CN208858580U - A kind of centrifugal water pump - Google Patents

Abstract

The utility model discloses a kind of centrifugal water pump, pump case is divided into two sections of connected front and back, and leading portion is pump spiral case, and back segment is segment pump case；The eccentric rotor of fixed blade is provided in pump spiral case；The tangent line impeller of semi-open type is installed in the pump case of segment, the blade of semi-open type tangent line impeller is to rotation center in radial pattern structure.The centrifugal water pump, it is provided with plunger pump low discharge, high pressure, outside high suction capacity, overcome the shortcomings that existing centrifugal pump is as high pressure cleaning pump, the drawbacks of also fundamentally solving plunger pump in operation, make the structure of equipment simpler, operation is more stable, and can effectively save Energy in use, the stability for improving efficiency and applying, so as to be suitable for high-pressure cleaning device well.

Description

A kind of centrifugal water pump

Technical field

The utility model relates to water pump structure, especially a kind of structure of centrifugal water pump.

Background technique

High-pressure wash is one of economical, the cleaning mode of environmental protection.Existing high-pressure cleaning device is usually filled by power Setting makes high-pressure plunger pump generate high pressure water, and dirt, rusty stain etc. are removed, washed away, to reach cleaning table by jet stream to body surface The effect in face.Such cleaning way is widely used in each field such as coal, mine, metallurgy, railway, ship.

Existing high-pressure cleaning device, due to centrifugal water pump characteristics condition, in the case where guaranteeing flow, pressure Extremely unstable, the hurried decline of multistage high-pressure centrifugal pressure when flow demand is big, cleaning effect is poor, so cleaning equipment Main select all is plunger pump, and to meet the performance curve and pressure requirements that cleaning needs, but plunger pump is due to the technology of itself Feature, and have the disadvantage that.

1, plunger pump is moved back and forth in cylinder body by plunger, so that the volume of seal operation cavity is changed realize by The liquid of unit volume pressurizes, to meet the requirement of cleaning.Due to cleaning pump not instead of enclosed, an open system System；Its requirement to flow is relatively high, and in order to meet this requirement, the volume needs of plunger pump are made especially big, and cost can compare It is higher.

2, plunger pump is directly entered plunger case due to liquid, so the requirement to medium is relatively high, such as the presence in medium Impurity can pull casing wall, and the efficiency decline of less serious case's plunger pump, the locking of severe one plunger pump or damage are scrapped.

3, plunger pump is a typical positive displacement pump, and the pressure of positive displacement pump and load are unidirectional additive processes, that is, is being loaded Pressure process is bigger, loads bigger.When closing valve builds the pressure, pressure can constantly rise, and when being more than setting value, safety valve is opened Pressure release will cause the serious waste of driving energy consumption.

And existing centrifugal pump includes saving disconnected formula centrifugal multistage pump multiple centrifugal pump, although high pressure (Gao Yangcheng) can be obtained, due to centrifugation The master curve of pump, such as Fig. 1, the pressure curve of water pump is a sensitivity curve, when bleeding off pressure, that is, when starting valve opening cleaning, by The pressure for increasing, the very fast decline of pressure in flow moment, and being discharged will obtain always by sacrificing flow, so not being able to satisfy clear Wash the demand of pump.

Utility model content

The utility model is directed to a kind of stability of flow, and energy-saving and environment-friendly centrifugal water pump not high to medium requirements.

Centrifugal water pump described in the utility model, including pump case and being installed by bearing are rotatably pumped with pump case both ends One end of axis, pump shaft is stretched out on the outside of pump case, the connecting component of installation connection power input device in section of stretching out；Pump case is divided into connected Two sections of front and back, leading portion be pump spiral case, back segment be segment pump case；The eccentric rotor of fixed blade is provided in pump spiral case； The tangent line impeller of semi-open type is installed in the pump case of segment, the blade of semi-open type tangent line impeller is to rotation center in radial pattern knot Structure.

Centrifugal water pump described in the utility model, the pump spiral case of pump case leading portion are provided with the bias with fixed blade and turn Son can make water form the pendular ring concentric with stator by water throwing to stator wall, pendular ring constituted together with rotor blade variable volume from And vacuum chamber is formed, make pump that there is suction capacity, after air or cavitation gas drain, impeller is beaten by Ordinary Centrifugal Pumps impeller Water, by guide vane wheel by guiding fluid second level impeller, such as Fig. 4.When impeller in figure by being rotated clockwise, water is by leaf figure Wheel throws to surrounding, and due to the effect of centrifugal force, water forms the closed circular for being similar to equal thickness for being decided by pump chamber shape Ring.The lower portion inner surface of water ring is just tangent with impeller hub, and the upper inside surface of water ring just contacts with blade tip (real Border blade has certain insertion depth in water ring).A crescent-shaped space is formed between impeller hub and water ring at this time, and This space is divided into several small chambers equal with lobe numbers by impeller again.If with 0 ° of the lower part of impeller for starting point, The volume of small chamber changes from small to big impeller at 180 ° before rotation, and communicates with the air entry on end face, and gas is inhaled at this time, when Small chamber then completely cuts off with air entry when air-breathing end of a period；When impeller continues rotation, small chamber forms variable volume from large to small, makes gas It is compressed；When small chamber is communicated with exhaust outlet, it is outer that gas is just discharged pump.Due to being an Ordinary Centrifugal Pumps leaf after water on water lift Wheel construction, it is possible to which according to demand, setting mentions the impeller for meeting traffic requirement within the allowable range.

