Fluid pressure container and bottom sealing and side opening nozzle structure suitable for fluid pressure container

Abstract

The invention discloses a fluid pressure vessel and a bottom sealing side opening nozzle structure suitable for the fluid pressure vessel, and relates to the technical field of pressure vessels, the fluid pressure vessel comprises a main body and a pipeline of the pressure vessel, the pipeline is connected to the upper end of the main body, the outer side wall of the main body is surrounded by a protection net, and the two ends of the protection net are connected with collecting mechanisms; a linkage mechanism is arranged on the outer side wall of the collecting mechanism, the linkage mechanism responds to the change of the air pressure in the main body to drive the collecting mechanism to operate so as to adjust the restraining tightness of the protecting net to the main body, and when the air pressure in the main body is increased, the linkage mechanism drives the collecting mechanism to tighten the protecting net; the problems that an existing fluid pressure container structure is static and fixed, cannot respond to dynamic pressure changes to conduct self-adaptive enhancement, and lacks an active safety mechanism linked with internal pressure, so that the safety, reliability and service life are insufficient under pressure impact and cyclic load, and meanwhile, an external reinforcing structure is low in efficiency are solved.

Description

Technical Field

[0001] This invention relates to the field of pressure vessel technology, specifically to a fluid pressure vessel and a bottom-sealed side-opening structure suitable for fluid pressure vessels. Background Technology

[0002] Fluid pressure vessels are critical infrastructure equipment in industrial systems, functioning to store pressurized fluids, balance system pressure fluctuations, and serve as emergency energy reserves. A typical pressure vessel consists of a main body and connecting pipelines, with an internal compressible chamber formed by pre-filling with inert gas or installing an elastic diaphragm. During operation, as system pressure increases, the working medium is forced into the vessel, compressing the internal gas chamber; when system pressure decreases, the compressed gas expands, expelling the medium to replenish the system, thus maintaining pressure stability. Existing technologies primarily ensure safety under design pressure by optimizing the main body shape, using high-strength materials, and incorporating multi-layered composite structures; essentially, they are static pressure-bearing systems based on fixed design parameters.

[0003] However, existing fluid pressure vessels have significant limitations. Their structural strength and safety are fixed after design and manufacturing, making them unable to respond to the complex and ever-changing pressure conditions in actual operation. Faced with unexpected pressure shocks or long-term cyclic pressure loads, this static structure lacks adaptive adjustment capabilities, potentially leading to localized stress concentration, accelerated material fatigue, and impacting service life and reliability. Furthermore, existing vessels have limited functionality, primarily focusing on internal pressure control and lacking proactive reinforcement and protection mechanisms for their own shell condition, resulting in insufficient safety redundancy under extreme conditions. In addition, traditional external auxiliary reinforcement structures are mostly fixed and cannot intelligently link with internal pressure conditions, leading to bulky and inefficient equipment. To address the aforementioned problems, this paper provides a fluid pressure vessel and a bottom-sealed side-opening structure suitable for fluid pressure vessels. Summary of the Invention

[0004] The purpose of this invention is to provide a fluid pressure vessel and a bottom-sealed side opening structure suitable for fluid pressure vessels, in order to solve the problems mentioned in the background art, such as the existing fluid pressure vessel structure being statically fixed, unable to adapt to dynamic pressure changes for adaptive reinforcement, and lacking an active safety mechanism linked to internal pressure, resulting in insufficient safety, reliability and service life under pressure shock and cyclic load, while the external reinforcement structure has low efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fluid pressure vessel, comprising a pressure vessel body and a pipeline, the pipeline being connected to the upper end of the body, the outer side wall of the body being surrounded by a protective net, the two ends of the protective net being connected to a gathering mechanism, and the outer side wall of the gathering mechanism being provided with a linkage mechanism. The linkage mechanism responds to changes in the internal air pressure of the main body and drives the tightening mechanism to adjust the tightness of the protective net on the main body. When the internal air pressure of the main body increases, the linkage mechanism drives the tightening mechanism to tighten the protective net.

