CN210892993U - Nonmetal pipeline dirt thickness detection device based on electric capacity method - Google Patents

Abstract

A non-metallic pipeline fouling thickness detection device based on a capacitance method. The detection device includes a PLA fixed shell, a fixed screw, an electrode shield, a metal electrode plate and a rubber protective shield lead. The PLA fixed shell has a circular hoop-like structure and is fixed by The screws are locked, and the outer edge of the PLA fixed shell is provided with a blocking block and a blocking groove, respectively. The metal electrode plate and the electrode shield are symmetrically fixed and installed on the PLA fixed casing from the inside to the outside through the blocking block and the blocking groove. The rubber protects the shielding lead extending. The center of the metal electrode plate is drawn out from the outlet provided on the side of the PLA fixed shell. The utility model can be installed on the outer wall of the non-metallic pipe and used to measure the fouling thickness of the non-metallic pipe.

Description

A non-metallic pipeline fouling thickness detection device based on capacitance method

technical field

The utility model relates to the technical field of non-metallic pipeline fouling detection, in particular to a non-metallic pipeline fouling thickness detection device based on a capacitance method.

Background technique

At present, all kinds of non-metallic PPR, PVC, glass fiber, PE and other material pipes have been widely used in life and industry. With the rapid development of industrial production and living standards, the harm caused by pipe fouling is also increasing. It causes the reduction of the flow area of the pipeline, the increase of the energy consumption of transportation, and the phenomenon of pipe blockage, deformation and bursting in severe cases, which brings huge hidden dangers to the safe operation of the circulating water system and huge losses in economic production.

At present, there are several problems in the research on the detection of fouling thickness of non-metallic pipes: for the non-contact detection method, there are many detection parameters, and the introduction error increases; for the contact detection method, the detection probe is easily contaminated, and the detection results are inaccurate , the probe damage is relatively large; secondly, some detection devices consume a lot of power, and the economic loss is serious.

Utility model content

The purpose of the present utility model is to overcome the deficiencies of the prior art, and to provide a non-metallic pipeline fouling thickness detection device and method based on a capacitance method, so as to solve the problems raised by the above-mentioned technical background.

The purpose of this utility model is to achieve through the following technical solutions:

A non-metallic pipeline dirt thickness detection device based on a capacitance method, comprising a PLA fixed casing, a fixed screw, an electrode shield, a metal electrode plate and a rubber protective shield lead, the PLA fixed casing has a circular hoop-like structure, and the PLA is fixed The upper and lower ends of the casing are respectively provided with screw holes, the fixing screws lock the PLA fixing casing through the screw holes, the outer edge of the PLA fixing casing is respectively provided with a clamping block and a clamping groove, the metal electrode plate and the electrode shielding cover They are respectively fixed and installed on the PLA fixed casing symmetrically from the inside to the outside through the clamping block and the clamping groove. The rubber protective shielding lead extends from the center of the metal electrode plate and is led out from the outlet provided on the side of the PLA fixed casing.

Further, the side surface of the electrode shield is provided with a groove for the lead out of the rubber protection shield.

Further, a metal electrode lead connector is provided on the outlet, and the metal electrode lead connector is electrically connected with the rubber protective shield lead.

Further, the rubber protective shielding leads are respectively provided with a rubber protective layer, a grid-shaped metal shielding layer and a metal electrode lead from the outside to the inside.

Further, the inner diameter of the PLA fixed shell is the same as the outer diameter of the non-metallic pipe to be tested.

The beneficial effects of the utility model are: the utility model can be installed on the outer wall of the non-metallic pipe, and with the help of the LCR digital bridge measuring instrument and the capacitive sensor detector, the non-contact accurate measurement of the dirt thickness of the non-metallic pipe can be indirectly realized, and simultaneously The utility model also has the characteristics of simple installation, convenient operation, accurate measurement and fast response speed, and can be widely used in industrial production, domestic water, chemical experiments and other places for the detection of non-metallic pipeline fouling in circulating water systems.

