Lubricating oil heat exchanger and ship cooling system

Abstract

The invention relates to the technical field of cooling systems, and provides a lubricating oil heat exchanger and a ship cooling system. The lubricating oil heat exchanger comprises a shell, a self-excitation pipe, a cyclone separator and an air escape pipe, one end of the shell is connected with a first inlet sealing head; part of the self-excitation pipe extends into the first inlet end socket, part of the self-excitation pipe expands outwards to form an expansion part, and a self-excitation cavity is formed in the expansion part; the cyclone separator is arranged in the first inlet seal head and is connected with the self-excitation pipe; and the gas escape pipe is connected with the cyclone separator and extends out of the first inlet seal head. According to the lubricating oil heat exchanger, when an oil-gas mixture passes through the self-excitation pipe, the volume of gas bubbles in the oil-gas mixture can be reduced, so that when the oil-gas mixture passes through the cyclone separator, under the action of rotational flow, the bubbles are separated out and discharged along the gas escape pipe, and the influence of bubble collapse on the lubricating oil heat exchanger is avoided; safe and reliable operation of the lubricating oil heat exchanger is guaranteed, and the service life of the lubricating oil heat exchanger is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems, and in particular to a lubricating oil heat exchanger and a ship cooling system. Background Art

[0002] A ship's cooling system is a crucial support system for its power system. It ensures that the temperature of each component is maintained near the set point, ensuring safe and stable operation. Ambient seawater serves as the ultimate heat sink for the ship's cooling system. The ship's cooling system consists of a seawater circuit and a freshwater circuit. Heat is exchanged between the ambient seawater and the intermediate freshwater circuit via a central cooler. This corrosion-resistant system, which prevents pressurized seawater from directly contacting the heat exchangers, effectively improves their reliability and lifespan. It is currently the predominant form of ship cooling system.

[0003] An oil heat exchanger is a heat exchange device used to regulate lubricating oil temperature. Its core function is to maintain the lubricating oil temperature within the appropriate operating range by exchanging heat with other media (such as water, air, or refrigerant). During operation, air and oil mix, easily forming cavitation. The collapse of cavitation can easily affect the service life of the oil heat exchanger. Summary of the Invention

[0004] The present invention provides a lubricating oil heat exchanger and a ship cooling system, which are used to solve the defect in the prior art that cavitation collapse affects the lubricating oil heat exchanger during operation.

[0005] The present invention provides a lubricating oil heat exchanger, comprising: a shell, one end of which is connected to a first inlet head; a self-exciting tube, part of which extends into the first inlet head, part of which expands outward to form an expansion portion, and the interior of the expansion portion forms a self-exciting cavity; a cyclone separator, which is arranged in the first inlet head and connected to the self-exciting tube; and an exhaust pipe, which is connected to the cyclone separator and extends to the outside of the first inlet head.

[0006] According to the present invention, a lubricating oil heat exchanger further includes a plurality of separation plates, which are staggeredly arranged on opposite inner walls of the exhaust pipe, and one end of each separation plate is a free end.

[0007] According to the lubricating oil heat exchanger provided by the present invention, each of the separation plates is arranged obliquely relative to the air escape pipe, and a plurality of the separation plates are arranged in parallel.

[0008] According to the lubricating oil heat exchanger provided by the present invention, the outer shape of the separation plate is rectangular, wavy or fan-shaped.

[0009] According to a lubricating oil heat exchanger provided by the present invention, the self-excited tube includes: a first pipeline, the two ends of the first pipeline are respectively connected to the cyclone separator and one end of the expansion part; a second pipeline is connected to the other end of the expansion part; wherein the diameter of the first pipeline is larger than the diameter of the second pipeline.

[0010] According to a lubricating oil heat exchanger provided by the present invention, one end of the expansion portion has a first plate body, the first plate body is connected to the first pipeline at an angle, the first plate body is provided with a first through hole, and the first through hole is connected to the first pipeline.

[0011] According to the lubricating oil heat exchanger provided by the present invention, the ratio of the diameter of the second pipeline to the diameter of the first pipeline is in the range of 2-3.

[0012] According to the lubricating oil heat exchanger provided by the present invention, the ratio of the diameter of the self-exciting cavity to the diameter of the first pipeline is in the range of 4-6.

[0013] According to the lubricating oil heat exchanger provided by the present invention, the ratio of the diameter of the self-exciting cavity to the length of the self-exciting cavity is in the range of 1.5-2.

[0014] The present invention also provides a ship cooling system, comprising a central heat exchanger and the lubricating oil heat exchanger as described above, wherein the central heat exchanger is thermally coupled to the lubricating oil heat exchanger.

