A perchloric acid fume hood

Abstract

The application discloses a perchloric acid fume hood, and relates to the field of fume hoods.The fume hood comprises a fume hood body and an exhaust pipe, a spraying assembly for mixing acid mist is arranged on the fume hood body, the spraying assembly comprises a drain pipe arranged in the exhaust pipe, and a baffle is fixedly connected to one side of the drain pipe on the top wall of the fume hood body.The application is provided by cooperation of the exhaust pipe, the drain pipe and the baffle and the like.In use, the alkali solution in an alkali solution barrel is conveyed into the drain pipe by starting a magnetic pump, the alkali solution enters into the shunt pipe and the water conveying pipe, and then is sprayed out through the first spraying head and the second spraying head, so that the acid mist in the exhaust pipe is firstly mixed with the alkali solution sprayed out by the first spraying head, the acid mist is diluted, then the acid mist passes the baffle close to the second spraying head, the alkali solution sprayed out by the second spraying head is mixed with the acid mist for the second time, and the problem that the applicability is reduced due to the fact that the acid mist is directly and simply diluted and treated and the acid mist is difficult to be fully treated is avoided.

Description

Technical Field

[0001] This application relates to the field of fume hoods, and more particularly to a perchloric acid fume hood. Background Technology

[0002] Fume hoods are among the most important safety devices in modern laboratories. They maintain sufficient negative pressure within the hood through an exhaust system, ensuring that personnel and the experimental environment are protected from chemical contamination. Fume hoods have a strict airflow control system. In many metal pretreatment experiments, perchloric acid often reacts with alkali metals, producing large amounts of acid mist. This perchloric acid is dispersed into the fume hood by the airflow and, when released directly into the air through exhaust ducts, pollutes the atmosphere.

[0003] Most existing fume hoods rely on simple filter plates and direct water spraying for dilution, which makes it difficult to effectively treat acid mist, thus reducing their applicability. Utility Model Content

[0004] To address the aforementioned problems, this application provides a perchloric acid fume hood.

[0005] The perchloric acid fume hood provided in this application adopts the following technical solution: A perchloric acid fume hood includes a fume hood body and an exhaust duct. The fume hood body is equipped with a spray assembly for mixing acid mist. The spray assembly includes a drain pipe disposed within the exhaust duct. A baffle is fixedly connected to the top wall of the fume hood body on one side of the drain pipe, with a gap between the bottom end of the baffle and the fume hood body. An air inlet is opened at the top of one side wall of the exhaust duct. A diversion pipe is fixedly connected to one side of the top of the drain pipe, with the end of the diversion pipe away from the drain pipe penetrating the baffle. A plurality of equidistant first spray heads are fixedly connected to the side wall of the diversion pipe. A water supply pipe is fixedly connected to one side of the top of the drain pipe, and a plurality of second spray heads are fixedly connected to the side wall of the water supply pipe. The fume hood body is equipped with a water supply assembly for providing alkaline solution.

[0006] By adopting the above technical solution, during use, the acid mist generated by the perchloric acid experiment inside the fume hood enters the exhaust duct and is discharged through the air collection hood. The alkaline solution is then transported to the drain pipe through the water supply component, allowing the alkaline solution to enter the distribution pipe and the water supply pipe. It is then sprayed out through the first and second spray heads. The acid mist entering the exhaust duct first mixes with the alkaline solution sprayed from the first spray head, thus diluting the acid mist. Then, the acid mist passes through the baffle and approaches the second spray head, where the alkaline solution sprayed from the second spray head mixes with the acid mist a second time. This method avoids the problem of simply spraying water to dilute the acid mist directly, which would make it difficult to fully treat the acid mist and reduce its applicability.

[0007] Preferably, the water supply assembly includes an alkaline solution tank fixedly connected to the bottom of the inside of the fume hood body. A magnetic pump for drawing alkaline solution is installed on one side of the alkaline solution tank at the bottom of the inside of the fume hood body. The water outlet of the magnetic pump is fixedly connected to one end of the drain pipe. An air collecting hood is installed at the top of the inside of the fume hood body, and the top of the exhaust pipe is located below the air collecting hood.

