Eccentric expansion butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to an eccentric expansion butterfly valve which comprises a valve body, a circular notch is arranged on the valve body, and a valve plate is concentrically arranged on the valve body corresponding to the circular notch. A valve rod and a driving mechanism are arranged on the valve body, the driving mechanism is used for driving the valve rod to rotate, the valve rod is rotationally connected with the valve body, and the valve rod is fixedly connected with the side vertical face of the valve plate; the expansion mechanism comprises an annular sealing ring and a connector which are communicated, the outer ring of the annular sealing ring is fixedly arranged on the inner wall face of the valve body, the inner ring of the annular sealing ring is arranged on one side of the valve plate in the axial direction, and the connector is used for ventilation or deflation, so that the annular sealing ring is in an expansion state or a contraction state; by means of the technical scheme, the eccentric expansion butterfly valve solves the problem that when an existing eccentric expansion butterfly valve is closed, the sealing effect between the valve plate and the valve rod cannot be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to eccentric expansion butterfly valve, specifically to an eccentric expansion butterfly valve. BACKGROUND

[0002] Expansion butterfly valve is a kind of valve on the basis of traditional butterfly valve, improve sealing performance by increasing expansion device.It combines the compact structure of butterfly valve and expansion sealing technology, can realize better sealing effect under the action of fluid pressure.

[0003] Eccentric expansion butterfly valve is a kind of valve further introducing eccentric design on the basis of expansion butterfly valve.It combines the sealing advantage of expansion butterfly valve and the operation advantage of eccentric butterfly valve, has better sealing performance and lower operation torque.

[0004] Existing eccentric expansion butterfly valve includes single eccentric expansion butterfly valve, double eccentric expansion butterfly valve and three eccentric expansion butterfly valve;Single eccentric expansion butterfly valve refers to the rotation center of valve plate and the geometric center of valve plate in vertical direction exist an eccentricity in butterfly valve;Double eccentric expansion butterfly valve still exists the rotation center of valve plate and the geometric center of valve plate in horizontal direction exist an eccentricity on the basis of single eccentric expansion butterfly valve;Three eccentric expansion butterfly valve is realized through adjusting the shape of valve plate or the shape of valve body flow channel on the basis of double eccentric expansion butterfly valve.

[0005] However, in the existing eccentric expansion butterfly valve, multiple sealing rings, such as soft and hard superimposed sealing rings, are usually arranged in the inner wall surface of the valve body to ensure the sealing between the valve body and the valve plate when the butterfly valve is closed. However, the thermal expansion coefficients of each layer of material are different when the temperature changes, which may cause the gap between the sealing rings to change, thereby affecting the sealing effect. UTILITY MODEL CONTENTS

[0006] The utility model discloses in order to solve the problem in the related technical field, provide a kind of eccentric expansion butterfly valve, the device solves the problem that the sealing effect between valve plate and valve stem cannot be guaranteed when existing eccentric expansion butterfly valve is closed.

[0007] To solve the above problems, the following technical solutions are provided:

[0008] The eccentric expansion butterfly valve comprises a valve body, a circular notch is arranged on the valve body, a valve plate is arranged on the valve body in a concentric manner corresponding to the circular notch, a valve rod and a driving mechanism are arranged on the valve body, the driving mechanism is used for driving the valve rod to rotate, the valve rod and the valve body are rotationally connected, and the side vertical surfaces of the valve rod and the valve plate are fixedly connected; the eccentric expansion butterfly valve is characterized in that the expansion mechanism is further arranged, the expansion mechanism comprises a communicating annular sealing ring and a joint, the outer ring of the annular sealing ring is fixedly arranged on the inner wall surface of the valve body, the inner ring of the annular sealing ring is arranged on one side of the valve plate in the axial direction, and the joint is used for aeration or degassing, so that the annular sealing ring is in an expanded state or a contracted state, and no gap or a gap between the annular sealing ring and the valve plate is realized.

[0009] Through the above technical scheme, when the eccentric expansion butterfly valve needs to be in a closed state, the valve plate is first closed, then the joint is used to fill gas into the annular sealing ring, the annular sealing ring is expanded until there is no gap between the valve plate and the valve body, and the valve plate is in a sealing state; when the eccentric expansion butterfly valve needs to be in an open state, the gas in the annular sealing ring is first discharged, then the valve plate is opened, and the sealing effect between the valve plate and the valve body when the eccentric expansion butterfly valve is closed is ensured, the service life of the annular sealing ring is improved, and the opening frequency and the service life of the eccentric expansion butterfly valve are improved.

[0010] Further, a first notch is arranged on the outer periphery of the valve plate, and the radial length values of the two side vertical surfaces of the valve plate in the axial direction are arranged in a gradually decreasing manner.

[0011] The shape of the inner ring of the annular sealing ring is consistent with the shape of the outer periphery of the valve plate, and the axial length value of the annular sealing ring is greater than the axial length value of the valve plate.

[0012] Through the above technical scheme, when the joint is in the air intake state, the annular sealing ring is expanded to fill the gap between the valve plate and the valve body, and the sealing property of the eccentric expansion butterfly valve is ensured, so that the fluid is effectively isolated.

