Closed hull exhaust structure with cooling function
By designing a closed cooling structure in the hull exhaust structure, and using the combination of cooling shell and through holes, efficient cooling of the exhaust pipe and mixed cooling of water and gas is achieved, solving the problem of unsatisfactory cooling effect in the prior art, improving the heat dissipation effect and reducing heat energy transfer.
Patent Information
- Application Number
- CN202510097607.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-08
- Publication Date
- 2025-05-27
AI Technical Summary
The existing wet exhaust structure has poor cooling effect on the exhaust pipe and has not fully realized the significance of water and gas mixed cooling.
A closed cooling structure is designed, the cooling housing cover is provided on the outer wall of the exhaust pipe, and the inner wall and the outer wall of the exhaust pipe are connected with the chamber surrounded by the outer wall of the exhaust pipe. The exhaust pipe wall is provided with a through hole, and the two ends of the through hole are connected to the inner cavity and chamber of the exhaust pipe respectively. The cooling medium is heat exchanged with the outer wall and inner wall of the exhaust pipe through the through hole.
It effectively reduces the temperature of the outer wall of the exhaust pipe, fully realizes the purpose of water and gas mixed cooling, improves the heat dissipation effect of the ship's exhaust process, reduces the heat energy transferred to the hull, and avoids paint removal and aging problems caused by heat from the hull.
Smart Images
Figure CN120042680A_ABST
Abstract
Description
[0001] This divisional application is based on the mother patent application with the filing date of September 8, 2020, application number CN202010932788.5, and the title of "A Cooling Structure and a Hull Exhaust Structure with the Cooling Structure". Technical Field
[0002] The present invention relates to the technical field of ship equipment, and particularly to a closed hull exhaust structure with a cooling function. Background Art
[0003] The exhaust types of ships include dry exhaust type and wet exhaust type. The dry exhaust type generally sets up a chimney passage and discharges it above the compass deck. The wet exhaust type generally mixes water and gas for cooling at an appropriate position behind the supercharger and then discharges the gas to both sides. The dry exhaust type has the disadvantages of large volume, large mass, and being unfavorable for the heat dissipation of the engine room. Although the wet exhaust type has a slight advantage over the dry exhaust type in terms of volume and mass, the current design of the wet exhaust structure has an unsatisfactory cooling effect on the exhaust pipe. The existing wet exhaust type generally sprays coolant on the outer wall of the exhaust pipe by spraying to reduce the temperature of the pipe wall, and does not fully realize the meaning of water-gas mixing and cooling. Summary of the Invention
[0004] In order to overcome the defects of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a closed hull exhaust structure with a cooling function, which can improve the cooling effect on the exhaust pipe of the wet exhaust type.
[0005] In order to solve the above technical problem, the technical solution adopted by the present invention is: a closed hull exhaust structure with a cooling function, including an exhaust pipe and a cooling housing; The cooling housing covers the outer wall of the exhaust pipe, and a cooling medium is passed through the chamber formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. Through holes are provided on the pipe wall of the exhaust pipe, and both ends of the through holes are respectively communicated with the inner cavity of the exhaust pipe and the chamber.
[0006] In an optional embodiment, the cooling housing is arranged along the circumferential direction of the exhaust pipe, and two or more of the through holes are arranged at intervals along the circumferential direction of the exhaust pipe on the pipe wall, and two or more of the through holes are arranged at intervals along the generatrix of the exhaust pipe on the pipe wall.
[0007] In an optional embodiment, the distance between any two adjacent through holes arranged at intervals along the generatrix of the exhaust pipe ranges from 20 mm to 60 mm, and the number of the through holes arranged at intervals along the circumferential direction of the exhaust pipe is 8 to 12.
[0008] In an optional embodiment, the aperture range of the through holes is from 5 mm to 15 mm.
[0009] In an alternative embodiment, a cooling medium inlet is formed in a side wall of the cooling housing, and a flux of the cooling medium inlet is greater than a flux of the through hole.
[0010] In an alternative embodiment, a cross-sectional shape of a pipe wall of the exhaust duct and a cross-sectional shape of an inner wall of the cooling housing are both circular.
