Turbidity sensor

Abstract

The turbidity sensor comprises a shell, a laser transmitter, a light source receiver and an integrated circuit board, a light guide column is embedded in the middle of the shell, one end of the light guide column is located on the outer surface of the shell, and the other end of the light guide column extends into the shell; in the shell, the light guide column is connected with a heating device for heating the light guide column; the laser transmitter is mounted on the heating device, and the laser transmitting end of the laser transmitter is correspondingly conducted with the light guide column; and at least one drying agent bag for keeping the internal space of the shell dry is also placed in the shell. According to the turbidity sensor, the light guide column is used for replacing an existing light transmitting mirror, the heating device is arranged in the shell and below the light guide column to heat the light guide column, the light guide column is large in thickness, low-temperature water vapor on the outer side of the light guide column can be prevented from being transmitted into the shell, heating of the heating device and adsorption of water molecules in air by the drying agent bag can be avoided, and the turbidity can be effectively detected. Water mist on the inner side of the light guide column can be effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing equipment, specifically to a turbidity sensor. Background Technology

[0002] A turbidity sensor is a device used to measure the concentration of suspended particulate matter in water. It assesses the turbidity of water by detecting the scattering and absorption of light as it passes through a water sample. Currently, turbidity sensors typically use the scattering method to detect the turbidity of water samples. The principle of the scattering method is that a beam of incident light of a fixed wavelength is shone into the water sample. When the incident light hits suspended particles in the water, it is scattered. The more turbid the water, the more obvious the light scattering. Photoelectric conversion devices such as silicon photocells, photodetectors, and photomultiplier tubes are used to detect the intensity of the scattered light from a direction at 90° to the incident light. The turbidity of the water can then be detected based on the conversion relationship between the intensity of the scattered light and the turbidity of the water.

[0003] In the process of using a turbidity sensor for detection, a humid environment can easily cause water vapor to form on the light-transmitting lens, resulting in scattering of the light source and affecting the accuracy of turbidity detection. To solve the above problem, Chinese Patent Application No. 2012206351101 discloses a turbidity sensor, including a housing, a detection and control integrated circuit, a light source, and a photoelectric conversion device; the housing is composed of an upper housing, a housing connecting part, and a lower housing connected from top to bottom; a light-transmitting hole is provided on the lower end surface of the upper housing corresponding to the position of the recessed cavity for the light source to emit a beam of light downwards, and a light-transmitting lens is installed between the light source and the light-transmitting hole to seal and isolate the light source from the light-transmitting hole; an electric heating element for heating the light-transmitting lens and a temperature sensor for detecting the temperature of the light-transmitting lens are also installed inside the upper housing; the light source, the electric heating element, and the temperature sensor are electrically connected to the detection and control integrated circuit. The above solution prevents water vapor from condensing on the light-transmitting lens by installing an electric heating element for heating the light-transmitting lens and a temperature sensor for detecting the temperature of the light-transmitting lens, thus eliminating the impact of fogging on the detection. At the same time, the temperature sensor can be used for temperature monitoring to prevent overheating from affecting the lifespan of the device.