[0006] In a further embodiment, the main body includes a tank body and a tank cover, with the tank cover fixedly connected to the upper end of the tank body and the pipe fixedly connected to the tank cover.

[0007] In a further embodiment, the protective netting consists of multiple arc-shaped frames connected by rotating chain pins.

[0008] In a further embodiment, the retraction mechanism includes a side plate, connecting strips, and first piston rods. Two connecting strips are provided, and the two connecting strips are rotatably connected to both ends of the protective net by chain pins. The side plate is located between the two connecting strips. The connecting strips have a main air passage and multiple auxiliary air passages inside, and the main air passage and multiple auxiliary air passages are interconnected. One end of multiple first piston rods is uniformly fixedly connected to one side of the connecting strip in a straight line, and the other end of the first piston rods is sealed and slidably inserted into the auxiliary air passages of the side plate.

[0009] In a further embodiment, the linkage mechanism includes a cylinder, a second piston rod, and an air pipe. The cylinder is fixedly mounted on the end face of the side plate, the second piston rod is slidably mounted inside the cylinder, and the air pipe is connected to the lower end of the cylinder.

[0010] In a further embodiment, the cylinder has a main chamber and two auxiliary chambers inside, with the two auxiliary chambers connected to the upper end of the main chamber. The second piston rod includes a connecting plate and two rods. The connecting plate is slidably installed in the main chamber, and the two rods are respectively sealed and slidably installed in the two auxiliary chambers. The cylinder is connected to the can cover and the side plate through two pipes respectively. One auxiliary chamber is connected to the interior of the main body through a pipe, and the other auxiliary chamber is connected to the interior of the side plate through a pipe.

[0011] In a further embodiment, a triggering mechanism is installed inside the cylinder, which applies a thrust to the second piston rod.

[0012] In a further embodiment, the triggering mechanism includes a spring, a lead screw, and a sliding block. The spring is installed inside the cylinder to apply an upward elastic force to the second piston rod. The lead screw is rotatably installed inside the cylinder, and the spring is sleeved on the lead screw. The sliding block is slidably installed inside the cylinder and threadedly connected to the lead screw. The lower end of the spring is fixedly connected to the upper end of the sliding block.

[0013] In a further embodiment, the lower end of the second piston rod is provided with a sliding hole that matches the lead screw, and the lower end of the lead screw is connected to a driving component for driving the lead screw to rotate.

