EP1437178A2 - Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung - Google Patents
Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung Download PDFInfo
- Publication number
- EP1437178A2 EP1437178A2 EP03014661A EP03014661A EP1437178A2 EP 1437178 A2 EP1437178 A2 EP 1437178A2 EP 03014661 A EP03014661 A EP 03014661A EP 03014661 A EP03014661 A EP 03014661A EP 1437178 A2 EP1437178 A2 EP 1437178A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- predetermined
- time
- pump
- compressed gas
- 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.)
- Granted
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1459—Arrangements for supplying particulate material comprising a chamber, inlet and outlet valves upstream and downstream the chamber and means for alternately sucking particulate material into and removing particulate material from the chamber through the valves
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- 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
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- 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
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/06—Pumps having fluid drive
- F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
- F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel
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- 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
- F04B53/1037—Flap valves
- F04B53/1047—Flap valves the valve being formed by one or more flexible elements
- F04B53/1057—Flap valves the valve being formed by one or more flexible elements the valve being a tube, e.g. normally closed at one end
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- 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
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
- F04B9/131—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members
- F04B9/133—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor
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- 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
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
- F04B9/129—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers
- F04B9/137—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1372—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions is obtained by a double-acting piston fluid motor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
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- 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
- F04B2201/00—Pump parameters
- F04B2201/02—Piston parameters
- F04B2201/0201—Position of the piston
-
- 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
- F04B2203/00—Motor parameters
- F04B2203/09—Motor parameters of linear hydraulic motors
- F04B2203/0903—Position of the driving piston
-
- 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
- F04B2207/00—External parameters
- F04B2207/04—Settings
- F04B2207/043—Settings of time
Definitions
- the invention relates to a pump device for powder, in particular for Coating powder according to the preamble of claim 1, a method therefor and a powder coating device, the at least one Has pump device.
- the invention relates to a pump device for powder, in particular for coating powder, containing at least one powder pump, which a Dosing chamber having a chamber housing and a Is displacer limited, which relative to the chamber housing during a Druckhubes before and during a suction stroke can be moved back, the Pump chamber a powder inlet channel, which is a powder inlet valve is assigned a powder outlet channel, which a powder outlet valve is assigned, and a compressed gas inlet channel, which a Compressed gas inlet valve is assigned, one for suction dosed amount of powder into the dosing chamber the powder inlet valve is openable and the powder outlet valve and the compressed gas inlet valve are closable, so that the displacer moving in the suction stroke direction Can suck powder through the powder inlet channel into the dosing chamber, and to Convey the metered amount of powder from the metering chamber Powder inlet valve is closable and the powder outlet valve and that Compressed gas inlet valve are openable, so that from the compressed air in
- a pump device of this type is known from EP-A-0 124 933. Pump devices are also known from EP-A-1 106 547, DE-A-39 00 718, DE-A-1 087 520, US 2,667,280, US 3,391,963.
- a pump device is known from practice which has two pumps, each with a powder suction piston and a pneumatic cylinder driving it exhibit.
- the two pumps are driven in opposite directions, so that one makes one suction stroke while the other makes a pressure stroke.
- the powder suction piston in question sucks powder from one Powder source in its dosing chamber.
- At the end of the suction stroke means Compressed air, which is introduced into the dosing chamber, which dosed there Powder quantity from the dosing chamber into a powder discharge line. pushed out.
- the piston then returns to its starting position during a pressure stroke back to powder again from the powder source during a suction stroke to suck.
- the delivery rate per unit of time depends on the frequency with which the pistons are moved back and forth.
- a pump device of this type is in WO 03/024612 A1 only after the priority date of the present new one Patent application has been described.
- injectors are also known, in which according to the Venturi principle a flow of conveying air flows from an outlet nozzle into a collecting nozzle and in Intermediate space creates a negative pressure, through which Coating powder is sucked into the conveying air stream from a powder source.
- Such injectors have compared to the aforementioned piston pumps Disadvantages that the powder particles have an abrasive effect on the catch nozzle and as a result the efficiency of the powder delivery drops over time: one pneumatic powder conveyance of this type requires a large amount of compressed air per Time unit.
- the aforementioned piston pumps do not have these disadvantages.
- the piston pumps have the disadvantage, however, that they convey the powder discontinuously in batches and both for more even powder delivery and for the promotion of larger powder quantities per unit of time a fast piston movement frequency is required.
- the level of the piston frequency is however due to the Control speed with which the valves in the flow paths of the Pump can be controlled, limited. It must also be ensured that in Pump particles and in their flow paths do not crush powder particles will, sinter or otherwise stick and that neither Spaces, depressions and the like exist in which powder can accumulate.
- the object of the invention is to achieve a pump device, which has at least one volume displacement body, that a defined and, if desired, large flow rate of powder per Unit of time is eligible without the aforementioned disadvantages.
- a large one should last over a long service life Process reliability and great stability of the powder delivery rate per unit of time (constant powder rate for a defined configuration and defined setting of the Pump device) can be achieved.
- the pump device is thereby characterized in that a time control device is provided by which in Dependence on the past since a predetermined operating situation predetermined delay period of conveying the powder from the Dosing chamber is started by admitting compressed air into the dosing chamber and the amount of powder dosed by the end of the delay period by means of the Compressed air is pressed out of the dosing chamber.
- a powder spray coating device given which has at least one such pump device.
- the invention also discloses methods for conveying powder, especially coating powder.
- Fig. 1 shows a pump device according to the invention for powder, in particular for coating powder, which has two powder pumps 2-1 and 2-2, which each contain a dosing chamber 4-1 or 4-2, which is from a chamber housing 6-1 or 6-2 and a displacer in the form of a flexible membrane 8-1 or 8-2 is limited.
- the two membranes 8-1 and 8-2 have one arranged between them, common drive 10.
- the drive 10 can be a mechanical, hydraulic, electrical or a pneumatic drive according to FIG. 1.
- the one in Fig. 1 Pneumatic drive shown contains a diagonally to the membranes 8-1 and 8-2 displaceable drive piston 12, of which extends in the direction of movement Piston rods 14-1 or 14-2 extend away from the drive piston 12 distal ends with one membrane 8-1 or with the other membrane 8-2 are connected so that the two membranes are each together with the Move the drive piston 12.
- the piston rods 14-1 and 14-2 each engage in Center of the relevant membrane 8-1 or 8-2, which are each together with the drive piston 12 moved in the piston axial direction.
- Diaphragm peripheral edges 16-1 and 16-2 are each on a part of the Chamber housing 6-1 or 6-2 attached and can not with the Membrane center together with the drive piston 12 across the membrane move. If in the context of this description of lifting movements Membrane, then it means the area of the membrane, which is connected to the drive piston 12 for common movement, but not the peripheral membrane edges 16-1 attached to the chamber housing or 16-2.
- the chamber housings 6-1 and 6-2 of the two powder pumps 2-1 and 2-2 are preferably sections of a common housing part or housing, which is shown in section in Fig. 1.
- the membranes 8-1 and 8-2 are during a pressure stroke before and during a suction stroke movable back by means of the common drive 10.
