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CN-121988157-A - Closed purification type chemical experiment safety demonstration device

CN121988157ACN 121988157 ACN121988157 ACN 121988157ACN-121988157-A

Abstract

The invention discloses a closed purification type chemical experiment safety demonstration device, and belongs to the field of chemical flue gas recovery. The device includes the demonstration table body, and demonstration table body rear side is equipped with glass panels, and both sides are equipped with the back curb plate of taking negative pressure suction pump, and this internal one-level purification mechanism and the second grade purification mechanism of being equipped with of demonstration table. The first-stage purification mechanism comprises a spiral pipe and a liquid medicine nozzle, and the second-stage purification mechanism comprises an elastic rubber pipe and a sponge filter body inside the elastic rubber pipe. The invention combines negative pressure suction to realize the source trapping of harmful gas, utilizes Venturi effect, ultrasonic atomization and centrifugal gas-liquid separation to form primary purification, and cooperates with a self-adaptive extension sponge filter body to realize secondary deep adsorption, thereby effectively solving the problem that the purification of poisonous gas such as nitrogen oxides is not thorough. The device also has the functions of recycling the gas cleaning agent, spraying according to the requirement and automatically cleaning the sponge filter body, remarkably reduces the health risks of teachers and students, has compact structure and convenient operation, and is suitable for the experiment demonstration of toxic gas in classroom teaching.

Inventors

  • Ding Haozhan
  • XIANG YUBIN
  • LI YAN

Assignees

  • 南京信息工程大学

Dates

Publication Date
20260508
Application Date
20260409

Claims (10)

