CN219388648U - Butterfly valve and water turbine - Google Patents

Abstract

The application provides a butterfly valve and hydraulic turbine relates to pumped storage technical field for improve because of maintenance sealed vice drive structure is complicated, to the high problem of drive water source requirement. The butterfly valve includes: the valve body is provided with a preset hole, an avoidance hole and a through-flow space, and the through-flow space is arranged on one side of the preset hole; the butterfly plate is rotationally arranged in the valve body and positioned in the through-flow space and used for opening or closing the through-flow space; the movable sealing component is positioned at one side of the avoidance hole, one side of the movable sealing component, which is away from the avoidance hole, is in sealing abutting joint with the butterfly plate, and the movable sealing component moves towards the avoidance hole along with the rotation of the butterfly plate; and the locking part is inserted into the preset hole in a sliding way, so that the locking part extends to the outside of the preset hole and is abutted with the movable sealing part, or the locking part is retracted into the preset hole towards one end of the movable sealing part.

Description

Butterfly valve and water turbine

Technical Field

The application relates to the technical field of pumped storage, in particular to a butterfly valve and a water turbine.

Background

In a pumped storage power station, a water inlet valve of a water turbine is mainly in the form of a ball valve, a rotating arm is arranged at the end of a valve shaft in the ball valve, the rotation of the valve is driven by a servomotor, a piston in a cylinder drives a push-pull rod of the rotating arm, and the push-pull rod drives the valve to rotate by pushing and pulling the rotating arm. However, for some low head turbines, butterfly valves are commonly used, in which the part of the butterfly valve that blocks the flow of fluid is changed from a valve to a butterfly plate, and the valve body is changed from a ball to a cylinder. The maintenance sealing pair of the existing water turbine water inlet butterfly valve is generally driven by a water pressure system, has a complex driving structure, has high requirement on a driving water source, and is not beneficial to long-term use of the maintenance sealing pair.

Disclosure of Invention

In view of this, this application provides a butterfly valve and hydraulic turbine for improve and overhaul sealed vice drive structure complicacy, to the high problem of water source requirement.

The technical scheme adopted for solving the technical problems is as follows:

in a first aspect, the present application provides a butterfly valve and water turbine, the butterfly valve comprising:

the valve body is provided with a preset hole, an avoidance hole and a through-flow space, and the through-flow space is arranged on one side of the preset hole;

the butterfly plate is rotationally arranged in the valve body and positioned in the through-flow space and used for opening or closing the through-flow space;

the movable sealing component is positioned at one side of the avoidance hole, one side of the movable sealing component, which is away from the avoidance hole, is in sealing abutting joint with the butterfly plate, and the movable sealing component moves towards the avoidance hole along with the rotation of the butterfly plate;

and the locking part is inserted into the preset hole in a sliding way, so that the locking part extends to the outside of the preset hole and is abutted with the movable sealing part, or the locking part is retracted into the preset hole towards one end of the movable sealing part.

In some embodiments of the present application, the butterfly valve has a valve-open state and a valve-closed state;

when the butterfly valve is switched from the valve closing state to the valve opening state, the locking part retreats into the preset hole towards one end of the movable sealing part, and the butterfly plate rotates towards the movable sealing part and pushes the movable sealing part to move towards the avoidance hole;

when the butterfly valve is switched from the valve opening state to the valve closing state, one side of the movable sealing component, which is away from the avoidance hole, is in sealing abutting joint with the butterfly plate, the butterfly plate stops rotating, the locking component is inserted into the preset hole in a sliding mode and extends to the outside of the preset hole to be in abutting joint with the movable sealing component, and the part, which is in abutting joint with the movable sealing component, of the locking component is located between the movable sealing component and the avoidance hole.

In some embodiments of the present application, the movable sealing member includes a sealing portion and a limiting member, the sealing portion is located between the valve body and the butterfly plate and one side of the sealing portion is in sealing abutment with the butterfly plate, the other side is in sealing abutment with the valve body, the limiting member with the sealing portion faces towards one side of the avoidance hole and is detachably connected, and the limiting member is inserted into the avoidance hole along with rotation of the butterfly plate.

In some embodiments of the present application, a contact surface between the sealing portion and the valve body is provided with a plurality of sealing positions, and a first sealing member is disposed in the sealing positions and is in sealing contact with the valve body.

