CN218760561U

CN218760561U - High-performance vertical pipeline centrifugal pump

Info

Publication number: CN218760561U
Application number: CN202223358429.7U
Authority: CN
Inventors: 顾炀; 赵志妹; 张婷婷; 董志红
Original assignee: Ace Equipment Wuxi Co ltd
Current assignee: Ace Equipment Wuxi Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-03-28
Anticipated expiration: 2032-12-14

Abstract

The application discloses a high-performance vertical pipeline centrifugal pump, which relates to the field of centrifugal pumps, wherein shaft couplings are respectively sleeved on a motor shaft and a pump shaft, and shaft head grooves of the motor shaft and the pump shaft are provided with semi-split snap rings; the split snap ring and the coupling are used for fixedly connecting the shaft part; the calibers of the water suction port and the water outlet at the bottom of the pump body are consistent; a Venturi tube is arranged on a flange of the water suction port pipeline, and the bottom of the Venturi tube is communicated with the pipeline of the water suction port through a flow passage; the tail part of the Venturi tube is connected to the mechanical seal cavity through a flow guide tube, and high-pressure water flow is led out from the pump body. The pump body structure increases the water absorption of the pump body through the change of the caliber of the Venturi tube, the space flow channel water absorption chamber and the water absorption opening, and the stability of the pump body is improved through rigid connection of the semi-snap ring and the coupling.

Description

High-performance vertical pipeline centrifugal pump

Technical Field

The application relates to the field of centrifugal pumps, in particular to a high-performance vertical pipeline centrifugal pump.

Background

The vertical pipeline pump is a single-stage single-suction vertical centrifugal pump and has the characteristics of convenience in installation, small occupied space, simple structure, low manufacturing cost and the like. The pump inlet and the pump outlet are on the same horizontal line, so that the pump can be arranged in the middle of the same section of horizontal pipeline, and the use is very convenient, so the pump is also called as a pipeline pump.

The conventional vertical pipeline pump adopts a single-stage single-suction impeller, so that the hydraulic performance of the conventional vertical pipeline pump is generally not high, and the conventional vertical pipeline pump can only meet the requirements of a single-stage centrifugal pump. In the field of seawater desalination, the integral system of a plurality of customers is designed in a container, a water pump is used as a part of the system, and the occupied space of a vertical pipeline pump is very necessary. If a single pump cannot meet the performance requirement, a plurality of pumps are required to operate, so that the purchasing cost is increased, and the requirement of small installation space is not facilitated.

In the related art, a plurality of vertical centrifugal pumps, such as a water supply pump set, are generally operated in parallel, but when the plurality of centrifugal pumps are operated in parallel, the flow rate is not strictly generated according to the benefit of 1+1=2, and there is usually a break, and the more the number of the centrifugal pumps connected in parallel, the greater the break, the more complicated the operation control. The flow of the outlet valve of each pump must be controlled at the same opening, otherwise, the flow channeling and the vibration are easily caused, and the working efficiency of the whole unit is greatly influenced. Meanwhile, the efficiency of the later operation is not high, one pump unit is broken, and the performance of the whole pump unit can not meet the requirement, so that 1-2 standby pumps which are idle for a long time are often configured, the cost of purchasing pump equipment and a pipeline system of a client can be improved by several times by the pump unit, and meanwhile, the occupied area of the pump unit is very large, so that the pump unit is not beneficial to the integrated, modular and transportable design. In the field of seawater desalination, the integral system of many customers is designed in a container, so that the vertical pipeline pump is necessary to occupy small space as a part of the system.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a high performance vertical pipeline centrifugal pump, solves the problem that current vertical pipe centrifugal pump rotational speed is low and the hydroscopicity is low.

The motor shaft and the pump shaft are respectively sleeved with a coupling, and shaft head grooves of the motor shaft and the pump shaft are provided with a halving snap ring; the split snap ring and the coupler are used for fixedly connecting the shaft part;

the calibers of the water suction port and the water outlet at the bottom of the pump body are consistent; a Venturi tube is arranged on a flange of the water suction port pipeline, and the bottom of the Venturi tube is communicated with the pipeline of the water suction port through a flow channel; the tail part of the Venturi tube is connected to the mechanical seal cavity through a flow guide tube, and high-pressure water flow is led out from the pump body.

