Valve rod speed change device

Abstract

The invention relates to a valve rod speed changing device which comprises a shell 10, an eccentric disc 20, an inner gear ring 30, an output shaft 40 and a driving shaft 50, the eccentric disc 20 rotates in the shell 10, the eccentric disc 20 is provided with an eccentric hole 21, the inner gear ring 30 rotates in the eccentric hole 21, the output shaft 40 is provided with an output gear 41, and the output gear 41 is meshed with inner teeth 31 of the inner gear ring; within the first rotating stroke of the driving shaft 50, the driving shaft 50 drives the inner gear ring 30 to rotate, and the inner gear ring 30 drives the output shaft 40 to rotate; and in the second rotating stroke A2 of the driving shaft 50, the driving shaft 50 drives the eccentric disc 20 to rotate, and the output shaft 40 and the driving shaft 50 synchronously rotate. The eccentric disc and the biased inner gear ring are adopted to be matched with a locking / unlocking structure, segmented rotating operation is achieved, the driving stroke of the valve rod can be increased, different driving speeds are obtained, the eccentric disc and the biased inner gear ring are combined with a valve actuator, the actuator can operate a valve with the stroke larger than the stroke of the actuator, the operation efficiency is improved, and the operation load of the actuator is balanced.

Description

Technical Field

[0001] The invention relates to a valve operating device, in particular to a valve stem speed changing device. Background Art

[0002] At present, in the valve operating device, for ordinary ball valves (pivot ball valves, floating ball valves, etc.), the valve ball can rotate 90° to complete the valve switching action, so the actuator equipped with the ball valve is designed to operate with a stroke of 90°, which has formed a complete product system and wide application. For example, the common manual worm gear box, scotch fork pneumatic actuator, gear rack pneumatic actuator, gas-liquid linkage actuator, integrated electric actuator, split electric head + worm gear box, their structures and motion strokes are matched for 90° stroke. However, for some valves with an operating stroke greater than 90°, it is impossible to match an actuator with a 90° stroke, which brings inconvenience to the connection between the valve and the actuator. For example, the forced sealing ball valve disclosed in the Chinese invention patent "A forced sealing valve operating device" (application number 202011319032X) and "A DBB forced sealing ball valve drive structure" (application number 202121752100 1) requires the valve stem to rotate more than 90° during the opening and closing process. Similar situations include gate valves and stop valves, whose operating strokes are often greater than 90°. Ordinary valve actuators require a long working time and have low working efficiency when operating such valves. In addition, a common feature of such valves with an operating stroke greater than 90° is that most of the operating stroke of the valve belongs to the no-load stroke (or light-load stroke), and only a small operating stroke when the valve reaches the closed position will require a larger operating load, which also leads to uneven power density of the actuator during operation. The Chinese invention patent (application number 2024113044923) proposes a technical solution for a variable speed and extended range operating device, which combines planetary gears with locking devices to realize the variable speed and extended range function of the valve stem, and can obtain different transmission ratios, which are suitable for the opening and closing operating characteristics of the valve. However, in addition to the above technical solutions, more technical solutions can still be used to solve related technical problems. Summary of the invention

[0003] The purpose of the present invention is to propose a valve stem speed changing device, provide more optional technical solutions, and improve the operating function of the valve actuator.

[0004] In order to achieve the above-mentioned object, the technical solution of the present invention is: a valve stem speed change device, comprising a housing (10), an eccentric disk (20), an inner gear ring (30), an output shaft (40) and a drive shaft (50), wherein the eccentric disk (20) rotates in the housing (10), the eccentric disk (20) is provided with an eccentric hole (21), the inner gear ring (30) rotates in the eccentric hole (21), the output shaft (40) is provided with an output gear (41), the output gear (41) is meshed with the inner teeth (31) of the inner gear ring, the drive shaft (50) is provided with a drive arm (51), and the drive The arm (51) moves the inner gear ring (30); within a first rotation stroke (A1) of the drive shaft (50), the eccentric disk (20) is locked in the housing (10), the drive shaft (50) drives the inner gear ring (30) to rotate, and the inner gear ring (30) drives the output shaft (40) to rotate; within a second rotation stroke (A2) of the drive shaft (50), the inner gear ring (30) is locked in 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), and within the second rotation stroke (A2), the drive shaft (50) drives the unlocking block (60) to rotate in the first rotation direction (R1) of the R1 direction; the eccentric disk (20) is provided with a limit block (24), and the housing (10) is provided with a locking block (12), and within the first rotation stroke (A1) of the drive shaft, the locking block (12) blocks the limit block (24) from rotating in the second rotation direction (R2) of the R2 direction.

