Marine floating photovoltaic device with porous multi-stage attenuated wave energy breakwater

Abstract

This invention discloses a floating photovoltaic device with a porous, multi-stage wave-damping breakwater. It includes solar panels fixed to a support platform by multiple support rods. These support platforms are interconnected to form a platform structure. Multiple breakwaters are installed on the outer ends of the support platforms, and a power generation mechanism is located at the bottom of the support platforms. The breakwater design reduces the impact of waves on the support platform by using a first wave-pushing plate above the water surface and a second wave-pushing plate below the water surface to reduce the impact of water currents. It also allows for the reuse of waste buffer oil, avoiding resource waste. Furthermore, the power generation mechanism ensures that the first bevel gear rotates regardless of the direction of impact, improving the operating environment of the power generation mechanism and increasing the efficiency of the photovoltaic device through the energy of ocean currents.

Description

Technical Field

[0001] This invention relates to a floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, belonging to the field of marine photovoltaic power generation technology. Background Technology

[0002] Photovoltaics, short for solar photovoltaic power generation system, is a new type of power generation system that uses the photovoltaic effect of solar cell semiconductor materials to convert solar radiation energy into electrical energy. With social development, solar energy, as a new and clean energy source, has gradually gained attention and achieved significant development results. Compared to ground-based photovoltaic power stations, floating photovoltaic power stations avoid land limitations and also play a certain role in protecting the aquatic ecosystem, such as reducing water evaporation and inhibiting algae growth. Furthermore, they can be combined with aquaculture to truly achieve comprehensive resource utilization. Breakwaters, as an important component of offshore photovoltaic systems, play a crucial role in blocking the impact of waves, maintaining water surface stability to protect offshore photovoltaic platforms from bad weather, and ensuring the safety and stability of the platforms.

[0003] However, existing breakwaters cannot fully utilize the movement of ocean waves to achieve the function of wave suppression using the breakwater's own weight. In addition, they cannot fully utilize the impact force of incoming waves, and simply using a solar photovoltaic power generation system cannot make good use of the energy of ocean currents. Summary of the Invention

[0004] The purpose of this invention is to provide a floating photovoltaic device for marine applications with a porous, multi-stage attenuation wave energy breakwater, thereby addressing the technical problems existing in the prior art.

[0005] The technical solution of the present invention: a floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, comprising a solar panel, the solar panel being fixed to a support platform by multiple support rods, the multiple support platforms being interconnected to form a platform structure, multiple breakwaters being provided at the outer ends of the support platforms at the edges of the platform structure, and a power generation mechanism being provided at the bottom of the support platforms.

[0006] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the breakwater includes an outer shell fixedly connected to the side wall of a support platform. The inner side of the outer shell has multiple drainage holes, and the outer side is slidably connected to a baffle. The baffle has multiple grooves, and a first wave-pushing plate and a second wave-pushing plate are slidably connected in the multiple grooves respectively. A first damper and a second damper are fixedly connected to the baffle. Both the first damper and the second damper are fixedly connected to the breakwater. The first wave-pushing plate and the second wave-pushing plate are respectively connected to the outer shell through different buffer mechanisms.

[0007] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the buffer mechanism includes a chute located on the inner wall of the outer shell, a sliding groove is provided in the chute, a push rod is slidably connected in the sliding groove, a second spring is provided in the sliding groove, the two ends of the second spring are fixedly connected to the push rod and the chute respectively, and multiple push rods are fixedly connected to the first wave-pushing plate and the second wave-pushing plate respectively, and the push rods slide through the baffle.

[0008] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the first damper includes a damper housing fixedly connected to a baffle, a damper inner cylinder coaxially fixedly connected inside the damper housing, multiple through holes on the side wall of the damper inner cylinder, a damper push rod slidably connected inside the damper housing, the inner end of the damper push rod being connected to a first spring installed inside the damper inner cylinder via a piston, a second oil inlet pipe penetrating the side wall of the damper housing being provided on the side wall of the damper inner cylinder, an L-shaped oil outlet pipe being provided inside the second oil inlet pipe, and one end of the oil outlet pipe penetrating the side wall of the second oil inlet pipe.

