The ZJL type non-blocking submersible slurry pump is a vertical, single-stage single-suction, long-shaft submersible, cantilevered heavy-duty slurry pump. It is suitable for transporting solid particles and corrosive slurry.

Product structure diagram

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Structural Characteristics

Lengthened drive shaft: 40Cr quenched and tempered, segmented (intermediate coupling + guide sleeve is often used when the liquid depth is over 2 meters, for convenient disassembly), shaft diameter is calculated based on the length of the cantilever and the radial pulsation; the deeper the liquid, the more rigid the shaft needs to be.
Liquid protection sleeve / casing: replaceable, high-chromium Cr26 or wear-resistant rubber (selected based on the abrasion/corrosion of the medium), the inner wall of the sleeve is the "friction surface" of the slurry, after wear, the sleeve is replaced without changing the shaft - this is the cost-saving point of ZJL compared to the old liquid submersible pumps.
Bearings assembly (above liquid): radial rollers + thrust balls / thrust rollers combination (axial force of the cantilever + radial force need to be borne, especially during startup, instantaneous axial force), grease lubricated small machine, thin oil medium-depth liquid submersible; bearing seat with oil level sight glass + temperature measurement (large machine).
Impeller (non-clogging model):
Single flow channel: one wide channel of blades, the material passing through is the strongest, the efficiency is medium, suitable for coarse particles + slightly higher concentration
Double flow channel: two blades, the material passing through is still strong, the efficiency is 3%–5% higher than the single flow channel, the most commonly used
Vortex type: circular flow channel, the impeller does not directly touch the solid, it relies on the vortex to carry out, friendly to hard coarse particles + short fibers, the efficiency is low (5%–10% lower than the channel type), but "never clog"
Pump body / volute: HT250 shell + high-chromium liner (Cr26) or full high-chromium; liquid submersible slurry pump volutes have the volute outlet side inclined to the pump seat flange, avoiding the outlet pipe being in the liquid.

Working principle

Power transmission chain: The motor (dry area, IP54/IP55, air-cooled) is above the pump base → coupling (or with an intermediate coupling to extend the shaft) → extended drive shaft → pump head impeller. The bearing housing is on the liquid side, with radial + thrust combined bearings (bearing arm axial + radial support), grease lubrication or oil lubrication (deep submersion / large machine use oil).
Submersible section (without bearings and seals): From the bearing housing downwards, the shaft passes through the sleeve/cover (replaceable with high-chrome or rubber lining), the cover outside is the slurry, but the shaft does not directly touch the slurry - this is the difference between ZJL and "the old-fashioned type of shaft sleeve wear-out and being useless" in submersible pumps, ZJL's cover can be replaced, and with good shaft protection, it can be used for a long time. The submersible section does not have bearings - it relies on the support point at the bearing housing end + sleeve guidance, and the cantilever length is the submersion depth.
Pump head work: The impeller (single/double flow channel or vortex type wide channel) is immersed in the liquid surface, the liquid is sucked in from the side or below of the pump body (no suction head problem, because it is immersed), centrifugal work → volute → outlet flange (the outlet is usually on the side of the pump base, with a flange to connect the outlet pipe).
How "no blockage" comes about: The impeller flow channel is wide + the number of blades is small (3–4 single flow channels, or 2 flow channels, or vortex type 1 ring-shaped flow channel), sand, gravel, crushed ore, ash, slag blocks, short fibers (if the medium has flocculation) can pass through; Vortex type impeller does not directly touch the solid, it relies on the vortex to carry out, the most friendly to hard and coarse particles, but the efficiency is 5%–10% lower than the flow channel type.

Application scenario

Dewatering pit of the concentrator's bottom flow: The concentration of the bottom flow of the concentrator is 30%–50%, with coarse particles (concentrate/ tailings). The depth of the dewatering pit is 1.5–3 meters. The ZJL has a top flange for the pit, and a wide flow channel for pumping out the pressure filtration or for the next process. It is more favored by the operation and maintenance of the concentrator plant compared to the ZJQ underwater "dry zone motor + no pool maintenance".
Bottom discharge of the ash and slag pool/ash and slag silo: The bottom ash/fly ash slurry from the boiler. The depth of the pool is 1–2.5 meters. The ash and slag contain coarse particles and fine ash mixed together. The ZJL has a double-flow channel or vortex type. It continuously discharges for dewatering or into the ash storage; the motor is in the dry zone, and the ash pool is adjacent but with IP55 protection sufficient.
Shallow ash pool/middle coal slurry pool in the coal preparation plant: The concentration of the coal slurry water is 30%–50%. The depth of the pool is 1–2 meters. The ZJL is placed at the top of the pool, with a wide flow channel that does not block coal slag + crushed rock, and is more efficient than ZJ for reducing suction distance and than ZJQ for reducing the pump lowering into the pool.
Discharge of chemical slag trough/reaction tank ash: Ash discharge from the bottom of chemical vessels/slabs (sulfuric acid slag, phosphoric acid slag, titanium white slag). The depth of the tank is 1–3 meters. The medium is often corrosive + abrasive. The ZJL has flow components rising in two phases, with the motor in the dry zone far away from the volatile gas inside the tank, and it is safer than underwater.

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