CN214408781U - Device for detecting moisture and air content in oil - Google Patents
Device for detecting moisture and air content in oil Download PDFInfo
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- CN214408781U CN214408781U CN202120441403.5U CN202120441403U CN214408781U CN 214408781 U CN214408781 U CN 214408781U CN 202120441403 U CN202120441403 U CN 202120441403U CN 214408781 U CN214408781 U CN 214408781U
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Abstract
The utility model discloses a detect device of moisture and air content in fluid belongs to industrial sensor technical field. The utility model comprises a testing cavity, a testing cavity is arranged in the testing cavity along the length direction, the two ends of the testing cavity are sealed by a first end supporting body and a second end supporting body, an intermediate supporting body is arranged in the middle of the testing cavity, and the intermediate supporting body is provided with a fluid channel which is communicated with the front and the back; a first columnar inner electrode and a second columnar inner electrode which are coaxial with the test cavity are respectively arranged on two sides of the middle support body, and the first columnar inner electrode and the second columnar inner electrode are both columnar electrodes with equal diameters; the first columnar inner electrode and the test cavity form a first detection capacitor, and the second columnar inner electrode and the test cavity form a second detection capacitor. The utility model discloses to the inconvenient current situation of moisture and air content detection in the present fluid, plan to provide a device that detects moisture and air content in the fluid, adopt differential capacitance structural design, moisture and air content in the fluid of detection simultaneously have stronger interference killing feature.
Description
Technical Field
The utility model relates to an industrial sensor technical field, more specifically say, relate to a detect device of moisture and air content in fluid.
Background
In industrial equipment, various lubricating oil, hydraulic oil and other oil liquids are used in a large quantity to reduce mechanical friction and transfer mechanical pressure. The oil liquid can have property change and performance degradation caused by water inflow in the using process, and meanwhile, the heat transfer performance of the oil liquid can be reduced by mixing air into the oil liquid, so that single-phase flow is changed into gas-liquid mixed-phase flow, and the working stability of the oil liquid is seriously influenced. The change of the moisture and air content of the oil liquid can be monitored, the damage to equipment and the fault shutdown can be reduced, and the improvement of the utilization efficiency of the equipment is of great significance.
The capacitance sensor detects the moisture change of the oil liquid by measuring the dielectric constant change of the oil liquid, and is applied more in actual production, but the capacitance sensor is rarely used for detecting the content of air in the oil liquid. Because the moisture content and the air content in the oil can all influence the dielectric constant of the oil, and the action directions are opposite, under the condition that water enters and air is mixed into the oil simultaneously, the capacitance detection technology applied to the market at present is difficult to accurately measure the moisture content in the oil, and the condition of misinformation often can appear.
After retrieval, the method comprises the following steps: 2020105393089, title of invention: a fast response moisture in oil humidity sensitive capacitor, the application comprising: the heating unit is arranged below the humidity sensitive material and used for heating the humidity sensitive material so as to improve the moisture absorption and dehumidification speed of the humidity sensitive material. According to the application, the heating unit is introduced, so that the moisture absorption and dehumidification speed of the moisture sensitive material can be increased, and the effect of increasing the response speed of the moisture sensitive capacitor in complex environments such as oil is achieved. Also as in chinese patent application No.: 2014105327645, title of invention: an oil trace moisture online monitoring sensor comprises a polymer film capacitor, a temperature sensor, a signal processing circuit board and a mechanical packaging structure, wherein the polymer film capacitor and the temperature sensor are respectively used for measuring the trace moisture content and the temperature of oil; the signal processing circuit board is used for detecting and processing output signals of the polymer film capacitor and the temperature sensor and converting the output signals into oil water content and temperature values. The application mainly aims at solving the problem of monitoring the moisture of aviation oil in real time. Thus, a great deal of technology is available for detecting the water content of oil, but a new simple and effective mode is still needed in the industry.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The utility model discloses an aim at detects inconvenient current situation of moisture and air content in to present fluid, plans to provide a device that detects moisture and air content in the fluid, adopts differential capacitance structural design, detects moisture and air content in the fluid simultaneously, and device simple structure has stronger interference killing feature.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses a detect device of moisture and air content in fluid, including the test cavity, set up the test chamber in the test chamber along length direction, the both ends of test chamber are sealed through first end supporter and second end supporter, install the intermediate strut body in the test chamber, and the intermediate strut body is equipped with the fluid passageway that link up around supplying; a first columnar inner electrode and a second columnar inner electrode which are coaxial with the test cavity are respectively arranged on two sides of the middle support body, and the first columnar inner electrode and the second columnar inner electrode are both columnar electrodes with equal diameters; the first columnar inner electrode and the test cavity form a first detection capacitor, and the second columnar inner electrode and the test cavity form a second detection capacitor; the diameter of the test cavity is D, the outer diameter of the first cylindrical inner electrode is D1, the effective length is W1, the outer diameter of the second cylindrical inner electrode is D2, the effective length is W2, D1 is more than D2, and W1 Ln (D/D2) is W2 Ln (D/D1).
