CN215256953U - Flushing and cooling structure for mechanical seal of large dredge pump - Google Patents
Flushing and cooling structure for mechanical seal of large dredge pump Download PDFInfo
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- CN215256953U CN215256953U CN202121068701.0U CN202121068701U CN215256953U CN 215256953 U CN215256953 U CN 215256953U CN 202121068701 U CN202121068701 U CN 202121068701U CN 215256953 U CN215256953 U CN 215256953U
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Abstract
The utility model discloses a flushing and cooling structure for mechanical seal of a large dredge pump, which comprises a seal box, a spring seat, a shaft sleeve, a static seal assembly, a dynamic seal assembly and a seal end cover; a sealing component which is in sealing fit with the shaft sleeve is arranged at the right end of the sealing end cover; forming a closed external washing cooling sealing cavity at the outer sides of the dynamic sealing ring and the static sealing ring; a water inlet hole and a water outlet hole are formed on the sealing end cover corresponding to the outer washing and cooling sealing cavity; the sealing assembly comprises a sealing component arranged between a sealing end cover and a shaft sleeve, and the sealing component is in sealing fit with the outer surface of the shaft sleeve; and a sealing pressure plate is arranged on the outer side of the sealing end cover through a fastener, and the sealing pressure plate is arranged on the outer surface of the sealing end cover through a fastener. The external washing cooling seal cavity can wash and cool the dynamic/static seal ring and take away friction debris, so that the mechanical seal operation environment is improved, and the service life of the seal element is prolonged; the reliability and the service life of the mud pump shaft seal are improved, the design performance of the mud pump is ensured, and the mud pump can run reliably; in addition, the outer washing cooling seal cavity can also collect main seal leakage media and discharge the media through the water outlet hole, so that the auxiliary sealing effect is achieved.
Description
Technical Field
The utility model belongs to mechanical seal device especially relates to a large-scale dredge pump mechanical seal is with washing cooling structure.
Background
The logistics industry relying on water transportation is developed rapidly in vast rivers, lakes and seas of China, but the problem of channel siltation of rivers, lakes and seas which troubles the shipping industry for a long time is particularly prominent in recent years, and channel desilting work is emphasized by each channel bureau. In the dredging of a plurality of channels in China every year, the economic loss caused by shutdown caused by the leakage of the sealing of the dredger is astronomical number, so the sealing on the dredge pump of the dredger is a node of the whole dredging work. The maintenance, the disassembly and the assembly of large-scale equipment are time-consuming and long in period, the utilization rate of the equipment is reduced, a large amount of maintenance capital is consumed, a lot of precious time is wasted, the direct economic loss caused by stopping each dredge pump for one day is millions of yuan, and the indirect economic loss is immeasurable.
The same problem also exists in some shipping countries abroad, and the sealing device of the current foreign dredge pump generally adopts an L-shaped rubber sealing structure form, such as: for dredge pumps produced by companies such as the Netherlands, Germany and the like, L-shaped rubber sealing structures are used for sealing pump shafts. The seal has certain use requirements in engineering application, such as pressure requirement lower than 3MPa, linear velocity lower than 10m/s and the like, and the common imported L-shaped rubber seal can be used for more than half a year. For example, the working condition of slurry conveying of a pump is severe, the sealing leakage rate is increased rapidly, severe abrasive wear frequently occurs, and meanwhile, the shaft sleeve is also subjected to severe abrasive wear, so that the sealing is ineffective, particularly under the high-pressure working condition (P is more than 3MPa), the service life of the pump is generally from several hours to several days, the use effect is very unsatisfactory, and the construction progress is seriously influenced.
The large mechanical seal in the prior art generally has no problem existing in the process of flushing a cooling space;
1. the large mechanical seal has poor heat exchange performance, the continuous operation temperature of the dynamic and static seal rings rises, the vaporization of a lubricating film on the sealing end surface can be caused, the dry friction is caused on the two end surfaces, and the generated friction heat is large, so that the abrasion is intensified and thermal stress cracks are caused to break or even crack the seal rings.
2. Thermal deformation can occur if the dynamic and static seal ring temperatures exceed the material's ultimate service temperature, and thermal stress cracks can also occur under sudden loading, causing seal failure and thus seal failure.
3. The temperature rise of the dynamic sealing ring and the static sealing ring can also exceed the allowable value of the auxiliary sealing ring, so that the failure of the sealing ring is caused.