- Fig. 1 is the membrane 8-1 shown on the left in an end position "a", which represents the end position of the Pressure stroke and the initial position of the suction stroke.
- the associated Dosing chamber 4-1 its smallest volume.
- the membrane is 8-1 preferably not completely on the chamber housing 6-1, but has one small distance from it so that between the membrane 8-1 and the Chamber housing 6-1 powder particles can not be squeezed.
- Fig. 1 shows the right membrane 8-2 in a left end position "c", which is their end position of the suction stroke and their Initial position of the pressure stroke is.
- the two membranes 8-1 and 8-2 are moved to the left or to the right by the drive piston 12, so that the left diaphragm 8-1 performs its pressure stroke when the right diaphragm 8-2 performs its suction stroke, and vice versa.
- the drive piston 12 is located in a cylinder 22 which is close to Cylinder end walls 24 and 25 have a compressed air control opening on both sides of the drive piston 12 26 or 28, which alternately with a changeover valve 30 a compressed air source 32 or with a vent opening 34 to the outside atmosphere are connectable for ventilation.
- a compressed air control opening shown on the right 28 connected to the compressed air source 32, which is why its compressed air has pressed the drive piston 12 into the position shown on the left in FIG. 1 while the compressed air control opening 26 shown on the left with the vent opening 34 of the Switch valve 30 is connected.
- the switching valve 30 is switchable, so that after switching the compressed air control opening 28 shown on the right with the Vent opening 34 is connected and the compressed air control opening shown on the left 26 is connected to the compressed air source 32.
- Reverse position of the switching valve 30 drives the compressed air Drive piston 12 together with the two membranes 8-1 and 8-2 from the left to the right.
- This is through the left membrane 8-1 of their Suction stroke start position (pressure stroke end position) "a” to its suction stroke end position (Print stroke start position) "b” moved.
- the right membrane 8-2 from their suction stroke end position (pressure stroke start position) "c” to their Suction stroke start position (pressure stroke end position) "d” moved.
- the two Membranes 8-1 and 8-2 are in their left end position by a solid line Line and in its right end position schematically by a dashed line shown.
- Each dosing chamber 4-1 and 4-2 has a powder inlet channel 36-1 and 36-2, which one each. Powder inlet valve 38-1 or 38-2 is assigned; one Powder outlet channel 40-1 or 40-2, which each have a powder outlet valve 42-1 or 42-2 is assigned; and a compressed gas inlet channel 44-1 or 44-2, which each a compressed gas inlet valve 46-1 or 46-2 is assigned.
- the left powder inlet valve 38-1 can be opened, and the left Powder outlet valve 42-1 and the left compressed gas inlet valve 46-1 can be closed, see above that the suction stroke direction from the suction stroke start position "a" in the Suction stroke end position "b" moving left membrane 8-1 powder through the left Powder inlet channel 36-1 can suck into the left-hand metering chamber 4-1.
- the left powder inlet valve 38-1 is closable and that left powder outlet valve 42-1 and the left compressed gas inlet valve 46-1 openable so that pressurized gas, e.g. B. compressed air, from a compressed gas source 45-1, z. B. a compressed air source, through the left compressed gas inlet channel 44-1 into the left Dosing chamber 4-1 and the metered amount of powder flow from the dosing chamber 4-1 into the left powder outlet channel 40-1.
- pressurized gas e.g. B. compressed air
- the left membrane 8-1 of the Drive piston 12 again from the right suction stroke end "b" into the left Suction stroke start position "a” moved back, which is referred to here as a pressure stroke, so that she can then perform a suction stroke again.
- Corresponding functions also lead the one driven by the drive 10 1 membrane 8-2 shown on the right and the associated valves 38-2, 42-2, 45-2 and 46-2 out with respect to the associated right-hand metering chamber 4-2 associated right powder inlet channel 36-2 and the associated right Powder outlet channel 40-2 and a compressed gas source 45-2 shown on the right, e.g. B. a compressed air source.
- the right diaphragm 8-2 makes its pressure stroke when the left membrane 8-1 makes its suction stroke, and vice versa.
- the two powder inlet valves 38-1 and 38-2 each have a valve body 38-3 and a valve seat 38-4 with a valve opening extending from the valve body 38-3 is lockable.
- the two powder outlet valves 42-1 and 42-2 each have one Valve body 42-3 and a valve seat 42-4 with a valve opening by the Valve body 42-3 is closable.
- the two powder outlet channels 40-1 and 40-2 shown in FIG. 1 have one common powder discharge opening 48, to which a powder discharge line 50 a powder receiver is connected, for example a powder spraying device 52 for spraying the powder 54 onto an object to be coated or a Intermediate powder container, of which then the powder 54 one Powder spray device 52 is supplied, or a powder collection container.
- a powder discharge line 50 a powder receiver is connected, for example a powder spraying device 52 for spraying the powder 54 onto an object to be coated or a Intermediate powder container, of which then the powder 54 one Powder spray device 52 is supplied, or a powder collection container.
- the two powder inlet channels 36-1 and 36-2 can be connected separately or together a common or connected to different powder sources. In Fig. 2 they are preferably via a common powder inlet opening 56 and a powder suction line 58 connected to a color changer 60.
- the Color changer 60 is a channel switch or powder switch, through which depending Setting the course of one of several powder containers 62, 63, 64 etc. with the Powder suction line 58 is optionally connectable. Switching the Color changer 60 is preferably carried out using compressed gas, e.g. B. compressed air, one Pressurized gas source, e.g. B. a compressed air source 66 via a controlled Valve arrangement 67.
- the color changer 60 can also be switched into a switch position in which none the powder container 62, 63, 64, but instead the compressed gas source 66 a compressed gas line 69 is connected to the powder suction line 58, so that Compressed gas, e.g. B. compressed air via the powder inlet channels 36-1, 36-2 and their Powder inlet valves 38-1, 38-2 through the metering chambers 4-1 and 4-2 and then also via their powder outlet valves 42-1 or 42-2 and the powder outlet channels 40-1, 40-2 to the powder delivery line 50 and from this through the Powder sprayer 52 can flow to the outside atmosphere around the whole Clean the system of powder residues.
- Compressed gas e.g. B. compressed air
- a, preferably electronic or computerized pump control device 68 can also be provided that at the same time or after this cleaning pressurized gas, e.g. B. compressed air from a Pressurized gas source 45-1 or 45-2 via the pressurized gas inlet channel 44-1 or 44-2 and the associated controllable compressed gas inlet valve 46-1 or 46-2 in one Blown in end of the dosing chamber 4-1 or 4-2 and thus powder from the Dosing chamber at the other end of the chamber through the local powder outlet valve 42-1 or 42-2 and the adjoining powder outlet channel 40-1 or 40-2 blown out through the powder discharge line 50 and the powder spraying device 52 becomes.
