butterfly valve for easy flow adjustment

Abstract

This invention discloses a butterfly valve for convenient flow regulation, comprising a valve body, a valve plate, a valve stem, and a handle. The handle includes a gripping part and a movable part, with a spring between the gripping part and the movable part. A housing is provided on the valve body, and the valve stem passes through the housing. A movable rod is fitted over the valve stem. A switching structure is provided inside the housing to switch the movable rod between being relatively fixed to the housing or relatively fixed to the valve stem. A bevel gear is provided on the movable rod. A window is provided on the housing. Teeth are provided on the movable part, and the teeth contact the bevel gear through the window. A rotating rod passes through the housing, with a handwheel and a bevel gear at each end. A mounting cylinder is provided at the end of the gripping part near the valve stem. A mounting groove is provided on the surface of the housing facing the mounting cylinder. A prismatic mounting end is provided at the end of the valve stem away from the valve plate, with a fixing hole 1 on the mounting end and a fixing hole 2 on the mounting cylinder. Compared with the prior art, this invention can both quickly and precisely regulate the valve flow.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and specifically relates to a butterfly valve that facilitates flow regulation. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. Hand-operated butterfly valves are simple in structure, small in size, and lightweight, consisting of only a few parts, making them a common type of butterfly valve.

[0003] Existing handle-operated butterfly valves typically include a valve body, valve plate, valve stem, chuck, and handle. The handle includes a gripping part and a movable part hinged to the gripping part. A spring is installed between the gripping part and the movable part. The end of the movable part away from the spring can form a locking end with the chuck, which is locked in place by the spring. When the valve needs to be opened or closed, the operator grips the gripping part and the movable part. The spring is compressed, releasing the locking end from the chuck. The handle then rotates the valve stem, which in turn rotates the valve plate, thus opening or closing the valve.

[0004] Application No. 202220520954.5 discloses a handle-type wafer butterfly valve with an easy-to-replace spring. As shown in the patent, the existing handle butterfly valve only controls the degree of rotation of the valve plate by the handle to adjust the flow of the valve. When precise flow control is required, the operator needs to have certain operating experience to control the rotation angle of the valve plate. This not only consumes the operator's energy but also consumes a certain amount of time, resulting in low overall efficiency. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a handle-type butterfly valve that is more convenient for fine-tuning than the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a butterfly valve for convenient flow regulation, comprising a valve body, a valve plate, a valve stem, and a handle. The handle includes a gripping part and a movable part hinged to the gripping part. A spring is provided between the gripping part and the movable part. A housing is provided on the valve body, and the valve stem passes through the housing. A movable rod is sleeved on the valve stem. A switching structure is provided inside the housing to switch the movable rod between being relatively fixed to the housing and being relatively fixed to the valve stem. A bevel gear I is provided on the movable rod. A window is provided on the housing. The end of the movable part near the bevel gear I has teeth that can mesh with the bevel gear I. The teeth contact the bevel gear I through the window. A rotating rod passes through the housing, and a handwheel and a bevel gear II are respectively provided at both ends of the rotating rod. The movable rod remains fixed to the valve stem under the action of the switching structure. During timing, bevel gear one meshes with bevel gear two; the end of the gripping part near the valve stem is provided with a mounting cylinder with a prismatic outer wall, and the surface of the housing facing the mounting cylinder is provided with a mounting groove. The cross-section of the outer wall of the mounting cylinder along the radial direction of the valve stem is consistent with the cross-section of the inner wall of the mounting groove along the radial direction of the valve stem. The end of the valve stem away from the valve plate is provided with a prismatic mounting end. The vertical distance from the edge of the mounting end to the valve stem axis is greater than the radius of the valve stem. The mounting end is provided with a fixing hole one, and the mounting cylinder is provided with a fixing hole two. The cross-section of the inner wall of the mounting cylinder along the radial direction of the valve stem is consistent with the cross-section of the outer wall of the mounting end along the radial direction of the valve stem. When the mounting cylinder is sleeved on the mounting end, the fixing hole one and the fixing hole two are aligned, and there is a gap between the mounting cylinder and the mounting groove. When the mounting cylinder is embedded in the mounting groove, there is a gap between the mounting cylinder and the mounting end.

