Heat sink oil tank and underwater hydraulic station

Abstract

The application provides a heat dissipation oil tank and an underwater hydraulic station, and relates to the field of underwater hydraulic stations. The heat dissipation oil tank comprises an oil tank shell, a butt joint assembly and an end cover assembly which are arranged on two sides of the oil tank shell. An oil cavity is formed in the oil tank shell. An oil return channel which penetrates in the axial direction is arranged in the shell wall of the oil tank shell. An oil return inlet and an oil return outlet which are in communication with the oil cavity are arranged at the two axial ends of the oil tank shell. A first butt joint circuit is arranged in the butt joint assembly. The inlet end of the first butt joint circuit is in communication with the oil return outlet. The outlet end of the first butt joint circuit is in communication with the inlet end of the oil return channel. An oil return flow channel is arranged in the end cover assembly. The inlet end of the oil return flow channel is in communication with the outlet end of the oil return channel. The outlet end of the oil return flow channel is in communication with the oil return inlet. A heat dissipation circuit for cooling and circulating oil into the oil cavity is formed. High-temperature oil is fully heat-exchanged with external low-temperature seawater through the heat dissipation circuit with a long path, so that insufficient heat dissipation does not cause oil aging or component failure.

Description

Technical Field

[0001] This application relates to the field of underwater hydraulic station technology, and more particularly to a cooling oil tank and an underwater hydraulic station. Background Technology

[0002] Underwater hydraulic stations are the core power units of various underwater hydraulic operation equipment, mainly providing stable hydraulic power output for underwater robots, underwater hydraulic manipulators, seabed sampling equipment, etc. Specifically, existing underwater hydraulic stations mainly consist of underwater motors, hydraulic pumps, oil tanks, etc. The rotation of the underwater motor drives the hydraulic pump to draw oil from the oil tank, generating high-pressure oil under the action of the hydraulic pump.

[0003] Currently, the mainstream method for cooling the oil in underwater hydraulic stations is to rely on the direct contact between the oil tank shell and the external seawater, using natural convection to cool the high-temperature oil inside.

[0004] However, this passive cooling method has problems under certain operating conditions. On the one hand, the water temperature in shallow seas and nearshore waters is relatively high, resulting in a significant decrease in cooling efficiency. On the other hand, small underwater hydraulic stations, in order to reduce size and control costs, use fixed displacement pump structures such as gear pumps, which result in a large amount of overflow and throttling losses during operation, and the temperature rises rapidly even in deep-sea environments. However, dedicated underwater cooling equipment is usually large and complex in structure, which does not meet the installation requirements. Therefore, there is an urgent need for a compact and highly reliable cooling method for underwater hydraulic stations to overcome the shortcomings of existing technologies.

[0005] However, as underwater equipment develops towards higher power density, the system's heat load increases significantly. The heat exchange efficiency of the aforementioned heat dissipation methods is limited, which can easily lead to excessively high oil temperature and accelerated oil aging, and may also cause thermal deformation of components. Therefore, it is difficult to meet the actual use requirements of deep-sea equipment for long-term, high-reliability operation. Summary of the Invention

[0006] The purpose of this application is to provide a cooling oil tank and an underwater hydraulic station, aiming to solve the problem of how to improve the heat dissipation efficiency of the underwater hydraulic station.

[0007] In a first aspect, this application provides a heat dissipation oil tank, including an oil tank housing and a mating assembly and an end cap assembly respectively disposed on both axial sides of the oil tank housing: The oil tank housing has an oil cavity for containing oil, and the shell wall of the oil tank housing has an axially penetrating oil return channel. The two ends of the oil tank housing in the axial direction are respectively provided with an oil return inlet and an oil return outlet communicating with the oil cavity. The docking assembly is provided with a first docking circuit, the inlet end of which is connected to the oil return outlet, and the outlet end of which is connected to the inlet end of the oil return channel; the end cap assembly is provided with an oil return flow channel, the inlet end of which is connected to the outlet end of the oil return channel, and the outlet end of which is connected to the oil return inlet, so as to form a heat dissipation circuit for supplying cooling oil to circulate into the oil cavity.

[0008] Furthermore, the oil return inlet is located on the axial end face of the oil tank housing and is positioned close to the center of the axial end face; The return oil channel is a vortex-shaped channel, with the inlet end of the vortex-shaped channel directly connected to the outlet end of the return oil channel, and the outlet end of the vortex-shaped channel directly connected to the return oil inlet.

[0009] Furthermore, the end cap assembly includes an inner end cap connected to the fuel tank housing and an outer end cap disposed on the side of the inner end cap away from the fuel tank housing; The outer end cap and the inner end cap are provided with vortex grooves on their adjacent sides, and the two vortex grooves enclose each other to form the vortex flow channel.

