Turbidity detection device

Abstract

The utility model discloses a turbidity detection device which is characterized in that a turbidity sensor comprises a detection cavity, a transparent cavity wall arranged in the detection cavity, a detachable water inlet joint arranged at the lower end of the detection cavity, a detachable water outlet joint arranged at the upper end of the detection cavity, and a detachable sealing cover arranged at the top of the detection cavity, and the detection cavity is also provided with an infrared light source, a transmission light detection light path and a scattered light detection light path. The turbidity detection device has two working modes, namely an online measurement mode of directly connecting a pipeline to measure the turbidity and a portable measurement mode of placing a colorimetric bottle filled with liquid to be detected to measure the turbidity.

Description

Technical Field

[0001] The utility model relates to the technical field of turbidity detection, in particular to a turbidity detection device. Background Art

[0002] Turbidity refers to the degree of obstruction to the passage of light by a solution, including the scattering of light by suspended substances and the absorption of light by solute molecules, which is an optical property of a water sample. The turbidity of water is not only related to the content of suspended substances in the water, but also related to their size, shape, refractive index, etc. Turbidity detection is required in the water quality determination of natural water, drinking water and industrial water. Turbidity is a very important indicator reflecting the quality of water and an important sign indicating that the water may be polluted. Existing turbidity detection devices can be divided into on-line turbidity detection devices and portable turbidity detection devices. The on-line turbidity detection device can be connected to the pipeline for real-time measurement and data uploading, but it is not convenient to carry and cannot measure the turbidity of the liquid in the colorimetric flask; the portable turbidity detection device is convenient to carry and can measure the turbidity of the liquid in the colorimetric flask, but it can only measure the turbidity of the water sample in the pipeline by sampling measurement and cannot perform real-time measurement. In actual use scenarios, it often occurs that when a portable measurement is carried out at a certain sampling point and the turbidity is found to be abnormal, continuous measurement of this sampling point is required. If the existing portable turbidity detection system is used, the measurement personnel need to continuously monitor repeatedly, while if on-line measurement is used, a new on-line measurement system needs to be installed for this sampling point, resulting in increased costs. Summary of the Utility Model

[0003] In view of the above problems, the utility model provides a turbidity detection device to solve the problems of the existing turbidity sensor system that cannot achieve on-line turbidity detection and portable turbidity detection in a set of systems, resulting in a reduced scope of application and inconvenient on-site display.

[0004] A turbidity detection device includes a turbidity sensor, and the turbidity sensor is composed of the following parts:

[0005] A detection cavity;

[0006] A transparent cavity wall installed inside the detection cavity;

[0007] A detachable water inlet joint provided at the lower end of the detection cavity;

[0008] A detachable water outlet joint provided at the upper end of the detection cavity;

[0009] A detachable cover provided at the top of the detection cavity;

[0010] An infrared light source, a plano-convex lens, a transmitted light detection optical path and a scattered light detection optical path are further provided on the detection cavity;

[0011] The transmitted light detection optical path includes a transmitted light detection phototube, which is located on the extension line of the connection line between the center point of the infrared light source and the cross-section center point of the detection cavity;

[0012] The scattered light detection optical path further includes a scattered light detection phototube, which is located at the intersection of the vertical plane at the cross-section center point of the connection line between the center point of the infrared light source and the cross-section center point of the detection cavity and the outer surface of the detection cavity.

[0013] Further, the included angle formed by the connection line between the scattered light detection phototube and the cross-section center point of the detection cavity and the horizontal cross-section of the detection cavity is between 25° and 35°.

[0014] Further, the plano-convex lens is fixed on the extension line of the emission direction of the infrared light source in the detection cavity through a groove.

[0015] Further, a water collecting tank and a transparent cavity wall fixing groove are arranged inside the detection cavity.

[0016] Further, the water inlet joint is provided with an external thread, one end of the water collecting tank that cooperates with it is provided with an internal thread, the water outlet joint is provided with an external thread, and one end of the detection cavity that cooperates with it is provided with an internal thread.

[0017] Further, the turbidity detection device further includes:

[0018] An adjustable constant current drive circuit for providing a stable and adjustable drive current for the infrared light source;

[0019] A photoelectric conversion circuit for converting the obtained transmitted light intensity and scattered light intensity into voltage values;

[0020] An amplification circuit and a filtering circuit connected thereto for amplifying and filtering the converted transmitted light voltage signal and scattered light voltage signal;

[0021] An analog-to-digital conversion circuit for converting the amplified and filtered transmitted light voltage signal and scattered light voltage signal into digital signals;

[0022] A power supply circuit for supplying power to each electrical circuit;

[0023] A microprocessor, which is connected to the above circuits for information processing.

