This application is a national phase application of PCT/IB2007/001953 filed on Jul. 11, 2007 which in turn claims priority from Swiss application 01119/06, filed on Jul. 11, 2006, each of which are incorporated by reference herein in their entirety.
The invention relates to a cylinder piston arrangement according to the preamble of claim 1. Cylinder piston arrangements of this kind are present on the market, especially as high pressure water pumps.
An essential application for pumps of this kind is the pressure conveyance of water loaded with foreign particles, especially abrasive granulates. Particularly, high speed turbines with high working pressures in the range of a few hundred up to one thousand bar are required. Therefore, the energetic as well as the volumetric efficiency factors are of great importance.
The objective of the invention is therefore to provide pumps, respectively fluid engines, with high efficiency factors of the above-mentioned kind as well as with high durability. The solution of this objective is defined by the features of the claim 1.
Further embodiments and variants, that are not in any case realizable, result from the features and the combinations of features, respectively, by the combination of the subclaims, as the case may be, by including optional features or combinations of features.
Axially expanding tube diaphragm pistons with internally working chambers offer the basis for a robust construction with high wear resistance, also in operation with abrasive fluids. However, generally in this case, relatively large clearance volumes need to be kept due to constructive reasons, which affects the volumetric efficiency factor disadvantageously. Exactly this problem is solved by the invention, namely with the help of clearance volume displacers. All in all, the invention makes a widely optimized type of construction possible.
The invention will further be described with reference to the exemplary embodiment schematically shown in the drawings, which show:
In the embodiment 10 according to
On the side of the working chamber AR, a basically cylindrical clearance volume displacer TK1 is connected with the axially expanding tube diaphragm piston ASK, which is shown here in the upper dead center position and obviously results in a substantial reduction of the operative clearance volume.
For describing the operating mode of this construction, it is to be referred to the already provided depiction in the
There the time diagram shows in
In contrast, the clearance volume displacer TK1, intruding according to
In the embodiment 10 according to
Inlet valve EV and outlet valve AV are constructed analogously to the embodiment 10 according to
Particularly advantageously appears in this embodiment 10, that for the displacer TK2a an internal flow-through and an external circulation flow of the working fluid with a flow redirection in an opening or end area of the clearance volume displacer TK2a is provided. By this, inter alia, an extra intensive purging of the working chamber AR and the valves regarding accumulation of residues and impurities, but also of compression attenuating air enclosures after longer dead times, is made possible.
In the embodiment 10 according to
In the embodiment 10 according to
Additionally, a valve construction according to
Number | Date | Country | Kind |
---|---|---|---|
1119/06 | Jul 2006 | CH | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/IB2007/001953 | 7/11/2007 | WO | 00 | 10/23/2009 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2008/007209 | 1/17/2008 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
1942417 | Ferlin et al. | Jan 1934 | A |
2606032 | Warren | Aug 1952 | A |
3227093 | Taplin | Jan 1966 | A |
3250225 | Taplin | May 1966 | A |
3309013 | Helmut | Mar 1967 | A |
3311028 | Taplin | Mar 1967 | A |
3375759 | Smith | Apr 1968 | A |
4172465 | Dashner | Oct 1979 | A |
4248403 | Scull | Feb 1981 | A |
4718893 | Dorman et al. | Jan 1988 | A |
4741252 | Harter et al. | May 1988 | A |
4749342 | Fritsch | Jun 1988 | A |
4773305 | Nissels | Sep 1988 | A |
5005465 | Boehm et al. | Apr 1991 | A |
5027784 | Osawa et al. | Jul 1991 | A |
5088898 | Fukumoto et al. | Feb 1992 | A |
5251664 | Arvidsson et al. | Oct 1993 | A |
6048183 | Meza | Apr 2000 | A |
7278836 | Hammonds | Oct 2007 | B2 |
7293967 | Fukano et al. | Nov 2007 | B2 |
Number | Date | Country |
---|---|---|
2914694 | Jan 1980 | DE |
19648408 | May 1998 | DE |
19648408 | May 1998 | DE |
0222131 | May 1987 | EP |
2375466 | Jul 1978 | FR |
2375466 | Jul 1978 | FR |
Entry |
---|
NPL English machine translation of foreign French patent, Jean-Jacques Carre et al, FR 2375466A1, “Hydraulic Pump”, published Jul. 21, 1978; downloaded from http://worldwide.escapenet.com. |
International Search Report of Application No. PCT/IB2007/001953, dated Dec. 28, 2007. |
Number | Date | Country | |
---|---|---|---|
20100119394 A1 | May 2010 | US |