Variable-speed range-extending operation device

Abstract

The invention relates to a variable-speed range-extending operating device which comprises an inner gear ring, a planet carrier, a planet wheel and a sun wheel which form a planetary gear system, the inner gear ring is arranged in an outer fixing ring, the planet carrier is connected with an input shaft, and the inner gear ring is provided with a locking body; when the locking body is at the locking position, the inner gear ring is fixed at the locking position, and the planet carrier rotates relative to the inner gear ring; and when the locking body is in the unlocking position, the inner gear ring and the planet carrier synchronously rotate in the outer fixing ring. The planetary gear mechanism is combined with the segmented operation control device, the output rotation stroke can be larger than the input rotation stroke, segmented operation control is adopted, different driving speeds can be achieved, the actuator is combined with the 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 speed-changing and range-increasing operating 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 2021217521001) 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, the common feature of such valves with operating strokes greater than 90° is that most of the operating stroke of the valve is a no-load stroke (or light-load stroke), and only a small operating stroke when the valve reaches the closed position will require a large operating load, which also leads to uneven power density of the actuator during operation. Summary of the invention

[0003] The purpose of the present invention is to provide a speed-changing and range-extending operating device to improve the operating performance of an actuator.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a speed change and range increase operating device, comprising an inner ring gear 10, a planetary carrier 20, a planetary gear 21 and a sun gear 30 constituting a planetary gear system, the inner ring gear 10 is arranged in an outer fixed ring 40, the inner ring gear 10 and the outer fixed ring 40 are rotatably matched, the planetary carrier is connected to an input shaft 50, and the inner ring gear 10 is provided with a locking body 11; the locking body 11 locks the connection between the inner ring gear 10 and the outer fixed ring 40 and unlocks the connection between the inner ring gear 10 and the planetary carrier 20 in a locked position, the inner ring gear is fixed in a locked position, and the planetary carrier 20 rotates relative to the inner ring gear 10; the locking body 11 unlocks the connection between the inner ring gear 10 and the outer fixed ring 40 and locks the connection between the inner ring gear 10 and the planetary carrier 20 in an unlocked position, and the inner ring gear 10 and the planetary carrier 20 rotate synchronously in the outer fixed ring 40.

[0005] Furthermore, a structure for realizing the operation of the locking body is that the inner gear ring is provided with a locking body guide hole 12, the locking body 11 moves in the locking body guide hole 12, the inner hole wall 43 of the outer fixed ring is provided with a locking groove 41, and the planetary carrier is provided with an unlocking groove 22, when the locking body is in the locking position, the locking body 11 escapes from the unlocking groove 22 and is embedded in the locking groove 41; when the locking body is in the unlocking position, the locking body 11 escapes from the locking groove 41 and is embedded in the unlocking groove 22.

[0006] Furthermore, a locking body installation structure is provided, wherein the inner gear ring is provided with a locking block 13, the locking block 13 is provided with the locking body guide hole 12, the inner hole wall 43 of the outer fixed ring 40 is provided with a limit block 42, the planetary carrier is provided with an unlocking block 23, the locking block 13 is arranged between the inner hole wall 43 of the outer fixed ring and the planetary carrier 20, and the locking block 13 touches the limit block 42 and the unlocking block 23 in the circumferential direction.

[0007] Furthermore, in order to realize the locking and unlocking functions of the locking body, when the planetary carrier 20 rotates along the first turning direction R1 to the position where the unlocking groove 22 corresponds to the locking groove 41, the unlocking block 23 touches the locking block 13, and when the planetary carrier 20 continues to rotate along the first turning direction R1, the unlocking block 23 pushes the locking block 13, and the locking block 13 pushes the locking body 11 out of the locking groove 41 and into the unlocking groove 22, and the locking body enters the unlocking position; during the rotation of the planetary carrier 20 along the second turning direction R2, when the unlocking groove 22 rotates to the position corresponding to the locking groove 41, the locking block 13 touches the limit block 42, and the limit block 42 prevents the locking block 13 from moving, and the unlocking groove 22 pushes the locking body 11 out of the unlocking groove 22 and into the locking groove 41, and the locking body enters the locked position.

