Water quality detector capable of automatically and quantitatively sampling

Abstract

The invention discloses an automatic quantitative sampling water quality detector which comprises a sample quantitative liquid taking device, a reagent quantitative liquid taking device, a mixed reaction device, a hollow-core optical fiber detection device and a controller, and the mixed reaction device is respectively connected with the sample quantitative liquid taking device, the reagent quantitative liquid taking device and the hollow-core optical fiber detection device; the sample quantitative liquid taking device comprises a sample tube, a hose I, a first peristaltic pump, a hose II, a first three-way joint, a sample quantitative tube, a second three-way joint, a hose III, a hose IV and a second peristaltic pump, the sample tube is connected with the hose I, and the hose I penetrates through the first peristaltic pump and is connected with a lower port of the first three-way joint; the upper port of the first three-way joint is connected with the hose II; and the sample quantifying tube is connected with the right port of the first peristaltic pump and the left port of the second three-way joint. Standardized liquid quantitative sampling is achieved, the quantitative tube can be replaced according to detection requirements, the detection efficiency is high, the precision is high, the structure is simple and safe, repeated use can be achieved, and the cost is low.

Description

Technical Field

[0001] The invention belongs to a water quality detector, in particular to an automatic quantitative sampling water quality detector. Background Art

[0002] At present, in order to meet environmental protection requirements, prevent and control ecological environmental pollution, and improve the quality of the ecological environment, it is necessary to adhere to the implementation of water quality environmental quality monitoring, including monitoring and measuring the types of pollutants in water bodies, the concentrations and changing trends of various pollutants, and evaluating water quality conditions. Among them, various pollutants such as ammonia nitrogen, phosphorus, chromium, mercury, and chemical oxygen demand can be quantitatively detected using ultraviolet-visible spectrophotometry. Most of the existing water quality spectrophotometers require on-site manual sampling to the laboratory, and then manually quantitatively take the samples to be tested. The quantitative operation is complicated, the accuracy is poor, the detection process is cumbersome, the work efficiency is low, and the colorimetric dish has a short optical path, which affects the detection effect and is not convenient for detection. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a water quality detector with automatic quantitative sampling, which has high detection efficiency, is simple and safe, can be reused, and has low cost.

[0004] Technical solution: The water quality detector for automatic quantitative sampling described in the present invention includes a sample quantitative liquid taking device, a reagent quantitative liquid taking device, a mixing reaction device, a hollow-core optical fiber detection device and a controller. The mixing reaction device is respectively connected to the sample quantitative liquid taking device, the reagent quantitative liquid taking device and the hollow-core optical fiber detection device; the sample quantitative liquid taking device includes a sample tube, a hose 1, a first peristaltic pump, a hose 2, a first three-way joint, a sample quantitative tube, a second three-way joint, a hose 3, a hose 4 and a second peristaltic pump. The sample tube is connected to the hose 1, the hose 1 passes through the first peristaltic pump and is connected to the lower port of the first three-way joint, the upper port of the first three-way joint is connected to the hose 2, the sample quantitative tube is respectively connected to the right port of the first peristaltic pump and the left port of the second three-way joint, the lower port of the second three-way joint is connected to the sample tube through the hose 3, the upper port of the second three-way joint is connected to the hose 4, and the hose 4 passes through the second peristaltic pump and is connected to the mixing reaction device.

[0005] Furthermore, a first one-way valve that only allows liquid to pass from top to bottom is provided on hose three, and a second one-way valve that only allows liquid to pass from top to bottom is provided on hose two.

[0006] Further, the reagent quantitative liquid taking device includes a reagent tube, a hose five, a third peristaltic pump, a third three-way joint, a hose six, a reagent quantitative tube, a fourth three-way joint, a hose seven, a hose eight, and a fourth peristaltic pump. The reagent tube is connected to the hose five, the hose five passes through the third peristaltic pump and is connected to the lower port of the third three-way joint, the upper port of the third three-way joint is connected to the hose six, the reagent quantitative tube is respectively connected to the left port of the third three-way joint and the right port of the fourth three-way joint, the lower port of the fourth three-way joint is connected to the reagent tube through the hose seven, the upper port of the fourth three-way joint is connected to the hose eight, the hose eight passes through the fourth peristaltic pump and is connected to the mixing reaction device. The hose six is ​​provided with a third one-way valve that only allows liquid to pass from top to bottom, and the hose seven is provided with a fourth one-way valve that only allows liquid to pass from top to bottom.

