The whole process of installation of submersible sewage pump auto-coupling equipment
The submersible sewage pump integrates a pump and an electric mechanism. Its machinery and equipment are similar to other types of centrifugal water pump machinery and equipment. The general approach is: first carry out the foundation construction of the centrifugal water pump, and wait until the foundation of the centrifugal water pump generator set reaches the standard. Carry out the installation of pump casings and water outlets, accessories and equipment.
The submersible sewage pump is generally set in the sump (pit), and the machinery and equipment are divided into mobile machinery and portable machinery and equipment. Portable machinery and equipment are very simple. They are commonly used in small water pump machinery and equipment. Plastic hoses are generally used for the water outlet. Mobile machinery and equipment are rather chaotic. This type of machinery and equipment is generally used for large-scale submersible sewage pumps containing fully automatic coupling machinery and equipment. The sequence of machinery and equipment is: pouring concrete foundation, guide rod and pump seat, pump casing, water outlet and accessories.
Installation of submersible sewage pump: Lift the pump casing, and place the coupling equipment (coupling equipment, submersible sewage pump and electric motor are generally made into a complete set of machinery and equipment) in the guide rod, so that the pump casing is slowly reduced along the guide rod until the coupling The combined machinery and equipment are connected with the outlet elbow on the pump base, and the outlet axis of the centrifugal water pump overlaps with the inlet axis of the outlet elbow.
Installation of water outlet and accessories: The outlet of the centrifugal water pump and the outlet elbow are connected by flanges, and other accessories on the water outlet, including stop valves, compensators and check valves, are connected by flanges.
When the pump casing is being overhauled, people do not need to enter the sump (pit). Manual services or mechanical equipment can be used to clearly raise the pump casing from the sump (pit) pipe with an iron chain connected to the pump casing. The lifting support frame can be used as a long-term support frame or a temporary support frame. The lifting support frame is provided with an electric type, hand chain hoist or movable pulley, which is connected with the lifting iron chain.
Screw Impeller Pump
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What are the hydraulic losses of centrifugal pumps?
The hydraulic loss of the centrifugal pump has impact loss, vortex loss and friction loss along the path.
First, the impact loss
Each pump has its own design flow. When the consumption is under the design flow condition, the flow at the inlet enters the impeller along the blade, so no impact with the blade occurs, and the outlet flow does not occur. The impact of the pump casing is then more efficient. However, when the flow rate deviates from the design condition, the direction of the liquid flow deviates from the direction of the blade, causing an impact.
Second, the vortex loss
In the water pump, the flow cross section is a very complicated spatial section. When the liquid passes here, the flow rate is too small and the direction is constantly changed, so that vortex loss is inevitably generated. In addition, when the overcurrent surface has sharp corners, burrs, and dead water, the vortex loss is also increased.
Third, the friction loss along the way
Due to the roughness of the over-flow surface of the pump and the viscosity of the liquid, the frictional resistance loss occurs when the liquid swims. The size of the loss is expressed by the following formula;
Hm=AQ2 where A is the coefficient.
Painted on the coordinates, it is a parabola with the origin as its apex.
In the hydraulic loss of each part, the hydraulic loss in the impeller is the largest, accounting for about half of the total black and white loss; secondly, the hydraulic loss at the turn of the vane, accounting for about 1/4 of the total hydraulic loss, and the remaining 1/ 4 Hydraulic loss, loss in the impeller to the guide vane, the guide vane diffusion part, the anti-guide vane to the impeller inlet and other parts.
In order to reduce the hydraulic loss of the pump, the cross-section of the flow should be changed gently and the speed should be reasonable. And choose the appropriate impeller, vane type and entrance and exit placement angle. In addition, the surface finish of the overcurrent components should be increased.
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How to store and transport deep well submersible pumps?
Nanjing Forever Sewage Treatment Equipments Co., LTD. is a professional submersible pump manufacturer. In the selection of customer submersible pumps, our company’s pump manufacturers will provide pre-sales services such as submersible pump models and submersible pump prices for customers’ reference, and my pump manufacturers can provide customers with customized pump products. This product information is about how deep well submersible pumps are stored and transported:
1. Storage of deep well submersible pumps
1. The deep well submersible pump should be stored in a dedicated warehouse for dry work. It is strictly forbidden to be placed outdoors for a long time. Always protect the threads at both ends of the thread during transportation and storage to prevent foreign matter from entering the pump.