[0006] Furthermore, in order to control the rotation of the eccentric disk and the inner gear ring, the eccentric disk (20) is provided with a locking body (23); within a first rotation stroke (A1) of the drive shaft, the locking body (23) locks the eccentric disk (20) within the housing (10); within a second rotation stroke (A2) of the drive shaft, the locking body (23) locks the inner gear ring (30) within the eccentric disk (20); the drive shaft (50) moves the inner gear ring (30) and drives the eccentric disk (20) to rotate in a second rotation direction (R2) of direction R2; 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 hole 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) escapes from the unlocking groove (32) and embeds into the locking groove (11); when the inner gear ring (30) is locked in the eccentric disk (20), the locking body (23) escapes from the locking groove (11) and embeds into the unlocking groove (32).

[0007] Furthermore, in order to achieve locking of the inner gear ring, the eccentric disk (20) is provided with an unlocking block (60), and when the drive shaft (50) pushes the inner gear ring (30) to rotate along the first rotation direction (R1) in the R1 direction until the unlocking groove (32) corresponds to the locking groove (11), the drive arm (51) moves the unlocking block (60) to push the eccentric disk (20) to rotate, and the eccentric disk (20) pushes the locking body (23) to escape from the locking groove (11) and embed into the unlocking groove (32), and the inner gear ring (30) is locked in the eccentric disk (20).

[0008] Furthermore, in order to achieve locking of the eccentric disk, the eccentric disk (20) is provided with a limit block (24), and the housing (10) is provided with a locking block (12). When the eccentric disk (20) rotates in a second rotation direction (R2) in the R2 direction until the limit block (24) contacts the locking block (12), the locking body guide hole (22) rotates to a position corresponding to the locking groove (11), the eccentric disk (20) stops rotating, the drive shaft (50) pushes the inner gear ring (30) to rotate, and the inner gear ring (30) pushes the locking body (23) to escape from the unlocking groove (32) and embed into the locking groove (11), and the eccentric disk (20) is locked in the housing (10).

[0009] Furthermore, a structure in which a driving arm drives an inner gear ring is provided, wherein the driving arm (51) is provided with a shift block groove (52), the shift block groove (52) is a waist-shaped groove, the inner gear ring (30) is provided with a shift block (53), the shift block (53) is arranged in the shift block groove (52), within the first rotation stroke (A1), the driving shaft (50) drives the inner gear ring (30) to rotate in the eccentric hole (21) through the shift block (53); within the second rotation stroke (A2), the driving shaft (50) drives the eccentric disk (20) to rotate in a second rotation direction (R2) in the R2 direction through the shift block (53).

[0010] Furthermore, in order to ensure that the shift block and the shift block groove are properly matched, the shift block (53) is a bar-shaped block, and the shift block (53) is hinged to the inner gear ring (30).

[0011] Furthermore, in order to keep the eccentric disk at the end position 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 housing (10), a self-locking groove (61) is provided in the unlocking block (60), the self-locking groove (61) is a wedge-shaped groove, a self-locking pin (62) is provided in the self-locking groove, the unlocking block (60) is provided with a self-locking spring (63) for pushing the self-locking pin (62) to move toward the locking position, the unlocking block (60) is provided with an unlocking pin (64) for pushing the self-locking pin (62) to move toward the unlocking position, and when the self-locking pin (62) is in the locking position, the unlocking pin (64) protrudes out of the unlocking block (60).

