Underwater gear box

Abstract

The application relates to the technical field of transmission devices, in particular to an underwater gearbox. The underwater gearbox comprises a power input mechanism, a power switching mechanism, a power output mechanism, a pressure balance mechanism and a discharge mechanism. The input end of the power input mechanism can be connected with the output end of an underwater robot and transmit torque. The power switching mechanism comprises a bevel gear, the bevel gear is connected with the output end of the power input mechanism and transmits torque. The power output mechanism has a worm gear structure, the input end of the worm gear structure is fixed with the bevel gear, the bevel gear is configured to change the power transmission direction of the power input mechanism, the output end of the worm gear structure is connected with the input end of an underwater valve and transmits torque. The pressure balance mechanism is sealedly connected with the power output mechanism, the pressure balance mechanism can balance the internal and external pressures of the underwater gearbox, and the discharge mechanism can be turned on when the internal pressure of the underwater gearbox reaches a preset value to connect the outside with the inside of the underwater gearbox.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission devices, in particular to an underwater gearbox. BACKGROUND

[0002] With the exploration of marine oil and gas resources, the marine oil and gas resources have been proven to be rich, so the development of marine oil and gas resources has become a new focus and growth point of the oil and gas industry. Compared with the development of land oil and gas resources, the development of marine oil and gas resources is more difficult, and underwater valves are the most important in various marine oil and gas resource development. Underwater valves (flat gate valves, ball valves, etc.) are widely used in underwater Christmas trees, underwater gathering and transportation manifolds, marine pipelines and other gas and liquid medium exploitation and pipeline systems due to their small flow resistance, reliable sealing and long service life.

[0003] In related technologies, deep water operation equipment can only control the opening and closing of various underwater valves through remote operation or underwater robots (ROV, Remote Operated Underwater Vehicle), and the underwater valves can be controlled on the drilling platform or land. Specifically, a gearbox is arranged at the underwater valve, and a gearbox with a planetary gear train is used to connect the underwater robot and the valve respectively, so that the output power of the underwater robot is transmitted to the valve to realize normal driving of the valve. However, with the development of deep sea oil and gas fields and the increasing demand for large aperture and high pressure valves, the torque required to open or close the valve is getting larger and larger. In order to meet the actual demand, the output torque of the gearbox needs to be increased continuously, resulting in a too large size of the gearbox, which cannot meet the actual installation space requirement.

[0004] Therefore, it is urgent to invent an underwater gearbox to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide an underwater gearbox to reduce the size of the underwater gearbox while improving the transmission torque of the underwater gearbox, and to meet the transmission and installation requirements.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The underwater gearbox can transmit the power output by the underwater robot to the underwater valve, and the underwater gearbox comprises:

[0008] A power input mechanism, the input end of the power input mechanism can be connected to the output end of the underwater robot and transmit torque;

[0009] A power switching mechanism, the power switching mechanism comprises a bevel gear, the bevel gear is connected to the output end of the power input mechanism and transmits torque;

[0010] a power output mechanism having a worm gear structure, an input end of the worm gear structure being fixed with the bevel gear, the bevel gear being configured to change the power transmission direction of the power input mechanism, an output end of the worm gear structure being in interface and transmission torque with an input end of the underwater valve;

[0011] a pressure balance mechanism in sealed interface with the power output mechanism, the pressure balance mechanism being capable of balancing the internal and external pressure of the underwater gearbox; and

[0012] a relief mechanism capable of conducting the outside and the inside of the underwater gearbox when the internal pressure of the underwater gearbox reaches a preset value.

[0013] As an option, the power input mechanism comprises:

[0014] an ROV interface having a first interface cavity for accommodating an output end of the underwater robot;

[0015] a conversion box having a second interface cavity for accommodating an input end of the power conversion mechanism;

[0016] an ROV conversion flange configured to fixedly connect the ROV interface and the conversion box;

[0017] an input shaft, an end of the input shaft along an axial direction being provided with a rectangular portion, the other end of the input shaft along the axial direction having a bevel gear portion, the rectangular portion being located in the first interface cavity and capable of engaging with the output end of the underwater robot, the bevel gear portion being located in the second interface cavity and capable of engaging with the bevel gear.

[0018] As an option, the power input mechanism further comprises:

[0019] a blocking piece, the second interface cavity being filled with lubricating oil, a cavity wall of the second interface cavity being provided with an oil hole in communication with the outside, the blocking piece being configured to block the oil hole.

