US 2107260 A
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Feb. I; 1938; s. IHARA 2,107,260
CORROSION RESIS'LTNG PUMP AND BLOWER Filed Birch 4, 1936 -2 Sheets-Sheet 1 INVENTO/j.
Feb. 1; 1938 1 S.YIHARA 2,107,260
CORRQSION RESISTING PUMP AND BLOWER Filed Mai- 11 4,1936 2 Shets-Sheet 2 INVENTOR.
Patented Feb. 1, 1938 UNITED STATES PATENT cr me CORROSION igfi rs'rmc Ping AND WEB Seytiro Ihara, Nakaku, Nagoya, Japan, assignol go Nippon Gaishi Kabushiki Kaisha, Nagoya,
Application March 4, 1936, Serial No. 67,126
. 3 Claims. (Cl. 103-114) are united together with the porcelain shell I and end covers 2 and 4 respectively by means of cementing material 5 as a unit and the metallic parts are connected together by means. of bolts to construct apump casing. In cementing the porcelain parts to the metallic shell or casing the surface of the porcelain to be cemented is My invention relates to improvements in the construction of corrosion resisting pumps and blowers such as those operating with acids or corrosive liquids, and more particularly to the construction of casing and shaft sealing means.
Porcelain or stone wares have heretofore been adopted for the main parts ofcorrosion resisting pumps or blowers proper. Since such material is mechanically weak it is strengthened by a metallic shell. But the combination of metallic and porcelain parts should be very carefully considered, especially the porcelain member constituting a cylindrical casing and having the delivery canal which is often liable to crack at the bent covers owing to the bending stress caused therein. On the other hand the packing is liable to be worn gradually and to cause leakage of corrosive liquid or fluid, thereby deterl- I orating the working parts to increase the leakage more and more. The leakage prevention is one of the great'troubles in operating such corrosion resisting pumps. for packing around a shaft is easily attacked by acid and becomes loose to invite leakage.
One object of my inventionis to protect the corrosion resisting porcelain lining against the bending stress which is the 'worst cause for cracking the porcelain cylinder as found by the reference is taken to the accompanying drawings in whichFig. 1 is a sectional elevation of acid-resisting pump embodying my invention, Fig. 2 is apartial sectional view for illustrating a special construction of water seal for the packing as an embodiment of this invention, Fig. 3 is a partial view of the porcelain cylinder showing the sanded surface, and Fig. 4 is a par-v tial sectional view showing the cooling means of shaft packing.
Referring to the drawings, I represents a pump casing; 2 is an end cover having an inlet port opening 3, and 4 is the Opposite end cover, all of these parts being made of porcelain and the like acid resisting material. ,I' represents a me-' tallic shell of the pump casing; 2' and 4' are end covers made of 'metal such as cast iron. The
metallic shell I and metallic covers 2' and 4' Heretofore usual means roughened. by so-called sanding process, that is, the sanded surface asshown at l. Such sanding process is effected by attaching small pieces of porcelain tov the desired surface with glaze and fusing together by baking so as to produce sanded surface as shown mbre clearly in Fig. 3. Such sanded surface provides a very good and effective adhesion surface for the cementing material and it may be applied to any desired outer surface of the porcelain lining. The cylindrical surface at 1 of the casing body i and also the cylindrical or round portion I of the end covers 2 and 4 are the most important parts to' which the sanding is to be applied, but it may be applied to the flat surface of the end cover as shown at "I'. Thus according to my invention a pump casing is made of metallic outer shell and metallic end covers entirely lined with corrosion resisting material such as porcelain.
The impeller 9. is made of corrosion resisting material such as porcelain-having the cylindrical boss l0, extending through the end cover 4, A metallic shaft ll isinserted into the boss and secured thereto by means of cementingmaterial l2 and the remaining space inside of packingis filled with metallic powder l3 and tightly sealed.
by means of nut H in order to increase the thermal conductivity. In some cases as shown in Fig. 4 the vacant space 33 is left around the shaft without filling metallic powder l3 and cooling water is injected into the space 33 from the nozzle 34. A casing 35-provides"a protective hood for water in the construction shown in Fig. 4. Referring again to Fig. 1,. l5 represents packing material; I6 is a packing gland made of porcelain and i1 is its clamping flange. Thus the metallic shaft Ii is entirely covered bythe porcelain bo'ss l0 and separated from the interior' of the pump and does not make direct contact with acid or other corrosive liquids.