[0012] Furthermore, the driving arm (51) is provided with a shift block groove (52), the shift block groove (52) is a waist-shaped groove, the inner gear ring (30) is provided with a shift block (53), the shift block (53) is arranged in the shift block groove (52), an unlocking spacing (S) is provided between the shift block groove (52) and the shift block (53) in the width direction, and the driving arm (51) is provided with an unlocking top block (54) and a locking holding groove (55); when the driving 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 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 distance (S) in a direction away from the unlocking block (60), the unlocking push block (54) pushes the unlocking pin (64), and the unlocking pin (64) pushes the self-locking pin (62) to move to the unlocking position.

[0013] The beneficial effects of the present invention are: an eccentric disk and an offset inner gear ring are used in conjunction with a locking / unlocking structure to achieve segmented rotation operation, 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 a valve that is larger than its own stroke, improve operating efficiency, and balance the operating load of the actuator.

[0014] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present invention, omitting the upper cover; Figure 2 It is a structural exploded view of the present invention; Figure 3It is a plan view of the present invention omitting the upper cover; Figure 4 yes Figure 3 AA section view; Figure 5 yes Figure 3 The partial enlarged view B is a self-locking structure diagram of the unlocking block 60; Figure 6 It is a combined structural diagram of the housing, eccentric disc, inner gear ring and output shaft of the present invention, omitting the drive shaft and upper cover; Figure 7 is a schematic diagram of the starting position to the ending position of the first rotation stroke A1 of the driving shaft; Figure 8 It is a schematic diagram of the eccentric disk pushing the locking body out of the locking groove and into the unlocking groove; Fig. 9 is a schematic diagram of the driving shaft rotating to the end position of the second rotation stroke A2; Fig.10 is a schematic diagram of the driving shaft rotating from the end position of the second rotation stroke A2 toward the second rotation direction R2; Fig.11 is a schematic diagram of the driving shaft rotating in the second rotation direction R2 to the starting position of the second rotation stroke A2; Fig.12 It is a schematic diagram showing that the driving shaft rotates back to the initial position of the first rotation stroke A1, and the self-locking pin remains in the locked position. DETAILED DESCRIPTION

[0016] Embodiment 1: like Figures 1 to 12 A valve stem speed change device includes a housing 10, an eccentric disk 20, an inner gear ring 30, an output shaft 40 and a drive shaft 50.

[0017] The housing 10 is a circular groove structure with an inner hole 16. The inner hole wall of the housing 10 is provided with a locking groove 11, and the side wall of the housing is provided with a locking block groove 13. A locking block 12 is installed in the locking block groove 13, and the locking block 12 protrudes from the inner hole wall of the housing. The bottom plate 14 of the housing is provided with an output shaft hole 15, and the output shaft hole 15 is coaxial with the inner hole 16 of the housing.

[0018] An upper cover 70 is provided at the upper end of the housing, and a drive shaft hole 71 is provided at the center of the upper cover 70. The drive shaft hole 71 is coaxial with the inner hole 16 of the housing (also coaxial with the output shaft hole 15).

[0019] The outer diameter of the eccentric disk 20 corresponds to the inner hole 16 of the housing, and the bottom surface of the eccentric disk 20 contacts the bottom plate 14 of the housing. The eccentric disk 20 is installed in the inner hole 16 of the housing, and the eccentric disk 20 and the housing are rotatably matched. The eccentric disk 20 is provided with an eccentric hole 21, and the center of the eccentric hole 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 is provided in the locking body guide hole 22, and the locking body 23 is a sphere, and the locking body 23 moves in the locking body guide hole 22. The eccentric disk is provided with a limit block 24, and the limit block 24 protrudes from the upper end surface of the eccentric disk 20. The eccentric disk is provided with an unlocking block installation 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 installation groove 25 , and the unlocking block 60 protrudes from the upper end surface of the eccentric disk 20 .

[0020] The inner gear ring 30 is provided with inner teeth 31. The inner gear ring is a non-full-tooth gear ring. In this embodiment, the inner gear ring is an inner gear ring with 40 full teeth and 20 teeth. The outer diameter of the inner gear ring corresponds to the eccentric hole 21 of the eccentric disk. The inner gear ring 20 is installed in the eccentric hole 21 of the eccentric disk 20, and the inner gear ring and the eccentric hole 21 are rotatably matched. The inner gear ring is provided with a shift block mounting hole 33, in which a shift block pin 34 is installed, and a shift block 53 is hingedly installed on the shift block pin 34. The inner gear ring 30 is provided with an unlocking groove 32 on the outer diameter of the inner gear ring. The unlocking groove 32 is a spherical groove corresponding to the locking body 23. In fact, 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.