[0007] Using the above scheme, when the valve flow needs to be quickly adjusted, the movable rod remains relatively fixed to the housing under the action of the switching mechanism. The mounting sleeve is fitted on the mounting end. Both fixing hole one and fixing hole two can be threaded holes. The mounting end and the mounting sleeve are fixed by bolts passing through fixing hole one and fixing hole two. During operation, the operator applies force to the handle to disengage the teeth from the bevel gear one, and then rotates the handle around the axis of the valve stem to quickly open or close the valve.

[0008] When fine adjustment of valve flow is required, first, keep the movable rod relatively fixed to the valve stem under the action of the switching mechanism. Then, release the relative fixation between the mounting cylinder and the mounting end, allowing the mounting cylinder to embed into the mounting groove. At this time, the mounting cylinder and the housing remain relatively fixed. During operation, the operator applies force to the handle to disengage the teeth from the first bevel gear. Simultaneously, turn the handwheel. The handwheel drives the second bevel gear through the rotating rod, causing the first bevel gear to rotate through the movable rod, thus achieving fine adjustment. After adjusting to the required flow rate, release the handle to re-engage the teeth with the first bevel gear, completing the locking process.

[0009] The housing prevents bevel gear 1 and bevel gear 2 from being exposed to the outside environment. In particular, when the invention is used outdoors, the housing ensures that bevel gear 1 and bevel gear 2 are protected from rain, snow, and corrosion.

[0010] Compared with the prior art, the present invention can both quickly adjust the valve flow rate and finely adjust the valve flow rate.

[0011] As a further feature of the present invention, the switching structure includes a prismatic limiting part disposed on the valve stem, a limiting cavity disposed on the inner wall of the movable rod for the limiting part to be embedded and fixed, a protrusion disposed on the outer wall of the movable rod, and a fixing structure disposed within the housing for fixing the protrusion to the housing. The vertical distance from the edge of the limiting part to the axis of the valve stem is greater than the radius of the valve stem. The movable rod includes a handle that protrudes from the housing in a direction away from the valve plate and controls the movable rod to move along its own axial direction. The housing is provided with a through hole for the handle to pass through the housing and for the handle to rotate along the axial direction of the movable rod. When the limiting cavity is fitted outside the limiting part, the first bevel gear and the second bevel gear mesh, and there is a gap between the protrusion and the fixing structure. When the protrusion is fixed to the housing by the fixing structure, there is a gap between the limiting cavity and the limiting part, and there is a gap between the first bevel gear and the second bevel gear.

[0012] Using the above scheme, when finely adjusting the valve flow rate, the limiting cavity is fitted outside the limiting part. At this time, bevel gear one and bevel gear two are meshed, and the movable rod and valve stem remain relatively fixed along the circumference of the valve stem. When it is necessary to switch to the state of rapid flow rate adjustment, the movable rod is moved by the handle until the protrusion is fixed to the housing by the fixing structure. At this time, the movable rod does not interfere with the valve stem's rotation along its own circumference, and there is a gap between bevel gear one and bevel gear two.

[0013] As a further feature of the present invention, the fixing structure is a convex ring disposed on the inner wall of the housing. The convex ring is located on the side of the limiting part away from the valve plate. The convex ring is provided with a channel for the protrusion to move axially along the movable rod. The surface of the convex ring facing away from the valve plate is provided with an embedding groove for the protrusion to be embedded. When the limiting cavity is sleeved outside the limiting part, the protrusion is located on the side of the convex ring closer to the valve plate. When the protrusion is embedded in the limiting groove, there is a gap between the limiting sleeve and the limiting part, and there is a gap between the first bevel gear and the second bevel gear.

