CN110895129A - A device and method for detecting the thickness of non-metallic pipeline fouling based on capacitance method - Google Patents

Abstract

A detection device and a method for detecting the thickness of dirt on a non-metal pipeline based on a capacitance method are disclosed, the detection device comprises a PLA fixed shell, a fixed screw, an electrode shield cover, a metal electrode plate and a rubber protection shielding lead, the PLA fixed shell is in a circular hoop-shaped structure and is locked by the fixed screw, the outer edge of the PLA fixed shell is respectively provided with a clamping block and a clamping groove, the metal electrode plate and the electrode shield cover are respectively and symmetrically and fixedly arranged on the PLA fixed shell from inside to outside through the clamping block and the clamping groove, the rubber protection shielding lead extends to the center of the metal electrode plate and is led out from a leading-out opening arranged on the side face of the PLA fixed shell, the detection method comprises the steps of utilizing a capacitance sensor detector and an LCR digital bridge detector to collect and obtain capacitance data information between the metal electrode plates, then carrying out quantitative analysis on a detection result and drawing, the device is simple to install, convenient to measure and capable of measuring the thickness of the dirt of the non-metal pipeline very quickly.

Description

Capacitance method based non-metal pipeline dirt thickness detection device and method

Technical Field

The invention relates to the technical field of nonmetal pipeline dirt detection, in particular to a nonmetal pipeline dirt thickness detection device and method based on a capacitance method.

Background

At present, pipelines made of materials such as various non-metal PPR, PVC, glass fiber and PE are widely used in life and industry, along with the rapid development of industrial production and living standard, the harm caused by pipeline dirt is more and more prominent, the pipeline overflowing area is reduced, the conveying energy consumption is increased, the phenomena of pipe blockage, deformation, burst and the like are caused in serious cases, huge hidden dangers are brought to the safe operation of a circulating water system, and huge losses are brought to economic production.

The current research on the detection of the thickness of the dirt of the non-metal pipeline has the following problems: aiming at a non-contact detection method, more detection parameters are adopted, and introduced errors are increased; aiming at a contact detection method, a detection probe is easy to be polluted, the detection result is inaccurate, and the probe is greatly damaged; secondly, part of the detection devices have large power consumption and serious economic loss.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a device and a method for detecting the thickness of dirt of a non-metal pipeline based on a capacitance method, so as to solve the problems of the technical background.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a non-metallic pipeline dirt thickness detection device based on electric capacity method, includes PLA fixed shell, fixed screw, electrode shield cover, metal plate electrode and rubber protection shielding lead wire, PLA fixed shell is circular staple bolt column structure, and both ends are equipped with the screw respectively about the PLA fixed shell, the fixed screw passes through the screw is with PLA fixed shell locking, and PLA fixed shell's outer edge is equipped with fixture block and draw-in groove respectively, metal plate electrode and electrode shield cover pass through respectively fixture block and draw-in groove from inside to outside symmetry fixed mounting are on PLA fixed shell, rubber protection shielding lead wire prolongs metal plate electrode center and draws forth from locating the drawing-out mouth of PLA fixed shell side.

Furthermore, a notch for leading out the rubber protective shielding lead is arranged on the side surface of the electrode shielding cover.

Furthermore, a metal electrode lead connector is arranged on the leading-out opening and electrically connected with the rubber protective shielding lead.

Furthermore, the rubber protective shielding lead is respectively provided with a rubber protective layer, a latticed metal shielding layer and a metal electrode lead from outside to inside.

Further, the inner diameter of the PLA fixing shell is the same as the outer diameter of the nonmetal pipeline to be measured.

A non-metal pipeline dirt thickness detection method based on a capacitance method comprises the following steps:

s1, fixedly installing the detector on the outer wall of the nonmetal pipeline to be detected through a fixed screw detection device, connecting the capacitance sensor detector with a metal electrode lead connector, then connecting the LCR digital bridge detector with the capacitance sensor detector, and finally connecting the upper computer with the LCR digital bridge detector;

s2, acquiring and acquiring capacitance data information between metal electrode plates through a capacitance sensor detector and an LCR digital bridge detector;

and S3, quantitatively analyzing the capacitance data information by the upper computer and drawing a fitting curve graph between the non-metal pipeline dirt deposition thickness and the capacitance data information.

