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EP4067651B1 - Soupape de dosage de chambre, système de dosage associé et procédé de distribution dosée d'un milieu visqueux - Google Patents

Soupape de dosage de chambre, système de dosage associé et procédé de distribution dosée d'un milieu visqueux Download PDF

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Publication number
EP4067651B1
EP4067651B1 EP21166328.1A EP21166328A EP4067651B1 EP 4067651 B1 EP4067651 B1 EP 4067651B1 EP 21166328 A EP21166328 A EP 21166328A EP 4067651 B1 EP4067651 B1 EP 4067651B1
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EP
European Patent Office
Prior art keywords
media
chamber
metering
medium
valve
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EP21166328.1A
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German (de)
English (en)
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EP4067651C0 (fr
EP4067651A1 (fr
Inventor
Tobias Faaß
Karl Andreas Robert Straß
Thomas Kehrle-Fischer
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D and P Dosier & Prueftechnik GmbH
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D and P Dosier & Prueftechnik GmbH
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Publication of EP4067651B1 publication Critical patent/EP4067651B1/fr
Publication of EP4067651C0 publication Critical patent/EP4067651C0/fr
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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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the present invention relates to a chamber dosing valve for the metered dispensing of a viscous medium according to the preamble of claim 1, an associated dosing system and a method for the metered dispensing of a viscous medium according to the preamble of claim 15.
  • the invention relates to a chamber dosing valve and a method for the finely metered dispensing of a viscous medium in small quantities, such as the dispensing of lubricants, adhesives, sealants and the like.
  • the process media to be dosed include, for example, oils, varnishes, lubricants such as greases, resins, silicones, adhesives, sealants, gels, pastes, liquid polymers, casting compounds and pasty substances used in pharmaceutical, food technology or general industrial processing.
  • oils, varnishes, lubricants such as greases, resins, silicones, adhesives, sealants, gels, pastes, liquid polymers, casting compounds and pasty substances used in pharmaceutical, food technology or general industrial processing.
  • the media to be dosed and the user scenarios are characterized by a wide variety of parameters, resulting, for example, from the variety of applications, the characteristic material properties of the media to be applied, their supply, the prevailing media and ambient conditions during storage and application (e.g., temperature and humidity), the applied and required process pressures, the chemical reaction behavior and the potential corrosive effects of the media, and above all, their viscosity. Further complicating factors are the requirement to supply the media with repeatable accuracy and as uninterruptedly as possible in a wide variety of quantities or volumes, in a controlled and finely dosed manner.
  • dosing valves or dosing units — Various solutions for dosing systems — generally referred to as dosing valves or dosing units — are known from the state of the art, which can handle fluids of different types apply from one or more existing components.
  • Dosing systems for small-volume dosing of liquids and media of low viscosity are known. These are designed as syringe-like, single-chamber systems in various sizes, flow rates, and implementations.
  • the mostly liquid dosing materials are applied with pinpoint accuracy via a longitudinal movement of a piston, for example, via hollow needles.
  • Such dosing systems are known and used primarily in process engineering equipment, for the controlled filling of mostly liquid media and mixtures into special containers.
  • Their application environment is determined, for example, by the requirements of filling technology, process-engineering media supply, or use in a laboratory environment.
  • the application area is being expanded with the use of comparable single-chamber systems in assembly technology, which also allows for the application of small quantities of various process media, some of which have higher viscosity.
  • Current representative examples include syringe and small-quantity dosing in electrical and electronic encapsulation, the application of oily lubricants, and the application of reactants and process media in adhesive and sealing technology.
  • Such single-chamber dosing systems comprise, for example, a dosing unit and a drive unit that are connected to apply a medium from the dosing unit.
  • the dosing unit comprises at least one media inlet, through which the medium is supplied to the dosing unit under pressure, and a media outlet, via which the medium is discharged from the dosing unit.
  • the dosing unit has a media chamber with a media inlet and a media outlet, through which the medium enters the chamber and is discharged again from it.
  • the media chamber comprises a dosing piston that is movable by means of the drive unit between a backward movement, during which the medium enters the chamber, and an advancing movement to discharge the medium through the media outlet.
  • a piston similar to a syringe is pulled, which sucks the lubricant into the chamber, and pressing the piston expels the lubricant.
  • This has the advantage that dosing can take place independently of pressure.
  • the disadvantage is that even with larger chamber volumes, the lubricant must be refilled, which means an interruption of approximately 30 seconds in the process. If, for example, a part needs to be moistened with lubricant in a manufacturing process, the production process must be interrupted for the corresponding loading time to load the chamber dosing valve. For example, one cycle must be interrupted every 10 cycles to reload the lubricant into the chamber.
  • a further disadvantage of the chamber dosing valve is that continuous lubricating grease dispensing is not possible due to the loading process. Longer lubricant distances, for example the application of lubricant beads, are therefore impossible.
