Sampling device for measuring phosphorus pentoxide in air

Abstract

The utility model relates to the technical field of gas content measurement, in particular to a sampling device for measuring phosphorus pentoxide in air, which comprises a sampling pipe, a gas inlet, a liquid inlet and a gas outlet are arranged on the sampling pipe, a liquid outlet is arranged at the bottom of the sampling pipe, a gas inlet pipe is inserted into the gas inlet, and a liquid inlet pipe is inserted into the liquid inlet. The air outlet is connected with a negative pressure device, the air inlet pipe is connected with an air sampling assembly, the air sampling assembly comprises a telescopic air collecting pipe and a power unit used for driving the air collecting pipe to change in the height direction, and one end of the air collecting pipe is communicated with the air inlet pipe. The length of the air collecting pipe is freely adjusted through the power unit, so that gases at different heights can be collected, the content of phosphorus pentoxide in the air at different heights can be detected, the detection range is widened, the defects caused by adopting a filter membrane mode can be avoided, phosphorus pentoxide in the air can be absorbed, and the detection efficiency is improved. And the detection accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas content measurement, in particular to a sampling device for measuring phosphorus pentoxide in the air. Background Art

[0002] Phosphorus pentoxide, also known as phosphoric anhydride, is typically a white, highly deliquescent crystalline powder. It is a common raw material and reagent in the chemical industry, widely used in pharmaceuticals, coating additives, dyeing and printing auxiliaries, antistatic agents, titanate coupling agents, and phosphorus oxychloride. It is primarily used in the manufacture of high-purity phosphoric acid, as a gaseous and liquid desiccant, a dehydrating agent in organic synthesis, and in the preparation of organophosphates. Although non-flammable, phosphorus pentoxide reacts violently with water and organic matter such as wood, cotton, and grass, releasing heat and potentially causing combustion. Contact with water produces large amounts of smoke and heat, and when exposed to moisture, it is mildly corrosive to most metals. Phosphorus pentoxide is a strong local irritant. Vapor and dust can severely irritate the eyes, mucous membranes, skin, and respiratory system, and can corrode the skin and mucous membranes. When the concentration of phosphorus pentoxide in air exceeds 1 mg / m³, long-term exposure can cause tracheitis, emphysema, chronic rhinitis, and calcium-phosphorus metabolism disorders. High concentrations can cause instantaneous fainting.

[0003] The process of collecting phosphorus pentoxide in the air is very easily affected by weather factors. Traditional membrane filter sampling usually fixes the filter membrane in one place, uses a negative pressure device to create negative pressure, and then draws in the outside air through the filter membrane. However, the outside air is easily mixed with moisture. When phosphorus pentoxide meets water, it will react and stick to the filter membrane, causing the filter membrane to be easily blocked. The negative pressure device cannot draw air, which in turn affects the determination of the phosphorus pentoxide content in the air. In addition, the phosphorus pentoxide content in the air at different altitudes may vary. This fixed air detection is likely to further affect the accuracy of the measurement results. Utility Model Content

[0004] The utility model aims to provide a sampling device for measuring phosphorus pentoxide in the air, which solves the problems of low accuracy of detection results and narrow detection range.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] The present sampling device for measuring phosphorus pentoxide in the air comprises a sampling tube, the sampling tube having an air inlet, a liquid inlet and an air outlet, the bottom of the sampling tube having a liquid outlet, an air inlet pipe inserted into the air inlet, a liquid inlet pipe inserted into the liquid inlet, a negative pressure device connected to the air outlet, an air sampling assembly connected to the air inlet pipe, the air sampling assembly comprising a retractable air collection tube and a power unit for driving the air collection tube to change in height, one end of the air collection tube being connected to the air inlet pipe.

[0007] By adopting the above technical solution: an air sampling component is set up. Since the air sampling component has a retractable air collection tube, air enters from the top of the air collection tube and the air collection tube can be extended and shortened. The length of the air collection tube can be freely adjusted by the power unit so that gas at different heights can be collected, and then the content of phosphorus pentoxide in the air at different heights can be detected, thereby improving the detection range. Secondly, it can avoid the defects of the filter membrane method, and all phosphorus pentoxide in the air can be absorbed, thereby improving the accuracy of detection.

