The submersible pump is made according to the length of the container (generally 1 to 1.5m). The working part of the submersible pump is immersed in the liquid, and the axial force and radial force generated by the operation of the pump are supported by rolling bearings and sliding bearings respectively; therefore, the operation is quiet and noiseless. There is no liquid splashing in the shaft seal. There is a cooling system at the packaging, which can take away the heat with cooling water according to the temperature of the medium used by the user. Key points for safe use of submersible pumps: 1. When purchasing a submersible pump, pay attention to the model, flow rate, and head. If the selected specifications are not appropriate, sufficient water output cannot be obtained, and the efficiency of the unit cannot be exerted. In addition, the direction of rotation of the motor must also be clarified. Some models of submersible pumps can produce water in both forward and reverse rotations, but the reverse water output is small and the current is large, which will damage the motor windings. In order to prevent electric shock caused by leakage when the submersible pump works underwater, a leakage protection switch should be installed. 2. When installing the submersible pump, the cable should be overhead and the power cord should not be too long. When the machine is launched, do not pull the cable hard to avoid breaking the power cord. Do not sink the submersible pump into the mud, otherwise it will cause poor heat dissipation and burn the electric 3. Try to avoid starting the machine at low voltage. The difference between the power supply voltage and the rated voltage should be 10%. If the voltage is too high, the motor will overheat and burn the windings. If the voltage is too low, the motor speed will decrease. If it is lower than 70% of the rated speed, the starting centrifugal switch will be closed, causing the starting winding to be energized for a long time, heating up and even burning the winding and capacitor. Do not switch the motor on and off frequently. This is because backflow will be generated when the electric pump stops running. If it is turned on immediately, the motor load will be started, resulting in excessive starting current and burning the winding. 4. Do not let the water pump run overloaded for a long time, and do not pump water with high sand content. The dehydration time of the electric pump cannot be too long to avoid overheating and burning of the motor. During the operation of the unit, the operator should always observe whether its working voltage and current are within the numerical range specified on the nameplate. If not, the motor should be stopped, the cause should be found and the fault should be eliminated. 5. Check the motor more often at ordinary times. If the lower cover is cracked, the rubber seal is damaged or failed, etc. It should be replaced or repaired in time to prevent water from seeping into the machine. Selection method of submersible pump: 1. Flow rate is one of the important performance data of submersible pump, which is directly related to the production capacity and transportation capacity of the whole device. The selection of pump is based on the flow rate, taking into account the normal flow rate. When there is no large flow rate, 1.1 times the normal flow rate is usually taken as the flow rate. 2. The head required by the device system is another important performance indicator of the submersible pump. Generally, the lift after the margin is enlarged by 5%-10% is used to select the model. 3. The pipeline layout conditions of the submersible pump system refer to the liquid supply height, liquid supply distance and liquid supply direction, so as to calculate the system head and check the cavitation margin. 4. Liquid properties, including the name, physical properties, chemical properties and other properties of the liquid medium. Physical properties include temperature C, density D, viscosity U, solid particle diameter and gas content in the medium. This includes calculating the system head, effective cavitation margin and appropriate pump type. Chemical properties mainly refer to the chemical corrosiveness and toxicity of the liquid medium, which is an important basis for selecting submersible pump materials and shaft seal types.

