US1693352A - Dredger pump - Google Patents

Description

Nov. 27, 1928.

H. F. SCHMIDT DREDGER PUMP Filed Dec. 6, 1922 Maya/livid! INVENTOR WlTNESSES:

ATTORNEY Patented Nov. 27, 1928 UNITED STATES PATENT OFFICE.

HENRY I. SCHMIDT, OF PHILADELPHIA,

PENNSYLVANIA, ASSIGNOB TO WESTING- VANIA.

DBEDGEB PUMP.

Application filed December 6, 1922. Serial No. 605,314.

My invention relates to a pump of the propeller-typeparticularly adapted for use in dredging and in similar operations, and it has for its object to provide apparatus of the character desi ated, which shall be simple, rugged and e cient in construction and operation; which shall be effective to crush or to reduce by attrition large rocks or other foreign bodies attempting to pass therethrough; and in Whichallparts-subject to wear or breakage may be readily replaced.

In the accompanying drawing, Figure 1 is a side view, partially in section and partially in elevation, of a ump constructed in accordance with my lnvention; Figure 2 is a sectional View taken on the plane II-lI of Figure 1; and Figure 3 is a similar view taken on the plane III-III of Figure 1.

In the dredging field and insimilar applications, it has long. been desirable to employ a propeller-type pump on account of its simplicity, compactness and high capacity, to-

plication has been dismissed because of the liability of the propeller to jamming and breakage because of the impact of boulders and other foreign substances thereagainst.

In accordance with the present invention, I provide a propeller pump with a casing having internal teeth adapted to coact with the pump blades in order to crush or to reduce by attrition large boulders attempting to pass through the device and I, furthermore, employ such clearances that the crushed or reduced particles shall not clog subsequent to passing through the propeller.

Referring to the -drawing for a more detailed understanding of my invention, I show an inlet casing at 5,- preferably curved in general contourso as to permit the introduction of a suitable propeller shaft 6 thereinto through a suitable elongated boss 7.

The, casing 5 terminates in a plane flanged opening at 8 and the shaft 6 carries a propeller member 9 arranged to rotate within the member 5 at some distance back from the plane of the opening 8, the blades preferably having a blunt intake edge and a sharp discharge edge as shown at 9'.

The member 5 is suitably recessed back from the opening 8 for the reception of a lining member 10 carrying inwardly projecting teeth 11-11 positioned somewhat back of the propeller 9, this lining member preferably being formed in a plurality of segments 10' for facility in casting.

A divergent discharge member 12 is adapting 8 and carries gulde vanes 13-13 adapted to prevent eddying in the discharge stream as fully discussed in my co-pending application, Serial No. 371,648, filed Apr. 6', 1920, and assigned to the Westinghouse Electric & Manufacturing Company. The vanes 13-13 are carrie between a lining member 14 seated within the member 12 and a centrally-disposed guide cone 15 which further acts to cause smooth, unbroken flow of the discharge stream. Preferably the lining member 14 is formed in a plurality of segments 14', each carrying its blade 13, for facility in manufacture. The cone 15 is provlded with a bearing at 16 to carry the outer end of the shaft 6 so as to more firmly sup port the propeller 9. gether with good efliciency, but such an ap- The member 10 with the teeth 11-11, the member 14 with the vanes 13-13, and the'propeller itself are prefe'rablyformed of material hlghly resistant to wear and breakage, such as chilled manganese, chromium or tungsten steel, and the configuration should be as simple as possible in order. to permit ready casting and chilling. By forming all parts in small portions or segments, manufacture from these refractory alloys is made possible.

The discharge plane of the pro eller 9 is spaced away from the inlet edges 0 the guide vanes 13-13 by a distance X greater than the minimum radialdimension Y of the discharge fluid passage for a reason to be hereinafter more fully pointed out.

ed to be mounted opposite the flanged opena Having thus described the arrangement of a structure constructed in accordance with my invention, the operation thereof is as follows: When supplied with water and mud, the pro eller 9 nctions in' the usual manner, the teet -1111 functioning somewhat as guide vanes to cause proper entry of the fluid to the propeller and/t e guides 13-13, together with the cone 15, facil1tating a smooth, unbroken discharge.

When rocks' and boulders of unreasonable size enter the device they are hit by the propeller blades andt 'rown back against the teeth 11-11 .with .such force that they are either crushed and broken to such an extent that they may pass on through the propeller, or they are, continually thrown around between the blunt inlet propeller edges and the teeth 1111 and rapidly reduced by attrition.

5 By making the dimension X greater than the dimension Y, as indicated, I insure that any fragment which is capable of passing through the propeller 9 shall not become jammed between the propeller and the inlet 1 edges of the vanes 13-18.