In some embodiments of the present application, a second seal is provided on one side of the butterfly plate, and a side of the movable seal member facing away from the locking member is in sealing abutment with the second seal.

In some embodiments of the present application, a third sealing element is disposed on a side of the butterfly plate facing away from the second sealing element, and the third sealing element is in sealing abutment with a side of the valve body facing away from the movable sealing element.

In some embodiments of the present application, an extension line of the axial direction of the preset hole intersects with an extension line of the axial direction of the avoidance hole.

In some embodiments of the present application, the butterfly valve further includes a detection component, a detection hole site is provided in the valve body, the detection hole site is communicated with the avoidance hole, and the detection component is provided in the detection hole site and detects whether the movable sealing component exists in the avoidance hole.

In some embodiments of the present application, the detection component is an electromagnetic sensor or a laser sensor, and a detection end of the electromagnetic sensor or the laser sensor is disposed towards the avoidance hole.

In a second aspect, the present application provides a hydraulic turbine comprising a butterfly valve as described in the first aspect.

In summary, due to the adoption of the technical scheme, the application at least comprises the following beneficial effects:

the butterfly valve and the hydraulic turbine that this application provided mainly realize spacing and stepping down to movable sealing part through utilizing locking part for movable sealing part can be when the butterfly plate rotates towards dodging the hole and remove, do not disturb the rotation of butterfly plate, and when the butterfly plate is static, locking part can form spacingly to movable sealing part, makes form the butt between movable sealing part and the butterfly plate, avoids the butterfly plate to rock. To the spacing of butterfly plate with step down, all need not to use hydraulic system drive, avoided the drive structure complicated, to the high problem of drive water source requirement, can also effectively realize the rotation and the spacing of butterfly plate through simple structure.

Drawings

For a clearer description of an embodiment of the present application, reference will be made to the accompanying drawings of embodiments, which, as will become apparent, relate only to some embodiments of the present application and are not limiting of the present application, wherein:

fig. 1 is a schematic perspective view of a butterfly valve according to an embodiment of the disclosure;

FIG. 2 is a schematic cross-sectional view of section A-A of FIG. 1;

FIG. 3 is a schematic diagram of a front view of a butterfly valve according to an embodiment of the disclosure;

FIG. 4 is a schematic cross-sectional view of portion B-B of FIG. 3.

Reference numerals illustrate:

1. a valve body; 11. presetting a hole; 12. avoidance holes; 13. detecting hole sites; 2. a butterfly plate; 3. a movable sealing member; 31. a limiting piece; 32. a seal; 4. a locking member; 5. a first seal; 6. a second seal; 7. a third seal; 8. and a detection part.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. Based on the embodiments herein, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of the present application.

In the description of the present application, it should be understood that the words "first" and "second" are used for descriptive purposes only and are not to be interpreted as indicating or implying a relative importance or number of features in which such is indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as exemplary is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

The content of the present application is mainly related to pumped storage power stations, and for convenience of understanding, the following description will be given for a brief description of some basic content of the pumped storage power stations:

different from a hydroelectric power station, a water pump and a water turbine of the water pump power station are frequently switched between a water wheel working state and a water pump working state, and water inflow is closed when the water pump and the water turbine are switched between running states and started; the water intake must also be shut down when participating in phase-modulated operation of the grid. Therefore, the water pump turbine must have a flexible and reliable valve to control the water inlet, and the water inlet valve is an important device matched with the water pump turbine. The water inlet valve of the water pump turbine is mainly in the form of a ball valve, and a valve in the ball valve is a valve for opening or closing water flow. The valve is spherical, a through hole is arranged in the middle of the valve, and shafts are arranged on two sides of the valve. The valve is installed in the valve body, and the valve body comprises two halves, and every half is half hemispherical, and there is the through-hole connecting tube bottom, and the front end hole is connected upstream inlet tube, and the rear end valve body passes through telescopic joint and connects the spiral case inlet tube of hydraulic turbine. The two half valve bodies are connected into a sphere. The inner ball space is provided with a valve which can freely rotate in the valve body, so that the water flow is turned off and on. In addition to ball valves, butterfly valves are also used, which are commonly used in low head water turbines, and the valve body is changed from spherical to cylindrical compared to a butterfly plate by changing the valve member that blocks the flow of fluid from the ball valve. The butterfly valve is also called as a flap valve, is a regulating valve with a simple structure, and can be used for the on-off control of low-pressure pipeline media, wherein a closing member (a valve clack or a butterfly plate) is a disc and rotates around a valve shaft to realize opening and closing; the valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like; the butterfly valve opening and closing member is a disc-shaped butterfly plate which rotates around the axis of the butterfly valve body in the valve body, so that the purpose of opening and closing or adjusting is achieved.

