H08- External gear pump

A gear pump consist of two meshing gear. One of the gear is connected to a driving shaft known as driver gear which drives 2nd gear called driven OR idler gear. These gear are enclosed inside the housing. These pumps are particularly used to transfer viscous fluid.

Construction: In external gear pump consist of following parts, which are shown Fig. i

The gear used here may be either spur gear OR helical gear. Each gear is mounted on the shaft supported on bearing in the end covers. One of these shaft/Gear is connected to the drive motor. Two ports are provided in which one acts as inlet and another one acts as outlet and are located on opposite sides of the housing.

Working: As the gear unmeshes a partial vacuum is created at the inlet. Due to this partial vacuum the fluid is drawing into the chamber formed between the unmeshing of teeth. The chamber carry the fluid around the outside of the gear. As the gear stars meshing at outlet it forces fluid to out and fluid which left the chamber is at high pressure.

Here the pumping action takes place very rapidly.

Note:

How the pressure is created? a pump creates flow and pressure by resistance to flow I.e pressure results whenever the flow of the fluid is restricted. The fluid is drawn into pump chamber through the inlet port due to the partial vacuum, due to reduced in the space causes resistance to flow in the upstream side causes pressure to build up.

Advantages

a. Simple in construction.

b. Compact and occupies less space.

c. Have longer life.

d. Fewer moving part.

e. Noiseless operation.

f. Some gear pumps are reversible.

g. It can handle extensive range of viscosities.

h. Since the gear pump works at lower speed the Output is smoother and controllable.

i. These pumps are self priming pumps

Disadvantages

a. Their design is complicated hence it costs more the centrifugal pump.

b. They are limited in size.

c. Since the fluid flows in between moving parts, the fluid should free from the abrasive particles.

<< Previous Next >>

Comments

T01- Introduction to Turning on Lathe

What is turning ? Turning is a machining process used to generate cylindrical and conical surface by rotating the work piece and with the help of cutting tool. The machine where the turning process is usually carried on is called as lathe , where a cutting tool is fed against a rotating work-piece. What is the working principle of Lathe? The principle of operation is shown in the figure. Here both the work piece and the tools are rigidly held on the lathe. Then the tool is provided with longitudinal and transverse movement while the work-piece is being rotated at suitable speed. Basically three type of major surface can be produced depending on the movement of the tool, They are as follows:- I. When the tool moves parallel to the axis of rotation of the work piece, a cylindrical surface can be produced. Which is as shown below. II. When the tool moves at an angle to the axis of the work piece, a tapered surface can be produced. Which is as shown below. III. When the tool moves perpe

Jowar (ಜೋಳ)

It is flowering plant belongs to grass family Poaceae . It is also known as Sorghum, which is cultivated extensively in India and other country. Earlier Jowar was used in food made for animals but now people have started incorporating it in their diet due to its incredible health benefits. Now a day all bakery and homemade dishes make uses of all-purpose flour/Maida which is not good at all for health. A healthy alternative to all-purpose flour is jowar. This is rich in protein, Potassium, Calcium and other minerals. Since the jowar is gluten free, it plays a critical role in cellular function and repair. The rich quantity of Potassium & Phosphorus helps lower cholesterol and mange High B.P. The grain is incredibly rich in fiber and hence should be part of diet. Nutrition facts per 100 Gram: Total fat-3.5 g Saturated fat-0.6 g Total carbohydrate- 72 g Dietary fiber-6.7 g Sugar-2.5 g Protein-11 g Calcium-13 mg Iron-3.36 mg Potassium-363 mg Sodium-2 mg Benefits of jowar i) High fi

H09- Internal gear pump

A gear pump consist of two meshing gear. One of the gear is connected to a driving shaft known as D river gear which drives 2nd gear called D riven OR Idler gear . These gear are enclosed inside the housing. These pumps are particularly used to transfer viscous fluid. Constructional feature: In this type of the pump the meshing of the teeth takes place internally and hence the name internal gear pump.it consist of external gear which meshes with gear which contains internal gear as shown in figure. The pumping chamber is formed between the gear teeth. A crescent seal is machined into the space between the inlet and outlet OR meshing and unmeshing region of the gear where the clearance between the internal gear( annular gear) and external gear is maximum. Thus the crescent seal separates both inlet and outlet and it will not allow the fluid to return the inlet. Working : Low pressure oil from the inlet port is converted into high pressure oil at outlet as follows.

Learn more grow more.

Search This Blog