CN109654024B - Double-shell axial split type ultrahigh pressure coke cutting water pump - Google Patents
Double-shell axial split type ultrahigh pressure coke cutting water pump Download PDFInfo
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- CN109654024B CN109654024B CN201910079532.1A CN201910079532A CN109654024B CN 109654024 B CN109654024 B CN 109654024B CN 201910079532 A CN201910079532 A CN 201910079532A CN 109654024 B CN109654024 B CN 109654024B
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- inner shell
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000005520 cutting process Methods 0.000 title claims abstract description 11
- 239000000571 coke Substances 0.000 title description 5
- 230000007704 transition Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 34
- 210000002105 tongue Anatomy 0.000 claims description 6
- 238000005235 decoking Methods 0.000 claims 1
- 230000009977 dual effect Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 8
- 238000005266 casting Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 16
- 230000007246 mechanism Effects 0.000 description 8
- 238000004804 winding Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004939 coking Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/08—Multi-stage pumps the stages being situated concentrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/185—Rotors consisting of a plurality of wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The double-shell axial split type ultrahigh pressure coke-cutting water pump comprises a pump cylinder body (4), an inner shell (5), a pump suction chamber (6), a rotating shaft (7) and impellers at all levels, wherein the inner shell (5) is formed by an upper shell (51) and a lower shell (52) in an axial split mode, and a plurality of discharge flow passages (54) and impeller suction chambers (53) which are arranged at intervals are arranged in the inner shell; the front impeller set formed by the first-stage impeller and the secondary impeller, the rear impeller set formed by the last-stage impeller and the secondary impeller are symmetrically arranged in opposite directions, and a middle transition flow passage (55) is arranged in the inner shell and at the side edges of the last secondary impeller of the front impeller set and the rear impeller set. The axial force generated by the impeller can be balanced by itself, no balance leakage exists, the pump efficiency is improved, the ultrahigh pressure is generated, the casting of the upper shell and the lower shell is convenient, the installation and the maintenance are convenient, the operation is stable and reliable, and the energy-saving effect is remarkable.
Description
Technical Field
The invention relates to a multistage centrifugal pump, in particular to a double-shell multistage centrifugal coke-cutting water pump with an inner shell axially split and symmetrically arranged.
Background
The currently commonly used multistage centrifugal pump has three structures of double-shell radial split type (BB 5 for short), single-shell radial split type (BB 4 for short) and single-shell axial split type (BB 3 for short).
The double-shell type multistage centrifugal pump (BB 5) adopts radial split guide vanes, and a pump core rotor and an impeller of the double-shell type multistage centrifugal pump adopt double-shell ultrahigh-pressure multistage centrifugal pumps which are arranged in a unidirectional series manner. The axial force balance mechanism and the thrust bearing component are required to be arranged for balancing and bearing, and the axial force balance mechanism has high design, processing and assembly precision, high maintenance technical level and troublesome maintenance; in addition, due to frequent start and change of the operation condition or due to operation and other reasons, the grinding phenomenon of the axial force balancing mechanism and the thrust bearing often occurs, and unsafe hidden danger exists.
The single-shell type multistage centrifugal pump (BB 4) has the same unsafe hidden trouble as the double-shell type multistage centrifugal pump; there is also a need to assemble and disassemble the suction and discharge pipelines when assembling and disassembling the pump parts, and the use and maintenance are more troublesome. Because the segmental centrifugal pump is provided with the segmental multistage guide vane and the middle section matched structure, the manufacturing precision of each component is high, and the machining is difficult; during assembly, dynamic and static errors generated by a plurality of fit clearances between the sectional type multi-stage guide vane and the middle section are difficult to eliminate, and the integral structural rigidity of the pump core and the reliability of the unit are affected; particularly, when the pump is assembled and disassembled and overhauled, the impeller, the guide vane, the middle section and the like in the pump core are disassembled step by step, so that the overhauling can be performed. Therefore, the accuracy of dynamic balance of the original rotor is lost, the maintenance cost is high, the maintenance time is long, and the operation economic benefit is influenced.