- pressurized gas e.g. B. compressed air from a Pressurized gas source 45-1 or 45-2 via the pressurized gas inlet channel 44-1 or 44-2 and the associated controllable compressed gas inlet valve 46-1 or 46-2 in one Blown in end of the dosing chamber 4-1 or 4-2 and thus powder from the Dosing chamber at the other end of the chamber through the local
- the compressed gas inlet channel 44-1 or 44-2 can be parallel to it arranged compressed gas cleaning channel 72-1 or 72-2, which against the downstream parts of the relevant powder inlet valve 38-1 or 38-2 is directed to clean them of powder particles, if not already Compressed gas inlet channel 44-1 and 44-2 against the downstream areas of the Powder inlet valves 38-1 or 38-2 is directed and thereby cleans them.
- a valve 71 can be opened to pressurized gas, for. B. Compressed air, from a compressed gas source 75 through an additional gas line 73-1 or 73-2 against the downstream parts of the powder outlet valves 42-1 and 42-2 which the auxiliary gas line is directed to blow and from there through the Powder outlet channels 40-1 and 40-2 and the powder discharge line 50 for Powder spray device 52 and from there to lead into the outside atmosphere.
- the pump device 68 controls all controllable valves and the color changer 60th
- the pump control device 68 contains a time control device 74, through which depending on the predetermined suction stroke position, e.g. B. P1 or P2 of the membrane 8-1 shown on the left and a predetermined one Suction stroke position, e.g. B. P4 or P3, the membrane 8-2 shown on the right, past predetermined delay period of conveying the powder the relevant dosing chamber 4-1 or 4-2 is started.
- a predetermined suction stroke position e.g. B. P1 or P2 of the membrane 8-1 shown on the left
- a predetermined one Suction stroke position e.g. B. P4 or P3
- the compressed gas from the compressed gas source 45-1 or 45-2 Compressed gas inlet valve 46-1 or 46-2 into the metering chamber 4-1 or 4-2 so that the amount of powder dosed until the end of the delay time is pressed out of the dosing chamber by means of this compressed gas relevant powder outlet valve 42-1 or 42-2 in the powder discharge line 50 and from this to the powder spraying device 52 or to a powder container.
- said "predetermined suction stroke position” the suction stroke start position "a" corresponding to P1 for the left diaphragm 8-1 and “d” corresponding to P4 for the right membrane 8-2, which in Fig. 1 for the left membrane 8-1 shown is the position "a” shown in solid lines, and which for the membrane 8-2 shown on the right in FIG. 1 is shown in broken lines position shown is "d".
- the suction stroke start position "a" is for the membrane shown in FIGS. 1 and 2 on the left 8-1 detected by a sensor S1 at a position P1. This is for the left Membrane 8-1 at the same time the pressure stroke end position. For the right membrane is 8-2 the position P1 on the sensor S1 the suction stroke end position and at the same time the Druckhub researchingsposition.
- the suction stroke start position "d" is for that shown in Figs. 1 and 2 on the right Membrane 8-2 detected by a sensor S4 at a position P4. This is for the right diaphragm 8-2 at the same time the pressure stroke end position.
- For the left membrane 8-1 position P4 on sensor S4 is the suction stroke end position and at the same time the Druckhub researchingsposition.
- the sensor in question sends a signal to the Pump control device 68 for reversing the movement of the drive piston 12 and thus the two membranes in one direction or the other Compressed air supply to the compressed air control opening 26 or to the compressed air control opening 28 and by venting the other compressed air control opening.
- the said "predetermined suction stroke position” means the suction stroke start position "a” or “d” Is membrane 8-1 or membrane 8-2
- the timer 74 the pump control device 68 on the basis of the signals from the sensors S1 and S4, when the membranes 8-1 and 8-2 have reached the relevant end position.
- the sensors S1 and S4 can be arranged anywhere, where Positions of the membrane 8-1 and 8-2 can be determined, especially at points of the Cylinder 22 or the drive piston 12 or the piston rods 14-1 and 14-2 or the chamber housing 6-1, 6-2 or the membranes 8-1 and 8-2. According to In a preferred embodiment, they are on the cylinder 22, preferably on the cylinder Outside, arranged at positions P1 and P4, which the drive piston 12th each when the membranes 8-1 and 8-2 are in one of the two End positions.
- the compressed gas source 45-1 can be metered by means of compressed gas Powder from the left dosing chamber 4-1, and by means of compressed gas from the compressed gas source 45-2 dosed powder from the right dosing chamber 4-2 not only when the Suction stroke end position "b" of the left membrane 8-1 and "c” of the right membrane 8-2 are expelled through the relevant powder outlet valve 42-1 or 42-2, but also earlier, if only a small amount of powder in the relevant dosing chamber. This is due to a delay period achieved, which is preferably variably adjustable on the time control device 74 is. This makes it possible to dispense smaller amounts of powder from the relevant one Eject dosing chamber 4-1 or 4-2 before the associated membrane 8-1 or 8-2 has completed its full suction stroke.
- this predetermined suction stroke position is for the membrane 8-1 shown on the left in FIGS. 1 and 2 by a sensor S2 on a Position P2 and for the membrane 8-2 shown in FIGS. 1 and 2 on the right by a Sensor S3 defined at a position P3.
- the two sensors S2 and S3 can like sensors S1 and S2 can be placed anywhere where they defined positions of the membrane 8-1 and 8-2 between their end positions a, b, c and d can be detected, for example on the cylinder 22, on the drive piston 12, on its piston rods 14-1 and 14-2 or on the membranes themselves or on the chamber housing 6-1, 6-2. According to a preferred embodiment of the Invention, they are arranged on the cylinder 22.
- the sensor S2 sends each then a signal to the timing device 74 of the Pump controller 68 when the left diaphragm 8-1 is a sensor S2 Appropriate position reached, which is chosen so that it is the suction stroke of the predetermined suction stroke position of the left diaphragm 8-1.
- the sensor S3 then sends a signal to the time control device 74 in each case Pump controller 68 when the right diaphragm 8-2 is a sensor S3 Appropriate position reached, which is chosen so that it is the suction stroke of the predetermined suction stroke position of the right diaphragm 8-2 corresponds.
- the Time control device Through the the signal sequence of the attached sensors recognizes the Time control device, whether on receipt of a signal from sensor S2 or Sensor S3 the left membrane 8-1 or the right membrane 8-2 to this Executes a suction stroke at the time.
- the Time delay device 74 the predetermined time delay period, at the other End of pressurized gas left in the metering chamber 4-1 or in the metering chamber 4-2 is used to squeeze out the metered amount of powder.
- the movement distance is Membranes 8-1 and 8-2 consistently the same size for all stroke movements and they extends from sensor S1 to sensor S4 or vice versa.
- FIG. 2 shows a diagram above the pump device, in which on the horizontal axis S the stroke distance of the drive piston 12, which corresponds to the movement distance of the diaphragms 8-1 and 8-2, with the end position P1 in the sensor S1, the end position P4 in the sensor S4, the predetermined partial suction stroke position P2 for the sensor S2 and the predetermined partial suction stroke position P3 for the sensor S3.
- the suction stroke times It 0 to It 10 for the membrane 8-1 shown on the left are plotted on the vertical axis of the diagram. In the opposite direction from the end position P4 to the end position P1, this corresponds to the pressure stroke of the membrane 8-1 shown on the left.
