Turbidity sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a turbidity sensor, which comprises a shell, a detection control integrated circuit, a photosensitive element and a light source, an inclined detection surface is arranged on one side of the lower end surface of the lower part of the shell, and an inclined upward diagonal plane is formed by the lower end surface of the shell and one side of the shell; a light-transmitting through hole for a light source to emit light beams downwards and a light-sensing through hole for light beams to enter the light-sensing element are correspondingly formed in the detection surface, and a light-transmitting lens for sealing and isolating the light-transmitting through hole and the light-sensing through hole is arranged at the position, corresponding to the light-transmitting through hole and the light-sensing through hole, of the detection surface; and the photosensitive element and the light source are respectively and electrically connected with a detection control integrated circuit arranged above the photosensitive element. According to the turbidity sensor disclosed by the utility model, the influence of adhesive impurities on turbidity detection is avoided, and the accuracy of turbidity detection is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field, concretely relates to a turbidity sensor. BACKGROUND

[0002] With the improvement of people's living standards, and the deepening of the relationship between drinking water and health research, people's demand for drinking water quality is also improving. Turbidity is a characteristic parameter of water optical properties, it is not only one of the important indicators to measure the degree of water quality, but also an important basis for evaluating water treatment effect, therefore, online detection of water turbidity has very important practical significance.

[0003] Due to the presence of suspended solids and other substances in water, the water body presents an opaque state, and the turbidity sensor is used to measure the turbidity of the water body. When a beam of incident light enters the water, due to the presence of suspended solids in the water, optical scattering phenomenon occurs on the suspended solids, and the value of turbidity is determined according to the intensity of scattered light in the water, which is the principle of turbidity measurement.

[0004] Therefore, turbidity sensors are widely used in water detection field, but the existing turbidity sensors will be gradually covered with scale and microorganisms on the lens of the signal sending end and receiving end of the sensor due to long-term work in turbid water, resulting in ineffective transmission of optical signals, thereby causing the sensor to gradually fail and lose the ability to accurately detect turbidity, resulting in the service life of the turbidity sensor being much lower than the whole machine life.

[0005] Therefore, some turbidity sensors with self-cleaning function appear in the prior art, for example, Chinese patents with publication numbers CN201583496U and CN201765185U disclose a turbidity sensor using ultrasonic waves to clean the sensor lens. Although this sensor realizes self-cleaning of the turbidity sensor, when starting the ultrasonic wave to clean the impurities attached to the detection surface during turbidity detection of the water body, the ultrasonic wave is easy to form bubbles in the water body, and the bubbles are more likely to attach to the detection surface, thereby affecting the refraction and scattering of incident light, thereby affecting the detection accuracy of the turbidity sensor. At the same time, the ultrasonic self-cleaning is expensive, resulting in a significant increase in cost.

[0006] For example, the publication number CN211652539U China patent discloses a turbidity sensor using a cleaning device to clean the sensor probe, the sensor passes through the cleaning device including driving mechanism and cleaning brush, the driving mechanism is arranged in the packaging shell, the cleaning brush is arranged below the probe, and the bristles are arranged upward to the probe, the driving shaft of the driving mechanism passes through the probe downward and is in transmission connection with the cleaning brush, and drives the cleaning brush to rotate in the horizontal plane, so as to realize the cleaning function. However, the downward extending driving shaft drives the cleaning brush, which can reduce the sealing of the sensor, cause the internal circuit of the sensor to short circuit, and further affect the performance of the sensor.

[0007] In addition, the existing turbidity sensor measurement is based on the 90° scattering light principle. However, in actual use, the light of the turbidity detection light source of the turbidity sensor diverges outward at a certain angle, so that part of the light source cannot be well reflected back to the light source receiver, and the reflected light source also deviates at a certain angle, so that it cannot be received by the light source receiver, thereby reducing the detection accuracy of the turbidity sensor. Practical new type content

[0008] In view of the above problems of the prior art, the purpose of the present application is to provide a turbidity sensor with self-cleaning function, so as to avoid the influence of adherent impurities on turbidity detection and improve the accuracy of turbidity detection.

