CN205371092U - Adjustable vane device and festival segmentation multistage centrifugal pump - Google Patents

Abstract

The utility model discloses an adjustable guide vane device and a segmental multistage centrifugal pump. The segmental multistage centrifugal pump comprises: a suction section, a primary impeller, an adjustable guide vane device, a middle section, a secondary impeller, a discharge Section, pump shaft, shaft sleeve, impeller spacer ring, sliding bearing, rolling bearing, elastic connector, and external prime mover; the impeller is assembled on the pump shaft through a key connection; the adjustable guide vane device is assembled in the middle section, pressurized by the impeller The liquid is collected by the adjustable guide vane device and the flow rate is reduced, and discharged into the pipeline system through the discharge section. The adjustable guide vane device of the utility model adjusts the angle of the guide vane according to the pressure at the outlet of the water pump, so that the water pump operates at the efficiency-optimized operating point under any working condition, which improves the hydraulic efficiency of the water pump under partial load and overload conditions. The operation efficiency of the water pump system, especially the variable frequency or variable flow water pump system is improved, and the energy consumption of the water pump system is saved.

Description

Adjustable guide vane device and segmental multistage centrifugal pump

technical field

The utility model relates to the fields of liquid transportation such as industry and agriculture, in particular to an adjustable guide vane device and a vertically installed segmental multistage centrifugal pump using the device.

Background technique

Segmental multistage centrifugal pump is to install multiple impellers on a shaft to work in series, and the number of impellers on the shaft represents the number of stages of the pump. The segmental multistage pump structure is generally divided into a water inlet section, a middle section (the number of the middle section is the number of impellers minus 1) and a water outlet section, and each section is connected into a whole with tension bolts. The suction inlets of the segmental multistage centrifugal pumps are arranged in the same direction. The liquid flows out from the previous stage impeller and enters the inlet of the next stage impeller through the guide vane, so that the energy increases step by step, and finally flows out through the outlet section.

Segmental multistage centrifugal pumps mostly adopt vertical installation design to save space and facilitate installation. The inlet and outlet of the water pump are not on the same axis, the lower part enters the water, the upper part exits the water, and the water inlet section, the middle section and the water outlet section are connected by tension bolts; the water pump and the motor are connected by an elastic coupling (usually a coupling); the seal is generally used Machinery Seal. Segmental multistage centrifugal pumps are used in industrial and agricultural liquid transportation, urban water supply and drainage, pressurized water supply for high-rise buildings, fire pressurization, long-distance water delivery and boiler water supply, etc.

In addition, with the development of industry, environmental pollution is becoming more and more serious, so the requirements for carbon emissions are becoming more and more stringent, which forces products to be continuously upgraded and energy-efficient solutions to be continuously provided. In the field of water pump systems, the commonly used method is to use frequency conversion technology. Frequency conversion technology has made a great contribution to the energy saving of water pump systems. However, the design of water pumps is optimized according to the rated point (that is, the efficiency of the water pump is the highest at the rated flow rate). When the pump deviates from the rated point, that is, under partial load and overload conditions, its efficiency is low, and the farther it deviates from the rated flow, the more its efficiency drops.

The purpose of this utility model is to propose an adjustable guide vane device and a new type of adjustable guide vane device for the technical defects of the existing segmental multistage centrifugal pump with low efficiency under partial load and overload conditions. Segmental multistage centrifugal pump.

Among them, the adjustable guide vane device adjusts the angle of the guide vane according to the pressure at the outlet of the pump, so the water pump operates at the efficiency-optimized operating point under any working condition, which improves the hydraulic efficiency of the pump under partial load and overload conditions, and improves the efficiency of the pump. The operating efficiency of the water pump system, especially the variable frequency or variable flow pump system, saves the energy consumption of the water pump system.

Utility model content

In order to achieve the above purpose, the utility model provides an adjustable guide vane device, which is used to adjust the guide vane angle according to the water pump outlet pressure signal, thereby improving the operating efficiency of the water pump under partial load and overload conditions, which includes: Drive device, feedback signal processor, power transmission mechanism, helical pinion shaft, driving gear, guide vane and driven gear. The feedback signal processor receives and processes the pressure signal from the water pump outlet pressure sensor to determine the The deflection angle of the guide vane; wherein, the driving device is connected to and drives the helical toothed shaft through the power transmission mechanism, the helical toothed shaft is meshed with the driving gear through a gear, and the driven gear is connected to the driven gear The driving gear is meshedly connected, and the guide vane is connected with the driven gear.

