Multi-stage speed reduction rotary sealing mechanism

Abstract

The multi-stage speed reduction rotary sealing mechanism comprises a static pipe, a box body, a rotary pipe, a speed reduction pipe assembly connecting the static pipe and the rotary pipe and a rotating speed distribution shaft, the speed reduction pipe assembly is formed by sequentially and rotationally sleeving a plurality of speed reduction sleeves, and the speed reduction pipe assembly and the rotating speed distribution shaft are both rotationally arranged in the box body; the outer walls of the speed reduction sleeves and the rotating pipe are sleeved with speed reduction wheels, the speed reduction wheels are in transmission connection with the rotating speed distribution shaft, the transmission ratio of the speed reduction wheels to the rotating speed distribution shaft is sequentially reduced from one side of the rotating pipe to one side of the static pipe, and the rotating pipe drives the rotating speed distribution shaft to rotate so as to drive the speed reduction sleeves to form differential rotation. According to the multi-stage speed reduction rotary sealing mechanism, from the perspective of reducing the relative rotating speed of the sealing assembly, the abrasion loss and heat damage of the sealing assembly are reduced, and the service life of the device is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary seals, and in particular relates to a multi-stage reduction rotary seal mechanism. Background Art

[0002] Rotary sealing mechanism is a common sealing mechanism in industrial production and daily life. Its main purpose is to complete the fluid sealing inside the mechanism while realizing dynamic and static separation. Currently, commonly used rotary seals include packing seals, expansion ring seals, mechanical seals, equal contact seals, floating seals, labyrinth seals and other non-contact sealing forms. Generally, the contact sealing structure has a higher pressure resistance than the non-contact sealing structure. Therefore, in some working conditions with high sealing pressure, contact seals are often used as the main seals of components.

[0003] However, in some high temperature and high pressure environments, the failure and life problems of rotary seals are particularly significant, which poses a hidden danger to the efficient operation and production safety of the equipment. The main factors for the failure of rotary seals are the wear failure of the sealing mechanism and the thermal damage to the seals caused by frictional heat, which directly affects the service life of the rotary sealing mechanism. Summary of the invention

[0004] In view of the above problems, the present invention proposes a multi-stage reduction rotary sealing mechanism, comprising: a stationary tube, a housing, a rotary tube, a reduction tube assembly connecting the stationary tube and the rotary tube, and a speed distribution shaft;

[0005] The reduction tube assembly and the speed distribution shaft are both rotatably arranged inside the box. The reduction tube assembly is composed of a number of reduction sleeves that are coaxially arranged and rotatably sleeved in sequence. The outer walls of the reduction sleeve and the rotating tube are sleeved with reduction wheels, and the number of reduction wheels are all in transmission connection with the speed distribution shaft.

[0006] The transmission ratio of the plurality of reduction wheels and the speed distribution shaft decreases from the rotating tube side to the stationary tube side. The rotating tube drives the speed distribution shaft to rotate, and then drives the plurality of reduction sleeves to form differential rotation.

[0007] Furthermore, the speed distribution shaft includes a rotating shaft and several transmission wheels sleeved on the outer wall of the rotating shaft. Both ends of the rotating shaft are rotatably connected to the inner wall of the box body. The outer walls of the transmission wheel and the reduction wheel are provided with teeth so that the several transmission wheels correspond one by one to form a meshing with the several reduction gears.

[0008] Furthermore, the transmission ratios of the reduction wheel and the corresponding transmission wheel decrease successively from the rotating tube side to the stationary tube side, and the differences are equal.

[0009] Furthermore, shaft seats are symmetrically provided on the front and rear inner walls of the box body, bearings are fixedly installed on the inner walls of the shaft seats, and the inner rings of the bearings on both sides are respectively sleeved with the outer walls at both ends of the rotating shaft.

[0010] Furthermore, a coaxially arranged outer ring groove is formed on the outer wall of one end of the reduction sleeve, an inner ring groove matching the outer ring groove is formed on the inner wall of the other end of the reduction sleeve, and inner ring grooves and outer ring grooves are formed on the ends of the stationary tube and the rotating tube respectively.

