US3715917A - Non-round fluid dynamometer - Google Patents

Non-round fluid dynamometer Download PDF

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Publication number
US3715917A
US3715917A US00181358A US3715917DA US3715917A US 3715917 A US3715917 A US 3715917A US 00181358 A US00181358 A US 00181358A US 3715917D A US3715917D A US 3715917DA US 3715917 A US3715917 A US 3715917A
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US
United States
Prior art keywords
housing
round
fluid
dynamometer
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00181358A
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English (en)
Inventor
J Bronder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avco Corp
Original Assignee
Avco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avco Corp filed Critical Avco Corp
Application granted granted Critical
Publication of US3715917A publication Critical patent/US3715917A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
    • G01L3/1485—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving fluidic means

Definitions

  • This invention relates to a novel fluid dynamometer which uses a non-round stator housing within which the rotor is mounted, and is particularly concerned with water dynamometers.
  • water dynambmeters comprise a stator and a rotor with restricted fluid passages therebetween, the stator being supported within a housing having a circular inner cross section.
  • the rotor is driven by a device under test, and upon the introduction of the fluid into the housing the fluid absorbs the energy, and hence the rotor presents a torque to the device under test.
  • problems include high frequency vibratory conditions at various speeds and excessive cavitation. Such conditions limit the range of operability of the dynamometer and also tend to adversely affect its useful life.
  • the present invention is an improvement over the known prior art fluid dynamometers in that it provides a non-round inner housing geometry.
  • This geometry provides a changing radial distance between the inner wall and the axis of rotation, thereby preventing the formation of a uniformaly rotating fluid core.
  • the nonround housing serves to redirect the fluid mass so as to generate forces that result in high torque absorption for a given water dynamometer rotor, less fluctuation of absorbed torque, a better mixture of the working fluid, and an increase in the useful range of operational torque.
  • the primary object of this invention is to provide an improved fluid dynamometer having a non-round inner housing geometry.
  • Another object of this invention is to provide a fluid dynamometer having an inner housing geometry which has a polygonal cross section.
  • FIG. 1 shows a cross section of a water dynamometer taken through the line 1-1 in FIG. 2;
  • FIG. 2 is a cross section taken through the line 2-2 in FIG. 1.
  • the illustrated fluid dynamometer is a water brake having an outer cylindri cal housing and a non-round inner housing 12 positioned within the cylindrical housing secured in fixed space thereto, the space between the housing forming a chamber 13.
  • the non-round inner housing 12 supports a plurality of conventional apertured stator disks 14 between which are interleaved a plurality of apertured rotor disks 16.
  • the rotor disks 16 are fixed to a rotatable shaft 18 supported at both ends in bearings 20. (The bearings at only one end are shown.)
  • the inner housing 12 is non-round in its cross section taken in a planeperpendicular to the axis of the shaft 18.
  • the shaft 18 is adapted to be driven through a conventional coupling 24 by a device under test (not shown). Water is admitted to the inner housing through an inlet 26. It is exhausted from the non-round inner housing 12 to the chamber 13 through apertures 28 and is exhausted from the chamber 13 through an outlet 30.
  • a device to be tested mechanically is coupled to the shaft 18 by means of coupling 24. Simultaneously water is admitted to the interior of the inner housing through the inlet 26 where it is acted upon by the rotors 16 so that the water absorbs energy in the form of heat. The hot water is then exhausted through a number of ports 28 into the chamber 13 between the inner and outer housings and is exhausted through the outlet 30.
  • the radial distance between the axis of the shaft 18 and the inner surfaces of the inner housing 12 are a function of angular position. This means that as the rotor is rotated the tendency of the water to rotatively follow the rotor is prevented since the direction of movement of the water is radially changed. The action on the water between the rotor and the inner housing causes a breaking up of any water layer that may form because of generation of higher turbulence. In addition, because of the change of mass flow direction, there is a general increase in the power absorption capability of the device and a better distribution of the power absorption throughout the brake.
  • the illustrated embodiment shows a water dynamometer having an inner cross section which is substantially square, it will be understood that other non-round inner cross sections may also be advantageous.
  • the cross section may be rectangular or elliptical or it may be a polygon having a greater or lesser number if sides.
  • a fluid dynamometer comprising:
  • stator disks interleaved with said rotor disks, said stator disks being fixedly supported from said housing, the radial distance from the axis of said shaft to the periphery of the cross section of said [inner] housing taken in a plane perpendicular to said shaft being non-uniform;
  • inlet means for admitting [water] fluid to said housing

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Hydraulic Turbines (AREA)
  • Braking Arrangements (AREA)
  • Motor Or Generator Frames (AREA)
US00181358A 1971-09-17 1971-09-17 Non-round fluid dynamometer Expired - Lifetime US3715917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18135871A 1971-09-17 1971-09-17

Publications (1)

Publication Number Publication Date
US3715917A true US3715917A (en) 1973-02-13

Family

ID=22663951

Family Applications (1)

Application Number Title Priority Date Filing Date
US00181358A Expired - Lifetime US3715917A (en) 1971-09-17 1971-09-17 Non-round fluid dynamometer

Country Status (7)

Country Link
US (1) US3715917A (en:Method)
JP (1) JPS4839084A (en:Method)
DE (1) DE2236021A1 (en:Method)
FR (1) FR2153894A5 (en:Method)
GB (1) GB1345851A (en:Method)
IT (1) IT965367B (en:Method)
SE (1) SE371012B (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864872A (en) * 1988-06-13 1989-09-12 Stahl Jere F Hydraulic dynamometer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57199451A (en) * 1981-06-03 1982-12-07 Hitachi Ltd Detector for flashover of rotary electric machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4864872A (en) * 1988-06-13 1989-09-12 Stahl Jere F Hydraulic dynamometer

Also Published As

Publication number Publication date
DE2236021A1 (de) 1973-03-29
GB1345851A (en) 1974-02-06
JPS4839084A (en:Method) 1973-06-08
IT965367B (it) 1974-01-31
SE371012B (en:Method) 1974-11-04
FR2153894A5 (en:Method) 1973-05-04

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