CN201028003Y

CN201028003Y - Butterfly valve

Info

Publication number: CN201028003Y
Application number: CNU2007200317178U
Authority: CN
Inventors: 张希恒; 俞树荣
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2007-04-23
Filing date: 2007-04-23
Publication date: 2008-02-27
Anticipated expiration: 2017-04-23

Abstract

The utility model relates to a butterfly valve which aims at no friction generated from seal pairs, guaranteeing the leak tightness of the butterfly valve, and no interference between two seal pairs while rotating. A filler gland bush 2 is arranged on a valve cover 3; a main valve stem 10 passes through the shaft hole of the filler gland bush 2 and rotates around OO' axis; the valve cover 3 is connected with a valve body 11 by a flange; the filler gland bush 2 presses on fillers 15; the main valve stem 10 and the valve cover 3 are sealed; an eccentric cam 12 which can move in an aequilate cam slot 13 is arranged on a position where the main valve stem 10 is arranged on a valve cavity; auxiliary valve stems 7 and 7' are relatively arranged on the upper end and the lower end of a butterfly plate 9; the outer ends of the auxiliary valve stems are relatively embedded into a locating plate 4 and a guiding groove arranged on the bottom of the inside of the valve body 11; spring seats are relatively arranged on the upper side and the lower side corresponding to the eccentric cam 12 of the butterfly plate 9; springs are relatively arranged on the spring seats; spring pressing shafts are relatively arranged on the springs through compressing; the spring seats relatively press on an upper side plane and a lower side plane of the eccentric cam 12.

Description

A kind of butterfly valve

Technical field

The utility model relates to a kind of butterfly valve, specifically is a kind of butterfly valve that has eccentric cam.

Background technique

For now, the sealing pair structure of metal hard-sealing butterfly valve is to realize the effectively key of sealing.Hard seal butterfly valve generally adopts two eccentric and three eccentric structures at present, and two eccentric structure difficulty of processing are bigger, and particularly for large-diameter butterfly valve, processing technology is difficult to guarantee its design geometric accuracy; The design difficulty of three eccentric structures is bigger; The butterfly plate of two off-centre and three eccentric structure hard seal butterfly valves is to seal in rotation, and sealing pair rubs mutually, is difficult for guaranteeing sealing, and valve body sealing surface and butterfly plate sealing surface interfere in rotatablely moving easily, hinders the opening and closing of butterfly valve.

Summary of the invention

The purpose of this utility model provides a kind of butterfly valve, makes sealing pair not produce friction, guarantees the sealing of butterfly valve, and two sealing pairs do not interfere phenomenon when rotated.

The utility model is a kind of butterfly valve, Gland 2 is installed on the valve gap 3, main valve stem 10 passes the axis hole of Gland 2, main valve stem 10 is around axes O O ' rotation, valve gap 3 is connected with valve body 11 usefulness flanges, Gland 2 compresses filler, with main valve stem 10 and valve gap 3 sealings, the position installation one that is arranged in valve pocket on main valve stem 10 can be at the eccentric cam 12 of constantbreadth cam groove 13 motions, at the symmetrical respectively auxiliary valve rod 7 of installing of the upper and lower end of butterfly plate 9,7 ', auxiliary valve rod 7,7 ' the outer end embed the guiding groove 14 that positioning plate 4 and valve body 11 inner bottom parts are offered respectively, 14 ' in, the upper and lower sides of corresponding eccentric cam 12 is offered spring seat 8 respectively on butterfly plate 9,8 ', spring 6,6 ' respectively are installed in spring seat 8,8 ' on, spring last item 5,5 ' respectively compress and are installed on the spring 6 spring seat 8,8 ' respectively are pressed on the upper and lower sides plane of eccentric cam 12.

Usefulness of the present utility model is: be provided with eccentric cam on the main valve stem, can not only drive the butterfly plate moving linearly, make the butterfly plate contact and break away from valve body sealing surface, two sealing pairs do not interfere when butterfly plate rotates, reduce the scratch of sealing surface, and the butterfly plate sealing surface applied sealing force, and having improved the sealability of butterfly valve, the sealing force that eccentric cam applies can make butterfly valve be issued to sealing in two-way piezodielectric operating mode; Butterfly plate sealing surface and valve body sealing surface are the plane, have the characteristics of stop valve sealing, and sealing is reliable, and design and processing are simple; Be provided with spring mechanism on the butterfly plate, overcome the hydrodynamic(al) moment of butterfly plate, can make main valve stem drive butterfly plate and do 90 ° reversible rotatablely moving, realize the opening and closing of butterfly valve.

