Butterfly valve capable of conveniently adjusting flow

Abstract

The butterfly valve comprises a valve body, a valve plate, a valve rod and a handle, the handle comprises a holding part and a movable part, a spring is arranged between the holding part and the movable part, a shell is arranged on the valve body, the valve rod is arranged on the shell in a penetrating mode, and a movable rod is arranged outside the valve rod in a sleeving mode. A switching structure which enables the movable rod to be switched between the state that the movable rod and the shell are relatively fixed or the state that the movable rod and the valve rod are relatively fixed is arranged in the shell, a first bevel gear is arranged on the movable rod, a window is formed in the shell, teeth are arranged on the movable part and make contact with the first bevel gear through the window, and a rotating rod is arranged on the shell in a penetrating mode. A hand wheel and a second bevel gear are arranged at the two ends of the rotating rod correspondingly, a mounting cylinder is arranged at the end, close to the valve rod, of the holding part, a mounting groove is formed in the face, facing the mounting cylinder, of the shell, a prismatic mounting end is arranged at the end, away from the valve plate, of the valve rod, a first fixing hole is formed in the mounting end, and a second fixing hole is formed in the mounting cylinder. The flow of the valve can be quickly adjusted and can also be finely adjusted.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a butterfly valve for conveniently adjusting flow. Background Art

[0002] The butterfly valve, also known as the flap valve, is a simple regulating valve that can be used for the on / off control of low-pressure pipeline media. The handle butterfly valve has a simple structure, small size, light weight, and is composed of only a few parts. It is a common type of butterfly valve.

[0003] The existing handle butterfly valve usually includes a valve body, a valve plate, a valve stem, a chuck and a handle. The handle includes a gripping portion and a movable portion hinged to the gripping portion. A spring is arranged between the gripping portion and the movable portion. The end of the movable portion away from the spring can form a limited clamping end with the chuck. The clamping end is kept clamped with the chuck under the action of the spring. When the valve needs to be opened or closed, the operator holds the gripping portion and the movable portion, the spring is compressed by force, and the limited state of the clamping end and the chuck is released. Then, the valve stem can be driven to rotate by the handle, and the valve stem drives the valve plate to rotate, thereby realizing the opening or closing of the valve.

[0004] Application No. 202220520954.5 discloses a handle-clamped butterfly valve that is easy to replace the spring. As shown in the patent, the existing handle butterfly valve only controls the rotation degree of the valve plate through the handle to adjust the flow of the valve. When the flow needs to be finely controlled, the operator needs to have certain operating experience to control the rotation angle of the valve plate, which not only consumes the operator's energy, but also takes a certain amount of time, and the overall efficiency is low. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a handle-type butterfly valve which is more convenient to fine-tune than the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a butterfly valve for convenient flow regulation, comprising a valve body, a valve plate, a valve stem and a handle, the handle comprising a gripping portion and a movable portion hinged to the gripping portion, a spring is arranged between the gripping portion and the movable portion, a shell is arranged on the valve body, the valve stem is passed through the shell, a movable rod is arranged outside the valve stem, a switching structure is arranged in the shell to switch the movable rod between being relatively fixed with the shell or relatively fixed with the valve stem, a bevel gear 1 is arranged on the movable rod, a window is arranged on the shell, teeth that can mesh with the bevel gear 1 are arranged at the end of the movable portion close to the bevel gear 1, the teeth contact the bevel gear 1 through the window, a rotating rod is passed through the shell, and a hand wheel and a bevel gear 2 are arranged at both ends of the rotating rod respectively; the movable rod is fixed with the valve stem under the action of the switching structure Timing, the bevel gear 1 is meshed with the bevel gear 2; the end of the holding portion close to the valve stem is provided with a mounting tube with a prismatic outer wall, and the shell is provided with a mounting groove on the surface facing the mounting tube, the outer wall of the mounting tube along the radial direction of the valve stem has a cross-sectional shape that is consistent with the inner wall of the mounting groove along the radial direction of the valve stem, and 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 1, and the mounting tube is provided with a fixing hole 2, the cross-sectional shape of the inner wall of the mounting tube along the radial direction of the valve stem is consistent with the outer wall of the mounting end along the radial direction of the valve stem; when the mounting tube is sleeved on the mounting end, the fixing hole 1 and the fixing hole 2 are aligned, and there is a gap between the mounting tube and the mounting groove; when the mounting tube is embedded in the mounting groove, there is a gap between the mounting tube and the mounting end.

[0007] By adopting the above scheme, when the valve flow needs to be quickly adjusted, the movable rod remains relatively fixed with the shell under the action of the switching mechanism, the mounting sleeve is sleeved on the mounting end, the fixing hole one and the fixing hole two can both be threaded holes, and the mounting end and the mounting sleeve are fixed by bolts passing through the fixing hole one and the fixing hole two. During operation, the operator applies force to the handle to release the meshing state of the teeth and 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 the valve flow is required, the movable rod is first kept relatively fixed with the valve stem under the action of the switching mechanism, and then the relative fixation between the mounting tube and the mounting end is released, so that the mounting tube is embedded in the mounting groove. At this time, the mounting tube and the housing are kept relatively fixed. During operation, the operator applies force to the handle to disengage the teeth from the bevel gear 1, and at the same time turns the hand wheel. The hand wheel drives the bevel gear 2 to rotate through the rotating rod, so that the bevel gear 1 drives the valve stem to rotate through the movable rod under the action of the bevel gear 2, so that fine adjustment can be achieved. After adjusting to the required flow, release the handle to re-engage the teeth with the bevel gear 1, and the locking can be completed.

[0009] The shell can prevent the bevel gear 1 and the bevel gear 2 from being exposed to the outside world. In particular, when the present invention is used outdoors, the shell can ensure that the bevel gear 1 and the bevel gear 2 are not attached to and corroded by rain or snow.

[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 configuration of the present invention, the switching structure includes a prismatic limiting portion arranged on the valve stem, a limiting cavity arranged on the inner wall of the movable rod for the limiting portion to be embedded and fixed, a protrusion arranged on the outer wall of the movable rod, and a fixing structure arranged in the shell to fix the protrusion to the shell, the vertical distance from the edge of the limiting portion to the axis of the valve stem is greater than the radius of the valve stem, the movable rod includes a handle for controlling the movable rod to move along its own axial direction protruding from the shell in the direction away from the valve plate, the shell is provided with a through hole for the handle to pass through the shell and for the handle to rotate along the axial direction of the movable rod, when the limiting cavity is sleeved outside the limiting portion, the bevel gear one and the bevel gear two are meshed, and there is a gap between the protrusion and the fixing structure; when the protrusion is fixed to the shell through the fixing structure, there is a gap between the limiting cavity and the limiting portion, and there is a gap between the bevel gear one and the bevel gear two.

[0012] With the above solution, when the valve flow is finely adjusted, the limit cavity sleeve is arranged outside the limit part, at this time, the bevel gear 1 and the bevel gear 2 are meshed, and the movable rod and the valve stem remain relatively fixed along the circumference of the valve stem. When it is necessary to switch to the state of rapid flow adjustment, the movable rod is moved by the handle until the protrusion is fixed to the housing through the fixing structure. At this time, the movable rod does not interfere with the rotation of the valve stem along its own circumference, and there is a gap between the bevel gear 1 and the bevel gear 2.

[0013] As a further configuration of the present invention, the fixed structure is a convex ring arranged on the inner wall of the shell, and 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 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 sleeve is arranged outside the limiting part, the protrusion is located on the side of the convex ring close 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 bevel gear one and the bevel gear two.

[0014] The above scheme has a simple structure. When the movable rod needs to be locked with the housing, the handle moves the protrusion along the channel to the side of the protrusion away from the valve plate, and then the handle rotates the movable rod to move the protrusion to the notch of the embedding groove, and then the protrusion is embedded in the embedding groove, so that the movable rod and the housing are locked. Preferably, there are at least two protrusions.

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

[0016] With the above solution, when the handle rotates to the two opposite edges of the window with the valve stem axis as the center, it represents the state of the valve opening to the maximum flow and the state of the valve closing. The window makes it easy for the operator to confirm the rotation angle of the valve plate and to quickly open or close the valve.

[0017] As a further configuration of the present invention, there is a gap between the projections of the through hole and the window on the same radial surface of the valve stem.

[0018] By adopting the above solution, it is convenient to move the movable rod.

[0019] As a further configuration of the present invention, the diameter of the small end of the bevel gear one is greater than the diameter of the large end of the bevel gear two.

[0020] By adopting the above solution, the valve flow can be adjusted more accurately.

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

[0022] By adopting the above solution, when the valve flow needs to be quickly adjusted, the movable rod can be better kept relatively fixed with the housing.

[0023] As a further configuration of the present invention, the mounting end is a quadrangular prism, and two fixing holes 1 are respectively provided on two opposite side walls of the mounting end, and the number of the fixing holes 2 is the same.

[0024] By adopting the above solution, the mounting tube and the mounting end can be kept relatively fixed better.

[0025] As a further configuration of the present invention, an annular buckle is provided at one 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 holding part, a gap exists between the teeth and the bevel gear.

[0026] By adopting the above scheme, when it is necessary to fine-tune the valve flow, the ring buckle is put on the gripping part, and the valve can be adjusted to the predetermined flow by the hand wheel. After adjusting to the predetermined flow, the ring buckle is released, and under the action of the spring, the teeth and the bevel gear are engaged to achieve locking.

[0027] As a further configuration of the present invention, a fixing groove for the ring buckle to be inserted into is provided on the surface of the holding portion facing away from the movable portion, 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 portion to the valve stem axis, and the center of gravity of the ring buckle is located on the side of the ring buckle away from the movable portion; when the spring is compressed to the 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 holding portion away from the valve stem.

[0028] With the above solution, the ring buckle remains embedded in the fixed groove under the action of the spring, and the fixed groove prevents the ring buckle from being separated from the gripping part during the rotation of the hand wheel. When it is necessary to release the ring buckle from the gripping part, the operator holds the movable part and the gripping part tightly, and after the ring buckle is separated from the fixed groove, it swings by itself under the action of gravity, and the release can be achieved. The operator can complete the release work with one hand, which is convenient to operate.

[0029] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Attached Figure 1 It is an overall schematic diagram of a specific embodiment of the present invention;

[0031] Attached Figure 2 It is a cross-sectional schematic diagram of the rapid flow adjustment state of a specific embodiment of the present invention;

[0032] Attached Figure 3 It is a cross-sectional schematic diagram of accurately adjusting the flow state according to a specific embodiment of the present invention;

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

[0034] Attached Figure 5 It is a schematic isometric cross-sectional view of a housing according to a specific embodiment of the present invention;

[0035] Attached Figure 6 It is a schematic diagram of a movable rod according to a specific embodiment of the present invention.

[0036] Valve body 1, valve plate 2, valve stem 3, limiting portion 31, mounting end 32, fixing hole 1 321, handle 4, gripping portion 41, fixing groove 411, movable portion 42, teeth 421, spring 43, mounting tube 44, fixing hole 2 441, annular buckle 45, shell 5, convex ring 51, channel 52, embedding groove 53, through hole 54, window 55, mounting groove 56, movable rod 6, limiting cavity 61, convex block 62, handle 63, bevel gear 1 64, rotating rod 7, hand wheel 71, bevel gear 2 72. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise specified, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. used in the description to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood 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 comprises a valve body 1, a valve plate 2, a valve stem 3 and a handle 4, wherein the handle 4 comprises a gripping portion 41 and a movable portion 42 hinged to the gripping portion 41, a spring 43 is arranged between the gripping portion 41 and the movable portion 42, a housing 5 is arranged on the valve body 1, a valve stem 3 is passed through the housing 5, a movable rod 6 is arranged on the outer sleeve of the valve stem 3, a prismatic limiting portion 31 is arranged on the valve stem 3, a vertical distance from the edge of the limiting portion 31 to the axis of the valve stem 3 is greater than the radius of the valve stem 3, a limiting cavity 61 is arranged on the inner wall of the movable rod 6 for the limiting portion 31 to be embedded and fixed, and the outer wall of the movable rod 6 is cylindrical and has a The protrusion 62, a protruding ring 51 is provided on the inner wall of the shell 5, the protruding ring 51 is located on the side of the limiting portion 31 away from the valve plate 2, the protruding ring 51 is provided with a channel 52 for the protrusion 62 to move axially along the movable rod 6, and the protruding ring 51 is provided with an embedding groove 53 for the protrusion 62 to be embedded on the surface facing away from the valve plate 2; the movable rod 6 includes a handle 63 that protrudes from the shell 5 in the direction away from the valve plate 2 to control the movable rod 6 to move along its own axial direction, and the shell 5 is provided with an outlet hole 54 for the handle 63 to pass through the shell 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] A bevel gear 64 is provided on the movable rod 6, a window 55 is provided on the shell 5, and a tooth 421 which can mesh with the bevel gear 64 is provided at the end of the movable part 42 close to the bevel gear 64, and the tooth 421 contacts with the bevel gear 64 through the window 55. A rotating rod 7 is passed through the shell 5, and a hand wheel 71 and a bevel gear 72 are provided at both ends of the rotating rod 7 respectively; when the limiting cavity 61 is sleeved outside the limiting part 31, the protrusion 62 is located on the side of the protruding ring 51 close to the valve plate 2, the bevel gear 64 and the bevel gear 72 are meshed, and there is a gap between the protrusion 62 and the protruding 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] A prismatic mounting end 32 is provided at one end of the valve stem 3 away from the valve plate 2, and 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. A mounting tube 44 with a prismatic outer wall is provided at one end of the gripping portion 41 close to the valve stem 3, and the cross-section of the inner wall of the mounting tube 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. A fixing hole 1 321 is provided on the mounting end 32, and a fixing hole 2 441 is provided on the mounting tube 44. A mounting groove 56 is provided on the surface of the shell 5 facing the mounting tube 44, and the cross-section of the outer wall of the mounting tube 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 tube 44 is sleeved on the mounting end 32, the fixing hole 1 321 and the fixing hole 2 441 are aligned, and there is a gap between the mounting tube 44 and the mounting groove 56; when the mounting tube 44 is embedded in the mounting groove 56, there is a gap between the mounting tube 44 and the mounting end 32.

[0043] When it is necessary to quickly adjust the valve flow, the protrusion 62 is embedded in the embedding groove 53, the movable rod 6 and the shell 5 remain relatively fixed, and the mounting tube 44 is sleeved on the mounting end 32. At this time, the movable rod 6 does not interfere with the circumferential rotation of the valve stem 3. In this embodiment, the fixing hole 1 321 and the fixing hole 2 441 are both threaded holes, and the mounting end 32 and the mounting tube 44 are fixed by bolts penetrated through the fixing hole 1 321 and the fixing hole 2 441. During operation, the operator applies force to the handle 4 to release the meshing state of the teeth 421 and the bevel gear 1 64, and then rotates the handle 4 around the axis of the valve stem 3 to quickly open or close the valve.

[0044] When fine adjustment of the valve flow is required, first move the movable rod 6 through the handle 63 so that the limiting cavity 61 is sleeved outside the limiting portion 31, and the movable rod 6 and the valve stem 3 remain relatively fixed along the circumference of the valve stem 3. Then release the relative fixation between the mounting tube 44 and the mounting end 32, so that the mounting tube 44 is embedded in the mounting groove 56, and the mounting tube 44 and the housing 5 remain relatively fixed. During operation, the operator applies force to the handle 4 to release the meshing state of the teeth 421 and the bevel gear 1 64, and at the same time rotates the hand wheel 71, and the hand wheel 71 drives the bevel gear 2 72 to rotate through the rotating rod 7, so that the bevel gear 1 64 drives the valve stem 3 to rotate through the movable rod 6 under the action of the bevel gear 2 72, so that fine adjustment can be achieved. After adjusting to the required flow, release the handle 4 to re-engage the teeth 421 with the bevel gear 1 64, and the locking can be completed.

[0045] When the movable rod 6 needs to be locked with the housing 5, the protrusion 62 is moved along the channel 52 to the side of the protruding ring 51 away from the valve plate 2 by the handle 63, and then the movable rod 6 is rotated by the handle 63 to move the protrusion 62 to the notch of the embedding groove 53, and then the protrusion 62 is embedded in the embedding groove 53, so that the movable rod 6 and the housing 5 are locked. This embodiment is provided with three protrusions 62.

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

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

[0048] The shape of the window 55 along the circumference of the valve stem 3 is a quarter arc. When the handle 4 rotates to the two opposite edges of the window 55 with the axis of the valve stem 3 as the center, it represents the state of the valve opening to the maximum flow and the state of the valve closing. The window 55 is convenient for the operator to confirm the rotation angle of the valve plate 2 and to open or close the valve quickly.

[0049] There is a gap between the projections of the through hole 54 and the window 55 on the same radial surface of the valve stem 3, so that the movable rod 6 can be moved conveniently.

[0050] The small end diameter of bevel gear 1 64 is larger than the large end diameter of bevel gear 2 72. The valve flow can be adjusted more accurately.

[0051] The embedding groove 53 is a square groove, and the protrusion 62 is a regular prism. After the protrusion 62 is embedded in the embedding groove 53, it fits with the inner wall of the embedding groove 53. The groove depth of the embedding groove 53 is greater than the axial width of the protrusion 62 along the valve stem 3. When the valve flow needs to be quickly adjusted, the movable rod 6 can be better kept relatively fixed with the housing 5.

[0052] The mounting end 32 is a quadrangular prism. In this embodiment, two fixing holes 1 321 are respectively provided on the two opposite side walls of the mounting end 32, and the number of fixing holes 2 441 is the same, so that the mounting tube 44 and the mounting end 32 can be better kept relatively fixed.

[0053] An annular buckle 45 is provided at one end of the movable part 42 away from the teeth 421, and the annular buckle 45 is rotatably connected to the movable part 42; a fixing groove 411 for the annular buckle 45 to be inserted is provided on the surface of the gripping part 41 facing away from the movable part 42, and the distance from the fixing groove 411 to the axis of the valve stem 3 is greater than the distance from the connection between the annular buckle 45 and the movable part 42 to the axis of the valve stem 3, and 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 sleeved on the fixing groove 411, there is a gap between the teeth 421 and the bevel gear 164. When the spring 43 is compressed to the maximum, there is a gap between the rotation track of the annular buckle 45 and the fixing groove 411, and there is a gap between the rotation track of the annular buckle 45 and the end of the gripping part 41 away from the valve stem 3.

[0054] When the valve flow needs to be finely adjusted, the ring buckle 45 is put on the fixed groove 411. Under the action of the spring 43, the ring buckle 45 remains embedded in the fixed groove 411. The fixed groove 411 prevents the ring buckle 45 from being separated from the gripping portion 41 during the rotation of the hand wheel 71. It is convenient for the operator to concentrate on adjusting the valve to a predetermined flow through the hand wheel 71. After adjusting to the predetermined flow, the operator holds the movable portion 42 and the gripping portion 41 tightly. After the ring buckle 45 is separated from the fixed groove 411, it swings by itself under the action of gravity, and the sleeve state of the ring buckle 45 can be released. Under the action of the spring 43, the teeth 421 are engaged with the bevel gear 1 64, and the locking can be achieved. The operator can achieve the release work with one hand, which is convenient to operate.

