First, the type of hot water circulating pump brush DC hot water circulating pump brushless DC hot water circulating pump (motor type)
Brushless DC Hot Water Circulating Pump (Magnetic Drive Isolated) (Shenzhen - Zhongke Century - Science and Technology)
Second, three kinds of DC hot water circulation pump features:
1. Brushed DC water pump: When the water pump works, the coil and commutator rotate, and the magnet and carbon brush do not turn. The alternating change of coil current direction is accomplished by the commutator and brush that the motor rotates, as long as the motor rotates. Carbon brushes will wear out. When the computer's water pump runs to a certain level, the carbon brush wear gap will increase, and the sound will increase. After a few hundred hours of continuous operation, the carbon brushes will not be able to change direction.
Advantages: low prices.
2. Brushless motor type DC water pump: The motor type brushless DC water pump is composed of a brushless DC motor plus an impeller. The shaft of the motor is connected with the impeller, and there is a gap between the stator and the rotor of the water pump. If the water is used for a long time, the water will infiltrate into the motor and increase the possibility of the motor being burned out.
Advantages: Brushless DC motor has been standardized, there are a large number of specialized manufacturers to produce, the cost is relatively low, high efficiency.
3, brushless DC magnetic drive water pump: brushless DC water pump uses electronic components to change direction, without the use of carbon brushes for the use of high-performance wear-resistant ceramic shafts and ceramic sleeves, sleeves and magnets through the injection into a whole also Wear is avoided, so the life of brushless DC magnetic pumps is greatly enhanced. The stator part and the rotor part of the magnetic isolation pump are completely isolated. The stator and the circuit board part are encapsulated with epoxy resin, 100% waterproof. The rotor part uses permanent magnets. The pump body is made of environmentally friendly materials, low noise, small size, and performance. stable. The stator windings can be used to adjust various desired parameters, allowing wide voltage operation.
Advantages: Long life, low noise up to 35dB, can be used for hot water circulation. The stator and circuit board part of the motor are encapsulated with epoxy resin and completely isolated from the rotor. It can be installed underwater and completely waterproof. The axis of the pump adopts high-performance ceramic shaft, which has high precision and good shock resistance.
Third, the pump parameter performance:
--(DC30 series size 34mmx36mmx39mm) Voltage: DC4.5-24v; Head: 40cm-230cm; Flow rate: 100-300L/H--(DC40 series size 86mmx63mmx48mm) Voltage: DC6-24v; Head: 150cm-700cm; :246-700L/H--(DC50 series size 100mmx84mmx64mm) Voltage: DC12-24v; Head: 155cm-1400cm; Flow rate: 1030-3000L/H
Features:
1. Longevity up to 10 years 2. No maintenance required 3. The stator and circuit board part of the motor are encapsulated with epoxy resin and completely isolated from the rotor, which solves the water leakage problem caused by the long-term dive of the motor type DC water pump and can be installed underwater. Completely waterproof 4. The axis of the pump adopts high-performance ceramic shaft, high precision, good shock resistance 5. Small size and high efficiency 6. Low noise <35db Low power consumption 7. Multifunctional design, a multi-purpose machine - fountain, pumping, Filter, four-in-one cycle;
8. Can be customized according to user requirements Note:
Maximum liquid temperature 60 to 100 degrees (according to user requirements)
Power cord length: According to user requirements Application range: Can be used in computer cooling system, solar fountain, desktop fountain, crafts, coffee machine, drinking fountains, tea maker, pourer, soilless cultivation, shower, bidet, wash Teeth, water heater pressurization, plumbing mattress, hot water circulation, swimming pool water circulation filter, foot surf massage basin, surf massage bathtub, car cooling circulation system, oiler, humidifier, air conditioner, washing machine, medical equipment, cooling system ,Bathroom products.
