Liquid metal hydraulic pipeline with self-sealing function at connection port

Abstract

This invention discloses a metal hydraulic pipeline with a self-sealing function at the connection port, relating to the field of hydraulic pipeline technology. It includes an integrally formed pipe head and tail end. The pipe head is provided with a locking mechanism for engaging the pipe heads and tail ends of two adjacent sets of hydraulic pipelines. The locking mechanism includes an internally threaded ring sleeved on the pipe head. Both the pipe head and tail ends have externally threaded portions that engage with the internally threaded ring. An elastically notched metal ring is provided on the side of the inner rubber seat facing the opening of the pipe head. An incomplete circular cavity groove is provided on the pipe head to accommodate the elastically notched metal ring. This invention achieves "assembly-to-seal" at the connection port of the metal hydraulic pipeline through the integrated locking mechanism and the synergistic design of multi-stage dynamic sealing. Simultaneously, it utilizes fluid pressure to drive the inner rubber seat to form a self-tightening seal, possessing adaptive characteristics of "the higher the pressure, the tighter the seal; the faster the flow rate, the stronger the seal."

Description

Technical Field

[0001] This invention relates to the field of hydraulic pipeline technology, specifically to a metal hydraulic pipeline with a self-sealing function at the connection port. Background Technology

[0002] Hydraulic pipelines are specialized pipelines used in hydraulic systems to transmit working media (usually hydraulic oil). They are key components that connect hydraulic pumps, control valves, actuators (hydraulic cylinders or hydraulic motors), and other elements to form a complete fluid passage. As the core pressure-bearing component of the hydraulic transmission system, the sealing reliability of the connection ports of metal hydraulic pipelines directly determines the working performance and safety of the system.

[0003] Hydraulic pipeline connections currently rely on a combination of external sealing elements (such as O-rings and gaskets) and mechanical fastening structures such as threads or flanges to achieve sealing. This method requires that the sealing elements be assembled before mechanical locking during installation, which poses a direct risk of leakage due to missing, misaligned, or damaged sealing elements or inconsistent installation processes. Especially under pressure shock and cyclic fluctuation conditions in hydraulic systems, static sealing structures lack pressure self-adaptation capabilities and are prone to microscopic separation at the sealing interface, leading to instantaneous leakage or continuous micro-leakage. Therefore, a metal hydraulic pipeline with a self-sealing function at the connection port is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a metal hydraulic pipeline with a self-sealing function at the connection port, which has the advantages of eliminating the problem of missing or incorrect installation of seals, and dynamically improving the sealing performance according to the pressure of the hydraulic system, thus solving the problem of the lack of pressure self-adaptation capability of static sealing structures.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a metal hydraulic pipe with a self-sealing function at the connection port, comprising a pipe head end and a pipe tail end integrally formed at the ends of the hydraulic pipe, wherein the pipe head end is provided with a locking mechanism for engaging the pipe head end and the pipe tail end in two adjacent sets of hydraulic pipes; The locking mechanism includes an internally threaded ring sleeved on the head end of the pipe, and externally threaded portions that engage with the internally threaded ring on both the head end and tail end of the pipe. A positioning rubber seat is fixedly engaged on the inner circumferential surface of the tail end of the pipe. An inner holding rubber seat is provided on the side of the positioning rubber seat facing the open end of the head end of the pipe. A axial notch for accommodating the inner holding rubber seat is provided on the head end of the pipe. An elastic notch metal ring is provided on the side of the inner holding rubber seat facing the open end of the head end of the pipe. An incomplete circular cavity groove for accommodating the elastic notch metal ring is provided on the head end of the pipe. The tail end of the pipe is provided with a clearance outer ring groove for engaging the elastic notch metal ring. When the head end and tail end of the pipe are in a preliminary locking state, the elastic notch metal ring is simultaneously located in the incomplete circular cavity groove and the clearance outer ring groove. The pipe head end is provided with a ring sealing component on one side facing the pipe tail end for sealing the interface between the two.

