A low-temperature liquid storage tank pressure relief noise reduction cylinder

Abstract

The utility model discloses a low temperature liquid storage tank pressure relief noise reduction cylinder, including the connection of the pressure relief valve tail end pressure relief mouth with low temperature liquid storage tank's link tube, the tail end of link tube is connected with the pressure relief tail pipe through the bend, be located the inside setting of link tube has the noise reduction piece for absorbing noise, the noise reduction piece is used for absorbing the noise of pressure relief valve tail end pressure relief mouth, the bend and pressure relief tail pipe realize step -by -step pressure reduction and supplementary noise reduction through the change flow channel, the utility model discloses through setting the noise reduction piece (such as filling the cavity of polyurethane foaming material) in the inside of link tube, and setting the spiral guide vane in the inside of pressure relief tail pipe, can effectively absorb high frequency noise and weaken low frequency vibration. Meanwhile, the design of the curved bend pipe changes the medium flow direction, further reduces the impact noise of high -speed airflow. Comprehensive these measures, the working environment noise level can be reduced to 75dB significantly, and is reduced by 15% 20% compared with the traditional device.

Description

Technical Field

[0001] This utility model relates to a pressure relief and noise reduction cylinder for cryogenic liquid storage tanks. Background Technology

[0002] Cryogenic liquid storage tanks are widely used in industrial and scientific research fields, primarily for storing liquefied gases such as liquid nitrogen, liquid oxygen, and liquid argon. During operation, especially during pressure relief, these tanks generate significant noise, adversely affecting the surrounding environment and operators. Furthermore, traditional pressure relief devices may result in substantial liquid loss during depressurization, impacting the tank's efficiency and safety.

[0003] The existing technical solutions mainly include the following: Traditional pressure relief valves primarily function to automatically open when the pressure exceeds a set value, releasing excess pressure to protect the storage tank and system. However, traditional pressure relief valves generate significant noise during the pressure relief process, and the released gas is directly discharged into the atmosphere, causing energy loss and environmental pollution.

[0004] Silencers: Installed after the pressure relief valve, they are used to reduce noise during gas discharge. While silencers can effectively reduce noise, they do not reduce energy loss during the pressure relief process and increase system complexity and cost. Utility Model Content

[0005] The purpose of this invention is to provide a pressure relief and noise reduction cylinder for cryogenic liquid storage tanks, so as to solve the problem mentioned in the background art that cryogenic liquid storage tanks generate a lot of noise when depressurizing.

[0006] To solve the above technical problems, this utility model provides the following technical solution: a pressure relief and noise reduction cylinder for a cryogenic liquid storage tank, comprising a connecting cylinder connected to the pressure relief port at the tail end of the pressure relief valve at the cryogenic liquid storage tank, wherein the tail end of the connecting cylinder is connected to the pressure discharge tail pipe through a bend. A noise reduction component is provided inside the connecting cylinder for absorbing noise. The noise reduction component is used to absorb the noise from the pressure relief port at the tail end of the pressure relief valve. The bend and pressure relief tailpipe achieve step-by-step pressure reduction and noise reduction by changing the flow path.

[0007] Preferably, the noise reduction component includes a cavity formed at the connecting cylinder wall, and a noise reduction layer is filled inside the cavity. The noise reduction layer includes polyurethane foam material, which is used to absorb high-frequency noise and provide thermal insulation.

[0008] Preferably, the bend is arranged in a curved arc shape to change the direction of medium flow.

[0009] Preferably, the tail end of the pressure relief pipe is provided with a converging part, the diameter of which gradually decreases from right to left. During the production and filling of liquefied medium, continuous pressure relief is required. If the exhaust port diameter is too large, the pressure difference and temperature difference between atmospheric pressure and the internal pressure of the storage tank will be too large, resulting in an increase in the amount of low-temperature gas vaporization and more gaseous substances that need to be discharged. By reducing the diameter, the utilization rate of liquid in the storage tank can be improved.

[0010] Preferably, the pressure relief tailpipe is internally equipped with spiral guide vanes, with four sets of spiral guide vanes. Through multi-stage pressure reduction design (bends and spiral guide vanes), the medium flow rate can be effectively controlled, reducing pressure fluctuations. Furthermore, reducing the evaporation of the liquid medium also reduces sudden increases in internal pressure of the storage tank, thereby improving the safety and stability of the system.

