CN211397907U - Single-suction type single-stage centrifugal pump - Google Patents
Single-suction type single-stage centrifugal pump Download PDFInfo
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- CN211397907U CN211397907U CN201922271125.9U CN201922271125U CN211397907U CN 211397907 U CN211397907 U CN 211397907U CN 201922271125 U CN201922271125 U CN 201922271125U CN 211397907 U CN211397907 U CN 211397907U
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Abstract
A single-suction single-stage centrifugal pump, the pump body (1) includes the impeller at least. The shell cover (2) comprises a single-side suction inlet (3) and an accommodating space which are arranged in sequence, and the impeller (4) is arranged in the accommodating space. The impeller (4) is a single-suction impeller, namely, a suction inlet (3) is arranged on one side of the impeller (4) in the shell cover (2), and a rear cover plate (6) is arranged on the other side of the impeller (4) without the suction inlet (3); a rear contact plate (7) is arranged outwards at the horizontal position of the rear cover plate and the top end of the impeller suction inlet (3), and a sealing ring (9) is arranged between the rear contact plate (7) and the rear port (8). A balance hole (5) is horizontally arranged between the rear cover plate (6) and the hub (10). The shaft sleeve (11) is tightly attached to the hub (10). The area of the balance hole (5) is 3-5 times of the gap of the opening ring. Supporting legs (12) are fixed at the bottom of the pump body (1), and the four supporting legs (12) are positioned on the same horizontal plane.
Description
Technical Field
The utility model relates to a centrifugal pump technical field provides a single suction type single-stage centrifugal pump very much.
Background
The single-stage split pump is an important centrifugal pump structure completely conforming to the international standard API610 centrifugal pump for petroleum, heavy chemistry and natural gas industry, and the structural code is BB 1. The inlet and outlet flanges are positioned on the lower pump body, so that the pump body pipeline flange does not need to be disassembled for maintenance, the maintenance is quick and convenient, and the pump body pipeline flange is widely applied to oil (water) pipelines, water treatment and petrochemical processes.
As shown in the attached figure 1 of the specification, the single-stage middle-open pump impeller is of a double-suction structure, and blades are symmetrically arranged back to back. The double-suction impeller enables the pump to obtain a working condition that the flow is doubled greatly under the condition of the same lift, and meanwhile, the blades are symmetrically arranged back to enable the axial force to be automatically balanced, and the operation is stable and reliable.
However, the structure has the insurmountable disadvantages of low efficiency and high energy consumption under the working conditions of relatively low flow rate and relatively high lift. The principle is as follows:
according to the performance parameter characteristics of the centrifugal pump, the hydraulic efficiency of the centrifugal pump is closely related to a dimensionless constant-specific speed ns:
wherein:
n-rotational speed, rpm
Q-flow, m3/h
H-single lift, m
It follows that n when a centrifugal pump is usedsThe larger the efficiency is, the more remarkable the energy-saving effect is, and otherwise, the efficiency is low and the energy consumption is high. In other words, the smaller the flow rate and the higher the head, the lower the efficiency of the centrifugal pump.
For a single-stage split pump, since the impeller adopts a double-suction structure, the flow Q is divided by 2 to obtain a single-side suction flow, so that n is the ratio of the suction flow to the suction flowsThe value of (c) decreases. Generally nsThe parameters less than 80 belong to the working condition of low specific speed, the efficiency of the pump is very low, and the requirements of energy conservation and environmental protection cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a centrifugal pump with energy-concerving and environment-protective, high-efficient operation.
The utility model particularly provides a single suction type single-stage centrifugal pump, pump body 1 includes the impeller at least. The casing cover 2 includes a single-side suction port 3 and an accommodation space, which are sequentially provided, and the impeller 4 is disposed in the accommodation space. The method is characterized in that: impeller 4 is single suction type impeller, and 4 one sides of impeller in cap 2 set up sunction inlet 3 promptly, and the 4 opposite sides of impeller that do not set up sunction inlet 3 are back shroud 6, are equivalent to the utility model discloses remove one side impeller in the double suction type impeller, use the back shroud shutoff to replace. A rear contact plate 7 is provided outwardly of the rear cover plate at a level with the top end of the impeller suction port 3, and a seal ring 9 is provided between the rear contact plate 7 and a pump seal ring disposed on the inner periphery of the rear port 8.
A balance hole 5 is horizontally arranged between the rear cover plate 6 and the hub 10. When the impeller is of a double-suction structure, the blades are symmetrically arranged back to back, so that the axial force is automatically balanced. The utility model discloses a formula design is inhaled to the unilateral, and the axial force is balanced through balanced hole. The suction side of the impeller is provided with a balance hole, the area of the balance hole is about 4 times of the gap of the opening ring, and the balance hole enables the suction side of the impeller and the back side of the impeller to have equal pressure, so that the axial force is balanced; meanwhile, the balance hole also eliminates the flow dead zone of the suction area at the two sides of the pump body, and improves the inlet condition of the pump.