[0009] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0010] A turbidity sensor, comprising a housing, a detection control integrated circuit, a photosensitive element and a light source, wherein one side of the lower end face of the lower part of the housing has an inclined detection surface, so that the lower end face of the housing and one side of the housing form an inclined chamfer surface upwardly;

[0011] The detection surface is provided with a light transmission hole corresponding to the downward light beam of the light source and a photosensitive hole for the light beam to enter the photosensitive element, and the detection surface is provided with a light transmission lens for sealing and isolating the light transmission hole and the photosensitive hole at positions corresponding to the light transmission hole and the photosensitive hole. The photosensitive element and the light source are respectively electrically connected with the detection control integrated circuit arranged above the photosensitive element.

[0012] In use of the utility model, the lower part of the shell is immersed in the water body to be measured, the light beam emitted by the light source is shot into the water body to be measured through the light guide column, the impurities in the water body to be measured scatter the shot light beam, the scattered light is scattered to the photosensitive element at a certain angle, at this time, the light guide column at the photosensitive through hole guides the scattered light to the photosensitive element, so that the light beam is uniformly distributed on the photosensitive element, and the photosensitive element transmits the sensed light signal to the detection control integrated circuit, that is, the turbidity detection of the water body to be measured is completed.The lower end face of the lower part of the shell has a detection surface which is obliquely cut relative to the other side, so that the lower end face of the shell and one side of the shell form an oblique cutting surface upward.Compared with the prior art, the fluid buoyancy and shear force generated when the water body flows through the sensor can more effectively carry away the adhered particles, reduce the impurity accumulation, thereby helping to reduce the adhesion of suspended impurities in the water body on the sensor oblique cutting surface, thereby reducing the measurement error.

[0013] Preferably, an inner embedded step recessed towards the inside of the detection surface is arranged at the position corresponding to the photosensitive through hole and the light transmission through hole on the detection surface, the area shape of the inner embedded step matches the shape of the light transmission lens, the light transmission lens is sealingly installed at the inner embedded step, and the outer surface of the light transmission lens can be flush with the surface of the detection surface when the light transmission lens is installed at the inner embedded step.

[0014] In this way, the sealing property of the turbidity sensor is increased by the close cooperation of the inner embedded step and the light transmission lens, preventing the water body from invading the inside of the sensor, protecting the internal photosensitive element, the detection control integrated circuit and the light path from being damaged; at the same time, since the outer surface of the light transmission lens is flush with the surface of the detection surface, the water body to be measured can flow more smoothly through the light transmission lens, and the impurities in the water body to be measured are not easy to adhere to the detection surface or the light transmission lens, so that the scattering of the light source of the turbidity sensor can be avoided from being affected, in addition, the light transmission lens is flush with the detection surface, which can reduce the scattering and reflection of light between the detection surfaces, thereby improving the light transmission rate and the accuracy of the light signal.

[0015] Preferably, the light source has a mounting surface on one side of the central axis of the light beam shot out through the light transmission through hole, a baffle is fixedly installed on the mounting surface, a flow guide groove parallel to the detection surface is formed in the end face of the baffle facing the detection surface, and the flow guide groove and the detection surface have a spacing; a transversely penetrating interface is formed on the side of the lower part of the shell away from the mounting surface, a long strip-shaped flow guide opening is formed in the bottom of the interface, and when the baffle is positioned and installed on the mounting surface, the flow guide opening at the interface and the flow guide groove at the baffle are communicated to form a flow guide channel.

[0016] Thus, the cleaning direction is controlled by the baffle arranged on the mounting surface to be inclined upward along the detection surface, and the flow guide groove is arranged in parallel with the detection surface and has a spacing, the flow guide channel formed by the flow guide opening at the interface and the flow guide groove at the baffle allows the cleaning medium to pass through the channel to clean the detection surface of the sensor, so that the cleaning medium sprayed by the flow guide groove can clean the detection surface exactly, thereby removing the particulate matter adhered to the detection surface and reducing the impurity accumulation, thereby reducing the influence of the suspended impurities in the water body to be measured on the detection result due to adhesion to the detection surface of the sensor.

