Large-diameter strong sealing type butterfly valve

Abstract

The invention relates to a large-diameter strong-sealing type butterfly valve. The large-diameter strong-sealing type butterfly valve comprises an executing mechanism, a valve body and a butterfly plate body. The valve body comprises a shell, a valve seat, a valve rod and a bearing device. The shell is provided with a cavity with openings in the two ends, and the openings in the two ends are relatively suitable for fluid to flow in and flow out. The valve seat is arranged at the opening end of the shell, and the butterfly plate body is rotationally arranged on the inner side of the valve seat. The driving end of the executing mechanism is connected with one end of the valve rod, the other end of the valve rod penetrates through the shell and is connected with the butterfly plate body, and when the executing mechanism drives the valve rod to rotate, the butterfly plate body is driven to rotate so as to open or close the opening of the shell; a first sealing ring is arranged between the butterfly plate body and the valve seat, the first sealing ring is annularly arranged on the side edge of the butterfly plate body and protrudes out of the edge of the butterfly plate body to be suitable for making contact with the inner side wall of the valve seat, and the pressing plate is pressed on the side, away from the butterfly plate body, of the first sealing ring. The first sealing ring is a metal sealing ring; the bearing device is connected with the butterfly plate body and is suitable for lifting the butterfly plate body so that the first sealing ring can tightly press the valve seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valves, and particularly relates to a large-diameter strong sealing butterfly valve. BACKGROUND

[0002] The butterfly valve rotates 90 degrees in the valve body by the torque transmitted by the actuator to realize opening and closing, has the characteristics of simple structure and small volume, and is one of the most competitive products in large-diameter valves. In the field of new-generation manned launch vehicles, the butterfly valve needs to serve in a super-low temperature environment of -183 DEG C and perform functions such as liquid oxygen propellant delivery and tank isolation sealing. However, the existing butterfly valve structure often adopts a soft sealing structure to seal between the valve body and the butterfly plate. If the butterfly valve is applied in a super-low temperature environment, the soft sealing ring between the valve body and the butterfly plate will harden, become brittle, accelerate aging, permanently deform or even decompose, thereby reducing the sealing performance of the butterfly valve.

[0003] The present application provides a large-diameter strong sealing butterfly valve to ensure the sealing performance of the butterfly valve in a super-low temperature application environment. SUMMARY

[0004] Therefore, the present application provides a large-diameter strong sealing butterfly valve. According to an aspect of the present application, a large-diameter strong sealing butterfly valve is provided, which comprises an actuator, a valve body and a butterfly plate body. The valve body comprises a shell, a valve seat, a valve rod and a load bearing device. The shell is provided with a cavity with two open ends, and the two open ends are suitable for flowing into and flowing out of fluid. The valve seat is arranged at one open end of the shell, and the butterfly plate body is rotatably arranged on the inner side of the valve seat. The driving end of the actuator is connected with one end of the valve rod, and the other end of the valve rod penetrates through the shell and is connected with the butterfly plate body, so that when the actuator drives the valve rod to rotate, the butterfly plate body is driven to rotate to open or close the opening of the shell. A first sealing ring is arranged between the butterfly plate body and the valve seat, the first sealing ring is annularly arranged on the side of the butterfly plate body and protrudes from the edge of the butterfly plate body and is suitable for contacting the inner side wall of the valve seat, and a pressing plate is pressed on the side of the first sealing ring away from the butterfly plate body. The first sealing ring is a metal sealing ring. The load bearing device is connected with the butterfly plate body and is suitable for lifting the butterfly plate body to tightly press the first sealing ring against the valve seat.

[0005] In a possible implementation, the inner side wall of the valve seat is a conical surface, and an eccentric angle is arranged between the axis of the conical surface and the axis of the shell.

[0006] In a possible implementation, the main body of the pressing plate is in the form of a ring-shaped plate structure, a plurality of bolt holes are formed in the circumferential direction of the pressing plate, and the pressing plate is connected with the butterfly plate body through the plurality of bolts.

[0007] In a possible implementation, a first shaft sleeve is arranged between the valve rod and the shell.

[0008] In a possible implementation, a second sealing ring is arranged between the butterfly plate body and the first sealing ring.

[0009] In a possible implementation, the load bearing device comprises a load bearing adjusting rod and an adjusting bolt. One end of the adjusting bolt is in abutment with one end of the load bearing adjusting rod, and the load bearing adjusting rod is connected to the butterfly plate body through the shell.

[0010] In a possible implementation, one side of the butterfly plate body is provided with a first connecting part and a second connecting part in protrusion. The valve rod is connected to the first connecting part, and the load bearing adjusting rod penetrates into the second connecting part and its side wall is in abutment with the bottom surface of the second connecting part.

[0011] In a possible implementation, the load bearing device further comprises a bottom cover. A through hole is arranged on one side of the shell connected to the load bearing device, and the bottom cover covers the through hole. The adjusting bolt penetrates through the bottom cover and is connected to the load bearing adjusting rod.

[0012] In a possible implementation, the actuator comprises a piston cylinder, a transmission piston device and a transmission rod. The transmission piston device is movably arranged inside the cavity of the piston cylinder and is connected to the transmission rod. One end of the transmission rod is connected to the valve rod. The transmission piston device is adapted to drive the valve rod to rotate through the transmission rod.

[0013] In a possible implementation, one end of the transmission rod away from the valve rod is provided with a trigger cam. Two micro switches are arranged on the inner wall of the piston cylinder in opposition, and the trigger ends of the micro switches are directed towards the trigger cam.

