EP4132722A1 - Pompe pour agent de revêtement, installation de revêtement et procédé de fonctionnement associé - Google Patents

Pompe pour agent de revêtement, installation de revêtement et procédé de fonctionnement associé

Info

Publication number
EP4132722A1
EP4132722A1 EP21718058.7A EP21718058A EP4132722A1 EP 4132722 A1 EP4132722 A1 EP 4132722A1 EP 21718058 A EP21718058 A EP 21718058A EP 4132722 A1 EP4132722 A1 EP 4132722A1
Authority
EP
European Patent Office
Prior art keywords
coating agent
pump
valve
coating
compressed air
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.)
Pending
Application number
EP21718058.7A
Other languages
German (de)
English (en)
Inventor
Herbert Martin
Erhard Kubach
Manfred Michelfelder
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP4132722A1 publication Critical patent/EP4132722A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B05B9/0409—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 the pumps being driven by a hydraulic or a pneumatic fluid
    • 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
    • B05B12/1481—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 comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/58—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter preventing deposits, drying-out or blockage by recirculating the fluid to be sprayed from upstream of the discharge opening back to the supplying means
    • 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
    • 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
    • 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
    • F04B43/025—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel
    • F04B43/026—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms two or more plate-like pumping members in parallel each plate-like pumping flexible member working in its own pumping chamber
    • 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

Definitions

  • Coating agent pump Coating agent pump, coating system and associated operating process
  • the invention relates to a coating agent pump for conveying a coating agent (e.g. paint) in a coating installation, in particular in a painting installation for painting motor vehicle body components.
  • a coating agent e.g. paint
  • the invention further comprises a corresponding coating installation and an associated operating method.
  • Figure 1 shows a schematic representation of a conventional coating system, which can be used, for example, for painting motor vehicle body components.
  • This known coating system initially has a pig station 1, which supplies an applicator (e.g. rotary atomizer) with coating agent via several piggable supply lines 2.
  • an applicator e.g. rotary atomizer
  • Several central lines 3 run in the pig station 1, only three central lines 3 being shown by way of example in the drawing. Coating agents of different colors can be supplied via the central lines 3.
  • the pig station 1 there are several coating agent valves which make it possible to connect the supply lines 2 on the output side optionally to one of the central lines 3, as is known per se from the prior art.
  • the middle central line 3 of the pig station 1 is connected via a pressure line 4 to a coating agent pump 5, as is known, for example, from DE 10 2013 003 620 A1.
  • the coating agent pump 5 sucks in the coating agent to be applied via a suction line 6 from a paint supply 7, which is only shown schematically here and has a coating agent container.
  • the two other central lines 3 of the pig station 1 are supplied in the same way via pressure lines, as is not shown here for the sake of simplicity.
  • the pig station 1 has a circulation module 8 with circulation connections 9 and circulation valves (not shown). To the circulation connections 9, a circulation line 10 is ruled out, which leads back to the paint supply 7 and enables a circulation operation.
  • the circulation valve Tiles of the circulation module 8 make it possible to connect the central lines 3 of the pig station 1 with the circulation line 10 as required.
  • the pig station 1 also contains a return module 11 with return connections 12 and return valves (not shown).
  • the return module 11 is ruled out to a return line 13, which leads to a dirt thinner receptacle 14 and allows the return of residues of loading coating agent and detergent.
  • the coating agent pump 5 can be designed, for example, in accordance with the laid-open specification DE 10 2013 003 620 A1. This means, among other things, that the coating agent pump 5 is driven pneumatically. For this purpose, a control line 15 opens into the coating agent pump 5.
  • a blow-out line 16 opens into the coating agent pump via a blow-out valve 17 designed as a check valve, as is also already known from DE 10 2013 003 620 A1.
  • the coating agent pump 5 and the pressure line 4 must then be pressed on (i.e. filled) with the new coating agent.
  • This pressing with the new coating agent requires a certain pressing time depending on the length of the pressure line 4 and the viscosity of the coating agent.
  • the pressure time can already be 10-18 seconds.
  • the coating agent pump 5 For the supply of the pig station 1, it is necessary that all components of the coating system are filled with coating agent without bubbles, ie among other things the coating agent pump 5, the pressure line 4, the pig station 1 and the circulation line 10. Depending on the line lengths and the The viscosity of the coating agent results from this different times and a different volume of coating agent that is required to fill the coating system with the coating agent. In the event of a color change, these components are emptied via the coating agent pump 5, for which purpose the coating agent pump 5 has a residual emptying function and an outlet function. Due to the arrangement of the pressure line 4 and the circulation line 10, however, larger amounts of the coating agent remain in the individual components of the coating system.
