CN1068876A - A kind of high-pressure masked pump that adopts gas barrier - Google Patents

Abstract

A kind of high-pressure masked pump that adopts gas barrier, it is applicable to high pressure, the liquid conveying machinery of middle or small discharge capacity.This device has centrifugal pump, shield electric machine, it is characterized in that; Shielding motor rotor is a rare-earth permanent magnet rotor, and pressurization-gas cascade, control valve, liquid storage chamber and liquid level sensor are arranged.When work, measure the height that infiltrates liquid level in the liquid storage chamber by liquid level sensor, the break-make of control control valve.The fluid pressure that the using gases balance is infiltrated by centrifugal pump input bearing place is operated in the gaseous environment shielding motor rotor.Frictional force is little, and the efficient height is adapted to high rotating speed, thereby feasible to higher delivery pressure.

Description

A kind of high-pressure masked pump that adopts gas barrier

A kind of high-pressure masked pump that adopts gas barrier, it belongs to liquid conveying machinery, is applicable to high pressure, the oil of middle or small discharge capacity, chemical industry, food processing, papermaking and mining etc.

Present high-pressure service pump can use gear pump, reciprocating pump etc.But these pump deliveries are very little, for obtaining the high-pressure service pump of a fixed displacement, adopt high speed centrifugal pump more.Using high speed centrifugal pump can obtain higher delivery pressure and very wide discharge capacity scope, and just can adjust operating mode easily as long as regulate the rotating speed of centrifugal pump, is a kind of desirable variable working condition pump.But when using centrifugal pump, because centrifugal pump running shaft input end will bear bigger fluid pressure, sealing problem is difficult to resolve determines.Present solution is to use the closed shield motor to do power, drives centrifugal pump work.The closed shield motor adopts and add one deck radome between rotor and stator, and rotating part and standing part are separated, and centrifugal pump body is connected sealing with motor field frame, thereby solves centrifugal pump input shaft end bearing seal problem.The use shielded motor drives, and rotor is immersed in to be transferred in the liquid and rotates.When low speed, the liquid viscous resistance is little, and this method can also be carried out, along with the increase of relative velocity, viscous resistance and speed square in addition cube be directly proportional, at this moment viscous resistance will consume most of energy of input, this is not only efficiency, and is difficult to improve the rotating speed of pump.

The high-pressure masked pump that the shielded motor that the objective of the invention is to invent a kind of high speed centrifugal pump and adapt is with it formed, it turns round motor rotor in gaseous environment, and resistance is little, the efficient height.

The present invention as shown in Figure 1.It has the pump housing 1, centrifugal blade wheel 2, live axle 3, driving shaft bearing 4, motor pressure-bearing shell 5, stator 6, radome 7, rotor 8, rotor bearing 9, it is characterized in that: pressurization-gas cascade 10, control valve 11 are arranged, in the lower end of rotor 8 liquid blocking disk 12 is arranged, between liquid blocking disk 12 bottoms and the pump housing 1, liquid storage chamber 13 is arranged, liquid level sensor 14 is equipped with at 13 places in the liquid storage chamber, and rotor 8 is the rare earth material p-m rotor.

In the present invention, centrifugal pump structure is the same with Ordinary Centrifugal Pumps, motor pressure-bearing shell 5 is connected sealing with the pump housing 1, and pump input shaft and motor output shaft and connection part are included in the sealing position, and the liquid that leaks out by driving shaft bearing 4 from pump can only enter into liquid storage chamber 13.Radome 7 is the same with common shielded motor, wraps in stator 6 inner chambers and the pressure-bearing shell 5 with nonmagnetic substance (as aluminium, copper, stainless copper or plastics etc.), to guarantee tightness, stator coil and the conveying liquid that may occur is separated.On radome 7 tops, there is an aperture to link to each other by control valve 11 with pressurization-gas cascade 10.In liquid storage chamber 13, liquid level sensor 14 is housed.In rotor 8 bottoms a liquid blocking disk 12 is housed, between the radome 7 of it and stator 6 lower ends or the special bulge loop certain clearance is being arranged axially, certain overlap distance is radially being arranged.