[0014] Beneficial effects: The actuator is suitable for providing driving force for the opening and closing of the butterfly plate body on the valve body. The two open ends of the shell of the valve body are suitable for being connected to the pipeline, and the two open ends are in communication with the pipeline. Fluid enters the shell from one of the openings and flows out from the other opening to achieve fluid circulation. The actuator drives the butterfly plate body to rotate 90 degrees inside the valve seat through the valve stem, so that the butterfly plate body closes or opens the opening. When the butterfly plate body completely covers the opening, the first sealing ring on the outer circle of the butterfly plate body effectively contacts the inner side wall of the valve seat. The first sealing ring is suitable for effectively sealing the gap between the butterfly plate body and the valve seat. The pressure plate on the first sealing ring is suitable for firmly mounting the first sealing ring on the butterfly plate body to prevent displacement and ensure the sealing performance of the first sealing ring. The first sealing ring is a hard metal sealing ring, so it can avoid the phenomenon of shrinkage, deformation and rupture due to the temperature of the working environment, avoid the influence of thermal expansion and contraction on the sealing performance, and have strong sealing ability in extremely low temperature environment to ensure the stability of the work. The setting of the pressure plate is suitable for improving the firmness of the first sealing ring on the butterfly plate body. At the same time, the load bearing device is arranged on the bottom side wall of the shell, which can lift and limit the butterfly plate body through the load bearing device, so that the butterfly plate body remains in the center position of the valve seat, ensuring that every part of the outer edge of the first sealing ring effectively contacts the inner wall of the valve body without malignant wear, so as to ensure the sealing ability of the butterfly plate body in the closed state and improve the service life of the butterfly valve. At the same time, under the action of the valve stem and the load bearing device fixing the butterfly plate body on both sides, the position of the butterfly plate body can be effectively limited to avoid the phenomenon of pitching and yawing of the butterfly plate body under the condition of large impact force of fluid.

[0015] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and serve to explain the principles of the present application.

[0017] Figure 1 A front view of a large-diameter strong sealing butterfly valve according to an embodiment of the present application is shown. Figure 2 A side cross-sectional view of a large-diameter strong sealing butterfly valve according to an embodiment of the present application is shown. Figure 3 A cross-sectional view of A-A in Figure 1 Figure 4 A main structure diagram of a shell according to an embodiment of the present application is shown. Figure 5 A front view of an actuator according to an embodiment of the present application is shown. ​Figure 6 a cross-sectional view of C-C in Figure 5 Figure 7 a cross-sectional view of D-D in Figure 5 Figure 8 a cross-sectional view of E-E in Figure 5 Figure 9 a cross-sectional view of B-B in Figure 5 Figure 10 a cross-sectional view of F-F in Figure 9 Figure 11 a schematic diagram of the eccentric angle R of the present application is shown.

[0018] actuator 100, housing 200, valve seat 300, butterfly plate body 400, valve rod 500, adjusting rod 600, first sealing ring 420, bolt hole 210, first through hole 230, second through hole 240, third sealing ring 280, second sealing ring 440, first shaft sleeve 510, first connecting part 450, second connecting part 460, second shaft sleeve 610, bottom cover 620, adjusting bolt 630, nut 631, fourth sealing ring 621, stop block 250, piston cylinder 110, piston block 700, rack 710, transmission rod 900, electrical connector 940, bearing 730, elastic energy storage sealing ring 740, cover plate 720, open cavity connector nozzle 150, open cavity channel 151, close cavity connector nozzle 140, close cavity channel 141, trigger cam 800, micro switch 830, inner cover 160, outer cover 120, packing layer 930, packing gland 920, fifth sealing ring 220, end cover 130. DETAILED DESCRIPTION

[0019] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the drawings indicate functionally similar or identical elements. Although various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0020] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. ​​​​​

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0023] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0024] Figure 1 A front view of a large-diameter, high-sealing butterfly valve according to an embodiment of this application is shown. Figure 2 A side sectional view of a large-diameter, high-sealing butterfly valve according to an embodiment of this application is shown. Figure 3 Show Figure 1 Cross-sectional view of AA in the diagram; as shown Figure 1 As shown, this large-diameter, high-sealing butterfly valve includes: an actuator 100, a valve body, and a butterfly plate 400; the valve body includes: a housing 200, a valve seat 300, a valve stem 500, and a load-bearing device; the housing 200 has a cavity with openings at both ends, and the openings at both ends are suitable for fluid to flow in and out; the valve seat 300 is disposed at one opening end of the housing 200, and the butterfly plate 400 is rotatably disposed inside the valve seat 300; the driving end of the actuator 100 is connected to one end of the valve stem 500, and the other end of the valve stem 500 passes through the housing 200 and is connected to the butterfly plate 400, so that when the actuator 100... When the valve stem 500 rotates, it drives the butterfly plate body 400 to rotate, thereby opening or closing the opening of the housing 200. A first sealing ring 420 is provided between the butterfly plate body 400 and the valve seat 300. The first sealing ring 420 is arranged around the side of the butterfly plate body 400 and protrudes from the edge of the butterfly plate body 400 to contact the inner wall of the valve seat 300. The pressure plate 410 presses the first sealing ring 420 on the side away from the butterfly plate body 400. The load-bearing device is set at the bottom of the housing 200 and connected to the butterfly plate body 400 to support the butterfly plate body 400 so that the first sealing ring 420 tightly presses the valve seat 300.