Description of drawings

Fig. 1 is a main pseudosection of the present utility model, Fig. 2 is the left pseudosection of Fig. 1, Fig. 3, Fig. 4, Fig. 5 are the A-A of Fig. 2 to sectional view, Fig. 3 is that butterfly plate is at the closed position schematic representation, Fig. 4 is the certain eccentric distance of butterfly plate straight line motion, butterfly plate breaks away from the schematic representation of valve body sealing surface, and Fig. 5 is the butterfly plate half-twist, arrives the schematic representation of enable possition.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1 and Figure 2, butterfly valve of the present utility model is mainly by drive unit 1, Gland 2, valve gap 3, positioning plate 4, spring last item 5,5 ', spring 6,6 ', auxiliary valve rod 7,7 ', spring seat 8,8 ', butterfly plate 9, main valve stem 10, valve body 11, eccentric cam 12, constantbreadth cam groove 13, guiding groove 14, filler 15 compositions such as grade.Gland 2 is installed on the valve gap 3, main valve stem 10 passes the axis hole of Gland 2, main valve stem 10 is around axes O O ' rotation, valve gap 3 is connected with valve body 11 usefulness flanges, Gland 2 compresses filler 15, with main valve stem 10 and valve gap 3 sealings, one of the position installation that is arranged in valve pocket on main valve stem 10 can be at the eccentric cam 12 of constantbreadth cam groove 13 motions, at the symmetrical respectively auxiliary valve rod 7 of installing of the upper and lower end of butterfly plate 9,7 ', auxiliary valve rod 7,7 ' the outer end embed the guiding groove 14 that positioning plate 4 and valve body 11 inner bottom parts are offered respectively, 14 ' in, the upper and lower sides of corresponding eccentric cam 12 is offered spring seat 8 respectively on butterfly plate 9,8 ', spring 6,6 ' respectively are installed in spring seat 8,8 ' on, spring last item 5,5 ' respectively compress and are installed on the spring 6 spring seat 8,8 ' respectively are pressed on the upper and lower sides plane of eccentric cam 12.

As shown in Figure 3, for butterfly plate 9 at the closed position structural drawing, the sealing surface of the sealing surface of valve body 11 and butterfly plate 9 has an eccentric distance.As shown in Figure 4, the eccentric cam 12 on the main valve stem 10 drives butterfly plate 9 moving linearlies, and butterfly plate 9 moves an eccentric distance, and the sealing surface of the sealing surface of butterfly plate 9 and valve body 11 breaks away from, the guiding groove 14 that auxiliary valve rod 7 breaks away from the positioning plate 4.As shown in Figure 5, main valve stem 10 reaches spring seat 8,8 ' drive butterfly plate 9 rotations that compress with eccentric cam 12 by eccentric cam 12, realizes the unlatching of butterfly valve.

As shown in Figure 4, for butterfly plate 9 at the enable possition structural drawing, main valve stem 10 by eccentric cam 12 and with spring seat 8,8 ' drive butterfly plate 9 counterrotatings that eccentric cam 12 compresses, make the sealing surface of valve body 11 and the sealing surface of butterfly plate 9 be in parallel position.As shown in Figure 3, main valve stem 10 is rotated further, be installed in spring seat 8,8 ' drive butterfly plate 9 rotations of eccentric cam 12 on the main valve stem 10 by compressing with it, guiding

groove

14,14 on the positioning plate 4 of auxiliary valve rod 7,7 ' enter ' in, guiding butterfly plate 9 moving linearlies, the sealing surface of butterfly plate 9 contacts with the sealing surface of valve body 11, realizes closing of butterfly valve, makes butterfly valve seal.

Claims

1. butterfly valve, Gland (2) is installed on the valve gap (3), main valve stem (10) passes the axis hole of Gland (2), main valve stem (10) rotates around axis (OO '), valve gap (3) is connected with flange with valve body (11), Gland (2) compresses filler (15), with main valve stem (10) and valve gap (3) sealing, an eccentric cam (12) that can move at constantbreadth cam groove (13) is installed in the position that it is characterized in that being arranged in valve pocket on main valve stem (10), at the symmetrical respectively auxiliary valve rod (7 of installing of the upper and lower end of butterfly plate (9), 7 '), auxiliary valve rod (7,7 ') the outer end embed the guiding groove (14 that positioning plate (4) and valve body (11) inner bottom part are offered respectively, 14 ') in, go up the upper and lower sides of corresponding eccentric cam (12) at butterfly plate (9) and offer spring seat (8 respectively, 8 '), spring (6,6 ') be installed in spring seat (8 respectively, 8 ') on, spring last item (5,5 ') compress respectively and be installed on the spring (6) spring seat (8,8 ') be pressed on respectively on the upper and lower sides plane of eccentric cam (12).

2. butterfly valve according to claim 1 is characterized in that the sealing surface of valve body (11) and the sealing surface of butterfly plate (9) have an eccentric distance, and its eccentric distance is not interfered at butterfly plate (9) energy of rotation assurance butterfly plate (9) and valve body (11) sealing surface.

3. butterfly valve according to claim 1, it is characterized in that main valve stem (10) rotation, under the leading role of auxiliary valve rod (7), eccentric cam (12) on the main valve stem (10) drives butterfly plate (9) moving linearly, the sealing surface of the sealing surface of butterfly plate (9) and valve body (11) breaks away from, butterfly plate (9) moves certain eccentric distance, auxiliary valve rod (7) breaks away from the guiding groove (14) on the positioning plate (4), main valve stem (10) reaches the spring seat (8,8 ') that compresses with eccentric cam (12) by eccentric cam (12) and drives butterfly plate (9) rotation, realizes the unlatching of butterfly valve; Main valve stem (10) rotation drives butterfly plate (9) counterrotating, make the sealing surface of valve body (11) and the sealing surface of butterfly plate (9) be in parallel position, main valve stem (10) is rotated further, the eccentric cam (12) that is installed on the main valve stem (10) drives butterfly plate (9) motion by the spring seat (8,8 ') that compresses with it, auxiliary valve rod (7) enters in the guiding groove (14,14 ') on the positioning plate (4), guiding butterfly plate (9) moving linearly, the sealing surface of butterfly plate (9) contacts with the sealing surface of valve body (11), realize closing of butterfly valve, make butterfly valve seal.