Two-stage middle-open type centrifugal pump for conveying high-pressure and high-viscosity crude oil

Abstract

The utility model discloses a two-stage middle-open centrifugal pump for conveying high-pressure high-viscosity crude oil, which comprises a pump body and a pump shaft, the pump shaft is arranged in the pump body, and the pump shaft is fixedly provided with a first-stage impeller and a second-stage impeller in the pump body through a first shaft sleeve and a second shaft sleeve respectively. A sealing monitoring pipe is welded to the position, on one side of the second-stage impeller, of the upper portion of the pump body, a bushing flushing pipe is welded to the position, on one side of the first-stage impeller, of the lower portion of the pump body, a bearing cooling cavity is formed in the lower portion of the driving end bearing component, and a bearing fan is arranged on the inner side of the non-driving end bearing component. The bearing adopts a large oil chamber cavity and a fan structure to ensure the temperature of the bearing and monitor the temperature of the bearing, adopts a two-stage impeller structure to achieve the characteristic of high lift, adopts a middle-open centrifugal pump structure to realize high outlet pressure of the pump, adopts a pump body and a pipeline to perform full-heat-preservation design, and is suitable for conveying high-viscosity media.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a two-stage split-center centrifugal pump for transporting high-pressure and high-viscosity crude oil. Background Art

[0002] Centrifugal pumps are one of the most common pumps used in oil transportation. Based on the principle of centrifugal force, the oil is sucked in and then ejected through the action of centrifugal force. It can be used to transport high-speed, medium-viscosity liquids. Centrifugal pumps have the characteristics of simple structure, low cost, and easy maintenance.

[0003] The existing high-pressure and high-viscosity crude oil is transported under the condition of large flow and high outlet pressure. The transport medium is high-viscosity crude oil with a maximum viscosity of 100mm. 2 / s, so there is an urgent need for an insulated crude oil delivery pump with large flow and high outlet pressure. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a two-stage split-center centrifugal pump for transporting high-pressure and high-viscosity crude oil, which solves the technical problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a two-stage split centrifugal pump for high-pressure and high-viscosity crude oil transportation, comprising a pump body and a pump shaft, the pump shaft being installed in the pump body, the pump shaft being fixedly installed with a first-stage impeller and a second-stage impeller in the pump body by a first sleeve and a second sleeve respectively, the pump body being fixedly connected with a pump cover by bolts and nuts, a sealing monitoring pipe being welded above the pump body on one side of the second-stage impeller, a shaft liner flushing pipe being welded below the pump body on one side of the first-stage impeller, a first drain pipeline and a second drain pipeline being welded on the pump body below the first-stage impeller and the second-stage impeller respectively, a drive-end bearing component being connected to the drive side of the pump body, a non-drive side of the pump body being connected to the non-drive-end bearing component, a bearing cooling chamber being provided below the drive-end bearing component, and a bearing fan being provided inside the non-drive-end bearing component.

[0006] Preferably, an inlet is provided below the first-stage impeller, and an outlet is provided below the second-stage impeller.

[0007] Preferably, the pump shaft is connected to a driving device.

[0008] Preferably, the first-stage impeller and the second-stage impeller adopt a split-type centrifugal pump structure.

[0009] Preferably, the pump body, the shaft liner flushing pipe and the sealing monitoring pipe are all provided with a thermal insulation structure.

[0010] Beneficial Effects

[0011] The utility model provides a two-stage split-center centrifugal pump for high-pressure and high-viscosity crude oil transportation, which has the following beneficial effects: when the device is in use, it adopts a bearing support structure at both ends, a rigid shaft design, strong rotor stability, a large oil chamber cavity and a fan structure for the bearing to ensure the bearing temperature, and monitor the bearing temperature, a two-stage impeller structure to achieve high head characteristics, a split-center centrifugal pump structure, and the pump can be disassembled and repaired without disassembling the pipeline, which is convenient and fast, and achieves a high pump outlet pressure. The pump body and pipeline are fully insulated, which is suitable for conveying high-viscosity media. The sealing cavity is set with pressure monitoring to ensure the sealing cavity pressure and ensure the normal operation of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a two-stage split-center centrifugal pump for transporting high-pressure and high-viscosity crude oil according to the utility model.