The adjustable guide vane device adjusts the angle of the guide vane according to the pressure at the outlet of the water pump, so that the water pump operates at the efficiency-optimized operating point under any working condition, and the hydraulic efficiency of the water pump under partial load and overload conditions is improved.

For a given hydraulic design, there is a one-to-one correspondence between pressure and flow, that is, different pressures correspond to different flows, and different flows correspond to different liquid outlet velocities of the impeller. When the angle of the guide vane is consistent with the direction of the fluid outlet velocity, Minimal hydraulic loss and highest hydraulic efficiency. The adjustable guide vane device adjusts the angle of the guide vane according to the signal fed back by the pressure sensor (usually installed at the pump outlet), so as to ensure that the water pump operates at the optimal efficiency point under any working condition (the relationship between the outlet pressure of the water pump and the guide vane angle, Generally determined by hydraulic simulation and corrected by experiments).

The utility model also provides a segmental multistage centrifugal pump including the above-mentioned adjustable guide vane device, which includes:

The base, the water inlet section, the middle section, the water outlet section, the prime mover bracket and the prime mover are axially connected in sequence from bottom to top; the base is provided with a bearing seat; the prime mover bracket is used to connect the prime mover and the mechanical parts of the centrifugal pump ; the prime mover is used to pump the liquid to a given height;

The pump shaft is axially accommodated in the water inlet section, the middle section and the water outlet section, and the pump shaft is sleeved with a first-stage impeller, a secondary impeller, a final-stage impeller, a shaft sleeve and an impeller spacer ring;

The prime mover is connected to the pump shaft through an elastic connector, and the power is transmitted to the secondary impeller and the first stage impeller through the pump shaft, so that the elastic connector is driven by the prime mover and drives the pump shaft rotation;

A shaft sleeve is sleeved on the end of the pump shaft close to the bearing seat, so as to prevent the pump shaft from being worn;

A sliding bearing, assembled in the bearing housing and sleeved on the outside of the sleeve, is used to slide and support the pump shaft, and a plurality of spiral grooves are formed on the inner wall of the sliding bearing;

a rolling bearing, sleeved on the end of the pump shaft close to the elastic connector, for rolling support of the pump shaft;

The water inlet section is assembled on the base, the flow channel of the liquid in the water inlet section is a flow channel, and the mouth of the flow channel is a suction port;

The middle section is assembled between the water inlet section and the water outlet section to assemble the above-mentioned adjustable guide vane device, which includes: a driving device, a feedback signal processor, a power transmission mechanism, a helical gear shaft, a driving gear, a guide vane and a driven gear, the feedback signal processor receives and processes the pressure signal from the water pump outlet pressure sensor, so as to determine the deflection angle of the guide vane; wherein, the drive device is connected through the power transmission mechanism and drives the A helical gear shaft, the helical gear shaft is meshed with the driving gear through a gear, the driven gear is meshed with the driving gear, and the guide vane is connected with the driven gear;

The water outlet section is assembled between the middle section and the prime mover bracket and connected with the prime mover bracket, and a mechanical seal is provided between the water outlet section and the pump shaft; the liquid flow part in the water outlet section is a flow channel , the mouth of the flow channel is a discharge port;

The first-stage impeller is assembled on the end of the pump shaft close to the sliding bearing through a key connection, and the pump shaft drives the first-stage impeller to rotate, thereby pressurizing and delivering the liquid introduced from the water inlet section to the adjustable guide vane device;

Both the secondary impeller and the final impeller are axially positioned and assembled on the pump shaft through the impeller spacer ring;

The impeller spacing ring is axially sleeved on the pump shaft, and is axially located between the primary impeller and the secondary impeller, between the secondary impeller and the secondary impeller, and between the secondary impeller and the final stage Between the impellers, it is used to separate the impellers and ensure the axial positioning of the impellers on the pump shaft;

The adjustable guide vane device is radially assembled in the middle section, and radially located between the primary impeller and the secondary impeller, between the secondary impeller and the secondary impeller, and between the secondary impeller and the last stage between the impellers.

Wherein, the impeller assembled at the suction end is the primary impeller, and the secondary impeller is located between the primary impeller and the mechanical seal.

Further, hydraulic balance holes are opened on the primary impeller and the secondary impeller for axial force balance.

Wherein, the impeller is separated and axially positioned by the impeller spacer ring, and the impeller spacer ring is positioned on the pump shaft by a retaining ring.

Further, the base is divided into a detachable support seat and a bottom cover, the bearing seat is located in the support seat, and the bottom cover has a boss to support the bearing seat, so the bearing seat can be disassembled from the bottom The bottom cover can replace the sliding bearing without dismantling the pump body, which is convenient for maintenance.