Upon the breakage or undue wear of any of the members, the discharge member may be separated from the inlet member at the flanged joint shown, when the propeller 9 may 15 be removed fromthe end of the shaft 6 and the member 10 may be slipped out and replaced. Similarly, the member 14 may be renewed if desired.

While, in general, the clamping of the parts together at the flanged'joint prevents the rotation of the lining members 10 and 14, it will be obvious that they may be keyed in place if so desired in order to positively prevent rotation thereof.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such attempting to pass through the pump.

2. The combination with a propeller pump enclosed in a casing and provided with an 1ntake member, of a ring provided ,with inwardly extending teeth mounted within said intake member, said teeth being adapted to coact with the blades of the propeller to reduce foreign substances attempting to pass through the pump.

3. The combination with a propeller pump enclosed in a casing and provided with an intake member, of a ring formed in a plurality of distinct segments and provided with in wardly extending teeth mounted within said intake member, said teeth being adapted to oo- 55 act with the blades of the propeller to reduce foreign substances attemptmg topass through the pump.

4:. The combination with a propeller pump, of a discharge member therefor provided with guide vanes for preventing eddying, the discharge plane of the propeller being spaced away from the inlet plane of said vanes a distance at least as great as the mini mum radial dimension of the discharge fluid passage.

5. In a propeller pump structure, the combination with an inlet member, of a propeller mounted near the discharge opening thereof, a discharge member coacting with said inlet member to provide a pump casing, internal 'teeth in said inlet member positioned so as to coact with the pro peller blades to reduce foreign bodies attempting to pass through the pump, and guide vanes within said'outlet member adapted to prevent eddying in the discharge stream, the inlet plane of said guide vanes being spaced away from the discharge plane of said propeller a distance at least as great as the minimum radial dimension of the discharge fluid passage.

6. In a propeller pump structure, the combination with an inlet member, of a propeller mounted near the discharge opening thereof, a discharge member coacting'with said inlet member to provide a pump casing, internal teeth'in said inlet member positioned so as to coact with the propeller blades to reduce. foreign bodies attempting to pass through the pump, and guide vanes within said outlet member adapted to prevent eddying in the discharge stream, the inlet plane of said guide vanes being spaced away from the dischargeplane of said propeller a distance at least as great as the minimum radial dimension of the discharge fluid passage, and said internal teeth and said guide vanes being carried by removable lining members, whereby they may be readily renewed upon wear or breakage.

7. In a propeller pump structure, the combination with an inlet member, of a propeller mounted near the discharge opening thereof, a discharge member coacting with said inlet member to provide a pump casing, internal teeth in said inlet member positioned so as to coact with the propeller blades to reduce foreign bodies attempting to pass through the pum and guide vanes within said out let mem er adapted to prevent eddying in the discharge stream, the inlet plane of said guide vanes being spaced away from the discharge plane of said propeller a distance at least as great as the minimum radial dimen-- sion of the discharge fluid passage, and said internal teeth and said guide vanes being carried by removable lining members formed in separable segments, whereby they may be readily renewed upon wear or breakage.

' 8. In a'propeller pump structure, the combination with a curved hollow inlet member terminating in a plane opening, of a hollow boss projecting thereinto and surroundin a drive shaft carrying a propeller arranger T to rotate in a plane paralle and adjacent to said discharge plane, a lining member within said inlet member and carrying a plurality of inwardly projecting teeth adapted to coact with the propeller blades in the reduction of foreign bodies attempting to traverse the pump, and a divergent discharge member adapted to coact with said inlet member to provide a pump casing, said discharge member being provided with a plurality of internal guide vanes carried by a removable lining member.

9. In a propeller pum structure, the combination with a curved ollow inlet. member terminating in a plane opening, of a hollow boss projecting thereinto and surrounding a drive shaft carrying a propeller arranged to rotate in a plane parallel and adjacent to said discharge plane, alining member within said inlet member and carrying a plurality of inwardly projecting teeth adapted to coact with the propeller lades in the reduction of foreign bodies attempting to traverse the pump, a divergent discharge member adapted to coact with said inlet member to provide a pump casing, said discharge member being provided with a plurality of internal guide vanes carried by a removable lining member, the intake lane of said guide vanes being spaced away ii'om the diggiarge plane of said propeller a distance at east as great as the minimum radial dimension of the discharge fluid passage.

10. The combination with a rotary pump, of means within the casing and adjacent the inlet of the pump for reducing foreign substances by attrition.

11. The combination with a rotary pump, of abrasive means within the casing and adjacent the inlet of the pump for reducing foreign substances .by attrition.

12. The combination with a rotary pump, of means providing an abrasive surface extending around the interior of the casing and adjacent the inlet of the pump for reducing foreign substances by attrition.

In testimony whereof, I have hereunto subscribed my name this 28th day of November, 1922.

HENRY F. SCHMIDT.

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