CN219953724U - Hollow shaft for pump and centrifugal pump with same - Google Patents
Hollow shaft for pump and centrifugal pump with same Download PDFInfo
- Publication number
- CN219953724U CN219953724U CN202321271138.6U CN202321271138U CN219953724U CN 219953724 U CN219953724 U CN 219953724U CN 202321271138 U CN202321271138 U CN 202321271138U CN 219953724 U CN219953724 U CN 219953724U
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- hollow shaft
- pump
- shaft
- hole
- head
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- 239000007788 liquid Substances 0.000 claims abstract description 20
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a hollow shaft for a pump and a centrifugal pump with the hollow shaft, the hollow shaft is arranged on the centrifugal pump, the centrifugal pump comprises a motor, a pump head assembly, an impeller and a shielding tank, the motor comprises a rotor assembly and a stator assembly, the hollow shaft is a part of the rotor assembly, one end of the hollow shaft, which is close to the pump head assembly, is a shaft head communicated with a low-pressure area, one end, which is far away from the pump head assembly, is a shaft tail positioned in the shielding tank, the shaft head drives the impeller to rotate, a spiral groove is formed in the outer wall surface of the hollow shaft, and a stepped through hole penetrates through the inner area of the hollow shaft for liquid to flow into the low-pressure area from the high-pressure area. Compared with the prior art, the utility model has the advantages of providing an effective liquid path circulation loop, relieving the influence of scale on the running performance of the rotating shaft and the like.
Description
Technical Field
The utility model relates to the technical field of shaft parts, in particular to a hollow shaft for a pump and a centrifugal pump with the hollow shaft.
Background
In heating system and cooling system, centrifugal pump that uses work in liquid environment, and wet running centrifugal pump's typical character lies in rotor and bearing braced system setting in the shielding tank, realizes moving seal and changes static seal, has effectively prevented the emergence of liquid leakage. The bearing support of a typical centrifugal pump is fitted to the cask for supporting the bearing on the one hand and for isolating the cask from the pump chamber into two relatively closed separate chambers, namely an impeller chamber and a rotor chamber, on the other hand. The rotating shaft of the centrifugal pump is arranged in the rotor and is a transmission device of a motor rotor and an impeller, when the pump does not operate, due to temperature difference and thermal expansion of liquid, the liquid axially flows along a lubricating film between the rotating shaft and a radial bearing, scale is easy to deposit between the rotating shaft and the radial bearing, the rotating shaft is not smooth to rotate, and starting obstruction of a pump unit is increased; when the pump unit works, the impeller rotates in the impeller cavity, in order to drive a liquid path in the pump to circulate, liquid is required to enter the rotor cavity from the impeller cavity to cool down by the motor and then return to the impeller cavity, a feasible fluid channel needs to be designed, and when the scheme that the flow channel of the fluid returning to the impeller cavity from the rotor cavity is arranged in the middle of the shaft is considered, the fluid channel facing the water inlet of the pumping chamber in the shaft needs to be slender, and the structure is extremely difficult to process in manufacturing and is extremely difficult to demould even in compression molding.
The search WO2008/058639A1 discloses a centrifugal pump of an electric motor, in particular a further flow path through a hollow rotor shaft, to in particular degas the rotor chamber, but which still has the above-mentioned problems.
Therefore, in order to solve the above-mentioned drawbacks of the prior art, there is an urgent need for a hollow rotating shaft that is easy to process and form, and that provides an effective liquid path circulation loop on the basis of being a common driving member, and that alleviates the problem that when the liquid flows in the gap between the rotating shaft and the bearing, the normal operation of the rotating shaft is affected due to the deposition of metal ions therein as scale.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a hollow shaft for a pump and a centrifugal pump with the hollow shaft.
The aim of the utility model can be achieved by the following technical scheme:
according to one aspect of the utility model, there is provided a hollow shaft for a pump, the hollow shaft being mounted on a centrifugal pump, the centrifugal pump comprising a motor, a pump head assembly, an impeller and a shielding can, the motor comprising a rotor assembly and a stator assembly, the hollow shaft being part of the rotor assembly, one end of the hollow shaft, which is close to the pump head assembly, being a shaft head communicating with a low pressure area, and one end, which is far from the pump head assembly, being a shaft tail located in the shielding can, the shaft head driving the impeller to rotate, the outer wall surface of the hollow shaft being provided with a spiral groove, the inner area of the hollow shaft being perforated with a stepped through hole for liquid to flow from the high pressure area into the low pressure area.
