WO2019201884A1 - Pompe avec chambre de produit - Google Patents

Pompe avec chambre de produit Download PDF

Info

Publication number
WO2019201884A1
WO2019201884A1 PCT/EP2019/059730 EP2019059730W WO2019201884A1 WO 2019201884 A1 WO2019201884 A1 WO 2019201884A1 EP 2019059730 W EP2019059730 W EP 2019059730W WO 2019201884 A1 WO2019201884 A1 WO 2019201884A1
Authority
WO
WIPO (PCT)
Prior art keywords
chamber
product
pump
sealing
pressure
Prior art date
Application number
PCT/EP2019/059730
Other languages
German (de)
English (en)
Inventor
Christoph Schmid
Original Assignee
Henkel Ag & Co. Kgaa
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 Henkel Ag & Co. Kgaa filed Critical Henkel Ag & Co. Kgaa
Publication of WO2019201884A1 publication Critical patent/WO2019201884A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps

Definitions

  • the invention relates to a pump with at least one product chamber for a product to be pumped, wherein the pump can be designed in particular as a rotor pump. Furthermore, the invention relates to the use of the pump.
  • rotor pumps are used to pump fluids such as
  • rotor pumps such as rotary or rotary piston pumps
  • Radial piston pumps, centrifugal pumps and eccentric rotor pumps are typically made of stainless steel and may be chrome plated, for example. Through the use of stainless steel and possibly the
  • Coating is given very good chemical and mechanical compatibility, for example to all adhesives, so that rotor pumps can be used for a variety of fluids to be pumped.
  • the invention is therefore based on the object to provide a pump with which problematic adhesives such as cyanoacrylates and anaerobic acrylates can be pumped, with an inadvertent curing of the adhesive is prevented within the pump.
  • a pump having a product chamber for a product to be pumped, the pump further comprising at least two sealing chambers.
  • a first sealing chamber is formed as a barrier chamber filled with a barrier fluid and sealed by a first seal against the product chamber.
  • a second sealing chamber is formed as filled with a pressure medium pressure chamber and sealed by a second seal against the first sealing chamber. Between the product chamber and the pressure chamber pressure compensation means are provided, so that a pressure difference between the product chamber and the pressure chamber is substantially equal to zero.
  • the pump thus comprises at least two sealing chambers. However, it may also comprise more than two sealing chambers, so that, for example, more than a first sealing chamber or more than a second sealing chamber or one or more further sealing chambers are provided. In the following, however, it is assumed in the description of a pump with two sealing chambers.
  • the pump has the advantage that due to the pressure equalization taking place between the product chamber and the pressure chamber and the resulting virtually nonexistent pressure difference between the product chamber and the pressure chamber, no leakage occurs on the first seal and on the second seal. Thus, it is effectively prevented that the product to be pumped through the first seal in the first sealing chamber and optionally from there also in the second sealing chamber crossing and there undesirably cured.
  • the pump is therefore particularly suitable for pumping cyanoacrylates or anaerobic acrylates. In addition, it is also suitable for pumping other products, but the particularly good sealing effect of the arrangement with two sealing chambers means that even problematic products can be pumped with it.
  • the pump may in particular be designed as a rotor pump and have a shaft which is guided through the product chamber and through the at least two sealing chambers, wherein the first seal and the second seal are formed as shaft seals, through which the shaft is guided.
  • the second sealing chamber may for example be sealed against the environment by means of a third shaft sealing ring. Leakage typically occurs at this third shaft seal, since it is sealed against the generated compressed air pressure, ie, relative to the environment Overpressure in the second sealing chamber, and compressed air escapes due to the sliding seal to the outside.
  • the shaft is vertical or substantially vertical, and the sealing chambers are above the product chamber, i. at a higher level than that
  • a substantially vertical course of the shaft is understood here and below to mean that the shaft forms an angle of not more than 20 ° with the vertical.
  • This embodiment has the advantage that leakage is particularly effectively prevented, in particular at the first seal, because gravity acts to assist.
  • the pressure compensation means are designed as a compensation reservoir.
  • the balancing reservoir is hydraulically with both the product chamber and with the
  • the compensation reservoir thus contains on the one hand the product to be pumped, on the other hand compressed air, the level of the product stored in the compensation reservoir being equal to the volume of the fluid contained in the second sealing chamber, i. the pressure chamber, and the
  • Balancing reservoir This in turn increases the pressure of the compressed air, so that a preferably continuous pressure equalization is achieved.
  • a level control can be carried out by compensating the compressed air leakage by supplying external compressed air.
  • the compressed air supply of the product reservoir is used. Due to the static and dynamic pressure loss of the product supply, this compressed air pressure is always minimally greater than the product pressure at the pump inlet. This will be a