[0008] The air sampling assembly includes a bracket, which is fixed to the upper end of the sampling tube. The bottom end of the air collection tube is sealed and nested in the top end of the intake pipe. The air collection tube has at least two tube bodies nested with each other. The power unit includes a lifter installed on the bracket. The top end of the lifter is connected to a clamping arm. The tube body at the top of the air collection tube is fixedly connected to the clamping arm.

[0009] By adopting the above technical solution: a bracket is further provided, and the air collection pipe is composed of multiple pipe bodies, and the extension and shortening of the air collection pipe is achieved by installing a lifter on the bracket.

[0010] A retaining frame is provided above the bracket, and at least one guide assembly is provided between the retaining frame and the bracket. The guide assembly includes a guide sleeve and a guide rod that are nested with each other. A guide hole corresponding to the guide sleeve is opened on the bracket, and the top end of the guide sleeve is connected to the guide hole accordingly. The guide rod extends upward from the guide hole and is fixedly connected to the retaining frame.

[0011] By adopting the above technical solution: when the air collection tube changes, it will drive the guide rod to slide along the guide sleeve, thereby ensuring that the air collection tube has sufficient stability and effectively avoiding violent shaking when the air collection tube reaches a certain height.

[0012] The lifter is selected from one of an electric telescopic rod, a pneumatic telescopic rod or a hydraulic telescopic rod, and the negative pressure device is selected from an air pump.

[0013] By adopting the above technical solution: reasonably choose the lifter that can be purchased on the market to save costs.

[0014] The negative pressure device is installed on the upper end surface of the bracket, and an air extraction pipe is led out from the air extraction port of the negative pressure device. One end of the air extraction pipe is connected to the air outlet, and the air outlet is arranged on the side of the sampling tube.

[0015] By adopting the above technical solution: one end of the air extraction pipe is connected to the air outlet to suck air from the sampling pipe, and the air outlet is arranged on the side of the sampling pipe to cooperate with the negative pressure device.

[0016] One end of the liquid inlet tube is connected to a reagent preparation component, which is provided with a syringe pump and a liquid collector, and the liquid collector is connected to an infusion tube and several liquid collection tubes, one end of the infusion tube is connected to one end of each liquid collection tube, and the other end of each liquid collection tube is connected to a reagent bottle, and the other end of the infusion tube is connected to the liquid inlet tube, and one end of the syringe pump is connected to the infusion tube. Valve bodies are installed on both the infusion tube and the liquid collection tube, and the syringe pump can suck the reagent in each reagent bottle into the infusion tube by controlling each valve body.

[0017] By adopting the above technical solution: the reagent preparation component is used to provide operation between the injection pump, infusion tube and liquid collection tube, ensuring that the corresponding reagent can be accurately and automatically injected into the sampling tube, ensuring that personnel have no contact with the reagent during the detection process.

[0018] Both the infusion tube and the liquid collection tube are equipped with one-way valves, and the flow direction of the one-way valves is arranged according to the flow from the liquid collection tube to the infusion tube.

[0019] By adopting the above technical solution: setting the flow direction of the one-way valve to flow from the liquid collection tube to the liquid infusion tube, the same operation between the injection pump, the liquid infusion tube and the liquid collection tube can also be achieved.

[0020] The bottom end of the sampling tube is provided with a transmitting port and a receiving port. The transmitting port is provided with a measurement generating device, and the receiving port is provided with a measurement receiving device. The measurement generating device and the measurement receiving device are electrically connected.

[0021] By adopting the above technical solution: air is sucked into the sampling tube, phosphorus pentoxide in the air is first absorbed by the absorption liquid, and then the injection pump injects the corresponding detection reagent into the sampling tube through the infusion tube and the corresponding liquid collection tube, so that the detection reagent and phosphorus pentoxide fully react, and then the absorbance of the solution in the sampling tube is accurately measured by the measurement generating device, thereby determining the content of phosphorus pentoxide.

[0022] The technical effects and advantages of this utility model are:

[0023] 1. In this solution, an air sampling assembly is provided. Since the air sampling assembly has a retractable air collection tube, air enters from the top of the air collection tube and the air collection tube can be extended and shortened. The length of the air collection tube can be freely adjusted by the power unit so that gas at different heights can be collected. The content of phosphorus pentoxide in the air at different heights can then be detected, thereby increasing the detection range. Secondly, the defects of the filter membrane method can be avoided, and all phosphorus pentoxide in the air can be absorbed, thereby improving the accuracy of the detection.

