Internal structure of high-speed propeller

Environment for using submersible thrusters

1. Equipment composition description

Each submersible thruster is equipped with a complete set of accessories, fasteners, spare parts, and required cables for safe, effective, and reliable operation, mainly including: a fully assembled submersible agitator; Supporting submersible motor; Submersible cables for each mixer;

2. Installation method of submersible thruster

The low-speed thruster is submersible and installed horizontally. The thruster can be freely raised and lowered, easily moved, and can be easily removed for inspection or service without the need for personnel to enter the pool or well.

The submersible thruster is a complete set of equipment, including main equipment, installation system, and lifting device. The installation system consists of square steel guide rods, top fixing parts, bottom fixing parts, steering bolts, etc. The mixer can be freely adjusted for lifting and lowering, and can be disassembled and installed without emptying the water tank. By using the steering bolt, the guide rail and mixer can be operated on the platform to rotate at any angle within a 180 degree range of the horizontal plane. The impeller is mounted on a motor support frame that can slide on the guide rod and functions as a whole. The support frame can withstand the entire weight of the agitator and the thrust generated during operation.

The lifting device is movable and installed on the top fixed part of the guide rail system. It is equipped with a dedicated lifting hoist and a bidirectional braking device inside the lifting device. Submersible thrusters are suitable for corrosive environments in sewage. Capable of fully mixing and blending sewage or sludge to ensure the flow rate at the bottom of the tank. The mixer is capable of continuous operation under fully submerged conditions. At the same time, it can also adapt to continuous operation, intermittent operation (up to 20 starts per hour), and resuming operation after a long-term stop.

The submersible thruster can ensure smooth and vibration free operation. All rotating components (including motors) undergo dynamic and static balance tests during manufacturing. Ensure low operation and maintenance costs, high reliability, and long operation time of the mixer.

3. Submersible thruster impeller

The impeller material is fiberglass, and it adopts a non winding self-cleaning design with hydraulic balance. The impeller has efficient hydraulic performance, which can fully stir, mix and promote the flow of sewage at the bottom of the pool.

The impeller is welded as a whole from stainless steel and has undergone dynamic balance testing. A locking device is installed between the impeller and the shaft to prevent loosening during rotation, and the blade design has self-cleaning and vibration free functions.

4. Low speed impeller bearings

The motor shaft of the submersible thruster is supported by two ball bearings, and the propeller shaft is supported by two tapered roller bearings. All bearings use high-quality maintenance free bearings lubricated with grease, which can withstand axial and radial loads.

When the bearing operates within the range of 0.5Qn<Qn<1.25 Qn (Qn is the optimal operating point), the bearing life is over 100000 hours.

5. Thruster motor

The submersible motor is a three-phase squirrel cage induction motor. The protection level of the motor is IEC IP68, the insulation level is F, and it operates at 155 ℃. The rated power of the motor equipped with the submersible thruster ensures that the thruster will not experience overload during use. The motor starts 20 times per hour. The motor shaft and rotor have passed the dynamic and static balance tests. The motor design is applied to work in environments with temperatures higher than 40 ℃ (104F), capable of immersing and continuously stirring liquids with temperatures higher than 40 ℃, and the average temperature rise of the stator winding does not exceed 80 ℃. To monitor the temperature on each phase winding, a thermal switch is installed in the stator winding coil of each phase. The set opening temperature of the thermal switch is 130 ℃, and it is connected to the control cabinet and connected to the control relay.

Both the motor and cable can be used continuously at a depth of up to 20 meters without losing their waterproof performance (compliant with IP68 protection level). Submersible motors can be fully cooled by the surrounding stirring medium without relying on cooling jackets or external cooling systems. In addition, the motor room is filled with insulating oil to ensure excellent insulation and cooling performance. And prevent water leakage from burning the motor.

6. Mechanical seal for submersible thrusters

There is a mechanical seal and two radial sealing rings installed between the impeller hubs. The radial sealing rings are placed on bronze sleeves to provide additional protection for the mechanical seal and facilitate replacement. The shaft seal system includes a sealed oil chamber, in which the mechanical seal is installed and operates. Mechanical seals are maintenance free and can rotate clockwise or counterclockwise without affecting their sealing function. The mechanical seal is made of silicon carbide material, which has good mechanical strength and resistance to thermal shock. The pH range of the medium should be between 4-10.

The design service life of mechanical seals should be greater than 25000 hours.

7. Submarine thruster cables and cable sealing

The motor is equipped with a submersible cable, which is the same cable that includes control and power core wires. Both the motor and cable can be used continuously at a depth of up to 20 meters without losing their waterproof performance.

