Water content detector based on capacitance method or radio frequency admittance method
By setting an intermediate electrode plate in the moisture content meter, the electric field divergence is reduced and the electric field linearity is improved, thereby enhancing the detection accuracy.
Patent Information
- Application Number
- CN202520220286.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-02-12
AI Technical Summary
In large-diameter pipelines, when measuring the water content of gas-liquid mixtures using capacitance or radio frequency admittance methods, the electric field diverges significantly at the electrode edges, leading to reduced measurement accuracy.
In moisture content detectors using capacitance or radio frequency admittance methods, an intermediate electrode is set up to reduce electric field divergence, and the linearity of the electric field is improved through the insulating connection between the first electrode, the second electrode, and the intermediate electrode.
It enhances the linearity of the electric field between the plates and improves the accuracy of moisture content detection.
Smart Images
Figure CN223664562U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to moisture content detection technical field especially relates to a moisture content detector based on capacitance method or radio frequency admittance method. BACKGROUND
[0002] In the actual application, often need to measure the content of a single medium in the mixture of gas and liquid two kinds of medium, such as energy and chemical industry, need to measure the gas-liquid content in mixed medium, the most common liquid is water, the content of a single medium in the mixture is often measured by capacitance method or radio frequency admittance method, capacitance method or radio frequency admittance method is to utilize the difference of the dielectric constant of two kinds of medium in the mixture, the capacitance value formed between two electrodes is measured, the proportion of two kinds of medium between two electrodes is calculated, thereby the content of two kinds of medium in the mixture is determined. The field strength of the central part between two electrodes is relatively uniform, and the electric field lines are in parallel state, but the field strength of the edge part of the electrode is uneven, and the electric field lines are arc-shaped, or even diverge to the outside space of the electrode (such as shown in the figure), when the diameter of the medium flow pipeline is relatively large, in order to ensure the measurement accuracy, the distance between two electrodes also needs to be lengthened, so that the electric field will be more serious, and the electric field will diverge to the outside of the electrode, and the electric field in the nonlinear state will seriously reduce the measurement accuracy. Figure 1 Utility model content
[0003] In view of the shortage of prior art, the utility model provides a moisture content detector based on capacitance method or radio frequency admittance method, which can reduce the divergence of the electric field of the edge part of the electrode, improve the linearity of the electric field between the two plates, and further improve the accuracy of the detection result.
[0004] To achieve the above object, the utility model takes the following technical scheme:
[0005] The utility model provides a moisture content detector based on capacitance method or radio frequency admittance method, which comprises a shell, a first plate and a second plate are arranged in the shell, the first plate and the second plate are opposite, and an intermediate plate is arranged between the first plate and the second plate.
[0006] Specifically, the first plate, the second plate and the intermediate plate are insulated from each other.
[0007] Specifically, the first plate, the second plate and the intermediate plate are respectively connected with the input end of the data processing device outside the shell through signal cables.
[0008] Specifically, the first plate and the second plate are respectively connected with positive voltage and negative voltage, and the intermediate plate is not connected with electricity.
[0009] Specifically, the first and second plates are connected to positive voltages, and the intermediate plate is connected to a negative voltage, or the first and second plates are connected to negative voltages, and the intermediate plate is connected to a positive voltage.
[0010] Specifically, the intermediate electrode plate is formed by stacking a third electrode plate and a fourth electrode plate, with the third electrode plate facing the first electrode plate and the fourth electrode plate facing the second electrode plate. The first electrode plate, the second electrode plate, the third electrode plate, and the fourth electrode plate are all insulated from each other.
[0011] Specifically, the first and second plates are connected to positive and negative voltages respectively, while the third and fourth plates are not connected to electricity.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0013] This invention sets an intermediate electrode between the first and second electrodes of the moisture content meter, which shortens the distance between adjacent electrodes, reduces the divergence of the electric field between the electrodes, enhances the linearity of the electric field between the electrodes, and improves the accuracy of the moisture content meter's detection results. Attached Figure Description
[0014] Figure 1 A schematic diagram of the electric field line distribution between the two plates;
[0015] Figure 2 This is a schematic diagram of the structure of the moisture content detector of this utility model;
[0016] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;
[0017] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;
[0018] Figure 5 This is a schematic diagram of the structure of Embodiment 4 of this utility model;
[0019] Figure 6 This is a schematic diagram of a structure for detecting liquid level using capacitor plates.
[0020] Reference numerals: 1. Shell, 2. First electrode plate, 3. Second electrode plate, 4. Intermediate electrode plate, 401. Third electrode plate, 402. Fourth electrode plate. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Example 1
[0023] refer to Figure 2 This embodiment proposes a moisture content detector based on capacitance or radio frequency admittance methods, including a housing 1. A first electrode 2 and a second electrode 3 are disposed on the inner wall of the housing 1, facing each other. An intermediate electrode 4 is disposed between the first electrode 2 and the second electrode 3. An electric field is formed between the first electrode 2 and the intermediate electrode 4, and an electric field is also formed between the intermediate electrode 4 and the second electrode 3. The intermediate electrode 4 reduces the divergence of the electric field, thereby making the detection results more accurate. The first electrode 2, the second electrode 3, and the intermediate electrode 4 are mutually insulated, meaning all electrodes are mutually insulated. The intermediate electrode 4 is preferably located in the middle position between the first electrode 2 and the second electrode 3. Figure 2 The first electrode 2 is connected to a positive voltage, the second electrode 3 is connected to a negative voltage, and the middle electrode 4 is not connected to a power source. The first electrode 2, the second electrode 3, and the middle electrode 4 are respectively connected to the input terminal of the data processing device outside the housing 1 through signal cables.
