阅读说明：本技术 抽吸喷射泵装置 (Suction jet pump device ) 是由 A·伯克尔 T·谢弗 于 2018-12-20 设计创作，主要内容包括：一种具有抽吸喷射泵(12)的抽吸喷射泵装置(10),其包括用于将燃料驱动流供给至抽吸喷射泵(12)的主流体入口(14),用于将待输送的燃料供给至抽吸喷射泵(12)的次流体入口(16),用于输出燃料的流体出口(18)以及围绕抽吸喷射泵(12)的与流体出口相对的第一端的收集容器(20)。容器优选地从至少三个侧面围绕主流体入口(14),使得抽吸喷射泵(12)通过次流体入口(16)将燃料从收集容器(20)的内部容积(22)中抽出。收集容器(20)具有至少一个燃料入口开口(24),用于将燃料从外部供给至收集容器(20)的内部容积(22)。(A suction jet pump device (10) with a suction jet pump (12) comprises a main fluid inlet (14) for supplying a fuel driving flow to the suction jet pump (12), a secondary fluid inlet (16) for supplying fuel to be delivered to the suction jet pump (12), a fluid outlet (18) for outputting fuel and a collecting container (20) surrounding a first end of the suction jet pump (12) opposite to the fluid outlet. The container preferably surrounds the primary fluid inlet (14) from at least three sides such that the suction jet pump (12) draws fuel from the interior volume (22) of the collection container (20) through the secondary fluid inlet (16). The collecting container (20) has at least one fuel inlet opening (24) for supplying fuel from the outside to the inner volume (22) of the collecting container (20).)

1. A suction jet pump device (10), the suction jet pump device (10) comprising:

a suction jet pump (12), the suction jet pump (12) having a main fluid inlet (14), the main fluid inlet (14) for supplying a fuel drive stream to the suction jet pump (12);

a secondary fluid inlet (16), the secondary fluid inlet (16) for supplying fuel to be delivered to the ejector pump (12);

a fluid outlet (18), the fluid outlet (18) for outputting fuel;

a collection reservoir (20), the collection reservoir (20) surrounding a first end of the suction jet pump (12) opposite the fluid outlet from at least three sides such that the suction jet pump (12) draws fuel from an interior volume (22) of the collection reservoir (22) through the secondary fluid inlet (16); and

the collecting container (20) has at least one fuel inlet opening (24), the fuel inlet opening (24) being used for supplying fuel from the outside to the inner volume (22) of the collecting container (22).

2. The ejector pump device (10) of claim 1, wherein the fuel inlet opening (24) of the collecting reservoir is arranged lower than the secondary fluid inlet (16) of the ejector pump (12).

3. A suction jet pump device (10) according to claim 1, wherein a portion (25) of the collecting container (20) surrounding the main fluid inlet (14) has a U-shaped cross-section when viewed from above.

4. A suction jet pump device (10) according to claim 3, wherein the upper edges of the two side walls (28a, 28b) forming the U-shaped portion (25) of the collecting container (20) have an inclined shape, the highest point of the two side walls of the U-shaped portion (25) being on the rear side wall (26) of the U-shaped portion (25).

5. A suction jet pump device (10) according to claim 3, wherein the collecting container (20) has a second U-shaped portion (30) arranged at an angle of 90 ° with respect to the first U-shaped portion (25), one side wall (34) of the second U-shaped portion (30) being connected with one side wall (28a) of the first U-shaped portion (25).

6. A suction jet pump device (10) according to claim 5, wherein the upper edges of the two side walls (34a, 34b) of the second U-shaped portion (30) of the collecting container (20) have an inclined shape, the highest point of the two side walls (34a, 34b) of the second U-shaped portion (30) being on the rear side wall (32) of the second U-shaped portion (30).

7. A suction jet pump device (10) according to claim 4, wherein the side walls (28a, 28b) of the first U-shaped portion (25) of the collecting container (20) extend beyond the secondary fluid inlet (16) so that fuel in the region of the secondary fluid inlet (16) can be retained by the side walls of the first U-shaped portion.