Long-axis pumps are vane pumps with large flow, small head, high specific speed, high efficiency, small footprint, and strong technical parameter flexibility. They are suitable for low-water-level submersible axial flow pumps. Therefore, they are often the pump type for agricultural and animal husbandry irrigation, water supply and drainage in large cities, and cooling circulating water transportation in power plants. The water drawn from the reservoir by the long-shaft pump is sucked into the bell tube. When the centrifugal impeller blades in the centrifugal impeller chamber force the water to rotate, the water enters the guide vanes. The magnetohydrodynamic power generation lifts the pump, flows through the pump barrel and is discharged from the drain elbow. The pump is connected to the connecting shaft by a coupling (rigid). The rolling bearing under the motor rubber support bears all the downward axial forces of the motor rotor. The connecting shaft is connected to the motor shaft through an elastic coupling. The centrifugal impeller (rim body) of the axial flow pump contains blades. Installation method of long-axis pump: 1. Axial flow pumps (especially large and medium-sized pumps) have strict requirements on the form and specifications of the water inlet flow channel, which directly endangers the characteristics of stainless steel plate deep well pumps (such as high efficiency and cavitation characteristics). A reliable design scheme (design scheme of the Planning Institute) should be adopted. 2. Wet pit installation means that all or part of the pump is immersed in the sealing liquid, and part of the pump is immersed in the suction tank; 3. Dry pit installation means that the pump is surrounded by gas, and the elbow suction channel is selected to enter the pump. Common problems in the installation of long-axis pumps: 1. When the long-axis axial flow pump uses a universal vertical motor control driver, the net weight and radial torque of the rotor of the long-axis axial flow pump motor should be mainly borne by the thrust ball bearing installed at the upper end of the long-axis axial flow pump. 2. When the long-axis axial flow pump uses a vertical structure motor control driver with a thrust ball bearing, the net weight and radial torque of the rotor of the long-axis axial flow pump motor are mainly borne by the thrust ball bearing in the motor. 3. When the long-axis axial flow pump adopts a bevel gearbox transmission system, the net weight and radial torque of the rotor of the long-axis axial flow pump motor should be borne by the thrust ball bearing installed in the bevel gearbox. 4. Lubrication of thrust ball bearings: Thrust ball bearings are generally lubricated with thin oil (small pumps can also be lubricated with other vegetable oils). The circulating water can be cooled by setting a refrigeration barrel clamp in the rolling and in vitro. Lubrication method of long-axis pump guide bearing: 1. Self-lubrication: If the material conveyed by the long-axis axial flow pump is a clean liquid, the guide bearing enterprise can be immediately lubricated by the material conveyed by the society. External management of working environment pressure and hydration: If there is a small amount of residue in the process of conveying the material by the long-axis axial flow pump, it must be moistened with clean working and living pressure water from the outside (the long-axis axial flow pump is equipped with a self-closing seal treatment system design software, which can effectively prevent the residue from directly entering the guide roller bearing after the long-axis axial flow pump is shut down). 2. Installation method: Generally, the long-axis axial flow pump generator set is installed on the same foundation layer. 3. Drainage position: If the customer needs to be located at the base layer, the drainage position is generally above the base layer.

The following introduces the selection of chemical process pumps. There are more and more application scenarios for chemical process pumps, and there are more and more chemical process pump products. Many friends do not know how to choose from so many chemical process pump products. Here are some ways to select chemical process pumps: 1. Make the form and function of the selected pump meet the requirements of process indicators such as installation flow, pump head, working pressure, ambient temperature, cavitation margin, suction head, etc. 2. The requirements of medium characteristics must be met: for pumps that transport flammable, explosive, harmful or precious media, the pump seal must be reliable or a non-exposed pump must be used, such as a magnetic pump (without a pump seal, and a discrete magnetic direct drive); for pumps that transport corrosive media, the convection components must be made of corrosion-resistant materials, such as fluoroplastic anti-corrosion pumps; for pumps that transport media containing solid particles, the convection components must be made of wear-resistant materials, and the pump seal must be flushed with clean liquid when necessary. 3. The equipment level requires strong reliability, low noise and low vibration. 4. Accurately calculate the purchase price of the pump. 5. When transporting highly corrosive substances (such as "sulfuric acid, concentrated sulfuric acid"), when transporting flammable and explosive materials, and when the application conditions cannot have any purification treatment: you can choose a magnetic drive pump, such as "CQB series magnetic drive pump, IMD series magnetic drive pump. If self-priming is required, you can choose FZB fluoroplastic self-priming pump. 6. 1HF centrifugal water pump and FSB centrifugal pump have the characteristics of high speed, small size, light weight, high efficiency, large flow, simple layout, no pulse when dripping, stable performance, easy control and convenient maintenance. If there are no special requirements for the application working conditions, it is better to choose a centrifugal water pump. 7. When transporting chemical media pumps containing solid particles, it is required that the heat convection components adopt wear-resistant materials: UHB mortar pump is a special tool. The material of UHB corrosion-resistant and wear-resistant mortar pump is high-toughness new engineering plastic UHBWPE, which is a modified material of ultra-high molecular weight (more than 5 million yuan) high-pressure polyethylene. In plastic, it has good wear resistance. Experimental comparison shows that its wear resistance is far better than stainless steel, and it has strong impact resistance, creep resistance and good corrosion resistance (equivalent to F4), and has special properties such as adhesion. 8. When the liquid level of the material is below the position of the pump equipment: it is advisable to use FZB fluoroplastic self-priming pump. If you also need to satisfy the characteristics of magnetic drive pump, you can use ZMD polyphenylene sulfide self-priming magnetic drive pump. 9. Select the model specification according to the performance trend chart of the pump: when the application requirements cannot find the appropriate specifications in the performance parameters, you can refer to the performance trend chart of the pump to select the appropriate pump type. Thank you for watching. If you need chemical process pumps or accessories, you can consult our company.