[0008] By adopting the above technical solutions, the alkali solution in the alkali tank can be conveniently transported to the drain pipe by starting the magnetic pump, so that the first and second spray heads can spray the alkali solution to treat the acid mist.

[0009] Preferably, a circulating water tank is fixedly connected to the bottom of the interior of the fume hood body, the circulating water tank is connected to the alkali tank, and a return water pipe is fixedly connected to the top of the circulating water tank, with the top of the return water pipe located at the bottom of the interior of the exhaust pipe.

[0010] By adopting the above technical solution, the alkaline solution sprayed from the first and second spray heads can be collected and recycled through the circulating water tank and return water pipe, thereby reducing resource waste.

[0011] Preferably, a pH meter for detecting acid and alkalinity is installed at the bottom of one side wall of the circulating water tank, an inlet pipe is installed at the top of one side wall of the circulating water tank, and an outlet pipe is installed at the bottom of one side wall of the circulating water tank.

[0012] By adopting the above technical solution, the alkaline solution in the circulating water tank is tested with a pH meter. When the alkaline solution is found to be incompatible, it is discharged by opening the outlet pipe, and then new alkaline solution is added through the inlet pipe.

[0013] Preferably, the exhaust duct sidewall is equipped with a deflector plate for guiding airflow.

[0014] By adopting the above technical solution, the guide plate can make the acid mist enter the exhaust pipe evenly, reduce the dead zone of airflow, and prevent the acid mist from remaining in the fume hood body.

[0015] Preferably, an operating table is fixedly connected to the bottom of the fume hood body on one side of the exhaust pipe, and a lighting lamp is installed at the top of the fume hood body.

[0016] By adopting the above technical solution, the interior of the fume hood is illuminated by a light, making it convenient for personnel to conduct experiments on the operating table.

[0017] Preferably, a mesh plate is fixedly connected to the bottom of the exhaust pipe, the upper surface of the mesh plate is in contact with the bottom of the baffle, and multiple PP balls are placed on the upper surface of the mesh plate below the second spray head.

[0018] By adopting the above technical solution, when the acid mist passes through the exhaust pipe, the PP pellets come into contact with the acid mist, which can purify the acid mist, reduce the volatilization and diffusion of the acid mist, and improve the dilution effect of the acid mist.

[0019] Preferably, a discharge pipe is fixedly connected to the bottom end of one side wall of the exhaust pipe above the mesh plate. The end of the discharge pipe away from the exhaust pipe passes through the fume hood body and forms a fixed connection. A cover plate is provided at one end of the discharge pipe, and a sealing block adapted to the discharge pipe is fixedly connected to one side wall of the cover plate.

[0020] By adopting the above technical solution, the sealing block can be pulled out of the discharge pipe by pulling the cover plate, making it easy to remove the PP ball stack from the exhaust pipe for replacement.

[0021] Preferably, a plurality of fixing bolts are provided on one side wall of the cover plate, and all the fixing bolts penetrate the cover plate and are threadedly connected to the discharge pipe.

[0022] By adopting the above technical solution, the cover plate is fixedly connected to the discharge pipe with fixing bolts to prevent the cover plate from falling off during use.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes the coordinated design of exhaust pipes, drain pipes, and baffles. During use, the acid mist generated by the perchloric acid experiment within the fume hood enters the exhaust pipe and is discharged through the air collection hood. Meanwhile, the alkaline solution is transported to the drain pipe via a water supply assembly, allowing it to enter the distribution pipe and water supply pipe. The solution is then sprayed out through the first and second spray heads. The acid mist entering the exhaust pipe first mixes with the alkaline solution sprayed from the first spray head, diluting the acid mist. Then, the acid mist passes through the baffle and approaches the second spray head, where the alkaline solution sprayed from the second spray head further mixes with the acid mist. This design minimizes the need for simple water dilution, which would otherwise be insufficient to treat the acid mist and reduce its applicability. 2. When acid mist passes through the exhaust pipe, the PP pellets come into contact with the acid mist, which can purify the acid mist, reduce the volatilization and diffusion of the acid mist, and improve the dilution effect of the acid mist. At the same time, by pulling the cover plate, the sealing block can be pulled out of the discharge pipe, making it easy to remove the PP pellets from the exhaust pipe for replacement. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a perchloric acid fume hood according to an embodiment of this application; Figure 2 This is a side view schematic diagram illustrating the internal structure of the fume hood body, which is the main embodiment of this application. Figure 3 The embodiments of this application mainly embody Figure 2A schematic diagram of the enlarged structure of region A in the middle; Figure 4 This is an exploded view of the connection structure between the discharge pipe and the cover plate, which is the main embodiment of this application.