[0014] The bottom-sealed side-opening structure is applicable to any of the fluid pressure vessels in the above claims, including a sealing ring, an annular groove at the lower end of the pipe, the sealing ring being fixedly fitted into the annular groove, and a nut being threaded onto the outer side wall of the pipe for fixing the pipe to the tank cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention relates to a fluid pressure vessel and a bottom-sealed side opening structure suitable for fluid pressure vessels. By constructing a closed-loop adaptive reinforcement system through a protective net, a convergence mechanism, and a drive mechanism linked to the internal pressure on the outside of the main body, the constraint force of the protective net on the tank can be adjusted in real time and automatically according to the changes in internal air pressure. This solves the problems of existing pressure vessel structures being statically fixed and unable to respond to dynamic pressure changes for adaptive reinforcement, as well as insufficient safety redundancy and reliability under pressure shock and cyclic load. 2. The adaptive enhancement mechanism of the fluid pressure vessel is automatically activated when the pressure rises, which can provide the tank with immediate external support that matches the internal pressure, forming a dynamic safety protection layer. This effectively suppresses the deformation trend of the tank under abnormal high pressure, significantly improves the intrinsic safety level of the equipment, and reduces the risk of structural failure caused by pressure fluctuations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a fluid pressure vessel and a bottom-sealed side opening structure suitable for fluid pressure vessels, as proposed in this invention. Figure 2 This is a schematic diagram of the main structure of a fluid pressure vessel and a bottom sealing side opening structure suitable for fluid pressure vessels proposed in this invention. Figure 3 This is a schematic diagram of a fluid pressure vessel and a protective mesh structure suitable for a bottom sealing side opening structure of a fluid pressure vessel, as proposed in this invention. Figure 4 This is a partial structural diagram of a fluid pressure vessel and a protective mesh suitable for a bottom sealing side opening structure of a fluid pressure vessel, as proposed in this invention. Figure 5 This is a schematic diagram of the connection structure of a fluid pressure vessel and a bottom sealing side opening structure suitable for fluid pressure vessels, as proposed in this invention; Figure 6 This is a schematic diagram of a fluid pressure vessel and a convergence mechanism suitable for a bottom-sealed side opening structure of a fluid pressure vessel, as proposed in this invention. Figure 7 This is a cross-sectional view of a fluid pressure vessel and a convergence mechanism suitable for a bottom-sealed side opening structure of a fluid pressure vessel, as proposed in this invention. Figure 8 This is a cross-sectional view of a fluid pressure vessel and a cylinder with a bottom-sealed side opening structure suitable for fluid pressure vessels, as proposed in this invention. Figure 9 This is a schematic diagram of a lead screw and sliding block connection structure for a fluid pressure vessel and a bottom sealing side opening structure suitable for a fluid pressure vessel, as proposed in this invention. Figure 10 This is a schematic diagram of a half-section of a fluid pressure vessel and a can lid with a bottom-sealed side opening structure suitable for fluid pressure vessels, as proposed in this invention. Figure 11 This is a cross-sectional view of a fluid pressure vessel and a can lid with a bottom-sealed side opening structure suitable for fluid pressure vessels, as proposed in this invention. Figure 12 This is an exploded view of a fluid pressure vessel and a pipe structure suitable for a bottom-sealed side-opening structure for fluid pressure vessels, as proposed in this invention.

[0017] In the diagram: 1. Main body; 11. Tank body; 111. Limiting ring; 12. Tank cover; 2. Pipe; 21. Sealing ring; 22. Nut; 3. Protective net; 4. Retraction mechanism; 41. Side plate; 42. Connecting strip; 43. First piston rod; 5. Linkage mechanism; 51. Cylinder; 52. Second piston rod; 53. Air pipe; 6. Triggering mechanism; 61. Spring; 62. Lead screw; 63. Sliding block. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-12 This embodiment provides a fluid pressure vessel and a bottom-sealed side-opening structure suitable for fluid pressure vessels. The fluid pressure vessel includes a main body 1 and a pipe 2. The pipe 2 is connected to the upper end of the main body 1. This is the basic connection form of a pressure vessel, used for the inflow and outflow of media.

[0020] like Figure 1As shown, the outer wall of the main body 1 is surrounded by a protective net 3. Both ends of the protective net 3 are connected to a tightening mechanism 4. A linkage mechanism 5 is provided on the outer wall of the tightening mechanism 4. The linkage mechanism 5 can respond to changes in the internal air pressure of the main body 1 and drive the tightening mechanism 4 to operate, thereby adjusting the tightness of the constraint of the protective net 3 on the main body 1. When the internal air pressure of the main body 1 increases, the linkage mechanism 5 drives the tightening mechanism 4 to tighten the protective net 3. When the internal pressure of the protective net 3 increases, it can actively provide external constraint through the tightening mechanism 4 and the linkage mechanism 5. This constraint force increases synchronously with the increase of internal pressure, forming an intelligent negative feedback enhancement system.

[0021] like Figure 2 As shown, the main body 1 includes a tank body 11 and a tank cover 12. The tank cover 12 is fixedly connected to the upper end of the tank body 11 via flange connections or other means, and the pipe 2 is fixedly connected to the tank cover 12. This split structure is a common form of pressure vessel, which facilitates processing and internal maintenance. Limiting rings 111 are fitted on both the upper and lower sides of the outer wall of the tank body 11, and the protective net 3 can be engaged between the two limiting rings 111. The limiting rings 111 provide precise axial positioning for the installation of the protective net 3, preventing the protective net 3 from shifting or tilting during use, ensuring that the constraint force applied by the protective net 3 is always uniformly applied to the intended area of ​​the tank body 11, and guaranteeing the stability and reliability of the reinforcement effect.