The invention has the beneficial effects that: the invention analyzes the capacitance solving algorithm of the symmetrical curved plate and the influence of the pipeline dirt deposition on the dielectric constant between the opposite polar plates of the capacitance sensor, designs a capacitance-method nonmetal pipeline dirt thickness detection device, realizes the numerical correspondence between the detection capacitance and the dirt thickness, and indirectly realizes the non-contact accurate measurement of the nonmetal pipeline dirt thickness.

Drawings

FIG. 1 is an exploded view of the detection device of the present invention;

FIG. 2 is a schematic view of the structure of the PLA fixing case of the present invention;

FIG. 3 is an installation view of the detection device of the present invention and a non-metallic pipe;

FIG. 4 is a schematic diagram of a rubber shielded lead according to the present invention;

FIG. 5 is a front view of the detection device of the present invention;

FIG. 6 is a schematic side view of the test of the present invention;

FIG. 7 is a graph of a fit of soil thickness to measured capacitance values according to the present invention;

FIG. 8 is a graph showing the relationship between the length of a metal electrode plate and the detected value of capacitance according to the present invention;

FIG. 9 is a graph showing the relationship between the opening angle of the metal electrode plate and the detected value of the capacitance according to the present invention.

In the figure, 1-PLA fixed shell, 2-fixing screw, 3-electrode shielding cover, 4-metal electrode plate, 5-rubber protective shielding lead, 6-metal electrode lead connector, 7-notch, 8-rubber protective layer, 9-grid metal shielding layer, 10-metal electrode lead, 11-screw, 12-outlet, 13-fixture block, 14-clamp groove and 15-nonmetal pipeline.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Example (b):

a non-metal pipeline dirt thickness detection device based on a capacitance method is shown in attached figures 1-3 and comprises a PLAfixed shell 1, afixed screw 2, anelectrode shielding case 3, ametal electrode plate 4 and a rubberprotection shielding lead 5; PLA fixedcasing 1 is circular staple bolt column structure, both ends are equipped withscrew 11 respectively about PLA fixedcasing 1, setscrew 2 is throughscrew 11 with PLA fixedcasing 1 locking, PLA fixedcasing 1's outer edge is equipped withfixture block 13 and draw-ingroove 14 respectively,metal plate electrode 4 andelectrode shield cover 3 are respectively throughfixture block 13 and draw-ingroove 14 from inside to outside symmetry fixed mounting on PLA fixedcasing 1, rubberprotection shielding lead 5 prolongsmetal plate electrode 4 center and draws forth from locating theoutlet 12 that PLA fixedcasing 1 side.

Further, referring to fig. 2, the side of theelectrode shield 3 is provided with anotch 7 for the rubberprotective shield lead 5 to be led out.

Further, referring to fig. 1, a metalelectrode lead tab 6 is disposed on the lead-outopening 12, and the metalelectrode lead tab 6 is electrically connected to the rubberprotective shielding lead 5.

Further, as shown in fig. 4, the rubberprotective shielding lead 5 is provided with a rubberprotective layer 8, a grid-shapedmetal shielding layer 9 and ametal electrode lead 10 from outside to inside, and the grid-shapedmetal shielding layer 9 and theelectrode shielding cover 3 can effectively reduce interference of the outside on signals transmitted by themetal electrode lead 10, thereby enhancing the accuracy of detection.

Further, as shown in fig. 3, the inner diameter of thePLA fixing housing 1 is the same as the outer diameter of thenon-metal pipeline 15 to be measured, and specifically, in implementation, the inner diameter of thePLA fixing housing 1 is designed according to the outer diameter of thenon-metal pipeline 15, so that thePLA fixing housing 1 is completely attached to the outer wall of thenon-metal pipeline 15.

