CN202852006U

CN202852006U - Butterfly valve

Info

Publication number: CN202852006U
Application number: CN 201220412762
Authority: CN
Inventors: 袁邦; 陈凌凯
Original assignee: China Valves Technology Changsha Co Ltd
Current assignee: China Valves Technology Changsha Co Ltd
Priority date: 2012-08-20
Filing date: 2012-08-20
Publication date: 2013-04-03
Anticipated expiration: 2022-08-20

Abstract

The utility model discloses a butterfly valve which comprises a valve body, a butterfly plate, a valve shaft, an operating mechanism, a seal pair and a pressure fluid supply means, wherein the butterfly plate is installed inside the valve body, the valve shaft is connected with the butterfly plate through the valve body, the operating mechanism is arranged at the outer portion of the valve body and connected with the outer portion of the valve shaft, and the seal pair is arranged at the inner portion of the valve body along the inner wall of the valve body. At least one seal pair comprises a seal ring and a platen, wherein the seal ring is fixed on the inner wall of the valve body and forms a pressure self seal ring seal structure, the seal ring is provided with an opening structure, a cavity is formed among the seal ring and the valve body and the platen, a hole channel which is capable of enabling pressure fluid to be injected into the cavity is formed in the cavity, and the pressure fluid supply means supplies the pressure fluid for the cavity. According to the butterfly valve, a turbine inlet valve can automatically control the amount of compression of the seal ring without the need for a compression air support provided by a compressor, and a control of self sealing is needed through a pressure medium which is provided by the inner or the outer portion of a pipeline. The butterfly valve can be used for the turbine inlet valve and also can be used as a pipeline butterfly valve with a large caliber.

Description

A kind of butterfly valve

Technical field

The utility model relates to a kind of butterfly valve.

Background technique

Along with socioeconomic development, the demand of electric energy is increased day by day, hydroelectric power plant is just being brought into play more and more important effect.Water turbine can be with the mechanical energy of transformation of energy for rotating of current, output torque, thus drive the generator generating, be the visual plant of hydroelectric power plant.Inlet valve blocks the valve of current as inlet, is the critical component in the water turbine, to the performance important of water turbine.

In the prior art, the hydroturbine water intake valve system comprises main valve, Oil pump electrical machinery group, hydraulic operating mechanism and bypass valve, is installed on the front penstock of water power plant or pumped storage power station spiral case inlet.When water turbine need to overhaul, close inlet valve, block hydroturbine water intake; When water wheels unit speed control system breaks down, generating unit speed is elevated in the situation of setting valve, and active water promptly closes valve, prevents that water turbine from flying ease, and the deduction and exemption water hammer guarantees unit safety.Usually, main valve is selected butterfly valve, the angular motion of butterfly valve in can 90 ° by butterfly plate, the fluid that will flow through be controlled at without flow and maximum fluidity between.For preventing fluid leaks, need to carry out encapsulation process, for butterfly valve, especially large-diameter butterfly valve, its sealing means is according to the difference of sealing ring material, be divided into soft seal and metal hard sealing structure, the seal diameter of these two kinds of structures all greater than the diameter of the corresponding matching part of sealing seat, provides initial sealing specific pressure (or claiming decrement) by interference fit, thereby realizes sealing.

When realizing sealing by interference fit, seal ring all constantly extrusion-deformation and wear out failure in switching process, the friction torque of Simultaneous Switching process is very large, opens and closes difficulty, needs large-scale transmission system that the driving moment of switch valve is provided.Simultaneously, the seal compression of seal ring is limited in the less scope, and can't compensate the valve body butterfly plate larger resiliently deformable under pressure of large-diameter butterfly valve, cause the high pressure sealing performance of large-diameter butterfly valve relatively poor or require the rigidity of valve body butterfly plate very high, the resiliently deformable of its permission is very little.

Therefore, providing a kind of butterfly valve of decrement that can the ACTIVE CONTROL seal ring is the technical problem that those skilled in the art need solution badly.

The model utility content

The purpose of this utility model provides a kind of butterfly valve, it can carry out ACTIVE CONTROL to the decrement of seal ring, the pressurized air support that does not need compressor to provide only needs to carry out self-packing control by medium identical in the pipeline or in outside that provide and the pipeline after through pressurization.

To achieve these goals, the utility model provides a kind of butterfly valve, comprise butterfly valve, wherein, described butterfly valve includes valve body 1, butterfly plate 2, valve shaft 6, operating device 4, sealing pair 3, and butterfly plate 2 is housed in the valve body 1, valve shaft 6 is connected with butterfly plate 2 by valve body 1, operating device 4 is arranged on the outside of valve body 1 and is connected in the outside of valve shaft 6, and sealing pair 3 is arranged at valve body 1 inside, also comprises the pressure fluid feeding mechanism; At least one sealing pair 3 comprises seal ring 13, pressing plate 11, described seal ring 13 is fixed in valve body 1 inwall place, mineralization pressure pressure sealing ring 13 sealing configurations 7, described seal ring 13 has hatch frame, form cavity 12 between described seal ring 13 and valve body 1, the pressing plate 11, have on the described cavity 12 and can make pressure fluid can inject the duct 8 of described cavity 12; Described pressure fluid feeding mechanism provides pressure fluid to described cavity 12.