Next, I will tell you about the types of sealing forms of chemical process pumps. The sealing forms of chemical process pumps mainly include: skeleton seals, gasket seals, thread seals, labyrinth seals, rotary seals, dynamic seals and mechanical seals. 1. Oil seals It is a self-tightening mouth-shaped seal with compact structure, small size, low cost, convenient maintenance, and low torque resistance. It can prevent material leakage and external smoke and other harmful substances from invading. It has a certain level of compensation for damage, but it is not resistant to high pressure and is generally used in chemical process pumps in low voltage situations. 2. Gasket seals Gaskets are the basic components of centrifugal water pump packing seals and are widely used. The selection of sealing gaskets is mainly determined by factors such as the chemical process pump transport material, ambient temperature, and pressure corrosion. 3. There are generally two ways to seal chemical process pumps with threads, one is flange connection gasket sealing, and the other is thread filling sealing. Both methods are suitable for closed places with small-diameter flange connections. The hydraulic seal of the thread electric diaphragm pump gasket sealing is a gasket, and the thread only plays the role of giving tightening force. 4. Labyrinth seal has good effect under the conditions of reasonable planning, high-quality production and processing, intact installation and high speed. However, in practical applications, the leakage of chemical process pumps caused by it is relatively large, so it is not commonly used in the sealing of chemical process pumps. 5. Rotary seal sends the filling material with high expansion and tension into the ferrule joint, and relies on the axial pressure of the screw cap to convert it into radial sealing force, so it has a sealing effect. This sealing method is called rotary seal, and this type of filling material is called sealing filler. Rotary seals are widely used in the design of chemical process pumps because of their compact structure, convenient replacement, high quality and low price, and wide adaptability to speed and pressure materials. 6. Dynamic sealing During the operation of the chemical process pump, the pulling force generated by the auxiliary centrifugal impeller balances the high-pressure liquid at the inlet and outlet of the main centrifugal impeller to achieve sealing. After parking, the auxiliary centrifugal impeller is not started, and the parking seal structure is modified to alleviate the leakage of the chemical process pump that may occur after parking. The auxiliary centrifugal impeller seal has a simple structure, reliable sealing, and is durable. It can achieve tightness when the chemical process pump is running, and is mainly used in chemical process pumps that transport impurities. 7. Mechanical seal The chemical process pump field generally adopts mechanical seal sealing. Due to its small leakage and long service life, mechanical seal is currently an important way to seal the pump of this type of equipment. Mechanical seal is also called end seal. The definition in the technical standard is as follows: "It consists of at least one pair of vertical-a kind of device that, under the action of fluid pressure, compensation mechanism elasticity (or magnetism) and auxiliary sealing, makes the port directly touch the axis of rotation and slide relative to each other to prevent liquid leakage. Thank you for watching. If you need chemical process pumps or accessories, you can consult our company.