8. The suction jet pump device (10) according to claim 4, wherein the inclined edge of at least one of the first and second U-shaped portions (25, 30) of the collection container (20) is inclined at an angle of at least 30 ° to 40 ° compared to the underside of the suction jet pump (12).

9. The suction jet pump device (10) according to claim 1, wherein the collection container (20) has a spiral shape when viewed from above.

10. A suction jet pump device (10) according to claim 9, wherein at least one of the outer walls of the spiral-shaped collecting container (20) comprises the at least one fuel inlet opening (24) for supplying fuel from outside to the inner volume (22) of the collecting container (20).

11. The suction jet pump device (10) according to claim 1, wherein the collection container surrounds the main fluid inlet (14) of the suction jet pump (12).

12. A suction jet pump device (10) according to claim 4, wherein the rear side wall (32) of the second U-shaped portion (30) of the collecting container (20) extends beyond the secondary fluid inlet (26) so that fuel in the region of the secondary fluid inlet (16) can be retained by the rear side wall (32).

13. The suction jet pump device (10) according to claim 9, wherein the collection container (20) surrounds the suction jet pump (12) such that the spiral extends at least 450 ° around the suction jet pump (12).

14. A suction jet pump device (10) according to claim 1, wherein the collecting container (20) has a snail shape when viewed from above.

Technical Field

The present disclosure relates to a suction jet pump device.

Background

It is known to use suction jet pumps to deliver fuel inside the fuel tank of a motor vehicle. Fig. 4 shows a typical arrangement known from the prior art, wherein a fuel tank 100 comprises a primary side 102 and a secondary side 104. A fuel pump 106 for delivering fuel to the internal combustion engine is arranged in the main side 102 of the fuel tank 100. At the tank bottom 108 of the secondary side 104, an injection pump 12 is arranged in order to convey fuel from the secondary side 104 to the primary side 102.

To drive the jet pump 12, the main fuel pump 106 delivers fuel at a pressure to the suction jet pump 12 through a supply line. Using venturi principles, the ejector pump 12 draws fuel from the secondary side 104 and delivers the fuel to the primary side 106 using a recirculation line. The jet pump 12 is always running whether fuel is stored in the secondary side 104 or the secondary side 104 is empty.

When the fuel tank reaches a low fuel level, the secondary side 104 is almost empty, because most of the remaining fuel has been delivered to the primary side 102 by the injection pump 12. However, the fuel pump 106 still delivers fuel to the injection pump 12 through the supply line. Since there is no or only little fuel remaining in the secondary side 104, the injection pump 12 can be operated without load, in particular in a tilted position of the vehicle or during acceleration (acceleration, sideslip (breaking) or cornering).

We have found that this can cause losses as fuel from the supply line escapes through the jet pump 12 to the secondary side 104. Thus, the fuel reservoir in which the main pump module 106 is disposed will drain more quickly.

Disclosure of Invention

It is an object of the present disclosure to provide a suction jet pump arrangement with improved reserves for different driving situations and to avoid jet pump losses.

The present disclosure relates to a suction jet pump device having a jet pump, which includes: a main fluid inlet for supplying a fuel driving flow to the suction jet pump; a secondary fluid inlet for supplying fuel to be delivered to the suction jet pump; and a fluid outlet for outputting fuel. The main function of the ejector pump is known from the prior art and is therefore not described in detail.

The suction jet pump device further comprises a collection container surrounding a first end of the suction jet pump, the first end being arranged opposite to the fluid outlet of the suction jet pump. The collecting container in particular surrounds a main fluid inlet, which can be arranged opposite the fluid outlet. The first end or primary fluid inlet of the ejector pump is surrounded on at least three sides such that the ejector pump draws fuel from the inner volume of the collecting container through the secondary fluid inlet.

The collecting container has at least one fuel inlet opening for supplying fuel from the outside to the inner volume of the collecting container.

The collecting container helps to reduce fuel losses, i.e. fuel that may be returned from the supply line by the suction jet pump. This is particularly important in driving situations where acceleration must be overcome to output fluid from the fluid outlet of the suction jet pump. Such an acceleration may occur, for example, when the fluid outlet is arranged geodetically higher than the secondary fluid inlet. Such accelerations can also occur during rapid cornering or acceleration of the vehicle, so that the suction jet pump attempts to deliver fuel to the fluid outlet against the acceleration force. The problem with this is that the pressure difference required to overcome this acceleration and properly deliver the fuel through the fluid outlet cannot be achieved by the pressure supplied to the suction jet pump by a supply line connectable to the main fluid inlet of the suction jet pump.

