The first section selection principle
Pump is a wide range of general-purpose machinery and equipment, widely used in petroleum, chemical, power metallurgy, mining, ship selection, light industry, agriculture, civil and defense departments, occupy an important position in the national economy. According to 79 statistics, China's pump production reached 1.256 million units. The electricity consumption of the pump accounts for more than 21% of the national electricity consumption. Therefore, reducing the pump energy consumption, the use of energy conservation is of great significance.
In recent years, we have designed and manufactured many energy-efficient products in the pump industry, such as IHF, CQB, FSB, UHB and other pump products, which have played a positive role in reducing the pump energy consumption. However, at present, in all fields of the national economy, due to the irrational selection, many pumps are in an unreasonable operating condition, and their operation efficiency is low, thus wasting a lot of energy. Some pump because the selection is not reasonable, can not be used, or the use of maintenance costs increase, low economic benefits. Thus it can be seen that the rational selection of pumps is equally important for energy conservation.
The so-called rational election pump, is to take into account the pump unit and pumping station investment and operating costs and other comprehensive technical and economic indicators, to make it in line with economic, security and applicable principles. Specifically, there are the following aspects:
1, must meet the flow and lift requirements, requiring the pump operating point (the intersection of device characteristic curve and the pump performance curve) often remain in the high-efficiency range of operation, so that both the power and not easy to damage the mechanical parts.
2, the selected pump should not only small size, light weight, low cost, but also have good characteristics and high efficiency.
3, with good anti-cavitation performance, this will not only reduce the depth of the excavation of the pump room, but also to pump cavitation, smooth operation, long life.
4, according to the selected pump built pumping station, less project investment, low operating costs.
The second section selection steps
First, list the basic data:
1, the characteristics of the media: media name, specific gravity, viscosity, corrosive, toxic and so on.
2, contained in the media due to the body particle diameter, content how much.
3, medium temperature: (℃)
4, the required flow
General industrial pumps in the process can ignore the leakage in the pipeline system, but must consider the impact of process changes on the flow. Agricultural pumps if the use of open channel water, but also must consider the leakage and evaporation.
5, pressure: suction tank pressure, drainage tank pressure, pressure drop in the piping system (head loss).
6, the piping system data (diameter, length, type and number of pipe fittings, water tank to the pressure tank geometric elevation, etc.). The device characteristics should also be made if necessary.
In the design and layout of the pipeline, we should note the following:
A, a reasonable choice of pipe diameter, pipe diameter, the same flow, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will result in a sharp increase in resistance loss, so that the selected pump lift, with With increased power, cost and operating costs have increased. Therefore, it should be considered technically and economically.
B, discharge pipe and its fittings should consider the maximum pressure that can bear.
C, pipe layout should be arranged as straight pipe, pipe fittings to minimize and minimize the length of the pipeline, you must turn when bending the elbow bend radius should be 3 to 5 times the pipe diameter, the angle is greater than 90 ℃.
D, the discharge side of the pump must be installed valves (ball valve or globe valve, etc.) and check valve. The valve is used to adjust the operating conditions of the pump. The check valve prevents the pump from reversing when the fluid is flowing backwards and prevents the pump from hitting the water hammer. (When the fluid backwards, will have a huge reverse pressure to pump damage)
Second, determine the flow head
1, determine the flow
a, if the production process has been given the smallest, normal, maximum flow, should be considered the maximum flow.
b, if the production process is only given normal flow, should consider leaving a certain margin.
For the large flow rate of ns> 100, it has an unexpected lift pump, and the flow margin is 5%. For the low flow rate of ns <50 and the pump, the flow margin is 10%, the pump of 50≤ns≤100, the flow margin Take 5%, poor quality and poor operating conditions of the pump, flow margin should be taken 10%.
c, if the basic data only to the weight flow, should be converted into volume flow.
Product Description:
Electric Linear Actuator For Medical Bed
Hospitals across the world face a reality in which there are fewer staff to attend to an increasing number of patients. Those currently in need include the elderly, obese, and patients with multiple diagnoses. Both trends call for improved applications able to help improve comfort for patients, ergonomics for staff and efficiency levels for hospitals. Using Electric Medical Bed actuator systems to provide movement and intelligent features in hospital beds will allow manufacturers to meet demands and have several advantages in a fierce market.
Hospital Bed Motor Actuator Parts has been revolutionized by customizable technologies, notably electric linear actuators. From lift chair and patient hoist actuators to hospital bed actuators, Xinyi Bed Actuator has provided manufacturers with medically certified linear motion products which have been designed specifically for the healthcare industry. These products are used to make healthcare and home settings safer and more efficient than ever.
Technical data:
Input voltage:12VDC/24VDC/36VDC
Max.load:Thrust 6000N,Pull 4000N
Speed: (5mm/s 6000N) (10mm/s 3000N) (20mm/s 2000N) (40mm/s 800N)
Duty cycle:10%,stop for 18 mins after continuoulsy working 2 mins
Ip grade:IP 54
Limit switch:Built-in limit switch,non-adjustable
Operation temperature:+5℃~40℃
Min.install dimension:285mm(175+stroke) [From center of Mounting Holes]
Max.stroke:450mm
Tail connector:90º rotation available
Memory function:optional
Colour:Black/Grey
Linear Actuators For Medical Care
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ZHEJIANG XINYI INTELLIGENT DRIVE TECHNOLOGY CO.,LTD , https://www.xinyiactuators.com