Combined type water leakage point positioning sensor

Abstract

The invention relates to a combined type water leakage point positioning sensor. A moving coil sensor with good low-frequency characteristics and a vocal music guitar omnidirectional piezoelectric patch with good high-frequency characteristics are combined for use, the frequency response defect of a traditional single piezoelectric patch is made up, the piezoelectric patch adopts a single-arm cantilever structural design, a piezoelectric layer is driven to generate an electric signal through vibration deformation of a free end, and the piezoelectric effect is improved. The sensitivity of the piezoelectric patch to weak high-frequency signals can be effectively enhanced, the high-frequency effect of the omnidirectional piezoelectric patch of the vocal guitar can be played to the maximum efficiency, and the detection perception capability of the system in an indoor and outdoor pipe network water leakage detection scene is obviously improved, so that the success rate of leakage point detection is improved. Meanwhile, the support can be a magnetic or triangular support according to needs, so that the sensor can be magnetically attracted to the pipeline to be detected or stably placed on the ground, and the pickup effect is improved. The sensor is high in sound sensitivity and pure in sound quality, can pick up the sound of a water leakage point in a high-fidelity manner, and can be used in water leakage point detection related instruments such as a water leakage point positioning leakage listening instrument.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water leakage detection, in particular to a combined water leakage point positioning sensor. BACKGROUND

[0002] Currently, in the water leakage positioning industry of water supply pipelines, heating pipelines, fire pipelines, geothermal pipelines and other pressure pipelines, a conventional piezoelectric sheet is usually used as a pickup device in a leak detector and related devices. However, due to the various materials of underground pipelines, such as steel, cast iron, ductile cast iron, concrete, PVC and PE materials, different materials have different sound transmission attenuation characteristics. For example, the same water leakage vibration signal of the same sound source level in a steel pipeline and a cast iron pipeline has small loss and the water leakage sound is transmitted farther. The high-frequency sound attenuation coefficient of PE and PVC materials is large, resulting in a short transmission distance of the water leakage point sound. In addition, the underground soil filtering effect causes the sound wave from the long-distance water leakage point to the pickup probe to be mainly low-frequency. At the same time, with the development of leakage detection technology, the combination of indoor pressure and listening leakage also requires the pickup sensor to have a wider bandwidth. Based on the above new requirements of the leakage detection industry, a combined water leakage point positioning sensor is designed to meet the requirements of low-frequency and high-frequency of PE and PVC pipe leakage detection, and to meet the requirements of wideband and high sensitivity indoor pressure leakage detection. SUMMARY

[0003] In view of the problems existing in the prior art, the application discloses a combined water leakage point positioning sensor, which adopts the technical scheme that the shell body is made of stainless steel, a bottom cover is buckled and pressed on the lower end of the shell body, a support connecting piece is rotatably buckled and connected to the center position of the lower surface of the bottom cover, a support is fixedly connected to the lower end of the support connecting piece through a support screw, a moving coil sensor is buckled and inserted into the center hole of the upper surface of the bottom cover, a sensor support is buckled and pressed on the upper end of the moving coil sensor, a piezoelectric sheet is fixedly connected to the upper surface of the sensor support through a copper sleeve and a piezoelectric sheet screw, the piezoelectric sheet screw is fixed on the sensor support by being screwed through the mounting hole on the piezoelectric sheet and the center of the copper sleeve, a circuit board base is buckled and pressed on the upper part of the sensor support, the copper sleeve, the piezoelectric sheet screw and the piezoelectric sheet are located in the inner cavity at the bottom of the circuit board base, a signal amplification circuit board and a power supply circuit board are fixedly connected to the upper center of the circuit board base through a circuit board screw, the signal amplification circuit board and the power supply circuit board are arranged in an up-down mode and are electrically connected, and are supported and isolated through a circuit board isolation column, the circuit board isolation column is connected to the circuit board screw, a screw is sequentially screwed through the circuit board base, the sensor support and the bottom cover from top to bottom and is fixed on the bottom cover in a threaded mode, the moving coil sensor is clamped and fixed between the sensor support and the bottom cover, an upper cover is buckled and pressed on the upper end of the shell body, an aviation plug is fixedly inserted into the center of the upper cover, the aviation plug is electrically connected between the signal amplification circuit board and the power supply circuit board, the signal amplification circuit board is electrically connected between the moving coil sensor and the piezoelectric sheet, and the piezoelectric sheet is selected from a sound guitar omnidirectional piezoelectric sheet. The moving coil sensor has good low-frequency characteristics, the center frequency is 20Hz±2.5%, the frequency response range is 0-300Hz, and the sensitivity is 10-200v / m / s. The sound guitar omnidirectional piezoelectric sheet has a high sensitivity and a frequency response range of 2KHz-8KHz. The moving coil sensor and the sound guitar omnidirectional piezoelectric sheet are connected in parallel, the sum of the frequency responses of the two is the response frequency of the system, the high-sensitivity full-band covers a range of 10KHz, so that the system meets the wide-band response requirement.