  • Another system known in the prior art is a dispenser that operates in the manner of an extruder. This system is not suitable for less viscous media, as it would otherwise operate very imprecisely. Furthermore, the system is very pressure-sensitive and can only be used at a maximum of 15 bar. Furthermore, the stator is susceptible to wear. However, unlike the conventional chamber-type metering valves, the dispenser allows for continuous and uniform dispensing of lubricating grease (subject to the limitations described above).
  • US 2018/0030966 A1 describes a dispensing device for a grease gun.
  • the dispensing head has two plungers that are alternately moved back and forth by a single cam member and two opposing coil springs, thereby feeding the grease from the reservoir to the hose of the grease gun.
  • the cam member rotates around a rotation axis that runs parallel to the longitudinal axes of the plungers.
  • the drive must be arranged longitudinally accordingly, so the device is quite large.
  • a further objective is to provide a method for the metered delivery of a viscous medium, with the delivery being able to occur continuously and with low pulsation.
  • the object of the invention is achieved by a chamber metering valve for the metered dispensing of a viscous medium according to claim 1, a metering system according to claim 13, and a method for the metered dispensing of a viscous medium according to claim 15.
  • a chamber metering valve for the metered dispensing of a viscous medium according to claim 1 a metering system according to claim 13, and a method for the metered dispensing of a viscous medium according to claim 15.
  • a chamber metering valve for the metered dispensing of a viscous medium comprises a metering unit and a drive unit that are connected to one another.
  • the metering unit has at least one media inlet, at which the medium is supplied to the metering unit under pressure.
  • the metering unit also has a media outlet, via which the medium is dispensed from the chamber metering valve.
  • the metering unit further has a first media chamber that includes a media inlet and a media outlet, as well as a metering needle.
  • the metering needle is movable in an oscillating manner between a forward movement, referred to as a metering position, and a backward movement, referred to as a loading position.
  • the medium is pressed into the media chamber due to the pressure applied to the media inlet.
  • the medium is discharged from the media chamber via the media outlet.
  • the dosing unit further comprises at least one second media chamber with a media inlet, a media outlet, and a dosing needle.
  • the media outlets of the first and the at least one second media chamber open into the media outlet of the dosing unit.
  • only a single common media outlet is present, which is connected to the media outlets of the media chambers.
  • the first and second media chambers are preferably structurally identical, but their designs may differ depending on the specific structural requirements of the chamber dosing valve.
  • each of the dosing needles of the media chambers is coupled to a cam disk arranged on a common rotation axis.
  • at least two cam disks are provided—in the case of a two-chamber dosing valve.
  • more chambers and thus more cam discs are present in chamber dosing valves with more than two chambers, such as three chambers with three cam discs on a common rotation axis in a three-chamber dosing valve.
  • the rotation axis is coupled to the drive unit, so that when the rotation axis rotates, the dosing needles, via their coupling to the respective cam disc, can each oscillate between the forward movement (the dosing position) and the backward movement (the loading position).
  • the at least two cam discs are shaped and arranged offset from one another on the rotation axis such that essentially a forward movement of a first dosing needle occurs while a backward movement of a second dosing needle occurs, so that a continuous discharge of the medium from the chamber dosing valve takes place.
  • the forward movements of the first and second media chamber alternate, and at any time during the dosing process, medium is pressed from one of the media chambers for discharge from the chamber dosing valve into the media outlet - dosing takes place continuously.
  • the metering valve according to the invention can also have more than two chambers.
  • Those skilled in the art will be able to adapt the device accordingly and, for example, arrange the cam discs offset by 120° on the rotation axis, instead of a 180° offset arrangement in a two-chamber system.
  • the chamber dosing valve can advantageously be designed in a modular manner, with the drive unit forming a first module and the dosing unit forming a second module, for example. All components of the dosing unit, such as the at least two media chambers with the associated dosing needles, the media inlet, the media outlet, the rotation axis with the cam discs, etc., can be housed in a single modular element, for example.
  • the present invention provides a method for the continuous and low-pulsation dosing of a viscous medium using a chamber dosing valve.
  • a chamber dosing valve as described above can advantageously be used to implement the method.
  • the medium is supplied to the chamber metering valve under pressure via a delivery unit.
  • a delivery unit For this purpose, an inlet pressure of at least 10 bar (1 MPa) to a maximum of 50 bar (5 MPa) can be used.
  • the chamber metering valve contains a medium chamber with a metering needle, which between a forward movement as the dosing position and a backward movement as the loading position.
  • the delivery unit pushes the medium through a media inlet into the media chamber, and during the forward movement, the dosing needle pushes the medium through a media outlet from the media chamber into a media outlet of the chamber dosing valve, through which the medium leaves the chamber dosing valve.
  • At least two media chambers are provided, the dosing needles of which are each moved between the dosing position and the loading position via a rotating cam disk, for which purpose the cam disks are arranged on a common axis of rotation.