The maintenance sealing pair of the water inlet butterfly valve of the existing double-sealing water turbine is generally driven by a water pressure system, the requirement on a water source is high, the used pressure water is generally provided by a high-pressure pump and a water system control cabinet, a clean water source with good water quality is generally adopted after water in a pressure steel pipe in front of a valve is filtered, and once the water quality of the filtered water source can not meet the requirement, scale can be generated in the maintenance sealing system. After scale is generated, the O-shaped rubber sealing ring on the piston ring of the overhauling sealing pair is easy to damage and cause leakage in the operation process, and the overhauling sealing pair cannot be driven.

For this reason, referring to fig. 1 to 4, the present application provides a butterfly valve that can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media, not only in a hydraulic turbine, but also in any parts that need to be used for fluid break-up control. In this application, the butterfly valve is mainly used for the hydraulic turbine, and the structure of this butterfly valve also matches with the hydraulic turbine installation that corresponds. A detailed description of a butterfly valve is provided herein below:

referring to fig. 1 to 4, a butterfly valve includes:

the valve comprises a valve body 1, wherein the valve body 1 is provided with a preset hole 11, an avoidance hole 12 and a through-flow space, and the through-flow space is arranged on one side of the preset hole 11 and the avoidance hole 12;

the butterfly plate 2 is rotatably arranged in the valve body 1 and positioned in the through-flow space, and is used for opening or closing the through-flow space;

the movable sealing component 3 is positioned at one side of the avoidance hole 12, one side of the movable sealing component 3 away from the avoidance hole 12 is in sealing abutting joint with the butterfly plate 2, and the movable sealing component 3 moves towards the avoidance hole 12 along with the rotation of the butterfly plate 2;

the locking component 4 is slidably inserted into the preset hole 11, so that the locking component 4 extends to the outside of the preset hole 11 and abuts against the movable sealing component 3, or the locking component 4 is retracted into the preset hole 11 towards one end of the movable sealing component 3.

According to the technical scheme, the preset hole 11 and the avoidance hole 12 are formed in the valve body 1, the movable sealing component 3 is arranged on one side of the avoidance hole 12, the locking component 4 is inserted into the preset hole 11 in a sliding mode, so that the locking component 4 extends to the outside of the preset hole 11 and abuts against the movable sealing component 3, when the locking component 4 abuts against the movable sealing component 3, one side, away from the locking component 4, of the movable sealing component 3 abuts against the butterfly plate 2, and the purpose of limiting rotation of the butterfly plate 2 is achieved; the butterfly plate 2 is rotated, the locking part 4 is retracted into the preset hole 11 towards one end of the movable sealing part 3, the butterfly plate 2 can push the movable sealing part 3 to move towards the avoidance hole 12, a part of the movable sealing part 3 is positioned in the avoidance hole 12, a yielding path is avoided for rotation of the butterfly valve, and the movable sealing part 3 is prevented from interfering rotation of the butterfly plate 2. Through the cooperation between above-mentioned each part and the structure, realize the vice automatic drive of maintenance seal of butterfly valve, in whole drive process, need not to use any hydraulic system, purely lean on basic mechanical structure cooperation to realize, simple structure also need not extra drive water source, also can not appear because of the water source quality is bad, leads to maintenance seal vice interior deposit incrustation scale etc., leads to the unable normal work's of maintenance seal pair of follow-up butterfly valve condition yet.