[0025] It should be noted that the actuator 100 is adapted to provide driving force for opening and closing of the butterfly plate body 400, the housing 200 of the valve body is adapted to be connected to the pipeline at both open ends, and both ends are in communication with the pipeline, so that the fluid enters the housing 200 from one of the openings and flows out from the other opening to achieve the flow of the fluid; the valve seat 300 provides a mounting space for the butterfly plate body 400, and facilitates the removal of the first sealing ring 420 and the valve seat 300 for separate maintenance and replacement; the actuator 100 drives the butterfly plate body 400 to rotate 90 degrees inside the valve seat 300 through the valve stem 500, so that the butterfly plate body 400 can realize the closing or opening of the opening, and when the butterfly plate body 400 completely covers the opening, the first sealing ring 420 on the outer ring of the butterfly plate body 400 is in effective contact with the inner wall of the valve seat 300, and the first sealing ring 420 is adapted to effectively seal the gap between the butterfly plate body 400 and the valve seat 300, and the first sealing ring 420 is a hard metal sealing ring, so that the first sealing ring can avoid shrinking, deformation and rupture due to the temperature of the working environment, avoid the influence of thermal expansion and contraction on the sealing performance, and improve the working stability and sealing capacity of the application in an extremely low temperature environment; the pressing plate 410 on the first sealing ring 420 is adapted to firmly mount the first sealing ring 420 on the butterfly plate body 400 to avoid displacement and ensure the sealing performance of the first sealing ring 420; meanwhile, the application is provided with a bearing device, which can lift the butterfly plate body 400 after the application is assembled, and when the butterfly plate body 400 is in a vertical installation state, the height position of the butterfly plate body 400 can be adjusted through the bearing device, so that the butterfly plate body 400 remains in the center position of the valve seat 300 (both coaxial), the first sealing ring 420 is in effective contact with the inner wall of the valve seat 300 at each position in the sealing state, and the stress on the inner wall of the valve seat 300 is uniform, so that the butterfly plate body 400 does not produce the phenomenon that the bottom inner wall of the valve seat 300 bears a large stress due to the gravity of the butterfly plate body 400, and the first sealing ring 420 effectively contacts the valve seat 300 without serious wear, so as to ensure the sealing capacity of the butterfly plate body 400 in the closed state, eliminate the influence of the weight of the butterfly plate body 400 on the sealing, and improve the service life of the butterfly valve.

[0026] Meanwhile, under the action of the valve stem 500 and the bearing device fixing the butterfly plate body 400 at both ends, the position of the butterfly plate body 400 can be effectively limited whether it is in a horizontal installation state or a vertical installation state, so as to ensure that it is always coaxial with the valve seat 300, effectively eliminate the influence of the weight of the butterfly plate body 400 on the operation of the butterfly valve from multiple aspects, and avoid the phenomenon that the butterfly plate body 400 tilts and deviates under the condition that the impact force of the fluid is large.

[0027] In a possible implementation, as Figure 4As shown, the main body of the shell 200 is a circular annular tubular structure, the inner side of which is suitable for circulating fluid, both ends of which are provided with flange connection plates 211, and the flange connection plates 211 are provided with two or more bolt holes 210, which are arranged along the circumferential direction of the flange connection plates 211 of the shell 200, and are suitable for being connected with the front and rear pipelines or equipment through bolts, so as to install the valve body at the installation position. Further, a first through hole 230 suitable for penetrating the valve rod 500 is formed in the top side wall of the shell 200, and a flange connection plate 270 is provided at the top of the shell 200, which is suitable for connecting the driving mechanism through the bolts 290, so that the transmission rod 900 of the driving mechanism can be connected with the valve rod 500. A second through hole 240 suitable for penetrating the load adjusting rod 600 is formed in the bottom side wall of the shell 200, so as to connect the load device with the butterfly plate body 400.

[0028] Further, the material of the shell 200 is a lightweight aluminum alloy with good oxygen compatibility.

[0029] Further, as shown in Figure 3 The main body of the valve seat 300 is a ring structure, the outer side wall of the valve seat 300 is a circular annular surface, and is matched with the inner side wall of the shell 200, the valve seat 300 can be embedded in the inner side of the shell 200 and matched with the inner side wall of the shell 200; the outer side wall of the valve seat 300 is provided with a connecting flange plate, the connecting flange plate of the valve seat 300 is matched on the end face of the shell 200 and connected with the shell 200 through a plurality of bolts 310, so as to embed and install the valve seat 300 in the opening of the shell 200.

[0030] Further, as shown in Figure 11 The inner side wall of the valve seat 300 is a conical surface, and the axis of the conical surface and the axis of the shell are provided with an eccentric angle R. It should be noted that the generatrix of the inner side wall of the valve seat 300 and the bottom surface of the valve seat 300 are provided with a preset angle c, and the preset angle c gradually increases and then gradually decreases along the circumferential direction of the valve seat 300, so as to form a complete but irregular conical surface; so that the axis of the conical surface (the connecting line between the conical vertex and the center of the conical bottom surface) and the axis of the shell 200 (the central axis of the opening of the shell 200) form an eccentric angle R; the value range of the eccentric angle R is 5°-15°: in order to overcome the defect of large leakage of hard sealing, the valve body is designed to be eccentric three times to ensure the sealing performance.

[0031] Further, the material of the valve seat 300 is a high-temperature alloy.

[0032] In one possible implementation, as shown in Figure 3As shown, the third sealing ring 280 is arranged between the connecting flange plate of the valve seat 300 and the shell 200, and is arranged in the annular groove on the side of the shell 200 facing the connecting flange plate. Preferably, the third sealing ring 280 is a graphite sealing ring.

[0033] In a possible implementation, the main body of the butterfly plate body 400 is a circular plate structure, and the outer side wall of the butterfly plate body 400 is a regular conical surface. The large-diameter side of the butterfly plate body 400 faces the outside of the opening and is provided with the first sealing ring 420, and the small-diameter side of the butterfly plate body 400 faces the inside of the opening and is provided with the first connecting part 450 and the second connecting part 460. A plurality of bolt holes are arranged at the edge of the side of the butterfly plate body 400 connected to the pressing plate 410, and the bolt holes are arranged in sequence along the circumference of the butterfly plate body 400, and are suitable for being connected to the pressing plate 410 through the bolts 430.

[0034] Further, the material of the butterfly plate body 400 is aluminum alloy.

[0035] In a possible implementation, the main body of the pressing plate 410 is an annular plate structure, and a plurality of bolt holes are also arranged along the circumference of the pressing plate 410. The bolt holes on the pressing plate 410 correspond to the bolt holes on the butterfly plate body 400, and the pressing plate 410 is connected to the butterfly plate body 400 through the plurality of bolts 430, so as to effectively fix the first sealing ring 420 between the pressing plate 410 and the butterfly plate body 400.

[0036] Further, the material of the pressing plate 410 is stainless steel.

