CN204004469U - A kind of butterfly valve - Google Patents

Abstract

The utility model provides a kind of butterfly valve, belongs to valve technology field.It has solved the not good problem of existing soft sealing butterfly valve sealing effect.This butterfly valve comprises valve body, upper valve rod, lower valve rod and valve plate, valve body two ends are respectively feed-water end and waterexit end, upper valve rod and lower valve rod are axially fixed in respectively top and the bottom of valve body, valve plate is positioned at valve body, the inner of upper valve rod and lower valve rod is plugged on respectively on valve plate, feed-water end inside has ring-shaped step one and the ring-shaped step two arranging from inside to outside, ring-shaped step two is embedded with between trim ring and this trim ring and ring-shaped step one and forms an annular recess, in groove, be provided with Sealing, valve plate is tapered near the end face of feed-water end, Sealing offers taper hole and valve plate outer rim and the taper hole inwall close contact matching with valve plate end face, Sealing comprises butting section and the contacting part contacting with valve plate, butting section and groove inwall offset and the thickness of butting section is less than the thickness of contacting part.This butterfly valve has advantages of good sealing effect.

Description

A kind of butterfly valve

Technical field

The utility model belongs to valve technology field, relates to the butterfly valve of a kind of butterfly valve, particularly a kind of good sealing effect.

Background technique

Butterfly valve is again Flap valve, it is a kind of modulating valve simple in structure, the square work valve butterfly valve that can be used for the switch control of low pressure pipeline medium refers to that closure member (flap or butterfly plate) is disk, around valve shaft, rotate to reach a kind of valve of open and close, valve can be used for controlling flowing of all kinds fluids such as air, water, steam, various Korrosionsmedium, mud, oil product, liquid metal and radiating medium.On pipeline, main rising cut off and throttling action.Butterfly valve open-shut device is a discoidal butterfly plate, and the axis around himself in valve body rotates, thereby reaches the object that opens and closes or regulate.

A kind of soft sealing butterfly valve [application number: 201120287777.2 as disclosed in Chinese patent storehouse, notice of authorization number: CN 202252022 U], include the valve body of tubulose, the top of valve body, below is rotated and is provided with semiaxis, lower semiaxis, the two ends of described valve body are respectively entrance point, outlet end, the lower end of upper semiaxis is installed with valve plate, the lower end rotating shaft of the upper end of upper semiaxis and valve plate arranges, in entrance point, be fixed with gland, the front end overhead of gland has sealing circle body, the edge laminating of sealing circle body and valve plate arranges, between described upper semiaxis and the valve seat on valve body top, be provided with stuffing box gland, in stuffing box gland, be provided with a plurality of seal rings, described sealing circle body both sides are provided with projection, inwall has the flange stretching out.

Above-mentioned soft sealing butterfly valve is the sealability when reaching this butterfly valve and close by the flange on Sealing and valve plate outer rim, but owing to using long-term or, flange can wear and tear larger, and the sealability between Sealing and valve plate is reduced.

Summary of the invention

The purpose of this utility model is to have the problems referred to above for existing technology, has proposed a kind of butterfly valve of good sealing effect.

The purpose of this utility model can realize by following technical proposal: a kind of butterfly valve, comprise valve body, upper valve rod, lower valve rod and valve plate, above-mentioned valve inner is that cavity and its two ends are respectively feed-water end and waterexit end, above-mentioned upper valve rod and lower valve rod are axially fixed in respectively top and the bottom of valve body, above-mentioned valve plate is positioned at valve body, above-mentioned upper valve rod the inner is plugged on valve plate upper end and above-mentioned lower valve rod is plugged on valve plate lower end, above-mentioned feed-water end inside has stepped ring-shaped step one and the ring-shaped step two arranging from inside to outside, above-mentioned ring-shaped step two is embedded with between trim ring and this trim ring and ring-shaped step one and forms an annular recess, in this groove, be provided with Sealing, it is characterized in that, above-mentioned valve plate inwardly increases gradually near the end face diameter tapered and this end face of feed-water end, above-mentioned Sealing offers taper hole and valve plate outer rim and the taper hole inwall close contact matching with valve plate end face, above-mentioned Sealing comprises butting section and the contacting part contacting with valve plate, above-mentioned butting section and groove inwall offset and the thickness of this butting section is less than the thickness of contacting part.

When fluid flows to waterexit end from feed-water end, fluid promotes Sealing and moves to valve rod direction, make valve plate outer rim and taper hole inwall press tighter and tighter, realized unidirectional reliable sealing, when fluid flows to feed-water end from waterexit end, and on valve plate, tapered end face can be given the thrust of Sealing away from valve rod direction, and Sealing is owing to being stoped and can not move to the direction away from valve rod by trim ring, and then be subject to the opposition of trim ring and near valve rod direction motion, realized reverse reliable sealing; When contacting part and valve plate closely against time, because the thickness of contacting part is greater than the thickness of butting section, make the deformation of butting section be greater than the deformation of contacting part, make the internal diameter of Sealing become large, thereby make Sealing under the impact of current, continue to move toward valve rod direction, further make valve plate and being connected more of Sealing seal.

In above-mentioned butterfly valve, all ringwise, above-mentioned butting section is connected to the cross section semicircular in shape of contacting part outer rim middle part and this butting section for above-mentioned contacting part and butting section.

Butting section is connected to contacting part outer rim middle part, and the active force that makes contacting part be subject to valve plate is more stably delivered on butting section; The cross section semicircular in shape of butting section, makes butting section more stably be resisted against bottom portion of groove; Adopt above-mentioned design, make Sealing stably distortion downwards under the effect of valve plate, make valve plate outer rim and taper hole inwall press tighter and tighter, further enhanced leaktightness performance.

In above-mentioned butterfly valve, above-mentioned contacting part outer rim middle part caves inward and forms an annular recess, and the cross section of this recess is in the shape of the letter V, above-mentioned recess comprises the first side wall and the second sidewall, above-mentioned the first side wall arranges along Sealing Central Symmetry near trim ring and this first side wall and the second sidewall, above-mentioned butting section be inclined in recess and its true dip direction identical with the end face of valve plate.

The recess that the setting of contacting part outer rim is in the shape of the letter V is used for being connected with butting section, reduce the area of contact of butting section and contacting part, make butting section that larger deformation occur under the effect of valve plate, thereby Sealing is further moved toward valve rod direction under the effect of hydraulic pressure, improve Sealing and valve rod connection sealing; Butting section be inclined in recess and its true dip direction identical with the end face of valve plate, make power that butting section is subject to perpendicular to the end face of butting section, and then butting section can be stably out of shape downwards.

In above-mentioned butterfly valve, above-mentioned butting section is connected to the bead place in contacting part outside.

Adopt such design, make this seal configuration compacter, reduce the cost of the production seal simultaneously.

In above-mentioned butterfly valve, above-mentioned trim ring inner side has ring-type convex shoulder one, on above-mentioned ring-shaped step one, there is ring-type convex shoulder two and this convex shoulder two relative with above-mentioned convex shoulder one, above-mentioned contacting part both ends of the surface all have the gear edge of protrusion, and two gears are along leaning with groove inwall respectively, one of them above-mentioned gear is along being positioned at convex shoulder one below, and another gear is along being positioned at convex shoulder two belows.

One of them gear is along being positioned at convex shoulder one below, and another gear is along being positioned at convex shoulder two belows, by convex shoulder one and two pairs of Sealings of convex shoulder, carries out axial limiting, prevents when this butterfly valve is opened, at the impact lower seal disengaging groove of current; Gear, along leaning with groove inwall respectively, can stably be out of shape Sealing downwards, and play occurs while avoiding Sealing to be out of shape downwards, the connection sealing between impact and valve plate.

In above-mentioned butterfly valve, between above-mentioned Sealing upper end end face and convex shoulder one, form an annular seal groove one, and sealing groove one communicates with valve cavity.

When fluid flows into from feed-water end, make valve plate be subject to the impacting force of Sealing, meanwhile, fluid can be full of seal groove one, makes Sealing form the effect of a spring-like under the pressure action of fluid, producing elastic force acts on valve plate, valve plate and Sealing are further compressed and produce sealing, and fluid is larger, the pressure of generation is larger, impacting force to valve plate is larger, and sealing effect is better.

In above-mentioned butterfly valve, between above-mentioned Sealing lower end surface and convex shoulder two, form an annular seal groove two, above-mentioned seal groove two communicates with valve cavity, and above-mentioned seal groove one and seal groove two arrange along Sealing Central Symmetry.

When fluid flows into from waterexit end, fluid can be full of seal groove two, makes Sealing form the effect of a spring-like under the pressure action of fluid, produces elastic force and acts on valve plate, valve plate and Sealing is further compressed and produce sealing.

Compared with prior art, this butterfly valve has the following advantages:

1, by being set, the thickness of butting section is less than the thickness of contacting part, make the deformation of butting section under the effect of valve plate be greater than the deformation of contacting part, make the internal diameter of Sealing become large, thereby make Sealing under the impact of current, continue to move toward valve rod direction, further make valve plate and being connected more of Sealing seal.

2, the recess that the setting of contacting part outer rim is in the shape of the letter V is used for being connected with butting section, reduce the area of contact of butting section and contacting part, make butting section that larger deformation occur under the effect of valve plate, thereby Sealing is further moved toward valve rod direction under the effect of hydraulic pressure, improve Sealing and valve rod connection sealing.

3, by being arranged at seal groove one and the seal groove two that valve cavity is identical, fluid enters in valve body and makes seal groove one or seal groove two fill up, under the pressure of fluid, make Sealing form the effect of a spring-like, produce elastic force and act on valve plate, valve plate and Sealing are further compressed and produce sealing.

Accompanying drawing explanation

Fig. 1 is the part sectional structure schematic diagram of this butterfly valve;

Fig. 2 is the structure for amplifying schematic diagram at A place in Fig. 1;

Fig. 3 is the sectional structure schematic diagram of Sealing;

Fig. 4 is that Sealing is removed the sectional structure schematic diagram behind butting section;

Fig. 5 is the structural representation of this butterfly valve.

In figure, 1, valve body; 1a, feed-water end; 1a1, ring-shaped step one; 1a2, ring-shaped step two; 1a3, convex shoulder two; 2, upper valve rod; 3, lower valve rod; 4, bottom; 4a, annular protrusion; 5, valve plate; 6, Pneumatic actuator; 7, bolt; 8, sealing gasket; 9, axle sleeve; 10, pin; 11, pressing plate; 12, filler; 13, trim ring; 13a, convex shoulder one; 14, groove; 15, Sealing; 15a, butting section; 15b, contacting part; 15b1, recess; 15b2, gear edge; 15b3, the first side wall; 15b4, the second sidewall; 16, seal groove one; 17, seal groove two.

Embodiment

Be below specific embodiment of the utility model by reference to 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 and Figure 5, this butterfly valve comprises the compositions such as valve body 1, upper valve rod 2, lower valve rod 3, bottom 4, the valve plate 5 that is positioned at valve body 1, Pneumatic actuator 6.

Wherein, valve body 1 is inner is respectively feed-water end 1a and waterexit end for cavity and valve body 1 two ends.Bottom 4 is fixed on valve body 1 bottom, specifically, bottom 4 upper ends have annular protrusion 4a, the valve body 1 bottom formation annular groove that caves inward, annular protrusion 4a is plugged in annular groove and makes bottom 4 be positioned at valve body 1 bottom, and bolt 7 one end are through bottom 4 and screw in that valve body 1 is interior is fixed on valve body 1 bottom firmly by bottom 4.Further optimize, between annular protrusion 4a and annular groove diapire, be provided with sealing gasket 8, the connection of bottom 4 and valve body 1 is sealed more.

Annular groove bottom offers through hole and this through hole is through to valve body 1 top.Upper valve rod 2 and lower valve rod 3 are connected to valve body 1 top and bottom and both and are all positioned at through hole.The through hole that is positioned at valve body 1 top and bottom is all fixed with axle sleeve 9, and upper valve rod 2 is axially fixed in and is positioned at the axle sleeve 9 at top and lower valve rod 3 is axially fixed in the axle sleeve 9 that is positioned at bottom.Wherein, lower valve rod 3 lower ends are stretched out through hole and are leant with annular protrusion 4a, further spacing to lower valve rod 3.Lower valve rod 3 upper ends extend in valve body 1 cavity and insert valve plate 5 lower ends.For lower valve rod 3 can be stably inserted in valve plate 5, by pin 10, lower valve rod 3 and valve plate 5 are stably fixed together.

Upper valve rod 2 lower ends extend in valve body 1 cavity and insert valve plate 5 upper ends.For upper valve rod 2 can be stably inserted in valve plate 5, by pin 10, upper valve rod 2 and valve plate 5 are stably fixed together.The upper end of upper valve rod 2 is stretched out valve body 1 and is connected with Pneumatic actuator 6, Pneumatic actuator 6 comprises pneumatic drive head and connecting end, described valve rod upper end is connected and fixes with the connecting end of Pneumatic actuator 6 by screw, thereby and by pneumatic rotating shaft drive upper valve rod 2 rotation drive valve plates 5 rotations, realize the unlatching of this butterfly valve or close.

Further optimize, valve body 1 top is connected with pressing plate 11 and this pressing plate 11 seals through hole upper end completely.Pressing plate 11 and be provided with between the axle sleeve 9 of via top and be filler 12 cylindraceous, the inner edge of this filler 12 and upper valve rod 2 outer walls offset and filler 12 outer rims and valve body 1 inwall offset, make to keep sealing between upper valve rod 2 and valve body 1, avoid causing leak of liquid.

As shown in Figure 2, feed-water end 1a inside has stepped ring-shaped step one 1a1 and ring-shaped step two 1a2 that arrange from inside to outside, and the internal diameter of ring-shaped step two 1a2 is less than the internal diameter of ring-shaped step one 1a1.Ring-shaped step two 1a2 are embedded with trim ring 13 and this trim ring 13 is fixed on feed-water end 1a end face by bolt 7.Between trim ring 13 and ring-shaped step one 1a1, form and in an annular recess 14 and this groove 14, be provided with Sealing 15 in the form of a ring.When butterfly valve cuts out, Sealing 15 is set in valve plate 5 near end Qie Gai end outer rim and the Sealing 15 Inner edge close contacts of feed-water end 1a.

Further optimize, as depicted in figs. 1 and 2, valve plate 5 inwardly increases gradually near the end face diameter tapered and this end face of feed-water end 1a, and Sealing 15 offers taper hole and valve plate 5 outer rims and the taper hole inwall close contact matching with valve plate 5 end faces.Wherein, as shown in Figure 2, Sealing 15 comprises butting section 15a and the contacting part 15b contacting with valve plate 5, butting section 15a and groove 14 inwalls offset and the thickness of this butting section 15a is less than the thickness of contacting part 15b, when fluid flows to waterexit end from feed-water end 1a, fluid promotes Sealing 15 and moves to valve rod direction, because the thickness of contacting part 15b is greater than the thickness of butting section 15a, make the deformation of butting section 15a be greater than the deformation of contacting part 15b, make the internal diameter of Sealing 15 become large, thereby make Sealing 15 under the impact of current, continue to move toward valve rod direction, further strengthen the sealing being connected of valve plate 5 and Sealing 15.

In the present embodiment, as shown in Figure 3 and Figure 4, all ringwise, in the middle part of contacting part 15b outer rim, cave inward formation one annular recess 15b1 and this recess 15b1 cross section are V-shape for contacting part 15b and butting section 15a.Have, recess 15b1 comprises the first side wall 15b3 and the second sidewall 15b4, and the first side wall 15b3 is symmetrical arranged along the center line of Sealing 15 near trim ring 13 and this first side wall and the second sidewall 15b4.Butting section 15a semicircular in shape, this butting section 15a be inclined in recess 15b1 and its true dip direction identical with the end face of valve plate 5.Further optimize, butting section 15a is connected to the bead place in contacting part 15b outside, makes this Sealing 15 structures compacter, reduces the cost of the production seal 15 simultaneously.

As shown in Figure 1, trim ring 13 inner sides have ring-type convex shoulder one 13a, and ring-type convex shoulder two 1a3 and this convex shoulder two 1a3 that ring-shaped step one 1a1 has protrusion are relative with convex shoulder one 13a.The gear that contacting part 15b both ends of the surface all have protrusion is along 15b2, and two gears lean with groove 14 inwalls respectively along 15b2, and one of them gear is positioned at convex shoulder one 13a below along 15b2, and another gear is positioned at convex shoulder two 1a3 belows along 15b2.Convex shoulder one 13a and convex shoulder two 1a3 that pass through carry out axial limiting to Sealing 15, prevent when this butterfly valve is opened, at the impact lower seal 15 disengaging grooves 14 of current.

Further optimize, between Sealing 15 upper end end faces and convex shoulder one 13a, form an annular seal groove 1, and sealing groove 1 communicates with valve body 1 cavity.Between Sealing 15 lower end surfaces and convex shoulder two 1a3, form an annular seal groove 2 17, seal groove 2 17 communicates with valve body 1 cavity, and seal groove 1 and seal groove 2 17 are along Sealing 15 Central Symmetry settings.When fluid flows into from feed-water end 1a, make valve plate 5 be subject to the impacting force of Sealing 15, meanwhile, fluid can be full of seal groove 1, makes Sealing 15 form the effect of a spring-like under the pressure action of fluid, producing elastic force acts on valve plate 5, make valve plate 5 and Sealing 15 further compress and produce sealing, and fluid is larger, the pressure of generation is larger, impacting force to valve plate 5 is larger, and sealing effect is better; When fluid flows into from waterexit end, fluid can be full of seal groove 2 17, makes Sealing 15 form the effect of a spring-like under the pressure action of fluid, produces elastic force and acts on valve plate 5, makes valve plate 5 further compress and produce sealing with Sealing 15.

Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements 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.

Claims (7)

1. a butterfly valve, comprise valve body, upper valve rod, lower valve rod and valve plate, above-mentioned valve inner is that cavity and its two ends are respectively feed-water end and waterexit end, above-mentioned upper valve rod and lower valve rod are axially fixed in respectively top and the bottom of valve body, above-mentioned valve plate is positioned at valve body, above-mentioned upper valve rod the inner is plugged on valve plate upper end and above-mentioned lower valve rod is plugged on valve plate lower end, above-mentioned feed-water end inside has stepped ring-shaped step one and the ring-shaped step two arranging from inside to outside, above-mentioned ring-shaped step two is embedded with between trim ring and this trim ring and ring-shaped step one and forms an annular recess, in this groove, be provided with Sealing, it is characterized in that, above-mentioned valve plate inwardly increases gradually near the end face diameter tapered and this end face of feed-water end, above-mentioned Sealing offers taper hole and valve plate outer rim and the taper hole inwall close contact matching with valve plate end face, above-mentioned Sealing comprises butting section and the contacting part contacting with valve plate, above-mentioned butting section and groove inwall offset and the thickness of this butting section is less than the thickness of contacting part.

2. a kind of butterfly valve according to claim 1, is characterized in that, all ringwise, above-mentioned butting section is connected to the cross section semicircular in shape of contacting part outer rim middle part and this butting section for above-mentioned contacting part and butting section.

3. a kind of butterfly valve according to claim 2, it is characterized in that, above-mentioned contacting part outer rim middle part caves inward and forms an annular recess, and the cross section of this recess is in the shape of the letter V, above-mentioned recess comprises the first side wall and the second sidewall, above-mentioned the first side wall and the second sidewall arrange along Sealing Central Symmetry, above-mentioned butting section be inclined in recess and its true dip direction identical with the end face of valve plate.

4. a kind of butterfly valve according to claim 3, is characterized in that, above-mentioned butting section is connected to the bead place in contacting part outside.

5. according to a kind of butterfly valve described in claim 2 or 3 or 4, it is characterized in that, above-mentioned trim ring inner side has ring-type convex shoulder one, on above-mentioned ring-shaped step one, there is ring-type convex shoulder two and this convex shoulder two relative with above-mentioned convex shoulder one, above-mentioned contacting part both ends of the surface all have the gear edge of protrusion, and two gears are along leaning with groove inwall respectively, and one of them above-mentioned gear is along being positioned at convex shoulder one below, and another gear is along being positioned at convex shoulder two belows.

6. a kind of butterfly valve according to claim 5, is characterized in that, form an annular seal groove one, and sealing groove one communicates between above-mentioned Sealing upper end end face and convex shoulder one with valve cavity.

7. a kind of butterfly valve according to claim 6, it is characterized in that, between above-mentioned Sealing lower end surface and convex shoulder two, form an annular seal groove two, above-mentioned seal groove two communicates with valve cavity, and above-mentioned seal groove one and seal groove two arrange along Sealing Central Symmetry.