Therefore, the utility model provides a can in time clear up, can reduce sound seal assembly and dynamic seal assembly operating temperature's large-scale dredge pump mechanical seal simultaneously and use washing and cooling structure.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a can in time clear up, can reduce sound seal assembly and dynamic seal assembly operating temperature's large-scale dredge pump mechanical seal simultaneously and use washing and cooling structure.
The utility model is realized in such a way that the mechanical seal washing and cooling structure for the large dredge pump is characterized in that the mechanical seal device is arranged on the pump shaft and comprises a seal box, a spring seat and a shaft sleeve which are arranged in the seal box and arranged on the pump shaft, a static seal assembly and a dynamic seal assembly which are arranged between the seal box and the shaft sleeve, and a seal end cover for installing the right end of the seal box; the method is characterized in that: the left end of the seal box is provided with a separation sleeve for preventing large granular media from entering the periphery of the movable and static seal rings through a fastener, a gap is reserved between the separation sleeve and a movable ring seat of the movable ring seal assembly, an inner flushing cavity which is open towards the interior of the pump is formed between the separation sleeve, the seal box and the movable ring seat, and the seal box is provided with a water inlet communicated with the inner flushing cavity.
Preferably, the sealing member is a packing seal assembly or an L-shaped seal assembly.
Preferably, a sealing assembly in sealing fit with the shaft sleeve is mounted at the right end of the sealing end cover; forming a closed external washing cooling sealing cavity at the outer sides of the dynamic sealing ring and the static sealing ring; a water inlet hole and a water outlet hole are formed on the sealing end cover corresponding to the outer washing and cooling sealing cavity; the sealing assembly comprises a sealing component arranged between a sealing end cover and a shaft sleeve, and the sealing component is in sealing fit with the outer surface of the shaft sleeve; and a sealing pressure plate is arranged on the outer side of the sealing end cover through a fastener, and the sealing pressure plate is arranged on the outer surface of the sealing end cover through a fastener.
Preferably, a gap of 1mm-6mm is reserved between the blocking sleeve and the movable ring seat of the movable ring sealing assembly.
The utility model has the advantages and positive effects that: because the utility model discloses an install the spacer sleeve at the left end of seal box (being particle medium end), effectively prevented the large granule medium to get into around moving, quiet sealing ring, seal box flushing hole inlet pressure is higher than medium pressure 0.05-0.1Mpa simultaneously, further prevents around the medium particulate matter gets into the sealing ring, forms clean cavity around the sealing ring, has optimized the mechanical seal environment.
The external washing cooling seal cavity of the utility model can wash and cool the dynamic/static seal ring, and take away friction debris, thereby improving the mechanical seal operation environment and further prolonging the service life of the seal element; the reliability and the service life of the mud pump shaft seal are improved, the design performance of the mud pump is ensured, and the mud pump can run reliably; in addition, the outer washing cooling seal cavity can also collect main seal leakage media and discharge the media through the water outlet hole, so that the auxiliary sealing effect is achieved.
Drawings
FIG. 1 is a schematic structural diagram of embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
In the figure, 1, a pump shaft; 2. a sealing box; 3. a spring seat; 4. a shaft sleeve; 5. a static seal assembly; 6. a dynamic seal assembly; 7. sealing the end cap; 8. a seal assembly; 8-1, a sealing member; 8-2, sealing a pressure plate; 9. externally washing and cooling the sealed cavity; 10. a water inlet hole; 11. a water outlet hole; 12. a barrier sleeve; 13. an inner flushing cavity; 14. a water inlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1, please refer to fig. 1; a washing and cooling structure for the mechanical seal of a large dredge pump is characterized in that a mechanical seal device is arranged on a pump shaft 1 and comprises a seal box 2, a spring seat 3 and a shaft sleeve 4 which are arranged on the pump shaft and positioned in the seal box, a static seal assembly 5 and a dynamic seal assembly 6 which are positioned between the seal box and the shaft sleeve, and a seal end cover 7 for installing the right end of the seal box; the left end of the seal box is provided with a separation sleeve 12 for preventing large granular media from entering the periphery of the movable and static seal rings through a fastener, a gap is reserved between the separation sleeve and a movable ring seat of the movable ring seal assembly, an inner flushing cavity 13 which is open towards the inside of the pump is formed between the separation sleeve, the seal box and the movable ring seat, and the seal box is provided with a water inlet 14 communicated with the inner flushing cavity. Preferably, a gap of 1mm-6mm is reserved between the blocking sleeve and the movable ring seat of the movable ring sealing assembly. The design of the blocking sleeve effectively prevents large granular media from entering the periphery of the movable sealing ring and the static sealing ring, and meanwhile, the water inlet pressure of the flushing hole of the sealing box is 0.05-0.1Mpa higher than the pressure of the media, so that the media particles are further prevented from entering the periphery of the sealing ring, a clean chamber is formed around the sealing ring, and the mechanical sealing environment is optimized.