Wherein, the mechanical seal is sleeved on the pump shaft and located between the water outlet section and the pump shaft, and the mechanical seal partially protrudes from the water outlet section to facilitate direct disassembly from the water outlet section, so there is no need to The mechanical seal can be repaired or replaced by disassembling the pump body, which is convenient for maintenance.

Wherein, the prime mover is an electric motor or other types of prime movers, such as an internal combustion engine.

Further, the water inlet section and the water outlet section are both installed in a 360-degree circumferential rotation, and the directions of the liquid suction port and the discharge port are adjustable, which can adapt to pipeline systems installed in different directions.

Further, the water outlet section adopts a volute structure.

The utility model adopts an adjustable guide vane mechanism to adjust the angle of the guide vane according to the pressure at the outlet of the water pump, which improves the hydraulic efficiency of the water pump under partial load and overload conditions, and improves the operation of the water pump system, especially the frequency conversion or variable flow pump system. Efficiency, saving energy consumption of the pump system.

The bearing seat of the utility model can be disassembled from the bottom of the base, so the sliding bearing can be replaced without disassembling the pump body, which is convenient for maintenance.

The mechanical seal of the utility model can be disassembled directly from the top of the water outlet section, so the mechanical seal can be repaired or replaced without disassembling the pump body, which is convenient for maintenance.

The water inlet section and the water outlet section of the utility model can rotate arbitrarily in the circumferential direction, so it can be adapted to the installation of pipeline systems in various directions.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present utility model more clearly, the following will briefly introduce the drawings required for the description of the embodiments.

Fig. 1 is the sectional structure schematic diagram of the segmental multistage centrifugal pump of the present invention;

Fig. 2 is a schematic diagram of the three-dimensional structure of the adjustable guide vane device of the present invention;

Fig. 3 is a schematic diagram of the meshing structure of the helical gear shaft and the driving gear of the adjustable guide vane device of the present invention.

The numbers in the figure indicate:

1. Base 2. Bearing seat 3. Shaft sleeve

4. Sliding bearing 5. Water inlet section 6. Retaining ring

7. Pump shaft 8. Impeller spacer ring 9. First stage impeller

10. Adjustable guide vane device 11. Middle section 12. Secondary impeller

13. Outlet section 14. Nut 15. Bolt

16. Mechanical seal 17. Rolling bearing 18. Coupling

19. Motor bracket 20. Motor 21. Suction port

22. Discharge port 1001. Driving device 1002. Feedback signal processor

1003. Power transmission mechanism 1004. Helical gear shaft 1005. Driving gear

1006. Guide vane 1007. Driven gear

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

As shown in Figure 1, the segmental multistage centrifugal pump of the present utility model specifically includes: base 1, bearing housing 2, bushing 3, sliding bearing 4, water inlet section 5, retaining ring 6, pump shaft 7, impeller interval Ring 8, primary impeller 9, adjustable guide vane device 10, middle section 11, secondary impeller 12, water outlet section 13, mechanical seal 16, rolling bearing 17, coupling 18, motor bracket 19 and motor 20, of which water outlet section 13 The bolt 15 and the nut 14 are connected to the motor bracket 19, and the water outlet section 13 and the pump shaft 7 are sealed by a mechanical seal 16; the flow channel of the liquid in the water inlet section 5 is a flow channel, and the mouth of the flow channel is a suction port 21 ; The liquid circulation part in the water outlet section 13 is the flow channel, and the mouth of the flow channel is the discharge port 22 .

The segmental multistage centrifugal pump is installed on the foundation through the base 1 by fastening bolts. The pump shaft 7 is axially accommodated in the water inlet section 5, the middle section 11 and the water outlet section 13, and the pump shaft 7 is sleeved with a shaft sleeve 3 and an impeller spacer ring 8; the sliding bearing 4 is accommodated in the bearing housing 2, and sleeved On the outside of the shaft sleeve 3; the pump shaft 7 of the water inlet section 5 is supported by the sliding bearing 4 through the shaft sleeve 3, and the pump shaft 7 at one end of the motor 20 is supported by the rolling bearing 17; the impeller spacer ring 8 is positioned on the pump shaft 7 through the retaining ring 6 ; The first stage impeller 9 and the secondary impeller 12 are positioned axially through the impeller spacer ring 8 and assembled on the pump shaft 7 through a key connection.

The shaft sleeve 3 needs to be assembled on the pump shaft 7, so its machining accuracy is relatively high; since the main function of the impeller spacer ring 8 is the axial positioning between the impellers, its machining accuracy is relatively low.