[0024] Further, two wires led out from the infrared light source of the turbidity sensor are connected to the microprocessor, and three wires led out from the transmitted light detection phototube and the scattered light detection phototube respectively are connected to the microprocessor.

[0025] Further, the turbidity detection device further includes a wireless module connected to the microprocessor, which is used to upload the turbidity value obtained by the microprocessor to the cloud server through the Internet interface.

[0026] Further, the inner diameter of the inner wall of the transparent cavity wall is 1-10 mm larger than the outer diameter of the turbidity detection colorimetric bottle.

[0027] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0028] In the technical solution provided by the embodiment of the present application, a transparent cavity wall with an inner diameter larger than the diameter of the colorimetric bottle placed therein is fixed in the detection cavity of the turbidity sensor. A colorimetric bottle filled with a liquid to be measured can be placed, or a pipeline to be measured can be connected to the water inlet joint and the water outlet joint. The turbidity sensor designed in this way can perform portable turbidity detection after placing the colorimetric bottle, and can also be connected to the pipeline to be measured for online turbidity detection, expanding the application range of the turbidity sensor, realizing the switching between the online turbidity detection and the portable detection functions of a set of turbidity sensor system, and uploading the detection data to the cloud server through the wireless module, which is convenient for users to operate and view.

[0029] The above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic three-dimensional structure diagram of the turbidity sensor shown in the embodiment of the present application;

[0031] Figure 2 It is a schematic sectional structure diagram of the turbidity sensor shown in the embodiment of the present application;

[0032] Figure 3 It is an optical path diagram of the turbidity sensor shown in the embodiment of the present application;

[0033] Figure 4 It is a schematic structure diagram of the turbidity detection device shown in the embodiment of the present application;

[0034] Figure 5 It is a schematic block diagram of the circuit connection relationship of the turbidity detection device shown in the embodiment of the present application;

[0035] Figure 6 It is a working flow chart of the turbidity detection device shown in the embodiment of the present application.

[0036] In the figure:

[0037] Turbidity sensor 1, touch display screen 2, wireless module 3, microprocessor 4;

[0038] Cover 10, detection cavity 11, infrared light source 12, scattered light detection phototube 13, water inlet joint 14, transmitted light detection phototube 15, water outlet joint 16, transparent cavity wall 17, plano-convex lens 18, transparent cavity wall fixing groove 19, water collection tank 20, lower gasket 21, upper gasket 22, transmitted light detection optical path 23, scattered light detection optical path 24, liquid to be measured 25. Detailed implementation mode

[0039] The following further elaborates in detail on a turbidity detection device of the present utility model in conjunction with the accompanying drawings and specific embodiments. When the following description involves the accompanying drawings, the same numerals in different drawings represent the same or similar elements. The implementation modes described in the following exemplary embodiments do not represent all implementation modes consistent with the present application. The examples are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. Embodiment

[0040] As Figure 1 shown, the embodiment of the present utility model provides a turbidity detection device. The internal turbidity sensor mainly includes a detection cavity 11. Inside the detection cavity 11, a water collection tank 20 and a transparent cavity wall fixing groove 19 are provided. A water inlet joint 14 is detachably provided below the water collection tank 20, and a water outlet joint 16 is detachably provided on the upper side of the detection cavity 11. The transparent cavity wall 17 is inserted into the detection cavity 11 and fixed by the transparent cavity wall fixing groove 19. A lower gasket 21 and an upper gasket 22 are tightly fixed between the transparent cavity wall 17 and the detection cavity 11. The detachable connection methods between the water inlet joint 14 and the water collection tank 20 and between the water outlet joint 16 and the detection cavity 11 can both be through internal and external thread mating connections. For example, according to Figure 2 the structure shown in the sectional view, the water inlet joint 14 includes an external thread, one end of the water collection tank 20 that mates with it includes an internal thread. At the same time, the water outlet joint 16 includes an external thread, and one end of the detection cavity 11 that mates with it also includes an internal thread. The threaded connection can make the entire cavity form a flow cell with good joint sealing. A detachable cover 10 is provided at the top of the detection cavity 11. The cover 10 serves as a light shield to prevent external light from entering in the portable turbidity detection mode and serves as a component of the flow cell to prevent the liquid to be measured from overflowing in the on-line turbidity detection mode.

[0041] An infrared light source 12 is provided on one side of the detection cavity 11. The detection cavity 11 is provided with a plano-convex lens 18 fixed by a groove and located on the extension line of the emission direction of the infrared light source 12. The detection cavity 11 is also provided with a transmitted light detection optical path 23 and a scattered light detection optical path 24. When the turbidity sensor operates in the portable turbidity detection mode, a colorimetric bottle containing the liquid to be measured 25 is placed inside it; when the turbidity sensor operates in the on-line turbidity detection mode, its internal flow cell is filled with the liquid to be measured 25.

