A low-temperature liquid tank air pressure adjusting device
By designing a pressure regulating device that includes a cavity, connecting sleeve, valve body and control mechanism, the problem of automatic pressure relief and resealing of cryogenic liquid storage tanks when the pressure is too high is solved, realizing flexible pressure relief control and improved safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING SENLI ENERGY EQUIPMENT CO LTD
- Filing Date
- 2025-09-30
- Publication Date
- 2026-07-24
AI Technical Summary
Existing cryogenic liquid storage tanks lack an automatic pressure relief mechanism when the pressure is too high, which makes it impossible to release the excessive pressure in time, posing a safety hazard. Furthermore, the seal cannot be reset after pressure relief, resulting in insufficient flexibility and safety of the device.
A pneumatic pressure regulating device is designed, comprising a cavity, a connecting sleeve, a valve body, and a regulating mechanism. Through the cooperation of a conical cavity core, a damping rod, a pressure spring, and an adjusting component, it achieves automatic pressure relief, resetting of the seal, and flexible setting of the pressure relief start pressure. The gas flow is controlled by a rotating adjusting wheel and a lifting rod, and a buffer spring prevents rigid collisions.
It enables automatic pressure relief and resealing of cryogenic liquid storage tanks when the pressure is too high, ensuring safety. It also allows for flexible setting of the pressure relief start pressure to avoid component damage, thus improving the safety and practicality of the device.
Smart Images
Figure CN224550875U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of regulating equipment technology, and in particular to a pressure regulating device for cryogenic liquid storage tanks. Background Technology
[0002] Cryogenic liquid storage tanks are widely used in chemical, energy, and medical fields to store cryogenic liquids such as liquid oxygen, liquid nitrogen, liquid hydrogen, and liquefied natural gas (LNG). These cryogenic liquids vaporize rapidly at normal temperature and pressure, therefore they need to be stored in a low-temperature, high-pressure environment to maintain their liquid state. Because the insulation material is not completely heat-insulating, external heat can enter the tank, causing partial reheating and vaporization of the cryogenic liquid, resulting in a continuous increase in pressure inside the tank. If the pressure becomes too high and is not released in time, it may lead to serious safety accidents such as tank explosions, posing a significant threat to personnel and equipment.
[0003] Existing technology patent document CN216158529U discloses an easy-to-install cryogenic liquid storage tank pressure regulating device, belonging to the technical field of pressure regulating equipment. It includes a regulating valve with connecting pipes on both sides. The left end of each connecting pipe is fixedly connected to the right end of a connecting sleeve. Fixing holes are provided on the upper and lower surfaces of the inner wall of the connecting sleeve. Limiting blocks are fixedly connected to both the upper and lower surfaces of the inner wall of the connecting sleeve. The surface of each limiting block has a first limiting groove and a second limiting groove. This easy-to-install cryogenic liquid storage tank pressure regulating device, by incorporating a toothed column, teeth, a first movable groove, and a first extrusion plate, allows for easy installation. During use, the pipe to be connected is placed between two airtight gaskets. Only periodic replacement of the airtight gaskets within the first and second extrusion plates is required, preventing leakage of liquid from the tank over prolonged use and increasing the device's practicality.
[0004] While existing pressure regulating devices are easy to install, they lack an automatic pressure relief mechanism when the pressure inside the storage tank exceeds the safety threshold. This can lead to safety accidents such as deformation or even rupture of the storage tank due to excessive pressure, making them unsuitable for meeting people's needs and having low practicality. Utility Model Content
[0005] The purpose of this utility model is to provide a pressure regulating device for cryogenic liquid storage tanks, which solves the problems of the inability to automatically release pressure when the equipment pressure is too high, the inability to reset the seal after pressure release, and the inability to flexibly set the pressure release start pressure.
[0006] To achieve the above objectives, this utility model provides a pressure regulating device for a cryogenic liquid storage tank, comprising a cavity, a connecting sleeve fixedly connected to the outside of the cavity, a connector threaded to the other end of the connecting sleeve, a valve body fixedly connected to the other end of the connector, a release mechanism provided at the top of the cavity, and a regulating mechanism provided at the top of the valve body. The release mechanism includes a connecting flange, the bottom of which is threadedly connected to the top of the cavity, a protective shell fixedly connected to the top of the connecting flange, a support base fixedly connected inside the protective shell, a damping rod slidably connected inside the support base, a conical core fixedly connected to the bottom of the damping rod, a pressure spring sleeved inside the support base, a sliding rod fixedly connected to the top of the protective shell, and an adjusting component slidably connected to the outside of the sliding rod.