The single-shell axial split type multistage centrifugal pump (BB 3) is not used for coking systems, and the use pressure is generally in the occasion of the sub-high pressure (about 10 MPa) because of the limitation of international standard use conditions and the limitation of domestic manufacturing level, so that the use requirement of the ultra-high pressure is far from being met.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides the double-shell axial split type ultrahigh pressure coke cutting water pump which is simple and convenient to overhaul, low in failure rate, efficient and energy-saving, so as to meet the coke cutting requirements of petroleum refining and coal chemical coking systems.
The aim of the invention is realized by the following technical scheme: the double-shell axial split type ultrahigh pressure coke-cutting water pump comprises a pump end cover, a pump cylinder body, an inner shell, a pump suction chamber, a rotating shaft, a first-stage impeller, a secondary impeller, a final-stage impeller, a mechanical sealing component and a bearing component, wherein the inner shell is formed by an upper shell and a lower shell in an axial split mode, a plurality of discharge flow passages and impeller suction chambers are arranged in the inner shell at intervals, and the discharge flow passages are symmetrical space flow passages of the double scroll chambers and are communicated with the impeller suction chambers; the front impeller set formed by the first-stage impeller and the secondary impeller, the rear impeller set formed by the last-stage impeller and the secondary impeller are symmetrically arranged in opposite directions, and a middle transition flow passage is arranged in the inner shell and at the side edges of the last secondary impeller of the front impeller set and the rear impeller set.
The pump suction chamber is arranged independently and is arranged at the suction ends of the upper shell and the lower shell through a suction chamber stud and a suction chamber nut, and the front end of the pump suction chamber is provided with a positioning pin and is connected with the suction box body. And a balance cavity is formed among the pump end cover, the inner shell and the mechanical sealing component of the discharge end, a balance channel communicated with the balance cavity is arranged in the pump end cover, a balance pipe connected with the balance channel is externally connected onto the pump end cover, and the other end of the balance pipe is connected with a suction inlet of the pump cylinder body.
Impeller hub sealing rings are respectively arranged among the primary impeller, the secondary impeller and the inner shell, and pump body sealing ring seats are sleeved on the side edges of the impeller hub sealing rings. Two sides of the inner throat part of the pump body sealing ring seat are provided with separating tongues which are positioned in the impeller suction chamber.
The technical scheme adopted by the invention has the beneficial effects that:
1. The multistage impellers are symmetrically arranged back to back, and the axial force generated by each impeller is self-balanced; the axial force balance mechanism is not needed, balance leakage is avoided, the efficiency of the pump is improved, and the possible failure point of the balance mechanism is reduced. The radial forces of the inner housing are balanced completely due to the exact same shape of the upper and lower housing.
2. The pump suction chamber is manufactured by a single design and is combined with the suction ends of the upper and lower shells (in the shape of a volute), so that the structure of the inner shell can be simplified. The upper shell and the lower shell have the same shape, so that the upper shell and the lower shell are convenient to cast; the pump suction chamber will close to the end of the inner housing also results in a higher degree of upper and lower housing engagement, with more effective sealing of the open face.
3. The inner shell (pump core) is of a horizontal middle-opening structure, and when the pump is overhauled, the whole rotor component can be pulled out for overhauling only by disassembling a plurality of shell bolts on the upper shell of the inner shell. After the rotor component is integrally assembled and subjected to high-speed dynamic balance, parts on the rotor component do not need to be disassembled, the rotor component can be directly placed in the lower shell, and the upper shell is assembled, so that the dynamic balance precision is ensured, and the time is saved and the reliability is ensured.
4. The volute type inner shell structure is a space runner, and no guide vane is adopted, so that the efficient area of the pump is wide, and the energy-saving effect is remarkable. The sensitivity of the volute type pump impeller discharge to the deviation of the volute center is reduced, and the stable operation of the pump is facilitated. The volute type pump allows a larger diversion angle clearance, so that pressure pulsation is reduced when the pump operates at an off-design flow, and the operation is stable and reliable.