2. To establish a deep well submersible pump file, record the service process, maintenance record, inspection certificate and tracking card of the deep well submersible pump.
3. For the well pump with the packing box, it should be placed on the flat concrete floor; for the deep well submersible pump without the packing box, it should be discharged on the pump frame with 3 fulcrums. The two ends are not more than 1m.
4. It is necessary to store the spare deep well submersible pump for a long time. It should be coated with No. 20 oil to prevent corrosion.
Second, the transportation of deep well submersible pumps
1. When transporting the deep well submersible pump, the deep well submersible pump should be used to fix the pump on the pump frame. When there is no special vehicle, the length of the slot should be no less than the pump length. Pulled by truck. It must be leveled with the support, and the length of the pump end should not exceed 1.5m. At the same time, the deep well submersible pump must be fixed to the tank to prevent bumps and foreign objects from colliding and damaging.
2. The wire must be worn at both ends during the transportation process. Prevent the plunger from escaping and foreign matter from entering the pump.
3. When handling short-distance manpower, it should be no less than 3 people and evenly distributed along the whole length.
4. Lifting should be carried out according to the lifting position designed on the package. When lifting a single pump, use a crossbar that is half the length of the pump.
Thank you very much for visiting and reading the above! This article is about how to store and transport deep well submersible pumps. If you want to know more about this issue, or want to buy this related product, please contact our customer service staff directly. Our company also produces self-priming pump, at any time. Welcome your inquiry.
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Stainless steel self-priming pump routine maintenance knowledge
The stainless steel self-priming pump is a common pump valve with simple and reliable structure and durability. However, quality products and equipment also require regular maintenance. This not only avoids some accidents, but also greatly increases the service life of pump and valve products. Under normal conditions of the pump, it is generally not necessary to open the maintenance frequently. General maintenance of the pump should pay attention to several main parts:
1. Rolling bearing: When the bearing wears to a certain extent after long-term operation, it must be replaced.
2. Front seal ring and rear seal ring: When the seal ring wears to a certain extent, it must be replaced.
3, mechanical seal: mechanical seal in the case of no leakage, generally should not be opened for inspection. If a serious leak occurs at the lower end of the bearing body, the mechanical seal should be disassembled. When assembling and disassembling the mechanical seal, it must be taken lightly, pay attention to the cleaning of the mating surface, protect the mirror surface of the static ring and the moving ring, and it is strictly forbidden to strike. The reason for the leakage due to the mechanical seal is mainly due to the friction of the mirror surface. The repair method: the end surface of the friction pair can be ground to restore the mirror surface. Another cause of mechanical seal leakage is the improper installation of the O-ring or the aging of the O-ring. At this point, the O-ring needs to be replaced for reassembly.
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Working principle of submersible sewage pump
The submersible sewage pump does not need to build a pump house, and it can work without directly diving into the water. The working principle of the submersible sewage pump and the submersible sewage pump are similar to those of the pump. The submersible sewage pump is mainly composed of an impeller, a pump body and a submersible motor. The water pump and the motor are on the same shaft. The water pump is located at the lowermost end of the submersible sewage pump, which can maximize the suction of the surface sewage. Because the submersible sewage pump has compact structure, small floor space, convenient installation and maintenance, long running time, no cavitation damage and irrigation water, the submersible sewage pump is widely used in cement plants, power plants, coal processing industries, Steel mills, petroleum, chemical and municipal wastewater treatment.
The submersible sewage pump adopts a unique single-blade impeller structure or a double-bladed impeller structure, which greatly improves the dirt passing ability. Some submersible sewage pumps also have a function of mixing or shredding, which can pass the pump diameter of 5 times the fiber material and the diameter of the pump. A solid particle of about 50% caliber. The submersible sewage pump is mechanically sealed with a new type of hard and corrosion-resistant tungsten carbide material, which can be placed in the oil chamber for a long time. The submersible sewage pump has two different installation methods, a fixed automatic coupling installation system and a mobile free installation system.
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Maintenance of submersible pump motors and maintenance of related valves, pipes and accessories
The visual inspection should be neat and tidy, the nameplate is intact, and the grounding wire is well connected.
Disassemble the wire connecting piece in the motor terminal box, and test the insulation resistance value of the phase and phase of the motor winding and the ground between the ground and the ground with a 500V megohmmeter to be not less than 0.5 megohm.
The three-phase wires and connecting pieces in the motor terminal box should be tight and tight.