[0007] The control mechanism includes a top sealing ring, the bottom of which is threaded to the top of the valve body. A sealing seat is fixedly connected inside the top sealing ring, and a lifting rod is rotatably connected inside the sealing seat. A control seat is threaded to the bottom of the lifting rod, and a buffer spring is fixedly connected to the bottom inner side of the control seat. A sealing valve core is fixedly connected to the bottom of the buffer spring, and a tapered opening is fixedly connected to the side of the valve body near the connector.
[0008] The valve body has a support rod fixedly connected to its inner bottom side, and the lifting rod has a wheel fixedly connected to its top.
[0009] The sealing valve core is internally slidably connected to the top outer side of the support base rod, the buffer spring is internally sleeved on the top outer side of the support base rod, and the sealing valve core is externally supported on the outside of the conical opening.
[0010] The adjustment assembly includes a sliding plate, the outer inner side of which is slidably connected to the outside of the slide rod, and an adjustment seat is fixedly connected to the outer inner side of the sliding plate. An adjustment wheel is threadedly connected to the top of the adjustment seat.
[0011] The bottom of the adjusting wheel is rotatably connected to the top of the pressure spring, and the outside of the pressure spring is slidably connected to the inside of the protective shell.
[0012] The outer part of the conical cavity core is slidably connected to the inside of the cavity, and the inner part of the pressure spring is sleeved on the outside of the damping rod.
[0013] The cavity is fixedly connected to an adapter pipe on the outside of the cavity, i.e., the side away from the connecting sleeve, and the valve body is fixedly connected to an adapter on the outside of the valve body, i.e., the side away from the connector.
[0014] This utility model relates to a pressure regulating device for cryogenic liquid storage tanks.
[0015] 1. In this utility model, air pressure acts on the bottom of the cone core to drive the cone core to move upward along the damping rod, and the pressure spring structure drives the cone core to move downward and reset. The rotating adjustment wheel structure drives the slide plate to move along the slide rod to work, thereby achieving the effects of automatic pressure relief, resetting and sealing according to air pressure, and flexibly setting the pressure relief start pressure.
[0016] 2. In this utility model, the screw connection between the rotating wheel and the lifting rod causes the control seat to drive the sealing valve core to move up and down along the support rod. With the cooperation of the buffer spring and the support rod, the impact when the sealing valve core contacts the cone is buffered, thus solving the problems of uncontrollable gas flow and damage to components due to rigid collision. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0019] Figure 2 This is a structural schematic diagram of the connector of this utility model.
[0020] Figure 3 This is a schematic diagram of the protective shell of this utility model.
[0021] Figure 4 This is a schematic diagram of the valve body of this utility model.
[0022] In the diagram: 1. Cavity; 2. Connecting sleeve; 3. Connector; 4. Valve body; 5. Release mechanism; 51. Connecting flange; 52. Protective shell; 53. Support seat; 54. Damping rod; 55. Conical cavity core; 56. Pressure spring; 57. Slide rod; 58. Adjusting assembly; 581. Slide plate; 582. Adjusting seat; 583. Adjusting wheel; 6. Control mechanism; 61. Top sealing ring; 62. Sealing seat; 63. Rotary wheel; 64. Lifting rod; 65. Control seat; 66. Buffer spring; 67. Sealing valve core; 68. Conical opening; 69. Support base rod; 7. Adapter; 8. Adapter pipe. Detailed Implementation
[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.
[0024] Please see Figures 1-4This utility model provides a technical solution: a cryogenic liquid storage tank pressure regulating device, including a cavity 1, which is the core part of the entire device, responsible for bearing the pressure generated by the liquid and providing corresponding structural support. A connecting sleeve 2 is fixedly connected to the outside of the cavity 1, which connects the device to the connector 3, facilitating the transport of liquid and the release of gas. The other end of the connecting sleeve 2 is threadedly connected to the connector 3, which provides the connection. The other end of the connector 3 is fixedly connected to a valve body 4, which is a bearing component for regulating gas pressure and airflow, facilitating the control of the gas entering or releasing the cavity 1. A release mechanism 5 is provided on the top of the cavity 1, and a regulating mechanism 6 is provided on the top of the valve body 4.
[0025] The release mechanism 5 includes a connecting flange 51, which connects the top of the cavity 1 to the protective shell 52, providing a sealed connection. The bottom of the connecting flange 51 is threaded to the top of the cavity 1. The top of the connecting flange 51 is fixedly connected to the protective shell 52, which prevents external impurities from entering and provides guiding space for the movement of internal components. The inside of the protective shell 52 is fixedly connected to a support seat 53, which provides support and guidance for the up-and-down movement of the conical core 55 and restricts its movement trajectory. The inside of the support seat 53 is slidably connected to a damping rod 54, which guides the up-and-down movement of the conical core 55, provides movement trajectory constraints, and generates damping force through sliding cooperation with the support seat 53 to slow down the movement speed of the conical core 55. The bottom of the damping rod 54 is fixedly connected to the conical core 55, which controls the communication state of the cavity 1 through up-and-down movement. Its conical structure cooperates with the opening of the cavity 1 to achieve pressure-driven operation.