Talk about the application and maintenance of chemical process pumps. The problem of corrosion resistance of chemical process pumps has always been one of the headaches of chemical machinery and equipment. If you are not careful, the equipment will be damaged, and accidents or even disasters will occur. According to relevant estimates, about 60% of the damage to chemical machinery and equipment is mainly caused by corrosion, so when choosing the model of chemical process pumps, pay attention to the rationality of the material. There is generally a misconception that stainless steel is an "all-round material". No matter what the material and natural conditions are, stainless steel will be used. This is very dangerous. Chemical process pumps are widely used in all walks of life in the chemical manufacturing industry. They are important in chemical plants, metallurgical industries, pharmaceutical industries, chemical foils and other fields. Chemical process pumps also transport materials through centrifugal force. There are many types of process pumps. According to their basic scientific concepts, they can be divided into variable piston pumps, such as centrifugal water pumps, mixed flow pumps, mixed flow pumps, partial flow pumps, vortex pumps, etc.; positive displacement pumps, such as reciprocating pumps; rotary pumps; other types of pumps, such as jet pumps, magnetic drive pumps, water hammer pumps, etc. According to the production process or product characteristics, high-pressure methylamine pumps, cryogenic pumps, ammonium sulfate slurry pumps, etc. can be divided into dividends at the end of the year. In the production process of pharmaceutical factories or chemical machinery, pumps work under high temperature, low temperature or ultra-low temperature, high pressure, flammable, inflammable and explosive materials, and hazardous and highly corrosive chemicals. Some of them also work under high channel pressure, high head, high viscosity, small flow, and high cavitation conditions. The characteristics of stainless steel centrifugal pumps have very strict requirements, which should be corrosion resistance, no leakage and high wear resistance. In order to meet the special requirements of chemical enterprises, special pumps for chemical enterprises are also manufactured in the chemical machinery industry, such as plastic pumps, wire glass pumps, ceramic pumps, calcined petroleum coke pumps, magnetic drive pumps, fluoroplastic magnetic pumps, and sediment pumps. Daily maintenance of chemical process pumps : . - After the lifting and filling season is completed, the centrifugal pumps must be carefully cleaned and inspected. Parts that are found to be damaged or deformed and cannot be used normally must be repaired and replaced with new ones, and the lubricated parts should be filled with appropriate fuel; if the centrifugal pump is not used for a long time, it should be packaged and stored in a dry place. 2. For screws that are twisted daily, such as packing gland screws and water injection plugs, use appropriate wrenches and reasonable torque to disassemble them. Do not twist with pliers to prevent the thread or nut from loosening. For other screws, apply some grease from the top or wipe them with oil paper regularly for rust prevention. If the water-adding screws are not often used, they are easy to rust. Therefore, after buying a new centrifugal water pump, you must unscrew the water-adding plug, apply some motor oil and white oil on the thread, and then change the new oil two or three times a year. 3. For centrifugal water pumps lubricated with engine oil, the grease should be replaced once a month; for those lubricated with butter, change them once every six months. It should be noted that high-temperature resistant grease is used for centrifugal water pumps and sodium-based grease is used for motors. They should not be used incorrectly. Because sodium-based grease is hydrophilic, it will demulsify into foam and dissipate when it encounters water on the submersible pump, while high-temperature resistant grease is afraid of continuous high temperature. It is used on motors and is easy to melt when the temperature rises. Thank you for watching. If you need chemical process pumps or accessories, you can consult our company.

