Quick calibration device for dissolved oxygen sensor

Abstract

The utility model relates to the technical field of dissolved oxygen sensors, and discloses a quick calibration device for a dissolved oxygen sensor, which comprises a base, a calibration mechanism is arranged at the top of the base, the calibration mechanism comprises an electric heating box and a box cover, and a dissolved oxygen sensor body is arranged on the back of the electric heating box. By arranging the calibration mechanism, the electric heating box can heat water, calibrate the dissolved oxygen sensor body, sequentially introduce oxygen, nitrogen and saturated water vapor, and stir the water, so that the gas and the water are mixed more sufficiently, the dissolved oxygen sensor body is convenient to calibrate, and the calibration accuracy is improved. According to the electric heating box, the lifting mechanism is arranged, the box cover can be lifted by controlling a second motor, the electric heating box can be conveniently placed and taken, and therefore follow-up cleaning is facilitated, and the electric heating box can be fixed by arranging the fixing mechanism, so that the electric heating box is prevented from shaking.

Description

Technical Field

[0001] The utility model relates to the technical field of dissolved oxygen sensors, in particular to a rapid calibration device for dissolved oxygen sensors. Background Art

[0002] The traditional dissolved oxygen sensor calibration method generally uses two-point calibration, namely zero-point calibration and full-scale calibration. The calibration solution and calibration method are as follows: dissolve excess Na2SO3 in distilled water, stir it thoroughly, and let Na2SO3 absorb all the oxygen in the solution to obtain an oxygen-free aqueous solution, and measure the zero-point error of the instrument; at (25±0.5)℃, let air flow into the distilled water to saturate the dissolved oxygen concentration, and then let it stand for a period of time to stabilize the dissolved oxygen, and then measure the range error of the instrument. During the range measurement, the solution needs to be stirred continuously to prevent the dissolved oxygen in the solution at that part from being consumed at the moment of contact with the membrane, which affects the measurement accuracy. The entire measurement process takes a long time, and the zero-point calibration requires the chemical reagent Na2SO3, which is harmful to the eyes, skin, and mucous membranes. It has a stimulating effect, and the calibration produces waste liquid, which is easy to pollute the environment. When calibrating the full scale, in order to achieve oxygen saturation and stable concentration, it is necessary to go through aeration treatment for a sufficiently long time and stand for a certain period of time, so the calibration is time-consuming and the calibration efficiency is low. The most important thing is that this calibration method cannot verify the accuracy of other points within the range of the measuring instrument. In addition, some literature has reported another test method, first prepare saturated N2 solution and saturated O2 solution respectively, and then adjust the flow rate of the peristaltic pump and mix them in different proportions to obtain the oxygen concentration in different solutions, so as to achieve the purpose of dissolving oxygen sensor performance verification. The two saturated N2 solutions and saturated O2 solutions have a long preparation time and poor stability, and are affected by the accuracy of the peristaltic pump, and the dissolved oxygen concentration is difficult to meet the instrument accuracy requirements.

[0003] Chinese patent CN212379385U discloses a dissolved oxygen sensor calibration device, including a calibration chamber, a gas mixing pipeline communicating with the calibration chamber, and an oxygen input interface, a nitrogen input pipe and a saturated water vapor input interface connected to the gas mixing pipeline; the calibration chamber is provided with a liquid seal port communicating with the inner cavity of the calibration chamber and at least two sensor mounting ports, and the dissolved oxygen sensor calibration method uses oxygen, nitrogen, saturated water vapor and a dissolved oxygen sensor calibration device for calibration. The dissolved oxygen sensor has high calibration accuracy, no chemical pollution, simple operation, and high safety during the calibration process, but it is not convenient to clean the interior, and the residual solution will affect the next calibration.

[0004] Therefore, those skilled in the art provide a rapid calibration device for a dissolved oxygen sensor to solve the problems raised in the above background technology. Utility Model Content

[0005] In order to improve the problem that it is inconvenient to clean the inside of a rapid calibration device for a dissolved oxygen sensor, and the residues may easily affect the next calibration, the utility model provides a rapid calibration device for a dissolved oxygen sensor.