[0004] In the aforementioned turbidity sensor, the transparent lens is positioned above the surface of the liquid being tested, and the lens does not directly contact the water during detection. However, in an existing turbidity sensor connected to a flow cell, the photodetector is located inside the flow cell, and the transparent lens is in direct contact with the liquid being tested. If the aforementioned anti-fogging structure of the lens is applied to this type of turbidity sensor, the water flow in the flow cell will carry away some heat, resulting in poor anti-fogging performance of the transparent lens. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a turbidity sensor that solves the problem that when existing turbidity sensors are used for detection, the light-transmitting lens is placed in the liquid to be measured, and there is a temperature difference between the inside and outside of the housing, which easily causes water mist to form on the inner side of the light-transmitting lens, affecting the accuracy of turbidity detection.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A turbidity sensor includes a housing, a laser emitter, a light source receiver, and an integrated circuit board. A light guide column is embedded in the middle of the housing, with one end of the light guide column on the outer surface of the housing and the other end extending into the housing. A heating device for heating the light guide column is connected inside the housing and to the light guide column. The laser emitter is mounted on the heating device, and the laser emitting end of the laser emitter is conductively connected to the light guide column. Thus, during detection, the outside of the light guide column is always in a stable water flow. By replacing a transparent lens with a light guide column, and connecting the heating device to the end of the light guide column extending into the housing, the light guide column, being columnar and much thicker than a transparent lens, allows heat to be continuously transferred to the light guide column after heating. Under the same water flow conditions, the heat loss from the light guide column is slower, effectively ensuring that the light guide column at one end of the housing remains within a certain temperature range, preventing water vapor formation inside the light guide column due to heat loss caused by the water flow. Like the light guide, the light guide column is transparent, ensuring that heat is not easily lost from the inside and that the laser beam can be detected after it is emitted. The laser emitter is placed on the heating device and is connected to the light guide column, ensuring that the laser beam can pass through the light guide column and be emitted.

[0008] Furthermore, at least one desiccant packet is placed inside the housing to keep the interior space dry. Thus, after placing the desiccant packet inside the housing, the desiccant within can absorb moisture from the surrounding humid air, and when combined with the heating device, the anti-fogging effect is even better.

[0009] Furthermore, a desiccant pack placement space is provided inside the housing and on both sides of the light guide column, communicating with the space where the light guide column is located. At least one desiccant pack is placed in each desiccant pack placement space. In this way, the desiccant pack placement space is connected to the space where the light guide column is located, thereby also drying the air around the light guide column. The desiccant packs placed around the light guide column can dry the surrounding air, and the even placement of the desiccant packs also improves the anti-fogging effect.

[0010] Furthermore, the light guide column is vertically arranged, and the heating device includes a heat-conducting cylinder sleeved on the light guide column, with a heating element mounted on the heat-conducting cylinder. The heating element is electrically connected to the integrated circuit board. In this way, the heating device and the light guide column are connected by a sleeve, and the heat-conducting cylinder of the heating device can conduct heat. After the heating element is heated, the heat can be transferred to the light guide column through the heat-conducting cylinder, resulting in a uniform heat transfer effect.

[0011] Furthermore, a mounting base integrally formed with the heat-conducting cylinder is provided at its lower end, and a mounting hole corresponding to and communicating with the hollow part of the heat-conducting cylinder is provided in the middle of the mounting base, and the laser emitter is fixedly installed in the mounting hole. In this way, the mounting base under the heat-conducting cylinder can facilitate the installation of the heating device on other components inside the housing, and at the same time, the mounting hole provided in the middle of the mounting base can facilitate the installation of the laser emitter.

[0012] Furthermore, an assembly plate is provided in the middle of the heat-conducting cylinder, and an assembly tube is provided in the middle of the shell. The heat-conducting cylinder of the heating device is placed inside the assembly tube and tightly fitted with the assembly tube through the assembly plate. The mounting seat of the heating device is in close contact with the lower end face of the assembly tube. In this way, with the assembly plate in the middle of the heat-conducting cylinder, the heating device is more stable after installation. The close contact between the mounting seat and the lower end of the assembly tube can prevent heat from flowing downwards into the shell.