Long-axis pumps are suitable for conveying corrosive environmental media such as particles, high viscosity, strong acid, alkali, salt, strong oxidant, etc. on the conveyor belt of enterprises. The new submersible pump is suitable for conveying flammable and explosive light media. The shell, outlet pipe and current asset parts of the traditional submersible pump are all made of a kind of corrosion-resistant and material. The motor component is placed on the liquid surface, and the pump part is placed under the liquid surface. It has the characteristics of strong corrosion resistance, no blockage and high temperature resistance. The pump body, motor and flow parts of the new submersible pump are made of special materials. The motor is coaxially connected with the pump part and placed under the liquid surface. It is maintenance-free, has high explosion-proof performance, can be used in zero zone, and has low energy consumption. The long-axis pump belongs to a type of centrifugal pump. From the perspective of the centrifugal pump, the performance of the liquid pump can be effectively improved. The pump can be used for enterprises to transport rainwater, iron oxide water, sewage, corrosive chemical industrial production wastewater, seawater and other working liquids. It is widely used in industrial enterprises such as water supply companies, sewage treatment plants, steel mills, mines, as well as municipal water supply and drainage, farmland irrigation, flood control, waterlogging, etc. Long-axis pumps are mainly used to transport clean water, sewage containing certain solid particles (such as iron filings, sand, coal powder, etc.), corrosive industrial wastewater and seawater. They are widely used in primary water plants, sewage treatment plants, metallurgical and steel enterprises (especially mainly used to transport oxidized iron scale water in the cyclone pool of the industry), power plants, mines, municipal construction projects and farmland water conservancy system projects. The motor of the long-axis pump is coaxially connected to the pump. It consists of a pump body, a pump head, a connecting system pipeline and a control working device. The pump body includes a shielded motor and a centrifugal pump, and the motor and the centrifugal pump are coaxially connected. The external suction cover forms an inseparable whole. It adopts the explosion-proof technical standard EXDIIBT4 design, belongs to GA-level equipment [3], and is suitable for use in zero zone. The main advantages of the design are: the bearing of the pump is only a few hundred millimeters, there is no long shaft, and it will not cause students to swing and produce some problems. The operation is stable, the sound can be very small, and there is almost no wear. The pump and the medium contact parts are generally made of special materials and are widely used in chemical plants, pharmaceutical plants, factory production lines, generator sets and other places where flammable and explosive media are transported. The long-shaft pump is a vertical single-suction centrifugal pump. Its impeller is installed below the dynamic water level in the well. The power is mainly concentrated in the well. By raising the transmission long shaft to drive the impeller to rotate in the guide and casing, the water flows along the channel information between the guide casing and the impeller structure, and rises to the well surface through the water pipe. When the head is high, a centrifugal pump with multi-stage series impellers can be used. Due to the high manufacturing and installation precision, the efficiency decreases with the increase of the well depth, so it can only be used in deep wells below 100 meters.

Long-axis pumps are suitable for conveying various corrosive media such as particles, high viscosity, strong acid, alkali, salt, strong oxidant, etc. The new submersible pump is suitable for conveying various lightweight media such as flammable and explosive. The shell, outlet pipe and flow-through parts of the traditional submersible pump are all made of corrosion-resistant materials. The motor part is placed on the liquid surface and the pump part is placed below the liquid surface. It has the characteristics of strong corrosion resistance, no blockage, and high temperature resistance. The pump body, motor and flow-through parts of the new submersible pump are all made of special materials. The motor part and the pump part are coaxially connected as a whole and placed below the liquid surface. It has the characteristics of maintenance-free, high explosion-proof, zero-zone use, and low energy consumption. Basic structure and efficiency of long shaft pump The water sucked from the reservoir is sucked into the bell tube. As the blades of the centrifugal impeller in the centrifugal impeller chamber force the water to rotate, the water enters the guide vane body, the magnetohydrodynamic power generation makes the pump lift, flows through the pump barrel, and is discharged from the drain pipe elbow. The pump is connected to the connecting shaft according to the coupling (rigidity). The rolling bearing under the motor rubber support bears all the downward axial forces of the motor rotor. The connecting shaft is connected to the motor shaft through an elastic coupling. The centrifugal impeller (rim body) of the axial flow pump contains blades. Depending on whether the blades are adjustable or not, the axial flow pump is divided into the following three types: The centrifugal impeller (rim body) and blades of the mobile axial flow pump are of universal structure, and the blades cannot be adjusted; Adjust the blades of centrifugal impellers (rim bodies) and semi-leaf axial flow pumps. Only when the machine is turned off, remove the blades to adjust the blade placement angle (such as 0°, ±2°, ±4°, ±6°, ±8°), and the viewing angle is stepped. According to a set of adjustment mechanisms (mechanical equipment or hydraulic press), the full-leaf axial flow pump can be operated manually, electrically and computer-controlled to perform stepless adjustment of the blade placement angle. Installation method of long shaft pump: 1. Axial flow pumps (especially large and medium-sized pumps) have strict requirements on the form and specifications of the water inlet flow channel, which directly endangers the characteristics of the stainless steel plate deep well pump (such as high efficiency and cavitation characteristics), so a reliable design scheme (the design scheme of the Planning Institute) should be adopted. 2. Wet pit installation means that all or part of the pump is immersed in the potting liquid, and part of the pump is immersed in the suction tank; 3. Dry pit installation means that the pump is surrounded by gas, and a curved pipe suction channel is selected to enter the pump. Installation method: Generally, long-axis axial flow pump generator sets are installed on the same foundation layer. Location of drain outlet: Generally, the drain outlet is located above the foundation layer, but it can also be located on the foundation layer if the customer requires.

