LQRY Hot Oil Pump (Thermal Oil Pump) | Overview of High Temperature Oil Pump Products

The LQRY series oil pump has been widely used in China's heat transfer heating system and has entered various industrial fields such as petroleum, chemical, rubber, plastic, pharmaceutical, textile, printing and dyeing, road construction, food, etc. It is mainly used to transport weakly corrosive high-temperature liquids without solid particles, with a temperature of ≤ 370 ℃, making it an ideal hot oil circulation pump.

LQRY Hot Oil Pump (Thermal Oil Pump) | Significance of High Temperature Oil Pump Model

LQRY Hot Oil Pump (Thermal Oil Pump) | Structural Features of High Temperature Oil Pump

LQRY oil pump is the second generation product developed by our unit based on the digestion and absorption of foreign oil pumps. The basic structural form is a single-stage single suction cantilever foot support structure. The inlet of the pump is axial suction, and the outlet is vertically upward from the center. It is installed on the base together with the motor.

The support of the heat transfer oil pump adopts a double end ball bearing structure, with lubricating oil lubrication at the front end and grease lubrication at the rear end. There is a heat transfer oil pipe in the middle to observe the sealing condition and recover the heat transfer oil at any time.

Adopting a self heating heat dissipation structure, it changes the traditional water cooling structure, making the structure simple, small in size, saving operating costs, good in performance, and reliable in use.

The LQRY series oil pump (1) adopts a combination of packing seal and mechanical seal. The packing seal uses high-temperature resistant packing, which has good thermal stress recovery. The mechanical seal uses hard alloy material with high mechanical strength and good wear resistance to ensure sealing performance under high temperature conditions.

(2) The use of third-generation polytetrafluoroethylene (PTFE) for lip seals has led to a significant improvement in sealing performance, with 25 times higher reliability than rubber seals and extremely strong corrosion resistance.

LQRY Hot Oil Pump (Thermal Oil Pump) | Safety of High Temperature Oil Pump Unit

The installation of the heat transfer oil pump has a significant impact on the smooth operation and service life of the pump, so the installation work must be carried out carefully and not hastily.

The installation height, length, and diameter of the suction pipe of the heat transfer oil pump should meet the calculated values, striving for simplicity and reducing unnecessary losses (such as bends)

3. The suction and discharge pipelines of the heat transfer oil pump should have pipe racks, and the pump is not allowed to bear the load of the pipeline.

4. The installation location of the heat transfer oil pump should be wide enough to facilitate maintenance work and good heat dissipation.

5. Installation sequence:

1) Place the unit on a foundation with embedded anchor bolts, and place a pair of pads between the base and the foundation for reference.

2) Loosen the coupling and place a spirit level on the pump shaft and base respectively. Adjust the wedge pad to make the unit level. After aligning, tighten the anchor bolts appropriately to prevent movement.

3) Pour concrete into the base and anchor bolt holes.

4) After the concrete has dried and solidified, check the base and anchor bolts for any defects or looseness. After passing the inspection, tighten the anchor bolts and recheck the levelness of the pump.

5) Correct the coaxiality of the pump shaft and motor shaft. The deviation on the outer circle of the coupling is allowed to be 0.1 millimeters, and the gap between the two coupling planes should be ensured to be 2-3 millimeters. The maximum and minimum gap difference around the end faces of the two couplings should not exceed 0.3 millimeters.

6) After connecting the pipeline and determining the direction of rotation of the prime mover, connect the coupling again and verify the coaxiality of the coupling.

7) After 3-4 hours of actual trial operation of the unit, a final inspection should be conducted. If there are no adverse phenomena, the installation is considered qualified.

8) To prevent debris from falling into the machine during installation, all holes in the unit should be covered.

When cleaning the inlet and outlet pipelines before starting the pump, a filter should be added to the inlet section of the pump to prevent debris from entering the pump.

LQRY Hot Oil Pump (Thermal Oil Pump) | Disassembly and Assembly of High Temperature Oil Pump

1. Disassembly sequence of heat transfer oil pump

1) Drain the liquid from the pump and the lubricating oil from the bearing bracket.

2) Tighten the fixing bolts of the motor, move the motor away from the base, and remove the two halves of the coupling.

3) Remove the pump cover connection, loosen the bearing seat bracket bolts, and extract the pump cover along with the bearing bracket and rotor part from the pump body.

4) Unscrew the impeller nut and remove the impeller.

5) Unscrew the pump cover and bearing seat bolts, and remove the pump cover.

6) Unscrew the bolt on the right end bearing cover and remove the bearing cover.

7) Remove the bearing gear diagram.

8) Press the pump shaft from the bearing seat.

9) Press out the bearing on the pump shaft and remove the mechanical seal moving ring and '0' - shaped trapped spring (not damaged, no need to remove)

10) Press out the static 'force' ring inside the bearing seat.

