CN104696235B - Spiral case centrifugal multiblade environmental protection special fan - Google Patents

Abstract

This technology is dedicated to the source control of complex mixed pollution gases such as oil fume, water vapor, PM2.5; 2. The impeller speed of the fan for environmental protection is 1450 rpm, with 72 blades, and the pollutants flying tangentially out of the surface are thrown to the fan at a speed of 1740 per second. On the volute wall, about 90% of the pollutants are received by the receiver, and about 10% of the pollutants are thrown to the air outlet; 3. Install three concentric rib plates at every 0.618 in the vertical direction of the rotating shaft to increase the strength of the impeller. Reduce vibration and noise, control the flying direction of the oil-water cut surface, and prevent pollutants from escaping under the action of wind; 4. The receiver is made of plant fiber, fixed between the fan volute and the metal screen, and has the same geometric shape as the volute. Using the Archimedes helix transmission wind system, the receiver increases the strength of the volute, reduces vibration, and has a certain sound absorption and noise reduction effect; 5. Installing a tapered receiver at the air outlet is equivalent to adding a muffler at the air outlet.

Description

Volute multi-blade centrifugal fan for environmental protection

1. Technical field

This technology is dedicated to the source control of air pollutants in environmental protection: oil fume, water vapor, PM2.5 complex mixed pollution gas.

2. Background technology

1. Before this technology existed, the volute centrifugal multi-leaf fan and centrifugal fan axial flow fan used were used for suction, air supply, direct discharge or cooling and dehumidification.

2. In the process of inventing kitchen PM2.5 and polluted air purifier design, manufacture, use and maintenance, it was discovered that the volute centrifugal multi-leaf fan, the impeller has centrifugal separation of oil and water, and allows oil and water to aggregate, wrapping dust and PM2.5 particles Function: After oil fume, water vapor, mixed complex gas and various particles enter the fan, it is like entering a small oil-water mist dust removal system. Therefore, I have designed a multi-leaf centrifugal environmental protection special fan with a volute, which can purify (receive) oil fume and water. Air, PM2.5 and other particles mixed with complex substances and other functions, and experimented with it, the effect is very good. Experimental process: A 180W motor is used to drive an ordinary multi-blade fan. When the impeller is 1450 rpm, the particulate matter in the complex mixture of polluted gas (during cooking and frying in the kitchen) such as oil and water PM2.5 can dissolve in the fan. In oil and water, the particles that cannot be dissolved in oil and water are wrapped in oil and water, thrown to the wall of the volute and then bounced back to the impeller, and the process is repeated. The random part is sent into the air by the wind, and the pollution surface is larger and the spread is wider. From dust removal to extended dust release, that's the problem to be solved.

3. In the research, it is found that in order to expand the converging function of pollutants, the contact area between impeller blades and pollutants must be increased. Generally, the number of blades of multi-blade centrifugal fans is 60, and the motor rotates at 1450 revolutions per minute, so it rotates at 24 revolutions per second. That is to say, the number of pollutants thrown by the rapidly rotating impeller is 60 leaves per second, and the cut surface × 24 revolutions/second = 1450 leaf cut surfaces/second. When the ordinary multi-blade centrifugal fan is working, 1450 cut surfaces are produced per second. 90% of the flying pollutants fly to the volute at close range under the action of wind force, and bounce back to the impeller, blade or gather in the volute. Repeatedly, about 10% of the pollutants are directly discharged into the atmosphere. Under the action of the wind force, more than 95% of the pollutants are directly discharged into the atmosphere with the wind as extremely small particles, spreading farther, and the pollution area is larger; this is the pollution generation and diffusion process of dust removal inside the fan and dust generation outside the fan .

4. In order to solve the above problems, a volute multi-blade centrifugal fan for environmental protection was invented.

3. Contents of the invention

1. The blades of the ordinary multi-blade centrifugal fan are 60 pieces, and the blades of the special environmental protection fan are designed to be 72 pieces. 2 pieces are installed every degree of the 360°circle, and the contact area with the pollutants is increased by 20%. The pollutants flying out of the surface are thrown to the wall of the fan volute at a high speed, creating conditions for the subsequent reception of more than 90% of the pollutants.

2. Install a concentric circular rib plate at every 0.618 in the vertical direction of the impeller shaft, a total of three pieces, as shown in Figure 3, D, C, E, B are the ends of the motor direction, A is the end of the air inlet, the purpose ① is to increase The strength of the impeller reduces vibration and noise. ② is to control the flying direction of the oil-water section, that is, to fly directionally to the receiver under the action of centrifugal force, so that the receiver has a stronger ability to receive pollutants, a deeper adsorption depth, and escape under the action of wind (see Figure 3).

3. The receiver is composed of plant fibers and fixed between the iron volute of the fan and the metal screen. The geometric shape of the inner shell of the receiver is the same as that of the volute of the centrifugal multi-leaf fan. When the fan is working, the oil and water PM2. 5. Under the protection of the ribs, the complex mixture of pollution flies towards the volute in the direction of the tangent plane. It is received by the receiver plant fiber fixed on the volute, which prevents the rebound and diffusion of oil and water pollutants (meaning that the straw boat borrows an arrow). After the work is over, the residual temperature evaporates the water, while other substances remain in the Plant fiber is medium. The receiver is composed of plant fibers and plant fibers with an oil-water adsorption ratio of more than 1:1, and has a strong ability to absorb oil fumes, water vapor, PM2.5 and other particulate matter. The plant fiber receiver increases the strength of the volute, reduces vibration, and has certain sound-absorbing and sound-absorbing effects (see accompanying drawing 1, accompanying drawing 2 and accompanying drawing 4).