Along with the improvement of manufacturing level and capability in the mechanical casting industry, the invention is popular and recommended by customers in industries such as refining, electric power, metallurgy and the like from the use angle, and the inner shell is a double-shell multi-stage ultrahigh pressure centrifugal pump (BB5+) with a horizontally split volute structure in which impellers are symmetrically (back-to-back) arranged. Is more suitable for high-pressure occasions such as a coke cutting water pump of a coking device, a high-pressure liquid ammonia pump of a urea production device, a water supply pump of a large-sized high-pressure boiler in the electric power industry, high-pressure dephosphorization and the like.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and embodiments.
Fig. 1 is a schematic view of the structure of the present invention (an impeller is exemplified by eight stages).
Fig. 2 is a view in the direction a of fig. 1.
Fig. 3 is a schematic view of the pump suction chamber (separately provided) of fig. 1.
Fig. 4 is a schematic structural view of the pump body seal ring seat (provided with a partition tongue) in fig. 1.
Detailed Description
Referring to fig. 1 to 3, the dual-casing axial split ultra-high pressure coke-cutting water pump (pmax=40 MPa) of the present invention comprises a pump end cover 1 (and a main gasket 2, a seal winding gasket 3, a main stud 15, a main nut 16, and a main gasket 17), a pump cylinder 4, an inner casing 5 (i.e., a pump core), a pump suction chamber 6, a rotating shaft 7, a first-stage impeller 8, a secondary impeller 9 (several stages), a final-stage impeller 10, a mechanical seal member (including a discharge-end mechanical seal member 13 and a suction-end mechanical seal member 18), a bearing member (including a discharge-end bearing member 14 and a suction-end bearing member 19), and a middle bushing 11, a middle bushing 23, a throttle bushing 12, a throttle bushing 26, etc., wherein the rotating shaft 7, the first-stage impeller 8, the secondary impeller 9, and the final-stage impeller 10 form a rotor member, and the inner casing 5 is formed by an upper casing 51 and a lower casing 52 (which are combined to form a cylindrical inner casing) in an axial split (horizontal split) manner, and the inner casing 5 has a plurality of through-flow passages 54 (a discharge-liquid discharge chamber 53 and a suction-end impeller chamber 53 are symmetrically arranged in the inner casing 5 and a discharge flow passage 53; the front impeller set (front four-stage impeller) formed by the first-stage impeller and the second-stage impeller and the rear impeller set (rear four-stage impeller) formed by the last-stage impeller and the second-stage impeller are symmetrically arranged in opposite directions (namely in a back-to-back mode and longitudinally), and a middle transition flow passage 55 is arranged in the inner shell 5 and at the side edges of the last secondary impeller of the front impeller set and the rear impeller set. The pump suction chamber 6 is provided separately and is attached to suction ends of the upper and lower cases 51, 52 by a suction chamber stud 30, a suction chamber nut 31, and a positioning pin 32 is attached to a suction box 38 at a front end of the pump suction chamber 6.
The invention is characterized in that a flat key 22 is arranged in a groove of a rotating shaft 7, an intermediate shaft sleeve 23 is slidably arranged on the rotating shaft 7, the flat key 22 and a clamping ring 24 are arranged in the groove of the rotating shaft 7, a first-stage impeller 8, a plurality of secondary impellers 9 and a last-stage impeller 10 are sequentially arranged on the rotating shaft 7 in a heating way, the flat key 22 is tightly matched with the flat key, an intermediate bushing 11 is sleeved at the intermediate shaft sleeve 23 and the hubs of two intermediate secondary impellers (the last secondary impeller of a front impeller group and the first secondary impeller of a rear impeller group), impeller hub sealing rings 45 are respectively arranged between the first-stage impeller 8, the secondary impellers 9 and an inner shell 5, and pump body sealing ring seats 25 (outside impeller suction chambers) are sleeved at the side edges of the impeller hub sealing rings 45. The secondary impeller and impeller hub sealing rings are mounted step by the same method until all impellers (except the final stage impeller) are mounted and corresponding impeller hub sealing rings are sleeved. The flat key on each impeller transmits the rotation moment on the rotating shaft to each impeller, and the snap ring 24 prevents each impeller from moving in an axial direction. A throttle sleeve 26 is arranged between the other end of the inner shell and the rotating shaft, and a throttle bushing 12 is sleeved outside the throttle sleeve.