[0014] The above solution has a simple structure. When locking the movable rod to the housing, the handle is used to move the protrusion along the channel to the side of the convex ring away from the valve plate. Then, the handle is used to rotate the movable rod, moving the protrusion to the groove of the embedding slot. Finally, the protrusion is embedded into the embedding slot, thus locking the movable rod to the housing. Preferably, there are at least two protrusions.

[0015] As a further feature of the invention, the window is a 1 / 4 circular arc along the circumference of the valve stem.

[0016] Using the above scheme, when the handle is rotated around the valve stem axis to opposite edges of the window, it represents the valve being open to its maximum flow rate and closed, respectively. The window allows operators to easily confirm the valve plate's rotation angle, facilitating quick opening or closing of the valve.

[0017] As a further feature of the invention, there is a gap between the projection of the through hole and the window onto the same radial plane of the valve stem.

[0018] The above solution facilitates the movement of the movable pole.

[0019] As a further feature of the present invention, the small end diameter of the first bevel gear is larger than the large end diameter of the second bevel gear.

[0020] Using the above method, the valve flow rate can be adjusted more precisely.

[0021] As a further feature of the present invention, the embedding groove is a square groove, the protrusion is a regular prism, the protrusion fits against the inner wall of the embedding groove after being embedded, and the groove depth of the embedding groove is greater than or equal to the width of the protrusion along the valve stem axial direction.

[0022] By adopting the above solution, when it is necessary to quickly adjust the valve flow rate, the movable rod can be better kept relatively fixed with the housing.

[0023] As a further feature of the present invention, the mounting end is a quadrangular prism, and two fixing holes are respectively provided on the two opposite side walls of the mounting end, and the number of fixing holes is the same.

[0024] The above solution ensures that the mounting cylinder and the mounting end remain relatively fixed.

[0025] As a further feature of the present invention, an annular buckle is provided at the end of the movable part away from the teeth, and the annular buckle is rotatably connected to the movable part; when the annular buckle is sleeved on the gripping part, there is a gap between the teeth and the bevel gear.

[0026] Using the above solution, when precise adjustment of valve flow is required, the ring buckle is placed on the grip, allowing you to focus on adjusting the valve to the predetermined flow rate using the handwheel. After adjusting to the predetermined flow rate, the ring buckle is released, and the teeth engage with the bevel gear under the action of the spring, thus achieving locking.

[0027] As a further feature of the present invention, the gripping part has a fixing groove on the side facing away from the movable part for the ring buckle to be inserted. The distance from the fixing groove to the valve stem axis is greater than the distance from the connection between the ring buckle and the movable part to the valve stem axis. The center of gravity of the ring buckle is located on the side of the ring buckle away from the movable part. When the spring is compressed to its maximum, there is a gap between the rotation trajectory of the ring buckle and the fixing groove, and at the same time, there is a gap between the rotation trajectory of the ring buckle and the end of the gripping part away from the valve stem.

[0028] Using the above solution, the ring buckle remains embedded in the fixing groove under the action of the spring, and the fixing groove prevents the ring buckle from disengaging from the grip during the rotation of the handwheel. To release the ring buckle from the grip, the operator grips both the moving part and the grip; after the ring buckle disengages from the fixing groove, it swings off under gravity, thus releasing the buckle. The operator can perform the release operation with one hand, making it convenient.

[0029] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0030] Appendix Figure 1 This is a schematic diagram of an overall embodiment of the present invention;

[0031] Appendix Figure 2 This is a cross-sectional schematic diagram illustrating the rapid flow rate adjustment state in a specific embodiment of the present invention;

[0032] Appendix Figure 3 This is a cross-sectional schematic diagram illustrating the precise adjustment of flow rate status in a specific embodiment of the present invention;

[0033] Appendix Figure 4 This is a schematic diagram of the handle according to a specific embodiment of the present invention;

[0034] Appendix Figure 5 This is a schematic equiaxial side sectional view of the housing according to a specific embodiment of the present invention;

[0035] Appendix Figure 6 This is a schematic diagram of the movable rod in a specific embodiment of the present invention.