[0024] 2. In this solution, when the air collection tube changes, it will drive the guide rod to slide along the guide sleeve, thereby ensuring that the air collection tube has sufficient stability and effectively preventing the air collection tube from shaking violently when it reaches a certain height. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of an embodiment of the present invention is provided;

[0026] Figure 2 A diagram showing the working principle of the reagent preparation assembly provided by the present invention;

[0027] Figure 3 for Figure 1 A cross-sectional view of the sampling device of the embodiment;

[0028] Figure 4 A cross-sectional view of a sampling device provided in another embodiment of the present invention.

[0029] Figure numerals: 1. bracket; 2. sampling tube; 201. air inlet; 202. liquid inlet; 203. liquid outlet; 3. negative pressure device; 4. liquid inlet pipe; 5. air inlet pipe; 6. lifter; 7. guide sleeve; 8. guide rod; 9. air outlet; 10. air collection tube; 11. exhaust pipe; 12. injection pump; 13. liquid collector; 14. liquid collection tube; 15. infusion tube; 16. reagent bottle; 17. clamping arm; 18. retaining frame; 19. telescopic tube; 20. rope; 21. transmitting port; 22. receiving port. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] This embodiment provides Figure 1A sampling device for measuring phosphorus pentoxide in the air is shown, and the sampling device includes a sampling tube 2. The sampling tube 2 of this embodiment is a Bao gas collection tube, and its top has an air inlet 201, a liquid inlet 202 and a neck-shaped air outlet 9, and the bottom of the sampling tube 2 has a liquid outlet 203, wherein an air inlet pipe 5 is inserted into the air inlet 201, a liquid inlet pipe 4 is inserted into the liquid inlet 202, a negative pressure device 3 is connected to the air outlet 9, and an air sampling assembly is connected to the air inlet pipe 5. The air sampling assembly includes a retractable air collection tube 10 and a power unit for driving the air collection tube 10 to change in height. The bottom end of the air collection tube 10 is connected to the air inlet pipe 5. Start the negative pressure device 3 so that air can be sucked into the sampling tube 2 from the air inlet 201, and pure water can be injected into the sampling tube 2 through the liquid inlet 202 as an absorption liquid for absorbing phosphorus pentoxide in the air. It should be noted that the bottom ends of the air inlet pipe 5 and the sampling tube 2 need to be below the liquid level of the absorption liquid. Since an air sampling component is provided, and the air sampling component has a retractable air collection tube 10, air enters from the top of the air collection tube 10 and the air collection tube 10 can be extended and shortened. The length of the air collection tube 10 can be freely adjusted by the power unit so that gas at different heights can be collected. In this embodiment, the air collection tube 10 can reach more than 2 meters after being unfolded, and the height change of the air collection tube 10 can be selected according to the height of the site.

[0032] Furthermore, the air sampling assembly includes a bracket 1, which is fixed to the upper end surface of the sampling tube 2, and the bottom end of the air collection tube 10 is sealed and nested in the top end of the air inlet pipe 5. Specifically, Figure 3 As shown, in this embodiment, the air collection tube 10 has two nested tube bodies, and the power unit includes a lifter 6 installed on the bracket 1, the top of the lifter 6 is connected to the clamping arm 17, the bottom end of the tube body located on the outside is fixedly connected to the bracket 1, and the top end of the tube body located on the inside is fixedly connected to the clamping arm 17.

[0033] In another embodiment, the air collection tube 10 has three mutually nested tube bodies. An air collection tube 10 with multiple tube bodies can be selected according to the height.

[0034] In the above embodiment, the lifter 6 can be selected from an electric telescopic rod, a pneumatic telescopic rod or a hydraulic telescopic rod, and the negative pressure device 3 can be selected from an air pump.

[0035] Furthermore, a retaining frame 18 is provided above the bracket 1 of the above embodiment, and at least one guide assembly is provided between the retaining frame 18 and the bracket 1. In order to ensure stability, two guide assemblies are provided in this embodiment. Figure 1As shown, the guide assembly comprises a nested guide sleeve 7 and a guide rod 8. Bracket 1 is provided with a guide hole corresponding to guide sleeve 7. The top end of guide sleeve 7 is connected to the guide hole. Guide rod 8 extends upward from the guide hole and is fixedly connected to retainer 18. When air collection tube 10 is moved, it drives guide rod 8 to slide along guide sleeve 7, thereby ensuring sufficient stability of air collection tube 10 and preventing severe shaking when air collection tube 10 reaches a certain height.