[0013] In the figure: 1. bearing fan; 2. pump cover; 3. first sleeve; 4. first-stage impeller; 5. second-stage impeller; 6. seal monitoring tube; 7. drive-end bearing component; 8. pump shaft; 9. non-drive-end bearing component; 10. liner flushing pipe; 11. pump body; 12. first drain pipeline; 13. second drain pipeline; 14. second sleeve; 15. bearing cooling chamber; 16. inlet; 17. outlet. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1The utility model provides a technical solution of a two-stage split-center centrifugal pump for high-pressure and high-viscosity crude oil transportation: a two-stage split-center centrifugal pump for high-pressure and high-viscosity crude oil transportation, comprising a pump body 11 and a pump shaft 8, the pump shaft 8 being installed in the pump body 11, the pump shaft 8 being fixedly installed with a first-stage impeller 4 and a second-stage impeller 5 in the pump body 11 by using a first shaft sleeve 3 and a second shaft sleeve 14 respectively, the pump body 11 being fixedly connected with a pump cover 2 by using bolts and nuts, a sealing monitoring pipe 6 is welded above the pump body 11 on one side of the second-stage impeller 5, a shaft liner flushing pipe 10 is welded below the pump body 11 on one side of the first-stage impeller 4, a first drainage pipeline 12 and a second drainage pipeline 13 are respectively welded on the pump body 11 below the first-stage impeller 4 and the second-stage impeller 5, a driving side of the pump body 11 is connected with a driving end bearing component 7, a non-driving side of the pump body 11 is connected with a non-driving end bearing component 9, a bearing cooling chamber 15 is provided below the driving end bearing component 7, and a bearing fan 1 is provided inside the non-driving end bearing component 9.

[0016] Furthermore, an inlet 16 is provided below the first-stage impeller 4 , and an outlet 17 is provided below the second-stage impeller 5 .

[0017] Furthermore, the pump shaft 8 is connected to a driving device.

[0018] Furthermore, the first-stage impeller 4 and the second-stage impeller 5 adopt a split-case centrifugal pump structure.

[0019] Furthermore, the pump body 11, the shaft liner flushing pipe 10 and the sealing monitoring pipe 6 are all provided with a heat preservation structure.

[0020] Embodiment: When the device is in use, the driving device is connected to the pump shaft 8 to provide rotational energy to the pump shaft 8.

[0021] The first-stage impeller 4 and the second-stage impeller 5 are installed on the pump shaft 8. The pump shaft 8 transfers the energy of the external driving device to the first-stage impeller 4 and the second-stage impeller 5. The first-stage impeller 4 and the second-stage impeller 5 transfer energy to the pumped medium to increase the pressure energy of the medium.

[0022] The pumped medium enters the pump from the inlet 16, provides energy to the conveying medium through the first-stage impeller 4, enters the guide channel of the pump body 11, enters the second-stage impeller 5 through the guide channel, provides energy to the conveying medium through the sealed monitoring tube 6, enters the pump shaft 8 outlet channel, and finally conveys the medium out through the outlet 17.

[0023] The sealing monitoring tube 6 can lead the medium in the sealing cavity out, and monitor the pressure and temperature of the medium in the sealing cavity through the pressure and temperature detection instrument.

[0024] The shaft liner flushing pipe 10 flushes the pump shaft liner through an external flushing medium to prevent the medium from clogging at a small gap during operation.

[0025] A bearing cooling cavity 15 is provided at the drive-end bearing component 7 to exchange heat of the lubricating oil inside the bearing box through air cooling to ensure sufficient heat dissipation of the bearing.