Fourth, the principle of brushless DC pump (magnetic isolation pump) Brushless DC magnetic drive pump magnet and impeller injection molding to form the rotor of the motor, the rotor has a direct injection molding sleeve, through a high-performance ceramic shaft fixed in the shell In the body, the stator and the circuit board part of the motor are potted with epoxy resin in the pump body. There is a thin wall isolation between the stator and the rotor. It does not need to be equipped with the traditional mechanical shaft seal, and therefore it is completely sealed. The torque of the motor is generated by energizing the coil on the stator plate (stator) to generate a magnetic field to drive the permanent magnet (rotor) to operate. The magnets are magnetized with n (n even) stages so that the magnet parts form a complete magnetic system with each other. When the magnetic pole generated by the stator coil is opposite to the magnetic pole of the magnet, that is, the displacement angle Φ=0 between the two magnetic poles, the magnetic energy of the magnetic system is the lowest; when the magnetic pole is rotated to the same pole, ie, the displacement between the two magnetic poles The angle Φ=2π/n, the magnetic energy of the magnetic system is maximum at this time. After removing the external force, because the magnetic poles of the magnetic system repel each other, the magnetic force will restore the magnet to the state with the lowest magnetic energy. The magnet then moves to drive the magnetic rotor to rotate. The brushless DC water pump uses electronic commutation without the use of carbon brushes. Magnet rotors and stator blades have multi-stage magnetic fields. When the magnet rotor rotates at an angle with respect to the stator, it automatically changes the direction of the magnetic pole so that the rotor always retains the same level of repulsion. So that the brushless DC magnetic isolation pump has a higher speed and efficiency.
The stator and rotor of the magnetic isolation pump are completely isolated, completely avoiding the liquid leakage problem of the conventional motor type brushless DC water pump. And it can be completely submerged and completely waterproof, which effectively improves the service life and performance of the pump.
V. Structure composition and characteristics Brushless DC water pump (magnetic isolation pump) consists of pump body (separator), motor stator, shaft, bearing and rotor water (magnet and impeller) parts:
Magnet (NdFeB Magnet)
The permanent magnets made of rare earth permanent magnets have a wide operating temperature range (-45-400°C), high coercive force, good anisotropy in the magnetic field direction, and no demagnetization when they are close to the same pole. It is a good source of magnetic field.
When a spacer is used for the spacer, the spacer is in a sinusoidal alternating magnetic field, and an eddy current is induced in the section perpendicular to the direction of the magnetic flux and converted into heat. The vortex expression is: where Pe-vortex; K-constant; n—the rated speed of the pump; the T-magnet drive torque; the pressure in the F-spacer; the inner diameter of the D-spooler; the resistivity of a material; The tensile strength. When the pump is well designed, n and T are given by working conditions. To reduce eddy currents, only F, D, etc. can be considered. The use of high-resistivity, high-strength non-metallic materials to make isolation sleeves is very effective in reducing eddy currents.
Because the brushless DC magnetic isolation pump works by rotating the rotor with an energized coil, the rotation uses a high-performance ceramic shaft to fit the sleeve to maintain the smooth rotation and noise of the rotor, which can achieve high accuracy and effectively reduce the Rotary resistance and noise.
Sliding bearing magnetic pump sliding bearing materials are engineering plastic steel (POM) or ceramic. As the plastic (POM) and ceramics have good heat resistance, corrosion resistance, and friction resistance, so the magnetic pump sliding bearings are mostly made of engineering ceramics. Because the engineering ceramics are brittle and the expansion coefficient is small, the bearing clearance must not be too small to avoid shaft accidents.
Since the magnetic pump's sliding bearings are lubricated with the medium being conveyed, bearings should be made of different materials according to different media and operating conditions.
Protective measures 1. When the driven part of the magnetic drive is operated under overload conditions, the driven part of the magnetic drive will slip on the shaft, effectively protecting the motor.
2. When the pump is running, a small amount of liquid must be used to flush and cool the annulus region between the inner magnetic rotor and the isolation sleeve and the friction pair of the sliding bearing. The coolant flow rate is typically 2%-3% of the pump design flow rate, and the annulus area between the inner magnetic rotor and the isolation sleeve generates high heat due to eddy currents. When the cooling lubricating fluid is not enough or the flushing hole is not smooth and blocked, the medium temperature will be higher than the working temperature of the permanent magnet, so that the magnetic rotor will gradually lose its magnetism and the magnetic actuator will fail. When the medium is water or a water-based liquid, the temperature rise in the annular region can be maintained at 3-5°C. When the medium is a hydrocarbon or oil, the temperature rise in the annular region can be maintained at 5-8°C.
Brushless DC Hot Water Circulating Pump (Magnetic Drive Isolated) (Shenzhen - Zhongke Century - Science and Technology)
Second, three kinds of DC hot water circulation pump features:
1. Brushed DC water pump: When the water pump works, the coil and commutator rotate, and the magnet and carbon brush do not turn. The alternating change of coil current direction is accomplished by the commutator and brush that the motor rotates, as long as the motor rotates. Carbon brushes will wear out. When the computer's water pump runs to a certain level, the carbon brush wear gap will increase, and the sound will increase. After a few hundred hours of continuous operation, the carbon brushes will not be able to change direction.
