CN1328216A

CN1328216A - Non-vacuumizing start of large centrifugal water pump

Info

Publication number: CN1328216A
Application number: CN 01123792
Authority: CN
Inventors: 董铁民
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-02
Filing date: 2001-08-02
Publication date: 2001-12-26

Abstract

A non-vacuumizing start technique of large centrifugal water pump features that a check valve is installed at water inlet of water pump and the movable planar valve plate of said check valve and the sealing surface of valve seat are inclined. When the pressure difference across the valve is zero, under the action of gravity, the valve plate is in vertical position, so not closing the valve seat and realizing non-vacuumizing start.

Description

Non-vacuumizing start of large centrifugal water pump

Generic water conservancy projects of the present invention is applied to startup, the shut-down operation of large centrifugal water pump.

Be applied to the large centrifugal water pump of water conservancy projectss such as water factory, water lift pumping plant, the overwhelming majority is as described below for their startup, shut-down operation pattern:

Start: close outlet valve, start vacuum pump and make water be full of this pipeline, start pump motor, open outlet valve then vacuumizing to this section of water inlet sealing pipeline through the pump housing from outlet valve, normal outside water supply, startup is finished.

Stop: close outlet valve earlier, the pump of cutting off the water again.

Although this start-up mode principle is reasonably, operation also is practicable, thereby nearly all large centrifugal water pump all adopts this pattern to start, but the problem that haves much room for improvement below existing:

1, vacuum pump is that main vacuum system had both increased content of operation and link, is unfavorable for realizing automation mechanized operation, occupies very considerable investment in whole water system again.

2, the operation that starts, stops because of must be attached in the closing, open of large scale outlet valve, thereby brought the drawback of operating loaded down with trivial details effort and valve leak.

The objective of the invention is to get rid of vacuum pump is main vacuum system, realizes that the non-vacuumizing pattern starts; Cancellation the closing of flowing water Valve, open operation realize the optimization control of " only put knob, need not movable valve ".

As follows for reaching the technological scheme that goal of the invention takes:

The free cheek valve plate 1 of this check valve of the different check valve of a kind of principle and structure and prior art (seeing Figure of description 1) and the sealing plane A-A of perforate valve seat 2 are installed at one section horizontal pipe water inlet place in pump water inlet road favour gravitational direction B-B, movable valve plate 1 is at oblique downside and in intake pipe 3.Such structure is when pressure reduction is zero before and after the valve, movable valve plate 1 can not be closed with valve seat 2 because of vertical position, the gravity place of itself, after the large centrifugal water pump termination of pumping in the running, system's hydraulic pressure is reverse, valve plate 1 oblique upper can be closed in valve seat 2 planes to extruding,, water can not be flow backwards as accompanying drawing 2, need not close outlet valve, (also just need not open outlet valve when restarting certainly); When restarting water pump, because of movable valve plate 1 gravity own can quicken its unlatching, avoided because of the large centrifugal discharge of pump is big, the phenomenon that stops of finding time that the check valve opening speed lags behind and causes makes the starting mode of pump success.

The present invention is that lift has certain requirement to exit of pump pressure, can not be lower than 5 meters, and reason is to cross when low when lift, and hydraulic pressure is too little, and movable valve plate is because of the too for a short time unreliable reverse pouring that causes of closing that is stressed during termination of pumping.But this is not a problem concerning facilities such as water factory; In addition, when this technology is gone into operation after original operation of water factory's pumping plant or overhaul, although also still must vacuumize or submersible pump pours in down a chimney water, but desired volume is more much smaller relatively than prior art, the more important thing is and to start once, one treats that whole system has hydraulic condition, and startup and later startup all need not vacuumize once more.

This invention not only has the advantage of getting rid of vacuum pump, simplifying the operation, reducing pumping plant investment for prior art, has also relatedly solved the most nerve-wracking problem of water factory--the leakage of-large scale gate valve or butterfly valve.The used check valve of this invention is because of belonging to plane wiper seal in opposite directions, and water system hydraulic pressure high sealing is reliable more more, it is very little to open, close caused wearing and tearing repeatedly, the reliability height, easy to leak flows backwards; And the large scale valve of prior art mostly adopts gate valve or butterfly valve, belongs to peg graft sealing and friction sealing, pump of every start-stop must open, cut out valve one time, and the time is not long, just, perseveration causes leakage, the water that flows backwards when serious even cause the water pump counter-rotating because of causing wearing and tearing.Change that such valve time-consumingly takes, power, the value of valve itself is also high.Just because of this, even the large centrifugal water pump that the pump housing need not vacuumize underwater, it also is useful at the water inlet place such check valve being installed.

Claims

Non-vacuumizing start of large centrifugal water pump of the present invention is used for the startup of large centrifugal water pump, is not having vacuum pump to vacuumize and is pumping water and cut down and close, under the situation of open operation, can reach and the duplicate effect of prior art, it is characterized in that:

A kind of non-return cutting down installed at intake pipe mouth of pipe place at water pump, this free cheek that cuts down cuts down plate and favours gravitational direction with the sealing plane that cuts down seat, cut down the oblique downside in plate place and in intake pipe, cut down plate when pressure reduction is zero before and after cutting down because of vertical position, gravity place own, not with cut down seat and close; And the check valve of prior art all cuts out in the case, and only because of this difference, when the water pump of running stopped, system's hydraulic pressure cut down plate with activity and presses in cutting down a plane it is closed, and water can not flow backwards, and need not close water outlet and cut down door; When restarting outside water supply certainly, do not have the operation of unlatching yet, when restarting water pump, can quicken it and open, avoid cutting down the phenomenon that stops of finding time that opening speed lags behind and causes, make water pump normally start water supply because of discharge of pump is big, non-return because of cutting down the gravity of plate own.