Created on 07.28
Slurry Pump Parts Lantern Ring
In the shaft seal system of slurry pumps, the packing ring is a key component that integrates sealing, lubrication, and cooling functions. As an annular structure arranged around the rotating shaft, it plays a stable role in high-abrasive, high-concentration slurry transportation scenarios through precise structural design and material selection, becoming an "invisible guardian" to ensure the efficient operation of the pump. Whether in the continuous operation of mine tailings transportation or the high-pressure working conditions of metallurgical slag treatment, the packing ring, with its unique functional design, provides continuous and reliable support for the shaft seal part of the slurry pump.
Structural Design: A Carrier for Shaft-Fitting Sealing and Medium Conduction
The structural design of the slurry pump packing ring always focuses on "adapting to the rotating shaft and efficient conduction". It usually adopts an annular or sleeve-like structure, with the inner wall closely fitting the rotating shaft, ensuring that when the shaft rotates at high speed, it can reduce gap leakage while avoiding wear caused by excessive friction. The uniformly distributed through-holes on the ring body are its iconic design — these holes are not simple openings but medium conduction channels calculated by hydrodynamics, which can accurately guide media such as lubricating grease and cooling water to the sealing surface and balance the pressure at the shaft seal.
For different types of slurry pumps, the size and hole diameter of the packing ring are customized according to parameters such as shaft diameter and working pressure. For example, the packing ring used in heavy-duty mining slurry pumps has a thicker ring body and slightly wider through-holes to adapt to the flow needs of high-viscosity lubricating grease; while the packing ring used in light slurry pumps in the chemical industry may adopt a thin-walled design with more densely distributed through-holes, facilitating rapid conduction of cooling media. This customized structural design ensures that the packing ring can perfectly match pumps and shafts of different specifications, providing a basic guarantee for the shaft seal system.
In terms of cooperation with other components, the outer surface of the packing ring is usually precision-machined to form a tight fit with components such as the pressure reducing cover and packing. When the packing is compressed by the gland, the packing ring uses its rigid support to prevent excessive deformation of the packing, and at the same time, uses its annular structure to evenly transmit pressure to the entire sealing surface, preventing leakage caused by excessive local gaps. This dual structural role of "support + conduction" makes the packing ring a key link connecting the rotating shaft and external sealing components in the shaft seal system.
Core Functions: The Triple Role of Sealing, Lubrication, and Cooling
Sealing is the primary function of the packing ring. During the operation of the slurry pump, the gap between the rotating shaft and the pump casing is the main channel for medium leakage. The packing ring, in cooperation with the packing, forms multiple sealing barriers. When the slurry tries to leak from the gap, the packing ring blocks the medium flow through the fitting surface with the rotating shaft, and at the same time, the sealing water introduced through the through-holes forms a "water film" in the gap, further enhancing the sealing effect. This combination of "physical barrier + water film sealing" can effectively resist the infiltration pressure of high-concentration slurry and minimize leakage.
The lubrication function is crucial for extending the service life of the rotating shaft and sealing components. When the rotating shaft of the slurry pump rotates at high speed, friction with components such as packing generates a lot of heat. Insufficient lubrication can easily lead to accelerated wear or even jamming of the sealing surface. The packing ring uniformly delivers lubricating grease to the friction surface through the through-holes of the ring body, forming a continuous lubricating film — the grease remains fluid under the heat generated by friction, which can reduce direct metal-to-metal contact and buffer the impact caused by shaft vibration. For pumps transporting high-temperature slurry, the packing ring can also take away part of the heat through the circulation of lubricating grease, indirectly reducing the temperature of the friction surface.
The cooling function addresses the problem of heat accumulation under high-load working conditions. In slurry transportation in industries such as metallurgy and electric power, the slurry temperature often exceeds 80°C. The heat generated by friction of the rotating shaft, combined with the heat conducted by the medium, may cause the temperature of the shaft seal part to rise sharply, thereby affecting the performance of the sealing material. At this time, the through-holes of the packing ring become channels for cooling water: after entering the sealing surface through the through-holes, the cooling water absorbs heat through heat exchange and then is discharged from the gap between the ring body and the pump casing, forming a continuous cooling cycle. This active cooling method can control the temperature of the sealing surface within the tolerance range of the sealing material, avoiding seal failure due to high temperature.
Material Selection: Considerations for Wear Resistance and Corrosion Resistance Adapting to Working Conditions
The material selection of the slurry pump packing ring needs to comprehensively consider factors such as the characteristics, temperature, and pressure of the transported medium. Common materials include 304 stainless steel, 316 stainless steel, ceramics, and polyethylene, each suitable for specific application scenarios.
