A, 3G series of three-screw pump structure features The screw pump is transported by the liquid in the pump for continuous, uniform linear motion, no stirring, pulse is small, so the flow, pressure, stable, stable operation, vibration, noise.
The screw pump has a high self-priming capability and does not require a bottom valve or vacuum attachment.
The driving screw is driven by the motor. The driven screw is driven by the liquid pressure. Between the screws, there is oil film protection between the screw and the pump sleeve. The mechanical friction of the pump is small, so the pump has high efficiency and long service life.
The pump has a single suction, double suction, horizontal and vertical, to protect the pump, motor and piping system, the pump with a safety valve.
Second, the scope of application of 3G series three screw pump:
The three-screw pump is suitable for conveying lubricious liquids free of solid particles, non-corrosive, lubricious oils and similar oils with a viscosity of 1.2-1000 E (3-760 mm2/s) and a temperature of ≤150°C.
The 3G triple screw pump is mainly composed of a bush (pump cylinder) fixed in the pump body, and an active screw inserted in the pump cylinder and two driven screws meshed therewith. Three intermeshing screws are formed in the pump cylinder as a sealed chamber for each lead, resulting in a seal between the suction and discharge ports. When the pump is working, since the two driven screws and the driving screw are symmetrically engaged with each other, the radial force acting on the driving screw is completely balanced, and the driving screw does not bear the bending load. The radial force exerted by the driven screw is supported by the cylinder liner along its entire length. Therefore, there is no need to provide a separate bearing at the outer end, and substantially no bending load. During operation, a layer of oil film is formed between the outer surface of the screw and the inner wall of the pump cylinder to prevent direct contact between the metal and greatly reduce the wear of the screw tooth surface. When the screw pump works, the suction pressure of the liquid acts on both ends, so that an axial thrust is generated on the screw. For small pumps with a differential pressure of less than 10 kgf/cm2, thrust bearings can be used. In addition, high-pressure oil is introduced into the bottom of each screw shaft sleeve through the central oil hole of the drive screw, thereby producing a balanced thrust at the lower end of the screw opposite to the axial thrust force. The screw pump, like other positive displacement pumps, when the outlet of the pump is completely closed, the pressure in the pump rises to the point of causing damage to the pump or overloading the motor. Therefore, at the suction and discharge port of the pump, a safety valve must be provided.
The three-screw pump uses the rotation of the screw to suck and discharge the liquid. The middle screw is the active screw, which is driven by the prime mover. The screw on both sides is the driven screw, and it rotates in reverse with the active screw. The threads of the main and driven screws are double-ended threads. Due to the mutual engagement of the screws and the close fit of the screw with the inner wall of the liner, it is divided into one or more sealed spaces between the suction inlet and the discharge outlet of the pump. With the rotation and engagement of the screw, these sealed spaces are continuously formed at the suction side of the pump, the liquid in the suction chamber is sealed therein, and the suction chamber is continuously pushed along the axial direction of the screw to the discharge end, and will be enclosed in each space. The continuous discharge of liquid is like a nut that is continuously pushed forward while the screw is turning. This is the basic working principle of the screw pump.
From the above working principle, it can be seen that the screw pump has the following advantages: 1) The pressure and flow range are wide. The pressure is about 3.4-340 kgf/cm2, and the flow rate can reach 18600cm3/min; 2) The range of the liquid to be transported and the viscosity are wide; 3) Because the inertial force of the rotating parts in the pump is low, the high speed can be used. 4) Good inhalation performance and self-priming ability; 5) Uniform flow, low vibration, low noise; 6) Less sensitive to incoming gas and dirt than other rotary pumps; 7) Solid structure, installation Easy to maintain.
The disadvantage of the screw pump is that the screw has high machining and assembly requirements; the performance of the pump is sensitive to changes in the viscosity of the liquid.
Working principle: The screw pump is a push-type displacement pump. The main components are the rotor and the stator. The rotor is a large-lead high-tooth and high-height screw inner stator (rotor) stator is matched with the double-headed spiral and the screw sleeve. This creates a space for the storage medium between the rotor and the stator. When the rotor is operating in the stator, the medium moves axially from the suction end toward the discharge.
Features The spiral seal line that the stator and the rotor are in contact with each other completely separates the income chamber from the discharge chamber, so that the pump has the function of blocking the valve. The volume of the fluid in the multi-phase pump with liquid, gas, and solid does not change, and there is no flow The volume chamber formed by agitating and pulsed elastic stators can effectively reduce the wear when transporting medium containing solid particles. Viscosity up to 50000Mpa·s Solid content up to 50%
Flow and speed are proportional to the amount of self-regulating pump can be achieved with the governor pump can be forward and backward delivery.