[0004] As a preferred scheme of the application, the support is selected from a magnetic support or a triangular support.

[0005] As a preferred scheme of the application, the mounting hole is arranged at the edge of the piezoelectric sheet, the piezoelectric sheet is clamped and fixed on the upper end face of the copper sleeve through a piezoelectric sheet screw, the center of the piezoelectric sheet is suspended to form a single-arm cantilever installation structure.

[0006] The application combines the moving coil sensor with good low-frequency characteristics and the sound guitar omnidirectional piezoelectric sheet with good high-frequency characteristics, makes up for the frequency response defects of the traditional single piezoelectric sheet, and adopts the single-arm cantilever structure design for the piezoelectric sheet, drives the piezoelectric layer to generate an electric signal through the vibration deformation of the free end, can effectively enhance the sensitivity of the piezoelectric sheet to weak high-frequency signals, maximize the high-frequency effect of the sound guitar omnidirectional piezoelectric sheet, and obviously improve the detection and sensing ability of the system in the indoor and outdoor pipe network leakage detection scene, thereby improving the success rate of the leakage point detection. BRIEF DESCRIPTION OF DRAWINGS

[0007] Fig. 1 It is a half-section view of the overall structure of the application.

[0008] Fig. 2 It is an exploded view of the overall structure of the application.

[0009] Fig. 3 It is a schematic diagram of the overall structure of the application in the state of installing a triangular support.

[0010] Fig. 4 It is a schematic diagram of the piezoelectric sheet structure of the application.

[0011] In the figure: 1 is an outer shell, 2 is a bottom cover, 3 is a support connecting piece, 4 is a support screw, 5 is a support, 6 is a moving coil sensor, 7 is a sensor support, 8 is a copper sleeve, 9 is a piezoelectric sheet screw, 10 is a piezoelectric sheet, 1001 is a mounting hole, 11 is a circuit board base, 12 is a screw, 13 is a signal amplification circuit board, 14 is a power supply circuit board, 15 is a circuit board screw, 16 is a circuit board isolation column, 17 is an upper cover, and 18 is an aviation plug. DETAILED DESCRIPTION

[0012] Example 1

[0013] As Figs. 1 to 4As shown, the present application is a combined water leakage point positioning sensor, the bottom cover 2 is buckled and pressed on the lower end of the shell body 1, the support connecting piece 3 is rotatably buckled and connected to the center position of the lower surface of the bottom cover 2, the support 5 is fixedly connected to the lower end of the support connecting piece 3 through the support screw 4, the support 5 is selected from a magnetic support or a triangular support, the support 5 can be replaced by disassembling the support screw 4, the magnetic support can ensure that the sensor is adsorbed to the steel pipe pipeline to be measured, and the triangular support is conveniently and stably placed on the ground to detect the water leakage point of the underground water pipe. The moving coil sensor 6 is buckled and inserted into the center hole in the upper surface of the bottom cover 2, the sensor support 7 is buckled and pressed on the upper end of the moving coil sensor 6, the piezoelectric sheet 10 is supported and fixedly connected to the upper surface of the sensor support 7 through the copper sleeve 8 and the piezoelectric sheet screw 9, the piezoelectric sheet screw 9 is tightly fixed on the sensor support 7 by penetrating the mounting hole 1001 in the piezoelectric sheet 10 and the center of the copper sleeve 8, the mounting hole 1001 is arranged at the edge of the piezoelectric sheet 10, and the piezoelectric sheet 10 is clamped and fixed on the upper end surface of the copper sleeve 8 through the piezoelectric sheet screw 9, so that the center of the piezoelectric sheet 10 is suspended to form a single-arm cantilever mounting structure, and the copper sleeve 8 is in contact with the negative electrode of the piezoelectric sheet 10 and is connected with the negative electrode of the circuit system at the same time, so that the negative electrode of the piezoelectric sheet 10 is connected with the negative electrode of the circuit system. The single-arm cantilever mounting structure is fixed at one end and free at the other end, the piezoelectric layer of the piezoelectric sheet 10 is driven to generate an electric signal through the vibration deformation of the free end, the sensitivity of the piezoelectric sheet 10 to high-frequency weak signals can be effectively enhanced, and the detection success rate of the system can be improved.

