Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
  • F04C2/00—Rotary-piston machines or pumps
  • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
  • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
  • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
  • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
  • F04B53/162—Adaptations of cylinders
  • F04B53/166—Cylinder liners
  • F04B53/168—Mounting of cylinder liners in cylinders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
  • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
  • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

• Airless spray pumps for the spraying of paints and other coatings.
• Airless spray pumps for the spraying of paints and other coatings via the airless method are well known and have traditionally been divided into two types, diaphragm pumps for the lower end of the market and reciprocating piston pumps for the higher end.
• An airless spray pump is provided with a single-acting piston pump which allows the use of a low-cost yoke drive. Motor and pump shaft are offset for most efficient force utilization.
• the main drive housing has a motor mounted to the rear thereof.
• a gear assembly uses gear teeth which are formed with a 5° helical angle and have a 25° pressure angle. This geometry combines the higher efficiency of straight cut gears with the noise reduction typified in a helical design.
• An eccentric is molded onto the front of the gear assembly and has located thereabout a bearing assembly which rides inside a yoke.
• the yoke moves vertically on guide rods which are retained in pockets of the drive housing.
• the yoke is molded of plastic as is the gear assembly leading to lower cost and easier manufacture.
• the pump rod is provided with a cap over the top end thereof which has bearing.
• Pump assembly is designed as a single acting pump, that is, the pump only pumps on the downward stroke and loads on the upward stroke. This allows the components of the drive train, including the yoke and gear, to be much lighter as the yoke ends up being more of a guidance device rather than a force-applying device.
• the motor and pinion are offset from the centerline of the pump assembly. This arrangement does not have any significant cantilevering as the pump rod, pinion, yoke, eccentric and cap are all located in the same plane.
• the location of the rod and the single acting pump with respect to the gear centerline reduces the thrust loads on the yoke.
• the location of the pinion on the gear partially offsets and reduces the pump forces on the gear shaft and bearings.
• the shaft packing assembly is comprised of a packing housing which screws into the pump housing and which contains a felt member which has been soaked with throat seal lubricant or other solvent or lubricant.
• a stack of v-packings are compressed in place by wave spring which is tightened by tightening the seal housing into the pump housing .
• the inlet check is provided with a check ball and a check seat which is pressed into a check housing and which is held in place by a retainer. These parts all press-fit into one another such that the complete assembly be merely screwed into main pump housing for replacement.
• outlet check assembly is formed of an outlet check housing which is screwed into a pump housing and similarly is provided with a check ball held in place by a retainer. The outlet passageway is angled relative to the axis of the pump shaft.
• FIG. 1 is a prospective exploded view showing the airless spray pump with the instant invention.
• FIG. 2 is a simple front plan view of the drive assembly and pump of the instant invention.
• FIG. 3 is a side plan view of the assembly shown in FIG. 1.
• FIG. 4 is a detailed exploded view of the circled area in FIG. 3.
• FIG. 5 is a cross-sectional view of the pump of the instant invention.
• FIG. 6 shows more details of the drive assembly of the instant invention.
• FIG. 7 is another cross-sectional view of the pump portion of the instant invention.
• FIG. 8 is a cross-section of the outlet filter of the instant invention.
• FIG. 9 is an exploded view of the outlet filter of the instant invention.
• FIG. 10 is a perspective exploded view of the instant invention.
• the instant invention generally designated 10 is comprised of a main drive housing 12 having a motor 14 mounted to the rear thereof.
• a gear assembly 16 having a rear bearing 17 and gear teeth 22 is inserted into the bearing housing 20 of drive housing 12.
• Gear teeth 22 on gear assembly 16 mate with the teeth on pinion 24 on the end of motor 14.
• the teeth 22 and on pinion 24 are formed with a 5° helical angle and have a 25° pressure angle. This geometry combines the higher efficiency of straight cut gears with the noise reduction typified in a helical design.
• An eccentric 25 is also molded onto the front of gear assembly 16 and has located thereabout a bearing assembly 28 which rides inside a yoke 30.
• Yoke 30 moves vertically on guide rods 32 which are retained in pockets 34 of drive housing 12.
• Yoke 30 is molded of plastic.
• Gear assembly 16 is cast in ZA-12 with an integral counterweight leading to lower cost and easier manufacture.
• Pump rod 36 is provided with a cap 38 over the top end thereof which has bearing upon it bearing 28.
• Pump assembly 40 is designed as a single acting pump that is the pump only pumps on the downward stroke and loads on the upward stroke. In doing so this allows the components of the drive train, including the yoke and gear, to be much lighter as the yoke 30 ends up being more of a guidance device rather than a force- applying device.
• motor and pinion 24 are offset from the centerline 42 of pump assembly 40 which also has offset therefrom bearing 20 in the opposite direction. Also, this arrangement does not have any significant cantilevering as the pump rod, pinion, yoke, eccentric and cap are all located in the same plane.
• the location of the rod and the single acting pump with respect to the gear centerline reduces the thrust loads on the yoke.
• the location of the pinion on the gear partially offsets and reduces the pump forces on the gear shaft and bearings.
• the shaft packing assembly 44 shown in FIG. 4 is comprised of a packing housing 46 which screws into pump housing 48 and which contains a felt member 50 which has been soaked with throat seal lubricant or other solvent or lubricant.
• a stack of v-packings is comprised of a packing housing 46 which screws into pump housing 48 and which contains a felt member 50 which has been soaked with throat seal lubricant or other solvent or lubricant.
• wave spring 54 which is tightened by tightening seal housing 46 into pump housing 48.
• inlet check 56 is provided with a check ball 58, a check seat 60 which is pressed into check housing 62 and which is held in place by retainer and integral ball guide 64. These parts all press-fit into one another such that the complete assembly be merely screwed into main pump housing 48 for replacement.
• outlet check assembly is formed of an outlet check housing 60 which is screwed into pump housing 48 and similarly is provided with a check ball 62 held in place by ball seat 65.
• the outlet passageway 66 is angled relative to the axis of pump shaft 36.
• outlet check assembly 58 This allows the outlet check assembly 58 to operate essentially via gravity and yet requires only the drilling and provision of one passageway while maintaining an essentially vertical ball-seat relationship.
• FIGs. 8 and 9 show the outlet filter assembly 80 which is comprised of a filter element 82 contained in passage 84 of pump assembly 40 and which is retained by fitting 86.
• inlet tube 70 is provided with a female threaded end 70a.
• Inlet filter screen assembly 72 has a male threaded end 72a for threaded engagement with end
• Ends 70a and 72a use the same size and thread as a common garden hose such that a user need merely remove screen assembly 72, attach a garden hose to inlet tube 70, turn on the water and flush out the assembly.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)
• Applications Or Details Of Rotary Compressors (AREA)

