Eccentric butterfly valve with flow regulation function

Abstract

The invention belongs to the field of valves, and particularly relates to an eccentric butterfly valve with a flow regulation function, which comprises a valve body for medium transmission, a transmission mechanism comprises a valve rod frame arranged at the upper part of the valve body, a transmission device is arranged at the upper part of the valve rod frame, and one end of the transmission device is connected to a hand wheel; the butterfly plate mechanism comprises a valve rod connected with the middle of the transmission device, the valve rod is symmetrically sleeved with eccentric frames, and one side of each eccentric frame is connected with a partition plate. The combination of the turning plate and the transmission through hole achieves stable adjustment of micro flow, the transmission through hole formed in the butterfly plate is blocked by the turning plate, flow grading adjustment is achieved by changing the overlapping area of the turning plate and the transmission through hole in the butterfly plate, and the motor drives the turning plate connected with the turning plate frame to rotate through the direction adjusting rod. The fan-shaped structure and the transmission through hole in the butterfly plate form a dynamic coverage relation, and accurate control over the angle of the turning plate is achieved. When small-flow conveying is carried out, the situation that the butterfly plate directly rubs the valve body when the opening degree is small, and consequently a sealing mechanism is damaged can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of valves, and in particular to an eccentric butterfly valve with a flow regulating function. Background Art

[0002] The core feature of an eccentric butterfly valve is that the valve stem axis is offset from both the disc and body centers. This design utilizes a tapered sealing pair to achieve asymmetric torque distribution. Compared to concentric butterfly valves, this eccentric design creates a "disengagement-before-engagement" motion pattern between the disc and the seat during opening and closing, significantly reducing friction, torque, and wear.

[0003] During the use of the eccentric butterfly valve, its flow rate is related to the opening and closing degree of the angle between the butterfly plate and the valve channel before and after the rotation of the butterfly plate. When the butterfly plate is rotated to open and close when the flow demand is small, the small friction and scratches during the rotation of the butterfly plate will cause the sealing structure between it and the valve channel to fail. In addition, when the medium is transmitted at a small flow rate, it is difficult to accurately control the flow rate, resulting in excessive transmission of the medium, which is insufficient. Summary of the Invention (1) Purpose of the invention In order to solve the technical problems existing in the background technology, the present invention proposes an eccentric butterfly valve with flow regulation function, which has the characteristics of built-in flow regulation mechanism to assist medium in small flow transmission and less damage to the valve body during the small flow medium transmission process.

[0004] (2) Technical solution To solve the above technical problems, the present invention provides an eccentric butterfly valve with a flow regulation function, comprising a valve body for medium transmission, a transmission mechanism comprising a valve stem frame mounted on the upper part of the valve body, a transmission device mounted on the upper part of the valve stem frame, and one end of the transmission device connected to a handwheel; The butterfly plate mechanism includes a valve stem connected to the middle of the transmission device, an eccentric frame symmetrically sleeved on the outside of the valve stem, a partition plate connected to one side of the eccentric frame, and a butterfly plate for closing the valve channel connected to the partition plate; The flow regulating mechanism includes a ring frame formed on the outer periphery of the partition, the ring frame has a built-in rotatable flap, and a plurality of transmission holes opened on the butterfly plate are provided on the opposite side of the drainage groove; The driving mechanism includes a rod frame symmetrically mounted on the partition, a direction-adjusting rod running through the interior of the rod frame, the direction-adjusting rod being connected to the output end of the motor, and a flap frame connected to the flap being sleeved on the outer wall; The power supply mechanism comprises a waterproof shell arranged outside the motor, wherein the waterproof shell has a built-in power supply terminal seat connected to the motor, and the power supply terminal seat is connected to an external power source through a cable sleeve passing through the valve stem.

[0005] Preferably, the two ends of the valve body are respectively a liquid inlet end and a liquid outlet end, and the flow regulating mechanism is arranged between the liquid inlet end and the liquid outlet end.

[0006] Preferably, the combined structure of the butterfly plate and the partition is connected to the eccentric frame, the butterfly plate and the partition are double-layered, and both rotate synchronously with the eccentric frame and the valve stem.

[0007] Preferably, the flap is a "fan-shaped" structure. When the flap is embedded in the clamping space between the partition and the ring frame, the transmission through hole opened on the butterfly plate is blocked by the flap.

[0008] Preferably, the flap and the flap frame rotate forward and reverse along the axis of the adjustment rod, and drainage grooves are spaced apart on the end surface of the flap facing the butterfly plate.

[0009] Preferably, the inner cavity of the valve body is provided with a raised sealing convex ring, the inner wall of the sealing convex ring is an "inclined" structure, and the sealing convex ring is adapted to the sealing ring frame provided on the outside of the butterfly plate.

[0010] Preferably, the sealing mechanism includes a gas cylinder rack arranged on one side of the butterfly plate, a gas cylinder is clamped in the gas cylinder rack, a charging and discharging end seat is installed on the upper part of the gas cylinder, and a tee is installed at one end of the charging and discharging end seat passing through the butterfly plate, and the two ends of the tee are respectively connected to a first airbag component penetrating the ring frame and a second airbag component penetrating the sealing ring frame.

[0011] Preferably, the ring frame is a "ring-shaped" structure sleeved on the outer periphery of the partition, and the first airbag component clamped in the ring frame is a deformable component, and its end surface facing the flap is a deformable surface.

[0012] Preferably, the second airbag component is clamped in the clamping groove formed on the sealing ring frame, and the end surface of the second airbag component close to the inner wall of the sealing convex ring is a deformation surface.

[0013] Preferably, solenoid valves are provided in the two branches of the three-way pipe toward the first airbag component and the second airbag component, and the solenoid valves are used to control the opening and closing of the gas tank, the charging and discharging end seat and the three-way pipe branch.

[0014] The above-mentioned technical solution of the present invention has the following beneficial technical effects: the combination of the flap and the transmission hole enables stable regulation of small flow rates. The transmission hole on the butterfly plate is blocked by the flap. By varying the overlapping area between the flap and the transmission hole on the butterfly plate, flow rate regulation is achieved in stages. The motor drives the flap connected to the flap frame to rotate via the steering rod. The fan-shaped structure forms a dynamic overlapping relationship with the transmission hole on the butterfly plate, enabling precise control of the flap angle. When conveying small flows, this prevents the butterfly plate from directly rubbing against the valve body at a small opening, potentially damaging the sealing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the present invention; Figure 3 Schematic diagram of the butterfly plate mechanism structure of the present invention; Figure 4 Schematic diagram of the valve channel closing structure of the present invention; Figure 5 This is a schematic diagram of the valve channel opening structure of the present invention; Figure 6 Schematic diagram of the flow regulating mechanism structure of the present invention; Figure 7 It is a structural schematic diagram of the sealing mechanism of the present invention; Figure 8 It is a schematic structural diagram of the power supply mechanism of the present invention.

[0016] Reference numerals: 1. Valve body; 11. Liquid inlet end; 12. Liquid outlet end; 21. Valve stem frame; 22. Transmission device; 23. Handwheel; 31. Valve stem; 32. Eccentric frame; 33. Partition; 34. Butterfly plate; 41. Ring frame; 42. Flap; 43. Drainage groove; 44. Transmission through hole; 51. Rod frame; 52. Adjustment rod; 53. Motor; 54. Flap frame; 61. Sealing cam; 62. Sealing ring frame; 71. Gas tank frame; 72. Gas tank; 73. Charge and discharge terminal seat; 74. Tee; 75. First airbag component; 76. Second airbag component; 81. Waterproof shell; 82. Cable sleeve; 83. Power supply terminal seat. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0018] like Figure 1-8 As shown, the eccentric butterfly valve with flow regulation function proposed by the present invention includes a valve body 1 for medium transmission, a transmission mechanism includes a valve stem frame 21 installed on the upper part of the valve body 1, a transmission device 22 is installed on the upper part of the valve stem frame 21, and one end of the transmission device 22 is connected to a handwheel 23; The butterfly plate mechanism includes a valve stem 31 connected to the middle of the transmission device 22. An eccentric frame 32 is symmetrically sleeved on the outside of the valve stem 31. A partition 33 is connected to one side of the eccentric frame 32. A butterfly plate 34 that closes the valve channel is connected to the partition 33. The two ends of the valve body 1 are respectively a liquid inlet end 11 and a liquid outlet end 12. The flow regulating mechanism is arranged between the liquid inlet end 11 and the liquid outlet end 12. The medium is input into the valve body 1 through the liquid inlet end 11, and the worm gear in the transmission device 22 is driven by the handwheel 23, which drives the valve stem 31 passing through the valve stem frame 21 to rotate. The valve stem 31 is linked to the butterfly plate 34 through the eccentric frame 32 to form an eccentric structure, ensuring that the butterfly plate 34 quickly disengages or contacts with the valve body 1 when opening and closing, thereby controlling the medium input into the valve body to be discharged outward from the liquid outlet end 12; The flow regulating mechanism includes a ring frame 41 formed on the outer periphery of the partition 33, with a rotatable flap 42 built into the ring frame 41. A plurality of transmission holes 44 opened on the butterfly plate 34 are provided on the opposite side of the drainage groove 43; The driving mechanism includes a rod frame 51 symmetrically mounted on the partition 33 , a steering rod 52 passes through the interior of the rod frame 51 , the steering rod 52 is connected to the output end of the motor 53 , and a flap frame 54 connected to the flap 42 is sleeved on the outer wall.

[0019] It should be noted that the combined structure of the butterfly plate 34 and the partition plate 33 is connected to the eccentric frame 32, the butterfly plate 34 and the partition plate 33 are double-layered, and both rotate synchronously with the eccentric frame 32 and the valve stem 31. The butterfly plate 34 and the partition plate 33 are double-layered. The double-layer structure can enhance its supporting rigidity and prevent the butterfly plate 34 from deforming under high pressure. At the same time, the partition plate 33 can be used as an intermediate layer to expand the installation of the flow regulating mechanism. The eccentric frame 32 and the valve stem 31 are eccentrically sleeved. The axis of the valve stem 31 deviates from the center of the butterfly plate 34 to achieve asymmetric torque distribution and reduce the opening and closing torque.

[0020] In this embodiment, the ring frame 41 is fixed to the outer periphery of the partition 33. Flaps 42 that can rotate around the adjustment rod 52 are provided on both sides of the partition 33. The flaps 42 have a "fan-shaped" structure. When the flaps 42 are embedded in the clamping space between the partition 33 and the ring frame 41, the transmission through-holes 44 provided on the butterfly plate 34 are blocked by the flaps 42. By changing the overlapping area between the flaps 42 and the transmission through-holes 44 on the butterfly plate 34, flow rate step-by-step regulation is achieved. The motor 53 drives the flap 42 connected to the flap frame 54 to rotate through the adjustment rod 52. Its fan-shaped structure forms a dynamic covering relationship with the transmission through-holes 44 on the butterfly plate 34, achieving precise control of the angle of the flap 42: When the flap 42 is in the fully closed state, the flap 42 completely covers the transmission hole 44, blocking the medium from passing through; When the flap 42 is in a slightly open state, the flap 42 rotates a certain angle, and the drainage groove 43 is aligned with the partially exposed transmission through hole 44, forming a small flow cross section with a drainage amplitude, and transporting a small flow of the medium; When the flap 42 is in the fully open state: the flap 42 rotates to a vertical position relative to the butterfly plate 34, the transmission hole 44 is fully exposed, the groove direction of the drainage groove 43 is the same as the medium transmission direction, and the medium is accelerated through the transmission hole 44; When delivering a small flow rate, the butterfly plate 34 can be prevented from directly rubbing against the valve body 1 at a small opening, thereby causing damage to the sealing mechanism. Accurate flow regulation can be achieved through the cooperation between the transmission through hole 44 and the flap 42.

[0021] It can be understood that the flap 42 and the flap frame 54 rotate forward and reverse along the axis of the adjustment rod 52. When the flap 42 rotates forward, the transmission through hole 44 increases its exposure range during the forward rotation process. When the flap 42 flips over, the transmission through hole 44 is gradually covered and closed during the reversal process. A drainage groove 43 is spaced apart on the end face of the outer flap 42 facing the butterfly plate 34. The drainage groove 43 is intended to increase the medium transmission speed during small flow transmission.

[0022] As an example of the sealing structure of the valve body 1 itself: the inner cavity of the valve body 1 is provided with a raised sealing convex ring 61, the inner wall of the sealing convex ring 61 is a "slanted" structure, the sealing convex ring 61 is adapted to the sealing ring frame 62 provided on the outside of the butterfly plate 34, and the sealing ring frame 62 of the butterfly plate 34 slides along the inclined surface of the sealing convex ring 61, generating radial compression force through geometric interference to achieve metal hard sealing.

[0023] like Figure 2-7 As shown, the sealing mechanism includes a gas tank rack 71 arranged on one side of the butterfly plate 34, a gas tank 72 is clamped in the gas tank rack 71, and a charging and discharging end seat 73 is installed on the upper part of the gas tank 72. A tee pipe 74 is installed at one end of the charging and discharging end seat 73 that passes through the butterfly plate 34, and the two ends of the tee pipe 74 are respectively connected to a first air bag component 75 that penetrates the ring frame 41 and a second air bag component 76 that penetrates the sealing ring frame 62.

[0024] In one embodiment, by providing a first airbag component 75 and a second airbag component 76 that can be inflated and deformed; The first airbag member 75 is used to seal and compensate for the contact gap between the flap 42 and the ring frame 41; The second airbag member 76 is used for sealing compensation at the point where the butterfly plate 34 contacts the sealing convex ring 61 in the valve body 1; Double airbag seal compensation can adapt to different working requirements, reduce direct friction of seals and extend service life.

[0025] As an example of the working of the first airbag component 75, the ring frame 41 is a "ring" structure that is sleeved on the outer periphery of the partition 33. The first airbag component 75 clamped in the ring frame 41 is a deformable component, and its end surface facing the flap 42 is a deformable surface. When the partition 33 needs to be separated from the ring frame 41, the first airbag component 75 is first vented. The inflation and deflation end seat 73 transfers the gas in the first airbag component 75 to the gas tank 72 through the branch of the tee pipe 74. The deformable surface of the first airbag component 75 shrinks and separates from the edge of the flap 42 during the venting process. At this time, the flap 42 is flipped and separated from the ring frame 41, and small-batch transmission of the medium can be carried out. When the small-batch transmission needs to be terminated, the gas in the gas tank 72 is transferred to the first inner airbag component 75 through the branch of the tee pipe 74. The deformed surface of the first airbag component 75 collides with and covers the edge of the flap 42 during the inflation process. At this time, the gap between the flap 42 and the ring frame 41 is completely blocked to prevent leakage after the medium transmission is completed. As a working example of the second airbag component 76, the second airbag component 76 is clamped in the clamping groove opened in the sealing ring frame 62, and the end face of the second airbag component 76 close to the inner wall of the sealing convex ring 61 is a deformation surface. When the sealing ring frame 62 contacts the sealing convex ring 61 to separate the valve channel, the second airbag component 76 sucks in the gas in the gas tank 72 through the branch of the three-way pipe 74, and its deformation surface expands and diffuses toward the periphery, blocking the remaining gap between the sealing ring frame 62 and the sealing convex ring 61, thereby preventing leakage caused by the medium being transported through the gap.

[0026] It can be understood that solenoid valves are provided in the two branches of the tee pipe 74 toward the first airbag component 75 and the second airbag component 76, and the solenoid valves are used to control the opening and closing of the branches of the gas tank 72, the charging and discharging end seat 73 and the tee pipe 74; The solenoid valve of the tee pipe 74 branch automatically switches between charging and discharging according to the valve opening signal; When the butterfly plate 34 is fully closed, the second airbag member 76 is inflated and the main seal is effective; When the flap 42 finishes adjusting the flow rate, the first airbag member 75 is inflated and the auxiliary seal takes effect.

[0027] like Figure 8 As shown, the power supply mechanism includes a waterproof shell 81 arranged outside the motor 53, and the waterproof shell 81 has a built-in power supply terminal 83 connected to the motor 53. The power supply terminal 83 is connected to the external power supply through a cable sleeve 82 that passes through the valve stem 31.

[0028] In one embodiment, since the motor 53 is arranged inside the valve body 1, a sealed closed cavity is required for its power supply. A waterproof shell 81 with a sealing effect is provided on the outside of the motor 53. The cable is threaded through the cable sleeve 82 that passes through the valve stem 31. The motor 53 is continuously powered while maintaining the seal. The cable sleeve 82 passes through the upper part of the valve stem 31 and has no effect on the sealing of the valve body 1, thereby ensuring stable power supply to the motor 53.

[0029] It can be understood that the airbag sealing part of the sealing mechanism is electrically controlled by the solenoid valve in conjunction with the gas tank 72, and the same power supply method is used to provide power support. That is, a hole is opened at the butterfly plate 34 to provide an installation channel for the cable sleeve 82, and the cable is connected to the power supply terminal seat 83 to power the solenoid valve, effectively solving the power supply and sealing problems.

[0030] In an optional embodiment, a cable expansion cavity is reserved inside the valve stem 31 to compensate for the length of the cable sleeve 82 when it is pulled.

[0031] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. Eccentric butterfly valve with flow regulation function, characterized by: A valve body (1) for medium transmission is provided, wherein the transmission mechanism comprises a valve stem frame (21) mounted on the upper portion of the valve body (1), a transmission device (22) is mounted on the upper portion of the valve stem frame (21), and one end of the transmission device (22) is connected to a hand wheel (23); The butterfly plate mechanism comprises a valve stem (31) connected to the middle of the transmission device (22); an eccentric frame (32) is symmetrically sleeved on the outside of the valve stem (31); a partition (33) is connected to one side of the eccentric frame (32); and a butterfly plate (34) for closing the valve channel is connected to the partition (33); The flow regulating mechanism includes a ring frame (41) formed on the outer periphery of the partition (33), the ring frame (41) having a built-in rotatable flap (42), and a plurality of transmission through holes (44) opened on the butterfly plate (34) are provided on the opposite side of the drainage groove (43); The driving mechanism comprises a rod frame (51) symmetrically mounted on the partition (33), a direction-adjusting rod (52) passing through the interior of the rod frame (51), the direction-adjusting rod (52) being connected to the output end of the motor (53), and a flap frame (54) connected to the flap (42) being sleeved on the outer wall; The power supply mechanism comprises a waterproof housing (81) arranged outside the motor (53), wherein the waterproof housing (81) has a built-in power supply terminal (83) connected to the motor (53), and the power supply terminal (83) is connected to an external power source via a cable sleeve (82) passing through the valve stem (31).

2. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The two ends of the valve body (1) are respectively a liquid inlet end (11) and a liquid outlet end (12), and a flow regulating mechanism is arranged between the liquid inlet end (11) and the liquid outlet end (12).

3. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The combined structure of the butterfly plate (34) and the partition plate (33) is connected to the eccentric frame (32), the butterfly plate (34) and the partition plate (33) are double-layered, and both rotate synchronously with the eccentric frame (32) and the valve stem (31).

4. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The flap (42) is a "fan-shaped" structure. When the flap (42) is embedded in the clamping space between the partition (33) and the ring frame (41), the transmission through hole (44) opened on the butterfly plate (34) is blocked by the flap (42).

5. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The flap (42) and the flap frame (54) rotate forward and reverse along the axis of the direction-adjusting rod (52), and a drainage groove (43) is provided at intervals on the end surface of the flap (42) facing the butterfly plate (34).

6. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The inner cavity of the valve body (1) is provided with a raised sealing convex ring (61), the inner wall of the sealing convex ring (61) is an "inclined" structure, and the sealing convex ring (61) is adapted to a sealing ring frame (62) provided outside the butterfly plate (34).

7. The eccentric butterfly valve with flow regulation function according to claim 1, characterized in that: The sealing mechanism comprises a gas cylinder rack (71) arranged on one side of the butterfly plate (34), a gas cylinder (72) being clamped in the gas cylinder rack (71), a gas charging and discharging end seat (73) being installed on the upper part of the gas cylinder (72), a three-way pipe (74) being installed at one end of the gas charging and discharging end seat (73) penetrating the butterfly plate (34), and two ends of the three-way pipe (74) being respectively connected to a first air bag component (75) penetrating the ring frame (41) and a second air bag component (76) penetrating the sealing ring frame (62).

8. The eccentric butterfly valve with flow regulation function according to claim 7, characterized in that: The ring frame (41) is a "ring-shaped" structure sleeved on the outer periphery of the partition (33). The first airbag component (75) clamped in the ring frame (41) is a deformable component, and its end surface facing the flap (42) is a deformable surface.

9. The eccentric butterfly valve with flow regulation function according to claim 9, characterized in that: The second airbag component (76) is clamped in the clamping groove formed in the sealing ring frame (62), and the end surface of the second airbag component (76) close to the inner wall of the sealing convex ring (61) is a deformation surface.

10. The eccentric butterfly valve with flow regulation function according to claim 9, characterized in that: Solenoid valves are provided in the two branches of the three-way pipe (74) toward the first airbag component (75) and the second airbag component (76), and the solenoid valves are used to control the opening and closing of the branches of the gas tank (72), the gas charging and discharging end seat (73) and the three-way pipe (74).

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