[0026] A bearing fan 1 is provided at the non-drive end bearing component 9 to assist in heat dissipation of the bearing and ensure the operating temperature of the bearing.

[0027] The 2-stage split-case centrifugal pump for crude oil transportation is a 2-stage split-case centrifugal pump supported at both ends. The pump has a safe and reliable structure and is easy to maintain. It has low energy consumption and zero medium leakage, and is an energy-saving and environmentally friendly device.

[0028] The pump adopts a two-stage impeller to achieve high pump head and high outlet pressure.

[0029] The pump adopts a split-center structure, which allows quick replacement of the pump rotor without disassembling the pipeline, and quick and convenient maintenance. The pump rotor is fully dynamically balanced to reduce the risk of rotor vibration and enhance the stability of unit operation.

[0030] The sealing chamber is equipped with pressure monitoring to monitor the pressure inside the sealing chamber in real time, issue problem alarms, and adjust the pressure to ensure safe and stable operation of the seal.

[0031] Small clearance sleeve and bushing position setting media flushing reduces the risk of sleeve and bushing biting.

[0032] The whole unit is insulated, and the pump body, flushing pipeline, monitoring pipeline, and discharge pipeline are insulated to increase the medium temperature, appropriately reduce the medium viscosity, and make the medium transportation safer.

[0033] The bearing adopts two structures: large cavity air cooling and air cooling, which can effectively reduce the bearing temperature rise and ensure the stable operation of the bearing

[0034] Equipped with real-time bearing temperature monitoring instrument to detect bearing temperature at any time and improve the running stability of the unit

[0035] The unit is equipped with multi-point drainage. When the pump is stopped, the medium in the pump is completely drained to avoid residual viscous medium that causes the pump to be unable to start, thereby improving the operability of the pump.

[0036] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A two-stage split-case centrifugal pump for transporting high-pressure and high-viscosity crude oil, comprising a pump body (11) and a pump shaft (8), characterized in that: The pump shaft (8) is installed in the pump body (11), and the pump shaft (8) is fixedly installed with a first-stage impeller (4) and a second-stage impeller (5) in the pump body (11) by using a first shaft sleeve (3) and a second shaft sleeve (14), respectively. The pump body (11) is fixedly connected with a pump cover (2) by using bolts and nuts. A sealing monitoring pipe (6) is welded above the pump body (11) on one side of the second-stage impeller (5), and a shaft liner is welded below the pump body (11) on the side of the first-stage impeller (4). A flushing pipe (10), a first drainage pipeline (12) and a second drainage pipeline (13) are respectively welded on the pump body (11) below the first-stage impeller (4) and the second-stage impeller (5), the driving side of the pump body (11) is connected to a driving end bearing component (7), the non-driving side of the pump body (11) is connected to a non-driving end bearing component (9), a bearing cooling chamber (15) is provided below the driving end bearing component (7), and a bearing fan (1) is provided inside the non-driving end bearing component (9).

2. A two-stage split centrifugal pump for high-pressure and high-viscosity crude oil transportation according to claim 1, characterized in that: An inlet (16) is provided below the first-stage impeller (4), and an outlet (17) is provided below the second-stage impeller (5).

3. A two-stage split centrifugal pump for high-pressure and high-viscosity crude oil transportation according to claim 1, characterized in that: The pump shaft (8) is connected to a driving device.

4. A two-stage split centrifugal pump for high-pressure and high-viscosity crude oil transportation according to claim 1, characterized in that: The first-stage impeller (4) and the second-stage impeller (5) adopt a split-center centrifugal pump structure.

5. A two-stage split centrifugal pump for high-pressure and high-viscosity crude oil transportation according to claim 1, characterized in that: The pump body (11), the shaft liner flushing pipe (10) and the sealing monitoring pipe (6) are all provided with a heat insulation structure.

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