Water pump with mechanical seal sand blocking structure
By adding a sand-blocking structure and sedimentation channel to the outside of the submersible pump's mechanical seal, the problem of mud and sand entering the mechanical seal and shaft clearance was solved, achieving stable pump operation and cost reduction, and improving the protective effect of the mechanical seal.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHIMGE PUMP IND (ZHEJIANG) CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-07-03
AI Technical Summary
In environments such as rivers, existing submersible pumps are prone to mechanical seal wear or jamming due to the easy entry of silt into the mechanical seal and the gap between the mechanical seal and the shaft. This affects the normal operation of the pump, increases maintenance frequency and costs.
An additional sand-blocking structure, including a sedimentation channel, is added to the outside of the mechanical seal to prevent mud and sand from entering the mechanical seal and the gap between the mechanical seal and the shaft. The mud and sand are discharged through the sedimentation channel and the discharge channel to maintain a clean and stable operating environment for the mechanical seal.
It effectively prevents sediment from entering the mechanical seal, reduces maintenance frequency, ensures normal operation of the water pump, reduces operating costs, and improves sediment discharge efficiency through the mixing structure and sand guide channel, maintaining a clean environment for the mechanical seal.
Smart Images
Figure CN224453157U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water pumps, and in particular to a water pump with an mechanical seal sand-blocking structure. Background Technology
[0002] Submersible pumps are commonly used in environments such as rivers. The mechanical seal installed in the submersible pump is a sealing component used to ensure the internal seal of the pump and prevent the liquid inside the pump from leaking outward along the shaft, affecting hydraulic efficiency, or entering the motor, causing motor failure or even burnout.
[0003] Therefore, in order to ensure the sealing reliability of the mechanical seal, the mechanical seal needs to work in a relatively clean and stable liquid environment. However, environments such as rivers often contain a lot of silt (or other fine solid particles, collectively referred to as silt in this article). The silt can easily enter the mechanical seal and the gap between the mechanical seal and the shaft, causing wear of the mechanical seal and shaft or jamming of the mechanical seal, resulting in mechanical seal failure, affecting the normal operation of the water pump, and increasing the probability and cost of maintenance. Summary of the Invention
[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art by providing a water pump with a mechanical seal sand-blocking structure. The mechanical seal sand-blocking structure is installed on the outside of the mechanical seal, and the mechanical seal sand-blocking structure has a sedimentation channel. The mechanical seal sand-blocking structure is used to prevent external mud and sand from entering the mechanical seal and the gap between the mechanical seal and the shaft. The sedimentation channel is used to deposit the mud and sand that enters the mechanical seal sand-blocking structure and discharge it. This helps to maintain a relatively clean and stable liquid environment for the mechanical seal to operate, which helps to ensure the normal operation of the water pump, and also helps to reduce the probability of maintenance and replacement and reduce the operating cost of the water pump.
[0005] The above-mentioned technical objective of this utility model is mainly achieved through the following technical solution: a water pump with a mechanical seal sand-blocking structure, comprising a motor, a pump body, and a motor base connecting the motor and the pump body, wherein a rotating shaft on the motor passes through the motor base and is connected to an impeller inside the pump body, a mechanical seal is provided between the rotating shaft and the motor base, and the mechanical seal is fitted with the inner cavity of the motor base, characterized in that a mechanical seal sand-blocking structure is provided on the outer side of the mechanical seal, the mechanical seal sand-blocking structure has a sedimentation channel, the mechanical seal sand-blocking structure is used to prevent external mud and sand from entering the mechanical seal and the gap between the mechanical seal and the rotating shaft, and the sedimentation channel is used to deposit the mud and sand that enters the mechanical seal sand-blocking structure and discharge it.
[0006] The difference between this technical solution and existing technologies lies in the addition of a sand-blocking structure to the outside of the mechanical seal, with a sedimentation channel within this structure. The sand-blocking structure prevents external sediment from entering the mechanical seal and the gap between the mechanical seal and the shaft. The sedimentation channel collects and discharges any sediment that enters the sand-blocking structure. This helps maintain a relatively clean and stable liquid environment for the mechanical seal's operation, ensuring normal pump operation, reducing the likelihood of maintenance and replacement, and lowering pump operating costs.
