CN2257583Y - Self-pressure close-assisted float valve - Google Patents

Abstract

The utility model discloses a self-pressure close-assisted float valve, which comprises a valve body, a valve core, a valve rod, a floating ball and a connecting lever for the floating ball. The connecting lever fixedly connected with the floating ball is movably connected with the valve rod and the valve body, a piston is arranged on the valve rod fixedly connected with the valve core, and the maximum cross-sectional areas of the piston and the valve core are equal or similar. A hole throughout the valve core, the valve rod and the piston is arranged along the axial direction of the valve rod, and the pressure acted on the valve core by the high liquid level in a tube is effectively counteracted by the liquid pressure generated in a cylinder composed of the piston, the valve body and a bottom closing flange. The utility model has the advantages of reasonable structure, large flow of liquid drainage, effective regulation of flow, convenient installation and low cost.

Description

Help from pressure and to close float valve

The utility model relates to a kind of liquid valve technology, and particularly a kind of helping from pressure closed float valve.

Float valve is a kind of special valve that is exclusively used in the control liquid level, existing float valve technological scheme form is different, but great majority are to utilize buoyancy that ball float produces to change into pressure by the transmission that connects lever to seal valve port from outside to inside or from inside to outside and overcome external fluid pressure to block feed liquor, shutoff liquid stream, but at heavy caliber, under the situations such as high hydraulic pressure and actual internal area are constant, still exist the closure or openness difficulty, bad sealing, defectives such as easy leakage, and the method for desiring to overcome these defectives is generally and increases the ball float volume to increase buoyancy, the deadweight that increases ball float is to increase pressure, lengthening connects the size of lever to increase moment, limited by working condition but the ball float volume can occur increasing and increase length of connecting rod thereupon, open and close poor performance, fragile, problems such as difficult maintenance.Also once the someone proposes in valve to be provided with such as the spring-like mechanical device and comes solving the technological scheme of liquid level control problem under high hydraulic pressure, the heavy caliber situation, but when hydraulic pressure is lower than certain certain value, the problem of difficulty then still can appear opening and closing, and general complex structure all, the rapid wear difficulty is repaiied, cost is higher.More than all kinds of the technological schemes decompression and the pressure-less boiler water liquid level that all are difficult to satisfactorily resolve such as (surpassing) tall building water control this class practical problem.

The purpose of this utility model is intended to design and a kind ofly can overcomes external high liquid level pressure automatically, and simple in structure, install that maintenance is convenient, suitable application area closes float valve from pressing to help widely.

The purpose of this utility model realizes by following manner: press certainly to help and close float valve and comprise valve body, spool, valve rod, ball float and connection lever thereof, the connection lever of affixed ball float is connected with valve handle activity, connecting lever and valve body flexibly connects, the valve rod of spool of being connected is provided with piston, and the hole that axially has perforation spool, valve rod and a piston along valve rod, valve body is provided with guiding device, and the maximum cross-section area of piston equates with the maximum cross-section area of spool or be close.

The utility model is compared with the prior art scheme, have simple and reasonable, borrow self structure effectively offset high liquid level pressure in the pipe, draining flow is big and can regulate automatically that flow, installation overhaul conveniently, low cost and other advantages, be widely used in various liquid valves, especially high liquid level liquid valve.

Now the utility model is described in further detail for a specific embodiment shown in conjunction with the accompanying drawings.

Accompanying drawing 1. structural representations of the present utility model

Accompanying drawing 2. the utility model structure stresses are analyzed schematic representation

