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| Pneumatic Connection Solutions: Pneumatic Fittings, Pneumatic Push in Fittings and Pneumatic Connectors. |
| News From NingBo Pace Pneumatics Co.,Ltd. |
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This is a strike and return type moisture separator. When the compressed air enters the separator, it strikes against the baffle and turns sharply before falling down. When air falls down, it again strikes the case bottom and then rises up. The water droplets
and oil are then separated from the compressed air by the centrifugal force produced by the sharp turning action.
1.1.2.3 Receiver: it is used to store a certain amount of compressed air, reduce its pressure fluctuation and provide gas continuously and stably. There are two types of receivers: horizontal and vertical. Vertical type receivers are more often adopted to save room.
Nowadays, the arrangement with the combination of cooler, moisture separator and receiver has found many applications.
1.1.2.4 Air dryer: the compressed air after having been purified and treated by the cooler, moisture separator and receiver can meet the requirements of general pneumatic systems. But for other precise devices such as precise machines and meters, the compressed air must be further purified or treated. Air dryers have the function of further removing water vapour, oil mist and other particle impurities with mini diameter. Methods of air drying incorporate mechanical, centrifugal force, refrigeration, adsorption, etc.
1.1.3 F. R. L. combination
F. R. L. combination is short for the combination of an air filter, a pressure reducing valve and an oil mist lubricator. First comes the air filter (secondary filter), followed by the pressure reducing valve and the oil mist lubricator is set behind (see from the air inlet direction). F. R. L. combination supplies better quality compressed air for pneumatic components or systems.
1.1.3.1 Air filter
An air filer is used to remove dust, impurities, oil stain and separate water vapour from the compressed air. As compressed air passes the inlet port and enters the filter section, it passes through the directional louvers forcing it into a whirling flow pattern. Liquid particles and heavy solid are thrown against the inside wall of the bowl by centrifugal force. The liquid then runs to the bottom of the bowl where it is either removed by the automatic drain assembly or by the manual drain the baffle maintains a “quite zone” in the lower portion of the bowl to prevent air turbulence from picking up the liquid and returning it to the air stream. The air then passes through the filter element to remove solid contaminants. The automatic drain assembly dumps the liquid as it collects.
1.1.3.2 Oil mist lubricator
An oil mist lubricator is one type of oiling devices. The compressed air enters the lubricator, ejecting the oil lubricant into a spraying fog which flows with the compressed air into the components that need to be lubricated.
1.1.3.3 Pressure reducing valve
Pressure reducing valve is one component of F. R. L. combination. It is used to reduce the pressure of compressed air from gas source to meet the pressure requirement of a given pneumatic system. The pressure after a pressure reducing valve is kept stable, avoiding both the influences of gas-source pressure fluctuation and its output flow rate change. Like hydraulic transmission, the pressure regulating methods of pressure reducing valves incorporate: direct action type and pilot operated.
1.2 Pneumatic Actuators
1.2.1 Pneumatic cylinders
1.2.1.1 Operations and functions
The operations and functions of common cylinders are similar to those of hydraulic cylinders. Only some special cylinders are discussed in this section.
(1) Diaphragm cylinders
A diaphragm cylinder is basically a large diameter, short stroke cylinder fitted with a diaphragm instead of a piston. The construction usually takes the form of a pair of shallow convex housings, with a diaphragm sandwiched between them and a piston rod attached to the diaphragm. They are usually of single-rod type, either single-acting with spring return or double-acting.
Diaphragm cylinders are capable of generating very large forces with very short strokes and are commonly called thrusters. The theoretical thrust available is equal to the product of the applied air pressure and effective diaphragm area. The stroke is normally limited to a maximum of about one-third of the cylinder diameter.
Diaphragm cylinders are simple, concise in design, low cost, small leakage, easy to manufacture and maintain. |
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