[0007] Furthermore, the mixing reaction device includes a mixing tube, a hose 9, and a fifth peristaltic pump, the mixing tube is connected to the hose 9, the hose 9 passes through the fifth peristaltic pump and is connected to the hollow-core optical fiber detection device. A first liquid flow meter is arranged on the hose 9.

[0008] Further, the hollow-core optical fiber detection device includes a fifth three-way joint, a capillary, a sixth three-way joint, a hollow-core optical fiber, a collimator 1, a switching device, a light source, a collimator 2, an optical power detection device, and a hose 10. The capillary is respectively connected to the left port of the fifth three-way joint and the right port of the sixth three-way joint. The left port of the sixth three-way joint is connected to the hollow-core optical fiber, and the upper port is connected to the hose 9 of the mixed reaction device; the hollow-core optical fiber is connected to the light source through the collimator 1 and the switching device; the right port of the fifth three-way joint is connected to the optical power detection device through the collimator 2, and the upper port is connected to the waste liquid pipe through the hose 10. The outer surface of the capillary is plated with a metal coating and coated with polyimide; the interception length of the capillary is about 4cm. A second liquid flowmeter is arranged on the hose 10. The light source is an LED parallel light source with a maximum power of 5W and a light-emitting aperture of 5 to 6mm. It has multiple visible light band light sources and white light sources that can be replaced.

[0009] Furthermore, the sample and reagent are both in solution state and can flow in the device through the action of a peristaltic pump. The sample quantitative tube and the reagent quantitative tube are flexible tubes, and the length and diameter can be changed according to the specific needs of the quantitative volume.

[0010] Furthermore, the optical fiber is a plastic optical fiber with a core diameter of 0.5 mm and an outer diameter of 2.2 mm. The opening and closing of the five peristaltic pumps and the four one-way valves can be controlled by a circuit board or an STM32 single-chip microcomputer.

[0011] Instructions for use: First turn on the power switch to control the peristaltic pump to turn on. The sample passes through the first peristaltic pump from the sample tube, where the one-way valve only allows liquid to pass from top to bottom. The sample then enters the sample quantitative tube until the sample quantitative tube is completely filled with the sample. The excess liquid can be discharged into the sample tube through the first one-way valve; then turn off the first peristaltic pump, turn on the second peristaltic pump, output the sample in the sample quantitative tube to the mixing tube, and complete the quantitative sampling of the sample.

[0012] The third peristaltic pump is controlled to open, and the detection reagent passes through the third peristaltic pump from the reagent tube. The one-way valve only allows liquid to pass from top to bottom, so it then enters the reagent quantitative tube until the reagent quantitative tube is completely filled with reagent, and the excess liquid can be discharged into the reagent tube through the fourth one-way valve; then the third peristaltic pump is closed, and the third one-way valve and the fourth peristaltic pump are opened to output the reagent in the reagent quantitative tube to the mixing tube to complete the quantitative sampling of the reagent.

[0013] Then turn on the light source and the optical power detection device, use the light source switching device to adjust the corresponding wavelength, confirm that the input light is coaxial light after passing through collimator 1 and enters the hollow-core optical fiber. Turn on the fifth peristaltic pump, pump the mixed reaction liquid from the mixing tube through the first liquid flow meter and the sixth three-way connector to the capillary, and the outgoing light passes through collimator 2 to reduce the divergence angle. Use the optical power detection device to detect the outgoing light power and record the data.

