DE20200121U1 - Dosing pump for pasty masses - Google Patents

Description

TERMEER STEINMEISTER & PARTNER GBR PATENTANWÄLTE - EUROPEAN PATENT ATTORNEYS

Dr. Nicolaus 1er Meer, Dipl.-Chem. Peter Urner, Dipl.-Phys. Gebhard Merkle, Dipl.-Ing. (FH) Mauerkircherstrasse 45 D-81679 MUNICH

Helmut Steinmeister, Dipl.-Ing. Manfred Wiebusch

Artur-Ladebeck-Strasse 51 D-33617 BIELEFELD

INTPOl /Ol / G

St/zs/ec

4.1.2002

I.N.T. GmbH

Engineering office for new technologies,

Plant engineering, process engineering, ADFOSY

Heideblümchenweg 50

33689 Bielefeld

DOSING PUMP FOR PASTY MASSES

I.N.T. GmbH

»WFP61/01/E

4.1.2002

DOSING PUMP FOR PASTY MASSES

The invention relates to a dosing pump for pasty masses, with a pump chamber which can be cyclically enlarged and reduced by a displacement body, as well as one-way valves in the area of the inlet and outlet of the pump chamber, which only allow a mass flow in the predetermined conveying direction.

Pasty masses such as adhesives, sealants, paints and varnishes, lubricants and the like are often dispensed using dosing devices whose operating principle is based on the fact that the interior of a dosing cylinder is cyclically enlarged and reduced by a piston running in the cylinder. While the piston enlarges the interior of the cylinder, the pasty mass is pumped from a container into the displacement chamber by means of a pump, while the pasty mass is pressed out when the cylinder chamber is reduced. Dosing devices of this type are widespread and are at a relatively high level of development, but still have the disadvantage that they require a relatively large amount of space. This applies in particular to the dimension in the direction of the piston movement, since the dimensions in this direction are inevitably relatively large.

The invention is therefore based on the object of creating a dosing pump of the type mentioned, which enables a relatively compact design.

This object is achieved according to the invention in a metering pump of the above type in that the pump chamber is designed as an annular chamber around a displacement shaft, that the annular chamber is interrupted in an angular position of its circumference by a radial web between the inner chamber wall and the displacement shaft and that the displacement body is designed as a vane projecting radially from the displacement shaft and covering the cross section of the annular pump chamber.

The inlet and outlet of the pump chamber can enter the pump chamber axially, i.e. parallel to the displacement shaft.

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In the following, preferred embodiments of the invention are explained in more detail with reference to the accompanying drawings.

Fig. 1 is a schematic vertical section through an inventive

dosing pump in accordance with the requirements;

Fig. 2 shows the pump chamber in a cross section perpendicular to the

displacement shaft;

In Fig. 1, an electric motor 10 with associated gear 12 is shown in the upper area. An angle measuring system 14 is attached to the housing of the electric motor 10, into which supply lines 16 and control lines 18 enter. On the underside of the gear 12 there is a coupling housing 20, only indicated schematically, in which a coupling 22 establishes a connection between an output shaft 24 of the gear 12 and a displacement shaft 26 of the metering pump to be described below.

The metering pump, designated overall by 28, has a pump housing 30 which, for manufacturing reasons, is formed by three disc-shaped sub-housings 32, 34, 36 placed one on top of the other.

The displacement shaft 26 extends through all three partial housings 32, 34, 36 and passes through a pump chamber 38 on the upper side of the lower partial housing 36, the horizontal cross-sectional shape of which can be seen in Fig. 2. The pump chamber 38 surrounds the displacement shaft 26 in a ring with a substantially rectangular cross-section, as shown in Fig. 1. This ring is interrupted in a radial position by a radial web 40.

The displacement shaft 26 has a radial vane 42 which covers the entire cross-sectional area of the ring and which in the present context has the function of a piston or displacement body. Immediately adjacent to the fixed web 40, the material outlet in the annular pump chamber is in the form of a small channel 44 which initially runs parallel to the axis of the displacement shaft 26 in the lower housing part 36 and then exits radially outwards.

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The material inlet is formed by a channel 46 which initially runs radially from the outside to the inside and then parallel to the axis and by a channel 48 which extends this to the pump chamber 38.

It can be seen that the partial space of the annular pump chamber delimited by the web 40 and the vane 42 is enlarged or reduced in relation to the material inlet and material outlet when the displacement shaft 26 rotates. In the channels 46, 48 and 44 or immediately outside the pump housing in the corresponding connecting lines there are one-way valves, for example check valves, which ensure exclusive material movement from the material inlet to the material outlet.

Since the metering pump according to the invention works with a rotational movement, it allows a significantly shorter design than the usual metering pumps that pump by axial movement of a piston.

Controls that allow an electric motor to rotate through an angle of almost 360° at predetermined times and at predetermined speeds are readily available on the market. The respective angular position of the displacement shaft 26 can be calibrated using a microswitch 50.

Furthermore, it can be seen in Fig. 1 that radial vent holes are provided in the second and third partial housings 34, 36, which have no significance in the present context and therefore do not bear any reference numbers.
25

Claims (1)

Dosing pump for pasty masses, with a pump chamber ( 38 ) which can be cyclically enlarged and reduced by a displacement body ( 42 ), and one-way valves in the area of the inlet and outlet of the pump chamber ( 38 ) which only permit a mass flow in the predetermined conveying direction, characterized in that the pump chamber ( 38 ) is designed as an annular chamber around a displacement shaft ( 26 ), that the annular chamber is interrupted in an angular position of its circumference by a radial web ( 40 ) between the inner chamber wall and the displacement shaft ( 26 ), and that the displacement body is designed as a vane ( 42 ) which projects radially from the displacement shaft ( 26 ) and covers the cross section of the pump chamber ( 38 ).