Specifically, the first-stage impeller of the suction section 5 of the segmental multi-stage centrifugal pump is the first-stage impeller 9, and there are a plurality of secondary impellers 12 in the direction of the motor, and the last impeller is the last-stage impeller. For the cavitation performance of multi-stage centrifugal pumps, the first-stage impeller 9 is specially designed, while the design of the secondary impeller and the last-stage impeller are the same.

The adjustable guide vane device 10 behind the first-stage impeller 9 is the first-stage adjustable guide vane device, similarly the adjustable guide vane device 10 behind the secondary impeller 12 is a secondary adjustable guide vane device, and the adjustable guide vane device behind the last-stage impeller The guide vane device 10 is the final adjustable guide vane device, and in order to reduce the complexity of the product, the adjustable guide vane device generally adopts the same design.

The adjustable guide vane device 10 is the energy transfer device of the segmental multistage centrifugal pump. Its function is to collect the liquid thrown out by the primary impeller 9 and the secondary impeller 12, so as to reduce the flow velocity of the liquid and convert part of the kinetic energy. In order to evenly introduce the pressure energy into the next-stage impeller, the adjustable guide vane device 10 makes the liquid flow in a continuous streamlined flow channel, which is not easy to form dead angles and sudden diffusion, and the liquid velocity changes relatively uniformly, with good hydraulic performance.

Fig. 2 is a schematic diagram of the adjustable guide vane device of the present invention. First, the feedback signal processor 1002 receives and processes the pressure signal from the water pump outlet pressure sensor to determine the deflection angle of the guide vane; The power is transmitted to the helical gear shaft 1004, the helical gear shaft 1004 drives the driving gear 1005 to rotate clockwise or counterclockwise, the driven gear 1007 drives the guide vane 1006 to rotate clockwise or counterclockwise through gear transmission, and adjusts the guide vane 1006 to the optimal Angle position, the water pump runs at the efficiency-optimized working point, which improves the hydraulic efficiency of the water pump under partial load and overload conditions.

FIG. 3 is a schematic diagram of the components of the adjustable guide vane device of the present invention. The helical gear shaft 1004 transmits motion with the driving gear 1005 through gear meshing.

According to the requirements of the conveying medium, the segmental multistage centrifugal pump of the present invention can choose corresponding materials, such as stainless steel and copper alloy. And the highest head can reach more than 1000 meters.

The pump shaft 7 of the segmental multistage centrifugal pump of the present utility model is directly driven by the prime mover 20 supported on the motor bracket 19 through the elastic coupling 18 . The pump shaft 7 drives the first-stage impeller 9, and several secondary impellers 12 in the middle pump the liquid to a specified height. The adjustable guide vane device 10 is assembled in the middle section 11 . The primary impeller 9 and the secondary impeller 12 are assembled on the pump shaft 7, and the pump shaft 7 drives the impeller to rotate, thereby pressurizing the liquid introduced from the inlet. After the liquid is pressurized by the first-stage impeller 9 from the inlet, it is collected by the adjustable guide vane device 10 and the flow rate is reduced to enter the secondary impeller 12 to continue pressurization. The pressurized liquid is collected by the adjustable guide vane device 10 and the flow rate is reduced to enter the last stage. The stage impeller is pressurized, and the pressurized liquid is discharged from the outlet through the volute-shaped water outlet section 13 and sent into the pipeline system. The cross-sectional area of the volute-shaped water outlet section 13 gradually increases along the outlet direction, and the transition is smooth, the liquid flow rate gradually decreases, and the pressure energy increases. Its streamlined design ensures less hydraulic loss, thereby ensuring an efficient hydraulic design.

According to different head requirements, the number of secondary impellers 12 can range from zero to more. If the value of the required head is not an integer multiple of the design head of the impeller, it can be realized by reducing the diameter of the impeller by cutting the impeller, and the head is approximately proportional to the square of the diameter of the impeller (the exact corresponding relationship is generally determined through experiments).

