Centrifugal screw pump

FIELD: engines and pumps.

SUBSTANCE: centrifugal screw pump comprises a housing (1) with inlet (2) and outlet (3), a pump head (4), a partition (5), a shaft (6) an impeller (7) and a screw (8). The housing (1) and the pump head (4) are connected to the bearing housing (9). There is a high-pressure chamber (10) between the partition (5) and the pump head (4) which is connected to the outlet (3) by passages (11). The partition (5) forms a hub plate (13) seal (12) of the impeller (7) and groove seals (14), (15) of the barrel (16), the separating chamber (17) is positioned between them and connected to the chamber ( 10) by the holes (18). The partition (5), the plate (13) and the barrel (16) form a discharging chamber (19) which is connected to the impeller (7) entrance chamber (21) by the holes (20) in the plate (13). There is a drain cavity (22) behind the seal (15) which is separated from the bearings (24), (25) by the shaft (6) seal (26). The cavity (22) is connected by drain passages (23) which are made in the pump head (4).

EFFECT: exclusion of environment air entering the pump and the deterioration of its anti-cavitation properties by maintaining the chamber pressure close to the pressure at the pump outlet during the pump operation.

3 cl, 1 dwg

 



 

Same patents:

Auger wheel pump // 2539934

FIELD: engines and pumps.

SUBSTANCE: proposed pump comprises housing 1, drain chamber 2, discharge pipe 3, rotor shaft 4, auger 5, wheel 7 and impeller 8, said shaft 4 being hollow. Shaft hollow part is communicated via bore 6 with auger blade channel while by bore 9 with impeller chamber. Impeller chamber is communicated via slit gap in shaft 11 with drain chamber 2.

EFFECT: expanded range of pump cavitation stability, higher efficiency, decreased weight and sizes.

1 dwg

Auger wheel pump // 2534918

FIELD: engines and pumps.

SUBSTANCE: proposed pump comprises rotor with booster auger (2) fitted on its shaft (1), bearing support (3) at pylons (4), pre-auger (5) and impeller (6). Guide vanes (7) aligned with pylons (4) of bearing support (3) are arranged between booster auger and pre-auger (2, 5). Leading and trailing parts of guide vanes (7) are bent in direction of rotor rotation.

EFFECT: higher suction capacity and cavitation factor of rpm.

2 dwg

Auger wheel pump // 2534334

FIELD: engines and pumps.

SUBSTANCE: proposed pump front collar if provided with two floating rings 7 and 8 of groove seals, shaped spacer bush 9 shaped spacer bush 9 with inner and outer cavities 10 and 11 connected via holes 12 is fitted in pump housing 4 between floating rings 7, 8. Chamber 11 is connected with manifold 15 while manifold chamber is connected via holes 16 with pump inlet chamber 17.

EFFECT: higher-efficiency high rpm rotary pump with high anti-cavitation properties.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the field of pump engineering and intended for transfer of oil and other liquids from pipelines during their repair when the maximum drainage of the pipeline is required. The device for oil transfer from pipelines contains a pump consisting of a case, a rotor with an impeller and the primary axial-vortex step set before the impeller inlet. The pump case is made as a plain pipe through which the device attachment fitting is moved freely thus providing installation of the pump up to the stop at the lower part of a pipe with any diameter. Entry to the primary axial-vortex step is radial. Before entry to the primary axial-vortex step there are radial vanes installed which pass into the fixed vanes of the axial-vortex step.

EFFECT: invention is oriented to manufacturing of a universal device for oil transfer from pipelines of different diameter that ensures minimum residual level.

2 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed assembly comprises pumps of condensate first and second lift integrated in common rigid outer housing. Said outer housing with all units arranged there inside are centrally symmetric about fixed vertical axis. Elliptic outer housing is furnished with sealed cover. Suction chamber side walls has condensate intake openings at the level of condenser bottom. Booster presser chamber accommodates even number of identical vertical low- and high-rpm axial polyrow pumps of first lift with one-side condensate inflow and identical horizontal low- and high-rpm axial polyrow pumps of second lift with double-side condensate inflow and discharge into pressure pipes of symmetric chamber of booster chambers. Impeller and distributors of all pumps are multiplanar components with the number of impeller vane cascades making 2-5 and 1-3. Said first cascades are shaped to truncated augers. Impellers and distributors with their casings are composed of cartridges tightly fitted in assembly outer housing.