3. Install a taper oil fume water vapor pollution mixture plant fiber receiver at the air outlet, which is equivalent to adding a silencer at the air outlet (see accompanying drawing 1 and accompanying drawing 2).

4. As long as cooking or industrial production, incineration of oils and fats will produce oil fumes, water vapor and PM2.5 complex mixed pollutants, it is suitable to install and use this fan. The combined use of this fan with kitchen PM2.5 and polluted gas purifiers will have a better effect it is good.

4. Description of drawings

Figure 1: Description of the composition of the volute multi-blade centrifugal fan for environmental protection (side-changing receiver type)

1. Fan impeller

2. Three pieces of rib plate for impeller and blade

3. Volute lining (receiver screen fixed net)

4. Receivers for complex mixtures such as oil fume, water, gas, dust particles, PM2.5, etc., composed of plant fibers with an oil-water adsorption ratio of more than 1:1

5. The outer wall of the fan volute

6. Fan support and air inlet and outlet boxes

7. The air outlet is connected to the exhaust pipe

8. Air outlet receiver (shock-absorbing muffler)

9. Oil collection observation hole (Once the hole is found to have grease accumulation, it means that the receiver is saturated with oil, and a new receiver must be replaced)

Figure 2: Explanation of volute multi-blade centrifugal fan for environmental protection (top-change receiver)

1. Impeller

2. Ribs (three pieces)

3. Receiver fixed screen

4. Plant fiber oil smoke water vapor PM2.5 and mixed complex receiver

5. The outer wall of the volute

6. Fan inlet, exhaust and fan fixed support box

7. Air outlet flange joint

8. Tapered plant fiber pollutant receiver (air outlet muffler)

9. Oil collection observation hole

10. The connecting flange between the air outlet and the box, and the top of the receiver

Figure 3: The positions of the three ribs D, C, E on the impeller

1. Rib D: AD＝0.618AC

2. Rib C: AC＝0.618AB

3. Rib E: CE＝0.618CB

4. Motor

5. Fan impeller

Note: AC＝0.618AB

AD＝0.618AC＝0.618*0.618AB

CE＝0.618CB＝0.618(AB-AC)＝0.618(AB-0.618AB)＝0.618*0.382AB

Figure 4: Fan volute and receiver assembly

1. Multi-leaf centrifugal fan volute for environmental protection

2. Multi-leaf centrifugal environmental protection special fan receiver fixed screen

3. The multi-leaf centrifugal environmental protection special fan in the pot shell, oil fume, water vapor, PM2.5 complex mixed pollutant receiver (composed of plant fibers with an oil-water adsorption ratio of 1:1 or more).

Claims (3)

1. 360 ° of impeller spiral case centrifugal multiblade environmental protection special fans for amounting to 72 leaves of circumference, based on 1450 revs/min of motors, often Second generating 1740 sections dishes out oil mixing with water complexity object in receiver, improves impeller blade to greatest extent and pollutant is collected Area, to improve the acceptance rate of pollutant, the complicated pollutant receiver of oil smoke vapor PM2.5 mixing is made of plant fiber, It is fixed between wind turbine iron spiral case and sieve, pollutant receiving plane geometry is consistent with spiral case geometry in receiver, adopts With spiral of Archimedes collection supply air system, the grease PM2.5 collected on blade during blower fan work pollutes complex mixture in muscle Plant fiber receiver is thrown to the grease complex mixture orientation of 1740 sections per second convergence under the escorting of plate, the receiver The diffusion of pollutant is prevented, rebounds, while reduces wheel rotation resistance；After work, residual temperature allows vapor to evaporate, oil Fat, PM2.5 are stayed in plant fiber, and the receiver that plant fiber is done adds the intensity of spiral case, reduce the vibrations of spiral case, have Certain sound-absorbing, erasure effect.

2. 360 ° of impeller spiral case centrifugal multiblade environmental protection special fans for amounting to 72 leaves of circumference according to claim 1, leaf In wheel shaft vertical direction, installing web plate at every line segment 0.618, totally three pieces, B is impeller motor end terminal, and A is impeller air inlet end Point, D, C, E are installation site of three pieces of gussets on impeller, wherein

AC=0.618AB

AD=0.618AC

CE=0.618CB

Gusset strengthens impeller intensity and reduces vibrations, reduces noise, and gusset controls blade face pollutant tangential under the action of the centrifugal force Fly out direction, and orientation flies to receiver, makes receiver receiving ability stronger, and it is deeper that pollutant enters plant fiber, prevents from running away.

3. 360 ° of impeller spiral case centrifugal multiblade environmental protection special fans for amounting to 72 leaves of circumference according to claim 1, Air outlet installation taper oil smoke aqueous vapor pollution complex mixture plant fiber receiver, is equivalent to and is mounted with noise reduction in air outlet Device.