[0055] The present invention is not limited to the above-mentioned specific implementation modes. A person skilled in the art may adopt other various specific implementation modes to implement the present invention based on the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. A butterfly valve for convenient flow adjustment, comprising a valve body, a valve plate, a valve stem and a handle, wherein the handle comprises a gripping portion and a movable portion hinged to the gripping portion, a spring is provided between the gripping portion and the movable portion, and is characterized in that: The valve body is provided with a shell, the valve stem is passed through the shell, a movable rod is provided on the outer sleeve of the valve stem, a switching structure is provided in the shell to switch the movable rod between being relatively fixed with the shell or relatively fixed with the valve stem, a bevel gear 1 is provided on the movable rod, a window is provided on the shell, an end of the movable part close to the bevel gear 1 is provided with teeth that can mesh with the bevel gear 1, the teeth contact the bevel gear 1 through the window, a rotating rod is passed through the shell, and a hand wheel and a bevel gear 2 are provided at both ends of the rotating rod respectively; when the movable rod is fixed with the valve stem under the action of the switching structure, the bevel gear 1 meshes with the bevel gear 2; an installation cylinder with a prismatic outer wall is provided at one end of the holding part close to the valve stem, A mounting groove is provided on the surface of the shell body facing the mounting tube, the cross-section of the outer wall of the mounting tube 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, 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 axis of the valve stem is greater than the radius of the valve stem, a fixing hole 1 is provided on the mounting end, a fixing hole 2 is provided on the mounting tube, the cross-section of the inner wall of the mounting tube 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 tube is sleeved on the mounting end, the fixing hole 1 and the fixing hole 2 are aligned, and there is a gap between the mounting tube and the mounting groove; when the mounting tube is embedded in the mounting groove, there is a gap between the mounting tube and the mounting end.

2. A butterfly valve for convenient flow adjustment according to claim 1, characterized in that: The switching structure includes a prismatic limiting portion arranged on the valve stem, a limiting cavity arranged on the inner wall of the movable rod for the limiting portion to be embedded and fixed, a protrusion arranged on the outer wall of the movable rod and a fixing structure arranged in the shell to fix the protrusion to the shell, the vertical distance from the edge of the limiting portion 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 shell away from the valve plate to control the movable rod to move along its own axial direction, the shell is provided with a through hole for the handle to pass through the shell and for the handle to rotate along the axial direction of the movable rod, when the limiting cavity is sleeved outside the limiting portion, the bevel gear one and the bevel gear two are meshed, and there is a gap between the protrusion and the fixing structure; when the protrusion is fixed to the shell through the fixing structure, there is a gap between the limiting cavity and the limiting portion, and there is a gap between the bevel gear one and the bevel gear two.

3. A butterfly valve for convenient flow adjustment according to claim 2, characterized in that: The fixing structure is a convex ring arranged on the inner wall of the shell, and 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 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 sleeve is arranged outside the limiting part, the protrusion is located on the side of the convex ring close 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 bevel gear one and the bevel gear two.

4. A butterfly valve for convenient flow adjustment according to claim 3, characterized in that: The shape of the window along the circumference of the valve stem is a 1 / 4 arc.

5. A butterfly valve for convenient flow regulation according to claim 4, characterized in that: There is a gap between the projection of the through hole and the window on the same radial surface of the valve stem.

6. A butterfly valve for convenient flow regulation according to claim 5, characterized in that: The diameter of the small end of the bevel gear one is greater than the diameter of the large end of the bevel gear two.

7. A butterfly valve for convenient flow regulation according to claim 6, characterized in that: The embedding groove is a square groove, the protrusion is a regular prism, and the protrusion fits with the inner wall of the embedding groove after being embedded in the embedding groove. The groove depth of the embedding groove is greater than or equal to the width of the protrusion along the axial direction of the valve stem.

8. A butterfly valve for convenient flow regulation according to claim 7, characterized in that: The mounting end is a quadrangular prism, and two fixing holes 1 are respectively arranged on two opposite side walls of the mounting end, and the number of the fixing holes 2 is the same.

9. A butterfly valve for convenient flow regulation according to claim 6, 7 or 8, characterized in that: An annular buckle is provided at one 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 holding part, a gap exists between the teeth and the bevel gear.

10. A butterfly valve for convenient flow regulation according to claim 9, characterized in that: A fixing groove for the ring buckle to be inserted into is provided on the surface of the holding portion facing away from the movable portion, 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 portion to the valve stem axis, and the center of gravity of the ring buckle is located on the side of the ring buckle away from the movable portion; when the spring is compressed to the 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 holding portion away from the valve stem.

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