  • the components of the coating system are then rinsed, for which larger amounts of rinsing agent are required due to the arrangement of the pressure line 4 and the circulation line 10.
  • solvent rinsing agent
  • more coating agent has to be pressed on via the pig station 1 and the return line 13 in order to remove the solvent (rinsing agent) still remaining in the coating system from the components of the coating system and transfer it to the dirt thinner receptacle 14.
  • several pump strokes of, for example, 3-6 pump strokes are required, which leads to an additional loss of coating agent, such as 75 ml per pump stroke, for example.
  • the pressure line 4 and the circulation line 10 must be completely filled with coating agent.
  • the circulation line 10 can only be filled via the pig station 1. This results in correspondingly long lines with an increased line volume and corresponding losses of coating agent.
  • the pressure line 4 and the circulation line 10 are emptied. Due to the process, however, a high proportion of the coating agent remains in the lines. For example, 20% of the coating agent can still remain in the pressure line 4, while even 80% of the coating agent can still remain in the circulation line 10.
  • a residual amount of the rinsing agent remains in the coating agent pump 5 during a rinsing process, since it is not possible to completely remove the rinsing agent from the coating agent pump 5 due to the arrangement of the components of the coating system. This has the consequence that the remaining rinsing agent must be pressed into the return line 13 with the newly pressed coating agent. This increases when filling with the new one Coating agent the loss of coating agent to push the flushing agent back into the return line 13.
  • the pressing time required to press a new coating agent on depends on the viscosity of the coating agent.
  • the coating losses when pressing with a new coating agent also depend on the viscosity of the former coating agent.
  • EP 3725 527 A1 discloses a pump system for supplying a printing press.
  • a coating agent pump in the sense of the invention is not known from this publication.
  • the invention is therefore based on the object of providing a correspondingly improved coating medium pump, a correspondingly improved coating system and an associated operating method.
  • the invention initially comprises a coating agent pump which partially corresponds to the known coating agent pump according to DE 102013003620 A1 described at the outset, so that reference is also made to this publication in order to avoid repetition.
  • the coating agent pump according to the invention is generally suitable for conveying a coating agent, such as, for example, a paint.
  • a coating agent such as, for example, a paint.
  • the invention is not limited to paints, but can in principle also be implemented with other types of coating agents.
  • the coating agent pump according to the invention is preferably adapted for use in a paint shop for painting motor vehicle body components.
  • the coating agent pump according to the invention can in principle also be used in other systems for conveying coating agents.
  • the coating agent pump according to the invention has, in accordance with the above-described known coating agent pump according to DE 10 2013003620 A1, a pump inlet to which the coating agent to be conveyed is fed.
  • the pump inlet of the coating agent pump can be connected to a paint supply via a suction line.
  • the pump inlet of the coating agent pump according to the invention opens inside the coating agent pump into an inlet area which is fed with the coating agent from the pump inlet.
  • the coating agent pump according to the invention in accordance with the known coating agent pump according to DE 102013 003 620 A1 described at the outset, has a pump outlet at which the coating agent to be conveyed is dispensed.
  • the pressure line described at the outset can be connected to the pump outlet.
  • the coating agent pump according to the invention corresponds to the known coating agent pump according to DE 10 2013 003 620 A1 described at the outset.
  • the invention is based on the knowledge that the above-described problems of the known coating system arise from the fact that the circulation line starts from the pig station, since in this way the pressure line and the circulation line are flushed, blown and with a color change over their entire length must be filled with new coating agent.
  • the coating agent pump according to the invention is therefore characterized by an outlet-side circulation connection to which the circulation line can be connected in order to return coating agents to a paint supply when there is a color change. It should be mentioned here that the circulation connection of the coating agent pump is provided in addition to the pump inlet and the pump outlet.
  • the coating agent pump according to the invention thus has at least one further additional connection in addition to the pump inlet and the pump outlet with the circulation connection.
  • This circulation connection is connected to the outlet area of the coating agent pump and is fed with the coating agent to be returned from the outlet area of the coating agent pump.
  • the coating agent pump according to the invention preferably has a controllable circulation valve integrated into the coating agent pump in order to control the coating agent flow from the outlet area of the coating agent pump through the circulation connection into the circulation line.
  • This construction of the coating agent pump according to the invention enables the circulation line to branch off far upstream in front of the pig station, namely directly from the coating agent pump.
  • the coating agent pump additionally has a return connection on the outlet side, which makes it possible to return residues of the coating agent and / or a rinsing agent to a return line that leads into a dirt thinner receptacle.
