1. Single screw pump concept
Single screw pump is a new type of internal rotary reciprocating positive displacement pump. The main working parts are eccentric screw (rotor) and fixed bushings (stator).
Compared with other pumps, the advantages of single screw pump
Compared with the centrifugal pump, single screw pump does not require valves installed, and flow is a steady linear flow.
Compared with the plunger pump, single screw pump has better self-suction capacity.
Compared with the diaphragm pump, single screw pump can convey a variety of mixed impurities, containing gas and solid particles or fibers of the media, but also convey a variety of corrosive substances.
Compared with the gear pump, single screw pump can deliver high viscosity substances.
Unlike plunger pumps, diaphragm pumps and gear pumps, single-screw pumps can be used for filling and metering medications.
1 screw pump basic working principle
Screw pump is the use of screw rotation to suction and discharge liquid. Figure 1 shows a cross-sectional view of a three-screw pump. In the picture, the middle screw is the active screw which is driven by the prime mover. The screw on both sides is the driven screw, which rotates reversely with the active screw. The main, driven screw thread are double-headed thread.
Due to the mutual engagement of the screws and the tight fit of the screw with the inner wall of the liner, one or more sealed spaces are separated between the suction and discharge of the pump. As the screw is rotated and engaged, these sealed spaces are constantly formed at the suction side of the pump, the liquid in the suction chamber is enclosed therein and continuously displaced in the axial direction of the screw from the suction chamber to the discharge end, to be enclosed in the spaces Continued discharge of liquid, like a nut in the screw rotation is constantly moving forward, as the case, which is the basic working principle of screw pump.
The sealing surface between the screw and the housing is a curved surface. There are unsealed areas such as ab or de on this surface and a number of triangular notches abc, def with the groove portion of the screw. The notches of these triangles form a passage for the liquid, allowing the drive screw groove A to communicate with the grooves B, C in the driven screw. The grooves B, C, along with their spiral around the back, respectively, and the back of the grooves D, E communicated. Since there are also triangular notches a'b'c 'similar to the front face on the sealing surfaces where the grooves D, E engage with the groove F (which belongs to the other thread), D, F, E will also communicate. In this way, the groove ABCDEA also form a "∞" -shaped sealing space (such as the use of single-head thread, the groove will be along the axial disk Rao screw, the suction port through, can not form a seal). Not hard to imagine, in such a screw, will form a number of independent "∞" -shaped sealed space, each sealed space occupies the axial length exactly equal to the lead of the tired rod t. Therefore, in order to make the suction and discharge of the screw, the length of the screw thread should be longer than one lead.
This article Keywords: screw pump
Tower Crane cabin is the control center of the crane and is attached to the slewing unit. In order to get to the tower crane cab, the operator must climb a series of ladders within the mast.
The movement of the tower crane is controlled from the operator's cabin. Within the tower crane cabin, you'll find the operator's chair with joystick controller, electronic monitoring devices, and communication systems. Many cabins come with climate control to ensure a comfortable work environment. The Operator Cabin for Tower Crane is part of the slewing assembly.
A cabin for a tower crane is a small enclosed space located at the top of the tower crane Mast Section or tower crane jib. It is where the crane operator sits and controls the crane's movements and operations. The tower crane cabin is typically made of steel or aluminum and is designed to provide a safe and comfortable working environment for the operator. It is equipped with controls, instruments, and communication systems that allow the operator to maneuver the crane, lift and lower loads, and communicate with other personnel on the construction site. The cabin is often equipped with heating and air conditioning systems to ensure the operator's comfort in various weather conditions. Safety features such as guardrails, harness attachment points, and emergency controls are also included in the cabin design to protect the operator in case of accidents or emergencies.
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