The sleeve 11 is tightly attached to the hub 10.
Each impeller blade is provided with only one balance hole 5, and the area of the balance hole 5 is 3-5 times of the gap of the opening ring.
The bottom of the pump body 1 is fixed with supporting legs 12, and four supporting legs 12 are on the same horizontal plane.
The utility model changes the double-suction structure of the impeller into the single-suction structure, and changes the double-side suction of the fluid into the single-side suction form, namely, the fluid is sucked into the suction inlet of the single side of the impeller from the suction channel of the pump body and then flows out through the discharge channel of the pump body; and the suction inlet on the other side of the impeller no longer draws in fluid. According to the foregoing nsThe formula is calculated so that the flow rate Q is the total flow rate of the pump and does not need to be divided by 2, so nsThe numerical value of (A) is greatly improved, so that higher hydraulic efficiency is obtained.
The utility model has the characteristics of preparation or transformation are simple. When the technology is improved, the design of other parts except the shaft and the impeller, such as the original pump body, the original pump cover and the like, is kept unchanged, the standardization and the generalization of the pump can be met to achieve the optimum, the product specification can be avoided to the greatest extent, meanwhile, the investment of a casting die can be reduced, the cost is reduced, and the management is simple and convenient.
The impeller with small flow can utilize the existing model of a mature single-stage pump impeller, particularly, the impeller with a longer inlet end at the front part of the ZA series is designed, and the length requirement of the original pump body on the axial size of the position of an impeller suction port ring can be completely met. During transformation, when the sand mold is manufactured in the casting process, the rear sealing ring is lengthened to the required axial size by adopting a mode of a movable block, so that an impeller casting is easily obtained, an impeller mold does not need to be manufactured again, and hydraulic design does not need to be carried out again.
The utility model discloses because the difference of axle extension end can obtain two kinds and turn to, promptly the utility model discloses can be according to the needs of reality for centrifugal pump motor clockwise turning also can obtain anticlockwise rotation. As shown in the accompanying drawings 2 and 3 of the specification, the single suction impeller of the present invention is also designed in a central line symmetry manner, and the inlet and outlet flanges of the pump are arranged in completely symmetrical and opposite directions by different arrangement manners; and through the sunction inlet orientation that changes the impeller to adjust axial dimensions through axle sleeve mounted position, realized two kinds and turned to the design of the same pump body, make the utility model discloses in the use, the arrangement of pipeline is nimble more and standard.
The utility model discloses make the existing former pump both ends of well turn on pump support, the pump body axial opens the structural advantage, can satisfy the operating mode parameter requirement of user's flow, lift again, can also still keep very high efficiency under the less operating mode condition of flow simultaneously, effectively solve the problem that low specific speed single-stage well turn on pump efficiency low energy consumption is high, energy saving and consumption reduction effect is obvious, realizes energy saving and emission reduction and environment friendly's effect, reduces the use cost of use unit.
Drawings
The invention is described in further detail below with reference to the drawings in the specification:
FIG. 1 is a schematic view of an overall structure of a conventional split pump;
FIG. 2 is a schematic view of the overall structure of the present invention;
fig. 3 is a schematic view of the overall structure of the present invention.
Description of the symbols of the drawings:
the pump comprises a pump body 1, a cover 2, a suction inlet 3, an impeller 4, a balance hole 5, a rear cover plate 6, a rear contact plate 7, a rear port 8, a sealing ring 9, a hub 10, a shaft sleeve 11, supporting legs 12, a pump body suction flow channel 13, a pump body discharge flow channel 14 and a blade flow channel 15.
The direction of the arrow is the direction of fluid flow.
Detailed Description
Example 1
The embodiment aims to provide the centrifugal pump which is energy-saving, environment-friendly and efficient in operation.
The embodiment specifically provides a single-suction type single-stage centrifugal pump, and the pump body 1 at least comprises an impeller. The casing cover 2 includes a single-side suction port 3 and an accommodation space, which are sequentially provided, and the impeller 4 is disposed in the accommodation space. The method is characterized in that: the impeller 4 is a single-suction impeller, that is, the suction port 3 is arranged on one side of the impeller 4 in the casing cover 2, and the back cover plate 6 is arranged on the other side of the impeller 4 without the suction port 3, which is equivalent to that one side of the double-suction impeller is removed and plugged by the back cover plate. A rear contact plate 7 is provided outwardly of the rear cover plate at a level with the top end of the impeller suction port 3, and a seal ring 9 is provided between the rear contact plate 7 and a pump seal ring disposed on the inner periphery of the rear port 8.
A balance hole 5 is horizontally arranged between the rear cover plate 6 and the hub 10. When the impeller is of a double-suction structure, the blades are symmetrically arranged back to back, so that the axial force is automatically balanced. This embodiment uses a single side suction design, with the axial forces balanced by balancing holes. The suction side of the impeller is provided with a balance hole, the area of the balance hole is about 4 times of the gap of the opening ring, and the balance hole enables the suction side of the impeller and the back side of the impeller to have equal pressure, so that the axial force is balanced; meanwhile, the balance hole also eliminates the flow dead zone of the suction area at the two sides of the pump body, and improves the inlet condition of the pump.