[0010] Furthermore, the inner end cap is provided with a hollow first insertion part and a hollow second insertion part on the side facing the oil tank shell; The first plug-in part is inserted into the outlet end of the oil return channel and communicates with the inlet end of the vortex flow channel, and the second plug-in part is inserted into the oil return inlet and communicates with the outlet end of the vortex flow channel.

[0011] Furthermore, a sealing groove is provided on the outer wall of the first insertion part and the second insertion part, and a first sealing element is provided in the sealing groove.

[0012] Furthermore, the inner end cover has a heat dissipation structure on the side away from the vortex groove and the outer end cover has a heat dissipation structure on the side away from the vortex groove.

[0013] Furthermore, the heat dissipation structure includes a plurality of heat-conducting fins distributed circumferentially along the end cap assembly; A second sealing element is provided between the inner end cap and the outer end cap; A third sealing element is provided between the docking assembly and the oil tank housing; The cross-section of the vortex groove is semi-circular.

[0014] Furthermore, the docking assembly is also provided with a second docking circuit connected in parallel with the first docking circuit. The inlet end of the second docking circuit is connected to the oil return outlet, and the outlet end of the second docking circuit is connected to the oil cavity. The second docking circuit is equipped with a low-pressure anti-opening structure, which is used to disconnect the connection between the inlet end and the outlet end of the second docking circuit when the oil pressure or flow rate of the oil discharged through the return oil outlet is less than a preset value.

[0015] Furthermore, a sealing shoulder is provided within the second docking circuit; The low-pressure anti-opening structure includes a valve core, an elastic element, and a retaining ring arranged in sequence. The retaining ring is fixedly installed in the second docking circuit. One end of the elastic element is connected to the retaining ring, and the other end of the elastic element is connected to the valve core. The valve core is movably disposed within the second docking circuit. The valve core is used to abut against the sealing shoulder under the elastic action of the elastic member to close the second docking circuit. It can also abut against the elastic member to separate from the sealing shoulder when the oil pressure or flow rate of the oil is greater than a preset value, thereby opening the second docking circuit.

[0016] Secondly, this application also provides an underwater hydraulic station, including an underwater motor, a hydraulic pump, and a cooling oil tank; the underwater motor and the hydraulic pump are respectively located on both sides of the docking assembly.

[0017] The beneficial effects of this invention are: This application provides a cooling oil tank and an underwater hydraulic station. The cooling oil tank includes an oil tank shell and a docking assembly and an end cap assembly disposed on both axial sides of the oil tank shell. An oil cavity for containing oil is formed within the oil tank shell. An axially penetrating oil return channel is provided within the shell wall of the oil tank shell, and an oil return inlet and an oil return outlet communicating with the oil cavity are respectively provided at both axial ends of the oil tank shell. A first docking circuit is provided within the docking assembly. The inlet end of the first docking circuit is connected to the oil return outlet, and the outlet end of the first docking circuit is connected to the inlet end of the oil return channel. An oil return flow channel is provided within the end cap assembly. The inlet end of the oil return flow channel is connected to the outlet end of the oil return channel, and the outlet end of the oil return flow channel is connected to the oil return inlet, thereby forming a cooling circuit for circulating cooling oil to the oil cavity.

[0018] In other words, when the underwater hydraulic station equipped with this cooling oil tank generates high-temperature oil during high-power operation, the high-temperature oil flows from the oil chamber through the return oil outlet and enters the first docking circuit built into the docking assembly. It then flows into the axial return oil channel within the interlayer of the oil tank shell. The high-temperature oil flows slowly along the axial direction of the oil tank shell within the interlayer. During this process, the heat of the oil is continuously transferred to the external low-temperature seawater through the thin wall of the oil tank shell, completing forced heat exchange. The cooled oil flows out from the outlet end of the return oil channel, enters the return oil flow channel inside the end cap assembly, and undergoes heat exchange again. Finally, the fully cooled oil flows back into the oil chamber through the return oil inlet, completing one cooling cycle. During this process, the high-temperature oil achieves sufficient heat exchange with the external low-temperature seawater through a relatively long heat dissipation circuit, ensuring that the temperature of the oil finally returning to the oil chamber is reliably reduced to the required temperature range. This achieves efficient and reliable heat dissipation of the high-temperature oil, avoiding problems such as oil aging or component failure caused by insufficient heat dissipation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view of the underwater hydraulic station shown in the embodiment of this application; Figure 2 This is a side view of the underwater hydraulic station shown in an embodiment of this application; Figure 3 for Figure 2 Sectional view along AA; Figure 4 for Figure 3 A magnified view of the area at point I; Figure 5 for Figure 3 A schematic diagram of the cooling oil tank after it has been rotated 90°. Figure 6 This is a schematic diagram of one side of the oil tank shell of the cooling oil tank shown in the embodiment of this application; Figure 7 for Figure 6 Sectional view along BB; Figure 8 This is a schematic diagram of the other side of the oil tank housing of the cooling oil tank shown in the embodiment of this application; Figure 9 This is a schematic diagram of one side of the inner end cover of the cooling oil tank shown in the embodiment of this application; Figure 10for Figure 9 Sectional view along CC; Figure 11 This is a schematic diagram of the other side of the inner end cover of the cooling oil tank shown in the embodiment of this application; Figure 12 This is a schematic diagram of the structure of the outer end cover of the cooling oil tank shown in an embodiment of this application; Figure 13 for Figure 12 Sectional view along DD; Figure 14 This is a schematic diagram of the valve core of the cooling oil tank shown in the embodiment of this application.

