Dryness sensor, sensor implementation method and measurement system

Abstract

The invention discloses a dryness sensor, a sensor implementation method and a measurement system.The sensor is used for measuring the dryness of target fluid in a target pipeline and comprises a temperature sensor, a receiving electrode, an excitation electrode and a measurement module; the receiving electrode is a hollow tube; the diameter of the hollow pipe is smaller than that of the target pipeline; the exciting electrode and the temperature sensor are arranged in the hollow tube; the exciting electrode is connected with the temperature sensor; and the temperature sensor, the exciting electrode and the receiving electrode are connected with the measuring module. The sensor can be widely applied to the technical field of sensors.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a dryness sensor, a sensor implementation method, and a measurement system. Background Art

[0002] Traditional methods for measuring dryness are generally heat balance method and separation method. The heat balance method calculates dryness by calculating the specific enthalpy of two-phase flow. The disadvantage is that there must be a section of single-phase flow and the system modification is complicated. The separation method separates the gas and liquid phases and measures the flow separately before calculating the dryness.

[0003] In the related art, a hygrometer and humidity measurement method based on capacitance measurement are proposed, and the publication number is CN118362613A. The hygrometer can use a grounded pipe as an electrode to measure the capacitance between the pipe and the electrode when the fluid passes through the pipe, and calculate the humidity of the fluid through the capacitance. However, since the pipe of this hygrometer is used as a receiving electrode and is grounded, the measurement results for different pipes will be affected by the different grounding resistances of the pipes, resulting in a decrease in the measurement accuracy of the sensor. Therefore, there are still technical problems that need to be solved in the related art. Summary of the invention

[0004] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0005] To this end, an object of an embodiment of the present application is to provide a dryness sensor, a sensor implementation method and a measurement system, which can improve measurement accuracy.

[0006] In order to achieve the above-mentioned technical objectives, the technical solution adopted in the embodiments of the present application includes: a dryness sensor, which is used to measure the dryness of a target fluid in a target pipe, and the sensor includes: a temperature sensor, a receiving electrode, an excitation electrode, and a measurement module; the receiving electrode is a hollow tube; the diameter of the hollow tube is smaller than that of the target pipe; the excitation electrode and the temperature sensor are both arranged in the hollow tube; the excitation electrode is connected to the temperature sensor; the temperature sensor, the excitation electrode and the receiving electrode are connected to the measurement module.

[0007] In addition, a dryness sensor according to the above embodiment of the present invention may also have the following additional technical features: Furthermore, in the embodiment of the present application, a plurality of conducting holes are provided on the hollow tube.

[0008] Furthermore, in an embodiment of the present application, the sensor also includes an external thread and an installation tool; the installation tool and the external thread are arranged on a side opposite to the temperature sensor; the installation tool includes an internal thread; the internal thread is cooperatively connected with the external thread; the installation tool is used to fix the dryness sensor in the target pipe.

[0009] Furthermore, in an embodiment of the present application, the installation tool also includes a first thread; the target pipeline includes a second thread; and the first thread is cooperatively connected with the second thread.

[0010] Furthermore, in an embodiment of the present application, the measurement module specifically includes a dielectric constant processing chip and a processor; the dielectric constant processing chip and the temperature sensor are connected to the processor.

[0011] Furthermore, in an embodiment of the present application, the target pipeline includes one or more right-angle pipelines.

[0012] Furthermore, in an embodiment of the present application, the target pipeline is grounded.

[0013] On the other hand, an embodiment of the present application further provides a dryness sensor application method, including: Placing the dryness sensor described in any of the above items on a right-angle pipe of the target pipe, so that the target fluid passes through the dryness sensor; When the target fluid flows through the receiving electrode, the excitation electrode and the temperature sensor, the excitation electrode and the receiving electrode generate a changed target dielectric constant which is captured by the measurement module. At the same time, the temperature sensor detects the target temperature of the target fluid and sends it to the measurement module. The measurement module obtains the dryness of the target fluid based on the target dielectric constant and the target temperature.

[0014] Further, in the embodiment of the present application, obtaining the dryness of the target fluid according to the target dielectric constant and the target temperature includes: The measurement module inputs the target dielectric constant and the target temperature into a first calculation formula to obtain the dryness of the target fluid; wherein the first calculation formula is: Where X is the dryness, is the dryness bias constant, , , , , , are the dryness curve constants, C is the target dielectric constant, and T is the target temperature.

