CN2237761Y

CN2237761Y - Butterfly valve

Info

Publication number: CN2237761Y
Application number: CN 95233930
Authority: CN
Inventors: 傅二翔; 李湘秋
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-30
Filing date: 1995-05-30
Publication date: 1996-10-16
Anticipated expiration: 2005-05-30

Abstract

The utility model discloses a butterfly valve, which comprises a valve body, a butterfly plate, a butterfly plate axle, a sealing system, a bearing set of automatic lubrication and a driving device. The butterfly plate axle is designed to offset along the axial direction and the radial direction to enable the angle between the closing plane surface of the butterfly plate and the axial direction of the valve body to be 120 DEG. The sealing adopts an elastic sealing system comprising two O-shaped sealing rings. The butterfly plate axle adopts the bearing set of automatic lubrication and a driving mechanism comprising copper alloy and PTFE in superimposing. Thus the butterfly valve overcomes a series of defects of poor sealing performance of the prior butterfly valve. The utility model has convenient opening, reliable sealing, long service life, low opening torque, short travel range, simple structure and convenient maintenance. The utility model also reserves the advantage of good flow characteristic of the traditional butterfly valve.

Description

Butterfly valve

The utility model is a kind of pipeline valve, particularly be the butterfly valve of using in the pipeline.

In recent years advance by leaps and bounds along with China is industrialized, the petrochemical industry development is also increased the requirement of valve especially rapidly thereupon, this has promoted the development of valve industry, particularly the valve development of diameter less (it is following to refer generally to DN100) is very fast, large diameter all kinds of valve is because of being subjected to the restriction of its structure, seal form, processing conditions etc., develop slower, particularly slower to the large-diameter valves development that has elevated pressures (poor) and high leak tightness to require.

Butterfly valve also is a kind of of numerous valves, it and other valves are relatively, outstanding characteristics are that Flow characteristics is good, particularly large-diameter valves its flow resistance when fully open position only is the 5-10% of the stop valve flow resistance of same size, but butterfly valve also has its shortcoming, as from for internal leakage, sealability is relatively poor, more obvious under the situation of major diameter, high pressure, unlatching moment is big, this is that fluid produces uneven moment of torsion on butterfly plate, and the friction torque that the sealing between the friction torque on the butterfly plate axis bearing and butterfly plate and valve body produces causes; Opening travel is long, the angle of tradition its butterfly plate closing plane of butterfly valve and valve axis is 90 degree, valve just can obtain full flow when usually butterfly plate must rotate and spend greater than 60, so the stroke length that stroke ratio stop valve, the gate valve of its driving mechanism are required is many, and the utilization ratios in the 30 degree strokes of butterfly plate at the beginning of opening or before closing are very low, it is relatively also long more to cause seal element to be in the process of high-velocity fluid, and it is also big more that fluid washes away the infringement that causes to it.

The purpose of this utility model provides a kind of good airproof performance, opens the butterfly valve that moment is little, opening travel is little.

The purpose of this utility model is achieved in that accompanying drawings is as follows:

This butterfly valve is mainly formed (6) by valve body (1), butterfly plate (2), butterfly plate axis (3), drive unit (4), sealing system (5) and self oiling bearing and is formed, and valve body (1) is a flanged (FLGD) cylinder in two ends, and its structural feature is:

1. be provided with the ring-shaped valve seats (7) of a projection in valve body (1) tube, the outer rim of butterfly plate (2) forms sealing by sealing system (5) and valve seat (7) and contacts, and the angle of the closing plane of butterfly plate (2) and valve body (1) axis is 120 degree;

2. butterfly plate (2) is asymmetric butterfly, and butterfly plate (2) is fixedlyed connected with butterfly plate axis (3), and butterfly plate axis (3) is horizontally disposed with, and its two ends are provided with self oiling bearing group (6) on valve body (1), and butterfly plate axis (3) reaches radial deflection vertically;