As a preferable technical scheme, the spiral groove is one groove penetrating through the shaft head and the shaft tail or a plurality of grooves with starting points and ending points at any position of the outer wall surface and arranged intermittently.
As the preferable technical scheme, the stepped through hole is provided with a shaft head counter bore, a central through hole and a stepped counter bore from the shaft head to the shaft tail, the shaft head counter bore is communicated with a low-pressure area, and the stepped counter bore is communicated with a high-pressure area.
As an optimal technical scheme, a clearance space is arranged between the outer wall surface of the hollow shaft and the inner wall of the front bearing of the motor.
As a preferable technical scheme, the depth of the central through hole is 0.5-2.0 mm, and the aperture is 0.4-1.0 mm.
As a preferable technical scheme, the central through hole is cylindrical or conical.
As the preferable technical scheme, the step counter bore comprises counter bore sections with different apertures, the counter bore section with the smallest aperture is directly connected with the central through hole, and the counter bore section with the largest aperture penetrates through the shaft tail.
As a preferable technical scheme, the outer wall of the shielding tank is tightly contacted with the inner wall of the motor stator assembly, and the heat of the stator assembly is directly conducted to the high-pressure liquid in the shielding tank through the outer wall of the shielding tank.
As an optimal technical scheme, the hollow shaft is made of ceramic materials.
According to another aspect of the present utility model, there is provided a centrifugal pump having a hollow shaft, comprising a motor, a pump head assembly, an impeller, and a cask, the motor comprising a rotor assembly and a stator assembly, the rotor assembly comprising the hollow shaft for a pump.
Compared with the prior art, the utility model realizes the following technical effects:
1) According to the hollow shaft for the pump, the spiral groove structure is arranged on the outer wall surface, when the pump unit works, the contact surface between the spiral groove on the outer wall surface and the inner wall of the front bearing is provided with the clearance gap, and the friction resistance is greatly reduced, so that the wet running pump unit can obtain better starting response.
2) When the design problem of the liquid path circulation for cooling the motor in the operation process of the pump is matched and solved, the design of the stepped through holes is utilized to provide a circulation loop in the liquid shaft on one hand; on the other hand, the shaft head and the shaft tail are provided with counter bores, so that the central through hole can be directly molded, and the problem that the slender central through hole is difficult to process and demould is effectively solved;
3) The slender central through hole is beneficial to pressure transition of liquid flowing from a high-pressure area to a low-pressure area, meanwhile, the depth range of the central through hole is 0.5-2 mm, the aperture range is 0.4-1.0 mm, the cooling effect is good, the pump efficiency is not obviously reduced, and the blocking of large particles in the system can be effectively avoided, so that the system is safe and reliable.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present utility model;
FIG. 2 is a schematic view of a spiral groove structure of an outer wall surface according to an embodiment of the present utility model;
FIG. 3 is a schematic view of the contact friction between the outer wall surface and the inner wall of the front bearing according to an embodiment of the present utility model;
FIG. 4 (a) is a schematic view of the structure of the central through hole of the present utility model;
FIG. 4 (b) is a schematic view of the cylindrical center through hole of the A part in FIG. 4 (a);
FIG. 4 (c) is a schematic view of a conical central through hole structure;
FIG. 5 is a schematic diagram of a wet pump set employing one embodiment of the present utility model;
FIG. 6 is a schematic view of a fluid channel employing an embodiment of the present utility model;
the pump head comprises a pump head component 1, an impeller 2, an impeller cover 3, a plane sealing ring 4, a shielding tank 5, a bearing support 6, a front bearing 7, an axial stop bearing 8, an axial stop bearing rubber sleeve 9, a rear bearing 10, a rear bearing 11, a rear bearing support 12, a rotor component 13, a stator component 14, a hollow shaft 14, a permanent magnet 15, a spiral groove 16, a shaft head counter bore 17, a shaft head counter bore 18, a central through hole 19, a step counter bore 20, a first gear aperture 21, a second gear aperture 21, an outer wall surface 22, a front bearing inner wall surface 23, a gap avoidance space 24, a high pressure area 25, a low pressure area 26, fluid passages S1 and S2, a cylindrical central through hole 27 and a conical central through hole 28.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
The utility model provides a hollow shaft for a pump, which is arranged on a centrifugal pump, wherein the centrifugal pump comprises a motor, a pump head assembly 1, an impeller 2 and a shielding tank 5, the motor comprises a rotor assembly 12 and a stator assembly 13, the hollow shaft 14 is a part of the rotor assembly, one end of the hollow shaft 14, which is close to the pump head assembly 1, is a shaft head communicated with a low-pressure area 26, one end, which is far away from the pump head assembly 1, is a shaft tail positioned in the shielding tank 5, the shaft head drives the impeller 2 to rotate, and a stepped through hole penetrates through the inner area of the hollow shaft 14 and is used for flowing liquid from a high-pressure area 25 into the low-pressure area 26, so that liquid path circulation is realized.