[0021] Figure label: 100. Fuel tank housing; 110. Oil chamber; 120. Oil return channel; 121. Inlet end of oil return channel; 122. Outlet end of oil return channel; 130. Oil return inlet; 200. Dating assembly; 210. First docking circuit; 211. Inlet end of first docking circuit; 212. Outlet end of first docking circuit; 220. Second docking circuit; 221. Sealing shoulder; 230. Main circuit; 300. End cap assembly; 310. Oil return flow channel; 311. Inlet end of oil return flow channel; 312. Oil flow channel outlet end; 320, inner end cap; 321, through hole; 330, outer end cap; 340, vortex groove; 350, first insertion part; 360, second insertion part; 370, sealing groove; 380, first seal; 390, heat dissipation structure; 391, heat-conducting fins; 400, second seal; 500, third seal; 600, low-pressure anti-opening structure; 610, valve core; 620, elastic element; 630, snap ring; 700, underwater motor; 800, hydraulic pump; 900, bolt. Detailed Implementation

[0022] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" 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 with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0023] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0024] Reference Figures 1 to 14 As shown, this embodiment provides a heat dissipation oil tank, including an oil tank housing 100 and a docking assembly 200 and an end cap assembly 300 respectively disposed on both axial sides of the oil tank housing 100.

[0025] The oil tank housing 100 has an oil cavity 110 for containing oil, and the oil tank housing 100 has an axially penetrating oil return channel 120. The oil tank housing 100 has an oil return inlet 130 and an oil return outlet communicating with the oil cavity 110 at both ends of the axial direction.

[0026] The docking assembly 200 is provided with a first docking circuit 210. The inlet end 211 of the first docking circuit is connected to the return oil outlet, and the outlet end 212 of the first docking circuit is connected to the inlet end 121 of the return oil channel 120. The end cap assembly 300 is provided with a return oil flow channel 310. The inlet end 311 of the return oil flow channel is connected to the outlet end 122 of the return oil channel 120, and the outlet end 312 of the return oil flow channel is connected to the return oil inlet 130, so as to form a heat dissipation circuit for supplying oil cooling circulation to the oil chamber 110.

[0027] In practice, the cooling oil tank consists of three main components: the tank shell 100, the docking assembly 200, and the end cap assembly 300. These three components are assembled into a single unit to form an integrated structure for oil storage and cooling circulation, specifically designed to carry the oil and achieve autonomous circulation cooling.

[0028] Specifically, the docking assembly 200 and the fuel tank housing 100, as well as the fuel tank housing 100 and the end cap assembly 300, can be reliably connected by fasteners such as bolts 900 that are circumferentially spaced.

[0029] Furthermore, the hollow area inside the oil tank housing 100 is the oil cavity 110, which is the oil storage chamber used to continuously supply oil to the hydraulic pump 800. The oil return channel 120 provided in the interlayer of the oil cavity 110 and the oil tank housing 100 are independent of each other, and the oil exchange is only achieved through the oil return inlets 130 and oil return outlets at both ends. That is, the oil used for cooling in the oil return channel 120 and the oil in the oil cavity 110 have the same source but different paths.

[0030] It should be noted that traditional fuel tanks have a single-layer solid shell wall, with only the outer wall passively dissipating heat through contact with seawater, resulting in poor heat dissipation efficiency. Therefore, in this embodiment, the fuel tank shell 100 is made into a double-layer sandwich structure, with the sandwich space forming a return oil channel 120 that runs axially through the entire length of the fuel tank shell 100. That is, the return oil channel 120 runs along the axial length of the fuel tank shell 100 (refer to...). Figure 1 The L-direction shown extends from beginning to end, allowing the heat exchange operation to cover the entire axial outer wall of the tank housing 100.

[0031] Oil return outlet and oil return inlet 130 are respectively opened at both ends of the axial direction of the oil tank shell 100. Both of them are connected to the internal oil cavity 110, so that the high-temperature oil in the oil cavity 110 can be discharged into the heat dissipation circuit, and the cooled oil can flow back into the oil cavity 110, thereby realizing efficient and sufficient heat exchange and heat dissipation of the high-temperature oil.

