Ball valve gear box

Abstract

The application discloses a ball valve gear box, which comprises a top cover, an upper box body, a middle box body, a lower box body, a double-idler mechanism arranged between the top cover and the upper box body, a first planetary gear mechanism arranged between the upper box body and the middle box body, and a second planetary gear mechanism arranged between the middle box body and the lower box body. The double-idler mechanism comprises a driving wheel, a first idler, a second idler, a driven wheel and a driving shaft for driving the driving wheel to rotate, the driving wheel is sleeved outside the driving shaft, the first idler and the second idler are engaged with the driving wheel and the driven wheel, the upper part of the first planetary gear mechanism is connected with the driven wheel, the lower part of the first planetary gear mechanism is connected with the upper part of the second planetary gear mechanism, and the lower part of the second planetary gear mechanism is used for being connected with the top part of a valve rod of an underwater ball valve. The ball valve gear box can realize the function of operating a valve with a large torque, and has a compact structure and is helpful to realize modular application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve, in particular to a double-idler double-planetary structure's (underwater) ball valve gear box. BACKGROUND

[0002] At present, the state has determined the offshore oil engineering equipment as one of the key high-end equipment manufacturing industries, and the underwater valve is an indispensable type in various offshore oil engineering equipment. The underwater valve (flat gate valve, ball valve, etc.) is widely used in underwater Christmas tree, underwater gathering and transportation manifold, offshore pipeline and other gas and liquid medium exploitation and pipeline systems due to its small flow resistance, reliable sealing and long service life. Especially in the process of offshore oil and gas exploration or development, with the development of deep sea oil and gas fields and the increasing demand for large aperture and high pressure valves, underwater ball valves are increasingly used in deep sea environments. The driving device on the underwater ball valve usually includes manual operation, gear box operation, hydraulic operation and other types, among which, the gear box operation is a commonly used form.

[0003] However, the existing underwater valve gear box has a small operable torque range, which is difficult to meet the use requirements of large size and high pound ball valves for large torque; moreover, the design is not compact, has multiple redundant structures and occupies a large space, which increases the manufacturing cost and installation difficulty; for large torque operation requirements, the reliability and stability of ordinary gear transmission in strength and load bearing will decrease, and the underwater valve usually requires a maintenance-free service life of more than 20 years, so the gear box needs to have high reliability and stability. SUMMARY

[0004] Therefore, in order to overcome the defects of the prior art, the purpose of the present application is to provide an underwater ball valve gear box which is compact and stable and can effectively meet the operation requirements of large torque valves.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] An underwater ball valve gear box comprises a top cover, an upper box body, a middle box body, a lower box body, a double-idler mechanism arranged between the top cover and the upper box body, a first planetary gear mechanism arranged between the upper box body and the middle box body, and a second planetary gear mechanism arranged between the middle box body and the lower box body. The double-idler mechanism comprises a driving wheel, a first idler, a second idler, a driven wheel and a driving shaft for driving the driving wheel to rotate. The driving wheel is sleeved outside the driving shaft. The first idler and the second idler are engaged with the driving wheel and the driven wheel. The upper part of the first planetary gear mechanism is connected with the driven wheel. The lower part of the first planetary gear mechanism is connected with the upper part of the second planetary gear mechanism. The lower part of the second planetary gear mechanism is used for connecting with the top part of a valve stem of an underwater ball valve.

[0007] The double idler structure of the first idler and the second idler realizes one-stage increase of torque; the first planetary gear mechanism realizes two-stage increase of torque; and the second planetary gear mechanism realizes three-stage increase of torque.

[0008] According to some preferred embodiments of the present application, a driving connection mechanism is included, which comprises an interface and a connecting rod, the upper end of the connecting rod penetrating into the interface, and the lower end of the connecting rod being connected with the upper end of the driving shaft. The interface is an ROV interface.