[0022] like Figure 3 and Figure 4 As shown, the protective net 3 consists of multiple arc-shaped frames connected by rotatable chain pins. This multi-segment hinged structure gives the protective net 3 the necessary flexibility and retractability, allowing it to fit tightly against the cylindrical outer wall of the tank 11 and contract evenly towards the center during shrinkage, avoiding localized stress concentration on the surface of the tank 11. The protective net 3 can be made of high-strength metal to ensure it can withstand the enormous circumferential contraction force without plastic deformation or breakage. Furthermore, the inner wall of the protective net 3 (the surface that fits against the tank 11) can be fitted with a pad, which can be made of a material and form similar to that of a heat-dissipating silicone pad. The pad creates a flexible contact between the protective net 3 and the outer wall of the tank 11, avoiding wear or fretting corrosion that may be caused by hard metal-to-metal contact. The pad also has good thermal conductivity, efficiently dissipating the heat generated inside the tank 11 due to medium compression or the process into the surrounding air through the frame of the metal protective net 3, thus providing both buffer protection and auxiliary heat dissipation.

[0023] like Figure 4 and Figure 6As shown, the tightening mechanism 4 is a key transmission component connecting the protective net 3 and the linkage mechanism 5. The tightening mechanism 4 includes a side plate 41, connecting bars 42, and a first piston rod 43. Two connecting bars 42 are provided, and the two connecting bars 42 are rotatably connected to both ends of the protective net 3 via chain pins. The side plate 41 serves as a fixed base, located between the two connecting bars 42. Figure 6 and Figure 7 As shown, the connecting strip 42 has a main air passage and multiple auxiliary air passages inside, and the main air passage and multiple auxiliary air passages are interconnected. One end of multiple first piston rods 43 is uniformly fixed to one side of the connecting strip 42 in a straight line, and the other end of the first piston rod 43 is sealed and slidably inserted into the auxiliary air passage of the side plate 41. Its working principle is that when an external force drives the first piston rod 43 to retract into the side plate 41, the first piston rod 43 will pull the connecting strip 42 to which it is located, so that the two connecting strips 42 are closer to each other. The movement of the connecting strip 42 directly drives the two ends of the protective net 3 to retract towards the center, thereby reducing the diameter of the entire protective net 3 and applying a radial constraint force to the tank 11. The linear motion of the first piston rod 43 is efficiently and directly converted into the radial retraction motion of the entire protective net 3, which has the advantages of clear transmission path and high mechanical efficiency. The side plate 41 provides the necessary reverse force point for the first piston rod 43, which is the structural basis for the realization of the entire retraction action.

[0024] Linkage mechanism 5 is the system's control center, responsible for sensing pressure and outputting power. For example... Figure 8 As shown, the linkage mechanism 5 includes a cylinder 51, a second piston rod 52, and an air pipe 53. The cylinder 51 is fixedly mounted on the end face of the side plate 41. The second piston rod 52 is slidably mounted inside the cylinder 51. The air pipe 53 is connected to the lower end of the cylinder 51. The air pipe 53 is mainly used to connect the inside of the cylinder 51 with the external atmosphere, balance the air pressure, and ensure that the second piston rod 52 does not generate additional damping due to air compression or rarefaction when sliding inside the cylinder 51, thus ensuring smooth operation and fast response.

