CN101776167A

CN101776167A - Check valve

Info

Publication number: CN101776167A
Application number: CN 201010117272
Authority: CN
Inventors: 夏育红
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-03-03
Filing date: 2010-03-03
Publication date: 2010-07-14
Anticipated expiration: 2030-03-03
Also published as: CN101776167B

Abstract

The invention relates to a check valve which comprises a valve rod and a valve body, wherein the valve body is provided with an input interface and an output interface; the valve rod is a hollow cylinder the bottom end of which is closed and the upper end of which is provided with an opening; through holes are arranged on the valve rod; a rubber sleeve is positioned between the valve rod and the valve body; the inner edge of the rubber sleeve is fixed at the outer side of the valve rod, and the outer edge thereof is fixed on the wall of an inner cavity of the valve body; and a limit mesh plate is arranged under the valve rod; and the periphery of the limit mesh plate is fixedly connected with the wall of the inner cavity of the valve body. The check valve effectively overcomes the influence of water hammer, and has high forward flow rate, low flow resistance, excellent sealing performance as well as stable and reliable work.

Description

A kind of safety check

Technical field

The present invention relates to a kind of valve, specifically is the safety check that can effectively prevent impact of water hammer, also claims one-way valve.

Background technique

At present, its non-return structure of all both at home and abroad safety check all is the mode that adopts the stifled valve port of lid, and gravity sag formula and damping slow enclosed are wherein arranged.So-called gravity sag formula comprises rotary-open type, this is a kind of the most frequently used safety check, its defective: when hydrodynamic pressure disappears, its flap " wafts " in fluid, the resistance that the moving fluid of flap " fan " need overcome when the showy power of flap and closure has caused the closure of flap to delay, the time that this closure delays much larger than time that water hammer produced, just flap is not also closed, water pipe flows backwards and takes place, and be acceleration situation, and at this moment still rely on the opposite force that is produced that flows backwards just the valve hole thoroughly to be closed, and the inertia of circulating water is very big, thereby forms the water density sharp increase of big water hammer and water hammer lower end, potential energy develops into the backpressure ripple, and makes water hammer be the concussion of decay property, and then cause the flap magaseism, make its lost of life.The damping slow enclosed is in water hammer takes place mid-term in addition, and it is bigger that valve flap surface bears water hammer power.Above-mentioned drawbacks limit of the prior art the application of these valves in the high pressure non-return.

Summary of the invention

At above-mentioned problems of the prior art, the invention provides a kind of safety check, it is little that this valve has the forward flow resistance, and oppositely sealability is good, and aperture is regulated automatically, and the automatic Slow Close of forward and anti-wear can effectively be avoided the generation of water hammer.

The technological scheme that the present invention is taked for its purpose of realization: a kind of safety check, comprise valve rod and valve body, establish input interface and output interface on the valve body.Described valve rod is a hollow circular cylinder, and its bottom is airtight, and upper end open is laid through hole on the valve rod, establish gum cover between valve rod and valve body; The interior edge of described gum cover is fixed on the valve rod outside, and the outer of gum cover is fixed on the body cavity wall, and valve rod and gum cover constitute the non-return sealed valve core.A mesh plate of limiting below valve rod, spacing mesh plate periphery is affixed with the body cavity wall.The outer of described gum cover is fixed on the body cavity wall by limited ring.Described through hole is single, and is double or arrange more and put, and shape of through holes is rectangular, rhombus, ellipse or circular.It is little and reverse sealability is good that this structure of the present invention has guaranteed that this valve has the forward flow resistance, and aperture is regulated automatically: automatic Slow Close of forward and abrasionproof undermine anti-solid particle, the characteristics of effectively avoiding water hammer to produce.

Beneficial effect of the present invention:

(1) sealability is good, and its non-return sealed valve core is not subjected to the influence of output terminal high pressure and water hammer, and it is very stable to work, and is reliable.

(2) so valve opening and closing frictional force is minimum durable, and the life-span is long.

(3) the forward flow resistance is little, and its valve opening increases with the increase of incoming pressure and input quantity, otherwise then reduces.

(4) since the valve closing time point be in input press be a bit larger tham and near output press time point, so effectively prevented the generation of water hammer.

(5) this safety check aperture of door adds up to output quantity big, so the forward flow is big, flow resistance is little.