[0015] The lubricating oil heat exchanger provided by the present invention is equipped with a self-exciting tube, a cyclone separator and an escape pipe. When the oil-gas mixture passes through the self-exciting tube, the volume of the gas bubbles in the oil-gas mixture can be reduced. Therefore, when the oil-gas mixture passes through the cyclone separator, the bubbles are separated under the action of the swirling flow and discharged along the escape pipe, thereby avoiding the impact of the bubble collapse on the lubricating oil heat exchanger, ensuring the safe and reliable operation of the lubricating oil heat exchanger, and improving the service life of the lubricating oil heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is one of the structural schematic diagrams of the lubricating oil heat exchanger provided by the present invention.

[0018] Figure 2 This is the second structural schematic diagram of the lubricating oil heat exchanger provided by the present invention.

[0019] Reference numerals: 10. Shell; 11. First inlet head; 12. First outlet head; 13. Third pipeline; 14. Second inlet head; 15. Fourth pipeline; 16. Second outlet head; 17. Fifth pipeline; 20. Self-excited tube; 21. First pipeline; 22. Expansion section; 23. Second pipeline; 30. Cyclone separator; 40. Escape tube; 50. Separation plate; 221. First plate; 222. Self-excited chamber; 223. Second plate. DETAILED DESCRIPTION

[0020] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0022] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0023] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0024] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0025] The following combination Figure 1 and Figure 2 The lubricating oil heat exchanger and the ship cooling system of the present invention are described.

[0026] like Figure 1 and Figure 2 As shown, in an embodiment of the present invention, the lubricating oil heat exchanger includes: a shell 10, a first inlet head 11, a self-exciting pipe 20, a cyclone separator 30 and an exhaust pipe 40. One end of the shell 10 is connected to the first inlet head 11, a portion of the self-exciting pipe 20 extends into the first inlet head 11, a portion of the self-exciting pipe 20 expands outward to form an expansion portion 22, and the interior of the expansion portion 22 forms a self-exciting cavity 222. The cyclone separator 30 is arranged in the first inlet head 11 and is connected to the self-exciting pipe 20. The exhaust pipe 40 is connected to the cyclone separator 30 and extends to the outside of the first inlet head 11.

[0027] Specifically, in this embodiment, a first inlet head 11 and a first outlet head 12 are connected to both ends of the shell 10, respectively. The first outlet head 12 is connected to the third pipeline 13. A second inlet head 14 and a second outlet head 16 are also provided on both sides of the shell 10. The second inlet head 14 is connected to the fourth pipeline 15, and the second outlet head 16 is connected to the fifth pipeline 17. Multiple first heat exchange plates and multiple second heat exchange plates are arranged in an alternating stack within the shell 10. Each layer of heat exchange plates is provided with multiple flow channels.

[0028] Part of the self-excitation tube 20 extends into the first inlet head 11 and is connected to the cyclone separator 30. After the oil-gas mixture passes through the self-excitation tube 20 and the cyclone separator 30 to separate the bubbles in the lubricating oil, the lubricating oil enters the first heat exchange plate and flows along the flow channel on the first heat exchange plate. The cooling medium enters the second heat exchange plate through the fourth pipeline 15 and the second inlet head 14 and flows along the flow channel on the second heat exchange plate. Heat exchange occurs between the lubricating oil and the cooling medium during the flow process, and the lubricating oil with reduced temperature flows out through the first outlet head 12 and the third pipeline 13. The cooling medium that absorbs heat flows out of the lubricating oil heat exchanger through the second outlet head 16 and the fifth pipeline 17.

[0029] In existing technologies, during the operation of lubricating oil heat exchangers, vortices of specific frequencies form self-excited pulsed jets. When the pulse occurs, the jet pressure rises sharply in an extremely short period of time, forming a localized high-pressure peak. After the high-pressure pulse ends, the lubricating oil pressure quickly recovers, and the bubbles collapse violently in an extremely short period of time, generating extremely high local temperatures and pressures. The high temperature (thermal effect) and high pressure (mechanical effect) can trigger phase changes in the material, such as metal melting, which can affect the lubricating oil heat exchanger.

[0030] In this embodiment, when the oil-gas mixture flows through the self-exciting tube 20 and enters the self-exciting chamber 222 of the expansion portion 22, the volume of the self-exciting chamber 222 increases, the local pressure decreases, and the volume of the gas bubbles in the oil-gas mixture decreases. After the oil-gas mixture enters the cyclone separator 30, the swirling flow causes the bubbles to converge toward the center and flow along the gas escape pipe 40, where they are discharged. This separates the oil and gas, preventing the impact of bubble collapse on the lubricating oil heat exchanger.

[0031] Optionally, in an embodiment of the present invention, the self-excitation tube 20 can be a whole, and an expansion portion 22 is formed in the middle of the self-excitation tube 20. The diameter of the expansion portion 22 is larger than the diameter of the tube body at both ends. When the oil-gas mixture enters the self-excitation cavity 222 of the expansion portion 22, the space of the self-excitation cavity 222 becomes larger and the local pressure decreases, thereby reducing the volume of the gas bubbles in the oil-gas mixture. When the oil-gas mixture enters the cyclone separator 30, the bubbles can be easily separated.