[0006] The utility model provides a dissolved oxygen sensor rapid calibration device, which adopts the following technical solutions:

[0007] A rapid calibration device for a dissolved oxygen sensor comprises a base, a calibration mechanism is arranged on the top of the base, the calibration mechanism comprises an electric heating box and a box cover, a dissolved oxygen sensor body is arranged on the back of the electric heating box, a first motor is fixedly installed on the top of the box cover, a stirring rod is fixedly installed on the output shaft of the first motor, an air guide tube is fixedly installed in the inner cavity of the box cover, the top of the air guide tube is connected to an oxygen input tube, one side of the air guide tube is connected to a saturated water vapor input tube, and the other side of the air guide tube is connected to a nitrogen input tube;

[0008] A lifting mechanism is provided on the top of the base, and the lifting mechanism includes a lifting box, the lifting box is fixedly connected to the base, a second motor is fixedly installed on the inner cavity of the lifting box, a one-way threaded rod is fixedly installed on the output shaft of the second motor, a lifting screw block is threadedly connected on the surface of the one-way threaded rod, a connecting rod is fixedly installed on one side of the lifting screw block, and the other end of the connecting rod is fixedly connected to the box cover;

[0009] A fixing mechanism is provided on the top of the base, and the fixing mechanism includes a fixing box, which is fixedly connected to the base, a third motor is fixedly installed on one side of the inner cavity of the fixing box, a bidirectional threaded rod is fixedly installed on the output shaft of the third motor, and thread blocks are threadedly connected on the left and right sides of the surface of the bidirectional threaded rod, and a semicircular clamping plate is fixedly installed on the top of the thread block through a bracket.

[0010] By adopting the above technical scheme, a calibration mechanism is set up, wherein the electric heating box can heat water, the dissolved oxygen sensor body can be calibrated, three gases, oxygen, nitrogen and saturated water vapor, can be introduced in sequence, and the water can be stirred to make the gas and water mix more fully, which is convenient for calibrating the dissolved oxygen sensor body. By setting a lifting mechanism, the box cover can be raised and lowered by controlling the second motor, which is convenient for placing and taking the electric heating box, thereby facilitating subsequent cleaning. By setting a fixing mechanism, the electric heating box can be fixed to prevent the electric heating box from shaking.

[0011] Optionally, the number of the dissolved oxygen sensor bodies is three, and a mounting groove for use with the dissolved oxygen sensor bodies is provided on the back of the electric heating box.

[0012] By adopting the above technical solution, the installation groove is convenient for installing the dissolved oxygen sensor body, three dissolved oxygen sensor bodies can be installed, and the three dissolved oxygen sensor bodies can be calibrated.

[0013] Optionally, a sealing groove is provided on the top of the electric heating box, and a sealing ring is fixedly installed on the bottom of the box cover.

[0014] By adopting the above technical solution, the sealing ring fits into the sealing groove to play a sealing role and prevent water from overflowing or air from leaking.

[0015] Optionally, the inner cavities of the oxygen input pipe, the nitrogen input pipe and the saturated water vapor input pipe are all provided with electronic valves, and the other ends of the oxygen input pipe, the nitrogen input pipe and the saturated water vapor input pipe are all provided with pipeline connecting rings.

[0016] By adopting the above technical solution, the electronic valve is used to control the inlet and outlet of the gas, and the pipeline connecting ring is used to connect the output pipes of each gas generator.

[0017] Optionally, a guide sliding block is fixedly mounted on the other side of the lifting screw block, and a guide sliding groove is provided in the inner cavity of the lifting box.

[0018] By adopting the above technical solution, the guide sliding block and the guide sliding groove are used in combination to guide the lifting screw block, so that the lifting screw block is more stable when moving.

[0019] Optionally, a locating bearing is fixedly installed on the top of the inner cavity of the lifting box, and the locating bearing is rotatably connected to the box cover.

[0020] By adopting the above technical solution, the positioning bearing positions the box cover, making the box cover more stable.

[0021] Optionally, a sliding block is fixedly mounted on the bottom of the threaded block, and a sliding groove is provided in the inner cavity of the fixed box.

