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Metering device for introducing a liquid additive into a stream of main liquid

A technology for liquid additives and metering devices, applied in pump devices, liquid variable volume machinery, transportation and packaging, etc., can solve problems such as reduced accuracy and achieve the effect of improving efficiency

Active Publication Date: 2015-11-04
DOSATRON INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to a loss of accuracy or the impossibility of obtaining the pressure drop required for the operation of the metering pump over a large flow range (especially with a ratio of 6 to 10 between the minimum and maximum values ​​of the main flow)

Method used

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  • Metering device for introducing a liquid additive into a stream of main liquid
  • Metering device for introducing a liquid additive into a stream of main liquid
  • Metering device for introducing a liquid additive into a stream of main liquid

Examples

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Embodiment Construction

[0037] said drawings, especially Figures 1 to 3 , shows a metering device D for introducing a liquid additive A into a main liquid stream L flowing in a schematically shown pipe 1 . The primary liquid is usually water, but Apparatus D can be adapted for any type of liquid. Liquid additive A is contained in a schematically shown container 2 .

[0038] The device D comprises a pump 3 whose axis is arranged vertically. The pump 3 is of a known type, in particular manufactured and sold by the applicant. Examples of such pumps are described in EP 1151196 or US 6684753 . Such as figure 2 Schematically shown in , the pump 3 comprises a reciprocating differential piston 4 driving a piston 5 of smaller diameter in order to draw and meter the additive in the container 2 . The plunger 5 slides in a cylindrical chamber of an auxiliary pump 6 connected to the container 2 via a delivery tube 7 . The tube 7 is immersed in the additive A to be extracted.

[0039] A conventional valve...

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PUM

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Abstract

Metering device for introducing a liquid additive into a stream of main liquid flowing along a pipe, comprising a pump (3) having a reciprocating differential piston for withdrawing the additive (A) from a container (2) and metering it, this pump comprising a first inlet (8) to receive a flow of main liquid which drives the pump, a second inlet (9) for picking up the additive and an outlet (10) for the mixture of additive and main liquid, the device comprising a Venturi (11) installed in the pipe, the pump (3) being connected in parallel with the Venturi (11), the first inlet (8) of the pump being connected by a first line (12) to the inlet of the Venturi while the outlet (10) of the pump is connected by a second line (13) to the throat (11c) of the Venturi; the device comprises a means (E) for varying the restriction at the neck (11c) of the Venturi, and a means (G) sensitive to the pressure drop across the pump (3) for controlling the means (E) of restricting the neck of the Venturi in order to reduce the bore section when the pressure drop across the pump increases, and to increase the bore section when the pressure drop across the pump decreases.

Description

technical field [0001] The invention relates to a metering device for introducing a liquid additive into a main liquid stream flowing in a pipeline, said device being of the type comprising a reciprocating differential piston pump, said reciprocating differential piston pump For drawing and metering additives in a container, the pump comprises a first inlet for receiving the main flow of liquid driving the pump, a second inlet for drawing the additives and an outlet for mixing the additives with the liquid, the Said device comprises a Venturi tube arranged in a pipeline, a pump is connected in parallel with said Venturi tube, a first inlet of the pump is connected to the inlet of said Venturi tube through a first pipeline, and an outlet of the pump is connected through a second pipeline to the throat of the venturi. Background technique [0002] Such a metering device is known from EP 1773479 by the applicant, by means of which a compact pump can be used to handle high main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B9/105F04B13/02F04B23/10F04F5/10F04F5/46B01F5/04
CPCF04B9/1053B01F5/0428B01F5/0496F04B13/02F04B23/106F04F5/10F04F5/461F04F5/463B01F25/31242B01F25/316F04F5/12F04F5/48B01F25/31232B01F25/312511B01F25/3143
Inventor S·菲雷S·朗比内P·迪凯努瓦M·巴迪
Owner DOSATRON INT