JP5069352B2 - Side channel pump for pumping fuel in automobiles - Google Patents

Description

  The present invention relates to a side-pump or side-channel pump (Seitenkanalpumpe) for pumping fuel in an automobile, an impeller or impeller rotatably disposed between two housing parts, and both housing parts. An inflow portion arranged in one of the housing parts, an outflow portion arranged in the other housing portion, and guided from the inflow portion to the outflow portion, concentrically surrounding each other, that is, inside and outside each other Two concentric circumferentially extending pumping chambers are provided, each of the pumping chambers being disposed on both end faces of the impeller, each comprising a plurality of guide vanes defining a plurality of vane chamber profiles. Body, i.e. of the type having an annular guide vane row and partially annular passages arranged in both housing parts .

  A side channel pump of this type is known, for example, from DE 103327573. In this side channel pump, the impeller has two toroids consisting of guide vanes that define the contours of the plurality of vane chambers, ie, two annular guide vane rows. The vane chamber of the radially inner annular guide vane row is separated from the radially outer vane chamber via an intermediate ring. This intermediate ring is guided to both housing parts, thereby forming a gap seal between the pumping chambers concentrically surrounding each other. Both annular guide vane rows further have a different number of guide vanes. Therefore, the seal of the pumping chamber causes the circulating flow formed in one pumping chamber to overflow into the other pumping chamber and cause vortex formation at one guide vane in the other pumping chamber. It is necessary to prevent this. Both pumping chambers that are concentrically surrounding each other are connected in parallel to allow the formation of a particularly high volume flow.

  However, a disadvantage of the known side channel pump is that the side channel pump has very large dimensions. Furthermore, contamination or wear in one pumping chamber can generate a higher pressure in this pumping chamber than in the other pumping chamber. This leads to the low efficiency of the side channel pump.

  The problem underlying the present invention is to improve a side channel pump of the type mentioned at the outset, to provide a side channel pump having a particularly high efficiency and a particularly small dimension in the radial direction.

  This object is achieved according to the invention in that the impeller and the housing parts are arranged spaced apart from each other between a pressure-feeding chamber concentrically surrounding each other, i.e. a pressure-feeding chamber extending concentrically and annularly in the circumferential direction. Is solved.

  With such a configuration, separation of the two pumping chambers extending concentrically and annularly in the circumferential direction is avoided. Pumped fuel overflow from a pumping chamber having a higher pressure to a pumping chamber having a lower pressure by pumping an impeller away from both housing parts. Is possible. The pressure compensation produced thereby results in a particularly high efficiency of the side channel pump according to the invention. The reduction in efficiency due to wear or contamination of the pumping chamber is kept particularly small according to the invention. Furthermore, according to the present invention, a dense partition between the two pumping chambers is avoided, so that the pumping chambers can be arranged in close proximity, particularly side by side. This leads to a particularly compact structure of the side channel pump according to the invention, while at the same time providing a particularly small radial dimension.

  If the vane chamber is divided into two partial chambers, arranged side by side in the radial direction, each by a current divider, it contributes to further increase the efficiency of the side channel pump according to the invention. This shunt allows flow guidance in the individual pumping chambers. With such a configuration, the radially inner pumping chamber and the radially outer pumping chamber have the same number of guide vanes, and these guide vanes are further arranged in alignment with each other. Thereby, vortex formation at the time of overflow of the pumped fuel can be kept particularly small.

  In a further advantageous refinement of the invention, the partial chambers arranged side by side in the radial direction are connected to each other at the end face of the impeller. In such a configuration, overflow of the pumped fuel is performed with less vortex generation.

  In a further advantageous refinement of the invention, the shunt is spaced from the end face of the impeller. In such a configuration, it is possible to keep particularly little structural effort for connecting the partial chambers.

  The partial annular passage has another shunt located opposite to the shunt provided in the impeller, the other shunt being on the side of the housing part facing the impeller. If it is spaced from the surface, it contributes to further improving the efficiency of the side channel pump according to the invention.

  The assembly of the side channel pump according to the invention is particularly simple if the shunt is made in one piece with the impeller and / or the housing part.

  The present invention allows a number of embodiments. In order to further clarify the basic principle of the present invention, one of these embodiments is described in detail below with reference to the drawings.

FIG. 2 is a partial cross-sectional view of a fuel pump provided with a pump stage according to the present invention formed as a side channel pump. FIG. 2 is an enlarged view showing a partial range of the side channel pump shown in FIG. 1 with two pumping chambers extending concentrically and annularly in the circumferential direction. FIG. 3 is an enlarged view showing a partial range of the side channel pump, taken along a line III-III in FIG. 2.