[0025] Specifically, the cylinder 51 has a main chamber and two auxiliary chambers, which are connected to the upper end of the main chamber. The second piston rod 52 includes a connecting plate and two rods. The connecting plate is slidably installed in the main chamber, and the two rods are respectively sealed and slidably installed in the two auxiliary chambers. The cylinder 51 is connected to the tank cover 12 and the side plate 41 through two independent pipes. One auxiliary chamber is connected to the interior of the main body 1 through a pipe, and the other auxiliary chamber is connected to the interior of the side plate 41 through a pipe. This air circuit connection constitutes a closed pressure sensing and power transmission system. Its beneficial effect is that the pressure inside the tank 11 is directly led to one end face of the second piston rod 52 as a control signal, while the movement of the second piston rod 52 changes the air pressure inside the side plate 41 through the other rod as a drive signal, realizing the mechanical transmission and conversion of pressure signals without attenuation.

[0026] To ensure the system only activates when the pressure exceeds a certain threshold, avoiding frequent operation under normal working pressure, a trigger mechanism 6 is installed inside cylinder 51. The trigger mechanism 6 applies a preset thrust to the second piston rod 52. The trigger mechanism 6 sets an adjustable pressure start-up threshold for the system; only when the force generated by the air pressure inside tank 11 is sufficient to overcome this preset force will the second piston rod 52 begin to move, thereby driving the retraction mechanism 4. This gives the system an intelligent "on-demand enhancement" characteristic, saving energy, reducing unnecessary wear on mechanical parts, and extending the overall lifespan of the system.

[0027] like Figure 8 As shown, the triggering mechanism 6 includes a spring 61, a lead screw 62, and a sliding block 63. The spring 61 is installed inside the cylinder 51, and its function is to directly apply an upward elastic force to the second piston rod 52. The lead screw 62 is rotatably installed inside the cylinder 51, and the spring 61 is sleeved on the lead screw 62. The sliding block 63 is slidably installed inside the cylinder 51, and the sliding block 63 is threadedly connected to the lead screw 62. The lower end of the spring 61 is fixedly connected to the upper end of the sliding block 63. By rotating the lead screw 62, the sliding block 63 can be driven to move up and down along the axial direction of the lead screw 62. When the sliding block 63 moves upward, it compresses the spring 61, thereby increasing the upward thrust of the spring 61 on the second piston rod 52, thus increasing the system's pressure trigger threshold. Conversely, lowering the sliding block 63 lowers the threshold. The beneficial effects of this design are obvious, achieving a continuous, linear, and precise pressure threshold adjustment method. Operators can flexibly and conveniently set the system start point according to the specific operating parameters of the pressure vessel. The screw drive mechanism consisting of lead screw 62 and sliding block 63 has self-locking properties. After adjustment, the threshold value is stable and will not change unexpectedly due to vibration or impact.

[0028] The lower end of the second piston rod 52 has a sliding hole that matches the lead screw 62. The upper end of the lead screw 62 is a smooth insert that can slide freely within the sliding hole of the second piston rod 52. The outer wall of the insert of the lead screw 62 has a vertical groove, which facilitates air exchange between the inside and outside of the sliding hole and prevents the formation of an air cushion or vacuum inside the sliding hole when the second piston rod 52 slides up and down, ensuring that the action response of the second piston rod 52 is rapid and without lag.

[0029] The lower end of the lead screw 62 is connected to a drive component for rotating the lead screw 62. The drive component can be a handwheel, screw head, rocker arm, or other easily operable form. Figure 9As shown, the drive component is a screw head. The screw head allows for the application of significant torque using standard tools such as wrenches, making the adjustment of the preset force easier, especially in applications requiring high spring stiffness and preload, ensuring a smooth and precise adjustment process. The drive component is exposed outside the cylinder 51, facilitating on-site adjustment and maintenance by operators.

[0030] When the device is ready to operate, a pressure start-up threshold is first set through the trigger mechanism 6 based on the design working pressure and safety margin of the pressure vessel. The operator uses a tool to rotate the drive component, which drives the lead screw 62 to rotate. The lead screw 62 drives the sliding block 63 to move upward, compressing the spring 61. The spring 61 then generates an upward preset thrust on the second piston rod 52. Before the internal air pressure of the main body 1 reaches the preset threshold, this preset thrust is sufficient to balance the downward force generated by the air pressure inside the tank transmitted through the pipeline to one end face of the second piston rod 52. At this time, the entire system is in standby mode, the second piston rod 52 remains stationary, and the retraction mechanism 4 and the protective net 3 do not operate.

[0031] When the internal air pressure of the main body 1 continues to rise due to work demands and exceeds a preset threshold, the downward force acting on the second piston rod 52 will be greater than the upward thrust provided by the spring 61. This force difference will push the second piston rod 52 to begin moving downward. As the second piston rod 52 moves downward, both rods of the second piston rod 52 move downward synchronously, increasing the volume of the secondary chamber connected to the inside of the tank 11. The increased volume of the secondary chamber connected to the inside of the main body 1 creates a local negative pressure, which draws in gas from the inside of the main body 1 through the pipeline. At the same time, the volume of another secondary chamber connected to the inside of the side plate 41 also increases synchronously, similarly creating a local negative pressure. This negative pressure is transmitted through the pipeline to the main air passage and multiple secondary air passages inside the side plate 41, causing the overall air pressure inside the side plate 41 to decrease.

[0032] The negative pressure generated inside the side plate 41 acts directly on the end faces of the multiple first piston rods 43. Since the other end of the first piston rod 43 is exposed to the atmosphere or under a reference pressure, this pressure difference creates a net force on the end face of the first piston rod 43 that causes it to contract inward toward the side plate 41. Driven by this force, the first piston rod 43 begins to contract and move inward toward the side plate 41.

[0033] The movement of the first piston rod 43 pulls the two connecting bars 42 closer together. The movement of the connecting bars 42 causes the two ends of the protective net 3 to converge towards the center, thereby causing the entire protective net 3 to radially contract. The contracted protective net 3, through its inner flexible padding layer, applies a uniform radial constraint force to the outer wall of the tank 11. This external constraint force effectively counteracts part of the circumferential tensile stress generated by the internal pressure of the tank 11, reducing the actual net stress borne by the wall material of the tank 11, thereby improving the instantaneous pressure bearing capacity and long-term fatigue life of the container.

[0034] When the internal pressure of the tank 11 decreases, the downward force acting on the second piston rod 52 decreases. Under the restoring force of the spring 61, the second piston rod 52 begins to move upward. As the second piston rod 52 moves upward, both rods move upward synchronously, compressing the two auxiliary chambers respectively, increasing their internal air pressure. The pressure in the auxiliary chamber connected to the side plate 41 increases, and air is pumped into the side plate 41 through the pipeline, restoring the internal air pressure of the side plate 41. The pressure at both ends of the first piston rod 43 returns to equilibrium, and it extends outward under the action of external atmospheric pressure or the auxiliary reset mechanism. The restraining force of the protective net 3 decreases or is completely released, and the system returns to the ready-to-trigger state, ready to respond to the next pressure increase.

[0035] The protective mesh 3, as the core reinforcing structure of this invention, plays a crucial role in providing a dynamic and adaptive external mechanical constraint for the tank 11. This constraint force is linked to the internal pressure through a purely mechanical feedback mechanism, automatically increasing as the internal pressure rises. This allows the protective mesh 3 to actively resist the expansion tendency of the tank wall, significantly reducing the net stress actually borne by the material of the tank 11. This not only improves the instantaneous safety margin of the pressure vessel under abnormally high pressure, but more importantly, it effectively suppresses the stress amplitude caused by alternating pressure, thereby significantly delaying the initiation and propagation of fatigue cracks and extending the overall service life. Furthermore, the metal mesh structure of the protective mesh 3, combined with its inner heat-conducting pad layer, forms a reinforced heat dissipation surface attached to the outer wall of the tank 11, which facilitates rapid heat dissipation during operation and enhances the thermal stability and reliability of the system.