  • Level control of the product in the balancing reservoir is possible because the product is conveyed back to the product reservoir in the product supply line.
  • the product level in the compensation reservoir can be monitored in particular by means of a sensor.
  • a sensor for this purpose, for example, a capacitive sensor can be used.
  • the sensor may in particular have a switching output and control a control valve, that the
  • Level control executes by supplying compressed air.
  • the compensation reservoir can in particular be connected via a control valve with a compressed air supply to a supply of external compressed air for a level control in
  • the compressed air supply can in particular be the compressed air supply of the product reservoir.
  • the control valve can be designed in particular as a 3/2-way valve. As a control valve, in particular a solenoid valve can be used.
  • the described pump is used for pumping cyanoacrylates. It may be advantageous if a solvent for cyanoacrylates is used as barrier liquid in the first sealing chamber. In this case, no curing of the product takes place in the first sealing chamber, even if, exceptionally, a certain leakage should occur at the first seal.
  • such a barrier liquid has such a low viscosity that without
  • This barrier liquid prevents the whereabouts and the ingress of moisture and prevents the penetration and curing of the product.
  • the described pump is used for pumping anaerobic acrylates.
  • a cutting oil can be used as a barrier liquid.
  • This barrier liquid reduces friction, dissipates frictional heat and prevents penetration and curing of the product.
  • FIG. 1 schematically shows a diagram of a pump according to an embodiment of the invention
  • FIG. 2 shows a first side view of the pump according to FIG. 1;
  • FIG. 3 shows a first sectional view of the pump according to FIG. 1;
  • FIG. 4 shows a second side view of the pump according to FIG. 1 and FIG.
  • FIG. 5 shows a second sectional view of the pump according to FIG. 1.
  • 1 shows a schematic diagram of a pump 1 for a product to be pumped, wherein the pump 1 is particularly suitable for pumping cyanoacrylates or anaerobic acrylates.
  • the pump 1 is designed as a rotor pump and has a shaft 2 with a longitudinal axis L.
  • the longitudinal axis L is at the same time the axis of rotation of the shaft 2.
  • the shaft 2 passes through a product chamber 3 and promotes product located in the product chamber 3.
  • the product 5 is also kept outside the product chamber 3 in a product reservoir 4, which is connected to the product chamber 3 by a supply line 11.
  • the product 5 is under pressure, by a compressed air supply 20, which via a
  • Pressure regulator 19 is connected to the product reservoir 4, is maintained.
  • the product pressure in the pump 1 is typically between 0 and 7 bar, preferably between 0.5 and 4 bar.
  • the product chamber 3 is sealed by means of shaft sealing rings. To be a particularly good
  • three shaft sealing rings are provided, which are arranged one behind the other in the direction of the longitudinal axis L about the shaft 2: a first shaft seal 6, a second
  • the first sealing chamber 9 is designed as a barrier chamber and filled with a barrier liquid.
  • the barrier liquid is selected to match the product to be pumped in the product chamber 3.
  • the barrier liquid preferably has a viscosity in the range from 1 mPas to 15,000 mPas, very particularly preferably in the range from 6 mPas to 5,000 mPas. If a cyanoacrylate is kept in the product chamber 3, a solvent for cyanoacrylates is used as the barrier liquid, for example the solvent sold under the name Sicomet D-Bonder with a viscosity of 6 mPas.
  • a cutting oil for example Loctite LB 8030 with a viscosity of 170 mPas, is particularly suitable as a barrier liquid.
  • the barrier liquid has the task of displacing moisture from the first sealing chamber and / or reducing friction and dissipating frictional heat, as well as preventing the hardening of small quantities of product entering the first sealing chamber.
  • the second sealing chamber 10 is formed.
  • the second sealing chamber 10 is designed as a pressure chamber and filled with a pressure medium, in the embodiment shown compressed air.
  • the second sealing chamber is sealed by means of the third shaft sealing ring 8.
  • the pressure medium has the task of maintaining the same pressure in the second sealing chamber 10 and thus on the second sealing ring 7, which also prevails in the product chamber 3.
  • a compensation reservoir 12 is provided as pressure compensation means between the
  • the compensation reservoir 12 is connected via a connecting line 13 to the product chamber 3, so that product 5 can enter the compensation reservoir 12.
  • the compensation reservoir 12 via a
  • first shaft seal 6 is used for pressure-free sealing between the product chamber 3 and the first sealing chamber 9.
  • the second shaft seal 7 serves for pressure-free sealing between the first sealing chamber 9 and the second sealing chamber 10.
  • the third shaft seal 8 serves for pressurized sealing between the second sealing chamber 10 and the environment.
  • the product level in the compensation reservoir 12 is monitored by means of a sensor 16, in particular a capacitive sensor with switching output. If the product level rises above a specified limit, level control is performed by balancing the compressed air leakage with external compressed air.
  • the connecting line 14 is connected by means of a 3/2-way solenoid valve 17 with the compressed air supply 20 of the product reservoir 4.