[0017] Preferably, the mounting surface is provided with a threaded hole, and the baffle is provided with a through hole at a position corresponding to the threaded hole, and the baffle is positioned and mounted on the mounting surface by aligning the through hole with the threaded hole and using a screw.

[0018] Thus, the baffle is convenient to install or dismount and replace.

[0019] Preferably, the cleaning device is further provided with an outer thread at the mounting position, the cleaning device is mounted on the interface through a connecting component, the connecting component is fixedly mounted at the interface, the connecting component is threadedly matched with the outer thread on the cleaning device to provide locking force, and the cleaning device is electrically connected with the detection control integrated circuit.

[0020] Thus, the installation of the cleaning device and the interface is realized by using the detachable connecting component, the wear of the interface and the cleaning device during repeated installation and dismounting is reduced, and the durability of the turbidity sensor is improved. In a specific application embodiment, the interface can be provided with an inner thread 121 to be threadedly matched with the connecting component, or the connecting component and the interface can be directly connected by using an adhesive.

[0021] When the turbidity sensor is cleaned, the detection integrated circuit controls the start of the cleaning device, the cleaning medium sprayed by the cleaning device passes through the flow guide channel to move obliquely upward to clean the detection surface and remove the pollutants adhered to the detection surface. Compared with the cleaning brush used in the prior art to clean the detection surface, the connection between the cleaning brush and the shell can easily cause the sealing performance of the sensor to be reduced, the internal circuit of the sensor to be short-circuited, and the performance of the sensor to be affected. In the present scheme, the cleaning device is arranged at the lower part of the shell, is fixedly mounted on the interface through the connecting component, is threadedly matched with the connecting component through the outer thread of the cleaning device to be mounted on the interface, the cleaning medium sprayed by the cleaning device passes through the flow guide channel to clean the detection surface, such a design ensures the sealing performance of the turbidity sensor, improves the detection accuracy of the turbidity sensor, and enables the turbidity sensor to be resistant to high pressure, so that the turbidity sensor can be used for high-pressure or deep-water measurement, and the detachable cleaning device can adapt to turbidity detection in different environments to improve the applicability of the turbidity sensor.

[0022] Preferably, the central axis of the photosensitive through hole and the central axis of the light beam emitted by the light source intersect at less than 90°.

[0023] Thus, the turbidity sensor measurement in the prior art is all away from 90° scattered light, however, in actual use, the light beam of the turbidity detection light source of the turbidity sensor is diverged at a certain angle, thus, part of the light source cannot be well reflected back to the photosensitive element, and through the optimization of the light path in the utility model, the utilization rate of the light beam can be improved, thereby improving the accuracy of the turbidity sensor.

[0024] Preferably, the front end of the photosensitive through hole and the light transmission through hole is provided with a light guide column, one end of the light guide column close to the detection surface is an inclined polished surface, and the inclined polished surface and the detection surface are a plane.

[0025] Thus, the light source scattered in the water body to be measured is reflected to the photosensitive element at a certain angle, which cannot be received by the photosensitive element, thereby reducing the detection accuracy of the turbidity sensor.

[0026] Preferably, the light transmission lens is made of quartz glass.

[0027] Thus, the quartz glass can well transmit light, so that the photosensitive element can better sense the light scattered by impurities in the water body to be measured, which is beneficial to improve the detection effect of the turbidity sensor, thereby improving the use effect of the turbidity sensor.

[0028] Preferably, the signal output end of the detection control integrated circuit is electrically connected with a signal output line for being connected with an external device, the upper part of the shell is provided with a wire outlet hole, and the signal output line is led out from the upper part of the shell through the wire outlet hole.

[0029] Thus, the signal output line is led out from the wire outlet hole in the upper part of the shell, thereby helping to protect the cable, and improving the sealing property and waterproof performance of the turbidity sensor.

