CN115263762A - Single-stage double-suction centrifugal pump with additional sealing cavity structure - Google Patents
Single-stage double-suction centrifugal pump with additional sealing cavity structure Download PDFInfo
- Publication number
- CN115263762A CN115263762A CN202211046395.XA CN202211046395A CN115263762A CN 115263762 A CN115263762 A CN 115263762A CN 202211046395 A CN202211046395 A CN 202211046395A CN 115263762 A CN115263762 A CN 115263762A
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- Prior art keywords
- pump
- driving end
- sealing
- driving
- cavity structure
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- 238000011010 flushing procedure Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 210000000476 body water Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Images
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
- F04D1/006—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps double suction 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
-
- 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
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a single-stage double-suction centrifugal pump with an increased sealing cavity structure, which comprises a non-driving bearing part, a pump shaft, a pump body, a pump cover, a sealing flushing part, an exhaust pipeline, an impeller and a driving end bearing part, wherein the non-driving bearing part is arranged on the pump shaft; the non-driving end and the driving end between the pump body and the pump cover are both provided with a sealing cavity, and sealing parts are arranged in the sealing cavities; the two ends of the sealed flushing part are respectively connected to the pump cover and the sealing part, the driving end of the pump is provided with a driving end bearing part, the non-driving end of the pump is provided with a non-driving end bearing part, and the driving end bearing part and the non-driving end bearing part are both fixed on the outer wall of the pump body; the sealed flushing component comprises two groups which are arranged at the driving end of the pump and the non-driving end of the pump; the invention adds a sealing cavity structure, the shell has small opening, the support rigidity is good, the universality is good, the shaft shoulder of the impeller is positioned, the rotor bears reasonable directional axial force, and the operation is more stable and reliable. The bearing is independently positioned by adopting the shaft shoulder, and the double-round nut is locked, so that the bearing is more accurately positioned and more stably stressed.
Description
Technical Field
The invention relates to a centrifugal pump, in particular to a single-stage double-suction centrifugal pump with an increased sealing cavity structure, which has the advantages of more accurate positioning of an impeller shaft shoulder, more stable bearing positioning and more stable stress.
Background
The double suction pump is used as a general fluid machine, and is widely applied to pipeline conveying occasions such as water supply systems of water plants, power plants, industrial production circulating water systems, irrigation pump stations, drainage pump station systems, building water supply systems, heating systems, refrigerating systems and the like due to the characteristics of large flow and high lift. In addition, the double-suction pump is mostly horizontally opened, so that the double-suction pump is convenient to check and maintain, small in axial force and stable in operation.
Currently, most double suction pumps have the following problems: the hub size of the hydraulic size of the model is large, and the center line radius of the inlet edge of the blade is large, so that the pump efficiency is low and the cavitation performance is poor; the axial size is larger, the rigidity of the rotor is low, and the operation reliability is poor; the axial positioning of key parts such as an impeller, a mechanical seal, a bearing and the like is inaccurate due to accumulated errors of part processing; the pump set has larger center height, which causes poor operation stability and large vibration; the part between the water suction chamber and the sealing cavity of the pump shell is easy to wear, the performance of the pump is influenced, and the cost for replacing the pump body and the pump cover after the pump body and the pump cover are worn is high; the seal structure causes the opening of the pump shell to be large and the rigidity of the shell to be poor; the sizes of the cavities and the shafts which are matched with the mechanical seal, the bulk mechanical seal and the packing seal are not uniform, and the universality is poor.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to provide a single-stage double-suction centrifugal pump with an increased seal cavity structure, which has the advantages of impeller shoulder positioning, more accurate bearing positioning and more stable stress.
The invention solves the technical problems through the following technical scheme: a single-stage double suction centrifugal pump with an added sealed cavity structure comprises: the pump comprises a non-driving bearing component, a pump shaft, a pump body, a pump cover, a sealing flushing component, an exhaust pipeline, an impeller and a driving end bearing component.
The non-driving end and the driving end between the pump body and the pump cover are both provided with a sealing cavity, and sealing parts are arranged in the sealing cavities; the two ends of the sealing and flushing component are respectively connected to the pump cover and the sealing component.