  • the cam disks are shaped and arranged offset from one another on the axis of rotation such that the dosing position of the first dosing needle essentially alternates with the dosing position of the second dosing needle, and a first dosing needle executes a forward movement while a second dosing needle executes a reverse movement. Due to such an opposing movement of the dosing needles, medium is pressed from one of the media chambers into the media outlet at any time during the dosing process, whereby the medium is dosed continuously and with little pulsation from the chamber dosing valve.
  • the cam discs are designed, for example, as eccentrics. If the at least two media chambers are arranged parallel to one another, these eccentrics can, for example, be arranged rotated relative to one another on the axis of rotation in order to enable the forward movement of a first dispensing needle to alternate with the forward movement of a second dispensing needle.
  • the offset of the cam disc along the axis of rotation results from the structural distance between the dispensing needles or the media chambers.
  • the rotational movement of the cam discs is converted into a linear movement of the dispensing needles and the at least two dispensing needles can be moved back and forth in the media chambers in a coordinated manner.
  • the media flow can be controlled and continuously maintained.
  • a viscous medium can be dispensed in fine doses, and the dispensed quantity is reliably reproducible.
  • the asynchronous oscillating movement of at least two metering needles enables continuous and precise delivery of the medium.
  • the chamber metering valve can have a small, compact design with few components.
  • pump and conveyor technology media is pumped from a storage container and, for example, introduced into a pipe system. Dosing is not possible with such systems. It is important to note that in pump and conveyor technology, in accordance with the requirements placed on it, a suction pressure is built up when the piston is retracted. This suction pressure draws the medium from the container. The medium is then discharged, for example, into a pipe system. This is different with the present invention. Upstream of the metering valve according to the invention, the medium must be pumped from the storage container using a pump or similar conveying system and made available with pressure on the inlet side of the metering valve.
  • the invention lies in the ability to expel the medium already in the system from the system.
  • conveying technology the medium is introduced into the system, and in dosing technology, the medium is discharged from the system in a controlled manner.
  • dosing valve it is important that the medium is supplied reliably and at a constant pressure in a system, e.g., a pipe system.
  • the focus is on metered, locally limited, or precisely dosed dispensing, i.e., the dispensing of a defined quantity.
  • This device enables sensitively adjustable small-quantity dosing, even of higher-viscosity lubricants.
  • Media with higher viscosity pose various problems. Dosing is more difficult because high pressures of at least 10 bar must be applied, and even with such media, the media dispensing must be stopped and started quickly. Sealing against material leakage is particularly important. For uninterrupted dosing, the viscous grease flow must be kept flowing continuously. For controlled, sensitively adjustable grease dosing, small sizes and small dead spaces are required, as well as an integrated dosing valve with extremely small chamber volumes.
  • Controlled dosing of small quantities requires special precautions: The dosing quantity can be adjusted more sensitively the smaller the supply chambers in the pistons are selected and the more directly they are controlled. However, in order to be able to dose larger quantities of media, the drive design must be such that high rotational speeds are utilized on the drive side and induced vibrations are avoided.
  • cam design maintains constant feed rates, that a short, consistent piston movement occurs during load changes, and that smooth tangential transitions are achieved in the cam design, as provided for in the particularly preferred version.
  • the camshaft is controlled directly using the smallest axes.
  • the direct connection to the engine ensures the smallest rise and fall times and allows for highly dynamic control.
  • the present invention offers numerous advantages, some of which have already been explained above.
  • the metering valve is low-maintenance and very compact. Continuous metering is possible, as one chamber is filled and simultaneously ejected from the other chamber. This allows for the application of grease beads, essentially a continuous application of grease. However, selective dispensing of the lubricant is also possible. This depends entirely on the operation of the system.
  • the metering needles are preloaded toward the cam discs by a spring.
  • the needles are always pressed against a circumferential contour of the cam discs, and the needles are coupled to the cam disc.
  • a compression spring can be used, for example, which is supported on one side by a coupling end of the metering needle facing the cam disc and on the other side by the media chamber or a housing of the chamber metering valve. The spring ensures continuous drive transmission between the cam disc and the metering needle.
  • the dispensing needles can also be pushed through the medium against the cam disc, which flows under pressure into the media chamber as soon as the dosing needle begins to move backwards.
  • the dispensing needle can have a roller at its coupling end that rolls against the circumferential contour of the cam disc. As the cam disc rotates, the roller rolls smoothly along the circumferential contour and transfers the drive movement of the cam disc to the dispensing needle, either for extruding the medium from the media chamber during the dispensing position or for releasing the chamber volume to fill the media chamber during the loading position.
  • the dispensing needles are preferably mounted in the media chambers without torque.
  • a seal package and/or bearings can be provided, for example.
  • the drive unit is designed as an electric motor.
  • the electric motor can be coupled to the rotational axis via its output shaft directly or indirectly, e.g., via a belt. Electric motors are compact and can generate high speeds.
  • the motor is advantageously designed as a modular unit and can be mounted directly on the metering unit.
  • a check valve can be provided at the media inlet to the media chamber, preventing backflow from the media chamber into the supplying conveying system. Therefore, any medium that has been filled into the media chamber is discharged exclusively via the chamber's media outlet.
