Combined sealing device

Abstract

This application relates to a combined sealing device, including a sealing seat and a sealing element. The sealing seat has a sealing cavity through which a rotating shaft passes. The sealing element is detachably connected to the inner wall of the sealing cavity and is used to press against the outer wall of the rotating shaft to form a seal. When the rotating shaft passes through the sealing cavity, the sealing seat confines the sealing element to the outer wall of the rotating shaft, and the sealing element presses against the outer wall of the rotating shaft to form a seal. The design of the sealing seat and sealing element in this application eliminates the need to replace the entire combined sealing device, reducing material waste and embodying the concept of energy conservation, thereby reducing the operating cost of the combined sealing device. The guide surface increases the preload between the sealing ring and the rotating shaft, improving the sealing stability of the combined sealing device against the outer wall of the rotating shaft. The retaining ring prevents the spacer ring and sealing ring from axially shifting along the axis of the rotating shaft, thereby improving the positioning stability of the sealing ring and spacer ring on the housing.

Description

Technical Field

[0001] This application relates to the field of sealing devices, and more particularly to a combined sealing device. Background Technology

[0002] With the advancement of technology and the improvement of equipment performance, the requirements for sealing are becoming increasingly stringent. For example, in situations where the rotating shaft of a vacuum pump rotates at high speed, a sealing device is required to seal the area between the rotating shaft and the pump body.

[0003] Common sealing devices include mechanical seals and rubber seals. Mechanical seals provide good sealing for rotating shafts, but they are limited in radial dimensions, bulky in appearance, and expensive. Moreover, mechanical seals have very strict requirements for the application environment. On the other hand, conventional rubber seals installed in situations where the rotating shaft rotates at high speed and cannot be effectively lubricated can cause severe friction on the lip of the rubber seal in contact with the rotating shaft. This reduces the sealing effect of the rubber seal, leading to an increase in the frequency of maintenance and replacement of the rubber seals on the rotating shaft, thereby increasing the operating cost of the sealing device. Summary of the Invention

[0004] To address the issue of operating costs for sealing devices, this application provides a combined sealing device.

[0005] This application provides a combined sealing device, which adopts the following technical solution:

[0006] A combined sealing device includes a sealing seat and a sealing element. The sealing seat has a sealing cavity through which a rotating shaft passes. The sealing element is detachably connected to the inner wall of the sealing cavity and is used to press against the outer wall of the rotating shaft to form a seal. When the rotating shaft passes through the sealing cavity, the sealing seat confines the sealing element to the outer wall of the rotating shaft, and the sealing element presses against the outer wall of the rotating shaft to form a seal.

[0007] By adopting the above technical solution, when using the combined sealing device, the operator places the sealing seat on the outer wall of the rotating shaft and installs the sealing element on the inner wall of the sealing cavity. The sealing seat confines the sealing element on the rotating shaft, and the sealing element abuts against the outer wall of the rotating shaft to form a seal, thus realizing the installation of the combined sealing device on the rotating shaft. When the end face of the sealing element that is in rotational contact with the rotating shaft wears, the operator removes the sealing element from the sealing seat and replaces it with a new sealing element, thereby ensuring the sealing performance of the combined sealing device on the rotating shaft. At the same time, there is no need to replace the entire combined sealing device, reducing material waste, reflecting the concept of energy saving, and thus reducing the operating cost of the combined sealing device.

[0008] Optionally, the sealing element includes a housing, multiple spacer rings, and multiple sealing rings. The outer wall of the housing abuts against the inner wall of the sealing cavity to form a fixed structure. The housing has an installation cavity for the rotating shaft to pass through. The spacer rings and sealing rings are placed sequentially and spaced apart on the inner wall of the installation cavity to form a fixed structure, and the end face of the sealing ring abuts against the outer wall of the rotating shaft to form a seal.

[0009] By adopting the above technical solution, when installing the combined sealing device, the housing is embedded in the sealing cavity, and the outer wall of the housing is pressed against the inner wall of the sealing cavity to form a fixed position. The end of the rotating shaft passes through the mounting cavity, and the spacer ring and the sealing ring are placed alternately on the inner wall of the mounting cavity. The outer ring wall of the sealing ring is pressed against the inner wall of the mounting cavity to form a fixed position, the inner ring wall of the sealing ring is pressed against the outer wall of the rotating shaft to form a fixed position, and the outer ring wall of the spacer ring is pressed against the inner wall of the mounting cavity to form a fixed position. The spacer ring is located between adjacent sealing rings, which makes it difficult for adjacent sealing rings to move axially, thereby improving the sealing stability of the sealing rings on the outer wall of the rotating shaft.

