EP0802832B1 - Soupape d'entree pour admission de pistolet a pulverisation sans air - Google Patents

Soupape d'entree pour admission de pistolet a pulverisation sans air Download PDF

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Publication number
EP0802832B1
EP0802832B1 EP95943761A EP95943761A EP0802832B1 EP 0802832 B1 EP0802832 B1 EP 0802832B1 EP 95943761 A EP95943761 A EP 95943761A EP 95943761 A EP95943761 A EP 95943761A EP 0802832 B1 EP0802832 B1 EP 0802832B1
Authority
EP
European Patent Office
Prior art keywords
paint
valve
inlet
fitting
sprayer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95943761A
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German (de)
English (en)
Other versions
EP0802832A2 (fr
Inventor
Roger Conatser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Campbell Hausfeld LLC
Original Assignee
Campbell Hausfeld Scott Fetzer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/370,159 external-priority patent/US5639219A/en
Application filed by Campbell Hausfeld Scott Fetzer Co filed Critical Campbell Hausfeld Scott Fetzer Co
Priority to EP98111118A priority Critical patent/EP0865829A3/fr
Publication of EP0802832A2 publication Critical patent/EP0802832A2/fr
Application granted granted Critical
Publication of EP0802832B1 publication Critical patent/EP0802832B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04B23/00—Pumping installations or systems
    • F04B23/02—Pumping installations or systems having reservoirs
    • F04B23/025—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir
    • F04B23/028—Pumping installations or systems having reservoirs the pump being located directly adjacent the reservoir the pump being mounted on top of the reservoir
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3006—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being actuated by the pressure of the fluid to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0413—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/043—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump having pump readily separable from container
    • 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
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • F04B11/0025—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring the spring fluid being in direct contact with the pumped fluid
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves
    • F04B53/1032—Spring-actuated disc valves