[0008] Furthermore, an input structure of a speed-changing and range-extending operating device is that the speed-changing and range-extending operating device is provided with an upper cover 60 , the upper cover 60 is mounted on the outer fixing ring 40 , the input shaft 50 extends out of the upper cover, and the input shaft is connected to the planet carrier 20 .

[0009] Furthermore, an output structure of a speed-changing and range-extending operating device is that the speed-changing and range-extending operating device is provided with a bottom cover 70, the bottom cover 70 is mounted on the outer fixed ring 40, the sun gear 30 is provided with an output shaft 31, the output shaft is exposed from the bottom cover 70, and the output shaft is provided with an output shaft hole 32.

[0010] Furthermore, in order to reduce the radial size of the device and adjust the transmission ratio, the planetary gear 21 is a double gear having a first gear 21a and a second gear 21b, wherein the first gear 21a meshes with the sun gear 30 and the second gear 21b meshes with the inner gear ring 10.

[0011] Furthermore, the pitch circle of the first gear 21 a is larger than the pitch circle of the second gear.

[0012] The beneficial effects of the present invention are as follows: the variable speed and range extending operating device adopts a planetary gear mechanism combined with a segmented operation control device, the output rotational stroke can be greater than the input rotational stroke, and the segmented operation control can achieve different driving speeds. When combined with the actuator, the actuator can operate a valve that is greater than its own stroke, improve the operating efficiency, and balance the operating load of the actuator.

[0013] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] 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 3 It is a plan view of the present invention, omitting the upper cover; Figure 4 yes Figure 3 AA section view; Figure 5 is a schematic diagram of the motion of the present invention, in the initial position of operation; Figure 6 It is a motion schematic diagram of the present invention, where the planet carrier rotates to a position corresponding to the unlocking groove and the locking groove; Figure 7 is a schematic diagram of the movement of the present invention, wherein the locking body enters the unlocking position; Figure 8It is a motion diagram of the present invention, in which the planet carrier and the inner gear ring rotate synchronously; Fig. 9 It is a motion schematic diagram of the present invention, the unlocking slot rotates to a position corresponding to the locking slot, and the locking block touches the limit block; Fig.10 It is a motion schematic diagram of the present invention, the unlocking groove pushes the locking body out of the unlocking groove and into the locking groove, and the locking body enters the locking position; Fig.11 It is a schematic diagram of the motion of the present invention, and the planet carrier returns to the initial position; Fig.12 It is a structural diagram of the present invention, and the planetary gear adopts a double gear; Fig.13 yes Fig.12 Cross-section of the structure; Fig.14 It is a schematic diagram of the structure of the present invention applied to a forced sealing ball valve; Fig.15 It is a schematic diagram of the present invention applied to a forced sealing ball valve, with the valve in an open position; Fig.16 It is a schematic diagram of the application of the present invention to a forced sealing ball valve, the variable speed range-extending operating device completes the light load motion stroke, and the first valve disc driving member, the second valve disc driving member and the two sealing valve discs rotate to the closed position; Fig.17 It is a schematic diagram of the application of the present invention to a forced sealing ball valve, in which the variable speed and range-extending operating device completes a high-load motion stroke, and the sealing valve disc presses against the valve seat to achieve forced sealing.

[0015] In order to make the drawings clear, some standard common parts, such as screws, bolts, clamps, gaskets, etc., are omitted in the above drawings. DETAILED DESCRIPTION

[0016] Embodiment 1: like Figures 1 to 4 A speed-changing and range-increasing operating device includes an inner ring gear 10, a planetary carrier 20, a planetary gear 21 and a sun gear 30 constituting a planetary gear system, wherein the inner ring gear 10 is arranged in an outer fixed ring 40.

[0017] The inner gear ring 10 is provided with a locking block 13, which protrudes from the upper end of the inner gear ring. Figure 2 The locking block 13 is provided with a locking body guide hole 12.

[0018] The planetary gear system is provided with four planetary gears 21 . The planetary gears 21 are gears arranged between the inner gear ring and the sun gear. The four planetary gears are mounted on a planet carrier 20 .

[0019] The planet carrier 20 is a disc-shaped structure, and is provided with a protruding unlocking block 23. An unlocking groove 22 is provided adjacent to the unlocking block 23, and the unlocking groove 22 is a spherical groove. The planet carrier 20 is provided with a spline hole 24. In order to install the planetary gear 21, a planetary gear base plate 26 is further provided in this embodiment, and the planetary gear 21 is installed between the planetary carrier 20 and the planetary carrier base plate 26.