[0013] Furthermore, the assembly plate has an annular groove in the center, and a sealing ring is embedded in the annular groove. The heating element is placed under the assembly plate and on the mounting base. In this way, the sealing ring effectively ensures that the heating space in which the heating element is located is relatively sealed, and heat is not easily lost. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the turbidity sensor in the embodiment;

[0015] Figure 2 This is a side view of the turbidity sensor in the embodiment;

[0016] Figure 3 for Figure 2 Sectional view of AA. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0018] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] like Figures 1-3As shown, this embodiment provides a turbidity sensor, including a housing 1, a laser emitter 2, a light source receiver 4, and an integrated circuit board. The housing 1 consists of a main housing 11 and a detachable sealing cover 12 installed at the lower end of the main housing 11 (the housing 1 is black). The main housing 11 has threads for connecting to a flow cell. A light guide post 3 is embedded in the middle of the main housing 11, with one end of the light guide post 3 on the outer surface of the housing 1 and the other end extending into the housing 1. A heating device 5 for heating the light guide post 3 is connected inside the housing 1 and to the light guide post 3. The laser emitter 2 is installed on the heating device 5, and the laser emitting end of the laser emitter 2 is correspondingly connected to the light guide post 3. During installation, after removing the sealing cover 12, the light guide post 3 and the heating device 5 can be installed step by step. After installation, the sealing cover 12 is then installed to seal the lower end of the housing 1. During detection, the upper end of the turbidity sensor is sealed and installed in the flow cell, the light source receiver 4 is placed in the flow cell, and the outer side of the light guide post 3 is placed in the steady flow channel of the flow cell. A heating device 5 is connected to the end of the light guide column 3 that extends into the housing 1. Since the light guide column 3 is columnar and much thicker than the light-transmitting mirror, heat is continuously transferred to the light guide column 3 after heating by the heating device 5. Under the same water flow conditions, the heat loss from the light guide column 3 is slower, effectively ensuring that the light guide column 3 remains at a certain temperature at one end of the housing 1, preventing water vapor from forming inside the light guide column 3 after the water flow carries away the heat. Like the light-transmitting mirror, the light guide column 3 is transparent, ensuring that heat is not easily lost from the inside and that the laser beam can be used for detection after emission. The laser emitter 2 is placed on the heating device 5 and is connected to the light guide column 3, ensuring that the laser beam can pass through the light guide column 3 and be emitted.

[0020] To further enhance the anti-fogging effect on the light guide column 3 within the housing 1, at least one desiccant pack 6 is placed inside the housing 1 to maintain the dryness of the internal space. A desiccant pack placement space 112, connected to the space where the light guide column 3 is located, is provided on both sides of the housing 1. At least one desiccant pack 6 is placed in each desiccant pack placement space 112. Thus, after placing the desiccant pack 6 inside the housing 1, the desiccant in the desiccant pack 6 can absorb moisture from the surrounding humid air. Combined with the heating device 5, the anti-fogging effect is further improved. The desiccant pack placement space is connected to the space where the light guide column 3 is located, thus also drying the air around the light guide column 3. The even placement of the desiccant pack 6 around the light guide column 3 further dries the surrounding air, and the even distribution of the desiccant pack 6 also contributes to a better anti-fogging effect.

[0021] The light guide post 3 is cylindrical, with a protrusion at its upper end. A through hole for engaging with the light guide post 3 is located in the middle of the main housing 11. The top of the through hole is conical, wider at the top and narrower at the bottom, to facilitate the installation of the light guide post 3.

[0022] like Figure 3As shown, the light guide column 3 is vertically arranged. The heating device 5 includes a heat-conducting cylinder 51 sleeved on the light guide column 3, and a heating element 53 is provided on the heat-conducting cylinder 51. The heating element 53 is electrically connected to the integrated circuit board. A mounting base 52 integrally formed with the heat-conducting cylinder 51 is provided at its lower end. A mounting hole corresponding to and communicating with the hollow part of the heat-conducting cylinder 51 is provided in the middle of the mounting base 52. The laser emitter 2 is fixedly installed in the mounting hole. The heating element 53 is a heating wire or lamp bead, or other heating component, and the heating wire is wound around the heat-conducting cylinder 51. For ease of assembly, the inner hole at the top of the heat-conducting cylinder 51 is conical, with a larger diameter at the upper end and a smaller diameter at the lower end. The heat-conducting cylinder 51 is made of aluminum or other thermally conductive materials. Both the outer surfaces of the heat-conducting cylinder 51 and the mounting base 52 are coated with a black light-shielding coating to prevent reflection and affect the detection results. The heating device 5 and the light guide column 3 are connected by a sleeve. The heat-conducting cylinder 51 of the heating device 5 is capable of conducting heat. After the heating element 53 is heated, the heat can be transferred to the light guide column 3 through the heat-conducting cylinder 51, resulting in a uniform heat transfer effect. The mounting base 52 under the heat-conducting cylinder 51 facilitates the installation of the heating device 5 on other components inside the housing 1. At the same time, the mounting hole in the middle of the mounting base 52 facilitates the installation of the laser emitter 2.