[0011] Furthermore, a sealing ring groove is provided on the inner wall of the inner ring groove, a sealing ring gasket is sleeved and installed on the inner wall of the sealing ring groove, and the inner ring of the sealing ring gasket is sleeved with the outer wall of the outer ring groove.

[0012] Furthermore, the box body includes a shell and a cover, the shell and the cover are detachably connected by bolts, one end of the stationary tube passes through the shell and is connected to one end of the reduction tube assembly, and one end of the rotating tube passes through the cover and is connected to the other end of the reduction tube assembly.

[0013] Furthermore, the gaps between the inner wall of the box and the side walls of the transmission wheel and the reduction wheel are kept consistent.

[0014] Furthermore, a first through hole is formed on the side wall of the housing and penetrated by the stationary tube, and a sealing ring is embedded in the inner wall of the first through hole;

[0015] The inner wall of the cover body is provided with a second through hole penetrated by the rotating tube, and the inner wall of the cover body is provided with an oil seal at the side of the second through hole.

[0016] Furthermore, it also includes a snap-on key block, the outer wall of the reduction sleeve is provided with a first key groove, the outer wall of the reduction wheel is correspondingly provided with a second key groove, and the first key groove and the second key groove are connected by the snap-on key block.

[0017] Compared with the prior art, the embodiments of the present invention have at least the following advantages:

[0018] 1. The present invention proposes a multi-stage reduction rotary sealing mechanism, which starts from the perspective of reducing the relative rotational speed of the sealing component, thereby reducing the wear and heat damage of the sealing component. The reduction tube assembly is rotationally sleeved with the stationary tube and the rotating tube, so that the reduction tube assembly becomes a speed buffer between the rotating tube and the stationary tube, avoiding the rotating tube and the stationary tube from directly forming a rotationally sleeved relationship. The reduction difference is divided by a plurality of reduction sleeves with gradually reduced rotational speeds, which directly reduces the wear and heat between adjacent rotating parts, and fundamentally extends the service life of the device.

[0019] 2. Rotating sleeves are formed between the two ends of the speed reducer tube assembly and the ends of the stationary tube and the rotating tube extending into the chamber to connect the pipeline between the stationary tube and the rotating tube. While ensuring the normal operation of the pipeline, the sleeve and the sealing ring ensure the sealing of the pipeline itself, avoiding leakage of fluid in the pipeline.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a multi-stage reduction rotary sealing mechanism in an embodiment of the present invention is shown;

[0023] Figure 2 A schematic diagram of the internal structure of a multi-stage reduction rotary sealing mechanism in an embodiment of the present invention is shown;

[0024] Figure 3 A side cross-sectional schematic diagram of a multi-stage reduction rotary sealing mechanism in an embodiment of the present invention is shown;

[0025] Figure 4 An enlarged schematic diagram of structure A in an embodiment of the present invention is shown.

[0026] In the figure, the stationary tube 1, the box body 2, the shell body 21, the cover body 22, the reduction tube assembly 3, the reduction sleeve 31, the first reduction tube 311, the second reduction tube 312, the sealing ring gasket 32, the rotating tube 4, the speed distribution shaft 5, the rotating shaft 51, the transmission wheel 52, the first transmission gear 521, the second transmission gear 522, the third transmission gear 523, the bearing 53, the reduction wheel 6, the first reduction gear 61, the second reduction gear 62, the third reduction gear 63, the sealing ring 7, the oil seal 8, the clamping key block 9, the first key groove 10, and the second key groove 11. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present invention and features of different embodiments or examples without contradiction.

[0029] The present invention provides a multi-stage reduction rotary sealing mechanism. Figure 1 FIG. 1 is a schematic diagram showing a multi-stage reduction rotary sealing mechanism in an embodiment of the present invention. Figure 1 In the multi-stage reduction rotary sealing mechanism, the mechanism comprises: a stationary tube 1, a housing 2, a reduction tube assembly 3, a rotating tube 4, and a speed distribution shaft 5;

