A triple offset butterfly valve

Abstract

The utility model provides a kind of three eccentric butterfly valve, comprising: valve body;Valve seat, it is equipped with first conical surface;Valve shaft, rotation is set on valve body, and valve shaft is connected with valve plate;Cladding groove, groove bottom is set as the second conical surface with first conical surface coaxial and different diameter, cladding groove is used to cladding alloy and forms sealing surface, sealing surface is coaxially arranged with first conical surface and diameter is same, and sealing surface is third conical surface;Sealing ring, it is equipped with the fourth conical surface for cooperating sealing with third conical surface;Compression ring, for sealing ring is fixed on valve plate by compression;The width of third conical surface is less than the width of first conical surface, and the width of fourth conical surface is less than the width of third conical surface.Through the width of third conical surface is less than the width of first conical surface, and the width of fourth conical surface is less than the width of third conical surface, only in effective sealing area cladding is carried out, and unnecessary cladding area is reduced.After reducing cladding area, welding heat is significantly reduced, thereby reducing workpiece deformation risk.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a triple eccentric butterfly valve. Background Technology

[0002] Currently, in existing triple eccentric butterfly valve designs, the entire sealing cone surface is welded. However, the sealing ring that mates with it has a cone width much smaller than the valve body's sealing cone surface. The portion of the valve body's sealing cone surface that extends beyond the sealing ring's cone surface does not contribute to sealing and is unnecessary as it doesn't necessarily require weld overlay material, resulting in waste. Furthermore, the weld overlay surface beyond the effective sealing area adds extra weld overlay, generating additional welding heat that can further deform the workpiece. This deformation may lead to cracks in the weld layer.

[0003] The sealing surface of a triple-eccentric butterfly valve has an extremely complex geometry; it is not a typical cylindrical surface but rather an oblique cone. Extending the line of the sealing surface yields a sealing cone, and the sealing surface is actually a section of this oblique cone cut off, its projection approximating an elliptical contour. When welding on this oblique cone, the angle changes with each degree of rotation, and the approximate elliptical contour makes planning the welding trajectory extremely difficult. Common path planning methods, such as robot-assisted rotating body motion, struggle to ensure consistent interlayer overlap due to the inconsistent tilt angles of the sealing surface in different directions. This results in varying thicknesses of the reinforced layer in different areas of the same layer, leading to poor forming stability. This not only affects the sealing performance of the sealing surface but may also cause stress concentration under pressure due to uneven thickness, thus reducing the valve's service life. Summary of the Invention

[0004] This utility model provides a triple eccentric butterfly valve to solve the problem that in existing triple eccentric butterfly valves, the weld overlay width of the valve body sealing cone surface is greater than the width of the sealing ring cone surface, resulting in no sealing effect in the excess part, waste of weld overlay material, and the extra weld overlay amount in the excess part will generate additional welding heat, increase the amount of workpiece welding deformation, and thus cause cracks in the weld layer.

[0005] This utility model provides a triple-eccentric butterfly valve, comprising:

[0006] Valve body;

[0007] A valve seat is disposed on the valve body, and a medium passage is provided on the valve seat. A first conical surface is provided on the circumferential sidewall of the valve seat surrounding the medium passage.

[0008] A valve shaft is rotatably mounted on the valve body, and a valve plate is connected to the valve shaft. The valve shaft is used to rotate the valve plate to open or close the medium passage.

[0009] A weld overlay groove is radially formed on the valve seat along the medium channel. The bottom of the weld overlay groove is set as a second conical surface that is coaxial with the first conical surface but has a different diameter. The weld overlay groove is used to weld alloy to form a sealing surface. The sealing surface is coaxial with the first conical surface and has the same diameter. The sealing surface is a third conical surface.

[0010] A sealing ring is provided on the valve plate, and the sealing ring has a fourth conical surface along its circumferential sidewall for sealing with the third conical surface;

[0011] A pressure ring is bolted to the valve plate, and the pressure ring is used to press and fix the sealing ring on the valve plate;

[0012] The width of the third conical surface is less than the width of the first conical surface, and the width of the fourth conical surface is less than the width of the third conical surface.

[0013] In one embodiment of the present invention, the valve plate is provided with a fifth conical surface that is coaxial with the first conical surface and has a smaller diameter than the first conical surface. When the valve plate rotates, the fifth conical surface is used to avoid interference between the valve plate and the first conical surface of the valve seat.

