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Description 

 

 

P1700040 

3.4  Function 

 

3.4.1  Principles of Vacuum Pump Operation 

 
The main purpose of a vacuum pump is to reduce the pressure in a vessel or a closed system. The 
degree of pressure reduction is dependent upon the requirements of the application and the type of 
vacuum pump employed. 
 

3.4.2  Working Principle of Rotary vane pumps 

 
Pressure reduction in a closed system is accomplished by repeatedly removing a portion of the 
original volume of gas contained in the system. Removal is performed by the action of the rotating 
elements of the pump which cause a given space to be successfully enlarged and diminished. Figure 
2 illustrates a chapter through a typical stage of rotary-vane pump. Note that this figure is not intended 
to illustrate exactly the internal components of the pumps; its purpose is to illustrate the general 
operating principles of vacuum pumps. 
 

 

 

Fig. 2   Rotary vane pump Principle 

 
The rotary action of the pump creates a hollow space of chamber (1) which expands as the pump 
rotates. As the chamber expands, the pressure in the chamber decreases. As a result, gas is drawn 
into the chamber due to the difference in pressure between the chamber and the inlet (4) to the 
chamber (The inlet is the only place where gas can flow into the chamber). Once the vane (3) moves 
past the inlet (4), it seals the inlet against the chamber (1) and the gas becomes trapped between the 
vanes (2 and 3). The chamber (1) formed by the enclosed space between the vanes then begins to 
decrease in volume as the rotor revolves, compressing the gas. The pressure of the compressed gas 
becomes greater than atmospheric pressure. When the vane (2) moves past the exhaust port (5) the 
compressed gas in the chamber is forced out through the exhaust port. This expansion/compression 
cycle constitutes one complete cycle of the pump operation. This cycle is repeated as the vane (2) 
passes the intake port and seals it against the atmosphere. Therefore, two pump cycles are performed 
during each revolution of the pump rotor. 
 
 
 
 

3.4.3  Working Principle of Two-Stage Rotary vane pumps (CRVpro Series) 

 

Summary of Contents for WELCH CRVpro Series

Page 1: ...Operation Manual EN Original version of the operation manual Rotary vane pumps Two stage Series CRVpro CRVpro 48 CRVpro 65 P1700040 2020 06 12 P1700011 2020 06 12...

Page 2: ...ion No 145 Pujian Road 200127 Shanghai China Phone 86 21 51860238 Fax 86 21 50396221 E Mail welch as gardnerdenver com www welchvacuum com Global Headquarters Gardner Denver Thomas GmbH Livry Gargan S...

Page 3: ...3 4 1 Principles of Vacuum Pump Operation 8 3 4 2 Working Principle of Rotary vane pumps 8 3 4 3 Working Principle of Two Stage Rotary vane pumps CRVpro Series 8 3 4 4 Oil Functions 10 3 4 5 Pump Lubr...

Page 4: ...ck 26 6 3 Oil Change 26 6 3 1 Draining the Oil 26 6 3 2 Filling up with Oil 27 6 3 3 Flushing 27 6 3 4 Frequency of Oil Changes 28 6 4 Shaft Seal Replacement 28 6 5 Major Factory Repair 28 7 Troublesh...

Page 5: ...on Information which are only relevant of UL operation are marked in following boxes For UL ONLY RELEVANT FOR UL 240 265 415 460 200 346 V 60HZ OPERATION Only relevant for UL 240 265 415 460 V 200 346...

Page 6: ...ary vane pumps must have the technical competence required to perform the work that has to be done and understand the hazards involved The user must authorize the operating personnel to do the work th...

Page 7: ...E 230 240 380 420 V 200 346 V 50HZ OPERATION The rotary vane pump meets the following product standards EN 60204 1 Safety of machinery Electrical equipment of machines Part 1 General requirements Obse...

Page 8: ...ons apply in foreign countries 2 2 Electricity Please note the following when connecting to the electrical power supply system The electrical power supply system must have a protective connector accor...

Page 9: ...foreign countries Combustible and explosive Gases Examine before switching on whether that can form gas combustible gas air mixtures which can be promoted Consider the regulations of the guideline 19...

Page 10: ...T VALVE 8 GAS BALLAST AIR PORT Fig 1 Rotary vane pump CRVpro 48 65 3 2 Area of Application The range of application of our oil sealed Rotary vane pumps encompasses the entire field of vacuum technolog...