  1. 1. The utility model provides a seal purification formula chemistry experiment safety presentation device, includes demonstration table body (1), its characterized in that, the both sides of demonstration table body (1) are provided with back suction subassembly (2), back suction subassembly (2) are including setting up back suction curb plate (21) in demonstration table body (1) both sides, the end of giving vent to anger of back suction curb plate (21) is provided with negative pressure suction pump (24), the rear side of demonstration table body (1) is provided with glass panel (5), the inside one-level purification mechanism (3) and the second grade purification mechanism (4) that are provided with of demonstration table body (1); the primary purification mechanism (3) comprises a spiral pipe (324), a liquid medicine nozzle (323) is arranged on the spiral pipe (324), the air inlet end of the spiral pipe (324) is connected with the air outlet end of the negative pressure suction pump (24), and the air outlet end of the spiral pipe (324) is connected with the secondary purification mechanism (4); The secondary purification mechanism (4) comprises an elastic rubber tube (432), a sponge filter body (433) is arranged in the elastic rubber tube (432), and the air inlet end of the elastic rubber tube (432) is connected with the air outlet end of the spiral tube (324).
  2. 2. The closed purification type chemical experiment safety demonstration device according to claim 1 is characterized in that a spiral rib (44) with a hollow structure is arranged in a pipe wall of the elastic rubber pipe (432), a soaking nozzle (434) is arranged on the inner side of the spiral rib (44), a fixed end plate (431) is arranged at an air inlet end of the elastic rubber pipe (432), and a free end plate (437) is arranged at an air outlet end of the elastic rubber pipe (432).
  3. 3. The sealed purification type chemical experiment safety demonstration device according to claim 2, wherein the air outlet end of the elastic rubber tube (432) is provided with a scrubbing assembly (45), the scrubbing assembly comprises a fixed box (451) arranged on the inner side of the demonstration table body (1), a blowing and sucking pump (452) is arranged in the fixed box (451), an air guide hose (455) is arranged on the blowing and sucking pump (452), the air guide hose (455) penetrates through the upper side of the free end plate (437) and is communicated with the interior of the elastic rubber tube (432), and the blowing and sucking pump (452) is arranged above the elastic rubber tube (432); An anti-irrigation expansion box (454) is arranged between the air guide hose (455) and the blowing and sucking pump (452), and an exhaust valve (453) is arranged at the exhaust end of the air guide hose (455).
  4. 4. The sealed purification type chemical experiment safety demonstration device according to claim 2, wherein a liquid-feeding cavity (441) is arranged in the spiral rib (44) in a penetrating manner, a liquid inlet end of the soaking nozzle (434) is communicated with the liquid-feeding cavity (441), and a liquid outlet end of the soaking nozzle (434) is communicated with the inside of the sponge filter body (433); The liquid feeding device is characterized in that a plug (442) is further arranged in a liquid feeding cavity (441) at the bottom of the spiral rib (44), the plug (442) corresponds to the liquid feeding end of the soaking nozzle (434) up and down, the plug (442) is connected with a connecting rod (443), the connecting rod (443) penetrates through the side wall of the spiral rib (44) in a sliding mode, a buoyancy block (445) is arranged at the top end of the connecting rod (443), the buoyancy block (445) is located above the spiral rib (44), a telescopic sealing cover (444) is arranged between the buoyancy block (445) and the spiral rib (44), and the sealing cover (444) is sleeved outside the connecting rod (443).
  5. 5. The safety demonstration device for the closed purification type chemical experiment according to claim 1, wherein a liquid return pipe (436) is arranged at the bottom of the exhaust end of the elastic rubber pipe (432), a liquid return valve (4361) is arranged on the liquid return pipe (436), and the liquid outlet end of the liquid return pipe (436) is communicated with a liquid medicine nozzle (323); An ultrasonic vibrator (322) is arranged outside the liquid medicine nozzle (323), and the liquid medicine nozzle (323) is positioned at the air inlet end of the spiral pipe (324).
  6. 6. The closed purification type chemical experiment safety demonstration device according to claim 5, wherein the air inlet end of the spiral tube (324) is provided with a first expansion tube (31), the air outlet end of the spiral tube (324) is provided with a second expansion tube (33), two ends of the spiral tube (324) are respectively and smoothly communicated with the first expansion tube (31) and the second expansion tube (33), the air inlet end of the first expansion tube (31) is connected with the air outlet end of the negative pressure suction pump (24), the air outlet end of the second expansion tube (33) is provided with a gas transmission tube (438), and the gas transmission tube (438) is communicated with the bottom of the air inlet end of the elastic rubber tube (432) through a one-way exhaust valve (4371) and an air supply valve (4372); The second expansion pipe (33) is vertically arranged, the air outlet end of the spiral pipe (324) is communicated with the side wall of the second expansion pipe (33) and is mutually perpendicular, and the bottom of the second expansion pipe (33) is provided with a liquid discharge nozzle (331).
  7. 7. The safety demonstration device for closed purification type chemical experiment according to claim 6, wherein a liquid diversion trench (3241) is integrally formed on one side of the wall of the spiral tube (324), and the spiral radius of the liquid diversion trench (3241) is larger than that of the spiral tube (324).
  8. 8. The sealed purification type chemical experiment safety demonstration device according to claim 6, wherein a heat preservation cover (321) is wrapped on the spiral outer side of the spiral pipe (324), a cooling piece (325) is arranged on the spiral inner side of the spiral pipe (324), a heating piece (327) is wrapped on the outer side of the gas transmission pipe (438), the cooling piece (325) and the heating piece (327) are made of heat conducting materials, a semiconductor refrigerator (326) is further arranged in the demonstration table body (1), a refrigerating surface of the semiconductor refrigerator (326) is in heat transfer contact with the cooling piece (325), and a heating surface of the semiconductor refrigerator (326) is in heat transfer contact with the heating piece (327).
  9. 9. The closed purification type chemical experiment safety demonstration device according to claim 2, wherein a plurality of telescopic rods (42) are arranged between the fixed end plate (431) and the free end plate (437), the telescopic rods (42) are distributed outside the elastic rubber tube (432) in parallel, a corrugated pipe sleeve (421) is sleeved outside the telescopic rods (42), the telescopic rods (42) are obliquely arranged, and the fixed end plate (431) is higher than the free end plate (437).
  10. 10. The closed purification type chemical experiment safety demonstration device according to claim 1, wherein the sponge filter body (433) is made of a sponge-like composite elastic material, a back suction net surface (23) is arranged on one side opposite to the two back suction side plates (21), and a filter plate (22) is arranged inside the back suction side plates (21).

