Liquid concentration photoelectric online detection sensor

Abstract

The utility model belongs to the field of photoelectric detection, and provides a liquid concentration photoelectric online detection sensor which comprises a detection shell I and a detection shell II, communicated mounting cavities are arranged in the detection shell I and the detection shell II, a liquid inlet is arranged on a top plate of the detection shell I, a liquid stagnation pipe is arranged in the liquid inlet, and a liquid outlet is arranged in the liquid stagnation pipe. The liquid stagnation pipe is a hollow pipe body; the detection prism is located in the mounting cavity, the top of the detection prism is attached to the bottom of the liquid stagnation pipe, a measuring light source externally connected with a power source is arranged in the mounting cavity, a light source opening of the measuring light source faces the liquid stagnation pipe, a photoelectric receiver is arranged right opposite to the measuring light source, and the bottom of the detection prism is fixed through a supporting assembly; according to the utility model, the detection prism is additionally arranged in the sensor, so that the accuracy of a concentration detection result of colored and turbid liquid is improved.

Description

Technical Field

[0001] This utility model belongs to the field of photoelectric detection, specifically a liquid concentration photoelectric online detection sensor. Background Technology

[0002] Real-time online detection of liquid concentration has significant application value in industries such as chemical engineering, pharmaceuticals, food and beverage, and environmental protection. Traditional detection methods mainly rely on offline laboratory analysis, such as refractometers, densitometers, and chemical titration. These methods require manual sampling and interruption of the production process, resulting in drawbacks such as response lag, cumbersome operation, and inability to achieve closed-loop control. Taking the sugar industry as an example, offline detection of sugar solution concentration typically requires sampling every hour, leading to delays in process parameter adjustments and potentially causing energy waste or product quality fluctuations. Furthermore, laboratory instruments have high maintenance costs and rely on professional operators, making them difficult to adapt to the continuous and intelligent demands of modern industry.

[0003] To meet the needs of online detection, existing technologies include optical transmission methods that calculate concentration by measuring liquid absorbance. Although such sensors have a simple structure, they are severely affected by liquid color, turbidity, and light source stability. For example, when detecting colored liquids (such as wine), the absorbance signal is easily interfered with by background absorption, requiring complex spectral analysis algorithms, which are costly. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides an online photoelectric sensor for liquid concentration detection, which solves the problem of inaccurate detection when the sensor detects the concentration of some colored or turbid liquids in the prior art.

[0005] A liquid concentration photoelectric online detection sensor includes a detection housing one and a detection housing two. The detection housing one and the detection housing two are provided with interconnected installation chambers. The top plate of the detection housing one is provided with a liquid inlet, and a liquid stagnation tube is provided inside the liquid inlet. The liquid stagnation tube is a hollow tube.

[0006] It also includes a detection prism, which is located in the mounting chamber and its top is attached to the bottom of the liquid stagnation tube. An external power supply measuring light source is provided in the mounting chamber, with the light source opening of the measuring light source facing the liquid stagnation tube. A photoelectric receiver is provided directly opposite the measuring light source, and the bottom of the detection prism is fixed by a support assembly.

[0007] Preferably, the liquid stagnation tube is made of a transparent material, the liquid stagnation tube is fixed inside the liquid inlet, and the height of the liquid stagnation tube is greater than the height of the liquid inlet.

[0008] Preferably, the bottom of the liquid stagnation tube is provided with an annular sealing ring, and the top of the detection prism is provided with a limiting ring. After the detection prism is attached to the liquid stagnation tube, the inner wall of the limiting ring is attached to the outer wall of the liquid stagnation tube.

[0009] Preferably, the inner wall of the detection housing is provided with a fixedly connected mounting ring, and the measuring light source and the photoelectric receiver are mounted on the top of the mounting ring.

[0010] Preferably, a connector is provided on the side wall of the second detection housing. The connector is connected to the photoelectric receiver via a wire, and the other end of the connector is connected to an external detection device.

