A high-efficiency heating device for cargo oil tanks of oil tankers

Abstract

This utility model discloses a high-efficiency heating device for cargo oil tanks of oil tankers, applicable to the field of marine oil tank heating devices. Through the use of a suspended stirring frame in conjunction with a limiting structure, the number of suspended stirring frames used for stirring the oil can be automatically adjusted according to changes in the oil level, avoiding transmission losses associated with gear and rack transmissions, saving the output power of the drive motor, and reducing energy consumption on the ship. For the suspended stirring frame located above the oil, when the drive shaft rotates, the corresponding drag-reducing balls of the suspended stirring frame roll into contact with the connecting ring, reducing the friction between them and thus lowering the rotational resistance of the drive shaft, thereby saving the output power of the drive motor. By vertically fixing a scraper at the end of the stirring rod away from the connecting ring, the scraper, rotating with the stirring rod, can effectively remove the oil film formed on the inner wall of the heating tank, thereby improving heating efficiency.

Description

Technical Field

[0001] This utility model relates to the field of marine oil tank heating devices, and in particular to a high-efficiency heating device for cargo oil tanks of oil tankers. Background Technology

[0002] Because cargo oil has high viscosity and high pour point, it needs to be heated during transportation to reduce its viscosity and improve its fluidity, thus facilitating its transport and transshipment, in order to ensure smooth unloading.

[0003] Marine cargo oil heating devices typically have a large internal volume and store a large amount of cargo oil. To ensure uniform heating of the cargo oil, stirring rods are usually installed inside the heating device. If the heating device is deep, multiple sets of stirring rods are usually installed to rotate in tandem to ensure uniform heating of the bottom and top of the cargo oil. However, during use, there may be situations where a portion of the cargo oil is discharged at the unloading point, resulting in the cargo oil volume in the heating device being less than half the volume of the heating device. In this case, the rotation of the stirring rods above the liquid surface will generate useless work, and the system cannot automatically adjust whether to open or close the stirring rods above the liquid surface according to the cargo oil level, thus increasing the energy consumption on board the ship.

[0004] To address the aforementioned issues, a search revealed, for example, a multi-purpose marine oil tank heating device disclosed in patent publication number CN220501008U. This device includes a heating box with an inlet and outlet pipe on its right side. A main stirring rod and a secondary stirring rod are rotatably connected inside the heating box. A drive motor is located on the right side of the heating box, and the output shaft of the drive motor is fixedly connected to one end of the main stirring rod. By using a float that rises and falls with the oil level, when the oil level is higher than the top plate, the drive motor can simultaneously rotate both the main and secondary stirring rods. When a portion of the oil is discharged at the unloading point, reducing the oil level in the heating box to below the top plate, only the main stirring rod rotates to agitate the oil, eliminating the need for the secondary stirring rod. This device automatically activates and deactivates the secondary stirring rod based on the oil level in the heating box, saving the drive motor's output power and reducing energy consumption on the ship.

[0005] However, existing oil tank heating devices similar to those disclosed above involve multiple gears and racks working together. This multi-stage transmission consumes energy and converts it into heat, resulting in significant energy loss. Utility Model Content

[0006] The core of this invention lies in solving the problem of reduced transmission efficiency in existing technologies by using a suspended mixing frame in conjunction with a limiting structure. This also saves on the output power of the drive motor, thus reducing energy consumption on the ship.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A high-efficiency heating device for cargo oil tanks of oil tankers includes a heating box with an oil inlet pipe and an oil outlet pipe installed at the upper and lower ends respectively, and a sealing cap is installed at the pipe openings of the oil inlet pipe and the oil outlet pipe.

[0009] A drive motor is installed at the top center of the heating box, and a stirring mechanism is installed inside the heating box. The output end of the drive motor passes through the top of the heating box and is connected to the stirring mechanism.

[0010] The stirring mechanism includes a drive shaft and multiple suspended stirring racks. The drive shaft is rotatably mounted on the axis of the heating box, and the top end of the drive shaft is fixed to the output end of the drive motor. The multiple suspended stirring racks are vertically slidably mounted on the drive shaft from top to bottom at equal intervals.