Advantages: low prices.
2. Brushless motor type DC water pump: The motor type brushless DC water pump is composed of a brushless DC motor plus an impeller. The shaft of the motor is connected with the impeller, and there is a gap between the stator and the rotor of the water pump. If the water is used for a long time, the water will infiltrate into the motor and increase the possibility of the motor being burned out.
Advantages: Brushless DC motor has been standardized, there are a large number of specialized manufacturers to produce, the cost is relatively low, high efficiency.
3, brushless DC magnetic drive water pump: brushless DC water pump uses electronic components to change direction, without the use of carbon brushes for the use of high-performance wear-resistant ceramic shafts and ceramic sleeves, sleeves and magnets through the injection into a whole also Wear is avoided, so the life of brushless DC magnetic pumps is greatly enhanced. The stator part and the rotor part of the magnetic isolation pump are completely isolated. The stator and the circuit board part are encapsulated with epoxy resin, 100% waterproof. The rotor part uses permanent magnets. The pump body is made of environmentally friendly materials, low noise, small size, and performance. stable. The stator windings can be used to adjust various desired parameters, allowing wide voltage operation.
Advantages: Long life, low noise up to 35dB, can be used for hot water circulation. The stator and circuit board part of the motor are encapsulated with epoxy resin and completely isolated from the rotor. It can be installed underwater and completely waterproof. The axis of the pump adopts high-performance ceramic shaft, which has high precision and good shock resistance.
Third, the pump parameter performance:
--(DC30 series size 34mmx36mmx39mm) Voltage: DC4.5-24v; Head: 40cm-230cm; Flow rate: 100-300L/H--(DC40 series size 86mmx63mmx48mm) Voltage: DC6-24v; Head: 150cm-700cm; :246-700L/H--(DC50 series size 100mmx84mmx64mm) Voltage: DC12-24v; Head: 155cm-1400cm; Flow rate: 1030-3000L/H
Features:
1. Longevity up to 10 years 2. No maintenance required 3. The stator and circuit board part of the motor are encapsulated with epoxy resin and completely isolated from the rotor, which solves the water leakage problem caused by the long-term dive of the motor type DC water pump and can be installed underwater. Completely waterproof 4. The axis of the pump adopts high-performance ceramic shaft, high precision, good shock resistance 5. Small size and high efficiency 6. Low noise <35db Low power consumption 7. Multifunctional design, a multi-purpose machine - fountain, pumping, Filter, four-in-one cycle;
8. Can be customized according to user requirements Note:
Maximum liquid temperature 60 to 100 degrees (according to user requirements)
Power cord length: According to user requirements Application range: Can be used in computer cooling system, solar fountain, desktop fountain, crafts, coffee machine, drinking fountains, tea maker, pourer, soilless cultivation, shower, bidet, wash Teeth, water heater pressurization, plumbing mattress, hot water circulation, swimming pool water circulation filter, foot surf massage basin, surf massage bathtub, car cooling circulation system, oiler, humidifier, air conditioner, washing machine, medical equipment, cooling system ,Bathroom products.
Fourth, the principle of brushless DC pump (magnetic isolation pump) Brushless DC magnetic drive pump magnet and impeller injection molding to form the rotor of the motor, the rotor has a direct injection molding sleeve, through a high-performance ceramic shaft fixed in the shell In the body, the stator and the circuit board part of the motor are potted with epoxy resin in the pump body. There is a thin wall isolation between the stator and the rotor. It does not need to be equipped with the traditional mechanical shaft seal, and therefore it is completely sealed. The torque of the motor is generated by energizing the coil on the stator plate (stator) to generate a magnetic field to drive the permanent magnet (rotor) to operate. The magnets are magnetized with n (n even) stages so that the magnet parts form a complete magnetic system with each other. When the magnetic pole generated by the stator coil is opposite to the magnetic pole of the magnet, that is, the displacement angle Φ=0 between the two magnetic poles, the magnetic energy of the magnetic system is the lowest; when the magnetic pole is rotated to the same pole, ie, the displacement between the two magnetic poles The angle Φ=2π/n, the magnetic energy of the magnetic system is maximum at this time. After removing the external force, because the magnetic poles of the magnetic system repel each other, the magnetic force will restore the magnet to the state with the lowest magnetic energy. The magnet then moves to drive the magnetic rotor to rotate. The brushless DC water pump uses electronic commutation without the use of carbon brushes. Magnet rotors and stator blades have multi-stage magnetic fields. When the magnet rotor rotates at an angle with respect to the stator, it automatically changes the direction of the magnetic pole so that the rotor always retains the same level of repulsion. So that the brushless DC magnetic isolation pump has a higher speed and efficiency.