3. sealing system (5) is made up of interior O-ring seals of outer O-ring seals (9) (11) and elastic ring (10); Outer O shape circle (9) is inserted in the interior groove (8) of valve seat (7), interior O-ring seals (11) and elastic ring (10) are arranged in the groove (15) on the outer rim of butterfly plate (2), butterfly plate (2) is when closing, and the outer rim of elastic ring (10) contacts with outer O-ring seals (9) and forms sealing;

4. the self oiling bearing group of butterfly plate axis (3) is that Cuprum alloy ring (16) is installed in the bearing hole of valve body (1) with polytetrafluoroethylene ring (17) stack composition.

Advantage of the present utility model is a lot, and butterfly plate axis radially is offset the unlatching moment that has reduced butterfly valve in the design, makes butterfly plate closed position plane 30 degree that lean forward, and promptly the angle of its plane and valve axis is 120 to spend, and has reduced the corner when reaching peak rate of flow; Sealing between butterfly plate (2) and valve body (1) has adopted two O RunddichtringOs to add the resilient sealing system that elastic ring is formed, and has solved the shortcoming of general butterfly valve seal difference; Butterfly plate axis (3) bearing has adopted the self oiling bearing group of being made up of the stack of Cuprum alloy ring and polytetrafluoroethylene ring, has the dual functions of bearing and sealing, make the utility model butterfly valve have sealing reliably, seal life is long; It is convenient to open, and opens that moment is little, opening travel is little, simple in structure, easy to maintenance, and has kept the good advantage of traditional butterfly valve Flow characteristics.

Accompanying drawing 1 is the butterfly valve structure schematic representation;

Accompanying drawing 2 is a butterfly valve seal system architecture schematic representation;

Accompanying drawing 3 is a butterfly plate axis self oiling bearing group structural representation in the butterfly valve;

Accompanying drawing 4 is a butterfly valve driving device structure schematic representation.

Description of drawings

1 is valve body, and 2 is butterfly plate, and 3 is butterfly plate axis, and 4 is drive unit, 5 is sealing system, and 6 is the self oiling bearing group, and 7 is valve seat, and 8 is groove, 9 is outer O-ring seals, and 10 is elastic ring, and 11 is interior O-ring seals, and 12 are ring, 13 is bolt, and 14 are auxiliary O-ring seals, and 15 is groove, and 16 is the Cuprum alloy ring, 17 is polytetrafluoroethylene ring, and 18 is gland, and 19 is bolt, and 20 is that handwheel 21 is pivoted arm, 22 is two hinge groups, and 23 is screw rod, and 24 is nut, and 25 is supporting axle.

By accompanying drawing 1 as can be known, butterfly valve is made up of sealing system (5) between valve body (1), butterfly plate (2), butterfly plate axis (3), butterfly plate (2) and the valve body (1) and drive unit (4), in butterfly valve structure, butterfly plate axis (3) reaches radial deflection vertically, making traditional symmetrical adjustment deformation is asymmetric layout, makes butterfly plate (2) near closing plane, has the unlatching moment of torsion under the effect of fluid, go up the closing torque that produces to offset segment fluid flow at butterfly plate (2), reduced the unlatching moment of butterfly valve; Axial dipole field makes and forms sealing continuously between butterfly plate (2) and the valve body (1); Two kinds of skews add together, can reduce sealing both sides' friction process, make butterfly plate (2) when initial or last several years of opening or closing, butterfly plate (2) go up the elastic ring (10) installed just with valve seat in outer O-ring seals (9) in the groove (8) come in contact.

The angle of butterfly plate in the accompanying drawing 1 (2) closed position plane and valve body (1) axis is designed to 120 degree, increased by 30 degree than traditional butterfly valve, can reduce the corner when reaching peak rate of flow like this, change 45 degree into from original 60 degree, this is the valve driving mechanism condition of providing convenience, and has shortened the opening travel of butterfly valve.