[0022] By adopting the above technical solution, the sliding block and the sliding groove are used in combination to guide the threaded block, so that the threaded block is more stable when moving.

[0023] Optionally, a stabilizing bearing is fixedly installed on the other side of the inner cavity of the fixing box, and the stabilizing bearing is rotatably connected to the bidirectional threaded rod.

[0024] By adopting the above technical solution, the positioning of the bidirectional threaded rod by the bearing is stabilized, thereby preventing the bidirectional threaded rod from tilting.

[0025] In summary, the utility model has the following beneficial effects:

[0026] 1. The utility model provides a calibration mechanism, wherein the electric heating box can heat water, can calibrate the dissolved oxygen sensor body, can sequentially introduce three gases, namely oxygen, nitrogen and saturated water vapor, and can stir the water to make the gas and water mix more fully, which is convenient for calibrating the dissolved oxygen sensor body. By providing a lifting mechanism, the box cover can be lifted and lowered by controlling the second motor, which is convenient for placing and taking the electric heating box, thereby facilitating subsequent cleaning. By providing a fixing mechanism, the electric heating box can be fixed to prevent the electric heating box from shaking.

[0027] 2. The utility model is convenient for installing the dissolved oxygen sensor body by setting the installation groove, and three dissolved oxygen sensor bodies can be installed and calibrated. The sealing ring fits with the sealing groove to play a sealing role to prevent water overflow or air leakage. The electronic valve is used to control the inlet and outlet of the gas, and the pipeline connecting ring is used to connect the output pipes of each gas generator. The guide slider is used in conjunction with the guide slide groove to guide the lifting screw block, so that the lifting screw block is more stable when moving. The positioning bearing positions the box cover to make the box cover more stable. The sliding block is used in conjunction with the sliding groove to guide the threaded block, so that the threaded block is more stable when moving. The stabilizing bearing positions the bidirectional threaded rod to prevent the bidirectional threaded rod from tilting. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the utility model.

[0029] Figure 2 It is a schematic diagram of the bottom structure of the box cover of the utility model.

[0030] Figure 3 It is a schematic diagram of the internal structure of the lifting box of the utility model.

[0031] Figure 4 It is a schematic diagram of the back structure of the electric heating box of the utility model.

[0032] Figure 5 It is a cross-sectional structural schematic diagram of a fixing box of the utility model.

[0033] Description of reference numerals:

[0034] 1. Base; 2. Calibration mechanism; 201. Electric heating box; 202. Dissolved oxygen sensor body; 203. Box cover; 204. First motor; 205. Air guide tube; 206. Oxygen input pipe; 207. Nitrogen input pipe; 208. Sealing groove; 209. Sealing ring; 210. Stirring rod; 211. Saturated water vapor input pipe; 3. Lifting mechanism; 301. Lifting box; 302. Second motor; 303. One-way threaded rod; 304. Lifting screw block; 305. Connecting rod; 4. Fixing mechanism; 401. Fixing box; 402. Third motor; 403. Two-way threaded rod; 404. Threaded block; 405. Semicircular clamping plate. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-4 This application is described in further detail.

[0036] Embodiment 1:

[0037] Please refer to Figure 1-5 A rapid calibration device for a dissolved oxygen sensor comprises a base 1, a calibration mechanism 2 is arranged on the top of the base 1, the calibration mechanism 2 comprises an electric heating box 201 and a box cover 203, a dissolved oxygen sensor body 202 is arranged on the back of the electric heating box 201, the number of dissolved oxygen sensor bodies 202 is three, and a mounting groove used in conjunction with the dissolved oxygen sensor body 202 is provided on the back of the electric heating box 201, a first motor 204 is fixedly installed on the top of the box cover 203, a stirring rod 210 is fixedly installed on the output shaft of the first motor 204, an air guide tube 205 is fixedly installed in the inner cavity of the box cover 203, an oxygen input tube 206 is connected to the top of the air guide tube 205, a saturated water vapor input tube 211 is connected to one side of the air guide tube 205, and a nitrogen input tube 207 is connected to the other side of the air guide tube 205, a sealing groove 208 is provided on the top of the electric heating box 201, a sealing ring 209 is fixedly installed on the bottom of the box cover 203, and an oxygen input The inner cavities of the tube 206, the nitrogen input pipe 207 and the saturated water vapor input pipe 211 are all provided with electronic valves, and the other ends of the oxygen input pipe 206, the nitrogen input pipe 207 and the saturated water vapor input pipe 211 are all provided with pipe connecting rings. A lifting mechanism 3 is provided on the top of the base 1, and the lifting mechanism 3 includes a lifting box 301, and the lifting box 301 is fixedly connected to the base 1. The inner cavity of the lifting box 301 is fixedly installed with a second motor 302, and the output shaft of the second motor 302 is fixedly installed with a one-way threaded rod 303. A positioning bearing is fixedly installed on the top of the inner cavity of the lifting box 301, and the positioning bearing is rotatably connected to the box cover 203. The surface of the one-way threaded rod 303 is threadedly connected with a lifting screw block 304, and the other side of the lifting screw block 304 is fixedly installed with a guide slider, and the inner cavity of the lifting box 301 is provided with a guide slot, and a connecting rod 305 is fixedly installed on one side of the lifting screw block 304, and the other end of the connecting rod 305 is fixedly connected to the box cover 203.

[0038] In this embodiment: by setting the calibration mechanism 2, the electric heating box 201 can heat the water, the dissolved oxygen sensor body 202 can be calibrated, the three gases of oxygen, nitrogen and saturated water vapor can be introduced in sequence, and the water can be stirred to make the gas and water mix more fully, which is convenient for calibrating the dissolved oxygen sensor body 202, and by setting the lifting mechanism 3, the box cover 203 can be lifted and lowered by controlling the second motor 302, which is convenient for placing and taking the electric heating box 201, so as to facilitate subsequent cleaning, and the installation slot is convenient for the dissolved oxygen The sensor body 202 is installed, and three dissolved oxygen sensor bodies 202 can be installed and calibrated. The sealing ring 209 fits with the sealing groove 208 to seal and prevent water overflow or air leakage. The electronic valve is used to control the inlet and outlet of the gas. The pipe connecting ring is used to connect the output pipes of each gas generator. The guide slider and the guide groove are used together to guide the lifting screw block 304, so that the lifting screw block 304 is more stable when moving. The positioning bearing positions the box cover 203 to make the box cover 203 more stable.

[0039] Embodiment 2:

[0040] Reference Figure 1 and Figure 5 A fixing mechanism 4 is provided on the top of the base 1, and the fixing mechanism 4 includes a fixing box 401, which is fixedly connected to the base 1, and a third motor 402 is fixedly installed on one side of the inner cavity of the fixing box 401, and a bidirectional threaded rod 403 is fixedly installed on the output shaft of the third motor 402, and a threaded block 404 is threadedly connected on both sides of the left and right sides of the surface of the bidirectional threaded rod 403, and a semicircular clamping plate 405 is fixedly installed on the top of the threaded block 404 through a bracket, and a sliding block is fixedly installed on the bottom of the threaded block 404, and a sliding groove is provided in the inner cavity of the fixing box 401, and a stabilizing bearing is fixedly installed on the other side of the inner cavity of the fixing box 401, and the stabilizing bearing is rotatably connected to the bidirectional threaded rod 403.

[0041] In this embodiment: by setting up a fixing mechanism 4, the electric heating box 201 can be fixed to prevent the electric heating box 201 from shaking. The sliding block and the sliding groove are used in conjunction to guide the threaded block 404, so that the threaded block 404 is more stable when moving. The stable bearing positions the bidirectional threaded rod 403 to prevent the bidirectional threaded rod 403 from tilting.