[0013] Further, the expansion mechanism further comprises a rubber ring skeleton, two ends of the annular sealing ring in the radial direction are respectively provided with third notches, each third notch is arranged at an end of the annular sealing ring away from the valve plate, one end of the rubber ring skeleton in the radial direction is arranged in the third notch, and the two ends of the rubber ring skeleton in the radial direction are respectively provided with first through holes and second through holes, each first through hole penetrates the rubber ring skeleton in the radial direction, each second through hole penetrates the rubber ring skeleton in the radial direction, two first through holes are in communication with two second through holes, and two second through holes are in communication with two joints.

[0014] The side surface of the valve body in the axial direction is provided with a side cover, a fourth gap is arranged in the lower part of the side cover close to one side of the valve body, a fifth gap is arranged in the lower part of the valve body close to one side of the side cover, and the fifth gap and the fourth gap are communicated; the rubber ring skeleton and the annular sealing ring are arranged in the communicated third gap and fourth gap, and the two ends of the rubber ring skeleton and the annular sealing ring in the axial direction are respectively abutted against the valve body and the side cover.

[0015] Through the above technical scheme, through the arrangement of the rubber ring skeleton, the rubber ring skeleton can maintain the relatively stable shape of the annular sealing ring during inflation expansion or exhaust contraction, avoid the generation of the local excessive expansion or collapse of the annular sealing ring when the inflation pressure is uneven or the exhaust speed is fast, and thus ensure that the annular sealing ring can normally work in various working states;

[0016] In addition, the rubber ring skeleton can also guide the gas into or out of the inside of the annular sealing ring, and thus accelerate the expansion or contraction speed of the annular sealing ring, and thus improve the use efficiency of the equipment.

[0017] Further, a plurality of fixing members are arranged on the side surface of the valve plate, each fixing member is provided with a second gap, each second gap penetrates the thickness direction of the corresponding fixing member, and the shape of each second gap is consistent with the shape of the valve rod, so that each fixing member is fixedly sleeved on the valve rod;

[0018] The fixing member comprises a first fixing member and a second fixing member arranged on the side surface of the valve plate in sequence from top to bottom, the first fixing member and the second fixing member are consistent in structure, and the second gaps on the first fixing member and the second fixing member are arranged in a regular hexagonal shape;

[0019] The first fixing member and the second fixing member are provided with a sixth gap, each sixth gap is arranged along the axial direction of the valve plate, and each sixth gap is arranged in a communicated manner with the corresponding second gap;

[0020] The valve rod comprises an upper valve rod and a lower valve rod, the lower part of the upper valve rod and the upper part of the lower valve rod are arranged in a regular hexagonal shape, the driving mechanism is used for driving the upper valve rod to rotate, the other end of the upper valve rod penetrates the valve body and extends into the circular gap, and is fixedly connected with the first fixing member;

[0021] One end of the lower valve rod is arranged in the circular gap and is fixedly connected with the second fixing member, and the other end of the lower valve rod penetrates the valve body and extends out of the valve body.

[0022] By the above technical scheme, the second notch on each fixing piece can increase the contact area with the valve stem, thereby improving the connection stability of the valve stem and the valve plate, and ensuring the reliability of the three-eccentric expanding butterfly valve during use.

[0023] By the arrangement of the upper valve stem and the lower valve stem, the upper valve stem and the lower valve stem can be connected with the first fixing piece and the second fixing piece on the valve plate respectively, thereby simplifying the installation and maintenance process, and reducing the time and labor intensity of installation and maintenance.

[0024] By the arrangement of the matching valve stem and the second notch, the design of the regular hexagon can facilitate the alignment of the position and the angle when the upper valve stem and the first fixing piece or the lower valve stem and the second fixing piece are assembled, thereby reducing the assembly error and improving the assembly accuracy.

[0025] Further, the valve body comprises a valve body, an upper valve pipe body and a lower valve pipe body, the upper valve pipe body and the lower valve pipe body are in communication with the valve body, and the upper valve pipe body and the lower valve pipe body are arranged along the radial direction of the valve body.

[0026] The upper valve stem is arranged in the hollow segment of the upper valve pipe body, and there is a gap between the outer peripheral surface of the upper valve stem and the inner wall surface of the upper valve pipe body, and the lower valve stem is arranged in the hollow segment of the lower valve pipe body, and there is a gap between the outer peripheral surface of the lower valve stem and the inner wall surface of the lower valve pipe body.

[0027] Further, the first shaft sleeve and the second shaft sleeve are arranged in the upper valve pipe body, the first shaft sleeve and the second shaft sleeve are rotatably connected with the upper valve stem and fixedly connected with the upper valve pipe body, the inner diameter of the first shaft sleeve is consistent with the outer diameter of the upper valve stem, the first shaft sleeve is arranged below the second shaft sleeve, and the bottom of the first shaft sleeve is flush with the bottom of the upper valve pipe body.