[0011] Preferably, the support assembly includes a threaded annular portion, a displacement plate, and a support rod. The threaded annular portion is disposed on the top of the second detection housing. The external thread on the outer wall of the threaded annular portion engages with the internal thread inside the first detection housing. The displacement plate is fixedly connected to one end of the threaded annular portion away from the second detection housing. The support rod is vertically mounted on the displacement plate, and the other end of the support rod is fixedly connected to the detection prism.

[0012] Preferably, the two side walls of the displacement plate are arc-shaped surfaces, and the two arc-shaped surfaces of the displacement plate are in active contact with the interior of the detection housing.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model uses two detection housings, a first detection housing and a second detection housing, with an installation chamber inside each housing. A liquid stagnation tube is installed inside the liquid inlet, and a detection prism made of optical sapphire is installed at the bottom of the liquid stagnation tube. When liquid enters the liquid stagnation tube, it remains inside. A measuring light source emits light that enters the detection prism, passes through the prism, and enters the liquid stagnation tube. After refraction within the liquid stagnation tube, the light source passes through the detection prism again and is captured by a receiver, converting the light signal into an electrical signal. This signal is then connected to an external device via a connector, thereby enabling liquid concentration detection. Compared to traditional optical transmission detection methods, this method reduces the influence of liquid color, turbidity, and light source stability, improving the detection results for liquid concentration. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the internal components of the first and second detection housings of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall detection sensor component structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of a component of the detection housing of this utility model;

[0018] Figure 4 This is a schematic diagram of the two-component structure of the detection housing of this utility model;

[0019] Figure 5 This is a schematic diagram of the displacement plate and detection prism components of this utility model;

[0020] Figure 6 This is a schematic diagram of the sensor structure with a display screen.

[0021] In the picture:

[0022] 1. Detection housing one; 2. Detection housing two; 3. Mounting chamber; 4. Liquid inlet; 5. Liquid stagnation tube; 6. Detection prism; 7. Measuring light source; 8. Photoelectric receiver; 9. Sealing ring; 10. Limiting ring; 11. Mounting ring; 12. Connecting plug; 13. Threaded annular part; 14. Displacement plate; 15. Support rod. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0024] As attached Figure 1 To be continued Figure 5 As shown:

[0025] Example 1: This utility model provides a liquid concentration photoelectric online detection sensor, including a detection housing 1 and a detection housing 2. The detection housing 1 and the detection housing 2 are provided with an interconnected installation chamber 3. The top plate of the detection housing 1 is provided with a liquid inlet 4, and a liquid stagnation tube 5 is provided inside the liquid inlet 4. The liquid stagnation tube 5 is a hollow tube.

[0026] It also includes a detection prism 6, which is located in the mounting chamber 3 and its top is attached to the bottom of the liquid stagnation tube 5. An external power supply measuring light source 7 is installed in the mounting chamber 3. The light source port of the measuring light source 7 faces the liquid stagnation tube 5. A photoelectric receiver 8 is installed directly opposite the measuring light source 7. A support assembly is installed at the bottom of the detection prism 6.

[0027] It should be noted that, through the configured detection housing 1 and detection housing 2, an installation chamber 3 is set inside the detection housing 1 and detection housing 2, and a liquid stagnation tube 5 is set inside the liquid inlet 4. A detection prism 6 is set at the bottom of the liquid stagnation tube 5 and is attached to it. The detection prism 6 is made of optical sapphire. When liquid enters the liquid stagnation tube 5, it will remain inside the liquid stagnation tube 5. The light emitted by the measuring light source 7 enters the detection prism 6, passes through the detection prism 6 and enters the liquid stagnation tube 5. After the light source is refracted inside the liquid stagnation tube 5, it passes through the detection prism 6 again and is captured by the receiver, which converts the light signal into an electrical signal. Then, it is connected to an external device through the connector 12, thereby realizing the detection of liquid concentration. Compared with the traditional method, the detection result of liquid concentration is improved.

[0028] In this embodiment, the liquid stagnation tube 5 is made of transparent material, and the liquid stagnation tube 5 is fixed inside the liquid inlet 4, and the height of the liquid stagnation tube 5 is greater than the height of the liquid inlet 4.