Definitions

  • This invention relates to airless paint sprayers, and more particularly, to a mechanism for providing a more consistent spray of paint without a loss of pressure over a range of operating parameters.
  • a piston driven diaphragm pulls the paint from a supply line into a paint holding or diaphragm chamber.
  • a spray gun has a trigger which, when depressed, opens a valve to allow the pressurized paint in the chamber to flow to a gun nozzle and atomize as it exits a paint orifice for spraying onto a surface to be coated.
  • FR-A-1405442 describes a spraying apparatus having a reservoir provided near its nozzle to regularise pulses generated by its pump.
  • a damper apparatus is described in US-A-3945767 in which a plurality of upstanding open ended tubes are interposed in an inlet line between a reservoir and a diaphragm pump.
  • US-A-4524947 which represents the prior art as referred to in the preamble of claim 1, relates to a solenoid valve comprising dual springs in a series arrangement.
  • Airless paint sprayers commonly include a suction tube inserted within a can of paint through which the paint is delivered to the diaphragm chamber. Suction is created in the suction tube by a deformable diaphragm which is secured around its perimeter. A central portion of the diaphragm is oscillated, by a piston-driven hydraulic system, for example, between a convex and a concave configuration to thereby pull the paint toward the diaphragm and hence force it outwardly to the spray gun.
  • a rotating eccentric cam drives a bearing which in turn drives a piston.
  • the piston is coupled to the diaphragm and the rotation of the cam drives the piston to thereby move the diaphragm to and between the convex and concave configurations.
  • the paint is drawn from the can through the suction tube and inlet valve toward the diaphragm and into the diaphragm chamber to be discharged through the spray gun.
  • the present invention is directed at an inlet for a diaphragm pump of an airless paint sprayer having a suction tube for supplying paint from a paint source through the pump to a spray nozzle, the inlet comprising a valve biased toward a closed position to prevent paint from flowing through the inlet, paint being permitted to flow through the inlet when the valve is in an open position, a first spring engaging the valve in said closed position and biasing the valve toward said closed position, and a second spring, the first and second springs in combination being adapted to bias the valve toward said closed position with a greater force when in said open position than when in said closed position.
  • the second spring engages and biases the valve toward said closed position only in said open position to enable the valve sufficient travel distance between said open and closed positions to inhibit cavitation of the paint flowing through the valve without diminishing the response time of the valve.
  • a preferred embodiment of the invention contemplates the use of a dampener on the spray liquid or paint intake side of the paint sprayer.
  • One aspect of the invention is the realization of the basic problem which is responsible for inconsistent paint spraying performance.
  • that problem is the inconsistency of the system by which paint is delivered from an open container to the pumping or diaphragm chamber of the spraying apparatus.
  • the suction tube between the inlet check valve of the pumping chamber and the open paint container is vertically oriented and may be 30 to 61 cm (1 to 2 feet) long. Paint is sucked up from the container in this tube, through the inlet check valve and into the pumping chamber. In order to suck the paint past the inlet check valve the diaphragm must create a pressure drop in the chamber and it does so by virtue of its eccentric drive or by the piston-driven hydraulic drive The nature of the diaphragm is cyclical; the diaphragm constantly accelerating and decelerating through each sucking and pumping direction.
  • the diaphragm As the diaphragm is moved to enlarge the chamber for sucking paint up the supply tube, it accelerates due to the eccentric action of the piston. It decelerates as it reaches its maximum stroke and the check valve closes. During this time, the paint in the tube is subjected to a pressure drop which first accelerates then decelerates to near equilibrium when the inlet check valve closes. Thereafter, the diaphragm is accelerated into the chamber to pump out the paint therein. Once this stroke ends, the diaphragm accelerates in a reverse direction to again open the inlet check valve and suck paint up from the tube.
  • the eccentric rotation of the cam drive and the acceleration/deceleration of the rod following the cam create acceleration spikes in the flow of the paint during each cycle.
  • the acceleration spikes correspond to specific points or areas on the drive cam which result in significant acceleration/deceleration of the rod.
  • These acceleration/deceleration forces are transferred from the rod to the diaphragm thereby resulting in acceleration spikes in the flow of the paint drawn into the diaphragm chamber through the inlet check valve and suction tube.
  • the paint is thus being accelerated and decelerated with each stroke of the diaphragm.
  • This invention is based, in part, upon the realization that the force required to accelerate the paint was in many instances greater than the paint itself could support without cavitation or boiling.
  • the paint was cavitating or boiling in the diaphragm chamber in many instances due to the sum of the various forces to which the paint is subjected.
  • Factors which contribute to paint cavitation in such paint sprayers are the ambient temperature and barometric atmospheric pressure (i.e., altitude) at which the sprayer was operated.
  • Other factors which may contribute are the dimensions, configurations and tolerances of the suction tube, and the viscosity of the paint.
  • the inlet check valve spring configuration of this invention also solves a large number of occurrences of paint cavitation and loss of pressure in paint spray, and very often more occurrences than the dampener fitting described below Prior to this invention, only about 10-15% of the maximum paint flow was passing through the paint sprayer due to the cavitation of the paint.
  • a paint sprayer pump capable of operating at a peak flow of about 4.5 litres per minute (lpm) (1.2 gallons per minute (gpm)) was only operating at approximately 0.53 to 0.72 lpm (0.14 to 0.19 gpm) flow.
