CN1071498A

CN1071498A - Balance cavity type liquid level control valve

Info

Publication number: CN1071498A
Application number: CN 91109256
Authority: CN
Inventors: 王庆元
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-10-08
Filing date: 1991-10-08
Publication date: 1993-04-28

Abstract

A kind of mechanical type fluid level control valve, adopt counter balance pocket back-pressure sealing principle, overcoming traditional float valve control liquid level and sealing influenced by the source pressure surge of pipeline liquid, the long big shortcoming of size that takes up room of while float lever length, this valve is made of balance chamber and interior dress bacterium shape pressure release valve gap, uses opening well-bucket or ball float directly to control, need not add lever again, thereby overall dimension is little, and is easy for installation, is easy to repack into the heatproof corrosion resistant structure.

Description

Balance cavity type liquid level control valve

The present invention relates to a kind of fluid level control valve, particularly a kind of balance cavity type liquid level control valve door that need not outer float.

The fluid level control device of common mechanical formula often uses float valve, its float lever has certain length, width or the less container of diameter are difficult to be suitable for, and less in liquid level change than the height that hour ball float descends, and the aperture that drives valve through connecting rod is also little, flow is restricted, mutually far short of what is expected with its nominal size bore, to the fluid infusion time lengthening of major diameter container, in addition, controlled liquid level height just changes with pipeline liquid source pressure, and control accuracy is not high.When manifold pressure has sudden change to raise,, the reliability of valve is reduced because ball float buoyancy is to determine that the unexpected rising of sealed mouth place pressure promptly can cause leakage phenomenon.For overcoming the pipeline pressure at sealing bore place, need be provided with long lever, thereby the size that takes up room is installed just needs to strengthen, perhaps adopt larger sized ball float.

For reducing occupation of land size patent 89206850 a kind of differential pressure type altitude valve has been proposed.Ball float is placed in the body, overall sizes is significantly reduced, but its floating ball diameter but will be very limited, buoyancy is less.Its balance cylinder's pressure relief opening is directly controlled switching at the center by ball float buoyancy, because buoyancy is less, leans on the direct buoyancy of ball float to be difficult to block central small hole when liquid source pressure raises and out of hand.

Generally only select electronic control system when the usage requirement precision is higher for use, relate to another energy this moment again, and cost high requirement maintenance professional technical is strong.

For overcoming the shortcoming of above-mentioned two class liquid level valves, following improvement project is proposed.

Task of the present invention is that not only its installing space size is less for a kind of new mechanical type fluid level control device of proposition, to the liquid level change sensitivity, not influenced by extraneous pipeline liquid source variation in pressure, flow and simple and reliable for structure cheaply practical plan corresponding with nominal caliber size.

Task of the present invention is achieved in that

1, adopts balance chamber's principle, make and seal sealing load and change the reliability of raising sealing part with fluid pressure in the pipeline.

2, adopt narrow slot pressure relief opening and cooperate bacterium shape pressure release valve cover structure, it is easily blocked to overcome aperture, and the bigger weakness that needs large scale float coupling of macropore closing pressure reduces the requirement to buoyancy, thus the long lever transmission system of cancellation.

3, replace float thoroughly to eliminate float with the opening well-bucket, and can reduce cost by corrosion insecure weakness of boring a hole.Further set forth concrete structure of the present invention below in conjunction with accompanying drawing.

Structure of the present invention is made up of counter balance pocket, bowl-type diaphragm or bellows, upper and lower valve body, bacterium shape pressure release valve gap, sealing gasket, opening well-bucket, spring.

Accompanying drawing 1 is made a kind of practical example of sealed mouth for adopting the bowl-type diaphragm:

There is the liquid source of pressure to enter valve body in the pipeline, in the central small hole a of spool 7 enters the b of balance chamber generation, presses to promote bowl-type diaphragm 6 blocked center passages, liquid must not be flowed out from the d mouth.When controlled vessel level drops to the end face of opening well-bucket 9 when following, the opening well-bucket has produced gravity, make the pressure release of bacterium shape cover 1 run-off the straight by pull bar 10 pulling connecting rods 14, the slit appears in pressure release collar extension c, the forfeiture of counter balance pocket b internal pressure, the back-pressure balance is destroyed, and bowl-type diaphragm 6 is by the pipeline hydraulic brace, and big quantity of fluid therefrom heart passage flow direction outlet e makes this fluid level control valve be on state.Fluid infusion liquid level height to the container returns to predetermined state, the end face of opening well-bucket 9 is in below the overall liquid level of container, this moment only remaining own wt, connect stalk 14 by spring 13 jack-up, bacterium shape pressure release lid 1 reverts to erectility, pressure release collar extension c is closed, and enters the b of balance chamber at the assistance downforce liquid of return spring 5 through aperture a and makes it produce back-pressure bowl-type diaphragm 6 is pushed up back to close central passage, make this valve become closed condition.Hanging the upper-lower position of tube in container by the adjustment opening is controlled liquid level height.

Accompanying drawing 2 is for adopting plastics or metal bellows another embodiment as sealed mouth:

Replace bowl-type diaphragm 6 with huge ptfe plastic bellows 6a in this structure, all the other structural similarities, working principle is identical with last example, can select various stainless steel materials for use according to service condition, makes this valve can be applicable to high temperature and deep-etching occasion.When pipeline pressure is higher, can select for use metal bellows to add the structure of the way of tetrafluoroethylene pad as the sealed mouth place.

This valve does not have the directionality requirement when installing and using, as long as poppet valve lid handle is touched valve switch motion is arranged promptly, and the flexible use that helps installing is adopted ball float or opening well-bucket and other to trigger part and all can be started.

Compare with existing machinery formula fluid level control valve, structure of the present invention has the impact that volume is little, reliability is high, not changed by manifold pressure, simple in structure, the control position is advantage accurately, compare with various automatically controlled liquid level valves, this valve is not only with low cost but also do not need to add other energy, be the replacement of traditional ball-cock assembly for product, be easy to install and promote.

Claims

1, a kind of mechanical type automatic control of liquid level valve is by counter balance pocket, bowl-type diaphragm or bellows, upper valve body, valve body, bacterium shape pressure release valve gap, sealing gasket, opening hang tube and spring is formed down.It is characterized in that constituting counter balance pocket by the upper valve body and the bacterium shape pressure release valve gap of bowl-type diaphragm or bellows and conical ring, bacterium shape pressure release valve gap is a built-in type, the bowl-type diaphragm of counter balance pocket or have a side of end bellows to have the impulse aperture to link to each other with water intake, the top of bowl-type diaphragm or bellows promptly is a sealed mouth.