The adjustable guide vane device and the segmental multistage centrifugal pump of the utility model can improve the hydraulic efficiency of the water pump under partial load and overload conditions because the adjustable guide vane device adjusts the angle of the guide vane according to the pressure at the outlet of the water pump. The operation efficiency of the water pump system, especially the variable frequency or variable flow water pump system is improved, and the energy consumption of the water pump system is saved.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An adjustable guide vane device, which is used to adjust the guide vane angle according to the water pump outlet pressure signal, thus improving the operating efficiency of the water pump under partial load and overload conditions, it is characterized in that it includes: a driving device, a feedback signal Processor, power transmission mechanism, helical gear shaft, driving gear, guide vane and driven gear, the feedback signal processor receives and processes the pressure signal from the water pump outlet pressure sensor to determine the deflection of the guide vane Angle; wherein, the driving device is connected and drives the helical gear shaft through the power transmission mechanism, the helical gear shaft is meshed with the driving gear through gears, and the driven gear is meshed with the driving gear , the guide vane is connected with the driven gear. 2. A segmented multistage centrifugal pump, characterized in that it comprises: The base, the water inlet section, the middle section, the water outlet section, the prime mover bracket and the prime mover are axially connected in sequence from bottom to top; the base is provided with a bearing seat; the prime mover bracket is used to connect the prime mover and the mechanical parts of the centrifugal pump ; the prime mover is used to pump the liquid to a given height; The pump shaft is axially accommodated in the water inlet section, the middle section and the water outlet section, and the pump shaft is sleeved with a first-stage impeller, a secondary impeller, a final-stage impeller, a shaft sleeve and an impeller spacer ring; The prime mover is connected to the pump shaft through an elastic connector, and the power is transmitted to the secondary impeller and the first stage impeller through the pump shaft, so that the elastic connector is driven by the prime mover and drives the pump shaft rotation; A shaft sleeve is sleeved on the end of the pump shaft close to the bearing seat, so as to prevent the pump shaft from being worn; A sliding bearing, assembled in the bearing housing and sleeved on the outside of the sleeve, is used to slide and support the pump shaft, and a plurality of spiral grooves are formed on the inner wall of the sliding bearing; a rolling bearing, sleeved on the end of the pump shaft close to the elastic connector, for rolling support of the pump shaft; The water inlet section is assembled on the base, the flow channel of the liquid in the water inlet section is a flow channel, and the mouth of the flow channel is a suction port; The middle section is assembled between the water inlet section and the water outlet section for assembling the adjustable guide vane device described in claim 1; The water outlet section is assembled between the middle section and the prime mover bracket and connected with the prime mover bracket, and a mechanical seal is provided between the water outlet section and the pump shaft; the liquid flow part in the water outlet section is a flow channel , the mouth of the flow channel is a discharge port; The first-stage impeller is assembled on the end of the pump shaft close to the sliding bearing through a key connection, and the pump shaft drives the first-stage impeller to rotate, thereby pressurizing and delivering the liquid introduced from the water inlet section to the adjustable guide vane device; Both the secondary impeller and the final impeller are axially positioned and assembled on the pump shaft through the impeller spacer ring; The impeller spacing ring is axially sleeved on the pump shaft, and is axially located between the primary impeller and the secondary impeller, between the secondary impeller and the secondary impeller, and between the secondary impeller and the final stage Between the impellers, it is used to separate the impellers and ensure the axial positioning of the impellers on the pump shaft; The adjustable guide vane device is radially assembled in the middle section, and radially located between the primary impeller and the secondary impeller, between the secondary impeller and the secondary impeller, and between the secondary impeller and the last stage between the impellers. 3. The segmental multistage centrifugal pump according to claim 2, wherein the impeller assembled at the suction end is the primary impeller, and the secondary impeller is located between the primary impeller and the mechanical seal. between. 4 . The segmental multistage centrifugal pump according to claim 2 , wherein hydraulic balance holes are opened on the primary impeller and the secondary impeller for axial force balance. 5. The segmental multistage centrifugal pump according to claim 2, characterized in that, the impellers are separated and axially positioned by the impeller spacer ring, and the impeller spacer ring is positioned on the on the pump shaft. 6. The segmental multistage centrifugal pump according to claim 2, wherein the base is divided into a detachable support seat and a bottom cover, the bearing seat is located in the support seat, and the bottom cover There is a boss to support the bearing housing. 7. The segmental multistage centrifugal pump according to claim 2, wherein the mechanical seal is sleeved on the pump shaft and located between the outlet section and the pump shaft, and the mechanical seal Partially protruding from the water outlet section to facilitate direct disassembly from the water outlet section. 8. The segmental multistage centrifugal pump according to claim 2, wherein the prime mover is an electric motor or an internal combustion engine. 9. The segmental multistage centrifugal pump according to claim 2, characterized in that, the water inlet section and the water outlet section are installed in a 360-degree circumferential rotation, and the directions of the liquid suction port and the discharge port are adjustable. 10. The segmental multistage centrifugal pump according to claim 2, characterized in that, the outlet section adopts a volute structure.