[0025] Attached reference numerals: 1. Fume hood body; 2. Air collection hood; 3. Exhaust pipe; 4. Alkali tank; 5. Magnetic pump; 6. Drain pipe; 7. Baffle; 8. Air inlet; 9. Diverter pipe; 10. First spray head; 11. Water supply pipe; 12. Second spray head; 13. Circulating water tank; 14. Return water pipe; 15. pH meter; 16. Water inlet pipe; 17. Water outlet pipe; 18. Guide plate; 19. Operating table; 20. Lighting lamp; 21. Mesh plate; 22. PP ball stack; 23. Discharge pipe; 24. Cover plate; 25. Sealing block; 26. Fixing bolt. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0027] This application discloses a perchloric acid fume hood.

[0028] Reference Figure 1 , Figure 2 and Figure 3 A perchloric acid fume hood includes a fume hood body 1 and an exhaust pipe 3. The exhaust pipe 3 is disposed inside the fume hood body 1 and its two ends are fixedly connected to the fume hood body 1. The fume hood body 1 is provided with a spray assembly for mixing acid mist. The spray assembly includes a drain pipe 6, a baffle 7, an air inlet 8, a diversion pipe 9, a first spray head 10, a water supply pipe 11, and a second spray head 12. The drain pipe 6 is installed inside the exhaust pipe 3. The baffle 7 is fixedly connected to the top wall of the fume hood body 1 and located on one side of the drain pipe 6. A certain gap is left between the bottom end of the baffle 7 and the fume hood body 1 for gas flow. The air inlet 8 is opened at the top of one side wall of the exhaust pipe 3. The diversion pipe 9 is fixedly connected to one side of the top of the drain pipe 6. The end of the diversion pipe 9 away from the drain pipe 6 passes through the baffle 7. Multiple first spray heads 10 are provided, all fixedly connected to the side wall of the diversion pipe 9 and arranged at equal intervals. The water supply pipe 11 is fixedly connected to one side of the top of the drain pipe 6. Multiple second spray heads 12 are provided, all fixedly connected to the side wall of the water supply pipe 11. The fume hood body 1 is provided with a water supply component for providing alkaline solution.

[0029] Reference Figure 1 and Figure 2The water supply assembly includes an alkali tank 4 fixedly connected to the bottom of the fume hood body 1. A magnetic pump 5 for drawing alkali is installed on one side of the alkali tank 4 at the bottom of the fume hood body 1. The water outlet of the magnetic pump 5 is fixedly connected to one end of the drain pipe 6. An air collecting hood 2 is installed at the top of the fume hood body 1. The top of the exhaust pipe 3 is located below the air collecting hood 2. By starting the magnetic pump 5, the alkali in the alkali tank 4 is conveniently transported to the drain pipe 6, so that the first spray head 10 and the second spray head 12 spray alkali to treat the acid mist.

[0030] Reference Figure 1 and Figure 2 A circulating water tank 13 is fixedly connected to the bottom of the fume hood body 1. The circulating water tank 13 is connected to the alkali tank 4. A return water pipe 14 is fixedly connected to the top of the circulating water tank 13. The top of the return water pipe 14 is located at the bottom of the exhaust pipe 3. Through the circulating water tank 13 and the return water pipe 14, the alkali sprayed by the first spray head 10 and the second spray head 12 can be collected and recycled to reduce resource waste.