The utility model discloses a detect device of moisture and air content in fluid, including the test cavity, set up the test chamber in the test chamber along length direction, the both ends of test chamber are sealed through first end supporter and second end supporter, install the intermediate strut body in the test chamber, and the intermediate strut body is equipped with the fluid passageway that link up around supplying; the two sides of the middle support body are respectively provided with a first columnar inner electrode and a second columnar inner electrode which are coaxial with the test cavity, the first columnar inner electrode and the test cavity form a first detection capacitor, the second columnar inner electrode and the test cavity form a second detection capacitor, the first columnar inner electrode is a variable-diameter columnar electrode, the maximum outer diameter of the first columnar inner electrode is d3, the second columnar inner electrode is an equal-diameter columnar electrode, the outer diameter of the second columnar inner electrode is d2, d3> d2, and the capacitance values of the first detection capacitor and the second detection capacitor in the air are the same.
Furthermore, the first columnar inner electrode is a symmetrical variable-diameter columnar electrode, the outer diameter of the middle area is larger than that of the two end areas, and the middle large-diameter area and the two small-diameter areas are in conical smooth transition.
Further, the surface of the first detection capacitor is coated with a hydrophobic film and is configured as a rough surface for adsorbing bubbles in the oil.
Furthermore, the surface of the second detection capacitor is coated with a hydrophilic film for adsorbing moisture in the oil.
Furthermore, the oil passage area on the intermediate support is provided with a filter membrane for adsorbing bubbles.
Furthermore, the test cavity, the first columnar inner electrode and the second columnar inner electrode are made of metal materials respectively, and the middle support body, the first end support body and the second end support body are made of insulating materials.
Furthermore, an oil inlet and an oil outlet are formed in the test cavity along the length extension direction, and the horizontal height position of the oil outlet is higher than that of the oil inlet.
Furthermore, the first end support body and the second end support body are respectively provided with a through hole which is correspondingly used as an oil inlet and an oil outlet.
Furthermore, the test cavity is provided with a wiring through hole for leading out the internal electrode connecting wire, and the middle support body is also provided with a wiring through hole corresponding to the wiring through hole.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
(1) the utility model discloses a device of moisture and air content in the detection fluid adopts differential capacitance structural design, utilizes the diameter of two inner electrodes to change the setting, can effectively measure the moisture and the bubble content change of fluid, and overall structure is simple, and the cost is lower, and easy and simple to handle.
(2) The utility model discloses a device of moisture and air content in detection fluid, be equipped with first detection electric capacity and second detection electric capacity, both capacitance values in the air are the same, and insert differential capacitance detection circuit simultaneously, both have the same material and similar structure, spatial position is very close again, consequently ambient temperature changes and other electromagnetic interference are the same to the influence effect of two capacitance values, adopt differential measurement mode can be fine the first compensation external disturbance to measuring adverse effect, moreover, the steam generator is simple in structure, the interference killing feature is strong, and measuring sensitivity is higher.