The stator and rotor of the magnetic isolation pump are completely isolated, completely avoiding the liquid leakage problem of the conventional motor type brushless DC water pump. And it can be completely submerged and completely waterproof, which effectively improves the service life and performance of the pump.
V. Structure composition and characteristics Brushless DC water pump (magnetic isolation pump) consists of pump body (separator), motor stator, shaft, bearing and rotor water (magnet and impeller) parts:
Magnet (NdFeB Magnet)
The permanent magnets made of rare earth permanent magnets have a wide operating temperature range (-45-400°C), high coercive force, good anisotropy in the magnetic field direction, and no demagnetization when they are close to the same pole. It is a good source of magnetic field.
When a spacer is used for the spacer, the spacer is in a sinusoidal alternating magnetic field, and an eddy current is induced in the section perpendicular to the direction of the magnetic flux and converted into heat. The vortex expression is: where Pe-vortex; K-constant; n—the rated speed of the pump; the T-magnet drive torque; the pressure in the F-spacer; the inner diameter of the D-spooler; the resistivity of a material; The tensile strength. When the pump is well designed, n and T are given by working conditions. To reduce eddy currents, only F, D, etc. can be considered. The use of high-resistivity, high-strength non-metallic materials to make isolation sleeves is very effective in reducing eddy currents.
Because the brushless DC magnetic isolation pump works by rotating the rotor with an energized coil, the rotation uses a high-performance ceramic shaft to fit the sleeve to maintain the smooth rotation and noise of the rotor, which can achieve high accuracy and effectively reduce the Rotary resistance and noise.
Sliding bearing magnetic pump sliding bearing materials are engineering plastic steel (POM) or ceramic. As the plastic (POM) and ceramics have good heat resistance, corrosion resistance, and friction resistance, so the magnetic pump sliding bearings are mostly made of engineering ceramics. Because the engineering ceramics are brittle and the expansion coefficient is small, the bearing clearance must not be too small to avoid shaft accidents.
Since the magnetic pump's sliding bearings are lubricated with the medium being conveyed, bearings should be made of different materials according to different media and operating conditions.
Protective measures 1. When the driven part of the magnetic drive is operated under overload conditions, the driven part of the magnetic drive will slip on the shaft, effectively protecting the motor.
2. When the pump is running, a small amount of liquid must be used to flush and cool the annulus region between the inner magnetic rotor and the isolation sleeve and the friction pair of the sliding bearing. The coolant flow rate is typically 2%-3% of the pump design flow rate, and the annulus area between the inner magnetic rotor and the isolation sleeve generates high heat due to eddy currents. When the cooling lubricating fluid is not enough or the flushing hole is not smooth and blocked, the medium temperature will be higher than the working temperature of the permanent magnet, so that the magnetic rotor will gradually lose its magnetism and the magnetic actuator will fail. When the medium is water or a water-based liquid, the temperature rise in the annular region can be maintained at 3-5°C. When the medium is a hydrocarbon or oil, the temperature rise in the annular region can be maintained at 5-8°C.
Spherical Roller Bearings have two rows of rollers, a common sphered outer ring raceway and two inner ring raceways inclined at an angle to the bearing axis . The centre point of the sphere in the outer ring raceway is at the bearing axis. Therefore, these bearings are self-aligning and insensitive to misalignment of the shaft relative to the housing, which can be caused, for example, by shaft deflection. Spherical Roller Bearings are designed to accommodate heavy radial loads, as well as heavy axial loads in both directions.
Bearing performance is not only determined by load or speed ratings. There are a number of other factors that contribute to bearing performance. To a large extent, performance is influenced by the geometry of the rollers, raceways and cages, the heat treatment during manufacture, as well as the surface finish of all contact surfaces.
Spherical Roller Bearings
Spherical Roller Bearings,Spherical Ball Roller Bearing,Steel Spherical Roller Bearing,Asymmetrical Spherical Roller Bearings
Ningbo Ritbearing Imp & Exp Co.,Ltd. , http://www.ritbearingchina.com