[0031] Reference Figure 2 and Figure 3 A pH meter 15 for detecting acidity and alkalinity is installed at the bottom of one side wall of the circulating water tank 13. An inlet pipe 16 is installed at the top of one side wall of the circulating water tank 13, and an outlet pipe 17 is installed at the bottom of one side wall of the circulating water tank 13. Valves are installed on both the inlet pipe 16 and the outlet pipe 17. The pH meter 15 is used to detect the alkaline solution in the circulating water tank 13. When the alkaline solution is found to be incompatible, it is discharged by opening the outlet pipe 16, and then new alkaline solution is added through the inlet pipe 17.

[0032] Reference Figure 2 The exhaust duct 3 is equipped with a baffle plate 18 for guiding airflow. The baffle plate 18 can make the acid mist enter the exhaust duct 3 evenly, reduce the dead zone of airflow, and prevent the acid mist from remaining in the fume hood body 1.

[0033] Reference Figure 2 An operating table 19 is fixedly connected to the bottom of the fume hood body 1 on one side of the exhaust pipe 3. A lighting lamp 20 is installed at the top of the inside of the fume hood body 1 to illuminate the inside of the fume hood body 1, making it convenient for personnel to conduct experiments on the operating table 19.

[0034] Reference Figure 2 and Figure 3 A mesh plate 21 is fixedly connected to the bottom of the exhaust pipe 3. The upper surface of the mesh plate 21 is attached to the bottom of the baffle 7. Multiple PP balls 22 are placed on the upper surface of the mesh plate 21 below the second spray head 12. The PP balls 22 are multi-faceted hollow spheres made of PP material. When the acid mist passes through the exhaust pipe 3, the PP balls 22 come into contact with the acid mist, which can purify the acid mist, reduce the volatilization and diffusion of the acid mist, and improve the dilution effect of the acid mist.

[0035] Reference Figure 2 , Figure 3 and Figure 4 A discharge pipe 23 is fixedly connected to the bottom of one side wall of the exhaust pipe 3 above the mesh plate 21. The end of the discharge pipe 23 away from the exhaust pipe 3 passes through the fume hood body 1 and forms a fixed connection. A cover plate 24 is provided at one end of the discharge pipe 23. A sealing block 25 that matches the discharge pipe 23 is fixedly connected to one side wall of the cover plate 24. By pulling the cover plate 24, the sealing block 25 can be pulled out from the discharge pipe 23, making it convenient to remove the PP ball stack 22 from the exhaust pipe 3 for replacement.

[0036] Reference Figure 4 The cover plate 24 has multiple fixing bolts 26 on one side wall. The fixing bolts 26 all pass through the cover plate 24 and are threadedly connected to the discharge pipe 23. The cover plate 24 and the discharge pipe 23 are fixedly connected by the fixing bolts 26 to prevent the cover plate 24 from falling off during use.

