CN204610292U - A kind of pipeline conveying centrifugal pump - Google Patents

Abstract

A centrifugal pump for pipeline transportation. Compared with other centrifugal pumps, the overall structure adopts a horizontal split horizontal centrifugal pump structure. It has reasonable structure, excellent performance, high operating efficiency and convenient maintenance. The pump cover and pump body are connected by bolts. They are jointed together to form a volute structure with symmetrical top and flow passages, which can minimize the radial force generated by the pump during operation. The main shaft traverses the pump cover and the pump body. The suction port and the discharge port are located below the axis line of the pump and distributed on both sides of the pump body. It is not necessary to disassemble the inlet and outlet pipelines and the motor to open the cover to check the internal parts of the pump. Easy maintenance and operation. The pump body feet are close to the center support, which can reduce misalignment problems caused by deformation caused by temperature differences. This series of pumps not only has the advantages of good stability, high reliability, suitable for conveying media containing solid particles, and convenient maintenance, but also is more advanced and reliable in terms of structure and service life.

Description

Centrifugal pump for pipeline transportation

Technical field:

The utility model relates to a pump body, in particular to a centrifugal pump for pipeline transportation.

Background technique:

The development of my country's petrochemical industry will require a variety of equipment, and these equipment, especially important equipment, cannot all rely on imports, because if they all rely on imports, development will be controlled by others. Only by strengthening the localization of major equipment and gradually shortening the gap with foreign advanced technology can we grasp the active competitiveness in international competition and promote the development of my country's petrochemical industry.

From the current situation, my country's pump manufacturing enterprises have the ability of technological innovation. Starting from enhancing the innovation ability of enterprises, it is completely possible to realize the research and development of large-scale oil pipeline pumps through introduction, digestion, absorption and re-innovation. Carry out independent design and development of oil pipeline pump products, make breakthroughs in the design and manufacturing technology of oil pipeline pumps, achieve the goal of localization, and replace imported products. This will not only improve the ability and level of continuous innovation of the enterprise, but also cultivate emerging industry.

Utility model content:

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a centrifugal pump for pipeline transportation.

The technical problems to be solved by the utility model are realized by the following technical solutions.

A centrifugal pump for pipeline transportation, including a shaft, the shaft traverses the pump cover and the pump body, and an impeller is installed in the middle of the shaft. The impeller has high efficiency and low NPSH, closed double suction structure, and self-balancing axial force. The internal flow is very complicated. In order to optimize the hydraulic performance of the pump and shorten the design time, we use the method of combining theoretical calculation and CFD technology to modify the hydraulic part, which can well predict the performance of the fluid machinery and the vortex generated by the internal flow. Secondary flow, boundary layer separation, wake flow, blade vibration and other adverse phenomena, the efficiency is increased by 2 points compared with the same type of pump. The guide vane parts are installed outside the impeller. The design of the guide vane parts takes into account that the design of the suction chamber requires an inlet pressure of 10 MPa, and the pump head is large. The guide vanes are used to convert the kinetic energy of the high-speed moving medium into pressure potential energy, balance the radial force, reduce vibration, and ensure Reliable operation; the guide vane is installed on the inner seam of the pump body and pump cover. The shell structure of the pump body is divided axially and horizontally. It is not necessary to disassemble the inlet and outlet pipelines and motor of the pump. Open the pump cover to check all the parts in the pump, which is very convenient for maintenance; the oil delivery pump adopts a single volute design, and the structure is reliable. , Easy maintenance; High pressure resistant design ensures reliable operation of the equipment, up to 15MPa inlet pressure requirements; Adjusting sleeves are installed on the left and right sides of the impeller to position the impeller. The mechanical seal is installed in the two sealing chambers formed after the pump body and the pump cover are closed. A throttling sleeve is installed in the front of the sealing chamber to reduce the pressure of the sealing chamber and improve the life of the mechanical seal. Both ends of the pump are equipped with driving end bearing parts and non-driving end bearing parts. These two bearing parts are self-lubricating bearing parts. Due to factors such as no water source in the environment and remote location of the pump. In the design, the high-power self-lubricating bearing body is considered, and no cooling water is provided. The temperature rise of the bearing itself and the heat transfer of the lubricating oil all need to be dissipated by the bearing body itself. The bearing body on the driving side of the oil pump is designed according to a large oil pool, and the bearing body on the non-driving side is designed with cooling fins. There is a pre-assembled thrust bearing body in front of the non-drive end bearing. The bearing body is equipped with two parallel angular contact thrust ball bearings, which are mainly used to bear the axial force and control the axial movement. Radial cooling fins are cast outside the bearing body for natural cooling.