[0015] In addition, the present application also provides a pipeline measurement system, comprising the dryness sensor described in any of the above items.

[0016] The advantages and benefits of the present application will be partially given in the following description, and partially become apparent from the following description, or be understood through the practice of the present application: The present application adds a receiving electrode of a hollow tube with a diameter smaller than that of the target pipe to the traditional sensor, and at the same time, the excitation electrode and the temperature sensor are both arranged in the receiving electrode of the hollow tube, so that the target fluid in the target pipe can flow through the two electrodes while avoiding the reduction of measurement accuracy due to the receiving electrode being grounded in contact with the pipe. Compared with the existing sensors, the present application is more convenient to use and has higher measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a dryness sensor in a specific embodiment of the present invention; Figure 2 A schematic diagram of the steps of a method for applying a dryness sensor in a specific embodiment of the present invention; Figure 3 It is a schematic diagram of the installation of a dryness sensor in a specific embodiment of the present invention; Figure 4 It is a structural schematic diagram of an existing sensor and a sensor of the present application in a specific embodiment of the present invention; Figure 5 It is a schematic diagram of three installation methods of sensors and installation tools in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings to illustrate the principles and processes of the dryness sensor, sensor implementation method and measurement system in the embodiments of the present invention.

[0019] The present application provides a dryness sensor. The sensor can measure the dryness of a target fluid in a target pipe. The target pipe can be a grounded metal pipe, which can form a shield internally to protect the internal measurement from the influence of the external environment and improve the measurement accuracy of the sensor. The target pipe can have one or more straight and right-angle pipes. Figure 1, the dryness sensor may include a temperature sensor 1, a receiving electrode 2, an excitation electrode 3, and a measuring module 4. Among them, the receiving electrode 2 may be a hollow tube. In order to facilitate the setting in the target pipe and avoid contact with the inner wall of the pipe, the diameter of the hollow tube is smaller than the target pipe. Specifically, the diameter of the hollow tube may be smaller than the inner diameter of the target pipe. The excitation electrode 3 and the temperature sensor 1 may both be set in the hollow tube. When there is no fluid, the excitation electrode 3 may form a capacitor with the receiving electrode 2 with an air medium. The excitation electrode 3 is connected to the temperature sensor 1. The connection may be a physical connection. That is, the excitation electrode 3 may be connected to the temperature sensor 1 through a hollow metal tube or other firmware, and when connected through a hollow metal tube, the hollow metal tube may also be the excitation electrode 3 itself. When the hollow metal tube is the excitation electrode 3, the temperature sensor 1 may be placed at one end of the metal tube away from the measuring module 4. Placing it at the end away from the measuring module 4 is conducive to heat transfer and more accurate temperature measurement. At this time, the top of the metal tube may be sealed with the temperature sensor 1. The temperature sensor 1 may also be placed inside the metal tube. At this time, the sensor may not be sealed with the excitation electrode 3. The temperature sensor 1 may also be attached to the outer wall of the metal pipe. In this case, the temperature sensor 1 does not need to be sealed with the excitation electrode 3. The temperature sensor 1, the excitation electrode 3 and the receiving electrode 2 are electrically connected to the measurement module 4.

[0020] In summary, this embodiment adds a receiving electrode of a hollow tube with a diameter smaller than that of the target pipe to the traditional sensor, and at the same time, the excitation electrode and the temperature sensor are both arranged in the receiving electrode of the hollow tube, so that the target fluid in the target pipe can flow through the two electrodes while avoiding the receiving electrode from being grounded due to contact with the pipe, which reduces the measurement accuracy. Compared with the existing sensors, this embodiment has higher measurement accuracy, and the present application can avoid the on-site calibration procedure. The design of the related technology needs to be calibrated on-site after installation, and it is necessary to consider the impact of the voltage or resistance to ground on our test, which makes the calibration cumbersome. Now it can be calibrated at the factory, and the resistance to ground of the on-site pipeline does not affect the test results of this application.

[0021] Furthermore, in the embodiment of the present application, the target pipeline may include one or more right-angle pipelines. The fluid in the right-angle pipeline can have better fluidity, so that the characteristics of the fluid can be accurately fed back, making the measurement of the sensor more accurate.