  • a control valve preferably a check valve, is advantageously provided in each media outlet of each individual chamber, which prevents a backflow into the respective media chamber during an advancing movement of the dosing needle of an adjacent chamber or during a backward movement of the dosing needle of this chamber.
  • the media volumes from all media chambers are fed into a common media outlet.
  • the medium is ejected into a common channel by each piston, also called a tappet, in this case usually referred to as a dosing needle.
  • each piston also called a tappet, in this case usually referred to as a dosing needle.
  • the lubricating grease or other medium in the system is drawn into the piston chamber, in this case usually referred to as the media chamber, by one piston, while the other piston is in ejection mode and ejects the medium again.
  • the ejection by both pistons takes place into one and the same outlet channel and flows into the common media outlet.
  • the cam disk is designed so that the ejection interval of both pistons overlaps.
  • cam disks also known as cams
  • the overall ejection is completely uninterrupted, i.e. not just with low pulsation, but pulsation-free. It has been shown that with exact alternating operation, i.e. when one piston is in the loading interval while the other is in the ejection interval, although low-pulsation dosing is possible, a lubricating grease bead of exactly the same thickness or width cannot be ejected. Instead, slight deviations in the amount of lubricating grease have been observed, i.e. the bead becomes somewhat uneven. By creating an overlap interval, this problem is eliminated; shortly before the piston currently in the ejection interval ends its ejection activity, the second piston already begins its ejection interval.
  • the check valves and control valves mentioned above prevent carryover or run-on in the outlet, which can be a problem, especially with viscous media introduced at high working pressures.
  • the shut-off valve at the media outlet is particularly important, as it promotes run-on and drip-free media dosing.
  • This multi-chamber metering valve has various advantages, some of which have already been mentioned above.
  • the cam disk design described above results in even more advantages, namely: No referencing is necessary. It is completely irrelevant what state the system is in when it is stopped; it can simply continue. It also makes no difference whether an identical amount of lubricant is to be dispensed in each cycle or whether, for example, a program is to be run in which, for example, two individual drops are to be dispensed alternately and then a short distance is to be metered continuously. None of this is important for this system, as it is completely reference-free. It is an endless system. The system can be restarted at any point. Even if the emergency stop is activated, the system can simply be restarted again.
  • the common media outlet may have a check valve or a control valve, preferably a check valve, for regulating the discharge of the medium from the chamber dosing valve and in particular for preventing backflow into lines and channels of the dosing valve leading to the common media outlet.
  • the check valves in the media inlets, the control valves or check valves in the media outlets and in the media outlet can together form a valve system for regulating the continuous media flow and thus the applied media quantity.
  • the chamber metering valve according to the invention is particularly well suited for ointment-like and viscous, so-called pasty media, such as lubricants.
  • lubricating greases with a consistency that falls into classes 000 to 3 according to the NLGI (National Lubrication Grease Institution) classification system can be metered (see also DIN 21 818).
  • Gear greases for example, fall into the NLGI consistency classes 000, 00, 0, and 1, whereas rolling bearing greases and plain bearing greases fall into classes 2 and 3 (as well as 4).
  • the media chambers advantageously have a maximum volume of 5,000 mm 3 , in particular of 1,000 mm 3 , preferably of 500 mm 3 , even more preferably of 200 mm 3 or less.
  • the media chambers are advantageously designed as elongated cylinders in order to achieve an advantageous stroke length of the dosing needles.
  • control valve or check valve in the media outlets is designed such that a minimum pressure in the media chamber of 30 bar, preferably 35 bar, and particularly preferably over 40 bar, is required to open the control valve or check valve. These pressures ensure that sufficient thrust is present to continuously press medium into the media outlet and to release a defined amount of medium from the chamber metering valve.
  • the dosing unit has a guide sleeve for each dosing needle to guide the oscillating movement of the dosing needle.
  • at least two, preferably at least three, independent sealing devices are provided in the guide sleeve to seal between the media chamber and the dosing needle.
  • the sealing devices can be formed, for example, by sealing rings that are held by the guide sleeve and form a contact surface for the dosing needle.
  • the at least two sealing devices form a sealing package that reliably prevents uncontrolled leakage of medium from the media chamber.
  • three O-ring seals are provided in each media chamber. Their combination in series ensures the required high level of tightness of the system under the demanding process requirements described here, especially the high working pressures.
  • the complete seal package is mounted in a sleeve and simultaneously serves to guide the dispensing needle.
  • the medium in the media chambers can be tempered by means of a heating and/or cooling device.
  • the temperature of the medium in the chambers can thus be adjusted to the requirements for a defined and reproducible discharge of the medium from the chamber metering valve.
  • a dosing system which comprises a chamber dosing valve as described above and a control unit for the chamber metering valve.
  • a rotational speed of the rotational axis can be set; the check valves, metering valves, and/or control valves can be controlled, e.g., depending on an applied pressure; a temperature for the media chambers can be determined, and/or the medium pressure at the media inlet can be adjusted.
