DE102006020312A1 - Lamellae manufacturing and assembly for radial ventilators of any dimension, has larger section in which internal friction is available caused by turbulence which reduces friction resistance - Google Patents

Abstract

The lamellae has a larger section in which an inner friction is available caused by the turbulence which reduces the friction resistance. The fiber reinforced plastics during its movement experience an impulse by the flow separation edge and by the turbulences and are incites by rollers and trundles. An independent claim is included for use of lamellation technique for increasing the flow rate or wear reduction in ventilation system plant construction and to decrease of the deformation of solid state in the ventilation system and the fine chip formation of dust.

Description

State of the art:

The screw housing and the impeller are made of smooth, commercially available sheets. (Anl.1) During operation, solids (Fk) (chips, cereal grains, granules, and others) slide over surfaces, sliding surfaces on sheet 5 1 are indicated by dashed lines. The invention relates to this.

Of the Share of Fk. in the air-fuel mixture is usually less than 20%.

Flow in the housing:

The sucked Fk. (Entrance to the fan) bounce at 11-20 m / s on the rotating impeller (1450-2000 rpm) and are deflected by 90 °. Centrifugal forces begin to act on air and Fk by removing it from the center. Thereby elevated also the pressure of the Fk. on the wings. This effect generates a high friction intensity. The Fk. leave the impeller and bounce on the housing wall at a speed of 110-200 km / h. The speed with which the Fk. move is dependent on their shape and their mass. In the worst case, the Fk. about the entire circumferential length the grinder is ground or sanded.

Example: The glide path of the Fk. in a fan with a diameter of 1.20 m is 4.10 m. The sliding or rubbing speed despite the action of Centrifugal force moves between 180-210 km / h.

• – 33 jährige Berufserfahrung (Service und Reparaturen bei Kunden)
• – Recherchen in der TU Darmstadt (Abt. Strömungslehre u. Aerodynamik)
• – zur Begriffsbestimmung und als Formulierungshilfe wurde die freie Enzyklopädie Wikipedia in Anspruch genommen.
• – der Verständnisgrad zur Ventilatorentechnik ist ein Meistertitel im Schlosserhandwerk, sowie persönliche, körperliche Erfahrungen im Strömungsfliegen.

Bases of the invention are

• - 33 years of professional experience (customer service and repairs)
• - Research at TU Darmstadt (Dept. of Fluid Dynamics and Aerodynamics)
• - The free encyclopedia Wikipedia was used for the definition of terms and as a formulation aid.
• - The degree of understanding of fan technology is a master's degree in locksmithing, as well as personal, physical experience in the flow flying.

All Rating information (adjectives, e.g., large, small) can be obtained through measurements and high-speed recordings be proven and submitted later.

Problems and Disadvantages of the prior art

• 1. The sliding surfaces-that's what the Invention, are consumed by friction (abrasive wear).
• 2. The Fk. are deformed by rubbing, grinding, because no "intermediate" (see Tribology) is available.
• 3. The resulting fine dust dust pollutes the environment or it means a high cost through filter systems and its maintenance.
• 4. The frictional drag slows down the relative movement of the Fk .. This is at the expense of the capacity.
• 5. Overcome the frictional resistance is additional Energy required.

What is possible?

Around to alleviate or completely eliminate these disadvantages would it be an advantage, the FK. not at all, if at all, as little as possible with the opposite body (Fan casing) in touch to come. And if the contact of Fk. not completely with the fan housing can be prevented, then a rolling or spinning or wallowing, instead of sliding contact, which is known to have a lower frictional resistance exhibit.

Lotus leaf effect and the scale structure of the sharkskin show us in bionics the first approaches, the positive boundary layer effects entail. So it was after similar Structures for the surfaces to look in the fan.

The solution:

I I found out that the - principle of Lamellation - the Converting the sliding friction in rolling friction causes. It has also been found that a partial> internal friction <(air to air) takes place, which reduces the frictional resistance.

Lamellation: A multitude of juxtaposed lamellae arranged so that each lamella forms a stall edge. ( 2.3 u. 3.3 This turbulence creates turbulence in the laminar flow. Turbulence occurs when the fluid (air) is forced to leave the boundary layer adhesion of the lamella.

• 1. In dem größeren Abschnitt zwischen den einzelnen Lamellen, hervorgerufen durch die Turbulenzen, ist eine >innere Reibung< (Luft gleitet auf Luft) vorhanden, welche den Reibungswiderstand verringert. Die Hoovercraft-Technik ist ein anschauliches Beispiel dafür.
• 2. Durch die Strömungsabrisskante und durch die Turbulenzen erfahren die Fk. in ihrer Bewegung einen Impuls (punktuelle Abbremsung) und werden dadurch zum Rollen, Trudeln animiert. Ein Flugzeug, das einen Strömungsabriss erfährt beginnt zu trudeln.

