CN2138224Y

CN2138224Y - Check valve without block hammer

Info

Publication number: CN2138224Y
Application number: CN 92235610
Authority: CN
Inventors: 赵福远
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-24
Filing date: 1992-09-24
Publication date: 1993-07-14
Anticipated expiration: 2002-09-24

Abstract

The utility model belongs to the technical field of the universal machine, in particular to a check valve without a block hammer which is used in the liquid conveying pipeline. The check valve is composed of a valve body, a rotating shaft, a resistance force arm, a valve plate, a power arm and a speed-change hydraulic device. The speed-change hydraulic device can control the raising opening degree of a valve plate in 100% by making use of the pressure force of the fluid in the check valve, the impact force of the liquid to the valve plate, and the self weight of the valve plate to drive the self of the speed-change hydraulic device, and the nonresistance to the fluid is realized. The back-stop procedure controlled by the valve plate in the speed change is obtained by making use of the different displacement of the sliding piston rod and the piston to the liquid. Consequently, the purpose of completely eliminating the generation of the water hammer is obtained.

Description

Check valve without block hammer

The utility model belongs to the universal machine technical field, a kind of no block hammer safety check of particularly using in the conveyance fluid pipeline.

In the conveyance fluid pipeline that promotes with pump, power failure or other mechanical accident are unavoidable suddenly.Cause reversing of pump hypervelocity or pump house to be flooded for preventing that fluid flows backwards in the pipeline, often all safety check is housed in the outlet port of pump.

At home, " Tiny Drag Slow Shut Check Valves " (the 14th in ［ 1987 ］ No. 207 files of section of committee " about assigning the notice of the tenth batch of energy-conserving product promotion project of mechanical industry " according to circumstances) that seven committees such as present national Machinery Industry Commission (portion) promote be gain the national patent power (apply for a patent name and be called a kind of micro-damping spacing hammer safety check, the applying date 861108, application number 86209015) once.Though this safety check belongs to very clear and bright person at present at home, still has deficiency: although the one valve plate is lighter, revolves by fluid and open, convection cell still has certain resistance; Its two valve plate has Strike note and buffering aperture less when contacting with small piston when non-return, still do not reach and eliminate water hammering fully.

The utility model is intended to overcome the above-mentioned defective of prior art, and noiseless and can eliminate the no block hammer safety check of water hammer fully when providing a kind of valve plate to open back convection cell non-resistance, check.

For achieving the above object, technical solution of the present utility model is: the check valve body peripheral hardware one compensator pressure device of being made up of valve body, running shaft, resistance arm and valve plate.This device is to be made of cylinder body, sliding piston bar, piston, hydraulic tube and throttle valve etc., can slide in piston hole in the bottom of sliding piston bar total travel.The top and the bottom of cylinder body being connected by hydraulic tube and throttle valve and safety check into and out of water end (W.E.).The upper end of sliding piston bar links by power arm and running shaft, running shaft again with valve plate on resistance arm link.To be the pressure that utilizes the safety check inner fluid, fluid drive the compensator pressure device to the deadweight of the impact force of valve plate and valve plate to this compensator pressure device controls and play aperture on the valve plate and can reach 100%, realizes that convection cell is unresisted; Utilize the different check processes that reach the speed Control valve plate of discharge capacity of sliding piston bar and piston convection cell again, eliminate the purpose that water hammer produces fully thereby reach.

Owing to take above-mentioned technical solution, advantage of the present utility model: the one, shockproof during work, noiseless, long service life; The 2nd, the valve plate aperture can reach 100%, the convection cell non-resistance; The 3rd, valve plate is variable speed when check, can thoroughly eliminate water hammer and produce.

Fig. 1 is a sectional view of the present utility model

Fig. 2 is a front view of the present utility model

Fig. 3 is the left view of Fig. 2

Fig. 4 is the structural representation of compensator pressure device in the utility model

Below in conjunction with accompanying drawing, further set forth specific embodiment of the utility model and working principle thereof.