  • the response time of the valve is the time for the valve to return from an open configuration to a closed position.
  • One way to increase the response time of the valve and maintain a longer travel distance was to increase the return spring preload or spring rate. However, increasing the spring preload or rate adversely effects the vacuum and priming operations of the pump.
  • One way to increase the spring preload is to utilize a spring with a higher spring rate (i.e., a spring which requires more force for the same amount of deflection).
  • a spring with a higher spring rate i.e., a spring which requires more force for the same amount of deflection.
  • sensitivity to valve and component wear increases when utilizing a spring with a sufficiently high spring rate to maintain a sufficient response time for the system while providing increased inlet travel distance to avoid paint cavitation.
  • the inlet check valve spring configuration of the present invention was discovered by taking into consideration the altitude, temperature, and pressure conditions that might occur at any given operating location, and the boiling points of the paints and/or fluids to be pumped. At maximum likely operating elevations, barometric pressures and temperatures, the pressure drop across various components of the airless paint sprayer and the total intake system were used to calculate the maximum pressure drop across the inlet check valve without paint cavitation. For example, in one presently preferred embodiment of an airless paint sprayer, a pressure drop of approximately 24000 Pa (3.5 psi) across the inlet check valve without cavitation is possible with a minimum design pressure of 69000 Pa (10 psi) absolute.
  • the inlet check valve of the present invention includes dual springs which in combination provide for maximum travel of the inlet check valve to avoid cavitation, sufficient response time of the inlet check valve to maintain system performance without increased wear or dimensional variation on the valve components.
  • the inlet check valve spring assembly includes a primary spring having a very low spring rate, approximately 180 N/m (1 lbf/in (one pound force per inch)) in a presently preferred embodiment, and a secondary spring having a much higher spring rate, approximately 1050 N/m (6 lbf/in) in a preferred embodiment.
  • the primary spring is always engaged with the inlet check valve and reduces sensitivity to valve wear and dimensional variation because it has a low spring rate.
  • the secondary spring is disengaged from the valve when not in operation.
  • the dual inlet check valve spring can be used in products currently available with a conventional single spring without detriment to the vacuum or priming operation.
  • the secondary spring permits an increased response time of the valve due to the higher spring rate.
  • the primary spring maintains a low preload during priming operations.
  • the secondary spring provides little, if any, preload during priming operations, but provides the majority if not all of the preload during normal operation.
  • the dual spring of the inlet check valve of this invention avoids the cavitation of the paint and the problems associated therewith in an airless sprayer by permitting greater fluid flow through the inlet check valve.
  • the dual spring facilitates the greater flow without the disadvantages of reduced response time, increased sensitivity to component wear and loss of priming performance.
  • the dampener of one embodiment of the present invention comprises a generally T-shaped fitting connected to the suction tube leading to the inlet check valve of the pump or diaphragm chamber.
  • the T-shaped fitting includes a first leg having a port through which paint is received from the suction tube inserted in the paint can or reservoir and a second leg perpendicular to the first leg through which paint is discharged via a second port to the inlet check valve of the pump.
  • a third leg of the T-fitting comprises a closed chamber which is in line with the first leg and perpendicular to the second leg in a presently preferred embodiment of the invention.
  • Other configurations of the dampener for different sprayer configurations are possible.
  • the dampener described above solves a significant number of occurrences of the problem of pressure loss during the operation of the paint sprayer caused, in part, by acceleration spikes transmitted in the paint. This is initially accomplished with the T-shaped fitting positioned in-line on the suction tube on the intake side of the inlet check valve. The air trapped in one of the legs of the T-fitting dampens the acceleration spikes to thereby even the flow of the paint. While the paint in the discharge or second leg of the T-fitting is still subjected to some of the acceleration spikes and the acceleration/deceleration forces, the volume of paint which remains on the intake side or of the first leg of the T-fitting is isolated from the acceleration spikes.
  • a dampening chamber such as the T-fitting described is operatively connected to the paint supply path upstream of the inlet check valve.
  • the pump On start up, the pump is primed normally, however it will be appreciated a slight negative pressure is created in the dampening chamber.
  • the diaphragm On operation, when the diaphragm is pushed into the pumping chamber and the inlet check valve is closed, the pressure drop on the supply side of the inlet check valve is reduced. The slight negative pressure in the dampening chamber pulls an amount of paint therein.
  • the inlet check valve When the diaphragm starts its reciprocal motion and begins to accelerate, the inlet check valve is open. As the pressure drop increases in magnitude, the suction on the paint supply increases to a peak. However, not only is the paint in the suction tube subjected to this drop, but the paint in the dampening chamber is sufficient to feed the increased paint demand.
  • the intake paint is thus made up not only of paint from the supply can and in the tube above it, but also paint in the dampening chamber.
  • the pressure in the dampening chamber is greater than the pressure in the supply side of the fitting connected to the inlet check valve.
  • the paint at the higher pressure in the dampening chamber feeds the supply side of the fitting during extreme acceleration of the diaphragm.
  • the acceleration spikes applied to the supply side paint are reduced and are not excessive enough to cause the paint to cavitate and incompletely fill the pumping chamber.
