A valve stem speed change device

Abstract

This invention relates to a valve stem speed-changing device, comprising a housing 10, an eccentric disc 20, an internal gear ring 30, an output shaft 40, and a drive shaft 50. The eccentric disc 20 rotates within the housing 10 and has an eccentric hole 21. The internal gear ring 30 rotates within the eccentric hole 21. The output shaft 40 has an output gear 41 that meshes with the internal teeth 31 of the internal gear ring. During the first rotational stroke of the drive shaft 50, the drive shaft 50 drives the internal gear ring 30 to rotate, and the internal gear ring 30 drives the output shaft 40 to rotate. During the second rotational stroke A2 of the drive shaft 50, the drive shaft 50 drives the eccentric disc 20 to rotate, and the output shaft 40 rotates synchronously with the drive shaft 50. This invention uses an eccentric disc and an offset internal gear ring, in conjunction with a locking / unlocking structure, to achieve segmented rotational operation. This increases the driving stroke of the valve stem, obtaining different driving speeds. Combined with a valve actuator, it allows the actuator to operate valves with a stroke greater than its own, improving operating efficiency and balancing the actuator's operating load.

Description

Technical Field

[0001] This invention relates to valve operating devices, and more particularly to a valve stem speed changing device. Background Technology

[0002] Currently, in valve operating devices, for ordinary ball valves (pivot ball valves, float ball valves, etc.), the valve opening and closing action can be completed by rotating the valve ball 90°. Therefore, the actuators equipped with ball valves are mostly designed with an operating stroke of 90°, forming a complete product system and widespread application. Common examples include manual worm gear boxes, pneumatic actuators with shift forks, rack and pinion pneumatic actuators, pneumatic-hydraulic actuators, integrated electric actuators, and split electric actuators with worm gear boxes; their structures and strokes are all matched to a 90° stroke. However, for some valves with an operating stroke greater than 90°, actuators with a 90° stroke cannot be matched, causing inconvenience in the connection between the valve and the actuator. For example, the forced-seal ball valves disclosed in Chinese invention patents "A Forced-Sealing Valve Operating Device" (application number 202011319032X) and "A DBB Forced-Sealing Ball Valve Drive Structure" (application number 202121752100 1) require the valve stem to rotate more than 90° during opening and closing. Similar situations exist with gate valves and globe valves, whose operating strokes often exceed 90°. Ordinary valve actuators require long operating times and have low efficiency when operating these types of valves. Furthermore, these valves with operating strokes exceeding 90° share a common characteristic: most of their operating stroke is unloaded (or lightly loaded), with only a small portion requiring a large operating load when the valve reaches the closed position. This leads to uneven power density in the actuator during operation. Chinese invention patent (application number 2024113044923) proposes a variable speed extended-stroke operating device that combines planetary gears with a locking device to achieve variable speed strokes for the valve stem, allowing for different transmission ratios suitable for the valve's opening and closing characteristics. However, besides the above-mentioned technical solutions, many other technical solutions can be employed to address these related technical problems. Summary of the Invention

[0003] The purpose of this invention is to propose a valve stem speed change device, providing more alternative technical solutions and improving the operation function of valve actuators.

[0004] To achieve the above objectives, the technical solution of the present invention is: a valve stem speed change device, comprising a housing (10), an eccentric disc (20), an internal gear ring (30), an output shaft (40), and a drive shaft (50). The eccentric disc (20) rotates within the housing (10), and the eccentric disc (20) is provided with an eccentric hole (21). The internal gear ring (30) rotates within the eccentric hole (21). The output shaft (40) is provided with an output gear (41), which meshes with the internal teeth (31) of the internal gear ring. The drive shaft (50) is provided with a drive arm (51). Arm (51) actuates the internal gear ring (30); during the first rotational stroke (A1) of the drive shaft (50), the eccentric disk (20) is locked inside the housing (10), the drive shaft (50) drives the internal gear ring (30) to rotate, and the internal gear ring (30) drives the output shaft (40) to rotate; during the second rotational stroke (A2) of the drive shaft (50), the internal gear ring (30) is locked inside the eccentric disk (20), the drive shaft (50) drives the eccentric disk (20) to rotate, and the output shaft (40) rotates synchronously with the drive shaft (50).

[0005] Furthermore, in order to drive and control the rotation of the eccentric disk, the eccentric disk (20) is provided with an unlocking block (60). Within the second rotation stroke (A2), the drive shaft (50) moves the unlocking block (60) to rotate in the first rotation direction (R1) in the R1 direction. The eccentric disk (20) is provided with a limiting block (24), and the outer shell (10) is provided with a locking block (12). Within the first rotation stroke (A1) of the drive shaft, the locking block (12) blocks the limiting block (24) from rotating in the second rotation direction (R2) in the R2 direction.

[0006] Furthermore, in order to control the rotation of the eccentric disk and the internal gear ring, the eccentric disk (20) is provided with a locking body (23). During the first rotational stroke (A1) of the drive shaft, the locking body (23) locks the eccentric disk (20) inside the housing (10); during the second rotational stroke (A2) of the drive shaft, the locking body (23) locks the internal gear ring (30) inside the eccentric disk (20), and the drive shaft (50) moves the internal gear ring (30) and drives the eccentric disk (20) to rotate in the second rotational direction (R2) in the R2 direction;

[0007] Furthermore, a preferred locking mechanism is that the eccentric disk (20) is provided with a locking body guide hole (22), the locking body (23) is provided in the locking body guide hole (22), the locking body (23) moves in the locking body guide hole (22), the inner wall of the outer shell (10) is provided with a locking groove (11), and the inner gear ring (30) is provided with an unlocking groove (32); when the eccentric disk (20) is locked in the outer shell (10), the locking body (23) disengages from the unlocking groove (32) and is embedded in the locking groove (11); when the inner gear ring (30) is locked in the eccentric disk (20), the locking body (23) disengages from the locking groove (11) and is embedded in the unlocking groove (32).

[0008] Furthermore, in order to lock the internal gear ring, the eccentric disk (20) is provided with an unlocking block (60). When the drive shaft (50) pushes the internal gear ring (30) to rotate in the first rotation direction (R1) along the R1 direction to the unlocking groove (32) corresponding to the locking groove (11), the drive arm (51) moves the unlocking block (60) to push the eccentric disk (20) to rotate. The eccentric disk (20) pushes the locking body (23) out of the locking groove (11) and into the unlocking groove (32), and the internal gear ring (30) is locked in the eccentric disk (20).

[0009] Furthermore, in order to lock the eccentric disk, the eccentric disk (20) is provided with a limiting block (24), and the outer shell (10) is provided with a locking block (12). When the eccentric disk (20) rotates along the second rotation direction (R2) in the R2 direction until the limiting block (24) touches the locking block (12), the locking body guide hole (22) rotates to the position corresponding to the locking groove (11), the eccentric disk (20) stops rotating, the drive shaft (50) pushes the internal gear ring (30) to rotate, and the internal gear ring (30) pushes the locking body (23) to disengage from the unlocking groove (32) and embed into the locking groove (11), and the eccentric disk (20) is locked inside the outer shell (10).

[0010] Furthermore, a structure for driving an internal gear ring with a drive arm is provided in which the drive arm (51) is provided with a paddle groove (52), the paddle groove (52) is an oblong groove, the internal gear ring (30) is provided with a paddle (53), the paddle (53) is disposed in the paddle groove (52), during the first rotation stroke (A1), the drive shaft (50) drives the internal gear ring (30) to rotate in the eccentric hole (21) through the paddle (53); during the second rotation stroke (A2), the drive shaft (50) drives the eccentric disk (20) to rotate in the second rotation direction (R2) in the R2 direction through the paddle (53).

[0011] Furthermore, in order to properly fit the lever block and the lever block slot, the lever block (53) is a strip block, and the lever block (53) is hinged to the internal gear ring (30).

[0012] Furthermore, in order to keep the eccentric disk at the end of the second rotation stroke, the eccentric disk (20) is provided with an unlocking block (60), the unlocking block (60) moves along the inner hole of the outer shell (10), the unlocking block (60) is provided with a self-locking groove (61), the self-locking groove (61) is a wedge-shaped groove, the self-locking groove is provided with a self-locking pin (62), the unlocking block (60) is provided with a self-locking spring (63) that pushes the self-locking pin (62) to the locked position, the unlocking block (60) is provided with an unlocking pin (64) that pushes the self-locking pin (62) to the unlocked position, when the self-locking pin (62) is in the locked position, the unlocking pin (64) protrudes out of the unlocking block (60).

[0013] Furthermore, the drive arm (51) is provided with a paddle groove (52), which is an oblong groove. The internal gear ring (30) is provided with a paddle (53), which is disposed in the paddle groove (52). An unlocking gap (S) is provided between the paddle groove (52) and the paddle (53) in the width direction. The drive arm (51) is provided with an unlocking top block (54) and a locking retaining groove (55). When the drive arm (51) contacts the unlocking block (60), The unlocking pin (64) corresponds to the locking retaining groove (55), and the self-locking pin (62) moves to the locked position; when the driving arm (51) pushes the unlocking block (60) to move, the self-locking pin (62) moves to the unlocked position; when the driving arm (51) moves the unlocking gap (S) in the direction of disengaging from the unlocking block (60), the unlocking top block (54) presses against the unlocking pin (64), and the unlocking pin (64) pushes the self-locking pin (62) to the unlocked position.

[0014] The beneficial effects of this invention are: by using an eccentric disc and an offset internal gear ring, in conjunction with a locking / unlocking structure, segmented rotation operation can be achieved, which can increase the driving stroke of the valve stem and obtain different driving speeds. When combined with a valve actuator, the actuator can operate valves with a stroke greater than its own, thereby improving operating efficiency and balancing the operating load of the actuator.

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the invention, omitting the top cover;

[0017] Figure 2 This is an exploded view of the structure of the present invention;

[0018] Figure 3 The plan view of the top cover is omitted in this invention;

[0019] Figure 4 yes Figure 3 AA cross-section view;

[0020] Figure 5 yes Figure 3 The enlarged view of part B is a diagram of the self-locking structure of the unlocking block 60;

[0021] Figure 6 This is a combined structural diagram of the outer shell, eccentric disk, internal gear ring and output shaft of the present invention, omitting the drive shaft and the top cover;

[0022] Figure 7 This is a schematic diagram showing the first rotational stroke A1 of the drive shaft from the beginning to the end position;

[0023] Figure 8 It is a schematic diagram of the eccentric disc pushing the locking body out of the locking groove and into the unlocking groove;

[0024] Figure 9 This is a schematic diagram showing the drive shaft rotating to the end position of the second rotation stroke A2;

[0025] Figure 10 This is a schematic diagram of the drive shaft rotating from the end position of the second rotation stroke A2 to the second rotation direction R2;

[0026] Figure 11 This is a schematic diagram showing the drive axis rotating in the second rotation direction R2 to the starting position of the second rotation stroke A2;

[0027] Figure 12 This is a schematic diagram showing the drive shaft rotating back to its initial position after the first rotation stroke A1, with the self-locking pin remaining in the locked position. Detailed Implementation

[0028] Example 1:

[0029] like Figures 1 to 12 A valve stem speed change device includes a housing 10, an eccentric disc 20, an internal gear ring 30, an output shaft 40, and a drive shaft 50.

[0030] The outer casing 10 is a circular recessed structure with an inner hole 16. The inner hole wall of the outer casing 10 has a locking groove 11, and the side wall of the outer casing has a locking stop groove 13. A locking stop 12 is installed in the locking stop groove 13, and the locking stop 12 protrudes from the inner hole wall of the outer casing. The bottom plate 14 of the outer casing has an output shaft hole 15, which is coaxial with the inner hole 16 of the outer casing.

[0031] The upper end of the housing is provided with a top cover 70, and the center of the top cover 70 is provided with a drive shaft hole 71. The drive shaft hole 71 is coaxial with the inner hole 16 of the housing (and also with the output shaft hole 15).

[0032] The outer diameter of the eccentric disk 20 corresponds to the inner hole 16 of the outer casing, and the bottom surface of the eccentric disk 20 contacts the bottom plate 14 of the outer casing. The eccentric disk 20 is installed in the inner hole 16 of the outer casing, and the eccentric disk 20 is rotatably engaged with the outer casing. The eccentric disk 20 is provided with an eccentric hole 21, the center of which is offset from the center of the eccentric disk. The eccentric disk 20 is provided with a locking body guide hole 22, which is a through hole between the outer diameter of the eccentric disk and the eccentric hole 21. A locking body 23, which is a sphere, is provided inside the locking body guide hole 22, and the locking body 23 moves within the locking body guide hole 22. The eccentric disk is provided with a limiting block 24, which protrudes from the upper end face of the eccentric disk 20. The eccentric disk is provided with an unlocking block mounting groove 25, which is recessed into the upper end surface of the eccentric disk 20. An unlocking block 60 is installed in the unlocking block mounting groove 25, and the unlocking block 60 protrudes from the upper end surface of the eccentric disk 20.

