A large hollow bearing and solid stub shaft liquid nitrogen cooling device

Abstract

The application belongs to the technical field of stern roller manufacturing, and particularly relates to a liquid nitrogen cooling device for large hollow bearings and solid short shafts. The liquid nitrogen cooling device for large hollow bearings and solid short shafts is characterized by comprising a box body, a box cover arranged above the box body, and a sealing ring arranged between the box body and the box cover. The box body comprises an outer cylinder body and an inner cylinder body, a cold insulation layer arranged between the inner cylinder body and the outer cylinder body, and an inner cylinder dividing assembly arranged in the inner cylinder body. The box body is provided with a temperature measuring port, a pressure measuring port, a vacuumizing port and a nitrogen filling port. The inner cylinder dividing assembly comprises a dividing cylinder body fixed to the inner cylinder body, a support assembly fixed to the bottom of the dividing cylinder body, and a cover plate assembly installed on the upper portion of the dividing cylinder body. The entire liquid nitrogen cooling device is divided into two relatively independent parts by the inner cylinder dividing assembly, one space is used for cooling the large hollow bearing, and the other space is used for cooling the solid short shaft. The two spaces can work independently, simultaneously or can be cooled by each other.

Description

Technical Field

[0001] This invention belongs to the field of stern roller manufacturing technology, specifically relating to a liquid nitrogen cooling device for a large hollow bearing and a solid short shaft. Background Technology

[0002] Offshore engineering vessels are primarily responsible for providing human resources and materials for offshore engineering projects, while also ensuring marine transportation and towing of marine structures. The stern rollers play a crucial role in detaching cables or anchor chains from the stern deck, thus reducing hull wear. Cold installation is an indispensable step in the installation of stern rollers.

[0003] In recent years, single and double stern rollers for ships have appeared on the market in large numbers. With the increasing size of stern rollers, hollow bearings and short shafts are also gradually becoming larger. Hollow bearings, in particular, due to their hollow structure, will inevitably consume more cooling medium if a traditional independent cooling device is used, increasing the time and procurement cost of transporting the cooling medium, thus increasing the manufacturing cost of stern rollers and making the entire cooling time too long and the cooling efficiency low. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology in the cold assembly process of the stern roller installation, which has excessively long cooling time and low cooling efficiency, and to provide a liquid nitrogen cooling device for large hollow bearings and solid short shafts that can save cooling medium and shorten cooling time.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A liquid nitrogen cooling device for a large hollow bearing and a solid short shaft includes a housing, a cover disposed above the housing, and a sealing ring disposed between the housing and the cover.

[0007] The enclosure includes an outer cylinder and an inner cylinder, a cold insulation layer disposed between the inner cylinder and the outer cylinder, and an inner cylinder dividing assembly disposed inside the inner cylinder; both the enclosure and the inner cylinder dividing assembly are provided with a temperature measuring port, a pressure measuring port, a vacuum port and a nitrogen filling port; the inner cylinder dividing assembly includes a dividing cylinder fixed to the inner cylinder, a support assembly fixed to the bottom of the dividing cylinder, and a cover plate assembly installed on the upper part of the dividing cylinder.

[0008] Furthermore, the box cover includes an upper plate, cylindrical sections fixed on both sides of the upper plate, and a bottom plate fixed on the cylindrical sections; a cold insulation layer is provided between the upper plate and the bottom plate, and at least one handle is installed on the upper plate.

[0009] Furthermore, the box body is equipped with lifting lugs.

[0010] Furthermore, there are two of each of the temperature measuring port, pressure measuring port, vacuum port, and nitrogen filling port.

[0011] Furthermore, the support assembly includes a lower ring plate disposed at the bottom of the segmented cylinder, a support seat fixed on the lower ring plate, and a support plate fixed on the support seat; a sealing ring is provided between the lower ring plate and the housing.

[0012] Furthermore, the cover plate assembly includes an upper ring plate and a segmented cylindrical cover plate disposed on the upper ring plate; a sealing ring is provided between the upper ring plate and the segmented cylindrical body.

[0013] Furthermore, the inner side plate for fixing the cold insulation layer in the box body and the box cover is an S30408 ​​stainless steel container plate, and the outer side plate is a Q235B ordinary carbon structural steel plate.

