Marine seawater cooling device

Abstract

The utility model provides a kind of marine seawater cooling device, including water pump, inlet pipeline, outlet pipeline and return pipeline, and water pump has water inlet and water outlet. The outlet of inlet pipeline is communicated with water inlet. The inlet of outlet pipeline is communicated with water outlet. The inlet of return pipeline is communicated with outlet pipeline, and the outlet of return pipeline is communicated with water inlet. Flow stabilizing pressure increasing valve is provided on return pipeline. Valve is provided on inlet pipeline and return pipeline, and valve is configured to automatically open or block inlet pipeline and return pipeline according to the flow of seawater. The marine seawater cooling device provided by the utility model can solve the problem of noise caused by unstable pressure during operation of the marine seawater cooling device, achieving the effect of reducing noise during operation of the marine seawater cooling device.

Description

Technical Field

[0001] This utility model relates to the field of marine seawater systems, and in particular to a marine seawater cooling device. Background Technology

[0002] Marine seawater cooling systems typically consist of a water pump and valves, with the pump supplying seawater. During operation, the pump operates at a lower pressure at the inlet and a higher pressure at the outlet. This excessively high negative pressure at the pump inlet leads to unstable seawater intake pressure, making the seawater prone to cavitation and consequently increasing noise. Utility Model Content

[0003] In view of the above problems, this utility model is proposed to provide a marine seawater cooling device that overcomes or at least partially solves the above problems.

[0004] One objective of this invention is to solve the noise problem caused by unstable pressure during the operation of marine seawater cooling devices, thereby reducing the noise level during operation.

[0005] Specifically, this utility model provides a marine seawater cooling device, comprising: A water pump having an inlet and an outlet; A water inlet pipe, the outlet of which is connected to the water inlet; A water outlet pipe, wherein the inlet of the water outlet pipe is connected to the water outlet; A return pipe, the inlet of which is connected to the outlet pipe, and the outlet of which is connected to the inlet; a flow stabilizing and pressure boosting valve is installed on the return pipe; Valves are installed on the inlet pipe and the return pipe, and the valves are configured to automatically open or close the inlet pipe and the return pipe according to the seawater flow rate.

[0006] Optionally, the valve includes: A first door panel, the first door panel being used to open or block the water inlet pipe; The second door panel is used to open or block the return pipe; A connecting part connects the first door panel and the second door panel; the connecting part is rotatably mounted on the water inlet pipe and / or the return pipe. The valve has a first position in which the inlet pipe is fully open and the return pipe is fully blocked, and a second position in which the inlet pipe is fully blocked and the return pipe is fully open.

[0007] Optionally, the return pipe includes: The first reflux section has its inlet connected to the outlet pipe; The second recirculation section has its outlet connected to the inlet, and the flow stabilizing and pressure boosting valve is located in the second recirculation section. A booster section is connected between the first recirculation section and the second recirculation section. The inlet end of the booster section is connected to the outlet end of the first recirculation section. The inner surface of the booster section gradually narrows from the inlet end to the outlet end.

[0008] Optionally, the marine seawater cooling device further includes: An expansion pipe is connected to the inlet of the water pump, and the outlet of the inlet pipe and the outlet of the return pipe extend into the expansion pipe.

[0009] Optionally, the expansion tube includes: Expansion segment; A first outlet section is connected to the expansion section; A second outlet section is located at the end of the first outlet section that is furthest from the expansion section; The inner surface of the first outlet section tapers away from the expansion section.

[0010] Optionally, the expansion tube is provided with a groove, the opening of which faces outward; An outer shell is provided on the outside of the expansion tube, and the outer shell covers the groove opening of the groove to define a sound-absorbing cavity with the expansion tube; the sound-absorbing cavity is filled with sound-absorbing material. The groove has sound-absorbing micropores on its bottom.

[0011] Optionally, the sound-absorbing material is glass wool and / or epoxy putty.

[0012] Optionally, the marine seawater cooling device further includes: A throttling device is provided on the inlet pipe and the return pipe.

[0013] Optionally, the throttling device includes: The throttling orifice is provided on both the inlet pipe and the return pipe. The throttling orifice is located on the pipe wall of the inlet pipe and the return pipe and is evenly distributed around the inlet pipe and the return pipe. The throttling orifice is located inside the expansion pipe.

[0014] Optionally, the ends of the inlet pipe and the outlet pipe located inside the expansion pipe are provided with sealing plates, the sealing plates being curved and smoothly transitioning to the pipe wall.

