Screen for hydraulic fluid

Abstract

The invention relates to a high-pressure hydraulic fluid screening element (1) for inserting into a hydraulic line or into a hydraulic connection of a hydraulic device, having an annular main body (2), which is aligned with respect to its axis of rotation (9) in a longitudinal direction (5). The outside diameter of the main body (2) is greater than its axial length. The inner cross section of the main body (2) is covered over by a screening region (3), which is provided with a multiplicity of apertures (4). In this case, the main body (2) and the screening region (3) are produced integrally by the powder injection-molding process.

Claims

1. A hydraulic fluid screening element for insertion into a hydraulic line, comprising: a main body having a screen that covers an inner cross section of the main body across a bottom of the main body and is formed integrally with the main body; the screen having an inlet side and and outlet side, wherein the outlet side extends across the bottom of the main body; and apertures extending through the screen from the inlet side to the outlet side, wherein the apertures have a cross section that widens from the inlet side to the outlet side; wherein the inlet side of the screen is formed as a convex dome in relation to the bottom of the main body, the outlet side of the screen is formed in cross section substantially to a segment of circle, and the screen closes off the bottom of the main body; wherein the main body has a conical surface in a form of a frustum of a cone such that the main body has a smallest diameter abutting the screen.

2. The hydraulic fluid screening element of claim 1 wherein the apertures have a form of a kidney shape and are arranged in multiple concentric circles.

3. The hydraulic fluid screening element of claim 1 wherein the main body tapers in a direction of throughflow of hydraulic fluid to be screened.

4. The hydraulic fluid screening element of claim 1 wherein the apertures form multiple concentric circular regions and transitions between a set of multiple circular regions of the convex dome formed by the screen that are stepped.

5. The hydraulic fluid screening element of claim 1 wherein the hydraulic fluid screening element is produced by a powder injection-molding process.

6. The hydraulic fluid screening element of claim 1 wherein the hydraulic fluid screening element is produced from a material selected from a group consisting of a stainless metal and stainless metal alloy by a Metal-Injection-Molding (MIM) process.

7. The hydraulic fluid screening element of claim 4 wherein the apertures have rounded edges.

8. The hydraulic fluid screening element of claim 1 wherein each of the apertures are conically formed.

9. The hydraulic fluid screening element of claim 1 wherein when the screening element is positioned in the hydraulic line, the apertures determine a direction of throughflow through the inlet side to the outlet side.

10. The hydraulic fluid screening element of claim 1 wherein each of the apertures extend through the screen in a longitudinal direction.

11. The hydraulic fluid screening element of claim 1 wherein the main body extends upwardly from the screen such that the outlet side of the screen is at a bottommost position of the main body in a manner of a bottom of a cup.

12. The hydraulic fluid screening element of claim 1 wherein the screen is convexly stepped counter to an intended direction of throughflow on the inlet side.

13. The hydraulic fluid screening element of claim 12 wherein the apertures form multiple concentric circular regions between circular regions of the screen that are stepped.

14. A hydraulic fluid screening element for insertion into a hydraulic line, comprising: a main body shaped in a form of a frustrum of a cone, wherein a bottom of the main body has a smallest diameter; a screen having an inlet side and an outlet side, wherein the screen is formed in cross section substantially to a segment of a circle; the screen closes off the bottom of the main body in a manner of a cup between an inlet side and an outlet side of the hydraulic fluid screening element, wherein the outlet side extends across the bottom of the main body below the inlet side of the screen; and apertures extend through the screen from the inlet side to the outlet side of the screen, wherein the apertures have a cross section that widens from the inlet side to the outlet side; wherein the screen is convexly stepped in a shape of a convex dome in relation to the bottom of the main body on the inlet side; wherein the apertures form multiple concentric circular regions between circular regions of the screen that are stepped.

15. A hydraulic fluid screening element for insertion into a hydraulic line, comprising: a main body shaped in a form of a fustrum of a cone; a screen that closes off the main body across a bottom of the main body, wherein the main body has a smallest diameter abutting the screen; the screen having an inlet side and outlet side, wherein the outlet side extends across and between the bottom of the main body and is positioned below the inlet side of the screen; and apertures extending through the screen from the inlet side to the outlet side, wherein the apertures have a cross section that widens from the inlet side to the outlet side; wherein the screen is convexly stepped in a shape of a convex dome in relation to the bottom of the main body on the inlet side.

16. The hydraulic fluid screening element of claim 15 wherein each of the apertures extend through the screen in a longitudinal direction.