[0020] The inner hole wall 43 of the outer fixing ring 40 is provided with a locking groove 41, which is an arc surface groove. The inner hole wall of the outer fixing ring is also provided with a limit block 42, which protrudes from the inner hole wall on the upper side of the inner hole wall 43 of the fixing ring. Figure 2 The outer fixing ring 40 also serves as the outer shell structure of the speed-changing and range-increasing operating device.

[0021] An upper cover 60 is disposed at the upper end of the outer fixing ring 40 , and a bottom cover 70 is disposed at the lower end of the outer fixing ring 40 .

[0022] The planet carrier 20 is connected to the input shaft 50. The input shaft 50 is provided with a tooth spline 51 connected to the spline hole 24. The input shaft 50 extends out of the upper cover 60.

[0023] The sun gear 30 is a gear meshing with the planetary gear 21. The sun gear 30 is provided with an output shaft 31. In this embodiment, in order to cooperate with the valve stem of the valve, the output shaft is provided with an output shaft hole 32. The output shaft is exposed from the bottom cover 70 so as to be connected to the valve stem.

[0024] The inner gear ring 10 is installed in the outer fixed ring 40, and the inner gear ring 10 is rotated with the inner hole wall 43 of the outer fixed ring below the limit block 42. The locking block 13 of the inner gear ring is set between the inner hole wall 43 of the outer fixed ring and the planet carrier 20, and the locking block 13 touches the limit block 42 and the unlocking block 23 in the circumferential direction.

[0025] A locking body 11 is provided in the locking body guide hole 12. The locking body 11 is a sphere and moves in the locking body guide hole 12. The locking body can be defined as moving between two positions: a locked position and an unlocked position. When the locking body is in the locked position, the locking body 11 escapes from the unlocking groove 22 and is embedded in the locking groove 41 (see Figure 1 , Figure 3 When the locking body is in the unlocking position, the locking body 11 escapes from the locking groove 41 and is embedded in the unlocking groove 22 (see reference Figure 7 position of the locking body in the center).

[0026] In this embodiment, the locking body 11 is a spherical structure. As an alternative structure, the locking body may also adopt other types of structures, such as a cylindrical structure, a conical structure, and cooperate with corresponding unlocking grooves and locking groove structures.

[0027] When the planet carrier 20 rotates along the first rotation direction R1 to a position where the unlocking groove 22 and the locking groove 41 correspond (such as Figure 6 As shown, the unlocking block 23 touches the locking block 13; when the planet carrier 20 continues to rotate along the first direction R1 (as shown in Figure 7 As shown in the figure, the unlocking block 23 pushes the locking block 13, and the locking block 13 pushes the locking body 11 out of the locking groove 41 and into the unlocking groove 22, and the locking body enters the unlocking position; when the planet carrier 20 rotates along the second steering direction R2, when the unlocking groove 22 rotates to the position corresponding to the locking groove 41 (as shown in the figure), the unlocking block 23 pushes the locking block 13, and the locking body 11 is pushed ... Fig. 9 As shown in FIG. 1 ), the locking block 13 contacts the limit block 42, and the limit block 42 prevents the locking block 13 from moving, that is, prevents the movement of the inner gear ring 10; when the planet carrier 20 continues to rotate along the second direction R2 (as shown in FIG. 1 ), the locking block 13 contacts the limit block 42, and the limit block 42 prevents the locking block 13 from moving, that is, prevents the movement of the inner gear ring Fig.10 As shown in FIG. 4 ), the unlocking groove 22 pushes the locking body 11 out of the unlocking groove 22 and into the locking groove 41, and the locking body enters the locking position.

[0028] The locking body 11 locks the connection between the inner gear ring 10 and the outer fixed ring 40 in the locked position, unlocks the connection between the inner gear ring 10 and the planet carrier 20, the inner gear ring is fixed in the locked position, and the planet carrier 20 rotates relative to the inner gear ring 10 (rotates in the inner gear ring). The locking body 11 unlocks the connection between the inner gear ring 10 and the outer fixed ring 40 in the unlocked position, locks the connection between the inner gear ring 10 and the planet carrier 20, and the inner gear ring 10 and the planet carrier 20 rotate synchronously in the outer fixed ring 40.

