Патент USA US2403897код для вставки
jy Hy 3%’ w. F. ALLEN" D ‘ 2A®3$897 LEAKAGE GAUGING DEVICE Filed June 13, 1945 II T - INVENTOR ATTORNEY f/4 Patented July 16, 1946 2,403,897 * UNITED‘ STATES PATENT ‘OFFICE I LEAKAGE GAUGING DEVICE ‘ Willis Fay Aller, Dayton, Ohio, assignor to The Sheffield Corporation, Dayton, Ohio, a corpora ' ~ tion ,of-Ohio ' Application June 13, 1945, Serial No. 599,202 3 Claims. (Cl. 73-40) 1 This invention relates‘ to gauging devices, and more particularly to gauging devices for measur ing a small leakage ?ow of air or other ?uid at a part being checked. ' ' '- ' 2 of leakage that takes place between the ?tting surfaces. Such a workpiece has been illustrated in the ?gure, as indicated at H). As shown, the ' workpiece I0 has a lower surface H intended to inter?t with the upper surface [2 of a piece 13 a gauging device having a ?ow measuring mem that may form a part of the workpiece or form ber that measures the rate of ?uid,?ow from a an attachment used in conjunction with the supply source, the measuring member having a work connection member l4. connection to a leakage ori?ce that provides suf UThe work connection member I4 preferably ?cient leakage of the ?uidto' give a desired 'indi 10 has an inserted rubber pad l5, so that the at cation‘ or reading on the measuring member,-_ the tachment l3 can merely-rest on this pad with no outlet‘ of the measuring member being also con leakage ?ow of ?uid taking place between the nected to a work connection member so that the lower side of the attachment l3 and the pad. rate of - leakage at the part will be shown by The joint between the upper surface l2 of the One object of the invention is the provision of the indication on the indicating member. 15 attachment l3 and the lower side of the work Another object is the provision of a gauging piece IO, if there is a perfect inter?t, will not device for measuring ?uid leakage and embody afford any leakage ?ow through this joint. How ing atube of tapering cross-sectional area with a ever, if the surfaces do not inter?t perfectly and ?oatloperable ‘alonglthe tube in accordance with there is a small leakage ?ow when air or other the rate of ?ow of ?uid through the tube, the 20 suitable ?uid under pressure is supplied to the outlet of the tube having a connection to a leak space l6 at the workpiece, the ?uid supplied to age ori?ce and a connection to a work. connec tion'member which is adapted for connection to a workpiece for checking leakage at the work piece... » > v ‘ ' ‘ .Another object ‘is the provision of a gauge of the character mentioned, in'which the leakage that space will leak out through the crevices. In accordance with this invention, the presence of such a leakage and the rate of leakage ?ow 25 is readily determined .even though the amount of flow is exceedingly small. The work connection member [4 has a cham ori?ce that provides an indication of the rate of ber I‘! that supplies ?uid to the workpiece. A flow measuring device is readily adjustable so pipe I 8 connects the work connection member to thatithe indication'given, when there is no leak 30 a valve l9 having an outlet ori?ce 20 leading to' age ?ow. through the part itself, is at a suitable the atmosphere and having a valve member 2i, point in the range of operation of'the measuring such as an adjustable needle which can be turned by the thumb screw 22 to close the leakage ori Other objects and advantages of the invention ?ce entirely or to open the leakage ori?ce to any will be apparent from the following description, desired extent. The valve I9 is supplied with .35 the appended claims, and the accompanying air under pressure by a ?exible tube 23 leading from the upper end of a vertical transparent In the drawing the ?gure shows a measuring or tube 24 of substantial length, and of gradually gauging device embodying the present invention. increasing cross-sectional area in the inside of Referring more particularly to the drawing, in 40 this tube, which has its smaller end at the bot which the variousfpgr'ts' are identi?ed by refer tom'and its larger end at the top, as shown.‘ The ence numerals, the invention is herein illustrated lower end of this tube is connected to a supply as a gauging device for measuring the leakage at pipe 25 which leads from a pressure regulating or through a workpiece. The workpiece itself valve 26 having an adjustable pressure regulat may take many forms. It may be a pump, for 45 ing handle 21. Air under pressure is supplied to example, where it is desired to ?nd how much the Valve through a supply connection 28 which leakage takes place past the pump impeller, and extends to the factory air supply line or to any in such case the pump inlet or outlet is placed other suitable source of air pressure. in. communication with a chamber 0n the work Within the tube 24 is a light measuring mem connection member. It may be a part to be sized 50 ber or float 30, the diameter of which is very under low air pressure by a gauging nozzle on a slightly less than the inside diameter of the lower work engaging member. The workpiece to be end of the tube 24. When a ?ow of air takes checked may have a ?at surface or an irregular place through the tube, the ?oat is raised by the surface placed on or inter?tting with another air flow until the space between the ?oat and surface, Where it is desired to check the amount 55 the walls of the tube is sufficient to hold the ?oat device“ drawing. »- _ .