[0021] The output shaft 40 is provided with an output gear 41, which meshes with the inner teeth 31 of the inner gear ring. In this embodiment, the number of teeth of the output shaft gear 41 is 20. 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 matched 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.

[0022] The drive shaft 50 is installed in the drive shaft hole 71 of the upper cover. A drive shaft head 56 is provided at the lower end of the drive shaft. The rotating shaft head 56 is installed in the drive shaft installation hole 42 of the output shaft to rotate and cooperate, so that the drive shaft and the output shaft obtain a stable shaft installation structure. The drive shaft 50 is provided with a drive arm 51. The drive arm 51 rotates above the eccentric disk 20 and the inner gear ring 30. The drive arm 51 is provided with a shifting block groove 52. The shifting block groove 52 is a waist-shaped groove. The shifting block 53 is arranged in the shifting block groove 52. The shifting block 53 is a shifting block with a waist-shaped structure. The shifting block 53 can slide in the shifting block groove 52. The drive arm 51 shifts the inner gear ring 30 through the shifting block 53.

[0023] In order to facilitate the understanding of the rod speed change device of the valve 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.

[0024] In the first rotation stroke A1, the driving shaft 50 is at an initial position of the first rotation stroke A1. Figure 3 As shown, the positions of the eccentric disk 20 and the inner gear ring 30 are as shown in FIG. Figure 4 As shown, at this time, the locking body guide hole 22 corresponds to the locking groove 11 in the circumferential position, and 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 escapes from the unlocking groove 32. The locking body is confined between the eccentric disk 20 and the outer shell 10 by the inner gear ring 30. The eccentric disk 20 is locked in the outer shell 10 and the eccentric disk 20 cannot rotate. The driving shaft 50 rotates in the first rotation direction R1, and the shifting block groove 52 on the driving arm 51 shifts the shifting block 53. The shifting block 53 drives the inner gear ring 30 to rotate in the eccentric hole 21 through the shifting block pin 34. The inner gear ring drives the output shaft 40 to rotate through gear meshing. The driving shaft 50 pushes the inner gear ring 30 to rotate along the first rotation direction R1 to the predetermined groove 11 corresponding to the unlocking groove 32 (at this time, the unlocking groove 32 also corresponds to the locking body guide hole 22), and the driving arm 51 touches the unlocking block 60, as shown in FIG. Figure 7 As shown, at this time, the first rotation stroke A1 of the drive shaft ends, and the drive shaft at this position can be defined as the end position of the drive shaft in the first rotation stroke A1. In the first rotation stroke A1, the eccentric disk 20 and the housing 10 are in a fixed state, and the drive shaft 50 drives the output shaft 40 to rotate in the same direction (first rotation direction R1). The transmission ratio of the output shaft 40 and the inner gear ring 30 is the number of teeth of the inner gear ring (40 teeth in total): the number of teeth of the gear of the output shaft (20 teeth). Since the drive shaft and the inner gear ring do not rotate coaxially, as shown in FIG. Figure 7 As shown, in this embodiment, when the rotation stroke of the drive shaft is the first rotation stroke A1 (rotating from the dotted line position to the solid line position), the rotation stroke A3 of the inner gear ring 30 (taking the rotation stroke of the unlocking groove 32 as a reference, rotating from the dotted line position to the solid line position) is about 1.5 times the first rotation stroke A1. It can be inferred that the transmission ratio of the output shaft 40 to the inner gear ring 30 is about 3:1. As a result, the rotation stroke of the output shaft increases by 3 times, and its overall rotation speed also increases by 3 times accordingly.

