Sealing element for coal mine hydraulic support liquid supply connector
By setting a honeycomb-shaped air bladder cavity inside the O-ring and an outer protective layer, the leakage problem of the seal under pressure and temperature changes is solved, and the stability and durability of the sealing effect are achieved.
Patent Information
- Application Number
- CN202520774390.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-04-23
AI Technical Summary
Existing O-rings cannot effectively adapt to changes in pressure and temperature, resulting in unsatisfactory sealing performance and easy leakage.
A honeycomb-shaped air bladder is set inside the O-ring and a protective layer is set on the outside. The honeycomb-shaped air bladder is used to absorb thermal expansion and contraction deformation, and the protective layer is used to prevent the filler ring from breaking and enhance the sealing performance.
Through the design of the air bladder structure and protective layer, the O-ring can flexibly adapt to changes in temperature and pressure, maintain a good sealing effect, and reduce the risk of leakage.
Smart Images
Figure CN223839922U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sealing technology, specifically to a sealing component for a hydraulic support fluid supply connector in a coal mine. Background Technology
[0002] A hydraulic support supply connector typically refers to a connector component used to connect hydraulic lines in a hydraulic support system. Hydraulic supports are widely used in mining, construction, and mechanical engineering. Their main function is to support, stabilize, and control the flow of fluid within the hydraulic system. As a key connecting component in the hydraulic system, the supply connector is responsible for delivering hydraulic oil to the support or restraint system, ensuring the normal operation of the equipment. In the hydraulic support supply connector, seals play a crucial role in ensuring the sealing of the hydraulic system under high pressure, preventing leakage and malfunctions. Common seal types include O-rings, suitable for both static and dynamic applications, which can be used at threaded connections or plug-in positions of the supply connector to provide a good sealing effect.
[0003] Existing O-rings cannot effectively adapt to pressure changes, and changes in liquid or gas temperature can cause changes in the volume of the O-ring, resulting in an unsatisfactory sealing effect and thus causing leakage. Utility Model Content
[0004] The purpose of this utility model is to provide a sealing element for the fluid supply joint of a hydraulic support in a coal mine, which solves the problem that existing sealing elements cannot effectively adapt to changes in pressure, and that changes in liquid or gas temperature can cause changes in the volume of the O-ring, resulting in an unsatisfactory sealing effect and leakage.
[0005] This utility model solves the above-mentioned technical problems through the following technical solution: the utility model includes a liquid supply connector, one end of which is provided with an O-ring seal, the O-ring seal is used to prevent liquid leakage at the liquid supply connector, and a filler ring is provided inside the O-ring seal to ensure the stability of the O-ring seal under different temperatures and pressures.
[0006] Preferably, the filling ring includes a hollow protective layer, and the interior of the hollow protective layer is provided with a honeycomb-shaped air bladder cavity.
[0007] Preferably, a protective layer is provided between the filler ring and the O-ring, the protective layer being used to prevent the filler ring from being squeezed and broken.
[0008] Preferably, the protective layer includes an STF coating sprayed on the outer surface of the hollow protective layer and a 3D printed lattice wrapped around the STF coating.
[0009] Preferably, the O-ring includes a first concave sealing ring and a second concave sealing ring wrapped around the outside of the 3D printed lattice.
[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0011] The honeycomb-shaped air bladder structure added inside the O-ring can absorb deformation caused by thermal expansion and contraction, thereby reducing the direct stress on the O-ring material. This allows the O-ring to adapt more flexibly to temperature changes, maintaining its effective sealing performance. Furthermore, the air bladder can help balance the pressure inside and outside the O-ring under different pressures, preventing failure caused by uneven pressure. By changing the internal air pressure, it self-regulates and responds to changes in the external environment, maintaining the O-ring's good sealing effect and reducing the risk of leakage. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the connection between the liquid supply connector and the O-ring seal of this utility model;
[0013] Figure 2 This is a partial cross-sectional view of the O-ring in this utility model;
[0014] Figure 3 for Figure 2 A breakdown diagram.
[0015] The numbers in the image represent:
[0016] 1. Liquid supply connector; 2. O-ring seal; 21. First concave seal; 22. Second concave seal; 3. Filler ring; 31. Hollow protective layer; 32. Air bladder cavity; 4. Protective layer; 41. STF coating; 42. 3D printed lattice. Detailed Implementation
[0017] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.
[0018] This embodiment provides a technical solution: a sealing element for a hydraulic support supply joint in a coal mine, such as... Figure 1-3 As shown, it includes: a liquid supply connector 1, one end of which is provided with an O-ring 2. The O-ring 2 is used to prevent liquid from leaking at the liquid supply connector 1. The O-ring 2 includes a first concave sealing ring 21 and a second concave sealing ring 22 wrapped around the outside of the 3D printed lattice 42. The concave surfaces of the first concave sealing ring 21 and the second concave sealing ring 22 correspond to each other and are bonded to each other to form a hollow sealing ring.