Because the impellers are symmetrically arranged back to back on the rotating shaft, the axial force of the pump can be balanced by itself, and an axial force balancing mechanism is not required to be arranged on the rotor component, so that the possible faults caused by the extremely small end surface gap of the component provided with the balancing mechanism can be avoided; and meanwhile, balance leakage caused by the balance mechanism is avoided, so that the volumetric efficiency of the pump is improved. The upper and lower shells of the inner shell are matched planes of two half shells, which are in metal-to-metal surface contact, are positioned by a shell taper pin 29, and are sealed under the combined action of the tightening force and the high-pressure liquid pressure of the annular chamber in the pump cylinder 4 by a shell stud 27 and a shell nut 28.
After the assembled rotor component is qualified in dynamic balance, related parts assembled on the rotor component can be directly placed into the prepared lower shell without disassembling, so that the dynamic balance precision is ensured, and the time is saved and the reliability is ensured. Checking that the rotor part is easy to be unbuckled when rotating on the upper shell of the inner shell 5, then closing the other half of the upper shell, combining the split planes of the two half shells, tightly fastening the whole inner shell 5 to the required fastening force by using the shell stud 27 and the shell nut 28, and drilling a conical hole for positioning to punch a shell conical pin 29 after the rotor part is easy to be unbuckled when rotating; the pump suction chamber 6 is arranged at the suction end of the upper and lower shells (pump core), and is tightly clamped by a suction stud 30 and a suction nut 31 to form the whole of the pump core flow-through component; the independent arrangement of the pump suction chamber 6 can simplify the structure of the upper and lower shells, and can also strengthen the fastness of the upper and lower shells and the tightness of the middle open surface; because the front end of the pump suction chamber 6 is provided with the positioning pin 32, the suction end of the inner shell is provided with the winding pad 33 and the shell O-shaped ring 34, the assembled inner shell is arranged in the pump cylinder 4, the seam allowance positions are precisely matched, the water inlet of the pump suction chamber is aligned with the suction inlet of the pump cylinder, the main sealing pad 2 and the sealing winding pad 3 at the front end of the pump end cover 1 are arranged, the inner shell provided with the rotor component and the pump suction chamber are arranged in the pump cylinder 4 together, the seam allowance positions are precisely matched, the sealing winding pad 3 is matched with the seam allowance of the inner shell, and meanwhile, the main sealing pad 2 on the pump end cover 1 is matched with the seam allowance of the pump cylinder 4. The main bolt 15, the main nut 16 and the main washer 17 compress the pump end cover 1 and the pump cylinder 4 to achieve the required fastening force. The sealing winding pad 3 and the main sealing pad 2 can play a sealing role so as to prevent the leakage of high-pressure liquid in the pump body. The sealing winding pad 3 plays a role in preventing liquid leakage and simultaneously plays a role in compensating expansion and contraction of the inner shell caused by temperature difference. The discharge end mechanical seal member 13 is attached to the rotary shaft 7 and is engaged with the pump head 1, and is fastened by a discharge seal stud 34 and a discharge seal nut 35. The discharge end bearing member 14 is attached to the rotary shaft 7 and engaged with the discharge end mechanical seal member, and is fastened by a discharge bearing stud 36 and a discharge bearing nut 37. The suction box 38 is fitted with a suction "O" ring 39, which is secured to the pump cylinder 4 by a suction stud 40 and a suction nut 41, with the dowel holes aligned in the pump suction chamber 6 and dowel pins 32, to protect the inner housing (pump core) components from liquid impact and possible mechanical component induced torsional forces. The suction side mechanical seal member 18 and the suction side bearing member 19 support the weight of all the rotor members and are rotatable, and the discharge side mechanical seal member seals the liquid to prevent the liquid from leaking out axially. A balance cavity 56 is formed among the pump end cover 1, the inner shell 5 and the discharge end mechanical sealing component 13, a balance channel 57 communicated with the balance cavity 56 is arranged in the pump end cover 1, a balance pipe 58 connected with the balance channel 57 is externally connected to the pump end cover 1, and the other end of the balance pipe 58 is connected with the suction inlet of the pump cylinder 4.
