CN2046958U

CN2046958U - Hydraulic-control delayed on-off non-return valve

Info

Publication number: CN2046958U
Application number: CN 89204036
Authority: CN
Inventors: 杨玉思
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-04-06
Filing date: 1989-04-06
Publication date: 1989-11-01

Abstract

The utility model provides a slow-opening slow-stopping check valve which can automatically suppress the pressure fluctuation in the process of the starting and stopping of the fluid pressure pump. The valve is composed of a valve body and a hydraulic cylinder. A piston in the hydraulic cylinder controls the opening and the closing of the valve clack via a slide slot. The distinctive feature is that the slow-opening slow-stopping check valve not only can prevent the water hammering when the pump is stopped, but also can prevent the water hammering when the pump is started; when the pump is started, the man is not needed to operate and adjust the valve, which saves the labor, and eliminates the accident potential brought by the false operation, moreover, provides the convenience for the automation control of the pump station; furthermore, the valve also has advantages of noiseless operation, small abrasion, energy saving, etc.

Description

Hydraulic-control delayed on-off non-return valve

The utility model relates to a kind of buffer valve, when water in pipeline during reverse flow, this valve can automatically slowly cut out, thereby reduces the pressure surge that the refluence water yield and pump-stopping water hammer cause effectively.The utility model is particularly related to the device of pressure surge in the suppression fluid compression pump start-up course.

In water-carriage system, when compression pump starts or closes when too fast, all can cause the unexpected variation of water velocity in the pipeline, thereby cause pressure surge, the former claims to open the pump water hammer, and the latter claims pump-stopping water hammer.Particularly in the compression pump start-up course, when still having air not to be discharged from the pipeline section of water-filling, will produce violent pressure surge, may cause compression pump and Analysis of Pipe Vibrations even destruction.

In actual water-carriage system, Chang Yin opens the pump water hammer and causes adverse consequences, and what have also causes a serious accident.A shortcoming of the buffer valve that has earlier is to prevent to open the pump water hammer effectively, in the termination of pumping process, this buffer valve slowly closes flap by Slow Close mechanism to reach the purpose that alleviates pump-stopping water hammer, but its Slow Close mechanism is not controlled by manifold pressure in opening the pump process, thereby can not prevent to open the pump water hammer effectively.Current practice is the opening speed of control gate plate valve artificially, to alleviate the pressure surge of opening in the pump process.This not only brings operating difficulties, and still has damaging property to open the accident potential of pump water hammer.

The utility model is intended to keep under the basic premise that the buffer valve that has earlier prevents pump-stopping water hammer, according to opening reasons for pressure fluctuation in the pump process, make the Slow Close mechanism of flap of oil hydraulic cylinder, and establish a control spring therein, make the size of flap open degree be subjected to the control of pressure in the pipeline, reach the purpose that prevents to open the pump water hammer, and provide a kind of mistake flow resistance little, the buffer valve that adjusting function is good.

Buffer valve of the present utility model is made up of valve body and oil hydraulic cylinder.Have two discharge orifices on the axial diverse location of cylinder wall, it is communicated with valve body with conduit.When manifold pressure is reduced to a certain degree or during the water reverse flow, the oil hydraulic cylinder internal pressure is higher than manifold pressure, water flows to pipeline through conduit in the oil hydraulic cylinder under this differential pressure action, piston (or down) to the right moves the speed controlling that its travelling speed is subjected to water inflow pipe in the oil hydraulic cylinder, two discharge orifices on the cylinder wall make speed that water flows out cylinder body first quick and back slow, the closing velocity of flap also just first quick and back slow, thereby reduced pump-stopping water hammer effectively.

Before compression pump begins to start, flap is in the closed position, during pump startup, flap is opened and is caused piston displacement, the elastic force effect of the controlled spring in piston back, the piston front is subjected to the pressure effect of water in the pipeline, water body pressure increases in the pipeline, moves after making piston, and the flap open degree increases, spring is compressed, and supports counter-force to increase; When the water-filling pipeline section long or its in when having more air not to be discharged from, manifold pressure is lower, corresponding flap open degree is also very little, limited the increase suddenly of water velocity in the pipeline in this case, this helps the discharge of air and is avoided high-velocity flow at ducted bump, thereby can prevent to open the pump water hammer effectively.When manifold pressure near or when reaching normal operating pressure, piston is pressed on the threaded stem head, the flap open degree reaches maximum and does not fluctuate with the minor variations of pressure, thereby reduces wear and operating noise etc.When pipeline overhauled, flap can screw by handwheel, played the maintenance valve.

The utility model can either prevent pump-stopping water hammer effectively, also can prevent to open the pump water hammer automatically effectively, thereby provides a kind of perfect safety protection device for water-carriage system.And in proper functioning, this valve resistance is very little, has energy-conserving action, also is subjected to the control of manifold pressure because of the unlatching of flap, can save manpower.For the pumping station automatization operation is provided convenience.