[0014] Finally, the waste liquid is discharged into the waste liquid pipe. During this period, it is necessary to pay attention to the indication of the second liquid flow detector and adjust the pumping rate of the fifth peristaltic pump in time.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0016] 1. By using an automated quantitative liquid sampling device, standardized liquid quantitative sampling is achieved, and the quantitative tube can be replaced immediately according to the detection requirements, thereby improving the detection efficiency, with high accuracy, simple and safe structure, and reusable, and low cost;

[0017] 2. Use coated capillaries instead of traditional cuvettes to increase the optical path, simplify the injection steps, and help improve accuracy;

[0018] 3. It can detect the fluorescence reaction of various substances. For complex water bodies, the detection methods are more diversified than traditional spectrophotometers;

[0019] 4. Only by controlling the peristaltic pump, one-way valve, light source and detection instrument, automatic sample addition, detection and analysis can be realized. The process is simple, the volume is small and portable, and it is suitable for the detection of multiple water quality indicators, with rich application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a schematic structural diagram of a quantitative sample liquid taking device 1 of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the reagent quantitative liquid taking device 2 of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the mixed reaction device 3 of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the hollow-core optical fiber detection device 4 of the present invention. DETAILED DESCRIPTION

[0025] like Figure 1 The automatic quantitative sampling water quality detector can be divided into four parts: sample quantitative liquid collection device 1, reagent quantitative liquid collection device 2, mixed reaction device 3 and hollow fiber detection device 4. The opening and closing of the one-way valve and peristaltic pump are controlled by the controller, which is a circuit board or STM32 single-chip microcomputer. The sample and reagent are both in solution state and can flow in the device through the peristaltic pump.

[0026] like Figure 2 The sample quantitative liquid taking device 1 comprises a sample tube 101, a hose 102, a first peristaltic pump 103, a hose 2 104, a first three-way joint 105, a sample quantitative tube 106, a second three-way joint 107, a hose 3 108, a hose 4 109, and a second peristaltic pump 110. The sample tube 101 is connected to the hose 102. The hose 102 passes through the first peristaltic pump 103 and is connected to the lower port of the first three-way joint 105. The upper port of the first three-way joint 105 is connected to the hose 2 104. The sample quantitative tube 106 is respectively connected to the right port of the first peristaltic pump 103 and the left port of the second three-way joint 107. The lower port of the second three-way joint 107 is connected to the sample tube 101 through the hose 3 108. The upper port of the second three-way joint 107 is connected to the hose 4 109. The hose 4 109 passes through the second peristaltic pump 110 and is connected to the mixing reaction device 3. The hose 3 108 has a first one-way valve 5 that only allows liquid to pass from top to bottom, and the hose 2 104 has a second one-way valve 6 that only allows liquid to pass from top to bottom. The sample quantitative tube 106 is a soft tube, and the length and diameter can be changed according to the specific needs of the quantitative volume.

[0027] like Figure 3The reagent quantitative liquid taking device 2 includes a reagent tube 201, a hose five 202, a third peristaltic pump 203, a third three-way joint 204, a hose six 205, a reagent quantitative tube 206, a fourth three-way joint 207, a hose seven 208, a hose eight 209, and a fourth peristaltic pump 210. The reagent tube 201 is connected to the hose five 202, the hose five 202 passes through the third peristaltic pump 203 and is connected to the lower port of the third three-way joint 204, the upper port of the third three-way joint 204 is connected to the hose six 205, the reagent quantitative tube 206 is respectively connected to the left port of the third three-way joint 204 and the right port of the fourth three-way joint 207, the lower port of the fourth three-way joint 207 is connected to the reagent tube 201 through the hose seven 208, the upper port of the fourth three-way joint 207 is connected to the hose eight 209, and the hose eight 209 passes through the fourth peristaltic pump 210 and is connected to the mixing reaction device 3. A third one-way valve 7 is provided on the hose 6 205 to allow liquid to pass from top to bottom, and a fourth one-way valve 8 is provided on the hose 7 208 to allow liquid to pass from top to bottom.

[0028] like Figure 4 The mixing reaction device 3 includes a mixing tube 301, a hose 9 302, and a fifth peristaltic pump 303. The mixing tube 301 is connected to the hose 9 302. The hose 9 302 passes through the fifth peristaltic pump 303 and is connected to the hollow-core optical fiber detection device 4. The first liquid flow meter 9 is arranged on the hose 9 302.

