Design a GEAR Pump by doing all the calculations and creating CAD model of the GEAR pump according to the design parameters acquired through calculations
PowerPoint Presentation MANTECH 4PD3 A typical assembly includes a base mount AC motor, a rigid clamping shaft coupling and a gear pump. Sevastian Irimie Rectangle Sevastian Irimie Rectangle Sevastian Irimie Rectangle The project objective is to design the gear pump Gear pumps are a positive displacement rotary pump with two gears of equal size. Fluid is drawn into the pump by the gear teeth as they come out of mesh and is carried to the discharge side of the pump by the rotating gears where it is forced from the pump by the meshing teeth. The inlet port of the pump is on the side where the gears are coming out of mesh; the discharge port is on the side of the pump where the gears are coming in to mesh. The pump is used to transfer a non abrasive, low viscosity oil (density = .036 lb/cubic in). External Gear Pump 000092551 Highlight Gears An external gear pump unit is to be designed according to the data provided and the following specifications. You will use Class "C" - Quality 10 Spur Gears with 20° pressure angle. The service is continuous, with indefinite life. Gear material: Carburized steel or nitrided , ground after heat treating to achieve a precision tooth form. “Machinery’s Handbook” (Pg.2148) Gears will be positioned in the shaft by a square key, and locked in position by two retaining rings. (Carbon spring steel 1060-1090). .005-.007" .002-.003" O Ring 000092551 Stamp Gear Housing Inlet port diameter has to be smaller than b (gear width). Sut=50 kpsi, Syt=40 kpsi. Shafts and Keys Compute shaft diameters based on DE ASME method (FS=2.5-4.5). Use ASME code for shaft design. Initial material could be assumed as AISI 1040 CD. Sut=80 kpsi, Syt=71 kpsi. Design the keys with suitable material. (length 70-150% of shaft dia) The working temperature of the pump is between 32-140 deg Fahrenheit. Make sure you take in consideration shaft thermal expansion. The shaft is subjected to constant torque and reversed bending. See Links for retaining ring number Fillet radii for both internal and external retaining rings. Bearings Both bearings will be locked on the shaft by retaining rings. Preferable bearings should be sealed from the manufacturer. Mechanical seal We will use a type 8-1 heavy duty mechanical seal, suitable for medium-high inlet pressure. Bearing and Seat Housing Cap screws Gasket Lockwashers Mechanical Seal Head Mechanical Seal Seat Shaft Support Bearing Drive Shaft Threaded pipe fitting - e Pu1np Li11er Plates These components are located on both sides of the cylinder for pumps that require them. They are typically used when the bearing plate ·wear surface is not acceptable for the gear to rotate against, or in situations where the liquid being pumped is extremely abrasive. Northern Pump offers several options for materials of construction, most of which are very hard. An extremely valuable benefit of the liner plates is the ability to replace them during an overhaul, thus, reducing maintenance and life cycle costs. '' - ' ' ' - 000092551 Stamp 000092551 Stamp 000092551 Stamp 000092551 Stamp 000092551 Stamp e Pu1np Beari11g Plates These components are located on both sides of the cylinder, or outside the liner plates on pumps that are liner plate equipped. Their main purpose is to hold the main shaft bearings. They will have O-rings on both sides. ASTM A48 Cast Iron Most standard and medium pressure applications 000092551 Stamp 000092551 Stamp 000092551 Stamp e Seal Housing or End Cap The seal housing holds the needle roller bearing and the oil seal. The bearing is greased externally through a grease fitting. This bearing helps stabilize the shaft which extends seal life. The housing is sealed with a gasket and O-ring (Nitrile Rubber - NBR). We will use radial positive contact seal (MHSA type-Nitrile Rubber - NBR) to seal the shaft. A suitable bolt pattern will be used to hold the end cap. Material: Ductile cast iron ASTM A536 Specify the weight of the Gear Box in the assembly's drawing title block. Apply proper rounds and fillets for the entire design. Apply proper material for all part files. Specify the weight of the gear pump in the title block. The gear pump will have attached two eye lifting bolts. Fits and tolerances:(suggested) LT5- shaft and gear Slide Number 1 Slide Number 2 Slide Number 3 Slide Number 4 Slide Number 5 Slide Number 6 Slide Number 7 Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page Blank Page bearings |Efficiency PARAMETER DISTANCE DEFINITIONS External Needle bearing je——— Lmax —> retaining rings Std dia Mechanical seal seat Mechanical seal Ball bearing (or Cylindncal Roller Bearing for hiaher dvnamic loads) GEAR PUMP DESIGN PROJECT INTERIM REPORT – SHAFTS, KEYS AND BEARINGS DESIGN 1. Analyze primary and secondary shafts using DE-ASME equations. Factor of safety against fatigue should be a minimum of 2.5 - 4.5. All calculations are to be referenced and presented in the formal report. 2. Select suitable SKF (or other) bearings from appropriate references or the SKF website. Verify the bearings’ suitability using appropriate analysis. Use 25 khrs as a starting point for your desired life for the bearing selection. Bearings should be sealed from manufacturer. 3. Design the keyways, keyseats and keys according to the shaft diameters and required hub lengths. Verify through proper analysis that the keys will have a lower factor of safety than the shafts and the hub of the gears. Select a proper material for your key. Submit the following files to AVENUE on the date specified in Announcements. DRAWINGS Include the following files in SLDASM, SLDPRT and in PDF formats. 1. Design of shafts, bearings, keys and any other components as subassemblies and detail drawings. 2. Subassemblies (one exploded for each shaft with BOM and one of each of the two shafts which illustrate broken out sections of critical component fits and details, ie. Bearing inner race radii and shoulder radii, keyway radii and key fitment requirements, gear hub/key/shaft, retaining ring grooves with ring, etc..) and detail drawings of redesigned shafts, keys and bearings. Detail drawings should be FULLY dimensioned and include a revision table and proper title block to ANSI standards, and GDT to ASME Y14.5- 2018 standard. NOTE: All files should be present to allow the subassemblies and parts to be opened in SolidWorks. REPORT (Submit as ONE file in PDF format only) 1. Front cover sheet should include Title, Case Number, Group Number and Names, Date of Submission. 2. Fully detailed Table of Contents for the full report package. Appendices should also include a Table of Contents indicating the information included in each. 3. Executive summary (inserted before drawings) at the front of the report should include initial case parameters, justification for any revised parameters due to the redesign and all factors of safety and all design changes summarized in tabular form. Also include a detailed labeled diagram of shaft(s) locations which were analyzed. 4. Drawings of subassemblies and corresponding detail drawings for all components in proper order. 5. All analysis of shaft(s) F.O.S’s, key design and bearing selection calculations on the provided calculation sheet format including references, dates and designer’s name(s). 6. Appendices will include copies of all references such as bearing specs, material specs, and all supplier information for purchased components. Appendices should also include a Table of Contents indicating the information included in each. REPORT and ANALYSIS: (15 Marks) Format (page layout, dates, references, etc…) /2 Summary of Design Changes /2 Force Analysis (loads, V, BM, Torque diagrams) /2 Stress Concentration Factors (shoulders, grooves, keyway) /2 DE-ASME Design equations (factors of safety and diameter re-design) /3 Key Calculations /2 Bearing Selection Calculations /2 DETAIL DRAWINGS (15 Marks) Title Block /2 Revision Table and Notes /2 Critical Dimensions (Required Tolerances, major shaft dia’s, /8 bearing seats, keyway, retaining rings, etc…) Datums and GD &T /3 TOTAL /30