- the timer 74 starts a predetermined, preferably variably adjustable, delay period, during which the compressed gas from the compressed gas source 45-1 is admitted into the metering chamber 4-1 via the compressed gas inlet channel 44-1, so that Pressurized gas presses the amount of powder previously sucked into this metering chamber 4-1 through the powder outlet valve 42-1 into the powder delivery line 50 and through it out of the powder spray device 52.
- the end of the delay period can be any time during which the drive piston 12 and the like are the membrane 8-1 shown on the left is located between the predetermined partial suction stroke position P2 in the sensor S2 and the suction stroke end position P4 in the sensor S4.
- the diaphragm 8-2 shown on the right is moved by the drive piston 12 from its suction stroke start position "d" (dash stroke end position) shown in broken lines to the suction stroke end position "c" shown in solid lines, whereby it moves over the Powder inlet valve 38-2 sucks powder from color changer 60 into its dosing chamber 4-2. If the drive piston 12 reaches the predetermined suction stroke position P3 in the sensor S3 during this suction stroke from position P4 at S4, a predetermined, preferably variably adjustable, delay time period is started by a signal from this sensor S3 from the timing control device 74.
- the pump control device 68 When this delay period has elapsed, the pump control device 68, triggered by the time control device 74, admitted pressurized gas from the pressurized gas source 45-2 shown on the right in FIG. 1 via its pressurized gas inlet valve 46-2 and the pressurized air inlet channel 44-2 into the metering chamber 4-2 shown on the right. in order to press the quantity of powder sucked in up to this point in time and thus correspondingly from this metering chamber 4-2 through its powder outlet valve 42-2 to the powder discharge line 50 and from there through the powder spraying device 52.
- This point in time at which the powder is expelled from the metering chamber 4-2 by means of the compressed gas can be at any point in the movement of the drive piston 12 between the predetermined suction stroke position P3 for the sensor S3 and the suction stroke end position P1 for the sensor S1.
- the numbers of the time axes It 0 to It 10 and rt 0 to rt 10 are chosen arbitrarily.
- a check valve 76-1 or 76-2 near the inlet of the compressed gas inlet channel 44-1 or 44-2 into the metering chamber 4-1 or 4-2 to arrange, which opens automatically in the compressed gas supply direction and in opposite flow direction closes automatically. This avoids that powder particles from the dosing chamber 4-1 or 4-2 into the Compressed gas inlet valves 46-1 and 46-2 can migrate back.
- the Powder inlet valves 38-1 and 38-2 and / or the powder outlet valves 42-1 and 42-2 no controlled valves, but automatically opening and closing valves like a check valve.
- the one for ejecting the dosed amount of powder from the concerned Dosing chamber 4-1 or 4-2 used gas pressure of the compressed gas source 45-1 or 45-2 is greater than the negative pressure and causes the powder inlet valve 38-1 or 38-2 is closed automatically.
- the powder outlet valves 42-1 and 42-2 are reversed from the powder inlet valves arranged.
- the relevant powder outlet valve 42-1 or 42-2 is Negative pressure during the suction stroke of the associated membrane 8-1 or 8-2 closed and from the compressed gas in the metering chambers to expel the dosed amount of powder opened to the dosed amount of powder by means of Compressed gas through the opened powder outlet valve 42-1 or 42-2 and the subsequent powder outlet channel 40-1 or 40-2 into the powder discharge line 50 and to press it into the powder spraying device 52.
- the compressed gas overcomes the negative pressure.
- the powder suction line 58 could instead of directly to a color changer 60 one of the powder containers 62, 63 or 64.
- the powder spray device 52 usually also as a powder spray device referred to, a nozzle or a for spraying or spraying the powder Have a rotating body or a rotating nozzle, as is known from the prior art Technology is known.
- a method for conveying powder, especially coating powder in which by enlarging the Volume of a dosing chamber 4-1 and / or 4-2 powder from a powder source in the dosing chamber 4-1 or 4-2 can be sucked in and then the compressed gas metered amount of powder can be pressed out of the metering chamber.
- the cycle is periodically repeatable.
- a predetermined phase or position of the periodic volume changes the dosing chamber 4-1 or 4-2 determined and after a predetermined Time delay after reaching the predetermined phase is determined by the Compressed air the previously metered amount of powder from the dosing chamber 4-1 or 4-2 pushed out.
- each membrane 8-1 and 8-2 can have its own drive 10.
- a membrane 8-1 or 8-2 as a displacer enables one compact small design.
- the invention is not based on the use of a Limited membrane, but instead of a membrane can also be a piston in a cylinder can be used.
- Fig. 3 shows an embodiment of the invention in which instead of one Membrane a piston is used as a displacer. 3 shows the Possibility of replacing a single drive for two or more displacers (Membrane or piston) one for each displacement body (membrane or piston) to use your own drive.
- FIG. 3 parts corresponding to Figs. 1 and 2 are given the same reference numerals Mistake.
- the above description of FIGS. 1 and 2 thus also applies to FIG. 3 to. 3 also shows the possibility of not using the sensors S1, S2, S3 and S4 Arrange detection of the drive piston 12, but for the detection of the respective Position of the displacer piston 8-1 or 8-2. 3, however also the possibility of these sensors not the displacer piston 8-1 and 8-2 assign, but the drive piston 12 or another element.
- Powder suction line 58 is provided, which leads to different powder sources (Powder container or color changer) or according to Fig. 3 to a common Powder source, e.g. B. can lead a powder container 62.
- a powder container e.g. B.
- Fig. 1 can be provided for both powder inlet channels 36-1 and 36-2. This can go directly to a powder container, e.g. B. 62, lead to or Color changer 60 corresponding to FIG. 1.
- FIGS. 1 and 2 on the one hand and FIG. 3 on the other hand are mutual interchangeable to form new combinations.
- the invention is also for combinations of three or more powder pumps usable, the powder inlet channels to a common or to different Powder sources are connected or connectable and their Powder outlet channels are all connected to a common powder discharge opening are, wherein a pump control device is designed such that it Pumps are controlled to offset their suction strokes relative to one another and to do so to execute their pressure strokes at a corresponding time, so that the Pumps suck in powder at different times and at different times dispense dosed amounts of powder, but with at least one pump Displacer (membrane or powder displacer) in one Intermediate position between end positions when the displacer from at least one of the other pumps is in an end position.
- a pump control device is designed such that it Pumps are controlled to offset their suction strokes relative to one another and to do so to execute their pressure strokes at a corresponding time, so that the Pumps suck in powder at different times and at different times dispense dosed amounts of powder, but with at least one pump Displacer (membrane or powder dis
- pressurized gases and pressurized gas sources mentioned can use compressed air or Be compressed air sources.
- other compressed gases e.g. B. noble gases
- corresponding other pressurized gas sources e.g. B. noble gas sources
- Two or more or all of the pressurized gas sources mentioned can be a single one Be a pressurized gas source from which the various pressurized gases can be removed.
- the pump controller 68 is configured to control the Switching the movements of the displacement bodies 8-1 and 8-2 of suction stroke on pressure stroke, and vice versa, depending on signals from sensors S1 and S4, each of which generates a signal when the Displacer 8-1 or 8-2 along the stroke on one or the other from two predetermined motion reversal positions.