[0009] According to some preferred embodiments of the present application, the first planetary gear mechanism comprises a first inner gear, a first sun gear and a plurality of first planetary gears distributed between the first inner gear and the first sun gear, the top of the first sun gear being keyed with the bottom of the driven gear.

[0010] According to some preferred embodiments of the present application, the first planetary gear mechanism comprises a first carrier and a first hub arranged above and below the first planetary gears respectively, and the first hub being connected with the upper part of the second planetary gear mechanism.

[0011] According to some preferred embodiments of the present application, the second planetary gear mechanism comprises a second inner gear, a second sun gear and a plurality of second planetary gears distributed between the second inner gear and the second sun gear, the top of the second sun gear being keyed with the first hub.

[0012] According to some preferred embodiments of the present application, the second planetary gear mechanism comprises a second carrier and a second hub arranged above and below the second planetary gears respectively, and a connecting groove being formed in the second hub, and the valve rod top of the underwater ball valve being connected in the connecting groove.

[0013] According to some preferred embodiments of the present application, a limiting block is arranged on the second hub, a stopper matching with the limiting block is arranged on the lower box, and a limiting rod penetrating through the stopper and a limiting cap for sealing are further arranged on the lower box, and the limiting cap being arranged at the end of the limiting rod.

[0014] According to some preferred embodiments of the present application, the first inner gear is fixedly installed on the middle box, and the second inner gear is fixedly installed between the middle box and the lower box.

[0015] According to some preferred embodiments of the present application, an indicating mechanism is included, which comprises an indicating board, a mark arranged on the indicating board, a pointer and an indicating rod for driving the pointer to rotate, the upper end of the indicating rod being connected with the pointer, and the lower end of the indicating rod extending downward to be connected with the second hub. The indicating board is connected on the interface.

[0016] According to some preferred embodiments of the present application, the top cover is provided with a safety valve; and / or a pressure equalizer.

[0017] Due to the above technical solutions, compared with the prior art, the underwater ball valve gear box of the present application, through the design of double idler and double planetary gear structure, makes the output torque of the gear box three-stage amplified, realizes the function of operating large torque valve; at the same time, through the structure design between each component, makes the structure compact, helps to realize the use of modularization. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0019] Figure 1 is a perspective view of the underwater ball valve gear box of the preferred embodiment of the present application;

[0020] Figure 2 is a sectional view of the underwater ball valve gear box of the preferred embodiment of the present application;

[0021] Figure 3 is Figure 2 the sectional view of A-A;

[0022] Figure 4 is Figure 2 the sectional view of B-B;

[0023] Figure 5 is a perspective view of the first planetary gear mechanism in the preferred embodiment of the present application;

[0024] Figure 6 is a top view of the first planetary gear mechanism in the preferred embodiment of the present application;

[0025] Figure 7 is Figure 6 the sectional view of M-M;

[0026] Figure 8 is a perspective view of the second planetary gear mechanism in the preferred embodiment of the present application;

[0027] Figure 9 is a top view of the second planetary gear mechanism in the preferred embodiment of the present application;

[0028] Figure 10 is Figure 9 the sectional view of N-N;