[0009] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the power generation mechanism includes a generator housing fixedly connected to the bottom of a support platform. A fixed ring is rotatably connected inside the generator housing. A fixed block is provided on the inner wall of the fixed ring. Support columns are symmetrically arranged on the outer wall of the fixed ring. The same first bevel gear is fixedly connected to the opposite ends of multiple support columns. The first bevel gear meshes with a second bevel gear, and the first and second bevel gears are arranged perpendicularly. Multiple oil outlet grooves are provided on the top of the second bevel gear. A threaded column is slidably connected to the inner wall of the fixed ring, and the fixed block is slidably engaged in the threaded groove of the threaded column. A rotating column arranged in a ring is slidably connected to the outer wall of the fixed ring, and the outer wall of the rotating column is slidably connected to the inner wall of the first bevel gear. A first threaded groove and a second threaded groove are opened through the rotating column. The first threaded groove and the second threaded groove are intersecting. Multiple support columns are slidably engaged in the first threaded groove and the second threaded groove, respectively. A second push plate and a first push plate are respectively provided at the opposite ends of the threaded column and the rotating column. Both the threaded column and the rotating column slide through the generator housing.

[0010] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the power generation mechanism further includes a rotating shaft that rotates through the generator housing, and the rotating shaft is fixedly connected to a second bevel gear. An oil storage block is fixedly connected to the bottom of the rotating shaft, and multiple oil storage tanks are provided at the bottom of the oil storage block. Multiple oil inlet holes are provided on the side wall of the oil storage block. The multiple oil storage tanks are connected to the inside of the generator housing through different oil inlet holes. An arc-shaped plate is provided inside the generator housing that is slidably connected to the side wall of the rotating shaft.

[0011] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, a placement slot is provided at the bottom of the generator casing, and the same oil storage pipe is provided on the side wall and bottom of the generator casing. The placement slot is connected to the inner side wall of the generator casing through the C-shaped oil storage pipe. A scraper is slidably connected in the placement slot, and a third spring is fixedly connected to the scraper and fixedly connected to the bottom of the placement slot. A nozzle is provided on the oil storage pipe.

[0012] In the aforementioned floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater, the oil storage tank is arranged in a right-angled trapezoidal shape, and the top of the oil storage tank is larger than the top of the scraper. A first oil inlet pipe is provided through the side wall of the generator casing, and the first oil inlet pipe is connected to the oil outlet pipe.

[0013] The beneficial effects of this invention are as follows: Compared with the prior art, the floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater provided by this invention, through the setting of the breakwater, wherein the first wave-pushing plate above the water surface can reduce the impact of sea waves on the supporting platform, and the second wave-pushing plate below the water surface can reduce the impact of water flow on the supporting platform. At the same time, through the setting of the first damper, oil inlet, third spring, scraper, oil storage block, and oil storage pipe, waste buffer oil can be reused, avoiding resource waste. Furthermore, the setting of the power generation mechanism allows the first bevel gear to rotate regardless of the direction of impact, improving the operating environment of the power generation mechanism and increasing the working efficiency of the photovoltaic device through the energy of ocean currents. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of a single energy storage platform structure according to the present invention;

[0016] Figure 3 This is a schematic diagram of the drive mechanism structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the energy absorption mechanism of the present invention;

[0018] Figure 5 This is a schematic diagram of the breakwater structure of the present invention;

[0019] Figure 6 This is a schematic diagram of the partial explosion structure of the breakwater of the present invention;

[0020] Figure 7 for Figure 4 Enlarged structural diagram at point A;

[0021] Figure 8 for Figure 6 Enlarged schematic diagram of the structure at point B.