[0037] The implementation principle of a perchloric acid fume hood according to an embodiment of this application is as follows: During use, the acid mist generated by the experiment in the fume hood body 1 enters the exhaust pipe 3 and is discharged through the air collection hood 2. At the same time, the magnetic pump 5 is activated to transport the alkaline solution in the alkaline solution tank 4 to the drain pipe 6, so that the alkaline solution enters the diversion pipe 9 and the water supply pipe 11, and then is sprayed out through the first spray head 10 and the second spray head 12. The acid mist entering the exhaust pipe 3 is first mixed with the alkaline solution sprayed by the first spray head 10 to dilute the acid mist. Then, the acid mist passes through the baffle 7 and approaches the second spray head 12, so that the alkaline solution sprayed by the second spray head 12 mixes the acid mist a second time. At the same time, when the acid mist passes through the exhaust pipe 3, the PP ball 22 comes into contact with the acid mist, which can purify the acid mist, reduce the volatilization and diffusion of the acid mist, improve the dilution effect of the acid mist, and avoid the problem of simply spraying water to dilute the acid mist directly, which is difficult to fully treat the acid mist and reduces its applicability.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A perchloric acid fume hood, comprising a fume hood body (1) and an exhaust pipe (3), wherein the fume hood body (1) is provided with a spray assembly for mixing acid mist, characterized in that: The spray assembly includes a drain pipe (6) installed in the exhaust pipe (3). A baffle (7) is fixedly connected to the top wall of the fume hood body (1) on one side of the drain pipe (6). A gap is left between the bottom end of the baffle (7) and the fume hood body (1). An air inlet (8) is opened at the top of one side wall of the exhaust pipe (3). A diversion pipe (9) is fixedly connected to one side of the top of the drain pipe (6). The end of the diversion pipe (9) away from the drain pipe (6) passes through the baffle (7). A plurality of first spray heads (10) are fixedly connected to the side wall of the diversion pipe (9) at equal intervals. A water supply pipe (11) is fixedly connected to one side of the top of the drain pipe (6). A plurality of second spray heads (12) are fixedly connected to the side wall of the water supply pipe (11). A water supply assembly for providing alkaline solution is provided on the fume hood body (1).

2. The perchloric acid fume hood according to claim 1, characterized in that: The water supply assembly includes an alkaline tank (4) fixedly connected to the bottom of the inside of the fume hood body (1). A magnetic pump (5) for drawing alkaline solution is installed at the bottom of the inside of the fume hood body (1) on one side of the alkaline tank (4). The water outlet of the magnetic pump (5) is fixedly connected to one end of the drain pipe (6). An air collecting hood (2) is installed at the top of the inside of the fume hood body (1). The top of the exhaust pipe (3) is located below the air collecting hood (2).

3. A perchloric acid fume hood according to claim 2, characterized in that: A circulating water tank (13) is fixedly connected to the bottom of the interior of the fume hood body (1). The circulating water tank (13) is connected to the alkali tank (4). A return water pipe (14) is fixedly connected to the top of the circulating water tank (13). The top of the return water pipe (14) is located at the bottom of the interior of the exhaust pipe (3).

4. A perchloric acid fume hood according to claim 3, characterized in that: A pH meter (15) for detecting acid and alkalinity is installed at the bottom of one side wall of the circulating water tank (13), an inlet pipe (16) is installed at the top of one side wall of the circulating water tank (13), and an outlet pipe (17) is installed at the bottom of one side wall of the circulating water tank (13).

5. A perchloric acid fume hood according to claim 4, characterized in that: The exhaust pipe (3) has a guide plate (18) installed on its side wall to guide the airflow.

6. A perchloric acid fume hood according to claim 5, characterized in that: An operating table (19) is fixedly connected to the bottom of the fume hood body (1) on one side of the exhaust pipe (3), and a lighting lamp (20) is installed at the top of the fume hood body (1).

7. A perchloric acid fume hood according to claim 6, characterized in that: The bottom of the exhaust pipe (3) is fixedly connected to a mesh plate (21). The upper surface of the mesh plate (21) is in contact with the bottom of the baffle (7). Multiple PP balls (22) are placed on the upper surface of the mesh plate (21) below the second spray head (12).

8. A perchloric acid fume hood according to claim 7, characterized in that: The bottom of one side wall of the exhaust pipe (3) is fixedly connected to a discharge pipe (23) above the mesh plate (21). The end of the discharge pipe (23) away from the exhaust pipe (3) passes through the fume hood body (1) and forms a fixed connection. One end of the discharge pipe (23) is provided with a cover plate (24). A sealing block (25) that is compatible with the discharge pipe (23) is fixedly connected to one side wall of the cover plate (24).

9. A perchloric acid fume hood according to claim 8, characterized in that: The cover plate (24) has multiple fixing bolts (26) on one side wall. The fixing bolts (26) all penetrate the cover plate (24) and are threadedly connected to the discharge pipe (23).

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