EFFECT: better anti-cavitation properties, higher reliability, longer life.

5 dwg

FIELD: engines and pumps.

SUBSTANCE: channel includes centrifugal pump, transmission, booster and intake tube, which are in-series connected to housings and flow cavities. In the section of intake tube, channel is formed with its housing. In booster section, the channel is restricted with booster housing on the outside, and with screw bushing on the inner side, which is equipped with impeller, and housing of straightening unit. Screw inlet channel includes anti-cavitation section and variable cross section of channel, which converges in the flow direction. In the transmission section, the channel is restricted with assembled housing of section on the outer side, and with fixed separating pipe - cover relative to the housing on the inner side in section of connecting housing so that annular flow cavity is formed. In sections of end housings of the section, which include supports with bearings, the latter are connected to the corresponding housing by means of longitudinal ribs so that honeycomb hydraulically transparent section of the channel is formed.

EFFECT: creation of pump channel intended for pumping of oil-bearing liquids with increased stability and operating life, increased efficiency and reduced power consumption in no-cavitation modes.

8 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: structural row of vertical electrically driven oil pumps (EOP) includes single-type vertical oil EOP with similar capacity and with the head that is differentiated from pump to pump, as well as with suitable power of electric motor. Each EOP includes the main pump, transmission, booster and intake tube, which are in-series connected to electric motor in downward direction. Main pump includes rotor shaft and at least one pressure section with impeller and guide vane, supply channel and discharge section. In booster housing there arranged is screw with the shaft on which there fixed is bushing with multi-flow impeller. Streamlined surface of bushing has the shape of an unduloid. Bushing inlet includes anti-cavitation section and transition section with radius that is enlarged in flow direction to radius of outlet section. Booster impeller is provided with multi-stage increase in flow direction and in geometrical progression of quantity and number of flows of spiral blades of screw. Pressure sections are in-series connected in the main pump and have the possibility of transmitting the pressure to each subsequent section and/or to the outlet of pressure line, which is added to the pressure created in each of the previous sections. Total number of pressure sections is not less than that determined with ratio of the specified pump head to the head created with one section.

EFFECT: creation of a number of EOP with increased stability and operating life at increase in efficiency, and reduction of power consumed for pumping of any kinds of oil-bearing media, including in no-cavitation modes.

8 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: invention relates to machine building. Booster comprises casing, screw fitted on shaft, liner with multistart impeller, and straightener blade to make flow channel together with said casing. Said flow channel on axial length of said screw comprises three consecutive sections, i.e. inlet anti-cavitation section, transition section, and outlet pressure section. Said screw has at least two vanes with the length of lengthwise helical twist crossing anti-cavitation section and extends over the length of transition and outlet sections. The latter are provided with at least two sets of vanes arranged stepwise and increasing in number in geometric series. The number of vanes at outlet is four times larger than that at inlet. Liner features unduloid shape with generator representing concave-convex flat curve with gradient of radius increment at transition section two times greater than that at anti-cavitation section.

EFFECT: ruled out cavitation in booster and pump.

9 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: system includes electric motor with rotor shaft and is made in the form of pump, transmission and booster, which are in-series connected to it. Transmission has at least one assembly section. System has extended tubular shape on the larger part of its length. Transmission of torque from electric motor to booster and transfer of pumped medium from intake pipe to pump are opposite directed. The part of the unit, which is located below support flange of the pump, is semi-submersible. Section of transmission includes assembled housing containing two end housings connected by means of a connecting housing, in which rotor shaft is installed with possibility of torque transmission and enclosed in separating pipe so that a flow cavity is formed between the latter and the above housings. Supports of rotor shaft are mounted into end housing of transmission section by means of ribs totally forming hydraulic transparent honeycomb channel of flow cavity in each end housing.

EFFECT: stable and long-term pumping of oil-bearing fluids in no-cavitation modes at increased efficiency and reduced power consumption is provided.

7 cl, 3 dwg

FIELD: engines and pumps.