For pressureless and non-circulating lubrication systems, an automatic oil cup with visual liquid level indication must be equipped, and the oil filling cup should be able to be completely emptied without any leakage during oil filling. Equipped with detachable oil sight window, with waterproof and dustproof breathing cover. Both the driving side and the non-driving side bearing structure of the oil pipeline centrifugal pump adopt the rolling bearing structure, and a group of thrust rolling bearings and a rolling bearing are distributed on the non-driving side. The overall structure adopts a split structure, the assembled rotor can be directly put into the pump body, cover the pump cover and install the installed bearing body parts, and then the assembly can be completed; so that the pump cover can be opened and the bearing body parts removed during installation and disassembly. The whole rotor can be taken out; it is easy to maintain, low in energy consumption, stable and reliable, and cheap in price.

The beneficial effects of the utility model are:

1. Skillfully use the volute and guide vane structure to convert the kinetic energy of the medium into pressure potential energy, balance the radial force, reduce vibration, and ensure reliable operation;

2. Rigid shell design, strong pressure bearing capacity and high reliability. The horizontal split volute structure is adopted, supported at both ends, the distance between the support points is short, the pump runs stably, and the vibration noise is low. The suction and discharge pipelines are located in the lower part of the pump body, which makes the layout of the pipelines simple, convenient and beautiful. It is not necessary to disassemble the pipelines and pipeline systems to check the wear of the wearing parts and replace the rotor parts.

3. The impeller adopts excellent hydraulic model, high efficiency and low NPSH, closed double suction structure, which can well balance the huge axial force, and effectively solve the problem that the axial force affects the quality of centrifugal pumps at present. Both ends are fixed on the shaft with bushing nuts, and the bushing nuts are equipped with anti-loosening structure, and the impeller adopts single-stage double-suction structure. The guide vane is used to convert the high-speed kinetic energy of the medium into pressure potential energy and balance the radial force.

4. The mouth ring of the pump body with steps is installed on the pump, which is convenient for assembly and disassembly.

5. The modular mechanical seal is installed in the sealing cavity as a whole, which makes the disassembly and disassembly of the sealing unit quick and easy during maintenance or repair. The design of the cartridge type balanced mechanical seal makes the operation more stable and reliable. The sealing chamber complies with the API682 standard and can be equipped with various types of mechanical seals.

6. The bearing box is lubricated with thin oil, which improves the working conditions of the bearing and prolongs the life of the bearing. The bearings are imported with original packaging, and the thrust bearing is designed to withstand residual axial force. The safe and reliable bearing isolator can effectively prevent the leakage of lubricating oil and prevent impurities such as dust and sewage from entering the bearing box, ensuring that the lubricating oil is clean and pollution-free, and it is safe for the bearing to run Create a good working environment.

7. The conical shaft extension is designed to facilitate the disassembly and assembly of couplings, bearings and seals, reducing maintenance time.

Description of drawings:

Fig. 1 is the structural representation of the utility model;

1——Non-drive end bearing component, 2—Shaft, 3—Mechanical seal, 4—Pump cover, 5—Adjustment sleeve, 6—Throttle sleeve, 9—Guide vane parts, 10—Impeller , 11——pump body, 12——drive end bearing components.

Detailed ways:

In order to make the technical means, creative features, goals and effects achieved by the utility model easy to understand, the utility model will be further elaborated below in conjunction with specific illustrations.