[0030] The technical scheme of the utility model has the following beneficial effects:

[0031] (1) The turbidity sensor of the utility model adopts unique structure design, the lower end face of the shell has the detection surface of oblique cutting, the detection surface of the turbidity sensor has an oblique cutting surface, the fluid buoyancy and shear force generated when the water flows through the sensor can effectively take away the adhered particles, reduce the impurity accumulation, thereby helping to reduce the adhesion of suspended impurities in the water on the sensor oblique cutting surface; at the same time, the oblique cutting surface is an open space, compared with the turbidity detector of the prior art, the detection part is a limited space, the utility model is more convenient when cleaning, thereby reducing the measurement error.

[0032] (2) The utility model discloses a light guide column is designed at the light transmission hole and the photosensitive hole, can effectively guide the light beam of light source to the photosensitive element, thereby reducing the loss of light in the transmission process, and can help to realize the uniform distribution of light beam on the photosensitive element, improve the accuracy and reliability of turbidity sensor detection.

[0033] (3) The utility model discloses a baffle and the cleaning device installed at the interface realize the cleaning of turbidity sensor, the flow guide channel formed by the flow guide groove of baffle and the flow guide hole of interface can control the direction of the cleaning medium of cleaning device and can be along the detection surface oblique upward, thereby removing the particles adhered to the detection surface, reducing the impurity accumulation, thereby reducing the influence of the adhesion of suspended impurities in the water on the detection surface of the sensor on the detection result; at the same time, when installing the cleaning device, the connecting part is used to realize the installation of the cleaning device and the interface, reduces the abrasion when repeatedly installing and disassembling the interface and the cleaning device, increases the durability of turbidity sensor. DRAWINGS

[0034] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be further described in detail below with the drawings, wherein:

[0035] Figure 1 It is the sectional view of the turbidity sensor in the embodiment;

[0036] Figure 2 It is the detection surface structure plan view of the turbidity sensor in the embodiment;

[0037] Figure 3 It is the sectional view of the turbidity sensor of the embodiment and adopts elbow air blowing;

[0038] Figure 4 It is the detection surface structure schematic drawing of the turbidity sensor of the embodiment and adopts elbow air blowing;

[0039] Figure 5 It is the interface schematic drawing of the turbidity sensor of the embodiment and does not install the connector;

[0040] The reference signs in the drawings of the specification include: 1 - housing; 2 - light source; 21 - light transmission hole; 3 - detection surface; 4 - baffle; 41 - flow guide groove; 5 - photosensitive element; 6 - detection control integrated circuit; 7 - light guide column; 8 - light transmission lens; 9 - mounting surface; 10 - screw; 11 - cleaning device; 12 - interface; 121 - internal thread; 122 - flow guide opening. DETAILED DESCRIPTION

[0041] The following will be further described in detail through specific embodiments:

[0042] Embodiment:

[0043] In this embodiment, a turbidity sensor is disclosed, as shown in Figure 1 and Figure 2 , which comprises a housing 1, a detection control integrated circuit 6, a photosensitive element 5 and a light source 2, wherein one side of the lower end surface of the lower part of the housing 1 has an oblique detection surface 3, so that the lower end surface of the housing 1 and one side of the housing 1 form an oblique chamfer.

[0044] The detection surface 3 is provided with a light transmission hole 21 corresponding to the downward light beam emitted by the light source 2 and a photosensitive hole through which the light beam is incident on the photosensitive element 5, and the detection surface 3 is provided with a light transmission lens 8 for sealing and isolating the light transmission hole 21 and the photosensitive hole; the photosensitive element 5 and the light source 2 are respectively electrically connected with the detection control integrated circuit 6 arranged above the photosensitive element 5.

