CN212407058U - Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode - Google Patents

Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode Download PDF

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Publication number
CN212407058U
CN212407058U CN202021678329.0U CN202021678329U CN212407058U CN 212407058 U CN212407058 U CN 212407058U CN 202021678329 U CN202021678329 U CN 202021678329U CN 212407058 U CN212407058 U CN 212407058U
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pump
centrifugal pump
suction
double
ultra
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CN202021678329.0U
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杨培生
陈洪运
韩慧星
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Shenyang Great Pump Co ltd
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Shenyang Great Pump Co ltd
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Abstract

An ultra-low cavitation horizontal centrifugal pump adopting a four-port suction mode relates to a centrifugal pump, which is provided with a motor, a diesel engine and a steam turbine driving device, wherein a pump shaft of the centrifugal pump is connected with the driving device through a coupling; the radial bearing body part and the thrust bearing body part of the centrifugal pump both adopt an oil slinger thin oil self-lubricating mode or an oil mist lubricating mode; the shaft ends at two sides of the centrifugal pump are sealed by mechanical seal; a throat bushing is arranged between the mechanical seals at the two ends of the centrifugal pump and the pump body; the centrifugal pump adopts two double-suction impellers, and angular contact ball bearings are arranged in the thrust bearing body part in pairs; a middle shaft sleeve and a middle bushing are arranged between the two double-suction impellers of the centrifugal pump. The centrifugal pump can effectively reduce the necessary cavitation allowance of the centrifugal pump and improve the cavitation resistance of the centrifugal pump; the utility model discloses the product specially adapted needs the occasion of ultralow cavitation surplus of petrochemical trade, does to be applied to the similar occasion of other trades.