[0026] A pressure spring 56 is fitted inside the support base 53. The pressure spring 56 provides a restoring force so that the cone core 55 returns to its sealed position when the air pressure is lower than the set value. At the same time, the spring compression can be changed by adjusting the adjustment component 58, thereby adjusting the pressure relief start pressure. A slide rod 57 is fixedly connected to the top of the protective shell 52. The slide rod 57 provides a vertical sliding guide for the adjustment component 58. The adjustment component 58 is slidably connected to the outside of the slide rod 57. The outside of the cone core 55 is slidably connected to the inside of the cavity 1. The inside of the pressure spring 56 is fitted outside the damping rod 54.
[0027] The adjustment assembly 58 includes a sliding plate 581, which connects the adjustment seat 582 and the slide rod 57, allowing the adjustment seat 582 to slide up and down along the slide rod 57, providing a mounting carrier for the adjustment wheel 583. The outer inner side of the sliding plate 581 is slidably connected to the outside of the slide rod 57, and the adjustment seat 582 is fixedly connected to the outer inner side of the sliding plate 581. The adjustment seat 582 supports the adjustment wheel 583 and provides a threaded connection structure, so that the rotational motion of the adjustment wheel 583 can be converted into vertical displacement, thereby compressing or releasing the pressure spring 56. The top of the adjustment seat 582 is threadedly connected to the adjustment wheel 583, which moves up and down by rotating, thereby changing the compression of the pressure spring 56 and adjusting the pressure relief start pressure. The bottom of the adjustment wheel 583 is rotatably connected to the top of the pressure spring 56, and the outside of the pressure spring 56 is slidably connected to the inside of the protective shell 52.
[0028] like Figures 1-4 As shown, the control mechanism 6 includes a top sealing ring 61, which fixes a sealing seat 62 to provide an installation base for the lifting rod 64 and ensures the airtightness inside the valve body 4. The bottom of the top sealing ring 61 is threadedly connected to the top of the valve body 4. The sealing seat 62 is fixedly connected inside the top sealing ring 61. The sealing seat 62 supports and fixes the rotation center of the lifting rod 64, provides a rotation bearing for the lifting rod 64, and seals the gap between the lifting rod 64 and the top of the valve body 4 to prevent gas leakage. The lifting rod 64 is rotatably connected inside the sealing seat 62. The lifting rod 64 converts the rotational motion of the rotating wheel 63 into vertical displacement. The bottom of the lifting rod 64 is threadedly connected to a control seat 65. The control seat 65 transmits the displacement force of the lifting rod 64. A buffer spring 66 is fixedly connected to the inner bottom of the control seat 65. The buffer spring 66 buffers the impact force when the sealing valve core 67 contacts the cone 68, avoiding rigid collisions that could cause wear or deformation of the components. It also provides a certain elastic restoring force to make the seal more reliable.
[0029] A sealing valve core 67 is fixedly connected to the bottom of the buffer spring 66. The sealing valve core 67 opens and closes the gas passage by cooperating with the conical opening 68. Its lifting and lowering movement controls the gas flow. The surface sealing surface fits with the conical opening 68 to achieve a seal. A conical opening 68 is fixedly connected to the side of the valve body 4 near the connector 3. The conical opening 68 and the sealing valve core 67 form a sealed channel interface to provide gas flow. A support rod 69 is fixedly connected to the bottom inside the valve body 4. The support rod 69 supports the sealing valve core 67, provides guidance for its lifting and lowering movement, limits the radial displacement of the sealing valve core 67, ensures its alignment accuracy with the conical opening 68, and also serves as the mounting support for the buffer spring 66. A rotating wheel 63 is fixedly connected to the top of the lifting rod 64. The rotating wheel 63 drives the lifting rod 64 to rotate by rotating.
[0030] The sealing valve core 67 is internally slidably connected to the top outer side of the support base rod 69. The buffer spring 66 is internally sleeved on the top outer side of the support base rod 69. The sealing valve core 67 is externally supported on the outside of the cone 68. An adapter pipe 8 is fixedly connected to the outside of the cavity 1, i.e., the side away from the connecting sleeve 2. The adapter pipe 8 expands the medium transmission path of the cavity 1, facilitating liquid replenishment or gas recovery and providing additional interface options. An adapter 7 is fixedly connected to the outside of the valve body 4, i.e., the side away from the connector 3. The adapter 7 connects the valve body 4 to the external gas pipeline.
