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WRY Type High Temperature Resistance Thermal Oil Pump

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The WRY series heat transfer oil pump is a type of pump used for transporting high-temperature hot oil, which can transport weakly corrosive high-temperature liquids without solid particles, with an operating temperature of ≤ 350 ℃. Widely used in various industrial fields such as petroleum, chemical, rubber, plastics, pharmaceuticals, textiles, printing and dyeing, road construction, food, etc. It has the characteristics of high temperature resistance, high efficiency and energy saving, reasonable structure, and superior sealing performance.
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Performance Feature



The WRY Series Hot Oil Pump is a commonly used pump for transporting high-temperature hot oil, and itsperformance characteristics are as follows:

  • High temperature resistance: The WRY series hot oil pump can withstand high temperatures and can usually transport hot oil with temperatures below 300 ℃. Special models can reach up to 350 ℃ and are suitable for various high-temperature conditions.

  • Efficient and energy-saving: This series of hot oil pumps has a highly efficient hydraulic design, which can effectively reduce energy consumption and have low operating costs.

  • Reasonable structure: adopting a horizontal single-stage single suction cantilever structure, easy to disassemble and maintain; The impeller adopts a closed structure, which improves the efficiency and stability of the pump.

  • Good sealing performance: High performance mechanical seals or packing seals are used to ensure the sealing of the pump at high temperatures and prevent leakage.

  • Low vibration and noise: The design structure of the pump ensures low vibration and noise during operation, providing a relatively quiet working environment.

  • Excellent material selection: Key components such as pump body, pump cover, impeller, etc. are made of high-temperature resistant alloy materials, which extends the service life of the pump.

  • Widely applicable: It is widely used in hot oil transportation systems in industrial fields such as petroleum, chemical, rubber, plastics, pharmaceuticals, textiles, printing and dyeing, food, and building materials.

Easy maintenance: The structural design is reasonable, easy to disassemble and replace parts, and the daily maintenance is simple.


Structural Features


The WRY Series hot oil pump has its unique characteristics in structural design, ensuring its reliability and efficiency under high temperature conditions. The following are its main structural characteristics:

  1. Horizontal single-stage single suction cantilever structure:

    This structure makes the installation and maintenance of the pump more convenient.

    Has good stability and reliability.

  2. Closed impeller:

    The impeller adopts a closed design, effectively improving the efficiency of the pump.

    The impeller has undergone dynamic balance correction, running smoothly with minimal vibration.

  3. High performance mechanical seal:

    Adopting advanced mechanical seal design to ensure sealing and durability under high temperature conditions.

    The sealing materials are mostly high-temperature resistant graphite, silicon carbide, etc., which are suitable for the needs of high-temperature hot oil transportation.

  4. Pump body material:

    The pump body, pump cover, and main overcurrent components are made of high-strength, high-temperature resistant cast steel or stainless steel materials to ensure long-term stable operation at high temperatures.

    Some models use ductile iron, which balances strength and temperature resistance.

  5. Heat dissipation design:

    The bearing seat is designed with a heat dissipation structure, coupled with a cooling system, so that the bearing can work normally even in high temperature environments.

    Some pump models are equipped with external cooling devices to improve the overall heat dissipation effect of the pump.

  6. Bearings and lubrication system:

    Adopting high-temperature bearings to ensure stable operation under high temperature conditions.

    The lubrication system is designed reasonably to ensure that bearings and other moving parts are fully lubricated.

  7. Easy maintenance:

    The structural design is simple, easy to disassemble, and convenient for daily maintenance and repair.

    The replaceable vulnerable parts design reduces maintenance costs and time.

  8. Flange connection:

    Design standards for import and export flanges to facilitate connection with pipeline systems.

    High temperature resistant sealing materials are used at the flange interface to ensure the sealing performance of the connection.

These structural features enable the WRY series hot oil pump to exhibit excellent performance and reliability in high-temperature hot oil transportation, and are widely used in various industrial fields.