[0032] Furthermore, the docking assembly 200 integrates a first docking circuit 210, which serves as a transfer and guide for the oil. The end cap assembly 300 has a built-in return oil channel 310, which enables heat exchange and reverse flow of the oil. The specific working logic of the oil cooling cycle is as follows: the high-temperature oil continuously heated in the oil chamber 110 first flows out from the return oil outlet of the oil tank shell 100 and enters the first docking circuit 210 preset inside the docking assembly 200. It is then guided by the first docking circuit 210 into the return oil channel 120 of the oil tank shell wall interlayer, so that the high-temperature oil completely enters the heat exchange interlayer and makes full use of the heat exchange between the outer wall of the oil tank shell 100 and the external seawater, thereby reducing the temperature of the oil to a certain extent. Then, the oil enters the return oil channel 310 of the end cap assembly 300. After further heat exchange with the external low-temperature seawater through the return oil channel 310, it is then returned to the oil chamber 110 from the return oil inlet 130 of the oil tank shell 100 under the diverting and guiding action of the return oil channel 310, completing a single cooling cycle. The specific cooling cycle path can be found in [reference needed]. Figure 5 As shown by the dashed arrow in the image.

[0033] In summary, in this embodiment, when the underwater hydraulic station equipped with the cooling oil tank generates high-temperature oil during high-power operation, the high-temperature oil flows out of the oil chamber 110 through the return oil outlet and enters the first docking circuit 210 built into the docking assembly 200, and then flows into the axial return oil channel 120 within the interlayer of the tank shell. The high-temperature oil flows slowly along the axial direction of the tank shell 100 within the interlayer of the tank shell 100. During this process, the heat of the oil is continuously transferred to the external low-temperature seawater through the thin wall of the tank shell 100, completing forced heat exchange. The cooled oil flows out from the outlet end of the return oil channel 120 and enters the return oil flow channel 310 inside the end cap assembly 300 for heat exchange and dissipation again, so that the oil that has been fully cooled finally flows back into the oil chamber 110 through the return oil inlet 130, completing one cooling cycle. During this process, the high-temperature oil undergoes a long heat dissipation circuit to achieve sufficient heat exchange with the external low-temperature seawater, so that the temperature of the oil that finally flows back into the oil chamber 110 can be reliably reduced to the required temperature range. This achieves efficient and reliable heat dissipation of the high-temperature oil, thus avoiding problems such as oil aging or component failure caused by insufficient heat dissipation.

[0034] Reference Figure 1 , Figure 5 , Figures 8 to 13 As shown, in some embodiments, the oil return inlet 130 is disposed on the axial end face of the oil tank housing 100 and is disposed near the center of the axial end face; the oil return channel 310 is a vortex channel, the inlet end of the vortex channel is directly connected to the outlet end of the oil return channel 120, and the outlet end of the vortex channel is directly connected to the oil return inlet 130.

[0035] In practice, the oil tank housing 100 has two circular end faces at its two axial ends. The oil return inlet 130 is located on the axial end face of one of the ends. The opening is not near the edge of the housing side wall, but near the center of the circular end face. Specifically, it can be located near the center or the center of the oil return inlet 130 can be concentric with the center of the circular end face.

[0036] Since the oil return inlet 130 is the final inlet for the oil in the heat dissipation circuit to flow back into the oil chamber 110, the cooled low-temperature oil flows into the oil chamber 110 through the oil return inlet 130 which is close to or located in the center, making it easier to mix directly with the oil in the oil chamber 110.

[0037] Furthermore, a vortex-shaped flow channel is machined inside the end cap assembly 300. The vortex-shaped flow channel spirals and contracts from the outside to the inside, forming a continuously gradually changing vortex-shaped oil passage, that is, forming a spiral spiral structure flow channel. The inlet end of the vortex-shaped flow channel is directly connected to the outlet end 122 of the return oil channel 120: the cooling oil flowing out from the interlayer directly enters the outer inlet of the vortex-shaped flow channel, so that there is no oil passage deviation or diversion.

[0038] The inner center end of the vortex flow channel is directly connected to the return oil inlet 130. After the oil flows inward along the vortex flow channel, it is directly sent from the central outlet to the central return oil inlet 130. The entire flow path has no dead angles or bends, making the flow of oil smoother.

[0039] The specific cooling path of the oil is as follows: the high-temperature oil in the oil chamber 110 flows out through the return oil outlet and enters the first docking circuit 210 of the docking assembly 200. Then, it exchanges heat with seawater through the axial return oil channel 120 in the oil tank shell wall and is cooled down. After flowing out through the outlet of the return oil channel 120, it enters the outer inlet of the vortex channel of the end cover assembly 300 and flows spirally inward at a uniform speed along the vortex channel. Then, it flows out through the center outlet of the vortex channel and flows back into the oil chamber 110 through the return oil inlet 130 at the center of the end face.