[0029] It should be noted that by designing the liquid stagnation tube 5 as a transparent material, the light source can enter the liquid stagnation tube 5 without affecting its entry. The height of the liquid stagnation tube 5 is designed to be greater than the height of the liquid inlet 4, so that after the liquid is placed into the liquid inlet 4, more liquid can enter the liquid stagnation tube 5, allowing the detection prism 6 to enter the liquid stagnation tube 5 more effectively.

[0030] In this embodiment, the bottom of the liquid stagnation tube 5 is provided with an annular sealing ring 9, and the top of the detection prism 6 is provided with a limiting ring 10. After the detection prism 6 is attached to the liquid stagnation tube 5, the inner wall of the limiting ring 10 is attached to the outer wall of the liquid stagnation tube 5.

[0031] It should be noted that by setting a sealing ring 9 at the bottom of the liquid stagnation tube 5, after the detection prism 6 and the liquid stagnation tube 5 are installed, the sealing performance of the two after the connection can be improved, and the liquid can be prevented from flowing out from the gap between the two. The limiting ring 10 can be set to allow the detection prism 6 and the liquid stagnation tube 5 to be connected together.

[0032] In this embodiment, the inner wall of the detection housing 1 is provided with a fixedly connected mounting ring 11, and the measuring light source 7 and the photoelectric receiver 8 are mounted on the top of the mounting ring 11.

[0033] In this embodiment, a connector 12 is provided on the side wall of the second detection housing 2. The connector 12 is connected to the photoelectric receiver 8 via a wire, and the other end of the connector 12 is connected to an external detection device.

[0034] It should be noted that the photoelectric receiver 8 is connected to the connector 12 via a wire, and the connector 12 is connected to an external device. When the photoelectric receiver 8 receives the refracted light source, it converts it into an electrical signal and transmits it to the external device via the wire, thereby realizing the detection of liquid concentration.

[0035] In this embodiment, the support assembly includes a threaded annular portion 13, a displacement plate 14, and a support rod 15. The threaded annular portion 13 is disposed on the top of the detection housing 2. The external thread on the outer wall of the threaded annular portion 13 engages with the internal thread inside the detection housing 1. The displacement plate 14 is fixedly connected to the end of the threaded annular portion 13 away from the detection housing 2. The support rod 15 is vertically mounted on the displacement plate 14, and the other end of the support rod 15 is fixedly connected to the detection prism 6.

[0036] It should be noted that, through the set support components, the threaded annular part 13 is fixedly connected to the detection housing 2. The detection housing 1 and the detection housing 2 are connected and disassembled by threads. When the internal components of the sensor are damaged, the two can be separated to replace the internal components, which improves convenience.

[0037] Furthermore, a displacement plate 14 is provided at the top of the threaded annular portion 13, and a support rod 15 is provided between the displacement plate 14 and the detection prism 6. The support rod 15 passes through the mounting ring 11. When the detection housing 2 and the detection housing 1 are rotated and locked, the displacement plate 14 and the support rod 15 can drive the detection prism 6 to move closer to the liquid stagnation tube 5. When the detection prism 6 and the liquid stagnation tube 5 are tightly fitted, the detection housing 1 and the detection housing 2 are connected together, which improves the installation flexibility.

[0038] In this embodiment, the two side walls of the displacement plate 14 are arc-shaped surfaces, and the two side arc-shaped surfaces of the displacement plate 14 are in active contact with the inside of the detection housing 1.

[0039] It should be noted that by setting the two side walls of the displacement plate 14 as arc-shaped surfaces and movably fitting them to the inner wall of the detection housing 1, the side walls of the displacement plate 14 are always in contact with the inside of the detection housing 1 when it moves, ensuring the stability of the moving direction and preventing it from tilting during movement. This ultimately allows the detection prism 6 and the liquid stagnation tube 5 to fit together more tightly.