[0029] In the attached diagram: 1. ROV interface, 2. Drive shaft, 3. Pressure cap, 4. First rolling bearing, 5. Second rolling bearing, 6. Upper housing, 7. Middle housing, 8. Pin, 9. Second internal gear, 10. Lower housing, 11. First bearing, 12. Second bearing, 13. Top cover, 14. Third rolling bearing, 15. Fourth rolling bearing, 16. Key, 17. First internal gear, 18. First planetary gear mechanism, 19. Second planetary gear mechanism, 20. Plug, 21. Idler gear, 22. Driving gear, 23. Driven gear, 24. Limit cap, 25. Limit rod, 26. Indicator rod, 27. Safety valve, 28. Third screw, 29. Pressure balancer, 30. Stop, 31. Connecting rod. 32. Indicator plate; 33. Limiting block; 34. Connecting groove; 35. Marker; 36. Pointer; 181. First sun gear; 182. First planetary carrier; 183. First screw; 184. First fixed shaft; 185. First hub; 186. First planetary bearing; 187. First planetary gear; 188. First washer; 189. First cylindrical roller bearing; 1810. First planetary shaft; 191. Second sun gear; 192. Second planetary carrier; 193. Second screw; 194. Second fixed shaft; 195. Second hub; 196. Second planetary bearing; 197. Second planetary gear; 198. Second washer; 199. Second cylindrical roller bearing; 1910. Second planetary shaft. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] like Figures 1-10 As shown, the underwater ball valve gearbox of this embodiment includes a drive connection mechanism, an indicating mechanism, an upper housing 6, a middle housing 7, a lower housing 10, a top cover 13, a first planetary gear mechanism 18 disposed between the upper housing 6 and the middle housing 7, a second planetary gear mechanism 19 disposed between the middle housing 7 and the lower housing 10, and a double idler gear mechanism disposed between the top cover 13 and the upper housing 6. A drain port is provided on the side of the lower housing 10 for self-draining or lubrication replacement. The plug 20 at the drain port is made of corrosion-resistant alloy material to prevent seawater corrosion.

[0032] In this embodiment, double pressure protection design is adopted, safety valve 27 and pressure balancer 29 are designed on the top cover 13, the pressure balancer 29 can be open or closed, the lubricating oil density used in the gear box is greater than that of seawater, and the floating of the lubricating oil and seawater interface in the pressure balancer 29 can balance the pressure of the lubricating oil in the gear box and the seawater outside. Moreover, the designed safety valve 27 can be self-drained at a certain pressure, which can prevent the pressure balancer 29 from failing when the pressure in the gear box exceeds the effective range of the pressure balancer 29, thereby more reliably ensuring the long-term normal operation of the gear box.

[0033] As shown in Figure 2 and 3 , the double idler mechanism includes a driving wheel 22, a first idler 21, a second idler 21, a driven wheel 23, and a driving shaft 2 for driving the driving wheel 22 to rotate, the driving wheel 22 is sleeved on the driving shaft 2 and is connected by a key to rotate synchronously. The first idler 21 and the second idler 21 are engaged with the driving wheel 22 and the driven wheel 23. The driving connection mechanism includes an interface 1 and a connecting rod 31, the upper end of the connecting rod 31 penetrates into the interface 1, and the lower end of the connecting rod 31 is connected with the upper end of the driving shaft 2. The interface 1 is an ROV interface 1; at the same time, the connecting rod 31 and its length are selected or designed according to actual conditions to meet the requirements of ROV operation under different working conditions.

[0034] The upper part of the first planetary gear mechanism 18 is connected with the driven wheel 23, the lower part of the first planetary gear mechanism 18 is connected with the upper part of the second planetary gear mechanism 19, and the lower part of the second planetary gear mechanism 19 is used to connect with the top of the valve stem of the underwater ball valve. The first planetary gear mechanism 18 and the second planetary gear mechanism 19 in this embodiment each include an internal gear, a sun gear, a plurality of planetary gears and planetary shafts uniformly distributed between the internal gear and the sun gear, a planet carrier, a wheel hub, a fixed shaft and a screw connecting the planet carrier and the wheel hub, etc. Through such a planetary gear mechanism, not only can the torque be effectively amplified, but also the modular structure design can be easily realized.

[0035] Specifically, as shown in Figure 2 , 5 -7, the first planetary gear mechanism 18 in this embodiment includes a first internal gear 17, a first sun gear 181, and four first planetary gears 187 uniformly distributed between the first internal gear 17 and the first sun gear 181, a first planet carrier 182 and a first wheel hub 185 arranged above and below the first planetary gears 187 respectively, the first wheel hub 185 is connected with the upper part of the second planetary gear mechanism 19, and the top of the first sun gear 181 is connected with the bottom of the driven wheel 23 through a key 16. The four first planetary gears 187 are symmetrically distributed, and they are engaged with the inner wall of the first internal gear 17.