304 stainless steel is a general choice in the industrial field. It has good mechanical strength and corrosion resistance, suitable for transporting neutral slurry, such as cement slurry in the building materials industry. Its advantages are moderate cost and good processability; it can be made into ring bodies with complex structures through stamping, turning, and other processes, and it is not easy to react with lubricating grease or cooling water at room temperature, with a service life of up to thousands of hours.
316 stainless steel, with the addition of molybdenum on the basis of 304 stainless steel, has significantly improved corrosion resistance, especially suitable for slurry scenarios containing trace chloride ions, such as dredging slurry pumps in coastal areas or low-salt slurry transportation in the chemical industry. In high-temperature working conditions, 316 stainless steel has better stability; even when in long-term contact with media at 80-120°C, it is not prone to material embrittlement or strength reduction, making it a reliable choice for high-demand working conditions.
Ceramic packing rings are characterized by "extreme wear resistance", with a hardness of over HRC60, which can resist the erosion of hard particles in high-abrasive slurry. In scenarios such as mine tailings transportation and metallurgical slag treatment, the wear resistance of ceramic packing rings is 3-5 times that of metal materials, especially suitable for working conditions where the medium contains quartz sand and metal debris. However, ceramic materials are relatively brittle and need to avoid severe collisions during installation, usually used with elastic packing to buffer vibration.
Polyethylene packing rings are characterized by "chemical resistance + low friction", suitable for chemical slurry pumps transporting acidic or alkaline slurry. Their smooth surface has a low friction coefficient with the rotating shaft, reducing grease consumption; at the same time, polyethylene has strong resistance to organic acids, alkalis, and other media, and will not cause ring damage due to chemical erosion. However, due to limited heat resistance, polyethylene packing rings are usually used in working conditions with temperatures below 60°C, such as slurry transportation in phosphate fertilizer plants.
Application Combination: Synergistic Working Mechanism with Shaft Seal Components
The shaft seal system of a slurry pump is not the independent function of a single component but a synergistic working system of components such as the packing ring, pressure reducing cover, auxiliary impeller, and packing. The cooperation accuracy between the packing ring and other components directly affects the overall sealing effect, forming a "multiple protection" operation mechanism.
In cooperation with the pressure reducing cover, the packing ring is located between the pressure reducing cover and the packing, and evenly transmits the pressure of the pressure reducing cover to the packing through its annular structure. When the pressure reducing cover adjusts the pressing force through threads, the packing ring acts like a "buffer pad" to avoid pressure concentration, and at the same time, uses its rigidity to limit the radial deformation of the packing, ensuring the fitting degree of the sealing surface. When the internal pressure of the pump fluctuates, the pressure reducing cover transmits compensation pressure to the packing through the packing ring, maintaining the pressure stability of the sealing surface. This cooperation of "pressure transmission + compensation" allows the shaft seal system to maintain sealing performance under variable working conditions.
The combination with the auxiliary impeller reflects the dual strategy of "active leakage prevention + passive sealing". The auxiliary impeller 甩 s part of the slurry back to the pump cavity through the centrifugal force generated by rotation, reducing the medium pressure at the shaft seal part, while the packing ring further blocks the leakage of residual medium on the low-pressure side. At this time, the through-holes of the packing ring introduce a small amount of sealing water, forming a "water seal barrier" between the auxiliary impeller and the packing — which not only prevents reverse infiltration of the slurry but also lubricates the auxiliary impeller shaft sleeve. This combination is particularly suitable for high-concentration slurry transportation, which can significantly reduce the wear rate of sealing components.
The packing, as a sealing component in direct contact with the rotating shaft, has a closer cooperation with the packing ring. When the packing wears and forms gaps, the packing ring fills the gaps with lubricating grease through the through-holes and guides cooling water to flow through the worn parts to delay packing failure. When replacing the packing, the packing ring can also serve as a positioning reference to ensure the accurate installation position of the new packing, avoiding local wear caused by offset. This cooperation of "real-time compensation + installation positioning" extends the service life of the packing by more than 30%.
Practical Applications: Adapting to Working Conditions in Multiple Industries
In mine tailings transportation in the mining industry, slurry pumps need to withstand continuous erosion of high-concentration slag slurry, and 316 stainless steel packing rings are the most suitable choice. The ring body delivers high-viscosity lubricating grease through through-holes, forming a wear-resistant lubricating film between the rotating shaft and the packing; at the same time, cooling water flows through the through-holes of the ring body to take away friction heat, preventing slag particles from scaling and blocking the sealing surface due to high temperature. With this configuration, the packing ring can work stably for 3-6 months under high-intensity working conditions with an average daily operation of 20 hours, significantly reducing downtime for maintenance.
