Suction jet pump

Abstract

A suction jet pump has a fuel line, a propulsion jet nozzle, an intake region, a mixing tube, and a diffuser. The propulsion jet nozzle and the mixing tube are oriented rectilinearly with respect to one another. As viewed in the direction of flow, the diffuser has a course which differs from the course of the mixing tube.

Claims

1. A suction jet pump comprising: a propellant line; a propulsion jet nozzle fluidically downstream of the propellant line; a suction region; a mixing pipe arranged fluidically downstream of the suction region and orientated in a linear manner with respect to the propulsion jet nozzle; a diffuser having an uninterrupted concave surface facing an outlet of the mixing pipe and arranged to surround the mixing pipe in a coaxial manner, wherein the diffuser, when viewed in a flow direction, has a path that deviates from a path of the mixing pipe; and a plurality of individual webs configured to support the diffuser that extend from an outer periphery of the diffuser into a region of the propulsion jet nozzle.

2. The suction jet pump as claimed in claim 1, wherein the diffuser has a curved path.

3. The suction jet pump as claimed in claim 1, wherein the diffuser is substantially funnel shaped and an output of the diffuser is arranged along an axis of the diffuser.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in greater detail with reference to a plurality of embodiments, in which:

(2) FIG. 1 is a suction jet pump according to the invention;

(3) FIGS. 2, 3 are suction jet pumps having a redirection element; and

(4) FIG. 4 shows a suction jet pump having a coaxial diffuser.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(5) FIG. 1 shows a suction jet pump and a filter 1 in a fuel container of a motor vehicle. The suction jet pump comprises a propellant line 2, via which fuel is supplied from a fuel pump, which is not illustrated, as a propellant of the suction jet pump. The propellant line 2 is adjoined by a propellant nozzle 3. The fuel discharged from the propellant nozzle 3 is introduced via the collection funnel 4 into the mixing pipe 5. As a result of the high speed of the fuel which is discharged, there is produced in a suction region 6 a reduced pressure by which fuel is drawn via a suction opening 7 from the fuel container into the mixing pipe 5. After the mixing pipe 5 has been passed, the conveyed fuel reaches the diffuser 8. The diffuser 8 is constructed to be curved and consequently has a path which deviates from the linear path of the mixing pipe 5. As a result of the curvature of the diffuser 8, the suction jet pump, in spite of the arrangement of the filter 1, can be positioned at the illustrated position in the fuel container.

(6) FIG. 2 shows a suction jet pump having a redirection element 9, arranged between the mixing pipe 5 and the diffuser 8. The redirection element 9 redirects the conveyed fuel through 180 so that the diffuser 8 has a path, which is directed parallel with and counter to the path of the mixing pipe 5. Since the redirection is carried out via the redirection element 9 and this is a separate component, the diffuser 8 may be constructed in a linear manner. The assembly of the mixing pipe 5, redirection element 9 and diffuser 8 is carried out by a plug-type connection or by adhesive bonding or welding.

(7) FIG. 3 shows a suction jet pump having a redirection element 9. In contrast to FIG. 2, the redirection element 9 has a curvature of only 45. It is further connected to the diffuser 8 in an integral manner so that there is only one assembly location with respect to the mixing pipe 5.

(8) The suction jet pump in FIG. 4 has a diffuser 8 arranged coaxially with respect to the mixing pipe 5 and surrounds mixing pipe 5. The conveyed fuel is discharged from the mixing pipe 5 and is redirected by the diffuser through 180 to then flow through the diffuser 8 in an opposing direction and consequently in a path that deviates with respect to the mixing pipe 5. The securing of the diffuser 8 is carried out by individual webs 10 that extend from the outer periphery of the diffuser 8 into the region of the propulsion jet nozzle 3. At the end face of the diffuser 8 facing away from the mixing pipe 5, there is integrally formed an engaging step 11 that engages in a corresponding engaging location 12 of another component 13. Via this connection, the diffuser 8 is also retained and positioned with respect to the mixing pipe 5. However, it is also conceivable for the diffuser 8 to be secured by only one of the two connection types.

(9) Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.