  • the pumping chamber is full and design pressure drop at the spray orifice is maintained sufficiently to support consistent atomization and paint spray performance.
  • closure of the inlet check valve allowed the now slight negative pressure in the dampening chamber to suck up a small amount of make-up paint from the suction tube in readiness for another dampening cycle.
  • dampener described above thus solves a significant number of the problems identified hereinabove with airless diaphragm paint sprayers. With the inclusion of the dampener, the even flow of the paint from the tube to the spray gun without cavitation, loss of pressure, or other problems associated with airless diaphragm paint sprayers is attained.
  • the dampener and inlet check valve spring configuration of this invention solve most, if not all, the problems identified hereinabove with airless diaphragm paint sprayers.
  • the even flow of the paint from the tube to the spray gun without cavitation, loss of pressure, or other problems associated with airless diaphragm paint sprayers is attained.
  • An airless paint sprayer 10 as shown in Fig. 1 includes a mobile hand cart 12 supported on the ground by wheels 14 mounted upon an axle 16 for rotation.
  • the hand cart 12 includes a frame 18 to support a pump 20 and a motor 22 which draws paint from a can 24 or other receptacle mounted on a generally L-shaped carriage 26 secured to a lower portion of the frame 18.
  • the paint sprayer 10 can be moved about by grasping an upper generally U-shaped handle 28 and tilting the unit backwards to thereby raise the carriage 26 and paint can 24 supported thereon upwardly to balance the sprayer 10 upon the wheels 14.
  • Other structure of carrying the pump and motor 20, 22 and for supporting them over a paint container or spray liquid container can be used.
  • the paint is drawn from the can 24 through a generally cup-shaped intake 30 having a plurality of cut-outs 32 through which the paint enters the intake 30 supported on a bottom wall of the can 24.
  • the paint is drawn from the can 24 through the intake 30 and into a suction tube 34.
  • the paint flows through the suction tube 34 and into the pump 20 for pressurized delivery to a supply line 35 and spray gun 37 through which the pressurized paint is sprayed out of the spray gun in the direction of a surface to be coated.
  • the route of the paint from the can 24 through the pump 20 is identified as a paint path P in Fig. 2.
  • the T-shaped fitting 36 in one embodiment includes a first leg 38 which is inserted into the upper end of the suction tube 34 as shown in Fig. 2 and a first port 40 through which the paint is drawn from the suction tube 34.
  • a second leg 42 of the T-shaped fitting 36 is generally perpendicular to the first leg 38 and includes a second port 44 through which the paint exits the fitting 36.
  • a third leg 46 Perpendicular to the second leg 42 and generally in line with the first leg 38 of the fitting 36 is a third leg 46 which extends upwardly and includes a third port 48.
  • the third port 48 is closed by a cap 50 which is secured on an upper end of the third leg 46 by inter-engaging threads on the cap 50 and an outer surface of the third leg 46 or another appropriate fastening mechanism.
  • the cap 50 secured to the third leg 46 closes the third port 48 and defines a volume or dampening chamber 52 within the third leg 46.
  • the first leg 38 is approximately 25 mm (one inch) in length and the first port 40 has an inner diameter of about 12 mm (0.48 inches).
  • the second leg 42 is approximately 53 mm (2.1 inches) in length as measured from the centerline of the first leg 38 and the second port 44 has an inner diameter of 20 mm (0.78 inches).
  • the third leg 46 is approximately 53 mm (2.1 inches) in length as measured from the centerline of the second leg 42 and the third port 48 has an inner diameter of approximately 23 mm (0.9 inches).
  • the T-shaped fitting 36 is preferably manufactured from 10% glass-filled nylon.
  • the second leg 42 of the T-shaped fitting 36 is connected to an inlet valve cartridge 54 by a coupling 56 or other appropriate mechanism as known in the art.
  • the inlet valve cartridge 54 is mounted to a pump housing 58 of the pump 20.
  • the housing 58 is secured to the pump 20 as shown in Fig. 2 by bolts 60 or other mechanical fasteners.
  • Seated within an end of the inlet valve cartridge 54 and mounted in the housing 58 is an inlet check valve assembly 62 which includes an elongated valve stem 64 projecting axially within the inlet valve cartridge 54, and having a disk-shaped valve head 66 secured on one end opposite from another end 68 thereof.
  • the inlet check valve assembly 62 translates between open and closed positions to permit the flow of paint through the inlet valve cartridge 54 to the hose 35 and spray gun upon actuation by a trigger 39 or other appropriate mechanism as is well known by those of ordinary skill in the art.
  • the valve head 66 is positioned proximate a diaphragm chamber or pumping chamber 70 and is spaced from a deformable diaphragm 72.
  • the diaphragm 72 is secured around its perimeter so that a central portion of the diaphragm 72 can oscillate between convex and concave configurations. As it is pulled to the left as viewed in Fig. 2, it pulls the paint through the inlet valve cartridge 54 and the open inlet check valve assembly 62 toward the diaphragm 72. As it moves to the right, it pressurizes chamber 70 and pumps paint through an outlet 73 having a check valve 75 and to the spray tube 35 and spray gun 37.
  • the deformable diaphragm 72 has a stem 74 secured to a central portion 76. The stem 74 is driven indirectly from a piston and eccentric cam (not shown) as is well known in airless paint sprayers of the type described above.
  • the inlet check valve assembly 62 is biased to a closed position in which the valve head 66 is in sealing contact with a surface 78 of an annular seat 81.
  • the seat 81 is juxtaposed to a limiter 80.
  • the inlet check valve assembly 62 is shown in Figs. 2 and 3 in the closed position with the valve head 66 in contact with the surface 78 of the seat 81.
  • the valve stem 64 projects through a hole 82 in the center of the limiter 80.
  • the valve 62 is biased toward the closed position by a pair of nested helical compression springs 84, 86.
  • the outer, primary spring 84 is mounted between the limiter 80 and an opposing retainer 88.