Slag treatment pumps in the metallurgical industry often work in high-temperature, high-abrasive environments, making ceramic packing rings the first choice. Their high hardness resists the erosion of metal debris in slag, and the through-hole design of the ring body is optimized for high temperatures — cooling water flows rapidly in the through-holes, controlling the temperature of the sealing surface within the tolerance range of ceramics; at the same time, lubricating grease is delivered through a dedicated channel to avoid carbonization and loss of lubrication due to high temperature. In alumina slurry transportation in aluminum plants, the combination of ceramic packing rings and auxiliary impellers can control the shaft seal leakage to below 0.1L/h, meeting environmental emission requirements.
Coal washing slurry pumps in the coal industry face mixed media of coal slime particles and water, and polyethylene packing rings are suitable for this working condition due to their wear resistance and low friction. The lubricating grease guided by the through-holes of the ring body can form a protective film before coal slime adheres, preventing coal slime from caking and blocking the sealing surface; at the same time, the water resistance of polyethylene ensures that the ring body will not rust due to long-term contact with water. When used with a pressure reducing cover, this combination can adapt to pressure fluctuations during coal washing, ensuring the stability of continuous washing operations.
In ash and slag transportation in the power industry, slurry pumps need to handle high-temperature fly ash slurry, and the combination of 304 stainless steel packing rings and mechanical seals has become the standard configuration. The through-holes of the packing ring directly introduce cooling water into the sealing surface, reducing the adhesion probability of fly ash particles; at the same time, lubricating grease is evenly distributed through annular grooves to provide continuous lubrication for the rotating shaft. This design can maintain sealing performance at a working temperature of 120°C, helping power plants achieve harmless treatment of ash and slag.
Maintenance and Replacement: Practical Points for Extending Service Life
Regular inspection is the basis for ensuring the continuous function of the packing ring. During daily operation, it is necessary to observe the leakage volume of the shaft seal part: if the leakage suddenly increases, it may be that the through-holes of the packing ring are blocked or the ring body is worn; if abnormal heating occurs, it may be that the through-holes fail to effectively conduct cooling media. During shutdown inspection, the pressure reducing cover should be dismantled to check the surface of the packing ring — if cracks, blocked through-holes, or excessive inner wall wear are found, it should be replaced in time. For continuously operating slurry pumps, a comprehensive inspection is recommended every 1500 hours to detect potential faults in advance.
When replacing the packing ring, attention should be paid to the cooperation accuracy with related components. Before installation, the surface of the rotating shaft should be cleaned of wear particles and residual packing to ensure that the fitting gap between the inner wall of the packing ring and the rotating shaft is within 0.1-0.3mm; during installation, special tools should be used for positioning to avoid uneven pressure distribution caused by ring body tilt. After replacement, a test run is required: first run at low speed for 5 minutes to observe the temperature and leakage of the sealing surface, then gradually increase to the working speed to ensure that the packing ring works synergistically with other components.
In daily maintenance, the through-holes of the packing ring should be cleaned regularly according to working conditions. For high-viscosity slurry transportation, clean lubricating oil should be injected through a dedicated channel every week to flush residual media in the through-holes; for working conditions with more particles, the blockage of through-holes should be checked monthly and cleaned with compressed air or a soft brush. At the same time, the selection of lubricating grease and cooling media should match the material of the packing ring — for example, ceramic rings should be paired with high-temperature lubricating grease, and polyethylene rings need to use special chemical-resistant lubricating grease to avoid ring damage due to media incompatibility.
Slurry Pump Lantern Ring Parts Code List:
AH Slurry Pumps | Slurry Pump Materials |
B063 | 1.5/1B-AH, 2/1.5B-AH |
C063 | 3/2C-AH, 4/3C-AH |
D063 | 4/3D-AH, 6/4D-AH |
E063 | 6/4E-AH, 8/6E-AH, 8/6R-AH |
G063 | 10/8F-AH, 10/8ST-AH, 12/10ST-AH, 14/12ST-AH |
H063 | 16/14TU-AH, 18/16TU-AH, 20/18TU |
Slurry Pump Lantern Ring Code | HH Slurry Pumps |
CH063 | 1.5/1C-HH |
D063 | 3/2D-HH |
E063 | 4/3E-HH |
F063 | 6/4F-HH |
Slurry Pump Lantern Ring Code | M Slurry Pumps |
E063 | 10/8E-M, 10/8R-M |
Slurry Pump Lantern Ring Code | L Slurry Pumps |
A063 | 20A-L |
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The parts manufactured by us are not associated with, endorsed by, or sponsored or manufactured by the owners of the related trade marks given into this website or other documents.
Any use of OEM names, trademarks or other information is for reference only.
Hedunpump Is not affiliated nor a distributor for any pumps company.
The parts manufactured by us are not associated with, endorsed by, or sponsored or manufactured by the owners of the related trade marks given into this website or other documents.
Any use of OEM names, trademarks or other information is for reference only.
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