Long-shaft pumps are widely used in industrial and mining enterprises, power plants, cotton mills, water plants, petrochemical enterprises, urban water supply and farmland irrigation. If you need to install a long-shaft pump in one place, check whether the foundation can bear the full weight of the entire equipment, because only under this premise can it be guaranteed that the long-shaft pump will not deform the ground during long-term use. Next, workers need to check and clean all parts of the long-shaft pump. At this time, they can count the parts and related information according to the list given by the manufacturer, clean all , including the end faces, threads, etc., and check for scratches, bumps, etc. If this happens, they need to be carefully trimmed and coated with corresponding waterproof coatings. The working parts that have been assembled in the factory must not be disassembled again during the installation process, but during the inspection process, it is necessary to check whether the rotating part of the original can rotate smoothly and whether the axial measurement meets the installation requirements of the long-shaft pump. Then, the two ends of the rotating shaft can be supported with a V-shaped iron frame to check and measure the curvature of the rotating shaft. During the operation of the long-shaft pump, some mechanical failures often occur. So what should we do? 1. The motor bearing of the long-shaft pump is damaged. When the bearing is not lubricated or the oil is insufficient, there is oil leakage or there are impurities such as iron filings and sand in the oil, dry grinding will occur, the motor bearing will be worn, the resistance torque will increase, and the motor power will suddenly increase or the transmission belt will slip. In order to avoid this situation. In the event of an accident, pay attention to the cleanliness of the lubricating oil and strengthen the maintenance and repair of the motor. After the motor is damaged, the machine should be stopped to check, repair or replace the worn bearings. 2. The drive shaft of the long-shaft pump is broken. If the friction torque is large, the shaft will bend, the drive shaft will be ground, and the shaft will break. The current displayed decreases sharply, the power drops, and the water supply stops suddenly. At this time, the pump can be lifted to repair or replace the shaft. 3. The rubber bearing of the long-shaft pump is worn or falls off. The wear of the rubber bearing is mainly caused by the shaft not being straight, the gap between the shaft and the bearing is too large, and the bearing seat is skewed. The rubber falls off the bracket, mainly because the bearing and the bracket hole are not tightly matched, or the elastic retaining ring on the bearing seat fails. If such an accident occurs, stop the calibration of the standard shaft, repair the bracket, or replace the bearing. We should also know the maintenance of the long-shaft pump in daily life. The following long-axis pump manufacturer introduces the failure of long-axis pumps and the corresponding treatment measures. 1. The main engine of the long-axis pump is a water pump. When the water pump is running, it is inevitable that there will be failures and damage, resulting in the inability to pump water normally. So when it is found that the pump is not pumping well, it must be repaired and adjusted in time. Second, the long-axis pump does not absorb water or drain water. Most of the reasons are that the bottom valve is stuck, the filtered water part is blocked, the water suction height is too high or the water suction leaks. It may also be due to incorrect steering, impeller blockage and other reasons. After checking one by one, measures such as repairing the bottom valve, removing silt, correcting steering, and cleaning the impeller can be taken respectively. Third, when the pipeline leaks water or air, it may be that the mounting nut is not tightened. If the leakage is not serious, cement or cement slurry mixed with asphalt oil can be applied to the leaking or water leaking. Temporary repairs can be applied with some wet mud or soft soap. If the joint is leaking, tighten the nut with a wrench. If the leakage is serious, it needs to be disassembled again.

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