CN218439876U - Multi-stage pump high-pressure end inserted nested multi-ring labyrinth pressure reduction structure - Google Patents
Multi-stage pump high-pressure end inserted nested multi-ring labyrinth pressure reduction structure Download PDFInfo
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- CN218439876U CN218439876U CN202222897865.5U CN202222897865U CN218439876U CN 218439876 U CN218439876 U CN 218439876U CN 202222897865 U CN202222897865 U CN 202222897865U CN 218439876 U CN218439876 U CN 218439876U
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Abstract
The utility model relates to a water pump technical field especially relates to multistage pump high-pressure side inserts nested formula multiple ring maze decompression structure, and the purpose realizes a decompression structure that mutual insertion contactless coupling formed the multiple ring combination for following feasible each side research of clearance flow characteristic, hydraulic loss, part manufacturing and cost. Multistage pump high-pressure end inserts nested formula multiple ring labyrinth decompression structure, includes: the water pump water outlet section is assembled with the seat ring, a multi-groove end is arranged on one side of the seat ring and consists of a plurality of concentric rings, and the radiuses of the concentric rings are from small to large from the axial center to the outer radiuses. The utility model discloses seat ring and lantern ring multislot end mutually insert the mode of contactless coupling, this structure forms 21 sharp turns round of locating 90 altogether, and more original structure increases 19 points of turning round, should sharply turn to and make local loss increase 9.5 times, and fluid medium turns to rapidly and kinetic energy loss in the production of local runner by itself, can reduce pressure to reduce and leak, improve equipment operating efficiency.
Description
Technical Field
The utility model relates to a water pump technical field especially relates to multistage pump high-pressure end inserts nested formula multiple ring labyrinth decompression structure.
Background
The outlet pressure of the water pump, especially the last stage impeller of the multi-stage pump, is high, and under the action of high differential pressure, a large amount of gap liquid existing between the high-pressure section structure and the low-pressure section structure leaks to a low-pressure area, so that the efficiency is reduced. The water pump belongs to a high-speed rotating machine, a gap is inevitably reserved between the rotating part and the static part shell, the high-pressure end of the gap inevitably flows to the low-pressure end, and the common pressure reducing and sealing modes include floating ring pressure reduction, gap throttling, labyrinth pressure reduction, screw driving pressure reduction and the like.
Because the pressure difference between high pressure and low pressure of the multi-stage water pump is large, for example, the total lift of the pump reaches 1000m, the pressure difference of a balance type reaches 500m, the high pressure difference is generated at two ends of a gap, the flowing speed of liquid is necessarily large, the backflow leakage loss is large at the same time, and the loss flow can reach 3-5%.
In the existing structural design of high and low pressure, the clearance is reduced by common treatment or reverse pumping is carried out by adopting threads (also provided with multi-head threads) to prevent leakage, because the structure is limited, the lift generated by the pumping of the threads is very small, and the lift generated by the thread lift can be basically ignored under the working condition of a few hundred meters of differential pressure (lift) at frequent movement. Therefore, the main pressure reducing and reducing measures still rely on the friction resistance generated between the radial dynamic and static annular gaps and the flowing process of the fluid to throttle, and the purpose of reducing leakage loss is achieved.
According to the use requirements, the multi-stage pump high-pressure end is inserted into the nested multi-ring labyrinth decompression structure, and the multi-ring labyrinth decompression structure is formed by mutual insertion and non-contact coupling through researches in aspects of gap flow characteristics, hydraulic loss, part manufacturing and cost feasibility.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a multistage pump high-pressure end inserts nested formula multiple ring maze decompression structure, realizes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the nested formula multiple ring maze decompression structure is inserted to multistage pump high pressure end includes:
the seat ring is assembled with the water outlet section of the water pump, one side of the seat ring is provided with a multi-groove end and consists of a plurality of concentric rings, and the radiuses of the concentric rings are from small to large from the axial center to the outer radius;
the lantern ring is positioned on one side of the last-stage impeller of the water pump, one side of the lantern ring is a multi-groove end, and the multi-groove end is composed of a plurality of concentric rings with different radiuses;
the multi-groove ends of the seat ring and the lantern ring are mutually inserted and coupled without contact, and a flow passage gap is formed between the seat ring and the lantern ring.
