Multi-stage sealing structure of liquid composite node filling opening

Abstract

A multi-stage sealing structure of a liquid composite joint filling opening comprises a first-stage sealing structure and a second-stage sealing structure, and the first-stage sealing structure comprises a steel ball in a high-pressure injection flow channel; the secondary sealing structure comprises a plug bolt locked at the filling port, the plug bolt comprises a sealing end and a locking end, the sealing end is provided with a metal gasket and an O-shaped ring, the locking end is provided with an external thread, the filling port comprises a cavity end and a threaded end, the cavity end is directly communicated with the runner, and the threaded end is provided with an internal thread matched with the external thread of the locking end. The steel ball injected into the runner at high pressure is used as a first-stage sealing structure, the plug bolt is provided with the metal gasket and the O-shaped ring and then is locked to the filling opening to serve as a second-stage sealing structure, the two-stage sealing structure can independently play a sealing role, when one sealing structure fails, the other sealing structure can still play a role, and the sealing effect is good. The sealing effect is ensured.

Description

Technical Field

[0001] The utility model designs a sealing structure for a liquid composite node filling port, in particular to a multi-level sealing structure for a liquid composite node filling port. Background Art

[0002] Liquid composite node is a widely used vibration and noise reduction connection node. During its assembly process, the flow channel and hydraulic cavity need to be filled with viscous liquid, and in the subsequent use of the liquid composite node, the viscous liquid cannot leak from the filling port, otherwise it will cause the liquid composite node to fail. Therefore, the sealing requirements at the filling port of the liquid composite node are very high. In order to ensure the sealing effect, the applicant proposed a special plug in the previous design (application number CN201710049794.4, invention patent named "A Hydraulic Bushing"), but the plug structure is very complicated, resulting in very high cost, which in turn increases the cost of the liquid composite node.

[0003] There is also a utility model patent with application number CN201320008832.9, named "A double sealing element", which uses the top bevel to cooperate with the middle sealing ring to seal the liquid filling channel. The invention application with application number CN201210037492.2, named "A portable rapid rescue equipment", uses the method of screws pushing steel balls to seal. The utility model patent with application number CN201721721776.8, named "A straight-through vent bolt", uses a spring to push a gasket, a gasket to push an O-ring, and an O-ring to push a steel ball to form a sealing structure. However, in these structures, all the forces are provided by the threads. When the threads are loose, the sealing effect will disappear.

[0004] There is also a utility model patent with application number CN202321325335.1 and the name of "A hydraulic tool", which uses a multi-stage threaded connection structure to push the steel ball and cooperate with the use of a sealing ring to achieve a sealing effect. When this structure requires multiple sets of threaded structures to cooperate, the structure is complex and the cost is too high. Utility Model Content

[0005] In view of the problems of excessively high cost or single force in the current sealing structure of the pipe mouth, the utility model proposes a multi-stage sealing structure for the filling port of a liquid composite node. The filling port is sealed by using a multi-stage sealing structure that can function independently to ensure that liquid will not leak from the filling port during the service life of the liquid composite node.

[0006] The technical means adopted by the utility model to solve the above problems are: a multi-stage sealing structure of a liquid composite node filling port, including a primary sealing structure and a secondary sealing structure, wherein the primary sealing structure includes a steel ball injected into the high-pressure flow channel; the secondary sealing structure includes a plug bolt locked at the filling port, wherein the plug bolt includes a sealing end and a locking end, the sealing end is provided with a metal gasket and an O-ring, the locking end is provided with an external thread, the filling port includes a cavity end and a threaded end, the cavity end is directly connected to the flow channel, and the threaded end is provided with an internal thread matching the external thread of the locking end. The steel ball and the plug bolt act independently and can respectively play a sealing effect.

[0007] Furthermore, the multi-stage sealing structure also includes a third-stage sealing structure, which refers to the fastening glue injected into the filling port after the steel ball is injected and the plug bolt is locked, so as to once again ensure the sealing of the filling port.

[0008] Furthermore, the fastening glue is waterproof glue.

[0009] Furthermore, after the plug bolt is locked to the pouring port, the sealing end extends into the flow channel to hold the steel ball, thereby preventing the steel ball from slipping out of the pouring port.

[0010] Furthermore, there is one metal gasket, which is sleeved on the outer periphery of the sealing end; there are two O-rings, one of which is also sleeved on the outer periphery of the sealing end and is located between the sealing end and the metal gasket, and the other is arranged on the end face of the rubber gasket close to the flow channel. One O-ring is used to seal the gap between the sealing end and the metal gasket, and the other O-ring is used to seal the metal gasket and the end face of the injection port to ensure that the liquid in the flow channel will not leak from the plug bolt.

[0011] Furthermore, an annular groove is provided on the outer periphery of the sealing end, and an O-ring is arranged in the annular groove.

[0012] Furthermore, a groove is provided on the end surface of the metal gasket close to the flow channel, and the O-ring is arranged in the groove.

[0013] Furthermore, the steel ball and the flow channel are in interference fit, and the interference force is used to prevent the steel ball from falling off the flow channel.

[0014] Furthermore, the hardness of the steel ball is greater than the hardness of the flow channel. When the steel ball is injected under high pressure, the flow channel is forced to deform, while the steel ball does not deform, thereby ensuring that the steel ball does not fall off.

[0015] Furthermore, a hexagonal countersunk hole is provided at the end of the locking end of the plug bolt away from its sealing end to facilitate its locking.

[0016] The beneficial effects of the utility model are:

[0017] 1. The utility model adopts steel balls injected into the flow channel under high pressure as the primary sealing structure, and sets a metal gasket and an O-ring on the plug bolt and locks it to the filling port as the secondary sealing structure. The two-stage sealing structures can independently play a sealing effect. When one sealing structure fails, the other sealing structure can still work to ensure the sealing effect.

[0018] 2. The utility model also injects a fastening glue into the filling port as a third-level sealing structure. The fastening glue can not only play a sealing role, but also fix the position of the plug bolt to prevent the plug bolt from loosening, thereby ensuring the effect of the secondary seal. The sealing end of the secondary sealing structure pushes the steel ball to prevent the steel ball from slipping out of the flow channel, thereby ensuring the effect of the primary seal. In this way, the latter-level sealing structure can optimize the sealing effect of the previous level while independently playing a sealing role, thereby ensuring the absolute sealing of the filling port.

[0019] 3. The utility model forms a sealing structure between the sealing end and the metal gasket, and between the metal gasket and the outer end wall of the flow channel by arranging an O-ring between the sealing end and the metal gasket, and between the metal gasket and the outer end wall of the flow channel, thereby ensuring that no liquid leaks from the plug bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the multi-stage sealing structure of the injection port of Example 1;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram;

[0022] Figure 3 This is a schematic diagram of the filling port of Example 1;

[0023] Figure 4 This is a schematic diagram of a rubber gasket in Example 1;

[0024] Figure 5 This is a schematic diagram of a metal gasket in Example 1;

[0025] Figure 6 This is a schematic cross-sectional view of a metal gasket in Example 1;

[0026] Figure 7 This is a schematic diagram of a plug bolt in Example 1;

[0027] In the figure: 1. steel ball, 2. filling port, 21. cavity end, 22. threaded end, 3. plug bolt, 31. sealing end, 32. locking end, 33. hexagonal countersunk hole, 34. annular groove, 4. flow channel, 5. metal gasket, 51. groove, 6. O-ring. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings. The accompanying drawings are only used for exemplary descriptions, and are only schematic diagrams, not actual pictures, and cannot be understood as limiting the present patent; in order to better illustrate the embodiments of the utility model, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted. Embodiment 1

[0029] A multi-stage sealing structure for a liquid composite node injection port, such as Figure 1-Figure 7 As shown, it includes a primary sealing structure, a secondary sealing structure and a tertiary sealing structure. The primary sealing structure is a steel ball 1 injected into the flow channel 4 under high pressure, the secondary sealing structure is a plug bolt 3 locked at the injection port 2 together with a metal gasket 5 and an O-ring 6, and the tertiary sealing structure is a fastening glue injected into the gap between the plug bolt 3 and the injection port 2.

[0030] Specifically, for a liquid composite node, the hardness of the mandrel for setting the flow channel 4 is very high, and the hardness of the steel ball 1 must be greater than the hardness of the mandrel, and the outer diameter of the steel ball 1 needs to be greater than the inner diameter of the flow channel 4, so that after the steel ball 1 is driven into the flow channel 4, the flow channel 4 is forced to deform instead of the steel ball 1, and there is enough interference force between the steel ball 1 and the flow channel 4 to ensure that the steel ball 1 will not fall off from the flow channel 4. Therefore, the steel ball 1 needs to be driven into the flow channel 4 quickly and at high pressure.

[0031] like Figure 3 As shown, the injection port 2 includes a cavity end 21 and a threaded end 22. The cavity end 21 is close to the flow channel 4 and is directly connected to the flow channel 4. The threaded end 22 is provided with an internal thread. In order to facilitate processing, the inner diameters of the cavity end 21 and the threaded end 22 can be made the same. In this way, during processing, an integral cavity can be processed at one time, and then the internal thread can be processed at the threaded end 22.

