EP0768463A1 - Pompe doseuse - Google Patents

Pompe doseuse Download PDF

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Publication number
EP0768463A1
EP0768463A1 EP96116155A EP96116155A EP0768463A1 EP 0768463 A1 EP0768463 A1 EP 0768463A1 EP 96116155 A EP96116155 A EP 96116155A EP 96116155 A EP96116155 A EP 96116155A EP 0768463 A1 EP0768463 A1 EP 0768463A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve body
dosing pump
housing
dosing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96116155A
Other languages
German (de)
English (en)
Other versions
EP0768463B1 (fr
Inventor
Wolfgang Ress
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.)
Wolfgang Eichler GmbH and Co KG
Original Assignee
Wolfgang Eichler GmbH and Co KG
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 Wolfgang Eichler GmbH and Co KG filed Critical Wolfgang Eichler GmbH and Co KG
Publication of EP0768463A1 publication Critical patent/EP0768463A1/fr
Application granted granted Critical
Publication of EP0768463B1 publication Critical patent/EP0768463B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting

Definitions

  • the invention relates to a metering pump with a metering chamber acted upon by a displacer, a suction line and a pressure line, both of which are valve-controlled, and with a degassing valve which is arranged in the installation at the highest point of the metering chamber and whose valve body is in a closed position during the suction stroke an opening position during the pressure stroke can only be moved if gaseous medium is present at the degassing valve.
  • a certain amount of the metering medium is dispensed with each stroke of the displacer.
  • this metering quantity can also be set, for example by changing the stroke of the displacer. Malfunctions can occur if a gaseous medium is enclosed in the metering chamber, which is compressed during the pressure stroke, so that either the amount delivered falls below the setpoint of the metered amount or the metering is completely suspended because the entire displacement stroke is used up by the compression of the enclosed gaseous medium.
  • the gaseous medium can be air, which occurs, for example, in the event of manipulations on the suction side of the pump, e.g. if the container containing the dosing medium is replaced, or it is a gas dispersed or dissolved in the dosing medium that escapes during operation and leads to the above-mentioned faults in the dosing pump.
  • Degassing valves have therefore already been proposed for metering pumps (DE 41 18 600, DE 42 19 664, DE 42 41 030), which are structurally very complex and consist of a large number of moving parts, with the result that their function is also susceptible are. This applies in particular when viscous media have to be dosed.
  • the design effort is in particular carried out in order to avoid that the dosing medium itself also exits via the degassing valve during degassing or immediately thereafter. If this happens at a point in time when the valve in the pressure line has already opened, the metering quantity is falsified.
  • the degassing is to take place without overflow of the dosing medium and the closing of the degassing valve during the suction stroke by means of two valves connected in series, a simple check valve serving to close during the suction stroke, while the actual degassing valve is a diaphragm valve, which has an elaborately shaped valve membrane and several valve seats.
  • a simple check valve serving to close during the suction stroke
  • the actual degassing valve is a diaphragm valve, which has an elaborately shaped valve membrane and several valve seats.
  • malfunctions occur, particularly with dosing media of higher viscosity.
  • the invention has for its object to provide a structurally simple degassing valve in a metering pump of the structure mentioned above, which ensures perfect functioning even with the smallest metered quantities and regardless of the viscosity of the metering medium.
  • valve body is guided in a housing between two valve seats and the guide forms a throttle section for the liquid dosing medium.
  • the design according to the invention initially has the advantage that, similar to a double-acting non-return valve, there is only a single valve body which interacts on opposite sides with one valve seat each.
  • This valve body is not freely movable in the valve housing, but is guided, the guide, for example a guide gap, being designed such that a gaseous medium lifts the valve body from the valve seat with only minimal compression during the pressure stroke, but then through the guide or flows out of the guide gap.
  • the guide for example a guide gap
  • valve body is designed as a cylinder and is guided with little play in a cylinder guide of the housing and has the sealing surfaces interacting with the valve seats on both end faces.
  • the throttle section is determined by the annular gap of the cylinder guide.
  • the valve body and the cylinder guide can be tolerated very precisely as turned parts and thus the response sensitivity can be precisely predetermined.
  • valve body has conical sealing surfaces on its end faces, the two valve seats being formed by elastic round cord rings.
  • valve seat and valve body enables a high contact pressure and thus a reliable seal to be created. This guarantees perfect functioning even with the smallest dosing quantities and low-viscosity dosing media.
  • the valve body of the degassing valve is under an adjustable preload.