[0036] Valve body 1, valve plate 2, valve stem 3, limiting part 31, mounting end 32, fixing hole one 321, handle 4, grip part 41, fixing groove 411, moving part 42, teeth 421, spring 43, mounting cylinder 44, fixing hole two 441, ring buckle 45, housing 5, convex ring 51, channel 52, embedded groove 53, through hole 54, window 55, mounting groove 56, moving rod 6, limiting cavity 61, protrusion 62, handle 63, bevel gear one 64, rotating rod 7, handwheel 71, bevel gear two 72. Detailed Implementation

[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that, unless otherwise specified, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] Specific embodiments of the present invention are shown in the accompanying drawings.

[0040] A butterfly valve for convenient flow regulation includes a valve body 1, a valve plate 2, a valve stem 3, and a handle 4. The handle 4 includes a gripping part 41 and a movable part 42 hinged to the gripping part 41. A spring 43 is provided between the gripping part 41 and the movable part 42. A housing 5 is provided on the valve body 1. The valve stem 3 passes through the housing 5. A movable rod 6 is sleeved on the valve stem 3. A prism-shaped limiting part 31 is provided on the valve stem 3. The vertical distance from the edge of the limiting part 31 to the axis of the valve stem 3 is greater than the radius of the valve stem 3. A limiting cavity 61 is provided on the inner wall of the movable rod 6 for the limiting part 31 to be embedded and fixed. The outer wall of the movable rod 6 is cylindrical and has a limiting cavity 61 on the outer wall. The inner wall of the housing 5 has a protrusion 62 and a protruding ring 51. The protruding ring 51 is located on the side of the limiting part 31 away from the valve plate 2. The protruding ring 51 has a channel 52 for the protruding 62 to move axially along the movable rod 6. The surface of the protruding ring 51 facing away from the valve plate 2 has an embedding groove 53 for the protruding 62 to be embedded in. The movable rod 6 includes a handle 63 that protrudes from the housing 5 in the direction away from the valve plate 2 and moves axially along its own axis. The housing 5 has a through hole 54 for the handle 63 to pass through the housing 5 and for the handle 63 to rotate axially along the movable rod 6. In this embodiment, the handle 63 is fixed to the surface of the bevel gear 64 facing away from the valve plate 2.

[0041] The movable rod 6 is provided with a bevel gear 64, and the housing 5 is provided with a window 55. The end of the movable part 42 near the bevel gear 64 is provided with teeth 421 that can mesh with the bevel gear 64. The teeth 421 contact the bevel gear 64 through the window 55. The housing 5 is provided with a rotating rod 7, and the two ends of the rotating rod 7 are respectively provided with a handwheel 71 and a bevel gear 72. When the limiting cavity 61 is sleeved outside the limiting part 31, the protrusion 62 is located on the side of the convex ring 51 near the valve plate 2, the bevel gear 64 and the bevel gear 72 mesh, and there is a gap between the protrusion 62 and the convex ring 51. When the protrusion 62 is embedded in the limiting groove, there is a gap between the limiting cavity 61 and the limiting part 31, and there is a gap between the bevel gear 64 and the bevel gear 72.