[0014] Furthermore, the sealing ring material is expanded polytetrafluoroethylene sheet.

[0015] Furthermore, the bottom surface of the housing is a planar structure. The beneficial effects of the liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to the present invention are:

[0016] 1. This invention uses an inner cylinder dividing assembly to divide the entire liquid nitrogen cooling device into two relatively independent parts. One space is used to cool large hollow bearings, and the other space is used to cool solid short shafts. The two spaces can work independently or simultaneously and can cool each other. This not only slows down the heating rate of the cooling medium, shortens the cooling time, and improves cooling efficiency, but also saves on the amount of cooling medium used, reducing the cost of purchasing and transporting the cooling medium.

[0017] 2. The main material used for the housing, cover, etc. of the liquid nitrogen cooling device of this invention is structural steel plate, which is readily available and inexpensive, reducing the manufacturing cost of the device. Moreover, the entire cooling device has a simple structure, is easy to manufacture and operate, and has a wide range of applications. It can effectively improve the efficiency and economy of manufacturing stern rollers. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a cross-sectional view of an embodiment of the present invention;

[0020] Figure 2 This is a top view of an embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the cylinder according to an embodiment of the present invention;

[0022] Figure 4 This is a top view of the cylindrical body according to an embodiment of the present invention;

[0023] Figure 5 This is a detailed view of the cover plate assembly according to an embodiment of the present invention;

[0024] Figure 6 This is a detailed diagram of the support component according to an embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of the box lid according to an embodiment of the present invention;

[0026] Figure 8 This is a top view of the box lid according to an embodiment of the present invention.

[0027] In the diagram: 1. Box cover, 11. Upper plate, 12. Bottom plate, 13. Handle, 14. Cylindrical section, 2. Box body, 21. Outer cylinder, 22. Inner cylinder, 24. Temperature measuring port, 25. Pressure measuring port, 26. Vacuum port, 261. First vacuum port, 262. Second vacuum port, 27. Nitrogen filling port, 28. Inner cylinder dividing assembly, 281. Dividing cylinder, 282. Support assembly, 2821. Lower ring plate, 2822. Support base, 2823. Support plate, 2824. Sealing gasket, 283. Cover plate assembly, 2831. Upper ring plate, 2832. Dividing cylinder cover plate, 2833. Washer, 29. Lifting lug, 4. Solid short shaft, 5. Hollow bearing. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0029] like Figures 1-8 The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft of the present invention, shown in the figure, includes a housing 2, a housing cover 1 disposed above the housing 2, and a sealing ring disposed between the housing 2 and the housing cover 1. The housing 2 includes an outer cylinder 21 and an inner cylinder 22, a cold insulation layer disposed between the inner cylinder 22 and the outer cylinder 21, and an inner cylinder dividing assembly 28 disposed inside the inner cylinder 22. Both the housing 2 and the inner cylinder dividing assembly 28 are provided with a temperature measuring port 24, a pressure measuring port 25, a vacuum port 26, and a nitrogen filling port 27. The inner cylinder dividing assembly 28 includes a dividing cylinder 281 fixed to the inner cylinder 22, a support assembly 282 fixed to the bottom of the dividing cylinder 281, and a cover plate assembly 283 installed on the upper part of the dividing cylinder 281. The inner cylinder dividing assembly 28 divides the interior of the housing 2 into two relatively independent spaces, one space for cooling the large hollow bearing 5 and the other space for cooling the solid short shaft 4. The two spaces can work independently or simultaneously and can cool each other.