  • This version is particularly recommended for higher viscosity dosing media to support the closing movement of the degassing valve during the suction stroke.
  • the preload in the case of such highly viscous media does not interfere with the closing process of the degassing valve after the enclosed gas has flowed out, since the flow resistance when the medium passes into the guide gap becomes very high and the valve body is suddenly pushed against the closing valve seat by the dynamic pressure.
  • the preload is an adjustable compression spring that acts on the end face of the valve body via a tappet.
  • the size of the preload given by the compression spring can be adapted in this way to the viscosity of the dosing medium.
  • the compression spring with the plunger and its guide are arranged in an adjustment housing which can be placed on the metering pump and which has a radial bore for the escaping gas and possibly escaping metering medium.
  • the setting housing is cylindrical on the outside and is provided on a cylindrical surface with an annular channel adjoining the radial bore, an outlet with a return line for the metering medium adjoining the ring channel can be rotatably fitted on the adjusting housing.
  • the adjustment housing with the drain and the return line can be brought into any rotational position with respect to the metering pump, so that, depending on the installation position of the metering pump, any metering medium that may overflow can be returned in a suitable manner into the media container via the return line, which is preferably a hose.
  • the metering pump 1 has the metering housing 2 with the metering chamber 3, which is on one side by the displacer 4, e.g. a membrane is complete.
  • a suction line 5 is arranged in the metering housing 2 and is connected to the container containing the metering medium via a suction valve 6 in the manner of a check valve and a hose line (not shown). The suction line 5 opens into the metering chamber 3.
  • the metering housing 2 has a pressure line 7 attached to the metering chamber 3, which is connected to the consumption point via a pressure valve 8.
  • Both the suction valve 6 and the pressure valve 8 are designed as one-way check valves. For safety reasons, two such valves are connected in series.
  • the metering housing 2 has an upwardly increasing ventilation channel 9, to which a ventilation valve 10 is connected. Finally, an adjustment housing 11 sits on the vent valve 10.
  • the vent valve 10 is shown in more detail in Figure 2. It has a housing 12, which has an external thread 13 and is screwed into the metering housing in a gastight and liquid-tight manner by means of a seal 14. In the housing 12, a cylindrical sleeve 15 is inserted, which serves as a guide for the likewise cylindrical valve body 16.
  • the valve body 16 has conical sealing surfaces 17, 18 on its two end faces, each of which cooperates with a valve seat 19, 20 designed as an O-ring.
  • valve body 16 rests with its lower conical surface 18 on the lower circular ring 20 and is pressed in a sealing manner during the suction stroke of the membrane 4.
  • valve 8 of the pressure line 7 is closed during the suction stroke.
  • the intake valve 6 again closes and the valve 8 opens.
  • the valve body 16 of the degassing valve 10 is pressed in a sealing manner against the upper round cord ring 9.
  • a gaseous medium for example air or degassing products of the dosing medium
  • this gaseous medium either rises automatically via the degassing line 9 to the degassing valve 10 or is driven there during the pressure stroke.
  • the gas As soon as the gas is compressed slightly, it lifts the valve body 16 from the lower valve seat 20 and flows out in the guide gap between the sleeve 15 and the valve body 16.
  • a sufficiently high dynamic pressure cannot yet build up in order to urge the valve body 16 against the upper valve seat 19.
  • the dynamic pressure suddenly rises and moves the valve body 16 against the upper valve seat, so that the upper conical surface 17 seals against the O-ring 19. Only with a further increase of the dynamic pressure then opens the pressure valve 8 in the pressure line 7.
  • the housing 12 of the degassing valve 10 has at its upper end a threaded connector 21, onto which the adjustment housing 11 is screwed.
  • a compression spring 22 which acts on a plunger 23 guided in the housing 11.
  • This guide advantageously has a larger play than the guide of the valve body 16 in the bushing 15 of the degassing valve.
  • the plunger 23 bears against the valve body 16 under the force of the compression spring 22 (FIG. 1), thus pushing it into the lower closed position.
  • the spring force is adjustable via an adjusting screw 24.
  • the adjustment housing 11 has a radial bore 25 which opens into an annular channel 27 on the cylindrical circumference of the housing extension 26.
  • An outlet 28 is rotatably mounted on the housing attachment 26, but is liquid-tight, to which a hose line for returning any escaping dosing medium is connected via a nipple 29.
  • the drain 28 is rotatably mounted on the housing extension 26, so that the hose nipple 29 can be set in any rotational position, but due to the annular channel 27, a return of any dosing medium that may be exceeded is always ensured.
EP96116155A 1995-10-13 1996-10-09 Pompe doseuse Expired - Lifetime EP0768463B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19538134 1995-10-13
DE19538134A DE19538134A1 (de) 1995-10-13 1995-10-13 Dosierpumpe

