Double feed pump, in particular for windshield washer systems in

Rotary kinetic fluid motors or pumps – Selectively adjustable vane or working fluid control means – Upstream of runner

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Details

415911, 417442, F01D 130

Patent

active

051866064

DESCRIPTION:

BRIEF SUMMARY
INTRODUCTION

The present invention relates to a double feed pump which can be used as a pump for windshield washer systems in motor vehicles.


BACKGROUND OF THE INVENTION

From the German laid open print 35 32 580 (FIGS. 6 and 7), a pump of this kind is known which, in dependence on the direction of rotation, delivers washing liquid either to washing places on the windshield or to washing places on the headlamp lenses of a motor vehicle. Such a pump includes two housing parts. Two outlet channels, two valves seats, two delivery chambers of sealing membranes and two pressure channels are positioned in one of the housing parts, which consequently has a complicated construction and can only be manufactured with difficulty.
The invention is therefore based on the problem of developing a double feed pump which has a simple construction and can be manufactured easily.


BRIEF DESCRIPTION OF THE INVENTION

The foregoing problem is solved according to the invention through provision of a double feed pump, in which the sealing membranes are arranged in a parting plane of a two-part housing and each housing part accommodates an outlet channel and a front compartment with valve seat assigned to one sealing membrane, a rear compartment assigned to the other sealing membrane and a pressure channel between the front and the rear compartments. Thus, the water carrying compartments and channels of a double feed pump according to the invention are uniformly distributed on both portions of a two-part housing in the parting plane where the sealing membranes are arranged. For this reason, the two housing portions can have a relatively simple shape, and can be manufactured easily.
So-called rotary pumps are typically used as feed pumps for washing liquid in motor vehicles, in which pumps an impeller is driven by an electric motor, wherein the impeller takes in the liquid through a central connection piece and, as far as a double feed pump is concerned, presses it into two delivery channels branched off from the delivery chamber. In dependence on the direction of rotation of the impeller, the pressure in one delivery channel is higher than in the other delivery channel or vice versa. According to one configuration, at least one of the two delivery channels opens into the front compartment assigned to a sealing membrane. According to another configuration, at least one of the two delivery channels can also open into the rear compartment assigned to a sealing membrane. Thereby, an embodiment is preferred in which according to claim 5 one delivery channel is positioned in one housing half and the other delivery channel in the other housing half.
The construction is especially simple and involves little sealing problems, if an outlet channel serves as a pressure channel. The outlet channel, branched off from the front compartment of one sealing membrane, extends preferably in a direction towards the second sealing membrane and is open there towards the rear compartment of the second sealing membrane.
The shape of a housing half is also simple, if a pressure channel is formed as a duct which is open towards the parting plane of the housing half. If both pressure channels are developed as ducts open towards the parting plane, they can be laterally set off for being sealed reciprocally.
A pressure channel can also be branched off from a delivery channel.
Handling and mounting of the two sealing membranes is simplified in that the latter are integrally connected with each other through a transition piece. If the two pressure channels intersect entirely or partially, the transition piece interconnecting the two sealing membranes can simultaneously be used for separating the two pressure channels from each other.
The sealing membranes, the compartments, the delivery channels and the outlet channels can be arranged axially symmetrically in pairs. Consequently in one direction of rotation of the pump the pressure conditions on one membrane are the same as in the other direction of rotation of the pump on the other membrane. Modification

REFERENCES:
patent: 3851993 (1974-12-01), Foster
patent: 4728260 (1988-03-01), Ishii
patent: 4874298 (1989-10-01), Mainardi et al.
patent: 4900235 (1990-02-01), Perkins et al.

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