[0032] In another embodiment of the present invention, the self-exciting tube 20 may also be a split structure, such as the self-exciting tube 20 includes: two sections of tube bodies and a cylindrical part, the two ends of the cylindrical part respectively have a bottom, and the bottom is provided with a through hole, the two bottoms are respectively connected to the two sections of the tube body, and the through hole is connected to the two sections of the tube body.

[0033] Optionally, the expansion portion 22 of the self-exciting tube 20 may be located inside or outside the first inlet header 11. In this embodiment, the expansion portion 22 is located outside the first inlet header 11 to reduce the volume of the lubricating oil heat exchanger.

[0034] The lubricating oil heat exchanger provided by the embodiment of the present invention, by providing a self-exciting tube, a cyclone separator and an escape pipe, can reduce the volume of gas bubbles in the oil-gas mixture when the oil-gas mixture passes through the self-exciting tube, so that when the oil-gas mixture passes through the cyclone separator, the bubbles are separated under the action of the swirling flow and discharged along the escape pipe, thereby avoiding the influence of bubble collapse on the lubricating oil heat exchanger, ensuring the safe and reliable operation of the lubricating oil heat exchanger, and improving the service life of the lubricating oil heat exchanger.

[0035] like Figure 2 As shown, in an embodiment of the present invention, the lubricating oil heat exchanger further includes a plurality of separation plates 50 , which are staggeredly arranged on opposite inner walls of the exhaust pipe 40 , and one end of each separation plate 50 is a free end.

[0036] Specifically, in this embodiment, one end of each separation plate 50 is connected to the inner wall of the exhaust pipe 40, and the other end is a free end. Multiple separation plates 50 are staggered on the opposite inner walls of the exhaust pipe 40, and the gap between two adjacent separation plates 50 forms a flow channel for bubbles. After the oil-gas mixture enters the cyclone separator 30, under the action of the swirl, the bubbles gather toward the center and flow along the exhaust pipe 40. Under the action of the swirl, some oil droplets will also flow into the exhaust pipe 40 and be carried out of the lubricating oil heat exchanger by the bubbles. To avoid this problem, multiple separation plates 50 are set on the opposite inner walls of the exhaust pipe 40. When the oil droplets flow along the exhaust pipe 40, they are blocked by the separation plates 50, re-enter the cyclone separator 30, and then enter the flow channel, ensuring that the lubricating oil in the lubricating oil heat exchanger is evenly distributed.

[0037] Furthermore, if Figure 2 As shown, in the embodiment of the present invention, each separation plate 50 is arranged obliquely relative to the gas escape pipe 40, and a plurality of separation plates 50 are arranged in parallel.

[0038] Specifically, in Figure 2 In the illustrated embodiment, the separator plate 50 located on the right side of the vent pipe 40 is tilted upward relative to the vent pipe 40, while the separator plate 50 located on the left side of the vent pipe 40 is tilted downward relative to the vent pipe 40. The tilted separator plates 50 are more effective in blocking oil droplets, allowing them to re-enter the cyclone separator 30.

[0039] It is understandable that in another embodiment of the present invention, the separation plate 50 located on the right side of the exhaust pipe 40 can also be set to be tilted downward relative to the exhaust pipe 40, and the separation plate 50 located on the left side of the exhaust pipe 40 can also be set to be tilted upward relative to the exhaust pipe 40.

[0040] Furthermore, in embodiments of the present invention, the separation plate 50 can be shaped as a rectangular plate, a corrugated plate, or a fan-shaped plate. Specifically, a rectangular plate provides a simple structure and facilitates processing; a corrugated plate reduces gas resistance when passing through the plate, facilitating gas escape; and a fan-shaped plate further facilitates oil and gas separation, resulting in higher separation efficiency.

[0041] like Figure 1 As shown, in an embodiment of the present invention, the self-excited tube 20 includes a first pipe 21 and a second pipe 23. The first pipe 21 is connected to the cyclone separator 30 and one end of the expansion portion 22 at both ends, and the second pipe 23 is connected to the other end of the expansion portion 22. The diameter of the first pipe 21 is larger than that of the second pipe 23.

[0042] Specifically, in this embodiment, the diameter of the self-exciting chamber 222 of the expansion portion 22 is larger than the diameter of the first pipeline 21, and the diameter of the first pipeline 21 is larger than the diameter of the second pipeline 23. Therefore, after the oil-gas mixture passes through the second pipeline 23 and enters the self-exciting chamber 222, the volume of the self-exciting chamber 222 increases, and the local pressure of the oil-gas mixture decreases, which can make the volume of the originally large bubbles smaller, thereby facilitating the separation of the bubbles in the cyclone separator 30.

