Патент USA US2404678код для вставки
July 23; 1946. C. E.-WUENSCH IMPELLER Filed‘ June ‘5, 1944 ‘2. Sheets-“Shae? 1 INVENTOR. . CHARLES Ema WUENSCH BY 4777’. July 23, 1946. 2,404,678 C. E. WUENSCH IMPELLER Filed June 5, 1944 2 Sheets-Sheet 2 1/,a. ‘ \ ! I)II 1111111 ll/IIIIIIIIII INVENTOR. CHARLES BY ERG - WUEHSCH é ' _ r ‘477-7’. Patented July 23; 1946 2,404,678 UNITED STATES PATENT ‘ OFFICE f 2,404,67 8 . INII’ELLER ‘ V ‘ Charles Erb Wuensch, Saratoga, Calif. ‘ Application“ June 5, 1944, Serial No. 538,794 ‘ .7 Claims. 1 This invention relates to‘ impellers, and more particularly to ?exible resilient blades for the im pellers of centrifugal pumps. -‘ Among the objects of the invention is the pre (01. 103-115) 1 . ‘2 . composed of sides X—l and X-Z and acylindri cal bowl .X-—3. It is to be understood that the impeller and particularly the blades of the pres ent invention are useful especially in apparatus . vention of injury to the blades of the impeller Cl where ?uids‘ with abrasive materials‘in suspen by oversize objects in the flow passing through sion are circulated or agitated. While: it is‘ pre the pump which would otherwise damage the ferred to attach and dispose the blades 2 radially pump and stop the operation. from the hub 8, it is to be understood that they Another object is to provide a blade that will may extend tangentially from the hub if desired ?ex to permitan‘obstruction to pass and then as shown in Figures 6 and 7. be restored to normal operative shape by th One construction or the blades 2 ‘may be de centrifugal force of the operation. ' A further object is to prevent excessive wear scribed ‘as comprising. a series of spaced metal wires or- cables‘ 1. arranged in a‘ common plane of the blades in pumping abrasive materials. extending in spaced relation substantially across Further objects are to provide a construction 15 the entireiwidth of the blade 2‘.- The inner ends of maximum simplicity, economy and ease of as of the wires I are bent around an anchor key 3 sembly and contemplates such other and further and maybe bent back upon themselves as at 4, advantages as will appear to one skilled in the to reinforce the lowerportion of the blade 2. art as the description thereof proceeds. In the event greater strength is desired. for the Inv attaining the foregoing objects, together with 20 core, the wires or cables can be continued so that such further bene?ts, advantages and capabilities the ends of each wire I terminates at the point as may hereinafter appear and as inherently pos of beginning. It is preferable, however, to give sessed thereby, there is disclosed byway of il thereturning end a lateral twist so that all of lustration only, the constructions shown in the the wires I lie in the same plane and do not dou accompanying drawings. It is to be understood, 25 ble ‘back on each other ‘as shown in Figure 1.- The however, that the invention is not limited to outer ends of the wires may have eyelets 5" formed the examples shown because the same may be thereon or may be ?attened or left as they are. embodied in further modi?cations within the The purpose of ?attening the wires l or forming spirit of the invention as set forth in the claim eyelets as ‘shown in Figure ‘2 is to assist‘ in an followingthe description. ‘ 30 choring a weight 5. The weight 5 may be lead Referring to the drawings: ' c. Figure 11s a side elevation of a centrifugal pump with a portion of the casing broken away to disclose an impeller having blades constructed in accordance with this invention. ' ' Figure 2 is an enlarged longitudinal section of a. single blade of an impeller. ‘ " j Figure 3 is an enlarged front elevational view of a single blade. ‘ - Figure 4 is an enlarged longitudinal section of a single blade representing a modi?cation. Figure 5 is a fragmentary front elevation of a blade with a portion of the hub in section show ing a detail of the attachment. Figure 6 is an enlarged view of an impeller blade showing tangential mounting and also il1us_ or any other suitable Weight which can be cast or otherwise maintained around the outer ends of the wires or cables I. The advantage of cast ing the weight 5 around the outer ends of the wires l is to secure the assembly in a perma nent arrangement which will then form a rein forcing core for the blade 2. The purpose of weighting the outer ends of the blades is to give rigidity at this point and also to stretch the blades slightly so as to minimize any tendency through centrifugal action to become larger in cross sec tional diameter or area at the point of maximum flexure. _. ' _ The external body of the blade 2 which forms it into a structure having a rectangular horizon tal section is composed of rubber or other highly trating the positions assumed during operation resistant and resilient compound ‘I which ‘can and at rest. be vulcanized or otherwise formed around and enclose the core and weight 5 to make the com-r ‘ ‘ Figure 7 is an enlarged view of a variant form of blade. ‘ ‘ Referring now