Intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet and manufacturing method thereof

Abstract

The present invention discloses a smart energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet and a manufacturing method thereof. The exhaust cabinet comprises a cabinet body, a first chemical filter module, a fan frame, and a second chemical filter module arranged in sequence on the top of the cabinet body; a fan is arranged in the fan frame to cause the air in the cabinet body to pass through the first chemical filter module and be discharged from the second chemical filter module; the first chemical filter module is provided with a plurality of spaced main mesh layers, the front end of the second chemical filter module is provided with a reaction area of ​​non-thermal plasma for oxidizing organic pollutants, and the second chemical filter module is provided with a secondary mesh layer corresponding to the non-thermal plasma; the main mesh layer and the secondary mesh layer are porous structures for adhering reactants. The present invention realizes good indoor circulation performance for the emission purification of special gases, and has intelligent energy-saving and environmental protection effects.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical laboratory equipment, and in particular relates to an intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet and a manufacturing method thereof. Background Art

[0002] In the pharmaceutical engineering or laboratory of a biopharmaceutical factory, due to factors such as drug grinding and drug reaction, a large amount of waste gas containing dust and microorganisms is easily generated, which is easy to pollute the environment when discharged into the air, so the air needs to be purified. The pollutants in the plant or laboratory of a biopharmaceutical factory are mainly alkaline gases, acidic gases, and organic pollutants.

[0003] In the prior art, most of the air purification devices used in biomedical factories or laboratories are not much different from general air purifiers, are not targeted, and cannot treat special pollutants; Patent No. 201810876588.5 is a biomedical air purification device, which effectively purifies the air by setting a filter area and a fan area and discharges it through a pipe. Due to the limitations of the space layout caused by the setting of the pipe, it is impossible to form an effective circulation indoors, and the indoor air cannot be kept warm; the device can perform drying and sterilization treatments, but it cannot be adaptively opened and closed according to the need to purify the gas, which increases energy consumption.

[0004] Conventional sodium bicarbonate is very effective in neutralizing acidic substances, but its powdery consistency makes it difficult to use in air filters, which require a large surface area for contact, and it is difficult for sodium bicarbonate to achieve adequate filtering performance; conventional activated carbon is added with rare earth metals and organic metal catalysts for acid removal, which not only reduces the effective filtration area of ​​activated carbon, but also causes inadequate filtration and produces toxic residues; conventional ammonia removal methods use activated carbon impregnated with sulfuric acid or ZnCl2 to neutralize ammonia, because activated carbon has a porous mesh structure, after being impregnated with a certain chemical substance, other chemicals cannot be added, which limits the ability to filter gas. Summary of the invention

[0005] The purpose of the present invention is to solve the above technical problems and provide an intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet and its manufacturing method, so as to achieve good indoor circulation performance for the emission and purification of special gases, and have intelligent energy-saving and environmental protection effects. In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0006] An intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet comprises a cabinet body, a first chemical filter module, a fan frame, and a second chemical filter module arranged in sequence on the top of the cabinet body;

[0007] The fan frame is provided with a fan for causing the air in the cabinet to pass through the first chemical filter module and be discharged from the second chemical filter module;

[0008] The first chemical filtration module is provided with a plurality of spaced main mesh layers, the front end of the second chemical filtration module is provided with a reaction area of ​​non-thermal plasma for oxidizing organic pollutants, and the second chemical filtration module is provided with a secondary mesh layer corresponding to the non-thermal plasma;

[0009] The main mesh layer and the secondary mesh layer are both porous structures that adhere to reactants or catalysts. The reactants in the main mesh layer react with alkaline gases and acidic gases, and the catalysts in the secondary mesh layer react with organic pollutants.

[0010] The air outlet of the cabinet is equipped with a gas sensor for detecting the type and concentration of gas, the fan is connected to a wind speed sensor for detecting its rotation speed, the gas sensor and the wind speed sensor are connected to a central control unit; the motor driving the fan is connected to a PCB board connected to the central control unit.

[0011] Specifically, the main carrying net layer is made of porous foam or glass fiber.

[0012] Specifically, the main mesh layer includes a first mesh layer, and citric acid is carried and adhered to the first mesh layer.

[0013] Specifically, the main mesh layer also includes a second mesh layer, and the second mesh layer is adhered with one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, calcium carbonate, calcium bicarbonate, and calcium hydroxide.