A non-metal pipeline dirt thickness detection method based on a capacitance method comprises the following steps:

s1, fixedly installing the detector on the outer wall of the nonmetal pipeline to be detected through a fixed screw detection device, connecting the capacitance sensor detector with a metal electrode lead connector, then connecting the LCR digital bridge detector with the capacitance sensor detector, and finally connecting the upper computer with the LCR digital bridge detector;

s2, acquiring and acquiring capacitance data information between metal electrode plates through a capacitance sensor detector and an LCR digital bridge detector;

and S3, quantitatively analyzing the capacitance data information by the upper computer and drawing a fitting curve graph between the non-metal pipeline dirt deposition thickness and the capacitance data information.

It should be noted that, the detection method is based on the principle that the change of the thickness of the dirt of the non-metal pipeline is detected by a capacitance method, the influence of the dielectric constant between themetal electrode plates 4 on the detection result is analyzed, the capacitance data information between themetal electrode plates 4 collected by the capacitance sensing detector is obtained by means of the LCR digital bridge measuring instrument, the multiple groups of capacitance data information are quantitatively analyzed by the upper computer, the fitting curve graph of the capacitance data and the dirt deposition result is drawn, the result is shown in the attached figure-7, and the obtained fitting curve graph shows that the capacitance value between themetal electrode plates 4 has linear correlation with the dirt thickness.

It should be further explained that the above embodiments are that the non-metal pipe dirt may include multiple and multiple types of complex media, and for different types of dirt, the detection may be performed according to the above method to obtain the corresponding fitting curve graph of the corresponding dirt media, and in the above embodiments, the detection result in fig. 7 is only the detection example of the PPR non-metal pipe with the outer diameter of 24.5mm and the inner diameter of 18.5 mm.

Referring to the attached drawings of 5 and 6, the main parameters affecting the detection sensitivity and accuracy of the capacitive sensor include the axial length d of themetal electrode plate 4 and the opening angle α of themetal electrode plate 4, the electric field steady state of the main parameters is researched and analyzed by using finite element simulation analysis software COMSOL, and the simulation data result shows that the larger the axial length of the metal electrode plate is, the more obvious the change of the corresponding dirt deposition thickness and capacitance value of the pipeline is, but the longer the capacitive electrode plate causes the 'spatial filtering effect' to make the detection of the capacitance change unresponsive, the too short electrode plate causes the capacitance value fluctuation to be too small to be easily captured, and the detection difficulty is increased, as shown in the attached drawing-8, the capacitance values corresponding to the electrode plates with different axial lengths are related to the dirt deposition, the larger the opening angle is, the relative area is also increased, the increase of the dirt thickness of the pipeline causes the larger capacitance value fluctuation, as shown in the attached drawing-9, the relationship of the capacitance values corresponding to the dirt deposition with the electrode plates with different opening angles is compared with the analysis result, and the symmetric curved surface of the sensor is optimally selected, and has the advantages.

In summary, the detection device and the detection method for detecting the thickness of the dirt in the non-metal pipeline based on the capacitance method have the characteristics of simple installation and convenient operation, simultaneously, the detection method starts from a mechanism of detecting the change of the thickness of the dirt in the non-metal pipeline by the capacitance method, analyzes the influence of the dielectric constant between themetal electrode plates 4 on a detection result, obtains capacitance data information collected by the detection device of the capacitance sensor by means of an LCR digital bridge measuring instrument, quantitatively analyzes the result through a large number of experiments, obtains the fitting corresponding relation between the capacitance data and the dirt deposition result, realizes the indirect measurement of the dirt thickness of the non-metal pipeline, has accurate measurement and high response speed, and can be widely applied to the dirt detection of the non-metal pipeline in a circulating water system in various places such as industrial production, domestic water, chemical experiments and.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (6)

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.

6. A non-metal pipeline dirt thickness detection method based on a capacitance method is characterized by comprising the following steps:

s1, fixedly installing the detector on the outer wall of the nonmetal pipeline to be detected through a fixed screw detection device, connecting the capacitance sensor detector with a metal electrode lead connector, then connecting the LCR digital bridge detector with the capacitance sensor detector, and finally connecting the upper computer with the LCR digital bridge detector;

s2, acquiring and acquiring capacitance data information between metal electrode plates through a capacitance sensor detector and an LCR digital bridge detector;

and S3, quantitatively analyzing the capacitance data information by the upper computer and drawing a fitting curve graph between the non-metal pipeline dirt deposition thickness and the capacitance data information.

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