Specifically, the coupler wraps the split snap ring, and a washer is arranged between the couplers and fixedly installed through bolts.

Specifically, the water suction port is communicated with a space flow channel water suction chamber, and the space flow channel water suction chamber is communicated with an impeller inlet.

Specifically, a tip nozzle is inserted into the tail of the venturi tube, and the tip nozzle is communicated with the mechanical seal cavity through the flow guide tube;

the inner cavity of the Venturi tube is provided with a vacuum chamber and a diffusion tube, the tip nozzle is positioned in the vacuum chamber, the vacuum chamber is communicated with the diffusion tube, and the tail end of the diffusion tube is a water outlet end.

Specifically, the vacuum chamber sucks the water flow near the water suction port through a vacuum suction effect generated by the flow passage at the bottom end.

The beneficial effect that technical scheme that this application provided brought includes at least: the shaft couplings are respectively sleeved on the motor shaft and the pump shaft, the split snap rings are arranged on the grooves of the shaft head, and the two split snap rings and the coupling are connected in a double rigid mode, so that centering operation can be omitted during installation, and the problems of unbalance, large vibration and deflection and the like under the high-speed condition caused by direct connection of the motor shaft and the pump shaft are solved. The calibers of the water suction port and the water outlet of the pump body are set to be consistent, so that the liquid flow velocities of the cross sections of the flow passages from the pump inlet to the impeller inlet can be ensured to be basically equal, and the problems of pump lift and efficiency reduction of a water pump are avoided. The flange of the water suction port pipeline is provided with the Venturi tube which is respectively communicated with the mechanical seal cavity of the pump body and the flow passage of the water suction port, so that a suction effect can be formed in the Venturi tube, and the water absorption of the pump body near the water suction port is improved.

Drawings

Fig. 1 is a schematic view of the structure of the present conventional centrifugal pump;

FIG. 2 is a schematic structural diagram of a high performance tube centrifugal pump provided by an embodiment of the present application;

FIG. 3 is an enlarged view of a high performance centrifugal pump with pipes A provided by an embodiment of the present application;

fig. 4 is an enlarged view of a high-performance pipe centrifugal pump B provided in the embodiment of the present application.

Reference numerals: 1-half split snap ring, 2-coupler, 21-motor shaft, 22-pump shaft, 23-gasket, 3-water suction port, 4-space flow channel water suction chamber, 5-venturi tube, 51-nozzle, 52-diffuser tube, 53-vacuum chamber, 54-flow channel and 6-mechanical seal cavity.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Under the condition that the conventional vertical pipeline pump adopts a single-stage single-suction impeller, the hydraulic performance is generally not high and can only meet the requirement of a single-stage centrifugal pump, the most conventional solution is to ensure that the vertical pipeline pump has excellent performance superior to the single-stage single-suction centrifugal pump by improving the rotating speed of the centrifugal pump. However, it should be noted that the centrifugal pump can obtain better hydraulic performance, wider flow and higher lift by increasing the rotating speed of the centrifugal pump, but the centrifugal pump is also troublesome due to the increased rotating speed.

A, the vertical pipeline pump is in a short shaft structure, the short shaft is rigidly connected with a motor shaft to transmit torque and axial force, and the short shaft of the vertical pipeline pump is not provided with a bearing. Since the manufacturing cost is greatly increased if the bearing device is provided, there is no economical advantage. The problem to be solved is how to connect the pump stub shaft and the motor shaft more firmly with better concentricity, especially under the condition of increasing the rotating speed (a = omega ^2 r), the radial unbalanced force and deflection are further amplified. It is important to improve the connection rigidity of the 2-segment shaft.

And B, when the rotating speed and the hydraulic performance are improved, the cavitation allowance of the water pump is increased, water cannot be sucked in the reaction, and cavitation is easy to occur, so that the water pump is greatly damaged.