As shown in fig. 1, the outer wall surface 22 of the hollow shaft 14 is provided with a spiral groove 16, and the spiral groove 16 may be one groove penetrating through the shaft head and the shaft tail or a plurality of grooves with starting points and ending points at any position of the outer wall surface 22 and intermittently arranged, as shown in fig. 2. The matching relation between the hollow shaft 14 and the outer wall surface 22 of the front bearing and the rotor permanent magnet 15 is shown in fig. 3, and a clearance gap 24 is arranged between the outer wall surface 22 of the hollow shaft 14 and the inner wall 23 of the front bearing, and the clearance gap 24 effectively reduces the friction resistance between the hollow shaft 14 and the bearing, so that the wet running centrifugal pump unit can obtain better starting response. The hollow shaft 14 has stepped through holes extending through its interior for providing an in-shaft circuit for fluid circulation. The stepped through hole is connected with the shaft head counter bore 17, the central through hole 18 and the stepped through hole 19 in a seamless mode from the shaft head to the shaft tail, the stepped through hole 19 is provided with two sections with different apertures, and the apertures are a smaller first-gear aperture 20 and a larger second-gear aperture 21 respectively. The diameter of the central through hole 18 is the smallest, and the shape can be a cylindrical (shown in fig. 4 (b)) or a conical through hole (shown in fig. 4 (c)), as shown in fig. 4 (a), the depth range of 0.5-2 mm and the aperture range of 0.4-1.0 mm are satisfied, so that the operation efficiency of the pump is not obviously reduced while a good cooling effect is maintained, and the blockage of large particles in the system can be effectively avoided, thereby being safe and reliable.
Fig. 5 is a schematic illustration of the hollow shaft 14 used in connection with a wet pump assembly comprising a pump head assembly 1, an impeller 2, an impeller cover 3, a flat seal ring 4, a cask 5, a bearing support 6, a front bearing 7, an axial stop bearing 8, a stop bearing sleeve 9, a rear bearing 10, a rear bearing support 11, a rotor assembly 12, a stator assembly 13. The hollow shaft 14 is mounted in the rotor assembly 12 with bearings at both ends, one end near the pump head being a stub shaft disposed in the low pressure region 26, and one end remote from the pump head being a stub shaft passing through the high pressure region 25 to the inside of the cask 5, the stub shaft being welded to the impeller 2 to drive the impeller 2 to rotate.
Fig. 6 shows a fluid circulation flow path designed by using a hollow shaft 14, when the pump is running, the impeller 2 rotates to form a high pressure area 25 around, fluid enters the impeller 2 from a water inlet of the pump, enters the high pressure area 25 to the bearing support 6 under the action of the pump, enters the shielding tank 5 through a groove on the bearing support 6, as shown by S1 in fig. 6, flows in the axial direction from the head to the tail of the shaft in a gap between the rotor permanent magnet 15 and the shielding tank 5, achieves the effect of cooling the motor, flows into the bottom of the shielding tank 5 through a hole on a rear bearing support, flows back to a low pressure area 26 in the center of the impeller from a stepped through hole inside the hollow shaft 14 after the volume of the fluid is full, and flows back to the axial direction from the tail to the shaft head, as shown by S2 in fig. 6, and achieves fluid circulation. In the process, the slender central through hole is favorable for pressure transition of liquid flowing from a high-pressure area to a low-pressure area, and the shaft head and the shaft tail in the stepped through hole are provided with counter bores, so that the slender central through hole can be directly formed by a grinding tool, and the problem that the slender central through hole is difficult to process and demould is effectively solved.