17. The hydraulic fluid screening element of claim 15 further comprising the hydraulic fluid screening element positioned in the hydraulic line such that the apertures determine a direction of throughflow through the inlet side to the outlet side.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 shows a perspective view of a first exemplary embodiment of the hydraulic fluid screening element according to the invention;

(2) FIG. 2 shows a sectional view of a hydraulic fluid screening element according to FIG. 1;

(3) FIG. 3 shows a perspective view of a second exemplary embodiment of the hydraulic fluid screening element according to the invention; and

(4) FIG. 4 shows a sectional view of a hydraulic fluid screening element according to FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) In FIGS. 1 and 2, an embodiment of the hydraulic fluid screening element 1 according to the invention, which has a generally disc-shaped design, is represented in a perspective view. For example, it has a conical, annularly formed main body 2 in the form of the frustum of a cone, which is covered over its inner cross section by a screening region 3. The screening region 3 is provided with a multiplicity of apertures 4, which by way of example have the form of a kidney or the form of a curved oval and are arranged in multiple concentric circles. In this case, the apertures 4 are conically formed, the screening element 1 preferably being inserted into a hydraulic line in such a way that the side with the smaller passage cross sections forms the inlet side or inflow side 6 of the screening element 1, and accordingly the opposite side with the greater passage cross sections forms the outlet side or the outflow side 7 of the screening element. The preferably conical apertures 4 then determine the direction of throughflow of the hydraulic fluid to be screened, which coincides with the direction of the arrow 5. This direction also defines the longitudinal direction 5 of the hydraulic fluid screening element 1.

(6) In FIG. 3, a further exemplary embodiment of the hydraulic fluid screening element 1 according to the invention is represented in a perspective view, the same reference numerals having been assigned for the same elements as in the case of the exemplary embodiment of FIGS. 1 and 2. As a difference from the first exemplary embodiment, the exemplary embodiment shown in FIGS. 3 and 4 has a conical main body 2 in the form of a frustum of a cone and a screening region 3, which closes off the main body 2 in the manner of the bottom of a cup or a lid on one side, here the outlet side 7 of the screening element 1. The screening region 3 is provided with apertures 4, which by way of example have the form of a kidney or the form of a curved oval and are arranged in multiple concentric circles. The apertures 4 in a particular circle of the concentric circles are larger than the apertures 4 in another circle of the concentric circles, and in this way larger apertures 4 present a larger diameter circle of the concentric circles in comparison to those in a smaller diameter circle.

(7) FIG. 4 shows a cross section through the hydraulic fluid screening element 1 according to the invention shown in FIG. 3 in a perspective view. The conical main body 2 tapers in the direction of throughflow of the hydraulic fluid to be screened, which coincides with the direction of the arrow 5. This direction defines its operational inlet side 6 and outlet side 7 for the hydraulic fluid.

(8) In the case of this exemplary embodiment of FIG. 3, the screening region 3 of the hydraulic fluid screening element 1 is formed as a dome, the inlet side 6 being convexly stepped counter to the intended direction of throughflow and the outlet side 7 corresponding in cross section substantially to a segment of a circle. Substantially means here that other, curved arc shapes are also permissible and that, in certain regions, for instance at the transition from the screening region 3 to the main body 2 or in the central region 10 thereof, there may be deviations from the form of a dome, as can be seen in the cross section shown in FIG. 4. The dome formed by the screening region 3 is consequently arranged in such a way that it resists the flow and the pressure of the hydraulic fluid, which increases its load-bearing capacity.

(9) The apertures 4 in the screening region 3 are for example kidney-shaped and arranged in multiple concentric circular regions. The transitions between the respective circular regions are stepped, the edges of the steps 8 being rounded. The apertures 4 have in the direction of throughflow 5 a cross section that widens in the direction of flow. The cross section of the apertures 4 consequently increases in the direction of flow of the hydraulic fluid. The edges of the apertures 4 are preferably rounded, which in FIG. 4 is represented by way of example in the sectional representation.

(10) On account of their shaping and being produced by the powder injection-molding process, the hydraulic fluid screening elements 1 shown by way of example in these exemplary embodiments are particularly simple and robust, and consequently particularly suitable for use in hydraulic systems, which are for example operated under high pressure. They do not have a tendency for cracks to form or individual particles to become detached, even under high and alternating loading, and moreover can be easily fitted, in particular by pressing in, especially in the case of a conical structural form, and, on account of the conical apertures, can also be easily cleaned. The hydraulic fluid screening elements 1 are alternatively formed by MIM, additive manufacture, additive manufacturing 3D printing in metal or bi-metal, 3D printing by way of layer forming, or sintering.