[0019] The O-ring 2 has an internal filler ring 3. The filler ring 3 ensures the stability of the O-ring 2 under different temperatures and pressures. The filler ring 3 includes a hollow protective layer 31 made of rubber. The hollow protective layer 31 has honeycomb-shaped air bladders 32 inside. The honeycomb-shaped air bladders 32 design ensures that the overall function of the filler ring 3 is not affected even if a single air bladder 32 ruptures, and it also makes the pressure distribution more uniform. When the temperature rises (thermal expansion), the gas inside the air bladders 32 is heated and the pressure increases, pushing the hollow protective layer 31 to expand outward, compensating for the material properties of the O-ring 2. The high-temperature softening causes a decrease in sealing force, maintaining the sealing contact pressure and preventing high-temperature leakage; when the temperature decreases (cold contraction), the gas volume in the airbag cavity 32 decreases, reducing the internal pressure on the O-ring 2, preventing the material from being over-compressed and causing permanent deformation or cracking, preserving elastic recovery ability, avoiding low-temperature failure, and can match temperature changes in real time without external control. It automatically balances the sealing pressure through the physical properties of the gas, and compared with metal springs or solid fillers, the airbag is lighter. The gas in the airbag cavity 32 can be an inert gas to avoid oxidation into the hollow protective layer 31 made of rubber.
[0020] A protective layer 4 is provided between the filler ring 3 and the O-ring seal 2. The protective layer 4 is used to prevent the filler ring 3 from being squeezed and broken. The protective layer 4 includes an STF coating 41 sprayed on the outer surface of the hollow protective layer 31 and a 3D printed lattice 42 wrapped around the STF coating 41. The 3D printed lattice 42 serves as a rigid support skeleton and can be made of lightweight (density as low as 0.5 g / cm3) titanium alloy lattice. The STF coating 41 serves as a flexible buffer layer. It is liquid under normal conditions and instantly solidifies into a "non-Newtonian fluid" protective layer upon impact. The coating thickness is 50-100 μm.
[0021] In use: The air bladder 32 inside the O-ring 2 can absorb deformation caused by thermal expansion and contraction, thereby reducing the direct stress on the O-ring 2 material. This allows the O-ring 2 to adapt more flexibly to temperature changes, maintaining its effective sealing performance. The air bladder 32 can also help balance the pressure inside and outside the O-ring 2 under different pressures, preventing failure caused by uneven pressure. By changing the internal air pressure, it self-regulates and responds to changes in the external environment, maintaining the good sealing effect of the O-ring 2. Adding a cavity between the O-ring and the contact surface can provide additional sealing points, enhance sealing performance, and reduce the risk of leakage. To avoid the risk of the air bladder 32 rupturing due to pressure, a protective layer 4 is set outside the filler ring 3. The 3D printed lattice 42 serves as a rigid support skeleton to improve the compressive strength of the filler ring 3, while the STF coating 41 serves as a flexible buffer layer. Under normal conditions, it is liquid, but when the filler ring 3 is impacted, it instantly solidifies into a "non-Newtonian fluid" protective layer.
[0022] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.
Claims
1. A sealing element for a hydraulic supply joint of a coal mine hydraulic support, characterized in that, include: Liquid supply connector (1), one end of which is provided with an O-ring (2), the O-ring (2) is used to prevent liquid from leaking at the liquid supply connector (1), and a filler ring (3) is provided inside the O-ring (2), the filler ring (3) is used to ensure the stability of the O-ring (2) under different temperatures and pressures.
2. The sealing element for the hydraulic supply joint of a coal mine hydraulic support as described in claim 1, characterized in that, The filling ring (3) includes a hollow protective layer (31), and the hollow protective layer (31) has a honeycomb-shaped air bladder cavity (32) inside.
3. The sealing element for the hydraulic supply joint of a coal mine hydraulic support as described in claim 2, characterized in that, A protective layer (4) is provided between the filler ring (3) and the O-ring seal (2), and the protective layer (4) is used to prevent the filler ring (3) from being squeezed and broken.
4. The sealing element for the fluid supply joint of a coal mine hydraulic support as described in claim 3, characterized in that, The protective layer (4) includes an STF coating (41) sprayed on the outer surface of the hollow protective layer (31) and a 3D printed lattice (42) wrapped around the STF coating (41).
5. The sealing element for the fluid supply joint of a coal mine hydraulic support as described in claim 4, characterized in that, The O-ring (2) includes a first concave sealing ring (21) and a second concave sealing ring (22) wrapped around the outside of the 3D printed lattice (42).