  • the chamber metering valve can be controlled depending on the viscosity of a medium, so that a reproducible dispensing of a preset amount of media can be variably determined within a defined time window.
  • FIGS. 1 to 9 An embodiment of a chamber metering valve and a method for the continuous and low-pulsation metering of a viscous medium using such a chamber metering valve according to the invention are presented.
  • the embodiment shown is particularly well suited for the metering and application of Lubricants such as greases, as used in machine, automation, and process technology.
  • a chamber metering valve according to the invention can also be used to meter oils, as well as for almost solid, highly viscous, and sticky media.
  • Figure 10 a particularly preferred design of a cam disc is shown, as it can preferably be used in a chamber dosing valve 100.
  • the dosing unit 2 has a media inlet 3 for supplying the chamber dosing valve 100 with a medium to be applied from a reservoir (not shown) and a media outlet 4 for continuously dispensing the medium from the chamber dosing valve 100. Connections for an alternative media inlet 3' and an alternative media outlet 4' are provided in order to be able to accommodate the structural conditions at the site of use if necessary.
  • the dosing unit 2 has a first media chamber 5 and a second media chamber 6, which are aligned parallel to one another in a housing of the dosing unit 2.
  • the media chambers 5 and 6 each have a media inlet 7 and 7', respectively, and a media outlet 8 and 8', respectively.
  • each media chamber has a dosing needle that is displaceably mounted in the chamber, i.e. a first dosing needle 9 in the first media chamber 5 and a second dosing needle 10 in the second media chamber 6.
  • the dosing needles 9 and 10 each have a feed end 11, 11' and a coupling end 12, 12'.
  • Coupling sleeves 13, 13' are firmly attached to the coupling end 12, 12' of the dosing needles 9 and 10, which serve as bearings for rollers 14, 14' at the end of the dosing needles 9 and 10.
  • a spiral spring 15, 15' is provided for each dosing needle 9 and 10, which is clamped between the coupling end 12, 12' of the dosing needles and a housing-fixed stop 16, 16'.
  • the spiral springs 15, 15' clamp the dosing needles 9 and 10 in the loading position, ie in Figure 1 to the left, forward.
  • a check valve is provided in each of the media inlets 7 and 7' leading to the media chambers 5 and 6, respectively.
  • the check valve 17 is located in the media inlet 7', which prevents the medium from flowing back from the media chamber toward the reservoir.
  • a similar check valve is also provided in the media inlet 7.
  • control valve or check valve 18 is provided in each media outlet 8 or 8', which prevents backflow into the respective media chamber and regulates the outlet of the medium from the respective media chamber.
  • a control or check valve 19 is provided in the common media outlet 4, into which the media outlets 8 and 8' open (see Figure 5 ), which supports the fine dosing of the media application.
  • the check valves and control valves prevent carryover or overflow at the media outlet and the media outlets, which can be particularly problematic with viscous media that are fed at high working pressures.
  • the valve at the media outlet in particular, prevents overflow and drip-free media dosing.
  • the coupling ends 12 of the dispensing needles 9 and 10 are aligned in the direction of a rotational axis 20 and perpendicular to it.
  • the rotational axis 20 is rotatably mounted in bearings 21 and 21' in the housing of the dispensing unit 2.
  • a first cam disc 22 which interacts with the first dispensing needle 9, and a second cam disc 23, which interacts with the second dispensing needle 10, which rotate together with the rotational axis 20.
  • the cam discs 22 and 23 are mounted eccentrically, rotated by 180° relative to one another, and offset longitudinally on the rotational axis 20.
  • the rotational axis 20 and the cam discs 22 and 23 together form a type of camshaft, which acts on the dispensing needles 9 and 10 of the media chambers 5 and 6.
  • the dispensing needles 9 and 10 with their respective rollers 14, rest against a circumferential contour 24 and 24', respectively, of the cam discs 22 and 23, with the rollers 14 being pressed against the circumferential contours 24 and 24', respectively, by the compression springs 15.
  • the dispensing needles 9 and 10 are thus coupled to the cam discs 22 and 23 via the rollers 14.
  • the rotation axis 20, is coupled to the drive unit 1 so that it can be driven in rotation by the latter.
  • the dosing unit 2 has a guide sleeve 30, 30' for each of the dosing needles 9 and 10 to guide a movement of the dosing needles 9 and 10, which are respectively connected to the media chambers 5 and 6.
  • the guide sleeves 30, 30' serve to support the dosing needles in a torque-free manner.
  • each guide sleeve 30, 30' contains three seals 31, 33, 34 or 31, 33' and 35', which form a gap between the dispensing needle and Seal the media chamber.
  • the seals 31, 31', 33, 33', 35, 35' for example sealing rings such as O-rings, are arranged separately from one another in the guide sleeve 30 and 30', respectively, and thus each form an independent seal. These seals together form a seal package for sealing the media chamber and the dispensing needle.