[0037] Further, as shown in the drawings, Figure 3 The main body of the first sealing ring 420 is an annular structure, the side edge of the butterfly plate body 400 is provided with an annular groove, the first sealing ring 420 is arranged in the annular groove of the butterfly plate body 400, and the outer edge of the first sealing ring 420 is arranged protruding relative to the outer edge of the butterfly plate body 400 so as to contact the valve seat 300. The pressing plate 410 is tightly arranged on one side of the first sealing ring 420, so as to firmly hold the first sealing ring 420 in the annular groove of the butterfly plate body 400. The outer side wall of the first sealing ring 420 matches the inner side wall of the valve seat 300, and the outer side wall of the first sealing ring 420 is also an irregular conical surface and can completely overlap the inner side wall of the valve seat 300, so as to effectively seal the gap between the valve seat 300 and the butterfly plate body 400.

[0038] Preferably, the first sealing ring 420 is a high-temperature alloy sealing ring, such as an aluminum alloy sealing ring.

[0039] In a possible implementation, the second sealing ring 440 is arranged between the butterfly plate body 400 and the first sealing ring 420, and is arranged in the annular groove on the side of the butterfly plate body 400 facing the first sealing ring 420. Preferably, the second sealing ring 440 is a graphite sealing ring.

[0040] In a possible implementation, as shown in Figure 2 A first shaft sleeve 510 is arranged between the valve stem 500 and the housing 200. Further, the main body of the valve stem 500 is in a cylindrical structure; a rectangular structure key groove is arranged on the side wall of the valve stem 500 close to the bottom end, which is suitable for being connected with the first connecting part 450 of the butterfly plate body 400 through a key connection, and a rectangular structure connecting block 530 is arranged on the top end of the valve stem 500, which is suitable for being embedded in the transmission rod 900 of the actuator 100, so as to drive the butterfly plate body 400 to rotate when the valve stem 500 rotates.

[0041] Preferably, the material of the first shaft sleeve 510 is aluminum bronze.

[0042] In a possible implementation, a first limiting ring 520 is arranged between the housing 200 and the valve stem 500, the first limiting ring 520 is sleeved on the valve stem 500 and embedded on the outer side wall of the valve stem 500, and a convex surface is arranged in the first through hole 230 of the housing 200, and the first limiting ring 520 is placed on the convex surface; so as to install the valve stem 500 in the first through hole 230 of the housing 200 and avoid the valve stem 500 from falling off.

[0043] In a possible implementation, as shown in Figure 2 The central axis of the valve stem 500 and the central surface of the butterfly plate body 400 have an eccentricity a; the value range of the eccentricity a is 30-50 mm; the valve stem 500 is connected with the first connecting part 450 on the back of the butterfly plate body 400 instead of being connected with the top end of the butterfly plate body 400, so that a preset distance is arranged between the axis of the valve stem 500 and the central surface of the butterfly plate body 400 to form the eccentricity a; the axis of the valve stem 500 deviates from the center of the butterfly plate body 400, so that the upper and lower ends of the butterfly plate body 400 are no longer the rotation axis, and in turn, the excessive extrusion of the upper and lower ends of the butterfly plate body 400 on the valve seat 300 is dispersed and reduced.

[0044] In a possible implementation, as shown in Figure 1 The central axis of the valve stem 500 and the central axis of the housing 200 have an eccentricity b; the value range of the eccentricity b is 5-25 mm.

[0045] In a possible implementation, the load bearing device includes a load bearing adjusting rod 600 and an adjusting bolt 630; one end of the adjusting bolt 630 is connected with one end of the load bearing adjusting rod 600, and the load bearing adjusting rod 600 penetrates the housing 200 and is connected with the butterfly plate body 400. As Figure 2As shown, the load-bearing adjusting rod 600 comprises an embedded block and a bottom column which are integrally formed. The embedded block is located on the top surface of the bottom column. The main body of the embedded block is in a cuboid structure and matches the square hole 461 on the second connecting part 460. The embedded block can be inserted into the square hole 461 of the second connecting part 460. The main body of the bottom column is in a cylindrical structure and the end surface area of the bottom column is larger than that of the embedded block. The bottom column penetrates the side wall of the shell and the end surface of the bottom column connected with the embedded block is suitable for contacting the bottom surface of the second connecting part 460 so as to support the butterfly plate body 400 through the second connecting part 460. The bottom surface of the load-bearing adjusting rod 600 is provided with a clearance hole into which the head of the adjusting bolt 630 is inserted. The adjusting bolt 630 can drive the load-bearing adjusting rod 600 to move along the body length direction, so as to effectively support the butterfly plate body 400 above the load-bearing adjusting rod 600.

[0046] Further, the second shaft sleeve 610 is arranged between the load-bearing adjusting rod 600 and the shell 200. Preferably, the material of the second shaft sleeve 610 is aluminum bronze.

[0047] In a possible implementation, the side of the butterfly plate body 400 away from the pressing plate 410 is provided with a protruding first connecting part 450 and a protruding second connecting part 460. The valve rod 500 is fixedly connected with the first connecting part 450. The load-bearing adjusting rod 600 penetrates the second connecting part 460 and abuts against the bottom surface of the second connecting part 460. Further, the main body of the first connecting part 450 and the main body of the second connecting part 460 are both in a triangular plate structure and are arranged in parallel and perpendicular to the plane where the butterfly plate body 400 is located. The first connecting part 450 is provided with a circular through hole through which the valve rod 500 penetrates. A long cuboid structure protruding key is arranged on the inner side wall of the through hole. When the valve rod 500 penetrates the through hole of the first connecting part 450, the key is embedded into the key groove of the valve rod 500. The second connecting part 460 is provided with a square hole 461 through which the load-bearing adjusting rod 600 penetrates. Preferably, the first connecting part 450, the second connecting part 460 and the butterfly plate body 400 are integrally formed.

