CN220869665U - Submerged centrifugal pump with long shaft of special structure - Google Patents

Abstract

The utility model discloses a special-structure long-shaft submerged centrifugal pump, which relates to the technical field of single-stage single-suction vertical pumps and comprises a transmission shaft and a pump shaft, wherein a main coupling is fixedly arranged at one end of the transmission shaft, a sleeve-type coupling is fixedly arranged at the other end of the transmission shaft, an extension shaft sleeve is fixedly arranged at one end of the pump shaft, an impeller is arranged at the other end of the pump shaft, a liquid outlet pipe is fixedly arranged on a pump shell outside the impeller. The series of pumps have excellent hydraulic performance, adopt the spiral case structure, the independent side of drain pipe goes out hydraulic loss little, efficient, the commonality of this series of pumps utensil part is strong, long service life has very high fail safe nature to easy maintenance is simple.

Description

Submerged centrifugal pump with long shaft of special structure

Technical Field

The utility model relates to the technical field of single-stage single-suction vertical pumps, in particular to a long-shaft submerged centrifugal pump with a special structure.

Background

The utility model mainly relates to a single-stage single-suction vertical pump technology, and a long-shaft submerged pump belongs to a single-stage single-suction vertical pump, and can be arranged on a tank or a foundation above a liquid pool according to requirements. The lower part of the pump body is submerged below the liquid level, and is commonly used for conveying clean or liquid containing a small amount of solid particles, and a packing seal is adopted.

When the temperature sensitive or easily solidified crystallization medium is required to be conveyed, the bearing failure of the pump is easy to cause, the static and dynamic parts are blocked, and the pump is seriously locked and cannot operate.

Disclosure of utility model

Aiming at the defects of the prior art, the utility model provides a special-structure long-shaft submerged centrifugal pump, which solves the technical problems that the bearing of the pump is easy to break down, the moving and static parts are jammed, and the pump is seriously locked and cannot operate when a temperature-sensitive or easily-solidified crystallization medium needs to be conveyed in the prior art.

In order to achieve the above purpose, the utility model is realized by the following technical scheme: the submerged centrifugal pump with the long shaft and the special structure comprises a transmission shaft and is characterized in that a main coupler is fixedly arranged at one end of the transmission shaft, a sleeve type coupler is fixedly arranged at the other end of the transmission shaft, an extension shaft sleeve is fixedly arranged at one end of the pump shaft, an impeller is arranged at the other end of the pump shaft, and a liquid outlet pipe is fixedly arranged on a pump shell outside the impeller.

Preferably, one end of the main shaft coupler is provided with a transmission shaft, a ball bearing body is arranged outside the transmission shaft, and the ball bearing body is arranged on the foundation plate.

Preferably, one end of the transmission shaft is fixedly connected with a sleeve type coupling, one end of the sleeve type coupling is connected with a pump shaft, a bearing sleeve is arranged on the pump shaft, the bearing sleeve is rotatably arranged in the middle bearing seat, and a sliding bearing is arranged between the pump shaft and the pump body.

Preferably, the support tube is a double-layer tube, a steam heat preservation cavity is formed in the support tube, and air ducts are arranged on the support tube and the middle bearing seat.

Preferably, the pump shaft is rotatably arranged in the pump body, a centrifugal impeller is arranged on the pump shaft, one end of the pump body is connected with a water inlet pipe, and one end of the water inlet pipe is provided with a water filtering box.

Preferably, the bearing body and the liquid outlet pipe are arranged on the base plate, and the steam pipe is connected to the base plate and the liquid outlet pipe.

Advantageous effects

The utility model provides a special-structure long-shaft submerged centrifugal pump, which adopts a multi-shaft design, and a pump shaft adopts a reliable sleeve type coupling to realize the maximum insertion depth by matching with an upper, middle and lower multipoint guide bearing supporting structure. The series of pumps have excellent hydraulic performance, adopt the spiral case structure, the independent side of drain pipe goes out hydraulic loss little, efficient, the commonality of this series of pumps utensil part is strong, long service life has very high fail safe nature to easy maintenance is simple.

Drawings

Fig. 1 is a schematic structural diagram of a submerged centrifugal pump with a long shaft and a special structure according to the present utility model.

In the figure: 1. a driver; 2. a main coupling; 3. a bearing body; 4. an upper support tube; 5. a pump body; 6. a liquid outlet pipe; 7. a drive shaft; 8. a transmission shaft; 9. a ball bearing; 10. a bearing sleeve; 11. a pump shaft; 12. a sliding bearing; 13. a steam heat preservation cavity; 14. an air duct; 15. a centrifugal impeller; 16. a water inlet pipe; 17. a water filtering box; 18. a base plate; 19. an air supply pipe; 20. a flushing port;

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the present utility model provides a technical solution: the utility model provides a special construction major axis submerged centrifugal pump, includes transmission shaft 8, its characterized in that, transmission shaft 8 one end fixed mounting has main shaft coupling 2, transmission shaft 8 other end fixed mounting has sleeve type shaft coupling, pump shaft 11 one end fixed mounting has the extension axle sleeve, the pump shaft 11 other end is provided with impeller 15, fixed mounting has drain pipe 6 on the pump body 5 outside the impeller.

The embodiment is further configured that a transmission shaft 8 is arranged at one end of the main coupling 2, a ball bearing body 9 is arranged outside the transmission shaft 8, and the ball bearing body 9 is arranged on a base plate 18.