Structural characteristics of WRY thermal oil pump


Application Areas:



Application industry

Purpose

chemical industry

In the chemical industry, it can be applied to the operation of chemical units, such as polymerization, condensation, distillation, rectification, concentration, evaporation and other processes, to provide heat for their corresponding transposition.

Petrochemical industries

In the petrochemical industry, it can be applied to processes such as synthesis, reaction, distillation, and refining; It can also be used for insulation devices such as asphalt and heavy oil; It can also be used for tank heating, fuel oil heating, etc.

Mechanical industry

In the mechanical industry, it can be applied to electroplating treatment devices, heat treatment devices, spray drying, rolling machines, baking processes, melt casting, etc. It also involves heat transfer oil heating.

Pharmaceutical industry

The biggest advantage of thermal oil as an indirect heat transfer medium is its precise temperature control of the heated process during heat exchange, which can facilitate effective control of the process and refinement of products and quality.

Grease chemical industry

In the oil industry, it can be applied in fatty acid distillation equipment, oil decomposition equipment, vacuum deodorization equipment, lipidation equipment, distillation, distillation and concentration equipment.

Timber industry

In the wood industry, it can be used for heating artificial fiberboard and flower board forming machines, as well as for heating wood dryers.

Painting industry

In the painting industry, it is applied in equipment such as paint baking and oil bath, thereby improving the surface quality of painting.

Food industry

Thermal oil is widely used in various processes of food processing, such as baking of pastries, biscuits and other foods, steaming and frying of meat products, as well as refining and purifying edible oils and partial packaging processes of food, all of which use thermal heating.

Paper making and printing industry

Used for heating equipment such as corrugated paper processing machines, hot melt machines, paper processing devices, dryers, etc. in the papermaking and printing industries.

Paper making, printing and dyeing industry

In the textile and printing and dyeing industries, the application of heat setting machines, drying and baking machines has gained very mature experience.

Plastic and rubber industry

In the plastic and rubber industries, it can be used as a heating energy source for equipment such as hot presses, calenders, extruders, vulcanization molding machines, resin hardening devices, laminating machines, and artificial leather processing devices.


Performance Parameter Table



Model

Flow

(m³/h)

Head

(m)

Speed

r/min

Power(KW)

Efficiency

n%

NPSH 

m

shaft power

Equipped with power

26-20-100

4.5

15

2825

0.45

0.75

40

0.8

50-32-150

8

22

2840

1

1.5

42

1.1

50-32-160

10

25

2840

1.5

2.2

42

1.2

65-40-160

12.5

25

2880

2.5

3

45

1.2

50-50-170

12.5

32

2890

3.2

4

45

1.2

50-50-150

24

18

2890

3.2

4

46

1.2

65-40-190

18

40

2900

4.5

5.5

52

1.4

65-50-180

32

32

2900

4.5

5.5

52

1.7

65-50-170

40

25

2900

4.5

5.5

52

1.8

65-40-200

25

50

2900

6.7

7.5

53

1.6

80-50-180

40

40

2900

6.7

7.5

63

1.8

80-50-170

60

20

2900

6.7

7.5

63

2.8

 100-65-190

60

38

2930

9.2

11

68

2.6

 100-65-200

80

40

2930

12.5

15

70

3.1




Pump usage and maintenance


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. Power on preparation

(1) Clean up the site, unscrew the bearing seat screws, and add clean thermal oil as lubricating oil. When adding lubricating oil to a 110KW or higher oil pump, it should be injected from one hole until oil overflows from the other hole. During the injection process, touch the coupling with your hand until there is no more gas coming out of the hole, and then tighten the screw hole bolt.

(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 expel air from the pump. At this time, the gate valve of R on the discharge pipe should be closed.

(5) The conveyed heat transfer oil should be uniformly heated before driving. Preheating is carried out by continuously passing the conveyed heat transfer oil through the pump body, avoiding severe temperature fluctuations. If there are any abnormal situations, the machine should be stopped immediately for inspection.

Preheating standard: The temperature of the pump casing shall not be lower than the inlet oil temperature by 40 ℃, and the preheating speed shall be 50 ℃/hour. When preheating during start-up, the side screws on the pump bracket should be loosened by 0.3-0.5 mm, and the screws should be tightened after preheating.