[0048] In a possible implementation, the bottom cover 620 is further arranged. The side of the shell 200 connected with the load-bearing device is provided with a second through hole 240 through which the load-bearing adjusting rod 600 penetrates. The bottom cover 620 covers the second through hole 240. The adjusting bolt 630 penetrates the bottom cover 620 and is connected with the load-bearing adjusting rod 600. As shown in FIG. 6, the bottom cover 620 is provided with a through hole 621 through which the adjusting bolt 630 penetrates. The bottom cover 620 is provided with a through hole 622 through which the load-bearing adjusting rod 600 penetrates. Figure 4As shown, a plurality of bolt holes 260 are arranged around the second through hole 240 of the shell 200, and the main body of the bottom cover 620 is in a square plate structure, and a plurality of bolt holes are also arranged around the square plate structure. When the bottom cover 620 covers the second through hole 240 at the bottom end of the shell 200, the bolt holes of the bottom cover 620 correspond to the bolt holes 260 at the bottom of the shell 200 one by one, so that the bottom cover 620 is firmly installed on the outer side wall of the shell 200 through a plurality of bolts. Under the covering effect of the bottom cover 620, the second through hole 240 of the shell 200 and the load adjusting rod 600 can be effectively sealed to avoid fluid leakage from the second through hole 240 at the bottom.

[0049] Further, as shown in Figure 2 The fourth sealing ring 621 is arranged between the shell 200 and the bottom cover 620, and the fourth sealing ring 621 is preferably a graphite sealing ring to effectively seal the gap between the shell 200 and the bottom cover 620. As shown in Figure 4 An annular groove suitable for embedding the fourth sealing ring 621 is arranged on one side of the shell 200 connected to the bottom cover 620.

[0050] Further, as shown in Figure 2 The nut 631 is fixedly arranged on the side of the bottom cover 620 away from the load adjusting rod 600, the adjusting bolt 630 penetrates the nut 631 and the bottom cover 620 in sequence and is threadedly connected with the nut 631, so that the adjusting bolt 630 can be stably installed under the action of the nut 631. When the adjusting bolt 630 is rotated, the adjusting bolt 630 can perform telescopic movement under the action of the nut 631, so as to adjust the degree of the adjusting bolt 630 extending into the inside of the bottom cover 620. Since the head of the adjusting bolt 630 protrudes into the accommodation hole at the bottom of the load adjusting rod 600, when the adjusting bolt 630 moves towards the load adjusting rod 600, the load adjusting rod 600 will be pressed towards the second connecting portion 460, so as to support and lift the second connecting portion 460, and offset the gravity of the butterfly plate body 400.

[0051] In a possible implementation, as shown in Figure 2As shown, the side of the bottom cover 620 away from the shell 200 is provided with an operation pipe 622, the side of the operation pipe 622 away from the bottom cover 620 is provided with a bottom plate 640 covering the opening of the operation pipe 622; the main body of the operation pipe 622 is in a circular pipe structure, the main body of the bottom plate 640 is in a disc structure, and the bottom plate 640 and the end face of the operation pipe 622 are connected together through a plurality of bolts 641. It should be noted that the bottom plate 640 is suitable for sealing the adjusting bolt 630 in the operation pipe 622, so as to further improve the sealing capacity of the butterfly valve; when the position of the butterfly plate body 400 needs to be adjusted, the bottom plate 640 is removed to expose the adjusting bolt 630, and the bottom plate 640 is closed on the operation pipe 622 in time after the adjustment is completed. Preferably, the operation pipe 622 is integrally formed with the bottom cover 620.

[0052] It should be noted that the size of the displacement hole of the load adjusting rod 600 is greater than the size of the head of the adjusting bolt 630, so that when the adjusting bolt 630 rotates, the load adjusting rod 600 can generate linear displacement in the body length direction without rotating the load adjusting rod 600; at the same time, the valve rod 500, the load adjusting rod 600 and the adjusting bolt 630 are coaxially arranged, so as to ensure that when the butterfly plate body 400 rotates around the valve rod 500 as the shaft, the butterfly plate body 400 drives the load adjusting rod 600 to rotate synchronously and does not interfere with the adjusting bolt 630.

[0053] In a possible implementation manner, as shown in Figure 4 As shown, the inner side wall of the shell 200 is provided with a stop block 250, and the stop block 250 is located beside the valve rod 500. The main body of the stop block 250 is in a block structure, and an arc-shaped groove is formed in the side of the stop block 250 facing the valve rod 500 to allow the valve rod 500 to pass through. When the butterfly plate body 400 is rotated by 90 degrees to be completely opened, the back of the butterfly plate body 400 (the side provided with the first connecting part 450 and the second connecting part 460) contacts the side wall of the stop block 250, and the stop block 250 blocks the butterfly plate body 400 to avoid excessive rotation of the butterfly plate body 400 to cause the opening to be unable to be opened to the maximum size, so as to ensure that the maximum diameter can be formed.

[0054] In a possible implementation manner, the actuator 100 comprises a piston cylinder 110, a transmission piston device and a transmission rod 900. The transmission piston device is movably arranged in the cavity of the piston cylinder 110 and connected with the transmission rod 900, one end of the transmission rod 900 is connected with the valve rod 500; the transmission piston device is suitable for driving the valve rod 500 to rotate through the transmission rod 900. As shown in Figure 5 As shown, the piston cylinder 110 is provided with a cavity with four openings, the top opening is suitable for mounting an electrical connector 940, and the bottom opening is suitable for connecting the shell 200 of the valve body; the two side openings are both manholes for maintenance.

[0055] Further, the transmission piston device comprises two oppositely arranged rack moving assemblies, the two rack moving assemblies can move in directions towards or away from each other, the transmission rod 900 is located between the two rack moving assemblies and the two rack moving assemblies are in transmission connection with the transmission rod 900, so as to drive the transmission rod 900 to rotate when the two rack moving assemblies move in the direction towards each other, and drive the transmission rod 900 to rotate in the reverse direction when the two rack moving assemblies move in the direction away from each other.