[0011] In an alternative embodiment, the exhaust duct and the cooling housing are connected by welding.
[0012] The present invention further provides a hull exhaust structure, which further includes a main engine exhaust pipe and an outer hull plate. Two ends of the exhaust duct are respectively connected to an exhaust port of the main engine exhaust pipe and an exhaust port of the outer hull plate.
[0013] In an alternative embodiment, a refrigeration system is further included. The cooling medium is cooling water, and the cooling water is introduced into the chamber after being cooled by the refrigeration system.
[0014] In an alternative embodiment, a seat plate is further included. The seat plate is welded to an inner wall of the outer hull plate. The exhaust duct is locked to the seat plate, and an opening is formed at a position of the seat plate corresponding to the exhaust port of the outer hull plate.
[0015] The beneficial effects of the present invention are as follows: A cooling structure is provided. The cooling housing is sleeved on an outer wall of the exhaust duct, and a chamber for storing and circulating a cooling medium is formed by an inner wall of the cooling housing and the outer wall of the exhaust duct. This closed cooling structure can avoid an increase in temperature inside the cabin. Through holes are formed in a pipe wall of the exhaust duct so that the chamber communicates with an inner cavity of the exhaust duct. The cooling medium in the chamber exchanges heat with the outer wall of the exhaust duct after contact, so that the temperature of the outer wall of the exhaust duct is reduced. Since a hot air flow velocity in the exhaust duct is high and a pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust duct through the through holes and exchange heat with an inner wall of the exhaust duct, fully achieving the purpose of cooling by mixing water and gas, and having the advantages of energy conservation and consumption reduction. The present invention further provides a hull exhaust structure. An intake end of the exhaust duct is connected to the main engine exhaust pipe, and an outlet end of the exhaust duct is connected to the exhaust port of the outer hull plate. According to the working principle of the above cooling structure, high-temperature gas generated by the main engine is introduced into the exhaust duct through the main engine exhaust pipe, and then is cooled to become low-temperature gas under the cooling action of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port of the outer hull plate, thereby improving a heat dissipation effect in the exhaust process of the ship, reducing heat energy transferred from the exhaust duct to the hull, and avoiding problems such as paint stripping and aging of the hull caused by heat. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The figure shows a schematic structural diagram of the cooling structure according to an embodiment of the present invention; Figure 2The figure shows a cross-sectional view taken along line A-A of the cooling structure according to an embodiment of the present invention; Figure 3 The figure shows a schematic structural view of the hull exhaust structure according to an embodiment of the present invention; Reference numeral description: 1. Exhaust pipe; 11. Through hole; 2. Cooling housing; 3. Main engine exhaust pipe; 4. Outer hull plate; 5. Seat plate. Detailed implementation manners
[0017] To describe in detail the technical content, achieved object and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the accompanying drawings.
[0018] Please refer to Figures 1 to 3 As shown in the figure, a cooling structure of the present invention includes an exhaust pipe and a cooling housing; The cooling housing covers the outer wall of the exhaust pipe. A cooling medium is passed through the chamber formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. Through holes are provided on the pipe wall of the exhaust pipe, and both ends of the through holes are respectively communicated with the inner cavity of the exhaust pipe and the chamber.
[0019] It can be seen from the above description that the beneficial effect of the present invention is to provide a cooling structure. The cooling housing is covered on the outer wall of the exhaust pipe, and a chamber for storing and circulating the cooling medium is formed by the inner wall of the cooling housing and the outer wall of the exhaust pipe. This closed cooling structure can avoid the rise of the temperature in the cabin. Through holes are opened on the pipe wall of the exhaust pipe so that the chamber is communicated with the inner cavity of the exhaust pipe. The cooling medium in the chamber contacts the outer wall of the exhaust pipe and then conducts heat exchange, so that the temperature of the outer wall of the exhaust pipe is reduced. Since the hot air flow velocity in the exhaust pipe is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust pipe through the through holes and contact the inner wall of the exhaust pipe for heat exchange, fully achieving the purpose of cooling by mixing water and gas, and having the advantages of energy saving and consumption reduction.