[0010] Optionally, the end face of the sealing ring used to abut against the rotating shaft has a guide surface, the inclination height of which decreases as the distance to the axis of the sealing ring decreases, and the guide surface is used to abut against the outer wall of the rotating shaft to form a seal.

[0011] By adopting the above technical solution, when the spacer ring and the sealing ring are placed alternately on the inner wall of the mounting cavity, the guide surface presses against the outer wall of the rotating shaft and drives the sealing ring to change, thereby increasing the preload between the sealing ring and the rotating shaft and improving the sealing stability of the combined sealing device on the outer wall of the rotating shaft.

[0012] Optionally, the spacer ring has multiple connecting holes circumferentially along its own axis, and the inner wall of the mounting cavity has a connecting ring groove, which connects to the through holes.

[0013] By adopting the above technical solution, when the combined sealing device is in use, the guide surface rotates and contacts the rotating shaft. The sealing ring converts some of its kinetic energy into internal energy, causing the sealing ring temperature to rise. The sealing ring then transfers some of its internal energy heat to the air, causing the air in the mounting cavity to expand due to the increased temperature. The connecting hole connects to the connecting ring groove, and the heated and expanded air in the mounting cavity passes through the connecting hole and the connecting ring groove in sequence and is discharged from the connecting hole. This prevents the shell from becoming too pressurized and exploding, thereby improving the safety of the combined sealing device. At the same time, the operator introduces coolant into the mounting cavity through the connecting hole and the connecting ring groove in sequence. The sealing ring transfers most of its internal energy heat to the coolant, cooling the sealing ring and preventing it from being damaged due to prolonged operation at high temperatures. This improves the service life of the combined sealing device.

[0014] Optionally, the outer wall of the housing is provided with a through annular groove, and the inner wall of the through annular groove is provided with a plurality of connecting holes at intervals, the connecting holes being connected to the through annular groove.

[0015] By adopting the above technical solution, the mounting cavity, connecting hole, connecting ring groove, connecting hole, connecting ring groove, and sealing cavity are sequentially connected. When the rotating shaft rotates at high speed, the sealing ring converts some of its kinetic energy into internal energy. After the sealing ring heats up, it transfers some of its internal energy heat to the air. The heated air in the mounting cavity passes through the connecting hole, connecting ring groove, connecting hole, and connecting ring groove sequentially and enters the sealing cavity. The high-temperature air transfers some of its internal energy heat to the air in the sealing cavity, thus achieving heat dissipation of the sealing ring. At the same time, the operator injects coolant through the connecting hole. The coolant passes through the connecting ring groove and connecting hole and enters the connecting ring groove. The heated air in the sealing cavity transfers some of its internal energy heat to the coolant, thereby cooling the air in the sealing cavity. This prevents the combined sealing device from being damaged by operating at high temperatures for a long time, thus improving the service life of the combined sealing device.

[0016] Optionally, a retaining ring is connected to the housing, the retaining ring is embedded in the inner wall of the mounting cavity, and drives the spacer ring to press against the sealing ring to form a fixed shape.

[0017] By adopting the above technical solution, when the spacer ring and sealing ring are placed alternately on the inner wall of the mounting cavity, the outer ring wall of the spacer ring abuts against the inner wall of the mounting cavity to form a preliminary fixation; when the retaining ring is embedded in the mounting cavity, the end face of the retaining ring abuts against the end face of the spacer ring, and drives the end face of the spacer ring to abut against the end face of the sealing ring, thereby achieving fixation between the spacer ring and the sealing ring; when the rotating shaft rotates at high speed, the spacer ring and sealing ring are not easy to move axially along the axis of the rotating shaft, thereby improving the positioning stability of the sealing ring and spacer ring on the housing.

[0018] Optionally, a sealing ring is fitted on the outer wall of the housing, and the outer ring wall of the sealing ring abuts against the inner wall of the sealing cavity to form a fixed structure.

[0019] By adopting the above technical solution, a sealing ring is connected between the housing and the sealing seat. The inner ring wall of the sealing ring abuts against the outer wall of the housing, and the outer ring wall of the sealing ring abuts against the inner wall of the sealing cavity to form a seal, thereby improving the sealing effect between the housing and the sealing seat.

[0020] Optionally, the sealing element includes a sealing ring, the outer ring wall of which abuts against the inner wall of the sealing cavity to form a fixed seal, and the inner ring wall of which abuts against the outer wall of the rotating shaft to form a seal.