[0042] The valve stem 3 has a prismatic mounting end 32 at the end away from the valve plate 2. The vertical distance from the edge of the mounting end 32 to the axis of the valve stem 3 is greater than the radius of the valve stem 3. The gripping part 41 has a mounting cylinder 44 with a prismatic outer wall at the end near the valve stem 3. The cross-section of the inner wall of the mounting cylinder 44 along the radial direction of the valve stem 3 is consistent with the cross-section of the outer wall of the mounting end 32 along the radial direction of the valve stem 3. The mounting end 32 has a fixing hole 321, and the mounting cylinder 44 has a fixing hole 441. The surface of the housing 5 facing the mounting cylinder 44 has a mounting groove 56. The cross-section of the outer wall of the mounting cylinder 44 along the radial direction of the valve stem 3 is consistent with the cross-section of the inner wall of the mounting groove 56 along the radial direction of the valve stem 3. When the mounting cylinder 44 is fitted onto the mounting end 32, the fixing hole 321 and the fixing hole 441 are aligned, and there is a gap between the mounting cylinder 44 and the mounting groove 56. When the mounting cylinder 44 is embedded in the mounting groove 56, there is a gap between the mounting cylinder 44 and the mounting end 32.

[0043] When rapid adjustment of valve flow is required, protrusion 62 is embedded in embedded groove 53, movable rod 6 remains relatively fixed to housing 5, and mounting cylinder 44 is sleeved on mounting end 32. At this time, movable rod 6 does not interfere with valve stem 3 rotating around its own circumference. In this embodiment, fixing hole one 321 and fixing hole two 441 are both threaded holes. Mounting end 32 and mounting cylinder 44 are fixed by bolts passing through fixing hole one 321 and fixing hole two 441. During operation, the operator applies force to handle 4 to disengage teeth 421 from bevel gear one 64, and then rotates handle 4 around the axis of valve stem 3 to quickly open or close the valve.

[0044] When fine adjustment of valve flow is required, first move the movable rod 6 using handle 63 so that the limiting cavity 61 is fitted outside the limiting part 31, and the movable rod 6 and valve rod 3 remain relatively fixed along the circumference of the valve rod 3. Then release the relative fixation between the mounting cylinder 44 and the mounting end 32, so that the mounting cylinder 44 is embedded in the mounting groove 56. At this time, the mounting cylinder 44 and the housing 5 remain relatively fixed. During operation, the operator applies force to the handle 4 to disengage the teeth 421 from the bevel gear 64, and at the same time rotates the handwheel 71. The handwheel 71 drives the bevel gear 72 to rotate through the rotating rod 7, so that the bevel gear 64 drives the valve rod 3 to rotate through the movable rod 6 under the action of the bevel gear 72, thereby achieving fine adjustment. After adjusting to the required flow, release the handle 4 to re-engage the teeth 421 with the bevel gear 64, thus completing the locking.

[0045] When it is necessary to lock the movable rod 6 to the housing 5, move the protrusion 62 along the channel 52 to the side of the convex ring 51 away from the valve plate 2 by using the handle 63, then rotate the movable rod 6 by using the handle 63 to move the protrusion 62 to the opening of the embedding groove 53, and then embed the protrusion 62 into the embedding groove 53 to complete the locking of the movable rod 6 to the housing 5. This embodiment has three protrusions 62.

[0046] The housing 5 prevents bevel gear 1 64 and bevel gear 2 72 from being exposed to the outside environment. In particular, when this embodiment is used outdoors, the housing 5 can ensure that bevel gear 1 64 and bevel gear 2 72 are not affected by rain, snow or corrosion.

[0047] Compared with the prior art, this embodiment can both quickly adjust the valve flow rate and finely adjust the valve flow rate.

[0048] The window 55 is a quarter-circle arc along the circumference of the valve stem 3. When the handle 4 is rotated around the axis of the valve stem 3 to opposite edges of the window 55, it represents the valve being open to its maximum flow rate and closed, respectively. The window 55 allows the operator to easily confirm the rotation angle of the valve plate 2, facilitating quick opening or closing of the valve.

[0049] There is a gap between the projections of the through hole 54 and the window 55 onto the same radial plane of the valve stem 3. This facilitates the movement of the movable rod 6.

[0050] The small end diameter of bevel gear 64 is larger than the large end diameter of bevel gear 72. This allows for more precise regulation of valve flow.

[0051] The insert groove 53 is a square groove, and the protrusion 62 is a regular prism. After the protrusion 62 is inserted into the insert groove 53, it fits against the inner wall of the insert groove 53. The depth of the insert groove 53 is greater than the width of the protrusion 62 along the axial direction of the valve stem 3. This allows the movable rod 6 to be better fixed relative to the housing 5 when the valve flow needs to be quickly adjusted.

[0052] The mounting end 32 is a quadrangular prism. In this embodiment, two fixing holes 321 are provided on the opposite side walls of the mounting end 32, and the number of fixing holes 441 is the same. This ensures that the mounting cylinder 44 and the mounting end 32 are better kept relatively fixed.

[0053] An annular buckle 45 is provided at the end of the movable part 42 away from the tooth 421, and the annular buckle 45 is rotatably connected to the movable part 42. A fixing groove 411 is provided on the surface of the gripping part 41 facing away from the movable part 42 for the annular buckle 45 to engage. The distance from the fixing groove 411 to the axis of the valve stem 3 is greater than the distance from the connection point between the annular buckle 45 and the movable part 42 to the axis of the valve stem 3. The center of gravity of the annular buckle 45 is located on the side of the annular buckle 45 away from the movable part 42. When the annular buckle 45 is fitted onto the fixing groove 411, there is a gap between the tooth 421 and the bevel gear 64. When the spring 43 is compressed to its maximum, there is a gap between the rotation trajectory of the annular buckle 45 and the fixing groove 411, and simultaneously, there is a gap between the rotation trajectory of the annular buckle 45 and the end of the gripping part 41 away from the valve stem 3.

[0054] When precise adjustment of valve flow is required, the annular buckle 45 is fitted onto the fixed groove 411. Under the action of the spring 43, the annular buckle 45 remains embedded in the fixed groove 411, preventing the annular buckle 45 from disengaging from the grip part 41 during the rotation of the handwheel 71. This allows the operator to focus on adjusting the valve to the predetermined flow rate using the handwheel 71. After adjusting to the predetermined flow rate, the operator grips the movable part 42 and the grip part 41. The annular buckle 45 disengages from the fixed groove 411 and swings under gravity, releasing the buckle 45 from its fitted state. Under the action of the spring 43, the teeth 421 engage with the bevel gear 64, achieving locking. The operator can perform the release operation with one hand, making it convenient.

[0055] This invention is not limited to the specific embodiments described above. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any simple changes or modifications made to the design structure and concept of this invention fall within the protection scope of this invention.