[0014] The circuit board base 11 is pressed on the upper part of the sensor support 7, the copper sleeve 8, the piezoelectric sheet screw 9 and the piezoelectric sheet 10 are located in the inner cavity at the bottom of the circuit board base 11, the signal amplification circuit board 13 and the power supply circuit board 14 are fixedly connected to the center of the upper part of the circuit board base 11 through the circuit board screw 15, the signal amplification circuit board 13 and the power supply circuit board 14 are arranged in an up-down mode and are supported and isolated through the circuit board isolation column 16, the circuit board isolation column 16 penetrates the circuit board screw 15, the screws 12 are sequentially screwed and fixed on the bottom cover 2 from top to bottom by penetrating the circuit board base 11 and the sensor support 7, so that the moving coil sensor 6 is clamped and fixed between the sensor support 7 and the bottom cover 2, and the rigid connection between the moving coil sensor 6 and the bottom cover 2 is realized. The upper cover 17 is buckled and pressed on the upper end of the shell body 1, the aviation plug 18 is fixedly inserted into the center of the upper cover 17, the aviation plug 18 is a three-core plug, which is respectively a positive and negative power supply line and a signal line, the positive and negative power supply lines are connected with the power supply circuit board 14, the power supply circuit board 14 converts and stabilizes the voltage and supplies the signal amplification circuit board 13, the amplification signal line of the signal amplification circuit board 13 is connected with the signal line of the aviation plug 18, and the moving coil sensor 6 and the piezoelectric sheet 10 are connected in parallel to the signal amplification circuit board 13.

[0015] The shell 1 made of stainless steel has noise reduction protection effect on the moving coil sensor 6 and the piezoelectric sheet 10, and has anti-interference shielding effect on the signal amplification circuit board 13 and the power supply circuit board 14. The piezoelectric sheet 10 is selected as a sound guitar omnidirectional piezoelectric sheet. The moving coil sensor 6 has good low frequency characteristics, a center frequency of 20Hz±2.5%, a frequency response range of 0-300Hz, and a sensitivity of 10-200v / m / s. The sound guitar omnidirectional piezoelectric sheet has a frequency response range of 2KHz-8KHz and high sensitivity. The outdoor water leakage signal spectrum is 20Hz-1500Hz, and the indoor water leakage point is in the frequency spectrum range of 4000Hz-10000Hz under the condition of air pressure. The moving coil sensor 6 and the sound guitar omnidirectional piezoelectric sheet are connected in parallel, and the sum of the frequency responses of the two is the response frequency of the system, so that the system meets the wideband response requirement.

[0016] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application, in addition, the terms "first", "second" and the like are only for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, therefore, the features limited by "first", "second" and the like can be explicitly or implicitly included one or more, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0017] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements, for those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0018] The parts and circuit parts not described in detail herein are prior art.

[0019] Although the specific embodiments of the present application are described in detail above, the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application, and modifications or variations not having creative labor are still within the scope of the present application.

Claims

1. A combined leak point localization sensor, characterized in that, The application relates to an audio frequency sensor, which comprises an outer shell (1), a bottom cover (2) buckled and pressed on the lower end of the outer shell (1), a support connecting piece (3) rotatably buckled and connected with the center position of the lower surface of the bottom cover (2), a support (5) fixedly connected with the lower end of the support connecting piece (3) through a support screw (4), a moving coil sensor (6) buckled and inserted into the center hole of the upper surface of the bottom cover (2), a sensor support (7) buckled and pressed on the upper end of the moving coil sensor (6), a piezoelectric sheet (10) supported and fixedly connected with the upper surface of the sensor support (7) through a copper sleeve (8) and a piezoelectric sheet screw (9), the piezoelectric sheet screw (9) being fixed on the sensor support (7) by being screwed through the mounting hole (1001) on the piezoelectric sheet (10) and the center of the copper sleeve (8), a circuit board base (11) buckled and pressed on the upper part of the sensor support (7), the copper sleeve (8), the piezoelectric sheet screw (9) and the piezoelectric sheet (10) being located in the inner cavity of the bottom part of the circuit board base (11), a signal amplification circuit board (13) and a power supply circuit board (14) being fixedly connected with the center of the upper part of the circuit board base (11) through a circuit board screw (15), the signal amplification circuit board (13) and the power supply circuit board (14) being arranged in an up-down mode and being electrically connected, and being supported and isolated through a circuit board isolation column (16), the circuit board isolation column (16) being connected with the circuit board screw (15), a screw (12) being sequentially screwed and fixed on the bottom cover (2) from top to bottom through the circuit board base (11) and the sensor support (7), the moving coil sensor (6) being clamped and fixed between the sensor support (7) and the bottom cover (2), an upper cover (17) being buckled and pressed on the upper end of the outer shell (1), an aviation plug (18) being fixedly inserted into the center of the upper cover (17), the aviation plug (18) being electrically connected between the signal amplification circuit board (13) and the power supply circuit board (14), the signal amplification circuit board (13) being electrically connected between the moving coil sensor (6) and the piezoelectric sheet (10), and the piezoelectric sheet (10) being an acoustic guitar omnidirectional piezoelectric sheet.

2. A combined leak point location sensor according to claim 1, characterized in that: The outer shell (1) is made of stainless steel.

3. The combination leak point location sensor of claim 1, wherein: The support (5) is a magnetic support or a triangular support.

4. The combination leak point location sensor of claim 1, wherein: The mounting hole (1001) is arranged at the edge of the piezoelectric sheet (10), the piezoelectric sheet (10) is clamped and fixed on the upper end face of the copper sleeve (8) through the piezoelectric sheet screw (9), and the center of the piezoelectric sheet (10) is suspended to form a single-arm cantilever installation structure.

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