[0015] This utility model discloses a marine seawater cooling device, which includes a water pump, an inlet pipe, an outlet pipe, a return pipe, and valves. The outlet of the water pump is connected to the inlet of the outlet pipe. The inlet of the return pipe is connected to the outlet pipe, and the outlets of both the inlet and return pipes are connected to the inlet of the water pump. A flow-stabilizing and pressure-boosting valve is installed on the return pipe. The valve controls the flow rate of the water inlet and return pipes. When the marine seawater cooling device is running, if the inlet pressure of the water pump is low, the flow-stabilizing and pressure-boosting valve increases the flow rate in the return pipe, and the valve increases the opening degree of the return pipe according to the flow rate, thereby increasing the pressure at the water pump inlet. When the inlet pressure of the water pump is high, the flow-stabilizing and pressure-boosting valve decreases the flow rate in the return pipe, and the valve decreases the opening degree of the return pipe according to the flow rate, thereby decreasing the pressure at the water pump inlet. By setting up the return pipe and the flow-stabilizing and pressure-boosting valve, the pressure at the water pump inlet is adjusted, avoiding cavitation caused by unstable pressure at the water pump inlet, thereby reducing the noise during the operation of the marine seawater cooling device.

[0016] Furthermore, the pressure-boosting valve can prevent the pressure at the pump inlet from being too high or too low, thereby protecting the pump from damage, helping to extend the pump's service life, and reducing maintenance costs.

[0017] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of a marine seawater cooling device according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic partial structural diagram at point A in the middle; Figure 3 This is a schematic structural diagram of an expansion tube according to an embodiment of the present invention. Detailed Implementation

[0019] The following reference Figures 1 to 3This invention describes a marine seawater cooling device according to an embodiment of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0020] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] Figure 1 This is a schematic structural diagram of a marine seawater cooling device according to an embodiment of the present invention, as shown below. Figure 1As shown, and refer to Figure 2 and Figure 3 This utility model provides a marine seawater cooling device 100, including a water pump 10, an inlet pipe 210, an outlet pipe 220, and a return pipe 230. The water pump 10 has an inlet 110 and an outlet 120. The outlet of the inlet pipe 210 is connected to the inlet 110. The inlet of the outlet pipe 220 is connected to the outlet 120. The inlet of the return pipe 230 is connected to the outlet pipe 220, and the outlet of the return pipe 230 is connected to the inlet 110. A flow stabilizing and pressure boosting valve 30 is provided on the return pipe 230. Valves 40 are provided on the inlet pipe 210 and the return pipe 230, and the valves 40 are configured to automatically open or close the inlet pipe 210 and the return pipe 230 according to the seawater flow rate.

[0024] In this embodiment, the marine seawater cooling device 100 includes a water pump 10, an inlet pipe 210, an outlet pipe 220, a return pipe 230, and a valve 40. The outlet 120 of the water pump 10 is connected to the inlet 110 of the outlet pipe 220. The inlet end of the return pipe 230 is connected to the outlet pipe 220, and the outlets of the inlet pipe 210 and the return pipe 230 are connected to the inlet 110 of the water pump 10. A flow-stabilizing and pressure-boosting valve 30 is installed on the return pipe 230. The valve 40 is used to control the flow rate of the water inlet pipe 210 and the return pipe 230. When the marine seawater cooling device 100 is running, if the inlet pressure of the water pump 10 is low, the flow-stabilizing and pressure-boosting valve 30 increases the flow rate in the return pipe 230, and the valve 40 increases the opening degree of the return pipe 230 according to the flow rate, thereby increasing the pressure at the inlet of the water pump 10. When the pressure at the inlet of water pump 10 is high, the flow stabilizing and pressure boosting valve 30 reduces the flow rate in the return pipe 230, and valve 40 reduces the opening degree of the return pipe 230 according to the flow rate, thereby reducing the pressure at the inlet of water pump 10. By configuring the return pipe 230 and the flow stabilizing and pressure boosting valve 30, the pressure at the inlet of water pump 10 is adjusted to avoid cavitation caused by unstable pressure at the inlet of water pump 10, thereby reducing the noise during operation of the marine seawater cooling device 100.

[0025] Furthermore, the flow-stabilizing and pressure-boosting valve 30 can prevent the pressure at the inlet of the water pump 10 from being too high or too low, thereby protecting the water pump 10 from damage, helping to extend the service life of the water pump 10, and reducing maintenance costs.