Fig. 2 is a schematic structural diagram of a high-performance pipeline centrifugal pump provided by the embodiment of the present application to solve the above problems. The motor shaft 21 and the pump shaft 22 are respectively sleeved with the coupling 2 and the halving snap ring 1. The half snap rings 1 are arranged in grooves on respective shaft heads, and the shaft couplings 2 are respectively sleeved at the bottoms of respective shaft rods. When the shaft coupling is installed, the two sections of shaft couplings 2 are sleeved on the shaft respectively, the shaft couplings 2 are pushed to the bottom, grooves of shaft heads at the shaft extending ends are exposed, the half-divided snap rings 1 are installed in the grooves, and the shaft couplings 2 at the two ends are pulled back to the positions of the shaft heads. Structurally, the coupling 2 wraps the split snap ring 1 and the two shaft rods and is fixed inside.

Be provided with packing ring 23 between two shaft couplings 2, fix a position through the tang, packing ring 23 has tolerance fit with the tang of shaft coupling 2, can remove centering operation during the installation, and this step is very convenient. After the installation adjustment of the gasket 23 and the shaft coupling 2 is in place, the pump shaft coupling and the motor shaft coupling (the shaft couplings correspondingly installed on respective shaft levers) are tightened through the reamed hole bolts, meanwhile, the bolts also play a role in transmitting torque, and the bolts are centered for the reamed hole bolts. The bolt connection is realized by means of the extrusion between the bolt and the wall of the bolt hole to transmit the torque, so that the pretightening force of the bolt is reduced, and the torque transmission capacity can be improved.

With reference to the pump body structure of fig. 1, the present application addresses the problem of increased cavitation associated with increasing pump speed.

A, in order to obtain better performance, the water absorption caliber of a traditional pump body is generally made to be one specification larger than that of an outlet. So in this application, set up the mouth of absorbing water and the bore of delivery port with the pump body unanimously, because suction can strengthen under the condition that the bore diminishes, the velocity of flow of import can increase like this, is favorable to the suction capacity of centrifugal pump. In addition, the two calibers are uniformly arranged, so that the pipeline pump is straight when being connected to a pipeline, the calibers do not need to be changed through large and small heads, the design and construction of a process pipeline system are facilitated, and the installation space of equipment is reduced.

And B, aiming at the improvement on the aspect of water power in the figure 1, the water suction chamber structure of the traditional pump body is a conventional annular water suction chamber, the scheme is changed into a space flow channel water suction chamber 4, a water suction port 3 is communicated with the space flow channel water suction chamber 4, and the space flow channel water suction chamber 4 is communicated with an impeller inlet. Because the annular water suction chamber can not ensure that liquid can uniformly enter the impeller, when liquid flow passes through the water suction chamber and then is prepared to enter the impeller, the liquid flow can preferentially enter the impeller according to the angle and the route with the short stroke distance, and if a ring column or a baffle is forcibly added, vortex is easily generated. Lower suction performance means inlet losses which reduce the lift and efficiency of the water pump, while the use of annular suction chambers is often only intended to meet structural requirements. After the modification of the space flow channel-shaped water suction chamber, the liquid flow speed of each flow channel section from the pump inlet to the impeller inlet is basically equal, and the flow distribution is basically uniform along the circumference.

C, to the suction problem of water sucking mouth, this application installs venturi 5 on the flange of water sucking mouth position, and venturi 5's afterbody inserts has most advanced nozzle 51, and most advanced nozzle 51 communicates through the honeycomb duct on the machine seals chamber 6 of the pump body. Water in the mechanical seal cavity 6 flows in from the water suction port 3, and high-pressure liquid is led out from the mechanical seal cavity 6 under the action of the Venturi tube 5 to be used as high-pressure jet flow.

The end of the flow guide pipe is a tip nozzle 51, the tip nozzle 51 is arranged in the inner cavity of the Venturi tube 5, a vacuum chamber 53 and a diffusion pipe 52 are arranged in the inner cavity, the tip nozzle 51 is arranged in the vacuum chamber 53, the diffusion pipe 52 is communicated with the vacuum chamber 53 in the horizontal direction, and a flow passage 54 is arranged below the vacuum chamber 53. The diffuser 52 terminates in a water outlet end and the flow channel 54 leads down to a water inlet conduit near the suction inlet (at the inlet flange connecting the spatial flow channel suction chamber 4). When the water in the mechanical seal cavity 6 enters the tail tip nozzle 51, the nozzle opening becomes thinner and the pressure increases gradually, so that the flow velocity of the water jet flow is increased, and a small part of the water is discharged through the tip nozzle 51. A vacuum is created in the enclosed space due to the vacuum chamber 53, causing ambient air, water, etc. to be drawn into the venturi. The flow channel formed in the enclosed space draws water and air from the pump inlet, and mixes with the high-speed water from the nozzle opening and enters the diffuser 52. After entering the diffuser 52, the mixed media will be reduced in flow rate, reducing vibration and noise, and finally discharged into the inlet line in front of the pump.