Description of drawings

Fig. 1 is the exploded view of the utility model detection device;

Fig. 2 is the structural representation of the utility model PLA fixed shell;

Fig. 3 is the installation diagram of the utility model detection device and the non-metallic pipeline;

Fig. 4 is the structural schematic diagram of the rubber protection shielding lead wire of the present invention;

Fig. 5 is the front view of the utility model detection device;

Fig. 6 is the side view of the utility model detection chart;

Fig. 7 is the fitting curve diagram of the dirt thickness of the utility model and the measured capacitance value;

Fig. 8 is the relationship diagram of the length of the metal electrode plate of the utility model and the capacitance detection value;

FIG. 9 is a diagram showing the relationship between the opening angle of the metal electrode plate and the capacitance detection value of the present invention.

In the figure, 1-PLA fixing shell, 2-fixing screws, 3-electrode shield, 4-metal electrode plate, 5-rubber protective shield lead, 6-metal electrode lead connector, 7-notch, 8-rubber protective layer , 9-mesh metal shielding layer, 10-metal electrode lead, 11-thread hole, 12-outlet, 13-block, 14-card slot, 15-non-metal pipe.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other under the condition of no conflict.

It should be noted that the drawings provided in the following embodiments are only to illustrate the basic concept of the present invention in a schematic way, and only the components related to the present invention are shown in the drawings instead of the number of components in the actual implementation, In the drawing of shape and size, the type, quantity and proportion of each component can be arbitrarily changed in actual implementation, and the component layout may also be more complicated.

Example:

A non-metallic pipeline dirt thickness detection device based on capacitance method, please refer to Figure 1-Figure 3, including PLA fixing shell 1, fixing screws 2, electrode shielding cover 3, metal electrode plate 4 and rubber protective shielding lead 5; The PLA fixed shell 1 is in the shape of a circular hoop. The upper and lower ends of the PLA fixed shell 1 are respectively provided with screw holes 11. The fixing screw 2 locks the PLA fixed shell 1 through the screw holes 11, and the outer edge of the PLA fixed shell 1 Blocks 13 and grooves 14 are respectively provided, the metal electrode plate 4 and the electrode shielding cover 3 are respectively fixed and installed on the PLA fixed shell 1 symmetrically from the inside to the outside through the blocks 13 and the grooves 14, and the rubber protective shielding lead 5 extends the metal electrode. The center of the board 4 is led out from the outlet 12 provided on the side of the PLA fixed shell 1 .

Further, as shown in Figure-2, the side of the electrode shield 3 is provided with a groove 7 for the lead 5 of the rubber protection shield to be drawn out.

Further, please refer to Figure-1, the outlet 12 is provided with a metal electrode lead connector 6, and the metal electrode lead connector 6 is electrically connected to the rubber protective shield lead 5.

Further, as shown in Figure-4, the rubber protective shielding lead 5 is respectively provided with a rubber protective layer 8, a grid-like metal shielding layer 9 and a metal electrode lead 10 from the outside to the inside, the grid-like metal shielding layer 9 and the electrode lead 10 are respectively provided. The shielding cover 3 can effectively reduce the external interference to the transmission signal of the metal electrode lead 10, and enhance the detection accuracy.

Further, please refer to Figure-3, the inner diameter of the PLA fixed casing 1 is the same as the outer diameter of the non-metallic pipe 15 to be tested. , so that the PLA fixing shell 1 is completely fitted and fixed on the outer wall of the non-metallic pipe 15 .

When the utility model is used, the detection device is fixedly installed on the outer wall of the non-metallic pipe 15 to be measured by fixing screws, the capacitance sensor detector is connected with the metal electrode lead joint 6, and the LCR digital bridge detector is connected with the capacitance. The sensor detector is connected, and finally the upper computer is connected to the LCR digital bridge for detection. At the beginning of the detection, the capacitance data information between the metal electrode plates is collected and obtained through the capacitive sensor detector and the LCR digital bridge detector. Finally, the capacitance data information is quantitatively analyzed by the host computer, and the fitting curve between the thickness of the non-metallic pipeline fouling deposition and the capacitance data information is drawn.

It should be noted that the above embodiments are based on the mechanism of the capacitance method to detect the change of the fouling thickness of non-metallic pipes, and analyze the influence of the dielectric constant between the metal electrode plates 4 on the detection results. With the help of the LCR digital bridge measuring instrument Obtain the capacitance data information between the metal electrode plates 4 collected by the capacitance sensing detector, and quantitatively analyze the multiple sets of capacitance data information through the host computer, and draw a fitting curve diagram of the capacitance data and the dirt deposition results. For the results, please refer to the appendix. As shown in Figure-7, the obtained fitting curve shows that the capacitance value between the metal electrode plates 4 has a linear correlation with the thickness of the dirt.