[0033] The internal gear ring 30 has internal teeth 31. It is a non-full-tooth gear ring; in this embodiment, it has 20 teeth out of a total of 40 teeth. The outer diameter of the internal gear ring corresponds to the eccentric hole 21 of the eccentric disk. The internal gear ring 20 is installed in the eccentric hole 21 of the eccentric disk 20, and the internal gear ring rotatably engages with the eccentric hole 21. The internal gear ring has a lever mounting hole 33, in which a lever pin 34 is installed, and a lever 53 is hinged to the lever pin 34. The outer diameter of the internal gear ring has an unlocking groove 32, which is a spherical groove corresponding to the locking body 23. In reality, the unlocking groove 32 is a spherical groove with a radius slightly larger than the radius of the locking body 23 and a depth smaller than the radius of the locking body.

[0034] The output shaft 40 is equipped with an output gear 41, which meshes with the internal teeth 31 of the internal gear ring. In this embodiment, the output shaft gear 41 has 20 teeth. The output shaft 40 is installed in the output shaft hole 15 on the bottom plate of the housing, and the output shaft 40 is rotatably engaged with the output shaft hole 15. At one end of the output gear 41, the output shaft is also provided with a drive shaft mounting hole 42.

[0035] The drive shaft 50 is installed in the drive shaft hole 71 of the upper cover. A drive shaft head 56 is located at the lower end of the drive shaft. Rotating the head 56 allows for rotatable mounting in the drive shaft mounting hole 42 of the output shaft, providing a stable shaft mounting structure for both the drive shaft and the output shaft. The drive shaft 50 has a drive arm 51 that rotates above the eccentric disc 20 and the internal gear ring 30. The drive arm 51 has a shifting block groove 52, which is an oblong groove. A shifting block 53 is disposed within the shifting block groove 52 and is an oblong-shaped shifting block that can slide within the shifting block groove 52. The drive arm 51 actuates the internal gear ring 30 via the shifting block 53.

[0036] To facilitate understanding of the valve stem speed change device of the present invention, this embodiment divides the rotation range of the drive shaft 50 into a first rotation stroke A1 and a second rotation stroke A2, and defines the rotation direction of the drive shaft 50 as a first rotation direction R1 and a second rotation direction R2. In the accompanying drawings, the first rotation direction R1 is a clockwise rotation direction, and the second rotation direction R2 is a counterclockwise rotation direction.

[0037] Within the first rotational stroke A1, the drive shaft 50 is in the initial position of the first rotational stroke A1 as follows: Figure 3 As shown, the positions of the eccentric disk 20 and the internal gear ring 30 are as follows: Figure 4 As shown, at this time, the locking body guide hole 22 corresponds to the locking groove 11 in the circumferential position, while the unlocking groove 32 is offset from the locking body guide hole 22 in the circumferential position. The locking body 23 in the locking body guide hole 22 is embedded in the locking groove 11 and disengaged from the unlocking groove 32. The locking body is limited by the internal gear ring 30 between the eccentric disk 20 and the outer shell 10. The eccentric disk 20 is locked in the outer shell 10 and cannot rotate. The drive shaft 50 rotates in the first rotation direction R1. The toggle slot 52 on the drive arm 51 moves the toggle block 53. The toggle block 53 drives the internal gear ring 30 to rotate in the eccentric hole 21 through the toggle pin 34. The internal gear ring drives the output shaft 40 to rotate through gear meshing. The drive shaft 50 pushes the internal gear ring 30 to rotate to the corresponding groove 11 of the unlocking groove 32 along the first rotation direction R1 (at this time, the unlocking groove 32 also corresponds to the locking body guide hole 22), and the drive arm 51 touches the unlocking block 60, as shown. Figure 7 As shown, the first rotational stroke A1 of the drive shaft ends at this point, and this position can be defined as the end position of the drive shaft in the first rotational stroke A1. During the first rotational stroke A1, the eccentric disk 20 and the housing 10 are fixed, and the drive shaft 50 drives the output shaft 40 to rotate in the same direction (first rotational direction R1). The transmission ratio between the output shaft 40 and the internal gear ring 30 is the number of teeth on the internal gear ring (40 teeth in total) : the number of teeth on the output shaft gear (20 teeth). Since the drive shaft and the internal gear ring do not rotate coaxially, as... Figure 7As shown, in this embodiment, when the rotational stroke of the drive shaft is the first rotational stroke A1 (from the dotted line position to the solid line position), the rotational stroke A3 of the internal gear ring 30 (with the rotational stroke of the unlocking slot 32 as a reference, from the dotted line position to the solid line position) is approximately 1.5 times the first rotational stroke A1. Therefore, it can be deduced that the transmission ratio between the output shaft 40 and the internal gear ring 30 is approximately 3:1. As a result, the rotational stroke of the output shaft increases by 3 times, and its overall rotational speed also increases by 3 times accordingly.

[0038] The end position of the first rotational stroke A1 of the drive shaft 50 is also the starting position of the second rotational stroke A2. As mentioned above, when the drive shaft 50 is at the end position of the first rotational stroke A1, the drive arm 51 contacts the unlocking block 60. When the drive shaft 50 continues to rotate along the first rotational direction R1 and enters the second rotational stroke A2, the drive arm 51 moves the unlocking block 60, pushing the eccentric disk 20 to rotate in the first rotational direction R1. Since the locking groove 11 is an arc-shaped groove with a depth less than the radius of the locking body, the eccentric disk 20 can push the locking body 23 out of the locking groove 11 and into the unlocking groove 32. The internal gear ring 30 is locked in the eccentric disk 20, and the eccentric disk 20 is released from the lock in the outer shell 10. The internal gear ring 30 and the eccentric disk 20 form a fixed structure that can rotate in the outer shell 10. Figure 8 As shown. Due to the gear meshing between the internal gear ring 30 and the output shaft 40, the drive shaft 50 is coaxial with the eccentric disk 20. The drive shaft drives the output shaft to rotate synchronously and in the same direction (first rotation direction R1) until it reaches the end position of the second rotation stroke A2, as shown. Figure 9 As shown.

[0039] When the drive shaft 50 rotates from the end position of the second rotation stroke A2 towards the second rotation direction R2, the locking body 23 locks the internal gear ring 30 within the eccentric disk 20. The shifting block slot 52 on the drive arm 51 actuates the shifting block 53, which in turn actuates the internal gear ring 30 via the shifting block pin 34. The internal gear ring rotates together with the eccentric disk 20, and the internal gear ring drives the output shaft 40 to rotate through gear meshing. The drive shaft 50, internal gear ring 30, eccentric disk 20, and output shaft 40 rotate synchronously and in the same direction (second rotation direction R2). Figure 10 As shown.

[0040] When the drive shaft 50 rotates in the second rotation direction R2 to the starting position of the second rotation stroke A2 (which is also the ending position of the first rotation stroke A1), the eccentric disk 20 rotates to the position corresponding to the locking groove 11 in the locking body guide hole 22. The eccentric disk 20 rotates to the position where the limiting block 24 touches the locking stop block 12. The locking stop block 12 blocks the limiting block 24 from rotating in the second rotation direction R2, and the eccentric disk 20 stops rotating. The drive shaft 50 continues to push the internal gear ring 30 to rotate in the second rotation direction R2. Since the unlocking groove 32 of the internal gear ring is a spherical groove with a depth less than the radius of the locking body, the internal gear ring 30 pushes the locking body 23 out of the unlocking groove 32 and into the locking groove 11. The eccentric disk 20 is then relocked inside the outer casing 10. Figure 11 As shown. Afterwards, the drive shaft 50 continues to rotate in the second rotation direction R2, entering the first rotation stroke A1. The shifter slot 52 on the drive arm 51 shifts the shifter 53. The shifter 53, through the shifter pin 34, drives the internal gear ring 30 to rotate within the eccentric hole 21. The internal gear ring, through gear meshing, drives the output shaft 40 to rotate in the second rotation direction R2 until it returns to the initial position of the first rotation stroke A1, as shown. Figure 12 As shown. Similarly, with the increase in the rotational stroke of the output shaft 40, its overall rotational speed also increases accordingly.

[0041] Taking valve operation as an example, the initial position of the first rotation stroke A1 (e.g.) Figure 3 (As shown) is the open position of the valve stem, and the end position of the second rotation stroke A2 (as shown) Figure 9 (As shown) is the closed position of the valve stem (i.e., the closed position of the valve); the first rotation direction R1 is the rotation direction of the drive shaft when the valve is closed, and the second rotation direction R2 is the rotation direction of the drive shaft when the valve is opened.

[0042] The valve stem speed-changing device of the present invention has a drive shaft in a first rotational stroke A1. The output shaft has a greater rotational stroke than the drive shaft, and the smaller rotation angle of the drive shaft results in a larger rotation angle for the output shaft, achieving a stroke extension effect of the drive mechanism and expanding the applicability of the valve actuator. It also increases the drive speed, improving the operating efficiency of the valve and ensuring a more even operating load on the actuator. Furthermore, the present invention is suitable for low-torque, long-stroke operation during the initial stage of valve closing and the later stage of valve opening. In the second rotational stroke A2, the drive shaft rotates synchronously with the output shaft, suitable for high-torque, short-stroke operation during the later stage of valve closing and the initial stage of valve opening.

[0043] Example 2:

[0044] A valve stem speed change device, this embodiment is an improvement of embodiment one.

[0045] In Embodiment 1, the end position of the second rotation stroke A2 typically corresponds to the closed state of the valve. However, Embodiment 1 does not include a self-locking device. If the valve itself or the actuator does not have a self-locking function, it cannot be guaranteed that the valve stem speed change device will stably remain at the end position of the second rotation stroke A2, which may lead to loosening and thus prevent the valve from reliably remaining in the closed state.

[0046] To address this technical problem, the unlocking block 60 in this embodiment has been equipped with a self-locking function.

[0047] As in Embodiment 1, the eccentric disk 20 is provided with an unlocking block 60, which moves along the inner hole of the outer casing 10.

[0048] In this embodiment, as Figure 5 As shown, the unlocking block 60 has a self-locking groove 61, and a self-locking pin 62 is provided in the self-locking groove. The self-locking pin is located between the unlocking block 60 and the inner hole 16 of the outer shell. The self-locking groove 61 is a wedge-shaped groove with a wedge angle α. The end of the self-locking groove in the first rotation direction R1 is smaller than the end in the second rotation direction R2. When the self-locking pin 62 is close to the end of the self-locking groove in the second rotation direction R2, it can be said that the self-locking pin is in the unlocked position, and the self-locking pin 62 is in a loose state, allowing the unlocking block 60 to move along the inner hole 16 of the outer shell. When the self-locking pin 62 is close to the end of the self-locking groove in the first rotation direction R1, the self-locking pin 62 is wedged between the unlocking block 60 and the inner hole 16 of the outer shell, which can be said that the self-locking pin is in the locked position, preventing the unlocking block 60 from moving along the inner hole 16 of the outer shell in the second rotation direction R2. The unlocking block 60 is provided with a self-locking spring 63 that pushes the self-locking pin 62 to the locked position. This constitutes the function of an overrunning clutch, allowing the unlocking block 60 to rotate freely in the first rotation direction R1 but not in the second rotation direction R2; that is, the eccentric disc can rotate freely in the first rotation direction R1 but not in the second rotation direction R2.

[0049] In order to control the self-locking pin and enable the unlocking block 60 to rotate controllably in the second rotation direction R2, in this embodiment, the unlocking block 60 is provided with an unlocking pin 64 that pushes the self-locking pin 62 to move in the unlocking direction. The front end of the unlocking pin 64 is a cone, which forms an inclined surface contact with the self-locking pin 62. When the self-locking pin 62 is in the locked position, it presses against the conical surface of the unlocking pin 64, causing the unlocking pin 64 to protrude out of the unlocking block 60. The unlocking pin 64, through its conical shape, presses against the self-locking pin 62, causing the self-locking pin to move to the unlocking position.

[0050] As described in Embodiment 1, the drive arm 51 is provided with a lever groove 52, which is an oblong groove. The internal gear ring 30 is provided with a lever 53, which is disposed within the lever groove 52. In order to control the unlocking of the self-locking pin, in this embodiment, as... Figure 3As shown, there is an unlocking gap S in the width direction between the toggle slot 52 and the toggle block 53. The drive arm 51 is provided with an unlocking top block 54 and a locking retaining groove 55. When the drive arm 51 contacts the unlocking block 60, the unlocking pin 64 corresponds to the locking retaining groove 55 and can protrude from the unlocking block 60. The self-locking pin 62 can move to the locked position, so that the drive arm 51 can push the eccentric disk 20 to move in the first rotation direction R1, but the eccentric disk 20 cannot move in the second rotation direction R2.

[0051] Because the unlocking block 60 has an added self-locking function, when the valve is closed, i.e., when the drive shaft 50 is stationary at the end of the second rotation stroke A2, as... Figure 9 As shown, the unlocking block 60 cannot rotate in the second rotation direction R2 (i.e., the valve opening operation direction), so that the eccentric disc 20, the internal gear ring 30 and the output shaft 40 can all remain stationary, and the valve can be stably kept closed.

[0052] When the valve is opened, the drive shaft 50 rotates in the second rotation direction R2, and the drive arm 51 moves the unlocking distance S in the direction of disengaging from the unlocking block 60. The unlocking top block 54 presses against the unlocking pin 64 protruding from the unlocking block 60. The unlocking pin 64 pushes the self-locking pin 62 to the unlocking position through the conical surface, allowing the eccentric disc to move in the second rotation direction R2. Figure 10 As shown. Then, the drive arm 50 moves the lever 53, causing the internal gear ring, eccentric disc, and output shaft to rotate in the second rotation direction R2 to the starting position of the second rotation stroke A2, as shown. Figure 11 As shown. During this process, the unlocking top block 54 holds the unlocking pin 64 pressed against it, keeping the self-locking pin 62 in the unlocked position. Afterwards, the drive shaft 50 continues to rotate in the second rotation direction R2, and the unlocking top block 54 of the drive arm 51 completely disengages from the unlocking block 60. The self-locking spring 63 pushes the self-locking pin 62, which remains in the locked position, as shown. Figure 12 As shown.

[0053] The technical solution of this embodiment can effectively prevent the valve stem speed change device from becoming loose in the closed state of the valve, so that the valve can reliably remain in the closed state.

Claims

1. A valve stem speed change device, characterized in that, The device includes a housing (10), an eccentric disk (20), an internal gear ring (30), an output shaft (40), and a drive shaft (50). The eccentric disk (20) rotates within the housing (10) and has an eccentric hole (21). The internal gear ring (30) rotates within the eccentric hole (21). The output shaft (40) has an output gear (41) that meshes with the internal teeth (31) of the internal gear ring. The drive shaft (50) has a drive arm (51) that actuates the internal gear ring (30). 0); During the first rotational stroke (A1) of the drive shaft (50), the eccentric disk (20) is locked inside the housing (10), the drive shaft (50) drives the internal gear ring (30) to rotate, and the internal gear ring (30) drives the output shaft (40) to rotate; During the second rotational stroke (A2) of the drive shaft (50), the internal gear ring (30) is locked inside the eccentric disk (20), the drive shaft (50) drives the eccentric disk (20) to rotate, and the output shaft (40) rotates synchronously with the drive shaft (50).

2. The valve stem speed change device according to claim 1, characterized in that, The eccentric disk (20) is provided with an unlocking block (60). During the second rotation stroke (A2), the drive shaft (50) moves the unlocking block (60) to rotate in the first rotation direction (R1). The eccentric disk (20) is provided with a limiting block (24), and the outer shell (10) is provided with a locking block (12). During the first rotation stroke (A1) of the drive shaft, the locking block (12) blocks the limiting block (24) from rotating in the second rotation direction (R2).

3. The valve stem speed change device according to claim 1, characterized in that, The eccentric disk (20) is provided with a locking body (23). During the first rotational stroke (A1) of the drive shaft, the locking body (23) locks the eccentric disk (20) inside the housing (10). During the second rotational stroke (A2) of the drive shaft, the locking body (23) locks the internal gear ring (30) inside the eccentric disk (20). The drive shaft (50) moves the internal gear ring (30) and drives the eccentric disk (20) to rotate in the second rotational direction (R2).

4. The valve stem speed change device according to claim 3, characterized in that, The eccentric disk (20) is provided with a locking body guide hole (22), and the locking body (23) is provided in the locking body guide hole (22). The locking body (23) moves in the locking body guide hole (22). The inner wall of the outer shell (10) is provided with a locking groove (11), and the inner gear ring (30) is provided with an unlocking groove (32). When the eccentric disk (20) is locked in the outer shell (10), the locking body (23) disengages from the unlocking groove (32) and is embedded in the locking groove (11). When the inner gear ring (30) is locked in the eccentric disk (20), the locking body (23) disengages from the locking groove (11) and is embedded in the unlocking groove (32).

5. The valve stem speed change device according to claim 4, characterized in that, The eccentric disk (20) is provided with an unlocking block (60). When the drive shaft (50) pushes the internal gear ring (30) to rotate to the unlocking groove (32) corresponding to the locking groove (11) along the first rotation direction (R1), the drive arm (51) moves the unlocking block (60) to push the eccentric disk (20) to rotate. The eccentric disk (20) pushes the locking body (23) out of the locking groove (11) and into the unlocking groove (32). The internal gear ring (30) is locked in the eccentric disk (20).

6. The valve stem speed change device according to claim 4, characterized in that, The eccentric disk (20) is provided with a limiting block (24), and the outer shell (10) is provided with a locking block (12). When the eccentric disk (20) rotates along the second rotation direction (R2) to the point where the limiting block (24) touches the locking block (12), the locking body guide hole (22) rotates to the position corresponding to the locking groove (11), the eccentric disk (20) stops rotating, the drive shaft (50) pushes the internal gear ring (30) to rotate, and the internal gear ring (30) pushes the locking body (23) to disengage from the unlocking groove (32) and embed into the locking groove (11), and the eccentric disk (20) is locked inside the outer shell (10).

7. The valve stem speed change device according to claim 1, characterized in that, The drive arm (51) is provided with a shifting block groove (52), which is an oblong groove. The internal gear ring (30) is provided with a shifting block (53), which is disposed in the shifting block groove (52). During the first rotation stroke (A1), the drive shaft (50) drives the internal gear ring (30) to rotate in the eccentric hole (21) through the shifting block (53). During the second rotation stroke (A2), the drive shaft (50) drives the eccentric disk (20) to rotate in the second rotation direction (R2) through the shifting block (53).

8. The valve stem speed change device according to claim 7, characterized in that, The lever (53) is a strip-shaped block, and the lever (53) is hinged to the internal gear ring (30).

9. The valve stem speed change device according to claim 1, characterized in that, The eccentric disk (20) is provided with an unlocking block (60), which moves along the inner hole of the outer shell (10). The unlocking block (60) is provided with a self-locking groove (61), which is a wedge-shaped groove. The self-locking groove is provided with a self-locking pin (62). The unlocking block (60) is provided with a self-locking spring (63) that pushes the self-locking pin (62) to the locked position. The unlocking block (60) is provided with an unlocking pin (64) that pushes the self-locking pin (62) to the unlocked position. When the self-locking pin (62) is in the locked position, the unlocking pin (64) protrudes from the unlocking block (60).

10. The valve stem speed change device according to claim 9, characterized in that, The drive arm (51) is provided with a lever groove (52), which is an oblong groove. The internal gear ring (30) is provided with a lever (53), which is disposed in the lever groove (52). There is an unlocking gap (S) between the lever groove (52) and the lever (53) in the width direction. The drive arm (51) is provided with an unlocking top block (54) and a locking retaining groove (55). When the drive arm (51) contacts the unlocking block (60), the unlocking... The locking pin (64) corresponds to the locking retaining groove (55), and the self-locking pin (62) moves to the locking position; when the driving arm (51) pushes the unlocking block (60) to move, the self-locking pin (62) moves to the unlocking position; when the driving arm (51) moves the unlocking gap (S) in the direction of disengaging from the unlocking block (60), the unlocking top block (54) presses against the unlocking pin (64), and the unlocking pin (64) pushes the self-locking pin (62) to the unlocking position.

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