  • the pressure of the compressed air supply 20 is always minimally greater than the product pressure at the pump inlet. This makes it possible to regulate the product level in the compensation reservoir 12, since the product is conveyed back into the product supply line 11 in the direction of the product reservoir 4.
  • the connecting line 14 is thus connected via the solenoid valve 17 to the compressed air supply 20 and compressed air is added until the level in the compensation reservoir 12 has been regulated to a desired value.
  • connection of the connecting line 14 with the compressed air supply 20 is disconnected again.
  • the connecting line 14 is then again connected to a throttle valve 18, which can counteract the occurrence of overpressures and / or allows manual venting of the product chamber and the manual level control of the level in the
  • the monitoring of the level of the product 5 in the compensation reservoir 12 by means of the sensor 16 can also be used to monitor the tightness or wear on the third shaft seal 8.
  • the time between two necessary level adjustments can be used to estimate the sealing effect of the third shaft seal 8.
  • Seal chamber 10 form, which may be arranged around the sealing line on the shaft 2 around. On this mirror liquid level now acts the compressed air. Because the compressed air in the second
  • Sealing chamber 10 and the product pressure in the product chamber 3 have the same value, the differential pressure at the first shaft seal 6 and the second shaft seal 7 is almost zero and prevents further leakage.
  • the shaft 2 should be as perpendicular to the mirror as possible on the barrier liquid and should only deviate a maximum of 20 ° from the vertical. This can ensure that the sealing line on the shaft 2 is always completely covered with barrier fluid.
  • the barrier liquid preferably has a viscosity in the range from 1 mPas to 15,000 mPas, very particularly preferably in the range from 6 mPas to 5,000 mPas. If a cyanoacrylate is kept in the product chamber 3, a solvent for cyanoacrylates is used as the barrier liquid, for example that sold under the name Sicomet D-Bonder
  • FIG. 2 schematically shows a side view of the pump 1 according to FIG. 1.
  • FIG. 3 shows a sectional view of the pump 1, this representation having the same orientation as the side view of the pump 1 according to FIG. 2.
  • the compensation reservoir 12 is connected by means of a connecting tube 22 with the second sealing chamber 10.
  • Connecting hose 22 in Figure 2 is connected via a corresponding bore with the Compensation reservoir 12 in conjunction, while the other port is connected via a corresponding bore with the second sealing chamber 10 in connection.
  • the sealing chambers 9, 10 not visible in FIG. 2 are arranged in the seal housing 24.
  • the product chamber 3 is disposed below the seal housing 24 and communicates with the pump inlet 21 in connection.
  • the first sealing chamber 9 communicates with flushing connections 23 for the sealing liquid, of which only one is visible in the side view shown in FIG.
  • the second sealing chamber 10 is, as explained, via the connecting tube 22 with the compensation reservoir 12 in connection.
  • the connecting tube 22 is arranged such that a product flow is prevented by gravity from the compensation reservoir 12 to the second sealing chamber 10. In the embodiment shown in the figures, this is achieved in that the sealing chambers 9, 10 are arranged elevated relative to the product chamber 3 and also the connecting tube 22 is at least partially raised relative to the compensation reservoir 12.
  • FIG. 4 and 5 respectively show a side and a sectional view of the pump 1 in a different orientation, which is rotated by 90 ° with respect to that shown in Figures 2 and 3.
  • both rinsing connections 23 for the blocking chamber are visible, for example in FIG.
  • FIG. 4 shows the solenoid valve 17 and the sensor 16 for level monitoring in the compensation reservoir 12.
  • FIG. 5 shows that in the embodiment shown opposite each other
  • Flushing connections 23 are in communication with the first sealing chamber 9, which is arranged between the shaft sealing rings 6, 7. Furthermore, the inner end of the pump inlet 21 is visible in FIG. 5, which opens into the product chamber 3.
  • Compensation reservoir 12 automatically venting the pump when filled with product, since the air is pushed out of the product chamber 3 in the compensation reservoir 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe (1) comprenant une chambre de produit (3), destinée à un produit à pomper, et comprenant en outre au moins deux chambres d'étanchéité (9, 10), - une première chambre d'étanchéité (9) étant conçue comme une chambre d'arrêt remplie d'un liquide d'arrêt et rendue étanche par rapport à la chambre de produit (3) par une première garniture d'étanchéité (6) et - une deuxième chambre d'étanchéité (10) étant conçue comme une chambre de pression remplie d'un milieu sous pression et rendue étanche par rapport à la première chambre d'étanchéité (9) par une deuxième garniture d'étanchéité (7), des moyens de compensation de pression étant prévus entre la chambre de produit (3) et la chambre de pression de sorte qu'une différence de pression entre la chambre de produit (3) et la chambre de pression soit sensiblement égale à zéro.
PCT/EP2019/059730 2018-04-18 2019-04-16 Pompe avec chambre de produit WO2019201884A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018205932.2 2018-04-18
DE102018205932.2A DE102018205932A1 (de) 2018-04-18 2018-04-18 Pumpe mit einer Produktkammer

