US2316021A - Air log - Google Patents
Air log Download PDFInfo
- Publication number
- US2316021A US2316021A US406015A US40601541A US2316021A US 2316021 A US2316021 A US 2316021A US 406015 A US406015 A US 406015A US 40601541 A US40601541 A US 40601541A US 2316021 A US2316021 A US 2316021A
- Authority
- US
- United States
- Prior art keywords
- impeller blade
- shaft
- hub
- hub portion
- impeller
- 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
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/10—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects using rotating vanes with axial admission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
- G01P5/06—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer using rotation of vanes
- G01P5/07—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer using rotation of vanes with electrical coupling to the indicating device
Definitions
- This invention relatesto i'devices having an impeller .which is driven by lluid flow.
- It relates especially to uid flow meters, distance logs or odometers and the like, in lwhich the speed at which the impeller is driven is used as a measure of the rate of fluid flow.
- Such instruments are desirably small and lightly constructed, -with impeller blades which are conveniently sheet steel stampings.
- the object of the invention is a means of adjusting the performance of such a device to a given standard.
- a more specific object of the invention is a means of adjusting the pitch of the impeller so that the instrument will conform to the desired standard of response.
- screw means are provided for adjusting the pitch of the impeller yblade by bending deflection of its hub portion in a direction longitudinally of its supporting shaft, in a Iplane containing the shaft axis and normal to the center line of the impeller blade.
- the drawing shows the application of the invention to an air log for measuring the distance traversed by an airplane relatively to the ambient a1r.
- Figure 1 is a View of the device in part-sectional elevation.
- Figure 2 is a View on line 2 2 of Figure 1.
- Figure :3 is a view on line 3-3 of Figure l.
- Figure 4 is a sectional view on line 4-4 of Figure 1.
- Figure 5 is an enlarged View of part of Figure 4 showing the manner in which the pitch off the impeller blade is adjusted by bending deflection of its hub portion.
- the impeller blade I has a hub portion 2, secured to a hub l3, on a shaft 4 which has end pivots supported in adjustable jewel bearings 5 and l6 in a housing 1 and a housing 8 respectively, which are connected together by a U- shaped .portion lo whichwin not interfere with turning of the impeller blade.
- That portion of the shaft 4 within the housing 1 is provided with a worm I2, engaging a worm Wheel I4, on a cross shaft I5, on which there is a cam I6 which lifts the spring arm Il of a point I8 of a conta-ct breaker away from a stationary point I9 thereof, once for a definite number of revolutions of the shaft 4.
- the points I8 and I9 of the contact breaker are arranged to make and break an electrical circuit through an electromagnetic counter (not shown), and since the number of revolutions of the shaft 4 is proportionate to the rate of air flow driving the impeller, the distance traversed relatively to the air by an airplane on which the air log may be mounted will be indicated by the counter reading, provided the instrument is properly calibrated. Calibration can be effected by comparison and adjustment of the device to a known standard in a wind tunnel or in any other suitable way.
- the instrument is provided with only one impeller blade, and its circular hub portion 2 is secured to the hub 3 by two rivets 22 and 23, at spaced points along a line parallel to and removed from the center line of the impeller blade on one side of aplane -b containing the shaft axis and the center line of the impeller blade, as shown most clearly in Figure 2.
- the hub 3 is chamfered at 25 and scooped away at 26 to remove weight to balance the rotor assembly about the shaft axis in the manner shown best in Figures 1 and 3.
- a screw 28 is in screw threaded engagement with the hub 3 on that side of the plane a-b of Figure 2 opposite tothe rivets 2 Zand 23, and adjustably extends therethrough, parallel to the shaft 4, to bear against the hub portion 2 of the impeller blade.
- the screw 28 provides for the required delicate adjustment of the pitch of the impeller blade. As shown in Figure 5, it may be screwed through the hub 3 to bend the hub portion 2 away from the hub 3 and thereby adjust the pitch of the blade.