  • This return connection is provided in addition to the pump outlet, the pump inlet and the circulation connection and is connected to the outlet area of the coating agent pump. The return connection of the coating agent pump is thus fed with the coating agent or flushing agent to be returned from the outlet area of the coating agent pump.
  • the return connection preferably has a controllable return valve integrated into the coating agent pump in order to control the coating agent flow from the outlet area of the coating agent pump through the return connection into the return line to the dirt thinner receptacle.
  • a controllable valve used in the context of the invention is to be distinguished from valves that are operated by their own medium, such as check valves, for example, in which the valve position is determined by the pressure at the inlet and outlet of the valve.
  • controllable valves can be controlled electromagnetically or pneumatically, as is known per se from the prior art.
  • the coating agent pump according to the invention can basically be constructed similarly to the coating agent pump known from DE 10 2013 003 62 A1.
  • the coating agent pump according to the invention is preferably a positive displacement pump which, for example, can be designed as a diaphragm pump and preferably as a double diaphragm pump.
  • the coating agent pump according to the invention preferably has a pump chamber, the inlet area and the outlet area of the coating agent pump being connected to the pumping chamber.
  • a movable displacer for example in the form of a membrane, as is known from DE 102013 003 620 A1.
  • the coating agent pump according to the invention comprises a drive for moving the displacer (e.g. membrane) for pumping the coating agent.
  • this drive can be designed as a pneumatic or electric drive.
  • an inlet valve integrated into the coating agent pump, which is preferably designed as a check valve and releases a coating agent flow from the inlet area into the pump chamber, whereas an opposing coating agent flow from the pump chamber into the inlet area is blocked by the check valve will.
  • a check valve preferably has a tension spring, a valve body (e.g. valve ball) and a valve seat, the tension spring pressing the valve body sealingly into the valve seat in a closed position.
  • the coating agent pump according to the invention preferably has an outlet valve integrated into the coating agent pump between the pump chamber and the pump outlet, the outlet valve likewise preferably being designed as a check valve.
  • This check valve also preferably has a tension spring, a valve body (eg valve ball) and a valve seat, the tension spring pressing the valve body into the valve seat in a closed position in a sealing manner.
  • the coating agent pump according to the invention preferably also has a first blow-out connection which is used to blow out the pump chamber with compressed air.
  • the first Ausblasan circuit therefore preferably opens into the pump chamber, as is already known per se from DE 102013 003 620 A1.
  • the first blow-out connection opens into the pump chamber via the inlet valve designed as a check valve.
  • the coating agent flows in a certain predetermined flow direction through the inlet valve from the inlet area through the inlet valve into the pump chamber of the coating agent pump.
  • the first blow-out connection preferably opens into the inlet valve downstream behind the valve seat. This means that the pump chamber can be blown out via the first blow-out connection while the inlet valve is closed.
  • the first blow-out connection is assigned a first blow-out valve, which is preferably integrated into the coating agent pump and controls the compressed air flow through the first blow-out connection into the pump chamber when blown out.
  • This first blow-out valve is preferably designed as a check valve that releases a flow of compressed air through the first blow-out connection into the pump chamber and blocks an opposing flow of compressed air from the pump chamber through the first blow-out connection.
  • the first blow-out valve it is also possible for the first blow-out valve to be designed as a controllable valve, so that the valve position of the first blow-out valve can then be controlled independently of the pressure conditions at the inlet and the outlet of the first blow-out valve.
  • the coating agent pump preferably additionally has a second blow-out connection on the inlet side in order to blow the coating agent out of the inlet area of the coating agent pump by means of compressed air.
  • the coating agent located in the inlet area of the coating agent pump can be blown back through the pump inlet back to the paint supply by supplying compressed air through the second blow-out connection on the inlet side.
  • a controllable second blow-out valve is preferably assigned to the second blow-out connection, which is preferably integrated into the coating agent pump and controls the compressed air flow through the second blow-out connection into the inlet area of the coating agent pump.
  • the coating agent pump is designed as a double membrane pump and thus has two pump chambers, two inlet valves, two outlet valves and two movably driven membranes, which are each arranged in one of the two pump chambers.
  • two of the first blow-out connections can then be easily seen to blow out one of the two pump chambers.
  • the double diaphragm pump preferably has a pump housing with two opposite housing covers. It is advantageous if the following components are structurally integrated in the two housing covers:
  • One of the two inlet valves, one of the two outlet valves, one of the two first blow-out valves, the circulation valve or the return valve, and / or the two second blow-out valves is one of the two inlet valves, one of the two outlet valves, one of the two first blow-out valves, the circulation valve or the return valve, and / or the two second blow-out valves.
  • the two housing covers are preferably cast parts that are preferably made of stainless steel.