[0007] The sedimentation channel can directly discharge the sediment deposited in it through its lower end, or the direction of the discharged sediment can be changed by the added discharge channel, so that the sediment is discharged away from the mechanical seal, which is more conducive to maintaining a relatively clean and stable liquid environment for the mechanical seal to operate.
[0008] As a further improvement and supplement to the above technical solution, the present invention adopts the following technical measures:
[0009] Preferably, the bottom of the mechanical seal sand-blocking structure is provided with a discharge channel. The inner end of the discharge channel communicates with the deposition channel, and the outer end is located on the outer wall of the mechanical seal sand-blocking structure. The discharge channel is horizontally arranged, or it is inclined with the inner end higher than the outer end. The discharge channel is used to change the direction of the discharged sediment, discharging the sediment deposited in the deposition channel radially outward away from the mechanical seal, which further helps to maintain a relatively clean and stable liquid environment for the mechanical seal operation.
[0010] Preferably, the mechanical seal sand-blocking structure includes a sand-proof cover over the outside of the mechanical seal and a sand-collecting cylinder fitted around the sand-proof cover. The sand-proof cover and the sand-collecting cylinder are spaced apart through the sedimentation channel. The lower end of the sand-collecting cylinder mates with a motor base. The sand-collecting cylinder and the motor base can be separate or integrated. In practical applications, to reduce the number of parts and facilitate production, assembly, and maintenance, the sand-collecting cylinder and the motor base are often integrated. A shaft hole is provided at the top of the sand-proof cover, through which a rotating shaft passes. The sand-proof cover is fixedly connected to the rotating shaft, and the sand-proof cover rotates with the rotating shaft, which facilitates the discharge of silt entering the sedimentation channel and prevents silt from accumulating in the sedimentation channel and being squeezed into the mechanical seal or the gap between the mechanical seal and the rotating shaft.
[0011] Preferably, the outer wall of the sand shield is provided with at least one protruding stirring structure, which is located in the sedimentation channel. The outer end of the stirring structure is in clearance fit with the inner wall of the sedimentation cylinder. The stirring structure has a circumferential stirring surface, which is used to rotate the fluid and sediment in the sedimentation channel circumferentially, facilitating timely and rapid discharge and preventing accumulation. This helps to prevent sediment from entering the mechanical seal and damaging the mechanical seal and shaft. To enhance the stirring effect, the length of each stirring structure is the same as the length of the sand shield.
[0012] Preferably, the stirring structure and the sand cover are an integral structure, and the stirring structure is a blade or a rib.
[0013] Preferably, the inner wall of the settling cylinder is provided with an axially downward spiral sand guide groove, the inner side of which is connected to the sedimentation channel. This groove is used to spirally deposit the silt between the sand shield and the settling cylinder downward, preventing silt accumulation and preventing silt from entering the mechanical seal, thereby helping to protect the clean working environment of the mechanical seal.
[0014] Preferably, a collecting groove ring is provided between the motor base, the sand shield, and the sedimentation cylinder. The collecting groove ring is connected to both the sedimentation channel and the discharge channel of the mechanical seal sand-blocking structure. The collecting groove ring helps to buffer the sediment falling into the sedimentation channel, facilitates its entry into the discharge channel, and allows the discharge channel to change the direction of sediment flow, thereby improving discharge efficiency.
[0015] Preferably, a convex ring is provided on the motor base, the upper end of which corresponds to the lower end of the sand shield. The outer diameter of the convex ring is smaller than the outer diameter of the sand shield. The convex ring is located in the inner cavity of the sand settling cylinder, and the collecting groove ring is located between the convex ring and the sand settling cylinder. The convex ring facilitates the formation of the collecting groove ring, which also facilitates the setting of a sand guiding groove on the inner wall of the sand settling cylinder. Furthermore, it prevents sediment from accumulating at the stationary and rotating rings of the mechanical seal, thus helping to prevent sediment from entering the mechanical seal and further protecting it.
