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Posts Tagged ‘pressure’

The Open type was a common injecting method used in earlier days. In an injection system, fuel from the tank goes to the combustion chamber, via a pump. The pump increases the pressure to convert the fuel into very particles. These fine particles evaporate more quickly and produce more power inside the combustion chamber. During the injection, the actual combustion starts when the fuel pressure is more than the pressure inside the combustion chamber. If the pressure is below the pressure inside the engine, a non return valve closes the passage, from where the fuel enters. Closing the passage may stop the injection process completely. Delivery pipe, which had been in earlier days, was short due to the space consideration inside the engine. Such system is totally dependent on the diameter and length of the delivery pipe, which often leads to problems like pre-ignition and after burning. So today, cars equip with closed type injector to overcome the disadvantages of the open type.

Close Injector:

In this type, the hydrostatic pressure is also considered for the opening and closing of the nozzle. There is a spring in the valve, which opens and closes according to the hydrostatic pressure. When the hydrostatic pressure, available at the valve is greater than the spring force, the valve opens. Opening of the valve also opens the passage to the nozzle. When the value of the hydrostatic pressure goes below some value, valve closes again and there is no fuel supply to the combustion chamber.

Nowadays, the close type also implements the sensors, which can react rapidly to changing inputs. It is also very sensitive to sudden acceleration and deceleration of the throttle. This increases the power output and performance of the engine, as well as provides economical savings. Due to these advantages, close type are widely used injectors nowadays.

Types of Nozzles

1. Single Hole: In this type, there is only a single hole at the center of the injector. Fuel injects into the combustion chamber through this hole. The fuel travels vertically downwards in such type of nozzle.

2. Multi Hole: In this type, there is more than one hole at the tip of the injector. The numbers of holes at the tip is depends on the many factors like size of the engine, power output of the engine. These types are widely used now days. It savings the fuel thereby increasing the power output.

In public service buildings, academic and retail and other premises where there relatively large, frequent and constant movement of people in and out of a space it is often best to install and automatic door system. Many types of swing doors can be installed for the first time with new frames and door leaves or they can be retro-fitted to an existing door. Swing doors are a popular choice and there are different options available to suit different situations.

Main Types

Low energy swing doors are particularly suited to and are safer for situations where there many disabled users. The low energy operator opens the door at a lower speed with lower kinetic energy levels, and there are low opening and closing pressures. These systems can incorporate push buttons to trigger the opening sequence. The ‘power assist’ low energy operator lets a user open the door using minimum force.

A full energy unit which could be fully automatic can open and close a door at full speed and the opening and closing pressure is relatively firm. To make this kind of system effective and safe, radar activating devices and safety devices mounted on the door are used. Full energy door operators are most likely to be used on the outside of medium size offices and retail premises.

A folding version is suited to situations where there is not enough space in the doorway to practically and safely allow a door swinging action.

Different Operators

Different swing door operators can incorporate different technologies, and how the motor’s energy is applied is the main way of telling the difference between them. For example electro-mechanical operators use purely mechanical parts and means to open a door, and there are disengaging or permanently engaged versions of this. An electro-hydraulic operator on the other hand drives a hydraulic pump so that oil pressure is used to operate the door.

Different Sensors

Sensors tend to apply to full energy operators and modern sensors use infrared to detect approaches to the door going in (on the approach side) and any potential obstructions in the swing area. These sensors can be mounted in different ways. For example header mounted and door mounted sensors can be used on the approach side to make sure nobody is in the way of the door operation. A safety beam can also be used to make sure that nobody will be injured if they are in the swing area of the door.

In public service buildings, academic and retail and other premises where there relatively large, frequent and constant movement of people in and out of a space it is often best to install and automatic door system. Many types of swing doors can be installed for the first time with new frames and door leaves or they can be retro-fitted to an existing door. Swing doors are a popular choice and there are different options available to suit different situations.

Main Types

Low energy swing doors are particularly suited to and are safer for situations where there many disabled users. The low energy operator opens the door at a lower speed with lower kinetic energy levels, and there are low opening and closing pressures. These systems can incorporate push buttons to trigger the opening sequence. The ‘power assist’ low energy operator lets a user open the door using minimum force.

A full energy unit which could be fully automatic can open and close a door at full speed and the opening and closing pressure is relatively firm. To make this kind of system effective and safe, radar activating devices and safety devices mounted on the door are used. Full energy door operators are most likely to be used on the outside of medium size offices and retail premises.

A folding version is suited to situations where there is not enough space in the doorway to practically and safely allow a door swinging action.

Different Operators

Different swing door operators can incorporate different technologies, and how the motor’s energy is applied is the main way of telling the difference between them. For example electro-mechanical operators use purely mechanical parts and means to open a door, and there are disengaging or permanently engaged versions of this. An electro-hydraulic operator on the other hand drives a hydraulic pump so that oil pressure is used to operate the door.