[0056] Further, each rack moving assembly comprises a piston block 700 and a rack 710, the main body of the piston block 700 is in a block structure and the transverse section is in an "L" structure, the front and back sides of the piston block 700 are in contact with the inner side wall of the piston cylinder 110 and can slide on the inner side wall of the piston cylinder 110, the side of the piston block 700 is opposite to the manhole, the moving direction of the piston block 700 is perpendicular to the body length direction of the transmission rod 900, the rack 710 is arranged on the side of the piston block 700 facing the transmission rod 900, the piston block 700 is suitable for driving the rack 710 to move in the direction perpendicular to the transmission rod 900, the outer side wall of the transmission rod 900 is provided with a gear protruding therefrom, the gear is coaxial with the transmission rod 900, the sawtooth structure of the rack 710 is matched with the gear on the outer side wall of the transmission rod 900, the rack 710 is in meshing connection with the gear of the transmission rod 900, so as to drive the gear to rotate synchronously to realize the rotation of the transmission rod 900 when the piston block 700 drives the rack 710 to move transversely.

[0057] In a possible implementation, the piston block 700 and the rack 710 are connected through two or more bolts 711, the two or more bolts 711 are arranged in sequence along the body length direction of the rack 710. Further, the bolts 711 are provided in three.

[0058] In a possible implementation, as shown in Figure 9 the middle part of the side wall of the piston cylinder 110 is in an arc wall structure, the side of the piston block 700 away from the rack 710 is in an arc surface structure, the arc surface of the piston block 700 has the same curvature as the arc wall of the piston cylinder 110, and the two are matched with each other, the piston cylinder 110 is arranged in the arc wall structure to support and limit the piston block 700, so that the piston block 700 is kept in the middle position of the piston cylinder 110 and the piston block 700 is prevented from falling due to gravity.

[0059] Further, the device further comprises a bearing 730, the side of each piston block 700 away from the rack 710 and the inner side wall of the piston cylinder 110 are both provided with the bearing 730, as shown in Figure 7As shown, the inner side of the bearing 730 is clamped on the side wall of the piston block 700, and the outer side of the bearing 730 is in contact with the inner side wall of the piston cylinder 110. The bearing 730 is arranged to provide support and guidance for the piston block 700, ensure that the piston block 700 can be stably installed in the piston cylinder 110 and produce linear movement in the piston cylinder 110, and reduce friction and wear during movement. Preferably, the bearing 730 is a non-metal bearing.

[0060] In a possible implementation, as shown in Figure 6 As shown, the outer wall of each piston block 700 is provided with an elastic energy storage sealing ring 740. The elastic energy storage sealing ring 740 is sleeved on the outer side of the piston block 700, and the outer wall of the elastic energy storage sealing ring 740 effectively contacts the inner side wall of the piston cylinder 110. The elastic energy storage sealing ring 740 achieves reliable sealing and can meet the requirements of internal gas sealing at liquid oxygen ultra-low temperature, so as to ensure that the high-pressure gas injected can smoothly push the piston block 700.

[0061] In a possible implementation, the piston block 700 of each rack moving assembly is provided with a cover plate 720 on the side of the two end manholes. The cover plate 720 is a plate-shaped structure with a "Π" cross section. The opening end of the "Π" structure is buckled on the side end of the piston block 700, and the cover plate 720 is connected to the piston block 700 by bolts 721.

[0062] Preferably, a non-metallic damping ring 722 is arranged between the outer side wall of the cover plate 720 and the inner side wall of the piston cylinder 110. The non-metallic damping ring 722 is used to achieve the functions of support and guidance, reduce friction, and reduce wear.

[0063] It should be noted that the two rack moving assemblies are the same in structure. The racks 710 of the two rack moving assemblies are respectively located on the two sides of the transmission rod 900 and are simultaneously meshed and connected with the gears of the transmission rod 900 to drive the transmission rod 900 to rotate in the counterclockwise direction when the two rack moving assemblies move in the direction of approaching each other, and to drive the transmission rod 900 to rotate in the clockwise direction when the two rack moving assemblies move in the direction of moving away from each other. The meshing connection of the rack 710 and the gear can improve the speed and agility of the transmission rod 900.

[0064] In a possible implementation, as shown in Figure 8As shown, the side wall of the piston cylinder 110 is provided with an opening cavity connecting pipe nozzle 150, the piston cylinder 110 is provided with an opening cavity channel 151 and two opening cavity openings 152; the opening cavity connecting pipe nozzle 150 is communicated with the opening cavity channel 151, the two opening cavity openings 152 are respectively arranged at the two ends of the piston cylinder 110 and are respectively close to the two end covers 130, the two ends of the opening cavity channel 151 are communicated with the cavity of the piston cylinder 110 through the two opening cavity openings 152, when the high-pressure gas is introduced into the opening cavity connecting pipe nozzle 150, the high-pressure gas is divided into two paths in the opening cavity channel 151 and respectively enters the cavity of the piston cylinder 110 from the two opening cavity openings 152, and the two rack moving assemblies are extruded to make them close to each other.

[0065] In a possible implementation, as shown in Figure 7 As shown, the side wall of the piston cylinder 110 is provided with an opening cavity connecting pipe nozzle 150, the piston cylinder 110 is provided with an opening cavity channel 151 and two opening cavity openings 152; the opening cavity connecting pipe nozzle 150 is communicated with the opening cavity channel 151, the two opening cavity openings 152 are respectively arranged at the two ends of the piston cylinder 110 and are respectively close to the two end covers 130, the two ends of the opening cavity channel 151 are communicated with the cavity of the piston cylinder 110 through the two opening cavity openings 152, when the high-pressure gas is introduced into the opening cavity connecting pipe nozzle 150, the high-pressure gas is divided into two paths in the opening cavity channel 151 and respectively enters the cavity of the piston cylinder 110 from the two opening cavity openings 152, and the two rack moving assemblies are extruded to make them close to each other.

[0066] In summary, the opening and closing of the butterfly plate body 400 are driven by the pneumatic mode.