  • the invention also includes a coating system which also contains an optimized arrangement of the circulation line.
  • the coating system according to the invention initially has, in accordance with the known coating systems, a paint supply which provides the coating agent to be applied and contains, for example, a coating agent container.
  • the coating system according to the invention also has a coating agent pump in order to convey the coating agent from the paint supply in the direction of the applicators.
  • the coating agent pump can be designed in the manner according to the invention as described above.
  • the coating agent pump it is also possible for the coating agent pump to be designed in a conventional manner, as is shown, for example, in FIG DE 10 2013003 620 A1 is known.
  • the coating agent pump feeds a pressure line that emanates from the coating agent pump.
  • the coating system according to the invention comprises an extraction point which is connected to the pressure line and is fed with the coating agent from the pressure line.
  • the coating agent flows in a given flow direction from the coating agent pump through the pressure line to the extraction point.
  • the extraction point is designed as a pig station and feeds at least one piggable supply line which starts from the pig station and leads to an application device which applies the coating agent.
  • the extraction point it is not absolutely necessary for the extraction point to have a pig station.
  • the coating system according to the invention also comprises a circulation line which leads back to the paint supply and enables the recovery of coating agent during a rinsing process.
  • the coating system according to the invention is now characterized by a novel arrangement of the circulation line, which no longer starts from the removal point, but rather branches off upstream in front of the removal point with respect to the normal flow direction in the coating operation.
  • This reflects the same inventive concept as in the initially described coating agent pump according to the invention, in which the circulation line branches off directly from the coating agent pump. In both cases (branching of the circulation line directly from the coating agent pump or from the pressure line) the line length of the circulation line is shortened, which reduces the losses in the event of a color change.
  • the circulation line preferably opens directly from the circulation connection of the coating agent pump.
  • the circulation line branches off from the pressure line at a branch point between the extraction point and the coating agent pump.
  • controllable circulation valve in the circulation line for controlling the flow of coating agent through the circulation line. If the circulation line branches off directly from the coating agent pump, this circulation valve is preferably also integrated into the coating agent pump. Otherwise, however, the controllable circulation valve is separate from the coating agent pump.
  • the coating system according to the invention preferably also has a dirt thinner intake, as is known per se from the prior art and is used for receiving and disposing of residues of the coating agent and a rinsing agent.
  • This Schmutzver Plant nerability is preferably fed by a first return line, which leads to the Schmutzver thinner intake.
  • this first return line can branch off from an outlet-side return connection of the coating agent pump, as was already mentioned above in the description of the coating agent pump according to the invention.
  • the first return line branches off between the coating agent pump and the extraction point from the pressure line.
  • the coating system according to the invention preferably also has a second return line which leads from the removal point to the dirt thinner receptacle.
  • the coating system according to the invention can thus have two return lines, the first return line branching off upstream in front of the extraction point, for example directly from an outlet-side return connection of the coating agent pump, while the second return line emanates from the extraction point.
  • a controllable return valve is preferably provided in the first return line in order to control the fluid flow through the first return line into the dirt thinner receptacle.
  • This return valve is preferably integrated into the coating agent pump.
  • this first blow-out connection opens into the pump chamber, preferably via the inlet valve designed as a check valve. It is advantageous if the compressed air supplied via the first blow-out connection presses the valve body of the inlet valve, which is designed as a check valve, into the closed position. The compressed air supplied via the first blow-out connection then contributes to the closure of the inlet valve and reaches the pump chamber in order to blow it out. It is advantageous here if the coating agent pump has at least one first blow-out valve in order to control the flow of compressed air through the first blow-out connection into the pump chamber.
  • This first blow-out valve can be designed, for example, as a check valve that releases a flow of compressed air through the first blow-out connection into the pump chamber, whereas an opposing flow of compressed air from the pump chamber is blocked through the first blow-out connection.
  • a first blow-out line is preferably connected to the first blow-out connection of the coating agent pump in order to blow in compressed air.
  • the coating agent pump according to the invention can have a second exhaust port on the inlet side in order to blow coating agent out of the inlet area of the coating agent pump, the coating agent located therein then being able to be returned to the paint supply through the pump inlet.
  • the flow of compressed air through the second blow-out connection is preferably controlled by a second blow-out valve, as has already been described above.
  • the arrangement of the circulation line according to the invention enables a relatively short line length of the circulation line, which is associated with correspondingly low losses of coating agent.
  • the bypass line can have a line length of at most 2 m, 1 m, 50 cm or 25 cm.
  • the coating agent pump is preferably pneumatically driven with compressed air, the compressed air having a certain drive air pressure, while the coating agent is conveyed with a certain delivery pressure.