[0028] A first annular notch is arranged in the upper valve pipe body corresponding to the top of the second shaft sleeve, the first annular notch is in communication with the hollow segment of the upper valve pipe body, a first gasket and a second gasket are sequentially arranged in the upper valve pipe body corresponding to the first annular notch, the first gasket and the second gasket have consistent structures, the outer diameter of the first gasket and the second gasket is consistent with the inner diameter of the upper valve pipe body, the second gasket is arranged at the bottom of the first gasket, and the bottom of the second gasket abuts against the top of the second shaft sleeve.

[0029] A limiting ring is concentrically and fixedly arranged at the upper part of the upper valve stem, the outer peripheral surface of the limiting ring abuts against the inner wall surface of the upper valve pipe body, and the bottom of the limiting ring abuts against the top of the first gasket.

[0030] Through the technical scheme, the first shaft sleeve and the second shaft sleeve can fill the gap between the upper valve stem and the upper valve body, thereby effectively preventing leakage of the medium from the gap between the valve stem and the valve pipe, and ensuring the sealing performance of the three-eccentric expansion butterfly valve.

[0031] Further, the outer periphery of the lower part of the lower valve stem is sleeved with a third shaft sleeve, the third shaft sleeve is rotationally connected with the lower valve stem, the third shaft sleeve is fixedly connected with the lower valve pipe body, the bottom of the third shaft sleeve is flush with the bottom of the lower valve pipe body,

[0032] The lower valve pipe body is provided with a second annular notch corresponding to the bottom of the third shaft sleeve, the second annular notch is communicated with the hollow section of the lower valve pipe body, and the lower valve pipe body is provided with a lower gasket corresponding to the second annular notch, and the top of the lower gasket abuts against the bottom of the third shaft sleeve.

[0033] The bottom of the lower valve pipe body is provided with a lower pressing cover which is detachably arranged, the upper end of the lower pressing cover extends into the hollow section of the lower valve pipe body, and the upper end of the lower pressing cover abuts against the bottom of the lower gasket.

[0034] Through the technical scheme, the third shaft sleeve can fill the gap between the lower valve stem and the lower valve body, thereby effectively preventing leakage of the medium from the gap between the valve stem and the valve pipe, and ensuring the sealing performance of the three-eccentric expansion butterfly valve.

[0035] Further, the upper valve stem is sleeved with a first valve plate gasket corresponding to the bottom of the first shaft sleeve, the first valve plate gasket is rotationally connected with the upper valve stem, and the top of the first valve plate gasket abuts against the top of the first fixing member.

[0036] The lower valve stem is sleeved with a fourth shaft sleeve corresponding to the upper part of the third shaft sleeve, the fourth shaft sleeve is rotationally connected with the lower valve stem and fixedly connected with the lower valve pipe body, the top of the fourth shaft sleeve is flush with the top of the lower valve pipe body, the lower valve stem is sleeved with a second valve plate gasket corresponding to the top of the fourth shaft sleeve, the second valve plate gasket is rotationally connected with the lower valve stem, and the bottom of the second valve plate gasket abuts against the bottom of the second fixing member.

[0037] Through the technical scheme, the first valve plate gasket and the second valve plate gasket can improve the sealing performance between the upper valve stem, the first fixing member, the second shaft sleeve and the upper valve pipe body, and the sealing performance between the lower valve stem, the second fixing member, the fourth shaft sleeve and the lower valve pipe body, thereby effectively preventing leakage of the fluid medium from the connection, and improving the sealing effect of the three-eccentric expansion butterfly valve.

[0038] The above scheme has the following advantages:

[0039] 1. By setting the expansion mechanism, when the eccentric expansion butterfly valve needs to be in a closed state, the valve plate is first closed, then gas is filled into the annular sealing ring through the joint, the annular sealing ring is expanded until there is no gap between the valve plate and the valve body, and the valve is in a sealed state; when the eccentric expansion butterfly valve needs to be in an open state, the gas in the annular sealing ring is first discharged, then the valve plate is opened, thereby ensuring that the eccentric expansion butterfly valve is closed, the valve plate and the valve body are in a sealed state, and the service life of the annular sealing ring is improved, thereby improving the opening frequency and service life of the eccentric expansion butterfly valve;

[0040] 2. By setting the axial length of the annular sealing ring, when the joint is in the gas inlet state, the annular sealing ring can fill the gap between the valve plate and the valve body after expansion, thereby ensuring the sealing performance of the three eccentric expansion butterfly valve, and effectively isolating the fluid;

[0041] 3. By setting the rubber ring framework, the rubber ring framework can maintain the relative stability of the shape of the annular sealing ring during the inflation expansion or exhaust contraction process, thereby preventing the annular sealing ring from being locally over-expanded or collapsed when the inflation pressure is uneven or the exhaust speed is too fast, thereby ensuring that the annular sealing ring can work normally under various working conditions; in addition, the rubber ring framework can guide the gas into or out of the annular sealing ring, thereby accelerating the expansion or contraction speed of the annular sealing ring, thereby improving the use efficiency of the equipment;

[0042] 4. By setting a plurality of fixing members, the second notch on each fixing member can increase the contact area with the valve rod, thereby improving the connection stability of the valve rod and the valve plate, thereby ensuring the reliability of the three eccentric expansion butterfly valve during use;