[0011] The drive shaft has multiple limiting structures evenly spaced from top to bottom, and each limiting structure corresponds to a single suspended stirring rack.

[0012] By using a suspended agitator in conjunction with a limiting structure, the number of suspended agitators used for agitating the oil can be automatically adjusted according to changes in the oil level. This avoids transmission losses associated with gear and rack drives, saves the output power of the drive motor, and reduces energy consumption on the ship.

[0013] Furthermore, the suspended stirring rack includes a connecting ring and multiple stirring rods. The connecting ring is movably sleeved on the outside of the drive shaft, and the multiple stirring rods are horizontally fixed in a ring array to the side end of the connecting ring. A limiting structure limits the connection ring.

[0014] Furthermore, the limiting structure includes a limiting block and an upper limiting plate integrated on the drive shaft, and a lower limiting plate coaxially rotatably mounted on the drive shaft;

[0015] Multiple limit blocks are provided, and the multiple limit blocks are fixed in a ring array to the side end of the drive shaft. The inner wall of the connecting ring is provided with a limit slot that matches the limit blocks.

[0016] The upper limit plate and the lower limit plate are located on the upper and lower sides of the limit block, respectively, and the distance between the lower limit plate and the limit block is greater than the axial length of the connecting ring.

[0017] Furthermore, the opening of the limiting slot is larger than the thickness of the limiting block.

[0018] Furthermore, multiple drag-reducing balls are equidistantly installed at the upper end of the lower limit plate.

[0019] Furthermore, the density of the stirring rod is less than the density of the oil inside the heating box, and the stirring rod is a hollow tube.

[0020] Furthermore, a scraper is vertically fixed at the end of the stirring rod away from the connecting ring, and the scraper is slidably fitted against the inner wall of the heating box.

[0021] Furthermore, a manhole is provided at the top of the heating chamber, and a safety cover is provided at the manhole.

[0022] Compared with existing technologies, the advantages of this utility model are:

[0023] (1) This solution, through the use of a suspended stirring frame and a limiting structure, can automatically adjust the number of suspended stirring frames used for stirring the oil according to the change of oil level, thus avoiding the transmission loss of gear and rack transmission, saving the output power of the drive motor, and saving energy consumption on the ship.

[0024] (2) This solution has multiple drag-reducing balls installed at equal intervals on the upper end of the lower limit plate. For the suspended agitator located on the upper side of the oil, when the drive shaft rotates, the drag-reducing balls corresponding to the suspended agitator and the connecting ring roll into contact, which can reduce the friction between the two, thereby reducing the rotational resistance of the drive shaft and thus saving the output power of the drive motor.

[0025] (3) This solution has a scraper vertically fixed at the end of the stirring rod away from the connecting ring. The scraper is slidably attached to the inner wall of the heating box. As the stirring rod rotates, the scraper can effectively remove the oil film formed on the inner wall of the heating box, thereby improving the heating efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the present invention with the sealing cap and safety cap removed;

[0028] Figure 3 This is a cross-sectional structural diagram of the heating box of this utility model;

[0029] Figure 4 This is a structural schematic diagram of the suspended stirring frame of this utility model;

[0030] Figure 5 This is a partial structural schematic diagram of the drive shaft of this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the suspended stirring rack of this utility model.

[0032] Explanation of the labels in the diagram:

[0033] 1. Heating chamber; 101. Manhole; 2. Oil inlet pipe; 3. Oil outlet pipe; 4. Sealing cover; 5. Drive motor; 6. Drive shaft; 601. Limiting block; 602. Upper limit plate; 603. Lower limit plate; 604. Drag-reducing ball bearing; 7. Suspended stirring rack; 71. Stirring rod; 72. Connecting ring; 7201. Limiting groove; 73. Scraper; 8. Safety cover. Detailed Implementation

[0034] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0035] First implementation method:

[0036] Please see Figure 1-6 A high-efficiency heating device for cargo oil tanks on oil tankers includes a heating box 1 with an oil inlet pipe 2 and an oil outlet pipe 3 installed at its upper and lower ends, respectively. Both the inlet pipe 2 and the outlet pipe 3 are equipped with conventional sealing caps 4. The heating box 1 can be a conventional oil heating box body, that is, the heating box 1 adopts a conventional multi-layer shell structure, such as including an inner oil contact layer (e.g., 304 stainless steel), an electric heating wire (e.g., iron-chromium-aluminum alloy), an intermediate insulation layer (e.g., composed of aluminum silicate fiber felt), and an outer structural layer (e.g., carbon steel plate) arranged sequentially from the inside to the outside. Of course, a conventional exhaust valve (not shown in the figure) can be added to the sealing cap 4 corresponding to the oil inlet pipe 2.

