Sealing device

Abstract

The invention provides a sealing device, and belongs to the technical field of sealing. The sealing device comprises a first sealing assembly and a second sealing assembly, the first sealing assembly and the second sealing assembly are clamped between the transmission shaft and the shell, the first sealing assembly is provided with an opening, and the second sealing assembly is in interference fit with the transmission shaft. The reliability of the sealing device can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of sealing, and in particular relates to a sealing device. Background Art

[0002] A sealing device is usually required to seal between the transmission shaft and the housing in a mechanical transmission device.

[0003] In the related art, the sealing device is a sealing ring with a spring ring, which is clamped between the transmission shaft and the housing in the mechanical transmission device. The spring ring presses the sealing ring so that there is no gap between the sealing ring and the transmission shaft. When the sealing ring is worn, the sealing ring can still achieve good sealing under the action of the spring ring's rebound force.

[0004] However, when there are pressure changes in the working environment of mechanical transmission equipment, such as a high-pressure liquid environment with a water depth of more than 200 meters, the dynamic pressure resistance limit of the sealing ring is usually below 1MPa, so the sealing ring will fail due to the high-pressure environment, making it unable to meet the use requirements. In addition, mechanical transmission equipment will inevitably vibrate during movement, and the vibration will also cause the spring ring to fall off, causing the sealing ring to fail, resulting in poor sealing effect of the sealing device. Summary of the invention

[0005] The embodiment of the present disclosure provides a sealing device, which can improve the reliability of the sealing device. The technical solution is as follows:

[0006] The embodiment of the present disclosure provides a sealing device, which is used to seal a mechanical transmission device, wherein the mechanical transmission device comprises a transmission shaft and a housing, wherein the transmission shaft is partially located in the housing;

[0007] The sealing device includes a first sealing component and a second sealing component, the first sealing component and the second sealing component are clamped between the transmission shaft and the housing, and the first sealing component and the second sealing component are arranged along the axial direction of the transmission shaft; the first sealing component has an opening, the opening is arranged away from the second sealing component and faces the outside of the housing, and the opening is used to introduce liquid into the first sealing component so that the first sealing component can deform radially along the transmission shaft under hydraulic pressure to seal the transmission shaft and the housing; the second sealing component is interference fit with the transmission shaft.

[0008] In another embodiment of the present disclosure, the first sealing assembly includes an annular packing, the packing includes a first sealing ring and a second sealing ring, the second sealing ring is coaxially sleeved outside the first sealing ring, and the first end of the first sealing ring and the first end of the second sealing ring are spaced apart and define the annular opening, and the second end of the first sealing ring is connected to the second end of the second sealing ring.

[0009] In yet another implementation of the present disclosure, a first groove is provided in the middle of an inner ring wall of the first sealing ring, and a second groove is provided in the middle of an outer ring wall of the second sealing ring.

[0010] In another implementation of the present disclosure, the first sealing assembly also includes a supporting skeleton, which is an annular structure and is gap-matched with the transmission shaft, and the supporting skeleton and the transmission shaft define an annular installation cavity; the packing is located in the installation cavity, and along the axial direction of the transmission shaft, the packing is located on the side of the supporting skeleton away from the second sealing assembly and is in contact with the supporting skeleton.

[0011] In yet another implementation of the present disclosure, the support frame is a metal structure.

[0012] In another implementation of the present disclosure, the outer wall of the support frame has a sealing groove; the first sealing assembly also includes a first sealing ring, which is located in the sealing groove and clamped between the support frame and the shell.

[0013] In yet another implementation of the present disclosure, the second sealing assembly includes a second sealing ring, and the second sealing ring is interference-fitted on the outside of the transmission shaft.

[0014] In yet another implementation of the present disclosure, the second sealing ring is a lip sealing ring.