[0043] By setting the upper valve rod and the lower valve rod, the upper valve rod and the lower valve rod can be connected with the first fixing member and the second fixing member on the valve plate respectively, thereby simplifying the installation and maintenance process, thereby reducing the installation and maintenance time and labor intensity; by setting the matching valve rod and the second notch, the design of the regular hexagon makes it easier to align the position and angle when assembling the upper valve rod and the first fixing member or the lower valve rod and the second fixing member, thereby reducing the assembly error and improving the assembly accuracy;

[0044] 5. By setting the first shaft sleeve and the second shaft sleeve, the first shaft sleeve and the second shaft sleeve can fill the gap between the upper valve rod and the upper valve body, thereby effectively preventing leakage of the medium from the gap between the valve rod and the valve pipe, thereby ensuring the sealing performance of the three eccentric expansion butterfly valve in the application;

[0045] 6、Through the third shaft sleeve is provided, the third shaft sleeve can fill the gap between the lower valve stem and the lower valve body, in turn can effectively prevent the medium from the gap between the valve stem and the valve pipe leakage, thereby guaranteeing the sealing performance of the three eccentric expansion butterfly valve in the application;

[0046] 7、Through the first valve plate pad and the second valve plate pad are provided, the first grommet can improve the sealing property between the upper valve stem, the first fixed part, the second shaft sleeve and the upper valve pipe body, the second grommet can improve the sealing property between the lower valve stem, the second fixed part, the fourth shaft sleeve and the lower valve pipe body, effectively prevent the fluid medium from the leakage from the connecting place, thereby improving the sealing effect of the three eccentric expansion butterfly valve. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to make the content of the utility model more easily be clearly understood, the following according to the specific embodiment of the utility model and combining with the drawings, the utility model is further detailed, wherein:

[0048] Figure 1 It is the structural schematic diagram of the utility model;

[0049] Figure 2 It is the left view of the utility model;

[0050] Figure 3 It is Figure 2 the sectional view of A-A view;

[0051] Figure 4 It is Figure 3 the local enlarged schematic view of serial number P;

[0052] Figure 5 It is the front view of the utility model;

[0053] Figure 6 It is Figure 5 the sectional view of B-B view;

[0054] Figure 7 It is Figure 6 the local enlarged schematic view of serial number Q;

[0055] Figure 8 It is Figure 6 the local enlarged schematic view of serial number M;

[0056] Figure 9 It is Figure 6 the local enlarged schematic view of serial number N;

[0057] Figure 10 It is the explosion schematic view of valve body and expansion mechanism in the utility model;

[0058] Figure 11 It is the structural schematic diagram of valve plate view one in the utility model;

[0059] Figure 12 Figure 2 is a structure diagram of the valve plate angle II in the utility model;

[0060] Figure 13 Figure 3 is a structure diagram of the valve rod in the utility model;

[0061] Figure 14 Figure 4 is a structure diagram of the valve body in the utility model;

[0062] Figure 15 Figure 5 is a structure diagram of the annular sealing ring in the utility model;

[0063] The figure mark explanation: 1, valve body; 101, valve body body; 102, upper valve pipe body; 103, lower valve pipe body; 2, valve rod; 201, upper valve rod; 202, lower valve rod; 3, driving mechanism; 4, valve plate; 5, annular sealing ring; 6, joint; 7, fixing piece; 701, first fixing piece; 702, second fixing piece; 8, second notch; 9, rubber ring skeleton; 10, third notch; 11, side gland; 12, sixth notch; 13, first shaft sleeve; 14, second shaft sleeve; 15, first grommet; 16, second grommet; 17, limiting ring; 18, third shaft sleeve; 19, fourth shaft sleeve; 20, lower gasket; 21, lower gland; 22, first valve plate pad; 23, second valve plate pad; 24, first through hole; 25, second through hole; 26, switch output; 27, packing gland. DETAILED DESCRIPTION

[0064] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0065] In a certain embodiment, as shown in Figures 1 to 15 A kind of eccentric expansion butterfly valve, including valve body 1, circular notch is provided on valve body 1, valve plate 4 is provided with concentrically on valve body 1 corresponding to circular notch, valve rod 2 and driving mechanism 3 are provided on valve body 1, driving mechanism 3 is used to drive valve rod 2 rotation, valve rod 2 and valve body 1 are rotationally connected, the side vertical surface of valve plate 4 is fixedly connected with valve rod 2, in this embodiment, motor is selected for driving mechanism 3;

[0066] A kind of eccentric expansion butterfly valve also includes switch output 26, switch output 26 is used to control driving mechanism 3, this technology is in public knowledge, here do not make too much repetition.

[0067] The center of the valve plate 4 is eccentric to the center of the valve rod 2 in vertical and horizontal directions;

[0068] The outer periphery of the valve plate 4 is provided with a first notch, so that the radial length value of the two side vertical surfaces of the valve plate 4 in the axial direction is gradually reduced. The eccentric expansion butterfly valve in the present application is a three-eccentric expansion butterfly valve due to the eccentricity of the center of the valve plate 4 to the center of the valve rod 2 in vertical and horizontal directions and the provision of the first notch.