[0011] Preferably, the outer periphery of the connecting cylinder is provided with four sets of mounting holes, and connecting bolts are provided inside the mounting holes so that the connecting bolts pass through the mounting holes to connect the connecting cylinder to the tail end of the pressure relief valve at the cryogenic liquid storage tank.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This invention effectively absorbs high-frequency noise and weakens low-frequency vibrations by incorporating noise-reducing components (such as a cavity filled with polyurethane foam) inside the connecting cylinder and spiral guide vanes inside the pressure discharge tailpipe. Simultaneously, the curved pipe design further reduces the impact noise of high-speed airflow by altering the direction of medium flow. Combined with these measures, the ambient noise level can be significantly reduced to 75 dB, a 15%-20% reduction compared to traditional devices.

[0013] Meanwhile, a converging section is installed at the end of the pressure relief pipe to reduce the diameter of the exhaust port, thereby reducing the evaporation of the liquid medium. This effectively improves the utilization rate of the liquid in the storage tank, reduces liquid loss due to pressure relief, and thus lowers operating costs.

[0014] The polyurethane foam material inside the cavity not only reduces noise but also provides thermal insulation, effectively preventing excessive ice buildup on the surface. This significantly improves the device's adaptability and reliability in low-temperature environments and extends its service life.

[0015] The installation method is simple and quick, achieved by setting four sets of mounting holes on the outer circumference of the connecting sleeve and fixing it to the tail end of the pressure relief valve of the cryogenic liquid storage tank with connecting bolts. Simply connect the mounting port to the outlet of the pressure relief valve and tighten the screw with a wrench; the tightening force ensures a safe and reliable connection. This significantly reduces installation difficulty and cost, and improves installation efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of an embodiment of the present utility model; Figure 2This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 3 This is a cross-sectional structural diagram of an embodiment of the present utility model; Figure 4 This is a schematic diagram of the pressure relief tailpipe structure according to an embodiment of the present utility model.

[0017] In the diagram: 1. Connecting cylinder; 11. Mounting hole; 12. Connecting bolt; 2. Bend; 3. Pressure discharge tailpipe; 31. Converging part; 32. Spiral guide vane; 4. Noise reduction component; 41. Clamping cavity; 42. Noise reduction layer. Detailed Implementation

[0018] To address the issue of significant noise generated during pressure relief in cryogenic liquid storage tanks, this invention provides a pressure relief and noise reduction cylinder for cryogenic liquid storage tanks. The technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] Please see Figure 1-4 This utility model provides a pressure relief and noise reduction cylinder for a cryogenic liquid storage tank, including a connecting cylinder 1 connected to the pressure relief port at the tail end of the pressure relief valve at the cryogenic liquid storage tank. The tail end of the connecting cylinder 1 is connected to the pressure discharge tail pipe 3 through a bend 2. A noise reduction component 4 for absorbing noise is provided inside the connecting cylinder 1. The noise reduction component 4 is used to absorb the noise from the pressure relief port at the tail end of the pressure relief valve. The noise reduction component 4 includes a cavity 41 opened in the wall of the connecting cylinder 1. The cavity 41 is filled with a noise reduction layer 42. The noise reduction layer 42 includes polyurethane foam material. The polyurethane foam material is used to absorb high-frequency noise and provide thermal insulation.

[0020] The bend 2 is arranged in a curved arc shape to change the direction of medium flow.

[0021] The tail end of the pressure discharge tailpipe 3 is provided with a converging part 31, the diameter of which gradually decreases from right to left. The interior of the pressure discharge tailpipe 3 is provided with a spiral guide vane 32, which has 4 sets of turns.

[0022] The bend 2 and the pressure relief tailpipe 3 achieve step-by-step pressure reduction and noise reduction by changing the flow channel.

[0023] The outer periphery of the connecting cylinder 1 is provided with four sets of mounting holes 11, and a connecting bolt 12 is provided inside the mounting holes 11 so that the connecting bolt 12 passes through the mounting holes 11 to connect the connecting cylinder 1 to the tail end of the pressure relief valve at the cryogenic liquid storage tank.