[0029] like Figures 5 to 11 The movement process of the speed-changing and range-extending operating device of this embodiment is that, in the initial position, Figure 5 As shown, the locking body 11 is in the locking position, and the unlocking block 23 and the unlocking groove 22 of the planet carrier 20 are both located on the rear side of the locking body at the first turning direction R1. The planet carrier 20 rotates along the first turning direction R1 toward the locking body. Since the outer circular wall 25 of the planet carrier can prevent the locking body 11 from escaping from the locking groove 41, the locking body is kept in the locking position. In this process, the inner gear ring remains stationary, the planet carrier 20 rotates in the inner gear ring 10, the planetary gear 21 meshes with the inner gear ring and rotates, and the rotation direction of the planetary gear 21 is opposite to the rotation direction of the planet carrier 20, and the sun gear 30 meshes with the planetary gear 21 and rotates, and the sun gear 30 and the planet carrier have the same rotation direction (R1 direction). According to the transmission principle of the planetary gear, the rotation speed of the sun gear 30 is greater than the rotation speed of the planet carrier.

[0030] According to the transmission calculation formula of planetary gears: ω1-(1+α)ω2+αω3=0 Where ω1 is the sun gear speed, ω2 is the planet carrier speed, ω3 is the inner gear ring speed, and α is the gear ratio between the inner gear ring and the sun gear. In combination with the legend of this embodiment, the number of teeth of the inner gear ring is 80, the number of teeth of the sun gear is 20, ω3=0, then: ω1-(1+80 / 20)ω2=0, ω1 / ω2=5, and the transmission ratio i between the planet carrier and the sun gear in this embodiment is 5.

[0031] Since the input shaft 50 rotates synchronously with the planet carrier 20, during this period, the sun gear 30 rotates at a speed 5 times that of the input shaft, and the rotation stroke of the sun gear is also 5 times that of the input shaft. Similarly, the speed and rotation stroke of the output shaft 31 of the sun gear are also 5 times that of the input shaft.

[0032] like Figure 6 When the planet carrier 20 rotates to the position where the unlocking groove 22 and the locking groove 41 correspond, the unlocking block 23 touches the locking block 13. Figure 7 As shown, when the planetary carrier 20 continues to rotate along the first turning direction R1, it pushes the locking block 13 to move, and the unlocking block 23 pushes the locking block 13. Since the locking groove 41 is an arc groove, the locking block 13 pushes the locking body 11 to disengage from the locking groove 41 and embed into the unlocking groove 22, and the locking body enters the unlocking position.

[0033] Afterwards, if Figure 8 As shown, the planet carrier 20 will push the inner gear ring 10 to rotate synchronously, and the inner hole wall 43 of the outer fixed ring can prevent the locking body 11 from escaping from the unlocking groove 22, so that the locking body remains in the unlocking position. In this process, the planet carrier 20 rotates synchronously with the inner gear ring 10, and the planetary gear 21 only revolves around the sun gear 30, and the planetary gear 21 does not rotate on its own. At the same time, the planetary gear 21 drives the sun gear and the planet carrier 20 to rotate synchronously, thereby realizing the synchronous rotation of the input shaft 50 and the sun gear 30 (and the output shaft 31), that is, the transmission ratio i=1.

[0034] Afterwards, when the planet carrier 20 rotates along the second rotation direction R2 (the opposite direction of the first rotation direction R1), when the unlocking groove 22 rotates to a position corresponding to the locking groove 41, as shown in FIG. Fig. 9 As shown in FIG. 1 , the locking block 13 contacts the limiting block 42, and the limiting block 42 prevents the locking block 13 from moving, that is, prevents the movement of the inner gear ring 10. When the planet carrier 20 continues to rotate along the second direction R2, as shown in FIG. Fig.10 As shown, the unlocking groove 22 pushes the locking body 11 to disengage from the unlocking groove 22 and embed into the locking groove 41, and the locking body enters the locking position.

