CN201416675Y

CN201416675Y - Valve core of check valve

Info

Publication number: CN201416675Y
Application number: CN2009201200033U
Authority: CN
Inventors: 林海林
Original assignee: TAIZHOU DOUBLE-LIN VALVES MANUFACTURING Co Ltd
Current assignee: Zhejiang Double-Lin Valves Co., Ltd.
Priority date: 2009-05-12
Filing date: 2009-05-12
Publication date: 2010-03-03
Anticipated expiration: 2019-05-12

Abstract

The utility model provides a valve core of a check valve, which belongs to the technical field of valves and solves the problem that the sealing piece of the valve core of the traditional check valveis fixed through nuts and the nuts are easy to drop off upon long-term impact of medium circulation. The valve core of the check valve comprises a guide rod, wherein a valve plate and a baffle sheet located on one side of the valve plate are fixedly connected on the guide rod; the baffle sheet, the valve plate and the guide rod are integrated; and the sealing piece formed by injection molding is mounted between the baffle sheet and the valve plate. The valve core of the check valve has the advantages that the baffle sheet, the valve plate and the guide rod are integrated and the sealing piecein the valve core is formed by injection molding, so as to achieve convenient manufacture, low manufacturing cost and high fastness; the sealing piece is made of nitrile rubber material, so as to improve the leak tightness and service life of the valve core; and supporting pieces fixedly connected on the guide rod are arranged in the sealing piece, so as to achieve higher fastness of the sealing piece and prevent the sealing piece from deformation.

Description

The spool of safety check

Technical field

The utility model belongs to valve technology field, relates to the spool of a kind of safety check, particularly a kind of safety check.

Background technique

Common valve only has unlatching, closes the function of fluid flow, wants to make fluid to flow backwards, and a safety check must be set match with it.Traditional safety check generally is fixed together with pipeline by being threaded and forms a complete safety check, must carry out screw thread processing to connecting tube when mounted, thereby reduce working efficiency.

At present, safety check is generally the piston lifting structure that Returnning spring is housed.For example, Chinese patent literature once disclosed a kind of safety check [patent No.: ZL97210879.3; Notice of authorization number: CN2292197Y], constitute by valve body and spool, the fluorine rubber pad on the spool has radian by outer surface and inner fluorine rubber gland with screw thread is fixed on the spool axis of guide.From as can be known above-mentioned, fluorine rubber pad on the spool is fixed on the spool axis of guide by nut to be realized fixingly, and the means of fixation of this structure has certain soundness, but spool has been produced very strong impact force during the medium circulation, spring fatiguability and damaging, and have certain pressure loss.Simultaneously, because the long-term impact of medium circulation, nut is loosening easily or drop, cause spool occur sealing closely or fluorine rubber situation such as sluff take place, make that safety check can't proper functioning.

Summary of the invention

The purpose of this utility model is to have the problems referred to above at existing technology, and having proposed a kind of catch and guide rod is integral structure, the spool of the safety check that the Sealing fastness is high.

The purpose of this utility model can realize by following technical proposal: a kind of spool of safety check, comprise guide rod, it is characterized in that, be fixed with valve plate and the catch that is positioned at valve plate one side on the described guide rod, described catch, valve plate, guide rod are integral structure, be provided with Sealing between valve plate and catch, the sealing part adopts molding and forming.

The spool of this safety check is installed in the valve body of safety check, valve body comprises bonnet and bottom flange, bonnet in a tubular form and the exhalant canal that has valve pocket and be connected with valve pocket, bottom flange is fixed on the bonnet by being threaded, and has intake tunnel on the bottom flange and this intake tunnel is connected with valve pocket.All have a pilot hole on bottom flange and the bonnet, guide rod is located on the pilot hole.Sealing is between two pilot holes, and spring is located on the guide rod and two ends are resisted against respectively on the pilot hole on Sealing and the bonnet.Has the protruding circle of annular taper at the inner port place of intake tunnel, the end face of the protruding circle of this taper can form sealing with the Sealing of spool, under off working state, Sealing is in sealing state all the time under the effect of spring, when in running order, guide rod slides and pressure spring along pilot hole, and the end face of the protruding circle of taper this moment separates to supply water with the Sealing of spool and passes through.Catch in this programme has replaced nut of the prior art, and is integral structure between this catch and valve plate and the guide rod, thereby has stopped the phenomenon generation that catch drops and causes Sealing to drop completely.Sealing in this spool adopts molding and forming, also improved Sealing and has been fixed in fastness on the guide rod.

