US2991722A - Turbine pump unit - Google Patents

Description

Juiy 11, 1961 w. K. JEKAT 3 :Sheens-Sheet 1 Filed Nov. 27, 1959 FIG-.1

WA U'ER K. JEK

July 11, 1961 w. K. JEKAT 2,991,722

TURBINE PUMP UNIT Filed Nov. 27, 1959 5 Sheets-Sheet 2 28 29 lo 2 &

\9 38 T mr WALTER K TEKAT INVENTOR.

July 11, 1961 w. K. JEKAT TURBINE PUMP UNIT Filed Nov. 27, 1959 3 Sheets-Sheet 3 WALTER K. IEKAT INVENTOR.

State Ute This invention relates to turbine-pump units and more particularly provides an embodiment wherein the rotating and sealing portions are readily accessible for inspection, and replacement should same be necessary.

It is desirable that pipes leading to turbine-pump units need not be loosened when inspection or repair of the rotating and sealing portions is necessary.

While erection as above discussed has the advantage in maintaining fluid tight sealing at the connecting junctions there are disadvantages in that disassembly becomes a burden and the cost of providing a unit to permit permanent connection to the inlet and outlet pipes and yet provide access to the rotating portions, is excessive. By way of example, turbine-pump casings are split horizontally, one portion being permanently fixed to the inlet and outlet pipes, the other removably connected to the former to provide for access to the rotating and sealing portions. A unit such as above described has the disadvantages in that the weight and work of manufacturing are augmented because of the flanges which extend around the machine. Furthermore, the operating effectiveness of the unit is affected because of the large and complicated faces between the flanges. These faces require careful attention if they are to provide a fluid tight seal.

Furthermore, these prior type turbine-pump units are usually formed in independent casings wherein the rotating portions are mounted on the same shaft. Complex sealing means, further adding to the cost of manufacture, are provided between the pump and turbine as is shown in Patent 2,495,525.

The above enumerated disadvantages would certainly be avoided by disposing both the impeller and rotor in a common casing which is divided circumferentially instead of horizontally. Circumferentially dividing either the pump casing or turbine casing has been tried in the past (none of those prior art systems teaching inclusion of the impeller and rotor in a common casing as contemplated herein) and this had the disadvantage that the rotor or impeller is accessible only after the diflicult and complex job of completely dismantling the machine.

In contradistinction, the present invention teaches the dividing of the turbine-pump unit circumferentially in such fashion as to provide for easy access to the rotor, impeller and other portions of the unit and in addition reduces overall weight and thusly cost of manufacture by incorporating the pump and turbine in a common casing.

While a typical installation for the improved turbinepump unit can be found in a steam power plant cycle wherein the turbine serves primarily as the power producer transmitting useful power to the shaft and coupling at one end and driving the boiler feed pump at the other end the primary application of the unit described herein would be in an installation where fluids of large molecular weight such as expensive fluorinated hydrocarbons act as the working fluid. In such an installation loss of the costly fluid by leakage is kept to a minimum because any leakage from the pump would pass into the turbine and would therefore not be lost from the cycle.

It is apparent then that the number of seals needed to prevent loss of working fluid is kept to a minimum and that construction as hereinafter described not only provides a turbine-pump unit which is simple in construction and low in cost but one that will efiiciently handle fluids of large molecular weight.

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It will be evident to one skilled in the art that the turbine-pump unit contemplated herein can be readily converted to multi-stage operation without departing from the scope of the invention described herein. 7

Accordingly, it is an object of this invention to provide an improved turbine-pump unit embodying the above described features.

In the drawings:

FIGURE 1 is an end view of the turbine-pump unit showing the end of the casing to be rigidly connected to piping associated with the unit.

FIGURE 2 is a longitudinal section showing the turbine-pump unit contemplated herein and taken on line 1-1 of FIGURE 1.

FIGURE 3 is an exploded view of the turbine-pump unit.

Referring more particularly to the drawings, FIGURES l and 3 show the contemplated unit as comprising a turbine pump casing, generally designated 1, divided circumferentially into independent portions 2, 3 and 4 to provide for rapid disassembly thereof in the event that the rotating portions of the like are in need of repair. Furthermore, portion 2 comprising the main casing of turbine pump casing 1 can be fixedly connected at the inlet openings 6, 7 and 8 of the turbine unit 9, and at the inlet opening 10 of the pump unit 11 and their respective outlet openings 12 and 13 to the piping of the system. Provision for rigid connection of the portion 2 to the piping of the system with which the turbine-pump unit is associated coupled with provisions which permit rapid disassembly of the portions 3, and 4 of the casing permit fluid tight sealing at the pipe joints to limit loss of system fluid by leakage and in addition easy access to the rotating portions of the unit.