  • the coating medium pump preferably enables a transmission ratio between the delivery pressure and the drive air pressure, this transmission ratio being, for example, at least 2: 1, 3: 1 or 4: 1.
  • the coating agent pump according to the invention is preferably a diaphragm pump, such as a double diaphragm pump, for example.
  • the invention is not limited to diaphragm pumps with regard to the type of coating agent pump.
  • the coating agent pump according to the invention preferably has at least one pneumatically driven drive piston, it being possible for two drive pistons to be provided in the case of a double diaphragm pump.
  • the extraction point can be designed as a pig station, for example, and feed several supply lines, each of which leads to an application device (e.g. rotary atomizer) and supplies the respective application device with the coating agent to be applied.
  • an application device e.g. rotary atomizer
  • the extraction point can have at least one compressed air connection and at least one controllable compressed air valve in order to be able to feed compressed air into the pressure line at the extraction point.
  • the compressed air is preferably also fed in here as pulsed air.
  • the extraction point can have a compressed air module which has several compressed air connections and several compressed air valves for the various central lines of the extraction point.
  • the extraction point can have a return connection for connecting the second return line and a controllable return valve for controlling the return.
  • the extraction point can have a return module which has several return connections and several return valves for the various central lines of the extraction point.
  • the extraction point can thus have a plurality of central channels, which are each fed with the coating agent from a pressure line, as has already been briefly described above.
  • the Invention also an associated operating method.
  • the circulation valve is opened in order to be able to return coating agent residues through the circulation line to the paint supply.
  • compressed air e.g. pulsed air
  • the coating agent located in the pressure line is then pushed back along the pressure line by means of compressed air and then returns to the paint supply through the open circulation valve through the circulation line.
  • the return valve of the first return line which branches off either directly from the coating agent pump or between the coating agent pump and the extraction point, can be opened as part of a flushing process in the operating method according to the invention.
  • compressed air e.g. pulsed air
  • the pressure line is then introduced into the pressure line, whereby residual amounts of flushing agent and / or coating agent are pressed from the pressure line and / or from the outlet area of the coating agent pump by means of the compressed air through the first return line into the dirt thinner receptacle.
  • the coating agent located in the pressure line is preferably fed back into the paint supply via the circulation line. Subsequently, residues of the coating agent and possibly of flushing agent are then transferred from the pressure line through the first return line into the dirt thinner receptacle.
  • coating agent residues can still remain in the pump chamber of the coating agent pump during a rinsing process.
  • These coating agent residues can also be at least partially recovered in the context of the operating method according to the invention.
  • the circulation valve is opened in order to enable the return of the coating agent residues through the circulation line to the paint supply.
  • Compressed air e.g. pulsed air
  • the coating agent located in the coating agent pump is then pressed back into the paint supply through the circulation line by means of the supplied compressed air.
  • coating agent residues can also remain in the inlet area of the coating agent pump during a rinsing process. In the context of the operating method according to the invention, these coating agent residues can also be at least partially recovered. For this compressed air is blown through the second blow-out line into the second blow-out connection of the coating agent pump and from there it reaches the inlet area of the coating agent pump. The coating agent located in the inlet area of the coating agent pump can thus be pressed back to the paint supply through the pump inlet by means of the supplied compressed air.
  • the coating agent in the pressure line is blown out through the circulation line and back into the paint supply.
  • the coating agent remaining in the pump chamber is blown out through the circulation line back into the paint supply.
  • the pressure line can therefore have a bidirectional flow.
  • the respective coating agent flows from the coating agent pump through the pressure line to the removal point, from where the coating agent then finally reaches the applicators.
  • the coating agent flows in the opposite direction from the extraction point back to the coating agent pump and from there through the circulation line back into the paint supply.
  • FIG. 1 shows a schematic representation of a conventional coating system as described at the beginning.
  • FIG. 2 shows a schematic representation of a coating system according to the invention in which the circulation line optionally branches off directly from the coating agent pump or from the pressure line between the coating agent pump and the removal point.
  • FIG. 3 shows a modification of FIG. 2 with an additional return line which starts directly from the coating agent pump and leads into a dirt thinner receptacle.
  • FIG. 4 shows a modification of FIG. 3 with an additional blow-out line for blowing out the inlet area of the coating agent pump.
  • FIG. 5 shows a perspective view of the coating agent pump according to the invention.
  • FIG. 6 shows a sectional view of part of the coating agent pump according to FIG. 5.
  • FIG. 7 shows an enlarged view of the coating agent pump from FIGS. 5 and 6 in the area of a housing cover of the pump housing.
  • FIG. 8 shows a flow chart to illustrate the operating method according to the invention.