[0014] In one embodiment of the present invention, a sixth conical surface is provided on the outer side wall of the pressure ring along the circumferential direction, and the sixth conical surface is coaxial with the fifth conical surface and has the same diameter.

[0015] In one embodiment of the present invention, the valve plate is provided with a first step and a second step, the first step being used for positioning and installing the sealing ring, and the second step being used for positioning and installing the pressure ring.

[0016] In one embodiment of the present invention, the first step and the second step are coaxially arranged, and the diameter of the first step is larger than that of the second step.

[0017] In one embodiment of the present invention, the outer diameter of the pressure ring is larger than the inner diameter of the sealing ring, but smaller than the outer diameter of the sealing ring.

[0018] In one embodiment of the present invention, the overlapping area of ​​the pressure ring and the sealing ring is greater than 80% of the area of ​​the sealing ring.

[0019] In one embodiment of the present invention, a groove is provided on the first step, the groove is used to install a sealing gasket, and the sealing gasket is used to seal the gap between the valve plate and the sealing ring.

[0020] In one embodiment of the present invention, a rounded corner is provided between the bottom of the weld overlay groove and the groove wall.

[0021] The beneficial effects of this utility model are as follows: This utility model proposes a triple-eccentric butterfly valve. By designing the width of the third conical surface to be smaller than the width of the first conical surface, and the width of the fourth conical surface to be smaller than the width of the third conical surface, welding is performed only in the effective sealing area, reducing unnecessary welding area and solving the problem of material waste. Reducing the welding area significantly lowers the welding heat, thereby reducing the risk of workpiece deformation and indirectly preventing weld cracks. The third conical surface formed by welding is coaxial with the first conical surface and has the same diameter, ensuring precise fit with the fourth conical surface of the sealing ring and improving sealing performance. By welding the alloy within the weld groove, the weld thickness is consistent, effectively avoiding the problem of uneven weld thickness. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] In the attached diagram:

[0024] Figure 1 A cross-sectional structural schematic diagram of a triple eccentric butterfly valve provided in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of the structure of section A in the middle;

[0026] Figure 3 This is a cross-sectional schematic diagram of the integral valve seat structure of the triple eccentric butterfly valve provided in one embodiment of the present utility model.

[0027] Figure 4 A schematic diagram of the split valve seat structure of a triple eccentric butterfly valve provided in an embodiment of the present invention;

[0028] Figure 5 This is a schematic cross-sectional view of the valve plate of a triple eccentric butterfly valve provided in one embodiment of the present invention.

[0029] The attached figures are labeled as follows:

[0030] Valve body 1, valve seat 2, medium passage 201, first conical surface 202, valve shaft 3, valve plate 4, fifth conical surface 401, first step 402, groove 402a, second step 403, weld overlay groove 5, second conical surface 501, third conical surface 502, rounded corner 503, sealing ring 6, fourth conical surface 601, pressure ring 7, sixth conical surface 701, bolt 8, sealing washer 9. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0034] Please combine Figures 1 to 5 As shown, this utility model provides a triple eccentric butterfly valve.

[0035] In an exemplary embodiment of this application, the device includes: a valve body 1; a valve seat 2 disposed on the valve body 1, the valve seat 2 having a medium channel 201, and a first conical surface 202 on the circumferential sidewall surrounding the medium channel 201; a valve shaft 3 rotatably disposed on the valve body 1, a valve plate 4 connected to the valve shaft 3, the valve shaft 3 being used to rotate the valve plate 4 to open or close the medium channel 201; and a weld overlay groove 5 radially formed on the valve seat 2 along the medium channel 201, the bottom of the weld overlay groove 5 being a second conical surface 501 coaxial with the first conical surface 202 but with a different diameter. The weld groove 5 is used to build up the alloy to form a sealing surface. The sealing surface is coaxial with the first conical surface 202 and has the same diameter. The sealing surface is the third conical surface 502. The sealing ring 6 is set on the valve plate 4. The sealing ring 6 has a fourth conical surface 601 along its circumferential sidewall for sealing with the third conical surface 502. The pressure ring 7 is connected to the valve plate 4 by bolts 8. The pressure ring 7 is used to press and fix the sealing ring 6 on the valve plate 4. The width of the third conical surface 502 is smaller than the width of the first conical surface 202, and the width of the fourth conical surface 601 is smaller than the width of the third conical surface 502.