[0031] Working principle: When the cryogenic liquid evaporates in the storage tank, causing the gas pressure to rise, the gas pressure is transmitted to the inside of the cavity 1 through the transfer pipe 8. When passing the bottom of the conical core 55, it is subjected to gas pressure. When the gas pressure is greater than the elastic force of the pressure spring 56, it pushes the conical core 55 to move upward along the damping rod 54, so that a gap is created at the bottom of the cavity 1, and the gas is discharged to relieve pressure. After the gas pressure drops, the pressure spring 56 resets the conical core 55 to seal the cavity 1. In the adjustment assembly 58, the rotating adjustment wheel 583 drives the slide plate 581 to move along the slide rod 57 through the threaded transmission of the adjustment seat 582, changing the compression of the pressure spring 56, thereby setting the pressure relief start pressure. The damping rod 54 and the support seat 53 cooperate to generate damping, slowing down the movement speed of the conical core 55. The connecting flange 51 and the protective shell 52 ensure the sealing and protection of the mechanism.
[0032] In the control mechanism 6, the rotating wheel 63 drives the lifting rod 64 to rotate within the sealing seat 62, and through the threaded transmission, the control seat 65 moves up and down, driving the sealing valve core 67 to rise and fall along the supporting bottom rod 69, engaging or separating from the cone 68 to control the gas flow. The buffer spring 66 buffers the impact between the sealing valve core 67 and the cone 68. The connecting sleeve 2 and the connecting head 3 are threadedly connected to form a medium channel. The valve body 4 cooperates with the sealing valve core 67 through the cone 68 to perform air pressure regulation and locking. The adapter pipe 8 and the adapter 7 are respectively connected to the external pipelines of the cavity 1 and the valve body 4 to expand the medium transmission path and realize gas input and output control.
[0033] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.
Claims
1. A pressure regulating device for a cryogenic liquid storage tank, comprising a cavity, characterized in that: A connecting sleeve is fixedly connected to the outside of the cavity. A connector is threaded to the other end of the connecting sleeve. A valve body is fixedly connected to the other end of the connector. A release mechanism is provided at the top of the cavity. A control mechanism is provided at the top of the valve body. The release mechanism includes a connecting flange, the bottom of which is threaded to the top of the cavity. A protective shell is fixedly connected to the top of the connecting flange. A support base is fixedly connected inside the protective shell. A damping rod is slidably connected inside the support base. A conical core is fixedly connected to the bottom of the damping rod. A pressure spring is sleeved inside the support base. A slide rod is fixedly connected to the top of the protective shell. An adjustment component is slidably connected to the outside of the slide rod.
2. The pressure regulating device for a cryogenic liquid storage tank according to claim 1, characterized in that: The control mechanism includes a top sealing ring, the bottom of which is threadedly connected to the top of the valve body. A sealing seat is fixedly connected inside the top sealing ring, and a lifting rod is rotatably connected inside the sealing seat. A control seat is threadedly connected to the bottom of the lifting rod, and a buffer spring is fixedly connected to the bottom inner side of the control seat. A sealing valve core is fixedly connected to the bottom of the buffer spring, and a tapered opening is fixedly connected to the side of the valve body near the connector.
3. The pressure regulating device for a cryogenic liquid storage tank according to claim 2, characterized in that: A support rod is fixedly connected to the bottom inside the valve body, and a wheel is fixedly connected to the top of the lifting rod.
4. The pressure regulating device for a cryogenic liquid storage tank according to claim 3, characterized in that: The sealing valve core is internally slidably connected to the top outer side of the support base rod, the buffer spring is internally sleeved on the top outer side of the support base rod, and the sealing valve core is externally supported on the outside of the cone opening.
5. The pressure regulating device for a cryogenic liquid storage tank according to claim 1, characterized in that: The adjustment assembly includes a slide plate, the outer inner side of which is slidably connected to the outside of the slide rod, and an adjustment seat is fixedly connected to the outer inner side of the slide plate. An adjustment wheel is threadedly connected to the top of the adjustment seat.
6. The pressure regulating device for a cryogenic liquid storage tank according to claim 5, characterized in that: The bottom of the adjusting wheel is rotatably connected to the top of the pressure spring, and the outside of the pressure spring is slidably connected to the inside of the protective shell.
7. The pressure regulating device for a cryogenic liquid storage tank according to claim 1, characterized in that: The outer part of the conical cavity core is slidably connected to the inside of the cavity, and the inner part of the pressure spring is sleeved on the outside of the damping rod.
8. The pressure regulating device for a cryogenic liquid storage tank according to claim 1, characterized in that: An adapter pipe is fixedly connected to the outside of the cavity, i.e., the side away from the connecting sleeve, and an adapter is fixedly connected to the outside of the valve body, i.e., the side away from the connecting head.