The pump body is connected with the pump cover through a fastener, and the impeller and the pump shaft are in key transmission; the impeller is axially positioned by a drive side shoulder and a non-drive side impeller nut.
The drive end of the pump is provided with a drive end bearing component, the non-drive end of the pump is provided with a non-drive end bearing component, and the drive end bearing component and the non-drive end bearing component are both fixed on the outer wall of the pump body.
The sealed flushing parts comprise two groups which are respectively arranged at the driving end of the pump and the non-driving end of the pump.
The exhaust pipeline is installed at the top of the pump cover.
In one embodiment of the present invention, the sealing flushing component comprises a flushing pipe and a flushing pipe matched connector, and the flushing pipe matched connector is arranged at two ends of the flushing pipe.
In the embodiment example of the invention, throat bushings are arranged between the pump body and the pump cover and the sealing part.
In the embodiment of the invention, an orifice plate is arranged between the pump cover and the sealed flushing part, and a flushing water outlet communicated with the orifice plate is formed in the pump cover.
In the concrete implementation example of the invention, bearings are arranged in the non-driving bearing component and the driving side bearing component, and the bearings on both sides are fixed through double-locking round nuts; water retaining rings are arranged between the non-driving bearing component and the driving side bearing component and between the sealing components.
In the embodiment example of the invention, a first sealing ring is arranged between the pump body and the pump cover and the impeller on the non-driving side, and a second sealing ring is arranged on the driving side.
In an embodiment of the invention, the non-drive bearing component and the drive bearing component are both fixed to the outer wall of the pump body by fasteners.
In an embodiment of the invention, the fastener is a bolt and nut combination.
In a specific embodiment of the invention, the driving end of the outer diameter size of the impeller sealing ring is 1-2 mm larger than that of the non-driving end.
The positive progress effects of the invention are as follows: the single-stage double-suction centrifugal pump with the additional sealing cavity structure provided by the invention has the following advantages: the structure of the invention is added with a sealing cavity structure, the shell has small opening, good supporting rigidity and good universality, the shaft shoulder of the impeller is positioned, and the rotor bears reasonable directional axial force, so the operation is more stable and reliable. The bearing is independently positioned by adopting the shaft shoulder, and the double-round nut is locked, so that the bearing is more accurately positioned and more stably stressed.
Drawings
Fig. 1 is a schematic view of the overall structure of a single-stage double-suction centrifugal pump provided by the invention.
Fig. 2 is an enlarged view of fig. 1 at a.
Fig. 3 is an enlarged view of fig. 1 at B.
The following are the names corresponding to the reference numbers in the invention:
in the figure: the device comprises a non-driving bearing component 1, a pump shaft 2, a pump body 3, a sealing component 4, a sealing flushing component 5, an impeller nut 6, a first sealing ring 7, a pump cover 8, a throttle orifice 9, an exhaust pipeline 10, an impeller 11, a key 12, a second sealing ring 13, a throat part lining 14, a water retaining ring 15, a driving end bearing component 16, a locking round nut 17 and a fastening component 18.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic view showing an overall structure of a single-stage double-suction centrifugal pump according to the present invention, fig. 2 is an enlarged view of fig. 1 at a, and fig. 3 is an enlarged view of fig. 1 at B, as shown in the above-mentioned figures: the invention provides a single-stage double-suction centrifugal pump with an increased sealing cavity structure, which comprises a non-driving bearing part 1, a pump shaft 2, a pump body 3, a sealing part 4, a sealing flushing part 5, an impeller nut 6, a first sealing ring 7, a pump cover 8, a throttling orifice plate 9, an exhaust pipeline 10, an impeller 11, a key 12, a second sealing ring 13, a throat part bush 14, a water retaining ring 15, a driving end bearing part 16, a locking round nut 17 and a fastening piece 18.