In the spool of above-mentioned safety check, the diameter of all rounded and catch of described catch and valve plate is less than the diameter of valve plate, and the one side of Sealing is resisted against on the bottom surface of valve plate, and another side is resisted against on the catch.

In the spool of above-mentioned safety check, the equal diameters of described Sealing rounded and its diameter and valve plate.Catch is to be used to prevent that Sealing from dropping, and hides sealing surface for fear of catch, so the diameter of this catch is less than the diameter of valve plate, also less than the diameter of the protruding circle of annular taper.

In the spool of above-mentioned safety check, has spring seat on the end face of described valve plate.Spring seat is set in order to improve the soundness of spring action on valve plate, avoids causing the imprecise situation of spool hydrodynamic reciprocating sealing to take place because of the spring slip produces discontinuity.

In the spool of above-mentioned safety check, described Sealing adopts the nitrile rubber material to make.Nitrile butadiene rubber mainly adopts the production of low temperature emulsion polymerization, and it is higher to have wear resistance, plasticity and have certain elasticity, thus made things convenient for the production and the manufacturing of this spool, the sealing and the working life of also having improved this spool simultaneously.

In the spool of above-mentioned safety check, be provided with support plate in the described Sealing, support plate is connected on the guide rod.For further optimizing design scheme, improve the fastness of Sealing and can prevent the distortion of Sealing, so support plate is set in Sealing.

In the spool of above-mentioned safety check, described support plate is provided with several through holes.In injection moulding process, can inject rubber in this through hole, make that the rubber connection area of support plate both sides is bigger, thereby effectively raise the fastness of Sealing.

Compared with prior art, the catch in the spool of this safety check, valve plate, guide rod are that the Sealing in integral structure and the spool adopts molding and forming, thus have easily manufactured, the advantage that cost of production is low, soundness is high.The sealing part adopts the nitrile rubber material to make, and has improved the sealing and the working life of this spool.The support plate be connected on the guide rod is set in Sealing, and it is higher and prevent the advantage of the distortion of Sealing to have a fastness that can make Sealing.

Description of drawings

Fig. 1 is this safety check sectional structure schematic representation.

Fig. 2 is the sectional structure schematic representation of first kind of scheme of the spool of this safety check.

Fig. 3 is the sectional structure schematic representation of second kind of scheme of the spool of this safety check.

Fig. 4 is the sectional structure schematic representation of the third scheme of the spool of this safety check.

Among the figure, 1, valve body; 2, bonnet; 3, bottom flange; 31, the protruding circle of taper; 32, annular groove; 4, pilot hole; 5, spring; 6, spool; 61, guide rod; 62, valve plate; 63, catch; 64, spring seat; 65, Sealing; 66, support plate; 67, through hole; 7, filter screen; 71, filter opening; 8, bottom.

Embodiment

Below be specific embodiment of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.

As shown in Figure 1, this safety check comprises valve body 1, spool 6, spring 5.Valve body 1 comprises bonnet 2 and bottom flange 3, bonnet 2 in a tubular form and the exhalant canal that has valve pocket and be connected with valve pocket, bottom flange 3 is fixed on by being threaded on the bonnet 2, has intake tunnel on the bottom flange 3 and this intake tunnel is connected with valve pocket.Spool 6 and being arranged in the valve pocket of bonnet 2, spool 6 comprises guide rod 61 and the Sealing 65 that is fixed on the guide rod 61, all has a pilot hole 4 on bottom flange 3 and the bonnet 2, guide rod 61 is located on the pilot hole 4, Sealing 65 is between two pilot holes 4, and spring 5 is located on the guide rod 61 and two ends are resisted against respectively on the pilot hole 4 on Sealing 65 and the bonnet 2.Has the protruding circle 31 of annular taper at the inner port place of intake tunnel, the end face of the protruding circle 31 of this taper can form sealing with the Sealing 65 of spool 6, under off working state, Sealing 65 is in sealing state all the time under the effect of spring 5, when in running order, guide rod 61 slides and pressure springs 5 along pilot hole 4, and the end face of the protruding circle 31 of taper this moment separates to supply water with the Sealing 65 of spool 6 and passes through.