[0036] In this embodiment, the valve body 1 serves as an integral support, with the valve shaft 3 internally rotatably connected. The valve shaft 3 drives the valve plate 4 to rotate to control the opening and closing of the medium channel 201. The valve seat 2 includes an integral valve seat 2 and a split valve seat 2. The integral valve seat 2 is integrally formed with the valve body 1 and is fixed on the valve body 1. The first conical surface 202 of its circumferential sidewall provides a reference surface for sealing. A weld overlay groove 5 is radially formed on the valve seat 2 along the medium channel 201. The bottom of the groove is a second conical surface 501, which is coaxial with the first conical surface 202 but has a different diameter. By welding an alloy inside the weld overlay groove 5, a third conical surface 502 (i.e., the sealing surface) is formed, which is coaxial with the first conical surface 202 and has the same diameter. The width of the third conical surface 502 is less than the width of the first conical surface 202, ensuring that the weld overlay area only covers the effective sealing area. The sealing ring 6 is installed on the valve plate 4, and the fourth conical surface 601 on its circumferential sidewall mates with the third conical surface 502 to achieve a seal. The pressure ring 7 is fixed to the valve plate 4 by bolts 8, pressing the sealing ring 6 to ensure sealing reliability. The width of the fourth conical surface 601 is less than the width of the third conical surface 502, further defining the effective sealing area. In this embodiment, the width of the third conical surface 502 is 1-1.5 mm wider than the width of the fourth conical surface 601. Compared to the 2-10 mm width margin of existing full-surface weld sealing surfaces, this application effectively reduces the weld width. By reducing the weld area, the amount of precious metal alloy used is reduced, material costs are lowered, ineffective welding in non-sealing areas is avoided, and processing time and energy consumption are reduced. Reducing the amount of weld reduces the input of welding heat, significantly reduces the risk of workpiece deformation, improves the machining accuracy of the valve seat 2, and ensures that the coaxiality and diameter of the third conical surface 502 and the fourth conical surface 601 are matched, ensuring uniform contact of the sealing surface and improving sealing performance. Reduced deformation further reduces the possibility of weld layer cracks, improving the reliability and durability of the sealing surface. By welding the alloy in the weld groove 5, the weld thickness is consistent, effectively avoiding the problem of uneven weld thickness.

[0037] It is worth noting that in the triple eccentric butterfly valve shown in this embodiment, angle α is the angle between the axis of the inclined conical sealing surface of the valve seat 2 and the horizontal reference direction, and angle α represents the inclination angle between the axis of the cone containing the welded sealing surface and the horizontal reference direction; angle β is the cone angle of the cone containing the welded sealing surface, and angle β represents the opening amplitude of the cone containing the welded sealing surface. The larger the angle β is, the more significant the inclination of the welded sealing surface; e is the distance by which the axis of the valve shaft 3 deviates radially from the axis of the valve body 1, i.e., the radial eccentricity. When the valve plate rotates to open and close, the sealing ring 6 instantly disengages from or contacts the sealing surface of the valve seat 2, greatly reducing friction and wear during the opening and closing process. The surface of the sealing ring 6 used to seal with the welded sealing surface is provided with cones of the same inclination angle α and the same opening amplitude β.

[0038] In an exemplary embodiment of this application, the valve plate 4 is provided with a fifth conical surface 401 that is coaxially arranged with the first conical surface 202 and has a smaller diameter than the first conical surface 202. When the valve plate 4 rotates, the fifth conical surface 401 is used to avoid interference between the valve plate 4 and the first conical surface 202 of the valve seat 2.

[0039] In this embodiment, during the opening and closing process of the triple eccentric butterfly valve, the valve shaft 3 experiences a radial eccentricity e between its axis and the valve body 1 axis, an inclination angle α between the axis of the cone containing the welded sealing surface and the horizontal reference, and a cone angle β. This causes the valve plate's movement trajectory to be a complex eccentric path of rotation, offset, and inclination, rather than a simple concentric circular motion. Consequently, the relative position between the edge of the valve plate 4 and the valve seat 2 continuously changes. By providing a fifth conical surface 401 on the valve plate 4, which is coaxial with the first conical surface 202 of the valve seat 2 but has a smaller diameter, a radial gap is formed between the fifth conical surface 401 and the first conical surface 202, ensuring that the edge of the valve plate 4 does not contact the valve seat 2 when rotating. When the valve plate 4 is fully closed, the fourth conical surface 601 of the sealing ring 6 contacts the third conical surface 502 of the valve seat 2 to achieve a seal, while the fifth conical surface 401 does not participate in the sealing. The avoidance design of the fifth conical surface 401 eliminates the mechanical collision between the valve plate 4 and the valve seat 2 during rotation, ensuring smooth valve operation, reducing wear and jamming caused by interference, and extending the service life of the valve.