[0022] Reference numerals: 1. Solar panel; 2. Support rod; 3. Support platform; 4. Breakwater; 5. Power generation mechanism; 6. Generator housing; 7. Threaded column; 8. Rotating column; 801. First threaded groove; 802. Second threaded groove; 9. First push plate; 10. Second push plate; 11. First bevel gear; 12. Fixing ring; 13. Support column; 14. Fixing block; 15. Second bevel gear; 16. Oil inlet; 17. Rotating shaft; 18. Oil storage pipe; 19. First oil inlet pipe; 20. Baffle; 1. First pusher plate; 22. Second pusher plate; 23. First damper; 231. Damper housing; 232. Damper push rod; 233. Damper inner cylinder; 234. Piston; 235. First spring; 236. Through hole; 237. Second oil inlet pipe; 238. Oil outlet pipe; 24. Second damper; 25. Drain hole; 26. Push rod; 27. Second spring; 28. Slide groove; 29. ​​Oil storage block; 30. Arc plate; 31. Scraper; 32. Third spring; 33. Oil storage tank. Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] An embodiment of the present invention: a floating photovoltaic device at sea with a porous, multi-stage attenuation wave energy breakwater, such as... Figure 1-8 As shown, the system includes multiple solar panels 1 for collecting solar energy, multiple support rods 2, and multiple support platforms 3. Each solar panel 1 and each support platform 3 is fixedly connected by multiple support rods 2, and the multiple support platforms 3 can be interconnected to form a platform structure. The size of the photovoltaic device can be changed by setting different numbers of support platforms 3. Multiple breakwaters 4 are set on the outer wall of the support platform 3 at the outermost edge of the platform structure to absorb ocean wave energy. The breakwaters 4 can buffer and offset the impact force received by the support platform 3. The bottom of the support platform 3 is equipped with a power generation mechanism 5 that generates electricity by utilizing ocean waves. The power generation mechanism 5 can not only generate electricity by utilizing ocean waves, but also increase the power generation efficiency of the photovoltaic device.

[0025] The breakwater 4 includes an outer shell fixedly connected to the side wall of the support platform 3. On one side of the outer shell connected to the support platform 3, multiple drainage holes 25 are provided for drainage. On the other side, a baffle 20 is slidably connected. The baffle 20 has multiple grooves, and a first wave-pushing plate 21 and a second wave-pushing plate 22 are slidably connected within each groove. The first wave-pushing plate 21 is located above the water surface, and the second wave-pushing plate 22 is located below the water surface. The first wave-pushing plate 21 above the water surface reduces the impact of sea waves on the support platform 3, while the second wave-pushing plate 22 below the water surface reduces the impact of water flow on the support platform 3. To withstand the impact of the support platform 3, a first damper 23 is fixedly connected to the baffle 20. A second damper 24 is symmetrically arranged on both sides of the first damper 23. Both the first damper 23 and the second damper 24 are fixedly connected to the breakwater 4. The setting of multiple dampers can increase the buffering effect of the baffle 20. The first wave pusher 21 and the second wave pusher 22 are respectively connected to the shell through different buffering mechanisms. The buffering mechanism can not only buffer the first wave pusher 21 and the second wave pusher 22, but also reset the first wave pusher 21 and the second wave pusher 22 after buffering.

[0026] The buffer mechanism includes a groove 28 located on the inner wall of the outer shell. A sliding slot is formed within the groove 28, and a push rod 26 is slidably connected within the sliding slot, allowing the push rod 26 to slide within the groove 28. A second spring 27 is installed within the sliding slot, with its two ends fixedly connected to the push rod 26 and the groove 28, respectively. Multiple push rods 26 are fixedly connected to a first wave-pushing plate 21 and a second wave-pushing plate 22, and the push rods 26 slide through a baffle 20. When the first wave-pushing plate 21 and the second wave-pushing plate 22 are impacted, they compress different push rods 26. When the push rod 26 is under pressure, it compresses the second spring 27. When the push rod 26 loses pressure, the second spring 27 resets, causing the push rod 26 to reset as well. Simultaneously, different push rods 26 cause the first wave-pushing plate 21 and the second wave-pushing plate 22 to reset, thereby buffering the impact of waves and currents.

