Compressor Main Spare Part Structure InstructionThe basic part
mainly includes: crank case, crankshaft, connecting rod, cross
head, its role is to connect the foundation and the cylinder part
and transmit power.The performance of a reciprocating piston
compressor mostly depends on a suction filter, suction &
discharge valves, and piston rings. Hence due care required to
be taken.Above mentioned parts especially valves require
a periodic inspection and maintenance.Connecting Rod The
connecting rod is divided into two parts: connecting rod body and
connecting rod big end bush cover, which are connected into a whole
by two tensile bolts. The connecting rod big end bush is split
type. The material of bush back is carbon steel. The bush surface
is bearing alloy. The two ends are flanged for axial positioning.
The inner surface of big end hole is inlaid with cylindrical pin,
which is used for radial positioning of big end bush to prevent the
Bush from rotating. The connecting rod small end and small end bush
are integral type, and the bush material is tin bronze. The
screw hole at the big-end tile cover of the connecting rod is used
for lifting when disassembling, and the eye bolt should be removed
after assembly.Crosshead hydraulic connection fastening deviceThe
hydraulic connecting and fastening device is used for connecting
the piston rod and crosshead body, which is mainly composed of the
connecting device and the fastening device.Principle: after
connecting the piston rod and crosshead by connecting the fastening
device, inject 150MPa pressure oil into the pressure body of the
fastening device with the random tool of manual high pressure oil
pump. By using the incompressible property of liquid, push the
piston, force the end of piston rod to produce elastic tensile
deformation, and then lock the lock nut, release the oil pressure,
so as to achieve the pre tightening force required for
connection.Connecting Cylinder The connecting cylinder is a
cylindrical structure made of cast iron. There are two types of
single chamber and double chambers. For the compression of
flammable, explosive or toxic media, the double compartment type is
adopted. The intermediate sealing packing is installed at the
middle compartment. Which is used to prevent leaking gas from the
cylinder from entering the compressor. Each chamber is provided
with a vent at the top and a blowdown valve at thebottom. The
chamber on the cylinder side is provided with nitrogen filling,
leakage recovery, cooling water connection flanges and joints as
required for connection with external pipeline: The leakage gas of
the main packing and the leakage gas of the short-middle body can
be discharged to the safe area through the external pipeline. The
nitrogen gas in the long-middle body can be continuously replaced
by external pipeline. There is no intermediate sealing packing and
nitrogen filling port for the single-chamber of connection
cylinder, and the other interface are set as required.CylinderThe
cylinder is mainly composed of cylinder seat, cylinder and cylinder
head. It is made of cast iron and equipped with cooling water
interlayer.The cylinder is provided with a support leg for
supporting the cylinder weight and adjusting the cylinder
level.Piston The piston parts are composed of piston,
piston rod, piston nut, piston ring, support ring and other parts.
Each stage of the piston is equipped with a different number of
piston rings and support rings for sealing the compressed medium
and supporting the weight of the piston.Sealing
Packing The sealing packing is composed of a plurality
of sealing elements, and each group of sealing elements is mainly
composed of a gas blocking ring, a tangential sealing ring, a flow
blocking ring and a tension spring. In order to reduce the working
load of each group of sealing elements, when the sealing pressure
is high, a throttle ring is provided near the cylinder side.For the
oil-lubrication type, there is an oil injection hole in the sealing
packing, which can be injected the lubrication oil. For the
oil-free type, there is no oil injection hole.Each stuffing box is
equipped with a group of sealing elements, which are composed of
gas choke ring, tangential ring and flow choke ring. The sealing
element material is divided into copper alloy or filled with PTFE
plastic ring. The copper ring is only used for oil lubrication
occasions, and the plastic ring is suitable for oil lubrication
type or oil-free lubrication occasions. This machine adopts PTFE
plastic ring.Gas Valve The gas valve is mainly composed of
valve seat, valve cover (lift limiter), valve plate and spring
(mesh valve and buffer plate and lift pad). The valve spring is
made of stainless and acid resistant steel wire, which has high
corrosion resistance and fatigue resistance, and can significantly
improve the service life of the valve.Oil ScraperThe oil scraper is
mainly composed of gland, shell (oil scraper box), oil scraper ring
and tension spring
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