[0032] like Figure 7 As shown, the plug bolt 3 includes a sealing end 31 and a locking end 32. The outer periphery of the sealing end 31 is provided with an annular groove 34 for placing an O-ring, and the locking end 32 is provided with an external thread, and its external thread matches the internal thread of the threaded end 22 of the filling port 2. When the plug bolt 3 is locked to the filling port 2, it is locked by the cooperation between the external thread and the internal thread. In addition, the locking end 32 is provided with a hexagonal countersunk hole 33 at the end away from the sealing end 31. When assembling the plug bolt 3, a tool is inserted into the hexagonal countersunk hole 33 to drive the plug bolt 3 to rotate and tighten it.

[0033] like Figure 5 and Figure 6 As shown, one end surface of the metal gasket 5 is provided with a groove 51 , and the O-ring 6 is placed in the groove 51 .

[0034] like Figure 2 As shown, an O-ring 6 is sleeved in the annular groove 34 on the outer periphery of the sealing end 31 of the plug bolt 3, and another O-ring 6 is placed in the groove 51 of the metal gasket 5. When the plug bolt 3, the metal gasket 5 and the O-ring 6 are assembled to the filling port 2, the sealing end 31 can extend into the flow channel 4 to support the steel ball 1, which strengthens the primary sealing structure while forming a secondary sealing structure. The sealing end 31 and the metal gasket 5 squeeze the O-ring 6 in the annular groove 34 together, so that it fits tightly with the sealing end 31 and the metal gasket 5, so that a seal is formed between the sealing end 31 and the metal gasket 5. The metal gasket 5 and the outer end wall of the flow channel 4 squeeze the O-ring 6 in the groove 51 together, so that it fits tightly with the metal gasket 5 and the outer end wall of the flow channel 4, so that a seal is formed between the metal gasket 5 and the outer end wall of the flow channel 4. By using two O-rings 6, even if the liquid in the flow channel 4 leaks at the steel ball 1, it cannot leak out from the plug bolt 3.

[0035] Finally, when the steel ball 1 is injected into the flow channel 4 under high pressure and the plug bolt 3 locks the metal gasket 5 and the O-ring 6 at the filling port 2, a fastening glue is injected into the gap between the plug bolt 3 and the filling port 2. While filling and sealing the gap between the plug bolt 3 and the filling port 2, it can also limit the position of the plug bolt 3 to prevent the plug bolt 3 from loosening, thereby strengthening the secondary sealing structure while forming a tertiary sealing structure.

[0036] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A multi-stage sealing structure for a liquid composite node filling port, characterized in that: It includes a primary sealing structure and a secondary sealing structure. The primary sealing structure includes a steel ball injected into the flow channel under high pressure; the secondary sealing structure includes a plug bolt locked at the injection port, wherein the plug bolt includes a sealing end and a locking end, the sealing end is provided with a metal gasket and an O-ring, the locking end is provided with an external thread, the injection port includes a cavity end and a threaded end, the cavity end is directly connected to the flow channel, and the threaded end is provided with an internal thread matching the external thread of the locking end.

2. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: The multi-stage sealing structure also includes a third-stage sealing structure, which refers to the fastening glue injected into the injection port after the steel balls are injected and the plug bolts are locked.

3. The multi-stage sealing structure of the liquid composite node filling port according to claim 2, characterized in that: The fastening glue is waterproof glue.

4. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: After the plug bolt is locked to the filling port, the sealing end extends into the flow channel to support the steel ball.

5. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: There is one metal gasket, which is sleeved on the outer periphery of the sealing end; there are two O-rings, one of which is also sleeved on the outer periphery of the sealing end and located between the sealing end and the metal gasket, and the other is arranged on the end surface of the rubber gasket close to the flow channel.

6. The multi-stage sealing structure of the liquid composite node filling port according to claim 5, characterized in that: An annular groove is arranged on the outer periphery of the sealing end, and an O-ring is arranged in the annular groove.

7. The multi-stage sealing structure of the liquid composite node filling port according to claim 5, characterized in that: A groove is arranged on the end surface of the metal gasket close to the flow channel, and an O-ring is arranged in the groove.

8. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: There is interference fit between the steel ball and the flow channel.

9. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: The hardness of the steel ball is greater than the hardness of the flow channel.

10. The multi-stage sealing structure of the liquid composite node filling port according to claim 1, characterized in that: The end of the locking end of the plug bolt away from the sealing end thereof is provided with a hexagonal countersunk hole.

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