CN2180850Y - Membrane type fluid return-proof device - Google Patents

Abstract

The utility model relates to a film type fluid return stopping device, which relates to pipelines and containers which contain the mixed fluid of solid, liquid, and air. The utility model comprises a casing body (4), a screen plate (3), a cylinder-shaped soft film (5), an outlet (2) and an inlet (1). The utility model is characterized in that the screen plate (3) is fixed on the inlet (1); the cylinder-shaped soft film (5) is arranged and is parallel to a flow direction after the screen plate close; one end of the soft film is constrained with the inner wall of the casing body (4) along the periphery of the casing body in a seal shape, and the other end extends to the direction of the outlet (2). Because the return stopping device cuts fluid in a surface contact mode, the sealing effect of the utility model can not be damaged by solid media which exist in the fluid, and the passing resistance of the fluid is reduced correspondingly and simultaneously because an elastic restoring device not exists.

Description

Membrane type fluid return-proof device

The utility model relates to the backstop that adopts in the pipeline that contains solid in its fluid and the container.

Existing backstop adopts design model different and be flap valve that vertical relation is provided with as the cutout device with the flow direction.Flap valve is by the made with certain rigidity, and its seal area is an annular closed curve or the very narrow and small closed curved surface of annular.Flap valve resets and is generally promoted by elastic element.If there is solid dielectric, this wire, or very easily destroy, cause to lose efficacy near the contact seal of wire; The existence of residing position of flap valve and elastic reset device has also strengthened fluid and has passed through resistance.

Liquid matter envelope (as water seal-trap commonly used in the sewage pipe) can solve the sealing problem when having solid preferably, but Applicable scope is very little, and have positive and negative two characteristics to the resistance equivalence, and make the raising of non-return effect depend on the raising back pressure merely.

The purpose of this utility model is that a kind of fluid non-return device that is the parallel relation setting and is made up of the sealing cutout device with the face way of contact that flexible material is made with the flow direction that adopts will be provided.

The utility model comprises a housing that has entrance and exit, the gentle film of a web plate and a tubular.It is characterized in that web plate is fixed on the inlet, be provided with and flow to the gentle film of parallel tubular in the mouth.The cylinder that the gentle film of tubular is a both ends open, one end and inner walls along perimeter constraint, and the other end then stretches to outlet one side.For obtaining best face contact seal state, the disalignment of the gentle film of tubular to circumferential position, can partly or entirely be shaped on fold in advance.The material of film can be selected the latex that relative tolerance is arranged with the medium of required sealing for use, rubber plastic, fabric and various composite material, but must have flexible preferably.Flexibility also is subjected to the thickness of film and the influence of counterpart warp mutually, and flexibility is big more, and sealing effect is good more, and resistance is also little.The effect of web plate is to prevent tubular membrane upset, thus need to bear reverse working pressure, its aperture minimum value by the solid grain through determining.Maximum value is by the tensile breaking strength decision of film.The upset of film also can be by the control of other method, so web plate also can be cancelled, and the cancellation web plate is to being favourable by bigger solid dielectric.

Under the positive pressure effect, the cavity pressure of the gentle film of tubular is in deployed condition greater than chamber pressure outside, film, and the pipe medium is passed through; Do the time spent at backpressure, gentle film chamber pressure outside is greater than cavity pressure, and shrinkage will take place film, and with passageway shuts off, film will be pressed to web plate gradually in the shrinkage process, set up until complete disconnection state.The switching that this shows film only is decided by the pressure direction of system, and it is auxiliary to need not elastic element, and cracking pressure is very low.Be surface contact state between the face of shrinkage, can contain solid dielectric, and not influence sealability that functional reliability is higher.

Concrete structure of the present utility model is drawn by following embodiment and accompanying drawing thereof, wherein:

Fig. 1 is a kind of device for collecting rain water that this backstop is housed, and Fig. 2 is a sectional drawing of this device for collecting rain water, and wherein the gentle film (5) of tubular is shaped on fold in advance.

Fig. 3 is arranged on exemplifying embodiment on the suction side pipeline section of sewage pump with this backstop, and Fig. 4 has provided a kind of structure of web plate.

Below in conjunction with figure (2) and details and the working procedure of figure (4) detailed description according to the concrete device that the utility model proposes.

The inlet of this backstop (1) is in the bottom in Fig. 3, and outlet (2) is on top; It also comprises shell (4), and tubular softens, and piece number (6) refers to the fluid that contains solid in the pipe among film (5), web plate (3) Fig. 3.Fig. 4 then is the top view of web plate.

Fig. 3 shows that backstop is in opening state, and fluid just sucks via inlet (1), flows to outlet (2), and web plate this moment (3) can play the effect of the foreign material that filter excessive particle diameter; After sewage pump quits work, sewage will flow backwards under action of gravity, and the pressure that backstop outlet (2) is located raises, and this makes the tubular film (5) that softens rise to greater than its cavity pressure because of its chamber pressure outside on foot, and the generation shrinkage.The final result of shrinkage is to cause compressing mutually between face, and the solid matter that is not discharged from is enclosed in therebetween, and fluid passage is blocked fully, and the refluence phenomenon is stopped.In the process that forms shrinkage, face also can integrally be shifted to web plate, and be pressed on the web plate after the cutout except that radially polycondensation is arranged under the pressure that flows backwards promotes.Because the change of pressure direction, the tubular film (5) that softens will open fluid passage by opposite program development after sewage pump restarts.

Claims (2)

1, a kind of membrane type fluid non-return device comprises shell (4) web plate (3), and tubular soften film (5) and outlet (2) and inlet (1) is characterized in that enter the mouth (1) locates to be fixed with web plate (3); And then web plate (3) is to be the gentle film (5) of tubular that parallel relation is provided with the flow direction, and the inwall of one end and housing (4) is the constraint of sealing shape along periphery, and the other end stretches to outlet (2) one sides.

2, device according to claim 1 is characterized in that axially reaching on the circumferential position of the gentle film of tubular, can partly or entirely precast fold.

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