To sum up, this application cup joints the shaft coupling respectively on motor shaft and pump shaft to through installing on the spindle nose recess and dividing half snap ring, through two and dividing half snap rings and connect the dual rigid connection of shaft coupling, can remove the centering operation from during the installation, solve the unbalance under the high-speed condition that motor shaft and pump shaft directly allied oneself with and bring, vibration and the big scheduling problem of amount of deflection. The calibers of the water suction port and the water outlet of the pump body are arranged consistently, and the original annular water suction chamber is arranged as a space flow channel water suction chamber, so that the liquid flow velocities of all flow channel sections from the pump inlet to the impeller inlet are basically equal, and the problems of pump lift and efficiency reduction are avoided. The flange of the water suction port pipeline is provided with the Venturi tube which is respectively communicated with the mechanical seal cavity of the pump body and the flow channel of the water suction port, so that a suction effect can be formed in the Venturi tube, and the water absorption of the pump body near the water suction port is improved.

The improved vertical pipeline pump has the characteristics of convenience in installation, small occupied space, simple structure, low manufacturing cost and the like, and brings excellent performance through high rotating speed. The prior performance can be obtained by connecting a plurality of pumps in series or in parallel, the manufacturing cost is high, and the prior performance can be realized by only adjusting the rotating speed and the diameter of an impeller. Meanwhile, negative effects are avoided by improving the structure, obvious economic benefits are brought, and products with the same performance have updated volume and weight and can be applied to a plurality of projects with limited equipment space.

The preferred embodiments of the present invention have been described; it is to be understood that the invention is not limited to the particular embodiments described above, and that devices and structures not described in detail are understood to be implemented in a manner common in the art; the skilled person in the art, without affecting the essence of the invention, may make numerous possible variations and modifications, or may modify equivalent embodiments, without departing from the technical solution of the invention; therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A high-performance vertical pipeline centrifugal pump is characterized in that a shaft coupling (2) is sleeved on a motor shaft (21) and a pump shaft (22) respectively, and shaft head grooves of the motor shaft (21) and the pump shaft (22) are provided with semi-split snap rings (1); the split snap ring (1) and the coupling (2) are used for fixedly connecting the shaft part;

the calibers of the water suction port (3) at the bottom of the pump body and the water outlet are consistent; a Venturi tube (5) is arranged on a flange of the pipeline of the water suction port (3), and the bottom of the Venturi tube is communicated with the pipeline of the water suction port (3) through a flow passage (54); the tail of the Venturi tube (5) is connected to the mechanical seal cavity (6) through a guide tube, and high-pressure water flow is led out from the pump body.

2. The high-performance vertical pipe centrifugal pump according to claim 1, wherein the coupling (2) wraps the split snap ring (1), and a washer (23) is arranged between the two couplings (2) and is fixedly installed by bolts.

3. The high-performance vertical pipe centrifugal pump according to claim 1, wherein the water suction port (3) is communicated with a space flow passage water suction chamber (4), and the space flow passage water suction chamber (4) is communicated with an impeller inlet.

4. The high-performance vertical pipe centrifugal pump according to claim 3, wherein a tip nozzle (51) is inserted into the tail part of the venturi tube (5), and the tip nozzle (51) is communicated with the mechanical seal cavity (6) through the flow guide pipe;

the inner cavity of the Venturi tube (5) is provided with a vacuum chamber (53) and a diffusion tube (52), the tip nozzle (51) is positioned in the vacuum chamber (53), the vacuum chamber (53) is communicated with the diffusion tube (52), and the tail end of the diffusion tube (52) is a water outlet end.

5. Vertical pipe centrifugal pump according to claim 4, characterized in that the vacuum chamber (53) sucks the water flow near the suction opening (3) by means of the vacuum suction effect created by the flow channel (54) at the bottom end.