Safety energy-saving perchloric acid fume hood

Abstract

The application provides a safe energy-saving perchloric acid fume hood, and relates to the technical field of fume hoods.The fume hood comprises a cabinet body and a storage cabinet, and the inner cavity of the cabinet body is provided with a scrubbing assembly for cleaning the inner wall of the cabinet body.The scrubbing assembly comprises a lifting frame, a spray pipe and a soft scraper.The lifting frame has a U-shaped structure, the spray pipe is fixedly installed at the middle part of the bottom end of the lifting frame, a plurality of groups of spray heads are equidistantly arranged at the outer side end of the spray pipe, the spray heads are obliquely installed, the spray direction of the spray heads is towards the inner wall of the cabinet body, the soft scraper is arranged at the outer side end of the lifting frame, and the soft scraper is in contact with the inner wall of the cabinet body.The lifting frame is driven to move up and down by an electric push rod, the spray pipe sprays cleaning liquid and the soft scraper scrapes the inner wall of the cabinet body, the automatic cleaning of the inner wall of the cabinet body is realized, the whole cleaning process does not need manual direct contact with harmful substances in the cabinet, the safety risk of personnel is greatly reduced, and the professional health of the operator is ensured.

Description

Technical Field

[0001] This invention relates to the field of fume hood technology, specifically a safe and energy-saving perchloric acid fume hood. Background Technology

[0002] Perchloric acid is a commonly used strong oxidizing acid in chemical analysis laboratories. Its use typically requires heating, which generates a large amount of perchloric acid mist. Perchloric acid mist is highly corrosive and oxidizing, and under certain conditions, it can react with organic matter to form explosive perchlorates. Therefore, perchloric acid experiments must be conducted in a dedicated perchloric acid fume hood.

[0003] Traditional perchloric acid fume hoods typically only have basic exhaust functions. Their inner walls are prone to condensation of white crystals (perchlorate) due to prolonged contact with perchloric acid fumes. These crystals not only corrode the hood but also pose serious safety hazards. Currently, cleaning these crystals mainly relies on manual wiping. Because the internal space of the fume hood is narrow, especially in the passageway behind the air guide plates, traditional fume hood air guide plates are often bolted on. Each cleaning requires repeated disassembly and reassembly of the bolts, making the operation extremely inconvenient. Furthermore, the cleaning process involves direct contact with hazardous substances, posing a high safety risk.

[0004] To address the aforementioned issues, we propose a safe and energy-efficient perchloric acid fume hood. Summary of the Invention

[0005] To address the problems in the background art, the present invention provides a safe and energy-saving perchloric acid fume hood.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A safe and energy-saving perchloric acid fume hood includes a cabinet body and a storage cabinet. The inner cavity of the cabinet body is equipped with a scrubbing assembly for cleaning the inner wall of the cabinet body. The scrubbing assembly includes a lifting frame, a spray pipe, and a soft scraper. The lifting frame has a U-shaped structure. The spray pipe is fixedly installed at the bottom center of the lifting frame. Multiple spray heads are evenly spaced on the outer end of the spray pipe. The spray heads are installed at an angle, and their spray direction is towards the inner wall of the cabinet body. The soft scraper is located on the outer end of the lifting frame and is in close contact with the inner wall of the cabinet body. The top of the washing assembly is equipped with a lifting assembly, which is used to drive the lifting frame to move vertically. The lifting assembly includes two sets of electric push rods, which are fixedly installed on both sides of the top of the cabinet. The output end of the electric push rod is fixedly connected to the lifting frame. The inner cavity of the cabinet is also equipped with a first air guide plate and a second air guide plate, as well as a support frame for installing the first air guide plate and the second air guide plate.

[0007] Preferably, the first air guide plate is installed vertically on the back of the inner cavity of the cabinet, and the second air guide plate is installed obliquely on the top of the inner cavity of the cabinet. Multiple sets of mounting rods are provided in the middle of the inner side of the support frame. Multiple sets of mounting rings that are compatible with the mounting rods are provided on the back of both the first and second air guide plates. Both the first and second air guide plates are snapped onto the outer surface of the support frame by the mounting rings. This structure makes it easy to disassemble and assemble the air guide plates, and facilitates later maintenance or replacement.

[0008] Preferably, an operating table is provided at the bottom of the inner cavity of the cabinet, and an opening is reserved between the operating table and the inner wall of the cabinet for the flow of spray water. The opening design ensures that the cleaning waste liquid can be discharged smoothly downwards to avoid liquid accumulation.

[0009] Preferably, a water collection hopper is provided at the bottom of the inner cavity of the cabinet. The water collection hopper is located at the bottom center of the operating table. The bottom outlet of the water collection hopper extends to the outside of the cabinet through a hose. The water collection hopper can effectively collect cleaning wastewater and guide it to an external collection or treatment device through the hose.