It needs to be further explained in the above embodiments that the non-metallic pipeline fouling may contain various and multi-type complex media. For different types of fouling with different dielectric constants, the utility model can be used for detection according to the above method to obtain the corresponding fouling medium. Corresponding to the fitting curve, in the above-mentioned embodiment, the detection result of Figure-7 is only an example of the detection of a PPR non-metallic pipe with an outer diameter of 24.5 mm and an inner diameter of 18.5 mm.

Please refer to Figure-5 and Figure-6. The main parameters affecting the detection sensitivity and accuracy of the capacitive sensor include the axial length d of the metal electrode plate 4 and the angle α of the metal electrode plate 4. The finite element simulation analysis software COMSOL is used The electric field steady state of its main parameters is studied and analyzed, and the simulation data results show that the longer the axial length of the metal electrode plate 4 is, the more obvious the change in the thickness of the corresponding pipeline fouling deposition and the capacitance value will be, but the excessively long capacitor plate will cause The "spatial filtering effect" makes the detection of capacitance changes unable to respond. Too short a pole plate makes the capacitance value fluctuation too small and difficult to capture, and the detection difficulty increases. As shown in Figure-8, the capacitance value corresponding to different pole plate axial lengths varies with The relationship between fouling deposition; the larger the plate opening angle, the larger the relative area, and the increase in the thickness of the pipeline fouling will cause greater fluctuation in capacitance value. As shown in Figure-9, the metal electrode plates 4 with different opening angles Corresponding capacitance value as a function of fouling deposition. Compared with the analysis of the results, the optimal electrode parameters are selected to have an axial length of 20 mm and four metal electrode plates with an angle of 140° to design a symmetrical curved metal electrode plate 4, which has the advantages of high detection sensitivity and good linearity.

To sum up, the utility model provides a non-metallic pipeline fouling thickness detection device based on the capacitance method, which has the characteristics of simple installation and convenient operation. Through a large number of experiments, the results are quantitatively analyzed, and the fitting correspondence between the capacitance data and the fouling deposition results is obtained, and the indirect measurement of the fouling thickness of non-metallic pipes is realized. The device has accurate measurement and fast response speed. It is widely used in industrial production, domestic water, chemical experiments and other places to detect the fouling of non-metallic pipelines in circulating water systems.

The above-mentioned embodiments only represent specific embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims (5)

1. A non-metal pipeline dirt thickness detection device based on a capacitance method comprises a PLA fixed shell (1), a fixed screw (2), an electrode shielding case (3), a metal electrode plate (4) and a rubber protection shielding lead (5), it is characterized in that the PLA fixed shell (1) is in a circular hoop-shaped structure, the upper end and the lower end of the PLA fixed shell (1) are respectively provided with a screw hole (11), the fixing screw (2) locks the PLA fixing shell (1) through the screw hole (11), the outer edge of the PLA fixing shell (1) is respectively provided with a clamping block (13) and a clamping groove (14), the metal electrode plate (4) and the electrode shielding case (3) are symmetrically and fixedly arranged on the PLA fixed shell (1) from inside to outside through the clamping block (13) and the clamping groove (14) respectively, the rubber protective shielding lead (5) extends to the center of the metal electrode plate (4) and is led out from a leading-out opening (12) arranged on the side surface of the PLA fixed shell (1).

2. The device for detecting the thickness of the dirt on the non-metal pipeline based on the capacitance method is characterized in that a notch (7) for leading out a rubber protective shielding lead (5) is formed in the side surface of the electrode shielding cover (3).

3. The device for detecting the thickness of the dirt on the non-metal pipeline based on the capacitance method according to claim 1, wherein a metal electrode lead connector (6) is arranged on the leading-out opening (12), and the metal electrode lead connector (6) is electrically connected with the rubber protection shielding lead (5).

4. The device for detecting the thickness of the dirt on the non-metal pipeline based on the capacitance method according to claim 1, wherein the rubber protective shielding lead (5) is provided with a rubber protective layer (8), a latticed metal shielding layer (9) and a metal electrode lead (10) from outside to inside respectively.

5. The non-metal pipeline dirt thickness detection device based on the capacitance method is characterized in that the inner diameter of the PLA fixed shell (1) is the same as the outer diameter of the non-metal pipeline (15) to be detected.

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