Page 11: ...Description P1700040 7 Followed the scope of delivery for standard model numbers The scope of delivery for other model numbers is specified in the supply contract...

Page 12: ...pump creates a hollow space of chamber 1 which expands as the pump rotates As the chamber expands the pressure in the chamber decreases As a result gas is drawn into the chamber due to the difference...

Page 13: ...as remaining in the vessel expands to fill the vessel and consequently with each cycle the pressure in the vessel is reduced This is a manifestation of Boyle s Law which states that for a constant tem...

Page 14: ...um oil has been especially developed to have the proper viscosity low vapour pressure and chemical stability needed to produce peak pumping efficiency The ultimate vacuum guarantee on Welch pumps appl...

Page 15: ...densation takes place is dependent upon several factors including the proportion of permanent gases to vapours at the pump intake If the gases being pumped consist entirely of vapours condensation wil...

Page 16: ...Technical Data 12 P1700040 4 Technical Data 4 1 Dimensions Fig 4 Dimensions in mm 4 2 Pumping Speed Intake Pressure Diagram Fig 5 Pumping Speed Intake Pressure 50Hz Diagram CRVpro 48 65...

Page 17: ...let pressure bar 1 1 Max outlet pressure bar 1 35 1 35 Connection flanges DN 40 KF 40 KF Ambient temperature C 10 40 10 40 Noise level 50Hz dB A 58 58 Noise level 60Hz dB A 60 60 Type of protection IP...

Page 18: ...ight yellow The technical data and operating characteristics of Rotary vane pumps are only guaranteed if original Welch Directorr Premium vacuum oil is used 4 6 Order Numbers of Models Choose the conf...

Page 19: ...ng firm In case of a claim under warranty the device must be returned in packaging that is suitable for protecting it during transport 5 2 Pump Mounting For more rigid mounting requirements the pump b...

Page 20: ...to the surface See chapter 5 2 Pump Mounting 2 Remove the clamping ring and the protection cap of the suction and exhaust ports 3 Attach the vacuum connection to the suction port and the exhaust pipe...

Page 21: ...output The customer user shall install the main and emergency stop switches CRVpro48 65 are supplied with PTC embedded three phase motor but without accessories for electrical connection They must be...

Page 22: ...derstood or when in doubt as to whether the product is properly grounded Do not use an adapter with this product When the product must be reconnected for use on a different type of electric circuit th...

Page 23: ...er on the terminal box and tighten with the four screws Fig 9 Change the voltage setting 5 5 4 Motor Protection CRVpro48 65 are supplied with PTC embedded three phase motor Protect the motor and vacuu...

Page 24: ...ase power station and connect with the motor PTC Once the PTC sent out temperature rise signal to the power station then the power station will cut off the power supply and the user should restart the...

Page 25: ...again to see if it is low Also check the pump intake fitting to be sure that it is tight 4 Once proper pump operation has been verified the pump intake can be opened to the vacuum system 5 After runni...

Page 26: ...ballast turn the gas ballast switch to the position open or close Operation with gas ballast when drawing off condensable vapours We suggest operation with the gas ballast valve open provided that th...

Page 27: ...before performing a pump shutdown 1 If a gauge is connected to the system first isolate the gauge then turn off the power to the pump and open the system to the atmosphere 2 If condensable media have...

Page 28: ...a long period with oil initially in good condition check the oil when the pump is restarted and change the oil if necessary 5 14 Transport In case the pump has been filled with oil please note that o...

Page 29: ...During repair or maintenance work which could endanger people because of moving or electrically live components the vacuum pump must be made safe by removing the mains supply plug from the socket or...

Page 30: ...erature Brown or black oil or oil smelling as if it has burnt must be removed from the vacuum pump Flush the vacuum pump and fill up with fresh oil 6 3 Oil Change WARNING If the vacuum pump has been u...

Page 31: ...valid environmental protection regulations Do not overfill excess oil tends to be splashed out the pump exhaust Use only Directorr Premium vacuum oil For best dilution of contaminants especially on ch...

Page 32: ...n be replaced in the field See chapter 10 Overview of Spare Parts 6 5 Major Factory Repair Repairs and maintenance going beyond the extent of the work described in the previous chapters or recondition...