[0010] Preferably, guide components are provided on both sides of the upper end of the lifting frame. The guide components include two sets of guide rods. The guide rods are fixedly installed on the upper end surface of the lifting frame and are located on both sides of the electric push rod. The guide rods are slidably connected to the top of the cabinet. The guide components can ensure the smooth operation of the lifting frame during the lifting process and prevent deviation.

[0011] Preferably, the outer end of the lifting frame is provided with mounting slots in a circumferential direction, and the soft scraper is inserted and installed in the mounting slots. By means of the slot insertion, the soft scraper can be easily replaced when it is worn.

[0012] Preferably, an air collecting hood is provided at the top center of the cabinet, and a ventilation pipe is provided at the top center of the air collecting hood. The air collecting hood is used to collect air inside the cabinet and is connected to the external exhaust system through the ventilation pipe.

[0013] Preferably, the top of the support frame is provided with a fixing rod, which allows the support frame to be fixedly installed in the inner cavity of the cabinet.

[0014] Preferably, the inlet end of the spray pipe is connected to a water supply tank via a flexible hose.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes an electric push rod to drive a lifting frame to move up and down, which in turn drives the spray pipes to spray cleaning fluid and the soft scraper to scrape the inner wall of the cabinet, thus achieving automated cleaning of the cabinet's inner wall. The entire cleaning process eliminates the need for direct manual contact with harmful substances inside the cabinet, greatly reducing personnel safety risks and protecting the occupational health of operators. The tilted spray head design allows the cleaning fluid to be sprayed directly onto the inner wall of the cabinet, and combined with the physical scraping action of the soft scraper, it can efficiently remove perchlorate crystals adhering to the inner wall. The cleaning effect is significantly better than traditional manual wiping, resulting in high cleaning efficiency and reduced downtime for maintenance.

[0016] In this invention, the air guide plate is assembled by snapping it with the mounting rod of the support frame through a mounting ring. Each time it is disassembled and assembled, there is no need to repeatedly twist the fixing bolts, which makes disassembly and replacement convenient and simple, saves time, and effectively reduces maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the frontal planar structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the side cross-section structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 5 This is a top view schematic diagram of the lifting frame structure in this invention; Figure 6 This is a schematic diagram of the support frame in this invention.

[0018] In the diagram: 1. Cabinet; 2. Storage cabinet; 3. Air collector hood; 4. Ventilation duct; 5. Lifting frame; 6. Spray pipe; 7. Spray head; 8. Mounting slot; 9. Soft scraper; 10. Electric push rod; 11. Operating table; 12. Through port; 13. Water collection hopper; 14. First air guide plate; 15. Second air guide plate; 16. Mounting retainer; 17. Support frame; 18. Mounting rod; 19. Fixing rod; 20. Guide rod. Detailed Implementation

[0019] The technical solution in this application embodiment is to solve the problems of the background technology mentioned above. The overall idea is as follows: The present invention provides a safe and energy-saving perchloric acid fume hood. By setting a U-shaped lifting frame 5 to drive the spray pipe 6 and the soft scraper 9 to lift synchronously, the automatic cleaning of the inner walls of the cabinet 1 is realized, which effectively avoids the operator's direct contact with harmful residues and improves safety. In addition, by setting the two air guide plates as a snap-fit ​​installation structure (the cooperation of the installation ring 16 and the installation rod 18), the installation and removal of the air guide plates can be completed without the aid of any external tools. The installation and removal can be completed by manual pressing. The air guide plates can be removed by a single person in a few seconds, which greatly shortens the downtime for daily maintenance and cleaning.

[0020] Example: Refer to Figure 1 - Figure 6 As shown in the figure, this embodiment of a safe and energy-saving perchloric acid fume hood is mainly used for exhaust and self-cleaning of the cabinet body 1 during experiments such as perchloric acid digestion and heating.

[0021] The fume hood of this invention comprises a cabinet body 1 and a storage cabinet 2 located at the bottom of the cabinet body 1. The front of the cabinet body 1 has an open operating port, which is equipped with a sliding door as in the prior art, for laboratory personnel to operate. An air collecting hood 3 is located at the top center of the cabinet body 1, and a ventilation pipe 4 is connected to the top center of the air collecting hood 3 for connecting to the laboratory's central exhaust system. The entire structure is made of corrosion-resistant material.