[0030] The speed reducing tube assembly 3 connects the stationary tube 1 and the rotating tube 4 to form a complete pipeline. A chamber is opened inside the box 2. The speed reducing tube assembly 3 and the speed distribution shaft 5 are both rotatably arranged in the chamber. The speed distribution shaft 5 and the speed reducing tube assembly 3 are placed adjacent to each other in the chamber. The stationary tube 1 and the rotating tube 4 are arranged on both sides of the chamber respectively. The two ends of the speed reducing tube assembly 3 are respectively rotatably sleeved with the ends of the stationary tube 1 and the rotating tube 4 extending into the chamber. Figure 1 It can be seen that one end of the stationary pipe 1 is inserted into the box body 2 from the front side of the box body 2, and is rotatably sleeved with one end of the reduction tube assembly 3, and one end of the rotating pipe 4 is inserted into the box body 2 from the rear side of the box body 2, and is rotatably sleeved with the other end of the reduction tube assembly 3, so as to connect the pipeline between the stationary pipe 1 and the rotating pipe 4;

[0031] In the present application, the fixed tube and rotating tube, the stationary tube 1, the speed reducing tube assembly 3, and the rotating tube 4 of the equipment are all hollow in design, and the inner diameters of each are consistent, so that the fixed tube and rotating tube, the stationary tube 1, the speed reducing tube assembly 3, and the rotating tube 4 of the equipment together form a pipeline with consistent inner diameter to ensure the smoothness of the fluid flow in the pipeline and avoid the occurrence of fluid velocity changes due to changes in the caliber.

[0032] The reduction tube assembly 3 is composed of a plurality of reduction sleeves 31 coaxially arranged and rotated in sequence, and can be composed of two, three, four or other number of reduction sleeves 31, and the present application does not make specific restrictions here. The outer walls of the reduction sleeve 31 and the rotating tube 4 are both sleeved with a reduction wheel 6, that is, the outer wall of the rotating tube 4 is sleeved with a reduction wheel 6, and the outer wall of each reduction sleeve 31 is also sleeved with a reduction wheel 6, and the plurality of reduction wheels 6 are all in transmission connection with the speed distribution shaft 5.

[0033] Both ends of the speed distribution shaft 5 are rotatably connected to the inner wall of the casing 2 to ensure that the speed distribution shaft 5 can rotate relative to the casing 2. Several reduction wheels 6 are transmission-connected with the speed distribution shaft 5, so that the speed distribution shaft 5 and the reduction tube assembly 3 are linked, and the transmission ratio of the several reduction wheels 6 to the speed distribution shaft 5 decreases from the rotating tube 4 side to the stationary tube 1 side. It should be noted that the above transmission ratio represents the ratio of the angular velocities of the two rotating components in the mechanism, also known as the speed ratio. In the present embodiment, it represents the ratio of the angular velocities of the reduction wheel 6 and the speed distribution shaft 5.

[0034] On the basis that the speed distribution shaft 5 can only generate a single speed, with the reduction of the transmission ratio, the speed of the several reduction wheels 6 from the rotating tube 4 side to the stationary tube 1 side is gradually reduced, so that a speed difference is formed between adjacent reduction wheels 6, and the speed difference between adjacent reduction wheels 6 is smaller than the speed difference between the rotating tube 4 and the stationary tube 1, thereby realizing multi-stage reduction.

[0035] It should be noted that, in the present application, there is no restriction on the transmission connection between the plurality of reduction wheels 6 and the speed distribution shaft 5, but it is not limited to the transmission connection between the speed distribution shaft 5 by means of a transmission belt, a transmission chain, a gear, etc. Figure 1 In the present application, the rotation speeds of several reduction wheels 6 are changed by changing the pitch circle diameters of the reduction wheels 6 while keeping the pipeline aperture unchanged and the rotation speed distribution shaft 5 being able to generate only a single rotation speed. However, when using a transmission chain, gears, etc., the rotation speed of the reduction wheel 6 can also be changed by adjusting the number of holes or teeth on the transmission chain or gears, thereby achieving the effect of several reduction sleeves 31 having different rotation speeds driven by a single rotation speed distribution shaft 5.