Referring to Fig. 1, Fig. 2, Fig. 3 as can be known, the utility model is made up of valve body 1, running shaft 2, resistance arm 3, valve plate 4, power arm 5, compensator pressure device 6.Running shaft 2 strings are on valve body 1, and part and resistance arm 3 key connecting in valve body 1 are in valve body 1 outer end and power arm 5 key connecting.Resistance arm 3 is hinged with valve plate 4 again.

Referring to Fig. 4 and Fig. 2 as can be known, the compensator pressure device 6 in the utility model is by formations such as cylinder body 12, sliding piston bar 13, piston 14, hydraulic tube (7,10), throttle valve (8,11) cylinder seats 9.The bottom of sliding piston bar 13 total travels can be moving in the hole of piston 14, and its upper end and power arm 5 are hinged.Communicate with the going out of safety check, feed-water end respectively by hydraulic tube (7,10) and throttle valve (8,11) at the upper and lower opening of cylinder body 12.

The pressure, fluid that the compensator pressure device utilizes the check valve body inner fluid to the deadweight of the impact force of valve plate and valve plate drive the sliding piston bar drive power arm ← → running shaft ← → resistance arm ← → valve plate, control the speed and the aperture that play the whereabouts on the valve plate, reach the function that safety check is realized no block hammer.Concrete working principle is as follows:

During pump work: fluid is entered the bottom of cylinder body 12 by throttle valve 11 and hydraulic tube 10 by the feed-water end of valve body 1.Because the lifting rate of sliding piston bar 13 is less, fluid pushes away its fast rise and assists valve plate 4 fast rise under the impact of fluid, and the aperture that can increase valve plate this moment fast is to reduce the starting current of pump.When the lower shoulder a of sliding piston bar 13 contacted with piston 14 lower end surfaces, sliding piston bar 13 rose jointly with piston 14, until making valve plate 4 apertures reach 100%.Because the resisting moment that the braking torque that sliding piston bar 13 is produced under cylinder body 12 bottom flow pressure effects is produced greater than valve plate 4 deadweights, valve plate 4 can not keeping, and aperture can reach 100%, and convection cell does not produce resistance.

When pump quit work: liquid is commutation fast, because cylinder body 12 bottom pressure reduce, the braking torque of sliding piston bar 13 is far smaller than the resisting moment that valve plate 4 deadweights produce, valve plate 4 hurtle down (purpose is to reduce the capacity of reflux of fluid).When sliding piston bar 13 upper shoulder b and common decline after piston 14 upper-end surfaces contact, because lifting rate increases, at the effect lower valve plate 4 of throttle valve 11 Slow Close progressively, make the fluid in the pipeline that certain capacity of reflux be arranged, the impact that this has just alleviated current reaches and eliminates the destruction of water hammer to pipeline fully.

Claims

1, a kind of no block hammer safety check, this is made up of valve body (1), running shaft (2), resistance arm (3), valve plate (4), power arm (5), compensator pressure device (6), it is characterized in that running shaft (2) string is on valve body (1), running shaft (2) in valve body (1) and resistance arm (3) key connecting, resistance arm (3) is hinged with valve plate (4) again, running shaft (2) and power arm (5) key connecting in valve body (1) outer end.

2, safety check according to claim 1, its feature is that also compensator pressure device (6) is made of cylinder body (12), sliding piston bar (13), piston (14), hydraulic tube (7,10), throttle valve (8,11) and cylinder seat (9), the upper end of sliding piston bar (13) and power arm (5) are hinged, and the upper and lower opening of cylinder body (12) communicates with the going out of safety check, feed-water end respectively by hydraulic tube (7,10) and throttle valve (8,11).

3, according to claim 1,2 described safety check, its feature is that also the bottom of sliding piston bar (13) total travel can slide in the hole of piston (14).