[0029] like Figure 5 The hollow-core optical fiber detection device 4 includes a fifth three-way connector 401, a capillary 402, a sixth three-way connector 403, a hollow-core optical fiber 404, a collimator 1 405, a switching device 406, a light source 407, a collimator 2 408, an optical power detection device 409, and a hose 10 410. The capillary 402 is connected to the left port of the fifth three-way connector 401 and the right port of the sixth three-way connector 403 respectively. The left port of the sixth three-way connector 403 is connected to the hollow-core optical fiber 404, and the upper port is connected to the hose 9 302 of the mixing reaction device 3; the hollow-core optical fiber 404 is connected to the light source 407 through the collimator 1 405 and the switching device 406; the right port of the fifth three-way connector 401 is connected to the optical power detection device 409 through the collimator 2 408, and the upper port is connected to the waste liquid pipe 10 through the hose 10 410. The outer surface of the capillary 402 is plated with a metal coating and coated with polyimide, and the cut length is about 4 cm. The second liquid flow meter 11 is arranged on the hose 10 410. The light source 407 is an LED parallel light source with a maximum power of 5W and a light emitting aperture of 6mm, and has multiple visible light band light sources and white light sources that can be replaced. The hollow core optical fiber 404 is a plastic optical fiber with a core diameter of 0.5mm and an outer diameter of 2.2mm.

[0030] The method for using the water quality detector of this embodiment includes the following steps:

[0031] (1) First, turn on the power switch to control the first peristaltic pump 103 to turn on. The sample passes through the first peristaltic pump 103 from the sample tube 101, wherein the one-way valve only allows the liquid to pass from top to bottom. The sample then enters the sample quantitative tube 106 until the sample quantitative tube 106 is completely filled with the sample. The excess liquid can be discharged into the sample tube 101 through the first one-way valve 5. Then, turn off the first peristaltic pump 103, turn on the second peristaltic pump 104, and output the sample in the sample quantitative tube 106 to the mixing tube 301, completing the quantitative sampling of the sample.

[0032] (2) The third peristaltic pump 203 is controlled to open, and the detection reagent passes through the third peristaltic pump 203 from the reagent tube 201, wherein the one-way valve only allows the liquid to pass from top to bottom, so it then enters the reagent quantitative tube 206 until the reagent quantitative tube 206 is completely filled with the reagent, and the excess liquid can be discharged into the reagent tube through the fourth one-way valve 8. Then the third peristaltic pump 203 is closed, the third one-way valve 7 and the fourth peristaltic pump 210 are opened, and the reagent in the reagent quantitative tube 206 is output to the mixing tube 301, completing the quantitative sampling of the reagent.

[0033] (3) Then, the light source 407 and the optical power detection device 409 are turned on, and the corresponding wavelength is adjusted by using the switching device 406 to confirm that the input light is coaxial light after passing through the collimator 1 405 and enters the hollow core optical fiber 404. The fifth peristaltic pump 303 is turned on to pump the mixed reaction liquid from the mixing tube 301 through the first liquid flow meter 9 and the sixth three-way connector 403 to the capillary 402. The outgoing light passes through the collimator 2 408 to reduce the divergence angle, and the outgoing light power is detected by the optical power detection device 409 and the data is recorded.

[0034] (4) Finally, the waste liquid is discharged into the waste liquid pipe 10. During this period, it is necessary to observe the reading of the second liquid flow detector 11 and adjust the pumping rate of the fifth peristaltic pump 303 in time.

Claims

1. A water quality detector for automatic quantitative sampling, characterized in that: The invention comprises a sample quantitative liquid taking device (1), a reagent quantitative liquid taking device (2), a mixing reaction device (3), a hollow core optical fiber detection device (4) and a controller, wherein the mixing reaction device (3) is respectively connected to the sample quantitative liquid taking device (1), the reagent quantitative liquid taking device (2) and the hollow core optical fiber detection device (4); the sample quantitative liquid taking device (1) comprises a sample tube (101), a hose 1 (102), a first peristaltic pump (103), a hose 2 (104), a first three-way connector (105), a sample quantitative tube (106), a second three-way connector (107), a hose 3 (108), a hose 4 (109), and a second peristaltic pump (110); the sample tube (101) is connected to the hollow core optical fiber detection device (4) and the controller; The first and second three-way joints (107) are connected to a hose 1 (102), the hose 1 (102) passes through a first peristaltic pump (103) and is connected to a lower port of a first three-way joint (105), the upper port of the first three-way joint (105) is connected to a hose 2 (104), the sample quantitative tube (106) is respectively connected to a right port of the first peristaltic pump (103) and a left port of a second three-way joint (107), the lower port of the second three-way joint (107) is connected to a sample tube (101) through a hose 3 (108), the upper port of the second three-way joint (107) is connected to a hose 4 (109), and the hose 4 (109) passes through a second peristaltic pump (110) and is connected to a mixing reaction device (3).