  • the end coils of the primary spring 84 are seated on flanges 92 on the retainer 88 and on the limiter 80 as shown in Fig. 3.
  • the retainer 88 is juxtaposed to an annular push-on retainer 94 proximate the end 68 of the valve stem 64.
  • the primary spring 84 is preloaded to a partially compressed configuration thereby urging the retainer 88 and the limiter 80 apart and basing the valve stem 64 into a closed configuration with the valve head 66 in sealing contact with the surface 78 on the seat 80.
  • the secondary spring 86 is nested within the primary spring 84 and around the valve stem 64.
  • the secondary spring 86 is seated within sockets 96 formed within the centers of the retainer 88 and the limiter 80 as shown in Fig. 3.
  • the secondary spring is offset within the sockets 96 from either or both of the retainer 88 and the limiter 80 so that it is not compressed while the valve stem 64 is in the closed configuration.
  • the primary spring 84 has a relatively low spring rate and the secondary spring 86 has a significantly larger spring rate.
  • the primary spring 84 has a rate of approximately 180 N/m (1 lbf/in) and the secondary spring 86 has a rate of 1050 N/m (6 lbf/in).
  • the primary spring 84 maintains engagement with both the retainer 88 and the limiter 80 and thereby remains in at least a partially compressed configuration.
  • the relatively low spring rate of the primary spring 84 reduces sensitivity to valve wear and dimensional variation of the inlet check valve assembly 62 components.
  • the inlet check valve assembly 62 according to this invention can be used in many standard airless paint sprayers without detriment to the system, vacuum or priming operations.
  • the deformable diaphragm 72 operates to draw paint into the diaphragm chamber 70 with the inlet check valve assembly 62 open and the head 66 spaced from the surface 78 of the limiter 80.
  • the primary and secondary springs 84, 86 are compressed and the retainer 88 and the limiter 80 are drawn closer together as a result of the travel or movement of the valve stem 64 so that the valve head 66 is spaced from the surface 78.
  • the primary and secondary springs 84, 86 of the inlet check valve assembly 62 enable the valve travel distance to be increased relative to known single spring inlet check valve assemblies.
  • the increased travel of the valve head 66 enables greater fluid flow through the valve 62 without cavitation or boiling of the paint over a wide range of operating conditions, barometric pressures, ambient temperatures, and altitudes.
  • the maximum fluid flow that can be achieved was raised from about 0.53-0.71 lpm (0.14-0.19 gpm) to 3.22-4.31 lpm (0.85-1.14 gpm) with the increased travel distance of the valve and the dual spring assembly. This increased allowable fluid flow was achieved due to the increased travel distance of the valve.
  • the response time refers to the elapsed time for the inlet check valve 62 to move between opened and closed positions.
  • the inlet check valve 62 should have a response faster than 30 Hz in one preferred embodiment of the airless paint sprayer 10 according to this invention.
  • the dual spring inlet check valve assembly 62 maintains a relatively low preload upon the valve stem 64 in the closed configuration and while priming the system and a much higher load when the valve 62 is in the open position.
  • the optimum combined spring preload for the inlet check valve assembly 62 with a maximum inlet check valve head 66 travel distance is approximately 0.38 kg (0.83 pounds). This value will change based upon valve size, component geometry, maximum travel distance, and other paint sprayer parameters.
  • the optimum preload force upon the valve in the closed position is approximately 0.059 kg (0.13 pounds).
  • the travel distance of the valve head 66 can be increased to thereby allow greater fluid flow through the inlet check valve 62 without cavitation of the paint while still maintaining an appropriate response time for the inlet check valve and minimizing the detrimental effects of component wear, diminished priming and vacuum performance of the system.
  • the T-shaped fitting 36 contributes to reducing cavitation in the paint by dampening the acceleration spikes transmitted in the fluid from the deformable diaphragm 72.
  • the paint level in the third leg 46 of the T-shaped fitting 36 is indicated by reference numeral 98.
  • the chamber 52 in the third leg 46 contains a trapped volume of air, preferably at a partial vacuum of greater then about 3390 Pa (1.0 in-Hg) and approximately 10200 Pa (3.0 in-Hg) in one preferred embodiment.
  • the air trapped within the chamber 52 in the third leg 46 of the T-shaped fitting 36 dampens the acceleration spikes being transmitted from the diaphragm 72 through the paint in the inlet valve cartridge 54 and second leg 42 of the T-shaped fitting 36 to thereby even the flow of the paint. While the paint in the discharge or second leg 42 of the T-shaped fitting 36 may be subjected to some of the acceleration spikes and acceleration/deceleration forces generated by the deformable diaphragm 72, the volume of paint which remains on the Intake side of the T-shaped fitting 36 or the first leg 38 is isolated from the acceleration spikes.
  • the volume of paint within the chamber 52 in the third leg 46 is drawn into the second leg 42 along with paint from the suction tube 34 and first leg 38 while the inlet check valve 62 is open and drawing paint therethrough.
  • the added supply of paint from the chamber 52 overcomes the acceleration spikes and inhibits cavitation in the paint path P. Therefore, the paint does not cavitate, boil, or breakdown thereby avoiding a significant number of occurrences of pressure loss in the paint sprayer 10 and other problems previously associated with airless diaphragm paint sprayers.
  • dampener and dual spring inlet check valve assemblies are shown and described herein, that the valve assembly can be used alone to inhibit paint cavitation in the paint path of the airless sprayer. Nevertheless, use of the dampener and dual spring inlet check valve in combination provide greater advantages by avoiding more of the problems of cavitation than use of the valve individually.
  • the invention has been shown and described herein with reference to a paint sprayer, but could readily be used in other systems.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Reciprocating Pumps (AREA)
  • Catching Or Destruction (AREA)
  • Closures For Containers (AREA)
  • Spray Control Apparatus (AREA)
  • Compressor (AREA)