[0006] Preferably, a hydrogenated nitrile rubber ring is snapped and fixed on the side of the inner holding rubber seat facing the positioning rubber seat, and the hydrogenated nitrile rubber ring is in close contact with the positioning rubber seat.

[0007] Preferably, when the tube head and tail are in a secondary locking state, the inner rubber seat and the elastic notched metal ring are in compressive contact.

[0008] Preferably, the outer peripheral surface of the tube tail end is in sliding contact with the elastic notched metal ring, and the outer peripheral surface of the tube tail end is integrally formed with an end bevel and a middle bevel. The inner rubber seat has the same shape as the outer circumferential surface of the tube tail end and is wedge-fitted.

[0009] Preferably, the ring sealing assembly includes an end elastic airbag fixedly connected to the open end face of the pipe head end, and the inner wall of the pipe head end includes an integrally formed sloping inner convex part, on which multiple sets of parallel-axis channels are opened, and the multiple sets of parallel-axis channels are all arranged parallel to the central axis of the pipe head end. The parallel channel includes an integrally formed constricting oral cavity, and a micro-diameter cavity is provided on the micro-diameter cavity that communicates with the constricting oral cavity for gas. The end of the micro-diameter cavity away from the constricting oral cavity is connected to the end elastic airbag for gas.

[0010] Preferably, the cross-sectional diameter of the oral cavity is smaller than that of the parallel channel.

[0011] Preferably, a polyurethane rubber ring is fitted on the outer circumferential surface of the pipe tail end, and a groove is provided on the pipe tail end for engaging the polyurethane rubber ring, with the polyurethane rubber ring in compressive contact with the inner wall of the pipe head end.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves "assembly-to-seal" at the connection port of metal hydraulic pipelines through the synergistic design of integrated locking mechanism and multi-stage dynamic seal, eliminating the risk of missing or misaligned seals in traditional installation; it utilizes fluid pressure to drive the inner rubber seat to form a self-tightening seal, and combines the Venturi effect to achieve flow-triggered sealing of the end airbag, thus possessing the adaptive characteristics of "the higher the pressure, the tighter the seal, and the faster the flow rate, the stronger the seal".

[0013] 2. This invention provides a static seal for the radial clearance of the pipeline by setting a polyurethane rubber ring. When the medium flows, the pressure pushes the inner rubber seat to move axially, pressing the elastic notch metal ring and making it fit more tightly against the side wall of the axial notch. Therefore, the higher the pressure in the pipeline, the greater this pressing force, thus achieving the purpose of pressure self-tightening.

[0014] 3. This invention applies the Venturi effect and Bernoulli's principle. When the medium flows through the constricted cavity with a sudden change in cross-section, the flow velocity increases and the pressure decreases. The medium is drawn into the elastic bladder at the end through the micro-diameter cavity, causing it to contract and tightly hold the joint between the head and tail ends of the pipe. This sealing action is automatically triggered by the flow of the medium, achieving the purpose of sealing as soon as the flow occurs. It is especially suitable for systems that operate intermittently or have frequent start-stop cycles. When there is no flow in the pipeline, the bladder does not move, and when there is flow, it automatically enhances the port seal. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the component where the tube head of the present invention is located; Figure 3 This is a schematic diagram of the component containing the positioning rubber seat of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the component where the tube tail end of the present invention is located; Figure 6 This is a schematic diagram of the component containing the parallel shaft channel of the present invention; Figure 7 This is a schematic diagram of the initial assembly state of the tube head and tube tail of the present invention; Figure 8 This is a schematic diagram showing the initial locking state of the tube head and tail ends of the present invention; Figure 9 This is a schematic diagram of the secondary locking state of the tube head and tail end of the present invention.