Maintenance of valves, pipes and accessories related to Forever submersible pumps:
The switches of each valve should be flexible and reliable, with no leakage inside or outside.
The check valve should be flexible and there is no water leakage inside and outside the valve.
The pressure gauge is accurate and the dial is clear.
The appearance of the pipes and accessories is neat and beautiful, without cracks, and the paint should be intact without falling off.
Jog to determine if the pump steering is correct, if it is wrong, it should be corrected.
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What are the application conditions of large flow submersible pumps?
Pumping medium: similar to clean water, liquid with a solid content of not more than 0.02%
Medium temperature: 40°C for ordinary pump and 120°C for hot water pump
Media PH value: 3 to 10
Power requirements: frequency is 50Hz, 60Hz (can be customized), rated voltage 380V [660V, 1140V, 3000V, 10KV] ± 5%
Technical parameters
Flow range: 5 to 650 cubic meters / hour
Lift range: 2 to 1500 meters
Power range: 3 to 410kW (secondary speed motor, customizable four or six motor)
Speed: 2900 rpm (secondary speed motor)
Optional material: HT200, 304, 316, 316L, tin bronze large flow submersible pump
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Several methods for controlling the flow of submersible pumps
For the use of submersible pumps, we are mainly drainage, then I believe that many of the control of the water output and water flow are not understood, and then explain the various adjustment methods of the water flow control of the submersible pump.
1. Variable speed adjustment. Changing the speed of the submersible pump can change the performance of the pump, thus changing the operating point of the pump. This method is called variable speed mediation.
2. Reducer adjustment. After the impeller is turned, the performance of the pump will change according to a certain law, so that the operating point of the pump changes. The method by which the turning impeller changes the operating point of the pump is called the variable diameter adjustment.
3. Variable angle adjustment. Changing the installation angle of the blade can change the performance of the pump to achieve the purpose of changing the operating point of the submersible pump. This way of changing the operating point is called the variable angle adjustment of the pump.
4. Throttling adjustment. For the water pump device in which the gate valve is installed in the outlet pipe, when the gate valve is closed for a small time and the local resistance is increased in the pipeline, the pipeline characteristic curve becomes steep, and the operating point moves to the upper left along the Q-H curve of the water pump. The smaller the gate valve is closed, the greater the increased resistance and the smaller the flow. This method of changing the operating point of the pump by closing the small gate valve is called throttle regulation or variable valve regulation.
When the small gate valve is closed, the local head loss of the pipeline increases, the pipeline system characteristic curve moves to the upper left, and the pump operating point also moves to the upper left. The smaller the gate valve is closed, the greater the local head loss and the smaller the flow rate. It can be seen that the throttling adjustment not only increases the local head loss, but also reduces the amount of water, which is uneconomical. However, due to its simplicity and ease of use, it is widely used in small water pump devices and pump performance tests.
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Supply and demand of pump market
Pumps are general-purpose mechanical products. China’s pump products have approximately 450 series and more than 5,000 specifications. They are widely used in agriculture and water conservancy, construction industry, petroleum industry, power industry, shipbuilding industry, mining, metallurgical industry and environmental protection industries. . In recent years, with the rapid growth of the domestic economy, the market’s demand for pump products has also grown rapidly. According to statistics from the Industrial Pump Research Institute of Zhejiang University of Technology, the sales revenue of the pump industry in China exceeded RMB 100 billion in 2009, and the industrial output value of the industry was around RMB 108 billion, with a balance between production and sales. The regional industrial output value of the industry is: 26 billion yuan in Wenling, Taizhou, 10 billion yuan in Wenzhou Yongjia, 5 billion in Hangzhou, 15 billion in Shanghai, 6 billion in Shandong, 8 billion in Shenyang, and Dalian 6 billion yuan, 5 billion yuan in Guangzhou, 3 billion yuan in Beijing Tianjin, 2.5 billion yuan in Shijiazhuang, and Changsha 25 In recent years, the pump industry has maintained a momentum of rapid growth. In 2007, the growth rate was 23.20%, but due to global finance Affected by the economic crisis, the growth rate of the industry in 2008 has dropped slightly, to 13.5%. With the rapid development of the pump industry and the fierce market competition, the growth rate of the pump industry will tend to be stable, and it is expected that the future.
The five-year industry development rate is between 13% and 17%. The industry’s development focus will shift from quantitative growth to quality improvement.
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