- the pump controller 68 includes one Clock timer 80, by which the time-delayed injection of compressed gas in the dosing chamber 4-1 or 4-2 is subject to a fixed cycle time. After this Cycle time, the pump controller 68 sends control signals to the Changeover valve 30, which in and out by compressed gas supply and discharge the cylinder 22 of the drive 10, the movements of the displacer 8-1 and 8-2 and thus the opposite volume changes of the two Dosing chambers 4-1 and 4-2 effect.
- control signals preferably the control signal for starting the suction stroke
- these control signals also cause the time delay of the timing control device 74 is started.
- the pump controller 68 is the predetermined one Suction stroke position of the displacer 8-1 and 8-2 not based on Recognizes sensor signals (sensors S1, S2, S3, S4), but through control signals, which are each generated when the cycle time of the clock timer 80 expires.
- the drive piston 12 and thus also the Displacer 8-1 and 8-2 their predetermined at the end of the cycle time Have reached end positions. Deviations between the predetermined End positions and the actually reached end positions can then arise when the resistance to movement of the elements to be moved change, for example through material wear, material fatigue or through Dirt.
- a sensor S5 can be arranged at a position P5, which the pump control device 68 provides a signal when the relevant Element, in the preferred embodiment the drive piston 12 in position P5 of the control sensor S5.
- Pump drive control device 68 calculate whether the drive piston 12 the Control sensor S5 has reached in a predetermined period of time (or with a predetermined speed), which is required so that it is timely reached its end position. In the event of deviations by a predetermined value the pump controller 68 generate a fault signal (or warning signal).
- FIG 4 shows a further control sensor S6 in addition to the control sensor S5 a position P6 at a distance in the direction of movement of the drive piston 12 from the one control sensor S5 and also at a distance from the two end positions of the drive piston 12, for generating a control signal in the Pump control device 68 each time the drive piston 12 opposite one of these two control sensors S5 or S6.
- the pump controller 68 Compare the time difference between the generation of the two control signals of the two control sensors S5 and S6 determine with a set time whether the Displacer 8-1, 8-2 each within the cycle time their predetermined Reach the end position.
- the Time difference the speed of the drive piston 12 or Displacer 4-1, 4-2 calculated by the pump control device and with a target speed can be compared. If there are deviations between the target time and actual time or between target speed and actual speed, and thus also between deviations from the predetermined end position and the actually reached end position of the drive piston 12 at its Reversal of movement, by a certain deviation value, can Pump control device 68 generate a defect signal.
- the defect signal can be used for various purposes, for example for visual and / or acoustic display of the defect or for storing the Defect values in the memory of a computer for diagnostic purposes.
- the defect signal can be used for this be used depending on the difference between target time (or -speed) and actual time (or -speed) of the drive piston 12 das Control switch 30 to be controlled accordingly so that the changed Speed of the drive piston 12 by changing its stroke frequency is compensated so that the powder volume delivery of the pump device remains constant within a predetermined tolerance range.
- Fig. 4 is identical to that of Figs. 1 and 2, with the Exception that the pump control device 68 contains the clock timer 80 and the sensors S1, S2, S3 and S4 by the control sensor S5 or by the two Control sensors S5 and S6 are replaced. The same parts have the same parts Reference numerals.
- FIG. 4 The embodiments of the invention described with reference to FIG. 4 are also applicable to embodiments which are not like FIGS. 1, 2 and 4 Membranes, but pistons according to FIG. 3 as displacer 8-1 or 8-2 to have.
- the cycle time and / or the delay time can be variably adjustable.
- the cycle time and / or the delay time can be variably adjustable.
- the delay time is variably adjustable to the desired one Set powder feed rate per unit of time.
- the delay period is here the length of time by which the powder is conveyed out of the concerned Dosing chamber 4-1 or 4-2 is started after the relevant delayed Cycle time has expired at which the displacer 8-1 or 8-2 of Pressure stroke was switched to suction stroke.
- Figures 5 to 8 show a further embodiment of the invention, according to which are the powder inlet valves 38-1 and 38-2 and / or the powder outlet valves 42-1 and 42-2 self-acting one-way valves Duck bill valve (duck bill valve), which are in the forward direction of the pressure of the compressed gas automatically opened and in the blocking direction from the pressure of the Compressed gas and / or automatically closed by its own material spring elasticity become.
- Duck bill valve duck bill valve
- FIGs 5 to 8 with the reference number Designated 38/42. It consists of a one-piece body made of resilient Material such as rubber. It contains a cylindrical part 82 with a radially outwardly projecting flange 84 at one end and with a duckbill tapered tube portion 86 at the other end.
- FIG. 9 shows the one-way valve 38/42 in a side view relative to FIGS. 5 and 7 turned by 90 degrees.
- the movement reversal points can (Dead points) of the displacer 8-1, 8-2 a waiting time can be provided, during which the pump device can calm down before the next one The lifting movement begins.
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Abstract
Description
- Fig. 1
- schematisch, teilweise im Querschnitt, eine Doppelpumpeneinrichtung nach der Erfindung,
- Fig. 2
- schematisch Teile von Fig. 1 zusammen mit einem Funktionsdiagramm zur Erklärung der Erfindung,
- Fig. 3
- schematisch, teilweise im Querschnitt, eine weitere Ausführungsform einer Doppelpumpeneinrichtung nach der Erfindung,
- Fig. 4
- schematisch, teilweise im Querschnitt, eine weitere Ausführungsform einer Doppelpumpeneinrichtung nach der Erfindung,
- Fig. 5
- einen Längsschnitt durch ein Einwegventil nach Art eines Entenschnabels im Schließzustand, welches bei allen Ausführungsformen von Pumpeneinrichtungen nach der Erfindung als Pulvereinlassventil und/oder als Pulverauslassventil verwendbar ist,
- Fig. 6
- das Einwegventil von Fig. 5 in Vorderansicht entgegen der Durchlassrichtung gesehen,
- Fig. 7
- das Einwegventil im Längsschnitt gesehen im Offenzustand,
- Fig. 8
- eine Vorderansicht entgegen der Durchlassrichtung gesehen auf das Einwegventil von Fig. 7 im Offenzustand,
- Fig. 9
- das Einwegventil der Figuren 5 bis 8 in Seitenansicht gesehen, relativ zu den Figuren 5 und 7 um 90° um die Längsachse gedreht.