[0016] In the figure: 1. Pipe head end; 101. Inner convex part of the slope; 2. Pipe tail end; 201. End bevel; 202. Middle bevel; 3. Elastic notched metal ring; 4. Incomplete circular cavity groove; 5. Shaft notch; 6. Inner holding rubber seat; 7. Hydrogenated nitrile rubber ring; 8. Positioning rubber seat; 9. Relief outer ring groove; 10. Polyurethane rubber ring; 11. Parallel shaft channel; 12. Retracting oral cavity; 13. Micro-diameter cavity; 14. End elastic airbag. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1 to 9The present invention provides a technical solution: a metal hydraulic pipe with a self-sealing function at the connection port, comprising a pipe head end 1 and a pipe tail end 2 integrally formed at the ends of the hydraulic pipe, wherein the pipe head end 1 is provided with a locking mechanism for engaging the pipe head end 1 and the pipe tail end 2 in two adjacent sets of hydraulic pipes. The locking mechanism includes an internally threaded ring sleeved on the pipe head end 1. Both the pipe head end 1 and the pipe tail end 2 are provided with externally threaded portions that are threadedly engaged with the internally threaded ring. A positioning rubber seat 8 is fixedly engaged on the inner circumferential surface of the pipe tail end 2. An inner holding rubber seat 6 is provided on the side of the positioning rubber seat 8 facing the open end of the pipe head end 1. A axial notch 5 is provided on the pipe head end 1 to accommodate the inner holding rubber seat 6. An elastic notch metal ring 3 is provided on the side of the inner holding rubber seat 6 facing the open end of the pipe head end 1. An incomplete circular cavity groove 4 is provided on the pipe head end 1 to accommodate the elastic notch metal ring 3. The pipe tail end 2 is provided with a clearance outer ring groove 9 for engaging the elastic notch metal ring 3. When the pipe head end 1 and the pipe tail end 2 are in a locked state, the elastic notch metal ring 3 is simultaneously located at the positions of the incomplete circular cavity groove 4 and the clearance outer ring groove 9. The pipe head end 1 is provided with a ring sealing component on one side facing the pipe tail end 2 for sealing the interface between the two.

[0019] The outer peripheral surface of the tube tail end 2 is in sliding contact with the elastic notched metal ring 3, and the outer peripheral surface of the tube tail end 2 is integrally formed with an end bevel 201 and a middle bevel 202. The inner holding rubber seat 6 has the same shape as the outer peripheral surface of the tube tail end 2 and is wedge-fitted.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, when assembling two sets of metal hydraulic pipes, the tail end 2 of one set of metal hydraulic pipes is gradually inserted into the head end 1 of the other set of metal hydraulic pipes. Through the locking process of the adjacent head end 1 and tail end 2, the purpose of locking the two sets of hydraulic pipes is achieved.

[0021] Specifically, in the initial state, the elastic notched metal ring 3 is engaged in the position of the incomplete circular cavity groove 4. When the tail end 2 of the tube gradually extends into the head end 1 of the tube, the end bevel 201 first contacts the elastic notched metal ring 3. Under the push of the end bevel 201, the elastic notched metal ring 3 disengages from the position of the incomplete circular cavity groove 4 and follows the end bevel 201 into the shaft notch 5. Then, as the tail end 2 of the tube continues to extend, the elastic notched metal ring 3 contacts the inner holding rubber seat 6 and can no longer follow the movement of the tail end 2 of the tube, thereby causing relative movement between the tail end 2 of the tube and the elastic notched metal ring 3.

[0022] At the same time, when the middle inclined surface 202 passes the location of the elastic notched metal ring 3, since the outer diameter of the middle inclined surface 202 is larger than the outer diameter of the end inclined surface 201, the elastic notched metal ring 3 expands and deforms along its notch position under the compression of the middle inclined surface 202. The deformation process of the elastic notched metal ring 3 temporarily increases its cross-sectional diameter to adapt to the change in the outer diameter of the pipe tail end 2.

