DE1943395A1 - Rotary vane piston pump - Google Patents

Description

DR. 'BC ^ «Γ •! PL.-NG. STAPF

O MÜN'OHEM 2, H1LBLESTRA33E 2O

CIBA AKTIENGESELLSCHAFT, BASEL (SWITZERLAND)

Attorney's file 18 727 Munich, August 26, 1969

Case 655O / E

Rotary vane - piston - pump

Chemical process engineering in recent years has been characterized by continuous, largely automated manufacturing processes. The resulting necessity to safely control pump flows of the most varied of dimensions and properties is very important
Requirements for the used funding and
Dosing devices. The dosing achieved the greatest importance

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pump. In terms of the system, the so-called rotary vane piston pumps. * "-.

The previously known rotary valve pistons-- ■ Pumps are fitted with an exactly fitted into the pump chamber Equipped with rotary valve piston. To obtain a sufficient, The sealing effect between the inlet and outlet side are very tight tolerances between the pump housing and Piston required. The very tight tolerances lead in particular. in the event of temperature fluctuations, there is a sharp drop in efficiency and metering accuracy. By the processing, tolerance and strength requirements disadvantageously also the choice of construction materials is limited. The well-known pumps are also for suspensions or highly corrosive media. poorly suited, as there are disruptions in promoting such media and thus also inaccuracies in the dosage occur.

The invention relates to a rotary vane piston pump, whose piston has at least one channel for the alternative connection of the pump chamber with the inlet or the outlet having, the stroke-rotation kinematics of the piston so is designed that the inlet or outlet-side mouth of said channel during the suction stroke over the Inlet opening and during, the pressure stroke is above the outlet opening. Here, the disadvantages outlined above are overcome according to the invention in that the input and

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the outlet are each formed by a pipe socket, which vei'Hchieblleh. and spring-loaded into the Purnpenkarnraer and »lit their ends tightly on the circumference of the piston are pressed.

In the pump according to the invention, as a result of the resilient pipe socket on a tight, guide of the 'piston are distorted in the pump housing. As a result, the sealing and tolerance problems easily manageable. Temperature fluctuations or the associated dimensional changes of the housing, piston and pipe socket are compensated by the pipe socket suspension. The pump can easily be from the for the respective purpose: the most suitable materials getting produced. With the choice of suitable construction materials, it can also be corrosion-resistant without further ado · For universal use is preferred Glass and the branded product Teflon are used.

In the following, the subject of the invention is based on an embodiment shown in the drawing explained in more detail; show it:

Fig. 1 shows the embodiment in section the cylinder and pipe socket axes,

FIGS. 2 to 6 are schematic axial sectional representations the pump in different phases of action to explain the functional catfish and

Fig. 7 is a section along VII Einle - VH of ¹

Flg. Mr.

According to "Fig. 1, the pump consists essentially of: a double-walled pump housing 1 with two heating or coolant connections 10 and 11; a pump cylinder 2; a displacement piston 3 formed by a tube that is open on the pump chamber side and closed to the outside by an insert 12, its functionally more important part ays a position and well-defined in size perforation 4 is made, and a suction nozzle 5 ■■■ and a k diametrically opposite the discharge nozzle 6, which exactly adapted to the outer surface of the displacement of the piston 3, on particular supplied sanded and sealed by means of springs 7 and 8 The other components, in particular sealing, connecting and connecting parts, are of a type common in pump construction and are therefore not described in detail *

The housing 1, the cylinder and the piston 3 preferably consist of apparatus glass and the two nozzles 5 and 6 from the branded product Teflon.

In the simplified illustrations of the Pig. 2 to 7 are again denotes: the pump housing with 1, the piston with 3, its perforation with 4, the suction nozzle with 5 and the pressure nozzle with 6. The hollow displacement piston 3 is through a corresponding drive (not shown) into a Rotary movement symbolized by the arrow r and a through the arrow h symbolized back and forth movement. the

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BAD ORIölMAi,

Perforation zone h is arranged so that it is located on the suction nozzle 5 at the beginning of the suction stroke, while at the same time the non-perforated part of the piston on the pressure side rests tightly on the pressure nozzle 6 and closes it (FIG. 2). By means of a lifting movement in the direction of the arrow -fh in FIG. 2, liquid or suspension is now sucked in in the direction of the arrow S. This enters the pump via the suction nozzle 5 through the piston perforation 4. At the same time or at the end of the stroke movement + h, the piston 3 is set into its rotating movement r (Fig * 3) - As a result, the perforating zone 4 moves from the suction side via a dead zone to the pressure side. During the opposite stroke movement -h that now follows, the liquid or suspension located in the pump housing is conveyed further in the direction of arrow D via perforation 4 and pressure port 6 (FIG. K). The suction nozzle 5 is closed off during this work step by the non-perforated piston part, as is the pressure nozzle during the suction stroke (Fig. 2, 3). At the end of or during the displacement stroke, the piston 3 is again set into a rotating movement r so that its perforated zone Λ moves from the pressure port 6 via a dead zone to the suction port 5 (FIG. 5). As soon as the perforated zone reaches the suction nozzle> the cycle starts again (Fig. 6).

The drive is preferably one with continuous adjustable stroke and rotary movement used. There-

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by making it possible, e.g. very quick but short or perform slow and long strokes in all variations.

In the pump shown, the piston moves freely in the pump housing. The seal between the inlet and outlet side is brought about by freely moving parts that are resilient and tightly seated on the outer surface of the coil, namely by the suction mouth, the pressure nozzle. The dosing accuracy is therefore neither influenced by tolerance problems nor by the influence of temperature fluctuations on the construction material. This makes it possible to use practically all construction materials, such as metals, glass, plastics, ceramics, etc. for the construction of such pumps. Thanks to this advantage and in combination with the valveless construction, practically all liquids or suspensions can be conveyed with such pumps ^; will.

Another salient advantage of pumps of the structure according to the invention is their astonishingly high metering range and their constant, very high metering accuracy over the entire available metering range. With a test model made of glass and Teflon, dosing accuracies of 0.2-2 $ 0 could be achieved in a delivery range of 0.04-5.3 liters per hour. With regard to the conveying range as well as the dosing accuracy, these are values which are far above those which the constructions used up to now have.

0098 1071324

Another advantage of pumps with the features of the invention lies in their high reliability in continuous operation; their susceptibility to failure is minimal and the on high dosing accuracy is guaranteed even in continuous operation.

BATH

0 098T0 / 1324

Claims (3)

■ - * ■ - entitlements 1. J rotary vane piston pump, the piston of which has at least one channel for the alternative connection of the pump chamber with the inlet or the outlet, the lifting-rotary kinematics of the piston is designed so that the inlet or outlet-side mouth of said channel during the Suction stroke above the inlet opening and during the pressure stroke above the outlet opening, characterized in that that the inlet and the outlet each go through a pipe socket (5 or 6) are formed, which are displaceable and spring-loaded are introduced into the pump chamber (1) and pressed with their ends tightly onto the circumference of the piston (3). 2. Pump according to claim 1, characterized in that that the piston (3) in relation to the inner surface of the pump chamber wall is non-contact. 3 · Pump according to claim 1 or 2, characterized in that that the piston passes through a tube that is open on the pump chamber side Is formed, .which to form the channels connecting the pump chambers alternately with the inlet or the outlet is perforated in a certain zone (4). · 9810/1324 Empty side