2. The water quality detector for automatic quantitative sampling according to claim 1, characterized in that: The hose 3 (108) is provided with a first one-way valve (5) that only allows liquid to pass from top to bottom, and the hose 2 (104) is provided with a second one-way valve (6) that only allows liquid to pass from top to bottom.

3. The water quality detector for automatic quantitative sampling according to claim 1, characterized in that: The reagent quantitative liquid taking device (2) comprises a reagent tube (201), a hose five (202), a third peristaltic pump (203), a third three-way connector (204), a hose six (205), a reagent quantitative tube (206), a fourth three-way connector (207), a hose seven (208), a hose eight (209), and a fourth peristaltic pump (210). The reagent tube (201) is connected to the hose five (202), and the hose five (202) passes through the third peristaltic pump (203) and is connected to the lower port of the third three-way connector (204). The upper port of the third three-way joint (204) is connected to the hose six (205), the reagent quantitative tube (206) is respectively connected to the left port of the third three-way joint (204) and the right port of the fourth three-way joint (207), the lower port of the fourth three-way joint (207) is connected to the reagent tube (201) through the hose seven (208), the upper port of the fourth three-way joint (207) is connected to the hose eight (209), and the hose eight (209) passes through the fourth peristaltic pump (210) and is connected to the mixing reaction device (3).

4. The water quality detector for automatic quantitative sampling according to claim 3 is characterized in that: The hose six (205) is provided with a third one-way valve (7) that only allows liquid to pass from top to bottom, and the hose seven (208) is provided with a fourth one-way valve (8) that only allows liquid to pass from top to bottom.

5. The water quality detector for automatic quantitative sampling according to claim 1, characterized in that: The mixing reaction device (3) comprises a mixing tube (301), a hose nine (302), and a fifth peristaltic pump (303); the mixing tube (301) is connected to the hose nine (302); the hose nine (302) passes through the fifth peristaltic pump (303) and is connected to the hollow-core optical fiber detection device (4).

6. The water quality detector for automatic quantitative sampling according to claim 5, characterized in that: A first liquid flow meter (9) is provided on the hose nine (302).

7. The water quality detector for automatic quantitative sampling according to claim 1, characterized in that: The hollow-core optical fiber detection device (4) comprises a fifth three-way connector (401), a capillary tube (402), a sixth three-way connector (403), a hollow-core optical fiber (404), a collimator 1 (405), a switching device (406), a light source (407), a collimator 2 (408), an optical power detection device (409), and a hose 10 (410). The capillary tube (402) is connected to the left port of the fifth three-way connector (401) and the right port of the sixth three-way connector (403), respectively. The left port of the sixth three-way connector (403) is connected to the hollow-core optical fiber (404), and the upper port is connected to the hose nine (302) of the mixing reaction device (3); the hollow-core optical fiber (404) is connected to the light source (407) via the collimator one (405) and the switching device (406); the right port of the fifth three-way connector (401) is connected to the optical power detection device (409) via the collimator two (408), and the upper port is connected to the waste liquid pipe (10) via the hose ten (410).

8. The water quality detector for automatic quantitative sampling according to claim 7, characterized in that: The outer surface of the capillary (402) is plated with a metal coating and coated with polyimide.

9. The water quality detector for automatic quantitative sampling according to claim 7, characterized in that: A second liquid flow meter (11) is provided on the hose ten (410).

10. The water quality detector for automatic quantitative sampling according to claim 7, characterized in that: The light source (407) is an LED parallel light source with a maximum power of 5W and a light-emitting aperture of 5-6mm. It has multiple visible light band light sources and white light sources that can be selected and replaced.

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