[0023] As the pipe tail end 2 continues to extend, when the outer annular groove 9 corresponds to the elastic notched metal ring 3, the presence of the outer annular groove 9 provides a certain space for the elastic notched metal ring 3 to recover its deformation. Therefore, in its current position, the elastic notched metal ring 3 can recover its deformation and be engaged within the outer annular groove 9. Figure 7 As shown, Figure 7 This is a schematic diagram of the initial assembly state of the pipe head end 1 and the pipe tail end 2. Afterwards, the pipe tail end 2 will no longer extend into the pipe head end 1, but will move a certain distance away from the pipe tail end 2 until the elastic notched metal ring 3 moves to the position of the incomplete circular cavity groove 4. There, it will be obstructed by the incomplete circular cavity groove 4, preventing the pipe tail end 2 from moving further away from the pipe head end 1. Figure 8 As shown, Figure 8 This diagram illustrates the initial locking state of the pipe head end 1 and the pipe tail end 2. At this point, the elastic notched metal ring 3 is simultaneously positioned at the incomplete circular cavity groove 4 and the clearance outer ring groove 9, and the pipe tail end 2 cannot detach from the pipe head end 1. However, in the initial locking state, although the pipe tail end 2 cannot continue to move horizontally from the pipe head end 1, it can extend back into the pipe head end 1 a certain distance under external force. Therefore, in actual use, by rotating the internal threaded ring set on the pipe head end 1, the internal threaded ring can be simultaneously threadedly connected with the internal threaded rings opened on the pipe head end 1 and the pipe tail end 2. Threaded holes that cooperate with the internal threaded rings can be opened on both the pipe head end 1 and the pipe tail end 2 to achieve the purpose of limiting the internal threaded rings through the locking bolt, thereby achieving the purpose of limiting the position of the pipe tail end 2 and preventing relative displacement between the pipe head end 1 and the pipe tail end 2.

[0024] Meanwhile, when the pipe head end 1 and pipe tail end 2 are in actual use and a medium flows inside, driven by the pressure of the medium flow, the inner rubber seat 6 can move in the shaft notch 5 until the end of the inner rubber seat 6 presses against the elastic notch metal ring 3, as... Figure 9 As shown, Figure 9 This is a schematic diagram of the secondary locking state of the pipe head end 1 and the pipe tail end 2. When the pipe head end 1 and the pipe tail end 2 are in the secondary locking state, the inner rubber seat 6 and the elastic notch metal ring 3 are in compressive contact. When the two are in compressive contact, the inner rubber seat 6 can fit tightly with the shaft notch 5, thereby preventing the flowing medium from escaping from the notch position of the elastic notch metal ring 3, thus achieving the purpose of self-sealing at the elastic notch metal ring 3.

[0025] To further ensure sealing, a hydrogenated nitrile rubber ring 7 is snapped and fixed on the side of the inner rubber seat 6 facing the positioning rubber seat 8. The hydrogenated nitrile rubber ring 7 is in close contact with the positioning rubber seat 8. The hydrogenated nitrile rubber ring 7 is provided at the connection position between the inner rubber seat 6 and the positioning rubber seat 8, and the hydrogenated nitrile rubber ring 7 always seals the connection between the two, thereby preventing the flowing medium from entering the shaft position notch 5.

[0026] Furthermore, a polyurethane rubber ring 10 is fitted on the outer circumferential surface of the pipe tail end 2, and a groove is provided on the pipe tail end 2 for engaging the polyurethane rubber ring 10, with the polyurethane rubber ring 10 in extrusion contact with the inner wall of the pipe head end 1.