[0026] In some embodiments of this utility model, such as Figure 2As shown, valve 40 includes a first door plate 410, a second door plate 420, and a connecting portion 430. The first door plate 410 is used to open or block the inlet pipe 210. The second door plate 420 is used to open or block the return pipe 230. The connecting portion 430 connects the first door plate 410 and the second door plate 420. The connecting portion 430 is rotatably mounted on the inlet pipe 210 and / or the return pipe 230. Valve 40 has a first position in which the inlet pipe 210 is fully open and the return pipe 230 is fully blocked, and a second position in which the inlet pipe 210 is fully blocked and the return pipe 230 is fully open.

[0027] In this embodiment, valve 40 includes a first door plate 410, a second door plate 420, and a connecting portion 430, with the first door plate 410 and the second door plate 420 connected by the connecting portion 430. The connecting plate is rotatably mounted on the inlet pipe 210. Valve 40 has a first position and a second position. When valve 40 is in the first position, the first door plate 410 fully opens the inlet pipe 210, and the second door plate 420 fully blocks the return pipe 230. When valve 40 is in the second position, the first door plate 410 fully blocks the inlet pipe 210, and the second door plate 420 fully opens the return pipe 230. The first and second positions represent two extreme rotational positions of valve 40. Between the two extreme positions, valve 40 simultaneously opens the inlet pipe 210 and the return pipe 230. Because valve 40 is rotatably connected, when the flow rate of return pipe 230 increases, the degree to which the second gate plate 420 opens return pipe 230 increases, and correspondingly, the degree to which the first gate plate 410 opens inlet pipe 210 decreases. When the flow rate of return pipe 230 decreases, the degree to which the second gate plate 420 opens return pipe 230 decreases, and correspondingly, the degree to which the first gate plate 410 opens inlet pipe 210 increases. Valve 40 can control the opening degree of inlet pipe 210 and return pipe 230 according to seawater flow rate, realizing automatic opening or blocking of inlet pipe 210 and return pipe 230 according to seawater flow rate. Valve 40 has a simple structure, and the method for controlling the outflow of water from inlet pipe 210 and return pipe 230 is simple and convenient.

[0028] In some other embodiments of this utility model, a rotating shaft is provided on the water inlet pipe 210, and the connecting part 430 is rotatably connected to the rotating shaft. The rotating shaft can also be provided on the return pipe 230, or the rotating shaft can be provided on both the water inlet pipe 210 and the return pipe 230.

[0029] In some embodiments of this utility model, such as Figure 1As shown, the return pipe 230 includes a first return section 231, a second return section 232, and a pressurization section 233. The inlet of the first return section 231 is connected to the outlet pipe 220. The outlet of the second return section 232 is connected to the inlet 110, and a flow-stabilizing and pressurizing valve 30 is installed in the second return section 232. The pressurization section 233 is connected between the first return section 231 and the second return section 232. The inlet end of the pressurization section 233 is connected to the outlet end of the first return section 231. From the inlet end to the outlet end of the pressurization section 233, the inner surface of the pressurization section 233 gradually narrows.

[0030] In this embodiment, the return pipe 230 includes a first return section 231, a second return section 232, and a pressurization section 233. Following the flow direction of the coastal water, the first return section 231, the pressurization section 233, and the second return section 232 are sequentially connected. The pressurization section 233 is configured to reduce the flow direction of the coastal water. When seawater returns, after flowing out of the outlet pipe 220, some of the seawater flows into the first return section 231. After passing through the pressurization section 233, the pressure of the seawater increases. After the pressure is stabilized by the flow-stabilizing and pressurizing valve 30, the seawater enters the water pump 10 through the second return section 232. The pressurization section 233 increases the pressure of the seawater in the return pipe 230, thereby increasing the pressure at the inlet of the water pump 10. This prevents cavitation caused by low pressure at the inlet of the water pump 10 and reduces the noise during operation of the marine seawater cooling device 100.

[0031] In some embodiments of this utility model, such as Figure 1 As shown, the marine seawater cooling device 100 also includes an expansion pipe 50, which is connected to the inlet of the water pump 10. The outlet of the water inlet pipe 210 and the outlet of the return pipe 230 extend into the expansion pipe 50.

[0032] In this embodiment, the marine seawater cooling device 100 further includes an expansion pipe 50. The outlets of the inlet pipe 210 and the return pipe 230 extend into the expansion pipe 50, and the other end of the expansion pipe is connected to the inlet 110 of the water pump 10. After the seawater flows out of the inlet pipe 210 and the return pipe 230, it enters the expansion pipe 50, where the flow velocity decreases and the pressure gradually returns to normal levels. This prevents air bubbles in the seawater from suddenly bursting in the high-pressure area, thereby reducing noise generation. Furthermore, the reduced seawater flow velocity reduces the generation of turbulence and eddies, making the seawater flow more stable and preventing pressure fluctuations at the inlet of the water pump 10, thus reducing the noise during operation of the marine seawater cooling device 100.