Intake tunnel external port place at bottom flange 3 is provided with annular groove 32, filter screen 7 is tubular and its a end embeds in the annular groove 32, filter screen 7 is fixed on by glue on the annular groove 32 of bottom flange 3, the bottom 8 of the other end of filter screen 7 by being welded with its end face of shutoff.Parallel and inner chamber filter screen 7 of a core of axle core and the intake tunnel of filter screen 7 communicates with intake tunnel.Filter screen 7 adopts copper product to make, and its filter opening 71 is rounded, makes filter screen 7 neither yielding, can not influence inflow again.

Embodiment one

As shown in Figure 2, the spool 6 of this safety check, comprise guide rod 61, be fixed with valve plate 62 that is connected as a single entity and the catch 63 that is positioned at valve plate 62 1 sides on the guide rod 61, valve plate 62 and catch 63 axially are provided with and are parallel to each other along guide rod 61, and the diameter of all rounded and catch 63 of catch 63 and valve plate 62 is less than the diameter of valve plate 62.Be provided with Sealing 65 between valve plate 62 and catch 63, sealing part 65 adopts the nitrile rubber material to make.Sealing 65 adopts molding and forming, 65 one-tenth annulus of Sealing after the moulding are tabular, and the one side of Sealing 65 is resisted against on the bottom surface of valve plate 62, and another side is resisted against on the catch 63, hide sealing surface for fear of catch 63, so the diameter of this catch 63 is less than the diameter of the protruding circle 31 of annular taper.

Act on soundness on the valve plate 62 in order to improve spring 5, avoid producing discontinuity and causing the imprecise situation of spool 6 hydrodynamic reciprocating sealings to take place, on the end face of valve plate 62, be provided with spring seat 64 because of spring 5 slides.

Embodiment two

As shown in Figure 3, present embodiment is basic identical with embodiment one structure and principle, different place is: for fastness that improves Sealing 65 and the distortion that can prevent Sealing 65, so in Sealing 65, be provided with the support plate 66 of sheet, support plate 66 is connected on the guide rod 61, and support plate 66 is connected as a single entity with guide rod 61.

Embodiment three

As shown in Figure 4, present embodiment is basic identical with embodiment two structure and principle, and different place is: be provided with several through holes 67 on support plate 66.In injection moulding process, can inject rubber in this through hole 67, make that the rubber connection area of support plate 66 both sides is bigger, thereby effectively raise the fastness of Sealing 65.

Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Although this paper has used valve body 1 morely; Bonnet 2; Bottom flange 3; The protruding circle 31 of taper; Annular groove 32; Pilot hole 4; Spring 5; Spool 6; Guide rod 61; Valve plate 62; Catch 63; Spring seat 64; Sealing 65; Support plate 66; Through hole 67; Filter screen 7; Filter opening 71; Bottom 8 terms such as grade, but do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain essence of the present utility model more easily; They are construed to any additional restriction all is contrary with the utility model spirit.

Claims

1, a kind of spool of safety check, comprise guide rod (61), it is characterized in that, be fixed with valve plate (62) on the described guide rod (61) and be positioned at the catch (63) of valve plate (62) one sides, described catch (63), valve plate (62), guide rod (61) are integral structure, be provided with Sealing (65) between valve plate (62) and catch (63), sealing part (65) adopts molding and forming.

2, the spool of safety check according to claim 1, it is characterized in that, the diameter of all rounded and catch (63) of described catch (63) and valve plate (62) is less than the diameter of valve plate (62), the one side of Sealing (65) is resisted against on the bottom surface of valve plate (62), and another side is resisted against on the catch (63).

3, the spool of safety check according to claim 2 is characterized in that, the equal diameters of described Sealing (65) rounded and its diameter and valve plate (62).

4, the spool of safety check according to claim 1 and 2 is characterized in that, has spring seat (64) on the end face of described valve plate (62).

According to the spool of claim 1 or 2 or 3 described safety check, it is characterized in that 5, described Sealing (65) adopts the nitrile rubber material to make.

According to the spool of claim 1 or 2 or 3 described safety check, it is characterized in that 6, be provided with support plate (66) in the described Sealing (65), support plate (66) is connected on the guide rod (61).

7, the spool of safety check according to claim 6 is characterized in that, described support plate (66) is provided with several through holes (67).