[0067] In a possible implementation, the transmission rod 900 is provided with a trigger cam 800 at the end away from the valve rod 500, the inner wall of the piston cylinder 110 is provided with two micro switches 830 arranged oppositely, and the trigger end of the micro switch 830 faces the trigger cam 800. As shown in Figure 9 and Figure 10As shown, the top end of the transmission rod 900 is fixedly provided with a spline rod, the center of the trigger cam 800 is provided with a flower-shaped through hole matched with the spline rod, the spline rod is inserted into the flower-shaped through hole to connect the transmission rod 900 with the trigger cam 800, the main body of the trigger cam 800 is in an oval plate structure, both top ends are provided with trigger protrusions 810, the trigger protrusions 810 are suitable for contacting two micro switches 830; the middle axis of the piston cylinder 110 is provided with a let-out hole 820 for the trigger cam 800, the main body of the let-out hole 820 is in a long circular hole structure, the cam 800 can rotate by a certain angle in the let-out hole 820, when the butterfly plate body 400 completely seals the opening of the shell 200, the trigger protrusion 810 at one end of the trigger cam 800 contacts one of the micro switches 830 and triggers, and the valve sealing signal is fed back through the micro switch 830; when the butterfly plate body 400 rotates to completely open the opening of the shell 200, the trigger protrusion 810 at the other end of the trigger cam 800 contacts the other micro switch 830 and triggers, and the valve opening signal is fed back through the micro switch 830.

[0068] In a possible implementation, the outer side of the transmission rod 900 is sleeved with a second limiting ring 980, the second limiting ring 980 is clamped on the outer side wall of the transmission rod 900, and the second limiting ring 980 is located above the trigger cam 800 and is suitable for limiting the trigger cam 800.

[0069] In a possible implementation, the top opening of the piston cylinder 110 is provided with an inner cover 160, the inner cover 160 covers the top of the transmission rod 900 to seal the inside of the piston cylinder 110.

[0070] In a possible implementation, the top of the piston cylinder 110 is provided with an outer cover 120, the outer cover 120 covers the flange connecting disc at the top of the piston cylinder 110 through a plurality of bolts 121 and covers the inner cover 160 inside to seal the inside of the piston cylinder 110; the top center of the outer cover 120 is provided with an electrical connector 940; both micro switches 830 are electrically connected with the electrical connector 940 to deliver the position signal to the outside. After the butterfly valve is opened to the position or closed to the position, the micro switch 830 is connected with the external control system through the electrical connector 940 to feed back the position signal.

[0071] In one possible implementation, a third bushing 960 is provided between the transmission rod 900 and the piston cylinder 110, and the third bushing 960 is located below the trigger cam 800; the material of the third bushing 960 is aluminum bronze. A third limiting ring 970 is provided between the transmission rod 900 and the piston cylinder 110, the third limiting ring 970 is sleeved on the transmission rod 900 and fixedly connected to the transmission rod 900, the third limiting ring 970 is tightly attached to the lower part of the third bushing 960, and a protruding surface is provided in the top opening of the piston cylinder 110, the third limiting ring 970 is placed in contact with the protruding surface; thereby stably installing the transmission rod 900 and preventing the transmission rod 900 from falling off.

[0072] In one possible implementation, a fourth bushing 910 is provided between the transmission rod 900 and the piston cylinder 110. The fourth bushing 910 is made of aluminum bronze to reduce the severe frictional wear caused by its direct contact with the piston cylinder 110.

[0073] In one possible implementation, a packing layer 930 is provided between the transmission rod 900 and the piston cylinder 110. The packing layer 930 fills the packing space formed by the transmission rod 900, the piston cylinder 110, the fourth bushing 910 and the packing gland 920. Preferably, the material of the packing layer 930 is graphite.

[0074] A packing gland 920 is fixedly connected to the bottom of the piston cylinder 110. The packing gland 920 covers the packing space to seal the packing layer 930, reducing the leakage of high-pressure gas along the transmission rod 900, thereby improving the control accuracy of the butterfly valve. The packing gland 920 has a through hole at the position corresponding to the transmission rod 900 to allow the valve stem 500 to be positioned so that its connecting block 530 can pass through the connecting hole 950.

[0075] In one possible implementation, the bottom end of the transmission rod 900 has a rectangular connecting hole 950, which matches the cuboid connecting block 530 at the top of the valve stem 500. The connecting block 530 is inserted into the connecting hole 950 to connect the transmission rod 900 and the valve stem 500. Figure 2 As shown, a clearance groove is provided on the side of the housing 200 connected to the actuator. The clearance groove matches the packing gland 920. When the actuator is placed on the housing 200, the bottom surface of the packing gland 920 is embedded in the clearance groove. Under the connection of the flange connecting plate 270 of the actuator 100 and the housing 200 by multiple bolts 290, the packing gland 920 and the housing 200 are tightly connected. A fifth sealing ring 220 is provided between the packing gland 920 and the housing 200.

[0076] In one possible implementation, such as Figure 5As shown, the manhole is provided with end covers 130, and the two end covers 130 are stably buckled on the connecting flanges 132 on both sides of the piston cylinder 110 through a plurality of bolts 131 and cover the two manholes to seal the manholes, and the end covers 130 are removed when the internal equipment needs to be adjusted.

[0077] In a possible implementation, as shown in the drawings, Figure 6 As shown, the end cover 130 is embedded between the inner side wall of the piston cylinder 110 and one end of the piston cylinder 110, and a sixth sealing ring 133 is arranged therebetween, and the sixth sealing ring 133 is a graphite sealing ring.

[0078] The beneficial effects of the present application are as follows: 1. The present application is a three-eccentric butterfly valve, the conical axis formed by the sealing surface of the valve seat 300 has an eccentric angle R with the axis of the shell; the central axis of the valve rod 500 has an eccentric distance a with the central surface of the disc plate body 400, and the central axis of the valve rod 500 has an eccentric distance b with the central line of the shell; the above is a three-eccentric design, which fundamentally changes the sealing structure, and is no longer a positional seal but a torsional seal, completely relying on the contact surface pressure of the valve seat 300 to achieve the sealing effect, thus solving the difficult problem of zero leakage of the metal valve seat 300, and the contact surface pressure is proportional to the medium pressure, so the high-pressure and high-temperature resistance is also solved.