[0016] Preferably, a retaining ring is provided at the lower end of the sand cover. The lower end of the retaining ring extends beyond the mating surface between the lower end of the sand cover and the convex ring and extends into the collecting groove ring. The retaining ring is used to prevent mud and sand from entering the gap between the sand cover and the convex ring, that is, the gap between the stationary ring and the moving ring of the mechanical seal.
[0017] Preferably, the stationary ring of the mechanical seal is disposed in the motor housing, with the upper end of the stationary ring flush with the upper end of the convex ring, and the upper end of the sand shield higher than the upper end of the sedimentation cylinder. In other words, the upper end of the collecting groove ring corresponds to the upper end of the convex ring, which facilitates the smooth deposition of sediment in the collecting groove ring and prevents sediment from entering the mechanical seal through the gap between the convex ring and the sand shield.
[0018] The beneficial effects of this utility model are as follows: 1. A sand-blocking structure is added to the outside of the mechanical seal, and the sand-blocking structure has a sedimentation channel. The sand-blocking structure prevents external mud and sand from entering the mechanical seal and the gap between the mechanical seal and the shaft. The sedimentation channel is used to deposit and discharge the mud and sand that enters the sand-blocking structure, which helps maintain a relatively clean and stable liquid environment for the mechanical seal's operation, ensuring normal pump operation, reducing maintenance and replacement frequency, and lowering pump operating costs. 2. The stirring structure causes the fluid and mud and sand in the sedimentation channel to rotate circumferentially, facilitating timely and rapid discharge and preventing accumulation, thus preventing mud and sand from entering the mechanical seal and damaging the mechanical seal and shaft. 3. The sand guide trough facilitates the spiral downward deposition of mud and sand between the sand shield and the sedimentation cylinder, preventing mud and sand accumulation and entry into the mechanical seal, thereby protecting the clean working environment of the mechanical seal. 4. The collecting trough ring helps buffer the mud and sand falling into the sedimentation channel, facilitating its entry into the discharge channel and allowing the discharge channel to change the direction of mud and sand flow, improving discharge efficiency. 5. The retaining ring is used to prevent mud and sand from entering the gap between the sandproof cover and the convex ring, that is, the gap between the stationary ring and the moving ring of the mechanical seal. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of this utility model.
[0020] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure.
[0021] Figure 3 This is a structural schematic diagram of a sand cover involved in this utility model.
[0022] Figure 4 yes Figure 2 A partially enlarged structural diagram.
[0023] Figure 5 yes Figure 2 or Figure 4 An enlarged structural diagram of part A in the middle.
[0024] Figure 6 yes Figure 2 or Figure 4 An enlarged schematic diagram of another structure of part A in the middle.
[0025] In the diagram: 1. Motor; 2. Pump body; 3. Motor base; 4. Mechanical seal; 5. Stationary ring; 6. Dynamic ring; 7. Sedimentation channel; 8. Discharge channel; 9. Sand cover; 10. Sedimentation cylinder; 11. Agitator structure; 12. Sand guide trough; 13. Collection trough ring; 14. Convex ring; 15. Retaining ring. Detailed Implementation
[0026] The technical solution of this utility model will be further described in detail below through embodiments and with reference to the accompanying drawings. In this document, "upper" and "lower" are relative to... Figure 1 The terms "inside" and "inner wall" are defined as above and below. "Inside" refers to the direction facing the axis of rotation, while "outside" refers to the direction away from it.
[0027] Example: Figures 1-5 As shown, a water pump with a mechanical seal sand-blocking structure includes a motor 1, a pump body 2, and a motor base 3 connecting the motor 1 and the pump body 2. The rotating shaft on the motor 1 passes through the motor base 3 and is connected to the impeller inside the pump body 2. A mechanical seal 4 is provided between the rotating shaft and the motor base 3, and the mechanical seal 4 cooperates with the inner cavity of the motor base 3.