Priority Applications (6)

Applications Claiming Priority (4)

Publications (1)

Family

ID=26848977

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (3)

Citations (5)

Family Cites Families (11)

• 2000
  • 2000-08-28 CN CNB008121109A patent/CN1171004C/zh not_active Expired - Lifetime
  • 2000-08-28 ES ES05077480T patent/ES2389607T3/es not_active Expired - Lifetime
  • 2000-08-28 AU AU73348/00A patent/AU7334800A/en not_active Abandoned
  • 2000-08-28 JP JP2001519988A patent/JP4668493B2/ja not_active Expired - Fee Related
  • 2000-08-28 EP EP00961390A patent/EP1208287B1/en not_active Expired - Lifetime
  • 2000-08-28 KR KR1020027002540A patent/KR100668583B1/ko not_active IP Right Cessation
  • 2000-08-28 WO PCT/US2000/023613 patent/WO2001016462A1/en active IP Right Grant
  • 2000-08-28 DE DE60029597T patent/DE60029597T2/de not_active Expired - Lifetime
  • 2000-08-28 EP EP10184231.8A patent/EP2280169B1/en not_active Expired - Lifetime
  • 2000-08-28 US US12/798,490 patent/USRE42706E1/en not_active Expired - Lifetime
  • 2000-08-28 ES ES00961390T patent/ES2269176T3/es not_active Expired - Lifetime
  • 2000-08-28 ES ES10184231T patent/ES2424141T3/es not_active Expired - Lifetime
• 2010
  • 2010-04-30 JP JP2010105055A patent/JP5060587B2/ja not_active Expired - Fee Related

Patent Citations (5)

Non-Patent Citations (1)

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