Example 2
As shown in fig. 5, the present utility model also provides a centrifugal pump having a hollow shaft, comprising a motor including a rotor assembly 12 and a stator assembly 13, a pump head assembly 1, an impeller 2, and a shield can 5, the rotor assembly 12 including the hollow shaft for a pump according to embodiment 1.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. This hollow shaft for pump (14) is installed on centrifugal pump, centrifugal pump includes motor, pump head subassembly (1), impeller (2) and shield tank (5), the motor includes rotor subassembly (12) and stator module (13), hollow shaft (14) are part of rotor subassembly, one end that hollow shaft (14) is close to pump head subassembly (1) is the spindle nose that communicates with low pressure region (26), and the one end of keeping away from pump head subassembly (1) is the end that is located the shield tank (5), the spindle nose drives impeller (2) and rotates, a serial communication port, outer wall (22) of hollow shaft (14) are equipped with helicla flute (16), the inside region of hollow shaft (14) runs through there is the ladder through-hole for liquid flows in low pressure region (26) from high pressure region (25).
2. A hollow shaft for a pump according to claim 1, characterized in that the spiral groove (16) is one groove penetrating through the shaft head and the shaft tail or a plurality of grooves with starting points and ending points being arranged at any position on the outer wall surface (22) intermittently.
3. Hollow shaft for a pump according to claim 1, characterized in that the stepped through hole is arranged with a spindle head counter bore (17), a central through hole (18) and a stepped counter bore (19) from the spindle head to the spindle tail coaxially, the spindle head counter bore (17) being in communication with a low pressure area (26), the stepped counter bore (19) being in communication with a high pressure area (25).
4. Hollow shaft for a pump according to claim 1, characterized in that a clearance space (24) is provided between the outer wall surface (22) of the hollow shaft (14) and the inner wall (23) of the front bearing (7) of the motor.
5. A hollow shaft for a pump according to claim 3, characterized in that the depth of the central through hole (18) is 0.5-2.0 mm and the pore diameter is 0.4-1.0 mm.
6. Hollow shaft for a pump according to claim 5, characterized in that the central through hole (18) is cylindrical or conical.
7. A hollow shaft for a pump according to claim 3, characterized in that the stepped counterbore (19) comprises counterbore sections with different bore diameters, the counterbore section with the smallest bore diameter being directly connected to the central through hole (18), the counterbore section with the largest bore diameter penetrating the shaft end.
8. Hollow shaft for a pump according to claim 1, characterized in that the outer wall of the shielding tank (5) is in close contact with the inner wall of the stator assembly (13) of the motor, and that the heat of the stator assembly (13) is directly conducted to the high-pressure liquid in the shielding tank (5) through the outer wall of the shielding tank (5).
9. Hollow shaft for a pump according to claim 1, characterized in that the hollow shaft (14) is a hollow shaft made of ceramic material.
10. A centrifugal pump comprising a motor, a pump head assembly (1), an impeller (2) and a shielding can (5), said motor comprising a rotor assembly (12) and a stator assembly (13), characterized in that said rotor assembly (12) comprises a hollow shaft for a pump according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321271138.6U CN219953724U (en) | 2023-05-24 | 2023-05-24 | Hollow shaft for pump and centrifugal pump with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321271138.6U CN219953724U (en) | 2023-05-24 | 2023-05-24 | Hollow shaft for pump and centrifugal pump with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219953724U true CN219953724U (en) | 2023-11-03 |
Family
ID=88535339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321271138.6U Active CN219953724U (en) | 2023-05-24 | 2023-05-24 | Hollow shaft for pump and centrifugal pump with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219953724U (en) |
-
2023
- 2023-05-24 CN CN202321271138.6U patent/CN219953724U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |