Vibration isolation device for stern propulsion motor of underwater vehicle

Abstract

The invention belongs to the technical field of noise reduction of underwater vehicles, and provides a vibration isolation device for a stern propulsion motor of an underwater vehicle, the vibration isolation device comprises a connecting ring assembly, the connecting ring assembly is fixedly connected with the underwater vehicle through two groups of axial vibration reduction assemblies, and the axial vibration reduction assemblies are used for reducing vibration of the propulsion motor in the advancing direction of the underwater vehicle; the radial vibration isolation assembly comprises a first fixing ring seat fixedly connected in the connecting ring assembly, a vibration reduction mechanism is arranged in the first fixing ring seat, and the vibration reduction mechanism is used for reducing vibration of the propulsion motor deviating in the radial direction; and the deflection vibration isolation assembly comprises a third fixing ring seat fixedly connected to the vibration reduction mechanism, the third fixing ring seat is connected with the vibration reduction mechanism through a deflection vibration isolation mechanism, and the deflection vibration isolation mechanism is used for reducing rotation vibration of the propulsion motor in the axis direction. Axial vibration, radial vibration and vibration in the advancing direction generated when the propulsion motor works can be effectively weakened and isolated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underwater vehicle noise reduction, and particularly relates to a vibration isolation device for a stern propulsion motor of an underwater vehicle. BACKGROUND

[0002] With the development of science and technology and the demand of ocean development and military application, the concealment of an underwater vehicle is crucial to its combat effectiveness, and the key to improving the concealment of the underwater vehicle is to reduce the radiation noise of the vehicle. Since the vibration generated by the operation of the propulsion motor of the underwater vehicle will emit radiation noise to the water through the shell, it is urgent to improve the vibration isolation efficiency of the stern of the underwater vehicle.

[0003] The existing vibration isolation device for the stern of the underwater vehicle can only have a good vibration isolation effect on single-direction vibration such as axial vibration or radial vibration, and has a poor coupling reduction effect on axial vibration and radial vibration. Meanwhile, affected by ocean currents, the contact between the propeller and the water body will also fluctuate, causing vibration of the propulsion motor along the axial direction of the propulsion motor. The existing vibration isolation device cannot well absorb such vibration. SUMMARY

[0004] The purpose of the application is to provide a vibration isolation device for a stern propulsion motor of an underwater vehicle to solve the above problems.

[0005] To achieve the above purpose, the application provides the following scheme: a vibration isolation device for a stern propulsion motor of an underwater vehicle, comprising:

[0006] A connecting ring assembly is fixedly connected with the underwater vehicle through two groups of axial vibration reduction assemblies, and the axial vibration reduction assemblies are used to reduce the vibration of the propulsion motor along the direction of travel of the underwater vehicle.

[0007] A radial vibration isolation assembly comprises a first fixed ring seat fixedly connected in the connecting ring assembly, a damping mechanism is arranged in the first fixed ring seat, and the damping mechanism is used to reduce the radial offset vibration of the propulsion motor.

[0008] A deflection vibration isolation assembly comprises a third fixed ring seat fixedly connected to the damping mechanism, the propulsion motor is fixedly connected to the third fixed ring seat, and the third fixed ring seat and the damping mechanism are connected through a deflection vibration isolation mechanism, and the deflection vibration isolation mechanism is used to reduce the rotational vibration of the propulsion motor around the axis.

[0009] Preferably, the damping mechanism comprises a ring groove formed in the first fixed ring seat, a second fixed ring seat is arranged in the ring groove, the second fixed ring seat is coaxially arranged with the ring groove, one side of the second fixed ring seat is fixedly connected with one end of a plurality of first vibration isolation springs, the other side of the second fixed ring seat is fixedly connected with one end of a plurality of second vibration isolation springs, the other ends of the plurality of first and second vibration isolation springs are fixedly connected to two opposite side walls of the ring groove.

[0010] Preferably, the third fixed ring seat is fixedly connected to the second fixed ring seat through the deflection vibration isolation mechanism, and the third fixed ring seat is coaxially arranged with the second fixed ring seat.

[0011] Preferably, the deflection vibration isolation mechanism comprises a plurality of clamping grooves, the plurality of clamping grooves are fixedly connected to two opposite side walls of the second fixed ring seat and the third fixed ring seat, respectively, and the plurality of clamping grooves on the second fixed ring seat are arranged one-to-one with the plurality of clamping grooves on the third fixed ring seat, a damping rubber block is fixedly connected in each of the plurality of clamping grooves on the second fixed ring seat, and the plurality of damping rubber blocks are fixedly connected to the plurality of clamping grooves on the third fixed ring seat away from the second fixed ring seat, and an axial limiting piece is further arranged between the second fixed ring seat and the third fixed ring seat.

[0012] Preferably, the axial limiting piece comprises a plurality of limiting columns fixedly connected to the side wall of the third fixed ring seat, the plurality of limiting columns are arranged in parallel with the axis of the third fixed ring seat, a plurality of arc-shaped sliding grooves are formed between the two opposite side walls of the second fixed ring seat, the plurality of limiting columns penetrate through the plurality of arc-shaped sliding grooves, and a limiting block is fixedly connected to the end of the limiting column away from the third fixed ring seat, and the limiting block abuts against the side of the second fixed ring seat away from the third fixed ring seat.

[0013] Preferably, a plurality of damping holes are formed between the two opposite side walls of the damping rubber block, and the damping holes are arranged along the axis of the second fixed ring seat.

[0014] Preferably, the connecting ring assembly comprises an upper clamping ring and a lower clamping ring, the upper clamping ring is detachably connected to the lower clamping ring, the first fixed ring seat is fixedly connected between the upper clamping ring and the lower clamping ring, two groups of supports are fixedly connected to the lower clamping ring, the two supports are symmetrically arranged about the axis of the lower clamping ring, and the two axial damping assemblies are fixedly connected to the two supports, respectively.

[0015] Preferably, the axial damping assembly comprises a sliding block fixedly connected to the bottom of the support and a fixed seat fixedly connected in the underwater vehicle, a sliding groove is formed in the top of the fixed seat along the running direction of the underwater vehicle, the sliding block is slidingly connected in the sliding groove, and a plurality of third vibration isolation springs are arranged between the front end side wall and the rear end side wall of the sliding block and the sliding groove along the sliding direction of the sliding block.

[0016] Preferably, the fixed seat is further provided with a locking assembly, the locking assembly comprises a plug rod slidingly connected in the fixed seat and a plug groove formed in the bottom of the sliding block, the plug rod is matched with the plug groove, and a lifting control member is arranged between the plug rod and the fixed seat.

[0017] Preferably, the lifting control member comprises a sliding rod slidingly connected in the fixed seat and a lead screw rotationally connected in the fixed seat, the sliding rod is threadedly sleeved on the lead screw, one end of the lead screw is drivingly connected with a motor, the top of the sliding rod is fixedly connected with a wedge-shaped block, the bottom of the plug rod is provided with a wedge surface matched with the wedge-shaped block.

[0018] A connecting block is fixedly connected to the side wall of the plug rod, and a spring is arranged between the top of the connecting block and the fixed seat.

[0019] Compared with the prior art, the present application has the following advantages and technical effects: the present application can weaken the vibration of the propulsion motor along the running direction caused by the fluctuation between the propeller and the water body, and the vibration caused by the swing and movement of the propulsion motor along the radial direction and the vibration caused by the deflection of the propulsion motor along the axial direction can be weakened by combining the damping mechanism, the third fixed ring seat and the deflection vibration isolation mechanism, so that the vibration generated by the operation of the propulsion motor can be effectively avoided from radiating noise to the water through the shell, and the vibration isolation efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. 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 effort on the basis of these drawings.

[0021] Figure 1 It is a schematic view of the vibration isolation device of the present application.

[0022] Figure 2 It is another schematic view of the vibration isolation device of the present application.

[0023] Figure 3 It is a connection schematic view of the upper clamping ring and the first fixed ring seat of the present application.

[0024] Figure 4 The connection diagram of the first fixed ring seat and the second fixed ring seat of the application;

[0025] Figure 5 The connection diagram of the second connection ring seat and the third connection ring seat of the application;

[0026] Figure 6 The cross-sectional view of the card slot and the damping rubber block of the application;

[0027] Figure 7 The cross-sectional view of the fixed seat of the application;

[0028] Figure 8 The A partial enlarged view in Figure 7

[0029] 1, upper clamping ring; 2, lower clamping ring; 3, fixed seat; 4, first fixed ring seat; 5, second fixed ring seat; 6, third fixed ring seat; 7, arc-shaped sliding slot; 8, limiting block; 9, first fixed hole; 10, second fixed hole; 11, ring groove; 12, limiting column; 13, card slot; 14, third fixed hole; 15, damping rubber block; 16, damping hole; 17, first vibration isolation spring; 18, second vibration isolation spring; 19, sliding block; 20, sliding slot; 21, third vibration isolation spring; 22, fixed bottom plate; 23, insertion slot; 24, insertion rod; 25, motor; 26, wedge-shaped block; 27, sliding rod; 28, screw rod; 29, wedge surface; 30, spring; 31, connecting block; 32, spring groove. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0031] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0032] In the prior art, there is a clamp type vibration isolation device of a stern propulsion motor of an underwater vehicle, which comprises a clamp ring and a vibration isolator. The clamp ring comprises an upper clamp ring and a lower clamp ring, and the vibration isolator is made of a metamaterial with a periodic structure. The upper clamp ring and the lower clamp ring are fixedly connected together by bolts, the vibration isolator is fixedly connected at the fixed connection of the upper clamp ring and the lower clamp ring, and a parallel interval is left between the upper clamp ring and the lower clamp ring.

[0033] ​The parallel spacing between the upper clamping ring and the lower clamping ring is 1.5 mm.

[0034] The two vibration isolation bodies are connected inside the vibration isolator, and the two vibration isolation bodies are parallel and spaced apart by 5 mm.

[0035] The vibration isolator includes an upper bottom plate, a lower bottom plate, a vibration isolation body, and an insertion skeleton; the insertion skeleton is inserted into the mesh closest to the end face at the upper and lower ends of the vibration isolation body, respectively; the upper bottom plate and the lower bottom plate are located at the upper and lower ends of the vibration isolation body, respectively; and screws are used to connect the insertion skeleton after passing through the counterbores on the upper and lower bottom plates and the through holes on the upper and lower end faces of the vibration isolation body, so that the upper bottom plate and the lower bottom plate are fixedly connected together with the vibration isolation body.

[0036] CH213 glue is applied for bonding when the vibration isolation body is assembled.

[0037] The vibration isolation device of the above scheme includes a clamp ring and a vibration isolator, the clamp ring includes an upper half ring and a lower half ring, and the vibration isolator is made of a metamaterial with a periodic structure; the upper half ring and the lower half ring are fixedly connected together by bolts, the vibration isolator is fixedly connected to the mounting surface of the upper half ring, and the parallel spacing between the upper clamp ring and the lower clamp ring is 1.5 mm. It can be ensured that the clamp ring will not deform severely under certain vibration, and has good safety; the connection in the vibration isolation body is kept tight, so that the vibration isolation performance of the metamaterial vibration isolation body is fully utilized.

[0038] Meanwhile, the two vibration isolation bodies are connected inside the vibration isolator, and the two vibration isolation bodies are parallel and spaced apart by 5 mm, and the periodic mesh structure inside the vibration isolation body is discontinuously continuous, which can prevent the entire vibration isolation body from being deformed and broken when the shape is too large, and improve its safety.

[0039] Meanwhile, the clamp ring and the vibration isolator of the above scheme are tightly connected by screws, so that the vibration energy is better transmitted to the vibration isolator, rather than being released and consumed at the connection to cause the parts to loosen and fall off, and the vibration isolation device has good vibration isolation effect while supporting and impacting the propulsion motor.

[0040] Moreover, the clamp type vibration isolation device of the above scheme can be adapted to any cylindrical propulsion motor body, and the vibration isolation device can be installed on the propulsion motor without adding any external structure to the propulsion motor through the clamp, and the product has strong adaptability.

[0041] Referring to Figures 1-8 , the application provides a vibration isolation device for a propulsion motor at the stern of an underwater vehicle, comprising:

[0042] A connecting ring assembly is fixedly connected to the underwater vehicle through two groups of axial vibration reduction assemblies, and the axial vibration reduction assemblies are used to reduce the vibration of the propulsion motor along the direction in which the underwater vehicle travels.

[0043] The radial vibration isolation assembly comprises a first fixed ring seat 4 fixedly connected in the connecting ring assembly, a damping mechanism arranged in the first fixed ring seat 4, and the damping mechanism is used for reducing the vibration of the propulsion motor in the radial direction.

[0044] The deflection vibration isolation assembly comprises a third fixed ring seat 6 fixedly connected to the damping mechanism, the propulsion motor is fixedly connected to the third fixed ring seat 6, and the third fixed ring seat 6 is connected to the damping mechanism through a deflection vibration isolation mechanism, and the deflection vibration isolation mechanism is used for reducing the rotational vibration of the propulsion motor around the axis direction.

[0045] The axial vibration assembly mainly functions to weaken the vibration of the propulsion motor in the advancing direction when the propeller is in contact with the water body, so as to avoid excessive vibration of the underwater vehicle shell; the damping mechanism mainly functions to enable the motor to move or swing in the radial direction relative to the first fixed ring seat 4, so as to realize the radial vibration isolation effect; the damping mechanism mainly functions to buffer the vibration caused by the relative rotation between the third fixed ring seat 6 and the second fixed ring seat 5 when the propulsion motor is working. Overall, the present application can weaken the vibration of the propulsion motor in the advancing direction caused by the contact between the propeller and the water body, and the present application can also weaken the vibration caused by the swing and movement of the propulsion motor in the radial direction and the deflection of the propulsion motor in the axial direction by combining the damping mechanism, the third fixed ring seat and the deflection vibration isolation mechanism, so as to effectively avoid the vibration of the propulsion motor during operation from being radiated to the water through the shell, and improve the vibration isolation efficiency.

[0046] Further optimization scheme, the damping mechanism comprises a ring groove 11 formed in the first fixed ring seat 4, the second fixed ring seat 5 is arranged in the ring groove 11, the second fixed ring seat 5 is coaxial with the ring groove 11, one side of the second fixed ring seat 5 is fixedly connected with one end of a plurality of first vibration isolation springs 17, the other side of the second fixed ring seat 5 is fixedly connected with one end of a plurality of second vibration isolation springs 18, and the other end of the plurality of first vibration isolation springs 17 and the plurality of second vibration isolation springs 18 are fixedly connected to two opposite side walls of the ring groove 11 respectively.

[0047] Further optimization scheme, the plurality of first vibration isolation springs 17 and the plurality of second vibration isolation springs 18 are respectively arranged at two sides of the second fixed ring seat 5 at equal intervals.

[0048] As shown in Figure 1 and Figure 4 , through the connection of the first vibration isolation spring 17 and the second vibration isolation spring 18, the second fixed ring seat 5 can move in any radial direction in the ring groove 11, and can also deflect relative to the ring groove 11 in the ring groove 11, so as to realize the weakening of the movement and swing of the propulsion motor in the radial direction, and avoid the excessive transmission of the vibration to the underwater vehicle shell.

[0049] In a further optimized design, the third fixed ring seat 6 is fixedly connected to the second fixed ring seat 5 via a deflection vibration isolation mechanism, and the third fixed ring seat 6 and the second fixed ring seat 5 are arranged coaxially.

[0050] The scheme is further optimized. The deflection vibration isolation mechanism includes several slots 13. The slots 13 are fixedly connected to the two opposite side walls of the second fixed ring seat 5 and the third fixed ring seat 6, and the slots 13 on the second fixed ring seat 5 and the slots 13 on the third fixed ring seat 6 are arranged in a one-to-one correspondence. The vibration damping rubber blocks 15 are fixedly connected to the slots 13 on the second fixed ring seat 5, and the side of the vibration damping rubber blocks 15 away from the second fixed ring seat 5 is fixedly connected to the slots 13 on the third fixed ring seat 6. An axial limiting member is also provided between the second fixed ring seat 5 and the third fixed ring seat 6.

[0051] like Figure 5 and Figure 6 As shown, the third fixed ring seat 6 can rotate relative to the second fixed ring seat 5 at a certain angle. Specifically, when the third fixed ring seat 6 is deflected relative to the second fixed ring seat 5 under the drive of the propulsion motor, the slot 13 on the third fixed ring seat 6 pushes the damping rubber block 15, so that the damping rubber block 15 pushes the corresponding slot 13 on the second fixed ring seat 5. The damping rubber block 15 is squeezed between the two slots 13. The vibration caused by the deflection of the third fixed ring seat 6 is absorbed by the deformation of the damping rubber block 15, so as to avoid the vibration being transmitted too much to the hull of the underwater vehicle.

[0052] Further optimize the plan, such as Figure 2 As shown, the third fixing ring seat 6 has several third fixing holes 14. The main function of the third fixing holes 14 is to facilitate the fixed connection of the propulsion motor to the third fixing ring seat 6 by bolts.

[0053] Further optimization of the scheme: the axial limiting component includes several limiting posts 12 fixedly connected to the side wall of the third fixed ring seat 6. The limiting posts 12 are arranged parallel to the axis of the third fixed ring seat 6. Several arc-shaped sliding grooves 7 are opened between the two opposite side walls of the second fixed ring seat 5. The limiting posts 12 pass through the arc-shaped sliding grooves 7, and the end of the limiting post 12 away from the third fixed ring seat 6 is fixedly connected to a limiting block 8. The limiting block 8 abuts against the side of the second fixed ring seat 5 away from the third fixed ring seat 6.

[0054] like Figure 1 and Figure 5As shown, since the damping rubber block 15 abuts between the second fixed ring seat 5 and the third fixed ring seat 6, in order to ensure that the damping rubber block 15 can abut between the second fixed ring seat 5 and the third fixed ring seat 6, a limiting post 12 and a limiting block 8 are provided. The limiting block 8 abuts against the side of the second fixed ring seat 5 away from the third fixed ring seat 6. By fixing the limiting post 12, the third fixed ring seat 6 is prevented from moving away from the second fixed ring seat 5, so that the damping rubber block 15 can always play a damping role.

[0055] Further optimize the plan, such as Figure 6 As shown, a plurality of vibration damping holes 16 are provided between the two opposite sidewalls of the vibration damping block 15, and the vibration damping holes 16 are arranged along the axis of the second fixed ring seat 5.

[0056] The scheme is further optimized. The connecting ring assembly includes an upper retaining ring 1 and a lower retaining ring 2. The upper retaining ring 1 is detachably connected to the lower retaining ring 2. The first fixed ring seat 4 is fixedly connected between the upper retaining ring 1 and the lower retaining ring 2. Two sets of supports are fixedly connected to the lower retaining ring 2. The two supports are symmetrically arranged about the axis of the lower retaining ring 2. Two axial vibration damping components are fixedly connected to the two supports respectively.

[0057] like Figure 1 and Figure 3 As shown, in this embodiment, the first fixing ring seat 4 is fixedly connected to the upper retaining ring 1.

[0058] The upper retaining ring 1 is fixedly connected to the two ends of the lugs. The lugs are provided with several first fixing holes 9, and the support is provided with several threaded holes. By passing the bolts through the first fixing holes 9 and tightening them in the threaded holes, the fixed connection between the upper retaining ring 1 and the lower retaining ring 2 can be achieved.

[0059] Further optimization of the scheme: the axial vibration damping component includes a sliding block 19 fixedly connected to the bottom of the support and a fixed seat 3 fixedly connected inside the underwater vehicle. The top of the fixed seat 3 is provided with a groove 20 along the travel direction of the underwater vehicle. The sliding block 19 is slidably connected in the groove 20. Along the sliding direction of the sliding block 19, a number of third vibration isolation springs 21 are respectively abutted between the front side wall and the rear side wall of the sliding block 19 and the groove 20.

[0060] like Figure 1 and Figure 7 As shown, when the propeller causes axial vibration to the propulsion motor, the propulsion motor transmits the vibration to the sliding block 19 through the third fixed ring seat 6, the second fixed ring seat 5, and the first fixed ring seat 4. The sliding block 19 slides in the slide groove 20, and weakens the vibration by compressing the third vibration isolation springs 21 on the front and rear sides, thus preventing the vibration from being transmitted to the hull of the underwater vehicle through the fixed seat 3.

[0061] Further optimize the plan, such as Figure 1As shown, a fixed base plate 22 is fixedly connected to the bottom of the fixed base 3. Several second fixing holes 10 are provided on the fixed base plate 22. By passing the bolts through the second fixing holes 10 and tightening them on the housing, the connection between this vibration isolation device and the underwater vehicle housing can be realized.

[0062] In a further optimized design, a locking component is provided inside the fixed base 3. The locking component includes a rod 24 that is vertically slidably connected inside the fixed base 3 and a slot 23 that is opened at the bottom of the sliding block 19. The rod 24 is adapted to the slot 23, and a lifting control component is provided between the rod 24 and the fixed base 3.

[0063] Further optimization of the scheme: the lifting control component includes a slide rod 27 slidably connected in the fixed base 3 and a lead screw 28 rotatably connected in the fixed base 3. The slide rod 27 is threaded onto the lead screw 28. One end of the lead screw 28 is connected to a motor 25. A wedge block 26 is fixedly connected to the top of the slide rod 27. A wedge surface 29 is provided at the bottom of the insertion rod 24. The wedge surface 29 is adapted to the wedge block 26.

[0064] A connecting block 31 is fixedly connected to the side wall of the insertion rod 24, and a spring 30 abuts between the top of the connecting block 31 and the fixed seat 3.

[0065] like Figure 7 and Figure 8 As shown, during the stable navigation of the underwater vehicle, in order to avoid power loss, the motor 25 can be controlled to drive the lead screw 28 to rotate, and the slide rod 27 can be moved to the left through the threaded transmission, which will drive the wedge block 26 to move to the left. The wedge surface 29 at the top of the wedge block 26 and the bottom of the insertion rod 24 will push the insertion rod 24 upward, so that the insertion rod 24 is inserted into the slot 23 at the bottom of the sliding block 19, thereby locking the sliding block 19 and stopping the vibration damping effect of the third vibration isolation spring 21.

[0066] like Figure 8 As shown, a spring groove 32 is provided in the fixed base 3, the connecting block 31 is located in the spring groove 32, and the top end of the spring 30 abuts against the top end of the spring groove 32.

[0067] When unstable ocean currents are required or during the start-up phase, the control motor 25 rotates in the reverse direction. At this time, the spring 30 can push the plug rod 24 down through the connecting block 31, disengaging it from the slot 23, so that the sliding block 19 can slide in the slide groove 20.

[0068] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0069] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vibration isolation device for the stern propulsion motor of an underwater vehicle, characterized in that, include: A connecting ring assembly is fixedly connected to the underwater vehicle via two sets of axial vibration damping assemblies, which are used to reduce the vibration of the propulsion motor along the direction of travel of the underwater vehicle. The radial vibration isolation assembly includes a first fixed ring seat (4) fixedly connected within the connecting ring assembly. A vibration damping mechanism is provided within the first fixed ring seat (4) for reducing the vibration of the propulsion motor offset radially. The deflection vibration isolation assembly includes a third fixed ring seat (6) fixedly connected to the vibration damping mechanism. The propulsion motor is fixedly connected to the third fixed ring seat (6). The third fixed ring seat (6) and the vibration damping mechanism are connected through the deflection vibration isolation mechanism. The deflection vibration isolation mechanism is used to reduce the rotational vibration of the propulsion motor around the axis.

2. The vibration isolation device for the stern propulsion motor of an underwater vehicle according to claim 1, characterized in that: The vibration damping mechanism includes an annular groove (11) formed in the first fixed ring seat (4), and a second fixed ring seat (5) is provided in the annular groove (11). The second fixed ring seat (5) is coaxially arranged with the annular groove (11). One side of the second fixed ring seat (5) is fixedly connected to one end of a plurality of first vibration isolation springs (17), and the other side of the second fixed ring seat (5) is fixedly connected to one end of a plurality of second vibration isolation springs (18). The other ends of the plurality of first vibration isolation springs (17) and second vibration isolation springs (18) are respectively fixedly connected to two opposite sidewalls of the annular groove (11).

3. The vibration isolation device for the stern propulsion motor of an underwater vehicle according to claim 2, characterized in that: The third fixed ring seat (6) is fixedly connected to the second fixed ring seat (5) through the deflection vibration isolation mechanism, and the third fixed ring seat (6) and the second fixed ring seat (5) are arranged on the same axis.

4. The vibration isolation device for the stern propulsion motor of an underwater vehicle according to claim 2, characterized in that: The deflection vibration isolation mechanism includes several slots (13), which are fixedly connected to the two opposite side walls of the second fixed ring seat (5) and the third fixed ring seat (6). The slots (13) on the second fixed ring seat (5) and the slots (13) on the third fixed ring seat (6) are arranged in a one-to-one correspondence. Vibration damping blocks (15) are fixedly connected in the slots (13) on the second fixed ring seat (5). The side of the vibration damping blocks (15) away from the second fixed ring seat (5) is fixedly connected in the slots (13) on the third fixed ring seat (6). An axial limiting member is also provided between the second fixed ring seat (5) and the third fixed ring seat (6).

5. A vibration isolation device for a stern propulsion motor of an underwater vehicle according to claim 4, characterized in that: The axial limiting component includes several limiting posts (12) fixedly connected to the side wall of the third fixed ring seat (6). The limiting posts (12) are arranged parallel to the axis of the third fixed ring seat (6). Several arc-shaped grooves (7) are opened between the two opposite side walls of the second fixed ring seat (5). The limiting posts (12) pass through the arc-shaped grooves (7). A limiting block (8) is fixedly connected to one end of the limiting post (12) away from the third fixed ring seat (6). The limiting block (8) abuts against the side of the second fixed ring seat (5) away from the third fixed ring seat (6).

6. The vibration isolation device for the stern propulsion motor of an underwater vehicle according to claim 4, characterized in that: A plurality of damping holes (16) are provided between the two opposite sidewalls of the damping block (15), and the damping holes (16) are arranged along the axis of the second fixing ring seat (5).

7. The vibration isolation device for the stern propulsion motor of an underwater vehicle according to claim 1, characterized in that: The connecting ring assembly includes an upper retaining ring (1) and a lower retaining ring (2). The upper retaining ring (1) is detachably connected to the lower retaining ring (2). The first fixing ring seat (4) is fixedly connected between the upper retaining ring (1) and the lower retaining ring (2). Two sets of supports are fixedly connected to the lower retaining ring (2). The two supports are symmetrically arranged about the axis of the lower retaining ring (2). The two axial vibration damping components are fixedly connected to the two supports respectively.

8. A vibration isolation device for a stern propulsion motor of an underwater vehicle according to claim 7, characterized in that: The axial vibration damping assembly includes a sliding block (19) fixedly connected to the bottom of the support and a fixed seat (3) fixedly connected inside the underwater vehicle. The top of the fixed seat (3) is provided with a groove (20) along the traveling direction of the underwater vehicle. The sliding block (19) is slidably connected in the groove (20). Along the sliding direction of the sliding block (19), the front side wall and the rear side wall of the sliding block (19) are respectively abutted against the groove (20) by a plurality of third vibration damping springs (21).

9. A vibration isolation device for a stern propulsion motor of an underwater vehicle according to claim 8, characterized in that: The fixed base (3) is also provided with a locking component, which includes a vertically sliding rod (24) connected in the fixed base (3) and a slot (23) opened at the bottom of the sliding block (19). The rod (24) is adapted to the slot (23), and a lifting control component is provided between the rod (24) and the fixed base (3).

10. A vibration isolation device for a stern propulsion motor of an underwater vehicle according to claim 9, characterized in that: The lifting control component includes a slide rod (27) slidably connected in the fixed base (3) and a lead screw (28) rotatably connected in the fixed base (3). The slide rod (27) is threaded onto the lead screw (28). One end of the lead screw (28) is connected to a motor (25). A wedge block (26) is fixedly connected to the top of the slide rod (27). A wedge surface (29) is provided at the bottom of the insertion rod (24). The wedge surface (29) is adapted to the wedge block (26). A connecting block (31) is fixedly connected to the side wall of the insertion rod (24), and a spring (30) abuts between the top of the connecting block (31) and the fixing seat (3).

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