As shown in Figure 1, a centrifugal pump for pipeline transportation includes a shaft 2, which traverses the pump cover 4 and the pump body 11, and an impeller 10 is installed in the middle of the shaft. The impeller has high efficiency, low NPSH, and a closed double-suction structure. , self-balancing axial force, because the internal flow of the pump is very complex, in order to optimize the hydraulic performance of the pump and shorten the design time, we use the method of combining theoretical calculation and CFD technology to modify the hydraulic part, which can well predict the fluid machinery Performance and adverse phenomena such as vortex, secondary flow, boundary layer separation, wake flow, blade vibration and other adverse phenomena generated by internal flow, the efficiency is improved by 2 points compared with the same type of pump. The guide vane part 9 is installed on the outside of the impeller. The design of the guide vane part considers that the suction chamber design requires an inlet pressure of 10 MPa, and the pump head is large. The guide vane is used to convert the kinetic energy of the high-speed moving medium into pressure potential energy, balance the radial force, and reduce vibration. , to ensure reliable operation; the guide vane is installed on the inner seam of the pump body and pump cover. The shell structure of the pump body is divided axially and horizontally. It is not necessary to disassemble the inlet and outlet pipelines and motor of the pump. Open the pump cover to check all the parts in the pump, which is very convenient for maintenance; the oil delivery pump adopts a single volute design, and the structure is reliable. , Easy maintenance; high pressure resistant design to ensure reliable operation of the equipment, the highest can meet the requirements of 15MPa inlet pressure; the left and right sides of the impeller are equipped with adjustment sleeves 5 to position the impeller. The mechanical seal 3 is installed in the two sealing chambers formed after the pump body and the pump cover are closed, and a throttling sleeve 6 is installed in the front section of the sealing chamber to reduce the pressure of the sealing chamber and improve the life of the mechanical seal. Both ends of the pump are equipped with a driving end bearing part 12 and a non-driving end bearing part 1. These two bearing parts are self-lubricating bearing parts. In the design, the high-power self-lubricating bearing body is considered, and no cooling water is provided. The temperature rise of the bearing itself and the heat transfer of the lubricating oil all need to be dissipated by the bearing body itself. The bearing body on the driving side of the oil pump is designed according to a large oil pool, and the bearing body on the non-driving side is designed with cooling fins. There is a pre-assembled thrust bearing body in front of the non-drive end bearing. The bearing body is equipped with two parallel angular contact thrust ball bearings, which are mainly used to bear the axial force and control the axial movement. Radial cooling fins are cast outside the bearing body for natural cooling.

For pressureless and non-circulating lubrication systems, an automatic oil cup with visual liquid level indication must be equipped, and the oil filling cup should be able to be completely emptied without any leakage during oil filling. Equipped with detachable oil sight window, with waterproof and dustproof breathing cover. Both the driving side and the non-driving side bearing structure of the oil pipeline centrifugal pump adopt the rolling bearing structure, and a group of thrust rolling bearings and a rolling bearing are distributed on the non-driving side. The overall structure adopts a split structure, the assembled rotor can be directly put into the pump body, cover the pump cover and install the installed bearing body parts, and then the assembly can be completed; so that the pump cover can be opened and the bearing body parts removed during installation and disassembly. The whole rotor can be taken out; it is easy to maintain, low in energy consumption, stable and reliable, and cheap in price.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (6)

1. a pipeline conveying centrifugal pump, it is characterized in that: comprise axle, axle traverses in the middle of pump cover, the pump housing, in the middle of axle, impeller is installed, impeller outside is provided with stator parts, and stator is arranged on the pump housing, pump cover inner stopper, and the impeller left and right sides is provided with adjusting sleeve to locate impeller, in two Seal cages formed after mechanical seal is arranged on the pump housing, pump cover closes, pump housing two ends are provided with drive end bearing parts and non-driven-end bearing parts.

2., according to a kind of pipeline conveying centrifugal pump described in claim 1, it is characterized in that: described pump housing shell mechanism adopts axial horizonally split.

3., according to a kind of pipeline conveying centrifugal pump described in claim 1, it is characterized in that: described Seal cage leading portion is provided with orifice sleeve.

4. according to a kind of pipeline conveying centrifugal pump described in claim 1, it is characterized in that: described drive end bearing parts and non-driven-end bearing parts are all self oiling bearing parts.

5., according to a kind of pipeline conveying centrifugal pump described in claim 1, it is characterized in that: outside described non-drive side bearing support, be designed with radiating fin.

6. according to a kind of pipeline conveying centrifugal pump described in claim 1, it is characterized in that: before described non-driven-end bearing, be furnished with a thrust-bearing body that can assemble in advance, bearing support, built with two angle contacting thrust ball bearings arranged side by side, is cast with radial radiating fin outside bearing support.