The sleeve 11 is tightly attached to the hub 10.
Each impeller blade is provided with only one balance hole 5, and the area of the balance hole 5 is 3-5 times of the gap of the opening ring.
The bottom of the pump body 1 is fixed with supporting legs 12, and four supporting legs 12 are on the same horizontal plane.
In the embodiment, the double-suction structure of the impeller is changed into the single-suction structure, and the double-side suction of the fluid is changed into the single-side suction form, namely, the fluid is sucked into a suction inlet on one side of the impeller from a pump body suction flow channel and then flows out through a pump body discharge flow channel; and the suction inlet on the other side of the impeller no longer draws in fluid. According to the foregoing nsThe formula is calculated so that the flow rate Q is the total flow rate of the pump and does not need to be divided by 2, so nsThe numerical value of (A) is greatly improved, so that higher hydraulic efficiency is obtained.
The embodiment has the characteristic of simple manufacture or modification. When the technology is improved, the design of other parts except the shaft and the impeller, such as the original pump body, the original pump cover and the like, is kept unchanged, the standardization and the generalization of the pump can be met to achieve the optimum, the product specification can be avoided to the greatest extent, meanwhile, the investment of a casting die can be reduced, the cost is reduced, and the management is simple and convenient.
The impeller with small flow can utilize the existing model of a mature single-stage pump impeller, particularly, the impeller with a longer inlet end at the front part of the ZA series is designed, and the length requirement of the original pump body on the axial size of the position of an impeller suction port ring can be completely met. During transformation, when the sand mold is manufactured in the casting process, the rear sealing ring is lengthened to the required axial size by adopting a mode of a movable block, so that an impeller casting is easily obtained, an impeller mold does not need to be manufactured again, and hydraulic design does not need to be carried out again.
This embodiment can obtain two kinds of directions because the difference of axle extension end, and this embodiment can be according to actual needs promptly for centrifugal pump motor clockwise rotates, also can obtain anticlockwise rotation. As shown in the accompanying fig. 2 and 3 of the specification, the single suction impeller described in this embodiment is also designed in a central line symmetric form, and the inlet and outlet flanges of the pump are arranged in completely symmetric and opposite directions by different arrangement modes; and through changing the sunction inlet orientation of impeller to adjust axial dimensions through axle sleeve mounted position, realized two kinds of designs that turn to the same pump body, make this embodiment in the use, the arrangement of pipeline is nimble more and standard.
The pump has the advantages that the pump has the advantages of being supported at two ends of the original pump and axially arranged in the pump body, the requirements of flow and lift working condition parameters of users can be met, meanwhile, high efficiency can be still kept under the working condition that the flow is small, the problem that the pump is arranged in a single-stage at a low specific speed and is low in efficiency and energy consumption is effectively solved, the energy-saving and consumption-reducing effects are obvious, the effects of energy conservation and emission reduction and environmental friendliness are achieved, and the use cost of a user unit is reduced.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Moreover, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Claims (4)
1. A single-suction single-stage centrifugal pump, the pump body (1) comprising at least an impeller: the shell cover (2) comprises a single-side suction inlet (3) and an accommodating space which are arranged in sequence, and the impeller (4) is arranged in the accommodating space; the method is characterized in that: the impeller (4) is a single-suction impeller, namely, a suction inlet (3) is arranged on one side of the impeller (4) in the shell cover (2), and a rear cover plate (6) is arranged on the other side of the impeller (4) without the suction inlet (3); a rear contact plate (7) is arranged outwards at the horizontal position of the rear cover plate and the top end of the impeller suction inlet (3), and a sealing ring (9) is arranged between the rear contact plate (7) and the rear port (8);
a balance hole (5) is horizontally arranged between the rear cover plate (6) and the hub (10);
the shaft sleeve (11) is tightly attached to the hub (10).
2. The centrifugal pump of claim 1, wherein: the area of the balance hole (5) is 3-5 times of the gap of the opening ring.
3. The centrifugal pump of claim 2, wherein: each impeller blade is provided with only one balance hole (5).
4. The centrifugal pump of claim 1, wherein: supporting legs (12) are fixed at the bottom of the pump body (1), and the four supporting legs (12) are positioned on the same horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922271125.9U CN211397907U (en) | 2019-12-17 | 2019-12-17 | Single-suction type single-stage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922271125.9U CN211397907U (en) | 2019-12-17 | 2019-12-17 | Single-suction type single-stage centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211397907U true CN211397907U (en) | 2020-09-01 |
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ID=72224323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922271125.9U Active CN211397907U (en) | 2019-12-17 | 2019-12-17 | Single-suction type single-stage centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211397907U (en) |
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2019
- 2019-12-17 CN CN201922271125.9U patent/CN211397907U/en active Active
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