- a spring 30 is provided as a backing for the hub portion of the impeller blade. As shown, the spring 30 is secured to the hub 3 by the rivets 22 and 23 with the hub portion 2 of the impeller blade therebetween. It serves to resiliently oppose bending deflection of the hub portion of the impeller blade, to hold it against the screw 28, and to return it to its original ilat position against the face of the hub 3 upon retraction of the screw 28, in the event that the material of the hub portion of the impeller blade is insuiciently springy to assure this.
- a shaft an impeller blade with a bendable hub portion extending substantially normal to the axis of said shaft on opposite sides of a plane containing the shaft axis and the center line of the impeller blade, said hub portion of the impeller blade being attached to the shaft only on one side of said plane along a line parallel to and removed from the center line of the impeller blade, and screw means on the other side of said plane for adjusting the pitch of the impeller blade by bending deflection of its hub portion about its line of at'- tachment to the shaft.
- the screw adjusting means including a screw in screw threaded engagement with one of said hubs and adjustably extending therethrough, parallel with said shaft, to exert a thrust on the other of said hubs, whereby the bendable hub portion of the impeller blade is bent to effect the required adjustment of the pitch thereof.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Measuring Volume Flow (AREA)
Description
April 6, 1943. E. v. RIPPINGILLE 2,316,021
` AIR LoG Filed Aug. 8, 1941 "IIS,
Bu 4 MEV;- Gttornegs Stwentor u Patented Apr. 6, 1943 VfRippingille, DetroitfMich., assignor to A,(reneral- Motors Corporation, Detroit, Mich., a
corporation of Delaware ll'AipliatimiAugust s, 1941, seria1No.4os,o`15
., 4 Claims.
This invention relatesto i'devices having an impeller .which is driven by lluid flow.
It relates especially to uid flow meters, distance logs or odometers and the like, in lwhich the speed at which the impeller is driven is used as a measure of the rate of fluid flow.
More specifically, it relates to impeller blades in air logs for measuring the distance which.
an object traverses relatively to the air.
Such instruments are desirably small and lightly constructed, -with impeller blades which are conveniently sheet steel stampings.
While such instruments can be produced within reasonable tolerance limits, the blades particularly are too fragile to permit manufacture and assembly Within sufliciently close limits to insure duplication of performance characteristics of the assembly, and some means of adjustment for accuracy is necessary.
The object of the invention is a means of adjusting the performance of such a device to a given standard.
A more specific object of the invention is a means of adjusting the pitch of the impeller so that the instrument will conform to the desired standard of response.
The above and other objects of the invention will be apparent as the description proceeds.
According to the invention, screw means are provided for adjusting the pitch of the impeller yblade by bending deflection of its hub portion in a direction longitudinally of its supporting shaft, in a Iplane containing the shaft axis and normal to the center line of the impeller blade.
The drawing shows the application of the invention to an air log for measuring the distance traversed by an airplane relatively to the ambient a1r.
In the drawing:
Figure 1 is a View of the device in part-sectional elevation.
Figure 2 is a View on line 2 2 of Figure 1.
Figure :3 is a view on line 3-3 of Figure l.
Figure 4 is a sectional view on line 4-4 of Figure 1.
Figure 5 is an enlarged View of part of Figure 4 showing the manner in which the pitch off the impeller blade is adjusted by bending deflection of its hub portion.
The impeller blade I has a hub portion 2, secured to a hub l3, on a shaft 4 which has end pivots supported in adjustable jewel bearings 5 and l6 in a housing 1 and a housing 8 respectively, which are connected together by a U- shaped .portion lo whichwin not interfere with turning of the impeller blade.
That portion of the shaft 4 within the housing 1 is provided with a worm I2, engaging a worm Wheel I4, on a cross shaft I5, on which there is a cam I6 which lifts the spring arm Il of a point I8 of a conta-ct breaker away from a stationary point I9 thereof, once for a definite number of revolutions of the shaft 4.
The points I8 and I9 of the contact breaker are arranged to make and break an electrical circuit through an electromagnetic counter (not shown), and since the number of revolutions of the shaft 4 is proportionate to the rate of air flow driving the impeller, the distance traversed relatively to the air by an airplane on which the air log may be mounted will be indicated by the counter reading, provided the instrument is properly calibrated. Calibration can be effected by comparison and adjustment of the device to a known standard in a wind tunnel or in any other suitable way.
