Frick RWB II, Установка, эксплуатация и обслуживание

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RWB II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
S70-200 IOM
Page 29
Clean all parts thoroughly and examine for wear or dam age.
Check lip seals, ball bearings, bushing, and idler pin and
replace if necessary. Check all oth er parts for nicks, burrs,
excessive wear and replace if necessary.
Wash bearings in clean solvent and blow out with com-
pressed air. Do not allow bearings to spin; turn them slowly
by hand. Spinning bearings will damage race and balls. Make
sure bearings are clean, then lubricate with refrigeration oil.
Check for roughness by turn ing outer race by hand and re-
place bear ings if they have rough ness.
Be sure shaft is free from nicks, burrs and foreign particles
that might damage mechanical seal. Scratch es on shaft in
seal area will provide leakage paths under mechanical seal.
Use fi ne emery cloth to remove scratches or sharp edges.
DEMAND PUMP ASSEMBLY
Assembly Notes On Standard Mechanical Seal (Syn thet ic
Rubber Bellows Type)
NOTE: Read carefully before reassembling pump
The seal used in this pump is simple to install and good
per for mance will result if care is taken during installation.
The principle of mechanical seal is contact be tween the
ro ta ry and stationary members. These parts are lapped
to a high fi nish and their sealing ef fec tive ness depends on
com plete contact.
Prior to installing rotary portion of mechanical seal, prepare
and organize rotor shaft, head and idler assemblies and ap-
pro pri ate gaskets for quick as sem bly
Once rotary portion of mechanical seal is installed on rotor
shaft, it is necessary to assemble parts as quickly as pos-
si ble to ensure that the seal does not stick to shaft in wrong
axial position. The seal will stick to the shaft after several
minutes setting time.
Never touch sealing faces with anything except clean hands
or clean cloth. Minute particles can scratch the seal faces
and cause leakage.
1. Coat idler pin with refrigeration oil and place idler
and bush ing on idler pin in head. If replacing a carbon-
graphite bush ing, refer to "Installation of Car bon Graph ite
Bush ings".
2. Clean rotor hub and casing seal housing bore. Make
sure both are free from dirt and grit. Coat outer diameter
of seal seat and inner diameter of seal housing bore with
re frig er a tion oil.
3. Start seal seat in seal housing bore. If force is nec-
es sary, protect seal face with a clean cardboard disc and
Figure 28
Figure 29
gen tly tap it in place with a piece of wood. Be sure seal seat
is com plete ly seated in the bore.
4. Place tapered installation sleeve on shaft. Refer to
Fig ure 28. Sleeve is furnished with GG, AS, AK, and AL
re place ment mechanical seals. Coat ro tor shaft, tapered
in stal la tion sleeve, and inner diameter of mechanical seal
ro ta ry mem ber with a generous amount of refrigeration oil.
Pet ro la tum may be used but grease is not rec om mend ed.
5. Place seal spring on shaft against rotor hub. Re fer to
Fig ure 29.
6. Slide rotary member, with lapped contact surface
fac ing away from spring, over installation sleeve on shaft until
just con tacting the spring. Do not com press spring. Remove
installa tion sleeve.
7. Coat rotor shaft with refrigeration oil. Install shaft
slowly pushing until the ends of rotor teeth are just below the
face of the casing.
8. Leave the rotor in this position. Withdrawal of ro tor
and shaft may displace the carbon seal ro tat ing face and
re sult in damage to the seal.
9. Place O-ring gasket on head and install head and
idler assembly on pump. Pump head and casing were marked
before dis as sem bly to ensure prop er reassembly. If not, be
sure idler pin, which is off set in pump head, is po si tioned up
and equal distance between port connections to allow for
proper fl ow of liquid through pump.
10. Tighten head capscrews evenly
11. Pack inner ball bearing with multipurpose grease,
NLGI #2.
GG, HJ, HL: Install bearing in casing with sealed side to wards
head end of pump. Drive the bearing into the bore. Tap the
in ner race with a brass bar and lead hammer to po si tion
bearing. In stall inner snap ring.
AS, AK, AL: Install bearing retainer washer over the shaft
before in stall ing ball bear ing. Install ball bear ing in casing with
sealed side towards head end of pump. Drive the bear ing
into the bore. Tap the inner race with a brass bar and lead
hammer to position bear ing.
12. GG, HJ, HL: Install shaft snap ring in groove in the shaft.
See Figure 26.
AS, AK, AL: Install bearing spacer over shaft and against
single row ball bearing. See Figure 27.