[0036] In another embodiment, Figure 4 As shown, when the height of the air collection tube 10 exceeds the length of the hoist 6 on the market, a high-altitude sling method can be used, that is, a fixed point is set up on the ceiling or high in the air, a fixed pulley is installed on the fixed point, and then a rope 20 is passed through the fixed pulley. One end of the rope 20 is connected to the top of the air collection tube 10, and one end of the rope 20 is connected to a hoist or a winder. When the hoist or winder is started, the air collection tube 10 is extended or shortened. In this embodiment, the air collection tube 10 can reach 3 to 5 meters after being unfolded.

[0037] Furthermore, the air collection tube 10 of this embodiment can adopt a telescopic tube 19 , one end of the telescopic tube 19 is sleeved with one end of the air inlet pipe 5 , and the other end is connected to the rope 20 .

[0038] In the above embodiment, if Figure 1 As shown, in order to facilitate the installation of the negative pressure device 3, the negative pressure device 3 can be optionally installed on the upper end surface of the bracket 1, so that an exhaust pipe 11 is led out from the exhaust port of the negative pressure device 3, and one end of the exhaust pipe 11 is connected to the air outlet 9 to suck air from the sampling tube 2, wherein the air outlet 9 of this embodiment is arranged on the side of the sampling tube 2.

[0039] In addition, in order to fully illustrate this solution, a reagent preparation component is also connected to one end of the liquid inlet tube 4, such as Figure 2 As shown in the figure, the reagent preparation component is provided with an injection pump 12 and a liquid collector 13, and the liquid collector 13 is connected to an infusion tube 15 and several liquid collection tubes 14, one end of the infusion tube 15 is connected to one end of each liquid collection tube 14, and the other end of each liquid collection tube 14 is connected to a reagent bottle 16, and the other end of the infusion tube 15 is connected to the liquid inlet tube 4. One end of the injection pump 12 is connected to the infusion tube 15, and valve bodies are installed on the infusion tube 15 and the liquid collection tube 14. The valve body on the infusion tube 15 is arranged close to the side of the liquid inlet tube 4, and the injection pump 12 is controlled to suck the reagent in each reagent bottle 16 into the infusion tube 15.

[0040] In the previous embodiment, the solenoid valves on the infusion tube 15 and the liquid collection tube 14 can also be replaced with one-way valves. The flow direction of the one-way valves is set according to the flow from the liquid collection tube 14 to the infusion tube 15, and the same operation between the injection pump 12, the infusion tube 15 and the liquid collection tube 14 can also be achieved.

[0041] This solution supplements the phosphorus pentoxide measurement method. The bottom end of the sampling tube 2 is provided with a transmitting port 21 and a receiving port 22. A measurement generator is mounted on the transmitting port 21, and a measurement receiver is mounted on the receiving port 22. The two devices are electrically connected. Air is drawn into the sampling tube 2, where the phosphorus pentoxide in the air is first absorbed by an absorbent solution. A syringe pump 12 then injects a corresponding detection reagent into the sampling tube 2 via an infusion tube 15 and a corresponding liquid extraction tube 14, allowing the reagent to fully react with the phosphorus pentoxide. The absorbance of the solution in the sampling tube 2 is detected by the measurement generator. The phosphorus pentoxide reacts with the detection reagent to produce a blue color, which is measured under visible light at 700 nm. The measurement receiver receives the absorbance value measured by the measurement generator and transmits it back to the control unit, where it is displayed on the display input unit. The method for calculating phosphorus pentoxide through absorbance measurement refers to Section 3, "Method Principle," of the environmental standard HJ546-2015. For details on how to convert absorbance into concentration, please refer to Section 8 "Analysis Procedure" and Section 9 "Calculation and Presentation of Results" in HJ546-2015.

[0042] This protocol uses pure water as an absorption liquid to absorb phosphorus pentoxide from the air. When phosphorus pentoxide in the air comes into contact with pure water, a chemical reaction occurs, producing orthophosphoric acid and metaphosphoric acid, which remain in the water. Refer to Section 3, "Principles of the Method," of HJ546-2015. The difference between the absorption liquid and the detection reagent is that the absorption liquid is used solely to absorb phosphorus pentoxide from the air and dissolve it into the pure water. The solution formed by the absorption of phosphorus pentoxide by pure water cannot be used directly to measure its concentration. This is because at 700nm, a blue substance is measured; the darker the blue, the higher the phosphorus pentoxide concentration. However, the absorption liquid is colorless and transparent at this point. To achieve a blue color, a detection reagent is added. This chemical reaction between the dissolved phosphorus pentoxide in the absorption liquid and the detection reagent produces a blue color. For details, refer to Section 3, "Principles of the Method" of HJ546-2015.

