Liquefied natural gas (LNG) storage tank liquid turning device

Abstract

The utility model discloses a liquid turning device of an LNG (Liquefied Natural Gas) storage tank. The liquid turning device comprises the storage tank, a pressure sensor, an upper temperature sensor, a lower temperature sensor and a liquid turning mechanism, through the arrangement of the liquid turning mechanism, upper and lower layers of liquid in the storage tank can be conveniently, quickly and greatly mixed, so that the uniformity and consistency of the temperature of the liquid in the storage tank are accelerated, liquid layering is avoided, and safe storage of liquid natural gas in the storage tank is realized; the liquid turning piece can greatly drive lower-layer liquid to move upwards and upper-layer liquid to move downwards in the up-down moving process, rapid mixing of the upper-layer liquid and the lower-layer liquid is achieved, efficient mixing performance is embodied, flexible deformation and rapid mixing of the upper-layer liquid and the lower-layer liquid are achieved through the liquid turning piece, the temperature is consistent, and the rolling phenomenon caused by layering is avoided; through the arrangement of the flexible wrapping belt, the flexible wrapping belt deforms under the influence of water and the acting force of upward movement and downward movement in the up-down movement process, and the consistency and uniformity of the temperature of liquid in the storage tank can be rapidly achieved.

Description

Technical Field

[0001] The utility model relates to relevant fields, in particular to a liquid turning device for an LNG storage tank. Background Art

[0002] LNG storage tank types are classified by capacity, and are divided into small, medium, large, large storage tanks and extra-large storage tanks, which are used in different occasions. According to the insulation classification, they are divided into vacuum powder insulation, positive pressure stacking insulation and high vacuum multi-layer insulation, which are suitable for tanks and storage tanks of different capacities respectively. According to the shape of the tank, they are divided into spherical tanks and cylindrical tanks. Spherical tanks are generally used for small and medium-sized storage tanks, and cylindrical tanks are widely used for storage tanks of various capacities.

[0003] The Chinese patent with patent number CN201320230562.6 discloses the "LNG tank liquid turning device". Through the air-driving of the magnetic block, the liquid turning plate moves up and down, and the LNG with lower temperature in the lower layer moves upward to absorb the gasified BOG gas to achieve the effect of reducing pressure. In addition, this structure promotes the uniform distribution of LNG temperature in the LNG tank, and effectively prevents the rolling caused by the stratification of LNG in the LNG tank. The device is simple, energy-saving and efficient.

[0004] This structure has certain advantages, but still has some shortcomings:

[0005] In this structure, the liquid turning plate is in an arc shape. During the upward movement, it is convenient to bring the lower layer of liquid upward, absorb the vaporized BOG gas, and mix it with the upper layer of liquid to reduce the temperature and prevent rolling caused by stratification. However, during the downward movement of the liquid turning plate, its arc is at the upper part, resulting in that when it moves downward, it cannot bring the upper layer of liquid downward, so as to mix it with the lower layer of low-temperature liquid, so that it takes a long time to achieve the purpose of balanced temperature distribution in the storage tank, which is not conducive to rapid mixing of temperature to achieve the purpose of uniform temperature. Utility Model Content

[0006] Therefore, in order to solve the above-mentioned shortcomings, the utility model provides a LNG storage tank liquid turning device.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an LNG tank liquid turning device, including a storage tank, a pressure sensor, an upper temperature sensor, a lower temperature sensor, and a liquid turning mechanism, wherein a pressure sensor is installed at the top of the storage tank, and the upper temperature sensor and the lower temperature sensor are respectively installed at the upper and lower ends of the left side of the storage tank, and the liquid turning mechanism is installed in the middle of the storage tank, and the liquid turning mechanism includes a base, a motor, a screw rod, a slide seat, a magnetic block, a guide seat, a liquid turning part, and a driven magnetic block. The base is installed on the outside of the storage tank, and a motor is installed on the top of the base. The bottom end of the motor is connected to the screw rod by a coupling, and the bottom end of the screw rod is movably connected to the base. The inner side of the slide seat is threadedly connected to the screw rod, and a magnetic block is fixed to its left end. The right end of the guide seat is fixed to the storage tank, and a liquid turning part is slidably connected inside it, and a driven magnetic block is fixed to the right end of the liquid turning part, and the driven magnetic block is magnetically connected to the magnetic block.

[0008] Preferably, the liquid-turning part includes a movable connecting seat, an upper base plate, a lower base plate, a flexible wrapping belt, and a mounting ring. A driven magnetic block is fixed to the left end of the movable connecting seat, and a mounting ring is fixed to the left end of the flexible wrapping belt, and the upper and lower ends thereof are respectively in contact with the upper base plate and the lower base plate. The upper base plate is locked and fixed to the lower base plate by bolts, and the upper base plate and the lower base plate are respectively fixed to the movable connecting seat with bolts.