  • the combination of the seals 31, 33, 35 and 31', 33', 35' arranged in series ensures the required high level of tightness for demanding process requirements.
  • a vent 32, 32' e.g. a vent valve
  • the dispensing needles 9 and 10 of the dispensing unit 2 are movably driven by the drive unit 1 by a rotation of the rotation axis 20, oscillating between a forward movement as a dispensing position and a backward movement as a loading position.
  • the rotation axis 20 is in turn driven by the drive unit 1.
  • the two cam discs 22 and 23 are shaped and arranged offset from one another on the rotation axis 20 in such a way that essentially a forward movement of the first dispensing needle 9 occurs during a backward movement of a second dispensing needle 10, so that a continuous dispensing of the medium from the chamber dispensing valve takes place.
  • the loading position i.e.
  • Figure 8 shows a three-dimensional partial section of the chamber dosing valve with the rotation axis 20, which carries the first cam disc 22 and the second cam disc 23, and the dosing needles 9 and 10 as well as their coupling by means of the rollers 14 to the cam discs 22 and 23.
  • the drive unit is designed as an electric motor 50.
  • the electric motor 50 comprises an output shaft 51, which protrudes outwardly from a housing of the electric motor 50.
  • a support plate 54 is attached to the housing, on which a first drum 52 and a second drum 53 are rotatably mounted offset from the first drum 52.
  • the first drum 52 can be coupled to the output shaft 51 and the second drum 53 can be coupled to the rotation axis 20 of the dosing unit 2.
  • a transmission belt 55 is placed around the first drum 52 and the second drum 53 so that rotation of the output shaft 51 can be transmitted via the first drum 52 and the belt 55 to the second drum 53 and thus to the rotation axis 20.
  • a cover 56 can be attached over the drums 52 and 53 as well as the belt 55.
  • a control unit can be provided on the chamber dosing valve or remotely therefrom, which, for example, controls the drive unit and the valves of the chamber dosing valve.
  • a device for heating and/or cooling the medium in the media chambers can be provided, which can also be controlled via the control unit.
  • the media chambers are preferably machined from an aluminum block. Any accompanying heating or cooling is quickly transferred to the medium through the aluminum.
  • cam disk 22 is described.
  • the cam disks 22, 23 are identically constructed. However, they are arranged offset along the longitudinal axis of the rotation axis 20 according to the distance between the media chambers 5 and 6.
  • the cam disks 22 and 23 are also provided rotated by 180° on the rotation axis 20.
  • the circumferential contour 24 has various sections, which divide the rotation of the cam disc around the rotation axis 20 into different rotation phases.
  • the individual rotation phases can be distinguished from one another based on their geometric design.
  • the main sections can be a forward sector 40 for the forward movement and a return sector 41 for the backward movement of the dispensing needle.
  • the forward sector 40 extends from the low point 45, which can also be regarded as the starting point of a movement cycle of a dispensing needle, to the high point 44.
  • the return sector 41 extends from the high point 44 to the low point 45.
  • a circumferential contour section of the advance sector 40 differs from a circumferential contour section of the return sector 41 in such a way that the advance movement lasts longer than the return movement - the path of the advance sector 40 is longer than the path of the return sector 41.
  • an overlap sector 42 results, in which both dispensing needles 9 and 10 execute a feed movement simultaneously for a short period of time.
  • the two dispensing needles 9 and 10 move briefly in the same direction.
  • one cam disc has already begun the feed movement by crossing the low point 45, while the other cam disc is at the end of the feed movement, in the overlap sector 42. This prevents a dead center during the media dispensing during the reversal of the movement.
  • the circumferential contour 24 can be divided into different sections, which can be distinguished based on their geometric properties.
  • the advance sector 40 extends from the low point 45 to the high point 44.
  • the circumferential contour 24 is a straight line - reference numeral 43. This is followed by a large section in the shape of an Archimedean spiral - reference numeral 46. In this section, the path length of the cam disc is directly proportional to the path of the dispensing needle. Towards the high point 44, there is a transition radius from the advance 40 to the return 41 - the overlap sector 42.
  • the return sector 41 extends from the high point 44 to the low point 45. For the most part, this is a simple radius. Immediately before the low point 45, another radius is provided—the transition radius from the return to the forward point 47.
  • the circumferential contour in the main part of the advance sector 40 is advantageously designed in a spiral shape (section 46). This means that the radius continuously increases from the beginning of the advance phase to the end of the advance phase.
  • a radius of the circumferential contour in the return sector 41 can be oval. This means that the radius increases from the beginning of the return phase to the middle of this phase and then decreases again until the end of the return phase. This results in a symmetrical change in the radius around the middle of the return phase.
  • Figure 10 illustrates the special shape of the cam disks 22 and 23 mounted on the rotation axis 20 in a preferred embodiment of a chamber metering valve 100 according to the invention.