[0014] Specifically, the carrying sub-net layer is made of one or more of porous foam, ceramic particle net, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt.

[0015] Specifically, the reaction area of ​​the non-thermal plasma generates O3 unstable gas; the carrying sub-grid layer includes a third mesh layer, and the third mesh layer is carried and adhered with a first catalyst containing MnO2, CuO, platinum or platinum oxide.

[0016] Specifically, the secondary mesh layer further includes a fourth mesh layer disposed behind the third mesh layer, and the fourth mesh layer is provided with a second catalyst adhered thereto for catalyzing the third mesh layer to filter gas.

[0017] Specifically, the cabinet body includes a storage board, a front cabinet door and a back panel arranged on the front and rear sides of the storage board, and side panels arranged on the left and right sides of the storage board; the front cabinet door is provided with a plurality of hinged folding transparent sheets, and an air inlet is opened on the folding transparent sheet located at the bottom layer.

[0018] Specifically, a touch shell is provided on the side of the fan frame and the supporting frame, a touch screen is installed in the touch shell, a central control unit is provided in the touch shell, the touch screen is control-connected to the central control unit, the gas sensor sends the detection data to the central control unit, and displays the type and concentration information of the gas in the cabinet on the touch screen; the wind speed sensor sends the detection data to the central control unit, and displays the wind speed information in the fan frame on the touch screen.

[0019] The manufacturing method of the intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet comprises the following steps:

[0020] 1) using porous foam or glass fiber to form the first mesh layer and the second mesh layer, and using any one of porous foam, ceramic particle mesh, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt to form the third mesh layer and the fourth mesh layer;

[0021] 2) Glue spraying: evenly spraying thermal glue on the first to fourth mesh layers;

[0022] 3) Dry naturally;

[0023] 4) Sprinkling powder: sprinkle acidic reactants on the first mesh layer to purify alkaline gases in the air; sprinkle alkaline reactants on the second mesh layer to purify acidic gases in the air; sprinkle catalysts on the third and fourth mesh layers to purify organic pollutants in the air;

[0024] 5) The first mesh layer and the second mesh layer are placed in an aluminum alloy frame to form a first chemical filtration module; the third mesh layer and the fourth mesh layer are placed in an aluminum alloy frame to form a second chemical filtration module;

[0025] 6) A non-thermal plasma reaction area is set at the installation front end of the second chemical filtration module, and unstable active gas is generated in the reaction area through two electrodes;

[0026] 7) A fan is installed between the first chemical filtration module and the second chemical filtration module to discharge gas from the second chemical filtration module;

[0027] 8) The corners of each chemical filtration module are sealed with EPDM and fixed to the cabinet.

[0028] Compared with the prior art, the beneficial effects of the intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet and its manufacturing method of the present invention are mainly reflected in:

[0029] Different mesh layers are set to carry reactants or catalysts to purify specific target chemicals, which is suitable for different laboratory scenarios; alkaline reactants with powdery consistency or crystalline acidic reactants are bonded to the mesh layer with a porous structure to obtain a larger surface area contact, achieve full air purification, and effectively remove ammonia and acid gases; activated carbon is loaded with catalysts to effectively convert O3 and by-products of organic pollutants generated in the non-thermal plasma reaction area, thereby improving the ability to purify the air; there is no pipeline installation in the cabinet 1, which effectively ensures the indoor air circulation, has green energy-saving performance, and the filtration and exhaust are safe and reliable; the PCB board adopts a sensorless vector drive system to control the motor, which has the characteristics of noise reduction and long service life; the gas sensor and wind speed sensor in the cabinet are connected to the central control unit, and human-computer interaction is realized through the touch screen to accurately control the gas emission demand in the cabinet, so as to achieve intelligent control and air purification. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional structure;

[0032] Figure 3 This is a schematic diagram of the circuit connection of this embodiment;

[0033] The numbers in the figure represent:

[0034] 1 cabinet body, 11 storage board, 12 front cabinet door, 13 back panel, 14 side panel, 15 folding transparent sheet, 16 air inlet, 2 support frame, 3 first chemical filtration module, 31 main mesh layer, 32 load-bearing frame, 33 slide slot, 4 fan frame, 41 through hole, 5 second chemical filtration module, 51 secondary mesh layer, 6 fan, 61 motor, 7 support rod, 71 universal wheel, 8 touch housing, 81 touch screen, 9 air outlet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0036] Embodiment 1:

[0037] Reference Figure 1-3As shown, the present embodiment is an intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet, comprising a cabinet body 1, a support frame 2 covering the top opening of the cabinet body 1, a first chemical filtration module 3 arranged on the top of the support frame 2, a fan frame 4 arranged on the top of the first chemical filtration module 3, and a second chemical filtration module 5 arranged on the top of the fan frame 4; a fan 6 is arranged in the fan frame 4 to cause air to pass through the first chemical filtration module 3 and be discharged from the second chemical filtration module 5 in sequence.

[0038] The first chemical filtration module 3 is provided with a plurality of spaced main mesh layers 31; the main mesh layer is a porous structure, specifically made of porous foam or glass fiber, and the porous foam is made of one or a mixture of polyurethane, polyethylene, silicone resin, rubber, and polyvinyl chloride.

[0039] In this embodiment, a main mesh layer 31 is carried, which includes a first mesh layer, on which citric acid is adhered, which effectively removes alkaline gases in the cabinet; the porous foam is made of a material with tolerance to target chemicals, such as ammonia, and the reactant is adhered to the porous foam, so that the reactant contacts the air of the porous foam, and the reactant effectively reacts with the target chemical in the air; citric acid is attached to the first mesh layer by spraying an adhesive, and since citric acid crystals are small particles, there is no need to put the porous foam into a citric acid solution, and a direct spraying method is used, which consumes less and does not require drying, allowing a large amount of citric acid to be deposited on the porous foam.

[0040] The main mesh layer 31 also includes a second mesh layer. The second mesh layer is selected according to the properties of the air to be purified. It can be arranged before or after the first mesh layer. The second mesh layer is attached with one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, calcium carbonate, calcium bicarbonate, and calcium hydroxide to effectively remove the acidic gas in the cabinet. The second mesh layer fixes one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, calcium carbonate, calcium bicarbonate, and calcium hydroxide by an adhesive. The modified porous foam or glass fiber has high acid and alkali resistance, making it easy for air to pass through, thereby achieving high efficiency in neutralizing acidic or alkaline gases.

[0041] The front end of the second chemical filtration module generates a reaction area of ​​non-thermal plasma for oxidizing organic pollutants in the cabinet. The non-thermal plasma generates O·, O3, and OH· unstable gases through discharge between two electrodes. Specifically, 10000-30000V, 50-2000HZ, and a pulse time of 20ns are used to generate non-thermal plasma.

[0042] The second chemical filtration module 5 is provided with a plurality of spaced-apart carrying sub-net layers 51; the carrying sub-net layer 51 is a porous structure, specifically made of one or more of porous foam, ceramic particle net, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt;

[0043] In this embodiment, a secondary mesh layer 51 is provided, specifically including a third mesh layer, on which a first catalyst containing MnO2, CuO, platinum or platinum oxide is attached, and the first catalyst reacts with O3, and organic pollutants and organic pollutant byproducts are converted again to generate small molecule products including CO, CO2 and H2O;

[0044] The secondary mesh layer 51 also includes a fourth mesh layer arranged behind the third mesh layer. The fourth mesh layer is attached with a second catalyst for catalyzing the third mesh layer to filter gas. CuO is used as the second catalyst to convert CO into CO2 for emission.

[0045] According to the needs of purifying the environment, the secondary mesh layer also includes a fifth mesh layer. The fifth mesh layer is made of polytetrafluoroethylene material, and its gaps can filter 0.12-0.3μm particles to achieve pure air filtration.

[0046] The cabinet 1 includes a storage board 11, a front cabinet door 12 and a back panel 13 arranged at the front and rear sides of the storage board 11, and side panels 14 arranged at the left and right sides of the storage board; the front cabinet door 12 is provided with a plurality of hinge-connected folding transparent sheets 15; the folding transparent sheet 15 at the bottom layer is provided with an air inlet 16. Medicines or reaction containers are stored on the storage board 11, and the polluted gas generated rises and is discharged by the fan 6.

[0047] The first chemical filtration module 3 comprises a supporting frame 32, and a plurality of spaced and stacked main mesh layers 31 are arranged in the supporting frame 32. The supporting frame 32 is a frame made of aluminum alloy material.