[0028] The difference between this technical solution and the prior art is that: the outer side of the mechanical seal 4 is covered with a sand-blocking structure, and the sand-blocking structure of the mechanical seal 4 has a sedimentation channel 7. The sand-blocking structure of the mechanical seal 4 is used to prevent external mud and sand from entering the mechanical seal 4 and the gap between the mechanical seal 4 and the rotating shaft. The sedimentation channel 7 is used to deposit the mud and sand that enters the sand-blocking structure of the mechanical seal 4 and discharge it.
[0029] In this technical solution: a sand-blocking structure is added to the outside of the mechanical seal 4, and the sand-blocking structure of the mechanical seal 4 has a sedimentation channel 7. The sand-blocking structure of the mechanical seal 4 is used to prevent external mud and sand from entering the mechanical seal 4 and the gap between the mechanical seal 4 and the rotating shaft. The sedimentation channel 7 is used to deposit and discharge the mud and sand that enters the sand-blocking structure of the mechanical seal 4. This helps maintain a relatively clean and stable liquid environment for the mechanical seal 4 during operation, which helps ensure the normal operation of the water pump, reduces the probability of maintenance and replacement, and lowers the operating cost of the water pump.
[0030] The sedimentation channel 7 can directly discharge the sediment deposited in the sedimentation channel 7 through its lower end, or the direction of the discharged sediment can be changed by the added discharge channel 8, so that the sediment is discharged in the direction away from the mechanical seal 4, which is more conducive to maintaining a relatively clean and stable liquid environment for the mechanical seal 4 to operate.
[0031] In practical applications, another mechanical seal 4 is set at the outer end of the motor base 3 (i.e. the end facing the motor) for a second shaft seal to prevent liquid leaking from the water pump from entering the motor, which helps protect the motor for safe operation.
[0032] Next, the above technical solution will be explained in detail:
[0033] In practical applications, the bottom of the mechanical seal 4 sand-blocking structure is provided with a discharge channel 8. The inner end of the discharge channel 8 is connected to the deposition channel 7, and the outer end is located on the outer wall of the mechanical seal 4 sand-blocking structure. The discharge channel 8 is horizontally arranged, or it is inclined with the inner end higher than the outer end. The discharge channel 8 is used to change the direction of the discharged sediment, discharging the sediment deposited in the deposition channel 7 radially outward in a direction away from the mechanical seal 4, which further helps to maintain a relatively clean and stable liquid environment for the mechanical seal 4 during operation.
[0034] The discharge channel 8 can be horizontally radially outward, or it can be radially outward while simultaneously tilting downward. When the discharge channel 8 is tilted downward, it can make full use of the weight of the sediment, thereby improving the discharge efficiency. Of course, if the discharge channel 8 is tilted upward, it also falls within the scope of protection of this technical solution.
[0035] In practical applications, the sand-blocking structure of the mechanical seal 4 includes a sand-proof cover 9 covering the outside of the mechanical seal 4 and a sand settling cylinder 10 sleeved around the sand-proof cover 9. The sand-proof cover 9 and the sand settling cylinder 10 are spaced apart through the sedimentation channel.
[0036] In this technical solution, the lower end of the sedimentation cylinder 10 is fitted with the motor base 3. The sedimentation cylinder 10 and the motor base 3 can be separate structures or integrated structures.
[0037] In this embodiment, an integrated structure is preferred, which helps to reduce the number of parts and facilitates production, processing, assembly and maintenance.
[0038] In this technical solution, a shaft hole is provided at the top of the sand shield 9, and the rotating shaft passes through the shaft hole on the sand shield 9. The sand shield 9 is fixedly connected to the rotating shaft, and the sand shield 9 rotates together with the rotating shaft, which is conducive to the discharge of mud and sand entering the sedimentation channel 7, and avoids the possibility that mud and sand will accumulate in the sedimentation channel 7 and cannot be discharged in time, and will be squeezed into the mechanical seal 4 or the gap between the mechanical seal 4 and the rotating shaft.