[0040] It should be noted that the vortex flow channel can significantly extend the flow distance of the oil within the end cap assembly 300, allowing the oil to continuously exchange heat with the external low-temperature seawater within the vortex flow channel, thereby achieving secondary auxiliary heat dissipation. At the same time, the vortex flow channel can continuously agitate the oil, disrupting the fluid boundary layer, making the oil temperature more uniform and avoiding localized low temperatures or insufficient cooling, thus further improving the overall heat dissipation capacity.

[0041] In addition, the inlet of the vortex flow channel and the outlet of the return oil channel 120, as well as the outlet of the vortex flow channel and the return oil inlet 130, are directly connected, so that the oil flow can be without sharp bends, oil circuit misalignment, or throttling changes. This design can reduce the resistance along the oil flow and local pressure loss, resulting in lower oil flow loss.

[0042] Reference Figures 1 to 13 As shown, in some embodiments, the end cap assembly 300 includes an inner end cap 320 connected to the fuel tank housing 100 and an outer end cap 330 disposed on the side of the inner end cap 320 away from the fuel tank housing 100; the outer end cap 330 and the inner end cap 320 are provided with vortex grooves 340 on the side close to each other, and the two vortex grooves 340 surround each other to form a vortex flow channel.

[0043] In practice, the end cap assembly 300 is divided into two layers of parts, namely the inner end cap 320 and the outer end cap 330, which are interlocked or attached to each other.

[0044] The inner end cap 320 is located on the side of the oil tank housing 100 and is directly sealed to the axial end face of the oil tank housing 100. The inner end cap 320 has two through holes 321 that communicate with the vortex groove 340. One of the two through holes 321 is aligned and connected to the return oil inlet 130, and the other of the two through holes 321 is aligned and connected to the outlet end of the return oil channel 120.

[0045] The inner end cap 320 has a vortex groove 340 machined on the surface facing away from the oil tank housing 100 (i.e., the side facing the outer end cap 330), and the outer end cap 330 has a vortex groove 340 machined on the mating surface facing the inner end cap 320. When the inner end cap 320 and the outer end cap 330 are pressed together, the two vortex grooves 340 interlock and together form a complete and sealed vortex flow channel, so that the oil can only flow spirally within the cavity formed by the two vortex grooves 340, and there is no leakage.

[0046] In addition, compared to the method of machining a vortex flow channel in a one-piece end cap, which makes the machining difficult, this embodiment uses two end caps, each with a half groove. Only shallow vortex grooves need to be machined on the mating surfaces of the inner end cap 320 and the outer end cap 330. The two shallow grooves are fastened together to form a complete vortex flow channel, which makes the overall machining difficult.

[0047] For example, the cross-section of the vortex groove 340 can be made into any cross-section such as circular, semi-circular, or rectangular.

[0048] Reference Figure 5 , Figure 7 and Figure 10 As shown, in some embodiments, the inner end cap 320 is provided with a hollow first insertion portion 350 and a hollow second insertion portion 360 on the side facing the oil tank housing 100; the first insertion portion 350 is inserted into the outlet end of the return oil channel 120 and communicates with the inlet end of the vortex flow channel, and the second insertion portion 360 is inserted into the return oil inlet 130 and communicates with the outlet end of the vortex flow channel.

[0049] In this embodiment, two hollow protruding structures, namely the first insertion part 350 and the second insertion part 360, are integrally machined on the inner end face of the inner end cover 320 facing the oil tank shell 100. Both the first insertion part 350 and the second insertion part 360 are hollow through structures, and the internal hollow channels serve as oil flow channels.

[0050] During assembly, the first insertion part 350 is directly inserted into the outlet end of the oil return channel 120 of the oil tank housing 100 to achieve radial limiting and axial insertion sealing. This allows the oil that has completed preliminary heat exchange in the oil return channel 120 to flow directly into the inner cavity of the hollow first insertion part 350 and then smoothly into the inlet end of the vortex channel, achieving a gapless connection between the oil return channel 120 and the inlet end of the vortex channel.

[0051] Similarly, the second insertion part 360 is inserted into the oil return inlet 130 of the oil tank housing 100, so that after the oil completes secondary cooling by spiraling flow in the vortex channel, it directly enters the inner cavity of the hollow second insertion part 360 from the outlet end of the vortex channel, and then passes through the second insertion part 360 directly into the oil cavity 110 of the oil tank to complete the return flow of the cooling oil.

[0052] The entire cooling circulation path of the oil is as follows: high-temperature hydraulic oil in oil chamber 110 → return oil outlet → first docking circuit 210 of docking assembly 200 → inlet end of return oil channel 120 → outlet end of return oil channel 120 → inner cavity of hollow first insertion part 350 → inlet end of vortex flow channel → outlet end of vortex flow channel → inner cavity of hollow second insertion part 360 → return oil inlet 130 → oil chamber 110.

[0053] Reference Figures 1 to 10 As shown, in some embodiments, a sealing groove 370 is provided on the outer wall of the first insertion part 350 and the second insertion part 360, and a first sealing member 380 is provided in the sealing groove 370.