  • FIGS. 9-11 show further flow charts to illustrate further flushing processes within the scope of the operating method according to the invention.
  • a special feature of the coating system according to the invention according to FIG. 2 is that the circulation line 10 or 10 ′ does not start from the pig station 1, but rather branches off upstream in front of the pig station 1 with regard to the normal flow direction in the coating operation.
  • the drawings show two variants of the line routing of the circulation line 10 and 10 '.
  • the circulation line 10 branches off at a branch point from the pressure line 4, the branch point being formed by a circulation valve 18'.
  • a relatively short line length
  • circulation line 10 branches off directly from the coating agent pump 5, which for this purpose has a separate circulation connection, as will be described in detail below.
  • the circulation line 10 or 10 'in both variants of the invention has a significantly shorter line length than in the known coating system according to FIG are conducted, whereby coating losses are reduced.
  • the pig station 1 has a compressed air module 19 with several compressed air connections 20 instead of the return module 8.
  • Compressed air lines can be connected to the compressed air connections 20 in order to introduce compressed air into the central lines 3 of the pig station 1.
  • compressed air is introduced into the pressure line 4
  • the coating agent located in the pressure line 4 is then pressed back into the paint supply 7 via the circulation line 10 or 10 'and thus recovered.
  • the exemplary embodiment according to FIG. 3 largely corresponds to the exemplary embodiment according to FIG 2, so that in order to avoid repetition, reference is made to the above description of FIG. 2, the same reference numerals being used for corresponding details.
  • a special feature of this exemplary embodiment is that a return line 21 branches off from the coating agent pump 5 and opens into the dirt thinner receptacle 14. In the return line 21 there is a controllable return valve 22 which controls the fluid flow through the return line 21 into the dirt thinner receptacle 14.
  • residues of the coating agent or flushing agent remaining in the pressure line 4 can be blown out through the return line 21 into the dirt thinner receptacle 14.
  • the return valve 22 is opened. Compressed air is then blown into the pressure line 4 at the compressed air module 19 of the pig station 1, the compressed air then blowing the residues of coating agent and flushing agent out of the pressure line 4 via the return line 21 into the dirt thinner receptacle 14.
  • the exemplary embodiment according to FIG. 4 largely corresponds to the exemplary embodiment according to FIG. 3, so that in order to avoid repetition, reference is made to the above description of FIG. 3, the same reference numerals being used for corresponding details.
  • a special feature of this exemplary embodiment is that a further blow-out line 23 is also provided, which opens into the inlet area of the coating agent pump 5, where a controllable blow-out valve 24 is arranged in the blow-out line 23.
  • the blow-out line 23 can be used to blow the coating agent remaining in the inlet area of the coating agent pump 5 out of the coating agent pump 5 through the suction line 6 back into the paint supply 7 process can be recovered.
  • the blow-off valve 24 is simply opened, whereupon compressed air is blown into the inlet area of the coating agent pump 5.
  • the blown compressed air then displaces the coating agent located in the inlet area of the coating agent pump 5, which leaves the coating agent pump 5 via the pump inlet and the suction line 6 against the normal flow direction during the coating operation and returns to the paint supply 7.
  • Figures 5-7 show different views of the coating agent pump 5 according to the invention.
  • the coating agent pump five initially has a pump inlet 25 which draws the coating agent to be conveyed from the paint supply 7 via the suction line 6, the coating agent flowing in the direction of the arrow through the pump inlet 25 into the coating agent pump 5.
  • the drawn-in coating agent then passes from the pump inlet 25 into an inlet area 26 of the coating agent pump 5.
  • the coating agent pump 5 On the outlet side, the coating agent pump 5 has a pump outlet 27 to which the pressure line 4 is connected, the coating agent flowing in the direction of the arrow through the pump outlet 27 from the coating agent pump 5.
  • the pump outlet 27 is fed with the coating agent to be conveyed from an outlet region 28.
  • an inlet valve 31 which controls the flow of coating agent from the inlet area 26 into the pump chamber 29, so that the coating agent flows in the direction of the arrow from the inlet area 26 into the pump chamber 29.
  • the inlet valve 31 is designed as a check valve and consists essentially of a valve ball 32, a valve seat 33 and a return spring 34, the return spring 34 pressing the valve ball 32 into the valve seat 33 in a sealing manner.
  • the inlet valve 31 thus allows only one loading Layering agent flow from the inlet region 26 in the direction of the arrow into the pump chamber 29, where, on the other hand, an opposing coating agent flow is blocked by the inlet valve 31 against the direction of the arrow.
