Capacitive medium detection sensor

Abstract

The utility model discloses a capacitive medium detection sensor. The capacitive medium detection sensor comprises an outer cylinder and an electrode plate, the capacitive medium detection sensor comprises an outer cylinder body, a sleeve is connected in the outer cylinder body in a sleeved mode, a mainboard is installed in the sleeve, two electrode plates are fixed in the sleeve, and the two electrode plates are installed on the two sides of the mainboard respectively. Different media can change electric field distribution among the electrode plates, so that capacitance values are changed, when dielectric constants of the media are large, electric field lines are denser, the capacitance values are increased, otherwise, the capacitance values are decreased, and measurement values of the three media including air, oil and water are different. The medium detection device is simple in overall structure, high in sensitivity, good in repeatability, low in failure rate and convenient to maintain and install.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sensor technical field especially relates to a capacitive dielectric detection sensor. BACKGROUND

[0002] The oil tank leakage monitoring of gas station has been paid more and more attention by gas station, so it needs to carry out leakage detection and unloading emptying detection.

[0003] The current detection usually has the following several ways: 1. float switch type leak detection sensor, through the float ball switch detection liquid existence or not;2. photoelectric leak detection sensor, utilize the refraction of light in different substances, thereby identify whether there is liquid leakage, and can further identify the category of matter;3. ultrasonic liquid sensor, utilize the speed difference of ultrasonic wave in different medium to distinguish medium, but, 1. through float switch type can only detect liquid existence or not, cannot distinguish medium category, and mechanical mechanism is prone to failure;2. photoelectric type is susceptible to environmental light due to utilize optical principle, and probe part is contacted with medium, is susceptible to impurity;3. ultrasonic type can distinguish liquid and other medium well, but for water and product oil exists detection blind area, single technology cannot distinguish completely, and the cost is relatively high, based on this, a capacitive dielectric detection sensor is proposed. Utility model content

[0004] In order to solve the problems in the prior art, the utility model provides a capacitive dielectric detection sensor, different media are detected through the setting electrode sheet, the change of capacitance is converted into electric signal output through mainboard, different media will change the electric field distribution between electrode sheet, thereby leading to the change of capacitance value, when the dielectric constant of medium is larger, will make electric field line more dense, capacitance value increases, on the contrary, capacitance value reduces, the measurement value of air, oil and water three kinds of media is different, thereby realizing the distinction of detection site medium, overall simple structure, high sensitivity, good repeatability, low failure rate and convenient maintenance and installation.

[0005] In order to achieve the above object, the utility model provides the following technical scheme:

[0006] The utility model relates to a capacitive dielectric detection sensor, including the outer cylinder and electrode sheet, the sleeve is sleeved in the outer cylinder, the mainboard is installed in the sleeve, two electrode sheets are fixed in the sleeve, two electrode sheets are installed in the both sides of mainboard respectively, and the upper end of electrode sheet extends to the outside of sleeve, the bottom end of sleeve is equipped with the cable in the middle part, and the upper end of cable is connected with mainboard, the outside welding of outer cylinder has the mounting plate, and mounting hole is formed in the four corners of mounting plate, and the capacitive change is converted into electric signal output through mainboard through the setting electrode sheet and detects different medium, and the electric field distribution between electrode sheets is changed by different medium, thereby leading to the capacitive change, when the dielectric constant of medium is big, the electric field line is more dense, and the capacitive value increases, contrarily, the capacitive value reduces, and the measurement value of air, oil and water three kinds of medium is different, thereby realizing the differentiation of detection site medium, and the overall structure is simple, and the sensitivity is high, and the repeatability is good, and the failure rate is low, the mounting plate is set up outside the outer cylinder, and the mounting hole is formed in the four corners of mounting plate, which is more convenient for maintenance and installation.

[0007] Further, the inner side of the upper end of the sleeve is fixed with a sealing ring, and the electrode sheet penetrates into the sealing ring. By fixing the sealing ring on the inner side of the upper end of the sleeve and penetrating the electrode sheet into the sealing ring, the medium is prevented from flowing into the sleeve and contacting the mainboard during use, thereby ensuring good sealing performance.

[0008] Compared with the prior art, the utility model has the advantages that: the capacitive change is converted into electric signal output through mainboard through the setting electrode sheet and detects different medium, and the electric field distribution between electrode sheets is changed by different medium, thereby leading to the capacitive change, when the dielectric constant of medium is big, the electric field line is more dense, and the capacitive value increases, contrarily, the capacitive value reduces, and the measurement value of air, oil and water three kinds of medium is different, thereby realizing the differentiation of detection site medium, and the overall structure is simple, and the sensitivity is high, and the repeatability is good, and the failure rate is low, the mounting plate is set up outside the outer cylinder, and the mounting hole is formed in the four corners of mounting plate, which is more convenient for maintenance and installation, and the inner side of the upper end of the sleeve is fixed with a sealing ring, and the electrode sheet penetrates into the sealing ring, thereby preventing the medium from flowing into the sleeve and contacting the mainboard during use, and ensuring good sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 It is a structural schematic diagram of the utility model.