Drawings
FIG. 1 is a schematic structural view of the device for detecting the moisture and air content in oil according to the present invention;
FIG. 2 is a schematic view of the cross-sectional structure of the device for detecting the moisture and air content in oil according to the present invention;
fig. 3 is a schematic view of the diameter-variable electrode structure of the device for detecting moisture and air content in oil according to the present invention.
The reference numerals in the schematic drawings illustrate:
100. a test chamber; 101. an oil inlet; 102. an oil outlet; 200. an intermediate support; 300. a first end support; 400. A first columnar inner electrode; 500. a second columnar inner electrode; 600. a second end support; 700. and (4) filtering the membrane.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1 and fig. 2, the device for detecting moisture and air content in oil according to the present embodiment includes a testing cavity 100, a testing cavity, specifically a testing cavity with a through hole of equal diameter, is formed in the testing cavity 100 along a length direction, two ends of the testing cavity are sealed by a first end support 300 and a second end support 600, an intermediate support 200 is installed in the testing cavity, and an oil passage for passing through the intermediate support 200 is formed in the intermediate support 200; a first cylindrical inner electrode 400 and a second cylindrical inner electrode 500 which are coaxial with the test cavity are respectively arranged on two sides of the middle support 200, namely, the first cylindrical inner electrode 400 is arranged between the middle support 200 and the first end support 300, the second cylindrical inner electrode 500 is arranged between the middle support 200 and the second end support 600, the first cylindrical inner electrode 400 and the test cavity 100 form a first detection capacitor, and the second cylindrical inner electrode 500 and the test cavity 100 form a second detection capacitor; the capacitance values of the first detection capacitor and the second detection capacitor in the air are the same, and the first detection capacitor and the second detection capacitor are connected to the differential capacitance detection circuit at the same time.
In this embodiment, the testing chamber 100 is made of a metal material, and the intermediate supporting body 200, the first end supporting body 300 and the second end supporting body 600 are made of an insulating material. In this embodiment, the test chamber 100 is provided with a routing through hole for leading out an internal electrode connection line, and the intermediate support 200 is also provided with a corresponding routing through hole aligned with the through hole, specifically as shown in fig. 1, the test chamber 100 is provided with a routing through hole perpendicular to the oil flow direction, the intermediate support 200 may have a radial distribution spoke structure, and the middle of the spoke structure is provided with a corresponding routing through hole; the intermediate support 200 may also be a disk-shaped structure, the diameter of the disk is the same as that of the test chamber, and a plurality of through holes for oil to flow through are arranged on the disk as oil passages. In this embodiment, the oil inlet 101 and the oil outlet 102 are disposed on the testing cavity 100 along the oil flowing direction, the horizontal height position of the oil outlet 102 is higher than the horizontal height position of the oil inlet 101, as shown in fig. 2, oil inlets and outlets are installed on two sides of the testing cavity 100, the oil inlet 101 is disposed at the bottom of the side face of the first detection capacitor, and the oil outlet 102 is disposed at the top of the side face of the second detection capacitor.
It should be noted that, in the present embodiment, the first pillar inner electrode 400 and the second pillar inner electrode 500 are both equal-diameter pillar electrodes; the diameter of the test chamber inside the test chamber 100 is D, the outer diameter of the first pillar inner electrode 400 is D1, the effective length is W1, the outer diameter of the second pillar inner electrode 500 is D2, the effective length is W2, D1> D2, W1 < W2, W1 Ln (D/D2) ═ W2 Ln (D/D1), and Ln is the auto-thermal logarithm operation. When D-D1 is small, the effect of the air bubbles in the oil on the capacitance values of the first and second detection capacitors is different. The smaller D-D1, the greater the effect of a bubble of the same size on the first detection capacitance. In this embodiment, D-D1 is 1 mm.
In this embodiment, the metal test cavity 100 is used as a grounding electrode of the detection capacitor, so that a strong shielding effect is provided for external interference, and since the first detection capacitor and the second detection capacitor are made of the same material and have similar structures and are very close to each other in spatial position, the influence of environmental temperature change and other electromagnetic interference on the two capacitance values is the same, and the adverse effect of the external interference on the measurement can be well compensated by adopting a differential measurement mode. During practical application, oil to be detected enters the test cavity from the oil inlet 101, flows out from the oil outlet 102 after being filled with the test cavity, and the capacitance of the first detection capacitor and the capacitance of the second detection capacitor and the differential capacitance change of the first detection capacitor and the second detection capacitor are measured to measure the moisture content and the bubble content change of the oil.