Preferably, described valve body 1 inwall is provided with valve seal seat 9, and described valve seal seat 9 is provided with mating groove.

Preferably, described sealing pair 3 also comprises bolt 10, and described bolt 10 compresses described pressing plate 11 and valve seal seat 9, and described seal ring 13 is sealed in described valve seal seat 9 mating grooves by described pressing plate 11.

Preferably, be provided with O RunddichtringO 14 between described pressing plate 11 and the described valve seal seat 9.Described pressure sealing ring 13 can adopt rubber or high molecule plastic material.

Compared with prior art, butterfly valve provided by the utility model also comprises the pressure fluid feeding mechanism; At least one sealing pair 3 comprises seal ring 13, pressing plate 11, described seal ring 13 is fixed in valve body 1 inwall place, mineralization pressure pressure sealing ring 13 sealing configurations 7, described seal ring 13 has hatch frame, form cavity 12 between described seal ring 13 and valve body 1, the pressing plate 11, have on the described cavity 12 and can make pressure fluid can inject the duct 8 of described cavity 12; Described pressure fluid feeding mechanism provides pressure fluid to described cavity 12; Because described seal ring 13 has hatch frame, therefore, described seal ring 13 and valve body 1, can form cavity 12 between the pressing plate 11, simultaneously, be provided with the duct 8 that can make pressure fluid inject cavity 12 at described cavity 12 peripheries, like this, can introduce pressure fluid and crush seal ring 13 by described pressure fluid feeding mechanism, and can be by the big or small decrement that control seal ring of pressure of the described pressure fluid feeding mechanism control pressure fluid of introducing, and, owing to provide pressure medium to control, the pressure air support that does not need compressor to provide only needs to carry out self-packing control by medium identical in the pipeline or in outside that provide and the pipeline after through pressurization; And can be by regulating pressure control seal ring 13 decrements in the cavity 12, the resiliently deformable that valve body 1 butterfly plate 2 is produced under pressure compensates, thereby on the basis that guarantees high pressure sealing performance, reduces the requirement to valve body 1 butterfly plate 2 rigidity; Further, in the process that butterfly valve opens and closes, can control frictional force between seal ring and butterfly plate 2 outers by the decrement of control seal ring, therefore, the keying of butterfly valve is light, and flexible operation is in a kind of preferably mode of execution, in the process that butterfly valve opens and closes, there is the gap between butterfly plate 2 outers and the seal ring.

Further preferably in the mode of execution, described valve body 1 inwall is provided with valve seal seat 9, described valve seal seat 9 is provided with mating groove, like this, described seal ring is arranged in the described mating groove, and seal ring 13 inside grooves can be set up elastic element according to the needs of design, such as O RunddichtringO 14 etc., by the seal pressure between elastic element control seal ring 13 and sealing seat 9 and the pressing plate 11, the while is gap and the decrement between adjustable sealing ring 13 and butterfly valve 2 outers also.

In mode of execution further preferably, be provided with O RunddichtringO 14, described O RunddichtringO 14 is arranged between described pressing plate 11 and the described valve seal seat 9, prevents the leakage between pressing plate 11 and the described valve seal seat 9.

Description of drawings

Fig. 1 is the plan view of a kind of large-diameter butterfly valve that the utility model proposes;

Fig. 2 is the left view of a kind of large-diameter butterfly valve that the utility model proposes;

Fig. 3 is the enlarged view of the sealing configuration of a kind of large-diameter butterfly valve that the utility model proposes.

Embodiment

In order to make those skilled in the art understand better the technical solution of the utility model; below in conjunction with accompanying drawing the utility model is described in detail; the description of this part only is exemplary and explanatory, should any restriction not arranged to protection domain of the present utility model.

Please refer to Fig. 1, Fig. 2, in one embodiment, a kind of butterfly valve provided by the utility model, comprise pressure fluid control gear, butterfly valve, wherein, described butterfly valve includes valve body 1, butterfly plate 2, valve shaft 6, operating device 4, sealing pair 3, butterfly plate 2 is housed in the valve body 1, valve shaft 6 is connected with butterfly plate 2 by valve body 1, operating device 4 is arranged on the outside of valve body 1 and is connected in the outside of valve shaft 6, feed-water end 5 is arranged on valve body 1 upstream side, and the waterexit end is arranged on valve body 1 downstream side, and sealing pair 3 is arranged at valve body 1 top;