[0022] Inside the cabinet 1, a core cleaning assembly for cleaning the inner walls is installed. This assembly mainly consists of a lifting frame 5, spray pipes 6, and a soft scraper 9. The lifting frame 5 has a U-shaped structure, conforming to the shape of the inner wall of the cabinet 1. The spray pipes 6 are fixedly installed at the bottom center of the lifting frame 5 and arranged along its direction. Multiple spray heads 7 are evenly spaced on the outer end face of the spray pipes 6; all spray heads 7 are angled, with their spray outlets facing the inner wall of the cabinet 1 (including the left, right, and rear walls) to ensure that the cleaning solution can be directly sprayed onto the surfaces requiring cleaning.

[0023] The inlet end of the spray pipe 6 passes through the top of the cabinet 1 via a flexible hose and is connected to the water supply tank. The water supply tank can be filled with a special cleaning and neutralizing solution. When in use, the cleaning solution in the water supply tank is pumped to the spray pipe 6 by a water pump or other equipment for spraying and rinsing.

[0024] An installation slot 8 is provided on the outer end of the lifting frame 5 (i.e. the side opposite to the inner wall of the cabinet 1). The soft scraper 9 is inserted into the installation slot 8, and the blade of the soft scraper 9 is in close contact with the inner wall of the cabinet 1. The soft scraper 9 can be made of acid and alkali resistant rubber or polytetrafluoroethylene.

[0025] The washing assembly is equipped with a lifting assembly at the top, which includes two sets of electric push rods 10. The housings of the two sets of electric push rods 10 are respectively fixedly installed on the left and right sides of the top of the cabinet 1, and their telescopic output ends pass vertically downward through the top wall of the cabinet 1 and are fixedly connected to the top crossbeam of the lifting frame 5.

[0026] To ensure the stability of the lifting frame 5 during the lifting process, guide components are provided on both sides of the upper end face of the lifting frame 5. The guide components include two guide rods 20, and the upper ends of the guide rods 20 are slidably connected to the linear bearings or guide sleeves on the top of the cabinet 1.

[0027] An air guiding structure is installed at the rear of the inner cavity of the cabinet 1, including a first air guide plate 14, a second air guide plate 15, and a support frame 17. The support frame 17 is fixedly installed on the top wall of the inner cavity of the cabinet 1 by a fixing rod 19 at its top.

[0028] Multiple mounting rods 18 are horizontally arranged in the middle of the inner side of the support frame 17. The first air guide plate 14 is arranged vertically and located at the rear of the inner cavity of the cabinet 1; the second air guide plate 15 is arranged at an angle and located at the top corner of the inner cavity of the cabinet 1. The back of both the first air guide plate 14 and the second air guide plate 15 are provided with mounting rings 16. By snapping the mounting rings 16 onto the mounting rods 18, the two air guide plates can be quickly installed and removed, which facilitates the quick assembly and disassembly of the first air guide plate 14 and the second air guide plate 15 by the staff, thus providing convenience for cleaning operations.

[0029] An operating table 11 is provided at the bottom of the inner cavity of the cabinet 1 for placing experimental instruments and conducting experimental operations. A gap 12 is reserved between the four edges of the operating table 11 and the four inner walls of the cabinet 1 to form an opening. The opening 12 allows the cleaning liquid dripping from the inner wall to flow down and collect in the collection hopper 13 below. Directly below the operating table 11, the bottom of the cabinet 1 is provided with a collection hopper 13. The collection hopper 13 is funnel-shaped, and its bottom outlet extends to the outside of the cabinet 1 through a drain hose, which can be connected to a waste liquid treatment system.

[0030] The working principle of this invention is: During normal experimental conditions, the electric push rod 10 is in the retracted state, and the lifting frame 5 is located above the inner cavity of the cabinet 1, without affecting the experimental operation. Under the negative pressure of the exhaust system, the perchloric acid mist generated in the experiment flows smoothly to the air collection hood 3 under the guidance of the first air guide plate 14 and the second air guide plate 15, and is discharged through the ventilation pipe 4, effectively reducing the retention of acid mist in the cabinet.

[0031] When the experiment is completed or the inner wall of cabinet 1 needs cleaning, the staff initiates the cleaning procedure. First, the external water supply tank pumps cleaning solution through a water pump, which is then supplied to the spray pipe 6 via a hose. Simultaneously, the electric push rod 10 slowly extends, driving the lifting frame 5 to move vertically downwards at a uniform speed. During this process, the tilted spray head 7 continuously sprays cleaning solution onto the left, right, and rear inner walls of cabinet 1, wetting and dissolving the perchlorate crystals adhering to the inner walls; then, the soft scraper 9 follows closely behind, scraping away the moistened crystals and dirt from the inner walls.

[0032] The scraped-off waste liquid and the remaining spray liquid flow down the inner wall, through the openings 12 around the operating table 11 into the water collection hopper 13 below, and finally out of the cabinet through the drain hose.