[0043] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sampling device for measuring phosphorus pentoxide in air, comprising a sampling tube (2), characterized in that: The sampling tube (2) has an air inlet (201), a liquid inlet (202) and an air outlet (9); the bottom of the sampling tube (2) has a liquid outlet (203); an air inlet pipe (5) is inserted into the air inlet (201); a liquid inlet pipe (4) is inserted into the liquid inlet (202); a negative pressure device (3) is connected to the air outlet (9); the air inlet pipe (5) is connected to an air sampling assembly, the air sampling assembly comprising a retractable air collection tube (10) and a power unit for driving the air collection tube (10) to change in height; one end of the air collection tube (10) is connected to the air inlet pipe (5).

2. A sampling device for measuring phosphorus pentoxide in air as claimed in claim 1, characterized in that: The air sampling assembly comprises a bracket (1), the bracket (1) is fixed to the upper end of the sampling tube (2), the bottom end of the air collection tube (10) is sealed and nested in the top end of the air inlet pipe (5), the air collection tube (10) has at least two mutually nested tube bodies, the power unit comprises a lifter (6) mounted on the bracket (1), the top end of the lifter (6) is connected to a clamping arm (17), and the tube body located at the top of the air collection tube (10) is fixedly connected to the clamping arm (17).

3. A sampling device for measuring phosphorus pentoxide in air as claimed in claim 2, characterized in that: A retaining frame (18) is provided above the bracket (1), and at least one guide assembly is provided between the retaining frame (18) and the bracket (1), wherein the guide assembly comprises a guide sleeve (7) and a guide rod (8) nested with each other, and a guide hole corresponding to the guide sleeve (7) is provided on the bracket (1), the top end of the guide sleeve (7) is connected to the guide hole, and the guide rod (8) extends upward from the guide hole and is fixedly connected to the retaining frame (18).

4. A sampling device for measuring phosphorus pentoxide in air according to claim 2 or 3, characterized in that: The lifter (6) is selected from one of an electric telescopic rod, a pneumatic telescopic rod or a hydraulic telescopic rod, and the negative pressure device (3) is selected from an air pump.

5. A sampling device for measuring phosphorus pentoxide in air as claimed in claim 4, characterized in that: The negative pressure device (3) is installed on the upper end surface of the bracket (1), and an air extraction pipe (11) is led out from the air extraction port of the negative pressure device (3). One end of the air extraction pipe (11) is connected to the air outlet (9), and the air outlet (9) is arranged on the side of the sampling tube (2).

6. A sampling device for measuring phosphorus pentoxide in air according to any one of claims 1 to 3, characterized in that: One end of the liquid inlet pipe (4) is connected to a reagent preparation assembly, which is provided with a syringe pump (12) and a liquid extractor (13). The liquid extractor (13) is connected to an infusion pipe (15) and a plurality of liquid extraction pipes (14). One end of the infusion pipe (15) is connected to one end of each liquid extraction pipe (14), and the other end of each liquid extraction pipe (14) is connected to a reagent bottle (16). The other end of the infusion pipe (15) is connected to the liquid inlet pipe (4), and one end of the syringe pump (12) is connected to the infusion pipe (15). Valve bodies are installed on the infusion pipe (15) and the liquid extraction pipe (14). By controlling each valve body, the syringe pump (12) can suck the reagent in each reagent bottle (16) into the infusion pipe (15).

7. A sampling device for measuring phosphorus pentoxide in air as claimed in claim 6, characterized in that: Both the liquid infusion tube (15) and the liquid collection tube (14) are equipped with one-way valves, and the flow direction of the one-way valves is arranged so that the liquid flows from the liquid collection tube (14) to the liquid infusion tube (15).

8. A sampling device for measuring phosphorus pentoxide in air as claimed in claim 6, characterized in that: The bottom end of the sampling tube (2) is provided with a transmitting port (21) and a receiving port (22); a measurement generating device is installed on the transmitting port (21); a measurement receiving device is installed on the receiving port (22); and the measurement generating device and the measurement receiving device are electrically connected.

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