(6) manufacturing of this safety check is simple, and technological requirement is low, and is with low cost.

Description of drawings

The present invention is described in more detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is a structure cross-sectional schematic of the present invention.

1. output interfaces among the figure, 2. valve rod, 3. through hole, 4. spacing mesh, 5. input interface, 6, spacing mesh plate, 7, gum cover, 8, valve body, 9, limited ring.

Specific implementation process

Fig. 1 is a structure cross-sectional schematic of the present invention, its expression valve rod and gum cover location status in valve body when incoming pressure and delivery pressure tend to balance.The present invention includes valve rod 2 and valve body 8, establish input interface 5 and output interface 1 on the valve body 8.Valve rod 2 is a hollow circular cylinder, and its bottom is airtight, upper end open.Lay through hole 3 on the valve rod 2.Through hole can be designed to rectangular, rhombus, ellipse or circular, is evenly arranged on the valve rod 2, can establish single, double or many rows.Between valve rod 2 and valve body 8, establish gum cover 7; The interior edge of gum cover 7 is fixed on valve rod 2 outsides, and the outer of gum cover 7 is fixed on valve body 8 inwalls by limited ring 9.Valve rod 2 and gum cover 7 constitute the non-return sealed valve core.The mesh plate 6 of limiting below valve rod 2 is arranged on it and is evenly arranged spacing mesh 4.Spacing mesh plate 6 peripheries are affixed with valve body 8 inwalls.

During when the fluid pressure input increase and greater than output fluid pressure, fluid flows through spacing mesh plate 6, simultaneously valve rod 2 sealed ends and valve gum cover 7 are exerted pressure, valve rod 2 moves to output interface 1 direction, thereby pulling gum cover 7, this moment, gum cover 7 tensions stretched, and were subjected to pushing away of hydrodynamic pressure bloated simultaneously, gum cover 7 covers sealing surface on the valve rod and is pushed open by fluid and make gum cover 7 and valve rod 2 draw back, and opens through hole 3.It is big more that forward is exported its input quantity, and then the degree of drawing back of gum cover 7 is big more, and the output quantity of through hole 3 increases.

Then the aperture of valve gum cover also reduces thereupon when the output pressure reduces, and when the input crimping was bordering on the output pressure, through hole 3 was closed.Since the through hole internal and external pressure balance, be not subjected to the influence of delivery pressure, so gum cover 7 can be high pressure resistant, water-fast hammer impacting with high pressure.The non-return sealing force of gum cover 7 is mainly the hydrodynamic pressure of self elastic force and output cavity, so its sealing when even the hydraulic pressure of output cavity is zero, also can keep excellent sealing ability.

Keep higher state because of delivery pressure when incoming pressure continues to reduce again, and then oppositely exert pressure valve rod (2) and the gum cover 7 of exerting pressure simultaneously closely contact and cover spacing mesh plate 6, because spacing mesh plate (6) limits, the safety check sealing can't reflux.

The automatic Slow Close performance of forward that the peculiar balance of the present invention becomes zero has effectively prevented the generation of water hammer.Belong to soft elastic packing owing to flap simultaneously, and the flap in the valve hole, internal and external pressure balance, " spool " is stressed to be zero, so water-fast hammering blow.It is good that the present invention has the little reverse sealability of forward flow resistance, and aperture is regulated automatically: the automatic Slow Close of forward and anti-wear, anti-solid particle can effectively be avoided the generation of water hammer.

Claims

1. safety check, comprise valve rod (2) and valve body (8), establish input interface (5) and output interface (1) on the valve body (8), it is characterized in that described valve rod (2) is a hollow circular cylinder, its bottom is airtight, upper end open, valve rod (2) go up lays through hole (3), establishes gum cover (7) between valve rod (2) and valve body (8); The interior edge of described gum cover (7) is fixed on valve rod (2) outside, and the outer of gum cover (7) is fixed on valve body (8) internal chamber wall; The mesh plate (6) of limiting in described valve rod (2) below, spacing mesh plate (6) periphery is affixed with valve body (8) internal chamber wall.

2. safety check according to claim 1 is characterized in that the outer of described gum cover (7) is fixed on valve body (8) internal chamber wall by limited ring (9).

3. safety check according to claim 1 is characterized in that described through hole is single, and is double or arrange more and put, and shape of through holes is rectangular, rhombus, ellipse or circular.