Washing Machine

PART OF WASHING MACHINE :

1. Pump
2. Motor
3. Shock absorter
4. Solenoid valves 
5. Heater

6. Pressure sensor
7. Door lock and sensor
8. Temperature sensor
9. Fan 
10. Drum

THE FUNCTION PART OF  WASHING MACHINE  :

1. Motors: serves as the driving washing machine

3.The drum  : is the place dirty clothes to be washed

4.Control module, function is to manage the whole process of washing in the washing machine, start washing, rinsing and drying.

5.Shock absorter : is a spring that is useful to hold the tube washing machine

6.Pressure sensor ;  it’s function is to detect the presence of water under pressure.

7.Drain Pump ; serves to pump water out of the washing machine

8.Heater ; function is to heat the water in the washer for the washing process using hot water.

9.Door Lock ; serves to lock the door of the washing machine during the washing process as     a safety during the washing process.

10.Inlet Valve ; serves to regulate the entry of water according to the command controller.

DEFINITION

In principle the process of washing clothes on a washing machine consists of two parts, namely :
1. Washing

2. drying

Washing machine is one of them machine expecially use to wash the clotes automaticly. Be sides that, the function of washing machine is to dry after wash the clotes.

DIFFERENT OF WASHING MACHINE

Currently there are three types of washing machines, namely the twin tube or two tubes, front load and top load.

First, we see what the different between the Top load of the washing machine 2 tubes and 1 tube. When the washing machine with two tubes, a place to wash and dry in a different tube. In this type during the washing process, there is a propeller that spins at the bottom of the tube and do the washing process. While on a tube, tube for washing and drying is done in the same tube. This tube also rotates during the washing process.

In terms of water usage, with the Top load of the washing machine uses more water than washing machines front  load. This is because the Top load of the washing machine, water must be filled to the brim new machine run. While on the engine front opening, water will be released in small increments during the washing process. For electricity used at the Top load of the washing machine or a front load, generally about the same which is about 300 W when using plain water.

MEKANISM OF WASHING MACHINE

The most basic difference of these two types of washing machines is used the technology. Top load of the washing machine for horizontal rotation causes the water in it form a vortex which causes the clothing twist. In contrast, front load washing machine resembles a vertically rotating like wheel rotation causes the clothes always falling down so that clothes are not twist. Results laundering front load washing machine better than the top load of the washing machine, because the same technology used clothing slammed. This washing machine working system of the program selector into the control unit continues to be forwarded to the sensory component is received by the drive components, and the work of this feedback system.

Most device in the home have some short of control.for exampele,you can control the volume of a tv by using a remote control.the building blocks of a control system are :

 

Most control systems are closed loops.that means they incorporate a way of checking that the output is correct.in other words,they have feedback.the thermostat in a central heating system (fig.1) provides constant feedback to the control unit

 

                                                     Feedback

The control system of a modern washing machine has to take into account several different factors. These are door position,water level,water temperature,wash and spin times,and drum speeds. Most of them are decided when you select which washing program to use.

(fig. 2) shows a block diagram of a washing machine control system. You can see that this is quite a complex closed loop system using feedback to keep acheck on water level, water temperature, and drum speeds.

 

                                                        feedback

                                                        feedback

(fig 2)

The control unit is the heart of the system. It receives and sends out signals which control all the activities of the machine. It is also capable of diagnosing faults which may occur,stoping the program, and informing the service engineer what is wrong.it is a small, dedicated computer which,like other computers,uses the language of logic.

Door Position

The machine will not start any program unless the door is fully closed and locked. When the door  is closed, it completes an electrical circuit which heats up a heat-sensitive pellet. This expands as it gets hot, pushing a mechanical lock into place and closing a switch. The switch signals the control unit that the door is closed and locked. Only when it has received this signal will the control unit start the wash program.

Water Level

When a wash program  first starts it has to open the valves which allow the water in. There are usually two of these valves, one for hot water and one for cold. Each must be controlled separately depending on the water temperature needed for that program. The valvesare solenoid operated,i.e. they are opened and closed electrically.

The rising water is checked by the water level sensor. This is a pressure sensor. The pressure of the air in the plastic tube rises as it is compressed by the rising water. The presure sensor keeps the control unit informed as to the pressure reached and the control unit uses the information to decide when to close the water inlet valves.

Water Temperature

The temperature sensor,a type of a thermometer which fits inside the washer drum, measures the water temperature and signals it to the control unit. The control unit compares it with the temperature needed for the program being used. If the water temperature is too low, the control unit will switch on the heater. The temperature sensor continues to check the temperature and keep the control unit informed. Once the correct temperature is reached, the control unit switches off the heater and moves on the next stage of the program.

Clock

The control unit includes a memory which tells it how long each stage of a program should last. The times may be different for each program. The electronic clock built into the control unit keeps the memory of the control unit informed so that each stage of each program is timed correctly.

Drum Speed

During the washing and spinning cycles of the program, the drum has to spin at various speeds. Most machines use three different speeds: 53 rpm for washing ; 83 rpm for distributing the load before spinning ; 100 rpm for spinning.

The control unit signals the motor to produce these speeds. The motor starts up slowly, then gradually increases speed. The speed sensor, a tachogenerator, keeps the control unit informed as to the speed that has been reached. The control unit uses the information to control the power to the motor and so controls the speed of the drum at all times.