[0015] In another implementation of the present disclosure, the sealing device also includes a sealing spacer, which is located between the first sealing assembly and the second sealing assembly, and the sealing spacer is gap-matched with the transmission shaft; the sealing spacer is in contact with the first sealing assembly and the second sealing assembly on opposite sides along the axial direction of the transmission shaft, respectively, and a cavity is formed between the sealing spacer, the second sealing assembly and the transmission shaft.

[0016] In another implementation of the present disclosure, the sealing ring has a leakage hole along its radial direction, both ends of the leakage hole pass through the inner ring wall and the outer ring wall of the sealing ring, and the leakage hole is in communication with the cavity.

[0017] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0018] When the sealing device provided by the embodiment of the present disclosure is used in a mechanical transmission device, since the sealing device includes a first sealing component and a second sealing component, and the first sealing component has an opening, the opening is used to introduce liquid into the first sealing component, so that the first sealing component deforms along the radial direction of the transmission shaft under hydraulic pressure and seals with the transmission shaft and the housing respectively. Therefore, when the mechanical transmission device works in a deep water area, the first sealing component will contact the external water through the opening, thereby being subjected to hydraulic pressure. Under the action of hydraulic pressure, the first sealing component will expand outward along the radial direction of the transmission shaft and deform to contact the transmission shaft and the housing respectively. The greater the hydraulic pressure, the greater the deformation of the first sealing component, the tighter the first sealing component will fit with the transmission shaft and the housing on both sides, and the better the sealing effect, so that the sealing device still has a good sealing effect in a high-pressure environment.

[0019] Since the sealing device further includes a second sealing component, and the second sealing component contacts the first sealing component, and the second sealing component is interference-fitted with the transmission shaft, when the hydraulic pressure of the environment in which the mechanical transmission device is located is low, the first sealing component is deformed less due to the reduction of the hydraulic pressure, and some water that enters the first sealing component from the opening will pass through the first sealing component and reach the second sealing component. However, since the second sealing component is interference-fitted with the transmission shaft, the water that penetrates into the second sealing component can be blocked by the second sealing component outside the housing, so that the water will not enter the mechanical transmission device.

[0020] It can be seen that the sealing device provided by the embodiment of the present disclosure can achieve sealing in both high-pressure and low-pressure environments, and the sealing effect will not be affected by the operation of the mechanical transmission equipment. Therefore, the above sealing device can effectively solve the sealing requirements of mechanical transmission equipment working in different water depth environments, and improve the adaptability of the entire sealing device to the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 is a schematic diagram of a combination of a sealing device and a mechanical transmission device provided by an embodiment of the present disclosure;

[0023] Figure 2 yes Figure 1 Enlarged view of the center left portion;

[0024] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle packing.

[0025] The symbols in the figure mean the following:

[0026] 101, transmission shaft; 102, housing; 103, end cover; 1031, positioning flange; 1020, mounting groove;

[0027] 1. first sealing assembly; 10. opening; 11. packing; 111. first sealing ring; 1110. first groove; 112. second sealing ring; 1120. second groove; 12. supporting frame; 120. sealing groove; 13. first sealing ring;

[0028] 2. second sealing assembly; 21. second sealing ring; 211. outer substrate; 212. lip edge; 210. cavity;

[0029] 3. Sealing spacer ring; 30. Leakage hole. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0031] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top", "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0032] When the mechanical equipment is in a liquid working environment with changing pressure, it will be very difficult to design the sealing device for this type of mechanical equipment, because it is necessary to solve not only the sealing requirements under high pressure, but also the sealing requirements under low pressure. In order to meet the requirements of different use environments, different response plans need to be formulated in mechanical equipment according to the different use environments of the mechanical equipment, especially mechanical transmission equipment.

[0033] For mechanical transmission equipment, there are two different mechanical parts, static and dynamic. When working, the static parts are in a static state, while the dynamic parts will move relative to each other. In this way, the sealing device is required to isolate or seal the two parts, so that the external environment is isolated from the inside of the mechanical transmission equipment to ensure the use function of the entire mechanical transmission equipment.

[0034] For example, the mechanical transmission device is a deep water drainage device.

[0035] Figure 1 is a schematic diagram of a combination of a sealing device and a mechanical transmission device provided by an embodiment of the present disclosure, Figure 1 The mechanical transmission device includes a transmission shaft 101, a housing 102 and an end cover 103. The transmission shaft 101 is partially located in the housing 102. The transmission shaft 101 can rotate relative to the housing 102. The end cover 103 is located at one side of the housing 102, and the end cover 103 is detachably connected to the housing 102 by bolts.

[0036] The housing 102 has an annular mounting groove 1020 on one side facing the end cover 103. The circumference of the mounting groove 1020 is coaxial with the transmission shaft 101. The mounting groove 1020 is used to mount the sealing device described below.

[0037] The end cover 103 has an annular positioning flange 1031, which is located in the mounting groove 1020 and outside the transmission shaft 101, and the positioning flange 1031 is clearance-matched with the transmission shaft 101. The positioning flange 1031 contacts the sealing device.

[0038] The working environment of the transmission shaft 101 is underwater. When the water or liquid depth corresponding to the working environment reaches more than 200 meters, the conventional sealing ring cannot be used normally due to the increase of hydraulic pressure (the pressure resistance limit of the conventional sealing ring is generally below 1MPa), so the sealing ring cannot meet its use requirements. Although the packing seal with higher pressure resistance can meet the higher pressure resistance sealing requirements, it cannot achieve the sealing effect in the shallow water environment when the hydraulic pressure of the external environment is small.

[0039] An embodiment of the present disclosure provides a sealing device, which is used to seal a mechanical transmission device.

[0040] like Figure 1 As shown, the sealing device includes a first sealing component 1 and a second sealing component 2, which are clamped between a transmission shaft 101 and a housing 102, and are arranged along the axial direction of the transmission shaft. The first sealing component 1 has an opening 10, which is arranged away from the second sealing component 2 and toward the outside of the housing 102, and the opening 10 is used to introduce liquid into the first sealing component 1, so that the first sealing component 1 is deformed along the radial direction of the transmission shaft 101 under hydraulic pressure to seal the transmission shaft 101 and the housing 102. The second sealing component 2 is interference fit with the transmission shaft 101.

[0041] When the sealing device provided by the embodiment of the present disclosure is used in a mechanical transmission device, since the sealing device includes a first sealing component 1 and a second sealing component 2, and the first sealing component 1 has an opening 10, the opening 10 is used to introduce liquid into the first sealing component 1, so that the first sealing component 1 is deformed along the radial direction of the transmission shaft 101 under hydraulic pressure to seal the transmission shaft 101 and the housing 102, so when the mechanical transmission device works in a deep water area, the first sealing component 1 will contact the external water through the opening 10, thereby being subjected to hydraulic pressure. Under the action of hydraulic pressure, the first sealing component 1 will expand outward along the radial direction of the transmission shaft 101 and deform to contact the transmission shaft 101 and the housing 102 respectively. The greater the hydraulic pressure, the greater the deformation of the first sealing component 1, the tighter the first sealing component 1 will fit with the transmission shaft 101 and the housing 102 on both sides, and the better the sealing effect, so that the sealing device still has a good sealing effect in a high-pressure environment.

[0042] Since the sealing device further includes the second sealing component 2, and the second sealing component 2 is interference-fitted with the transmission shaft 101, when the hydraulic pressure in the environment of the mechanical transmission device is low, the first sealing component 1 is deformed less due to the reduction of the hydraulic pressure, and the water or liquid that enters the first sealing component 1 from the opening 10 will partially penetrate into the second sealing component 2. However, since the second sealing component 2 is interference-fitted with the transmission shaft 101, the water or liquid that penetrates into the second sealing component 2 can be completely blocked by the second sealing component 2 outside the housing 102, so that the water or liquid will not enter the mechanical transmission device.

[0043] It can be seen that the sealing device provided by the embodiment of the present disclosure can achieve sealing in both high-pressure and low-pressure environments, and the sealing effect will not be affected by the movement of the mechanical transmission equipment. Therefore, the above sealing device can effectively solve the sealing requirements of mechanical transmission equipment working in different water depth environments, and improve the adaptability of the entire sealing device to the working environment.

[0044] Figure 2 yes Figure 1The enlarged image of the middle left part, combined with Figure 2 Optionally, the first sealing assembly 1 includes an annular packing 11, the packing 11 includes a first sealing ring 111 and a second sealing ring 112, the second sealing ring 112 is coaxially sleeved outside the first sealing ring 111, and the first end of the first sealing ring 111 and the first end of the second sealing ring 112 are spaced apart to define an annular opening 10, and the second end of the first sealing ring 111 and the second end of the second sealing ring 112 are connected.

[0045] In the above implementation, the opening 10 can be simply defined by the first sealing ring 111 and the second sealing ring 112, so that the opening 10 can quickly introduce water or liquid in the external environment into the first sealing assembly 1, so that the first sealing assembly 1 is deformed under hydraulic pressure to seal between the housing 102 and the drive shaft 101.

[0046] Moreover, a U-shaped structure can be defined by the first sealing ring 111 and the second sealing ring 112. That is, the axial section of the packing 11 is a U-shaped structure. When subjected to external hydraulic pressure, the two sides of the U-shaped structure will expand outward. The greater the hydraulic pressure, the tighter the first sealing ring 111 and the second sealing ring 112 in the U-shaped structure are pressed against the components on both sides (housing 102 and transmission shaft 101), and the better the sealing effect. The U-shaped structure can withstand higher hydraulic pressure, thereby ensuring the internal sealing effect of the above mechanical transmission equipment in a deep water environment.

[0047] Furthermore, the first sealing component 1 is set as the packing 11 because the packing 11 is generally made of graphite, fiber, etc. Graphite, fiber, etc. generally have the characteristics of high pressure resistance and high temperature resistance, so the packing 11 as the first sealing component 1 can adapt to the high pressure environment, so as to further ensure that the mechanical transmission equipment has good sealing performance in the deep water environment.

[0048] In the disclosed embodiment, the packing 11 is a graphite packing with a U-shaped cross-sectional area, which is made of graphite wires reinforced with various reinforcing fibers, metal wires (steel wire, copper wire, nickel wire, carbon fiber, preoxidized wire, glass yarn) and the like as raw materials, and is carefully woven. In this way, the packing 11 can be applied to high temperature and high pressure environments.

[0049] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle packing, combined with Figure 3 Optionally, a first groove 1110 is provided in the middle of an inner ring wall of the first sealing ring 111 , and a second groove 1120 is provided in the middle of an outer ring wall of the second sealing ring 112 .

[0050] In the above implementation, the first groove 1110 is used to enable the first sealing ring 111 to deform quickly under high pressure, so that the first sealing ring 111 can quickly contact the sealing surface of the transmission shaft 101.

[0051] The second groove 1120 is used to enable the second sealing ring 112 to deform quickly under high pressure, so that the second sealing ring 112 can quickly contact with the supporting frame 12 .

[0052] Recombination Figure 2 Optionally, the first sealing assembly 1 further includes a supporting skeleton 12 , which is an annular structure and is clearance-matched with the transmission shaft 101 , and the supporting skeleton 12 and the transmission shaft 101 define an annular installation cavity.

[0053] The packing 11 is located in the installation cavity. Along the axial direction of the transmission shaft 101 , the packing 11 is located on a side of the support frame 12 away from the second sealing assembly 2 and is in contact with the support frame 12 .

[0054] In the above implementation, the support frame 12 is used to provide a mounting base for the packing 11 so that the packing 11 can be fixed and will not move.

[0055] In the disclosed embodiment, the support frame 12 is a cylindrical structure with an inner flange. The inner flange is located inside one end of the cylindrical body facing the second sealing assembly 2. In this way, an annular installation cavity can be defined by the inner flange, the end cover 103, and the housing 102, so that the packing 11 can be fixed in the annular installation cavity and the packing 11 will not fall off or move.

[0056] In the disclosed embodiment, the support frame 12 is a metal structure.

[0057] Combination Figure 3 When subjected to external hydraulic pressure, the first sealing ring 111 and the second sealing ring 112 in the packing 11 will expand outward under the action of the hydraulic pressure, so that the first sealing ring 111 contacts the outer surface of the transmission shaft 101 and the second sealing ring 112 contacts the support frame 12.

[0058] Since the support frame 12 and the transmission shaft 101 are both metal structural parts, the corresponding structural strength is relatively large. Therefore, the greater the hydraulic pressure, the tighter the first sealing ring 111 and the second sealing ring 112 will be pressed against the metal components on both sides, thereby improving the sealing effect.

[0059] Optionally, the outer wall of the support frame 12 has an annular sealing groove 120. The first sealing assembly 1 further includes a first sealing ring 13, which is located in the sealing groove 120 and is clamped between the support frame 12 and the housing 102.

[0060] In the above implementation, the sealing groove 120 is used to assemble the first sealing ring 13. The first sealing ring 13 is used to further improve the sealing between the support frame 12 and the housing 102, so that external water or liquid will not penetrate into the housing 102 from between the support frame 12 and the housing 102.

[0061] In the disclosed embodiment, the first sealing ring 13 is a rubber sealing ring.

[0062] Combination Figure 1 Optionally, the second sealing assembly 2 includes a second sealing ring 21 , and the second sealing ring 21 is interference-fitted on the outside of the transmission shaft 101 .

[0063] In the above implementation, the second sealing ring 21 is used to cooperate with the transmission shaft 101 so as to seal between the transmission shaft 101 and the housing 102 in a low-pressure environment.

[0064] Combination Figure 2 Optionally, the second sealing ring 21 is a lip-shaped sealing ring. The second sealing ring 21 includes an outer base 211 and a lip 212. The lip 212 is annular and is located inside the outer base 211. The lip 212 is connected to the outer base 211. The lip 212 is interference-fitted on the outside of the transmission shaft 101.

[0065] The second sealing ring 21 is a lip-shaped sealing ring, and can achieve sealing by quickly deforming the lip edge 212 so that the lip edge 212 is tightly attached to the sealing surface of the transmission shaft 101 .

[0066] Moreover, the second sealing ring 21 is configured as a lip-shaped sealing ring, so that a space can be formed between the outer base 211 and the lip edge 212, so that the liquid or water that penetrates from the first sealing component 1 can be stored in the space, further reducing the pressure impact of water or liquid on the second sealing ring 21, so as to improve the sealing effect.

[0067] Optionally, the sealing device further comprises a sealing spacer ring 3 , which is located between the supporting frame 12 in the first sealing component 1 and the second sealing component 2 , and the sealing spacer ring 3 is clearance-matched with the transmission shaft 101 .

[0068] The sealing spacer ring 3 is in contact with the support frame 12 in the first sealing component 1 and the second sealing component 2 at opposite sides along the axial direction of the transmission shaft 101. A cavity 210 is formed between the sealing spacer ring 3, the second sealing component 2 and the transmission shaft 101.

[0069] In the above implementation, the sealing spacer ring 3 is used to compress and support the packing 11 in the first sealing assembly 1 and the second sealing assembly 2, so that the packing 11 and the second sealing assembly 2 can be stably installed outside the transmission shaft 101.

[0070] Moreover, the presence of the cavity 210 can reduce the pressure impact of moisture penetrating from the first sealing assembly 1 on the second sealing ring 21, thereby weakening the impact of hydraulic pressure on the second sealing ring 21 and improving the sealing effect of the second sealing ring 21 on the mechanical transmission equipment in a low-pressure environment.

[0071] Optionally, the sealing ring 3 has a leakage hole 30 along its radial direction, and two ends of the leakage hole 30 penetrate the inner ring wall and the outer ring wall of the sealing ring 3 , and the leakage hole 30 is in communication with the cavity 210 .

[0072] In the above implementation, a leakage hole 30 is provided on the sealing spacer 3. When water or liquid leaking from the packing 11 enters between the packing 11 and the second sealing assembly 2, it will be introduced into the water outlet hole in the housing 102 of the mechanical transmission device through the leakage hole 30 on the sealing spacer 3, so that the leaked water or liquid is discharged into the oil tank at the bottom of the mechanical transmission device, so as to further reduce the pressure on the second sealing assembly 2 caused by the hydraulic pressure between the packing 11 and the second sealing assembly 2, thereby improving the reliability of the second sealing assembly 2.

[0073] In the disclosed embodiment, the sealing spacer 3 is also a metal structure. For example, the sealing spacer 3 is a steel structure. In this way, the hardness and rigidity of metal can be utilized to enable the sealing spacer 3 to compress and support the packing 11 in the first sealing assembly 1 and the second sealing assembly 2, ensuring that the packing 11 and the second sealing assembly 2 can be stably installed outside the transmission shaft 101.

[0074] The following is a brief introduction to the use of the sealing device provided in the embodiment of the present disclosure:

[0075] First, the sealing device provided in the embodiment of the present disclosure is assembled between the transmission shaft 101 and the housing 102 in the mechanical transmission equipment.

[0076] When the environment in which the mechanical transmission equipment is located is an environment with a large water depth, such as a deep water area. The sealing device is subjected to a large external hydraulic pressure. The water or liquid outside the sealing device will enter the packing 11 through the opening 10 in the first sealing component 1 and contact the packing 11. Under the action of the hydraulic pressure, the first sealing ring 111 and the second sealing ring 112 in the packing 11 will expand outward and move away from each other. The first sealing ring 111 contacts the outer surface of the transmission shaft 101, and the second sealing ring 112 contacts the support frame 12. The greater the hydraulic pressure, the greater the expansion range of the first sealing ring 111 and the second sealing ring 112, the tighter the first sealing ring 111 contacts the outer surface of the transmission shaft 101, the tighter the second sealing ring 112 contacts the support frame 12, and the better the sealing effect. The packing 11 in the first sealing component 1 can withstand higher hydraulic pressure, thereby ensuring that the mechanical transmission equipment also has a good sealing effect in a deep water environment.

[0077] When the mechanical transmission equipment is located in an environment with a relatively small water depth, such as a shallow water area, the sealing device is subjected to relatively small external hydraulic pressure. The packing 11 in the first sealing assembly 1 cannot produce a large deformation under the action of a relatively small hydraulic pressure, and the first sealing ring 111 and the second sealing ring 112 in the packing 11 cannot expand outward. The first sealing ring 111 cannot be in close contact with the transmission shaft 101, and the second sealing ring 112 cannot be in close contact with the support frame 12. The packing 11 cannot achieve a complete sealing effect.

[0078] External water or liquid will penetrate into the cavity 210 of the second sealing component 2 through the space between the first sealing component 1 and the transmission shaft 101. Since the second sealing component 2 and the transmission shaft 101 are interference fit, the second sealing component 2 will not be affected by the hydraulic pressure, and the second sealing component can completely and effectively seal.

[0079] Moreover, when some water or liquid leaks into the second sealing component 2, the hydraulic pressure of the leaked water or liquid will not be very large due to the sealing block of the packing 11, and the penetrating water or liquid will not affect the second sealing component 2. The second sealing component 2 can completely and effectively seal the mechanical transmission equipment.

[0080] In addition, a leakage hole 30 is provided on the sealing spacer ring 3, and water that leaks into the cavity 210 through the packing 11 will also flow out through the leakage hole 30 on the sealing spacer ring 3, so as to further reduce the pressure on the second sealing component 2 caused by the hydraulic pressure in the cavity 210, thereby improving the reliability of the second sealing component 2.