Claims

1. A butterfly valve for convenient flow regulation, comprising a valve body, a valve plate, a valve stem, and a handle, wherein the handle includes a gripping part and a movable part hinged to the gripping part, and a spring is provided between the gripping part and the movable part, characterized in that: The valve body has a housing, the valve stem passes through the housing, and a movable rod is fitted over the valve stem. The housing contains a switching structure that allows the movable rod to switch between being relatively fixed to the housing and relatively fixed to the valve stem. The movable rod has a first bevel gear. The housing has a window. The end of the movable part near the first bevel gear has teeth that mesh with the first bevel gear. The teeth contact the first bevel gear through the window. A rotating rod passes through the housing, and both ends of the rotating rod have a handwheel and a second bevel gear, respectively. When the movable rod is fixed to the valve stem under the action of the switching structure, the first bevel gear meshes with the second bevel gear. The gripping part has a handle at one end near the valve stem. A mounting cylinder with a prismatic outer wall has a mounting groove on the surface of the housing facing the mounting cylinder. The cross-section of the outer wall of the mounting cylinder along the radial direction of the valve stem is identical to the cross-section of the inner wall of the mounting groove along the radial direction of the valve stem. A prismatic mounting end is provided at the end of the valve stem away from the valve plate. The vertical distance from the edge of the mounting end to the valve stem axis is greater than the radius of the valve stem. A fixing hole one is provided on the mounting end, and a fixing hole two is provided on the mounting cylinder. The cross-section of the inner wall of the mounting cylinder along the radial direction of the valve stem is identical to the cross-section of the outer wall of the mounting end along the radial direction of the valve stem. When the mounting cylinder is fitted onto the mounting end, fixing holes one and two are aligned, and a gap exists between the mounting cylinder and the mounting groove. The mounting cylinder is embedded... When inserted into the mounting slot, there is a gap between the mounting cylinder and the mounting end; the switching structure includes a prismatic limiting part on the valve stem, a limiting cavity on the inner wall of the movable rod for embedding and fixing the limiting part, a protrusion on the outer wall of the movable rod, and a fixing structure inside the housing for fixing the protrusion to the housing. The vertical distance from the edge of the limiting part to the axis of the valve stem is greater than the radius of the valve stem. The movable rod includes a handle that protrudes from the housing in a direction away from the valve plate and controls the movable rod to move axially. The housing has a through hole for the handle to pass through the housing and rotate axially along the movable rod. When the limiting cavity is fitted outside the limiting part, the first bevel gear and the second bevel gear mesh. There is a gap between the protrusion and the fixing structure; when the protrusion is fixed to the housing by the fixing structure, there is a gap between the limiting cavity and the limiting part, and there is a gap between the first bevel gear and the second bevel gear; the fixing structure is a convex ring set on the inner wall of the housing, the convex ring is located on the side of the limiting part away from the valve plate, the convex ring is provided with a channel for the protrusion to move axially along the movable rod, and the convex ring is provided with an embedding groove for the protrusion to be embedded on the surface of the convex ring facing away from the valve plate; when the limiting cavity is sleeved outside the limiting part, the protrusion is located on the side of the convex ring closer to the valve plate; when the protrusion is embedded in the limiting groove, there is a gap between the limiting cavity and the limiting part, and there is a gap between the first bevel gear and the second bevel gear.

2. The butterfly valve for convenient flow adjustment according to claim 1, characterized in that: The window is shaped like a quarter-circumference arc along the valve stem.

3. The butterfly valve for convenient flow adjustment according to claim 2, characterized in that: There is a gap between the projection of the through hole and the window onto the same radial plane of the valve stem.

4. A butterfly valve for convenient flow adjustment according to claim 3, characterized in that: The small end diameter of bevel gear one is larger than the large end diameter of bevel gear two.

5. A butterfly valve for convenient flow adjustment according to claim 4, characterized in that: The embedding groove is a square groove, and the protrusion is a regular prism. After the protrusion is embedded in the embedding groove, it fits against the inner wall of the embedding groove. The depth of the embedding groove is greater than or equal to the width of the protrusion along the valve stem axis.

6. A butterfly valve for convenient flow adjustment according to claim 5, characterized in that: The mounting end is a quadrangular prism, and two fixing holes are provided on the opposite two side walls of the mounting end, and the number of fixing holes is the same.

7. A butterfly valve for convenient flow adjustment according to claim 4, 5, or 6, characterized in that: The movable part is provided with a ring buckle at the end away from the teeth, and the ring buckle is rotatably connected to the movable part; when the ring buckle is sleeved on the grip part, there is a gap between the teeth and the bevel gear.

8. A butterfly valve for convenient flow adjustment according to claim 7, characterized in that: The gripping part has a fixing groove on the side facing away from the movable part for the ring buckle to be inserted. The distance from the fixing groove to the valve stem axis is greater than the distance from the connection between the ring buckle and the movable part to the valve stem axis. The center of gravity of the ring buckle is located on the side of the ring buckle away from the movable part. When the spring is compressed to its maximum, there is a gap between the rotation trajectory of the ring buckle and the fixing groove, and at the same time, there is a gap between the rotation trajectory of the ring buckle and the end of the gripping part away from the valve stem.

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