To reduce the manufacturing costs and provide a unit which is readily repaired applicant divides the turbine pump casing 1 into a first and second compartment 14 and 15 by a partition 16 which is shown as a nozzle for directing working fluid to the rotor 17 of the turbine and the partition at the same time maintaining a fluid tight relation between the first and second compartments.

The rotor 17 as shown in FIGURE 2 is disposed in working relation with the nozzle formed on partition 16 and is mounted on shaft 18 and fixed thereto by hub 19 which extends into the first compartment 14 through opening 20 formed in partition 16. Seals 21 of any well known type and readily purchased on the open market are mounted on hub 19 to maintain the fluid tight seal between the compartments.

Shaft 18 is journaled in bearing members 22 and 23 which are mounted in bearing housing 24 formed in the portion of the casing designated 4.

Stop members 26 and 27 formed in bearing housing 24 and end cover 28 coact to maintain the shaft 18 journaled in the bearings and in addition provide the usual stability desired.

Seal means 29 are connected to casing portion 4 and mounted on shaft 18 at the portion thereof extending into the turbine unit 9. The seal means 29 functioning to prevent leakage from compartment 15 through opening 30 in casing portion 4 to maintain the required and desired fluid tight relationship.

As is clearly shown in FIGURE 2 of the drawings the end portion 31 of shaft 18 extends into the first compartment 14 in overhanging relation.

The impeller 32 of the pump is fixed thereto and is driven by a portion of the energy created in the turbine to pass fluid from. inlet 10 to the outlet 13. The turbine being driven as is usual by fluid entering through inlets 6, 7 and 8 formed in the end portion of easing 2 and as was mentioned above the greater source of power is transmitted to end 5 of the shaft 18. The usual admis sion valve 33 is associated with each of the inlets to provide for the required control of turbine-pump operation.

Provisions taking the form of a pump compartment 34 and a turbine working fluid compartment 35 adapt the end portion 2 of the casing to accommodate both the pump unit and the passageways for passing Working fluid to the nozzle on partition 16.

More specifically the annular extension 36 is fashioned to abut partition 16 to provide the above mentioned pump and turbine Working fluid compartment. A seal member 37 is disposed therein to maintain the required fluid tight relationship.

' In assembly, impeller 32 is mounted on the overhung shaft as by threaded means 38 and adjacent the partition 16. The rotor 17 is also mounted adjacent the partition 16, however, on the other side thereof. Portions 3 and 4 of the casing forming a cover or closure are then mounted about the partition 16 and connected to the main casing 2 as is clearly shown in the drawings. The foregoing elements maintained in the above indicated relationship by a plurality of bolts 39. The bearing housing can then be placed in the opening formed in casing portion 4 to form an operating embodiment which is then rigidly connected to the piping of the system.

While the invention has been described in detail with reference to a specific structure, it is to be understood that the concept of this invention is not limited to those details, but is limited only by the scope of the appended claims.

What is claimed is:

1. In a turbine pump unit, a turbine pump casing comprising a main casing including a partition connected at one end thereof and a closure mounted about the partition and connected to said main casing, one side of said partition and said main casing coacting to form a pumping chamber, the other side of said partition and said closure coacting to form a driving compartment, bearing means disposed on said closure, a shaft in said bearing means and extending into the driving compartment through said partition and into said pumping chamber, pumping means in the pumping chamber and connected to said shaft, a rotor in the driving compartment and connected to said shaft, first inlet and outlet means on the main casing and in communication with the pumping chamber, second inlet and outlet means on the main casing in communication with the driving compartment, and nozzle means on said partition and spaced relative the inlet to said driving compartment to direct motive fluid passing from said inlet to said rotor to cause same to move said pumping means to flow fluid from the inlet means to the outlet means of said pumping chamber.

