Foreword: The submerged pump is a single-screw type transport pump. The main working components of the submerged pump are the screw of the eccentric spiral body (called the rotor) and the screw bush (called the stator) with the double-thread spiral surface on the inner surface. The working principle is that when the motor drives the pump shaft to rotate, the screw rotates around its own axis on the one hand and it rolls along the inner surface of the bush on the other hand, thus forming a sealed chamber of the pump. Every revolution of the screw, the liquid in the sealing chamber is advanced by a pitch. With the continuous rotation of the screw, the liquid spirally presses from one sealing chamber to the other and finally the pump body is extruded. The submerged pump is a new type of liquid conveying machine, which has the advantages of simple structure, safe and reliable operation, convenient use and maintenance, continuous and uniform liquid discharge, stable pressure, and the like. A pump that uses the rotation of a screw to suck and discharge liquids. It is best suited for sucking and discharging viscous liquids.

The submerged 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 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 between the screw and the inner wall of the liner, the suction port and the discharge port of the submerged pump are partitioned into one or more sealed spaces. 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 rotating. This is the basic working principle of a submerged pump.

The sealing surface between the screw and the housing is a spatial curved surface. There is an unsealed area such as ab or de on this curved surface, and many triangular shaped notches abc, def are formed with the groove portion of the screw. The openings of these triangles constitute the channels of the liquid, so that the drive screw groove A communicates with the grooves B, C on the driven screw. The grooves B and C are wound along their own spirals to the back surface, and communicate with the grooves D and E on the back surface respectively. Since there is also a triangular recess similar to the front face a'b'c' on the sealing surface where the grooves D, E and the groove F (which belong to the other head thread) meet, D, F, E will also communicate. In this way, the recess ABCDEA also constitutes an “∞” shaped sealed space (if a single head thread is used, the groove will follow the axial disc and the screw will penetrate the suction and discharge port and cannot form a seal). It is not difficult to imagine that on such a screw, many independent “∞” shaped sealed spaces will be formed, and each sealed space occupies an axial length that is exactly equal to the lead t of the rod. Therefore, in order to separate the screw suction and discharge ports, the length of the threaded section of the screw must be greater than at least one lead.

From the above working principle, it can be seen that the submerged pump has the following advantages:

1) Wide pressure and flow range. The pressure is about 3.4-340 kgf/cm2 and the flow rate can reach 18600cm3/min;

2) Wide range of types and viscosities of liquids to be transported;

3) Because the inertial force of the rotating parts in the submerged pump is low, high speed can be used;

4) Good suction performance, self-priming ability;

5) Flow is even and continuous, vibration is small, and noise is low;

The disadvantage of the submerged pump is that the processing and assembly requirements of the screw are high; the performance of the pump is sensitive to changes in the viscosity of the liquid.

The working part of the submerged pump is submerged in the liquid and there is no leakage of the shaft seal. It has small footprint, reliable use, easy maintenance, and strong corrosion resistance. Submerged pumps are widely used in chemical, pharmaceutical, paper, petroleum and other industrial sectors.

The vertical motor of the submerged pump is fastened to the motor base with bolts, and is directly connected to the pump through the elastic coupling, the pump body, the Intermediate pipe, the pump frame, the liquid outlet pipe, and the flange of the pipe. On the bottom plate, the entire submerged pump is mounted on the container through the bottom plate. The axial and radial forces of the pump (including the water pressure generated during the operation of the pump, the weight of the impeller and the rotor, etc.) are all comprised of one-way thrust ball bearings, single row radial ball bearings, and sliding guides. The shaft is subjected to the normal operation of the pump to ensure safety. The bearings are lubricated with butter, and the guide bearings are lubricated with the liquid being transported. Therefore, the liquid level must be higher than the centerline of the impeller when the submerged pump is operating. Different lengths of the length of the container into the L, it is divided into the middle guide bearing structure and no intermediate guide bearing structure.

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