CN2377289Y - Safety antifouling cut-off valve - Google Patents

Abstract

The utility model relates to a safety antifouling cut-off valve. The utility model can effectively prevent impure water from backwards flowing into municipal main pipelines in the municipal water supply process. The utility model is characterized in that the utility model is composed of two stages of check valves; a water drainage device (2) is arranged between the first stage check valve (1) and the secondary check valve (3); the water drainage device is also a valve, an inlet of the water drainage device is connected with a connecting opening of a check valve, and the connecting opening of a check valve is connected with a valve cavity; the water drainage device is provided with two water inlet channels and two water outlet channels; the upper end of a valve core is connected with the valve clack and a diaphragm; a valve cap on the diaphragm is connected with an inlet pipe cavity of the check valve through a high-pressure flexible pipe (4), and is communicated with an upper cavity of the diaphragm of the water drainage device. The utility model can effectively prevent the municipal water supply pipelines from backwards flowing, and can also overcome the generation of siphon backward flowing and the damage of the pipelines caused by negative pressure.

Description

The antifouling isolating valve, of safety type

The utility model relates to a kind of valve in the mechanical engineering, particularly discloses the antifouling isolating valve, of a kind of safety type.

In the municipal water supply process, the situation that impure water blows back into the municipal water supply trunk line happens occasionally, the reason that causes this phenomenon has a lot, for example the city takes place to have a power failure suddenly, municipal water supply stops suddenly, water supply line produces the vacuum siphon phenomenon, make the impure water in some arm, the building of newly building up often has building waste etc. in the water pipe and is back in the municipal water supply pipeline, second kind of situation is in the highrise building, if the pipe network of living water use and water for fire is to be communicated with, because the water in the fire main does not flow throughout the year, hazardous substancess such as many microorganisms have been grown in the water, if these not the water purification example flow in the living water use pipeline, will influence the water quality of citizen's living water use, the third situation, suburbs, general vegetable grower uses the municipal water supply irrigated farmland, when municipal administration is cut off the water, the peasant just takes out river-water irrigation with water pump, impure water blows back in the municipal water supply pipe so probably, flap valve of the general device of the anti-aqueous reflux of water supply line is just passable, but for the city municipal water supply, water quality relates to thousands upon thousands residents' drinking water hygiene major issue.Only install its safety of flap valve, reliable giving birth to inadequately, malfunctioning because the sealing of flap valve often easily takes place aqueous reflux, the malfunctioning refluence that also may produce impure water of check valve seal.

The purpose of this utility model is to disclose the antifouling isolating valve, of a kind of safety type, and it can solve the backward flow problem of urban water supply safely and reliably, prevents that impure water from corroding the municipal water supply trunk line.