[0069] The valve body 1 is provided with an expansion mechanism, which includes a communication annular sealing ring 5 and a plurality of joints 6. The outer ring of the annular sealing ring 5 is fixedly arranged on the valve body 1 corresponding to the circular notch. The other end of each joint 6 extends out of the valve body 1. Each joint 6 is used for aeration or air release, so that the annular sealing ring 5 is in an expanded state or a contracted state, realizing no gap or gap between the annular sealing ring 5 and the valve plate 4. In the present embodiment, the expansion mechanism includes two joints 6 with the same structure, and the two joints 6 are arranged at the two ends of the valve body 1 in the radial direction. When the eccentric expansion butterfly valve needs to be in a closed state, the valve plate 4 is closed first, and then the joint 6 is used to fill gas into the annular sealing ring 5, so that the annular sealing ring 5 expands until there is no gap between the valve plate 4 and the valve body 1, and the valve is in a sealed state. When the eccentric expansion butterfly valve needs to be in an open state, the gas in the annular sealing ring 5 is discharged first, and then the valve plate 4 is opened, so that the valve plate 4 and the valve body 1 are in a sealing effect when the eccentric expansion butterfly valve is closed, and the service life of the annular sealing ring 5 can be improved, thereby improving the opening frequency and service life of the eccentric expansion butterfly valve.

[0070] A plurality of fixing members 7 are arranged on the side vertical surface of the valve plate 4, and a second notch 8 is arranged on each fixing member 7. Each second notch 8 penetrates the thickness direction of the corresponding fixing member 7, and the shape of each second notch 8 is consistent with the shape of the valve rod 2, so that each fixing member 7 is fixedly sleeved on the valve rod 2.

[0071] The fixing member 7 includes a first fixing member 701 and a second fixing member 702 arranged on the side vertical surface of the valve plate 4 from top to bottom. The first fixing member 701 and the second fixing member 702 have the same structure, and the second notch 8 on the first fixing member 701 and the second fixing member 702 is arranged in a regular hexagonal shape.

[0072] The first fixing member 701 and the second fixing member 702 are provided with a sixth notch 12. Each sixth notch 12 is arranged along the axial direction of the valve plate 4, and each sixth notch 12 is arranged in communication with the corresponding second notch 8.

[0073] The second notch 8 on each fixing member 7 can increase the contact area with the valve stem 2, thereby improving the connection stability of the valve stem 2 and the valve plate 4, and ensuring the reliability of the three-eccentric expansion butterfly valve during use.

[0074] The inner ring shape of the annular sealing ring 5 is consistent with the outer peripheral shape of the valve plate 4, and the axial length value of the annular sealing ring 5 is greater than the axial length value of the valve plate 4; when the joint 6 is in the air inlet state, the annular sealing ring 5 can fill the gap between the valve plate 4 and the valve body 1 after expansion, thereby ensuring the sealing performance of the three-eccentric expansion butterfly valve, and effectively isolating the fluid.

[0075] The expansion mechanism further comprises a rubber ring skeleton 9; the annular sealing ring 5 is provided with a third notch 10 at each end in the radial direction, and each third notch 10 is arranged at an end of the annular sealing ring 5 away from the valve plate 4; one end of the rubber ring skeleton 9 in the radial direction is arranged in the third notch 10; the rubber ring skeleton 9 is provided with a first through hole 24 and a second through hole 25 at both ends in the radial direction, each first through hole 24 penetrates the rubber ring skeleton 9 in the radial direction, and each second through hole 25 penetrates the rubber ring skeleton 9 in the radial direction; the two first through holes 24 are in communication with the two second through holes 25, and the two second through holes 25 are in communication with the two joints 6;

[0076] The side stand 11 is arranged on the side surface in the axial direction of the valve body 1, and the fourth notch is arranged on the lower part of the side stand 11 close to one side of the valve body 1; the fifth notch is arranged on the lower part of the valve body 1 close to the side stand 11, and the fifth notch is in communication with the fourth notch; the rubber ring skeleton 9 and the annular sealing ring 5 are arranged in the communicated third notch 10 and the fourth notch, and the two ends of the rubber ring skeleton 9 and the annular sealing ring 5 in the axial direction are respectively abutted against the valve body 1 and the side stand 11; the rubber ring skeleton 9 can maintain the relatively stable shape of the annular sealing ring 5 during inflation and deflation, so as to avoid the local over-expansion or collapse of the annular sealing ring 5 when the inflation pressure is uneven or the deflation speed is too fast, thereby ensuring the normal work of the annular sealing ring 5 under various working conditions;

[0077] In addition, the rubber ring skeleton 9 can guide the gas into or out of the annular sealing ring 5, thereby accelerating the expansion or contraction speed of the annular sealing ring 5, and improving the use efficiency of the equipment.