more particularly to the draw‘ ings, the impeller of the present invention com» prises a series of radially extending blades 2 which are securely mounted in or upon a hub 8 rotat 50 plete blade 2. > It will be observed that the weight portion 5 imparts a bulbous‘ or streamlined shape to the outer end of the impeller as shown in Figure 2 and presents a curved impact surface in rest po lng Within a housing or casing which is generally 55 sition. The shape of the weighted portion in the 2,404,678 5 6 substances and eliminates corrosion when the im peller is idle. a ?exible internally reinforced resilient covering pumps comprising in combination a ?exible core pass an obstacle and return to its normal state without stopping the operation of a pump. 6. A ?exible impeller blade for centrifugal pumps comprising in combination a sac of resil ient ?exible material adapted to be sealed at its inner end adjacent the hub to form a closed cav ity therein, and a free moving weight in said cav for the blade said structure being capable of mo In operation the bulblike end of the blade 2 mentary distortion and ?exing to pass an ob presents an impact surface substantially similar stacle and return to its normal state without to that shown in the position I of Figure 1 and stopping the operation of a pump. V of Figure 6. However, if the blade is made 4. An impeller for centrifugal pumps com inclined slightly forward as shown in the broken prising in combination a hub, and a plurality of line IV of Figure 4 it will straighten out under blades ?exible substantially from hub to tip, each the load of pumping and as a result of centrif weighted at the outer end to form an enlarged ugal force. Accordingly it will present an im 10 bulb-like end and each armoured with a resilient pact surface corresponding substantially to the ?exible coating said structure being capable of rest position shown in full lines in Figure 1. An momentary distortion and ?exing to pass an ob advantage from inclining the position of rest stacle and return to its normal state without stop slightly forward resides in the fact that there ping the operation of a pump. ‘ will be less slip stream loss in the operation. 5. An impeller for centrifugal pumps com 15 In order to completely armour the impeller it prising in combination a hub, a coating of resil will‘ be desirable to armour the exposed surfaces ient armour on said hub, and a plurality of blades of the hub as shown at ‘Ia. This will protect all flexible substantially from hub to tip adapted to of the exposed surfaces with a resilient armoured be held by said hub and extended outward there coating and likewise prevent rusting during non 20 from, each weighted at the outer end to form an operating periods. enlarged bulb-like end and each armoured with I claim: a resilient ?exible coating said structure being 1. A flexible impeller blade for centrifugal capable‘ of momentary distortion and ?exing to extending substantially its entire length, a Weight secured to the outer end of said core to form an enlaregd bulb-like end, means at the other end of said core for securing the blade to a hub, and a ?exible resilient covering for said core and said weight said structure being capable of mo mentary distortion and ?exing to pass an ob stacle and return to its normal state without stopping the operation of a pump. nally therein in response to external forces such as pressure, centrifugal force and distortion said 2. A ?exible impeller blade for centrifugal structure being capable of momentary distortion ity adapted to and capable of moving longitudi pumps comprising in combination a ?exible core 35 and ?exing to pass an obstacle and return to its extending substantially its entire length, a weight normal state without stopping the operation of secured to the outer end of said core to form a Pump. an enlarged bulb-like end, means at the other 7. A ?exible impeller blade for centrifugal end of said core for securing the blade to a hub, pumps comprising in combination a sac of resil and a ?exible resilient covering for the entire 40 ient ?exible internally reinforced material adapt blade said structure being capable of momentary distortion and ?exing to pass an obstacle and return to its normal state without stopping the operation of a pump. 3. A ?exible impeller blade for centrifugal ed to be sealed at its inner end adjacent the hub to form a closed cavity therein, and a weight in said cavity adapted to and capable of moving lon gitudinally therein in response to external forces such as pressure, centrifugal force and distor pumps comprising in combination a ?exible core tion said structure being capable of momentary extending substantially its entire length, a weight secured to the outer end of said core to form an distortion and ?exing to pass an obstacle and re turn to its normal state without stopping the op enlarged bulb-like end, means at the other end eration of a pump. of said core for securing the blade to a hub, and ‘ CHARLES ERB WUE'NSCH.