[0035] The locking body 11 unlocks the connection between the inner gear ring 10 and the planet carrier 20 in the locking position, and the planet carrier 20 can continue to rotate along the second rotation direction R2 and return to the initial position. Fig.11As shown. In this process, the inner gear ring remains stationary, the planet carrier 20 rotates in the inner gear ring 10, the planetary gear 21 rotates in mesh with the inner gear ring, and the rotation direction of the planetary gear 21 is opposite to the rotation direction of the planetary carrier 20 (R1 direction), and the sun gear 30 rotates in mesh with the planetary gear 21, and the sun gear 30 and the planetary carrier rotate in the same direction (R2 direction). Similarly, the sun gear rotates at a speed 5 times that of the input shaft, and the rotation stroke of the sun gear is also 5 times that of the input shaft.

[0036] In this embodiment, the locking block 13, the locking body 11, the unlocking groove 22, the unlocking block 23, the locking groove 41, and the limit block 42 constitute a segmented operation control device. Combined with the characteristics of the variable transmission ratio of the planetary gear system, the output rotation stroke can be greater than the input rotation stroke. By adopting segmented operation control, different transmission speeds can be achieved.

[0037] Embodiment 2: like Fig.12 , Fig.13 , a speed-changing and range-extending operating device, this embodiment is a structural improvement of the first embodiment.

[0038] In this embodiment, the planetary gear 21 is a double gear having a first gear 21 a and a second gear 21 b . The first gear 21 a meshes with the sun gear 30 , and the second gear 21 b meshes with the inner gear ring 10 .

[0039] In this embodiment, the inner ring gear 10, the planetary gear 21 and the sun gear 30 use the same gear module, and the number of teeth of the first gear 21a is greater than the number of teeth of the second gear 21b, that is, the pitch circle of the first gear 21a is larger than the pitch circle of the second gear.

[0040] The structure of this embodiment can reduce the radial size of the device.

[0041] By adopting the structure of this embodiment, the transmission ratio between the input shaft and the output shaft can also be adjusted. In combination with this embodiment, the number of teeth of the inner gear ring is 68, the number of teeth of the sun gear is 20, the number of teeth of the first gear 21a of the planetary gear is 28, and the number of teeth of the second gear 21b of the planetary gear is 20. According to the calculation formula ω1-(1+α)ω2+αω3=0, α=(28×68) / (20×20)=4.76, ω3=0, then: ω1-(1+4.76)ω2=0, ω1 / ω2=5.76, the transmission ratio i of the planetary carrier and the sun gear in this embodiment is 5.76.

[0042] Embodiment three: like Figures 14 to 17 This embodiment is an application of the variable speed and range extending operating device of the first embodiment on a forced sealing ball valve.

[0043] The forced sealing ball valve includes the forced sealing ball valve disclosed in the Chinese invention patent "A DBB forced sealing ball valve driving structure" (application number 2021217521001).

[0044] The forced sealing ball valve is provided with a valve body 81, a valve seat 82, a valve cover 83, a valve stem 84, a first valve flap driving member 85, a second valve flap driving member 86 and a sealing valve flap 87. The forced sealing ball valve is operated by the valve stem 84 to realize the opening, closing and sealing of the valve. The valve stem can complete the closing and forced sealing of the valve in a one-way rotation process, and can also release the forced sealing and open the valve in a one-way rotation process. The valve stem drives the first valve flap driving member, the second valve flap driving member and the two sealing valve flaps to rotate. The first valve flap driving member, the second valve flap driving member and the two sealing valve flaps rotate within the rotation stroke (R1=90°) between the open position and the closed position. After the first valve flap driving member 85, the second valve flap driving member 83 and the two sealing valve flaps 87 rotate to the closed position, the valve stem rotates relative to the first valve flap driving member, pushing the sealing valve flap to press the valve seat, and realizing forced sealing.

[0045] According to the operational characteristics of the forced sealing ball valve, the closing operation of the valve requires the valve stem to rotate an operating stroke greater than 90°. First, the valve stem drives the two sealing valve flaps to rotate 90° from the open position to the closed position. At this stage, there is a gap between the sealing valve flap and the valve seat, the sealing valve flap is in a frictionless rotation state, and the valve stem is in a light-load motion. After that, the valve stem continues to rotate, and the first valve flap driver 85 and the second valve flap driver 86 move in the separation direction, driving the sealing valve flap 87 to press the valve seat 82 to achieve forced sealing. At this stage, the sealing valve flap gradually reduces the gap between the valve seat and the valve stem, and the valve stem is also in a light-load motion; when the sealing valve flap begins to contact and press the valve seat, the valve stem is in a high-load motion. The last smaller stroke is in a high-load motion.