[0079] 2. The valve body and the disc plate of the existing butterfly valve are mostly made of austenitic stainless steel material which has excellent thermal and mechanical properties at ultra-low temperature but has a relatively large density, resulting in that the weight of the butterfly valve far exceeds the design requirement of the pressurized conveying system, which has great limitations and has become a bottleneck problem to be solved. The present application uses a lightweight aluminum alloy material which has good compatibility with oxygen to manufacture the shell 200, and uses an aluminum alloy to manufacture the disc plate body 400, so as to greatly reduce the weight of the butterfly valve.

[0080] 3. The disc plate structure is adopted in a split type, the disc plate body 400 and the first sealing ring 420 are designed in a split type and are screwed through the pressing plate 410, and on the basis of ensuring the sealing performance, compared with the integrated disc plate, the structure weight is effectively reduced; the lightweight design reduces the overall weight of the butterfly valve, and meets the urgent needs of the new generation of pressurized conveying system for the butterfly valve.

[0081] 4. The double-valve-rod form (valve rod 500 and load-bearing adjusting rod 600) in a segmented type is adopted, compared with the full-shaft type butterfly valve, the actual flow area of the channel is increased, the flow resistance coefficient is reduced, and the weight of the butterfly valve is also effectively reduced.

[0082] 5. The stop block 250 is arranged on the disc plate body 400 to ensure that the disc plate body 400 can be completely opened to form the maximum diameter.

[0083] 6. The application adopts high-temperature alloy material for the light-weight valve seat 300, and adopts high-temperature alloy material for the first sealing ring 420 for the consideration of sealing. Both of them are materials with high hardness and rigidity. If the position of the butterfly plate body 400 is deviated, the stress between them will be uneven, which will easily cause vicious wear. The application designs a load-bearing device to effectively support the butterfly plate body 400, eliminating the influence of the weight of the butterfly plate body on the sealing surface. It ensures the accuracy and stability of the position, effectively contacts the first sealing ring 420 and the valve seat 300 without wear, ensures the sealing performance, and improves the service life of the butterfly valve.

[0084] 7. The butterfly plate body 400 and the valve seat 300 constitute a sealing fit pair, which facilitates the removal of the first sealing ring 420 and the valve seat 300 for separate maintenance and replacement, effectively reducing the difficulty of maintenance.

[0085] 8. To realize the lightweight design of the actuator 100, the piston cylinder 110 and the piston block 700 of the actuator 100 adopt aluminum alloy material with good oxygen compatibility; the transmission rod 900, the gear and the rack 710 adopt high-temperature alloy material to ensure strength, and the rack 710 and the piston block 700 adopt a split structure, thereby reducing the overall weight.

[0086] 9. Through the structural design of the cam 800 and the microswitch 830 and the electrical signal feedback of the electrical connector 940, the opening angle of the butterfly valve can be accurately controlled, effectively improving the control accuracy of the butterfly valve.

[0087] The above has described the embodiments of the application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical application or improvement of technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A large-bore, tight-sealing butterfly valve, characterized by, include: Actuator, valve body and butterfly plate; The valve body includes: a housing, a valve seat, a valve stem, and a load-bearing device; the housing has a cavity with openings at both ends, and the openings at both ends are suitable for fluid to flow in and out; the valve seat is disposed at one of the opening ends of the housing, and the butterfly plate is rotatably disposed inside the valve seat; The drive end of the actuator is connected to one end of the valve stem, and the other end of the valve stem passes through the housing and is connected to the butterfly plate, so that when the actuator drives the valve stem to rotate, it drives the butterfly plate to rotate, thereby opening or closing the opening of the housing; A first sealing ring is provided between the butterfly plate body and the valve seat. The first sealing ring is arranged around the side of the butterfly plate body and protrudes from the edge of the butterfly plate body to contact the inner wall of the valve seat. The pressure plate presses on the side of the first sealing ring away from the butterfly plate body. The first sealing ring is a metal sealing ring; The load-bearing device is located at the bottom of the housing and connected to the butterfly plate body, and is suitable for supporting the butterfly plate body.

2. The large bore, high sealing butterfly valve of claim 1, wherein, The inner wall of the valve seat is tapered, and an eccentric angle is provided between the axis of the tapered surface and the axis of the housing.

3. The large bore, high sealing butterfly valve of claim 1, wherein, The main body of the pressure plate is a ring-shaped plate structure with multiple bolt holes along its circumference. The pressure plate is connected to the butterfly plate body by multiple bolts.

4. The large port, high sealing butterfly valve of claim 1, wherein, A first bushing is provided between the valve stem and the housing.

5. The large port, high sealing butterfly valve of claim 1 wherein, A second sealing ring is provided between the butterfly plate body and the first sealing ring.

6. The large port, high sealing butterfly valve of claim 1, wherein, The load-bearing device includes: a load-bearing adjusting rod and an adjusting bolt; one end of the adjusting bolt abuts against one end of the load-bearing adjusting rod, and the load-bearing adjusting rod passes through the housing and is connected to the butterfly plate body.

7. The large bore, high sealing butterfly valve of claim 6, wherein, The butterfly plate body has a protruding first connecting part and a second connecting part on one side. The valve stem is connected to the first connecting part, and the load-bearing adjustment rod passes through the second connecting part and its side wall abuts against the bottom surface of the second connecting part.

8. The large bore, high sealing butterfly valve of claim 6, wherein, Also includes: Bottom cover; the housing has a through hole on one side connected to the load-bearing device, which is suitable for the load-bearing adjustment rod to pass through. The bottom cover covers the through hole, and the adjustment bolt passes through the bottom cover and is connected to the load-bearing adjustment rod.

9. The large port, high sealing butterfly valve of claim 6, wherein, The actuator includes: a piston cylinder, a transmission piston device, and a transmission rod; the transmission piston device is movably disposed inside the cavity of the piston cylinder and connected to the transmission rod to drive the transmission rod to rotate; one end of the transmission rod is connected to the valve stem, and the transmission piston device is adapted to drive the valve stem to rotate via the transmission rod.

10. The large bore, high sealing butterfly valve of claim 9, wherein, The transmission rod is provided with a trigger cam at the end away from the valve rod, and two microswitches are provided on the inner wall of the piston cylinder, with the trigger ends of the microswitches facing the trigger cam.

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