Disassembly of gear pump

The structure of a gear pump is simpler than that of a centrifugal pump, but the disassembly work is more laborious and mainly zero
The components are heavy and require high installation accuracy. They are also suspended on the beam and must be disassembled
Attention must be paid to safety. The disassembly of the components of the water pump can be divided into two parts, now using vertical axial flow
Take the pump as an example to illustrate its disassembly process
]Dismantling of the upper base
Firstly, remove the screws of the elastic coupling, loosen the screws connecting the motor to the base, and remove the motor. Support the rigid coupling of the pumping unit with wooden blocks to prevent the pump shaft from falling down, and then remove it
The connecting screws of the cap nut and bearing gland on the transmission uranium are used to seal the coupling and tighten the transmission
Lift the shaft up to a certain height, then remove the joint cap and thread of the rigid coupling, and remove the elastic
The coupling can be used to extract the transmission shaft from the upper base. Remove the elastic coupling again and roll it
Remove the bearing from the transmission shaft using a special tool. At this point, all the upper machine seats have been disassembled
2. Removal of the lower pump body
First remove the water inlet bell mouth, and then use a special tool to lift the impeller at the lower end of the pump
Open it to remove the entire impeller. For the water pump equipped with a movable blade field, remove the water inlet valve
After the bell mouth is opened, disassemble the rotating blade ring and then disassemble the impeller.

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Will stainless steel sewage pumps rust?

Customers usually believe that stainless steel centrifugal pumps will not rust, and rust is not a stainless steel pump. When brown rust spots (spots) appear on the surface of the stainless steel pump, the customer believes that there is a problem with the steel. In fact, this is a misconception about a lack of understanding of stainless steel. In some cases, stainless steel can also rust. There are many forms of damage to such surface facial mask. The following are common phenomena in daily life:
1. The surface of stainless steel contains dust or other metal particles attached to other metal elements. In humid air, the condensed water between the attached material and stainless steel connects the two to form a miniature battery, leading to a chemical reaction that generates electricity. The destruction of the protective film is called electrochemical corrosion.
As shown in Figure 2, in the presence of water and oxygen, the surface of stainless steel adheres to organic juices (such as melons, noodle soup, glutinous rice, etc.), forming organic acids that corrode the metal surface for a long time.
3. The surface of stainless steel adheres to acid, alkali, and salt substances (such as alkaline water and lime water splashed onto the wall), causing local corrosion.
4. In polluted air (such as atmospheres containing large amounts of sulfides, carbon oxides, and nitrogen oxides), liquid points of sulfuric acid, nitric acid, and acetic acid can form in the presence of condensed water, leading to chemical corrosion.
All of the above situations can cause corrosion and rusting of the protective film on the surface of stainless steel.
Therefore, to ensure that the metal surface is bright and does not rust, we recommend:
1. The surface of decorative stainless steel must be regularly cleaned and scrubbed to remove deposits and eliminate external factors that cause modification.
2. Coastal areas should use 316 stainless steel, which can resist seawater corrosion.
3. Some chemical components of stainless steel pipes on the market cannot meet the corresponding national standards and cannot meet the requirements of 304 materials. Therefore, it can also cause rusting, which requires users to carefully select products from reputable manufacturers.

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Differences in self priming centrifugal pumps

In order to better discharge the gas in the suction pipeline and generate a certain vacuum value during the operation of general centrifugal pumps, exhaust pipe measures must be adopted. For small pumps, the pump casing and water inlet must be filled with water before starting. In order to better avoid water jumping, a single side water pump bottom valve is installed at the bottom of the water inlet that opens when water flows up and closes when it flows down; Generally, centrifugal pumps with large water seepage specifications above 300mm are not equipped with bottom valves, but only use professional vacuum equipment to vacuum drinking water. There is no doubt that starting the water supply pump will cause inconvenience and lead to hasty consumption.
Principle: Centrifugal pumps operate by using the rotation of the impeller to generate centrifugal motion of water. Before starting the water pump, it is necessary to fill the pump casing and suction pipe with water. Then, start the electric motor to push the impeller and water to perform high-speed running fitness exercise. The water produces centrifugal motion and is thrown towards the edge of the impeller. It is then injected into the pressurized water pipeline of the water pump through the gate of the volute pump casing.
Structure: A centrifugal pump operates by using the rotation of the impeller to generate centrifugal motion of water. The main structure of a centrifugal pump is composed of six parts: impeller, pump casing, pump shaft, rolling bearing, sealing ring, and sleeve joint.
The structural type of self priming centrifugal pumps has been improved, overcoming the shortcomings of general pipeline centrifugal pumps. The advantage of a self priming centrifugal pump is that the pump casing is a double vortex shell structure. The detergent outlet is located on the edge of the water pump impeller, and there is a large capacity vapor liquid separation chamber above the outlet. Other structures are similar to single pole single suction centrifugal pumps, including sealing rings, machine seals, shafts, and rolling bearings. When starting the self priming pump for the first time during operation, it is necessary to introduce a diversion channel into the pump casing, and the amount of introduction should exceed the centerline of the pump within the pump casing. Afterwards, the fully automatic suction pipe can be started anytime and anywhere, without the need to introduce water into the diversion channel, making the application more convenient than pipeline centrifugal pumps.
Principle: The design principle of a self priming water pump is to fill the pump casing with water (or the pump casing itself has water) before starting the pump. After startup, the high-speed operation of the impeller causes the water in the impeller channel to flow towards the vortex shell. At this time, a vacuum pump is generated in the channel, causing the water seepage check valve to open. The gas in the suction pipe enters the pump and reaches the edge through the impeller channel.