[0009] It is further preferred that the liquid turning mechanism is provided with two groups, which are symmetrically distributed front and back with the dot of the storage tank as the symmetry point, and the liquid in the storage tank is quickly mixed through the opposite movements of the liquid turning parts in the two groups of liquid turning mechanisms, so that the temperatures of the upper and lower layers are quickly mixed to be consistent, thereby balancing the temperature in the storage tank and preventing liquid tumbling caused by stratification.

[0010] It is further preferred that the size of the upper base plate is consistent with that of the lower base plate, and grooves are provided on the inner sides thereof to facilitate fixing of the flexible wrapping belt, and the grooves are used for placing the flexible wrapping belt, so that the flexible wrapping belt is aligned with the grooves and placed, thereby aligning the mounting ring on the flexible wrapping belt with the bolts connecting the upper base plate and the lower base plate, so that the bolts can pass through the mounting ring.

[0011] It is further preferred that bolts penetrate the interior of the mounting ring, so as to facilitate synchronous fixing of the flexible wrapping belt during the locking process of the upper base plate and the lower base plate, thereby achieving convenient installation.

[0012] In a further preferred embodiment, a rectangular groove is provided inside the guide seat, and a movable connecting seat is slidably connected in the rectangular groove to facilitate the vertical movement of the movable connecting seat.

[0013] It is further preferred that the cross-section of the flexible wrapping belt is arc-shaped, and the flexible wrapping belt is flexible and easy to deform, so that in the process of the flexible wrapping belt moving up and down, it is affected by the liquid and the wrapping direction of the flexible wrapping belt is reversed, so that the upper layer of liquid is brought to the lower layer, and the lower layer of liquid is brought to the upper layer, so as to achieve a substantial mixing of the upper and lower layers of liquid, thereby increasing the mixing speed.

[0014] It is further preferred that the magnetic block and the driven magnetic block are both neodymium iron boron magnets with strong magnetism, so that when the magnetic block moves, the driven magnetic block can be driven to move synchronously through the air, thereby driving the flexible wrapping belt to move up and down.

[0015] It is further preferred that the flexible wrapping belt is a corrosion-resistant flexible material, which may be a common material for natural gas hoses, such as PVC soft material or high-density polyethylene material.

[0016] Beneficial effects of the utility model:

[0017] The utility model is provided with a liquid turning mechanism, which is convenient for quickly and significantly mixing the upper and lower layers of liquid in the storage tank, thereby accelerating the uniformity and consistency of the temperature of the liquid in the storage tank, thereby avoiding liquid stratification, and further avoiding the situation of liquid tumbling caused by stratification, and realizing safe storage of liquid natural gas in the storage tank. The liquid turning part can significantly drive the lower layer of liquid to move upward and the upper layer of liquid to move downward during the process of moving up and down, thereby realizing rapid mixing of the upper and lower layers of liquid, reflecting efficient mixing performance and strong practicality.

[0018] The utility model realizes flexible deformation by arranging a liquid turning part, quickly mixes the upper and lower layers of liquid, achieves temperature consistency, and avoids tumbling caused by stratification. Through the arrangement of the flexible wrapping belt, the flexible wrapping belt is deformed in the process of moving up and down under the influence of water and the upward and downward forces. When the flexible wrapping belt moves upward, the opening faces upward and supports the lower layer of liquid upward to mix with the upper layer of liquid. When it moves downward, the opening faces downward and supports the upper layer of liquid downward to mix with the lower layer of liquid. The mixing range is large and the efficiency is high, and the consistency and uniformity of the liquid temperature in the storage tank can be quickly achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a three-dimensional structural diagram of the liquid turning mechanism of the utility model;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the liquid turning mechanism of the utility model;

[0022] Figure 4 This is a detailed enlarged structural diagram of the liquid turning mechanism of the utility model;

[0023] Figure 5 This is a schematic diagram of the three-dimensional structure of the liquid turning part of the utility model;

[0024] Figure 6 It is a schematic diagram of the cross-sectional structure of the liquid turning part of the utility model.

[0025] Among them: storage tank-1, pressure sensor-2, upper temperature sensor-3, lower temperature sensor-4, liquid turning mechanism-5, base-51, motor-52, screw-53, slide-54, magnetic block-55, guide seat-56, liquid turning part-57, driven magnetic block-58, movable connecting seat-571, upper base plate-572, lower base plate-573, flexible wrapping belt-574, mounting ring-575. DETAILED DESCRIPTION

[0026] In order to further explain the technical solution of the present utility model, it is described in detail through specific embodiments below.