It is segment pump case after pump spiral case, the impeller in the pump case of segment is the tangent line impeller of semi-open type, and blade is into rotation The heart is in radial pattern structure, and the rotation speed of fluid is approximately equal to the rotation speed of impeller.The tangent to periphery and exit of pump of blade Direction is in 90 °.Because of the structure of tangent line impeller, outlet pressure constant pressure when water pump operation, load changes with the variation of flow.Section There are vortex chamber, impeller makes rotating motion under the driving of axis in pump back cavity at the enclosure interior place opposite with impeller of section pump case, flows Body is directly or indirectly acted on by impeller does strong axial vortex movement in pump chamber.Vortex intermediate pressure is lower, it is thus possible to Continuously suct liquid.Axial vortex movement increases pressure and peripheral speed radially constantly, and in periphery, formation has The circulation of certain energy finally becomes perforation stream discharge pump chamber.Due to unshrouded impeller structure, liquid is thrown to pump inner casing to impeller On, liquid is returned to impeller by pump case rotation cavity configuration, then pressurizeed and got on pump inner casing again by impeller, liquid is more in runner Secondary eddy flow pressurization, to reach the process of monolithic pressurizing propeller high pressure-charging.

The centrifugal water pump of the utility model is provided with plunger pump low discharge, high pressure, outside high suction capacity, overcomes The shortcomings that existing centrifugal pump is as high pressure cleaning pump, allows the knot of equipment at the drawbacks of also fundamentally solving plunger pump in operation Structure is simpler, and operation is more stable, and can effectively save Energy in use, the stability for improving efficiency and applying, so as to It is suitable for high-pressure cleaning device well.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the centrifugal water pump of the utility model.

Fig. 2 is the schematic diagram for pumping spiral case section.

Fig. 3 shows tangent line blade wheel structure schematic diagram to be half-open.

Fig. 4 is the sectional view along A-A of Fig. 3.

Specific embodiment

Such as Fig. 1, a kind of centrifugal water pump, including pump case 1 and by bearing installation with the rotatable pump shaft 2 in pump case both ends, One end of pump shaft is stretched out on the outside of pump case, and the connecting component of installation connection power input device in section of stretching out, the connecting component can Ring flange 3 is thought, such as Fig. 1.Two sections of the front and back that pump case 1 is divided to be connected, leading portion are pump spiral case 11, and back segment is segment pump case 12；? The eccentric rotor 4 of fixed blade is provided in pump spiral case；The tangent line impeller 5 of semi-open type is installed in the pump case of segment, it is half-open The blade of formula tangent line impeller to rotation center be in radial pattern structure, such as Fig. 3, Fig. 4.

In order to improve the efficiency of impeller operation, flow resistance is reduced, impeller can rotate 15 ° towards tangential direction, such as Fig. 3.

The tangent line impeller 5 of more than two semi open models can be arranged side by side on pump shaft in the segment pump case.Pass through increase Pressure can be improved to meet actual demand in the mode of impeller quantity.

2 section of stretching out front end of pump shaft may be provided with The gear deceleration structure, driving equipment can be made to have more selectivity in this way, And influence of the play to driving equipment between multi-stage water pump can be effectively prevented.

Claims (4)

1. a kind of centrifugal water pump, including pump case (1) and pass through bearing installation and the rotatable pump shaft in pump case both ends (2), pump shaft One end stretch out on the outside of pump case, the connecting component of installation connection power input device in section of stretching out；It is characterized by: the pump case It is divided into two sections of connected front and back, leading portion is pump spiral case (11), and back segment is segment pump case (12)；Fixation is provided in pump spiral case The eccentric rotor (4) of blade；The tangent line impeller (5) of semi-open type, the blade of semi-open type tangent line impeller are installed in the pump case of segment It is in radial pattern structure to rotation center.

2. centrifugal water pump according to claim 1, it is characterised in that: the semi-open type tangent line impeller can be towards tangent line side To 15 ° of rotation.

3. centrifugal water pump according to claim 1, it is characterised in that: can be set side by side on the pump shaft in the segment pump case Set the tangent line impeller of more than two semi open models.

4. centrifugal water pump according to claim 1, it is characterised in that: pump shaft section of stretching out front end may be provided with The gear deceleration Structure.