[0040] In an exemplary embodiment of this application, the pressure ring 7 has a sixth conical surface 701 on its outer side wall along the circumferential direction. The sixth conical surface 701 is coaxial with the fifth conical surface 401 and has the same diameter.

[0041] In this embodiment, the pressure ring 7 is fixed to the valve plate 4 by bolts 8 to compress the sealing ring 6. The sixth conical surface 701 of its outer wall is coaxial with the fifth conical surface 401 of the valve plate 4 and has the same diameter, forming a continuous conical surface structure. This ensures that the sixth conical surface 701 and the fifth conical surface 401 are seamlessly connected in space, forming a uniform clearance profile. Since the sixth conical surface 701 and the fifth conical surface 401 have the same diameter, the combination of the valve plate 4 and the pressure ring 7 forms a smooth clearance surface when rotating, avoiding interference between the edge of the pressure ring 7 and the valve seat 2.

[0042] In an exemplary embodiment of this application, the valve plate 4 is provided with a first step 402 and a second step 403. The first step 402 is used to position and install the sealing ring 6, and the second step 403 is used to position and install the pressure ring 7.

[0043] In this embodiment, a first step 402 and a second step 403 are sequentially arranged on the valve plate 4 along the medium flow direction. The diameter and depth of the first step 402 match the shape of the sealing ring 6. The first step 402 provides radial and axial positioning for the sealing ring 6, allowing operators to quickly position and install the sealing ring 6 on the valve plate 4. The dimensions of the second step 403 match the shape of the pressure ring 7. The second step 403 is used for radial and axial positioning of the pressure ring 7, ensuring accurate relative positioning between the pressure ring 7 and the sealing ring 6 during installation. The sealing ring 6 is initially positioned by the first step 402, and then positioned by the pressure ring 7 by the second step 403. Finally, it is connected to the valve plate 4 by bolts 8, thus pressing and fixing the sealing ring 6. Through the structural design of the first step 402 and the second step 403 on the valve plate 4, the displacement or misalignment of the sealing ring 6 during assembly or operation is effectively avoided.

[0044] In an exemplary embodiment of this application, the first step 402 and the second step 403 are coaxially arranged, and the diameter of the first step 402 is larger than that of the second step 403.

[0045] In this embodiment, the first step 402 and the second step 403 are coaxially arranged and the diameter of the first step 402 is greater than the diameter of the second step 403, so that the first step 402 and the second step 403 form a stepped structure on the valve plate 4. The larger diameter of the first step 402 provides sufficient support surface for the sealing ring 6 to ensure that its circumferential force is uniform; the smaller diameter of the second step 403 allows the pressure ring 7 to cover and press the sealing ring 6.

[0046] In an exemplary embodiment of this application, the outer diameter of the pressure ring 7 is larger than the inner diameter of the sealing ring 6, but smaller than the outer diameter of the sealing ring 6.

[0047] In this embodiment, the outer diameter of the pressure ring 7 is larger than the inner diameter of the sealing ring 6 and smaller than the outer diameter of the sealing ring 6, thereby ensuring that the pressure ring 7 and the sealing ring 6 have an overlapping area in the radial direction, and ensuring that the pressure ring 7 can effectively press and fix the sealing ring 6 on the valve plate 4.

[0048] In an exemplary embodiment of this application, the overlapping area of ​​the pressure ring 7 and the sealing ring 6 is greater than 80% of the area of ​​the sealing ring 6.

[0049] In this embodiment, the overlap area between the pressure ring 7 and the sealing ring 6 is greater than 80% of the area of ​​the sealing ring 6, so that the overlap area between the pressure ring 7 and the sealing ring 6 is large enough to ensure that the pressure ring 7 can apply sufficient preload to the sealing ring 6.

[0050] In an exemplary embodiment of this application, a groove 402a is provided on the first step 402. The groove 402a is used to install a sealing gasket 9, and the sealing gasket 9 is used to seal the gap between the valve plate 4 and the sealing ring 6.