[0020] Furthermore, the cooling housing is arranged along the circumferential direction of the exhaust pipe. Two or more of the through holes are arranged at intervals along the circumferential direction of the exhaust pipe on the pipe wall, and two or more of the through holes are arranged at intervals along the generatrix of the exhaust pipe on the pipe wall.
[0021] It can be seen from the above description that the structural design of introducing the cooling medium through multiple holes can improve the uniformity and efficiency of heat dissipation of the exhaust pipe, and prevent problems such as aging and carbon deposition caused by uneven pipe wall temperature.
[0022] Furthermore, the distance between any two adjacent through-holes arranged at intervals along the generatrix of the exhaust pipe ranges from 20 mm to 60 mm, and the number of through-holes arranged at intervals along the circumference of the exhaust pipe is 8 to 12.
[0023] As can be seen from the above description, through experimental measurement, the through-hole arrangement structure within this interval range can fully achieve the heat exchange effect between the cooling medium and the pipe wall of the exhaust pipe and the hot gas inside the exhaust pipe, and balance the load of the refrigeration system, achieving the purpose of energy conservation and consumption reduction.
[0024] Furthermore, the aperture range of the through-holes is from 5 mm to 15 mm.
[0025] As can be seen from the above description, if the aperture of the through-hole is designed too large, the heat exchange time of the cooling medium on the outer wall of the exhaust pipe will be correspondingly shortened, which not only increases energy consumption but also affects the cooling effect of the exhaust pipe; if the aperture of the through-hole is designed too small, it is not conducive to the cooling medium entering the inner cavity of the exhaust pipe, reducing the water-vapor mixing effect between the cooling medium and the hot gas, and also causing the cooling effect to be affected.
[0026] Furthermore, a cooling medium inlet is provided on the side wall of the cooling housing, and the flux of the cooling medium inlet is greater than the flux of the through-holes.
[0027] As can be seen from the above description, designing the flux of the cooling medium inlet to be greater than the total flux of the through-holes ensures that the cooling medium should fill the entire chamber and has a certain kinetic energy when passing through the through-holes, so as to achieve better cooling of the side wall of the exhaust pipe and sufficient water-vapor mixing cooling.
[0028] Furthermore, the cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling housing are both circular.
[0029] As can be seen from the above description, the circular cross-sectional design increases the heat exchange area between the cooling medium and the exhaust pipe and can reduce the energy consumption generated during the cooling operation.
[0030] Furthermore, the exhaust pipe and the cooling housing are connected by welding.
[0031] As can be seen from the above description, the exhaust pipe and the cooling housing are prefabricated and welded together, which can be directly installed on the required equipment, reducing the difficulty of on-site installation and facilitating production improvement.
[0032] A hull exhaust structure further includes a main engine exhaust pipe and an outer shipboard plate, and both ends of the exhaust pipe are respectively connected to the exhaust port of the main engine exhaust pipe and the exhaust port of the outer shipboard plate.
[0033] As can be seen from the above description, the beneficial effects of the present invention are as follows: A hull exhaust structure is provided, where the intake end of the exhaust pipe is connected to the main engine exhaust pipe, and the outlet end of the exhaust pipe is connected to the exhaust port on the outer hull plate. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine passes through the main engine exhaust pipe into the exhaust pipe, and then is cooled to become low-temperature gas under the cooling effect of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port on the outer hull plate, thereby improving the heat dissipation effect during the ship exhaust process, reducing the heat energy transferred from the exhaust pipe to the hull, and avoiding problems such as paint peeling and aging of the hull caused by heat.
[0034] Furthermore, a refrigeration system is also included. The cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then introduced into the chamber.
[0035] As can be seen from the above description, seawater can be used for refrigeration in a way that suits local conditions, and the seawater after the cooling operation is directly discharged into the ocean, reducing the energy consumption during the refrigeration process, and being energy-saving and environmentally friendly.