[0036] The first ring gear 17 is fixedly installed on the middle box body 7 through the pin 8, and the upper box body 6, the first ring gear 17 and the middle box body 7 are connected in an embedded mode through the third screw 28, so that the space volume of the box body is reduced in design, the structure is more compact, and the cost of parts is reduced. The first planet carrier 182 and the first hub 185 are connected through the first screw 183 and the first fixed shaft 184, and the first planet wheel 187 is rotatably connected between the first planet carrier 182 and the first hub 185 through the first planet shaft 1810. In order to realize the rotation between the first planet wheel 187 and the first planet shaft 1810, the first washer 188 is arranged between the first planet wheel 187 and the first planet shaft 1810, and two first cylindrical roller bearings 189 are arranged above and below the first washer 188, and a first planet bearing 186 is further arranged below the lower first cylindrical roller bearing 189. The first planet bearing 186 is a self-lubricating bearing, which is arranged between the lower end of the first planet wheel 187 and the first planet shaft 1810. The cylindrical roller bearing is used to reduce the friction between the shaft and the gear, and the self-lubricating bearing is used to not only reduce the friction but also isolate the direct contact between the gear and the hub.

[0037] As Figure 2 、 8 As shown in FIG. 10, the second planetary gear mechanism 19 in the embodiment includes a second ring gear 9, a second sun wheel 191, four second planet wheels 197 uniformly distributed between the second ring gear 9 and the second sun wheel 191, a second planet carrier 192 and a second hub 195 covering above and below the second planet wheel 197 respectively, and the top of the second sun wheel 191 is connected with the first hub 185 through a key. The four second planet wheels 197 are symmetrically distributed, and are engaged with the inner wall of the second ring gear 9. The second hub 195 is provided with a connecting groove 34, and the valve rod of the underwater ball valve is connected in the connecting groove 34 to realize synchronous rotation. The second ring gear 9 is fixedly installed between the middle box body 7 and the lower box body 10 through the pin 8.

[0038] The second planet carrier 192 and the second wheel hub 195 are connected by the second screw 193 and the second fixed shaft 194, and the second planet wheel 197 is rotatably connected between the second planet carrier 192 and the second wheel hub 195 by the second planet shaft 1910. The top of the second planet carrier 192 is inserted into the groove of the first wheel hub 185 and connected and synchronously moved between the two planetary gear mechanisms by the key. In order to realize the rotation between the second planet wheel 197 and the second planet shaft 1910, the second washer 198 is arranged between the second planet wheel 197 and the second planet shaft 1910, and two second cylindrical roller bearings 199 are arranged above and below the second washer 198, and a second planet bearing 196 is further arranged below the lower second cylindrical roller bearing 199, the second planet bearing 196 is a self-lubricating bearing, arranged between the lower end of the second planet wheel 197 and the bottom end of the second planet shaft 1910.

[0039] The driving wheel 22, the driven wheel 23, the first planetary gear mechanism 18, the second planetary gear mechanism 19 and the box body in the embodiment are supported and connected by rolling bearings (the first rolling bearing 4, the second rolling bearing 5, the third rolling bearing 14, the fourth rolling bearing 15 and the like), which can reduce friction and have excellent load capacity and stability. The support connection between the second wheel hub 195 of the output end and the lower box body 10 adopts metal sliding bearings (the first bearing 11, the second bearing 12 and the like), which have excellent lubricity and greater axial and radial bidirectional load capacity.

