduce measurement accuracy.

[0003] While thermal flow meters offer a different measurement principle, they also face the problem of excessively large measurement ranges, with a minimum range of approximately 20 mL / min, which is also unsuitable for the small gas flow rates commonly found in microfluidics.

[0004] Therefore, with the development of microfluidic technology, the demand for gas flow meters capable of accurately measuring extremely low flow rates is increasing. These flow meters need to have smaller ranges and higher accuracy to meet the requirements of precise control and monitoring of gas / fluid flow rates in microfluidic systems. Developing new measuring instruments capable of providing measurements with smaller ranges is of great significance for promoting the application of microfluidic technology in fields such as biomedicine, chemical analysis, and industrial process control. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a micro-measuring instrument that can provide measurements with a smaller range.

[0006] To achieve the above technical objectives, this application provides a micro-measurement meter, including a pipeline channel assembly and a sensor assembly;

[0007] The pipeline channel group includes a first pipeline and a second pipeline;

[0008] The second pipeline is connected in series with the first pipeline, and its cross-sectional area is smaller than that of the first pipeline;

[0009] The sensor group includes a first pressure sensor and a second pressure sensor;

[0010] The first pressure sensor is connected to the first pipeline and is used to measure the pressure in the first pipeline;

[0011] The second pressure sensor is connected to the second pipeline and is used to measure the pressure in the second pipeline.

[0012] Furthermore, the second pipeline is a tee pipe, with its first connecting end and second connecting end connected in series in the first pipeline;

[0013] The third connection end of the second pipeline is connected to the second pressure sensor.

[0014] Furthermore, the second conduit is the flow channel of the microfluidic chip.

[0015] Furthermore, the first pressure sensor and the second pressure sensor are pneumatic sensors or hydraulic sensors.

[0016] Furthermore, the second pipeline is connected in series with the first pipeline via a connector.

[0017] Furthermore, the connector is a connecting pipe with an inner diameter that gradually increases from one end to the other.

[0018] One end of the connector is connected to the second pipeline, and the other end is connected to the first pipeline.

[0019] Furthermore, one end of the connector is plugged into the second pipeline.

[0020] Furthermore, the other end of the connector is connected to the first pipeline via a joint.

[0021] As can be seen from the above technical solutions, the micro-measuring instrument designed in this application has the following beneficial effects:

[0022] By connecting a second, smaller-section conduit in series with the first conduit, the conduit cross-sectional area is reduced, accelerating the extremely slow-flowing gas / fluid to a very high velocity. Using Bernoulli's principle, the pressure reduction effect caused by the increased velocity becomes clearly measurable. By comparing the pressure in the second conduit (microfluidic conduit) with the pressure in the first conduit (conventional conduit), the gas / fluid velocity and flow rate can be calculated. This achieves a smaller measurement range and is applicable to extremely slow-flowing scenarios in microfluidics, promoting the further application of microfluidics technology in biomedicine, chemical analysis, and industrial process control. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a micrometer provided in this application;

[0025] In the diagram: 11, first pipeline; 12, second pipeline; 21, first pressure sensor; 22, second pressure sensor. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the embodiments of this application.

[0027] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a replaceable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] This application discloses a micrometer.

[0030] Please see Figure 1 One embodiment of a micro-measuring instrument provided in this application includes:

[0031] Pipeline channel group and sensor group.

[0032] The pipeline channel assembly includes a first pipeline 11 and a second pipeline 12. The second pipeline 12 is connected in series with the first pipeline 11, and its cross-sectional area is smaller than that of the first pipeline 11, thus reducing the gas passage area. The second pipeline 12, as a microfluidic pipeline, can have a cross-sectional area S2 that can be... The first pipeline 11 is a conventional pipeline, and its cross-sectional area S1 can be... For example, the ratio between S2 and S1 ranges from 1 / 10000 to 1 / 30000. Of course, the cross-sectional areas of the two can be designed to vary according to actual needs.

[0033] The sensor group includes a first pressure sensor 21 and a second pressure sensor 22; the first pressure sensor 21 is connected to the first pipeline 11 and is used to measure the pressure in the first pipeline 11; the second pressure sensor 22 is connected to the second pipeline 12 and is used to measure the pressure in the second pipeline 12.

[0034] The micro-measuring instrument designed in this application has the following beneficial effects:

[0035] By connecting a smaller cross-sectional area second conduit 12 in series with the first conduit 11, the cross-sectional area of ​​the conduit is reduced, accelerating the extremely slow-flowing gas / fluid to an extremely high velocity. Using Bernoulli's principle, the pressure reduction effect caused by the increased velocity becomes clearly measurable. By comparing the pressure in the second conduit 12 (microfluidic conduit) with the pressure in the first conduit 11 (conventional conduit), the gas / fluid velocity and flow rate can be calculated. This achieves a smaller measurement range and is applicable to extremely slow-flowing scenarios in microfluidics, promoting the further application of microfluidics technology in biomedicine, chemical analysis, and industrial process control.

[0036] Regarding the calculation of gas flow velocity, due to the compressibility of gases and other factors, the calculation of velocity / flow rate requires solving a system of equations using numerical methods. Specifically, engineering calculation software (such as MATLAB, Python SciPy) or computational fluid dynamics (CFD) software is used to execute iterative algorithms, ultimately finding a numerical solution that satisfies all physical laws, and the flow rate / velocity can then be calculated.