[0023] Furthermore, an assembly plate is provided in the middle of the heat-conducting cylinder 51, and an assembly cylinder 111 integrally formed therewith is provided in the middle of the housing 1 (the two sides of the assembly cylinder are the drying package placement spaces 112, and the drying package placement spaces 112 and the assembly cylinder are connected by a transverse channel). The heat-conducting cylinder 51 of the heating device 5 is placed inside the assembly cylinder 111 and is tightly fitted with the assembly cylinder 111 by the assembly plate. The mounting base 52 of the heating device 5 is in close contact with the lower end face of the assembly cylinder 111. In this way, after the assembly plate is provided in the middle of the heat-conducting cylinder 51, the heating device 5 is more stable after installation. The mounting base 52 is in close contact with the lower end of the assembly cylinder 111, which can prevent heat from flowing downwards from the housing 1.

[0024] Furthermore, an annular groove is provided in the center of the assembly plate, and a sealing ring is embedded in the annular groove. The heating element 53 is placed under the assembly plate and on the mounting base 52. In this way, the sealing ring effectively ensures that the heating space in which the heating element 53 is located is relatively sealed, and heat is not easily lost.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A turbidity sensor, comprising a housing, a laser emitter, a light source receiver, and an integrated circuit board, characterized in that, A light guide post is embedded in the middle of the housing, with one end of the light guide post on the outer surface of the housing and the other end extending into the housing; a heating device for heating the light guide post is connected inside the housing and on the light guide post; the laser emitter is mounted on the heating device, and the laser emitting end of the laser emitter is connected to the light guide post.

2. The turbidity sensor according to claim 1, characterized in that, At least one desiccant packet is also placed inside the housing to keep the interior space of the housing dry.

3. The turbidity sensor according to claim 2, characterized in that, Inside the housing, on both sides of the light guide post, there is a desiccant pack placement space that is connected to the space where the light guide post is located. At least one desiccant pack is placed in each desiccant pack placement space.

4. The turbidity sensor according to claim 1, 2, or 3, characterized in that, The light guide column is arranged vertically, and the heating device includes a heat-conducting cylinder sleeved on the light guide column. A heating element is provided on the heat-conducting cylinder, and the heating element is electrically connected to the integrated circuit board.

5. The turbidity sensor according to claim 4, characterized in that, A mounting base integrally formed with the heat-conducting cylinder is provided at the lower end of the heat-conducting cylinder, and a mounting hole corresponding to and communicating with the hollow part of the heat-conducting cylinder is provided in the middle of the mounting base, and the laser emitter is fixedly installed in the mounting hole.

6. The turbidity sensor according to claim 5, characterized in that, An assembly plate is provided in the middle of the heat-conducting cylinder, and an assembly cylinder is provided in the middle of the shell. The heat-conducting cylinder of the heating device is placed inside the assembly cylinder and is tightly fitted with the assembly cylinder through the assembly plate. The mounting base of the heating device is in close contact with the lower end face of the assembly cylinder.

7. The turbidity sensor according to claim 6, characterized in that, The assembly plate has an annular groove in the middle, and a sealing ring is embedded in the annular groove. The heating element is placed under the assembly plate and on the mounting base.

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