8. Propeller motor protection

temperature sensor

Three series connected thermal switches (PTO) are installed in the three-phase stator coils of the thruster to monitor the temperature rise of the stator. Activate the alarm device and stop the motor when the protection operates at 130 ℃.

leak sensor

The impeller is equipped with a leakage sensor to detect leaks in the sealed oil chamber, preventing water from leaking into the motor and causing damage. The leakage sensor is an electrode type sensor, and the signal can be monitored by a dedicated protective relay and an alarm signal can be issued when the motor enters water.

The dedicated protection relay for the low-speed submersible thruster receives the alarm signal from the leakage sensor and outputs a fault trip contact to automatically cut off the motor power and stop the motor. The dedicated protective relay for the thruster is installed in the local control box, and its power requirement is AC220V. Special protective relays are provided together with the thruster.

Internal structure of high-speed propellerModel Description

QJB - Low speed thruster (submersible thruster)

1.5- Motor power (KW)

4- Motor level

42-- Impeller diameter (mm)

2-- Number of leaves

1800- Rated speed (r/min)

S/P - Material: S represents stainless steel, P represents polyurethane

The purpose and applicable conditions of QJB low-speed thruster

Low speed thrusters are suitable for various water treatment processes and industrial processes that require maintaining uniform mixing and reaction of solid and liquid two-phase or solid, liquid, and gas three-phase media.

The QJB low-speed thruster can operate continuously under the following conditions:

1. Medium temperature not exceeding 40 ° C

2. The pH value of the medium is between 5-9

3. Medium density not exceeding 115KG/M ^ 3

4. Low speed thrusters operate for long-term diving, with a diving depth generally not exceeding 10 meters

Material of components for submersible thrusters

Spiral propeller: reinforced polyurethane

Gearbox: Cast iron DIN1691 GG25 (ASTM A48 35B)

Motor casing: Cast iron DIN1691 GG25 (ASTM A48 35B)

Shaft: Stainless steel

Mechanical seal: silicon carbide/silicon carbide fastener: stainless steel AISI 316 cable jacket: chloroprene rubber

O-ring: Nitrile or Fluororubber Thruster Bracket: Stainless Steel AISI 304

Guide rail system: Stainless steel AISI 304

Lifting Steel Cable: Stainless Steel AISI 3164

Lifting arm of lifting device: stainless steel AISI304

Chemical anchor bolt: stainless steel

Surface anti-corrosion: two-component epoxy resin coating, two layers of primer with a thickness of 100 μ m each, and a topcoat thickness of 120 μ m.

Control of QJB submersible thruster:

The operation mode of submersible thrusters includes two methods: on-site manual control and PLC automatic control.

1. Manual control

Submersible thrusters should be equipped with manual control, which can still be achieved in situations where automatic control is not possible. Namely, when the "selector switch" on the control cabinet panel is placed in the manual control position, the machine can be manually operated on site through the control switch, and the handle control buttons can control the operation of the equipment separately.

2. Automatic control

In the PLC automatic operation mode, the submersible thruster is automatically controlled by time. The submersible mixer operates continuously or intermittently.

When the selection switch is set to the fully automatic control position, the machine can operate in the following ways.

Use the start button on the control panel.

Control the time through the control panel.

On site control box for submersible mixer

The on-site control box provided with the equipment meets all design specifications and complies with IEC standards or standards not lower than IEC standards; Meet the local climate conditions.

Each submersible thruster is equipped with an on-site control box. The requirements for the on-site control box are as follows:

(1) In addition to the built-in buttons and signal lights, an additional 35 terminals are added.

(2) Ordering of converters and equipment for internal motor protection.

(3) The start stop button should have two pairs of contacts, and the stop button (with mushroom head) should be able to remain in the pressed position.

(4) In order to ensure a good connection between the on-site control box and the entire plant control system, Weide Miller products are used for the terminals inside the control box..

(5) Equipped with cable connectors.

(6) Protection level: IP65.

(7) Reserved PLC interface, each device requires control from both the on-site control box and the central control room.

(8) On site control box, made of 304 stainless steel outdoors and coated with carbon steel indoors. The box form and coating color are standard

(9) The components inside the control box are made of ABB, Schneider, Siemens or equivalent brands.