Publications (2)

Publication Number Publication Date
EP0768463A1 true EP0768463A1 (fr) 1997-04-16
EP0768463B1 EP0768463B1 (fr) 1999-08-04

Family

ID=7774754

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116155A Expired - Lifetime EP0768463B1 (fr) 1995-10-13 1996-10-09 Pompe doseuse

Country Status (3)

Country Link
EP (1) EP0768463B1 (fr)
AT (1) ATE182960T1 (fr)
DE (2) DE19538134A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934878A1 (fr) * 2008-08-08 2010-02-12 Rolland Versini Moto pompe a ecoulement axial.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB995919A (en) * 1962-07-27 1965-06-23 Stuart Grahame Ross Air bleed valve
DE1808390A1 (de) * 1967-11-20 1969-06-12 Glutz Blotzheim Nachfolger Ag Elektromagnetische Schwingankerpumpe
EP0168656A1 (fr) * 1984-06-27 1986-01-22 Nikkiso Eiko Co., Ltd. Dispositif de dégazage automatique dans une pompe à mouvement alternatif
DE4219663A1 (de) * 1992-06-16 1993-12-23 Prominent Dosiertechnik Gmbh Flüssigkeits-Dosierpumpe
DE4219664A1 (de) * 1992-06-16 1993-12-23 Prominent Dosiertechnik Gmbh Fördereinheit für eine Verdrängerdosierpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB995919A (en) * 1962-07-27 1965-06-23 Stuart Grahame Ross Air bleed valve
DE1808390A1 (de) * 1967-11-20 1969-06-12 Glutz Blotzheim Nachfolger Ag Elektromagnetische Schwingankerpumpe
EP0168656A1 (fr) * 1984-06-27 1986-01-22 Nikkiso Eiko Co., Ltd. Dispositif de dégazage automatique dans une pompe à mouvement alternatif
DE4219663A1 (de) * 1992-06-16 1993-12-23 Prominent Dosiertechnik Gmbh Flüssigkeits-Dosierpumpe
DE4219664A1 (de) * 1992-06-16 1993-12-23 Prominent Dosiertechnik Gmbh Fördereinheit für eine Verdrängerdosierpumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2934878A1 (fr) * 2008-08-08 2010-02-12 Rolland Versini Moto pompe a ecoulement axial.

Also Published As

Publication number Publication date
DE19538134A1 (de) 1997-04-17
DE59602602D1 (de) 1999-09-09
ATE182960T1 (de) 1999-08-15
EP0768463B1 (fr) 1999-08-04

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