The pump shaft 2 and the impeller 11 are driven by a key 12; the impeller 11 is axially positioned by a shaft shoulder at the driving side and an impeller nut 6 at the non-driving side; a first sealing ring 7 is arranged between the pump body 3 and the pump cover 8 and the impeller 11 on the non-driving side, a second sealing ring 13 is arranged on the driving side, and the two sealing rings are used for reducing the leakage of high-pressure water in the pump cover of the pump body to the inlet of the impeller; the top of the pump cover 8 is provided with an exhaust pipeline 10, the side surface of the pump cover 8 is provided with a sealing washing component 5 which is used for guiding high-pressure washing water to the sealing component 4 so as to achieve the purposes of lubricating and cooling the seal; a throttle orifice 9 is arranged between the pump cover 8 and the sealing flushing component 5, and the function is to prevent the sealing component 4 from being damaged by overhigh pressure of high-pressure flushing water when the pump head is higher; throat bushings are arranged between the pump body 3, the pump cover 8 and the sealing part 4, so that the functions of throttling and preventing the pump body 3 and the pump cover 8 from being abraded are achieved, and the pump body 3 and the pump cover 8 are convenient to replace if abraded; bearings are arranged on the non-driving bearing component 1 and the driving side bearing component 16, and the bearings on the two sides are fixed through double locking round nuts 17; a water retaining ring 15 is arranged between the non-driving bearing component 1 and the driving side bearing component 16 and the sealing component 4, and the water retaining ring is used for preventing a small amount of liquid leaked from the sealing component from entering the bearing; both the non-driven bearing member and the driven bearing member are fixed to the outer wall of the pump body 3 by fasteners 18.
The driving end of the impeller sealing ring at the outer diameter size is 1-2 mm larger than the non-driving end (the axial force is controlled at 20-50 kg according to the design pressure), so that the rotor bears the directional axial force from the non-driving end to the driving end, and the pump runs more stably.
The double-suction pump reduces the diameter of the impeller hub so as to reduce the absolute speed when liquid flows into the impeller, the arc tangent point of the hub is just positioned on the shaft shoulder, the structural sizes of the two sides are the same, and the flow passing area on the liquid flow path of the water suction chamber, the impeller and the water pressing chamber is gradually controlled and reasonably changed. High operation efficiency and low cavitation.
The double-suction pump impeller adopts a shaft shoulder at the driving side of the pump and adopts an impeller nut at the non-driving side for axial positioning.
The pump shaft of the invention adopts a stepped design, thereby shortening the total length of the shaft and the span of the bearing, greatly reducing the axial size of the pump and improving the rigidity of the rotor.
According to the invention, the throat bush is arranged between the pump body water suction chamber and the sealing cavity, so that the functions of throttling and preventing the pump cover of the pump body from being worn are achieved, and the throat bush is convenient to replace after being worn.
The double-suction pump bearing adopts a mode that a shaft shoulder is matched with a double-locking round nut to carry out axial positioning, a non-driving end is a positioning bearing, and a driving end is a floating bearing.
According to the invention, on the premise of ensuring the performance, the flow channel and the overall dimension are reduced, so that the appearance is more compact, the finishing quality is smaller, the installation space is saved, and the basic load is reduced.
The suction pump sealing cavity structure is directly processed on the shell, the cavity size is uniform, and the integrated mechanical seal, the bulk mechanical seal and the packing seal can be interchanged.
The mechanical seal, the bearing and the like are independently positioned on the shaft by the shaft shoulder, so that the accumulated error is reduced.
In the invention, a throttle orifice is arranged between the pump cover and the sealing flushing component to prevent the damage of the mechanical seal caused by the entering of excessive pressure into the sealing cavity.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (9)
1. The utility model provides an increase single-stage double suction centrifugal pump of sealed chamber structure which characterized in that: the single-stage double-suction centrifugal pump with the additional sealed cavity structure comprises: the pump comprises a non-driving bearing component, a pump shaft, a pump body, a pump cover, a sealing and flushing component, an exhaust pipeline, an impeller and a driving end bearing component;
the non-driving end and the driving end between the pump body and the pump cover are both provided with a sealing cavity, and sealing parts are arranged in the sealing cavities; the two ends of the sealing and flushing component are respectively connected with the pump cover and the sealing component,
the pump body is connected with the pump cover through a fastening piece, and the impeller and the pump shaft are in transmission through a key; the impeller is axially positioned through a shaft shoulder at the driving side and an impeller nut at the non-driving side;
the driving end bearing part is arranged at the driving end of the pump, the non-driving end bearing part is arranged at the non-driving end of the pump, and the driving end bearing part and the non-driving end bearing part are both fixed on the outer wall of the pump body;
the sealed flushing parts comprise two groups which are respectively arranged at the driving end of the pump and the non-driving end of the pump;
the exhaust pipeline is installed at the top of the pump cover.