[0036] Furthermore, a seat plate is also included. The seat plate is welded to the inner wall of the outer hull plate, the exhaust pipe is locked to the seat plate, and the seat plate has an opening corresponding to the exhaust port on the outer hull plate.
[0037] As can be seen from the above description, the exhaust pipe is indirectly connected to the hull plate through the seat plate, further reducing the heat conduction ability between the exhaust pipe and the hull plate, playing a certain protective role for the hull plate, avoiding paint peeling and aging due to heat, and improving the stability of the installation structure.
[0038] Please refer to Figure 1 and Figure 2As shown in the figure, Embodiment 1 of the present invention is: a cooling structure, including an exhaust pipe 1 and a cooling housing 2. The materials of the exhaust pipe 1 and the cooling housing 2 are both steel. The exhaust pipe 1 is a seamless steel pipe with a size of φ219×13 - 321, and the specification of the cooling housing 2 is φ273×9 - 200. The cooling housing 2 covers the outer wall of the exhaust pipe 1, and a cooling medium is passed through the chamber formed by the inner wall of the cooling housing 2 and the outer wall of the exhaust pipe 1. The pipe wall of the exhaust pipe 1 is provided with through holes 11, and both ends of the through holes 11 are respectively communicated with the inner cavity of the exhaust pipe 1 and the chamber. The through holes 11 are inclined, and there is an included angle between the opening direction of the through holes 11 and the diameter of the exhaust pipe 1. The included angle between the through holes 11 and the exhaust pipe 1 changes periodically along the axial direction of the exhaust pipe 1, and the range of the included angle is 5° to 15°. According to the installation method of the exhaust pipe 1, the structure of the through holes 11 should also be adjusted adaptively. The aperture of the through holes 11 at a lower horizontal height should be smaller than that of the through holes 11 at a higher horizontal height, so as to ensure the uniform flux of the through holes 11 in the circumferential direction. The cooling housing 2 is arranged along the circumferential direction of the exhaust pipe 1, and two or more of the through holes 11 are evenly distributed along the circumferential direction of the exhaust pipe 1 on the pipe wall, and two or more of the through holes 11 are arranged at intervals along the generatrix of the exhaust pipe 1 on the pipe wall. The number of the through holes 11 arranged at intervals along the generatrix of the exhaust pipe 1 is 4 in this embodiment, the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust pipe 1 is 20 mm in this embodiment, and the number of the through holes 11 arranged at intervals along the circumferential direction of the exhaust pipe 1 is 8 in this embodiment. The aperture of the through holes 11 is 5 mm in this embodiment. The side wall of the cooling housing 2 is provided with a cooling medium inlet, and the flux of the cooling medium inlet is greater than the sum of the fluxes of all the through holes 11. The cooling housing 2 is provided with an extension pipe at the cooling medium inlet along the direction tangent to the pipe wall of the exhaust pipe 1, which helps the cooling medium to generate a swirl in the cooling chamber, with a longer cooling time and better heat exchange effect. The end of the extension pipe is provided with a pipe flange. The specification of the extension pipe is φ76×8. The material of the pipe flange is DN65 - PN6RF (Series II) GB9119 - 2000. The cross-sectional shapes of the pipe wall of the exhaust pipe 1 and the inner wall of the cooling housing 2 are both circular. Both ends of the exhaust pipe 1 are provided with exhaust pipe flanges, and the total axial length of the exhaust pipe 1 is 341 mm. The distance from one end of the cooling housing 2 to one end of the exhaust pipe 1 is 70 mm, and the distance from the other end of the cooling housing 2 to the other end of the exhaust pipe 1 is 71 mm. The material of the exhaust pipe flange is DN200 - PN6RF (Series II) GB9119 - 2000. The total length of the projection of the cooling housing 2 on the axis of the exhaust pipe 1 is 200 mm. The exhaust pipe 1 and the cooling housing 2 are welded and connected.The cooling housing 2 includes a sleeve and steel sealing plates. The sleeve is coaxially arranged around the exhaust duct 1, and both ends of the sleeve are connected to the outer wall of the exhaust duct 1 through two annular steel sealing plates respectively. The steel sealing plates are welded to the sleeve and the outer wall of the exhaust duct 1 respectively.