[0033] Once the electric push rod 10 extends to its limit position (i.e., the lifting frame 5 descends to the bottom), the cleaning is complete. Subsequently, the electric push rod 10 retracts, causing the lifting frame 5 to rise and return to its original position. This process is repeated multiple times until the entire cleaning process is finished. The electric push rod 10 then causes the lifting frame 5 to return to its original position, ready for the next experiment.

[0034] If the back of the air guide plate needs to be cleaned or replaced, simply pull the first air guide plate 14 or the second air guide plate 15 outwards to disengage the mounting ring 16 from the mounting rod 18 and remove the entire air guide plate.

[0035] In summary, the perchloric acid fume hood provided by this invention achieves automatic cleaning and convenient disassembly and assembly of the air guide plate, has significant safety features, and meets the stringent requirements of modern laboratories.

[0036] The safe and energy-saving perchloric acid fume hood proposed in this invention has a reliable structure and a high degree of automation. It can effectively solve the problems of cabinet contamination and safety hazards caused by perchloric acid experiments. It is suitable for chemical laboratories in various research institutes, universities and testing institutions, and has broad prospects for industrial application.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A safe and energy-saving perchloric acid fume hood, comprising a cabinet body (1) and a storage cabinet (2), characterized in that: The inner cavity of the cabinet (1) is provided with a washing assembly for cleaning the inner wall of the cabinet (1); The washing assembly includes a lifting frame (5), a spray pipe (6), and a soft scraper (9). The lifting frame (5) has a "U" shaped structure. The spray pipe (6) is fixedly installed at the bottom center of the lifting frame (5). Multiple spray heads (7) are equidistantly arranged on the outer end of the spray pipe (6). The spray heads (7) are installed at an angle, and their spraying direction is towards the inner wall of the cabinet (1). The soft scraper (9) is located on the outer end of the lifting frame (5) and is in close contact with the inner wall of the cabinet (1). The top of the washing assembly is provided with a lifting assembly, which is used to drive the lifting frame (5) to move vertically. The lifting assembly includes two sets of electric push rods (10). The electric push rods (10) are fixedly installed on both sides of the top of the cabinet (1). The output end of the electric push rods (10) is fixedly connected to the lifting frame (5). The inner cavity of the cabinet (1) is also provided with a first air guide plate (14) and a second air guide plate (15), as well as a support frame (17) for installing the first air guide plate (14) and the second air guide plate (15).

2. The safe and energy-saving perchloric acid fume hood according to claim 1, characterized in that, The first air guide plate (14) is installed vertically on the back of the inner cavity of the cabinet (1), and the second air guide plate (15) is installed at an angle on the top of the inner cavity of the cabinet (1). Multiple sets of mounting rods (18) are provided in the middle of the inner side of the support frame (17). Multiple sets of mounting rings (16) that are compatible with the mounting rods (18) are provided on the back of both the first air guide plate (14) and the second air guide plate (15). Both the first air guide plate (14) and the second air guide plate (15) are attached to the outer surface of the support frame (17) by the mounting rings (16).

3. The safe and energy-saving perchloric acid fume hood according to claim 2, characterized in that, An operating table (11) is provided at the bottom of the inner cavity of the cabinet (1), and an opening (12) for the flow of spray water is reserved between the operating table (11) and the inner wall of the cabinet (1).

4. A safe and energy-saving perchloric acid fume hood according to claim 3, characterized in that, The cabinet (1) has a water collection hopper (13) at the bottom of its inner cavity. The water collection hopper (13) is located at the bottom center of the operating table (11). The bottom outlet of the water collection hopper (13) extends to the outside of the cabinet (1) through a flexible hose.

5. A safe and energy-saving perchloric acid fume hood according to claim 1, characterized in that, The upper sides of the lifting frame (5) are provided with guide components. The guide components include two sets of guide rods (20). The guide rods (20) are fixedly installed on the upper surface of the lifting frame (5) and are located on both sides of the electric push rod (10). The guide rods (20) are slidably connected to the top of the cabinet (1).

6. A safe and energy-saving perchloric acid fume hood according to claim 5, characterized in that, The outer end of the lifting frame (5) is provided with mounting slots (8) in a circumferential direction, and the soft scraper (9) is inserted and installed in the mounting slots (8).

7. A safe and energy-saving perchloric acid fume hood according to claim 1, characterized in that, The top center of the cabinet (1) is provided with an air collecting hood (3), and the top center of the air collecting hood (3) is provided with a ventilation pipe (4).

8. A safe and energy-saving perchloric acid fume hood according to claim 1, characterized in that, The top of the support frame (17) is provided with a fixing rod (19), which allows the support frame (17) to be fixedly installed in the inner cavity of the cabinet (1).

9. A safe and energy-saving perchloric acid fume hood according to claim 1, characterized in that, The inlet end of the spray pipe (6) is connected to a water supply tank via a flexible hose.

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