Form by the interior O-ring seals (11), elastic ring (10) and the outer O-ring seals (9) that are provided with in butterfly plate (2) the outer rim groove (15) by finding out the sealing system (5) between butterfly plate (2) and the valve body (1) in the accompanying drawing 2, interior O RunddichtringO (11) is in groove (15) bottom of offering on butterfly plate (2) cylindrical, in groove (15) mouth elastic ring (10) is housed, outer O-ring seals (9) is arranged in the groove (8) that valve seat (7) is offered, when butterfly plate (2) when closing, elastic ring (10) extruding outer O-ring seals (9); The regulating action of sealing configuration is to be finished by the resiliently deformable of feather valve (10) and interior O-ring seals (11) in the butterfly valve, the distortion that each of outer rim of elastic ring (10) footpath of different with frictional force generations with outer O-ring seals extruding force makes progress, thereby play regulatory function voluntarily, wearing and tearing can be reduced, the sealing friction torque that the position produced can be reduced again Sealing.

As can be seen from Figure 2, in order to process the requirement with assembly technology, groove (15) is combined by ring (12) and butterfly plate (2), encircles (12) and is fastened on the butterfly plate (2) by bolt (13), in order to guarantee the sealing between it, increase by an auxiliary O-ring seals (14).

As can be seen, during for fear of initial and last several years of opening or closing at butterfly plate (2), fluid is extruded groove (8) with outer O-ring seals (9), and groove (8) is made dovetail type from accompanying drawing 2.If sediments is arranged in the fluid, for avoiding sediments the outer O-ring seals (9) in the dovetail groove (8) is extruded outside the ditch, can select for use the clamping type seal element to replace outer O-ring seals (9).

From accompanying drawing 3 as can be seen, the self oiling bearing group (6) of butterfly plate axis (3) is made up of Cuprum alloy ring (16) polytetrafluoroethylene ring (17) stack, compress by gland (18), be fixed on the valve body (1) with bolt (19), this simple in structure, make easily, and this bearing has the dual functions of bearing and sealing concurrently, utilize the cold flow characteristic of teflon, adjust the bearing play, to guarantee its supporting precision and sealability.

As seen from Figure 4, the drive unit of butterfly valve (4) be by handwheel (20), top fixedly handwheel (20) vertical screw rod (23), nut (24), be fixed on the back shaft (25) on the valve body (1), the two hinge groups (22) that are connected with screw rod (23) lower end, form with the pivoted arm (21) that two hinge groups (22) axle is connected, pivoted arm (21) the other end connects the overhanging end of butterfly plate axis (3).

When rotating handwheel (20), driving screw rod (23) moves up and down under the location of back shaft (25) by nut (24), driving two hinge groups (22) moves up and down, drive pivoted arm (21) again around the butterfly plate axis rotational, driving butterfly plate axis (3) again rotates, drive butterfly plate (2) again and in valve body (1), rotate, finish the opening and closing process of butterfly valve.

Claims

1, a kind of butterfly valve is formed (6) by valve body (1), butterfly plate (2), butterfly plate axis (3), drive unit (4), sealing system (5) and self oiling bearing and is formed, and valve body (1) is a flanged (FLGD) cylinder in two ends, it is characterized in that:

3. sealing system (5) is made up of outer O-ring seals (9), interior O-ring seals (11) and elastic ring (10); Outer O shape circle (9) is installed in the interior groove (8) of valve seat (7), interior O-ring seals (11) and elastic ring (10) are arranged in the groove (15) on the outer rim of butterfly plate (2), butterfly plate (2) is when closing, and the outer rim of elastic ring (10) contacts with outer O-ring seals (9) and forms sealing;

2, butterfly valve according to claim 1 is characterized in that: groove (15) is made up of ring (12) and butterfly plate (2), and ring (12) is fastened on the butterfly anti-(2) by bolt (13), adds auxiliary O-ring seals (14) between ring (12) and the butterfly plate (2).

3, butterfly valve according to claim 1 is characterized in that: groove (8) is a dovetail type.