[0040] As attached Figure 6 As shown:

[0041] Example 2: This utility model provides a liquid concentration photoelectric online detection sensor, including a detection housing 1 and a detection housing 2. The detection housing 1 and the detection housing 2 are provided with interconnected installation chambers. The top plate of the detection housing 1 is provided with a liquid inlet, and a liquid stagnation tube is provided inside the liquid inlet. The liquid stagnation tube is a hollow tube. The detection housing 2 is provided with a display screen on the side away from the detection housing 1. The display screen has control buttons, and the display screen and analog output signal are 4-mA.

[0042] The above measurement principle is as follows: the measuring light source 7 emits monochromatic light with a wavelength of 589nm. The light enters the liquid to be measured in the liquid stagnation tube 5 through the detection prism 6. After refraction at the prism-liquid interface, the reflected light intensity is captured by the photoelectric receiver 8. Its output electrical signal is processed by the AD conversion module and transmitted to the external processor through the connector 12. The liquid concentration is calculated according to the preset refractive index-concentration relationship model.

[0043] The embodiments of this utility model are given for the purpose of illustration and description. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this utility model.

Claims

1. A photoelectric online detection sensor for liquid concentration, characterized in that, include: The detection housing is divided into a first detection housing (1) and a second detection housing (2). The first detection housing (1) and the second detection housing (2) are provided with an interconnected installation chamber (3). The top plate of the first detection housing (1) is provided with a liquid inlet (4). The liquid inlet (4) is provided with a liquid stagnation tube (5). The liquid stagnation tube (5) is a hollow tube. It also includes a detection prism (6), which is located in the mounting chamber (3) and its top is attached to the bottom of the liquid stagnation tube (5). An external power supply measuring light source (7) is provided in the mounting chamber (3), and the light source port of the measuring light source (7) faces the liquid stagnation tube (5). A photoelectric receiver (8) is provided directly opposite the measuring light source (7). The bottom of the detection prism (6) is fixed by a support assembly.

2. The online photoelectric detection sensor for liquid concentration as described in claim 1, characterized in that: The liquid stagnation tube (5) is made of transparent material. The liquid stagnation tube (5) is fixed inside the liquid inlet (4), and the height of the liquid stagnation tube (5) is greater than the height of the liquid inlet (4).

3. The online photoelectric detection sensor for liquid concentration as described in claim 1, characterized in that: The bottom of the liquid stagnation tube (5) is provided with an annular sealing ring (9), and the top of the detection prism (6) is provided with a limiting ring (10). After the detection prism (6) is attached to the liquid stagnation tube (5), the inner wall of the limiting ring (10) is attached to the outer wall of the liquid stagnation tube (5).

4. The online photoelectric detection sensor for liquid concentration as described in claim 1, characterized in that: The inner wall of the detection housing (1) is provided with a fixedly connected mounting ring (11), and the measuring light source (7) and the photoelectric receiver (8) are mounted on the top of the mounting ring (11).

5. The online photoelectric detection sensor for liquid concentration as described in claim 1, characterized in that: The detection housing 2 (2) has a connecting plug (12) on its side wall. The connecting plug (12) is connected to the photoelectric receiver (8) via a wire, and the other end of the connecting plug (12) is connected to an external detection device.

6. The online photoelectric detection sensor for liquid concentration as described in claim 1, characterized in that: The support assembly includes a threaded annular portion (13), a displacement plate (14), and a support rod (15). The threaded annular portion (13) is disposed on the top of the second detection housing (2). The external thread on the outer wall of the threaded annular portion (13) is engaged with the internal thread in the first detection housing (1). The displacement plate (14) is fixedly connected to one end of the threaded annular portion (13) away from the second detection housing (2). The support rod (15) is vertically mounted on the displacement plate (14). The other end of the support rod (15) is fixedly connected to the detection prism (6).

7. The online photoelectric detection sensor for liquid concentration as described in claim 6, characterized in that: The two side walls of the displacement plate (14) are arc-shaped, and the two side arc-shaped surfaces of the displacement plate (14) are in active contact with the inside of the detection housing (1).

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