The pump is a kind of general-purpose machine with a wide range of applications and it is widely used. It can be said that in all areas of the national economy, there is a pump at work where there is liquid flow, especially in chemical industry, petroleum, energy, power, light industry, food, etc. In environmental protection and other industries, it has always been a subject of major research. 111. The authors through the on-site inspection of related manufacturing plants and use plants, as well as joint discussions and analysis with plant oil plant engineers, found that there are many problems in the use of vegetable oil pumps, resulting in The pump is not reliable and has a short life. Summarized mainly in: 1) the use of 1H pump collection date: G00fr05 theory and application.
* Communication contact shaft seal design is unreasonable, operational reliability is poor, easy to leak, resulting in poor treatment of oil pollution, and flammable lead to unsafe;) The magnetic pump used is complex in structure, expensive, and prone to stuck, degaussing phenomenon; 3 ) The material and the processing technology of the pump's flow-through parts do not meet the corresponding hygiene standards.
In order to solve the problems in the transportation process of high-temperature vegetable oil refined by vegetable oil plant, the new pump is designed and developed. The main performance parameters are: the finished vegetable oil without solid particles in the range of flow Q 280*C and other similar liquids.
2.1.1 Isolation sleeve design Isolation sleeve is directly connected to the magnetic rotor in the magnetic pump. It is directly connected to the magnetic rotor. The wheel also rotates and rotates inside. It is an important part. It is located between the rotating inner and outer magnetic steel body. The transmission principle of the non-rotary magnetic pump of the internal Qin 1 axis is designed for the use of the pump of the vegetable oil plant, and the new structure of the shaft non-rotary magnetic drive pump is adopted, as shown.
Shaft non-rotating vegetable oil pump Magnetically driven centrifugal pump is a new type of structural pump designed by using the combination of magnetic drive and sealing. The fundamental difference between magnetic transmission and various mechanical transmissions is that when it transmits energy to the driven parts, the driven shaft does not need to protrude from the housing, but uses a magnetic field to transfer energy through the air gap and thin walls of the isolation sleeve and drives the inner magnetic rotor to rotate. . In this way, the leakage path of the shaft seal is fundamentally eliminated and the pump is completely sealed.
The development of magnetic pumps is linked to the development of permanent magnet materials. The fastest development abroad is in Germany and Japan. The development and use of magnetic pumps in China is still in the initial stage. In recent years, the matching power of magnetic pumps designed and manufactured has been very small, especially in terms of variety and quantity, and there is still a big gap with foreign countries, especially in terms of design methods to be further improved. The design of the magnetic pump is also the use of magnetic induction principle to transmit torque 4, as shown, it is mainly from the pump head (impeller, pump body), external magnetic steel (active rotor), inner magnet (slave rotor), isolation sleeve, shaft , bearings, indirect seats and other components. The pump body and the center seat define the rotor chamber by means of bolt connections and a stop. The outer magnetic rotor is connected with the motor shaft through a key, and the isolation sleeve is clamped between the pump body and the middle indirect seat through the bolt connection and the stop port positioning. The gap between the spacer and the inner and outer magnet bodies is very small. The shaft is supported by the hub at the inlet of the pump body and the hub on the isolation sleeve. The impeller and the inner magnetic steel body are sleeved on the shaft through the sliding bearing. The thrust bearing is designed at the rear end surface of the inner magnetic steel body and the front cover plate of the impeller so that the rotor can be positioned axially. The prime mover drives the outer magnetic steel to rotate, and the magnetic line of the outer magnetic steel penetrates the isolation sleeve. The non-magnetic material and the inner magnetic steel attract and form a magnetic circuit to drive the inner magnetic steel to rotate synchronously. Because the front surface of the inner magnet body and the impeller rear cover wheel hub send liquid. The pumped liquid is enclosed in a spacer without the problem of the shaft seal of a typical pump, so the pump is a leak-free pump.
The shaft of the rotary machine is almost always rotating. However, in the case of the small-sized magnetic drive pump, there are many advantages in using the shaft-non-rotating type of the design: First, since the shaft only supports and fixes the shaft, it does not transmit the torque and selects the shaft material. And the processing technology provides convenience, such as the shaft can use ceramics and other brittle materials; Second, do not need rear pump cover and impeller nut and other parts, simpler and more compact than the general axis rotary magnetic pump structure; again, the front end of the inner magnetic steel body The surface is directly connected with the rear cover wheel hub of the impeller, which reduces the disc friction loss of the two end surfaces of the impeller rear cover and the front surface of the inner magnet body. Especially for low specific speed high lift pumps, disc friction losses account for a large proportion of the total pump losses.
2 Pump Design 2.1 Magnetic Drive Design As shown, the magnetic drive is composed of a spacer sleeve, an inner magnetic rotor, an outer magnetic rotor, etc. It is a key component of a magnetically driven centrifugal pump. The design of the magnetic driver is to determine the magnetic performance structural parameters according to the hydraulic performance parameters to be satisfied by the pump, that is, the magnetic transmission torque Tc is greater than the required torque Tz of the shaft, mainly the selection of hydraulic dimensions D, bi, Pi, D2, fc, fe And optimization. The specific rotation speed of the designed pump is very low, so the inlet side is parallel to the axis line, and the diameter D1 of the inlet side of the blade is appropriately enlarged, which can reduce the flow rate and improve the anti-cavitation performance of the pump. The impeller outer diameter D2 has a great influence on the pump performance curve. The outer diameter increases and the lift increases. However, if the impeller outer diameter is too large, the wheel resistance loss will increase. On the premise of guaranteeing the design flow, the width b1 of the inlet side of the blade and the width of the outlet side should be determined and appropriately increased by b1 and b2. Increasing b1 can make the relative velocity of the inlet of the impeller small, thereby improving the cavitation performance of the pump. Designed to meet the special requirements of high-temperature finished vegetable oil in vegetable oil plants, requiring small flow, high lift, high temperature, high cleanliness, no seepage, high reliability and other special requirements, a new single-stage single-suction magnetic drive pump was designed and researched. The pump body is an axially inhaled, radially discharged squeezing neck, and the rear door is open, and the pump body is subjected to good forces. The impeller is closed and the delivery of clean liquid is efficient.
Between the isolation sleeve and the middle seat and the pump body, the positioning of the spigot and the bolt are connected, so that the coaxiality is high. The impeller and the inner magnetic rotor are enclosed between the spacer sleeve and the pump body and are immersed in the transmission medium so as to achieve full sealing and no leakage. Therefore, it is especially suitable for the transportation of flammable, explosive, highly toxic and corrosive media and in places where sealing is very demanding, such as aviation, aerospace, food, medicine and other industries. Therefore, the pump is a new type of pump with great research value and development prospects.
CNC Lathe With Linear Guideway Flat Bed
Cnc Wood Lathe,Flatbed Cnc Lathe,Cnc Automatic Lathe,Linear Guideway Cnc Lathe
Ningbo junfa CNC Equipment Co. Ltd. , https://www.nbintimecnc.com