In some embodiments, the butterfly valve has a valve-open state and a valve-closed state. The working process and principle of the specific mechanical structure are described in detail below when the butterfly valve is in the valve opening state and the valve closing state respectively:

when the butterfly valve is switched from the valve closing state to the valve opening state, the locking part 4 retreats to the preset hole 11 towards one end of the movable sealing part 3, so that the locking part 4 is not contacted with the movable sealing part 3, and the blocking of the movable sealing part 3 by the locking part 4 is avoided; the butterfly plate 2 rotates towards the movable sealing part 3 and pushes the movable sealing part 3 to move towards the avoidance hole 12, the butterfly plate 2 rotates, the butterfly valve is opened, the butterfly valve is in a valve opening state for fluid, such as water to pass through, and the rotation of the butterfly plate 2 can push the movable sealing part 3 to move towards the avoidance hole 12, so that part of the movable sealing part 3 enters into the avoidance hole 12, the movable sealing part 3 rotates for the butterfly plate 2 to avoid a path for rotation of the butterfly plate, and rotation interference cannot be generated.

When the butterfly valve is switched from the valve opening state to the valve closing state, one side of the movable sealing part 3 deviating from the avoidance hole 12 is in sealing abutting joint with the butterfly plate 2, and the butterfly plate 2 stops rotating, the movable sealing part 3 is in sealing abutting joint with the butterfly plate 2, so that the effects of preventing the butterfly plate 2 from rotating and sealing are achieved, and leakage of fluid through gaps between the butterfly plate 2 and the movable sealing part 3 is avoided. The locking part 4 is slidably inserted into the preset hole 11 and extends to the outside of the preset hole 11 to be abutted against the movable sealing part 3, and the portion of the locking part 4 abutted against the movable sealing part 3 is positioned between the movable sealing part 3 and the avoidance hole 12, so that the movable sealing part 3 is positioned between the butterfly plate 2 and the locking part 4 and is fixed by the locking part 4 and the butterfly plate 2, and relatively, the movable sealing part 3 also plays a role in limiting rotation of the butterfly plate 2.

In some embodiments, the movable sealing member 3 includes a sealing portion 32 and a stopper 31. The seal portion 32 is located between the valve body 1 and the butterfly plate 2, and one side of the seal portion 32 is in sealing contact with the butterfly plate 2, and the other side is in sealing contact with the valve body 1. The sealing part 32 is in sealing abutting connection with the butterfly plate 2 and the valve body 1 and surrounds the butterfly plate 2 in the circumferential direction for one circle so as to form a sealing arrangement between the butterfly plate 2 and the valve body 1, and fluid is prevented from entering the valve body 1 or flowing out of the valve body 1. The limiting piece 31 and the sealing portion 32 are detachably connected towards one side of the avoidance hole 12, the detachable connection can be threaded connection, clamping connection and the like, and the embodiment adopts threaded connection, so that the connection effect is better and more stable. And the limiting piece 31 is inserted into the avoidance hole 12 along with the rotation of the butterfly plate 2, and is connected with the sealing part 32 by utilizing the limiting piece 31, so that when the sealing part 32 is pushed by the butterfly valve, the limiting piece 31 also moves towards the inside of the avoidance hole 12 along with the rotation of the butterfly valve, and thus enters into the avoidance hole 12 to provide a certain supporting effect for the sealing part 32, and meanwhile, the sealing part 32 also does not prevent the continued rotation of the butterfly plate 2, so that the butterfly plate 2 is converted from a vertical state to a horizontal state.

Further, a contact surface of the sealing portion 32 in sealing contact with the valve body 1 is provided with a plurality of sealing positions. A first sealing piece 5 is arranged in each sealing position, and the first sealing piece 5 is in sealing abutting connection with the valve body 1, so that a sealing effect is achieved. The specific location of the seal locations is determined by the specific configuration of the seal. In this embodiment, since the sealing member has three planes with different heights and is in abutting contact with the valve body 1, sealing positions are formed on the three planes with different heights, the sealing positions adapt to the shape structure of the sealing member, the shape of the sealing member is annular, and therefore the sealing positions are formed in an annular shape around the axial direction of the sealing member. The plurality of first sealing elements 5 are respectively arranged in the plurality of corresponding sealing positions to realize the sealing effect. The sealing position is specifically in a circular groove shape, and the first sealing piece 5 is a rubber sealing ring matched with the shape and the size of the sealing groove.

