Solutions for HVAC units. SKF Solutions Street September 2007 Presented by Russ Hink

Transcription

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2 Solutions for HVAC units SKF Solutions Street September 2007 Presented by Russ Hink

3 Agenda 1. Industrial fan overview 2. Fan types 3. SKF fan solutions 4. Success story 5. Coming soon

4 Industrial fan overview

5 Where and why are fans used? HVAC units

6 Fan types

7 Axial fans (belt & direct drive)

8 Centrifugal fans (belt and direct drive)

9 Different type of fans Held bearing Direct driven Overhung, Direct driven Overhung, Belt Driven (Most Common) Center-hung, Direct driven Center-hung, Belt Driven

10 Catastrophic failure

11 Common fan problems Bearing over-heating Float bearing not moving axially Lubrication Mounted bearing clearance Seal friction High vibrations Misalignment Unbalance Bolt torque

12 SKF fan solutions

13 SRB/CARB bearing arrangement Free dynamic displacement with misalignment More even load sharing Less heat and vibration

14 Air handling sleeves For SRBs For CARB Improved tolerances Size range to bearing sizes Tighter running accuracy when compared to conventional sleeve Nomenclature: HA 317 E Narrow slot width E = KMFE nut KMFE lock nut (using set screw for locking) No lock washer No worries about roller stick out when using CARB

15 New SAF M5 design standard features Match marked cap and base Dimples in cap for RTD, Oil Vent, Seal area purge, and eyebolts Optimized foot design -Removed gussets (maintains adequate strength, reduces weight) Dimples for dowel pin drilling Flat square foot for ease in mounting and alignment (4) Centerline marks cast in

16 New SAF M5 design standard features Cast-in oil drain back feature reduces leakage Sump design suitable for grease or oil lubrication Threaded base for cap bolts eliminates need for nuts Solid steel dowel pins for accurate cap and base alignment

17 New SAF M5 design standard features Under-coring allows for uniform material cooling when cast, reduces weight Dowel pin support Cross for improved support & cooling Foot hole support 360 for improved housing bore roundness.

18 New SAF M5 design standard features SKF patented grease guiding system (507 thru 528)

19 SAF labyrinth seals A-9508 O-ring for oil applications to prevent oil leakage between shaft and seal (wider overall width), O-ring not included. LER Standard SAF pillow block seal until Oct 1998, provides grease and oil retention. Also provides protection from contaminants. Positrac (LOR) - New standard SAF pillow block seal as of Oct. 1998, combines features of LER and A-9508, but includes O-Ring, and provides the option to field retrofit Positrac Plus (LORC)

20 Teflon Positrac Plus sealing Recommended for fans because at high speeds the lip friction generates heat.

21 Defender tm bearing isolator

22 SONL housings The perfect solution hot gas fans

23 SONL housings Proven oil pick-up rings No wear on seating Prepared for circulating oil lubrication No roller contact No overheating

24 SONL housings Effective sealing No dirt in No oil out Prolonged bearing life Environmentally friendly

25 SONL housings

26 ConCentra units ConCentra units combine many of the benefits of an adapter sleeve assembly with the convenience of unit products.

27 Non-concentric vs. concentric mounting

28 ConCentra mounting

29 AH industry Reliable operational locking system Long bearing life i.e 15 years and more Lubed for life bearings Higher speed, higher pressures, lower power consumptions One balance operation to achieve balance goal Purchase of more assemblies vs. components, harmonize shaft, bearing and components Eliminate keyways in all applications, commercial grade shafting Reduce number of suppliers Easier (field) serviceability of the units Locking method for components that doesn't damage the shaft

30 ConCentra ball bearing unit Product features: Nearly 360 degrees fit with shaft Superior holding power vs. traditional locking methods Full bearing capacity utilization Operates at higher speeds Air Handling features Product benefits: Reduced operational vibration Commercial grade & hollow shaft capable No set screw damage or fretting to shaft Greater reliability and increased service life Easy mounting/dismounting Reduce service and warranty claims

31 ConCentra SHL bushing Product features: Nearly 360 degrees fit with shaft No key or keyway Ability to attach a number of components to shaft (i.e. fan hubs, sprockets, gears, etc.) Product benefits: Reduced operational vibration Keyless, commercial grade shaft capable Manufacturing cost reduction Process simplifications Material cost reduction Greater reliability and increased service life Easy mounting/dismounting

32 Totally concentric locking system

33 Concentric revolution Keys and keyways are a thing of the past Improve fan performance Reduce warranty claims Use commercial shafting Maintenance-free components and lubed-for-life bearings Service fans faster and easier

34 Automatic greasing systems

35 Grease re-lubrication calculations

36 Circulating Oil Lubrication

37 SKF Copperhead for fans monitoring solutions fit any housing and bearing Fault detection Y bearings, ConCentra, Unit Roller, Pop-Release SNL, SAF, SOFN Unbalance Mechanical looseness Bearing faults High temperature CMPT2310T sensor (vibration and temperature) One sensor per housing PDN

38 SKF fan monitoring solutions fault detection & condition monitoring TEMP VIB SENSOR FUNCTION RANGE SENSOR FUNCTION RANGE TEMP VIB SENSOR FUNCTION RANGE TEMP VIB SENSOR FUNCTION RANGE TEMP VIB VIB TEMP SENSOR FUNCTION RANGE SENSOR FUNCTION RANGE TEMP VIB TEMP VIB SENSOR FUNCTION RANGE -V +V OUTPUT OUTPUT L N -V +V OUTPUT 24VDC 0.6A L N Smart SNL Alarm functions analog signals including fan unbalance Each housing 2 x vibration 1 x temperature 1 x speed M1 V1 T1 M2 V2 T2 M3 V3 T3 M4 V4 T4 Fault detection Each sensor 1 x vibration 1 x temperature CPHD 2ECV C1 C1VEL C2 PLC/ DCS Periodic monitoring CPHD 2B Each sensor 1 x vibration 1 x temperature Smart SNL and the CPHD 3V systems are also suitable for use with Microlog and Marlin

39 Success story

40 SKF solution extends HVAC MTBF Problem HVAC unit operating under challenging conditions Solution CARB SKF Explorer bearings Split-housed units Labyrinth seals Result $180,000 cost savings 355% Return on Investment (ROI)

41 Coming soon!!!

42 SKF vertical heat exchange fan bearings units Unit ball Multifunction seal, SKF LGEP2 grease (lithium-calcium complex) and zinc-coated cover plate for a longer service life Special grub screws allow the bearing to move axially on the shaft - serves as the floating bearing in the arrangement Unit roller A high quality SKF CC design spherical roller bearing in a 'Held' design to allow support of axial loads SKF LGEP2 (lithium-calcium complex) grease and an optimized garter spring seal design for a longer service life Drain holes designed into the housing face to prevent the accumulation of water and debris against the insert bearing.

43 Questions?

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