US1993918A - Hydraulic power transmitter - Google Patents

Description

March 12, 1935. D. CAMPBELL HYDRAULIC POWER TRANSMITTER Filed April 6, 1935 Patented Mar. 12, 1935 PATENT OFFICE HYDRAULIC POWER TRANSMITTER, Duncan Campbell, Glasgow, Scotland Application April 6, 1933, Serial No. 664,839

In Great Britain September 16, 1932 2 (Cl. 6H4) My invention relates to an improved hydraulic power transmitter, and has for its object, inter alia, to simplify the construction and increase the efliciency of such, all as hereinafter described with reference to the drawing and pointed out in the claims.

In order that my invention may be properly understood and readily carried into effect, I have hereunto appended one sheet of drawings, of which Figure 1 is a sectional elevation illustrating my invention,

Figure 2 is an end view of Figure 1.

Figure 3 is a detail view of the variable guide vanes in section, and shows the same in dotted lines when moved to contact with the flxed guide vanes or spacing plates.

According to this invention and referring to the drawing, the transmitter is constructed in such a manner that the casing A is split into two sections and suitably connected or jointed on a plane which passes through the axis of the shafts B and C. -The driving shaft B is carried on ball-bearings D, which are situated at the outer end in a suitable recess E in the casing A, and at the other end in a suitable recess F in the hub G of the driven member H. The hub G of the driven member H is carried on a ballbearing or bearings I situated or placed in a suitable recess J in the casing A. Stufling boxes K are formed in the casing A at the outer ends of both shafts B and C, and suitable glands L and packings M are also provided.

The central boss N of the impeller is suitably keyed to the driving shaft B by means of the key 0, but in such a manner that the impeller is capable of sliding longitudinally to oppose either the forward turbine blades P or the reverse turbine blades Q, as required. The impeller blades R are' cast integrally with the impeller casting, or the impeller may be in two parts or sections, the impeller blades B being cast integrally with one part or section and suitably attached to the other part or section; or the impeller blades B may be separate and suitably attached to the impeller parts, and they extend from the eye or inlet chamber S of the impeller to its periphery. A collar T with which the impeller operating fork U engages is carried on a ball bearing V at the end of the impeller boss N. The forward turbine blades P may be cast integrally with the driven disc H, or they may be separate'and suitably attached thereto. The reverse turbine blades Q may be cast integrally with their respective blade-ring X, or

blade ring X. A serrated bush B which is carried by the casing A, and embraces the impeller boss N is provided in order to relieve gland pressure and leakage at the end of the driving shaft B. Return guide vanes or plates C are provided on the fluid return passage for directing the working fluid at the correct angle to the impeller inlet chamber 8. These vanes C may be cast integrally with either the internal guide A or serrated bush B referred to, or with both, or

they'may be separate andsuitably attached tosame. Variable guide vanes are provided to meet the fluid discharged from the' turbineblades P or Q at varying angles, and direct same to the return guide vanes C with minimum shock, these variable guide vanes being situated in the fluid return passage adiacent to the outer diameter of the internal guide A Each variable guide vane is in two parts or sections D and E and are hinged together in such a manner as to allow suitable or restricted angular movement between them relative to one another to the position shown by the dotted lines in Figure 3. Each section D of the variable guide vanes is pivoted near its leading or outer edge on a pin or fulcrum I, which is attached to the internal guide A The free end of the other section E is disposed intermediate the fixed guide vanes or plates 0', whereby the angular movement of said members D and E on the fulcrum pin F is restricted'by the flxed guidevaries C to the positions shown. The position in Figure 3 illustrates the normal position assumed by the. hinged or variable guide vanes D and E at maximum speed ratio when the fluid discharge from the turbine member is radial. Obviously under such condition and likewise slight fluctuation on either side of this condition the variable guide vanes are idling; however, that the fluid 'would ordinarily suffer appreciable shock loss at entry to the Med guide vanes C, the variable guide vanes D and E assume either of the positions (as required by the speed ratio) shown in dotted lines, and deflect with minimum shock the fluid in a path indicated by arrows 2 and 3 respectively.

46 of the variable guide vanes shown in full lines Two elbow pipe connections G are provided through the casing A at suitable points in the fluid passage, one facing the direction of flow, and the other in the opposite direction. By this means a quantity of the working fluid is by-passed from the transmitted for purposes of cooling and such like. The fluid is also led back into the transmitter after being cooled.

I claim:

1. In a hydraulic power transmitter having a driving and a driven shaft coaxially supported to rotate within a casing provided with spaced inner and outer walls, radially projecting plates to hold said walls spaced apart and to form a passageway, a turbine unit provided with blades flxed to said driven shaft and to rotate within said passageway, an impeller mounted upon the driving shaft to register with the turbine unit, and a plurality of hinged guide vanes in the passageway between the turbine blades and the spacing plates, each of said vanes formed in two sections and connected together to permit angular movement relative to one another, the outer end of one section pivotally mounted in the passageway adjacent the blades, the free end of the other section disposed between apair of platea whereb'y the fluid discharged from the blades causes movement of the vanes into varying angles to direct the flow of the fluid through the passageway with minimum shock and without loss of potential energy.

2. A hydraulic power transmitter comprising a driving and a driven shaft,a casing to provide a closed chamber and arranged to support said shafts co-axially, an internal guide within said casing, radially projecting plates secured to one side of said casing and guide to space the same apart, and provide a fluid return passageway, a disc fixedly connected to the driven shaft and housed to rotate adjacent the opposite side of the casing, forward and reverse blades carried by said disc with their outer ends arranged to register with said passageway, a ring fixed to said internal guide and having blades to aline with said reverse blades, an impeller mounted upon the driving shaft to rotate therewith, and

,slidable thereon to register'with either the forward or the fixed blades, the said impeller having sliding connection with the internal guide to form an inlet passageway for the flow of fluid in close proximity to the lower portions of the plates, and a plurality of hinged vanes each pivotally connected near one end thereof in the passageway adjacent to the outer ends of the turbine blades to receive the flow of fluid therefrom, the opposite or free end of each of said vanes disposed between a pair of spacing plates, whereby the fluid discharged from the blades causes movementof the vanes into an angular position and into contact with the plates to direct the flow of said fluid. through the passageway with minimum shock and without loss of potential energy.

' DUNCAN CAMPBELL.

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