Description

Closed purification type chemical experiment safety demonstration device Technical Field The invention relates to the technical field of chemical flue gas recovery, in particular to a closed purification type chemical experiment safety demonstration device. Background The chemical experiment is an important practical link in the chemical teaching of the higher universities, and the student is helped to convert abstract theoretical knowledge into specific cognition and understanding through visual phenomenon display. The experiments related to the preparation and property verification of nitrogen oxides (such as nitrogen dioxide and nitrogen monoxide) are important teaching contents for showing the characteristics of oxidation-reduction reaction and deepening the understanding of students on the properties of elemental compounds. However, such experiments have long presented significant safety and environmental concerns during classroom demonstration. Currently, conventional chemical experiment demonstration devices mostly take over traditional open or semi-open structures. Reactive gases generated during the experiment, particularly nitrogen oxide gases having a strong pungent odor, are generally discharged directly into the classroom environment without being collected and treated. The nitrogen oxides belong to toxic and harmful gases, and can cause obvious stimulation and damage to respiratory systems and mucous membrane tissues of teachers and students after being inhaled in a short time, so that potential health risks exist after long-term exposure. Due to the lack of special treatment equipment for the reaction gas, harmful gas cannot be effectively collected and purified at the generation source, so that the air quality of a classroom is deteriorated, teachers and students are exposed to higher occupational health risks, and the problem is a prominent contradiction restricting the improvement of the teaching safety level of chemical experiments. Aiming at the problems, although the prior experimental device adopts a closed structure or a simple absorption bottle for improvement, the prior experimental device has the defects that firstly, the device is low in integration level and is temporarily built, the comprehensive trapping of the reaction gas is difficult to realize, secondly, the purifying function is single, the purifying efficiency of the conventional filter screen for filtering or simple absorption mode for harmful gases with special dissolving characteristics and complex reaction paths such as nitrogen oxides is limited, the stable and thorough standard emission is difficult to realize, and the potential safety hazard caused by the leakage of the toxic gases can not be fundamentally solved. Disclosure of Invention The invention provides a closed purification type chemical experiment safety demonstration device which solves the potential safety hazard caused by toxic gas leakage. In order to achieve the aim of the invention, the invention adopts the following technical scheme: The utility model provides a seal purification formula chemistry experiment safety presentation device, includes the demonstration table body, the both sides of demonstration table body are provided with the back subassembly, the back subassembly is including setting up the back curb plate in demonstration table body both sides, the end of giving vent to anger of back curb plate is provided with negative pressure suction pump, the rear side of demonstration table body is provided with the glass panel, the inside primary purification mechanism and the second grade purification mechanism of being provided with of demonstration table body, primary purification mechanism includes the spiral pipe, be provided with the liquid medicine nozzle on the spiral pipe, the inlet end of spiral pipe is connected with the end of giving vent to anger of negative pressure suction pump, the end of giving vent to anger of spiral pipe is connected with the second grade purification mechanism, the second grade purification mechanism includes the elasticity rubber tube, the inside sponge filter that is provided with of elasticity rubber tube, the inlet end of elasticity rubber tube is connected with the end of giving vent to anger of spiral pipe. Further, a spiral rib with a hollow structure is arranged in the pipe wall of the elastic rubber pipe, a soaking nozzle is arranged on the inner side of the spiral rib, a fixed end plate is arranged at the air inlet end of the elastic rubber pipe, and a free end plate is arranged at the air outlet end of the elastic rubber pipe. Further, the air outlet end of the elastic rubber tube is provided with a scrubbing assembly, the scrubbing assembly comprises a fixed box arranged on the inner side of the demonstration table body, a blowing and sucking pump is arranged in the fixed box, an air guide hose is arranged on the blowing and sucking pump, the air guide hose penetrates through the upper side of the