[0042] The implementation principle of the utility model is as follows: when in use, the third motor 402 is turned on to drive the bidirectional threaded rod 403 to rotate, the bidirectional threaded rod 403 drives the two threaded blocks 404 to approach each other, the two threaded blocks 404 drive the two semicircular clamping plates 405 to fix the electric heating box 201, add water into the electric heating box 201, turn on the heater in the electric heating box 201 to heat the water, and after heating to a suitable temperature, turn on the second motor 302 to drive the unidirectional threaded rod 303 to rotate, the unidirectional threaded rod 303 drives the lifting screw block 304 to move downward, and the lifting screw block 304 The connecting rod 305 is driven to move downward, and the connecting rod 305 drives the box cover 203 downward, so that the sealing ring 209 is stuck in the sealing groove 208, the oxygen input pipe 206 is connected to the oxygen tank, the nitrogen input pipe 207 is connected to the nitrogen tank, and the saturated water vapor input pipe 211 is connected to the saturated water vapor generator. The corresponding electronic valves are opened in sequence to introduce the three gases into the water in the electric heating box 201, and the first motor 204 is turned on to drive the stirring rod 210 to rotate, which can stir the water and accelerate the gas mixing, so as to calibrate the three dissolved oxygen sensor bodies 202.

[0043] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A rapid calibration device for a dissolved oxygen sensor, comprising a base (1), characterized in that: A calibration mechanism (2) is arranged on the top of the base (1), and the calibration mechanism (2) comprises an electric heating box (201) and a box cover (203); a dissolved oxygen sensor body (202) is arranged on the back of the electric heating box (201); a first motor (204) is fixedly mounted on the top of the box cover (203); a stirring rod (210) is fixedly mounted on the output shaft of the first motor (204); an air guide tube (205) is fixedly mounted in the inner cavity of the box cover (203); an oxygen input tube (206) is connected to the top of the air guide tube (205); a saturated water vapor input tube (211) is connected to one side of the air guide tube (205); and a nitrogen input tube (207) is connected to the other side of the air guide tube (205); A lifting mechanism (3) is provided on the top of the base (1), and the lifting mechanism (3) comprises a lifting box (301), the lifting box (301) is fixedly connected to the base (1), a second motor (302) is fixedly installed in the inner cavity of the lifting box (301), a one-way threaded rod (303) is fixedly installed on the output shaft of the second motor (302), a lifting screw block (304) is threadedly connected on the surface of the one-way threaded rod (303), a connecting rod (305) is fixedly installed on one side of the lifting screw block (304), and the other end of the connecting rod (305) is fixedly connected to the box cover (203); A fixing mechanism (4) is arranged on the top of the base (1), and the fixing mechanism (4) comprises a fixing box (401), and the fixing box (401) is fixedly connected to the base (1); a third motor (402) is fixedly installed on one side of the inner cavity of the fixing box (401); a bidirectional threaded rod (403) is fixedly installed on the output shaft of the third motor (402); thread blocks (404) are threadedly connected on both left and right sides of the surface of the bidirectional threaded rod (403); and a semicircular clamping plate (405) is fixedly installed on the top of the thread block (404) via a bracket.

2. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: The number of the dissolved oxygen sensor bodies (202) is three, and a mounting groove for use with the dissolved oxygen sensor bodies (202) is provided on the back of the electric heating box (201).

3. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: A sealing groove (208) is provided on the top of the electric heating box (201), and a sealing ring (209) is fixedly installed on the bottom of the box cover (203).

4. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: The inner cavities of the oxygen input pipe (206), the nitrogen input pipe (207) and the saturated water vapor input pipe (211) are all provided with electronic valves, and the other ends of the oxygen input pipe (206), the nitrogen input pipe (207) and the saturated water vapor input pipe (211) are all provided with pipe connection rings.

5. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: A guide sliding block is fixedly mounted on the other side of the lifting screw block (304), and a guide sliding groove is provided in the inner cavity of the lifting box (301).

6. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: A positioning bearing is fixedly installed on the top of the inner cavity of the lifting box (301), and the positioning bearing is rotatably connected to the box cover (203).

7. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: A sliding block is fixedly mounted on the bottom of the threaded block (404), and a sliding groove is provided in the inner cavity of the fixing box (401).

8. A rapid calibration device for a dissolved oxygen sensor according to claim 1, characterized in that: A stabilizing bearing is fixedly mounted on the other side of the inner cavity of the fixing box (401), and the stabilizing bearing is rotatably connected to the bidirectional threaded rod (403).

Images