Preferably, the sealing member is a packing seal assembly or an L-shaped seal assembly. Adopt above-mentioned seal assembly simple structure, adopt among the prior art use relatively mature, the reliable L type rubber seal component of sealing performance as supplementary seal component under the low pressure environment, increased sealed reliability, also do benefit to advantages such as later stage maintenance and change simultaneously, above-mentioned L type rubber seal component also can adopt current packing seal assembly simultaneously.
Example 2, please refer to fig. 2; a sealing component 8 which is in sealing fit with the shaft sleeve is arranged at the right end of the sealing end cover; a closed external washing cooling seal cavity 9 is formed at the outer sides of the dynamic seal ring and the static seal ring; a water inlet hole 10 and a water outlet hole 11 are formed on the sealing end cover corresponding to the outer washing and cooling sealing cavity; the sealing assembly comprises a sealing component 8-1 arranged between a sealing end cover and the shaft sleeve, and the sealing component is in sealing fit with the outer surface of the shaft sleeve; and a sealing pressure plate 8-2 is arranged on the outer side of the sealing end cover through a fastener, and the sealing pressure plate is arranged on the outer surface of the sealing end cover through a fastener.
To sum up, the utility model adopts the above technical scheme, promoted dredge pump mechanical seal's reliability and life, guaranteed the design performance of dredge pump, made dredge pump reliable operation.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A washing and cooling structure for the mechanical seal of a large dredge pump is characterized in that a mechanical seal device is arranged on a pump shaft and comprises a seal box, a spring seat and a shaft sleeve which are arranged on the pump shaft and positioned in the seal box, a static seal assembly and a dynamic seal assembly which are positioned between the seal box and the shaft sleeve, and a seal end cover for installing the right end of the seal box; the method is characterized in that: a blocking sleeve for preventing large granular media from entering the periphery of the movable sealing ring and the static sealing ring is arranged at the left end of the sealing box through a fastening piece, a gap is reserved between the blocking sleeve and a movable ring seat of the movable ring sealing assembly, and an inner washing cavity which is opened towards the inside of the pump is formed among the blocking sleeve, the sealing box and the movable ring seat; and the seal box is provided with a water inlet communicated with the inner flushing cavity.
2. The washing and cooling structure for the mechanical seal of the large dredge pump according to claim 1, characterized in that: the sealing member is a packing seal assembly or an L-shaped seal assembly.
3. The washing and cooling structure for the mechanical seal of the large dredge pump according to claim 1, characterized in that: a sealing component which is in sealing fit with the shaft sleeve is arranged at the right end of the sealing end cover; forming a closed external washing cooling sealing cavity at the outer sides of the dynamic sealing ring and the static sealing ring; a water inlet hole and a water outlet hole are formed on the sealing end cover corresponding to the outer washing and cooling sealing cavity; the sealing assembly comprises a sealing component arranged between a sealing end cover and a shaft sleeve, and the sealing component is in sealing fit with the outer surface of the shaft sleeve; and a sealing pressure plate is arranged on the outer side of the sealing end cover through a fastener, and the sealing pressure plate is arranged on the outer surface of the sealing end cover through a fastener.
4. The washing and cooling structure for the mechanical seal of the large dredge pump according to claim 1, characterized in that: and a gap of 1mm-6mm is reserved between the blocking sleeve and the movable ring seat of the movable ring sealing assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121068701.0U CN215256953U (en) | 2021-05-18 | 2021-05-18 | Flushing and cooling structure for mechanical seal of large dredge pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121068701.0U CN215256953U (en) | 2021-05-18 | 2021-05-18 | Flushing and cooling structure for mechanical seal of large dredge pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215256953U true CN215256953U (en) | 2021-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121068701.0U Active CN215256953U (en) | 2021-05-18 | 2021-05-18 | Flushing and cooling structure for mechanical seal of large dredge pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215256953U (en) |
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2021
- 2021-05-18 CN CN202121068701.0U patent/CN215256953U/en active Active
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