2. In a turbine pump unit, a turbine pump casing comprising a main casing including a partition connected at one end thereof and a closure mounted about the partition and connected to said main casing, one side of said partition and said main casing coacting to form a pumping chamber, the other side of said partition and said closure coacting to form a driving compartment, bearing means disposed on said closure, a shaft in said bearing means and extending into the driving compartment through said partition and into said pumping chamber, and said shaft in overhanging relation with both said pumping chamber and driving compartment, pumping means in the pumping chamber and connected to said shaft, a rotor in the driving compartment and connected to said shaft, first inlet and outlet means on the main casing and in communication with the pumping chamher, second inlet and outlet means on the main casing in communication with the driving compartment, and nozzle means on said partition and spaced relative the inlet to said driving compartment to direct motive fluid passing from said inlet to said rotor to cause same to move said pumping means to flow fluid from the inlet means to the outlet means of said pumping chamber.

3. In a turbine pump unit, a turbine pump casing comprising a main casing including a partition connected at 4 one end thereof and a closure mounted about the partition and connected to said main casing, one side of said partition and said main casing coacting to form a pumping chamber, the other side of said partition and said closure coacting to form a driving compartment, bearing means disposed on said closure, a shaft in said bearing means and extending into the driving compartment through said partition and into said pumping chamber, and said shaft in overhanging relation with both said pumping chamber and driving compartment, seal means about the portion of said shaft extending through said partition to maintain a fluid tight relationship between the pumping chamber and driving compartment, pumping means in the pumping chamber and connected to said shaft, a rotor in the driving compartment and connected to said shaft, first inlet and outlet means on the main casing and in communication with the pumping chamber, second inlet and outlet means on the main casing in communication with the driving compartment, and nozzle means on said partition and spaced relative the inlet to said driving compartment to direct motive fluid passing from said inlet to said rotor to cause same to move said pumping means to flow fluid from the inlet means to the outlet means of said pumping chamher.

4. In a turbine pump unit, a turbine pump casing comprising a main casing including a partition connected at one end thereof and a closure mounted about the partition and connected to said main casing, one side of said partition and said main casing coacting to form a pumping chamber, the other side of said partition and said closure coacting to form a driving compartment, bearing means disposed on said closure, a shaft in said bearing means and extending into the driving compartment through said partition and into said pumping chamber, and said shaft in overhanging relation with both said pumping chamber and driving compartment, a pumping means in said pumping chamber and connected to said shaft and said pumping means adjacent one side of said partition, a rotor in the driving compartment and connected to said shaft and said rotor adjacent the other side of said partition, first inlet and outlet means on the main casing and in communication with the pumping chamber, second inlet and outlet means on the main casing in communication with the driving compartment, and nozzle means on said partition and spaced relative the inlet to said driving com partment to direct motive fluid passing from said inlet to said rotor to cause same to move said pumping means to flow fluid from the inlet means to the outlet means of said pumping chamber.

5. The combination claimed in claim 4 wherein the closure comprises a ring-like portion disposed about the partition and a portion closing the partition and connected to the main casing.

6. In a turbine pump unit, a turbine pump casing com prising a main casing including a partition connected at one end thereof and a closure mounted about the partition and connected to said main casing, one side of said partition and said main casing coacting to form a pumping chamber, the other side of said partition and said closure coacting to form a driving compartment, a bearing housing detachably connected to said closure, bearing means in said bear-ing housing, a shaft in said bearing means and extending into the driving compartment through said partition and into said pumping chamber, and said shaft in overhanging relation with both said pumping chamber and driving compartment, seal means about the portion of said shaft extending through said partition to maintain a fluid tight relationship between the pump-ing chamber and driving compartment, pumping means in said pumping chamber and connected to said shaft and said pumping means adjacent one side of said partition, a rotor in the driving compartment and connected to said shaft and said rotor adjacent the other side of said partition, first inlet and outlet means on the main casing and in communication with the pumping chamber, second inlet and outlet means on the main casing in communication with the driving compartment, nozzle means on said partition and spaced relative the inlet to said driving compartment to direct motive fluid passing from said 5 inlet to said rotor to cause same to move said pumping means to flow fluid from the inlet means to the outlet means of the pumping chamber, and said pumping means, partition, rotor, shaft, and bearing housing detachable from the main casing to permit easy repair and replace- 0 ment of same.

References Cited in the file of this patent UNITED STATES PATENTS Buchi Aug. 23,

Doelter Nov. 2,

Buchi et a1. Sept. 10,

Davies et a1. Dec. 3,

FOREIGN PATENTS Germany Nov. 29,

France Mar. 13,

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