[0054] In this embodiment, both the first insertion part 350 and the second insertion part 360 can be provided with sealing grooves 370, so that after the first insertion part 350 is inserted into the outlet end of the oil return channel 120, it can be sealed and connected with the oil return channel 120 through the first sealing member 380 provided in the sealing groove 370, and after the second insertion part 360 is inserted into the oil return inlet 130, it can be sealed and connected with the oil return inlet 130 through the first sealing member 380 provided in the sealing groove 370.

[0055] For example, the sealing groove 370 can be an annular sealing groove 370 extending circumferentially along the first insertion portion 350 or the second insertion portion 360, and the first sealing member 380 can be an annular sealing member, thereby achieving a reliable seal throughout the entire circumferential direction.

[0056] For example, the first seal 380 can be a sealing ring.

[0057] Reference Figures 1 to 13 As shown, in some embodiments, the side of the inner end cap 320 away from the vortex groove 340 and / or the side of the outer end cap 330 away from the vortex groove 340 are provided with a heat dissipation structure 390, so that the oil can be further cooled to the external seawater through the heat dissipation structure 390 during the flow of the oil in the vortex channel, so as to further improve the heat dissipation efficiency.

[0058] For example, the heat dissipation structure 390 can be provided only on the side of the inner end cover 320 away from the vortex groove 340, or the heat dissipation structure 390 can be provided only on the side of the outer end cover 330 away from the vortex groove 340, or the heat dissipation structure 390 can be provided on both the side of the inner end cover 320 away from the vortex groove 340 and the side of the outer end cover 330 away from the vortex groove 340, so as to further expand the contact area between the end cover assembly 300 and the external seawater, thereby improving the heat exchange efficiency.

[0059] Reference Figure 2 , Figures 8 to 11As shown, in some embodiments, the heat dissipation structure 390 includes a plurality of heat-conducting fins 391 distributed circumferentially along the end cap assembly 300, so that the residual heat released by the oil in the vortex channel can be quickly dissipated into the seawater through the heat-conducting fins 391, further reducing the temperature of the oil flowing back to the oil chamber 110, thereby significantly improving the overall heat dissipation efficiency of the heat dissipation tank, so as to better cope with the high-power continuous heat generation conditions of the underwater hydraulic station.

[0060] For example, the heat dissipation structure 390 is configured as multiple heat-conducting fins 391 evenly arranged along the circumferential direction of the end cap assembly 300. The heat-conducting fins 391 and the end cap assembly 300 can be integrally formed or tightly welded to achieve effective heat dissipation through the multiple heat-conducting fins 391.

[0061] The oil flows and releases heat in the vortex-shaped channel enclosed by the double end caps. The heat is transferred to the circumferential heat-guiding fins 391 through the inner and outer end caps 330 substrate, and the heat dissipation is completed by the contact between the fins and the seawater.

[0062] Reference Figure 3 , Figure 5 As shown, a second sealing element 400 is provided between the inner end cap 320 and the outer end cap 330 to achieve a sealing fit between them. For example, the second sealing element 400 can be a sealing ring.

[0063] Reference Figures 3 to 5 As shown, a third seal 500 is provided between the docking assembly 200 and the oil tank housing 100 to achieve a sealing fit between the two and prevent oil leakage. For example, the third seal 500 can be a sealing ring.

[0064] Reference Figures 3 to 5 As shown, in some embodiments, the docking assembly 200 is further provided with a second docking circuit 220 connected in parallel with the first docking circuit 210. The inlet end of the second docking circuit 220 is connected to the return oil outlet, and the outlet end of the second docking circuit 220 is connected to the oil chamber 110. The second docking circuit 220 is provided with a low-pressure anti-opening structure 600, which is used to disconnect the connection between the inlet end of the second docking circuit 220 and the outlet end of the second docking circuit 220 when the oil pressure or flow rate of the oil discharged through the return oil outlet is less than a preset value.

[0065] In specific implementation, the docking component 200 has two parallel oil circuits inside, namely the first docking circuit 210 (main cooling oil circuit) and the second docking circuit 220 (bypass voltage stabilizing oil circuit). The inlet ends of the two circuits share the same return oil outlet, that is, the oil discharged from the return oil outlet can simultaneously enter the first docking circuit 210 and the second docking circuit 220.

[0066] Specifically, for the first docking circuit 210, the oil discharged from the return oil outlet enters the return oil passage through the first docking circuit 210, then enters the return oil inlet 130 through the vortex flow channel, and finally circulates to the oil chamber 110. This path is the main forced cooling circulation path under normal operating conditions. For the second docking circuit 220, the oil discharged from the return oil outlet flows directly back to the oil chamber 110 through the second docking circuit 220, which is a bypass branch of the cooling circuit. The inlets of the two circuits are from the same source, and their outlets have independent destinations, forming a parallel oil circuit structure.