[0021] By adopting the above technical solution, a sealing cavity is provided at the end of the rotating shaft, and a sealing ring is embedded in the sealing cavity. The outer ring wall of the sealing ring abuts against the inner wall of the sealing cavity to form a fixation, and the inner ring wall of the sealing ring abuts against the outer wall of the rotating shaft to form a seal. This realizes the installation of the combined sealing device on the rotating shaft. When the high-speed rotation of the rotating shaft causes wear on the inner ring wall of the sealing ring, the operator can remove the damaged sealing ring from the sealing cavity and embed a new sealing ring into the sealing cavity. This achieves the sealing performance of the combined sealing device for the rotating shaft without the need to replace the entire combined sealing device, thereby reducing material waste, reflecting the concept of energy saving, and reducing the operating cost of the combined sealing device.

[0022] Optionally, the inner wall of the sealing ring has multiple protrusions, and the end face of each protrusion facing the rotating shaft has a mating surface. The inclination height of the mating surface decreases as the distance to the axis of the sealing ring decreases, and the mating surface is used to abut against the outer wall of the rotating shaft.

[0023] By adopting the above technical solution, when the mating surface presses against the outer wall of the rotating shaft, the rotating shaft squeezes the mating surface and drives the protrusion to deform, increasing the preload between the sealing ring and the rotating shaft, and improving the sealing performance of the combined sealing device for the rotating shaft.

[0024] Optionally, the multiple protrusions are in multiple groups, and adjacent abutment surfaces within the same group are close to each other.

[0025] By adopting the above technical solution, the abutting surface presses against the outer wall of the rotating shaft, the rotating shaft squeezes and deforms the protrusion, and a set of adjacent abutting surfaces move closer to each other, driving the adjacent protrusions to deform in a direction away from each other, and driving the outer wall of the sealing ring to press against the inner wall of the sealing cavity, making the sealing ring less likely to fall off the sealing seat, thereby improving the connection stability of the sealing ring on the sealing seat.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. The design of the sealing seat and sealing element eliminates the need to replace the entire combined sealing device, reducing material waste, embodying the concept of energy conservation, and thus lowering the operating cost of the combined sealing device;

[0028] 2. The design of the guide surface increases the preload between the sealing ring and the rotating shaft, thereby improving the sealing stability of the combined sealing device on the outer wall of the rotating shaft;

[0029] 3. The retaining ring design prevents the spacer ring and sealing ring from axially shifting along the rotation axis, thereby improving the positioning stability of the sealing ring and spacer ring on the housing. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0031] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0032] Figure 3 This is a cross-sectional view of the seal in Embodiment 3 of this application.

[0033] Figure 4 This is a cross-sectional view of the seal in Embodiment 3 of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Sealing seat; 11. Sealing cavity; 12. Cooling ring cavity; 13. Oil outlet; 14. Opening and closing cavity; 2. Sealing element; 21. Housing; 211. Anchoring groove; 212. Mounting cavity; 213. Connecting hole; 214. Through groove; 215. Limiting groove; 216. Connecting groove; 217. Flowing groove; 22. Sealing ring; 221. Guide surface; 222. Protrusion; 223. Anchoring surface ; 224. Connecting ring groove; 225. Deformation hole; 23. Spacer ring; 231. Connecting hole; 232. Abutting ring groove; 3. Rotating shaft; 4. Sealing ring; 5. Retaining ring; 51. Limiting part; 52. Filtering part; 521. Filter screen; 522. Filter cloth; 53. Fixing part; 6. Cooling assembly; 61. Thermal expansion and contraction block; 62. Piston; 7. Opening and closing part; 71. Thermal expansion block; 72. Opening and closing block; 721. Opening and closing hole. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0036] This application discloses a combined sealing device.

[0037] Example 1

[0038] Reference Figure 1 The combined sealing device includes a sealing seat 1 and a sealing element 2. The sealing seat 1 is a cylinder, and a sealing cavity 11 is coaxially formed on the sealing seat 1. The sealing cavity 11 passes through the opposite side walls of the sealing seat 1 along the axis of the sealing seat 1. The sealing element 2 is detachably connected to the inner wall of the sealing cavity 11. When the end of the rotating shaft 3 passes through the sealing cavity 11, the sealing element 2 is installed on the inner wall of the sealing cavity 11, and the sealing element 2 abuts against the outer wall of the rotating shaft 3 to form a seal.

[0039] Reference Figure 1 The sealing element 2 includes a housing 21, multiple sealing rings 22 and multiple spacer rings 23. The housing 21 is an integral cylinder or a mating cylinder. The outer diameter of the housing 21 is equal to the diameter of the sealing cavity 11. When the housing 21 is embedded in the sealing cavity 11, the outer circumferential wall of the housing 21 abuts against the inner wall of the sealing cavity 11 to achieve fixation.