[0048] The opposite sides of the support frame 2 and the fan frame 4 are provided with slide grooves 33 corresponding to the bearing frame 32. The bearing frame 32 can be pulled out or pushed in from the side between the support frame and the fan frame, so as to facilitate the replacement or maintenance of the main grid layer 31.

[0049] Support rods 7 are respectively provided at the four corners of the bottom of the cabinet body 1 , and universal wheels 71 are installed at the bottom of the support rods 7 .

[0050] A touch housing 8 is provided on the side of the fan frame 4 and the support frame 2, and a touch screen 81 is installed in the touch housing 8. A central control unit (not shown in the figure) is provided in the touch housing 8, and the touch screen 81 is control-connected to the central control unit.

[0051] The air outlet 9 of the cabinet 1 is equipped with a gas sensor 9 for detecting the type and concentration of gas. The gas sensor 9 sends the detection data to the central control unit and displays the type and concentration information of gas in the cabinet 1 on the touch screen 81. The air outlet 9 is the exhaust end face of the second chemical filtration module 5.

[0052] The fan frame 4 separates the first chemical filtration module 3 and the second chemical filtration module 5 into two spaces. The fan frame 4 is provided with a through hole 41. A fan 6 is provided in the through hole 41. The fan 6 is connected to a motor 61 for driving the fan 6 to rotate. The fan 6 is connected to a wind speed sensor (not marked in the figure) for detecting its rotation speed. The wind speed sensor sends the detection data to the central control unit and displays the wind speed information in the fan frame 4 on the touch screen 81.

[0053] The motor 61 is connected to a PCB board connected to the circuit, the PCB board is connected to a central control unit, and the PCB board is provided with a central energy storage unit, a rectifier unit, an inverter unit, and a filter unit that cooperate with each other.

[0054] The PCB board uses a sensorless vector drive system to control the motor, effectively achieving energy-saving applications. According to the feedback information from the wind speed sensor, the central control unit controls the fan 6 to maintain a constant exhaust wind speed, with noise as low as 55dB, far below the national standard of 65Db; the motor service life is extended by more than 50,000 hours, far exceeding the national standard of 12,000 hours.

[0055] Embodiment 2:

[0056] The manufacturing method of the intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet comprises the following steps:

[0057] 1) using porous foam or glass fiber to form the first mesh layer and the second mesh layer, and using any one of porous foam, ceramic particle mesh, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt to form the third mesh layer and the fourth mesh layer;

[0058] 2) Glue spraying: evenly spraying thermal glue on the first to fourth mesh layers;

[0059] 3) Dry naturally;

[0060] 4) Sprinkling powder: sprinkle acidic reactants on the first mesh layer to purify alkaline gases in the air; sprinkle alkaline reactants on the second mesh layer to purify acidic gases in the air; sprinkle catalysts on the third and fourth mesh layers to purify organic pollutants in the air;

[0061] 5) The first mesh layer and the second mesh layer are placed in an aluminum alloy frame to form a first chemical filtration module; the third mesh layer and the fourth mesh layer are placed in an aluminum alloy frame to form a second chemical filtration module;

[0062] 6) A non-thermal plasma reaction area is set at the installation front end of the second chemical filtration module, and unstable active gas is generated in the reaction area through two electrodes;

[0063] 7) A fan is installed between the first chemical filtration module and the second chemical filtration module to discharge gas from the second chemical filtration module;

[0064] 8) The corners of each chemical filtration module are sealed with EPDM and fixed to the cabinet.

[0065] When applying the above embodiment, different mesh layers are set to carry reactants or catalysts to purify specific target chemicals, which is suitable for different laboratory scenarios; the alkaline reactant with powdery consistency or the acidic reactant with crystals is bonded to the mesh layer with a porous structure to obtain a larger surface area contact, thereby achieving full air purification and effectively removing ammonia and acidic gases; the activated carbon is loaded with a catalyst to effectively convert O3 and byproducts of organic pollutants generated in the non-thermal plasma reaction area, thereby improving the ability to purify the air; there is no pipeline installation in the cabinet 1, which effectively ensures the indoor air circulation, has green energy-saving performance, and is safe and reliable in filtering and exhausting; the PCB board adopts a sensorless vector drive system to control the motor, which has the characteristics of noise reduction and long service life; the gas sensor 9 and the wind speed sensor in the cabinet 1 are connected to the central control unit, and human-computer interaction is realized through the touch screen 81, and the gas emission demand in the cabinet 1 is accurately controlled to achieve intelligent control and air purification.