  • an outlet valve 35 is arranged, which controls the flow of coating agent from the pump chamber 29 into the outlet area 28 in the direction of the arrow.
  • the outlet valve 35 is also designed as a check valve and consists of a return spring 36, a valve ball 37 and a valve seat 38, the return spring 36 pressing the valve ball 37 into the valve seat 38 in a sealing manner.
  • the coating agent pump 5 has a circulation connection 39, the circulation line 10 being connected to the circulation connection 39, which is shown in the variant of the invention according to FIGS. 2-4 with solid lines.
  • a controllable circulation valve 40 is integrated into the circulation connection 39, which can optionally enable or block the circulation connection 39.
  • the coating agent pump 5 has two blow-out connections 41, 42, the blow-out connection 41 serving to blow out the pump chamber 29, while the blow-out connection 42 serves to blow out the opposite, not shown, pump chamber.
  • the blow-out connection 41 opens into the inlet valve 31, downstream behind the valve seat 33 with respect to the normal flow direction in coating operation the valve seat 33 pushes.
  • the inlet valve 31 is then closed and the compressed air can penetrate through the blow-out connection 41 into the pump chamber 29 in order to blow it out.
  • the opposite blow port 42 functions with respect to the other pump chamber in the same way.
  • the coating agent pump 5 has two blow-out connections 43, 44, which are connected to the inlet area 26 and enable coating agent located in the inlet area 26 to be blown out through the pump inlet 25 and returned to the paint supply 7. Compressed air is also supplied through the blow-out connections 43, 44 in the direction of the arrow. The coating agent located in the inlet region 26 is then pressed against the direction of the arrow in FIG. 5 through the pump inlet 25 back to the paint supply 7.
  • the coating agent pump 5 has a separate return connection 45, which is connected to the return line 21, which leads to the dirt thinner receptacle 14.
  • the return connection 45 is connected to the outlet area 28 of the coating agent pump 5. Residues of the coating agent and flushing agent can be blown out of the pressure line 4 via the return connection 45. For this purpose, compressed air is blown into the pressure line 4 at the pig station 1. As a result, the residues of the coating agent and the rinsing agent in the pressure line 4 are pressed against the normal flow direction into the outlet area 28 of the coating agent pump 5 and then leave the coating agent pump 5 through the return connection 45 to the dirt thinner receptacle 14.
  • the coating agent pump 5 has an essentially cylindrical pump housing 46 with two lateral housing covers 47, 48.
  • the two blow-out connections 41, 43 and the circulation connection 39 with the circulation valve 40, the inlet valve 31 and the outlet valve 35 are integrated in the housing cover 47.
  • blow-out connections 42, 44 and the return connection 45 together with the inlet and outlet valves located there are integrated in the opposite housing cover 48.
  • the two housing covers 47, 48 each consist of stainless steel and are cast parts.
  • a first step S1 the circulation valve 18 is first opened so that the coating agent remaining in the pressure line 4 can be fed back into the paint supply 7 through the circulation line 10.
  • compressed air is fed into the pressure line 4 at the pig station 1 in a step S2.
  • This compressed air presses the coating agent located in the pressure line 4 through the open circulation valve 18 and through the circulation line 10 back into the paint supply 7, so that this portion of the coating agent is recovered and no loss of coating agent is produced.
  • FIG. 9 The flowchart according to FIG. 9 is now described below, which likewise illustrates part of a flushing process.
  • the residues of coating agent and rinsing agent in the pressure line 4 are disposed of.
  • the return valve 22 in the return line 21 is first opened in a step S1.
  • step S2 compressed air is then fed into the pressure line 4 again at the pig station 1. This compressed air then presses the residues of the coating agent and the flushing agent located in the pressure line 4 first into the outlet area 28 of the coating agent pump 5 and there via the open return valve 22 and the return line 21 into the dirt thinner receptacle 14.
  • FIG. 10 illustrates a further part of a flushing process.
  • the coating agent located in the pump chamber 29 of the coating agent pump 5 is partially recovered.
  • the circulation valve 18 is first opened in a first step S1.
  • step S2 compressed air is then again blown into the coating agent pump 5 via the blow-out connections 41, 42.
  • This compressed air penetrates into the pump chamber 29 or into the opposite, second pump chamber and initially presses the coating agent located therein into the outlet area 28 of the coating agent pump 5 and from there through the circulation connection 39 into the circulation line 10 and back into the paint supply 7. In this way, part of the coating agent remaining in the pump chamber 29 can to be recovered.
  • FIG. 11 The flowchart according to FIG. 11 is now described below, which likewise illustrates part of a flushing process.
  • the coating agent that is located in the inlet area 26 of the coating agent pump 5 is partially recovered.
