Chapter 116 Flashcards
Compressors can be divided into three main classifications:
Reciprocating
Rotary
Centrifugal
A piston travels back and forth in a cylinder, drawing in and compressing the liquids
Reciprocating compressor
Use of a helical (screws) or an eccentric rotor with vanes to compress the vapor
Rotary compressors
Rapid revolving impellers to draw in the vapor and discharge it at high velocity by centrifugal force. The high velocity low pressure vapor is converted to low velocity high pressure vapor before it leaves the compressor
Centrifugal compressors
Negative factor of the helical type reciprocating compressor is field service is?
Not possible
In the helical rotor compressor the mating screws intermeshing in one common?
cylinder casing
Reciprocating pumps can be divided into three types according to design:
Hermetic
Open
Semi hermetic
Where are hermetic reciprocating compressors most commonly used?
Low capacity compressors used in appliances
Main parts of a reciprocating compressor:
Pistons Connecting rods Crankshaft Compressor body Suction/discharge valves Compressor bearings
Two basic types of compressor valves commonly used are:
Flexible reed and disc valves
Non-flexible ring valves
If refrigerant enters the body of the compressor what part of the reciprocating compressor lifts to allow for fluid to flow into the discharge line?
Safety head
Compressor bearings are usually the?
Sleeve and shell type
The volume of refrigerant that can be circulated through all the cylinders in a given time
Piston displacement
Three rotary compressors:
Stationary single blade
Rotary sliding vane
Helical rotor or screw
In rotating mechanical seals the sealing ring is held in position by?
A spring