[0051] In this embodiment, the width and depth of the groove 402a match the cross-sectional dimensions of the sealing gasket 9, ensuring that the sealing gasket 9, after being embedded, is flush with or slightly higher than the surface of the first step 402. The sealing gasket 9 forms a second line of defense at the contact surface between the valve plate 4 and the sealing ring 6, preventing the medium from penetrating through the tiny gap between them, thus ensuring the sealing performance of the valve.

[0052] In an exemplary embodiment of this application, a rounded corner 503 is provided between the bottom of the weld overlay groove 5 and the groove wall.

[0053] In this embodiment, the junction between the bottom and wall of the weld overlay groove 5 is the area where thermal stress is most concentrated during the welding process. The rounded corner 503 changes the stress distribution path through a smooth transition, allowing the thermal stress to diffuse evenly along the rounded corner. By setting the rounded corner 503 in the weld overlay groove 5, the generation of weld overlay cracks is significantly reduced, and the integrity and wear resistance of the weld overlay alloy sealing surface are improved.

[0054] The working principle involves designing the width of the third conical surface 502 to be smaller than the width of the first conical surface 202, and the width of the fourth conical surface 601 to be smaller than the width of the third conical surface 502. Welding is performed only in the effective sealing area, reducing unnecessary welding area and solving the problem of material waste. Reducing the welding area significantly lowers the welding heat, thereby reducing the risk of workpiece deformation and indirectly preventing weld cracks. The third conical surface 502 formed by welding is coaxial with the first conical surface 202 and has the same diameter, ensuring precise fit with the fourth conical surface 601 of the sealing ring 6 and improving sealing performance. By welding the alloy within the weld groove 5, the weld thickness is consistent, effectively avoiding the problem of uneven weld thickness.

[0055] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A triple-eccentric butterfly valve, comprising: Valve body; A valve seat is disposed on the valve body, and a medium passage is provided on the valve seat. A first conical surface is provided on the circumferential sidewall of the valve seat surrounding the medium passage. A valve shaft is rotatably mounted on the valve body, and a valve plate is connected to the valve shaft. The valve shaft is used to rotate the valve plate to open or close the medium passage. A weld overlay groove is radially formed on the valve seat along the medium channel. The bottom of the weld overlay groove is set as a second conical surface that is coaxial with the first conical surface but has a different diameter. The weld overlay groove is used to weld alloy to form a sealing surface. The sealing surface is coaxial with the first conical surface and has the same diameter. The sealing surface is a third conical surface. A sealing ring is provided on the valve plate, and the sealing ring has a fourth conical surface along its circumferential sidewall for sealing with the third conical surface; A pressure ring is bolted to the valve plate, and the pressure ring is used to press and fix the sealing ring on the valve plate; The width of the third conical surface is less than the width of the first conical surface, and the width of the fourth conical surface is less than the width of the third conical surface.

2. The triple eccentric butterfly valve according to claim 1, characterized in that: The valve plate is provided with a fifth conical surface that is coaxial with the first conical surface and has a smaller diameter than the first conical surface. When the valve plate rotates, the fifth conical surface is used to avoid interference between the valve plate and the first conical surface of the valve seat.

3. The triple eccentric butterfly valve according to claim 2, characterized in that: The pressure ring has a sixth conical surface on its outer circumferential side wall. The sixth conical surface is coaxial with the fifth conical surface and has the same diameter.

4. The triple eccentric butterfly valve according to claim 1, characterized in that: The valve plate is provided with a first step and a second step. The first step is used to position and install the sealing ring, and the second step is used to position and install the pressure ring.

5. The triple eccentric butterfly valve according to claim 4, characterized in that: The first step and the second step are coaxially arranged, and the diameter of the first step is larger than that of the second step.

6. The triple eccentric butterfly valve according to claim 4, characterized in that: The outer diameter of the pressure ring is larger than the inner diameter of the sealing ring, but smaller than the outer diameter of the sealing ring.

7. The triple eccentric butterfly valve according to claim 6, characterized in that: The overlap area between the pressure ring and the sealing ring is greater than 80% of the area of ​​the sealing ring.

8. The triple eccentric butterfly valve according to claim 4, characterized in that: The first step is provided with a groove for installing a sealing gasket, which is used to seal the gap between the valve plate and the sealing ring.

9. The triple eccentric butterfly valve according to claim 1, characterized in that: The bottom and wall of the weld overlay groove are provided with rounded corners.

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