[0037] When the application object is an incompressible liquid, the calculation is as follows:

[0038] Consider an incompressible fluid flowing from a larger cross-sectional area S1 into a narrower cross-sectional area S2, with its velocity increasing from V1 to V2 and its pressure decreasing from P1 to P2. The fluid density is... ,but

[0039]

[0040] Since S1 is much larger than S2,

[0041] The above is an embodiment of a micro-measuring instrument provided in this application. The following is an embodiment of a micro-measuring instrument provided in this application. Please refer to the following for details. Figure 1 .

[0042] Based on the solution of Embodiment 1 above:

[0043] Furthermore, the second conduit 12 is a tee pipe (a capillary tube of a tee), with its first and second connecting ends connected in series in the first conduit 11; the third connecting end of the second conduit 12 is connected to the second pressure sensor 22. The use of a tee pipe makes the introduction of the second conduit 12 more flexible, adaptable to different layouts and installation space requirements. At the same time, the direct connection of the third connecting end to the second pressure sensor 22 ensures the accuracy and stability of the measurement.

[0044] Furthermore, the second conduit 12 is the flow channel for the microfluidic chip.

[0045] The flow channel of the microfluidic chip, serving as the second conduit 12, enables further miniaturization of the measurement device, improving measurement accuracy and sensitivity. Microfluidic chip technology, with its advantages of high integration, low sample consumption, and fast analysis speed, demonstrates enormous application potential in fields such as biomedicine, environmental monitoring, and drug screening. Applying the microfluidic chip flow channel to the micro-measurement meter of this application not only enables measurements with smaller ranges but also promotes the application and development of microfluidics technology in more fields.

[0046] Furthermore, the first pressure sensor 21 and the second pressure sensor 22 are either pneumatic or hydraulic sensors. The choice of pneumatic or hydraulic sensors allows the micro-measuring instrument of this application to be applicable to the measurement needs of different media (gas or liquid). At the same time, both types of sensors have advantages such as high measurement accuracy, good stability, and fast response speed, ensuring the accuracy and reliability of the measurement. Regarding the pneumatic sensor, it can be, for example, a Honeywell HSCMRRN060PDSA3 model pneumatic sensor; the specific design can be varied according to actual use and is not limited.

[0047] Furthermore, the second pipeline 12 is connected in series with the first pipeline 11 via a connector (not shown in the figure).

[0048] Furthermore, the connector is a connecting tube with an inner diameter that gradually increases from one end to the other (e.g., a tapered fused silica capillary or a precision metal capillary); one end (micro end) of the connector is connected to the second conduit 12, and the other end (large end) is connected to the first conduit 11.

[0049] Furthermore, one end of the connector is plugged into the second conduit 12. Specifically, one end of the second conduit 12 is carefully inserted into one end (micro-end) of the connector, and then precisely bonded and sealed under a microscope using high-precision epoxy resin adhesive or UV-cured adhesive. This plug-in connection ensures a tight connection between the second conduit 12 and the connector, preventing gas / fluid leakage and guaranteeing measurement accuracy. At the same time, the plug-in connection simplifies the assembly process and improves production efficiency.

[0050] Furthermore, the other end of the connector is connected to the first conduit 11 via a fitting. Specifically, the other end (large end) of the connector is connected to one end of the first conduit 11 via a standard fitting. The use of a fitting makes the connection between the connector and the first conduit 11 more secure and reliable, while also facilitating disassembly and maintenance. The specific type and specifications of the fitting can be selected according to actual needs (such as compression fittings or quick-connect fittings) to adapt to different application scenarios and measurement requirements.

[0051] The above provides a detailed description of a micro-measuring instrument provided in this application. For those skilled in the art, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A micro-measuring instrument, characterized in that, This includes pipeline channels and sensor arrays; The pipeline channel group includes a first pipeline (11) and a second pipeline (12); The second pipe (12) is connected in series with the first pipe (11), and its cross-sectional area is smaller than that of the first pipe (11); The sensor group includes a first pressure sensor (21) and a second pressure sensor (22); The first pressure sensor (21) is connected to the first pipeline (11) and is used to measure the pressure in the first pipeline (11); The second pressure sensor (22) is connected to the second pipeline (12) and is used to measure the pressure in the second pipeline (12).

2. The micro-measuring instrument according to claim 1, characterized in that, The second pipe (12) is a tee pipe, and its first connecting end and second connecting end are connected in series in the first pipe (11); The third connection end of the second pipeline (12) is connected to the second pressure sensor (22).

3. A micro-measuring instrument according to claim 1, characterized in that, The second conduit (12) is the flow channel of the microfluidic chip.

4. A micro-measuring instrument according to claim 1, characterized in that, The first pressure sensor (21) and the second pressure sensor (22) are either pneumatic or hydraulic sensors.

5. A micro-measuring instrument according to claim 1, characterized in that, The second pipeline (12) is connected in series with the first pipeline (11) via a connector.

6. A micro-measuring instrument according to claim 5, characterized in that, The connector is a connecting pipe with an inner diameter that gradually increases from one end to the other. One end of the connector is connected to the second pipe (12), and the other end is connected to the first pipe (11).

7. A micro-measuring instrument according to claim 6, characterized in that, One end of the connector is plugged into the second pipeline (12).

8. A micro-measuring instrument according to claim 6, characterized in that, The other end of the connector is connected to the first pipeline (11) via a joint.

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