Claims (14)

  1. Dispositif d'aspiration pour pompe à membrane (20) d'un pulvérisateur de peinture sans air (10) ayant un tube d'aspiration (34) pour fournir la peinture d'une source de peinture à travers la pompe à une buse de pulvérisation, le dispositif d'aspiration comprenant un clapet (62) rappelé vers une position fermée pour empêcher la peinture de passer par le dispositif d'aspiration, la peinture pouvant passer par le dispositif d'aspiration lorsque le clapet est en position ouverte, un premier ressort (84) engageant le clapet (62) dans ladite position fermée et rappelant le clapet vers ladite position fermée, et un deuxième ressort (86), les premier et deuxième ressorts (84, 86) en combinaison étant adaptés pour rappeler le clapet (62) vers ladite position fermée avec une plus grande force lorsqu'il est dans ladite position ouverte que quand il est dans ladite position fermée, caractérisé en ce que le deuxième ressort (86) engage et rappelle le clapet vers ladite position fermée seulement dans ladite position ouverte pour procurer au clapet (62) une course suffisante entre lesdites positions ouverte et fermée pour empêcher la cavitation de la peinture passant par le clapet (62) sans diminuer le temps de réponse du clapet.
  2. Dispositif d'aspiration selon la Revendication 1 dans lequel le deuxième ressort (86) a un tarage supérieur à celui du premier ressort (84).
  3. Dispositif d'aspiration selon la Revendication 1 ou la Revendication 2 dans lequel les premier et deuxième ressorts (84, 86) sont chacun des ressorts de compression spiralés.
  4. Dispositif d'aspiration selon la Revendication 3 dans lequel le deuxième ressort (86) est emboíté à l'intérieur du premier ressort (84) et les premier et deuxième ressorts ont un axe commun.
  5. Dispositif d'aspiration selon l'une quelconque des revendications précédentes dans lequel le premier ressort (84) engage le clapet (62) dans lesdites positions ouverte et fermée et des positions intermédiaires entre lesdites positions ouverte et fermée.
  6. Pulvérisateur (10) pour pulvériser un fluide contenu dans un récipient (24) comprenant un tube d'aspiration (34) ayant une première extrémité insérée dans le fluide contenu dans ledit récipient, un raccord (36) ayant des premier et deuxième orifices (40, 44) et une chambre d'amortissement (52), le premier orifice (40) étant fonctionnellement relié à une deuxième extrémité du tube d'aspiration, le fluide circulant dudit récipient (24) à travers le tube d'aspiration (34) et dans le raccord (36) étant déchargé à travers son deuxième orifice (44), la chambre (52) étant interconnectée avec les premier et deuxième orifices (40, 44) et étant positionnée à proximité d'une intersection des premier et deuxième orifices, un dispositif d'aspiration de l'une quelconque des revendications précédentes étant relié fonctionnellement au deuxième orifice (44) du raccord (36) et situé en aval dudit deuxième orifice, une pompe à membrane (20) reliée fonctionnellement au clapet d'aspiration (62) et située en aval dudit clapet, et une buse reliée fonctionnellement à la pompe (20) de telle sorte que, pendant le fonctionnement du pulvérisateur (10), la pompe aspire le fluide contenu dans ledit récipient (24) à travers le tube d'aspiration (34) et le raccord (36) et pompe le fluide vers la buse pour la pulvérisation, un volume d'air étant contenu dans la chambre (52) du raccord (36) pour inhiber la cavitation du fluide circulant du récipient (24) à travers le raccord (36) et vers la pompe (20).
  7. Pompe à membrane à liquide sans air (20) comprenant une chambre de pompage (70), un dispositif d'aspiration selon l'une quelconque des Revendications 1 à 5, un chemin d'alimentation en liquide relié fonctionnellement au clapet d'aspiration (62) et à une première alimentation (24) en liquide à la pression ambiante, et une deuxième alimentation (52) en liquide reliée fonctionnellement au chemin d'alimentation en amont du clapet d'aspiration (62) et exposée à une pression inférieure à la pression ambiante et supérieure à la chute de pression appliquée à la première alimentation (24) en liquide dans le chemin pendant une accélération de pointe de la chute de pression du cycle d'aspiration de la pompe (20) de telle sorte que le liquide de la deuxième alimentation (52) circule dans le chemin d'aspiration pendant au moins une partie du temps où le clapet d'aspiration (62) est ouvert.