[0036] The stationary tube 1, the speed reducing tube assembly 3 and the rotating tube 4 of the present application are coaxially arranged and are rotationally sleeved adjacent to each other in sequence, that is, one end of the stationary tube 1 is fixedly connected to the fixed tube end of the device and keeps a fixed state, the other end of the stationary tube 1 is rotationally sleeved to one end of the speed reducing tube assembly 3, the other end of the speed reducing tube assembly 3 is rotationally sleeved to one end of the rotating tube 4, and the other end of the rotating tube 4 is fixedly connected to the rotating tube end of the device, so that the rotating tube 4 can rotate synchronously with the rotating tube of the device.

[0037] The present invention starts from the perspective of reducing the relative rotation speed between the sealing components, thereby reducing the wear and thermal damage of the sealing components. The reduction tube assembly 3 is rotationally sleeved with the stationary tube 1 and the rotating tube 4, so that the reduction tube assembly 3 becomes a speed buffer between the rotating tube 4 and the stationary tube 1, avoiding the rotating tube 4 and the stationary tube 1 from directly forming a rotationally sleeved relationship, and the complete speed difference between the rotating tube 4 and the stationary tube 1 is divided by a plurality of reduction sleeves 31 and a speed distribution shaft 5. The sum of the speed differences between adjacent reduction sleeves 31 at each level is the speed difference between the rotating tube 4 and the stationary tube 1, thereby directly reducing the wear and heat generation between adjacent rotating parts, and fundamentally extending the service life of the entire device.

[0038] In order to ensure the stability of the transmission connection between the plurality of reduction wheels 6 and the speed distribution shaft 5, the speed distribution shaft 5 includes a rotating shaft 51 and a plurality of transmission wheels 52 sleeved on the outer wall of the rotating shaft 51. Both ends of the rotating shaft 51 are rotatably connected to the inner wall of the casing 2. Correspondingly, the outer walls of the transmission wheels 52 and the reduction wheels 6 are provided with teeth, so that the plurality of transmission wheels 52 are meshed with the plurality of reduction gears 6 in a one-to-one correspondence. On the basis that the transmission ratio of the plurality of reduction wheels 6 and the speed distribution shaft 5 decreases from the rotating tube 4 side to the stationary tube 1 side, the pitch circle diameters of the plurality of reduction wheels 6 decrease from the stationary tube 1 side to the rotating tube 4 side, and the pitch circle diameters of the plurality of transmission wheels 52 increase from the stationary tube 1 side to the rotating tube 4 side. On the basis of the same gear module, the tightness of the connection between the plurality of reduction wheels 6 and the speed distribution shaft 5 is improved.

[0039] Furthermore, the transmission ratio of the reduction wheel 6 and the corresponding transmission wheel 52 decreases successively from the rotating tube 4 side to the stationary tube 1 side, and the difference is equal, so as to ensure that a fixed and equal speed difference is obtained between adjacent reduction sleeves 31, so that the speed difference of adjacent reduction wheels 6 is equal and fixed, thereby realizing multi-stage equal-difference reduction efficiency.

[0040] refer to Figure 3 An outer ring groove arranged coaxially is provided on the outer wall of one end of the reduction sleeve 31, and the outer ring groove extends from the end port of the reduction sleeve 31 to the other end to form an annular structure, and an inner ring groove matching the outer ring groove is provided on the inner wall of the other end of the reduction sleeve 31, and the end port of the inner ring groove reduction sleeve 31 extends to one end of the outer ring groove to form an annular structure, and the inner ring groove and the outer ring groove are respectively provided at the ends of the stationary tube 1 and the rotating tube 4.

[0041] exist Figure 3In the example shown, an outer ring groove is provided on the outer wall of the left end of the reduction sleeve 31, and an inner ring groove is provided on the inner wall of the right end of the reduction sleeve 31. Similarly, an inner ring groove is provided on the inner wall of the right end of the stationary tube 1, and an outer ring groove is provided on the outer wall of the left end of the rotating tube 4. The inner ring groove of the stationary tube 1 is matched with the outer ring groove of the reduction sleeve 31, and the outer ring groove of the rotating tube 4 is matched with the inner ring groove of the reduction sleeve 31, so that the stationary tube 1, the reduction tube assembly 3, and the rotating tube 4 can form a rotating sleeve connection in sequence. On the basis of ensuring the coaxial arrangement of the three, the connection surface between adjacent components is increased, thereby improving the firmness of the connection between adjacent components.

[0042] At the same time, in order to ensure the stability of the rotational socket connection of the three, a sealing ring groove is opened on the inner wall of the inner ring groove, and a sealing ring gasket 32 ​​is socketed and installed on the inner wall of the sealing ring groove. The inner circle of the sealing ring gasket 32 ​​is socketed with the outer wall of the outer ring groove. The sealing ring groove and the port of the inner ring groove maintain a certain distance, and the sealing ring gasket 32 ​​is limited by the side wall of the sealing ring groove, so that the sealing ring gasket 32 ​​is always located in the inner ring groove to prevent the sealing ring gasket 32 ​​from falling off from the inner ring groove.

[0043] After the stationary tube 1, the rotating tube 4 and the speed reducing tube assembly 3 are mutually sleeved, the sealing ring gasket 32 ​​will be compressed and installed in the sealing ring groove, and an extrusion force will be generated on the outer wall of the outer ring groove and the inner wall of the inner ring groove at the same time, so as to further seal the pipeline formed by the stationary tube 1, the rotating tube 4 and the speed reducing tube assembly 3, and avoid leakage of the fluid in the pipeline.

[0044] refer to Figure 3 The front and rear inner walls of the box body 2 are symmetrically provided with shaft seats, and bearings 53 are fixedly installed on the inner walls of the shaft seats. The inner rings of the bearings 53 on both sides are respectively sleeved with the outer walls of the two ends of the rotating shaft 51, so as to limit the positions of the two ends of the rotating shaft 51 while ensuring the rotation of the rotating shaft 51.

[0045] In this embodiment, the box body 2 includes a shell 21 and a cover 22. The shell 21 and the cover 22 are detachably connected by bolts, which are convenient for disassembly for later maintenance. Other connection methods such as snaps can also be used. One end of the stationary tube 1 passes through the shell 21 and is connected to one end of the speed reduction tube assembly 3. One end of the rotating tube 4 passes through the cover 22 and is connected to the other end of the speed reduction tube assembly 3.

[0046] The cross-section of the shell 21 and the cover 22 adopts an 8-shaped structure, and the gap between the inner wall of the box body 2 and the transmission wheel 52 and the reduction wheel 6 is consistent, which reduces the overall volume of the box body 2 and reduces the overall weight of the box body 2. At the same time, since the gap between the inner wall of the box body 2 and the side wall of the transmission wheel 52 and the reduction wheel 6 is consistent, the size of the internal transmission wheel 52 and the reduction wheel 6 can be directly judged by the appearance of the box body 2, which is convenient for selection and classification and convenient for use in harsh environments.

[0047] In actual use, the chamber of the box body 2 is filled with lubricating oil or grease, etc., so as to facilitate the meshing connection between the reduction wheel 6 and the transmission wheel 52. A first through hole penetrated by the stationary tube 1 is opened on the side wall of the housing 21, and a sealing ring 7 is embedded in the inner wall of the first through hole. The sealing ring 7 is squeezed between the inner wall of the first through hole and the outer wall of the stationary tube 1 to seal the gap between the two.

[0048] The inner wall of the cover body 22 is provided with a second through hole penetrated by the rotating tube 4, and the inner wall of the cover body 22 is provided with an oil seal 8 on the side of the second through hole to ensure the sealing of the internal chamber of the box body 2, avoid leakage of lubricating oil inside the chamber, and avoid contamination of the chamber by the external environment, thereby improving the overall service life of the device of the present application.

[0049] refer to Figure 4 The multi-stage reduction rotary sealing mechanism of the present application also includes a snap-in key block 9. The outer wall of the reduction sleeve 31 is provided with a first key groove 10, and the reduction wheel 6 is correspondingly provided with a second key groove 11. The first key groove 10 and the second key groove 11 are connected through the snap-in key block 9 to ensure that the reduction sleeve 31 and the reduction wheel 6 sleeved on the outer wall of the reduction sleeve 31 keep rotating synchronously, and facilitate the replacement of the reduction wheel 6, and facilitate the replacement of the later configuration mode; at the same time, in order to avoid the upper and lower ends of the snap-in key block 9 from being misaligned during the installation process, the cross-sections of the first key groove 10 and the second key groove 11 in the present application adopt different shapes, and the corresponding upper and lower ends of the snap-in key block 9 are also formed differently, which is convenient for identification and improves the production efficiency of the reduction mechanism of the present application.

[0050] Example 1, reference Figure 2 and Figure 3 In order to illustrate the device of the present application, it is assumed that the reduction tube assembly 3 includes two reduction sleeves 31, wherein the outer walls of the two corresponding reduction sleeves 31 are respectively sleeved with a reduction wheel 6, the outer wall of the rotating tube 4 is also sleeved with a reduction wheel 6, and the corresponding speed distribution shaft 5 includes a rotating shaft 51 and three transmission wheels 52 sleeved with the outer wall of the rotating shaft 51;

[0051] The three transmission wheels 52 mesh with the three reduction wheels 6 in a one-to-one correspondence, and the pitch circle diameters of the three reduction wheels 6 increase sequentially from the rotating tube 4 side to the stationary tube 1 side.

[0052] The rotation speed of the rotating tube 4 is divided into three stages by means of the three transmission wheels 52 and the corresponding three reduction wheels 6 .

[0053] For the sake of convenience of explanation, the three reduction wheels 6 can be set as the first reduction gear 61, the second reduction gear 62, and the third reduction gear 63 from left to right. It is worth noting that the third reduction gear 63 is sleeved on the outer wall of the rotating tube 4; the three transmission wheels 52 are set as the first transmission gear 521, the second transmission gear 522, and the third transmission gear 523 from left to right; the two reduction sleeves 31 are set as the first reduction tube 311 and the second reduction tube 312 from left to right.

[0054] During the actual operation, due to the rotation of the rotating tube 4, the third reduction gear 63 is driven to rotate synchronously, and the third reduction gear 63 drives the third transmission gear 523 meshing with it to rotate, and the third transmission gear 523 drives the rotating shaft 51 and the first transmission gear 521 and the second transmission gear 522 to rotate synchronously, and the first transmission gear 521 and the second transmission gear 522 drive the first reduction gear 61 and the second reduction gear 62 meshing with them one by one to rotate.

[0055] Since the present embodiment adopts gear meshing connection, on the basis of the same module of the meshing gears, the transmission ratio of the plurality of reduction wheels 6 and the speed distribution shaft 5 decreases from the rotating tube 4 side to the stationary tube 1 side, the pitch circle diameters of the first reduction gear 61, the second reduction gear 62, and the third reduction gear 63 used decrease in sequence, and the pitch circle diameters of the first transmission gear 521, the second transmission gear 522, and the third transmission gear 523 increase in sequence, and the first reduction gear 61, the second reduction gear 62, and the third reduction gear 63 are meshed with the first transmission gear 521, the second transmission gear 522, and the third transmission gear 523 in a one-to-one correspondence, so that the rotation speeds of the rotating tube 4, the second reduction tube 312, and the first reduction tube 311 are gradually reduced, thereby achieving the efficiency of three-stage reduction.

[0056] According to the above division of the reduction wheel 6 and the transmission wheel 52, the pitch circle diameter of the first reduction gear 61 can be further set to D 01 , the angular velocity is n 01 , the pitch circle diameter of the second reduction gear 62 is D 02 , the angular velocity is n 02 , the pitch circle diameter of the third reduction gear 63 is D 03 , the angular velocity is n 03 ;

[0057] The pitch circle diameter of the first speed limiting gear 521 is D 11 , the pitch circle diameter of the second speed limiting gear 522 is D 12 , the pitch circle diameter of the third speed limiting gear 523 is D 13Since the gear modules of the first reduction gear 61, the second reduction gear 62, and the third reduction gear 63 that mesh with the first speed limiting gear 521, the second speed limiting gear 522, and the third speed limiting gear 523 are the same, the rotation angular velocity of the first speed limiting gear 521, the second speed limiting gear 522, and the third speed limiting gear 523 is the same, and is set to n 1 .

[0058] According to the principle that the transmission ratio is equal to the ratio of the angular velocities of adjacent gears, and the linear velocities of adjacent gears are equal;

[0059] It can be seen that the rotational speed relationship between the first reduction gear 61 and the first speed limiting gear 521 is:

[0060]

[0061] The rotational speed relationship between the second reduction gear 62 and the second speed limiting gear 522 is:

[0062]

[0063] The rotation speed relationship between the third reduction gear 63 and the third speed limiting gear 523 is:

[0064]

[0065] According to the formula, we can get:

[0066]

[0067] Then, the speed difference between the stationary tube 1 and the first speed reducing tube 311 is:

[0068]

[0069] The speed difference between the first speed reducing tube 311 and the second speed reducing tube 312 is:

[0070]

[0071] The speed difference between the second speed reducing tube 312 and the rotating tube 4 is:

[0072]

[0073] When the speed differences of the three speed levels are set to be equal and each is one third of the total difference;

[0074]

[0075] It can be seen that when the transmission ratio of the third reduction gear 63 and the third transmission gear 523 is hour;

[0076] The transmission ratio of the first reduction gear 61 and the first transmission gear 521 is

[0077] The transmission ratio of the second reduction gear 62 and the second transmission gear 522 is

[0078] That is, the transmission ratio of the three reduction wheels 6 and the three speed distribution shafts 5 decreases from the rotating tube 4 side to the stationary tube 1 side, and when the ratio of the transmission ratio of the three reduction wheels 6 and the three speed distribution shafts 5 from the rotating tube 4 side to the stationary tube 1 side is 3:2:1, the speed difference n between the stationary tube 1 and the first reduction tube 311 is 01 , the speed difference n between the first speed reducing tube 311 and the second speed reducing tube 312 02 -n 01 , the speed difference n between the second speed reducing tube 312 and the rotating tube 4 03 -n 02 are equal and are both one third of the rotation speed difference between the stationary tube 1 and the rotating tube 4.

[0079] It can be known from the Rabinowicz model, the Archard model and the friction heat calculation formula that the theoretical service life of the embodiment designed in the present invention is three times that of the conventional rotary seal under the conditions of the same gear size difference and material.

[0080] Although two reduction sleeves 31 are used as an example for illustrative explanation above, the present device is not limited to the reduction sleeve assembly 3 being composed of multiple reduction sleeves 31, such as three, four, five, etc. Correspondingly, the transmission ratios of the three reduction wheels 6 and the three speed distribution shafts 5 and the proportional relationship between adjacent transmission ratios are limited above, but are not limited to different proportional relationships. Similarly, it is not limited to the transmission form of gears, and can also be in the form of chains, conveyor belts, etc. Those skilled in the art can make comprehensive considerations based on the reduction principle of this mechanism and the actual application situation, as long as the principle of this multi-stage reduction mechanism can be realized.

[0081] How this application works at your institution:

[0082] The rotating tube 4 is fixedly connected with the rotating tube of the equipment so that the rotating tube 4 and the rotating tube always rotate synchronously, and the rotating tube 4 determines the rotational angular velocity of the reduction wheel 6 corresponding to the sleeve of the outer wall of the rotating tube 4, and the rotational angular velocity of the transmission wheel 52 is determined by the transmission ratio of the reduction wheel 6 and the corresponding transmission wheel 52, and then the rotational angular velocity of the rotating shaft 51 is determined; and the speed of other reduction wheels 6 and the transmission ratio of the corresponding transmission wheel 52 are determined. Finally, a state of multi-stage speed sharing is formed to achieve multi-stage speed reduction efficiency.