The screw pump has a high self-priming capability and does not require a bottom valve or vacuum attachment.
The driving screw is driven by the motor. The driven screw is driven by the liquid pressure. Between the screws, there is oil film protection between the screw and the pump sleeve. The mechanical friction of the pump is small, so the pump has high efficiency and long service life.
The pump has a single suction, double suction, horizontal and vertical, to protect the pump, motor and piping system, the pump with a safety valve.
Second, the scope of application of 3G series three screw pump:
The three-screw pump is suitable for conveying lubricious liquids free of solid particles, non-corrosive, lubricious oils and similar oils with a viscosity of 1.2-1000 E (3-760 mm2/s) and a temperature of ≤150°C.
The 3G triple screw pump is mainly composed of a bush (pump cylinder) fixed in the pump body, and an active screw inserted in the pump cylinder and two driven screws meshed therewith. Three intermeshing screws are formed in the pump cylinder as a sealed chamber for each lead, resulting in a seal between the suction and discharge ports. When the pump is working, since the two driven screws and the driving screw are symmetrically engaged with each other, the radial force acting on the driving screw is completely balanced, and the driving screw does not bear the bending load. The radial force exerted by the driven screw is supported by the cylinder liner along its entire length. Therefore, there is no need to provide a separate bearing at the outer end, and substantially no bending load. During operation, a layer of oil film is formed between the outer surface of the screw and the inner wall of the pump cylinder to prevent direct contact between the metal and greatly reduce the wear of the screw tooth surface. When the screw pump works, the suction pressure of the liquid acts on both ends, so that an axial thrust is generated on the screw. For small pumps with a differential pressure of less than 10 kgf/cm2, thrust bearings can be used. In addition, high-pressure oil is introduced into the bottom of each screw shaft sleeve through the central oil hole of the drive screw, thereby producing a balanced thrust at the lower end of the screw opposite to the axial thrust force. The screw pump, like other positive displacement pumps, when the outlet of the pump is completely closed, the pressure in the pump rises to the point of causing damage to the pump or overloading the motor. Therefore, at the suction and discharge port of the pump, a safety valve must be provided.
The three-screw pump uses the rotation of the screw to suck and discharge the liquid. The middle screw is the active screw, which is driven by the prime mover. The screw on both sides is the driven screw, and it rotates in reverse with the active screw. The threads of the main and driven screws are double-ended threads. Due to the mutual engagement of the screws and the close fit of the screw with the inner wall of the liner, it is divided into one or more sealed spaces between the suction inlet and the discharge outlet of the pump. With the rotation and engagement of the screw, these sealed spaces are continuously formed at the suction side of the pump, the liquid in the suction chamber is sealed therein, and the suction chamber is continuously pushed along the axial direction of the screw to the discharge end, and will be enclosed in each space. The continuous discharge of liquid is like a nut that is continuously pushed forward while the screw is turning. This is the basic working principle of the screw pump.
From the above working principle, it can be seen that the screw pump has the following advantages: 1) The pressure and flow range are wide. The pressure is about 3.4-340 kgf/cm2, and the flow rate can reach 18600cm3/min; 2) The range of the liquid to be transported and the viscosity are wide; 3) Because the inertial force of the rotating parts in the pump is low, the high speed can be used. 4) Good inhalation performance and self-priming ability; 5) Uniform flow, low vibration, low noise; 6) Less sensitive to incoming gas and dirt than other rotary pumps; 7) Solid structure, installation Easy to maintain.
The disadvantage of the screw pump is that the screw has high machining and assembly requirements; the performance of the pump is sensitive to changes in the viscosity of the liquid.
Working principle: The screw pump is a push-type displacement pump. The main components are the rotor and the stator. The rotor is a large-lead high-tooth and high-height screw inner stator (rotor) stator is matched with the double-headed spiral and the screw sleeve. This creates a space for the storage medium between the rotor and the stator. When the rotor is operating in the stator, the medium moves axially from the suction end toward the discharge.
Features The spiral seal line that the stator and the rotor are in contact with each other completely separates the income chamber from the discharge chamber, so that the pump has the function of blocking the valve. The volume of the fluid in the multi-phase pump with liquid, gas, and solid does not change, and there is no flow The volume chamber formed by agitating and pulsed elastic stators can effectively reduce the wear when transporting medium containing solid particles. Viscosity up to 50000Mpa·s Solid content up to 50%
Flow and speed are proportional to the amount of self-regulating pump can be achieved with the governor pump can be forward and backward delivery.
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