[0033] In some embodiments of this utility model, such as Figure 3As shown, the expansion tube 50 includes an expansion section 510, a first outlet section 520, and a second outlet section 530, with the first outlet section 520 connected to the expansion section 510. The second outlet section 530 is located at the end of the first outlet section 520 away from the expansion section 510. The inner surface of the first outlet section 520 tapers in the direction away from the expansion section 510.

[0034] In this embodiment, the expansion pipe 50 includes an expansion section 510, a first outlet section 520, and a second outlet section 530, with the first outlet section 520 located between the expansion section 510 and the second outlet section 530. Following the flow direction of coastal water, the inner surface of the first outlet section 520 gradually narrows. When seawater flows to the first outlet section 520, due to the narrowing of the first outlet section 520, the seawater flows more stably along the wall of the first outlet section 520 to the second inlet section, reducing turbulence and eddies, thereby reducing the noise of the marine seawater cooling device 100.

[0035] In some embodiments of this utility model, such as Figure 3 As shown, the expansion tube 50 has a groove with the groove opening facing outwards. An outer shell 60 is provided on the outside of the expansion tube 50, covering the groove opening to define a sound-absorbing cavity, which is filled with sound-absorbing material 70. Sound-absorbing micropores 550 are provided on the bottom of the groove.

[0036] In this embodiment, the expansion tube 50 is provided with a groove, and the silencing cavity is defined by the groove wall and the outer shell 60 located outside the groove. The silencing cavity is filled with silencing material 70. The bottom of the groove is provided with silencing micropores 550. When the noise generated by the seawater flow passes through the silencing micropores 550, the noise energy is converted into heat energy, thereby reducing the noise of the seawater flow. After the seawater enters the expansion section 510, the generated noise enters the silencing cavity through the silencing micropores 550. When the sound wave of the seawater flow noise is consistent with the natural frequency of the silencing cavity, it resonates within the silencing cavity, thereby reducing the noise of the seawater flow.

[0037] Furthermore, the silencing cavity is filled with silencing material 70. When noise generated by the seawater flow propagates to the silencing material 70, the silencing material 70 absorbs and disperses the noise, reducing noise reflection and propagation, thereby reducing noise.

[0038] In some embodiments of this utility model, the sound-absorbing material 70 is glass wool and / or epoxy putty.

[0039] In this embodiment, the sound-absorbing material 70 is glass wool. Alternatively, the sound-absorbing material 70 is epoxy putty. Alternatively, the sound-absorbing material 70 is a combination of glass wool and epoxy putty. Epoxy putty has good flexibility; when noise propagates to its surface, the epoxy putty can deform, converting the noise into heat energy and dissipating it, thereby achieving sound absorption and noise reduction. Furthermore, epoxy putty also has good impact resistance, capable of absorbing noise generated by seawater impact and mechanical vibration of the marine seawater cooling device 100, thereby reducing noise caused by seawater impact and mechanical vibration.

[0040] Furthermore, glass wool has a porous structure and a rough surface. When noise travels to the glass wool, it is constantly reflected, refracted, and diffused within the pores, causing the noise energy to gradually decrease, thus achieving a noise reduction effect.

[0041] In some embodiments of this utility model, the marine seawater cooling device 100 further includes a throttling device, which is disposed on the inlet pipe 210 and the outlet pipe 220.

[0042] In this embodiment, throttling devices are installed on the inlet pipe 210 and the return pipe 230. When seawater flows through the throttling device, the flow rate of seawater increases and the pressure decreases. The pressure of seawater is not easily lower than the saturated vapor pressure, the number of bubbles generated is relatively small, and the impact pressure generated when the bubbles burst is also small, thereby reducing the noise generated by cavitation and thus reducing the noise of the marine seawater cooling device 100 during operation.

[0043] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the throttling device includes a throttling orifice 810. The inlet pipe 210 and the return pipe 230 are both provided with throttling orifices 810. The throttling orifices 810 are provided on the pipe walls of the inlet pipe 210 and the return pipe 230. The throttling orifices 810 are evenly distributed around the inlet pipe 210 and the return pipe 230. The throttling orifices 810 are located inside the expansion pipe 50.

[0044] In this embodiment, the throttling device includes throttling orifices 810, which are uniformly disposed on the pipe walls of the inlet pipe 210 and the return pipe 230. When water flows through the throttling orifices 810, the flow velocity increases and the pressure decreases. The pressure of the water flow is less likely to fall below the saturated vapor pressure, resulting in a relatively small number of bubbles generated. The impact pressure generated when the bubbles burst is also small, thereby reducing the noise generated by cavitation and thus reducing the noise of the marine seawater cooling device 100 during operation.

