Duct Ventilators Centrifugal Blowers

In automobiles, a mechanical fan provides engine cooling and prevents the engine from overheating by blowing or sucking air through a coolant-filled radiator. It can be driven with a belt and pulley off the engine’s crankshaft or an electric fan switched on/off by a thermostatic switch.

Axial flow fans have blades that force air to move along the shaft about which the blades rotate. Axial fans blow air across the axis of the fan, linearly, hence their name. This type of fan is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in wind tunnels.

Some examples of axial fans are:

Table fan – Basic elements of a typical table fan include the fan blade, base, armature and lead wires, motor, blade guard, motor housing, oscillator gearbox, and oscillator shaft. The oscillator is a mechanism that motions the fan from side to side. The axle comes out on both ends of the motor, one end of the axle is attached to the blade and the other is attached to the oscillator gearbox. The motor case joins to the gearbox to contain the rotor and stator. The oscillator shaft combines to the weighted base and the gearbox. A motor housing covers the oscillator mechanism. The blade guard joins to the motor case for safety.

Electro-mechanical fans, among collectors, are rated according to their condition, size, age, and number of blades. Four-blade designs are the most common. Five-blade or six-blade designs are rare. The materials from which the components are made, such as brass, are important factors in fan desirability.

Ceiling fan with light.Ceiling fan – A fan suspended from the ceiling of a room is a ceiling fan.

A variable pitch blade in axial fan blower is used where precise control of static pressure within supply ducts is required. The fan wheel will spin at a constant RPM . The blades follow the control pitch hub. As the hub moves toward the rotor the blades increase their angle of attack and an increase in flow results.

In centrifugal fan, as opposed to axial flow fan, the air is moving perpendicularly to the fan shaft. Often called a “squirrel cage” (due to its similarity in appearance to exercise wheels for pet rodents), the centrifugal fan has a moving component (called an impeller) that consists of a central shaft about which a set of blades, or ribs, are positioned. Centrifugal fans blow air at right angles to the intake of the fan, and spin the air outwards to the outlet (by deflection and centrifugal force). The impeller rotates, causing air to enter the fan near the shaft and move perpendicularly from the shaft to the opening in the scroll-shaped fan casing. A centrifugal fan produces more pressure for a given air volume, and is used where this is desirable such as in leaf blowers, hair driers, air mattress inflators, inflatable structures, and various industrial purposes. They are typically noisier than comparable axial fans.

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Simple Methods To Improve Your Negotiation Skills

GET INFORMATION

Get information about what you want to negotiate on. Don’t go into a negotiation without a clue about what to expect in terms of numbers, price or quantity. Ask questions, check websites, do research, do what you need to do to get the information you need. This helps you determine your �target price’ (the price, number or quantity you are hoping to get out of the negotiation) and walk-away terms before you attempt a negotiation; and thus elevates your level � even if only slightly � on the �negotiation field’.

KNOW YOUR PRIORITIES

This is another factor that influences the determination of your �target price’ and walk-away terms. You need to know your priorities in negotiations � determine what is most important and what you are either willing to compromise or willing not to compromise to �close the deal’; this is very important. It is also important that your priorities remain a well-kept secret known only to you, because the moment the other party gets a clue about what’s more important to you in the negotiation process either by your words or actions, it will be used as leverage against you.

DON’T MAKE THE FIRST OFFER

Let the other party make the first offer, else you risk making an offer worse than what the other would have offered. For example, imagine you are negotiating over the price of a car. You make the first offer at 1.4 million naira from an initial price of 1.6 million naira. But the seller of the car was
going to offer 1.3million naira if he/she had made the first offer.

So, please don’t make the first offer in negotiations. Don’t give away your ground like that. Wait for the other person. If the other person insists you go first, from the information you must have gathered before the negotiation process, make an offer 5-10 percent lower than the least price, number or quantity of the information you gathered beforehand. It is better your first offer is outrageously low than outrageously high.

SILENCE IS GOLDEN

Don’t be too quick to respond to an offer. Give it time. This helps you not to appear desperate and helps you appear flexible.

Sometimes merely remaining silent is all the pressure you need to force the hand of the other party in the negotiation.

KEEP IT LIGHT

You’re making a negotiation not going to war, so please feel free to keep it light. Use humor at certain times to get the other party to relax and thus become a little more flexible. If you do not consider yourself a funny person, simply smile and occasionally laugh lightly at prices, numbers or quantities you consider outrageous or too much. Besides, if you are not too serious with the negotiation process, you won’t appear desperate to the other party.

Know More About Flanges Before Contacting A Flanges Supplier

Features of flanges

Flanges can withstand great pressure and it is easy to use. In industrial pipeline, flanges connection has got wide application. So, if you are in a boiler room or production site, you will see flanged pipes and equipment scattered everywhere. While in families, however, because of small diameter pipe and low pressure, you can not see flange connection.

Flanges, often used to connect joints, has a wide application. Usually, its manufacturing processing is cast molding or forging punching. Nonetheless, casting flange doesn’t have uniform and compact inner organization while forged flange will cost a large amount of material and energy consumption. In this case, rolling manufacturing emerged as required, and it can solve all the problems mentioned above. Because the fiber of rolling distributes evenly and metal grain places closely, as well as the low energy consumption, good-quality surface, advanced molding quality, the development of rolling manufacturing is fast.

Differences Between Flat Weld Flanges and Butt Weld Flanges

Because of high production efficiency, easy operation and reasonable price, flat weld flanges and butt weld flanges are most common weld flanges. In most cases, people will choose these two kinds of flanges. But how to distinguish them and what is the difference?

First, different material. Flat weld flange use ordinary steel plate as the material while butt weld flange use forged steel for manufacturing.

Second, different pressure. Nominal pressure for flat weld flange is between 0.6Mpa to 4MPa. Compared with flat weld flange, nominal pressure for butt weld flange is smaller.

Third, different welding connection, and this is the biggest difference. The flat weld flange has a socket RF with the diameter bigger than the pipe, so that the pipe can be inserted and welded inside. The butt weld flange’s wall thickness and diameter are required to be the same with the pipe, so that both the inside and outside of the weld seam can be welded up.

Fourth, different steel degree. Flat weld flange has bigger steel degree than butt weld flange. But when it comes to strength, butt weld flange is higher with less leakage problem.

Measurement Methods of Carbon Steel Flanges
With the rapid development of long-distance pipeline construction at home and abroad, pipeline pressure test has become indispensable and important. Before and after the pressure test, cleaning must be done on each pipelines, usually the number is 4 to 5 times. Especially after the pressure test, it will become difficult to clean out the water in the pipeline, so the cleaning number should be increased. Using repeated welding head method may have these following problems: first, it will increase the labor intensity; second, large material consumption and high cost.

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