[0025] The end position of the first rotation stroke A1 of the driving shaft 50 is also the starting position of the second rotation stroke A2. As mentioned above, when the driving shaft 50 is at the end position of the first rotation stroke A1, the driving arm 51 touches the unlocking block 60. When the driving shaft 50 continues to rotate along the first rotation direction R1 and enters the second rotation stroke A2, the driving arm 51 moves the unlocking block 60 to push the eccentric disk 20 to rotate in the first rotation 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 embed into the unlocking groove 32. The inner gear ring 30 is locked in the eccentric disk 20, and the eccentric disk 20 is unlocked in the outer shell 10. The inner gear ring 30 and the eccentric disk 20 constitute a fixed structure that can rotate in the outer shell 10. Figure 8 As shown. Since the gears between the inner gear ring 30 and the output shaft 40 are meshed, the drive shaft 50 is coaxial with the eccentric disk 20, and the drive shaft drives the output shaft to rotate synchronously and in the same direction (first rotation direction R1) until it rotates to the end position of the second rotation stroke A2, as shown. Fig. 9 shown.

[0026] When the driving shaft 50 rotates from the end position of the second rotation stroke A2 to the second rotation direction R2, since the locking body 23 locks the inner gear ring 30 in the eccentric disk 20, the shifting block groove 52 on the driving arm 51 shifts the shifting block 53, and the shifting block 53 shifts the inner gear ring 30 through the shifting block pin 34, and the inner gear ring rotates together with the eccentric disk 20, and the inner gear ring drives the output shaft 40 to rotate through the gear meshing, and the driving shaft 50, the inner gear ring 30, the eccentric disk 20 and the output shaft 40 rotate synchronously in the same direction (the second rotation direction R2), as shown in FIG. Fig.10 shown.

[0027] 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 end position of the first rotation stroke A1), the eccentric disk 20 rotates to the position where the locking body guide hole 22 corresponds to the locking groove 11, and the eccentric disk 20 rotates to the position where the limit block 24 touches the locking block 12. The locking block 12 blocks the limit 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 inner gear ring 30 to rotate in the second rotation direction R2. Since the unlocking groove 32 of the inner gear ring is a spherical groove with a depth less than the radius of the locking body, the inner gear ring 30 pushes the locking body 23 out of the unlocking groove 32 and embeds into the locking groove 11, and the eccentric disk 20 is re-locked in the housing 10. Fig.11 After that, the driving shaft 50 continues to rotate in the second rotation direction R2 and enters the first rotation stroke A1. The shifting block groove 52 on the driving arm 51 shifts the shifting block 53. The shifting block 53 drives the inner gear ring 30 to rotate in the eccentric hole 21 through the shifting block pin 34. The inner gear ring drives the output shaft 40 to rotate in the second rotation direction R2 through gear meshing until it rotates back to the initial position of the first rotation stroke A1. Fig.12 Likewise, the rotational stroke of the output shaft 40 increases, and its overall rotational speed also increases accordingly.

[0028] Taking the operation of the valve as an example, the initial position of the first rotation stroke A1 (such as Figure 3 ) is the opening position of the valve stem, and the end position of the second rotation stroke A2 (as shown Fig. 9 ) 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.

[0029] In the valve stem speed change device of the present invention, the driving shaft is in the first rotation stroke A1, and the rotation stroke of the output shaft is greater than the rotation stroke of the driving shaft. The driving shaft rotates a smaller angle so that the output shaft obtains a larger rotation angle, thereby achieving the range-increasing effect of the driving mechanism and expanding the applicable scope of the valve actuator. At the same time, the driving speed is also increased, which can improve the working efficiency of the valve operation and make the operating load of the actuator more uniform. On the other hand, the present invention is suitable for low-torque and large-stroke operations in the early stage of valve closing operation and the late stage of valve opening operation. When the driving shaft is in the second rotation stroke A2, the driving shaft rotates synchronously with the output shaft, which is suitable for high-torque and small-stroke operations in the late stage of valve closing operation and the early stage of valve opening operation.

[0030] Embodiment 2: A valve stem speed changing device, this embodiment is an improvement of the first embodiment.

[0031] In the first embodiment, the end position of the second rotation stroke A2 usually corresponds to the closed state of the valve. However, the first embodiment does not provide a self-locking device. If the valve itself or the actuator does not have a self-locking function, it is impossible to ensure that the valve stem speed change device is stably maintained at the end position of the second rotation stroke A2, and it may become loose, thereby failing to reliably maintain the valve in the closed state.