  • a first step S1 compressed air is blown through the second blow-out connection 43 or 44 into the inlet region 26 of the coating agent pump 5.
  • a second step S2 the compressed air blown in then presses the residues of the coating agent remaining in the inlet area 26 through the pump inlet 25 and the suction line 6 back into the paint supply 7.
  • the rinsing processes according to FIGS. 8-11 are preferably carried out one after the other, preferably in the following order:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L'invention concerne une pompe pour agent de revêtement (5) destinée au transport d'un agent de revêtement dans une installation de revêtement, comprenant une entrée de pompe (25), une zone d'entrée (26), une sortie de pompe (27) et une zone de sortie (28). La pompe pour agent de revêtement comprend en outre un raccord de recirculation (39) sur le côté sortie, destiné à l'évacuation de l'agent de revêtement dans une conduite de recirculation (10) en retour vers une alimentation en encre. L'invention concerne également une installation de revêtement comprenant une telle pompe pour agent de revêtement (5). En outre, un procédé de fonctionnement d'une installation de revêtement est divulgué, dans lequel l'agent de revêtement dans la conduite de pression (4) est renvoyé dans l'alimentation en encre (7) par introduction d'air comprimé dans la conduite de pression (4) et par ouverture d'une soupape de recirculation (18) disposée sur la liaison de recirculation (39).
EP21718058.7A 2020-04-09 2021-04-06 Pompe pour agent de revêtement, installation de revêtement et procédé de fonctionnement associé Pending EP4132722A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020109973.8A DE102020109973A1 (de) 2020-04-09 2020-04-09 Beschichtungsmittelpumpe, Beschichtungsanlage und zugehöriges Betriebsverfahren
PCT/EP2021/058845 WO2021204748A1 (fr) 2020-04-09 2021-04-06 Pompe pour agent de revêtement, installation de revêtement et procédé de fonctionnement associé

Publications (1)

Publication Number Publication Date
EP4132722A1 true EP4132722A1 (fr) 2023-02-15

Family

ID=75478016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21718058.7A Pending EP4132722A1 (fr) 2020-04-09 2021-04-06 Pompe pour agent de revêtement, installation de revêtement et procédé de fonctionnement associé

Country Status (8)

Country Link
US (1) US20230158525A1 (fr)
EP (1) EP4132722A1 (fr)
KR (1) KR20220160011A (fr)
CN (1) CN115348899A (fr)
DE (1) DE102020109973A1 (fr)
MX (1) MX2022012538A (fr)
WO (1) WO2021204748A1 (fr)
ZA (1) ZA202210212B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113351396A (zh) * 2021-07-14 2021-09-07 东莞市金隆机械设备有限公司 一种喷涂供漆回收利用系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10140216B4 (de) * 2001-08-17 2006-02-09 ITW Oberflächentechnik GmbH & Co. KG Verfahren und Vorrichtung an einer Lackiereinrichtung zum Reinigen einer Lack-Förderleitung
DE10225681B4 (de) * 2002-06-10 2010-02-04 Windmöller & Hölscher Kg Verfahren und Vorrichtung zum Zu- und Abführen von Druckfarbe zu und von einer Rakelvorrichtung eines Farbwerks einer Rotationsdruckmaschine und/oder zum Reinigen der Rakelvorrichtung
DE102006041677B4 (de) * 2006-09-06 2019-05-29 Eisenmann Se System zur Reinigung von medienführenden Wegen in einer Beschichtungsanlage
DE102012022836B3 (de) 2012-11-23 2014-05-22 Eisenmann Ag Schlauchpumpe und Applikationssystem mit einer solchen
DE102013000362B4 (de) 2013-01-10 2021-08-05 Man Truck & Bus Se Fahrerhauslagerung
DE102013003620B4 (de) 2013-02-18 2016-02-04 Dürr Systems GmbH Beschichtungsmittelpumpe und Reinigungsverfahren für eine Beschichtungsmittelpumpe
DE102017126651B4 (de) 2017-11-13 2021-05-27 Timmer Gmbh Pumpeinrichtung mit über einem gemeinsamen Antrieb gekoppelten Pumpen
EP3725527B1 (fr) 2019-04-19 2022-03-30 Sheng-Tsung Lee Système distributeur de fluide

Also Published As

Publication number Publication date
CN115348899A (zh) 2022-11-15
US20230158525A1 (en) 2023-05-25
DE102020109973A1 (de) 2021-10-14
WO2021204748A1 (fr) 2021-10-14
ZA202210212B (en) 2024-01-31
MX2022012538A (es) 2022-12-13
KR20220160011A (ko) 2022-12-05

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