CN2356167Y - Self suction centrifugal pump - Google Patents

Abstract

The utility model relates to a self-sucking centrifugal pump, which is formed by that a centrifugal pump is verticality arranged in a box body which can store liquid; the upper and the lower parts of the box body are separated; a sucking port of the pump extends downwards to a lower box body to obtain large space for storing the liquid, and thus the self-sucking pump stores multiple liquid after stopped to be favorable to high-speed starting for water out; once liquid stord ensures repeated starting work. Because multiple liquid is stored, sealing is always immersed in the liquid, and shaft sealing is not easy to be damaged. The utility model can be used for conveying different supernatant liquid and material slurry, but can not damage impellers.

Description

A kind of self priming centrifugal pump

Model utility relates to a kind of improved self priming centrifugal pump.

Self priming centrifugal pump is owing to have self-absorption function, thereby is applied in many occasions.Existing self-priming pump generally mostly is horizontal type structure, and the liquid storage chamber storage working solution that liquid entering hole by being higher than a center and S-shaped water inlet flow channel and pump housing bottom are outstanding reaches the work of exhaust self-priming.This structure of self-priming pump is because the liquid storage chamber is less, and the liquid phase that starts to work of bringing storage is to less, thereby self-priming fluid speed is slow; And less liquid storage stability also is subjected to shaft sealing to influence fluctuation; add and shut down anti-siphon poor performance; the liquid that starts to work that has siphon just can be directed at the pump stored slightly is reduced easily or finds time, fast self-priming fluid work once more after influencing self-priming pump and shutting down, thereby restart poor performance.Because pump stored working solution is few, and fluid speed is slow, make pump when long period self-priming starting operation is worked in addition, friction generates heat with the impeller that runs up for less work liquid, and less work liquid is heated up rapidly, also can influence the shaft seal life-span.And pump in the working solution deficiency be directed at self-priming pump find time the running, also can cause the damage of pump shaft mechanical seal.When carrying chance air easily-crystallized liquid, the leakage of shaft seal also can produce crystal in shaft sealing place.Because liquid storage is at pump chamber, thereby be not suitable for inhaling the feeding slurry.

The purpose of model utility is to overcome the deficiency of above-mentioned prior art, provides a kind of cost low, and liquid storage is many after shutting down, and stable difficult leakage of liquid storage, and self-priming performance is good, helps the self priming centrifugal pump of the quick fluid work of self-priming.

The model utility purpose realizes, but main improve be centrifugal pump is vertically placed a liquid storage and the casing separated up and down in, and make under the Pump Suction Nozzle and reach lower box.Specifically, the model utility self-priming centrifugal pump, comprise the centrifugal pump of forming by pump cover, pump case, impeller, pump shaft, shaft sealing, with water intake, water outlet and liquid storage chamber, it is characterized in that said liquid storage chamber is made of the casing that laterally is separated into upper cavity and lower chamber, said centrifugal pump vertically places upper cavity, extend in the lower chamber under the mouth piece, said water intake is located at lower chamber, and water outlet is located at upper cavity, and the water intake intake pipe has anti-siphon means.Because centrifugal pump has bigger liquid storage space and anti-siphon means, can store the liquid that starts to work of q.s like this, thereby overcome existing self-priming pump because the defective that liquid storage brings less.

The said pump case of model utility can be a volute, also can be circular shell.Said casing, effect are to rise to deposit working solution after shutdown, thereby amorphism restriction, can be rectangular box, can also be other cylindrical shells, but wherein especially with cylindrical body for well.Said intake pipe anti-siphon means; effect be when shutting down, prevent siphon produce the liquid storage chamber in liquid find time; it can be to be provided with one way stop peturn valve in the water intake (pipe); also can be between intake pipe and upper cavity, the siphon destructing tube that is communicated with to be set; but wherein be combined into both especially; when one way stop peturn valve was not closed completely, siphon destructing tube was because air inlet destroys siphon like this.Said shaft sealing In-particular is sealed into excellent with K shape.

Below in conjunction with an indefiniteness embodiment's description, further specify the model utility structure.

Accompanying drawing is a kind of mode of execution structural representation of model utility.