[0067] The low-pressure anti-opening structure 600 is integrated inside the second docking circuit 220 and serves as a branch on / off control element. Its triggering logic uses dual threshold values ​​for oil pressure and flow rate as judgment conditions. When the return oil pressure is less than the preset pressure threshold, the low-pressure anti-opening structure 600 cuts off the internal channel of the second docking circuit 220, closing the branch and preventing oil from directly flowing back to the oil chamber 110 via the second docking circuit 220. When the system flow rate increases and the return oil pressure reaches or exceeds the preset value, the low-pressure anti-opening structure 600 opens the second docking circuit 220, opening the branch and allowing a large amount of oil to directly flow back to the oil chamber 110 from the bypass branch, thus preventing excessive return oil back pressure and ensuring smooth return oil flow.

[0068] Reference Figures 3 to 5 , Figure 14 As shown, in some embodiments, a sealing shoulder 221 is provided in the second docking circuit 220; the low-pressure anti-opening structure 600 includes a valve core 610, an elastic element 620 and a retaining ring 630 arranged in sequence. The retaining ring 630 is fixedly disposed in the second docking circuit 220. One end of the elastic element 620 is connected to the retaining ring 630, and the other end of the elastic element 620 is connected to the valve core 610. The valve core 610 is movably disposed in the second docking circuit 220. The valve core 610 is used to abut against the sealing shoulder 221 under the elastic action of the elastic element 620 to close the second docking circuit 220, and can abut against the elastic element 620 to separate from the sealing shoulder 221 when the oil pressure is greater than a preset value, so as to open the second docking circuit 220.

[0069] In practice, the sealing shoulder 221 is integrally formed on the inner wall of the flow channel of the second docking circuit 220, and has an annular stepped structure, so that the side of the annular stepped structure facing the oil cavity 110 forms an annular sealing end face. The sealing shoulder 221 divides the second docking circuit 220 into two sections along the oil path: upstream (near the return oil outlet) and downstream (connecting to the oil cavity 110). The valve core 610 can be tightly fitted to the annular sealing end face of the sealing shoulder 221 to achieve oil path cutoff and separation; after the valve core 610 is separated from the sealing shoulder 221, the oil can pass through the sealing shoulder 221 along the gap between the valve core 610 and the inner wall of the flow channel, so that the second docking circuit 220 is open.

[0070] Specifically, the low-pressure anti-opening structure 600 includes, in sequence along the oil flow direction, a valve core 610, an elastic element 620, and a retaining ring 630. The retaining ring 630 is fixedly mounted in a pre-reserved groove on the inner wall of the flow channel of the second docking circuit 220, serving as a tail support and limiting element for the elastic element 620, and does not undergo axial displacement.

[0071] The elastic element 620 is generally a compression spring or a rubber pad, etc., with elastic recovery properties. One end of it abuts against the end face of the retaining ring 630, and the other end is pressed against the tail of the valve core 610, continuously applying an axial preload force toward the sealing shoulder 221 to the valve core 610. The preload force corresponds to the system's preset opening oil / flow threshold.

[0072] The valve core 610 is movably installed inside the flow channel of the second docking circuit 220 and can slide back and forth along the oil circuit axis to achieve switching between two working states.

[0073] Specifically, when the oil pressure / flow rate is less than the preset value, the hydraulic pressure of the oil flowing out of the return oil outlet acting on the front end of the valve core 610 is less than the pre-tightening force of the elastic element 620. The elastic element 620 continuously pushes the valve core 610 forward, causing the head of the valve core 610 to be tightly pressed against the sealing shoulder 221. The annular sealing end face is completely sealed, and the upstream and downstream of the second docking circuit 220 are isolated, and the branch is closed. At this time, all the oil flowing out from the return oil outlet can only enter the first docking circuit 210 and flow completely through the return oil channel 120 and the vortex flow channel to complete the forced cooling cycle.

[0074] When the oil pressure exceeds the preset value (high load, high flow rate operation condition), the system operates at high power. The oil pressure and flow rate discharged from the return oil outlet increase. The hydraulic pressure acting on the front end of the valve core 610 overcomes the pre-tightening force of the elastic element 620, pushing the valve core 610 backward to compress the elastic element 620. The head of the valve core 610 separates from the sealing shoulder 221, forming an annular flow gap between them. At this time, the high-pressure, high-flow oil can pass through the gap through the sealing shoulder 221 and flow directly back to the oil chamber 110 along the second docking circuit 220, realizing the diversion bypass conduction and thus achieving a safety protection function.

[0075] In addition, the first docking circuit 210 and the second docking circuit 220 can be connected to the return oil outlet through the main circuit 230.

[0076] In summary, the cooling oil tank of this embodiment achieves self-driven cooling of the oil, thereby transforming the passive cooling of the underwater hydraulic station adapted to this cooling oil tank into active cooling. This significantly improves the cooling effect of the underwater hydraulic station, making it suitable for compact underwater hydraulic systems with high reliability requirements.