Claims (26)
- Pumpeneinrichtung für Pulver (54), insbesondere für Beschichtungspulver, enthaltend mindestens eine Pulver-Pumpe (2-1,2-2), weiche eine Dosierkammer (4-1,4-2) aufweist, die von einem Kammergehäuse (6-1,6-2) und einem Verdrängerkörper (8-1,8-2) begrenzt ist; welcher relativ zum Kammergehäuse während eines Druckhubes vor und während eines Saughubes zurück bewegbar ist, wobei die Pumpenkammer einen Pulvereinlasskanal (36-1,36-2), welchem ein Pulvereinlassventil (38-1,38-2) zugeordnet ist, einen Pulverauslasskanal (40-1,40-2), welchem ein Pulverauslassventil (42-1,42-2) zugeordnet ist, und einen Druckgaseinlasskanal (44-1,44-2), welchem ein Druckgaseinlassventil (46-1, 46-2) zugeordnet ist, aufweist, wobei zum Ansaugen einer dosierten Menge von Pulver (54) in die Dosierkammer (4-1,4-2) das Pulvereinlassventil (38-1, 38-2) aufmachbar ist und das Pulverauslassventil (42-1,42-2) und das Druckgaseinlassventil (46-1,46-2) schließbar sind, so dass der sich in Saughubrichtung bewegende Verdrängerkörper Pulver (54) durch den Pulvereinlasskanal (36-1,36-2) in die Dosierkammer (4-1,4-2) saugen kann, und zum Fördern von der dosierten Pulvermenge aus der Dosierkammer (4-1, 4-2) das Pulvereinlassventil (38-1,38-2) schließbar ist und das Pulverauslassventil (42-1,42-2) und das Druckgaseinlassventil (46-1,46-2) aufmachbar sind, so dass von dem Druckgaseinlasskanal (44-1,44-2) in die Dosierkammer (4-1,4-2) strömendes Druckgas die dosierte Pulvermenge von der Dosierkammer (4-1,4-2) in den Pulverauslasskanal (40-1,40-2) drücken kann, und eine Pumpensteuereinrichtung (68) zur Steuerung des Druckgaseinlassventils (46-1, 46-2)
dadurch gekennzeichnet, dass die Pumpensteuereinrichtung (68) eine Zeitsteuereinrichtung (74) aufweist, durch welche in Abhängigkeit von der seit einem vorbestimmten Betriebszeitpunkt vergangenen vorbestimmten Verzögerungszeitdauer das Fördern des Pulvers aus der Dosierkammer (4-1, 4-2) gestartet wird, wobei am Ende der Verzögerungszeitdauer das Druckgas in die Dosierkammer (4-1, 4-2) eingelassen und die bis zum Ende Verzögerungszeitdauer dosierte Pulvermenge mittels des Druckgases aus der Dosierkammer (4-1, 4-2) heraus gedrückt wird. - Pumpeneinrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass die Pumpensteuereinrichtung (68) einen Taktzeitgeber aufweist und jeweils nach Ablauf einer vorbestimmten Taktzeit Steuersignale an eine Umschalteinrichtung (34) zur Umschaltung der Bewegung des Verdrängerkörpers (8-1, 8-2) von Saughub auf Druckhub, und umgekehrt von Druckhub auf Saughub, im Rhythmus der vorbestimmten Taktzeit sendet, und dass die Pumpensteuereinrichtung (68) ausgebildet ist, um an der Zeitsteuereinrichtung (74) die vorbestimmte Verzögerungszeitdauer jeweils in Abhängigkeit von dem Zeitpunkt des Entstehens desjenigen Steuersignals zu starten, welches den Start des Saughubes bewirkt, wobei am Ende der Verzögerungszeitdauer das Druckgas in die Dosierkammer (4-1, 4-2) eingelassen und die bis zum Ende Verzögerungszeitdauer dosierte Pulvermenge mittels des Druckgases aus der Dosierkammer (4-1, 4-2) heraus gedrückt wird. - Pumpeneinrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass mindestens ein Kontrollsensor (S5, S6) vorgesehen ist zur Erkennung, wann sich der Verdrängerkörper (8-1, 8-2) in einer vorbestimmten Position befindet, und zur Erzeugung eines Sensorsignals bei Erkennung, wenn sich der Verdrängerkörper in der vorbestimmten Position befindet, dass die Pumpensteuereinrichtung (68) mit dem mindestens einen Kontrollsensor funktionsmäßig verbunden ist, und dass die Pumpensteuereinrichtung (68) ausgebildet ist zum automatischen Vergleichen des Zeitpunktes des Sensorsignals mit dem Zeitpunkt von mindestens einem der Steuersignale zur Kontrolle, ob die Zeitdauer zwischen den beiden Zeitpunkten von einem vorbestimmten Wert abweicht, und zur Erzeugung eines Defektsignals, wenn eine vorbestimmte Abweichung von dem vorbestimmten Wert entsteht. - Pumpeneinrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass mindestens zwei Kontrollsensoren (S5, S6) vorgesehen und mit der Pumpensteuereinrichtung (68) verbunden sind zur Erkennung, wann sich der Verdrängerkörper (8-1, 8-2) jeweils in einer von zwei verschiedenen vorbestimmten Positionen befindet und zur Erzeugung von Sensorsignalen bei Erkennung des Verdrängerkörpers in den vorbestimmten Positionen, und dass die Pumpensteuereinrichtung (168) ausgebildet ist zum Vergleichen der Zeitdifferenz zwischen den Signalen des einen Kontrollsensors und den Signalen des anderen Kontrollsensors mit einer vorbestimmten Zeitdauer, und zur Erzeugung eines Defektsignals dann, wenn die Zeitdifferenz von der vorbestimmten Zeitdauer um mehr als einen vorbestimmten Wert abweicht. - Pumpeneinrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass die Pumpensteuereinrichtung (68) eine Zeitsteuereinrichtung (74) aufweist, um in Abhängigkeit von der seit einer vorbestimmten Saughubposition des Verdrängerkörpers (8-1,8-2) vergangenen vorbestimmten Verzögerungszeitdauer das Fördern des Pulvers aus der Dosierkammer zu starten, wobei am Ende der Verzögerungszeitdauer das Druckgas in die Dosierkammer (4-1,4-2) eingelassen und die bis zum Ende der Verzögerungszeitdauer dosierte Pulvermenge mittels des Druckgases aus der Dosierkammer (4-1,4-2) heraus gedrückt wird. - Pumpeneinrichtung nach Anspruch 5,
dadurch gekennzeichnet, dass die vorbestimme Saughubposition eine Saughubanfangsposition ist. - Pumpeneinrichtung nach Anspruch 5,
dadurch gekennzeichnet, dass die vorbestimmte Saughubposition zwischen einer Saughubanfangsposition und einer Saughubendposition liegt. - Pumpeneinrichtung nach Anspruch 5,
dadurch gekennzeichnet, dass die vorbestimmte Saughubposition zwischen einer Saughubanfangsposition und einer Saughubendposition näher bei der Saughubanfangsposition als bei der Saughubendposition liegt. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche 5 bis 8,
dadurch gekennzeichnet, dass die Zeitsteuereinrichtung (74) mindestens einen Sensor (S1,S4;S2,S3) zur Erzeugung eines Signals aufweist, wenn sich der Verdrängerkörper (8-1, 8-2) in der vorbestimmten Saughubposition befindet. - Pumpeneinrichtung nach einem der Ansprüche 5 bis 9,