[0040] As shown in Figure 2 , 4 and 8, the second wheel hub 195 in the embodiment is provided with a limiting block 33, the limiting block 33 is integrally formed with the second wheel hub 195, the lower box body 10 is provided with a stop block 30 matched with the limiting block 33, and the lower box body 10 is further provided with a limiting rod 25 penetrating the stop block 30 and a limiting cap 24. The limiting cap 24 is arranged at the end of the limiting rod 25 and plays a sealing role to prevent lubricating oil from leaking, the limiting rod has a square head and can be directly screwed to adjust its position like a bolt. The two stop blocks 30 are symmetrically arranged, the stop block 30 is arranged in a (isosceles) triangular shape or a (isosceles) trapezoidal shape, the side of the cross section of the stop block 30 forms an angle of 45° with the horizontal plane, and is used to control the rotation of the limiting block 33 between -45° and +45°, as shown in Figure 4 . Meanwhile, the limiting rod 25 and the limiting cap 24 are arranged corresponding to the two stop blocks 30, the position of the end of the limiting rod 25 is adjusted by the limiting cap 24 to control the rotation of the limiting block 33, and then the rotation angle of the second wheel hub 195 and the valve connected with the second planetary gear mechanism 19 is controlled.

[0041] As shown in Figure 1 and 2As shown, the indication mechanism in the embodiment includes an indication plate 32 connected to the interface 1, a switch mark 35 and a pointer 36 arranged on the indication plate 32, and an indication rod 26 for driving the pointer 36 to rotate, the upper end of the indication rod 26 is connected with the pointer 36, and the lower end of the indication rod 26 extends downward to be connected with the second hub 195. As shown, Figure 2 As shown, the indication rod 26 penetrates the driven wheel 23, the first sun gear 181, the first hub 185 and the second sun gear 191 in sequence, and the lower end thereof is fixedly connected with the second hub 195, so that the indication rod 26 and the pointer 36 are fixedly rotated with the second hub 195, and then accurate indication is achieved. That is, the indication rod 26 in the embodiment is connected with the second hub 195 in the form of mechanical fitting; since the second hub 195 is directly connected with the valve stem, such connection structure is helpful for directly representing the valve position, and compared with the cumulative error caused by multi-stage transmission, the design of the indication mechanism in the embodiment can more accurately represent the actual position state of the valve.

[0042] In the embodiment, at least the drive shaft 2, the indication rod 26 and the second hub 195 are made of seawater corrosion-resistant alloy material, and the gear box and the valve are integrally connected with a cathodic protection system, so as to ensure the corrosion resistance and operability of the valve.

[0043] The underwater ball valve gear box in the embodiment realizes one-stage increase of torque through the double-idler structure, realizes two-stage increase of torque through the first planetary gear mechanism 18, and realizes three-stage increase of torque through the second planetary gear mechanism 19.

[0044] Specifically, the double-idler transmission mechanism is designed in the first-stage reduction structure, the transmission direction of the driving wheel 22 and the driven wheel 23 is kept consistent through the idler 21, the double-idler 21 transmission has better continuity and stability compared with the single-idler 21 transmission, and can bear twice driving force of the single gear, which is helpful for compact design of the underwater gear box.

[0045] In the second-stage reduction structure, the design of the first planetary gear mechanism 18 meets the strength requirement of the gear transmission structure. The first planetary bearing 186 between the first planetary gear 187 and the first hub 185 is a self-lubricating bearing, which can reduce friction and wear and operation resistance between them. The first fixed shaft 184 is used to fixedly support between the first planetary carrier 182 and the first hub 185, which reduces the machining cost and difficulty compared with the integral planetary carrier.

[0046] In the third-stage reduction structure, the structure design of the second planetary gear mechanism 19 is similar to that of the first planetary gear mechanism 18, but has larger size and strength to bear large torque of the output end. The size of the second hub 195 shaft slot (connection slot 34) is designed to be connectable with the underwater ball valve with specified connection size requirement.