  8. Pulvérisateur sans air (10) comprenant une pompe à membrane (20) ayant une chambre de pompage (70), un dispositif d'aspiration selon l'une quelconque des Revendications 1 à 5, et un chemin d'aspiration de liquide de pulvérisation relié fonctionnellement entre la pompe et une alimentation (24) de liquide de pulvérisation, le pulvérisateur (10) comprenant une chambre d'amortissement (52) reliée fonctionnellement au chemin d'aspiration pour amortir les chutes de pression appliquées au liquide de pulvérisation circulant dans le chemin.
  9. Pulvérisateur (10) selon la Revendication 8 comprenant un tube d'aspiration (34) ayant une première extrémité introduite dans une alimentation en liquide de pulvérisation à l'intérieur d'un récipient (24), la chambre d'amortissement (52) étant définie par un raccord (36) ayant des premier et deuxième orifices (40, 44), le premier orifice (40) étant relié fonctionnellement à une deuxième extrémité du tube d'aspiration (34), le fluide circulant du récipient (24) à travers le tube d'aspiration et dans le raccord (36) étant déchargé à travers le deuxième orifice (44) de celui-ci, la chambre (52) étant interconnectée avec les premier et deuxième orifices (40, 44) et étant positionnée à proximité d'une intersection des premier et deuxième orifices, un tube d'aspiration (54) ayant une première extrémité reliée fonctionnellement au raccord (36), la pompe (20) étant reliée fonctionnellement à une deuxième extrémité du tube d'aspiration (54), et une buse reliée fonctionnellement à la pompe (20) de telle sorte que, pendant le fonctionnement du pulvérisateur (10), la pompe aspire le liquide de pulvérisation du récipient (24) à travers le tube d'aspiration (34) et le raccord (36) et pompe le liquide de pulvérisation vers la buse pour la pulvérisation, un volume d'air étant contenu dans la chambre d'amortissement (52) du raccord (36) pour inhiber la cavitation du liquide de pulvérisation circulant du récipient (24) à travers le raccord (36) et à la pompe (20).
  10. Pulvérisateur (10) selon la Revendication 9 dans lequel un axe du deuxième orifice (44) du raccord (36) est généralement colinéaire avec un axe du clapet d'aspiration (62).
  11. Pulvérisateur selon les Revendications 8 à 10 dans lequel la chambre d'amortissement (52) est adaptée pour maintenir un volume d'air à une pression suffisante pour aspirer le liquide de pulvérisation dans la chambre d'amortissement quand le clapet d'aspiration (62) est fermé, et pour permettre au liquide de pulvérisation qui s'y trouve de circuler vers le clapet d'aspiration lorsque le clapet d'aspiration est ouvert.
  12. Pulvérisateur (10) selon l'une quelconque des Revendications 6, 9, 10 ou la Revendication 11 sous sa forme subordonnée à la Revendication 9, où le raccord (36) est en forme de T, une première branche (38) du raccord en T comprenant le premier orifice (40), une deuxième branche (42) du raccord en T comprenant le deuxième orifice (44), et une troisième branche (46) du raccord en T comprenant la chambre (52), les première et troisième branches (38, 46) étant généralement colinéaires et la deuxième branche (42) étant généralement perpendiculaire aux première et troisième branches.
  13. Pulvérisateur (10) selon l'une quelconque des Revendications 6 ou 8 à 12, dans lequel le volume d'air contenu dans la chambre d'amortissement (52) est à une dépression supérieure à environ 3390 Pa (1 pouces de mercure).
  14. Pulvérisateur (10) selon la Revendication 13 dans lequel le volume d'air est à une dépression d'environ 10160 Pa (3 pouces de mercure).
EP95943761A 1995-01-09 1995-12-13 Soupape d'entree pour admission de pistolet a pulverisation sans air Expired - Lifetime EP0802832B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98111118A EP0865829A3 (fr) 1995-01-09 1995-12-13 Amortisseur pour admission de pistolet à pulvérisation