[0078] The valve stem 2 comprises an upper valve stem 201 and a lower valve stem 202, and the lower part of the upper valve stem 201 and the upper part of the lower valve stem 202 are arranged in a regular hexagonal shape; the driving mechanism 3 is used for driving the upper valve stem 201 to rotate, and the other end of the upper valve stem 201 penetrates the valve body 1 and extends into the circular notch, and is fixedly connected with the first fixing member 701;

[0079] One end of the lower valve stem 202 is arranged in the circular notch and is fixedly connected with the second fixing part 702, and the other end of the lower valve stem 202 extends out of the valve body 1 through the valve body 1; the upper valve stem 201 and the lower valve stem 202 can be respectively connected with the first fixing part 701 and the second fixing part 702 on the valve plate 4, thereby simplifying the installation and maintenance process, and reducing the installation and maintenance time and labor intensity;

[0080] Through the arrangement of the matched valve stem 2 and the second notch 8, the design of the regular hexagon makes it easier to align the position and angle when the upper valve stem 201 and the first fixing part 701 or the lower valve stem 202 and the second fixing part 702 are assembled, thereby reducing the assembly error and improving the assembly accuracy.

[0081] The valve body 1 comprises a valve body 101, an upper valve pipe body 102 and a lower valve pipe body 103, the upper valve pipe body 102 and the lower valve pipe body 103 are communicated with the valve body 101, and the upper valve pipe body 102 and the lower valve pipe body 103 are arranged along the radial direction of the valve body 101;

[0082] The upper valve stem 201 is arranged in the hollow section of the upper valve pipe body 102, and there is a gap between the outer peripheral surface of the upper valve stem 201 and the inner wall surface of the upper valve pipe body 102, and the lower valve stem 202 is arranged in the hollow section of the lower valve pipe body 103, and there is a gap between the outer peripheral surface of the lower valve stem 202 and the inner wall surface of the lower valve pipe body 103.

[0083] The first shaft sleeve 13 and the second shaft sleeve 14 are arranged in the upper valve pipe body 102 and have the same structure, the first shaft sleeve 13 and the second shaft sleeve 14 are rotatably connected with the upper valve stem 201 and fixedly connected with the upper valve pipe body 102, the inner diameter of the first shaft sleeve 13 is consistent with the outer diameter of the upper valve stem 201, the first shaft sleeve 13 is arranged below the second shaft sleeve 14, and the bottom of the first shaft sleeve 13 is flush with the bottom of the upper valve pipe body 102;

[0084] The top of the second shaft sleeve 14 is provided with a first annular notch in the upper valve pipe body 102, the first annular notch is communicated with the hollow section of the upper valve pipe body 102, the first annular notch is sequentially provided with a first gasket 15 and a second gasket 16 in the upper valve pipe body 102, the first gasket 15 and the second gasket 16 have the same structure, the outer diameter of the first gasket 15 and the second gasket 16 is consistent with the inner diameter of the upper valve pipe body 102, the second gasket 16 is arranged at the bottom of the first gasket 15, and the bottom of the second gasket 16 is in abutment with the top of the second shaft sleeve 14;

[0085] The upper part of the upper valve stem 201 is concentrically fixedly provided with a limiting ring 17, the outer peripheral surface of the limiting ring 17 is in abutment with the inner wall surface of the upper valve pipe body 102, and the bottom of the limiting ring 17 is in abutment with the top of the first gasket 15.

[0086] The first shaft sleeve 13 and the second shaft sleeve 14 can fill the gap between the upper valve stem 201 and the upper valve body 1, thereby effectively preventing the medium from leaking from the gap between the valve stem 2 and the valve pipe, thereby ensuring the sealing performance of the three-eccentric expansion butterfly valve in the application.

[0087] The eccentric expansion butterfly valve further comprises a packing gland 27 for tightly pressing the packing, such as graphite, polytetrafluoroethylene, etc., in the gap between the upper valve stem 201 and the upper valve pipe body 102 by applying pressure, thereby preventing the medium from leaking from the gap between the upper valve stem 201 and the upper valve pipe body 102. In the specific embodiment, one end of the packing gland 27 is located outside the upper valve pipe body 102, and the other end of the packing gland 27 extends into the hollow section of the upper valve pipe body 102 and is located above the limiting ring 17.

[0088] The outer periphery of the lower part of the lower valve stem 202 is sleeved with a third shaft sleeve 18, the third shaft sleeve 18 is rotatably connected with the lower valve stem 202, the third shaft sleeve 18 is fixedly connected with the lower valve pipe body 103, the bottom of the third shaft sleeve 18 is flush with the bottom of the lower valve pipe body 103,

[0089] The third shaft sleeve 18 corresponds to a second annular notch provided on the lower valve pipe body 103, the second annular notch is in communication with the hollow section of the lower valve pipe body 103, and a lower gasket 20 is provided in the lower valve pipe body 103 corresponding to the second annular notch, the top of the lower gasket 20 abuts against the bottom of the third shaft sleeve 18;

[0090] The bottom of the lower valve pipe body 103 is provided with a lower gland 21, and the lower gland 21 is detachably arranged, the upper end of the lower gland 21 extends into the hollow section of the lower valve pipe body 103, and the upper end of the lower gland 21 abuts against the bottom of the lower gasket 20.

[0091] The third shaft sleeve 18 can fill the gap between the lower valve stem 202 and the lower valve body 1, thereby effectively preventing the medium from leaking from the gap between the valve stem 2 and the valve pipe, thereby ensuring the sealing performance of the three-eccentric expansion butterfly valve in the application.