[0045] In this embodiment, when in use, the lower part of the housing 1 is immersed in the water body to be measured, and the light beam emitted by the light source 2 is incident on the water body to be measured through the light guide column 7, and the impurities in the water body to be measured scatter the incident light beam, and the scattered light is scattered at a certain angle to the photosensitive element 5, at this time the light guide column 7 at the photosensitive hole guides the scattered light to the photosensitive element 5, so that the light beam is uniformly distributed on the photosensitive element 5, and the photosensitive element 5 transmits the sensed light signal to the detection control integrated circuit 6, that is, the turbidity detection of the water body to be measured is completed. In this scheme, one side of the lower end surface of the lower part of the housing 1 has an oblique chamfer relative to the other side, so that the lower end surface of the housing 1 and one side of the housing 1 form an oblique chamfer. Compared with the prior art, the structure of the chamfer can more effectively carry away the adhered particles generated by the fluid buoyancy and shear force when the water body flows through the sensor, reduces the accumulation of impurities, thereby helping to reduce the adhesion of suspended impurities in the water body on the chamfer of the sensor, thereby reducing the measurement error.

[0046] In specific embodiments, the detection surface 3 is provided with an inner recessed step at the position corresponding to the light-transmitting through hole 21, the shape of the inner recessed step area matches the shape of the light-transmitting lens 8, the light-transmitting lens 8 is sealedly installed at the inner recessed step, and the outer surface of the light-transmitting lens 8 is flush with the surface of the detection surface 3 when the light-transmitting lens 8 is installed at the inner recessed step.

[0047] In this way, the sealing of the turbidity sensor is increased by the close cooperation of the inner recessed step and the light-transmitting lens 8, preventing water from entering the inside of the sensor and protecting the internal light-sensing element 5, the detection control integrated circuit 6, and the light path from being damaged. At the same time, since the outer surface of the light-transmitting lens 8 is flush with the surface of the detection surface 3, the water to be measured can flow more smoothly through the light-transmitting lens 8, and impurities in the water to be measured are less likely to adhere to the detection surface 3 or the light-transmitting lens, thereby avoiding the scattering of the light source 2 of the turbidity sensor from being affected. In addition, the light-transmitting lens 8 is flush with the detection surface, which can reduce the scattering and reflection of light between the detection surface 3, thereby improving the light transmission rate and the accuracy of the optical signal.

[0048] In specific embodiments, as shown in Figures 3 to 5 the light source 2 has a mounting surface 9 on the side of the central axis of the light beam emitted through the light-transmitting through hole 21, the mounting surface 9 is fixedly provided with a baffle 4, the baffle 4 is provided with a flow guide groove 41 parallel to the detection surface 3 at the end surface facing the detection surface 3, and the flow guide groove 41 has a spacing with the detection surface 3; the lower part of the shell 1 is provided with a transversely penetrating interface 12 on the side away from the mounting surface 9, and the interface 12 is provided with a long strip-shaped flow guide opening 122 at the bottom. When the baffle 4 is positioned and installed on the mounting surface 9, the flow guide opening 122 at the interface 12 and the flow guide groove 41 at the baffle form a flow guide channel.

[0049] In this way, the baffle 4 provided on the mounting surface 9 controls the cleaning direction to be obliquely upward along the detection surface 3, and the flow guide groove 41 parallel to the detection surface 3 is provided with a spacing. The flow guide channel formed by the flow guide opening 122 at the interface 12 and the flow guide groove 41 at the baffle allows the cleaning medium to pass through the channel to clean the detection surface 3 of the sensor, so that the cleaning medium sprayed by the flow guide groove 41 can clean the detection surface 3 exactly, thereby removing the particulate matter adhering to the detection surface 3 and reducing the accumulation of impurities, thereby reducing the influence of the adhesion of suspended impurities in the water to be measured on the detection surface 3 of the sensor on the detection result.

[0050] In specific embodiments, the mounting surface 9 is provided with a threaded hole, the baffle 4 is provided with a through hole at the position corresponding to the threaded hole, and the baffle 4 is positioned and installed on the mounting surface 9 by corresponding the through hole to the threaded hole on the mounting surface 9 and using a screw 10.

[0051] In this way, the baffle 4 is convenient to install or dismount and replace.