The utility model is to realize like this, utilize flap valve can solve the function of refluence substantially, therefore feature of the present utility model is the flap valve that design is made up of secondary, between first order flap valve (1) and second level flap valve (3), water trap (2) is set, described water trap (2) also is a kind of valve, and the water inlet of valve is connected valve pocket tube wall interface and connects with two flap valve.Spool (11) is a step cylinder, be positioned at the valve body center, the cylinder top connects flap (7), be provided with barrier film (8) above the flap, barrier film and flap do not have the gap and are close together, barrier film is a rubber, the barrier film top is provided with valve gap (5), barrier film and valve cover chamber cavity are called film on the barrier film (6), also be provided with upper sealing panel (9) on the spool cylinder from top to bottom, middle separation pad (12) and lower seal mouth piston (13), upper sealing panel is threaded with the spool cylinder, middle separation pad is a rubber ring, be embedded in the spool cylinder groove, lower seal mouth piston and spool cylinder fuse, be provided with control spring (8) under the spool cylinder, guide rod (19), valve seat (20), control spring (8) is enclosed within on the guide rod, at the bottom of the last end in contact spool, the lower end seat is on valve seat, guide rod (19) the upper half interts in the pilot hole at the bottom of the spool, the lower end of the guide rod seat is in valve seat orifice, the valve body chamber forms barrier film cavity of resorption (10) between barrier film and upper sealing panel, the valve body chamber constitutes air inlet port (14) between upper sealing panel and middle separation pad, the valve body chamber constitutes drain (15) down between lower seal mouth and middle separation pad, be provided with passage between barrier film epicoele (6) and the first order check valve inlet chamber, can to be valve gap (5) upper end connect snout cavity to first order flap valve with high-pressure hose (4) to this passage outside valve body, also can be arranged in the water trap valve body body, the water inlet of water trap can be made as upper channel (6) and lower channel (17), upper channel is communicated with barrier film cavity of resorption (10), and lower channel is communicated with the lower seal mouth.The interface that the secondary flap valve connects water trap is provided with air inlet port.Operating principle of the present utility model is as follows, when normal water supply, cleaning living water exports to second level flap valve through safe water trap from first order flap valve, supply water to the user, at this moment, first order check valve inlet water under high pressure by passage for example high-pressure hose (4) enter the barrier film epicoele (6) of water trap, and barrier film cavity of resorption (10) communicates with first order flap valve outlet (second level check valve inlet), because there is an actual pressure reduction in it, the promotion spool moves down, water trap cuts out, and the working condition during normal water supply is seen accompanying drawing 3 and accompanying drawing 4.If inlet pressure remains unchanged in the water supply process, there is pressure reduction before and after it, water trap still is closed condition, if inlet pressure descends, pressure reduction drops to one when in fact being worth before and after it, and control spring promotes spool upwards, and water trap is opened pressure release, draining is to recovering one in fact during pressure difference with inlet pressure, and water trap cuts out again.When check valve seal is malfunctioning, if ductwork pressure raises after the antifouling isolating valve, of safety type, when surpassing before the valve inlet pressure, if the intact leakproof of second check valve seal, water under high pressure can not flow backwards, and the water trap barrier film keeps original pressure reduction up and down, water trap cuts out, not pressure release.When second level check valve seal is destroyed the generation seepage, pressure raises before the flap valve of the second level, pressure reduction reduces about causing the water trap barrier film, water trap is opened, the draining pressure release, at this moment, if first order flap valve is seal break-off simultaneously, since the water under high pressure that second level flap valve flows backwards pressure release decompression, the first order flap valve that can not flow backwards back, the effect of not polluting municipal trunk line clean water up to user side's water.If the water supply process pressure of supply water constantly descends, then water trap barrier film upper pressure descends, the water trap control spring promotes spool and opens the water trap draining, when inlet pressure drops to zero or negative pressure, water trap is opened fully, water is discharged, air from water trap air inlet port (14), go up seal, barrier film cavity of resorption (10) is connected the vacuum chamber that valve pocket enters the former side of one-level flap valve with upper channel (16) to flap valve, thereby prevent to produce siphon refluence phenomenon and pipeline causes damage (seeing accompanying drawing 4) because of negative pressure.

Represent the utility model structure and operative scenario with accompanying drawing.

1 one kinds of utility model elevations of accompanying drawing.

Accompanying drawing 2 one sharp utility model lateral views.

3 one kinds of utility model municipal administrations of accompanying drawing normal water supply working condition diagram.

Accompanying drawing 4 is the A-A cross section water trap arrangement works condition diagram of Fig. 3.

5 one kinds of utility models of accompanying drawing seal break down working condition diagram of malfunctioning water supply.

Accompanying drawing 6 cuts water trap arrangement works condition diagram for the A-A of Fig. 5.

Accompanying drawing 7 is the water trap structure chart.

Piece mark in the accompanying drawing 1: (1) first order flap valve, (2) water trap, (3) second level flap valve, (4) high-pressure hose in the accompanying drawing 3, (4) high-pressure hose in the accompanying drawing 7, (5) valve gap, (6) barrier film epicoele, (7) flap, (8) barrier film, (9) upper sealing panel, (10) barrier film cavity of resorption, (11) spool, (12) separation pad in, (13) lower seal mouth piston, (14) air inlet port, (15) drain under, (16) upper channel, (17) lower channel, (18) control spring, (19) guide rod, (20) valve seat.