The present invention along with increasing of centrifugal pump leaf delivery pressure, is transferred liquid and infiltrates motor from the bearing slit of pump and motor joint when work, at first enters liquid storage chamber 13.Liquid level sensor 14 is measured the liquid measure value of infiltrating, when the liquid measure value of infiltrating reaches a certain amount of, and sensor 14 actions, control valve 11 conductings, pressurized gas enter in the radome 7 by radome 7 top apertures, give internal pressurization.Institute's plus-pressure is slightly larger than following liquid and infiltrates pressure, pushes back in the pump housing infiltrating liquid.When the liquid level that infiltrates in liquid storage chamber 13 dropped to certain value, liquid level sensor 14 moved once more, and closing control valve 11 enters in the pump output channel to prevent pressurization gas, saved the control gaseous amount.The effect of liquid blocking disk 12 is to prevent because motor output shaft etc. rotates splashing of causing at a high speed and liquid is got rid of between rotor and the radome among the present invention.After proper functioning, gas pressure basic with infiltrate fluid pressure and keep balance, only big fluctuation takes place or because the conducting of pressure decline just can the causing control valve 11 that gas leakage causes, thereby gas consumption is little at extraneous delivery pressure.

The present invention adds the pressurized gas balance portion on the basis of original shield electric machine and centrifugal pump body.In when work, use pressurized gas and infiltrate the liquid pressure balance, keep that no liquid exists between rotor and stator, solved that common shielding motor rotor is worked and the resistance that brings increases problem in carrying liquid.Resistance was little when the present invention worked, the operational efficiency height.

The present invention uses rare earth material to do the p-m rotor of motor, constitutes an autosynchronous motor with stator.Use variable-frequency power sources to drive, can adjust the rotating speed of motor by the frequency of adjusting variable-frequency power sources, for example the patent No. is the patent of CN89215333.Also can constitute and use Hall element for there not being the electric motor with random coaxial reversing that machinery contacts the Detecting element of synchronous communicating controller, for example the patent No. is the patent of CN89215098.The same with common DC motor, can control the machine operation operating mode by input voltage.Also can control it, use the p-m rotor of rare earth material with numerical control method.Can bigger starting torque be arranged than induction motor, make simply, and can obtain higher rotating speed.

Liquid level sensor 14 of the present invention can be a differential pressure pickup, measures the pressure difference in 13 tops, liquid storage chamber and bottom.By the pressure extent, can reflect the height of liquid level, when using differential pressure pickup, also can be measure liquid storage chamber 13 upper pressure and centrifugal pump delivery outlet pressure poor.By the pressure reduction in order to control control valve 11 only logical boundaries is set, control valve 11 is controlled.Liquid level sensor 14 also can be a float sensor, and the height by float comes the perception liquid level, is used for control valve 11 is controlled.Liquid level sensor 14 can also be to use two immersion liquid switches, is contained in the upper-lower position place of the controlled liquid level in liquid storage chamber respectively.After the immersion liquid of last immersion liquid switch, connect control valve 11, make it conducting, instantly during immersion liquid switch aneroid, closing control valve 11.

Pressurization-gas cascade 10 can be a compressed gas cylinder, can be interchangeable, and aeration also can be arranged, and by other source of the gas it is inflated.Gases used can be normal air.For fire-proof and explosion-proof, also can use nitrogen or carbon dioxide etc.The flow of control valve 11 need not be big, uses common check valve to get final product.

Claims (1)

1, a kind of high-pressure masked pump that adopts gas barrier, it has the pump housing 1, centrifugal blade wheel 2, live axle 3, driving shaft bearing 4, motor pressure-bearing shell 5, stator 6, radome 7, rotor 8, rotor bearing 9, it is characterized in that: pressurization-gas cascade 10, control valve 11 are arranged, in the lower end of rotor 8 liquid blocking disk 12 is arranged, between liquid blocking disk 12 bottoms and the pump housing 1, liquid storage chamber 13 is arranged, liquid level sensor 14 is equipped with at 13 places in the liquid storage chamber, and rotor 8 is the rare earth material p-m rotor.

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