Description

Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode
Technical Field
The utility model relates to a centrifugal pump especially relates to an adopt four mouthfuls of suction methods's ultralow cavitation horizontal centrifugal pump.
Background
In the petrochemical industry in China and the world, the horizontal centrifugal pump has a wide application range, and centrifugal pump products are needed to be adopted in feed pumps, reflux pumps, tower bottom pumps, circulating pumps, product pumps, supply pumps, flushing pumps and the like. In some special occasions, due to the limitation of the conditions of the device, enough device cavitation allowance can not be provided for the centrifugal pump, if a common centrifugal pump product is adopted, the necessary cavitation allowance of the centrifugal pump is close to the device cavitation allowance, so that a cavitation phenomenon is generated in the operation process of the centrifugal pump, the vibration and the noise of the centrifugal pump are aggravated, and the centrifugal pump is stopped due to faults in severe cases, so that the safe and stable operation of the device is influenced. To solve this problem, it is necessary to develop a centrifugal pump having an ultra-low necessary cavitation margin for this particular application.
Disclosure of Invention
An object of the utility model is to provide an adopt four mouthfuls of suction methods's ultralow cavitation horizontal centrifugal pump, this centrifugal pump have two double suction impellers and undertake the centrifugal pump suction simultaneously to make the centrifugal pump have four impeller sunction inlets simultaneously, can effectively reduce the must cavitation surplus of centrifugal pump, with the lower special occasion of reply device cavitation surplus, guarantee the operation of equipment safety and stability.
The utility model aims at realizing through the following technical scheme:
the ultra-low cavitation horizontal centrifugal pump adopts a four-port suction mode, and comprises a pump shaft, a radial bearing body part, a bracket, a mechanical seal, a left pump cover, a left locking shaft sleeve, a double-suction impeller, a pump body, a middle bushing, a middle shaft sleeve, a right locking shaft sleeve, a right pump cover, a thrust bearing body part, a throat bushing, an impeller seal ring and a shell seal ring; the centrifugal pump can be driven by a motor, a diesel engine, a steam turbine and other driving devices, and a pump shaft of the centrifugal pump is connected with the driving devices through a coupling; radial bearing body parts and thrust bearing body parts of the centrifugal pump can be lubricated by thin oil of an oil slinger and oil mist; the shaft ends at two sides of the centrifugal pump are sealed by mechanical seal; a throat bushing is arranged between the mechanical seals at the two ends of the centrifugal pump and the pump body, so that the flushing consumption of the mechanical seals can be reduced; the centrifugal pump adopts two double-suction impellers, axial force can be basically and completely balanced, and residual axial force can be borne by angular contact ball bearings arranged in pairs in a thrust bearing body component; a middle shaft sleeve and a middle bushing are arranged between the two double-suction impellers of the centrifugal pump.
The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode adopts two double-suction impellers as the suction impellers of the centrifugal pump, so that the centrifugal pump is provided with four impeller suction ports simultaneously, the flow velocity of fluid at the impeller suction ports is effectively reduced, and the necessary cavitation allowance of the centrifugal pump is effectively reduced.
The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode is characterized in that the pump body, the left pump cover and the right pump cover jointly form a suction volute chamber of the centrifugal pump, the suction volute chamber is provided with a flow guide partition, and fluid entering the centrifugal pump from the suction volute chamber can uniformly and stably flow into four impeller suction ports through the action of the flow guide partition.
The ultralow cavitation horizontal centrifugal pump adopting the four-port suction mode has the advantages that the discharge volute chamber of the pump body adopts the double volute chambers, the radial force generated when the double-suction impeller rotates can be effectively balanced, the flow guide separation tongue is arranged in the discharge volute chamber, and fluid in the centrifugal pump can uniformly and stably flow out of the pump body under the action of the flow guide separation tongue.
The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode is characterized in that the double-suction impellers are of completely symmetrical structures, and the sizes of the two double-suction impellers are completely consistent, so that the axial force can be effectively balanced, and the turbulence phenomenon of fluid in the centrifugal pump is reduced.
The impeller sealing ring and the shell sealing ring are respectively arranged on the double-suction impeller, the pump body, the left pump cover and the right pump cover through the riding seam screws to play a role in isolating a high-pressure area and a low-pressure area of fluid, and have small gaps, so that the flow of the fluid from the high-pressure area to the low-pressure area can be reduced.
The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode is characterized in that the double-suction impeller, the middle shaft sleeve, the left locking shaft sleeve and the right locking shaft sleeve are arranged on a pump shaft, and force and torque transmitted by the driving device are transmitted through keys.
The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode is characterized in that the pump body is connected with the left pump cover and the right pump cover together by adopting a stud and a nut, and a winding pad is arranged between a high-pressure area and a low-pressure area of the pump body to prevent fluid from flowing back from the high-pressure area to the low-pressure area.
The radial bearing body part and the thrust bearing body part are connected with the left pump cover and the right pump cover through brackets, studs and nuts, and jointly support the pump shaft.
The utility model has the advantages and effects that:
1. the utility model discloses a two double suction impellers simultaneously as the impeller that inhales of centrifugal pump, make the centrifugal pump have four impeller sunction inlets simultaneously, can effectively reduce the velocity of flow of fluid when getting into the impeller sunction inlet to obtain the must cavitation surplus of ultralow, promoted the anti cavitation performance of centrifugal pump, some specially adapted require harsh place to the cavitation surplus.
2. The utility model discloses an inhale the volute chamber, tell the volute chamber and all adopt water conservancy diversion formula symmetrical design, when making the even steady operation of fluid in the centrifugal pump, can effectively reduce produced axial force of fluid and radial force, reduce the impact force that the operation in-process fluid produced, promote the stability of centrifugal pump operation.
3. The utility model discloses a two double suction impellers, double suction impeller adopt the symmetry design, have good self-balancing nature, and two double suction impellers's size is also completely unanimous simultaneously for the centrifugal pump is whole also to have good self-balancing nature, reduces the bearing atress, prolongs the steady operation duration of centrifugal pump.
4. The utility model discloses a winding pad separates the inside fluid of centrifugal pump and outside atmosphere, applicable in the application occasion that high temperature, high pressure, corrosivity are stronger, the range of application of the centrifugal pump of expansion.
5. The utility model discloses the shaft end seal adopts mechanical seal, and it can adopt multiple sealed washing scheme to can adopt bi-polar face structure, have reliable operating stability, and the stable state, sealed leakage quantity is very little.