Page 33: ...ange Work or pressure control valve defective Exchange Intake valve defective Repair Oil supply to pump aggregate reduced Oil superimposition interrupted by work valve Repair Built up pressure in the...

Page 34: ...P1700040 Trouble Cause Remedy by with switched off possible rise in oil pressure Opened gas ballast valve User Close the gas ballast valve Cable s defective and or brittle Qualified electrician Excha...

Page 35: ...406 99 Side Panel Fitting Kit For CRVpro 48 65 S3256 99 Sealing kit For CRVpro 48 65 S3410 99 Oil Directorr Premium vacuum oil 1 liter 800995 01 Directorr Premium vacuum oil 5 liter 800995 05 Director...

Page 36: ...5 gallon 8995P 25 Thermistor module PTC Module GRB 3B 220 3 S3488 99 8 3 Sorption trap ADT Mode of action The gas flows from the recipient via the gas inlet into the sorption trap passes by the sorpti...

Page 37: ...S3408 99 Consisting of Qty Order no 6 Screw 4 S3178 99 84 ScrewCRVpro 48 M10 270 4 S3465 99 ScrewCRVpro 65 M10 310 4 S3466 99 88 Nut 4 S3469 99 87 Elastic washer10 4 S3468 99 86 Flat washer 4 S3467 9...

Page 38: ...5 x2 1 S3445 99 24 O ring92 x3 5 1 S3424 99 98 O ring 1 S3476 99 19 O ring26X2 65 1 S3172 99 20 Oil seal SC 10164 1 S3019 99 27 O ring42 x5 3 2 S3427 99 96 O ring14 3 2 S3063 99 101 O ring21 x2 65 1 S...

Page 39: ...S3405 99 CRVpro 65 S3406 99 Consisting of Qty Order no 4 Coupling Element 1 S3414 99 74 Fore CRVpro 48 2 S3457 99 Fore CRVpro 65 2 S3458 99 73 Vane spring 4 S3456 99 82 Rear Vane 2 S3463 99 65 Exhaust...

Page 40: ...99 9 6 Side Panel Fitting Kit The side panel fitting kit contains all the parts could be replaced during a preventive maintenance or repair For the rotary vane pumps CRVpro 48 65 Order no S3256 99 Ite...

Page 41: ...Qty CRVpro 48 65 Order no 1 Motor ASSY 230 240 380 420 V 5 50Hz 240 265 415 460 V 5 60Hz 1 S3486 99 Motor ASSY 200 346V 50HZ 10 200 346V 60HZ 10 1 S3487 99 2 Pump fan 1 S3412 99 3 paper washer 1 S341...

Page 42: ...25 99 26 KF40 Filter 1 S3426 99 27 O ring42 x5 3 2 S3427 99 28 Rubber sheet 2 S3428 99 29 KF40Blank flange 2 S3429 99 30 KF40 Hoop 2 S3430 99 31 ScrewM5 12 7 S3089 99 32 ScrewM4 16 1 S3093 99 33 Elast...

Page 43: ...9 Pin8 2 S3453 99 70 Fore CRVpro 48 1 S3454 99 71 Fore CRVpro 65 1 S3455 99 72 Flat keyA3 6 1 S3106 99 73 Vane spring 4 S3456 99 74 Fore CRVpro 48 2 S3457 99 75 Fore CRVpro 65 2 S3458 99 76 Pin8 2 S34...

Page 44: ...99 99 Glass 1 S3477 99 100 Oil window 1 S3478 99 101 O ring21 x2 65 1 S3018 99 102 Oil fill plug 1 S3056 99 103 Washer 1 S3479 99 104 Exhaust Port 1 S3480 99 105 KF40Centre rest 1 S3481 99 106 nut 1 S...

Page 45: ...se when The warranty card has been completed and returned The product is returned to the factory or other designated service center freight prepaid The product in our judgment is defective through no...

Page 46: ...EC Declaration 42 P1700040 11 EC Declaration...

Page 47: ...1601 Feehanville Drive Suite 550 Mt Prospect IL 60056 USA Phone 1 847 676 8800 Fax 1 847 677 8606 E Mail welch na gardnerdenver com www welchvacuum com Asia Pacific Gardner Denver Room 2206 Qiangshen...

Page 48: ...Global Contact 44 P1700040 DON T PRINT THE FOLLOWING PAGES Changing log Date Version Changing description Change Owner...

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