Example 2
As shown in fig. 3, the apparatus for detecting moisture and air content in oil of this embodiment is basically the same as the structure of embodiment 1, except that the first cylindrical inner electrode 400 is a variable diameter cylindrical electrode with a maximum outer diameter d3, the second cylindrical inner electrode 500 is an equal diameter cylindrical electrode with an outer diameter d2, and d3> d2, and the capacitance values of the first detection capacitor and the second detection capacitor in air are the same. More specifically, the first cylindrical inner electrode 400 is a symmetrical variable diameter cylindrical electrode, wherein the outer diameter of the middle region is larger than that of the two end regions, and the middle large diameter region and the two end small diameter regions are in a tapered smooth transition. Similarly, a step-shaped transition may also be adopted between the middle region and the end region of the first pillar inner electrode 400, which is not described herein again. This design allows for a smaller value of D-D3 to further increase the sensitivity of detection while facilitating practical installation operations.
Example 3
The device for detecting the moisture and air content in the oil liquid of the present embodiment is basically the same as embodiment 1 or embodiment 2, and further, in the present embodiment, a filtering membrane 700 for adsorbing bubbles is installed in the oil liquid passage area on the intermediate support 200, as shown in fig. 2, the intermediate support 200 adopts a spoke type structure, that is, the filtering membrane 700 is installed in the spoke gap, and the filtering membrane 700 can effectively adsorb bubbles in the oil liquid, thereby further improving the detection sensitivity.
Example 4
The device for detecting the moisture and air content in the oil is basically the same as the above embodiment, and further, in this embodiment, the surface of the first detection capacitor is coated with a hydrophobic film and is configured as a rough surface for adsorbing air in the oil and forming bubbles, and the surface of the second detection capacitor is coated with a hydrophilic film for adsorbing moisture in the oil. Wherein the surface of the detection capacitor comprises the outer surface of the cylindrical inner electrode and the inner cavity portion of the test chamber 100 corresponding to the cylindrical inner electrode. Therefore, the measuring effect on the moisture and air content in the oil can be further improved.
In the practical application, when the fluid that awaits measuring passes through first detection electric capacity and second detection electric capacity in proper order, air in the fluid can gather at first detection electric capacity surface and form the bubble, because the clearance between the internal and external electrodes of first detection electric capacity is very little, the bubble of formation can lead to the capacitance value decline range of first detection electric capacity great, filtration membrane 700 can adsorb more air simultaneously, lead to flowing into the bubble significantly reduced in the fluid of second detection electric capacity, therefore the bubble is less to the influence that the second detected electric capacity. The water absorption film on the surface of the second detection capacitor can absorb free water in oil, so that the capacitance value of the second detection capacitor is increased. Thus, the increase of the moisture content in the oil liquid causes the capacitance value of the second detection capacitor to increase more than the capacitance value of the first detection capacitor. The increase of the air content in the oil causes the capacitance value of the first detection capacitor to decrease faster than the capacitance value of the second detection capacitor. And the capacitance value change of the first detection capacitor and the second detection capacitor and the differential capacitance change of the first detection capacitor and the second detection capacitor are measured simultaneously, so that the moisture content and the air content in the oil can be measured simultaneously.
