CN2276097Y - Liquid controlled ball cock - Google Patents

Abstract

The utility model discloses a liquid controlled float valve which can close reliably in the low pressure state. The lever of a mechanical float valve is designed to be a lateral rod and a vertical rod. The lateral rod and the vertical rod are connected through a circular arced rod member, and the lateral rod is provided with a slide plate provided with a support rod. A spring is arranged between the slide plate and a float ball. A top plate vertically supports a piston. The liquid controlled float valve provides additional acting force through the restoring force of the spring when the piston is closed, and the disadvantage that the closing is unreliable in the lower water pressure which is lower than 0.05 MPa. The utility model has the advantages of small size and no water leakage.

Description

A kind of pilot operated ball float valve

The utility model relates to a kind of pilot operated ball float valve.

Pilot operated ball float valve has the conventional machinery of replacement formula float valve, the trend of especially big specification mechanical type float valve gradually with the little characteristics of its volume.But closing of the numerous pilot operated ball float valves that occur on the market all is to utilize the pressure difference at valve body piston two ends to realize, this is because the pressure at piston two ends all results from the hydrodynamic pressure of liquid inlet pipe, so piston two ends pressure is identical, two ends by the piston different area produce different pressure, form pressure difference.Therefore when hydrodynamic pressure was very low, this pressure difference was often big inadequately as the active force of closure piston, so closing valve has effectively limited the application of this valve in some occasions.

The purpose of this utility model is to provide a kind of pilot operated ball float valve that still can reliably close under the state of 0.05MPa that is lower than at hydrodynamic pressure.

The purpose of this utility model mainly is to utilize to comprise that the mechanism of cylinder body, mechanical type float valve, slide plate, push rod, spring assembly realizes that its structure is similar with common pilot operated ball float valve, admission chamber is promptly arranged in the cylinder body, go out sap cavity, back pressure cavity.Side face of piston ring is long-pending not to be waited, the big piston end surface of area in back pressure cavity, the little piston end surface of area in admission chamber, mechanical type float valve and back pressure cavity connection.The lever of mechanical type float valve is made of cross bar and montant, connect by the smoothed curve rod member between cross bar and the montant, the montant below connects ball float, be with slidably slide plate on the cross bar, be with spring on the bar thick stick between slide plate and the ball float, be connected with the push rod that stretches into back pressure cavity on the slide plate, and push rod contacts with the interior piston of back pressure cavity vertically.

Can connect by spring between slide plate and the push rod, the two be become flexibly connect, slide plate is unlikely can not to move up and down with cross bar because of push rod is limited in the vertical, and it is sensitive that float valve is opened and closed.

Valve rod connects the piston that the small piston be positioned in the admission chamber and the big piston in the back pressure cavity constitute cylinder body, and valve rod has logical admission chamber of axial hole and back pressure cavity, and fluid is identical to the pressure of large and small piston when making back pressure cavity be in sealing.

Being shaped as of cylinder body is cylindric, an end face is provided with admission chamber, another end face central authorities are provided with back pressure cavity, middle cavity is for going out sap cavity, have liquid outlet opening on the end face of the cylinder body around back pressure cavity, because the area of liquid outlet opening can be provided with size easily on end face, so can shorten the radial length of whole cylinder body effectively.

The valve rod that stretches in the admission chamber passes the guide pin bushing that is arranged in the admission chamber, thus accurate positioning when having guaranteed that valve rod is closed, seal ring is easy damaged not, and the whole system sealing is reliable.

The utility model is compared with existing pilot operated ball float valve, it has still utilized the pressure difference at valve inner carrier two ends as closing function power, thereby reduced the volume of valve effectively, but it has increased a spring simultaneously between ball float and slide plate, meeting holddown spring when ball float rises, the restoring force of spring orders about slide plate and moves on one side to cylinder body, thereby make the push rod on the slide plate withstand piston, piston is except pressure difference like this, the restoring force that also has a spring is as the active force of closing, and additional spring restoring force is not influenced by the hydrodynamic pressure size, all the time exist, thereby the utility model as less than under the 0.05MPa state, still can rely on the spring externally applied forces to be closed effectively when hydrodynamic pressure is very low.In addition, the design of the utility model cylinder body can be dwindled axial length under the situation of guaranteeing the fluid output quantity, reduce the volume of device; Flexibly connect between slide plate and the push rod, lever is moved up and down flexibly, float valve is opened freely; The piston that is combined into by hollow valve stem can be simplified the structure in the cylinder body, and has omitted and be assemblied in the conduit that cylinder body is communicated with admission chamber and back pressure cavity outward in the past, when guaranteeing that simultaneously piston opens and closes, and accurate positioning.

Below implement and in conjunction with the accompanying drawings the utility model be further described by one.