Internal structure of high-speed propellerInstallation Instructions

The installation method of a submersible thruster includes the following steps:

(1) Assemble the lower fixing plate 44 in the main guide rod 4 and the lower fixing plate 15 in the auxiliary guide rod I onto the stabilizing body 5 with fasteners, so that the main guide rod 4 and the auxiliary guide rod I are placed vertically, and the three guide rods form a triangle when viewed from above; Two auxiliary guide rods I are symmetrically arranged with the main guide rod 4 as the center, that is, when viewed from above, the three guide rods form an isosceles triangle, with the position of the main guide rod 4 as the vertex;

(2) Place bracket 3 horizontally, and connect the connecting plate 31 of bracket 3 support rod 32 to the connecting plate 43 on the main guide rod 4. Connect the connecting plates at both ends of auxiliary rod 34 to the connecting plates 14 on two auxiliary guide rods I. In this way, bracket 3 is fixed in a T-shape on three guide rods;

(3) Use a lifting system to lift the guide rod and bracket components into the pool and adjust them to the appropriate position;

(4) Fix the upper fixing plates of the main guide rod 4 and the auxiliary guide rod I respectively to the pool wall with expansion bolts;

(5) Lift the submersible thruster body 2 with a lifting system, place the sliding sleeve on the submersible thruster body 2 into the guide rod 42 of the main guide rod 4, and slowly lower it onto the bracket 3. The submersible thruster body 2 is fixed on the bracket 3, so that it is horizontally positioned;

(6) Connect the power supply and start the motor to achieve the desired current pushing effect.

In the system composed of the three guide rods mentioned above, the upper fixing plate of the three guide rods is fixed to the pool wall, and the lower fixing plate is fixed to the stabilizing body 5, so that all structures form a stable whole, effectively resisting the backward axial thrust and overturning moment experienced by the submersible thruster during operation, thereby ensuring the long-term safe and reliable operation of the submersible thruster.

In the system composed of the three guide rods mentioned above, due to the small cross-section of the three guide rods, the flow resistance of sewage is very low, thus achieving the normal operation of the process.

Installation system of QJB low-speed thruster

The installation system of Du'an Environmental Protection Submersible Thruster mainly consists of a chain block, lifting bracket, lifting bracket seat, lifting ring chain, guide rod, limit frame, base, etc. The low-speed impeller moves up and down along the guide rod through the guide wheel, and the lifting bracket is installed on the lifting bracket seat and can rotate 360 ° around its positioning axis for easy installation and maintenance. The limit frame of this installation system is in a "T" shape, with the upper end in contact with the low-speed impeller body and horizontally connected to the guide rod connecting plate with bolts (the guide rod connecting plate is welded to the guide rod after the low-speed impeller position is adjusted correctly), and the lower end is fixed with expansion bolts. To increase the reliability of the low-speed thruster during operation and reduce the vibration during the operation of the submersible low-speed thruster, V-shaped rubber shock absorbers are added to the low-speed thruster and limit frame.

The installation system material of QJB low-speed impeller adopts stainless steel and carbon steel anti-corrosion options;

Ordering instructions for QJB low-speed thruster:

Please provide the following detailed data:

1. The product name and model of QJB low-speed thruster;

2. The impeller speed of QJB low-speed impeller (r/min);

3. QJB low-speed impeller diameter (mm);

4. QJB low-speed thruster motor power (KW);

5. QJB low-speed thruster thrust (N);

6. QJB low-speed thruster material requirements (C-cast iron S-stainless steel P-polyurethane AL aluminum);

7. Depth of QJB low-speed thruster installation system (m);

8. Does the QJB low-speed thruster require a diffuser cover;

9. Is the QJB low-speed thruster equipped with a control cabinet;

10. Does the QJB low-speed thruster come with other accessories so that we can select the right one for you.

Jiangsu Du'an Environmental Protection QJB Submersible Thruster provides the following documents (but not limited to these) for factory delivery:

A. Detailed equipment installation, use, and maintenance manual

B. Detailed equipment manual, including:

1. Standards for production and manufacturing.

2. Detailed structural description, component structure diagram, and assembly diagram.

3. Detailed external dimensions (installation dimensions) diagram.

4. List of all component materials.

5. Detailed instructions or manuals on electrical control and design.

6. Equipment production and factory inspection certificates, inspection records, and equipment appraisal certificates issued by the manufacturer.

C. General layout plan

A general plan showing the plan, elevation, and cross-section of the thruster and motor, and indicating all control dimensions and the required spacing for installation, use, and maintenance.

D. Detailed drawing

1. Provide a detailed installation diagram of all assembly accessories for the thruster and its operating parts.

2. Detailed installation diagram indicating the connection or welding between the thruster and the foundation and anchor bolts.

E. Detailed instructions on on-site installation methods.

F. On site inspection, testing, and trial operation procedures and records.

G. Supply packing list