Sealing structure and speed reducer based on screw counter-pressure and tesla valve structure

Abstract

The application discloses a sealing structure based on screw counter-pressure and Tesla valve structure, which comprises a shell, a rotating shaft installed on the shell, a transmission assembly arranged in the shell, the rotating shaft being matched with the transmission assembly to output or acquire driving force; a through hole for matching the rotating shaft is arranged on the shell, a thread is arranged on the side surface of the rotating shaft corresponding to the through hole, and the thread is used for providing liquid pushing force to the outside of the shell through the through hole when the rotating shaft rotates; the side surface of the rotating shaft and the inner wall of the through hole form a Tesla valve structure, the Tesla valve structure is closer to the outer opening of the through hole on the shell relative to the thread on the rotating shaft; the counter-flow direction of the Tesla valve structure is the direction from the outside of the shell corresponding to the through hole to the inside of the shell, and the through hole and the rotating shaft are sealed through the Tesla valve structure and the thread on the rotating shaft. The application can improve the sealing effect and prolong the practical service life in underwater and deep water operations.

Description

TECHNICAL FIELD

[0001] The present application relates to a sealing structure, in particular a sealing structure based on spiral counter pressure and Tesla valve structure and a speed reducer. BACKGROUND

[0002] Gear reducer is widely used in various industries, thanks to the development of advanced design technology and theoretical research (such as gear strength calculation method, modification technology, deformation calculation, optimization design method, tooth root circle smooth transition, new structure, etc.), the improvement of material technology (various high-quality alloy steel forgings are generally used, the material and heat treatment quality control level is improved), the more reasonable structure design, the improvement of machining precision (ISO 5-6 level), the improvement of bearing and lubricating oil quality and service life, etc. The world speed reducer technology has also been greatly developed.

[0003] At present, the research results of underwater speed reducer are not clear, and some manufacturers of speed reducer at home and abroad make the existing underwater speed reducer poor in stability due to unreasonable application of materials and overall structure, part structure and process design, and more importantly, unreasonable design of sealing structure and selection of sealing material, which leads to poor sealing performance and short service life of the product. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a sealing structure and speed reducer based on spiral counter pressure and Tesla valve structure, which can improve the sealing effect and improve the practical service life in underwater and deep water operation.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a sealing structure based on spiral counter pressure and Tesla valve structure,

[0006] The sealing structure comprises a housing, a rotating shaft mounted on the housing, and a transmission assembly arranged in the housing, the rotating shaft is matched with the transmission assembly to output or obtain driving force;

[0007] A through hole for matching the rotating shaft is arranged on the housing, a thread is arranged on the side surface of the rotating shaft corresponding to the through hole, and the liquid pushing force is provided outside the housing through the through hole when the rotating shaft rotates;

[0008] A plurality of annular first arc recesses are arranged on the side surface of the rotating shaft corresponding to the through hole, the arc recesses are coaxially arranged with the rotating shaft, a plurality of second arc recesses matched with the first arc recesses are arranged on the hole wall of the through hole, the second arc recesses are annular and coaxially arranged with the through hole; a plurality of the first arc recesses and the second arc recesses form a Tesla valve structure, and the Tesla valve structure is closer to the outer opening of the through hole on the housing relative to the thread on the rotating shaft;

[0009] The reverse flow direction of the Tesla valve structure is the direction from the through hole corresponding to the outside of the shell to the inside of the shell, and the through hole and the rotating shaft are sealed by the Tesla valve structure and the thread on the rotating shaft.

[0010] As a further improvement of the application, the thread on the rotating shaft is a rectangular thread, the outer diameter surface of the thread is a plane, and abuts against the inner wall of the through hole.

[0011] As a further improvement of the application, the shell comprises a main shell and a rubber layer arranged in the main shell, the through hole penetrates the main shell and the rubber layer to the inside of the main shell, the second arc-shaped recess is located on the rubber layer, and the thread on the rotating shaft abuts against the inner wall of the rubber layer; the transmission assembly is located in the main shell.

[0012] As a further improvement of the application, the shell is provided with a fitting groove with a diameter larger than that of the through hole at the end corresponding to the through hole, the groove bottom of the fitting groove is in communication with the through hole; a bellows is coaxially arranged on the rotating shaft at a position corresponding to the fitting groove, one end of the bellows abuts against the groove bottom of the fitting groove, and the other end abuts against the side surface of the rotating shaft, and the bellows is mounted on the rotating shaft by a check ring.

[0013] As a further improvement of the application, when the bellows is mounted on the rotating shaft and the fitting groove by the check ring, the bellows is in a compressed state and accumulates elastic potential energy.

[0014] As a further improvement of the application, a sealing ring is arranged at the position where the bellows abuts against the rotating shaft and / or the position where the bellows abuts against the groove bottom of the fitting groove.

[0015] As a further improvement of the application, a sealing ring is arranged at the position where the through hole is closer to the inside of the shell than the thread, the sealing ring is embedded in the inner wall of the through hole, and forms a sealing fit with the side surface of the rotating shaft.

[0016] A reducer based on spiral counterpressure and Tesla valve structure, which has the sealing structure of any one of the improved solutions described above.

[0017] The liquid in the present application is first limited by the three-dimensional Tesla valve structure, greatly reducing the amount and flow rate of liquid infiltration, and the thread arranged on the surface of the rotating shaft forms a spiral counterstructure. When the rotating shaft rotates, the rotation of the thread pushes the liquid outward, preventing the liquid from entering the inside of the shell, and using the counterforce generated by the rotation of the thread to limit the liquid outside the transmission assembly, forming a sealing fit. This sealing fit can greatly improve the sealing effect when used underwater and in deep water, greatly alleviating the problem of water infiltration caused by water pressure. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the application.

[0019] Figure 2 Enlarged view of the sealing structure part of the present application;

[0020] Figure 3 Schematic view of the housing structure of the present application;

[0021] Figure 4 Schematic view of the rotating shaft structure of the present application.

[0022] Corresponding reference signs: 1, housing; 11, main housing; 12, rubber layer; 13, assembly groove; 14, through hole; 111, second arc-shaped recess; 2, rotating shaft; 21, thread; 22, first arc-shaped recess; 3, transmission assembly; 4, bellows; 5, check ring; 6, sealing ring. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0024] Referring to Figures 1-4 the drawings,

[0025] A sealing structure based on spiral counter-pressure and Tesla valve structure,

[0026] including a housing 1, a rotating shaft 2 mounted on the housing 1, and a transmission assembly 3 arranged in the housing 1, the rotating shaft 2 cooperating with the transmission assembly 3 to output or obtain driving force;

[0027] The housing 1 is provided with a through hole 14 for cooperating with the rotating shaft 2 to be rotatably connected, and the side surface of the rotating shaft 2 corresponding to the through hole 14 is provided with a thread 21, for providing liquid pushing force outside the housing 1 through the through hole 14 when the rotating shaft 2 rotates;

[0028] The position of the rotating shaft 2 corresponding to the through hole 14 is further provided with a plurality of annular first arc-shaped recesses 22, which are coaxially arranged with the rotating shaft 2, and the hole wall of the through hole 14 is further provided with a plurality of second arc-shaped recesses 111 cooperating with the first arc-shaped recesses 22, which are annular and coaxially arranged with the through hole 14; the plurality of first arc-shaped recesses 22 and the second arc-shaped recesses 111 form a Tesla valve structure, which is closer to the outer opening of the through hole 14 on the housing 1 relative to the thread 21 on the rotating shaft 2;

[0029] The counter-flow direction of the Tesla valve structure is from the outside of the housing 1 corresponding to the through hole 14 to the inside of the housing 1, and the through hole 14 and the rotating shaft 2 form a seal through the Tesla valve structure and the thread 21 on the rotating shaft 2.

[0030] In the scheme, the first arc-shaped recesses 22 on the surface of the rotating shaft 2 and the second arc-shaped recesses 111 on the inner wall of the through hole 14 are distributed in a staggered manner, as shown in the figure, to form a Tesla valve structure. The Tesla valve structure is a three-dimensional structure and is annularly distributed on the rotating shaft 2 and the inner wall of the through hole 14 to form a three-dimensional Tesla valve.