[0042] Specifically, the diameter of the transparent cavity wall 17 is 27 mm. That is, the inner diameter of the transparent cavity wall 17 is larger than the outer diameter of the commonly used 25 mm turbidity detection colorimetric bottle, so that the turbidity detection colorimetric bottle can be directly placed into the detection cavity 11 fixed with the transparent cavity wall 17.

[0043] As Figure 3 shown, in a possible implementation manner, the transmitted light detection optical path 23 includes a transmitted light detection phototube 15. The transmitted light detection phototube 15 is located on the extension line of the connection line between the center point of the infrared light source 12 and the center point of the cross-section of the detection cavity 11, and is fixed to the detection cavity 11 by screws.

[0044] In a possible implementation manner, the scattered light detection optical path 24 includes a scattered light detection phototube 13. The scattered light detection phototube 13 is located at the intersection of the vertical plane at the center point of the cross-section of the detection cavity 11 of the connection line between the center point of the infrared light source 12 and the center point of the cross-section of the detection cavity 11 and the outer surface of the detection cavity 11, and the included angle formed by the connection line between the scattered light detection phototube 13 and the center point of the cross-section of the detection cavity and the horizontal cross-section of the detection cavity is 30°, and is fixed to the detection cavity 11 by screws.

[0045] The working principle of the above turbidity sensor is as follows:

[0046] Based on the nephelometry method, the light emitted by the infrared light source passes through the liquid to be measured and then undergoes transmission and scattering. Within a certain range, the ratio of the transmitted light intensity to the scattered light intensity has an approximate linear relationship with the turbidity value of the liquid to be measured. Therefore, by detecting the intensities of the transmitted light and the scattered light generated by passing through the liquid to be measured, and calculating the ratio of the transmitted light intensity to the scattered light intensity, the turbidity value of the liquid to be measured can be measured.

[0047] In addition, on the basis of the above solution, the present application also provides a turbidity sensor system. Through this system, the working mode of the turbidity sensor can be switched, and the detection value of the turbidity sensor can be processed and displayed on the touch display screen or uploaded to the cloud server.

[0048] As Figure 4 shown, the turbidity detection device includes the turbidity sensor 1 of the foregoing embodiment, a microprocessor 4 connected to the turbidity sensor 1, a touch display screen 2, and a wireless module 3.

[0049] In specific applications, two wires are led out from the infrared light source 12 of the turbidity sensor 1 and connected to the system microprocessor 4. Three wires are respectively led out from the transmitted light detection phototube 15 and the scattered light detection phototube 13 and connected to the microprocessor 4. One usage method is to remove the detachable water inlet joint 14 and the water outlet joint 16, put the colorimetric bottle filled with the liquid to be measured into the detection cavity, and the microprocessor 4 can obtain the transmitted light intensity and scattered light intensity of the turbidity sensor 1, and perform a series of processes on them according to the portable measurement parameters to obtain the turbidity data, which is then displayed by the touch display screen 2; Another usage method is to fixedly install the detachable water inlet joint 14 on the water collecting tank 20, and fixedly install the water outlet joint 16 on the detection cavity 11, and connect the pipeline to be measured to the water inlet joint 14 and the water outlet joint 16. Thus, the microprocessor 4 can obtain the transmitted light intensity and scattered light intensity of the turbidity sensor 1, and perform a series of processes on them according to the on-line measurement parameters to obtain the turbidity data, and the wireless module 3 uploads the turbidity data to the cloud server.

[0050] Combined with Figure 5 , the circuit structure of the turbidity detection device provided by the present application is described. As Figure 5 shown, the turbidity detection device mainly includes:

[0051] A turbidity sensor set according to one of the two usage methods given in the foregoing embodiments;

[0052] A power supply circuit for supplying power to each electrical circuit;

[0053] An adjustable constant current drive circuit for providing a stable and adjustable drive current for the infrared light source;

[0054] A photoelectric conversion circuit for converting the obtained transmitted light intensity and scattered light intensity into voltage values;

[0055] An amplifier circuit and a filtering circuit connected thereto for amplifying and filtering the converted transmitted light voltage signal and scattered light voltage signal;

[0056] An analog-to-digital conversion circuit for converting the amplified and filtered transmitted light voltage signal and scattered light voltage signal into digital signals that can be read and processed by the microprocessor;

[0057] A microprocessor is used to set the drive current value of the adjustable constant current drive circuit according to the parameter requirements of one of the two usage modes in the foregoing embodiments. At the same time, according to the parameter requirements of one of the two usage modes in the foregoing embodiments, it calculates the turbidity value based on the transmitted light voltage signal and the scattered light voltage signal after analog-to-digital conversion, and displays it through a touch display screen. In specific implementation, circuit structures such as the power supply circuit, adjustable constant current drive circuit, photoelectric conversion circuit, amplification circuit, filtering circuit, analog-to-digital conversion circuit, and microprocessor can be integrated on a circuit board.