[0043] Optionally, in an embodiment of the present invention, taking into account fluid resistance and separation effect, the ratio of the diameter of the second pipeline 23 to the diameter of the first pipeline 21 is in a range of 2-3. The ratio of the diameter of the self-exciting chamber 222 to the length of the self-exciting chamber 222 is in a range of 1.5-2.0. The ratio of the diameter of the self-exciting chamber 222 to the diameter of the first pipeline 21 is in a range of 4-6.

[0044] like Figure 1 As shown, in an embodiment of the present invention, one end of the expansion portion 22 has a first plate 221 , the first plate 221 is connected to the first pipeline 21 at an angle, and the first plate 221 is provided with a first through hole, which is connected to the first pipeline 21 .

[0045] Specifically, the first plate 221 can be positioned perpendicular to the first pipeline 21, or it can be positioned at an angle relative to the first pipeline 21. When the first plate 221 is positioned at an angle relative to the first pipeline 21, the angle between the first plate 221 and the first pipeline 21 is greater than 30° but less than 90°. This angled positioning of the first plate 221 relative to the first pipeline 21 can enhance the agitation effect and improve the oil-gas separation effect.

[0046] Furthermore, the other end of the expansion portion 22 further has a second plate 223 , which is connected to the second pipeline 23 . The second plate 223 is provided with a second through hole, which is in communication with the second pipeline 23 .

[0047] An embodiment of the present invention further provides a ship cooling system, including a central heat exchanger and a lubricating oil heat exchanger, wherein the central heat exchanger is thermally coupled to the lubricating oil heat exchanger.

[0048] Specifically, after the cooling medium passes through the lubricating oil heat exchanger, it absorbs the heat of the lubricating oil in the lubricating oil heat exchanger. After that, the cooling medium enters the central heat exchanger. The central heat exchanger is provided with a seawater inlet and a seawater outlet. The seawater enters the central heat exchanger to exchange heat with the cooling medium, absorbs the heat of the cooling medium, and then flows out of the central heat exchanger.

[0049] The ship cooling system provided by the embodiment of the present invention solves the problem in existing ship cooling systems that the lubricating oil heat exchanger is easily affected by cavitation collapse by providing a lubricating oil heat exchanger, thereby improving the operational reliability and service life of the ship cooling system.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lubricating oil heat exchanger, characterized in that: include: a shell, one end of which is connected to a first inlet head; A self-exciting tube, wherein a portion of the self-exciting tube extends into the first inlet head, the portion of the self-exciting tube expands outward to form an expansion portion, and the interior of the expansion portion forms a self-exciting cavity; a cyclone separator, disposed in the first inlet header and connected to the self-exciting pipe; An air escape pipe is connected to the cyclone separator and extends to the outside of the first inlet head.

2. The lubricating oil heat exchanger according to claim 1, characterized in that: It also includes a plurality of separation plates, which are staggeredly arranged on opposite inner walls of the gas escape pipe, and one end of each separation plate is a free end.

3. The lubricating oil heat exchanger according to claim 2, characterized in that: Each of the separation plates is arranged obliquely relative to the air escape pipe, and a plurality of the separation plates are arranged in parallel.

4. The lubricating oil heat exchanger according to claim 2, characterized in that: The outer shape of the separation plate is rectangular, wavy or fan-shaped.

5. The lubricating oil heat exchanger according to claim 1, characterized in that: The self-excited tube includes: a first pipeline, wherein two ends of the first pipeline are respectively connected to the cyclone separator and one end of the expansion portion; a second pipeline connected to the other end of the expansion portion; Wherein, the diameter of the first pipeline is larger than the diameter of the second pipeline.

6. The lubricating oil heat exchanger according to claim 5, characterized in that: One end of the expansion portion has a first plate body, the first plate body is connected to the first pipeline at an angle, the first plate body is provided with a first through hole, and the first through hole is connected to the first pipeline.

7. The lubricating oil heat exchanger according to claim 5, characterized in that: The ratio of the diameter of the second pipeline to the diameter of the first pipeline is in the range of 2-3.

8. The lubricating oil heat exchanger according to claim 5, characterized in that: The ratio of the diameter of the self-exciting cavity to the diameter of the first pipeline is in the range of 4-6.

9. The lubricating oil heat exchanger according to claim 1, characterized in that: The ratio of the diameter of the self-exciting cavity to the length of the self-exciting cavity is in the range of 1.5-2.

10. A ship cooling system, characterized in that: The invention comprises a central heat exchanger and the lubricating oil heat exchanger according to any one of claims 1 to 9, wherein the central heat exchanger is thermally coupled to the lubricating oil heat exchanger.

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