Drawings
Fig. 1 is the overall structure schematic diagram of the centrifugal pump of the utility model.
The components in the figure: the pump comprises a pump shaft 1, a radial bearing body component 2, a bracket 3, a mechanical seal 4, a left pump cover 5, a left locking shaft sleeve 6, a double-suction impeller 7, a pump body 8, a middle bushing 9, a middle shaft sleeve 10, a right locking shaft sleeve 11, a right pump cover 12, a thrust bearing body component 13, a throat bushing 14, an impeller seal ring 15 and a shell seal ring 16.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings.
The utility model discloses a four inhale the ultralow cavitation horizontal centrifugal pump of suction method, by pump shaft, journal bearing body part, bracket, mechanical seal, left pump cover, left locking axle sleeve, double suction impeller, the pump body, middle bush, right locking axle sleeve, right pump cover, footstep bearing body part, throat bush, impeller sealing ring, casing sealing ring etc. constitute.
The two double-suction impellers of the centrifugal pump are fixed on the pump shaft through the middle shaft sleeve, the left locking shaft sleeve and the right locking shaft sleeve, force and torque between the pump shaft and the double-suction impellers are transmitted through keys, and the double-suction impellers rotate at high speed along with the transmission shaft to apply work to fluid and output the fluid out of the pump body.
The centrifugal pump radial bearing body part and the thrust bearing body part jointly play a supporting role for the pump shaft to guarantee the stable operation of the centrifugal pump, wherein the radial bearing body part mainly bears radial force, and the thrust bearing body part bears radial force and axial force.
The space diversion partitions are designed in the suction volute chambers of the pump body, the left pump cover and the right pump cover of the centrifugal pump, so that the space diversion partitions have good guiding and shunting effects on fluid in the pump, the fluid can uniformly flow into the suction inlet of the double-suction impeller, the turbulence phenomenon generated in the flowing process can be reduced, the flowing stability of the fluid is enhanced, and the cavitation resistance of the centrifugal pump is further improved.
The space flow guide partition is designed in the discharge volute chamber of the pump body of the centrifugal pump, so that the space flow guide partition has a good guide effect on fluid in the pump, the fluid flowing out of the double-suction impeller is guided to uniformly flow into a discharge port of the pump, the turbulence phenomenon generated in the flowing process is reduced, and the flowing stability of the fluid is enhanced.
The radial bearing body parts and the thrust bearing body parts of the centrifugal pump are connected to the pump cover through a bracket and bear the force and the moment transmitted by the impeller through the pump shaft together with the pump body.
The radial bearing body parts and the thrust bearing body parts of the centrifugal pump can be self-lubricated by thin oil and also can be lubricated by oil mist, so that the bearing can be better ensured to run for a long time at a lower temperature, the lubricating property of the lubricating oil is kept, and the service life of the bearing is effectively prolonged.
The pump shaft of the centrifugal pump is connected with a driving device through a coupling, and the coupling adopts a flexible diaphragm coupling, so that the misalignment condition possibly caused by motor installation can be compensated to the maximum extent.
Example 1
As shown in fig. 1, the ultra-low cavitation horizontal centrifugal pump adopting the four-suction mode includes a pump shaft 1, a radial bearing body part 2, a bracket 3, a mechanical seal 4, a left pump cover 5, a left locking shaft sleeve 6, a double-suction impeller 7, a pump body 8, a middle bushing 9, a middle shaft sleeve 10, a right locking shaft sleeve 11, a right pump cover 12, a thrust bearing body part 13, a throat bushing 14, an impeller seal ring 15 and a casing seal ring 16.
The centrifugal pump adopts two double-suction impellers 7 as the suction impellers of the pump at the same time, so that the centrifugal pump has four impeller suction ports at the same time, the two double-suction impellers 7 are fixed on a pump shaft 1 through a middle shaft sleeve 10, a left locking shaft sleeve 6 and a right locking shaft sleeve 11 and rotate at high speed along with the pump shaft 1, two ends of the pump shaft 1 are provided with a radial bearing body part 2 and a thrust bearing body part 13 which jointly support the pump shaft 1, the radial bearing body part 2 and the thrust bearing body part 13 are connected to a left pump cover 5 and a right pump cover 12 through a bracket 3 and then connected to a pump body 8 to form a whole, a throat bush 14 is arranged on the left pump cover 5 and the right pump cover 12 and used for separating a sealing cavity and the inside of the pump body to control the sealing flushing flow, the double-suction impellers 7 are provided with impeller sealing rings 15, and the left pump cover 5, the impeller seal ring 15 and the casing seal ring 16 cooperate to separate the high pressure region and the low pressure region of the centrifugal pump and reduce the flow of fluid from the high pressure region to the low pressure region of the centrifugal pump.
The two double-suction impellers 7 can be simultaneously used as suction impellers of the centrifugal pump, so that the centrifugal pump is provided with four impeller suction ports simultaneously, the flow velocity of fluid flowing into the impellers is effectively reduced, the necessary cavitation allowance of the centrifugal pump is reduced, and the cavitation resistance of the centrifugal pump is improved.
The pump body 8, the left pump cover 5 and the right pump cover 12 are provided with space flow guide isolating tongues in the suction volute chamber, so that the space flow guide isolating tongues can have good guiding and shunting effects on fluid in the pump, ensure that the fluid uniformly flows into the suction inlet of the double-suction impeller, reduce the turbulence phenomenon generated in the flowing process, enhance the flowing stability of the fluid and further improve the cavitation resistance of the centrifugal pump.
The pump body 8 is provided with a space flow guide partition tongue in the discharge volute chamber, so that the pump body can have a good guide effect on fluid in the pump, guide the fluid flowing out of the double-suction impeller to uniformly flow into a discharge port of the pump, reduce a turbulent flow phenomenon generated in the flowing process and enhance the flowing stability of the fluid.
The left pump cover 5 and the right pump cover 12 are connected with the pump body 8 through studs and nuts, and winding pads are arranged between the high-pressure area and the low-pressure area so as to prevent fluid from flowing back from the high-pressure area to the low-pressure area and leaking out of the centrifugal pump.
The double-suction impeller 7 is fixed on the pump shaft 1 through a middle shaft sleeve 10, a left locking shaft sleeve 6 and a right locking shaft sleeve 11.
The pump shaft 1 is supported at both ends by the radial bearing body part 2 and the thrust bearing body part 13.
The radial bearing body component 2 and the thrust bearing body component 13 are connected to the bracket 3 through a stud and a nut.
And the bracket 3 is connected to the left pump cover 5 and the right pump cover 12 through a stud and a nut.
And a mechanical seal 4 for sealing between the rotary member and the stationary member to prevent fluid leakage.
The radial bearing body part 2 and the thrust bearing body part 13 bear radial force generated by shafting operation simultaneously, play a role in stabilizing the shafting operation, and simultaneously the bearing in the thrust bearing body part 13 can bear residual axial force.