As shown in Figure 1, help from pressure that to close float valve in aggregates by nut, bolton by back cover flange 1, valve body 14 and pipe connecting flange 7, the interface of flange 7 is an infusion port 8, opening on the valve body 14 is a liquid port 12, valve body 14 is provided with hanger 6, hanger 6 is hinged with an end of connecting rod 5, hinged with valve rod 13 and to run through an end that is connected lever 18 and the connecting rod 5 of valve body liquid port 12 hinged, its the other end is fixed in ball float 17, and ball float 17 is in the outer liquid-container of valve body does the upper and lower displacement campaign with liquid level change drive valve rod 13.The upper end of valve rod 13 and spool 11 are affixed by screw thread, and the end face of spool 11 is provided with groove to put sealing gasket 10, by pressing plate 9 and bolt sealing gasket 10 is anchored on the spool 11 again, and valve rod 13 lower ends are provided with piston 15.Piston 15 is provided with groove to put seal ring 3, and wherein the maximum cross-section area of piston 15 equates with the maximum cross-section area of spool 11.Have a through hole 16 that connects spool 11, valve rod 13 and piston 15 along the axial direction of valve rod 13, between piston 15, valve body 14 and back cover flange 1, form a cylinder body that only communicates with adapter liquid by hole 16.14 of valve bodies also are provided with radially the lining 4 that distributes, to guarantee that valve rod 13 is at liquid in pipe pressure or connect vertically evenly running freely under the effect that lever 18 transmits the power of coming.

So it can effectively offset the influence that high liquid level pressure produces valve in the pipe the utility model, mainly be because by piston 15, in valve body 14 and the back cover flange 1 formed cylinder body, the power that acts on piston 15 surfaces becomes a kind of to acting on the resistance of fluid pressure on spool 11 end faces, water level till when being in position shown in the accompanying drawing 1 to connect lever 18, be that the situation that valve is in closed condition is an example, this moment spool 11, piston 15, the stress of ball float 17 members such as grade as shown in Figure 2, for the pressure P that forms at building bottom piping valve port such as the contour liquid level water storage box of tall building to spool 11 ₁And act on piston 15 surface in the cylinder body and go up hydraulic coupling P ₂, because building height H compares with the height h of valve body, h can ignore, the maximum cross-section area owing to piston 15 is designed to equate with the maximum cross-section area of spool 11 again, then P in theory ₁With P ₂Be two active forces that numerical value equates, direction is opposite, so as long as material selection is appropriate, the good seal performance of manufacturing process standard, cylinder body, no matter the high liquid level pressure that then comes from the pipe is much, all will be offseted or a large amount of pins subtracts by the reaction force that structure of the present utility model self produces, and the effect of ball float 17 at this moment only just changes along with the height of liquid level in the container, according to its suffered buoyancy F ₁Perhaps self gravitation F ₂Be delivered on the spool 11 by connecting lever 18, work the closure or openness that help spool 11, the perhaps effect of airtight valve port.As mentioned above, the volume of ball float 17 and deadweight, the length etc. that is connected lever 18 all can design outfit routinely, and the water outlet latus rectum can design more much biggerly than existing technology, even can be equal to or greater than the water intake latus rectum, then solved problems such as the prior art draining flow is restricted, discharge opeing is not smooth; And because structure described in the utility model is highly resistant to external high liquid level pressure, the motion up or down of spool 11 is not to open or close suddenly valve port suddenly because of the power effect that suddenlyd change, spool 11 is running when ball float 17 is done lifting with the linear variation of liquid level and thereupon, then the amount of infusion of valve also can even variation, so can reach the effect of regulating flow, and can avoid the mechanical deterioration of spool 11 end faces effectively.

Claims (3)

1. oneself pressure helps and closes float valve, comprise valve body (4), spool (11), valve rod (13), ball float (17) and connect lever (18), the connection lever (18) of affixed ball float (17) flexibly connects with valve rod (13), connecting lever (18) flexibly connects with valve body (14), the valve rod (13) that it is characterized in that building admittedly spool (11) is provided with piston (15), and axially has the hole (16) of perforation spool (11), valve rod (13) and a piston (15) along valve rod (13).

2. according to claim 1ly closes float valve from pressing to help, the maximum cross-section area that it is characterized in that described piston (15) equates with the maximum cross-section area of spool (11) or is close.

3. close float valve according to claim 1 and described the helping of claim 2, it is characterized in that described valve body (14) is provided with guiding device (4) from pressure.

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