SUBSTANCE: unit includes in-series connected electric motor, main pump, transmission, booster and intake pipe. Main pump includes rotor shaft and at least one pressure section with impeller and guide vane, supply channel and discharge channel. In booster housing there arranged is screw with the shaft on which there fixed is bushing with multi-flow impeller. Bushing inlet includes anti-cavitation section provided with transition section with radius that is enlarged in flow direction to radius of outlet section. Booster impeller is provided with multi-stage increase in flow direction and in geometrical progression of quantity and number of flows of spiral blades of screw. Sections of the main pump are in-series connected and have the possibility of transmitting the pressure to each next section and/or to the outlet of pressure line, which is added to the pressure created in each of the previous sections.

EFFECT: increase in stability and operating life at enhancement of efficiency and reduction of power consumption and pumping in no-cavitation modes.

18 cl, 5 dwg

FIELD: machine building.

SUBSTANCE: shaft is balanced during balancing of a rotor assembly of a centrifugal compressor, and impellers are balanced on a balancing mandrel with a conical mounting surface, thus determining and marking on the shaft and hubs of impellers the places of maximum radial beating of mounting surfaces; impellers are put on the shaft with a preload, thus combining marked places on the shaft and on the hub. An impeller is put on the balancing mandrel with a preload so that a cover disc can face towards increase of diameter of the conical mounting surface.

EFFECT: improving balancing accuracy due to minimisation of mounting imbalance of a rotor impeller, which is determined by its deformation at installation.

2 dwg

FIELD: machine building.

SUBSTANCE: invention refers to machine building and can be used at mounting of rotor assemblies of gas compressor units. When a rotor is assembled, a shaft and all its elements are balanced, the assembled rotor is balanced and fixed to the shafts of a motor and a compressor, mounting disbalances are corrected by weight units, their weight is determined on the basis of the weights of the rotor assembly parts whose disbalances are corrected in these planes, the values of balancing rotor surfaces' beating and the distance from the point of the weight unit installation to the rotation axis. Four points are chosen and marked on every control rotor surface, they are arranged pairwise diametrally oppositely in mutually perpendicular planes. Radial beating of control surfaces is measured in the marked points in respect to the zero point after rotor balancing and after the balanced rotor is attached to the shafts of the motor and compressor. The results of both measurements are recorded, the weight units are mounted on the prepared points in the measurement planes, the weight and points for the weight units are determined on the basis of the proposed dependencies.

EFFECT: invention is aimed at improving the rotor assembly balancing accuracy due to the minimisation of local mounting disbalances determined by the eccentricity of installation.

5 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for designing and assemblage of rotors of centrifugal compressors of transfer units. Rotor of the centrifugal compressor containing shaft and installed on it elements, thrust disc installed on the shaft with clearance and interacting with shaft by means of the cone surface and adjacent cone bushing located from the side of shaft collar, pressing ring installed at opposite side of the disc, retaining ring; at that in the shaft (or disc) body a channel is made to connect the clearance between the shaft and disc with the pressure source; at that in it on the seating surface of the disc from the side opposite to the collar a cone surface is made, in it a ring cone element is installed, it interacts with the pressing ring; at that conicity of their surface is higher then conicity of the bushing from the shaft collar side, and ring cone element has end surface interacting with the similar surface of the thrust disc.

EFFECT: invention improves accuracy of rotor assemblage.

2 cl, 1 dwg

FIELD: machine building.

SUBSTANCE: diagnostics method implies that vibration level in information points of the machine body within the informative frequency band is measured, trends of vibration variations in time are drawn up, the obtained values are compared to the rejection limits and the state of the machine parts is estimated on the basis of the comparison results. Change of the vibration trend within the whole service life of the machine is monitored, vibration jumps in time are sorted, trends of vibration overshooting amplitudes are drawn up as well as those of their ratios and increments, stages of machine part damages are stored in memory.

EFFECT: prevention of machine breakdowns under continuous operation by improving the reliability of detecting the machine parts' degradation due to the registration of defects of vibration overshooting amplitudes at early stages that helps to draw a conclusion on the availability of fatigue breakdown process in the machine parts.

2 cl, 7 dwg

Auger wheel pump // 2539934

FIELD: engines and pumps.

SUBSTANCE: proposed pump comprises housing 1, drain chamber 2, discharge pipe 3, rotor shaft 4, auger 5, wheel 7 and impeller 8, said shaft 4 being hollow. Shaft hollow part is communicated via bore 6 with auger blade channel while by bore 9 with impeller chamber. Impeller chamber is communicated via slit gap in shaft 11 with drain chamber 2.