[0036] Another important improvement of this invention lies in the connection and sealing structure of the pipe 2. An annular groove is formed at the lower end of the pipe 2, within which a sealing ring 21 is fixedly fitted. A nut 22 is threaded onto the outer wall of the pipe 2. The nut 22 is used to secure the pipe 2 to the can lid 12. Specifically, during installation, a protruding ring is formed on the outer wall of the pipe 2 near its lower edge. The installation process involves inserting the pipe 2 into the center hole of the can lid 12 from bottom to top, so that the upper end of the pipe 2 protrudes from the top of the can lid 12. At this time, the ring is secured below the can lid 12, preventing the pipe 2 from accidentally detaching from the top of the can lid 12. Then, the nut 22 is fitted onto the pipe 2 and slid downwards to the threaded portion of the outer wall of the pipe 2, and the nut 22 is tightened. The tightened nut 22 and the ring on the pipe 2 together form a clamping force on the can lid 12, thereby firmly fixing the pipe 2. It should be particularly noted that the annular groove at the lower end of the pipe 2 is the location of the traditional "side-opening" sealing structure. Traditional designs place this annular groove on the side wall of pipe 2, while this invention innovatively places the annular groove (side opening) on ​​the bottom end face of pipe 2. This bottom sealing design makes the sealing ring 21 the lowest point of the entire fluid channel, allowing the medium to be completely and thoroughly emptied when discharged under gravity. The inner wall of pipe 2 above the sealing ring 21 is smooth and continuous, without any steps, grooves, or gaps, fundamentally eliminating sanitary dead spots for liquid residue, impurity accumulation, and bacterial growth. After the sealing ring 21 is installed, the outer ring of the sealing ring 21 expands radially under the axial locking force applied by its own elasticity, thus tightly fitting the inner wall of the center hole of the can lid 12. At the same time, the inner ring of the sealing ring 21 is precisely squeezed into the annular groove at the bottom of pipe 2, forming an interference fit with each surface of the annular groove. Especially after the internal pressure of the main body 1 is increased, the sealing ring 21 will undergo slight deformation, further filling the gap between the can lid 12 and pipe 2. This dual-fitting mechanism not only forms an effective sealing barrier in both the radial and axial directions of pipe 2, completely blocking the path of media leakage, but also utilizes the physical restraint of the annular groove to firmly lock the sealing ring 21 onto pipe 2. This fundamentally eliminates the risk of axial movement, circumferential rotation, or accidental detachment of the sealing ring 21 under working vibration or pressure fluctuations, ensuring the long-term stability and reliability of the sealing interface. Furthermore, when the sealing ring 21 needs to be replaced due to aging, maintenance personnel do not need to disassemble the entire pipe 2. They only need to open the tank cover 12, loosen the nut 22, and slightly lower the pipe 2 to expose and replace the sealing ring 21 within the annular groove. The entire maintenance process is quick and convenient, significantly saving downtime and maintenance costs.

[0037] In summary, compared to existing static pressure vessel designs, this invention employs a dynamic adaptive reinforcement mechanism, resolving the core contradiction between structural safety and lightweight equipment under high-pressure conditions, as well as the sanitary dead zones and maintenance inconvenience issues inherent in traditional pipeline sealing structures. Through a series of purely mechanical structures, this invention innovatively achieves self-sensing of pressure, self-setting of thresholds, and self-adjustment of constraint forces, cleverly transforming the "load" of working pressure into the "power" for structural reinforcement. This design not only significantly improves the safety margin and service life of the pressure vessel under fluctuating loads but also completely eliminates the risk of fluid residue through its unique bottom sealing interface, and greatly reduces the complexity and cost of daily maintenance.