[0039] In practical applications, the outer wall of the sand cover 9 is provided with at least one outwardly protruding stirring structure 11. The stirring structure 11 is located in the sedimentation channel 7. The outer end of the stirring structure 11 is in clearance fit with the inner wall of the sedimentation cylinder 10. The stirring structure 11 has a circumferential stirring surface, which is used to make the fluid and sediment in the sedimentation channel rotate circumferentially, which is conducive to timely and rapid discharge and avoids accumulation.
[0040] To further enhance the mixing effect, the length of each mixing structure 11 is the same as the length of the sand shield 9.
[0041] In practical applications, the stirring structure 11 is often axially uniformly distributed in several parts.
[0042] In practical applications, the stirring structure 11 and the sand cover 9 are an integral structure, and the stirring structure 11 is a blade or a rib.
[0043] In the accompanying drawings of this specification, the ribs are represented. However, those skilled in the art would recognize that the blade design could also be implemented based on the information disclosed herein and in the accompanying drawings. To avoid redundancy, the corresponding structural diagrams are omitted.
[0044] In practical applications, the inner wall of the sedimentation cylinder 10 is provided with an axially downward spiral sand guide groove 12. The inner side of the sand guide groove 12 is connected to the sedimentation channel 7, which is used to spirally deposit the mud and sand between the sand shield 9 and the sedimentation cylinder 10 downward.
[0045] In practical applications, a collecting groove ring 13 is provided between the motor base 3, the sand cover 9 and the sedimentation cylinder 10. The collecting groove ring 13 is connected to the discharge channel of the sedimentation channel 7 and the sand-blocking structure of the mechanical seal 4.
[0046] In this technical solution, the arrangement of the collecting trough ring 13 is beneficial for buffering the sediment falling into the sedimentation channel 7, facilitating its entry into the discharge channel, and making it easier for the discharge channel to change the direction of sediment flow, thereby improving discharge efficiency.
[0047] In practical applications, a convex ring 14 is provided on the motor base 3. The upper end of the convex ring 14 corresponds to and cooperates with the lower end of the sand cover 9. The outer diameter of the convex ring 14 is smaller than the outer diameter of the sand cover 9. The convex ring 14 is located in the inner cavity of the sand settling cylinder 10. The collecting groove ring 13 is located between the convex ring 14 and the sand settling cylinder 10.
[0048] In this technical solution, the convex ring 14 facilitates the formation of the collecting groove ring 13. The collecting groove ring 13 also facilitates the setting of the sand guiding groove 12 on the inner wall of the sand settling cylinder 10. At the same time, it can also prevent the accumulation of mud and sand at the stationary ring 5 and the moving ring 6 of the mechanical seal 4, thereby helping to prevent mud and sand from entering the interior of the mechanical seal 4 and further protecting the mechanical seal 4.
[0049] like Figure 6 As shown, in practical applications, in order to further improve the sand-proof effect, a retaining ring 15 is provided at the lower end of the sand-proof cover 9. The lower end of the retaining ring 15 extends beyond the mating surface between the lower end of the sand-proof cover 9 and the convex ring 14, and extends into the collecting groove ring 13. The retaining ring 15 is used to prevent mud and sand from entering the gap between the sand-proof cover 9 and the convex ring 14, that is, the gap between the stationary ring 5 and the moving ring 6 of the mechanical seal 4.
[0050] In practical applications, the stationary ring 5 of the mechanical seal 4 is set in the motor base 3, the upper end of the stationary ring 5 is flush with the upper end of the convex ring 14, and the upper end of the sand cover 9 is higher than the upper end of the sand settling cylinder 10.
[0051] In other words, the upper end of the collecting groove ring 13 corresponds to the upper end of the convex ring 14, which helps the sediment to be deposited smoothly in the collecting groove ring 13 and prevents the sediment from entering the mechanical seal 4 through the gap between the convex ring 14 and the sand cover 9.