[0020] As an option, the power conversion mechanism comprises:

[0021] a fixed flange fixedly connected with the conversion box, the fixed flange being used for positioning the bevel gear along the axial direction of the input end of the worm gear structure; and

[0022] a coupling flange, the power output mechanism having a drive box, the output end of the worm gear structure being located in the drive box and the input end of the worm gear structure extending out of the drive box, the coupling flange being used for fixedly connecting the fixed flange and the drive box.

[0023] As an option, the pressure balancing mechanism comprises:

[0024] An adapter, which is sealedly connected with the power output mechanism;

[0025] A matching piece, which is installed on the adapter, the adapter is provided with a through hole, the matching piece is provided with a balancing channel, the balancing channel, the through hole and the internal space of the power output mechanism are sequentially communicated;

[0026] A deformation capsule and a supporting piece, the supporting piece supports the deformation capsule, the deformation capsule has elasticity, the supporting piece blocks the balancing channel, external water can enter the deformation capsule through the opening of the deformation capsule and drive the deformation capsule to expand downward, and the supporting piece can move along the balancing channel.

[0027] As an option, the pressure balancing mechanism further comprises:

[0028] A filter, which is arranged at the opening of the deformation capsule, and is used for filtering external water entering the deformation capsule.

[0029] As an option, the pressure balancing mechanism further comprises:

[0030] A limiting bottle, which extends in the up-down direction, the deformation capsule is located in the limiting bottle, and the limiting bottle can provide guidance for deformation of the deformation capsule.

[0031] As an option, the pressure balancing mechanism further comprises:

[0032] A relief valve, a relief hole is arranged on the power output mechanism, the relief hole communicates the inside and outside of the underwater gear box, and the relief valve is installed in the relief hole.

[0033] As an option, the underwater gear box further comprises:

[0034] An indicating mechanism, which comprises a first indicating assembly and a second indicating assembly, the first indicating assembly is sealedly connected with the power input mechanism and is in meshing transmission, the second indicating assembly is sealedly connected with the power output mechanism and is in meshing transmission, and the first indicating assembly and the second indicating assembly are both used for indicating the opening degree of the underwater valve.

[0035] As an option, the first indicating assembly comprises:

[0036] A gear set, an input end of the gear set is sealedly connected with the power input mechanism and is in meshing transmission;

[0037] A first driving shaft, an output end of the gear set is fixedly connected with the first driving shaft, and the gear set can drive the first driving shaft to rotate around an axial direction of the first driving shaft;

[0038] A first pointer, which is fixedly connected with the first driving shaft; and

[0039] A first mark and a second mark, the first mark and the second mark are arranged at intervals around the axial direction of the first driving shaft, the first pointer rotates between the first mark and the second mark, and the position of any one of the first mark and the second mark indicates that the underwater valve is opened, and the position of the other one indicates that the underwater valve is closed.

[0040] The present application has the following advantages:

[0041] The underwater gearbox provided by the present application realizes the effect of transmitting the power output by the output end of the underwater robot to the input end of the underwater valve by the following steps: connecting the input end of the power input mechanism with the output end of the underwater robot and transmitting the torque, connecting the output end of the power input mechanism with the bevel gear in the power transmission mechanism and transmitting the torque, fixing the bevel gear with the input end of the worm gear structure in the power output mechanism, and connecting the output end of the worm gear structure in the power output mechanism with the input end of the underwater valve and transmitting the torque. Moreover, the maximum torque that can be transmitted by the underwater gearbox is improved by connecting and meshing the worm gear structure in the power output mechanism with the input end of the underwater valve, the actual power transmission demand is met, the power input mechanism, the power transmission mechanism and the power output mechanism are integrated together by changing the transmission direction of the power transmitted by the power input mechanism through the bevel gear in the power transmission mechanism, the underwater ball valve demand torque design is met, the overall size of the underwater gearbox is greatly reduced, and the actual installation demand is met. In addition, the pressure balancing mechanism is arranged in sealing connection with the power output mechanism, the internal and external pressures of the underwater gearbox are balanced by the pressure balancing mechanism, and the relief mechanism is arranged to be conducted to the outside and the underwater gearbox when the internal pressure of the underwater gearbox reaches a preset value. If the pressure balancing mechanism fails, the internal pressure of the gearbox body can be discharged through the relief mechanism to realize automatic pressure relief and balance the internal and external pressures, avoid the one-way continuous pressure bearing of the underwater gearbox, meet the actual power transmission demand, ensure the normal work of the underwater gearbox under water, and improve the service life. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a first structure schematic view of the underwater gearbox provided by the embodiment of the present application;

[0043] Figure 2 is a second structure schematic view of the underwater gearbox provided by the embodiment of the present application;

[0044] Figure 3 is an explosion schematic view of the underwater gearbox provided by an embodiment of the present application;

[0045] Figure 4 is a cross-sectional view along a vertical plane of the underwater gearbox provided by an embodiment of the present application;

[0046] Figure 5 is a cross-sectional view along a horizontal plane of the underwater gearbox provided by an embodiment of the present application.

[0047] In the drawings:

[0048] 100, power input mechanism; 110, ROV interface; 120, ROV adapter flange; 130, input shaft; 131, rectangular portion; 132, bevel gear portion; 140, conversion box; 141, oil hole; 150, plugging member; 160, rolling bearing;

[0049] 200, power adapter mechanism; 210, bevel gear; 220, fixed flange; 230, coupling flange; 240, thrust bearing;

[0050] 300, power output mechanism; 310, worm gear structure; 311, worm; 312, worm gear; 320, drive box; 321, box body; 322, cover plate; 330, limiting structure; 331, limiting bolt; 332, sealing cap;

[0051] 400, indicating mechanism; 410, first indicating assembly; 411, first pointer; 412, first mark; 413, second mark; 414, first drive shaft; 415, second protective cover; 416, adapter plate; 417, gear set; 420, second indicating assembly;

[0052] 500, pressure balancing mechanism; 510, deformation capsule; 520, supporting member; 530, matching member; 540, adapter member; 550, filtering member; 560, first protective cover; 570, limiting bottle;

[0053] 600, fastener;

[0054] 700, sealing ring;

[0055] 800, positioning pin;

[0056] 900, relief mechanism. DETAILED DESCRIPTION

[0057] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments.

[0058] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0060] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.

[0061] The underwater valve is widely used in underwater Christmas tree, underwater gathering manifold, marine pipeline and other gas and liquid medium exploitation and pipeline system. Since the deep water operation equipment can only control the opening and closing of various underwater valves through remote operation or underwater robot, the control of underwater valve can be realized on the drilling platform or land. Specifically, a gear box is arranged at the underwater valve, and the gear box with planetary gear train is used to respectively connect the underwater robot and the valve, so that the output power of the underwater robot is transmitted to the valve to realize the normal driving of the valve. However, with the development of deep sea oil and gas field and the increasing demand for large aperture and high pressure valve, the torque required for opening or closing the valve is getting larger and larger. In order to meet the actual demand, the output torque of the gear box needs to be increased continuously, resulting in that the size of the gear box is too large, which cannot meet the actual installation space requirement.

[0062] In order to solve the above problems, such as Figures 1-5As shown, the embodiment provides an underwater gearbox to transmit power output by an underwater robot to an underwater valve. The underwater gearbox comprises a power input mechanism 100, a power transfer mechanism 200, a power output mechanism 300, a pressure balance mechanism 500 and a relief mechanism 900, wherein the input end of the power input mechanism 100 is capable of being connected to the output end of the underwater robot and transmitting torque, the power transfer mechanism 200 comprises a bevel gear 210, the bevel gear 210 is connected to the output end of the power input mechanism 100 and transmits torque, the power output mechanism 300 has a worm gear structure 310, the input end of the worm gear structure 310 is fixed with the bevel gear 210, the bevel gear 210 is configured to change the power transmission direction of the power input mechanism 100, the output end of the worm gear structure 310 is sealingly connected to the input end of the underwater valve and engages in transmission, the pressure balance mechanism 500 is sealingly connected to the power output mechanism 300, the pressure balance mechanism 500 is capable of balancing the internal and external pressures of the power output mechanism 300, and the relief mechanism 900 is capable of conducting the outside to the inside of the underwater gearbox when the internal pressure of the underwater gearbox reaches a preset value.

[0063] The underwater gearbox realizes the effect of transmitting the power output by the output end of the underwater robot to the input end of the underwater valve by butting and transmitting torque between the input end of the power input mechanism 100 and the output end of the underwater robot, butting and transmitting torque between the output end of the power input mechanism 100 and the bevel gear 210 in the power switching mechanism 200, fixing the bevel gear 210 and the input end of the worm and gear structure 310 in the power output mechanism 300, and butting and transmitting torque between the output end of the worm and gear structure 310 in the power output mechanism 300 and the input end of the underwater valve, and the maximum torque that can be transmitted by the underwater gearbox is improved by butting and meshing transmission between the worm and gear structure 310 in the power output mechanism 300 and the input end of the underwater valve, meeting the actual power transmission demand, and the power input mechanism 100, the power switching mechanism 200 and the power output mechanism 300 can be integrated together by changing the transmission direction of the power transmitted by the power input mechanism 100 through the bevel gear 210 in the power switching mechanism 200, which not only can meet the design of wide torque demand of the underwater ball valve, but also can greatly reduce the overall size of the underwater gearbox, meeting the actual installation demand. In addition, by setting the pressure balancing mechanism 500 sealed with the power output mechanism 300, the internal and external pressures of the power output mechanism 300 are balanced by the pressure balancing mechanism 500, and the relief mechanism 900 is set to conduct the outside and the underwater gearbox when the pressure in the underwater gearbox reaches the preset value, if the pressure balancing mechanism 500 fails, the pressure in the gearbox body can be discharged to realize automatic pressure relief and balance the internal and external pressures through the relief mechanism 900, avoiding the one-way continuous pressure bearing of the underwater gearbox to meet the actual power transmission demand, while ensuring the normal work of the underwater gearbox under water and improving the service life.

[0064] It should be noted that in the present embodiment, the worm and gear structure 310 includes a worm 311 and a worm wheel 312 that mesh with each other, wherein the worm 311 is fixed with the bevel gear 210, and the worm wheel 312 is butted and meshed with the input end of the underwater valve.

[0065] In the present embodiment, the underwater gearbox further comprises a positioning pin 800, a fastener 600, a sealing ring 700, the power input mechanism 100, the power switching mechanism 200, the power output mechanism 300 and the pressure balancing mechanism 500 are all positioned by the positioning pin 800, fixed by the fastener 600, and sealed by the sealing ring 700. It should be noted that in the present embodiment, the fastener 600 is a bolt, and the sealing ring 700 is a rubber ring.

[0066] As an alternative, the power input mechanism 100 comprises an ROV interface 110, a conversion box 140, an ROV adapter flange 120 and an input shaft 130, wherein the ROV interface 110 has a first docking cavity for accommodating an output end of the underwater robot, the conversion box 140 has a second docking cavity for accommodating an input end of the power adapter mechanism 200, the ROV adapter flange 120 is configured to fixedly connect the ROV interface 110 and the conversion box 140, the input shaft 130 is provided with a rectangular portion 131 at one end along the axial direction, and the input shaft 130 has a bevel gear portion 132 at the other end along the axial direction, the rectangular portion 131 is located in the first docking cavity and can be engaged with the output end of the underwater robot, and the bevel gear portion 132 is located in the second docking cavity and can be engaged with the input end of the power adapter mechanism 200.

[0067] By using the ROV adapter flange 120 to fixedly connect the ROV interface 110 and the conversion box 140, the rectangular portion 131 and the bevel gear portion 132 are arranged at both ends of the input shaft 130 along the axial direction, the rectangular portion 131 is arranged in the first docking cavity in the ROV interface 110, so that the output end of the underwater robot is engaged with the rectangular portion 131 in the first docking cavity, and the bevel gear portion 132 is arranged in the second docking cavity in the conversion box 140, so that the input end of the power adapter mechanism 200 is engaged with the bevel gear portion 132 in the second docking cavity. It should be noted that the ROV adapter flange 120 is positioned between the ROV interface 110 and the conversion box 140 by the positioning pin 800, fixed by the fastener 600 and sealed by the sealing ring 700.

[0068] To further improve the positioning accuracy of the input shaft 130 in the conversion box 140 and reduce the friction between the input shaft 130 and the conversion box 140, the power input mechanism 100 further comprises a rolling bearing 160, which is clamped between the input shaft 130 and the conversion box 140 to realize radial positioning of the input shaft 130 and reduce the friction between the input shaft 130 and the conversion box 140.

[0069] In actual operation, to improve the service life of the underwater gear box, the second docking cavity is filled with lubricating oil. To facilitate filling of the lubricating oil into the second docking cavity, the power input mechanism 100 further comprises a plugging member 150, the cavity wall of the second docking cavity is provided with an oil hole 141 in communication with the outside, and the plugging member 150 is configured to plug the oil hole 141.

[0070] In an alternative, the power switching mechanism 200 comprises a bevel gear 210, a fixing flange 220 and a coupling flange 230, wherein the bevel gear 210 is sleeved on the outer periphery of the worm 311, the bevel gear 210 is located in the second docking cavity, the fixing flange 220 is fixedly connected with the conversion box 140, the fixing flange 220 is used for positioning the bevel gear 210 along the axial direction of the worm 311, the power output mechanism 300 has a driving box 320, the worm 311 is located in the driving box 320 and the axial ends of the worm 311 extend out of the driving box 320, and the coupling flange 230 is used for fixedly connecting the fixing flange 220 and the driving box 320. By setting the bevel gear 210 in the second docking cavity, fixedly connecting the conversion box 140 by using the fixing flange 220, fixedly connecting the fixing flange 220 and the driving box 320 in the power output mechanism 300 by using the coupling flange 230, sleeving the bevel gear 210 on the outer periphery of the worm 311, and utilizing the meshing of the bevel gear 210 and the bevel gear part 132, the change of the direction of the power transmitted by the power switching mechanism 200 to the power input mechanism 100 is realized. It should be noted that in the embodiment, the power output direction of the output end of the underwater robot is rotation around a vertical axis, and through the meshing transmission of the bevel gear part 132 and the bevel gear 210, the worm 311 can be driven to rotate around a horizontal axis. In other embodiments, the power output direction of the output end of the underwater robot can be adjusted according to actual needs, and the assembly and meshing mode of the bevel gear part 132 and the bevel gear 210 can be adjusted adaptively to adjust the power output direction of the worm 311. In addition, in the embodiment, the fixing flange 220, the conversion box 140, the fixing flange 220, the coupling flange 230 and the coupling flange 230 and the driving box 320 are all positioned by the positioning pin 800, fixed by the fastener 600 and sealed by the sealing ring 700.

[0071] Similarly, in order to improve the transmission effect of the power switching mechanism 200, a thrust bearing 240 is arranged between the bevel gear 210 and the fixing flange 220. The thrust bearing 240 can stop and position the bevel gear 210 along the axial direction of the worm 311.

[0072] As an alternative, the pressure balancing mechanism 500 comprises an adapter 540, a fitting piece 530, a deformation capsule 510 and a supporting piece 520, wherein the adapter 540 is sealingly connected with the driving box 320, the fitting piece 530 is mounted on the adapter 540, the adapter 540 is provided with a through hole, the fitting piece 530 is provided with a balancing channel, the balancing channel, the through hole and the inner space of the driving box 320 are sequentially communicated, the supporting piece 520 supports the deformation capsule 510, the deformation capsule 510 is elastic, the supporting piece 520 blocks the balancing channel, external water can enter the deformation capsule 510 through the opening of the deformation capsule 510 and drive the deformation capsule 510 to expand downward, the supporting piece 520 can move along the balancing channel to change the volume of the driving box 320, and the change of the volume of the driving box 320 under the condition that the volume of the medium in the driving box 320 is unchanged can increase or decrease the pressure in the driving box 320, so that the internal pressure of the driving box 320 is equal to the external pressure. It should be noted that in the embodiment, the adapter 540, the driving box 320 and the fitting piece 530 are positioned by the positioning pin 800, fixed by the fastener 600 and sealed by the sealing ring 700.

[0073] Specifically, when the pressure of the external water increases, the external water will enter the deformation capsule 510 and drive the deformation capsule 510 to expand downward, thereby driving the supporting piece 520 supporting the deformation capsule 510 to move downward along the balancing channel. Since the supporting piece 520 seals the balancing channel, the through hole and the inner space of the driving box 320, the balancing channel, the through hole and the inner space of the driving box 320 are compressed during the downward movement of the supporting piece 520, thereby increasing the pressure of the balancing channel, the through hole and the inner space of the driving box 320, so that the pressure between the balancing channel, the through hole and the driving box 320 is equal to the pressure of the external water. When the pressure of the external water decreases, the deformation capsule 510 drives the water in the deformation capsule 510 to be discharged under the action of its own elasticity, and the deformation capsule 510 contracts upward. At this time, the supporting piece 520 supporting the deformation capsule 510 loses the downward driving force, and the closed space composed of the balancing channel, the through hole and the driving box 320 drives the supporting piece 520 to move upward along the balancing channel until the supporting piece 520 reabuts against the deformation capsule 510. At this time, the pressure of the external water is just equal to the internal pressure of the balancing channel, the through hole and the driving box 320.

[0074] To improve the deformation effect of the deformation capsule 510, the pressure balancing mechanism 500 further comprises a limiting bottle 570, the limiting bottle 570 extends in the up-down direction, the deformation capsule 510 is located in the limiting bottle 570, and the limiting bottle 570 can provide guidance for the deformation of the deformation capsule 510.

[0075] Due to the complex actual operation environment of the underwater gearbox, underwater animals or underwater sundries enter the deformation capsule 510 through the opening, and then affect the expansion and contraction of the deformation capsule 510. In order to ensure the normal use of the deformation capsule 510, the pressure balance mechanism 500 further comprises a filter 550, wherein the filter 550 is arranged at the opening of the deformation capsule 510, and the filter 550 is used for filtering the external water entering the deformation capsule 510.

[0076] In addition, in the embodiment, the pressure balance mechanism 500 further comprises a first protective cover 560, and the first protective cover 560 covers the outside of the limiting bottle 570, so as to further prevent animals or sundries from approaching the deformation capsule 510.

[0077] In order to further improve the use safety of the underwater gearbox, the relief mechanism 900 further comprises a relief valve, a relief hole is formed on the power output mechanism 300, the relief hole is communicated between the inside and the outside of the power output mechanism 300, and the relief valve is installed in the relief hole. When the pressure of the external water is too large or the deformation capsule 510 fails, the internal and external pressures of the driving box body 320 cannot be balanced through the deformation of the deformation capsule 510, and if the internal pressure of the underwater gearbox reaches a preset value, the relief valve is opened, and the inside and the outside of the driving box body 320 are communicated.

[0078] In order to further facilitate the observation of the transmission effect of the underwater gearbox, the underwater gearbox further comprises an indication mechanism 400, the indication mechanism 400 comprises a first indication assembly 410 and a second indication assembly 420, the first indication assembly 410 is in sealed butt joint and meshing transmission with the power input mechanism 100, the second indication assembly 420 is in sealed butt joint and meshing transmission with the power output mechanism 300, and the first indication assembly 410 and the second indication assembly 420 are both used for indicating the opening and closing degree of the underwater valve. By arranging the first indication assembly 410 and the second indication assembly 420 in the indication mechanism 400, the first indication assembly 410 is in sealed butt joint and meshing transmission with the power input mechanism 100, the second indication assembly 420 is in sealed butt joint and meshing transmission with the power output mechanism 300, the opening and closing degree of the underwater valve is indicated by the first indication assembly 410 and the second indication assembly 420 respectively, the tooling personnel can not only quickly determine the opening and closing degree of the underwater valve, but also can judge the transmission accuracy of the underwater gearbox by comparing the indication results of the first indication assembly 410 and the second indication assembly 420. If the indication deviation between the first indication assembly 410 and the second indication assembly 420 is within an acceptable range, it indicates that the internal structure of the underwater gearbox can work normally. If the indication deviation between the first indication assembly 410 and the second indication assembly 420 exceeds the acceptable range, it indicates that there is a problem in the internal structure of the underwater gearbox, and the underwater gearbox needs to be repaired. The specific value of the acceptable range can be adjusted according to actual needs, and the embodiment is not limited in particular.

[0079] In the embodiment, the first indication assembly 410 comprises a gear set 417, a first driving shaft 414, a first pointer 411, a first mark 412 and a second mark 413, wherein the input end of the gear set 417 is in meshing transmission with the input shaft 130 of the power input mechanism 100, the output end of the gear set 417 is fixedly connected with the first driving shaft 414, the gear set 417 can drive the first driving shaft 414 to rotate around the axial direction of the first driving shaft 414, the first pointer 411 is fixedly connected with the first driving shaft 414, the first mark 412 and the second mark 413 are arranged in the axial direction of the first driving shaft 414, the first pointer 411 rotates between the first mark 412 and the second mark 413, the position of any one of the first mark 412 and the second mark 413 indicates that the underwater valve is opened, and the position of the other one indicates that the underwater valve is closed. When the input shaft 130 of the underwater robot is rotated around the axial direction of the input shaft 130, the gear set 417 in meshing transmission with the input shaft 130 is followed to rotate, and then drives the first driving shaft 414 and the first pointer 411 to rotate around the axial direction of the first driving shaft 414, so as to realize the deflection effect of the first pointer 411 between the first mark 412 and the second mark 413, to indicate the opening degree of the underwater valve.

[0080] In order to improve the protection of the gear set 417, the first indication assembly 410 further comprises an adapter plate 416 and a second protective cover 415, the adapter plate 416 and the second protective cover 415 are buckled and fixed together, and the buckled adapter plate 416 and the second protective cover 415 are clamped between the ROV interface 110 and the ROV adapter flange 120, and the gear set 417 is located between the adapter plate 416 and the second protective cover 415. It should be noted that in the embodiment, the adapter plate 416 and the second protective cover 415 are positioned by the positioning pin 800, fixed by the fastener 600 and sealed by the sealing ring 700, and the buckled adapter plate 416 and the second protective cover 415 are also positioned by the positioning pin 800 and the ROV interface 110 and the ROV adapter flange 120, and fixed by the fastener 600 and the ROV interface 110 and the ROV adapter flange 120.

[0081] To further simplify the structure of the underwater gear box, in the embodiment, the drive box body 320 comprises a box body 321 and a cover plate 322 fixed together, the worm wheel 312 is accommodated in the box body 321, the second indicating assembly 420 only comprises a second drive shaft which is the same in structure as the first drive shaft 414, a second pointer which is the same in structure as the first pointer 411, a third mark and a fourth mark which are the same in structure as the first mark 412 and the second mark 413, the second drive shaft penetrates the cover plate 322 and is fixed coaxially with the worm wheel 312, the third mark and the fourth mark are fixed on the cover plate 322 and spaced apart in the axial direction of the second drive shaft, and the second pointer is fixed on the second drive shaft. When the worm 311 rotates in the axial direction of itself, the worm wheel 312 engaged with the worm 311 can be driven to rotate in the axial direction of itself, thereby driving the second drive shaft and the second pointer to deflect between the third mark and the fourth mark to indicate the opening degree of the underwater valve. It should be noted that in the embodiment, the box body 321 and the cover plate 322 are positioned by the positioning pin 800, fixed by the fastener 600 and sealed by the sealing ring 700.

[0082] In the embodiment, the worm wheel 312 is provided with an engagement groove at the center axis, and the engagement groove is engaged with the input end of the underwater valve. Since the second pointer can rotate around the center axis of the worm wheel 312 and deflect between the third mark and the fourth mark, the second pointer can accurately reflect the opening state of the underwater valve.

[0083] In addition, in the embodiment, the power output mechanism 300 further comprises two sets of limiting structures 330, which are respectively arranged on the side wall of the box body 321 and partially extend into the box body 321, and are used to limit the maximum rotation angle of the worm wheel 312.

[0084] Specifically, each set of limiting structures 330 comprises a limiting bolt 331 and a sealing cap 332. The side wall of the box body 321 is provided with two limiting through holes, the limiting bolts 331 in the two sets of limiting structures 330 respectively extend into the box body 321 along the limiting through holes, and the sealing caps 332 are respectively fixed with one end of the corresponding limiting bolts 331 outside the box body 321 and seal the limiting through holes by the sealing ring 700. The part of the limiting bolt 331 extending into the box body 321 can abut against the worm wheel 312 to prevent the worm wheel 312 from rotating in the axial direction of itself, thereby achieving the effect of limiting the maximum rotation angle of the worm wheel 312 by the two limiting bolts 331. It should be noted that in the embodiment, the worm wheel 312 can rotate arbitrarily within the range of 0-90°. In other embodiments, the maximum rotation angle of the worm wheel 312 can also be adjusted according to actual needs, and the embodiment is not limited in particular.

[0085] In order to further facilitate the understanding of the underwater gear box provided in the embodiment, the following will be described in combination withFigures 1-5 The specific working process of the underwater gearbox is described as follows:

[0086] 1) The output end of the underwater robot is inserted into the first docking cavity of the ROV interface 110 and is engaged with the rectangular part 131 on the input shaft 130, and the output end of the underwater robot drives the input shaft 130 to rotate around the axial direction of the input shaft 130;

[0087] 2) The bevel gear part 132 on the input shaft 130 is engaged with the bevel gear 210 in the power transfer mechanism 200 to drive the bevel gear 210 sleeved on the worm 311 to rotate around the axial direction of the worm 311;

[0088] 3) The worm gear 312 is engaged with the output end of the underwater valve to drive the underwater valve to open or close.

[0089] It should be noted that during the transmission process of the input shaft 130 in the underwater gearbox, the first pointer 411 deflects between the first mark 412 and the second mark 413, and the second pointer deflects between the third mark and the fourth mark to indicate the opening and closing degree of the underwater valve.

[0090] Obviously, the above embodiments of the present application are only examples for clear illustration of the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An underwater gear box capable of transmitting power outputted from an underwater robot to an underwater valve, characterized by, The underwater gearbox comprises: a power input mechanism (100), an input end of the power input mechanism (100) being capable of interfacing with and transmitting torque with an output end of the underwater robot; a power transfer mechanism (200), the power transfer mechanism (200) comprising a bevel gear (210), the bevel gear (210) being capable of interfacing with and transmitting torque with an output end of the power input mechanism (100); a power output mechanism (300), the power output mechanism (300) having a worm gear structure (310), an input end of the worm gear structure (310) being fixed with the bevel gear (210), the bevel gear (210) being configured to change the power transmission direction of the power input mechanism (100), an output end of the worm gear structure (310) being capable of interfacing with and transmitting torque with an input end of the underwater valve; a pressure balance mechanism (500), the pressure balance mechanism (500) being capable of balancing the internal and external pressure of the underwater gearbox; and a relief mechanism (900), capable of conducting the outside and the inside of the underwater gearbox when the internal pressure of the underwater gearbox reaches a preset value. The power input mechanism (100) comprises:

2. The underwater gear box of claim 1, wherein, an ROV interface (110) having a first interfacing cavity for accommodating the output end of the underwater robot; a conversion box body (140) having a second interfacing cavity for accommodating the input end of the power transfer mechanism (200); an ROV transfer flange (120) configured to fixedly connect the ROV interface (110) and the conversion box body (140); an input shaft (130), one end of the input shaft (130) being provided with a rectangular portion (131) along an axial direction, the other end of the input shaft (130) having a bevel gear portion (132) along the axial direction, the rectangular portion (131) being located in the first interfacing cavity and capable of engaging with the output end of the underwater robot, the bevel gear portion (132) being located in the second interfacing cavity and capable of engaging with the bevel gear (210). The power input mechanism (100) further comprises:

3. The underwater gear box of claim 2, wherein, a blocking piece (150), the second interfacing cavity being filled with lubricating oil, a cavity wall of the second interfacing cavity being provided with an oil hole (141) in communication with the outside, the blocking piece (150) being configured to block the oil hole (141). The power transfer mechanism (200) comprises:

4. The underwater gear box of claim 2, wherein, a fixed flange (220) fixedly connected with the conversion box body (140), the fixed flange (220) being used for positioning the bevel gear (210) along the axial direction of the input end of the worm gear structure (310); and a bevel gear (210) fixedly connected with the fixed flange (220), the bevel gear (210) being capable of engaging with the input shaft (130) of the power input mechanism (100). A coupling flange (230) is used to fixedly connect the fixed flange (220) and the driving box (320).

5. An underwater gearbox according to any one of claims 1 to 4, characterised in that, The pressure balance mechanism (500) comprises: An adapter (540) is in sealed connection with the power output mechanism (300); A matching piece (530) is installed on the adapter (540), the adapter (540) is provided with a through hole, the matching piece (530) is provided with a balance channel, the balance channel, the through hole and the internal space of the power output mechanism (300) are sequentially communicated; A deformation capsule (510) and a supporting piece (520), the supporting piece (520) supports the deformation capsule (510), the deformation capsule (510) has elasticity, the supporting piece (520) blocks the balance channel, external water can enter the deformation capsule (510) through the opening of the deformation capsule (510) and drive the deformation capsule (510) to expand downward, and the supporting piece (520) can move along the balance channel.

6. The underwater gear box of claim 5, wherein, The pressure balance mechanism (500) further comprises: A filter (550) is arranged at the opening of the deformation capsule (510), and the filter (550) is used to filter external water entering the deformation capsule (510).

7. The underwater gear box of claim 6, wherein, The pressure balance mechanism (500) further comprises: A limiting bottle (570) extends in the up-down direction, the deformation capsule (510) is located in the limiting bottle (570), and the limiting bottle (570) can provide guidance for deformation of the deformation capsule (510).

8. The underwater gearbox according to any one of claims 1 to 4, characterized in that The pressure balance mechanism (500) further comprises: A relief valve, a relief hole is formed in the power output mechanism (300), the relief hole communicates the inside and outside of the underwater gear box, and the relief valve is installed in the relief hole.

9. The underwater gearbox according to any one of claims 1 to 4, characterized in that The underwater gear box further comprises: An indicating mechanism (400) comprising a first indicating assembly (410) and a second indicating assembly (420), the first indicating assembly (410) is in sealed connection with the power input mechanism (100) and engages transmission, the second indicating assembly (420) is in sealed connection with the power output mechanism (300) and engages transmission, and the first indicating assembly (410) and the second indicating assembly (420) are both used to indicate the opening degree of the underwater valve.

10. The underwater gear box of claim 9, wherein, The first indicating assembly (410) comprises: A gear set (417), the input end of the gear set (417) is in sealed connection with the power input mechanism (100) and engages transmission; a first driving shaft (414), an output end of the gear set (417) is fixedly connected with the first driving shaft (414), and the gear set (417) can drive the first driving shaft (414) to rotate around an axial direction of the first driving shaft (414); a first pointer (411) fixedly connected with the first driving shaft (414); and a first mark (412) and a second mark (413), the first mark (412) and the second mark (413) are arranged at intervals around the axial direction of the first driving shaft (414), the first pointer (411) rotates between the first mark (412) and the second mark (413), and any one of the first mark (412) and the second mark (413) indicates that the underwater valve is opened, and the other one indicates that the underwater valve is closed.

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