[0083] In the present application, a rotating sleeve is formed between the two ends of the speed reduction tube assembly 3 and the ends of the stationary tube 1 and the rotating tube 4 extending into the chamber to connect the pipeline between the stationary tube 1 and the rotating tube 4. While ensuring the normal operation of the pipeline, the sealing of the pipeline itself is ensured by the sleeve and the sealing ring gasket 32, avoiding the leakage of fluid in the pipeline.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage reduction rotary sealing mechanism, used to connect a fixed pipe and a rotating pipe of a device, characterized in that: include: A stationary tube (1), a housing (2), a rotating tube (4), a speed reducing tube assembly (3) connecting the stationary tube (1) and the rotating tube (4), and a speed distribution shaft (5); The deceleration tube assembly (3) and the speed distribution shaft (5) are both rotatably arranged inside the housing (2); the deceleration tube assembly (3) is composed of a plurality of deceleration sleeves (31) which are coaxially arranged and sequentially rotatably sleeved; the outer walls of the deceleration sleeves (31) and the rotating tube (4) are sleeved with deceleration wheels (6); and the plurality of deceleration wheels (6) are all in transmission connection with the speed distribution shaft (5); The transmission ratio between the plurality of reduction wheels (6) and the rotation speed distribution shaft (5) decreases from the rotating tube (4) side to the stationary tube (1) side. The rotating tube (4) drives the rotation speed distribution shaft (5) to rotate, thereby driving the plurality of reduction sleeves (31) to form differential rotation.

2. The multi-stage reduction rotary sealing mechanism according to claim 1, characterized in that: The speed distribution shaft (5) comprises a rotating shaft (51) and a plurality of transmission wheels (52) sleeved on the outer wall of the rotating shaft (51); both ends of the rotating shaft (51) are rotatably connected to the inner wall of the box body (2); the outer walls of the transmission wheel (52) and the reduction wheel (6) are provided with teeth, so that the plurality of transmission wheels (52) are meshed with the plurality of reduction gears (6) in a one-to-one correspondence.

3. The multi-stage reduction rotary sealing mechanism according to claim 2, characterized in that: The transmission ratio of the reduction wheel (6) and the corresponding transmission wheel (52) decreases from the rotating tube (4) side to the stationary tube (1) side, and the difference is equal.

4. The multi-stage reduction rotary sealing mechanism according to claim 2, characterized in that: The front and rear inner walls of the box body (2) are symmetrically provided with shaft seats, and bearings (53) are fixedly installed on the inner walls of the shaft seats. The inner rings of the bearings (53) on both sides are respectively sleeved with the outer walls at both ends of the rotating shaft (51).

5. The multi-stage reduction rotary sealing mechanism according to claim 1, characterized in that: The outer wall of one end of the reduction sleeve (31) is provided with a coaxially arranged outer ring groove, and the inner wall of the other end of the reduction sleeve (31) is provided with an inner ring groove matched with the outer ring groove, and the ends of the stationary tube (1) and the rotating tube (4) are provided with inner ring grooves and outer ring grooves respectively.

6. The multi-stage reduction rotary sealing mechanism according to claim 5, characterized in that: The inner wall of the inner ring groove is provided with a sealing ring groove, the inner wall of the sealing ring groove is sleeved with a sealing ring gasket (32), and the inner ring of the sealing ring gasket (32) is sleeved with the outer wall of the outer ring groove.

7. The multi-stage reduction rotary sealing mechanism according to claim 2, characterized in that: The box body (2) comprises a shell (21) and a cover body (22), wherein the shell (21) and the cover body (22) are detachably connected via bolts; one end of the stationary tube (1) passes through the shell (21) and is connected to one end of the reduction tube assembly (3); one end of the rotating tube (4) passes through the cover body (22) and is connected to the other end of the reduction tube assembly (3).

8. The multi-stage reduction rotary sealing mechanism according to claim 7, characterized in that: The gaps between the inner wall of the box body (2) and the side walls of the transmission wheel (52) and the reduction wheel (6) are kept consistent.

9. The multi-stage reduction rotary sealing mechanism according to claim 7, characterized in that: The side wall of the housing (21) is provided with a first through hole penetrated by the stationary tube (1), and a sealing ring (7) is embedded in the inner wall of the first through hole; The inner wall of the cover body (22) is provided with a second through hole penetrated by the rotating tube (4), and the inner wall of the cover body (22) is provided with an oil seal (8) on the side of the second through hole.

10. The multi-stage reduction rotary sealing mechanism according to any one of claims 1 to 9, characterized in that: It also includes a snap-on key block (9), the outer wall of the reduction sleeve (31) is provided with a first key groove (10), the outer wall of the reduction wheel (6) is correspondingly provided with a second key groove (11), and the first key groove (10) and the second key groove (11) are connected via the snap-on key block (9).

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