Embodiment: referring to accompanying drawing, cylindrical shape liquid storage body 1 (can be that plastics are simplified, also can be inner lining structure) is separated into upper cavity 1.1 and lower chamber 1.2 by lateral partitions 14.Wherein upper cavity has pump discharge 13, in place vertically by the impeller 7 of pump shaft 9, band back blade 8, by the pump case 15 of liquid outlet, the centrifugal pump that pump cover 6 is formed, pump shaft has outward on axle sleeve and the sealing case 1, in have the K profile shaft to seal 10.Centrifugal pump suction (mouth) pipe extends the nearly bottom of lower chamber 5 times.The water intake on lower chamber top upwarps intake pipe 2 and one way stop peturn valve 4, and evacuation port 12 is arranged at the bottom.There is siphon destructing tube 3 to be communicated with between upper cavity and intake pipe.Inject working solution before working first earlier, when pump starts to work, the impeller rotation of high speed rotating forms strong suction, the working solution of storage in the lower chamber 1.2 is inhaled into by pump suction (mouth) pipe 5, enter upper cavity 1 through the pump housing, 1, the air decompression of carrying is overflowed by pump discharge and is discharged, and reaches the work of self-priming fluid thereby repeat said process.During shutdown, the one way stop peturn valve of pump inlet end is closed according to gravity, has prevented the generation of siphon, keeps more work liquid storage in the cylindrical shell thereby make.If one way stop peturn valve is not closed completely, then also destroy siphon, the liquid storage after guaranteeing to shut down by the siphon destructing tube 3 that is communicated with upper cavity and intake pipe.The sealing of pump shaft relies on back impeller to form down pressure and effectively stops pump chamber liquid to leak along axle during work; Shutting down the back seals by K type seal lip.The drain of lower chamber bottom is convenient to change fed sheet of a media.Suction sleeve extends the bottom down, helps starting once more.K shape lip pressure is big more, and it is good more to seal, and so also can prevent to shut down the outlet impact of water hammer, thereby the safety check of water hammer can be prevented in the outlet port; And when work because the effect of back blade, seal lessly to the pressure of axle, seal not fragile.

Model utility is not only shut down the back shaft seal and well can not leaked owing to centrifugal pump vertically being placed in the casing in big liquid storage space, effectively avoids leakage to produce crystallization; And liquid storage is many after shutting down, and helps the quick starting water outlet, and one time liquid storage is guaranteed re-lighting work.Model utility also because liquid storage is many, can make shaft seal be immersed in all the time in the liquid, has avoided opening the damage that empty wagons causes shaft sealing; Pump chamber separates with the liquid storage chamber; contain the slip of solid for conveying, solid precipitation thing and impeller are separated be deposited in the liquid storage chamber, help depositing the activation of mud when starting once more; can effectively avoid centrifugal pump to shut down back solid precipitation thing and damage impeller, thereby applicable to inhaling the feeding slurry.Employing not only can resist and shut down impact of water hammer in the outlet pipe according to the K shape sealing of hydraulic pressure self-regulated sealing load in the pump, and has prolonged the working life of sealing.Also to have a cost low for model utility in addition, and purposes is wide, and the more similar self-priming pump of cost reduces 30%.

Claims (8)

1, a kind of improved self priming centrifugal pump, comprise the centrifugal pump of forming by pump cover, pump case, impeller, pump shaft, shaft sealing, with water intake, water outlet and liquid storage chamber, it is characterized in that said liquid storage chamber is made of the casing that laterally is separated into upper cavity and lower chamber, said centrifugal pump vertically places upper cavity, extends in the lower chamber under the mouth piece, and said water intake is located at lower chamber, water outlet is located at upper cavity, and the water intake intake pipe has anti-siphon means.

2,, it is characterized in that said casing is a cylindrical body according to the described self priming centrifugal pump of claim 1.

3,, it is characterized in that said shaft sealing is the sealing of K shape according to claim 1 or 2 described self priming centrifugal pumps.

4,, it is characterized in that extending under the said mouth piece the nearly bottom of lower chamber according to claim 1 or 2 described self priming centrifugal pumps.

5, according to claim 1 or 2 described self priming centrifugal pumps, it is characterized in that being provided with one way stop peturn valve in the said water intake.

6,, it is characterized in that between said upper cavity and water intake intake pipe the siphon destructing tube that is communicated with being arranged according to the described self priming centrifugal pump of claim 5.

7,, it is characterized in that the impeller of said impeller for the band back blade according to claim 1 or 2 described self priming centrifugal pumps.

8,, it is characterized in that drain is arranged at said lower chamber bottom according to claim 1 or 2 described self priming centrifugal pumps.