Describe the concrete structure of the utility model hydraulic control slow open and close safety check in detail below in conjunction with accompanying drawing.

Accompanying drawing is the vertical face sectional drawing of a kind of concrete structure of the utility model.

With reference to accompanying drawing, valve body 1 is formed an airtight fluid passage with valve gap 2, rocking bar 4 is hinged by rotating shaft 3 and valve interior wall, one end of rocking bar 4 is equipped with bearing pin 9, valve block 6 is hinged with the other end of rocking bar 4 by bearing pin 5, seal ring 7 is housed on the valve block 6, on corresponding valve seat, lower seal 27 is being housed, so that water-tight when fastening valve.Bearing pin 9 is sleeved in the chute 8, can slide in chute, and chute 8 usefulness back of the body cap 11 is connected with the piston rod of piston 13, and piston 13 slides in oil hydraulic cylinder 14, and O-ring seals 28 is housed.Oil hydraulic cylinder 14 usefulness conduits 12 are communicated with valve body,

regulator

29 and 30 are housed on the conduit 12,

regulator

29 and 30 effect are that oil hydraulic cylinder is communicated with the left and right sides valve body of flap respectively, so that realize stable the keying.Have exhaust port 15 on the oil hydraulic cylinder 14, make the piston left end keep barometric pressure, the oil hydraulic cylinder 14 usefulness back of the body covers 16 sealings.Threaded stem 20 and a cylindrical sleeve nut 21 are tightened, threaded bush 21 right-hand member has a cylindrical flange 22 and a sleeve bolt 24, threaded bush 21 passes and carries on the back the complimentary aperture of covering on 16, flange plate 22 is pressed on the back of the body and covers on 16 the internal surface, left end near threaded bush 21 is being fixed a handwheel 17, with its turnbarrel nut 21 like a cork, the left side threaded bush 21, a stop nut of tightly twisting 19 and gland nut 31 are arranged on the threaded stem 20, threaded bush's 21 left ends have an annular bearing plate 18, tighten stubborn another stop nut 23 and gland nut 10 at sleeve bolt 24, one end of spring 25 is limited by the stop nut that tightly is screwed in sleeve bolt 24, and the other end and piston 13 are not subjected to the hydraulic pressure side contacts.Threaded stem 20 right-hand members have a hemisphere bar head 26, it and the groove above the piston 13 can finely coincide, piston 13 is not subjected to the hydraulic pressure side also to weld a slide bar 32, it passes the chute on the hemisphere threaded stem head 26, and threaded stem 20 can move forward and backward when making rotation handwheel 17.Above-mentionedly 24 all can be easily cover 16 and together dismantle with the back of the body from handwheel 17 to sleeve bolt.

In normal working, gland nut 31 is close proximity to the left surface of annular bearing plate 18, the hemisphere bar head 26 of threaded stem 20 is adjusted to and allows the flap open degree to reach maximum, at this moment piston 13 contacts and compresses with the hemisphere bar head 26 of threaded stem, and spring 25 is compressed and makes elastic force to reach maximum value.When this maximum elastic force value is designed to proper functioning 85～95% of piston left end total pressure, like this, can guarantee the flap working stability, the resistance minimum.

This valve also can be used in the system that carries other liquid, also can use at the compressed air pipeline, to eliminate noise and energy-conservation.

Claims

1; a kind of by valve body 1; valve gap 2; oil hydraulic cylinder 14; conduit 12; the hydraulic control slow open and close safety check that in pressurized with fluid pump opening-closing process, plays the safety protection effect that chute 8 and valve block 6 are formed; it is characterized in that: oil hydraulic cylinder 14 flatly is installed on valve body 1 left side; by input end top, valve body 1 determined fluid passage; or vertically be installed on the top of valve body; valve block 6 is hinged on the end of rocking bar 4; the bearing pin 9 of rocking bar 4 the other ends is sleeved in the chute 8; chute 8 is connected with piston 13 in the oil hydraulic cylinder 14 by back of the body cap; piston 13 is not subjected to the hydraulic pressure side to establish a control spring 25; the stop nut 23 that its end tightly is screwed on the sleeve bolt 24 limits, and oil hydraulic cylinder 14 is communicated with valve body by conduit 12.

2, the slow open and close safety check of stipulating by claim 1, it is characterized in that: above-mentioned threaded bush 21, sleeve bolt 24 become one, and can cover 16 together dismounting easily with stop nut 23, spring 25, the back of the body.

3, press the slow open and close safety check of claim 1 defined, it is characterized in that: have two discharge orifices on the oil hydraulic cylinder 14 vertically, and be communicated with valve body 1 determined fluid input end and output terminal respectively with conduit 12.