Preferably, the matching clearance between the seat ring and the base hole of the main shaft of the water pump is H7/H6, and the seat ring is fixed with the high-pressure water outlet section of the water pump by using a seam-riding screw.
Preferably, the matching clearance between the lantern ring and the base hole of the water pump main shaft is H7/H6, the lantern ring is connected with the main shaft, and in the running state, the lantern ring and the seat ring rotate relatively.
Preferably, the radial clearance control range of the concentric rings of the seat ring and the lantern ring is as follows: 0.25-0.3mm.
Preferably, the axial allowable adjustment clearance range of the assembly of the seat ring and the sleeve ring is as follows: 2.5-3.5mm.
Preferably, the maximum outer diameters of the seat ring and the collar are the same.
Preferably, the water pump model is DG46-50 × 6, and five mutually inserted nested structures are arranged at the multi-groove ends of the seat ring and the lantern ring.
The utility model discloses possess following beneficial effect at least:
1. the multi-ring pressure reducing structure consisting of the seat ring and the sleeve ring is arranged at the position from the high-pressure end to the low-pressure end of the multi-stage pump, compared with the pressure reducing structure of a common water pump, the multi-groove ends of the seat ring and the sleeve ring are mutually inserted and are not in contact coupling, the structure forms a sharp turn of 21-degree positions, 19 turn points are increased compared with the original structure, the local loss (pressure reduction) is increased by 9.5 times, the fluid self quickly turns to and loses kinetic energy in a local flow passage, the pressure is reduced, the leakage is reduced, and the operation efficiency of the equipment is improved.
2. According to the size of the actual pump size of each model of the multi-stage pump, a plurality of combinations which are mutually inserted and nested can be manufactured, the pump head of the water pump is high, the diameter of an impeller is large, the sizes of corresponding parts of the sizes of guide vanes, water outlet sections, middle sections and the like of cylinder bodies are simultaneously increased, more nested ring group structures can be arranged on the large-size structures, and five combined structures which are mutually inserted and nested can be manufactured by taking the water pump of D and DG46-50 x 6 as an example.
3. By controlling the radial clearance and the axial clearance of the seat ring and the lantern ring, the radial clearance is enlarged compared with the pressure reduction radial clearance of the existing pump, so that the particle trafficability is improved, the contact friction and the abrasion caused by the deviation of the axle center of the rotor in the actual operation are reduced, the failure rate of equipment is reduced, for example, a water pump with D and DG 46-50X 6 is taken as an example, the distance of a return flow channel formed by a multi-ring structure, which increases the path through which fluid flows, can reach 282mm, the length of hydraulic friction is increased, and the increased resistance can reduce the leakage amount.
4. The utility model discloses in, decompression simple structure, the processing cost of manufacture is low, does not have the influence basically to production, the supply mode of other spare parts of water pump, only changes the machining size.
5. The design clearance is adjusted to the axial increase between the seat ring and the lantern ring, and the play amount required by axial centering adjustment during the assembly of the original water pump rotor is not influenced.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a multi-groove end structure of a seat ring;
FIG. 2 is a schematic view of a seat ring connection end;
FIG. 3 is a schematic view of a multi-grooved end structure of the ferrule;
FIG. 4 is a schematic view of the collar connecting end;
FIG. 5 is a cross-sectional view of the seat ring and collar in engagement;
FIG. 6 is a schematic view of the assembly of a multi-ring pressure reducing structure within a multi-stage water pump.