dadurch gekennzeichnet, dass eine Pumpensteuereinrichtung (68) vorgesehen ist, durch welche die Umschaltungen der Bewegungen des Verdrängerkörpers (8-1,8-2) von Saughub auf Druckhub, und umgekehrt, in Abhängigkeit von Signalen von Sensoren (S1,S4) erfolgt, welche jeweils ein Signal erzeugen, wenn sich der Verdrängerkörper (8-1,8-2) längs der Hubstrecke an der einen oder der anderen von zwei vorbestimmten Bewegungsumkehrpositionen befindet. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Bewegungsstrecke des Verdrängerkörpers (8-1,8-2) bei allen Hubbewegungen konstant gleich groß ist. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass an mindestens einem der Bewegungsumkehr-Todpunkte des Verdrängerkörpers (8-1, 8-2) eine zweite Zeitverzögerungsdauer vorgesehen ist, bevor der Verdrängerkörper (8-1, 8-2) nach der einen Bewegungsrichtung in die betreffende andere Bewegungsrichtung bewegt wird. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass die Verzögerungszeitdauer variabel einstellbar ist. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass der Verdrängerkörper (8-1,8-2) eine flexible Membran ist. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass das Pulvereinlassventil (38-1,38-2) und das Pulverauslassventil (42-1, 42-2) selbsttätige Ventile sind, welche durch Differenzdruck zwischen ihren beiden Ventilseiten selbsttätig öffnen bzw. schließen. - Pumpeneinrichtung nach Anspruch 15,
dadurch gekennzeichnet, dass das Pulvereinlassventil (38-1,38-2) und das Pulverauslassventil (42-1, 42-2) selbsttätige Ventile sind, welche nach Art eines Rückschlagventils durch Differenzgasdruck über ihrem Ventilkörper (38-3,42-3) betätigbar sind, wobei der Ventilkörper (38-3,42-3) in Abhängigkeit von diesem Differenzgasdruck relativ zu einem Ventilsitz (38-4,42-4) in Offenstellung oder in Schließstellung bewegbar ist und in der betreffenden Stellung haltbar ist. - Pumpeneinrichtung nach Anspruch 15,
dadurch gekennzeichnet, dass das Pulvereinlassventil (38-1,38-2) und das Pulverauslassventil (42-1, 42-2) selbsttätige Ventile nach Art eines Entenschnabels sind, dessen Entenschnabel durch Druckdifferenz zwischen Entenschnabelinnenseite und Entenschnabelaußenseite selbsttätig öffnet bzw. schließt. - Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass mindestens zwei der genannten Pulver-Pumpen (2-1,2-2) vorgesehen sind, deren Pulvereinlasskanäle (36-1,36-2) mit einer Pulverquelle verbindbar oder verbunden sind und deren Pulverauslasskanäle (40-1,40-2) mit einer gemeinsamen Pulverabgabeöffnung (48) verbindbar oder verbunden sind, und dass die beiden Pulver-Pumpen (2-1,2-2) relativ zueinander gegenläufig betreibbar sind, so dass wechselweise von der Dosierkammer (4-1) der einen Pulver-Pumpe (2-1) oder der Dosierkammer (4-2) der anderen Pulver-Pumpe (2-2) eine dosierte Pulvermenge mittels des Druckgases in den Pulverauslasskanal (40-1,40-2) ausstoßbar ist, und entgegengesetzt wechselweise Pulver durch die Pulvereinlasskanäle (36-1,36-2) in die andere oder die eine Dosierkammer (4-1,4-2) einsaugbar ist. - Pumpeneinrichtung nach Anspruch 18,
dadurch gekennzeichnet, dass die Verdrängerkörper (8-1,8-2) der beiden Pumpen einen gemeinsamen Antrieb (10) haben. - Pulverbeschichtungseinrichtung,
gekennzeichnet durch
eine Pumpeneinrichtung nach mindestens einem der vorhergehenden Ansprüche zur Förderung von Beschichtungspulver. - Verfahren zur Förderung von Pulver (54), insbesondere Beschichtungspulver, bei welchem durch Vergrößern des Volumens einer Dosierkammer (4-1,4-2) Pulver (54) von einer Pulverquelle in die Dosierkammer (4-1,4-2) eingesaugt und anschließend mittels Druckgas die dosierte Pulvermenge aus der Dosierkammer (4-1,4-2) heraus gedrückt wird, wonach das Volumen der Dosierkammer (4-1,4-2) verkleinert wird, und dann der Zyklus periodisch wiederholt wird,
dadurch gekennzeichnet, dass mittels Sensoren (S1,S4;S2,S3) eine vorbestimmte Phase der periodisch erfolgenden Volumenänderung der Dosierkammer (4-1,4-2) ermittelt wird und
dass mit einer vorbestimmten Zeitverzögerung nach dem Erreichen der vorbestimmten Phase mittels des Druckgases die bis dahin dosierte Pulvermenge aus der Dosierkammer (4-1,4-2) heraus gedrückt wird. - Verfahren nach Anspruch 21,
dadurch gekennzeichnet, dass in einem Pulvereinlasskanal (36-1,36-2) in die Dosierkammer (4-1,4-2), und in einem Pulverauslasskanal (40-1,40-2) aus der Dosierkammer (4-1,4-2), je mindestens ein Ventil in dem betreffenden Weg verwendet wird, welches in Abhängigkeit von der jeweiligen Gasdruckdifferenz zwischen seiner stromaufwärtigen Seite und seiner stromabwärtigen Seite nach Art eines Rückschlagventiles selbstständig auf und zu macht - Verfahren zur Förderung von Pulver (54), insbesondere Beschichtungspulver, bei welchem durch Vergrößern des Volumens von mindestens einer Dosierkammer (4-1, 4-2) Pulver (54) von einer Pulverquelle in die Dosierkammer (4-1, 4-2) eingesaugt und anschließend mittels Druckgas die dosierte Pulvermenge aus der Dosierkammer (4-1, 4-2) herausgedrückt wird, wonach das Volumen der Dosierkammer (4-1, 4-2) verkleinert wird, und dann der Zyklus periodisch wiederholt wird,
dadurch gekennzeichnet, dass die Volumenänderungen der mindestens einen Dosierkammer (4-1, 4-2) durch einen vorbestimmte Taktzeit gesteuert werden, dass jeweils nach Ablauf der vorbestimmten Taktzeit mindestens ein Steuersignal erzeugt wird, dass durch dieses mindestens eine Steuersignal die Richtung der Volumenänderung von Vergrößern auf Verkleinern, bzw. von Verkleinern auf Vergrößern, umgekehrt wird, und gleichzeitig eine vorbestimmte Zeitverzögerung gestartet wird, und dass erst bei Ablauf der vorbestimmten Zeitverzögerung mittels des Druckgases die dosierte Pulvermenge aus der Dosierkammer herausgedrückt wird. - Verfahren nach Anspruch 23,