[0037] The heating box 1 is equipped with a manhole 101 at the top, and a safety cover 8 is provided at the manhole 101 to facilitate inspection and maintenance by staff.

[0038] The heating box 1 has a drive motor 5 installed at the top center and a stirring mechanism installed inside. The output end of the drive motor 5 passes through the top of the heating box 1 and is connected to the stirring mechanism. Specifically, the stirring mechanism includes a drive shaft 6 and multiple suspended stirring racks 7. The drive shaft 6 is rotatably mounted on the axis of the heating box 1 and the top end of the drive shaft 6 is fixed to the output end of the drive motor 5. Multiple suspended stirring racks 7 are vertically slidably mounted on the drive shaft 6 at equal intervals from top to bottom. Multiple limiting structures are equally spaced from top to bottom on the drive shaft 6, and the multiple limiting structures correspond one-to-one with the multiple suspended stirring racks 7.

[0039] By using the suspended agitator 7 in conjunction with the limiting structure, the number of suspended agitators 7 used for agitating the oil can be automatically adjusted according to changes in the oil level, avoiding transmission losses in gear and rack transmission, saving the output power of the drive motor 5, and saving energy consumption on the ship.

[0040] Regarding the suspended mixing rack 7, specifically, as follows: Figure 4As shown, the suspended stirring rack 7 includes a connecting ring 72 and a plurality of stirring rods 71. The connecting ring 72 is movably sleeved on the outside of the drive shaft 6, and the plurality of stirring rods 71 ​​are horizontally fixed in a ring array to the side end of the connecting ring 72. A limiting structure limits the connecting ring 72.

[0041] Regarding the limiting structure, specifically, such as Figure 5 As shown, the limiting structure includes a limiting block 601 and an upper limiting disk 602 integrally mounted on the drive shaft 6, and a lower limiting disk 603 coaxially rotatably mounted on the drive shaft 6. Multiple limiting blocks 601 are provided, and the multiple limiting blocks 601 are fixed in a circular array to the side end of the drive shaft 6. The inner wall of the connecting ring 72 is provided with a limiting groove 7201 that is adapted to the limiting blocks 601. The upper limiting disk 602 and the lower limiting disk 603 are located on the upper and lower sides of the limiting block 601, respectively. The distance between the lower limiting disk 603 and the limiting block 601 is greater than the axial length of the connecting ring 72.

[0042] Based on the above structural configuration, the suspended stirring frame 7 immersed in the oil is in a suspended state. At this time, the limiting groove 7201 on the connecting ring 72 corresponding to the suspended stirring frame 7 will be matched with the corresponding limiting block 601, and the limiting plate 602 limits the suspended stirring frame 7. The suspended stirring frame 7 rotates with the drive shaft 6, stirring the oil and achieving uniform heating of the oil. Since the rotating suspended stirring frame 7 is in a suspended state, the rotational load of the drive shaft 6 can be significantly reduced. As the oil is discharged, the oil level drops, and the suspended stirring frame 7 not immersed in the oil will detach from the limiting block 601 under its own gravity. At this time, the suspended stirring frame 7 loses its horizontal limiting function, and the lower limiting plate 603 limits the suspended stirring frame 7. The suspended stirring frame 7 is less likely to rotate with the drive shaft 6, thereby reducing the rotational load of the drive shaft 6.

[0043] In order for the limiting block 601 to be smoothly inserted into the limiting slot 7201, the opening of the limiting slot 7201 is larger than the thickness of the limiting block 601.