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


2. Power on

(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 pump, slowly heat the equipment in the production process to 100-130 ℃ and maintain it at that temperature to continue running. Dehydrate and degas until the moisture in the heat transfer oil is completely evaporated before heating the equipment to operating temperature.

(5) After the unit is first put into use and operated in working condition (or actual trial operation for 3-4 hours), it should be stopped again to check whether the coaxiality of the two couplings has changed. If there is a change, the coaxiality of the couplings can still be adjusted according to the installation and inspection regulations of the unit until it meets the requirements and the pump shaft can be easily rotated by hand.

(6) During the startup process, pay attention to the power reading and vibration of the motor at all times. The vibration value should not exceed 0.6 millimeters. If there are any abnormalities, stop and check.


3. Maintenance

(1) The pump shaft is equipped with a packing box at the front end, which has reliable sealing performance. At the same time, mechanical seals and oil seals are 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 sealing surface wear in, the leakage will decrease or stop.

(2) The heat transferred from the conveying medium to the pump cover and bearing is dissipated by the surface of the pump cover and bearing 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 impeller side of the pump 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 diesel, and the contact surface must be checked for damage. If there is any damage, a new bearing must be replaced.

When installing the ball bearing on the impeller side, the side with a dust cover should be lubricated with thermal oil towards the front of the impeller machine.

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 a 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) It is not allowed to adjust the flow rate with gate valves on the input pipe to avoid cavitation.

(5) The pump should not operate continuously at a flow rate lower than 30% of the design flow rate. If it must operate under this condition, a bypass pipe should be installed at the outlet and the flow rate should be above 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

(1) Cut off the power supply.

(2) 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.


Disassembly and assembly of pumps


1. Disassembly sequence of pump

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

(2) Unscrew 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 retaining ring.

(8) Press the pump shaft out of the bearing seat.

(9) Press out the pump shaft bearing and remove the mechanical seal moving ring and "O" ring spring (without damage, no need to remove).

(10) Press out the static O-ring inside the bearing seat.


2. Pump assembly

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 the parts with new ones. During installation, be careful not to knock or damage the parts.


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 the parts with new ones. During installation, be careful not to knock or damage the parts.

 

Installation and inspection of the unit

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

2. The installation height, length, and diameter of the pump suction pipe should meet the calculated values and strive for simplicity. The distance from the center of the pipe elbow to the head of the pump base should generally be less than 1 meter and have welded iron plates and supports.

3. The suction and discharge pipelines should also have pipe racks or supports, and the pump is not allowed to bear the load of the pipelines.

Warning: The stress generated by thermal expansion on the pipeline, if transmitted to the pump, can cause deformation, damage to the coupling, bearings, and pump shaft. Therefore, support must be provided when approaching the pump body.

4. The installation location should be spacious enough to facilitate maintenance work and ensure 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, and 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 whether there are any defects or looseness in the base and anchor bolts. After passing the inspection, tighten the anchor bolts and recheck the levelness of the pump.

(5) Calibrate the coaxiality of the pump shaft and motor shaft. When using a leveling ruler to check, the circular runout on the outer circle of the coupling should not exceed 0.1 millimeters, and the gap between the two coupling planes should be ensured to be between 2-3 millimeters. When calibrating the coupling by using a leveling ruler with a difference of 90 degrees, the circular runout in the other direction should also not exceed 0.1 millimeters. When adjusting, the motor is generally adjusted relative to the pump, and the coaxiality of the coupling can be adjusted by inserting a flat pad.

(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 outer circle of the coupling.

Attention: When the coupling is not concentric, it can cause excessive wear on the coupling and elastic block, as well as damage to the bearings and shaft seals, and pump shaft breakage. If the coaxiality does not meet the installation requirements, driving is strictly prohibited.

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

(8) Before starting the pump, the inlet and outlet pipelines should be cleaned, especially for welded pipelines, attention should be paid to handling burrs, welding slag, and oxide skin. A filter should be added to the inlet section of the pump to prevent debris from entering the pump.

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