[0032] In order to solve this technical problem, the unlocking block 60 in this embodiment has a self-locking function.

[0033] As in the first embodiment, the eccentric disk 20 is provided with an unlocking block 60 , and the unlocking block 60 moves along the inner hole of the outer shell 10 .

[0034] In this embodiment, Figure 5As shown, a self-locking groove 61 is provided in the unlocking block 60, 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 housing. The self-locking groove 61 is a wedge-shaped groove, and the self-locking groove 61 is provided with a wedge angle α. The end of the self-locking groove in the first rotation direction R1 is smaller than the end of the self-locking groove 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 unlocking position, the self-locking pin 62 is in a loose state, and the unlocking block 60 can move along the inner hole 16 of the housing; 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 housing, it can be said that the self-locking pin is in the locking position, and the unlocking block 60 cannot move along the inner hole 16 of the housing toward 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 move to the locking 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 disk can rotate freely in the first rotation direction R1 but not in the second rotation direction R2.

[0035] In order to control the self-locking pin and enable the unlocking block 60 to rotate in the second rotation direction R2 in a controlled manner, 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 the cone surface of the unlocking pin 64, so that the unlocking pin 64 protrudes out of the unlocking block 60. By pressing the unlocking pin 64, the unlocking pin 64 presses the self-locking pin 62 through the cone, so that the self-locking pin moves to the unlocking position.

[0036] As described in the first embodiment, the driving arm 51 is provided with a shift block groove 52, which is a waist-shaped groove, and the inner gear ring 30 is provided with a shift block 53, which is arranged in the shift block groove 52. In order to control the unlocking of the self-locking pin, in this embodiment, Figure 3 As shown, an unlocking spacing S is provided between the shifting block groove 52 and the shifting block 53 in the width direction, and the driving arm 51 is provided with an unlocking top block 54 and a locking holding groove 55. When the driving arm 51 contacts the unlocking block 60, the unlocking pin 64 corresponds to the locking holding groove 55 and can be extended out of the unlocking block 60, and the self-locking pin 62 can move to the locking position, so that the driving 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.

[0037] Since the unlocking block 60 has a self-locking function, when the valve is in the closed state, that is, when the drive shaft 50 is stationary at the end position of the second rotation stroke A2, Fig. 9 As shown, the unlocking block 60 cannot rotate in the second rotation direction R2 (ie, the valve opening operation direction), so that the eccentric disk 20, the inner gear ring 30 and the output shaft 40 can all remain stationary, so that the valve can be stably kept in a closed state.

[0038] When the valve is opened, the drive shaft 50 rotates in the second rotation direction R2, the drive arm 51 moves the unlocking distance S in the direction of disengaging the unlocking block 60, the unlocking top block 54 presses the unlocking pin 64 to protrude out of the unlocking block 60, and the unlocking pin 64 pushes the self-locking pin 62 to the unlocking position through the conical surface, so that the eccentric disk can move in the second rotation direction R2. Fig.10 Then the driving arm 50 moves the shifting block 53, driving the inner gear ring, the eccentric disk and the output shaft to rotate in the second rotation direction R2 to the starting position of the second rotation stroke A2, as shown in FIG. Fig.11 During this process, the unlocking push block 54 keeps pressing the unlocking pin 64, so that the self-locking pin 62 remains in the unlocking position. Afterwards, the driving shaft 50 continues to rotate in the second rotation direction R2, the unlocking push block 54 of the driving arm 51 completely disengages from the unlocking block 60, and the self-locking spring 63 pushes the self-locking pin 62, and the self-locking pin 62 remains in the locked position, as shown in FIG. Fig.12 shown.

[0039] The technical solution of this embodiment can effectively prevent the valve stem speed change device from loosening when the valve is in the closed state, so that the valve can be reliably kept in the closed state.