[0081] The above-mentioned sealing device can not only effectively solve the sealing requirements of mechanical transmission equipment when working in different water depth working conditions, but also improve the adaptability of the entire sealing device to the working environment and expand the scope of use of the sealing device.

[0082] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A sealing device, characterized in that: The sealing device is used for sealing a mechanical transmission device, wherein the mechanical transmission device comprises a transmission shaft (101) and a housing (102), wherein a portion of the transmission shaft (101) is located in the housing (102); The sealing device comprises a first sealing component (1) and a second sealing component (2), wherein the first sealing component (1) and the second sealing component (2) are clamped between the transmission shaft (101) and the housing (102), and the first sealing component (1) and the second sealing component (2) are arranged along the axial direction of the transmission shaft (101); The first sealing component (1) has an opening (10), the opening (10) is arranged away from the second sealing component (2) and faces the outside of the housing (102), and the opening (10) is used to introduce liquid into the first sealing component (1), so that the first sealing component (1) can deform along the radial direction of the transmission shaft (101) under hydraulic pressure to seal the transmission shaft (101) and the housing (102); The second sealing assembly (2) is interference fit with the transmission shaft (101).

2. The sealing device according to claim 1, characterized in that: The first sealing assembly (1) comprises an annular packing (11), wherein the packing (11) comprises a first sealing ring (111) and a second sealing ring (112), wherein the second sealing ring (112) is coaxially sleeved outside the first sealing ring (111), and the first end of the first sealing ring (111) and the first end of the second sealing ring (112) are spaced apart and define the annular opening (10), and the second end of the first sealing ring (111) and the second end of the second sealing ring (112) are connected.

3. The sealing device according to claim 2, characterized in that: The middle portion of the inner ring wall of the first sealing ring (111) has a first groove (1110), and the middle portion of the outer ring wall of the second sealing ring (112) has a second groove (1120).

4. The sealing device according to claim 2, characterized in that: The first sealing assembly (1) further comprises a support frame (12), the support frame (12) being an annular structure and being clearance-matched with the transmission shaft (101), the support frame (12) and the transmission shaft (101) defining an annular installation cavity; The packing (11) is located in the installation cavity, along the axial direction of the transmission shaft (101), the packing (11) is located on a side of the support frame (12) away from the second sealing assembly (2), and is in contact with the support frame (12).

5. The sealing device according to claim 4, characterized in that: The supporting frame (12) is a metal structural member.

6. The sealing device according to claim 4, characterized in that: The outer wall of the support frame (12) has a sealing groove (120); The first sealing assembly (1) further comprises a first sealing ring (13), wherein the first sealing ring (13) is located in the sealing groove (120) and is clamped between the supporting frame (12) and the housing (102).

7. The sealing device according to any one of claims 1 to 6, characterized in that: The second sealing assembly (2) comprises a second sealing ring (21), and the second sealing ring (21) is interference-fitted on the outside of the transmission shaft (101).

8. The sealing device according to claim 7, characterized in that: The second sealing ring (21) is a lip sealing ring.

9. The sealing device according to any one of claims 1 to 6 and 8, characterized in that: The sealing device further comprises a sealing spacer ring (3), wherein the sealing spacer ring (3) is located between the first sealing component (1) and the second sealing component (2), and the sealing spacer ring (3) is clearance-matched with the transmission shaft (101); The sealing spacer (3) is in contact with the first sealing component (1) and the second sealing component (2) at opposite sides along the axial direction of the transmission shaft (101), respectively, and a cavity (210) is formed between the sealing spacer (3), the second sealing component (2) and the transmission shaft (101).

10. The sealing device according to claim 9, characterized in that: The sealing spacer ring (3) has a leakage hole (30) along its radial direction, and both ends of the leakage hole (30) penetrate the inner ring wall and the outer ring wall of the sealing spacer ring (3), and the leakage hole (30) is connected to the cavity (210).

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