FLUID-CONVEYING DEVICE WITH VALVES FOR CONTROLLING THE FLUID FLOW

Abstract

A fluid-conveying device for conveying a fluid, such as in particular water, from a tank. The fluid can be conveyed along a dosing line to an injection point by a pump, wherein the dosing line is attached at a pressure side of the pump by a connection plug which is attached to an outlet line. The fluid-conveying device has at least one first valve, which is preloaded by a spring and which is configured to prevent a fluid flow from the dosing line to the outlet line and which is furthermore configured to permit the fluid flow from the outlet line to the dosing line if a predefined minimum pressure p1 is reached on that side of the first valve which faces toward the outlet opening.

Claims

1. A fluid-conveying device configured to convey a fluid from a tank along a dosing line to an injection point by a pump, wherein the dosing line is attached at a pressure side of the pump by a connection plug attached to an outlet line, comprising: at least one first valve preloaded by a spring and configured to: prevent a fluid flow from the dosing line to the outlet line and permit the fluid flow from the outlet line to the dosing line if a predefined minimum pressure p1 is reached on that side of the at least one first valve that faces toward the outlet line opening.

2. The fluid-conveying device as claimed in claim 1, wherein the at least one first valve is arranged within the outlet line.

3. The fluid-conveying device as claimed in claim 1, wherein the outlet line has on its end region the connection plug configured to attach to the dosing line, wherein the at least one first valve is integrated in the connection plug.

4. The fluid-conveying device as claimed in claim 1, further comprising: a second valve configured to allow a fluid flow from the dosing line in a direction toward the outlet line if a second pressure p2 acts on the second valve from the side of the dosing line.

5. The fluid-conveying device as claimed in claim 4, wherein the predefined minimum pressure p1, at which the at least one first valve opens, is lower than the second pressure p2, at which the second valve opens.

6. The fluid-conveying device as claimed in claim 4, wherein the dosing line is in fluid communication with a discharge line by the second valve and/or is in fluid communication with the tank by way of a bypass.

7. The fluid-conveying device as claimed in claim 4, wherein the at least one first valve and the second valve are arranged in the connection plug.

8. The fluid-conveying device as claimed in claim 4, wherein the at least one first valve and the second valve are arranged parallel to one another in a common line, wherein the common line is subdivided by the at least one first valve and the second valve into two line sections with opposite flow directions.

9. The fluid-conveying device as claimed in claim 1, wherein a bypass branches off on a side of the at least one first valve that faces away from the outlet line, wherein the bypass leads into surroundings and/or back into the tank storing the fluid.

10. The fluid-conveying device as claimed in claim 1, wherein the connection plug is configured to connect the dosing line to the outlet line, wherein the connection plug has coupling elements designed in accordance with SAE and/or VDA standards.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The invention will be discussed in detail below on the basis of exemplary embodiments with reference to the drawings. In the drawings:

[0028] FIG. 1 is a sectional view through a schematic illustration of a dosing line and an outlet line, with two valves being shown, wherein one valve influences the fluid flow into the dosing line and the other valve influences the backflow into a bypass;

[0029] FIG. 2 shows a sectional view through a schematic illustration of the dosing line and the outlet line, wherein both valves are arranged in a common flow channel;

[0030] FIG. 3 shows a sectional view through a schematic illustration of the dosing line and the outlet line, with two valves being shown, wherein one valve influences the fluid flow into the dosing line and the other valve influences the backflow into a bypass, wherein one valve is arranged in the connection plug and the second valve is arranged in a separate connection region;

[0031] FIG. 4 shows a sectional view as in FIG. 3, wherein both valves are arranged in the region of the outlet line;

[0032] FIG. 5 shows a sectional view as in FIG. 2, wherein both valves are arranged in the region of the outlet line;

[0033] FIG. 6 shows a sectional view as in FIG. 2, wherein both valves are arranged in the region of the dosing line;

[0034] FIG. 7 shows a sectional view through a dosing line and an outlet line connected thereto, wherein the valve is arranged at the transition between the dosing line and the outlet line; and

[0035] FIG. 8 shows a sectional view as in FIG. 7, wherein the valve is arranged in the region of the outlet line.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

[0036] FIG. 1 shows a schematic view of a dosing line 1 which is fluidically connected to an outlet line 3 of the fluid-conveying device by way of a connection plug 2. By a pump, a fluid, preferably water, can be conveyed from a tank to a dosing line 1 via the outlet line 3, which is arranged on the pressure side of the pump. The dosing line 1 and the outlet line 3 are fluidically connected to one another preferably via a connection plug 2.

[0037] FIG. 1 shows two valves 4, 5, wherein the first valve 4 is arranged in the connection plug 2 and, from a certain pressure level in the outlet line 3, allows the fluid flow to the dosing line 1.

[0038] The reference sign 5 denotes the second valve, which branches off from the connection plug 2 and, from a certain pressure in the region of the dosing line 1, permits the fluid flow from the dosing line 1 to a bypass line, which leads for example into the tank or into the surroundings.

[0039] FIG. 2 shows a view similar to FIG. 1. Also, the same reference signs denote identical elements here. This also applies to the figures that follow. In FIG. 2, both valves 4, 5 are arranged within a common flow channel in the connection plug 2. The first valve 4 in this case again opens up the flow path from the outlet line 3 to the dosing line 1, and the second valve 5 opens up the flow path from the dosing line 1 to the outlet line 3, when the respective pressure conditions for opening the valves preloaded by a spring force are realized.

[0040] FIG. 3 shows a view similar to the view in FIG. 1. The first valve 4 is in this case arranged in the transition region between the connection plug 2 and the outlet line 3 and thus slightly closer to the pump, which follows the outlet line 3.

[0041] FIG. 4 shows an arrangement of the two valves 4, 5 in the region of the outlet line 3, wherein the first valve 4 is arranged in the flow section formed by the outlet line 3 and the second valve 5 branches off therefrom to a bypass line.

[0042] FIG. 5 shows an arrangement of the two valves 4, 5 completely in the outlet line 3, wherein the valves 4, 5 are arranged in the flow section formed by the outlet line 3 and subdivide the latter into two flow channels, which, according to the properties of the valves 4, 5, can be opened up in in each case one direction.

[0043] FIG. 6 shows an arrangement of the two valves 4, 5 as has already been shown in FIG. 5, wherein the valves 4, 5 are now arranged within the connection plug 2 and subdivide the flow section formed in the connection plug 2 into two flow channels.

[0044] FIG. 7 shows an arrangement of the dosing line 1 and the outlet line 3 with only one valve 4. Said valve 4 is arranged within the connection plug 2 and can permit a fluid flow from the outlet line 3 to the dosing line 1 if a correspondingly high pressure prevails in the outlet line 3.

[0045] FIG. 8 shows an alternative configuration of the exemplary embodiment in FIG. 7, wherein the valve 4 is arranged within the outlet line 2 and thus closer to the pump.

[0046] The different features of the individual exemplary embodiments can also be combined with one another.

[0047] The exemplary embodiments in FIGS. 1 to 8 have in particular no limiting character and serve to illustrate the concept of the invention.

[0048] 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.