[0039] The exhaust duct 1 and the cooling housing 2 are prefabricated in an integral workshop. First, through holes 11 are machined on the exhaust duct 1, then the sleeve and the steel sealing plates are correspondingly installed on the outer wall of the exhaust duct 1 with the through holes 11 and welded, and finally the exhaust pipe flange and the connecting pipe flange are welded and installed.
[0040] Please refer to Figure 1 and Figure 2 As shown, the difference between the second embodiment and the first embodiment of the present invention is that: the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust duct 1 is 40 mm in this embodiment, and the number of the through holes 11 arranged at intervals along the circumferential direction of the exhaust duct 1 is 10 in this embodiment. The aperture of the through hole 11 is 10 mm in this embodiment.
[0041] Please refer to Figure 1 and Figure 2 As shown, the difference between the third embodiment and the first embodiment of the present invention is that: the distance between any two adjacent through holes 11 arranged at intervals along the generatrix of the exhaust duct 1 is 60 mm in this embodiment, and the number of the through holes 11 arranged at intervals along the circumferential direction of the exhaust duct 1 is 12 in this embodiment. The aperture of the through hole 11 is 15 mm in this embodiment.
[0042] Please refer to Figure 3 As shown, the fourth embodiment of the present invention is: a hull exhaust structure having the cooling structure described in the first, second or third embodiment, further including a main engine exhaust pipe 3 and a ship's side outer plate 4. Both ends of the exhaust duct 1 are respectively connected to the exhaust port of the main engine exhaust pipe 3 and the exhaust port of the ship's side outer plate 4. It further includes a refrigeration system, the cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then introduced into the chamber. It further includes a seat plate 5, the seat plate 5 is welded to the inner wall of the ship's side outer plate 4, the exhaust duct 1 is locked to the seat plate 5, and the seat plate 5 has an opening corresponding to the exhaust port of the ship's side outer plate 4. The diameter of the opening is 235 mm.
[0043] In summary, the present invention provides a cooling structure. The cooling housing is sleeved on the outer wall of the exhaust pipe, and a chamber for storing and circulating the cooling medium is formed between the inner wall of the cooling housing and the outer wall of the exhaust pipe. This enclosed cooling structure can prevent the temperature in the cabin from rising. Through holes are formed in the wall of the exhaust pipe to connect the chamber with the inner cavity of the exhaust pipe. The cooling medium in the chamber exchanges heat with the outer wall of the exhaust pipe, reducing the temperature of the outer wall of the exhaust pipe. Since the hot gas flow velocity in the exhaust pipe is high and the pressure is low, it is easy for the cooling medium to enter the inner cavity of the exhaust pipe through the through holes and exchange heat with the inner wall of the exhaust pipe, fully achieving the purpose of cooling by mixing water and gas, and having the advantages of energy conservation and consumption reduction. The structural design of using porous to introduce the cooling medium can improve the uniformity and efficiency of heat dissipation of the exhaust pipe, and prevent problems such as aging and carbon deposition caused by uneven wall temperature. Through experiments, it is measured that the through-hole arrangement structure within this range can fully achieve the heat exchange effect between the cooling medium and the pipe wall of the exhaust pipe and the hot gas in the exhaust pipe, and balance the load of the refrigeration system, achieving the purpose of energy conservation and consumption reduction. If the aperture of the through hole is designed too large, the heat exchange time of the cooling medium on the outer wall of the exhaust pipe will be correspondingly shortened, not only increasing energy consumption but also affecting the cooling effect of the exhaust pipe. If the aperture of the through hole is designed too small, it is not conducive to the cooling medium entering the inner cavity of the exhaust pipe, reducing the water-gas mixing effect of the cooling medium and the hot gas, and also resulting in the cooling effect being affected. The flux of the cooling medium inlet is designed to be greater than the total flux of the through holes, that is, to ensure that the cooling medium should fill the entire chamber and have a certain kinetic energy when passing through the through holes, so as to achieve better cooling of the side wall of the exhaust pipe and sufficient cooling by mixing water and vapor. The circular cross-section design increases the heat exchange area between the cooling medium and the exhaust pipe and can