As a result, two major changes occur in the flow sequence:

• 1. In the larger section between the individual lamellae, caused by the turbulence, there is an> internal friction <(air slides on air), which reduces frictional resistance. The Hoovercraft technique is an illustrative example.
• 2. Due to the stall edge and the turbulence, the Fk. in her movement an impulse (punctual deceleration) and are thereby animated to roll, spin. An airplane that experiences a stall begins to spin.

Remarks:

The determination of the flow resistance of the - internal friction - after the stall edge is expensive. It is defacto "only to be determined by experiments "and" to provide a computational proof of it is, if at all possible - with great effort. "

• 1. Durch die Umwandlung der Gleitreibung in Roll- od. Wälzreibung der Fk. wird der abrasive Verschleiß drastisch reduziert.
• 2. Auf Grund dessen werden auch die Fk. nicht deformiert und zerkleinert. (Wichtig für die Spanwiederverwertung)
• 3. Daraus folgt, dass die Umweltbelastung durch Feinspan-Staub geringer ist und
• 4. der Kostenaufwand für Filteranlagen und dessen Wartung sich reduziert.
• 5. Durch die Entstehung der Luft auf Luftreibung (geringerer Widerstand) wird Energie frei für mehr Leistung oder
• 6. diese Energie kann eingespart werden.

The principle of lamellation almost eliminates the problems listed in the prior art.

• 1. By the conversion of the sliding friction in rolling or rolling friction of Fk. The abrasive wear is drastically reduced.
• 2. Because of this, the Fk. not deformed and crushed. (Important for chip recycling)
• 3. It follows that the environmental impact of fine-particle dust is lower and
• 4. the cost of filter systems and its maintenance is reduced.
• 5. Due to the formation of air on air friction (lower resistance), energy is released for more power or
• 6. This energy can be saved.

The Lamellation in a trial fan showed a doubling the delivery rate. This proves that the energy needed to overcome the frictional resistance needed was, in promotion has been converted.

description

The description of the siping refers to a centrifugal fan of medium diameter of 1200 for the transport of sawdust. The lamellar material consists of wear-resistant sheet metal (Hardox sheet 500).

The Dimension of the lamella is: width = 125; Thickness = 3; Length = fan width (Inside) - 2

The lamella is rounded according to the radius curve. In 2.1 Sheet 6 shown.

2.2 shows the overlap (about 5) to form the stall edge.

2.3 indicates attachment by countersunk screw M 8 × 20 (wear-resistant).

2.4 indicates the welded connection of a pair of lamellae.

2.5 represents a rubber liner for additional sound insulation.

2.6 shows the housing shell according to the prior art.

2.7 indicates the direction of flow after which the overlap is aligned.

The blades of the impeller are equipped with fins, as in 3 Sheet 7 shown equipped.

The Length of Slat is the blade configuration customized.

The Thickness of the lamella is Second

The Width of the lamella (the first one is 30 mm wide) increases by 2 mm, the further you go to the edge of the impeller is positioned. (30 → 32 → 34 → 36 ...)

3.1 shows a blade according to the prior art.

3.2 shows the overlap (about 3) to form the stall edge.

3.3 shows that each lamella is welded onto the existing blade.

3.4 indicates the direction of rotation of the impeller, which determines the side for welding the lamellae.

Application spectrum of this Technology:

• - Immediately in the manufacture of the centrifugal fan
• - At already severely worn centrifugal fans as a "repair kit".
• - The slats of the 2 are interchangeable with renewed signs of wear.

Advantages and benefits:

For the user of centrifugal fans

• 1. The centrifugal fan gets an unlimited Lifespan. All you need to do is replace the slats. Savings of new investments.
• 2. The delivery rate doubles up. The purchase of a larger fan is eliminated.
• 3. considerable Energy cost savings or smaller drive motors.
• 4. chips are for the processing is not so deformed.
• 5. Reduce the maintenance work (time costs) on filter systems itself, since less Feinspan dust arises.

For the manufacturer:

• 1. A prestige win
• 2. Competitiveness
• 3. Shows environmental awareness
• 4. Innovation ability

For the environment

at the separation of Fk. by cyclone separator or the reaction (manual or by machine), the Feinspan dust pollution of the environment is reduced.

Claims (4)

The manufacture and installation of fins for centrifugal fans of any magnitude. The use of slats as repair elements in centrifugal fans of any size. The use of laminating technology to increase the delivery rate or the wear reduction in ventilation engineering. The use of laminating technology to reduce the deformation of solid in HVAC plant engineering and fine particle dust development.