[0022] Furthermore, in the embodiment of the present application, a plurality of conducting holes may be provided on the hollow tube. Providing the conducting holes enables the sensor to be disposed on a right-angled pipe of the target pipe, and the target fluid can flow through the conducting holes in the pipe, while increasing the contact area between the fluid and the receiving electrode, minimizing the disturbance of the sensor to the fluid, and improving the test accuracy. This embodiment can conduct the space to improve the test accuracy of the sensor while enabling the sensor to be applied to more scenarios, thereby improving the practicality of the sensor.

[0023] Furthermore, in the embodiment of the present application, the sensor also includes an external thread and a mounting fixture; the mounting fixture and the external thread are arranged on the side opposite to the temperature sensor; the mounting fixture includes an internal thread; the internal thread is connected with the external thread; the mounting fixture is used to fix the dryness sensor in the target pipe. The thread design adopted in this embodiment can better fix the sensor in the target pipe with internal thread, and at the same time can have a better sealing effect to prevent fluid leakage from the sensor installation. Specifically, refer to Figure 5 , Figure 5 It is a schematic diagram of the assembly process of the sensor of the present application. It can be assembled by relying on the external thread on the sensor and the internal thread of the installation tool, and there are three sealing methods.

[0024] 1. Wrap the Teflon raw tape around the external thread and then screw it into the internal thread. Since the Teflon raw tape has plasticity, it can fill the gap between the internal and external threads after tightening, thus forming a seal between the sensor and the installation tooling.

[0025] 2. An O-type gasket is placed on the end face of the sensor. The O-type gasket has a certain elasticity. The present application completes the extrusion of the O-type gasket through the cooperation of the external thread and the internal thread, thereby achieving sealing.

[0026] 3. By placing an O-ring on the sensor connecting shaft, after the O-ring is screwed in, the O-ring squeezes the tooling to form a seal.

[0027] Furthermore, in the embodiment of the present application, the installation tool further includes a first thread; the target pipe includes a second thread; the first thread is connected in cooperation with the second thread. The first thread can be an external thread or an internal thread, and correspondingly, the second thread can be an internal thread or an external thread. The threaded design can better fix the sensor in the target pipe with an internal thread, and at the same time can have a better sealing effect to prevent fluid leakage from the sensor installation location.

[0028] Furthermore, in the embodiment of the present application, the measurement module specifically includes a dielectric constant processing chip and a processor; the dielectric constant processing chip and the temperature sensor are connected to the processor.

[0029] Furthermore, in the embodiment of the present application, the target pipeline can be grounded. The grounded target pipeline can shield the interference of external factors on the accuracy of the sensor, thereby improving the measurement accuracy of the sensor.

[0030] On the other hand, refer to Figure 2 as well as Figure 3 The present application also provides a method for applying a dryness sensor. The method may include steps S101 and S102.

[0031] S101, placing a dryness sensor on a right-angle pipe of a target pipe, so that the target fluid passes through the dryness sensor; S102. When the target fluid flows through the receiving electrode, the excitation electrode and the temperature sensor, the excitation electrode and the receiving electrode generate a changed target dielectric constant and are captured by the measuring module. At the same time, the temperature sensor detects the target temperature of the target fluid and sends it to the measuring module; the measuring module obtains the dryness of the target fluid based on the target dielectric constant and the target temperature.

[0032] In some feasible embodiments of the present application, the tester can place the dryness sensor on a right-angle pipe of the target pipe, so that the target fluid passes through the dryness sensor; when the target fluid flows through the receiving electrode, the excitation electrode and the temperature sensor, the excitation electrode and the receiving electrode produce a changing target dielectric constant and are captured by the measuring module, while the temperature sensor detects the target temperature of the target fluid and sends it to the measuring module; the measuring module obtains the dryness of the target fluid based on the target dielectric constant and the target temperature.

[0033] Furthermore, in the embodiment of the present application, the step of obtaining the dryness of the target fluid according to the target dielectric constant and the target temperature may specifically include: The measurement module inputs the target dielectric constant and the target temperature into the first calculation formula to obtain the dryness of the target fluid; wherein the first calculation formula is: Where X is the dryness, is the dryness bias constant, , , , , , are the dryness curve constants, C is the target dielectric constant, and T is the target temperature.

[0034] Understandably, , , , , , , are all constants, and they can be adjusted according to the user's actual measurement requirements. Specifically, , , , , , , It can be different according to the physical properties of the fluid tested on site, the installation method (horizontal insertion, vertical upward, vertical downward), and the pipe diameter. , , , , , , It can also be obtained by fitting experimental data.

[0035] The beneficial effects of this application are described below in conjunction with a table.