[0066] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet, characterized by: It includes a cabinet, a first chemical filtration module, a fan frame, and a second chemical filtration module which are sequentially arranged on the top of the cabinet; The fan frame is provided with a fan for causing the air in the cabinet to pass through the first chemical filter module and be discharged from the second chemical filter module; The first chemical filtration module is provided with a plurality of spaced main mesh layers, the front end of the second chemical filtration module is provided with a reaction area of ​​non-thermal plasma for oxidizing organic pollutants, and the second chemical filtration module is provided with a secondary mesh layer corresponding to the non-thermal plasma; The main mesh layer and the secondary mesh layer are both porous structures that adhere to reactants or catalysts. The reactants in the main mesh layer react with alkaline gases and acidic gases, and the catalysts in the secondary mesh layer react with organic pollutants. The air outlet of the cabinet is equipped with a gas sensor for detecting the type and concentration of gas, the fan is connected to a wind speed sensor for detecting its rotation speed, and the gas sensor and the wind speed sensor are connected to a central control unit; the motor driving the fan is connected to a PCB board connected to the central control unit; The main carrying net layer is made of porous foam or glass fiber; The main mesh layer includes a first mesh layer, and citric acid is adhered to the first mesh layer; The main mesh layer also includes a second mesh layer, and the second mesh layer is adhered with one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, calcium carbonate, calcium bicarbonate, and calcium hydroxide; The reaction area of ​​the non-thermal plasma generates O3 unstable gas; the carrying sub-grid layer includes a third grid layer, and the third grid layer carries and adheres a first catalyst containing MnO2, CuO, platinum or platinum oxide; The secondary mesh layer also includes a fourth mesh layer arranged behind the third mesh layer, and the fourth mesh layer is supported and adhered with a second catalyst for catalyzing the third mesh layer to filter gas.

2. The intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet according to claim 1 is characterized by: The carrying sub-net layer is made of one or more of porous foam, ceramic particle net, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt.

3. The intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet according to claim 1 is characterized by: The cabinet body includes a storage board, a front cabinet door and a back panel arranged on the front and rear sides of the storage board, and side panels arranged on the left and right sides of the storage board; the front cabinet door is provided with a plurality of hinged folding transparent sheets, and an air inlet is opened on the folding transparent sheet located at the bottom layer.

4. The intelligent energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet according to claim 1 is characterized in that: A touch shell is provided on the side of the fan frame and the supporting frame, a touch screen is installed in the touch shell, a central control unit is provided in the touch shell, the touch screen is controlled and connected to the central control unit, the gas sensor sends the detection data to the central control unit, and displays the type and concentration information of the gas in the cabinet on the touch screen; the wind speed sensor sends the detection data to the central control unit, and displays the wind speed information in the fan frame on the touch screen.

5. A method for manufacturing a smart energy-saving and noise-reducing ductless negative pressure clean air exhaust cabinet, characterized in that: The following steps are involved: 1) using porous foam or glass fiber to form the first mesh layer and the second mesh layer, and using any one of porous foam, ceramic particle mesh, ceramic Raschig ring, alumina, activated carbon, carbon cloth, and carbon felt to form the third mesh layer and the fourth mesh layer; 2) Glue spraying: evenly spraying thermal glue on the first to fourth mesh layers; 3) Dry naturally; 4) Sprinkling powder: sprinkle acidic reactants on the first mesh layer to purify alkaline gases in the air; sprinkle alkaline reactants on the second mesh layer to purify acidic gases in the air; sprinkle catalysts on the third and fourth mesh layers to purify organic pollutants in the air; 5) The first mesh layer and the second mesh layer are placed in an aluminum alloy frame to form a first chemical filtration module; the third mesh layer and the fourth mesh layer are placed in an aluminum alloy frame to form a second chemical filtration module; 6) A non-thermal plasma reaction area is set at the installation front end of the second chemical filtration module, and unstable active gas is generated in the reaction area through two electrodes; 7) A fan is installed between the first chemical filtration module and the second chemical filtration module to discharge gas from the second chemical filtration module; 8) The corners of each chemical filtration module are sealed with EPDM and fixed to the cabinet.

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