[0010] Fig. 2 It is a front side sectional structure schematic diagram of the utility model.

[0011] Fig. 3 It is a sleeve internal structure schematic diagram of the utility model.

[0012] In the diagram: 1 Outer cylinder, 2 Sleeve, 3 Main board, 4 Electrode plate, 5 Cable, 6 Mounting plate, 7 Mounting hole, 8 Sealing ring. Detailed Implementation

[0013] 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, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0014] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "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 this utility model 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 this utility model. Example

[0015] See appendix Figs. 1-3 As shown, a capacitive dielectric sensor includes an outer cylinder 1 and electrode plates 4. A sleeve 2 is fitted inside the outer cylinder 1, and a main board 3 is installed inside the sleeve 2. Two electrode plates 4 are fixed inside the sleeve 2, respectively mounted on both sides of the main board 2, with the upper ends of the electrode plates 4 extending to the outer side of the sleeve 2. A cable 5 passes through the middle of the bottom end of the sleeve 2, and the upper end of the cable 5 is connected to the main board 2. A mounting plate 6 is welded to the outer side of the outer cylinder 1, and mounting holes 7 are provided at each of the four corners of the mounting plate 6. By setting the electrode plates 4, different dielectrics are detected, and the change in capacitance is transmitted to the main board 3. Converted into an electrical signal output, different media will change the electric field distribution between electrode plates 4, thus causing the capacitance value to change. When the dielectric constant of the medium is large, the electric field lines will be denser and the capacitance value will increase, and vice versa. The measurement values ​​of air, oil and water are different, thus realizing the differentiation of the medium at the detection location. The overall structure is simple, with high sensitivity, good repeatability and low failure rate. By setting the mounting plate 6 on the outside of the outer cylinder 1 and opening the mounting holes 7 at the four corners of the mounting plate 6, maintenance and installation are more convenient.

[0016] A sealing ring 8 is fixed to the inner side of the upper end of the sleeve 2, and the electrode plate 4 passes through the sealing ring 8. By fixing the sealing ring 8 to the inner side of the upper end of the sleeve 2 and having the electrode plate 4 pass through the sealing ring 8, the medium is prevented from flowing into the sleeve 2 and contacting the main board 3 during use, thus ensuring good sealing performance.

[0017] Working principle: the outer cylinder 1 is inserted in the oil station oil outlet or empty air, through the installation plate 6 outside the outer cylinder 1, and the installation hole 7 is set in the four corners of the installation plate 6, it is more convenient to maintain and install, the electrode sheet 4 is used for detecting different media, the change of the capacitance is converted into electric signal output through the mainboard 3, different media will change the electric field distribution between the electrode sheet 4, so that the capacitance value changes, when the dielectric constant of the medium is larger, the electric field line is more dense, the capacitance value increases, on the contrary, the capacitance value decreases, the measurement values of air, oil and water three kinds of media are different, so that the medium of the detection part is distinguished, the overall structure is simple, the sensitivity is high, the repeatability is good, the failure rate is low, the sealing ring 8 is fixed on the inner side of the sleeve 2 upper end, and the electrode sheet 4 penetrates in the sealing ring 8, prevents the medium from flowing into the sleeve 2 and contacting the mainboard 3 during use, and guarantees good sealing performance.

[0018] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, for those skilled in the art, obviously, the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model, therefore, no matter from which point of view, the embodiments should be regarded as exemplary, and are non-restrictive, the scope of the utility model is defined by the appended claims instead of the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims should be included in the utility model, any figure mark in the claims should not be regarded as limiting the claims.

[0019] In addition, it should be understood that, although the present specification is described according to the embodiments, not every embodiment contains only one independent technical scheme, the description manner of the specification is only for the sake of clarity, the skilled in the art should regard the specification as a whole, and the technical scheme in each embodiment can also be combined appropriately to form other embodiments that the skilled in the art can understand.

Claims

1. A capacitive dielectric detection sensor comprising an outer cylinder and an electrode sheet, characterized by: The outer cylinder is sleeved with a sleeve, the sleeve is internally provided with a main plate, two electrode sheets are fixed in the sleeve, the two electrode sheets are respectively arranged on the two sides of the main plate, the upper end of the electrode sheet extends to the outside of the sleeve, a cable is arranged in the middle of the bottom end of the sleeve, the upper end of the cable is connected with the main plate, and the outer side of the outer cylinder is welded with a mounting plate.

2. A capacitive dielectric detection sensor according to claim 1, wherein: The upper end of the sleeve is internally fixed with a sealing ring, and the electrode sheet penetrates into the sealing ring.

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