[0031] Based on the structure, the thread 21 arranged on the surface of the rotating shaft 2 forms a spiral thrust structure. When the rotating shaft 2 rotates, the rotation of the thread 21 pushes the liquid outward from the housing 1, which can prevent the liquid from entering the inside of the housing 1. In the scheme, the liquid is first limited by the three-dimensional Tesla valve structure, which greatly reduces the amount and flow rate of the liquid infiltration. The thrust force generated by the rotation of the thread 21 is used to limit the liquid outside the transmission assembly 3 to form a sealing fit. This sealing fit can greatly improve the sealing effect when used underwater and in deep water, greatly alleviating the problem of water infiltration caused by water pressure.

[0032] In order to make the thread 21 and the inner wall of the through hole 14 cooperate better, the thread 21 on the rotating shaft 2 is a rectangular thread 21, the outer diameter surface of the thread 21 is a flat surface, and the flat surface abuts against the inner wall of the through hole 14.

[0033] The outer diameter surface of the rectangular thread 21 is a flat surface, so it can better cooperate with the inner wall of the through hole 14. The abutting action between the two is easier to cooperate, and the abutting action formed is more stable, ensuring the sealing effect.

[0034] In order to make the processing more convenient, and also to make the sealing effect better, the housing 1 includes a main housing 11 and a rubber layer 12 arranged in the main housing 11. The through hole 14 penetrates the main housing 11 and the rubber layer 12 to the inside of the main housing 11. The second arc-shaped recesses 111 are all located on the rubber layer 12, and the thread 21 on the rotating shaft 2 abuts against the inner wall of the rubber layer 12. The transmission assembly 3 is located in the main housing 11.

[0035] The second arc-shaped recesses 111 are located on the rubber layer 12, which means that the rubber layer 12 can be processed separately. Moreover, since the second arc-shaped recesses 111 are located inside the through hole 14, it is difficult to directly process the through hole 14 of the housing 1. The rubber layer 12 can be pre-processed and then installed into the housing 1, so that the effect of convenient processing can be achieved. In addition, since the thread 21 on the rotating shaft 2 needs to abut against the inner wall of the through hole 14 to achieve better sealing, the rubber layer 12 can naturally form the function of the sealing ring 6. The sealing effect formed by the cooperation of the rubber layer 12 and the radial surface of the thread 21 is better, the naturally formed liquid thrust effect is also better, and the sealing effect formed by the cooperation of the Tesla valve structure is also improved.

[0036] In order to further improve the sealing effect and form multi-stage sealing effect, the shell 1 is provided with a fitting groove 13 with a diameter larger than the through hole 14 at the end corresponding to the outer end of the through hole 14, and the groove bottom of the fitting groove 13 is communicated with the through hole 14; the wave tube 4 is coaxially arranged on the rotating shaft 2 at the position corresponding to the fitting groove 13, one end of the wave tube 4 abuts against the groove bottom of the fitting groove 13, and the other end abuts against the side surface of the rotating shaft 2, and the wave tube 4 is installed on the rotating shaft 2 through the stop ring 5.

[0037] In the scheme, the wave tube 4 is used to form sealing, the wave tube 4 abuts against the groove bottom of the fitting groove 13, which can limit the liquid from entering the through hole 14 from the groove bottom of the fitting groove 13, and the wave tube 4 abuts against the rotating shaft 2 at one end corresponding to the rotating shaft 2, which limits the liquid from entering between the wave tube 4 and the rotating shaft 2. The wave tube 4 is installed on the rotating shaft 2 through the stop ring 5, which can limit the wave tube 4 from coming out and keep the wave tube 4 and the groove bottom of the fitting groove 13 in sealing effect. The part of the wave tube 4 abutting against the groove bottom of the fitting groove 13 and the part abutting against the rotating shaft 2 can be provided with a sealing ring 6, which can increase the sealing effect.

[0038] According to the setting requirements, the wave tube 4 can rotate with the rotating shaft 2, or the wave tube 4 can be fixed and the rotating shaft 2 can rotate relative to the wave tube 4.

[0039] In order to keep the wave tube 4 in long-term sealing effect, when the wave tube 4 is installed on the rotating shaft 2 and the fitting groove 13 through the stop ring 5, the wave tube 4 is in a compressed state and accumulates elastic potential energy.