- , i - - _ . ' . ‘ , ' i 2,403,897 4 3 constitutes a preferred embodiment of the inven stationary in an elevated position—for example, in the position shown in the ?gure. As the clear ance between the ?oat and the tube is small, and tion, it islto be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without the weight of the ?oat is small, a very small departing from the scope of the invention which is de?ned in the appended claims. amount of air flow is sufficient to elevate the ?oat in the tube. ' What is claimed is: In measuring the rate of leakage through a part or along a wall of a part to be checked, be 1. A gauging device for measuring ?uid leak- ‘ age Comprising a tube of tapering cross sec fore the part is placed on the work connection member, air is supplied to the measuring tube 10 tional area, means supporting said tube in sub at a few pounds or a few ounces per square inch . stantially vertical position with the end of smaller area at the bottom, a pressure control pressure depending upon the particular require means for supplying ?uid under pressure to the ments of the part to be checked, and maintained lower-end of the tube, a gravity actuated ?oat at a constant value by the operation 'of‘the pres operable along the tube by a ?ow of ?uid through sure regulating valve. The outlet of the cham the tube, means providing a leakage ori?ce in ber I1 is blocked off, as by covering that outlet communication with the upper end of the tube with a ?at workpiece or by holding the outlet to provide a continuous leakage ?ow such as to hole closed by hand, and needle valve 2| is ad cause elevation of the ?oat, and a work con ori?ce 20 to the atmosphere to cause the ?oat 20 nection member having ‘a chamber communicat ing with the upper end of the tube and adapted 30 to move up to some suitable position between for communication with a workpiece for testing the upper and lower ends of the tube 24. Its justed to provide su?icient leakage through the leakage ?ow at the workpiece. position along the tube is noted by observing the 2. A gauging device for measuring ?uid leak readings of the scale 3! alongside the tube. The workpiece is then placed in position on the work 25 age comprising a tube of tapering cross sectional area, means supporting said tube in substan connection member and the position of the ?oat tially vertical, position with the end of smaller 30 with respect to the scale 31 is then noted. If area at the bottom, a pressure control means for its position is the same as it was at the start supplying ?uid under constant pressure to the of the operation, it will be clear that no leakage at all has taken place through or along the 30 lower end of the tube, a gravity actuated ?oat operable along the tube, means-providing a con part being checked. If the ?oat has moved up trollable leakage ori?ce in communication with wardly to some new position, it shows the the upper end of the tube and having a readily amount of leakage that takes place past the part. adjustable means to vary the leakage through The scale can be calibrated so that the readings directly give the amount of leakage taking place 35 such ori?ce, means for adjusting the pressure of the ?uid supplied to said tube, and a work con through the part. In comparing a part to a nection memberhaving a chamber in free com master having a permissible amount of leakage, munication with the upper end of said tube and the master is ?rst placed in position on the work adapted for connection to a workpiece for check connection member after having ?rst adjusted the needle valve so that the ?ow through the 40 ing leakage at the workpiece. 3. A gauging device for measuring the rate ori?ce 2|] alone raises the ?oat to some suitable of leakage of a part to be gauged comprising a indicating position. With the master in place, tube of tapered cross sectional area, means sup the reading on the scale 3| is noted. The master is then removed and the work pieces to'be checked are then successively applied to the work con porting said tube in substantially vertical posi 45 tion with the end of smaller area at the bottom, an adjustable pressure regulating valve for sup plying air under pressure to the lower end of the nection member, and after each piece is placed in position, the height of the ?oat is noted to tube, a gravity actuated ?oat operable along the tube, a leakage valve in communication with permissible limits. It will be apparent that if the leakage ori?ce 60 the upper end of the tube and having an adjust see if it falls even with, or below, the maximum able valve member and a valve ori?ce leading to the atmosphere, a connection from the discharge side of said valve, and a work connection mem 20 were not employed, there could be a very substantial amount ‘of leakage taking place through or past the part on the Work connec tion member without moving the ?oat from its her‘ in communication with said connectiomsaid lower normal position in the tube. In accord 55 member having a yielding pad in which the workpiece can be applied and having a pressure ance with the present invention, however, this chamber adapted for communication with the objection is entirely overcome and an accurate workpiece whereby the leakage along the work and reliable reading is obtained even though the piece will be indicated'by said ?oat. leakage flow through the ‘part is exceedingly small. > ' While the form of apparatus herein described 60 WILLIS FAY ALLER.