Please in conjunction with reference to figure 3, Fig. 3 is the partial enlarged drawing of sealing pair 3 structures, sealing pair 3 comprises seal ring 13, pressing plate 11, valve seal seat 9, bolt 10, O RunddichtringO, described valve seal seat 9 is arranged at described valve body 1 inwall, described pressing plate 11 and described valve seal seat 9 close contacts, described O RunddichtringO is arranged between described pressing plate 11 and the described valve seal seat 9; Described valve seal seat 9 is provided with the mating groove that can hold described seal ring 13, described seal ring 13 is arranged in the described mating groove, described bolt 10 can compress described pressing plate 11 and valve seal seat 9, so that described seal ring 13 is sealed in described valve seal seat 9 mating grooves by described pressing plate 11; Described seal ring 13 has hatch frame, form cavity 12 between described seal ring 13 and valve body 1, the pressing plate 11, have on the described cavity 12 and can make pressure fluid can inject the duct 8 of described cavity 12, described pressure fluid feeding mechanism provides pressure fluid to described cavity 12.Like this, can be by introducing pressure fluid and crush seal ring 13 from the outside, and can be by the big or small decrement that control seal ring of the pressure of the control pressure fluid of introducing, in the present embodiment, to draw press water from the upstream pressure steel pipe to use by the processing such as filter-press are rear, therefore large-diameter butterfly valve provided by the utility model does not need to provide the support of compressed air system, and the operation operation is simple and reliable.

Further, by regulating the seal ring decrement, can the resiliently deformable that valve body 1 butterfly plate 2 produces under the internal pipe pressure effect be compensated, thereby on the basis that guarantees high pressure sealing performance, reduce the requirement to valve body 1 butterfly plate 2 rigidity.

Further, in the process that butterfly valve opens and closes, can control frictional force between seal ring and butterfly plate 2 outers by the decrement of control seal ring, in the present embodiment, in the process that butterfly valve opens and closes, there is micro-gap between butterfly plate 2 outers and the seal ring, the keying of butterfly valve is light, flexible operation.

Need to prove, the utility model does not limit the mode of introducing pressure fluid, can draw press water from the upstream pressure steel pipe uses by the processing such as filter-press are rear, also can be to adopt the rear use of station-service water source water intaking pressurization in power station to wait other modes, therefore, otherwise obtain pressure fluid and inject described cavity, all should be within protection domain of the present utility model; Simultaneously, the utility model is not to the sealing pair quantity of butterfly valve and adopted the sealing pair quantity of sealing configuration provided by the utility model to limit, therefore, single seal butterfly valve, double seals butterfly valve or many seal butterfly valves, if its one or more sealing pairs have adopted provided by the utility model by introducing this sealing configuration of pressure fluid ACTIVE CONTROL pressure sealing ring, be pressure field control flow field, all should be within the utility model protection domain; The utility model does not limit type and the mode of operating device, therefore, otherwise drive and send out the axle rotation, thereby the control butterfly valve opens and closes, all should be within protection domain of the present utility model.

Used specific case herein principle of the present utility model and mode of execution are set forth, above embodiment's explanation just is used for helping to understand method of the present utility model and core concept thereof.The above only is preferred implementation of the present utility model, should be understood that, for those skilled in the art, under the prerequisite that does not break away from the utility model principle, can also make some improvement, retouching or variation, also above-mentioned technical characteristics can be made up by rights; These improve retouching, change or combination, or without improving the design of model utility and technological scheme are directly applied to other occasion, all should be considered as protection domain of the present utility model.

Claims

1. butterfly valve, include valve body (1), butterfly plate (2), valve shaft (6), operating device (4), sealing pair (3), butterfly plate (2) is housed in the valve body (1), valve shaft (6) is connected with butterfly plate (2) by valve body (1), operating device (4) is arranged on the outside of valve body (1) and is connected in the outside of valve shaft (6), sealing pair (3) is arranged at valve body (1) inside, it is characterized in that, also comprises the pressure fluid feeding mechanism; At least one sealing pair (3) comprises seal ring (13), pressing plate (11), described seal ring (13) is fixed in valve body (1) inwall place, mineralization pressure pressure sealing ring (13) sealing configuration (7), described seal ring (13) has hatch frame, form cavity (12) between described seal ring (13) and valve body (1), the pressing plate (11), have on the described cavity (12) and can make pressure fluid can inject the duct (8) of described cavity (12); Described pressure fluid feeding mechanism provides pressure fluid to described cavity (12).

2. butterfly valve according to claim 1 is characterized in that, described valve body (1) inwall is provided with valve seal seat (9), and described valve seal seat (9) is provided with mating groove.

3. butterfly valve according to claim 2, it is characterized in that, described sealing pair (3) also comprises bolt (10), described bolt (10) compresses described pressing plate (11) and valve seal seat (9), and described seal ring (13) is sealed in described valve seal seat (9) mating groove by described pressing plate (11).

4. hydroturbine water intake valve according to claim 3 is characterized in that, is provided with O RunddichtringO (14) between described pressing plate (11) and the described valve seal seat (9).

5. butterfly valve according to claim 1 is characterized in that, described pressure sealing ring (13) can adopt rubber or high molecule plastic material.