[0040] The wave tube 4 is in a compressed state and accumulates elastic potential energy, which can use the elastic potential energy to keep the wave tube 4 and the groove bottom of the fitting groove 13 in abutting state when the part of the wave tube 4 abutting against the groove bottom of the fitting groove 13 is worn, and keep the sealing effect. This effect is particularly obvious in the scheme that the wave tube 4 rotates with the rotating shaft 2, and in the scheme that the wave tube 4 and the rotating shaft 2 rotate together, the part of the wave tube 4 abutting against the rotating shaft 2 can keep good sealing effect and will not be worn due to relative rotation, and the part of the wave tube 4 corresponding to the groove bottom of the fitting groove 13 can compensate for wear through elastic potential energy.

[0041] In a further setting, the sealing ring 6 is embedded in the inner wall of the through hole 14 and forms a sealing fit with the side surface of the rotating shaft 2 at a position closer to the inside of the shell 1 relative to the thread 21.

[0042] Since the structure of the scheme can keep better sealing effect when the rotating shaft 2 is in a rotating state, the sealing ring 6 is used to supplement the sealing effect when the rotating shaft 2 is not working, so that the rotating shaft 2 can also achieve good sealing effect without rotating.

[0043] The above describes a sealing structure, but in use can also be applied in a speed reducer, especially in a speed reducer for underwater operation. Of course, it can also be in other devices with the structure of the rotating shaft 2.

[0044] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-described embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A sealing structure based on screw counter-pressure and Tesla valve structure, characterized in that it comprises a housing, a rotating shaft mounted on the housing, and a transmission assembly arranged in the housing, the rotating shaft cooperating with the transmission assembly to output or obtain driving force. A through hole is arranged on the housing for connecting the rotating shaft in rotation, the side surface of the rotating shaft corresponding to the through hole is provided with threads for providing liquid pushing force outside the housing through the through hole when the rotating shaft rotates. A plurality of annular first arc-shaped recesses are arranged on the side surface of the rotating shaft corresponding to the position of the through hole, the arc-shaped recesses are coaxially arranged with the rotating shaft, a plurality of second arc-shaped recesses are arranged on the hole wall of the through hole corresponding to the first arc-shaped recesses, the second arc-shaped recesses are annular and coaxially arranged with the through hole, the first arc-shaped recesses and the second arc-shaped recesses form a Tesla valve structure, and the Tesla valve structure is closer to the outer opening of the through hole on the housing relative to the threads on the rotating shaft. The counter-flow direction of the Tesla valve structure is from the outside of the housing corresponding to the through hole to the inside of the housing, and the through hole and the rotating shaft are sealed by the Tesla valve structure and the threads on the rotating shaft. The threads on the rotating shaft are rectangular threads, the outer diameter surface of the threads is a flat surface, and the flat surface abuts against the inner wall of the through hole. The housing comprises a main housing and a rubber layer arranged in the main housing, the through hole penetrates the main housing and the rubber layer to the inside of the main housing, the second arc-shaped recesses are all located on the rubber layer, and the threads on the rotating shaft abut against the inner wall of the rubber layer; the transmission assembly is located in the main housing. The end of the housing corresponding to the through hole is provided with a fitting groove with a diameter larger than that of the through hole, the groove bottom of the fitting groove is in communication with the through hole; a bellows is coaxially arranged with the rotating shaft at the position of the fitting groove on the rotating shaft, one end of the bellows abuts against the groove bottom of the fitting groove, and the other end abuts against the side surface of the rotating shaft, and the bellows is mounted on the rotating shaft by a check ring.

2. The seal structure of claim 1, wherein When the bellows is mounted on the rotating shaft and the fitting groove by the check ring, the bellows is in a compressed state and accumulates elastic potential energy.

3. The seal structure of claim 2, wherein A sealing ring is arranged at the position where the bellows abuts against the rotating shaft and / or the position where the bellows abuts against the groove bottom of the fitting groove.

4. The seal structure of claim 3, wherein A sealing ring is arranged at the position of the through hole closer to the inside of the housing relative to the threads, the sealing ring is embedded in the inner wall of the through hole and forms a sealing cooperation with the side surface of the rotating shaft.

5. The seal structure of claim 1, wherein The reducer is provided with the sealing structure according to any one of claims 1-5.

6. A decelerator based on the screw counter-pressure and Tesla valve structure, characterized by, ​

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