  FIG. 1 shows a fuel pump having a side-pump or side-channel pump 2 driven by an electric motor 1. The side channel pump 2 has an impeller or impeller 4 that is mounted on the shaft 3 of the electric motor 1 so as not to be relatively rotatable. The impeller 4 is arranged between the two housing parts 5, 6. Both housing parts 5 and 6 are held at a predetermined distance by a spacer ring 7. Both housing parts 5 and 6 are preloaded (preloaded) against the spacer ring 7 by the peripheral wall 8 of the fuel pump. The side channel pump 2 has a radially inner pressure feeding chamber 9 and a radially outer pressure feeding chamber 10. The two pressure feeding chambers 9 and 10 are located back to back from each other, and an annular guide vane row comprising an annular guide vane 13 and 14 defining the contours of the plurality of partial chambers 11 and 12, and both housing parts 5 and 6. And partly annular passages 15 and 16 arranged in each other. The partial annular passages 15, 16 extend from an inflow portion 17 disposed in one of the housing portions 5, 6 to an outflow portion 18 disposed in the other housing portion 6. . The partial chambers 11 and 12 of the pressure feeding chambers 9 and 10 positioned back to back are further connected to each other inside the impeller 4.

  When the impeller 4 is rotated, the fuel is sucked by the inflow portion 17 and is distributed to both the pressure feeding chambers 10 and 11. At this time, the fuel flows through the impeller 4 in the axial direction and is pumped to the outflow portion 18. Subsequently, the fuel passes through the electric motor 1 and reaches the connecting pipe piece 19 of the fuel pump. A supply pipe line (not shown) can be connected to the connection pipe piece 19.

  In FIG. 2, a partial range on the radially outer side of the side channel pump 2 shown in FIG. 1 is shown enlarged at the outflow portion 18. As can be seen from FIG. 2, the partial chambers 11 and 12 that are positioned back to back are overlapped with each other to form a connection between the partial chambers 11 and 12 that are positioned back to back. Furthermore, the pumping chambers 9, 10 are connected to each other in a separation plane between the impeller 4 and the housing parts 5, 6. A plurality of flow dividers 20 and 21 are arranged in the impeller 4 and the partial annular passages 15 and 16. These flow dividers 20, 21 guide the flow of pumped fuel in each pumping chamber 9, 10. However, since the shunts 20, 21 are spaced from the separation plane between the impeller 4 and the housing parts 5, 6, from one pumping chamber 9; 10 to the other pumping chamber 10; Overflow is possible. Furthermore, the side channel pump 2 has a particularly small radial dimension, since the pumping chambers 9, 10 are thereby arranged particularly close to each other.

  FIG. 3 is an enlarged view showing a partial range of the outer side in the radial direction of the impeller 4 along a line III-III in FIG. 2. As can be seen from FIG. 3, the two pumping chambers 9, 10 have the same number of partial chambers 11, 12. As a result, the flow divider 20 arranged in the impeller 4 allows the vane chambers 22 formed by the guide vanes 13 and 14 to be separated into the individual partial chambers 11 and 12 of the pressure feeding chambers 9 and 10 that radially surround each other. It is divided. This ensures that the overflow fuel is supplied from one pumping chamber 9; 10 into the other pumping chamber 10; 9 at a predetermined position before each guide vane 13, 14.

Claims (4)

A side channel pump for pumping fuel in an automobile, wherein the impeller is rotatably arranged between two housing parts, an inflow part arranged in one of the two housing parts, and the other And two pumping chambers concentrically surrounding each other, which are guided from the inflow part to the outflow part, are provided at both ends of the impeller. An impeller of the type having an annular guide vane row comprising a plurality of guide vanes disposed on a surface and defining a plurality of vane chamber profiles, and a partial annular passage disposed in both housing portions. (4) and the two housing parts (5, 6) are mutually connected between the two pumping chambers (9, 10) concentrically surrounding each other. Are arranged with a septum, vane chamber (22), each shunt by (20), is divided into side by side in the radial direction arranged two parts chambers (11, 12), said shunt The container (20) is spaced from the end face of the impeller (4), and the partial chambers (11, 12) arranged side by side in the radial direction are connected to each other at the end face of the impeller (4). wherein the is, the side channel pump for pumping fuel in a motor vehicle. The partial annular passage (15, 16) has another flow divider (21) located opposite the flow divider (20) provided in the impeller (4), and the other flow divider ( 21) of the two housing parts (5,6), an impeller (4) situated opposite the are spaced from the surface on the side, according to claim 1, wherein the side channel pump. 3. The side channel pump according to claim 2, wherein the further flow divider (21) is made in one piece with the housing part (5, 6). The side channel pump according to any one of claims 1 to 3 , wherein the flow divider ( 20 ) is manufactured integrally with the impeller (4 ) .

Images