Fig. 1 is the example structure schematic representation, its structure is such, cylinder body 1 is one cylindrical, one end has admission chamber 20, and admission chamber 20 has liquid entering hole to connect fluid line, and there is back pressure cavity 17 in other end central authorities, back pressure cavity 17 has port to connect float valve 10, offer liquid outlet 18 on the end face around the back pressure cavity 17, it is identical with the discharge area of admission chamber 20 that the gross area of liquid outlet 18 can be designed to, to guarantee liquid flux.The centre of cylinder body 1 is sap cavity 19, back pressure cavity 17 imports have big piston 8, periphery is a seal ring 7, the outlet of admission chamber has small piston 4, small piston 4 peripheries also have seal ring 5, connect into integral body by valve rod 5 between big piston 8 and the small piston 4, there is through hole 6 in the axial central authorities of valve rod, and through hole 6 connects the fluid in fluid in the back pressure cavity 17 and the admission chamber 20.The 11st, whippletree, the 16th, montant connects into whole lever as the mechanical type float valve by the circular arc rod member between cross bar 11 and the montant 16, and ball float 14 is arranged on the montant 16, ball float 14 limiting stopper 15 arranged up and down, can make whole device be applicable to different water levels by the position of adjusting limiting stopper 15.Be with slide plate 12 on the cross bar 11, between slide plate 12 and the ball float 14 spring 13 arranged, slide plate 12 has the position vertical with cross bar 11, and this position connects push rods 9 by spring 21, and push rod 9 stretches in the back pressure cavity 13 and vertically contacts with big piston 8.

The course of action of present embodiment is such: to be applied in the pond is example, during for the drawdown in the pond, ball float 14 is with drawdown, mechanical type float valve 10 is opened, this moment, spring 13 loosened, and the water that back pressure cavity is 17 li also flows out by float valve 10, to the active force disappearance of big piston 8, and admission chamber has the water promotion piston integral body of pressure to move to back pressure cavity 17 directions for 20 li, and pilot operated ball float valve is opening state.The water that the admission chamber that communicates with intake pipe is 20 li flows into the pond through going out sap cavity 19 from liquid outlet 18.

When the water level in the pond rose to certain position, ball float 14 was because of buoyancy function also rises, and at this moment, spring 13 is compressed, and spring force acts on slide plate 12, and slide plate 12 is moved to back pressure cavity 17.Because the effect of spring 21, push rod 9 can move in cylinder along Boring mill, thus with the active force of spring along Boring mill to passing to big piston 8.

When ball float 14 was elevated to certain position, mechanical type float valve 10 was closed.The hydraulic pressure that enters back pressure cavity 17 by the through hole in the valve rod 56 will raise rapidly, hydraulic pressure in equaling admission chamber 20, because big piston 8 areas are greater than the area of small piston 4, thereby produced pressure reduction, valve rod 5 drives the part integral body that links to each other and moves until the water outlet of closing admission chamber 20 to the intake pipe direction, and in addition, valve rod 5 is with guide pin bushing 2 for 20 li at admission chamber, it guarantees radially the immobilizing of motion of valve rod 5, makes piston throttle down accurately and effectively.The closing function power of this kind pilot operated ball float valve is actually the mechanicals efforts sum of pressure difference and spring generation, even therefore when the water pressure in the intake pipe drops to zero, the mechanicals efforts that spring produces is constant, guaranteed that piston closing function power is enough big, made pilot operated ball float valve also water-tight under low hydraulic pressure state.

Claims (5)

1, a kind of pilot operated ball float valve comprises cylinder body (1), mechanical type float valve (10), and slide plate (12), push rod (9), spring (13) is characterized in that:

The lever of mechanical type float valve (10) is made of cross bar (11) and montant (16), connect by the smoothed curve rod member between cross bar (11) and the montant (16), montant (16) below connects ball float (14), be with slidably slide plate (12) on the cross bar (11), be with spring (13) on the bar thick stick between slide plate (12) and the ball float (14), be connected with the push rod (9) that stretches into back of the body chamber (17) on the slide plate (12), and push rod (9) contacts with the interior piston (8) of back pressure cavity (17) vertically.

2, pilot operated ball float valve according to claim 1, its feature also is:

Can pass through spring (21) between slide plate (12) and the push rod (9) connects.

3, pilot operated ball float valve according to claim 1, its feature also is:

Valve rod (5) connection is positioned at the small piston (4) of admission chamber (20) lining and the big piston (8) of back pressure cavity (17) lining, and valve rod (5) has axial hole (6) to be communicated with admission chamber (20) and back pressure cavity (17).

4, pilot operated ball float valve according to claim 1, its feature also is:

Being shaped as of cylinder body (1) is cylindric, and an end face is provided with admission chamber (20), and another end face central authorities are provided with back pressure cavity (17), and middle cavity has liquid outlet opening (18) for going out sap cavity (19) on back pressure cavity (17) cylinder body end face on every side.

5, pilot operated ball float valve according to claim 1, its feature also is:

The valve rod (5) that stretches in the admission chamber (20) passes the guide pin bushing (2) that is arranged on admission chamber (20) lining.

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