[0027] like Figure 1 , Figure 7 , Figure 8 and Figure 9 As shown, when the tail end 2 of the pipe extends into the head end 1 of the pipe, the polyurethane rubber ring 10 fitted on it is pressed against the inner wall of the head end 1 of the pipe. The groove on the tail end 2 of the pipe can restrict the position of the polyurethane rubber ring 10 and at the same time provide a certain space for the deformation of the polyurethane rubber ring 10. After the head end 1 and the tail end 2 of the pipe are assembled, the polyurethane rubber ring 10 is compressed by the head end 1 and the tail end 2 of the pipe and undergoes a slight deformation, thereby achieving the purpose of sealing the small gap between the head end 1 and the tail end 2 of the pipe.

[0028] In one preferred embodiment, the ring sealing assembly includes an end elastic airbag 14 fixedly connected to the open end face of the pipe head end 1, and the inner wall of the pipe head end 1 includes an integrally formed slope inner protrusion 101, on which multiple sets of parallel shaft channels 11 are opened, and the multiple sets of parallel shaft channels 11 are all arranged parallel to the central axis of the pipe head end 1. The parallel channel 11 includes an integrally formed oral cavity 12. A micro-diameter cavity 13 is provided on the oral cavity 12, which is in gas communication with the oral cavity 12. The end of the micro-diameter cavity 13 away from the oral cavity 12 is in gas communication with the end elastic airbag 14. The cross-sectional diameter of the oral cavity 12 is smaller than that of the parallel channel 11.

[0029] like Figure 2 , Figure 3 and Figure 6As shown, an end elastic airbag 14 is bonded and fixed at the end position of the pipe head 1 facing the pipe tail 2, and the end elastic airbag 14 has an L-shaped structure. The medium temporarily stored in the end elastic airbag 14 is the same as the medium required to flow inside the hydraulic pipeline during use. When there is liquid medium flowing in the pipe head 1, the liquid medium will flow in the parallel shaft channel 11. The cross-sectional dimensions of the integrally formed constricting mouth channel 12 on the parallel shaft channel 11 are different from those of the parallel shaft channel 11. Therefore, under the Venturi effect, when the medium flows through the location of the constricting mouth channel 12, the flow velocity at the constricting mouth channel 12 will increase. At the same time, under the Bernoulli effect, due to the increase in flow velocity at the constricting mouth channel 12, a certain low pressure phenomenon will be generated at this location.

[0030] The tube head 1 has multiple sets of micro-diameter cavities 13 that communicate with the oral cavity 12. The end of the micro-diameter cavity 13 away from the oral cavity 12 is connected to the end elastic airbag 14. When a medium continuously flows through the tube tail 2, the medium in the end elastic airbag 14 is gradually drawn into the micro-diameter cavity 13 and the oral cavity 12 under the low pressure. This causes the end elastic airbag 14 to gradually contract and completely tighten at the junction of the tube head 1 and the tube tail 2. When the medium continues to flow in the tube head 1, the end elastic airbag 14 can always remain in a tight state, thereby further sealing the junction of the tube head 1 and the oral cavity 12.

[0031] It should be noted that, in actual use, adhesive can be applied to the side of the end elastic airbag 14 facing the tail end 2 of the tube, so that when the end elastic airbag 14 contracts, it can contract towards the connection position of the tube head end 1 and the tube tail end 2, and then when it is fully contracted, it can be bound at that position, thereby further sealing the connection position between the tube head end 1 and the tube tail end 2.