[0024] Example 2
[0025] refer to Figure 4 This embodiment proposes a moisture content detector based on the capacitance method or the radio frequency admittance method. The difference between this embodiment and Embodiment 1 is that the first electrode plate 2 and the second electrode plate 3 are respectively connected to a positive voltage, and the intermediate electrode plate 4 is connected to a negative voltage.
[0026] Example 3
[0027] This embodiment proposes a moisture content detector based on the capacitance method or the radio frequency admittance method. The difference between this embodiment and Embodiment 1 is that the first electrode plate 2 and the second electrode plate 3 are respectively connected to negative voltage, and the intermediate electrode plate 4 is connected to positive voltage.
[0028] Example 4
[0029] refer to Figure 5This embodiment proposes a moisture content detector based on capacitance or radio frequency admittance method, including a housing 1. A first electrode plate 2 and a second electrode plate 3 are disposed on the inner wall of the housing 1. The first electrode plate 2 and the second electrode plate 3 are opposite to each other. An intermediate electrode plate 4 is disposed between the first electrode plate 2 and the second electrode plate 3. The intermediate electrode plate 4 is formed by stacking a third electrode plate 401 and a fourth electrode plate 402. The third electrode plate 401 is opposite to the first electrode plate 2, and the fourth electrode plate 402 is opposite to the second electrode plate 3. The first electrode plate 2, the second electrode plate 3, the third electrode plate 401, and the fourth electrode plate 402 are all insulated from each other. The first electrode plate 2 is connected to a positive voltage, the second electrode plate 3 is connected to a negative voltage, and the third electrode plate and the fourth electrode plate 402 are not connected to electricity. An electric field is formed between the first electrode plate 2 and the third electrode plate 401, and an electric field is formed between the fourth electrode plate 402 and the second electrode plate 3. The first electrode plate 2, the second electrode plate 3, the third electrode plate 401, and the fourth electrode plate 402 are respectively connected to the input terminal of a data processing device outside the housing 1 through signal cables.
[0030] In the above embodiments, the first electrode plate 2 and the intermediate electrode plate 4 form a set of capacitors, and the intermediate electrode plate 4 and the second electrode plate 3 form a set of capacitors. When calculating the moisture content, the moisture content detected by each set of capacitors is multiplied by the area between its electrodes as a weight, and the weighted average value is the total moisture content in the shell 1.
[0031] In the above embodiments, the number of intermediate plates and the distance between each plate can be determined according to design requirements, and the calculation method is the same as in the above embodiments.
[0032] To better illustrate the beneficial effects of this utility model, refer to Figure 6 Select two identical steel pipes, and name them steel pipe A and steel pipe B respectively. The steel pipes are... A DN150 steel pipe is used. A first electrode plate 2 and a second electrode plate 3 are installed inside pipe A, and a first electrode plate 2, a second electrode plate 3, and an intermediate electrode plate 4 are installed inside pipe B. The distance between the first electrode plate 2 and the second electrode plate 3 is the same in both pipes. Both pipes are placed in a water tank, and water is gradually poured into the tank. The water level values at 11 test points in the tank are measured using the electrode plates installed in the two pipes. These 11 test points represent 0%, 1%, and 2% of the full water level, respectively. 0%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%; that is, the effective liquid level heights corresponding to these 11 water level test points are 0mm, 14.56mm, 29.12mm, 43.68mm, 58.24mm, 72.8mm, 87.36mm, 101.92mm, 116.48mm, 131.04mm, and 145.6mm. The test results are shown in Table 1.
[0033] Table 1 Liquid Level Detection Results
[0034]
[0035]
[0036] As can be seen from label 1, the average error of the liquid level value detected by the electrode plate in pipe A is 0.229%, and the average error of the liquid level value detected by the electrode plate in pipe B is 0.164%. It can be seen that the moisture content detector proposed in this utility model has higher accuracy than the traditional moisture content detector.
[0037] The specific embodiments of this utility model are provided to enable those skilled in the art to understand or implement this utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.
[0038] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.
Claims
1. A moisture content detector based on capacitance method or radio frequency admittance method, characterized in that, Includes a housing (1), in which a first electrode plate (2) and a second electrode plate (3) are disposed, the first electrode plate (2) and the second electrode plate (3) are opposite to each other, and an intermediate electrode plate (4) is disposed between the first electrode plate (2) and the second electrode plate (3).
2. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The first electrode plate (2), the second electrode plate (3) and the intermediate electrode plate (4) are mutually insulated.
3. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The first electrode plate (2), the second electrode plate (3) and the intermediate electrode plate (4) are respectively connected to the input end of the data processing device outside the housing (1) via signal cables.
4. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The first electrode plate (2) and the second electrode plate (3) are connected to positive voltage and negative voltage respectively, and the middle electrode plate (4) is not connected to electricity.
5. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The first electrode (2) and the second electrode (3) are respectively connected to positive voltage, and the middle electrode (4) is connected to negative voltage, or the first electrode (2) and the second electrode (3) are respectively connected to negative voltage, and the middle electrode (4) is connected to positive voltage.
6. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The intermediate electrode plate (4) is formed by stacking a third electrode plate (401) and a fourth electrode plate (402). The third electrode plate (401) is opposite to the first electrode plate (2), and the fourth electrode plate (402) is opposite to the second electrode plate (3). The first electrode plate (2), the second electrode plate (3), the third electrode plate (401) and the fourth electrode plate (402) are all insulated from each other.
7. A moisture content detector based on capacitance method or radio frequency admittance method according to claim 1, characterized in that, The first plate (2) and the second plate (3) are connected to positive voltage and negative voltage respectively, while the third plate (401) and the fourth plate (402) are not connected to electricity.