[0045] In some embodiments of this utility model, such as Figure 1As shown, the ends of the inlet pipe 210 and the outlet pipe 220 within the expansion pipe 50 are provided with sealing plates 820. The sealing plates 820 are curved and have a smooth transition with the pipe wall.

[0046] In this embodiment, sealing plates 820 are provided at the ends of the inlet pipe 210 and outlet pipe 220 within the expansion pipe 50. The sealing plates 820 are curved. Seawater flows along the pipe walls within the inlet pipe 210 and return pipe 230. Part of the seawater enters the expansion pipe 50 through the throttling orifice 810, while the other part continues to flow along the pipe wall to the sealing plate 820 and flows along the wall surface of the sealing plate 820. Because the sealing plate 820 is curved and has a smooth transition with the pipe wall, the turbulence and impact force of the water flow are reduced, thereby reducing the noise generated by the impact of the water flow and improving the noise reduction effect of the marine seawater cooling device 100.

[0047] Furthermore, the throttling orifice 810 is set on the pipe wall, and the seawater flows along the pipe wall, reducing the noise generated by the collision between the seawater and the sealing plate 820.

[0048] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A marine seawater cooling device, characterized in that, include: A water pump having an inlet and an outlet; A water inlet pipe, the outlet of which is connected to the water inlet; A water outlet pipe, wherein the inlet of the water outlet pipe is connected to the water outlet; A return pipe, the inlet of which is connected to the outlet pipe, and the outlet of which is connected to the inlet; a flow stabilizing and pressure boosting valve is installed on the return pipe; Valves are installed on the inlet pipe and the return pipe, and the valves are configured to automatically open or close the inlet pipe and the return pipe according to the seawater flow rate.

2. The marine seawater cooling device according to claim 1, characterized in that, The valve includes: A first door panel, the first door panel being used to open or block the water inlet pipe; The second door panel is used to open or block the return pipe; A connecting part connects the first door panel and the second door panel; the connecting part is rotatably mounted on the water inlet pipe and / or the return pipe. The valve has a first position in which the inlet pipe is fully open and the return pipe is fully blocked, and a second position in which the inlet pipe is fully blocked and the return pipe is fully open.

3. The marine seawater cooling device according to claim 1, characterized in that, The return pipe includes: The first reflux section has its inlet connected to the outlet pipe; The second recirculation section has its outlet connected to the inlet, and the flow stabilizing and pressure boosting valve is located in the second recirculation section. A booster section is connected between the first recirculation section and the second recirculation section. The inlet end of the booster section is connected to the outlet end of the first recirculation section. The inner surface of the booster section gradually narrows from the inlet end to the outlet end.

4. The marine seawater cooling device according to claim 1, characterized in that, Also includes: An expansion pipe is connected to the inlet of the water pump, and the outlet of the inlet pipe and the outlet of the return pipe extend into the expansion pipe.

5. The marine seawater cooling device according to claim 4, characterized in that, The expansion tube includes: Expansion segment; A first outlet section is connected to the expansion section; A second outlet section is located at the end of the first outlet section that is furthest from the expansion section; The inner surface of the first outlet section tapers away from the expansion section.

6. The marine seawater cooling device according to claim 4, characterized in that, The expansion tube is provided with a groove, and the opening of the groove faces outward; An outer shell is provided on the outside of the expansion tube, and the outer shell covers the groove opening of the groove to define a sound-absorbing cavity with the expansion tube; the sound-absorbing cavity is filled with sound-absorbing material. The groove has sound-absorbing micropores on its bottom.

7. The marine seawater cooling device according to claim 6, characterized in that, The sound-absorbing material is glass wool and / or epoxy putty.

8. The marine seawater cooling device according to claim 4, characterized in that, Also includes: A throttling device is provided on the inlet pipe and the return pipe.

9. The marine seawater cooling device according to claim 8, characterized in that, The throttling device includes: The throttling orifice is provided on both the inlet pipe and the return pipe. The throttling orifice is located on the pipe wall of the inlet pipe and the return pipe and is evenly distributed around the inlet pipe and the return pipe. The throttling orifice is located inside the expansion pipe.

10. The marine seawater cooling device according to claim 9, characterized in that, The inlet pipe and the outlet pipe are provided with sealing plates at their ends inside the expansion pipe. The sealing plates are curved and have a smooth transition with the pipe wall.

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