In some embodiments, one side of the butterfly plate 2 is provided with a second seal 6. Wherein, the side that the movable sealing part 3 deviates from locking part 4 seals the butt with second sealing member 6, through utilizing movable sealing part 3 and second sealing member 6 butt, ensures when butterfly plate 2 is in quietly, and the butterfly valve is in the valve state of closing, can have better sealed effect between movable sealing part 3 and the second sealing member 6, avoids water or other fluid leakage that need seal. The sealing contact between the side of the movable sealing member 3 facing away from the locking member 4 and the second sealing member 6 refers to a structural relationship between the movable sealing member 3 and the second sealing member 6 of the butterfly plate 2 when the butterfly valve is in the valve-closed state, and when the butterfly valve is in the valve-open state, a part of the movable sealing member 3 may move to the avoidance position to avoid rotation of the butterfly plate 2 because the movable sealing member 3 prevents rotation of the butterfly plate 2, and the portion of the butterfly plate 2 where the second sealing member 6 and the movable sealing member 3 originally contact may be separated from each other. And, it should be noted that, the butterfly plate 2 is circular, the second sealing member 6 is disposed along the circumferential direction of the butterfly plate 2, and the manner of disposition is that a groove corresponding to the second sealing member 6 is formed in the circumferential direction of the butterfly plate 2, the second sealing member 6 is embedded into the groove, and the second sealing member 6 may be a rubber sealing ring.

In some embodiments, the side of the butterfly plate 2 facing away from the second seal 6 is provided with a third seal 7. The third seal 7 is in sealing contact with the side of the valve body 1 remote from the movable seal member 3. In detail, the two sides of the butterfly plate 2 are provided with grooves for placing sealing elements, wherein the second sealing element 6 is placed on one side, and the third sealing element 7 is placed on the other side, so that the two sides of the butterfly plate 2 have good sealing effects respectively. The sealing abutment of the third seal 7 with the side of the valve body 1 remote from the movable seal member 3 is similar in structure to the abutment seal between the second seal 6 and the movable seal member 3 described above. Specifically, only when the butterfly valve is in the valve-closing state and the butterfly plate 2 is at rest, the third sealing member 7 is in sealing abutment with the valve body 1, and at this time, leakage of water from the contact between the butterfly plate 2 and the valve body 1 is mainly prevented; when the butterfly valve is in the valve-opening state, the butterfly plate 2 is in the rotating state, the third sealing element 7 is separated from contact with the valve body 1, and the butterfly valve is not in sealing contact with the valve body naturally. And, it should be noted that the third sealing member 7 may be a rubber sealing ring, and similarly, a groove for placing the third sealing member 7 is also formed circumferentially around the butterfly plate 2.

In some embodiments, the extension of the axial direction of the preset hole 11 intersects the extension of the axial direction of the relief hole 12. By limiting the intersection of the extension line of the axial direction of the preset hole 11 and the extension line of the axial direction of the avoidance hole 12, when the locking part 4 is inserted into and extended from the preset hole 11 along the preset hole 11, the part of the locking part 4 extending out of the preset hole 11 can be positioned on the extension line of the axial direction of the avoidance hole 12, so that the movable sealing part 3 can be interfered by the locking part 4 when moving towards the avoidance hole 12, and the movable sealing part 3 is limited.

More specifically, in the present embodiment, the extension line of the axial direction of the preset hole 11 is perpendicular to the extension line of the axial direction of the escape hole 12, so that the locking member 4 can be better inserted and extended out of the preset hole 11, and a limit with a wider contact area is formed for the movable sealing member 3 moving toward the escape hole 12.

In some embodiments, the butterfly valve further comprises a detection member 8. Wherein, valve body 1 has seted up and has detected hole site 13, and detection hole site 13 and dodge hole 12 intercommunication, and detection part 8 locates in detection hole site 13 to whether dodge hole 12 has movable sealing part 3 to detect. Through setting up detection part 8, mainly be used for detecting and dodging whether there is the entering of movable sealing part 3 in the hole 12, its detection part 8 can be for adopting electromagnetic sensor, utilizes electromagnetic induction principle to realize the detection of whether movable sealing part 3 gets into dodging the hole 12, also can be for adopting laser sensor, utilizes the laser reflection principle to realize the detection of whether movable sealing part 3 gets into dodging the hole 12, does not do specifically limit. And, through communicating detection hole site 13 with dodging hole 12, more be favorable to detecting part 8 to the detection of corresponding position department.