[0030] The inner cylinder 22 of the enclosure 2 is welded with temperature measuring port 24, pressure measuring port 25, liquid nitrogen inlet assembly, and vacuum port 26 assembly. After welding, a kerosene leakage test is performed to ensure that the welded joints do not leak. The temperature measuring port 24, pressure measuring port 25, liquid nitrogen inlet assembly, vacuum port 26 assembly, and kerosene leakage test are all existing technologies and will not be described in detail here. It is made of steel plate (except for the cold insulation layer), and the parts are connected by welding. The inner bottom plate 12 is welded to the inner cylinder 22, and the temperature measuring port assembly, pressure measuring port assembly, liquid nitrogen inlet assembly, and vacuum port assembly are welded. After welding, a kerosene leakage test is performed. The cold insulation layer at the bottom of the enclosure 2 is assembled, and the outer bottom plate 12 is welded. The outer cylinder 21 is installed and welded. The outer cold insulation layer of the inner cylinder 22 is assembled, and the pressure plate is welded. The protruding parts of each pipe can be individually wrapped with cold insulation and fixed. The obstruction parts between the inner cylinder 22 and the bottom pipe should be notched. The connection parts between the outer cylinder 21 and the pipe can be assembled in sections. The outer cylinder 21 is made of rolled and welded steel plate, and the weld joint should be beveled and fully welded. The outer diameter should be about 2mm to 3mm smaller than the inner diameter of the cylinder section 14 on the cover 1, and the outer weld seam within a length of about 30mm at the top should be ground flat so that the outer cylinder 21 and the connecting pipe are not welded when the cover 1 is assembled, and the connection part with the connecting pipe can be assembled in pieces.

[0031] In this embodiment of the invention, the box cover 1 includes an upper plate 11, cylindrical sections 14 fixed on both sides of the upper plate 11, and a bottom plate 12 fixed on the cylindrical sections 14. A cold insulation layer is provided between the upper plate 11 and the bottom plate 12. At least one handle 13 is installed on the upper plate 11, and lifting lugs 29 are also provided on the box body 2. Both the box body 2 and the box cover 1 include a cold insulation layer made of expanded perlite. This cold insulation layer is fixed by a steel plate and is used to block the heat exchange between the cooling medium (liquid nitrogen) and the air during the cooling process, slowing down the heating rate of the cooling medium, shortening the cooling time, and improving the cooling efficiency. The lifting lugs 29 on the box body 2 and the handles 13 on the box cover 1 are used for lifting the box body 2 and the box cover 1. Except for the cold insulation layer, all parts of the box cover 1 are made of steel plate, and the parts are connected by welding. The bottom plate 12 is welded to the cylindrical section 14 of the box cover 1. After welding, a kerosene leakage test is performed to ensure that the weld joint does not leak. The cold insulation layer is then installed and compacted, and the upper plate 11 is welded. When welding the bottom plate 12 of the cover 1 and the cylindrical section 14 of the cover 1, control the welding deformation and ensure the flatness of the bottom plate 12 to facilitate the sealing between the cover 1 and the box body 2.

[0032] like Figures 3 to 4As shown, both the housing 2 and the inner cylinder partition assembly 28 are equipped with a temperature measuring port 24, a pressure measuring port 25, a vacuum port 26, and a nitrogen filling port 27. One of these ports is connected to the housing 2, while the other is connected to the inner cylinder partition assembly 281. When the temperature or pressure increases, some nitrogen can be discharged through the vacuum port 26, and new nitrogen can be introduced through the nitrogen filling port 27 to reduce the pressure and temperature within the cooling space.

[0033] The two vacuum ports 26 are a first vacuum port 261 connected to the segmented cylinder and a second vacuum port 262 connected to the inner cylinder of the housing, which can respectively realize the vacuuming of two independent spaces. In this way, when the inner cylinder assembly is working, the space outside the inner cylinder assembly can be evacuated; when cooling the large hollow bearing, the inner side of the inner cylinder assembly can be evacuated, which will greatly improve the cooling efficiency.

[0034] In the embodiments of the present invention, such as Figure 7 and Figure 8 The lid 1 shown can be placed over the box body 2. The lid 1 is welded to an appropriate length above the outer circumference of the box body 2 and then machined to facilitate quick installation and ensure a good seal. In this embodiment, the inner steel plate fixing the cold insulation layer in the box body 2 and lid 1 is an S30408 ​​stainless steel container plate, which meets the low-temperature requirements of liquid nitrogen; the outer steel plate is a Q235B ordinary carbon structural steel plate. The bottom surface of the box body 2 is a planar structure, allowing it to be placed on any planar structure or directly on a horizontal surface during operation.

[0035] In this embodiment of the invention, the support assembly 282 includes a lower ring plate 2821 disposed at the bottom of the segmented cylinder 281, a support seat 2822 fixed on the lower ring plate 2821, and a support plate 2823 fixed on the support seat 2822; a sealing ring is provided between the lower ring plate 2821 and the housing 2. The cover plate assembly 283 includes an upper ring plate 2831 and a segmented cylinder cover plate 2832 disposed on the upper ring plate 2831; a sealing ring is provided between the upper ring plate 2831 and the segmented cylinder 281. The sealing ring material is expanded polytetrafluoroethylene sheet, used for sealing during device operation, and has good low-temperature resistance.