2. The single-stage double suction centrifugal pump with an added sealed cavity structure as claimed in claim 1, wherein: the sealing flushing component comprises a flushing pipe and a joint matched with the flushing pipe, and the joint matched with the flushing pipe is arranged at two ends of the flushing pipe.
3. The single-stage double-suction centrifugal pump with the added sealed cavity structure as claimed in claim 1, wherein: a throat bush is arranged between the pump body and the pump cover and between the pump cover and the sealing part.
4. The single-stage double suction centrifugal pump with an added sealed cavity structure as claimed in claim 1, wherein: a throttle orifice is arranged between the pump cover and the sealing flushing component, and a flushing water outlet communicated with the throttle orifice is formed in the pump cover.
5. The single-stage double suction centrifugal pump with an added sealed cavity structure as claimed in claim 1, wherein: bearings are arranged in the non-driving bearing component and the driving side bearing component, and the bearings on the two sides are fixed through double locking round nuts; water retaining rings are arranged between the non-driving bearing component and the driving side bearing component and between the sealing components.
6. The single-stage double suction centrifugal pump with an added sealed cavity structure as claimed in claim 1, wherein: a first sealing ring is arranged on the non-driving side between the pump body and the pump cover and between the pump cover and the impeller, and a second sealing ring is arranged on the driving side.
7. The single-stage double suction centrifugal pump with an added sealed cavity structure as claimed in claim 1, wherein: the non-drive bearing part and the drive bearing part are fixed on the outer wall of the pump body through fasteners.
8. The single-stage double-suction centrifugal pump with the added sealed cavity structure as claimed in claim 1, wherein: the fastener is a bolt and nut combination.
9. The single-stage double-suction centrifugal pump with the added sealed cavity structure as claimed in claim 1, wherein: the driving end of the outer diameter size of the impeller sealing ring is 1-2 mm larger than the non-driving end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211046395.XA CN115263762A (en) | 2022-08-30 | 2022-08-30 | Single-stage double-suction centrifugal pump with additional sealing cavity structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211046395.XA CN115263762A (en) | 2022-08-30 | 2022-08-30 | Single-stage double-suction centrifugal pump with additional sealing cavity structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115263762A true CN115263762A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211046395.XA Pending CN115263762A (en) | 2022-08-30 | 2022-08-30 | Single-stage double-suction centrifugal pump with additional sealing cavity structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115263762A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628187A (en) * | 2020-12-26 | 2021-04-09 | 上海凯泉泵业（集团）有限公司 | Sealing structure for replacing valve with orifice plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107542669A (en) * | 2017-10-20 | 2018-01-05 | 项达章 | A kind of single-stage double-suction radial direction subdivision centrifugal pump |
| CN206943013U (en) * | 2017-05-25 | 2018-01-30 | 湖南南方长河泵业有限公司 | A kind of wear-resistant single-stage double-suction middle-opening pump rinsed with cooling |
| CN107795490A (en) * | 2017-10-20 | 2018-03-13 | 项达章 | High-lift single-stage double-suction centrifugal pump |
-
2022
- 2022-08-30 CN CN202211046395.XA patent/CN115263762A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206943013U (en) * | 2017-05-25 | 2018-01-30 | 湖南南方长河泵业有限公司 | A kind of wear-resistant single-stage double-suction middle-opening pump rinsed with cooling |
| CN107542669A (en) * | 2017-10-20 | 2018-01-05 | 项达章 | A kind of single-stage double-suction radial direction subdivision centrifugal pump |
| CN107795490A (en) * | 2017-10-20 | 2018-03-13 | 项达章 | High-lift single-stage double-suction centrifugal pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628187A (en) * | 2020-12-26 | 2021-04-09 | 上海凯泉泵业（集团）有限公司 | Sealing structure for replacing valve with orifice plate |
| CN112628187B (en) * | 2020-12-26 | 2024-05-14 | 上海凯泉泵业（集团）有限公司 | Sealing structure of throttle orifice plate for replacing valve |
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