2. Assembly of heat transfer oil pump

The assembly sequence of the pump can be carried out in the reverse order of disassembly. When disassembling and reassembling, it is necessary to check whether the mechanical seals and various parts have failed. If there is any failure or damage, it is necessary to replace them with new spare parts. During installation, be careful not to knock on them to avoid damaging the parts

LQRY Hot Oil Pump (Thermal Oil Pump) | Use and Maintenance of High Temperature Oil Pump

Firstly, after the installation of the pump and pipeline, whether using water pressure or air pressure, the inlet and outlet valves of the pump must be closed before conducting pressure testing to prevent damage to the seals and oil leakage. 1. Preparation for starting the thermal oil pump

1) Clean up the site, unscrew the bearing seat screws, and add thermal oil as lubricating oil

2) Check if the motor rotation direction is consistent with the pump rotation direction.

3) The coupling pump should rotate flexibly when moved by hand.

4) Before driving, the pump should be filled with the transferred heat transfer oil to drive it out At this time, the gate valve on the pipeline for air discharge should be closed.

5) The conveyed heat transfer oil should be uniformly heated before driving, and preheating is carried out by continuously passing the conveyed heat transfer oil through the pump body.

Preheating standard: The temperature of the pump casing shall not be lower than 40 'of the inlet oil temperature. When preheating at a speed of 50X7, the side nut on the pump support foot should be loosened by 0.3-0.5mm during preheating, and tightened after preheating.

6) Before driving, check whether the foundation and screws are loose, and whether the seal is normal.

2. Turn on the heat transfer oil pump

(1) Thoroughly inspect whether all preparatory work has been completed.

(2) Turn on the switches of various instruments.

(3) Connect the power supply, when the pump reaches normal speed and the instrument displays a considerable pressure, gradually open the gate valve on the output pipeline and adjust it to the required working condition. When the gate valve on the output pipeline is closed The pump should not work continuously for more than 3 minutes.

(4) During the initial operation of the heat transfer oil pump, slowly heat the equipment in the production process to 100-1300 and maintain it at that temperature to continue running. Dehydrate and degas until the water in the heat transfer oil is completely evaporated before adding the equipment Hot To the operating temperature.

(5) After the first 3-4 hours of operation, heat the equipment to operating temperature and turn off the oil pump. Check the coaxiality of the pump shaft and motor shaft coupling. The deviation between the pump shaft and motor shaft should be controlled within the allowable range. The pump shaft should rotate lightly, flexibly, and without vibration by hand. If the above requirements cannot be met, the rotation should be smooth Adjustments should be made again.

(6) During the start-up process of the thermal oil pump Always pay attention to the reading and vibration of the motor, with a vibration value not exceeding 0.6 millimeters If there are any abnormalities, the vehicle should be stopped for inspection

3. Maintenance of thermal oil pump

1) The pump shaft is equipped with a packing box at the front end, which has reliable sealing performance. At the same time, a mechanical seal device is installed in the bearing seat, so a large amount of leakage is impossible to occur, and a small amount of leakage can be discharged and received through the leakage pipe mouth. It is normal to have a small amount of leakage at the beginning of operation, but after a certain period of time, the leakage will decrease or stop after the sealing surface is closed.

2) The heat transferred from the conveying medium to the pump cover and bearings is dissipated by the surface of the pump cover and shaft seat, making the temperature of the bearing seat adapt to the temperature of the shaft sealing performance. Therefore, when selecting the installation position of the pump, it is necessary to facilitate the diffusion of heat from the pump cover and bearing seat, without any heat accumulation phenomenon.

3) There are two ball bearings installed in the bearing seat. One ball bearing on the pump impeller side is lubricated with the conveyed heat transfer oil, while the other ball bearing on the coupling side is lubricated with high-temperature grease

After running for 3000 hours, each ball bearing must be removed and cleaned with oil before checking for any damage to the contact surface If any; Damaged, new bearings must be replaced.

When installing the ball bearing on the impeller side, the side with a dust cover should be installed facing the impeller, and thermal oil should be injected for lubrication before starting up.

The ball bearing on the coupling side is lubricated with composite calcium based high-temperature grease (ZFG-4). When reinstalling the bearing, the side with the dust cover should also be installed facing the impeller side, and filled with grease (about 1/2 of the space between the ball bearing and the housing) during installation. After the bearing has been running for 48 hours, use a grease gun to inject supplementary grease into the pressure oil cup on the bearing cover.

4) Do not use the gate valve on the input pipe to adjust the flow rate to avoid cavitation.

5) The pump should not be lower than 3051; If continuous operation is required under the designed flow rate, a bypass pipe should be installed at the outlet to ensure that the flow rate reaches the minimum value mentioned above.

6) Regularly check the looseness of the anchor bolts, whether the pump casing temperature is consistent with the inlet temperature, the fluctuation of the outlet pressure gauge, and the vibration of the pump.

7) Pay attention to whether there is any noise during the operation of the pump. If any abnormal state is found, it should be dealt with in a timely manner.

4. Shutdown of thermal oil pump:

1) Cut off the power supply.

Empty the liquid inside the pump, clean it, and regularly rotate the impeller 180 ° to prevent shaft deformation until the pump body is completely cooled.

LQRY hot oil pump (thermal oil pump) | Maintenance cycle and content of high-temperature oil pump

1. The repair cycle for bolts should be determined based on the equipment usage and maintenance capabilities. The following table is provided for users' reference: