An underwater propeller sealing structure for seabed operations

Abstract

The present invention relates to the field of underwater thrusters, and in particular to a sealing structure of an underwater thruster for seabed operations, comprising an installation cabin, one end of which is connected to a pushing head, a sealing cabin coaxially connected in the installation cabin, a driving shaft for driving the pushing head passing through the sealing cabin, and a sealing end for sealing being commonly connected between the installation cabin, the sealing cabin and the pushing head; the present invention effectively offsets the friction force, centrifugal force, radial runout and axial movement of the sealing block when the driving shaft rotates through the coordinated cooperation between components such as a clamping spring, a damping bag, a suspension block, a buffer pad, a limit stop block and a pressure spring, thereby ensuring that the sealing block is always in close contact with the surface of the driving shaft under different working conditions, avoiding abnormal deformation and wear, and extending the service life of the sealing block.

Description

Technical Field

[0001] The invention relates to the field of underwater propellers, and in particular to a sealing structure of an underwater propeller for seabed operations. Background Art

[0002] In deep-sea operation environments, underwater thrusters are responsible for driving submersibles, submarines or underwater robots to move and position. Due to the huge pressure and high salt content of the deep-sea environment, underwater thrusters need to maintain good sealing in the high-pressure environment of the seabed to ensure the normal operation and safety of the thrusters.

[0003] However, there are usually some problems with the ordinary technical means for sealing underwater thrusters in daily use. With the development of science and technology, technical personnel in related fields have also made a lot of optimizations on the technical means for sealing underwater thrusters. In order to make a more accurate comparison, a Chinese patent with publication number CN114455044A discloses an underwater thruster with a sealed cabin structure, including a sealed cabin, a motor, a propeller, a first sealing groove and a first sealing ring; when in use, the first sealing ring is abutted against the front cover of the sealed cabin to form a first sealing structure, a circle of second sealing grooves is provided on the outer side surface of the first sealing protrusion, the second sealing ring is clamped in the second sealing groove, and the second sealing ring is abutted against the inner wall of the sealed cabin body to form a second sealing structure, thereby achieving a high-strength waterproof seal for the motor.

[0004] However, the above sealing means still have some shortcomings in actual use:

[0005] The above-mentioned device forms a first sealing structure by abutting against the front cover of the sealed cabin through the first sealing ring, and a circle of second sealing groove is provided on the outer side surface of the first sealing protrusion, the second sealing ring is clamped in the second sealing groove, and the second sealing ring is abutted against the inner wall of the sealed cabin body to form a second sealing structure, so as to achieve high-strength waterproof sealing of the motor. In actual use, since the underwater thruster needs to drive the propulsion paddle to rotate to drive the connected equipment to move underwater, in this process, it is necessary to continuously drive the bearing and propulsion paddle outside the sealed cabin to rotate through the output shaft passing through the sealed cabin, and the output shaft of the motor will produce a certain radial runout and axial movement during operation, and this runout and movement will lead to This causes the contact pressure between the sealing ring and the sealing cabin body and the output shaft to be unstable, thereby affecting the sealing effect. Although the above-mentioned device can reduce a part of the radial runout and axial movement of the output shaft by externalizing the bearing, it cannot completely avoid the problem of unstable contact pressure between the sealing ring and the sealing cabin body and the output shaft. In addition, the above-mentioned device only achieves the sealing effect by the first sealing ring and the second sealing ring supporting the sealing cabin. Therefore, when used in a deep-sea high-pressure environment, the first sealing ring and the second sealing ring will be in a state of abnormal extrusion and deformation for a long time, which can easily cause the first sealing ring and the second sealing ring to fail to fit tightly on the sealing cabin in time after a long time, affecting the sealing effect.

[0006] Therefore, based on the above-stated viewpoints, there is still room for improvement in the existing sealing methods for underwater thrusters. Summary of the invention

[0007] In order to solve the above problems, the present invention provides an underwater thruster sealing structure for seabed operations, including an installation cabin, one end of which is connected to a propulsion head, a sealing cabin is coaxially connected to the installation cabin, a driving shaft for driving the propulsion head passes through the sealing cabin, and a sealing end for sealing is commonly connected between the installation cabin, the sealing cabin and the propulsion head.

[0008] The sealing end includes a groove formed inwardly at one end of the sealing cabin close to the pushing head, and a sealing block sleeved on the driving shaft is abutted between the groove and the pushing head. A limiting groove is provided on the sealing block, and a clamping spring with an annular structure is limitedly connected in the limiting groove to provide the sealing block with a centripetal force to always stick close to the driving shaft.

[0009] Preferably, a mounting cavity is formed in the sealing block, and a damping capsule sleeved on the driving shaft is limit-connected in the mounting cavity, and the damping capsule is made of a material with a certain flexible deformation ability.

[0010] Preferably, a plurality of suspension blocks are evenly spaced apart and sleeved on the driving shaft, a plurality of buffer grooves corresponding to the suspension blocks are formed on the inner wall of the sealing cabin, and a buffer pad limitedly located in the buffer groove is sleeved on the suspension block.

[0011] Preferably, several of the suspension blocks are correspondingly inserted into several buffer grooves.

[0012] Preferably, the sealing cabin is also provided with limit stops evenly arranged circumferentially corresponding to the plurality of suspension blocks, a pressure spring is commonly connected between the limit stops and the sealing cabin, and the plurality of limit stops distributed on both sides of the same suspension block are symmetrically and correspondingly arranged.

[0013] Preferably, a sealing partition connected to the push head is sleeved on the sealing cabin, and the sealing partition is in contact with and fits with the installation cabin and the sealing cabin at the same time.

[0014] Preferably, a limiting sleeve is further provided in the sealing cabin, and a conducting tube passing through the installation cabin is commonly connected to the limiting sleeve, the sealing cabin and the installation cabin, and the end of the limiting sleeve close to the pushing head is coaxially connected to a limiting baffle, the size of the limiting baffle is larger than the size of the limiting sleeve, and the outer side surfaces of the limiting sleeve and the limiting baffle are commonly provided with a sliding sleeve, and a sliding connecting rod connected to the sliding sleeve is commonly passed through the limiting sleeve and the limiting baffle, and a plurality of through openings are evenly opened in the circumference of the end of the sliding sleeve away from the pushing head, and a closer for closing it is connected in the through opening, and a plurality of resistance rods are arranged on the limiting baffle corresponding to the plurality of through openings, which are used to unlock the closer to open the through openings.

[0015] Preferably, the closer comprises a pressure block slidably embedded in the through-hole, the pressure block is symmetrically connected to a connecting slide rod penetrating the sliding sleeve, and the connecting slide rod is sleeved with a compression spring connected to the limiting sleeve.

[0016] Preferably, one end of the sliding connecting rod passing through the limiting sleeve is connected to a piston block which fits and contacts the inner wall of the limiting sleeve.

[0017] Preferably, the sliding connecting rod is sleeved with a compression spring located between the piston block and the limit baffle.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] 1. The present invention effectively offsets the effects of friction, centrifugal force, radial runout and axial movement of the sealing block when the drive shaft rotates through the coordinated cooperation between the clamping spring, damping bag, suspension block, buffer pad, limit block and pressure spring, thereby ensuring that the sealing block is always in close contact with the surface of the drive shaft under different working conditions, avoiding abnormal deformation and wear, and extending the service life of the sealing block.

[0020] 2. The present invention utilizes components such as a conducting tube, a limiting sleeve, a sliding sleeve, a piston block, and a compressed spring. When operating in a high-pressure seabed environment, the seawater is driven into the limiting sleeve through the pressure difference between the seawater pressure and the installation cabin and the sealed cabin, thereby pushing the piston block and the sliding sleeve to slide, so that the sliding sleeve forms a cavity relative to the limiting sleeve and the limiting baffle, and then drives part of the gas in the sealed cabin to be introduced into the cavity, thereby realizing pressure regulation and pressure balance between the installation cabin and the outside world and between the sealed cabin and the installation cabin, and effectively avoiding the influence of the high seabed pressure on the sealing performance of the sealing block.

[0021] 3. The present invention absorbs and delays the radial runout and axial movement generated when the drive shaft rotates through the elastic deformation of the buffer pad and the pressure spring, and supports and limits the push head and the part of the drive shaft that passes through the sealing cabin through the sealing partition, thereby avoiding the suspended setting of the drive shaft, reducing the transmission of vibration and runout to the push head, and effectively avoiding the problem of abnormal extrusion and deformation of the sealing block caused by the rotation of the drive shaft.

[0022] Fourth, the present invention uses water from the outside entering the installation cabin to squeeze the push plate to slide, driving the liquid medium between the push plate and the sealing baffle to be further squeezed. After the space between the push plate and the sealing baffle is compressed and reduced, the liquid medium therein will be further squeezed and introduced into the damping bag, so that the damping bag has a tendency to further expand, thereby more closely abutting against the drive shaft, thereby improving the sealing effect between the drive shaft, the sealing cabin and the push head. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a cross-sectional structural diagram of the installation cabin of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the sealing end of the present invention.

[0027] Figure 4 It is a structural schematic diagram of the limiting sleeve of the present invention.

[0028] Figure 5 The present invention Figure 4 A is an enlarged view of the middle image.

[0029] Figure 6 It is a structural schematic diagram of the sliding sleeve of the present invention.

[0030] Figure 7 It is a structural schematic diagram of the piston block of the present invention.

[0031] Figure 8 The present invention Figure 7 Enlarged view of B.

[0032] Fig. 9 It is a structural schematic diagram of the pushing plate of the present invention.

[0033] In the figure, 1, installation cabin; 10, pushing head; 11, sealing cabin; 12, driving shaft; 2, sealing end; 20, sealing block; 21, limiting groove; 22, clamping spring; 23, damping bag; 24, suspension block; 240, buffer pad; 25, limiting block; 250, pressing spring; 26, sealing partition; 3, limiting sleeve; 30, conducting pipe; 31, limiting baffle; 32, sliding sleeve; 33, sliding connecting rod; 34, through-port; 35, closer; 350, pressing block; 351, connecting sliding rod; 352, compression spring; 36, contact rod; 37, piston block; 370, compression spring; 4, pushing plate; 40, connecting pipe; 41, limiting ring plate. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1 To Attachment Fig. 9 Embodiments of the present invention are described in detail.

[0035] The embodiment of the present application discloses a sealing structure of an underwater thruster for seabed operations, and it is explained that the present application is mainly used in the process of the underwater thruster operating on the seabed, and technically realizes the sealing effect of the underwater thruster during the seabed operation; in particular, in the seabed operation process, through the cooperation between the sealing block, the clamping spring and the damping bag, the problem of abnormal extrusion deformation of the sealing block driven by the driving shaft under high pressure environment is effectively avoided; further, the present application also realizes the effect of relieving the pressure in the sealing cabin through the sliding cooperation of the limit sleeve and the sliding sleeve.

[0036] Example 1: Reference Figure 1 As shown, a sealing structure of an underwater propeller for seabed operations includes an installation cabin 1, a propulsion head 10, a sealing cabin 11, a driving shaft 12 and a sealing end 2. The installation cabin 1 is connected to the underwater operation equipment when in use, and the end of the installation cabin 1 away from the operation equipment is connected to the propulsion head 10, and a plurality of blades are evenly arranged on the outer side surface of the propulsion head 10. A sealing cabin 11 is also coaxially connected to the installation cabin 1, and the sealing cabin 11 and the installation cabin 1 are connected by a connecting frame. A driving shaft 12 for driving the propulsion head 10 passes through the sealing cabin 11, and the propulsion head 10 and the blades are driven to rotate by the driving shaft 12 to drive the equipment as a whole to move on the seabed. A sealing end 2 for sealing is commonly connected between the installation cabin 1, the sealing cabin 11 and the propulsion head 10.

[0037] Reference Figure 2 and Figure 3As shown, the sealing end 2 is used for sealing; specifically, the sealing end 2 includes a sealing block 20, a limiting groove 21 and a clamping spring 22. The sealing cabin 11 is concave at one end close to the pushing head 10 to form a groove. The groove and the pushing head 10 jointly abut against a sealing block 20 sleeved on the driving shaft 12. The sealing block 20 is provided with a limiting groove 21 with an annular structure. The limiting groove 21 is limitedly connected with a clamping spring 22 with an annular structure for providing the sealing block 20 with a centripetal force to always stick close to the driving shaft 12.

[0038] During use, in the initial static state, the radial pressure of the clamping spring 22 causes the sealing block 20 to press against the surface of the drive shaft 12 to form an initial seal. When the drive shaft 12 drives the push head 10 and the paddles to start rotating, the sealing block 20 is squeezed and deformed under the action of the rotational friction and centrifugal force of the drive shaft 12. At this time, due to the clamping spring 22 tightening the sealing block 20, a part of the friction and centrifugal force on the sealing block 20 is offset, keeping the sealing block 20 always pressed against the outer side of the drive shaft 12, thereby ensuring the sealing effect of the sealing block 20 under different working conditions, effectively avoiding abnormal deformation and wear of the sealing block 20 after long-term use, and extending the service life of the sealing block 20.

[0039] Further, refer to Figures 3 to 5 As shown, in order to further offset the deformation of the sealing block 20 caused by the rotation of the drive shaft 12, an installation cavity is further formed in the sealing block 20, and a damping capsule 23 sleeved on the drive shaft 12 is limitedly connected in the installation cavity. The damping capsule 23 is made of a material with a certain flexible deformation ability. In the initial state, a fluid medium is first injected into the damping capsule 23 to expand the damping capsule 23 and fill the installation cavity. The fluid medium is preferably a liquid medium with a certain viscosity, such as hydraulic oil, a water-ethylene glycol mixture, etc.

[0040] When in use, after the damping bag 23 expands and presses against the driving shaft 12, the driving shaft 12 is driven to rotate. When the driving shaft 12 rotates, the forces generated by the radial runout and axial movement will act on the damping bag 23 and the sealing block 20 synchronously. Then the clamping spring 22 clamps the sealing block 20 to always press against the driving shaft 12. The damping bag 23 will deform after being subjected to the force, driving the fluid therein to flow in the damping bag 23. Due to the pressure resistance and viscosity of the liquid medium, the liquid in the damping bag 23 produces a damping effect, which effectively slows down the speed and amplitude of the extrusion force on the driving shaft 12, thereby alleviating the extrusion force transmitted from the driving shaft 12 to the sealing block 20 and the damping bag 23, avoiding excessive extrusion and deformation of the sealing block 20 by the driving shaft 12, and ensuring the sealing effect of the sealing block 20 on the driving shaft 12 under different working conditions.

[0041] Reference Figures 2 to 5As shown, in order to alleviate the radial runout and axial movement generated when the drive shaft 12 rotates, a plurality of suspension blocks 24 are evenly spaced on the drive shaft 12, and a plurality of buffer grooves corresponding to the suspension blocks 24 are formed on the inner wall of the sealed cabin 11. A buffer pad 240 is limitedly positioned in the buffer groove on the suspension block 24. The buffer pad 240 can be set as an elastic pad with elastic deformation, or it can be set in a hollow shape together with the damping bag 23, and then a fluid medium is injected therein, so that when the drive shaft 12 carries a plurality of suspension blocks 24 and radially runs out, the displacement amplitude and speed of the drive shaft 12 and the suspension blocks 24 are reduced through the deformation of the buffer pad 240, thereby achieving the effect of alleviating the radial runout generated when the drive shaft 12 rotates.

[0042] Further, refer to Figures 3 to 5 As shown, a plurality of suspension blocks 24 are correspondingly inserted into a plurality of buffer grooves. By inserting the suspension blocks 24 into corresponding buffer grooves, the amplitude of axial movement of the suspension blocks 24 driven by the drive shaft 12 is effectively limited.

[0043] Furthermore, refer to Figures 3 to 5 As shown, the sealed cabin 11 is also provided with limit push blocks 25 evenly arranged in the circumferential direction corresponding to the plurality of suspension blocks 24, and a pressure spring 250 is commonly connected between the limit push blocks 25 and the sealed cabin 11, and the plurality of limit push blocks 25 distributed on both sides of the same suspension block 24 are symmetrically and correspondingly arranged. When in use, when the driving shaft 12 drives the plurality of suspension blocks 24 to move axially, the suspension blocks 24 are driven to abut against the limit push blocks 25 and push the limit push blocks 25 to shift, and then the pressure spring 250 connected to the limit push blocks 25 is compressed. When the pressure spring 250 is compressed, the kinetic energy of the suspension blocks 24 driven by the driving shaft 12 to move axially is absorbed, and then converted into the elastic potential energy of the pressure spring 250 itself. In the process of the pressure spring 250 generating elastic deformation, the axial movement speed of the mutually conflicting suspension blocks 24 is delayed, thereby achieving a buffering effect on the axial movement of the driving shaft 12 and the suspension blocks 24.

[0044] At the same time, the limit stop 25 on the other side of the suspension block 24 slides towards the direction close to the suspension block 24 under the drive of the connected pressure spring 250 until the limit stop 25 regains contact with the suspension block 24, so that the pressure springs 250 on both sides of the suspension block 24 are further compressed on one side and released and stretched on the other side. As the drive shaft 12 continuously moves axially, the states of the pressure springs 250 on both sides of the suspension block 24 are also continuously interchanged, so as to achieve the effect of alleviating the axial movement generated when the drive shaft 12 rotates.

[0045] Reference Figures 3 to 5As shown, in order to improve the stability of the operation of the drive shaft 12 after passing through the sealed cabin 11, a sealing partition 26 connected to the push head 10 is sleeved on the sealed cabin 11, and the sealing partition 26 is in contact with the installation cabin 1 and the sealed cabin 11. When in use, the drive shaft 12 drives the push head 10 to rotate and also drives the sealing partition 26 to rotate synchronously. The sealing partition 26 rotates along the outer side of the sealed cabin 11. The push head 10 and the drive shaft 12 passing through the sealed cabin 11 are supported and limited by the sealing partition 26, which effectively avoids the suspended setting of the drive shaft 12. At the same time, the sealing partition 26 is in contact with the installation cabin 1 and the sealed cabin 11, which avoids the problem that the vibration and jumping effects generated when the drive shaft 12 is driven are transmitted to the push head 10 and then amplified.

[0046] Reference Figures 4 to 7 As shown, in view of the use of high pressure on the seabed, in order to prevent the high pressure on the seabed from affecting the overall sealing performance of the underwater thruster, a limiting sleeve 3 is further arranged in the sealing cabin 11, and the limiting sleeve 3, the sealing cabin 11 and the installation cabin 1 are commonly connected with a conducting pipe 30 passing through the installation cabin 1, and a pressure valve is arranged in the conducting pipe 30 for adjusting the pressure balance between the installation cabin 1, the sealing cabin 11, the limiting sleeve 3 and the outside world, and the limiting sleeve 3 is coaxially connected to a limiting baffle 31 at one end close to the pushing head 10, and the size of the limiting baffle 31 is larger than that of the limiting sleeve 3. The outer side surfaces of the limit sleeve 3 and the limit baffle 31 are jointly slidably sleeved with a sliding sleeve 32, and the limit sleeve 3 and the limit baffle 31 are jointly slidably penetrated with a sliding connecting rod 33 connected to the sliding sleeve 32, and the sliding sleeve 32 is uniformly circumferentially provided with a plurality of through openings 34 at one end away from the pushing head 10, and a closer 35 for closing the through openings 34 is connected to the through openings 34, and a plurality of resistance rods 36 are arranged on the limit baffle 31 corresponding to the plurality of through openings 34, which are used to unlock the closer 35 to open the through openings 34.

[0047] When used in a high-pressure submarine environment, due to the pressure difference between the installation chamber 1 and the seawater on both sides of the pressure valve, the pressure valve is opened, and the seawater enters the limiting sleeve 3 through the guide pipe 30, pushing the sliding connecting rod 33 and the sliding sleeve 32 to slide toward the side close to the push head 10. The sliding sleeve 32 moves and drives the closer 35 connected thereto to move to contact the resistance rod 36. Then, as the sliding sleeve 32 and the closer 35 continue to slide, the resistance rod 36 pushes the closer 35 and the sliding sleeve 32 to slide relative to each other. The sliding sleeve 32 and the limiting sleeve 3 slide relative to each other, so that a cavity is formed between the sliding sleeve 32 and the limiting baffle 31. At this time, the opening of the through hole 34 on the sliding sleeve 32 causes the pressure difference between the sealed cabin 11 and the cavity to allow part of the gas in the sealed cabin 11 to be introduced into the cavity, thereby achieving the effect of relieving the pressure in the sealed cabin 11 and balancing the pressure between the installation cabin 1 and the seabed when operating in a high-pressure environment on the seabed.

[0048] Reference Figures 6 to 8 As shown, one end of the sliding connecting rod 33 passing through the limiting sleeve 3 is connected with a piston block 37 which fits and contacts the inner wall of the limiting sleeve 3. When in use, the piston block 37 is slidably contacted with the inner wall of the limiting sleeve 3, and the contact area between the sliding connecting rod 33 and the seawater is increased by the piston block 37, thereby increasing the speed at which the sliding sleeve 32 forms a cavity relative to the limiting sleeve 3 and the limiting baffle 31, and at the same time, the contact of the piston block 37 effectively prevents the seawater from entering the sliding sleeve 32.

[0049] Reference Figure 7 and Figure 8 As shown, a compression spring 370 is sleeved on the sliding link 33 and is located between the piston block 37 and the limit baffle 31. When in use, when the piston block 37, the sliding link 33 and the sliding sleeve 32 are pushed to slide in the direction close to the push head 10, the compression spring 370 is compressed. When the seabed operation is completed or the seawater pressure is moved to a point where it is not higher than the air pressure in the installation cabin 1 and the sealed cabin 11, the compression spring 370 begins to resume its extension and drives the sliding link 33, the piston block 37 and the sliding sleeve 32 to reset.

[0050] Reference Figure 7 and Figure 8 As shown, the closer 35 includes a pressure block 350 which is slidably embedded in the through opening 34 and is arranged in a "T"-shaped structure. The horizontal section of the pressure block 350 is symmetrically connected with a connecting slide rod 351 which is passed through the sliding sleeve 32. The connecting slide rod 351 is sleeved with a compression spring 352 which is connected to the limiting sleeve 3. The vertical section of the pressure block 350 is slidably inserted in the through opening 34.

[0051] When in use, when the sliding sleeve 32 is driven to slide in the direction close to the limit baffle 31, the resistance rod 36 on the limit baffle 31 contacts the pressure block 350 and then pushes the pressure block 350 to break contact with the through-hole 34. The movement of the pressure block 350 drives the connected connecting sliding rod 351 to slide, and drives the compression spring 352 to be compressed. At this time, the gas in the sealed cabin 11 can be introduced into the cavity through the through-hole 34 to complete the pressure regulation effect in the sealed cabin 11.

[0052] Example 2: Reference Fig. 9 As shown, on the basis of the first embodiment, in order to further improve the sealing effect between the drive shaft 12, the sealing cabin 11 and the push head 10, the conducting pipe 30 commonly arranged between the installation cabin 1, the sealing cabin 11 and the limiting sleeve 3 is arranged to be distributed in two sections at intervals, one section passes through the installation cabin 1 and is connected to the outside, and a pressure valve is arranged therein, and the other section is arranged on the sealing cabin 11 for connecting the limiting sleeve 3 and the installation cabin 1, and a push plate 4 that fits the installation cabin 1 and the sealing cabin 11 is slidably connected in the accommodating cavity, and a connecting conduit 40 that passes through the sealing block 20 and the sealing cabin 11 is evenly connected circumferentially on the damping capsule 23, and the connecting conduit 40, the damping capsule 23 and the accommodating cavity are connected to each other, and a limiting ring plate 41 for limiting the push plate 4 is coaxially arranged on the installation cabin 1 and the sealing cabin 11, and the two limiting ring plates 41 respectively limit the outer edge and the inner edge of the push plate, and in the initial state, a liquid medium is injected between the push plate 4, the installation cabin 1, the sealing partition 26 and the sealing cabin 11.

[0053] When working in a high-pressure submarine environment, since the high pressure on the seabed outside the installation cabin 1 is higher than the pressure inside the installation cabin 1 and the sealing cabin 11, the installed pressure valve is driven to be opened, thereby introducing the external water into the accommodating chamber. After the external water enters the accommodating chamber, it pushes the push plate 4 in the accommodating chamber to slide in the direction close to the push head 10, thereby driving the liquid medium between the push plate 4 and the sealing partition 26 to be further squeezed. At the same time, due to the incompressible nature of the liquid medium itself and the fact that the damping bag 23 has a certain ability to deform flexibly, after the space between the push plate 4 and the sealing partition 26 is compressed and reduced, the liquid medium therein will be further squeezed and introduced into the damping bag 23, so that the damping bag 23 has a tendency to further expand, thereby more closely abutting against the drive shaft 12, so as to improve the sealing effect between the drive shaft 12, the sealing cabin 11 and the push head 10.

[0054] During operation: the first step is to install the sealing block 20 in the groove on the sealing chamber 11 and put it on the driving shaft 12, and then simultaneously install the clamping spring 22 on the sealing block 20. The radial pressure provided by the clamping spring 22 makes the sealing block 20 close to the surface of the driving shaft 12 to form an initial seal.

[0055] Step 2: inject a viscous liquid medium between the installation chamber 1 and the sealing chamber 11 and into the damping capsule 23 , so that the damping capsule 23 partially expands and then fills the sealing block 20 to contact the driving shaft 12 .

[0056] Step 3: The driving shaft 12 drives the pushing head 10 and the paddles to rotate. When the pushing device moves, the sealing block 20 is kept close to the surface of the driving shaft 12 through the combined action of the clamping spring 22 and the damping bag 23 to ensure the sealing effect of the sealing block 20. At the same time, the radial runout and axial movement of the driving shaft 12 during rotation are absorbed and buffered through a number of suspension blocks 24, buffer pads 240 and pressure springs 250.

[0057] Step 4: When working under a high-pressure environment on the seabed, the pressure valve is opened by the high pressure on the seabed, and seawater enters the limiting sleeve 3, pushing the sliding sleeve 32 and the closer 35 to move relative to the limiting sleeve 3, and opening the through port 34, so that part of the gas in the sealed cabin 11 is introduced into the cavity, thereby achieving pressure regulation and pressure balance.

[0058] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered as exemplary and non-restrictive in all respects.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A sealing structure for an underwater propeller used in seabed operations, comprising an installation cabin (1), characterized in that: One end of the installation cabin (1) is connected to a driving head (10), a sealing cabin (11) is coaxially connected to the installation cabin (1), a driving shaft (12) for driving the driving head (10) passes through the sealing cabin (11), and a sealing end (2) for sealing is commonly connected between the installation cabin (1), the sealing cabin (11) and the driving head (10), wherein: The sealing end (2) comprises a groove formed by a concave groove at one end of the sealing cabin (11) close to the pushing head (10), and a sealing block (20) sleeved on the driving shaft (12) is abutted between the groove and the pushing head (10). The sealing block (20) is provided with a limiting groove (21), and a clamping spring (22) arranged in an annular structure is connected in a limiting manner in the limiting groove (21) to provide the sealing block (20) with a centripetal force to always abut against the driving shaft (12). A limiting sleeve (3) is also arranged in the sealing cabin (11), and a conducting pipe (30) arranged between the installation cabin (1), the sealing cabin (11) and the limiting sleeve (3) is arranged to be distributed in two sections at intervals, one section passes through the installation cabin (1) and is connected to the outside, and a pressure valve is arranged therein, and the other section passes through the sealing cabin (11) and is used to communicate with the limiting sleeve. (3) and the installation chamber (1), one end of the limiting sleeve (3) close to the pushing head (10) is coaxially connected to the limiting baffle (31), the size of the limiting baffle (31) is larger than the size of the limiting sleeve (3), the outer side surfaces of the limiting sleeve (3) and the limiting baffle (31) are jointly slidably sleeved with a sliding sleeve (32), the limiting sleeve (3) and the limiting baffle (31) are jointly penetrated with a sliding connecting rod (33) connected to the sliding sleeve (32), one end of the sliding sleeve (32) away from the pushing head (10) is uniformly provided with a plurality of through openings (34) in the circumferential direction, a closer (35) for closing the through openings (34) is connected in the through openings (34), and a plurality of abutment rods (36) are provided on the limiting baffle (31) corresponding to the plurality of through openings (34) for unlocking the closer (35) to open the through openings (34).

2. The sealing structure of an underwater propeller for seabed operations according to claim 1, characterized in that: The sealing block (20) is also provided with an installation cavity, and a damping capsule (23) sleeved on the driving shaft (12) is limit-connected in the installation cavity, and the damping capsule (23) is made of a material with a certain degree of flexible deformation capability.

3. The sealing structure of an underwater propeller for seabed operations according to claim 1, characterized in that: The driving shaft (12) is also sleeved with a plurality of suspension blocks (24) at even intervals, and a plurality of buffer grooves corresponding to the suspension blocks (24) are formed on the inner wall of the sealed cabin (11), and a buffer pad (240) is sleeved on the suspension block (24) and limitedly located in the buffer groove.

4. The sealing structure of an underwater propeller for seabed operations according to claim 3, characterized in that: The plurality of suspension blocks (24) are correspondingly inserted into the plurality of buffer grooves.

5. The sealing structure of an underwater propeller for seabed operations according to claim 3, characterized in that: The sealed cabin (11) is also provided with limit stop blocks (25) evenly arranged in the circumferential direction corresponding to the plurality of suspension blocks (24); a pressure spring (250) is commonly connected between the limit stop blocks (25) and the sealed cabin (11); and the plurality of limit stop blocks (25) distributed on both sides of the same suspension block (24) are symmetrically and correspondingly arranged.

6. The sealing structure of an underwater propeller for seabed operations according to claim 1, characterized in that: The sealed cabin (11) is sleeved with a sealed partition (26) connected to the push head (10), and the sealed partition (26) is in contact with and fits with the installation cabin (1) and the sealed cabin (11) at the same time.

7. The sealing structure of an underwater propeller for seabed operations according to claim 1, characterized in that: The closer (35) comprises a pressure block (350) slidably embedded in the through opening (34), the pressure block (350) being symmetrically connected to a connecting slide rod (351) passing through the sliding sleeve (32), and the connecting slide rod (351) being sleeved with a compression spring (352) connected to the limiting sleeve (3).

8. The sealing structure of an underwater propeller for seabed operations according to claim 7, characterized in that: One end of the sliding connecting rod (33) passing through the limiting sleeve (3) is connected to a piston block (37) that fits in contact with the inner wall of the limiting sleeve (3).

9. The sealing structure of an underwater propeller for seabed operations according to claim 8, characterized in that: The sliding connecting rod (33) is sleeved with a compression spring (370) located between the piston block (37) and the limit baffle (31).

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