Floating Cup Pump (Part 2) — Parts & Assembly

Previously on iHydrostatics N18, new topic of floating cup has been kicked off. Difference comparison between traditional piston principle and floating cup principle has been illustrated. The major specialization of FC is that the cylinder cup can float on the barrel plate while the traditional is all fixed. If you are interested in this post, please reply N18 in Wechat iHydrostatics to get the previous episode. Any questions are always welcomed, iEditor encourages you to leave your comments in iHydrostatics QQ Group: 426372753.


Floating Cup Pump Cross Section View [1]
Floating Cup, this total new idea for piston pump design, has triggered your appetite for more interests? Don’t be rush, iEditor will unveil the mystery of floating cup step by step. In this episode, we will go into the door of FC and discover more detailed secrets of FC parts and how it’s assembled.

1General Feature of FCMaybe you guys would have a little confusion about FC configuration, we can see different configurations in the pictures times to times. iEditor confused a little before, after some investigation, the general picture has formed in the mind.


– Fixed Displacement and Variable Displacement
For floating cup pump, both fixed displacement and varaible displacement have been designed as shown below:


Fixed and Variable Dispalcement FC Pump [2]


– In Phase and Out-of Phase Design
At the very beginning, FC design was with in phase layout; as for the deeper understanding going further, now new out-of phase design has been proposed:


In Phase and Out-of Phase FC Pump [2][4]


– Displacement Evolvement
As described in [3], “The first FC design studies have been performed for a rotary group with a nominal displacement volume of 10 cm3. The design was meant for an IHT and had 18 pistons. As the FC development, the first functional FC prototypes were 28 cm3 pumps with 24 pistons. Meanwhile. A rotary group of 50 cm3 floating cup is under development, which has 12 pistons arranged on each side as shown below” . [3]


50 cm3 with 12 Pistons on Each Side [3]
2Parts in DetailFirst of all, let’s take a whole view of this disassembled pump with fixed displacement configuration. The general parts are: housing, end cap, shaft with rotor, bearing, valve plate, piston, cup, barrel and rings.


Disassembled FC Pump [5]
For a typical FC pump, the outlet and inlet are integrated in the housing and end cap as shown below:


Integrated Outlet and Inlet of FC Pump [1]
For other parts in a typical FC configuration, check this video.

Typical FC Pump Parts [6]

3Floating Cup Pump AssemblyHere is a video to clearly show how floating cup pump is assembled:

Typical FC Pump Assembly [6]
4Floating Cup MoreTill now about FC pump, have you been satisfied thoroughly? Have you got the idea of FC parts and assembly? NO? OK, never mind, iEditor has prepared another feast for you, hope you will enjoy it.

FC Pump Presentation [6]
We have known why this pump is named “Floating Cup” pump, but do you know how it can float? What is the theory behind this to support its floating? Don’t go away, iEidtor will explain this to you in the next episode.

REFERENCES[1] INNAS. Floating Cup Principle 2012. www.innas.com.
[2] INNAS. Floating Cup Design Details. www.innas.com
[3] G.E.M. Vael, T.L. van den Brink, T. Paardenkooper, P.A.J. Achten. Some Design Aspects of the Floating Cup Hydraulic Transformer. Innas BV, Breda, The Netherlands.
[4] INNAS. Floating Cup Brochure. www.innas.com
[5] INNAS. Floating Cup Intro 2007. www.innas.com
[6] INNAS Website. www.innas.com

STATEMENTS[1]. Copyright of the pictures, videos and paragraphs quoted in this post belong to the original author.
[2]. iHydrostatics is only the platform to share but not create information, iHydrostatics post is NOT intended for academic research.
[3]. This post reprint should be noted with “iHydrostatics Original”.