Claims

1. A valve stem speed change device, characterized in that: The invention comprises a housing (10), an eccentric disk (20), an inner gear ring (30), an output shaft (40) and a drive shaft (50), wherein the eccentric disk (20) rotates in the housing (10), the eccentric disk (20) is provided with an eccentric hole (21), the inner gear ring (30) rotates in the eccentric hole (21), the output shaft (40) is provided with an output gear (41), the output gear (41) meshes with the inner teeth (31) of the inner gear ring, and the drive shaft (50) is provided with a drive arm (51), the drive arm (51) moves the inner gear ring (31) to rotate. 0); within a first rotation stroke (A1) of the drive shaft (50), the eccentric disk (20) is locked in the housing (10), the drive shaft (50) drives the inner gear ring (30) to rotate, and the inner gear ring (30) drives the output shaft (40) to rotate; within a second rotation stroke (A2) of the drive shaft (50), the inner gear ring (30) is locked in 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), and within the second rotation stroke (A2), the drive shaft (50) drives the unlocking block (60) to rotate in the first rotation direction (R1); the eccentric disk (20) is provided with a limit block (24), and the housing (10) is provided with a locking block (12), and within the first rotation stroke (A1) of the drive shaft, the locking block (12) blocks the limit 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), and within a first rotation stroke (A1) of the drive shaft, the locking body (23) locks the eccentric disk (20) within the housing (10); within a second rotation stroke (A2) of the drive shaft, the locking body (23) locks the inner gear ring (30) within the eccentric disk (20), and the drive shaft (50) moves the inner gear ring (30) to drive the eccentric disk (20) to rotate in a second rotation 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), 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 hole 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) escapes from the unlocking groove (32) and embeds into the locking groove (11); when the inner gear ring (30) is locked in the eccentric disk (20), the locking body (23) escapes from the locking groove (11) and embeds into 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 inner gear ring (30) to rotate along the first rotation direction (R1) until the unlocking groove (32) corresponds 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) to escape from the locking groove (11) and embed into the unlocking groove (32), and the inner 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 limit block (24), and the housing (10) is provided with a locking block (12). When the eccentric disk (20) rotates along the second rotation direction (R2) until the limit block (24) contacts the locking block (12), the locking body guide hole (22) rotates to a position corresponding to the locking groove (11), the eccentric disk (20) stops rotating, the drive shaft (50) pushes the inner gear ring (30) to rotate, and the inner gear ring (30) pushes the locking body (23) to escape from the unlocking groove (32) and embed into the locking groove (11), and the eccentric disk (20) is locked in the housing (10).

7. The valve stem speed change device according to claim 1, characterized in that: The driving arm (51) is provided with a shift block groove (52), the shift block groove (52) being a waist-shaped groove, the inner gear ring (30) is provided with a shift block (53), the shift block (53) being arranged in the shift block groove (52), and within the first rotation stroke (A1), the driving shaft (50) drives the inner gear ring (30) to rotate within the eccentric hole (21) via the shift block (53); within the second rotation stroke (A2), the driving shaft (50) drives the eccentric disk (20) to rotate in a second rotation direction (R2) via the shift block (53).

8. The valve stem speed change device according to claim 7, characterized in that: The shift block (53) is a bar-shaped block, and the shift block (53) is hinged to the inner 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), the unlocking block (60) moves along the inner hole of the housing (10), the unlocking block (60) is provided with a self-locking groove (61), the self-locking groove (61) is a wedge-shaped groove, a self-locking pin (62) is provided in the self-locking groove, the unlocking block (60) is provided with a self-locking spring (63) for pushing the self-locking pin (62) to move toward a locked position, the unlocking block (60) is provided with an unlocking pin (64) for pushing the self-locking pin (62) to move toward an unlocking position, and when the self-locking pin (62) is in the locked position, the unlocking pin (64) protrudes out of the unlocking block (60).

10. The valve stem speed change device according to claim 9, characterized in that: The driving arm (51) is provided with a shift block groove (52), the shift block groove (52) is a waist-shaped groove, the inner gear ring (30) is provided with a shift block (53), the shift block (53) is arranged in the shift block groove (52), an unlocking spacing (S) is provided between the shift block groove (52) and the shift block (53) in the width direction, and the driving arm (51) is provided with an unlocking top block (54) and a locking holding groove (55); when the driving 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 distance (S) in a direction away from the unlocking block (60), the unlocking push block (54) pushes the unlocking pin (64), and the unlocking pin (64) pushes the self-locking pin (62) to move to the unlocking position.

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