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Enhancements for swash plate pumps

A swash plate pump and swash plate technology, applied in the direction of pumps, swing piston pumps, swing piston machines, etc., can solve problems such as hindering commercial development.

Inactive Publication Date: 2008-12-24
SWASHPUMP TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Problems with these types of pumps have currently hampered commercial development

Method used

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  • Enhancements for swash plate pumps
  • Enhancements for swash plate pumps
  • Enhancements for swash plate pumps

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0060] Example 1: Dynamic Balance

[0061] The problem is that as the swashplate is forced to repeatedly move (nutate) at the rotational frequency of the drive shaft (such as about 24 Hz for a drive force of 1200 rpm), the dynamic imbalance causes significant vibration and other undesirable effects.

[0062] For calculation purposes it is assumed that the pump has: a drive shaft with tapered roller bearings located 134 mm from the center of the swash plate; and a support or end shaft with cylindrical rollers located 124 mm from the center of the swash plate bearings. The non-rotating swash plate is assumed to be 20 mm thick and have an inclination of 15 degrees. The swash plate is supported at a center-to-center distance of 30mm by two tapered roller bearings. Materials: The shaft is austenitic (nickel alloy) SG cast iron and the swash plate is austenitic (nickel alloy) sheet cast iron.

[0063] The rotating parts (except the swash plate) are assumed to be dynamically balan...

example 2

[0074] Example 2: Radial Finger Seal

[0075] Problem: Ineffective sealing between the virtual chamber and the trailing chamber at the point of contact or near-contact motion between the leading swashplate and the adjacent portion of the cone leads to poor efficiency, especially when the pressure differential across the pump increases Time. Leakage of this type causes backflow, detracting from the efficiency of the pump.

[0076] Figures 11 and 12 illustrate the principle of providing a plurality of radially positioned sealing vanes embedded in a conical plate. Figure 11 is a view of a portion of a modified conical plate 108 fitted with a downwardly projecting seal vane 108 . Traditionally, each slot 1200 extends from the outer edge of the tapered plate almost to the inner edge, whereas in the example each slot is 70mm long with approximately 5mm of tapered plate movement at the inner edge. An example preferred number is about 30 blades spaced at 10 degree angles, although ...

example 3

[0080] Example 3: Port (A)

[0081] Problem: Divider plate and trunnion bearings can be maintained without dismantling the entire pump, ports are easily accessible from either side.

[0082] In such a form as described in Figures 6, 7, 8 and 9, the ports are mounted centripetally on the divider cover on the divider; ( Picture 1-1 60), the cover also includes an easily removable window to the interior of the swash pump. Bolts or cap screws 161 and 161A secure the cover in place, preferably with spacers present. This cover has been found to be a very convenient inspection port, allowing inspection (see FIG. 9 ) of the divider plate 140, trunnion 141, and components of the swash plate 130, or to allow replacement of the trunnion assembly and / or divider plate without having to disassemble all parts. the remainder of the pump. The divider is seated below the cover, in a groove (142 in Figure 14A), and forms a seal against the lower surface. In FIG. 6 , the cover 160 is shown i...

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Abstract

A swash-plate pump for fluids uses counterbalancing means within the rotating drive shaft to minimise vibration caused by the couple of the nutating swash plate. Resilient internal seals include radial vanes extending from the cone plate to contact the adjacent side of the swash plate, and a peripheral ring seal between the swash plate and the inner spherical part of the outer housing, to raise efficiency by reducing backflow. Resilient seals reduce the need for precision, so many plastics parts may be used. Carbon fibre leaf valves aid efficiency.

Description

technical field [0001] The present invention relates to a slanted-axis rotating device having a swash plate, also known as a wobble plate or nutating disk, which interacts with a fluid, and particularly for use as a fluid pump time to optimize this device. Background technique [0002] The concept of a swashplate device has been previously described by Paker in US3942384 (referring to swashplate devices for use as engines as well as pumps), in Paker's US5735172 (particularly regarding lubrication), and elsewhere. Parker's intellectual property is used as the basis for this application. More recently, McMaster et al. (US6390052) described a lubricated "wobble plate engine", the present reference to this invention also being used as a pump, and briefly described a radial seal similar to that which will be described in this patent. A sealing device. [0003] Other known forms of pumps with similar applications include: centrifugal rotor pumps, such as those used in refrigera...

Claims

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Application Information

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IPC IPC(8): F04C9/00F04C21/00
Inventor L·达尔齐尔B·F·斯密特L·勒诺克
Owner SWASHPUMP TECH
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