[0047] In order to better limit the rotation angle of the valve, a limiting block 33 is arranged on the second hub 195 in this embodiment, and a 90° limiting groove is formed by the stop block 30 in the lower box body 10, so that when the input torque of the ROV interface 1 is operated, the movement angle of the gear box output is limited to 0-90° (-45°-+45°), and the switch indication is transmitted to the top of the gear box through the indicating rod 26, so as to realize the 90° rotary switch operation of the ball valve. In addition, the limiting rod 25 installed on the lower box body 10 adopts a non-standard outer hexagonal screw thread form, which is adjusted by rotating the distance against the limiting block 33 of the second hub 195, so that the correspondence of the gear box switch operation and the switch indication can be accurately adjusted. The limiting rod 25 and the lower box body 10 are sealed by O-rings, and the outer end is additionally provided with a limiting cap 24 for protection. The limiting cap 24 is made of corrosion-resistant alloy material and is sealed with the lower box body 10 by O-rings, which can effectively prevent seawater corrosion.

[0048] The following briefly describes the installation method of the underwater ball valve gear box in this embodiment:

[0049] 1. Installation method of the first planetary gear mechanism 18

[0050] Referring to Figure 2 and Figures 5-7 , first place the first hub 185 flat, then place the four first planetary bearings 186 and the first planetary gear 187 above the four hole grooves of the first hub 185 respectively, then install a first cylindrical roller bearing 189 at one end of each of the four first planetary shafts 1810, and then align the hole grooves of the first hub 185, and then install the first washer 188 and another first cylindrical roller bearing 189 in sequence. Finally, align the four through holes of the first planet carrier 182 with the four first planetary shafts 1810, and install the first fixed shaft 184 from below the first hub 185, and connect them through the first screw 183, to complete the installation of the first planetary gear mechanism 18.

[0051] 2. The installation method of the second planetary gear mechanism 19 is the same as that of the first planetary gear mechanism 18, which will not be repeated here.

[0052] 3. Gear box installation method: (as shown in Figure 2 , from bottom to top)

[0053] (1) First, the lower housing 10 is laid flat, and the second bearing 12, the first bearing 11, the second inner gear 9, the pin 8, and the O-ring (at the connecting section of the second inner gear 9 and the lower housing 10 and the middle housing 7) are installed in the corresponding holes and grooves of the lower housing 10. A lifting ring is installed in the threaded process hole at the top of the second planetary gear mechanism 19, the second planetary gear mechanism 19 is hoisted and aligned with the second inner gear 9 and the first bearing 11 by rotating adjustment, and then the lifting ring is removed.

[0054] (2) The fourth rolling bearing 15 is installed in the hole and groove at the top of the second planetary gear mechanism 19, the double key 16 is installed in the key groove of the second sun gear 191, and then the middle housing 7 is installed and positioned and fixedly connected with the second inner gear 9 through the pin 8 and the screw. Then the pin 8 is installed on the middle housing 7, and the first planetary gear mechanism 18 is installed in the same way as the second planetary gear mechanism 19.

[0055] (3) The double key 16 is installed on the first sun gear 181, and then the fourth rolling bearing 15 is installed in the lower end hole and groove of the upper housing 6, and the upper housing 6 is positioned and fixedly connected with the middle housing 7 through the pin 8 and the third screw 28. After the second rolling bearing 5 and the third rolling bearing 14 are installed on the upper housing 6, the driven wheel 23 is installed first, and then the driving wheel 22 and the driving shaft 2 are installed in sequence and connected by the double key. After the first rolling bearing 4 and the third rolling bearing 14 are installed at the lower end of the top cover 13, the top cover 13 is installed, and finally the gland 3, the indicator rod 26, and the related sealing elements are installed, and the top cover 13 and the upper housing 6 are connected by screws.

[0056] (4) The top of the gear box can be configured with a closed pressure equalizer 29 commonly used for underwater valve, and an extension device with an ROV interface 1 and a switch indication panel.