[0040] Reference Figure 1The outer wall of the housing 21 has two abutment ring grooves 211, located at both ends of the axis of the housing 21. Two sealing rings 4 are connected between the housing 21 and the sealing seat 1. The sealing rings 4 can be made of rubber or silicone. In this embodiment, the sealing rings 4 are made of rubber and have a certain deformation capability. The sealing rings 4 and the abutment ring grooves 211 correspond one-to-one. The inner ring wall of the sealing ring 4 abuts against the inner ring wall of the abutment ring groove 211, and the outer ring wall of the sealing ring 4 abuts against the inner wall of the sealing cavity 11 to form a seal, thereby achieving a seal between the housing 21 and the sealing seat 1.

[0041] Reference Figure 1 The sealing ring 22 is made of a corrosion-resistant, wear-resistant and high-temperature resistant polymer material. In this embodiment, the sealing ring 22 is made of rubber and has a certain deformation capability. The spacer ring 23 is made of corrosion-resistant metal sheet by riveting or casting. In this embodiment, the spacer ring 23 can be made of stainless steel. The spacer ring 23 can also be made of corrosion-resistant and high-temperature resistant non-metallic material by injection molding or sintering. In this embodiment, the spacer ring 23 can be made of silicon dioxide.

[0042] Reference Figure 1 The housing 21 has a coaxial mounting cavity 212 for the sealing ring 22 and the spacer ring 23 to be inserted. The mounting cavity 212 extends through the opposite side walls of the housing 21 along the axis of the housing 21. The outer diameters of the spacer ring 23 and the sealing ring 22 are both equal to the diameter of the mounting cavity 212. The inner diameter of the sealing ring 22 is equal to the diameter of the rotating shaft 3, and the inner diameter of the spacer ring 23 is smaller than the inner diameter of the sealing ring 22.

[0043] Reference Figure 1 When the spacer ring 23 and the sealing ring 22 are sequentially and spaced apart into the mounting cavity 212, the outer ring walls of the spacer ring 23 and the sealing ring 22 abut against the inner wall of the mounting cavity 212 to form a preliminary fixation, and the inner ring wall of the sealing ring 22 abuts against the outer wall of the rotating shaft 3 to form a seal; at the same time, the spacer ring 23 is located between adjacent sealing rings 22, so that the adjacent sealing rings 22 are not easily deformed in the direction of mutual approach, thereby improving the limiting stability of the sealing ring 22 on the inner wall of the mounting cavity 212.

[0044] Reference Figure 1 The end face of the sealing ring 22 facing the axis of the sealing ring 22 has a guide surface 221. The inclination height of the guide surface 221 decreases as the distance to the axis of the sealing ring 22 decreases, and the guide surface 221 is used to abut against the outer wall of the rotating shaft 3 to form a seal. Two adjacent sealing rings 22 form a group, and the guide surfaces 221 on the two sealing rings 22 in the same group are close to each other. When the guide surface 221 abuts against the outer wall of the rotating shaft 3, the sealing rings 22 in the same group deform in the direction of inclination of the guide surface 221 toward each other, so that the two sealing rings 22 in the same group deform and abut against the outer wall of the spacer ring 23, further improving the limiting stability of the sealing ring 22 on the inner wall of the mounting cavity 212.

[0045] Reference Figure 1 The spacer ring 23 has multiple connecting holes 231 evenly spaced around its own axis. The axes of the connecting holes 231 are perpendicular to the axis of the spacer ring 23, and the connecting holes 231 penetrate the outer wall of the spacer ring 23 and connect to the mounting cavity 212. The inner wall of the mounting cavity 212 has multiple connecting holes 213 evenly spaced, and the connecting holes 213 correspond one-to-one with the connecting holes 231. The axes of the connecting holes 213 are parallel to the axes of the connecting holes 231, and the connecting holes 213 penetrate the outer wall of the housing 21. The outer wall of the housing 21 has a through annular groove 214 coaxially located between two abutting annular grooves 211, and the through annular groove 214 connects to the connecting holes 213.

[0046] Reference Figure 1 When the rotating shaft 3 rotates at high speed, the guide surface 221 rotates and contacts the outer wall of the rotating shaft 3. The sealing ring 22 converts some of the kinetic energy into internal energy. The temperature of the sealing ring 22 rises and transfers some of the internal energy heat to the air in the mounting cavity 212. The air in the mounting cavity 212 heats up and expands, and the air pressure in the mounting cavity 212 increases. The heated air passes through the connecting hole 231, the connecting hole 213, the through ring groove 214, and the connecting hole 213 in sequence and is discharged from the connecting hole 231, thereby reducing the pressure in the mounting cavity 212. This makes the combined sealing device less likely to explode due to pressure rise, thereby improving the safety of the combined sealing device.

[0047] Reference Figure 1 Meanwhile, the coolant is injected through the connecting hole 231 and passes sequentially through the connecting hole 213, the through ring groove 214, the connecting hole 213, the connecting hole 231, and into the mounting cavity 212. The sealing ring 22 transfers most of its internal heat to the coolant, thereby cooling the sealing ring 22. At the same time, the coolant lubricates the sealing ring 22 and the rotating shaft 3, thereby reducing the friction between the sealing ring 22 and the rotating shaft 3, reducing the damage to the sealing ring 22, thus reducing the number of times the sealing ring 22 needs to be replaced, reducing energy consumption, and embodying the concept of energy saving.

[0048] Reference Figure 1 A limiting annular groove 215 is coaxially formed on the inner wall of the mounting cavity 212, and the limiting annular groove 215 is close to one of the abutting annular grooves 211. A retaining ring 5 is connected to the housing 21, and the outer diameter of the retaining ring 5 is equal to the diameter of the limiting annular groove 215. When the retaining ring 5 is embedded in the limiting annular groove 215, the outer annular wall of the retaining ring 5 abuts against the inner wall of the limiting annular groove 215 to form a fixed position, and the end face of the retaining ring 5 abuts against the end face of the spacer ring 23, driving the spacer ring 23 to abut against the sealing ring 22 to form a fixed position. This makes it difficult for the spacer ring 23 and the sealing ring 22 to move axially along the axis of the rotating shaft 3, thereby improving the limiting stability of the spacer ring 23 and the sealing ring 22 on the inner wall of the mounting cavity 212.

[0049] The implementation principle of the combined sealing device in Embodiment 1 of this application is as follows: When the combined sealing device is in use, the end of the rotating shaft 3 passes through the sealing cavity 11, the housing 21 is embedded in the sealing cavity 11, and the outer wall of the housing 21 is pressed against the inner wall of the sealing cavity 11 to achieve fixation, and the rotating shaft 3 is located in the mounting cavity 212; the spacer ring 23 and the sealing ring 22 are sequentially and spaced apart and embedded in the mounting cavity 212, the outer ring walls of the spacer ring 23 and the sealing ring 22 are pressed against the inner wall of the mounting cavity 212, the retaining ring 5 is embedded in the limiting ring groove 215, the end face of the retaining ring 5 is pressed against the end face of the spacer ring 23, and drives the spacer ring 23 to press against the end face of the sealing ring 22 to form a fixation, so that the spacer ring in the mounting cavity 212 is fixed. The sealing ring 22 and the sealing ring 23 are not prone to axial movement along the axis of the housing 21, thereby improving the limiting stability of the sealing element 2 on the sealing seat 1; at the same time, the guide surface 221 abuts against the outer wall of the rotating shaft 3, and the rotating shaft 3 squeezes the guide surface 221 and drives the sealing ring 22 to deform, thereby increasing the clamping force between the sealing ring 22 and the rotating shaft 3. When the rotating shaft 3 operates at high speed for a long time, and the guide surface 221 rotates and contacts the outer wall of the rotating shaft 3 and wears, the staff only needs to replace the sealing ring 22, without replacing the entire combined sealing device, thereby reducing material consumption, reflecting the concept of energy saving, and reducing the use cost of the combined sealing device.

[0050] Example 2

[0051] Reference Figure 2 The difference between Embodiment 2 and Embodiment 1 is that the outer wall of the spacer ring 23 is coaxially provided with an abutment ring groove 232, and the abutment ring groove 232 is connected to the connecting hole 231. The inner wall of the mounting cavity 212 is coaxially provided with a connecting ring groove 216, and the connecting ring groove 216 is connected to the abutment ring groove 232.

[0052] Reference Figure 2 There are three clamping annular grooves 211, which are evenly distributed along the axis of the housing 21 at intervals. There are three sealing rings 4, each corresponding to one of the clamping annular grooves 211. The clamping annular grooves 211 divide the through annular groove 214 to form two flow annular grooves 217. There are two connecting holes 213, located at both ends of the axis of the housing 21, and each connecting hole 213 corresponds to one of the flow annular grooves 217.

[0053] Reference Figure 2 The inner diameter of the retaining ring 5 is equal to the diameter of the rotating shaft 3. The retaining ring 5 includes a limiting part 51, a filtering part 52 and a fixing part 53. The limiting part 51, the filtering part 52 and the fixing part 53 are fixed at their ends in sequence. The outer ring wall of the fixing part 53 abuts against the inner wall of the limiting ring groove 215 to form a fixation. The inner ring wall of the limiting part 51 abuts against the outer wall of the rotating shaft 3 to form a seal.

[0054] Reference Figure 2The filter section 52 includes a filter screen 521 and a filter cloth 522. The two ends of the filter cloth 522 along its axial direction are fixed between the fixing part 53 and the limiting part 51. The filter cloth 522 is made of polytetrafluoroethylene (PTFE) and only allows air to pass through. The two ends of the filter screen 521 along its axial direction are welded and fixed between the limiting part 51 and the fixing part 53. The filter screen 521 is located on the side of the filter cloth 522 facing the spacer ring 23. The filter screen 521 is made of stainless steel and has a certain structural strength. The filter screen 521 is used to filter impurities in the air.

[0055] Reference Figure 2 A cooling ring cavity 12 is coaxially formed inside the sealing seat 1. The cooling ring cavity 12 is used to store coolant, which is lubricating oil in this embodiment. An oil outlet 13 is formed on the inner wall of the sealing cavity 11, which connects the cooling ring cavity 12 and the through ring groove 214. A cooling assembly 6 is connected to the sealing seat 1. The cooling assembly 6 is used to drive the coolant in the cooling ring cavity 12 from the oil outlet 13 into the through ring groove 214.

[0056] Reference Figure 2 The cooling assembly 6 includes a thermal expansion and contraction block 61 and a piston 62. In this embodiment, the thermal expansion and contraction block 61 is made of nylon and has a certain coefficient of thermal expansion. One end of the thermal expansion and contraction block 61 is connected to the side of the cooling ring cavity 12 away from the oil outlet 13, and the other end of the thermal expansion and contraction block 61 is connected to the piston 62. When the thermal expansion and contraction block 61 heats up and expands, it drives the piston 62 to slide and drives the coolant in the cooling ring cavity 12 from the oil outlet 13 into the through ring groove 214, the flow ring groove 217, the connecting hole 213, the abutment ring groove 232, the connecting hole 231, and into the mounting cavity 212. The sealing ring 22 transfers most of its internal heat to the coolant, thereby cooling the sealing ring 22. At the same time, the coolant lubricates the sealing ring 22 and the rotating shaft 3, thereby reducing the wear of the rotating shaft 3 on the sealing ring 22 and extending the service life of the sealing ring 22.

[0057] Reference Figure 2 Meanwhile, the air that expands due to heating in the mounting cavity 212 passes through the filter screen 521 and is discharged from the filter cloth 522. The coolant in the mounting cavity 212 is intercepted by the filter cloth 522, thereby reducing coolant loss. When the thermal expansion and contraction block 61 cools down and contracts, it drives the coolant back into the cooling cavity, reduces the air pressure in the mounting cavity 212, and drives outside air to enter the mounting cavity 212 through the filter cloth 522, ensuring stable air pressure in the mounting cavity 212, thereby improving the service life of the combined sealing device.

[0058] Reference Figure 2The sealing seat 1 is connected to an opening and closing element 7 for opening and closing the oil outlet 13. The oil outlet is coaxially provided with an opening and closing cavity 14. The opening and closing element 7 includes a thermal expansion block 71 and an opening and closing block 72. An opening and closing hole 721 is provided on the opening and closing block 72. The axis of the opening and closing hole 721 is parallel to the axis of the oil outlet 13. The opening and closing hole 721 passes through the outer wall of the opening and closing block 72 along its own axis. In this embodiment, the thermal expansion block 71 is made of nylon and has a certain coefficient of thermal expansion.

[0059] Reference Figure 2 One end of the heated expansion block 71 is fixed to the inner wall of the opening and closing chamber 14, and the other end of the heated expansion block 71 is fixed to the opening and closing block 72, which closes the oil outlet 13. When the heated expansion block 71 heats up and expands, it drives the opening and closing block 72 to slide towards the axis of the oil outlet 13, and the opening and closing hole 721 connects to the oil outlet 13, so that the sealing effect of the oil outlet 13 disappears.

[0060] The implementation principle of the combined sealing device in Embodiment 2 of this application is as follows: When the combined sealing device is installed on the rotating shaft 3, the rotating shaft 3 rotates at high speed and rotates into contact with the guide surface 221. The guide surface 221 converts part of the kinetic energy into internal energy, causing the air temperature in the mounting cavity 212 to rise. The heated expansion block 71 heats up and expands, driving the opening and closing block 72 to slide towards the axis of the oil outlet 13. The opening and closing hole 721 connects to the oil outlet 13, causing the sealing effect of the oil outlet 13 to disappear; the thermal expansion and contraction block 61 heats up. During expansion, the piston 62 is driven to slide, and the coolant in the cooling ring cavity 12 is driven from the oil outlet 13 into the through ring groove 214, the flow ring groove 217, the connecting hole 213, the abutment ring groove 232, the connecting hole 231 and into the mounting cavity 212. The sealing ring 22 transfers most of its internal heat to the coolant, thereby cooling the sealing ring 22. At the same time, the coolant lubricates the sealing ring 22 and the rotating shaft 3, thereby reducing the wear of the rotating shaft 3 on the sealing ring 22 and extending the service life of the sealing ring 22.

[0061] Meanwhile, the air that expands due to heating in the mounting cavity 212 passes through the filter screen 521 and is discharged from the filter cloth 522. The coolant in the mounting cavity 212 is intercepted by the filter cloth 522, thereby reducing coolant loss. When the thermal expansion and contraction block 61 cools down and contracts, it drives the coolant back into the cooling cavity, reduces the air pressure in the mounting cavity 212, and drives outside air into the mounting cavity 212 through the filter cloth 522, ensuring stable air pressure in the mounting cavity 212 and thus improving the service life of the combined sealing device.

[0062] Example 3

[0063] Reference Figure 1 and Figure 3The difference between Embodiment 3 and Embodiment 1 is that the sealing element 2 includes a sealing ring 22, which is formed by injection molding. When the end of the rotating shaft 3 passes through the sealing cavity 11, the sealing ring 22 is embedded in the sealing cavity 11, the outer ring wall of the sealing ring 22 abuts against the inner wall of the sealing cavity 11 to form a seal, and the inner ring wall of the sealing ring 22 abuts against the outer wall of the rotating shaft 3 to form a seal.

[0064] Reference Figure 1 and Figure 3 The inner ring wall of the sealing ring 22 has multiple protrusions 222. The arrangement direction of the protrusions 222 is parallel to the axis of the sealing ring 22. The end face of the protrusions 222 facing the axis of the sealing ring 22 is provided with a mating surface 223. The inclination height of the mating surface 223 decreases as the axis of the sealing ring 22 shrinks. The mating surface 223 is used to press against the outer wall of the rotating shaft 3 to form a seal.

[0065] Reference Figure 3 and Figure 4 Two adjacent protrusions 222 form a group, and the mating surfaces 223 of the two protrusions 222 in the same group are close to each other; or the multiple protrusions 222 are divided into two groups, and the mating surfaces 223 of the two groups of protrusions 222 are far apart from each other. The outer wall of the sealing ring 22 is evenly spaced and coaxially provided with multiple connecting ring grooves 224. The arrangement direction of the connecting ring grooves 224 is parallel to the axis of the sealing ring 22, and the connecting ring grooves 224 are located between two adjacent protrusions 222.

[0066] Reference Figure 3 and Figure 4 The inner ring wall of the sealing ring 22 is provided with a plurality of deformation holes 225 evenly spaced apart. The axis of the deformation holes 225 is perpendicular to the axis of the sealing ring 22. The deformation holes 225 pass through the sealing ring 22 along their own axis and are connected to the connecting ring groove 224.