As shown, the instrument is provided with only one impeller blade, and its circular hub portion 2 is secured to the hub 3 by two rivets 22 and 23, at spaced points along a line parallel to and removed from the center line of the impeller blade on one side of aplane -b containing the shaft axis and the center line of the impeller blade, as shown most clearly in Figure 2.
The hub 3 is chamfered at 25 and scooped away at 26 to remove weight to balance the rotor assembly about the shaft axis in the manner shown best in Figures 1 and 3.
A screw 28 is in screw threaded engagement with the hub 3 on that side of the plane a-b of Figure 2 opposite tothe rivets 2 Zand 23, and adjustably extends therethrough, parallel to the shaft 4, to bear against the hub portion 2 of the impeller blade.
The screw 28 provides for the required delicate adjustment of the pitch of the impeller blade. As shown in Figure 5, it may be screwed through the hub 3 to bend the hub portion 2 away from the hub 3 and thereby adjust the pitch of the blade.
A spring 30 is provided as a backing for the hub portion of the impeller blade. As shown, the spring 30 is secured to the hub 3 by the rivets 22 and 23 with the hub portion 2 of the impeller blade therebetween. It serves to resiliently oppose bending deflection of the hub portion of the impeller blade, to hold it against the screw 28, and to return it to its original ilat position against the face of the hub 3 upon retraction of the screw 28, in the event that the material of the hub portion of the impeller blade is insuiciently springy to assure this.
I claim:
1. In a device driven by fluid ow, a shaft, an impeller blade with a bendable hub portion extending substantially normal to the axis of said shaft on opposite sides of a plane containing the shaft axis and the center line of the impeller blade, said hub portion of the impeller blade being attached to the shaft only on one side of said plane along a line parallel to and removed from the center line of the impeller blade, and screw means on the other side of said plane for adjusting the pitch of the impeller blade by bending deflection of its hub portion about its line of at'- tachment to the shaft.
2. The combination according to claim 1, in which the hub portion of the impeller blade is secured to a rigid hub on the shaft, the screw adjusting means including a screw in screw threaded engagement with one of said hubs and adjustably extending therethrough, parallel with said shaft, to exert a thrust on the other of said hubs, whereby the bendable hub portion of the impeller blade is bent to effect the required adjustment of the pitch thereof.
3. The combinationV according to claim 1 in which the hub portion of the impeller blade is secured to a rigid hub on the shaft, the screw adjusting means including a screw in screw threaded engagement with said rigid hub and adjustably extending therethrough to exert a thrust on the hub portion of the impeller blade, whereby the latter is bent to eiect the required adjustment of the pitch thereof.
4. The combination according to claim 1 in which bending deflection of the hub portion of the impeller blade by the screw means is opposed by spring means secured to said shaft.
EDWARD V. RIPPINGILLE.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US406015A US2316021A (en) | 1941-08-08 | 1941-08-08 | Air log |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US406015A US2316021A (en) | 1941-08-08 | 1941-08-08 | Air log |
Publications (1)
Publication Number | Publication Date |
---|---|
US2316021A true US2316021A (en) | 1943-04-06 |
Family
ID=23606181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US406015A Expired - Lifetime US2316021A (en) | 1941-08-08 | 1941-08-08 | Air log |
Country Status (1)
Country | Link |
---|---|
US (1) | US2316021A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060120859A1 (en) * | 2002-07-23 | 2006-06-08 | Fabien Cens | Impeller device for data acquisition in a flow |
-
1941
- 1941-08-08 US US406015A patent/US2316021A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060120859A1 (en) * | 2002-07-23 | 2006-06-08 | Fabien Cens | Impeller device for data acquisition in a flow |
US7351034B2 (en) * | 2002-07-23 | 2008-04-01 | Schlumberger Technology Corporation | Impeller device for data acquisition in a flow |
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