[0052] In a specific embodiment, the cleaning device 11 is further included, the installation position section of the cleaning device 11 is provided with external threads, the cleaning device 11 is installed with the interface 12 through a connecting component, the connecting component is fixedly installed at the interface 12, and the connecting component is threadedly matched with the external threads on the cleaning device 11 to provide locking force; and the cleaning device 11 is electrically connected with the detection control integrated circuit 6.

[0053] In this way, the installation of the cleaning device 11 and the interface 12 is realized through the detachable connecting component, wear of the interface 12 and the cleaning device 11 during repeated installation and dismounting is reduced, and the durability of the turbidity sensor is increased.

[0054] When the turbidity sensor is cleaned, the detection of the integrated circuit controls the start of the cleaning device 11, the cleaning medium sprayed by the cleaning device 11 can move obliquely upward through the flow guide channel to clean the detection surface 3 and remove the pollutants attached to the detection surface 3. Compared with the cleaning brush used in the prior art to clean the detection surface 3, the connection between the cleaning brush and the shell 1 can easily cause the sealing performance of the sensor to be reduced, the internal circuit of the sensor to be short-circuited, and the performance of the sensor to be affected. In the present scheme, the cleaning device 11 is arranged at the lower part of the shell, is fixedly installed with the interface 12 through the connecting component, is threadedly matched with the connecting component through the external threads of the cleaning device 11 to be installed with the interface 12, and the cleaning medium sprayed by the cleaning device 11 passes through the flow guide channel to clean the detection surface 3. Such a design ensures the sealing performance of the turbidity sensor, improves the detection accuracy of the turbidity sensor, and can be used for high-pressure or deep-water measurement. Meanwhile, the detachable cleaning device 11 can adapt to turbidity detection in different environments, and the applicability of the turbidity sensor is improved.

[0055] In addition, in the specific embodiment, the cleaning medium can be air or clean water, so as to adapt to various application scenarios; and the joint can adopt a bent air blowing or a straight air blowing.

[0056] In a specific embodiment, the central axis of the light-sensing through hole and the central axis of the light beam emitted by the light source 2 are less than 90° intersected.

[0057] In this way, the turbidity sensor in the prior art measures the scattered light at 90°. However, in actual use, the light beams of the turbidity detection light source 2 of the turbidity sensor diverge at a certain angle outward. Therefore, part of the light source 2 cannot be well reflected back to the light-sensing element 5. Through the optimization of the light path in the present embodiment, the utilization rate of the light beam can be improved, and the accuracy of the turbidity sensor is improved.

[0058] In specific embodiments, the light guide column 7 is arranged at the front end of the light transmission hole 21 and the light guide column 7 is an inclined polished surface close to the detection surface 3.

[0059] In this way, when the light source 2 scattered in the water to be measured is compactly reflected to the photosensitive element 5, the reflected light source 2 will be offset at a certain angle, which cannot be received by the photosensitive element 5, thereby reducing the detection accuracy of the turbidity sensor. In the embodiment, the light guide column 7 at the front end of the light transmission hole 21 is designed to effectively guide the light beam emitted by the light source 2, so that it is more concentrated and directional to the suspended particles in the water to be measured. At the same time, the light guide column 7 at the front end of the light transmission hole 21 helps to focus the scattered light onto the photosensitive element 5, thereby improving the accuracy and reliability of the turbidity sensor.

[0060] In specific embodiments, the light transmission lens 8 is made of quartz glass.

[0061] In this way, the quartz glass can well transmit light, so that the photosensitive element 5 can better sense the light scattered by impurities in the water to be measured, which is beneficial to improve the detection effect of the turbidity sensor, thereby improving the use effect of the turbidity sensor.

[0062] In specific embodiments, the signal output end of the detection control integrated circuit 6 is electrically connected with a signal output line for connecting with an external device, and the upper part of the shell 1 is provided with a wire outlet hole, and the signal output line is led out from the upper part of the shell 1 through the wire outlet hole.

[0063] In this way, the signal output line is led out through the wire outlet hole in the upper part of the shell 1, thereby helping to protect the cable and improving the sealing and waterproof performance of the turbidity sensor.