[0067] The implementation principle of the combined sealing device in Embodiment 3 of this application is as follows: When the combined sealing device is in use, the end of the rotating shaft 3 passes through the sealing cavity 11, the sealing ring 22 is embedded in the sealing cavity 11, the outer ring wall of the sealing ring 22 abuts against the inner wall of the sealing cavity 11, and the abutting surface 223 is interference-fitted with the outer wall of the rotating shaft 3. The rotating shaft 3 squeezes the abutting surface 223 and drives the protrusion 222 to deform, thereby improving the sealing effect of the combined sealing device on the outer wall of the rotating shaft 3. When the rotating shaft 3 rotates at high speed and wears the abutting surface 223, the operator only needs to replace the new sealing ring 22, without replacing the entire combined sealing device, thereby reducing the use cost of the combined sealing device. At the same time, the operator only needs to embed the sealing ring 22 between the sealing seat 1 and the rotating shaft 3 to realize the installation of the combined sealing device on the rotating shaft 3, which further facilitates the operator's installation of the combined sealing device and improves the operator's work efficiency.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-stage combined sealing device, characterized in that: The device includes a sealing seat (1) and a sealing element (2). The sealing seat (1) has a sealing cavity (11) through which a rotating shaft (3) passes. The sealing element (2) is detachably connected to the inner wall of the sealing cavity (11) and is used to abut against the outer wall of the rotating shaft (3) to form a seal. When the rotating shaft (3) passes through the sealing cavity (11), the sealing seat (1) limits the sealing element (2) to the outer wall of the rotating shaft (3), and the sealing element (2) abuts against the outer wall of the rotating shaft (3) to form a seal. The sealing element (2) includes a housing (21), multiple spacer rings (23), and multiple sealing rings (22). The outer wall of the housing (21) abuts against the inner wall of the sealing cavity (11) to form a fixation. The housing (21) has a sealing cavity (11) through which a rotating shaft (3) passes. 3) A through-hole mounting cavity (212) is provided, wherein the spacer ring (23) and the sealing ring (22) are placed sequentially and spaced on the inner wall of the mounting cavity (212) to form a fixed structure, and the end face of the sealing ring (22) abuts against the outer wall of the rotating shaft (3) to form a seal; the spacer ring (23) has multiple connecting holes (231) circumferentially opened along its own axis, and the inner wall of the mounting cavity (212) has a connecting ring groove (216) connected to the connecting holes (231); the outer wall of the housing (21) has a through ring groove (214), and the inner wall of the through ring groove (214) has multiple connecting holes (213) spaced apart, and the connecting holes (213) connected to the connecting ring groove (216); a retaining ring is connected to the housing (21). (5) The retaining ring (5) is embedded in the inner wall of the mounting cavity (212) and drives the partition ring (23) to press against the sealing ring (22) to form a fixed position; the retaining ring (5) includes a limiting part (51), a filtering part (52) and a fixing part (53), the limiting part (51), the filtering part (52) and the fixing part (53) are fixed at their ends in sequence, the outer ring wall of the fixing part (53) presses against the inner wall of the mounting cavity (212) to form a seal, the inner ring wall of the limiting part (51) presses against the outer wall of the rotating shaft (3) to form a seal, the filtering part (52) includes a filter screen (521) and a filter cloth (522), the two ends of the filter cloth (522) are fixed between the fixing part (53) and the limiting part (51), the two ends of the filter screen (521) are fixed between the fixing part (53) and the limiting part (51), the two ends of the filter screen (521) are fixed between the two ends of the filter cloth (522) and the two ends of the filter cloth (52 ... The end is fixed between the limiting part (51) and the fixing part (53). The filter screen (521) is located on the side of the filter cloth (522) facing the partition ring (23). The sealing seat (1) is coaxially provided with a cooling ring cavity (12) for storing coolant. The inner wall of the sealing cavity (11) is provided with an oil outlet (13). The oil outlet (13) connects the cooling ring cavity (12) and the through ring groove (214). The sealing seat (1) is connected to a cooling assembly (6). The cooling assembly (6) includes a thermal expansion and contraction block (61) and a piston (62). One end of the thermal expansion and contraction block (61) is connected to the side of the cooling ring cavity (12) away from the oil outlet (13). The other end of the thermal expansion and contraction block (61) is connected to the piston (62).

2. The multi-stage combined sealing device according to claim 1, characterized in that: The sealing ring (22) has a guide surface (221) on its end face for abutting against the rotating shaft (3). The inclination height of the guide surface (221) decreases as the distance to the axis of the sealing ring (22) decreases, and the guide surface (221) is used to abut against the outer wall of the rotating shaft (3) to form a seal.

3. The multi-stage combined sealing device according to claim 1, characterized in that: The outer wall of the housing (21) is fitted with a sealing ring (4), and the outer ring wall of the sealing ring (4) abuts against the inner wall of the sealing cavity (11) to form a fixed structure.

4. The multi-stage combined sealing device according to claim 1, characterized in that: The sealing element (2) includes a sealing ring (22), the outer ring wall of the sealing ring (22) abuts against the inner wall of the sealing cavity (11) to form a fixed seal, and the inner ring wall of the sealing ring (22) abuts against the outer wall of the rotating shaft (3) to form a seal.

5. The multi-stage combined sealing device according to claim 4, characterized in that: The inner ring wall of the sealing ring (22) has a plurality of protrusions (222), and the end face of the protrusions (222) facing the rotating shaft (3) is provided with a mating surface (223). The inclination height of the mating surface (223) decreases as the distance to the axis of the sealing ring (22) decreases, and the mating surface (223) is used to abut against the outer wall of the rotating shaft (3).

6. The multi-stage combined sealing device according to claim 5, characterized in that: The multiple protrusions (222) are divided into multiple groups, and the adjacent abutting surfaces (223) within the same group are close to each other.

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