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Can a self priming pump be used for low water levels

Self priming pump is a common type of water pump, whose main feature is that it can draw liquid on its own without the need for external water supply. Therefore, self priming pumps are widely used in many fields, such as industry, agriculture, construction, and so on. However, is a self priming pump suitable for use at low water levels?
This article will explore the working principle of self priming pumps, the definition of low water level, and the applicability of self priming pumps.
Firstly, we need to understand the working principle of self priming pumps. A self priming pump is a centrifugal pump that works by drawing liquid into the pump body through centrifugal force, and then compressing and discharging the liquid through the impeller inside the pump body. The suction and discharge pipelines of a self priming pump are connected, thus forming a closed space inside the pump body. When the pressure inside the pump body is lower than atmospheric pressure, the liquid will be sucked into the pump body. Therefore, the suction height of a self priming pump is limited, usually around 5 meters.
Next, we need to understand the definition of low water level. Low water level refers to the water level being lower than the suction height of the self priming pump, which means that when the water level is below 5 meters, the self priming pump cannot function properly. This is because the working principle of a self priming pump requires the formation of a closed space inside the pump body, and under low water levels, there is insufficient negative pressure inside the pump body to absorb liquid.
Finally, we need to understand the applicability of self priming pumps. Self priming pumps are suitable for sucking liquids such as clean water, sewage, oil, etc. However, for liquids containing solid particles or fibers, the effectiveness of self priming pumps may be affected.
In addition, the suction height of the self priming pump is limited, so it is necessary to choose the appropriate pump type and installation position according to the actual situation when using it. In summary, the self priming pump cannot operate normally under low water levels, so it is necessary to consider the actual situation when selecting the pump type and installation location. If pumps need to be used at low water levels, other types of pumps, such as submersible pumps, centrifugal pumps, etc., can be considered.

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Vacuum assisted self priming centrifugal pump

1、 Overview of Vacuum Assisted Self priming Centrifugal Pump Products
Vacuum assisted self priming centrifugal pumps are currently widely used in vacuum assisted self priming centrifugal pump trucks. Due to the slow self priming time and low self priming height when using conventional self priming centrifugal pumps on pump trucks, vacuum assisted systems have been added to self priming centrifugal pump trucks in the pump industry. Vacuum self priming centrifugal pumps have been updated and replaced with several generations of vacuum assisted self priming centrifugal pump products, The new model belongs to a vacuum assisted self priming centrifugal pump product that can self suck up to 8 meters without vacuum assistance. On the basis of the vacuum assisted self priming centrifugal pump product, a vacuum assisted self priming centrifugal pump product with a vacuum assistance system has been added. In the case of a malfunction in the vacuum assisted system, this series can also self suck up to a height of 8 meters and 8 meters in 5 minutes. In the past, when the vacuum assisted self priming centrifugal pump had a malfunction in the vacuum assisted system, the self priming height of the self priming centrifugal pump was only about 4-5 meters Moreover, the self priming time is relatively slow and cannot achieve the effect of emergency rescue when used in flood prevention and rescue operations. Therefore, the newly developed vacuum assisted self priming centrifugal pump will be a more suitable product for the use of vacuum assisted self priming centrifugal pump trucks.
2、 Main characteristics of vacuum assisted self priming centrifugal pump
1. The 2019 vacuum assisted self priming centrifugal pump can achieve a self priming height of up to 8 meters without a vacuum pump.
2. The newly developed open impeller of vacuum assisted centrifugal pump has good anti clogging effect, and the diameter of solid particles is much larger than that of previous self priming centrifugal pumps. The 150 caliber can pass through 75mm.
3. The vacuum assisted self priming centrifugal pump can reach a self priming height of 9 meters without cavitation, and the self priming horizontal distance can reach 150 meters.
4. The impellers of vacuum assisted self priming centrifugal pumps are all made of stainless steel material, ensuring a longer service life. The pump body is made of ductile iron material, and the pump shaft is made of 3Cr13 material.
5. The vacuum assisted self priming centrifugal pump motor can use a permanent magnet energy-saving motor, and the flow head can be adjusted according to user needs to make the motor speed more energy-saving and meet the requirements of China's energy-saving product certification.
6. The diesel engine matched with the vacuum assisted self priming centrifugal pump truck can be selected from domestic or imported brands according to user needs, and the diesel engine speed can be 1500, 1800, and 3000r/min for different requirements.
7. The bottom of the vacuum assisted centrifugal pump body is equipped with an independent drain valve for draining water after use. And there is an independent maintenance port with a diameter of 150mm. During maintenance, the pump body and motor can be repaired without disassembling, which is convenient and fast.