[0027] The first damper 23 includes a damper housing 231 fixedly connected to the baffle 20. A damper inner cylinder 233 is coaxially fixedly connected inside the damper housing 231. The inner cylinder 233 has multiple through holes 236 on its side wall for oil leakage. This arrangement is designed to discharge the buffer oil inside the inner cylinder 23. A damper push rod 232 is slidably connected inside the damper housing 231. One end of the damper push rod 232 is equipped with a piston 234, and the other end of the damper push rod 232 is connected to the anti-dampening device. The outer shell of the breakwater 4 is fixedly connected, allowing for relative sliding between the baffle 20 and the outer shell of the breakwater 4. A first spring 235 is installed inside the inner cylinder 233 of the damper, which is filled with buffer oil for cushioning. The piston 234 is connected to the outer shell 231 of the damper via the first spring 235. This arrangement is intended to compress the buffer oil placed inside the inner cylinder 233 of the damper when the piston 234 moves, thus expelling the buffer oil from the inner cylinder 233 of the damper. A second oil inlet pipe 237 is provided on the side wall of the cylinder 233, penetrating the side wall of the damper housing 231. An L-shaped oil outlet pipe 238 is provided inside the second oil inlet pipe 237, with one end of the outlet pipe 238 penetrating the side wall of the second oil inlet pipe 237. This configuration allows for the flow of buffer oil from the outlet pipe 238 as the buffer oil level between the damper housing 231 and the inner cylinder 233 increases, thus filling the inner cylinder 233 with buffer oil via the second oil inlet pipe 237. Regarding the buffer oil, when the baffle 20 is impacted, it squeezes the first damper 23. At the same time, the damper push rod 232 pushes the piston 234 at the end to move. When the piston 234 moves, it can squeeze the buffer oil placed in the inner cylinder 233 of the damper, squeezing the buffer oil out between the damper outer shell 231 and the inner cylinder 233. When there is a lot of buffer oil between the damper outer shell 231 and the inner cylinder 233, as the buffer oil continues to increase, the buffer oil will flow out from the oil outlet pipe 238.

[0028] The second damper 24 has the same structure as the first damper 23.

[0029] The power generation mechanism 5 includes a generator housing 6 fixedly connected to the bottom of the support platform 3. A fixed ring 12 is rotatably connected inside the generator housing 6. A fixed block 14 is fixedly connected to the inner wall of the fixed ring 12. Support columns 13 are symmetrically arranged on the outer wall of the fixed ring 12. Multiple support columns 13 are fixedly connected to the same first bevel gear 11 at opposite ends. The first bevel gear 11 meshes with a second bevel gear 15, and the first bevel gear 11 and the second bevel gear 15 are perpendicularly arranged. Multiple oil outlet grooves are provided on the top of the second bevel gear 15. A threaded column 7 is coaxially slidably connected to the inner wall of the fixed ring 12, and the fixed block 14 slides within the threaded groove on the threaded column 7. This arrangement causes the fixed ring 12 to rotate as the threaded column 7 slides because the fixed block 14 slides within the threaded groove on the threaded column 7. A rotating column 8, arranged in a ring, is coaxially slidably connected to the outer wall of the fixed ring 12, and the outer wall of the rotating column 8 is slidably connected to the inner wall of the first bevel gear 11. The rotating column 8 has a first threaded groove 801 and a second threaded groove 802. The first and second threaded grooves 801 and 802 are intersected. This arrangement allows the fixed ring 12 to rotate when the rotating column 8 slides due to the arrangement of the first threaded groove 801, the second threaded groove 802, and the support column 13. Multiple support columns 13 are slidably connected within the first and second threaded grooves 801 and 802, respectively. A second push plate 10 and a first push plate 9 are respectively provided at opposite ends of the threaded column 7 and the rotating column 8. Both the threaded column 7 and the rotating column 8 slide through the generator housing 6. This arrangement aims to cause the threaded column 7 and the rotating column 8 to slide when the second push plate 10 or the first push plate 9 is impacted by water flow. This sliding motion of the threaded column 7 and the rotating column 8 drives the fixed ring 12 to rotate. The rotation of the fixed ring 12 drives the first bevel gear 11 to rotate, which in turn drives the second bevel gear 15 to rotate. Furthermore, because the second push plate 10 and the first push plate 9 are positioned opposite each other, the first bevel gear 11 can rotate regardless of the direction of impact, thus improving the operating environment of the generator mechanism 5.