[0046] In this embodiment, the speed-changing and range-extending operating device is installed on the forced sealing ball valve, and the bottom cover 70 of the speed-changing and range-extending operating device is fixed on the valve cover 83 of the forced sealing ball valve. The valve stem 84 cooperates with the output shaft hole 32, so that the output shaft 31 drives the valve stem 84 to rotate synchronously.

[0047] Through actual measurement and verification, the operating characteristics of the forced sealing ball valve can be determined. For example, in this embodiment, the total operating stroke of the forced sealing ball valve is 300°, of which the light load movement stroke of the valve stem is 270° and the high load movement stroke is 30°. When the variable speed and range operating device is installed, the initial position of the variable speed and range operating device (such as Figure 5) corresponds to the open position of the forced sealing ball valve, and the angular travel difference γ between the locking body 11 and the unlocking groove 22 is 54°. By adjusting the installation position of the planetary gear 21 and the inner gear ring 10, or by adjusting the installation position of the toothed spline 51 of the input shaft and the spline hole 24, the initial position of the speed-changing and range-extending operating device can be adjusted.

[0048] During the valve closing operation, the input shaft 50 of the speed-changing and range-extending operating device rotates by an angular stroke of γ (direction R1, 54°). During this process, the locking body 11 is in the locked position, the planet carrier 20 rotates relative to the inner gear ring, and the rotation stroke of the output shaft 31 of the sun gear is 5 times that of the input shaft. Then, the valve stem 84 rotates 270° at a higher speed to complete the light load motion stroke (such as Fig.15 Rotate to Fig.16 After that, the locking body 11 enters the unlocking position, the inner gear ring rotates synchronously with the planet carrier, and the output shaft 31 of the sun gear also rotates synchronously with the input shaft 50, completing a 30° high-load motion stroke rotation (such as Fig.16 Rotate to Fig.17 position), to realize the forced sealing operation of the ball valve.

[0049] During the operation of opening the valve, the input shaft 50 of the speed-changing and range-extending operating device rotates 30° (R2 direction). During this process, the locking body 11 is in the unlocking position, the inner gear ring rotates synchronously with the planet carrier, and the output shaft 31 of the sun gear also rotates synchronously with the input shaft 50, so that the ball valve is released from the forced seal with a high-load motion stroke. After that, the locking body 11 enters the locking position, the planet carrier 20 rotates relative to the inner gear ring, the rotation stroke of the output shaft 31 of the sun gear is 5 times that of the input shaft, and the input shaft 50 rotates γ angular stroke (54°), then the valve stem 84 rotates 270° at a higher speed, completing the light-load motion stroke, and returning the ball valve to the open position.

[0050] This embodiment adopts a variable speed range-extending operating device, and the opening and closing operation of the forced sealing ball valve requiring a stroke of 300° can be realized by rotating the input shaft 84°, so the operation of the forced sealing ball valve can be realized by using a conventional 90° valve operating actuator on the market. The operating strokes of forced sealing ball valves of different specifications are not the same, and can be matched by adjusting the gear ratio of the variable speed range-extending operating device.

[0051] According to the operating characteristics of the forced seal ball valve, the input torque of the valve stem is small during the light load movement stage, and the power density is low. During the high load movement stage, when the valve disc is pressed against the valve seat, the input torque of the valve stem needs to be increased, and the power density is high. The existing constant speed actuator will increase the switching time and have low efficiency.

[0052] The present invention uses a fast gear to operate in the stage of low operating torque during the valve switching process, compresses the operating stroke, and improves the power density. Use a slow gear to operate in the stage of high operating torque during the valve switching process to reduce the speed and increase the torque, so that the efficiency of the valve switching operation process is significantly improved, and the speed ratio of the fast and slow gears can be customized to control the operating stroke of the valve within a 90° stroke. Valves such as forced sealing ball valves with an operating stroke greater than 90° can be matched with conventional actuators, reducing the difficulty of application and promotion of special valves. The variable speed and range-extending operating device can also be used on valves such as gate valves and stop valves that have staged operating torque characteristics during the switching process to improve operating efficiency.