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US37037795A 1995-01-09 1995-01-09
US08/370,159 US5639219A (en) 1995-01-09 1995-01-09 Airless paint sprayer intake dampener and inlet valve spring
US370159 1995-01-09
US370377 1995-01-09
PCT/US1995/016141 WO1996021519A2 (fr) 1995-01-09 1995-12-13 Amortisseur pour admission de pistolet a pulverisation sans air et ressort pour soupape d'entree

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP98111118A Division EP0865829A3 (fr) 1995-01-09 1995-12-13 Amortisseur pour admission de pistolet à pulvérisation

Publications (2)

Publication Number Publication Date
EP0802832A2 EP0802832A2 (fr) 1997-10-29
EP0802832B1 true EP0802832B1 (fr) 1999-06-09

Family

ID=27004843

Family Applications (2)

Application Number Title Priority Date Filing Date
EP95943761A Expired - Lifetime EP0802832B1 (fr) 1995-01-09 1995-12-13 Soupape d'entree pour admission de pistolet a pulverisation sans air
EP98111118A Withdrawn EP0865829A3 (fr) 1995-01-09 1995-12-13 Amortisseur pour admission de pistolet à pulvérisation

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP98111118A Withdrawn EP0865829A3 (fr) 1995-01-09 1995-12-13 Amortisseur pour admission de pistolet à pulvérisation

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Country Link
EP (2) EP0802832B1 (fr)
JP (1) JP3233409B2 (fr)
AT (1) ATE180993T1 (fr)
AU (2) AU693639B2 (fr)
BR (1) BR9510190A (fr)
CA (1) CA2208116C (fr)
DE (1) DE69510231T2 (fr)
FI (1) FI113017B (fr)
HU (1) HU221565B (fr)
NO (1) NO973105L (fr)
NZ (1) NZ300419A (fr)
PL (1) PL179315B1 (fr)
WO (1) WO1996021519A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5534796B2 (ja) * 2009-12-15 2014-07-02 キヤノン株式会社 電子写真感光体の製造方法
US9162866B2 (en) 2010-06-24 2015-10-20 Graco Minnesota Inc. Dual pump fluid proportioner with adjustable motor position
US20160023427A1 (en) * 2012-05-29 2016-01-28 Niles Nanofabrix Nanomaterial based fabric reinforced with prepreg methods, and composite articles formed therefrom

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US2100404A (en) * 1932-08-16 1937-11-30 Bell Telephone Labor Inc Fluid transmission
US2290788A (en) * 1939-07-10 1942-07-21 Wilson John Hart Slush pump
FR1405442A (fr) 1964-05-30 1965-07-09 Perfectionnements aux appareils de distribution de liquides
US3447564A (en) * 1967-05-31 1969-06-03 Brunswick Corp Leakproof valve
SE368266B (fr) * 1969-12-16 1974-06-24 Danfoss As
US3675849A (en) * 1970-04-06 1972-07-11 Mcneil Corp In-plant cleaning system
US3945767A (en) 1973-09-21 1976-03-23 Desoto, Inc. Damper apparatus
US4221437A (en) * 1977-05-06 1980-09-09 Kelsey Hayes Co. Brake proportioning apparatus
US4524947A (en) 1982-11-30 1985-06-25 The Cessna Aircraft Company Proportional solenoid valve
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FR2638812A1 (fr) * 1988-11-04 1990-05-11 Boisseau Rene Dispositif d'amortissement de pulsations de fluide pompe
US4896548A (en) * 1988-12-27 1990-01-30 Gilian Instrument Corp. Fluid sampler with miniature single-acting pump assembly
GB9304486D0 (en) * 1993-03-05 1993-04-21 Lucas Ind Plc Fuel injection nozzle

Also Published As

Publication number Publication date
ATE180993T1 (de) 1999-06-15
JPH10512186A (ja) 1998-11-24
EP0865829A2 (fr) 1998-09-23
WO1996021519A2 (fr) 1996-07-18
FI972904A7 (fi) 1997-07-08
HUT77145A (hu) 1998-03-02
NO973105D0 (no) 1997-07-03
EP0865829A3 (fr) 1998-12-02
AU693639B2 (en) 1998-07-02
AU700478B2 (en) 1999-01-07
NZ300419A (en) 1999-07-29
CA2208116A1 (fr) 1996-07-18
EP0802832A2 (fr) 1997-10-29
DE69510231D1 (de) 1999-07-15
AU6706198A (en) 1998-07-16
CA2208116C (fr) 2002-07-02
AU4515596A (en) 1996-07-31
FI972904A0 (fi) 1997-07-08
PL321137A1 (en) 1997-11-24
BR9510190A (pt) 1997-12-23
HU221565B (hu) 2002-11-28
JP3233409B2 (ja) 2001-11-26
MX9705080A (es) 1997-10-31
NO973105L (no) 1997-07-03
FI113017B (fi) 2004-02-27
DE69510231T2 (de) 1999-12-02
PL179315B1 (pl) 2000-08-31
WO1996021519A3 (fr) 1996-10-31

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