[0030] The power generation mechanism 5 also includes a rotating shaft 17 that rotates through the generator housing 6. The rotating shaft 17 can be connected to the generator input terminal to drive the motor to rotate, thereby generating electricity. The rotating shaft 17 is fixedly connected to the second bevel gear 15. This configuration allows the rotating shaft 17 to rotate via the second bevel gear 15. An oil storage block 29 is fixedly connected to the bottom of the rotating shaft 17. The oil storage block 29 can collect oil from inside the motor housing 6. The bottom of the oil storage block 29 is provided with multiple oil storage tanks 33, and the side wall of the oil storage block 29 has multiple oil inlets. The generator housing 6 is connected to the oil inlet 16 through a series of oil storage tanks 33. This arrangement allows waste oil to be collected through the oil inlet 16. The generator housing 6 is equipped with an arc-shaped plate 30 that is slidably connected to the side wall of the rotating shaft 17. This arrangement allows the arc-shaped plate 30 to block the oil inlet 16 when the oil storage tank 33 rotates to the top of the placement tank. Under the action of the third spring 32, the scraper 31 is tangential to the vertical wall of the oil storage chamber. The scraper 31 contacts the oil storage tank 33, completing the preparatory work of squeezing the oil in the oil storage tank 33.

[0031] A placement groove is provided at the bottom of the generator housing 6. The same oil storage pipe 18 is provided on the side wall and bottom of the generator housing 6. The placement groove is connected to the inner side wall of the generator housing 6 through the C-shaped oil storage pipe 18. With this configuration, as the oil in the placement groove increases, the oil in the oil storage pipe 18 can be pushed to the nozzle and sprayed above the second bevel gear 15 through the nozzle. A scraper 31 with a 7-shaped arrangement is slidably connected in the placement groove, and a third spring 32 is fixedly connected to the scraper 31 and fixedly connected to the bottom of the placement groove. A nozzle is provided on the oil storage pipe 18.

[0032] The oil storage tank 33 is arranged in a right-angled trapezoidal shape, and the top of the oil storage tank 33 is larger than the top of the scraper 31. With this arrangement, when the scraper 31 is at the bottom of the oil storage tank 33, as the third spring 32 loses pressure, it drives the scraper 31 to move upward. Since the top of the oil storage tank 33 is larger than the top of the scraper 31, the scraper 31 will not be squeezed during its upward movement. As the oil storage block 29 continues to rotate, it can squeeze the oil. The first oil inlet pipe 19 is provided through the side wall of the generator housing 6. The first oil inlet pipe 19 is connected to the oil outlet pipe 238. The purpose of this arrangement is to receive the buffer oil discharged from the oil outlet pipe 238 through the first oil inlet pipe 19, and at the same time spray the buffer oil into the oil outlet groove on the second bevel gear 15 through the nozzle, so as to realize the utilization of the waste buffer oil.