[0057] The following briefly describes the working process of the underwater ball valve gear box in this embodiment:

[0058] The input torque applied at the ROV interface 1 is transmitted to the drive shaft 2, which is transmitted to the driving wheel 22 through the key, and the driving wheel 22 transmits the torque to the driven wheel 23 through the gear engagement with the idler wheel 21 and the driven wheel 23, at this time, the torque of the driven wheel 23 is increased by one stage; the driven wheel 23 transmits the torque to the first sun gear 181 of the first planetary gear mechanism 18 through the key 16, and the first sun gear 181 transmits the torque to the first hub 185 through the gear engagement with the first planetary gear 187 and the first internal gear 17, and the torque is amplified by two stages; the first hub 185 transmits the torque to the second sun gear 191 of the second planetary gear mechanism 19 through the key 16, and the second sun gear 191 transmits the torque to the second hub 195 through the gear engagement with the second planetary gear 197 and the second internal gear 9, and the torque is amplified by three stages, finally, the output torque of the gear box is amplified by three stages, realizing the function of operating the large torque valve.

[0059] The underwater ball valve gear box in the embodiment is a three-stage reduction structure (one stage is double-idler gear transmission, and the second and third stages are planetary gear transmission), the first stage is reduced through the speed ratio of the driving wheel 22 and the driven wheel 23, the second stage is reduced through the first planetary gear mechanism 18 (including the first internal gear 17), and the third stage is reduced through the second planetary gear mechanism 19 (including the second internal gear 9). The required speed ratio is obtained through three-stage reduction, so that a larger output torque can be obtained when the input torque is smaller, thereby meeting the design requirements of the valve. At the same time, the design considers the characteristics of modular design, each stage of transmission can be connected with the underwater ball valve with specified torque and connection size requirements through the adaptive lower connection size, which is helpful to realize the use of modularization. For example, the gear box combined with different numbers of planetary gear mechanism modules is applied to the valve with corresponding torque requirements, and the accuracy of the valve indication is not affected.

[0060] The above embodiments are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A ball valve gear box characterized by: The gear box comprises a top cover, an upper box body, a middle box body, a lower box body, a double-idler mechanism arranged between the top cover and the upper box body, a first planetary gear mechanism arranged between the upper box body and the middle box body, and a second planetary gear mechanism arranged between the middle box body and the lower box body. The double-idler mechanism comprises a driving wheel, a first idler, a second idler, a driven wheel, and a driving shaft for driving the driving wheel to rotate. The first planetary gear mechanism comprises a first inner gear, a first sun gear, and a plurality of first planet gears distributed between the first inner gear and the first sun gear. The first planetary gear mechanism comprises a first planet carrier and a first hub arranged above and below the first planet gears respectively. The second planetary gear mechanism comprises a second inner gear, a second sun gear, and a plurality of second planet gears distributed between the second inner gear and the second sun gear. The second planetary gear mechanism comprises a second planet carrier and a second hub arranged above and below the second planet gears respectively. The second hub is provided with a connecting groove, and the top of the valve rod of the underwater ball valve is connected in the connecting groove. The second hub is provided with a limiting block, and the lower box body is provided with a stop block matched with the limiting block. The first inner gear is fixedly installed on the middle box body, and the second inner gear is fixedly installed between the middle box body and the lower box body.

2. The ball valve gear box of claim 1, wherein: The top cover is provided with a safety valve and a pressure equalizer. The gear box adopts lubricating oil with a density greater than seawater. The driving wheel, the first idler, the second idler, and the driven wheel are located on the same horizontal plane. The driving connection mechanism comprises an interface and a connecting rod. The upper end of the connecting rod penetrates into the interface, and the lower end of the connecting rod is connected with the upper end of the driving shaft.

3. The ball valve gear box of claim 1, wherein: The indicating mechanism comprises an indicating plate, a mark arranged on the indicating plate, a pointer and an indicating rod for driving the pointer to rotate, the upper end of the indicating rod is connected with the pointer, and the lower end of the indicating rod extends downward to be connected with the second hub.

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