Embodiment: with reference to the accompanying drawings 1 and 2; be connected with second level flap valve (3) at first order flap valve (11) water trap (2) is set on the vertical cross-section of valve pocket stage casing; water trap barrier film epicoele uses high-pressure hose (4) external to check valve inlet chamber wall from valve body with the employing that is communicated with between the first order check valve inlet chamber on water trap valve gap top; the import and export caliber of flap valve is selected d 〉=100mm; other structures are above stated; repeated description not; characteristics of the present utility model are that water trap is provided with two seals up and down; one is called air inlet port (14); one is called drain (15) down; the centre has dottle pin that the exhalant canal of two seals is separated; flap valve is malfunctioning when the second level; and the refluence amount hour; only open seal; impure water just can be discharged; hydraulic pressure is by last seal pressure release in the water trap; when the refluence amount is big; last seal safety is opened; this moment, the lower seal mouth was also opened; can increase displacement; when first order flap valve malfunctioning; and when vacuum occurring; can be from the impure water that second level flap valve flows into from drain discharge down; and air can enter first order flap valve from air inlet port (14), destroys vacuum, and because the setting of middle separation pad; make the vacuum chamber that can not blow back into first order flap valve from the impure water of drain outflow down, the cleaning of protection water supply trunk line with air.

The utility model can not only solve the problem of refluence fully, and all action can both be finished automatically, even inlet pressure drops to zero or when vacuum occurring, air also can enter vacuum chamber from water trap, thereby can prevent the damage that siphonage and pipeline cause because of negative pressure.

Claims (5)

1. one kind is the antifouling isolating valve, of safety type that assembly constitutes by flap valve, it is characterized in that forming by the secondary flap valve, between first order flap valve (1) and second level flap valve (3), a water trap (2) is set, described water trap (2) also is a kind of valve, being connected the valve pocket interface between the water inlet of valve and two flap valve connects, spool (11) is a step cylinder, be positioned at the valve body center, the cylinder top connects flap (7), be provided with barrier film (8) above the flap, barrier film and flap do not have the gap and are close together, the barrier film top is provided with valve gap (5), barrier film and valve cover chamber cavity are called barrier film epicoele (6), also be provided with upper sealing panel (9) on the spool cylinder from top to bottom, middle separation pad (12) and lower seal mouth piston (13), upper sealing panel (9) is threaded with the spool cylinder, middle separation pad is a rubber ring, be embedded in the spool cylinder groove, lower seal mouth piston and valve core fuse, be provided with control spring (18) under the spool cylinder, guide rod (19), valve seat (20), control spring (18) is enclosed within on the guide rod (19), at the bottom of the last end in contact spool, the lower end seat is on valve seat, guide rod (19) the upper half interts in the pilot hole at the bottom of the spool, the lower end of the guide rod seat is in valve seat orifice, the valve body chamber forms barrier film cavity of resorption (10) between barrier film and upper sealing panel, the valve body chamber constitutes air inlet port (14) between upper sealing panel and middle separation pad, the valve body chamber constitutes drain (5) down between lower seal mouth and middle separation pad, is provided with passage between barrier film epicoele (6) and the first order check valve inlet chamber.

2. the antifouling isolating valve, of safety type according to claim 1 is characterized in that the passage between described barrier film epicoele and the first order check valve inlet chamber can be that valve gap (5) upper end connects to first order check valve inlet chamber with high-pressure hose (4) outside valve body.

3. the antifouling isolating valve, of safety type according to claim 1 is characterized in that the passage between described barrier film epicoele and the first order check valve inlet chamber can also be arranged in the water trap valve body body.

4. the antifouling isolating valve, of safety type according to claim 1 is characterized in that described water trap water inlet can be made as upper channel (16) and lower channel (17), and upper channel is communicated with barrier film cavity of resorption (10), and lower channel is communicated with the lower seal mouth.

5. according to claim 1 or the antifouling isolating valve, of 4 described safety types, it is characterized in that the interface of secondary flap valve connection water trap is provided with air inlet port.

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