[0064] In the embodiment, the detection control integrated circuit 6 can adopt a microprocessor such as a single-chip microcomputer and an embedded chip as a core integrated circuit for controlling the turbidity detection process, collecting data and outputting the turbidity detection result, which includes starting and stopping control of the light source 2, data collection of the photosensitive element 5, conversion and processing of the collected data, and output processing of the turbidity detection result. Therefore, the microprocessor as the core should select a processing chip with functions of AD conversion, logic operation processing, UART serial communication interface 12 output, etc. In the embodiment, an STM32 single-chip microcomputer is selected. The light source 2 selects a laser diode with concentrated light beam and high light intensity, so that the scattered light is easier to sense, and the service life of the diode light source 2 is relatively long. The photosensitive element 5 is a photovoltaic cell maturely used in the prior art. The light transmission lens 8 is preferably made of quartz glass because of its good light transmission, chemical stability, and excellent electrical insulation performance.

[0065] The above-mentioned is only the embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail, the ordinary skilled person in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, the ordinary skilled person in the art can improve and implement the present scheme under the inspiration given in the present application, and some typical known structures or known methods should not become an obstacle for the ordinary skilled person in the art to implement the present application. It should be pointed out that for the skilled person in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A turbidity sensor comprising a housing, a detection control integrated circuit, a light receiving element, and a light source, characterized by: The lower end surface of the lower part of the shell has an oblique detection surface on one side, so that the lower end surface of the shell and one side of the shell form an oblique chamfer surface; The detection surface has a light transmission hole corresponding to the light source and a light beam entering the photosensitive element, and the detection surface has a light transmission lens corresponding to the light transmission hole and the photosensitive hole; the photosensitive element and the light source are respectively connected with the detection control integrated circuit arranged above the photosensitive element.

2. The turbidity sensor of claim 1, wherein The detection surface has an embedded step recessed towards the inside of the detection surface corresponding to the position of the photosensitive hole and the light transmission hole, the shape of the embedded step area matches the shape of the light transmission lens, and the light transmission lens is sealed and installed at the embedded step, and the outer surface of the light transmission lens can be flush with the surface of the detection surface when installed at the embedded step.

3. The turbidity sensor of claim 1, wherein, The light source has a mounting surface on one side of the central axis of the light beam emitted through the light transmission hole, and the mounting surface has a baffle fixedly installed thereon, and the baffle has a flow guide groove parallel to the end surface of the detection surface, and the flow guide groove has a spacing with the detection surface; the lower part of the shell has a transversely extending interface on the side away from the mounting surface, and the interface has a long strip-shaped flow guide opening at the bottom; when the baffle is positioned and installed on the mounting surface, the flow guide opening at the interface and the flow guide groove at the baffle are connected to form a flow guide channel.

4. The turbidity sensor of claim 3, wherein, The mounting surface has a threaded hole, and the baffle has a through hole corresponding to the threaded hole, and the baffle is positioned and installed on the mounting surface by corresponding the through hole with the threaded hole and using a screw.

5. The turbidity sensor of claim 4, wherein, The cleaning device is installed on the position segment and has an external thread, and the cleaning device is installed on the interface through a connecting part, and the connecting part is fixedly installed on the interface and threadedly matched with the external thread of the cleaning device to provide locking force; the cleaning device is electrically connected with the detection control integrated circuit.

6. The turbidity sensor of claim 1, wherein, The central axis of the photosensitive hole and the central axis of the light beam emitted by the light source intersect at an angle less than 90°.

7. The turbidity sensor of claim 1, wherein, The front ends of the photosensitive hole and the light transmission hole are provided with light guide columns, one end of the light guide column close to the detection surface is an inclined polished surface, and the inclined polished surface and the detection surface are a plane.

8. The turbidity sensor of claim 1, wherein, The light transmission lens is made of quartz glass.

9. The turbidity sensor of claim 1, wherein, The signal output end of the detection control integrated circuit is electrically connected with a signal output line for connecting with an external identification device, the upper part of the shell has a wire outlet hole, and the signal output line passes out from the upper part of the shell through the wire outlet hole.

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