First, the health-screw Product Overview: health is by circuitous turn screw engaging new kinds of positive displacement pump principle of work, the main working parts are eccentric screw (rotor) and fixed bushing (stator). Because of the special geometry of the two components, namely the formation of a separate sealed cavity, medium implemented by the uniform axial flow, internal flow rate is low, the volume remains the same, pressure is stable and does not generate eddy currents and agitation. Each pump output pressure is 0.6MPa, head 60m (water), apply to the transmission medium temperature below the 80 ℃ (special requirements of up to 150 ℃). The stator is made because the choice of a variety of flexible materials, so this pump for high viscosity fluid delivery and contain hard suspended particulate media or transport medium containing fiber, has a general kind of incompetence pump characteristics. Proportional to flow and speed. Transmission can be direct drive coupling, or the use of variable speed motors, belt, gear transmissions and other means. This little pump parts, compact structure, small size, easy maintenance, the rotor and stator is wearing parts of the pump, simple structure, easy assembly and disassembly. Second, the health-screw advantages: 1) The wide range of pressure and flow. A pressure of about 3.4-340 kgf / cm 2, the flow rate of up to 18600cm3 / min; 2) transporting the liquid type and a wide viscosity range; 3) because of the lower inertia force rotating member within the pump, it is possible to use a high speed ; 4) Inhalation good performance, with self-absorption capacity; 5) a uniform continuous flow, vibration, low noise; 6) compared with other rotary pumps, gas and dirt to enter the less sensitive; 7) solid structure installation maintenance easy. Sanitary screw disadvantage is that the higher the screw machining and assembly requirements; pump performance liquid viscosity sensitive. Third, the health-screw structure: It is mainly composed of a fixed bushing (pump cylinder) in the pump body and placed in the pump cylinder in the active screw and driven screw engages with its two formed. Three screws meshing with each other, in the pump cylinder for each lead is formed into a sealed chamber, causing the seal between the suction port. When the pump is working, because the two driven screw with the active screw symmetrical engagement, it acts on the active screw radial forces perfectly balanced, active screw is not subjected to bending loads. Driven screw suffered radial force along its entire length supported by the pump to the cylinder liner, and therefore, does not require a separate bearing outer end, substantially not subjected to bending loads. In operation, an oil film is formed between the outer circumferential surface of the screw and of the cylinder wall, prevents direct contact between the metal and the screw tooth wear surface is greatly reduced. When stainless steel single screw pump work, the role of both ends of the suction pressure of the liquid, so the screw to produce axial thrust. For the pressure is less than 10 kg force / cm2 small pump thrust bearing can be used. In addition, through the central hole of the screw will be active high-pressure oil introduced into the bottom of each of the screw sleeve, thereby generating an axial thrust in the direction opposite to the lower end of the screw balance thrust. Screw pumps and other positive displacement pump, as the pump outlet when completely closed, the pressure in the pump will rise to cause damage to the pump or the motor overload level of risk. Therefore, in the suction port of the pump, it is necessary to set up a safety valve. Stainless steel single screw pump seal, usually mechanical seal, and may take different forms depending on the level of work pressure. Fourth, sanitary screw it works: sanitary screw is the use of screw rotation to suction fluid. Due to the close intermeshing with each screw and screw and liner tube wall, between the suction port and the discharge outlet of the pump, it will be divided into one or more of the sealed space. With the rotation and intermeshing screws, which are sealed space in the suction side of the pump evolving, the suction chamber in which liquid is sealed, and from the suction chamber along the screw axis continuously push to move the discharge end, it will be closed in the space continuous discharge of liquid, like the case of a nut rotation in the thread that is constantly moving forward, and this is when the vertical screw pump, the liquid is sucked into the thread and pump housing sealed enclosed space, when the active screw rotation , screw sealed volume increase in the screw thread of the extrusion pressure, and move in the axial direction. As the screw is constant rotation, so the liquid effluent flow is uniform. Fifth, sanitary screw technical parameters: Flow: 0-150m3 / h; Head: 0-240m; power: 0.75-37kw; Speed: 500-960r / min; diameter: 20-135MM; temperature: -15-200 ℃ .