[0044] The density of the stirring rod 71 is less than the density of the oil inside the heating box 1, and the stirring rod 71 is a hollow tube, which ensures that the suspended stirring frame 7 can be stably suspended in the oil.

[0045] Second implementation method:

[0046] Based on the first embodiment, multiple drag-reducing balls 604 are equidistantly installed on the upper end of the lower limit plate 603. For the suspended stirring frame 7 located on the upper side of the oil, when the drive shaft 6 rotates, the drag-reducing balls 604 corresponding to the suspended stirring frame 7 roll into contact with the connecting ring 72, which can reduce the friction between the two, thereby reducing the rotational resistance of the drive shaft 6 and thus saving the output power of the drive motor 5.

[0047] The third implementation method:

[0048] Based on the first and second embodiments, a scraper 73 is vertically fixed at the end of the stirring rod 71 away from the connecting ring 72. The scraper 73 is slidably attached to the inner wall of the heating box 1. As the stirring rod 71 rotates, the scraper 73 can effectively remove the oil film formed on the inner wall of the heating box 1, thereby improving the heating efficiency.

[0049] It should be noted that the specific models and specifications of the electrical equipment involved in this solution need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt the existing technology in this field, so they will not be described in detail. The power supply and principle of the electrical equipment involved are clear to those skilled in the art, and will not be described in detail here.

[0050] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A high-efficiency heating device for cargo oil tanks of oil tankers, comprising a heating box (1) with an oil inlet pipe (2) and an oil outlet pipe (3) respectively installed at its upper and lower ends, wherein a sealing cap (4) is installed at the inlet of the oil inlet pipe (2) and the outlet of the oil outlet pipe (3), characterized in that: A drive motor (5) is installed at the top center of the heating box (1), and a stirring mechanism is provided inside the heating box (1). The output end of the drive motor (5) passes through the top of the heating box (1) and is connected to the stirring mechanism. The stirring mechanism includes a drive shaft (6) and multiple suspended stirring racks (7). The drive shaft (6) is rotatably mounted on the axis of the heating box (1). The top end of the drive shaft (6) is fixed to the output end of the drive motor (5). The multiple suspended stirring racks (7) are vertically and equidistantly mounted on the drive shaft (6) from top to bottom. The drive shaft (6) is provided with multiple limiting structures at equal intervals from top to bottom, and the multiple limiting structures are provided in a one-to-one correspondence with multiple suspended stirring racks (7).

2. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 1, characterized in that: The suspended stirring rack (7) includes a connecting ring (72) and multiple stirring rods (71). The connecting ring (72) is movably sleeved on the outside of the drive shaft (6). The multiple stirring rods (71) are arranged in a ring array and horizontally fixed to the side end of the connecting ring (72). The limiting structure limits the connecting ring (72).

3. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 2, characterized in that: The limiting structure includes a limiting block (601) and an upper limiting plate (602) integrally set on the transmission shaft (6), and a lower limiting plate (603) coaxially rotatably mounted on the transmission shaft (6); The limiting block (601) is provided in multiple ways, and the multiple limiting blocks (601) are fixed in a ring array to the side end of the transmission shaft (6). The inner wall of the connecting ring (72) is provided with a limiting groove (7201) that is adapted to the limiting block (601). The upper limit plate (602) and the lower limit plate (603) are located on the upper and lower sides of the limit block (601), respectively. The distance between the lower limit plate (603) and the limit block (601) is greater than the axial length of the connecting ring (72).

4. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 3, characterized in that: The opening of the limiting slot (7201) is greater than the thickness of the limiting block (601).

5. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 3, characterized in that: Multiple drag-reducing balls (604) are equidistantly installed on the upper end of the lower limit plate (603).

6. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 2, characterized in that: The density of the stirring rod (71) is less than the density of the oil inside the heating box (1), and the stirring rod (71) is a hollow tube.

7. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 2, characterized in that: A scraper (73) is vertically fixed at the end of the stirring rod (71) away from the connecting ring (72), and the scraper (73) is slidably attached to the inner wall of the heating box (1).

8. The high-efficiency heating device for cargo oil tanks of oil tankers according to claim 1, characterized in that: The heating box (1) has a manhole (101) at the top and a safety cover (8) at the manhole (101).

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