[0027] See also Figure 1 The utility model provides an LNG tank liquid turning device, including a storage tank 1, a pressure sensor 2, an upper temperature sensor 3, and a lower temperature sensor 4. The pressure sensor 2 is installed on the top of the storage tank 1, and the upper temperature sensor 3 and the lower temperature sensor 4 are installed at the upper and lower ends of the left side of the storage tank 1 respectively.

[0028] See also Figure 2-4 The utility model provides a liquid turning device for an LNG storage tank. The liquid turning mechanism 5 is installed in the middle of the storage tank 1. The liquid turning mechanism 5 includes a base 51, a motor 52, a screw rod 53, a slide seat 54, a magnet 55, a guide seat 56, a liquid turning piece 57, and a driven magnet 58. The base 51 is installed on the outside of the storage tank 1, and the motor 52 is installed on the top of the base 51. The bottom end of the motor 52 is connected to the screw rod 53 by a coupling. The bottom end of the screw rod 53 is movably connected to the base 51. The inner side of the slide seat 54 is threadedly connected to the screw rod 53, and the left end thereof is fixed with a magnet 55. The right end of the guide seat 56 is fixed to the storage tank 1, and the liquid turning piece 57 is slidably connected therein. The right end of the liquid turning piece 57 is fixed with a driven magnet 58, and the driven magnet 58 is magnetically connected to the magnet 55.

[0029] In this embodiment, two groups of liquid turning mechanisms 5 are provided, which are symmetrically distributed front to back with the dot of the storage tank 1 as the symmetry point. Through the opposite movements of the liquid turning parts 57 in the two groups of liquid turning mechanisms 5, the liquid in the storage tank 1 is quickly mixed, and the temperatures of the upper and lower layers are quickly mixed to be consistent, so that the temperature in the storage tank 1 is balanced and the liquid rolling caused by stratification is prevented. The setting of the liquid turning mechanism 5 realizes rapid temperature mixing. A rectangular groove is opened inside the guide seat 56, and a movable connecting seat 571 is slidably connected in the rectangular groove to facilitate the vertical movement of the movable connecting seat 571.

[0030] The multiple motors 52 can be operated synchronously by a synchronous motor control method or an encoder feedback control method.

[0031] See also Figure 5-6 The utility model provides a liquid turning device for an LNG storage tank. The liquid turning part 57 includes a movable connecting seat 571, an upper base plate 572, a lower base plate 573, a flexible wrapping belt 574, and a mounting ring 575. A driven magnetic block 58 is fixed to the left end of the movable connecting seat 571, and a mounting ring 575 is fixed to the left end of the flexible wrapping belt 574, and the upper and lower ends thereof are respectively in contact with the upper base plate 572 and the lower base plate 573. The upper base plate 572 is locked and fixed to the lower base plate 573 by bolts, and the upper base plate 572 and the lower base plate 573 are respectively fixed to the movable connecting seat 571 with bolts.

[0032] In this embodiment, the size of the upper base plate 572 is consistent with that of the lower base plate 573, and grooves are provided on the inner sides thereof, which is convenient for fixing the flexible wrapping belt 574. The grooves are used for placing the flexible wrapping belt 574, so that the flexible wrapping belt 574 is aligned with the grooves and placed, so that the mounting ring 575 on the flexible wrapping belt 574 is aligned with the bolts connecting the upper base plate 572 and the lower base plate 573, so that the bolts pass through the mounting ring 575. Bolts pass through the interior of the mounting ring 575, so that during the locking process of the upper base plate 572 and the lower base plate 573, the flexible wrapping belt 574 can be fixed synchronously to achieve convenient installation. The cross-section of the flexible wrapping belt 574 is arc-shaped, so that during the up and down movement of the flexible wrapping belt 574, under the influence of the liquid, the wrapping direction of the flexible wrapping belt 574 is reversed, so that the upper layer of liquid is brought to the lower layer, and the lower layer of liquid is brought to the upper layer, so as to achieve a large-scale mixing of the upper and lower layers of liquid, thereby increasing the mixing speed.

[0033] In this embodiment, when the flexible wrapping belt 574 is replaced, the connecting bolts of the upper base plate 572 and the lower base plate 573 are released so that there are no bolts passing through the mounting ring 575. The flexible wrapping belt 574 can then be taken out and replaced, which is very convenient.