[0092] The first shaft sleeve 13 corresponds to a first valve plate gasket 22 provided on the upper valve stem 201, the first valve plate gasket 22 is rotatably connected with the upper valve stem 201, and the top of the first valve plate gasket 22 abuts against the top of the first fixing member 701;

[0093] The third shaft sleeve 18 is provided with a fourth shaft sleeve 19 above the corresponding lower valve rod 202, the fourth shaft sleeve 19 is rotatably connected with the lower valve rod 202 and fixedly connected with the lower valve pipe body 103, the top of the fourth shaft sleeve 19 is flush with the top of the lower valve pipe body 103, the second valve plate pad 23 is sleeved on the lower valve rod 202 above the top of the fourth shaft sleeve 19, the second valve plate pad 23 is rotatably connected with the lower valve rod 202, and the bottom of the second valve plate pad 23 abuts against the second fixing part 702; the first gasket ring 15 can improve the sealing performance among the upper valve rod 201, the first fixing part 701, the second shaft sleeve 14 and the upper valve pipe body 102, the second gasket ring 16 can improve the sealing performance among the lower valve rod 202, the second fixing part 702, the fourth shaft sleeve 19 and the lower valve pipe body 103, effectively preventing the fluid medium from leaking from the connection, thereby improving the sealing effect of the three eccentric expansion butterfly valve.

[0094] Operation process: the initial state of the three eccentric expansion butterfly valve is a liquid passing state, when it is needed to isolate the liquid flow, the driving mechanism is started to drive the upper valve rod to rotate, the upper valve rod drives the valve plate to rotate, and the lower valve rod also rotates at the same time, with the rotation of the valve plate, the liquid flow of the three eccentric expansion butterfly valve is reduced, when the plane of the valve plate and the plane of the valve body are in parallel relationship, the driving mechanism is turned off to stop the rotation of the valve plate, at this time, the two joints fill the gas into the annular sealing ring through the external structure, so that the annular sealing ring expands, and stops when there is no gap between the valve plate and the valve body, at this time, the fluid is completely blocked on one side of the valve plate and cannot flow through;

[0095] When it is needed to pass the liquid, the two joints discharge the gas in the annular sealing ring through the external structure, so that the annular sealing ring shrinks, so that there is a gap between the valve plate and the valve body, the driving mechanism is started to drive the upper valve rod to rotate, the upper valve rod drives the valve plate to rotate, in the rotation process, the flow rate of the fluid gradually increases, when the plane of the valve plate and the plane of the valve body are in vertical relationship, the flow rate of the flow is at the maximum value.

[0096] In the description of the utility model, need understanding is, the orientation or position relation indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or position relation shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as limiting the utility model. In the description of the utility model, unless otherwise specified and limited, it needs to be explained that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be mechanical connection or electrical connection, it can be the communication of the internal two elements, it can be directly connected, or indirectly connected through an intermediate medium, and for ordinary skilled persons in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0097] Obviously, the above embodiments are only examples for clearly illustrating, and are not limited to the embodiments, and for ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description, and it is not necessary and impossible to enumerate all the embodiments here, and the obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. An eccentric expansion butterfly valve, comprising a valve body, a circular notch being arranged on the valve body, a valve plate being arranged on the valve body in a concentric manner corresponding to the circular notch, a valve rod and a driving mechanism being arranged on the valve body, the driving mechanism being used to drive the valve rod to rotate, the valve rod and the valve body being connected in a rotating manner, and a side surface of the valve rod and the valve plate being fixedly connected. characterized in that Further comprising an expansion mechanism, the expansion mechanism comprising a communicating annular sealing ring and a joint, an outer ring of the annular sealing ring being fixedly arranged on an inner wall surface of the valve body, an inner ring of the annular sealing ring being arranged on one side of the valve plate in an axial direction, and the joint being used to ventilate or deflate, so that the annular sealing ring is in an expanded state or a contracted state, and a gap between the annular sealing ring and the valve plate is realized.

2. An eccentrically expanding butterfly valve as claimed in claim 1, characterized in that An outer periphery of the valve plate is provided with a first notch, so that radial length values of two side surfaces of the valve plate in the axial direction are arranged in a gradually decreasing manner. The inner ring of the annular sealing ring is consistent in shape with the outer periphery of the valve plate, and an axial length value of the annular sealing ring is greater than an axial length value of the valve plate.

3. An eccentrically expanding butterfly valve as claimed in claim 1, characterized in that A plurality of fixing members are arranged on the side surface of the valve plate, each of the fixing members is provided with a second notch, each of the second notches penetrates through a thickness direction of the corresponding fixing member, a shape of each of the second notches is consistent with a shape of the valve rod, and each of the fixing members is fixedly sleeved on the valve rod.