[0052] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Various modifications and variations can be made to the above embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A water pump with a mechanical seal sand-blocking structure, comprising a motor (1), a pump body (2), and a motor mount (3) connecting the motor (1) and the pump body (2), wherein a rotating shaft on the motor (1) passes through the motor mount (3) and is connected to an impeller inside the pump body (2), and a mechanical seal (4) is provided between the rotating shaft and the motor mount (3), the mechanical seal (4) fitting with the inner cavity of the motor mount (3), characterized in that... The outer side of the mechanical seal (4) is covered with a mechanical seal sand-blocking structure, which has a sedimentation channel (7). The mechanical seal sand-blocking structure is used to prevent external mud and sand from entering the mechanical seal (4) and the gap between the mechanical seal (4) and the rotating shaft. The sedimentation channel (7) is used to deposit the mud and sand that enters the mechanical seal sand-blocking structure and discharge it.
2. The water pump having a mechanical seal sand blocking structure according to claim 1, characterized in that The bottom of the mechanical seal sand-blocking structure is provided with a discharge channel (8). The inner end of the discharge channel (8) is connected to the sedimentation channel (7), and the outer end is located on the outer wall of the mechanical seal sand-blocking structure. The discharge channel (8) is set horizontally, or the discharge channel (8) is set inclined with the inner side higher than the outer side.
3. The water pump having a mechanical seal sand blocking structure according to claim 1 or 2, characterized by The mechanical seal sand-blocking structure includes a sand-proof cover (9) covering the outside of the mechanical seal (4) and a sand-sinking cylinder (10) sleeved around the sand-proof cover (9). The sand-proof cover (9) and the sand-sinking cylinder (10) are spaced apart through the sedimentation channel (7).
4. The water pump having a mechanical seal sand retaining structure according to claim 3, characterized by The outer wall of the sand cover (9) is provided with at least one outwardly protruding stirring structure (11). The stirring structure (11) is located in the sedimentation channel (7). The outer end of the stirring structure (11) is in clearance fit with the inner wall of the sedimentation cylinder (10). The stirring structure (11) has a circumferential stirring surface for causing the fluid and sediment in the sedimentation channel (7) to rotate circumferentially.
5. The water pump having a mechanical seal sand retaining structure according to claim 4, characterized by The stirring structure (11) and the sand cover (9) are an integral structure, and the stirring structure (11) is a blade or a rib.
6. The water pump having a mechanical seal sand retaining structure according to claim 3, characterized by The inner wall of the sedimentation cylinder (10) is provided with an axially downward spiral sand guide groove (12), the inner side of which is connected to the sedimentation channel (7) to spirally deposit the mud and sand between the sand cover (9) and the sedimentation cylinder (10).
7. The water pump with an mechanical seal sand-blocking structure according to claim 3, characterized in that... A collecting groove ring (13) is provided between the motor base (3), the sand cover (9) and the sedimentation cylinder (10). The collecting groove ring (13) is connected to the sedimentation channel (7) and the discharge channel of the mechanical seal sand-blocking structure.
8. The water pump having a mechanical seal sand retaining structure according to claim 7, characterized by A convex ring (14) is provided on the motor base (3). The upper end of the convex ring (14) is correspondingly engaged with the lower end of the sand cover (9). The outer diameter of the convex ring (14) is smaller than the outer diameter of the sand cover (9). The convex ring (14) is located in the inner cavity of the sand settling cylinder (10). The collecting groove ring (13) is located between the convex ring (14) and the sand settling cylinder (10).
9. The water pump having a mechanical seal sand retaining structure according to claim 8, characterized by The lower end of the sand cover (9) is provided with a retaining ring (15). The lower end of the retaining ring (15) extends beyond the mating surface between the lower end of the sand cover (9) and the convex ring (14) and extends into the collecting groove ring (13). The retaining ring (15) is used to prevent mud and sand from entering the gap between the sand cover (9) and the convex ring (14).
10. The water pump having a mechanical seal sand retaining structure according to claim 9, characterized by The stationary ring (5) of the mechanical seal (4) is located in the motor base (3). The upper end of the stationary ring (5) is flush with the upper end of the convex ring (14). The upper end of the sand cover (9) is higher than the upper end of the sand settling cylinder (10).