CN2557762Y

CN2557762Y - Eccentric butterfly valve

Info

Publication number: CN2557762Y
Application number: CN 02239222
Authority: CN
Inventors: 赵广生; 王咏晖; 高强
Original assignee: Wuzhong Meter Co ltd
Current assignee: Ningxia Yinxing Energy Co ltd; Wuzhong Instrument Co Ltd
Priority date: 2002-06-18
Filing date: 2002-06-18
Publication date: 2003-06-25
Anticipated expiration: 2012-06-18

Abstract

The utility model discloses an eccentric butterfly valve, comprising a valve rod, a valve seat, a valve plate and a valve shaft. The valve plate is an eccentric valve plate whose seal surface is a spherical surface. The valve seat can be a ring processed by elastic thin-walled steel plate, whose cross-section is similarly U-shaped; the symmetrical center line of the U-shaped cross-section is in parallel with the center of the ring; the valve seat can also be a soft rubber seal ring; a cushion ring is arranged between the valve seat and the valve body; the valve seat and the cushion ring are fixed on one side of the medium exit of the valve body through pressure rings. The butterfly valve has the advantages of easy processing, good sealing performance, high temperature resistance and solid scouring, which can also serve as a shut-off valve.

Description

A kind of eccentric-butterfly-valve

Technical field

The utility model relates to the butterfly valve field, particularly a kind of eccentric-butterfly-valve.

Background technique

The tradition butterfly valve is widely used in the large diameter pipeline control system owing to low cost of manufacture under equal conditions.Generally be not eccentric or single eccentric in the existing reed valve, also having of better performances is two eccentric or three off-centre.Chinese patent CN2145896Y, CN2413101, CN2307960Y etc. promptly disclose more such butterfly valves.The quality of butterfly valve performance depends primarily on the cooperation of valve plate and valve seat.The butterfly valve plate of prior art or because structure is limit and can not be used as cut-off valve perhaps can not adapt to the occasion of condition harshnesses such as high temperature, solid wash away, and perhaps the complex structure of valve plate and valve seat is difficult to process, and as above-mentioned two dimension or three-dimensional eccentric-butterfly-valve promptly is.

Summary of the invention

Task of the present utility model is the defective that overcomes above-mentioned prior art, designs a kind of processing that is easy to, and with low cost, high temperature resistant and solid washes away, and can be as the novel eccentric-butterfly-valve of cut-off valve use.

The utility model has adopted following technological scheme:

A kind of eccentric-butterfly-valve, comprise valve body, valve seat, eccentric valve plate, the valve shaft that links to each other with valve plate, the sealing surface that it is characterized in that described valve plate is a sphere, and it is determined by following geometric position: the axle center with described valve shaft is that the horizontal line of eccentricity that a horizontal center line and departs from 2 °～4 ° of this center lines is done in the center of circle; Equally, vertical line of eccentricity of doing the vertical center line in this axle center and departing from 2 °～4 ° of this center lines; With horizontal line of eccentricity is the upper and lower equidistant parallel offset line of respectively doing of center line, make a slipping line towards valve plate media outlet direction by vertical line of eccentricity again, intersection point with this skew line and above-mentioned two skew lines is that circle is drawn in the center of circle respectively, and the sectional shape along thickness direction that the shape that is surrounded is valve plate is intersected in the thickness of slab sideline of the circular arc line of gained and valve plate.

Described valve shaft is sealed between cover plate and the valve body by the sealed cover that is connected with valve seal, is crimped with filler base plate, stuffing box packing and filler top board therebetween from bottom to top; Valve shaft stretches out outside the cover plate and links to each other with actuator.

Described valve seat is the ring that is processed into by the elastic sheet iron that a kind of cross section is " U " shape, and symmetrical center line that should " U " tee section is parallel with the center line of this ring, and vertical with the warp that encircles; Valve seat is fixed on media outlet direction one side of valve body by pressure ring.

Described valve seat also can be a kind of seal ring that is made of the soft sealing material of rubber and so on, is provided with gasket ring between valve seat and described valve body, and valve seat and gasket ring are fixed on media outlet direction one side of valve body by pressure ring.

Owing to adopted such scheme, the valve plate that manufacturing is come out has two eccentric structures, under the effect of angle off-centre, makes valve plate asymmetric with respect to its center line, during work, thus its ball face sealing face extruding valve seat and make it to take place deformation and sealing effect is reached cause ideal.Wash away serious occasion for high temperature, solid, owing to adopted the valve seat of above-mentioned similar " U " shape structure, not only good springiness, high temperature resistant, anti-solid wash away, and are easy to processing, long, good seal performance of life-span, can reach low bubble, zero leakage.Valve seat for the soft seal form, when valve cuts out, the ball face sealing face extruding valve seat of valve plate expands outwardly it, the resiliently deformable that seal valve seat produces is compressed the gasket ring between seal valve seat and the valve body, and the preload of seal valve seat affacts valve plate, and produces a static seal, it is effectively airtight that valve is obtained under low-pressure state, the back cut out by valve because the pressure of medium will become to making the sealing of sealing pair tightr, thereby realize dynamic seal (packing), have better sealability compared to prior art.Owing to adopted above-mentioned seal approach between valve shaft and valve body and the sealed cover, thereby made this butterfly valve have better sealability.

Description of drawings

Fig. 1 is the structural representation of the utility model valve plate;

Fig. 2 is the structural representation of the utility model " U " shape valve seat;

Fig. 3 is a kind of mode of execution schematic representation of the present utility model (U-shaped valve seat);

Fig. 4 is the another kind of mode of execution schematic representation of the utility model.