EFFECT: expanded range of pump cavitation stability, higher efficiency, decreased weight and sizes.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: vibrating-damping strap (10) is to be fitted between blower blade (6) body (12) and blower disc (2). Said strap has radially outer surface (18) provided with at least one plate (16a, 16b) in contact with blower blade body and radially inner surface (20) composed by upstream surface (22) facing the disc (2) and downstream surface (24) separated from the latter by ledge (26). Said upstream surface is located radially inward relative to downstream surface. Upstream surface (22) has zone (101) extending radially inward starting at somewhat distance from its upstream end (22a). Upstream surface (22) of radially inner surface (20) starts from recess (103) from upstream end (22a) to change over to ledge (105) radially levelled in direction of inner area wherein extending zone (101) originates.

EFFECT: decreased wear and scoring of contact surfaces.

7 cl, 5 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used for assembling and balancing of modular rotors of compressors of gas transfer units. According to the method of balancing of the modular rotor the shaft is balanced using the plains of correction unbalances at the ends of the shaft and its coupling and the assembled rotor is balanced, meanwhile the flapping of connecting flanges of couplings with reference to their balancing surfaces are measured, the places of the maximum radial flapping of flanges are determined and marked. Then the marked locations are mated and couplings are joined, the assembly is balanced first with correction of the main vector in the plain of the joint, and then with correction of the main moment of unbalances in plains located near balancing surfaces. After that, couplings are disjoined, the rotor is assembled with arranging of the marked locations in one plain, and it is balanced using the plains of correction of unbalances at the ends of the shaft.

EFFECT: invention is aimed at improvement of precision of rotor assembly.

3 dwg

FIELD: engines and pumps.

SUBSTANCE: invention can be used in rocketry, turbopump units of liquid-propellant and nuclear rocket engines. Turbopump unit comprises pump 1, turbine 2 running in bearings 4 and 5, shaft 3 supporting turbine 2 wheel 6 and impeller 7, case 8, separation chamber 9 with shaft 3 seals 10 and 11, chamber 12 arranged downstream of seal 11 between separation chamber 9 and pump 1, and chamber 13 downstream of impeller 7. Seals 10 and 11 separated turbine 2 chamber from pump 1 chamber. Separation chamber 9 is connected with high-pressure chamber 13 via channel 14. Chamber 12 behind seal 11, between separation chamber 9 and pump 1, is integrated with chamber 13 downstream of impeller 7.

EFFECT: higher reliability of engine starting owing to improved cavitation properties of the pump.

6 cl, 4 dwg

FIELD: machine building.

SUBSTANCE: shaping method of a rotor deviation signal in magnetic suspension systems of a rotary machine with current control by means of pulse-width modulation (PWM control) in an electromagnet consists in supply of PWM control signals to input of power amplifier 1. From amplifier 1 output the signals in the form of polygonal shaped voltages are supplied to electromagnet 3. At the same time, current signals are supplied to current converter 2 of electromagnet 3 with further extraction of a variable component of sawtooth current. Further, it is converted to a signal proportional to curvature of sawtooth current signal at the switching interval of a PWM control signal, and its further conversion to a rotor deviation signal.

EFFECT: simplifying a self control scheme and creating a simpler sensorless magnetic suspension device, which will allow simplifying the structure of supports of a rotary machine and increasing interference immunity of magnetic suspension systems.

11 cl, 6 dwg

FIELD: engines and pumps.

SUBSTANCE: casing is composed of central part and appropriate end parts. Note here that said parts have holes distributed over the entire surface except for area around the impeller. Soundproof coat is located at said casing and outer casing to cover the while asst.

EFFECT: decreased noise.

4 cl, 7 dwg

FIELD: machine building.

SUBSTANCE: system and method of dynamic balancing of axial force for centrifugal compressors (10) is described to reduce axial loads on bearings (20). Transmitter or probe (42) measures the parameter linked with the axial load acting on the bearings (20). Based on the measured parameter the pressure in the balancing chamber (34) is controlled to regulate the compensating axial force created by the balancing drum (28).

EFFECT: improved design.

15 cl, 4 dwg

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