In the figure: 1. a seat ring; 2. and (4) a lantern ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example one
Referring to fig. 1 to 6, a multi-stage pump high-pressure end is inserted into a nested multi-ring labyrinth pressure reduction structure, including:
the water pump water outlet section is characterized by comprising a seat ring 1, wherein the seat ring 1 is assembled with the water pump water outlet section, one side of the seat ring 1 is a multi-groove end and consists of a plurality of concentric rings, and the radiuses of the concentric rings are from small to large from the axial center to the outer radius;
the water pump comprises a lantern ring 2, wherein the lantern ring 2 is positioned on one side of a last-stage impeller of the water pump, one side of the lantern ring 2 is a multi-groove end, and the multi-groove end is composed of a plurality of concentric rings with different radiuses;
the multi-groove ends of the seat ring 1 and the lantern ring 2 are mutually inserted and coupled without contact, and a flow passage gap is formed between the seat ring 1 and the lantern ring 2;
the scheme has the following working processes: through set up the multiple ring pressure reducing structure who comprises seat ring 1 and lantern ring 2 in the position department of the high-pressure end of multistage pump to the low pressure end, compare the pressure reducing structure of ordinary water pump, the mode of seat ring 1 and lantern ring 2 multislot end mutual insertion contactless coupling, this structure forms 21 sharp turnings of locating 90 altogether, 19 turning points are increased to compare original structure, local loss (decompression) increase 9.5 times, according to hydrodynamics's basic characteristic, total resistance loss is exactly when the water conservancy is calculated: the total hydraulic loss = local loss + loss along the way, so that the fluid generates rapid steering and kinetic energy loss in a local flow passage, the pressure is reduced, the leakage is reduced, and the operation efficiency of the equipment is improved;
each local loss mode is: calculated resistance coefficient Ki = ζ -(2*g)*42/(π d 2 ) 2 When the flow Q passes through, the resistance hi = Ki × Q locally forms at each point 2 The sum of the local resistances at a plurality of consecutive positions is: Σ hi = (h 1+ h2+. Once+ h 22) =Σki × Q 2 Loss along path Δ h = K × ζ × L × Q2
Total resistance calculation = local resistance loss + on-way resistance loss: Σ Ki × Q2+ K × ζ × L × Q2= (∑ Ki × K × ζ × L) Q2, it can be known from a formula that the resistance characteristic is a parabolic characteristic in which the flow rate is the abscissa, and when the flow rate (the amount of leakage) is increased by this characteristic, the resistance shows a square relationship and is rapidly increased, so that the amount of leakage can be reduced by increasing the resistance by 9.5 times in the structure of the present application.
Furthermore, the matching clearance between the seat ring 1 and the base hole of the main shaft of the water pump is H7/H6, and the seat ring 1 is fixed with the high-pressure water outlet section of the water pump by using a seam-riding screw.
Further, the matching clearance between the lantern ring 2 and the base hole of the water pump main shaft is H7/H6, the lantern ring 2 is connected with the main shaft, and in the running state, the lantern ring 2 and the seat ring 1 rotate relatively.
Further, the radial clearance control range of the concentric rings of the seat ring 1 and the lantern ring 2 is as follows: 0.25-0.3mm, specifically, the clearance forms a plurality of 90-degree continuous sharp turning directions, the impact kinetic energy is attenuated, the liquid energy is reduced, the radial clearance is enlarged compared with the decompression radial clearance of the existing pump, thereby improving the particle trafficability, simultaneously reducing the contact friction and the abrasion caused by the axle center deviation in the actual operation of the rotor, and reducing the failure rate of the equipment, taking the water pump of D, DG 46-50X 6 as an example, the turning-back flow passage formed by the multi-ring structure is improved to ensure that the distance of the path increased by the fluid flowing through can reach 282mm, the length of the hydraulic friction is increased, and the increased resistance can reduce the leakage amount.