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Misunderstandings in the operation and use of pipeline centrifugal pumps

 

1. Pipeline centrifugal pumps are matched with some pipeline centrifugal pumps. Users believe that this can increase the actual head, but in fact, the actual head of the water pump is equal to the total head to the loss head. After the water pump model is determined, the total head is fixed; The loss of head mainly comes from pipeline resistance. The smaller the pipe diameter, the greater the resistance, and therefore the greater the loss of head. Therefore, reducing the pipe diameter not only does not increase the actual head of the water pump, but also reduces it, leading to a decrease in pump efficiency. Similarly, when a small diameter water pump uses a large water pipe for pumping, the actual head of the pump will not be reduced. Instead, the loss head will be reduced due to the decrease in pipeline resistance, resulting in an increase in actual head.
2. High head water pumps are used for low head pumping. Some pipeline centrifugal pumps users believe that the lower the pumping head, the smaller the motor load. Under the misleading misconception, when choosing a water pump, the head of the pump is often chosen too high. In fact, for centrifugal pumps, when the pump model is determined, the power consumption is directly proportional to the actual flow rate of the pump. The flow rate of the water pump will decrease with the increase of the head, so the higher the head, the smaller the flow rate, and the smaller the power consumption. On the contrary, the lower the head, the greater the flow, and the greater the power consumed.
3. If there are too many elbows on the inlet pipeline of the centrifugal pump in the pipeline, it will increase local water flow resistance. And the elbow should turn in the vertical direction, and it is not allowed to turn in the horizontal direction to avoid gathering air.
4. When installing the water inlet pipeline, the horizontal section should be horizontal or upward. This will cause air to accumulate in the water inlet pipeline, reduce the vacuum degree of the water pipe and water pump, and reduce the suction head and water output of the water pump. The correct approach is to tilt the horizontal section slightly towards the direction of the water source, not horizontally, and not upward.
5. The inlet of the pipeline centrifugal pump is directly connected to the elbow, which will cause uneven distribution of water flow when passing through the elbow and entering the impeller. When the diameter of the inlet pipe is greater than that of the water pump inlet, an eccentric reducing pipe should be installed. The flat part of the eccentric reducer should be installed above, and the inclined part should be installed below. Otherwise, air will accumulate, water output will decrease or water cannot be pumped, and there will be a sound of impact. If the diameter of the inlet pipe is equal to that of the water pump inlet, a straight pipe should be added between the water pump inlet and the elbow, and the length of the straight pipe should not be less than 2-3 times the diameter of the water pipe.
6. If the outlet of the pipeline centrifugal pump is above the normal water level of the outlet pool, although the pump head is increased, the flow rate is reduced. If the water outlet must be higher than the water level of the water tank due to terrain conditions, elbows and short pipes should be installed at the pipe mouth to make the water pipe a siphon type and reduce the height of the water outlet.
7. When installing the bottom valve, the lower section of the inlet pipe is not vertical. If installed in this way, the valve cannot close on its own, causing water leakage. The correct installation method is to install the inlet pipe with a bottom valve, and ensure that the next section is vertical. If vertical installation is not possible due to terrain conditions, the angle between the water pipe axis and the horizontal plane should be above 60 °.

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Teach you how to correctly select a diaphragm pump diaphragm

Shanghai Pump Manufacturing Co., Ltd. teaches you how to correctly select a diaphragm to achieve twice the result with half the effort. The main component of a diaphragm pump is the diaphragm, so users must indicate the nature of the conveying medium when ordering, so that different diaphragms can be equipped at the factory. Generally, there are several types of diaphragms:
1. Ding Qing diaphragm is mainly used in oil resistant applications.
2. Neoprene rubber 5031 # is specially made by our company and is mainly used for resistance to acetone and various acids and alkalis.
3. Fluorine rubber 6021 # is specially made by our company and is mainly used for high temperature 150 ℃, toluene resistance, and corrosion resistance. But the price is higher than other diaphragms.
4. Food rubber, specifically used for the transportation of food and beverages.

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