[0034] See also Figure 1-Figure 6 When in use, when the pressure sensor 2 detects that the pressure in the storage tank 1 exceeds a preset value or the temperature difference between the upper temperature sensor 3 and the lower temperature sensor 4 exceeds a preset value, the external controller controls the start of the motor 52 to drive the screw rod 53 to rotate, causing the slide 54 and the magnet 55 to move up and down, and under the magnetic effect of the magnet 55 and the driven magnet 58, the driven magnet 58 moves synchronously with the magnet 55, and drives the liquid turning part 57 to move synchronously, so that the liquid turning part 57 slides in the guide seat 56;

[0035] When the liquid turning part 57 moves upward, the flexible wrapping belt 574 is affected by the force of water and the upward force, and its opening is upward, and the whole is in an arc shape with the opening upward, wrapping the lower layer of liquid and bringing it to the upper layer, so that the lower layer of low-temperature liquid absorbs the vaporized BOG gas, reduces the air pressure in the storage tank 1, and mixes with the upper layer of liquid to achieve temperature mixing. When the liquid turning part 57 moves downward, the flexible wrapping belt 574 is affected by the force of water and the downward force, and its opening is downward, and the whole is in an arc shape with the opening downward, wrapping the upper layer of liquid and bringing it to the lower layer, achieving the purpose of large-scale mixing of the upper and lower layers of liquid, thereby quickly making the temperature in the storage tank 1 consistent, eliminating the stratification phenomenon, and stopping the tumbling of the liquid until the pressure sensor 2 detects that the pressure is normal or the temperature difference between the upper temperature sensor 3 and the lower temperature sensor 4 is within the equipment range, then the liquid turning part 57 can be stopped from moving up and down.

[0036] The control method of the present invention is to control by manually starting and closing the switch. The wiring diagram of the power element and the provision of power supply are common knowledge in the field, and the present invention is mainly used to protect mechanical devices, so the present invention will not explain the control method and wiring arrangement in detail.

[0037] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0038] The above are only preferred examples of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An LNG storage tank liquid turning device, comprising a storage tank (1), a pressure sensor (2), an upper temperature sensor (3), and a lower temperature sensor (4), wherein the pressure sensor (2) is installed at the top of the storage tank (1), and the upper temperature sensor (3) and the lower temperature sensor (4) are installed at the upper and lower ends of the left side of the storage tank (1) respectively; Features: The invention also comprises a liquid turning mechanism (5), the liquid turning mechanism (5) being installed at the middle part of the storage tank (1), the liquid turning mechanism (5) comprising a base body (51), a motor (52), a screw rod (53), a slide seat (54), a magnetic block (55), a guide seat (56), a liquid turning member (57), and a driven magnetic block (58), the base body (51) being installed at the outside of the storage tank (1), and the motor (52) being installed at the top end thereof, the bottom end of the motor (52) being connected to the screw rod by a coupling. The guide seat (56) is connected to the storage tank (1) through a transmission connection, the bottom end of the screw rod (53) is movably connected to the base (51), the inner side of the slide seat (54) is threadedly connected to the screw rod (53), and a magnetic block (55) is fixed to the left end thereof, the right end of the guide seat (56) is fixed to the storage tank (1), and a liquid turning piece (57) is slidably connected therein, a driven magnetic block (58) is fixed to the right end of the liquid turning piece (57), and the driven magnetic block (58) is magnetically connected to the magnetic block (55).

2. According to claim 1, a LNG tank liquid turning device is characterized in that: The liquid turning part (57) comprises a movable connecting seat (571), an upper base plate (572), a lower base plate (573), a flexible wrapping belt (574), and a mounting ring (575). A driven magnetic block (58) is fixed to the left end of the movable connecting seat (571). A mounting ring (575) is fixed to the left end of the flexible wrapping belt (574), and the upper and lower ends thereof are in contact with the upper base plate (572) and the lower base plate (573) respectively. The upper base plate (572) is locked and fixed to the lower base plate (573) by bolts, and the upper base plate (572) and the lower base plate (573) are respectively fixed to the movable connecting seat (571) by bolts.

3. According to claim 1, a LNG tank liquid turning device is characterized in that: The liquid turning mechanism (5) is provided with two groups, and is symmetrically distributed front to back with the round point of the storage tank (1) as the symmetry point.

4. According to claim 2, a LNG tank liquid turning device is characterized in that: The size of the upper substrate (572) is consistent with that of the lower substrate (573), and grooves are arranged on the inner sides thereof.

5. The LNG tank liquid turning device according to claim 2 is characterized in that: Bolts penetrate the interior of the mounting ring (575).

6. The LNG tank liquid turning device according to claim 1, characterized in that: A rectangular groove is provided inside the guide seat (56), and a movable connection seat (571) is slidably connected in the rectangular groove.

7. The LNG tank liquid turning device according to claim 2, characterized in that: The cross section of the flexible wrapping belt (574) is arc-shaped.

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