  • the circumferential contour 24, 24' of the cam disks is largely spiral-shaped, and in the return sector 41, a continuously increasing radius is provided such that the circumferential contour 24, 24' forms a kind of semi-oval.
  • This shape results in a largely counter-rotating movement of the metering needles 9 and 10, whereby the emptying and refilling of each media chamber 5 and 6 takes place alternately in a single revolution of the rotation axis 20.
  • the circumferential contour 24, 24' in the transition sectors 42 and 47 is shaped in such a way that an overlapping area of the movement of both dispensing needles results, in which a targeted, short-term, co-directional advance movement of the dispensing needles in the media chambers occurs.
  • the advance phase starts via the advance sector 40, which leads to the forward movement of the dispensing needle in the media chamber and thus to its emptying. This is followed by the aforementioned overlap sector 42 at the end of the advance sector 40.
  • a return phase starts via the return sector 41, during which a backward movement of the dispensing needle in the media chamber occurs and this is refilled with medium from the reservoir.
  • the cycle ends when the low point 45 is reached.
  • the tangentially executed transition area 47 leads back via the low point 45 as the starting point of the movement to the straight line 43 as the initial path of the cycle.

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Claims (15)

  1. Soupape de dosage de chambre (100) pour la distribution dosée d'un milieu visqueux avec une unité de dosage (2) et une unité d'entraînement (1), qui sont reliées l'une à l'autre,
    dans laquelle l'unité de dosage (2) comprend au moins une entrée de milieu (3), sur laquelle le milieu est amené à l'unité de dosage de manière sollicitée avec une pression, et une sortie de milieu (4), par l'intermédiaire de laquelle le milieu est distribué à partir de la soupape de dosage de chambre,
    dans laquelle l'unité de dosage comprend une chambre de milieu (5) avec un orifice d'entrée de milieu (7) et un orifice de sortie de milieu (8),
    dans laquelle la chambre de milieu (5) comprend une aiguille de dosage (9), qui est mobile de manière oscillante entre un mouvement d'avance en tant que position de dosage et un mouvement de recul en tant que position de chargement,
    dans laquelle lors du mouvement de recul de l'aiguille de dosage (9) le milieu est pressé dans la chambre de milieu (5) en raison de la pression appliquée sur l'entrée de milieu (3),
    dans laquelle l'unité de dosage comprend au moins deux chambres de milieu (5, 6) avec un orifice d'entrée de milieu (7, 7') et un orifice de sortie de milieu (8, 8'),
    dans laquelle les orifices de sortie de milieu (8, 8') des au moins deux chambres de milieu (5, 6) débouchent dans la sortie de milieu (4) de l'unité de dosage,
    caractérisée en ce que
    chaque chambre de milieu (5, 6) comprend une aiguille de dosage (9, 10), qui est accouplée respectivement à une came (22, 23), et les cames (22, 23) sont disposées sur un axe de rotation (20) commun, lequel est accouplé à l'unité d'entraînement (1), de sorte que lors de la rotation de l'axe de rotation (20) les aiguilles de dosage (9, 10) sont mobiles respectivement de manière oscillante entre le mouvement d'avance en tant que position de dosage et le mouvement de recul en tant que position de chargement,
    dans laquelle les au moins deux cames (22, 23) sont formées et disposées de manière décalée l'une de l'autre sur l'axe de rotation (20) de telle sorte que sensiblement un mouvement d'avance d'une première aiguille de dosage (9) s'effectue pendant un mouvement de recul d'une deuxième aiguille de dosage (10), de sorte qu'une distribution continue du milieu à partir de la soupape de dosage de chambre s'effectue.
  2. Soupape de dosage de chambre (100) selon la revendication 1,
    caractérisée en ce que
    les aiguilles de dosage (9, 10) sont précontraintes dans la direction des cames (22, 23) au moyen d'un ressort (15).
  3. Soupape de dosage de chambre (100) selon la revendication 1 ou 2,
    caractérisée en ce que
    les aiguilles de dosage (9, 10) présentent sur une extrémité d'accouplement (12) un galet (14), qui s'appliquent en roulant sur un contour périphérique (24, 24') d'une came (22, 23).
  4. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'unité d'entraînement est réalisée sous la forme d'un moteur électrique, qui entraîne l'axe de rotation directement ou indirectement.
  5. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    un clapet antiretour (17), qui empêche un reflux à partir de la chambre de milieu (5, 6), est prévu sur l'orifice d'entrée de milieu (7, 7') menant à la chambre de milieu (5, 6).
  6. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    les orifices de sortie de milieu (8, 8') débouchent à partir des chambres de milieu (5, 6) dans une sortie de milieu (4) commune à partir de l'unité de dosage (2) et une soupape de réglage ou un clapet antiretour (18), qui empêche un reflux dans la chambre de milieu (5, 6) respective, est prévu(e) dans chaque orifice de sortie de milieu (8, 8').
  7. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    un clapet antiretour (19) ou une soupape de réglage est disposé(e) dans la zone de la sortie de milieu (4) commune.