Further, the axial allowable adjustment clearance range of the assembly of the seat ring 1 and the lantern ring 2 is as follows: 2.5-3.5mm, and in particular, the control of the axial clearance is convenient for axially adjusting the centering runner.
Further, the maximum outer diameters of the seat ring 1 and the collar 2 are the same.
In one embodiment, the water pump is in a model DG46-50 × 6, five mutually-inserted nested structures are arranged at the multi-groove ends of the seat ring 1 and the lantern ring 2, and specifically, the service lives of the seat ring 1 and the lantern ring 2 can be synchronous with the service cycle of the multi-stage water pump body, so that the multi-stage water pump is convenient to maintain.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. Multistage pump high-pressure end inserts nested formula multiple ring labyrinth decompression structure, its characterized in that includes:
the water pump water outlet section is characterized by comprising a seat ring (1), wherein the seat ring (1) is assembled with the water pump water outlet section, one side of the seat ring (1) is provided with a multi-groove end and consists of a plurality of concentric rings, and the radiuses of the concentric rings are from small to large from the axial center to the outer radius;
the water pump comprises a lantern ring (2), wherein the lantern ring (2) is positioned on one side of a last-stage impeller of the water pump, one side of the lantern ring (2) is a multi-groove end, and the multi-groove end is composed of a plurality of concentric rings with different radiuses;
the multi-groove ends of the seat ring (1) and the lantern ring (2) are mutually inserted and coupled without contact, and a flow passage gap is formed between the seat ring (1) and the lantern ring (2).
2. The multi-stage pump high-pressure end inserted nested multi-ring labyrinth decompression structure is characterized in that the fit clearance between the seat ring (1) and a base hole of a main shaft of the water pump is H7/H6, and the seat ring (1) is fixed with a high-pressure water outlet section of the water pump by using a seam-riding screw.
3. The multi-stage pump high-pressure end insertion nested multi-ring labyrinth pressure reduction structure is characterized in that a fit clearance between the lantern ring (2) and a base hole of a water pump main shaft is H7/H6, the lantern ring (2) is connected with the main shaft, and in the operating state, the lantern ring (2) and the seat ring (1) rotate relatively.
4. The multi-stage pump high-pressure end insertion nested multi-ring labyrinth pressure reduction structure as claimed in claim 1, wherein the radial clearance control range of the concentric rings of the seat ring (1) and the collar ring (2) is: 0.25-0.3mm.
5. The multi-stage pump high-pressure end insertion nested multi-ring labyrinth decompression structure according to claim 1, characterized in that the axial allowable adjustment clearance range of the seat ring (1) and the collar ring (2) assembly is as follows: 2.5-3.5mm.
6. The multi-stage pump high-pressure end insert nested multi-ring labyrinth pressure reduction structure according to claim 1, characterized in that the maximum outer diameters of the seat ring (1) and the collar ring (2) are the same.
7. The multi-stage pump high-pressure end inserted nested multi-ring labyrinth decompression structure as claimed in claim 1, wherein the water pump model is DG46-50 x 6, and five mutually inserted nested structures are arranged at the multi-groove ends of the seat ring (1) and the lantern ring (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222897865.5U CN218439876U (en) | 2022-11-01 | 2022-11-01 | Multi-stage pump high-pressure end inserted nested multi-ring labyrinth pressure reduction structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222897865.5U CN218439876U (en) | 2022-11-01 | 2022-11-01 | Multi-stage pump high-pressure end inserted nested multi-ring labyrinth pressure reduction structure |
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| Publication Number | Publication Date |
|---|---|
| CN218439876U true CN218439876U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222897865.5U Active CN218439876U (en) | 2022-11-01 | 2022-11-01 | Multi-stage pump high-pressure end inserted nested multi-ring labyrinth pressure reduction structure |
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| Country | Link |
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| CN (1) | CN218439876U (en) |
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2022
- 2022-11-01 CN CN202222897865.5U patent/CN218439876U/en active Active
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