By retaining a certain amount of fuel in the collection container (which may be, for example, 5 ml to 10 ml of fuel), the pressure differential that must be overcome by the pressure supplied to the ejector pump through the main fluid inlet can be reduced so that the ejector pump can properly deliver fuel through the fluid outlet without any backflow of fuel in the wrong direction by the ejector pump. Fuel losses in specific driving situations can thereby be reduced.

In one form, the fuel inlet opening of the collection vessel is disposed below the secondary fluid inlet of the suction jet pump. Therefore, the level at which the suction jet pump sucks fuel from the bottom of the fuel tank does not increase.

The portion of the collection container surrounding the main fluid inlet or the first end of the suction jet pump opposite the fluid outlet preferably has a U-shaped cross-section when viewed from above.

This is an embodiment of the collecting container of the invention which may be sufficient to reduce fuel losses in the most urgent driving situations, since with such a collecting container, when the secondary fluid inlet is geodetically lowest compared to the fluid outlet, fuel may be retained in the region of the secondary fluid inlet, so that the pressure difference which needs to be overcome by the pressure supplied to the suction jet pump through the primary fluid inlet is greatest. In such most critical driving conditions it is sufficient to use a U-shaped collection container around the primary fluid inlet and the secondary fluid inlet, so that the pressure differential to be overcome is reduced, as described above.

In one form, the upper edges of the two side walls of the U-shaped portion of the collecting container are in an inclined shape, the highest point of the two side walls being at the rear side wall of the U-shaped portion. By this feature, the amount of material required for manufacturing the collecting container, for example in an injection moulding process, can be reduced. The two side walls of the U-shaped portion of the collecting container do not have to extend horizontally, since an acceleration force in the direction opposite to the direction in which the suction jet pump delivers fuel towards the fluid outlet will cause the liquid level to rise in the direction away from the fluid outlet. For example, if the acceleration is 1g, the liquid level will rise at an angle of 45 ° in a direction away from the fluid outlet of the suction jet pump. This feature will be described in more detail in the context of the drawings.

In another form, the collection container includes a second U-shaped section disposed at a 90 ° angle relative to the first U-shaped section, with one side wall of the second U-shaped section being connected to one side wall of the first U-shaped section container. By this feature, acceleration forces in other directions can be compensated for (e.g. in less urgent driving situations, fuel losses may nevertheless occur).

In this form, the upper edges of the two side walls of the second U-shaped portion of the collecting container preferably have an inclined shape, the highest point of the two side walls being located at the rear side wall of the second U-shaped portion.

The side walls of the first U-shaped portion of the collecting vessel preferably extend beyond the secondary fluid inlet so that fuel in the region of the secondary fluid inlet can be retained by these side walls. Alternatively or additionally, the rear side wall of the second U-shaped portion of the collection container may extend beyond the secondary fluid inlet such that fluid in the region of the secondary fluid inlet may be retained by the rear side wall. In other words, the collection container does not have to completely enclose the suction jet pump. It is sufficient for the collecting container to extend into the region of the secondary fluid inlet, so that fuel can remain in this region in the event of an emergency driving situation.

The inclined edge of the first U-shaped part and/or the second U-shaped part of the collecting container is preferably inclined at an angle of at least 30 °, more preferably at least 35 °, most preferably at least 40 °, compared to the underside of the suction jet pump. As mentioned above, an angle of 45 ° may be sufficient to compensate for accelerations up to 1g, which helps to reduce fuel losses in most driving situations. In fact, tests carried out by the applicant have shown that even smaller angles can be used to reduce the fuel loss of the suction jet pump.

In form, the collection container has a snail or spiral shape when viewed from above, the collection container preferably surrounding the suction jet pump by at least 450 °. In other words, the collecting container has a labyrinth shape when viewed from above, thereby preventing fuel from leaving the area around the secondary fluid inlet in an emergency driving situation.