dadurch gekennzeichnet, dass die Volumenänderungen der mindestens einen Dosierkammer (4-1, 4-2) durch einen Verdrängerkörper (8-1, 8-2) bewirkt werden, dass mittels mindestens eines Kontrollsensors (S5, S6) die Präsenz des Verdrängerkörpers in einer vorbestimmten Position ermittelt wird und dabei ein Kontrollsignal bei Erkennung des Verdrängerkörpers in der vorbestimmten Position erzeugt wird, und dass die Zeitdifferenz zwischen dem Zeitpunkt des Steuersignals und dem Zeitpunkt des mindestens einen Steuersignals mit einer vorbestimmten Zeitdauer verglichen wird, welche die Zeitdifferenz haben würde, wenn der Verdrängerkörper innerhalb jeder Taktzeit eine vorbestimmte Wegstrecke zurücklegen würde, und dass ein Defektsignal erzeugt wird, wenn der Unterschied zwischen der Zeitdifferenz und der vorbestimmten Zeitdauer einen vorbestimmten Wert übersteigt. - Verfahren nach Anspruch 23,
dadurch gekennzeichnet, dass die Volumenänderungen der mindestens einen Dosierkammer durch einen Verdrängerkörper (8-1, 8-2) bewirkt wird, dass mit mindestens zwei Kontrollsensoren (S5, S6), welche entlang einer der maximalen Bewegungsstrecke des Verdrängerkörpers entsprechenden Strecke mit Abstand voneinander angeordnet sind, Kontrollsignale erzeugt werden, wenn der Verdrängerkörper in einer der Sensorposition entsprechenden Position ist, dass die Zeitdifferenz zwischen den Kontrollsignalen des einen Kontrollsensors zu den Kontrollsignalen des anderen Kontrollsensors mit einer vorbestimmten Zeitdauer verglichen wird, welche die Zeitdifferenz betragen würde, wenn sich der Verdrängerkörper innerhalb der Taktzeit eine vorbestimmte Soll-Bewegungsstrecke bewegen würde, und dass jeweils mindestens dann ein Defektsignal erzeugt wird, wenn die Zeitdifferenz von der vorbestimmten Zeitdauer um mehr als einen vorbestimmten Wert abweicht. - Verfahren nach einem der Ansprüche 21 bis 25,
dadurch gekennzeichnet, dass zwei von den Dosierkammern (4-1, 4-2) gleichzeitig, jedoch phasenverschoben zueinander bezüglich ihres Volumens verändert werden, wobei das Volumen der einen Dosierkammer vergrößert wird, während das Volumen der anderen Dosierkammer verkleinert wird, und umgekehrt.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10300280A DE10300280A1 (de) | 2003-01-08 | 2003-01-08 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
DE50309018T DE50309018D1 (de) | 2003-01-08 | 2003-06-27 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
EP03014661A EP1437178B1 (de) | 2003-01-08 | 2003-06-27 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
CA002453866A CA2453866A1 (en) | 2003-01-08 | 2003-12-18 | Method and system for pumping powder, and powder coating apparatus |
CNA200310123292XA CN1517548A (zh) | 2003-01-08 | 2003-12-22 | 粉末的泵装置及其使用方法和粉末涂层装置 |
JP2003435540A JP2004210544A (ja) | 2003-01-08 | 2003-12-26 | 粉末用のポンプ装置、粉末用の方法および粉末コーティング装置 |
KR1020040000644A KR100561219B1 (ko) | 2003-01-08 | 2004-01-06 | 코팅 분말용 펌핑 시스템, 분말 코팅 장치, 및 코팅 분말운반 방법 |
TW093100311A TWI275555B (en) | 2003-01-08 | 2004-01-07 | Method and system for pumping powder, and powder coating apparatus |
US10/752,099 US7287964B2 (en) | 2003-01-08 | 2004-01-07 | Method and system for pumping powder, and powder coating apparatus |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10300280 | 2003-01-08 | ||
DE10300280A DE10300280A1 (de) | 2003-01-08 | 2003-01-08 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
EP03014661A EP1437178B1 (de) | 2003-01-08 | 2003-06-27 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1437178A2 true EP1437178A2 (de) | 2004-07-14 |
EP1437178A3 EP1437178A3 (de) | 2006-01-18 |
EP1437178B1 EP1437178B1 (de) | 2008-01-16 |
Family
ID=32657769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03014661A Expired - Lifetime EP1437178B1 (de) | 2003-01-08 | 2003-06-27 | Pumpeneinrichtung für Pulver, Verfahren hierfür und Pulverbeschichtungseinrichtung |
Country Status (8)
Country | Link |
---|---|
US (1) | US7287964B2 (de) |
EP (1) | EP1437178B1 (de) |
JP (1) | JP2004210544A (de) |
KR (1) | KR100561219B1 (de) |
CN (1) | CN1517548A (de) |
CA (1) | CA2453866A1 (de) |
DE (2) | DE10300280A1 (de) |
TW (1) | TWI275555B (de) |
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US7150585B2 (en) | 2002-10-14 | 2006-12-19 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
WO2012139898A1 (de) * | 2011-04-15 | 2012-10-18 | Reinhausen Plasma Gmbh | Membranpumpe und verfahren zum fördern von feinkörnigen pulver mit hilfe einer membranpumpe |
DE102015108492A1 (de) * | 2015-05-29 | 2016-12-01 | Gema Switzerland Gmbh | Verfahren zum Betreiben einer Pulverdichtstrompumpe sowie Pulverdichtstrompumpe |
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US8491226B2 (en) | 2002-10-14 | 2013-07-23 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
US7478976B2 (en) | 2002-10-14 | 2009-01-20 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
US7481605B2 (en) | 2002-10-14 | 2009-01-27 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
US7648312B2 (en) | 2002-10-14 | 2010-01-19 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
US8057129B2 (en) | 2002-10-14 | 2011-11-15 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
US7150585B2 (en) | 2002-10-14 | 2006-12-19 | Nordson Corporation | Process and equipment for the conveyance of powdered material |
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EP1728558A2 (de) | 2005-05-31 | 2006-12-06 | Nordson Corporation | Pulver-Sprühpistole und Pumpe |
WO2012139898A1 (de) * | 2011-04-15 | 2012-10-18 | Reinhausen Plasma Gmbh | Membranpumpe und verfahren zum fördern von feinkörnigen pulver mit hilfe einer membranpumpe |
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EP2696989B1 (de) * | 2011-04-15 | 2019-11-20 | Maschinenfabrik Reinhausen GmbH | System und verfahren zum fördern von feinkörnigen pulver mit hilfe einer membranpumpe |
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US10835907B2 (en) | 2015-05-29 | 2020-11-17 | Gema Switzerland Gmbh | Method for operating a dense phase powder pump and dense phase powder pump |
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Also Published As
Publication number | Publication date |
---|---|
TWI275555B (en) | 2007-03-11 |
DE50309018D1 (de) | 2008-03-06 |
EP1437178B1 (de) | 2008-01-16 |
EP1437178A3 (de) | 2006-01-18 |
CA2453866A1 (en) | 2004-07-08 |
DE10300280A1 (de) | 2004-07-22 |
KR100561219B1 (ko) | 2006-03-15 |
TW200418704A (en) | 2004-10-01 |
CN1517548A (zh) | 2004-08-04 |
KR20040063817A (ko) | 2004-07-14 |
US20060159565A1 (en) | 2006-07-20 |
JP2004210544A (ja) | 2004-07-29 |
US7287964B2 (en) | 2007-10-30 |
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