  8. Soupape de dosage de chambre (100) selon la revendication 6 ou 7,
    caractérisée en ce que
    la soupape de réglage ou le clapet antiretour (18) est réalisé(e) de telle sorte qu'une pression minimale dans la chambre de milieu de 30 bar, de préférence 35 bar, de manière particulièrement préférée 40 bar, est nécessaire pour ouvrir la soupape de réglage ou le clapet antiretour (18).
  9. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    l'unité de dosage (2) présente pour chaque aiguille de dosage (9, 10) une douille de guidage (30) pour le guidage du mouvement oscillant de l'aiguille de dosage (9, 10), dans laquelle respectivement au moins deux dispositifs d'étanchéité indépendants l'un de l'autre sont prévus pour l'étanchéification entre la chambre de milieu (5, 6) et l'aiguille de dosage (9, 10).
  10. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    chaque chambre de milieu (5, 6) présente un volume maximal de 5000 mm3, en particulier de 1000 mm3, de préférence de 500 mm3, de préférence encore de 200 mm3 ou moins.
  11. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    le milieu dans les chambres de milieu (5, 6) peut être thermorégulé au moyen d'un élément de chauffage ou de refroidissement.
  12. Soupape de dosage de chambre (100) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que
    un contour périphérique (24, 24') des cames (22, 23) présente un secteur de marche avant pour le mouvement d'avance et un secteur de marche arrière pour le mouvement de recul du piston de poussée, dans laquelle une section de contour du secteur de marche avant se différencie d'une section de contour du secteur de marche arrière, de telle sorte que le mouvement d'avance dure plus longtemps que le mouvement de recul.
  13. Système de dosage, comprenant une soupape de dosage de chambre (100) selon la revendication 1 et une unité de commande pour la soupape de dosage de chambre.
  14. Système de dosage selon la revendication précédente,
    caractérisé en ce que
    l'unité de commande commande une vitesse de rotation de l'axe de rotation (20) et/ou les clapets antiretour (17), soupapes de dosage (19) et/ou soupapes de réglage (18) en fonction d'une pression appliquée, en particulier en fonction de la viscosité d'un milieu.
  15. Procédé pour le dosage continu et faible en pulsations d'un milieu visqueux à l'aide d'une soupape de dosage de chambre (100),
    dans lequel le milieu est amené sous pression à la soupape de dosage de chambre par l'intermédiaire d'une unité de transport,
    dans lequel une chambre de milieu (5) dans la soupape de dosage de chambre présente une aiguille de dosage (9), laquelle est déplacée entre un mouvement d'avance sous la forme d'une position de dosage et un mouvement de recul sous la forme d'une position de chargement,
    dans lequel pendant le mouvement de recul de l'aiguille de dosage (9) l'unité de transport presse le milieu dans la chambre de milieu (5) et pendant le mouvement d'avance l'aiguille de dosage (9) presse le milieu à partir de la chambre de milieu (5) dans une sortie de milieu (4), par l'intermédiaire de laquelle le milieu quitte la soupape de dosage de chambre,
    caractérisé en ce que
    au moins deux chambres de milieu (5, 6) sont prévues, dont les aiguilles de dosage (9, 10) sont déplacées respectivement par l'intermédiaire d'une came (22, 23) disposée sur un axe de rotation (20) commun entre la position de dosage et la position de chargement,
    dans lequel les cames (22, 23) sont formées et disposées de manière décalée l'une de l'autre sur l'axe de rotation (20) de telle sorte que la position de dosage d'une première aiguille de dosage (9) alterne sensiblement avec la position de chargement d'une deuxième aiguille de dosage (10),
    de sorte qu'à chaque instant du procédé de dosage le milieu est pressé à partir d'une des chambres de milieu (5, 6) dans la sortie de milieu (4),
    ce qui a pour effet que le milieu est dosé à partir de la soupape de dosage de chambre en continu et avec peu d'impulsions.
EP21166328.1A 2021-03-31 2021-03-31 Soupape de dosage de chambre, système de dosage associé et procédé de distribution dosée d'un milieu visqueux Active EP4067651B1 (fr)

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EP21166328.1A EP4067651B1 (fr) 2021-03-31 2021-03-31 Soupape de dosage de chambre, système de dosage associé et procédé de distribution dosée d'un milieu visqueux

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Publication number Priority date Publication date Assignee Title
DE2127976A1 (de) * 1970-06-13 1971-12-23 Ismatec SA, Zurich (Schweiz) Dosier Kolbenpumpe
US10941762B2 (en) * 2015-01-30 2021-03-09 Wagner Spray Tech Corporation Piston limit sensing and software control for fluid application
GB201502686D0 (en) * 2015-02-18 2015-04-01 Finishing Brands Uk Ltd High pressure pump
US20180030966A1 (en) * 2016-07-28 2018-02-01 Jelley Technology Co., Ltd. Device of grease gun
US10550997B2 (en) * 2016-09-23 2020-02-04 FD Johnson Company Lubrication pump

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