In this embodiment, preferably, at least one of the outer walls of the snail-shaped or spiral shaped collection vessel comprises at least one fuel inlet opening for feeding fuel from the outside (i.e. from the volume of the tank) into the inner volume of the collection vessel.

Drawings

Preferred embodiments of the present disclosure are explained below in the context of the drawings.

Fig. 1a to 1d show a first embodiment of the present disclosure;

fig. 2a to 2c and 3a to 3c show a second embodiment of the present disclosure; and fig. 4 shows a fuel tank with a suction jet pump known from the prior art.

Detailed Description

Fig. 4 has been described in the introduction to the present application.

As shown in fig. 4, the ejector pump assembly of the present invention may be used with the ejector pump 12 on the secondary side 104 of the fuel tank 100. The suction jet pump 12 may also be referred to as a suction jet pump.

A simple embodiment of the collecting container 20 is shown in fig. 1a to 1 d. The collecting container 20 has a U-shaped cross-section when viewed from above. The collection container 20 surrounds the primary fluid inlet 14 of the suction jet pump 12 and the sidewalls 28a, 28b of the collection container 20 extend beyond the area of the secondary fluid inlet 16 so that fluid can be retained by the sidewalls in this area.

The two side walls 28a, 28b of the U-shaped portion 25 of the collecting container 20 have an inclined shape, the highest point of which is at the rear side wall 26 of the U-shaped portion 25. Preferably, the inclined edges of the side walls 28a, 28b are inclined at an angle of at least 40 ° when compared to the underside of the suction jet pump (i.e. the plane of the tank bottom). The highest point of the side walls 28a, 28b is at the rear side wall 26 of the U-shaped portion 25.

On the opposite side, the collecting container has a fuel inlet opening 24 for supplying fuel from the outside to the inner volume 22 of the collecting container 20.

The mesh-like element surrounding the secondary fluid inlet 16 acts as a filter to avoid larger objects entering the fluid inlet 16.

In contrast to the collecting container 20 shown in fig. 1a to 1d, the collecting container 20 of fig. 1d has a second U-shaped section 30 arranged at an angle of 90 ° with respect to the first U-shaped section, whereby one side wall 34a of the second U-shaped section 30 is connected with one side wall 28a of the first U-shaped section 25. At least one upper edge 34b of the second U-shaped portion 30 of the collecting container 20 may have an inclined shape, the highest point of which is at the rear side 32 of the second U-shaped portion 30. By means of this second U-shaped section 30, acceleration forces in the second direction can be compensated, so that fuel losses in the suction jet pump 12 can be prevented in most driving situations.

A second embodiment of the invention is shown in fig. 2a to 2 c. Here, the collecting container 20 has a snail shape or a spiral shape when viewed from above, whereby the collecting container 20 surrounds the suction jet pump 12 at least 450 °. Thus, as best seen in fig. 2b, the collection container 20 has a labyrinth shape, preventing fuel from escaping the interior of the collection container 20.

As can be seen in fig. 2c, the collecting container 20 has at least two fuel inlet openings 24 for supplying fuel from the outside to the inner volume 22 of the collecting container 20.

Fig. 3a to 3c show some typical driving situations. For example, as shown in FIG. 3a, during a sharp turn, the fuel is pressed against the rear sidewall 26 of the first U-shaped portion 25 of the collection container 20. This may be the most urgent driving situation because the acceleration force is directed against the direction in which the suction jet pump 12 delivers fuel through the fluid outlet 18. Therefore, in such important driving situations, it is important to prevent fuel from escaping over the rear side wall 26 of the first U-shaped portion 25 of the collecting container 25. Thus, the first U-shaped portion 25 has a highest point at the rear side 26, whereby the side walls 28a, 28b have an inclined shape, the highest point of which is at the rear side 26 of the first U-shaped portion 25. As mentioned above, acceleration forces of up to 1g can be compensated for by using an angle of about 45 ° between the plane of the can bottom and the upper edge of the side wall 28 a.

In fig. 3b and 3c, acceleration forces in the direction perpendicular to fig. 3a are shown, which may occur during acceleration or deceleration.