[0024] The working principle of the pressure relief and noise reduction cylinder for a cryogenic liquid storage tank provided by this utility model is as follows: When the pressure inside the cryogenic liquid storage tank exceeds the set safety threshold, the pressure relief process begins when the operator manually opens the pressure relief valve.

[0025] Cryogenic liquids such as liquid nitrogen, liquid oxygen, liquid argon, or their vaporized gases are introduced into connecting cylinder 1 through a pressure relief valve.

[0026] The noise reduction component 4 inside the connecting cylinder 1 effectively absorbs some high-frequency noise through the porous structure inside the polyurethane foam material.

[0027] The medium then enters bend 2, whose curved design alters the flow direction of the medium. This change reduces the flow velocity of the medium and disperses the energy of pressure fluctuations, thereby initially reducing noise and achieving the first stage of pressure reduction.

[0028] After initial pressure reduction through bend 2, the medium enters the pressure relief tailpipe 3. The pressure relief tailpipe 3 is equipped with spiral guide vanes 32, which extend the propagation path of the medium through a spiral channel.

[0029] Guided by the spiral guide vane 32, the medium flows along a spiral path, changing its flow direction multiple times. This process further consumes the kinetic energy of the medium, causing the sound wave energy to gradually attenuate during propagation, thereby effectively reducing low-frequency noise, such as the typical frequency range of 300-800Hz during liquid nitrogen depressurization.

[0030] Meanwhile, the noise reduction component 4 inside the connecting cylinder 1 continues to function. The polyurethane foam material in the noise reduction component 4 absorbs high-frequency noise of 200-1000Hz and prevents excessive ice buildup on the surface through thermal insulation, further reducing noise propagation.

[0031] Through the combined effects of the spiral flow guide and sound-absorbing materials, the noise level in the working environment is significantly reduced, from above 90dB in traditional devices to below 75dB, a reduction of 15%-20%.

[0032] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief and noise reduction cylinder for a cryogenic liquid storage tank, characterized in that: Includes a connecting cylinder (1) connected to the pressure relief port at the tail end of the pressure relief valve at the cryogenic liquid storage tank, the tail end of the connecting cylinder (1) being connected to the pressure relief tail pipe (3) via a bend (2); A noise reduction component (4) for absorbing noise is provided inside the connecting cylinder (1). The noise reduction component (4) is used to absorb the noise from the pressure relief port at the tail end of the pressure relief valve. The bend (2) and the pressure relief tailpipe (3) reduce pressure step by step and assist in noise reduction by changing the flow channel.

2. The cryogenic liquid storage tank pressure relief and noise reduction cylinder according to claim 1, characterized in that: The noise reduction component (4) includes a cavity (41) opened in the wall of the connecting cylinder (1), and a noise reduction layer (42) is filled inside the cavity (41). The noise reduction layer (42) includes polyurethane foam material, which is used to absorb high-frequency noise and provide thermal insulation.

3. The cryogenic liquid storage tank pressure relief and noise reduction cylinder according to claim 2, characterized in that: The bend (2) is arranged in a curved arc shape so that the bend (2) changes the direction of medium flow.

4. The cryogenic liquid storage tank pressure relief and noise reduction cylinder according to claim 3, characterized in that: The tail end of the pressure discharge tail pipe (3) is provided with a converging part (31), and the diameter of the converging part (31) gradually decreases from right to left.

5. The cryogenic liquid storage tank pressure relief and noise reduction cylinder according to claim 4, characterized in that: The pressure relief tailpipe (3) is provided with a spiral guide vane (32) inside, and the spiral guide vane (32) has 4 sets of turns.

6. The cryogenic liquid storage tank pressure relief and noise reduction cylinder according to claim 5, characterized in that: The outer periphery of the connecting cylinder (1) is provided with four sets of mounting holes (11), and a connecting bolt (12) is provided inside the mounting hole (11) so that the connecting bolt (12) passes through the mounting hole (11) to connect the connecting cylinder (1) to the tail end of the pressure relief valve at the cryogenic liquid storage tank.

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