Publications (1)

Publication Number Publication Date
WO2019201884A1 true WO2019201884A1 (fr) 2019-10-24

Family

ID=66240122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/059730 WO2019201884A1 (fr) 2018-04-18 2019-04-16 Pompe avec chambre de produit

Country Status (2)

Country Link
DE (1) DE102018205932A1 (fr)
WO (1) WO2019201884A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027050A1 (fr) * 1993-05-14 1994-11-24 Svenska Rotor Maskiner Ab Compresseur rotatif a vis et a moyens d'etancheite
US6857860B1 (en) * 2000-05-08 2005-02-22 Pomtava Sa Metering pump for liquid products
GB2440542A (en) * 2006-07-31 2008-02-06 Boc Group Plc Vacuum pump gearbox purge gas arrangement
EP2314874A1 (fr) * 2008-07-29 2011-04-27 Kabushiki Kaisha Kobe Seiko Sho Compresseur à vis non lubrifié

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027050A1 (fr) * 1993-05-14 1994-11-24 Svenska Rotor Maskiner Ab Compresseur rotatif a vis et a moyens d'etancheite
US6857860B1 (en) * 2000-05-08 2005-02-22 Pomtava Sa Metering pump for liquid products
GB2440542A (en) * 2006-07-31 2008-02-06 Boc Group Plc Vacuum pump gearbox purge gas arrangement
EP2314874A1 (fr) * 2008-07-29 2011-04-27 Kabushiki Kaisha Kobe Seiko Sho Compresseur à vis non lubrifié

Also Published As

Publication number Publication date
DE102018205932A1 (de) 2019-10-24

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