Embodiment

Embodiment 1

A kind of eccentric-butterfly-valve (as shown in Figure 1, 2) comprises valve body 1, valve seat 2, eccentric valve plate 3, the valve shaft 5 that links to each other with valve plate 3.The sealing surface 31 of valve plate 3 is a sphere, it is determined by following geometric position: the axle center with valve shaft 5 is that the horizontal line of eccentricity 33 that a horizontal center line 32 and departs from 2 °～4 ° degree of this center line (the valve inside nominal diameter is different, and eccentric angle is different) is done in the center of circle; Equally, vertical line of eccentricity 35 of doing the vertical center line 34 in this axle center and departing from 2 °～4 ° of this center lines; With the horizontal line of eccentricity 33 of level is the upper and lower equidistant parallel offset line 36,37 of respectively doing of center line, make a slipping line 38 towards valve plate 2 media outlet directions 27 by vertical line of eccentricity 35 again, intersection point with this skew line and above-mentioned two skew lines 36,37 is that circle is drawn in the center of circle respectively, and the circular arc line 39 of gained intersects the cross section that the shape that is surrounded is valve plate 3 with the thickness of slab sideline of valve plate 7,8.Valve seat 2 is that a kind of cross section 21 is " U " shape, and by the ring 26 that the elastic sheet iron is processed into, the symmetrical center line 22 that is somebody's turn to do " U " tee section 21 is parallel with the center line 23 of this ring, and vertical with the warp 28 of ring 26.Valve seat 2 is fixed on media outlet direction 27 1 sides of valve body 1 by pressure ring 25.Valve shaft 3 and valve plate 2 are fixedly connected by bearing pin 9 is detachable.

For the sealability that makes this butterfly valve better, taked following measure between valve shaft 3 and the valve body 1: valve shaft 3 by and the sealed cover 10 that is tightly connected of valve body 1 be sealed between cover plate 10 and the valve body 1, crimping from bottom to top therebetween is sealed with filler base plate 11, stuffing box packing 12, filler top board 13 and cone seal pressure ring 14; Valve shaft 3 stretches out outside the cover plate 10 and links to each other with actuator 15.

Embodiment 2

As shown in Figure 4: another kind of eccentric-butterfly-valve, it also comprises valve body 1, valve seat 2, eccentric valve plate 3, the valve shaft 5 that links to each other with valve plate 3.

Different is that valve seat 2 is a kind of seal rings that are made of the soft sealing material of rubber and so on embodiment 1, is provided with gasket ring 24 between valve seat 2 and valve body 1, and valve seat 2 and gasket ring 24 are fixed on media outlet direction 27 1 sides of valve body 1 by pressure ring 25.

Claims

1. eccentric-butterfly-valve, comprise valve body (1), valve seat (2), eccentric valve plate (3), the valve shaft (5) that links to each other with valve plate (3), the sealing surface (31) that it is characterized in that described valve plate (3) is a sphere, and it is determined by following geometric position: the axle center with described valve shaft (5) is that the horizontal line of eccentricity (33) that a horizontal center line (32) and departs from 2 °～4 ° of this center lines is done in the center of circle; Equally, vertical line of eccentricity (35) of doing the vertical center line (34) in this axle center and departing from 2 °～4 ° of this center lines; With horizontal line of eccentricity (33) is the upper and lower equidistant parallel offset line (36,37) of respectively doing of center line, make a slipping line (38) towards valve plate (2) media outlet direction (27) by vertical line of eccentricity (35) again, intersection point with this skew line and above-mentioned two skew lines (36,37) is that circle is drawn in the center of circle respectively, and the circular arc line of gained (39) intersects the sectional shape along thickness direction that the shape that is surrounded is valve plate (3) with the thickness of slab sideline (7,8) of valve plate.

2. eccentric-butterfly-valve according to claim 1 is characterized in that described valve shaft (3) and valve plate (2) are by detachable being fixedly connected of bearing pin (9).

3. eccentric-butterfly-valve according to claim 1, it is characterized in that described valve shaft (3) by and the sealed cover (10) that is tightly connected of valve body (1) be sealed between cover plate (10) and the valve body (1), be crimped with filler base plate (11), stuffing box packing (12) and filler top board (13) therebetween from bottom to top; Valve shaft (3) stretches out outside the cover plate (10) and links to each other with actuator (15).

4. eccentric-butterfly-valve according to claim 3 is characterized in that between described sealed cover (10), filler top board and valve shaft (3) a cone seal pressure ring (14) being arranged.

5. according to claim 1,2,3 or 4 described eccentric-butterfly-valves, it is characterized in that described valve seat (2) is the ring (26) that is processed into by the elastic sheet iron that a kind of cross section (21) is " U " shape, the symmetrical center line (22) that is somebody's turn to do " U " tee section (21) is parallel with the center line (23) of this ring, and vertical with the warp (28) of ring (26); Valve seat (2) is fixed on media outlet direction (27) one sides of valve body (1) by pressure ring (25).

6. eccentric-butterfly-valve according to claim 1 and 2, it is characterized in that described valve seat (2) is a kind of seal ring that is made of the soft sealing material of rubber and so on, be provided with gasket ring (24) between valve seat (2) and described valve body (1), valve seat (2) and gasket ring (24) are fixed on media outlet direction (27) one sides of valve body (1) by pressure ring (25).