Claims

1. A variable speed and range-extending operating device, characterized in that: The invention comprises an inner gear ring (10), a planet carrier (20), a planetary gear (21) and a sun gear (30) constituting a planetary gear system, wherein the inner gear ring (10) is arranged in an outer fixed ring (40), the inner gear ring (10) and the outer fixed ring (40) are rotationally matched, the planet carrier is connected to an input shaft (50), and the inner gear ring (10) is provided with a locking body (11); the locking body (11) locks the connection between the inner gear ring (10) and the outer fixed ring (40) and unlocks the connection between the inner gear ring (10) and the planet carrier (20) in a locking position, the inner gear ring is fixed in the locking position, and the planet carrier (20) rotates relative to the inner gear ring (10); the locking body (11) unlocks the connection between the inner gear ring (10) and the outer fixed ring (40) and locks the connection between the inner gear ring (10) and the planet carrier (20) in an unlocking position, and the inner gear ring (10) and the planet carrier (20) rotate synchronously in the outer fixed ring (40).

2. The speed-changing and range-extending operating device according to claim 1, characterized in that: The inner gear ring is provided with a locking body guide hole (12), the locking body (11) moves in the locking body guide hole (12), the inner hole wall (43) of the outer fixed ring is provided with a locking groove (41), and the planet carrier is provided with an unlocking groove (22), when the locking body is in the locking position, the locking body (11) escapes from the unlocking groove (22) and embeds into the locking groove (41); when the locking body is in the unlocking position, the locking body (11) escapes from the locking groove (41) and embeds into the unlocking groove (22).

3. The speed-changing and range-extending operating device according to claim 2, characterized in that: The inner gear ring is provided with a locking block (13), the locking block (13) is provided with the locking body guide hole (12), the inner hole wall (43) of the outer fixed ring (40) is provided with a limit block (42), the planet carrier is provided with an unlocking block (23), the locking block (13) is arranged between the inner hole wall (43) of the outer fixed ring and the planet carrier (20), and the locking block (13) contacts the limit block (42) and the unlocking block (23) in the circumferential direction.

4. The speed-changing and range-extending operating device according to claim 3, characterized in that: When the planet carrier (20) rotates along the first rotation direction (R1) to a position where the unlocking groove (22) corresponds to the locking groove (41), the unlocking block (23) touches the locking block (13); when the planet carrier (20) continues to rotate along the first rotation direction (R1), the unlocking block (23) pushes the locking block (13); the locking block (13) pushes the locking body (11) to disengage from the locking groove (41) and embed into the unlocking groove (22); and the locking body enters the unlocking position; when the planet carrier (20) rotates along the second rotation direction (R2), when the unlocking groove (22) rotates to a position corresponding to the locking groove (41), the locking block (13) touches the limiting block (42); the limiting block (42) prevents the locking block (13) from moving; the unlocking groove (22) pushes the locking body (11) to disengage from the unlocking groove (22) and embed into the locking groove (41); and the locking body enters the locking position.

5. The speed-changing and range-extending operating device according to claim 1, characterized in that: The speed-changing and range-increasing operating device is provided with an upper cover (60), the upper cover (60) being mounted on the outer fixing ring (40), the input shaft (50) extending out of the upper cover, and the input shaft is connected to the planet carrier (20).

6. The speed-changing and range-extending operating device according to claim 1, characterized in that: The speed-changing and range-increasing operating device is provided with a bottom cover (70), the bottom cover (70) being mounted on the outer fixing ring (40), the sun gear (30) being provided with an output shaft (31), the output shaft being exposed from the bottom cover (70), and the output shaft being provided with an output shaft hole (32).

7. The speed-changing and range-extending operating device according to claim 1, characterized in that: The planetary gear (21) is a double gear having a first gear (21a) and a second gear (21b), wherein the first gear (21a) meshes with the sun gear (30), and the second gear (21b) meshes with the inner gear ring (10).

8. The speed-changing and range-extending operating device according to claim 7, characterized in that: The pitch circle of the first gear (21a) is larger than the pitch circle of the second gear.

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