[0058] A wireless module is used to upload the turbidity value calculated by the microprocessor to the cloud server through an Internet interface. In specific implementation, an ESP32 wireless module can be used to access the Internet via Wi-Fi, so as to upload data to the cloud server.

[0059] As Figure 6 shown, the turbidity detection device has two working modes. In the portable turbidity measurement mode, the water inlet joint and the water outlet joint should be removed. When the instrument has not been calibrated or the calibration error is greater than the allowable range, the calibration process needs to be carried out. When the calibration has been completed and the calibration error is less than the allowable range, a colorimetric bottle containing the liquid to be measured is placed in the detection cavity for turbidity detection. After the detection is completed, the turbidity value of the measured liquid is displayed on the touch display screen, and the wireless module uploads the turbidity detection value to the cloud server. In the online turbidity measurement mode, the water inlet joint and the water outlet joint should be installed. When the instrument has not been calibrated or the calibration error is greater than the allowable range, the calibration process needs to be carried out. When the calibration has been completed and the calibration error is less than the allowable range, the pipeline to be measured is connected to the water inlet joint and the water outlet joint, and the liquid in the pipeline to be measured is introduced into the detection cavity for turbidity detection. The turbidity detection system runs continuously and the turbidity value of the measured liquid is displayed on the touch display screen, and the wireless module uploads the turbidity detection value to the cloud server. In the above work process, the calibration method can be implemented with reference to the calibration part of the work flow chart.

[0060] It can be understood that the same or similar parts in the above embodiments can be referred to each other, and the content not detailed in some embodiments can be referred to the same or similar content in other embodiments.

[0061] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0062] The above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A turbidity detection device, comprising a turbidity sensor, characterized in that, The turbidity sensor consists of the following parts: Detection cavity; Transparent cavity wall, installed inside the detection cavity; Detachable water inlet joint, set at the lower end of the detection cavity; Detachable water outlet joint, set at the upper end of the detection cavity; Detachable cover, set at the top of the detection cavity; An infrared light source, a plano-convex lens, a transmitted light detection optical path, and a scattered light detection optical path are also provided on the detection cavity; The transmitted light detection optical path includes a transmitted light detection phototube, and the transmitted light detection phototube is located on the extension line of the connection line between the center point of the infrared light source and the center point of the cross-section of the detection cavity; The scattered light detection optical path further includes a scattered light detection phototube, and the scattered light detection phototube is located at the intersection of the vertical plane at the center point of the cross-section of the detection cavity of the connection line between the center point of the infrared light source and the center point of the cross-section of the detection cavity and the outer surface of the detection cavity.

2. The turbidity detection device according to claim 1, wherein, The included angle formed by the connection line between the scattered light detection phototube and the center point of the cross-section of the detection cavity and the horizontal cross-section of the detection cavity is between 25° and 35°.

3. The turbidity detection device according to claim 1 or 2, characterized in that, The plano-convex lens is fixed in the detection cavity on the extension line of the emission direction of the infrared light source through a groove.

4. The turbidity detection device according to claim 3, wherein A water collecting tank and a transparent cavity wall fixing groove are arranged inside the detection cavity.

5. The turbidity detection device according to claim 4, characterized in that, The water inlet joint is provided with an external thread, one end of the water collecting tank that cooperates with it is provided with an internal thread, the water outlet joint is provided with an external thread, and one end of the detection cavity that cooperates with it is provided with an internal thread.

6. The turbidity detection device according to claim 5, wherein, The turbidity detection device further includes: An adjustable constant current drive circuit for providing a stable and adjustable drive current for the infrared light source; A photoelectric conversion circuit for converting the obtained transmitted light intensity and scattered light intensity into voltage values; An amplifier circuit and a filtering circuit connected thereto for amplifying and filtering the converted transmitted light voltage signal and scattered light voltage signal; An analog-to-digital conversion circuit for converting the amplified and filtered transmitted light voltage signal and scattered light voltage signal into digital signals; A power supply circuit for supplying power to each electrical circuit; A microprocessor, connected to the above circuits for information processing.

7. The turbidity detection device according to claim 6, characterized in that, Two wires led out from the infrared light source of the turbidity sensor are connected to the microprocessor, and three wires respectively led out from the transmitted light detection phototube and the scattered light detection phototube are connected to the microprocessor.

8. The turbidity detection device according to claim 7, characterized in that, The turbidity detection device further includes a wireless module connected to the microprocessor for uploading the turbidity value obtained by the microprocessor to the cloud server through an Internet interface.

9. The turbidity detection device according to claim 1, wherein, The inner wall diameter of the transparent cavity wall is 1 - 10 mm larger than the outer diameter of the turbidity detection colorimetric bottle.

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