[0032] Therefore, after the pipe head 1 and pipe tail 2 are locked, the presence of the inner retaining rubber seat 6 and the hydrogenated nitrile rubber ring 7 can seal the gap between the pipe tail 2 and the positioning rubber seat 8. The presence of the polyurethane rubber ring 10 can seal the gap between the inner wall of the pipe head 1 and the outer circumferential surface of the pipe tail 2. The presence of the end elastic airbag 14 can seal the gap between the port of the pipe head 1 and the outer circumferential surface of the pipe tail 2. Thus, the continuous sealing purpose is achieved through the three sealing elements. The multiple sealing can improve the fault tolerance of the sealing elements. When the medium flows in the hydraulic pipeline, the sealing performance can be further improved through the flow of the medium. Therefore, when there are hydraulic system pressure shocks and cyclic fluctuations, the sealing stability of the connection between the two sets of hydraulic pipelines can be improved, thereby ensuring the sealing effect.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal hydraulic pipe with a self-sealing function at the connection port, comprising a pipe head end (1) and a pipe tail end (2) integrally formed at the ends of the hydraulic pipe, characterized in that: The pipe head end (1) is provided with a locking mechanism for engaging the pipe head end (1) and pipe tail end (2) of two adjacent sets of hydraulic pipelines; The locking mechanism includes an internal threaded ring sleeved on the pipe head end (1), and external threaded portions that are threaded to the internal threaded ring are provided on both the pipe head end (1) and the pipe tail end (2). A positioning rubber seat (8) is fixedly engaged on the inner circumferential surface of the pipe tail end (2). An inner holding rubber seat (6) is provided on the side of the positioning rubber seat (8) facing the opening end of the pipe head end (1). A axial notch (5) for accommodating the inner holding rubber seat (6) is provided on the pipe head end (1). An elastic notch metal ring (3) is provided on the side of the inner holding rubber seat (6) facing the opening end of the pipe head end (1). An incomplete circular cavity groove (4) for accommodating the elastic notch metal ring (3) is provided on the pipe head end (1). The pipe tail end (2) is provided with a clearance outer ring groove (9) for engaging the elastic notch metal ring (3). When the pipe head end (1) and the pipe tail end (2) are in a preliminary locking state, the elastic notch metal ring (3) is simultaneously located at the positions of the incomplete circular cavity groove (4) and the clearance outer ring groove (9). The pipe head end (1) is provided with a ring sealing component on one side facing the pipe tail end (2) for sealing the interface between the two.

2. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 1, characterized in that: The inner holding rubber seat (6) is fixedly attached to the side of the positioning rubber seat (8) with a hydrogenated nitrile rubber ring (7), and the hydrogenated nitrile rubber ring (7) is in close contact with the positioning rubber seat (8).

3. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 1, characterized in that: When the tube head end (1) and tube tail end (2) are in a secondary locking state, the inner rubber seat (6) and the elastic notched metal ring (3) are in extrusion contact.

4. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 2, characterized in that: The outer peripheral surface of the tube tail end (2) is in sliding contact with the elastic notched metal ring (3), and the outer peripheral surface of the tube tail end (2) is integrally formed with an end bevel (201) and a middle bevel (202). The inner rubber seat (6) has the same shape as the outer circumferential surface of the tube tail end (2) and is wedge-fitted.

5. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 1, characterized in that: The ring sealing assembly includes an end elastic airbag (14) fixedly connected to the open end face of the pipe head end (1). The inner wall of the pipe head end (1) includes an integrally formed slope inner protrusion (101). Multiple sets of parallel shaft channels (11) are opened on the slope inner protrusion (101). The multiple sets of parallel shaft channels (11) are all arranged parallel to the central axis of the pipe head end (1). The parallel channel (11) includes an integrally formed oral cavity (12), and a micro-diameter cavity (13) is provided on the micro-diameter cavity (13) that communicates with the oral cavity (12) through gas. The end of the micro-diameter cavity (13) away from the oral cavity (12) is connected to the end elastic airbag (14) through gas.

6. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 5, characterized in that: The cross-sectional diameter of the oral cavity (12) is smaller than that of the parallel shaft channel (11).

7. A metal hydraulic pipeline with a self-sealing function at the connection port according to claim 5, characterized in that: The outer circumferential surface of the pipe tail end (2) is fitted with a polyurethane rubber ring (10), and a groove is provided on the pipe tail end (2) for snapping the polyurethane rubber ring (10). The polyurethane rubber ring (10) is in extrusion contact with the inner wall of the pipe head end (1).

Images