Further, the detection end of the detection part 8 is arranged towards the avoidance hole 12, and the extension line of the axial direction of the avoidance hole 12 is perpendicular to the extension line of the axial direction of the detection hole 13, and the direction of the detection end of the detection part 8 is naturally perpendicular to the extension line of the axial direction of the avoidance hole 12, so that whether the detection part 8 has the movable sealing part 3 in the avoidance hole 12 or not is more facilitated.

The application also provides a water turbine, which comprises the butterfly valve in any one of the embodiments, and has the beneficial effects corresponding to any one of the embodiments, so that the description is omitted.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the present application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within this application, and are therefore within the spirit and scope of the exemplary embodiments of this application.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the present application may be combined as suitable.

Likewise, it should be noted that in order to simplify the presentation disclosed herein and thereby aid in understanding one or more application embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure. This method of disclosure, however, is not intended to imply that more features than are presented in the claims are required for the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this application, the entire contents of which are hereby incorporated by reference into this application, except for the application history documents which are inconsistent or conflict with the contents of this application, and for documents which have limited the broadest scope of the claims of this application (currently or hereafter attached to this application). It is noted that the descriptions, definitions, and/or terms used in the subject matter of this application are subject to the use of descriptions, definitions, and/or terms in case of inconsistent or conflicting disclosure.

Claims (10)

1. A butterfly valve, the butterfly valve comprising:

the valve body is provided with a preset hole, an avoidance hole and a through-flow space, and the through-flow space is arranged on one side of the preset hole;

the butterfly plate is rotationally arranged in the valve body and positioned in the through-flow space and used for opening or closing the through-flow space;

the movable sealing component is positioned at one side of the avoidance hole, one side of the movable sealing component, which is away from the avoidance hole, is in sealing abutting joint with the butterfly plate, and the movable sealing component moves towards the avoidance hole along with the rotation of the butterfly plate;

and the locking part is inserted into the preset hole in a sliding way, so that the locking part extends to the outside of the preset hole and is abutted with the movable sealing part, or the locking part is retracted into the preset hole towards one end of the movable sealing part.

2. The butterfly valve of claim 1, wherein the butterfly valve has an open state and a closed state;

when the butterfly valve is switched from the valve closing state to the valve opening state, the locking part retreats into the preset hole towards one end of the movable sealing part, and the butterfly plate rotates towards the movable sealing part and pushes the movable sealing part to move towards the avoidance hole;

when the butterfly valve is switched from the valve opening state to the valve closing state, one side of the movable sealing component, which is away from the avoidance hole, is in sealing abutting joint with the butterfly plate, the butterfly plate stops rotating, the locking component is inserted into the preset hole in a sliding mode and extends to the outside of the preset hole to be in abutting joint with the movable sealing component, and the part, which is in abutting joint with the movable sealing component, of the locking component is located between the movable sealing component and the avoidance hole.

3. The butterfly valve of claim 1, wherein the movable seal member includes a seal portion and a stopper, the seal portion is located between the valve body and the butterfly plate, one side of the seal portion is in sealing abutment with the butterfly plate, the other side is in sealing abutment with the valve body, the stopper is detachably connected with one side of the seal portion facing the escape hole, and the stopper is inserted into the escape hole as the butterfly plate rotates.

4. The butterfly valve of claim 3, wherein a plurality of sealing locations are provided on a contact surface of the sealing portion in sealing abutment with the valve body, and a first sealing element is provided in the sealing locations and in sealing abutment with the valve body.

5. The butterfly valve of claim 1, wherein a side of the butterfly plate is provided with a second seal, and a side of the movable seal member facing away from the locking member is in sealing abutment with the second seal.

6. The butterfly valve of claim 5, wherein a third seal is disposed on a side of the butterfly plate facing away from the second seal, the third seal in sealing abutment with a side of the valve body facing away from the movable seal member.

7. The butterfly valve of claim 1, wherein an extension of the axial direction of the pre-set bore intersects an extension of the axial direction of the relief bore.

8. The butterfly valve of claim 1, further comprising a detection member, wherein the valve body defines a detection aperture, wherein the detection aperture communicates with the relief aperture, and wherein the detection member is disposed within the detection aperture and detects the presence or absence of the movable seal member within the relief aperture.

9. The butterfly valve of claim 8, wherein the detection component is an electromagnetic sensor or a laser sensor, the detection end of which is disposed toward the relief aperture.

10. A hydraulic turbine comprising a butterfly valve according to any one of claims 1 to 9.