reduce the energy consumption generated during the cooling operation. The exhaust pipe and the cooling housing are connected by prefabricated welding and can be directly installed on the required equipment, reducing the difficulty of on-site installation and facilitating production improvement. The present invention also provides a hull exhaust structure. The inlet end of the exhaust pipe is connected to the main engine exhaust pipe, and the outlet end of the exhaust pipe is connected to the exhaust port on the outer plate of the ship's side. According to the working principle of the above cooling structure, the high-temperature gas generated by the main engine passes through the main engine exhaust pipe into the exhaust pipe, and then cools down to a low-temperature gas under the cooling action of the cooling structure. The low-temperature gas and the cooling medium are jointly discharged from the exhaust port on the outer plate of the ship's side, thereby improving the heat dissipation effect during the ship's exhaust process, reducing the heat energy transferred from the exhaust pipe to the hull, and avoiding problems such as paint peeling and aging of the hull caused by heat. The cooling water is used for refrigeration in a local conditions-adapted manner, and the cooling water after the cooling operation is directly discharged into the ocean, reducing the energy consumption during the refrigeration process, being energy-saving and environment-friendly. The exhaust pipe is indirectly connected to the ship's side plate through a seat plate, further reducing the heat conduction ability between the exhaust pipe and the ship's side plate, playing a certain protective role for the ship's side plate, avoiding its paint peeling and aging due to heat, and improving the stability of the installation structure.
[0044] The above are only embodiments of the present invention, and do not thereby limit the patent scope of the present invention. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the related technical fields, shall equally be included in the patent protection scope of the present invention.
Claims
1. A closed hull exhaust structure with cooling function, It is characterized in that Including main engine exhaust pipe, ship side outer plate, exhaust pipe and cooling shell; The cooling housing cover is arranged on the outer wall of the exhaust pipe, a cooling medium is passed through the chamber surrounded by the inner wall of the cooling housing and the outer wall of the exhaust pipe, a through hole is arranged on the pipe wall of the exhaust pipe, and two ends of the through hole are respectively connected with the inner cavity of the exhaust pipe and the chamber; Two or more through holes are arranged on the pipe wall along the generatrix of the exhaust pipe at intervals; the through holes are opened obliquely, and there is an angle between the opening direction of the through holes and the diameter of the exhaust pipe, and the size of the angle increases or decreases along the axial period of the exhaust pipe; The cooling shell is provided with an extended connecting pipe at the cooling medium inlet in a direction tangent to the pipe wall of the exhaust pipe; the side wall of the cooling shell is provided with a cooling medium inlet, and the flux of the cooling medium inlet is greater than the sum of the fluxes of all the through holes; The two ends of the exhaust pipe are respectively connected to the exhaust port of the main engine exhaust pipe and the exhaust port of the ship's side outer plate.
2. The closed hull exhaust structure with cooling function according to claim 1, It is characterized in that The spacing between any two adjacent through holes arranged along the busbar of the exhaust duct is in the range of 20 mm to 60 mm, and the number of the through holes arranged along the circumferential direction of the exhaust duct is 8 to 12.
3. The closed hull exhaust structure with cooling function according to claim 1, It is characterized in that The cross-sectional shape of the pipe wall of the exhaust pipe and the cross-sectional shape of the inner wall of the cooling shell are both circular.
4. The closed hull exhaust structure with cooling function according to claim 1, It is characterized in that The exhaust pipe and the cooling shell are connected by welding.
5. The closed hull exhaust structure with cooling function according to claim 1, It is characterized in that It also includes a refrigeration system, the cooling medium is cooling water, and the cooling water is cooled by the refrigeration system and then flows into the chamber.
6. The closed hull exhaust structure with cooling function according to claim 1, It is characterized in that It also includes a seat plate, which is welded to the inner wall of the ship's side outer plate, the exhaust pipe is locked with the seat plate, and the seat plate has an opening corresponding to the exhaust port of the ship's side outer plate.