[0077] Reference Figures 1 to 14As shown, this embodiment also provides an underwater hydraulic station, including an underwater motor 700, a hydraulic pump 800, and a cooling oil tank. The underwater motor 700 and the hydraulic pump 800 are respectively located on both sides of the docking assembly 200. The hydraulic pump 800 is specifically located in the oil chamber 110 and is used to generate high-temperature oil by rotating under the drive of the underwater motor 700.

[0078] The specific structure and implementation principle of the cooling oil tank in this embodiment are the same as those of the cooling oil tank provided in the above embodiments, and can bring the same or similar technical effects. They will not be described in detail here. For details, please refer to the description of the above embodiments.

[0079] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0080] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A heat dissipation oil tank, characterized in that, Includes a fuel tank housing and mating assemblies and end cap assemblies respectively disposed on both axial sides of the fuel tank housing: The oil tank housing has an oil cavity for containing oil, and the shell wall of the oil tank housing has an axially penetrating oil return channel. The two ends of the oil tank housing in the axial direction are respectively provided with an oil return inlet and an oil return outlet communicating with the oil cavity. The docking assembly is provided with a first docking circuit, the inlet end of which is connected to the oil return outlet, and the outlet end of which is connected to the inlet end of the oil return channel; the end cap assembly is provided with an oil return flow channel, the inlet end of which is connected to the outlet end of the oil return channel, and the outlet end of which is connected to the oil return inlet, so as to form a heat dissipation circuit for supplying cooling oil to circulate into the oil cavity.

2. The cooling oil tank according to claim 1, characterized in that, The oil return inlet is located on the axial end face of the oil tank housing and is positioned close to the center of the axial end face; The return oil channel is a vortex-shaped channel, with the inlet end of the vortex-shaped channel directly connected to the outlet end of the return oil channel, and the outlet end of the vortex-shaped channel directly connected to the return oil inlet.

3. The cooling oil tank according to claim 2, characterized in that, The end cap assembly includes an inner end cap connected to the fuel tank housing and an outer end cap disposed on the side of the inner end cap away from the fuel tank housing. The outer end cap and the inner end cap are provided with vortex grooves on their adjacent sides, and the two vortex grooves enclose each other to form the vortex flow channel.

4. The cooling oil tank according to claim 3, characterized in that, The inner end cap is provided with a hollow first insertion part and a hollow second insertion part on the side facing the oil tank shell. The first plug-in part is inserted into the outlet end of the oil return channel and communicates with the inlet end of the vortex flow channel, and the second plug-in part is inserted into the oil return inlet and communicates with the outlet end of the vortex flow channel.

5. The cooling oil tank according to claim 4, characterized in that, Both the first and second insertion parts have sealing grooves on their outer walls, and a first sealing element is provided in the sealing groove.

6. The cooling oil tank according to claim 3, characterized in that, The inner end cover has a heat dissipation structure on the side away from the vortex groove, and the outer end cover has a heat dissipation structure on the side away from the vortex groove.

7. The cooling oil tank according to claim 6, characterized in that, The heat dissipation structure includes a plurality of heat-conducting fins distributed circumferentially along the end cap assembly. A second sealing element is provided between the inner end cap and the outer end cap; A third sealing element is provided between the docking assembly and the oil tank housing; The cross-section of the vortex groove is semi-circular.

8. The cooling oil tank according to any one of claims 1 to 7, characterized in that, The docking assembly is further provided with a second docking circuit connected in parallel with the first docking circuit. The inlet end of the second docking circuit is connected to the oil return outlet, and the outlet end of the second docking circuit is connected to the oil cavity. The second docking circuit is equipped with a low-pressure anti-opening structure, which is used to disconnect the connection between the inlet end and the outlet end of the second docking circuit when the oil pressure or flow rate of the oil discharged through the return oil outlet is less than a preset value.

9. The cooling oil tank according to claim 8, characterized in that, A sealing shoulder is provided in the second docking circuit; The low-pressure anti-opening structure includes a valve core, an elastic element, and a retaining ring arranged in sequence. The retaining ring is fixedly installed in the second docking circuit. One end of the elastic element is connected to the retaining ring, and the other end of the elastic element is connected to the valve core. The valve core is movably disposed within the second docking circuit. The valve core is used to abut against the sealing shoulder under the elastic action of the elastic member to close the second docking circuit. It can also abut against the elastic member to separate from the sealing shoulder when the oil pressure or flow rate of the oil is greater than a preset value, thereby opening the second docking circuit.

10. An underwater hydraulic station, characterized in that, Includes an underwater motor, a hydraulic pump, and a cooling oil tank as described in any one of claims 1 to 9; The underwater motor and the hydraulic pump are located on opposite sides of the docking assembly.

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