4. An eccentrically expanding butterfly valve as claimed in claim 1, characterized in that The expansion mechanism further comprises a rubber ring skeleton, two ends of the annular sealing ring in a radial direction are respectively provided with third notches, each of the third notches is arranged at one end of the annular sealing ring away from the valve plate, one end of the rubber ring skeleton in the radial direction is arranged in the third notch, and two ends of the rubber ring skeleton in the radial direction are respectively provided with first through holes and second through holes, each of the first through holes penetrates through the rubber ring skeleton in the radial direction, each of the second through holes penetrates through the rubber ring skeleton in the radial direction, two first through holes are in communication with two second through holes, and two second through holes are in communication with two joints. A side gland is arranged on a side surface of the valve body in the axial direction, a fourth notch is arranged on one side of a lower part of the side gland close to the valve body, a fifth notch is arranged on one side of the lower part of the valve body close to the side gland, the fifth notch is in communication with the fourth notch, the rubber ring skeleton and the annular sealing ring are arranged in the third notch and the fourth notch in communication, and two ends of the rubber ring skeleton and the annular sealing ring in the axial direction are respectively abutted against the valve body and the side gland.

5. An eccentrically expanding butterfly valve as claimed in claim 3, wherein, The fixing member comprises a first fixing member and a second fixing member arranged on the side surface of the valve plate in sequence from top to bottom, the first fixing member and the second fixing member are consistent in structure, and the second notches on the first fixing member and the second fixing member are arranged in a regular hexagonal shape. The first fixing member and the second fixing member are respectively provided with sixth notches, each of the sixth notches is arranged along the axial direction of the valve plate, and each of the sixth notches is arranged in a communicating manner with the corresponding second notch.

6. An eccentrically expanding butterfly valve as claimed in claim 5, characterized in that The valve stem includes an upper valve stem and a lower valve stem. The lower part of the upper valve stem and the upper part of the lower valve stem are both hexagonal in shape. The driving mechanism is used to drive the upper valve stem to rotate. The other end of the upper valve stem passes through the valve body and extends into the circular notch, and is fixedly connected to the first fixing member. One end of the lower valve stem is disposed in the circular notch and is fixedly connected to the second fixing member, and the other end of the lower valve stem extends out of the valve body through the valve body.

7. An eccentrically expanding butterfly valve as claimed in claim 6, characterized in that The valve body includes a valve body body, an upper valve tube body, and a lower valve tube body. The upper valve tube body and the lower valve tube body are both connected to the valve body body body, and the upper valve tube body and the lower valve tube body are both arranged along the radial direction of the valve body body body. The upper valve stem is disposed within the hollow section of the upper valve tube body, and there is a gap between the outer peripheral surface of the upper valve stem and the inner wall surface of the upper valve tube body. The lower valve stem is disposed within the hollow section of the lower valve tube body, and there is a gap between the outer peripheral surface of the lower valve stem and the inner wall surface of the lower valve tube body.

8. An eccentrically expanding butterfly valve as claimed in claim 7, characterized in that The upper valve tube body is provided with a first bushing and a second bushing with the same structure. Both the first bushing and the second bushing are rotatably connected to the upper valve stem and fixedly connected to the upper valve tube body. The inner diameter of the first bushing is the same as the outer diameter of the upper valve stem. The first bushing is located below the second bushing, and the bottom of the first bushing is flush with the bottom of the upper valve tube body. The upper valve tube body corresponding to the top of the second bushing is provided with a first annular notch, which is connected to the hollow section of the upper valve tube body. The upper valve tube body corresponding to the first annular notch is provided with a first washer and a second washer in sequence. The first washer and the second washer have the same structure. The outer diameter of the first washer and the second washer are the same as the inner diameter of the upper valve tube body. The second washer is located at the bottom of the first washer, and the bottom of the second washer abuts against the top of the second bushing. A limiting ring is concentrically fixed on the upper part of the upper valve stem. The outer circumferential surface of the limiting ring abuts against the inner wall surface of the upper valve tube, and the bottom of the limiting ring abuts against the top of the first gasket ring.

9. An eccentrically expanding butterfly valve as claimed in claim 8, characterized in that A third bushing is fitted around the lower outer periphery of the lower valve stem. The third bushing is rotatably connected to the lower valve stem. The third bushing is fixedly connected to the lower valve tube body. The bottom of the third bushing is flush with the bottom of the lower valve tube body. A second annular notch is provided on the lower valve tube body corresponding to the bottom of the third bushing. The second annular notch is connected to the hollow section in the lower valve tube body. A lower gasket is provided in the lower valve tube body corresponding to the second annular notch. The top of the lower gasket abuts against the bottom of the third bushing. The bottom of the lower valve tube is provided with a lower pressure cover, which is detachable. The upper end of the lower pressure cover extends into the hollow section of the lower valve tube and abuts against the bottom of the lower gasket.

10. An eccentrically expanding butterfly valve as claimed in claim 9, characterized in that A first valve plate pad is fitted on the upper valve stem corresponding to the bottom of the first bushing. The first valve plate pad and the upper valve stem are rotatably connected, and the first valve plate pad abuts against the top of the first fixing member. The third shaft sleeve is provided with a fourth shaft sleeve on the top thereof, the fourth shaft sleeve is rotatably connected with the lower valve rod and fixedly connected with the lower valve pipe body, the top of the fourth shaft sleeve is flush with the top of the lower valve pipe body, and the fourth shaft sleeve is provided with a second valve plate pad on the top thereof, the second valve plate pad is rotatably connected with the lower valve rod, and the bottom of the second valve plate pad is in abutment with the second fixing member.

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