Each impeller of the rotor component is positioned in the horizontally split inner shell, and the volute chamber is designed to be double-volute and is oppositely and symmetrically arranged, so that radial force generated by each impeller in the pump can be automatically balanced; the volute type water pump is designed and manufactured with a larger diversion angle clearance, so that instability and pressure pulsation reduction of the pump when the pump operates under a non-designed flow working condition are improved. As shown in fig. 4, at both sides of the inner throat of the pump body seal ring seat 25, there are provided partition tongues 44 (symmetrically arranged), and the partition tongues 44 are located in the impeller suction chamber 53, so that erosion of high-pressure liquid can be reduced and the influence of abrasion damage can be lessened. The inner shell is a space runner and is provided without guide vanes, so that the high-efficiency area of the pump is widened, and the energy-saving effect is remarkable; the sensitivity of the center of the pump impeller to the offset of the center of the cross section of the volute flow channel is lower, so that the pump can run more stably; the middle bushing 11 and the throttling bushing 12 are respectively provided with reverse spiral grooves so as to reduce interstage leakage and improve the volumetric efficiency of the pump.
During pump maintenance, the suction end bearing member 19, the suction end mechanical seal member 18 and the suction box 28 are together drawn out of the pump cylinder 4, and the pump suction chamber 6, the suction stud 30 and the suction nut 31 are removed; the shell stud 27, the shell nut 28 and the cone pin 29 are detached from the upper shell and the lower shell, the inner shell 5 can be separated from the middle opening, the impellers of the rotor component, the impeller hub sealing rings, the pump body sealing ring seat, the middle bushing, the throttling bushing (namely the pressure relief bushing), the inner shell and the like are overhauled, the impellers of all stages are not required to be detached step by step, the original dynamic balance precision of the rotor is not damaged, after overhauling, the rotor component is arranged in the inner shell 5, the impeller hub sealing rings, the pump body sealing ring seat and the pump body bushing are returned to the original positions, the upper shell is aligned with the other half of the volute, the cone pin 29 is arranged, and the shell stud 27 and the shell nut 28 are used for tightening to achieve fastening force; the pump suction chamber 6 is installed, the suction stud 30 and the suction nut 31 are used for tightening, the assembled inner shell 5 and the pump end cover 1 are installed in the pump cylinder 4, the water suction port of the pump suction chamber 6 is aligned with the suction port of the pump cylinder, and the suction pipe is aligned. The main nut 16 and the main washer 17 are used for tightening the pump end cover 1 and the pump cylinder body 4 to achieve the fastening force, so that the main sealing gasket 2 and the sealing winding gasket 3 both play a sealing role. The suction end suction box 38 is fastened to the end face of the pump cylinder 4, and the suction end mechanical seal member 18 and the suction end bearing member 19 are attached, and fastened by the bearing stud 42 and the bearing nut 43. When the rotor component rotates, the rotor component rotates easily and flexibly. Therefore, the time can be greatly shortened during maintenance, the original precision is not lost, and the use of customers is facilitated.
The working principle of the ultra-high pressure coke-cutting water pump is as follows: the hydraulic components of the upper and lower housings are identical and the castings of the upper and lower housings are identical. The liquid to be conveyed enters the suction inlet and the pump suction chamber of the pump cylinder body at a given pressure, and as the impellers (the first-stage impeller 8, the second-stage impeller 9 and the last-stage impeller 10) rotate, energy is transferred to the liquid to be conveyed, so that the kinetic energy and potential energy of the liquid are increased, and part of the kinetic energy is converted into potential energy in the spiral double-flow-channel volute chamber of the inner shell body. In the inner casing, each discharge flow channel guides the liquid to the impeller suction chamber of the impeller at the next stage, and the process is repeated from one stage to the next stage continuously through the intermediate transition flow channel 55, wherein the liquid at each stage is added with the same pressure head, namely a single-stage pressure head (lift), the liquid flowing through the discharge flow channel at the last stage (last stage) of the inner casing enters the inner annular chamber between the inner casing 5 and the pump cylinder 4, and the liquid finally enters the discharge pipeline through the discharge outlet of the pump cylinder to provide ultrahigh-pressure liquid flow.