Example 5
Basically, the device for detecting the moisture and air content in the oil according to the present embodiment is similar to the above-mentioned embodiment, and further, as shown in fig. 3, the device according to the present embodiment may be directly connected to an oil pipeline for application, the oil inlet 101 and the oil outlet 102 are not disposed on the testing chamber 100, but the first end support 300 and the second end support 600 are respectively provided with a through hole, and are correspondingly used as the oil inlet 101 and the oil outlet 102, so that the application is more flexible and convenient.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a detect device of moisture and air content in fluid which characterized in that: the testing device comprises a testing cavity (100), wherein a testing cavity is formed in the testing cavity (100) along the length direction, two ends of the testing cavity are sealed through a first end supporting body (300) and a second end supporting body (600), an intermediate supporting body (200) is installed in the testing cavity, and an oil liquid channel which is communicated from front to back is formed in the intermediate supporting body (200); a first cylindrical inner electrode (400) and a second cylindrical inner electrode (500) which are coaxial with the test cavity are respectively arranged on two sides of the middle support body (200), and both electrodes are cylindrical electrodes with equal diameters; the first columnar inner electrode (400) and the test cavity (100) form a first detection capacitor, and the second columnar inner electrode (500) and the test cavity (100) form a second detection capacitor; the diameter of the test cavity is D, the outer diameter of the first columnar inner electrode (400) is D1, the effective length is W1, the outer diameter of the second columnar inner electrode (500) is D2, the effective length is W2, D1> D2, and W1 Ln (D/D2) ═ W2 Ln (D/D1).
2. The utility model provides a detect device of moisture and air content in fluid which characterized in that: the testing device comprises a testing cavity (100), wherein a testing cavity is formed in the testing cavity (100) along the length direction, two ends of the testing cavity are sealed through a first end supporting body (300) and a second end supporting body (600), an intermediate supporting body (200) is installed in the testing cavity, and an oil liquid channel which is communicated from front to back is formed in the intermediate supporting body (200); the two sides of the middle support body (200) are respectively provided with a first cylindrical inner electrode (400) and a second cylindrical inner electrode (500) which are coaxial with the test cavity, the first cylindrical inner electrode (400) and the test cavity (100) form a first detection capacitor, the second cylindrical inner electrode (500) and the test cavity (100) form a second detection capacitor, the first cylindrical inner electrode (400) is a variable-diameter cylindrical electrode, the maximum outer diameter of the first cylindrical inner electrode is d3, the second cylindrical inner electrode (500) is an equal-diameter cylindrical electrode, the outer diameter of the second cylindrical inner electrode is d2, d3> d2, and the capacitance values of the first detection capacitor and the second detection capacitor in the air are the same.
3. The device for detecting the moisture and air content in the oil according to claim 2, wherein: the first columnar inner electrode (400) is a symmetrical variable-diameter columnar electrode, the outer diameter of the middle area is larger than that of the two end areas, and the middle large-diameter area and the two small-diameter areas are in conical smooth transition.
4. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: the surface of the first detection capacitor is coated with a hydrophobic film and is set to be a rough surface for adsorbing bubbles in oil.
5. The device for detecting the moisture and air content in the oil according to claim 4, wherein: the surface of the second detection capacitor is coated with a hydrophilic film for adsorbing moisture in the oil.
6. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: a filter membrane (700) for adsorbing bubbles is attached to the oil passage region of the intermediate support (200).
7. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: the testing chamber (100), the first columnar inner electrode (400) and the second columnar inner electrode (500) are made of metal materials respectively, and the middle supporting body (200), the first end supporting body (300) and the second end supporting body (600) are made of insulating materials.
8. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: an oil inlet (101) and an oil outlet (102) are arranged on the testing cavity (100) along the length extension direction, and the horizontal height position of the oil outlet (102) is higher than that of the oil inlet (101).
9. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: through holes are respectively formed in the first end supporting body (300) and the second end supporting body (600) and correspondingly used as an oil inlet (101) and an oil outlet (102).
10. The apparatus for detecting the moisture and air content in oil according to claim 1 or 2, wherein: the testing cavity (100) is provided with a wiring through hole for leading out the internal electrode connecting wire, and the middle supporting body (200) is also provided with a wiring through hole corresponding to the wiring through hole.
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| CN202120441403.5U CN214408781U (en) | 2021-03-01 | 2021-03-01 | Device for detecting moisture and air content in oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030200A (en) * | 2021-03-01 | 2021-06-25 | 深圳市先波科技有限公司 | Oil liquid detection device and detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113030200A (en) * | 2021-03-01 | 2021-06-25 | 深圳市先波科技有限公司 | Oil liquid detection device and detection method thereof |
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