Spaced studs I 8 are secured to the end cover,
each carrying a cylinder l9 enclosing a spiral spring 20.which is' held in compression by the top of the stud I 8. A clamping stud 2| is screwed into the top end of the cylinder l9 and acts on the flange I! by means of the nut 22. By such arrangement the packing gland i6 is always pressed on the packing by the spring 20 acting 2 onthestud tl sothatthe paoking "is always tishtened tocompensatethe wear oi packing during the Byarranging the spring device as described, above in the space between the-end cover landthe flange ll the vacant space is utililedwithout extending the stud 2tand without increasing the space between the flange I1 and the opposite bearing.'
In Elan 2 I'have shown an automatic device for regulating the supply ofcleanwater to the pack- 'ing around the pump shaft to overcome the leakage or corrosive liquid as an embodiment of this passage 2t is-made in the porcelairi'iining 4 of the end cover. The space '23 is covered by means of acid resisting elastic diaphragm 25 to which rissecuredapistonvalvellbymeansotarodll.
The piston valve 28 is operated by a spring it normally to close the port I! through which clear water issuppliedto'thespacebehind the dia phragm 25 and then the water is supplied to the packing through the passage ll so that the water pressure may be'applied to the space around the inventionrlteierringltol lgritapressureflun:"- ,ber 23' leading to the inside of pump through a shaft-to overcome the leaking pressure of corrosive liquid. The pressure water is supplied 1 (mm a pipe ll-throi'uh a glass gauge 32 facilitasting the inspection of positive supply of pres- In accordance with the above described conopening and having a protecting metal cover secured thereto by cementing material," an opposite I end cover and hub made of porcelain and firmly secured to a protecting metallic cover by cementing material, the outer cylindrical surfaces of saidporcelain body and'end covers being roughened by a sanding process and cemented to said metallic shell and covers which are assembled and connected to form a pump casing, clamping means IOILSQCllIlllg 1QHLQYIS with the porcelain sides against the ends of said laterally projecting body portions to maintain an acid of porcelain and having a hollow iboss extended through the hub of an end cover, a driving shaft inserted into said hollow boss and fixed thereto by cementing material, and packing means tightproof fluid tight joint, an impeller entirely made ly sealing said boss and hub against leakage of corrosive fiuids.-
2. A corrosion resisting pump casing comprising an annular porcelain bodyhaving laterally extending end, portions'and defining a delivery .canal and firmly'secured to an enclosing metallic shell by cementing material, an end cover andhub made of porcelain having an inlet openr secured;
ing and having a protecting metal covb thereto by cementing material, an opposite end cover and hub made of porcelain and firmly sestruction ofthe acid resisting pump embodying this invention the porcelain linings are very firmly secured to the metallic shell'and endcovers owing tothe sanded surface which is integral with the porcelain bodyso that when the casing cured to a protecting, metallic. cover by cementing material, the entireouter surfaces of said porcelain body and end covers being cemented to' said metallic shell and protecting covers, clamping means for securing said end covers with the porcelain sidesagainst the ends of said laterally is tishtlyrastened together by bolts the men axial force can be carried by the sanded portion 1 ,andwthe metallic cover and no bending stress 'is set up therein, butallstresses due to the internal pressure of pump casing can bounded by the'metallic outer shell. ,The troubles at the packing owing toleakage oicorrosive fluid can be avoided by the above construction since the packing is always and clear. wa-
ter acts automatically to overcome the internal pressure. the'pump'embodv'ing this invention is'ven strong, durable and compact.
What I claim as new and desire tosecure by Letters Patent '0! the United States is! 1. A corrosion resisting pump construction oomprisingan annular porcelain body having -laterallyproiecting end portions and defining a delivery eanaland firmly secured to an enclosing metallic shell by cementing material, anend coverandhub made of porcelain having aninlet' 3. In a corrosion resisting pump construction having a separable annular metallichousing and an annular hollow porcelain chamber section provided with cylindrical end flanges adapted to be received in said metallic housing, means conl sisting of small pieces of porcelain fused to the exterior walls of said chamber section for rough-' ening them, and cementing means between said chamber section and metallic casing engaging with said roughening means whereby axial strain on said section is borne by said casing to prevent cracking 01' said hollow section.