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Aug 31,2022

Requirements for the use of four types of centrifugal pumps

The first is the cleaning and inspection requirements of centrifugal pumps. Proper cleaning helps maintain the life of the pump and reduces unnecessary losses. Taking the stainless steel centrifugal pump as an example, the pump cannot be disassembled at will during the warranty period, and only the surface contaminants can be cleared; when the time exceeds the warranty period, the first thing to understand about the stainless steel centrifugal pump is that the end surface of the stainless steel centrifugal pump cannot be scratched or scratched during the cleaning process. Scratches, once washed with clean water, immediately apply lubricating oil on the surface of parts and equipment to ensure that it will not cause rust; the second is that the vertical mid-section of the pump casing cannot be disassembled, and cleaning should be avoided as much as possible; the third is the impeller Components and cooling water pipes must be cleaned. The second is the alignment requirements for stainless steel pipeline pumps. First, it is required that the drive shaft and the pump shaft, the drive shaft and the transmission shaft should be connected in accordance with the regulations. If there is no connection standard during the purchase period, Zhao Zheng must be familiar with the "Mechanical Equipment Installation Engineering Construction and Acceptance General" before. Specifications, and use it as a reference material is strictly required. These alignment requirements are all data generated through repeated experiments, and no one should change them at will.

Aug 31,2022

How to disassemble a centrifugal pump, attention to detail is the key

Have you ever disassembled a single stage centrifugal pump? If you want to disassemble such a huge piece of machinery, you must first have a comprehensive understanding of the centrifugal pump, and be able to know every detail inside. In fact, the single-stage centrifugal pump is different from the horizontal multi-stage centrifugal pump. As a kind of stainless steel centrifugal pump, its internal structure is relatively simple. The following Wenzhou Zhongnai Pump Valve will explain how to disassemble the single-stage centrifugal pump. First, cut off the power supply before disassembly to ensure safety during disassembly. Then close the outlet and inlet valves to isolate the external medium source to ensure the interference of unfamiliar foreign objects. At the same time, open the liquid release valve to release the residual pressure in the pump into the air, so that there is no impurities as much as possible. At this time, you can remove the motor base bolts, separate the motor from the pump body, and the first step of disassembly is successfully completed. The second is the disassembly of the pump body. The single-stage centrifugal pump is not as complicated as the stainless steel chemical centrifugal pump. First, remove the base bolts of the pump body and the fastening bolts of the back cover of the pump, and then remove the pump body. Tap the nut with a hammer to release the rust layer so that the foot bolt can be easily screwed. In addition, when the pump cover fastening bolt is located at the connection between the pump body and the pump cover, the corrosion phenomenon is particularly obvious. Because this position is relatively fragile, it cannot be hit with a hand hammer, but can only be rotated gently, which is difficult to disassemble.

Aug 31,2022

The role of pipeline centrifugal pump and installation skills

The correct installation methods for the pipeline centrifugal pump are as follows, because the working mechanism of the pipeline centrifugal pump is to allow the water or liquid to obtain kinetic energy under the action of centrifugal force through the action of the rapidly rotating impeller. Among them, the main points of the installation technology of the pipeline centrifugal pump are: the determination of the installation height of the pump, the middle distance between the water supply surface and the impeller component is the installation height, and the absolute vacuum height is generally indicated on the pump instruction manual and nameplate. At a standard atmospheric pressure and the water temperature is controlled between 20 and 30 degrees Celsius, the distance between the water surface of the water inlet and the section mouth gives the height of this vacuum, which is determined by experiment. However, the disadvantage of this method is that it does not consider the collocation of the size of the water flow and the suction pipe behind. Therefore, the installation height theoretically needs to deduct the lost energy to obtain the height of the vacuum, and then the remaining value is the real value, which can overcome the problems of terrain height and water absorption height in the actual situation. Otherwise the pressure provided by the pump will not pump the water up.

Aug 31,2022

What are the structure and characteristics of centrifugal oil pump?

What are the structure and characteristics of centrifugal oil pump? Answer: Generally, centrifugal oil pumps have many structural forms, including single-stage single-suction and single-stage double-suction cantilever structures; two-stage single-suction and two-stage double-suction support structures at both ends; and multi-stage segmented structures. formula and other structural forms. Their internal structure is roughly the same as the corresponding general centrifugal pumps, but they generally have the following characteristics: 1. In order to reduce the influence of temperature on the pump shaft, the support of the pump body is mostly in the center. For some oil pumps with high conveying temperature, in order to prevent the eccentric movement or jamming of the pump due to thermal expansion during operation, there are generally positioned sliding guides at the bottom of the pump. 2. According to the different temperature and corrosion degree of the conveyed liquid, three types of materials are used for main parts such as pump cover, pump body and impeller. The first category is cast iron, which is not resistant to corrosion, and the operating temperature is -20~200℃. The second category is cast steel, which is not resistant to corrosion, and the operating temperature is -45~400 °C. The third category is alloy steel, which is resistant to medium sulfur corrosion, and the operating temperature is -45~400 °C.

Aug 31,2022

The arrangement and foundation of the pump unit

1. The arrangement of the pump unit The arrangement of pump units is an important part of the arrangement in the pump station, which determines the size of the construction area of ​​the pump room. The unit spacing is based on the principle of not hindering the needs of operation and maintenance. The layout of the unit should ensure safe operation, convenient loading and unloading, maintenance and management, short total pipeline length, small joint fittings, and small head loss, and the room for expansion of the pumping station should be considered. The basic forms of unit arrangement are as follows. 1. vertical arrangement When arranged longitudinally, the axes of each pump unit are parallel, as shown in Figure 1. The longitudinal arrangement is compact, the motor shaft is convenient to pull out, and the building area is small, but the pump room has a large span, many pipe fittings, and poor hydraulic conditions. Generally, bridge cranes are required for hoisting. Longitudinal arrangement is suitable for example IS single-stage single-suction cantilever centrifugal pump. Since the top of the cantilever pump system enters the water, the vertical arrangement can keep the suction pipe straight (Pump 1 in Figure 1). If there are centrifugal pumps with both lateral inlet and lateral outlet in the pump room (both pumps 2 in Figure 1 are SH type or SA type pumps), the scheme of longitudinal arrangement is debatable. If the SH-type pumps are in the majority, the longitudinal arrangement is not desirable. For example, when the 20SH-9 pump is arranged vertically, the width of the pump plus the size of the suction nozzle and the length of two 90° elbows totals 3.9m (Figure 2). If it is arranged horizontally, the width of the pump is 4.1m, and its width is not much larger than that of the vertical row, but the hydraulic conditions of the inlet and outlet are greatly improved, which can save a lot of power consumption in long-term operation.

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