[0036] When the two relatively independent spaces on both sides of the inner cylinder dividing assembly 28 are working independently, the non-working space should be evacuated through the vacuum port 26 to improve the cooling effect.

[0037] During the cooling process, when the temperature and pressure of the cooling space increase, some nitrogen can be discharged through the vacuum port 26 and new nitrogen can be introduced through the nitrogen filling port 27 to reduce the pressure and temperature in the cooling space.

[0038] The inner cylinder segmentation assembly 28 can be fitted with inner cylinder segmentation assemblies 28 of different diameters according to the inner diameter of the hollow bearing 5 and the outer diameter of the solid short shaft 4, so as to improve the cooling efficiency.

[0039] It should be understood that the specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of the invention. Obvious variations or modifications derived from the spirit of the invention are still within the protection scope of the invention.

Claims

1. A liquid nitrogen cooling device for a large hollow bearing and a solid short shaft, characterized in that: Includes a box body (2), a box cover (1) disposed above the box body (2), and a sealing ring disposed between the box body (2) and the box cover (1); The housing (2) includes an outer cylinder (21) and an inner cylinder (22), a cold insulation layer disposed between the inner cylinder (22) and the outer cylinder (21), and an inner cylinder partition assembly (28) disposed inside the inner cylinder (22); the housing (2) and the inner cylinder partition assembly (28) are each provided with a temperature measuring port (24), a pressure measuring port (25), a vacuum port (26) and a nitrogen filling port (27); The inner cylinder dividing assembly (28) includes a dividing cylinder (281) fixed on the inner cylinder (22), a support assembly (282) fixed at the bottom of the dividing cylinder (281), and a cover plate assembly (283) installed on the upper part of the dividing cylinder (281). The vacuum port (26) is divided into a first vacuum port (261) connected to the dividing cylinder (281) and a second vacuum port (262) connected to the inner cylinder (22) of the box (2), so as to realize the vacuuming of two independent spaces respectively; When the two relatively independent spaces on both sides of the inner cylinder dividing assembly (28) work independently, the space that is not working should be evacuated through the vacuum port (26) to improve the cooling effect; that is, when the inner cylinder dividing assembly (28) is working, the space outside the inner cylinder dividing assembly (28) is evacuated; when cooling the large hollow bearing, the space inside the inner cylinder dividing assembly (28) is evacuated.

2. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: The box cover (1) includes an upper plate (11), cylindrical sections (14) fixed on both sides of the upper plate (11), and a bottom plate (12) fixed on the cylindrical section (14); a cold insulation layer is provided between the upper plate (11) and the bottom plate (12), and at least one handle (13) is installed on the upper plate (11).

3. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: The box (2) is provided with lifting lugs (29).

4. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: There are two temperature measuring ports (24), two pressure measuring ports (25), two vacuum ports (26), and two nitrogen filling ports (27).

5. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: The support assembly (282) includes a lower ring plate (2821) disposed at the bottom of the segmented cylinder (281), a support seat (2822) fixed on the lower ring plate (2821), and a support plate (2823) fixed on the support seat (2822); a sealing ring is provided between the lower ring plate (2821) and the box body (2).

6. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: The cover plate assembly (283) includes an upper ring plate (2831) and a segmented cylinder cover plate (2832) disposed on the upper ring plate (2831); a sealing ring is provided between the upper ring plate (2831) and the segmented cylinder (281).

7. A liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to any one of claims 1, characterized in that: The inner side plate of the box body (2) and the box cover (1) that fixes the cold insulation layer is an S30408 ​​stainless steel container plate, and the outer side plate is a Q235B ordinary carbon structural steel plate.

8. A liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to any one of claims 5 or 6, characterized in that: The sealing ring material is expanded polytetrafluoroethylene sheet.

9. The liquid nitrogen cooling device for a large hollow bearing and a solid short shaft according to claim 1, characterized in that: The bottom surface of the box (2) is a planar structure.

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