[0038] 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 fluid pressure vessel, comprising a body (1) of the pressure vessel and a pipe (2), the pipe (2) being connected to the upper end of the body (1), characterized in that: The outer wall of the main body (1) is surrounded by a protective net (3), and the two ends of the protective net (3) are connected to a gathering mechanism (4). The outer wall of the gathering mechanism (4) is provided with a linkage mechanism (5). The linkage mechanism (5) responds to the change in the internal air pressure of the main body (1) and drives the tightening mechanism (4) to operate, so as to adjust the tightness of the constraint of the protective net (3) on the main body (1). When the internal air pressure of the main body (1) increases, the linkage mechanism (5) drives the tightening mechanism (4) to tighten the protective net (3).

2. A fluid pressure vessel according to claim 1, characterized in that: The main body (1) includes a tank body (11) and a tank cover (12). The tank cover (12) is fixedly connected to the upper end of the tank body (11), and the pipe (2) is fixedly connected to the tank cover (12).

3. A fluid pressure vessel according to claim 2, characterized in that: The protective net (3) is composed of multiple arc-shaped frames, which are rotatably connected by chain pins.

4. A fluid pressure vessel according to claim 3, characterized in that: The gathering mechanism (4) includes a side plate (41), a connecting strip (42) and a first piston rod (43). There are two connecting strips (42), and the two connecting strips (42) are rotatably connected to the two ends of the protective net (3) by a chain pin. The side plate (41) is located between the two connecting strips (42). The connecting strip (42) has a main air passage and multiple auxiliary air passages inside, and the main air passage and multiple auxiliary air passages are interconnected. One end of multiple first piston rods (43) is evenly fixedly connected to one side of the connecting strip (42) in a straight line, and the other end of the first piston rod (43) is sealed and slidably inserted into the auxiliary air passage of the side plate (41).

5. A fluid pressure vessel according to claim 4, characterized in that: The linkage mechanism (5) includes a cylinder (51), a second piston rod (52) and an air pipe (53). The cylinder (51) is fixedly installed on the end face of the side plate (41), the second piston rod (52) is slidably installed in the cylinder (51), and the air pipe (53) is connected to the lower end of the cylinder (51).

6. A fluid pressure vessel according to claim 5, characterized in that: The cylinder (51) has a main chamber and two auxiliary chambers inside. The two auxiliary chambers are connected to the upper end of the main chamber. The second piston rod (52) includes a connecting plate and two rods. The connecting plate is slidably installed in the main chamber, and the two rods are respectively sealed and slidably installed in the two auxiliary chambers. The cylinder (51) is connected to the can cover (12) and the side plate (41) through two pipes respectively. One of the auxiliary chambers is connected to the inside of the main body (1) through a pipe, and the other auxiliary chamber is connected to the inside of the side plate (41) through a pipe.

7. A fluid pressure vessel according to claim 6, characterized in that: The cylinder (51) is equipped with a triggering mechanism (6) that applies a thrust to the second piston rod (52).

8. A fluid pressure vessel according to claim 7, characterized in that: The triggering mechanism (6) includes a spring (61), a lead screw (62), and a sliding block (63). The spring (61) is installed in the cylinder (51) to apply an upward elastic force to the second piston rod (52). The lead screw (62) is rotatably installed in the cylinder (51), and the spring (61) is sleeved on the lead screw (62). The sliding block (63) is slidably installed in the cylinder (51), and the sliding block (63) is threadedly connected to the lead screw (62). The lower end of the spring (61) is fixedly connected to the upper end of the sliding block (63).

9. A fluid pressure vessel according to claim 8, characterized in that: The lower end of the second piston rod (52) is provided with a sliding hole that matches the lead screw (62), and the lower end of the lead screw (62) is connected to a driving component for driving the lead screw (62) to rotate.

10. A bottom-sealed side-opening structure, applicable to any fluid pressure vessel as described in claims 1 to 9, characterized in that: Includes a sealing ring (21), an annular groove is opened at the lower end of the pipe (2), the sealing ring (21) is fixedly sleeved in the annular groove, and a nut (22) is threadedly connected to the outer wall of the pipe (2), the nut (22) is used to fix the pipe (2) to the can cover (12).

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