Claims (2)
1. Double-shell axial split type ultrahigh pressure coke-cutting water pump comprises a pump end cover (1), a pump cylinder body (4), an inner shell (5), a pump suction chamber (6), a rotating shaft (7), a primary impeller (8), a secondary impeller (9), a final-stage impeller (10), a mechanical sealing part and a bearing part, and is characterized in that: the inner shell (5) is formed by an upper shell (51) and a lower shell (52) in an axial split mode, a plurality of discharge flow passages (54) and impeller suction chambers (53) are arranged in the inner shell (5) at intervals, and the discharge flow passages (54) are symmetrical space flow passages of double worm chambers and are communicated with the impeller suction chambers (53); the front impeller group formed by the first-stage impeller and the secondary impeller, the rear impeller group formed by the final-stage impeller and the secondary impeller are symmetrically arranged in opposite directions, and a middle transition flow passage (55) is arranged in the inner shell (5) and at the side edges of the last secondary impeller of the front impeller group and the rear impeller group; the pump suction chamber (6) is arranged independently and is arranged at the suction ends of the upper shell (51) and the lower shell (52) through a suction chamber stud (30) and a suction chamber nut (31), the front end of the pump suction chamber (6) is provided with a positioning pin (32) and is connected with the suction box body (38), the suction box body (38) is provided with a suction O-shaped ring (39), and the suction stud (40) and the suction nut (41) are fastened on the pump cylinder body (4) so that the positioning pin hole is aligned in the pump suction chamber (6) and the positioning pin (32); a balance cavity (56) is formed among the pump end cover (1), the inner shell (5) and the discharge end mechanical sealing component (13), a balance channel (57) communicated with the balance cavity (56) is arranged in the pump end cover (1), a balance pipe (58) connected with the balance channel (57) is externally connected to the pump end cover (1), the other end of the balance pipe (58) is connected with a suction inlet of the pump cylinder body (4), impeller hub sealing rings (45) are arranged among the primary impeller (8), the secondary impeller (9) and the inner shell (5), and pump body sealing ring seats (25) are sleeved at the side edges of the impeller hub sealing rings (45).
2. The dual housing axially split ultra-high pressure decoking water pump of claim 1, wherein: two sides of the inner throat part of the pump body sealing ring seat (25) are provided with separating tongues (44), and the separating tongues (44) are positioned in the impeller suction chamber (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910079532.1A CN109654024B (en) | 2019-01-28 | 2019-01-28 | Double-shell axial split type ultrahigh pressure coke cutting water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910079532.1A CN109654024B (en) | 2019-01-28 | 2019-01-28 | Double-shell axial split type ultrahigh pressure coke cutting water pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109654024A CN109654024A (en) | 2019-04-19 |
| CN109654024B true CN109654024B (en) | 2024-06-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910079532.1A Active CN109654024B (en) | 2019-01-28 | 2019-01-28 | Double-shell axial split type ultrahigh pressure coke cutting water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109654024B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2122249U (en) * | 1992-05-11 | 1992-11-18 | 王云奎 | Balance multi-stage centrifugal pump |
| CN2281431Y (en) * | 1996-03-01 | 1998-05-13 | 沈阳水泵厂 | Water supplying pump for pressure boiler |
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| CN2122249U (en) * | 1992-05-11 | 1992-11-18 | 王云奎 | Balance multi-stage centrifugal pump |
| CN2281431Y (en) * | 1996-03-01 | 1998-05-13 | 沈阳水泵厂 | Water supplying pump for pressure boiler |
| CN103225623A (en) * | 2013-04-24 | 2013-07-31 | 嘉利特荏原泵业有限公司 | Symmetric radial-splitting multistage centrifugal pump with single casing body |
| CN209638005U (en) * | 2019-01-28 | 2019-11-15 | 浙江科尔泵业股份有限公司 | Double-casing axially split type super-pressure coke cutting water pump |
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| CN109654024A (en) | 2019-04-19 |
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