Claims

1. A floating photovoltaic device for marine applications with a porous, multi-stage attenuation wave energy breakwater, characterized in that: It includes a solar panel (1), which is fixed on a support platform (3) by multiple support rods (2). The multiple support platforms (3) are connected together to form a platform structure. Multiple breakwaters (4) are provided on the outer side of the support platform (3) at the edge of the platform structure. A power generation mechanism (5) is provided at the bottom of the support platform (3). The power generation mechanism (5) includes a generator housing (6) fixedly connected to the bottom of the support platform (3). A fixed ring (12) is rotatably connected inside the generator housing (6). A fixed block (14) is provided on the inner wall of the fixed ring (12). Support columns (13) are symmetrically arranged on the outer wall of the fixed ring (12). The back ends of multiple support columns (13) are fixedly connected to the same first bevel gear (11). The first bevel gear (11) meshes with the second bevel gear (15), and the first bevel gear (11) and the second bevel gear (15) are arranged perpendicularly. Multiple oil outlet grooves are provided on the top of the second bevel gear (15). A threaded column (7) is slidably connected to the inner wall of the fixed ring (12), and the fixed block (14) is slidably engaged with the threaded column. Inside the threaded groove of the threaded column (7), the outer wall of the fixed ring (12) is slidably connected to a rotating column (8) arranged in a ring, and the outer wall of the rotating column (8) is slidably connected to the inner wall of the first bevel gear (11). The rotating column (8) is provided with a first threaded groove (801) and a second threaded groove (802). The first threaded groove (801) and the second threaded groove (802) are opened at an intersection, and multiple support columns (13) are slidably engaged in the first threaded groove (801) and the second threaded groove (802). The opposite ends of the threaded column (7) and the rotating column (8) are respectively provided with a second push plate (10) and a first push plate (9). The threaded column (7) and the rotating column (8) are both slidably connected to the generator housing (6). The power generation mechanism (5) also includes a rotating shaft (17) that rotates through the generator housing (6), and the rotating shaft (17) is fixedly connected to the second bevel gear (15). An oil storage block (29) is fixedly connected to the bottom of the rotating shaft (17). Multiple oil storage tanks (33) are provided at the bottom of the oil storage block (29), and multiple oil inlet holes (16) are provided on the side wall of the oil storage block (29). The multiple oil storage tanks (33) are connected to the inside of the generator housing (6) through different oil inlet holes (16). An arc plate (30) that is slidably connected to the side wall of the rotating shaft (17) is provided inside the generator housing (6). The generator housing (6) has a placement groove at the bottom, and the same oil storage pipe (18) is provided on the side wall and bottom of the generator housing (6). The placement groove is connected to the inner side wall of the generator housing (6) through the oil storage pipe (18) arranged in a C shape. A scraper (31) is slidably connected in the placement groove, and a third spring (32) is fixedly connected on the scraper (31). The third spring (32) is fixedly connected to the bottom of the placement groove. A nozzle is provided on the oil storage pipe (18). The oil storage tank (33) is arranged in a right-angled trapezoidal shape, and the top of the oil storage tank (33) is larger than the top of the scraper (31). The first oil inlet pipe (19) is provided through the side wall of the generator housing (6), and the first oil inlet pipe (19) is connected to the oil outlet pipe (238).

2. The offshore floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater according to claim 1, characterized in that: The breakwater (4) includes an outer shell that is fixedly connected to the side wall of the support platform (3). Multiple drainage holes (25) are provided on the inner side of the outer shell, and a baffle (20) is slidably connected on the outer side. Multiple grooves are provided on the baffle (20), and a first wave pusher (21) and a second wave pusher (22) are slidably connected in the multiple grooves respectively. A first damper (23) and a second damper (24) are fixedly connected on the baffle (20). The first damper (23) and the second damper (24) are both fixedly connected to the breakwater (4). The first wave pusher (21) and the second wave pusher (22) are connected to the outer shell through different buffer mechanisms.

3. The offshore floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater according to claim 2, characterized in that: The buffer mechanism includes a sliding groove (28) located on the inner wall of the outer shell. A sliding groove is provided in the sliding groove (28). A push rod (26) is slidably connected in the sliding groove. A second spring (27) is provided in the sliding groove. The two ends of the second spring (27) are fixedly connected to the push rod (26) and the sliding groove (28) respectively. Multiple push rods (26) are fixedly connected to the first wave-pushing plate (21) and the second wave-pushing plate (22) respectively. The push rod (26) slides through the baffle (20).

4. The offshore floating photovoltaic device with a porous, multi-stage attenuation wave energy breakwater according to claim 2, characterized in that: The first damper (23) includes a damper housing (231) fixedly connected to the baffle (20). A damper inner cylinder (233) is coaxially fixedly connected inside the damper housing (231). A plurality of through holes (236) are opened on the side wall of the damper inner cylinder (233). A damper push rod (232) is slidably connected inside the damper housing (231). The inner end of the damper push rod (232) is connected to a first spring (235) provided inside the damper inner cylinder (233) through a piston (234). A second oil inlet pipe (237) is provided on the side wall of the damper inner cylinder (233) that penetrates the side wall of the damper housing (231). An oil outlet pipe (238) in an L-shape is provided inside the second oil inlet pipe (237), and one end of the oil outlet pipe (238) penetrates the side wall of the second oil inlet pipe (237).

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