Claims (9)

1. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode is characterized by comprising a pump shaft, a radial bearing body part, a bracket, a mechanical seal, a left pump cover, a left locking shaft sleeve, a double-suction impeller, a pump body, a middle bushing, a middle shaft sleeve, a right locking shaft sleeve, a right pump cover, a thrust bearing body part, a throat bushing, an impeller sealing ring and a shell sealing ring; the centrifugal pump is provided with a motor, a diesel engine and a steam turbine driving device, and a pump shaft of the centrifugal pump is connected with the driving device through a coupling; the radial bearing body part and the thrust bearing body part of the centrifugal pump both adopt an oil slinger thin oil self-lubricating mode or an oil mist lubricating mode; the shaft ends at two sides of the centrifugal pump are sealed by mechanical seal; a throat bushing is arranged between the mechanical seals at the two ends of the centrifugal pump and the pump body; the centrifugal pump adopts two double-suction impellers, and angular contact ball bearings are arranged in the thrust bearing body part in pairs; a middle shaft sleeve and a middle bushing are arranged between the two double-suction impellers of the centrifugal pump.
2. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction manner as claimed in claim 1, characterized in that the centrifugal pump adopts two double suction impellers (7) as the suction impellers of the centrifugal pump at the same time, so that the centrifugal pump has four impeller suction ports at the same time.
3. The ultra-low cavitation horizontal centrifugal pump adopting the four port suction manner as claimed in claim 2, characterized in that the double suction impellers are both of a symmetrical structure, and the two double suction impellers are identical in size.
4. The ultra-low cavitation horizontal centrifugal pump adopting the four port suction manner as claimed in claim 3, characterized in that the double suction impeller, the middle shaft sleeve, the left locking shaft sleeve and the right locking shaft sleeve are mounted on the pump shaft.
5. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction mode as claimed in claim 1, characterized in that the pump body (8), the left pump cover (5) and the right pump cover (12) of the centrifugal pump jointly form a suction volute of the centrifugal pump, and a space flow guide separation tongue is designed in the suction volute.
6. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction manner as claimed in claim 1, characterized in that a discharge volute chamber of a pump body (8) of the centrifugal pump adopts a double volute chamber, and a flow guide separation tongue is arranged in the discharge volute chamber.
7. The ultra-low cavitation horizontal centrifugal pump adopting the four port suction manner as claimed in claim 1, wherein the impeller seal ring and the casing seal ring are respectively mounted on the double suction impeller, the pump body, the left pump cover and the right pump cover through a straddle screw.
8. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction manner as claimed in claim 7, characterized in that the pump body is connected with the left pump cover and the right pump cover by adopting a stud and a nut, and a winding pad is arranged between the high pressure area and the low pressure area.
9. The ultra-low cavitation horizontal centrifugal pump adopting the four-port suction manner as claimed in claim 1, wherein the radial bearing body part and the thrust bearing body part are connected with the left pump cover and the right pump cover through brackets, studs and nuts, and jointly support the pump shaft.
CN202021678329.0U 2020-08-13 2020-08-13 Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode Active CN212407058U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021678329.0U CN212407058U (en) 2020-08-13 2020-08-13 Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021678329.0U CN212407058U (en) 2020-08-13 2020-08-13 Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode

Publications (1)

Publication Number Publication Date
CN212407058U true CN212407058U (en) 2021-01-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021678329.0U Active CN212407058U (en) 2020-08-13 2020-08-13 Ultra-low cavitation horizontal centrifugal pump adopting four-port suction mode

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CN (1) CN212407058U (en)

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