[0036] Reference Figure 4 As shown in Table 1, the designer tested the signal characteristics for the existing scheme in which the receiving electrode is in contact with the pipeline and grounded and the scheme of the present application. The test results are shown in Table 1: Serial number plan size Signal size Signal standard deviation Example 1 Receive electrode ground Excitation electrode 10mm 2.54pf 0.55pf Example 2 Receive electrode ground Excitation electrode 13mm 2.58pf 0.54pf Example 3 Receive electrode ground Excitation electrode 15mm 2.59pf 0.55pf Example 4 The receiving electrode is not grounded Excitation electrode 4mm, receiving electrode 10mm 8.79pf 0.15pf Example 5 The receiving electrode is not grounded Excitation electrode 4mm, receiving electrode 13mm 8.94pf 0.15pf Example 6 The receiving electrode is not grounded Excitation electrode 4mm, receiving electrode 16mm 9.25pf 0.17pf Table 1 In Table 1 above, the signal size is the difference between the capacitance signal of full liquid and full gas. The capacitance signal difference can also affect the measurement accuracy of the fluid dielectric constant to a certain extent. The signal standard deviation is the standard deviation of the signal fluctuation under the full gas state. It can be seen that the solution with the receiving electrode not grounded has a higher signal size and a lower signal standard deviation. Therefore, the signal resolution is higher and the error is lower.

[0037] In addition, an embodiment of the present application also provides a pipeline measurement system, which may include any of the dryness sensors described above.

[0038] The contents of the above-mentioned dryness sensor embodiment are all applicable to the present pipeline measurement system embodiment. The functions specifically implemented by the present pipeline measurement system embodiment are the same as those of the above-mentioned dryness sensor embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned dryness sensor embodiment.

[0039] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0041] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the described embodiments. Technical personnel familiar with the field may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A dryness sensor, characterized in that: The sensor is used to measure the dryness of a target fluid in a target pipeline, and the sensor comprises: A temperature sensor, a receiving electrode, an excitation electrode, and a measurement module; the receiving electrode is a hollow tube; the diameter of the hollow tube is smaller than that of the target pipe; The excitation electrode and the temperature sensor are both arranged in a hollow tube; the excitation electrode is connected to the temperature sensor; the temperature sensor, the excitation electrode and the receiving electrode are connected to the measurement module.

2. A dryness sensor according to claim 1, characterized in that: The hollow tube is provided with a plurality of conducting holes.

3. A dryness sensor according to claim 1, characterized in that: The sensor also includes an external thread and an installation tool; the installation tool and the external thread are arranged on a side opposite to the temperature sensor; the installation tool includes an internal thread; the internal thread is cooperatively connected with the external thread; the installation tool is used to fix the dryness sensor in the target pipe.

4. A dryness sensor according to claim 3, characterized in that: The installation tool also includes a first thread; the target pipeline includes a second thread; the first thread is cooperatively connected with the second thread.

5. A dryness sensor according to claim 1, characterized in that: The measurement module specifically includes a dielectric constant processing chip and a processor; the dielectric constant processing chip and the temperature sensor are connected to the processor.

6. A dryness sensor according to claim 1, characterized in that: The target pipeline includes one or more right-angle pipelines.

7. A dryness sensor according to claim 1, characterized in that: The target pipeline is grounded.

8. A method for applying a dryness sensor, characterized in that: include: Placing the dryness sensor according to any one of claims 1 to 7 on a right-angle pipe of a target pipe, so that the target fluid passes through the dryness sensor; When the target fluid flows through the receiving electrode, the excitation electrode and the temperature sensor, the excitation electrode and the receiving electrode generate a changed target dielectric constant which is captured by the measurement module. At the same time, the temperature sensor detects the target temperature of the target fluid and sends it to the measurement module. The measurement module obtains the dryness of the target fluid based on the target dielectric constant and the target temperature.

9. A dryness sensor according to claim 8, characterized in that: The step of obtaining the dryness of the target fluid according to the target dielectric constant and the target temperature includes: The measurement module inputs the target dielectric constant and the target temperature into a first calculation formula to obtain the dryness of the target fluid; wherein the first calculation formula is: Where X is the dryness, is the dryness bias constant, , , , , , are the dryness curve constants, C is the target dielectric constant, and T is the target temperature.

10. A pipeline measurement system, characterized in that: The dryness sensor comprises the dryness sensor as described in any one of claims 1 to 7.

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