The embodiment is further configured in that one end of the transmission shaft 8 is fixedly connected with a sleeve-type coupling, one end of the sleeve-type coupling is connected with a pump shaft 11, a bearing sleeve 10 is installed on the pump shaft 11, the bearing sleeve 10 is rotatably installed in the middle bearing seat, a sliding bearing 12 is arranged between the pump shaft 11 and the pump body 5, and a flushing port 20 is formed in the pump body 5.

The embodiment is further configured in such a way that the support tube 4 is a double-layer tube, a steam heat insulation cavity 13 is formed in the support tube 4, and an air duct 14 is arranged on the support tube 4 and the middle bearing seat.

The embodiment is further configured in that the pump shaft 11 is rotatably installed in the pump body 5, the centrifugal impeller 15 is installed on the pump shaft 11, one end of the pump body 5 is connected with the water inlet pipe 16, and a water filtering box 17 is fixedly installed at one end of the water inlet pipe 16.

The embodiment is further configured in such a way that the bearing body 3 and the liquid outlet pipe 6 are mounted on the base plate 18, and the steam pipe 19 is connected to the base plate 18 and the liquid outlet pipe 6.

The detailed connection means are known in the art, and the following mainly describes the working principle and process, and the specific work is as follows.

Examples: as shown in fig. 1, the SVD type high-temperature long-axis submerged pump is a single-stage, single-suction, volute type vertical long-axis submerged pump. Completely meets the standard requirements of GB/T5656-2008 centrifugal pump technical condition (class II), and partially meets the standard requirements of API610 twelfth edition centrifugal pump for petroleum, petrochemical and natural gas industries. The serial pumps have the advantages of strong part universality, long service life, high safety and reliability and convenient and simple maintenance.

The serial pumps adopt a multi-shaft design, the pump shaft adopts a reliable sleeve type coupling, and the maximum insertion depth is realized by matching with an upper, middle and lower multipoint guide bearing supporting structure. The series of pumps have excellent hydraulic performance, the volute structure is adopted, the hydraulic loss on the independent side of the liquid outlet pipe 6 is less, and the efficiency is high.

The series of pumps are provided with closed impellers, open impellers and other scheme configurations, and can be suitable for conveying various clean or impurity-containing mediums. Under normal conditions, the shaft seal is not contacted with a pumping medium, and no dynamic seal leakage point exists, so that the seal adopts a labyrinth seal or a packing seal, and an external flushing or self-flushing mode is adopted. The sliding bearing 12 is used for supporting the liquid level below the liquid level to increase the rigidity of the shaft and increase the critical rotation speed of the rotor. The sliding bearing 12 of the series of pumps mainly comprises a bearing support, a guide bearing and a shaft sleeve 3. The sliding bearing 12 is rinsed by self-rinsing.

When the self-flushing pipeline is partially positioned above the liquid surface in the traditional self-flushing mode of the sliding bearing 12, the temperature is lower than the melting point of the medium, so that the flushing liquid at the sliding bearing 12 is crystallized, and serious blockage phenomenon occurs; even if the temperature decrease is small, the viscosity of the medium increases, which affects the lubrication effect of the sliding bearing 12 and reduces the service life of the sliding bearing 12. The sliding bearing 12 body part of the series of pumps adopts special design, a liquid outlet hole and a self-flushing hole are processed on the sliding bearing 12 body, and a pressure relief hole is arranged on a supporting pipe. The position of the sliding bearing 12 is always in a low pressure area due to the existence of the pressure relief hole when the pump works, so that the medium flowing through the outlet of the pump flows to the position of the sliding bearing 12 through the self-flushing hole to flush and lubricate the sliding bearing 12, and no crystallization phenomenon occurs.

When the medium has volatility or has inflammable and explosive danger, a nitrogen auxiliary interface is arranged on the sealing box body. The nitrogen forms a gas sealing cavity through the gaps of the filler and the shaft sleeve, so that the medium is isolated from the atmosphere.

In order to keep the medium temperature to the greatest extent, a steam heat preservation cavity 13 is arranged outside the pump body, the liquid outlet pipe 6, the sliding bearing 12 body, the supporting pipe and the sealing box body, and all the heat preservation cavities are communicated in sequence through pipelines. For ease of installation, the steam inlet and outlet flange interfaces are arranged above the pump base plate.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Claims (1)

1. The utility model provides a special construction major axis submerged centrifugal pump, includes transmission shaft (8), its characterized in that, transmission shaft (8) one end fixed mounting has main shaft coupler (2), transmission shaft (8) other end fixed mounting has sleeve type shaft coupling, and pump shaft (11) one end fixed mounting has extension sleeve, the pump shaft (11) other end is provided with impeller (15), fixed mounting has drain pipe (6) on pump body (5) outside the impeller, main shaft coupler (2) one end is provided with transmission shaft (8), install ball bearing body (9) outside transmission shaft (8), ball bearing body (9) are installed on basic board (18), transmission shaft (8) one end fixed connection sleeve type shaft coupling, sleeve type shaft coupling one end is connected with pump shaft (11), and pump shaft (11) are installed bearing housing (10), bearing housing (10) rotate and are installed in the intermediate bearing frame, be provided with slide bearing (12) between pump shaft (11) and pump body (5), set up on pump body (5) and have rinse mouth (20), stay tube (4) are provided with in bilayer tube (4), set up in the stay tube (14) and in the intermediate bearing frame (14), install centrifugal impeller (15) on pump shaft (11), pump body (5) one end is connected with inlet tube (16), inlet tube (16) one end fixed mounting has drainage box (17), bearing body (3) and drain pipe (6) are installed at foundation plate (18), be connected with steam pipe (19) on foundation plate (18) and drain pipe (6).